MVXPE_RX_RING_MEM_PA
KASSERT(MVXPE_RX_RING_MEM_PA(sc, q) != 0);
MVXPE_WRITE(sc, MVXPE_PRXDQA(q), MVXPE_RX_RING_MEM_PA(sc, q));
KASSERT(MVXPE_READ(sc, MVXPE_PRXDQA(q)) == MVXPE_RX_RING_MEM_PA(sc, q));