162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright (c) 2016 HGST, a Western Digital Company. 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci#ifndef _RDMA_RW_H 662306a36Sopenharmony_ci#define _RDMA_RW_H 762306a36Sopenharmony_ci 862306a36Sopenharmony_ci#include <linux/dma-mapping.h> 962306a36Sopenharmony_ci#include <linux/scatterlist.h> 1062306a36Sopenharmony_ci#include <rdma/ib_verbs.h> 1162306a36Sopenharmony_ci#include <rdma/rdma_cm.h> 1262306a36Sopenharmony_ci#include <rdma/mr_pool.h> 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_cistruct rdma_rw_ctx { 1562306a36Sopenharmony_ci /* number of RDMA READ/WRITE WRs (not counting MR WRs) */ 1662306a36Sopenharmony_ci u32 nr_ops; 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci /* tag for the union below: */ 1962306a36Sopenharmony_ci u8 type; 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci union { 2262306a36Sopenharmony_ci /* for mapping a single SGE: */ 2362306a36Sopenharmony_ci struct { 2462306a36Sopenharmony_ci struct ib_sge sge; 2562306a36Sopenharmony_ci struct ib_rdma_wr wr; 2662306a36Sopenharmony_ci } single; 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ci /* for mapping of multiple SGEs: */ 2962306a36Sopenharmony_ci struct { 3062306a36Sopenharmony_ci struct ib_sge *sges; 3162306a36Sopenharmony_ci struct ib_rdma_wr *wrs; 3262306a36Sopenharmony_ci } map; 3362306a36Sopenharmony_ci 3462306a36Sopenharmony_ci /* for registering multiple WRs: */ 3562306a36Sopenharmony_ci struct rdma_rw_reg_ctx { 3662306a36Sopenharmony_ci struct ib_sge sge; 3762306a36Sopenharmony_ci struct ib_rdma_wr wr; 3862306a36Sopenharmony_ci struct ib_reg_wr reg_wr; 3962306a36Sopenharmony_ci struct ib_send_wr inv_wr; 4062306a36Sopenharmony_ci struct ib_mr *mr; 4162306a36Sopenharmony_ci } *reg; 4262306a36Sopenharmony_ci }; 4362306a36Sopenharmony_ci}; 4462306a36Sopenharmony_ci 4562306a36Sopenharmony_ciint rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num, 4662306a36Sopenharmony_ci struct scatterlist *sg, u32 sg_cnt, u32 sg_offset, 4762306a36Sopenharmony_ci u64 remote_addr, u32 rkey, enum dma_data_direction dir); 4862306a36Sopenharmony_civoid rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 4962306a36Sopenharmony_ci u32 port_num, struct scatterlist *sg, u32 sg_cnt, 5062306a36Sopenharmony_ci enum dma_data_direction dir); 5162306a36Sopenharmony_ci 5262306a36Sopenharmony_ciint rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 5362306a36Sopenharmony_ci u32 port_num, struct scatterlist *sg, u32 sg_cnt, 5462306a36Sopenharmony_ci struct scatterlist *prot_sg, u32 prot_sg_cnt, 5562306a36Sopenharmony_ci struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey, 5662306a36Sopenharmony_ci enum dma_data_direction dir); 5762306a36Sopenharmony_civoid rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 5862306a36Sopenharmony_ci u32 port_num, struct scatterlist *sg, u32 sg_cnt, 5962306a36Sopenharmony_ci struct scatterlist *prot_sg, u32 prot_sg_cnt, 6062306a36Sopenharmony_ci enum dma_data_direction dir); 6162306a36Sopenharmony_ci 6262306a36Sopenharmony_cistruct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 6362306a36Sopenharmony_ci u32 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr); 6462306a36Sopenharmony_ciint rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num, 6562306a36Sopenharmony_ci struct ib_cqe *cqe, struct ib_send_wr *chain_wr); 6662306a36Sopenharmony_ci 6762306a36Sopenharmony_ciunsigned int rdma_rw_mr_factor(struct ib_device *device, u32 port_num, 6862306a36Sopenharmony_ci unsigned int maxpages); 6962306a36Sopenharmony_civoid rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); 7062306a36Sopenharmony_ciint rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); 7162306a36Sopenharmony_civoid rdma_rw_cleanup_mrs(struct ib_qp *qp); 7262306a36Sopenharmony_ci 7362306a36Sopenharmony_ci#endif /* _RDMA_RW_H */ 74