int s2io_ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
static int s2io_ethtool_op_set_tx_csum(struct net_device *dev, u32 data)
int s2io_ethtool_op_set_tx_csum(struct net_device *dev, u32 data){	if (data)		dev->features |= NETIF_F_IP_CSUM;	else		dev->features &= ~NETIF_F_IP_CSUM;	return 0;}