[dpdk-dev] [PATCH v1] vhost: remove fallback in async enqueue API

[Patrick Fu <patrick.fu@intel.com>]

By design, async enqueue API should return directly if async device
is not registered. This patch removes the corrupted implementation of
the enqueue fallback from async mode to sync mode.

Fixes: cd6760da1076 ("vhost: introduce async enqueue for split ring")

Signed-off-by: Patrick Fu <patrick.fu@intel.com>
---
 lib/librte_vhost/virtio_net.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 3a019b744..030795645 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1714,7 +1714,6 @@ virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
 {
 	struct vhost_virtqueue *vq;
 	uint32_t nb_tx = 0;
-	bool drawback = false;
 
 	VHOST_LOG_DATA(DEBUG, "(%d) %s\n", dev->vid, __func__);
 	if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
@@ -1727,13 +1726,8 @@ virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
 
 	rte_spinlock_lock(&vq->access_lock);
 
-	if (unlikely(vq->enabled == 0))
-		goto out_access_unlock;
-
-	if (unlikely(!vq->async_registered)) {
-		drawback = true;
+	if (unlikely(vq->enabled == 0 || !vq->async_registered))
 		goto out_access_unlock;
-	}
 
 	if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
 		vhost_user_iotlb_rd_lock(vq);
@@ -1760,9 +1754,6 @@ virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
 out_access_unlock:
 	rte_spinlock_unlock(&vq->access_lock);
 
-	if (drawback)
-		return rte_vhost_enqueue_burst(dev->vid, queue_id, pkts, count);
-
 	return nb_tx;
 }
 
-- 
2.18.4