X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;ds=sidebyside;f=lib%2Flibrte_vhost%2Fvirtio_net.c;h=b779034dca83b9f50f67763858960acefc605c08;hb=9253c34cfb9dd32faeb8e513f6d8fafd356a2e62;hp=ae6723766943b805e643c6c6add7d433fb6960db;hpb=8fc9eaaac7181bdfc024230a63a89d550c625dd0;p=dpdk.git

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index ae67237669..b779034dca 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -222,8 +222,9 @@ vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
 	struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
 
 	vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
-	rte_smp_wmb();
-	vq->desc_packed[vq->shadow_last_used_idx].flags = used_elem->flags;
+	/* desc flags is the synchronization point for virtio packed vring */
+	__atomic_store_n(&vq->desc_packed[vq->shadow_last_used_idx].flags,
+			 used_elem->flags, __ATOMIC_RELEASE);
 
 	vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
 				   sizeof(struct vring_packed_desc),
@@ -1494,13 +1495,10 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
 	struct async_inflight_info *pkts_info = vq->async_pkts_info;
 	int n_pkts = 0;
 
-	avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
-
 	/*
-	 * The ordering between avail index and
-	 * desc reads needs to be enforced.
+	 * The ordering between avail index and desc reads need to be enforced.
 	 */
-	rte_smp_rmb();
+	avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
 
 	rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);