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0062818298
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>
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/*
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* Copyright (c) 2016 HGST, a Western Digital Company.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef _RDMA_RW_H
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#define _RDMA_RW_H
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#include <linux/dma-mapping.h>
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#include <linux/scatterlist.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/rdma_cm.h>
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#include <rdma/mr_pool.h>
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struct rdma_rw_ctx {
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/* number of RDMA READ/WRITE WRs (not counting MR WRs) */
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u32 nr_ops;
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/* tag for the union below: */
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u8 type;
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union {
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/* for mapping a single SGE: */
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struct {
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struct ib_sge sge;
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struct ib_rdma_wr wr;
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} single;
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/* for mapping of multiple SGEs: */
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struct {
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struct ib_sge *sges;
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struct ib_rdma_wr *wrs;
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} map;
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/* for registering multiple WRs: */
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struct rdma_rw_reg_ctx {
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struct ib_sge sge;
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struct ib_rdma_wr wr;
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struct ib_reg_wr reg_wr;
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struct ib_send_wr inv_wr;
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struct ib_mr *mr;
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} *reg;
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struct {
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struct rdma_rw_reg_ctx data;
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struct rdma_rw_reg_ctx prot;
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struct ib_send_wr sig_inv_wr;
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struct ib_mr *sig_mr;
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struct ib_sge sig_sge;
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struct ib_sig_handover_wr sig_wr;
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} *sig;
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};
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};
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int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
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struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,
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u64 remote_addr, u32 rkey, enum dma_data_direction dir);
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void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
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struct scatterlist *sg, u32 sg_cnt,
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enum dma_data_direction dir);
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int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
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u8 port_num, struct scatterlist *sg, u32 sg_cnt,
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struct scatterlist *prot_sg, u32 prot_sg_cnt,
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struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey,
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enum dma_data_direction dir);
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void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
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u8 port_num, struct scatterlist *sg, u32 sg_cnt,
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struct scatterlist *prot_sg, u32 prot_sg_cnt,
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enum dma_data_direction dir);
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struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
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u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
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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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#endif /* _RDMA_RW_H */
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