projects/linux·blob master · refs

95 lines · 3.0 KiB

1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2016 HGST, a Western Digital Company.
4 */
5#ifndef _RDMA_RW_H
6#define _RDMA_RW_H
7
8#include <linux/bvec.h>
9#include <linux/dma-mapping.h>
10#include <linux/scatterlist.h>
11#include <rdma/ib_verbs.h>
12#include <rdma/rdma_cm.h>
13#include <rdma/mr_pool.h>
14
15struct rdma_rw_ctx {
16 /* number of RDMA READ/WRITE WRs (not counting MR WRs) */
17 u32 nr_ops;
18
19 /* tag for the union below: */
20 u8 type;
21
22 union {
23 /* for mapping a single SGE: */
24 struct {
25 struct ib_sge sge;
26 struct ib_rdma_wr wr;
27 } single;
28
29 /* for mapping of multiple SGEs: */
30 struct {
31 struct ib_sge *sges;
32 struct ib_rdma_wr *wrs;
33 } map;
34
35 /* for IOVA-based mapping of bvecs into contiguous DMA range: */
36 struct {
37 struct dma_iova_state state;
38 struct ib_sge sge;
39 struct ib_rdma_wr wr;
40 size_t mapped_len;
41 } iova;
42
43 /* for registering multiple WRs: */
44 struct rdma_rw_reg_ctx {
45 struct ib_sge sge;
46 struct ib_rdma_wr wr;
47 struct ib_reg_wr reg_wr;
48 struct ib_send_wr inv_wr;
49 struct ib_mr *mr;
50 struct sg_table sgt;
51 } *reg;
52 };
53};
54
55int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num,
56 struct scatterlist *sg, u32 sg_cnt, u32 sg_offset,
57 u64 remote_addr, u32 rkey, enum dma_data_direction dir);
58void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
59 u32 port_num, struct scatterlist *sg, u32 sg_cnt,
60 enum dma_data_direction dir);
61
62struct bio_vec;
63
64int rdma_rw_ctx_init_bvec(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
65 u32 port_num, const struct bio_vec *bvecs, u32 nr_bvec,
66 struct bvec_iter iter, u64 remote_addr, u32 rkey,
67 enum dma_data_direction dir);
68void rdma_rw_ctx_destroy_bvec(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
69 u32 port_num, const struct bio_vec *bvecs, u32 nr_bvec,
70 enum dma_data_direction dir);
71
72int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
73 u32 port_num, struct scatterlist *sg, u32 sg_cnt,
74 struct scatterlist *prot_sg, u32 prot_sg_cnt,
75 struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey,
76 enum dma_data_direction dir);
77void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
78 u32 port_num, struct scatterlist *sg, u32 sg_cnt,
79 struct scatterlist *prot_sg, u32 prot_sg_cnt,
80 enum dma_data_direction dir);
81
82struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
83 u32 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
84int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num,
85 struct ib_cqe *cqe, struct ib_send_wr *chain_wr);
86
87unsigned int rdma_rw_mr_factor(struct ib_device *device, u32 port_num,
88 unsigned int maxpages);
89unsigned int rdma_rw_max_send_wr(struct ib_device *dev, u32 port_num,
90 unsigned int max_rdma_ctxs, u32 create_flags);
91void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);
92int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);
93void rdma_rw_cleanup_mrs(struct ib_qp *qp);
94
95#endif /* _RDMA_RW_H */