linux-kernel - Re: [RFC v2 1/4] bridge: enable interfaces to opt out from becoming the root bridge

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Message-ID: <20140216105754.63738163@nehalam.linuxnetplumber.net>
Date:	Sun, 16 Feb 2014 10:57:54 -0800
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	netdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	bridge@...ts.linux-foundation.org
Subject: Re: [RFC v2 1/4] bridge: enable interfaces to opt out from becoming
 the root bridge

On Fri, 14 Feb 2014 18:59:37 -0800
"Luis R. Rodriguez" <mcgrof@...not-panic.com> wrote:

> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> It doesn't make sense for some interfaces to become a root bridge
> at any point in time. One example is virtual backend interfaces
> which rely on other entities on the bridge for actual physical
> connectivity. They only provide virtual access.
> 
> Device drivers that know they should never become part of the
> root bridge have been using a trick of setting their MAC address
> to a high broadcast MAC address such as FE:FF:FF:FF:FF:FF. Instead
> of using these hacks lets the interfaces annotate its intent and
> generalizes a solution for multiple drivers, while letting the
> drivers use a random MAC address or one prefixed with a proper OUI.
> This sort of hack is used by both qemu and xen for their backend
> interfaces.
> 
> Cc: Stephen Hemminger <stephen@...workplumber.org>
> Cc: bridge@...ts.linux-foundation.org
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>

This is already supported in a more standard way via the root
block flag.

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