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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * iSCSI lib definitions
4 *
5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2004 - 2006 Mike Christie
7 * Copyright (C) 2004 - 2005 Dmitry Yusupov
8 * Copyright (C) 2004 - 2005 Alex Aizman
9 */
10#ifndef LIBISCSI_H
11#define LIBISCSI_H
12
13#include <linux/types.h>
14#include <linux/wait.h>
15#include <linux/mutex.h>
16#include <linux/timer.h>
17#include <linux/workqueue.h>
18#include <linux/kfifo.h>
19#include <linux/refcount.h>
20#include <scsi/iscsi_proto.h>
21#include <scsi/iscsi_if.h>
22#include <scsi/scsi_cmnd.h>
23#include <scsi/scsi_transport_iscsi.h>
24
25struct scsi_transport_template;
26struct scsi_host_template;
27struct scsi_device;
28struct Scsi_Host;
29struct scsi_target;
30struct scsi_cmnd;
31struct socket;
32struct iscsi_transport;
33struct iscsi_cls_session;
34struct iscsi_cls_conn;
35struct iscsi_session;
36struct iscsi_nopin;
37struct device;
38
39#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
40#define ISCSI_MGMT_CMDS_MAX 15
41
42#define ISCSI_DEF_CMD_PER_LUN 32
43
44/* Task Mgmt states */
45enum {
46 TMF_INITIAL,
47 TMF_QUEUED,
48 TMF_SUCCESS,
49 TMF_FAILED,
50 TMF_TIMEDOUT,
51 TMF_NOT_FOUND,
52};
53
54#define ISID_SIZE 6
55
56/* Connection flags */
57#define ISCSI_CONN_FLAG_SUSPEND_TX 0
58#define ISCSI_CONN_FLAG_SUSPEND_RX 1
59#define ISCSI_CONN_FLAG_BOUND 2
60
61#define ISCSI_ITT_MASK 0x1fff
62#define ISCSI_TOTAL_CMDS_MAX 4096
63/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
64#define ISCSI_TOTAL_CMDS_MIN 16
65#define ISCSI_AGE_SHIFT 28
66#define ISCSI_AGE_MASK 0xf
67
68#define ISCSI_ADDRESS_BUF_LEN 64
69
70enum {
71 /* this is the maximum possible storage for AHSs */
72 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
73 sizeof(struct iscsi_rlength_ahdr),
74 ISCSI_DIGEST_SIZE = sizeof(__u32),
75};
76
77
78enum {
79 ISCSI_TASK_FREE,
80 ISCSI_TASK_COMPLETED,
81 ISCSI_TASK_PENDING,
82 ISCSI_TASK_RUNNING,
83 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
84 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
85 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
86};
87
88struct iscsi_r2t_info {
89 __be32 ttt; /* copied from R2T */
90 __be32 exp_statsn; /* copied from R2T */
91 uint32_t data_length; /* copied from R2T */
92 uint32_t data_offset; /* copied from R2T */
93 int data_count; /* DATA-Out payload progress */
94 int datasn;
95 /* LLDs should set/update these values */
96 int sent; /* R2T sequence progress */
97};
98
99struct iscsi_task {
100 /*
101 * Because LLDs allocate their hdr differently, this is a pointer
102 * and length to that storage. It must be setup at session
103 * creation time.
104 */
105 struct iscsi_hdr *hdr;
106 unsigned short hdr_max;
107 unsigned short hdr_len; /* accumulated size of hdr used */
108 /* copied values in case we need to send tmfs */
109 itt_t hdr_itt;
110 __be32 cmdsn;
111 struct scsi_lun lun;
112
113 int itt; /* this ITT */
114
115 unsigned imm_count; /* imm-data (bytes) */
116 /* offset in unsolicited stream (bytes); */
117 struct iscsi_r2t_info unsol_r2t;
118 char *data; /* mgmt payload */
119 unsigned data_count;
120 struct scsi_cmnd *sc; /* associated SCSI cmd*/
121 struct iscsi_conn *conn; /* used connection */
122
123 /* data processing tracking */
124 unsigned long last_xfer;
125 unsigned long last_timeout;
126 bool have_checked_conn;
127
128 /* T10 protection information */
129 bool protected;
130
131 /* state set/tested under session->lock */
132 int state;
133 refcount_t refcount;
134 struct list_head running; /* running cmd list */
135 void *dd_data; /* driver/transport data */
136};
137
138static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
139{
140 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
141}
142
143static inline void* iscsi_next_hdr(struct iscsi_task *task)
144{
145 return (void*)task->hdr + task->hdr_len;
146}
147
148static inline bool iscsi_task_is_completed(struct iscsi_task *task)
149{
150 return task->state == ISCSI_TASK_COMPLETED ||
151 task->state == ISCSI_TASK_ABRT_TMF ||
152 task->state == ISCSI_TASK_ABRT_SESS_RECOV;
153}
154
155/* Private data associated with struct scsi_cmnd. */
156struct iscsi_cmd {
157 struct iscsi_task *task;
158 int age;
159};
160
161static inline struct iscsi_cmd *iscsi_cmd(struct scsi_cmnd *cmd)
162{
163 return scsi_cmd_priv(cmd);
164}
165
166/* Connection's states */
167enum {
168 ISCSI_CONN_INITIAL_STAGE,
169 ISCSI_CONN_STARTED,
170 ISCSI_CONN_STOPPED,
171 ISCSI_CONN_CLEANUP_WAIT,
172};
173
174struct iscsi_conn {
175 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
176 void *dd_data; /* iscsi_transport data */
177 struct iscsi_session *session; /* parent session */
178 /*
179 * conn_stop() flag: stop to recover, stop to terminate
180 */
181 int stop_stage;
182 struct timer_list transport_timer;
183 unsigned long last_recv;
184 unsigned long last_ping;
185 int ping_timeout;
186 int recv_timeout;
187 struct iscsi_task *ping_task;
188
189 /* iSCSI connection-wide sequencing */
190 uint32_t exp_statsn;
191 uint32_t statsn;
192
193 /* control data */
194 int id; /* CID */
195 int c_stage; /* connection state */
196 /*
197 * Preallocated buffer for pdus that have data but do not
198 * originate from scsi-ml. We never have two pdus using the
199 * buffer at the same time. It is only allocated to
200 * the default max recv size because the pdus we support
201 * should always fit in this buffer
202 */
203 char *data;
204 struct iscsi_task *login_task; /* mtask used for login/text */
205 struct iscsi_task *task; /* xmit task in progress */
206
207 /* xmit */
208 /* items must be added/deleted under frwd lock */
209 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
210 struct list_head cmdqueue; /* data-path cmd queue */
211 struct list_head requeue; /* tasks needing another run */
212 struct work_struct xmitwork; /* per-conn. xmit workqueue */
213 /* recv */
214 struct work_struct recvwork;
215 unsigned long flags; /* ISCSI_CONN_FLAGs */
216
217 /* negotiated params */
218 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
219 unsigned max_xmit_dlength; /* target_max_recv_dsl */
220 int hdrdgst_en;
221 int datadgst_en;
222 int ifmarker_en;
223 int ofmarker_en;
224 /* values userspace uses to id a conn */
225 int persistent_port;
226 char *persistent_address;
227
228 unsigned max_segment_size;
229 unsigned tcp_xmit_wsf;
230 unsigned tcp_recv_wsf;
231 uint16_t keepalive_tmo;
232 uint16_t local_port;
233 uint8_t tcp_timestamp_stat;
234 uint8_t tcp_nagle_disable;
235 uint8_t tcp_wsf_disable;
236 uint8_t tcp_timer_scale;
237 uint8_t tcp_timestamp_en;
238 uint8_t fragment_disable;
239 uint8_t ipv4_tos;
240 uint8_t ipv6_traffic_class;
241 uint8_t ipv6_flow_label;
242 uint8_t is_fw_assigned_ipv6;
243 char *local_ipaddr;
244
245 /* MIB-statistics */
246 uint64_t txdata_octets;
247 uint64_t rxdata_octets;
248 uint32_t scsicmd_pdus_cnt;
249 uint32_t dataout_pdus_cnt;
250 uint32_t scsirsp_pdus_cnt;
251 uint32_t datain_pdus_cnt;
252 uint32_t r2t_pdus_cnt;
253 uint32_t tmfcmd_pdus_cnt;
254 int32_t tmfrsp_pdus_cnt;
255
256 /* custom statistics */
257 uint32_t eh_abort_cnt;
258 uint32_t fmr_unalign_cnt;
259};
260
261struct iscsi_pool {
262 struct kfifo queue; /* FIFO Queue */
263 void **pool; /* Pool of elements */
264 int max; /* Max number of elements */
265};
266
267/* Session's states */
268enum {
269 ISCSI_STATE_FREE = 1,
270 ISCSI_STATE_LOGGED_IN,
271 ISCSI_STATE_FAILED,
272 ISCSI_STATE_TERMINATE,
273 ISCSI_STATE_IN_RECOVERY,
274 ISCSI_STATE_RECOVERY_FAILED,
275 ISCSI_STATE_LOGGING_OUT,
276};
277
278struct iscsi_session {
279 struct iscsi_cls_session *cls_session;
280 /*
281 * Syncs up the scsi eh thread with the iscsi eh thread when sending
282 * task management functions. This must be taken before the session
283 * and recv lock.
284 */
285 struct mutex eh_mutex;
286 /* abort */
287 wait_queue_head_t ehwait; /* used in eh_abort() */
288 struct iscsi_tm tmhdr;
289 struct timer_list tmf_timer;
290 int tmf_state; /* see TMF_INITIAL, etc.*/
291 struct iscsi_task *running_aborted_task;
292
293 /* iSCSI session-wide sequencing */
294 uint32_t cmdsn;
295 uint32_t exp_cmdsn;
296 uint32_t max_cmdsn;
297
298 /* This tracks the reqs queued into the initiator */
299 uint32_t queued_cmdsn;
300
301 /* configuration */
302 int abort_timeout;
303 int lu_reset_timeout;
304 int tgt_reset_timeout;
305 int initial_r2t_en;
306 unsigned short max_r2t;
307 int imm_data_en;
308 unsigned first_burst;
309 unsigned max_burst;
310 int time2wait;
311 int time2retain;
312 int pdu_inorder_en;
313 int dataseq_inorder_en;
314 int erl;
315 int fast_abort;
316 int tpgt;
317 char *username;
318 char *username_in;
319 char *password;
320 char *password_in;
321 char *targetname;
322 char *targetalias;
323 char *ifacename;
324 char *initiatorname;
325 char *boot_root;
326 char *boot_nic;
327 char *boot_target;
328 char *portal_type;
329 char *discovery_parent_type;
330 uint16_t discovery_parent_idx;
331 uint16_t def_taskmgmt_tmo;
332 uint16_t tsid;
333 uint8_t auto_snd_tgt_disable;
334 uint8_t discovery_sess;
335 uint8_t chap_auth_en;
336 uint8_t discovery_logout_en;
337 uint8_t bidi_chap_en;
338 uint8_t discovery_auth_optional;
339 uint8_t isid[ISID_SIZE];
340
341 /* control data */
342 struct iscsi_transport *tt;
343 struct Scsi_Host *host;
344 struct iscsi_conn *leadconn; /* leading connection */
345 /* Between the forward and the backward locks exists a strict locking
346 * hierarchy. The mutual exclusion zone protected by the forward lock
347 * can enclose the mutual exclusion zone protected by the backward lock
348 * but not vice versa.
349 */
350 spinlock_t frwd_lock; /* protects session state, *
351 * cmdsn, queued_cmdsn *
352 * session resources: *
353 * - cmdpool kfifo_out , *
354 * - mgmtpool, queues */
355 spinlock_t back_lock; /* protects cmdsn_exp *
356 * cmdsn_max, *
357 * cmdpool kfifo_in */
358 int state; /* session state */
359 int age; /* counts session re-opens */
360
361 int scsi_cmds_max; /* max scsi commands */
362 int cmds_max; /* size of cmds array */
363 struct iscsi_task **cmds; /* Original Cmds arr */
364 struct iscsi_pool cmdpool; /* PDU's pool */
365 void *dd_data; /* LLD private data */
366};
367
368enum {
369 ISCSI_HOST_SETUP,
370 ISCSI_HOST_REMOVED,
371};
372
373struct iscsi_host {
374 char *initiatorname;
375 /* hw address or netdev iscsi connection is bound to */
376 char *hwaddress;
377 char *netdev;
378
379 wait_queue_head_t session_removal_wq;
380 /* protects sessions and state */
381 spinlock_t lock;
382 int num_sessions;
383 int state;
384
385 struct workqueue_struct *workq;
386};
387
388/*
389 * scsi host template
390 */
391extern int iscsi_eh_abort(struct scsi_cmnd *sc);
392extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
393extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
394extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
395extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
396extern enum scsi_timeout_action iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc);
397
398/*
399 * iSCSI host helpers.
400 */
401#define iscsi_host_priv(_shost) \
402 (shost_priv(_shost) + sizeof(struct iscsi_host))
403
404extern int iscsi_host_set_param(struct Scsi_Host *shost,
405 enum iscsi_host_param param, char *buf,
406 int buflen);
407extern int iscsi_host_get_param(struct Scsi_Host *shost,
408 enum iscsi_host_param param, char *buf);
409extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
410extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
411 int dd_data_size,
412 bool xmit_can_sleep);
413extern void iscsi_host_remove(struct Scsi_Host *shost, bool is_shutdown);
414extern void iscsi_host_free(struct Scsi_Host *shost);
415extern int iscsi_target_alloc(struct scsi_target *starget);
416extern int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost,
417 uint16_t requested_cmds_max);
418
419/*
420 * session management
421 */
422extern struct iscsi_cls_session *
423iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
424 uint16_t, int, int, uint32_t, unsigned int);
425void iscsi_session_remove(struct iscsi_cls_session *cls_session);
426void iscsi_session_free(struct iscsi_cls_session *cls_session);
427extern void iscsi_session_teardown(struct iscsi_cls_session *);
428extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
429extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
430 enum iscsi_param param, char *buf, int buflen);
431extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
432 enum iscsi_param param, char *buf);
433
434#define iscsi_session_printk(prefix, _sess, fmt, a...) \
435 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
436
437/*
438 * connection management
439 */
440extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
441 int, uint32_t);
442extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
443extern int iscsi_conn_start(struct iscsi_cls_conn *);
444extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
445extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
446 int);
447extern void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active);
448extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
449extern void iscsi_session_failure(struct iscsi_session *session,
450 enum iscsi_err err);
451extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
452 enum iscsi_param param, char *buf);
453extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
454 enum iscsi_param param, char *buf);
455extern void iscsi_suspend_tx(struct iscsi_conn *conn);
456extern void iscsi_suspend_rx(struct iscsi_conn *conn);
457extern void iscsi_suspend_queue(struct iscsi_conn *conn);
458extern void iscsi_conn_queue_xmit(struct iscsi_conn *conn);
459extern void iscsi_conn_queue_recv(struct iscsi_conn *conn);
460
461#define iscsi_conn_printk(prefix, _c, fmt, a...) \
462 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
463 fmt, ##a)
464
465/*
466 * pdu and task processing
467 */
468extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
469extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
470 struct iscsi_r2t_info *r2t,
471 struct iscsi_data *hdr);
472extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
473 char *, uint32_t);
474extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
475 char *, int);
476extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
477 char *, int);
478extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
479extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
480extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
481extern void iscsi_requeue_task(struct iscsi_task *task);
482extern void iscsi_put_task(struct iscsi_task *task);
483extern void __iscsi_put_task(struct iscsi_task *task);
484extern bool iscsi_get_task(struct iscsi_task *task);
485extern void iscsi_complete_scsi_task(struct iscsi_task *task,
486 uint32_t exp_cmdsn, uint32_t max_cmdsn);
487
488/*
489 * generic helpers
490 */
491extern void iscsi_pool_free(struct iscsi_pool *);
492extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
493extern int iscsi_switch_str_param(char **, char *);
494
495/*
496 * inline functions to deal with padding.
497 */
498static inline unsigned int
499iscsi_padded(unsigned int len)
500{
501 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
502}
503
504static inline unsigned int
505iscsi_padding(unsigned int len)
506{
507 len &= (ISCSI_PAD_LEN - 1);
508 if (len)
509 len = ISCSI_PAD_LEN - len;
510 return len;
511}
512
513#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 <linux/refcount.h>
33#include <scsi/iscsi_proto.h>
34#include <scsi/iscsi_if.h>
35#include <scsi/scsi_transport_iscsi.h>
36
37struct scsi_transport_template;
38struct scsi_host_template;
39struct scsi_device;
40struct Scsi_Host;
41struct scsi_target;
42struct scsi_cmnd;
43struct socket;
44struct iscsi_transport;
45struct iscsi_cls_session;
46struct iscsi_cls_conn;
47struct iscsi_session;
48struct iscsi_nopin;
49struct device;
50
51#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
52#define ISCSI_MGMT_CMDS_MAX 15
53
54#define ISCSI_DEF_CMD_PER_LUN 32
55
56/* Task Mgmt states */
57enum {
58 TMF_INITIAL,
59 TMF_QUEUED,
60 TMF_SUCCESS,
61 TMF_FAILED,
62 TMF_TIMEDOUT,
63 TMF_NOT_FOUND,
64};
65
66#define ISID_SIZE 6
67
68/* Connection suspend "bit" */
69#define ISCSI_SUSPEND_BIT 1
70
71#define ISCSI_ITT_MASK 0x1fff
72#define ISCSI_TOTAL_CMDS_MAX 4096
73/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
74#define ISCSI_TOTAL_CMDS_MIN 16
75#define ISCSI_AGE_SHIFT 28
76#define ISCSI_AGE_MASK 0xf
77
78#define ISCSI_ADDRESS_BUF_LEN 64
79
80enum {
81 /* this is the maximum possible storage for AHSs */
82 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
83 sizeof(struct iscsi_rlength_ahdr),
84 ISCSI_DIGEST_SIZE = sizeof(__u32),
85};
86
87
88enum {
89 ISCSI_TASK_FREE,
90 ISCSI_TASK_COMPLETED,
91 ISCSI_TASK_PENDING,
92 ISCSI_TASK_RUNNING,
93 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
94 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
95 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
96};
97
98struct iscsi_r2t_info {
99 __be32 ttt; /* copied from R2T */
100 __be32 exp_statsn; /* copied from R2T */
101 uint32_t data_length; /* copied from R2T */
102 uint32_t data_offset; /* copied from R2T */
103 int data_count; /* DATA-Out payload progress */
104 int datasn;
105 /* LLDs should set/update these values */
106 int sent; /* R2T sequence progress */
107};
108
109struct iscsi_task {
110 /*
111 * Because LLDs allocate their hdr differently, this is a pointer
112 * and length to that storage. It must be setup at session
113 * creation time.
114 */
115 struct iscsi_hdr *hdr;
116 unsigned short hdr_max;
117 unsigned short hdr_len; /* accumulated size of hdr used */
118 /* copied values in case we need to send tmfs */
119 itt_t hdr_itt;
120 __be32 cmdsn;
121 struct scsi_lun lun;
122
123 int itt; /* this ITT */
124
125 unsigned imm_count; /* imm-data (bytes) */
126 /* offset in unsolicited stream (bytes); */
127 struct iscsi_r2t_info unsol_r2t;
128 char *data; /* mgmt payload */
129 unsigned data_count;
130 struct scsi_cmnd *sc; /* associated SCSI cmd*/
131 struct iscsi_conn *conn; /* used connection */
132
133 /* data processing tracking */
134 unsigned long last_xfer;
135 unsigned long last_timeout;
136 bool have_checked_conn;
137
138 /* T10 protection information */
139 bool protected;
140
141 /* state set/tested under session->lock */
142 int state;
143 refcount_t refcount;
144 struct list_head running; /* running cmd list */
145 void *dd_data; /* driver/transport data */
146};
147
148static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
149{
150 return task->unsol_r2t.data_length > task->unsol_r2t.sent;
151}
152
153static inline void* iscsi_next_hdr(struct iscsi_task *task)
154{
155 return (void*)task->hdr + task->hdr_len;
156}
157
158/* Connection's states */
159enum {
160 ISCSI_CONN_INITIAL_STAGE,
161 ISCSI_CONN_STARTED,
162 ISCSI_CONN_STOPPED,
163 ISCSI_CONN_CLEANUP_WAIT,
164};
165
166struct iscsi_conn {
167 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */
168 void *dd_data; /* iscsi_transport data */
169 struct iscsi_session *session; /* parent session */
170 /*
171 * conn_stop() flag: stop to recover, stop to terminate
172 */
173 int stop_stage;
174 struct timer_list transport_timer;
175 unsigned long last_recv;
176 unsigned long last_ping;
177 int ping_timeout;
178 int recv_timeout;
179 struct iscsi_task *ping_task;
180
181 /* iSCSI connection-wide sequencing */
182 uint32_t exp_statsn;
183 uint32_t statsn;
184
185 /* control data */
186 int id; /* CID */
187 int c_stage; /* connection state */
188 /*
189 * Preallocated buffer for pdus that have data but do not
190 * originate from scsi-ml. We never have two pdus using the
191 * buffer at the same time. It is only allocated to
192 * the default max recv size because the pdus we support
193 * should always fit in this buffer
194 */
195 char *data;
196 struct iscsi_task *login_task; /* mtask used for login/text */
197 struct iscsi_task *task; /* xmit task in progress */
198
199 /* xmit */
200 spinlock_t taskqueuelock; /* protects the next three lists */
201 struct list_head mgmtqueue; /* mgmt (control) xmit queue */
202 struct list_head cmdqueue; /* data-path cmd queue */
203 struct list_head requeue; /* tasks needing another run */
204 struct work_struct xmitwork; /* per-conn. xmit workqueue */
205 unsigned long suspend_tx; /* suspend Tx */
206 unsigned long suspend_rx; /* suspend Rx */
207
208 /* abort */
209 wait_queue_head_t ehwait; /* used in eh_abort() */
210 struct iscsi_tm tmhdr;
211 struct timer_list tmf_timer;
212 int tmf_state; /* see TMF_INITIAL, etc.*/
213
214 /* negotiated params */
215 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
216 unsigned max_xmit_dlength; /* target_max_recv_dsl */
217 int hdrdgst_en;
218 int datadgst_en;
219 int ifmarker_en;
220 int ofmarker_en;
221 /* values userspace uses to id a conn */
222 int persistent_port;
223 char *persistent_address;
224
225 unsigned max_segment_size;
226 unsigned tcp_xmit_wsf;
227 unsigned tcp_recv_wsf;
228 uint16_t keepalive_tmo;
229 uint16_t local_port;
230 uint8_t tcp_timestamp_stat;
231 uint8_t tcp_nagle_disable;
232 uint8_t tcp_wsf_disable;
233 uint8_t tcp_timer_scale;
234 uint8_t tcp_timestamp_en;
235 uint8_t fragment_disable;
236 uint8_t ipv4_tos;
237 uint8_t ipv6_traffic_class;
238 uint8_t ipv6_flow_label;
239 uint8_t is_fw_assigned_ipv6;
240 char *local_ipaddr;
241
242 /* MIB-statistics */
243 uint64_t txdata_octets;
244 uint64_t rxdata_octets;
245 uint32_t scsicmd_pdus_cnt;
246 uint32_t dataout_pdus_cnt;
247 uint32_t scsirsp_pdus_cnt;
248 uint32_t datain_pdus_cnt;
249 uint32_t r2t_pdus_cnt;
250 uint32_t tmfcmd_pdus_cnt;
251 int32_t tmfrsp_pdus_cnt;
252
253 /* custom statistics */
254 uint32_t eh_abort_cnt;
255 uint32_t fmr_unalign_cnt;
256};
257
258struct iscsi_pool {
259 struct kfifo queue; /* FIFO Queue */
260 void **pool; /* Pool of elements */
261 int max; /* Max number of elements */
262};
263
264/* Session's states */
265enum {
266 ISCSI_STATE_FREE = 1,
267 ISCSI_STATE_LOGGED_IN,
268 ISCSI_STATE_FAILED,
269 ISCSI_STATE_TERMINATE,
270 ISCSI_STATE_IN_RECOVERY,
271 ISCSI_STATE_RECOVERY_FAILED,
272 ISCSI_STATE_LOGGING_OUT,
273};
274
275struct iscsi_session {
276 struct iscsi_cls_session *cls_session;
277 /*
278 * Syncs up the scsi eh thread with the iscsi eh thread when sending
279 * task management functions. This must be taken before the session
280 * and recv lock.
281 */
282 struct mutex eh_mutex;
283
284 /* iSCSI session-wide sequencing */
285 uint32_t cmdsn;
286 uint32_t exp_cmdsn;
287 uint32_t max_cmdsn;
288
289 /* This tracks the reqs queued into the initiator */
290 uint32_t queued_cmdsn;
291
292 /* configuration */
293 int abort_timeout;
294 int lu_reset_timeout;
295 int tgt_reset_timeout;
296 int initial_r2t_en;
297 unsigned short max_r2t;
298 int imm_data_en;
299 unsigned first_burst;
300 unsigned max_burst;
301 int time2wait;
302 int time2retain;
303 int pdu_inorder_en;
304 int dataseq_inorder_en;
305 int erl;
306 int fast_abort;
307 int tpgt;
308 char *username;
309 char *username_in;
310 char *password;
311 char *password_in;
312 char *targetname;
313 char *targetalias;
314 char *ifacename;
315 char *initiatorname;
316 char *boot_root;
317 char *boot_nic;
318 char *boot_target;
319 char *portal_type;
320 char *discovery_parent_type;
321 uint16_t discovery_parent_idx;
322 uint16_t def_taskmgmt_tmo;
323 uint16_t tsid;
324 uint8_t auto_snd_tgt_disable;
325 uint8_t discovery_sess;
326 uint8_t chap_auth_en;
327 uint8_t discovery_logout_en;
328 uint8_t bidi_chap_en;
329 uint8_t discovery_auth_optional;
330 uint8_t isid[ISID_SIZE];
331
332 /* control data */
333 struct iscsi_transport *tt;
334 struct Scsi_Host *host;
335 struct iscsi_conn *leadconn; /* leading connection */
336 /* Between the forward and the backward locks exists a strict locking
337 * hierarchy. The mutual exclusion zone protected by the forward lock
338 * can enclose the mutual exclusion zone protected by the backward lock
339 * but not vice versa.
340 */
341 spinlock_t frwd_lock; /* protects session state, *
342 * cmdsn, queued_cmdsn *
343 * session resources: *
344 * - cmdpool kfifo_out , *
345 * - mgmtpool, */
346 spinlock_t back_lock; /* protects cmdsn_exp *
347 * cmdsn_max, *
348 * cmdpool kfifo_in */
349 int state; /* session state */
350 int age; /* counts session re-opens */
351
352 int scsi_cmds_max; /* max scsi commands */
353 int cmds_max; /* size of cmds array */
354 struct iscsi_task **cmds; /* Original Cmds arr */
355 struct iscsi_pool cmdpool; /* PDU's pool */
356 void *dd_data; /* LLD private data */
357};
358
359enum {
360 ISCSI_HOST_SETUP,
361 ISCSI_HOST_REMOVED,
362};
363
364struct iscsi_host {
365 char *initiatorname;
366 /* hw address or netdev iscsi connection is bound to */
367 char *hwaddress;
368 char *netdev;
369
370 wait_queue_head_t session_removal_wq;
371 /* protects sessions and state */
372 spinlock_t lock;
373 int num_sessions;
374 int state;
375
376 struct workqueue_struct *workq;
377 char workq_name[20];
378};
379
380/*
381 * scsi host template
382 */
383extern int iscsi_eh_abort(struct scsi_cmnd *sc);
384extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
385extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
386extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
387extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
388extern enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc);
389
390/*
391 * iSCSI host helpers.
392 */
393#define iscsi_host_priv(_shost) \
394 (shost_priv(_shost) + sizeof(struct iscsi_host))
395
396extern int iscsi_host_set_param(struct Scsi_Host *shost,
397 enum iscsi_host_param param, char *buf,
398 int buflen);
399extern int iscsi_host_get_param(struct Scsi_Host *shost,
400 enum iscsi_host_param param, char *buf);
401extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
402extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
403 int dd_data_size,
404 bool xmit_can_sleep);
405extern void iscsi_host_remove(struct Scsi_Host *shost);
406extern void iscsi_host_free(struct Scsi_Host *shost);
407extern int iscsi_target_alloc(struct scsi_target *starget);
408
409/*
410 * session management
411 */
412extern struct iscsi_cls_session *
413iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
414 uint16_t, int, int, uint32_t, unsigned int);
415extern void iscsi_session_teardown(struct iscsi_cls_session *);
416extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
417extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
418 enum iscsi_param param, char *buf, int buflen);
419extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
420 enum iscsi_param param, char *buf);
421
422#define iscsi_session_printk(prefix, _sess, fmt, a...) \
423 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
424
425/*
426 * connection management
427 */
428extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
429 int, uint32_t);
430extern void iscsi_conn_teardown(struct iscsi_cls_conn *);
431extern int iscsi_conn_start(struct iscsi_cls_conn *);
432extern void iscsi_conn_stop(struct iscsi_cls_conn *, int);
433extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
434 int);
435extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err);
436extern void iscsi_session_failure(struct iscsi_session *session,
437 enum iscsi_err err);
438extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
439 enum iscsi_param param, char *buf);
440extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
441 enum iscsi_param param, char *buf);
442extern void iscsi_suspend_tx(struct iscsi_conn *conn);
443extern void iscsi_suspend_queue(struct iscsi_conn *conn);
444extern void iscsi_conn_queue_work(struct iscsi_conn *conn);
445
446#define iscsi_conn_printk(prefix, _c, fmt, a...) \
447 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
448 fmt, ##a)
449
450/*
451 * pdu and task processing
452 */
453extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
454extern void iscsi_prep_data_out_pdu(struct iscsi_task *task,
455 struct iscsi_r2t_info *r2t,
456 struct iscsi_data *hdr);
457extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *,
458 char *, uint32_t);
459extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
460 char *, int);
461extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *,
462 char *, int);
463extern int iscsi_verify_itt(struct iscsi_conn *, itt_t);
464extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
465extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t);
466extern void iscsi_requeue_task(struct iscsi_task *task);
467extern void iscsi_put_task(struct iscsi_task *task);
468extern void __iscsi_put_task(struct iscsi_task *task);
469extern void __iscsi_get_task(struct iscsi_task *task);
470extern void iscsi_complete_scsi_task(struct iscsi_task *task,
471 uint32_t exp_cmdsn, uint32_t max_cmdsn);
472
473/*
474 * generic helpers
475 */
476extern void iscsi_pool_free(struct iscsi_pool *);
477extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
478extern int iscsi_switch_str_param(char **, char *);
479
480/*
481 * inline functions to deal with padding.
482 */
483static inline unsigned int
484iscsi_padded(unsigned int len)
485{
486 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
487}
488
489static inline unsigned int
490iscsi_padding(unsigned int len)
491{
492 len &= (ISCSI_PAD_LEN - 1);
493 if (len)
494 len = ISCSI_PAD_LEN - len;
495 return len;
496}
497
498#endif