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

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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: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Tao Chen <chen.dylane@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240910144111.1464912-3-chen.dylane@gmail.com
This commit is contained in:
Tao Chen 2024-09-10 22:41:11 +08:00 committed by Andrii Nakryiko
parent 1d244784be
commit 7eab3a58ac
1 changed files with 18 additions and 0 deletions
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18
tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
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@ -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();
}