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1/*
2 * iSCSI lib definitions
3 *
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
8 *
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.
13 *
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.
18 *
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.
22 */
23#ifndef LIBISCSI_H
24#define LIBISCSI_H
25
26#include <linux/types.h>
27#include <linux/wait.h>
28#include <linux/mutex.h>
29#include <linux/timer.h>
30#include <linux/workqueue.h>
31#include <linux/kfifo.h>
32#include <scsi/iscsi_proto.h>
33#include <scsi/iscsi_if.h>
34#include <scsi/scsi_transport_iscsi.h>
35
36struct scsi_transport_template;
37struct scsi_host_template;
38struct scsi_device;
39struct Scsi_Host;
40struct scsi_target;
41struct scsi_cmnd;
42struct socket;
43struct iscsi_transport;
44struct iscsi_cls_session;
45struct iscsi_cls_conn;
46struct iscsi_session;
47struct iscsi_nopin;
48struct device;
49
50#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
51#define ISCSI_MGMT_CMDS_MAX 15
52
53#define ISCSI_DEF_CMD_PER_LUN 32
54
55/* Task Mgmt states */
56enum {
57 TMF_INITIAL,
58 TMF_QUEUED,
59 TMF_SUCCESS,
60 TMF_FAILED,
61 TMF_TIMEDOUT,
62 TMF_NOT_FOUND,
63};
64
65/* Connection suspend "bit" */
66#define ISCSI_SUSPEND_BIT 1
67
68#define ISCSI_ITT_MASK 0x1fff
69#define ISCSI_TOTAL_CMDS_MAX 4096
70/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
71#define ISCSI_TOTAL_CMDS_MIN 16
72#define ISCSI_AGE_SHIFT 28
73#define ISCSI_AGE_MASK 0xf
74
75#define ISCSI_ADDRESS_BUF_LEN 64
76
77enum {
78 /* this is the maximum possible storage for AHSs */
79 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
80 sizeof(struct iscsi_rlength_ahdr),
81 ISCSI_DIGEST_SIZE = sizeof(__u32),
82};
83
84
85enum {
86 ISCSI_TASK_FREE,
87 ISCSI_TASK_COMPLETED,
88 ISCSI_TASK_PENDING,
89 ISCSI_TASK_RUNNING,
90 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
91 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
92 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
93};
94
95struct iscsi_r2t_info {
96 __be32 ttt; /* copied from R2T */
97 __be32 exp_statsn; /* copied from R2T */
98 uint32_t data_length; /* copied from R2T */
99 uint32_t data_offset; /* copied from R2T */
100 int data_count; /* DATA-Out payload progress */
101 int datasn;
102 /* LLDs should set/update these values */
103 int sent; /* R2T sequence progress */
104};
105
106struct iscsi_task {
107 /*
108 * Because LLDs allocate their hdr differently, this is a pointer
109 * and length to that storage. It must be setup at session
110 * creation time.
111 */
112 struct iscsi_hdr *hdr;
113 unsigned short hdr_max;
114 unsigned short hdr_len; /* accumulated size of hdr used */
115 /* copied values in case we need to send tmfs */
116 itt_t hdr_itt;
117 __be32 cmdsn;
118 struct scsi_lun lun;
119
120 int itt; /* this ITT */
121
122 unsigned imm_count; /* imm-data (bytes) */
123 /* offset in unsolicited stream (bytes); */
124 struct iscsi_r2t_info unsol_r2t;
125 char *data; /* mgmt payload */
126 unsigned data_count;
127 struct scsi_cmnd *sc; /* associated SCSI cmd*/
128 struct iscsi_conn *conn; /* used connection */
129
130 /* data processing tracking */
131 unsigned long last_xfer;
132 unsigned long last_timeout;
133 bool have_checked_conn;
134 /* state set/tested under session->lock */
135 int state;
136 atomic_t refcount;
137 struct list_head running; /* running cmd list */
138 void *dd_data; /* driver/transport data */
139};
140
141static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
142{
143 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
144}
145
146static inline void* iscsi_next_hdr(struct iscsi_task *task)
147{
148 return (void*)task->hdr + task->hdr_len;
149}
150
151/* Connection's states */
152enum {
153 ISCSI_CONN_INITIAL_STAGE,
154 ISCSI_CONN_STARTED,
155 ISCSI_CONN_STOPPED,
156 ISCSI_CONN_CLEANUP_WAIT,
157};
158
159struct iscsi_conn {
160 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
161 void *dd_data; /* iscsi_transport data */
162 struct iscsi_session *session; /* parent session */
163 /*
164 * conn_stop() flag: stop to recover, stop to terminate
165 */
166 int stop_stage;
167 struct timer_list transport_timer;
168 unsigned long last_recv;
169 unsigned long last_ping;
170 int ping_timeout;
171 int recv_timeout;
172 struct iscsi_task *ping_task;
173
174 /* iSCSI connection-wide sequencing */
175 uint32_t exp_statsn;
176
177 /* control data */
178 int id; /* CID */
179 int c_stage; /* connection state */
180 /*
181 * Preallocated buffer for pdus that have data but do not
182 * originate from scsi-ml. We never have two pdus using the
183 * buffer at the same time. It is only allocated to
184 * the default max recv size because the pdus we support
185 * should always fit in this buffer
186 */
187 char *data;
188 struct iscsi_task *login_task; /* mtask used for login/text */
189 struct iscsi_task *task; /* xmit task in progress */
190
191 /* xmit */
192 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
193 struct list_head cmdqueue; /* data-path cmd queue */
194 struct list_head requeue; /* tasks needing another run */
195 struct work_struct xmitwork; /* per-conn. xmit workqueue */
196 unsigned long suspend_tx; /* suspend Tx */
197 unsigned long suspend_rx; /* suspend Rx */
198
199 /* abort */
200 wait_queue_head_t ehwait; /* used in eh_abort() */
201 struct iscsi_tm tmhdr;
202 struct timer_list tmf_timer;
203 int tmf_state; /* see TMF_INITIAL, etc.*/
204
205 /* negotiated params */
206 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
207 unsigned max_xmit_dlength; /* target_max_recv_dsl */
208 int hdrdgst_en;
209 int datadgst_en;
210 int ifmarker_en;
211 int ofmarker_en;
212 /* values userspace uses to id a conn */
213 int persistent_port;
214 char *persistent_address;
215
216 /* MIB-statistics */
217 uint64_t txdata_octets;
218 uint64_t rxdata_octets;
219 uint32_t scsicmd_pdus_cnt;
220 uint32_t dataout_pdus_cnt;
221 uint32_t scsirsp_pdus_cnt;
222 uint32_t datain_pdus_cnt;
223 uint32_t r2t_pdus_cnt;
224 uint32_t tmfcmd_pdus_cnt;
225 int32_t tmfrsp_pdus_cnt;
226
227 /* custom statistics */
228 uint32_t eh_abort_cnt;
229 uint32_t fmr_unalign_cnt;
230};
231
232struct iscsi_pool {
233 struct kfifo queue; /* FIFO Queue */
234 void **pool; /* Pool of elements */
235 int max; /* Max number of elements */
236};
237
238/* Session's states */
239enum {
240 ISCSI_STATE_FREE = 1,
241 ISCSI_STATE_LOGGED_IN,
242 ISCSI_STATE_FAILED,
243 ISCSI_STATE_TERMINATE,
244 ISCSI_STATE_IN_RECOVERY,
245 ISCSI_STATE_RECOVERY_FAILED,
246 ISCSI_STATE_LOGGING_OUT,
247};
248
249struct iscsi_session {
250 struct iscsi_cls_session *cls_session;
251 /*
252 * Syncs up the scsi eh thread with the iscsi eh thread when sending
253 * task management functions. This must be taken before the session
254 * and recv lock.
255 */
256 struct mutex eh_mutex;
257
258 /* iSCSI session-wide sequencing */
259 uint32_t cmdsn;
260 uint32_t exp_cmdsn;
261 uint32_t max_cmdsn;
262
263 /* This tracks the reqs queued into the initiator */
264 uint32_t queued_cmdsn;
265
266 /* configuration */
267 int abort_timeout;
268 int lu_reset_timeout;
269 int tgt_reset_timeout;
270 int initial_r2t_en;
271 unsigned max_r2t;
272 int imm_data_en;
273 unsigned first_burst;
274 unsigned max_burst;
275 int time2wait;
276 int time2retain;
277 int pdu_inorder_en;
278 int dataseq_inorder_en;
279 int erl;
280 int fast_abort;
281 int tpgt;
282 char *username;
283 char *username_in;
284 char *password;
285 char *password_in;
286 char *targetname;
287 char *ifacename;
288 char *initiatorname;
289 /* control data */
290 struct iscsi_transport *tt;
291 struct Scsi_Host *host;
292 struct iscsi_conn *leadconn; /* leading connection */
293 spinlock_t lock; /* protects session state, *
294 * sequence numbers, *
295 * session resources: *
296 * - cmdpool, *
297 * - mgmtpool, *
298 * - r2tpool */
299 int state; /* session state */
300 int age; /* counts session re-opens */
301
302 int scsi_cmds_max; /* max scsi commands */
303 int cmds_max; /* size of cmds array */
304 struct iscsi_task **cmds; /* Original Cmds arr */
305 struct iscsi_pool cmdpool; /* PDU's pool */
306 void *dd_data; /* LLD private data */
307};
308
309enum {
310 ISCSI_HOST_SETUP,
311 ISCSI_HOST_REMOVED,
312};
313
314struct iscsi_host {
315 char *initiatorname;
316 /* hw address or netdev iscsi connection is bound to */
317 char *hwaddress;
318 char *netdev;
319
320 wait_queue_head_t session_removal_wq;
321 /* protects sessions and state */
322 spinlock_t lock;
323 int num_sessions;
324 int state;
325
326 struct workqueue_struct *workq;
327 char workq_name[20];
328};
329
330/*
331 * scsi host template
332 */
333extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth,
334 int reason);
335extern int iscsi_eh_abort(struct scsi_cmnd *sc);
336extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
337extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
338extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
339extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
340
341/*
342 * iSCSI host helpers.
343 */
344#define iscsi_host_priv(_shost) \
345 (shost_priv(_shost) + sizeof(struct iscsi_host))
346
347extern int iscsi_host_set_param(struct Scsi_Host *shost,
348 enum iscsi_host_param param, char *buf,
349 int buflen);
350extern int iscsi_host_get_param(struct Scsi_Host *shost,
351 enum iscsi_host_param param, char *buf);
352extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
353extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
354 int dd_data_size,
355 bool xmit_can_sleep);
356extern void iscsi_host_remove(struct Scsi_Host *shost);
357extern void iscsi_host_free(struct Scsi_Host *shost);
358extern int iscsi_target_alloc(struct scsi_target *starget);
359
360/*
361 * session management
362 */
363extern struct iscsi_cls_session *
364iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
365 uint16_t, int, int, uint32_t, unsigned int);
366extern void iscsi_session_teardown(struct iscsi_cls_session *);
367extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
368extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
369 enum iscsi_param param, char *buf, int buflen);
370extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
371 enum iscsi_param param, char *buf);
372
373#define iscsi_session_printk(prefix, _sess, fmt, a...) \
374 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
375
376/*
377 * connection management
378 */
379extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
380 int, uint32_t);
381extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
382extern int iscsi_conn_start(struct iscsi_cls_conn *);
383extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
384extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
385 int);
386extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
387extern void iscsi_session_failure(struct iscsi_session *session,
388 enum iscsi_err err);
389extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
390 enum iscsi_param param, char *buf);
391extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
392 enum iscsi_param param, char *buf);
393extern void iscsi_suspend_tx(struct iscsi_conn *conn);
394extern void iscsi_suspend_queue(struct iscsi_conn *conn);
395extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
396
397#define iscsi_conn_printk(prefix, _c, fmt, a...) \
398 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
399 fmt, ##a)
400
401/*
402 * pdu and task processing
403 */
404extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
405extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
406 struct iscsi_r2t_info *r2t,
407 struct iscsi_data *hdr);
408extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
409 char *, uint32_t);
410extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
411 char *, int);
412extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
413 char *, int);
414extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
415extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
416extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
417extern void iscsi_requeue_task(struct iscsi_task *task);
418extern void iscsi_put_task(struct iscsi_task *task);
419extern void __iscsi_put_task(struct iscsi_task *task);
420extern void __iscsi_get_task(struct iscsi_task *task);
421extern void iscsi_complete_scsi_task(struct iscsi_task *task,
422 uint32_t exp_cmdsn, uint32_t max_cmdsn);
423
424/*
425 * generic helpers
426 */
427extern void iscsi_pool_free(struct iscsi_pool *);
428extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
429
430/*
431 * inline functions to deal with padding.
432 */
433static inline unsigned int
434iscsi_padded(unsigned int len)
435{
436 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
437}
438
439static inline unsigned int
440iscsi_padding(unsigned int len)
441{
442 len &= (ISCSI_PAD_LEN - 1);
443 if (len)
444 len = ISCSI_PAD_LEN - len;
445 return len;
446}
447
448#endif
1/*
2 * iSCSI lib definitions
3 *
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
8 *
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.
13 *
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.
18 *
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.
22 */
23#ifndef LIBISCSI_H
24#define LIBISCSI_H
25
26#include <linux/types.h>
27#include <linux/wait.h>
28#include <linux/mutex.h>
29#include <linux/timer.h>
30#include <linux/workqueue.h>
31#include <linux/kfifo.h>
32#include <scsi/iscsi_proto.h>
33#include <scsi/iscsi_if.h>
34#include <scsi/scsi_transport_iscsi.h>
35
36struct scsi_transport_template;
37struct scsi_host_template;
38struct scsi_device;
39struct Scsi_Host;
40struct scsi_target;
41struct scsi_cmnd;
42struct socket;
43struct iscsi_transport;
44struct iscsi_cls_session;
45struct iscsi_cls_conn;
46struct iscsi_session;
47struct iscsi_nopin;
48struct device;
49
50#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
51#define ISCSI_MGMT_CMDS_MAX 15
52
53#define ISCSI_DEF_CMD_PER_LUN 32
54
55/* Task Mgmt states */
56enum {
57 TMF_INITIAL,
58 TMF_QUEUED,
59 TMF_SUCCESS,
60 TMF_FAILED,
61 TMF_TIMEDOUT,
62 TMF_NOT_FOUND,
63};
64
65#define ISID_SIZE 6
66
67/* Connection suspend "bit" */
68#define ISCSI_SUSPEND_BIT 1
69
70#define ISCSI_ITT_MASK 0x1fff
71#define ISCSI_TOTAL_CMDS_MAX 4096
72/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
73#define ISCSI_TOTAL_CMDS_MIN 16
74#define ISCSI_AGE_SHIFT 28
75#define ISCSI_AGE_MASK 0xf
76
77#define ISCSI_ADDRESS_BUF_LEN 64
78
79enum {
80 /* this is the maximum possible storage for AHSs */
81 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
82 sizeof(struct iscsi_rlength_ahdr),
83 ISCSI_DIGEST_SIZE = sizeof(__u32),
84};
85
86
87enum {
88 ISCSI_TASK_FREE,
89 ISCSI_TASK_COMPLETED,
90 ISCSI_TASK_PENDING,
91 ISCSI_TASK_RUNNING,
92 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
93 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
94 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
95};
96
97struct iscsi_r2t_info {
98 __be32 ttt; /* copied from R2T */
99 __be32 exp_statsn; /* copied from R2T */
100 uint32_t data_length; /* copied from R2T */
101 uint32_t data_offset; /* copied from R2T */
102 int data_count; /* DATA-Out payload progress */
103 int datasn;
104 /* LLDs should set/update these values */
105 int sent; /* R2T sequence progress */
106};
107
108struct iscsi_task {
109 /*
110 * Because LLDs allocate their hdr differently, this is a pointer
111 * and length to that storage. It must be setup at session
112 * creation time.
113 */
114 struct iscsi_hdr *hdr;
115 unsigned short hdr_max;
116 unsigned short hdr_len; /* accumulated size of hdr used */
117 /* copied values in case we need to send tmfs */
118 itt_t hdr_itt;
119 __be32 cmdsn;
120 struct scsi_lun lun;
121
122 int itt; /* this ITT */
123
124 unsigned imm_count; /* imm-data (bytes) */
125 /* offset in unsolicited stream (bytes); */
126 struct iscsi_r2t_info unsol_r2t;
127 char *data; /* mgmt payload */
128 unsigned data_count;
129 struct scsi_cmnd *sc; /* associated SCSI cmd*/
130 struct iscsi_conn *conn; /* used connection */
131
132 /* data processing tracking */
133 unsigned long last_xfer;
134 unsigned long last_timeout;
135 bool have_checked_conn;
136
137 /* T10 protection information */
138 bool protected;
139
140 /* state set/tested under session->lock */
141 int state;
142 atomic_t refcount;
143 struct list_head running; /* running cmd list */
144 void *dd_data; /* driver/transport data */
145};
146
147static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
148{
149 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
150}
151
152static inline void* iscsi_next_hdr(struct iscsi_task *task)
153{
154 return (void*)task->hdr + task->hdr_len;
155}
156
157/* Connection's states */
158enum {
159 ISCSI_CONN_INITIAL_STAGE,
160 ISCSI_CONN_STARTED,
161 ISCSI_CONN_STOPPED,
162 ISCSI_CONN_CLEANUP_WAIT,
163};
164
165struct iscsi_conn {
166 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
167 void *dd_data; /* iscsi_transport data */
168 struct iscsi_session *session; /* parent session */
169 /*
170 * conn_stop() flag: stop to recover, stop to terminate
171 */
172 int stop_stage;
173 struct timer_list transport_timer;
174 unsigned long last_recv;
175 unsigned long last_ping;
176 int ping_timeout;
177 int recv_timeout;
178 struct iscsi_task *ping_task;
179
180 /* iSCSI connection-wide sequencing */
181 uint32_t exp_statsn;
182 uint32_t statsn;
183
184 /* control data */
185 int id; /* CID */
186 int c_stage; /* connection state */
187 /*
188 * Preallocated buffer for pdus that have data but do not
189 * originate from scsi-ml. We never have two pdus using the
190 * buffer at the same time. It is only allocated to
191 * the default max recv size because the pdus we support
192 * should always fit in this buffer
193 */
194 char *data;
195 struct iscsi_task *login_task; /* mtask used for login/text */
196 struct iscsi_task *task; /* xmit task in progress */
197
198 /* xmit */
199 spinlock_t taskqueuelock; /* protects the next three lists */
200 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
201 struct list_head cmdqueue; /* data-path cmd queue */
202 struct list_head requeue; /* tasks needing another run */
203 struct work_struct xmitwork; /* per-conn. xmit workqueue */
204 unsigned long suspend_tx; /* suspend Tx */
205 unsigned long suspend_rx; /* suspend Rx */
206
207 /* abort */
208 wait_queue_head_t ehwait; /* used in eh_abort() */
209 struct iscsi_tm tmhdr;
210 struct timer_list tmf_timer;
211 int tmf_state; /* see TMF_INITIAL, etc.*/
212
213 /* negotiated params */
214 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
215 unsigned max_xmit_dlength; /* target_max_recv_dsl */
216 int hdrdgst_en;
217 int datadgst_en;
218 int ifmarker_en;
219 int ofmarker_en;
220 /* values userspace uses to id a conn */
221 int persistent_port;
222 char *persistent_address;
223
224 unsigned max_segment_size;
225 unsigned tcp_xmit_wsf;
226 unsigned tcp_recv_wsf;
227 uint16_t keepalive_tmo;
228 uint16_t local_port;
229 uint8_t tcp_timestamp_stat;
230 uint8_t tcp_nagle_disable;
231 uint8_t tcp_wsf_disable;
232 uint8_t tcp_timer_scale;
233 uint8_t tcp_timestamp_en;
234 uint8_t fragment_disable;
235 uint8_t ipv4_tos;
236 uint8_t ipv6_traffic_class;
237 uint8_t ipv6_flow_label;
238 uint8_t is_fw_assigned_ipv6;
239 char *local_ipaddr;
240
241 /* MIB-statistics */
242 uint64_t txdata_octets;
243 uint64_t rxdata_octets;
244 uint32_t scsicmd_pdus_cnt;
245 uint32_t dataout_pdus_cnt;
246 uint32_t scsirsp_pdus_cnt;
247 uint32_t datain_pdus_cnt;
248 uint32_t r2t_pdus_cnt;
249 uint32_t tmfcmd_pdus_cnt;
250 int32_t tmfrsp_pdus_cnt;
251
252 /* custom statistics */
253 uint32_t eh_abort_cnt;
254 uint32_t fmr_unalign_cnt;
255};
256
257struct iscsi_pool {
258 struct kfifo queue; /* FIFO Queue */
259 void **pool; /* Pool of elements */
260 int max; /* Max number of elements */
261};
262
263/* Session's states */
264enum {
265 ISCSI_STATE_FREE = 1,
266 ISCSI_STATE_LOGGED_IN,
267 ISCSI_STATE_FAILED,
268 ISCSI_STATE_TERMINATE,
269 ISCSI_STATE_IN_RECOVERY,
270 ISCSI_STATE_RECOVERY_FAILED,
271 ISCSI_STATE_LOGGING_OUT,
272};
273
274struct iscsi_session {
275 struct iscsi_cls_session *cls_session;
276 /*
277 * Syncs up the scsi eh thread with the iscsi eh thread when sending
278 * task management functions. This must be taken before the session
279 * and recv lock.
280 */
281 struct mutex eh_mutex;
282
283 /* iSCSI session-wide sequencing */
284 uint32_t cmdsn;
285 uint32_t exp_cmdsn;
286 uint32_t max_cmdsn;
287
288 /* This tracks the reqs queued into the initiator */
289 uint32_t queued_cmdsn;
290
291 /* configuration */
292 int abort_timeout;
293 int lu_reset_timeout;
294 int tgt_reset_timeout;
295 int initial_r2t_en;
296 unsigned short max_r2t;
297 int imm_data_en;
298 unsigned first_burst;
299 unsigned max_burst;
300 int time2wait;
301 int time2retain;
302 int pdu_inorder_en;
303 int dataseq_inorder_en;
304 int erl;
305 int fast_abort;
306 int tpgt;
307 char *username;
308 char *username_in;
309 char *password;
310 char *password_in;
311 char *targetname;
312 char *targetalias;
313 char *ifacename;
314 char *initiatorname;
315 char *boot_root;
316 char *boot_nic;
317 char *boot_target;
318 char *portal_type;
319 char *discovery_parent_type;
320 uint16_t discovery_parent_idx;
321 uint16_t def_taskmgmt_tmo;
322 uint16_t tsid;
323 uint8_t auto_snd_tgt_disable;
324 uint8_t discovery_sess;
325 uint8_t chap_auth_en;
326 uint8_t discovery_logout_en;
327 uint8_t bidi_chap_en;
328 uint8_t discovery_auth_optional;
329 uint8_t isid[ISID_SIZE];
330
331 /* control data */
332 struct iscsi_transport *tt;
333 struct Scsi_Host *host;
334 struct iscsi_conn *leadconn; /* leading connection */
335 /* Between the forward and the backward locks exists a strict locking
336 * hierarchy. The mutual exclusion zone protected by the forward lock
337 * can enclose the mutual exclusion zone protected by the backward lock
338 * but not vice versa.
339 */
340 spinlock_t frwd_lock; /* protects session state, *
341 * cmdsn, queued_cmdsn *
342 * session resources: *
343 * - cmdpool kfifo_out , *
344 * - mgmtpool, */
345 spinlock_t back_lock; /* protects cmdsn_exp *
346 * cmdsn_max, *
347 * cmdpool kfifo_in */
348 int state; /* session state */
349 int age; /* counts session re-opens */
350
351 int scsi_cmds_max; /* max scsi commands */
352 int cmds_max; /* size of cmds array */
353 struct iscsi_task **cmds; /* Original Cmds arr */
354 struct iscsi_pool cmdpool; /* PDU's pool */
355 void *dd_data; /* LLD private data */
356};
357
358enum {
359 ISCSI_HOST_SETUP,
360 ISCSI_HOST_REMOVED,
361};
362
363struct iscsi_host {
364 char *initiatorname;
365 /* hw address or netdev iscsi connection is bound to */
366 char *hwaddress;
367 char *netdev;
368
369 wait_queue_head_t session_removal_wq;
370 /* protects sessions and state */
371 spinlock_t lock;
372 int num_sessions;
373 int state;
374
375 struct workqueue_struct *workq;
376 char workq_name[20];
377};
378
379/*
380 * scsi host template
381 */
382extern int iscsi_eh_abort(struct scsi_cmnd *sc);
383extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
384extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
385extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
386extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
387
388/*
389 * iSCSI host helpers.
390 */
391#define iscsi_host_priv(_shost) \
392 (shost_priv(_shost) + sizeof(struct iscsi_host))
393
394extern int iscsi_host_set_param(struct Scsi_Host *shost,
395 enum iscsi_host_param param, char *buf,
396 int buflen);
397extern int iscsi_host_get_param(struct Scsi_Host *shost,
398 enum iscsi_host_param param, char *buf);
399extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
400extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
401 int dd_data_size,
402 bool xmit_can_sleep);
403extern void iscsi_host_remove(struct Scsi_Host *shost);
404extern void iscsi_host_free(struct Scsi_Host *shost);
405extern int iscsi_target_alloc(struct scsi_target *starget);
406
407/*
408 * session management
409 */
410extern struct iscsi_cls_session *
411iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
412 uint16_t, int, int, uint32_t, unsigned int);
413extern void iscsi_session_teardown(struct iscsi_cls_session *);
414extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
415extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
416 enum iscsi_param param, char *buf, int buflen);
417extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
418 enum iscsi_param param, char *buf);
419
420#define iscsi_session_printk(prefix, _sess, fmt, a...) \
421 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
422
423/*
424 * connection management
425 */
426extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
427 int, uint32_t);
428extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
429extern int iscsi_conn_start(struct iscsi_cls_conn *);
430extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
431extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
432 int);
433extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
434extern void iscsi_session_failure(struct iscsi_session *session,
435 enum iscsi_err err);
436extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
437 enum iscsi_param param, char *buf);
438extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
439 enum iscsi_param param, char *buf);
440extern void iscsi_suspend_tx(struct iscsi_conn *conn);
441extern void iscsi_suspend_queue(struct iscsi_conn *conn);
442extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
443
444#define iscsi_conn_printk(prefix, _c, fmt, a...) \
445 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
446 fmt, ##a)
447
448/*
449 * pdu and task processing
450 */
451extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
452extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
453 struct iscsi_r2t_info *r2t,
454 struct iscsi_data *hdr);
455extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
456 char *, uint32_t);
457extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
458 char *, int);
459extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
460 char *, int);
461extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
462extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
463extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
464extern void iscsi_requeue_task(struct iscsi_task *task);
465extern void iscsi_put_task(struct iscsi_task *task);
466extern void __iscsi_put_task(struct iscsi_task *task);
467extern void __iscsi_get_task(struct iscsi_task *task);
468extern void iscsi_complete_scsi_task(struct iscsi_task *task,
469 uint32_t exp_cmdsn, uint32_t max_cmdsn);
470
471/*
472 * generic helpers
473 */
474extern void iscsi_pool_free(struct iscsi_pool *);
475extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
476extern int iscsi_switch_str_param(char **, char *);
477
478/*
479 * inline functions to deal with padding.
480 */
481static inline unsigned int
482iscsi_padded(unsigned int len)
483{
484 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
485}
486
487static inline unsigned int
488iscsi_padding(unsigned int len)
489{
490 len &= (ISCSI_PAD_LEN - 1);
491 if (len)
492 len = ISCSI_PAD_LEN - len;
493 return len;
494}
495
496#endif