netdev - Re: PATCH: Network Device Naming mechanism and policy

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Date:	Sat, 10 Oct 2009 09:27:03 -0700
From:	Greg KH <greg@...ah.com>
To:	Sujit K M <sjt.kar@...il.com>
Cc:	Matt Domsch <Matt_Domsch@...l.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev@...r.kernel.org, linux-hotplug@...r.kernel.org,
	Narendra_K@...l.com, jordan_hargrave@...l.com
Subject: Re: PATCH: Network Device Naming mechanism and policy

On Sat, Oct 10, 2009 at 01:47:39PM +0530, Sujit K M wrote:
> Greg,
> 
> 
> > No, the hardware changes the enumeration order, it places _no_
> > guarantees on what order stuff will be found in. ?So this is not the
> > kernel changing, just to be clear.
> > Again, I have a machine here that likes to reorder PCI devices every 4th
> > or so boot times, and that's fine according to the PCI spec. ?Yeah, it's
> > a crappy BIOS, but the manufacturer rightly pointed out that it is not
> > in violation of anything.
> >
> 
> I think the open call should be implemented then. By the patch very little
> knowledge is being shared on type of network implementation it is trying to
> do.

What would open() accomplish?  What good would the file descriptor be?
What could you use it for?

> Also it is messing with core datastructure and procedures. This seems
> to be simplified by changing implementing the other operations like poll().

I don't understand.

> > That is why all distros name network devices based on the only
> > deterministic thing they have today, the MAC address. ?I still fail to
> > see why you do not like this solution, it is honestly the only way to
> > properly name network devices in a sane manner.
> 
> This is feature that needs to be implemented. As per the rules followed.

This feature is already implemented today, all distros have it.

> > All distros also provide a way to easily rename the network devices, to
> > place a specific name on a specific MAC address, so again, this should
> > all be solved already.
> >
> > No matter how badly your BIOS teams mess up the PCI enumeration order :)
> 
> This is an problem, But I think this can be solved by implementing some of the
> routines in the network device.

I don't, see the rules that your distro ships today for persistant
network devices, it's already there, no need to change the kernel at
all.

thanks,

greg k-h
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