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743 lines
20 KiB
743 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* Copyright (c) 2016 HGST, a Western Digital Company. |
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*/ |
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#include <linux/moduleparam.h> |
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#include <linux/slab.h> |
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#include <linux/pci-p2pdma.h> |
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#include <rdma/mr_pool.h> |
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#include <rdma/rw.h> |
|
|
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enum { |
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RDMA_RW_SINGLE_WR, |
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RDMA_RW_MULTI_WR, |
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RDMA_RW_MR, |
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RDMA_RW_SIG_MR, |
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}; |
|
|
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static bool rdma_rw_force_mr; |
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module_param_named(force_mr, rdma_rw_force_mr, bool, 0); |
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MODULE_PARM_DESC(force_mr, "Force usage of MRs for RDMA READ/WRITE operations"); |
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|
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/* |
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* Report whether memory registration should be used. Memory registration must |
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* be used for iWarp devices because of iWARP-specific limitations. Memory |
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* registration is also enabled if registering memory might yield better |
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* performance than using multiple SGE entries, see rdma_rw_io_needs_mr() |
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*/ |
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static inline bool rdma_rw_can_use_mr(struct ib_device *dev, u8 port_num) |
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{ |
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if (rdma_protocol_iwarp(dev, port_num)) |
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return true; |
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if (dev->attrs.max_sgl_rd) |
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return true; |
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if (unlikely(rdma_rw_force_mr)) |
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return true; |
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return false; |
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} |
|
|
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/* |
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* Check if the device will use memory registration for this RW operation. |
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* For RDMA READs we must use MRs on iWarp and can optionally use them as an |
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* optimization otherwise. Additionally we have a debug option to force usage |
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* of MRs to help testing this code path. |
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*/ |
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static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num, |
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enum dma_data_direction dir, int dma_nents) |
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{ |
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if (dir == DMA_FROM_DEVICE) { |
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if (rdma_protocol_iwarp(dev, port_num)) |
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return true; |
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if (dev->attrs.max_sgl_rd && dma_nents > dev->attrs.max_sgl_rd) |
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return true; |
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} |
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if (unlikely(rdma_rw_force_mr)) |
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return true; |
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return false; |
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} |
|
|
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static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev, |
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bool pi_support) |
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{ |
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u32 max_pages; |
|
|
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if (pi_support) |
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max_pages = dev->attrs.max_pi_fast_reg_page_list_len; |
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else |
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max_pages = dev->attrs.max_fast_reg_page_list_len; |
|
|
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/* arbitrary limit to avoid allocating gigantic resources */ |
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return min_t(u32, max_pages, 256); |
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} |
|
|
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static inline int rdma_rw_inv_key(struct rdma_rw_reg_ctx *reg) |
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{ |
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int count = 0; |
|
|
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if (reg->mr->need_inval) { |
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reg->inv_wr.opcode = IB_WR_LOCAL_INV; |
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reg->inv_wr.ex.invalidate_rkey = reg->mr->lkey; |
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reg->inv_wr.next = ®->reg_wr.wr; |
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count++; |
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} else { |
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reg->inv_wr.next = NULL; |
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} |
|
|
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return count; |
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} |
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|
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/* Caller must have zero-initialized *reg. */ |
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static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num, |
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struct rdma_rw_reg_ctx *reg, struct scatterlist *sg, |
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u32 sg_cnt, u32 offset) |
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{ |
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u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, |
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qp->integrity_en); |
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u32 nents = min(sg_cnt, pages_per_mr); |
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int count = 0, ret; |
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|
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reg->mr = ib_mr_pool_get(qp, &qp->rdma_mrs); |
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if (!reg->mr) |
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return -EAGAIN; |
|
|
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count += rdma_rw_inv_key(reg); |
|
|
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ret = ib_map_mr_sg(reg->mr, sg, nents, &offset, PAGE_SIZE); |
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if (ret < 0 || ret < nents) { |
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ib_mr_pool_put(qp, &qp->rdma_mrs, reg->mr); |
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return -EINVAL; |
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} |
|
|
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reg->reg_wr.wr.opcode = IB_WR_REG_MR; |
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reg->reg_wr.mr = reg->mr; |
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reg->reg_wr.access = IB_ACCESS_LOCAL_WRITE; |
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if (rdma_protocol_iwarp(qp->device, port_num)) |
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reg->reg_wr.access |= IB_ACCESS_REMOTE_WRITE; |
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count++; |
|
|
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reg->sge.addr = reg->mr->iova; |
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reg->sge.length = reg->mr->length; |
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return count; |
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} |
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|
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static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, |
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u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 offset, |
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u64 remote_addr, u32 rkey, enum dma_data_direction dir) |
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{ |
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struct rdma_rw_reg_ctx *prev = NULL; |
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u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, |
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qp->integrity_en); |
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int i, j, ret = 0, count = 0; |
|
|
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ctx->nr_ops = DIV_ROUND_UP(sg_cnt, pages_per_mr); |
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ctx->reg = kcalloc(ctx->nr_ops, sizeof(*ctx->reg), GFP_KERNEL); |
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if (!ctx->reg) { |
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ret = -ENOMEM; |
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goto out; |
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} |
|
|
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for (i = 0; i < ctx->nr_ops; i++) { |
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struct rdma_rw_reg_ctx *reg = &ctx->reg[i]; |
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u32 nents = min(sg_cnt, pages_per_mr); |
|
|
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ret = rdma_rw_init_one_mr(qp, port_num, reg, sg, sg_cnt, |
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offset); |
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if (ret < 0) |
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goto out_free; |
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count += ret; |
|
|
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if (prev) { |
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if (reg->mr->need_inval) |
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prev->wr.wr.next = ®->inv_wr; |
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else |
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prev->wr.wr.next = ®->reg_wr.wr; |
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} |
|
|
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reg->reg_wr.wr.next = ®->wr.wr; |
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|
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reg->wr.wr.sg_list = ®->sge; |
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reg->wr.wr.num_sge = 1; |
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reg->wr.remote_addr = remote_addr; |
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reg->wr.rkey = rkey; |
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if (dir == DMA_TO_DEVICE) { |
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reg->wr.wr.opcode = IB_WR_RDMA_WRITE; |
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} else if (!rdma_cap_read_inv(qp->device, port_num)) { |
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reg->wr.wr.opcode = IB_WR_RDMA_READ; |
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} else { |
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reg->wr.wr.opcode = IB_WR_RDMA_READ_WITH_INV; |
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reg->wr.wr.ex.invalidate_rkey = reg->mr->lkey; |
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} |
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count++; |
|
|
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remote_addr += reg->sge.length; |
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sg_cnt -= nents; |
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for (j = 0; j < nents; j++) |
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sg = sg_next(sg); |
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prev = reg; |
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offset = 0; |
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} |
|
|
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if (prev) |
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prev->wr.wr.next = NULL; |
|
|
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ctx->type = RDMA_RW_MR; |
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return count; |
|
|
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out_free: |
|
while (--i >= 0) |
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ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr); |
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kfree(ctx->reg); |
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out: |
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return ret; |
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} |
|
|
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static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, |
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struct scatterlist *sg, u32 sg_cnt, u32 offset, |
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u64 remote_addr, u32 rkey, enum dma_data_direction dir) |
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{ |
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u32 max_sge = dir == DMA_TO_DEVICE ? qp->max_write_sge : |
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qp->max_read_sge; |
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struct ib_sge *sge; |
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u32 total_len = 0, i, j; |
|
|
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ctx->nr_ops = DIV_ROUND_UP(sg_cnt, max_sge); |
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|
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ctx->map.sges = sge = kcalloc(sg_cnt, sizeof(*sge), GFP_KERNEL); |
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if (!ctx->map.sges) |
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goto out; |
|
|
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ctx->map.wrs = kcalloc(ctx->nr_ops, sizeof(*ctx->map.wrs), GFP_KERNEL); |
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if (!ctx->map.wrs) |
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goto out_free_sges; |
|
|
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for (i = 0; i < ctx->nr_ops; i++) { |
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struct ib_rdma_wr *rdma_wr = &ctx->map.wrs[i]; |
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u32 nr_sge = min(sg_cnt, max_sge); |
|
|
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if (dir == DMA_TO_DEVICE) |
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rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; |
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else |
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rdma_wr->wr.opcode = IB_WR_RDMA_READ; |
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rdma_wr->remote_addr = remote_addr + total_len; |
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rdma_wr->rkey = rkey; |
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rdma_wr->wr.num_sge = nr_sge; |
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rdma_wr->wr.sg_list = sge; |
|
|
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for (j = 0; j < nr_sge; j++, sg = sg_next(sg)) { |
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sge->addr = sg_dma_address(sg) + offset; |
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sge->length = sg_dma_len(sg) - offset; |
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sge->lkey = qp->pd->local_dma_lkey; |
|
|
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total_len += sge->length; |
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sge++; |
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sg_cnt--; |
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offset = 0; |
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} |
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|
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rdma_wr->wr.next = i + 1 < ctx->nr_ops ? |
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&ctx->map.wrs[i + 1].wr : NULL; |
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} |
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|
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ctx->type = RDMA_RW_MULTI_WR; |
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return ctx->nr_ops; |
|
|
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out_free_sges: |
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kfree(ctx->map.sges); |
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out: |
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return -ENOMEM; |
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} |
|
|
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static int rdma_rw_init_single_wr(struct rdma_rw_ctx *ctx, struct ib_qp *qp, |
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struct scatterlist *sg, u32 offset, u64 remote_addr, u32 rkey, |
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enum dma_data_direction dir) |
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{ |
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struct ib_rdma_wr *rdma_wr = &ctx->single.wr; |
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|
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ctx->nr_ops = 1; |
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|
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ctx->single.sge.lkey = qp->pd->local_dma_lkey; |
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ctx->single.sge.addr = sg_dma_address(sg) + offset; |
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ctx->single.sge.length = sg_dma_len(sg) - offset; |
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|
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memset(rdma_wr, 0, sizeof(*rdma_wr)); |
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if (dir == DMA_TO_DEVICE) |
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rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; |
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else |
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rdma_wr->wr.opcode = IB_WR_RDMA_READ; |
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rdma_wr->wr.sg_list = &ctx->single.sge; |
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rdma_wr->wr.num_sge = 1; |
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rdma_wr->remote_addr = remote_addr; |
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rdma_wr->rkey = rkey; |
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|
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ctx->type = RDMA_RW_SINGLE_WR; |
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return 1; |
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} |
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|
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static void rdma_rw_unmap_sg(struct ib_device *dev, struct scatterlist *sg, |
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u32 sg_cnt, enum dma_data_direction dir) |
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{ |
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if (is_pci_p2pdma_page(sg_page(sg))) |
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pci_p2pdma_unmap_sg(dev->dma_device, sg, sg_cnt, dir); |
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else |
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ib_dma_unmap_sg(dev, sg, sg_cnt, dir); |
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} |
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|
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static int rdma_rw_map_sg(struct ib_device *dev, struct scatterlist *sg, |
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u32 sg_cnt, enum dma_data_direction dir) |
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{ |
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if (is_pci_p2pdma_page(sg_page(sg))) { |
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if (WARN_ON_ONCE(ib_uses_virt_dma(dev))) |
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return 0; |
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return pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir); |
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} |
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return ib_dma_map_sg(dev, sg, sg_cnt, dir); |
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} |
|
|
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/** |
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* rdma_rw_ctx_init - initialize a RDMA READ/WRITE context |
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* @ctx: context to initialize |
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* @qp: queue pair to operate on |
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* @port_num: port num to which the connection is bound |
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* @sg: scatterlist to READ/WRITE from/to |
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* @sg_cnt: number of entries in @sg |
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* @sg_offset: current byte offset into @sg |
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* @remote_addr:remote address to read/write (relative to @rkey) |
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* @rkey: remote key to operate on |
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* @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ |
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* |
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* Returns the number of WQEs that will be needed on the workqueue if |
|
* successful, or a negative error code. |
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*/ |
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int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u8 port_num, |
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struct scatterlist *sg, u32 sg_cnt, u32 sg_offset, |
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u64 remote_addr, u32 rkey, enum dma_data_direction dir) |
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{ |
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struct ib_device *dev = qp->pd->device; |
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int ret; |
|
|
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ret = rdma_rw_map_sg(dev, sg, sg_cnt, dir); |
|
if (!ret) |
|
return -ENOMEM; |
|
sg_cnt = ret; |
|
|
|
/* |
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* Skip to the S/G entry that sg_offset falls into: |
|
*/ |
|
for (;;) { |
|
u32 len = sg_dma_len(sg); |
|
|
|
if (sg_offset < len) |
|
break; |
|
|
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sg = sg_next(sg); |
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sg_offset -= len; |
|
sg_cnt--; |
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} |
|
|
|
ret = -EIO; |
|
if (WARN_ON_ONCE(sg_cnt == 0)) |
|
goto out_unmap_sg; |
|
|
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if (rdma_rw_io_needs_mr(qp->device, port_num, dir, sg_cnt)) { |
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ret = rdma_rw_init_mr_wrs(ctx, qp, port_num, sg, sg_cnt, |
|
sg_offset, remote_addr, rkey, dir); |
|
} else if (sg_cnt > 1) { |
|
ret = rdma_rw_init_map_wrs(ctx, qp, sg, sg_cnt, sg_offset, |
|
remote_addr, rkey, dir); |
|
} else { |
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ret = rdma_rw_init_single_wr(ctx, qp, sg, sg_offset, |
|
remote_addr, rkey, dir); |
|
} |
|
|
|
if (ret < 0) |
|
goto out_unmap_sg; |
|
return ret; |
|
|
|
out_unmap_sg: |
|
rdma_rw_unmap_sg(dev, sg, sg_cnt, dir); |
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return ret; |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_init); |
|
|
|
/** |
|
* rdma_rw_ctx_signature_init - initialize a RW context with signature offload |
|
* @ctx: context to initialize |
|
* @qp: queue pair to operate on |
|
* @port_num: port num to which the connection is bound |
|
* @sg: scatterlist to READ/WRITE from/to |
|
* @sg_cnt: number of entries in @sg |
|
* @prot_sg: scatterlist to READ/WRITE protection information from/to |
|
* @prot_sg_cnt: number of entries in @prot_sg |
|
* @sig_attrs: signature offloading algorithms |
|
* @remote_addr:remote address to read/write (relative to @rkey) |
|
* @rkey: remote key to operate on |
|
* @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ |
|
* |
|
* Returns the number of WQEs that will be needed on the workqueue if |
|
* successful, or a negative error code. |
|
*/ |
|
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) |
|
{ |
|
struct ib_device *dev = qp->pd->device; |
|
u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, |
|
qp->integrity_en); |
|
struct ib_rdma_wr *rdma_wr; |
|
int count = 0, ret; |
|
|
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if (sg_cnt > pages_per_mr || prot_sg_cnt > pages_per_mr) { |
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pr_err("SG count too large: sg_cnt=%d, prot_sg_cnt=%d, pages_per_mr=%d\n", |
|
sg_cnt, prot_sg_cnt, pages_per_mr); |
|
return -EINVAL; |
|
} |
|
|
|
ret = rdma_rw_map_sg(dev, sg, sg_cnt, dir); |
|
if (!ret) |
|
return -ENOMEM; |
|
sg_cnt = ret; |
|
|
|
if (prot_sg_cnt) { |
|
ret = rdma_rw_map_sg(dev, prot_sg, prot_sg_cnt, dir); |
|
if (!ret) { |
|
ret = -ENOMEM; |
|
goto out_unmap_sg; |
|
} |
|
prot_sg_cnt = ret; |
|
} |
|
|
|
ctx->type = RDMA_RW_SIG_MR; |
|
ctx->nr_ops = 1; |
|
ctx->reg = kzalloc(sizeof(*ctx->reg), GFP_KERNEL); |
|
if (!ctx->reg) { |
|
ret = -ENOMEM; |
|
goto out_unmap_prot_sg; |
|
} |
|
|
|
ctx->reg->mr = ib_mr_pool_get(qp, &qp->sig_mrs); |
|
if (!ctx->reg->mr) { |
|
ret = -EAGAIN; |
|
goto out_free_ctx; |
|
} |
|
|
|
count += rdma_rw_inv_key(ctx->reg); |
|
|
|
memcpy(ctx->reg->mr->sig_attrs, sig_attrs, sizeof(struct ib_sig_attrs)); |
|
|
|
ret = ib_map_mr_sg_pi(ctx->reg->mr, sg, sg_cnt, NULL, prot_sg, |
|
prot_sg_cnt, NULL, SZ_4K); |
|
if (unlikely(ret)) { |
|
pr_err("failed to map PI sg (%d)\n", sg_cnt + prot_sg_cnt); |
|
goto out_destroy_sig_mr; |
|
} |
|
|
|
ctx->reg->reg_wr.wr.opcode = IB_WR_REG_MR_INTEGRITY; |
|
ctx->reg->reg_wr.wr.wr_cqe = NULL; |
|
ctx->reg->reg_wr.wr.num_sge = 0; |
|
ctx->reg->reg_wr.wr.send_flags = 0; |
|
ctx->reg->reg_wr.access = IB_ACCESS_LOCAL_WRITE; |
|
if (rdma_protocol_iwarp(qp->device, port_num)) |
|
ctx->reg->reg_wr.access |= IB_ACCESS_REMOTE_WRITE; |
|
ctx->reg->reg_wr.mr = ctx->reg->mr; |
|
ctx->reg->reg_wr.key = ctx->reg->mr->lkey; |
|
count++; |
|
|
|
ctx->reg->sge.addr = ctx->reg->mr->iova; |
|
ctx->reg->sge.length = ctx->reg->mr->length; |
|
if (sig_attrs->wire.sig_type == IB_SIG_TYPE_NONE) |
|
ctx->reg->sge.length -= ctx->reg->mr->sig_attrs->meta_length; |
|
|
|
rdma_wr = &ctx->reg->wr; |
|
rdma_wr->wr.sg_list = &ctx->reg->sge; |
|
rdma_wr->wr.num_sge = 1; |
|
rdma_wr->remote_addr = remote_addr; |
|
rdma_wr->rkey = rkey; |
|
if (dir == DMA_TO_DEVICE) |
|
rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; |
|
else |
|
rdma_wr->wr.opcode = IB_WR_RDMA_READ; |
|
ctx->reg->reg_wr.wr.next = &rdma_wr->wr; |
|
count++; |
|
|
|
return count; |
|
|
|
out_destroy_sig_mr: |
|
ib_mr_pool_put(qp, &qp->sig_mrs, ctx->reg->mr); |
|
out_free_ctx: |
|
kfree(ctx->reg); |
|
out_unmap_prot_sg: |
|
if (prot_sg_cnt) |
|
rdma_rw_unmap_sg(dev, prot_sg, prot_sg_cnt, dir); |
|
out_unmap_sg: |
|
rdma_rw_unmap_sg(dev, sg, sg_cnt, dir); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_signature_init); |
|
|
|
/* |
|
* Now that we are going to post the WRs we can update the lkey and need_inval |
|
* state on the MRs. If we were doing this at init time, we would get double |
|
* or missing invalidations if a context was initialized but not actually |
|
* posted. |
|
*/ |
|
static void rdma_rw_update_lkey(struct rdma_rw_reg_ctx *reg, bool need_inval) |
|
{ |
|
reg->mr->need_inval = need_inval; |
|
ib_update_fast_reg_key(reg->mr, ib_inc_rkey(reg->mr->lkey)); |
|
reg->reg_wr.key = reg->mr->lkey; |
|
reg->sge.lkey = reg->mr->lkey; |
|
} |
|
|
|
/** |
|
* rdma_rw_ctx_wrs - return chain of WRs for a RDMA READ or WRITE operation |
|
* @ctx: context to operate on |
|
* @qp: queue pair to operate on |
|
* @port_num: port num to which the connection is bound |
|
* @cqe: completion queue entry for the last WR |
|
* @chain_wr: WR to append to the posted chain |
|
* |
|
* Return the WR chain for the set of RDMA READ/WRITE operations described by |
|
* @ctx, as well as any memory registration operations needed. If @chain_wr |
|
* is non-NULL the WR it points to will be appended to the chain of WRs posted. |
|
* If @chain_wr is not set @cqe must be set so that the caller gets a |
|
* completion notification. |
|
*/ |
|
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) |
|
{ |
|
struct ib_send_wr *first_wr, *last_wr; |
|
int i; |
|
|
|
switch (ctx->type) { |
|
case RDMA_RW_SIG_MR: |
|
case RDMA_RW_MR: |
|
for (i = 0; i < ctx->nr_ops; i++) { |
|
rdma_rw_update_lkey(&ctx->reg[i], |
|
ctx->reg[i].wr.wr.opcode != |
|
IB_WR_RDMA_READ_WITH_INV); |
|
} |
|
|
|
if (ctx->reg[0].inv_wr.next) |
|
first_wr = &ctx->reg[0].inv_wr; |
|
else |
|
first_wr = &ctx->reg[0].reg_wr.wr; |
|
last_wr = &ctx->reg[ctx->nr_ops - 1].wr.wr; |
|
break; |
|
case RDMA_RW_MULTI_WR: |
|
first_wr = &ctx->map.wrs[0].wr; |
|
last_wr = &ctx->map.wrs[ctx->nr_ops - 1].wr; |
|
break; |
|
case RDMA_RW_SINGLE_WR: |
|
first_wr = &ctx->single.wr.wr; |
|
last_wr = &ctx->single.wr.wr; |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
if (chain_wr) { |
|
last_wr->next = chain_wr; |
|
} else { |
|
last_wr->wr_cqe = cqe; |
|
last_wr->send_flags |= IB_SEND_SIGNALED; |
|
} |
|
|
|
return first_wr; |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_wrs); |
|
|
|
/** |
|
* rdma_rw_ctx_post - post a RDMA READ or RDMA WRITE operation |
|
* @ctx: context to operate on |
|
* @qp: queue pair to operate on |
|
* @port_num: port num to which the connection is bound |
|
* @cqe: completion queue entry for the last WR |
|
* @chain_wr: WR to append to the posted chain |
|
* |
|
* Post the set of RDMA READ/WRITE operations described by @ctx, as well as |
|
* any memory registration operations needed. If @chain_wr is non-NULL the |
|
* WR it points to will be appended to the chain of WRs posted. If @chain_wr |
|
* is not set @cqe must be set so that the caller gets a completion |
|
* notification. |
|
*/ |
|
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) |
|
{ |
|
struct ib_send_wr *first_wr; |
|
|
|
first_wr = rdma_rw_ctx_wrs(ctx, qp, port_num, cqe, chain_wr); |
|
return ib_post_send(qp, first_wr, NULL); |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_post); |
|
|
|
/** |
|
* rdma_rw_ctx_destroy - release all resources allocated by rdma_rw_ctx_init |
|
* @ctx: context to release |
|
* @qp: queue pair to operate on |
|
* @port_num: port num to which the connection is bound |
|
* @sg: scatterlist that was used for the READ/WRITE |
|
* @sg_cnt: number of entries in @sg |
|
* @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ |
|
*/ |
|
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 i; |
|
|
|
switch (ctx->type) { |
|
case RDMA_RW_MR: |
|
for (i = 0; i < ctx->nr_ops; i++) |
|
ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->reg[i].mr); |
|
kfree(ctx->reg); |
|
break; |
|
case RDMA_RW_MULTI_WR: |
|
kfree(ctx->map.wrs); |
|
kfree(ctx->map.sges); |
|
break; |
|
case RDMA_RW_SINGLE_WR: |
|
break; |
|
default: |
|
BUG(); |
|
break; |
|
} |
|
|
|
rdma_rw_unmap_sg(qp->pd->device, sg, sg_cnt, dir); |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_destroy); |
|
|
|
/** |
|
* rdma_rw_ctx_destroy_signature - release all resources allocated by |
|
* rdma_rw_ctx_signature_init |
|
* @ctx: context to release |
|
* @qp: queue pair to operate on |
|
* @port_num: port num to which the connection is bound |
|
* @sg: scatterlist that was used for the READ/WRITE |
|
* @sg_cnt: number of entries in @sg |
|
* @prot_sg: scatterlist that was used for the READ/WRITE of the PI |
|
* @prot_sg_cnt: number of entries in @prot_sg |
|
* @dir: %DMA_TO_DEVICE for RDMA WRITE, %DMA_FROM_DEVICE for RDMA READ |
|
*/ |
|
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) |
|
{ |
|
if (WARN_ON_ONCE(ctx->type != RDMA_RW_SIG_MR)) |
|
return; |
|
|
|
ib_mr_pool_put(qp, &qp->sig_mrs, ctx->reg->mr); |
|
kfree(ctx->reg); |
|
|
|
if (prot_sg_cnt) |
|
rdma_rw_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir); |
|
rdma_rw_unmap_sg(qp->pd->device, sg, sg_cnt, dir); |
|
} |
|
EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature); |
|
|
|
/** |
|
* rdma_rw_mr_factor - return number of MRs required for a payload |
|
* @device: device handling the connection |
|
* @port_num: port num to which the connection is bound |
|
* @maxpages: maximum payload pages per rdma_rw_ctx |
|
* |
|
* Returns the number of MRs the device requires to move @maxpayload |
|
* bytes. The returned value is used during transport creation to |
|
* compute max_rdma_ctxts and the size of the transport's Send and |
|
* Send Completion Queues. |
|
*/ |
|
unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, |
|
unsigned int maxpages) |
|
{ |
|
unsigned int mr_pages; |
|
|
|
if (rdma_rw_can_use_mr(device, port_num)) |
|
mr_pages = rdma_rw_fr_page_list_len(device, false); |
|
else |
|
mr_pages = device->attrs.max_sge_rd; |
|
return DIV_ROUND_UP(maxpages, mr_pages); |
|
} |
|
EXPORT_SYMBOL(rdma_rw_mr_factor); |
|
|
|
void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr) |
|
{ |
|
u32 factor; |
|
|
|
WARN_ON_ONCE(attr->port_num == 0); |
|
|
|
/* |
|
* Each context needs at least one RDMA READ or WRITE WR. |
|
* |
|
* For some hardware we might need more, eventually we should ask the |
|
* HCA driver for a multiplier here. |
|
*/ |
|
factor = 1; |
|
|
|
/* |
|
* If the devices needs MRs to perform RDMA READ or WRITE operations, |
|
* we'll need two additional MRs for the registrations and the |
|
* invalidation. |
|
*/ |
|
if (attr->create_flags & IB_QP_CREATE_INTEGRITY_EN || |
|
rdma_rw_can_use_mr(dev, attr->port_num)) |
|
factor += 2; /* inv + reg */ |
|
|
|
attr->cap.max_send_wr += factor * attr->cap.max_rdma_ctxs; |
|
|
|
/* |
|
* But maybe we were just too high in the sky and the device doesn't |
|
* even support all we need, and we'll have to live with what we get.. |
|
*/ |
|
attr->cap.max_send_wr = |
|
min_t(u32, attr->cap.max_send_wr, dev->attrs.max_qp_wr); |
|
} |
|
|
|
int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr) |
|
{ |
|
struct ib_device *dev = qp->pd->device; |
|
u32 nr_mrs = 0, nr_sig_mrs = 0, max_num_sg = 0; |
|
int ret = 0; |
|
|
|
if (attr->create_flags & IB_QP_CREATE_INTEGRITY_EN) { |
|
nr_sig_mrs = attr->cap.max_rdma_ctxs; |
|
nr_mrs = attr->cap.max_rdma_ctxs; |
|
max_num_sg = rdma_rw_fr_page_list_len(dev, true); |
|
} else if (rdma_rw_can_use_mr(dev, attr->port_num)) { |
|
nr_mrs = attr->cap.max_rdma_ctxs; |
|
max_num_sg = rdma_rw_fr_page_list_len(dev, false); |
|
} |
|
|
|
if (nr_mrs) { |
|
ret = ib_mr_pool_init(qp, &qp->rdma_mrs, nr_mrs, |
|
IB_MR_TYPE_MEM_REG, |
|
max_num_sg, 0); |
|
if (ret) { |
|
pr_err("%s: failed to allocated %d MRs\n", |
|
__func__, nr_mrs); |
|
return ret; |
|
} |
|
} |
|
|
|
if (nr_sig_mrs) { |
|
ret = ib_mr_pool_init(qp, &qp->sig_mrs, nr_sig_mrs, |
|
IB_MR_TYPE_INTEGRITY, max_num_sg, max_num_sg); |
|
if (ret) { |
|
pr_err("%s: failed to allocated %d SIG MRs\n", |
|
__func__, nr_sig_mrs); |
|
goto out_free_rdma_mrs; |
|
} |
|
} |
|
|
|
return 0; |
|
|
|
out_free_rdma_mrs: |
|
ib_mr_pool_destroy(qp, &qp->rdma_mrs); |
|
return ret; |
|
} |
|
|
|
void rdma_rw_cleanup_mrs(struct ib_qp *qp) |
|
{ |
|
ib_mr_pool_destroy(qp, &qp->sig_mrs); |
|
ib_mr_pool_destroy(qp, &qp->rdma_mrs); |
|
}
|
|
|