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Merge branch 'drm-fixes-4.14' of git://people.freedesktop.org/~agd5f/linux into drm...
[mirror_ubuntu-bionic-kernel.git] / include / rdma / rw.h
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1/*
2 * Copyright (c) 2016 HGST, a Western Digital Company.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 */
13#ifndef _RDMA_RW_H
14#define _RDMA_RW_H
15
16#include <linux/dma-mapping.h>
17#include <linux/scatterlist.h>
18#include <rdma/ib_verbs.h>
19#include <rdma/rdma_cm.h>
20#include <rdma/mr_pool.h>
21
22struct rdma_rw_ctx {
23 /* number of RDMA READ/WRITE WRs (not counting MR WRs) */
24 u32 nr_ops;
25
26 /* tag for the union below: */
27 u8 type;
28
29 union {
30 /* for mapping a single SGE: */
31 struct {
32 struct ib_sge sge;
33 struct ib_rdma_wr wr;
34 } single;
35
36 /* for mapping of multiple SGEs: */
37 struct {
38 struct ib_sge *sges;
39 struct ib_rdma_wr *wrs;
40 } map;
41
42 /* for registering multiple WRs: */
43 struct rdma_rw_reg_ctx {
44 struct ib_sge sge;
45 struct ib_rdma_wr wr;
46 struct ib_reg_wr reg_wr;
47 struct ib_send_wr inv_wr;
48 struct ib_mr *mr;
49 } *reg;
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50
51 struct {
52 struct rdma_rw_reg_ctx data;
53 struct rdma_rw_reg_ctx prot;
54 struct ib_send_wr sig_inv_wr;
55 struct ib_mr *sig_mr;
56 struct ib_sge sig_sge;
57 struct ib_sig_handover_wr sig_wr;
58 } *sig;
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59 };
60};
61
62int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
63 struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,
64 u64 remote_addr, u32 rkey, enum dma_data_direction dir);
65void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
66 struct scatterlist *sg, u32 sg_cnt,
67 enum dma_data_direction dir);
68
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69int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
70 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
71 struct scatterlist *prot_sg, u32 prot_sg_cnt,
72 struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey,
73 enum dma_data_direction dir);
74void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
75 u8 port_num, struct scatterlist *sg, u32 sg_cnt,
76 struct scatterlist *prot_sg, u32 prot_sg_cnt,
77 enum dma_data_direction dir);
78
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79struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
80 u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
81int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num,
82 struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
83
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84unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num,
85 unsigned int maxpages);
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86void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);
87int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);
88void rdma_rw_cleanup_mrs(struct ib_qp *qp);
89
90#endif /* _RDMA_RW_H */