/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2016 HGST, a Western Digital Company. */ #ifndef _RDMA_RW_H #define _RDMA_RW_H #include <linux/dma-mapping.h> #include <linux/scatterlist.h> #include <rdma/ib_verbs.h> #include <rdma/rdma_cm.h> #include <rdma/mr_pool.h> struct rdma_rw_ctx { /* number of RDMA READ/WRITE WRs (not counting MR WRs) */ u32 nr_ops; /* tag for the union below: */ u8 type; union { /* for mapping a single SGE: */ struct { struct ib_sge sge; struct ib_rdma_wr wr; } single; /* for mapping of multiple SGEs: */ struct { struct ib_sge *sges; struct ib_rdma_wr *wrs; } map; /* for registering multiple WRs: */ struct rdma_rw_reg_ctx { struct ib_sge sge; struct ib_rdma_wr wr; struct ib_reg_wr reg_wr; struct ib_send_wr inv_wr; struct ib_mr *mr; } *reg; }; }; int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 sg_offset, u64 remote_addr, u32 rkey, enum dma_data_direction dir); void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct scatterlist *sg, u32 sg_cnt, enum dma_data_direction dir); int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct scatterlist *sg, u32 sg_cnt, struct scatterlist *prot_sg, u32 prot_sg_cnt, struct ib_sig_attrs *sig_attrs, u64 remote_addr, u32 rkey, enum dma_data_direction dir); void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct scatterlist *sg, u32 sg_cnt, struct scatterlist *prot_sg, u32 prot_sg_cnt, enum dma_data_direction dir); struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr); int rdma_rw_ctx_post(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, struct ib_cqe *cqe, struct ib_send_wr *chain_wr); unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, unsigned int maxpages); void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr); int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr); void rdma_rw_cleanup_mrs(struct ib_qp *qp); #endif /* _RDMA_RW_H */