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Commit 63c8099d authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

vlan: Optimize multiple unregistration 



Use unregister_netdevice_many() to speedup master device unregister.

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 23289a37

include/linux/if_vlan.h

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ struct vlan_group { 
					    * the vlan is attached to.

					    */

	unsigned int		nr_vlans;

	int			killall;

	struct hlist_node	hlist;	/* linked list */

	struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];

	struct rcu_head		rcu;

net/8021q/vlan.c

+33 −16
Original line number Diff line number Diff line
@@ -159,11 +159,12 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head) 
	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)

		ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);



	vlan_group_set_device(grp, vlan_id, NULL);

	grp->nr_vlans--;



	if (!grp->killall) {

		vlan_group_set_device(grp, vlan_id, NULL);

		synchronize_net();



	}

	unregister_netdevice_queue(dev, head);



	/* If the group is now empty, kill off the group. */
@@ -183,6 +184,34 @@ void unregister_vlan_dev(struct net_device *dev, struct list_head *head) 
	dev_put(real_dev);

}



void unregister_vlan_dev_alls(struct vlan_group *grp)

{

	LIST_HEAD(list);

	int i;

	struct net_device *vlandev;

	struct vlan_group save;



	memcpy(&save, grp, sizeof(save));

	memset(&grp->vlan_devices_arrays, 0, sizeof(grp->vlan_devices_arrays));

	grp->killall = 1;



	synchronize_net();



	/* Delete all VLANs for this dev. */

	for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {

		vlandev = vlan_group_get_device(&save, i);

		if (!vlandev)

			continue;



		unregister_vlan_dev(vlandev, &list);

		if (grp->nr_vlans == 0)

			break;

	}

	unregister_netdevice_many(&list);

	for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)

		kfree(save.vlan_devices_arrays[i]);

}



static void vlan_transfer_operstate(const struct net_device *dev,

				    struct net_device *vlandev)

{
@@ -524,19 +553,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event, 
		break;



	case NETDEV_UNREGISTER:

		/* Delete all VLANs for this dev. */

		for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {

			vlandev = vlan_group_get_device(grp, i);

			if (!vlandev)

				continue;



			/* unregistration of last vlan destroys group, abort

			 * afterwards */

			if (grp->nr_vlans == 1)

				i = VLAN_GROUP_ARRAY_LEN;



			unregister_vlan_dev(vlandev, NULL);

		}

		unregister_vlan_dev_alls(grp);

		break;

	}

net/core/dev.c

+1 −0
Original line number Diff line number Diff line
@@ -5303,6 +5303,7 @@ void unregister_netdevice_many(struct list_head *head) 
			net_set_todo(dev);

	}

}

EXPORT_SYMBOL(unregister_netdevice_many);



/**

 *	unregister_netdev - remove device from the kernel