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24#include <linux/types.h>
25#include <linux/kfifo.h>
26#include <linux/delay.h>
27#include <linux/log2.h>
28#include <linux/slab.h>
29#include <linux/module.h>
30#include <asm/unaligned.h>
31#include <net/tcp.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_eh.h>
35#include <scsi/scsi_tcq.h>
36#include <scsi/scsi_host.h>
37#include <scsi/scsi.h>
38#include <scsi/iscsi_proto.h>
39#include <scsi/scsi_transport.h>
40#include <scsi/scsi_transport_iscsi.h>
41#include <scsi/libiscsi.h>
42
43static int iscsi_dbg_lib_conn;
44module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
45 S_IRUGO | S_IWUSR);
46MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
49
50static int iscsi_dbg_lib_session;
51module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
52 S_IRUGO | S_IWUSR);
53MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
56
57static int iscsi_dbg_lib_eh;
58module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
59 S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
63
64#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
65 do { \
66 if (iscsi_dbg_lib_conn) \
67 iscsi_conn_printk(KERN_INFO, _conn, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
72#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
73 do { \
74 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
76 "%s " dbg_fmt, \
77 __func__, ##arg); \
78 } while (0);
79
80#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
81 do { \
82 if (iscsi_dbg_lib_eh) \
83 iscsi_session_printk(KERN_INFO, _session, \
84 "%s " dbg_fmt, \
85 __func__, ##arg); \
86 } while (0);
87
88inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
89{
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
92
93 if (ihost->workq)
94 queue_work(ihost->workq, &conn->xmitwork);
95}
96EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
97
98static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
100{
101
102
103
104
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
106 return;
107
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
110 session->exp_cmdsn = exp_cmdsn;
111
112 if (max_cmdsn != session->max_cmdsn &&
113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
114 session->max_cmdsn = max_cmdsn;
115
116
117
118
119 if (!list_empty(&session->leadconn->cmdqueue) ||
120 !list_empty(&session->leadconn->mgmtqueue))
121 iscsi_conn_queue_work(session->leadconn);
122 }
123}
124
125void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
126{
127 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
128 be32_to_cpu(hdr->max_cmdsn));
129}
130EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
131
132
133
134
135
136
137
138
139
140
141
142
143
144void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
145 struct iscsi_data *hdr)
146{
147 struct iscsi_conn *conn = task->conn;
148 unsigned int left = r2t->data_length - r2t->sent;
149
150 task->hdr_len = sizeof(struct iscsi_data);
151
152 memset(hdr, 0, sizeof(struct iscsi_data));
153 hdr->ttt = r2t->ttt;
154 hdr->datasn = cpu_to_be32(r2t->datasn);
155 r2t->datasn++;
156 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
157 hdr->lun = task->lun;
158 hdr->itt = task->hdr_itt;
159 hdr->exp_statsn = r2t->exp_statsn;
160 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
161 if (left > conn->max_xmit_dlength) {
162 hton24(hdr->dlength, conn->max_xmit_dlength);
163 r2t->data_count = conn->max_xmit_dlength;
164 hdr->flags = 0;
165 } else {
166 hton24(hdr->dlength, left);
167 r2t->data_count = left;
168 hdr->flags = ISCSI_FLAG_CMD_FINAL;
169 }
170 conn->dataout_pdus_cnt++;
171}
172EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
173
174static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
175{
176 unsigned exp_len = task->hdr_len + len;
177
178 if (exp_len > task->hdr_max) {
179 WARN_ON(1);
180 return -EINVAL;
181 }
182
183 WARN_ON(len & (ISCSI_PAD_LEN - 1));
184 task->hdr_len = exp_len;
185 return 0;
186}
187
188
189
190
191static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
192{
193 struct scsi_cmnd *cmd = task->sc;
194 unsigned rlen, pad_len;
195 unsigned short ahslength;
196 struct iscsi_ecdb_ahdr *ecdb_ahdr;
197 int rc;
198
199 ecdb_ahdr = iscsi_next_hdr(task);
200 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
201
202 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
203 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
204
205 pad_len = iscsi_padding(rlen);
206
207 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
208 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
209 if (rc)
210 return rc;
211
212 if (pad_len)
213 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
214
215 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
216 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
217 ecdb_ahdr->reserved = 0;
218 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
219
220 ISCSI_DBG_SESSION(task->conn->session,
221 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
222 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
223 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
224 task->hdr_len);
225 return 0;
226}
227
228static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
229{
230 struct scsi_cmnd *sc = task->sc;
231 struct iscsi_rlength_ahdr *rlen_ahdr;
232 int rc;
233
234 rlen_ahdr = iscsi_next_hdr(task);
235 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
236 if (rc)
237 return rc;
238
239 rlen_ahdr->ahslength =
240 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
241 sizeof(rlen_ahdr->reserved));
242 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
243 rlen_ahdr->reserved = 0;
244 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
245
246 ISCSI_DBG_SESSION(task->conn->session,
247 "bidi-in rlen_ahdr->read_length(%d) "
248 "rlen_ahdr->ahslength(%d)\n",
249 be32_to_cpu(rlen_ahdr->read_length),
250 be16_to_cpu(rlen_ahdr->ahslength));
251 return 0;
252}
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
268{
269 struct iscsi_conn *conn = task->conn;
270 struct iscsi_tm *tmf = &conn->tmhdr;
271 unsigned int hdr_lun;
272
273 if (conn->tmf_state == TMF_INITIAL)
274 return 0;
275
276 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
277 return 0;
278
279 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
280 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
281
282
283
284 hdr_lun = scsilun_to_int(&tmf->lun);
285 if (hdr_lun != task->sc->device->lun)
286 return 0;
287
288 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
289
290
291
292 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
293 iscsi_conn_printk(KERN_INFO, conn,
294 "task [op %x/%x itt "
295 "0x%x/0x%x] "
296 "rejected.\n",
297 task->hdr->opcode, opcode,
298 task->itt, task->hdr_itt);
299 return -EACCES;
300 }
301
302
303
304
305 if (conn->session->fast_abort) {
306 iscsi_conn_printk(KERN_INFO, conn,
307 "task [op %x/%x itt "
308 "0x%x/0x%x] fast abort.\n",
309 task->hdr->opcode, opcode,
310 task->itt, task->hdr_itt);
311 return -EACCES;
312 }
313 break;
314 case ISCSI_TM_FUNC_ABORT_TASK:
315
316
317
318
319
320
321 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
322 task->hdr_itt == tmf->rtt) {
323 ISCSI_DBG_SESSION(conn->session,
324 "Preventing task %x/%x from sending "
325 "data-out due to abort task in "
326 "progress\n", task->itt,
327 task->hdr_itt);
328 return -EACCES;
329 }
330 break;
331 }
332
333 return 0;
334}
335
336
337
338
339
340
341
342
343static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
344{
345 struct iscsi_conn *conn = task->conn;
346 struct iscsi_session *session = conn->session;
347 struct scsi_cmnd *sc = task->sc;
348 struct iscsi_scsi_req *hdr;
349 unsigned hdrlength, cmd_len;
350 itt_t itt;
351 int rc;
352
353 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
354 if (rc)
355 return rc;
356
357 if (conn->session->tt->alloc_pdu) {
358 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
359 if (rc)
360 return rc;
361 }
362 hdr = (struct iscsi_scsi_req *)task->hdr;
363 itt = hdr->itt;
364 memset(hdr, 0, sizeof(*hdr));
365
366 if (session->tt->parse_pdu_itt)
367 hdr->itt = task->hdr_itt = itt;
368 else
369 hdr->itt = task->hdr_itt = build_itt(task->itt,
370 task->conn->session->age);
371 task->hdr_len = 0;
372 rc = iscsi_add_hdr(task, sizeof(*hdr));
373 if (rc)
374 return rc;
375 hdr->opcode = ISCSI_OP_SCSI_CMD;
376 hdr->flags = ISCSI_ATTR_SIMPLE;
377 int_to_scsilun(sc->device->lun, &hdr->lun);
378 task->lun = hdr->lun;
379 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
380 cmd_len = sc->cmd_len;
381 if (cmd_len < ISCSI_CDB_SIZE)
382 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
383 else if (cmd_len > ISCSI_CDB_SIZE) {
384 rc = iscsi_prep_ecdb_ahs(task);
385 if (rc)
386 return rc;
387 cmd_len = ISCSI_CDB_SIZE;
388 }
389 memcpy(hdr->cdb, sc->cmnd, cmd_len);
390
391 task->imm_count = 0;
392 if (scsi_bidi_cmnd(sc)) {
393 hdr->flags |= ISCSI_FLAG_CMD_READ;
394 rc = iscsi_prep_bidi_ahs(task);
395 if (rc)
396 return rc;
397 }
398 if (sc->sc_data_direction == DMA_TO_DEVICE) {
399 unsigned out_len = scsi_out(sc)->length;
400 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
401
402 hdr->data_length = cpu_to_be32(out_len);
403 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418 memset(r2t, 0, sizeof(*r2t));
419
420 if (session->imm_data_en) {
421 if (out_len >= session->first_burst)
422 task->imm_count = min(session->first_burst,
423 conn->max_xmit_dlength);
424 else
425 task->imm_count = min(out_len,
426 conn->max_xmit_dlength);
427 hton24(hdr->dlength, task->imm_count);
428 } else
429 zero_data(hdr->dlength);
430
431 if (!session->initial_r2t_en) {
432 r2t->data_length = min(session->first_burst, out_len) -
433 task->imm_count;
434 r2t->data_offset = task->imm_count;
435 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
436 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
437 }
438
439 if (!task->unsol_r2t.data_length)
440
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 } else {
443 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
444 zero_data(hdr->dlength);
445 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
446
447 if (sc->sc_data_direction == DMA_FROM_DEVICE)
448 hdr->flags |= ISCSI_FLAG_CMD_READ;
449 }
450
451
452 hdrlength = task->hdr_len - sizeof(*hdr);
453
454 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
455 hdrlength /= ISCSI_PAD_LEN;
456
457 WARN_ON(hdrlength >= 256);
458 hdr->hlength = hdrlength & 0xFF;
459 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
460
461 if (session->tt->init_task && session->tt->init_task(task))
462 return -EIO;
463
464 task->state = ISCSI_TASK_RUNNING;
465 session->cmdsn++;
466
467 conn->scsicmd_pdus_cnt++;
468 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
469 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
470 scsi_bidi_cmnd(sc) ? "bidirectional" :
471 sc->sc_data_direction == DMA_TO_DEVICE ?
472 "write" : "read", conn->id, sc, sc->cmnd[0],
473 task->itt, scsi_bufflen(sc),
474 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
475 session->cmdsn,
476 session->max_cmdsn - session->exp_cmdsn + 1);
477 return 0;
478}
479
480
481
482
483
484
485
486
487
488static void iscsi_free_task(struct iscsi_task *task)
489{
490 struct iscsi_conn *conn = task->conn;
491 struct iscsi_session *session = conn->session;
492 struct scsi_cmnd *sc = task->sc;
493 int oldstate = task->state;
494
495 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
496 task->itt, task->state, task->sc);
497
498 session->tt->cleanup_task(task);
499 task->state = ISCSI_TASK_FREE;
500 task->sc = NULL;
501
502
503
504 if (conn->login_task == task)
505 return;
506
507 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
508
509 if (sc) {
510
511 sc->SCp.ptr = NULL;
512
513
514
515
516 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
517 sc->scsi_done(sc);
518 }
519}
520
521void __iscsi_get_task(struct iscsi_task *task)
522{
523 atomic_inc(&task->refcount);
524}
525EXPORT_SYMBOL_GPL(__iscsi_get_task);
526
527void __iscsi_put_task(struct iscsi_task *task)
528{
529 if (atomic_dec_and_test(&task->refcount))
530 iscsi_free_task(task);
531}
532EXPORT_SYMBOL_GPL(__iscsi_put_task);
533
534void iscsi_put_task(struct iscsi_task *task)
535{
536 struct iscsi_session *session = task->conn->session;
537
538 spin_lock_bh(&session->lock);
539 __iscsi_put_task(task);
540 spin_unlock_bh(&session->lock);
541}
542EXPORT_SYMBOL_GPL(iscsi_put_task);
543
544
545
546
547
548
549
550
551static void iscsi_complete_task(struct iscsi_task *task, int state)
552{
553 struct iscsi_conn *conn = task->conn;
554
555 ISCSI_DBG_SESSION(conn->session,
556 "complete task itt 0x%x state %d sc %p\n",
557 task->itt, task->state, task->sc);
558 if (task->state == ISCSI_TASK_COMPLETED ||
559 task->state == ISCSI_TASK_ABRT_TMF ||
560 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
561 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
562 return;
563 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
564 task->state = state;
565
566 if (!list_empty(&task->running))
567 list_del_init(&task->running);
568
569 if (conn->task == task)
570 conn->task = NULL;
571
572 if (conn->ping_task == task)
573 conn->ping_task = NULL;
574
575
576 __iscsi_put_task(task);
577}
578
579
580
581
582
583
584
585
586
587
588
589
590void iscsi_complete_scsi_task(struct iscsi_task *task,
591 uint32_t exp_cmdsn, uint32_t max_cmdsn)
592{
593 struct iscsi_conn *conn = task->conn;
594
595 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
596
597 conn->last_recv = jiffies;
598 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
599 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
600}
601EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
602
603
604
605
606
607
608
609static void fail_scsi_task(struct iscsi_task *task, int err)
610{
611 struct iscsi_conn *conn = task->conn;
612 struct scsi_cmnd *sc;
613 int state;
614
615
616
617
618
619
620 sc = task->sc;
621 if (!sc)
622 return;
623
624 if (task->state == ISCSI_TASK_PENDING) {
625
626
627
628
629 conn->session->queued_cmdsn--;
630
631 state = ISCSI_TASK_COMPLETED;
632 } else if (err == DID_TRANSPORT_DISRUPTED)
633 state = ISCSI_TASK_ABRT_SESS_RECOV;
634 else
635 state = ISCSI_TASK_ABRT_TMF;
636
637 sc->result = err << 16;
638 if (!scsi_bidi_cmnd(sc))
639 scsi_set_resid(sc, scsi_bufflen(sc));
640 else {
641 scsi_out(sc)->resid = scsi_out(sc)->length;
642 scsi_in(sc)->resid = scsi_in(sc)->length;
643 }
644
645 iscsi_complete_task(task, state);
646}
647
648static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
649 struct iscsi_task *task)
650{
651 struct iscsi_session *session = conn->session;
652 struct iscsi_hdr *hdr = task->hdr;
653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
655
656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
657 return -ENOTCONN;
658
659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
661
662
663
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
666
667
668
669
670
671
672
673
674 if (conn->c_stage == ISCSI_CONN_STARTED &&
675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
676 session->queued_cmdsn++;
677 session->cmdsn++;
678 }
679 }
680
681 if (session->tt->init_task && session->tt->init_task(task))
682 return -EIO;
683
684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
685 session->state = ISCSI_STATE_LOGGING_OUT;
686
687 task->state = ISCSI_TASK_RUNNING;
688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
690 hdr->itt, task->data_count);
691 return 0;
692}
693
694static struct iscsi_task *
695__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
696 char *data, uint32_t data_size)
697{
698 struct iscsi_session *session = conn->session;
699 struct iscsi_host *ihost = shost_priv(session->host);
700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
701 struct iscsi_task *task;
702 itt_t itt;
703
704 if (session->state == ISCSI_STATE_TERMINATE)
705 return NULL;
706
707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
708
709
710
711
712
713
714 if (conn->login_task->state != ISCSI_TASK_FREE) {
715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
716 "progress. Cannot start new task.\n");
717 return NULL;
718 }
719
720 task = conn->login_task;
721 } else {
722 if (session->state != ISCSI_STATE_LOGGED_IN)
723 return NULL;
724
725 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
726 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
727
728 if (!kfifo_out(&session->cmdpool.queue,
729 (void*)&task, sizeof(void*)))
730 return NULL;
731 }
732
733
734
735
736
737 atomic_set(&task->refcount, 1);
738 task->conn = conn;
739 task->sc = NULL;
740 INIT_LIST_HEAD(&task->running);
741 task->state = ISCSI_TASK_PENDING;
742
743 if (data_size) {
744 memcpy(task->data, data, data_size);
745 task->data_count = data_size;
746 } else
747 task->data_count = 0;
748
749 if (conn->session->tt->alloc_pdu) {
750 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
751 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
752 "pdu for mgmt task.\n");
753 goto free_task;
754 }
755 }
756
757 itt = task->hdr->itt;
758 task->hdr_len = sizeof(struct iscsi_hdr);
759 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
760
761 if (hdr->itt != RESERVED_ITT) {
762 if (session->tt->parse_pdu_itt)
763 task->hdr->itt = itt;
764 else
765 task->hdr->itt = build_itt(task->itt,
766 task->conn->session->age);
767 }
768
769 if (!ihost->workq) {
770 if (iscsi_prep_mgmt_task(conn, task))
771 goto free_task;
772
773 if (session->tt->xmit_task(task))
774 goto free_task;
775 } else {
776 list_add_tail(&task->running, &conn->mgmtqueue);
777 iscsi_conn_queue_work(conn);
778 }
779
780 return task;
781
782free_task:
783 __iscsi_put_task(task);
784 return NULL;
785}
786
787int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
788 char *data, uint32_t data_size)
789{
790 struct iscsi_conn *conn = cls_conn->dd_data;
791 struct iscsi_session *session = conn->session;
792 int err = 0;
793
794 spin_lock_bh(&session->lock);
795 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
796 err = -EPERM;
797 spin_unlock_bh(&session->lock);
798 return err;
799}
800EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
801
802
803
804
805
806
807
808
809
810
811
812
813static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
814 struct iscsi_task *task, char *data,
815 int datalen)
816{
817 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
818 struct iscsi_session *session = conn->session;
819 struct scsi_cmnd *sc = task->sc;
820
821 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
822 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
823
824 sc->result = (DID_OK << 16) | rhdr->cmd_status;
825
826 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
827 sc->result = DID_ERROR << 16;
828 goto out;
829 }
830
831 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
832 uint16_t senselen;
833
834 if (datalen < 2) {
835invalid_datalen:
836 iscsi_conn_printk(KERN_ERR, conn,
837 "Got CHECK_CONDITION but invalid data "
838 "buffer size of %d\n", datalen);
839 sc->result = DID_BAD_TARGET << 16;
840 goto out;
841 }
842
843 senselen = get_unaligned_be16(data);
844 if (datalen < senselen)
845 goto invalid_datalen;
846
847 memcpy(sc->sense_buffer, data + 2,
848 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
849 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
850 min_t(uint16_t, senselen,
851 SCSI_SENSE_BUFFERSIZE));
852 }
853
854 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
855 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
856 int res_count = be32_to_cpu(rhdr->bi_residual_count);
857
858 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
859 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
860 res_count <= scsi_in(sc)->length))
861 scsi_in(sc)->resid = res_count;
862 else
863 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
864 }
865
866 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
867 ISCSI_FLAG_CMD_OVERFLOW)) {
868 int res_count = be32_to_cpu(rhdr->residual_count);
869
870 if (res_count > 0 &&
871 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
872 res_count <= scsi_bufflen(sc)))
873
874 scsi_set_resid(sc, res_count);
875 else
876 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
877 }
878out:
879 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
880 sc, sc->result, task->itt);
881 conn->scsirsp_pdus_cnt++;
882 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
883}
884
885
886
887
888
889
890
891static void
892iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
893 struct iscsi_task *task)
894{
895 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
896 struct scsi_cmnd *sc = task->sc;
897
898 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
899 return;
900
901 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
902 sc->result = (DID_OK << 16) | rhdr->cmd_status;
903 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
904 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
905 ISCSI_FLAG_DATA_OVERFLOW)) {
906 int res_count = be32_to_cpu(rhdr->residual_count);
907
908 if (res_count > 0 &&
909 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
910 res_count <= scsi_in(sc)->length))
911 scsi_in(sc)->resid = res_count;
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
914 }
915
916 ISCSI_DBG_SESSION(conn->session, "data in with status done "
917 "[sc %p res %d itt 0x%x]\n",
918 sc, sc->result, task->itt);
919 conn->scsirsp_pdus_cnt++;
920 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
921}
922
923static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
924{
925 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
926
927 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
928 conn->tmfrsp_pdus_cnt++;
929
930 if (conn->tmf_state != TMF_QUEUED)
931 return;
932
933 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
934 conn->tmf_state = TMF_SUCCESS;
935 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
936 conn->tmf_state = TMF_NOT_FOUND;
937 else
938 conn->tmf_state = TMF_FAILED;
939 wake_up(&conn->ehwait);
940}
941
942static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
943{
944 struct iscsi_nopout hdr;
945 struct iscsi_task *task;
946
947 if (!rhdr && conn->ping_task)
948 return;
949
950 memset(&hdr, 0, sizeof(struct iscsi_nopout));
951 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
952 hdr.flags = ISCSI_FLAG_CMD_FINAL;
953
954 if (rhdr) {
955 hdr.lun = rhdr->lun;
956 hdr.ttt = rhdr->ttt;
957 hdr.itt = RESERVED_ITT;
958 } else
959 hdr.ttt = RESERVED_ITT;
960
961 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
962 if (!task)
963 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
964 else if (!rhdr) {
965
966 conn->ping_task = task;
967 conn->last_ping = jiffies;
968 }
969}
970
971static int iscsi_nop_out_rsp(struct iscsi_task *task,
972 struct iscsi_nopin *nop, char *data, int datalen)
973{
974 struct iscsi_conn *conn = task->conn;
975 int rc = 0;
976
977 if (conn->ping_task != task) {
978
979
980
981
982 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
983 data, datalen))
984 rc = ISCSI_ERR_CONN_FAILED;
985 } else
986 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
987 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
988 return rc;
989}
990
991static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
992 char *data, int datalen)
993{
994 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
995 struct iscsi_hdr rejected_pdu;
996 int opcode, rc = 0;
997
998 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
999
1000 if (ntoh24(reject->dlength) > datalen ||
1001 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1002 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1003 "pdu. Invalid data length (pdu dlength "
1004 "%u, datalen %d\n", ntoh24(reject->dlength),
1005 datalen);
1006 return ISCSI_ERR_PROTO;
1007 }
1008 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1009 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1010
1011 switch (reject->reason) {
1012 case ISCSI_REASON_DATA_DIGEST_ERROR:
1013 iscsi_conn_printk(KERN_ERR, conn,
1014 "pdu (op 0x%x itt 0x%x) rejected "
1015 "due to DataDigest error.\n",
1016 rejected_pdu.itt, opcode);
1017 break;
1018 case ISCSI_REASON_IMM_CMD_REJECT:
1019 iscsi_conn_printk(KERN_ERR, conn,
1020 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1021 "immediate commands.\n",
1022 rejected_pdu.itt, opcode);
1023
1024
1025
1026
1027
1028
1029
1030
1031 if (opcode != ISCSI_OP_NOOP_OUT)
1032 return 0;
1033
1034 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1035
1036
1037
1038
1039 iscsi_send_nopout(conn,
1040 (struct iscsi_nopin*)&rejected_pdu);
1041 else {
1042 struct iscsi_task *task;
1043
1044
1045
1046
1047 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1048 if (!task) {
1049 iscsi_conn_printk(KERN_ERR, conn,
1050 "Invalid pdu reject. Could "
1051 "not lookup rejected task.\n");
1052 rc = ISCSI_ERR_BAD_ITT;
1053 } else
1054 rc = iscsi_nop_out_rsp(task,
1055 (struct iscsi_nopin*)&rejected_pdu,
1056 NULL, 0);
1057 }
1058 break;
1059 default:
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1062 "code 0x%x\n", rejected_pdu.itt,
1063 rejected_pdu.opcode, reject->reason);
1064 break;
1065 }
1066 return rc;
1067}
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1080{
1081 struct iscsi_session *session = conn->session;
1082 int i;
1083
1084 if (itt == RESERVED_ITT)
1085 return NULL;
1086
1087 if (session->tt->parse_pdu_itt)
1088 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1089 else
1090 i = get_itt(itt);
1091 if (i >= session->cmds_max)
1092 return NULL;
1093
1094 return session->cmds[i];
1095}
1096EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1110 char *data, int datalen)
1111{
1112 struct iscsi_session *session = conn->session;
1113 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1114 struct iscsi_task *task;
1115 uint32_t itt;
1116
1117 conn->last_recv = jiffies;
1118 rc = iscsi_verify_itt(conn, hdr->itt);
1119 if (rc)
1120 return rc;
1121
1122 if (hdr->itt != RESERVED_ITT)
1123 itt = get_itt(hdr->itt);
1124 else
1125 itt = ~0U;
1126
1127 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1128 opcode, conn->id, itt, datalen);
1129
1130 if (itt == ~0U) {
1131 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1132
1133 switch(opcode) {
1134 case ISCSI_OP_NOOP_IN:
1135 if (datalen) {
1136 rc = ISCSI_ERR_PROTO;
1137 break;
1138 }
1139
1140 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1141 break;
1142
1143 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1144 break;
1145 case ISCSI_OP_REJECT:
1146 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1147 break;
1148 case ISCSI_OP_ASYNC_EVENT:
1149 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1150 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1151 rc = ISCSI_ERR_CONN_FAILED;
1152 break;
1153 default:
1154 rc = ISCSI_ERR_BAD_OPCODE;
1155 break;
1156 }
1157 goto out;
1158 }
1159
1160 switch(opcode) {
1161 case ISCSI_OP_SCSI_CMD_RSP:
1162 case ISCSI_OP_SCSI_DATA_IN:
1163 task = iscsi_itt_to_ctask(conn, hdr->itt);
1164 if (!task)
1165 return ISCSI_ERR_BAD_ITT;
1166 task->last_xfer = jiffies;
1167 break;
1168 case ISCSI_OP_R2T:
1169
1170
1171
1172 return 0;
1173 case ISCSI_OP_LOGOUT_RSP:
1174 case ISCSI_OP_LOGIN_RSP:
1175 case ISCSI_OP_TEXT_RSP:
1176 case ISCSI_OP_SCSI_TMFUNC_RSP:
1177 case ISCSI_OP_NOOP_IN:
1178 task = iscsi_itt_to_task(conn, hdr->itt);
1179 if (!task)
1180 return ISCSI_ERR_BAD_ITT;
1181 break;
1182 default:
1183 return ISCSI_ERR_BAD_OPCODE;
1184 }
1185
1186 switch(opcode) {
1187 case ISCSI_OP_SCSI_CMD_RSP:
1188 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1189 break;
1190 case ISCSI_OP_SCSI_DATA_IN:
1191 iscsi_data_in_rsp(conn, hdr, task);
1192 break;
1193 case ISCSI_OP_LOGOUT_RSP:
1194 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1195 if (datalen) {
1196 rc = ISCSI_ERR_PROTO;
1197 break;
1198 }
1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1200 goto recv_pdu;
1201 case ISCSI_OP_LOGIN_RSP:
1202 case ISCSI_OP_TEXT_RSP:
1203 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1204
1205
1206
1207
1208 goto recv_pdu;
1209 case ISCSI_OP_SCSI_TMFUNC_RSP:
1210 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1211 if (datalen) {
1212 rc = ISCSI_ERR_PROTO;
1213 break;
1214 }
1215
1216 iscsi_tmf_rsp(conn, hdr);
1217 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1218 break;
1219 case ISCSI_OP_NOOP_IN:
1220 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1221 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1222 rc = ISCSI_ERR_PROTO;
1223 break;
1224 }
1225 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1226
1227 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1228 data, datalen);
1229 break;
1230 default:
1231 rc = ISCSI_ERR_BAD_OPCODE;
1232 break;
1233 }
1234
1235out:
1236 return rc;
1237recv_pdu:
1238 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1239 rc = ISCSI_ERR_CONN_FAILED;
1240 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1241 return rc;
1242}
1243EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1244
1245int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1246 char *data, int datalen)
1247{
1248 int rc;
1249
1250 spin_lock(&conn->session->lock);
1251 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1252 spin_unlock(&conn->session->lock);
1253 return rc;
1254}
1255EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1256
1257int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1258{
1259 struct iscsi_session *session = conn->session;
1260 int age = 0, i = 0;
1261
1262 if (itt == RESERVED_ITT)
1263 return 0;
1264
1265 if (session->tt->parse_pdu_itt)
1266 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1267 else {
1268 i = get_itt(itt);
1269 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1270 }
1271
1272 if (age != session->age) {
1273 iscsi_conn_printk(KERN_ERR, conn,
1274 "received itt %x expected session age (%x)\n",
1275 (__force u32)itt, session->age);
1276 return ISCSI_ERR_BAD_ITT;
1277 }
1278
1279 if (i >= session->cmds_max) {
1280 iscsi_conn_printk(KERN_ERR, conn,
1281 "received invalid itt index %u (max cmds "
1282 "%u.\n", i, session->cmds_max);
1283 return ISCSI_ERR_BAD_ITT;
1284 }
1285 return 0;
1286}
1287EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1299{
1300 struct iscsi_task *task;
1301
1302 if (iscsi_verify_itt(conn, itt))
1303 return NULL;
1304
1305 task = iscsi_itt_to_task(conn, itt);
1306 if (!task || !task->sc)
1307 return NULL;
1308
1309 if (task->sc->SCp.phase != conn->session->age) {
1310 iscsi_session_printk(KERN_ERR, conn->session,
1311 "task's session age %d, expected %d\n",
1312 task->sc->SCp.phase, conn->session->age);
1313 return NULL;
1314 }
1315
1316 return task;
1317}
1318EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1319
1320void iscsi_session_failure(struct iscsi_session *session,
1321 enum iscsi_err err)
1322{
1323 struct iscsi_conn *conn;
1324 struct device *dev;
1325
1326 spin_lock_bh(&session->lock);
1327 conn = session->leadconn;
1328 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1329 spin_unlock_bh(&session->lock);
1330 return;
1331 }
1332
1333 dev = get_device(&conn->cls_conn->dev);
1334 spin_unlock_bh(&session->lock);
1335 if (!dev)
1336 return;
1337
1338
1339
1340
1341
1342 if (err == ISCSI_ERR_INVALID_HOST)
1343 iscsi_conn_error_event(conn->cls_conn, err);
1344 else
1345 iscsi_conn_failure(conn, err);
1346 put_device(dev);
1347}
1348EXPORT_SYMBOL_GPL(iscsi_session_failure);
1349
1350void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1351{
1352 struct iscsi_session *session = conn->session;
1353
1354 spin_lock_bh(&session->lock);
1355 if (session->state == ISCSI_STATE_FAILED) {
1356 spin_unlock_bh(&session->lock);
1357 return;
1358 }
1359
1360 if (conn->stop_stage == 0)
1361 session->state = ISCSI_STATE_FAILED;
1362 spin_unlock_bh(&session->lock);
1363
1364 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1365 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1366 iscsi_conn_error_event(conn->cls_conn, err);
1367}
1368EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1369
1370static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1371{
1372 struct iscsi_session *session = conn->session;
1373
1374
1375
1376
1377 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1378 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1379 "%u MaxCmdSN %u CmdSN %u/%u\n",
1380 session->exp_cmdsn, session->max_cmdsn,
1381 session->cmdsn, session->queued_cmdsn);
1382 return -ENOSPC;
1383 }
1384 return 0;
1385}
1386
1387static int iscsi_xmit_task(struct iscsi_conn *conn)
1388{
1389 struct iscsi_task *task = conn->task;
1390 int rc;
1391
1392 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1393 return -ENODATA;
1394
1395 __iscsi_get_task(task);
1396 spin_unlock_bh(&conn->session->lock);
1397 rc = conn->session->tt->xmit_task(task);
1398 spin_lock_bh(&conn->session->lock);
1399 if (!rc) {
1400
1401 task->last_xfer = jiffies;
1402 conn->task = NULL;
1403 }
1404 __iscsi_put_task(task);
1405 return rc;
1406}
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416void iscsi_requeue_task(struct iscsi_task *task)
1417{
1418 struct iscsi_conn *conn = task->conn;
1419
1420
1421
1422
1423
1424 if (list_empty(&task->running))
1425 list_add_tail(&task->running, &conn->requeue);
1426 iscsi_conn_queue_work(conn);
1427}
1428EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439static int iscsi_data_xmit(struct iscsi_conn *conn)
1440{
1441 struct iscsi_task *task;
1442 int rc = 0;
1443
1444 spin_lock_bh(&conn->session->lock);
1445 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1446 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1447 spin_unlock_bh(&conn->session->lock);
1448 return -ENODATA;
1449 }
1450
1451 if (conn->task) {
1452 rc = iscsi_xmit_task(conn);
1453 if (rc)
1454 goto done;
1455 }
1456
1457
1458
1459
1460
1461
1462check_mgmt:
1463 while (!list_empty(&conn->mgmtqueue)) {
1464 conn->task = list_entry(conn->mgmtqueue.next,
1465 struct iscsi_task, running);
1466 list_del_init(&conn->task->running);
1467 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1468 __iscsi_put_task(conn->task);
1469 conn->task = NULL;
1470 continue;
1471 }
1472 rc = iscsi_xmit_task(conn);
1473 if (rc)
1474 goto done;
1475 }
1476
1477
1478 while (!list_empty(&conn->cmdqueue)) {
1479 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1480 running);
1481 list_del_init(&conn->task->running);
1482 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1483 fail_scsi_task(conn->task, DID_IMM_RETRY);
1484 continue;
1485 }
1486 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1487 if (rc) {
1488 if (rc == -ENOMEM || rc == -EACCES) {
1489 list_add_tail(&conn->task->running,
1490 &conn->cmdqueue);
1491 conn->task = NULL;
1492 goto done;
1493 } else
1494 fail_scsi_task(conn->task, DID_ABORT);
1495 continue;
1496 }
1497 rc = iscsi_xmit_task(conn);
1498 if (rc)
1499 goto done;
1500
1501
1502
1503
1504
1505 if (!list_empty(&conn->mgmtqueue))
1506 goto check_mgmt;
1507 }
1508
1509 while (!list_empty(&conn->requeue)) {
1510
1511
1512
1513 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1514 break;
1515
1516 task = list_entry(conn->requeue.next, struct iscsi_task,
1517 running);
1518 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1519 break;
1520
1521 conn->task = task;
1522 list_del_init(&conn->task->running);
1523 conn->task->state = ISCSI_TASK_RUNNING;
1524 rc = iscsi_xmit_task(conn);
1525 if (rc)
1526 goto done;
1527 if (!list_empty(&conn->mgmtqueue))
1528 goto check_mgmt;
1529 }
1530 spin_unlock_bh(&conn->session->lock);
1531 return -ENODATA;
1532
1533done:
1534 spin_unlock_bh(&conn->session->lock);
1535 return rc;
1536}
1537
1538static void iscsi_xmitworker(struct work_struct *work)
1539{
1540 struct iscsi_conn *conn =
1541 container_of(work, struct iscsi_conn, xmitwork);
1542 int rc;
1543
1544
1545
1546 do {
1547 rc = iscsi_data_xmit(conn);
1548 } while (rc >= 0 || rc == -EAGAIN);
1549}
1550
1551static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1552 struct scsi_cmnd *sc)
1553{
1554 struct iscsi_task *task;
1555
1556 if (!kfifo_out(&conn->session->cmdpool.queue,
1557 (void *) &task, sizeof(void *)))
1558 return NULL;
1559
1560 sc->SCp.phase = conn->session->age;
1561 sc->SCp.ptr = (char *) task;
1562
1563 atomic_set(&task->refcount, 1);
1564 task->state = ISCSI_TASK_PENDING;
1565 task->conn = conn;
1566 task->sc = sc;
1567 task->have_checked_conn = false;
1568 task->last_timeout = jiffies;
1569 task->last_xfer = jiffies;
1570 INIT_LIST_HEAD(&task->running);
1571 return task;
1572}
1573
1574enum {
1575 FAILURE_BAD_HOST = 1,
1576 FAILURE_SESSION_FAILED,
1577 FAILURE_SESSION_FREED,
1578 FAILURE_WINDOW_CLOSED,
1579 FAILURE_OOM,
1580 FAILURE_SESSION_TERMINATE,
1581 FAILURE_SESSION_IN_RECOVERY,
1582 FAILURE_SESSION_RECOVERY_TIMEOUT,
1583 FAILURE_SESSION_LOGGING_OUT,
1584 FAILURE_SESSION_NOT_READY,
1585};
1586
1587int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1588{
1589 struct iscsi_cls_session *cls_session;
1590 struct iscsi_host *ihost;
1591 int reason = 0;
1592 struct iscsi_session *session;
1593 struct iscsi_conn *conn;
1594 struct iscsi_task *task = NULL;
1595
1596 sc->result = 0;
1597 sc->SCp.ptr = NULL;
1598
1599 ihost = shost_priv(host);
1600
1601 cls_session = starget_to_session(scsi_target(sc->device));
1602 session = cls_session->dd_data;
1603 spin_lock_bh(&session->lock);
1604
1605 reason = iscsi_session_chkready(cls_session);
1606 if (reason) {
1607 sc->result = reason;
1608 goto fault;
1609 }
1610
1611 if (session->state != ISCSI_STATE_LOGGED_IN) {
1612
1613
1614
1615
1616
1617
1618 switch (session->state) {
1619 case ISCSI_STATE_FAILED:
1620 case ISCSI_STATE_IN_RECOVERY:
1621 reason = FAILURE_SESSION_IN_RECOVERY;
1622 sc->result = DID_IMM_RETRY << 16;
1623 break;
1624 case ISCSI_STATE_LOGGING_OUT:
1625 reason = FAILURE_SESSION_LOGGING_OUT;
1626 sc->result = DID_IMM_RETRY << 16;
1627 break;
1628 case ISCSI_STATE_RECOVERY_FAILED:
1629 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1630 sc->result = DID_TRANSPORT_FAILFAST << 16;
1631 break;
1632 case ISCSI_STATE_TERMINATE:
1633 reason = FAILURE_SESSION_TERMINATE;
1634 sc->result = DID_NO_CONNECT << 16;
1635 break;
1636 default:
1637 reason = FAILURE_SESSION_FREED;
1638 sc->result = DID_NO_CONNECT << 16;
1639 }
1640 goto fault;
1641 }
1642
1643 conn = session->leadconn;
1644 if (!conn) {
1645 reason = FAILURE_SESSION_FREED;
1646 sc->result = DID_NO_CONNECT << 16;
1647 goto fault;
1648 }
1649
1650 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1651 reason = FAILURE_SESSION_IN_RECOVERY;
1652 sc->result = DID_REQUEUE;
1653 goto fault;
1654 }
1655
1656 if (iscsi_check_cmdsn_window_closed(conn)) {
1657 reason = FAILURE_WINDOW_CLOSED;
1658 goto reject;
1659 }
1660
1661 task = iscsi_alloc_task(conn, sc);
1662 if (!task) {
1663 reason = FAILURE_OOM;
1664 goto reject;
1665 }
1666
1667 if (!ihost->workq) {
1668 reason = iscsi_prep_scsi_cmd_pdu(task);
1669 if (reason) {
1670 if (reason == -ENOMEM || reason == -EACCES) {
1671 reason = FAILURE_OOM;
1672 goto prepd_reject;
1673 } else {
1674 sc->result = DID_ABORT << 16;
1675 goto prepd_fault;
1676 }
1677 }
1678 if (session->tt->xmit_task(task)) {
1679 session->cmdsn--;
1680 reason = FAILURE_SESSION_NOT_READY;
1681 goto prepd_reject;
1682 }
1683 } else {
1684 list_add_tail(&task->running, &conn->cmdqueue);
1685 iscsi_conn_queue_work(conn);
1686 }
1687
1688 session->queued_cmdsn++;
1689 spin_unlock_bh(&session->lock);
1690 return 0;
1691
1692prepd_reject:
1693 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1694reject:
1695 spin_unlock_bh(&session->lock);
1696 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1697 sc->cmnd[0], reason);
1698 return SCSI_MLQUEUE_TARGET_BUSY;
1699
1700prepd_fault:
1701 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1702fault:
1703 spin_unlock_bh(&session->lock);
1704 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1705 sc->cmnd[0], reason);
1706 if (!scsi_bidi_cmnd(sc))
1707 scsi_set_resid(sc, scsi_bufflen(sc));
1708 else {
1709 scsi_out(sc)->resid = scsi_out(sc)->length;
1710 scsi_in(sc)->resid = scsi_in(sc)->length;
1711 }
1712 sc->scsi_done(sc);
1713 return 0;
1714}
1715EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1716
1717int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
1718{
1719 switch (reason) {
1720 case SCSI_QDEPTH_DEFAULT:
1721 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1722 break;
1723 case SCSI_QDEPTH_QFULL:
1724 scsi_track_queue_full(sdev, depth);
1725 break;
1726 case SCSI_QDEPTH_RAMP_UP:
1727 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1728 break;
1729 default:
1730 return -EOPNOTSUPP;
1731 }
1732 return sdev->queue_depth;
1733}
1734EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1735
1736int iscsi_target_alloc(struct scsi_target *starget)
1737{
1738 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1739 struct iscsi_session *session = cls_session->dd_data;
1740
1741 starget->can_queue = session->scsi_cmds_max;
1742 return 0;
1743}
1744EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1745
1746static void iscsi_tmf_timedout(unsigned long data)
1747{
1748 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1749 struct iscsi_session *session = conn->session;
1750
1751 spin_lock(&session->lock);
1752 if (conn->tmf_state == TMF_QUEUED) {
1753 conn->tmf_state = TMF_TIMEDOUT;
1754 ISCSI_DBG_EH(session, "tmf timedout\n");
1755
1756 wake_up(&conn->ehwait);
1757 }
1758 spin_unlock(&session->lock);
1759}
1760
1761static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1762 struct iscsi_tm *hdr, int age,
1763 int timeout)
1764{
1765 struct iscsi_session *session = conn->session;
1766 struct iscsi_task *task;
1767
1768 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1769 NULL, 0);
1770 if (!task) {
1771 spin_unlock_bh(&session->lock);
1772 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1773 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1774 spin_lock_bh(&session->lock);
1775 return -EPERM;
1776 }
1777 conn->tmfcmd_pdus_cnt++;
1778 conn->tmf_timer.expires = timeout * HZ + jiffies;
1779 conn->tmf_timer.function = iscsi_tmf_timedout;
1780 conn->tmf_timer.data = (unsigned long)conn;
1781 add_timer(&conn->tmf_timer);
1782 ISCSI_DBG_EH(session, "tmf set timeout\n");
1783
1784 spin_unlock_bh(&session->lock);
1785 mutex_unlock(&session->eh_mutex);
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795 wait_event_interruptible(conn->ehwait, age != session->age ||
1796 session->state != ISCSI_STATE_LOGGED_IN ||
1797 conn->tmf_state != TMF_QUEUED);
1798 if (signal_pending(current))
1799 flush_signals(current);
1800 del_timer_sync(&conn->tmf_timer);
1801
1802 mutex_lock(&session->eh_mutex);
1803 spin_lock_bh(&session->lock);
1804
1805 if (age != session->age ||
1806 session->state != ISCSI_STATE_LOGGED_IN)
1807 return -ENOTCONN;
1808 return 0;
1809}
1810
1811
1812
1813
1814
1815static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1816 int error)
1817{
1818 struct iscsi_task *task;
1819 int i;
1820
1821 for (i = 0; i < conn->session->cmds_max; i++) {
1822 task = conn->session->cmds[i];
1823 if (!task->sc || task->state == ISCSI_TASK_FREE)
1824 continue;
1825
1826 if (lun != -1 && lun != task->sc->device->lun)
1827 continue;
1828
1829 ISCSI_DBG_SESSION(conn->session,
1830 "failing sc %p itt 0x%x state %d\n",
1831 task->sc, task->itt, task->state);
1832 fail_scsi_task(task, error);
1833 }
1834}
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847void iscsi_suspend_queue(struct iscsi_conn *conn)
1848{
1849 spin_lock_bh(&conn->session->lock);
1850 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1851 spin_unlock_bh(&conn->session->lock);
1852}
1853EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863void iscsi_suspend_tx(struct iscsi_conn *conn)
1864{
1865 struct Scsi_Host *shost = conn->session->host;
1866 struct iscsi_host *ihost = shost_priv(shost);
1867
1868 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1869 if (ihost->workq)
1870 flush_workqueue(ihost->workq);
1871}
1872EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1873
1874static void iscsi_start_tx(struct iscsi_conn *conn)
1875{
1876 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1877 iscsi_conn_queue_work(conn);
1878}
1879
1880
1881
1882
1883
1884
1885
1886static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1887{
1888 if (conn->ping_task &&
1889 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1890 (conn->ping_timeout * HZ), jiffies))
1891 return 1;
1892 else
1893 return 0;
1894}
1895
1896static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1897{
1898 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1899 struct iscsi_task *task = NULL, *running_task;
1900 struct iscsi_cls_session *cls_session;
1901 struct iscsi_session *session;
1902 struct iscsi_conn *conn;
1903 int i;
1904
1905 cls_session = starget_to_session(scsi_target(sc->device));
1906 session = cls_session->dd_data;
1907
1908 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1909
1910 spin_lock(&session->lock);
1911 task = (struct iscsi_task *)sc->SCp.ptr;
1912 if (!task) {
1913
1914
1915
1916
1917 rc = BLK_EH_HANDLED;
1918 goto done;
1919 }
1920
1921 if (session->state != ISCSI_STATE_LOGGED_IN) {
1922
1923
1924
1925
1926 rc = BLK_EH_RESET_TIMER;
1927 goto done;
1928 }
1929
1930 conn = session->leadconn;
1931 if (!conn) {
1932
1933 rc = BLK_EH_RESET_TIMER;
1934 goto done;
1935 }
1936
1937
1938
1939
1940
1941
1942
1943
1944 if (time_after(task->last_xfer, task->last_timeout)) {
1945 ISCSI_DBG_EH(session, "Command making progress. Asking "
1946 "scsi-ml for more time to complete. "
1947 "Last data xfer at %lu. Last timeout was at "
1948 "%lu\n.", task->last_xfer, task->last_timeout);
1949 task->have_checked_conn = false;
1950 rc = BLK_EH_RESET_TIMER;
1951 goto done;
1952 }
1953
1954 if (!conn->recv_timeout && !conn->ping_timeout)
1955 goto done;
1956
1957
1958
1959
1960 if (iscsi_has_ping_timed_out(conn)) {
1961 rc = BLK_EH_RESET_TIMER;
1962 goto done;
1963 }
1964
1965 for (i = 0; i < conn->session->cmds_max; i++) {
1966 running_task = conn->session->cmds[i];
1967 if (!running_task->sc || running_task == task ||
1968 running_task->state != ISCSI_TASK_RUNNING)
1969 continue;
1970
1971
1972
1973
1974
1975 if (time_after(running_task->sc->jiffies_at_alloc,
1976 task->sc->jiffies_at_alloc))
1977 continue;
1978
1979 if (time_after(running_task->last_xfer, task->last_timeout)) {
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990 ISCSI_DBG_EH(session, "Command has not made progress "
1991 "but commands ahead of it have. "
1992 "Asking scsi-ml for more time to "
1993 "complete. Our last xfer vs running task "
1994 "last xfer %lu/%lu. Last check %lu.\n",
1995 task->last_xfer, running_task->last_xfer,
1996 task->last_timeout);
1997 rc = BLK_EH_RESET_TIMER;
1998 goto done;
1999 }
2000 }
2001
2002
2003 if (task->have_checked_conn)
2004 goto done;
2005
2006
2007
2008
2009
2010 if (conn->ping_task) {
2011 task->have_checked_conn = true;
2012 rc = BLK_EH_RESET_TIMER;
2013 goto done;
2014 }
2015
2016
2017 iscsi_send_nopout(conn, NULL);
2018 task->have_checked_conn = true;
2019 rc = BLK_EH_RESET_TIMER;
2020
2021done:
2022 if (task)
2023 task->last_timeout = jiffies;
2024 spin_unlock(&session->lock);
2025 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2026 "timer reset" : "nh");
2027 return rc;
2028}
2029
2030static void iscsi_check_transport_timeouts(unsigned long data)
2031{
2032 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2033 struct iscsi_session *session = conn->session;
2034 unsigned long recv_timeout, next_timeout = 0, last_recv;
2035
2036 spin_lock(&session->lock);
2037 if (session->state != ISCSI_STATE_LOGGED_IN)
2038 goto done;
2039
2040 recv_timeout = conn->recv_timeout;
2041 if (!recv_timeout)
2042 goto done;
2043
2044 recv_timeout *= HZ;
2045 last_recv = conn->last_recv;
2046
2047 if (iscsi_has_ping_timed_out(conn)) {
2048 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2049 "expired, recv timeout %d, last rx %lu, "
2050 "last ping %lu, now %lu\n",
2051 conn->ping_timeout, conn->recv_timeout,
2052 last_recv, conn->last_ping, jiffies);
2053 spin_unlock(&session->lock);
2054 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2055 return;
2056 }
2057
2058 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2059
2060 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2061 iscsi_send_nopout(conn, NULL);
2062 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2063 } else
2064 next_timeout = last_recv + recv_timeout;
2065
2066 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2067 mod_timer(&conn->transport_timer, next_timeout);
2068done:
2069 spin_unlock(&session->lock);
2070}
2071
2072static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2073 struct iscsi_tm *hdr)
2074{
2075 memset(hdr, 0, sizeof(*hdr));
2076 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2077 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2078 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2079 hdr->lun = task->lun;
2080 hdr->rtt = task->hdr_itt;
2081 hdr->refcmdsn = task->cmdsn;
2082}
2083
2084int iscsi_eh_abort(struct scsi_cmnd *sc)
2085{
2086 struct iscsi_cls_session *cls_session;
2087 struct iscsi_session *session;
2088 struct iscsi_conn *conn;
2089 struct iscsi_task *task;
2090 struct iscsi_tm *hdr;
2091 int rc, age;
2092
2093 cls_session = starget_to_session(scsi_target(sc->device));
2094 session = cls_session->dd_data;
2095
2096 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2097
2098 mutex_lock(&session->eh_mutex);
2099 spin_lock_bh(&session->lock);
2100
2101
2102
2103
2104 if (!sc->SCp.ptr) {
2105 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2106 "it completed.\n");
2107 spin_unlock_bh(&session->lock);
2108 mutex_unlock(&session->eh_mutex);
2109 return SUCCESS;
2110 }
2111
2112
2113
2114
2115
2116 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2117 sc->SCp.phase != session->age) {
2118 spin_unlock_bh(&session->lock);
2119 mutex_unlock(&session->eh_mutex);
2120 ISCSI_DBG_EH(session, "failing abort due to dropped "
2121 "session.\n");
2122 return FAILED;
2123 }
2124
2125 conn = session->leadconn;
2126 conn->eh_abort_cnt++;
2127 age = session->age;
2128
2129 task = (struct iscsi_task *)sc->SCp.ptr;
2130 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2131 sc, task->itt);
2132
2133
2134 if (!task->sc) {
2135 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2136 goto success;
2137 }
2138
2139 if (task->state == ISCSI_TASK_PENDING) {
2140 fail_scsi_task(task, DID_ABORT);
2141 goto success;
2142 }
2143
2144
2145 if (conn->tmf_state != TMF_INITIAL)
2146 goto failed;
2147 conn->tmf_state = TMF_QUEUED;
2148
2149 hdr = &conn->tmhdr;
2150 iscsi_prep_abort_task_pdu(task, hdr);
2151
2152 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2153 rc = FAILED;
2154 goto failed;
2155 }
2156
2157 switch (conn->tmf_state) {
2158 case TMF_SUCCESS:
2159 spin_unlock_bh(&session->lock);
2160
2161
2162
2163
2164 iscsi_suspend_tx(conn);
2165
2166
2167
2168
2169
2170 spin_lock_bh(&session->lock);
2171 fail_scsi_task(task, DID_ABORT);
2172 conn->tmf_state = TMF_INITIAL;
2173 memset(hdr, 0, sizeof(*hdr));
2174 spin_unlock_bh(&session->lock);
2175 iscsi_start_tx(conn);
2176 goto success_unlocked;
2177 case TMF_TIMEDOUT:
2178 spin_unlock_bh(&session->lock);
2179 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2180 goto failed_unlocked;
2181 case TMF_NOT_FOUND:
2182 if (!sc->SCp.ptr) {
2183 conn->tmf_state = TMF_INITIAL;
2184 memset(hdr, 0, sizeof(*hdr));
2185
2186 ISCSI_DBG_EH(session, "sc completed while abort in "
2187 "progress\n");
2188 goto success;
2189 }
2190
2191 default:
2192 conn->tmf_state = TMF_INITIAL;
2193 goto failed;
2194 }
2195
2196success:
2197 spin_unlock_bh(&session->lock);
2198success_unlocked:
2199 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2200 sc, task->itt);
2201 mutex_unlock(&session->eh_mutex);
2202 return SUCCESS;
2203
2204failed:
2205 spin_unlock_bh(&session->lock);
2206failed_unlocked:
2207 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2208 task ? task->itt : 0);
2209 mutex_unlock(&session->eh_mutex);
2210 return FAILED;
2211}
2212EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2213
2214static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2215{
2216 memset(hdr, 0, sizeof(*hdr));
2217 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2218 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2219 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2220 int_to_scsilun(sc->device->lun, &hdr->lun);
2221 hdr->rtt = RESERVED_ITT;
2222}
2223
2224int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2225{
2226 struct iscsi_cls_session *cls_session;
2227 struct iscsi_session *session;
2228 struct iscsi_conn *conn;
2229 struct iscsi_tm *hdr;
2230 int rc = FAILED;
2231
2232 cls_session = starget_to_session(scsi_target(sc->device));
2233 session = cls_session->dd_data;
2234
2235 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
2236
2237 mutex_lock(&session->eh_mutex);
2238 spin_lock_bh(&session->lock);
2239
2240
2241
2242
2243 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2244 goto unlock;
2245 conn = session->leadconn;
2246
2247
2248 if (conn->tmf_state != TMF_INITIAL)
2249 goto unlock;
2250 conn->tmf_state = TMF_QUEUED;
2251
2252 hdr = &conn->tmhdr;
2253 iscsi_prep_lun_reset_pdu(sc, hdr);
2254
2255 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2256 session->lu_reset_timeout)) {
2257 rc = FAILED;
2258 goto unlock;
2259 }
2260
2261 switch (conn->tmf_state) {
2262 case TMF_SUCCESS:
2263 break;
2264 case TMF_TIMEDOUT:
2265 spin_unlock_bh(&session->lock);
2266 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2267 goto done;
2268 default:
2269 conn->tmf_state = TMF_INITIAL;
2270 goto unlock;
2271 }
2272
2273 rc = SUCCESS;
2274 spin_unlock_bh(&session->lock);
2275
2276 iscsi_suspend_tx(conn);
2277
2278 spin_lock_bh(&session->lock);
2279 memset(hdr, 0, sizeof(*hdr));
2280 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2281 conn->tmf_state = TMF_INITIAL;
2282 spin_unlock_bh(&session->lock);
2283
2284 iscsi_start_tx(conn);
2285 goto done;
2286
2287unlock:
2288 spin_unlock_bh(&session->lock);
2289done:
2290 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2291 rc == SUCCESS ? "SUCCESS" : "FAILED");
2292 mutex_unlock(&session->eh_mutex);
2293 return rc;
2294}
2295EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2296
2297void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2298{
2299 struct iscsi_session *session = cls_session->dd_data;
2300
2301 spin_lock_bh(&session->lock);
2302 if (session->state != ISCSI_STATE_LOGGED_IN) {
2303 session->state = ISCSI_STATE_RECOVERY_FAILED;
2304 if (session->leadconn)
2305 wake_up(&session->leadconn->ehwait);
2306 }
2307 spin_unlock_bh(&session->lock);
2308}
2309EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2310
2311
2312
2313
2314
2315
2316
2317
2318int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2319{
2320 struct iscsi_cls_session *cls_session;
2321 struct iscsi_session *session;
2322 struct iscsi_conn *conn;
2323
2324 cls_session = starget_to_session(scsi_target(sc->device));
2325 session = cls_session->dd_data;
2326 conn = session->leadconn;
2327
2328 mutex_lock(&session->eh_mutex);
2329 spin_lock_bh(&session->lock);
2330 if (session->state == ISCSI_STATE_TERMINATE) {
2331failed:
2332 ISCSI_DBG_EH(session,
2333 "failing session reset: Could not log back into "
2334 "%s, %s [age %d]\n", session->targetname,
2335 conn->persistent_address, session->age);
2336 spin_unlock_bh(&session->lock);
2337 mutex_unlock(&session->eh_mutex);
2338 return FAILED;
2339 }
2340
2341 spin_unlock_bh(&session->lock);
2342 mutex_unlock(&session->eh_mutex);
2343
2344
2345
2346
2347 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2348
2349 ISCSI_DBG_EH(session, "wait for relogin\n");
2350 wait_event_interruptible(conn->ehwait,
2351 session->state == ISCSI_STATE_TERMINATE ||
2352 session->state == ISCSI_STATE_LOGGED_IN ||
2353 session->state == ISCSI_STATE_RECOVERY_FAILED);
2354 if (signal_pending(current))
2355 flush_signals(current);
2356
2357 mutex_lock(&session->eh_mutex);
2358 spin_lock_bh(&session->lock);
2359 if (session->state == ISCSI_STATE_LOGGED_IN) {
2360 ISCSI_DBG_EH(session,
2361 "session reset succeeded for %s,%s\n",
2362 session->targetname, conn->persistent_address);
2363 } else
2364 goto failed;
2365 spin_unlock_bh(&session->lock);
2366 mutex_unlock(&session->eh_mutex);
2367 return SUCCESS;
2368}
2369EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2370
2371static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2372{
2373 memset(hdr, 0, sizeof(*hdr));
2374 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2375 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2376 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2377 hdr->rtt = RESERVED_ITT;
2378}
2379
2380
2381
2382
2383
2384
2385
2386int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2387{
2388 struct iscsi_cls_session *cls_session;
2389 struct iscsi_session *session;
2390 struct iscsi_conn *conn;
2391 struct iscsi_tm *hdr;
2392 int rc = FAILED;
2393
2394 cls_session = starget_to_session(scsi_target(sc->device));
2395 session = cls_session->dd_data;
2396
2397 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2398 session->targetname);
2399
2400 mutex_lock(&session->eh_mutex);
2401 spin_lock_bh(&session->lock);
2402
2403
2404
2405
2406 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2407 goto unlock;
2408 conn = session->leadconn;
2409
2410
2411 if (conn->tmf_state != TMF_INITIAL)
2412 goto unlock;
2413 conn->tmf_state = TMF_QUEUED;
2414
2415 hdr = &conn->tmhdr;
2416 iscsi_prep_tgt_reset_pdu(sc, hdr);
2417
2418 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2419 session->tgt_reset_timeout)) {
2420 rc = FAILED;
2421 goto unlock;
2422 }
2423
2424 switch (conn->tmf_state) {
2425 case TMF_SUCCESS:
2426 break;
2427 case TMF_TIMEDOUT:
2428 spin_unlock_bh(&session->lock);
2429 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2430 goto done;
2431 default:
2432 conn->tmf_state = TMF_INITIAL;
2433 goto unlock;
2434 }
2435
2436 rc = SUCCESS;
2437 spin_unlock_bh(&session->lock);
2438
2439 iscsi_suspend_tx(conn);
2440
2441 spin_lock_bh(&session->lock);
2442 memset(hdr, 0, sizeof(*hdr));
2443 fail_scsi_tasks(conn, -1, DID_ERROR);
2444 conn->tmf_state = TMF_INITIAL;
2445 spin_unlock_bh(&session->lock);
2446
2447 iscsi_start_tx(conn);
2448 goto done;
2449
2450unlock:
2451 spin_unlock_bh(&session->lock);
2452done:
2453 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2454 rc == SUCCESS ? "SUCCESS" : "FAILED");
2455 mutex_unlock(&session->eh_mutex);
2456 return rc;
2457}
2458EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2459
2460
2461
2462
2463
2464
2465
2466
2467int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2468{
2469 int rc;
2470
2471 rc = iscsi_eh_target_reset(sc);
2472 if (rc == FAILED)
2473 rc = iscsi_eh_session_reset(sc);
2474 return rc;
2475}
2476EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2477
2478
2479
2480
2481
2482
2483
2484int
2485iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2486{
2487 int i, num_arrays = 1;
2488
2489 memset(q, 0, sizeof(*q));
2490
2491 q->max = max;
2492
2493
2494
2495 if (items)
2496 num_arrays++;
2497 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2498 if (q->pool == NULL)
2499 return -ENOMEM;
2500
2501 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2502
2503 for (i = 0; i < max; i++) {
2504 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2505 if (q->pool[i] == NULL) {
2506 q->max = i;
2507 goto enomem;
2508 }
2509 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2510 }
2511
2512 if (items) {
2513 *items = q->pool + max;
2514 memcpy(*items, q->pool, max * sizeof(void *));
2515 }
2516
2517 return 0;
2518
2519enomem:
2520 iscsi_pool_free(q);
2521 return -ENOMEM;
2522}
2523EXPORT_SYMBOL_GPL(iscsi_pool_init);
2524
2525void iscsi_pool_free(struct iscsi_pool *q)
2526{
2527 int i;
2528
2529 for (i = 0; i < q->max; i++)
2530 kfree(q->pool[i]);
2531 kfree(q->pool);
2532}
2533EXPORT_SYMBOL_GPL(iscsi_pool_free);
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2544{
2545 if (!shost->can_queue)
2546 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2547
2548 if (!shost->cmd_per_lun)
2549 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2550
2551 if (!shost->transportt->eh_timed_out)
2552 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2553 return scsi_add_host(shost, pdev);
2554}
2555EXPORT_SYMBOL_GPL(iscsi_host_add);
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2567 int dd_data_size, bool xmit_can_sleep)
2568{
2569 struct Scsi_Host *shost;
2570 struct iscsi_host *ihost;
2571
2572 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2573 if (!shost)
2574 return NULL;
2575 ihost = shost_priv(shost);
2576
2577 if (xmit_can_sleep) {
2578 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2579 "iscsi_q_%d", shost->host_no);
2580 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2581 if (!ihost->workq)
2582 goto free_host;
2583 }
2584
2585 spin_lock_init(&ihost->lock);
2586 ihost->state = ISCSI_HOST_SETUP;
2587 ihost->num_sessions = 0;
2588 init_waitqueue_head(&ihost->session_removal_wq);
2589 return shost;
2590
2591free_host:
2592 scsi_host_put(shost);
2593 return NULL;
2594}
2595EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2596
2597static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2598{
2599 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2600}
2601
2602
2603
2604
2605
2606
2607
2608
2609void iscsi_host_remove(struct Scsi_Host *shost)
2610{
2611 struct iscsi_host *ihost = shost_priv(shost);
2612 unsigned long flags;
2613
2614 spin_lock_irqsave(&ihost->lock, flags);
2615 ihost->state = ISCSI_HOST_REMOVED;
2616 spin_unlock_irqrestore(&ihost->lock, flags);
2617
2618 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2619 wait_event_interruptible(ihost->session_removal_wq,
2620 ihost->num_sessions == 0);
2621 if (signal_pending(current))
2622 flush_signals(current);
2623
2624 scsi_remove_host(shost);
2625 if (ihost->workq)
2626 destroy_workqueue(ihost->workq);
2627}
2628EXPORT_SYMBOL_GPL(iscsi_host_remove);
2629
2630void iscsi_host_free(struct Scsi_Host *shost)
2631{
2632 struct iscsi_host *ihost = shost_priv(shost);
2633
2634 kfree(ihost->netdev);
2635 kfree(ihost->hwaddress);
2636 kfree(ihost->initiatorname);
2637 scsi_host_put(shost);
2638}
2639EXPORT_SYMBOL_GPL(iscsi_host_free);
2640
2641static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2642{
2643 struct iscsi_host *ihost = shost_priv(shost);
2644 unsigned long flags;
2645
2646 shost = scsi_host_get(shost);
2647 if (!shost) {
2648 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2649 "of session teardown event because host already "
2650 "removed.\n");
2651 return;
2652 }
2653
2654 spin_lock_irqsave(&ihost->lock, flags);
2655 ihost->num_sessions--;
2656 if (ihost->num_sessions == 0)
2657 wake_up(&ihost->session_removal_wq);
2658 spin_unlock_irqrestore(&ihost->lock, flags);
2659 scsi_host_put(shost);
2660}
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677struct iscsi_cls_session *
2678iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2679 uint16_t cmds_max, int dd_size, int cmd_task_size,
2680 uint32_t initial_cmdsn, unsigned int id)
2681{
2682 struct iscsi_host *ihost = shost_priv(shost);
2683 struct iscsi_session *session;
2684 struct iscsi_cls_session *cls_session;
2685 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2686 unsigned long flags;
2687
2688 spin_lock_irqsave(&ihost->lock, flags);
2689 if (ihost->state == ISCSI_HOST_REMOVED) {
2690 spin_unlock_irqrestore(&ihost->lock, flags);
2691 return NULL;
2692 }
2693 ihost->num_sessions++;
2694 spin_unlock_irqrestore(&ihost->lock, flags);
2695
2696 if (!total_cmds)
2697 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2698
2699
2700
2701
2702
2703 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2704 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2705 "must be a power of two that is at least %d.\n",
2706 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2707 goto dec_session_count;
2708 }
2709
2710 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2711 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2712 "must be a power of 2 less than or equal to %d.\n",
2713 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2714 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2715 }
2716
2717 if (!is_power_of_2(total_cmds)) {
2718 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2719 "must be a power of 2.\n", total_cmds);
2720 total_cmds = rounddown_pow_of_two(total_cmds);
2721 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2722 return NULL;
2723 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2724 total_cmds);
2725 }
2726 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2727
2728 cls_session = iscsi_alloc_session(shost, iscsit,
2729 sizeof(struct iscsi_session) +
2730 dd_size);
2731 if (!cls_session)
2732 goto dec_session_count;
2733 session = cls_session->dd_data;
2734 session->cls_session = cls_session;
2735 session->host = shost;
2736 session->state = ISCSI_STATE_FREE;
2737 session->fast_abort = 1;
2738 session->tgt_reset_timeout = 30;
2739 session->lu_reset_timeout = 15;
2740 session->abort_timeout = 10;
2741 session->scsi_cmds_max = scsi_cmds;
2742 session->cmds_max = total_cmds;
2743 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2744 session->exp_cmdsn = initial_cmdsn + 1;
2745 session->max_cmdsn = initial_cmdsn + 1;
2746 session->max_r2t = 1;
2747 session->tt = iscsit;
2748 session->dd_data = cls_session->dd_data + sizeof(*session);
2749 mutex_init(&session->eh_mutex);
2750 spin_lock_init(&session->lock);
2751
2752
2753 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2754 (void***)&session->cmds,
2755 cmd_task_size + sizeof(struct iscsi_task)))
2756 goto cmdpool_alloc_fail;
2757
2758
2759 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2760 struct iscsi_task *task = session->cmds[cmd_i];
2761
2762 if (cmd_task_size)
2763 task->dd_data = &task[1];
2764 task->itt = cmd_i;
2765 task->state = ISCSI_TASK_FREE;
2766 INIT_LIST_HEAD(&task->running);
2767 }
2768
2769 if (!try_module_get(iscsit->owner))
2770 goto module_get_fail;
2771
2772 if (iscsi_add_session(cls_session, id))
2773 goto cls_session_fail;
2774
2775 return cls_session;
2776
2777cls_session_fail:
2778 module_put(iscsit->owner);
2779module_get_fail:
2780 iscsi_pool_free(&session->cmdpool);
2781cmdpool_alloc_fail:
2782 iscsi_free_session(cls_session);
2783dec_session_count:
2784 iscsi_host_dec_session_cnt(shost);
2785 return NULL;
2786}
2787EXPORT_SYMBOL_GPL(iscsi_session_setup);
2788
2789
2790
2791
2792
2793
2794
2795
2796void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2797{
2798 struct iscsi_session *session = cls_session->dd_data;
2799 struct module *owner = cls_session->transport->owner;
2800 struct Scsi_Host *shost = session->host;
2801
2802 iscsi_pool_free(&session->cmdpool);
2803
2804 kfree(session->password);
2805 kfree(session->password_in);
2806 kfree(session->username);
2807 kfree(session->username_in);
2808 kfree(session->targetname);
2809 kfree(session->targetalias);
2810 kfree(session->initiatorname);
2811 kfree(session->ifacename);
2812
2813 iscsi_destroy_session(cls_session);
2814 iscsi_host_dec_session_cnt(shost);
2815 module_put(owner);
2816}
2817EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2818
2819
2820
2821
2822
2823
2824
2825struct iscsi_cls_conn *
2826iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2827 uint32_t conn_idx)
2828{
2829 struct iscsi_session *session = cls_session->dd_data;
2830 struct iscsi_conn *conn;
2831 struct iscsi_cls_conn *cls_conn;
2832 char *data;
2833
2834 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2835 conn_idx);
2836 if (!cls_conn)
2837 return NULL;
2838 conn = cls_conn->dd_data;
2839 memset(conn, 0, sizeof(*conn) + dd_size);
2840
2841 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2842 conn->session = session;
2843 conn->cls_conn = cls_conn;
2844 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2845 conn->id = conn_idx;
2846 conn->exp_statsn = 0;
2847 conn->tmf_state = TMF_INITIAL;
2848
2849 init_timer(&conn->transport_timer);
2850 conn->transport_timer.data = (unsigned long)conn;
2851 conn->transport_timer.function = iscsi_check_transport_timeouts;
2852
2853 INIT_LIST_HEAD(&conn->mgmtqueue);
2854 INIT_LIST_HEAD(&conn->cmdqueue);
2855 INIT_LIST_HEAD(&conn->requeue);
2856 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2857
2858
2859 spin_lock_bh(&session->lock);
2860 if (!kfifo_out(&session->cmdpool.queue,
2861 (void*)&conn->login_task,
2862 sizeof(void*))) {
2863 spin_unlock_bh(&session->lock);
2864 goto login_task_alloc_fail;
2865 }
2866 spin_unlock_bh(&session->lock);
2867
2868 data = (char *) __get_free_pages(GFP_KERNEL,
2869 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2870 if (!data)
2871 goto login_task_data_alloc_fail;
2872 conn->login_task->data = conn->data = data;
2873
2874 init_timer(&conn->tmf_timer);
2875 init_waitqueue_head(&conn->ehwait);
2876
2877 return cls_conn;
2878
2879login_task_data_alloc_fail:
2880 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2881 sizeof(void*));
2882login_task_alloc_fail:
2883 iscsi_destroy_conn(cls_conn);
2884 return NULL;
2885}
2886EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2887
2888
2889
2890
2891
2892
2893
2894
2895void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2896{
2897 struct iscsi_conn *conn = cls_conn->dd_data;
2898 struct iscsi_session *session = conn->session;
2899 unsigned long flags;
2900
2901 del_timer_sync(&conn->transport_timer);
2902
2903 spin_lock_bh(&session->lock);
2904 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2905 if (session->leadconn == conn) {
2906
2907
2908
2909 session->state = ISCSI_STATE_TERMINATE;
2910 wake_up(&conn->ehwait);
2911 }
2912 spin_unlock_bh(&session->lock);
2913
2914
2915
2916
2917
2918 for (;;) {
2919 spin_lock_irqsave(session->host->host_lock, flags);
2920 if (!session->host->host_busy) {
2921 spin_unlock_irqrestore(session->host->host_lock, flags);
2922 break;
2923 }
2924 spin_unlock_irqrestore(session->host->host_lock, flags);
2925 msleep_interruptible(500);
2926 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2927 "host_busy %d host_failed %d\n",
2928 session->host->host_busy,
2929 session->host->host_failed);
2930
2931
2932
2933 wake_up(&conn->ehwait);
2934 }
2935
2936
2937 iscsi_suspend_tx(conn);
2938
2939 spin_lock_bh(&session->lock);
2940 free_pages((unsigned long) conn->data,
2941 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2942 kfree(conn->persistent_address);
2943 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2944 sizeof(void*));
2945 if (session->leadconn == conn)
2946 session->leadconn = NULL;
2947 spin_unlock_bh(&session->lock);
2948
2949 iscsi_destroy_conn(cls_conn);
2950}
2951EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2952
2953int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2954{
2955 struct iscsi_conn *conn = cls_conn->dd_data;
2956 struct iscsi_session *session = conn->session;
2957
2958 if (!session) {
2959 iscsi_conn_printk(KERN_ERR, conn,
2960 "can't start unbound connection\n");
2961 return -EPERM;
2962 }
2963
2964 if ((session->imm_data_en || !session->initial_r2t_en) &&
2965 session->first_burst > session->max_burst) {
2966 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2967 "first_burst %d max_burst %d\n",
2968 session->first_burst, session->max_burst);
2969 return -EINVAL;
2970 }
2971
2972 if (conn->ping_timeout && !conn->recv_timeout) {
2973 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2974 "zero. Using 5 seconds\n.");
2975 conn->recv_timeout = 5;
2976 }
2977
2978 if (conn->recv_timeout && !conn->ping_timeout) {
2979 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2980 "zero. Using 5 seconds.\n");
2981 conn->ping_timeout = 5;
2982 }
2983
2984 spin_lock_bh(&session->lock);
2985 conn->c_stage = ISCSI_CONN_STARTED;
2986 session->state = ISCSI_STATE_LOGGED_IN;
2987 session->queued_cmdsn = session->cmdsn;
2988
2989 conn->last_recv = jiffies;
2990 conn->last_ping = jiffies;
2991 if (conn->recv_timeout && conn->ping_timeout)
2992 mod_timer(&conn->transport_timer,
2993 jiffies + (conn->recv_timeout * HZ));
2994
2995 switch(conn->stop_stage) {
2996 case STOP_CONN_RECOVER:
2997
2998
2999
3000
3001 conn->stop_stage = 0;
3002 conn->tmf_state = TMF_INITIAL;
3003 session->age++;
3004 if (session->age == 16)
3005 session->age = 0;
3006 break;
3007 case STOP_CONN_TERM:
3008 conn->stop_stage = 0;
3009 break;
3010 default:
3011 break;
3012 }
3013 spin_unlock_bh(&session->lock);
3014
3015 iscsi_unblock_session(session->cls_session);
3016 wake_up(&conn->ehwait);
3017 return 0;
3018}
3019EXPORT_SYMBOL_GPL(iscsi_conn_start);
3020
3021static void
3022fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3023{
3024 struct iscsi_task *task;
3025 int i, state;
3026
3027 for (i = 0; i < conn->session->cmds_max; i++) {
3028 task = conn->session->cmds[i];
3029 if (task->sc)
3030 continue;
3031
3032 if (task->state == ISCSI_TASK_FREE)
3033 continue;
3034
3035 ISCSI_DBG_SESSION(conn->session,
3036 "failing mgmt itt 0x%x state %d\n",
3037 task->itt, task->state);
3038 state = ISCSI_TASK_ABRT_SESS_RECOV;
3039 if (task->state == ISCSI_TASK_PENDING)
3040 state = ISCSI_TASK_COMPLETED;
3041 iscsi_complete_task(task, state);
3042
3043 }
3044}
3045
3046static void iscsi_start_session_recovery(struct iscsi_session *session,
3047 struct iscsi_conn *conn, int flag)
3048{
3049 int old_stop_stage;
3050
3051 mutex_lock(&session->eh_mutex);
3052 spin_lock_bh(&session->lock);
3053 if (conn->stop_stage == STOP_CONN_TERM) {
3054 spin_unlock_bh(&session->lock);
3055 mutex_unlock(&session->eh_mutex);
3056 return;
3057 }
3058
3059
3060
3061
3062
3063
3064 if (flag == STOP_CONN_TERM)
3065 session->state = ISCSI_STATE_TERMINATE;
3066 else if (conn->stop_stage != STOP_CONN_RECOVER)
3067 session->state = ISCSI_STATE_IN_RECOVERY;
3068
3069 old_stop_stage = conn->stop_stage;
3070 conn->stop_stage = flag;
3071 spin_unlock_bh(&session->lock);
3072
3073 del_timer_sync(&conn->transport_timer);
3074 iscsi_suspend_tx(conn);
3075
3076 spin_lock_bh(&session->lock);
3077 conn->c_stage = ISCSI_CONN_STOPPED;
3078 spin_unlock_bh(&session->lock);
3079
3080
3081
3082
3083
3084
3085
3086 if (flag == STOP_CONN_RECOVER) {
3087 conn->hdrdgst_en = 0;
3088 conn->datadgst_en = 0;
3089 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3090 old_stop_stage != STOP_CONN_RECOVER) {
3091 ISCSI_DBG_SESSION(session, "blocking session\n");
3092 iscsi_block_session(session->cls_session);
3093 }
3094 }
3095
3096
3097
3098
3099 spin_lock_bh(&session->lock);
3100 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3101 fail_mgmt_tasks(session, conn);
3102 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3103 spin_unlock_bh(&session->lock);
3104 mutex_unlock(&session->eh_mutex);
3105}
3106
3107void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3108{
3109 struct iscsi_conn *conn = cls_conn->dd_data;
3110 struct iscsi_session *session = conn->session;
3111
3112 switch (flag) {
3113 case STOP_CONN_RECOVER:
3114 case STOP_CONN_TERM:
3115 iscsi_start_session_recovery(session, conn, flag);
3116 break;
3117 default:
3118 iscsi_conn_printk(KERN_ERR, conn,
3119 "invalid stop flag %d\n", flag);
3120 }
3121}
3122EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3123
3124int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3125 struct iscsi_cls_conn *cls_conn, int is_leading)
3126{
3127 struct iscsi_session *session = cls_session->dd_data;
3128 struct iscsi_conn *conn = cls_conn->dd_data;
3129
3130 spin_lock_bh(&session->lock);
3131 if (is_leading)
3132 session->leadconn = conn;
3133 spin_unlock_bh(&session->lock);
3134
3135
3136
3137
3138 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3139 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3140 return 0;
3141}
3142EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3143
3144int iscsi_switch_str_param(char **param, char *new_val_buf)
3145{
3146 char *new_val;
3147
3148 if (*param) {
3149 if (!strcmp(*param, new_val_buf))
3150 return 0;
3151 }
3152
3153 new_val = kstrdup(new_val_buf, GFP_NOIO);
3154 if (!new_val)
3155 return -ENOMEM;
3156
3157 kfree(*param);
3158 *param = new_val;
3159 return 0;
3160}
3161EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3162
3163int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3164 enum iscsi_param param, char *buf, int buflen)
3165{
3166 struct iscsi_conn *conn = cls_conn->dd_data;
3167 struct iscsi_session *session = conn->session;
3168
3169 switch(param) {
3170 case ISCSI_PARAM_FAST_ABORT:
3171 sscanf(buf, "%d", &session->fast_abort);
3172 break;
3173 case ISCSI_PARAM_ABORT_TMO:
3174 sscanf(buf, "%d", &session->abort_timeout);
3175 break;
3176 case ISCSI_PARAM_LU_RESET_TMO:
3177 sscanf(buf, "%d", &session->lu_reset_timeout);
3178 break;
3179 case ISCSI_PARAM_TGT_RESET_TMO:
3180 sscanf(buf, "%d", &session->tgt_reset_timeout);
3181 break;
3182 case ISCSI_PARAM_PING_TMO:
3183 sscanf(buf, "%d", &conn->ping_timeout);
3184 break;
3185 case ISCSI_PARAM_RECV_TMO:
3186 sscanf(buf, "%d", &conn->recv_timeout);
3187 break;
3188 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3189 sscanf(buf, "%d", &conn->max_recv_dlength);
3190 break;
3191 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3192 sscanf(buf, "%d", &conn->max_xmit_dlength);
3193 break;
3194 case ISCSI_PARAM_HDRDGST_EN:
3195 sscanf(buf, "%d", &conn->hdrdgst_en);
3196 break;
3197 case ISCSI_PARAM_DATADGST_EN:
3198 sscanf(buf, "%d", &conn->datadgst_en);
3199 break;
3200 case ISCSI_PARAM_INITIAL_R2T_EN:
3201 sscanf(buf, "%d", &session->initial_r2t_en);
3202 break;
3203 case ISCSI_PARAM_MAX_R2T:
3204 sscanf(buf, "%hu", &session->max_r2t);
3205 break;
3206 case ISCSI_PARAM_IMM_DATA_EN:
3207 sscanf(buf, "%d", &session->imm_data_en);
3208 break;
3209 case ISCSI_PARAM_FIRST_BURST:
3210 sscanf(buf, "%d", &session->first_burst);
3211 break;
3212 case ISCSI_PARAM_MAX_BURST:
3213 sscanf(buf, "%d", &session->max_burst);
3214 break;
3215 case ISCSI_PARAM_PDU_INORDER_EN:
3216 sscanf(buf, "%d", &session->pdu_inorder_en);
3217 break;
3218 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3219 sscanf(buf, "%d", &session->dataseq_inorder_en);
3220 break;
3221 case ISCSI_PARAM_ERL:
3222 sscanf(buf, "%d", &session->erl);
3223 break;
3224 case ISCSI_PARAM_EXP_STATSN:
3225 sscanf(buf, "%u", &conn->exp_statsn);
3226 break;
3227 case ISCSI_PARAM_USERNAME:
3228 return iscsi_switch_str_param(&session->username, buf);
3229 case ISCSI_PARAM_USERNAME_IN:
3230 return iscsi_switch_str_param(&session->username_in, buf);
3231 case ISCSI_PARAM_PASSWORD:
3232 return iscsi_switch_str_param(&session->password, buf);
3233 case ISCSI_PARAM_PASSWORD_IN:
3234 return iscsi_switch_str_param(&session->password_in, buf);
3235 case ISCSI_PARAM_TARGET_NAME:
3236 return iscsi_switch_str_param(&session->targetname, buf);
3237 case ISCSI_PARAM_TARGET_ALIAS:
3238 return iscsi_switch_str_param(&session->targetalias, buf);
3239 case ISCSI_PARAM_TPGT:
3240 sscanf(buf, "%d", &session->tpgt);
3241 break;
3242 case ISCSI_PARAM_PERSISTENT_PORT:
3243 sscanf(buf, "%d", &conn->persistent_port);
3244 break;
3245 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3246 return iscsi_switch_str_param(&conn->persistent_address, buf);
3247 case ISCSI_PARAM_IFACE_NAME:
3248 return iscsi_switch_str_param(&session->ifacename, buf);
3249 case ISCSI_PARAM_INITIATOR_NAME:
3250 return iscsi_switch_str_param(&session->initiatorname, buf);
3251 default:
3252 return -ENOSYS;
3253 }
3254
3255 return 0;
3256}
3257EXPORT_SYMBOL_GPL(iscsi_set_param);
3258
3259int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3260 enum iscsi_param param, char *buf)
3261{
3262 struct iscsi_session *session = cls_session->dd_data;
3263 int len;
3264
3265 switch(param) {
3266 case ISCSI_PARAM_FAST_ABORT:
3267 len = sprintf(buf, "%d\n", session->fast_abort);
3268 break;
3269 case ISCSI_PARAM_ABORT_TMO:
3270 len = sprintf(buf, "%d\n", session->abort_timeout);
3271 break;
3272 case ISCSI_PARAM_LU_RESET_TMO:
3273 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3274 break;
3275 case ISCSI_PARAM_TGT_RESET_TMO:
3276 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3277 break;
3278 case ISCSI_PARAM_INITIAL_R2T_EN:
3279 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3280 break;
3281 case ISCSI_PARAM_MAX_R2T:
3282 len = sprintf(buf, "%hu\n", session->max_r2t);
3283 break;
3284 case ISCSI_PARAM_IMM_DATA_EN:
3285 len = sprintf(buf, "%d\n", session->imm_data_en);
3286 break;
3287 case ISCSI_PARAM_FIRST_BURST:
3288 len = sprintf(buf, "%u\n", session->first_burst);
3289 break;
3290 case ISCSI_PARAM_MAX_BURST:
3291 len = sprintf(buf, "%u\n", session->max_burst);
3292 break;
3293 case ISCSI_PARAM_PDU_INORDER_EN:
3294 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3295 break;
3296 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3297 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3298 break;
3299 case ISCSI_PARAM_ERL:
3300 len = sprintf(buf, "%d\n", session->erl);
3301 break;
3302 case ISCSI_PARAM_TARGET_NAME:
3303 len = sprintf(buf, "%s\n", session->targetname);
3304 break;
3305 case ISCSI_PARAM_TARGET_ALIAS:
3306 len = sprintf(buf, "%s\n", session->targetalias);
3307 break;
3308 case ISCSI_PARAM_TPGT:
3309 len = sprintf(buf, "%d\n", session->tpgt);
3310 break;
3311 case ISCSI_PARAM_USERNAME:
3312 len = sprintf(buf, "%s\n", session->username);
3313 break;
3314 case ISCSI_PARAM_USERNAME_IN:
3315 len = sprintf(buf, "%s\n", session->username_in);
3316 break;
3317 case ISCSI_PARAM_PASSWORD:
3318 len = sprintf(buf, "%s\n", session->password);
3319 break;
3320 case ISCSI_PARAM_PASSWORD_IN:
3321 len = sprintf(buf, "%s\n", session->password_in);
3322 break;
3323 case ISCSI_PARAM_IFACE_NAME:
3324 len = sprintf(buf, "%s\n", session->ifacename);
3325 break;
3326 case ISCSI_PARAM_INITIATOR_NAME:
3327 len = sprintf(buf, "%s\n", session->initiatorname);
3328 break;
3329 default:
3330 return -ENOSYS;
3331 }
3332
3333 return len;
3334}
3335EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3336
3337int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3338 enum iscsi_param param, char *buf)
3339{
3340 struct sockaddr_in6 *sin6 = NULL;
3341 struct sockaddr_in *sin = NULL;
3342 int len;
3343
3344 switch (addr->ss_family) {
3345 case AF_INET:
3346 sin = (struct sockaddr_in *)addr;
3347 break;
3348 case AF_INET6:
3349 sin6 = (struct sockaddr_in6 *)addr;
3350 break;
3351 default:
3352 return -EINVAL;
3353 }
3354
3355 switch (param) {
3356 case ISCSI_PARAM_CONN_ADDRESS:
3357 case ISCSI_HOST_PARAM_IPADDRESS:
3358 if (sin)
3359 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3360 else
3361 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3362 break;
3363 case ISCSI_PARAM_CONN_PORT:
3364 if (sin)
3365 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3366 else
3367 len = sprintf(buf, "%hu\n",
3368 be16_to_cpu(sin6->sin6_port));
3369 break;
3370 default:
3371 return -EINVAL;
3372 }
3373
3374 return len;
3375}
3376EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3377
3378int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3379 enum iscsi_param param, char *buf)
3380{
3381 struct iscsi_conn *conn = cls_conn->dd_data;
3382 int len;
3383
3384 switch(param) {
3385 case ISCSI_PARAM_PING_TMO:
3386 len = sprintf(buf, "%u\n", conn->ping_timeout);
3387 break;
3388 case ISCSI_PARAM_RECV_TMO:
3389 len = sprintf(buf, "%u\n", conn->recv_timeout);
3390 break;
3391 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3392 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3393 break;
3394 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3395 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3396 break;
3397 case ISCSI_PARAM_HDRDGST_EN:
3398 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3399 break;
3400 case ISCSI_PARAM_DATADGST_EN:
3401 len = sprintf(buf, "%d\n", conn->datadgst_en);
3402 break;
3403 case ISCSI_PARAM_IFMARKER_EN:
3404 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3405 break;
3406 case ISCSI_PARAM_OFMARKER_EN:
3407 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3408 break;
3409 case ISCSI_PARAM_EXP_STATSN:
3410 len = sprintf(buf, "%u\n", conn->exp_statsn);
3411 break;
3412 case ISCSI_PARAM_PERSISTENT_PORT:
3413 len = sprintf(buf, "%d\n", conn->persistent_port);
3414 break;
3415 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3416 len = sprintf(buf, "%s\n", conn->persistent_address);
3417 break;
3418 default:
3419 return -ENOSYS;
3420 }
3421
3422 return len;
3423}
3424EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3425
3426int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3427 char *buf)
3428{
3429 struct iscsi_host *ihost = shost_priv(shost);
3430 int len;
3431
3432 switch (param) {
3433 case ISCSI_HOST_PARAM_NETDEV_NAME:
3434 len = sprintf(buf, "%s\n", ihost->netdev);
3435 break;
3436 case ISCSI_HOST_PARAM_HWADDRESS:
3437 len = sprintf(buf, "%s\n", ihost->hwaddress);
3438 break;
3439 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3440 len = sprintf(buf, "%s\n", ihost->initiatorname);
3441 break;
3442 default:
3443 return -ENOSYS;
3444 }
3445
3446 return len;
3447}
3448EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3449
3450int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3451 char *buf, int buflen)
3452{
3453 struct iscsi_host *ihost = shost_priv(shost);
3454
3455 switch (param) {
3456 case ISCSI_HOST_PARAM_NETDEV_NAME:
3457 return iscsi_switch_str_param(&ihost->netdev, buf);
3458 case ISCSI_HOST_PARAM_HWADDRESS:
3459 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3460 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3461 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3462 default:
3463 return -ENOSYS;
3464 }
3465
3466 return 0;
3467}
3468EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3469
3470MODULE_AUTHOR("Mike Christie");
3471MODULE_DESCRIPTION("iSCSI library functions");
3472MODULE_LICENSE("GPL");
3473