netdev - Re: [PATCH ethtool 2/3] ethtool: Regularise handling of offload flags

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Date:	Tue, 22 Feb 2011 16:44:33 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH ethtool 2/3] ethtool: Regularise handling of offload
 flags

On Tue, 2011-02-22 at 15:50 +0100, Michał Mirosław wrote:
> On Mon, Feb 21, 2011 at 04:59:08PM +0000, Ben Hutchings wrote:
> > Use the new ETHTOOL_{G,S}FEATURES operations where available, and
> > use the new structure and netif feature flags in any case.
> > 
> > Replace repetitive code for getting/setting offload flags with data-
> > driven loops.
> > 
> > This changes error messages to use the same long names for offload
> > flags as in dump_offload(), and changes various exit codes to 1.
> > 
> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> > ---
> > NEITF_F_* flags are copied into ethtool-util.h for now.  I think in
> > future they should be exposed from <linux/netdevice.h> (hence the
> > #ifndef).
> 
> I tried to avoid making NETIF_F_ flags an ABI. That's why there's new
> ETH_SS_FEATURES ethtool string set. When bits in features get used up
> it might be desirable to reorder them while introducing a new field
> in struct net_device (eg. move non-changeable bits out of features).

The order is unimportant.  And feature flags are already exposed through
sysfs, so they are part of the kernel ABI.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
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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