netdev - Re: setting flow spec rules under vswitch configuration

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Date:	Wed, 10 Oct 2012 18:27:25 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Or Gerlitz <ogerlitz@...lanox.com>
CC:	Rony Efraim <ronye@...lanox.com>, netdev <netdev@...r.kernel.org>,
	Amir Vadai <amirv@...lanox.com>
Subject: Re: setting flow spec rules under vswitch configuration

On Wed, 2012-10-10 at 16:31 +0200, Or Gerlitz wrote:
> On 10/10/2012 16:28, Ben Hutchings wrote:
> > On Wed, 2012-10-10 at 16:16 +0200, Or Gerlitz wrote:
> > [...]
> >> >Thanks for setting the sketch of a plan here... so if we go little bit
> >> >into details, we can safely move 20 bytes from the hadata[60] field into
> >> >the beginning of struct ethtool_flow_ext, which will still allow old
> >> >user space to work with newer kernels. As for newer uses space that
> >> >would like to set mac addresses within
> >> >ethtool_flow_ext, how are they supposed to identify if the kernel
> >> >supports this extension (of the extension...)?
> > Well they can't tell in advance, but we can define another flag in
> > flow_type like FLOW_EXT and existing drivers will reject flow specs with
> > that flag set.
> I understand what we can add a flag which will be rejected by driver's 
> that don't support this ext,
> can the same/similar flag be used for newer user space code to mark they 
> want this ext?

Exactly.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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