netdev - Re: [PATCH net-next 1/3] tuntap: allow changing ethtool speed (v2)

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Message-ID: <20130724171750.112cf0df@nehalam.linuxnetplumber.net>
Date:	Wed, 24 Jul 2013 17:17:50 -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 1/3] tuntap: allow changing ethtool speed (v2)

On Thu, 25 Jul 2013 00:40:50 +0100
Ben Hutchings <bhutchings@...arflare.com> wrote:

> On Wed, 2013-07-24 at 16:11 -0700, Stephen Hemminger wrote:
> > The data reported by the ethtool interface for tun/tap devices is
> > artificial. The default speed is 10Mbit. Virtual interfaces are often
> > faster than this nowadays, so the observed bandwidth may exceed the
> > available bandwidth. This patch allows an administrator to change the
> > available bandwidth as reported by ethtool.
> > 
> > Signed-off-by: Helmut Grohne <h.grohne@...nusnetworks.de>
> > Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> > 
> > ---
> > v2 - allow setting duplex as well, fix patch formatting
> 
> It's logically full duplex so this doesn't make sense to me.
> 
> >      ignore other settings in set
> [...]
> 
> No, please never do that in ethtool_ops::set_settings.  Setting
> unsupported values is an error.

Almost every hardware driver out there allows mucking with settings
that it doesn't care about (like transceiver and port). Why be picky now?
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