netdev - Re: udev can't name PS3's network devices correctly

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Date:	Mon, 14 Apr 2008 14:52:11 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Marco d'Itri <md@...ux.it>, Harald Hoyer <harald@...hat.com>,
	linux-hotplug@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: udev can't name PS3's network devices correctly

On Mon, 2008-04-14 at 13:19 +0100, David Woodhouse wrote:
> On Mon, 2008-04-14 at 14:03 +0200, Kay Sievers wrote:
> > 
> > >  One thing I don't understand: Don't we already emit a KERNEL== criterion
> > >  in the case where there is already a udev rule 'reserving' the name that
> > >  the kernel used for the current device? Why is that one OK, and why only
> > >  in that case? This patch just makes it consistent.
> > 
> > Yes, we do that in the recent udev versions. We only make sure we keep
> > the enumeration across the same basename, not across different device
> > names.
> 
> Right, but you _only_ do that when you're asked to create a rule for a
> device where the kernel's name matches a pre-existing rule.

We do it for all new rules, regardless of pre-existing rules with that
name. It just does not add KERNEL, if some external tool tried to
overwrite the kernel name, we write a rule for.

Not sure why Fedora rules are mangling INTERFACE_NAME here:
  https://bugzilla.redhat.com/show_bug.cgi?id=440568#c4

> You don't do it consistently --

Right, we will do that, if there are no other issues coming up with the
general approach of adding KERNEL matches.

> and Marco was objecting to a patch which just made it
> happen consistently.

Right, I'm just waiting for Marco to comment on this.

> That patch on its own would be sufficient to fix the PS3 and Libertas
> problems, since the kernel uses a different basename for the logical
> devices we want to disambiguate. (It would also fix the clash between
> wlan0 and wmaster0 on mac80211 interfaces).

Sure, that's why we have it in every default rule.

> We probably also want to do the dev_id thing, but maybe not for PS3 and
> Libertas (since it affects their IPv6 addressing too).

It can just be in all rules, like the ATTR{type} match, right?

Thanks,
Kay

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