selftests/bpf: Add tests for ring__map_fd

Add tests for the new API ring__map_fd.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-13-martin.kelly@crowdstrike.com

diff --git a/tools/testing/selftests/bpf/prog_tests/ringbuf.c b/tools/testing/selftests/bpf/prog_tests/ringbuf.c
index c5be480a6ef625a808294b364568f4a28e247e06..c23f6c54b37374ad3a01378b1d7d42c663918131 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/ringbuf.c
+++ b/tools/testing/selftests/bpf/prog_tests/ringbuf.c
@@ -92,6 +92,7 @@ static void ringbuf_subtest(void)
        int page_size = getpagesize();
        void *mmap_ptr, *tmp_ptr;
        struct ring *ring;
+       int map_fd;
        unsigned long avail_data, ring_size, cons_pos, prod_pos;
 
        skel = test_ringbuf_lskel__open();
@@ -168,6 +169,9 @@ static void ringbuf_subtest(void)
        if (!ASSERT_OK_PTR(ring, "ring_buffer__ring_idx_0"))
                goto cleanup;
 
+       map_fd = ring__map_fd(ring);
+       ASSERT_EQ(map_fd, skel->maps.ringbuf.map_fd, "ring_map_fd");
+
        /* 2 submitted + 1 discarded records */
        CHECK(skel->bss->avail_data != 3 * rec_sz,
              "err_avail_size", "exp %ld, got %ld\n",