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a060b562 CH |
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 | ||
22 | struct 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; | |
50 | }; | |
51 | }; | |
52 | ||
53 | int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, | |
54 | struct scatterlist *sg, u32 sg_cnt, u32 sg_offset, | |
55 | u64 remote_addr, u32 rkey, enum dma_data_direction dir); | |
56 | void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, | |
57 | struct scatterlist *sg, u32 sg_cnt, | |
58 | enum dma_data_direction dir); | |
59 | ||
60 | struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, | |
61 | u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr); | |
62 | int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, | |
63 | struct ib_cqe *cqe, struct ib_send_wr *chain_wr); | |
64 | ||
65 | void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); | |
66 | int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); | |
67 | void rdma_rw_cleanup_mrs(struct ib_qp *qp); | |
68 | ||
69 | #endif /* _RDMA_RW_H */ |