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Subject[PATCH bpf-next v2 2/4] selftests: bpf: Add helper to compare socket cookies
Date
We compare socket cookies to ensure that insertion into a sockmap worked.
Pull this out into a helper function for use in other tests.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
.../selftests/bpf/prog_tests/sockmap_basic.c | 50 +++++++++++++------
1 file changed, 36 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
index 4b7a527e7e82..67d3301bdf81 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
@@ -50,6 +50,37 @@ static int connected_socket_v4(void)
return -1;
}

+static void compare_cookies(struct bpf_map *src, struct bpf_map *dst)
+{
+ __u32 i, max_entries = bpf_map__max_entries(src);
+ int err, duration, src_fd, dst_fd;
+
+ src_fd = bpf_map__fd(src);
+ dst_fd = bpf_map__fd(dst);
+
+ for (i = 0; i < max_entries; i++) {
+ __u64 src_cookie, dst_cookie;
+
+ err = bpf_map_lookup_elem(src_fd, &i, &src_cookie);
+ if (err && errno == ENOENT) {
+ err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
+ CHECK(!err, "map_lookup_elem(dst)", "element %u not deleted\n", i);
+ CHECK(err && errno != ENOENT, "map_lookup_elem(dst)", "%s\n",
+ strerror(errno));
+ continue;
+ }
+ if (CHECK(err, "lookup_elem(src)", "%s\n", strerror(errno)))
+ continue;
+
+ err = bpf_map_lookup_elem(dst_fd, &i, &dst_cookie);
+ if (CHECK(err, "lookup_elem(dst)", "%s\n", strerror(errno)))
+ continue;
+
+ CHECK(dst_cookie != src_cookie, "cookie mismatch",
+ "%llu != %llu (pos %u)\n", dst_cookie, src_cookie, i);
+ }
+}
+
/* Create a map, populate it with one socket, and free the map. */
static void test_sockmap_create_update_free(enum bpf_map_type map_type)
{
@@ -109,9 +140,9 @@ static void test_skmsg_helpers(enum bpf_map_type map_type)
static void test_sockmap_update(enum bpf_map_type map_type)
{
struct bpf_prog_test_run_attr tattr;
- int err, prog, src, dst, duration = 0;
+ int err, prog, src, duration = 0;
struct test_sockmap_update *skel;
- __u64 src_cookie, dst_cookie;
+ struct bpf_map *dst_map;
const __u32 zero = 0;
char dummy[14] = {0};
__s64 sk;
@@ -127,18 +158,14 @@ static void test_sockmap_update(enum bpf_map_type map_type)
prog = bpf_program__fd(skel->progs.copy_sock_map);
src = bpf_map__fd(skel->maps.src);
if (map_type == BPF_MAP_TYPE_SOCKMAP)
- dst = bpf_map__fd(skel->maps.dst_sock_map);
+ dst_map = skel->maps.dst_sock_map;
else
- dst = bpf_map__fd(skel->maps.dst_sock_hash);
+ dst_map = skel->maps.dst_sock_hash;

err = bpf_map_update_elem(src, &zero, &sk, BPF_NOEXIST);
if (CHECK(err, "update_elem(src)", "errno=%u\n", errno))
goto out;

- err = bpf_map_lookup_elem(src, &zero, &src_cookie);
- if (CHECK(err, "lookup_elem(src, cookie)", "errno=%u\n", errno))
- goto out;
-
tattr = (struct bpf_prog_test_run_attr){
.prog_fd = prog,
.repeat = 1,
@@ -151,12 +178,7 @@ static void test_sockmap_update(enum bpf_map_type map_type)
"errno=%u retval=%u\n", errno, tattr.retval))
goto out;

- err = bpf_map_lookup_elem(dst, &zero, &dst_cookie);
- if (CHECK(err, "lookup_elem(dst, cookie)", "errno=%u\n", errno))
- goto out;
-
- CHECK(dst_cookie != src_cookie, "cookie mismatch", "%llu != %llu\n",
- dst_cookie, src_cookie);
+ compare_cookies(skel->maps.src, dst_map);

out:
test_sockmap_update__destroy(skel);
--
2.25.1
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