AGE_RX_RING_SZ
AGE_RX_RING_SZ, age_dmamap_cb, &ctx, 0);
bzero(rd->age_rx_ring, AGE_RX_RING_SZ);
rx_ring_end = sc->age_rdata.age_rx_ring_paddr + AGE_RX_RING_SZ;
AGE_RX_RING_SZ, /* maxsize */
AGE_RX_RING_SZ, /* maxsegsize */