virtio: Add gso support for native virtio driver

Change-Id: I7b735f5a540e8c278bac88245acb3f8c041c49c0
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
diff --git a/src/vnet/devices/virtio/virtio_api.c b/src/vnet/devices/virtio/virtio_api.c
index 82ff791..d73e6f8 100644
--- a/src/vnet/devices/virtio/virtio_api.c
+++ b/src/vnet/devices/virtio/virtio_api.c
@@ -66,6 +66,10 @@
       ap->mac_addr_set = 1;
     }
   ap->sw_if_index = (u32) ~ 0;
+  if (mp->gso_enabled)
+    ap->gso_enabled = 1;
+  else
+    ap->gso_enabled = 0;
   ap->features = clib_net_to_host_u64 (mp->features);
 
   virtio_pci_create_if (vm, ap);