linux-kernel - [PATCH bpf-next v2 07/10] selftests/bpf: test get_func

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Message-ID: <20251022080159.553805-8-dongml2@chinatelecom.cn>
Date: Wed, 22 Oct 2025 16:01:56 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org,
	jolsa@...nel.org
Cc: daniel@...earbox.net,
	john.fastabend@...il.com,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	mattbobrowski@...gle.com,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	leon.hwang@...ux.dev,
	jiang.biao@...ux.dev,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH bpf-next v2 07/10] selftests/bpf: test get_func_ip for fsession

As the layout of the stack changed for fsession, we'd better test
bpf_get_func_ip() for it.

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 .../selftests/bpf/prog_tests/get_func_ip_test.c    |  2 ++
 .../testing/selftests/bpf/progs/get_func_ip_test.c | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
index c40242dfa8fb..a9078a1dbb07 100644
--- a/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
@@ -46,6 +46,8 @@ static void test_function_entry(void)
 	ASSERT_EQ(skel->bss->test5_result, 1, "test5_result");
 	ASSERT_EQ(skel->bss->test7_result, 1, "test7_result");
 	ASSERT_EQ(skel->bss->test8_result, 1, "test8_result");
+	ASSERT_EQ(skel->bss->test9_result1, 1, "test9_result1");
+	ASSERT_EQ(skel->bss->test9_result2, 1, "test9_result2");
 
 cleanup:
 	get_func_ip_test__destroy(skel);
diff --git a/tools/testing/selftests/bpf/progs/get_func_ip_test.c b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
index 2011cacdeb18..9acb79fc7537 100644
--- a/tools/testing/selftests/bpf/progs/get_func_ip_test.c
+++ b/tools/testing/selftests/bpf/progs/get_func_ip_test.c
@@ -103,3 +103,17 @@ int BPF_URETPROBE(test8, int ret)
 	test8_result = (const void *) addr == (const void *) uprobe_trigger;
 	return 0;
 }
+
+__u64 test9_result1 = 0;
+__u64 test9_result2 = 0;
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test9, int a)
+{
+	__u64 addr = bpf_get_func_ip(ctx);
+
+	if (bpf_tracing_is_exit(ctx))
+		test9_result1 = (const void *) addr == &bpf_fentry_test1;
+	else
+		test9_result2 = (const void *) addr == &bpf_fentry_test1;
+	return 0;
+}
-- 
2.51.1.dirty