lkml.org 
[lkml]   [2007]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: forcedeth ?
On 7/31/07, Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> wrote:
> On 31.07.2007 00:17, Gabriel C wrote:
> > Sasa Ostrouska wrote:
> >
> >> Gabriel, hmm, shouldnt udev be able to autoconfigure that ? But I need
> >> to check that, thx for the tip.
> >
> > Yes udev does this based on the MAC address but AFAIK forcedeth is 'special' for some reason
> > ( which I can really remember now and gets on each boot a new MAC address or alike )
>
> Ah yes, that's a workaround for certain buggy boards to make sure you're
> not left without networking even if the MAC address stored on the board
> is bogus.
>
> Basically, forcedeth checks if the MAC address supplied by your
> mainboard is bogus and autogenerates a random MAC address from a private
> range (prefix 00:00:6c) as workaround. However, it will complain loudly
> if it has to do that.
>
> Quoting from forcedeth.c:
> > if (!is_valid_ether_addr(dev->perm_addr)) {
> > /*
> > * Bad mac address. At least one bios sets the mac address
> > * to 01:23:45:67:89:ab
> > */
> > printk(KERN_ERR "%s: Invalid Mac address detected: %02x:%02x:%02x:%02x:%02x:%02x\n",
> > pci_name(pci_dev),
> > dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
> > dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
> > printk(KERN_ERR "Please complain to your hardware vendor. Switching to a random MAC.\n");
> > dev->dev_addr[0] = 0x00;
> > dev->dev_addr[1] = 0x00;
> > dev->dev_addr[2] = 0x6c;
> > get_random_bytes(&dev->dev_addr[3], 3);
> > }
>
> Sometimes it helps to update the BIOS and/or set the MAC address which
> is printed on the board as MAC address in the BIOS.

In any case, it would be nice if the network core could add something like:
MAC_ORIGIN=device
MAC_ORIGIN=user
MAC_ORIGIN=random
or whatever makes sense here, to the uevent environment. So userspace
can handle according to that, like falling back using the
bus-slot-number to lookup the persistent name, or whatever is
appropriate.

Thanks,
Kay
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-07-31 03:55    [from the cache]
©2003-2011 Jasper Spaans