netdev - RE: [net-next] iproute2: Add new command to IP link to enable/disable VF spoof check

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Message-ID: <1317055319.2773.41.camel@bwh-desktop>
Date:	Mon, 26 Sep 2011 17:41:59 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Rose, Gregory V" <gregory.v.rose@...el.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: RE: [net-next] iproute2: Add new command to IP link to
 enable/disable VF spoof check

On Mon, 2011-09-26 at 09:21 -0700, Rose, Gregory V wrote:
> > -----Original Message-----
> > From: Stephen Hemminger [mailto:shemminger@...tta.com]
> > Sent: Sunday, September 25, 2011 10:24 AM
> > To: Kirsher, Jeffrey T
> > Cc: Rose, Gregory V; davem@...emloft.net; netdev@...r.kernel.org;
> > gospo@...hat.com
> > Subject: Re: [net-next] iproute2: Add new command to IP link to
> > enable/disable VF spoof check
> > 
> > On Sun, 25 Sep 2011 01:23:18 -0700
> > Jeff Kirsher <jeffrey.t.kirsher@...el.com> wrote:
> > 
> > > From: Greg Rose <gregory.v.rose@...el.com>
> > >
> > > Add IP link command parsing for VF spoof checking enable/disable
> > >
> > > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> > > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > 
> > See my comments about ABI compatibility. Can't just grow size of
> > structure.
> > Need to have new version of iproute work with older kernels.
> 
> In this case I have no idea how to proceed.  I'll go back and stare at it some more.

Where is this structure used on the wire?  I just don't see it.

If the modified iproute2 crashes on older kernels, that's presumably
because it's not correctly handling the case where IFLA_VF_SPOOFCHK is
missing.  Nothing to do with the size of this structure.

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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