On 2026/1/24 11:31, Menglong Dong wrote:
> 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>
> ---
> .../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 | 31 ++++++++++++++++++-
> .../selftests/bpf/progs/get_func_ip_test.c | 14 +++++++++
> 4 files changed, 47 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..8ecc5f339552 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 +165,32 @@ int BPF_PROG(tp_test2)
>
> return 0;
> }
> +
> +__u64 test7_result = 0;
> +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;
> +}
CI failed, as this testcase can't run on !CONFIG_X86_64, and
"#ifdef __TARGET_ARCH_x86" should be used here.
Will send a V13 later :)
> 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..bd7598a037cd 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_exit_result = 0;
> +__u64 test9_entry_result = 0;
> +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;
> +}
>