Commit d43029ff authored by Tao Chen's avatar Tao Chen Committed by Andrii Nakryiko
Browse files

selftests/bpf: Add stacktrace map lookup_and_delete_elem test case 



Add tests for stacktrace map lookup and delete:
1. use bpf_map_lookup_and_delete_elem to lookup and delete the target
   stack_id,
2. lookup the deleted stack_id again to double check.

Signed-off-by: default avatarTao Chen <chen.dylane@linux.dev>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250925175030.1615837-3-chen.dylane@linux.dev
parent 363b17e2

tools/testing/selftests/bpf/prog_tests/stacktrace_map.c

+10 −1
Original line number Diff line number Diff line
@@ -7,7 +7,8 @@ void test_stacktrace_map(void) 
	struct stacktrace_map *skel;

	int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;

	int err, stack_trace_len;

	__u32 key, val, duration = 0;

	__u32 key, val, stack_id, duration = 0;

	__u64 stack[PERF_MAX_STACK_DEPTH];



	skel = stacktrace_map__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
@@ -48,6 +49,14 @@ void test_stacktrace_map(void) 
		  "err %d errno %d\n", err, errno))

		goto out;



	stack_id = skel->bss->stack_id;

	err = bpf_map_lookup_and_delete_elem(stackmap_fd, &stack_id,  stack);

	if (!ASSERT_OK(err, "lookup and delete target stack_id"))

		goto out;



	err = bpf_map_lookup_elem(stackmap_fd, &stack_id, stack);

	if (!ASSERT_EQ(err, -ENOENT, "lookup deleted stack_id"))

		goto out;

out:

	stacktrace_map__destroy(skel);

}

tools/testing/selftests/bpf/progs/stacktrace_map.c

+2 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ struct sched_switch_args { 
	int next_prio;

};



__u32 stack_id;

SEC("tracepoint/sched/sched_switch")

int oncpu(struct sched_switch_args *ctx)

{
@@ -64,6 +65,7 @@ int oncpu(struct sched_switch_args *ctx) 
	/* The size of stackmap and stackid_hmap should be the same */

	key = bpf_get_stackid(ctx, &stackmap, 0);

	if ((int)key >= 0) {

		stack_id = key;

		bpf_map_update_elem(&stackid_hmap, &key, &val, 0);

		stack_p = bpf_map_lookup_elem(&stack_amap, &key);

		if (stack_p)