selftests/bpf: Add tests for ring__avail_data_size

Add test for the new API ring__avail_data_size.

Signed-off-by: Martin Kelly <martin.kelly@crowdstrike.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20230925215045.2375758-9-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 994a36a2b5893c6b93e45ca8aacfc0a0460695e5..254b25b8614cf427f246f5157735ff81e3574e79 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/ringbuf.c
+++ b/tools/testing/selftests/bpf/prog_tests/ringbuf.c
@@ -92,7 +92,7 @@ static void ringbuf_subtest(void)
        int page_size = getpagesize();
        void *mmap_ptr, *tmp_ptr;
        struct ring *ring;
-       unsigned long cons_pos, prod_pos;
+       unsigned long avail_data, cons_pos, prod_pos;
 
        skel = test_ringbuf_lskel__open();
        if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
@@ -185,6 +185,8 @@ static void ringbuf_subtest(void)
        /* verify getting this data directly via the ring object yields the same
         * results
         */
+       avail_data = ring__avail_data_size(ring);
+       ASSERT_EQ(avail_data, 3 * rec_sz, "ring_avail_size");
        cons_pos = ring__consumer_pos(ring);
        ASSERT_EQ(cons_pos, 0, "ring_cons_pos");
        prod_pos = ring__producer_pos(ring);