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

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Message-ID: <BANLkTimHi7V3YwbPepLyW7=pTS7hQVxEBQ@mail.gmail.com>
Date:	Fri, 10 Jun 2011 17:49:27 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Jiri Pirko <jpirko@...hat.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

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.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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