netdev - Re: Network Device Naming mechanism and policy

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Message-ID: <20090409145818.GA13155@auslistsprd01.us.dell.com>
Date:	Thu, 9 Apr 2009 09:58:19 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-hotplug@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Network Device Naming mechanism and policy

On Tue, Mar 24, 2009 at 03:57:56PM -0700, David Miller wrote:
> From: Matt Domsch <Matt_Domsch@...l.com>
> Date: Tue, 24 Mar 2009 10:46:17 -0500
> 
> > Problem: Users expect on-motherboard NICs to be named eth0..ethN.
> > This can be difficult to achieve.
> 
> I learned a long time ago that eth0 et al. have zero meaning.
> 
> If the system firmware folks gave us topology information with respect
> to these things, we could export something that tools such as
> NetworkManager, iproute2, etc. could use.
> 
> For example, if we were told that PCI device "domain:bus:dev:fn" has
> string label "Onboard Ethernet 0" then we could present that to the
> user.
> 
> Changing how the actual network device name is determined is going to
> have zero traction.

David, would you be opposed to the additional device names being done
as device nodes in userspace, as several people suggested?

/sys/devices/*/net/ifindex already exports the netlink device index.
It would be trivial to add a /sys/devices/*/net/dev file, with
<major>:<minor> for a device, where <minor> = ifindex.

Then udev could then maintain /dev/net/by-{mac,path,...} as symlinks
to /dev/net/$kernelname.

Tools such as iproute's 'ip' could then be extended to look up their
'dev' argument by /dev path, resolve the symlink to name, get the device node, and
open the socket with the minor number / index (as normal).

Thanks,
Matt

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
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