author | Florian Westphal <fw@strlen.de> |
Thu, 09 Apr 2009 12:07:21 +0200 | |
changeset 2 | d1f6d8b6f81c |
parent 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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/* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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* iSCSI transport class definitions |
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Port of Linux 2.6.28 for use with network simulation cradle.
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parents:
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) IBM Corporation, 2004 |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) Mike Christie, 2004 - 2006 |
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* Copyright (C) Dmitry Yusupov, 2004 - 2005 |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* Copyright (C) Alex Aizman, 2004 - 2005 |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This program is free software; you can redistribute it and/or modify |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* it under the terms of the GNU General Public License as published by |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* the Free Software Foundation; either version 2 of the License, or |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* (at your option) any later version. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* This program is distributed in the hope that it will be useful, |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* GNU General Public License for more details. |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* |
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Port of Linux 2.6.28 for use with network simulation cradle.
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* You should have received a copy of the GNU General Public License |
aa628870c1d3
Port of Linux 2.6.28 for use with network simulation cradle.
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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Port of Linux 2.6.28 for use with network simulation cradle.
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*/ |
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#ifndef SCSI_TRANSPORT_ISCSI_H |
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#define SCSI_TRANSPORT_ISCSI_H |
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|
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#include <linux/device.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <scsi/iscsi_if.h> |
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|
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struct scsi_transport_template; |
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struct iscsi_transport; |
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struct iscsi_endpoint; |
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struct Scsi_Host; |
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struct iscsi_cls_conn; |
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struct iscsi_conn; |
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struct iscsi_task; |
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struct sockaddr; |
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|
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/** |
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* struct iscsi_transport - iSCSI Transport template |
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* |
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* @name: transport name |
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* @caps: iSCSI Data-Path capabilities |
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* @create_session: create new iSCSI session object |
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* @destroy_session: destroy existing iSCSI session object |
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* @create_conn: create new iSCSI connection |
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* @bind_conn: associate this connection with existing iSCSI session |
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* and specified transport descriptor |
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* @destroy_conn: destroy inactive iSCSI connection |
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* @set_param: set iSCSI parameter. Return 0 on success, -ENODATA |
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* when param is not supported, and a -Exx value on other |
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* error. |
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* @get_param get iSCSI parameter. Must return number of bytes |
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* copied to buffer on success, -ENODATA when param |
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* is not supported, and a -Exx value on other error |
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* @start_conn: set connection to be operational |
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* @stop_conn: suspend/recover/terminate connection |
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* @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. |
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* @session_recovery_timedout: notify LLD a block during recovery timed out |
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* @init_task: Initialize a iscsi_task and any internal structs. |
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* When offloading the data path, this is called from |
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* queuecommand with the session lock, or from the |
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* iscsi_conn_send_pdu context with the session lock. |
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* When not offloading the data path, this is called |
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* from the scsi work queue without the session lock. |
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* @xmit_task Requests LLD to transfer cmd task. Returns 0 or the |
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* the number of bytes transferred on success, and -Exyz |
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* value on error. When offloading the data path, this |
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* is called from queuecommand with the session lock, or |
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* from the iscsi_conn_send_pdu context with the session |
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* lock. When not offloading the data path, this is called |
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* from the scsi work queue without the session lock. |
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* @cleanup_task: requests LLD to fail task. Called with session lock |
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* and after the connection has been suspended and |
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* terminated during recovery. If called |
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* from abort task then connection is not suspended |
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* or terminated but sk_callback_lock is held |
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* |
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* Template API provided by iSCSI Transport |
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*/ |
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struct iscsi_transport { |
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struct module *owner; |
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char *name; |
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unsigned int caps; |
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/* LLD sets this to indicate what values it can export to sysfs */ |
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uint64_t param_mask; |
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uint64_t host_param_mask; |
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struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, |
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uint16_t cmds_max, uint16_t qdepth, |
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uint32_t sn, uint32_t *hn); |
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void (*destroy_session) (struct iscsi_cls_session *session); |
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struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, |
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uint32_t cid); |
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int (*bind_conn) (struct iscsi_cls_session *session, |
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struct iscsi_cls_conn *cls_conn, |
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uint64_t transport_eph, int is_leading); |
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int (*start_conn) (struct iscsi_cls_conn *conn); |
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void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); |
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void (*destroy_conn) (struct iscsi_cls_conn *conn); |
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int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, |
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char *buf, int buflen); |
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int (*get_conn_param) (struct iscsi_cls_conn *conn, |
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enum iscsi_param param, char *buf); |
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int (*get_session_param) (struct iscsi_cls_session *session, |
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enum iscsi_param param, char *buf); |
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int (*get_host_param) (struct Scsi_Host *shost, |
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enum iscsi_host_param param, char *buf); |
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109 |
int (*set_host_param) (struct Scsi_Host *shost, |
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enum iscsi_host_param param, char *buf, |
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int buflen); |
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int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
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char *data, uint32_t data_size); |
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void (*get_stats) (struct iscsi_cls_conn *conn, |
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115 |
struct iscsi_stats *stats); |
2 | 116 |
|
0
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int (*init_task) (struct iscsi_task *task); |
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int (*xmit_task) (struct iscsi_task *task); |
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void (*cleanup_task) (struct iscsi_task *task); |
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||
121 |
int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); |
|
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int (*xmit_pdu) (struct iscsi_task *task); |
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int (*init_pdu) (struct iscsi_task *task, unsigned int offset, |
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124 |
unsigned int count); |
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void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, |
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int *index, int *age); |
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void (*session_recovery_timedout) (struct iscsi_cls_session *session); |
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struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr, |
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int non_blocking); |
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int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); |
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void (*ep_disconnect) (struct iscsi_endpoint *ep); |
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int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, |
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uint32_t enable, struct sockaddr *dst_addr); |
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135 |
}; |
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136 |
|
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137 |
/* |
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* transport registration upcalls |
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139 |
*/ |
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extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); |
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extern int iscsi_unregister_transport(struct iscsi_transport *tt); |
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142 |
|
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143 |
/* |
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144 |
* control plane upcalls |
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145 |
*/ |
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146 |
extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, |
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enum iscsi_err error); |
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extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
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char *data, uint32_t data_size); |
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150 |
|
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struct iscsi_cls_conn { |
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struct list_head conn_list; /* item in connlist */ |
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void *dd_data; /* LLD private data */ |
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154 |
struct iscsi_transport *transport; |
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155 |
uint32_t cid; /* connection id */ |
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156 |
|
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157 |
int active; /* must be accessed with the connlock */ |
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158 |
struct device dev; /* sysfs transport/container device */ |
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159 |
}; |
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160 |
|
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161 |
#define iscsi_dev_to_conn(_dev) \ |
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162 |
container_of(_dev, struct iscsi_cls_conn, dev) |
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163 |
|
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164 |
#define iscsi_conn_to_session(_conn) \ |
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165 |
iscsi_dev_to_session(_conn->dev.parent) |
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166 |
|
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167 |
/* iscsi class session state */ |
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168 |
enum { |
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169 |
ISCSI_SESSION_LOGGED_IN, |
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170 |
ISCSI_SESSION_FAILED, |
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171 |
ISCSI_SESSION_FREE, |
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172 |
}; |
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173 |
|
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174 |
#define ISCSI_MAX_TARGET -1 |
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175 |
|
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176 |
struct iscsi_cls_session { |
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177 |
struct list_head sess_list; /* item in session_list */ |
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178 |
struct iscsi_transport *transport; |
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179 |
spinlock_t lock; |
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180 |
struct work_struct block_work; |
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181 |
struct work_struct unblock_work; |
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182 |
struct work_struct scan_work; |
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183 |
struct work_struct unbind_work; |
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184 |
|
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185 |
/* recovery fields */ |
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186 |
int recovery_tmo; |
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187 |
struct delayed_work recovery_work; |
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188 |
|
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189 |
unsigned int target_id; |
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190 |
|
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191 |
int state; |
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192 |
int sid; /* session id */ |
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193 |
void *dd_data; /* LLD private data */ |
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|
194 |
struct device dev; /* sysfs transport/container device */ |
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195 |
}; |
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196 |
|
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197 |
#define iscsi_dev_to_session(_dev) \ |
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198 |
container_of(_dev, struct iscsi_cls_session, dev) |
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199 |
|
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200 |
#define iscsi_session_to_shost(_session) \ |
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201 |
dev_to_shost(_session->dev.parent) |
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202 |
|
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203 |
#define starget_to_session(_stgt) \ |
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204 |
iscsi_dev_to_session(_stgt->dev.parent) |
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205 |
|
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206 |
struct iscsi_cls_host { |
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207 |
atomic_t nr_scans; |
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208 |
struct mutex mutex; |
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209 |
struct workqueue_struct *scan_workq; |
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210 |
char scan_workq_name[20]; |
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|
211 |
}; |
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212 |
|
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213 |
extern void iscsi_host_for_each_session(struct Scsi_Host *shost, |
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214 |
void (*fn)(struct iscsi_cls_session *)); |
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215 |
|
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216 |
struct iscsi_endpoint { |
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217 |
void *dd_data; /* LLD private data */ |
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218 |
struct device dev; |
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219 |
uint64_t id; |
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220 |
}; |
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221 |
|
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222 |
/* |
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223 |
* session and connection functions that can be used by HW iSCSI LLDs |
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224 |
*/ |
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225 |
#define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ |
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226 |
dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) |
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227 |
|
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228 |
#define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ |
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dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) |
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extern int iscsi_session_chkready(struct iscsi_cls_session *session); |
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extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, |
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struct iscsi_transport *transport, int dd_size); |
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extern int iscsi_add_session(struct iscsi_cls_session *session, |
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unsigned int target_id); |
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extern int iscsi_session_event(struct iscsi_cls_session *session, |
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enum iscsi_uevent_e event); |
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extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, |
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struct iscsi_transport *t, |
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int dd_size, |
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unsigned int target_id); |
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extern void iscsi_remove_session(struct iscsi_cls_session *session); |
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extern void iscsi_free_session(struct iscsi_cls_session *session); |
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extern int iscsi_destroy_session(struct iscsi_cls_session *session); |
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extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, |
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int dd_size, uint32_t cid); |
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extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); |
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extern void iscsi_unblock_session(struct iscsi_cls_session *session); |
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extern void iscsi_block_session(struct iscsi_cls_session *session); |
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extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); |
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extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); |
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extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); |
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extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); |
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#endif |