netdev - Re: [PATCH net-next 2/3] tuntap: allow overriding ethtool driver info

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Message-ID: <20130724171617.53a48d24@nehalam.linuxnetplumber.net>
Date:	Wed, 24 Jul 2013 17:16:17 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Helmut Grohne <h.grohne@...nusnetworks.de>,
	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/3] tuntap: allow overriding ethtool driver
 info

On Thu, 25 Jul 2013 00:48:07 +0100
Ben Hutchings <bhutchings@...arflare.com> wrote:

> On Wed, 2013-07-24 at 16:13 -0700, Stephen Hemminger wrote:
> > This patch adds new ioctl to allow setting the ethtool information
> > returned by the TUN device. This is useful when using tun device as a surrogate
> > for hardware or other software emulation.
> 
> I don't like this idea.  Which tools are you trying to fool?  How does
> this work when you don't implement any driver-specific behaviour (e.g.
> SIOCDEVPRIVATE) they expect?

We use surrogate interfaces in user mode application and want to
display different information for these than the normal TUN device.
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