[PATCH 3/3] vdpa: Support VLAN on nic control shadow virtqueue

["Eugenio Pérez" <eperezma@redhat.com>]

Update the virtio-net device model with each guest's update of vlan
through control virtqueue, and accept creating a SVQ with a device
exposing vlan feature bit.

Done in the same commit since a malicious guest could send vlan
commands otherwise.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 net/vhost-vdpa.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index ecbfd08eb9..40f7c60399 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -94,6 +94,7 @@ static const uint64_t vdpa_svq_device_features =
     BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) |
     BIT_ULL(VIRTIO_NET_F_STATUS) |
     BIT_ULL(VIRTIO_NET_F_CTRL_VQ) |
+    BIT_ULL(VIRTIO_NET_F_CTRL_VLAN) |
     BIT_ULL(VIRTIO_NET_F_MQ) |
     BIT_ULL(VIRTIO_F_ANY_LAYOUT) |
     BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |
@@ -538,6 +539,16 @@ static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len)
                           __func__, ctrl.cmd);
         };
         break;
+    case VIRTIO_NET_CTRL_VLAN:
+        switch (ctrl->cmd) {
+        case VIRTIO_NET_CTRL_VLAN_ADD:
+        case VIRTIO_NET_CTRL_VLAN_DEL:
+            return true;
+        default:
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid vlan cmd %u\n",
+                          __func__, ctrl->cmd);
+        };
+        break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid control class %u\n",
                       __func__, ctrl.class);
-- 
2.31.1