netdev - Re: wireless vs. alignment requirements

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Message-ID: <20071125010814.GD31668@gondor.apana.org.au>
Date:	Sun, 25 Nov 2007 09:08:14 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Johannes Berg <johannes@...solutions.net>, dsd@...too.org,
	davem@...emloft.net, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: wireless vs. alignment requirements

On Sat, Nov 24, 2007 at 12:11:08PM -0800, Stephen Hemminger wrote:
>
> Then what about hardware that can't dma ethernet to non-aligned address.
> Sky2 hardware breaks if DMA is not 8 byte aligned.  IMHO the IP stack should
> handle any alignment, and do the appropriate memove if the CPU requires 
> alignment.

Luckily all sky2 users have been on x86 so far :)

Here's an idea.  Put the data of the packet into the page frags
where alignment is not an issue but copy the header so that it
is aligned.

Would that work?

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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