From: Hou Tao <houtao1@xxxxxxxxxx>
When updating per-cpu map in map_percpu_stats test, patch_map_thread()
only passes 4-bytes-sized value to bpf_map_update_elem(). The expected
size of the value is 8 * num_possible_cpus(), so fix it by passing a
value with enough-size for per-cpu map update.
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
.../bpf/map_tests/map_percpu_stats.c | 21 ++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
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 1a9eeefda9a87..8ad17d051ef8f 100644
--- a/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
+++ b/tools/testing/selftests/bpf/map_tests/map_percpu_stats.c
@@ -131,6 +131,12 @@ static bool is_lru(__u32 map_type)
map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH;
}
+static bool is_percpu(__u32 map_type)
+{
+ return map_type == BPF_MAP_TYPE_PERCPU_HASH ||
+ map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH;
+}
+
struct upsert_opts {
__u32 map_type;
int map_fd;
@@ -150,17 +156,26 @@ static int create_small_hash(void)
static void *patch_map_thread(void *arg)
{
+ /* 8KB is enough for 1024 CPUs. And it is shared between N_THREADS. */
+ static __u8 blob[8 << 10];
struct upsert_opts *opts = arg;
+ void *val_ptr;
int val;
int ret;
int i;
for (i = 0; i < opts->n; i++) {
- if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
+ if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
val = create_small_hash();
- else
+ val_ptr = &val;
+ } else if (is_percpu(opts->map_type)) {
+ val_ptr = blob;
+ } else {
val = rand();
- ret = bpf_map_update_elem(opts->map_fd, &i, &val, 0);
+ val_ptr = &val;
+ }
+
+ ret = bpf_map_update_elem(opts->map_fd, &i, val_ptr, 0);
CHECK(ret < 0, "bpf_map_update_elem", "key=%d error: %s\n", i, strerror(errno));
if (opts->map_type == BPF_MAP_TYPE_HASH_OF_MAPS)
--
2.29.2
