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Message-ID: <873ac3wboh.fsf@macbook.be.48ers.dk>
Date: Mon, 20 Apr 2009 18:07:58 +0200
From: Peter Korsgaard <jacmet@...site.dk>
To: Marcin Juszkiewicz <marcin@...zkiewicz.com.pl>
Cc: netdev@...r.kernel.org
Subject: Re: dm9601 as ethX or usbX?
>>>>> "Marcin" == Marcin Juszkiewicz <marcin@...zkiewicz.com.pl> writes:
Hi,
Marcin> Is this normal behaviour of those adapters that ones with empty eeprom
Marcin> ends as usbX?
Yes. The code in question is located in
drivers/net/usb/usbnet.c:usbnet_probe():
strcpy (net->name, "usb%d");
...
// heuristic: "usb%d" for links we know are two-host,
// else "eth%d" when there's reasonable doubt. userspace
// can rename the link if it knows better.
if ((dev->driver_info->flags & FLAG_ETHER) != 0
&& (net->dev_addr [0] & 0x02) == 0)
strcpy (net->name, "eth%d");
Bit 1 of the most significant byte of the MAC address specifies that
it's a locally generated (E.G. random) MAC address, which is what
dm9601.c will use if there's nothing specified in the EEPROM (or there
isn't any EEPROM connected).
Marcin> I would prefer to have both as ethX as I use them in devices
Marcin> where usbX as usually usb-gadget (g_ether) and as such usb0
Marcin> is configured in total different scheme.
Marcin> I know that one of options would be using udev and renaming
Marcin> of interface but then I would have to remember to always copy
Marcin> that rule to each device.
Sorry, other than that I don't know any other options (you could
ofcourse try to convince the usbnet maintainer to change the usbnet
logic, but it seems pretty sensible to me).
--
Bye, Peter Korsgaard
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