static int do_del_port(struct dp_netdev *, uint16_t port_no);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static int do_del_port(struct dp_netdev *, uint16_t port_no);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);