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selftests/bpf: Test fentry link after tracing_multi link

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Verify that there's no any issue to attach tracing_multi link, then attach
fentry link.

Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20260711124822.29406-3-leon.hwang@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Leon Hwang 2026-07-11 20:48:22 +08:00 committed by Kumar Kartikeya Dwivedi
parent 30bdd6d138
commit 539d3edf8e
No known key found for this signature in database
GPG Key ID: 472D377B63542F83
2 changed files with 77 additions and 0 deletions
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69
tools/testing/selftests/bpf/prog_tests/tracing_multi.c
View File

@ -460,6 +460,73 @@ static void test_intersect(void)
tracing_multi_intersect__destroy(skel);
}
static void test_fentry_after_multi(void)
{
static const char * const funcs[] = {
"bpf_fentry_test1",
};
struct bpf_link *fentry_link = NULL, *multi_link = NULL;
struct tracing_multi_intersect *skel = NULL;
LIBBPF_OPTS(bpf_tracing_multi_opts, opts);
LIBBPF_OPTS(bpf_test_run_opts, topts);
__u32 *ids = NULL;
int err;
skel = tracing_multi_intersect__open_and_load();
if (!ASSERT_OK_PTR(skel, "tracing_multi_intersect__open_and_load"))
return;
skel->bss->pid = getpid();
ids = get_ids(funcs, ARRAY_SIZE(funcs), NULL);
if (!ASSERT_OK_PTR(ids, "get_ids"))
goto cleanup;
opts.ids = ids;
opts.cnt = ARRAY_SIZE(funcs);
multi_link = bpf_program__attach_tracing_multi(skel->progs.fentry_1, NULL, &opts);
if (!ASSERT_OK_PTR(multi_link, "attach_multi"))
goto cleanup;
fentry_link = bpf_program__attach(skel->progs.fentry);
if (!ASSERT_OK_PTR(fentry_link, "attach_fentry"))
goto cleanup;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts);
if (!ASSERT_OK(err, "test_run"))
goto cleanup;
ASSERT_EQ(skel->bss->test_result_fentry_1, 1, "multi_fentry");
ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry");
err = bpf_link__destroy(fentry_link);
fentry_link = NULL;
if (!ASSERT_OK(err, "destroy_fentry"))
goto cleanup;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts);
if (!ASSERT_OK(err, "test_run_multi"))
goto cleanup;
ASSERT_EQ(skel->bss->test_result_fentry_1, 2, "multi_fentry_only");
ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry_detached");
err = bpf_link__destroy(multi_link);
multi_link = NULL;
if (!ASSERT_OK(err, "destroy_multi"))
goto cleanup;
err = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.fentry_1), &topts);
if (!ASSERT_OK(err, "test_run_detached"))
goto cleanup;
ASSERT_EQ(skel->bss->test_result_fentry_1, 2, "multi_fentry_detached");
ASSERT_EQ(skel->bss->test_result_fentry, 1, "fentry_still_detached");
cleanup:
bpf_link__destroy(fentry_link);
bpf_link__destroy(multi_link);
free(ids);
tracing_multi_intersect__destroy(skel);
}
static void test_session(void)
{
LIBBPF_OPTS(bpf_test_run_opts, topts);
@ -957,4 +1024,6 @@ void test_tracing_multi_test(void)
if (test__start_subtest("attach_api_fails"))
test_attach_api_fails();
RUN_TESTS(tracing_multi_verifier);
if (test__start_subtest("fentry_after_multi"))
test_fentry_after_multi();
}

8
tools/testing/selftests/bpf/progs/tracing_multi_intersect_attach.c
View File

@ -11,6 +11,14 @@ __u64 test_result_fentry_1 = 0;
__u64 test_result_fentry_2 = 0;
__u64 test_result_fexit_1 = 0;
__u64 test_result_fexit_2 = 0;
__u64 test_result_fentry = 0;
SEC("fentry/bpf_fentry_test1")
int BPF_PROG(fentry)
{
tracing_multi_arg_check(ctx, &test_result_fentry, false);
return 0;
}
SEC("fentry.multi")
int BPF_PROG(fentry_1)