Added support for kernel 4.6

For 4.6 kernel several ethtool API functions has been removed.
If vrouter is building for 4.6 new API should be used instead.

Close-bug: #1633387

Change-Id: Ibb83f611616cba952b1ba7da4e548fccd55d0037

linux/vr_host_interface.c

@@ -1569,17 +1569,29 @@ linux_if_get_settings(struct vr_interface *vif,
     rtnl_lock();
 
     if (netif_running(dev)) {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0))
+        /* ethtool_link_ksettings introduced since kernel 4.6. ethtool_cmd has been removed */
+        struct ethtool_link_ksettings ekmd;
+        ekmd.base.cmd = ETHTOOL_GSET;
+        if  (!(ret = __ethtool_get_link_ksettings(dev, &ekmd))) {
+            settings->vis_speed = ekmd.base.speed;
+            settings->vis_duplex = ekmd.base.duplex;
+#endif
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0) && LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0))
         struct ethtool_cmd cmd;
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
-        /* As per lxr, this API was introduced in 3.2.0 */ 
+        /* As per lxr, this API was introduced in 3.2.0 */
         if (!(ret = __ethtool_get_settings(dev, &cmd))) {
             settings->vis_speed = ethtool_cmd_speed(&cmd);
-#else
+            settings->vis_duplex = cmd.duplex;
+#endif
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0))
+        struct ethtool_cmd cmd;
         cmd.cmd = ETHTOOL_GSET;
         if  (!(ret = dev_ethtool_get_settings(dev, &cmd))) {
             settings->vis_speed = cmd.speed;
-#endif
             settings->vis_duplex = cmd.duplex;
+#endif
+
         }
     }