netdev - Re: [RFC] Stable interface index option

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Message-Id: <1449004499.3829359.455124521.608D0A9E@webmail.messagingengine.com>
Date:	Tue, 01 Dec 2015 22:14:59 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	David Miller <davem@...emloft.net>, stephen@...workplumber.org
Cc:	max@...2324.org, netdev@...r.kernel.org
Subject: Re: [RFC] Stable interface index option

On Tue, Dec 1, 2015, at 21:57, David Miller wrote:
> 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?

I had several snmp installations with net-snmp and munin, cacti and so
on and all had the interface name in ifDescription already some years
back.
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