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Date:	Wed, 10 Oct 2012 15:28:26 +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 16:16 +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.

> this might be newbee 
> question, I didn't made many ethtool patches so far.
> 
> Also on a related note, what does the 64bit data field of 
> ethtool_flow_ext used for?

Driver-dependent.  ixgbe uses it for something.

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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