netdev - Re: LRO/GSO interaction when packets are forwarded

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Message-ID: <20080423061538.GB3946@ff.dom.local>
Date:	Wed, 23 Apr 2008 06:15:38 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Kieran Mansley <kmansley@...arflare.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org
Subject: Re: LRO/GSO interaction when packets are forwarded

On Wed, Apr 23, 2008 at 06:00:18AM +0000, Jarek Poplawski wrote:
> On 23-04-2008 01:01, Stephen Hemminger wrote:
> ...
> >>>> First off, no hardware should ever do LRO on non-local packets. If the
> >>>> hardware isn't smart enough to do this, I guess the bridge code to have
> >>>> an API to turn it off. IP should also turn it off if ip_forwarding
> >>>> is enabled on that device.
> 
> Could you explain this more? (I can't see any obvious reason why
> forwarding between local networks should differ here from bridging?)

...and the second question: is only ip_forwarding flag checking right
way to disable something destined for local packets?
 
Jarek P.
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