netdev - Re: [RFC] Stable interface index option

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Message-Id: <20151201.155725.733555238839381632.davem@davemloft.net>
Date:	Tue, 01 Dec 2015 15:57:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	stephen@...workplumber.org
Cc:	hannes@...essinduktion.org, max@...2324.org, netdev@...r.kernel.org
Subject: Re: [RFC] Stable interface index option

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Tue, 1 Dec 2015 12:20:38 -0800

> On Tue, 01 Dec 2015 14:28:47 -0500 (EST)
> David Miller <davem@...emloft.net> wrote:
> 
>> From: Stephen Hemminger <stephen@...workplumber.org>
>> Date: Tue, 1 Dec 2015 08:06:52 -0800
>> 
>> > On Tue, 01 Dec 2015 17:02:23 +0100
>> > Hannes Frederic Sowa <hannes@...essinduktion.org> wrote:
>> > 
>> >> On Tue, Dec 1, 2015, at 16:50, Maximilian Wilhelm wrote:
>> >> > > I'm not sure I understand how this would work- are we going to 
>> >> > > pin down the ifindex for some subset of interfaces?
>> >> > 
>> >> > I'm not sure what your idea is, but I guess we might mean the same
>> >> > thing:
>> >> > 
>> >> > What I have in mind is that the user can supply a list of (ifname ->
>> >> > ifindex) entries via a sysfs/procfs interface and if such a list is
>> >> > present, the kernel will search the list for every ifname which is
>> >> > registered and check if there is an entry. If there is, the ifindex
>> >> > for this entry is used. If there is no entry found for the given
>> >> > ifname, the usual algorithm is used (therefore inherently providing
>> >> > backward compatibility).
>> >> 
>> >> Sorry to ask because I don't like this feature at all. There was a lot
>> >> of work on stable interface names. Why do you need stable ifindexes,
>> >> which were never meant to be stable for a longer amount of time?
>> > 
>> > Also current versions of SNMP provide more useful information about
>> > network interface slot information in ifDescription
>> 
>> Well if they do provide strings, then that is probably a better way
>> forward than messing with the kernel.
> 
> It gives strings based on PCI information but nothing useful
> on tunnels.

But at least in theory, that could be extended to do so right?
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