netdev - Re: [PATCH] ethtool: ETHTOOL_SFEATURES: remove NETIF_F

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Message-ID: <1305557597.2885.5.camel@bwh-desktop>
Date:	Mon, 16 May 2011 15:53:17 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>
Subject: Re: [PATCH] ethtool: ETHTOOL_SFEATURES: remove NETIF_F_COMPAT
 return

On Mon, 2011-05-16 at 16:23 +0200, Michał Mirosław wrote:
> On Mon, May 16, 2011 at 02:37:46PM +0100, Ben Hutchings wrote:
> > On Mon, 2011-05-16 at 15:28 +0200, Michał Mirosław wrote:
> > > Remove NETIF_F_COMPAT since it's redundant and will be unused after
> > > all drivers are converted to fix/set_features.
> > > 
> > > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > > ---
> > > 
> > > For net as we don't want to have ETHTOOL_F_COMPAT hit stable release.
> > [...]
> > ETHTOOL_F_WISH means that the requested features could not all be
> > enabled, *but are remembered*.  ETHTOOL_F_COMPAT means they were not
> > remembered.
> 
> Hmm. So, lets just revert 39fc0ce5710c53bad14aaba1a789eec810c556f9
> (net: Implement SFEATURES compatibility for not updated drivers).

That's also problematic because it means we can't make any use of the
'available' masks from ETHTOOL_GFEATURES.

The patch I sent is actually tested with a modified ethtool.  The
fallback works.  I don't think you've tested whether any of your
proposals can actually practically be used by ethtool.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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