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Sat, 18 Oct 2025 07:22:06 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org, jolsa@kernel.org Cc: daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, mattbobrowski@google.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, leon.hwang@linux.dev, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC bpf-next 5/5] selftests/bpf: add testcases for tracing session Date: Sat, 18 Oct 2025 22:21:24 +0800 Message-ID: <20251018142124.783206-6-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251018142124.783206-1-dongml2@chinatelecom.cn> References: <20251018142124.783206-1-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 testcases for BPF_TRACE_SESSION. Signed-off-by: Menglong Dong --- .../selftests/bpf/prog_tests/fsession_test.c | 136 +++++++++++++ .../selftests/bpf/progs/fsession_test.c | 178 ++++++++++++++++++ 2 files changed, 314 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/fsession_test.c create mode 100644 tools/testing/selftests/bpf/progs/fsession_test.c diff --git a/tools/testing/selftests/bpf/prog_tests/fsession_test.c b/tools= /testing/selftests/bpf/prog_tests/fsession_test.c new file mode 100644 index 000000000000..e2913da57b38 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/fsession_test.c @@ -0,0 +1,136 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include +#include "fsession_test.skel.h" + +static void test_fsession_basic(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct fsession_test *skel =3D NULL; + int err, prog_fd; + + skel =3D fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + err =3D fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_attach")) + goto cleanup; + + /* Trigger test function calls */ + prog_fd =3D bpf_program__fd(skel->progs.test1); + err =3D bpf_prog_test_run_opts(prog_fd, &topts); + if (!ASSERT_OK(err, "test_run_opts err")) + return; + if (!ASSERT_OK(topts.retval, "test_run_opts retval")) + return; + + /* Verify test1: both entry and exit are called */ + ASSERT_EQ(skel->bss->test1_entry_called, 1, "test1_entry_called"); + ASSERT_EQ(skel->bss->test1_exit_called, 1, "test1_exit_called"); + ASSERT_EQ(skel->bss->test1_entry_result, 1, "test1_entry_result"); + ASSERT_EQ(skel->bss->test1_exit_result, 1, "test1_exit_result"); + + /* Verify test2: entry is called but exit is blocked */ + ASSERT_EQ(skel->bss->test2_entry_called, 1, "test2_entry_called"); + ASSERT_EQ(skel->bss->test2_exit_called, 0, "test2_exit_not_called"); + ASSERT_EQ(skel->bss->test2_entry_result, 1, "test2_entry_result"); + ASSERT_EQ(skel->bss->test2_exit_result, 0, "test2_exit_result"); + + /* Verify test3: both entry and exit are called */ + ASSERT_EQ(skel->bss->test3_entry_called, 1, "test3_entry_called"); + ASSERT_EQ(skel->bss->test3_exit_called, 1, "test3_exit_called"); + ASSERT_EQ(skel->bss->test3_entry_result, 1, "test3_entry_result"); + ASSERT_EQ(skel->bss->test3_exit_result, 1, "test3_exit_result"); + + /* Verify test4: both entry and exit are called */ + ASSERT_EQ(skel->bss->test4_entry_called, 1, "test4_entry_called"); + ASSERT_EQ(skel->bss->test4_exit_called, 1, "test4_exit_called"); + ASSERT_EQ(skel->bss->test4_entry_result, 1, "test4_entry_result"); + ASSERT_EQ(skel->bss->test4_exit_result, 1, "test4_exit_result"); + + /* Verify test5: both entry and exit are called */ + ASSERT_EQ(skel->bss->test5_entry_called, 1, "test5_entry_called"); + ASSERT_EQ(skel->bss->test5_exit_called, 1, "test5_exit_called"); + ASSERT_EQ(skel->bss->test5_entry_result, 1, "test5_entry_result"); + ASSERT_EQ(skel->bss->test5_exit_result, 1, "test5_exit_result"); + + /* Verify test6: entry is called but exit is blocked */ + ASSERT_EQ(skel->bss->test6_entry_called, 1, "test6_entry_called"); + ASSERT_EQ(skel->bss->test6_exit_called, 0, "test6_exit_not_called"); + ASSERT_EQ(skel->bss->test6_entry_result, 1, "test6_entry_result"); + ASSERT_EQ(skel->bss->test6_exit_result, 0, "test6_exit_result"); + + /* Verify test7: entry is called but exit is blocked */ + ASSERT_EQ(skel->bss->test7_entry_called, 1, "test7_entry_called"); + ASSERT_EQ(skel->bss->test7_exit_called, 0, "test7_exit_not_called"); + ASSERT_EQ(skel->bss->test7_entry_result, 1, "test7_entry_result"); + ASSERT_EQ(skel->bss->test7_exit_result, 0, "test7_exit_result"); + +cleanup: + fsession_test__destroy(skel); +} + +static void test_fsession_reattach(void) +{ + struct fsession_test *skel =3D NULL; + int err, prog_fd; + LIBBPF_OPTS(bpf_test_run_opts, topts); + + skel =3D fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + /* First attach */ + err =3D fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_first_attach")) + goto cleanup; + + /* Trigger test function calls */ + prog_fd =3D bpf_program__fd(skel->progs.test1); + err =3D bpf_prog_test_run_opts(prog_fd, &topts); + if (!ASSERT_OK(err, "test_run_opts err")) + return; + if (!ASSERT_OK(topts.retval, "test_run_opts retval")) + return; + + /* Verify first call */ + ASSERT_EQ(skel->bss->test1_entry_called, 1, "test1_entry_first"); + ASSERT_EQ(skel->bss->test1_exit_called, 1, "test1_exit_first"); + + /* Detach */ + fsession_test__detach(skel); + + /* Reset counters */ + memset(skel->bss, 0, sizeof(*skel->bss)); + + /* Second attach */ + err =3D fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_second_attach")) + goto cleanup; + + err =3D bpf_prog_test_run_opts(prog_fd, &topts); + if (!ASSERT_OK(err, "test_run_opts err")) + return; + if (!ASSERT_OK(topts.retval, "test_run_opts retval")) + return; + + /* Verify second call */ + ASSERT_EQ(skel->bss->test1_entry_called, 1, "test1_entry_second"); + ASSERT_EQ(skel->bss->test1_exit_called, 1, "test1_exit_second"); + +cleanup: + fsession_test__destroy(skel); +} + +void test_fsession_test(void) +{ +#if !defined(__x86_64__) + test__skip(); + return; +#endif + if (test__start_subtest("fsession_basic")) + test_fsession_basic(); + if (test__start_subtest("fsession_reattach")) + test_fsession_reattach(); +} diff --git a/tools/testing/selftests/bpf/progs/fsession_test.c b/tools/test= ing/selftests/bpf/progs/fsession_test.c new file mode 100644 index 000000000000..cce2b32f7c2c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/fsession_test.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include +#include +#include + +char _license[] SEC("license") =3D "GPL"; + +__u64 test1_entry_result =3D 0; +__u64 test1_exit_result =3D 0; +__u64 test1_entry_called =3D 0; +__u64 test1_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test1, int a) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test1_entry_called =3D 1; + test1_entry_result =3D a =3D=3D 1; + return 0; /* Return 0 to allow exit to be called */ + } + + /* This is exit */ + test1_exit_called =3D 1; + test1_exit_result =3D a =3D=3D 1; + return 0; +} + +__u64 test2_entry_result =3D 0; +__u64 test2_exit_result =3D 0; +__u64 test2_entry_called =3D 0; +__u64 test2_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test2") +int BPF_PROG(test2, int a, __u64 b) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test2_entry_called =3D 1; + test2_entry_result =3D a =3D=3D 2 && b =3D=3D 3; + return 1; /* Return non-zero value to block exit call */ + } + + /* This is exit - should not be called due to blocking */ + test2_exit_called =3D 1; + test2_exit_result =3D a =3D=3D 2 && b =3D=3D 3; + return 0; +} + +__u64 test3_entry_result =3D 0; +__u64 test3_exit_result =3D 0; +__u64 test3_entry_called =3D 0; +__u64 test3_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test3") +int BPF_PROG(test3, char a, int b, __u64 c) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test3_entry_called =3D 1; + test3_entry_result =3D a =3D=3D 4 && b =3D=3D 5 && c =3D=3D 6; + return 0; /* Allow exit to be called */ + } + + /* This is exit */ + test3_exit_called =3D 1; + test3_exit_result =3D a =3D=3D 4 && b =3D=3D 5 && c =3D=3D 6; + return 0; +} + +__u64 test4_entry_result =3D 0; +__u64 test4_exit_result =3D 0; +__u64 test4_entry_called =3D 0; +__u64 test4_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test4") +int BPF_PROG(test4, void *a, char b, int c, __u64 d) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test4_entry_called =3D 1; + test4_entry_result =3D a =3D=3D (void *)7 && b =3D=3D 8 && c =3D=3D 9 &&= d =3D=3D 10; + return 0; /* Allow exit to be called */ + } + + /* This is exit */ + test4_exit_called =3D 1; + test4_exit_result =3D a =3D=3D (void *)7 && b =3D=3D 8 && c =3D=3D 9 && d= =3D=3D 10; + return 0; +} + +__u64 test5_entry_result =3D 0; +__u64 test5_exit_result =3D 0; +__u64 test5_entry_called =3D 0; +__u64 test5_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test7") +int BPF_PROG(test5, struct bpf_fentry_test_t *arg) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test5_entry_called =3D 1; + if (!arg) + test5_entry_result =3D 1; + return 0; /* Allow exit to be called */ + } + + /* This is exit */ + test5_exit_called =3D 1; + if (!arg) + test5_exit_result =3D 1; + return 0; +} + +__u64 test6_entry_result =3D 0; +__u64 test6_exit_result =3D 0; +__u64 test6_entry_called =3D 0; +__u64 test6_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test5") +int BPF_PROG(test6, __u64 a, void *b, short c, int d, __u64 e) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test6_entry_called =3D 1; + test6_entry_result =3D a =3D=3D 11 && b =3D=3D (void *)12 && c =3D=3D 13= && d =3D=3D 14 && + e =3D=3D 15; + /* Decide whether to block exit call based on condition */ + if (a =3D=3D 11) + return 1; /* Block exit call */ + return 0; + } + + /* This is exit - should not be called due to blocking */ + test6_exit_called =3D 1; + test6_exit_result =3D a =3D=3D 11 && b =3D=3D (void *)12 && c =3D=3D 13 &= & d =3D=3D 14 && + e =3D=3D 15; + return 0; +} + +__u64 test7_entry_result =3D 0; +__u64 test7_exit_result =3D 0; +__u64 test7_entry_called =3D 0; +__u64 test7_exit_called =3D 0; + +SEC("fsession/bpf_fentry_test6") +int BPF_PROG(test7, __u64 a, void *b, short c, int d, void *e, __u64 f) +{ + bool is_exit =3D bpf_tracing_is_exit(ctx); + + if (!is_exit) { + /* This is entry */ + test7_entry_called =3D 1; + test7_entry_result =3D a =3D=3D 16 && b =3D=3D (void *)17 && c =3D=3D 18= && d =3D=3D 19 && + e =3D=3D (void *)20 && f =3D=3D 21; + /* Return non-zero to block exit call */ + return 1; + } + + /* This is exit - should not be called due to blocking */ + test7_exit_called =3D 1; + test7_exit_result =3D a =3D=3D 16 && b =3D=3D (void *)17 && c =3D=3D 18 &= & d =3D=3D 19 && + e =3D=3D (void *)20 && f =3D=3D 21; + return 0; +} --=20 2.51.0