vhost: workaround stale vring base

[dpdk.git] / lib / librte_vhost / virtio-net.c

diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index 835ab3a314316767dca7b6c5e40e75002948e13e..bd7e55ed62994d67849d81e3d1a91302c82fd923 100644 (file)
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -561,6 +561,15 @@ vhost_set_vring_addr(int vid, struct vhost_vring_addr *addr)
                return -1;
        }
 
+       if (vq->last_used_idx != vq->used->idx) {
+               RTE_LOG(WARNING, VHOST_CONFIG,
+                       "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
+                       "some packets maybe resent for Tx and dropped for Rx\n",
+                       vq->last_used_idx, vq->used->idx);
+               vq->last_used_idx     = vq->used->idx;
+               vq->last_used_idx_res = vq->used->idx;
+       }
+
        vq->log_guest_addr = addr->log_guest_addr;
 
        LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",