GENET_RX_DMA_CONS_INDEX
printf("RX CIDX = %08x\n", RD4(sc, GENET_RX_DMA_CONS_INDEX(qid)));
WR4(sc, GENET_RX_DMA_CONS_INDEX(qid), 0);
WR4(sc, GENET_RX_DMA_CONS_INDEX(qid), sc->sc_rx.cidx);