linux-kernel - Re: [RFC] usbnet: use eth%d name for known ethernet devices

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Message-ID: <Pine.LNX.4.44L0.1103240955450.2006-100000@iolanthe.rowland.org>
Date:	Thu, 24 Mar 2011 09:56:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Arnd Bergmann <arnd@...db.de>
cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Steve Calfee <stevecalfee@...il.com>,
	Michal Nazarewicz <mnazarewicz@...il.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	<broonie@...nsource.wolfsonmicro.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Greg KH <greg@...ah.com>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	<grant.likely@...retlab.ca>,
	Linux USB list <linux-usb@...r.kernel.org>,
	<andy.green@...aro.org>, <netdev@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	<roger.quadros@...ia.com>,
	Jaswinder Singh <jaswinder.singh@...aro.org>,
	<patches@...aro.org>
Subject: Re: [RFC] usbnet: use eth%d name for known ethernet devices

On Thu, 24 Mar 2011, Arnd Bergmann wrote:

> The documentation for the USB ethernet devices suggests that
> only some devices are supposed to use usb0 as the network interface
> name instead of eth0. The logic used there, and documented in
> Kconfig for CDC is that eth0 will be used when the mac address
> is a globally assigned one, but usb0 is used for the locally
> managed range that is typically used on point-to-point links.
> 
> Unfortunately, this has caused a lot of pain on the smsc95xx
> device that is used on the popular pandaboard without an
> EEPROM to store the MAC address, which causes the driver to
> call random_ether_address().
> 
> Obviously, there should be a proper MAC addressed assigned to
> the device, and discussions are ongoing about how to solve
> this, but this patch at least makes sure that the default
> interface naming gets a little saner and matches what the
> user can expect based on the documentation, including for
> new devices.
> 
> The approach taken here is to flag whether a device might be a 
> point-to-point link with the new FLAG_PTP setting in the usbnet
> driver_info. A driver can set both FLAG_PTP and FLAG_ETHER if

You updated the flag name in the patch but not in the description.

> it is not sure (e.g. cdc_ether), or just one of the two.
> The usbnet framework only looks at the MAC address for device
> naming if both flags are set, otherwise it trusts the flag.

Alan Stern

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