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Sat, 11 Apr 2026 23:04:03 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, shuah@kernel.org, emil@etsalapatis.com, leon.hwang@linux.dev, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v3 1/3] bpf: add missing fsession to the verifier log Date: Sun, 12 Apr 2026 14:03:44 +0800 Message-ID: <20260412060346.142007-2-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260412060346.142007-1-dongml2@chinatelecom.cn> References: <20260412060346.142007-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The fsession attach type is missed in the verifier log in check_get_func_ip(), bpf_check_attach_target() and check_attach_btf_id(). Update them to make the verifier log proper. Meanwhile, update the corresponding selftests. Acked-by: Leon Hwang Signed-off-by: Menglong Dong --- v3: - replace "FENTRY/FEXIT/FSESSION" with "Tracing" v2: - add a missing FSESSION in bpf_check_attach_target() --- kernel/bpf/verifier.c | 10 +++++----- tools/testing/selftests/bpf/prog_tests/exceptions.c | 8 ++++---- tools/testing/selftests/bpf/verifier/sleepable.c | 2 +- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 84699a428077..ac89ad992f27 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -11690,7 +11690,7 @@ static int check_get_func_ip(struct bpf_verifier_en= v *env) =20 if (type =3D=3D BPF_PROG_TYPE_TRACING) { if (!bpf_prog_has_trampoline(env->prog)) { - verbose(env, "func %s#%d supported only for fentry/fexit/fmod_ret progr= ams\n", + verbose(env, "func %s#%d supported only for fentry/fexit/fsession/fmod_= ret programs\n", func_id_name(func_id), func_id); return -ENOTSUPP; } @@ -25494,7 +25494,7 @@ int bpf_check_attach_target(struct bpf_verifier_log= *log, btf =3D tgt_prog ? tgt_prog->aux->btf : prog->aux->attach_btf; if (!btf) { bpf_log(log, - "FENTRY/FEXIT program can only be attached to another program annotated= with BTF\n"); + "Tracing program can only be attached to another program annotated with= BTF\n"); return -EINVAL; } t =3D btf_type_by_id(btf, btf_id); @@ -25530,7 +25530,7 @@ int bpf_check_attach_target(struct bpf_verifier_log= *log, if (aux->func && aux->func[subprog]->aux->exception_cb) { bpf_log(log, "%s programs cannot attach to exception callback\n", - prog_extension ? "Extension" : "FENTRY/FEXIT"); + prog_extension ? "Extension" : "Tracing"); return -EINVAL; } conservative =3D aux->func_info_aux[subprog].unreliable; @@ -25619,7 +25619,7 @@ int bpf_check_attach_target(struct bpf_verifier_log= *log, case BPF_TRACE_RAW_TP: if (tgt_prog) { bpf_log(log, - "Only FENTRY/FEXIT progs are attachable to another BPF prog\n"); + "Only FENTRY/FEXIT/FSESSION progs are attachable to another BPF prog\n= "); return -EINVAL; } if (!btf_type_is_typedef(t)) { @@ -25885,7 +25885,7 @@ static int check_attach_btf_id(struct bpf_verifier_= env *env) } =20 if (prog->sleepable && !can_be_sleepable(prog)) { - verbose(env, "Only fentry/fexit/fmod_ret, lsm, iter, uprobe, and struct_= ops programs can be sleepable\n"); + verbose(env, "Only fentry/fexit/fsession/fmod_ret, lsm, iter, uprobe, an= d struct_ops programs can be sleepable\n"); return -EINVAL; } =20 diff --git a/tools/testing/selftests/bpf/prog_tests/exceptions.c b/tools/te= sting/selftests/bpf/prog_tests/exceptions.c index 84ab73e08b0e..e8cbaf2a3e82 100644 --- a/tools/testing/selftests/bpf/prog_tests/exceptions.c +++ b/tools/testing/selftests/bpf/prog_tests/exceptions.c @@ -128,7 +128,7 @@ static void test_exceptions_success(void) bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime), "exception_cb_mod"), "set_attach_target")) goto done; - }), "FENTRY/FEXIT programs cannot attach to exception callback", 0); + }), "Tracing programs cannot attach to exception callback", 0); =20 if (test__start_subtest("throwing fentry -> exception_cb")) RUN_EXT(-EINVAL, true, ({ @@ -138,7 +138,7 @@ static void test_exceptions_success(void) bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime), "exception_cb_mod"), "set_attach_target")) goto done; - }), "FENTRY/FEXIT programs cannot attach to exception callback", 0); + }), "Tracing programs cannot attach to exception callback", 0); =20 if (test__start_subtest("non-throwing fexit -> exception_cb")) RUN_EXT(-EINVAL, true, ({ @@ -148,7 +148,7 @@ static void test_exceptions_success(void) bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime), "exception_cb_mod"), "set_attach_target")) goto done; - }), "FENTRY/FEXIT programs cannot attach to exception callback", 0); + }), "Tracing programs cannot attach to exception callback", 0); =20 if (test__start_subtest("throwing fexit -> exception_cb")) RUN_EXT(-EINVAL, true, ({ @@ -158,7 +158,7 @@ static void test_exceptions_success(void) bpf_program__fd(skel->progs.exception_ext_mod_cb_runtime), "exception_cb_mod"), "set_attach_target")) goto done; - }), "FENTRY/FEXIT programs cannot attach to exception callback", 0); + }), "Tracing programs cannot attach to exception callback", 0); =20 if (test__start_subtest("throwing extension (with custom cb) -> exception= _cb")) RUN_EXT(-EINVAL, true, ({ diff --git a/tools/testing/selftests/bpf/verifier/sleepable.c b/tools/testi= ng/selftests/bpf/verifier/sleepable.c index 1f0d2bdc673f..c2b7f5ebf168 100644 --- a/tools/testing/selftests/bpf/verifier/sleepable.c +++ b/tools/testing/selftests/bpf/verifier/sleepable.c @@ -85,7 +85,7 @@ .expected_attach_type =3D BPF_TRACE_RAW_TP, .kfunc =3D "sched_switch", .result =3D REJECT, - .errstr =3D "Only fentry/fexit/fmod_ret, lsm, iter, uprobe, and struct_op= s programs can be sleepable", + .errstr =3D "Only fentry/fexit/fsession/fmod_ret, lsm, iter, uprobe, and = struct_ops programs can be sleepable", .flags =3D BPF_F_SLEEPABLE, .runs =3D -1, }, --=20 2.53.0 From nobody Mon Jun 15 03:54:03 2026 Received: from mail-pf1-f194.google.com (mail-pf1-f194.google.com [209.85.210.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 81395271468 for ; 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charset="utf-8" Add the fsession attach type to program_types.rst and drgn.rst. Acked-by: Leon Hwang Signed-off-by: Menglong Dong --- Documentation/bpf/drgn.rst | 4 ++-- Documentation/bpf/libbpf/program_types.rst | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/Documentation/bpf/drgn.rst b/Documentation/bpf/drgn.rst index 41f223c3161e..cabf702eb75a 100644 --- a/Documentation/bpf/drgn.rst +++ b/Documentation/bpf/drgn.rst @@ -26,8 +26,8 @@ about these objects, including id, type and name. =20 The main use-case `bpf_inspect.py`_ covers is to show BPF programs of types ``BPF_PROG_TYPE_EXT`` and ``BPF_PROG_TYPE_TRACING`` attached to other BPF -programs via ``freplace``/``fentry``/``fexit`` mechanisms, since there is = no -user-space API to get this information. +programs via ``freplace``/``fentry``/``fexit``/``fsession`` mechanisms, si= nce +there is no user-space API to get this information. =20 Getting started =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D diff --git a/Documentation/bpf/libbpf/program_types.rst b/Documentation/bpf= /libbpf/program_types.rst index 3b837522834b..3a07ce3b7f79 100644 --- a/Documentation/bpf/libbpf/program_types.rst +++ b/Documentation/bpf/libbpf/program_types.rst @@ -207,6 +207,10 @@ described in more detail in the footnotes. + + = +----------------------------------+-----------+ | | = | ``fexit.s+`` [#fentry]_ | Yes | + +-----------------------------= -----------+----------------------------------+-----------+ +| | ``BPF_TRACE_FSESSION`` = | ``fsession+`` [#fentry]_ | | ++ + = +----------------------------------+-----------+ +| | = | ``fsession.s+`` [#fentry]_ | Yes | ++ +-----------------------------= -----------+----------------------------------+-----------+ | | ``BPF_TRACE_ITER`` = | ``iter+`` [#iter]_ | | + + = +----------------------------------+-----------+ | | = | ``iter.s+`` [#iter]_ | Yes | --=20 2.53.0 From nobody Mon Jun 15 03:54:03 2026 Received: from mail-pf1-f195.google.com (mail-pf1-f195.google.com [209.85.210.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A235823A566 for ; 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Sat, 11 Apr 2026 23:04:16 -0700 (PDT) Received: from 7950hx ([103.173.155.241]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f0c4b251esm7072645b3a.37.2026.04.11.23.04.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 11 Apr 2026 23:04:15 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, shuah@kernel.org, emil@etsalapatis.com, leon.hwang@linux.dev, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v3 3/3] bpftool: add missing fsession to the usage and docs of bpftool Date: Sun, 12 Apr 2026 14:03:46 +0800 Message-ID: <20260412060346.142007-4-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260412060346.142007-1-dongml2@chinatelecom.cn> References: <20260412060346.142007-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the fsession attach type to the usage of bpftool in do_help(). Meanwhile, add it to the bash-completion and bpftool-prog.rst too. Acked-by: Leon Hwang Acked-by: Quentin Monnet Signed-off-by: Menglong Dong --- tools/bpf/bpftool/Documentation/bpftool-prog.rst | 2 +- tools/bpf/bpftool/bash-completion/bpftool | 2 +- tools/bpf/bpftool/prog.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/b= pftool/Documentation/bpftool-prog.rst index 35aeeaf5f711..90fa2a48cc26 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst @@ -54,7 +54,7 @@ PROG COMMANDS | **cgroup/sendmsg4** | **cgroup/sendmsg6** | **cgroup/sendmsg_unix** | | **cgroup/recvmsg4** | **cgroup/recvmsg6** | **cgroup/recvmsg_unix** = | **cgroup/sysctl** | | **cgroup/getsockopt** | **cgroup/setsockopt** | **cgroup/sock_releas= e** | -| **struct_ops** | **fentry** | **fexit** | **freplace** | **sk_lookup= ** +| **struct_ops** | **fentry** | **fexit** | **fsession** | **freplace*= * | **sk_lookup** | } | *ATTACH_TYPE* :=3D { | **sk_msg_verdict** | **sk_skb_verdict** | **sk_skb_stream_verdict** | diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/= bash-completion/bpftool index babb0d4e9753..75cbcb512eba 100644 --- a/tools/bpf/bpftool/bash-completion/bpftool +++ b/tools/bpf/bpftool/bash-completion/bpftool @@ -501,7 +501,7 @@ _bpftool() cgroup/post_bind4 cgroup/post_bind6 \ cgroup/sysctl cgroup/getsockopt \ cgroup/setsockopt cgroup/sock_release stru= ct_ops \ - fentry fexit freplace sk_lookup' + fentry fexit fsession freplace sk_lookup' COMPREPLY=3D( $( compgen -W "$BPFTOOL_PROG_LOA= D_TYPES" -- "$cur" ) ) return 0 ;; diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 6daf19809ca4..a9f730d407a9 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -2583,7 +2583,7 @@ static int do_help(int argc, char **argv) " cgroup/getsockname_unix | cgroup/sendmsg4 | cgroup/sen= dmsg6 |\n" " cgroup/sendmsg_unix | cgroup/recvmsg4 | cgroup/recvmsg= 6 | cgroup/recvmsg_unix |\n" " cgroup/getsockopt | cgroup/setsockopt | cgroup/sock_re= lease |\n" - " struct_ops | fentry | fexit | freplace | sk_lookup }\n" + " struct_ops | fentry | fexit | fsession | freplace | sk= _lookup }\n" " ATTACH_TYPE :=3D { sk_msg_verdict | sk_skb_verdict | sk_skb_stre= am_verdict |\n" " sk_skb_stream_parser | flow_dissector }\n" " METRIC :=3D { cycles | instructions | l1d_loads | llc_misses | i= tlb_misses | dtlb_misses }\n" --=20 2.53.0