net: xilinx: emaclite: add minimal ethtool ops

This set adds a minimal set of ethtool hooks to the driver, which provide a
decent amount of link information via ethtool.
With this change, running `ethtool ethX` in user-space provides all the
neatly-formatted information about the link (what was negotiated, what is
advertised, etc).

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/xilinx/xilinx_emaclite.c

@@ -17,6 +17,7 @@
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
+#include <linux/ethtool.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
@@ -1078,6 +1079,27 @@ static bool get_bool(struct platform_device *ofdev, const char *s)
 	return (bool)*p;
 }
 
+/**
+ * xemaclite_ethtools_get_drvinfo - Get various Axi Emac Lite driver info
+ * @ndev:       Pointer to net_device structure
+ * @ed:         Pointer to ethtool_drvinfo structure
+ *
+ * This implements ethtool command for getting the driver information.
+ * Issue "ethtool -i ethX" under linux prompt to execute this function.
+ */
+static void xemaclite_ethtools_get_drvinfo(struct net_device *ndev,
+					   struct ethtool_drvinfo *ed)
+{
+	strlcpy(ed->driver, DRIVER_NAME, sizeof(ed->driver));
+}
+
+static const struct ethtool_ops xemaclite_ethtool_ops = {
+	.get_drvinfo    = xemaclite_ethtools_get_drvinfo,
+	.get_link       = ethtool_op_get_link,
+	.get_link_ksettings = phy_ethtool_get_link_ksettings,
+	.set_link_ksettings = phy_ethtool_set_link_ksettings,
+};
+
 static const struct net_device_ops xemaclite_netdev_ops;
 
 /**
@@ -1164,6 +1186,7 @@ static int xemaclite_of_probe(struct platform_device *ofdev)
 	dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
 
 	ndev->netdev_ops = &xemaclite_netdev_ops;
+	ndev->ethtool_ops = &xemaclite_ethtool_ops;
 	ndev->flags &= ~IFF_MULTICAST;
 	ndev->watchdog_timeo = TX_TIMEOUT;