netdev - RE: [PATCH v3 net-next 6/8] lan743x: Add power management support

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Date:   Wed, 18 Jul 2018 21:55:24 +0000
From:   <Bryan.Whitehead@...rochip.com>
To:     <andrew@...n.ch>
CC:     <davem@...emloft.net>, <netdev@...r.kernel.org>,
        <UNGLinuxDriver@...rochip.com>
Subject: RE: [PATCH v3 net-next 6/8] lan743x: Add power management support

> > +#ifdef CONFIG_PM
> > +static void lan743x_ethtool_get_wol(struct net_device *netdev,
> > +				    struct ethtool_wolinfo *wol)
> > +{
> > +	struct lan743x_adapter *adapter = netdev_priv(netdev);
> > +
> > +	wol->supported = 0;
> > +	wol->wolopts = 0;
> > +	phy_ethtool_get_wol(netdev->phydev, wol);
> > +
> > +	wol->supported &= WAKE_BCAST | WAKE_UCAST | WAKE_MCAST |
> > +		WAKE_MAGIC | WAKE_PHY | WAKE_ARP;
> 
> Hi Bryan
> 
> Say the PHY set WAKE_MAGICSECURE, because it supports that. This AND
> then wipes it out, making the call to phy_ethtool_get_wol() pointless.
> In fact, should this AND be an OR?

Hi Andrew,
I assumed that "supported" means that it is supported by both the phy and mac driver, which is why I used the AND operator.
Am I mistaken? Is WAKE_MAGICSECURE a special case not requiring mac driver support?


> 
> > +
> > +#ifdef CONFIG_PM
> > +static int lan743x_ethtool_set_wol(struct net_device *netdev,
> > +				   struct ethtool_wolinfo *wol)
> > +{
> > +	struct lan743x_adapter *adapter = netdev_priv(netdev);
> > +
> > +	if (wol->wolopts & WAKE_MAGICSECURE)
> > +		return -EOPNOTSUPP;
> 
> The PHY might support this. Since you call phy_ethtool_set_wol(), you
> should give it the chance.
> 
Again, does WAKE_MAGICSECURE require mac driver support?
If so then it does not matter if the phy driver supports it.
If I misunderstand, can you explain, or direct me to documents.

Thanks,
Bryan