netdev - Re: [PATCH] udev: create empty regular files to represent net interfaces

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Date:	Fri, 30 Oct 2009 10:08:45 -0600
From:	dann frazier <dannf@...nf.org>
To:	Narendra_K@...l.com
Cc:	greg@...ah.com, Matt_Domsch@...l.com, kay.sievers@...y.org,
	linux-hotplug@...r.kernel.org, netdev@...r.kernel.org,
	Jordan_Hargrave@...l.com, Charles_Rose@...l.com,
	bhutchings@...arflare.com
Subject: Re: [PATCH] udev: create empty regular files to represent net
	interfaces

On Fri, Oct 30, 2009 at 08:43:44PM +0530, Narendra_K@...l.com wrote:
>  
> >> This way the kernel has only one name, and so does userspace, and 
> >> everyone is happy.
> >
> >There are two issues, which really seem distinct to me.
> >
> >Users expect eth0 to map to first-onboard-nic. That's an 
> >installer issue (since the BIOS can already export this info) 
> >and I agree that if we want to "fix" that, we should fix it there.
> >
> 
> I agree that installers have to be fixed in the sense that they can be
> told to find the right interface. But, they expect determinism and
> depend on "eth0 to map to first-onboard-nic". Installer is one of the
> applications that is affected by this and needs user intervention, if it
> is not told about the right interface. I discussed installer as it is so
> much part of a user experience.

Right, but couldn't the installer do the work of scanning the SMBIOS
to figure out which nics are onboard, and reorder the 'eth*' names
such that these are first? This state could then be written out as
udev rules so that they persist across reboots.

> But the real issue is "eth0 does not map to first-onboard-nic" always
> and applications expecting this would break in data center environments.
> Both the solutions proposed provide a way to overcome it without
> introducing state.
> 
> With regards,
> Narendra K
> 

-- 
dann frazier

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