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

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Date:	Tue, 10 Apr 2007 07:47:08 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Patrick McHardy <kaber@...sh.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

On Tue, 2007-04-10 at 02:06 +0200, Patrick McHardy wrote:

> 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.

Our virtual devices are always associated with a piece of hardware, and
we really want them to be associated with that at all times, even when
not UP. Everything else seems like a huge complication if only because
then we can't have whoever will be responsible for the device allocate
it's private space area.

johannes

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