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@chinatelecom.cn>
Link: https://lore.kernel.org/r/20260124062008.8657-12-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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 fadee95d3ae8494a823ab95f8c6935137457457f..96b27de055246b025f4a68e841b1a94054ddd93b 100644 (file)
--- 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 c40242dfa8fb5fa049c31b4dcd572940aa2f4cbb..7772a0f288d305222fa785a693a4e94f88e9c846 100644 (file)
--- 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 5b7233afef0536ba21788531ff02acea64f32b4a..0a3236a7a1097ab4f20773ee0ff469315b7d862b 100644 (file)
--- 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 2011cacdeb183c2cdde678970779a44502f40a67..65f7e1f182bfe0e816f81d6949841a63ffdcfeb3 100644 (file)
--- 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