2 * iSCSI lib definitions
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include <linux/types.h>
27 #include <linux/mutex.h>
28 #include <scsi/iscsi_proto.h>
29 #include <scsi/iscsi_if.h>
31 struct scsi_transport_template
;
36 struct iscsi_transport
;
37 struct iscsi_cls_session
;
38 struct iscsi_cls_conn
;
42 /* #define DEBUG_SCSI */
44 #define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
46 #define debug_scsi(fmt...)
49 #define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */
50 #define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */
51 #define ISCSI_CONN_MAX 1
53 #define ISCSI_MGMT_ITT_OFFSET 0xa00
55 #define ISCSI_DEF_CMD_PER_LUN 32
56 #define ISCSI_MAX_CMD_PER_LUN 128
58 /* Task Mgmt states */
59 #define TMABORT_INITIAL 0x0
60 #define TMABORT_SUCCESS 0x1
61 #define TMABORT_FAILED 0x2
62 #define TMABORT_TIMEDOUT 0x3
64 /* Connection suspend "bit" */
65 #define ISCSI_SUSPEND_BIT 1
67 #define ISCSI_ITT_MASK (0xfff)
68 #define ISCSI_CID_SHIFT 12
69 #define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT)
70 #define ISCSI_AGE_SHIFT 28
71 #define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
73 struct iscsi_mgmt_task
{
75 * Becuae LLDs allocate their hdr differently, this is a pointer to
76 * that storage. It must be setup at session creation time.
78 struct iscsi_hdr
*hdr
;
79 char *data
; /* mgmt payload */
80 int data_count
; /* counts data to be sent */
81 uint32_t itt
; /* this ITT */
82 void *dd_data
; /* driver/transport data */
83 struct list_head running
;
92 struct iscsi_cmd_task
{
94 * Becuae LLDs allocate their hdr differently, this is a pointer to
95 * that storage. It must be setup at session creation time.
97 struct iscsi_cmd
*hdr
;
98 int itt
; /* this ITT */
99 int datasn
; /* DataSN */
101 uint32_t unsol_datasn
;
102 int imm_count
; /* imm-data (bytes) */
103 int unsol_count
; /* unsolicited (bytes)*/
104 int data_count
; /* remaining Data-Out */
105 struct scsi_cmnd
*sc
; /* associated SCSI cmd*/
107 struct iscsi_conn
*conn
; /* used connection */
108 struct iscsi_mgmt_task
*mtask
; /* tmf mtask in progr */
110 /* state set/tested under session->lock */
112 struct list_head running
; /* running cmd list */
113 void *dd_data
; /* driver/transport data */
117 struct iscsi_cls_conn
*cls_conn
; /* ptr to class connection */
118 void *dd_data
; /* iscsi_transport data */
119 struct iscsi_session
*session
; /* parent session */
121 * LLDs should set this lock. It protects the transport recv
126 * conn_stop() flag: stop to recover, stop to terminate
130 /* iSCSI connection-wide sequencing */
135 struct list_head item
; /* maintains list of conns */
136 int c_stage
; /* connection state */
137 struct iscsi_mgmt_task
*login_mtask
; /* mtask used for login/text */
138 struct iscsi_mgmt_task
*mtask
; /* xmit mtask in progress */
139 struct iscsi_cmd_task
*ctask
; /* xmit ctask in progress */
142 struct kfifo
*immqueue
; /* immediate xmit queue */
143 struct kfifo
*mgmtqueue
; /* mgmt (control) xmit queue */
144 struct list_head mgmt_run_list
; /* list of control tasks */
145 struct list_head xmitqueue
; /* data-path cmd queue */
146 struct list_head run_list
; /* list of cmds in progress */
147 struct work_struct xmitwork
; /* per-conn. xmit workqueue */
149 * serializes connection xmit, access to kfifos:
150 * xmitqueue, immqueue, mgmtqueue
152 struct mutex xmitmutex
;
154 unsigned long suspend_tx
; /* suspend Tx */
155 unsigned long suspend_rx
; /* suspend Rx */
158 wait_queue_head_t ehwait
; /* used in eh_abort() */
159 struct iscsi_tm tmhdr
;
160 struct timer_list tmabort_timer
;
161 int tmabort_state
; /* see TMABORT_INITIAL, etc.*/
163 /* negotiated params */
164 int max_recv_dlength
; /* initiator_max_recv_dsl*/
165 int max_xmit_dlength
; /* target_max_recv_dsl */
170 /* values userspace uses to id a conn */
172 char *persistent_address
;
175 uint64_t txdata_octets
;
176 uint64_t rxdata_octets
;
177 uint32_t scsicmd_pdus_cnt
;
178 uint32_t dataout_pdus_cnt
;
179 uint32_t scsirsp_pdus_cnt
;
180 uint32_t datain_pdus_cnt
;
181 uint32_t r2t_pdus_cnt
;
182 uint32_t tmfcmd_pdus_cnt
;
183 int32_t tmfrsp_pdus_cnt
;
185 /* custom statistics */
186 uint32_t eh_abort_cnt
;
190 struct kfifo
*queue
; /* FIFO Queue */
191 void **pool
; /* Pool of elements */
192 int max
; /* Max number of elements */
195 struct iscsi_session
{
196 /* iSCSI session-wide sequencing */
210 int dataseq_inorder_en
;
216 struct iscsi_transport
*tt
;
217 struct Scsi_Host
*host
;
218 struct iscsi_conn
*leadconn
; /* leading connection */
219 spinlock_t lock
; /* protects session state, *
220 * sequence numbers, *
221 * session resources: *
225 int state
; /* session state */
226 struct list_head item
;
227 int age
; /* counts session re-opens */
229 struct list_head connections
; /* list of connections */
230 int cmds_max
; /* size of cmds array */
231 struct iscsi_cmd_task
**cmds
; /* Original Cmds arr */
232 struct iscsi_queue cmdpool
; /* PDU's pool */
233 int mgmtpool_max
; /* size of mgmt array */
234 struct iscsi_mgmt_task
**mgmt_cmds
; /* Original mgmt arr */
235 struct iscsi_queue mgmtpool
; /* Mgmt PDU's pool */
241 extern int iscsi_change_queue_depth(struct scsi_device
*sdev
, int depth
);
242 extern int iscsi_eh_abort(struct scsi_cmnd
*sc
);
243 extern int iscsi_eh_host_reset(struct scsi_cmnd
*sc
);
244 extern int iscsi_queuecommand(struct scsi_cmnd
*sc
,
245 void (*done
)(struct scsi_cmnd
*));
250 extern struct iscsi_cls_session
*
251 iscsi_session_setup(struct iscsi_transport
*, struct scsi_transport_template
*,
252 int, int, uint32_t, uint32_t *);
253 extern void iscsi_session_teardown(struct iscsi_cls_session
*);
254 extern struct iscsi_session
*class_to_transport_session(struct iscsi_cls_session
*);
255 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session
*);
256 extern int iscsi_set_param(struct iscsi_cls_conn
*cls_conn
,
257 enum iscsi_param param
, char *buf
, int buflen
);
258 extern int iscsi_session_get_param(struct iscsi_cls_session
*cls_session
,
259 enum iscsi_param param
, char *buf
);
261 #define session_to_cls(_sess) \
262 hostdata_session(_sess->host->hostdata)
265 * connection management
267 extern struct iscsi_cls_conn
*iscsi_conn_setup(struct iscsi_cls_session
*,
269 extern void iscsi_conn_teardown(struct iscsi_cls_conn
*);
270 extern int iscsi_conn_start(struct iscsi_cls_conn
*);
271 extern void iscsi_conn_stop(struct iscsi_cls_conn
*, int);
272 extern int iscsi_conn_bind(struct iscsi_cls_session
*, struct iscsi_cls_conn
*,
274 extern void iscsi_conn_failure(struct iscsi_conn
*conn
, enum iscsi_err err
);
275 extern int iscsi_conn_get_param(struct iscsi_cls_conn
*cls_conn
,
276 enum iscsi_param param
, char *buf
);
279 * pdu and task processing
281 extern int iscsi_check_assign_cmdsn(struct iscsi_session
*,
282 struct iscsi_nopin
*);
283 extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task
*,
284 struct iscsi_data
*hdr
,
285 int transport_data_cnt
);
286 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn
*, struct iscsi_hdr
*,
288 extern int iscsi_complete_pdu(struct iscsi_conn
*, struct iscsi_hdr
*,
290 extern int __iscsi_complete_pdu(struct iscsi_conn
*, struct iscsi_hdr
*,
292 extern int iscsi_verify_itt(struct iscsi_conn
*, struct iscsi_hdr
*,
298 extern void iscsi_pool_free(struct iscsi_queue
*, void **);
299 extern int iscsi_pool_init(struct iscsi_queue
*, int, void ***, int);
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