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

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Date:	Fri, 06 Apr 2007 20:06:43 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Ben Greear <greearb@...delatech.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Dmitry Mishin <dim@...nvz.org>,
	Linux Containers <containers@...ts.osdl.org>
Subject: Re: [PATCH] net: Add etun driver

Ben Greear <greearb@...delatech.com> writes:

> Is there any way to tell for certain if an interface is a etun or not?  Maybe
> a file could be found (or not) in sysfs somewhere?

Link for any decent network driver ethtool -i <interface>

> Also, how do you find the peer device from user-space?  This would be very
> useful
> for anyone trying to manage these devices with a user-space program.

Currently "ethtool -S <interface>"
And read the partner_ifindex.

Further whoever generates the pair specifies the initial set of names.

> When you are creating new devices, I think you should check to make
> sure there isn't already a device with that name.

alloc_netdev doesn't let you register two devices with the same name,
and I check the return status of alloc_netdev. 

> In general though, I look forward to this being in the kernel so I can drop
> my redirect device code from my out-of-tree patch.

Thanks.

Eric
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