From e9a53e73a2507f3a1680538bd167b2e49533659a Mon Sep 17 00:00:00 2001 From: Israel Rukshin Date: Tue, 11 Jun 2019 18:52:53 +0300 Subject: [PATCH] RDMA/rw: Use IB_WR_REG_MR_INTEGRITY for PI handover Replace the old signature handover API with the new one. The new API simplifes PI handover code complexity for ULPs and improve performance. For RW API it will reduce the maximum number of work requests per task and the need of dealing with multiple MRs (and their registrations and invalidations) per task. All the mappings and registration of the data and the protection buffers is done by the LLD using a single WR and a special MR type (IB_MR_TYPE_INTEGRITY) for the PI handover operation. The setup of the tested benchmark (using iSER ULP): - 2 servers with 24 cores (1 initiator and 1 target) - ConnectX-4/ConnectX-5 adapters - 24 target sessions with 1 LUN each - ramdisk backstore - PI active Performance results running fio (24 jobs, 128 iodepth) using write_generate=1 and read_verify=1 (w/w.o patch): bs IOPS(read) IOPS(write) ---- ---------- ---------- 512 1243.3K/1182.3K 1725.1K/1680.2K 4k 571233/528835 743293/748259 32k 72388/71086 71789/93573 Using write_generate=0 and read_verify=0 (w/w.o patch): bs IOPS(read) IOPS(write) ---- ---------- ---------- 512 1572.1K/1427.2K 1823.5K/1724.3K 4k 921992/916194 753772/768267 32k 75052/73960 73180/95484 There is a performance degradation when writing big block sizes. Degradation is caused by the complexity of combining multiple indirections and perform RDMA READ operation from it. This will be fixed in the following patches by reducing the indirections if possible. Signed-off-by: Israel Rukshin Reviewed-by: Max Gurtovoy Reviewed-by: Christoph Hellwig Signed-off-by: Jason Gunthorpe --- drivers/infiniband/core/rw.c | 167 +++++++++++++------------------- drivers/infiniband/ulp/isert/ib_isert.c | 4 +- include/rdma/rw.h | 9 -- 3 files changed, 72 insertions(+), 108 deletions(-) diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index f87f0de..cc5feb3 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -59,10 +59,18 @@ static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num, return false; } -static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev) +static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev, + bool pi_support) { + u32 max_pages; + + if (pi_support) + max_pages = dev->attrs.max_pi_fast_reg_page_list_len; + else + max_pages = dev->attrs.max_fast_reg_page_list_len; + /* arbitrary limit to avoid allocating gigantic resources */ - return min_t(u32, dev->attrs.max_fast_reg_page_list_len, 256); + return min_t(u32, max_pages, 256); } static inline int rdma_rw_inv_key(struct rdma_rw_reg_ctx *reg) @@ -86,7 +94,8 @@ static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num, struct rdma_rw_reg_ctx *reg, struct scatterlist *sg, u32 sg_cnt, u32 offset) { - u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device); + u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, + qp->integrity_en); u32 nents = min(sg_cnt, pages_per_mr); int count = 0, ret; @@ -119,7 +128,8 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u64 remote_addr, u32 rkey, enum dma_data_direction dir) { struct rdma_rw_reg_ctx *prev = NULL; - u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device); + u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, + qp->integrity_en); int i, j, ret = 0, count = 0; ctx->nr_ops = (sg_cnt + pages_per_mr - 1) / pages_per_mr; @@ -360,9 +370,9 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, 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); + u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device, + qp->integrity_en); struct ib_rdma_wr *rdma_wr; - struct ib_send_wr *prev_wr = NULL; int count = 0, ret; if (sg_cnt > pages_per_mr || prot_sg_cnt > pages_per_mr) { @@ -376,75 +386,58 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, return -ENOMEM; sg_cnt = ret; - ret = ib_dma_map_sg(dev, prot_sg, prot_sg_cnt, dir); - if (!ret) { - ret = -ENOMEM; - goto out_unmap_sg; + if (prot_sg_cnt) { + ret = ib_dma_map_sg(dev, prot_sg, prot_sg_cnt, dir); + if (!ret) { + ret = -ENOMEM; + goto out_unmap_sg; + } + prot_sg_cnt = ret; } - prot_sg_cnt = ret; ctx->type = RDMA_RW_SIG_MR; ctx->nr_ops = 1; - ctx->sig = kcalloc(1, sizeof(*ctx->sig), GFP_KERNEL); - if (!ctx->sig) { + ctx->reg = kcalloc(1, sizeof(*ctx->reg), GFP_KERNEL); + if (!ctx->reg) { ret = -ENOMEM; goto out_unmap_prot_sg; } - ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->data, sg, sg_cnt, 0); - if (ret < 0) - goto out_free_ctx; - count += ret; - prev_wr = &ctx->sig->data.reg_wr.wr; - - ret = rdma_rw_init_one_mr(qp, port_num, &ctx->sig->prot, - prot_sg, prot_sg_cnt, 0); - if (ret < 0) - goto out_destroy_data_mr; - count += ret; - - if (ctx->sig->prot.inv_wr.next) - prev_wr->next = &ctx->sig->prot.inv_wr; - else - prev_wr->next = &ctx->sig->prot.reg_wr.wr; - prev_wr = &ctx->sig->prot.reg_wr.wr; - - ctx->sig->sig_mr = ib_mr_pool_get(qp, &qp->sig_mrs); - if (!ctx->sig->sig_mr) { + ctx->reg->mr = ib_mr_pool_get(qp, &qp->sig_mrs); + if (!ctx->reg->mr) { ret = -EAGAIN; - goto out_destroy_prot_mr; + goto out_free_ctx; } - if (ctx->sig->sig_mr->need_inval) { - memset(&ctx->sig->sig_inv_wr, 0, sizeof(ctx->sig->sig_inv_wr)); + count += rdma_rw_inv_key(ctx->reg); - ctx->sig->sig_inv_wr.opcode = IB_WR_LOCAL_INV; - ctx->sig->sig_inv_wr.ex.invalidate_rkey = ctx->sig->sig_mr->rkey; + memcpy(ctx->reg->mr->sig_attrs, sig_attrs, sizeof(struct ib_sig_attrs)); - prev_wr->next = &ctx->sig->sig_inv_wr; - prev_wr = &ctx->sig->sig_inv_wr; + 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->sig->sig_wr.wr.opcode = IB_WR_REG_SIG_MR; - ctx->sig->sig_wr.wr.wr_cqe = NULL; - ctx->sig->sig_wr.wr.sg_list = &ctx->sig->data.sge; - ctx->sig->sig_wr.wr.num_sge = 1; - ctx->sig->sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE; - ctx->sig->sig_wr.sig_attrs = sig_attrs; - ctx->sig->sig_wr.sig_mr = ctx->sig->sig_mr; - if (prot_sg_cnt) - ctx->sig->sig_wr.prot = &ctx->sig->prot.sge; - prev_wr->next = &ctx->sig->sig_wr.wr; - prev_wr = &ctx->sig->sig_wr.wr; + 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->sig->sig_sge.addr = 0; - ctx->sig->sig_sge.length = ctx->sig->data.sge.length; - if (sig_attrs->wire.sig_type != IB_SIG_TYPE_NONE) - ctx->sig->sig_sge.length += ctx->sig->prot.sge.length; + 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->sig->data.wr; - rdma_wr->wr.sg_list = &ctx->sig->sig_sge; + 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; @@ -452,21 +445,18 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, rdma_wr->wr.opcode = IB_WR_RDMA_WRITE; else rdma_wr->wr.opcode = IB_WR_RDMA_READ; - prev_wr->next = &rdma_wr->wr; - prev_wr = &rdma_wr->wr; + ctx->reg->reg_wr.wr.next = &rdma_wr->wr; count++; return count; -out_destroy_prot_mr: - if (prot_sg_cnt) - ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr); -out_destroy_data_mr: - ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr); +out_destroy_sig_mr: + ib_mr_pool_put(qp, &qp->sig_mrs, ctx->reg->mr); out_free_ctx: - kfree(ctx->sig); + kfree(ctx->reg); out_unmap_prot_sg: - ib_dma_unmap_sg(dev, prot_sg, prot_sg_cnt, dir); + if (prot_sg_cnt) + ib_dma_unmap_sg(dev, prot_sg, prot_sg_cnt, dir); out_unmap_sg: ib_dma_unmap_sg(dev, sg, sg_cnt, dir); return ret; @@ -509,22 +499,8 @@ struct ib_send_wr *rdma_rw_ctx_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, switch (ctx->type) { case RDMA_RW_SIG_MR: - rdma_rw_update_lkey(&ctx->sig->data, true); - if (ctx->sig->prot.mr) - rdma_rw_update_lkey(&ctx->sig->prot, true); - - ctx->sig->sig_mr->need_inval = true; - ib_update_fast_reg_key(ctx->sig->sig_mr, - ib_inc_rkey(ctx->sig->sig_mr->lkey)); - ctx->sig->sig_sge.lkey = ctx->sig->sig_mr->lkey; - - if (ctx->sig->data.inv_wr.next) - first_wr = &ctx->sig->data.inv_wr; - else - first_wr = &ctx->sig->data.reg_wr.wr; - last_wr = &ctx->sig->data.wr.wr; - break; case RDMA_RW_MR: + /* fallthrough */ for (i = 0; i < ctx->nr_ops; i++) { rdma_rw_update_lkey(&ctx->reg[i], ctx->reg[i].wr.wr.opcode != @@ -641,16 +617,12 @@ void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp, if (WARN_ON_ONCE(ctx->type != RDMA_RW_SIG_MR)) return; - ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->data.mr); - ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir); + ib_mr_pool_put(qp, &qp->sig_mrs, ctx->reg->mr); + kfree(ctx->reg); - if (ctx->sig->prot.mr) { - ib_mr_pool_put(qp, &qp->rdma_mrs, ctx->sig->prot.mr); + ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir); + if (prot_sg_cnt) ib_dma_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir); - } - - ib_mr_pool_put(qp, &qp->sig_mrs, ctx->sig->sig_mr); - kfree(ctx->sig); } EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature); @@ -671,7 +643,7 @@ unsigned int rdma_rw_mr_factor(struct ib_device *device, u8 port_num, unsigned int mr_pages; if (rdma_rw_can_use_mr(device, port_num)) - mr_pages = rdma_rw_fr_page_list_len(device); + 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); @@ -697,9 +669,8 @@ void rdma_rw_init_qp(struct ib_device *dev, struct ib_qp_init_attr *attr) * we'll need two additional MRs for the registrations and the * invalidation. */ - if (attr->create_flags & IB_QP_CREATE_INTEGRITY_EN) - factor += 6; /* (inv + reg) * (data + prot + sig) */ - else if (rdma_rw_can_use_mr(dev, attr->port_num)) + 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; @@ -715,20 +686,22 @@ 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) { struct ib_device *dev = qp->pd->device; - u32 nr_mrs = 0, nr_sig_mrs = 0; + 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 * 2; + 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, - rdma_rw_fr_page_list_len(dev), 0); + max_num_sg, 0); if (ret) { pr_err("%s: failed to allocated %d MRs\n", __func__, nr_mrs); @@ -738,7 +711,7 @@ int rdma_rw_init_mrs(struct ib_qp *qp, struct ib_qp_init_attr *attr) if (nr_sig_mrs) { ret = ib_mr_pool_init(qp, &qp->sig_mrs, nr_sig_mrs, - IB_MR_TYPE_SIGNATURE, 2, 0); + 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); diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c index 53bc505..4b4998e 100644 --- a/drivers/infiniband/ulp/isert/ib_isert.c +++ b/drivers/infiniband/ulp/isert/ib_isert.c @@ -1677,7 +1677,7 @@ isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc) isert_dbg("Cmd %p\n", isert_cmd); - ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr); + ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr); isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); if (ret) { @@ -1723,7 +1723,7 @@ isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc) iscsit_stop_dataout_timer(cmd); if (isert_prot_cmd(isert_conn, se_cmd)) - ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr); + ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr); isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn); cmd->write_data_done = 0; diff --git a/include/rdma/rw.h b/include/rdma/rw.h index a3cbbc7..bcb2212 100644 --- a/include/rdma/rw.h +++ b/include/rdma/rw.h @@ -47,15 +47,6 @@ struct rdma_rw_ctx { struct ib_send_wr inv_wr; struct ib_mr *mr; } *reg; - - struct { - struct rdma_rw_reg_ctx data; - struct rdma_rw_reg_ctx prot; - struct ib_send_wr sig_inv_wr; - struct ib_mr *sig_mr; - struct ib_sge sig_sge; - struct ib_sig_handover_wr sig_wr; - } *sig; }; }; -- 2.7.4