Skip to contentSkip to conversation

ip6mr: Optimize multiple unregistration

PATCH Applied Eric Dumazet 2 participants 2 messages Oct 28, 2009 – Oct 29, 2009

Subsystems (3)
Networking Network drivers IPv4/IPv6
lore
Share & tools
lore

Eric Dumazet

author
#0 lore raw

PATCH 1/1 ip6mr: Optimize multiple unregistration

Speedup module unloading by factorizing synchronize_rcu() calls

Signed-off-by Eric Dumazet <[email protected]>
---
 net/ipv6/ip6mr.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)
net/ipv6/ip6mr.c +10 -5
index 85849b4..52e0f74 100644
@@ -477,7 +477,7 @@ failure:
  *	Delete a VIF entry
  */
 
-static int mif6_delete(struct net *net, int vifi)
+static int mif6_delete(struct net *net, int vifi, struct list_head *head)
 {
 	struct mif_device *v;
 	struct net_device *dev;

@@ -519,7 +519,7 @@ static int mif6_delete(struct net *net, int vifi)
 		in6_dev->cnf.mc_forwarding--;
 
 	if (v->flags & MIFF_REGISTER)
-		unregister_netdevice(dev);
+		unregister_netdevice_queue(dev, head);
 
 	dev_put(dev);
 	return 0;

@@ -976,6 +976,7 @@ static int ip6mr_device_event(struct notifier_block *this,
 	struct net *net = dev_net(dev);
 	struct mif_device *v;
 	int ct;
+	LIST_HEAD(list);
 
 	if (event != NETDEV_UNREGISTER)
 		return NOTIFY_DONE;

@@ -983,8 +984,10 @@ static int ip6mr_device_event(struct notifier_block *this,
 	v = &net->ipv6.vif6_table[0];
 	for (ct = 0; ct < net->ipv6.maxvif; ct++, v++) {
 		if (v->dev == dev)
-			mif6_delete(net, ct);
+			mif6_delete(net, ct, &list);
 	}
+	unregister_netdevice_many(&list);
+
 	return NOTIFY_DONE;
 }
 

@@ -1188,14 +1191,16 @@ static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock)
 static void mroute_clean_tables(struct net *net)
 {
 	int i;
+	LIST_HEAD(list);
 
 	/*
 	 *	Shut down all active vif entries
 	 */
 	for (i = 0; i < net->ipv6.maxvif; i++) {
 		if (!(net->ipv6.vif6_table[i].flags & VIFF_STATIC))
-			mif6_delete(net, i);
+			mif6_delete(net, i, &list);
 	}
+	unregister_netdevice_many(&list);
 
 	/*
 	 *	Wipe the cache

@@ -1325,7 +1330,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 		if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
 			return -EFAULT;
 		rtnl_lock();
-		ret = mif6_delete(net, mifi);
+		ret = mif6_delete(net, mifi, NULL);
 		rtnl_unlock();
 		return ret;