+void netdev_vport_tunnel_register(void);
+void netdev_vport_patch_register(void);
+
+bool netdev_vport_is_patch(const struct netdev *);
+bool netdev_vport_is_layer3(const struct netdev *);
+
+char *netdev_vport_patch_peer(const struct netdev *netdev);
+
+void netdev_vport_inc_rx(const struct netdev *,
+ const struct dpif_flow_stats *);
+void netdev_vport_inc_tx(const struct netdev *,
+ const struct dpif_flow_stats *);