static int xircom_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int xircom_open(struct net_device *dev);
static int xircom_close(struct net_device *dev);
static int xircom_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int xircom_open(struct net_device *dev);
static int xircom_close(struct net_device *dev);