WPI_TX_CONFIG
WPI_WRITE(sc, WPI_TX_CONFIG(ring->qid), 0);
WPI_WRITE(sc, WPI_TX_CONFIG(6), 0);
WPI_WRITE(sc, WPI_TX_CONFIG(6), 0x80000001);
WPI_WRITE(sc, WPI_TX_CONFIG(qid), 0x80200008);