test/recvsend_bundle-inc: skip test on older kernels

If the kernel doesn't support IOU_PBUF_RING_INC, then just skip the
test case.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/recvsend_bundle-inc.c

diff --git a/test/recvsend_bundle-inc.c b/test/recvsend_bundle-inc.c
index ff39037..f48e26f 100644
--- a/test/recvsend_bundle-inc.c
+++ b/test/recvsend_bundle-inc.c
@@ -638,12 +638,39 @@
 	return ret;
 }
 
+static bool has_pbuf_ring_inc(void)
+{
+	struct io_uring_buf_ring *br;
+	bool has_pbuf_inc = false;
+	struct io_uring ring;
+	void *buf;
+	int ret;
+
+	ret = io_uring_queue_init(1, &ring, 0);
+	if (ret)
+		return false;
+
+	if (posix_memalign(&buf, 4096, MSG_SIZE * RECV_BIDS))
+		return false;
+
+	br = io_uring_setup_buf_ring(&ring, RECV_BIDS, RECV_BGID, IOU_PBUF_RING_INC, &ret);
+	if (br) {
+		has_pbuf_inc = true;
+		io_uring_unregister_buf_ring(&ring, RECV_BGID);
+	}
+	io_uring_queue_exit(&ring);
+	free(buf);
+	return has_pbuf_inc;
+}
+
 int main(int argc, char *argv[])
 {
 	int ret;
 
 	if (argc > 1)
 		return T_EXIT_SKIP;
+	if (!has_pbuf_ring_inc())
+		return T_EXIT_SKIP;
 
 	ret = test_tcp();
 	if (ret != T_EXIT_PASS)