int netdev_recv(struct netdev *, struct ofpbuf *);
void netdev_recv_wait(struct netdev *);
int netdev_drain(struct netdev *);
int netdev_send(struct netdev *, const struct ofpbuf *);
void netdev_send_wait(struct netdev *);
int netdev_set_etheraddr(struct netdev *, const uint8_t mac[6]);
int netdev_recv(struct netdev *, struct ofpbuf *);
void netdev_recv_wait(struct netdev *);
int netdev_drain(struct netdev *);
int netdev_send(struct netdev *, const struct ofpbuf *);
void netdev_send_wait(struct netdev *);
int netdev_set_etheraddr(struct netdev *, const uint8_t mac[6]);