netdev - Re: [RFC] Stable interface index option

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Message-Id: <20151201.142749.1921315575696738796.davem@davemloft.net>
Date:	Tue, 01 Dec 2015 14:27:49 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	max@...2324.org, netdev@...r.kernel.org
Subject: Re: [RFC] Stable interface index option

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Tue, 01 Dec 2015 17:02:23 +0100

> 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?

Because all the remote SNMP tools work with interface indexes, not names.
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