netdev - Re: [PATCH] rtnl: provide link dump consistency info

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Message-Id: <20110701.154029.1235465964568585857.davem@davemloft.net>
Date:	Fri, 01 Jul 2011 15:40:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...radead.org
Cc:	johannes@...solutions.net, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org, samuel@...tiz.org,
	aloisio.almeida@...nbossa.org, linville@...driver.com,
	tgraf@...g.ch
Subject: Re: [PATCH] rtnl: provide link dump consistency info

From: Thomas Graf <tgraf@...radead.org>
Date: Tue, 21 Jun 2011 09:11:20 -0400

> This patch adds a change sequence counter to each net namespace
> which is bumped whenever a netdevice is added or removed from
> the list. If such a change occurred while a link dump took place,
> the dump will have the NLM_F_DUMP_INTR flag set in the first
> message which has been interrupted and in all subsequent messages
> of the same dump.
> 
> Note that links may still be modified or renamed while a dump is
> taking place but we can guarantee for userspace to receive a
> complete list of links and not miss any.
> 
> Testing:
> I have added 500 VLAN netdevices to make sure the dump is split
> over multiple messages. Then while continuously dumping links in
> one process I also continuously deleted and re-added a dummy
> netdevice in another process. Multiple dumps per seconds have
> had the NLM_F_DUMP_INTR flag set.
> 
> I guess we can wait for Johannes patch to hit net-next via the
> wireless tree.  I just wanted to give this some testing right away.
> 
> Signed-off-by: Thomas Graf <tgraf@...radead.org>

Applied.
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