Re: [PATCHv2 net] usbnet: modern method to get random MAC

[Oliver Neukum]

On 15.10.24 01:00, Eric Dumazet wrote:
> On Tue, Oct 15, 2024 at 12:24 AM Oliver Neukum <oneukum@xxxxxxxx> wrote:
> > On 14.10.24 21:59, Eric Dumazet wrote:
> >
> > > As diagnosed by John Sperbeck :
> > >
> > > This patch implies all ->bind() method took care of populating net->dev_addr ?
> > >
> > > Otherwise the following existing heuristic is no longer working
> > >
> > > // 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 &&
> > >       ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
> > >        (net->dev_addr [0] & 0x02) == 0))
> > > strscpy(net->name, "eth%d", sizeof(net->name));
> >
> > Hi,
> >
> > you need to have a MAC to be an ethernet device, don't you?
>
> Before or after your patch, there was/is a MAC address, eventually random.
>
> The problem is about the test, which is now done while dev->dev_addr
> is full of zeroes, which is not a valid address,
> as shown by :

Hi,

I am sorry I misunderstood you. Yes, I overlooked the test for whether
the MAC has been altered. I am preparing a patch. Could you give me
John Perbeck's address, so I can include him in "reported-by"?

	Sorry
		Oliver