[ETHTOOL]: Add {G,S}TSO support to ethtool_ops.

include/linux/ethtool.h

@@ -284,6 +284,8 @@ int ethtool_op_set_sg(struct net_device *dev, u32 data);
  * set_tx_csum: Turn transmit checksums on or off
  * get_sg: Report whether scatter-gather is enabled
  * set_sg: Turn scatter-gather on or off
+ * get_tso: Report whether TCP segmentation offload is enabled
+ * set_tso: Turn TCP segmentation offload on or off
  * self_test: Run specified self-tests
  * get_strings: Return a set of strings that describe the requested objects 
  * phys_id: Identify the device
@@ -337,6 +339,8 @@ struct ethtool_ops {
 	int	(*set_tx_csum)(struct net_device *, u32);
 	u32	(*get_sg)(struct net_device *);
 	int	(*set_sg)(struct net_device *, u32);
+	u32	(*get_tso)(struct net_device *);
+	int	(*set_tso)(struct net_device *, u32);
 	int	(*self_test_count)(struct net_device *);
 	void	(*self_test)(struct net_device *, struct ethtool_test *, u64 *);
 	void	(*get_strings)(struct net_device *, u32 stringset, u8 *);

net/core/ethtool.c

@@ -454,6 +454,33 @@ static int ethtool_set_sg(struct net_device *dev, char *useraddr)
 	return dev->ethtool_ops->set_sg(dev, edata.data);
 }
 
+static int ethtool_get_tso(struct net_device *dev, char *useraddr)
+{
+	struct ethtool_value edata = { ETHTOOL_GTSO };
+
+	if (!dev->ethtool_ops->get_tso)
+		return -EOPNOTSUPP;
+
+	edata.data = dev->ethtool_ops->get_tso(dev);
+
+	if (copy_to_user(useraddr, &edata, sizeof(edata)))
+		return -EFAULT;
+	return 0;
+}
+
+static int ethtool_set_tso(struct net_device *dev, char *useraddr)
+{
+	struct ethtool_value edata;
+
+	if (!dev->ethtool_ops->set_tso)
+		return -EOPNOTSUPP;
+
+	if (copy_from_user(&edata, useraddr, sizeof(edata)))
+		return -EFAULT;
+
+	return dev->ethtool_ops->set_tso(dev, edata.data);
+}
+
 static int ethtool_self_test(struct net_device *dev, char *useraddr)
 {
 	struct ethtool_test test;
@@ -653,6 +680,10 @@ int dev_ethtool(struct ifreq *ifr)
 		return ethtool_get_sg(dev, useraddr);
 	case ETHTOOL_SSG:
 		return ethtool_set_sg(dev, useraddr);
+	case ETHTOOL_GTSO:
+		return ethtool_get_tso(dev, useraddr);
+	case ETHTOOL_STSO:
+		return ethtool_set_tso(dev, useraddr);
 	case ETHTOOL_TEST:
 		return ethtool_self_test(dev, useraddr);
 	case ETHTOOL_GSTRINGS: