IPoIB: Allow disabling/enabling TSO on the fly through ethtool

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_ethtool.c

@@ -49,6 +49,25 @@ static u32 ipoib_get_rx_csum(struct net_device *dev)
 		!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
 }
 
+static int ipoib_set_tso(struct net_device *dev, u32 data)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+	if (data) {
+		if (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
+		    (dev->features & NETIF_F_SG) &&
+		    (priv->hca_caps & IB_DEVICE_UD_TSO)) {
+			dev->features |= NETIF_F_TSO;
+		} else {
+			ipoib_warn(priv, "can't set TSO on\n");
+			return -EOPNOTSUPP;
+		}
+	} else
+		dev->features &= ~NETIF_F_TSO;
+
+	return 0;
+}
+
 static int ipoib_get_coalesce(struct net_device *dev,
 			      struct ethtool_coalesce *coal)
 {
@@ -131,6 +150,7 @@ static void ipoib_get_ethtool_stats(struct net_device *dev,
 static const struct ethtool_ops ipoib_ethtool_ops = {
 	.get_drvinfo		= ipoib_get_drvinfo,
 	.get_rx_csum		= ipoib_get_rx_csum,
+	.set_tso		= ipoib_set_tso,
 	.get_coalesce		= ipoib_get_coalesce,
 	.set_coalesce		= ipoib_set_coalesce,
 	.get_flags		= ethtool_op_get_flags,