linux-kernel - Re: [patch net-next v2] ipv6: log autoconfiguration failures

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Date:	Wed, 11 Dec 2013 15:54:52 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	dvlasenk@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	jpirko@...hat.com
Subject: Re: [patch net-next v2] ipv6: log autoconfiguration failures

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Wed, 11 Dec 2013 20:21:38 +0100

> On Wed, Dec 11, 2013 at 12:45:14PM +0100, Denys Vlasenko wrote:
>> If ipv6 auto-configuration does not work, currently it's hard
>> to track what's going on. This change adds log messages
>> (at debug level) on every code path where ipv6 autoconf fails.
>> 
>> v2: fixed indentation in multi-line log output statements.
> 
> Have you seen lots of those problems? Some of those seem like very
> serious problems and maybe could also deserve a pr_warn or pr_err.
> 
> I hope these are one-time errors, so I don't think counters would
> be helpful.

I still think that statitics would better serve this issue.

For one thing, the event would always be counted, whereas with
pr_debug() someone has to turn on dynamic debugging in order
to see the message.

You can make them part of the per-inet6_dev MIB, and therefore
implicitly letting the admin know what interface the events
occurred on.

I would even prefer an approach involving signalling netlink
events in such circumstances with more detailed information.

Thanks.
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