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