[PATCH bpf-next v3 5/5] selftest/bpf: The test cses of BPF cookie for fentry/fexit/fmod_ret.

[Kui-Feng Lee <kuifeng@xxxxxx>]

Make sure BPF cookies are correct for fentry/fexit/fmod_ret.

Signed-off-by: Kui-Feng Lee <kuifeng@xxxxxx>
---
 .../selftests/bpf/prog_tests/bpf_cookie.c     | 52 +++++++++++++++++++
 .../selftests/bpf/progs/test_bpf_cookie.c     | 24 +++++++++
 2 files changed, 76 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
index 0612e79a9281..16385f0c4031 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_cookie.c
@@ -237,6 +237,56 @@ static void pe_subtest(struct test_bpf_cookie *skel)
 	bpf_link__destroy(link);
 }
 
+static void tracing_subtest(struct test_bpf_cookie *skel)
+{
+	__u64 cookie;
+	int prog_fd;
+	int fentry_fd = -1, fexit_fd = -1, fmod_ret_fd = -1;
+
+	LIBBPF_OPTS(bpf_test_run_opts, opts, .repeat = 1);
+	LIBBPF_OPTS(bpf_link_create_opts, link_opts);
+
+	skel->bss->fentry_res = 0;
+	skel->bss->fexit_res = 0;
+
+	cookie = 0x100000;
+	prog_fd = bpf_program__fd(skel->progs.fentry_test1);
+	link_opts.tracing.bpf_cookie = cookie;
+	fentry_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FENTRY, &link_opts);
+
+	cookie = 0x200000;
+	prog_fd = bpf_program__fd(skel->progs.fexit_test1);
+	link_opts.tracing.bpf_cookie = cookie;
+	fexit_fd = bpf_link_create(prog_fd, 0, BPF_TRACE_FEXIT, &link_opts);
+	if (!ASSERT_GE(fexit_fd, 0, "fexit.open"))
+		goto cleanup;
+
+	cookie = 0x300000;
+	prog_fd = bpf_program__fd(skel->progs.fmod_ret_test);
+	link_opts.tracing.bpf_cookie = cookie;
+	fmod_ret_fd = bpf_link_create(prog_fd, 0, BPF_MODIFY_RETURN, &link_opts);
+	if (!ASSERT_GE(fmod_ret_fd, 0, "fmod_ret.opoen"))
+		goto cleanup;
+
+	prog_fd = bpf_program__fd(skel->progs.fentry_test1);
+	bpf_prog_test_run_opts(prog_fd, &opts);
+
+	prog_fd = bpf_program__fd(skel->progs.fmod_ret_test);
+	bpf_prog_test_run_opts(prog_fd, &opts);
+
+	ASSERT_EQ(skel->bss->fentry_res, 0x100000, "fentry_res");
+	ASSERT_EQ(skel->bss->fexit_res, 0x200000, "fexit_res");
+	ASSERT_EQ(skel->bss->fmod_ret_res, 0x300000, "fmod_ret_res");
+
+cleanup:
+	if (fentry_fd >= 0)
+		close(fentry_fd);
+	if (fexit_fd >= 0)
+		close(fexit_fd);
+	if (fmod_ret_fd >= 0)
+		close(fmod_ret_fd);
+}
+
 void test_bpf_cookie(void)
 {
 	struct test_bpf_cookie *skel;
@@ -255,6 +305,8 @@ void test_bpf_cookie(void)
 		tp_subtest(skel);
 	if (test__start_subtest("perf_event"))
 		pe_subtest(skel);
+	if (test__start_subtest("trampoline"))
+		tracing_subtest(skel);
 
 	test_bpf_cookie__destroy(skel);
 }
diff --git a/tools/testing/selftests/bpf/progs/test_bpf_cookie.c b/tools/testing/selftests/bpf/progs/test_bpf_cookie.c
index 2d3a7710e2ce..a9f83f46e7b7 100644
--- a/tools/testing/selftests/bpf/progs/test_bpf_cookie.c
+++ b/tools/testing/selftests/bpf/progs/test_bpf_cookie.c
@@ -14,6 +14,9 @@ int uprobe_res;
 int uretprobe_res;
 int tp_res;
 int pe_res;
+int fentry_res;
+int fexit_res;
+int fmod_ret_res;
 
 static void update(void *ctx, int *res)
 {
@@ -82,4 +85,25 @@ int handle_pe(struct pt_regs *ctx)
 	return 0;
 }
 
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(fentry_test1, int a)
+{
+	update(ctx, &fentry_res);
+	return 0;
+}
+
+SEC("fexit/bpf_fentry_test1")
+int BPF_PROG(fexit_test1, int a, int ret)
+{
+	update(ctx, &fexit_res);
+	return 0;
+}
+
+SEC("fmod_ret/bpf_modify_return_test")
+int BPF_PROG(fmod_ret_test, int _a, int *_b, int _ret)
+{
+	update(ctx, &fmod_ret_res);
+	return 1234;
+}
+
 char _license[] SEC("license") = "GPL";
-- 
2.30.2