netdev - Re: [PATCH -next] qlcnic: fail when try to setup unsupported features

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Message-Id: <1277731840.2089.8.camel@achroite.uk.solarflarecom.com>
Date:	Mon, 28 Jun 2010 14:30:40 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Amit Salecha <amit.salecha@...gic.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Amerigo Wang <amwang@...hat.com>,
	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Subject: Re: [PATCH -next] qlcnic: fail when try to setup unsupported
 features

On Mon, 2010-06-28 at 14:16 +0100, Ben Hutchings wrote:
> On Mon, 2010-06-28 at 14:58 +0200, Stanislaw Gruszka wrote:
> > On Mon, 28 Jun 2010 07:36:04 -0500
> > Amit Salecha <amit.salecha@...gic.com> wrote:
> > 
> > > -	ethtool_op_set_flags(netdev, data);
> > > -
> > > -	hw_lro = (data & ETH_FLAG_LRO) ? QLCNIC_LRO_ENABLED : 0;
> > > +	if (data & ETH_FLAG_LRO) {
> > > +		hw_lro = QLCNIC_LRO_ENABLED;
> > > +		netdev->features |= NETIF_F_LRO;
> > > +	} else {
> > > +		hw_lro = 0;
> > > +		netdev->features &= ~NETIF_F_LRO;
> > > +	}
> > > 
> > > Above hunk is unnecessary.
> > 
> > Yes, I did not describe that change in the changelog. I want to
> > remove such usage of ethtool_op_set_flags() for my furher patches, where
> > I plan to add return EOPNOTSUPP to ethtool_op_set_flags().
> 
> You might as well remove ethtool_op_set_flags() in that case, as this is
> equivalent to the behaviour when ethtool_ops::set_flags is NULL.
> 
> It would be more useful to add a supported_flags parameter to
> ethtool_op_set_flags() so it can check the requested flags against the
> driver/hardware capabilities.

I also just noticed that ethtool.h says set_flags() will return -EINVAL
for unsupported values.  The current implementations variously return
-EINVAL or -EOPNOTSUPP.

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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