Patch "ipv6: update ip6_rt_last_gc every time GC is run" has been added to the 3.10-stable tree

Patch "ipv6: update ip6_rt_last_gc every time GC is run" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ipv6: update ip6_rt_last_gc every time GC is run

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ipv6-update-ip6_rt_last_gc-every-time-gc-is-run.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 49a18d86f66d33a20144ecb5a34bba0d1856b260 Mon Sep 17 00:00:00 2001
From: Michal Kubeček <mkubecek@suse.cz>
Date: Thu, 1 Aug 2013 10:04:24 +0200
Subject: ipv6: update ip6_rt_last_gc every time GC is run

From: Michal Kubeček <mkubecek@suse.cz>

commit 49a18d86f66d33a20144ecb5a34bba0d1856b260 upstream.

As pointed out by Eric Dumazet, net->ipv6.ip6_rt_last_gc should
hold the last time garbage collector was run so that we should
update it whenever fib6_run_gc() calls fib6_clean_all(), not only
if we got there from ip6_dst_gc().

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/ipv6/ip6_fib.c |    6 +++++-
 net/ipv6/route.c   |    4 +---
 2 files changed, 6 insertions(+), 4 deletions(-)

--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1650,6 +1650,8 @@ static DEFINE_SPINLOCK(fib6_gc_lock);
 
 void fib6_run_gc(unsigned long expires, struct net *net, bool force)
 {
+	unsigned long now;
+
 	if (force) {
 		spin_lock_bh(&fib6_gc_lock);
 	} else if (!spin_trylock_bh(&fib6_gc_lock)) {
@@ -1662,10 +1664,12 @@ void fib6_run_gc(unsigned long expires,
 	gc_args.more = icmp6_dst_gc();
 
 	fib6_clean_all(net, fib6_age, 0, NULL);
+	now = jiffies;
+	net->ipv6.ip6_rt_last_gc = now;
 
 	if (gc_args.more)
 		mod_timer(&net->ipv6.ip6_fib_timer,
-			  round_jiffies(jiffies
+			  round_jiffies(now
 					+ net->ipv6.sysctl.ip6_rt_gc_interval));
 	else
 		del_timer(&net->ipv6.ip6_fib_timer);
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1334,7 +1334,6 @@ static void icmp6_clean_all(int (*func)(
 
 static int ip6_dst_gc(struct dst_ops *ops)
 {
-	unsigned long now = jiffies;
 	struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
 	int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
 	int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
@@ -1344,13 +1343,12 @@ static int ip6_dst_gc(struct dst_ops *op
 	int entries;
 
 	entries = dst_entries_get_fast(ops);
-	if (time_after(rt_last_gc + rt_min_interval, now) &&
+	if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
 	    entries <= rt_max_size)
 		goto out;
 
 	net->ipv6.ip6_rt_gc_expire++;
 	fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
-	net->ipv6.ip6_rt_last_gc = now;
 	entries = dst_entries_get_slow(ops);
 	if (entries < ops->gc_thresh)
 		net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;


Patches currently in stable-queue which might be from mkubecek@suse.cz are

queue-3.10/ipv6-prevent-fib6_run_gc-contention.patch
queue-3.10/ipv6-update-ip6_rt_last_gc-every-time-gc-is-run.patch