diff options
| -rw-r--r-- | drivers/infiniband/core/rw.c | 24 | ||||
| -rw-r--r-- | include/rdma/rw.h | 2 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index dbfd854c32c9..6ca607e8e293 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -643,6 +643,30 @@ void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp, } EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature); +/** + * rdma_rw_mr_factor - return number of MRs required for a payload + * @device: device handling the connection + * @port_num: port num to which the connection is bound + * @maxpages: maximum payload pages per rdma_rw_ctx + * + * Returns the number of MRs the device requires to move @maxpayload + * bytes. The returned value is used during transport creation to + * compute max_rdma_ctxts and the size of the transport's Send and + * Send Completion Queues. + */ +unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, + unsigned int maxpages) +{ + unsigned int mr_pages; + + if (rdma_rw_can_use_mr(device, port_num)) + mr_pages = rdma_rw_fr_page_list_len(device); + else + mr_pages = device->attrs.max_sge_rd; + return DIV_ROUND_UP(maxpages, mr_pages); +} +EXPORT_SYMBOL(rdma_rw_mr_factor); + void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr) { u32 factor; diff --git a/include/rdma/rw.h b/include/rdma/rw.h index 377d865e506d..a3cbbc7b6417 100644 --- a/include/rdma/rw.h +++ b/include/rdma/rw.h @@ -81,6 +81,8 @@ struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr); +unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, + unsigned int maxpages); void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); void rdma_rw_cleanup_mrs(struct ib_qp *qp); |