netdev - Re: [PATCH] net: add Fast Ethernet driver for PXA168.

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Date:	Tue, 10 Aug 2010 13:40:32 +0200
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Philip Rakity <prakity@...vell.com>
Cc:	Sachin Sanap <ssanap@...vell.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ashish Karkare <akarkare@...vell.com>,
	Prabhanjan Sarnaik <sarnaik@...vell.com>,
	"eric.y.miao@...il.com" <eric.y.miao@...il.com>,
	Mark Brown <markb@...vell.com>
Subject: Re: [PATCH] net: add Fast Ethernet driver for PXA168.

On Fri, Aug 06, 2010 at 08:44:02AM -0700, Philip Rakity wrote:

> You should change
> 
> >>> +		skb = dev_alloc_skb(MAX_PKT_SIZE + ETH_HW_IP_ALIGN);
> 
> >> 
> 
> to allocatie ADDITIONAL prepend space in the header.  If you are doing
> ethernet to 802.11 routing or bridging then the wireless driver will
> not have enough space in front of the header to prepend its headers
> without having to allocate additional space.

This seems like something that, should you want to handle it, should be
handled centrally (e.g. by conditionally increasing NET_SKB_PAD or so)
and not hardcoded into one specific driver only.
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