SMSC75XX_TX_OVERHEAD 1500 drivers/net/usb/smsc75xx.c 	dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
SMSC75XX_TX_OVERHEAD 2260 drivers/net/usb/smsc75xx.c 	if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {