usbnet: improve generic ethtool support

This adds generic support for the ethtool commands get_settings,
set_settings, get_link and nway_reset to usbnet. These are now
implemented using mii functions when a low-level driver supports
mdio_read/mdio_write and does not override the usbnet ethtool
commands with its own.

Currently, this applies to the asix and the mcs7830 drivers.
I have tested it on mcs7830.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: David Hollis <dhollis@davehollis.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/net/asix.c

@@ -700,32 +700,6 @@ static void asix_get_drvinfo (struct net_device *net,
 	info->eedump_len = data->eeprom_len;
 }
 
-static int asix_get_settings(struct net_device *net, struct ethtool_cmd *cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-
-	return mii_ethtool_gset(&dev->mii,cmd);
-}
-
-static int asix_set_settings(struct net_device *net, struct ethtool_cmd *cmd)
-{
-	struct usbnet *dev = netdev_priv(net);
-	int res = mii_ethtool_sset(&dev->mii,cmd);
-
-	/* link speed/duplex might have changed */
-	if (dev->driver_info->link_reset)
-		dev->driver_info->link_reset(dev);
-
-	return res;
-}
-
-static int asix_nway_reset(struct net_device *net)
-{
-	struct usbnet *dev = netdev_priv(net);
-
-	return mii_nway_restart(&dev->mii);
-}
-
 static u32 asix_get_link(struct net_device *net)
 {
 	struct usbnet *dev = netdev_priv(net);
@@ -746,15 +720,15 @@ static int asix_ioctl (struct net_device *net, struct ifreq *rq, int cmd)
 static struct ethtool_ops ax88172_ethtool_ops = {
 	.get_drvinfo		= asix_get_drvinfo,
 	.get_link		= asix_get_link,
-	.nway_reset		= asix_nway_reset,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
 	.get_wol		= asix_get_wol,
 	.set_wol		= asix_set_wol,
 	.get_eeprom_len		= asix_get_eeprom_len,
 	.get_eeprom		= asix_get_eeprom,
-	.get_settings		= asix_get_settings,
-	.set_settings		= asix_set_settings,
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.nway_reset		= usbnet_nway_reset,
 };
 
 static void ax88172_set_multicast(struct net_device *net)
@@ -885,15 +859,15 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
 static struct ethtool_ops ax88772_ethtool_ops = {
 	.get_drvinfo		= asix_get_drvinfo,
 	.get_link		= asix_get_link,
-	.nway_reset		= asix_nway_reset,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
 	.get_wol		= asix_get_wol,
 	.set_wol		= asix_set_wol,
 	.get_eeprom_len		= asix_get_eeprom_len,
 	.get_eeprom		= asix_get_eeprom,
-	.get_settings		= asix_get_settings,
-	.set_settings		= asix_set_settings,
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.nway_reset		= usbnet_nway_reset,
 };
 
 static int ax88772_link_reset(struct usbnet *dev)
@@ -1046,15 +1020,15 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
 static struct ethtool_ops ax88178_ethtool_ops = {
 	.get_drvinfo		= asix_get_drvinfo,
 	.get_link		= asix_get_link,
-	.nway_reset		= asix_nway_reset,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
 	.get_wol		= asix_get_wol,
 	.set_wol		= asix_set_wol,
 	.get_eeprom_len		= asix_get_eeprom_len,
 	.get_eeprom		= asix_get_eeprom,
-	.get_settings		= asix_get_settings,
-	.set_settings		= asix_set_settings,
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.nway_reset		= usbnet_nway_reset,
 };
 
 static int marvell_phy_init(struct usbnet *dev)

drivers/usb/net/mcs7830.c

@@ -430,8 +430,12 @@ static struct ethtool_ops mcs7830_ethtool_ops = {
 	.get_regs		= mcs7830_get_regs,
 
 	/* common usbnet calls */
+	.get_link		= usbnet_get_link,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.nway_reset		= usbnet_nway_reset,
 };
 
 static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)

drivers/usb/net/usbnet.c

@@ -669,6 +669,37 @@ static int usbnet_open (struct net_device *net)
  * they'll probably want to use this base set.
  */
 
+int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	if (!dev->mii.mdio_read)
+		return -EOPNOTSUPP;
+
+	return mii_ethtool_gset(&dev->mii, cmd);
+}
+EXPORT_SYMBOL_GPL(usbnet_get_settings);
+
+int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+	int retval;
+
+	if (!dev->mii.mdio_write)
+		return -EOPNOTSUPP;
+
+	retval = mii_ethtool_sset(&dev->mii, cmd);
+
+	/* link speed/duplex might have changed */
+	if (dev->driver_info->link_reset)
+		dev->driver_info->link_reset(dev);
+
+	return retval;
+
+}
+EXPORT_SYMBOL_GPL(usbnet_set_settings);
+
+
 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
 {
 	struct usbnet *dev = netdev_priv(net);
@@ -682,7 +713,7 @@ void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
 }
 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
 
-static u32 usbnet_get_link (struct net_device *net)
+u32 usbnet_get_link (struct net_device *net)
 {
 	struct usbnet *dev = netdev_priv(net);
 
@@ -690,9 +721,14 @@ static u32 usbnet_get_link (struct net_device *net)
 	if (dev->driver_info->check_connect)
 		return dev->driver_info->check_connect (dev) == 0;
 
+	/* if the device has mii operations, use those */
+	if (dev->mii.mdio_read)
+		return mii_link_ok(&dev->mii);
+
 	/* Otherwise, say we're up (to avoid breaking scripts) */
 	return 1;
 }
+EXPORT_SYMBOL_GPL(usbnet_get_link);
 
 u32 usbnet_get_msglevel (struct net_device *net)
 {
@@ -710,10 +746,24 @@ void usbnet_set_msglevel (struct net_device *net, u32 level)
 }
 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
 
+int usbnet_nway_reset(struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	if (!dev->mii.mdio_write)
+		return -EOPNOTSUPP;
+
+	return mii_nway_restart(&dev->mii);
+}
+EXPORT_SYMBOL_GPL(usbnet_nway_reset);
+
 /* drivers may override default ethtool_ops in their bind() routine */
 static struct ethtool_ops usbnet_ethtool_ops = {
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
 	.get_drvinfo		= usbnet_get_drvinfo,
 	.get_link		= usbnet_get_link,
+	.nway_reset		= usbnet_nway_reset,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
 };

drivers/usb/net/usbnet.h

@@ -168,9 +168,13 @@ extern void usbnet_defer_kevent (struct usbnet *, int);
 extern void usbnet_skb_return (struct usbnet *, struct sk_buff *);
 extern void usbnet_unlink_rx_urbs(struct usbnet *);
 
+extern int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd);
+extern int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd);
+extern u32 usbnet_get_link (struct net_device *net);
 extern u32 usbnet_get_msglevel (struct net_device *);
 extern void usbnet_set_msglevel (struct net_device *, u32);
 extern void usbnet_get_drvinfo (struct net_device *, struct ethtool_drvinfo *);
+extern int usbnet_nway_reset(struct net_device *net);
 
 /* messaging support includes the interface name, so it must not be
  * used before it has one ... notably, in minidriver bind() calls.