diff options
Diffstat (limited to 'tools/testing/selftests/bpf/test_map_lock.c')
-rw-r--r-- | tools/testing/selftests/bpf/test_map_lock.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_map_lock.c b/tools/testing/selftests/bpf/test_map_lock.c new file mode 100644 index 000000000000..af8cc68ed2f9 --- /dev/null +++ b/tools/testing/selftests/bpf/test_map_lock.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook +#include <linux/bpf.h> +#include <linux/version.h> +#include "bpf_helpers.h" + +#define VAR_NUM 16 + +struct hmap_elem { + struct bpf_spin_lock lock; + int var[VAR_NUM]; +}; + +struct bpf_map_def SEC("maps") hash_map = { + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(int), + .value_size = sizeof(struct hmap_elem), + .max_entries = 1, +}; + +BPF_ANNOTATE_KV_PAIR(hash_map, int, struct hmap_elem); + +struct array_elem { + struct bpf_spin_lock lock; + int var[VAR_NUM]; +}; + +struct bpf_map_def SEC("maps") array_map = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(int), + .value_size = sizeof(struct array_elem), + .max_entries = 1, +}; + +BPF_ANNOTATE_KV_PAIR(array_map, int, struct array_elem); + +SEC("map_lock_demo") +int bpf_map_lock_test(struct __sk_buff *skb) +{ + struct hmap_elem zero = {}, *val; + int rnd = bpf_get_prandom_u32(); + int key = 0, err = 1, i; + struct array_elem *q; + + val = bpf_map_lookup_elem(&hash_map, &key); + if (!val) + goto err; + /* spin_lock in hash map */ + bpf_spin_lock(&val->lock); + for (i = 0; i < VAR_NUM; i++) + val->var[i] = rnd; + bpf_spin_unlock(&val->lock); + + /* spin_lock in array */ + q = bpf_map_lookup_elem(&array_map, &key); + if (!q) + goto err; + bpf_spin_lock(&q->lock); + for (i = 0; i < VAR_NUM; i++) + q->var[i] = rnd; + bpf_spin_unlock(&q->lock); + err = 0; +err: + return err; +} +char _license[] SEC("license") = "GPL"; |