TULIP_RX_BUFLEN
KASSERT(segs[0].ds_len >= TULIP_RX_BUFLEN, ("receive buffer too small"));
desc->d_length1 = TULIP_RX_BUFLEN;
me->m_len = TULIP_RX_BUFLEN;
last_offset += TULIP_RX_BUFLEN;
ms->m_len = ms->m_pkthdr.len = TULIP_RX_BUFLEN;