Signed-off-by: Christoph Hellwig <h...@lst.de> --- drivers/infiniband/core/cq.c | 46 ++++++++++++++++++++++++++++++++++++++++++++ include/rdma/ib_verbs.h | 2 ++ 2 files changed, 48 insertions(+)
diff --git a/drivers/infiniband/core/cq.c b/drivers/infiniband/core/cq.c index d9eb796..bf2a079 100644 --- a/drivers/infiniband/core/cq.c +++ b/drivers/infiniband/core/cq.c @@ -206,3 +206,49 @@ void ib_free_cq(struct ib_cq *cq) WARN_ON_ONCE(ret); } EXPORT_SYMBOL(ib_free_cq); + +struct ib_stop_cqe { + struct ib_cqe cqe; + struct completion done; +}; + +static void ib_stop_done(struct ib_cq *cq, struct ib_wc *wc) +{ + struct ib_stop_cqe *stop = + container_of(wc->wr_cqe, struct ib_stop_cqe, cqe); + + complete(&stop->done); +} + +/* + * Change a queue pair into the error state and wait until all receive + * completions have been processed before destroying it. This avoids that + * the receive completion handler can access the queue pair while it is + * being destroyed. + */ +void ib_drain_qp(struct ib_qp *qp) +{ + struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR }; + struct ib_stop_cqe stop = { }; + struct ib_recv_wr wr, *bad_wr; + int ret; + + wr.wr_cqe = &stop.cqe; + stop.cqe.done = ib_stop_done; + init_completion(&stop.done); + + ret = ib_modify_qp(qp, &attr, IB_QP_STATE); + if (ret) { + WARN_ONCE(ret, "failed to drain QP: %d\n", ret); + return; + } + + ret = ib_post_recv(qp, &wr, &bad_wr); + if (ret) { + WARN_ONCE(ret, "failed to drain QP: %d\n", ret); + return; + } + + wait_for_completion(&stop.done); +} +EXPORT_SYMBOL(ib_drain_qp); diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index e11e038..f59a8d3 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -3075,4 +3075,6 @@ int ib_sg_to_pages(struct ib_mr *mr, int sg_nents, int (*set_page)(struct ib_mr *, u64)); +void ib_drain_qp(struct ib_qp *qp); + #endif /* IB_VERBS_H */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html