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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Copyright (c) 2016 HGST, a Western Digital Company.4 */5#ifndef _RDMA_RW_H6#define _RDMA_RW_H7 8#include <linux/dma-mapping.h>9#include <linux/scatterlist.h>10#include <rdma/ib_verbs.h>11#include <rdma/rdma_cm.h>12#include <rdma/mr_pool.h>13 14struct rdma_rw_ctx {15 /* number of RDMA READ/WRITE WRs (not counting MR WRs) */16 u32 nr_ops;17 18 /* tag for the union below: */19 u8 type;20 21 union {22 /* for mapping a single SGE: */23 struct {24 struct ib_sge sge;25 struct ib_rdma_wr wr;26 } single;27 28 /* for mapping of multiple SGEs: */29 struct {30 struct ib_sge *sges;31 struct ib_rdma_wr *wrs;32 } map;33 34 /* for registering multiple WRs: */35 struct rdma_rw_reg_ctx {36 struct ib_sge sge;37 struct ib_rdma_wr wr;38 struct ib_reg_wr reg_wr;39 struct ib_send_wr inv_wr;40 struct ib_mr *mr;41 } *reg;42 };43};44 45int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num,46 struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,47 u64 remote_addr, u32 rkey, enum dma_data_direction dir);48void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp,49 u32 port_num, struct scatterlist *sg, u32 sg_cnt,50 enum dma_data_direction dir);51 52int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,53 u32 port_num, struct scatterlist *sg, u32 sg_cnt,54 struct scatterlist *prot_sg, u32 prot_sg_cnt,55 struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey,56 enum dma_data_direction dir);57void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,58 u32 port_num, struct scatterlist *sg, u32 sg_cnt,59 struct scatterlist *prot_sg, u32 prot_sg_cnt,60 enum dma_data_direction dir);61 62struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,63 u32 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr);64int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num,65 struct ib_cqe *cqe, struct ib_send_wr *chain_wr);66 67unsigned int rdma_rw_mr_factor(struct ib_device *device, u32 port_num,68 unsigned int maxpages);69void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);70int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);71void rdma_rw_cleanup_mrs(struct ib_qp *qp);72 73#endif /* _RDMA_RW_H */74