netdev - Re: [PATCH v3] usbnet: use eth%d name for known ethernet devices

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Date:	Fri, 01 Apr 2011 20:12:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	linux-usb@...r.kernel.org, netdev@...r.kernel.org,
	dbrownell@...rs.sourceforge.net, patches@...aro.org,
	greg@...ah.com, nicolas.pitre@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] usbnet: use eth%d name for known ethernet devices

From: Arnd Bergmann <arnd@...db.de>
Date: Fri, 1 Apr 2011 17:06:36 +0200

> 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_POINTTOPOINT setting in
> the usbnet driver_info. A driver can set both FLAG_POINTTOPOINT
> and FLAG_ETHER if 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.
> 
> Signed-off-by: Arnd Bergmann <arnd.bergmann@...aro.org>
> Tested-by: Andy Green <andy.green@...aro.org>

Applied, thanks.
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