vhost: destroy unused virtqueues when multiqueue not negotiated

[dpdk.git] / lib / librte_vhost / vhost_user.c

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 5ffd889..e54795a 100644 (file)
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -187,6 +187,25 @@ vhost_user_set_features(struct virtio_net *dev, uint64_t features)
                (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
                (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 
+       if (!(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
+               /*
+                * Remove all but first queue pair if MQ hasn't been
+                * negotiated. This is safe because the device is not
+                * running at this stage.
+                */
+               while (dev->nr_vring > 2) {
+                       struct vhost_virtqueue *vq;
+
+                       vq = dev->virtqueue[--dev->nr_vring];
+                       if (!vq)
+                               continue;
+
+                       dev->virtqueue[dev->nr_vring] = NULL;
+                       cleanup_vq(vq, 1);
+                       free_vq(vq);
+               }
+       }
+
        return 0;
 }