| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | 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; |
| 59 | }; |
| 60 | }; |
| 61 | |
| 62 | int 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); |
| 65 | void 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 | |
| 69 | int 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); |
| 74 | void 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 | |
| 79 | struct 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); |
| 81 | int 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 | |
| 84 | unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, |
| 85 | unsigned int maxpages); |
| 86 | void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); |
| 87 | int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); |
| 88 | void rdma_rw_cleanup_mrs(struct ib_qp *qp); |
| 89 | |
| 90 | #endif /* _RDMA_RW_H */ |