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Re: [Xen-devel] Bug in Linux dom0 netback?

To: Joakim Dahlstedt <jda@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Bug in Linux dom0 netback?
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 05 Feb 2008 10:33:07 +0000
Cc: Jan Beulich <jbeulich@xxxxxxxxxx>
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On 5/2/08 10:20, "Joakim Dahlstedt" <jda@xxxxxxx> wrote:

> /*
> * We don't support rx-flip path (except old guests who don't
> * grok this feature flag).
> */
> I am a little bit confused by that comment - I think it means we would
> prefer not to use rx-flip but we have to anyhow for guests that don't
> understand the rx-flip-feature. Is that correct? Or does it mean
> something else?

You are exactly correct.

> Is there some sort of plan to long-term completely remove rx-flip from
> netback then?

No, but there are moves to create a new netchannel2 protocol which will be
more extensible, better documented and better able to support new hardware
features like multiple receive queues. Of course it will allow us also to
drop support for rx flip. The likelihood, however, is that we will continue
to support it as a new plug-in datapath in the existing netfront/netback
drivers, and negotiation will be required to use it. So we will basically
continue to support rx-flip as a fallback option for the foreseeable future.

 -- Keir

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