ixgb: 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:
 - ixgb has 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>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgb/ixgb.h

@@ -204,6 +204,8 @@ extern void ixgb_set_ethtool_ops(struct net_device *netdev);
 extern char ixgb_driver_name[];
 extern const char ixgb_driver_version[];
 
+extern void ixgb_set_speed_duplex(struct net_device *netdev);
+
 extern int ixgb_up(struct ixgb_adapter *adapter);
 extern void ixgb_down(struct ixgb_adapter *adapter, bool kill_watchdog);
 extern void ixgb_reset(struct ixgb_adapter *adapter);

drivers/net/ethernet/intel/ixgb/ixgb_ethtool.c

@@ -115,7 +115,7 @@ ixgb_get_settings(struct net_device *netdev, struct ethtool_cmd *ecmd)
 	return 0;
 }
 
-static void ixgb_set_speed_duplex(struct net_device *netdev)
+void ixgb_set_speed_duplex(struct net_device *netdev)
 {
 	struct ixgb_adapter *adapter = netdev_priv(netdev);
 	/* be optimistic about our link, since we were up before */
@@ -194,57 +194,6 @@ ixgb_set_pauseparam(struct net_device *netdev,
 	return 0;
 }
 
-static u32
-ixgb_get_rx_csum(struct net_device *netdev)
-{
-	struct ixgb_adapter *adapter = netdev_priv(netdev);
-
-	return adapter->rx_csum;
-}
-
-static int
-ixgb_set_rx_csum(struct net_device *netdev, u32 data)
-{
-	struct ixgb_adapter *adapter = netdev_priv(netdev);
-
-	adapter->rx_csum = data;
-
-	if (netif_running(netdev)) {
-		ixgb_down(adapter, true);
-		ixgb_up(adapter);
-		ixgb_set_speed_duplex(netdev);
-	} else
-		ixgb_reset(adapter);
-	return 0;
-}
-
-static u32
-ixgb_get_tx_csum(struct net_device *netdev)
-{
-	return (netdev->features & NETIF_F_HW_CSUM) != 0;
-}
-
-static int
-ixgb_set_tx_csum(struct net_device *netdev, u32 data)
-{
-	if (data)
-		netdev->features |= NETIF_F_HW_CSUM;
-	else
-		netdev->features &= ~NETIF_F_HW_CSUM;
-
-	return 0;
-}
-
-static int
-ixgb_set_tso(struct net_device *netdev, u32 data)
-{
-	if (data)
-		netdev->features |= NETIF_F_TSO;
-	else
-		netdev->features &= ~NETIF_F_TSO;
-	return 0;
-}
-
 static u32
 ixgb_get_msglevel(struct net_device *netdev)
 {
@@ -736,14 +685,8 @@ static const struct ethtool_ops ixgb_ethtool_ops = {
 	.set_ringparam = ixgb_set_ringparam,
 	.get_pauseparam	= ixgb_get_pauseparam,
 	.set_pauseparam	= ixgb_set_pauseparam,
-	.get_rx_csum = ixgb_get_rx_csum,
-	.set_rx_csum = ixgb_set_rx_csum,
-	.get_tx_csum = ixgb_get_tx_csum,
-	.set_tx_csum = ixgb_set_tx_csum,
-	.set_sg	= ethtool_op_set_sg,
 	.get_msglevel = ixgb_get_msglevel,
 	.set_msglevel = ixgb_set_msglevel,
-	.set_tso = ixgb_set_tso,
 	.get_strings = ixgb_get_strings,
 	.set_phys_id = ixgb_set_phys_id,
 	.get_sset_count = ixgb_get_sset_count,

drivers/net/ethernet/intel/ixgb/ixgb_main.c

@@ -325,6 +325,28 @@ ixgb_reset(struct ixgb_adapter *adapter)
 	}
 }
 
+static int
+ixgb_set_features(struct net_device *netdev, u32 features)
+{
+	struct ixgb_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)) {
+		ixgb_down(adapter, true);
+		ixgb_up(adapter);
+		ixgb_set_speed_duplex(netdev);
+	} else
+		ixgb_reset(adapter);
+
+	return 0;
+}
+
+
 static const struct net_device_ops ixgb_netdev_ops = {
 	.ndo_open 		= ixgb_open,
 	.ndo_stop		= ixgb_close,
@@ -340,6 +362,7 @@ static const struct net_device_ops ixgb_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= ixgb_netpoll,
 #endif
+	.ndo_set_features       = ixgb_set_features,
 };
 
 /**
@@ -439,12 +462,14 @@ ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (err)
 		goto err_sw_init;
 
-	netdev->features = NETIF_F_SG |
-			   NETIF_F_HW_CSUM |
+	netdev->hw_features = NETIF_F_SG |
+			   NETIF_F_TSO |
+			   NETIF_F_HW_CSUM;
+	netdev->features = netdev->hw_features |
 			   NETIF_F_HW_VLAN_TX |
 			   NETIF_F_HW_VLAN_RX |
 			   NETIF_F_HW_VLAN_FILTER;
-	netdev->features |= NETIF_F_TSO;
+	netdev->hw_features |= NETIF_F_RXCSUM;
 
 	if (pci_using_dac) {
 		netdev->features |= NETIF_F_HIGHDMA;