NETDEV_JOIN
call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
call_netdevice_notifiers(NETDEV_JOIN, slave_dev);
event == NETDEV_RELEASE || event == NETDEV_JOIN ||
case NETDEV_JOIN:
case NETDEV_JOIN:
call_netdevice_notifiers(NETDEV_JOIN, dev);
case NETDEV_JOIN: