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selftests/bpf: Add link info test for ref_ctr_offset retrieval

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Adding link info test for ref_ctr_offset retrieval for both
uprobe and uretprobe probes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/bpf/20250509153539.779599-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa
2025-05-09 17:35:38 +02:00
committed by Andrii Nakryiko
parent 8231533340
commit d57293db64
1 changed files with 16 additions and 2 deletions
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18
tools/testing/selftests/bpf/prog_tests/fill_link_info.c
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@@ -37,6 +37,7 @@ static noinline void uprobe_func(void)
static int verify_perf_link_info(int fd, enum bpf_perf_event_type type, long addr,
ssize_t offset, ssize_t entry_offset)
{
ssize_t ref_ctr_offset = entry_offset /* ref_ctr_offset for uprobes */;
struct bpf_link_info info;
__u32 len = sizeof(info);
char buf[PATH_MAX];
@@ -97,6 +98,7 @@ static int verify_perf_link_info(int fd, enum bpf_perf_event_type type, long add
case BPF_PERF_EVENT_UPROBE:
case BPF_PERF_EVENT_URETPROBE:
ASSERT_EQ(info.perf_event.uprobe.offset, offset, "uprobe_offset");
ASSERT_EQ(info.perf_event.uprobe.ref_ctr_offset, ref_ctr_offset, "uprobe_ref_ctr_offset");
ASSERT_EQ(info.perf_event.uprobe.name_len, strlen(UPROBE_FILE) + 1,
"name_len");
@@ -241,20 +243,32 @@ static void test_uprobe_fill_link_info(struct test_fill_link_info *skel,
.retprobe = type == BPF_PERF_EVENT_URETPROBE,
.bpf_cookie = PERF_EVENT_COOKIE,
);
const char *sema[1] = {
"uprobe_link_info_sema_1",
};
__u64 *ref_ctr_offset;
struct bpf_link *link;
int link_fd, err;
err = elf_resolve_syms_offsets("/proc/self/exe", 1, sema,
(unsigned long **) &ref_ctr_offset, STT_OBJECT);
if (!ASSERT_OK(err, "elf_resolve_syms_offsets_object"))
return;
opts.ref_ctr_offset = *ref_ctr_offset;
link = bpf_program__attach_uprobe_opts(skel->progs.uprobe_run,
0, /* self pid */
UPROBE_FILE, uprobe_offset,
&opts);
if (!ASSERT_OK_PTR(link, "attach_uprobe"))
return;
goto out;
link_fd = bpf_link__fd(link);
err = verify_perf_link_info(link_fd, type, 0, uprobe_offset, 0);
err = verify_perf_link_info(link_fd, type, 0, uprobe_offset, *ref_ctr_offset);
ASSERT_OK(err, "verify_perf_link_info");
bpf_link__destroy(link);
out:
free(ref_ctr_offset);
}
static int verify_kmulti_link_info(int fd, bool retprobe, bool has_cookies)