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From: David Miller <davem@davemloft.net>
To: ian.campbell@citrix.com
Cc: netdev@vger.kernel.org, jeremy@goop.org, xen-devel@lists.xensource.com
Subject: Re: [PATCH] xen: netfront: handle incoming GSO SKBs which are not CHECKSUM_PARTIAL
Date: Thu, 27 Jan 2011 14:23:48 -0800 (PST)	[thread overview]
Message-ID: <20110127.142348.39184559.davem@davemloft.net> (raw)
In-Reply-To: <1296137643-24814-1-git-send-email-ian.campbell@citrix.com>

From: Ian Campbell <ian.campbell@citrix.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@citrix.com>

Looks great, applied, thanks Ian.

      reply	other threads:[~2011-01-27 22:23 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-05 13:23 [PATCH] xen: netfront: Drop GSO SKBs which do not have csum_blank Ian Campbell
2011-01-11 11:46 ` Ian Campbell
2011-01-22  0:58 ` Jeremy Fitzhardinge
2011-01-22  9:43   ` Ian Campbell
2011-01-24 17:55     ` Jeremy Fitzhardinge
2011-01-25 17:09       ` Ian Campbell
2011-01-25 17:09         ` [PATCH 1/2] xen: netfront: refactor code for checking validity of incoming skbs Ian Campbell
2011-01-25 17:09           ` Ian Campbell
2011-01-25 17:10         ` [PATCH 2/2] xen: netfront: Drop GSO SKBs which do not have csum_blank Ian Campbell
2011-01-25 17:10           ` Ian Campbell
2011-01-26  3:44           ` David Miller
2011-01-26 11:56             ` Ian Campbell
2011-01-27 14:14               ` [PATCH] xen: netfront: handle incoming GSO SKBs which are not CHECKSUM_PARTIAL Ian Campbell
2011-01-27 14:14                 ` Ian Campbell
2011-01-27 22:23                 ` David Miller [this message]

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