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

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Message-ID: <20100629170025.7a130e28@dhcp-lab-109.englab.brq.redhat.com>
Date:	Tue, 29 Jun 2010 17:00:25 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Ben Hutchings <bhutchings@...arflare.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 Tue, 29 Jun 2010 15:41:24 +0100
Ben Hutchings <bhutchings@...arflare.com> wrote:

> On Mon, 2010-06-28 at 15:18 +0100, Ben Hutchings wrote:
> > On Mon, 2010-06-28 at 16:14 +0200, Stanislaw Gruszka wrote:
> > [...]
> > > My plan is something like that:
> > > 
> > > static const struct ethtool_ops my_ethtool_ops = {
> > >         .get_flags              = ethtool_op_get_flags,
> > >         .set_flags              = ethtool_op_set_flags,
> > > 	.supported_flags	= ETH_FLAG_LRO
> > > }
> > > 
> > > Plus op->supported_flags check in ethtool_op_set_flags. That will allow
> > > to define flags per driver. There is also possible to add supported_flags
> > > to netdev, but I would like to avoid that - in such case drivers can use
> > > custom .set_flags function.
> > 
> > Sounds good to me.
> 
> On second thoughts, this is not going work - supported_flags may need to
> be different for different chips handled by the same driver.  

I thought about driver custom ethtool_ops::set_flags in that case.

> In fact,
> this is already the case in sfc.  So I think you should do what I
> suggested previously - add a supported_flags parameter to
> ethtool_op_set_flags.

What about call from net/core/ethtool.c ? 

Stanislaw
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