netdev - Re: iproute2 caching and batch mode

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Date:	Sat, 08 Jan 2011 22:36:03 +0200
From:	<denys@...p.net.lb>
To:	<denys@...p.net.lb>
Cc:	Stephen Hemminger <shemminger@...tta.com>, <netdev@...r.kernel.org>
Subject: Re: iproute2 caching and batch mode

On Sat, 08 Jan 2011 22:09:39 +0200, <denys@...p.net.lb> wrote:
> 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)
Sorry, just got mail sent before i finish it.

Is it appropriate to implement some kind of "flush" command, to flush
internal cache?
I can try to do that, if this way is ok.
Sure maybe best way to monitor interface updates over netlink, in batch
mode, and update cache accordingly.

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