[NET]: Add ethtool support for NETIF_F_IPV6_CSUM devices.

Add ethtool utility function to set or clear IPV6_CSUM feature flag.
Modify tg3.c and bnx2.c to use this function when doing ethtool -K
to change tx checksum.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bnx2.c

@@ -6218,7 +6218,7 @@ bnx2_set_tx_csum(struct net_device *dev, u32 data)
 	struct bnx2 *bp = netdev_priv(dev);
 
 	if (CHIP_NUM(bp) == CHIP_NUM_5709)
-		return (ethtool_op_set_tx_hw_csum(dev, data));
+		return (ethtool_op_set_tx_ipv6_csum(dev, data));
 	else
 		return (ethtool_op_set_tx_csum(dev, data));
 }

drivers/net/tg3.c

@@ -8318,7 +8318,7 @@ static int tg3_set_tx_csum(struct net_device *dev, u32 data)
 
 	if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5755 ||
 	    GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5787)
-		ethtool_op_set_tx_hw_csum(dev, data);
+		ethtool_op_set_tx_ipv6_csum(dev, data);
 	else
 		ethtool_op_set_tx_csum(dev, data);
 

include/linux/ethtool.h

@@ -265,6 +265,7 @@ u32 ethtool_op_get_link(struct net_device *dev);
 u32 ethtool_op_get_tx_csum(struct net_device *dev);
 int ethtool_op_set_tx_csum(struct net_device *dev, u32 data);
 int ethtool_op_set_tx_hw_csum(struct net_device *dev, u32 data);
+int ethtool_op_set_tx_ipv6_csum(struct net_device *dev, u32 data);
 u32 ethtool_op_get_sg(struct net_device *dev);
 int ethtool_op_set_sg(struct net_device *dev, u32 data);
 u32 ethtool_op_get_tso(struct net_device *dev);

net/core/ethtool.c

@@ -52,6 +52,17 @@ int ethtool_op_set_tx_hw_csum(struct net_device *dev, u32 data)
 
 	return 0;
 }
+
+int ethtool_op_set_tx_ipv6_csum(struct net_device *dev, u32 data)
+{
+	if (data)
+		dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+	else
+		dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+
+	return 0;
+}
+
 u32 ethtool_op_get_sg(struct net_device *dev)
 {
 	return (dev->features & NETIF_F_SG) != 0;
@@ -980,5 +991,6 @@ EXPORT_SYMBOL(ethtool_op_set_sg);
 EXPORT_SYMBOL(ethtool_op_set_tso);
 EXPORT_SYMBOL(ethtool_op_set_tx_csum);
 EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
+EXPORT_SYMBOL(ethtool_op_set_tx_ipv6_csum);
 EXPORT_SYMBOL(ethtool_op_set_ufo);
 EXPORT_SYMBOL(ethtool_op_get_ufo);