netdev - Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

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Date:	Sun, 24 Jan 2010 14:36:23 +1300
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	anders@...insight.net, Jie.Yang@...eros.com,
	netdev@...r.kernel.org, 565404@...s.debian.org,
	Xiong.Huang@...eros.com
Subject: Re: Bug#565404: linux-image-2.6.26-2-amd64: atl1e: TSO is broken

Ben Hutchings <ben@...adent.org.uk> wrote:
> 
> Based on the TCP sequence numbers, it seems that the length of the
> broken packet is correct but its IP header is wrong.
> 
> My understanding is that the length of the TCP payload in a GSO skb must
> always be a multiple of the gso_size, so that hardware is not required
> to adjust length fields.  So I see several possible explanations:

No, there is no such requirement.  The trailer skb can be of any
size less than or equal to gso_size.

However, if the hardware assumed this then yes it would explain
the problem.

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