IE_TBUF_SIZE
ptr += IE_TBUF_SIZE;
if (m0->m_pkthdr.len > IE_TBUF_SIZE)
ptr += NTXBUF * IE_TBUF_SIZE;
#define IE_MAXMCAST (IE_TBUF_SIZE/6)/* must fit in transmit buffer */
#define IE_XBUF_ADDR(sc, i) (sc->xbufs + ((i) * IE_TBUF_SIZE))