MGB_DMAC_INTR_STS
CSR_WRITE_REG(sc, MGB_DMAC_INTR_STS, dmac_enable);
CSR_WRITE_REG(sc, MGB_DMAC_INTR_STS, UINT32_MAX);
CSR_WRITE_REG(sc, MGB_DMAC_INTR_STS, MGB_DMAC_RX_INTR_ENBL(qid));
CSR_WRITE_REG(sc, MGB_DMAC_INTR_STS, MGB_DMAC_TX_INTR_ENBL(qid));