VGE_RX_LIST_SZ
bzero(rd->vge_rx_ring, VGE_RX_LIST_SZ);
VGE_RX_LIST_SZ, /* maxsize */
VGE_RX_LIST_SZ, /* maxsegsize */
VGE_RX_LIST_SZ, vge_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
rx_ring_end = sc->vge_rdata.vge_rx_ring_paddr + VGE_RX_LIST_SZ;