netdev - Re: [PATCH] Virtual ethernet device (tunnel)

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Date:	Wed, 02 May 2007 14:59:05 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	hadi@...erus.ca
CC:	Pavel Emelianov <xemul@...ru>, David Miller <davem@...emloft.net>,
	Ben Greear <greearb@...delatech.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Kirill Korotaev <dev@...ru>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>, devel@...nvz.org,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: Re: [PATCH] Virtual ethernet device (tunnel)

jamal wrote:
> On Wed, 2007-02-05 at 14:34 +0200, Patrick McHardy wrote:
> 
> 
>>Thats a lot better than using sysfs, but I think it would be
>>preferrable to use rtnetlink instead of genetlink for network
>>configuration.
> 
> 
> or you can just hold rtnl while using genl.
> I do agree it would be easier to just use rtnetlink ...

The rtnl needs to be held in either case, but using a different
netlink family introduces races in message processing. For example
a simple:

ip link add dev veth0
ip route add 10.0.0.0/8 dev veth0

might fail because we have two different input queues and the routing
message might get processed before the link message.
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