// SPDX-License-Identifier: GPL-2.0-only

  /*

   * Copyright (c) 2007-2012 Nicira, Inc.

   */
  
  #include <linux/netdevice.h>
  #include <net/genetlink.h>

  #include <net/netns/generic.h>

  
  #include "datapath.h"
  #include "vport-internal_dev.h"
  #include "vport-netdev.h"

  static void dp_detach_port_notify(struct vport *vport)
  {
  	struct sk_buff *notify;
  	struct datapath *dp;
  
  	dp = vport->dp;

  	notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
  					  0, 0, OVS_VPORT_CMD_DEL);

  	ovs_dp_detach_port(vport);
  	if (IS_ERR(notify)) {

  		genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,

  			     0, PTR_ERR(notify));

  		return;
  	}

  	genlmsg_multicast_netns(&dp_vport_genl_family,
  				ovs_dp_get_net(dp), notify, 0,

  				0, GFP_KERNEL);

  }
  
  void ovs_dp_notify_wq(struct work_struct *work)
  {
  	struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
  	struct datapath *dp;
  
  	ovs_lock();
  	list_for_each_entry(dp, &ovs_net->dps, list_node) {
  		int i;
  
  		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
  			struct vport *vport;
  			struct hlist_node *n;
  
  			hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {

  				if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)

  					continue;

  				if (!(netif_is_ovs_port(vport->dev)))

  					dp_detach_port_notify(vport);
  			}
  		}
  	}
  	ovs_unlock();
  }

  static int dp_device_event(struct notifier_block *unused, unsigned long event,
  			   void *ptr)
  {

  	struct ovs_net *ovs_net;

  	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

  	struct vport *vport = NULL;

  	if (!ovs_is_internal_dev(dev))

  		vport = ovs_netdev_get_vport(dev);
  
  	if (!vport)
  		return NOTIFY_DONE;

  	if (event == NETDEV_UNREGISTER) {

  		/* upper_dev_unlink and decrement promisc immediately */
  		ovs_netdev_detach_dev(vport);
  
  		/* schedule vport destroy, dev_put and genl notification */

  		ovs_net = net_generic(dev_net(dev), ovs_net_id);
  		queue_work(system_wq, &ovs_net->dp_notify_work);

  	}
  
  	return NOTIFY_DONE;
  }
  
  struct notifier_block ovs_dp_device_notifier = {
  	.notifier_call = dp_device_event
  };