linux-kernel - Re: renaming kernel devices [was: VIA EPIA EK: strange eth dev numbering]

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Date:	Thu, 2 Aug 2007 15:30:43 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Michael Tokarev <mjt@....msk.ru>
cc:	Herbert Rosmanith <kernel@...dsau.enemy.org>,
	linux-kernel@...r.kernel.org
Subject: Re: renaming kernel devices [was: VIA EPIA EK: strange eth dev
 numbering]


On Aug 2 2007 16:56, Michael Tokarev wrote:
>>> I already can see comments from udev/sysfs maintainers here: "naming
>>> is a policy which does not belong to kernel".  It's a bullshit, because
>>> kernel too has to use SOME way to name things,
>> 
>> (1) The kernel starts with ethX
>> (2) udev renames it to something else
>> (3) kernel uses new name too ("ni0: link down")
>
>And now tell me please how can I connect two messages from dmesg:
>
>eth0: Tigon3 [partno(BCM95721) rev 4201 PHY(5750)] (PCI Express) 10/100/1000Base-T Ethernet 00:14:5e:5d:18:26
>nic10: Link is up at 100 Mbps, full duplex.

Generally, the "link is xyz" message comes directly after loading the module,
so it should be eth0 before udev gets a chance to rename it. Or maybe not -
in which case, well, you're literally fubared, and your distro should put a
"renamed A to B" into syslog.

>What I wanted to say (here with network devices, and with disk names
>and everything else) is -- as long as the device is here (plugged in
>but not yet unplugged), I want it to have the same "primary" name in
>kernel and in userspace, so that everything

Oh I think it already has a "primary name" today --

$ readlink /sys/class/net/eth0/device
../../../../../devices/pci0000:00/0000:00:04.0

there is your primary name, and your secondary name is ethZ. :)


	Jan
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