netdev - Re: [PATCH] xen: netfront: handle incoming GSO SKBs which are not CHECKSUM

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Date:	Thu, 27 Jan 2011 14:23:48 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ian.campbell@...rix.com
Cc:	netdev@...r.kernel.org, jeremy@...p.org,
	xen-devel@...ts.xensource.com
Subject: Re: [PATCH] xen: netfront: handle incoming GSO SKBs which are not
 CHECKSUM_PARTIAL

From: Ian Campbell <ian.campbell@...rix.com>
Date: Thu, 27 Jan 2011 14:14:03 +0000

> The Linux network stack expects all GSO SKBs to have ip_summed ==
> CHECKSUM_PARTIAL (which implies that the frame contains a partial
> checksum) and the Xen network ring protocol similarly expects an SKB
> which has GSO set to also have NETRX_csum_blank (which also implies a
> partial checksum).
> 
> However there have been cases of buggy guests which mark a frame as
> GSO but do not set csum_blank. If we detect that we a receiving such a
> frame (which manifests as ip_summed != PARTIAL && skb_is_gso) then
> force the SKB to partial and recalculate the checksum, since we cannot
> rely on the peer having done so if they have not set csum_blank.
> 
> Add an ethtool stat to track occurances of this event.
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>

Looks great, applied, thanks Ian.
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