netdev - Re: [PATCH v2] ravb: minimize TX data copying

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Message-Id: <20150727.012259.913287007411624198.davem@davemloft.net>
Date:	Mon, 27 Jul 2015 01:22:59 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	sergei.shtylyov@...entembedded.com
Cc:	netdev@...r.kernel.org, linux-sh@...r.kernel.org
Subject: Re: [PATCH v2] ravb: minimize TX data copying

From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Date: Sat, 25 Jul 2015 23:42:01 +0300

> Renesas Ethernet AVB controller requires that all data are aligned on 4-byte
> boundary.  While it's  easily achievable for  the RX  data with  the help of
> skb_reserve() (we even align on 128-byte boundary as recommended by the manual),
> we  can't  do the same with the TX data, and it always comes  unaligned from
> the networking core. Originally we solved it an easy way, copying all packet
> to  a  preallocated  aligned buffer; however, it's enough to copy only up to
> 3 first bytes from each packet, doing the transfer using 2 TX descriptors
> instead of just 1. Here's an implementation of the new  TX algorithm that
> significantly reduces the driver's memory requirements.
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>

Applied, thanks.
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