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authorYonghong Song <yhs@fb.com>2020-07-23 11:41:21 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-07-25 20:16:34 -0700
commit60dd49ea65390986a665c462da704927e861e67e (patch)
tree5c4d32ab95660adde58cfe0aea34e857f1336cf3 /tools/testing/selftests/bpf/prog_tests/bpf_iter.c
parent2a7c2fff7dd6e87634e47ddb2d2c7f272708dbbf (diff)
downloadlwn-60dd49ea65390986a665c462da704927e861e67e.tar.gz
lwn-60dd49ea65390986a665c462da704927e861e67e.zip
selftests/bpf: Add test for bpf array map iterators
Two subtests are added. $ ./test_progs -n 4 ... #4/20 bpf_array_map:OK #4/21 bpf_percpu_array_map:OK ... The bpf_array_map subtest also tested bpf program changing array element values and send key/value to user space through bpf_seq_write() interface. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200723184121.591367-1-yhs@fb.com
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/bpf_iter.c')
-rw-r--r--tools/testing/selftests/bpf/prog_tests/bpf_iter.c161
1 files changed, 161 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 72790b600c62..4a02b2222a6d 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -17,6 +17,8 @@
#include "bpf_iter_test_kern4.skel.h"
#include "bpf_iter_bpf_hash_map.skel.h"
#include "bpf_iter_bpf_percpu_hash_map.skel.h"
+#include "bpf_iter_bpf_array_map.skel.h"
+#include "bpf_iter_bpf_percpu_array_map.skel.h"
static int duration;
@@ -638,6 +640,161 @@ out:
bpf_iter_bpf_percpu_hash_map__destroy(skel);
}
+static void test_bpf_array_map(void)
+{
+ __u64 val, expected_val = 0, res_first_val, first_val = 0;
+ DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
+ __u32 expected_key = 0, res_first_key;
+ struct bpf_iter_bpf_array_map *skel;
+ int err, i, map_fd, iter_fd;
+ struct bpf_link *link;
+ char buf[64] = {};
+ int len, start;
+
+ skel = bpf_iter_bpf_array_map__open_and_load();
+ if (CHECK(!skel, "bpf_iter_bpf_array_map__open_and_load",
+ "skeleton open_and_load failed\n"))
+ return;
+
+ map_fd = bpf_map__fd(skel->maps.arraymap1);
+ for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) {
+ val = i + 4;
+ expected_key += i;
+ expected_val += val;
+
+ if (i == 0)
+ first_val = val;
+
+ err = bpf_map_update_elem(map_fd, &i, &val, BPF_ANY);
+ if (CHECK(err, "map_update", "map_update failed\n"))
+ goto out;
+ }
+
+ opts.map_fd = map_fd;
+ link = bpf_program__attach_iter(skel->progs.dump_bpf_array_map, &opts);
+ if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
+ goto out;
+
+ iter_fd = bpf_iter_create(bpf_link__fd(link));
+ if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
+ goto free_link;
+
+ /* do some tests */
+ start = 0;
+ while ((len = read(iter_fd, buf + start, sizeof(buf) - start)) > 0)
+ start += len;
+ if (CHECK(len < 0, "read", "read failed: %s\n", strerror(errno)))
+ goto close_iter;
+
+ /* test results */
+ res_first_key = *(__u32 *)buf;
+ res_first_val = *(__u64 *)(buf + sizeof(__u32));
+ if (CHECK(res_first_key != 0 || res_first_val != first_val,
+ "bpf_seq_write",
+ "seq_write failure: first key %u vs expected 0, "
+ " first value %llu vs expected %llu\n",
+ res_first_key, res_first_val, first_val))
+ goto close_iter;
+
+ if (CHECK(skel->bss->key_sum != expected_key,
+ "key_sum", "got %u expected %u\n",
+ skel->bss->key_sum, expected_key))
+ goto close_iter;
+ if (CHECK(skel->bss->val_sum != expected_val,
+ "val_sum", "got %llu expected %llu\n",
+ skel->bss->val_sum, expected_val))
+ goto close_iter;
+
+ for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) {
+ err = bpf_map_lookup_elem(map_fd, &i, &val);
+ if (CHECK(err, "map_lookup", "map_lookup failed\n"))
+ goto out;
+ if (CHECK(i != val, "invalid_val",
+ "got value %llu expected %u\n", val, i))
+ goto out;
+ }
+
+close_iter:
+ close(iter_fd);
+free_link:
+ bpf_link__destroy(link);
+out:
+ bpf_iter_bpf_array_map__destroy(skel);
+}
+
+static void test_bpf_percpu_array_map(void)
+{
+ DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
+ struct bpf_iter_bpf_percpu_array_map *skel;
+ __u32 expected_key = 0, expected_val = 0;
+ int err, i, j, map_fd, iter_fd;
+ struct bpf_link *link;
+ char buf[64];
+ void *val;
+ int len;
+
+ val = malloc(8 * bpf_num_possible_cpus());
+
+ skel = bpf_iter_bpf_percpu_array_map__open();
+ if (CHECK(!skel, "bpf_iter_bpf_percpu_array_map__open",
+ "skeleton open failed\n"))
+ return;
+
+ skel->rodata->num_cpus = bpf_num_possible_cpus();
+
+ err = bpf_iter_bpf_percpu_array_map__load(skel);
+ if (CHECK(!skel, "bpf_iter_bpf_percpu_array_map__load",
+ "skeleton load failed\n"))
+ goto out;
+
+ /* update map values here */
+ map_fd = bpf_map__fd(skel->maps.arraymap1);
+ for (i = 0; i < bpf_map__max_entries(skel->maps.arraymap1); i++) {
+ expected_key += i;
+
+ for (j = 0; j < bpf_num_possible_cpus(); j++) {
+ *(__u32 *)(val + j * 8) = i + j;
+ expected_val += i + j;
+ }
+
+ err = bpf_map_update_elem(map_fd, &i, val, BPF_ANY);
+ if (CHECK(err, "map_update", "map_update failed\n"))
+ goto out;
+ }
+
+ opts.map_fd = map_fd;
+ link = bpf_program__attach_iter(skel->progs.dump_bpf_percpu_array_map, &opts);
+ if (CHECK(IS_ERR(link), "attach_iter", "attach_iter failed\n"))
+ goto out;
+
+ iter_fd = bpf_iter_create(bpf_link__fd(link));
+ if (CHECK(iter_fd < 0, "create_iter", "create_iter failed\n"))
+ goto free_link;
+
+ /* do some tests */
+ while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
+ ;
+ if (CHECK(len < 0, "read", "read failed: %s\n", strerror(errno)))
+ goto close_iter;
+
+ /* test results */
+ if (CHECK(skel->bss->key_sum != expected_key,
+ "key_sum", "got %u expected %u\n",
+ skel->bss->key_sum, expected_key))
+ goto close_iter;
+ if (CHECK(skel->bss->val_sum != expected_val,
+ "val_sum", "got %u expected %u\n",
+ skel->bss->val_sum, expected_val))
+ goto close_iter;
+
+close_iter:
+ close(iter_fd);
+free_link:
+ bpf_link__destroy(link);
+out:
+ bpf_iter_bpf_percpu_array_map__destroy(skel);
+}
+
void test_bpf_iter(void)
{
if (test__start_subtest("btf_id_or_null"))
@@ -678,4 +835,8 @@ void test_bpf_iter(void)
test_bpf_hash_map();
if (test__start_subtest("bpf_percpu_hash_map"))
test_bpf_percpu_hash_map();
+ if (test__start_subtest("bpf_array_map"))
+ test_bpf_array_map();
+ if (test__start_subtest("bpf_percpu_array_map"))
+ test_bpf_percpu_array_map();
}