netdev - Re: [PATCH] Expose netdevice dev

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Date:	Sat, 19 Apr 2008 22:32:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arvidjaar@...l.ru
Cc:	linux-hotplug@...r.kernel.org, dwmw2@...radead.org,
	kay.sievers@...y.org, md@...ux.it, harald@...hat.com,
	netdev@...r.kernel.org, schwidefsky@...ibm.com
Subject: Re: [PATCH] Expose netdevice dev_id through sysfs

From: Andrey Borzenkov <arvidjaar@...l.ru>
Date: Sun, 20 Apr 2008 09:21:03 +0400

> On Sparc system we also have global device tree which provides unique
> and persistent reference to every device. Solaris has no problems with
> having same MAC for all interfaces.

SunOS/Solaris names devices geographically on the I/O bus.  So if you
move the card from one slot to another, it's a different device and
you have to change your configuration, which is pretty bogus.

At least under Linux the identity follows the MAC address, which I
definitely see as a superior behavior.

The only problem is handling the multiple devices with same MAC case.

> What is exactly wrong with using device topology path? This should
> exist on any system, it is unique and it is persistent.

Because if you move the device to a different PCI slot it should
still show up as the same device, using the MAC address as the key.
The Solaris behavior isn't so intelligent.
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