net: dsa: add {get, set}_wol callbacks to slave devices

Allow switch drivers to implement per-port Wake-on-LAN getter and
setters.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/dsa.h

@@ -211,6 +211,14 @@ struct dsa_switch_driver {
 				     int port, uint64_t *data);
 	int	(*get_sset_count)(struct dsa_switch *ds);
 
+	/*
+	 * ethtool Wake-on-LAN
+	 */
+	void	(*get_wol)(struct dsa_switch *ds, int port,
+			   struct ethtool_wolinfo *w);
+	int	(*set_wol)(struct dsa_switch *ds, int port,
+			   struct ethtool_wolinfo *w);
+
 	/*
 	 * Suspend and resume
 	 */

net/dsa/slave.c

@@ -301,6 +301,27 @@ static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 	return -EOPNOTSUPP;
 }
 
+static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+
+	if (ds->drv->get_wol)
+		ds->drv->get_wol(ds, p->port, w);
+}
+
+static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
+{
+	struct dsa_slave_priv *p = netdev_priv(dev);
+	struct dsa_switch *ds = p->parent;
+	int ret = -EOPNOTSUPP;
+
+	if (ds->drv->set_wol)
+		ret = ds->drv->set_wol(ds, p->port, w);
+
+	return ret;
+}
+
 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 	.get_settings		= dsa_slave_get_settings,
 	.set_settings		= dsa_slave_set_settings,
@@ -310,6 +331,8 @@ static const struct ethtool_ops dsa_slave_ethtool_ops = {
 	.get_strings		= dsa_slave_get_strings,
 	.get_ethtool_stats	= dsa_slave_get_ethtool_stats,
 	.get_sset_count		= dsa_slave_get_sset_count,
+	.set_wol		= dsa_slave_set_wol,
+	.get_wol		= dsa_slave_get_wol,
 };
 
 static const struct net_device_ops dsa_slave_netdev_ops = {