samples/bpf: unit test for BPF_MAP_TYPE_PERCPU_ARRAY

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>

1 files changed, 92 insertions, 0 deletions

diff --git a/samples/bpf/test_maps.c b/samples/bpf/test_maps.c
index 5f5fe5332148..ad466ed33093 100644
--- a/samples/bpf/test_maps.c
+++ b/samples/bpf/test_maps.c
@@ -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();