netdev - iproute2 caching and batch mode

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Date:	Sat, 08 Jan 2011 22:09:39 +0200
From:	<denys@...p.net.lb>
To:	Stephen Hemminger <shemminger@...tta.com>, <netdev@...r.kernel.org>
Subject: iproute2 caching and batch mode

Hi,

noticed some issue a while ago, and because of recent patches decided to
post my thoughts:

This issue can happen if ip or tc running in some kind of "daemon" batch
mode, or processing large batch file on computer where interfaces can
reappear with same name but different index (pppoe NAS for example).

It is easy to reproduce the problem:

centaur iproute2-2.6.37 # ip/ip -force -batch -
tunnel add test0 mode ipip remote 1.1.1.2 local 1.1.1.1
link show dev test0
201: test0: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN 
    link/ipip 1.1.1.1 peer 1.1.1.2
tunnel del test0
Unsupported family:17

Or:

centaur iproute2-2.6.37 # ip/ip -force -batch -
tunnel del test0
tunnel add test0 mode ipip remote 1.1.1.2 local 1.1.1.1
link show dev test0
202: test0: <POINTOPOINT,NOARP> mtu 1480 qdisc noop state DOWN 
    link/ipip 1.1.1.1 peer 1.1.1.2
(another console, delete and create again test0)
link show dev test0
(nothing will appear)

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