linux-kernel - Re: [patch 7/9] lguest: the net driver

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Date:	Wed, 09 May 2007 22:13:28 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, ak@...e.de, jeff@...zik.org,
	jmorris@...ei.org, netdev@...r.kernel.org
Subject: Re: [patch 7/9] lguest: the net driver

On Wed, 2007-05-09 at 22:00 +1000, Herbert Xu wrote:
> Hi Rusty:
> 
> On Wed, May 09, 2007 at 09:55:25PM +1000, Rusty Russell wrote:
> > 
> > 	NO_CSUM because it really doesn't need a checksum.  The
> > LGUEST_NET_F_NOCSUM is only set for local inter-guest networking.  If
> > some guest were to route the packets outside the machine, this would be
> > an issue, though ("don't do that").
> 
> While I can see that this is good in keeping things simple, I think
> it's something that you want to be able to support since the user
> may wish to setup a guest as a firewall appliance which would involve
> passing packets from another guest to the outside world.

Indeed, you understand the tradeoff.  The example launcher could have an
option not to set the LGUEST_NET_F_NOCSUM in this case.

That said, one significant purpose of lguest is to serve as an example
of how to do things.  So if you feel really strongly that there's a
Right Way, we could look at the patch...

Thanks,
Rusty.


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