netdev - Re: [PATCH v3] vlan: Fix the ingress VLAN_FLAG_REORDER

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Message-ID: <20110610103503.GD17568@minipsycho.redhat.com>
Date:	Fri, 10 Jun 2011 12:35:05 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	David Miller <davem@...emloft.net>, pratnakarlx@...il.com,
	ebiederm@...ssion.com, shemminger@...ux-foundation.org,
	greearb@...delatech.com, nicolas.2p.debian@...il.com,
	netdev@...r.kernel.org, kaber@...sh.net, fubar@...ibm.com,
	eric.dumazet@...il.com, andy@...yhouse.net, jesse@...ira.com
Subject: Re: [PATCH v3] vlan: Fix the ingress VLAN_FLAG_REORDER_HDR check

Fri, Jun 10, 2011 at 11:49:27AM CEST, xiaosuo@...il.com wrote:
>On Fri, Jun 10, 2011 at 5:34 PM, Jiri Pirko <jpirko@...hat.com> wrote:
>> Fri, Jun 10, 2011 at 11:26:06AM CEST, xiaosuo@...il.com wrote:
>>>On Fri, Jun 10, 2011 at 4:35 PM, Jiri Pirko <jpirko@...hat.com> wrote:
>>>> +
>>>> +/* Should be used only to revert vlan_reorder_header action */
>>>> +static struct sk_buff *vlan_unreorder_header(struct sk_buff *skb)
>>>> +{
>>>> +       unsigned char *mac_header;
>>>> +       struct vlan_ethhdr *veth;
>>>> +
>>>> +       if (skb_cow(skb, skb_headroom(skb)) < 0)
>>>> +               return NULL;
>>>
>>>I think we need to make sure if there is enough headroom for this
>>>header expansion.
>>
>> Well the header expansion was previously there so there should be place
>> there in all cases, or am I wrong?
>
>For hw-accel-vlan-rx, is the headroom for this header expansion
>reserved? I don't think so. Thanks.

But this wasn't done for hw-accel-vlan-rx previously right? So why don't
check for hw-accel-vlan-rx and don do unreorder in that case?
>
>-- 
>Regards,
>Changli Gao(xiaosuo@...il.com)
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