diff options
Diffstat (limited to 'drivers/infiniband/ulp/iser/iser_memory.c')
| -rw-r--r-- | drivers/infiniband/ulp/iser/iser_memory.c | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c new file mode 100644 index 000000000..519fea5ec --- /dev/null +++ b/drivers/infiniband/ulp/iser/iser_memory.c @@ -0,0 +1,393 @@ +/* + * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. + * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/highmem.h> +#include <linux/scatterlist.h> + +#include "iscsi_iser.h" + +void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc) +{ + iser_err_comp(wc, "memreg"); +} + +static struct iser_fr_desc * +iser_reg_desc_get_fr(struct ib_conn *ib_conn) +{ + struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; + struct iser_fr_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&fr_pool->lock, flags); + desc = list_first_entry(&fr_pool->list, + struct iser_fr_desc, list); + list_del(&desc->list); + spin_unlock_irqrestore(&fr_pool->lock, flags); + + return desc; +} + +static void +iser_reg_desc_put_fr(struct ib_conn *ib_conn, + struct iser_fr_desc *desc) +{ + struct iser_fr_pool *fr_pool = &ib_conn->fr_pool; + unsigned long flags; + + spin_lock_irqsave(&fr_pool->lock, flags); + list_add(&desc->list, &fr_pool->list); + spin_unlock_irqrestore(&fr_pool->lock, flags); +} + +int iser_dma_map_task_data(struct iscsi_iser_task *iser_task, + struct iser_data_buf *data, + enum iser_data_dir iser_dir, + enum dma_data_direction dma_dir) +{ + struct ib_device *dev; + + iser_task->dir[iser_dir] = 1; + dev = iser_task->iser_conn->ib_conn.device->ib_device; + + data->dma_nents = ib_dma_map_sg(dev, data->sg, data->size, dma_dir); + if (unlikely(data->dma_nents == 0)) { + iser_err("dma_map_sg failed!!!\n"); + return -EINVAL; + } + return 0; +} + +void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, + struct iser_data_buf *data, + enum dma_data_direction dir) +{ + struct ib_device *dev; + + dev = iser_task->iser_conn->ib_conn.device->ib_device; + ib_dma_unmap_sg(dev, data->sg, data->size, dir); +} + +static int +iser_reg_dma(struct iser_device *device, struct iser_data_buf *mem, + struct iser_mem_reg *reg) +{ + struct scatterlist *sg = mem->sg; + + reg->sge.lkey = device->pd->local_dma_lkey; + /* + * FIXME: rework the registration code path to differentiate + * rkey/lkey use cases + */ + + if (device->pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY) + reg->rkey = device->pd->unsafe_global_rkey; + else + reg->rkey = 0; + reg->sge.addr = sg_dma_address(&sg[0]); + reg->sge.length = sg_dma_len(&sg[0]); + + iser_dbg("Single DMA entry: lkey=0x%x, rkey=0x%x, addr=0x%llx," + " length=0x%x\n", reg->sge.lkey, reg->rkey, + reg->sge.addr, reg->sge.length); + + return 0; +} + +void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, + enum iser_data_dir cmd_dir) +{ + struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir]; + struct iser_fr_desc *desc; + struct ib_mr_status mr_status; + + desc = reg->mem_h; + if (!desc) + return; + + /* + * The signature MR cannot be invalidated and reused without checking. + * libiscsi calls the check_protection transport handler only if + * SCSI-Response is received. And the signature MR is not checked if + * the task is completed for some other reason like a timeout or error + * handling. That's why we must check the signature MR here before + * putting it to the free pool. + */ + if (unlikely(desc->sig_protected)) { + desc->sig_protected = false; + ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS, + &mr_status); + } + iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->mem_h); + reg->mem_h = NULL; +} + +static void +iser_set_dif_domain(struct scsi_cmnd *sc, struct ib_sig_domain *domain) +{ + domain->sig_type = IB_SIG_TYPE_T10_DIF; + domain->sig.dif.pi_interval = scsi_prot_interval(sc); + domain->sig.dif.ref_tag = t10_pi_ref_tag(sc->request); + /* + * At the moment we hard code those, but in the future + * we will take them from sc. + */ + domain->sig.dif.apptag_check_mask = 0xffff; + domain->sig.dif.app_escape = true; + domain->sig.dif.ref_escape = true; + if (sc->prot_flags & SCSI_PROT_REF_INCREMENT) + domain->sig.dif.ref_remap = true; +}; + +static int +iser_set_sig_attrs(struct scsi_cmnd *sc, struct ib_sig_attrs *sig_attrs) +{ + switch (scsi_get_prot_op(sc)) { + case SCSI_PROT_WRITE_INSERT: + case SCSI_PROT_READ_STRIP: + sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE; + iser_set_dif_domain(sc, &sig_attrs->wire); + sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; + break; + case SCSI_PROT_READ_INSERT: + case SCSI_PROT_WRITE_STRIP: + sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE; + iser_set_dif_domain(sc, &sig_attrs->mem); + sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ? + IB_T10DIF_CSUM : IB_T10DIF_CRC; + break; + case SCSI_PROT_READ_PASS: + case SCSI_PROT_WRITE_PASS: + iser_set_dif_domain(sc, &sig_attrs->wire); + sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC; + iser_set_dif_domain(sc, &sig_attrs->mem); + sig_attrs->mem.sig.dif.bg_type = sc->prot_flags & SCSI_PROT_IP_CHECKSUM ? + IB_T10DIF_CSUM : IB_T10DIF_CRC; + break; + default: + iser_err("Unsupported PI operation %d\n", + scsi_get_prot_op(sc)); + return -EINVAL; + } + + return 0; +} + +static inline void +iser_set_prot_checks(struct scsi_cmnd *sc, u8 *mask) +{ + *mask = 0; + if (sc->prot_flags & SCSI_PROT_REF_CHECK) + *mask |= IB_SIG_CHECK_REFTAG; + if (sc->prot_flags & SCSI_PROT_GUARD_CHECK) + *mask |= IB_SIG_CHECK_GUARD; +} + +static inline void +iser_inv_rkey(struct ib_send_wr *inv_wr, + struct ib_mr *mr, + struct ib_cqe *cqe, + struct ib_send_wr *next_wr) +{ + inv_wr->opcode = IB_WR_LOCAL_INV; + inv_wr->wr_cqe = cqe; + inv_wr->ex.invalidate_rkey = mr->rkey; + inv_wr->send_flags = 0; + inv_wr->num_sge = 0; + inv_wr->next = next_wr; +} + +static int +iser_reg_sig_mr(struct iscsi_iser_task *iser_task, + struct iser_data_buf *mem, + struct iser_data_buf *sig_mem, + struct iser_reg_resources *rsc, + struct iser_mem_reg *sig_reg) +{ + struct iser_tx_desc *tx_desc = &iser_task->desc; + struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe; + struct ib_mr *mr = rsc->sig_mr; + struct ib_sig_attrs *sig_attrs = mr->sig_attrs; + struct ib_reg_wr *wr = &tx_desc->reg_wr; + int ret; + + memset(sig_attrs, 0, sizeof(*sig_attrs)); + ret = iser_set_sig_attrs(iser_task->sc, sig_attrs); + if (ret) + goto err; + + iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask); + + if (rsc->sig_mr->need_inval) + iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr); + + ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey)); + + ret = ib_map_mr_sg_pi(mr, mem->sg, mem->dma_nents, NULL, + sig_mem->sg, sig_mem->dma_nents, NULL, SZ_4K); + if (unlikely(ret)) { + iser_err("failed to map PI sg (%d)\n", + mem->dma_nents + sig_mem->dma_nents); + goto err; + } + + memset(wr, 0, sizeof(*wr)); + wr->wr.next = &tx_desc->send_wr; + wr->wr.opcode = IB_WR_REG_MR_INTEGRITY; + wr->wr.wr_cqe = cqe; + wr->wr.num_sge = 0; + wr->wr.send_flags = 0; + wr->mr = mr; + wr->key = mr->rkey; + wr->access = IB_ACCESS_LOCAL_WRITE | + IB_ACCESS_REMOTE_READ | + IB_ACCESS_REMOTE_WRITE; + rsc->sig_mr->need_inval = true; + + sig_reg->sge.lkey = mr->lkey; + sig_reg->rkey = mr->rkey; + sig_reg->sge.addr = mr->iova; + sig_reg->sge.length = mr->length; + + iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=%u\n", + sig_reg->sge.lkey, sig_reg->rkey, sig_reg->sge.addr, + sig_reg->sge.length); +err: + return ret; +} + +static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task, + struct iser_data_buf *mem, + struct iser_reg_resources *rsc, + struct iser_mem_reg *reg) +{ + struct iser_tx_desc *tx_desc = &iser_task->desc; + struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe; + struct ib_mr *mr = rsc->mr; + struct ib_reg_wr *wr = &tx_desc->reg_wr; + int n; + + if (rsc->mr->need_inval) + iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr); + + ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey)); + + n = ib_map_mr_sg(mr, mem->sg, mem->dma_nents, NULL, SZ_4K); + if (unlikely(n != mem->dma_nents)) { + iser_err("failed to map sg (%d/%d)\n", + n, mem->dma_nents); + return n < 0 ? n : -EINVAL; + } + + wr->wr.next = &tx_desc->send_wr; + wr->wr.opcode = IB_WR_REG_MR; + wr->wr.wr_cqe = cqe; + wr->wr.send_flags = 0; + wr->wr.num_sge = 0; + wr->mr = mr; + wr->key = mr->rkey; + wr->access = IB_ACCESS_LOCAL_WRITE | + IB_ACCESS_REMOTE_WRITE | + IB_ACCESS_REMOTE_READ; + + rsc->mr->need_inval = true; + + reg->sge.lkey = mr->lkey; + reg->rkey = mr->rkey; + reg->sge.addr = mr->iova; + reg->sge.length = mr->length; + + iser_dbg("lkey=0x%x rkey=0x%x addr=0x%llx length=0x%x\n", + reg->sge.lkey, reg->rkey, reg->sge.addr, reg->sge.length); + + return 0; +} + +static int +iser_reg_data_sg(struct iscsi_iser_task *task, + struct iser_data_buf *mem, + struct iser_fr_desc *desc, + bool use_dma_key, + struct iser_mem_reg *reg) +{ + struct iser_device *device = task->iser_conn->ib_conn.device; + + if (use_dma_key) + return iser_reg_dma(device, mem, reg); + + return iser_fast_reg_mr(task, mem, &desc->rsc, reg); +} + +int iser_reg_mem_fastreg(struct iscsi_iser_task *task, + enum iser_data_dir dir, + bool all_imm) +{ + struct ib_conn *ib_conn = &task->iser_conn->ib_conn; + struct iser_data_buf *mem = &task->data[dir]; + struct iser_mem_reg *reg = &task->rdma_reg[dir]; + struct iser_fr_desc *desc = NULL; + bool use_dma_key; + int err; + + use_dma_key = mem->dma_nents == 1 && (all_imm || !iser_always_reg) && + scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL; + + if (!use_dma_key) { + desc = iser_reg_desc_get_fr(ib_conn); + reg->mem_h = desc; + } + + if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL) { + err = iser_reg_data_sg(task, mem, desc, use_dma_key, reg); + if (unlikely(err)) + goto err_reg; + } else { + err = iser_reg_sig_mr(task, mem, &task->prot[dir], + &desc->rsc, reg); + if (unlikely(err)) + goto err_reg; + + desc->sig_protected = true; + } + + return 0; + +err_reg: + if (desc) + iser_reg_desc_put_fr(ib_conn, desc); + + return err; +} + |