netdev - Re: PATCH: Network Device Naming mechanism and policy

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Date:	Tue, 13 Oct 2009 19:53:04 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Dan Williams <dcbw@...hat.com>
Cc:	Bill Nottingham <notting@...hat.com>,
	Scott James Remnant <scott@...ntu.com>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Narendra K <narendra_k@...l.com>, netdev@...r.kernel.org,
	linux-hotplug@...r.kernel.org, jordan_hargrave@...l.com
Subject: Re: PATCH: Network Device Naming mechanism and policy

On Tue, 2009-10-13 at 11:06 -0700, Dan Williams wrote:
> On Mon, 2009-10-12 at 13:37 -0400, Bill Nottingham wrote:
> > Scott James Remnant (scott@...ntu.com) said: 
> > > On the other hand, they *tend* to be unique for a wide range of systems.
> > > This makes them pretty comparable to LABELs on disks, and we have
> > > a /dev/disk/by-label
> > > 
> > > Remember that udev already supports symlink stacking, and priorities and
> > > such.
> > > 
> > > I don't think there's any danger of supporting a /dev/netdev/by-mac by
> > > default, it'll be a benefit to most and those who don't have unique MACs
> > > will just ignore it.
> > 
> > At the moment, we do not appear to get the proper change uevents from things
> > like 'ip link set dev <foo> address <bar>', so we can't currently maintain
> > these symlinks.
> 
> And if we really want seamless support for MAC spoofing, we want
> ETHTOOL_GPERMADDR for all drivers too, so that if your configuration
> says "rename device XX:XX:XX:XX:XX:XX to YY:YY:YY:YY:YY:YY" we can
> actually figure stuff out after the spoof.

ETHTOOL_GPERMADDR is handled in the ethtool core now.  Are you thinking
of drivers that don't have ethtool ops?  Maybe it's time to add default
operations.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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