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selftests/bpf: test bpf_get_func_* for fsession

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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>
This commit is contained in:
Menglong Dong
2026-01-24 14:20:06 +08:00
committed by Alexei Starovoitov
parent f7afef5617
commit a5533a6eaa
4 changed files with 65 additions and 1 deletions
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40
tools/testing/selftests/bpf/progs/get_func_args_test.c
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@@ -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