Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
[linux-2.6-microblaze.git] / include / rdma / rw.h
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/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
14 struct 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
45 int 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);
48 void 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
52 int 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);
57 void 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
62 struct 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);
64 int 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
67 unsigned int rdma_rw_mr_factor(struct ib_device *device, u32 port_num,
68                 unsigned int maxpages);
69 void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr);
70 int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr);
71 void rdma_rw_cleanup_mrs(struct ib_qp *qp);
72
73 #endif /* _RDMA_RW_H */