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selftests/bpf: Add bpf_{update, delete}_map_elem in hashmap iter program 

Added bpf_{updata,delete}_map_elem to the very map element the
iter program is visiting. Due to rcu protection, the visited map
elements, although stale, should still contain correct values.
  $ ./test_progs -n 4/18
  #4/18 bpf_hash_map:OK
  #4 bpf_iter:OK
  Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200902235341.2001534-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2020-09-02 16:53:41 -07:00 committed by Alexei Starovoitov
parent dc0988bbe1
commit 4daab71327
1 changed files with 15 additions and 0 deletions
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15
tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c
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@ -47,7 +47,10 @@ int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)
__u32 seq_num = ctx->meta->seq_num;
struct bpf_map *map = ctx->map;
struct key_t *key = ctx->key;
struct key_t tmp_key;
__u64 *val = ctx->value;
__u64 tmp_val = 0;
int ret;
if (in_test_mode) {
/* test mode is used by selftests to
@ -61,6 +64,18 @@ int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)
if (key == (void *)0 || val == (void *)0)
return 0;
/* update the value and then delete the <key, value> pair.
* it should not impact the existing 'val' which is still
* accessible under rcu.
*/
__builtin_memcpy(&tmp_key, key, sizeof(struct key_t));
ret = bpf_map_update_elem(&hashmap1, &tmp_key, &tmp_val, 0);
if (ret)
return 0;
ret = bpf_map_delete_elem(&hashmap1, &tmp_key);
if (ret)
return 0;
key_sum_a += key->a;
key_sum_b += key->b;
key_sum_c += key->c;