linux-kernel - Re: [PATCH 22/25] xen: xen-netfront: use skb.cb for storing private data

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Date:	Fri, 27 Apr 2007 15:19:50 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	virtualization@...ts.osdl.org, lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Christian Limpach <Christian.Limpach@...cam.ac.uk>
Subject: Re: [PATCH 22/25] xen: xen-netfront: use skb.cb for storing private
 data

Herbert Xu wrote:
> Sure thing.  I'll look over it soon.
>
> Actually there is one thing I'd like to see changed first up: I noticed
> that you've stripped out the checksum hack which is in the main Xen tree.
> We actually have the code in net-2.6.22 (which is also in mm) that lets
> you use CHECKSUM_PARTIAL on received packets without having to do that
> hack.
>
> Here's the patch that I've been testing so far.  It's against the Xen
> source, but should be easy to adapt to your version as well.
>
> I just thought about this again, and in fact we need this change for
> correctness as well as performance.  Because not setting ip_summed
> to CHECKSUM_PARTIAL in netfront is not going to stop netback from
> sending CHECKSUM_PARTIAL packets to us.  If these packets are then
> routed/bridged back to netback, they'll have the wrong checksum.
>   

OK, I've been sitting on this in the hope that I'll suddenly see the
light and work out what you're talking about - but apparently that's not
going to happen.  So, some questions:

   1. Does this patch change the dom0 <-> domU interface?  or does it
      fix something that's currently broken?
   2. Can just apply the netfront part to the pv_ops kernel, or does it
      require the corresponding dom0 patch to be applied as well?

Thanks,
    J
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