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vlan: Optimize multiple unregistration

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Use unregister_netdevice_many() to speedup master device unregister.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-10-27 07:06:49 +00:00 committed by David S. Miller
parent 23289a37e2
commit 63c8099d90
3 changed files with 35 additions and 16 deletions
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1
include/linux/if_vlan.h
View file

@ -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;

49
net/8021q/vlan.c
View file

@ -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--;
synchronize_net();
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;
}

1
net/core/dev.c
View file

@ -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