WNTASK_ACK
#define WR_ISACK(wr) ((((kmdb_wr_t *)(wr))->wn_task) & WNTASK_ACK)
#define WR_ACK(wr) (((kmdb_wr_t *)(wr))->wn_task) |= WNTASK_ACK
#define WR_TASK(wr) ((((kmdb_wr_t *)(wr))->wn_task) & ~WNTASK_ACK)