netdev - Re: [PATCH -next] vmxnet3: fail when try to setup unsupported features

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Message-ID: <20100629091519.GA2555@dhcp-lab-161.englab.brq.redhat.com>
Date:	Tue, 29 Jun 2010 11:15:20 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Shreyas Bhatewara <sbhatewara@...are.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Amerigo Wang <amwang@...hat.com>
Subject: Re: [PATCH -next] vmxnet3: fail when try to setup unsupported
	features

On Mon, Jun 28, 2010 at 10:45:57AM -0700, Shreyas Bhatewara wrote:
> > +vmxnet3_set_flags(struct net_device *netdev, u32 data)
> > +{
> >  	struct vmxnet3_adapter *adapter = netdev_priv(netdev);
> >  	u8 lro_requested = (data & ETH_FLAG_LRO) == 0 ? 0 : 1;
> >  	u8 lro_present = (netdev->features & NETIF_F_LRO) == 0 ? 0 : 1;
> > 
> > +	if (data & ~ETH_FLAG_LRO)
> > +		return -EOPNOTSUPP;
> > +
> >  	if (lro_requested ^ lro_present) {
> >  		/* toggle the LRO feature*/
> >  		netdev->features ^= NETIF_F_LRO;
> > --
> > 1.5.5.6
> 
> 
> Does not make sense to me. Switching LRO on/off is supported from the driver, why should the function return -EOPNOTSUPP ?

We return EOPNOTSUPP only if someone will try to setup other features
than LRO, if data == ETH_FLAG_LRO we will turn LRO on, and turn it off
when data == 0. 

Stanislaw
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