netdev - Re: [PATCH 3/3] virtio_net: Fix skb->csum

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Message-ID: <20080529064805.GA18007@gondor.apana.org.au>
Date:	Thu, 29 May 2008 16:48:05 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Mark McLoughlin <markmc@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 3/3] virtio_net: Fix skb->csum_start computation

On Tue, May 27, 2008 at 12:20:47PM +0100, Mark McLoughlin wrote:
> hdr->csum_start is the offset from the start of the ethernet
> header to the transport layer checksum field. skb->csum_start
> is the offset from skb->head.
> 
> skb_partial_csum_set() assumes that skb->data points to the
> ethernet header - i.e. it computes skb->csum_start by adding
> the headroom to hdr->csum_start.
> 
> Since eth_type_trans() skb_pull()s the ethernet header,
> skb_partial_csum_set() should be called before
> eth_type_trans().
> 
> Signed-off-by: Mark McLoughlin <markmc@...hat.com>

Good catch! Clearly shows I never ran this across a real Ethernet
device :)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
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