net/faraday: Enable offload checksum according to device-tree

This enables IP/UDP/TCP offload checksum according to information
passed on from bootloader through device-tree. The offload doesn't
working properly when the interface works in NCSI mode.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>

Author: Gavin Shan

drivers/net/ethernet/faraday/ftgmac100.c

@@ -1377,7 +1377,11 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 	netdev->ethtool_ops = &ftgmac100_ethtool_ops;
 	netdev->netdev_ops = &ftgmac100_netdev_ops;
-	netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
+	if (pdev->dev.of_node &&
+	    of_get_property(pdev->dev.of_node, "no-hw-checksum", NULL))
+		netdev->features = NETIF_F_GRO;
+	else
+		netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
 
 	platform_set_drvdata(pdev, netdev);