+static int
+netdev_dummy_listen(struct netdev *netdev_ OVS_UNUSED)
+{
+ /* It's OK to listen on a dummy device. It just never receives any
+ * packets. */
+ return 0;
+}
+
+static int
+netdev_dummy_recv(struct netdev *netdev_ OVS_UNUSED,
+ void *buffer OVS_UNUSED, size_t size OVS_UNUSED)
+{
+ /* A dummy device never receives any packets. */
+ return -EAGAIN;
+}
+