netdev - Re: [PATCH net] ravb: do not use zero-length alighment DMA request

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Message-ID: <20170113131426.GA12172@verge.net.au>
Date:   Fri, 13 Jan 2017 14:14:26 +0100
From:   Simon Horman <horms@...ge.net.au>
To:     David Miller <davem@...emloft.net>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:     Magnus Damm <magnus.damm@...il.com>, netdev@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Masaru Nagai <masaru.nagai.vx@...esas.com>
Subject: Re: [PATCH net] ravb: do not use zero-length alighment DMA request

On Fri, Jan 13, 2017 at 02:09:00PM +0100, Simon Horman wrote:
> From: Masaru Nagai <masaru.nagai.vx@...esas.com>
> 
> Due to alignment requirements of the hardware transmissions are split into
> two DMA descriptors, a small padding descriptor of 0 - 3 bytes in length
> followed by a descriptor for rest of the packet.
> 
> In the case of IP packets the first descriptor will never be zero due to
> the way that the stack aligns buffers for IP packets. However, for non-IP
> packets it may be zero.

...

Apologies, I forgot to include v2 in the subject prefix.