netdev - Re: [PATCH net 1/2] vlan: make vlan_dev_real

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Message-ID: <20130803201154.GC12638@redhat.com>
Date:	Sat, 3 Aug 2013 22:11:54 +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 1/2] vlan: make vlan_dev_real_dev work over stacked
 vlans

On Sat, Aug 03, 2013 at 10:07:46PM +0200, Nikolay Aleksandrov wrote:
>From: Nikolay Aleksandrov <Nikolay Aleksandrov nikolay@...hat.com>
>
>Sometimes we might have stacked vlans on top of each other, and we're
>interested in the first non-vlan real device on the path, so transform
>vlan_dev_real_dev to go over the stacked vlans and extract the first
>non-vlan device.
>
>Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>

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

>---
> net/8021q/vlan_core.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
>diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
>index 4a78c4d..6ee48aa 100644
>--- a/net/8021q/vlan_core.c
>+++ b/net/8021q/vlan_core.c
>@@ -91,7 +91,12 @@ EXPORT_SYMBOL(__vlan_find_dev_deep);
>
> struct net_device *vlan_dev_real_dev(const struct net_device *dev)
> {
>-	return vlan_dev_priv(dev)->real_dev;
>+	struct net_device *ret = vlan_dev_priv(dev)->real_dev;
>+
>+	while (is_vlan_dev(ret))
>+		ret = vlan_dev_priv(ret)->real_dev;
>+
>+	return ret;
> }
> EXPORT_SYMBOL(vlan_dev_real_dev);
>
>-- 
>1.8.1.4
>
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