netdev - Re: [PATCH net v2 2/2] net_sched: make dev_trans_start return vlan's real dev trans

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Date:	Sat, 3 Aug 2013 22:12:38 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, fubar@...ibm.com,
	jhs@...atatu.com
Subject: Re: [PATCH net v2 2/2] net_sched: make dev_trans_start return vlan's
 real dev trans_start

On Sat, Aug 03, 2013 at 10:07:47PM +0200, Nikolay Aleksandrov wrote:
>From: Nikolay Aleksandrov <Nikolay Aleksandrov nikolay@...hat.com>
>
>Vlan devices are LLTX and don't update their own trans_start, so if
>dev_trans_start has to be called with a vlan device then 0 or a stale
>value will be returned. Currently the bonding is the only such user, and
>it's needed for proper arp monitoring when the slaves are vlans.
>Fix this by extracting the vlan's real device trans_start.
>
>Suggested-by: David Miller <davem@...emloft.net>
>Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>

Acked-by: Veaceslav Falico <vfalico@...hat.com>

>---
>v2: drop the while, since vlan_dev_real_dev now does it for us
>
> net/sched/sch_generic.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
>diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
>index 4626cef..eeb8276 100644
>--- a/net/sched/sch_generic.c
>+++ b/net/sched/sch_generic.c
>@@ -25,6 +25,7 @@
> #include <linux/rcupdate.h>
> #include <linux/list.h>
> #include <linux/slab.h>
>+#include <linux/if_vlan.h>
> #include <net/sch_generic.h>
> #include <net/pkt_sched.h>
> #include <net/dst.h>
>@@ -207,15 +208,19 @@ void __qdisc_run(struct Qdisc *q)
>
> unsigned long dev_trans_start(struct net_device *dev)
> {
>-	unsigned long val, res = dev->trans_start;
>+	unsigned long val, res;
> 	unsigned int i;
>
>+	if (is_vlan_dev(dev))
>+		dev = vlan_dev_real_dev(dev);
>+	res = dev->trans_start;
> 	for (i = 0; i < dev->num_tx_queues; i++) {
> 		val = netdev_get_tx_queue(dev, i)->trans_start;
> 		if (val && time_after(val, res))
> 			res = val;
> 	}
> 	dev->trans_start = res;
>+
> 	return res;
> }
> EXPORT_SYMBOL(dev_trans_start);
>-- 
>1.8.1.4
>
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