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Tue, 06 Jan 2026 22:45:40 -0800 (PST) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org, andrii@kernel.org Cc: daniel@iogearbox.net, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, dsahern@kernel.org, tglx@linutronix.de, mingo@redhat.com, jiang.biao@linux.dev, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v7 09/11] selftests/bpf: add testcases for fsession Date: Wed, 7 Jan 2026 14:43:50 +0800 Message-ID: <20260107064352.291069-10-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260107064352.291069-1-dongml2@chinatelecom.cn> References: <20260107064352.291069-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add testcases for BPF_TRACE_FSESSION. The function arguments and return value are tested both in the entry and exit. And the kfunc bpf_session_is_ret() is also tested. As the layout of the stack changed for fsession, so we also test bpf_get_func_ip() for it. Signed-off-by: Menglong Dong --- v3: - restructure the testcase by combine the testcases for session cookie and get_func_ip into one patch --- .../selftests/bpf/prog_tests/fsession_test.c | 90 ++++++++++++++ .../selftests/bpf/progs/fsession_test.c | 110 ++++++++++++++++++ 2 files changed, 200 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..83f3953a1ff6 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/fsession_test.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include +#include "fsession_test.skel.h" + +static int check_result(struct fsession_test *skel) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + int err, prog_fd; + + /* Trigger test function calls */ + prog_fd = bpf_program__fd(skel->progs.test1); + err = bpf_prog_test_run_opts(prog_fd, &topts); + if (!ASSERT_OK(err, "test_run_opts err")) + return err; + if (!ASSERT_OK(topts.retval, "test_run_opts retval")) + return topts.retval; + + for (int i = 0; i < sizeof(*skel->bss) / sizeof(__u64); i++) { + if (!ASSERT_EQ(((__u64 *)skel->bss)[i], 1, "test_result")) + return -EINVAL; + } + + return 0; +} + +static void test_fsession_basic(void) +{ + struct fsession_test *skel = NULL; + int err; + + skel = fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_attach")) + goto cleanup; + + check_result(skel); +cleanup: + fsession_test__destroy(skel); +} + +static void test_fsession_reattach(void) +{ + struct fsession_test *skel = NULL; + int err; + + skel = fsession_test__open_and_load(); + if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load")) + goto cleanup; + + /* First attach */ + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_first_attach")) + goto cleanup; + + if (check_result(skel)) + goto cleanup; + + /* Detach */ + fsession_test__detach(skel); + + /* Reset counters */ + memset(skel->bss, 0, sizeof(*skel->bss)); + + /* Second attach */ + err = fsession_test__attach(skel); + if (!ASSERT_OK(err, "fsession_second_attach")) + goto cleanup; + + if (check_result(skel)) + goto cleanup; + +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/testing/selftests/bpf/progs/fsession_test.c new file mode 100644 index 000000000000..f504984d42f2 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/fsession_test.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2025 ChinaTelecom */ +#include +#include +#include + +char _license[] SEC("license") = "GPL"; + +__u64 test1_entry_result = 0; +__u64 test1_exit_result = 0; + +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test1, int a, int ret) +{ + bool is_exit = bpf_session_is_return(ctx); + + if (!is_exit) { + test1_entry_result = a == 1 && ret == 0; + return 0; + } + + test1_exit_result = a == 1 && ret == 2; + return 0; +} + +__u64 test2_entry_result = 0; +__u64 test2_exit_result = 0; + +SEC("fsession/bpf_fentry_test3") +int BPF_PROG(test2, char a, int b, __u64 c, int ret) +{ + bool is_exit = bpf_session_is_return(ctx); + + if (!is_exit) { + test2_entry_result = a == 4 && b == 5 && c == 6 && ret == 0; + return 0; + } + + test2_exit_result = a == 4 && b == 5 && c == 6 && ret == 15; + return 0; +} + +__u64 test3_entry_result = 0; +__u64 test3_exit_result = 0; + +SEC("fsession/bpf_fentry_test4") +int BPF_PROG(test3, void *a, char b, int c, __u64 d, int ret) +{ + bool is_exit = bpf_session_is_return(ctx); + + if (!is_exit) { + test3_entry_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 0; + return 0; + } + + test3_exit_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 34; + return 0; +} + +__u64 test4_entry_result = 0; +__u64 test4_exit_result = 0; + +SEC("fsession/bpf_fentry_test5") +int BPF_PROG(test4, __u64 a, void *b, short c, int d, __u64 e, int ret) +{ + bool is_exit = bpf_session_is_return(ctx); + + if (!is_exit) { + test4_entry_result = a == 11 && b == (void *)12 && c == 13 && d == 14 && + e == 15 && ret == 0; + return 0; + } + + test4_exit_result = a == 11 && b == (void *)12 && c == 13 && d == 14 && + e == 15 && ret == 65; + return 0; +} + +__u64 test5_entry_result = 0; +__u64 test5_exit_result = 0; + +SEC("fsession/bpf_fentry_test7") +int BPF_PROG(test5, struct bpf_fentry_test_t *arg, int ret) +{ + bool is_exit = bpf_session_is_return(ctx); + + if (!is_exit) { + if (!arg) + test5_entry_result = ret == 0; + return 0; + } + + if (!arg) + test5_exit_result = 1; + return 0; +} + +__u64 test6_entry_result = 0; +__u64 test6_exit_result = 0; +SEC("fsession/bpf_fentry_test1") +int BPF_PROG(test6, int a) +{ + __u64 addr = bpf_get_func_ip(ctx); + + if (bpf_session_is_return(ctx)) + test6_exit_result = (const void *) addr == &bpf_fentry_test1; + else + test6_entry_result = (const void *) addr == &bpf_fentry_test1; + return 0; +} -- 2.52.0