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 */
74