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Date: Tue, 27 Oct 2009 18:06:49 +0100
From: Eric Dumazet <eric.dumazet@...il.com>
To: "David S. Miller" <davem@...emloft.net>
CC: Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH 4/6] vlan: Optimize multiple unregistration
Use unregister_netdevice_many() to speedup master device unregister.
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
include/linux/if_vlan.h | 1
net/8021q/vlan.c | 49 +++++++++++++++++++++++++-------------
net/core/dev.c | 1
3 files changed, 35 insertions(+), 16 deletions(-)
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 8898cbe..71a4870 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -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;
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 6b5c9dd..511afe7 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -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;
}
diff --git a/net/core/dev.c b/net/core/dev.c
index dedacd8..82a3bb9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -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
--
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