linux-kernel - [PATCH 3.2 104/107] ipv6: update ip6_rt_last

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Message-ID: <lsq.1444349548.371582959@decadent.org.uk>
Date:	Fri, 09 Oct 2015 01:12:28 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Michal Kubeček" <mkubecek@...e.cz>,
	"David S. Miller" <davem@...emloft.net>,
	"Konstantin Khlebnikov" <khlebnikov@...dex-team.ru>
Subject: [PATCH 3.2 104/107] ipv6: update ip6_rt_last_gc every time GC is run

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Michal Kubeček <mkubecek@...e.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@...e.cz>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
---
 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
@@ -1475,6 +1475,8 @@ 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)) {
@@ -1487,10 +1489,12 @@ 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
@@ -1159,7 +1159,6 @@ 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;
@@ -1169,13 +1168,12 @@ 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;

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