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790 lines
22 KiB
790 lines
22 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/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/mm.h> |
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#include <linux/scatterlist.h> |
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#include <linux/kfifo.h> |
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_host.h> |
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|
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#include "iscsi_iser.h" |
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|
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/* Register user buffer memory and initialize passive rdma |
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* dto descriptor. Data size is stored in |
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* task->data[ISER_DIR_IN].data_len, Protection size |
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* os stored in task->prot[ISER_DIR_IN].data_len |
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*/ |
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static int iser_prepare_read_cmd(struct iscsi_task *task) |
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|
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{ |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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struct iser_mem_reg *mem_reg; |
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int err; |
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struct iser_ctrl *hdr = &iser_task->desc.iser_header; |
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struct iser_data_buf *buf_in = &iser_task->data[ISER_DIR_IN]; |
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|
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err = iser_dma_map_task_data(iser_task, |
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buf_in, |
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ISER_DIR_IN, |
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DMA_FROM_DEVICE); |
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if (err) |
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return err; |
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|
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if (scsi_prot_sg_count(iser_task->sc)) { |
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struct iser_data_buf *pbuf_in = &iser_task->prot[ISER_DIR_IN]; |
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|
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err = iser_dma_map_task_data(iser_task, |
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pbuf_in, |
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ISER_DIR_IN, |
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DMA_FROM_DEVICE); |
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if (err) |
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return err; |
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} |
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|
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err = iser_reg_mem_fastreg(iser_task, ISER_DIR_IN, false); |
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if (err) { |
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iser_err("Failed to set up Data-IN RDMA\n"); |
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return err; |
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} |
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mem_reg = &iser_task->rdma_reg[ISER_DIR_IN]; |
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|
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hdr->flags |= ISER_RSV; |
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hdr->read_stag = cpu_to_be32(mem_reg->rkey); |
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hdr->read_va = cpu_to_be64(mem_reg->sge.addr); |
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iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n", |
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task->itt, mem_reg->rkey, |
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(unsigned long long)mem_reg->sge.addr); |
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|
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return 0; |
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} |
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|
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/* Register user buffer memory and initialize passive rdma |
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* dto descriptor. Data size is stored in |
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* task->data[ISER_DIR_OUT].data_len, Protection size |
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* is stored at task->prot[ISER_DIR_OUT].data_len |
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*/ |
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static int |
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iser_prepare_write_cmd(struct iscsi_task *task, |
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unsigned int imm_sz, |
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unsigned int unsol_sz, |
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unsigned int edtl) |
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{ |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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struct iser_mem_reg *mem_reg; |
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int err; |
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struct iser_ctrl *hdr = &iser_task->desc.iser_header; |
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struct iser_data_buf *buf_out = &iser_task->data[ISER_DIR_OUT]; |
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struct ib_sge *tx_dsg = &iser_task->desc.tx_sg[1]; |
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err = iser_dma_map_task_data(iser_task, |
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buf_out, |
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ISER_DIR_OUT, |
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DMA_TO_DEVICE); |
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if (err) |
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return err; |
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|
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if (scsi_prot_sg_count(iser_task->sc)) { |
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struct iser_data_buf *pbuf_out = &iser_task->prot[ISER_DIR_OUT]; |
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err = iser_dma_map_task_data(iser_task, |
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pbuf_out, |
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ISER_DIR_OUT, |
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DMA_TO_DEVICE); |
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if (err) |
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return err; |
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} |
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err = iser_reg_mem_fastreg(iser_task, ISER_DIR_OUT, |
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buf_out->data_len == imm_sz); |
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if (err != 0) { |
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iser_err("Failed to register write cmd RDMA mem\n"); |
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return err; |
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} |
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mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; |
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if (unsol_sz < edtl) { |
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hdr->flags |= ISER_WSV; |
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if (buf_out->data_len > imm_sz) { |
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hdr->write_stag = cpu_to_be32(mem_reg->rkey); |
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hdr->write_va = cpu_to_be64(mem_reg->sge.addr + unsol_sz); |
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} |
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iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X VA:%#llX + unsol:%d\n", |
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task->itt, mem_reg->rkey, |
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(unsigned long long)mem_reg->sge.addr, unsol_sz); |
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} |
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if (imm_sz > 0) { |
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iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n", |
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task->itt, imm_sz); |
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tx_dsg->addr = mem_reg->sge.addr; |
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tx_dsg->length = imm_sz; |
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tx_dsg->lkey = mem_reg->sge.lkey; |
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iser_task->desc.num_sge = 2; |
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} |
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return 0; |
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} |
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|
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/* creates a new tx descriptor and adds header regd buffer */ |
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static void iser_create_send_desc(struct iser_conn *iser_conn, |
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struct iser_tx_desc *tx_desc) |
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{ |
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struct iser_device *device = iser_conn->ib_conn.device; |
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ib_dma_sync_single_for_cpu(device->ib_device, |
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tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE); |
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memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl)); |
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tx_desc->iser_header.flags = ISER_VER; |
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tx_desc->num_sge = 1; |
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} |
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static void iser_free_login_buf(struct iser_conn *iser_conn) |
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{ |
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struct iser_device *device = iser_conn->ib_conn.device; |
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struct iser_login_desc *desc = &iser_conn->login_desc; |
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|
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if (!desc->req) |
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return; |
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ib_dma_unmap_single(device->ib_device, desc->req_dma, |
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ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_TO_DEVICE); |
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ib_dma_unmap_single(device->ib_device, desc->rsp_dma, |
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ISER_RX_LOGIN_SIZE, DMA_FROM_DEVICE); |
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kfree(desc->req); |
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kfree(desc->rsp); |
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|
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/* make sure we never redo any unmapping */ |
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desc->req = NULL; |
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desc->rsp = NULL; |
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} |
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static int iser_alloc_login_buf(struct iser_conn *iser_conn) |
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{ |
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struct iser_device *device = iser_conn->ib_conn.device; |
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struct iser_login_desc *desc = &iser_conn->login_desc; |
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desc->req = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
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if (!desc->req) |
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return -ENOMEM; |
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desc->req_dma = ib_dma_map_single(device->ib_device, desc->req, |
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ISCSI_DEF_MAX_RECV_SEG_LEN, |
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DMA_TO_DEVICE); |
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if (ib_dma_mapping_error(device->ib_device, |
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desc->req_dma)) |
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goto free_req; |
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desc->rsp = kmalloc(ISER_RX_LOGIN_SIZE, GFP_KERNEL); |
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if (!desc->rsp) |
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goto unmap_req; |
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desc->rsp_dma = ib_dma_map_single(device->ib_device, desc->rsp, |
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ISER_RX_LOGIN_SIZE, |
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DMA_FROM_DEVICE); |
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if (ib_dma_mapping_error(device->ib_device, |
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desc->rsp_dma)) |
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goto free_rsp; |
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return 0; |
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free_rsp: |
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kfree(desc->rsp); |
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unmap_req: |
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ib_dma_unmap_single(device->ib_device, desc->req_dma, |
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ISCSI_DEF_MAX_RECV_SEG_LEN, |
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DMA_TO_DEVICE); |
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free_req: |
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kfree(desc->req); |
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return -ENOMEM; |
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} |
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int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
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struct iscsi_session *session) |
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{ |
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int i, j; |
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u64 dma_addr; |
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struct iser_rx_desc *rx_desc; |
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struct ib_sge *rx_sg; |
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struct ib_conn *ib_conn = &iser_conn->ib_conn; |
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struct iser_device *device = ib_conn->device; |
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iser_conn->qp_max_recv_dtos = session->cmds_max; |
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iser_conn->qp_max_recv_dtos_mask = session->cmds_max - 1; /* cmds_max is 2^N */ |
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iser_conn->min_posted_rx = iser_conn->qp_max_recv_dtos >> 2; |
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if (iser_alloc_fastreg_pool(ib_conn, session->scsi_cmds_max, |
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iser_conn->pages_per_mr)) |
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goto create_rdma_reg_res_failed; |
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if (iser_alloc_login_buf(iser_conn)) |
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goto alloc_login_buf_fail; |
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iser_conn->num_rx_descs = session->cmds_max; |
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iser_conn->rx_descs = kmalloc_array(iser_conn->num_rx_descs, |
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sizeof(struct iser_rx_desc), |
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GFP_KERNEL); |
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if (!iser_conn->rx_descs) |
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goto rx_desc_alloc_fail; |
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rx_desc = iser_conn->rx_descs; |
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for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) { |
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dma_addr = ib_dma_map_single(device->ib_device, (void *)rx_desc, |
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
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if (ib_dma_mapping_error(device->ib_device, dma_addr)) |
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goto rx_desc_dma_map_failed; |
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rx_desc->dma_addr = dma_addr; |
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rx_desc->cqe.done = iser_task_rsp; |
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rx_sg = &rx_desc->rx_sg; |
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rx_sg->addr = rx_desc->dma_addr; |
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rx_sg->length = ISER_RX_PAYLOAD_SIZE; |
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rx_sg->lkey = device->pd->local_dma_lkey; |
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} |
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iser_conn->rx_desc_head = 0; |
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return 0; |
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rx_desc_dma_map_failed: |
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rx_desc = iser_conn->rx_descs; |
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for (j = 0; j < i; j++, rx_desc++) |
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, |
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
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kfree(iser_conn->rx_descs); |
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iser_conn->rx_descs = NULL; |
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rx_desc_alloc_fail: |
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iser_free_login_buf(iser_conn); |
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alloc_login_buf_fail: |
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iser_free_fastreg_pool(ib_conn); |
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create_rdma_reg_res_failed: |
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iser_err("failed allocating rx descriptors / data buffers\n"); |
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return -ENOMEM; |
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} |
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void iser_free_rx_descriptors(struct iser_conn *iser_conn) |
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{ |
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int i; |
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struct iser_rx_desc *rx_desc; |
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struct ib_conn *ib_conn = &iser_conn->ib_conn; |
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struct iser_device *device = ib_conn->device; |
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iser_free_fastreg_pool(ib_conn); |
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rx_desc = iser_conn->rx_descs; |
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for (i = 0; i < iser_conn->qp_max_recv_dtos; i++, rx_desc++) |
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ib_dma_unmap_single(device->ib_device, rx_desc->dma_addr, |
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ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE); |
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kfree(iser_conn->rx_descs); |
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/* make sure we never redo any unmapping */ |
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iser_conn->rx_descs = NULL; |
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|
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iser_free_login_buf(iser_conn); |
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} |
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static int iser_post_rx_bufs(struct iscsi_conn *conn, struct iscsi_hdr *req) |
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{ |
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struct iser_conn *iser_conn = conn->dd_data; |
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struct ib_conn *ib_conn = &iser_conn->ib_conn; |
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struct iscsi_session *session = conn->session; |
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|
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iser_dbg("req op %x flags %x\n", req->opcode, req->flags); |
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/* check if this is the last login - going to full feature phase */ |
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if ((req->flags & ISCSI_FULL_FEATURE_PHASE) != ISCSI_FULL_FEATURE_PHASE) |
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return 0; |
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/* |
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* Check that there is one posted recv buffer |
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* (for the last login response). |
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*/ |
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WARN_ON(ib_conn->post_recv_buf_count != 1); |
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|
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if (session->discovery_sess) { |
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iser_info("Discovery session, re-using login RX buffer\n"); |
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return 0; |
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} else |
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iser_info("Normal session, posting batch of RX %d buffers\n", |
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iser_conn->min_posted_rx); |
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|
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/* Initial post receive buffers */ |
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if (iser_post_recvm(iser_conn, iser_conn->min_posted_rx)) |
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return -ENOMEM; |
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|
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return 0; |
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} |
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|
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static inline bool iser_signal_comp(u8 sig_count) |
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{ |
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return ((sig_count % ISER_SIGNAL_CMD_COUNT) == 0); |
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} |
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|
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/** |
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* iser_send_command - send command PDU |
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* @conn: link to matching iscsi connection |
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* @task: SCSI command task |
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*/ |
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int iser_send_command(struct iscsi_conn *conn, |
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struct iscsi_task *task) |
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{ |
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struct iser_conn *iser_conn = conn->dd_data; |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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unsigned long edtl; |
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int err; |
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struct iser_data_buf *data_buf, *prot_buf; |
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struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)task->hdr; |
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struct scsi_cmnd *sc = task->sc; |
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struct iser_tx_desc *tx_desc = &iser_task->desc; |
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u8 sig_count = ++iser_conn->ib_conn.sig_count; |
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|
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edtl = ntohl(hdr->data_length); |
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|
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/* build the tx desc regd header and add it to the tx desc dto */ |
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tx_desc->type = ISCSI_TX_SCSI_COMMAND; |
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tx_desc->cqe.done = iser_cmd_comp; |
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iser_create_send_desc(iser_conn, tx_desc); |
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|
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if (hdr->flags & ISCSI_FLAG_CMD_READ) { |
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data_buf = &iser_task->data[ISER_DIR_IN]; |
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prot_buf = &iser_task->prot[ISER_DIR_IN]; |
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} else { |
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data_buf = &iser_task->data[ISER_DIR_OUT]; |
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prot_buf = &iser_task->prot[ISER_DIR_OUT]; |
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} |
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|
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if (scsi_sg_count(sc)) { /* using a scatter list */ |
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data_buf->sg = scsi_sglist(sc); |
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data_buf->size = scsi_sg_count(sc); |
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} |
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data_buf->data_len = scsi_bufflen(sc); |
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|
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if (scsi_prot_sg_count(sc)) { |
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prot_buf->sg = scsi_prot_sglist(sc); |
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prot_buf->size = scsi_prot_sg_count(sc); |
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prot_buf->data_len = (data_buf->data_len >> |
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ilog2(sc->device->sector_size)) * 8; |
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} |
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|
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if (hdr->flags & ISCSI_FLAG_CMD_READ) { |
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err = iser_prepare_read_cmd(task); |
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if (err) |
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goto send_command_error; |
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} |
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if (hdr->flags & ISCSI_FLAG_CMD_WRITE) { |
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err = iser_prepare_write_cmd(task, |
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task->imm_count, |
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task->imm_count + |
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task->unsol_r2t.data_length, |
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edtl); |
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if (err) |
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goto send_command_error; |
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} |
|
|
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iser_task->status = ISER_TASK_STATUS_STARTED; |
|
|
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err = iser_post_send(&iser_conn->ib_conn, tx_desc, |
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iser_signal_comp(sig_count)); |
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if (!err) |
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return 0; |
|
|
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send_command_error: |
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iser_err("conn %p failed task->itt %d err %d\n",conn, task->itt, err); |
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return err; |
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} |
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|
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/** |
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* iser_send_data_out - send data out PDU |
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* @conn: link to matching iscsi connection |
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* @task: SCSI command task |
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* @hdr: pointer to the LLD's iSCSI message header |
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*/ |
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int iser_send_data_out(struct iscsi_conn *conn, |
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struct iscsi_task *task, |
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struct iscsi_data *hdr) |
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{ |
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struct iser_conn *iser_conn = conn->dd_data; |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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struct iser_tx_desc *tx_desc; |
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struct iser_mem_reg *mem_reg; |
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unsigned long buf_offset; |
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unsigned long data_seg_len; |
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uint32_t itt; |
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int err; |
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struct ib_sge *tx_dsg; |
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|
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itt = (__force uint32_t)hdr->itt; |
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data_seg_len = ntoh24(hdr->dlength); |
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buf_offset = ntohl(hdr->offset); |
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|
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iser_dbg("%s itt %d dseg_len %d offset %d\n", |
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__func__,(int)itt,(int)data_seg_len,(int)buf_offset); |
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|
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tx_desc = kmem_cache_zalloc(ig.desc_cache, GFP_ATOMIC); |
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if (!tx_desc) |
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return -ENOMEM; |
|
|
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tx_desc->type = ISCSI_TX_DATAOUT; |
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tx_desc->cqe.done = iser_dataout_comp; |
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tx_desc->iser_header.flags = ISER_VER; |
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memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr)); |
|
|
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/* build the tx desc */ |
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err = iser_initialize_task_headers(task, tx_desc); |
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if (err) |
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goto send_data_out_error; |
|
|
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mem_reg = &iser_task->rdma_reg[ISER_DIR_OUT]; |
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tx_dsg = &tx_desc->tx_sg[1]; |
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tx_dsg->addr = mem_reg->sge.addr + buf_offset; |
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tx_dsg->length = data_seg_len; |
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tx_dsg->lkey = mem_reg->sge.lkey; |
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tx_desc->num_sge = 2; |
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|
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if (buf_offset + data_seg_len > iser_task->data[ISER_DIR_OUT].data_len) { |
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iser_err("Offset:%ld & DSL:%ld in Data-Out inconsistent with total len:%ld, itt:%d\n", |
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buf_offset, data_seg_len, |
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iser_task->data[ISER_DIR_OUT].data_len, itt); |
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err = -EINVAL; |
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goto send_data_out_error; |
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} |
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iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n", |
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itt, buf_offset, data_seg_len); |
|
|
|
|
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err = iser_post_send(&iser_conn->ib_conn, tx_desc, true); |
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if (!err) |
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return 0; |
|
|
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send_data_out_error: |
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kmem_cache_free(ig.desc_cache, tx_desc); |
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iser_err("conn %p failed err %d\n", conn, err); |
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return err; |
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} |
|
|
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int iser_send_control(struct iscsi_conn *conn, |
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struct iscsi_task *task) |
|
{ |
|
struct iser_conn *iser_conn = conn->dd_data; |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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struct iser_tx_desc *mdesc = &iser_task->desc; |
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unsigned long data_seg_len; |
|
int err = 0; |
|
struct iser_device *device; |
|
|
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/* build the tx desc regd header and add it to the tx desc dto */ |
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mdesc->type = ISCSI_TX_CONTROL; |
|
mdesc->cqe.done = iser_ctrl_comp; |
|
iser_create_send_desc(iser_conn, mdesc); |
|
|
|
device = iser_conn->ib_conn.device; |
|
|
|
data_seg_len = ntoh24(task->hdr->dlength); |
|
|
|
if (data_seg_len > 0) { |
|
struct iser_login_desc *desc = &iser_conn->login_desc; |
|
struct ib_sge *tx_dsg = &mdesc->tx_sg[1]; |
|
|
|
if (task != conn->login_task) { |
|
iser_err("data present on non login task!!!\n"); |
|
goto send_control_error; |
|
} |
|
|
|
ib_dma_sync_single_for_cpu(device->ib_device, desc->req_dma, |
|
task->data_count, DMA_TO_DEVICE); |
|
|
|
memcpy(desc->req, task->data, task->data_count); |
|
|
|
ib_dma_sync_single_for_device(device->ib_device, desc->req_dma, |
|
task->data_count, DMA_TO_DEVICE); |
|
|
|
tx_dsg->addr = desc->req_dma; |
|
tx_dsg->length = task->data_count; |
|
tx_dsg->lkey = device->pd->local_dma_lkey; |
|
mdesc->num_sge = 2; |
|
} |
|
|
|
if (task == conn->login_task) { |
|
iser_dbg("op %x dsl %lx, posting login rx buffer\n", |
|
task->hdr->opcode, data_seg_len); |
|
err = iser_post_recvl(iser_conn); |
|
if (err) |
|
goto send_control_error; |
|
err = iser_post_rx_bufs(conn, task->hdr); |
|
if (err) |
|
goto send_control_error; |
|
} |
|
|
|
err = iser_post_send(&iser_conn->ib_conn, mdesc, true); |
|
if (!err) |
|
return 0; |
|
|
|
send_control_error: |
|
iser_err("conn %p failed err %d\n",conn, err); |
|
return err; |
|
} |
|
|
|
void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct ib_conn *ib_conn = wc->qp->qp_context; |
|
struct iser_conn *iser_conn = to_iser_conn(ib_conn); |
|
struct iser_login_desc *desc = iser_login(wc->wr_cqe); |
|
struct iscsi_hdr *hdr; |
|
char *data; |
|
int length; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
iser_err_comp(wc, "login_rsp"); |
|
return; |
|
} |
|
|
|
ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, |
|
desc->rsp_dma, ISER_RX_LOGIN_SIZE, |
|
DMA_FROM_DEVICE); |
|
|
|
hdr = desc->rsp + sizeof(struct iser_ctrl); |
|
data = desc->rsp + ISER_HEADERS_LEN; |
|
length = wc->byte_len - ISER_HEADERS_LEN; |
|
|
|
iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, |
|
hdr->itt, length); |
|
|
|
iscsi_iser_recv(iser_conn->iscsi_conn, hdr, data, length); |
|
|
|
ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
|
desc->rsp_dma, ISER_RX_LOGIN_SIZE, |
|
DMA_FROM_DEVICE); |
|
|
|
ib_conn->post_recv_buf_count--; |
|
} |
|
|
|
static inline int |
|
iser_inv_desc(struct iser_fr_desc *desc, u32 rkey) |
|
{ |
|
if (unlikely((!desc->sig_protected && rkey != desc->rsc.mr->rkey) || |
|
(desc->sig_protected && rkey != desc->rsc.sig_mr->rkey))) { |
|
iser_err("Bogus remote invalidation for rkey %#x\n", rkey); |
|
return -EINVAL; |
|
} |
|
|
|
desc->rsc.mr_valid = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
iser_check_remote_inv(struct iser_conn *iser_conn, |
|
struct ib_wc *wc, |
|
struct iscsi_hdr *hdr) |
|
{ |
|
if (wc->wc_flags & IB_WC_WITH_INVALIDATE) { |
|
struct iscsi_task *task; |
|
u32 rkey = wc->ex.invalidate_rkey; |
|
|
|
iser_dbg("conn %p: remote invalidation for rkey %#x\n", |
|
iser_conn, rkey); |
|
|
|
if (unlikely(!iser_conn->snd_w_inv)) { |
|
iser_err("conn %p: unexpected remote invalidation, terminating connection\n", |
|
iser_conn); |
|
return -EPROTO; |
|
} |
|
|
|
task = iscsi_itt_to_ctask(iser_conn->iscsi_conn, hdr->itt); |
|
if (likely(task)) { |
|
struct iscsi_iser_task *iser_task = task->dd_data; |
|
struct iser_fr_desc *desc; |
|
|
|
if (iser_task->dir[ISER_DIR_IN]) { |
|
desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h; |
|
if (unlikely(iser_inv_desc(desc, rkey))) |
|
return -EINVAL; |
|
} |
|
|
|
if (iser_task->dir[ISER_DIR_OUT]) { |
|
desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h; |
|
if (unlikely(iser_inv_desc(desc, rkey))) |
|
return -EINVAL; |
|
} |
|
} else { |
|
iser_err("failed to get task for itt=%d\n", hdr->itt); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
|
|
void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct ib_conn *ib_conn = wc->qp->qp_context; |
|
struct iser_conn *iser_conn = to_iser_conn(ib_conn); |
|
struct iser_rx_desc *desc = iser_rx(wc->wr_cqe); |
|
struct iscsi_hdr *hdr; |
|
int length; |
|
int outstanding, count, err; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
iser_err_comp(wc, "task_rsp"); |
|
return; |
|
} |
|
|
|
ib_dma_sync_single_for_cpu(ib_conn->device->ib_device, |
|
desc->dma_addr, ISER_RX_PAYLOAD_SIZE, |
|
DMA_FROM_DEVICE); |
|
|
|
hdr = &desc->iscsi_header; |
|
length = wc->byte_len - ISER_HEADERS_LEN; |
|
|
|
iser_dbg("op 0x%x itt 0x%x dlen %d\n", hdr->opcode, |
|
hdr->itt, length); |
|
|
|
if (iser_check_remote_inv(iser_conn, wc, hdr)) { |
|
iscsi_conn_failure(iser_conn->iscsi_conn, |
|
ISCSI_ERR_CONN_FAILED); |
|
return; |
|
} |
|
|
|
iscsi_iser_recv(iser_conn->iscsi_conn, hdr, desc->data, length); |
|
|
|
ib_dma_sync_single_for_device(ib_conn->device->ib_device, |
|
desc->dma_addr, ISER_RX_PAYLOAD_SIZE, |
|
DMA_FROM_DEVICE); |
|
|
|
/* decrementing conn->post_recv_buf_count only --after-- freeing the * |
|
* task eliminates the need to worry on tasks which are completed in * |
|
* parallel to the execution of iser_conn_term. So the code that waits * |
|
* for the posted rx bufs refcount to become zero handles everything */ |
|
ib_conn->post_recv_buf_count--; |
|
|
|
outstanding = ib_conn->post_recv_buf_count; |
|
if (outstanding + iser_conn->min_posted_rx <= iser_conn->qp_max_recv_dtos) { |
|
count = min(iser_conn->qp_max_recv_dtos - outstanding, |
|
iser_conn->min_posted_rx); |
|
err = iser_post_recvm(iser_conn, count); |
|
if (err) |
|
iser_err("posting %d rx bufs err %d\n", count, err); |
|
} |
|
} |
|
|
|
void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
if (unlikely(wc->status != IB_WC_SUCCESS)) |
|
iser_err_comp(wc, "command"); |
|
} |
|
|
|
void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); |
|
struct iscsi_task *task; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) { |
|
iser_err_comp(wc, "control"); |
|
return; |
|
} |
|
|
|
/* this arithmetic is legal by libiscsi dd_data allocation */ |
|
task = (void *)desc - sizeof(struct iscsi_task); |
|
if (task->hdr->itt == RESERVED_ITT) |
|
iscsi_put_task(task); |
|
} |
|
|
|
void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc) |
|
{ |
|
struct iser_tx_desc *desc = iser_tx(wc->wr_cqe); |
|
struct ib_conn *ib_conn = wc->qp->qp_context; |
|
struct iser_device *device = ib_conn->device; |
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) |
|
iser_err_comp(wc, "dataout"); |
|
|
|
ib_dma_unmap_single(device->ib_device, desc->dma_addr, |
|
ISER_HEADERS_LEN, DMA_TO_DEVICE); |
|
kmem_cache_free(ig.desc_cache, desc); |
|
} |
|
|
|
void iser_task_rdma_init(struct iscsi_iser_task *iser_task) |
|
|
|
{ |
|
iser_task->status = ISER_TASK_STATUS_INIT; |
|
|
|
iser_task->dir[ISER_DIR_IN] = 0; |
|
iser_task->dir[ISER_DIR_OUT] = 0; |
|
|
|
iser_task->data[ISER_DIR_IN].data_len = 0; |
|
iser_task->data[ISER_DIR_OUT].data_len = 0; |
|
|
|
iser_task->prot[ISER_DIR_IN].data_len = 0; |
|
iser_task->prot[ISER_DIR_OUT].data_len = 0; |
|
|
|
iser_task->prot[ISER_DIR_IN].dma_nents = 0; |
|
iser_task->prot[ISER_DIR_OUT].dma_nents = 0; |
|
|
|
memset(&iser_task->rdma_reg[ISER_DIR_IN], 0, |
|
sizeof(struct iser_mem_reg)); |
|
memset(&iser_task->rdma_reg[ISER_DIR_OUT], 0, |
|
sizeof(struct iser_mem_reg)); |
|
} |
|
|
|
void iser_task_rdma_finalize(struct iscsi_iser_task *iser_task) |
|
{ |
|
int prot_count = scsi_prot_sg_count(iser_task->sc); |
|
|
|
if (iser_task->dir[ISER_DIR_IN]) { |
|
iser_unreg_mem_fastreg(iser_task, ISER_DIR_IN); |
|
iser_dma_unmap_task_data(iser_task, |
|
&iser_task->data[ISER_DIR_IN], |
|
DMA_FROM_DEVICE); |
|
if (prot_count) |
|
iser_dma_unmap_task_data(iser_task, |
|
&iser_task->prot[ISER_DIR_IN], |
|
DMA_FROM_DEVICE); |
|
} |
|
|
|
if (iser_task->dir[ISER_DIR_OUT]) { |
|
iser_unreg_mem_fastreg(iser_task, ISER_DIR_OUT); |
|
iser_dma_unmap_task_data(iser_task, |
|
&iser_task->data[ISER_DIR_OUT], |
|
DMA_TO_DEVICE); |
|
if (prot_count) |
|
iser_dma_unmap_task_data(iser_task, |
|
&iser_task->prot[ISER_DIR_OUT], |
|
DMA_TO_DEVICE); |
|
} |
|
}
|
|
|