vlan: Optimize multiple unregistration

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>

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 8898cbe..71a4870 100644 (file)
--- 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 (file)
--- 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 4513dfd..09551cc 100644 (file)
--- 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