netdev - Re: [PATCH] net: Add etun driver

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Date:	Tue, 10 Apr 2007 02:06:47 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Johannes Berg <johannes@...solutions.net>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	dim@...nvz.org, netdev@...r.kernel.org, jgarzik@...ox.com,
	containers@...ts.osdl.org, kuznet@....inr.ac.ru,
	shemminger@...ux-foundation.org, greearb@...delatech.com
Subject: Re: [PATCH] net: Add etun driver

Johannes Berg wrote:
> On Mon, 2007-04-09 at 22:11 +0200, Patrick McHardy wrote:
> 
> 
>>Thats why I suggested that we should create one, ideally before adding
>>more sysfs/proc/ioctl/... based interfaces, which we'll have a hard time
>>getting rid of again.
> 
> 
> But then how would we configure initial parameters along with creating
> the interface? That's something that's good to have, and I don't see how
> you can allow it generically.
> 
> Then again, you can of course always add an interface and then change
> its operating parameters etc. but that isn't atomic any more.


Same way as the current RTM_SETLINK message works, but with creating
a new link in advance. It works fine in other subsystems, so I don't
see why it would in this case as well. Some subsystems do it in an
atomic fashion (network schedulers for example), some first create
the object, then configure it (network classifiers in the non-compat
cases). In the network device case I suppose the later should work
fine since a device needs to be set UP in a second action before
it really does anything.

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