JME_TX_RING_SIZE
bzero(rd->jme_tx_ring, JME_TX_RING_SIZE);
error = bus_dmamap_create(sc->sc_dmat, JME_TX_RING_SIZE, 1,
JME_TX_RING_SIZE, 0, BUS_DMA_NOWAIT,
error = bus_dmamem_alloc(sc->sc_dmat, JME_TX_RING_SIZE, ETHER_ALIGN, 0,
nsegs, JME_TX_RING_SIZE, (caddr_t *)&sc->jme_rdata.jme_tx_ring,
JME_TX_RING_SIZE, NULL, BUS_DMA_NOWAIT);
tx_ring_end = sc->jme_rdata.jme_tx_ring_paddr + JME_TX_RING_SIZE;