From patchwork Fri Dec 1 18:28:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476259 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="XUZmRF3I" Received: from mail-oo1-xc2a.google.com (mail-oo1-xc2a.google.com [IPv6:2607:f8b0:4864:20::c2a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A2B5C1 for ; Fri, 1 Dec 2023 10:29:09 -0800 (PST) Received: by mail-oo1-xc2a.google.com with SMTP id 006d021491bc7-58d06bfadf8so1453019eaf.1 for ; Fri, 01 Dec 2023 10:29:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455348; x=1702060148; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=diAiZXJXrWtDEzHUTXe1drJrCPu2AqgWIaD+9NvcbC0=; b=XUZmRF3IFtLvTTIPMLKSsDPC7vAnJRrBvct2hEHNZF6d+WXHKH6JiRRjOPq3OVh5J6 5a7ekuxp2fzVUGZzzK2tP3tCiCQ4MJP8b1JqZ0dqUSz/bK3ctb+xSKYQu/Wp30ZClVNa rdi3W01TIdJKKZ41+CmTLZwAOT/Kvk1uRHianM9Sadlft8R2QpJAY5m1rNWh0JNPDWvT FKeeohQclUltYwYT/Nga+Ih0xcnBbGvAUmbcORLNyBu9Dzb3IgL3anCkhugI9RvNLGFH Ui1C2DXQId8ibb0qp6UdKPzXEd3FmC4ekv0rgF9azA62KNTWIsl3V8vyDOrFKYfSS7qa lrxQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455348; x=1702060148; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=diAiZXJXrWtDEzHUTXe1drJrCPu2AqgWIaD+9NvcbC0=; b=VlGX/Hhen0eUaNiFnFxF4NeoradV5Mbty2HJSqtdXi10x/EXsbVYq1otV+Z/aA3Qft pmpL4yV5LE3emOk1+fQDqRQs6lzHnaLgXOoh7TZjW01e2PWcj46BOnAdbpoKmbOdally DPs19tKnJMzOPEBWa3k1BUnLEFSmrgYDtbpMHikOwUZo0bwUGgBBoTU+7DsUu+Bb3hl7 /PNH9Lm4iLokgYrQggK6YdpxunLuHvAngzPwRH8kaA8nCeNtj4Ob0Ac/sIfdyJ8Y4+sm M7d3npIG0HaHlINzEvcxCxRy33EeYjydufYxp9Ic3CWGy2q+QEio4hBHk/BDLT15qmc4 rCLw== X-Gm-Message-State: AOJu0YxIrvFj37qxDVi2qeyK2tSrDkJeG68jrGV4/jMmj5IRy2P9Lgfb r04Pa6Jv2vnXpbJAXdMy8peiTg== X-Google-Smtp-Source: AGHT+IE58B3ppgenxa9LHyxeEkWBC8bQrwRf7GB/VNFo6UaLELUvXnPzG/F6whsPLJEjwJlOSind0w== X-Received: by 2002:a05:6358:9217:b0:16f:ec86:698a with SMTP id d23-20020a056358921700b0016fec86698amr9954549rwb.9.1701455348222; Fri, 01 Dec 2023 10:29:08 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:07 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 01/15] net: sched: act_api: Introduce P4 actions list Date: Fri, 1 Dec 2023 13:28:50 -0500 Message-Id: <20231201182904.532825-2-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org In P4 we require to generate new actions "on the fly" based on the specified P4 action definition. P4 action kinds, like the pipeline they are attached to, must be per net namespace, as opposed to native action kinds which are global. For that reason, we chose to create a separate structure to store P4 actions. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Reviewed-by: Vlad Buslov --- include/net/act_api.h | 7 ++- net/sched/act_api.c | 123 +++++++++++++++++++++++++++++++++++++----- net/sched/cls_api.c | 2 +- 3 files changed, 115 insertions(+), 17 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index 4ae0580b6..bd50a50f4 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -105,6 +105,7 @@ typedef void (*tc_action_priv_destructor)(void *priv); struct tc_action_ops { struct list_head head; + struct list_head p4_head; char kind[IFNAMSIZ]; enum tca_id id; /* identifier should match kind */ unsigned int net_id; @@ -198,8 +199,10 @@ int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, int tcf_idr_release(struct tc_action *a, bool bind); int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); +int tcf_register_p4_action(struct net *net, struct tc_action_ops *act); int tcf_unregister_action(struct tc_action_ops *a, struct pernet_operations *ops); +void tcf_unregister_p4_action(struct net *net, struct tc_action_ops *act); int tcf_action_destroy(struct tc_action *actions[], int bind); int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions, int nr_actions, struct tcf_result *res); @@ -207,8 +210,8 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, struct nlattr *est, struct tc_action *actions[], int init_res[], size_t *attr_size, u32 flags, u32 fl_flags, struct netlink_ext_ack *extack); -struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, - bool rtnl_held, +struct tc_action_ops *tc_action_load_ops(struct net *net, struct nlattr *nla, + bool police, bool rtnl_held, struct netlink_ext_ack *extack); struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, struct nlattr *nla, struct nlattr *est, diff --git a/net/sched/act_api.c b/net/sched/act_api.c index c39252d61..52f6be39f 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -57,6 +57,40 @@ static void tcf_free_cookie_rcu(struct rcu_head *p) kfree(cookie); } +static unsigned int p4_act_net_id; + +struct tcf_p4_act_net { + struct list_head act_base; + rwlock_t act_mod_lock; +}; + +static __net_init int tcf_p4_act_base_init_net(struct net *net) +{ + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); + + INIT_LIST_HEAD(&p4_base_net->act_base); + rwlock_init(&p4_base_net->act_mod_lock); + + return 0; +} + +static void __net_exit tcf_p4_act_base_exit_net(struct net *net) +{ + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); + struct tc_action_ops *ops, *tmp; + + list_for_each_entry_safe(ops, tmp, &p4_base_net->act_base, p4_head) { + list_del(&ops->p4_head); + } +} + +static struct pernet_operations tcf_p4_act_base_net_ops = { + .init = tcf_p4_act_base_init_net, + .exit = tcf_p4_act_base_exit_net, + .id = &p4_act_net_id, + .size = sizeof(struct tc_action_ops), +}; + static void tcf_set_action_cookie(struct tc_cookie __rcu **old_cookie, struct tc_cookie *new_cookie) { @@ -941,6 +975,48 @@ static void tcf_pernet_del_id_list(unsigned int id) mutex_unlock(&act_id_mutex); } +static struct tc_action_ops *tc_lookup_p4_action(struct net *net, char *kind) +{ + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); + struct tc_action_ops *a, *res = NULL; + + read_lock(&p4_base_net->act_mod_lock); + list_for_each_entry(a, &p4_base_net->act_base, p4_head) { + if (strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) + res = a; + break; + } + } + read_unlock(&p4_base_net->act_mod_lock); + + return res; +} + +void tcf_unregister_p4_action(struct net *net, struct tc_action_ops *act) +{ + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); + + write_lock(&p4_base_net->act_mod_lock); + list_del(&act->p4_head); + write_unlock(&p4_base_net->act_mod_lock); +} +EXPORT_SYMBOL(tcf_unregister_p4_action); + +int tcf_register_p4_action(struct net *net, struct tc_action_ops *act) +{ + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); + + if (tc_lookup_p4_action(net, act->kind)) + return -EEXIST; + + write_lock(&p4_base_net->act_mod_lock); + list_add(&act->p4_head, &p4_base_net->act_base); + write_unlock(&p4_base_net->act_mod_lock); + + return 0; +} + int tcf_register_action(struct tc_action_ops *act, struct pernet_operations *ops) { @@ -1011,7 +1087,7 @@ int tcf_unregister_action(struct tc_action_ops *act, EXPORT_SYMBOL(tcf_unregister_action); /* lookup by name */ -static struct tc_action_ops *tc_lookup_action_n(char *kind) +static struct tc_action_ops *tc_lookup_action_n(struct net *net, char *kind) { struct tc_action_ops *a, *res = NULL; @@ -1019,31 +1095,48 @@ static struct tc_action_ops *tc_lookup_action_n(char *kind) read_lock(&act_mod_lock); list_for_each_entry(a, &act_base, head) { if (strcmp(kind, a->kind) == 0) { - if (try_module_get(a->owner)) - res = a; - break; + if (try_module_get(a->owner)) { + read_unlock(&act_mod_lock); + return a; + } } } read_unlock(&act_mod_lock); + + return tc_lookup_p4_action(net, kind); } + return res; } /* lookup by nlattr */ -static struct tc_action_ops *tc_lookup_action(struct nlattr *kind) +static struct tc_action_ops *tc_lookup_action(struct net *net, + struct nlattr *kind) { + struct tcf_p4_act_net *p4_base_net = net_generic(net, p4_act_net_id); struct tc_action_ops *a, *res = NULL; if (kind) { read_lock(&act_mod_lock); list_for_each_entry(a, &act_base, head) { + if (nla_strcmp(kind, a->kind) == 0) { + if (try_module_get(a->owner)) { + read_unlock(&act_mod_lock); + return a; + } + } + } + read_unlock(&act_mod_lock); + + read_lock(&p4_base_net->act_mod_lock); + list_for_each_entry(a, &p4_base_net->act_base, p4_head) { if (nla_strcmp(kind, a->kind) == 0) { if (try_module_get(a->owner)) res = a; break; } } - read_unlock(&act_mod_lock); + read_unlock(&p4_base_net->act_mod_lock); } return res; } @@ -1294,8 +1387,8 @@ void tcf_idr_insert_many(struct tc_action *actions[]) } } -struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, - bool rtnl_held, +struct tc_action_ops *tc_action_load_ops(struct net *net, struct nlattr *nla, + bool police, bool rtnl_held, struct netlink_ext_ack *extack) { struct nlattr *tb[TCA_ACT_MAX + 1]; @@ -1326,7 +1419,7 @@ struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, } } - a_o = tc_lookup_action_n(act_name); + a_o = tc_lookup_action_n(net, act_name); if (a_o == NULL) { #ifdef CONFIG_MODULES if (rtnl_held) @@ -1335,7 +1428,7 @@ struct tc_action_ops *tc_action_load_ops(struct nlattr *nla, bool police, if (rtnl_held) rtnl_lock(); - a_o = tc_lookup_action_n(act_name); + a_o = tc_lookup_action_n(net, act_name); /* We dropped the RTNL semaphore in order to * perform the module load. So, even if we @@ -1445,7 +1538,8 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) { struct tc_action_ops *a_o; - a_o = tc_action_load_ops(tb[i], flags & TCA_ACT_FLAGS_POLICE, + a_o = tc_action_load_ops(net, tb[i], + flags & TCA_ACT_FLAGS_POLICE, !(flags & TCA_ACT_FLAGS_NO_RTNL), extack); if (IS_ERR(a_o)) { @@ -1655,7 +1749,7 @@ static struct tc_action *tcf_action_get_1(struct net *net, struct nlattr *nla, index = nla_get_u32(tb[TCA_ACT_INDEX]); err = -EINVAL; - ops = tc_lookup_action(tb[TCA_ACT_KIND]); + ops = tc_lookup_action(net, tb[TCA_ACT_KIND]); if (!ops) { /* could happen in batch of actions */ NL_SET_ERR_MSG(extack, "Specified TC action kind not found"); goto err_out; @@ -1703,7 +1797,7 @@ static int tca_action_flush(struct net *net, struct nlattr *nla, err = -EINVAL; kind = tb[TCA_ACT_KIND]; - ops = tc_lookup_action(kind); + ops = tc_lookup_action(net, kind); if (!ops) { /*some idjot trying to flush unknown action */ NL_SET_ERR_MSG(extack, "Cannot flush unknown TC action"); goto err_out; @@ -2109,7 +2203,7 @@ static int tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb) return 0; } - a_o = tc_lookup_action(kind); + a_o = tc_lookup_action(net, kind); if (a_o == NULL) return 0; @@ -2176,6 +2270,7 @@ static int __init tc_action_init(void) rtnl_register(PF_UNSPEC, RTM_GETACTION, tc_ctl_action, tc_dump_action, 0); + register_pernet_subsys(&tcf_p4_act_base_net_ops); return 0; } diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 1976bd163..2db3c13c7 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -3293,7 +3293,7 @@ int tcf_exts_validate_ex(struct net *net, struct tcf_proto *tp, struct nlattr ** if (exts->police && tb[exts->police]) { struct tc_action_ops *a_o; - a_o = tc_action_load_ops(tb[exts->police], true, + a_o = tc_action_load_ops(net, tb[exts->police], true, !(flags & TCA_ACT_FLAGS_NO_RTNL), extack); if (IS_ERR(a_o)) From patchwork Fri Dec 1 18:28:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476261 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="DaXgKYL1" Received: from mail-qt1-x829.google.com (mail-qt1-x829.google.com [IPv6:2607:f8b0:4864:20::829]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6581106 for ; Fri, 1 Dec 2023 10:29:10 -0800 (PST) Received: by mail-qt1-x829.google.com with SMTP id d75a77b69052e-423ec1b2982so14961201cf.2 for ; Fri, 01 Dec 2023 10:29:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455350; x=1702060150; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=v5fUO27fPdxstwPfyvEmG4o87itC2tu7WDrjeySVB0k=; b=DaXgKYL1ir9S9oqWL2VrXxtIgYy1daalUGSOJFeXrV2SBobHZgqObbAKUJh5DRyzsF JwY/BCCnZSbb8jDzSK0wzaegxNugBRRtkAqACrFob2vUbsS6GyIcxQ08wSJ9TOcaYZJw tJVfweLw1zNxMYr9pCkm1n9LuqayORnoPU1LLHV9Rzmh74mJieF+th5CW939TkOHm97B 4IthnyrcysS7RQgF55k8I6K+1wj6Xaj/RBby1RCRSOnCwWIL9grgAyLG+tHpw0b+uS0d HdMznMKskDj1dB7DAY3CNVRq/j3Mvv13jYaOVAHTIZ3A0m3y6RX5lYDMJMlmJ+fjtKIp oMsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455350; x=1702060150; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=v5fUO27fPdxstwPfyvEmG4o87itC2tu7WDrjeySVB0k=; b=VqWW/8QWgORuWxjodmEMddvp56Xc/b4K8BWINDmiYmm/9/oQiz/4fAqSrKkDK0bDK0 D5Y4HrJ2Y/YoqbLeLJSJKreOPWVoGH9T9OTsKzXlI5a2Yal1bqKBWGoy4IYCbImi/p6E AFt++J4qsm+JsvYa3ouBlSQ3aj/ajkggTIyAFjYGs8P8Lc/hEcgnj+uWV0m/Y4mW2zx9 NwKjjGdckvAm+FWknWsfkeNxFsqifKuupiJVLjAkOMMkqHsC6CJ9Z8s8hyT3OtKQCPQi bL3wXHDqIY5dCZUok2KsgMQClLApnwX2hLXuLHalOy2g6aM1kPJ+De4F3QwTvV1bErgr Xxnw== X-Gm-Message-State: AOJu0YxX2h3RAsqG0a+Pkh0fE7UX8a/BW4MpiUvJyNnxJUSuos7mNfxp tfN1NF3TVWPtyjQlQKptNZnjzw== X-Google-Smtp-Source: AGHT+IGjQXsLnRybU7XC3viNzNk5RE7kyLSgv3rBEvJmCbT6riZspqJ/oGCcHycrCYQx9qvVwsfT5g== X-Received: by 2002:a0c:fd4c:0:b0:67a:6343:3049 with SMTP id j12-20020a0cfd4c000000b0067a63433049mr9943327qvs.45.1701455349789; Fri, 01 Dec 2023 10:29:09 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:09 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 02/15] net/sched: act_api: increase action kind string length Date: Fri, 1 Dec 2023 13:28:51 -0500 Message-Id: <20231201182904.532825-3-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Increase action kind string length from IFNAMSIZ to 64 The new P4 actions, created via templates, will have longer names of format: "pipeline_name/act_name". IFNAMSIZ is currently 16 and is most of the times undersized for the above format. So, to conform to this new format, we increase the maximum name length to account for this extra string (pipeline name) and the '/' character. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Reviewed-by: Vlad Buslov --- include/net/act_api.h | 2 +- include/uapi/linux/pkt_cls.h | 1 + net/sched/act_api.c | 6 +++--- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index bd50a50f4..4bccc9c59 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -106,7 +106,7 @@ typedef void (*tc_action_priv_destructor)(void *priv); struct tc_action_ops { struct list_head head; struct list_head p4_head; - char kind[IFNAMSIZ]; + char kind[ACTNAMSIZ]; enum tca_id id; /* identifier should match kind */ unsigned int net_id; size_t size; diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h index c7082cc60..75bf73742 100644 --- a/include/uapi/linux/pkt_cls.h +++ b/include/uapi/linux/pkt_cls.h @@ -6,6 +6,7 @@ #include #define TC_COOKIE_MAX_SIZE 16 +#define ACTNAMSIZ 64 /* Action attributes */ enum { diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 52f6be39f..e6792495e 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -476,7 +476,7 @@ static size_t tcf_action_shared_attrs_size(const struct tc_action *act) rcu_read_unlock(); return nla_total_size(0) /* action number nested */ - + nla_total_size(IFNAMSIZ) /* TCA_ACT_KIND */ + + nla_total_size(ACTNAMSIZ) /* TCA_ACT_KIND */ + cookie_len /* TCA_ACT_COOKIE */ + nla_total_size(sizeof(struct nla_bitfield32)) /* TCA_ACT_HW_STATS */ + nla_total_size(0) /* TCA_ACT_STATS nested */ @@ -1393,7 +1393,7 @@ struct tc_action_ops *tc_action_load_ops(struct net *net, struct nlattr *nla, { struct nlattr *tb[TCA_ACT_MAX + 1]; struct tc_action_ops *a_o; - char act_name[IFNAMSIZ]; + char act_name[ACTNAMSIZ]; struct nlattr *kind; int err; @@ -1408,7 +1408,7 @@ struct tc_action_ops *tc_action_load_ops(struct net *net, struct nlattr *nla, NL_SET_ERR_MSG(extack, "TC action kind must be specified"); return ERR_PTR(err); } - if (nla_strscpy(act_name, kind, IFNAMSIZ) < 0) { + if (nla_strscpy(act_name, kind, ACTNAMSIZ) < 0) { NL_SET_ERR_MSG(extack, "TC action name too long"); return ERR_PTR(err); } From patchwork Fri Dec 1 18:28:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476262 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="UA8VG79G" Received: from mail-oo1-xc30.google.com (mail-oo1-xc30.google.com [IPv6:2607:f8b0:4864:20::c30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2640193 for ; Fri, 1 Dec 2023 10:29:11 -0800 (PST) Received: by mail-oo1-xc30.google.com with SMTP id 006d021491bc7-58cdc801f69so1446040eaf.3 for ; Fri, 01 Dec 2023 10:29:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455351; x=1702060151; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=i7sOjzOE8nfzRaYjLNL4s14LmsOqYy+4iQOHktEsKVU=; b=UA8VG79GVAL1LqaVxIoUB0jhaU8ZFwNgnJ8t71dTDaTtfcgh9nNV27sP8dOnBYmfvt lcvm2PfABetsH6lUNP8idLxbsfHPW83KF6Lv3ofUrGpEuYsM1OeUesGClGkLVnIxhk+C T6+oRaG4XMceFoYU1zua7gVu7W25Vf9ofrhO3HDceoPR9Lu5jrFbrcPzDTKsM+jZlZNW +8EDyU/hhhV3KecHFwx/i5r+duMY6XHqA6fmO+Or5pcYPih4Qt4PBFqvNKvZiRzxUe6K Ne64ceZsCuX+7ton3SOpc6lZ010KMY52Y4OtwfBQOz7gF6gxrQSVmq0BF31iP9KdMDMa anXw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455351; x=1702060151; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=i7sOjzOE8nfzRaYjLNL4s14LmsOqYy+4iQOHktEsKVU=; b=YvGqxtGyhe28BZP/0+xTfHPNUWVuN/wjw0CGd+asdHdT/gpsxdveETs7xMNFRPoJIJ mUsaYT8gNj6kJc+I+NmIwtF69etUCw85jS8bY+os20ydzf8tFwTswE4Qw/AFNooC8ZUe 9r1y4gZiw34AfSAR0HJflR8Pnej1DJQVvvI0LuRSMZqEeNr6HnLExBtVpOpVGkttZ/Bn O85nwypiJeBJ4O4q4SU8Zi+4GgcEDRaDwjHsXb+UxOkinz7oOqDHL/k88E6GX4tD95n+ ddk8xgBxWWknUalJAHe7+VsM/4reOVs9cwmRMMifrTIh3TNy1o62rmqnmPB0TCj4WZPa kzvw== X-Gm-Message-State: AOJu0Yy+lymgfjMEb2UMQGJh1P0nop1Jjzk816Knu2NE18CTxPXyCqnr R1QCH+7ABEM9Q4AbKWrLVSBVuA== X-Google-Smtp-Source: AGHT+IH+9qhFhPnRpPwoOBwgU6EtmVVTVJtMmhXl5aVpIbmcuQQ48AsrsJjd93Fg3cUBQoiZKxGFsw== X-Received: by 2002:a05:6358:260c:b0:16d:edaa:921c with SMTP id l12-20020a056358260c00b0016dedaa921cmr28798999rwc.12.1701455351089; Fri, 01 Dec 2023 10:29:11 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:10 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 03/15] net/sched: act_api: Update tc_action_ops to account for P4 actions Date: Fri, 1 Dec 2023 13:28:52 -0500 Message-Id: <20231201182904.532825-4-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org The initialisation of P4TC action instances require access to a struct p4tc_act (which appears in later patches) to help us to retrieve information like the P4 action parameters etc. In order to retrieve struct p4tc_act we need the pipeline name or id and the action name or id. Also recall that P4TC action IDs are P4 and are net namespace specific. The init callback from tc_action_ops parameters had no way of supplying us that information. To solve this issue, we decided to create a new tc_action_ops callback (init_ops), that provies us with the tc_action_ops struct which then provides us with the pipeline and action name. In addition we add a new refcount to struct tc_action_ops called dyn_ref, which accounts for how many action instances we have of a specific action. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Reviewed-by: Vlad Buslov --- include/net/act_api.h | 6 ++++++ net/sched/act_api.c | 14 +++++++++++--- 2 files changed, 17 insertions(+), 3 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index 4bccc9c59..baba63d02 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -109,6 +109,7 @@ struct tc_action_ops { char kind[ACTNAMSIZ]; enum tca_id id; /* identifier should match kind */ unsigned int net_id; + refcount_t p4_ref; size_t size; struct module *owner; int (*act)(struct sk_buff *, const struct tc_action *, @@ -120,6 +121,11 @@ struct tc_action_ops { struct nlattr *est, struct tc_action **act, struct tcf_proto *tp, u32 flags, struct netlink_ext_ack *extack); + /* This should be merged with the original init action */ + int (*init_ops)(struct net *net, struct nlattr *nla, + struct nlattr *est, struct tc_action **act, + struct tcf_proto *tp, struct tc_action_ops *ops, + u32 flags, struct netlink_ext_ack *extack); int (*walk)(struct net *, struct sk_buff *, struct netlink_callback *, int, const struct tc_action_ops *, diff --git a/net/sched/act_api.c b/net/sched/act_api.c index e6792495e..5ab1c75ce 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -1023,7 +1023,7 @@ int tcf_register_action(struct tc_action_ops *act, struct tc_action_ops *a; int ret; - if (!act->act || !act->dump || !act->init) + if (!act->act || !act->dump || (!act->init && !act->init_ops)) return -EINVAL; /* We have to register pernet ops before making the action ops visible, @@ -1484,8 +1484,16 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, } } - err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, - userflags.value | flags, extack); + /* When we arrive here we guarantee that a_o->init or + * a_o->init_ops exist. + */ + if (a_o->init) + err = a_o->init(net, tb[TCA_ACT_OPTIONS], est, &a, tp, + userflags.value | flags, extack); + else + err = a_o->init_ops(net, tb[TCA_ACT_OPTIONS], est, &a, + tp, a_o, userflags.value | flags, + extack); } else { err = a_o->init(net, nla, est, &a, tp, userflags.value | flags, extack); From patchwork Fri Dec 1 18:28:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476263 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="sIsZcRA+" Received: from mail-oo1-xc32.google.com (mail-oo1-xc32.google.com [IPv6:2607:f8b0:4864:20::c32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35814129 for ; Fri, 1 Dec 2023 10:29:13 -0800 (PST) Received: by mail-oo1-xc32.google.com with SMTP id 006d021491bc7-58de42d0ff7so1319391eaf.0 for ; Fri, 01 Dec 2023 10:29:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455352; x=1702060152; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=5/QxvUzYS1W8RYq6mM2bceYbwgM8SdKWnwgWEo++oLE=; b=sIsZcRA+fOkg14GK2PlkHx8+ztoJDFAFjPe/+KPW+oJ1aNTrjWfPt0ISlg7K0mb4ZA Olhlc99HZjbQ1Kr/vCNzS9EUUAa/qgI24jHl+qG2sO2OYmznBu7JQ434+F27XuMI+UnN D1HJBFwS5LfIDE/ZCXZQRGGcFqqHCsrZ4Tg942LN4VQo/svLpAd90pVuH/1DokSRIRR9 0z+2+Waqlio17xv1iCPE/RSrFexc0vamTi+wPq1JzBeOpKxgu57TnDEVWrH/Y++z68D5 6eL5FzfqpI3Cojc5W+uR1YoWRknOgc7kh6vDrqxtO340k3O5kLHg62g6lQNwHWcp0TkD R52A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455352; x=1702060152; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=5/QxvUzYS1W8RYq6mM2bceYbwgM8SdKWnwgWEo++oLE=; b=ZoNRxtsS0oykn+gHyyjTi0ghrNgcTpe5oLRjtGDuF04HnRxAqegd5CgpJXi6rWYUOr VJYYLVBLkqd9TFOr7sUg+EA4gGC5xISPM5VQ8e9xNo2Dc3DGwzxqIL2ScZ8V70/5pFFR H6FYvvvCvO1nsQAjLc95OUy/smsIkLsg0u4HU5AXLxeOFFby5p7VxOR7L535dR5EAnGS nbMyK6D55UMlp4nsuZOT8/mhxfM7q2Qkt+DZfHYbQU4fjlLz7brgr4tR6dAPJjqqdA54 239mmNF+TOSHUh3dzPRoZPpbaTpJahnWnMUr3qzV9Se2f0a961W87jCjfu0ejG4eXMWg vONw== X-Gm-Message-State: AOJu0YwYNTztlQe2Rpg4cdKGXBB5p5lNj1GmL9evLmxEK0v3yjXN6H2a lqciTcAAobJDqjwiDL6BzRhsQQ== X-Google-Smtp-Source: AGHT+IGg5LOeHL7X7aynu+Wi3/58B0QLIG/KMb/snNl3J9F6+yAQa9qW+6MnCuabOPOktO255SARSQ== X-Received: by 2002:a05:6358:33a6:b0:16d:e151:a7d8 with SMTP id i38-20020a05635833a600b0016de151a7d8mr29676214rwd.14.1701455352433; Fri, 01 Dec 2023 10:29:12 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:11 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 04/15] net/sched: act_api: add struct p4tc_action_ops as a parameter to lookup callback Date: Fri, 1 Dec 2023 13:28:53 -0500 Message-Id: <20231201182904.532825-5-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org For P4 actions, we require information from struct tc_action_ops, specifically the action kind, to find and locate the P4 action information for the lookup operation. Signed-off-by: Victor Nogueira Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Reviewed-by: Vlad Buslov --- include/net/act_api.h | 3 ++- net/sched/act_api.c | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index baba63d02..c59bc8053 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -116,7 +116,8 @@ struct tc_action_ops { struct tcf_result *); /* called under RCU BH lock*/ int (*dump)(struct sk_buff *, struct tc_action *, int, int); void (*cleanup)(struct tc_action *); - int (*lookup)(struct net *net, struct tc_action **a, u32 index); + int (*lookup)(struct net *net, const struct tc_action_ops *ops, + struct tc_action **a, u32 index); int (*init)(struct net *net, struct nlattr *nla, struct nlattr *est, struct tc_action **act, struct tcf_proto *tp, diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 5ab1c75ce..ddef91233 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -726,7 +726,7 @@ static int __tcf_idr_search(struct net *net, struct tc_action_net *tn = net_generic(net, ops->net_id); if (unlikely(ops->lookup)) - return ops->lookup(net, a, index); + return ops->lookup(net, ops, a, index); return tcf_idr_search(tn, a, index); } From patchwork Fri Dec 1 18:28:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476264 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="fTdZ7/GC" Received: from mail-oo1-xc36.google.com (mail-oo1-xc36.google.com [IPv6:2607:f8b0:4864:20::c36]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B778119F for ; Fri, 1 Dec 2023 10:29:14 -0800 (PST) Received: by mail-oo1-xc36.google.com with SMTP id 006d021491bc7-58d08497aa1so1458042eaf.0 for ; Fri, 01 Dec 2023 10:29:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455354; x=1702060154; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=a+1B6MS9WebvTIJbkdAm0FmoVBlDA/Si6pEiGwF7JXk=; b=fTdZ7/GCWz9+qes5hqoCevRC5orCHLqE8TKLsmmHf088A2q2hhZjXNV8m1vARku27X OE37W1qP89ONqmcXuFSwzSOu8U1JjE3jhVvMZBFb3YAWMhjQyEIrZ7invuODZMBjyWy/ X7fdF3tKAaU/YAwizoDqeYTTO9+XPP2xetCXsbAFSk1MPut4f2YL/WhBYBrBWWVokewu vuwTVyhpKvC4oVIJZf/MLEmmLSdd7C6gLt6o3Lh7i5dByFPmkTegEbmcKlL9HLNk+9kG u7wJZads5XR7+CnzvO0dUFbqBejHZf//UAjHpQlOPXGJBg6SBEOLi+PlLrx+ZeQROtc2 KOgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455354; x=1702060154; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=a+1B6MS9WebvTIJbkdAm0FmoVBlDA/Si6pEiGwF7JXk=; b=Cs/QhSlUvoOxQga4MwPCfhj92EHnkF+aV4hdlUjVK/WLbK1w1HG/8+ruWk+EGTKC0w zh2Zycf48N7SZHE9WBWqfqIHBCn90po9j53P1/Cr29m3csX/fPvjOoCjX3VHXpy61NVe 0oIJFDc2Pp3Ga9T8YwyJ71agugnp7YjXs/377MIYj3enfy0hxsF+t00k11ypXpOomkyP NTTMkXdJ95b1iAGG0uw5q8r85hQ0xXTGZxK7FbT/6+XnEM27q7XKCxJz1RIN8QavuD8p 9OC5rCUoABDqKr5pku2VL9fqBdwIO5Q+gNpMq3tNJJkpcZaV8kQl7Vp/VsVlmNJAGyvY FefA== X-Gm-Message-State: AOJu0Yy+4RlPQBOPPTHwLmfy/uZlByCltGft3VQJNt+1LKFEzl1DT77l 6b8CFg4vvdJ7fzb4egAuicJV+Q== X-Google-Smtp-Source: AGHT+IHJP1iKSAf41dxOeNUaFER1qHT/ZePiI0qB9R9+A4Gmvvh4LflG14Xv1E4aiNIk4oAIF45u6Q== X-Received: by 2002:a05:6358:6f8a:b0:16e:3803:9cf8 with SMTP id s10-20020a0563586f8a00b0016e38039cf8mr22601805rwn.24.1701455353897; Fri, 01 Dec 2023 10:29:13 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:13 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 05/15] net: sched: act_api: Add support for preallocated P4 action instances Date: Fri, 1 Dec 2023 13:28:54 -0500 Message-Id: <20231201182904.532825-6-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org In P4, actions are assumed to pre exist and have an upper bound number of instances. Typically if you have 1M table entries you want to allocate enough action instances to cover the 1M entries. However, this is a big waste of memory if the action instances are not in use. So for our case, we allow the user to specify a minimal amount of actions in the template and then if more P4 action instances are needed then they will be added on demand as in the current approach with tc filter-action relationship. Add the necessary code to preallocate actions instances for P4 actions. We add 2 new actions flags: - TCA_ACT_FLAGS_PREALLOC: Indicates the action instance is a P4 action and was preallocated for future use the templating phase of P4TC - TCA_ACT_FLAGS_UNREFERENCED: Indicates the action instance was preallocated and is currently not being referenced by any other object. Which means it won't show up in an action instance dump. Once an action instance is created we don't free it when the last table entry referring to it is deleted. Instead we add it to the pool/cache of action instances for that specific action i.e it counts as if it is preallocated. Preallocated actions can't be deleted by the tc actions runtime commands and a dump or a get will only show preallocated actions instances which are being used (TCA_ACT_FLAGS_UNREFERENCED == false). The preallocated actions will be deleted once the pipeline is deleted (which will purge the P4 action kind and its instances). For example, if we were to create a P4 action that preallocates 128 elements and dumped: $ tc -j p4template get action/myprog/send_nh | jq . We'd see the following: [ { "obj": "action template", "pname": "myprog", "pipeid": 1 }, { "templates": [ { "aname": "myprog/send_nh", "actid": 1, "params": [ { "name": "port", "type": "dev", "id": 1 } ], "prealloc": 128 } ] } ] If we try to dump the P4 action instances, we won't see any: $ tc -j actions ls action myprog/send_nh | jq . [] However, if we create a table entry which references this action kind: $ tc p4ctrl create myprog/table/cb/FDB \ dstAddr d2:96:91:5d:02:86 action myprog/send_nh \ param port type dev dummy0 Dumping the action instance will now show this one instance which is associated with the table entry: $ tc -j actions ls action myprog/send_nh | jq . [ { "total acts": 1 }, { "actions": [ { "order": 0, "kind": "myprog/send_nh", "index": 1, "ref": 1, "bind": 1, "params": [ { "name": "port", "type": "dev", "value": "dummy0", "id": 1 } ], "not_in_hw": true } ] } ] Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Reviewed-by: Vlad Buslov --- include/net/act_api.h | 3 +++ net/sched/act_api.c | 50 ++++++++++++++++++++++++++++++++----------- 2 files changed, 41 insertions(+), 12 deletions(-) diff --git a/include/net/act_api.h b/include/net/act_api.h index c59bc8053..4b719da7d 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -68,6 +68,8 @@ struct tc_action { #define TCA_ACT_FLAGS_REPLACE (1U << (TCA_ACT_FLAGS_USER_BITS + 2)) #define TCA_ACT_FLAGS_NO_RTNL (1U << (TCA_ACT_FLAGS_USER_BITS + 3)) #define TCA_ACT_FLAGS_AT_INGRESS (1U << (TCA_ACT_FLAGS_USER_BITS + 4)) +#define TCA_ACT_FLAGS_PREALLOC (1U << (TCA_ACT_FLAGS_USER_BITS + 5)) +#define TCA_ACT_FLAGS_UNREFERENCED (1U << (TCA_ACT_FLAGS_USER_BITS + 6)) /* Update lastuse only if needed, to avoid dirtying a cache line. * We use a temp variable to avoid fetching jiffies twice. @@ -200,6 +202,7 @@ int tcf_idr_create_from_flags(struct tc_action_net *tn, u32 index, const struct tc_action_ops *ops, int bind, u32 flags); void tcf_idr_insert_many(struct tc_action *actions[]); +void tcf_idr_insert_n(struct tc_action *actions[], const u32 n); void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, struct tc_action **a, int bind); diff --git a/net/sched/act_api.c b/net/sched/act_api.c index ddef91233..9facdd46a 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -560,6 +560,8 @@ static int tcf_dump_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, continue; if (IS_ERR(p)) continue; + if (p->tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) + continue; if (jiffy_since && time_after(jiffy_since, @@ -640,6 +642,9 @@ static int tcf_del_walker(struct tcf_idrinfo *idrinfo, struct sk_buff *skb, idr_for_each_entry_ul(idr, p, tmp, id) { if (IS_ERR(p)) continue; + if (p->tcfa_flags & TCA_ACT_FLAGS_PREALLOC) + continue; + ret = tcf_idr_release_unsafe(p); if (ret == ACT_P_DELETED) module_put(ops->owner); @@ -1367,26 +1372,38 @@ static const struct nla_policy tcf_action_policy[TCA_ACT_MAX + 1] = { [TCA_ACT_HW_STATS] = NLA_POLICY_BITFIELD32(TCA_ACT_HW_STATS_ANY), }; +static void tcf_idr_insert_1(struct tc_action *a) +{ + struct tcf_idrinfo *idrinfo; + + idrinfo = a->idrinfo; + mutex_lock(&idrinfo->lock); + /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if + * it is just created, otherwise this is just a nop. + */ + idr_replace(&idrinfo->action_idr, a, a->tcfa_index); + mutex_unlock(&idrinfo->lock); +} + void tcf_idr_insert_many(struct tc_action *actions[]) { int i; for (i = 0; i < TCA_ACT_MAX_PRIO; i++) { - struct tc_action *a = actions[i]; - struct tcf_idrinfo *idrinfo; - - if (!a) + if (!actions[i]) continue; - idrinfo = a->idrinfo; - mutex_lock(&idrinfo->lock); - /* Replace ERR_PTR(-EBUSY) allocated by tcf_idr_check_alloc if - * it is just created, otherwise this is just a nop. - */ - idr_replace(&idrinfo->action_idr, a, a->tcfa_index); - mutex_unlock(&idrinfo->lock); + tcf_idr_insert_1(actions[i]); } } +void tcf_idr_insert_n(struct tc_action *actions[], const u32 n) +{ + int i; + + for (i = 0; i < n; i++) + tcf_idr_insert_1(actions[i]); +} + struct tc_action_ops *tc_action_load_ops(struct net *net, struct nlattr *nla, bool police, bool rtnl_held, struct netlink_ext_ack *extack) @@ -2033,8 +2050,17 @@ tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n, ret = PTR_ERR(act); goto err; } - attr_size += tcf_action_fill_size(act); actions[i - 1] = act; + + if (event == RTM_DELACTION && + act->tcfa_flags & TCA_ACT_FLAGS_PREALLOC) { + ret = -EINVAL; + NL_SET_ERR_MSG_FMT(extack, + "Unable to delete preallocated action %s", + act->ops->kind); + goto err; + } + attr_size += tcf_action_fill_size(act); } attr_size = tcf_action_full_attrs_size(attr_size); From patchwork Fri Dec 1 18:28:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476265 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="Plrq2LPG" Received: from mail-qk1-x72d.google.com (mail-qk1-x72d.google.com [IPv6:2607:f8b0:4864:20::72d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 247D5193 for ; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:14 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 06/15] net: introduce rcu_replace_pointer_rtnl Date: Fri, 1 Dec 2023 13:28:55 -0500 Message-Id: <20231201182904.532825-7-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org We use rcu_replace_pointer(rcu_ptr, ptr, lockdep_rtnl_is_held()) throughout the P4TC infrastructure code. It may be useful for other use cases, so we create a helper. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/linux/rtnetlink.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 3d6cf306c..971055e66 100644 --- a/include/linux/rtnetlink.h +++ b/include/linux/rtnetlink.h @@ -62,6 +62,18 @@ static inline bool lockdep_rtnl_is_held(void) #define rcu_dereference_rtnl(p) \ rcu_dereference_check(p, lockdep_rtnl_is_held()) +/** + * rcu_replace_pointer_rtnl - replace an RCU pointer under rtnl_lock, returning + * its old value + * @rcu_ptr: RCU pointer, whose old value is returned + * @ptr: regular pointer + * + * Perform a replacement under rtnl_lock, where @rcu_ptr is an RCU-annotated + * pointer. 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:16 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 07/15] rtnl: add helper to check if group has listeners Date: Fri, 1 Dec 2023 13:28:56 -0500 Message-Id: <20231201182904.532825-8-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org As of today, rtnl code creates a new skb and unconditionally fills and broadcasts it to the relevant group. For most operations this is okay and doesn't waste resources in general. For P4TC, it's interesting to know if the TC group has any listeners when adding/updating/deleting table entries as we can optimize for the most likely case it contains none. This not only improves our processing speed, it also reduces pressure on the system memory as we completely avoid the broadcast skb allocation. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/linux/rtnetlink.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 971055e66..487e45f8a 100644 --- a/include/linux/rtnetlink.h +++ b/include/linux/rtnetlink.h @@ -142,4 +142,11 @@ extern int ndo_dflt_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq, extern void rtnl_offload_xstats_notify(struct net_device *dev); +static inline int rtnl_has_listeners(const struct net *net, u32 group) +{ + struct sock *rtnl = net->rtnl; + + return netlink_has_listeners(rtnl, group); +} + #endif /* __LINUX_RTNETLINK_H */ From patchwork Fri Dec 1 18:28:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476267 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="ngpofFPA" Received: from mail-qv1-xf29.google.com (mail-qv1-xf29.google.com [IPv6:2607:f8b0:4864:20::f29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40DDAC1 for ; Fri, 1 Dec 2023 10:29:19 -0800 (PST) Received: by mail-qv1-xf29.google.com with SMTP id 6a1803df08f44-67a934a5b7eso6608616d6.3 for ; Fri, 01 Dec 2023 10:29:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20230601.gappssmtp.com; s=20230601; t=1701455358; x=1702060158; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=v+hq5yl3cLs/HunmqAB9aUDW/EYM+nteqp/0SFoxihA=; b=ngpofFPANcZfzy4584lB5ro05bKF6JK10dnDMjJRQu3N0dSqvn782fqGoL9aHdM/IE TO+JbsAsUOlZ6xNs5oMJSK1L2PRoOLi/VNt4Z9t7D2YTOd5twe5CtWpOmeAQr14WVSWR 9gVGJUrRahwDB9hYPEjvaR6VHhtw8EKvP0eoTVUm3jluwPFhL5uw9OJSIh29zybdMqKI jZIkUBqtJ8445yVhLgMS7EVwbIVY7a8fBGQp/8XgDH7U+r0mAcmExcBpKXl+JbI/2c8F uuWMH2Ov54UlAWaH9PcfeiHVRQVbmSUT3ujuDkj8CYUmkiAIky2CBFFUo4f0x9QA6yDd KRkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701455358; x=1702060158; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=v+hq5yl3cLs/HunmqAB9aUDW/EYM+nteqp/0SFoxihA=; b=Pe7rrCShqx9yihH2jksLwnRNPYSPcGJ+bognB1aOwzQ4GKIR0K6mcYrwfM/ylFy8Z/ f2H0+ThK0WnRA20cRurwtVv5i8Ns33ORqGuxBzenFg5ZkNYAVDuE2zI9ierZAO/jR3QF pV2+3C2RkYYVuS1k+vvejUzl3+9Dewnk1X/oORB8YwbkeQriHdFyK433uxH8w0tuuTbt 7M05BKzgb9gb3VCB1ABywQFpk9SpQfKPZMc5bvZrbNAD9xwi1yhfGw+haGHl9+4Ub6H9 b63H0uXOcyH+RKLElFbv4xtfSFK16uSyU5i0NTBjUr92BwHSmGZYBrBKa+ftK+HYSp8h H5HA== X-Gm-Message-State: AOJu0YwQvG5BPSavhaAsRluVlh1VJqkGT0QhxUzzARJyBtqiMVVJj5Qn 0m2RzZ/rjE986e+DFScnyEN6kQ== X-Google-Smtp-Source: AGHT+IFEFBrALBIUDSQvwXaKG45CeplVFpz1ZbYsRkR8k85/IrivfQ8bc8ZPPK0k4Y+XDCIKMFA/Qw== X-Received: by 2002:a05:6214:8ea:b0:675:3fed:ed with SMTP id dr10-20020a05621408ea00b006753fed00edmr27040494qvb.44.1701455358187; Fri, 01 Dec 2023 10:29:18 -0800 (PST) Received: from majuu.waya (bras-base-kntaon1618w-grc-15-174-91-6-24.dsl.bell.ca. [174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:17 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 08/15] p4tc: add P4 data types Date: Fri, 1 Dec 2023 13:28:57 -0500 Message-Id: <20231201182904.532825-9-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Introduce abstraction that represents P4 data types. This also introduces the Kconfig and Makefile which later patches use. Types could be little, host or big endian definitions. The abstraction also supports defining: a) bitstrings using P4 annotations that look like "bit" where X is the number of bits defined in a type b) bitslices such that one can define in P4 as bit<8>[0-3] and bit<16>[4-9]. A 4-bit slice from bits 0-3 and a 6-bit slice from bits 4-9 respectively. Each type has a bitsize, a name (for debugging purposes), an ID and methods/ops. The P4 types will be used by externs, dynamic actions, packet headers and other parts of P4TC. Each type has four ops: - validate_p4t: Which validates if a given value of a specific type meets valid boundary conditions. - create_bitops: Which, given a bitsize, bitstart and bitend allocates and returns a mask and a shift value. For example, if we have type bit<8>[3-3] meaning bitstart = 3 and bitend = 3, we'll create a mask which would only give us the fourth bit of a bit8 value, that is, 0x08. Since we are interested in the fourth bit, the bit shift value will be 3. This is also useful if an "irregular" bitsize is used, for example, bit24. In that case bitstart = 0 and bitend = 23. Shift will be 0 and the mask will be 0xFFFFFF00 if the machine is big endian. - host_read : Which reads the value of a given type and transforms it to host order (if needed) - host_write : Which writes a provided host order value and transforms it to the type's native order (if needed) Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/p4tc_types.h | 88 +++ include/uapi/linux/p4tc.h | 33 + net/sched/Kconfig | 11 + net/sched/Makefile | 2 + net/sched/p4tc/Makefile | 3 + net/sched/p4tc/p4tc_types.c | 1247 +++++++++++++++++++++++++++++++++++ 6 files changed, 1384 insertions(+) create mode 100644 include/net/p4tc_types.h create mode 100644 include/uapi/linux/p4tc.h create mode 100644 net/sched/p4tc/Makefile create mode 100644 net/sched/p4tc/p4tc_types.c diff --git a/include/net/p4tc_types.h b/include/net/p4tc_types.h new file mode 100644 index 000000000..6cba34e36 --- /dev/null +++ b/include/net/p4tc_types.h @@ -0,0 +1,88 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_P4TYPES_H +#define __NET_P4TYPES_H + +#include +#include +#include + +#include + +#define P4TC_T_MAX_BITSZ 128 + +struct p4tc_type_mask_shift { + void *mask; + u8 shift; +}; + +struct p4tc_type; +struct p4tc_type_ops { + int (*validate_p4t)(struct p4tc_type *container, void *value, u16 startbit, + u16 endbit, struct netlink_ext_ack *extack); + struct p4tc_type_mask_shift *(*create_bitops)(u16 bitsz, + u16 bitstart, + u16 bitend, + struct netlink_ext_ack *extack); + void (*host_read)(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval); + void (*host_write)(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval); + void (*print)(struct net *net, struct p4tc_type *container, + const char *prefix, void *val); +}; + +#define P4TC_T_MAX_STR_SZ 32 +struct p4tc_type { + char name[P4TC_T_MAX_STR_SZ]; + const struct p4tc_type_ops *ops; + size_t container_bitsz; + size_t bitsz; + int typeid; +}; + +struct p4tc_type *p4type_find_byid(int id); +bool p4tc_is_type_unsigned(int typeid); + +void p4t_copy(struct p4tc_type_mask_shift *dst_mask_shift, + struct p4tc_type *dst_t, void *dstv, + struct p4tc_type_mask_shift *src_mask_shift, + struct p4tc_type *src_t, void *srcv); +int p4t_cmp(struct p4tc_type_mask_shift *dst_mask_shift, + struct p4tc_type *dst_t, void *dstv, + struct p4tc_type_mask_shift *src_mask_shift, + struct p4tc_type *src_t, void *srcv); +void p4t_release(struct p4tc_type_mask_shift *mask_shift); + +int p4tc_register_types(void); +void p4tc_unregister_types(void); + +#ifdef CONFIG_RETPOLINE +void __p4tc_type_host_read(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval); +void __p4tc_type_host_write(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval); +#else +static inline void __p4tc_type_host_read(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, + void *sval, void *dval) +{ + return ops->host_read(container, mask_shift, sval, dval); +} + +static inline void __p4tc_type_host_write(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, + void *sval, void *dval) +{ + return ops->host_write(container, mask_shift, sval, dval); +} +#endif + +#endif diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h new file mode 100644 index 000000000..0133947c5 --- /dev/null +++ b/include/uapi/linux/p4tc.h @@ -0,0 +1,33 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef __LINUX_P4TC_H +#define __LINUX_P4TC_H + +#define P4TC_MAX_KEYSZ 512 + +enum { + P4TC_T_UNSPEC, + P4TC_T_U8, + P4TC_T_U16, + P4TC_T_U32, + P4TC_T_U64, + P4TC_T_STRING, + P4TC_T_S8, + P4TC_T_S16, + P4TC_T_S32, + P4TC_T_S64, + P4TC_T_MACADDR, + P4TC_T_IPV4ADDR, + P4TC_T_BE16, + P4TC_T_BE32, + P4TC_T_BE64, + P4TC_T_U128, + P4TC_T_S128, + P4TC_T_BOOL, + P4TC_T_DEV, + P4TC_T_KEY, + __P4TC_T_MAX, +}; + +#define P4TC_T_MAX (__P4TC_T_MAX - 1) + +#endif diff --git a/net/sched/Kconfig b/net/sched/Kconfig index 470c70def..df6d5e15f 100644 --- a/net/sched/Kconfig +++ b/net/sched/Kconfig @@ -675,6 +675,17 @@ config NET_EMATCH_IPT To compile this code as a module, choose M here: the module will be called em_ipt. +config NET_P4_TC + bool "P4 TC support" + select NET_CLS_ACT + help + Say Y here if you want to use P4 features on top of TC. + P4 is an open source, domain-specific programming language for + specifying data plane behavior. By enabling P4TC you will be able to + write a P4 program, use a P4 compiler that supports P4TC backend to + generate all needed artificats, which when loaded allow you to + introduce a new kernel datapath that can be controlled via TC. + config NET_CLS_ACT bool "Actions" select NET_CLS diff --git a/net/sched/Makefile b/net/sched/Makefile index b5fd49641..937b8f8a9 100644 --- a/net/sched/Makefile +++ b/net/sched/Makefile @@ -82,3 +82,5 @@ obj-$(CONFIG_NET_EMATCH_TEXT) += em_text.o obj-$(CONFIG_NET_EMATCH_CANID) += em_canid.o obj-$(CONFIG_NET_EMATCH_IPSET) += em_ipset.o obj-$(CONFIG_NET_EMATCH_IPT) += em_ipt.o + +obj-$(CONFIG_NET_P4_TC) += p4tc/ diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile new file mode 100644 index 000000000..dd1358c9e --- /dev/null +++ b/net/sched/p4tc/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-y := p4tc_types.o diff --git a/net/sched/p4tc/p4tc_types.c b/net/sched/p4tc/p4tc_types.c new file mode 100644 index 000000000..e1fc04932 --- /dev/null +++ b/net/sched/p4tc/p4tc_types.c @@ -0,0 +1,1247 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_types.c - P4 datatypes + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static DEFINE_IDR(p4tc_types_idr); + +static void p4tc_types_put(void) +{ + unsigned long tmp, typeid; + struct p4tc_type *type; + + idr_for_each_entry_ul(&p4tc_types_idr, type, tmp, typeid) { + idr_remove(&p4tc_types_idr, typeid); + kfree(type); + } +} + +struct p4tc_type *p4type_find_byid(int typeid) +{ + return idr_find(&p4tc_types_idr, typeid); +} + +static struct p4tc_type *p4type_find_byname(const char *name) +{ + unsigned long tmp, typeid; + struct p4tc_type *type; + + idr_for_each_entry_ul(&p4tc_types_idr, type, tmp, typeid) { + if (!strncmp(type->name, name, P4TC_T_MAX_STR_SZ)) + return type; + } + + return NULL; +} + +bool p4tc_is_type_unsigned(int typeid) +{ + switch (typeid) { + case P4TC_T_U8: + case P4TC_T_U16: + case P4TC_T_U32: + case P4TC_T_U64: + case P4TC_T_U128: + case P4TC_T_BOOL: + return true; + default: + return false; + } +} + +void p4t_copy(struct p4tc_type_mask_shift *dst_mask_shift, + struct p4tc_type *dst_t, void *dstv, + struct p4tc_type_mask_shift *src_mask_shift, + struct p4tc_type *src_t, void *srcv) +{ + u64 readval[BITS_TO_U64(P4TC_MAX_KEYSZ)] = {0}; + const struct p4tc_type_ops *srco, *dsto; + + dsto = dst_t->ops; + srco = src_t->ops; + + __p4tc_type_host_read(srco, src_t, src_mask_shift, srcv, + &readval); + __p4tc_type_host_write(dsto, dst_t, dst_mask_shift, &readval, + dstv); +} + +int p4t_cmp(struct p4tc_type_mask_shift *dst_mask_shift, + struct p4tc_type *dst_t, void *dstv, + struct p4tc_type_mask_shift *src_mask_shift, + struct p4tc_type *src_t, void *srcv) +{ + u64 a[BITS_TO_U64(P4TC_MAX_KEYSZ)] = {0}; + u64 b[BITS_TO_U64(P4TC_MAX_KEYSZ)] = {0}; + const struct p4tc_type_ops *srco, *dsto; + + dsto = dst_t->ops; + srco = src_t->ops; + + __p4tc_type_host_read(dsto, dst_t, dst_mask_shift, dstv, a); + __p4tc_type_host_read(srco, src_t, src_mask_shift, srcv, b); + + return memcmp(a, b, sizeof(a)); +} + +void p4t_release(struct p4tc_type_mask_shift *mask_shift) +{ + kfree(mask_shift->mask); + kfree(mask_shift); +} + +static int p4t_validate_bitpos(u16 bitstart, u16 bitend, u16 maxbitstart, + u16 maxbitend, struct netlink_ext_ack *extack) +{ + if (bitstart > maxbitstart) { + NL_SET_ERR_MSG_MOD(extack, "bitstart too high"); + return -EINVAL; + } + + if (bitend > maxbitend) { + NL_SET_ERR_MSG_MOD(extack, "bitend too high"); + return -EINVAL; + } + + if (bitstart > bitend) { + NL_SET_ERR_MSG_MOD(extack, "bitstart > bitend"); + return -EINVAL; + } + + return 0; +} + +static int p4t_u32_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + u32 container_maxsz = U32_MAX; + u32 *val = value; + size_t maxval; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 31, 31, extack); + if (ret < 0) + return ret; + + maxval = GENMASK(bitend, 0); + if (val && (*val > container_maxsz || *val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "U32 value out of range"); + return -EINVAL; + } + + return 0; +} + +static struct p4tc_type_mask_shift * +p4t_u32_bitops(u16 bitsiz, u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + struct p4tc_type_mask_shift *mask_shift; + u32 mask = GENMASK(bitend, bitstart); + u32 *cmask; + + mask_shift = kzalloc(sizeof(*mask_shift), GFP_KERNEL); + if (!mask_shift) + return ERR_PTR(-ENOMEM); + + cmask = kzalloc(sizeof(u32), GFP_KERNEL); + if (!cmask) { + kfree(mask_shift); + return ERR_PTR(-ENOMEM); + } + + *cmask = mask; + + mask_shift->mask = cmask; + mask_shift->shift = bitstart; + + return mask_shift; +} + +static void p4t_u32_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u32 maskedst = 0; + u32 *dst = dval; + u32 *src = sval; + u8 shift = 0; + + if (mask_shift) { + u32 *dmask = mask_shift->mask; + + maskedst = *dst & ~*dmask; + shift = mask_shift->shift; + } + + *dst = maskedst | (*src << shift); +} + +static void p4t_u32_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u32 *v = val; + + pr_info("%s 0x%x\n", prefix, *v); +} + +static void p4t_u32_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u32 *dst = dval; + u32 *src = sval; + + if (mask_shift) { + u32 *smask = mask_shift->mask; + u8 shift = mask_shift->shift; + + *dst = (*src & *smask) >> shift; + } else { + *dst = *src; + } +} + +static int p4t_s32_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + s32 minsz = S32_MIN, maxsz = S32_MAX; + s32 *val = value; + + if (val && (*val > maxsz || *val < minsz)) { + NL_SET_ERR_MSG_MOD(extack, "S32 value out of range"); + return -EINVAL; + } + + return 0; +} + +static void p4t_s32_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + s32 *dst = dval; + s32 *src = sval; + + *dst = *src; +} + +static void p4t_s32_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + s32 *dst = dval; + s32 *src = sval; + + *dst = *src; +} + +static void p4t_s32_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + s32 *v = val; + + pr_info("%s %x\n", prefix, *v); +} + +static void p4t_s64_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + s64 *v = val; + + pr_info("%s 0x%llx\n", prefix, *v); +} + +static int p4t_be32_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + size_t container_maxsz = U32_MAX; + __be32 *val_u32 = value; + __u32 val = 0; + size_t maxval; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 31, 31, extack); + if (ret < 0) + return ret; + + if (value) + val = be32_to_cpu(*val_u32); + + maxval = GENMASK(bitend, 0); + if (val && (val > container_maxsz || val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "BE32 value out of range"); + return -EINVAL; + } + + return 0; +} + +static void p4t_be32_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be32 *src = sval; + u32 *dst = dval; + + *dst = be32_to_cpu(*src); +} + +static void p4t_be32_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be32 *dst = dval; + u32 *src = sval; + + *dst = cpu_to_be32(*src); +} + +static void p4t_be32_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + __be32 *v = val; + + pr_info("%s 0x%x\n", prefix, *v); +} + +static void p4t_be64_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be64 *src = sval; + u64 *dst = dval; + + *dst = be64_to_cpu(*src); +} + +static void p4t_be64_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be64 *dst = dval; + u64 *src = sval; + + *dst = cpu_to_be64(*src); +} + +static void p4t_be64_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + __be64 *v = val; + + pr_info("%s 0x%llx\n", prefix, *v); +} + +static int p4t_u16_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + u16 container_maxsz = U16_MAX; + u16 *val = value; + u16 maxval; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 15, 15, extack); + if (ret < 0) + return ret; + + maxval = GENMASK(bitend, 0); + if (val && (*val > container_maxsz || *val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "U16 value out of range"); + return -EINVAL; + } + + return 0; +} + +static struct p4tc_type_mask_shift * +p4t_u16_bitops(u16 bitsiz, u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + struct p4tc_type_mask_shift *mask_shift; + u16 mask = GENMASK(bitend, bitstart); + u16 *cmask; + + mask_shift = kzalloc(sizeof(*mask_shift), GFP_KERNEL); + if (!mask_shift) + return ERR_PTR(-ENOMEM); + + cmask = kzalloc(sizeof(u16), GFP_KERNEL); + if (!cmask) { + kfree(mask_shift); + return ERR_PTR(-ENOMEM); + } + + *cmask = mask; + + mask_shift->mask = cmask; + mask_shift->shift = bitstart; + + return mask_shift; +} + +static void p4t_u16_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u16 maskedst = 0; + u16 *dst = dval; + u16 *src = sval; + u8 shift = 0; + + if (mask_shift) { + u16 *dmask = mask_shift->mask; + + maskedst = *dst & ~*dmask; + shift = mask_shift->shift; + } + + *dst = maskedst | (*src << shift); +} + +static void p4t_u16_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u16 *v = val; + + pr_info("%s 0x%x\n", prefix, *v); +} + +static void p4t_u16_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u16 *dst = dval; + u16 *src = sval; + + if (mask_shift) { + u16 *smask = mask_shift->mask; + u8 shift = mask_shift->shift; + + *dst = (*src & *smask) >> shift; + } else { + *dst = *src; + } +} + +static int p4t_s16_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + s16 minsz = S16_MIN, maxsz = S16_MAX; + s16 *val = value; + + if (val && (*val > maxsz || *val < minsz)) { + NL_SET_ERR_MSG_MOD(extack, "S16 value out of range"); + return -EINVAL; + } + + return 0; +} + +static void p4t_s16_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + s16 *dst = dval; + s16 *src = sval; + + *dst = *src; +} + +static void p4t_s16_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + s16 *dst = dval; + s16 *src = sval; + + *src = *dst; +} + +static void p4t_s16_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + s16 *v = val; + + pr_info("%s %d\n", prefix, *v); +} + +static int p4t_be16_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + u16 container_maxsz = U16_MAX; + __be16 *val_u16 = value; + size_t maxval; + u16 val = 0; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 15, 15, extack); + if (ret < 0) + return ret; + + if (value) + val = be16_to_cpu(*val_u16); + + maxval = GENMASK(bitend, 0); + if (val && (val > container_maxsz || val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "BE16 value out of range"); + return -EINVAL; + } + + return 0; +} + +static void p4t_be16_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be16 *src = sval; + u16 *dst = dval; + + *dst = be16_to_cpu(*src); +} + +static void p4t_be16_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + __be16 *dst = dval; + u16 *src = sval; + + *dst = cpu_to_be16(*src); +} + +static void p4t_be16_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + __be16 *v = val; + + pr_info("%s 0x%x\n", prefix, *v); +} + +static int p4t_u8_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + size_t container_maxsz = U8_MAX; + u8 *val = value; + u8 maxval; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 7, 7, extack); + if (ret < 0) + return ret; + + maxval = GENMASK(bitend, 0); + if (val && (*val > container_maxsz || *val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "U8 value out of range"); + return -EINVAL; + } + + return 0; +} + +static struct p4tc_type_mask_shift * +p4t_u8_bitops(u16 bitsiz, u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + struct p4tc_type_mask_shift *mask_shift; + u8 mask = GENMASK(bitend, bitstart); + u8 *cmask; + + mask_shift = kzalloc(sizeof(*mask_shift), GFP_KERNEL); + if (!mask_shift) + return ERR_PTR(-ENOMEM); + + cmask = kzalloc(sizeof(u8), GFP_KERNEL); + if (!cmask) { + kfree(mask_shift); + return ERR_PTR(-ENOMEM); + } + + *cmask = mask; + + mask_shift->mask = cmask; + mask_shift->shift = bitstart; + + return mask_shift; +} + +static void p4t_u8_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u8 maskedst = 0; + u8 *dst = dval; + u8 *src = sval; + u8 shift = 0; + + if (mask_shift) { + u8 *dmask = (u8 *)mask_shift->mask; + + maskedst = *dst & ~*dmask; + shift = mask_shift->shift; + } + + *dst = maskedst | (*src << shift); +} + +static void p4t_u8_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u8 *v = val; + + pr_info("%s 0x%x\n", prefix, *v); +} + +static void p4t_u8_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u8 *dst = dval; + u8 *src = sval; + + if (mask_shift) { + u8 *smask = mask_shift->mask; + u8 shift = mask_shift->shift; + + *dst = (*src & *smask) >> shift; + } else { + *dst = *src; + } +} + +static int p4t_s8_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + s8 minsz = S8_MIN, maxsz = S8_MAX; + s8 *val = value; + + if (val && (*val > maxsz || *val < minsz)) { + NL_SET_ERR_MSG_MOD(extack, "S8 value out of range"); + return -EINVAL; + } + + return 0; +} + +static void p4t_s8_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + s8 *dst = dval; + s8 *src = sval; + + *dst = *src; +} + +static void p4t_s8_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + s8 *v = val; + + pr_info("%s %d\n", prefix, *v); +} + +static int p4t_u64_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + u64 container_maxsz = U64_MAX; + u8 *val = value; + u64 maxval; + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 63, 63, extack); + if (ret < 0) + return ret; + + maxval = GENMASK_ULL(bitend, 0); + if (val && (*val > container_maxsz || *val > maxval)) { + NL_SET_ERR_MSG_MOD(extack, "U64 value out of range"); + return -EINVAL; + } + + return 0; +} + +static struct p4tc_type_mask_shift * +p4t_u64_bitops(u16 bitsiz, u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + struct p4tc_type_mask_shift *mask_shift; + u64 mask = GENMASK(bitend, bitstart); + u64 *cmask; + + mask_shift = kzalloc(sizeof(*mask_shift), GFP_KERNEL); + if (!mask_shift) + return ERR_PTR(-ENOMEM); + + cmask = kzalloc(sizeof(u64), GFP_KERNEL); + if (!cmask) { + kfree(mask_shift); + return ERR_PTR(-ENOMEM); + } + + *cmask = mask; + + mask_shift->mask = cmask; + mask_shift->shift = bitstart; + + return mask_shift; +} + +static void p4t_u64_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u64 maskedst = 0; + u64 *dst = dval; + u64 *src = sval; + u8 shift = 0; + + if (mask_shift) { + u64 *dmask = (u64 *)mask_shift->mask; + + maskedst = *dst & ~*dmask; + shift = mask_shift->shift; + } + + *dst = maskedst | (*src << shift); +} + +static void p4t_u64_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u64 *v = val; + + pr_info("%s 0x%llx\n", prefix, *v); +} + +static void p4t_u64_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u64 *dst = dval; + u64 *src = sval; + + if (mask_shift) { + u64 *smask = mask_shift->mask; + u8 shift = mask_shift->shift; + + *dst = (*src & *smask) >> shift; + } else { + *dst = *src; + } +} + +/* As of now, we are not allowing bitops for u128 */ +static int p4t_u128_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + if (bitstart != 0 || bitend != 127) { + NL_SET_ERR_MSG_MOD(extack, + "Only valid bit type larger than bit64 is bit128"); + return -EINVAL; + } + + return 0; +} + +static void p4t_u128_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + memcpy(sval, dval, sizeof(__u64) * 2); +} + +static void p4t_u128_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + memcpy(sval, dval, sizeof(__u64) * 2); +} + +static void p4t_u128_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u64 *v = val; + + pr_info("%s[0-63] %16llx", prefix, v[0]); + pr_info("%s[64-127] %16llx", prefix, v[1]); +} + +static int p4t_ipv4_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + /* Not allowing bit-slices for now */ + if (bitstart != 0 || bitend != 31) { + NL_SET_ERR_MSG_MOD(extack, "Invalid bitstart or bitend"); + return -EINVAL; + } + + return 0; +} + +static void p4t_ipv4_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u32 *v32h = val; + __be32 v32; + u8 *v; + + v32 = cpu_to_be32(*v32h); + v = (u8 *)&v32; + + pr_info("%s %u.%u.%u.%u\n", prefix, v[0], v[1], v[2], v[3]); +} + +static int p4t_mac_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + if (bitstart != 0 || bitend != 47) { + NL_SET_ERR_MSG_MOD(extack, "Invalid bitstart or bitend"); + return -EINVAL; + } + + return 0; +} + +static void p4t_mac_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u8 *v = val; + + pr_info("%s %02X:%02x:%02x:%02x:%02x:%02x\n", prefix, v[0], v[1], v[2], + v[3], v[4], v[5]); +} + +static int p4t_dev_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + if (bitstart != 0 || bitend != 31) { + NL_SET_ERR_MSG_MOD(extack, "Invalid start or endbit values"); + return -EINVAL; + } + + return 0; +} + +static void p4t_dev_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u32 *src = sval; + u32 *dst = dval; + + *dst = *src; +} + +static void p4t_dev_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + u32 *src = sval; + u32 *dst = dval; + + *dst = *src; +} + +static void p4t_dev_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + const u32 *ifindex = val; + struct net_device *dev; + + dev = dev_get_by_index_rcu(net, *ifindex); + + pr_info("%s %s\n", prefix, dev->name); +} + +static void p4t_key_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + memcpy(dval, sval, BITS_TO_BYTES(container->bitsz)); +} + +static void p4t_key_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + memcpy(dval, sval, BITS_TO_BYTES(container->bitsz)); +} + +static void p4t_key_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + u16 bitstart = 0, bitend = 63; + u64 *v = val; + int i; + + for (i = 0; i < BITS_TO_U64(container->bitsz); i++) { + pr_info("%s[%u-%u] %16llx\n", prefix, bitstart, bitend, v[i]); + bitstart += 64; + bitend += 64; + } +} + +static int p4t_key_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + if (p4t_validate_bitpos(bitstart, bitend, 0, P4TC_MAX_KEYSZ, extack)) + return -EINVAL; + + return 0; +} + +static int p4t_bool_validate(struct p4tc_type *container, void *value, + u16 bitstart, u16 bitend, + struct netlink_ext_ack *extack) +{ + int ret; + + ret = p4t_validate_bitpos(bitstart, bitend, 7, 7, extack); + if (ret < 0) + return ret; + + return -EINVAL; +} + +static void p4t_bool_hread(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + bool *dst = dval; + bool *src = sval; + + *dst = *src; +} + +static void p4t_bool_write(struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + bool *dst = dval; + bool *src = sval; + + *dst = *src; +} + +static void p4t_bool_print(struct net *net, struct p4tc_type *container, + const char *prefix, void *val) +{ + bool *v = val; + + pr_info("%s %s", prefix, *v ? "true" : "false"); +} + +static const struct p4tc_type_ops u8_ops = { + .validate_p4t = p4t_u8_validate, + .create_bitops = p4t_u8_bitops, + .host_read = p4t_u8_hread, + .host_write = p4t_u8_write, + .print = p4t_u8_print, +}; + +static const struct p4tc_type_ops u16_ops = { + .validate_p4t = p4t_u16_validate, + .create_bitops = p4t_u16_bitops, + .host_read = p4t_u16_hread, + .host_write = p4t_u16_write, + .print = p4t_u16_print, +}; + +static const struct p4tc_type_ops u32_ops = { + .validate_p4t = p4t_u32_validate, + .create_bitops = p4t_u32_bitops, + .host_read = p4t_u32_hread, + .host_write = p4t_u32_write, + .print = p4t_u32_print, +}; + +static const struct p4tc_type_ops u64_ops = { + .validate_p4t = p4t_u64_validate, + .create_bitops = p4t_u64_bitops, + .host_read = p4t_u64_hread, + .host_write = p4t_u64_write, + .print = p4t_u64_print, +}; + +static const struct p4tc_type_ops u128_ops = { + .validate_p4t = p4t_u128_validate, + .host_read = p4t_u128_hread, + .host_write = p4t_u128_write, + .print = p4t_u128_print, +}; + +static const struct p4tc_type_ops s8_ops = { + .validate_p4t = p4t_s8_validate, + .host_read = p4t_s8_hread, + .print = p4t_s8_print, +}; + +static const struct p4tc_type_ops s16_ops = { + .validate_p4t = p4t_s16_validate, + .host_read = p4t_s16_hread, + .host_write = p4t_s16_write, + .print = p4t_s16_print, +}; + +static const struct p4tc_type_ops s32_ops = { + .validate_p4t = p4t_s32_validate, + .host_read = p4t_s32_hread, + .host_write = p4t_s32_write, + .print = p4t_s32_print, +}; + +static const struct p4tc_type_ops s64_ops = { + .print = p4t_s64_print, +}; + +static const struct p4tc_type_ops s128_ops = {}; + +static const struct p4tc_type_ops be16_ops = { + .validate_p4t = p4t_be16_validate, + .create_bitops = p4t_u16_bitops, + .host_read = p4t_be16_hread, + .host_write = p4t_be16_write, + .print = p4t_be16_print, +}; + +static const struct p4tc_type_ops be32_ops = { + .validate_p4t = p4t_be32_validate, + .create_bitops = p4t_u32_bitops, + .host_read = p4t_be32_hread, + .host_write = p4t_be32_write, + .print = p4t_be32_print, +}; + +static const struct p4tc_type_ops be64_ops = { + .validate_p4t = p4t_u64_validate, + .host_read = p4t_be64_hread, + .host_write = p4t_be64_write, + .print = p4t_be64_print, +}; + +static const struct p4tc_type_ops string_ops = {}; + +static const struct p4tc_type_ops mac_ops = { + .validate_p4t = p4t_mac_validate, + .create_bitops = p4t_u64_bitops, + .host_read = p4t_u64_hread, + .host_write = p4t_u64_write, + .print = p4t_mac_print, +}; + +static const struct p4tc_type_ops ipv4_ops = { + .validate_p4t = p4t_ipv4_validate, + .host_read = p4t_be32_hread, + .host_write = p4t_be32_write, + .print = p4t_ipv4_print, +}; + +static const struct p4tc_type_ops bool_ops = { + .validate_p4t = p4t_bool_validate, + .host_read = p4t_bool_hread, + .host_write = p4t_bool_write, + .print = p4t_bool_print, +}; + +static const struct p4tc_type_ops dev_ops = { + .validate_p4t = p4t_dev_validate, + .host_read = p4t_dev_hread, + .host_write = p4t_dev_write, + .print = p4t_dev_print, +}; + +static const struct p4tc_type_ops key_ops = { + .validate_p4t = p4t_key_validate, + .host_read = p4t_key_hread, + .host_write = p4t_key_write, + .print = p4t_key_print, +}; + +#ifdef CONFIG_RETPOLINE +void __p4tc_type_host_read(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + #define HREAD(cops) \ + do { \ + if (ops == &(cops)) \ + return (cops).host_read(container, mask_shift, sval, dval); \ + } while (0) + + HREAD(u8_ops); + HREAD(u16_ops); + HREAD(u32_ops); + HREAD(u64_ops); + HREAD(u128_ops); + HREAD(s8_ops); + HREAD(s16_ops); + HREAD(s32_ops); + HREAD(be16_ops); + HREAD(be32_ops); + HREAD(mac_ops); + HREAD(ipv4_ops); + HREAD(bool_ops); + HREAD(dev_ops); + HREAD(key_ops); + + return ops->host_read(container, mask_shift, sval, dval); +} + +void __p4tc_type_host_write(const struct p4tc_type_ops *ops, + struct p4tc_type *container, + struct p4tc_type_mask_shift *mask_shift, void *sval, + void *dval) +{ + #define HWRITE(cops) \ + do { \ + if (ops == &(cops)) \ + return (cops).host_write(container, mask_shift, sval, dval); \ + } while (0) + + HWRITE(u8_ops); + HWRITE(u16_ops); + HWRITE(u32_ops); + HWRITE(u64_ops); + HWRITE(u128_ops); + HWRITE(s16_ops); + HWRITE(s32_ops); + HWRITE(be16_ops); + HWRITE(be32_ops); + HWRITE(mac_ops); + HWRITE(ipv4_ops); + HWRITE(bool_ops); + HWRITE(dev_ops); + HWRITE(key_ops); + + return ops->host_write(container, mask_shift, sval, dval); +} +#endif + +static int ___p4tc_register_type(int typeid, size_t bitsz, + size_t container_bitsz, + const char *t_name, + const struct p4tc_type_ops *ops) +{ + struct p4tc_type *type; + int err; + + if (typeid > P4TC_T_MAX) + return -EINVAL; + + if (p4type_find_byid(typeid) || p4type_find_byname(t_name)) + return -EEXIST; + + if (bitsz > P4TC_T_MAX_BITSZ) + return -E2BIG; + + if (container_bitsz > P4TC_T_MAX_BITSZ) + return -E2BIG; + + type = kzalloc(sizeof(*type), GFP_ATOMIC); + if (!type) + return -ENOMEM; + + err = idr_alloc_u32(&p4tc_types_idr, type, &typeid, typeid, GFP_ATOMIC); + if (err < 0) + return err; + + strscpy(type->name, t_name, P4TC_T_MAX_STR_SZ); + type->typeid = typeid; + type->bitsz = bitsz; + type->container_bitsz = container_bitsz; + type->ops = ops; + + return 0; +} + +static int __p4tc_register_type(int typeid, size_t bitsz, + size_t container_bitsz, + const char *t_name, + const struct p4tc_type_ops *ops) +{ + if (___p4tc_register_type(typeid, bitsz, container_bitsz, t_name, ops) < + 0) { + pr_err("Unable to allocate p4 type %s\n", t_name); + p4tc_types_put(); + return -1; + } + + return 0; +} + +#define p4tc_register_type(...) \ + do { \ + if (__p4tc_register_type(__VA_ARGS__) < 0) \ + return -1; \ + } while (0) + +int p4tc_register_types(void) +{ + p4tc_register_type(P4TC_T_U8, 8, 8, "u8", &u8_ops); + p4tc_register_type(P4TC_T_U16, 16, 16, "u16", &u16_ops); + p4tc_register_type(P4TC_T_U32, 32, 32, "u32", &u32_ops); + p4tc_register_type(P4TC_T_U64, 64, 64, "u64", &u64_ops); + p4tc_register_type(P4TC_T_U128, 128, 128, "u128", &u128_ops); + p4tc_register_type(P4TC_T_S8, 8, 8, "s8", &s8_ops); + p4tc_register_type(P4TC_T_BE16, 16, 16, "be16", &be16_ops); + p4tc_register_type(P4TC_T_BE32, 32, 32, "be32", &be32_ops); + p4tc_register_type(P4TC_T_BE64, 64, 64, "be64", &be64_ops); + p4tc_register_type(P4TC_T_S16, 16, 16, "s16", &s16_ops); + p4tc_register_type(P4TC_T_S32, 32, 32, "s32", &s32_ops); + p4tc_register_type(P4TC_T_S64, 64, 64, "s64", &s64_ops); + p4tc_register_type(P4TC_T_S128, 128, 128, "s128", &s128_ops); + p4tc_register_type(P4TC_T_STRING, P4TC_T_MAX_STR_SZ * 4, + P4TC_T_MAX_STR_SZ * 4, "string", &string_ops); + p4tc_register_type(P4TC_T_MACADDR, 48, 64, "mac", &mac_ops); + p4tc_register_type(P4TC_T_IPV4ADDR, 32, 32, "ipv4", &ipv4_ops); + p4tc_register_type(P4TC_T_BOOL, 32, 32, "bool", &bool_ops); + p4tc_register_type(P4TC_T_DEV, 32, 32, "dev", &dev_ops); + p4tc_register_type(P4TC_T_KEY, P4TC_MAX_KEYSZ, P4TC_MAX_KEYSZ, "key", + &key_ops); + + return 0; +} + +void p4tc_unregister_types(void) +{ + p4tc_types_put(); +} From patchwork Fri Dec 1 18:28:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476268 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:19 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 09/15] p4tc: add template pipeline create, get, update, delete Date: Fri, 1 Dec 2023 13:28:58 -0500 Message-Id: <20231201182904.532825-10-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org __Introducing P4 TC Pipeline__ This commit introduces P4 TC pipelines, which emulate the semantics of a P4 program/pipeline using the TC infrastructure. One can refer to P4 programs/pipelines using their names or their specific pipeline ids (pipeid) P4 template CRUD (Create, Read/get, Update and Delete) commands apply on a pipeline. As an example, to create a P4 program/pipeline named aP4proggie with a single table in its pipeline, one would use the following command from user space tc (as generated by the compiler): tc p4template create pipeline/aP4proggie numtables 1 pipeid 1 Note that, in the above command, the numtables is set as 1; the default is 0 because it is feasible to have a P4 program with no tables at all. The P4 compiler will generate the pipeid, however if none is specified, the kernel will issue one. Like the following example: tc p4template create pipeline/aP4proggie numtables 1 To Read pipeline aP4proggie attributes, one would retrieve those details as follows: tc p4template get pipeline/[aP4proggie] [pipeid 1] Note that in the above command one may specify pipeline ID, name or both. To Update aP4proggie pipeline from 1 to 10 tables, one would use the following command: tc p4template update pipeline/[aP4proggie] [pipeid 1] numtables 10 Note that, in the above command, one could use the P4 program/pipeline name, id or both to specify which P4 program/pipeline to update. To Delete a P4 program/pipeline named aP4proggie with a pipeid of 1, one would use the following command: tc p4template del pipeline/[aP4proggie] [pipeid 1] Note that, in the above command, one could use the P4 program/pipeline name, id or both to specify which P4 program/pipeline to delete If one wished to dump all the created P4 programs/pipelines, one would use the following command: tc p4template get pipeline/ __Pipeline Lifetime__ After Create is issued, one can Read/get, Update and Delete; however the pipeline can only be put to use after it is "sealed". To seal a pipeline, one would issue the following command: tc p4template update pipeline/aP4proggie state ready After a pipeline is sealed it can be put to use via the TC P4 classifier. For example: tc filter add dev $DEV ingress protocol any prio 6 p4 pname aP4proggie \ action bpf obj $PARSER.o section prog/tc-parser action bpf obj $PROGNAME.o section prog/tc-ingress Instantiates aP4proggie in the ingress of $DEV. One could also attach it to a block of ports (example tc block 22) as such: tc filter add block 22 ingress protocol all prio 6 p4 pname aP4proggie \ action bpf obj $PARSER.o section prog/tc-parser action bpf obj $PROGNAME.o section prog/tc-ingress We can, after that, add a table entry. Like, for example: tc p4ctrl create aP4proggie/table/cb/aP4table \ dstAddr 10.10.10.0/24 srcAddr 192.168.0.0/16 prio 16 \ action drop Once the pipeline is attached to a device or block it cannot be deleted. It becomes Read-only from the control plane/user space. The pipeline can be deleted when there are no longer any users left. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/p4tc.h | 126 +++++++ include/uapi/linux/p4tc.h | 66 ++++ include/uapi/linux/rtnetlink.h | 9 + net/sched/p4tc/Makefile | 2 +- net/sched/p4tc/p4tc_pipeline.c | 611 +++++++++++++++++++++++++++++++++ net/sched/p4tc/p4tc_tmpl_api.c | 585 +++++++++++++++++++++++++++++++ security/selinux/nlmsgtab.c | 6 +- 7 files changed, 1403 insertions(+), 2 deletions(-) create mode 100644 include/net/p4tc.h create mode 100644 net/sched/p4tc/p4tc_pipeline.c create mode 100644 net/sched/p4tc/p4tc_tmpl_api.c diff --git a/include/net/p4tc.h b/include/net/p4tc.h new file mode 100644 index 000000000..25f7eb322 --- /dev/null +++ b/include/net/p4tc.h @@ -0,0 +1,126 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_P4TC_H +#define __NET_P4TC_H + +#include +#include +#include +#include +#include +#include +#include + +#define P4TC_DEFAULT_NUM_TABLES P4TC_MINTABLES_COUNT +#define P4TC_DEFAULT_MAX_RULES 1 +#define P4TC_PATH_MAX 3 + +#define P4TC_KERNEL_PIPEID 0 + +#define P4TC_PID_IDX 0 + +struct p4tc_dump_ctx { + u32 ids[P4TC_PATH_MAX]; +}; + +struct p4tc_template_common; + +struct p4tc_path_nlattrs { + char *pname; + u32 *ids; + bool pname_passed; +}; + +struct p4tc_pipeline; +struct p4tc_template_ops { + void (*init)(void); + struct p4tc_template_common *(*cu)(struct net *net, struct nlmsghdr *n, + struct nlattr *nla, + struct p4tc_path_nlattrs *nl_pname, + struct netlink_ext_ack *extack); + int (*put)(struct p4tc_pipeline *pipeline, + struct p4tc_template_common *tmpl, + struct netlink_ext_ack *extack); + int (*gd)(struct net *net, struct sk_buff *skb, struct nlmsghdr *n, + struct nlattr *nla, struct p4tc_path_nlattrs *nl_pname, + struct netlink_ext_ack *extack); + int (*fill_nlmsg)(struct net *net, struct sk_buff *skb, + struct p4tc_template_common *tmpl, + struct netlink_ext_ack *extack); + int (*dump)(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct nlattr *nla, char **p_name, u32 *ids, + struct netlink_ext_ack *extack); + int (*dump_1)(struct sk_buff *skb, struct p4tc_template_common *common); +}; + +struct p4tc_template_common { + char name[P4TC_TMPL_NAMSZ]; + struct p4tc_template_ops *ops; + u32 p_id; + u32 PAD0; +}; + +extern const struct p4tc_template_ops p4tc_pipeline_ops; + +struct p4tc_pipeline { + struct p4tc_template_common common; + struct rcu_head rcu; + struct net *net; + /* Accounts for how many entities are referencing this pipeline. + * As for now only P4 filters can refer to pipelines. + */ + refcount_t p_ctrl_ref; + u16 num_tables; + u16 curr_tables; + u8 p_state; +}; + +struct p4tc_pipeline_net { + struct idr pipeline_idr; +}; + +static inline bool p4tc_tmpl_msg_is_update(struct nlmsghdr *n) +{ + return n->nlmsg_type == RTM_UPDATEP4TEMPLATE; +} + +int p4tc_tmpl_generic_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct idr *idr, int idx, + struct netlink_ext_ack *extack); + +struct p4tc_pipeline *p4tc_pipeline_find_byany(struct net *net, + const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack); +struct p4tc_pipeline *p4tc_pipeline_find_byid(struct net *net, + const u32 pipeid); +struct p4tc_pipeline *p4tc_pipeline_find_get(struct net *net, + const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack); + +static inline bool p4tc_pipeline_get(struct p4tc_pipeline *pipeline) +{ + return refcount_inc_not_zero(&pipeline->p_ctrl_ref); +} + +void p4tc_pipeline_put(struct p4tc_pipeline *pipeline); +struct p4tc_pipeline * +p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack); + +static inline int p4tc_action_destroy(struct tc_action **acts) +{ + int ret = 0; + + if (acts) { + ret = tcf_action_destroy(acts, TCA_ACT_UNBIND); + kfree(acts); + } + + return ret; +} + +#define to_pipeline(t) ((struct p4tc_pipeline *)t) + +#endif diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h index 0133947c5..382542e83 100644 --- a/include/uapi/linux/p4tc.h +++ b/include/uapi/linux/p4tc.h @@ -2,8 +2,71 @@ #ifndef __LINUX_P4TC_H #define __LINUX_P4TC_H +#include +#include + +/* pipeline header */ +struct p4tcmsg { + __u32 pipeid; + __u32 obj; +}; + +#define P4TC_MAXPIPELINE_COUNT 32 +#define P4TC_MAXTABLES_COUNT 32 +#define P4TC_MINTABLES_COUNT 0 +#define P4TC_MSGBATCH_SIZE 16 + #define P4TC_MAX_KEYSZ 512 +#define P4TC_TMPL_NAMSZ 32 +#define P4TC_PIPELINE_NAMSIZ P4TC_TMPL_NAMSZ + +/* Root attributes */ +enum { + P4TC_ROOT_UNSPEC, + P4TC_ROOT, /* nested messages */ + P4TC_ROOT_PNAME, /* string */ + __P4TC_ROOT_MAX, +}; + +#define P4TC_ROOT_MAX (__P4TC_ROOT_MAX - 1) + +/* P4 Object types */ +enum { + P4TC_OBJ_UNSPEC, + P4TC_OBJ_PIPELINE, + __P4TC_OBJ_MAX, +}; + +#define P4TC_OBJ_MAX (__P4TC_OBJ_MAX - 1) + +/* P4 attributes */ +enum { + P4TC_UNSPEC, + P4TC_PATH, + P4TC_PARAMS, + __P4TC_MAX, +}; + +#define P4TC_MAX (__P4TC_MAX - 1) + +/* PIPELINE attributes */ +enum { + P4TC_PIPELINE_UNSPEC, + P4TC_PIPELINE_NUMTABLES, /* u16 */ + P4TC_PIPELINE_STATE, /* u8 */ + P4TC_PIPELINE_NAME, /* string only used for pipeline dump */ + __P4TC_PIPELINE_MAX +}; + +#define P4TC_PIPELINE_MAX (__P4TC_PIPELINE_MAX - 1) + +/* PIPELINE states */ +enum { + P4TC_STATE_NOT_READY, + P4TC_STATE_READY, +}; + enum { P4TC_T_UNSPEC, P4TC_T_U8, @@ -30,4 +93,7 @@ enum { #define P4TC_T_MAX (__P4TC_T_MAX - 1) +#define P4TC_RTA(r) \ + ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct p4tcmsg)))) + #endif diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h index 3b687d20c..4f9ebe3e7 100644 --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -194,6 +194,15 @@ enum { RTM_GETTUNNEL, #define RTM_GETTUNNEL RTM_GETTUNNEL + RTM_CREATEP4TEMPLATE = 124, +#define RTM_CREATEP4TEMPLATE RTM_CREATEP4TEMPLATE + RTM_DELP4TEMPLATE, +#define RTM_DELP4TEMPLATE RTM_DELP4TEMPLATE + RTM_GETP4TEMPLATE, +#define RTM_GETP4TEMPLATE RTM_GETP4TEMPLATE + RTM_UPDATEP4TEMPLATE, +#define RTM_UPDATEP4TEMPLATE RTM_UPDATEP4TEMPLATE + __RTM_MAX, #define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1) }; diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index dd1358c9e..0881a7563 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -1,3 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 -obj-y := p4tc_types.o +obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o diff --git a/net/sched/p4tc/p4tc_pipeline.c b/net/sched/p4tc/p4tc_pipeline.c new file mode 100644 index 000000000..6532dc899 --- /dev/null +++ b/net/sched/p4tc/p4tc_pipeline.c @@ -0,0 +1,611 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_pipeline.c P4 TC PIPELINE + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static unsigned int pipeline_net_id; +static struct p4tc_pipeline *root_pipeline; + +static __net_init int pipeline_init_net(struct net *net) +{ + struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); + + idr_init(&pipe_net->pipeline_idr); + + return 0; +} + +static int __p4tc_pipeline_put(struct p4tc_pipeline *pipeline, + struct p4tc_template_common *template, + struct netlink_ext_ack *extack); + +static void __net_exit pipeline_exit_net(struct net *net) +{ + struct p4tc_pipeline_net *pipe_net; + struct p4tc_pipeline *pipeline; + unsigned long pipeid, tmp; + + rtnl_lock(); + pipe_net = net_generic(net, pipeline_net_id); + idr_for_each_entry_ul(&pipe_net->pipeline_idr, pipeline, tmp, pipeid) { + __p4tc_pipeline_put(pipeline, &pipeline->common, NULL); + } + idr_destroy(&pipe_net->pipeline_idr); + rtnl_unlock(); +} + +static struct pernet_operations pipeline_net_ops = { + .init = pipeline_init_net, + .pre_exit = pipeline_exit_net, + .id = &pipeline_net_id, + .size = sizeof(struct p4tc_pipeline_net), +}; + +static const struct nla_policy tc_pipeline_policy[P4TC_PIPELINE_MAX + 1] = { + [P4TC_PIPELINE_NUMTABLES] = + NLA_POLICY_RANGE(NLA_U16, P4TC_MINTABLES_COUNT, P4TC_MAXTABLES_COUNT), + [P4TC_PIPELINE_STATE] = { .type = NLA_U8 }, +}; + +static void p4tc_pipeline_destroy(struct p4tc_pipeline *pipeline) +{ + kfree(pipeline); +} + +static void p4tc_pipeline_destroy_rcu(struct rcu_head *head) +{ + struct p4tc_pipeline *pipeline; + struct net *net; + + pipeline = container_of(head, struct p4tc_pipeline, rcu); + + net = pipeline->net; + p4tc_pipeline_destroy(pipeline); + put_net(net); +} + +static void p4tc_pipeline_teardown(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + struct net *net = pipeline->net; + struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); + struct net *pipeline_net = maybe_get_net(net); + + idr_remove(&pipe_net->pipeline_idr, pipeline->common.p_id); + + /* If we are on netns cleanup we can't touch the pipeline_idr. + * On pre_exit we will destroy the idr but never call into teardown + * if filters are active which makes pipeline pointers dangle until + * the filters ultimately destroy them. + */ + if (pipeline_net) { + idr_remove(&pipe_net->pipeline_idr, pipeline->common.p_id); + call_rcu(&pipeline->rcu, p4tc_pipeline_destroy_rcu); + } else { + p4tc_pipeline_destroy(pipeline); + } +} + +static int __p4tc_pipeline_put(struct p4tc_pipeline *pipeline, + struct p4tc_template_common *template, + struct netlink_ext_ack *extack) +{ + /* The lifetime of the pipeline can be terminated in two cases: + * - netns cleanup (system driven) + * - pipeline delete (user driven) + * + * When the pipeline is referenced by one or more p4 classifiers we need + * to make sure the pipeline and its components are alive while the classifier + * is still visible by the datapath. + * In the netns cleanup, we cannot destroy the pipeline in our netns exit callback + * as the netdevs and filters are still visible in the datapath. + * In such case, it's the filter's job to destroy the pipeline. + * + * To accommodate such scenario, whichever put call reaches '0' first will + * destroy the pipeline and its components. + * + * On netns cleanup we guarantee no table entries operations are in flight. + */ + if (!refcount_dec_and_test(&pipeline->p_ctrl_ref)) { + NL_SET_ERR_MSG(extack, "Can't delete referenced pipeline"); + return -EBUSY; + } + + p4tc_pipeline_teardown(pipeline, extack); + + return 0; +} + +static inline int pipeline_try_set_state_ready(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + if (pipeline->curr_tables != pipeline->num_tables) { + NL_SET_ERR_MSG(extack, + "Must have all table defined to update state to ready"); + return -EINVAL; + } + + pipeline->p_state = P4TC_STATE_READY; + return true; +} + +static inline bool p4tc_pipeline_sealed(struct p4tc_pipeline *pipeline) +{ + return pipeline->p_state == P4TC_STATE_READY; +} + +struct p4tc_pipeline *p4tc_pipeline_find_byid(struct net *net, const u32 pipeid) +{ + struct p4tc_pipeline_net *pipe_net; + + if (pipeid == P4TC_KERNEL_PIPEID) + return root_pipeline; + + pipe_net = net_generic(net, pipeline_net_id); + + return idr_find(&pipe_net->pipeline_idr, pipeid); +} +EXPORT_SYMBOL_GPL(p4tc_pipeline_find_byid); + +static struct p4tc_pipeline *p4tc_pipeline_find_byname(struct net *net, + const char *name) +{ + struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); + struct p4tc_pipeline *pipeline; + unsigned long tmp, id; + + idr_for_each_entry_ul(&pipe_net->pipeline_idr, pipeline, tmp, id) { + /* Don't show kernel pipeline */ + if (id == P4TC_KERNEL_PIPEID) + continue; + if (strncmp(pipeline->common.name, name, P4TC_PIPELINE_NAMSIZ) == 0) + return pipeline; + } + + return NULL; +} + +static struct p4tc_pipeline *p4tc_pipeline_create(struct net *net, + struct nlmsghdr *n, + struct nlattr *nla, + const char *p_name, u32 pipeid, + struct netlink_ext_ack *extack) +{ + struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); + struct nlattr *tb[P4TC_PIPELINE_MAX + 1]; + struct p4tc_pipeline *pipeline; + int ret = 0; + + ret = nla_parse_nested(tb, P4TC_PIPELINE_MAX, nla, tc_pipeline_policy, + extack); + + if (ret < 0) + goto out; + + pipeline = p4tc_pipeline_find_byany(net, p_name, pipeid, NULL); + if (pipeid != P4TC_KERNEL_PIPEID && !IS_ERR(pipeline)) { + NL_SET_ERR_MSG(extack, "Pipeline exists"); + ret = -EEXIST; + goto out; + } + + pipeline = kzalloc(sizeof(*pipeline), GFP_KERNEL); + if (unlikely(!pipeline)) + return ERR_PTR(-ENOMEM); + + if (!p_name || p_name[0] == '\0') { + NL_SET_ERR_MSG(extack, "Must specify pipeline name"); + ret = -EINVAL; + goto err; + } + + strscpy(pipeline->common.name, p_name, P4TC_PIPELINE_NAMSIZ); + + if (pipeid) { + ret = idr_alloc_u32(&pipe_net->pipeline_idr, pipeline, &pipeid, + pipeid, GFP_KERNEL); + } else { + pipeid = 1; + ret = idr_alloc_u32(&pipe_net->pipeline_idr, pipeline, &pipeid, + UINT_MAX, GFP_KERNEL); + } + + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate pipeline id"); + goto idr_rm; + } + + pipeline->common.p_id = pipeid; + + if (tb[P4TC_PIPELINE_NUMTABLES]) + pipeline->num_tables = + nla_get_u16(tb[P4TC_PIPELINE_NUMTABLES]); + else + pipeline->num_tables = P4TC_DEFAULT_NUM_TABLES; + + pipeline->p_state = P4TC_STATE_NOT_READY; + + pipeline->net = net; + + refcount_set(&pipeline->p_ctrl_ref, 1); + + pipeline->common.ops = (struct p4tc_template_ops *)&p4tc_pipeline_ops; + + return pipeline; + +idr_rm: + idr_remove(&pipe_net->pipeline_idr, pipeid); + +err: + kfree(pipeline); + +out: + return ERR_PTR(ret); +} + +struct p4tc_pipeline *p4tc_pipeline_find_byany(struct net *net, + const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack) +{ + struct p4tc_pipeline *pipeline = NULL; + + if (pipeid) { + pipeline = p4tc_pipeline_find_byid(net, pipeid); + if (!pipeline) { + NL_SET_ERR_MSG(extack, "Unable to find pipeline by id"); + return ERR_PTR(-EINVAL); + } + } else { + if (p_name) { + pipeline = p4tc_pipeline_find_byname(net, p_name); + if (!pipeline) { + NL_SET_ERR_MSG(extack, + "Pipeline name not found"); + return ERR_PTR(-EINVAL); + } + } else { + NL_SET_ERR_MSG(extack, + "Must specify pipeline name or id"); + return ERR_PTR(-EINVAL); + } + } + + return pipeline; +} + +struct p4tc_pipeline *p4tc_pipeline_find_get(struct net *net, const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack) +{ + struct p4tc_pipeline *pipeline = + p4tc_pipeline_find_byany(net, p_name, pipeid, extack); + + if (IS_ERR(pipeline)) + return pipeline; + + if (!p4tc_pipeline_get(pipeline)) { + NL_SET_ERR_MSG(extack, "Pipeline is stale"); + return ERR_PTR(-EINVAL); + } + + return pipeline; +} +EXPORT_SYMBOL_GPL(p4tc_pipeline_find_get); + +void p4tc_pipeline_put(struct p4tc_pipeline *pipeline) +{ + __p4tc_pipeline_put(pipeline, &pipeline->common, NULL); +} +EXPORT_SYMBOL_GPL(p4tc_pipeline_put); + +struct p4tc_pipeline * +p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name, + const u32 pipeid, + struct netlink_ext_ack *extack) +{ + struct p4tc_pipeline *pipeline = + p4tc_pipeline_find_byany(net, p_name, pipeid, extack); + if (IS_ERR(pipeline)) + return pipeline; + + if (p4tc_pipeline_sealed(pipeline)) { + NL_SET_ERR_MSG(extack, "Pipeline is sealed"); + return ERR_PTR(-EINVAL); + } + + return pipeline; +} + +static struct p4tc_pipeline * +p4tc_pipeline_update(struct net *net, struct nlmsghdr *n, struct nlattr *nla, + const char *p_name, const u32 pipeid, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_PIPELINE_MAX + 1]; + struct p4tc_pipeline *pipeline; + u16 num_tables = 0; + int ret = 0; + + ret = nla_parse_nested(tb, P4TC_PIPELINE_MAX, nla, tc_pipeline_policy, + extack); + + if (ret < 0) + goto out; + + pipeline = + p4tc_pipeline_find_byany_unsealed(net, p_name, pipeid, extack); + if (IS_ERR(pipeline)) + return pipeline; + + if (tb[P4TC_PIPELINE_NUMTABLES]) + num_tables = nla_get_u16(tb[P4TC_PIPELINE_NUMTABLES]); + + if (tb[P4TC_PIPELINE_STATE]) { + ret = pipeline_try_set_state_ready(pipeline, extack); + if (ret < 0) + goto out; + } + + if (num_tables) + pipeline->num_tables = num_tables; + + return pipeline; + +out: + return ERR_PTR(ret); +} + +static struct p4tc_template_common * +p4tc_pipeline_cu(struct net *net, struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + u32 pipeid = ids[P4TC_PID_IDX]; + struct p4tc_pipeline *pipeline; + + switch (n->nlmsg_type) { + case RTM_CREATEP4TEMPLATE: + pipeline = p4tc_pipeline_create(net, n, nla, + nl_path_attrs->pname, + pipeid, extack); + break; + case RTM_UPDATEP4TEMPLATE: + pipeline = p4tc_pipeline_update(net, n, nla, + nl_path_attrs->pname, + pipeid, extack); + break; + default: + return ERR_PTR(-EOPNOTSUPP); + } + + if (IS_ERR(pipeline)) + goto out; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + +out: + return (struct p4tc_template_common *)pipeline; +} + +static int _p4tc_pipeline_fill_nlmsg(struct sk_buff *skb, + const struct p4tc_pipeline *pipeline) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct nlattr *nest; + + nest = nla_nest_start(skb, P4TC_PARAMS); + if (!nest) + goto out_nlmsg_trim; + if (nla_put_u16(skb, P4TC_PIPELINE_NUMTABLES, pipeline->num_tables)) + goto out_nlmsg_trim; + if (nla_put_u8(skb, P4TC_PIPELINE_STATE, pipeline->p_state)) + goto out_nlmsg_trim; + + nla_nest_end(skb, nest); + + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int p4tc_pipeline_fill_nlmsg(struct net *net, struct sk_buff *skb, + struct p4tc_template_common *template, + struct netlink_ext_ack *extack) +{ + const struct p4tc_pipeline *pipeline = to_pipeline(template); + + if (_p4tc_pipeline_fill_nlmsg(skb, pipeline) <= 0) { + NL_SET_ERR_MSG(extack, + "Failed to fill notification attributes for pipeline"); + return -EINVAL; + } + + return 0; +} + +static int p4tc_pipeline_del_one(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + /* User driven pipeline put doesn't transfer the lifetime + * of the pipeline to other ref holders. In case of unlocked + * table entries, it shall never teardown the pipeline so + * need to do an atomic transition here. + * + * System driven put will serialize with rtnl_lock and + * table entries are guaranteed to not be in flight. + */ + if (!refcount_dec_if_one(&pipeline->p_ctrl_ref)) { + NL_SET_ERR_MSG(extack, "Pipeline in use"); + return -EAGAIN; + } + + p4tc_pipeline_teardown(pipeline, extack); + + return 0; +} + +static int p4tc_pipeline_gd(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_template_common *tmpl; + struct p4tc_pipeline *pipeline; + u32 *ids = nl_path_attrs->ids; + u32 pipeid = ids[P4TC_PID_IDX]; + int ret = 0; + + if (n->nlmsg_type == RTM_DELP4TEMPLATE && + (n->nlmsg_flags & NLM_F_ROOT)) { + NL_SET_ERR_MSG(extack, "Pipeline flush not supported"); + return -EOPNOTSUPP; + } + + pipeline = p4tc_pipeline_find_byany(net, nl_path_attrs->pname, pipeid, + extack); + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + + tmpl = (struct p4tc_template_common *)pipeline; + if (p4tc_pipeline_fill_nlmsg(net, skb, tmpl, extack) < 0) + return -1; + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (n->nlmsg_type == RTM_DELP4TEMPLATE) { + ret = p4tc_pipeline_del_one(pipeline, extack); + if (ret < 0) + goto out_nlmsg_trim; + } + + return ret; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static int p4tc_pipeline_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct nlattr *nla, char **p_name, u32 *ids, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct p4tc_pipeline_net *pipe_net; + + pipe_net = net_generic(net, pipeline_net_id); + + return p4tc_tmpl_generic_dump(skb, ctx, &pipe_net->pipeline_idr, + P4TC_PID_IDX, extack); +} + +static int p4tc_pipeline_dump_1(struct sk_buff *skb, + struct p4tc_template_common *common) +{ + struct p4tc_pipeline *pipeline = to_pipeline(common); + unsigned char *b = nlmsg_get_pos(skb); + struct nlattr *param; + + /* Don't show kernel pipeline in dump */ + if (pipeline->common.p_id == P4TC_KERNEL_PIPEID) + return 1; + + param = nla_nest_start(skb, P4TC_PARAMS); + if (!param) + goto out_nlmsg_trim; + if (nla_put_string(skb, P4TC_PIPELINE_NAME, pipeline->common.name)) + goto out_nlmsg_trim; + + nla_nest_end(skb, param); + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -ENOMEM; +} + +static int register_pipeline_pernet(void) +{ + return register_pernet_subsys(&pipeline_net_ops); +} + +static void __p4tc_pipeline_init(void) +{ + int pipeid = P4TC_KERNEL_PIPEID; + + root_pipeline = kzalloc(sizeof(*root_pipeline), GFP_ATOMIC); + if (unlikely(!root_pipeline)) { + pr_err("Unable to register kernel pipeline\n"); + return; + } + + strscpy(root_pipeline->common.name, "kernel", P4TC_PIPELINE_NAMSIZ); + + root_pipeline->common.ops = + (struct p4tc_template_ops *)&p4tc_pipeline_ops; + + root_pipeline->common.p_id = pipeid; + + root_pipeline->p_state = P4TC_STATE_READY; +} + +static void p4tc_pipeline_init(void) +{ + if (register_pipeline_pernet() < 0) + pr_err("Failed to register per net pipeline IDR"); + + if (p4tc_register_types() < 0) + pr_err("Failed to register P4 types"); + + __p4tc_pipeline_init(); +} + +const struct p4tc_template_ops p4tc_pipeline_ops = { + .init = p4tc_pipeline_init, + .cu = p4tc_pipeline_cu, + .fill_nlmsg = p4tc_pipeline_fill_nlmsg, + .gd = p4tc_pipeline_gd, + .put = __p4tc_pipeline_put, + .dump = p4tc_pipeline_dump, + .dump_1 = p4tc_pipeline_dump_1, +}; diff --git a/net/sched/p4tc/p4tc_tmpl_api.c b/net/sched/p4tc/p4tc_tmpl_api.c new file mode 100644 index 000000000..d7b3b077c --- /dev/null +++ b/net/sched/p4tc/p4tc_tmpl_api.c @@ -0,0 +1,585 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_tmpl_api.c P4 TC TEMPLATE API + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static const struct nla_policy p4tc_root_policy[P4TC_ROOT_MAX + 1] = { + [P4TC_ROOT] = { .type = NLA_NESTED }, + [P4TC_ROOT_PNAME] = { .type = NLA_STRING, .len = P4TC_PIPELINE_NAMSIZ }, +}; + +static const struct nla_policy p4tc_policy[P4TC_MAX + 1] = { + [P4TC_PATH] = { .type = NLA_BINARY, + .len = P4TC_PATH_MAX * sizeof(u32) }, + [P4TC_PARAMS] = { .type = NLA_NESTED }, +}; + +static bool obj_is_valid(u32 obj) +{ + switch (obj) { + case P4TC_OBJ_PIPELINE: + return true; + default: + return false; + } +} + +static const struct p4tc_template_ops *p4tc_ops[P4TC_OBJ_MAX + 1] = { + [P4TC_OBJ_PIPELINE] = &p4tc_pipeline_ops, +}; + +int p4tc_tmpl_generic_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct idr *idr, int idx, + struct netlink_ext_ack *extack) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_template_common *common; + unsigned long id = 0; + unsigned long tmp; + int i = 0; + + id = ctx->ids[idx]; + + idr_for_each_entry_continue_ul(idr, common, tmp, id) { + struct nlattr *count; + int ret; + + if (i == P4TC_MSGBATCH_SIZE) + break; + + count = nla_nest_start(skb, i + 1); + if (!count) + goto out_nlmsg_trim; + ret = common->ops->dump_1(skb, common); + if (ret < 0) { + goto out_nlmsg_trim; + } else if (ret) { + nla_nest_cancel(skb, count); + continue; + } + nla_nest_end(skb, count); + + i++; + } + + if (i == 0) { + if (!ctx->ids[idx]) + NL_SET_ERR_MSG(extack, + "There are no pipeline components"); + return 0; + } + + ctx->ids[idx] = id; + + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -ENOMEM; +} + +static int tc_ctl_p4_tmpl_gd_1(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct nlattr *tb[P4TC_MAX + 1]; + struct p4tc_template_ops *op; + u32 ids[P4TC_PATH_MAX] = {}; + int ret; + + if (!obj_is_valid(t->obj)) { + NL_SET_ERR_MSG(extack, "Invalid object type"); + return -EINVAL; + } + + ret = nla_parse_nested(tb, P4TC_MAX, arg, p4tc_policy, extack); + if (ret < 0) + return ret; + + ids[P4TC_PID_IDX] = t->pipeid; + + nl_path_attrs->ids = ids; + + op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; + + ret = op->gd(net, skb, n, tb[P4TC_PARAMS], nl_path_attrs, extack); + if (ret < 0) + return ret; + + if (!t->pipeid) + t->pipeid = ids[P4TC_PID_IDX]; + + return ret; +} + +static int tc_ctl_p4_tmpl_gd_n(struct sk_buff *skb, struct nlmsghdr *n, + char *p_name, struct nlattr *nla, int event, + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct p4tc_path_nlattrs nl_path_attrs = {0}; + struct nlattr *tb[P4TC_MSGBATCH_SIZE + 1]; + struct net *net = sock_net(skb->sk); + u32 portid = NETLINK_CB(skb).portid; + struct p4tcmsg *t_new; + struct sk_buff *nskb; + struct nlmsghdr *nlh; + struct nlattr *pnatt; + struct nlattr *root; + int ret = 0; + int i; + + ret = nla_parse_nested(tb, P4TC_MSGBATCH_SIZE, nla, NULL, extack); + if (ret < 0) + return ret; + + nskb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!nskb) + return -ENOMEM; + + nlh = nlmsg_put(nskb, portid, n->nlmsg_seq, event, sizeof(*t), + n->nlmsg_flags); + if (!nlh) { + ret = -ENOMEM; + goto out; + } + + t_new = nlmsg_data(nlh); + t_new->pipeid = t->pipeid; + t_new->obj = t->obj; + + pnatt = nla_reserve(nskb, P4TC_ROOT_PNAME, P4TC_PIPELINE_NAMSIZ); + if (!pnatt) { + ret = -ENOMEM; + goto out; + } + + nl_path_attrs.pname = nla_data(pnatt); + if (!p_name) { + /* Filled up by the operation or forced failure */ + memset(nl_path_attrs.pname, 0, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = false; + } else { + strscpy(nl_path_attrs.pname, p_name, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = true; + } + + root = nla_nest_start(nskb, P4TC_ROOT); + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && tb[i]; i++) { + struct nlattr *nest = nla_nest_start(nskb, i); + + ret = tc_ctl_p4_tmpl_gd_1(net, nskb, nlh, tb[i], &nl_path_attrs, + extack); + if (n->nlmsg_flags & NLM_F_ROOT && event == RTM_DELP4TEMPLATE) { + if (ret <= 0) + goto out; + } else { + if (ret < 0) + goto out; + } + nla_nest_end(nskb, nest); + } + nla_nest_end(nskb, root); + + nlmsg_end(nskb, nlh); + + if (event == RTM_GETP4TEMPLATE) + return rtnl_unicast(nskb, net, portid); + + return rtnetlink_send(nskb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); +out: + kfree_skb(nskb); + return ret; +} + +static int tc_ctl_p4_tmpl_get(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + int ret; + + ret = nlmsg_parse(n, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(extack, + "Netlink P4TC template attributes missing"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + return tc_ctl_p4_tmpl_gd_n(skb, n, p_name, tb[P4TC_ROOT], + RTM_GETP4TEMPLATE, extack); +} + +static int tc_ctl_p4_tmpl_delete(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + int ret; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = nlmsg_parse(n, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(extack, + "Netlink P4TC template attributes missing"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + return tc_ctl_p4_tmpl_gd_n(skb, n, p_name, tb[P4TC_ROOT], + RTM_DELP4TEMPLATE, extack); +} + +static int p4tc_template_put(struct net *net, + struct p4tc_template_common *common, + struct netlink_ext_ack *extack) +{ + /* Every created template is bound to a pipeline */ + struct p4tc_pipeline *pipeline = + p4tc_pipeline_find_byid(net, common->p_id); + return common->ops->put(pipeline, common, extack); +} + +static struct p4tc_template_common * +p4tc_tmpl_cu_1(struct sk_buff *skb, struct net *net, struct nlmsghdr *n, + struct p4tc_path_nlattrs *nl_path_attrs, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct p4tc_template_common *tmpl; + struct nlattr *tb[P4TC_MAX + 1]; + struct p4tc_template_ops *op; + u32 ids[P4TC_PATH_MAX] = {}; + int ret; + + if (!obj_is_valid(t->obj)) { + NL_SET_ERR_MSG(extack, "Invalid object type"); + ret = -EINVAL; + goto out; + } + + ret = nla_parse_nested(tb, P4TC_MAX, nla, p4tc_policy, extack); + if (ret < 0) + goto out; + + if (NL_REQ_ATTR_CHECK(extack, nla, tb, P4TC_PARAMS)) { + NL_SET_ERR_MSG(extack, "Must specify object attributes"); + ret = -EINVAL; + goto out; + } + + ids[P4TC_PID_IDX] = t->pipeid; + nl_path_attrs->ids = ids; + + op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; + tmpl = op->cu(net, n, tb[P4TC_PARAMS], nl_path_attrs, extack); + if (IS_ERR(tmpl)) + return tmpl; + + ret = op->fill_nlmsg(net, skb, tmpl, extack); + if (ret < 0) + goto put; + + if (!t->pipeid) + t->pipeid = ids[P4TC_PID_IDX]; + + return tmpl; + +put: + p4tc_template_put(net, tmpl, extack); + +out: + return ERR_PTR(ret); +} + +static int p4tc_tmpl_cu_n(struct sk_buff *skb, struct nlmsghdr *n, + struct nlattr *nla, char *p_name, + struct netlink_ext_ack *extack) +{ + struct p4tc_template_common *tmpls[P4TC_MSGBATCH_SIZE]; + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct nlattr *tb[P4TC_MSGBATCH_SIZE + 1]; + bool update = p4tc_tmpl_msg_is_update(n); + struct net *net = sock_net(skb->sk); + u32 portid = NETLINK_CB(skb).portid; + struct p4tc_path_nlattrs nl_path_attrs; + struct p4tcmsg *t_new; + struct sk_buff *nskb; + struct nlmsghdr *nlh; + struct nlattr *pnatt; + struct nlattr *root; + int ret; + int i; + + ret = nla_parse_nested(tb, P4TC_MSGBATCH_SIZE, nla, NULL, extack); + if (ret < 0) + return ret; + + nskb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!nskb) + return -ENOMEM; + + nlh = nlmsg_put(nskb, portid, n->nlmsg_seq, n->nlmsg_type, + sizeof(*t), n->nlmsg_flags); + if (!nlh) + goto out; + + t_new = nlmsg_data(nlh); + if (!t_new) { + NL_SET_ERR_MSG(extack, "Message header is missing"); + ret = -EINVAL; + goto out; + } + t_new->pipeid = t->pipeid; + t_new->obj = t->obj; + + pnatt = nla_reserve(nskb, P4TC_ROOT_PNAME, P4TC_PIPELINE_NAMSIZ); + if (!pnatt) { + ret = -ENOMEM; + goto out; + } + + nl_path_attrs.pname = nla_data(pnatt); + if (!p_name) { + /* Filled up by the operation or forced failure */ + memset(nl_path_attrs.pname, 0, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = false; + } else { + strscpy(nl_path_attrs.pname, p_name, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = true; + } + + root = nla_nest_start(nskb, P4TC_ROOT); + if (!root) { + ret = -ENOMEM; + goto out; + } + + for (i = 0; i < P4TC_MSGBATCH_SIZE && tb[i + 1]; i++) { + struct nlattr *nest = nla_nest_start(nskb, i + 1); + + tmpls[i] = p4tc_tmpl_cu_1(nskb, net, nlh, &nl_path_attrs, + tb[i + 1], extack); + if (IS_ERR(tmpls[i])) { + ret = PTR_ERR(tmpls[i]); + if (i > 0 && update) { + nla_nest_cancel(nskb, nest); + goto nest_end_root; + } + goto undo_prev; + } + + nla_nest_end(nskb, nest); + } +nest_end_root: + nla_nest_end(nskb, root); + + if (!t_new->pipeid) + t_new->pipeid = ret; + + nlmsg_end(nskb, nlh); + + return rtnetlink_send(nskb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + +undo_prev: + if (!update) { + while (--i > 0) { + struct p4tc_template_common *tmpl = tmpls[i - 1]; + + p4tc_template_put(net, tmpl, extack); + } + } + +out: + kfree_skb(nskb); + return ret; +} + +static int tc_ctl_p4_tmpl_cu(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + int ret = 0; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = nlmsg_parse(n, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(extack, + "Netlink P4TC template attributes missing"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + return p4tc_tmpl_cu_n(skb, n, tb[P4TC_ROOT], p_name, extack); +} + +static int tc_ctl_p4_tmpl_dump_1(struct sk_buff *skb, struct nlattr *arg, + char *p_name, struct netlink_callback *cb) +{ + struct p4tc_dump_ctx *ctx = (void *)cb->ctx; + struct netlink_ext_ack *extack = cb->extack; + u32 portid = NETLINK_CB(cb->skb).portid; + const struct nlmsghdr *n = cb->nlh; + struct nlattr *tb[P4TC_MAX + 1]; + struct p4tc_template_ops *op; + u32 ids[P4TC_PATH_MAX] = {}; + struct p4tcmsg *t_new; + struct nlmsghdr *nlh; + struct nlattr *root; + struct p4tcmsg *t; + int ret; + + ret = nla_parse_nested_deprecated(tb, P4TC_MAX, arg, p4tc_policy, + extack); + if (ret < 0) + return ret; + + t = (struct p4tcmsg *)nlmsg_data(n); + if (!obj_is_valid(t->obj)) { + NL_SET_ERR_MSG(extack, "Invalid object type"); + return -EINVAL; + } + + nlh = nlmsg_put(skb, portid, n->nlmsg_seq, n->nlmsg_type, + sizeof(*t), n->nlmsg_flags); + if (!nlh) + return -ENOSPC; + + t_new = nlmsg_data(nlh); + t_new->pipeid = t->pipeid; + t_new->obj = t->obj; + + root = nla_nest_start(skb, P4TC_ROOT); + + ids[P4TC_PID_IDX] = t->pipeid; + + op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; + ret = op->dump(skb, ctx, tb[P4TC_PARAMS], &p_name, ids, extack); + if (ret <= 0) + goto out; + nla_nest_end(skb, root); + + if (p_name) { + if (nla_put_string(skb, P4TC_ROOT_PNAME, p_name)) { + ret = -1; + goto out; + } + } + + if (!t_new->pipeid) + t_new->pipeid = ids[P4TC_PID_IDX]; + + nlmsg_end(skb, nlh); + + return ret; + +out: + nlmsg_cancel(skb, nlh); + return ret; +} + +static int tc_ctl_p4_tmpl_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + int ret; + + ret = nlmsg_parse(cb->nlh, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, cb->extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(cb->extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(cb->extack, + "Netlink P4TC template attributes missing"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + return tc_ctl_p4_tmpl_dump_1(skb, tb[P4TC_ROOT], p_name, cb); +} + +static int __init p4tc_template_init(void) +{ + u32 obj_id; + + rtnl_register(PF_UNSPEC, RTM_CREATEP4TEMPLATE, tc_ctl_p4_tmpl_cu, NULL, + 0); + rtnl_register(PF_UNSPEC, RTM_UPDATEP4TEMPLATE, tc_ctl_p4_tmpl_cu, NULL, + 0); + rtnl_register(PF_UNSPEC, RTM_DELP4TEMPLATE, tc_ctl_p4_tmpl_delete, NULL, + 0); + rtnl_register(PF_UNSPEC, RTM_GETP4TEMPLATE, tc_ctl_p4_tmpl_get, + tc_ctl_p4_tmpl_dump, 0); + + for (obj_id = P4TC_OBJ_PIPELINE; obj_id < P4TC_OBJ_MAX + 1; obj_id++) { + const struct p4tc_template_ops *op = p4tc_ops[obj_id]; + + if (!op) + continue; + + if (!obj_is_valid(obj_id)) + continue; + + if (op->init) + op->init(); + } + + return 0; +} + +subsys_initcall(p4tc_template_init); diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c index 8ff670cf1..e50a1c1ff 100644 --- a/security/selinux/nlmsgtab.c +++ b/security/selinux/nlmsgtab.c @@ -94,6 +94,10 @@ static const struct nlmsg_perm nlmsg_route_perms[] = { { RTM_NEWTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_DELTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_GETTUNNEL, NETLINK_ROUTE_SOCKET__NLMSG_READ }, + { RTM_CREATEP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, + { RTM_DELP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, + { RTM_GETP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, + { RTM_UPDATEP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, }; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:21 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 10/15] p4tc: add action template create, update, delete, get, flush and dump Date: Fri, 1 Dec 2023 13:28:59 -0500 Message-Id: <20231201182904.532825-11-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This commit allows the control plane to create, update, delete, get, flush and dump action templates based on P4 action definitions. Visualize the following action in a P4 program named aP4Proggie: action send_nh(@tc_type("macaddr) bit<48> dstAddr, @tc_type("dev") bit<8> port) { hdr.ethernet.dstAddr = dstMac; send_to_port(port); } The above is an action called send_nh which receives as parameters a bit<48> dstAddr (a mac address) and a bit<8> port (something close to ifindex). which is applied on a P4 table match as such: table mytable { key = { hdr.ipv4.dstAddr @tc_type("ipv4"): lpm; } actions = { send_nh; drop; NoAction; } size = 1024; } The mechanics of actions follow the CRUD semantics. ___P4 ACTION KIND CREATION___ In this stage we create the p4 action kind by specifying the action name, its ID, its parameters and the parameter types. So for the send_nh action, the creation would look something like this: tc p4template create action/aP4proggie/send_nh \ param dstAddr type macaddr id 1 param port type dev id 2 All the template commands (tc p4template) are generated by the p4c compiler (but of course could be hand coded by humans). Also note that an action name has to specify the program name since P4 actions are unique to a program. As an example, the above command creates an action template that is bounded to pipeline/program named "aP4proggie". Note2: In P4, actions are assumed to pre-exist and have an upper bound number of instances. Typically, if you have a max of 1024 "mytable" table entries you want to allocate enough action instances to cover the 1024 entries. However, this is a big waste of memory when we have low table occupancy. We pick a middle ground by providing pre-allocation control via attribute "num_prealloc". The compiler generated template does not specify it and by default we preallocate 16 entries. The user can override this value by editing the generated text, for example to change the number to 128 as such: tc p4template create action/aP4proggie/send_nh num_prealloc 128 \ param dstAddr type macaddr id 1 param port type dev id 2 When all preallocated action instances are exhausted (used in table entries) then the behavior switches to the current tc action approach i.e for every table entry created a new action instance is dynamically allocated. Once an instance is created it is added to the pool and never freed. Note, Current tc action behavior is maintained: a) If the user wishes to preallocate more actions instance later at runtime to take advantage of a faster table entry creation (by avoiding dynamic allocation at table entry creation time), they will have to individually create actions via the control plane using the classical "tc actions" command. For example: tc actions add action aP4proggie/send_nh \ param dstAddr AA:BB:CC:DD:EE:DD param port eth1 The action is added to the pool of action aP4proggie/send_nh instances and any table entry creation will grab it. The parameters specified above will be replaced when the table entry is created. b) Sharing of action instances works the same way (i.e you could autobind to any action instance in a table entry creation by specifying the action "index". ___ACTION KIND ACTIVATION___ Once we provided all the necessary information for the new p4 action, we can go to the final stage: action activation. In this stage, we activate the p4 action and make it available for instantiation. To activate the action template, we issue the following command: tc p4template update action/aP4proggie/send_nh state active After the above the command, the action is ready to be instantiated. ___OTHER CONTROL COMMANDS___ The lifetime of the p4 action is tied to its pipeline (see earlier patches). As with all pipeline components, write operations to action templates, such as create, update and delete, can only be executed if the pipeline is not sealed. Read/get can be issued even after the pipeline is sealed. If, after we are done with our action template we want to delete it, we could issue the following command: tc p4template del action/aP4proggie/send_nh Note: If any instance was created for this action (as illustrated earlier) than this action cannot be deleted, unless you delete all instances first. If we had created more action templates and wanted to flush all of the action templates from pipeline aP4proggie, one would use the following command: tc p4template del action/aP4proggie/ After creating or updating a p4 actions, if one wishes to verify that the p4 action was created correctly, one would use the following command: tc p4template get action/aP4proggie/send_nh The above command will display the relevant data for the action, such as parameter names, types, etc. If one wanted to check which action templates were associated to a specific pipeline, one could use the following command: tc p4template get action/aP4proggie/ Note that this command will only display the name of these action templates. To verify their specific details, one should use the get command, which was previously described. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/act_api.h | 1 + include/net/p4tc.h | 79 ++- include/net/tc_act/p4tc.h | 28 + include/uapi/linux/p4tc.h | 54 ++ include/uapi/linux/tc_act/tc_p4.h | 11 + net/sched/p4tc/Makefile | 3 +- net/sched/p4tc/p4tc_action.c | 1081 +++++++++++++++++++++++++++++ net/sched/p4tc/p4tc_pipeline.c | 16 +- net/sched/p4tc/p4tc_tmpl_api.c | 18 + 9 files changed, 1280 insertions(+), 11 deletions(-) create mode 100644 include/net/tc_act/p4tc.h create mode 100644 include/uapi/linux/tc_act/tc_p4.h create mode 100644 net/sched/p4tc/p4tc_action.c diff --git a/include/net/act_api.h b/include/net/act_api.h index 4b719da7d..6aee50e27 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -70,6 +70,7 @@ struct tc_action { #define TCA_ACT_FLAGS_AT_INGRESS (1U << (TCA_ACT_FLAGS_USER_BITS + 4)) #define TCA_ACT_FLAGS_PREALLOC (1U << (TCA_ACT_FLAGS_USER_BITS + 5)) #define TCA_ACT_FLAGS_UNREFERENCED (1U << (TCA_ACT_FLAGS_USER_BITS + 6)) +#define TCA_ACT_FLAGS_FROM_P4TC (1U << (TCA_ACT_FLAGS_USER_BITS + 7)) /* Update lastuse only if needed, to avoid dirtying a cache line. * We use a temp variable to avoid fetching jiffies twice. diff --git a/include/net/p4tc.h b/include/net/p4tc.h index 25f7eb322..9dfb1d4a7 100644 --- a/include/net/p4tc.h +++ b/include/net/p4tc.h @@ -9,17 +9,23 @@ #include #include #include +#include +#include #define P4TC_DEFAULT_NUM_TABLES P4TC_MINTABLES_COUNT #define P4TC_DEFAULT_MAX_RULES 1 #define P4TC_PATH_MAX 3 +#define P4TC_MAX_TENTRIES 0x2000000 #define P4TC_KERNEL_PIPEID 0 #define P4TC_PID_IDX 0 +#define P4TC_AID_IDX 1 +#define P4TC_PARSEID_IDX 1 struct p4tc_dump_ctx { u32 ids[P4TC_PATH_MAX]; + struct rhashtable_iter *iter; }; struct p4tc_template_common; @@ -63,8 +69,10 @@ extern const struct p4tc_template_ops p4tc_pipeline_ops; struct p4tc_pipeline { struct p4tc_template_common common; + struct idr p_act_idr; struct rcu_head rcu; struct net *net; + u32 num_created_acts; /* Accounts for how many entities are referencing this pipeline. * As for now only P4 filters can refer to pipelines. */ @@ -109,18 +117,73 @@ p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name, const u32 pipeid, struct netlink_ext_ack *extack); -static inline int p4tc_action_destroy(struct tc_action **acts) -{ - int ret = 0; +struct p4tc_act_param { + struct list_head head; + struct rcu_head rcu; + void *value; + void *mask; + struct p4tc_type *type; + u32 id; + u32 index; + u16 bitend; + u8 flags; + u8 PAD0; + char name[P4TC_ACT_PARAM_NAMSIZ]; +}; + +struct p4tc_act_param_ops { + int (*init_value)(struct net *net, struct p4tc_act_param_ops *op, + struct p4tc_act_param *nparam, struct nlattr **tb, + struct netlink_ext_ack *extack); + int (*dump_value)(struct sk_buff *skb, struct p4tc_act_param_ops *op, + struct p4tc_act_param *param); + void (*free)(struct p4tc_act_param *param); + u32 len; + u32 alloc_len; +}; + +struct p4tc_act { + struct p4tc_template_common common; + struct tc_action_ops ops; + struct tc_action_net *tn; + struct p4tc_pipeline *pipeline; + struct idr params_idr; + struct tcf_exts exts; + struct list_head head; + struct list_head prealloc_list; + /* Locks the preallocated actions list. + * The list will be used whenever a table entry with an action or a + * table default action gets created, updated or deleted. Note that + * table entries may be added by both control and data path, so the + * list can be modified from both contexts. + */ + spinlock_t list_lock; + u32 a_id; + u32 num_params; + u32 num_prealloc_acts; + /* Accounts for how many entities refer to this action. Usually just the + * pipeline it belongs to. + */ + refcount_t a_ref; + bool active; + char fullname[ACTNAMSIZ]; +}; + +extern const struct p4tc_template_ops p4tc_act_ops; - if (acts) { - ret = tcf_action_destroy(acts, TCA_ACT_UNBIND); - kfree(acts); - } +struct p4tc_act *p4a_tmpl_get(struct p4tc_pipeline *pipeline, + const char *act_name, const u32 a_id, + struct netlink_ext_ack *extack); +struct p4tc_act *p4a_tmpl_find_byid(struct p4tc_pipeline *pipeline, + const u32 a_id); - return ret; +static inline bool p4tc_action_put_ref(struct p4tc_act *act) +{ + return refcount_dec_not_one(&act->a_ref); } #define to_pipeline(t) ((struct p4tc_pipeline *)t) +#define to_hdrfield(t) ((struct p4tc_hdrfield *)t) +#define p4tc_to_act(t) ((struct p4tc_act *)t) #endif diff --git a/include/net/tc_act/p4tc.h b/include/net/tc_act/p4tc.h new file mode 100644 index 000000000..6447fe5ce --- /dev/null +++ b/include/net/tc_act/p4tc.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NET_TC_ACT_P4_H +#define __NET_TC_ACT_P4_H + +#include +#include + +struct tcf_p4act_params { + struct tcf_exts exts; + struct idr params_idr; + struct p4tc_act_param **params_array; + struct rcu_head rcu; + u32 num_params; + u32 tot_params_sz; +}; + +struct tcf_p4act { + struct tc_action common; + /* Params IDR reference passed during runtime */ + struct tcf_p4act_params __rcu *params; + u32 p_id; + u32 act_id; + struct list_head node; +}; + +#define to_p4act(a) ((struct tcf_p4act *)a) + +#endif /* __NET_TC_ACT_P4_H */ diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h index 382542e83..f52e826bd 100644 --- a/include/uapi/linux/p4tc.h +++ b/include/uapi/linux/p4tc.h @@ -4,6 +4,9 @@ #include #include +#include + +#include /* pipeline header */ struct p4tcmsg { @@ -17,9 +20,12 @@ struct p4tcmsg { #define P4TC_MSGBATCH_SIZE 16 #define P4TC_MAX_KEYSZ 512 +#define P4TC_DEFAULT_NUM_PREALLOC 16 #define P4TC_TMPL_NAMSZ 32 #define P4TC_PIPELINE_NAMSIZ P4TC_TMPL_NAMSZ +#define P4TC_ACT_TMPL_NAMSZ P4TC_TMPL_NAMSZ +#define P4TC_ACT_PARAM_NAMSIZ P4TC_TMPL_NAMSZ /* Root attributes */ enum { @@ -35,6 +41,7 @@ enum { enum { P4TC_OBJ_UNSPEC, P4TC_OBJ_PIPELINE, + P4TC_OBJ_ACT, __P4TC_OBJ_MAX, }; @@ -45,6 +52,7 @@ enum { P4TC_UNSPEC, P4TC_PATH, P4TC_PARAMS, + P4TC_COUNT, __P4TC_MAX, }; @@ -93,6 +101,52 @@ enum { #define P4TC_T_MAX (__P4TC_T_MAX - 1) +/* Action attributes */ +enum { + P4TC_ACT_UNSPEC, + P4TC_ACT_NAME, /* string */ + P4TC_ACT_PARMS, /* nested params */ + P4TC_ACT_OPT, /* action opt */ + P4TC_ACT_TM, /* action tm */ + P4TC_ACT_ACTIVE, /* u8 */ + P4TC_ACT_NUM_PREALLOC, /* u32 num preallocated action instances */ + P4TC_ACT_PAD, + __P4TC_ACT_MAX +}; + +#define P4TC_ACT_MAX (__P4TC_ACT_MAX - 1) + +/* Action params attributes */ +enum { + P4TC_ACT_PARAMS_VALUE_UNSPEC, + P4TC_ACT_PARAMS_VALUE_RAW, /* binary */ + __P4TC_ACT_PARAMS_VALUE_MAX +}; + +#define P4TC_ACT_VALUE_PARAMS_MAX (__P4TC_ACT_PARAMS_VALUE_MAX - 1) + +enum { + P4TC_ACT_PARAMS_TYPE_UNSPEC, + P4TC_ACT_PARAMS_TYPE_BITEND, /* u16 */ + P4TC_ACT_PARAMS_TYPE_CONTAINER_ID, /* u32 */ + __P4TC_ACT_PARAMS_TYPE_MAX +}; + +#define P4TC_ACT_PARAMS_TYPE_MAX (__P4TC_ACT_PARAMS_TYPE_MAX - 1) + +/* Action params attributes */ +enum { + P4TC_ACT_PARAMS_UNSPEC, + P4TC_ACT_PARAMS_NAME, /* string */ + P4TC_ACT_PARAMS_ID, /* u32 */ + P4TC_ACT_PARAMS_VALUE, /* bytes */ + P4TC_ACT_PARAMS_MASK, /* bytes */ + P4TC_ACT_PARAMS_TYPE, /* nested type */ + __P4TC_ACT_PARAMS_MAX +}; + +#define P4TC_ACT_PARAMS_MAX (__P4TC_ACT_PARAMS_MAX - 1) + #define P4TC_RTA(r) \ ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct p4tcmsg)))) diff --git a/include/uapi/linux/tc_act/tc_p4.h b/include/uapi/linux/tc_act/tc_p4.h new file mode 100644 index 000000000..874d85c9f --- /dev/null +++ b/include/uapi/linux/tc_act/tc_p4.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef __LINUX_TC_P4_H +#define __LINUX_TC_P4_H + +#include + +struct tc_act_p4 { + tc_gen; +}; + +#endif diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index 0881a7563..7dbcf8915 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 -obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o +obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o \ + p4tc_action.o diff --git a/net/sched/p4tc/p4tc_action.c b/net/sched/p4tc/p4tc_action.c new file mode 100644 index 000000000..6a4310c01 --- /dev/null +++ b/net/sched/p4tc/p4tc_action.c @@ -0,0 +1,1081 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_action.c P4 TC ACTION TEMPLATES + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void p4a_parm_put(struct p4tc_act_param *param) +{ + kfree(param); +} + +static const struct nla_policy p4a_parm_policy[P4TC_ACT_PARAMS_MAX + 1] = { + [P4TC_ACT_PARAMS_NAME] = { + .type = NLA_STRING, + .len = P4TC_ACT_PARAM_NAMSIZ + }, + [P4TC_ACT_PARAMS_ID] = { .type = NLA_U32 }, + [P4TC_ACT_PARAMS_VALUE] = { .type = NLA_NESTED }, + [P4TC_ACT_PARAMS_MASK] = { .type = NLA_BINARY }, + [P4TC_ACT_PARAMS_TYPE] = { .type = NLA_NESTED }, +}; + +static struct p4tc_act_param * +p4a_parm_find_byname(struct idr *params_idr, const char *param_name) +{ + struct p4tc_act_param *param; + unsigned long tmp, id; + + idr_for_each_entry_ul(params_idr, param, tmp, id) { + if (param == ERR_PTR(-EBUSY)) + continue; + if (strncmp(param->name, param_name, + P4TC_ACT_PARAM_NAMSIZ) == 0) + return param; + } + + return NULL; +} + +static struct p4tc_act_param * +p4a_parm_find_byid(struct idr *params_idr, const u32 param_id) +{ + return idr_find(params_idr, param_id); +} + +static struct p4tc_act_param * +p4a_parm_find_byany(struct p4tc_act *act, const char *param_name, + const u32 param_id, struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *param; + int err; + + if (param_id) { + param = p4a_parm_find_byid(&act->params_idr, param_id); + if (!param) { + NL_SET_ERR_MSG(extack, "Unable to find param by id"); + err = -EINVAL; + goto out; + } + } else { + if (param_name) { + param = p4a_parm_find_byname(&act->params_idr, + param_name); + if (!param) { + NL_SET_ERR_MSG(extack, "Param name not found"); + err = -EINVAL; + goto out; + } + } else { + NL_SET_ERR_MSG(extack, "Must specify param name or id"); + err = -EINVAL; + goto out; + } + } + + return param; + +out: + return ERR_PTR(err); +} + +static struct p4tc_act_param * +p4a_parm_find_byanyattr(struct p4tc_act *act, struct nlattr *name_attr, + const u32 param_id, + struct netlink_ext_ack *extack) +{ + char *param_name = NULL; + + if (name_attr) + param_name = nla_data(name_attr); + + return p4a_parm_find_byany(act, param_name, param_id, extack); +} + +static const struct nla_policy p4a_parm_type_policy[P4TC_ACT_PARAMS_TYPE_MAX + 1] = { + [P4TC_ACT_PARAMS_TYPE_BITEND] = { .type = NLA_U16 }, + [P4TC_ACT_PARAMS_TYPE_CONTAINER_ID] = { .type = NLA_U32 }, +}; + +static int +__p4a_parm_init_type(struct p4tc_act_param *param, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ACT_PARAMS_TYPE_MAX + 1]; + struct p4tc_type *type; + u32 container_id; + u16 bitend; + int ret; + + ret = nla_parse_nested(tb, P4TC_ACT_PARAMS_TYPE_MAX, nla, + p4a_parm_type_policy, extack); + if (ret < 0) + return ret; + + if (tb[P4TC_ACT_PARAMS_TYPE_CONTAINER_ID]) { + container_id = + nla_get_u32(tb[P4TC_ACT_PARAMS_TYPE_CONTAINER_ID]); + + type = p4type_find_byid(container_id); + if (!type) { + NL_SET_ERR_MSG_FMT(extack, + "Invalid container type id %u\n", + container_id); + return -EINVAL; + } + } else { + NL_SET_ERR_MSG(extack, "Must specify type container id"); + return -EINVAL; + } + + if (tb[P4TC_ACT_PARAMS_TYPE_BITEND]) { + bitend = nla_get_u16(tb[P4TC_ACT_PARAMS_TYPE_BITEND]); + } else { + NL_SET_ERR_MSG(extack, "Must specify bitend"); + return -EINVAL; + } + + param->type = type; + param->bitend = bitend; + + return 0; +} + +static struct p4tc_act * +p4a_tmpl_find_byname(const char *fullname, struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + unsigned long tmp, id; + struct p4tc_act *act; + + idr_for_each_entry_ul(&pipeline->p_act_idr, act, tmp, id) + if (strncmp(act->fullname, fullname, ACTNAMSIZ) == 0) + return act; + + return NULL; +} + +static int p4a_parm_type_fill(struct sk_buff *skb, struct p4tc_act_param *param) +{ + unsigned char *b = nlmsg_get_pos(skb); + + if (nla_put_u16(skb, P4TC_ACT_PARAMS_TYPE_BITEND, param->bitend)) + goto nla_put_failure; + + if (nla_put_u32(skb, P4TC_ACT_PARAMS_TYPE_CONTAINER_ID, + param->type->typeid)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +struct p4tc_act *p4a_tmpl_find_byid(struct p4tc_pipeline *pipeline, + const u32 a_id) +{ + return idr_find(&pipeline->p_act_idr, a_id); +} + +static struct p4tc_act * +p4a_tmpl_find_byany(struct p4tc_pipeline *pipeline, + const char *act_name, const u32 a_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_act *act; + int err; + + if (a_id) { + act = p4a_tmpl_find_byid(pipeline, a_id); + if (!act) { + NL_SET_ERR_MSG(extack, "Unable to find action by id"); + err = -ENOENT; + goto out; + } + } else { + if (act_name) { + act = p4a_tmpl_find_byname(act_name, pipeline, + extack); + if (!act) { + NL_SET_ERR_MSG(extack, "Action name not found"); + err = -ENOENT; + goto out; + } + } else { + NL_SET_ERR_MSG(extack, + "Must specify action name or id"); + err = -EINVAL; + goto out; + } + } + + return act; + +out: + return ERR_PTR(err); +} + +struct p4tc_act *p4a_tmpl_get(struct p4tc_pipeline *pipeline, + const char *act_name, const u32 a_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_act *act; + + act = p4a_tmpl_find_byany(pipeline, act_name, a_id, extack); + if (IS_ERR(act)) + return act; + + if (!refcount_inc_not_zero(&act->a_ref)) { + NL_SET_ERR_MSG(extack, "Action is stale"); + return ERR_PTR(-EBUSY); + } + + return act; +} + +static struct p4tc_act * +p4a_tmpl_find_byanyattr(struct nlattr *attr, const u32 a_id, + struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + char fullname[ACTNAMSIZ] = {}; + char *actname = NULL; + + if (attr) { + actname = nla_data(attr); + + snprintf(fullname, ACTNAMSIZ, "%s/%s", pipeline->common.name, + actname); + } + + return p4a_tmpl_find_byany(pipeline, fullname, a_id, extack); +} + +static void p4a_tmpl_parms_put_many(struct idr *params_idr) +{ + struct p4tc_act_param *param; + unsigned long tmp, id; + + idr_for_each_entry_ul(params_idr, param, tmp, id) + p4a_parm_put(param); +} + +static int +p4a_parm_init_type(struct p4tc_act_param *param, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct p4tc_type *type; + int ret; + + ret = __p4a_parm_init_type(param, nla, extack); + if (ret < 0) + return ret; + + type = param->type; + ret = type->ops->validate_p4t(type, NULL, 0, param->bitend, extack); + if (ret < 0) + return ret; + + return 0; +} + +static struct p4tc_act_param * +p4a_tmpl_parm_create(struct p4tc_act *act, struct idr *params_idr, + struct nlattr **tb, u32 param_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *param; + char *name; + int ret; + + if (tb[P4TC_ACT_PARAMS_NAME]) { + name = nla_data(tb[P4TC_ACT_PARAMS_NAME]); + } else { + NL_SET_ERR_MSG(extack, "Must specify param name"); + ret = -EINVAL; + goto out; + } + + param = kzalloc(sizeof(*param), GFP_KERNEL); + if (!param) { + ret = -ENOMEM; + goto out; + } + + if (p4a_parm_find_byid(&act->params_idr, param_id) || + p4a_parm_find_byname(&act->params_idr, name)) { + NL_SET_ERR_MSG(extack, "Param already exists"); + ret = -EEXIST; + goto free; + } + + if (tb[P4TC_ACT_PARAMS_TYPE]) { + ret = p4a_parm_init_type(param, tb[P4TC_ACT_PARAMS_TYPE], + extack); + if (ret < 0) + goto free; + } else { + NL_SET_ERR_MSG(extack, "Must specify param type"); + ret = -EINVAL; + goto free; + } + + if (param_id) { + ret = idr_alloc_u32(params_idr, param, ¶m_id, + param_id, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate param id"); + goto free; + } + param->id = param_id; + } else { + param->id = 1; + + ret = idr_alloc_u32(params_idr, param, ¶m->id, + UINT_MAX, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate param id"); + goto free; + } + } + + strscpy(param->name, name, P4TC_ACT_PARAM_NAMSIZ); + + return param; + +free: + kfree(param); + +out: + return ERR_PTR(ret); +} + +static struct p4tc_act_param * +p4a_tmpl_parm_update(struct p4tc_act *act, struct nlattr **tb, + struct idr *params_idr, u32 param_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *param_old, *param; + int ret; + + param_old = p4a_parm_find_byanyattr(act, tb[P4TC_ACT_PARAMS_NAME], + param_id, extack); + if (IS_ERR(param_old)) + return param_old; + + param = kzalloc(sizeof(*param), GFP_KERNEL); + if (!param) { + ret = -ENOMEM; + goto out; + } + + strscpy(param->name, param_old->name, P4TC_ACT_PARAM_NAMSIZ); + param->id = param_old->id; + + if (tb[P4TC_ACT_PARAMS_TYPE]) { + ret = p4a_parm_init_type(param, tb[P4TC_ACT_PARAMS_TYPE], + extack); + if (ret < 0) + goto free; + } else { + NL_SET_ERR_MSG(extack, "Must specify param type"); + ret = -EINVAL; + goto free; + } + + ret = idr_alloc_u32(params_idr, param, ¶m->id, + param->id, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate param id"); + goto free; + } + + return param; + +free: + kfree(param); +out: + return ERR_PTR(ret); +} + +static struct p4tc_act_param * +p4a_tmpl_parm_init(struct p4tc_act *act, struct nlattr *nla, + struct idr *params_idr, bool update, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ACT_PARAMS_MAX + 1]; + u32 param_id = 0; + int ret; + + ret = nla_parse_nested(tb, P4TC_ACT_PARAMS_MAX, nla, p4a_parm_policy, + extack); + if (ret < 0) { + ret = -EINVAL; + goto out; + } + + if (tb[P4TC_ACT_PARAMS_ID]) + param_id = nla_get_u32(tb[P4TC_ACT_PARAMS_ID]); + + if (update) + return p4a_tmpl_parm_update(act, tb, params_idr, param_id, + extack); + else + return p4a_tmpl_parm_create(act, params_idr, tb, param_id, + extack); + +out: + return ERR_PTR(ret); +} + +static int p4a_tmpl_parms_init(struct p4tc_act *act, struct nlattr *nla, + struct idr *params_idr, bool update, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MSGBATCH_SIZE + 1]; + int ret; + int i; + + ret = nla_parse_nested(tb, P4TC_MSGBATCH_SIZE, nla, NULL, extack); + if (ret < 0) + return -EINVAL; + + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && tb[i]; i++) { + struct p4tc_act_param *param; + + param = p4a_tmpl_parm_init(act, tb[i], params_idr, update, + extack); + if (IS_ERR(param)) { + ret = PTR_ERR(param); + goto params_del; + } + } + + return i - 1; + +params_del: + p4a_tmpl_parms_put_many(params_idr); + return ret; +} + +static int p4a_tmpl_init(struct p4tc_act *act, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + int num_params = 0; + int ret; + + idr_init(&act->params_idr); + + if (nla) { + num_params = + p4a_tmpl_parms_init(act, nla, &act->params_idr, false, + extack); + if (num_params < 0) { + ret = num_params; + goto idr_destroy; + } + } + + return num_params; + +idr_destroy: + p4a_tmpl_parms_put_many(&act->params_idr); + idr_destroy(&act->params_idr); + return ret; +} + +static struct netlink_range_validation prealloc_range = { + .min = 1, + .max = P4TC_MAX_TENTRIES, +}; + +static const struct nla_policy p4a_tmpl_policy[P4TC_ACT_MAX + 1] = { + [P4TC_ACT_NAME] = { .type = NLA_STRING, .len = P4TC_ACT_TMPL_NAMSZ }, + [P4TC_ACT_PARMS] = { .type = NLA_NESTED }, + [P4TC_ACT_OPT] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_act_p4)), + [P4TC_ACT_NUM_PREALLOC] = + NLA_POLICY_FULL_RANGE(NLA_U32, &prealloc_range), + [P4TC_ACT_ACTIVE] = { .type = NLA_U8 }, +}; + +static void p4a_tmpl_parms_put(struct p4tc_act *act) +{ + struct p4tc_act_param *act_param; + unsigned long param_id, tmp; + + idr_for_each_entry_ul(&act->params_idr, act_param, tmp, param_id) { + idr_remove(&act->params_idr, param_id); + kfree(act_param); + } +} + +static int __p4a_tmpl_put(struct net *net, struct p4tc_pipeline *pipeline, + struct p4tc_act *act, bool teardown, + struct netlink_ext_ack *extack) +{ + struct tcf_p4act *p4act, *tmp_act; + + if (!teardown && refcount_read(&act->a_ref) > 1) { + NL_SET_ERR_MSG(extack, + "Unable to delete referenced action template"); + return -EBUSY; + } + + p4a_tmpl_parms_put(act); + + tcf_unregister_p4_action(net, &act->ops); + /* Free preallocated acts */ + list_for_each_entry_safe(p4act, tmp_act, &act->prealloc_list, node) { + list_del_init(&p4act->node); + if (p4act->common.tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) + tcf_idr_release(&p4act->common, true); + } + + idr_remove(&pipeline->p_act_idr, act->a_id); + + list_del(&act->head); + + kfree(act); + + pipeline->num_created_acts--; + + return 0; +} + +static int _p4a_tmpl_fill_nlmsg(struct net *net, struct sk_buff *skb, + struct p4tc_act *act) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_act_param *param; + struct nlattr *nest, *parms; + unsigned long param_id, tmp; + int i = 1; + + if (nla_put_u32(skb, P4TC_PATH, act->a_id)) + goto out_nlmsg_trim; + + nest = nla_nest_start(skb, P4TC_PARAMS); + if (!nest) + goto out_nlmsg_trim; + + if (nla_put_string(skb, P4TC_ACT_NAME, act->fullname)) + goto out_nlmsg_trim; + + if (nla_put_u32(skb, P4TC_ACT_NUM_PREALLOC, act->num_prealloc_acts)) + goto out_nlmsg_trim; + + parms = nla_nest_start(skb, P4TC_ACT_PARMS); + if (!parms) + goto out_nlmsg_trim; + + idr_for_each_entry_ul(&act->params_idr, param, tmp, param_id) { + struct nlattr *nest_count; + struct nlattr *nest_type; + + nest_count = nla_nest_start(skb, i); + if (!nest_count) + goto out_nlmsg_trim; + + if (nla_put_string(skb, P4TC_ACT_PARAMS_NAME, param->name)) + goto out_nlmsg_trim; + + if (nla_put_u32(skb, P4TC_ACT_PARAMS_ID, param->id)) + goto out_nlmsg_trim; + + nest_type = nla_nest_start(skb, P4TC_ACT_PARAMS_TYPE); + if (!nest_type) + goto out_nlmsg_trim; + + p4a_parm_type_fill(skb, param); + nla_nest_end(skb, nest_type); + + nla_nest_end(skb, nest_count); + i++; + } + nla_nest_end(skb, parms); + + nla_nest_end(skb, nest); + + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int p4a_tmpl_fill_nlmsg(struct net *net, struct sk_buff *skb, + struct p4tc_template_common *tmpl, + struct netlink_ext_ack *extack) +{ + return _p4a_tmpl_fill_nlmsg(net, skb, p4tc_to_act(tmpl)); +} + +static int p4a_tmpl_flush(struct sk_buff *skb, struct net *net, + struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + unsigned char *b = nlmsg_get_pos(skb); + unsigned long tmp, act_id; + struct p4tc_act *act; + int ret = 0; + int i = 0; + + if (nla_put_u32(skb, P4TC_PATH, 0)) + goto out_nlmsg_trim; + + if (idr_is_empty(&pipeline->p_act_idr)) { + NL_SET_ERR_MSG(extack, + "There are not action templates to flush"); + goto out_nlmsg_trim; + } + + idr_for_each_entry_ul(&pipeline->p_act_idr, act, tmp, act_id) { + if (__p4a_tmpl_put(net, pipeline, act, false, extack) < 0) { + ret = -EBUSY; + continue; + } + i++; + } + + if (nla_put_u32(skb, P4TC_COUNT, i)) + goto out_nlmsg_trim; + + if (ret < 0) { + if (i == 0) { + NL_SET_ERR_MSG(extack, + "Unable to flush any action template"); + goto out_nlmsg_trim; + } else { + NL_SET_ERR_MSG_FMT(extack, + "Flushed only %u action templates", + i); + } + } + + return i; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static int p4a_tmpl_gd(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + const u32 pipeid = ids[P4TC_PID_IDX], a_id = ids[P4TC_AID_IDX]; + struct nlattr *tb[P4TC_ACT_MAX + 1] = { NULL }; + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_pipeline *pipeline; + struct p4tc_act *act; + int ret = 0; + + if (n->nlmsg_type == RTM_DELP4TEMPLATE) + pipeline = + p4tc_pipeline_find_byany_unsealed(net, + nl_path_attrs->pname, + pipeid, extack); + else + pipeline = p4tc_pipeline_find_byany(net, + nl_path_attrs->pname, + pipeid, extack); + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + + if (nla) { + ret = nla_parse_nested(tb, P4TC_ACT_MAX, nla, + p4a_tmpl_policy, extack); + if (ret < 0) + return ret; + } + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (n->nlmsg_type == RTM_DELP4TEMPLATE && (n->nlmsg_flags & NLM_F_ROOT)) + return p4a_tmpl_flush(skb, net, pipeline, extack); + + act = p4a_tmpl_find_byanyattr(tb[P4TC_ACT_NAME], a_id, pipeline, + extack); + if (IS_ERR(act)) + return PTR_ERR(act); + + if (_p4a_tmpl_fill_nlmsg(net, skb, act) < 0) { + NL_SET_ERR_MSG(extack, + "Failed to fill notification attributes for template action"); + return -EINVAL; + } + + if (n->nlmsg_type == RTM_DELP4TEMPLATE) { + ret = __p4a_tmpl_put(net, pipeline, act, false, extack); + if (ret < 0) + goto out_nlmsg_trim; + } + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static int p4a_tmpl_put(struct p4tc_pipeline *pipeline, + struct p4tc_template_common *tmpl, + struct netlink_ext_ack *extack) +{ + struct p4tc_act *act = p4tc_to_act(tmpl); + + return __p4a_tmpl_put(pipeline->net, pipeline, act, true, extack); +} + +static void p4a_tmpl_parm_idx_set(struct idr *params_idr) +{ + struct p4tc_act_param *param; + unsigned long tmp, id; + int i = 0; + + idr_for_each_entry_ul(params_idr, param, tmp, id) { + param->index = i; + i++; + } +} + +static void p4a_tmpl_parms_replace_many(struct p4tc_act *act, + struct idr *params_idr) +{ + struct p4tc_act_param *param; + unsigned long tmp, id; + + idr_for_each_entry_ul(params_idr, param, tmp, id) { + idr_remove(params_idr, param->id); + param = idr_replace(&act->params_idr, param, param->id); + p4a_parm_put(param); + } +} + +static struct p4tc_act * +p4a_tmpl_create(struct net *net, struct nlattr **tb, + struct p4tc_pipeline *pipeline, u32 *ids, + struct netlink_ext_ack *extack) +{ + u32 a_id = ids[P4TC_AID_IDX]; + char fullname[ACTNAMSIZ]; + struct p4tc_act *act; + int num_params = 0; + size_t nbytes; + char *actname; + int ret = 0; + + if (!tb[P4TC_ACT_NAME]) { + NL_SET_ERR_MSG(extack, "Must supply action name"); + return ERR_PTR(-EINVAL); + } + + actname = nla_data(tb[P4TC_ACT_NAME]); + + nbytes = snprintf(fullname, ACTNAMSIZ, "%s/%s", pipeline->common.name, + actname); + if (nbytes == ACTNAMSIZ) { + NL_SET_ERR_MSG_FMT(extack, + "Full action name should fit in %u bytes", + ACTNAMSIZ); + return ERR_PTR(-E2BIG); + } + + if (p4a_tmpl_find_byname(fullname, pipeline, extack)) { + NL_SET_ERR_MSG(extack, "Action already exists with same name"); + return ERR_PTR(-EEXIST); + } + + if (p4a_tmpl_find_byid(pipeline, a_id)) { + NL_SET_ERR_MSG(extack, "Action already exists with same id"); + return ERR_PTR(-EEXIST); + } + + act = kzalloc(sizeof(*act), GFP_KERNEL); + if (!act) + return ERR_PTR(-ENOMEM); + + if (a_id) { + ret = idr_alloc_u32(&pipeline->p_act_idr, act, &a_id, a_id, + GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to alloc action id"); + goto free_act; + } + + act->a_id = a_id; + } else { + act->a_id = 1; + + ret = idr_alloc_u32(&pipeline->p_act_idr, act, &act->a_id, + UINT_MAX, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to alloc action id"); + goto free_act; + } + } + + /* We are only preallocating the instances once the action template is + * activated during update. + */ + if (tb[P4TC_ACT_NUM_PREALLOC]) + act->num_prealloc_acts = nla_get_u32(tb[P4TC_ACT_NUM_PREALLOC]); + else + act->num_prealloc_acts = P4TC_DEFAULT_NUM_PREALLOC; + + num_params = p4a_tmpl_init(act, tb[P4TC_ACT_PARMS], extack); + if (num_params < 0) { + ret = num_params; + goto idr_rm; + } + act->num_params = num_params; + + p4a_tmpl_parm_idx_set(&act->params_idr); + + act->pipeline = pipeline; + + pipeline->num_created_acts++; + + act->common.p_id = pipeline->common.p_id; + + strscpy(act->fullname, fullname, ACTNAMSIZ); + strscpy(act->common.name, actname, P4TC_ACT_TMPL_NAMSZ); + + refcount_set(&act->a_ref, 1); + + INIT_LIST_HEAD(&act->prealloc_list); + spin_lock_init(&act->list_lock); + + return act; + +idr_rm: + idr_remove(&pipeline->p_act_idr, act->a_id); + +free_act: + kfree(act); + + return ERR_PTR(ret); +} + +static struct p4tc_act * +p4a_tmpl_update(struct net *net, struct nlattr **tb, + struct p4tc_pipeline *pipeline, u32 *ids, + u32 flags, struct netlink_ext_ack *extack) +{ + const u32 a_id = ids[P4TC_AID_IDX]; + bool updates_params = false; + struct idr params_idr; + u32 num_prealloc_acts; + struct p4tc_act *act; + int num_params = 0; + s8 active = -1; + int ret = 0; + + act = p4a_tmpl_find_byanyattr(tb[P4TC_ACT_NAME], a_id, pipeline, + extack); + if (IS_ERR(act)) + return act; + + if (tb[P4TC_ACT_ACTIVE]) + active = nla_get_u8(tb[P4TC_ACT_ACTIVE]); + + if (act->active) { + if (!active) { + act->active = false; + return act; + } + NL_SET_ERR_MSG(extack, "Unable to update active action"); + + ret = -EINVAL; + goto out; + } + + idr_init(¶ms_idr); + if (tb[P4TC_ACT_PARMS]) { + num_params = p4a_tmpl_parms_init(act, tb[P4TC_ACT_PARMS], + ¶ms_idr, true, extack); + if (num_params < 0) { + ret = num_params; + goto idr_destroy; + } + p4a_tmpl_parm_idx_set(¶ms_idr); + updates_params = true; + } + + if (tb[P4TC_ACT_NUM_PREALLOC]) + num_prealloc_acts = nla_get_u32(tb[P4TC_ACT_NUM_PREALLOC]); + else + num_prealloc_acts = act->num_prealloc_acts; + + act->pipeline = pipeline; + if (active == 1) { + act->active = true; + } else if (!active) { + NL_SET_ERR_MSG(extack, "Action is already inactive"); + ret = -EINVAL; + goto params_del; + } + + act->num_prealloc_acts = num_prealloc_acts; + + if (updates_params) + p4a_tmpl_parms_replace_many(act, ¶ms_idr); + + idr_destroy(¶ms_idr); + + return act; + +params_del: + p4a_tmpl_parms_put_many(¶ms_idr); + +idr_destroy: + idr_destroy(¶ms_idr); + +out: + return ERR_PTR(ret); +} + +static struct p4tc_template_common * +p4a_tmpl_cu(struct net *net, struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + const u32 pipeid = ids[P4TC_PID_IDX]; + struct nlattr *tb[P4TC_ACT_MAX + 1]; + struct p4tc_pipeline *pipeline; + struct p4tc_act *act; + int ret; + + pipeline = p4tc_pipeline_find_byany_unsealed(net, nl_path_attrs->pname, + pipeid, extack); + if (IS_ERR(pipeline)) + return (void *)pipeline; + + ret = nla_parse_nested(tb, P4TC_ACT_MAX, nla, p4a_tmpl_policy, + extack); + if (ret < 0) + return ERR_PTR(ret); + + switch (n->nlmsg_type) { + case RTM_CREATEP4TEMPLATE: + act = p4a_tmpl_create(net, tb, pipeline, ids, extack); + break; + case RTM_UPDATEP4TEMPLATE: + act = p4a_tmpl_update(net, tb, pipeline, ids, + n->nlmsg_flags, extack); + break; + default: + return ERR_PTR(-EOPNOTSUPP); + } + + if (IS_ERR(act)) + goto out; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + +out: + return (struct p4tc_template_common *)act; +} + +static int p4a_tmpl_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct nlattr *nla, char **p_name, u32 *ids, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct p4tc_pipeline *pipeline; + + if (!ctx->ids[P4TC_PID_IDX]) { + pipeline = p4tc_pipeline_find_byany(net, *p_name, + ids[P4TC_PID_IDX], extack); + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + ctx->ids[P4TC_PID_IDX] = pipeline->common.p_id; + } else { + pipeline = p4tc_pipeline_find_byid(net, ctx->ids[P4TC_PID_IDX]); + } + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!(*p_name)) + *p_name = pipeline->common.name; + + return p4tc_tmpl_generic_dump(skb, ctx, &pipeline->p_act_idr, + P4TC_AID_IDX, extack); +} + +static int p4a_tmpl_dump_1(struct sk_buff *skb, + struct p4tc_template_common *common) +{ + struct nlattr *param = nla_nest_start(skb, P4TC_PARAMS); + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_act *act = p4tc_to_act(common); + + if (!param) + goto out_nlmsg_trim; + + if (nla_put_string(skb, P4TC_ACT_NAME, act->fullname)) + goto out_nlmsg_trim; + + if (nla_put_u8(skb, P4TC_ACT_ACTIVE, act->active)) + goto out_nlmsg_trim; + + nla_nest_end(skb, param); + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -ENOMEM; +} + +const struct p4tc_template_ops p4tc_act_ops = { + .init = NULL, + .cu = p4a_tmpl_cu, + .put = p4a_tmpl_put, + .gd = p4a_tmpl_gd, + .fill_nlmsg = p4a_tmpl_fill_nlmsg, + .dump = p4a_tmpl_dump, + .dump_1 = p4a_tmpl_dump_1, +}; diff --git a/net/sched/p4tc/p4tc_pipeline.c b/net/sched/p4tc/p4tc_pipeline.c index 6532dc899..c3c957ad8 100644 --- a/net/sched/p4tc/p4tc_pipeline.c +++ b/net/sched/p4tc/p4tc_pipeline.c @@ -74,6 +74,8 @@ static const struct nla_policy tc_pipeline_policy[P4TC_PIPELINE_MAX + 1] = { static void p4tc_pipeline_destroy(struct p4tc_pipeline *pipeline) { + idr_destroy(&pipeline->p_act_idr); + kfree(pipeline); } @@ -95,8 +97,12 @@ static void p4tc_pipeline_teardown(struct p4tc_pipeline *pipeline, struct net *net = pipeline->net; struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); struct net *pipeline_net = maybe_get_net(net); + unsigned long iter_act_id; + struct p4tc_act *act; + unsigned long tmp; - idr_remove(&pipe_net->pipeline_idr, pipeline->common.p_id); + idr_for_each_entry_ul(&pipeline->p_act_idr, act, tmp, iter_act_id) + act->common.ops->put(pipeline, &act->common, extack); /* If we are on netns cleanup we can't touch the pipeline_idr. * On pre_exit we will destroy the idr but never call into teardown @@ -151,6 +157,7 @@ static inline int pipeline_try_set_state_ready(struct p4tc_pipeline *pipeline, } pipeline->p_state = P4TC_STATE_READY; + return true; } @@ -248,6 +255,10 @@ static struct p4tc_pipeline *p4tc_pipeline_create(struct net *net, else pipeline->num_tables = P4TC_DEFAULT_NUM_TABLES; + idr_init(&pipeline->p_act_idr); + + pipeline->num_created_acts = 0; + pipeline->p_state = P4TC_STATE_NOT_READY; pipeline->net = net; @@ -502,7 +513,8 @@ static int p4tc_pipeline_gd(struct net *net, struct sk_buff *skb, return PTR_ERR(pipeline); tmpl = (struct p4tc_template_common *)pipeline; - if (p4tc_pipeline_fill_nlmsg(net, skb, tmpl, extack) < 0) + ret = p4tc_pipeline_fill_nlmsg(net, skb, tmpl, extack); + if (ret < 0) return -1; if (!ids[P4TC_PID_IDX]) diff --git a/net/sched/p4tc/p4tc_tmpl_api.c b/net/sched/p4tc/p4tc_tmpl_api.c index d7b3b077c..329ec7bc9 100644 --- a/net/sched/p4tc/p4tc_tmpl_api.c +++ b/net/sched/p4tc/p4tc_tmpl_api.c @@ -42,6 +42,7 @@ static bool obj_is_valid(u32 obj) { switch (obj) { case P4TC_OBJ_PIPELINE: + case P4TC_OBJ_ACT: return true; default: return false; @@ -50,6 +51,7 @@ static bool obj_is_valid(u32 obj) static const struct p4tc_template_ops *p4tc_ops[P4TC_OBJ_MAX + 1] = { [P4TC_OBJ_PIPELINE] = &p4tc_pipeline_ops, + [P4TC_OBJ_ACT] = &p4tc_act_ops, }; int p4tc_tmpl_generic_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, @@ -124,6 +126,11 @@ static int tc_ctl_p4_tmpl_gd_1(struct net *net, struct sk_buff *skb, ids[P4TC_PID_IDX] = t->pipeid; + if (tb[P4TC_PATH]) { + const u32 *arg_ids = nla_data(tb[P4TC_PATH]); + + memcpy(&ids[P4TC_PID_IDX + 1], arg_ids, nla_len(tb[P4TC_PATH])); + } nl_path_attrs->ids = ids; op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; @@ -311,6 +318,12 @@ p4tc_tmpl_cu_1(struct sk_buff *skb, struct net *net, struct nlmsghdr *n, } ids[P4TC_PID_IDX] = t->pipeid; + + if (tb[P4TC_PATH]) { + const u32 *arg_ids = nla_data(tb[P4TC_PATH]); + + memcpy(&ids[P4TC_PID_IDX + 1], arg_ids, nla_len(tb[P4TC_PATH])); + } nl_path_attrs->ids = ids; op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; @@ -504,6 +517,11 @@ static int tc_ctl_p4_tmpl_dump_1(struct sk_buff *skb, struct nlattr *arg, root = nla_nest_start(skb, P4TC_ROOT); ids[P4TC_PID_IDX] = t->pipeid; + if (tb[P4TC_PATH]) { + const u32 *arg_ids = nla_data(tb[P4TC_PATH]); + + memcpy(&ids[P4TC_PID_IDX + 1], arg_ids, nla_len(tb[P4TC_PATH])); + } op = (struct p4tc_template_ops *)p4tc_ops[t->obj]; ret = op->dump(skb, ctx, tb[P4TC_PARAMS], &p_name, ids, extack); From patchwork Fri Dec 1 18:29:00 2023 Content-Type: text/plain; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:23 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 11/15] p4tc: add P4 action runtime support Date: Fri, 1 Dec 2023 13:29:00 -0500 Message-Id: <20231201182904.532825-12-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This commit deals with the runtime part of P4 actions i.e instantiation and binding of action kinds which are created via templates (see previous patch). For illustration we repeat the P4 code snippet from the action template commit: action send_nh(@tc_type("macaddr) bit<48> dstAddr, @tc_type("dev") bit<8> port) { hdr.ethernet.dstAddr = dstMac; send_to_port(port); } table mytable { key = { hdr.ipv4.dstAddr @tc_type("ipv4"): lpm; } actions = { send_nh; drop; NoAction; } size = 1024; } One could create a table entry alongside an action instance as follows: tc p4ctrl create aP4proggie/table/mycontrol/mytable \ srcAddr 10.10.10.0/24 \ action send_nh param dstAddr AA:BB:CC:DD:EE:FF param port eth0 As previously stated, we refer to the action by it's "full name" (pipeline_name/action_name). Here we are creating an instance of the send_nh action specifying as parameter values AA:BB:CC:DD:EE:FF for dstAddr and eth0 for port. Or they could create an instance that is then added to the pool of send_nh action instances as follows: tc actions add action aP4proggie/send_nh \ param dstAddr AA:BB:CC:DD:EE:FF param port eth0 Observe these are _exactly the same semantics_ as what tc today already provides with a caveat that we have a keyword "param" to precede the appropriate parameters. Note: We can create as many instances for action templates as we wish, as long as we do not exceed the maximum allowed actions - in this specific case 1024 for table "mytable". Action sharing still works the same way (as in classical tc). For example if we know the action index of the previous instance is 100 then we can bind it to a table entry, for example tc p4ctrl create aP4proggie/table/mycontrol/mytable \ srcAddr 11.11.0.0/16 action send_nh index 100 Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/p4tc.h | 98 +++ net/sched/p4tc/p4tc_action.c | 1163 +++++++++++++++++++++++++++++++++- 2 files changed, 1251 insertions(+), 10 deletions(-) diff --git a/include/net/p4tc.h b/include/net/p4tc.h index 9dfb1d4a7..31ba51087 100644 --- a/include/net/p4tc.h +++ b/include/net/p4tc.h @@ -117,6 +117,59 @@ p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name, const u32 pipeid, struct netlink_ext_ack *extack); +struct p4tc_act *p4a_runt_find(struct net *net, + const struct tc_action_ops *a_o, + struct netlink_ext_ack *extack); +void +p4a_runt_prealloc_put(struct p4tc_act *act, struct tcf_p4act *p4_act); + +static inline int p4tc_action_destroy(struct tc_action **acts) +{ + struct tc_action *acts_non_prealloc[TCA_ACT_MAX_PRIO] = {NULL}; + int ret = 0; + + if (acts) { + int j = 0; + int i; + + for (i = 0; i < TCA_ACT_MAX_PRIO && acts[i]; i++) { + if (acts[i]->tcfa_flags & TCA_ACT_FLAGS_PREALLOC) { + struct tcf_p4act *p4act; + struct p4tc_act *act; + struct net *net; + + p4act = (struct tcf_p4act *)acts[i]; + net = maybe_get_net(acts[i]->idrinfo->net); + + if (net) { + const struct tc_action_ops *ops; + + ops = acts[i]->ops; + act = p4a_runt_find(net, ops, NULL); + p4a_runt_prealloc_put(act, p4act); + put_net(net); + } else { + /* If net is coming down, template + * action will be deleted, so no need to + * remove from prealloc list, just decr + * refcounts. + */ + acts_non_prealloc[j] = acts[i]; + j++; + } + } else { + acts_non_prealloc[j] = acts[i]; + j++; + } + } + + ret = tcf_action_destroy(acts_non_prealloc, TCA_ACT_UNBIND); + kfree(acts); + } + + return ret; +} + struct p4tc_act_param { struct list_head head; struct rcu_head rcu; @@ -171,6 +224,47 @@ struct p4tc_act { extern const struct p4tc_template_ops p4tc_act_ops; +static inline int p4tc_action_init(struct net *net, struct nlattr *nla, + struct tc_action *acts[], u32 pipeid, + u32 flags, struct netlink_ext_ack *extack) +{ + int init_res[TCA_ACT_MAX_PRIO]; + size_t attrs_size; + int ret; + int i; + + /* If action was already created, just bind to existing one */ + flags |= TCA_ACT_FLAGS_BIND; + flags |= TCA_ACT_FLAGS_FROM_P4TC; + ret = tcf_action_init(net, NULL, nla, NULL, acts, init_res, &attrs_size, + flags, 0, extack); + + /* Check if we are trying to bind to dynamic action from different + * pipeline. + */ + for (i = 0; i < TCA_ACT_MAX_PRIO && acts[i]; i++) { + struct tc_action *a = acts[i]; + struct tcf_p4act *p; + + if (a->ops->id <= TCA_ID_MAX) + continue; + + p = to_p4act(a); + if (p->p_id != pipeid) { + NL_SET_ERR_MSG(extack, + "Unable to bind to dynact from different pipeline"); + ret = -EPERM; + goto destroy_acts; + } + } + + return ret; + +destroy_acts: + p4tc_action_destroy(acts); + return ret; +} + struct p4tc_act *p4a_tmpl_get(struct p4tc_pipeline *pipeline, const char *act_name, const u32 a_id, struct netlink_ext_ack *extack); @@ -182,6 +276,10 @@ static inline bool p4tc_action_put_ref(struct p4tc_act *act) return refcount_dec_not_one(&act->a_ref); } +struct tcf_p4act * +p4a_runt_prealloc_get_next(struct p4tc_act *act); +void p4a_runt_init_flags(struct tcf_p4act *p4act); + #define to_pipeline(t) ((struct p4tc_pipeline *)t) #define to_hdrfield(t) ((struct p4tc_hdrfield *)t) #define p4tc_to_act(t) ((struct p4tc_act *)t) diff --git a/net/sched/p4tc/p4tc_action.c b/net/sched/p4tc/p4tc_action.c index 6a4310c01..b0fdfec5b 100644 --- a/net/sched/p4tc/p4tc_action.c +++ b/net/sched/p4tc/p4tc_action.c @@ -30,11 +30,503 @@ #include #include +static LIST_HEAD(dynact_list); + +#define P4TC_ACT_CREATED 1 +#define P4TC_ACT_PREALLOC 2 +#define P4TC_ACT_PREALLOC_UNINIT 3 + +static int __p4a_runt_init(struct net *net, struct nlattr *est, + struct p4tc_act *act, struct tc_act_p4 *parm, + struct tc_action **a, struct tcf_proto *tp, + struct tc_action_ops *a_o, + struct tcf_chain **goto_ch, u32 flags, + struct netlink_ext_ack *extack) +{ + bool from_p4tc = flags & TCA_ACT_FLAGS_FROM_P4TC; + bool prealloc = flags & TCA_ACT_FLAGS_PREALLOC; + bool replace = flags & TCA_ACT_FLAGS_REPLACE; + bool bind = flags & TCA_ACT_FLAGS_BIND; + struct p4tc_pipeline *pipeline; + struct tcf_p4act *p4act; + u32 index = parm->index; + bool exists = false; + int ret = 0; + int err; + + if ((from_p4tc && !prealloc && !replace && !index)) { + p4act = p4a_runt_prealloc_get_next(act); + + if (p4act) { + p4a_runt_init_flags(p4act); + *a = &p4act->common; + return P4TC_ACT_PREALLOC_UNINIT; + } + } + + err = tcf_idr_check_alloc(act->tn, &index, a, bind); + if (err < 0) + return err; + + exists = err; + if (!exists) { + struct tcf_p4act *p; + + ret = tcf_idr_create(act->tn, index, est, a, a_o, bind, true, + flags); + if (ret) { + tcf_idr_cleanup(act->tn, index); + return ret; + } + + /* p4_ref here should never be 0, because if we are here, it + * means that a template action of this kind was created. Thus + * p4_ref should be at least 1. Also since this operation and + * others that add or delete action templates run with + * rtnl_lock held, we cannot do this op and a deletion op in + * parallel. + */ + WARN_ON(!refcount_inc_not_zero(&a_o->p4_ref)); + + pipeline = act->pipeline; + + p = to_p4act(*a); + p->p_id = pipeline->common.p_id; + p->act_id = act->a_id; + + p->common.tcfa_flags |= TCA_ACT_FLAGS_PREALLOC; + if (!prealloc && !bind) { + spin_lock_bh(&act->list_lock); + list_add_tail(&p->node, &act->prealloc_list); + spin_unlock_bh(&act->list_lock); + } + + ret = P4TC_ACT_CREATED; + } else { + if (bind) { + if (((*a)->tcfa_flags & TCA_ACT_FLAGS_PREALLOC)) { + if ((*a)->tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) { + p4act = to_p4act(*a); + p4a_runt_init_flags(p4act); + return P4TC_ACT_PREALLOC_UNINIT; + } + + return P4TC_ACT_PREALLOC; + } + + return 0; + } + + if (replace) { + if (((*a)->tcfa_flags & TCA_ACT_FLAGS_PREALLOC)) { + if ((*a)->tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) { + p4act = to_p4act(*a); + p4a_runt_init_flags(p4act); + ret = P4TC_ACT_PREALLOC_UNINIT; + } else { + ret = P4TC_ACT_PREALLOC; + } + } + } else { + NL_SET_ERR_MSG_FMT(extack, + "Action %s with index %u was already created", + (*a)->ops->kind, index); + tcf_idr_release(*a, bind); + return -EEXIST; + } + } + + err = tcf_action_check_ctrlact(parm->action, tp, goto_ch, extack); + if (err < 0) { + tcf_idr_release(*a, bind); + return err; + } + + return ret; +} + +static void p4a_runt_parm_val_free(struct p4tc_act_param *param) +{ + kfree(param->value); + kfree(param->mask); +} + +static const struct nla_policy p4a_parm_val_policy[P4TC_ACT_VALUE_PARAMS_MAX + 1] = { + [P4TC_ACT_PARAMS_VALUE_RAW] = { .type = NLA_BINARY }, +}; + +static const struct nla_policy p4a_parm_type_policy[P4TC_ACT_PARAMS_TYPE_MAX + 1] = { + [P4TC_ACT_PARAMS_TYPE_BITEND] = { .type = NLA_U16 }, + [P4TC_ACT_PARAMS_TYPE_CONTAINER_ID] = { .type = NLA_U32 }, +}; + +static int p4a_runt_dev_parm_val_init(struct net *net, + struct p4tc_act_param_ops *op, + struct p4tc_act_param *nparam, + struct nlattr **tb, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb_value[P4TC_ACT_VALUE_PARAMS_MAX + 1]; + u32 value_len; + u32 *ifindex; + int err; + + if (!tb[P4TC_ACT_PARAMS_VALUE]) { + NL_SET_ERR_MSG(extack, "Must specify param value"); + return -EINVAL; + } + err = nla_parse_nested(tb_value, P4TC_ACT_VALUE_PARAMS_MAX, + tb[P4TC_ACT_PARAMS_VALUE], + p4a_parm_val_policy, extack); + if (err < 0) + return err; + + value_len = nla_len(tb_value[P4TC_ACT_PARAMS_VALUE_RAW]); + if (value_len != sizeof(u32)) { + NL_SET_ERR_MSG(extack, "Value length differs from template's"); + return -EINVAL; + } + + ifindex = nla_data(tb_value[P4TC_ACT_PARAMS_VALUE_RAW]); + rcu_read_lock(); + if (!dev_get_by_index_rcu(net, *ifindex)) { + NL_SET_ERR_MSG(extack, "Invalid ifindex"); + rcu_read_unlock(); + return -EINVAL; + } + rcu_read_unlock(); + + nparam->value = kmemdup(ifindex, sizeof(*ifindex), GFP_KERNEL); + if (!nparam->value) + return -EINVAL; + + return 0; +} + +static int p4a_runt_dev_parm_val_dump(struct sk_buff *skb, + struct p4tc_act_param_ops *op, + struct p4tc_act_param *param) +{ + const u32 *ifindex = param->value; + struct nlattr *nest; + int ret; + + nest = nla_nest_start(skb, P4TC_ACT_PARAMS_VALUE); + if (nla_put_u32(skb, P4TC_ACT_PARAMS_VALUE_RAW, *ifindex)) { + ret = -EINVAL; + goto out_nla_cancel; + } + nla_nest_end(skb, nest); + + return 0; + +out_nla_cancel: + nla_nest_cancel(skb, nest); + return ret; +} + +static void p4a_runt_dev_parm_val_free(struct p4tc_act_param *param) +{ + kfree(param->value); +} + +static const struct p4tc_act_param_ops param_ops[P4TC_T_MAX + 1] = { + [P4TC_T_DEV] = { + .init_value = p4a_runt_dev_parm_val_init, + .dump_value = p4a_runt_dev_parm_val_dump, + .free = p4a_runt_dev_parm_val_free, + }, +}; + +static void p4a_runt_parms_destroy(struct tcf_p4act_params *params) +{ + struct p4tc_act_param *param; + unsigned long param_id, tmp; + + idr_for_each_entry_ul(¶ms->params_idr, param, tmp, param_id) { + struct p4tc_act_param_ops *op; + + idr_remove(¶ms->params_idr, param_id); + op = (struct p4tc_act_param_ops *) + ¶m_ops[param->type->typeid]; + if (op->free) + op->free(param); + else + p4a_runt_parm_val_free(param); + kfree(param); + } + + kfree(params->params_array); + idr_destroy(¶ms->params_idr); + + kfree(params); +} + +static void p4a_runt_parms_destroy_rcu(struct rcu_head *head) +{ + struct tcf_p4act_params *params; + + params = container_of(head, struct tcf_p4act_params, rcu); + p4a_runt_parms_destroy(params); +} + +static int __p4a_runt_init_set(struct p4tc_act *act, struct tc_action **a, + struct tcf_p4act_params *params, + struct tcf_chain *goto_ch, + struct tc_act_p4 *parm, bool exists, + struct netlink_ext_ack *extack) +{ + struct tcf_p4act_params *params_old; + struct tcf_p4act *p; + + p = to_p4act(*a); + + /* sparse is fooled by lock under conditionals. + * To avoid false positives, we are repeating these two lines in both + * branches of the if-statement + */ + if (exists) { + spin_lock_bh(&p->tcf_lock); + goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); + params_old = rcu_replace_pointer(p->params, params, 1); + spin_unlock_bh(&p->tcf_lock); + } else { + goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); + params_old = rcu_replace_pointer(p->params, params, 1); + } + + if (goto_ch) + tcf_chain_put_by_act(goto_ch); + + if (params_old) + call_rcu(¶ms_old->rcu, p4a_runt_parms_destroy_rcu); + + return 0; +} + +static int p4a_runt_init_from_tmpl(struct net *net, struct tc_action **a, + struct p4tc_act *act, + struct idr *params_idr, + struct list_head *params_lst, + struct tc_act_p4 *parm, u32 flags, + struct netlink_ext_ack *extack); + +static struct tcf_p4act_params *p4a_runt_parms_alloc(struct p4tc_act *act) +{ + struct tcf_p4act_params *params; + + params = kzalloc(sizeof(*params), GFP_KERNEL); + if (!params) + return ERR_PTR(-ENOMEM); + + params->params_array = kcalloc(act->num_params, + sizeof(struct p4tc_act_param *), + GFP_KERNEL); + if (!params->params_array) { + kfree(params); + return ERR_PTR(-ENOMEM); + } + + return params; +} + +static struct p4tc_act_param * +p4a_runt_prealloc_init_param(struct p4tc_act *act, struct idr *params_idr, + struct p4tc_act_param *param, + unsigned long *param_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *nparam; + void *value; + + nparam = kzalloc(sizeof(*nparam), GFP_KERNEL); + if (!nparam) + return ERR_PTR(-ENOMEM); + + value = kzalloc(BITS_TO_BYTES(param->type->container_bitsz), + GFP_KERNEL); + if (!value) { + kfree(nparam); + return ERR_PTR(-ENOMEM); + } + + strscpy(nparam->name, param->name, P4TC_ACT_PARAM_NAMSIZ); + nparam->id = *param_id; + nparam->value = value; + nparam->type = param->type; + + return nparam; +} + static void p4a_parm_put(struct p4tc_act_param *param) { kfree(param); } +static void p4a_runt_parm_put_val(struct p4tc_act_param *param) +{ + kfree(param->value); + p4a_parm_put(param); +} + +static void p4a_runt_prealloc_list_free(struct list_head *params_list) +{ + struct p4tc_act_param *nparam, *p; + + list_for_each_entry_safe(nparam, p, params_list, head) { + p4a_runt_parm_put_val(nparam); + } +} + +static int p4a_runt_prealloc_params_init(struct p4tc_act *act, + struct idr *params_idr, + struct list_head *params_lst, + struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *param; + unsigned long param_id = 0; + unsigned long tmp; + + idr_for_each_entry_ul(params_idr, param, tmp, param_id) { + struct p4tc_act_param *nparam; + + nparam = p4a_runt_prealloc_init_param(act, params_idr, + param, ¶m_id, + extack); + if (IS_ERR(nparam)) + return PTR_ERR(nparam); + + list_add_tail(&nparam->head, params_lst); + } + + return 0; +} + +static void +p4a_runt_prealloc_list_add(struct p4tc_act *act_tmpl, + struct tc_action **acts, + u32 num_prealloc_acts) +{ + int i; + + for (i = 0; i < num_prealloc_acts; i++) { + struct tcf_p4act *p4act = to_p4act(acts[i]); + + list_add_tail(&p4act->node, &act_tmpl->prealloc_list); + } + + tcf_idr_insert_n(acts, num_prealloc_acts); +} + +static int +p4a_runt_prealloc_create(struct net *net, struct p4tc_act *act, + struct idr *params_idr, struct tc_action **acts, + const u32 num_prealloc_acts, + struct netlink_ext_ack *extack) +{ + int err; + int i; + + for (i = 0; i < num_prealloc_acts; i++) { + u32 flags = TCA_ACT_FLAGS_PREALLOC | TCA_ACT_FLAGS_UNREFERENCED; + struct tc_action *a = acts[i]; + struct tc_act_p4 parm = {0}; + struct list_head params_lst; + + parm.index = i + 1; + parm.action = TC_ACT_PIPE; + + INIT_LIST_HEAD(¶ms_lst); + + err = p4a_runt_prealloc_params_init(act, params_idr, + ¶ms_lst, extack); + if (err < 0) { + p4a_runt_prealloc_list_free(¶ms_lst); + goto destroy_acts; + } + + err = p4a_runt_init_from_tmpl(net, &a, act, params_idr, + ¶ms_lst, &parm, flags, + extack); + p4a_runt_prealloc_list_free(¶ms_lst); + if (err < 0) + goto destroy_acts; + + acts[i] = a; + } + + return 0; + +destroy_acts: + tcf_action_destroy(acts, false); + + return err; +} + +/* Need to implement after preallocating */ +struct tcf_p4act * +p4a_runt_prealloc_get_next(struct p4tc_act *act) +{ + struct tcf_p4act *p4_act; + + spin_lock_bh(&act->list_lock); + p4_act = list_first_entry_or_null(&act->prealloc_list, struct tcf_p4act, + node); + if (p4_act) { + list_del_init(&p4_act->node); + refcount_set(&p4_act->common.tcfa_refcnt, 1); + atomic_set(&p4_act->common.tcfa_bindcnt, 1); + } + spin_unlock_bh(&act->list_lock); + + return p4_act; +} + +void p4a_runt_init_flags(struct tcf_p4act *p4act) +{ + struct tc_action *a; + + a = (struct tc_action *)p4act; + a->tcfa_flags &= ~TCA_ACT_FLAGS_UNREFERENCED; +} + +static void __p4a_runt_prealloc_put(struct p4tc_act *act, + struct tcf_p4act *p4act) +{ + struct tcf_p4act_params *p4act_params; + struct p4tc_act_param *param; + unsigned long param_id, tmp; + + spin_lock_bh(&p4act->tcf_lock); + p4act_params = rcu_dereference_protected(p4act->params, 1); + if (p4act_params) { + idr_for_each_entry_ul(&p4act_params->params_idr, param, tmp, + param_id) { + const struct p4tc_type *type = param->type; + u32 type_bytesz = BITS_TO_BYTES(type->container_bitsz); + + memset(param->value, 0, type_bytesz); + } + } + p4act->common.tcfa_flags |= TCA_ACT_FLAGS_UNREFERENCED; + spin_unlock_bh(&p4act->tcf_lock); + + spin_lock_bh(&act->list_lock); + list_add_tail(&p4act->node, &act->prealloc_list); + spin_unlock_bh(&act->list_lock); +} + +void +p4a_runt_prealloc_put(struct p4tc_act *act, struct tcf_p4act *p4act) +{ + if (refcount_read(&p4act->common.tcfa_refcnt) == 1) { + __p4a_runt_prealloc_put(act, p4act); + } else { + refcount_dec(&p4act->common.tcfa_refcnt); + atomic_dec(&p4act->common.tcfa_bindcnt); + } +} + static const struct nla_policy p4a_parm_policy[P4TC_ACT_PARAMS_MAX + 1] = { [P4TC_ACT_PARAMS_NAME] = { .type = NLA_STRING, @@ -46,6 +538,96 @@ static const struct nla_policy p4a_parm_policy[P4TC_ACT_PARAMS_MAX + 1] = { [P4TC_ACT_PARAMS_TYPE] = { .type = NLA_NESTED }, }; +static int +p4a_runt_parm_val_dump(struct sk_buff *skb, struct p4tc_type *type, + struct p4tc_act_param *param) +{ + const u32 bytesz = BITS_TO_BYTES(type->container_bitsz); + unsigned char *b = nlmsg_get_pos(skb); + struct nlattr *nla_value; + + nla_value = nla_nest_start(skb, P4TC_ACT_PARAMS_VALUE); + if (nla_put(skb, P4TC_ACT_PARAMS_VALUE_RAW, bytesz, + param->value)) + goto out_nlmsg_trim; + nla_nest_end(skb, nla_value); + + if (param->mask && + nla_put(skb, P4TC_ACT_PARAMS_MASK, bytesz, param->mask)) + goto out_nlmsg_trim; + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int +p4a_runt_parm_val_init(struct p4tc_act_param *nparam, + struct p4tc_type *type, struct nlattr **tb, + struct netlink_ext_ack *extack) +{ + const u32 alloc_len = BITS_TO_BYTES(type->container_bitsz); + struct nlattr *tb_value[P4TC_ACT_VALUE_PARAMS_MAX + 1]; + const u32 len = BITS_TO_BYTES(type->bitsz); + void *value; + int err; + + if (!tb[P4TC_ACT_PARAMS_VALUE]) { + NL_SET_ERR_MSG(extack, "Must specify param value"); + return -EINVAL; + } + + err = nla_parse_nested(tb_value, P4TC_ACT_VALUE_PARAMS_MAX, + tb[P4TC_ACT_PARAMS_VALUE], + p4a_parm_val_policy, extack); + if (err < 0) + return err; + + value = nla_data(tb_value[P4TC_ACT_PARAMS_VALUE_RAW]); + if (type->ops->validate_p4t) { + err = type->ops->validate_p4t(type, value, 0, nparam->bitend, + extack); + if (err < 0) + return err; + } + + if (nla_len(tb_value[P4TC_ACT_PARAMS_VALUE_RAW]) != len) + return -EINVAL; + + nparam->value = kzalloc(alloc_len, GFP_KERNEL); + if (!nparam->value) + return -ENOMEM; + + memcpy(nparam->value, value, len); + + if (tb[P4TC_ACT_PARAMS_MASK]) { + const void *mask = nla_data(tb[P4TC_ACT_PARAMS_MASK]); + + if (nla_len(tb[P4TC_ACT_PARAMS_MASK]) != len) { + NL_SET_ERR_MSG(extack, + "Mask length differs from template's"); + err = -EINVAL; + goto free_value; + } + + nparam->mask = kzalloc(alloc_len, GFP_KERNEL); + if (!nparam->mask) { + err = -ENOMEM; + goto free_value; + } + + memcpy(nparam->mask, mask, len); + } + + return 0; + +free_value: + kfree(nparam->value); + return err; +} + static struct p4tc_act_param * p4a_parm_find_byname(struct idr *params_idr, const char *param_name) { @@ -118,11 +700,6 @@ p4a_parm_find_byanyattr(struct p4tc_act *act, struct nlattr *name_attr, return p4a_parm_find_byany(act, param_name, param_id, extack); } -static const struct nla_policy p4a_parm_type_policy[P4TC_ACT_PARAMS_TYPE_MAX + 1] = { - [P4TC_ACT_PARAMS_TYPE_BITEND] = { .type = NLA_U16 }, - [P4TC_ACT_PARAMS_TYPE_CONTAINER_ID] = { .type = NLA_U32 }, -}; - static int __p4a_parm_init_type(struct p4tc_act_param *param, struct nlattr *nla, struct netlink_ext_ack *extack) @@ -167,6 +744,110 @@ __p4a_parm_init_type(struct p4tc_act_param *param, struct nlattr *nla, return 0; } +static int p4a_runt_parm_init(struct net *net, + struct tcf_p4act_params *params, + struct p4tc_act *act, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ACT_PARAMS_MAX + 1]; + struct p4tc_act_param *param, *nparam; + struct p4tc_act_param_ops *op; + u32 param_id = 0; + int err; + + err = nla_parse_nested(tb, P4TC_ACT_PARAMS_MAX, nla, p4a_parm_policy, + extack); + if (err < 0) + return err; + + if (tb[P4TC_ACT_PARAMS_ID]) + param_id = nla_get_u32(tb[P4TC_ACT_PARAMS_ID]); + + param = p4a_parm_find_byanyattr(act, tb[P4TC_ACT_PARAMS_NAME], + param_id, extack); + if (IS_ERR(param)) + return PTR_ERR(param); + + nparam = kzalloc(sizeof(*nparam), GFP_KERNEL); + if (!nparam) + return -ENOMEM; + + err = __p4a_parm_init_type(nparam, tb[P4TC_ACT_PARAMS_TYPE], + extack); + if (err < 0) + goto free; + + if (nparam->type != param->type) { + NL_SET_ERR_MSG(extack, + "Param type differs from template"); + err = -EINVAL; + goto free; + } + + if (nparam->bitend != param->bitend) { + NL_SET_ERR_MSG(extack, + "Param bitend differs from template"); + err = -EINVAL; + goto free; + } + + strscpy(nparam->name, param->name, P4TC_ACT_PARAM_NAMSIZ); + + op = (struct p4tc_act_param_ops *)¶m_ops[param->type->typeid]; + if (op->init_value) + err = op->init_value(net, op, nparam, tb, extack); + else + err = p4a_runt_parm_val_init(nparam, nparam->type, tb, + extack); + + if (err < 0) + goto free; + + nparam->id = param->id; + nparam->index = param->index; + + err = idr_alloc_u32(¶ms->params_idr, nparam, &nparam->id, + nparam->id, GFP_KERNEL); + if (err < 0) + goto free_val; + + params->params_array[param->index] = nparam; + + return 0; + +free_val: + if (op->free) + op->free(nparam); + else + p4a_runt_parm_val_free(nparam); + +free: + kfree(nparam); + return err; +} + +static int p4a_runt_parms_init(struct net *net, struct tcf_p4act_params *params, + struct p4tc_act *act, struct nlattr *nla, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MSGBATCH_SIZE + 1]; + int err; + int i; + + err = nla_parse_nested(tb, P4TC_MSGBATCH_SIZE, nla, NULL, NULL); + if (err < 0) + return err; + + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && tb[i]; i++) { + err = p4a_runt_parm_init(net, params, act, tb[i], + extack); + if (err < 0) + return err; + } + + return 0; +} + static struct p4tc_act * p4a_tmpl_find_byname(const char *fullname, struct p4tc_pipeline *pipeline, struct netlink_ext_ack *extack) @@ -181,6 +862,149 @@ p4a_tmpl_find_byname(const char *fullname, struct p4tc_pipeline *pipeline, return NULL; } +struct p4tc_act *p4a_runt_find(struct net *net, + const struct tc_action_ops *a_o, + struct netlink_ext_ack *extack) +{ + char *pname, *aname, fullname[ACTNAMSIZ]; + struct p4tc_pipeline *pipeline; + struct p4tc_act *act; + + strscpy(fullname, a_o->kind, ACTNAMSIZ); + + aname = fullname; + pname = strsep(&aname, "/"); + pipeline = p4tc_pipeline_find_byany(net, pname, 0, NULL); + if (IS_ERR(pipeline)) + return ERR_PTR(-ENOENT); + + act = p4a_tmpl_find_byname(a_o->kind, pipeline, extack); + if (!act) + return ERR_PTR(-ENOENT); + + return act; +} + +static int p4a_runt_init(struct net *net, struct nlattr *nla, + struct nlattr *est, struct tc_action **a, + struct tcf_proto *tp, struct tc_action_ops *a_o, + u32 flags, struct netlink_ext_ack *extack) +{ + bool bind = flags & TCA_ACT_FLAGS_BIND; + struct nlattr *tb[P4TC_ACT_MAX + 1]; + struct tcf_chain *goto_ch = NULL; + struct tcf_p4act_params *params; + struct tcf_p4act *prealloc_act; + struct tc_act_p4 *parm; + struct p4tc_act *act; + bool exists = false; + int ret = 0; + int err; + + if (flags & TCA_ACT_FLAGS_BIND && + !(flags & TCA_ACT_FLAGS_FROM_P4TC)) { + NL_SET_ERR_MSG(extack, + "Can only bind to dynamic action from P4TC objects"); + return -EPERM; + } + + if (unlikely(!nla)) { + NL_SET_ERR_MSG(extack, + "Must specify action netlink attributes"); + return -EINVAL; + } + + err = nla_parse_nested(tb, P4TC_ACT_MAX, nla, NULL, extack); + if (err < 0) + return err; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ACT_OPT)) { + NL_SET_ERR_MSG(extack, + "Must specify option netlink attributes"); + return -EINVAL; + } + + act = p4a_runt_find(net, a_o, extack); + if (IS_ERR(act)) + return PTR_ERR(act); + + if (!act->active) { + NL_SET_ERR_MSG(extack, + "Dynamic action must be active to create instance"); + return -EINVAL; + } + + parm = nla_data(tb[P4TC_ACT_OPT]); + + ret = __p4a_runt_init(net, est, act, parm, a, tp, a_o, &goto_ch, + flags, extack); + if (ret < 0) + return ret; + /* If trying to bind to unitialised preallocated action, must init + * below + */ + if (bind && ret == P4TC_ACT_PREALLOC) + return 0; + + err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); + if (err < 0) + goto release_idr; + + params = p4a_runt_parms_alloc(act); + if (IS_ERR(params)) { + err = PTR_ERR(params); + goto release_idr; + } + + idr_init(¶ms->params_idr); + if (tb[P4TC_ACT_PARMS]) { + err = p4a_runt_parms_init(net, params, act, tb[P4TC_ACT_PARMS], + extack); + if (err < 0) + goto release_params; + } else { + if (!idr_is_empty(&act->params_idr)) { + NL_SET_ERR_MSG(extack, + "Must specify action parameters"); + err = -EINVAL; + goto release_params; + } + } + + exists = ret != P4TC_ACT_CREATED; + err = __p4a_runt_init_set(act, a, params, goto_ch, parm, exists, + extack); + if (err < 0) + goto release_params; + + return ret; + +release_params: + p4a_runt_parms_destroy(params); + +release_idr: + if (ret == P4TC_ACT_PREALLOC) { + prealloc_act = to_p4act(*a); + p4a_runt_prealloc_put(act, prealloc_act); + (*a)->tcfa_flags |= TCA_ACT_FLAGS_UNREFERENCED; + } else if (!bind && !exists && + ((*a)->tcfa_flags & TCA_ACT_FLAGS_PREALLOC)) { + prealloc_act = to_p4act(*a); + list_del_init(&prealloc_act->node); + tcf_idr_release(*a, bind); + } else { + tcf_idr_release(*a, bind); + } + + return err; +} + +static int p4a_runt_act(struct sk_buff *skb, const struct tc_action *a, + struct tcf_result *res) +{ + return 0; +} + static int p4a_parm_type_fill(struct sk_buff *skb, struct p4tc_act_param *param) { unsigned char *b = nlmsg_get_pos(skb); @@ -199,6 +1023,248 @@ static int p4a_parm_type_fill(struct sk_buff *skb, struct p4tc_act_param *param) return -1; } +static int p4a_runt_dump(struct sk_buff *skb, struct tc_action *a, + int bind, int ref) +{ + struct tcf_p4act *dynact = to_p4act(a); + unsigned char *b = nlmsg_get_pos(skb); + struct tc_act_p4 opt = { + .index = dynact->tcf_index, + .refcnt = refcount_read(&dynact->tcf_refcnt) - ref, + .bindcnt = atomic_read(&dynact->tcf_bindcnt) - bind, + }; + struct tcf_p4act_params *params; + struct p4tc_act_param *parm; + struct nlattr *nest_parms; + struct tcf_t t; + int i = 1; + int id; + + spin_lock_bh(&dynact->tcf_lock); + + opt.action = dynact->tcf_action; + if (nla_put(skb, P4TC_ACT_OPT, sizeof(opt), &opt)) + goto nla_put_failure; + + if (nla_put_string(skb, P4TC_ACT_NAME, a->ops->kind)) + goto nla_put_failure; + + tcf_tm_dump(&t, &dynact->tcf_tm); + if (nla_put_64bit(skb, P4TC_ACT_TM, sizeof(t), &t, P4TC_ACT_PAD)) + goto nla_put_failure; + + nest_parms = nla_nest_start(skb, P4TC_ACT_PARMS); + if (!nest_parms) + goto nla_put_failure; + + params = rcu_dereference_protected(dynact->params, 1); + if (params) { + idr_for_each_entry(¶ms->params_idr, parm, id) { + struct p4tc_act_param_ops *op; + struct nlattr *nest_count; + struct nlattr *nest_type; + + nest_count = nla_nest_start(skb, i); + if (!nest_count) + goto nla_put_failure; + + if (nla_put_string(skb, P4TC_ACT_PARAMS_NAME, + parm->name)) + goto nla_put_failure; + + if (nla_put_u32(skb, P4TC_ACT_PARAMS_ID, parm->id)) + goto nla_put_failure; + + op = (struct p4tc_act_param_ops *) + ¶m_ops[parm->type->typeid]; + if (op->dump_value) { + if (op->dump_value(skb, op, parm) < 0) + goto nla_put_failure; + } else { + if (p4a_runt_parm_val_dump(skb, parm->type, + parm)) + goto nla_put_failure; + } + + nest_type = nla_nest_start(skb, P4TC_ACT_PARAMS_TYPE); + if (!nest_type) + goto nla_put_failure; + + p4a_parm_type_fill(skb, parm); + nla_nest_end(skb, nest_type); + + nla_nest_end(skb, nest_count); + i++; + } + } + nla_nest_end(skb, nest_parms); + + spin_unlock_bh(&dynact->tcf_lock); + + return skb->len; + +nla_put_failure: + spin_unlock_bh(&dynact->tcf_lock); + nlmsg_trim(skb, b); + return -1; +} + +static int p4a_runt_lookup(struct net *net, + const struct tc_action_ops *ops, + struct tc_action **a, u32 index) +{ + struct p4tc_act *act; + int err; + + act = p4a_runt_find(net, ops, NULL); + if (IS_ERR(act)) + return PTR_ERR(act); + + err = tcf_idr_search(act->tn, a, index); + if (!err) + return err; + + if ((*a)->tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) + return false; + + return err; +} + +static int p4a_runt_walker(struct net *net, struct sk_buff *skb, + struct netlink_callback *cb, int type, + const struct tc_action_ops *ops, + struct netlink_ext_ack *extack) +{ + struct p4tc_act *act; + + act = p4a_runt_find(net, ops, extack); + if (IS_ERR(act)) + return PTR_ERR(act); + + return tcf_generic_walker(act->tn, skb, cb, type, ops, extack); +} + +static void p4a_runt_cleanup(struct tc_action *a) +{ + struct tc_action_ops *ops = (struct tc_action_ops *)a->ops; + struct tcf_p4act *m = to_p4act(a); + struct tcf_p4act_params *params; + + params = rcu_dereference_protected(m->params, 1); + + if (refcount_read(&ops->p4_ref) > 1) + refcount_dec(&ops->p4_ref); + + if (params) + call_rcu(¶ms->rcu, p4a_runt_parms_destroy_rcu); +} + +static void p4a_runt_net_exit(struct tc_action_net *tn) +{ + tcf_idrinfo_destroy(tn->ops, tn->idrinfo); + kfree(tn->idrinfo); + kfree(tn); +} + +static int p4a_runt_parm_list_init(struct p4tc_act *act, + struct tcf_p4act_params *params, + struct list_head *params_lst) +{ + struct p4tc_act_param *nparam, *tmp; + u32 tot_params_sz = 0; + int err; + + list_for_each_entry_safe(nparam, tmp, params_lst, head) { + err = idr_alloc_u32(¶ms->params_idr, nparam, &nparam->id, + nparam->id, GFP_KERNEL); + if (err < 0) + return err; + list_del(&nparam->head); + params->num_params++; + tot_params_sz += nparam->type->container_bitsz; + } + /* Sum act_id */ + params->tot_params_sz = tot_params_sz + (sizeof(u32) << 3); + + return 0; +} + +/* This is the action instantiation that is invoked from the template code, + * specifically when initialising preallocated dynamic actions. + * This functions is analogous to p4a_runt_init. + */ +static int p4a_runt_init_from_tmpl(struct net *net, struct tc_action **a, + struct p4tc_act *act, + struct idr *params_idr, + struct list_head *params_lst, + struct tc_act_p4 *parm, u32 flags, + struct netlink_ext_ack *extack) +{ + bool bind = flags & TCA_ACT_FLAGS_BIND; + struct tc_action_ops *a_o = &act->ops; + struct tcf_chain *goto_ch = NULL; + struct tcf_p4act_params *params; + struct tcf_p4act *prealloc_act; + bool exists = false; + int ret; + int err; + + /* Don't need to check if action is active because we only call this + * when we are on our way to activating the action. + */ + ret = __p4a_runt_init(net, NULL, act, parm, a, NULL, a_o, &goto_ch, + flags, extack); + if (ret < 0) + return ret; + + params = p4a_runt_parms_alloc(act); + if (IS_ERR(params)) { + err = PTR_ERR(params); + goto release_idr; + } + + idr_init(¶ms->params_idr); + if (params_idr) { + err = p4a_runt_parm_list_init(act, params, params_lst); + if (err < 0) + goto release_params; + } else { + if (!idr_is_empty(&act->params_idr)) { + NL_SET_ERR_MSG(extack, + "Must specify action parameters"); + err = -EINVAL; + goto release_params; + } + } + + exists = ret != P4TC_ACT_CREATED; + err = __p4a_runt_init_set(act, a, params, goto_ch, parm, exists, + extack); + if (err < 0) + goto release_params; + + return err; + +release_params: + p4a_runt_parms_destroy(params); + +release_idr: + if (ret == P4TC_ACT_PREALLOC) { + prealloc_act = to_p4act(*a); + p4a_runt_prealloc_put(act, prealloc_act); + (*a)->tcfa_flags |= TCA_ACT_FLAGS_UNREFERENCED; + } else if (!bind && !exists && + ((*a)->tcfa_flags & TCA_ACT_FLAGS_PREALLOC)) { + prealloc_act = to_p4act(*a); + list_del_init(&prealloc_act->node); + tcf_idr_release(*a, bind); + } else { + tcf_idr_release(*a, bind); + } + + return err; +} + struct p4tc_act *p4a_tmpl_find_byid(struct p4tc_pipeline *pipeline, const u32 a_id) { @@ -543,7 +1609,8 @@ static int __p4a_tmpl_put(struct net *net, struct p4tc_pipeline *pipeline, { struct tcf_p4act *p4act, *tmp_act; - if (!teardown && refcount_read(&act->a_ref) > 1) { + if (!teardown && (refcount_read(&act->ops.p4_ref) > 1 || + refcount_read(&act->a_ref) > 1)) { NL_SET_ERR_MSG(extack, "Unable to delete referenced action template"); return -EBUSY; @@ -558,6 +1625,7 @@ static int __p4a_tmpl_put(struct net *net, struct p4tc_pipeline *pipeline, if (p4act->common.tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED) tcf_idr_release(&p4act->common, true); } + p4a_runt_net_exit(act->tn); idr_remove(&pipeline->p_act_idr, act->a_id); @@ -830,12 +1898,36 @@ p4a_tmpl_create(struct net *net, struct nlattr **tb, if (!act) return ERR_PTR(-ENOMEM); + strscpy(act->ops.kind, fullname, ACTNAMSIZ); + act->ops.owner = THIS_MODULE; + act->ops.act = p4a_runt_act; + act->ops.dump = p4a_runt_dump; + act->ops.cleanup = p4a_runt_cleanup; + act->ops.init_ops = p4a_runt_init; + act->ops.lookup = p4a_runt_lookup; + act->ops.walk = p4a_runt_walker; + act->ops.size = sizeof(struct tcf_p4act); + INIT_LIST_HEAD(&act->head); + + act->tn = kzalloc(sizeof(*act->tn), GFP_KERNEL); + if (!act->tn) { + ret = -ENOMEM; + goto free_act_ops; + } + + ret = tc_action_net_init(net, act->tn, &act->ops); + if (ret < 0) { + kfree(act->tn); + goto free_act_ops; + } + act->tn->ops = &act->ops; + if (a_id) { ret = idr_alloc_u32(&pipeline->p_act_idr, act, &a_id, a_id, GFP_KERNEL); if (ret < 0) { NL_SET_ERR_MSG(extack, "Unable to alloc action id"); - goto free_act; + goto free_action_net; } act->a_id = a_id; @@ -846,7 +1938,7 @@ p4a_tmpl_create(struct net *net, struct nlattr **tb, UINT_MAX, GFP_KERNEL); if (ret < 0) { NL_SET_ERR_MSG(extack, "Unable to alloc action id"); - goto free_act; + goto free_action_net; } } @@ -858,10 +1950,18 @@ p4a_tmpl_create(struct net *net, struct nlattr **tb, else act->num_prealloc_acts = P4TC_DEFAULT_NUM_PREALLOC; + refcount_set(&act->ops.p4_ref, 1); + ret = tcf_register_p4_action(net, &act->ops); + if (ret < 0) { + NL_SET_ERR_MSG(extack, + "Unable to register new action template"); + goto idr_rm; + } + num_params = p4a_tmpl_init(act, tb[P4TC_ACT_PARMS], extack); if (num_params < 0) { ret = num_params; - goto idr_rm; + goto unregister; } act->num_params = num_params; @@ -876,17 +1976,26 @@ p4a_tmpl_create(struct net *net, struct nlattr **tb, strscpy(act->fullname, fullname, ACTNAMSIZ); strscpy(act->common.name, actname, P4TC_ACT_TMPL_NAMSZ); + act->common.ops = (struct p4tc_template_ops *)&p4tc_act_ops; + refcount_set(&act->a_ref, 1); + list_add_tail(&act->head, &dynact_list); INIT_LIST_HEAD(&act->prealloc_list); spin_lock_init(&act->list_lock); return act; +unregister: + tcf_unregister_p4_action(net, &act->ops); + idr_rm: idr_remove(&pipeline->p_act_idr, act->a_id); -free_act: +free_action_net: + p4a_runt_net_exit(act->tn); + +free_act_ops: kfree(act); return ERR_PTR(ret); @@ -898,6 +2007,7 @@ p4a_tmpl_update(struct net *net, struct nlattr **tb, u32 flags, struct netlink_ext_ack *extack) { const u32 a_id = ids[P4TC_AID_IDX]; + struct tc_action **prealloc_acts; bool updates_params = false; struct idr params_idr; u32 num_prealloc_acts; @@ -916,6 +2026,11 @@ p4a_tmpl_update(struct net *net, struct nlattr **tb, if (act->active) { if (!active) { + if (refcount_read(&act->ops.p4_ref) > 1) { + NL_SET_ERR_MSG(extack, + "Unable to inactivate action with instances"); + return ERR_PTR(-EINVAL); + } act->active = false; return act; } @@ -944,6 +2059,31 @@ p4a_tmpl_update(struct net *net, struct nlattr **tb, act->pipeline = pipeline; if (active == 1) { + struct idr *chosen_idr = updates_params ? + ¶ms_idr : &act->params_idr; + + prealloc_acts = kcalloc(num_prealloc_acts, + sizeof(*prealloc_acts), + GFP_KERNEL); + if (!prealloc_acts) { + ret = -ENOMEM; + goto params_del; + } + chosen_idr = updates_params ? ¶ms_idr : &act->params_idr; + + ret = p4a_runt_prealloc_create(pipeline->net, act, + chosen_idr, + prealloc_acts, + num_prealloc_acts, + extack); + if (ret < 0) + goto free_prealloc_acts; + + p4a_runt_prealloc_list_add(act, prealloc_acts, + num_prealloc_acts); + + kfree(prealloc_acts); + act->active = true; } else if (!active) { NL_SET_ERR_MSG(extack, "Action is already inactive"); @@ -960,6 +2100,9 @@ p4a_tmpl_update(struct net *net, struct nlattr **tb, return act; +free_prealloc_acts: + kfree(prealloc_acts); + params_del: p4a_tmpl_parms_put_many(¶ms_idr); From patchwork Fri Dec 1 18:29:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476272 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="GiDlWIwD" Received: from mail-oo1-xc29.google.com (mail-oo1-xc29.google.com [IPv6:2607:f8b0:4864:20::c29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DB4C106 for ; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:25 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 12/15] p4tc: add template table create, update, delete, get, flush and dump Date: Fri, 1 Dec 2023 13:29:01 -0500 Message-Id: <20231201182904.532825-13-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org This commit introduces code to creation and maintenance of P4 tables defined in a P4 program. As with all other P4TC objects, tables' lifetimes conform to extended CRUD operations and are maintained via templates. It's important to note that write operations, such as create, update and delete can only be made if the pipeline is not sealed. Per the P4 specification, tables prefix their name with the control block (although this could be overridden by P4 annotations). As an example, if one were to create a table named table1 in a pipeline named myprog1, on control block "mycontrol", one would use the following command: tc p4template create table/myprog1/mycontrol/table1 tblid 1 \ keysz 32 nummasks 8 tentries 8192 Above says that we are creating a table (table1) attached to pipeline myprog1 on control block mycontrol. Table1's key size is 32 bits wide and it can have up to 8 associated masks and 8192 entries. The table id for table1 is 1. The table id is typically provided by the compiler. Parameters such as nummasks (number of masks this table may have) and tentries (maximum number of entries this table may have) may also be omitted in which case 8 masks and 256 entries will be assumed. P4 tables have many associated attributes that further refine how these tables operate. Some attributes per table and others per entry. Attributes include: - Table aging: The aging for the table entries belonging to the table (could be per table or entry) - Match key type: The match type of the table key (exact, LPM, ternary, etc). Note in P4 a key may constitute multiple (sub)key types, eg matching on srcip using a prefix and an exact match for dstip. In such a case it is up to the compiler to generalize the key used (For example in this case the overall key may endup being LPM or ternary). - Direct Counter: Table counter instances used directly by the table, when specified in the P4 program, there will be one counter per entry. - Direct Meter: Table meter instances used directly by the table, when specified in the P4 program, there will be one meter per entry. - CRUDXPS Permissions both for specific entries and tables. The permissions are applicable to both the control plane and the datapath (see "Table Permissions" further below). - Allowed Actions List. This will be a list of all possible actions that can be added to table entries that are added to the specified table. - Action profiles. When defined in a P4 program, action profiles provide a mechanism to share action instances. - Actions Selectors. When defined in a P4 program can be used to select the execution of one or more action instance selected at table lookup time by using a hash computation. - Default hit action. When a default hit action is defined it is used when a matched table entry did not define an action. Depending on the P4 program the default hit action can be updated at runtime (in addition to being specified in the template). - Default miss action. When a default miss action is defined it is used when a lookup that table fails. - Action scope. In addition to actions being annotated as default hit or miss they can also be annotated to be either specific to a table of globally available to multiple tables within the same P4 program. - Max entries. This is an upper bound for number of entries a specific table allows. - Num masks. In the case of LPM or ternary matches, this defines the maximum allowed masks for that table. - Timers. When defined in a P4 program, each entry has an associated timer. The table entries share a per-table timeout. The timer is refreshed every time there's a hit. After an idle period (defined in the per-table timeout), the P4 program can define whether it wants to have an event generated to user space (and have user space delete the entry), or whether it wants the kernel to delete it and send the event to announce the deletion. - per entry "static" vs "dynamic" entry. By default all entries made from the control plane are "static" unless otherwise specified. All entries added from datapath are "dynamic" unless otherwise specified. "Dynamic" entries are subject to deletion when idle (subject to the rules specified in "Timers" above). If one were to retrieve the table named table1 (before or after the pipeline is sealed) one would use the following command: tc -j p4template get table/myprog1/mycontrol/table1 | jq . If one were to dump all the tables from a pipeline named myprog1, one would use the following command: tc p4template get table/myprog1 If one were to update table1 (before the pipeline is sealed) one would use the following command: tc p4template update table/myprog1/mycontrol/table1 .... If one were to delete table1 (before the pipeline is sealed) one would use the following command: tc p4template del table/myprog1/mycontrol/table1 If one were to flush all the tables from a pipeline named myprog1, control block "mycontrol" one would use the following command: tc p4template del table/myprog1/mycontrol/ ___Table Permissions___ Tables can have permissions which apply to all the entries in the specified table. Permissions are defined for both what the control plane (user space) as well as the data path are allowed to do. The permissions field is a 16bit value which will hold CRUDXPS (create, read, update, delete, execute, publish and subscribe) permissions for control and data path. Bits 13-7 will have the CRUDXPS values for control and bits 6-0 will have CRUDXPS values for data path. By default each table has the following permissions: CRUD-PS-R--X-- Which means the control plane can perform CRUDPS operations whereas the data path can only Read and execute on the entries. The user can override these permissions when creating the table or when updating. For example, the following command will create a table which will not allow the datapath to create, update or delete entries but give full CRUDP permissions for the control plane. $TC p4template create table/aP4proggie/cb/tname tblid 1 keysz 64 type lpm \ permissions 0x3D24 ... Recall that these permissions come in the form of CRUDXPSCRUDXPS, where the first CRUDXPS block is for control and the last is for data path. So 0x3D24 is equivalent to CR-D-P--R--X-- If we were to issue a read command on a table (tname): $TC -j p4template get table/aP4proggie/cb/tname | jq . The output would be the following: [ { "obj": "table", "pname": "aP4Proggie", "pipeid": 22 }, { "templates": [ { "tblid": 1, "tname": "cb/tname", "keysz": 64, "max_entries": 256, "masks": 8, "entries": 0, "permissions": "CRUD-P--R--X--", "table_type": "lpm", "acts_list": [] } ] } ] Note, the permissions concept is more powerful than classical const definition currently taken by P4 which makes everything in a table read-only. ___Initial Table Entries___ Templating can create initial table entries. For example: tc p4template update table/myprog/cb/tname \ entry srcAddr 10.10.10.10/32 dstAddr 1.1.1.0/24 prio 17 In this command we are "updating" table cb/tname with a new entry. This entry has as its key srcAddr concatenated with dstAddr (both IPv4 addresses) and prio 17. If one was to read back the entry by issuing the following command: tc p4template get table/myprog/cb/tname They would get: pipeline id 22 table id 1 table name cb/tname key_sz 64 max entries 256 masks 8 table entries 1 permissions CRUD-P--R--X-- entry: entry priority 17[permissions-RUD-P--R--X--] entry key srcAddr id:1 size:32b type:ipv4 exact fieldval 10.10.10.10/32 dstAddr id:2 size:32b type:ipv4 exact fieldval 1.1.1.0/24 ___Table Actions List___ P4 tables allow certain actions but not other to be part of match entry on a table. P4 also defines default actions to be executed when no entries match; we have extended this concept to have a default hit,which is executed upon matching an entry which has no action associated with it. We also allow flags for each of the actions in this list that specify if the action can be added only as a table entry (tableonly), or only as a default action (defaultonly). If no flags are specified, it is assumed that the action can be used in both contexts. Both default hit and default miss are optional. An example of specifying a default miss action is as follows: tc p4template update table/myprog/cb/mytable \ default_miss_action permissions 0x1124 action drop The above will drop packets if the entry is not found in mytable. Note the above makes the default action a const. Meaning the control plane can neither replace it nor delete it. tc p4template update table/myprog/mytable \ default_hit_action permissions 0x3004 action ok Whereas the above allows a default hit action to accept the packet. The permission 0x3004 (binary 11000000000100) means we have only Create and Read permissions in the control plane and eXecute permissions in the data plane. This means, for example, that now we can only delete the default hit action from the control plane. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/p4tc.h | 135 ++- include/net/p4tc_types.h | 2 +- include/uapi/linux/p4tc.h | 122 +++ net/sched/p4tc/Makefile | 2 +- net/sched/p4tc/p4tc_action.c | 4 +- net/sched/p4tc/p4tc_pipeline.c | 23 +- net/sched/p4tc/p4tc_table.c | 1542 ++++++++++++++++++++++++++++++++ net/sched/p4tc/p4tc_tmpl_api.c | 2 + 8 files changed, 1820 insertions(+), 12 deletions(-) create mode 100644 net/sched/p4tc/p4tc_table.c diff --git a/include/net/p4tc.h b/include/net/p4tc.h index 31ba51087..b5e84594e 100644 --- a/include/net/p4tc.h +++ b/include/net/p4tc.h @@ -16,10 +16,18 @@ #define P4TC_DEFAULT_MAX_RULES 1 #define P4TC_PATH_MAX 3 #define P4TC_MAX_TENTRIES 0x2000000 +#define P4TC_DEFAULT_TENTRIES 256 +#define P4TC_MAX_TMASKS 1024 +#define P4TC_DEFAULT_TMASKS 8 +#define P4TC_MAX_T_AGING_MS 864000000 +#define P4TC_DEFAULT_T_AGING_MS 30000 + +#define P4TC_MAX_PERMISSION (GENMASK(P4TC_PERM_MAX_BIT, 0)) #define P4TC_KERNEL_PIPEID 0 #define P4TC_PID_IDX 0 +#define P4TC_TBLID_IDX 1 #define P4TC_AID_IDX 1 #define P4TC_PARSEID_IDX 1 @@ -70,6 +78,7 @@ extern const struct p4tc_template_ops p4tc_pipeline_ops; struct p4tc_pipeline { struct p4tc_template_common common; struct idr p_act_idr; + struct idr p_tbl_idr; struct rcu_head rcu; struct net *net; u32 num_created_acts; @@ -123,6 +132,11 @@ struct p4tc_act *p4a_runt_find(struct net *net, void p4a_runt_prealloc_put(struct p4tc_act *act, struct tcf_p4act *p4_act); +static inline bool p4tc_pipeline_sealed(struct p4tc_pipeline *pipeline) +{ + return pipeline->p_state == P4TC_STATE_READY; +} + static inline int p4tc_action_destroy(struct tc_action **acts) { struct tc_action *acts_non_prealloc[TCA_ACT_MAX_PRIO] = {NULL}; @@ -170,6 +184,63 @@ static inline int p4tc_action_destroy(struct tc_action **acts) return ret; } +#define P4TC_CONTROL_PERMISSIONS (GENMASK(13, 7)) +#define P4TC_DATA_PERMISSIONS (GENMASK(6, 0)) + +#define P4TC_TABLE_PERMISSIONS \ + ((GENMASK(P4TC_CTRL_PERM_C_BIT, P4TC_CTRL_PERM_D_BIT)) | \ + P4TC_CTRL_PERM_P | P4TC_CTRL_PERM_S | P4TC_DATA_PERM_R | \ + P4TC_DATA_PERM_X) + +#define P4TC_PERMISSIONS_UNINIT (1 << P4TC_PERM_MAX_BIT) + +struct p4tc_table_defact { + struct tc_action **default_acts; + /* Will have two 7 bits blocks containing CRUDXPS (Create, read, update, + * delete, execute, publish and subscribe) permissions for control plane + * and data plane. The first 5 bits are for control and the next five + * are for data plane. |crudxpscrudxps| if we were to denote it as UNIX + * permission flags. + */ + __u16 permissions; + struct rcu_head rcu; +}; + +struct p4tc_table_perm { + __u16 permissions; + struct rcu_head rcu; +}; + +struct p4tc_table { + struct p4tc_template_common common; + struct list_head tbl_acts_list; + struct idr tbl_masks_idr; + struct idr tbl_prio_idr; + struct rhltable tbl_entries; + struct p4tc_table_defact __rcu *tbl_default_hitact; + struct p4tc_table_defact __rcu *tbl_default_missact; + struct p4tc_table_perm __rcu *tbl_permissions; + struct p4tc_table_entry_mask __rcu **tbl_masks_array; + unsigned long __rcu *tbl_free_masks_bitmap; + u64 tbl_aging; + /* Locks the available masks IDR which will be used when adding and + * deleting table entries. + */ + spinlock_t tbl_masks_idr_lock; + u32 tbl_keysz; + u32 tbl_id; + u32 tbl_max_entries; + u32 tbl_max_masks; + u32 tbl_curr_num_masks; + /* Accounts for how many entities refer to this table. Usually just the + * pipeline it belongs to. + */ + refcount_t tbl_ctrl_ref; + u16 tbl_type; +}; + +extern const struct p4tc_template_ops p4tc_table_ops; + struct p4tc_act_param { struct list_head head; struct rcu_head rcu; @@ -222,6 +293,12 @@ struct p4tc_act { char fullname[ACTNAMSIZ]; }; +struct p4tc_table_act { + struct list_head node; + struct tc_action_ops *ops; + u8 flags; +}; + extern const struct p4tc_template_ops p4tc_act_ops; static inline int p4tc_action_init(struct net *net, struct nlattr *nla, @@ -276,12 +353,68 @@ static inline bool p4tc_action_put_ref(struct p4tc_act *act) return refcount_dec_not_one(&act->a_ref); } +struct p4tc_act_param *p4a_parm_find_byid(struct idr *params_idr, + const u32 param_id); +struct p4tc_act_param * +p4a_parm_find_byany(struct p4tc_act *act, const char *param_name, + const u32 param_id, struct netlink_ext_ack *extack); + +struct p4tc_table *p4tc_table_find_byany(struct p4tc_pipeline *pipeline, + const char *tblname, const u32 tbl_id, + struct netlink_ext_ack *extack); +struct p4tc_table *p4tc_table_find_byid(struct p4tc_pipeline *pipeline, + const u32 tbl_id); +int p4tc_table_try_set_state_ready(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack); +void p4tc_table_put_mask_array(struct p4tc_pipeline *pipeline); +struct p4tc_table *p4tc_table_find_get(struct p4tc_pipeline *pipeline, + const char *tblname, const u32 tbl_id, + struct netlink_ext_ack *extack); + +static inline bool p4tc_table_put_ref(struct p4tc_table *table) +{ + return refcount_dec_not_one(&table->tbl_ctrl_ref); +} + +struct p4tc_table_default_act_params { + struct p4tc_table_defact *default_hitact; + struct p4tc_table_defact *default_missact; + struct nlattr *default_hit_attr; + struct nlattr *default_miss_attr; +}; + +int +p4tc_table_init_default_acts(struct net *net, + struct p4tc_table_default_act_params *def_params, + struct p4tc_table *table, + struct list_head *acts_list, + struct netlink_ext_ack *extack); + +static inline void +p4tc_table_defacts_acts_copy(struct p4tc_table_defact *defact_copy, + struct p4tc_table_defact *defact_orig) +{ + defact_copy->default_acts = defact_orig->default_acts; +} + +void +p4tc_table_replace_default_acts(struct p4tc_table *table, + struct p4tc_table_default_act_params *def_params, + bool lock_rtnl); + +struct p4tc_table_perm * +p4tc_table_init_permissions(struct p4tc_table *table, u16 permissions, + struct netlink_ext_ack *extack); +void p4tc_table_replace_permissions(struct p4tc_table *table, + struct p4tc_table_perm *tbl_perm, + bool lock_rtnl); + struct tcf_p4act * p4a_runt_prealloc_get_next(struct p4tc_act *act); void p4a_runt_init_flags(struct tcf_p4act *p4act); #define to_pipeline(t) ((struct p4tc_pipeline *)t) -#define to_hdrfield(t) ((struct p4tc_hdrfield *)t) #define p4tc_to_act(t) ((struct p4tc_act *)t) +#define p4tc_to_table(t) ((struct p4tc_table *)t) #endif diff --git a/include/net/p4tc_types.h b/include/net/p4tc_types.h index 6cba34e36..8f26b85fe 100644 --- a/include/net/p4tc_types.h +++ b/include/net/p4tc_types.h @@ -8,7 +8,7 @@ #include -#define P4TC_T_MAX_BITSZ 128 +#define P4TC_T_MAX_BITSZ P4TC_MAX_KEYSZ struct p4tc_type_mask_shift { void *mask; diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h index f52e826bd..21f49de86 100644 --- a/include/uapi/linux/p4tc.h +++ b/include/uapi/linux/p4tc.h @@ -26,6 +26,87 @@ struct p4tcmsg { #define P4TC_PIPELINE_NAMSIZ P4TC_TMPL_NAMSZ #define P4TC_ACT_TMPL_NAMSZ P4TC_TMPL_NAMSZ #define P4TC_ACT_PARAM_NAMSIZ P4TC_TMPL_NAMSZ +#define P4TC_TABLE_NAMSIZ P4TC_TMPL_NAMSZ + +#define P4TC_TABLE_FLAGS_KEYSZ (1 << 0) +#define P4TC_TABLE_FLAGS_MAX_ENTRIES (1 << 1) +#define P4TC_TABLE_FLAGS_MAX_MASKS (1 << 2) +#define P4TC_TABLE_FLAGS_DEFAULT_KEY (1 << 3) +#define P4TC_TABLE_FLAGS_PERMISSIONS (1 << 4) +#define P4TC_TABLE_FLAGS_TYPE (1 << 5) +#define P4TC_TABLE_FLAGS_AGING (1 << 6) + +enum { + P4TC_TABLE_TYPE_UNSPEC, + P4TC_TABLE_TYPE_EXACT = 1, + P4TC_TABLE_TYPE_LPM = 2, + P4TC_TABLE_TYPE_TERNARY = 3, + __P4TC_TABLE_TYPE_MAX, +}; + +#define P4TC_TABLE_TYPE_MAX (__P4TC_TABLE_TYPE_MAX - 1) + +#define P4TC_CTRL_PERM_C_BIT 13 +#define P4TC_CTRL_PERM_R_BIT 12 +#define P4TC_CTRL_PERM_U_BIT 11 +#define P4TC_CTRL_PERM_D_BIT 10 +#define P4TC_CTRL_PERM_X_BIT 9 +#define P4TC_CTRL_PERM_P_BIT 8 +#define P4TC_CTRL_PERM_S_BIT 7 + +#define P4TC_DATA_PERM_C_BIT 6 +#define P4TC_DATA_PERM_R_BIT 5 +#define P4TC_DATA_PERM_U_BIT 4 +#define P4TC_DATA_PERM_D_BIT 3 +#define P4TC_DATA_PERM_X_BIT 2 +#define P4TC_DATA_PERM_P_BIT 1 +#define P4TC_DATA_PERM_S_BIT 0 + +#define P4TC_PERM_MAX_BIT P4TC_CTRL_PERM_C_BIT + +#define P4TC_CTRL_PERM_C (1 << P4TC_CTRL_PERM_C_BIT) +#define P4TC_CTRL_PERM_R (1 << P4TC_CTRL_PERM_R_BIT) +#define P4TC_CTRL_PERM_U (1 << P4TC_CTRL_PERM_U_BIT) +#define P4TC_CTRL_PERM_D (1 << P4TC_CTRL_PERM_D_BIT) +#define P4TC_CTRL_PERM_X (1 << P4TC_CTRL_PERM_X_BIT) +#define P4TC_CTRL_PERM_P (1 << P4TC_CTRL_PERM_P_BIT) +#define P4TC_CTRL_PERM_S (1 << P4TC_CTRL_PERM_S_BIT) + +#define P4TC_DATA_PERM_C (1 << P4TC_DATA_PERM_C_BIT) +#define P4TC_DATA_PERM_R (1 << P4TC_DATA_PERM_R_BIT) +#define P4TC_DATA_PERM_U (1 << P4TC_DATA_PERM_U_BIT) +#define P4TC_DATA_PERM_D (1 << P4TC_DATA_PERM_D_BIT) +#define P4TC_DATA_PERM_X (1 << P4TC_DATA_PERM_X_BIT) +#define P4TC_DATA_PERM_P (1 << P4TC_DATA_PERM_P_BIT) +#define P4TC_DATA_PERM_S (1 << P4TC_DATA_PERM_S_BIT) + +#define p4tc_ctrl_create_ok(perm) ((perm) & P4TC_CTRL_PERM_C) +#define p4tc_ctrl_read_ok(perm) ((perm) & P4TC_CTRL_PERM_R) +#define p4tc_ctrl_update_ok(perm) ((perm) & P4TC_CTRL_PERM_U) +#define p4tc_ctrl_delete_ok(perm) ((perm) & P4TC_CTRL_PERM_D) +#define p4tc_ctrl_exec_ok(perm) ((perm) & P4TC_CTRL_PERM_X) +#define p4tc_ctrl_pub_ok(perm) ((perm) & P4TC_CTRL_PERM_P) +#define p4tc_ctrl_sub_ok(perm) ((perm) & P4TC_CTRL_PERM_S) + +#define p4tc_data_create_ok(perm) ((perm) & P4TC_DATA_PERM_C) +#define p4tc_data_read_ok(perm) ((perm) & P4TC_DATA_PERM_R) +#define p4tc_data_update_ok(perm) ((perm) & P4TC_DATA_PERM_U) +#define p4tc_data_delete_ok(perm) ((perm) & P4TC_DATA_PERM_D) +#define p4tc_data_exec_ok(perm) ((perm) & P4TC_DATA_PERM_X) +#define p4tc_data_pub_ok(perm) ((perm) & P4TC_DATA_PERM_P) +#define p4tc_data_sub_ok(perm) ((perm) & P4TC_DATA_PERM_S) + +struct p4tc_table_parm { + __u64 tbl_aging; + __u32 tbl_keysz; + __u32 tbl_max_entries; + __u32 tbl_max_masks; + __u32 tbl_flags; + __u32 tbl_num_entries; + __u16 tbl_permissions; + __u8 tbl_type; + __u8 PAD0; +}; /* Root attributes */ enum { @@ -42,6 +123,7 @@ enum { P4TC_OBJ_UNSPEC, P4TC_OBJ_PIPELINE, P4TC_OBJ_ACT, + P4TC_OBJ_TABLE, __P4TC_OBJ_MAX, }; @@ -101,6 +183,46 @@ enum { #define P4TC_T_MAX (__P4TC_T_MAX - 1) +enum { + P4TC_TABLE_DEFAULT_UNSPEC, + P4TC_TABLE_DEFAULT_ACTION, + P4TC_TABLE_DEFAULT_PERMISSIONS, + __P4TC_TABLE_DEFAULT_MAX +}; + +#define P4TC_TABLE_DEFAULT_MAX (__P4TC_TABLE_DEFAULT_MAX - 1) + +enum { + P4TC_TABLE_ACTS_DEFAULT_ONLY, + P4TC_TABLE_ACTS_TABLE_ONLY, + __P4TC_TABLE_ACTS_FLAGS_MAX, +}; + +#define P4TC_TABLE_ACTS_FLAGS_MAX (__P4TC_TABLE_ACTS_FLAGS_MAX - 1) + +enum { + P4TC_TABLE_ACT_UNSPEC, + P4TC_TABLE_ACT_FLAGS, /* u8 */ + P4TC_TABLE_ACT_NAME, /* string */ + __P4TC_TABLE_ACT_MAX +}; + +#define P4TC_TABLE_ACT_MAX (__P4TC_TABLE_ACT_MAX - 1) + +/* Table type attributes */ +enum { + P4TC_TABLE_UNSPEC, + P4TC_TABLE_NAME, /* string */ + P4TC_TABLE_INFO, /* struct p4tc_table_parm */ + P4TC_TABLE_DEFAULT_HIT, /* nested default hit action attributes */ + P4TC_TABLE_DEFAULT_MISS, /* nested default miss action attributes */ + P4TC_TABLE_CONST_ENTRY, /* nested const table entry */ + P4TC_TABLE_ACTS_LIST, /* nested table actions list */ + __P4TC_TABLE_MAX +}; + +#define P4TC_TABLE_MAX (__P4TC_TABLE_MAX - 1) + /* Action attributes */ enum { P4TC_ACT_UNSPEC, diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index 7dbcf8915..7a9c13f86 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -1,4 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o \ - p4tc_action.o + p4tc_action.o p4tc_table.o diff --git a/net/sched/p4tc/p4tc_action.c b/net/sched/p4tc/p4tc_action.c index b0fdfec5b..ac35874b6 100644 --- a/net/sched/p4tc/p4tc_action.c +++ b/net/sched/p4tc/p4tc_action.c @@ -645,13 +645,13 @@ p4a_parm_find_byname(struct idr *params_idr, const char *param_name) return NULL; } -static struct p4tc_act_param * +struct p4tc_act_param * p4a_parm_find_byid(struct idr *params_idr, const u32 param_id) { return idr_find(params_idr, param_id); } -static struct p4tc_act_param * +struct p4tc_act_param * p4a_parm_find_byany(struct p4tc_act *act, const char *param_name, const u32 param_id, struct netlink_ext_ack *extack) { diff --git a/net/sched/p4tc/p4tc_pipeline.c b/net/sched/p4tc/p4tc_pipeline.c index c3c957ad8..f7ea1bcae 100644 --- a/net/sched/p4tc/p4tc_pipeline.c +++ b/net/sched/p4tc/p4tc_pipeline.c @@ -75,6 +75,7 @@ static const struct nla_policy tc_pipeline_policy[P4TC_PIPELINE_MAX + 1] = { static void p4tc_pipeline_destroy(struct p4tc_pipeline *pipeline) { idr_destroy(&pipeline->p_act_idr); + idr_destroy(&pipeline->p_tbl_idr); kfree(pipeline); } @@ -97,9 +98,13 @@ static void p4tc_pipeline_teardown(struct p4tc_pipeline *pipeline, struct net *net = pipeline->net; struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); struct net *pipeline_net = maybe_get_net(net); - unsigned long iter_act_id; + unsigned long iter_act_id, tmp; + struct p4tc_table *table; struct p4tc_act *act; - unsigned long tmp; + unsigned long tbl_id; + + idr_for_each_entry_ul(&pipeline->p_tbl_idr, table, tmp, tbl_id) + table->common.ops->put(pipeline, &table->common, extack); idr_for_each_entry_ul(&pipeline->p_act_idr, act, tmp, iter_act_id) act->common.ops->put(pipeline, &act->common, extack); @@ -150,22 +155,23 @@ static int __p4tc_pipeline_put(struct p4tc_pipeline *pipeline, static inline int pipeline_try_set_state_ready(struct p4tc_pipeline *pipeline, struct netlink_ext_ack *extack) { + int ret; + if (pipeline->curr_tables != pipeline->num_tables) { NL_SET_ERR_MSG(extack, "Must have all table defined to update state to ready"); return -EINVAL; } + ret = p4tc_table_try_set_state_ready(pipeline, extack); + if (ret < 0) + return ret; + pipeline->p_state = P4TC_STATE_READY; return true; } -static inline bool p4tc_pipeline_sealed(struct p4tc_pipeline *pipeline) -{ - return pipeline->p_state == P4TC_STATE_READY; -} - struct p4tc_pipeline *p4tc_pipeline_find_byid(struct net *net, const u32 pipeid) { struct p4tc_pipeline_net *pipe_net; @@ -257,6 +263,9 @@ static struct p4tc_pipeline *p4tc_pipeline_create(struct net *net, idr_init(&pipeline->p_act_idr); + idr_init(&pipeline->p_tbl_idr); + pipeline->curr_tables = 0; + pipeline->num_created_acts = 0; pipeline->p_state = P4TC_STATE_NOT_READY; diff --git a/net/sched/p4tc/p4tc_table.c b/net/sched/p4tc/p4tc_table.c new file mode 100644 index 000000000..ac6c28e2d --- /dev/null +++ b/net/sched/p4tc/p4tc_table.c @@ -0,0 +1,1542 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_table.c P4 TC TABLE + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int __p4tc_table_try_set_state_ready(struct p4tc_table *table, + struct netlink_ext_ack *extack) +{ + struct p4tc_table_entry_mask __rcu **masks_array; + unsigned long *tbl_free_masks_bitmap; + + masks_array = kcalloc(table->tbl_max_masks, + sizeof(*table->tbl_masks_array), + GFP_KERNEL); + if (!masks_array) + return -ENOMEM; + + tbl_free_masks_bitmap = + bitmap_alloc(P4TC_MAX_TMASKS, GFP_KERNEL); + if (!tbl_free_masks_bitmap) { + kfree(masks_array); + return -ENOMEM; + } + + bitmap_fill(tbl_free_masks_bitmap, P4TC_MAX_TMASKS); + + table->tbl_masks_array = masks_array; + rcu_replace_pointer_rtnl(table->tbl_free_masks_bitmap, + tbl_free_masks_bitmap); + + return 0; +} + +static void free_table_cache_array(struct p4tc_table **set_tables, + int num_tables) +{ + int i; + + for (i = 0; i < num_tables; i++) { + struct p4tc_table_entry_mask __rcu **masks_array; + struct p4tc_table *table = set_tables[i]; + unsigned long *free_masks_bitmap; + + masks_array = table->tbl_masks_array; + + kfree(masks_array); + free_masks_bitmap = + rtnl_dereference(table->tbl_free_masks_bitmap); + bitmap_free(free_masks_bitmap); + } +} + +int p4tc_table_try_set_state_ready(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + struct p4tc_table **set_tables; + struct p4tc_table *table; + unsigned long tmp, id; + int i = 0; + int ret; + + set_tables = kcalloc(pipeline->num_tables, sizeof(*set_tables), + GFP_KERNEL); + if (!set_tables) + return -ENOMEM; + + idr_for_each_entry_ul(&pipeline->p_tbl_idr, table, tmp, id) { + ret = __p4tc_table_try_set_state_ready(table, extack); + if (ret < 0) + goto free_set_tables; + set_tables[i] = table; + i++; + } + kfree(set_tables); + + return 0; + +free_set_tables: + free_table_cache_array(set_tables, i); + kfree(set_tables); + return ret; +} + +static const struct nla_policy p4tc_table_policy[P4TC_TABLE_MAX + 1] = { + [P4TC_TABLE_NAME] = { .type = NLA_STRING, .len = P4TC_TABLE_NAMSIZ }, + [P4TC_TABLE_INFO] = + NLA_POLICY_EXACT_LEN(sizeof(struct p4tc_table_parm)), + [P4TC_TABLE_DEFAULT_HIT] = { .type = NLA_NESTED }, + [P4TC_TABLE_DEFAULT_MISS] = { .type = NLA_NESTED }, + [P4TC_TABLE_ACTS_LIST] = { .type = NLA_NESTED }, + [P4TC_TABLE_CONST_ENTRY] = { .type = NLA_NESTED }, +}; + +static int _p4tc_table_fill_nlmsg(struct sk_buff *skb, struct p4tc_table *table) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_table_parm parm = {0}; + struct p4tc_table_perm *tbl_perm; + struct p4tc_table_act *table_act; + struct nlattr *nested_tbl_acts; + struct nlattr *default_missact; + struct nlattr *default_hitact; + struct nlattr *nested_count; + struct nlattr *nest; + int i = 1; + + if (nla_put_u32(skb, P4TC_PATH, table->tbl_id)) + goto out_nlmsg_trim; + + nest = nla_nest_start(skb, P4TC_PARAMS); + if (!nest) + goto out_nlmsg_trim; + + if (nla_put_string(skb, P4TC_TABLE_NAME, table->common.name)) + goto out_nlmsg_trim; + + parm.tbl_keysz = table->tbl_keysz; + parm.tbl_max_entries = table->tbl_max_entries; + parm.tbl_max_masks = table->tbl_max_masks; + parm.tbl_type = table->tbl_type; + parm.tbl_aging = table->tbl_aging; + + tbl_perm = rcu_dereference_rtnl(table->tbl_permissions); + parm.tbl_permissions = tbl_perm->permissions; + + if (table->tbl_default_hitact) { + struct p4tc_table_defact *hitact; + + default_hitact = nla_nest_start(skb, P4TC_TABLE_DEFAULT_HIT); + rcu_read_lock(); + hitact = rcu_dereference_rtnl(table->tbl_default_hitact); + if (hitact->default_acts) { + struct nlattr *nest_defact; + + nest_defact = nla_nest_start(skb, + P4TC_TABLE_DEFAULT_ACTION); + if (tcf_action_dump(skb, hitact->default_acts, 0, 0, + false) < 0) { + rcu_read_unlock(); + goto out_nlmsg_trim; + } + nla_nest_end(skb, nest_defact); + } + if (nla_put_u16(skb, P4TC_TABLE_DEFAULT_PERMISSIONS, + hitact->permissions) < 0) { + rcu_read_unlock(); + goto out_nlmsg_trim; + } + rcu_read_unlock(); + nla_nest_end(skb, default_hitact); + } + + if (table->tbl_default_missact) { + struct p4tc_table_defact *missact; + + default_missact = nla_nest_start(skb, P4TC_TABLE_DEFAULT_MISS); + rcu_read_lock(); + missact = rcu_dereference_rtnl(table->tbl_default_missact); + if (missact->default_acts) { + struct nlattr *nest_defact; + + nest_defact = nla_nest_start(skb, + P4TC_TABLE_DEFAULT_ACTION); + if (tcf_action_dump(skb, missact->default_acts, 0, 0, + false) < 0) { + rcu_read_unlock(); + goto out_nlmsg_trim; + } + nla_nest_end(skb, nest_defact); + } + if (nla_put_u16(skb, P4TC_TABLE_DEFAULT_PERMISSIONS, + missact->permissions) < 0) { + rcu_read_unlock(); + goto out_nlmsg_trim; + } + rcu_read_unlock(); + nla_nest_end(skb, default_missact); + } + + nested_tbl_acts = nla_nest_start(skb, P4TC_TABLE_ACTS_LIST); + list_for_each_entry(table_act, &table->tbl_acts_list, node) { + nested_count = nla_nest_start(skb, i); + if (nla_put_string(skb, P4TC_TABLE_ACT_NAME, + table_act->ops->kind) < 0) + goto out_nlmsg_trim; + if (nla_put_u32(skb, P4TC_TABLE_ACT_FLAGS, + table_act->flags) < 0) + goto out_nlmsg_trim; + + nla_nest_end(skb, nested_count); + i++; + } + nla_nest_end(skb, nested_tbl_acts); + + if (nla_put(skb, P4TC_TABLE_INFO, sizeof(parm), &parm)) + goto out_nlmsg_trim; + nla_nest_end(skb, nest); + + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return -1; +} + +static int p4tc_table_fill_nlmsg(struct net *net, struct sk_buff *skb, + struct p4tc_template_common *template, + struct netlink_ext_ack *extack) +{ + struct p4tc_table *table = p4tc_to_table(template); + + if (_p4tc_table_fill_nlmsg(skb, table) <= 0) { + NL_SET_ERR_MSG(extack, + "Failed to fill notification attributes for table"); + return -EINVAL; + } + + return 0; +} + +static inline void p4tc_table_defact_destroy(struct p4tc_table_defact *defact) +{ + if (defact) { + p4tc_action_destroy(defact->default_acts); + kfree(defact); + } +} + +static void p4tc_table_acts_list_destroy(struct list_head *acts_list) +{ + struct p4tc_table_act *table_act, *tmp; + + list_for_each_entry_safe(table_act, tmp, acts_list, node) { + struct p4tc_act *act; + + act = container_of(table_act->ops, typeof(*act), ops); + list_del(&table_act->node); + kfree(table_act); + p4tc_action_put_ref(act); + } +} + +static void p4tc_table_acts_list_replace(struct list_head *orig, + struct list_head *acts_list) +{ + struct p4tc_table_act *table_act, *tmp; + + p4tc_table_acts_list_destroy(orig); + + list_for_each_entry_safe(table_act, tmp, acts_list, node) { + list_del_init(&table_act->node); + list_add_tail(&table_act->node, orig); + } +} + +static void __p4tc_table_put_mask_array(struct p4tc_table *table) +{ + unsigned long *free_masks_bitmap; + + kfree(table->tbl_masks_array); + + free_masks_bitmap = rcu_dereference_rtnl(table->tbl_free_masks_bitmap); + bitmap_free(free_masks_bitmap); +} + +void p4tc_table_put_mask_array(struct p4tc_pipeline *pipeline) +{ + struct p4tc_table *table; + unsigned long tmp, id; + + idr_for_each_entry_ul(&pipeline->p_tbl_idr, table, tmp, id) { + __p4tc_table_put_mask_array(table); + } +} + +static int _p4tc_table_put(struct net *net, struct nlattr **tb, + struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct netlink_ext_ack *extack) +{ + bool default_act_del = false; + struct p4tc_table_perm *perm; + + if (tb) + default_act_del = tb[P4TC_TABLE_DEFAULT_HIT] || + tb[P4TC_TABLE_DEFAULT_MISS]; + + if (!default_act_del) { + if (!refcount_dec_if_one(&table->tbl_ctrl_ref)) { + NL_SET_ERR_MSG(extack, + "Unable to delete referenced table"); + return -EBUSY; + } + } + + if (tb && tb[P4TC_TABLE_DEFAULT_HIT]) { + struct p4tc_table_defact *hitact; + + rcu_read_lock(); + hitact = rcu_dereference(table->tbl_default_hitact); + if (hitact && !p4tc_ctrl_delete_ok(hitact->permissions)) { + NL_SET_ERR_MSG(extack, + "Permission denied: Unable to delete default hitact"); + rcu_read_unlock(); + return -EPERM; + } + rcu_read_unlock(); + } + + if (tb && tb[P4TC_TABLE_DEFAULT_MISS]) { + struct p4tc_table_defact *missact; + + rcu_read_lock(); + missact = rcu_dereference(table->tbl_default_missact); + if (missact && !p4tc_ctrl_delete_ok(missact->permissions)) { + NL_SET_ERR_MSG(extack, + "Permission denied: Unable to delete default missact"); + rcu_read_unlock(); + return -EPERM; + } + rcu_read_unlock(); + } + + if (!default_act_del || tb[P4TC_TABLE_DEFAULT_HIT]) { + struct p4tc_table_defact *hitact; + + hitact = rtnl_dereference(table->tbl_default_hitact); + if (hitact) { + rcu_replace_pointer_rtnl(table->tbl_default_hitact, + NULL); + synchronize_rcu(); + p4tc_table_defact_destroy(hitact); + } + } + + if (!default_act_del || tb[P4TC_TABLE_DEFAULT_MISS]) { + struct p4tc_table_defact *missact; + + missact = rtnl_dereference(table->tbl_default_missact); + if (missact) { + rcu_replace_pointer_rtnl(table->tbl_default_missact, + NULL); + synchronize_rcu(); + p4tc_table_defact_destroy(missact); + } + } + + if (default_act_del) + return 0; + + p4tc_table_acts_list_destroy(&table->tbl_acts_list); + + idr_destroy(&table->tbl_masks_idr); + idr_destroy(&table->tbl_prio_idr); + + perm = rcu_replace_pointer_rtnl(table->tbl_permissions, NULL); + kfree_rcu(perm, rcu); + + idr_remove(&pipeline->p_tbl_idr, table->tbl_id); + pipeline->curr_tables -= 1; + + __p4tc_table_put_mask_array(table); + + kfree(table); + + return 0; +} + +static int p4tc_table_put(struct p4tc_pipeline *pipeline, + struct p4tc_template_common *tmpl, + struct netlink_ext_ack *extack) +{ + struct p4tc_table *table = p4tc_to_table(tmpl); + + return _p4tc_table_put(pipeline->net, NULL, pipeline, table, extack); +} + +struct p4tc_table *p4tc_table_find_byid(struct p4tc_pipeline *pipeline, + const u32 tbl_id) +{ + return idr_find(&pipeline->p_tbl_idr, tbl_id); +} + +static struct p4tc_table *p4tc_table_find_byname(const char *tblname, + struct p4tc_pipeline *pipeline) +{ + struct p4tc_table *table; + unsigned long tmp, id; + + idr_for_each_entry_ul(&pipeline->p_tbl_idr, table, tmp, id) + if (strncmp(table->common.name, tblname, + P4TC_TABLE_NAMSIZ) == 0) + return table; + + return NULL; +} + +struct p4tc_table *p4tc_table_find_byany(struct p4tc_pipeline *pipeline, + const char *tblname, const u32 tbl_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_table *table; + int err; + + if (tbl_id) { + table = p4tc_table_find_byid(pipeline, tbl_id); + if (!table) { + NL_SET_ERR_MSG(extack, "Unable to find table by id"); + err = -EINVAL; + goto out; + } + } else { + if (tblname) { + table = p4tc_table_find_byname(tblname, pipeline); + if (!table) { + NL_SET_ERR_MSG(extack, "Table name not found"); + err = -EINVAL; + goto out; + } + } else { + NL_SET_ERR_MSG(extack, "Must specify table name or id"); + err = -EINVAL; + goto out; + } + } + + return table; +out: + return ERR_PTR(err); +} + +static int p4tc_table_get(struct p4tc_table *table) +{ + return refcount_inc_not_zero(&table->tbl_ctrl_ref); +} + +struct p4tc_table *p4tc_table_find_get(struct p4tc_pipeline *pipeline, + const char *tblname, const u32 tbl_id, + struct netlink_ext_ack *extack) +{ + struct p4tc_table *table; + + table = p4tc_table_find_byany(pipeline, tblname, tbl_id, extack); + if (IS_ERR(table)) + return table; + + if (!p4tc_table_get(table)) { + NL_SET_ERR_MSG(extack, "Table is marked for deletion"); + return ERR_PTR(-EBUSY); + } + + return table; +} + +/* Permissions can also be updated by runtime command */ +static int __p4tc_table_init_default_act(struct net *net, struct nlattr **tb, + struct p4tc_table_defact **default_act, + u32 pipeid, __u16 curr_permissions, + struct netlink_ext_ack *extack) +{ + int ret; + + *default_act = kzalloc(sizeof(**default_act), GFP_KERNEL); + if (!(*default_act)) + return -ENOMEM; + + if (tb[P4TC_TABLE_DEFAULT_PERMISSIONS]) { + __u16 *permissions; + + permissions = nla_data(tb[P4TC_TABLE_DEFAULT_PERMISSIONS]); + if (!p4tc_ctrl_read_ok(*permissions)) { + NL_SET_ERR_MSG(extack, + "Default action must have ctrl path read permissions"); + ret = -EINVAL; + goto default_act_free; + } + if (!p4tc_data_read_ok(*permissions)) { + NL_SET_ERR_MSG(extack, + "Default action must have data path read permissions"); + ret = -EINVAL; + goto default_act_free; + } + if (!p4tc_data_exec_ok(*permissions)) { + NL_SET_ERR_MSG(extack, + "Default action must have data path execute permissions"); + ret = -EINVAL; + goto default_act_free; + } + (*default_act)->permissions = *permissions; + } else { + (*default_act)->permissions = curr_permissions; + } + + if (tb[P4TC_TABLE_DEFAULT_ACTION]) { + struct tc_action **default_acts; + + if (!p4tc_ctrl_update_ok(curr_permissions)) { + NL_SET_ERR_MSG(extack, + "Permission denied: Unable to update default hit action"); + ret = -EPERM; + goto default_act_free; + } + + default_acts = kcalloc(TCA_ACT_MAX_PRIO, + sizeof(struct tc_action *), GFP_KERNEL); + if (!default_acts) { + ret = -ENOMEM; + goto default_act_free; + } + + ret = p4tc_action_init(net, tb[P4TC_TABLE_DEFAULT_ACTION], + default_acts, pipeid, 0, extack); + if (ret < 0) { + kfree(default_acts); + goto default_act_free; + } else if (ret > 1) { + NL_SET_ERR_MSG(extack, "Can only have one hit action"); + p4tc_action_destroy(default_acts); + ret = -EINVAL; + goto default_act_free; + } + (*default_act)->default_acts = default_acts; + } + + return 0; + +default_act_free: + kfree(*default_act); + + return ret; +} + +static int p4tc_table_check_defacts(struct tc_action *defact, + struct list_head *acts_list) +{ + struct p4tc_table_act *table_act; + + list_for_each_entry(table_act, acts_list, node) { + if (table_act->ops->id == defact->ops->id && + !(table_act->flags & BIT(P4TC_TABLE_ACTS_TABLE_ONLY))) + return true; + } + + return false; +} + +static struct nla_policy p4tc_table_default_policy[P4TC_TABLE_DEFAULT_MAX + 1] = { + [P4TC_TABLE_DEFAULT_ACTION] = { .type = NLA_NESTED }, + [P4TC_TABLE_DEFAULT_PERMISSIONS] = + NLA_POLICY_MAX(NLA_U16, P4TC_MAX_PERMISSION), +}; + +/* Runtime and template call this */ +static int +p4tc_table_init_default_act(struct net *net, struct nlattr *nla, + struct p4tc_table *table, + u16 curr_permissions, + struct p4tc_table_defact **default_act, + struct list_head *acts_list, + struct netlink_ext_ack *extack) +{ + u16 permissions = P4TC_CONTROL_PERMISSIONS | P4TC_DATA_PERMISSIONS; + struct nlattr *tb[P4TC_TABLE_DEFAULT_MAX + 1]; + int ret; + + if (curr_permissions) + permissions = curr_permissions; + + ret = nla_parse_nested(tb, P4TC_TABLE_DEFAULT_MAX, nla, + p4tc_table_default_policy, extack); + if (ret < 0) + return ret; + + if (!tb[P4TC_TABLE_DEFAULT_ACTION] && + !tb[P4TC_TABLE_DEFAULT_PERMISSIONS]) + return 0; + + ret = __p4tc_table_init_default_act(net, tb, + default_act, + table->common.p_id, permissions, + extack); + if (ret < 0) + return ret; + if ((*default_act)->default_acts && + !p4tc_table_check_defacts((*default_act)->default_acts[0], + acts_list)) { + NL_SET_ERR_MSG(extack, + "Action is not allowed as default hit action"); + p4tc_table_defact_destroy(*default_act); + return -EPERM; + } + + return 0; +} + +struct p4tc_table_perm * +p4tc_table_init_permissions(struct p4tc_table *table, u16 permissions, + struct netlink_ext_ack *extack) +{ + struct p4tc_table_perm *tbl_perm; + int ret; + + if (permissions > P4TC_MAX_PERMISSION) { + NL_SET_ERR_MSG(extack, + "Permission may only have 14 bits turned on"); + ret = -EINVAL; + goto out; + } + + tbl_perm = kzalloc(sizeof(*tbl_perm), GFP_KERNEL); + if (!tbl_perm) { + ret = -ENOMEM; + goto out; + } + + tbl_perm->permissions = permissions; + + return tbl_perm; + +out: + return ERR_PTR(ret); +} + +void p4tc_table_replace_permissions(struct p4tc_table *table, + struct p4tc_table_perm *tbl_perm, + bool lock_rtnl) +{ + if (!tbl_perm) + return; + + if (lock_rtnl) + rtnl_lock(); + tbl_perm = rcu_replace_pointer_rtnl(table->tbl_permissions, tbl_perm); + if (lock_rtnl) + rtnl_unlock(); + kfree_rcu(tbl_perm, rcu); +} + +int +p4tc_table_init_default_acts(struct net *net, + struct p4tc_table_default_act_params *def_params, + struct p4tc_table *table, + struct list_head *acts_list, + struct netlink_ext_ack *extack) +{ + u16 permissions; + int ret; + + def_params->default_missact = NULL; + def_params->default_hitact = NULL; + + if (def_params->default_hit_attr) { + struct p4tc_table_defact *tmp_default_hitact; + + permissions = P4TC_CONTROL_PERMISSIONS | P4TC_DATA_PERMISSIONS; + + rcu_read_lock(); + if (table->tbl_default_hitact) { + tmp_default_hitact = rcu_dereference(table->tbl_default_hitact); + permissions = tmp_default_hitact->permissions; + } + rcu_read_unlock(); + + ret = p4tc_table_init_default_act(net, + def_params->default_hit_attr, + table, permissions, + &def_params->default_hitact, + acts_list, extack); + if (ret < 0) + return ret; + } + + if (def_params->default_miss_attr) { + struct p4tc_table_defact *tmp_default_missact; + + permissions = P4TC_CONTROL_PERMISSIONS | P4TC_DATA_PERMISSIONS; + + rcu_read_lock(); + if (table->tbl_default_missact) { + tmp_default_missact = rcu_dereference(table->tbl_default_missact); + permissions = tmp_default_missact->permissions; + } + rcu_read_unlock(); + + ret = p4tc_table_init_default_act(net, + def_params->default_miss_attr, + table, permissions, + &def_params->default_missact, + acts_list, extack); + if (ret < 0) + goto default_hitacts_free; + } + + return 0; + +default_hitacts_free: + p4tc_table_defact_destroy(def_params->default_hitact); + + return ret; +} + +static const struct nla_policy p4tc_acts_list_policy[P4TC_TABLE_MAX + 1] = { + [P4TC_TABLE_ACT_FLAGS] = + NLA_POLICY_RANGE(NLA_U8, 0, BIT(P4TC_TABLE_ACTS_FLAGS_MAX)), + [P4TC_TABLE_ACT_NAME] = { .type = NLA_STRING, .len = ACTNAMSIZ }, +}; + +static struct p4tc_table_act *p4tc_table_act_init(struct nlattr *nla, + struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_TABLE_ACT_MAX + 1]; + struct p4tc_table_act *table_act; + int ret; + + ret = nla_parse_nested(tb, P4TC_TABLE_ACT_MAX, nla, + p4tc_acts_list_policy, extack); + if (ret < 0) + return ERR_PTR(ret); + + table_act = kzalloc(sizeof(*table_act), GFP_KERNEL); + if (unlikely(!table_act)) + return ERR_PTR(-ENOMEM); + + if (tb[P4TC_TABLE_ACT_NAME]) { + const char *fullname = nla_data(tb[P4TC_TABLE_ACT_NAME]); + char *pname, *aname, actname[ACTNAMSIZ]; + struct p4tc_act *act; + + nla_strscpy(actname, tb[P4TC_TABLE_ACT_NAME], ACTNAMSIZ); + aname = actname; + + pname = strsep(&aname, "/"); + if (!aname) { + NL_SET_ERR_MSG(extack, + "Action name must have format pname/actname"); + ret = -EINVAL; + goto free_table_act; + } + + if (strncmp(pipeline->common.name, pname, P4TC_PIPELINE_NAMSIZ)) { + NL_SET_ERR_MSG_FMT(extack, "Pipeline name must be %s\n", + pipeline->common.name); + ret = -EINVAL; + goto free_table_act; + } + + act = p4a_tmpl_get(pipeline, fullname, 0, extack); + if (IS_ERR(act)) { + ret = PTR_ERR(act); + goto free_table_act; + } + + table_act->ops = &act->ops; + } else { + NL_SET_ERR_MSG(extack, + "Must specify allowed table action name"); + ret = -EINVAL; + goto free_table_act; + } + + if (tb[P4TC_TABLE_ACT_FLAGS]) { + u8 *flags = nla_data(tb[P4TC_TABLE_ACT_FLAGS]); + + table_act->flags = *flags; + } + + return table_act; + +free_table_act: + kfree(table_act); + return ERR_PTR(ret); +} + +void +p4tc_table_replace_default_acts(struct p4tc_table *table, + struct p4tc_table_default_act_params *def_params, + bool lock_rtnl) +{ + if (def_params->default_hitact) { + bool updated_actions = !!def_params->default_hitact->default_acts; + struct p4tc_table_defact *hitact; + + if (lock_rtnl) + rtnl_lock(); + if (!updated_actions) { + hitact = rcu_dereference_rtnl(table->tbl_default_hitact); + p4tc_table_defacts_acts_copy(def_params->default_hitact, + hitact); + } + hitact = rcu_replace_pointer_rtnl(table->tbl_default_hitact, + def_params->default_hitact); + if (lock_rtnl) + rtnl_unlock(); + if (hitact) { + synchronize_rcu(); + if (updated_actions) + p4tc_table_defact_destroy(hitact); + else + kfree(hitact); + } + } + + if (def_params->default_missact) { + bool updated_actions = !!def_params->default_missact->default_acts; + struct p4tc_table_defact *missact; + + if (lock_rtnl) + rtnl_lock(); + if (!updated_actions) { + missact = rcu_dereference_rtnl(table->tbl_default_missact); + p4tc_table_defacts_acts_copy(def_params->default_missact, + missact); + } + missact = rcu_replace_pointer_rtnl(table->tbl_default_missact, + def_params->default_missact); + if (lock_rtnl) + rtnl_unlock(); + if (missact) { + synchronize_rcu(); + if (updated_actions) + p4tc_table_defact_destroy(missact); + else + kfree(missact); + } + } +} + +static int p4tc_table_acts_list_init(struct nlattr *nla, + struct p4tc_pipeline *pipeline, + struct list_head *acts_list, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MSGBATCH_SIZE + 1]; + struct p4tc_table_act *table_act; + int ret; + int i; + + ret = nla_parse_nested(tb, P4TC_MSGBATCH_SIZE, nla, NULL, extack); + if (ret < 0) + return ret; + + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && tb[i]; i++) { + table_act = p4tc_table_act_init(tb[i], pipeline, extack); + if (IS_ERR(table_act)) { + ret = PTR_ERR(table_act); + goto free_acts_list_list; + } + list_add_tail(&table_act->node, acts_list); + } + + return 0; + +free_acts_list_list: + p4tc_table_acts_list_destroy(acts_list); + + return ret; +} + +static struct p4tc_table * +p4tc_table_find_byanyattr(struct p4tc_pipeline *pipeline, + struct nlattr *name_attr, const u32 tbl_id, + struct netlink_ext_ack *extack) +{ + char *tblname = NULL; + + if (name_attr) + tblname = nla_data(name_attr); + + return p4tc_table_find_byany(pipeline, tblname, tbl_id, extack); +} + +static struct p4tc_table *p4tc_table_create(struct net *net, struct nlattr **tb, + u32 tbl_id, + struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + struct p4tc_table_default_act_params def_params = {0}; + struct p4tc_table_perm *tbl_init_perms = NULL; + struct p4tc_table_parm *parm; + struct p4tc_table *table; + char *tblname; + int ret; + + if (pipeline->curr_tables == pipeline->num_tables) { + NL_SET_ERR_MSG(extack, + "Table range exceeded max allowed value"); + ret = -EINVAL; + goto out; + } + + /* Name has the following syntax cb/tname */ + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_TABLE_NAME)) { + NL_SET_ERR_MSG(extack, "Must specify table name"); + ret = -EINVAL; + goto out; + } + + tblname = + strnchr(nla_data(tb[P4TC_TABLE_NAME]), P4TC_TABLE_NAMSIZ, '/'); + if (!tblname) { + NL_SET_ERR_MSG(extack, "Table name must contain control block"); + ret = -EINVAL; + goto out; + } + + tblname += 1; + if (tblname[0] == '\0') { + NL_SET_ERR_MSG(extack, "Control block name is too big"); + ret = -EINVAL; + goto out; + } + + table = p4tc_table_find_byanyattr(pipeline, tb[P4TC_TABLE_NAME], tbl_id, + NULL); + if (!IS_ERR(table)) { + NL_SET_ERR_MSG(extack, "Table already exists"); + ret = -EEXIST; + goto out; + } + + table = kzalloc(sizeof(*table), GFP_KERNEL); + if (!table) { + NL_SET_ERR_MSG(extack, "Unable to create table"); + ret = -ENOMEM; + goto out; + } + + table->common.p_id = pipeline->common.p_id; + strscpy(table->common.name, nla_data(tb[P4TC_TABLE_NAME]), + P4TC_TABLE_NAMSIZ); + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_TABLE_INFO)) { + ret = -EINVAL; + NL_SET_ERR_MSG(extack, "Missing table info"); + goto free; + } + + parm = nla_data(tb[P4TC_TABLE_INFO]); + if (!parm->tbl_keysz) { + NL_SET_ERR_MSG(extack, "Table keysz cannot be zero"); + ret = -EINVAL; + goto free; + } + if (parm->tbl_keysz > P4TC_MAX_KEYSZ) { + NL_SET_ERR_MSG(extack, + "Table keysz exceeds maximum keysz"); + ret = -EINVAL; + goto free; + } + table->tbl_keysz = parm->tbl_keysz; + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_MAX_ENTRIES) { + if (!parm->tbl_max_entries) { + NL_SET_ERR_MSG(extack, + "Table max_entries cannot be zero"); + ret = -EINVAL; + goto free; + } + if (parm->tbl_max_entries > P4TC_MAX_TENTRIES) { + NL_SET_ERR_MSG(extack, + "Table max_entries exceeds maximum value"); + ret = -EINVAL; + goto free; + } + table->tbl_max_entries = parm->tbl_max_entries; + } else { + table->tbl_max_entries = P4TC_DEFAULT_TENTRIES; + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_MAX_MASKS) { + if (!parm->tbl_max_masks) { + NL_SET_ERR_MSG(extack, + "Table max_masks cannot be zero"); + ret = -EINVAL; + goto free; + } + if (parm->tbl_max_masks > P4TC_MAX_TMASKS) { + NL_SET_ERR_MSG(extack, + "Table max_masks exceeds maximum value"); + ret = -EINVAL; + goto free; + } + table->tbl_max_masks = parm->tbl_max_masks; + } else { + table->tbl_max_masks = P4TC_DEFAULT_TMASKS; + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_PERMISSIONS) { + u16 tbl_perms = parm->tbl_permissions; + + tbl_init_perms = p4tc_table_init_permissions(table, tbl_perms, + extack); + if (IS_ERR(tbl_init_perms)) { + ret = PTR_ERR(tbl_init_perms); + goto free; + } + rcu_assign_pointer(table->tbl_permissions, tbl_init_perms); + } else { + u16 tbl_perms = P4TC_TABLE_PERMISSIONS; + + tbl_init_perms = p4tc_table_init_permissions(table, + tbl_perms, + extack); + if (IS_ERR(tbl_init_perms)) { + ret = PTR_ERR(tbl_init_perms); + goto free; + } + rcu_assign_pointer(table->tbl_permissions, tbl_init_perms); + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_TYPE) { + if (parm->tbl_type > P4TC_TABLE_TYPE_MAX) { + NL_SET_ERR_MSG(extack, "Table type must be Exact / LPM / Ternary"); + ret = -EINVAL; + goto free_permissions; + } + table->tbl_type = parm->tbl_type; + } else { + table->tbl_type = P4TC_TABLE_TYPE_EXACT; + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_AGING) { + if (!parm->tbl_aging) { + NL_SET_ERR_MSG(extack, + "Table aging can't be zero"); + ret = -EINVAL; + goto free; + } + if (parm->tbl_aging > P4TC_MAX_T_AGING_MS) { + NL_SET_ERR_MSG(extack, + "Table aging exceeds maximum value"); + ret = -EINVAL; + goto free; + } + table->tbl_aging = parm->tbl_aging; + } else { + table->tbl_aging = P4TC_DEFAULT_T_AGING_MS; + } + + refcount_set(&table->tbl_ctrl_ref, 1); + + if (tbl_id) { + table->tbl_id = tbl_id; + ret = idr_alloc_u32(&pipeline->p_tbl_idr, table, &table->tbl_id, + table->tbl_id, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate table id"); + goto free_permissions; + } + } else { + table->tbl_id = 1; + ret = idr_alloc_u32(&pipeline->p_tbl_idr, table, &table->tbl_id, + UINT_MAX, GFP_KERNEL); + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Unable to allocate table id"); + goto free_permissions; + } + } + + INIT_LIST_HEAD(&table->tbl_acts_list); + if (tb[P4TC_TABLE_ACTS_LIST]) { + ret = p4tc_table_acts_list_init(tb[P4TC_TABLE_ACTS_LIST], + pipeline, &table->tbl_acts_list, + extack); + if (ret < 0) + goto idr_rm; + } + + def_params.default_hit_attr = tb[P4TC_TABLE_DEFAULT_HIT]; + def_params.default_miss_attr = tb[P4TC_TABLE_DEFAULT_MISS]; + + ret = p4tc_table_init_default_acts(net, &def_params, table, + &table->tbl_acts_list, extack); + if (ret < 0) + goto idr_rm; + + rcu_replace_pointer_rtnl(table->tbl_default_hitact, + def_params.default_hitact); + rcu_replace_pointer_rtnl(table->tbl_default_missact, + def_params.default_missact); + + if (def_params.default_hitact && + !def_params.default_hitact->default_acts) { + NL_SET_ERR_MSG(extack, + "Must specify defaults_hit_actions's action values"); + ret = -EINVAL; + goto defaultacts_destroy; + } + + if (def_params.default_missact && + !def_params.default_missact->default_acts) { + NL_SET_ERR_MSG(extack, + "Must specify defaults_miss_actions's action values"); + ret = -EINVAL; + goto defaultacts_destroy; + } + + idr_init(&table->tbl_masks_idr); + idr_init(&table->tbl_prio_idr); + spin_lock_init(&table->tbl_masks_idr_lock); + + pipeline->curr_tables += 1; + + table->common.ops = (struct p4tc_template_ops *)&p4tc_table_ops; + + return table; + +defaultacts_destroy: + p4tc_table_defact_destroy(def_params.default_hitact); + p4tc_table_defact_destroy(def_params.default_missact); + +idr_rm: + idr_remove(&pipeline->p_tbl_idr, table->tbl_id); + +free_permissions: + kfree(tbl_init_perms); + + p4tc_table_acts_list_destroy(&table->tbl_acts_list); + +free: + kfree(table); + +out: + return ERR_PTR(ret); +} + +static struct p4tc_table *p4tc_table_update(struct net *net, struct nlattr **tb, + u32 tbl_id, + struct p4tc_pipeline *pipeline, + u32 flags, + struct netlink_ext_ack *extack) +{ + u32 tbl_max_masks = 0, tbl_max_entries = 0, tbl_keysz = 0; + struct p4tc_table_default_act_params def_params = {0}; + struct list_head *tbl_acts_list = NULL; + struct p4tc_table_perm *perm = NULL; + struct p4tc_table_parm *parm = NULL; + struct p4tc_table *table; + u64 tbl_aging = 0; + u8 tbl_type; + int ret = 0; + + table = p4tc_table_find_byanyattr(pipeline, tb[P4TC_TABLE_NAME], tbl_id, + extack); + if (IS_ERR(table)) + return table; + + /* Check if we are replacing this at the end */ + if (tb[P4TC_TABLE_ACTS_LIST]) { + tbl_acts_list = kzalloc(sizeof(*tbl_acts_list), GFP_KERNEL); + if (!tbl_acts_list) { + ret = -ENOMEM; + goto out; + } + INIT_LIST_HEAD(tbl_acts_list); + ret = p4tc_table_acts_list_init(tb[P4TC_TABLE_ACTS_LIST], + pipeline, tbl_acts_list, extack); + if (ret < 0) + goto table_acts_destroy; + } + + def_params.default_hit_attr = tb[P4TC_TABLE_DEFAULT_HIT]; + def_params.default_miss_attr = tb[P4TC_TABLE_DEFAULT_MISS]; + + if (tbl_acts_list) + ret = p4tc_table_init_default_acts(net, &def_params, table, + tbl_acts_list, extack); + else + ret = p4tc_table_init_default_acts(net, &def_params, table, + &table->tbl_acts_list, + extack); + if (ret < 0) + goto table_acts_destroy; + + tbl_type = table->tbl_type; + + if (tb[P4TC_TABLE_INFO]) { + parm = nla_data(tb[P4TC_TABLE_INFO]); + if (parm->tbl_flags & P4TC_TABLE_FLAGS_KEYSZ) { + if (!parm->tbl_keysz) { + NL_SET_ERR_MSG(extack, + "Table keysz cannot be zero"); + ret = -EINVAL; + goto defaultacts_destroy; + } + if (parm->tbl_keysz > P4TC_MAX_KEYSZ) { + NL_SET_ERR_MSG(extack, + "Table keysz exceeds maximum keysz"); + ret = -EINVAL; + goto defaultacts_destroy; + } + tbl_keysz = parm->tbl_keysz; + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_MAX_ENTRIES) { + if (!parm->tbl_max_entries) { + NL_SET_ERR_MSG(extack, + "Table max_entries cannot be zero"); + ret = -EINVAL; + goto defaultacts_destroy; + } + if (parm->tbl_max_entries > P4TC_MAX_TENTRIES) { + NL_SET_ERR_MSG(extack, + "Table max_entries exceeds maximum value"); + ret = -EINVAL; + goto defaultacts_destroy; + } + tbl_max_entries = parm->tbl_max_entries; + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_MAX_MASKS) { + if (!parm->tbl_max_masks) { + NL_SET_ERR_MSG(extack, + "Table max_masks cannot be zero"); + ret = -EINVAL; + goto defaultacts_destroy; + } + if (parm->tbl_max_masks > P4TC_MAX_TMASKS) { + NL_SET_ERR_MSG(extack, + "Table max_masks exceeds maximum value"); + ret = -EINVAL; + goto defaultacts_destroy; + } + tbl_max_masks = parm->tbl_max_masks; + } + if (parm->tbl_flags & P4TC_TABLE_FLAGS_PERMISSIONS) { + perm = p4tc_table_init_permissions(table, + parm->tbl_permissions, + extack); + if (IS_ERR(perm)) { + ret = PTR_ERR(perm); + goto defaultacts_destroy; + } + } + + if (parm->tbl_flags & P4TC_TABLE_FLAGS_TYPE) { + if (parm->tbl_type > P4TC_TABLE_TYPE_MAX) { + NL_SET_ERR_MSG(extack, "Table type can only be exact or LPM"); + ret = -EINVAL; + goto free_perm; + } + tbl_type = parm->tbl_type; + } + if (parm->tbl_flags & P4TC_TABLE_FLAGS_AGING) { + if (!parm->tbl_aging) { + NL_SET_ERR_MSG(extack, + "Table aging can't be zero"); + ret = -EINVAL; + goto free_perm; + } + if (parm->tbl_aging > P4TC_MAX_T_AGING_MS) { + NL_SET_ERR_MSG(extack, + "Table max_masks exceeds maximum value"); + ret = -EINVAL; + goto free_perm; + } + tbl_aging = parm->tbl_aging; + } + } + + p4tc_table_replace_default_acts(table, &def_params, false); + p4tc_table_replace_permissions(table, perm, false); + + if (tbl_keysz) + table->tbl_keysz = tbl_keysz; + if (tbl_max_entries) + table->tbl_max_entries = tbl_max_entries; + if (tbl_max_masks) + table->tbl_max_masks = tbl_max_masks; + table->tbl_type = tbl_type; + if (tbl_aging) + table->tbl_aging = tbl_aging; + + if (tbl_acts_list) + p4tc_table_acts_list_replace(&table->tbl_acts_list, + tbl_acts_list); + + return table; + +free_perm: + kfree(perm); + +defaultacts_destroy: + p4tc_table_defact_destroy(def_params.default_missact); + p4tc_table_defact_destroy(def_params.default_hitact); + +table_acts_destroy: + if (tbl_acts_list) { + p4tc_table_acts_list_destroy(tbl_acts_list); + kfree(tbl_acts_list); + } + +out: + return ERR_PTR(ret); +} + +static struct p4tc_template_common * +p4tc_table_cu(struct net *net, struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + u32 pipeid = ids[P4TC_PID_IDX], tbl_id = ids[P4TC_TBLID_IDX]; + struct nlattr *tb[P4TC_TABLE_MAX + 1]; + struct p4tc_pipeline *pipeline; + struct p4tc_table *table; + int ret; + + pipeline = p4tc_pipeline_find_byany_unsealed(net, nl_path_attrs->pname, + pipeid, extack); + if (IS_ERR(pipeline)) + return (void *)pipeline; + + ret = nla_parse_nested(tb, P4TC_TABLE_MAX, nla, p4tc_table_policy, + extack); + if (ret < 0) + return ERR_PTR(ret); + + switch (n->nlmsg_type) { + case RTM_CREATEP4TEMPLATE: + table = p4tc_table_create(net, tb, tbl_id, pipeline, extack); + break; + case RTM_UPDATEP4TEMPLATE: + table = p4tc_table_update(net, tb, tbl_id, pipeline, + n->nlmsg_flags, extack); + break; + default: + return ERR_PTR(-EOPNOTSUPP); + } + + if (IS_ERR(table)) + goto out; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!ids[P4TC_TBLID_IDX]) + ids[P4TC_TBLID_IDX] = table->tbl_id; + +out: + return (struct p4tc_template_common *)table; +} + +static int p4tc_table_flush(struct net *net, struct sk_buff *skb, + struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) +{ + unsigned char *b = nlmsg_get_pos(skb); + unsigned long tmp, tbl_id; + struct p4tc_table *table; + int ret = 0; + int i = 0; + + if (nla_put_u32(skb, P4TC_PATH, 0)) + goto out_nlmsg_trim; + + if (idr_is_empty(&pipeline->p_tbl_idr)) { + NL_SET_ERR_MSG(extack, "There are no tables to flush"); + goto out_nlmsg_trim; + } + + idr_for_each_entry_ul(&pipeline->p_tbl_idr, table, tmp, tbl_id) { + if (_p4tc_table_put(net, NULL, pipeline, table, extack) < 0) { + ret = -EBUSY; + continue; + } + i++; + } + + if (nla_put_u32(skb, P4TC_COUNT, i)) + goto out_nlmsg_trim; + + if (ret < 0) { + if (i == 0) { + NL_SET_ERR_MSG(extack, "Unable to flush any table"); + goto out_nlmsg_trim; + } else { + NL_SET_ERR_MSG_FMT(extack, + "Flushed only %u tables", i); + } + } + + return i; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static int p4tc_table_gd(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + u32 pipeid = ids[P4TC_PID_IDX], tbl_id = ids[P4TC_TBLID_IDX]; + struct nlattr *tb[P4TC_TABLE_MAX + 1] = {}; + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_pipeline *pipeline; + struct p4tc_table *table; + int ret = 0; + + if (nla) { + ret = nla_parse_nested(tb, P4TC_TABLE_MAX, nla, + p4tc_table_policy, extack); + + if (ret < 0) + return ret; + } + + if (n->nlmsg_type == RTM_GETP4TEMPLATE) + pipeline = p4tc_pipeline_find_byany(net, + nl_path_attrs->pname, + pipeid, + extack); + else + pipeline = p4tc_pipeline_find_byany_unsealed(net, + nl_path_attrs->pname, + pipeid, extack); + + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (n->nlmsg_type == RTM_DELP4TEMPLATE && (n->nlmsg_flags & NLM_F_ROOT)) + return p4tc_table_flush(net, skb, pipeline, extack); + + table = p4tc_table_find_byanyattr(pipeline, tb[P4TC_TABLE_NAME], tbl_id, + extack); + if (IS_ERR(table)) + return PTR_ERR(table); + + if (_p4tc_table_fill_nlmsg(skb, table) < 0) { + NL_SET_ERR_MSG(extack, + "Failed to fill notification attributes for table"); + return -EINVAL; + } + + if (n->nlmsg_type == RTM_DELP4TEMPLATE) { + ret = _p4tc_table_put(net, tb, pipeline, table, extack); + if (ret < 0) + goto out_nlmsg_trim; + } + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static int p4tc_table_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, + struct nlattr *nla, char **p_name, u32 *ids, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(skb->sk); + struct p4tc_pipeline *pipeline; + + if (!ctx->ids[P4TC_PID_IDX]) { + pipeline = p4tc_pipeline_find_byany(net, *p_name, + ids[P4TC_PID_IDX], extack); + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + ctx->ids[P4TC_PID_IDX] = pipeline->common.p_id; + } else { + pipeline = p4tc_pipeline_find_byid(net, ctx->ids[P4TC_PID_IDX]); + } + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!(*p_name)) + *p_name = pipeline->common.name; + + return p4tc_tmpl_generic_dump(skb, ctx, &pipeline->p_tbl_idr, + P4TC_TBLID_IDX, extack); +} + +static int p4tc_table_dump_1(struct sk_buff *skb, + struct p4tc_template_common *common) +{ + struct nlattr *nest = nla_nest_start(skb, P4TC_PARAMS); + struct p4tc_table *table = p4tc_to_table(common); + + if (!nest) + return -ENOMEM; + + if (nla_put_string(skb, P4TC_TABLE_NAME, table->common.name)) { + nla_nest_cancel(skb, nest); + return -ENOMEM; + } + + nla_nest_end(skb, nest); + + return 0; +} + +const struct p4tc_template_ops p4tc_table_ops = { + .init = NULL, + .cu = p4tc_table_cu, + .fill_nlmsg = p4tc_table_fill_nlmsg, + .gd = p4tc_table_gd, + .put = p4tc_table_put, + .dump = p4tc_table_dump, + .dump_1 = p4tc_table_dump_1, +}; diff --git a/net/sched/p4tc/p4tc_tmpl_api.c b/net/sched/p4tc/p4tc_tmpl_api.c index 329ec7bc9..2fc4a0a54 100644 --- a/net/sched/p4tc/p4tc_tmpl_api.c +++ b/net/sched/p4tc/p4tc_tmpl_api.c @@ -43,6 +43,7 @@ static bool obj_is_valid(u32 obj) switch (obj) { case P4TC_OBJ_PIPELINE: case P4TC_OBJ_ACT: + case P4TC_OBJ_TABLE: return true; default: return false; @@ -52,6 +53,7 @@ static bool obj_is_valid(u32 obj) static const struct p4tc_template_ops *p4tc_ops[P4TC_OBJ_MAX + 1] = { [P4TC_OBJ_PIPELINE] = &p4tc_pipeline_ops, [P4TC_OBJ_ACT] = &p4tc_act_ops, + [P4TC_OBJ_TABLE] = &p4tc_table_ops, }; int p4tc_tmpl_generic_dump(struct sk_buff *skb, struct p4tc_dump_ctx *ctx, From patchwork Fri Dec 1 18:29:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476274 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="aVaUe0bn" Received: from mail-qv1-xf2f.google.com (mail-qv1-xf2f.google.com [IPv6:2607:f8b0:4864:20::f2f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2EE512A for ; Fri, 1 Dec 2023 10:29:29 -0800 (PST) Received: by mail-qv1-xf2f.google.com with SMTP id 6a1803df08f44-67a99dbb21fso4563696d6.0 for ; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:27 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 13/15] p4tc: add runtime table entry create, update, get, delete, flush and dump Date: Fri, 1 Dec 2023 13:29:02 -0500 Message-Id: <20231201182904.532825-14-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Tables are conceptually similar to TCAMs and this implementation could be labelled as an "algorithmic" TCAM. Tables have a key of a specific size, maximum number of entries and masks allowed. The basic P4 key types are supported (exact, LPM, ternary, and ranges) although the kernel side is oblivious of all that and sees only bit blobs which it masks before a lookup is performed. This commit allows users to create, update, delete, get, flush and dump table _entries_ (templates were described in earlier patch). Note that table entries can only be created once the pipeline template is sealed. For example, a user issuing the following command: tc p4ctrl create myprog/table/cb/tname \ dstAddr 10.10.10.0/24 srcAddr 192.168.0.0/16 prio 16 \ action send param port port1 indicates we are creating a table entry in table "cb/tname" (a table residing in control block "cb") on a pipeline named "myprog". User space tc will create a key which has a value of 0x0a0a0a00c0a00000 (10.10.10.0 concatenated with 192.168.0.0) and a mask value of 0xffffff00ffff0000 (/24 concatenated with /16) that will be sent to the kernel. In addition a priority field of 16 is passed to the kernel as well as the action definition. The priority field is needed to disambiguate in case two entries match. In that case, the kernel will choose the one with lowest priority number. If the user wanted to, for example, update our just created entry with an action, they'd issue the following command: tc p4ctrl update myprog/table/cb/tname srcAddr 10.10.10.0/24 \ dstAddr 192.168.0.0/16 prio 16 action send param port port5 In this case, the user needs to specify the pipeline name, the table name, the key and the priority, so that we can locate the table entry. If the user wanted to, for example, get the table entry that we just updated, they'd issue the following command: tc p4ctrl get myprog/table/cb/tname srcAddr 10.10.10.0/24 \ dstAddr 192.168.0.0/16 prio 16 Note that, again, we need to specify the pipeline name, the table name, the key and the priority, so that we can locate the table entry. If the user wanted to delete the table entry we created, they'd issue the following command: tc p4ctrl del myprog/table/cb/tname srcAddr 10.10.10.0/24 \ dstAddr 192.168.0.0/16 prio 16 Note that, again, we need to specify the pipeline name, the table name, the key and the priority, so that we can locate the table entry. We can also flush all the table entries from a specific table. To flush the table entries of table tname ane pipeline ptables, the user would issue the following command: tc p4ctrl del myprog/table/cb/tname We can also dump all the table entries from a specific table. To dump the table entries of table tname and pipeline myprog, the user would issue the following command: tc p4ctrl get myprog/table/cb/tname __Table Entry Permissions__ Table entries can have permissions specified when they are being added. Caveat: we are doing a lot more than what P4 defines because we feel it is necessary. It should be noted that there are two types of permissions: - Table permissions which are a property of the table (think directory in file systems). These are set by the template (see earlier patch on table template). - Table entry permissions which are specific to a table entry (think a file in a directory). This patch describes those permissions. Furthermore in both cases the permissions are split into datapath vs control path. The template definition can set either one. For example, one could allow for adding table entries by the datapath in case of PNA add-on-miss is needed. By default tables entries have control plane RUD, meaning the control plane can Read, Update or Delete entries. By default, as well, the control plane can create new entries unless specified otherwise by the template. Lets see an example of which creates the table "cb/tname" at template time: tc p4template create table/aP4proggie/cb/tname tblid 1 keysz 64 \ permissions 0x3C24 ... Above is setting the table tname's permission to be 0x3C24 is equivalent to CRUD----R--X-- meaning: The control plane can Create, Read, Update, Delete The datapath can only Read and Execute table entries. If one was to dump this table with: tc -j p4template get table/aP4proggie/cb/tname | jq . The output would be the following: [ { "obj": "table", "pname": "aP4proggie", "pipeid": 22 }, { "templates": [ { "tblid": 1, "tname": "cb/tname", "keysz": 64, "max_entries": 256, "masks": 8, "entries": 0, "permissions": "CRUD----R--X--", "table_type": "exact", "acts_list": [] } ] } ] The expressed permissions above are probably the most practical for most use cases. __Constant Tables And P4-programmed Defined Entries__ If one wanted to restrict the table to be an equivalent to a "const" then the permissions would be set to be: -R------R--X-- In such a case, typically the P4 program will have some entries defined (see the famous P4 calculate example). The "initial entries" specified in the P4 program will have to be added by the template (as generated by the compiler), as such: tc p4template update table/aP4proggie/cb/tname \ entry srcAddr 10.10.10.10/24 dstAddr 1.1.1.0/24 prio 17 This table cannot be updated at runtime. Any attempt to add an entry of a table which is read-only at runtime will get a permission denied response back from the kernel. Note: If one was to create an equivalent for PNA add-on-miss feature for this table, then the template would issue table permissions as: -R-----CR--X-- PNA doesn't specify whether the datapath can also delete or update entries, but if it did then more appropriate permissions will be: -R-----CRUDX-- __Mix And Match of RW vs Constant Entries__ Lets look at other scenarios; lets say the table has CRUD----R--X-- permissions as defined by the template... At runtime the user could add entries which are "const" - by specifying the entry's permission as -R------R--X-- example: tc p4ctrl create aP4proggie/table/cb/tname srcAddr 10.10.10.10/24 \ dstAddr 1.1.1.0/24 prio 17 permissions 0x1024 action drop or not specify permissions at all as such: tc p4ctrl create aP4proggie/table/cb/tname srcAddr 10.10.10.10/24 \ dstAddr 1.1.1.0/24 prio 17 action drop in which case the table's permissions defined at template time(CRUD----R--X--) are assumed; meaning the table entry can be deleted or updated by the control plane. __Entries permissions Allowed On A Table Entry Creation At Runtime__ When an entry is added with expressed permissions it has at most to have what the template table definition expressed but could ask for less permission. For example, assuming a table with templated specified permissions of CR-D----R--X--: An entry created at runtime with permission of -R------R--X-- is allowed but an entry with -RUD----R--X-- will be rejected. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/net/p4tc.h | 124 +- include/uapi/linux/p4tc.h | 68 +- include/uapi/linux/rtnetlink.h | 9 + net/sched/p4tc/Makefile | 3 +- net/sched/p4tc/p4tc_runtime_api.c | 145 ++ net/sched/p4tc/p4tc_table.c | 54 +- net/sched/p4tc/p4tc_tbl_entry.c | 2572 +++++++++++++++++++++++++++++ net/sched/p4tc/p4tc_tmpl_api.c | 4 +- security/selinux/nlmsgtab.c | 6 +- 9 files changed, 2968 insertions(+), 17 deletions(-) create mode 100644 net/sched/p4tc/p4tc_runtime_api.c create mode 100644 net/sched/p4tc/p4tc_tbl_entry.c diff --git a/include/net/p4tc.h b/include/net/p4tc.h index b5e84594e..d600e8655 100644 --- a/include/net/p4tc.h +++ b/include/net/p4tc.h @@ -120,6 +120,11 @@ static inline bool p4tc_pipeline_get(struct p4tc_pipeline *pipeline) return refcount_inc_not_zero(&pipeline->p_ctrl_ref); } +static inline void p4tc_pipeline_put_ref(struct p4tc_pipeline *pipeline) +{ + refcount_dec(&pipeline->p_ctrl_ref); +} + void p4tc_pipeline_put(struct p4tc_pipeline *pipeline); struct p4tc_pipeline * p4tc_pipeline_find_byany_unsealed(struct net *net, const char *p_name, @@ -194,6 +199,8 @@ static inline int p4tc_action_destroy(struct tc_action **acts) #define P4TC_PERMISSIONS_UNINIT (1 << P4TC_PERM_MAX_BIT) +#define P4TC_MAX_PARAM_DATA_SIZE 124 + struct p4tc_table_defact { struct tc_action **default_acts; /* Will have two 7 bits blocks containing CRUDXPS (Create, read, update, @@ -215,8 +222,9 @@ struct p4tc_table { struct p4tc_template_common common; struct list_head tbl_acts_list; struct idr tbl_masks_idr; - struct idr tbl_prio_idr; + struct ida tbl_prio_idr; struct rhltable tbl_entries; + struct p4tc_table_entry *tbl_const_entry; struct p4tc_table_defact __rcu *tbl_default_hitact; struct p4tc_table_defact __rcu *tbl_default_missact; struct p4tc_table_perm __rcu *tbl_permissions; @@ -232,11 +240,14 @@ struct p4tc_table { u32 tbl_max_entries; u32 tbl_max_masks; u32 tbl_curr_num_masks; + /* Accounts for how many entries this table has */ + atomic_t tbl_nelems; /* Accounts for how many entities refer to this table. Usually just the * pipeline it belongs to. */ refcount_t tbl_ctrl_ref; u16 tbl_type; + u16 PAD0; }; extern const struct p4tc_template_ops p4tc_table_ops; @@ -301,6 +312,86 @@ struct p4tc_table_act { extern const struct p4tc_template_ops p4tc_act_ops; +extern const struct rhashtable_params entry_hlt_params; + +struct p4tc_table_entry; +struct p4tc_table_entry_work { + struct work_struct work; + struct p4tc_pipeline *pipeline; + struct p4tc_table_entry *entry; + struct p4tc_table *table; + u16 who_deleted; + bool send_event; +}; + +struct p4tc_table_entry_key { + u32 keysz; + /* Key start */ + u32 maskid; + unsigned char fa_key[] __aligned(8); +}; + +struct p4tc_table_entry_value { + u32 prio; + int num_acts; + struct tc_action **acts; + /* Accounts for how many entities are referencing, eg: Data path, + * one or more control path and timer. + */ + refcount_t entries_ref; + u32 permissions; + struct p4tc_table_entry_tm __rcu *tm; + struct p4tc_table_entry_work *entry_work; + u64 aging_ms; + struct hrtimer entry_timer; + bool is_dyn; +}; + +struct p4tc_table_entry_mask { + struct rcu_head rcu; + u32 sz; + u32 mask_index; + /* Accounts for how many entries are using this mask */ + refcount_t mask_ref; + u32 mask_id; + unsigned char fa_value[] __aligned(8); +}; + +struct p4tc_table_entry { + struct rcu_head rcu; + struct rhlist_head ht_node; + struct p4tc_table_entry_key key; + /* fallthrough: key data + value */ +}; + +#define P4TC_KEYSZ_BYTES(bits) (round_up(BITS_TO_BYTES(bits), 8)) + +#define P4TC_ENTRY_KEY_OFFSET (offsetof(struct p4tc_table_entry_key, fa_key)) + +#define P4TC_ENTRY_VALUE_OFFSET(entry) \ + (offsetof(struct p4tc_table_entry, key) + P4TC_ENTRY_KEY_OFFSET \ + + P4TC_KEYSZ_BYTES((entry)->key.keysz)) + +static inline void *p4tc_table_entry_value(struct p4tc_table_entry *entry) +{ + return entry->key.fa_key + P4TC_KEYSZ_BYTES(entry->key.keysz); +} + +static inline struct p4tc_table_entry_work * +p4tc_table_entry_work(struct p4tc_table_entry *entry) +{ + struct p4tc_table_entry_value *value = p4tc_table_entry_value(entry); + + return value->entry_work; +} + +extern const struct nla_policy p4tc_root_policy[P4TC_ROOT_MAX + 1]; +extern const struct nla_policy p4tc_policy[P4TC_MAX + 1]; + +struct p4tc_table_entry * +p4tc_table_entry_lookup_direct(struct p4tc_table *table, + struct p4tc_table_entry_key *key); + static inline int p4tc_action_init(struct net *net, struct nlattr *nla, struct tc_action *acts[], u32 pipeid, u32 flags, struct netlink_ext_ack *extack) @@ -390,6 +481,14 @@ p4tc_table_init_default_acts(struct net *net, struct list_head *acts_list, struct netlink_ext_ack *extack); +static inline void p4tc_table_defact_destroy(struct p4tc_table_defact *defact) +{ + if (defact) { + p4tc_action_destroy(defact->default_acts); + kfree(defact); + } +} + static inline void p4tc_table_defacts_acts_copy(struct p4tc_table_defact *defact_copy, struct p4tc_table_defact *defact_orig) @@ -404,15 +503,36 @@ p4tc_table_replace_default_acts(struct p4tc_table *table, struct p4tc_table_perm * p4tc_table_init_permissions(struct p4tc_table *table, u16 permissions, - struct netlink_ext_ack *extack); + struct netlink_ext_ack *extack); void p4tc_table_replace_permissions(struct p4tc_table *table, struct p4tc_table_perm *tbl_perm, bool lock_rtnl); +void p4tc_table_entry_destroy_hash(void *ptr, void *arg); + +struct p4tc_table_entry * +p4tc_table_const_entry_cu(struct net *net, struct nlattr *arg, + struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct netlink_ext_ack *extack); +int p4tc_tbl_entry_crud(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, int cmd, + struct netlink_ext_ack *extack); +int p4tc_tbl_entry_dumpit(struct net *net, struct sk_buff *skb, + struct netlink_callback *cb, + struct nlattr *arg, char *p_name); +int p4tc_tbl_entry_fill(struct sk_buff *skb, struct p4tc_table *table, + struct p4tc_table_entry *entry, u32 tbl_id, + u16 who_deleted); struct tcf_p4act * p4a_runt_prealloc_get_next(struct p4tc_act *act); void p4a_runt_init_flags(struct tcf_p4act *p4act); +static inline bool p4tc_runtime_msg_is_update(struct nlmsghdr *n) +{ + return n->nlmsg_type == RTM_P4TC_UPDATE; +} + #define to_pipeline(t) ((struct p4tc_pipeline *)t) #define p4tc_to_act(t) ((struct p4tc_act *)t) #define p4tc_to_table(t) ((struct p4tc_table *)t) diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h index 21f49de86..55fc660c9 100644 --- a/include/uapi/linux/p4tc.h +++ b/include/uapi/linux/p4tc.h @@ -88,6 +88,9 @@ enum { #define p4tc_ctrl_pub_ok(perm) ((perm) & P4TC_CTRL_PERM_P) #define p4tc_ctrl_sub_ok(perm) ((perm) & P4TC_CTRL_PERM_S) +#define p4tc_ctrl_perm_rm_create(perm) \ + (((perm) & ~P4TC_CTRL_PERM_C)) + #define p4tc_data_create_ok(perm) ((perm) & P4TC_DATA_PERM_C) #define p4tc_data_read_ok(perm) ((perm) & P4TC_DATA_PERM_R) #define p4tc_data_update_ok(perm) ((perm) & P4TC_DATA_PERM_U) @@ -96,6 +99,9 @@ enum { #define p4tc_data_pub_ok(perm) ((perm) & P4TC_DATA_PERM_P) #define p4tc_data_sub_ok(perm) ((perm) & P4TC_DATA_PERM_S) +#define p4tc_data_perm_rm_create(perm) \ + (((perm) & ~P4TC_DATA_PERM_C)) + struct p4tc_table_parm { __u64 tbl_aging; __u32 tbl_keysz; @@ -129,6 +135,15 @@ enum { #define P4TC_OBJ_MAX (__P4TC_OBJ_MAX - 1) +/* P4 runtime Object types */ +enum { + P4TC_OBJ_RUNTIME_UNSPEC, + P4TC_OBJ_RUNTIME_TABLE, + __P4TC_OBJ_RUNTIME_MAX, +}; + +#define P4TC_OBJ_RUNTIME_MAX (__P4TC_OBJ_RUNTIME_MAX - 1) + /* P4 attributes */ enum { P4TC_UNSPEC, @@ -216,7 +231,7 @@ enum { P4TC_TABLE_INFO, /* struct p4tc_table_parm */ P4TC_TABLE_DEFAULT_HIT, /* nested default hit action attributes */ P4TC_TABLE_DEFAULT_MISS, /* nested default miss action attributes */ - P4TC_TABLE_CONST_ENTRY, /* nested const table entry */ + P4TC_TABLE_CONST_ENTRY, /* nested const table entry*/ P4TC_TABLE_ACTS_LIST, /* nested table actions list */ __P4TC_TABLE_MAX }; @@ -269,6 +284,57 @@ enum { #define P4TC_ACT_PARAMS_MAX (__P4TC_ACT_PARAMS_MAX - 1) +struct p4tc_table_entry_tm { + __u64 created; + __u64 lastused; + __u64 firstused; + __u16 who_created; + __u16 who_updated; + __u16 who_deleted; + __u16 permissions; +}; + +enum { + P4TC_ENTRY_TBL_ATTRS_UNSPEC, + P4TC_ENTRY_TBL_ATTRS_DEFAULT_HIT, /* nested default hit attrs */ + P4TC_ENTRY_TBL_ATTRS_DEFAULT_MISS, /* nested default miss attrs */ + P4TC_ENTRY_TBL_ATTRS_PERMISSIONS, /* u16 table permissions */ + __P4TC_ENTRY_TBL_ATTRS, +}; + +#define P4TC_ENTRY_TBL_ATTRS_MAX (__P4TC_ENTRY_TBL_ATTRS - 1) + +/* Table entry attributes */ +enum { + P4TC_ENTRY_UNSPEC, + P4TC_ENTRY_TBLNAME, /* string */ + P4TC_ENTRY_KEY_BLOB, /* Key blob */ + P4TC_ENTRY_MASK_BLOB, /* Mask blob */ + P4TC_ENTRY_PRIO, /* u32 */ + P4TC_ENTRY_ACT, /* nested actions */ + P4TC_ENTRY_TM, /* entry data path timestamps */ + P4TC_ENTRY_WHODUNNIT, /* tells who's modifying the entry */ + P4TC_ENTRY_CREATE_WHODUNNIT, /* tells who created the entry */ + P4TC_ENTRY_UPDATE_WHODUNNIT, /* tells who updated the entry last */ + P4TC_ENTRY_DELETE_WHODUNNIT, /* tells who deleted the entry */ + P4TC_ENTRY_PERMISSIONS, /* entry CRUDXPS permissions */ + P4TC_ENTRY_TBL_ATTRS, /* nested table attributes */ + P4TC_ENTRY_DYNAMIC, /* u8 tells if table entry is dynamic */ + P4TC_ENTRY_AGING, /* u64 table entry aging */ + P4TC_ENTRY_PAD, + __P4TC_ENTRY_MAX +}; + +#define P4TC_ENTRY_MAX (__P4TC_ENTRY_MAX - 1) + +enum { + P4TC_ENTITY_UNSPEC, + P4TC_ENTITY_KERNEL, + P4TC_ENTITY_TC, + P4TC_ENTITY_TIMER, + P4TC_ENTITY_MAX +}; + #define P4TC_RTA(r) \ ((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct p4tcmsg)))) diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h index 4f9ebe3e7..76645560b 100644 --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -203,6 +203,15 @@ enum { RTM_UPDATEP4TEMPLATE, #define RTM_UPDATEP4TEMPLATE RTM_UPDATEP4TEMPLATE + RTM_P4TC_CREATE = 128, +#define RTM_P4TC_CREATE RTM_P4TC_CREATE + RTM_P4TC_DEL, +#define RTM_P4TC_DEL RTM_P4TC_DEL + RTM_P4TC_GET, +#define RTM_P4TC_GET RTM_P4TC_GET + RTM_P4TC_UPDATE, +#define RTM_P4TC_UPDATE RTM_P4TC_UPDATE + __RTM_MAX, #define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1) }; diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index 7a9c13f86..921909ac4 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o \ - p4tc_action.o p4tc_table.o + p4tc_action.o p4tc_table.o p4tc_tbl_entry.o \ + p4tc_runtime_api.o diff --git a/net/sched/p4tc/p4tc_runtime_api.c b/net/sched/p4tc/p4tc_runtime_api.c new file mode 100644 index 000000000..fe9d9703c --- /dev/null +++ b/net/sched/p4tc/p4tc_runtime_api.c @@ -0,0 +1,145 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_runtime_api.c P4 TC RUNTIME API + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int tc_ctl_p4_root(struct sk_buff *skb, struct nlmsghdr *n, int cmd, + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + + switch (t->obj) { + case P4TC_OBJ_RUNTIME_TABLE: { + struct net *net = sock_net(skb->sk); + int ret; + + net = maybe_get_net(net); + if (!net) { + NL_SET_ERR_MSG(extack, "Net namespace is going down"); + return -EBUSY; + } + + ret = p4tc_tbl_entry_crud(net, skb, n, cmd, extack); + + put_net(net); + + return ret; + } + default: + NL_SET_ERR_MSG(extack, "Unknown P4 runtime object type"); + return -EOPNOTSUPP; + } +} + +static int tc_ctl_p4_get(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + return tc_ctl_p4_root(skb, n, RTM_P4TC_GET, extack); +} + +static int tc_ctl_p4_delete(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + return tc_ctl_p4_root(skb, n, RTM_P4TC_DEL, extack); +} + +static int tc_ctl_p4_cu(struct sk_buff *skb, struct nlmsghdr *n, + struct netlink_ext_ack *extack) +{ + int ret; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = tc_ctl_p4_root(skb, n, n->nlmsg_type, extack); + + return ret; +} + +static int tc_ctl_p4_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + struct p4tcmsg *t; + int ret = 0; + + /* Dump is always called with the nlk->cb_mutex held. + * In rtnl this mutex is set to rtnl_lock, which makes dump, + * even for table entries, to serialized over the rtnl_lock. + * + * For table entries, it guarantees the net namespace is alive. + * For externs, we don't need to lock the rtnl_lock. + */ + ASSERT_RTNL(); + + ret = nlmsg_parse(cb->nlh, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, cb->extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(cb->extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(cb->extack, + "Netlink P4TC Runtime attributes missing"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + t = nlmsg_data(cb->nlh); + + switch (t->obj) { + case P4TC_OBJ_RUNTIME_TABLE: + return p4tc_tbl_entry_dumpit(sock_net(skb->sk), skb, cb, + tb[P4TC_ROOT], p_name); + default: + NL_SET_ERR_MSG_FMT(cb->extack, + "Unknown p4 runtime object type %u\n", + t->obj); + return -ENOENT; + } +} + +static int __init p4tc_tbl_init(void) +{ + rtnl_register(PF_UNSPEC, RTM_P4TC_CREATE, tc_ctl_p4_cu, NULL, + RTNL_FLAG_DOIT_UNLOCKED); + rtnl_register(PF_UNSPEC, RTM_P4TC_UPDATE, tc_ctl_p4_cu, NULL, + RTNL_FLAG_DOIT_UNLOCKED); + rtnl_register(PF_UNSPEC, RTM_P4TC_DEL, tc_ctl_p4_delete, NULL, + RTNL_FLAG_DOIT_UNLOCKED); + rtnl_register(PF_UNSPEC, RTM_P4TC_GET, tc_ctl_p4_get, tc_ctl_p4_dump, + RTNL_FLAG_DOIT_UNLOCKED); + + return 0; +} + +subsys_initcall(p4tc_tbl_init); diff --git a/net/sched/p4tc/p4tc_table.c b/net/sched/p4tc/p4tc_table.c index ac6c28e2d..df3fd3eef 100644 --- a/net/sched/p4tc/p4tc_table.c +++ b/net/sched/p4tc/p4tc_table.c @@ -144,6 +144,7 @@ static int _p4tc_table_fill_nlmsg(struct sk_buff *skb, struct p4tc_table *table) parm.tbl_max_masks = table->tbl_max_masks; parm.tbl_type = table->tbl_type; parm.tbl_aging = table->tbl_aging; + parm.tbl_num_entries = atomic_read(&table->tbl_nelems); tbl_perm = rcu_dereference_rtnl(table->tbl_permissions); parm.tbl_permissions = tbl_perm->permissions; @@ -217,6 +218,16 @@ static int _p4tc_table_fill_nlmsg(struct sk_buff *skb, struct p4tc_table *table) } nla_nest_end(skb, nested_tbl_acts); + if (table->tbl_const_entry) { + struct nlattr *const_nest; + + const_nest = nla_nest_start(skb, P4TC_TABLE_CONST_ENTRY); + p4tc_tbl_entry_fill(skb, table, table->tbl_const_entry, + table->tbl_id, P4TC_ENTITY_UNSPEC); + nla_nest_end(skb, const_nest); + } + table->tbl_const_entry = NULL; + if (nla_put(skb, P4TC_TABLE_INFO, sizeof(parm), &parm)) goto out_nlmsg_trim; nla_nest_end(skb, nest); @@ -243,14 +254,6 @@ static int p4tc_table_fill_nlmsg(struct net *net, struct sk_buff *skb, return 0; } -static inline void p4tc_table_defact_destroy(struct p4tc_table_defact *defact) -{ - if (defact) { - p4tc_action_destroy(defact->default_acts); - kfree(defact); - } -} - static void p4tc_table_acts_list_destroy(struct list_head *acts_list) { struct p4tc_table_act *table_act, *tmp; @@ -375,8 +378,11 @@ static int _p4tc_table_put(struct net *net, struct nlattr **tb, p4tc_table_acts_list_destroy(&table->tbl_acts_list); + rhltable_free_and_destroy(&table->tbl_entries, + p4tc_table_entry_destroy_hash, table); + idr_destroy(&table->tbl_masks_idr); - idr_destroy(&table->tbl_prio_idr); + ida_destroy(&table->tbl_prio_idr); perm = rcu_replace_pointer_rtnl(table->tbl_permissions, NULL); kfree_rcu(perm, rcu); @@ -900,6 +906,7 @@ static struct p4tc_table *p4tc_table_create(struct net *net, struct nlattr **tb, struct p4tc_pipeline *pipeline, struct netlink_ext_ack *extack) { + struct rhashtable_params table_hlt_params = entry_hlt_params; struct p4tc_table_default_act_params def_params = {0}; struct p4tc_table_perm *tbl_init_perms = NULL; struct p4tc_table_parm *parm; @@ -1122,12 +1129,24 @@ static struct p4tc_table *p4tc_table_create(struct net *net, struct nlattr **tb, } idr_init(&table->tbl_masks_idr); - idr_init(&table->tbl_prio_idr); + ida_init(&table->tbl_prio_idr); spin_lock_init(&table->tbl_masks_idr_lock); + table_hlt_params.max_size = table->tbl_max_entries; + if (table->tbl_max_entries > U16_MAX) + table_hlt_params.nelem_hint = U16_MAX / 4 * 3; + else + table_hlt_params.nelem_hint = table->tbl_max_entries / 4 * 3; + + if (rhltable_init(&table->tbl_entries, &table_hlt_params) < 0) { + ret = -EINVAL; + goto defaultacts_destroy; + } + pipeline->curr_tables += 1; table->common.ops = (struct p4tc_template_ops *)&p4tc_table_ops; + atomic_set(&table->tbl_nelems, 0); return table; @@ -1284,6 +1303,21 @@ static struct p4tc_table *p4tc_table_update(struct net *net, struct nlattr **tb, } } + if (tb[P4TC_TABLE_CONST_ENTRY]) { + struct p4tc_table_entry *entry; + + /* Workaround to make this work */ + entry = p4tc_table_const_entry_cu(net, + tb[P4TC_TABLE_CONST_ENTRY], + pipeline, table, extack); + if (IS_ERR(entry)) { + ret = PTR_ERR(entry); + goto free_perm; + } + + table->tbl_const_entry = entry; + } + p4tc_table_replace_default_acts(table, &def_params, false); p4tc_table_replace_permissions(table, perm, false); diff --git a/net/sched/p4tc/p4tc_tbl_entry.c b/net/sched/p4tc/p4tc_tbl_entry.c new file mode 100644 index 000000000..ee1ecdf71 --- /dev/null +++ b/net/sched/p4tc/p4tc_tbl_entry.c @@ -0,0 +1,2572 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/p4tc/p4tc_tbl_entry.c P4 TC TABLE ENTRY + * + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SIZEOF_MASKID (sizeof(((struct p4tc_table_entry_key *)0)->maskid)) + +#define STARTOF_KEY(key) (&((key)->maskid)) + +/* In this code we avoid locks for create/updating/deleting table entries by + * using a refcount (entries_ref). We also use RCU to avoid locks for reading. + * Everytime we try to get the entry, we increment and check the refcount to see + * whether a delete is happening in parallel. + */ + +static int p4tc_tbl_entry_get(struct p4tc_table_entry_value *value) +{ + return refcount_inc_not_zero(&value->entries_ref); +} + +static bool p4tc_tbl_entry_put(struct p4tc_table_entry_value *value) +{ + return refcount_dec_if_one(&value->entries_ref); +} + +static bool p4tc_tbl_entry_put_ref(struct p4tc_table_entry_value *value) +{ + return refcount_dec_not_one(&value->entries_ref); +} + +static u32 p4tc_entry_hash_fn(const void *data, u32 len, u32 seed) +{ + const struct p4tc_table_entry_key *key = data; + u32 keysz; + + /* The key memory area is always zero allocated aligned to 8 */ + keysz = round_up(SIZEOF_MASKID + (key->keysz >> 3), 4); + + return jhash2(STARTOF_KEY(key), keysz / sizeof(u32), seed); +} + +static int p4tc_entry_hash_cmp(struct rhashtable_compare_arg *arg, + const void *ptr) +{ + const struct p4tc_table_entry_key *key = arg->key; + const struct p4tc_table_entry *entry = ptr; + u32 keysz; + + keysz = SIZEOF_MASKID + (entry->key.keysz >> 3); + + return memcmp(STARTOF_KEY(&entry->key), STARTOF_KEY(key), keysz); +} + +static u32 p4tc_entry_obj_hash_fn(const void *data, u32 len, u32 seed) +{ + const struct p4tc_table_entry *entry = data; + + return p4tc_entry_hash_fn(&entry->key, len, seed); +} + +const struct rhashtable_params entry_hlt_params = { + .obj_cmpfn = p4tc_entry_hash_cmp, + .obj_hashfn = p4tc_entry_obj_hash_fn, + .hashfn = p4tc_entry_hash_fn, + .head_offset = offsetof(struct p4tc_table_entry, ht_node), + .key_offset = offsetof(struct p4tc_table_entry, key), + .automatic_shrinking = true, +}; + +static struct rhlist_head * +p4tc_entry_lookup_bucket(struct p4tc_table *table, + struct p4tc_table_entry_key *key) +{ + return rhltable_lookup(&table->tbl_entries, key, entry_hlt_params); +} + +static struct p4tc_table_entry * +__p4tc_entry_lookup_fast(struct p4tc_table *table, + struct p4tc_table_entry_key *key) + __must_hold(RCU) +{ + struct p4tc_table_entry *entry_curr; + struct rhlist_head *bucket_list; + + bucket_list = + p4tc_entry_lookup_bucket(table, key); + if (!bucket_list) + return NULL; + + rht_entry(entry_curr, bucket_list, ht_node); + + return entry_curr; +} + +static struct p4tc_table_entry * +p4tc_entry_lookup(struct p4tc_table *table, struct p4tc_table_entry_key *key, + u32 prio) __must_hold(RCU) +{ + struct rhlist_head *tmp, *bucket_list; + struct p4tc_table_entry *entry; + + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) + return __p4tc_entry_lookup_fast(table, key); + + bucket_list = + p4tc_entry_lookup_bucket(table, key); + if (!bucket_list) + return NULL; + + rhl_for_each_entry_rcu(entry, tmp, bucket_list, ht_node) { + struct p4tc_table_entry_value *value = + p4tc_table_entry_value(entry); + + if (value->prio == prio) + return entry; + } + + return NULL; +} + +static struct p4tc_table_entry * +__p4tc_entry_lookup(struct p4tc_table *table, struct p4tc_table_entry_key *key) + __must_hold(RCU) +{ + struct p4tc_table_entry *entry = NULL; + struct rhlist_head *tmp, *bucket_list; + struct p4tc_table_entry *entry_curr; + u32 smallest_prio = U32_MAX; + + bucket_list = + rhltable_lookup(&table->tbl_entries, key, entry_hlt_params); + if (!bucket_list) + return NULL; + + rhl_for_each_entry_rcu(entry_curr, tmp, bucket_list, ht_node) { + struct p4tc_table_entry_value *value = + p4tc_table_entry_value(entry_curr); + if (value->prio <= smallest_prio) { + smallest_prio = value->prio; + entry = entry_curr; + } + } + + return entry; +} + +static void mask_key(const struct p4tc_table_entry_mask *mask, u8 *masked_key, + u8 *skb_key) +{ + int i; + + for (i = 0; i < BITS_TO_BYTES(mask->sz); i++) + masked_key[i] = skb_key[i] & mask->fa_value[i]; +} + +static void update_last_used(struct p4tc_table_entry *entry) +{ + struct p4tc_table_entry_tm *entry_tm; + struct p4tc_table_entry_value *value; + + value = p4tc_table_entry_value(entry); + entry_tm = rcu_dereference(value->tm); + WRITE_ONCE(entry_tm->lastused, get_jiffies_64()); + + if (value->is_dyn && !hrtimer_active(&value->entry_timer)) + hrtimer_start(&value->entry_timer, ms_to_ktime(1000), + HRTIMER_MODE_REL); +} + +static struct p4tc_table_entry * +__p4tc_table_entry_lookup_direct(struct p4tc_table *table, + struct p4tc_table_entry_key *key) +{ + struct p4tc_table_entry *entry = NULL; + u32 smallest_prio = U32_MAX; + int i; + + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) + return __p4tc_entry_lookup_fast(table, key); + + for (i = 0; i < table->tbl_curr_num_masks; i++) { + u8 __mkey[sizeof(*key) + BITS_TO_BYTES(P4TC_MAX_KEYSZ)]; + struct p4tc_table_entry_key *mkey = (void *)&__mkey; + struct p4tc_table_entry_mask *mask = + rcu_dereference(table->tbl_masks_array[i]); + struct p4tc_table_entry *entry_curr = NULL; + + mkey->keysz = key->keysz; + mkey->maskid = mask->mask_id; + mask_key(mask, mkey->fa_key, key->fa_key); + + if (table->tbl_type == P4TC_TABLE_TYPE_LPM) { + entry_curr = __p4tc_entry_lookup_fast(table, mkey); + if (entry_curr) + return entry_curr; + } else { + entry_curr = __p4tc_entry_lookup(table, mkey); + + if (entry_curr) { + struct p4tc_table_entry_value *value = + p4tc_table_entry_value(entry_curr); + if (value->prio <= smallest_prio) { + smallest_prio = value->prio; + entry = entry_curr; + } + } + } + } + + return entry; +} + +struct p4tc_table_entry * +p4tc_table_entry_lookup_direct(struct p4tc_table *table, + struct p4tc_table_entry_key *key) +{ + struct p4tc_table_entry *entry; + + entry = __p4tc_table_entry_lookup_direct(table, key); + + if (entry) + update_last_used(entry); + + return entry; +} + +#define p4tc_table_entry_mask_find_byid(table, id) \ + (idr_find(&(table)->tbl_masks_idr, id)) + +static void gen_exact_mask(u8 *mask, u32 mask_size) +{ + memset(mask, 0xFF, mask_size); +} + +static int p4tca_table_get_entry_keys(struct sk_buff *skb, + struct p4tc_table *table, + struct p4tc_table_entry *entry) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_table_entry_mask *mask; + int ret = -ENOMEM; + u32 key_sz_bytes; + + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) { + u8 mask_value[BITS_TO_BYTES(P4TC_MAX_KEYSZ)] = { 0 }; + + key_sz_bytes = BITS_TO_BYTES(entry->key.keysz); + if (nla_put(skb, P4TC_ENTRY_KEY_BLOB, key_sz_bytes, + entry->key.fa_key)) + goto out_nlmsg_trim; + + gen_exact_mask(mask_value, key_sz_bytes); + if (nla_put(skb, P4TC_ENTRY_MASK_BLOB, key_sz_bytes, mask_value)) + goto out_nlmsg_trim; + } else { + key_sz_bytes = BITS_TO_BYTES(entry->key.keysz); + if (nla_put(skb, P4TC_ENTRY_KEY_BLOB, key_sz_bytes, + entry->key.fa_key)) + goto out_nlmsg_trim; + + mask = p4tc_table_entry_mask_find_byid(table, + entry->key.maskid); + if (nla_put(skb, P4TC_ENTRY_MASK_BLOB, key_sz_bytes, + mask->fa_value)) + goto out_nlmsg_trim; + } + + return 0; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static void p4tc_table_entry_tm_dump(struct p4tc_table_entry_tm *dtm, + struct p4tc_table_entry_tm *stm) +{ + unsigned long now = jiffies; + u64 last_used; + + dtm->created = stm->created ? + jiffies_to_clock_t(now - stm->created) : 0; + + last_used = READ_ONCE(stm->lastused); + dtm->lastused = stm->lastused ? + jiffies_to_clock_t(now - last_used) : 0; + dtm->firstused = stm->firstused ? + jiffies_to_clock_t(now - stm->firstused) : 0; +} + +#define P4TC_ENTRY_MAX_IDS (P4TC_PATH_MAX - 1) + +int p4tc_tbl_entry_fill(struct sk_buff *skb, struct p4tc_table *table, + struct p4tc_table_entry *entry, u32 tbl_id, + u16 who_deleted) +{ + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_table_entry_value *value; + struct p4tc_table_entry_tm dtm, *tm; + struct nlattr *nest, *nest_acts; + u32 ids[P4TC_ENTRY_MAX_IDS]; + int ret = -ENOMEM; + + ids[P4TC_TBLID_IDX - 1] = tbl_id; + + if (nla_put(skb, P4TC_PATH, P4TC_ENTRY_MAX_IDS * sizeof(u32), ids)) + goto out_nlmsg_trim; + + nest = nla_nest_start(skb, P4TC_PARAMS); + if (!nest) + goto out_nlmsg_trim; + + value = p4tc_table_entry_value(entry); + + if (nla_put_u32(skb, P4TC_ENTRY_PRIO, value->prio)) + goto out_nlmsg_trim; + + if (p4tca_table_get_entry_keys(skb, table, entry) < 0) + goto out_nlmsg_trim; + + if (value->acts) { + nest_acts = nla_nest_start(skb, P4TC_ENTRY_ACT); + if (tcf_action_dump(skb, value->acts, 0, 0, false) < 0) + goto out_nlmsg_trim; + nla_nest_end(skb, nest_acts); + } + + if (nla_put_u16(skb, P4TC_ENTRY_PERMISSIONS, value->permissions)) + goto out_nlmsg_trim; + + tm = rcu_dereference_protected(value->tm, 1); + + if (nla_put_u8(skb, P4TC_ENTRY_CREATE_WHODUNNIT, tm->who_created)) + goto out_nlmsg_trim; + + if (tm->who_updated) { + if (nla_put_u8(skb, P4TC_ENTRY_UPDATE_WHODUNNIT, + tm->who_updated)) + goto out_nlmsg_trim; + } + + if (who_deleted) { + if (nla_put_u8(skb, P4TC_ENTRY_DELETE_WHODUNNIT, + who_deleted)) + goto out_nlmsg_trim; + } + + p4tc_table_entry_tm_dump(&dtm, tm); + if (nla_put_64bit(skb, P4TC_ENTRY_TM, sizeof(dtm), &dtm, + P4TC_ENTRY_PAD)) + goto out_nlmsg_trim; + + if (value->is_dyn) { + if (nla_put_u8(skb, P4TC_ENTRY_DYNAMIC, 1)) + goto out_nlmsg_trim; + } + + if (value->aging_ms) { + if (nla_put_u64_64bit(skb, P4TC_ENTRY_AGING, value->aging_ms, + P4TC_ENTRY_PAD)) + goto out_nlmsg_trim; + } + + nla_nest_end(skb, nest); + + return skb->len; + +out_nlmsg_trim: + nlmsg_trim(skb, b); + return ret; +} + +static struct netlink_range_validation range_aging = { + .min = 1, + .max = P4TC_MAX_T_AGING_MS, +}; + +static const struct nla_policy p4tc_entry_policy[P4TC_ENTRY_MAX + 1] = { + [P4TC_ENTRY_TBLNAME] = { .type = NLA_STRING }, + [P4TC_ENTRY_KEY_BLOB] = { .type = NLA_BINARY }, + [P4TC_ENTRY_MASK_BLOB] = { .type = NLA_BINARY }, + [P4TC_ENTRY_PRIO] = { .type = NLA_U32 }, + [P4TC_ENTRY_ACT] = { .type = NLA_NESTED }, + [P4TC_ENTRY_TM] = + NLA_POLICY_EXACT_LEN(sizeof(struct p4tc_table_entry_tm)), + [P4TC_ENTRY_WHODUNNIT] = { .type = NLA_U8 }, + [P4TC_ENTRY_CREATE_WHODUNNIT] = { .type = NLA_U8 }, + [P4TC_ENTRY_UPDATE_WHODUNNIT] = { .type = NLA_U8 }, + [P4TC_ENTRY_DELETE_WHODUNNIT] = { .type = NLA_U8 }, + [P4TC_ENTRY_PERMISSIONS] = NLA_POLICY_MAX(NLA_U16, P4TC_MAX_PERMISSION), + [P4TC_ENTRY_TBL_ATTRS] = { .type = NLA_NESTED }, + [P4TC_ENTRY_DYNAMIC] = NLA_POLICY_RANGE(NLA_U8, 1, 1), + [P4TC_ENTRY_AGING] = NLA_POLICY_FULL_RANGE(NLA_U64, &range_aging), +}; + +static struct p4tc_table_entry_mask * +p4tc_table_entry_mask_find_byvalue(struct p4tc_table *table, + struct p4tc_table_entry_mask *mask) +{ + struct p4tc_table_entry_mask *mask_cur; + unsigned long mask_id, tmp; + + idr_for_each_entry_ul(&table->tbl_masks_idr, mask_cur, tmp, mask_id) { + if (mask_cur->sz == mask->sz) { + u32 mask_sz_bytes = BITS_TO_BYTES(mask->sz); + void *curr_mask_value = mask_cur->fa_value; + void *mask_value = mask->fa_value; + + if (memcmp(curr_mask_value, mask_value, mask_sz_bytes) == 0) + return mask_cur; + } + } + + return NULL; +} + +static void __p4tc_table_entry_mask_del(struct p4tc_table *table, + struct p4tc_table_entry_mask *mask) +{ + if (table->tbl_type == P4TC_TABLE_TYPE_TERNARY) { + struct p4tc_table_entry_mask __rcu **masks_array; + unsigned long *free_masks_bitmap; + + masks_array = table->tbl_masks_array; + rcu_assign_pointer(masks_array[mask->mask_index], NULL); + + free_masks_bitmap = + rcu_dereference_protected(table->tbl_free_masks_bitmap, + 1); + bitmap_set(free_masks_bitmap, mask->mask_index, 1); + } else if (table->tbl_type == P4TC_TABLE_TYPE_LPM) { + struct p4tc_table_entry_mask __rcu **masks_array; + int i; + + masks_array = table->tbl_masks_array; + + for (i = mask->mask_index; i < table->tbl_curr_num_masks - 1; + i++) { + struct p4tc_table_entry_mask *mask_tmp; + + mask_tmp = rcu_dereference_protected(masks_array[i + 1], + 1); + rcu_assign_pointer(masks_array[i + 1], mask_tmp); + } + + rcu_assign_pointer(masks_array[table->tbl_curr_num_masks - 1], + NULL); + } + + table->tbl_curr_num_masks--; +} + +static void p4tc_table_entry_mask_del(struct p4tc_table *table, + struct p4tc_table_entry *entry) +{ + struct p4tc_table_entry_mask *mask_found; + const u32 mask_id = entry->key.maskid; + + /* Will always be found */ + mask_found = p4tc_table_entry_mask_find_byid(table, mask_id); + + /* Last reference, can delete */ + if (refcount_dec_if_one(&mask_found->mask_ref)) { + spin_lock_bh(&table->tbl_masks_idr_lock); + idr_remove(&table->tbl_masks_idr, mask_found->mask_id); + __p4tc_table_entry_mask_del(table, mask_found); + spin_unlock_bh(&table->tbl_masks_idr_lock); + kfree_rcu(mask_found, rcu); + } else { + if (!refcount_dec_not_one(&mask_found->mask_ref)) + pr_warn("Mask was deleted in parallel"); + } +} + +#if defined(__LITTLE_ENDIAN_BITFIELD) +static u32 p4tc_fls(u8 *ptr, size_t len) +{ + int i; + + for (i = len - 1; i >= 0; i--) { + int pos = fls(ptr[i]); + + if (pos) + return (i * 8) + pos; + } + + return 0; +} +#else +static u32 p4tc_ffs(u8 *ptr, size_t len) +{ + int i; + + for (i = 0; i < len; i++) { + int pos = ffs(ptr[i]); + + if (pos) + return (i * 8) + pos; + } + + return 0; +} +#endif + +static u32 find_lpm_mask(struct p4tc_table *table, u8 *ptr) +{ + u32 ret; +#if defined(__LITTLE_ENDIAN_BITFIELD) + ret = p4tc_fls(ptr, BITS_TO_BYTES(table->tbl_keysz)); +#else + ret = p4tc_ffs(ptr, BITS_TO_BYTES(table->tbl_keysz)); +#endif + return ret ?: table->tbl_keysz; +} + +static int p4tc_table_lpm_mask_insert(struct p4tc_table *table, + struct p4tc_table_entry_mask *mask) +{ + struct p4tc_table_entry_mask __rcu **masks_array = + table->tbl_masks_array; + const u32 nmasks = table->tbl_curr_num_masks ?: 1; + int pos; + + for (pos = 0; pos < nmasks; pos++) { + u32 mask_value = find_lpm_mask(table, mask->fa_value); + + if (table->tbl_masks_array[pos]) { + struct p4tc_table_entry_mask *mask_pos; + u32 array_mask_value; + + mask_pos = rcu_dereference_protected(masks_array[pos], + 1); + array_mask_value = + find_lpm_mask(table, mask_pos->fa_value); + + if (mask_value > array_mask_value) { + /* shift masks to the right (will keep invariant) */ + u32 tail = nmasks; + + while (tail > pos + 1) { + rcu_assign_pointer(masks_array[tail], + masks_array[tail - 1]); + table->tbl_masks_array[tail] = + table->tbl_masks_array[tail - 1]; + tail--; + } + rcu_assign_pointer(masks_array[pos + 1], + masks_array[pos]); + /* assign to pos */ + break; + } + } else { + /* pos is empty, assign to pos */ + break; + } + } + + mask->mask_index = pos; + rcu_assign_pointer(masks_array[pos], mask); + table->tbl_curr_num_masks++; + + return 0; +} + +static int +p4tc_table_ternary_mask_insert(struct p4tc_table *table, + struct p4tc_table_entry_mask *mask) +{ + unsigned long *free_masks_bitmap = + rcu_dereference_protected(table->tbl_free_masks_bitmap, 1); + unsigned long pos = + find_first_bit(free_masks_bitmap, P4TC_MAX_TMASKS); + struct p4tc_table_entry_mask __rcu **masks_array = + table->tbl_masks_array; + + if (pos == P4TC_MAX_TMASKS) + return -ENOSPC; + + mask->mask_index = pos; + rcu_assign_pointer(masks_array[pos], mask); + bitmap_clear(free_masks_bitmap, pos, 1); + table->tbl_curr_num_masks++; + + return 0; +} + +static int p4tc_table_add_mask_array(struct p4tc_table *table, + struct p4tc_table_entry_mask *mask) +{ + if (table->tbl_max_masks < table->tbl_curr_num_masks + 1) + return -ENOSPC; + + switch (table->tbl_type) { + case P4TC_TABLE_TYPE_TERNARY: + return p4tc_table_ternary_mask_insert(table, mask); + case P4TC_TABLE_TYPE_LPM: + return p4tc_table_lpm_mask_insert(table, mask); + default: + return -ENOSPC; + } +} + +/* TODO: Ordering optimisation for LPM */ +static struct p4tc_table_entry_mask * +p4tc_table_entry_mask_add(struct p4tc_table *table, + struct p4tc_table_entry *entry, + struct p4tc_table_entry_mask *mask) +{ + struct p4tc_table_entry_mask *mask_found; + int ret; + + mask_found = p4tc_table_entry_mask_find_byvalue(table, mask); + /* Only add mask if it was not already added */ + if (!mask_found) { + struct p4tc_table_entry_mask *nmask; + size_t mask_sz_bytes = BITS_TO_BYTES(mask->sz); + + nmask = kzalloc(struct_size(mask_found, fa_value, mask_sz_bytes), GFP_ATOMIC); + if (unlikely(!nmask)) + return ERR_PTR(-ENOMEM); + + memcpy(nmask->fa_value, mask->fa_value, mask_sz_bytes); + + nmask->mask_id = 1; + nmask->sz = mask->sz; + refcount_set(&nmask->mask_ref, 1); + + spin_lock_bh(&table->tbl_masks_idr_lock); + ret = idr_alloc_u32(&table->tbl_masks_idr, nmask, + &nmask->mask_id, UINT_MAX, GFP_ATOMIC); + if (ret < 0) + goto unlock; + + ret = p4tc_table_add_mask_array(table, nmask); +unlock: + spin_unlock_bh(&table->tbl_masks_idr_lock); + if (ret < 0) { + kfree(nmask); + return ERR_PTR(ret); + } + entry->key.maskid = nmask->mask_id; + mask_found = nmask; + } else { + if (!refcount_inc_not_zero(&mask_found->mask_ref)) + return ERR_PTR(-EBUSY); + entry->key.maskid = mask_found->mask_id; + } + + return mask_found; +} + +static int p4tc_tbl_entry_emit_event(struct p4tc_table_entry_work *entry_work, + int cmd, gfp_t alloc_flags) +{ + struct p4tc_pipeline *pipeline = entry_work->pipeline; + struct p4tc_table_entry *entry = entry_work->entry; + struct p4tc_table *table = entry_work->table; + u16 who_deleted = entry_work->who_deleted; + struct net *net = pipeline->net; + struct sock *rtnl = net->rtnl; + struct nlmsghdr *nlh; + struct nlattr *nest; + struct sk_buff *skb; + struct nlattr *root; + struct p4tcmsg *t; + int err = -ENOMEM; + + if (!rtnl_has_listeners(net, RTNLGRP_TC)) + return 0; + + skb = alloc_skb(NLMSG_GOODSIZE, alloc_flags); + if (!skb) + return err; + + nlh = nlmsg_put(skb, 1, 1, cmd, sizeof(*t), NLM_F_REQUEST); + if (!nlh) + goto free_skb; + + t = nlmsg_data(nlh); + if (!t) + goto free_skb; + + t->pipeid = pipeline->common.p_id; + t->obj = P4TC_OBJ_RUNTIME_TABLE; + + if (nla_put_string(skb, P4TC_ROOT_PNAME, pipeline->common.name)) + goto free_skb; + + root = nla_nest_start(skb, P4TC_ROOT); + if (!root) + goto free_skb; + + nest = nla_nest_start(skb, 1); + if (p4tc_tbl_entry_fill(skb, table, entry, table->tbl_id, + who_deleted) < 0) + goto free_skb; + nla_nest_end(skb, nest); + + nla_nest_end(skb, root); + + nlmsg_end(skb, nlh); + + return nlmsg_notify(rtnl, skb, 0, RTNLGRP_TC, 0, alloc_flags); + +free_skb: + kfree_skb(skb); + return err; +} + +static void __p4tc_table_entry_put(struct p4tc_table_entry *entry) +{ + struct p4tc_table_entry_value *value; + struct p4tc_table_entry_tm *tm; + + value = p4tc_table_entry_value(entry); + + if (value->acts) + p4tc_action_destroy(value->acts); + + kfree(value->entry_work); + tm = rcu_dereference_protected(value->tm, 1); + kfree(tm); + + kfree(entry); +} + +static void p4tc_table_entry_del_work(struct work_struct *work) +{ + struct p4tc_table_entry_work *entry_work = + container_of(work, typeof(*entry_work), work); + struct p4tc_pipeline *pipeline = entry_work->pipeline; + struct p4tc_table_entry *entry = entry_work->entry; + struct p4tc_table_entry_value *value; + + value = p4tc_table_entry_value(entry); + + if (entry_work->send_event && p4tc_ctrl_pub_ok(value->permissions)) + p4tc_tbl_entry_emit_event(entry_work, RTM_P4TC_DEL, GFP_KERNEL); + + if (value->is_dyn) + hrtimer_cancel(&value->entry_timer); + + put_net(pipeline->net); + p4tc_pipeline_put_ref(pipeline); + + __p4tc_table_entry_put(entry); +} + +static void p4tc_table_entry_put(struct p4tc_table_entry *entry, bool deferred) +{ + struct p4tc_table_entry_value *value = p4tc_table_entry_value(entry); + + if (deferred) { + struct p4tc_table_entry_work *entry_work = value->entry_work; + /* We have to free tc actions + * in a sleepable context + */ + struct p4tc_pipeline *pipeline = entry_work->pipeline; + + /* Avoid pipeline del before deferral ends */ + p4tc_pipeline_get(pipeline); + get_net(pipeline->net); /* avoid action cleanup */ + schedule_work(&entry_work->work); + } else { + if (value->is_dyn) + hrtimer_cancel(&value->entry_timer); + + __p4tc_table_entry_put(entry); + } +} + +static void p4tc_table_entry_put_rcu(struct rcu_head *rcu) +{ + struct p4tc_table_entry *entry = + container_of(rcu, struct p4tc_table_entry, rcu); + struct p4tc_table_entry_work *entry_work = + p4tc_table_entry_work(entry); + struct p4tc_pipeline *pipeline = entry_work->pipeline; + + p4tc_table_entry_put(entry, true); + + p4tc_pipeline_put_ref(pipeline); + put_net(pipeline->net); +} + +static void __p4tc_table_entry_destroy(struct p4tc_table *table, + struct p4tc_table_entry *entry, + bool remove_from_hash, bool send_event, + u16 who_deleted) +{ + /* !remove_from_hash and deferred deletion are incompatible + * as entries that defer deletion after a GP __must__ + * be removed from the hash + */ + if (remove_from_hash) + rhltable_remove(&table->tbl_entries, &entry->ht_node, + entry_hlt_params); + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + p4tc_table_entry_mask_del(table, entry); + + if (remove_from_hash) { + struct p4tc_table_entry_work *entry_work = + p4tc_table_entry_work(entry); + + entry_work->send_event = send_event; + entry_work->who_deleted = who_deleted; + /* guarantee net doesn't go down before async task runs */ + get_net(entry_work->pipeline->net); + /* guarantee pipeline isn't deleted before async task runs */ + p4tc_pipeline_get(entry_work->pipeline); + call_rcu(&entry->rcu, p4tc_table_entry_put_rcu); + } else { + p4tc_table_entry_put(entry, false); + } +} + +#define P4TC_TABLE_EXACT_PRIO 64000 + +static int p4tc_table_entry_exact_prio(void) +{ + return P4TC_TABLE_EXACT_PRIO; +} + +static int p4tc_table_entry_alloc_new_prio(struct p4tc_table *table) +{ + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) + return p4tc_table_entry_exact_prio(); + + return ida_alloc_min(&table->tbl_prio_idr, 1, + GFP_ATOMIC); +} + +static void p4tc_table_entry_free_prio(struct p4tc_table *table, u32 prio) +{ + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + ida_free(&table->tbl_prio_idr, prio); +} + +static int p4tc_table_entry_destroy(struct p4tc_table *table, + struct p4tc_table_entry *entry, + bool remove_from_hash, + bool send_event, u16 who_deleted) +{ + struct p4tc_table_entry_value *value = p4tc_table_entry_value(entry); + + /* Entry was deleted in parallel */ + if (!p4tc_tbl_entry_put(value)) + return -EBUSY; + + p4tc_table_entry_free_prio(table, value->prio); + + __p4tc_table_entry_destroy(table, entry, remove_from_hash, send_event, + who_deleted); + + atomic_dec(&table->tbl_nelems); + + return 0; +} + +static void p4tc_table_entry_destroy_noida(struct p4tc_table *table, + struct p4tc_table_entry *entry) +{ + /* Entry refcount was already decremented */ + __p4tc_table_entry_destroy(table, entry, true, false, 0); +} + +/* Only deletes entries when called from pipeline put */ +void p4tc_table_entry_destroy_hash(void *ptr, void *arg) +{ + struct p4tc_table_entry *entry = ptr; + struct p4tc_table *table = arg; + + p4tc_table_entry_destroy(table, entry, false, false, + P4TC_ENTITY_TC); +} + +static void p4tc_table_entry_put_table(struct p4tc_pipeline *pipeline, + struct p4tc_table *table) +{ + p4tc_table_put_ref(table); + p4tc_pipeline_put_ref(pipeline); +} + +static int p4tc_table_entry_get_table(struct net *net, + struct p4tc_pipeline **pipeline, + struct p4tc_table **table, + struct nlattr **tb, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + /* The following can only race with user driven events + * Netns is guaranteed to be alive + */ + u32 *ids = nl_path_attrs->ids; + u32 pipeid, tbl_id; + char *tblname; + int ret; + + rcu_read_lock(); + + pipeid = ids[P4TC_PID_IDX]; + + *pipeline = p4tc_pipeline_find_get(net, nl_path_attrs->pname, pipeid, + extack); + if (IS_ERR(*pipeline)) { + ret = PTR_ERR(*pipeline); + goto out; + } + + if (!p4tc_pipeline_sealed(*pipeline)) { + NL_SET_ERR_MSG(extack, + "Need to seal pipeline before issuing runtime command"); + ret = -EINVAL; + goto put; + } + + tbl_id = ids[P4TC_TBLID_IDX]; + tblname = tb[P4TC_ENTRY_TBLNAME] ? nla_data(tb[P4TC_ENTRY_TBLNAME]) : NULL; + + *table = p4tc_table_find_get(*pipeline, tblname, tbl_id, extack); + if (IS_ERR(*table)) { + ret = PTR_ERR(*table); + goto put; + } + + rcu_read_unlock(); + + return 0; + +put: + p4tc_pipeline_put_ref(*pipeline); + +out: + rcu_read_unlock(); + return ret; +} + +static void +p4tc_table_entry_assign_key_exact(struct p4tc_table_entry_key *key, u8 *keyblob) +{ + memcpy(key->fa_key, keyblob, BITS_TO_BYTES(key->keysz)); +} + +static void +p4tc_table_entry_assign_key_generic(struct p4tc_table_entry_key *key, + struct p4tc_table_entry_mask *mask, + u8 *keyblob, u8 *maskblob) +{ + u32 keysz = BITS_TO_BYTES(key->keysz); + + memcpy(key->fa_key, keyblob, keysz); + memcpy(mask->fa_value, maskblob, keysz); +} + +static int p4tc_table_entry_extract_key(struct p4tc_table *table, + struct nlattr **tb, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_mask *mask, + struct netlink_ext_ack *extack) +{ + bool is_exact = table->tbl_type == P4TC_TABLE_TYPE_EXACT; + void *keyblob, *maskblob; + u32 keysz; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ENTRY_KEY_BLOB)) { + NL_SET_ERR_MSG(extack, "Must specify key blobs"); + return -EINVAL; + } + + keysz = nla_len(tb[P4TC_ENTRY_KEY_BLOB]); + if (BITS_TO_BYTES(key->keysz) != keysz) { + NL_SET_ERR_MSG(extack, + "Key blob size and table key size differ"); + return -EINVAL; + } + + if (!is_exact) { + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ENTRY_MASK_BLOB)) { + NL_SET_ERR_MSG(extack, "Must specify mask blobs"); + return -EINVAL; + } + + if (keysz != nla_len(tb[P4TC_ENTRY_MASK_BLOB])) { + NL_SET_ERR_MSG(extack, + "Key and mask blob must have the same length"); + return -EINVAL; + } + } + + keyblob = nla_data(tb[P4TC_ENTRY_KEY_BLOB]); + if (is_exact) { + p4tc_table_entry_assign_key_exact(key, keyblob); + } else { + maskblob = nla_data(tb[P4TC_ENTRY_MASK_BLOB]); + p4tc_table_entry_assign_key_generic(key, mask, keyblob, + maskblob); + } + + return 0; +} + +static void p4tc_table_entry_build_key(struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_mask *mask) +{ + int i; + + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) + return; + + key->maskid = mask->mask_id; + + for (i = 0; i < BITS_TO_BYTES(key->keysz); i++) + key->fa_key[i] &= mask->fa_value[i]; +} + +static int ___p4tc_table_entry_del(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry *entry, + bool from_control) +__must_hold(RCU) +{ + u16 who_deleted = from_control ? P4TC_ENTITY_UNSPEC : P4TC_ENTITY_KERNEL; + struct p4tc_table_entry_value *value = p4tc_table_entry_value(entry); + + if (from_control) { + if (!p4tc_ctrl_delete_ok(value->permissions)) + return -EPERM; + } else { + if (!p4tc_data_delete_ok(value->permissions)) + return -EPERM; + } + + if (p4tc_table_entry_destroy(table, entry, true, !from_control, + who_deleted) < 0) + return -EBUSY; + + return 0; +} + +static int p4tc_table_entry_gd(struct net *net, struct sk_buff *skb, bool del, + u16 *permissions, struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + struct p4tc_table_entry_mask *mask = NULL, *new_mask; + struct nlattr *tb[P4TC_ENTRY_MAX + 1] = { NULL }; + struct p4tc_table_entry *entry = NULL; + struct p4tc_pipeline *pipeline = NULL; + struct p4tc_table_entry_value *value; + struct p4tc_table_entry_key *key; + u32 *ids = nl_path_attrs->ids; + bool has_listener = !!skb; + struct p4tc_table *table; + u16 who_deleted = 0; + bool get = !del; + u32 keysz_bytes; + u32 keysz_bits; + u32 prio; + int ret; + + ret = nla_parse_nested(tb, P4TC_ENTRY_MAX, arg, p4tc_entry_policy, + extack); + if (ret < 0) + return ret; + + ret = p4tc_table_entry_get_table(net, &pipeline, &table, tb, + nl_path_attrs, extack); + if (ret < 0) + return ret; + + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) { + prio = p4tc_table_entry_exact_prio(); + } else { + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_ENTRY_PRIO)) { + NL_SET_ERR_MSG(extack, "Must specify table entry priority"); + return -EINVAL; + } + prio = nla_get_u32(tb[P4TC_ENTRY_PRIO]); + } + + if (del && !p4tc_pipeline_sealed(pipeline)) { + NL_SET_ERR_MSG(extack, + "Unable to delete table entry in unsealed pipeline"); + ret = -EINVAL; + goto table_put; + } + + keysz_bits = table->tbl_keysz; + keysz_bytes = P4TC_KEYSZ_BYTES(table->tbl_keysz); + + key = kzalloc(struct_size(key, fa_key, keysz_bytes), GFP_KERNEL); + if (unlikely(!key)) { + NL_SET_ERR_MSG(extack, "Unable to allocate key"); + ret = -ENOMEM; + goto table_put; + } + + key->keysz = keysz_bits; + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) { + mask = kzalloc(struct_size(mask, fa_value, keysz_bytes), + GFP_KERNEL); + if (unlikely(!mask)) { + NL_SET_ERR_MSG(extack, "Failed to allocate mask"); + ret = -ENOMEM; + goto free_key; + } + mask->sz = key->keysz; + } + + ret = p4tc_table_entry_extract_key(table, tb, key, mask, extack); + if (unlikely(ret < 0)) { + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + kfree(mask); + + goto free_key; + } + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) { + new_mask = p4tc_table_entry_mask_find_byvalue(table, mask); + kfree(mask); + if (!new_mask) { + NL_SET_ERR_MSG(extack, "Unable to find entry mask"); + ret = -ENOENT; + goto free_key; + } else { + mask = new_mask; + } + } + + p4tc_table_entry_build_key(table, key, mask); + + rcu_read_lock(); + entry = p4tc_entry_lookup(table, key, prio); + if (!entry) { + NL_SET_ERR_MSG(extack, "Unable to find entry"); + ret = -ENOENT; + goto unlock; + } + + /* As we can run delete/update in parallel we might get a soon to be + * purged entry from the lookup + */ + value = p4tc_table_entry_value(entry); + if (get && !p4tc_tbl_entry_get(value)) { + NL_SET_ERR_MSG(extack, "Entry deleted in parallel"); + ret = -EBUSY; + goto unlock; + } + + if (del) { + if (tb[P4TC_ENTRY_WHODUNNIT]) + who_deleted = nla_get_u8(tb[P4TC_ENTRY_WHODUNNIT]); + } else { + if (!p4tc_ctrl_read_ok(value->permissions)) { + NL_SET_ERR_MSG(extack, + "Unable to read table entry"); + ret = -EPERM; + goto entry_put; + } + + if (!p4tc_ctrl_pub_ok(value->permissions)) { + NL_SET_ERR_MSG(extack, + "Unable to publish read entry"); + ret = -EPERM; + goto entry_put; + } + } + + if (has_listener) { + if (p4tc_tbl_entry_fill(skb, table, entry, table->tbl_id, + who_deleted) <= 0) { + NL_SET_ERR_MSG(extack, + "Unable to fill table entry attributes"); + ret = -EINVAL; + goto entry_put; + } + *permissions = value->permissions; + } + + if (del) { + ret = ___p4tc_table_entry_del(pipeline, table, entry, true); + if (ret < 0) { + if (ret == -EBUSY) + NL_SET_ERR_MSG(extack, + "Entry was deleted in parallel"); + goto entry_put; + } + + if (!has_listener) + goto out; + } + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + +out: + ret = 0; + +entry_put: + if (get) + p4tc_tbl_entry_put_ref(value); + +unlock: + rcu_read_unlock(); + +free_key: + kfree(key); + +table_put: + p4tc_table_entry_put_table(pipeline, table); + + return ret; +} + +static int p4tc_table_entry_flush(struct net *net, struct sk_buff *skb, + struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + u32 *ids = nl_path_attrs->ids; + struct nlattr *tb[P4TC_ENTRY_MAX + 1] = { NULL }; + u32 arg_ids[P4TC_PATH_MAX - 1]; + struct p4tc_pipeline *pipeline; + struct p4tc_table_entry *entry; + struct rhashtable_iter iter; + bool has_listener = !!skb; + struct p4tc_table *table; + unsigned char *b; + int ret = 0; + int i = 0; + + if (arg) { + ret = nla_parse_nested(tb, P4TC_ENTRY_MAX, arg, + p4tc_entry_policy, extack); + if (ret < 0) + return ret; + } + + ret = p4tc_table_entry_get_table(net, &pipeline, &table, tb, + nl_path_attrs, extack); + if (ret < 0) + return ret; + + if (has_listener) + b = nlmsg_get_pos(skb); + + if (!ids[P4TC_TBLID_IDX]) + arg_ids[P4TC_TBLID_IDX - 1] = table->tbl_id; + + if (has_listener && nla_put(skb, P4TC_PATH, sizeof(arg_ids), arg_ids)) { + ret = -ENOMEM; + goto out_nlmsg_trim; + } + + /* There is an issue here regarding the stability of walking an + * rhashtable. If an insert or a delete happens in parallel, we may see + * duplicate entries or skip some valid entries. To solve this we are + * going to have an auxiliary list that also stores the entries and will + * be used for flushing, instead of walking over the rhastable. + */ + rhltable_walk_enter(&table->tbl_entries, &iter); + do { + rhashtable_walk_start(&iter); + + while ((entry = rhashtable_walk_next(&iter)) && !IS_ERR(entry)) { + struct p4tc_table_entry_value *value = + p4tc_table_entry_value(entry); + + if (!p4tc_ctrl_delete_ok(value->permissions)) { + ret = -EPERM; + continue; + } + + ret = p4tc_table_entry_destroy(table, entry, true, false, + P4TC_ENTITY_UNSPEC); + if (ret < 0) + continue; + + i++; + } + + rhashtable_walk_stop(&iter); + } while (entry == ERR_PTR(-EAGAIN)); + rhashtable_walk_exit(&iter); + + /* If another user creates a table entry in parallel with this flush, + * we may not be able to flush all the entries. So the user should + * verify after flush to check for this. + */ + + if (has_listener) { + if (nla_put_u32(skb, P4TC_COUNT, i)) + goto out_nlmsg_trim; + } + + if (ret < 0) { + if (i == 0) { + NL_SET_ERR_MSG_WEAK(extack, + "Unable to flush any entries"); + goto out_nlmsg_trim; + } else { + if (!extack->_msg) + NL_SET_ERR_MSG_FMT(extack, + "Flush only %u table entries", + i); + } + } + + if (has_listener) { + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + } + + ret = 0; + goto table_put; + +out_nlmsg_trim: + if (has_listener) + nlmsg_trim(skb, b); + +table_put: + p4tc_table_entry_put_table(pipeline, table); + + return ret; +} + +static enum hrtimer_restart entry_timer_handle(struct hrtimer *timer) +{ + struct p4tc_table_entry_value *value = + container_of(timer, struct p4tc_table_entry_value, entry_timer); + struct p4tc_table_entry_tm *tm; + struct p4tc_table_entry *entry; + u64 aging_ms = value->aging_ms; + struct p4tc_table *table; + u64 tdiff, lastused; + + rcu_read_lock(); + tm = rcu_dereference(value->tm); + lastused = tm->lastused; + rcu_read_unlock(); + + tdiff = jiffies64_to_msecs(get_jiffies_64() - lastused); + + if (tdiff < aging_ms) { + hrtimer_forward_now(timer, ms_to_ktime(aging_ms)); + return HRTIMER_RESTART; + } + + entry = value->entry_work->entry; + table = value->entry_work->table; + + p4tc_table_entry_destroy(table, entry, true, + true, P4TC_ENTITY_TIMER); + + return HRTIMER_NORESTART; +} + +static struct p4tc_table_entry_tm * +p4tc_table_entry_create_tm(const u16 whodunnit) +{ + struct p4tc_table_entry_tm *dtm; + + dtm = kzalloc(sizeof(*dtm), GFP_ATOMIC); + if (unlikely(!dtm)) + return ERR_PTR(-ENOMEM); + + dtm->who_created = whodunnit; + dtm->who_deleted = P4TC_ENTITY_UNSPEC; + dtm->created = jiffies; + dtm->firstused = 0; + dtm->lastused = jiffies; + + return dtm; +} + +/* Invoked from both control and data path */ +static int __p4tc_table_entry_create(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry *entry, + struct p4tc_table_entry_mask *mask, + u16 whodunnit, bool from_control) +__must_hold(RCU) +{ + struct p4tc_table_entry_mask *mask_found = NULL; + struct p4tc_table_entry_work *entry_work; + struct p4tc_table_entry_value *value; + struct p4tc_table_perm *tbl_perm; + struct p4tc_table_entry_tm *dtm; + u16 permissions; + int ret; + + value = p4tc_table_entry_value(entry); + /* We set it to zero on create an update to avoid having entry + * deletion in parallel before we report to user space. + */ + refcount_set(&value->entries_ref, 0); + + tbl_perm = rcu_dereference(table->tbl_permissions); + permissions = tbl_perm->permissions; + if (from_control) { + if (!p4tc_ctrl_create_ok(permissions)) + return -EPERM; + } else { + if (!p4tc_data_create_ok(permissions)) + return -EPERM; + } + + /* From data plane we can only create entries on exact match */ + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) { + mask_found = p4tc_table_entry_mask_add(table, entry, mask); + if (IS_ERR(mask_found)) { + ret = PTR_ERR(mask_found); + goto out; + } + } + + p4tc_table_entry_build_key(table, &entry->key, mask_found); + + if (p4tc_entry_lookup(table, &entry->key, value->prio)) { + ret = -EEXIST; + goto rm_masks_idr; + } + + dtm = p4tc_table_entry_create_tm(whodunnit); + if (IS_ERR(dtm)) { + ret = PTR_ERR(dtm); + goto rm_masks_idr; + } + + rcu_assign_pointer(value->tm, dtm); + + entry_work = kzalloc(sizeof(*entry_work), GFP_ATOMIC); + if (unlikely(!entry_work)) { + ret = -ENOMEM; + goto free_tm; + } + + entry_work->pipeline = pipeline; + entry_work->table = table; + entry_work->entry = entry; + value->entry_work = entry_work; + + INIT_WORK(&entry_work->work, p4tc_table_entry_del_work); + + if (atomic_inc_return(&table->tbl_nelems) > table->tbl_max_entries) { + atomic_dec(&table->tbl_nelems); + ret = -ENOSPC; + goto free_work; + } + + if (rhltable_insert(&table->tbl_entries, &entry->ht_node, + entry_hlt_params) < 0) { + atomic_dec(&table->tbl_nelems); + ret = -EBUSY; + goto free_work; + } + + if (value->is_dyn) { + /* Only use table template aging if user didn't specify one */ + value->aging_ms = value->aging_ms ?: table->tbl_aging; + + hrtimer_init(&value->entry_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + value->entry_timer.function = &entry_timer_handle; + hrtimer_start(&value->entry_timer, ms_to_ktime(value->aging_ms), + HRTIMER_MODE_REL); + } + + if (!from_control && p4tc_ctrl_pub_ok(value->permissions)) + p4tc_tbl_entry_emit_event(entry_work, RTM_P4TC_CREATE, + GFP_ATOMIC); + + return 0; + +free_work: + kfree(entry_work); + +free_tm: + kfree(dtm); + +rm_masks_idr: + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + p4tc_table_entry_mask_del(table, entry); +out: + return ret; +} + +/* Invoked from both control and data path */ +static int __p4tc_table_entry_update(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry *entry, + struct p4tc_table_entry_mask *mask, + u16 whodunnit, bool from_control) +__must_hold(RCU) +{ + struct p4tc_table_entry_mask *mask_found = NULL; + struct p4tc_table_entry_work *entry_work; + struct p4tc_table_entry_value *value_old; + struct p4tc_table_entry_value *value; + struct p4tc_table_entry *entry_old; + struct p4tc_table_entry_tm *tm_old; + struct p4tc_table_entry_tm *tm; + int ret; + + value = p4tc_table_entry_value(entry); + /* We set it to zero on update to avoid having entry removed from the + * rhashtable in parallel before we report to user space. + */ + refcount_set(&value->entries_ref, 0); + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) { + mask_found = p4tc_table_entry_mask_add(table, entry, mask); + if (IS_ERR(mask_found)) { + ret = PTR_ERR(mask_found); + goto out; + } + } + + p4tc_table_entry_build_key(table, &entry->key, mask_found); + + entry_old = p4tc_entry_lookup(table, &entry->key, value->prio); + if (!entry_old) { + ret = -ENOENT; + goto rm_masks_idr; + } + + /* In case of parallel update, the thread that arrives here first will + * get the right to update. + * + * In case of a parallel get/update, whoever is second will fail + * appropriately. + */ + value_old = p4tc_table_entry_value(entry_old); + if (!p4tc_tbl_entry_put(value_old)) { + ret = -EAGAIN; + goto rm_masks_idr; + } + + if (from_control) { + if (!p4tc_ctrl_update_ok(value_old->permissions)) { + ret = -EPERM; + goto set_entries_refcount; + } + } else { + if (!p4tc_data_update_ok(value_old->permissions)) { + ret = -EPERM; + goto set_entries_refcount; + } + } + + tm = kzalloc(sizeof(*tm), GFP_ATOMIC); + if (unlikely(!tm)) { + ret = -ENOMEM; + goto set_entries_refcount; + } + + tm_old = rcu_dereference_protected(value_old->tm, 1); + *tm = *tm_old; + + tm->lastused = jiffies; + tm->who_updated = whodunnit; + + if (value->permissions == P4TC_PERMISSIONS_UNINIT) + value->permissions = value_old->permissions; + + rcu_assign_pointer(value->tm, tm); + + entry_work = kzalloc(sizeof(*(entry_work)), GFP_ATOMIC); + if (unlikely(!entry_work)) { + ret = -ENOMEM; + goto free_tm; + } + + entry_work->pipeline = pipeline; + entry_work->table = table; + entry_work->entry = entry; + value->entry_work = entry_work; + if (!value->is_dyn) + value->is_dyn = value_old->is_dyn; + + if (value->is_dyn) { + /* Only use old entry value if user didn't specify new one */ + value->aging_ms = value->aging_ms ?: value_old->aging_ms; + + hrtimer_init(&value->entry_timer, CLOCK_MONOTONIC, + HRTIMER_MODE_REL); + value->entry_timer.function = &entry_timer_handle; + + hrtimer_start(&value->entry_timer, ms_to_ktime(value->aging_ms), + HRTIMER_MODE_REL); + } + + INIT_WORK(&entry_work->work, p4tc_table_entry_del_work); + + if (rhltable_insert(&table->tbl_entries, &entry->ht_node, + entry_hlt_params) < 0) { + ret = -EEXIST; + goto free_entry_work; + } + + p4tc_table_entry_destroy_noida(table, entry_old); + + if (!from_control && p4tc_ctrl_pub_ok(value->permissions)) + p4tc_tbl_entry_emit_event(entry_work, RTM_P4TC_UPDATE, + GFP_ATOMIC); + + return 0; + +free_entry_work: + kfree(entry_work); + +free_tm: + kfree(tm); + +set_entries_refcount: + refcount_set(&value_old->entries_ref, 1); + +rm_masks_idr: + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + p4tc_table_entry_mask_del(table, entry); + +out: + return ret; +} + +static bool p4tc_table_check_entry_act(struct p4tc_table *table, + struct tc_action *entry_act) +{ + struct p4tc_table_act *table_act; + + list_for_each_entry(table_act, &table->tbl_acts_list, node) { + if (table_act->ops->id != entry_act->ops->id) + continue; + + if (!(table_act->flags & + BIT(P4TC_TABLE_ACTS_DEFAULT_ONLY))) + return true; + } + + return false; +} + +static struct nla_policy p4tc_table_attrs_policy[P4TC_ENTRY_TBL_ATTRS_MAX + 1] = { + [P4TC_ENTRY_TBL_ATTRS_DEFAULT_HIT] = { .type = NLA_NESTED }, + [P4TC_ENTRY_TBL_ATTRS_DEFAULT_MISS] = { .type = NLA_NESTED }, + [P4TC_ENTRY_TBL_ATTRS_PERMISSIONS] = NLA_POLICY_MAX(NLA_U16, P4TC_MAX_PERMISSION), +}; + +static int +update_tbl_attrs(struct net *net, struct p4tc_table *table, + struct nlattr *table_attrs, + struct netlink_ext_ack *extack) +{ + struct p4tc_table_default_act_params def_params = {0}; + struct nlattr *tb[P4TC_ENTRY_TBL_ATTRS_MAX + 1]; + struct p4tc_table_perm *tbl_perm = NULL; + int err; + + err = nla_parse_nested(tb, P4TC_ENTRY_TBL_ATTRS_MAX, table_attrs, + p4tc_table_attrs_policy, extack); + if (err < 0) + return err; + + if (tb[P4TC_ENTRY_TBL_ATTRS_PERMISSIONS]) { + u16 permissions; + + if (atomic_read(&table->tbl_nelems) > 0) { + NL_SET_ERR_MSG(extack, + "Unable to set table permissions if it already has entries"); + return -EINVAL; + } + + permissions = nla_get_u16(tb[P4TC_ENTRY_TBL_ATTRS_PERMISSIONS]); + tbl_perm = p4tc_table_init_permissions(table, permissions, + extack); + if (IS_ERR(tbl_perm)) + return PTR_ERR(tbl_perm); + } + + def_params.default_hit_attr = tb[P4TC_ENTRY_TBL_ATTRS_DEFAULT_HIT]; + def_params.default_miss_attr = tb[P4TC_ENTRY_TBL_ATTRS_DEFAULT_MISS]; + + err = p4tc_table_init_default_acts(net, &def_params, table, + &table->tbl_acts_list, extack); + if (err < 0) + goto free_tbl_perm; + + p4tc_table_replace_default_acts(table, &def_params, true); + p4tc_table_replace_permissions(table, tbl_perm, true); + + return 0; + +free_tbl_perm: + kfree(tbl_perm); + return err; +} + +static u16 p4tc_table_entry_tbl_permcpy(const u16 tblperm) +{ + return p4tc_ctrl_perm_rm_create(p4tc_data_perm_rm_create(tblperm)); +} + +#define P4TC_TBL_ENTRY_CU_FLAG_CREATE 0x1 +#define P4TC_TBL_ENTRY_CU_FLAG_UPDATE 0x2 +#define P4TC_TBL_ENTRY_CU_FLAG_SET 0x4 + +static struct p4tc_table_entry * +__p4tc_table_entry_cu(struct net *net, u8 cu_flags, struct nlattr **tb, + struct p4tc_pipeline *pipeline, struct p4tc_table *table, + struct netlink_ext_ack *extack) +{ + bool replace = cu_flags == P4TC_TBL_ENTRY_CU_FLAG_UPDATE; + bool set = cu_flags == P4TC_TBL_ENTRY_CU_FLAG_SET; + u8 __mask[sizeof(struct p4tc_table_entry_mask) + + BITS_TO_BYTES(P4TC_MAX_KEYSZ)] = { 0 }; + struct p4tc_table_entry_mask *mask = (void *)&__mask; + struct p4tc_table_entry_value *value; + u8 whodunnit = P4TC_ENTITY_UNSPEC; + struct p4tc_table_entry *entry; + u32 keysz_bytes; + u32 keysz_bits; + u16 tblperm; + int ret = 0; + u32 entrysz; + u32 prio; + + prio = tb[P4TC_ENTRY_PRIO] ? nla_get_u32(tb[P4TC_ENTRY_PRIO]) : 0; + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT && replace) { + if (!prio) { + NL_SET_ERR_MSG(extack, "Must specify entry priority"); + return ERR_PTR(-EINVAL); + } + } else { + if (table->tbl_type == P4TC_TABLE_TYPE_EXACT) { + if (prio) { + NL_SET_ERR_MSG(extack, + "Mustn't specify entry priority for exact"); + return ERR_PTR(-EINVAL); + } + prio = p4tc_table_entry_alloc_new_prio(table); + } else { + if (prio) + ret = ida_alloc_range(&table->tbl_prio_idr, + prio, prio, GFP_ATOMIC); + else + ret = p4tc_table_entry_alloc_new_prio(table); + if (ret < 0) { + NL_SET_ERR_MSG(extack, + "Unable to allocate priority"); + return ERR_PTR(ret); + } + prio = ret; + } + } + + whodunnit = nla_get_u8(tb[P4TC_ENTRY_WHODUNNIT]); + + keysz_bits = table->tbl_keysz; + keysz_bytes = P4TC_KEYSZ_BYTES(keysz_bits); + + /* Entry memory layout: + * { entry:key __aligned(8):value } + */ + entrysz = sizeof(*entry) + keysz_bytes + + sizeof(struct p4tc_table_entry_value); + + entry = kzalloc(entrysz, GFP_KERNEL); + if (unlikely(!entry)) { + NL_SET_ERR_MSG(extack, "Unable to allocate table entry"); + ret = -ENOMEM; + goto idr_rm; + } + + entry->key.keysz = keysz_bits; + mask->sz = keysz_bits; + + ret = p4tc_table_entry_extract_key(table, tb, &entry->key, mask, extack); + if (ret < 0) + goto free_entry; + + value = p4tc_table_entry_value(entry); + value->prio = prio; + + rcu_read_lock(); + tblperm = rcu_dereference(table->tbl_permissions)->permissions; + rcu_read_unlock(); + + if (tb[P4TC_ENTRY_PERMISSIONS]) { + u16 nlperm; + + nlperm = nla_get_u16(tb[P4TC_ENTRY_PERMISSIONS]); + if (~tblperm & nlperm) { + NL_SET_ERR_MSG(extack, + "Trying to set permission bits which aren't allowed by table"); + ret = -EINVAL; + goto free_entry; + } + + if (p4tc_ctrl_create_ok(nlperm) || p4tc_data_create_ok(nlperm)) { + NL_SET_ERR_MSG(extack, + "Create permission for table entry doesn't make sense"); + ret = -EINVAL; + goto free_entry; + } + value->permissions = nlperm; + } else { + if (replace) + value->permissions = P4TC_PERMISSIONS_UNINIT; + else + value->permissions = + p4tc_table_entry_tbl_permcpy(tblperm); + } + + if (tb[P4TC_ENTRY_ACT]) { + value->acts = kcalloc(TCA_ACT_MAX_PRIO, + sizeof(struct tc_action *), GFP_KERNEL); + if (unlikely(!value->acts)) { + ret = -ENOMEM; + goto free_entry; + } + + ret = p4tc_action_init(net, tb[P4TC_ENTRY_ACT], value->acts, + table->common.p_id, + TCA_ACT_FLAGS_NO_RTNL, extack); + if (unlikely(ret < 0)) { + kfree(value->acts); + value->acts = NULL; + goto free_entry; + } else if (ret > 1) { + NL_SET_ERR_MSG(extack, + "Can only have one entry action"); + ret = -EINVAL; + goto free_acts; + } + + value->num_acts = ret; + + if (!p4tc_table_check_entry_act(table, value->acts[0])) { + ret = -EPERM; + NL_SET_ERR_MSG(extack, + "Action is not allowed as entry action"); + goto free_acts; + } + } + + if (!replace) { + if ((!tb[P4TC_ENTRY_AGING] && tb[P4TC_ENTRY_DYNAMIC]) || + (tb[P4TC_ENTRY_AGING] && !tb[P4TC_ENTRY_DYNAMIC])) { + NL_SET_ERR_MSG(extack, + "Aging may only be set alongside dynamic"); + ret = -EINVAL; + goto free_acts; + } + } + + if (tb[P4TC_ENTRY_AGING]) + value->aging_ms = nla_get_u64(tb[P4TC_ENTRY_AGING]); + + if (tb[P4TC_ENTRY_DYNAMIC]) + value->is_dyn = true; + + rcu_read_lock(); + if (replace) { + ret = __p4tc_table_entry_update(pipeline, table, entry, mask, + whodunnit, true); + } else { + ret = __p4tc_table_entry_create(pipeline, table, entry, mask, + whodunnit, true); + if (set && ret == -EEXIST) + ret = __p4tc_table_entry_update(pipeline, table, entry, + mask, whodunnit, true); + } + rcu_read_unlock(); + if (ret < 0) { + if ((replace || set) && ret == -EAGAIN) + NL_SET_ERR_MSG(extack, + "Entry was being updated in parallel"); + + if (ret == -ENOSPC) + NL_SET_ERR_MSG(extack, "Table max entries reached"); + else + NL_SET_ERR_MSG(extack, "Failed to create/update entry"); + + goto free_acts; + } + + return entry; + +free_acts: + p4tc_action_destroy(value->acts); + +free_entry: + kfree(entry); + +idr_rm: + if (!replace) + p4tc_table_entry_free_prio(table, prio); + + return ERR_PTR(ret); +} + +static int p4tc_table_entry_cu(struct net *net, struct sk_buff *skb, + u8 cu_flags, u16 *permissions, + struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + bool replace = cu_flags == P4TC_TBL_ENTRY_CU_FLAG_UPDATE; + struct nlattr *tb[P4TC_ENTRY_MAX + 1] = { NULL }; + struct p4tc_table_entry_value *value; + struct p4tc_pipeline *pipeline; + struct p4tc_table_entry *entry; + u32 *ids = nl_path_attrs->ids; + bool has_listener = !!skb; + struct p4tc_table *table; + int ret; + + ret = nla_parse_nested(tb, P4TC_ENTRY_MAX, arg, p4tc_entry_policy, + extack); + if (ret < 0) + return ret; + + ret = p4tc_table_entry_get_table(net, &pipeline, &table, tb, + nl_path_attrs, extack); + if (ret < 0) + return ret; + + if (replace && tb[P4TC_ENTRY_TBL_ATTRS]) { + /* Table attributes update */ + ret = update_tbl_attrs(net, table, + tb[P4TC_ENTRY_TBL_ATTRS], + extack); + goto table_put; + } else { + /* Table entry create or update */ + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_ENTRY_WHODUNNIT)) { + NL_SET_ERR_MSG(extack, + "Must specify whodunnit attribute"); + ret = -EINVAL; + goto table_put; + } + } + + entry = __p4tc_table_entry_cu(net, cu_flags, tb, pipeline, table, + extack); + if (IS_ERR(entry)) { + ret = PTR_ERR(entry); + goto table_put; + } + + value = p4tc_table_entry_value(entry); + if (has_listener) { + if (p4tc_ctrl_pub_ok(value->permissions)) { + if (p4tc_tbl_entry_fill(skb, table, entry, table->tbl_id, + P4TC_ENTITY_UNSPEC) <= 0) + NL_SET_ERR_MSG(extack, + "Unable to fill table entry attributes"); + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, + pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!ids[P4TC_PID_IDX]) + ids[P4TC_PID_IDX] = pipeline->common.p_id; + } + + *permissions = value->permissions; + } + + /* We set it to zero on create an update to avoid having the entry + * deleted in parallel before we report to user space. + * We only set it to 1 here, after reporting. + */ + refcount_set(&value->entries_ref, 1); + +table_put: + p4tc_table_entry_put_table(pipeline, table); + return ret; +} + +struct p4tc_table_entry * +p4tc_table_const_entry_cu(struct net *net, + struct nlattr *arg, + struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ENTRY_MAX + 1] = { NULL }; + u8 cu_flags = P4TC_TBL_ENTRY_CU_FLAG_CREATE; + struct p4tc_table_entry_value *value; + struct p4tc_table_entry *entry; + int ret; + + ret = nla_parse_nested(tb, P4TC_ENTRY_MAX, arg, p4tc_entry_policy, + extack); + if (ret < 0) + return ERR_PTR(ret); + + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_ENTRY_WHODUNNIT)) { + NL_SET_ERR_MSG(extack, "Must specify whodunnit attribute"); + return ERR_PTR(-EINVAL); + } + + entry = __p4tc_table_entry_cu(net, cu_flags, tb, pipeline, table, + extack); + if (IS_ERR(entry)) + return entry; + + value = p4tc_table_entry_value(entry); + refcount_set(&value->entries_ref, 1); + + return entry; +} + +static int p4tc_tbl_entry_get_1(struct net *net, struct sk_buff *skb, + struct nlattr *arg, u16 *permissions, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MAX + 1]; + u32 *arg_ids; + int ret = 0; + + ret = nla_parse_nested(tb, P4TC_MAX, arg, p4tc_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_PATH)) { + NL_SET_ERR_MSG(extack, "Must specify object path"); + return -EINVAL; + } + + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_PARAMS)) { + NL_SET_ERR_MSG(extack, "Must specify parameters"); + return -EINVAL; + } + + arg_ids = nla_data(tb[P4TC_PATH]); + memcpy(&nl_path_attrs->ids[P4TC_TBLID_IDX], arg_ids, + nla_len(tb[P4TC_PATH])); + + return p4tc_table_entry_gd(net, skb, false, permissions, + tb[P4TC_PARAMS], nl_path_attrs, extack); +} + +static int p4tc_tbl_entry_del_1(struct net *net, struct sk_buff *skb, + bool flush, u16 *permissions, + struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MAX + 1]; + u32 *arg_ids; + int ret = 0; + + ret = nla_parse_nested(tb, P4TC_MAX, arg, p4tc_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_PATH)) { + NL_SET_ERR_MSG(extack, "Must specify object path"); + return -EINVAL; + } + + arg_ids = nla_data(tb[P4TC_PATH]); + memcpy(&nl_path_attrs->ids[P4TC_TBLID_IDX], arg_ids, + nla_len(tb[P4TC_PATH])); + + if (flush) { + ret = p4tc_table_entry_flush(net, skb, tb[P4TC_PARAMS], + nl_path_attrs, extack); + } else { + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_PARAMS)) { + NL_SET_ERR_MSG(extack, "Must specify parameters"); + return -EINVAL; + } + ret = p4tc_table_entry_gd(net, skb, true, permissions, + tb[P4TC_PARAMS], nl_path_attrs, + extack); + } + + return ret; +} + +static int p4tc_tbl_entry_cu_1(struct net *net, struct sk_buff *skb, + u8 cu_flags, u16 *permissions, + struct nlattr *nla, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_MAX + 1]; + u32 *tbl_id; + int ret = 0; + + ret = nla_parse_nested(tb, P4TC_MAX, nla, p4tc_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, nla, tb, P4TC_PATH)) { + NL_SET_ERR_MSG(extack, "Must specify object path"); + return -EINVAL; + } + + if (NL_REQ_ATTR_CHECK(extack, nla, tb, P4TC_PARAMS)) { + NL_SET_ERR_MSG(extack, "Must specify object attributes"); + return -EINVAL; + } + + tbl_id = nla_data(tb[P4TC_PATH]); + memcpy(&nl_path_attrs->ids[P4TC_TBLID_IDX], tbl_id, + nla_len(tb[P4TC_PATH])); + + return p4tc_table_entry_cu(net, skb, cu_flags, permissions, + tb[P4TC_PARAMS], nl_path_attrs, extack); +} + +static int __p4tc_tbl_entry_crud(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, int cmd, char *p_name, + struct nlattr *p4tca[], + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct p4tc_path_nlattrs nl_path_attrs = {0}; + u32 portid = NETLINK_CB(skb).portid; + u16 permissions = P4TC_CTRL_PERM_P; + u32 ids[P4TC_PATH_MAX] = { 0 }; + int i, num_pub_permission = 0; + int ret = 0, ret_send; + struct p4tcmsg *t_new; + struct sk_buff *nskb; + struct nlmsghdr *nlh; + struct nlattr *pn_att; + struct nlattr *root; + + nskb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (unlikely(!nskb)) + return -ENOBUFS; + + nlh = nlmsg_put(nskb, portid, n->nlmsg_seq, cmd, sizeof(*t), + n->nlmsg_flags); + if (unlikely(!nlh)) + goto out; + + t_new = nlmsg_data(nlh); + t_new->pipeid = t->pipeid; + t_new->obj = t->obj; + ids[P4TC_PID_IDX] = t_new->pipeid; + nl_path_attrs.ids = ids; + + pn_att = nla_reserve(nskb, P4TC_ROOT_PNAME, P4TC_PIPELINE_NAMSIZ); + if (unlikely(!pn_att)) { + ret = -ENOMEM; + goto out; + } + + nl_path_attrs.pname = nla_data(pn_att); + if (!p_name) { + /* Filled up by the operation or forced failure */ + memset(nl_path_attrs.pname, 0, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = false; + } else { + strscpy(nl_path_attrs.pname, p_name, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = true; + } + + root = nla_nest_start(nskb, P4TC_ROOT); + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && p4tca[i]; i++) { + struct nlattr *nest = nla_nest_start(nskb, i); + + if (cmd == RTM_P4TC_GET) + ret = p4tc_tbl_entry_get_1(net, nskb, p4tca[i], + &permissions, &nl_path_attrs, + extack); + else if (cmd == RTM_P4TC_CREATE || + cmd == RTM_P4TC_UPDATE) { + u8 cu_flags; + + if (cmd == RTM_P4TC_UPDATE) + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_UPDATE; + else + if (n->nlmsg_flags & NLM_F_REPLACE) + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_SET; + else + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_CREATE; + + ret = p4tc_tbl_entry_cu_1(net, nskb, cu_flags, + &permissions, + p4tca[i], &nl_path_attrs, + extack); + } else if (cmd == RTM_P4TC_DEL) { + bool flush = nlh->nlmsg_flags & NLM_F_ROOT; + + ret = p4tc_tbl_entry_del_1(net, nskb, flush, + &permissions, p4tca[i], + &nl_path_attrs, extack); + } + + if (p4tc_ctrl_pub_ok(permissions)) { + num_pub_permission++; + } else { + nla_nest_cancel(nskb, nest); + continue; + } + + if (ret < 0) { + if (i == 1) { + goto out; + } else { + nla_nest_cancel(nskb, nest); + break; + } + } + nla_nest_end(nskb, nest); + } + nla_nest_end(nskb, root); + + if (!t_new->pipeid) + t_new->pipeid = ids[P4TC_PID_IDX]; + + nlmsg_end(nskb, nlh); + + if (cmd == RTM_P4TC_GET) { + ret_send = rtnl_unicast(nskb, net, portid); + } else if (num_pub_permission) { + ret_send = rtnetlink_send(nskb, net, portid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + } else { + ret_send = 0; + kfree_skb(nskb); + } + + return ret_send ? ret_send : ret; + +out: + kfree_skb(nskb); + return ret; +} + +static int __p4tc_tbl_entry_crud_fast(struct net *net, struct nlmsghdr *n, + int cmd, char *p_name, + struct nlattr *p4tca[], + struct netlink_ext_ack *extack) +{ + struct p4tcmsg *t = (struct p4tcmsg *)nlmsg_data(n); + struct p4tc_path_nlattrs nl_path_attrs = {0}; + u32 ids[P4TC_PATH_MAX] = { 0 }; + int ret = 0; + int i; + + ids[P4TC_PID_IDX] = t->pipeid; + nl_path_attrs.ids = ids; + + /* Only read for searching the pipeline */ + nl_path_attrs.pname = p_name; + + for (i = 1; i < P4TC_MSGBATCH_SIZE + 1 && p4tca[i]; i++) { + if (cmd == RTM_P4TC_CREATE || + cmd == RTM_P4TC_UPDATE) { + u8 cu_flags; + + if (cmd == RTM_P4TC_UPDATE) + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_UPDATE; + else + if (n->nlmsg_flags & NLM_F_REPLACE) + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_SET; + else + cu_flags = P4TC_TBL_ENTRY_CU_FLAG_CREATE; + + ret = p4tc_tbl_entry_cu_1(net, NULL, cu_flags, NULL, + p4tca[i], &nl_path_attrs, + extack); + } else if (cmd == RTM_P4TC_DEL) { + bool flush = n->nlmsg_flags & NLM_F_ROOT; + + ret = p4tc_tbl_entry_del_1(net, NULL, flush, NULL, + p4tca[i], &nl_path_attrs, + extack); + } + + if (ret < 0) + goto out; + } + +out: + return ret; +} + +int p4tc_tbl_entry_crud(struct net *net, struct sk_buff *skb, + struct nlmsghdr *n, int cmd, + struct netlink_ext_ack *extack) +{ + struct nlattr *p4tca[P4TC_MSGBATCH_SIZE + 1]; + int echo = n->nlmsg_flags & NLM_F_ECHO; + struct nlattr *tb[P4TC_ROOT_MAX + 1]; + char *p_name = NULL; + int listeners; + int ret = 0; + + ret = nlmsg_parse(n, sizeof(struct p4tcmsg), tb, P4TC_ROOT_MAX, + p4tc_root_policy, extack); + if (ret < 0) + return ret; + + if (NL_REQ_ATTR_CHECK(extack, NULL, tb, P4TC_ROOT)) { + NL_SET_ERR_MSG(extack, "Netlink P4TC table attributes missing"); + return -EINVAL; + } + + ret = nla_parse_nested(p4tca, P4TC_MSGBATCH_SIZE, tb[P4TC_ROOT], NULL, + extack); + if (ret < 0) + return ret; + + if (!p4tca[1]) { + NL_SET_ERR_MSG(extack, "No elements in root table array"); + return -EINVAL; + } + + if (tb[P4TC_ROOT_PNAME]) + p_name = nla_data(tb[P4TC_ROOT_PNAME]); + + listeners = rtnl_has_listeners(net, RTNLGRP_TC); + + if ((echo || listeners) || cmd == RTM_P4TC_GET) + ret = __p4tc_tbl_entry_crud(net, skb, n, cmd, p_name, p4tca, + extack); + else + ret = __p4tc_tbl_entry_crud_fast(net, n, cmd, p_name, p4tca, + extack); + return ret; +} + +static int p4tc_table_entry_dump(struct net *net, struct sk_buff *skb, + struct nlattr *arg, + struct p4tc_path_nlattrs *nl_path_attrs, + struct netlink_callback *cb, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[P4TC_ENTRY_MAX + 1] = { NULL }; + struct p4tc_dump_ctx *ctx = (void *)cb->ctx; + unsigned char *b = nlmsg_get_pos(skb); + struct p4tc_pipeline *pipeline = NULL; + struct p4tc_table_entry *entry = NULL; + struct p4tc_table *table; + int i = 0; + int ret; + + if (arg) { + ret = nla_parse_nested(tb, P4TC_ENTRY_MAX, arg, + p4tc_entry_policy, extack); + if (ret < 0) { + kfree(ctx->iter); + return ret; + } + } + + ret = p4tc_table_entry_get_table(net, &pipeline, &table, tb, + nl_path_attrs, extack); + if (ret < 0) { + kfree(ctx->iter); + return ret; + } + + if (!ctx->iter) { + ctx->iter = kzalloc(sizeof(*ctx->iter), GFP_KERNEL); + if (!ctx->iter) { + ret = -ENOMEM; + goto table_put; + } + + rhltable_walk_enter(&table->tbl_entries, ctx->iter); + } + + /* There is an issue here regarding the stability of walking an + * rhashtable. If an insert or a delete happens in parallel, we may see + * duplicate entries or skip some valid entries. To solve this we are + * going to have an auxiliary list that also stores the entries and will + * be used for dump, instead of walking over the rhastable. + */ + ret = -ENOMEM; + rhashtable_walk_start(ctx->iter); + do { + for (i = 0; i < P4TC_MSGBATCH_SIZE && + (entry = rhashtable_walk_next(ctx->iter)) && + !IS_ERR(entry); i++) { + struct p4tc_table_entry_value *value = + p4tc_table_entry_value(entry); + struct nlattr *count; + + if (!p4tc_ctrl_read_ok(value->permissions)) { + i--; + continue; + } + + count = nla_nest_start(skb, i + 1); + if (!count) { + rhashtable_walk_stop(ctx->iter); + goto table_put; + } + + ret = p4tc_tbl_entry_fill(skb, table, entry, + table->tbl_id, + P4TC_ENTITY_UNSPEC); + if (ret == 0) { + NL_SET_ERR_MSG(extack, + "Failed to fill notification attributes for table entry"); + goto walk_done; + } else if (ret == -ENOMEM) { + ret = 1; + nla_nest_cancel(skb, count); + rhashtable_walk_stop(ctx->iter); + goto table_put; + } + nla_nest_end(skb, count); + } + } while (entry == ERR_PTR(-EAGAIN)); + rhashtable_walk_stop(ctx->iter); + + if (!i) { + rhashtable_walk_exit(ctx->iter); + + ret = 0; + kfree(ctx->iter); + + goto table_put; + } + + if (!nl_path_attrs->pname_passed) + strscpy(nl_path_attrs->pname, pipeline->common.name, + P4TC_PIPELINE_NAMSIZ); + + if (!nl_path_attrs->ids[P4TC_PID_IDX]) + nl_path_attrs->ids[P4TC_PID_IDX] = pipeline->common.p_id; + + if (!nl_path_attrs->ids[P4TC_TBLID_IDX]) + nl_path_attrs->ids[P4TC_TBLID_IDX] = table->tbl_id; + + ret = skb->len; + + goto table_put; + +walk_done: + rhashtable_walk_stop(ctx->iter); + rhashtable_walk_exit(ctx->iter); + kfree(ctx->iter); + + nlmsg_trim(skb, b); + +table_put: + p4tc_table_entry_put_table(pipeline, table); + + return ret; +} + +int p4tc_tbl_entry_dumpit(struct net *net, struct sk_buff *skb, + struct netlink_callback *cb, + struct nlattr *arg, char *p_name) +{ + struct p4tc_path_nlattrs nl_path_attrs = {0}; + struct netlink_ext_ack *extack = cb->extack; + u32 portid = NETLINK_CB(cb->skb).portid; + const struct nlmsghdr *n = cb->nlh; + struct nlattr *tb[P4TC_MAX + 1]; + u32 ids[P4TC_PATH_MAX] = { 0 }; + struct p4tcmsg *t_new; + struct nlmsghdr *nlh; + struct nlattr *pnatt; + struct nlattr *root; + struct p4tcmsg *t; + u32 *arg_ids; + int ret; + + ret = nla_parse_nested(tb, P4TC_MAX, arg, p4tc_policy, extack); + if (ret < 0) + return ret; + + nlh = nlmsg_put(skb, portid, n->nlmsg_seq, RTM_P4TC_GET, sizeof(*t), + n->nlmsg_flags); + if (!nlh) + return -ENOSPC; + + t = (struct p4tcmsg *)nlmsg_data(n); + t_new = nlmsg_data(nlh); + t_new->pipeid = t->pipeid; + t_new->obj = t->obj; + + if (NL_REQ_ATTR_CHECK(extack, arg, tb, P4TC_PATH)) { + NL_SET_ERR_MSG(extack, "Must specify object path"); + return -EINVAL; + } + + pnatt = nla_reserve(skb, P4TC_ROOT_PNAME, P4TC_PIPELINE_NAMSIZ); + if (!pnatt) + return -ENOMEM; + + ids[P4TC_PID_IDX] = t_new->pipeid; + arg_ids = nla_data(tb[P4TC_PATH]); + memcpy(&ids[P4TC_TBLID_IDX], arg_ids, nla_len(tb[P4TC_PATH])); + nl_path_attrs.ids = ids; + + nl_path_attrs.pname = nla_data(pnatt); + if (!p_name) { + /* Filled up by the operation or forced failure */ + memset(nl_path_attrs.pname, 0, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = false; + } else { + strscpy(nl_path_attrs.pname, p_name, P4TC_PIPELINE_NAMSIZ); + nl_path_attrs.pname_passed = true; + } + + root = nla_nest_start(skb, P4TC_ROOT); + ret = p4tc_table_entry_dump(net, skb, tb[P4TC_PARAMS], &nl_path_attrs, + cb, extack); + if (ret <= 0) + goto out; + nla_nest_end(skb, root); + + if (nl_path_attrs.pname) { + if (nla_put_string(skb, P4TC_ROOT_PNAME, nl_path_attrs.pname)) { + ret = -1; + goto out; + } + } + + if (!t_new->pipeid) + t_new->pipeid = ids[P4TC_PID_IDX]; + + nlmsg_end(skb, nlh); + + return skb->len; + +out: + nlmsg_cancel(skb, nlh); + return ret; +} diff --git a/net/sched/p4tc/p4tc_tmpl_api.c b/net/sched/p4tc/p4tc_tmpl_api.c index 2fc4a0a54..dfeb00446 100644 --- a/net/sched/p4tc/p4tc_tmpl_api.c +++ b/net/sched/p4tc/p4tc_tmpl_api.c @@ -27,12 +27,12 @@ #include #include -static const struct nla_policy p4tc_root_policy[P4TC_ROOT_MAX + 1] = { +const struct nla_policy p4tc_root_policy[P4TC_ROOT_MAX + 1] = { [P4TC_ROOT] = { .type = NLA_NESTED }, [P4TC_ROOT_PNAME] = { .type = NLA_STRING, .len = P4TC_PIPELINE_NAMSIZ }, }; -static const struct nla_policy p4tc_policy[P4TC_MAX + 1] = { +const struct nla_policy p4tc_policy[P4TC_MAX + 1] = { [P4TC_PATH] = { .type = NLA_BINARY, .len = P4TC_PATH_MAX * sizeof(u32) }, [P4TC_PARAMS] = { .type = NLA_NESTED }, diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c index e50a1c1ff..da7902404 100644 --- a/security/selinux/nlmsgtab.c +++ b/security/selinux/nlmsgtab.c @@ -98,6 +98,10 @@ static const struct nlmsg_perm nlmsg_route_perms[] = { { RTM_DELP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, { RTM_GETP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_READ }, { RTM_UPDATEP4TEMPLATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, + { RTM_P4TC_CREATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, + { RTM_P4TC_DEL, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, + { RTM_P4TC_GET, NETLINK_ROUTE_SOCKET__NLMSG_READ }, + { RTM_P4TC_UPDATE, NETLINK_ROUTE_SOCKET__NLMSG_WRITE }, }; static const struct nlmsg_perm nlmsg_tcpdiag_perms[] = { @@ -181,7 +185,7 @@ int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm) * structures at the top of this file with the new mappings * before updating the BUILD_BUG_ON() macro! */ - BUILD_BUG_ON(RTM_MAX != (RTM_CREATEP4TEMPLATE + 3)); 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:29 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 14/15] p4tc: add set of P4TC table kfuncs Date: Fri, 1 Dec 2023 13:29:03 -0500 Message-Id: <20231201182904.532825-15-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org We add an initial set of kfuncs to allow interactions from eBPF programs to the P4TC domain. - bpf_p4tc_tbl_read: Used to lookup a table entry from a BPF program installed in TC. To find the table entry we take in an skb, the pipeline ID, the table ID, a key and a key size. We use the skb to get the network namespace structure where all the pipelines are stored. After that we use the pipeline ID and the table ID, to find the table. We then use the key to search for the entry. We return an entry on success and NULL on failure. - xdp_p4tc_tbl_read: Used to lookup a table entry from a BPF program installed in XDP. To find the table entry we take in an xdp_md, the pipeline ID, the table ID, a key and a key size. We use struct xdp_md to get the network namespace structure where all the pipelines are stored. After that we use the pipeline ID and the table ID, to find the table. We then use the key to search for the entry. We return an entry on success and NULL on failure. - bpf_p4tc_entry_create: Used to create a table entry from a BPF program installed in TC. To create the table entry we take an skb, the pipeline ID, the table ID, a key and its size, and an action which will be associated with the new entry. We return 0 on success and a negative errno on failure - xdp_p4tc_entry_create: Used to create a table entry from a BPF program installed in XDP. To create the table entry we take an xdp_md, the pipeline ID, the table ID, a key and its size, and an action which will be associated with the new entry. We return 0 on success and a negative errno on failure - bpf_p4tc_entry_create_on_miss: conforms to PNA "add on miss". First does a lookup using the passed key and upon a miss will add the entry to the table. We return 0 on success and a negative errno on failure - xdp_p4tc_entry_create_on_miss: conforms to PNA "add on miss". First does a lookup using the passed key and upon a miss will add the entry to the table. We return 0 on success and a negative errno on failure - bpf_p4tc_entry_update: Used to update a table entry from a BPF program installed in TC. To update the table entry we take an skb, the pipeline ID, the table ID, a key and its size, and an action which will be associated with the new entry. We return 0 on success and a negative errno on failure - xdp_p4tc_entry_update: Used to update a table entry from a BPF program installed in XDP. To update the table entry we take an xdp_md, the pipeline ID, the table ID, a key and its size, and an action which will be associated with the new entry. We return 0 on success and a negative errno on failure - bpf_p4tc_entry_delete: Used to delete a table entry from a BPF program installed in TC. To delete the table entry we take an skb, the pipeline ID, the table ID, a key and a key size. We return 0 on success and a negative errno on failure - xdp_p4tc_entry_delete: Used to delete a table entry from a BPF program installed in XDP. To delete the table entry we take an xdp_md, the pipeline ID, the table ID, a key and a key size. We return 0 on success and a negative errno on failure Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim --- include/linux/bitops.h | 1 + include/net/p4tc.h | 60 +++++- include/net/tc_act/p4tc.h | 24 +++ include/uapi/linux/p4tc.h | 2 + net/sched/p4tc/Makefile | 1 + net/sched/p4tc/p4tc_action.c | 70 ++++++- net/sched/p4tc/p4tc_bpf.c | 338 ++++++++++++++++++++++++++++++++ net/sched/p4tc/p4tc_pipeline.c | 47 ++++- net/sched/p4tc/p4tc_table.c | 8 + net/sched/p4tc/p4tc_tbl_entry.c | 301 +++++++++++++++++++++++++++- net/sched/p4tc/p4tc_tmpl_api.c | 4 + 11 files changed, 843 insertions(+), 13 deletions(-) create mode 100644 net/sched/p4tc/p4tc_bpf.c diff --git a/include/linux/bitops.h b/include/linux/bitops.h index 2ba557e06..290c2399a 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -19,6 +19,7 @@ #define BITS_TO_LONGS(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(long)) #define BITS_TO_U64(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u64)) #define BITS_TO_U32(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u32)) +#define BITS_TO_U16(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(u16)) #define BITS_TO_BYTES(nr) __KERNEL_DIV_ROUND_UP(nr, BITS_PER_TYPE(char)) extern unsigned int __sw_hweight8(unsigned int w); diff --git a/include/net/p4tc.h b/include/net/p4tc.h index d600e8655..3557e3b8b 100644 --- a/include/net/p4tc.h +++ b/include/net/p4tc.h @@ -91,8 +91,28 @@ struct p4tc_pipeline { u8 p_state; }; +#define P4TC_PIPELINE_MAX_ARRAY 32 + +struct p4tc_tbl_cache_key { + u32 pipeid; + u32 tblid; +}; + +extern const struct rhashtable_params tbl_cache_ht_params; + +struct p4tc_table; + +int p4tc_tbl_cache_insert(struct net *net, u32 pipeid, + struct p4tc_table *table); +void p4tc_tbl_cache_remove(struct net *net, struct p4tc_table *table); +struct p4tc_table *p4tc_tbl_cache_lookup(struct net *net, u32 pipeid, + u32 tblid); + +#define P4TC_TBLS_CACHE_SIZE 32 + struct p4tc_pipeline_net { - struct idr pipeline_idr; + struct list_head tbls_cache[P4TC_TBLS_CACHE_SIZE]; + struct idr pipeline_idr; }; static inline bool p4tc_tmpl_msg_is_update(struct nlmsghdr *n) @@ -220,6 +240,7 @@ struct p4tc_table_perm { struct p4tc_table { struct p4tc_template_common common; + struct list_head tbl_cache_node; struct list_head tbl_acts_list; struct idr tbl_masks_idr; struct ida tbl_prio_idr; @@ -314,6 +335,17 @@ extern const struct p4tc_template_ops p4tc_act_ops; extern const struct rhashtable_params entry_hlt_params; +struct p4tc_table_entry_act_bpf_params { + u32 pipeid; + u32 tblid; +}; + +struct p4tc_table_entry_create_bpf_params { + u64 aging_ms; + u32 pipeid; + u32 tblid; +}; + struct p4tc_table_entry; struct p4tc_table_entry_work { struct work_struct work; @@ -364,6 +396,13 @@ struct p4tc_table_entry { /* fallthrough: key data + value */ }; +struct p4tc_entry_key_bpf { + void *key; + void *mask; + u32 key_sz; + u32 mask_sz; +}; + #define P4TC_KEYSZ_BYTES(bits) (round_up(BITS_TO_BYTES(bits), 8)) #define P4TC_ENTRY_KEY_OFFSET (offsetof(struct p4tc_table_entry_key, fa_key)) @@ -392,6 +431,25 @@ struct p4tc_table_entry * p4tc_table_entry_lookup_direct(struct p4tc_table *table, struct p4tc_table_entry_key *key); +struct p4tc_table_entry_act_bpf * +p4tc_table_entry_create_act_bpf(struct tc_action *action, + struct netlink_ext_ack *extack); +int register_p4tc_tbl_bpf(void); +int p4tc_table_entry_create_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_act_bpf *act_bpf, + u64 aging_ms); +int p4tc_table_entry_update_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_act_bpf *act_bpf, + u64 aging_ms); + +int p4tc_table_entry_del_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key); + static inline int p4tc_action_init(struct net *net, struct nlattr *nla, struct tc_action *acts[], u32 pipeid, u32 flags, struct netlink_ext_ack *extack) diff --git a/include/net/tc_act/p4tc.h b/include/net/tc_act/p4tc.h index 6447fe5ce..ca925d112 100644 --- a/include/net/tc_act/p4tc.h +++ b/include/net/tc_act/p4tc.h @@ -14,10 +14,23 @@ struct tcf_p4act_params { u32 tot_params_sz; }; +#define P4TC_MAX_PARAM_DATA_SIZE 124 + +struct p4tc_table_entry_act_bpf { + u32 act_id; + u8 params[P4TC_MAX_PARAM_DATA_SIZE]; +} __packed; + +struct p4tc_table_entry_act_bpf_kern { + struct rcu_head rcu; + struct p4tc_table_entry_act_bpf act_bpf; +}; + struct tcf_p4act { struct tc_action common; /* Params IDR reference passed during runtime */ struct tcf_p4act_params __rcu *params; + struct p4tc_table_entry_act_bpf_kern __rcu *act_bpf; u32 p_id; u32 act_id; struct list_head node; @@ -25,4 +38,15 @@ struct tcf_p4act { #define to_p4act(a) ((struct tcf_p4act *)a) +static inline struct p4tc_table_entry_act_bpf * +p4tc_table_entry_act_bpf(struct tc_action *action) +{ + struct p4tc_table_entry_act_bpf_kern *act_bpf; + struct tcf_p4act *p4act = to_p4act(action); + + act_bpf = rcu_dereference(p4act->act_bpf); + + return &act_bpf->act_bpf; +} + #endif /* __NET_TC_ACT_P4_H */ diff --git a/include/uapi/linux/p4tc.h b/include/uapi/linux/p4tc.h index 55fc660c9..8815e6422 100644 --- a/include/uapi/linux/p4tc.h +++ b/include/uapi/linux/p4tc.h @@ -19,6 +19,8 @@ struct p4tcmsg { #define P4TC_MINTABLES_COUNT 0 #define P4TC_MSGBATCH_SIZE 16 +#define P4TC_ACT_MAX_NUM_PARAMS P4TC_MSGBATCH_SIZE + #define P4TC_MAX_KEYSZ 512 #define P4TC_DEFAULT_NUM_PREALLOC 16 diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index 921909ac4..3fed9a853 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -3,3 +3,4 @@ obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o \ p4tc_action.o p4tc_table.o p4tc_tbl_entry.o \ p4tc_runtime_api.o +obj-$(CONFIG_DEBUG_INFO_BTF) += p4tc_bpf.o diff --git a/net/sched/p4tc/p4tc_action.c b/net/sched/p4tc/p4tc_action.c index ac35874b6..bd51b07ce 100644 --- a/net/sched/p4tc/p4tc_action.c +++ b/net/sched/p4tc/p4tc_action.c @@ -270,29 +270,84 @@ static void p4a_runt_parms_destroy_rcu(struct rcu_head *head) p4a_runt_parms_destroy(params); } +static struct p4tc_table_entry_act_bpf_kern * +p4a_runt_create_bpf(struct tcf_p4act *p4act, + struct tcf_p4act_params *act_params, + struct netlink_ext_ack *extack) +{ + struct p4tc_act_param *params[P4TC_ACT_MAX_NUM_PARAMS]; + struct p4tc_table_entry_act_bpf_kern *act_bpf; + struct p4tc_act_param *param; + unsigned long param_id, tmp; + size_t tot_params_sz = 0; + u8 *params_cursor; + int nparams = 0; + int i; + + act_bpf = kzalloc(sizeof(*act_bpf), GFP_KERNEL); + if (!act_bpf) + return ERR_PTR(-ENOMEM); + + idr_for_each_entry_ul(&act_params->params_idr, param, tmp, param_id) { + const struct p4tc_type *type = param->type; + + if (tot_params_sz > P4TC_MAX_PARAM_DATA_SIZE) { + NL_SET_ERR_MSG(extack, + "Maximum parameter byte size reached"); + kfree(act_bpf); + return ERR_PTR(-EINVAL); + } + + tot_params_sz += BITS_TO_BYTES(type->container_bitsz); + params[nparams++] = param; + } + + act_bpf->act_bpf.act_id = p4act->act_id; + params_cursor = act_bpf->act_bpf.params; + for (i = 0; i < nparams; i++) { + u32 type_bytesz; + + param = params[i]; + type_bytesz = BITS_TO_BYTES(param->type->container_bitsz); + memcpy(params_cursor, param->value, type_bytesz); + params_cursor += type_bytesz; + } + + return act_bpf; +} + static int __p4a_runt_init_set(struct p4tc_act *act, struct tc_action **a, struct tcf_p4act_params *params, struct tcf_chain *goto_ch, struct tc_act_p4 *parm, bool exists, struct netlink_ext_ack *extack) { + struct p4tc_table_entry_act_bpf_kern *act_bpf = NULL, *act_bpf_old; struct tcf_p4act_params *params_old; struct tcf_p4act *p; p = to_p4act(*a); + if (!((*a)->tcfa_flags & TCA_ACT_FLAGS_UNREFERENCED)) { + act_bpf = p4a_runt_create_bpf(p, params, extack); + if (IS_ERR(act_bpf)) + return PTR_ERR(act_bpf); + } + /* sparse is fooled by lock under conditionals. - * To avoid false positives, we are repeating these two lines in both + * To avoid false positives, we are repeating these 3 lines in both * branches of the if-statement */ if (exists) { spin_lock_bh(&p->tcf_lock); goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); params_old = rcu_replace_pointer(p->params, params, 1); + act_bpf_old = rcu_replace_pointer(p->act_bpf, act_bpf, 1); spin_unlock_bh(&p->tcf_lock); } else { goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); params_old = rcu_replace_pointer(p->params, params, 1); + act_bpf_old = rcu_replace_pointer(p->act_bpf, act_bpf, 1); } if (goto_ch) @@ -301,6 +356,9 @@ static int __p4a_runt_init_set(struct p4tc_act *act, struct tc_action **a, if (params_old) call_rcu(¶ms_old->rcu, p4a_runt_parms_destroy_rcu); + if (act_bpf_old) + kfree_rcu(act_bpf_old, rcu); + return 0; } @@ -493,6 +551,7 @@ void p4a_runt_init_flags(struct tcf_p4act *p4act) static void __p4a_runt_prealloc_put(struct p4tc_act *act, struct tcf_p4act *p4act) { + struct p4tc_table_entry_act_bpf_kern *act_bpf_old; struct tcf_p4act_params *p4act_params; struct p4tc_act_param *param; unsigned long param_id, tmp; @@ -511,6 +570,10 @@ static void __p4a_runt_prealloc_put(struct p4tc_act *act, p4act->common.tcfa_flags |= TCA_ACT_FLAGS_UNREFERENCED; spin_unlock_bh(&p4act->tcf_lock); + act_bpf_old = rcu_replace_pointer(p4act->act_bpf, NULL, 1); + if (act_bpf_old) + kfree_rcu(act_bpf_old, rcu); + spin_lock_bh(&act->list_lock); list_add_tail(&p4act->node, &act->prealloc_list); spin_unlock_bh(&act->list_lock); @@ -1147,16 +1210,21 @@ static int p4a_runt_walker(struct net *net, struct sk_buff *skb, static void p4a_runt_cleanup(struct tc_action *a) { struct tc_action_ops *ops = (struct tc_action_ops *)a->ops; + struct p4tc_table_entry_act_bpf_kern *act_bpf; struct tcf_p4act *m = to_p4act(a); struct tcf_p4act_params *params; params = rcu_dereference_protected(m->params, 1); + act_bpf = rcu_dereference_protected(m->act_bpf, 1); if (refcount_read(&ops->p4_ref) > 1) refcount_dec(&ops->p4_ref); if (params) call_rcu(¶ms->rcu, p4a_runt_parms_destroy_rcu); + + if (act_bpf) + kfree_rcu(act_bpf, rcu); } static void p4a_runt_net_exit(struct tc_action_net *tn) diff --git a/net/sched/p4tc/p4tc_bpf.c b/net/sched/p4tc/p4tc_bpf.c new file mode 100644 index 000000000..ba479f111 --- /dev/null +++ b/net/sched/p4tc/p4tc_bpf.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +BTF_ID_LIST(btf_p4tc_ids) +BTF_ID(struct, p4tc_table_entry_act_bpf) +BTF_ID(struct, p4tc_table_entry_act_bpf_params) +BTF_ID(struct, p4tc_table_entry_act_bpf) +BTF_ID(struct, p4tc_table_entry_create_bpf_params) + +static struct p4tc_table_entry_act_bpf no_action_bpf = {}; + +static struct p4tc_table_entry_act_bpf * +__bpf_p4tc_tbl_read(struct net *caller_net, + struct p4tc_table_entry_act_bpf_params *params, + void *key, const u32 key__sz) +{ + struct p4tc_table_entry_key *entry_key = key; + struct p4tc_table_defact *defact_hit; + struct p4tc_table_entry_value *value; + struct p4tc_table_entry *entry; + struct p4tc_table *table; + u32 pipeid; + u32 tblid; + + if (!params || !key) + return NULL; + + if (key__sz <= P4TC_ENTRY_KEY_OFFSET) + return NULL; + + pipeid = params->pipeid; + tblid = params->tblid; + + entry_key->keysz = (key__sz - P4TC_ENTRY_KEY_OFFSET) << 3; + + table = p4tc_tbl_cache_lookup(caller_net, pipeid, tblid); + if (!table) + return NULL; + + entry = p4tc_table_entry_lookup_direct(table, entry_key); + if (!entry) { + struct p4tc_table_defact *defact; + + defact = rcu_dereference(table->tbl_default_missact); + return defact ? + p4tc_table_entry_act_bpf(defact->default_acts[0]) : NULL; + } + + value = p4tc_table_entry_value(entry); + + if (value->acts) + return p4tc_table_entry_act_bpf(value->acts[0]); + + defact_hit = rcu_dereference(table->tbl_default_hitact); + return defact_hit ? + p4tc_table_entry_act_bpf(defact_hit->default_acts[0]) : + &no_action_bpf; +} + +__bpf_kfunc static struct p4tc_table_entry_act_bpf * +bpf_p4tc_tbl_read(struct __sk_buff *skb_ctx, + struct p4tc_table_entry_act_bpf_params *params, + void *key, const u32 key__sz) +{ + struct sk_buff *skb = (struct sk_buff *)skb_ctx; + struct net *caller_net; + + caller_net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); + + return __bpf_p4tc_tbl_read(caller_net, params, key, key__sz); +} + +__bpf_kfunc static struct p4tc_table_entry_act_bpf * +xdp_p4tc_tbl_read(struct xdp_md *xdp_ctx, + struct p4tc_table_entry_act_bpf_params *params, + void *key, const u32 key__sz) +{ + struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; + struct net *caller_net; + + caller_net = dev_net(ctx->rxq->dev); + + return __bpf_p4tc_tbl_read(caller_net, params, key, key__sz); +} + +static int +__bpf_p4tc_entry_create(struct net *net, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct p4tc_table_entry_key *entry_key = key; + struct p4tc_pipeline *pipeline; + struct p4tc_table *table; + + if (!params || !key) + return -EINVAL; + + if (key__sz <= P4TC_ENTRY_KEY_OFFSET) + return -EINVAL; + + pipeline = p4tc_pipeline_find_byid(net, params->pipeid); + if (!pipeline) + return -ENOENT; + + table = p4tc_tbl_cache_lookup(net, params->pipeid, params->tblid); + if (!table) + return -ENOENT; + + entry_key->keysz = (key__sz - P4TC_ENTRY_KEY_OFFSET) << 3; + + return p4tc_table_entry_create_bpf(pipeline, table, entry_key, act_bpf, + params->aging_ms); +} + +__bpf_kfunc static int +bpf_p4tc_entry_create(struct __sk_buff *skb_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct sk_buff *skb = (struct sk_buff *)skb_ctx; + struct net *net; + + net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); + + return __bpf_p4tc_entry_create(net, params, key, key__sz, act_bpf); +} + +__bpf_kfunc static int +xdp_p4tc_entry_create(struct xdp_md *xdp_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; + struct net *net; + + net = dev_net(ctx->rxq->dev); + + return __bpf_p4tc_entry_create(net, params, key, key__sz, act_bpf); +} + +__bpf_kfunc static int +bpf_p4tc_entry_create_on_miss(struct __sk_buff *skb_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct sk_buff *skb = (struct sk_buff *)skb_ctx; + struct net *net; + + net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); + + return __bpf_p4tc_entry_create(net, params, key, key__sz, act_bpf); +} + +__bpf_kfunc static int +xdp_p4tc_entry_create_on_miss(struct xdp_md *xdp_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; + struct net *net; + + net = dev_net(ctx->rxq->dev); + + return __bpf_p4tc_entry_create(net, params, key, key__sz, act_bpf); +} + +static int +__bpf_p4tc_entry_update(struct net *net, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct p4tc_table_entry_key *entry_key = key; + struct p4tc_pipeline *pipeline; + struct p4tc_table *table; + + if (!params || !key) + return -EINVAL; + + if (key__sz <= P4TC_ENTRY_KEY_OFFSET) + return -EINVAL; + + pipeline = p4tc_pipeline_find_byid(net, params->pipeid); + if (!pipeline) + return -ENOENT; + + table = p4tc_tbl_cache_lookup(net, params->pipeid, params->tblid); + if (!table) + return -ENOENT; + + entry_key->keysz = (key__sz - P4TC_ENTRY_KEY_OFFSET) << 3; + + return p4tc_table_entry_update_bpf(pipeline, table, entry_key, + act_bpf, params->aging_ms); +} + +__bpf_kfunc static int +bpf_p4tc_entry_update(struct __sk_buff *skb_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct sk_buff *skb = (struct sk_buff *)skb_ctx; + struct net *net; + + net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); + + return __bpf_p4tc_entry_update(net, params, key, key__sz, act_bpf); +} + +__bpf_kfunc static int +xdp_p4tc_entry_update(struct xdp_md *xdp_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz, + struct p4tc_table_entry_act_bpf *act_bpf) +{ + struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; + struct net *net; + + net = dev_net(ctx->rxq->dev); + + return __bpf_p4tc_entry_update(net, params, key, key__sz, act_bpf); +} + +static int +__bpf_p4tc_entry_delete(struct net *net, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz) +{ + struct p4tc_table_entry_key *entry_key = key; + struct p4tc_pipeline *pipeline; + struct p4tc_table *table; + + if (!params || !key) + return -EINVAL; + + if (key__sz <= P4TC_ENTRY_KEY_OFFSET) + return -EINVAL; + + pipeline = p4tc_pipeline_find_byid(net, params->pipeid); + if (!pipeline) + return -ENOENT; + + table = p4tc_tbl_cache_lookup(net, params->pipeid, params->tblid); + if (!table) + return -ENOENT; + + entry_key->keysz = (key__sz - P4TC_ENTRY_KEY_OFFSET) << 3; + + return p4tc_table_entry_del_bpf(pipeline, table, entry_key); +} + +__bpf_kfunc static int +bpf_p4tc_entry_delete(struct __sk_buff *skb_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz) +{ + struct sk_buff *skb = (struct sk_buff *)skb_ctx; + struct net *net; + + net = skb->dev ? dev_net(skb->dev) : sock_net(skb->sk); + + return __bpf_p4tc_entry_delete(net, params, key, key__sz); +} + +__bpf_kfunc static int +xdp_p4tc_entry_delete(struct xdp_md *xdp_ctx, + struct p4tc_table_entry_create_bpf_params *params, + void *key, const u32 key__sz) +{ + struct xdp_buff *ctx = (struct xdp_buff *)xdp_ctx; + struct net *net; + + net = dev_net(ctx->rxq->dev); + + return __bpf_p4tc_entry_delete(net, params, key, key__sz); +} + +BTF_SET8_START(p4tc_kfunc_check_tbl_set_skb) +BTF_ID_FLAGS(func, bpf_p4tc_tbl_read, KF_RET_NULL); +BTF_ID_FLAGS(func, bpf_p4tc_entry_create); +BTF_ID_FLAGS(func, bpf_p4tc_entry_create_on_miss); +BTF_ID_FLAGS(func, bpf_p4tc_entry_update); +BTF_ID_FLAGS(func, bpf_p4tc_entry_delete); +BTF_SET8_END(p4tc_kfunc_check_tbl_set_skb) + +static const struct btf_kfunc_id_set p4tc_kfunc_tbl_set_skb = { + .owner = THIS_MODULE, + .set = &p4tc_kfunc_check_tbl_set_skb, +}; + +BTF_SET8_START(p4tc_kfunc_check_tbl_set_xdp) +BTF_ID_FLAGS(func, xdp_p4tc_tbl_read, KF_RET_NULL); +BTF_ID_FLAGS(func, xdp_p4tc_entry_create); +BTF_ID_FLAGS(func, xdp_p4tc_entry_create_on_miss); +BTF_ID_FLAGS(func, xdp_p4tc_entry_update); +BTF_ID_FLAGS(func, xdp_p4tc_entry_delete); +BTF_SET8_END(p4tc_kfunc_check_tbl_set_xdp) + +static const struct btf_kfunc_id_set p4tc_kfunc_tbl_set_xdp = { + .owner = THIS_MODULE, + .set = &p4tc_kfunc_check_tbl_set_xdp, +}; + +int register_p4tc_tbl_bpf(void) +{ + int ret; + + ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, + &p4tc_kfunc_tbl_set_skb); + if (ret < 0) + return ret; + + /* There is no unregister_btf_kfunc_id_set function */ + return register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, + &p4tc_kfunc_tbl_set_xdp); +} diff --git a/net/sched/p4tc/p4tc_pipeline.c b/net/sched/p4tc/p4tc_pipeline.c index f7ea1bcae..a617b8333 100644 --- a/net/sched/p4tc/p4tc_pipeline.c +++ b/net/sched/p4tc/p4tc_pipeline.c @@ -37,6 +37,44 @@ static __net_init int pipeline_init_net(struct net *net) idr_init(&pipe_net->pipeline_idr); + for (int i = 0; i < P4TC_TBLS_CACHE_SIZE; i++) + INIT_LIST_HEAD(&pipe_net->tbls_cache[i]); + + return 0; +} + +static size_t p4tc_tbl_cache_hash(u32 pipeid, u32 tblid) +{ + return (pipeid + tblid) % P4TC_TBLS_CACHE_SIZE; +} + +struct p4tc_table *p4tc_tbl_cache_lookup(struct net *net, u32 pipeid, u32 tblid) +{ + size_t hash = p4tc_tbl_cache_hash(pipeid, tblid); + struct p4tc_pipeline_net *pipe_net; + struct p4tc_table *pos, *tmp; + struct net_generic *ng; + + /* RCU read lock is already being held */ + ng = rcu_dereference(net->gen); + pipe_net = ng->ptr[pipeline_net_id]; + + list_for_each_entry_safe(pos, tmp, &pipe_net->tbls_cache[hash], + tbl_cache_node) { + if (pos->common.p_id == pipeid && pos->tbl_id == tblid) + return pos; + } + + return NULL; +} + +int p4tc_tbl_cache_insert(struct net *net, u32 pipeid, struct p4tc_table *table) +{ + struct p4tc_pipeline_net *pipe_net = net_generic(net, pipeline_net_id); + size_t hash = p4tc_tbl_cache_hash(pipeid, table->tbl_id); + + list_add_tail(&table->tbl_cache_node, &pipe_net->tbls_cache[hash]); + return 0; } @@ -44,6 +82,11 @@ static int __p4tc_pipeline_put(struct p4tc_pipeline *pipeline, struct p4tc_template_common *template, struct netlink_ext_ack *extack); +void p4tc_tbl_cache_remove(struct net *net, struct p4tc_table *table) +{ + list_del(&table->tbl_cache_node); +} + static void __net_exit pipeline_exit_net(struct net *net) { struct p4tc_pipeline_net *pipe_net; @@ -152,8 +195,8 @@ static int __p4tc_pipeline_put(struct p4tc_pipeline *pipeline, return 0; } -static inline int pipeline_try_set_state_ready(struct p4tc_pipeline *pipeline, - struct netlink_ext_ack *extack) +static int pipeline_try_set_state_ready(struct p4tc_pipeline *pipeline, + struct netlink_ext_ack *extack) { int ret; diff --git a/net/sched/p4tc/p4tc_table.c b/net/sched/p4tc/p4tc_table.c index df3fd3eef..d3390034a 100644 --- a/net/sched/p4tc/p4tc_table.c +++ b/net/sched/p4tc/p4tc_table.c @@ -380,6 +380,7 @@ static int _p4tc_table_put(struct net *net, struct nlattr **tb, rhltable_free_and_destroy(&table->tbl_entries, p4tc_table_entry_destroy_hash, table); + p4tc_tbl_cache_remove(net, table); idr_destroy(&table->tbl_masks_idr); ida_destroy(&table->tbl_prio_idr); @@ -1143,6 +1144,10 @@ static struct p4tc_table *p4tc_table_create(struct net *net, struct nlattr **tb, goto defaultacts_destroy; } + ret = p4tc_tbl_cache_insert(net, pipeline->common.p_id, table); + if (ret < 0) + goto entries_hashtable_destroy; + pipeline->curr_tables += 1; table->common.ops = (struct p4tc_template_ops *)&p4tc_table_ops; @@ -1150,6 +1155,9 @@ static struct p4tc_table *p4tc_table_create(struct net *net, struct nlattr **tb, return table; +entries_hashtable_destroy: + rhltable_destroy(&table->tbl_entries); + defaultacts_destroy: p4tc_table_defact_destroy(def_params.default_hitact); p4tc_table_defact_destroy(def_params.default_missact); diff --git a/net/sched/p4tc/p4tc_tbl_entry.c b/net/sched/p4tc/p4tc_tbl_entry.c index ee1ecdf71..f4542d839 100644 --- a/net/sched/p4tc/p4tc_tbl_entry.c +++ b/net/sched/p4tc/p4tc_tbl_entry.c @@ -275,7 +275,8 @@ static int p4tca_table_get_entry_keys(struct sk_buff *skb, goto out_nlmsg_trim; gen_exact_mask(mask_value, key_sz_bytes); - if (nla_put(skb, P4TC_ENTRY_MASK_BLOB, key_sz_bytes, mask_value)) + if (nla_put(skb, P4TC_ENTRY_MASK_BLOB, key_sz_bytes, + mask_value)) goto out_nlmsg_trim; } else { key_sz_bytes = BITS_TO_BYTES(entry->key.keysz); @@ -431,7 +432,8 @@ p4tc_table_entry_mask_find_byvalue(struct p4tc_table *table, void *curr_mask_value = mask_cur->fa_value; void *mask_value = mask->fa_value; - if (memcmp(curr_mask_value, mask_value, mask_sz_bytes) == 0) + if (memcmp(curr_mask_value, mask_value, + mask_sz_bytes) == 0) return mask_cur; } } @@ -559,7 +561,9 @@ static int p4tc_table_lpm_mask_insert(struct p4tc_table *table, find_lpm_mask(table, mask_pos->fa_value); if (mask_value > array_mask_value) { - /* shift masks to the right (will keep invariant) */ + /* shift masks to the right (will keep + * invariant). + */ u32 tail = nmasks; while (tail > pos + 1) { @@ -941,7 +945,8 @@ static int p4tc_table_entry_get_table(struct net *net, } tbl_id = ids[P4TC_TBLID_IDX]; - tblname = tb[P4TC_ENTRY_TBLNAME] ? nla_data(tb[P4TC_ENTRY_TBLNAME]) : NULL; + tblname = tb[P4TC_ENTRY_TBLNAME] ? + nla_data(tb[P4TC_ENTRY_TBLNAME]) : NULL; *table = p4tc_table_find_get(*pipeline, tblname, tbl_id, extack); if (IS_ERR(*table)) { @@ -1064,6 +1069,44 @@ __must_hold(RCU) return 0; } +/* Internal function which will be called by the data path */ +static int __p4tc_table_entry_del(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_mask *mask, u32 prio) +{ + struct p4tc_table_entry *entry; + int ret; + + p4tc_table_entry_build_key(table, key, mask); + + entry = p4tc_entry_lookup(table, key, prio); + if (!entry) + return -ENOENT; + + ret = ___p4tc_table_entry_del(pipeline, table, entry, false); + + return ret; +} + +int p4tc_table_entry_del_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key) +{ + u8 __mask[sizeof(struct p4tc_table_entry_mask) + + BITS_TO_BYTES(P4TC_MAX_KEYSZ)] = { 0 }; + const u32 keysz_bytes = P4TC_KEYSZ_BYTES(table->tbl_keysz); + struct p4tc_table_entry_mask *mask = (void *)&__mask; + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + return -EINVAL; + + if (keysz_bytes != P4TC_KEYSZ_BYTES(key->keysz)) + return -EINVAL; + + return __p4tc_table_entry_del(pipeline, table, key, mask, 0); +} + static int p4tc_table_entry_gd(struct net *net, struct sk_buff *skb, bool del, u16 *permissions, struct nlattr *arg, struct p4tc_path_nlattrs *nl_path_attrs, @@ -1360,6 +1403,54 @@ static int p4tc_table_entry_flush(struct net *net, struct sk_buff *skb, return ret; } +static int +p4tc_table_tc_act_from_bpf_act(struct tcf_p4act *p4act, + struct p4tc_table_entry_value *value, + struct p4tc_table_entry_act_bpf *act_bpf) +__must_hold(RCU) +{ + struct p4tc_table_entry_act_bpf_kern *new_act_bpf; + struct tcf_p4act_params *p4act_params; + struct p4tc_act_param *param; + unsigned long param_id, tmp; + u8 *params_cursor; + int err; + + p4act_params = rcu_dereference(p4act->params); + /* Skip act_id */ + params_cursor = (u8 *)act_bpf + sizeof(act_bpf->act_id); + idr_for_each_entry_ul(&p4act_params->params_idr, param, tmp, param_id) { + const struct p4tc_type *type = param->type; + const u32 type_bytesz = BITS_TO_BYTES(type->container_bitsz); + + memcpy(param->value, params_cursor, type_bytesz); + params_cursor += type_bytesz; + } + + new_act_bpf = kzalloc(sizeof(*new_act_bpf), GFP_ATOMIC); + if (unlikely(!new_act_bpf)) + return -ENOMEM; + + value->acts = kcalloc(TCA_ACT_MAX_PRIO, sizeof(struct tc_action *), + GFP_ATOMIC); + if (unlikely(!value->acts)) { + err = -ENOMEM; + goto free_act_bpf; + } + + new_act_bpf->act_bpf = *act_bpf; + + rcu_assign_pointer(p4act->act_bpf, new_act_bpf); + value->num_acts = 1; + value->acts[0] = (struct tc_action *)p4act; + + return 0; + +free_act_bpf: + kfree(new_act_bpf); + return err; +} + static enum hrtimer_restart entry_timer_handle(struct hrtimer *timer) { struct p4tc_table_entry_value *value = @@ -1521,6 +1612,116 @@ __must_hold(RCU) return ret; } +struct p4tc_table_entry_create_state { + struct p4tc_act *act; + struct tcf_p4act *p4_act; + struct p4tc_table_entry *entry; + u64 aging_ms; + u16 permissions; +}; + +static int +p4tc_table_entry_init_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, u32 entry_key_sz, + struct p4tc_table_entry_act_bpf *act_bpf, + struct p4tc_table_entry_create_state *state) +{ + const u32 keysz_bytes = P4TC_KEYSZ_BYTES(table->tbl_keysz); + struct p4tc_table_entry_value *entry_value; + const u32 keysz_bits = table->tbl_keysz; + struct tcf_p4act *p4_act = NULL; + struct p4tc_table_entry *entry; + struct p4tc_act *act = NULL; + int err = -EINVAL; + u32 entrysz; + + if (table->tbl_type != P4TC_TABLE_TYPE_EXACT) + goto out; + + if (keysz_bytes != P4TC_KEYSZ_BYTES(entry_key_sz)) + goto out; + + if (atomic_read(&table->tbl_nelems) + 1 > table->tbl_max_entries) + goto out; + + if (act_bpf) { + act = p4a_tmpl_get(pipeline, NULL, act_bpf->act_id, NULL); + if (!act) { + err = -ENOENT; + goto out; + } + } + + entrysz = sizeof(*entry) + keysz_bytes + + sizeof(struct p4tc_table_entry_value); + + entry = kzalloc(entrysz, GFP_ATOMIC); + if (unlikely(!entry)) { + err = -ENOMEM; + goto act_put; + } + entry->key.keysz = keysz_bits; + + entry_value = p4tc_table_entry_value(entry); + entry_value->prio = p4tc_table_entry_exact_prio(); + entry_value->permissions = state->permissions; + entry_value->aging_ms = state->aging_ms; + + if (act) { + p4_act = p4a_runt_prealloc_get_next(act); + if (!p4_act) { + err = -ENOENT; + goto idr_rm; + } + + err = p4tc_table_tc_act_from_bpf_act(p4_act, entry_value, + act_bpf); + if (err < 0) + goto free_prealloc; + } + + state->act = act; + state->p4_act = p4_act; + state->entry = entry; + + return 0; + +free_prealloc: + if (p4_act) + p4a_runt_prealloc_put(act, p4_act); + +idr_rm: + p4tc_table_entry_free_prio(table, entry_value->prio); + + kfree(entry); + +act_put: + if (act) + p4tc_action_put_ref(act); +out: + return err; +} + +static void +p4tc_table_entry_create_state_put(struct p4tc_table *table, + struct p4tc_table_entry_create_state *state) +{ + struct p4tc_table_entry_value *value; + + if (state->act) + p4a_runt_prealloc_put(state->act, state->p4_act); + + value = p4tc_table_entry_value(state->entry); + p4tc_table_entry_free_prio(table, value->prio); + + kfree(value->acts); + + kfree(state->entry); + + if (state->act) + p4tc_action_put_ref(state->act); +} + /* Invoked from both control and data path */ static int __p4tc_table_entry_update(struct p4tc_pipeline *pipeline, struct p4tc_table *table, @@ -1659,6 +1860,93 @@ __must_hold(RCU) return ret; } +static u16 p4tc_table_entry_tbl_permcpy(const u16 tblperm) +{ + return p4tc_ctrl_perm_rm_create(p4tc_data_perm_rm_create(tblperm)); +} + +int p4tc_table_entry_create_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_act_bpf *act_bpf, + u64 aging_ms) +{ + u16 tblperm = rcu_dereference(table->tbl_permissions)->permissions; + u8 __mask[sizeof(struct p4tc_table_entry_mask) + + BITS_TO_BYTES(P4TC_MAX_KEYSZ)] = { 0 }; + struct p4tc_table_entry_mask *mask = (void *)&__mask; + struct p4tc_table_entry_create_state state = {0}; + struct p4tc_table_entry_value *value; + int err; + + state.aging_ms = aging_ms; + state.permissions = p4tc_table_entry_tbl_permcpy(tblperm); + err = p4tc_table_entry_init_bpf(pipeline, table, key->keysz, + act_bpf, &state); + if (err < 0) + return err; + p4tc_table_entry_assign_key_exact(&state.entry->key, key->fa_key); + + value = p4tc_table_entry_value(state.entry); + /* Entry is always dynamic when it comes from the data path */ + value->is_dyn = true; + + err = __p4tc_table_entry_create(pipeline, table, state.entry, mask, + P4TC_ENTITY_KERNEL, false); + if (err < 0) + goto put_state; + + refcount_set(&value->entries_ref, 1); + if (state.p4_act) + p4a_runt_init_flags(state.p4_act); + + return 0; + +put_state: + p4tc_table_entry_create_state_put(table, &state); + + return err; +} + +int p4tc_table_entry_update_bpf(struct p4tc_pipeline *pipeline, + struct p4tc_table *table, + struct p4tc_table_entry_key *key, + struct p4tc_table_entry_act_bpf *act_bpf, + u64 aging_ms) +{ + struct p4tc_table_entry_create_state state = {0}; + struct p4tc_table_entry_value *value; + int err; + + state.aging_ms = aging_ms; + state.permissions = P4TC_PERMISSIONS_UNINIT; + err = p4tc_table_entry_init_bpf(pipeline, table, key->keysz, act_bpf, + &state); + if (err < 0) + return err; + + p4tc_table_entry_assign_key_exact(&state.entry->key, key->fa_key); + + value = p4tc_table_entry_value(state.entry); + value->is_dyn = !!aging_ms; + err = __p4tc_table_entry_update(pipeline, table, state.entry, NULL, + P4TC_ENTITY_KERNEL, false); + + if (err < 0) + goto put_state; + + refcount_set(&value->entries_ref, 1); + if (state.p4_act) + p4a_runt_init_flags(state.p4_act); + + return 0; + +put_state: + p4tc_table_entry_create_state_put(table, &state); + + return err; +} + static bool p4tc_table_check_entry_act(struct p4tc_table *table, struct tc_action *entry_act) { @@ -1731,11 +2019,6 @@ update_tbl_attrs(struct net *net, struct p4tc_table *table, return err; } -static u16 p4tc_table_entry_tbl_permcpy(const u16 tblperm) -{ - return p4tc_ctrl_perm_rm_create(p4tc_data_perm_rm_create(tblperm)); -} - #define P4TC_TBL_ENTRY_CU_FLAG_CREATE 0x1 #define P4TC_TBL_ENTRY_CU_FLAG_UPDATE 0x2 #define P4TC_TBL_ENTRY_CU_FLAG_SET 0x4 diff --git a/net/sched/p4tc/p4tc_tmpl_api.c b/net/sched/p4tc/p4tc_tmpl_api.c index dfeb00446..ca80291d2 100644 --- a/net/sched/p4tc/p4tc_tmpl_api.c +++ b/net/sched/p4tc/p4tc_tmpl_api.c @@ -599,6 +599,10 @@ static int __init p4tc_template_init(void) op->init(); } +#if IS_ENABLED(CONFIG_DEBUG_INFO_BTF) + register_p4tc_tbl_bpf(); +#endif + return 0; } From patchwork Fri Dec 1 18:29:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jamal Hadi Salim X-Patchwork-Id: 13476271 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mojatatu-com.20230601.gappssmtp.com header.i=@mojatatu-com.20230601.gappssmtp.com header.b="Bv+cIoLg" Received: from mail-qk1-x72d.google.com (mail-qk1-x72d.google.com [IPv6:2607:f8b0:4864:20::72d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11B0C129 for ; 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[174.91.6.24]) by smtp.gmail.com with ESMTPSA id s28-20020a0cb31c000000b0067a364eea86sm1702536qve.142.2023.12.01.10.29.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 10:29:30 -0800 (PST) From: Jamal Hadi Salim To: netdev@vger.kernel.org Cc: deb.chatterjee@intel.com, anjali.singhai@intel.com, namrata.limaye@intel.com, mleitner@redhat.com, Mahesh.Shirshyad@amd.com, tomasz.osinski@intel.com, jiri@resnulli.us, xiyou.wangcong@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, vladbu@nvidia.com, horms@kernel.org, khalidm@nvidia.com, toke@redhat.com, daniel@iogearbox.net, bpf@vger.kernel.org Subject: [PATCH net-next v9 15/15] p4tc: add P4 classifier Date: Fri, 1 Dec 2023 13:29:04 -0500 Message-Id: <20231201182904.532825-16-jhs@mojatatu.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231201182904.532825-1-jhs@mojatatu.com> References: <20231201182904.532825-1-jhs@mojatatu.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Introduce P4 tc classifier. A tc filter instantiated on this classifier is used to bind a P4 pipeline to one or more netdev ports. To use P4 classifier you must specify a pipeline name that will be associated to this filter, a s/w parser and datapath ebpf program. The pipeline must have already been created via a template. For example, if we were to add a filter to ingress of network interface device $P0 and associate it to P4 pipeline simple_l3 we'd issue the following command: tc filter add dev $P0 parent ffff: protocol all prio 6 p4 pname simple_l3 \ action bpf obj $PARSER.o section prog/tc-parser \ action bpf obj $PROGNAME.o section prog/tc-ingress $PROGNAME.o and $PARSER.o is a compilation of the eBPF programs generated by the P4 compiler and will be the representation of the P4 program. Note that filter understands that $PARSER.o is a parser to be loaded at the tc level. The datapath program is merely an eBPF action. Note we do support a distinct way of loading the parser as opposed to making it be an action, the above example would be: tc filter add dev $P0 parent ffff: protocol all prio 6 p4 pname simple_l3 \ prog type tc obj $PARSER.o ... \ action bpf obj $PROGNAME.o section prog/tc-ingress We support two types of loadings of these initial programs in the pipeline and differentiate between what gets loaded at tc vs xdp by using syntax of either "prog type tc obj" or "prog type xdp obj" For XDP: tc filter add dev $P0 ingress protocol all prio 1 p4 pname simple_l3 \ prog type xdp obj $PARSER.o section parser/xdp \ pinned_link /sys/fs/bpf/mylink \ action bpf obj $PROGNAME.o section prog/tc-ingress The theory of operations is as follows: ================================1. PARSING================================ The packet first encounters the parser. The parser is implemented in ebpf residing either at the TC or XDP level. The parsed header values are stored in a shared eBPF map. When the parser runs at XDP level, we load it into XDP using tc filter command and pin it to a file. =============================2. ACTIONS============================= In the above example, the P4 program (minus the parser) is encoded in an action($PROGNAME.o). It should be noted that classical tc actions continue to work: IOW, someone could decide to add a mirred action to mirror all packets after or before the ebpf action. tc filter add dev $P0 parent ffff: protocol all prio 6 p4 pname simple_l3 \ prog type tc obj $PARSER.o section parser/tc-ingress \ action bpf obj $PROGNAME.o section prog/tc-ingress \ action mirred egress mirror index 1 dev $P1 \ action bpf obj $ANOTHERPROG.o section mysect/section-1 It should also be noted that it is feasible to split some of the ingress datapath into XDP first and more into TC later (as was shown above for example where the parser runs at XDP level). YMMV. Co-developed-by: Victor Nogueira Signed-off-by: Victor Nogueira Co-developed-by: Pedro Tammela Signed-off-by: Pedro Tammela Signed-off-by: Jamal Hadi Salim Nacked-by: Daniel Borkmann --- include/uapi/linux/pkt_cls.h | 18 ++ net/sched/Kconfig | 12 + net/sched/Makefile | 1 + net/sched/cls_p4.c | 447 +++++++++++++++++++++++++++++++++++ net/sched/p4tc/Makefile | 4 +- net/sched/p4tc/trace.c | 10 + net/sched/p4tc/trace.h | 44 ++++ 7 files changed, 535 insertions(+), 1 deletion(-) create mode 100644 net/sched/cls_p4.c create mode 100644 net/sched/p4tc/trace.c create mode 100644 net/sched/p4tc/trace.h diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h index 75bf73742..b70ba4647 100644 --- a/include/uapi/linux/pkt_cls.h +++ b/include/uapi/linux/pkt_cls.h @@ -739,6 +739,24 @@ enum { #define TCA_MATCHALL_MAX (__TCA_MATCHALL_MAX - 1) +/* P4 classifier */ + +enum { + TCA_P4_UNSPEC, + TCA_P4_CLASSID, + TCA_P4_ACT, + TCA_P4_PNAME, + TCA_P4_PIPEID, + TCA_P4_PROG_FD, + TCA_P4_PROG_NAME, + TCA_P4_PROG_TYPE, + TCA_P4_PROG_ID, + TCA_P4_PAD, + __TCA_P4_MAX, +}; + +#define TCA_P4_MAX (__TCA_P4_MAX - 1) + /* Extended Matches */ struct tcf_ematch_tree_hdr { diff --git a/net/sched/Kconfig b/net/sched/Kconfig index df6d5e15f..dbfe5ceef 100644 --- a/net/sched/Kconfig +++ b/net/sched/Kconfig @@ -565,6 +565,18 @@ config NET_CLS_MATCHALL To compile this code as a module, choose M here: the module will be called cls_matchall. +config NET_CLS_P4 + tristate "P4 classifier" + select NET_CLS + select NET_P4_TC + help + If you say Y here, you will be able to bind a P4 pipeline + program. You will need to install a P4 template representing the + program successfully to use this feature. + + To compile this code as a module, choose M here: the module will + be called cls_p4. + config NET_EMATCH bool "Extended Matches" select NET_CLS diff --git a/net/sched/Makefile b/net/sched/Makefile index 937b8f8a9..15bd59ae3 100644 --- a/net/sched/Makefile +++ b/net/sched/Makefile @@ -73,6 +73,7 @@ obj-$(CONFIG_NET_CLS_CGROUP) += cls_cgroup.o obj-$(CONFIG_NET_CLS_BPF) += cls_bpf.o obj-$(CONFIG_NET_CLS_FLOWER) += cls_flower.o obj-$(CONFIG_NET_CLS_MATCHALL) += cls_matchall.o +obj-$(CONFIG_NET_CLS_P4) += cls_p4.o obj-$(CONFIG_NET_EMATCH) += ematch.o obj-$(CONFIG_NET_EMATCH_CMP) += em_cmp.o obj-$(CONFIG_NET_EMATCH_NBYTE) += em_nbyte.o diff --git a/net/sched/cls_p4.c b/net/sched/cls_p4.c new file mode 100644 index 000000000..baa0bfe84 --- /dev/null +++ b/net/sched/cls_p4.c @@ -0,0 +1,447 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/cls_p4.c - P4 Classifier + * Copyright (c) 2022-2023, Mojatatu Networks + * Copyright (c) 2022-2023, Intel Corporation. + * Authors: Jamal Hadi Salim + * Victor Nogueira + * Pedro Tammela + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +#include "p4tc/trace.h" + +#define CLS_P4_PROG_NAME_LEN 256 + +struct p4tc_bpf_prog { + struct bpf_prog *p4_prog; + const char *p4_prog_name; +}; + +struct cls_p4_head { + struct tcf_exts exts; + struct tcf_result res; + struct rcu_work rwork; + struct p4tc_pipeline *pipeline; + struct p4tc_bpf_prog *prog; + u32 handle; +}; + +static int p4_classify(struct sk_buff *skb, const struct tcf_proto *tp, + struct tcf_result *res) +{ + struct cls_p4_head *head = rcu_dereference_bh(tp->root); + bool at_ingress = skb_at_tc_ingress(skb); + + if (unlikely(!head)) { + pr_err("P4 classifier not found\n"); + return -1; + } + + /* head->prog represents the eBPF program that will be first executed by + * the data plane. It may or may not exist. In addition to head->prog, + * we'll have another eBPF program that will execute after this one in + * the form of a filter action (head->exts). + * head->prog->p4_prog_type == BPf_PROG_TYPE_SCHED_ACT means this + * program executes in TC P4 filter. + * head->prog->p4_prog_type == BPf_PROG_TYPE_SCHED_XDP means this + * program was loaded in XDP. + */ + if (head->prog) { + int rc = TC_ACT_PIPE; + + /* If eBPF program is loaded into TC */ + if (head->prog->p4_prog->type == BPF_PROG_TYPE_SCHED_ACT) { + if (at_ingress) { + /* It is safe to push/pull even if skb_shared() */ + __skb_push(skb, skb->mac_len); + bpf_compute_data_pointers(skb); + rc = bpf_prog_run(head->prog->p4_prog, + skb); + __skb_pull(skb, skb->mac_len); + } else { + bpf_compute_data_pointers(skb); + rc = bpf_prog_run(head->prog->p4_prog, + skb); + } + } + + if (rc != TC_ACT_PIPE) + return rc; + } + + trace_p4_classify(skb, head->pipeline); + + *res = head->res; + + return tcf_exts_exec(skb, &head->exts, res); +} + +static int p4_init(struct tcf_proto *tp) +{ + return 0; +} + +static void p4_bpf_prog_destroy(struct p4tc_bpf_prog *prog) +{ + bpf_prog_put(prog->p4_prog); + kfree(prog->p4_prog_name); + kfree(prog); +} + +static void __p4_destroy(struct cls_p4_head *head) +{ + tcf_exts_destroy(&head->exts); + tcf_exts_put_net(&head->exts); + if (head->prog) + p4_bpf_prog_destroy(head->prog); + p4tc_pipeline_put(head->pipeline); + kfree(head); +} + +static void p4_destroy_work(struct work_struct *work) +{ + struct cls_p4_head *head = + container_of(to_rcu_work(work), struct cls_p4_head, rwork); + + rtnl_lock(); + __p4_destroy(head); + rtnl_unlock(); +} + +static void p4_destroy(struct tcf_proto *tp, bool rtnl_held, + struct netlink_ext_ack *extack) +{ + struct cls_p4_head *head = rtnl_dereference(tp->root); + + if (!head) + return; + + tcf_unbind_filter(tp, &head->res); + + if (tcf_exts_get_net(&head->exts)) + tcf_queue_work(&head->rwork, p4_destroy_work); + else + __p4_destroy(head); +} + +static void *p4_get(struct tcf_proto *tp, u32 handle) +{ + struct cls_p4_head *head = rtnl_dereference(tp->root); + + if (head && head->handle == handle) + return head; + + return NULL; +} + +static const struct nla_policy p4_policy[TCA_P4_MAX + 1] = { + [TCA_P4_UNSPEC] = { .type = NLA_UNSPEC }, + [TCA_P4_CLASSID] = { .type = NLA_U32 }, + [TCA_P4_ACT] = { .type = NLA_NESTED }, + [TCA_P4_PNAME] = { .type = NLA_STRING, .len = P4TC_PIPELINE_NAMSIZ }, + [TCA_P4_PIPEID] = { .type = NLA_U32 }, + [TCA_P4_PROG_FD] = { .type = NLA_U32 }, + [TCA_P4_PROG_NAME] = { .type = NLA_STRING, + .len = CLS_P4_PROG_NAME_LEN }, + [TCA_P4_PROG_TYPE] = { .type = NLA_U32 }, +}; + +static int cls_p4_prog_from_efd(struct nlattr **tb, + struct p4tc_bpf_prog *prog, u32 flags, + struct netlink_ext_ack *extack) +{ + struct bpf_prog *fp; + u32 prog_type; + char *name; + u32 bpf_fd; + + bpf_fd = nla_get_u32(tb[TCA_P4_PROG_FD]); + prog_type = nla_get_u32(tb[TCA_P4_PROG_TYPE]); + + if (prog_type != BPF_PROG_TYPE_XDP && + prog_type != BPF_PROG_TYPE_SCHED_ACT) { + NL_SET_ERR_MSG(extack, + "BPF prog type must be BPF_PROG_TYPE_SCHED_ACT or BPF_PROG_TYPE_XDP"); + return -EINVAL; + } + + fp = bpf_prog_get_type_dev(bpf_fd, prog_type, false); + if (IS_ERR(fp)) + return PTR_ERR(fp); + + name = nla_memdup(tb[TCA_P4_PROG_NAME], GFP_KERNEL); + if (!name) { + bpf_prog_put(fp); + return -ENOMEM; + } + + prog->p4_prog_name = name; + prog->p4_prog = fp; + + return 0; +} + +static int p4_set_parms(struct net *net, struct tcf_proto *tp, + struct cls_p4_head *head, unsigned long base, + struct nlattr **tb, struct nlattr *est, u32 flags, + struct netlink_ext_ack *extack) +{ + bool load_bpf_prog = tb[TCA_P4_PROG_NAME] && tb[TCA_P4_PROG_FD] && + tb[TCA_P4_PROG_TYPE]; + struct p4tc_bpf_prog *prog = NULL; + int err; + + err = tcf_exts_validate_ex(net, tp, tb, est, &head->exts, flags, 0, + extack); + if (err < 0) + return err; + + if (load_bpf_prog) { + prog = kzalloc(sizeof(*prog), GFP_KERNEL); + if (!prog) { + err = -ENOMEM; + goto exts_destroy; + } + + err = cls_p4_prog_from_efd(tb, prog, flags, extack); + if (err < 0) { + kfree(prog); + goto exts_destroy; + } + } + + if (tb[TCA_P4_CLASSID]) { + head->res.classid = nla_get_u32(tb[TCA_P4_CLASSID]); + tcf_bind_filter(tp, &head->res, base); + } + + if (load_bpf_prog) { + if (head->prog) { + pr_notice("cls_p4: Substituting old BPF program with id %u with new one with id %u\n", + head->prog->p4_prog->aux->id, prog->p4_prog->aux->id); + p4_bpf_prog_destroy(head->prog); + } + head->prog = prog; + } + + return 0; + +exts_destroy: + tcf_exts_destroy(&head->exts); + return err; +} + +static int p4_change(struct net *net, struct sk_buff *in_skb, + struct tcf_proto *tp, unsigned long base, u32 handle, + struct nlattr **tca, void **arg, u32 flags, + struct netlink_ext_ack *extack) +{ + struct cls_p4_head *head = rtnl_dereference(tp->root); + struct p4tc_pipeline *pipeline = NULL; + struct nlattr *tb[TCA_P4_MAX + 1]; + struct cls_p4_head *new_cls; + char *pname = NULL; + u32 pipeid = 0; + int err; + + if (!tca[TCA_OPTIONS]) { + NL_SET_ERR_MSG(extack, "Must provide pipeline options"); + return -EINVAL; + } + + if (head) + return -EEXIST; + + err = nla_parse_nested(tb, TCA_P4_MAX, tca[TCA_OPTIONS], p4_policy, + extack); + if (err < 0) + return err; + + if (tb[TCA_P4_PNAME]) + pname = nla_data(tb[TCA_P4_PNAME]); + + if (tb[TCA_P4_PIPEID]) + pipeid = nla_get_u32(tb[TCA_P4_PIPEID]); + + pipeline = p4tc_pipeline_find_get(net, pname, pipeid, extack); + if (IS_ERR(pipeline)) + return PTR_ERR(pipeline); + + if (!p4tc_pipeline_sealed(pipeline)) { + err = -EINVAL; + NL_SET_ERR_MSG(extack, "Pipeline must be sealed before use"); + goto pipeline_put; + } + + new_cls = kzalloc(sizeof(*new_cls), GFP_KERNEL); + if (!new_cls) { + err = -ENOMEM; + goto pipeline_put; + } + + err = tcf_exts_init(&new_cls->exts, net, TCA_P4_ACT, 0); + if (err) + goto err_exts_init; + + if (!handle) + handle = 1; + + new_cls->handle = handle; + + err = p4_set_parms(net, tp, new_cls, base, tb, tca[TCA_RATE], flags, + extack); + if (err) + goto err_set_parms; + + new_cls->pipeline = pipeline; + *arg = head; + rcu_assign_pointer(tp->root, new_cls); + return 0; + +err_set_parms: + tcf_exts_destroy(&new_cls->exts); +err_exts_init: + kfree(new_cls); +pipeline_put: + p4tc_pipeline_put(pipeline); + return err; +} + +static int p4_delete(struct tcf_proto *tp, void *arg, bool *last, + bool rtnl_held, struct netlink_ext_ack *extack) +{ + *last = true; + return 0; +} + +static void p4_walk(struct tcf_proto *tp, struct tcf_walker *arg, + bool rtnl_held) +{ + struct cls_p4_head *head = rtnl_dereference(tp->root); + + if (arg->count < arg->skip) + goto skip; + + if (!head) + return; + if (arg->fn(tp, head, arg) < 0) + arg->stop = 1; +skip: + arg->count++; +} + +static int p4_prog_dump(struct sk_buff *skb, struct p4tc_bpf_prog *prog) +{ + unsigned char *b = nlmsg_get_pos(skb); + + if (nla_put_u32(skb, TCA_P4_PROG_ID, prog->p4_prog->aux->id)) + goto nla_put_failure; + + if (nla_put_string(skb, TCA_P4_PROG_NAME, prog->p4_prog_name)) + goto nla_put_failure; + + if (nla_put_u32(skb, TCA_P4_PROG_TYPE, prog->p4_prog->type)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static int p4_dump(struct net *net, struct tcf_proto *tp, void *fh, + struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) +{ + struct cls_p4_head *head = fh; + struct nlattr *nest; + + if (!head) + return skb->len; + + t->tcm_handle = head->handle; + + nest = nla_nest_start(skb, TCA_OPTIONS); + if (!nest) + goto nla_put_failure; + + if (nla_put_string(skb, TCA_P4_PNAME, head->pipeline->common.name)) + goto nla_put_failure; + + if (head->res.classid && + nla_put_u32(skb, TCA_P4_CLASSID, head->res.classid)) + goto nla_put_failure; + + if (head->prog && p4_prog_dump(skb, head->prog)) + goto nla_put_failure; + + if (tcf_exts_dump(skb, &head->exts)) + goto nla_put_failure; + + nla_nest_end(skb, nest); + + if (tcf_exts_dump_stats(skb, &head->exts) < 0) + goto nla_put_failure; + + return skb->len; + +nla_put_failure: + nla_nest_cancel(skb, nest); + return -1; +} + +static void p4_bind_class(void *fh, u32 classid, unsigned long cl, void *q, + unsigned long base) +{ + struct cls_p4_head *head = fh; + + if (head && head->res.classid == classid) { + if (cl) + __tcf_bind_filter(q, &head->res, base); + else + __tcf_unbind_filter(q, &head->res); + } +} + +static struct tcf_proto_ops cls_p4_ops __read_mostly = { + .kind = "p4", + .classify = p4_classify, + .init = p4_init, + .destroy = p4_destroy, + .get = p4_get, + .change = p4_change, + .delete = p4_delete, + .walk = p4_walk, + .dump = p4_dump, + .bind_class = p4_bind_class, + .owner = THIS_MODULE, +}; + +static int __init cls_p4_init(void) +{ + return register_tcf_proto_ops(&cls_p4_ops); +} + +static void __exit cls_p4_exit(void) +{ + unregister_tcf_proto_ops(&cls_p4_ops); +} + +module_init(cls_p4_init); +module_exit(cls_p4_exit); + +MODULE_AUTHOR("Mojatatu Networks"); +MODULE_DESCRIPTION("P4 Classifier"); +MODULE_LICENSE("GPL"); diff --git a/net/sched/p4tc/Makefile b/net/sched/p4tc/Makefile index 3fed9a853..726902f10 100644 --- a/net/sched/p4tc/Makefile +++ b/net/sched/p4tc/Makefile @@ -1,6 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 +CFLAGS_trace.o := -I$(src) + obj-y := p4tc_types.o p4tc_tmpl_api.o p4tc_pipeline.o \ p4tc_action.o p4tc_table.o p4tc_tbl_entry.o \ - p4tc_runtime_api.o + p4tc_runtime_api.o trace.o obj-$(CONFIG_DEBUG_INFO_BTF) += p4tc_bpf.o diff --git a/net/sched/p4tc/trace.c b/net/sched/p4tc/trace.c new file mode 100644 index 000000000..683313407 --- /dev/null +++ b/net/sched/p4tc/trace.c @@ -0,0 +1,10 @@ +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) + +#include + +#ifndef __CHECKER__ + +#define CREATE_TRACE_POINTS +#include "trace.h" +EXPORT_TRACEPOINT_SYMBOL_GPL(p4_classify); +#endif diff --git a/net/sched/p4tc/trace.h b/net/sched/p4tc/trace.h new file mode 100644 index 000000000..80abec13b --- /dev/null +++ b/net/sched/p4tc/trace.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM p4tc + +#if !defined(__P4TC_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ) +#define __P4TC_TRACE_H + +#include + +struct p4tc_pipeline; + +TRACE_EVENT(p4_classify, + TP_PROTO(struct sk_buff *skb, struct p4tc_pipeline *pipeline), + + TP_ARGS(skb, pipeline), + + TP_STRUCT__entry(__string(pname, pipeline->common.name) + __field(u32, p_id) + __field(u32, ifindex) + __field(u32, ingress) + ), + + TP_fast_assign(__assign_str(pname, pipeline->common.name); + __entry->p_id = pipeline->common.p_id; + __entry->ifindex = skb->dev->ifindex; + __entry->ingress = skb_at_tc_ingress(skb); + ), + + TP_printk("dev=%u dir=%s pipeline=%s p_id=%u", + __entry->ifindex, + __entry->ingress ? "ingress" : "egress", + __get_str(pname), + __entry->p_id + ) +); + +#endif + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_FILE trace + +#include