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: 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

diff --git a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
index 2ea36408816be071c7b1459d392c97db8ce1bd01..1c7c04288eff4e8b65b99d69f5be6031bc798cbe 100644 (file)
--- a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
+++ b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
@@ -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();
 }