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samples/bpf: unit test for BPF_MAP_TYPE_PERCPU_ARRAY

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A sanity test for BPF_MAP_TYPE_PERCPU_ARRAY

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
tom.leiming@gmail.com 2016-02-01 22:39:57 -08:00 committed by David S. Miller
parent e155967179
commit df570f5772
1 changed files with 92 additions and 0 deletions
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92
samples/bpf/test_maps.c
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@ -236,6 +236,94 @@ static void test_arraymap_sanity(int i, void *data)
close(map_fd);
}
static void test_percpu_arraymap_many_keys(void)
{
unsigned nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
unsigned nr_keys = 20000;
long values[nr_cpus];
int key, map_fd, i;
map_fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key),
sizeof(values[0]), nr_keys);
if (map_fd < 0) {
printf("failed to create per-cpu arraymap '%s'\n",
strerror(errno));
exit(1);
}
for (i = 0; i < nr_cpus; i++)
values[i] = i + 10;
for (key = 0; key < nr_keys; key++)
assert(bpf_update_elem(map_fd, &key, values, BPF_ANY) == 0);
for (key = 0; key < nr_keys; key++) {
for (i = 0; i < nr_cpus; i++)
values[i] = 0;
assert(bpf_lookup_elem(map_fd, &key, values) == 0);
for (i = 0; i < nr_cpus; i++)
assert(values[i] == i + 10);
}
close(map_fd);
}
static void test_percpu_arraymap_sanity(int i, void *data)
{
unsigned nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
long values[nr_cpus];
int key, next_key, map_fd;
map_fd = bpf_create_map(BPF_MAP_TYPE_PERCPU_ARRAY, sizeof(key),
sizeof(values[0]), 2);
if (map_fd < 0) {
printf("failed to create arraymap '%s'\n", strerror(errno));
exit(1);
}
for (i = 0; i < nr_cpus; i++)
values[i] = i + 100;
key = 1;
/* insert key=1 element */
assert(bpf_update_elem(map_fd, &key, values, BPF_ANY) == 0);
values[0] = 0;
assert(bpf_update_elem(map_fd, &key, values, BPF_NOEXIST) == -1 &&
errno == EEXIST);
/* check that key=1 can be found */
assert(bpf_lookup_elem(map_fd, &key, values) == 0 && values[0] == 100);
key = 0;
/* check that key=0 is also found and zero initialized */
assert(bpf_lookup_elem(map_fd, &key, values) == 0 &&
values[0] == 0 && values[nr_cpus - 1] == 0);
/* check that key=2 cannot be inserted due to max_entries limit */
key = 2;
assert(bpf_update_elem(map_fd, &key, values, BPF_EXIST) == -1 &&
errno == E2BIG);
/* check that key = 2 doesn't exist */
assert(bpf_lookup_elem(map_fd, &key, values) == -1 && errno == ENOENT);
/* iterate over two elements */
assert(bpf_get_next_key(map_fd, &key, &next_key) == 0 &&
next_key == 0);
assert(bpf_get_next_key(map_fd, &next_key, &next_key) == 0 &&
next_key == 1);
assert(bpf_get_next_key(map_fd, &next_key, &next_key) == -1 &&
errno == ENOENT);
/* delete shouldn't succeed */
key = 1;
assert(bpf_delete_elem(map_fd, &key) == -1 && errno == EINVAL);
close(map_fd);
}
#define MAP_SIZE (32 * 1024)
static void test_map_large(void)
{
@ -305,6 +393,7 @@ static void test_map_stress(void)
run_parallel(100, test_hashmap_sanity, NULL);
run_parallel(100, test_percpu_hashmap_sanity, NULL);
run_parallel(100, test_arraymap_sanity, NULL);
run_parallel(100, test_percpu_arraymap_sanity, NULL);
}
#define TASKS 1024
@ -379,6 +468,9 @@ int main(void)
test_hashmap_sanity(0, NULL);
test_percpu_hashmap_sanity(0, NULL);
test_arraymap_sanity(0, NULL);
test_percpu_arraymap_sanity(0, NULL);
test_percpu_arraymap_many_keys();
test_map_large();
test_map_parallel();
test_map_stress();