Commit 7eab3a58 authored by Tao Chen's avatar Tao Chen Committed by Andrii Nakryiko
Browse files

bpf/selftests: Check errno when percpu map value size exceeds 



This test case checks the errno message when percpu map value size
exceeds PCPU_MIN_UNIT_SIZE.

root@debian:~# ./test_maps
...
test_map_percpu_stats_hash_of_maps:PASS
test_map_percpu_stats_map_value_size:PASS
test_sk_storage_map:PASS

Signed-off-by: default avatarJinke Han <jinkehan@didiglobal.com>
Signed-off-by: default avatarTao Chen <chen.dylane@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240910144111.1464912-3-chen.dylane@gmail.com
parent 1d244784

tools/testing/selftests/bpf/map_tests/map_percpu_stats.c

+18 −0
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#define MAX_ENTRIES_HASH_OF_MAPS	64

#define N_THREADS			8

#define MAX_MAP_KEY_SIZE		4

#define PCPU_MIN_UNIT_SIZE		32768



static void map_info(int map_fd, struct bpf_map_info *info)

{
@@ -456,6 +457,22 @@ static void map_percpu_stats_hash_of_maps(void) 
	printf("test_%s:PASS\n", __func__);

}



static void map_percpu_stats_map_value_size(void)

{

	int fd;

	int value_sz = PCPU_MIN_UNIT_SIZE + 1;

	struct bpf_map_create_opts opts = { .sz = sizeof(opts) };

	enum bpf_map_type map_types[] = { BPF_MAP_TYPE_PERCPU_ARRAY,

					  BPF_MAP_TYPE_PERCPU_HASH,

					  BPF_MAP_TYPE_LRU_PERCPU_HASH };

	for (int i = 0; i < ARRAY_SIZE(map_types); i++) {

		fd = bpf_map_create(map_types[i], NULL, sizeof(__u32), value_sz, 1, &opts);

		CHECK(fd < 0 && errno != E2BIG, "percpu map value size",

			"error: %s\n", strerror(errno));

	}

	printf("test_%s:PASS\n", __func__);

}



void test_map_percpu_stats(void)

{

	map_percpu_stats_hash();
@@ -467,4 +484,5 @@ void test_map_percpu_stats(void) 
	map_percpu_stats_percpu_lru_hash();

	map_percpu_stats_percpu_lru_hash_no_common();

	map_percpu_stats_hash_of_maps();

	map_percpu_stats_map_value_size();

}