ETHERNET_HEADER_SIZE
(void *)(mp->b_rptr + ETHERNET_HEADER_SIZE);
tcplen = lro->len - sizeof (*ip) - ETHERNET_HEADER_SIZE;
trim = tot_len - (ip_len + ETHERNET_HEADER_SIZE);
hlen = ip_len + ETHERNET_HEADER_SIZE - tcp_data_len;
ip->ip_len = htons(lro->len - ETHERNET_HEADER_SIZE);
#ifndef ETHERNET_HEADER_SIZE