netdev - Re: [PATCH v3 6/6] net: calxedaxgmac: ip align receive buffers

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Date:	Mon, 05 Nov 2012 08:53:37 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v3 6/6] net: calxedaxgmac: ip align receive buffers

On Mon, 2012-11-05 at 10:22 -0600, Rob Herring wrote:
> From: Rob Herring <rob.herring@...xeda.com>
> 
> On gcc 4.7, we will get alignment traps in the ip stack if we don't align
> the ip headers on receive. The h/w can support this, so use ip aligned
> allocations.
> 
> Cut down the unnecessary padding on the allocation. The buffer can start on
> any byte alignment, but the size including the begining offset must be 8
> byte aligned. So the h/w buffer size must include the NET_IP_ALIGN offset.
> 
> Thanks to Eric Dumazet for the initial patch highlighting the padding issues.
> 
> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>


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