@@ -671,6 +671,69 @@ test_enqueue_fill(int dev_id, uint16_t vchan)
return 0;
}
+static int
+test_burst_capacity(int dev_id, uint16_t vchan)
+{
+#define CAP_TEST_BURST_SIZE 64
+ const int ring_space = rte_dma_burst_capacity(dev_id, vchan);
+ struct rte_mbuf *src, *dst;
+ int i, j, iter;
+ int cap, ret;
+ bool dma_err;
+
+ src = rte_pktmbuf_alloc(pool);
+ dst = rte_pktmbuf_alloc(pool);
+
+ /* to test capacity, we enqueue elements and check capacity is reduced
+ * by one each time - rebaselining the expected value after each burst
+ * as the capacity is only for a burst. We enqueue multiple bursts to
+ * fill up half the ring, before emptying it again. We do this twice to
+ * ensure that we get to test scenarios where we get ring wrap-around
+ */
+ for (iter = 0; iter < 2; iter++) {
+ for (i = 0; i < (ring_space / (2 * CAP_TEST_BURST_SIZE)) + 1; i++) {
+ cap = rte_dma_burst_capacity(dev_id, vchan);
+
+ for (j = 0; j < CAP_TEST_BURST_SIZE; j++) {
+ ret = rte_dma_copy(dev_id, vchan, rte_pktmbuf_iova(src),
+ rte_pktmbuf_iova(dst), COPY_LEN, 0);
+ if (ret < 0)
+ ERR_RETURN("Error with rte_dmadev_copy\n");
+
+ if (rte_dma_burst_capacity(dev_id, vchan) != cap - (j + 1))
+ ERR_RETURN("Error, ring capacity did not change as expected\n");
+ }
+ if (rte_dma_submit(dev_id, vchan) < 0)
+ ERR_RETURN("Error, failed to submit burst\n");
+
+ if (cap < rte_dma_burst_capacity(dev_id, vchan))
+ ERR_RETURN("Error, avail ring capacity has gone up, not down\n");
+ }
+ await_hw(dev_id, vchan);
+
+ for (i = 0; i < (ring_space / (2 * CAP_TEST_BURST_SIZE)) + 1; i++) {
+ ret = rte_dma_completed(dev_id, vchan,
+ CAP_TEST_BURST_SIZE, NULL, &dma_err);
+ if (ret != CAP_TEST_BURST_SIZE || dma_err) {
+ enum rte_dma_status_code status;
+
+ rte_dma_completed_status(dev_id, vchan, 1, NULL, &status);
+ ERR_RETURN("Error with rte_dmadev_completed, %u [expected: %u], dma_err = %d, i = %u, iter = %u, status = %u\n",
+ ret, CAP_TEST_BURST_SIZE, dma_err, i, iter, status);
+ }
+ }
+ cap = rte_dma_burst_capacity(dev_id, vchan);
+ if (cap != ring_space)
+ ERR_RETURN("Error, ring capacity has not reset to original value, got %u, expected %u\n",
+ cap, ring_space);
+ }
+
+ rte_pktmbuf_free(src);
+ rte_pktmbuf_free(dst);
+
+ return 0;
+}
+
static int
test_dmadev_instance(uint16_t dev_id)
{
@@ -728,6 +791,10 @@ test_dmadev_instance(uint16_t dev_id)
if (runtest("copy", test_enqueue_copies, 640, dev_id, vchan, CHECK_ERRS) < 0)
goto err;
+ /* run some burst capacity tests */
+ if (runtest("burst capacity", test_burst_capacity, 1, dev_id, vchan, CHECK_ERRS) < 0)
+ goto err;
+
/* to test error handling we can provide null pointers for source or dest in copies. This
* requires VA mode in DPDK, since NULL(0) is a valid physical address.
* We also need hardware that can report errors back.