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

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Message-Id: <1277731011.2089.1.camel@achroite.uk.solarflarecom.com>
Date:	Mon, 28 Jun 2010 14:16:51 +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 14:58 +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.

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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