netdev - [PATCH bpf-next v13 11/13] selftests/bpf: test bpf_get_func

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Message-ID: <20260124062008.8657-12-dongml2@chinatelecom.cn>
Date: Sat, 24 Jan 2026 14:20:06 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: andrii@...nel.org
Cc: ast@...nel.org,
	daniel@...earbox.net,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	davem@...emloft.net,
	dsahern@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	jiang.biao@...ux.dev,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v13 11/13] selftests/bpf: test bpf_get_func_* for fsession

Test following bpf helper for fsession:
  bpf_get_func_arg()
  bpf_get_func_arg_cnt()
  bpf_get_func_ret()
  bpf_get_func_ip()

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
v13:
- fix the selftests fail on !x86_64
---
 .../bpf/prog_tests/get_func_args_test.c       |  1 +
 .../bpf/prog_tests/get_func_ip_test.c         |  2 +
 .../selftests/bpf/progs/get_func_args_test.c  | 40 ++++++++++++++++++-
 .../selftests/bpf/progs/get_func_ip_test.c    | 23 +++++++++++
 4 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c b/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
index fadee95d3ae8..96b27de05524 100644
--- a/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
+++ b/tools/testing/selftests/bpf/prog_tests/get_func_args_test.c
@@ -41,6 +41,7 @@ void test_get_func_args_test(void)
 	ASSERT_EQ(skel->bss->test4_result, 1, "test4_result");
 	ASSERT_EQ(skel->bss->test5_result, 1, "test5_result");
 	ASSERT_EQ(skel->bss->test6_result, 1, "test6_result");
+	ASSERT_EQ(skel->bss->test7_result, 1, "test7_result");
 
 cleanup:
 	get_func_args_test__destroy(skel);
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..7772a0f288d3 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_entry_result, 1, "test9_entry_result");
+	ASSERT_EQ(skel->bss->test9_exit_result, 1, "test9_exit_result");
 
 cleanup:
 	get_func_ip_test__destroy(skel);
diff --git a/tools/testing/selftests/bpf/progs/get_func_args_test.c b/tools/testing/selftests/bpf/progs/get_func_args_test.c
index 5b7233afef05..0a3236a7a109 100644
--- a/tools/testing/selftests/bpf/progs/get_func_args_test.c
+++ b/tools/testing/selftests/bpf/progs/get_func_args_test.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/bpf.h>
+#include <vmlinux.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <errno.h>
@@ -165,3 +165,41 @@ int BPF_PROG(tp_test2)
 
 	return 0;
 }
+
+__u64 test7_result = 0;
+#ifdef __TARGET_ARCH_x86
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test7)
+{
+	__u64 cnt = bpf_get_func_arg_cnt(ctx);
+	__u64 a = 0, z = 0, ret = 0;
+	__s64 err;
+
+	test7_result = cnt == 1;
+
+	/* valid arguments */
+	err = bpf_get_func_arg(ctx, 0, &a);
+	test7_result &= err == 0 && ((int) a == 1);
+
+	/* not valid argument */
+	err = bpf_get_func_arg(ctx, 1, &z);
+	test7_result &= err == -EINVAL;
+
+	if (bpf_session_is_return(ctx)) {
+		err = bpf_get_func_ret(ctx, &ret);
+		test7_result &= err == 0 && ret == 2;
+	} else {
+		err = bpf_get_func_ret(ctx, &ret);
+		test7_result &= err == 0 && ret == 0;
+	}
+
+	return 0;
+}
+#else
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(test7)
+{
+	test7_result = 1;
+	return 0;
+}
+#endif
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..65f7e1f182bf 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 +103,26 @@ int BPF_URETPROBE(test8, int ret)
 	test8_result = (const void *) addr == (const void *) uprobe_trigger;
 	return 0;
 }
+
+__u64 test9_entry_result = 0;
+__u64 test9_exit_result = 0;
+#ifdef __TARGET_ARCH_x86
+SEC("fsession/bpf_fentry_test1")
+int BPF_PROG(test9, int a)
+{
+	__u64 addr = bpf_get_func_ip(ctx);
+
+	if (bpf_session_is_return(ctx))
+		test9_exit_result = (const void *) addr == &bpf_fentry_test1;
+	else
+		test9_entry_result = (const void *) addr == &bpf_fentry_test1;
+	return 0;
+}
+#else
+SEC("fentry/bpf_fentry_test1")
+int BPF_PROG(test9, int a)
+{
+	test9_entry_result = test9_exit_result = 1;
+	return 0;
+}
+#endif
-- 
2.52.0