From patchwork Fri Nov 17 01:17:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nambiar, Amritha" X-Patchwork-Id: 13458321 X-Patchwork-Delegate: kuba@kernel.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="HFFEvMIl" Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5984129 for ; Thu, 16 Nov 2023 17:00:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1700182852; x=1731718852; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=f0oajfSxEBFyJbLaE46yh7HqFQyNRRRdwe3k+CRd0gA=; b=HFFEvMIlHCea1BxdHoFn83s1AK1M5XRTj3weBVSiFUvCiL5CxbSJzZAQ cSO3u4tiCbCPbZIITRZcVKsmqRHvoXV1rowkZLv4XGQLrzaSItzqdOa6P m0Ojm9g28hHeocRcDepUohLmCYOzapaB6vbblMz3geoeOrRGC+5Y33Ddh 19eu5u1vYeNkvSWzaMKZVwmglWUEWGbko6B4DomdtNrdvuyBhjhuEA9t5 ilZ1uzIdjW0Sd+/PoqqV+DTIwp7nb/aI5/t+CZQwwGfcQCuwt9HrQIfAO BtMBUmgLlZFYxpFE3/YtqUlA9N3GqK36+BM5hRZCvEaQlN5cT2bjJ2Vca A==; X-IronPort-AV: E=McAfee;i="6600,9927,10896"; a="4288538" X-IronPort-AV: E=Sophos;i="6.04,205,1695711600"; d="scan'208";a="4288538" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Nov 2023 17:00:52 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10896"; a="831449265" X-IronPort-AV: E=Sophos;i="6.04,205,1695711600"; d="scan'208";a="831449265" Received: from anambiarhost.jf.intel.com ([10.166.29.163]) by fmsmga008.fm.intel.com with ESMTP; 16 Nov 2023 17:00:51 -0800 Subject: [net-next PATCH v8 06/10] netdev-genl: Add netlink framework functions for napi From: Amritha Nambiar To: netdev@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com Cc: sridhar.samudrala@intel.com, amritha.nambiar@intel.com Date: Thu, 16 Nov 2023 17:17:09 -0800 Message-ID: <170018382918.3767.18319485691680146351.stgit@anambiarhost.jf.intel.com> In-Reply-To: <170018355327.3767.5169918029687620348.stgit@anambiarhost.jf.intel.com> References: <170018355327.3767.5169918029687620348.stgit@anambiarhost.jf.intel.com> User-Agent: StGit/unknown-version Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org Implement the netdev netlink framework functions for napi support. The netdev structure tracks all the napi instances and napi fields. The napi instances and associated parameters can be retrieved this way. Signed-off-by: Amritha Nambiar Reviewed-by: Sridhar Samudrala --- net/core/dev.c | 3 - net/core/dev.h | 2 + net/core/netdev-genl.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++- 3 files changed, 117 insertions(+), 4 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index cdbc916d0208..fcbfecdf5e5b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -165,7 +165,6 @@ static int netif_rx_internal(struct sk_buff *skb); static int call_netdevice_notifiers_extack(unsigned long val, struct net_device *dev, struct netlink_ext_ack *extack); -static struct napi_struct *napi_by_id(unsigned int napi_id); /* * The @dev_base_head list is protected by @dev_base_lock and the rtnl @@ -6139,7 +6138,7 @@ bool napi_complete_done(struct napi_struct *n, int work_done) EXPORT_SYMBOL(napi_complete_done); /* must be called under rcu_read_lock(), as we dont take a reference */ -static struct napi_struct *napi_by_id(unsigned int napi_id) +struct napi_struct *napi_by_id(unsigned int napi_id) { unsigned int hash = napi_id % HASH_SIZE(napi_hash); struct napi_struct *napi; diff --git a/net/core/dev.h b/net/core/dev.h index 5aa45f0fd4ae..7795b8ad841d 100644 --- a/net/core/dev.h +++ b/net/core/dev.h @@ -145,4 +145,6 @@ void xdp_do_check_flushed(struct napi_struct *napi); #else static inline void xdp_do_check_flushed(struct napi_struct *napi) { } #endif + +struct napi_struct *napi_by_id(unsigned int napi_id); #endif diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 9386058146a1..fda6d06995e0 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -7,13 +7,16 @@ #include #include #include +#include #include "netdev-genl-gen.h" +#include "dev.h" struct netdev_nl_dump_ctx { unsigned long ifindex; unsigned int rxq_idx; unsigned int txq_idx; + unsigned int napi_id; }; static struct netdev_nl_dump_ctx *netdev_dump_ctx(struct netlink_callback *cb) @@ -144,14 +147,123 @@ int netdev_nl_dev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) return skb->len; } +static int +netdev_nl_napi_fill_one(struct sk_buff *rsp, struct napi_struct *napi, + const struct genl_info *info) +{ + void *hdr; + + if (WARN_ON_ONCE(!napi->dev)) + return -EINVAL; + + hdr = genlmsg_iput(rsp, info); + if (!hdr) + return -EMSGSIZE; + + if (napi->napi_id >= MIN_NAPI_ID && + nla_put_u32(rsp, NETDEV_A_NAPI_ID, napi->napi_id)) + goto nla_put_failure; + + if (nla_put_u32(rsp, NETDEV_A_NAPI_IFINDEX, napi->dev->ifindex)) + goto nla_put_failure; + + genlmsg_end(rsp, hdr); + return 0; + +nla_put_failure: + genlmsg_cancel(rsp, hdr); + return -EMSGSIZE; +} + int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) { - return -EOPNOTSUPP; + struct napi_struct *napi; + struct sk_buff *rsp; + u32 napi_id; + int err; + + if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_NAPI_ID)) + return -EINVAL; + + napi_id = nla_get_u32(info->attrs[NETDEV_A_NAPI_ID]); + + rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!rsp) + return -ENOMEM; + + rtnl_lock(); + + napi = napi_by_id(napi_id); + if (napi) + err = netdev_nl_napi_fill_one(rsp, napi, info); + else + err = -EINVAL; + + rtnl_unlock(); + + if (err) + goto err_free_msg; + + return genlmsg_reply(rsp, info); + +err_free_msg: + nlmsg_free(rsp); + return err; +} + +static int +netdev_nl_napi_dump_one(struct net_device *netdev, struct sk_buff *rsp, + const struct genl_info *info, + struct netdev_nl_dump_ctx *ctx) +{ + struct napi_struct *napi; + int err = 0; + + list_for_each_entry(napi, &netdev->napi_list, dev_list) { + if (ctx->napi_id && napi->napi_id >= ctx->napi_id) + continue; + + err = netdev_nl_napi_fill_one(rsp, napi, info); + if (err) + return err; + ctx->napi_id = napi->napi_id; + } + return err; } int netdev_nl_napi_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) { - return -EOPNOTSUPP; + struct netdev_nl_dump_ctx *ctx = netdev_dump_ctx(cb); + const struct genl_info *info = genl_info_dump(cb); + struct net *net = sock_net(skb->sk); + struct net_device *netdev; + u32 ifindex = 0; + int err = 0; + + if (info->attrs[NETDEV_A_NAPI_IFINDEX]) + ifindex = nla_get_u32(info->attrs[NETDEV_A_NAPI_IFINDEX]); + + rtnl_lock(); + if (ifindex) { + netdev = __dev_get_by_index(net, ifindex); + if (netdev) + err = netdev_nl_napi_dump_one(netdev, skb, info, ctx); + else + err = -ENODEV; + } else { + for_each_netdev_dump(net, netdev, ctx->ifindex) { + err = netdev_nl_napi_dump_one(netdev, skb, info, ctx); + if (err < 0) + break; + ctx->napi_id = 0; + } + } + rtnl_unlock(); + + if (err != -EMSGSIZE) + return err; + + return skb->len; } static int