From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Wed, 26 Nov 2008 01:20:11 +0000 (-0800)
Subject: netns xfrm: per-netns state GC list
X-Git-Tag: v2.6.29-rc1~581^2~448
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=b8a0ae20b0eecd4b86a113d2abe2fa5a582b30a6;p=linux-2.6-omap-h63xx.git

netns xfrm: per-netns state GC list

km_waitq is going to be made per-netns to disallow spurious wakeups
in __xfrm_lookup().

To not wakeup after every garbage-collected xfrm_state (which potentially
can be from different netns) make state GC list per-netns.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index bd688021395..8ceb7656885 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -20,6 +20,7 @@ struct netns_xfrm {
 	unsigned int		state_hmask;
 	unsigned int		state_num;
 	struct work_struct	state_hash_work;
+	struct hlist_head	state_gc_list;
 };
 
 #endif
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 1b2a72c8429..864a97477ae 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -177,7 +177,6 @@ static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
 
 static struct work_struct xfrm_state_gc_work;
-static HLIST_HEAD(xfrm_state_gc_list);
 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
 
 int __xfrm_state_delete(struct xfrm_state *x);
@@ -394,7 +393,7 @@ static void xfrm_state_gc_task(struct work_struct *data)
 	struct hlist_head gc_list;
 
 	spin_lock_bh(&xfrm_state_gc_lock);
-	hlist_move_list(&xfrm_state_gc_list, &gc_list);
+	hlist_move_list(&init_net.xfrm.state_gc_list, &gc_list);
 	spin_unlock_bh(&xfrm_state_gc_lock);
 
 	hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
@@ -527,7 +526,7 @@ void __xfrm_state_destroy(struct xfrm_state *x)
 	WARN_ON(x->km.state != XFRM_STATE_DEAD);
 
 	spin_lock_bh(&xfrm_state_gc_lock);
-	hlist_add_head(&x->gclist, &xfrm_state_gc_list);
+	hlist_add_head(&x->gclist, &init_net.xfrm.state_gc_list);
 	spin_unlock_bh(&xfrm_state_gc_lock);
 	schedule_work(&xfrm_state_gc_work);
 }
@@ -2088,6 +2087,7 @@ int __net_init xfrm_state_init(struct net *net)
 
 	net->xfrm.state_num = 0;
 	INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
+	INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
 	INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task);
 	return 0;