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rdma core: Add rdma_rw_mr_payload()
The amount of payload per MR depends on device capabilities and the memory registration mode in use. The new rdma_rw API hides both, making it difficult for ULPs to determine how large their transport send queues need to be. Expose the MR payload information via a new API. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Acked-by: Doug Ledford <dledford@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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@ -643,6 +643,30 @@ void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
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}
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EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature);
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/**
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* rdma_rw_mr_factor - return number of MRs required for a payload
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* @device: device handling the connection
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* @port_num: port num to which the connection is bound
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* @maxpages: maximum payload pages per rdma_rw_ctx
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*
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* Returns the number of MRs the device requires to move @maxpayload
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* bytes. The returned value is used during transport creation to
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* compute max_rdma_ctxts and the size of the transport's Send and
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* Send Completion Queues.
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*/
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unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,
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unsigned int maxpages)
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{
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unsigned int mr_pages;
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if (rdma_rw_can_use_mr(device, port_num))
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mr_pages = rdma_rw_fr_page_list_len(device);
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else
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mr_pages = device->attrs.max_sge_rd;
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return DIV_ROUND_UP(maxpages, mr_pages);
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}
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EXPORT_SYMBOL(rdma_rw_mr_factor);
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void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr)
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{
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u32 factor;
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@ -81,6 +81,8 @@ struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
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int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
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struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
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unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,
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unsigned int maxpages);
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void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);
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int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);
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void rdma_rw_cleanup_mrs(struct ib_qp *qp);
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