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1104 lines
31 KiB
1104 lines
31 KiB
/* |
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* iSCSI Initiator over iSER Data-Path |
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* |
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* Copyright (C) 2004 Dmitry Yusupov |
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* Copyright (C) 2004 Alex Aizman |
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* Copyright (C) 2005 Mike Christie |
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* Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved. |
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* Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
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* maintained by [email protected] |
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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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* Credits: |
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* Christoph Hellwig |
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* FUJITA Tomonori |
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* Arne Redlich |
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* Zhenyu Wang |
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* Modified by: |
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* Erez Zilber |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/list.h> |
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#include <linux/hardirq.h> |
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#include <linux/kfifo.h> |
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#include <linux/blkdev.h> |
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#include <linux/init.h> |
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#include <linux/ioctl.h> |
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#include <linux/cdev.h> |
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#include <linux/in.h> |
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#include <linux/net.h> |
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#include <linux/scatterlist.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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|
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#include <net/sock.h> |
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|
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#include <linux/uaccess.h> |
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|
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#include <scsi/scsi_cmnd.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_eh.h> |
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#include <scsi/scsi_tcq.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_transport_iscsi.h> |
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|
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#include "iscsi_iser.h" |
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|
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MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover"); |
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MODULE_LICENSE("Dual BSD/GPL"); |
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MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz"); |
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|
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static struct scsi_host_template iscsi_iser_sht; |
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static struct iscsi_transport iscsi_iser_transport; |
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static struct scsi_transport_template *iscsi_iser_scsi_transport; |
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static struct workqueue_struct *release_wq; |
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static DEFINE_MUTEX(unbind_iser_conn_mutex); |
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struct iser_global ig; |
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|
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int iser_debug_level = 0; |
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module_param_named(debug_level, iser_debug_level, int, S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)"); |
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|
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static int iscsi_iser_set(const char *val, const struct kernel_param *kp); |
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static const struct kernel_param_ops iscsi_iser_size_ops = { |
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.set = iscsi_iser_set, |
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.get = param_get_uint, |
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}; |
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|
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static unsigned int iscsi_max_lun = 512; |
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module_param_cb(max_lun, &iscsi_iser_size_ops, &iscsi_max_lun, S_IRUGO); |
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MODULE_PARM_DESC(max_lun, "Max LUNs to allow per session, should > 0 (default:512)"); |
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|
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unsigned int iser_max_sectors = ISER_DEF_MAX_SECTORS; |
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module_param_cb(max_sectors, &iscsi_iser_size_ops, &iser_max_sectors, |
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S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(max_sectors, "Max number of sectors in a single scsi command, should > 0 (default:1024)"); |
|
|
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bool iser_always_reg = true; |
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module_param_named(always_register, iser_always_reg, bool, S_IRUGO); |
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MODULE_PARM_DESC(always_register, |
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"Always register memory, even for continuous memory regions (default:true)"); |
|
|
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bool iser_pi_enable = false; |
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module_param_named(pi_enable, iser_pi_enable, bool, S_IRUGO); |
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MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)"); |
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|
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int iser_pi_guard; |
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module_param_named(pi_guard, iser_pi_guard, int, S_IRUGO); |
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MODULE_PARM_DESC(pi_guard, "T10-PI guard_type [deprecated]"); |
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|
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static int iscsi_iser_set(const char *val, const struct kernel_param *kp) |
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{ |
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int ret; |
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unsigned int n = 0; |
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|
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ret = kstrtouint(val, 10, &n); |
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if (ret != 0 || n == 0) |
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return -EINVAL; |
|
|
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return param_set_uint(val, kp); |
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} |
|
|
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/* |
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* iscsi_iser_recv() - Process a successful recv completion |
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* @conn: iscsi connection |
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* @hdr: iscsi header |
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* @rx_data: buffer containing receive data payload |
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* @rx_data_len: length of rx_data |
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* |
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* Notes: In case of data length errors or iscsi PDU completion failures |
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* this routine will signal iscsi layer of connection failure. |
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*/ |
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void |
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iscsi_iser_recv(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
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char *rx_data, int rx_data_len) |
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{ |
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int rc = 0; |
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int datalen; |
|
|
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/* verify PDU length */ |
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datalen = ntoh24(hdr->dlength); |
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if (datalen > rx_data_len || (datalen + 4) < rx_data_len) { |
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iser_err("wrong datalen %d (hdr), %d (IB)\n", |
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datalen, rx_data_len); |
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rc = ISCSI_ERR_DATALEN; |
|
goto error; |
|
} |
|
|
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if (datalen != rx_data_len) |
|
iser_dbg("aligned datalen (%d) hdr, %d (IB)\n", |
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datalen, rx_data_len); |
|
|
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rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len); |
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if (rc && rc != ISCSI_ERR_NO_SCSI_CMD) |
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goto error; |
|
|
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return; |
|
error: |
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iscsi_conn_failure(conn, rc); |
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} |
|
|
|
/** |
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* iscsi_iser_pdu_alloc() - allocate an iscsi-iser PDU |
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* @task: iscsi task |
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* @opcode: iscsi command opcode |
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* |
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* Netes: This routine can't fail, just assign iscsi task |
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* hdr and max hdr size. |
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*/ |
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static int |
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iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode) |
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{ |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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|
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task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header; |
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task->hdr_max = sizeof(iser_task->desc.iscsi_header); |
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|
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return 0; |
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} |
|
|
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/** |
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* iser_initialize_task_headers() - Initialize task headers |
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* @task: iscsi task |
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* @tx_desc: iser tx descriptor |
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* |
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* Notes: |
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* This routine may race with iser teardown flow for scsi |
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* error handling TMFs. So for TMF we should acquire the |
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* state mutex to avoid dereferencing the IB device which |
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* may have already been terminated. |
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*/ |
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int |
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iser_initialize_task_headers(struct iscsi_task *task, |
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struct iser_tx_desc *tx_desc) |
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{ |
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struct iser_conn *iser_conn = task->conn->dd_data; |
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struct iser_device *device = iser_conn->ib_conn.device; |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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u64 dma_addr; |
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|
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if (unlikely(iser_conn->state != ISER_CONN_UP)) |
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return -ENODEV; |
|
|
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dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc, |
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ISER_HEADERS_LEN, DMA_TO_DEVICE); |
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if (ib_dma_mapping_error(device->ib_device, dma_addr)) |
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return -ENOMEM; |
|
|
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tx_desc->inv_wr.next = NULL; |
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tx_desc->reg_wr.wr.next = NULL; |
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tx_desc->mapped = true; |
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tx_desc->dma_addr = dma_addr; |
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tx_desc->tx_sg[0].addr = tx_desc->dma_addr; |
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tx_desc->tx_sg[0].length = ISER_HEADERS_LEN; |
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tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey; |
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|
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iser_task->iser_conn = iser_conn; |
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|
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return 0; |
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} |
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|
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/** |
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* iscsi_iser_task_init() - Initialize iscsi-iser task |
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* @task: iscsi task |
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* |
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* Initialize the task for the scsi command or mgmt command. |
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* |
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* Return: Returns zero on success or -ENOMEM when failing |
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* to init task headers (dma mapping error). |
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*/ |
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static int |
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iscsi_iser_task_init(struct iscsi_task *task) |
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{ |
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struct iscsi_iser_task *iser_task = task->dd_data; |
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int ret; |
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|
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ret = iser_initialize_task_headers(task, &iser_task->desc); |
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if (ret) { |
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iser_err("Failed to init task %p, err = %d\n", |
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iser_task, ret); |
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return ret; |
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} |
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|
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/* mgmt task */ |
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if (!task->sc) |
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return 0; |
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|
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iser_task->command_sent = 0; |
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iser_task_rdma_init(iser_task); |
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iser_task->sc = task->sc; |
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|
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return 0; |
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} |
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|
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/** |
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* iscsi_iser_mtask_xmit() - xmit management (immediate) task |
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* @conn: iscsi connection |
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* @task: task management task |
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* |
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* Notes: |
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* The function can return -EAGAIN in which case caller must |
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* call it again later, or recover. '0' return code means successful |
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* xmit. |
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* |
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**/ |
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static int |
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iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task) |
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{ |
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int error = 0; |
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|
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iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt); |
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|
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error = iser_send_control(conn, task); |
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|
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/* since iser xmits control with zero copy, tasks can not be recycled |
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* right after sending them. |
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* The recycling scheme is based on whether a response is expected |
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* - if yes, the task is recycled at iscsi_complete_pdu |
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* - if no, the task is recycled at iser_snd_completion |
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*/ |
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return error; |
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} |
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|
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static int |
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iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn, |
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struct iscsi_task *task) |
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{ |
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struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
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struct iscsi_data hdr; |
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int error = 0; |
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|
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/* Send data-out PDUs while there's still unsolicited data to send */ |
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while (iscsi_task_has_unsol_data(task)) { |
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iscsi_prep_data_out_pdu(task, r2t, &hdr); |
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iser_dbg("Sending data-out: itt 0x%x, data count %d\n", |
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hdr.itt, r2t->data_count); |
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|
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/* the buffer description has been passed with the command */ |
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/* Send the command */ |
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error = iser_send_data_out(conn, task, &hdr); |
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if (error) { |
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r2t->datasn--; |
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goto iscsi_iser_task_xmit_unsol_data_exit; |
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} |
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r2t->sent += r2t->data_count; |
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iser_dbg("Need to send %d more as data-out PDUs\n", |
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r2t->data_length - r2t->sent); |
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} |
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|
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iscsi_iser_task_xmit_unsol_data_exit: |
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return error; |
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} |
|
|
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/** |
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* iscsi_iser_task_xmit() - xmit iscsi-iser task |
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* @task: iscsi task |
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* |
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* Return: zero on success or escalates $error on failure. |
|
*/ |
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static int |
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iscsi_iser_task_xmit(struct iscsi_task *task) |
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{ |
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struct iscsi_conn *conn = task->conn; |
|
struct iscsi_iser_task *iser_task = task->dd_data; |
|
int error = 0; |
|
|
|
if (!task->sc) |
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return iscsi_iser_mtask_xmit(conn, task); |
|
|
|
if (task->sc->sc_data_direction == DMA_TO_DEVICE) { |
|
BUG_ON(scsi_bufflen(task->sc) == 0); |
|
|
|
iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n", |
|
task->itt, scsi_bufflen(task->sc), |
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task->imm_count, task->unsol_r2t.data_length); |
|
} |
|
|
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iser_dbg("ctask xmit [cid %d itt 0x%x]\n", |
|
conn->id, task->itt); |
|
|
|
/* Send the cmd PDU */ |
|
if (!iser_task->command_sent) { |
|
error = iser_send_command(conn, task); |
|
if (error) |
|
goto iscsi_iser_task_xmit_exit; |
|
iser_task->command_sent = 1; |
|
} |
|
|
|
/* Send unsolicited data-out PDU(s) if necessary */ |
|
if (iscsi_task_has_unsol_data(task)) |
|
error = iscsi_iser_task_xmit_unsol_data(conn, task); |
|
|
|
iscsi_iser_task_xmit_exit: |
|
return error; |
|
} |
|
|
|
/** |
|
* iscsi_iser_cleanup_task() - cleanup an iscsi-iser task |
|
* @task: iscsi task |
|
* |
|
* Notes: In case the RDMA device is already NULL (might have |
|
* been removed in DEVICE_REMOVAL CM event it will bail-out |
|
* without doing dma unmapping. |
|
*/ |
|
static void iscsi_iser_cleanup_task(struct iscsi_task *task) |
|
{ |
|
struct iscsi_iser_task *iser_task = task->dd_data; |
|
struct iser_tx_desc *tx_desc = &iser_task->desc; |
|
struct iser_conn *iser_conn = task->conn->dd_data; |
|
struct iser_device *device = iser_conn->ib_conn.device; |
|
|
|
/* DEVICE_REMOVAL event might have already released the device */ |
|
if (!device) |
|
return; |
|
|
|
if (likely(tx_desc->mapped)) { |
|
ib_dma_unmap_single(device->ib_device, tx_desc->dma_addr, |
|
ISER_HEADERS_LEN, DMA_TO_DEVICE); |
|
tx_desc->mapped = false; |
|
} |
|
|
|
/* mgmt tasks do not need special cleanup */ |
|
if (!task->sc) |
|
return; |
|
|
|
if (iser_task->status == ISER_TASK_STATUS_STARTED) { |
|
iser_task->status = ISER_TASK_STATUS_COMPLETED; |
|
iser_task_rdma_finalize(iser_task); |
|
} |
|
} |
|
|
|
/** |
|
* iscsi_iser_check_protection() - check protection information status of task. |
|
* @task: iscsi task |
|
* @sector: error sector if exsists (output) |
|
* |
|
* Return: zero if no data-integrity errors have occured |
|
* 0x1: data-integrity error occured in the guard-block |
|
* 0x2: data-integrity error occured in the reference tag |
|
* 0x3: data-integrity error occured in the application tag |
|
* |
|
* In addition the error sector is marked. |
|
*/ |
|
static u8 |
|
iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector) |
|
{ |
|
struct iscsi_iser_task *iser_task = task->dd_data; |
|
enum iser_data_dir dir = iser_task->dir[ISER_DIR_IN] ? |
|
ISER_DIR_IN : ISER_DIR_OUT; |
|
|
|
return iser_check_task_pi_status(iser_task, dir, sector); |
|
} |
|
|
|
/** |
|
* iscsi_iser_conn_create() - create a new iscsi-iser connection |
|
* @cls_session: iscsi class connection |
|
* @conn_idx: connection index within the session (for MCS) |
|
* |
|
* Return: iscsi_cls_conn when iscsi_conn_setup succeeds or NULL |
|
* otherwise. |
|
*/ |
|
static struct iscsi_cls_conn * |
|
iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, |
|
uint32_t conn_idx) |
|
{ |
|
struct iscsi_conn *conn; |
|
struct iscsi_cls_conn *cls_conn; |
|
|
|
cls_conn = iscsi_conn_setup(cls_session, 0, conn_idx); |
|
if (!cls_conn) |
|
return NULL; |
|
conn = cls_conn->dd_data; |
|
|
|
/* |
|
* due to issues with the login code re iser sematics |
|
* this not set in iscsi_conn_setup - FIXME |
|
*/ |
|
conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN; |
|
|
|
return cls_conn; |
|
} |
|
|
|
/** |
|
* iscsi_iser_conn_bind() - bind iscsi and iser connection structures |
|
* @cls_session: iscsi class session |
|
* @cls_conn: iscsi class connection |
|
* @transport_eph: transport end-point handle |
|
* @is_leading: indicate if this is the session leading connection (MCS) |
|
* |
|
* Return: zero on success, $error if iscsi_conn_bind fails and |
|
* -EINVAL in case end-point doesn't exsits anymore or iser connection |
|
* state is not UP (teardown already started). |
|
*/ |
|
static int |
|
iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session, |
|
struct iscsi_cls_conn *cls_conn, |
|
uint64_t transport_eph, |
|
int is_leading) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iser_conn *iser_conn; |
|
struct iscsi_endpoint *ep; |
|
int error; |
|
|
|
error = iscsi_conn_bind(cls_session, cls_conn, is_leading); |
|
if (error) |
|
return error; |
|
|
|
/* the transport ep handle comes from user space so it must be |
|
* verified against the global ib connections list */ |
|
ep = iscsi_lookup_endpoint(transport_eph); |
|
if (!ep) { |
|
iser_err("can't bind eph %llx\n", |
|
(unsigned long long)transport_eph); |
|
return -EINVAL; |
|
} |
|
iser_conn = ep->dd_data; |
|
|
|
mutex_lock(&iser_conn->state_mutex); |
|
if (iser_conn->state != ISER_CONN_UP) { |
|
error = -EINVAL; |
|
iser_err("iser_conn %p state is %d, teardown started\n", |
|
iser_conn, iser_conn->state); |
|
goto out; |
|
} |
|
|
|
error = iser_alloc_rx_descriptors(iser_conn, conn->session); |
|
if (error) |
|
goto out; |
|
|
|
/* binds the iSER connection retrieved from the previously |
|
* connected ep_handle to the iSCSI layer connection. exchanges |
|
* connection pointers */ |
|
iser_info("binding iscsi conn %p to iser_conn %p\n", conn, iser_conn); |
|
|
|
conn->dd_data = iser_conn; |
|
iser_conn->iscsi_conn = conn; |
|
|
|
out: |
|
mutex_unlock(&iser_conn->state_mutex); |
|
return error; |
|
} |
|
|
|
/** |
|
* iscsi_iser_conn_start() - start iscsi-iser connection |
|
* @cls_conn: iscsi class connection |
|
* |
|
* Notes: Here iser intialize (or re-initialize) stop_completion as |
|
* from this point iscsi must call conn_stop in session/connection |
|
* teardown so iser transport must wait for it. |
|
*/ |
|
static int |
|
iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn) |
|
{ |
|
struct iscsi_conn *iscsi_conn; |
|
struct iser_conn *iser_conn; |
|
|
|
iscsi_conn = cls_conn->dd_data; |
|
iser_conn = iscsi_conn->dd_data; |
|
reinit_completion(&iser_conn->stop_completion); |
|
|
|
return iscsi_conn_start(cls_conn); |
|
} |
|
|
|
/** |
|
* iscsi_iser_conn_stop() - stop iscsi-iser connection |
|
* @cls_conn: iscsi class connection |
|
* @flag: indicate if recover or terminate (passed as is) |
|
* |
|
* Notes: Calling iscsi_conn_stop might theoretically race with |
|
* DEVICE_REMOVAL event and dereference a previously freed RDMA device |
|
* handle, so we call it under iser the state lock to protect against |
|
* this kind of race. |
|
*/ |
|
static void |
|
iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
struct iser_conn *iser_conn = conn->dd_data; |
|
|
|
iser_info("stopping iscsi_conn: %p, iser_conn: %p\n", conn, iser_conn); |
|
|
|
/* |
|
* Userspace may have goofed up and not bound the connection or |
|
* might have only partially setup the connection. |
|
*/ |
|
if (iser_conn) { |
|
mutex_lock(&iser_conn->state_mutex); |
|
mutex_lock(&unbind_iser_conn_mutex); |
|
iser_conn_terminate(iser_conn); |
|
iscsi_conn_stop(cls_conn, flag); |
|
|
|
/* unbind */ |
|
iser_conn->iscsi_conn = NULL; |
|
conn->dd_data = NULL; |
|
mutex_unlock(&unbind_iser_conn_mutex); |
|
|
|
complete(&iser_conn->stop_completion); |
|
mutex_unlock(&iser_conn->state_mutex); |
|
} else { |
|
iscsi_conn_stop(cls_conn, flag); |
|
} |
|
} |
|
|
|
/** |
|
* iscsi_iser_session_destroy() - destroy iscsi-iser session |
|
* @cls_session: iscsi class session |
|
* |
|
* Removes and free iscsi host. |
|
*/ |
|
static void |
|
iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session) |
|
{ |
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); |
|
|
|
iscsi_session_teardown(cls_session); |
|
iscsi_host_remove(shost); |
|
iscsi_host_free(shost); |
|
} |
|
|
|
static inline unsigned int |
|
iser_dif_prot_caps(int prot_caps) |
|
{ |
|
int ret = 0; |
|
|
|
if (prot_caps & IB_PROT_T10DIF_TYPE_1) |
|
ret |= SHOST_DIF_TYPE1_PROTECTION | |
|
SHOST_DIX_TYPE0_PROTECTION | |
|
SHOST_DIX_TYPE1_PROTECTION; |
|
if (prot_caps & IB_PROT_T10DIF_TYPE_2) |
|
ret |= SHOST_DIF_TYPE2_PROTECTION | |
|
SHOST_DIX_TYPE2_PROTECTION; |
|
if (prot_caps & IB_PROT_T10DIF_TYPE_3) |
|
ret |= SHOST_DIF_TYPE3_PROTECTION | |
|
SHOST_DIX_TYPE3_PROTECTION; |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* iscsi_iser_session_create() - create an iscsi-iser session |
|
* @ep: iscsi end-point handle |
|
* @cmds_max: maximum commands in this session |
|
* @qdepth: session command queue depth |
|
* @initial_cmdsn: initiator command sequnce number |
|
* |
|
* Allocates and adds a scsi host, expose DIF supprot if |
|
* exists, and sets up an iscsi session. |
|
*/ |
|
static struct iscsi_cls_session * |
|
iscsi_iser_session_create(struct iscsi_endpoint *ep, |
|
uint16_t cmds_max, uint16_t qdepth, |
|
uint32_t initial_cmdsn) |
|
{ |
|
struct iscsi_cls_session *cls_session; |
|
struct Scsi_Host *shost; |
|
struct iser_conn *iser_conn = NULL; |
|
struct ib_conn *ib_conn; |
|
struct ib_device *ib_dev; |
|
u32 max_fr_sectors; |
|
|
|
shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0); |
|
if (!shost) |
|
return NULL; |
|
shost->transportt = iscsi_iser_scsi_transport; |
|
shost->cmd_per_lun = qdepth; |
|
shost->max_lun = iscsi_max_lun; |
|
shost->max_id = 0; |
|
shost->max_channel = 0; |
|
shost->max_cmd_len = 16; |
|
|
|
/* |
|
* older userspace tools (before 2.0-870) did not pass us |
|
* the leading conn's ep so this will be NULL; |
|
*/ |
|
if (ep) { |
|
iser_conn = ep->dd_data; |
|
shost->sg_tablesize = iser_conn->scsi_sg_tablesize; |
|
shost->can_queue = min_t(u16, cmds_max, iser_conn->max_cmds); |
|
|
|
mutex_lock(&iser_conn->state_mutex); |
|
if (iser_conn->state != ISER_CONN_UP) { |
|
iser_err("iser conn %p already started teardown\n", |
|
iser_conn); |
|
mutex_unlock(&iser_conn->state_mutex); |
|
goto free_host; |
|
} |
|
|
|
ib_conn = &iser_conn->ib_conn; |
|
ib_dev = ib_conn->device->ib_device; |
|
if (ib_conn->pi_support) { |
|
u32 sig_caps = ib_dev->attrs.sig_prot_cap; |
|
|
|
shost->sg_prot_tablesize = shost->sg_tablesize; |
|
scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps)); |
|
scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP | |
|
SHOST_DIX_GUARD_CRC); |
|
} |
|
|
|
if (!(ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)) |
|
shost->virt_boundary_mask = SZ_4K - 1; |
|
|
|
if (iscsi_host_add(shost, ib_dev->dev.parent)) { |
|
mutex_unlock(&iser_conn->state_mutex); |
|
goto free_host; |
|
} |
|
mutex_unlock(&iser_conn->state_mutex); |
|
} else { |
|
shost->can_queue = min_t(u16, cmds_max, ISER_DEF_XMIT_CMDS_MAX); |
|
if (iscsi_host_add(shost, NULL)) |
|
goto free_host; |
|
} |
|
|
|
max_fr_sectors = (shost->sg_tablesize * PAGE_SIZE) >> 9; |
|
shost->max_sectors = min(iser_max_sectors, max_fr_sectors); |
|
|
|
iser_dbg("iser_conn %p, sg_tablesize %u, max_sectors %u\n", |
|
iser_conn, shost->sg_tablesize, |
|
shost->max_sectors); |
|
|
|
if (shost->max_sectors < iser_max_sectors) |
|
iser_warn("max_sectors was reduced from %u to %u\n", |
|
iser_max_sectors, shost->max_sectors); |
|
|
|
cls_session = iscsi_session_setup(&iscsi_iser_transport, shost, |
|
shost->can_queue, 0, |
|
sizeof(struct iscsi_iser_task), |
|
initial_cmdsn, 0); |
|
if (!cls_session) |
|
goto remove_host; |
|
|
|
return cls_session; |
|
|
|
remove_host: |
|
iscsi_host_remove(shost); |
|
free_host: |
|
iscsi_host_free(shost); |
|
return NULL; |
|
} |
|
|
|
static int |
|
iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn, |
|
enum iscsi_param param, char *buf, int buflen) |
|
{ |
|
int value; |
|
|
|
switch (param) { |
|
case ISCSI_PARAM_MAX_RECV_DLENGTH: |
|
/* TBD */ |
|
break; |
|
case ISCSI_PARAM_HDRDGST_EN: |
|
sscanf(buf, "%d", &value); |
|
if (value) { |
|
iser_err("DataDigest wasn't negotiated to None\n"); |
|
return -EPROTO; |
|
} |
|
break; |
|
case ISCSI_PARAM_DATADGST_EN: |
|
sscanf(buf, "%d", &value); |
|
if (value) { |
|
iser_err("DataDigest wasn't negotiated to None\n"); |
|
return -EPROTO; |
|
} |
|
break; |
|
case ISCSI_PARAM_IFMARKER_EN: |
|
sscanf(buf, "%d", &value); |
|
if (value) { |
|
iser_err("IFMarker wasn't negotiated to No\n"); |
|
return -EPROTO; |
|
} |
|
break; |
|
case ISCSI_PARAM_OFMARKER_EN: |
|
sscanf(buf, "%d", &value); |
|
if (value) { |
|
iser_err("OFMarker wasn't negotiated to No\n"); |
|
return -EPROTO; |
|
} |
|
break; |
|
default: |
|
return iscsi_set_param(cls_conn, param, buf, buflen); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* iscsi_iser_conn_get_stats() - get iscsi connection statistics |
|
* @cls_conn: iscsi class connection |
|
* @stats: iscsi stats to output |
|
* |
|
* Output connection statistics. |
|
*/ |
|
static void |
|
iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats) |
|
{ |
|
struct iscsi_conn *conn = cls_conn->dd_data; |
|
|
|
stats->txdata_octets = conn->txdata_octets; |
|
stats->rxdata_octets = conn->rxdata_octets; |
|
stats->scsicmd_pdus = conn->scsicmd_pdus_cnt; |
|
stats->dataout_pdus = conn->dataout_pdus_cnt; |
|
stats->scsirsp_pdus = conn->scsirsp_pdus_cnt; |
|
stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */ |
|
stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */ |
|
stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt; |
|
stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt; |
|
stats->custom_length = 0; |
|
} |
|
|
|
static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep, |
|
enum iscsi_param param, char *buf) |
|
{ |
|
struct iser_conn *iser_conn = ep->dd_data; |
|
|
|
switch (param) { |
|
case ISCSI_PARAM_CONN_PORT: |
|
case ISCSI_PARAM_CONN_ADDRESS: |
|
if (!iser_conn || !iser_conn->ib_conn.cma_id) |
|
return -ENOTCONN; |
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *) |
|
&iser_conn->ib_conn.cma_id->route.addr.dst_addr, |
|
param, buf); |
|
default: |
|
break; |
|
} |
|
return -ENOSYS; |
|
} |
|
|
|
/** |
|
* iscsi_iser_ep_connect() - Initiate iSER connection establishment |
|
* @shost: scsi_host |
|
* @dst_addr: destination address |
|
* @non_blocking: indicate if routine can block |
|
* |
|
* Allocate an iscsi endpoint, an iser_conn structure and bind them. |
|
* After that start RDMA connection establishment via rdma_cm. We |
|
* don't allocate iser_conn embedded in iscsi_endpoint since in teardown |
|
* the endpoint will be destroyed at ep_disconnect while iser_conn will |
|
* cleanup its resources asynchronuously. |
|
* |
|
* Return: iscsi_endpoint created by iscsi layer or ERR_PTR(error) |
|
* if fails. |
|
*/ |
|
static struct iscsi_endpoint * |
|
iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr, |
|
int non_blocking) |
|
{ |
|
int err; |
|
struct iser_conn *iser_conn; |
|
struct iscsi_endpoint *ep; |
|
|
|
ep = iscsi_create_endpoint(0); |
|
if (!ep) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL); |
|
if (!iser_conn) { |
|
err = -ENOMEM; |
|
goto failure; |
|
} |
|
|
|
ep->dd_data = iser_conn; |
|
iser_conn->ep = ep; |
|
iser_conn_init(iser_conn); |
|
|
|
err = iser_connect(iser_conn, NULL, dst_addr, non_blocking); |
|
if (err) |
|
goto failure; |
|
|
|
return ep; |
|
failure: |
|
iscsi_destroy_endpoint(ep); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/** |
|
* iscsi_iser_ep_poll() - poll for iser connection establishment to complete |
|
* @ep: iscsi endpoint (created at ep_connect) |
|
* @timeout_ms: polling timeout allowed in ms. |
|
* |
|
* This routine boils down to waiting for up_completion signaling |
|
* that cma_id got CONNECTED event. |
|
* |
|
* Return: 1 if succeeded in connection establishment, 0 if timeout expired |
|
* (libiscsi will retry will kick in) or -1 if interrupted by signal |
|
* or more likely iser connection state transitioned to TEMINATING or |
|
* DOWN during the wait period. |
|
*/ |
|
static int |
|
iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms) |
|
{ |
|
struct iser_conn *iser_conn = ep->dd_data; |
|
int rc; |
|
|
|
rc = wait_for_completion_interruptible_timeout(&iser_conn->up_completion, |
|
msecs_to_jiffies(timeout_ms)); |
|
/* if conn establishment failed, return error code to iscsi */ |
|
if (rc == 0) { |
|
mutex_lock(&iser_conn->state_mutex); |
|
if (iser_conn->state == ISER_CONN_TERMINATING || |
|
iser_conn->state == ISER_CONN_DOWN) |
|
rc = -1; |
|
mutex_unlock(&iser_conn->state_mutex); |
|
} |
|
|
|
iser_info("iser conn %p rc = %d\n", iser_conn, rc); |
|
|
|
if (rc > 0) |
|
return 1; /* success, this is the equivalent of EPOLLOUT */ |
|
else if (!rc) |
|
return 0; /* timeout */ |
|
else |
|
return rc; /* signal */ |
|
} |
|
|
|
/** |
|
* iscsi_iser_ep_disconnect() - Initiate connection teardown process |
|
* @ep: iscsi endpoint handle |
|
* |
|
* This routine is not blocked by iser and RDMA termination process |
|
* completion as we queue a deffered work for iser/RDMA destruction |
|
* and cleanup or actually call it immediately in case we didn't pass |
|
* iscsi conn bind/start stage, thus it is safe. |
|
*/ |
|
static void |
|
iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep) |
|
{ |
|
struct iser_conn *iser_conn = ep->dd_data; |
|
|
|
iser_info("ep %p iser conn %p\n", ep, iser_conn); |
|
|
|
mutex_lock(&iser_conn->state_mutex); |
|
iser_conn_terminate(iser_conn); |
|
|
|
/* |
|
* if iser_conn and iscsi_conn are bound, we must wait for |
|
* iscsi_conn_stop and flush errors completion before freeing |
|
* the iser resources. Otherwise we are safe to free resources |
|
* immediately. |
|
*/ |
|
if (iser_conn->iscsi_conn) { |
|
INIT_WORK(&iser_conn->release_work, iser_release_work); |
|
queue_work(release_wq, &iser_conn->release_work); |
|
mutex_unlock(&iser_conn->state_mutex); |
|
} else { |
|
iser_conn->state = ISER_CONN_DOWN; |
|
mutex_unlock(&iser_conn->state_mutex); |
|
iser_conn_release(iser_conn); |
|
} |
|
|
|
iscsi_destroy_endpoint(ep); |
|
} |
|
|
|
static umode_t iser_attr_is_visible(int param_type, int param) |
|
{ |
|
switch (param_type) { |
|
case ISCSI_HOST_PARAM: |
|
switch (param) { |
|
case ISCSI_HOST_PARAM_NETDEV_NAME: |
|
case ISCSI_HOST_PARAM_HWADDRESS: |
|
case ISCSI_HOST_PARAM_INITIATOR_NAME: |
|
return S_IRUGO; |
|
default: |
|
return 0; |
|
} |
|
case ISCSI_PARAM: |
|
switch (param) { |
|
case ISCSI_PARAM_MAX_RECV_DLENGTH: |
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
|
case ISCSI_PARAM_HDRDGST_EN: |
|
case ISCSI_PARAM_DATADGST_EN: |
|
case ISCSI_PARAM_CONN_ADDRESS: |
|
case ISCSI_PARAM_CONN_PORT: |
|
case ISCSI_PARAM_EXP_STATSN: |
|
case ISCSI_PARAM_PERSISTENT_ADDRESS: |
|
case ISCSI_PARAM_PERSISTENT_PORT: |
|
case ISCSI_PARAM_PING_TMO: |
|
case ISCSI_PARAM_RECV_TMO: |
|
case ISCSI_PARAM_INITIAL_R2T_EN: |
|
case ISCSI_PARAM_MAX_R2T: |
|
case ISCSI_PARAM_IMM_DATA_EN: |
|
case ISCSI_PARAM_FIRST_BURST: |
|
case ISCSI_PARAM_MAX_BURST: |
|
case ISCSI_PARAM_PDU_INORDER_EN: |
|
case ISCSI_PARAM_DATASEQ_INORDER_EN: |
|
case ISCSI_PARAM_TARGET_NAME: |
|
case ISCSI_PARAM_TPGT: |
|
case ISCSI_PARAM_USERNAME: |
|
case ISCSI_PARAM_PASSWORD: |
|
case ISCSI_PARAM_USERNAME_IN: |
|
case ISCSI_PARAM_PASSWORD_IN: |
|
case ISCSI_PARAM_FAST_ABORT: |
|
case ISCSI_PARAM_ABORT_TMO: |
|
case ISCSI_PARAM_LU_RESET_TMO: |
|
case ISCSI_PARAM_TGT_RESET_TMO: |
|
case ISCSI_PARAM_IFACE_NAME: |
|
case ISCSI_PARAM_INITIATOR_NAME: |
|
case ISCSI_PARAM_DISCOVERY_SESS: |
|
return S_IRUGO; |
|
default: |
|
return 0; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct scsi_host_template iscsi_iser_sht = { |
|
.module = THIS_MODULE, |
|
.name = "iSCSI Initiator over iSER", |
|
.queuecommand = iscsi_queuecommand, |
|
.change_queue_depth = scsi_change_queue_depth, |
|
.sg_tablesize = ISCSI_ISER_DEF_SG_TABLESIZE, |
|
.cmd_per_lun = ISER_DEF_CMD_PER_LUN, |
|
.eh_timed_out = iscsi_eh_cmd_timed_out, |
|
.eh_abort_handler = iscsi_eh_abort, |
|
.eh_device_reset_handler= iscsi_eh_device_reset, |
|
.eh_target_reset_handler = iscsi_eh_recover_target, |
|
.target_alloc = iscsi_target_alloc, |
|
.proc_name = "iscsi_iser", |
|
.this_id = -1, |
|
.track_queue_depth = 1, |
|
}; |
|
|
|
static struct iscsi_transport iscsi_iser_transport = { |
|
.owner = THIS_MODULE, |
|
.name = "iser", |
|
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_TEXT_NEGO, |
|
/* session management */ |
|
.create_session = iscsi_iser_session_create, |
|
.destroy_session = iscsi_iser_session_destroy, |
|
/* connection management */ |
|
.create_conn = iscsi_iser_conn_create, |
|
.bind_conn = iscsi_iser_conn_bind, |
|
.destroy_conn = iscsi_conn_teardown, |
|
.attr_is_visible = iser_attr_is_visible, |
|
.set_param = iscsi_iser_set_param, |
|
.get_conn_param = iscsi_conn_get_param, |
|
.get_ep_param = iscsi_iser_get_ep_param, |
|
.get_session_param = iscsi_session_get_param, |
|
.start_conn = iscsi_iser_conn_start, |
|
.stop_conn = iscsi_iser_conn_stop, |
|
/* iscsi host params */ |
|
.get_host_param = iscsi_host_get_param, |
|
.set_host_param = iscsi_host_set_param, |
|
/* IO */ |
|
.send_pdu = iscsi_conn_send_pdu, |
|
.get_stats = iscsi_iser_conn_get_stats, |
|
.init_task = iscsi_iser_task_init, |
|
.xmit_task = iscsi_iser_task_xmit, |
|
.cleanup_task = iscsi_iser_cleanup_task, |
|
.alloc_pdu = iscsi_iser_pdu_alloc, |
|
.check_protection = iscsi_iser_check_protection, |
|
/* recovery */ |
|
.session_recovery_timedout = iscsi_session_recovery_timedout, |
|
|
|
.ep_connect = iscsi_iser_ep_connect, |
|
.ep_poll = iscsi_iser_ep_poll, |
|
.ep_disconnect = iscsi_iser_ep_disconnect |
|
}; |
|
|
|
static int __init iser_init(void) |
|
{ |
|
int err; |
|
|
|
iser_dbg("Starting iSER datamover...\n"); |
|
|
|
memset(&ig, 0, sizeof(struct iser_global)); |
|
|
|
ig.desc_cache = kmem_cache_create("iser_descriptors", |
|
sizeof(struct iser_tx_desc), |
|
0, SLAB_HWCACHE_ALIGN, |
|
NULL); |
|
if (ig.desc_cache == NULL) |
|
return -ENOMEM; |
|
|
|
/* device init is called only after the first addr resolution */ |
|
mutex_init(&ig.device_list_mutex); |
|
INIT_LIST_HEAD(&ig.device_list); |
|
mutex_init(&ig.connlist_mutex); |
|
INIT_LIST_HEAD(&ig.connlist); |
|
|
|
release_wq = alloc_workqueue("release workqueue", 0, 0); |
|
if (!release_wq) { |
|
iser_err("failed to allocate release workqueue\n"); |
|
err = -ENOMEM; |
|
goto err_alloc_wq; |
|
} |
|
|
|
iscsi_iser_scsi_transport = iscsi_register_transport( |
|
&iscsi_iser_transport); |
|
if (!iscsi_iser_scsi_transport) { |
|
iser_err("iscsi_register_transport failed\n"); |
|
err = -EINVAL; |
|
goto err_reg; |
|
} |
|
|
|
return 0; |
|
|
|
err_reg: |
|
destroy_workqueue(release_wq); |
|
err_alloc_wq: |
|
kmem_cache_destroy(ig.desc_cache); |
|
|
|
return err; |
|
} |
|
|
|
static void __exit iser_exit(void) |
|
{ |
|
struct iser_conn *iser_conn, *n; |
|
int connlist_empty; |
|
|
|
iser_dbg("Removing iSER datamover...\n"); |
|
destroy_workqueue(release_wq); |
|
|
|
mutex_lock(&ig.connlist_mutex); |
|
connlist_empty = list_empty(&ig.connlist); |
|
mutex_unlock(&ig.connlist_mutex); |
|
|
|
if (!connlist_empty) { |
|
iser_err("Error cleanup stage completed but we still have iser " |
|
"connections, destroying them anyway\n"); |
|
list_for_each_entry_safe(iser_conn, n, &ig.connlist, |
|
conn_list) { |
|
iser_conn_release(iser_conn); |
|
} |
|
} |
|
|
|
iscsi_unregister_transport(&iscsi_iser_transport); |
|
kmem_cache_destroy(ig.desc_cache); |
|
} |
|
|
|
module_init(iser_init); |
|
module_exit(iser_exit);
|
|
|