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