netdev - Re: [PATCH 3.4] xen-netback: allow changing the MAC address of the interface

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Date:	Fri, 6 Jun 2014 15:04:17 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	David Miller <davem@...emloft.net>, stable@...r.kernel.org,
	msw@...zon.com, netdev@...r.kernel.org, xen-devel@...ts.xen.org,
	konrad.wilk@...cle.com
Subject: Re: [PATCH 3.4] xen-netback: allow changing the MAC address of the
 interface

On Thu, Jun 05, 2014 at 04:14:58PM -0700, Greg KH wrote:
> On Thu, Jun 05, 2014 at 02:58:44PM -0700, David Miller wrote:
> > From: Daniel Kiper <daniel.kiper@...cle.com>
> > Date: Mon,  2 Jun 2014 21:46:20 +0200
> >
> > > From: Matt Wilson <msw@...zon.com>
> > >
> > > Sometimes it is useful to be able to change the MAC address of the
> > > interface for netback devices. For example, when using ebtables it may
> > > be useful to be able to distinguish traffic from different interfaces
> > > without depending on the interface name.
> > >
> > > Reported-by: Nikita Borzykh <sample.n@...il.com>
> > > Reported-by: Paul Harvey <stockingpaul@...mail.com>
> > > Cc: netdev@...r.kernel.org
> > > Cc: xen-devel@...ts.xen.org
> > > Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > > Acked-by: Ian Campbell <ian.campbell@...rix.com>
> > > Signed-off-by: Matt Wilson <msw@...zon.com>
> > > Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > > Signed-off-by: David S. Miller <davem@...emloft.net>
> > > (cherry picked from commit 4a633a602c26497b8285a202830829d3be007c7b)
> > >
> > > Signed-off-by: Daniel Kiper <daniel.kiper@...cle.com>
> > > Tested-by: Daniel Kiper <daniel.kiper@...cle.com>
> > > Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> >
> > I don't think this is suitable for -stable.
> >
> > -stable should be restricted bug fixes for things that either
> > are extremely serious, or hit a very huge segment of the user
> > base.
> >
> > This issue does not quality for either condition.
>
> Yeah, it seems like a new feature to me, I'll drop it from my to-apply
> queue.

Yes, in fact it is, however, without it toolstack pollute /var/log/xen/xen-hotplug.log
with "RTNETLINK answers: Operation not supported" error when every domain is started.
Additionally, it is simple two liner and it should not break anything (Konrad and
I did some tests and everything looks OK). I do not mention that from time to time
we add some features like support for new hardware with just new device ID (e.g.
USB devices). So that is why I decided to post this patch to stable.

Daniel
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