RVT_S_WAIT_DMA_DESC
qp->s_flags |= RVT_S_WAIT_DMA_DESC;
trace_hfi1_qpsleep(qp, RVT_S_WAIT_DMA_DESC);
hfi1_qp_wakeup(qp, RVT_S_WAIT_DMA_DESC);
RVT_S_WAIT_DMA_DESC | RVT_S_WAIT_KMEM)