netdev - Re: skb header allocation

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Message-ID: <20090903162344.108374cb@nehalam>
Date:	Thu, 3 Sep 2009 16:23:44 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
Cc:	Chris Ross <chris@...pilednetworks.com>, netdev@...r.kernel.org
Subject: Re: skb header allocation

On Wed, 26 Aug 2009 08:01:23 +0200
Frank Blaschka <blaschka@...ux.vnet.ibm.com> wrote:

> Is it save to change dev->hard_header_len to a value other than ETH_HLEN for
> an ethernet device?
> 
> I rememeber we run in trouble with some kernel components (netfilter?, I'm
> not sure can't remember the details ...) when we did this is the past.
> 

You can add extra data but need a minimum with ETH_HLEN of space above
packet when receiving.


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