DC_RXLEN
sc->dc_pnic_rx_buf = malloc(DC_RXLEN * 5, M_DEVBUF, M_NOWAIT);
sc->dc_ldata.dc_rx_list[i].dc_ctl = htole32(DC_RXCTL_RLINK | DC_RXLEN);
bzero(ptr, DC_RXLEN * 5);
bcopy(mtod(m, char *), ptr, DC_RXLEN);
ptr += DC_RXLEN;
sc->dc_ldata.dc_rx_list[i].dc_ctl = htole32(DC_RXCTL_RLINK | DC_RXLEN);