e1000: convert to ndo_fix_features

Private rx_csum flags are now duplicate of netdev->features & NETIF_F_RXCSUM.
Removing this needs deeper surgery.

Things noticed:
 - RX csum disabled by default
 - HW VLAN acceleration probably can be toggled, but it's left as is
 - the resets on RX csum offload change can probably be avoided
 - there is A LOT of copy-and-pasted code here
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/e1000/e1000_ethtool.c

@@ -290,69 +290,6 @@ static int e1000_set_pauseparam(struct net_device *netdev,
 	return retval;
 }
 
-static u32 e1000_get_rx_csum(struct net_device *netdev)
-{
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-	return adapter->rx_csum;
-}
-
-static int e1000_set_rx_csum(struct net_device *netdev, u32 data)
-{
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-	adapter->rx_csum = data;
-
-	if (netif_running(netdev))
-		e1000_reinit_locked(adapter);
-	else
-		e1000_reset(adapter);
-	return 0;
-}
-
-static u32 e1000_get_tx_csum(struct net_device *netdev)
-{
-	return (netdev->features & NETIF_F_HW_CSUM) != 0;
-}
-
-static int e1000_set_tx_csum(struct net_device *netdev, u32 data)
-{
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-	struct e1000_hw *hw = &adapter->hw;
-
-	if (hw->mac_type < e1000_82543) {
-		if (!data)
-			return -EINVAL;
-		return 0;
-	}
-
-	if (data)
-		netdev->features |= NETIF_F_HW_CSUM;
-	else
-		netdev->features &= ~NETIF_F_HW_CSUM;
-
-	return 0;
-}
-
-static int e1000_set_tso(struct net_device *netdev, u32 data)
-{
-	struct e1000_adapter *adapter = netdev_priv(netdev);
-	struct e1000_hw *hw = &adapter->hw;
-
-	if ((hw->mac_type < e1000_82544) ||
-	    (hw->mac_type == e1000_82547))
-		return data ? -EINVAL : 0;
-
-	if (data)
-		netdev->features |= NETIF_F_TSO;
-	else
-		netdev->features &= ~NETIF_F_TSO;
-
-	netdev->features &= ~NETIF_F_TSO6;
-
-	e_info(probe, "TSO is %s\n", data ? "Enabled" : "Disabled");
-	adapter->tso_force = true;
-	return 0;
-}
-
 static u32 e1000_get_msglevel(struct net_device *netdev)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
@@ -1905,12 +1842,6 @@ static const struct ethtool_ops e1000_ethtool_ops = {
 	.set_ringparam          = e1000_set_ringparam,
 	.get_pauseparam         = e1000_get_pauseparam,
 	.set_pauseparam         = e1000_set_pauseparam,
-	.get_rx_csum            = e1000_get_rx_csum,
-	.set_rx_csum            = e1000_set_rx_csum,
-	.get_tx_csum            = e1000_get_tx_csum,
-	.set_tx_csum            = e1000_set_tx_csum,
-	.set_sg                 = ethtool_op_set_sg,
-	.set_tso                = e1000_set_tso,
 	.self_test              = e1000_diag_test,
 	.get_strings            = e1000_get_strings,
 	.set_phys_id            = e1000_set_phys_id,

drivers/net/e1000/e1000_main.c

@@ -797,6 +797,24 @@ static int e1000_is_need_ioport(struct pci_dev *pdev)
 	}
 }
 
+static int e1000_set_features(struct net_device *netdev, u32 features)
+{
+	struct e1000_adapter *adapter = netdev_priv(netdev);
+	u32 changed = features ^ netdev->features;
+
+	if (!(changed & NETIF_F_RXCSUM))
+		return 0;
+
+	adapter->rx_csum = !!(features & NETIF_F_RXCSUM);
+
+	if (netif_running(netdev))
+		e1000_reinit_locked(adapter);
+	else
+		e1000_reset(adapter);
+
+	return 0;
+}
+
 static const struct net_device_ops e1000_netdev_ops = {
 	.ndo_open		= e1000_open,
 	.ndo_stop		= e1000_close,
@@ -815,6 +833,7 @@ static const struct net_device_ops e1000_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= e1000_netpoll,
 #endif
+	.ndo_set_features       = e1000_set_features,
 };
 
 /**
@@ -1016,16 +1035,19 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
 	}
 
 	if (hw->mac_type >= e1000_82543) {
-		netdev->features = NETIF_F_SG |
-				   NETIF_F_HW_CSUM |
-				   NETIF_F_HW_VLAN_TX |
+		netdev->hw_features = NETIF_F_SG |
+				   NETIF_F_HW_CSUM;
+		netdev->features = NETIF_F_HW_VLAN_TX |
 				   NETIF_F_HW_VLAN_RX |
 				   NETIF_F_HW_VLAN_FILTER;
 	}
 
 	if ((hw->mac_type >= e1000_82544) &&
 	   (hw->mac_type != e1000_82547))
-		netdev->features |= NETIF_F_TSO;
+		netdev->hw_features |= NETIF_F_TSO;
+
+	netdev->features |= netdev->hw_features;
+	netdev->hw_features |= NETIF_F_RXCSUM;
 
 	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;