From patchwork Thu Aug 26 19:39:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiri Olsa X-Patchwork-Id: 12460581 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3BB98C4320E for ; Thu, 26 Aug 2021 19:41:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 23A3B610CB for ; Thu, 26 Aug 2021 19:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243489AbhHZTm0 (ORCPT ); Thu, 26 Aug 2021 15:42:26 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:39338 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243615AbhHZTm0 (ORCPT ); Thu, 26 Aug 2021 15:42:26 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1630006898; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sNOph7fDuFs97Eha5R8U+AbH+ZbOQ2fdynr7Ppgl9xo=; b=b57Bi3IzL+hQo7tH1pim1ZRafH0OZ+Ur5OqbZLuFFIdV33wbpJTm1ch8ob86XkjG2u8QX7 QdYO71wA07dlvrwNOb08zbC6++8FQ5bwLZPu+dqtjp3PF8NtxGU1F/p1Msx8MkL9ePtref DpHg4ENm8eK+n8OM1VoB5niUued1GYo= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-602-ZMnDMkuQMby9068he42_Kw-1; Thu, 26 Aug 2021 15:41:36 -0400 X-MC-Unique: ZMnDMkuQMby9068he42_Kw-1 Received: by mail-wm1-f71.google.com with SMTP id 201-20020a1c01d2000000b002e72ba822dcso4763425wmb.6 for ; Thu, 26 Aug 2021 12:41:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=sNOph7fDuFs97Eha5R8U+AbH+ZbOQ2fdynr7Ppgl9xo=; b=SzaOFhdN8pnmK38itpye8PkqEcFipjdD35EcABGdb+nMdsAhxXX73jP4eXna1djy7d 3vMWZ38ATrVDcRqJNXbHitmza3CWdIT0d7dMdddNQqRNW4ta/nP2ve8jDwzOmNtbz6sL X6h2kriKttPgu+hQNaNZ6YMj8HSC07kVLKLgRhTFETKkTEONOWoMbay/vaTriyOaF+KT kzLvT1VLgsxthvmSUjYj35YQlErcAdyvA5kHzHRXJ7UKNDLDsl8k/OmZ62KyZa22HUeC XFqeZ1EMTQ850wTT9pQoMg7wX9/8Ns59hCuemC9oex5YgSilprEs0WTrIQvDlZkUOSB6 9DEg== X-Gm-Message-State: AOAM532Td2qL4CPPzF2TCmSi3HtZLqKufhk/L7JyAhRKlqtp/T5iWQ4n aM7GCaCHKIcOtfRoaGyVCGY4AO/7GeLUjbfJlS3t0EBBohjkaofDzwfEfVIAVRCgzWIJviTh/IS F/Ti03vbnDQzH X-Received: by 2002:a5d:65cc:: with SMTP id e12mr6218294wrw.266.1630006894649; Thu, 26 Aug 2021 12:41:34 -0700 (PDT) X-Google-Smtp-Source: ABdhPJz1VfBS9lN1U/9ZDy+tjTNLSfUPE3NMeOcXS6gjf3AKHcPmgkRW6/Zzyv3AhZ1r8BdB6dgFyg== X-Received: by 2002:a5d:65cc:: with SMTP id e12mr6218280wrw.266.1630006894474; Thu, 26 Aug 2021 12:41:34 -0700 (PDT) Received: from krava.redhat.com ([83.240.63.86]) by smtp.gmail.com with ESMTPSA id q11sm9133336wmc.41.2021.08.26.12.41.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Aug 2021 12:41:34 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , "Steven Rostedt (VMware)" Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Daniel Xu , Viktor Malik Subject: [PATCH bpf-next v4 21/27] libbpf: Add support to link multi func tracing program Date: Thu, 26 Aug 2021 21:39:16 +0200 Message-Id: <20210826193922.66204-22-jolsa@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210826193922.66204-1-jolsa@kernel.org> References: <20210826193922.66204-1-jolsa@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Adding support to link multi func tracing program through link_create interface. Adding special types for multi func programs: fentry.multi fexit.multi so you can define multi func programs like: SEC("fentry.multi/bpf_fentry_test*") int BPF_PROG(test1, __u64 a, __u64 b, __u64 c, __u64 d, __u64 e, __u64 f) that defines test1 to be attached to bpf_fentry_test* functions. The test1 program is loaded with BPF_F_MULTI_FUNC flag. If functions are not specified the program needs to be attached manually. Adding new btf_ids/btf_ids_cnt fields to bpf_link_create_opts, that define functions to attach the program to. Signed-off-by: Jiri Olsa --- tools/lib/bpf/bpf.c | 8 +++++ tools/lib/bpf/bpf.h | 6 +++- tools/lib/bpf/libbpf.c | 72 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 2401fad090c5..20422d58b945 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -713,12 +713,20 @@ int bpf_link_create(int prog_fd, int target_fd, if (!OPTS_ZEROED(opts, perf_event)) return libbpf_err(-EINVAL); break; + case BPF_TRACE_FENTRY: + case BPF_TRACE_FEXIT: + attr.link_create.multi_btf_ids = (__u64) OPTS_GET(opts, multi.btf_ids, 0); + attr.link_create.multi_btf_ids_cnt = OPTS_GET(opts, multi.btf_ids_cnt, 0); + if (!OPTS_ZEROED(opts, multi)) + return libbpf_err(-EINVAL); + break; default: if (!OPTS_ZEROED(opts, flags)) return libbpf_err(-EINVAL); break; } proceed: + fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); return libbpf_err_errno(fd); } diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 6fffb3cdf39b..2eff99be7069 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -181,10 +181,14 @@ struct bpf_link_create_opts { struct { __u64 bpf_cookie; } perf_event; + struct { + __u32 *btf_ids; + __u32 btf_ids_cnt; + } multi; }; size_t :0; }; -#define bpf_link_create_opts__last_field perf_event +#define bpf_link_create_opts__last_field multi LIBBPF_API int bpf_link_create(int prog_fd, int target_fd, enum bpf_attach_type attach_type, diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 88d8825fc6f6..7f717b7755be 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -230,6 +230,7 @@ struct bpf_sec_def { bool is_attachable; bool is_attach_btf; bool is_sleepable; + bool is_multi_func; attach_fn_t attach_fn; }; @@ -6446,6 +6447,8 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz, if (prog->sec_def->is_sleepable) prog->prog_flags |= BPF_F_SLEEPABLE; + if (prog->sec_def->is_multi_func) + prog->prog_flags |= BPF_F_MULTI_FUNC; bpf_program__set_type(prog, prog->sec_def->prog_type); bpf_program__set_expected_attach_type(prog, prog->sec_def->expected_attach_type); @@ -7915,6 +7918,8 @@ static struct bpf_link *attach_raw_tp(const struct bpf_sec_def *sec, struct bpf_program *prog); static struct bpf_link *attach_trace(const struct bpf_sec_def *sec, struct bpf_program *prog); +static struct bpf_link *attach_trace_multi(const struct bpf_sec_def *sec, + struct bpf_program *prog); static struct bpf_link *attach_lsm(const struct bpf_sec_def *sec, struct bpf_program *prog); static struct bpf_link *attach_iter(const struct bpf_sec_def *sec, @@ -7991,6 +7996,14 @@ static const struct bpf_sec_def section_defs[] = { .attach_fn = attach_iter), SEC_DEF("syscall", SYSCALL, .is_sleepable = true), + SEC_DEF("fentry.multi/", TRACING, + .expected_attach_type = BPF_TRACE_FENTRY, + .is_multi_func = true, + .attach_fn = attach_trace_multi), + SEC_DEF("fexit.multi/", TRACING, + .expected_attach_type = BPF_TRACE_FEXIT, + .is_multi_func = true, + .attach_fn = attach_trace_multi), BPF_EAPROG_SEC("xdp_devmap/", BPF_PROG_TYPE_XDP, BPF_XDP_DEVMAP), BPF_EAPROG_SEC("xdp_cpumap/", BPF_PROG_TYPE_XDP, @@ -8435,6 +8448,9 @@ static int libbpf_find_attach_btf_id(struct bpf_program *prog, int *btf_obj_fd, if (!name) return -EINVAL; + if (prog->prog_flags & BPF_F_MULTI_FUNC) + return 0; + for (i = 0; i < ARRAY_SIZE(section_defs); i++) { if (!section_defs[i].is_attach_btf) continue; @@ -9523,6 +9539,62 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog) return (struct bpf_link *)link; } +static struct bpf_link *bpf_program__attach_multi(struct bpf_program *prog) +{ + char *pattern = prog->sec_name + prog->sec_def->len; + DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts); + enum bpf_attach_type attach_type; + int prog_fd, link_fd, cnt, err; + struct bpf_link *link = NULL; + __u32 *ids = NULL; + + prog_fd = bpf_program__fd(prog); + if (prog_fd < 0) { + pr_warn("prog '%s': can't attach before loaded\n", prog->name); + return ERR_PTR(-EINVAL); + } + + err = bpf_object__load_vmlinux_btf(prog->obj, true); + if (err) + return ERR_PTR(err); + + cnt = btf__find_by_glob_kind(prog->obj->btf_vmlinux, BTF_KIND_FUNC, + pattern, NULL, &ids); + if (cnt <= 0) + return ERR_PTR(-EINVAL); + + link = calloc(1, sizeof(*link)); + if (!link) { + err = -ENOMEM; + goto out_err; + } + link->detach = &bpf_link__detach_fd; + + opts.multi.btf_ids = ids; + opts.multi.btf_ids_cnt = cnt; + + attach_type = bpf_program__get_expected_attach_type(prog); + link_fd = bpf_link_create(prog_fd, 0, attach_type, &opts); + if (link_fd < 0) { + err = -errno; + goto out_err; + } + link->fd = link_fd; + free(ids); + return link; + +out_err: + free(link); + free(ids); + return ERR_PTR(err); +} + +static struct bpf_link *attach_trace_multi(const struct bpf_sec_def *sec, + struct bpf_program *prog) +{ + return bpf_program__attach_multi(prog); +} + struct bpf_link *bpf_program__attach_trace(struct bpf_program *prog) { return bpf_program__attach_btf_id(prog);