netdev - Re: Alignment issues with freescale FEC driver

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Message-ID: <20160923181301.GD22965@lunn.ch>
Date:   Fri, 23 Sep 2016 20:13:01 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Eric Nelson <eric@...int.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Fugang Duan <fugang.duan@....com>,
        Otavio Salvador <otavio@...ystems.com.br>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Troy Kisky <troy.kisky@...ndarydevices.com>,
        rmk+kernel@....linux.org.uk, Simone <cjb.sw.nospam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Alignment issues with freescale FEC driver

> Since the hardware requires longword alignment for its' DMA transfers,
> aligning the IP header will require a memcpy, right?

The vf610 FEC has an SHIFT16 bit in register ENETx_TACC, which inserts
two padding bits on transmit. ENETx_RACC has the same.

What about your hardware?

     Andrew