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tcp: fix lockdep splat in tcp_snd_una_update()
[linux/fpc-iii.git] / drivers / scsi / libiscsi.c
blob6bffd91b973a475d614500a077be0034dbf6786f
1 /*
2 * iSCSI lib functions
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 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
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
43 static int iscsi_dbg_lib_conn;
44 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
45 S_IRUGO | S_IWUSR);
46 MODULE_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
50 static int iscsi_dbg_lib_session;
51 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
52 S_IRUGO | S_IWUSR);
53 MODULE_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
57 static int iscsi_dbg_lib_eh;
58 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
59 S_IRUGO | S_IWUSR);
60 MODULE_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
88 inline 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 }
96 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
97
98 static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
100 {
101 /*
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
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 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
118 {
119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
120 be32_to_cpu(hdr->max_cmdsn));
121 }
122 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
123
124 /**
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
127 * @r2t: R2T info
128 * @hdr: iscsi data in pdu
129 *
130 * Notes:
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
133 *
134 * This function is called with connection lock taken.
135 **/
136 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
137 struct iscsi_data *hdr)
138 {
139 struct iscsi_conn *conn = task->conn;
140 unsigned int left = r2t->data_length - r2t->sent;
141
142 task->hdr_len = sizeof(struct iscsi_data);
143
144 memset(hdr, 0, sizeof(struct iscsi_data));
145 hdr->ttt = r2t->ttt;
146 hdr->datasn = cpu_to_be32(r2t->datasn);
147 r2t->datasn++;
148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
149 hdr->lun = task->lun;
150 hdr->itt = task->hdr_itt;
151 hdr->exp_statsn = r2t->exp_statsn;
152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
153 if (left > conn->max_xmit_dlength) {
154 hton24(hdr->dlength, conn->max_xmit_dlength);
155 r2t->data_count = conn->max_xmit_dlength;
156 hdr->flags = 0;
157 } else {
158 hton24(hdr->dlength, left);
159 r2t->data_count = left;
160 hdr->flags = ISCSI_FLAG_CMD_FINAL;
161 }
162 conn->dataout_pdus_cnt++;
163 }
164 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
165
166 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
167 {
168 unsigned exp_len = task->hdr_len + len;
169
170 if (exp_len > task->hdr_max) {
171 WARN_ON(1);
172 return -EINVAL;
173 }
174
175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
176 task->hdr_len = exp_len;
177 return 0;
178 }
179
180 /*
181 * make an extended cdb AHS
182 */
183 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
184 {
185 struct scsi_cmnd *cmd = task->sc;
186 unsigned rlen, pad_len;
187 unsigned short ahslength;
188 struct iscsi_ecdb_ahdr *ecdb_ahdr;
189 int rc;
190
191 ecdb_ahdr = iscsi_next_hdr(task);
192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
193
194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
195 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
196
197 pad_len = iscsi_padding(rlen);
198
199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
201 if (rc)
202 return rc;
203
204 if (pad_len)
205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
206
207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
209 ecdb_ahdr->reserved = 0;
210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
211
212 ISCSI_DBG_SESSION(task->conn->session,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
216 task->hdr_len);
217 return 0;
218 }
219
220 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
221 {
222 struct scsi_cmnd *sc = task->sc;
223 struct iscsi_rlength_ahdr *rlen_ahdr;
224 int rc;
225
226 rlen_ahdr = iscsi_next_hdr(task);
227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
228 if (rc)
229 return rc;
230
231 rlen_ahdr->ahslength =
232 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
233 sizeof(rlen_ahdr->reserved));
234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
235 rlen_ahdr->reserved = 0;
236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
237
238 ISCSI_DBG_SESSION(task->conn->session,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr->read_length),
242 be16_to_cpu(rlen_ahdr->ahslength));
243 return 0;
244 }
245
246 /**
247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
248 * @task: iscsi task
249 * @opcode: opcode to check for
250 *
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
255 * affected LUN.
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
258 */
259 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
260 {
261 struct iscsi_conn *conn = task->conn;
262 struct iscsi_tm *tmf = &conn->tmhdr;
263 u64 hdr_lun;
264
265 if (conn->tmf_state == TMF_INITIAL)
266 return 0;
267
268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
269 return 0;
270
271 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
273 /*
274 * Allow PDUs for unrelated LUNs
275 */
276 hdr_lun = scsilun_to_int(&tmf->lun);
277 if (hdr_lun != task->sc->device->lun)
278 return 0;
279 /* fall through */
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
281 /*
282 * Fail all SCSI cmd PDUs
283 */
284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
285 iscsi_conn_printk(KERN_INFO, conn,
286 "task [op %x/%x itt "
287 "0x%x/0x%x] "
288 "rejected.\n",
289 task->hdr->opcode, opcode,
290 task->itt, task->hdr_itt);
291 return -EACCES;
292 }
293 /*
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
296 */
297 if (conn->session->fast_abort) {
298 iscsi_conn_printk(KERN_INFO, conn,
299 "task [op %x/%x itt "
300 "0x%x/0x%x] fast abort.\n",
301 task->hdr->opcode, opcode,
302 task->itt, task->hdr_itt);
303 return -EACCES;
304 }
305 break;
306 case ISCSI_TM_FUNC_ABORT_TASK:
307 /*
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
312 */
313 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
314 task->hdr_itt == tmf->rtt) {
315 ISCSI_DBG_SESSION(conn->session,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task->itt,
319 task->hdr_itt);
320 return -EACCES;
321 }
322 break;
323 }
324
325 return 0;
326 }
327
328 /**
329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
330 * @task: iscsi task
331 *
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
334 */
335 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
336 {
337 struct iscsi_conn *conn = task->conn;
338 struct iscsi_session *session = conn->session;
339 struct scsi_cmnd *sc = task->sc;
340 struct iscsi_scsi_req *hdr;
341 unsigned hdrlength, cmd_len, transfer_length;
342 itt_t itt;
343 int rc;
344
345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
346 if (rc)
347 return rc;
348
349 if (conn->session->tt->alloc_pdu) {
350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
351 if (rc)
352 return rc;
353 }
354 hdr = (struct iscsi_scsi_req *)task->hdr;
355 itt = hdr->itt;
356 memset(hdr, 0, sizeof(*hdr));
357
358 if (session->tt->parse_pdu_itt)
359 hdr->itt = task->hdr_itt = itt;
360 else
361 hdr->itt = task->hdr_itt = build_itt(task->itt,
362 task->conn->session->age);
363 task->hdr_len = 0;
364 rc = iscsi_add_hdr(task, sizeof(*hdr));
365 if (rc)
366 return rc;
367 hdr->opcode = ISCSI_OP_SCSI_CMD;
368 hdr->flags = ISCSI_ATTR_SIMPLE;
369 int_to_scsilun(sc->device->lun, &hdr->lun);
370 task->lun = hdr->lun;
371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
372 cmd_len = sc->cmd_len;
373 if (cmd_len < ISCSI_CDB_SIZE)
374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
375 else if (cmd_len > ISCSI_CDB_SIZE) {
376 rc = iscsi_prep_ecdb_ahs(task);
377 if (rc)
378 return rc;
379 cmd_len = ISCSI_CDB_SIZE;
380 }
381 memcpy(hdr->cdb, sc->cmnd, cmd_len);
382
383 task->imm_count = 0;
384 if (scsi_bidi_cmnd(sc)) {
385 hdr->flags |= ISCSI_FLAG_CMD_READ;
386 rc = iscsi_prep_bidi_ahs(task);
387 if (rc)
388 return rc;
389 }
390
391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
392 task->protected = true;
393
394 transfer_length = scsi_transfer_length(sc);
395 hdr->data_length = cpu_to_be32(transfer_length);
396 if (sc->sc_data_direction == DMA_TO_DEVICE) {
397 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
398
399 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
400 /*
401 * Write counters:
402 *
403 * imm_count bytes to be sent right after
404 * SCSI PDU Header
405 *
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
408 * immediate data
409 *
410 * r2t data_length bytes to be sent via R2T ack's
411 *
412 * pad_count bytes to be sent as zero-padding
413 */
414 memset(r2t, 0, sizeof(*r2t));
415
416 if (session->imm_data_en) {
417 if (transfer_length >= session->first_burst)
418 task->imm_count = min(session->first_burst,
419 conn->max_xmit_dlength);
420 else
421 task->imm_count = min(transfer_length,
422 conn->max_xmit_dlength);
423 hton24(hdr->dlength, task->imm_count);
424 } else
425 zero_data(hdr->dlength);
426
427 if (!session->initial_r2t_en) {
428 r2t->data_length = min(session->first_burst,
429 transfer_length) -
430 task->imm_count;
431 r2t->data_offset = task->imm_count;
432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
434 }
435
436 if (!task->unsol_r2t.data_length)
437 /* No unsolicit Data-Out's */
438 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
439 } else {
440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 zero_data(hdr->dlength);
442
443 if (sc->sc_data_direction == DMA_FROM_DEVICE)
444 hdr->flags |= ISCSI_FLAG_CMD_READ;
445 }
446
447 /* calculate size of additional header segments (AHSs) */
448 hdrlength = task->hdr_len - sizeof(*hdr);
449
450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
451 hdrlength /= ISCSI_PAD_LEN;
452
453 WARN_ON(hdrlength >= 256);
454 hdr->hlength = hdrlength & 0xFF;
455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
456
457 if (session->tt->init_task && session->tt->init_task(task))
458 return -EIO;
459
460 task->state = ISCSI_TASK_RUNNING;
461 session->cmdsn++;
462
463 conn->scsicmd_pdus_cnt++;
464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc) ? "bidirectional" :
467 sc->sc_data_direction == DMA_TO_DEVICE ?
468 "write" : "read", conn->id, sc, sc->cmnd[0],
469 task->itt, transfer_length,
470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
471 session->cmdsn,
472 session->max_cmdsn - session->exp_cmdsn + 1);
473 return 0;
474 }
475
476 /**
477 * iscsi_free_task - free a task
478 * @task: iscsi cmd task
479 *
480 * Must be called with session back_lock.
481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
483 */
484 static void iscsi_free_task(struct iscsi_task *task)
485 {
486 struct iscsi_conn *conn = task->conn;
487 struct iscsi_session *session = conn->session;
488 struct scsi_cmnd *sc = task->sc;
489 int oldstate = task->state;
490
491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
492 task->itt, task->state, task->sc);
493
494 session->tt->cleanup_task(task);
495 task->state = ISCSI_TASK_FREE;
496 task->sc = NULL;
497 /*
498 * login task is preallocated so do not free
499 */
500 if (conn->login_task == task)
501 return;
502
503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
504
505 if (sc) {
506 /* SCSI eh reuses commands to verify us */
507 sc->SCp.ptr = NULL;
508 /*
509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
511 */
512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
513 sc->scsi_done(sc);
514 }
515 }
516
517 void __iscsi_get_task(struct iscsi_task *task)
518 {
519 atomic_inc(&task->refcount);
520 }
521 EXPORT_SYMBOL_GPL(__iscsi_get_task);
522
523 void __iscsi_put_task(struct iscsi_task *task)
524 {
525 if (atomic_dec_and_test(&task->refcount))
526 iscsi_free_task(task);
527 }
528 EXPORT_SYMBOL_GPL(__iscsi_put_task);
529
530 void iscsi_put_task(struct iscsi_task *task)
531 {
532 struct iscsi_session *session = task->conn->session;
533
534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session->back_lock);
536 __iscsi_put_task(task);
537 spin_unlock_bh(&session->back_lock);
538 }
539 EXPORT_SYMBOL_GPL(iscsi_put_task);
540
541 /**
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
544 * @state: state to complete task with
545 *
546 * Must be called with session back_lock.
547 */
548 static void iscsi_complete_task(struct iscsi_task *task, int state)
549 {
550 struct iscsi_conn *conn = task->conn;
551
552 ISCSI_DBG_SESSION(conn->session,
553 "complete task itt 0x%x state %d sc %p\n",
554 task->itt, task->state, task->sc);
555 if (task->state == ISCSI_TASK_COMPLETED ||
556 task->state == ISCSI_TASK_ABRT_TMF ||
557 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
558 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
559 return;
560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
561 task->state = state;
562
563 if (!list_empty(&task->running))
564 list_del_init(&task->running);
565
566 if (conn->task == task)
567 conn->task = NULL;
568
569 if (conn->ping_task == task)
570 conn->ping_task = NULL;
571
572 /* release get from queueing */
573 __iscsi_put_task(task);
574 }
575
576 /**
577 * iscsi_complete_scsi_task - finish scsi task normally
578 * @task: iscsi task for scsi cmd
579 * @exp_cmdsn: expected cmd sn in cpu format
580 * @max_cmdsn: max cmd sn in cpu format
581 *
582 * This is used when drivers do not need or cannot perform
583 * lower level pdu processing.
584 *
585 * Called with session back_lock
586 */
587 void iscsi_complete_scsi_task(struct iscsi_task *task,
588 uint32_t exp_cmdsn, uint32_t max_cmdsn)
589 {
590 struct iscsi_conn *conn = task->conn;
591
592 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
593
594 conn->last_recv = jiffies;
595 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
596 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
597 }
598 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
599
600
601 /*
602 * session back_lock must be held and if not called for a task that is
603 * still pending or from the xmit thread, then xmit thread must
604 * be suspended.
605 */
606 static void fail_scsi_task(struct iscsi_task *task, int err)
607 {
608 struct iscsi_conn *conn = task->conn;
609 struct scsi_cmnd *sc;
610 int state;
611
612 /*
613 * if a command completes and we get a successful tmf response
614 * we will hit this because the scsi eh abort code does not take
615 * a ref to the task.
616 */
617 sc = task->sc;
618 if (!sc)
619 return;
620
621 if (task->state == ISCSI_TASK_PENDING) {
622 /*
623 * cmd never made it to the xmit thread, so we should not count
624 * the cmd in the sequencing
625 */
626 conn->session->queued_cmdsn--;
627 /* it was never sent so just complete like normal */
628 state = ISCSI_TASK_COMPLETED;
629 } else if (err == DID_TRANSPORT_DISRUPTED)
630 state = ISCSI_TASK_ABRT_SESS_RECOV;
631 else
632 state = ISCSI_TASK_ABRT_TMF;
633
634 sc->result = err << 16;
635 if (!scsi_bidi_cmnd(sc))
636 scsi_set_resid(sc, scsi_bufflen(sc));
637 else {
638 scsi_out(sc)->resid = scsi_out(sc)->length;
639 scsi_in(sc)->resid = scsi_in(sc)->length;
640 }
641
642 /* regular RX path uses back_lock */
643 spin_lock_bh(&conn->session->back_lock);
644 iscsi_complete_task(task, state);
645 spin_unlock_bh(&conn->session->back_lock);
646 }
647
648 static 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 * pre-format CmdSN for outgoing PDU.
663 */
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
666 /*
667 * TODO: We always use immediate for normal session pdus.
668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
670 *
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
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
694 static 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 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
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 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
721 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
722 return NULL;
723 }
724
725 task = conn->login_task;
726 } else {
727 if (session->state != ISCSI_STATE_LOGGED_IN)
728 return NULL;
729
730 if (data_size != 0) {
731 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
732 return NULL;
733 }
734
735 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
736 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
737
738 if (!kfifo_out(&session->cmdpool.queue,
739 (void*)&task, sizeof(void*)))
740 return NULL;
741 }
742 /*
743 * released in complete pdu for task we expect a response for, and
744 * released by the lld when it has transmitted the task for
745 * pdus we do not expect a response for.
746 */
747 atomic_set(&task->refcount, 1);
748 task->conn = conn;
749 task->sc = NULL;
750 INIT_LIST_HEAD(&task->running);
751 task->state = ISCSI_TASK_PENDING;
752
753 if (data_size) {
754 memcpy(task->data, data, data_size);
755 task->data_count = data_size;
756 } else
757 task->data_count = 0;
758
759 if (conn->session->tt->alloc_pdu) {
760 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
761 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
762 "pdu for mgmt task.\n");
763 goto free_task;
764 }
765 }
766
767 itt = task->hdr->itt;
768 task->hdr_len = sizeof(struct iscsi_hdr);
769 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
770
771 if (hdr->itt != RESERVED_ITT) {
772 if (session->tt->parse_pdu_itt)
773 task->hdr->itt = itt;
774 else
775 task->hdr->itt = build_itt(task->itt,
776 task->conn->session->age);
777 }
778
779 if (!ihost->workq) {
780 if (iscsi_prep_mgmt_task(conn, task))
781 goto free_task;
782
783 if (session->tt->xmit_task(task))
784 goto free_task;
785 } else {
786 list_add_tail(&task->running, &conn->mgmtqueue);
787 iscsi_conn_queue_work(conn);
788 }
789
790 return task;
791
792 free_task:
793 /* regular RX path uses back_lock */
794 spin_lock_bh(&session->back_lock);
795 __iscsi_put_task(task);
796 spin_unlock_bh(&session->back_lock);
797 return NULL;
798 }
799
800 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
801 char *data, uint32_t data_size)
802 {
803 struct iscsi_conn *conn = cls_conn->dd_data;
804 struct iscsi_session *session = conn->session;
805 int err = 0;
806
807 spin_lock_bh(&session->frwd_lock);
808 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
809 err = -EPERM;
810 spin_unlock_bh(&session->frwd_lock);
811 return err;
812 }
813 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
814
815 /**
816 * iscsi_cmd_rsp - SCSI Command Response processing
817 * @conn: iscsi connection
818 * @hdr: iscsi header
819 * @task: scsi command task
820 * @data: cmd data buffer
821 * @datalen: len of buffer
822 *
823 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
824 * then completes the command and task.
825 **/
826 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
827 struct iscsi_task *task, char *data,
828 int datalen)
829 {
830 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
831 struct iscsi_session *session = conn->session;
832 struct scsi_cmnd *sc = task->sc;
833
834 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
835 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
836
837 sc->result = (DID_OK << 16) | rhdr->cmd_status;
838
839 if (task->protected) {
840 sector_t sector;
841 u8 ascq;
842
843 /**
844 * Transports that didn't implement check_protection
845 * callback but still published T10-PI support to scsi-mid
846 * deserve this BUG_ON.
847 **/
848 BUG_ON(!session->tt->check_protection);
849
850 ascq = session->tt->check_protection(task, &sector);
851 if (ascq) {
852 sc->result = DRIVER_SENSE << 24 |
853 SAM_STAT_CHECK_CONDITION;
854 scsi_build_sense_buffer(1, sc->sense_buffer,
855 ILLEGAL_REQUEST, 0x10, ascq);
856 scsi_set_sense_information(sc->sense_buffer,
857 SCSI_SENSE_BUFFERSIZE,
858 sector);
859 goto out;
860 }
861 }
862
863 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
864 sc->result = DID_ERROR << 16;
865 goto out;
866 }
867
868 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
869 uint16_t senselen;
870
871 if (datalen < 2) {
872 invalid_datalen:
873 iscsi_conn_printk(KERN_ERR, conn,
874 "Got CHECK_CONDITION but invalid data "
875 "buffer size of %d\n", datalen);
876 sc->result = DID_BAD_TARGET << 16;
877 goto out;
878 }
879
880 senselen = get_unaligned_be16(data);
881 if (datalen < senselen)
882 goto invalid_datalen;
883
884 memcpy(sc->sense_buffer, data + 2,
885 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
886 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
887 min_t(uint16_t, senselen,
888 SCSI_SENSE_BUFFERSIZE));
889 }
890
891 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
892 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
893 int res_count = be32_to_cpu(rhdr->bi_residual_count);
894
895 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
896 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
897 res_count <= scsi_in(sc)->length))
898 scsi_in(sc)->resid = res_count;
899 else
900 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
901 }
902
903 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
904 ISCSI_FLAG_CMD_OVERFLOW)) {
905 int res_count = be32_to_cpu(rhdr->residual_count);
906
907 if (res_count > 0 &&
908 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
909 res_count <= scsi_bufflen(sc)))
910 /* write side for bidi or uni-io set_resid */
911 scsi_set_resid(sc, res_count);
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
914 }
915 out:
916 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
917 sc, sc->result, task->itt);
918 conn->scsirsp_pdus_cnt++;
919 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
920 }
921
922 /**
923 * iscsi_data_in_rsp - SCSI Data-In Response processing
924 * @conn: iscsi connection
925 * @hdr: iscsi pdu
926 * @task: scsi command task
927 **/
928 static void
929 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
930 struct iscsi_task *task)
931 {
932 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
933 struct scsi_cmnd *sc = task->sc;
934
935 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
936 return;
937
938 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
939 sc->result = (DID_OK << 16) | rhdr->cmd_status;
940 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
941 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
942 ISCSI_FLAG_DATA_OVERFLOW)) {
943 int res_count = be32_to_cpu(rhdr->residual_count);
944
945 if (res_count > 0 &&
946 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
947 res_count <= scsi_in(sc)->length))
948 scsi_in(sc)->resid = res_count;
949 else
950 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
951 }
952
953 ISCSI_DBG_SESSION(conn->session, "data in with status done "
954 "[sc %p res %d itt 0x%x]\n",
955 sc, sc->result, task->itt);
956 conn->scsirsp_pdus_cnt++;
957 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
958 }
959
960 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
961 {
962 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
963
964 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
965 conn->tmfrsp_pdus_cnt++;
966
967 if (conn->tmf_state != TMF_QUEUED)
968 return;
969
970 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
971 conn->tmf_state = TMF_SUCCESS;
972 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
973 conn->tmf_state = TMF_NOT_FOUND;
974 else
975 conn->tmf_state = TMF_FAILED;
976 wake_up(&conn->ehwait);
977 }
978
979 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
980 {
981 struct iscsi_nopout hdr;
982 struct iscsi_task *task;
983
984 if (!rhdr && conn->ping_task)
985 return -EINVAL;
986
987 memset(&hdr, 0, sizeof(struct iscsi_nopout));
988 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
989 hdr.flags = ISCSI_FLAG_CMD_FINAL;
990
991 if (rhdr) {
992 hdr.lun = rhdr->lun;
993 hdr.ttt = rhdr->ttt;
994 hdr.itt = RESERVED_ITT;
995 } else
996 hdr.ttt = RESERVED_ITT;
997
998 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
999 if (!task) {
1000 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1001 return -EIO;
1002 } else if (!rhdr) {
1003 /* only track our nops */
1004 conn->ping_task = task;
1005 conn->last_ping = jiffies;
1006 }
1007
1008 return 0;
1009 }
1010
1011 static int iscsi_nop_out_rsp(struct iscsi_task *task,
1012 struct iscsi_nopin *nop, char *data, int datalen)
1013 {
1014 struct iscsi_conn *conn = task->conn;
1015 int rc = 0;
1016
1017 if (conn->ping_task != task) {
1018 /*
1019 * If this is not in response to one of our
1020 * nops then it must be from userspace.
1021 */
1022 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1023 data, datalen))
1024 rc = ISCSI_ERR_CONN_FAILED;
1025 } else
1026 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1027 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1028 return rc;
1029 }
1030
1031 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1032 char *data, int datalen)
1033 {
1034 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1035 struct iscsi_hdr rejected_pdu;
1036 int opcode, rc = 0;
1037
1038 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1039
1040 if (ntoh24(reject->dlength) > datalen ||
1041 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1042 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1043 "pdu. Invalid data length (pdu dlength "
1044 "%u, datalen %d\n", ntoh24(reject->dlength),
1045 datalen);
1046 return ISCSI_ERR_PROTO;
1047 }
1048 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1049 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1050
1051 switch (reject->reason) {
1052 case ISCSI_REASON_DATA_DIGEST_ERROR:
1053 iscsi_conn_printk(KERN_ERR, conn,
1054 "pdu (op 0x%x itt 0x%x) rejected "
1055 "due to DataDigest error.\n",
1056 opcode, rejected_pdu.itt);
1057 break;
1058 case ISCSI_REASON_IMM_CMD_REJECT:
1059 iscsi_conn_printk(KERN_ERR, conn,
1060 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1061 "immediate commands.\n",
1062 opcode, rejected_pdu.itt);
1063 /*
1064 * We only send one TMF at a time so if the target could not
1065 * handle it, then it should get fixed (RFC mandates that
1066 * a target can handle one immediate TMF per conn).
1067 *
1068 * For nops-outs, we could have sent more than one if
1069 * the target is sending us lots of nop-ins
1070 */
1071 if (opcode != ISCSI_OP_NOOP_OUT)
1072 return 0;
1073
1074 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1075 /*
1076 * nop-out in response to target's nop-out rejected.
1077 * Just resend.
1078 */
1079 /* In RX path we are under back lock */
1080 spin_unlock(&conn->session->back_lock);
1081 spin_lock(&conn->session->frwd_lock);
1082 iscsi_send_nopout(conn,
1083 (struct iscsi_nopin*)&rejected_pdu);
1084 spin_unlock(&conn->session->frwd_lock);
1085 spin_lock(&conn->session->back_lock);
1086 } else {
1087 struct iscsi_task *task;
1088 /*
1089 * Our nop as ping got dropped. We know the target
1090 * and transport are ok so just clean up
1091 */
1092 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1093 if (!task) {
1094 iscsi_conn_printk(KERN_ERR, conn,
1095 "Invalid pdu reject. Could "
1096 "not lookup rejected task.\n");
1097 rc = ISCSI_ERR_BAD_ITT;
1098 } else
1099 rc = iscsi_nop_out_rsp(task,
1100 (struct iscsi_nopin*)&rejected_pdu,
1101 NULL, 0);
1102 }
1103 break;
1104 default:
1105 iscsi_conn_printk(KERN_ERR, conn,
1106 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1107 "code 0x%x\n", rejected_pdu.opcode,
1108 rejected_pdu.itt, reject->reason);
1109 break;
1110 }
1111 return rc;
1112 }
1113
1114 /**
1115 * iscsi_itt_to_task - look up task by itt
1116 * @conn: iscsi connection
1117 * @itt: itt
1118 *
1119 * This should be used for mgmt tasks like login and nops, or if
1120 * the LDD's itt space does not include the session age.
1121 *
1122 * The session back_lock must be held.
1123 */
1124 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1125 {
1126 struct iscsi_session *session = conn->session;
1127 int i;
1128
1129 if (itt == RESERVED_ITT)
1130 return NULL;
1131
1132 if (session->tt->parse_pdu_itt)
1133 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1134 else
1135 i = get_itt(itt);
1136 if (i >= session->cmds_max)
1137 return NULL;
1138
1139 return session->cmds[i];
1140 }
1141 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1142
1143 /**
1144 * __iscsi_complete_pdu - complete pdu
1145 * @conn: iscsi conn
1146 * @hdr: iscsi header
1147 * @data: data buffer
1148 * @datalen: len of data buffer
1149 *
1150 * Completes pdu processing by freeing any resources allocated at
1151 * queuecommand or send generic. session back_lock must be held and verify
1152 * itt must have been called.
1153 */
1154 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1155 char *data, int datalen)
1156 {
1157 struct iscsi_session *session = conn->session;
1158 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1159 struct iscsi_task *task;
1160 uint32_t itt;
1161
1162 conn->last_recv = jiffies;
1163 rc = iscsi_verify_itt(conn, hdr->itt);
1164 if (rc)
1165 return rc;
1166
1167 if (hdr->itt != RESERVED_ITT)
1168 itt = get_itt(hdr->itt);
1169 else
1170 itt = ~0U;
1171
1172 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1173 opcode, conn->id, itt, datalen);
1174
1175 if (itt == ~0U) {
1176 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1177
1178 switch(opcode) {
1179 case ISCSI_OP_NOOP_IN:
1180 if (datalen) {
1181 rc = ISCSI_ERR_PROTO;
1182 break;
1183 }
1184
1185 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1186 break;
1187
1188 /* In RX path we are under back lock */
1189 spin_unlock(&session->back_lock);
1190 spin_lock(&session->frwd_lock);
1191 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1192 spin_unlock(&session->frwd_lock);
1193 spin_lock(&session->back_lock);
1194 break;
1195 case ISCSI_OP_REJECT:
1196 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1197 break;
1198 case ISCSI_OP_ASYNC_EVENT:
1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1200 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1201 rc = ISCSI_ERR_CONN_FAILED;
1202 break;
1203 default:
1204 rc = ISCSI_ERR_BAD_OPCODE;
1205 break;
1206 }
1207 goto out;
1208 }
1209
1210 switch(opcode) {
1211 case ISCSI_OP_SCSI_CMD_RSP:
1212 case ISCSI_OP_SCSI_DATA_IN:
1213 task = iscsi_itt_to_ctask(conn, hdr->itt);
1214 if (!task)
1215 return ISCSI_ERR_BAD_ITT;
1216 task->last_xfer = jiffies;
1217 break;
1218 case ISCSI_OP_R2T:
1219 /*
1220 * LLD handles R2Ts if they need to.
1221 */
1222 return 0;
1223 case ISCSI_OP_LOGOUT_RSP:
1224 case ISCSI_OP_LOGIN_RSP:
1225 case ISCSI_OP_TEXT_RSP:
1226 case ISCSI_OP_SCSI_TMFUNC_RSP:
1227 case ISCSI_OP_NOOP_IN:
1228 task = iscsi_itt_to_task(conn, hdr->itt);
1229 if (!task)
1230 return ISCSI_ERR_BAD_ITT;
1231 break;
1232 default:
1233 return ISCSI_ERR_BAD_OPCODE;
1234 }
1235
1236 switch(opcode) {
1237 case ISCSI_OP_SCSI_CMD_RSP:
1238 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1239 break;
1240 case ISCSI_OP_SCSI_DATA_IN:
1241 iscsi_data_in_rsp(conn, hdr, task);
1242 break;
1243 case ISCSI_OP_LOGOUT_RSP:
1244 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1245 if (datalen) {
1246 rc = ISCSI_ERR_PROTO;
1247 break;
1248 }
1249 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1250 goto recv_pdu;
1251 case ISCSI_OP_LOGIN_RSP:
1252 case ISCSI_OP_TEXT_RSP:
1253 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1254 /*
1255 * login related PDU's exp_statsn is handled in
1256 * userspace
1257 */
1258 goto recv_pdu;
1259 case ISCSI_OP_SCSI_TMFUNC_RSP:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 if (datalen) {
1262 rc = ISCSI_ERR_PROTO;
1263 break;
1264 }
1265
1266 iscsi_tmf_rsp(conn, hdr);
1267 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1268 break;
1269 case ISCSI_OP_NOOP_IN:
1270 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1271 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1272 rc = ISCSI_ERR_PROTO;
1273 break;
1274 }
1275 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1276
1277 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1278 data, datalen);
1279 break;
1280 default:
1281 rc = ISCSI_ERR_BAD_OPCODE;
1282 break;
1283 }
1284
1285 out:
1286 return rc;
1287 recv_pdu:
1288 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1289 rc = ISCSI_ERR_CONN_FAILED;
1290 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1291 return rc;
1292 }
1293 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1294
1295 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1296 char *data, int datalen)
1297 {
1298 int rc;
1299
1300 spin_lock(&conn->session->back_lock);
1301 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1302 spin_unlock(&conn->session->back_lock);
1303 return rc;
1304 }
1305 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1306
1307 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1308 {
1309 struct iscsi_session *session = conn->session;
1310 int age = 0, i = 0;
1311
1312 if (itt == RESERVED_ITT)
1313 return 0;
1314
1315 if (session->tt->parse_pdu_itt)
1316 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1317 else {
1318 i = get_itt(itt);
1319 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1320 }
1321
1322 if (age != session->age) {
1323 iscsi_conn_printk(KERN_ERR, conn,
1324 "received itt %x expected session age (%x)\n",
1325 (__force u32)itt, session->age);
1326 return ISCSI_ERR_BAD_ITT;
1327 }
1328
1329 if (i >= session->cmds_max) {
1330 iscsi_conn_printk(KERN_ERR, conn,
1331 "received invalid itt index %u (max cmds "
1332 "%u.\n", i, session->cmds_max);
1333 return ISCSI_ERR_BAD_ITT;
1334 }
1335 return 0;
1336 }
1337 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1338
1339 /**
1340 * iscsi_itt_to_ctask - look up ctask by itt
1341 * @conn: iscsi connection
1342 * @itt: itt
1343 *
1344 * This should be used for cmd tasks.
1345 *
1346 * The session back_lock must be held.
1347 */
1348 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1349 {
1350 struct iscsi_task *task;
1351
1352 if (iscsi_verify_itt(conn, itt))
1353 return NULL;
1354
1355 task = iscsi_itt_to_task(conn, itt);
1356 if (!task || !task->sc)
1357 return NULL;
1358
1359 if (task->sc->SCp.phase != conn->session->age) {
1360 iscsi_session_printk(KERN_ERR, conn->session,
1361 "task's session age %d, expected %d\n",
1362 task->sc->SCp.phase, conn->session->age);
1363 return NULL;
1364 }
1365
1366 return task;
1367 }
1368 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1369
1370 void iscsi_session_failure(struct iscsi_session *session,
1371 enum iscsi_err err)
1372 {
1373 struct iscsi_conn *conn;
1374 struct device *dev;
1375
1376 spin_lock_bh(&session->frwd_lock);
1377 conn = session->leadconn;
1378 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1379 spin_unlock_bh(&session->frwd_lock);
1380 return;
1381 }
1382
1383 dev = get_device(&conn->cls_conn->dev);
1384 spin_unlock_bh(&session->frwd_lock);
1385 if (!dev)
1386 return;
1387 /*
1388 * if the host is being removed bypass the connection
1389 * recovery initialization because we are going to kill
1390 * the session.
1391 */
1392 if (err == ISCSI_ERR_INVALID_HOST)
1393 iscsi_conn_error_event(conn->cls_conn, err);
1394 else
1395 iscsi_conn_failure(conn, err);
1396 put_device(dev);
1397 }
1398 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1399
1400 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1401 {
1402 struct iscsi_session *session = conn->session;
1403
1404 spin_lock_bh(&session->frwd_lock);
1405 if (session->state == ISCSI_STATE_FAILED) {
1406 spin_unlock_bh(&session->frwd_lock);
1407 return;
1408 }
1409
1410 if (conn->stop_stage == 0)
1411 session->state = ISCSI_STATE_FAILED;
1412 spin_unlock_bh(&session->frwd_lock);
1413
1414 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1415 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1416 iscsi_conn_error_event(conn->cls_conn, err);
1417 }
1418 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1419
1420 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1421 {
1422 struct iscsi_session *session = conn->session;
1423
1424 /*
1425 * Check for iSCSI window and take care of CmdSN wrap-around
1426 */
1427 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1428 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1429 "%u MaxCmdSN %u CmdSN %u/%u\n",
1430 session->exp_cmdsn, session->max_cmdsn,
1431 session->cmdsn, session->queued_cmdsn);
1432 return -ENOSPC;
1433 }
1434 return 0;
1435 }
1436
1437 static int iscsi_xmit_task(struct iscsi_conn *conn)
1438 {
1439 struct iscsi_task *task = conn->task;
1440 int rc;
1441
1442 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1443 return -ENODATA;
1444
1445 __iscsi_get_task(task);
1446 spin_unlock_bh(&conn->session->frwd_lock);
1447 rc = conn->session->tt->xmit_task(task);
1448 spin_lock_bh(&conn->session->frwd_lock);
1449 if (!rc) {
1450 /* done with this task */
1451 task->last_xfer = jiffies;
1452 conn->task = NULL;
1453 }
1454 /* regular RX path uses back_lock */
1455 spin_lock(&conn->session->back_lock);
1456 __iscsi_put_task(task);
1457 spin_unlock(&conn->session->back_lock);
1458 return rc;
1459 }
1460
1461 /**
1462 * iscsi_requeue_task - requeue task to run from session workqueue
1463 * @task: task to requeue
1464 *
1465 * LLDs that need to run a task from the session workqueue should call
1466 * this. The session frwd_lock must be held. This should only be called
1467 * by software drivers.
1468 */
1469 void iscsi_requeue_task(struct iscsi_task *task)
1470 {
1471 struct iscsi_conn *conn = task->conn;
1472
1473 /*
1474 * this may be on the requeue list already if the xmit_task callout
1475 * is handling the r2ts while we are adding new ones
1476 */
1477 if (list_empty(&task->running))
1478 list_add_tail(&task->running, &conn->requeue);
1479 iscsi_conn_queue_work(conn);
1480 }
1481 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1482
1483 /**
1484 * iscsi_data_xmit - xmit any command into the scheduled connection
1485 * @conn: iscsi connection
1486 *
1487 * Notes:
1488 * The function can return -EAGAIN in which case the caller must
1489 * re-schedule it again later or recover. '0' return code means
1490 * successful xmit.
1491 **/
1492 static int iscsi_data_xmit(struct iscsi_conn *conn)
1493 {
1494 struct iscsi_task *task;
1495 int rc = 0;
1496
1497 spin_lock_bh(&conn->session->frwd_lock);
1498 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1499 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1500 spin_unlock_bh(&conn->session->frwd_lock);
1501 return -ENODATA;
1502 }
1503
1504 if (conn->task) {
1505 rc = iscsi_xmit_task(conn);
1506 if (rc)
1507 goto done;
1508 }
1509
1510 /*
1511 * process mgmt pdus like nops before commands since we should
1512 * only have one nop-out as a ping from us and targets should not
1513 * overflow us with nop-ins
1514 */
1515 check_mgmt:
1516 while (!list_empty(&conn->mgmtqueue)) {
1517 conn->task = list_entry(conn->mgmtqueue.next,
1518 struct iscsi_task, running);
1519 list_del_init(&conn->task->running);
1520 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1521 /* regular RX path uses back_lock */
1522 spin_lock_bh(&conn->session->back_lock);
1523 __iscsi_put_task(conn->task);
1524 spin_unlock_bh(&conn->session->back_lock);
1525 conn->task = NULL;
1526 continue;
1527 }
1528 rc = iscsi_xmit_task(conn);
1529 if (rc)
1530 goto done;
1531 }
1532
1533 /* process pending command queue */
1534 while (!list_empty(&conn->cmdqueue)) {
1535 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1536 running);
1537 list_del_init(&conn->task->running);
1538 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1539 fail_scsi_task(conn->task, DID_IMM_RETRY);
1540 continue;
1541 }
1542 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1543 if (rc) {
1544 if (rc == -ENOMEM || rc == -EACCES) {
1545 list_add_tail(&conn->task->running,
1546 &conn->cmdqueue);
1547 conn->task = NULL;
1548 goto done;
1549 } else
1550 fail_scsi_task(conn->task, DID_ABORT);
1551 continue;
1552 }
1553 rc = iscsi_xmit_task(conn);
1554 if (rc)
1555 goto done;
1556 /*
1557 * we could continuously get new task requests so
1558 * we need to check the mgmt queue for nops that need to
1559 * be sent to aviod starvation
1560 */
1561 if (!list_empty(&conn->mgmtqueue))
1562 goto check_mgmt;
1563 }
1564
1565 while (!list_empty(&conn->requeue)) {
1566 /*
1567 * we always do fastlogout - conn stop code will clean up.
1568 */
1569 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1570 break;
1571
1572 task = list_entry(conn->requeue.next, struct iscsi_task,
1573 running);
1574 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1575 break;
1576
1577 conn->task = task;
1578 list_del_init(&conn->task->running);
1579 conn->task->state = ISCSI_TASK_RUNNING;
1580 rc = iscsi_xmit_task(conn);
1581 if (rc)
1582 goto done;
1583 if (!list_empty(&conn->mgmtqueue))
1584 goto check_mgmt;
1585 }
1586 spin_unlock_bh(&conn->session->frwd_lock);
1587 return -ENODATA;
1588
1589 done:
1590 spin_unlock_bh(&conn->session->frwd_lock);
1591 return rc;
1592 }
1593
1594 static void iscsi_xmitworker(struct work_struct *work)
1595 {
1596 struct iscsi_conn *conn =
1597 container_of(work, struct iscsi_conn, xmitwork);
1598 int rc;
1599 /*
1600 * serialize Xmit worker on a per-connection basis.
1601 */
1602 do {
1603 rc = iscsi_data_xmit(conn);
1604 } while (rc >= 0 || rc == -EAGAIN);
1605 }
1606
1607 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1608 struct scsi_cmnd *sc)
1609 {
1610 struct iscsi_task *task;
1611
1612 if (!kfifo_out(&conn->session->cmdpool.queue,
1613 (void *) &task, sizeof(void *)))
1614 return NULL;
1615
1616 sc->SCp.phase = conn->session->age;
1617 sc->SCp.ptr = (char *) task;
1618
1619 atomic_set(&task->refcount, 1);
1620 task->state = ISCSI_TASK_PENDING;
1621 task->conn = conn;
1622 task->sc = sc;
1623 task->have_checked_conn = false;
1624 task->last_timeout = jiffies;
1625 task->last_xfer = jiffies;
1626 task->protected = false;
1627 INIT_LIST_HEAD(&task->running);
1628 return task;
1629 }
1630
1631 enum {
1632 FAILURE_BAD_HOST = 1,
1633 FAILURE_SESSION_FAILED,
1634 FAILURE_SESSION_FREED,
1635 FAILURE_WINDOW_CLOSED,
1636 FAILURE_OOM,
1637 FAILURE_SESSION_TERMINATE,
1638 FAILURE_SESSION_IN_RECOVERY,
1639 FAILURE_SESSION_RECOVERY_TIMEOUT,
1640 FAILURE_SESSION_LOGGING_OUT,
1641 FAILURE_SESSION_NOT_READY,
1642 };
1643
1644 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1645 {
1646 struct iscsi_cls_session *cls_session;
1647 struct iscsi_host *ihost;
1648 int reason = 0;
1649 struct iscsi_session *session;
1650 struct iscsi_conn *conn;
1651 struct iscsi_task *task = NULL;
1652
1653 sc->result = 0;
1654 sc->SCp.ptr = NULL;
1655
1656 ihost = shost_priv(host);
1657
1658 cls_session = starget_to_session(scsi_target(sc->device));
1659 session = cls_session->dd_data;
1660 spin_lock_bh(&session->frwd_lock);
1661
1662 reason = iscsi_session_chkready(cls_session);
1663 if (reason) {
1664 sc->result = reason;
1665 goto fault;
1666 }
1667
1668 if (session->state != ISCSI_STATE_LOGGED_IN) {
1669 /*
1670 * to handle the race between when we set the recovery state
1671 * and block the session we requeue here (commands could
1672 * be entering our queuecommand while a block is starting
1673 * up because the block code is not locked)
1674 */
1675 switch (session->state) {
1676 case ISCSI_STATE_FAILED:
1677 case ISCSI_STATE_IN_RECOVERY:
1678 reason = FAILURE_SESSION_IN_RECOVERY;
1679 sc->result = DID_IMM_RETRY << 16;
1680 break;
1681 case ISCSI_STATE_LOGGING_OUT:
1682 reason = FAILURE_SESSION_LOGGING_OUT;
1683 sc->result = DID_IMM_RETRY << 16;
1684 break;
1685 case ISCSI_STATE_RECOVERY_FAILED:
1686 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1687 sc->result = DID_TRANSPORT_FAILFAST << 16;
1688 break;
1689 case ISCSI_STATE_TERMINATE:
1690 reason = FAILURE_SESSION_TERMINATE;
1691 sc->result = DID_NO_CONNECT << 16;
1692 break;
1693 default:
1694 reason = FAILURE_SESSION_FREED;
1695 sc->result = DID_NO_CONNECT << 16;
1696 }
1697 goto fault;
1698 }
1699
1700 conn = session->leadconn;
1701 if (!conn) {
1702 reason = FAILURE_SESSION_FREED;
1703 sc->result = DID_NO_CONNECT << 16;
1704 goto fault;
1705 }
1706
1707 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1708 reason = FAILURE_SESSION_IN_RECOVERY;
1709 sc->result = DID_REQUEUE;
1710 goto fault;
1711 }
1712
1713 if (iscsi_check_cmdsn_window_closed(conn)) {
1714 reason = FAILURE_WINDOW_CLOSED;
1715 goto reject;
1716 }
1717
1718 task = iscsi_alloc_task(conn, sc);
1719 if (!task) {
1720 reason = FAILURE_OOM;
1721 goto reject;
1722 }
1723
1724 if (!ihost->workq) {
1725 reason = iscsi_prep_scsi_cmd_pdu(task);
1726 if (reason) {
1727 if (reason == -ENOMEM || reason == -EACCES) {
1728 reason = FAILURE_OOM;
1729 goto prepd_reject;
1730 } else {
1731 sc->result = DID_ABORT << 16;
1732 goto prepd_fault;
1733 }
1734 }
1735 if (session->tt->xmit_task(task)) {
1736 session->cmdsn--;
1737 reason = FAILURE_SESSION_NOT_READY;
1738 goto prepd_reject;
1739 }
1740 } else {
1741 list_add_tail(&task->running, &conn->cmdqueue);
1742 iscsi_conn_queue_work(conn);
1743 }
1744
1745 session->queued_cmdsn++;
1746 spin_unlock_bh(&session->frwd_lock);
1747 return 0;
1748
1749 prepd_reject:
1750 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1751 reject:
1752 spin_unlock_bh(&session->frwd_lock);
1753 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1754 sc->cmnd[0], reason);
1755 return SCSI_MLQUEUE_TARGET_BUSY;
1756
1757 prepd_fault:
1758 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1759 fault:
1760 spin_unlock_bh(&session->frwd_lock);
1761 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1762 sc->cmnd[0], reason);
1763 if (!scsi_bidi_cmnd(sc))
1764 scsi_set_resid(sc, scsi_bufflen(sc));
1765 else {
1766 scsi_out(sc)->resid = scsi_out(sc)->length;
1767 scsi_in(sc)->resid = scsi_in(sc)->length;
1768 }
1769 sc->scsi_done(sc);
1770 return 0;
1771 }
1772 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1773
1774 int iscsi_target_alloc(struct scsi_target *starget)
1775 {
1776 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1777 struct iscsi_session *session = cls_session->dd_data;
1778
1779 starget->can_queue = session->scsi_cmds_max;
1780 return 0;
1781 }
1782 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1783
1784 static void iscsi_tmf_timedout(unsigned long data)
1785 {
1786 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1787 struct iscsi_session *session = conn->session;
1788
1789 spin_lock(&session->frwd_lock);
1790 if (conn->tmf_state == TMF_QUEUED) {
1791 conn->tmf_state = TMF_TIMEDOUT;
1792 ISCSI_DBG_EH(session, "tmf timedout\n");
1793 /* unblock eh_abort() */
1794 wake_up(&conn->ehwait);
1795 }
1796 spin_unlock(&session->frwd_lock);
1797 }
1798
1799 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1800 struct iscsi_tm *hdr, int age,
1801 int timeout)
1802 {
1803 struct iscsi_session *session = conn->session;
1804 struct iscsi_task *task;
1805
1806 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1807 NULL, 0);
1808 if (!task) {
1809 spin_unlock_bh(&session->frwd_lock);
1810 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1811 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1812 spin_lock_bh(&session->frwd_lock);
1813 return -EPERM;
1814 }
1815 conn->tmfcmd_pdus_cnt++;
1816 conn->tmf_timer.expires = timeout * HZ + jiffies;
1817 conn->tmf_timer.function = iscsi_tmf_timedout;
1818 conn->tmf_timer.data = (unsigned long)conn;
1819 add_timer(&conn->tmf_timer);
1820 ISCSI_DBG_EH(session, "tmf set timeout\n");
1821
1822 spin_unlock_bh(&session->frwd_lock);
1823 mutex_unlock(&session->eh_mutex);
1824
1825 /*
1826 * block eh thread until:
1827 *
1828 * 1) tmf response
1829 * 2) tmf timeout
1830 * 3) session is terminated or restarted or userspace has
1831 * given up on recovery
1832 */
1833 wait_event_interruptible(conn->ehwait, age != session->age ||
1834 session->state != ISCSI_STATE_LOGGED_IN ||
1835 conn->tmf_state != TMF_QUEUED);
1836 if (signal_pending(current))
1837 flush_signals(current);
1838 del_timer_sync(&conn->tmf_timer);
1839
1840 mutex_lock(&session->eh_mutex);
1841 spin_lock_bh(&session->frwd_lock);
1842 /* if the session drops it will clean up the task */
1843 if (age != session->age ||
1844 session->state != ISCSI_STATE_LOGGED_IN)
1845 return -ENOTCONN;
1846 return 0;
1847 }
1848
1849 /*
1850 * Fail commands. session lock held and recv side suspended and xmit
1851 * thread flushed
1852 */
1853 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1854 {
1855 struct iscsi_task *task;
1856 int i;
1857
1858 for (i = 0; i < conn->session->cmds_max; i++) {
1859 task = conn->session->cmds[i];
1860 if (!task->sc || task->state == ISCSI_TASK_FREE)
1861 continue;
1862
1863 if (lun != -1 && lun != task->sc->device->lun)
1864 continue;
1865
1866 ISCSI_DBG_SESSION(conn->session,
1867 "failing sc %p itt 0x%x state %d\n",
1868 task->sc, task->itt, task->state);
1869 fail_scsi_task(task, error);
1870 }
1871 }
1872
1873 /**
1874 * iscsi_suspend_queue - suspend iscsi_queuecommand
1875 * @conn: iscsi conn to stop queueing IO on
1876 *
1877 * This grabs the session frwd_lock to make sure no one is in
1878 * xmit_task/queuecommand, and then sets suspend to prevent
1879 * new commands from being queued. This only needs to be called
1880 * by offload drivers that need to sync a path like ep disconnect
1881 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1882 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1883 */
1884 void iscsi_suspend_queue(struct iscsi_conn *conn)
1885 {
1886 spin_lock_bh(&conn->session->frwd_lock);
1887 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1888 spin_unlock_bh(&conn->session->frwd_lock);
1889 }
1890 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1891
1892 /**
1893 * iscsi_suspend_tx - suspend iscsi_data_xmit
1894 * @conn: iscsi conn tp stop processing IO on.
1895 *
1896 * This function sets the suspend bit to prevent iscsi_data_xmit
1897 * from sending new IO, and if work is queued on the xmit thread
1898 * it will wait for it to be completed.
1899 */
1900 void iscsi_suspend_tx(struct iscsi_conn *conn)
1901 {
1902 struct Scsi_Host *shost = conn->session->host;
1903 struct iscsi_host *ihost = shost_priv(shost);
1904
1905 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1906 if (ihost->workq)
1907 flush_workqueue(ihost->workq);
1908 }
1909 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1910
1911 static void iscsi_start_tx(struct iscsi_conn *conn)
1912 {
1913 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1914 iscsi_conn_queue_work(conn);
1915 }
1916
1917 /*
1918 * We want to make sure a ping is in flight. It has timed out.
1919 * And we are not busy processing a pdu that is making
1920 * progress but got started before the ping and is taking a while
1921 * to complete so the ping is just stuck behind it in a queue.
1922 */
1923 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1924 {
1925 if (conn->ping_task &&
1926 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1927 (conn->ping_timeout * HZ), jiffies))
1928 return 1;
1929 else
1930 return 0;
1931 }
1932
1933 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1934 {
1935 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1936 struct iscsi_task *task = NULL, *running_task;
1937 struct iscsi_cls_session *cls_session;
1938 struct iscsi_session *session;
1939 struct iscsi_conn *conn;
1940 int i;
1941
1942 cls_session = starget_to_session(scsi_target(sc->device));
1943 session = cls_session->dd_data;
1944
1945 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1946
1947 spin_lock(&session->frwd_lock);
1948 task = (struct iscsi_task *)sc->SCp.ptr;
1949 if (!task) {
1950 /*
1951 * Raced with completion. Blk layer has taken ownership
1952 * so let timeout code complete it now.
1953 */
1954 rc = BLK_EH_HANDLED;
1955 goto done;
1956 }
1957
1958 if (session->state != ISCSI_STATE_LOGGED_IN) {
1959 /*
1960 * We are probably in the middle of iscsi recovery so let
1961 * that complete and handle the error.
1962 */
1963 rc = BLK_EH_RESET_TIMER;
1964 goto done;
1965 }
1966
1967 conn = session->leadconn;
1968 if (!conn) {
1969 /* In the middle of shuting down */
1970 rc = BLK_EH_RESET_TIMER;
1971 goto done;
1972 }
1973
1974 /*
1975 * If we have sent (at least queued to the network layer) a pdu or
1976 * recvd one for the task since the last timeout ask for
1977 * more time. If on the next timeout we have not made progress
1978 * we can check if it is the task or connection when we send the
1979 * nop as a ping.
1980 */
1981 if (time_after(task->last_xfer, task->last_timeout)) {
1982 ISCSI_DBG_EH(session, "Command making progress. Asking "
1983 "scsi-ml for more time to complete. "
1984 "Last data xfer at %lu. Last timeout was at "
1985 "%lu\n.", task->last_xfer, task->last_timeout);
1986 task->have_checked_conn = false;
1987 rc = BLK_EH_RESET_TIMER;
1988 goto done;
1989 }
1990
1991 if (!conn->recv_timeout && !conn->ping_timeout)
1992 goto done;
1993 /*
1994 * if the ping timedout then we are in the middle of cleaning up
1995 * and can let the iscsi eh handle it
1996 */
1997 if (iscsi_has_ping_timed_out(conn)) {
1998 rc = BLK_EH_RESET_TIMER;
1999 goto done;
2000 }
2001
2002 for (i = 0; i < conn->session->cmds_max; i++) {
2003 running_task = conn->session->cmds[i];
2004 if (!running_task->sc || running_task == task ||
2005 running_task->state != ISCSI_TASK_RUNNING)
2006 continue;
2007
2008 /*
2009 * Only check if cmds started before this one have made
2010 * progress, or this could never fail
2011 */
2012 if (time_after(running_task->sc->jiffies_at_alloc,
2013 task->sc->jiffies_at_alloc))
2014 continue;
2015
2016 if (time_after(running_task->last_xfer, task->last_timeout)) {
2017 /*
2018 * This task has not made progress, but a task
2019 * started before us has transferred data since
2020 * we started/last-checked. We could be queueing
2021 * too many tasks or the LU is bad.
2022 *
2023 * If the device is bad the cmds ahead of us on
2024 * other devs will complete, and this loop will
2025 * eventually fail starting the scsi eh.
2026 */
2027 ISCSI_DBG_EH(session, "Command has not made progress "
2028 "but commands ahead of it have. "
2029 "Asking scsi-ml for more time to "
2030 "complete. Our last xfer vs running task "
2031 "last xfer %lu/%lu. Last check %lu.\n",
2032 task->last_xfer, running_task->last_xfer,
2033 task->last_timeout);
2034 rc = BLK_EH_RESET_TIMER;
2035 goto done;
2036 }
2037 }
2038
2039 /* Assumes nop timeout is shorter than scsi cmd timeout */
2040 if (task->have_checked_conn)
2041 goto done;
2042
2043 /*
2044 * Checking the transport already or nop from a cmd timeout still
2045 * running
2046 */
2047 if (conn->ping_task) {
2048 task->have_checked_conn = true;
2049 rc = BLK_EH_RESET_TIMER;
2050 goto done;
2051 }
2052
2053 /* Make sure there is a transport check done */
2054 iscsi_send_nopout(conn, NULL);
2055 task->have_checked_conn = true;
2056 rc = BLK_EH_RESET_TIMER;
2057
2058 done:
2059 if (task)
2060 task->last_timeout = jiffies;
2061 spin_unlock(&session->frwd_lock);
2062 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2063 "timer reset" : "nh");
2064 return rc;
2065 }
2066
2067 static void iscsi_check_transport_timeouts(unsigned long data)
2068 {
2069 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2070 struct iscsi_session *session = conn->session;
2071 unsigned long recv_timeout, next_timeout = 0, last_recv;
2072
2073 spin_lock(&session->frwd_lock);
2074 if (session->state != ISCSI_STATE_LOGGED_IN)
2075 goto done;
2076
2077 recv_timeout = conn->recv_timeout;
2078 if (!recv_timeout)
2079 goto done;
2080
2081 recv_timeout *= HZ;
2082 last_recv = conn->last_recv;
2083
2084 if (iscsi_has_ping_timed_out(conn)) {
2085 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2086 "expired, recv timeout %d, last rx %lu, "
2087 "last ping %lu, now %lu\n",
2088 conn->ping_timeout, conn->recv_timeout,
2089 last_recv, conn->last_ping, jiffies);
2090 spin_unlock(&session->frwd_lock);
2091 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2092 return;
2093 }
2094
2095 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2096 /* send a ping to try to provoke some traffic */
2097 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2098 if (iscsi_send_nopout(conn, NULL))
2099 next_timeout = jiffies + (1 * HZ);
2100 else
2101 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2102 } else
2103 next_timeout = last_recv + recv_timeout;
2104
2105 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2106 mod_timer(&conn->transport_timer, next_timeout);
2107 done:
2108 spin_unlock(&session->frwd_lock);
2109 }
2110
2111 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2112 struct iscsi_tm *hdr)
2113 {
2114 memset(hdr, 0, sizeof(*hdr));
2115 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2116 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2117 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2118 hdr->lun = task->lun;
2119 hdr->rtt = task->hdr_itt;
2120 hdr->refcmdsn = task->cmdsn;
2121 }
2122
2123 int iscsi_eh_abort(struct scsi_cmnd *sc)
2124 {
2125 struct iscsi_cls_session *cls_session;
2126 struct iscsi_session *session;
2127 struct iscsi_conn *conn;
2128 struct iscsi_task *task;
2129 struct iscsi_tm *hdr;
2130 int rc, age;
2131
2132 cls_session = starget_to_session(scsi_target(sc->device));
2133 session = cls_session->dd_data;
2134
2135 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2136
2137 mutex_lock(&session->eh_mutex);
2138 spin_lock_bh(&session->frwd_lock);
2139 /*
2140 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2141 * got the command.
2142 */
2143 if (!sc->SCp.ptr) {
2144 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2145 "it completed.\n");
2146 spin_unlock_bh(&session->frwd_lock);
2147 mutex_unlock(&session->eh_mutex);
2148 return SUCCESS;
2149 }
2150
2151 /*
2152 * If we are not logged in or we have started a new session
2153 * then let the host reset code handle this
2154 */
2155 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2156 sc->SCp.phase != session->age) {
2157 spin_unlock_bh(&session->frwd_lock);
2158 mutex_unlock(&session->eh_mutex);
2159 ISCSI_DBG_EH(session, "failing abort due to dropped "
2160 "session.\n");
2161 return FAILED;
2162 }
2163
2164 conn = session->leadconn;
2165 conn->eh_abort_cnt++;
2166 age = session->age;
2167
2168 task = (struct iscsi_task *)sc->SCp.ptr;
2169 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2170 sc, task->itt);
2171
2172 /* task completed before time out */
2173 if (!task->sc) {
2174 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2175 goto success;
2176 }
2177
2178 if (task->state == ISCSI_TASK_PENDING) {
2179 fail_scsi_task(task, DID_ABORT);
2180 goto success;
2181 }
2182
2183 /* only have one tmf outstanding at a time */
2184 if (conn->tmf_state != TMF_INITIAL)
2185 goto failed;
2186 conn->tmf_state = TMF_QUEUED;
2187
2188 hdr = &conn->tmhdr;
2189 iscsi_prep_abort_task_pdu(task, hdr);
2190
2191 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2192 rc = FAILED;
2193 goto failed;
2194 }
2195
2196 switch (conn->tmf_state) {
2197 case TMF_SUCCESS:
2198 spin_unlock_bh(&session->frwd_lock);
2199 /*
2200 * stop tx side incase the target had sent a abort rsp but
2201 * the initiator was still writing out data.
2202 */
2203 iscsi_suspend_tx(conn);
2204 /*
2205 * we do not stop the recv side because targets have been
2206 * good and have never sent us a successful tmf response
2207 * then sent more data for the cmd.
2208 */
2209 spin_lock_bh(&session->frwd_lock);
2210 fail_scsi_task(task, DID_ABORT);
2211 conn->tmf_state = TMF_INITIAL;
2212 memset(hdr, 0, sizeof(*hdr));
2213 spin_unlock_bh(&session->frwd_lock);
2214 iscsi_start_tx(conn);
2215 goto success_unlocked;
2216 case TMF_TIMEDOUT:
2217 spin_unlock_bh(&session->frwd_lock);
2218 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2219 goto failed_unlocked;
2220 case TMF_NOT_FOUND:
2221 if (!sc->SCp.ptr) {
2222 conn->tmf_state = TMF_INITIAL;
2223 memset(hdr, 0, sizeof(*hdr));
2224 /* task completed before tmf abort response */
2225 ISCSI_DBG_EH(session, "sc completed while abort in "
2226 "progress\n");
2227 goto success;
2228 }
2229 /* fall through */
2230 default:
2231 conn->tmf_state = TMF_INITIAL;
2232 goto failed;
2233 }
2234
2235 success:
2236 spin_unlock_bh(&session->frwd_lock);
2237 success_unlocked:
2238 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2239 sc, task->itt);
2240 mutex_unlock(&session->eh_mutex);
2241 return SUCCESS;
2242
2243 failed:
2244 spin_unlock_bh(&session->frwd_lock);
2245 failed_unlocked:
2246 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2247 task ? task->itt : 0);
2248 mutex_unlock(&session->eh_mutex);
2249 return FAILED;
2250 }
2251 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2252
2253 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2254 {
2255 memset(hdr, 0, sizeof(*hdr));
2256 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2257 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2258 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2259 int_to_scsilun(sc->device->lun, &hdr->lun);
2260 hdr->rtt = RESERVED_ITT;
2261 }
2262
2263 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2264 {
2265 struct iscsi_cls_session *cls_session;
2266 struct iscsi_session *session;
2267 struct iscsi_conn *conn;
2268 struct iscsi_tm *hdr;
2269 int rc = FAILED;
2270
2271 cls_session = starget_to_session(scsi_target(sc->device));
2272 session = cls_session->dd_data;
2273
2274 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2275 sc->device->lun);
2276
2277 mutex_lock(&session->eh_mutex);
2278 spin_lock_bh(&session->frwd_lock);
2279 /*
2280 * Just check if we are not logged in. We cannot check for
2281 * the phase because the reset could come from a ioctl.
2282 */
2283 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2284 goto unlock;
2285 conn = session->leadconn;
2286
2287 /* only have one tmf outstanding at a time */
2288 if (conn->tmf_state != TMF_INITIAL)
2289 goto unlock;
2290 conn->tmf_state = TMF_QUEUED;
2291
2292 hdr = &conn->tmhdr;
2293 iscsi_prep_lun_reset_pdu(sc, hdr);
2294
2295 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2296 session->lu_reset_timeout)) {
2297 rc = FAILED;
2298 goto unlock;
2299 }
2300
2301 switch (conn->tmf_state) {
2302 case TMF_SUCCESS:
2303 break;
2304 case TMF_TIMEDOUT:
2305 spin_unlock_bh(&session->frwd_lock);
2306 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2307 goto done;
2308 default:
2309 conn->tmf_state = TMF_INITIAL;
2310 goto unlock;
2311 }
2312
2313 rc = SUCCESS;
2314 spin_unlock_bh(&session->frwd_lock);
2315
2316 iscsi_suspend_tx(conn);
2317
2318 spin_lock_bh(&session->frwd_lock);
2319 memset(hdr, 0, sizeof(*hdr));
2320 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2321 conn->tmf_state = TMF_INITIAL;
2322 spin_unlock_bh(&session->frwd_lock);
2323
2324 iscsi_start_tx(conn);
2325 goto done;
2326
2327 unlock:
2328 spin_unlock_bh(&session->frwd_lock);
2329 done:
2330 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2331 rc == SUCCESS ? "SUCCESS" : "FAILED");
2332 mutex_unlock(&session->eh_mutex);
2333 return rc;
2334 }
2335 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2336
2337 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2338 {
2339 struct iscsi_session *session = cls_session->dd_data;
2340
2341 spin_lock_bh(&session->frwd_lock);
2342 if (session->state != ISCSI_STATE_LOGGED_IN) {
2343 session->state = ISCSI_STATE_RECOVERY_FAILED;
2344 if (session->leadconn)
2345 wake_up(&session->leadconn->ehwait);
2346 }
2347 spin_unlock_bh(&session->frwd_lock);
2348 }
2349 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2350
2351 /**
2352 * iscsi_eh_session_reset - drop session and attempt relogin
2353 * @sc: scsi command
2354 *
2355 * This function will wait for a relogin, session termination from
2356 * userspace, or a recovery/replacement timeout.
2357 */
2358 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2359 {
2360 struct iscsi_cls_session *cls_session;
2361 struct iscsi_session *session;
2362 struct iscsi_conn *conn;
2363
2364 cls_session = starget_to_session(scsi_target(sc->device));
2365 session = cls_session->dd_data;
2366 conn = session->leadconn;
2367
2368 mutex_lock(&session->eh_mutex);
2369 spin_lock_bh(&session->frwd_lock);
2370 if (session->state == ISCSI_STATE_TERMINATE) {
2371 failed:
2372 ISCSI_DBG_EH(session,
2373 "failing session reset: Could not log back into "
2374 "%s, %s [age %d]\n", session->targetname,
2375 conn->persistent_address, session->age);
2376 spin_unlock_bh(&session->frwd_lock);
2377 mutex_unlock(&session->eh_mutex);
2378 return FAILED;
2379 }
2380
2381 spin_unlock_bh(&session->frwd_lock);
2382 mutex_unlock(&session->eh_mutex);
2383 /*
2384 * we drop the lock here but the leadconn cannot be destoyed while
2385 * we are in the scsi eh
2386 */
2387 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2388
2389 ISCSI_DBG_EH(session, "wait for relogin\n");
2390 wait_event_interruptible(conn->ehwait,
2391 session->state == ISCSI_STATE_TERMINATE ||
2392 session->state == ISCSI_STATE_LOGGED_IN ||
2393 session->state == ISCSI_STATE_RECOVERY_FAILED);
2394 if (signal_pending(current))
2395 flush_signals(current);
2396
2397 mutex_lock(&session->eh_mutex);
2398 spin_lock_bh(&session->frwd_lock);
2399 if (session->state == ISCSI_STATE_LOGGED_IN) {
2400 ISCSI_DBG_EH(session,
2401 "session reset succeeded for %s,%s\n",
2402 session->targetname, conn->persistent_address);
2403 } else
2404 goto failed;
2405 spin_unlock_bh(&session->frwd_lock);
2406 mutex_unlock(&session->eh_mutex);
2407 return SUCCESS;
2408 }
2409 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2410
2411 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2412 {
2413 memset(hdr, 0, sizeof(*hdr));
2414 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2415 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2416 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2417 hdr->rtt = RESERVED_ITT;
2418 }
2419
2420 /**
2421 * iscsi_eh_target_reset - reset target
2422 * @sc: scsi command
2423 *
2424 * This will attempt to send a warm target reset.
2425 */
2426 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2427 {
2428 struct iscsi_cls_session *cls_session;
2429 struct iscsi_session *session;
2430 struct iscsi_conn *conn;
2431 struct iscsi_tm *hdr;
2432 int rc = FAILED;
2433
2434 cls_session = starget_to_session(scsi_target(sc->device));
2435 session = cls_session->dd_data;
2436
2437 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2438 session->targetname);
2439
2440 mutex_lock(&session->eh_mutex);
2441 spin_lock_bh(&session->frwd_lock);
2442 /*
2443 * Just check if we are not logged in. We cannot check for
2444 * the phase because the reset could come from a ioctl.
2445 */
2446 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2447 goto unlock;
2448 conn = session->leadconn;
2449
2450 /* only have one tmf outstanding at a time */
2451 if (conn->tmf_state != TMF_INITIAL)
2452 goto unlock;
2453 conn->tmf_state = TMF_QUEUED;
2454
2455 hdr = &conn->tmhdr;
2456 iscsi_prep_tgt_reset_pdu(sc, hdr);
2457
2458 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2459 session->tgt_reset_timeout)) {
2460 rc = FAILED;
2461 goto unlock;
2462 }
2463
2464 switch (conn->tmf_state) {
2465 case TMF_SUCCESS:
2466 break;
2467 case TMF_TIMEDOUT:
2468 spin_unlock_bh(&session->frwd_lock);
2469 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2470 goto done;
2471 default:
2472 conn->tmf_state = TMF_INITIAL;
2473 goto unlock;
2474 }
2475
2476 rc = SUCCESS;
2477 spin_unlock_bh(&session->frwd_lock);
2478
2479 iscsi_suspend_tx(conn);
2480
2481 spin_lock_bh(&session->frwd_lock);
2482 memset(hdr, 0, sizeof(*hdr));
2483 fail_scsi_tasks(conn, -1, DID_ERROR);
2484 conn->tmf_state = TMF_INITIAL;
2485 spin_unlock_bh(&session->frwd_lock);
2486
2487 iscsi_start_tx(conn);
2488 goto done;
2489
2490 unlock:
2491 spin_unlock_bh(&session->frwd_lock);
2492 done:
2493 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2494 rc == SUCCESS ? "SUCCESS" : "FAILED");
2495 mutex_unlock(&session->eh_mutex);
2496 return rc;
2497 }
2498 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2499
2500 /**
2501 * iscsi_eh_recover_target - reset target and possibly the session
2502 * @sc: scsi command
2503 *
2504 * This will attempt to send a warm target reset. If that fails,
2505 * we will escalate to ERL0 session recovery.
2506 */
2507 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2508 {
2509 int rc;
2510
2511 rc = iscsi_eh_target_reset(sc);
2512 if (rc == FAILED)
2513 rc = iscsi_eh_session_reset(sc);
2514 return rc;
2515 }
2516 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2517
2518 /*
2519 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2520 * should be accessed via kfifo_{get,put} on q->queue.
2521 * Optionally, the caller can obtain the array of object pointers
2522 * by passing in a non-NULL @items pointer
2523 */
2524 int
2525 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2526 {
2527 int i, num_arrays = 1;
2528
2529 memset(q, 0, sizeof(*q));
2530
2531 q->max = max;
2532
2533 /* If the user passed an items pointer, he wants a copy of
2534 * the array. */
2535 if (items)
2536 num_arrays++;
2537 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2538 if (q->pool == NULL)
2539 return -ENOMEM;
2540
2541 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2542
2543 for (i = 0; i < max; i++) {
2544 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2545 if (q->pool[i] == NULL) {
2546 q->max = i;
2547 goto enomem;
2548 }
2549 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2550 }
2551
2552 if (items) {
2553 *items = q->pool + max;
2554 memcpy(*items, q->pool, max * sizeof(void *));
2555 }
2556
2557 return 0;
2558
2559 enomem:
2560 iscsi_pool_free(q);
2561 return -ENOMEM;
2562 }
2563 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2564
2565 void iscsi_pool_free(struct iscsi_pool *q)
2566 {
2567 int i;
2568
2569 for (i = 0; i < q->max; i++)
2570 kfree(q->pool[i]);
2571 kfree(q->pool);
2572 }
2573 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2574
2575 /**
2576 * iscsi_host_add - add host to system
2577 * @shost: scsi host
2578 * @pdev: parent device
2579 *
2580 * This should be called by partial offload and software iscsi drivers
2581 * to add a host to the system.
2582 */
2583 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2584 {
2585 if (!shost->can_queue)
2586 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2587
2588 if (!shost->cmd_per_lun)
2589 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2590
2591 if (!shost->transportt->eh_timed_out)
2592 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2593 return scsi_add_host(shost, pdev);
2594 }
2595 EXPORT_SYMBOL_GPL(iscsi_host_add);
2596
2597 /**
2598 * iscsi_host_alloc - allocate a host and driver data
2599 * @sht: scsi host template
2600 * @dd_data_size: driver host data size
2601 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2602 *
2603 * This should be called by partial offload and software iscsi drivers.
2604 * To access the driver specific memory use the iscsi_host_priv() macro.
2605 */
2606 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2607 int dd_data_size, bool xmit_can_sleep)
2608 {
2609 struct Scsi_Host *shost;
2610 struct iscsi_host *ihost;
2611
2612 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2613 if (!shost)
2614 return NULL;
2615 ihost = shost_priv(shost);
2616
2617 if (xmit_can_sleep) {
2618 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2619 "iscsi_q_%d", shost->host_no);
2620 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2621 if (!ihost->workq)
2622 goto free_host;
2623 }
2624
2625 spin_lock_init(&ihost->lock);
2626 ihost->state = ISCSI_HOST_SETUP;
2627 ihost->num_sessions = 0;
2628 init_waitqueue_head(&ihost->session_removal_wq);
2629 return shost;
2630
2631 free_host:
2632 scsi_host_put(shost);
2633 return NULL;
2634 }
2635 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2636
2637 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2638 {
2639 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2640 }
2641
2642 /**
2643 * iscsi_host_remove - remove host and sessions
2644 * @shost: scsi host
2645 *
2646 * If there are any sessions left, this will initiate the removal and wait
2647 * for the completion.
2648 */
2649 void iscsi_host_remove(struct Scsi_Host *shost)
2650 {
2651 struct iscsi_host *ihost = shost_priv(shost);
2652 unsigned long flags;
2653
2654 spin_lock_irqsave(&ihost->lock, flags);
2655 ihost->state = ISCSI_HOST_REMOVED;
2656 spin_unlock_irqrestore(&ihost->lock, flags);
2657
2658 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2659 wait_event_interruptible(ihost->session_removal_wq,
2660 ihost->num_sessions == 0);
2661 if (signal_pending(current))
2662 flush_signals(current);
2663
2664 scsi_remove_host(shost);
2665 if (ihost->workq)
2666 destroy_workqueue(ihost->workq);
2667 }
2668 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2669
2670 void iscsi_host_free(struct Scsi_Host *shost)
2671 {
2672 struct iscsi_host *ihost = shost_priv(shost);
2673
2674 kfree(ihost->netdev);
2675 kfree(ihost->hwaddress);
2676 kfree(ihost->initiatorname);
2677 scsi_host_put(shost);
2678 }
2679 EXPORT_SYMBOL_GPL(iscsi_host_free);
2680
2681 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2682 {
2683 struct iscsi_host *ihost = shost_priv(shost);
2684 unsigned long flags;
2685
2686 shost = scsi_host_get(shost);
2687 if (!shost) {
2688 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2689 "of session teardown event because host already "
2690 "removed.\n");
2691 return;
2692 }
2693
2694 spin_lock_irqsave(&ihost->lock, flags);
2695 ihost->num_sessions--;
2696 if (ihost->num_sessions == 0)
2697 wake_up(&ihost->session_removal_wq);
2698 spin_unlock_irqrestore(&ihost->lock, flags);
2699 scsi_host_put(shost);
2700 }
2701
2702 /**
2703 * iscsi_session_setup - create iscsi cls session and host and session
2704 * @iscsit: iscsi transport template
2705 * @shost: scsi host
2706 * @cmds_max: session can queue
2707 * @cmd_task_size: LLD task private data size
2708 * @initial_cmdsn: initial CmdSN
2709 *
2710 * This can be used by software iscsi_transports that allocate
2711 * a session per scsi host.
2712 *
2713 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2714 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2715 * for nop handling and login/logout requests.
2716 */
2717 struct iscsi_cls_session *
2718 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2719 uint16_t cmds_max, int dd_size, int cmd_task_size,
2720 uint32_t initial_cmdsn, unsigned int id)
2721 {
2722 struct iscsi_host *ihost = shost_priv(shost);
2723 struct iscsi_session *session;
2724 struct iscsi_cls_session *cls_session;
2725 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2726 unsigned long flags;
2727
2728 spin_lock_irqsave(&ihost->lock, flags);
2729 if (ihost->state == ISCSI_HOST_REMOVED) {
2730 spin_unlock_irqrestore(&ihost->lock, flags);
2731 return NULL;
2732 }
2733 ihost->num_sessions++;
2734 spin_unlock_irqrestore(&ihost->lock, flags);
2735
2736 if (!total_cmds)
2737 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2738 /*
2739 * The iscsi layer needs some tasks for nop handling and tmfs,
2740 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2741 * + 1 command for scsi IO.
2742 */
2743 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2744 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2745 "must be a power of two that is at least %d.\n",
2746 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2747 goto dec_session_count;
2748 }
2749
2750 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2751 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2752 "must be a power of 2 less than or equal to %d.\n",
2753 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2754 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2755 }
2756
2757 if (!is_power_of_2(total_cmds)) {
2758 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2759 "must be a power of 2.\n", total_cmds);
2760 total_cmds = rounddown_pow_of_two(total_cmds);
2761 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2762 return NULL;
2763 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2764 total_cmds);
2765 }
2766 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2767
2768 cls_session = iscsi_alloc_session(shost, iscsit,
2769 sizeof(struct iscsi_session) +
2770 dd_size);
2771 if (!cls_session)
2772 goto dec_session_count;
2773 session = cls_session->dd_data;
2774 session->cls_session = cls_session;
2775 session->host = shost;
2776 session->state = ISCSI_STATE_FREE;
2777 session->fast_abort = 1;
2778 session->tgt_reset_timeout = 30;
2779 session->lu_reset_timeout = 15;
2780 session->abort_timeout = 10;
2781 session->scsi_cmds_max = scsi_cmds;
2782 session->cmds_max = total_cmds;
2783 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2784 session->exp_cmdsn = initial_cmdsn + 1;
2785 session->max_cmdsn = initial_cmdsn + 1;
2786 session->max_r2t = 1;
2787 session->tt = iscsit;
2788 session->dd_data = cls_session->dd_data + sizeof(*session);
2789
2790 mutex_init(&session->eh_mutex);
2791 spin_lock_init(&session->frwd_lock);
2792 spin_lock_init(&session->back_lock);
2793
2794 /* initialize SCSI PDU commands pool */
2795 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2796 (void***)&session->cmds,
2797 cmd_task_size + sizeof(struct iscsi_task)))
2798 goto cmdpool_alloc_fail;
2799
2800 /* pre-format cmds pool with ITT */
2801 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2802 struct iscsi_task *task = session->cmds[cmd_i];
2803
2804 if (cmd_task_size)
2805 task->dd_data = &task[1];
2806 task->itt = cmd_i;
2807 task->state = ISCSI_TASK_FREE;
2808 INIT_LIST_HEAD(&task->running);
2809 }
2810
2811 if (!try_module_get(iscsit->owner))
2812 goto module_get_fail;
2813
2814 if (iscsi_add_session(cls_session, id))
2815 goto cls_session_fail;
2816
2817 return cls_session;
2818
2819 cls_session_fail:
2820 module_put(iscsit->owner);
2821 module_get_fail:
2822 iscsi_pool_free(&session->cmdpool);
2823 cmdpool_alloc_fail:
2824 iscsi_free_session(cls_session);
2825 dec_session_count:
2826 iscsi_host_dec_session_cnt(shost);
2827 return NULL;
2828 }
2829 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2830
2831 /**
2832 * iscsi_session_teardown - destroy session, host, and cls_session
2833 * @cls_session: iscsi session
2834 *
2835 * The driver must have called iscsi_remove_session before
2836 * calling this.
2837 */
2838 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2839 {
2840 struct iscsi_session *session = cls_session->dd_data;
2841 struct module *owner = cls_session->transport->owner;
2842 struct Scsi_Host *shost = session->host;
2843
2844 iscsi_pool_free(&session->cmdpool);
2845
2846 kfree(session->password);
2847 kfree(session->password_in);
2848 kfree(session->username);
2849 kfree(session->username_in);
2850 kfree(session->targetname);
2851 kfree(session->targetalias);
2852 kfree(session->initiatorname);
2853 kfree(session->boot_root);
2854 kfree(session->boot_nic);
2855 kfree(session->boot_target);
2856 kfree(session->ifacename);
2857 kfree(session->portal_type);
2858 kfree(session->discovery_parent_type);
2859
2860 iscsi_destroy_session(cls_session);
2861 iscsi_host_dec_session_cnt(shost);
2862 module_put(owner);
2863 }
2864 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2865
2866 /**
2867 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2868 * @cls_session: iscsi_cls_session
2869 * @dd_size: private driver data size
2870 * @conn_idx: cid
2871 */
2872 struct iscsi_cls_conn *
2873 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2874 uint32_t conn_idx)
2875 {
2876 struct iscsi_session *session = cls_session->dd_data;
2877 struct iscsi_conn *conn;
2878 struct iscsi_cls_conn *cls_conn;
2879 char *data;
2880
2881 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2882 conn_idx);
2883 if (!cls_conn)
2884 return NULL;
2885 conn = cls_conn->dd_data;
2886 memset(conn, 0, sizeof(*conn) + dd_size);
2887
2888 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2889 conn->session = session;
2890 conn->cls_conn = cls_conn;
2891 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2892 conn->id = conn_idx;
2893 conn->exp_statsn = 0;
2894 conn->tmf_state = TMF_INITIAL;
2895
2896 init_timer(&conn->transport_timer);
2897 conn->transport_timer.data = (unsigned long)conn;
2898 conn->transport_timer.function = iscsi_check_transport_timeouts;
2899
2900 INIT_LIST_HEAD(&conn->mgmtqueue);
2901 INIT_LIST_HEAD(&conn->cmdqueue);
2902 INIT_LIST_HEAD(&conn->requeue);
2903 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2904
2905 /* allocate login_task used for the login/text sequences */
2906 spin_lock_bh(&session->frwd_lock);
2907 if (!kfifo_out(&session->cmdpool.queue,
2908 (void*)&conn->login_task,
2909 sizeof(void*))) {
2910 spin_unlock_bh(&session->frwd_lock);
2911 goto login_task_alloc_fail;
2912 }
2913 spin_unlock_bh(&session->frwd_lock);
2914
2915 data = (char *) __get_free_pages(GFP_KERNEL,
2916 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2917 if (!data)
2918 goto login_task_data_alloc_fail;
2919 conn->login_task->data = conn->data = data;
2920
2921 init_timer(&conn->tmf_timer);
2922 init_waitqueue_head(&conn->ehwait);
2923
2924 return cls_conn;
2925
2926 login_task_data_alloc_fail:
2927 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2928 sizeof(void*));
2929 login_task_alloc_fail:
2930 iscsi_destroy_conn(cls_conn);
2931 return NULL;
2932 }
2933 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2934
2935 /**
2936 * iscsi_conn_teardown - teardown iscsi connection
2937 * cls_conn: iscsi class connection
2938 *
2939 * TODO: we may need to make this into a two step process
2940 * like scsi-mls remove + put host
2941 */
2942 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2943 {
2944 struct iscsi_conn *conn = cls_conn->dd_data;
2945 struct iscsi_session *session = conn->session;
2946
2947 del_timer_sync(&conn->transport_timer);
2948
2949 mutex_lock(&session->eh_mutex);
2950 spin_lock_bh(&session->frwd_lock);
2951 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2952 if (session->leadconn == conn) {
2953 /*
2954 * leading connection? then give up on recovery.
2955 */
2956 session->state = ISCSI_STATE_TERMINATE;
2957 wake_up(&conn->ehwait);
2958 }
2959 spin_unlock_bh(&session->frwd_lock);
2960
2961 /* flush queued up work because we free the connection below */
2962 iscsi_suspend_tx(conn);
2963
2964 spin_lock_bh(&session->frwd_lock);
2965 free_pages((unsigned long) conn->data,
2966 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2967 kfree(conn->persistent_address);
2968 kfree(conn->local_ipaddr);
2969 /* regular RX path uses back_lock */
2970 spin_lock_bh(&session->back_lock);
2971 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2972 sizeof(void*));
2973 spin_unlock_bh(&session->back_lock);
2974 if (session->leadconn == conn)
2975 session->leadconn = NULL;
2976 spin_unlock_bh(&session->frwd_lock);
2977 mutex_unlock(&session->eh_mutex);
2978
2979 iscsi_destroy_conn(cls_conn);
2980 }
2981 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2982
2983 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2984 {
2985 struct iscsi_conn *conn = cls_conn->dd_data;
2986 struct iscsi_session *session = conn->session;
2987
2988 if (!session) {
2989 iscsi_conn_printk(KERN_ERR, conn,
2990 "can't start unbound connection\n");
2991 return -EPERM;
2992 }
2993
2994 if ((session->imm_data_en || !session->initial_r2t_en) &&
2995 session->first_burst > session->max_burst) {
2996 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2997 "first_burst %d max_burst %d\n",
2998 session->first_burst, session->max_burst);
2999 return -EINVAL;
3000 }
3001
3002 if (conn->ping_timeout && !conn->recv_timeout) {
3003 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3004 "zero. Using 5 seconds\n.");
3005 conn->recv_timeout = 5;
3006 }
3007
3008 if (conn->recv_timeout && !conn->ping_timeout) {
3009 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3010 "zero. Using 5 seconds.\n");
3011 conn->ping_timeout = 5;
3012 }
3013
3014 spin_lock_bh(&session->frwd_lock);
3015 conn->c_stage = ISCSI_CONN_STARTED;
3016 session->state = ISCSI_STATE_LOGGED_IN;
3017 session->queued_cmdsn = session->cmdsn;
3018
3019 conn->last_recv = jiffies;
3020 conn->last_ping = jiffies;
3021 if (conn->recv_timeout && conn->ping_timeout)
3022 mod_timer(&conn->transport_timer,
3023 jiffies + (conn->recv_timeout * HZ));
3024
3025 switch(conn->stop_stage) {
3026 case STOP_CONN_RECOVER:
3027 /*
3028 * unblock eh_abort() if it is blocked. re-try all
3029 * commands after successful recovery
3030 */
3031 conn->stop_stage = 0;
3032 conn->tmf_state = TMF_INITIAL;
3033 session->age++;
3034 if (session->age == 16)
3035 session->age = 0;
3036 break;
3037 case STOP_CONN_TERM:
3038 conn->stop_stage = 0;
3039 break;
3040 default:
3041 break;
3042 }
3043 spin_unlock_bh(&session->frwd_lock);
3044
3045 iscsi_unblock_session(session->cls_session);
3046 wake_up(&conn->ehwait);
3047 return 0;
3048 }
3049 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3050
3051 static void
3052 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3053 {
3054 struct iscsi_task *task;
3055 int i, state;
3056
3057 for (i = 0; i < conn->session->cmds_max; i++) {
3058 task = conn->session->cmds[i];
3059 if (task->sc)
3060 continue;
3061
3062 if (task->state == ISCSI_TASK_FREE)
3063 continue;
3064
3065 ISCSI_DBG_SESSION(conn->session,
3066 "failing mgmt itt 0x%x state %d\n",
3067 task->itt, task->state);
3068 state = ISCSI_TASK_ABRT_SESS_RECOV;
3069 if (task->state == ISCSI_TASK_PENDING)
3070 state = ISCSI_TASK_COMPLETED;
3071 iscsi_complete_task(task, state);
3072
3073 }
3074 }
3075
3076 static void iscsi_start_session_recovery(struct iscsi_session *session,
3077 struct iscsi_conn *conn, int flag)
3078 {
3079 int old_stop_stage;
3080
3081 mutex_lock(&session->eh_mutex);
3082 spin_lock_bh(&session->frwd_lock);
3083 if (conn->stop_stage == STOP_CONN_TERM) {
3084 spin_unlock_bh(&session->frwd_lock);
3085 mutex_unlock(&session->eh_mutex);
3086 return;
3087 }
3088
3089 /*
3090 * When this is called for the in_login state, we only want to clean
3091 * up the login task and connection. We do not need to block and set
3092 * the recovery state again
3093 */
3094 if (flag == STOP_CONN_TERM)
3095 session->state = ISCSI_STATE_TERMINATE;
3096 else if (conn->stop_stage != STOP_CONN_RECOVER)
3097 session->state = ISCSI_STATE_IN_RECOVERY;
3098
3099 old_stop_stage = conn->stop_stage;
3100 conn->stop_stage = flag;
3101 spin_unlock_bh(&session->frwd_lock);
3102
3103 del_timer_sync(&conn->transport_timer);
3104 iscsi_suspend_tx(conn);
3105
3106 spin_lock_bh(&session->frwd_lock);
3107 conn->c_stage = ISCSI_CONN_STOPPED;
3108 spin_unlock_bh(&session->frwd_lock);
3109
3110 /*
3111 * for connection level recovery we should not calculate
3112 * header digest. conn->hdr_size used for optimization
3113 * in hdr_extract() and will be re-negotiated at
3114 * set_param() time.
3115 */
3116 if (flag == STOP_CONN_RECOVER) {
3117 conn->hdrdgst_en = 0;
3118 conn->datadgst_en = 0;
3119 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3120 old_stop_stage != STOP_CONN_RECOVER) {
3121 ISCSI_DBG_SESSION(session, "blocking session\n");
3122 iscsi_block_session(session->cls_session);
3123 }
3124 }
3125
3126 /*
3127 * flush queues.
3128 */
3129 spin_lock_bh(&session->frwd_lock);
3130 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3131 fail_mgmt_tasks(session, conn);
3132 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3133 spin_unlock_bh(&session->frwd_lock);
3134 mutex_unlock(&session->eh_mutex);
3135 }
3136
3137 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3138 {
3139 struct iscsi_conn *conn = cls_conn->dd_data;
3140 struct iscsi_session *session = conn->session;
3141
3142 switch (flag) {
3143 case STOP_CONN_RECOVER:
3144 case STOP_CONN_TERM:
3145 iscsi_start_session_recovery(session, conn, flag);
3146 break;
3147 default:
3148 iscsi_conn_printk(KERN_ERR, conn,
3149 "invalid stop flag %d\n", flag);
3150 }
3151 }
3152 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3153
3154 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3155 struct iscsi_cls_conn *cls_conn, int is_leading)
3156 {
3157 struct iscsi_session *session = cls_session->dd_data;
3158 struct iscsi_conn *conn = cls_conn->dd_data;
3159
3160 spin_lock_bh(&session->frwd_lock);
3161 if (is_leading)
3162 session->leadconn = conn;
3163 spin_unlock_bh(&session->frwd_lock);
3164
3165 /*
3166 * Unblock xmitworker(), Login Phase will pass through.
3167 */
3168 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3169 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3170 return 0;
3171 }
3172 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3173
3174 int iscsi_switch_str_param(char **param, char *new_val_buf)
3175 {
3176 char *new_val;
3177
3178 if (*param) {
3179 if (!strcmp(*param, new_val_buf))
3180 return 0;
3181 }
3182
3183 new_val = kstrdup(new_val_buf, GFP_NOIO);
3184 if (!new_val)
3185 return -ENOMEM;
3186
3187 kfree(*param);
3188 *param = new_val;
3189 return 0;
3190 }
3191 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3192
3193 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3194 enum iscsi_param param, char *buf, int buflen)
3195 {
3196 struct iscsi_conn *conn = cls_conn->dd_data;
3197 struct iscsi_session *session = conn->session;
3198 int val;
3199
3200 switch(param) {
3201 case ISCSI_PARAM_FAST_ABORT:
3202 sscanf(buf, "%d", &session->fast_abort);
3203 break;
3204 case ISCSI_PARAM_ABORT_TMO:
3205 sscanf(buf, "%d", &session->abort_timeout);
3206 break;
3207 case ISCSI_PARAM_LU_RESET_TMO:
3208 sscanf(buf, "%d", &session->lu_reset_timeout);
3209 break;
3210 case ISCSI_PARAM_TGT_RESET_TMO:
3211 sscanf(buf, "%d", &session->tgt_reset_timeout);
3212 break;
3213 case ISCSI_PARAM_PING_TMO:
3214 sscanf(buf, "%d", &conn->ping_timeout);
3215 break;
3216 case ISCSI_PARAM_RECV_TMO:
3217 sscanf(buf, "%d", &conn->recv_timeout);
3218 break;
3219 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3220 sscanf(buf, "%d", &conn->max_recv_dlength);
3221 break;
3222 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3223 sscanf(buf, "%d", &conn->max_xmit_dlength);
3224 break;
3225 case ISCSI_PARAM_HDRDGST_EN:
3226 sscanf(buf, "%d", &conn->hdrdgst_en);
3227 break;
3228 case ISCSI_PARAM_DATADGST_EN:
3229 sscanf(buf, "%d", &conn->datadgst_en);
3230 break;
3231 case ISCSI_PARAM_INITIAL_R2T_EN:
3232 sscanf(buf, "%d", &session->initial_r2t_en);
3233 break;
3234 case ISCSI_PARAM_MAX_R2T:
3235 sscanf(buf, "%hu", &session->max_r2t);
3236 break;
3237 case ISCSI_PARAM_IMM_DATA_EN:
3238 sscanf(buf, "%d", &session->imm_data_en);
3239 break;
3240 case ISCSI_PARAM_FIRST_BURST:
3241 sscanf(buf, "%d", &session->first_burst);
3242 break;
3243 case ISCSI_PARAM_MAX_BURST:
3244 sscanf(buf, "%d", &session->max_burst);
3245 break;
3246 case ISCSI_PARAM_PDU_INORDER_EN:
3247 sscanf(buf, "%d", &session->pdu_inorder_en);
3248 break;
3249 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3250 sscanf(buf, "%d", &session->dataseq_inorder_en);
3251 break;
3252 case ISCSI_PARAM_ERL:
3253 sscanf(buf, "%d", &session->erl);
3254 break;
3255 case ISCSI_PARAM_EXP_STATSN:
3256 sscanf(buf, "%u", &conn->exp_statsn);
3257 break;
3258 case ISCSI_PARAM_USERNAME:
3259 return iscsi_switch_str_param(&session->username, buf);
3260 case ISCSI_PARAM_USERNAME_IN:
3261 return iscsi_switch_str_param(&session->username_in, buf);
3262 case ISCSI_PARAM_PASSWORD:
3263 return iscsi_switch_str_param(&session->password, buf);
3264 case ISCSI_PARAM_PASSWORD_IN:
3265 return iscsi_switch_str_param(&session->password_in, buf);
3266 case ISCSI_PARAM_TARGET_NAME:
3267 return iscsi_switch_str_param(&session->targetname, buf);
3268 case ISCSI_PARAM_TARGET_ALIAS:
3269 return iscsi_switch_str_param(&session->targetalias, buf);
3270 case ISCSI_PARAM_TPGT:
3271 sscanf(buf, "%d", &session->tpgt);
3272 break;
3273 case ISCSI_PARAM_PERSISTENT_PORT:
3274 sscanf(buf, "%d", &conn->persistent_port);
3275 break;
3276 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3277 return iscsi_switch_str_param(&conn->persistent_address, buf);
3278 case ISCSI_PARAM_IFACE_NAME:
3279 return iscsi_switch_str_param(&session->ifacename, buf);
3280 case ISCSI_PARAM_INITIATOR_NAME:
3281 return iscsi_switch_str_param(&session->initiatorname, buf);
3282 case ISCSI_PARAM_BOOT_ROOT:
3283 return iscsi_switch_str_param(&session->boot_root, buf);
3284 case ISCSI_PARAM_BOOT_NIC:
3285 return iscsi_switch_str_param(&session->boot_nic, buf);
3286 case ISCSI_PARAM_BOOT_TARGET:
3287 return iscsi_switch_str_param(&session->boot_target, buf);
3288 case ISCSI_PARAM_PORTAL_TYPE:
3289 return iscsi_switch_str_param(&session->portal_type, buf);
3290 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3291 return iscsi_switch_str_param(&session->discovery_parent_type,
3292 buf);
3293 case ISCSI_PARAM_DISCOVERY_SESS:
3294 sscanf(buf, "%d", &val);
3295 session->discovery_sess = !!val;
3296 break;
3297 case ISCSI_PARAM_LOCAL_IPADDR:
3298 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3299 default:
3300 return -ENOSYS;
3301 }
3302
3303 return 0;
3304 }
3305 EXPORT_SYMBOL_GPL(iscsi_set_param);
3306
3307 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3308 enum iscsi_param param, char *buf)
3309 {
3310 struct iscsi_session *session = cls_session->dd_data;
3311 int len;
3312
3313 switch(param) {
3314 case ISCSI_PARAM_FAST_ABORT:
3315 len = sprintf(buf, "%d\n", session->fast_abort);
3316 break;
3317 case ISCSI_PARAM_ABORT_TMO:
3318 len = sprintf(buf, "%d\n", session->abort_timeout);
3319 break;
3320 case ISCSI_PARAM_LU_RESET_TMO:
3321 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3322 break;
3323 case ISCSI_PARAM_TGT_RESET_TMO:
3324 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3325 break;
3326 case ISCSI_PARAM_INITIAL_R2T_EN:
3327 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3328 break;
3329 case ISCSI_PARAM_MAX_R2T:
3330 len = sprintf(buf, "%hu\n", session->max_r2t);
3331 break;
3332 case ISCSI_PARAM_IMM_DATA_EN:
3333 len = sprintf(buf, "%d\n", session->imm_data_en);
3334 break;
3335 case ISCSI_PARAM_FIRST_BURST:
3336 len = sprintf(buf, "%u\n", session->first_burst);
3337 break;
3338 case ISCSI_PARAM_MAX_BURST:
3339 len = sprintf(buf, "%u\n", session->max_burst);
3340 break;
3341 case ISCSI_PARAM_PDU_INORDER_EN:
3342 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3343 break;
3344 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3345 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3346 break;
3347 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3348 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3349 break;
3350 case ISCSI_PARAM_ERL:
3351 len = sprintf(buf, "%d\n", session->erl);
3352 break;
3353 case ISCSI_PARAM_TARGET_NAME:
3354 len = sprintf(buf, "%s\n", session->targetname);
3355 break;
3356 case ISCSI_PARAM_TARGET_ALIAS:
3357 len = sprintf(buf, "%s\n", session->targetalias);
3358 break;
3359 case ISCSI_PARAM_TPGT:
3360 len = sprintf(buf, "%d\n", session->tpgt);
3361 break;
3362 case ISCSI_PARAM_USERNAME:
3363 len = sprintf(buf, "%s\n", session->username);
3364 break;
3365 case ISCSI_PARAM_USERNAME_IN:
3366 len = sprintf(buf, "%s\n", session->username_in);
3367 break;
3368 case ISCSI_PARAM_PASSWORD:
3369 len = sprintf(buf, "%s\n", session->password);
3370 break;
3371 case ISCSI_PARAM_PASSWORD_IN:
3372 len = sprintf(buf, "%s\n", session->password_in);
3373 break;
3374 case ISCSI_PARAM_IFACE_NAME:
3375 len = sprintf(buf, "%s\n", session->ifacename);
3376 break;
3377 case ISCSI_PARAM_INITIATOR_NAME:
3378 len = sprintf(buf, "%s\n", session->initiatorname);
3379 break;
3380 case ISCSI_PARAM_BOOT_ROOT:
3381 len = sprintf(buf, "%s\n", session->boot_root);
3382 break;
3383 case ISCSI_PARAM_BOOT_NIC:
3384 len = sprintf(buf, "%s\n", session->boot_nic);
3385 break;
3386 case ISCSI_PARAM_BOOT_TARGET:
3387 len = sprintf(buf, "%s\n", session->boot_target);
3388 break;
3389 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3390 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3391 break;
3392 case ISCSI_PARAM_DISCOVERY_SESS:
3393 len = sprintf(buf, "%u\n", session->discovery_sess);
3394 break;
3395 case ISCSI_PARAM_PORTAL_TYPE:
3396 len = sprintf(buf, "%s\n", session->portal_type);
3397 break;
3398 case ISCSI_PARAM_CHAP_AUTH_EN:
3399 len = sprintf(buf, "%u\n", session->chap_auth_en);
3400 break;
3401 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3402 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3403 break;
3404 case ISCSI_PARAM_BIDI_CHAP_EN:
3405 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3406 break;
3407 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3408 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3409 break;
3410 case ISCSI_PARAM_DEF_TIME2WAIT:
3411 len = sprintf(buf, "%d\n", session->time2wait);
3412 break;
3413 case ISCSI_PARAM_DEF_TIME2RETAIN:
3414 len = sprintf(buf, "%d\n", session->time2retain);
3415 break;
3416 case ISCSI_PARAM_TSID:
3417 len = sprintf(buf, "%u\n", session->tsid);
3418 break;
3419 case ISCSI_PARAM_ISID:
3420 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3421 session->isid[0], session->isid[1],
3422 session->isid[2], session->isid[3],
3423 session->isid[4], session->isid[5]);
3424 break;
3425 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3426 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3427 break;
3428 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3429 if (session->discovery_parent_type)
3430 len = sprintf(buf, "%s\n",
3431 session->discovery_parent_type);
3432 else
3433 len = sprintf(buf, "\n");
3434 break;
3435 default:
3436 return -ENOSYS;
3437 }
3438
3439 return len;
3440 }
3441 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3442
3443 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3444 enum iscsi_param param, char *buf)
3445 {
3446 struct sockaddr_in6 *sin6 = NULL;
3447 struct sockaddr_in *sin = NULL;
3448 int len;
3449
3450 switch (addr->ss_family) {
3451 case AF_INET:
3452 sin = (struct sockaddr_in *)addr;
3453 break;
3454 case AF_INET6:
3455 sin6 = (struct sockaddr_in6 *)addr;
3456 break;
3457 default:
3458 return -EINVAL;
3459 }
3460
3461 switch (param) {
3462 case ISCSI_PARAM_CONN_ADDRESS:
3463 case ISCSI_HOST_PARAM_IPADDRESS:
3464 if (sin)
3465 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3466 else
3467 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3468 break;
3469 case ISCSI_PARAM_CONN_PORT:
3470 case ISCSI_PARAM_LOCAL_PORT:
3471 if (sin)
3472 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3473 else
3474 len = sprintf(buf, "%hu\n",
3475 be16_to_cpu(sin6->sin6_port));
3476 break;
3477 default:
3478 return -EINVAL;
3479 }
3480
3481 return len;
3482 }
3483 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3484
3485 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3486 enum iscsi_param param, char *buf)
3487 {
3488 struct iscsi_conn *conn = cls_conn->dd_data;
3489 int len;
3490
3491 switch(param) {
3492 case ISCSI_PARAM_PING_TMO:
3493 len = sprintf(buf, "%u\n", conn->ping_timeout);
3494 break;
3495 case ISCSI_PARAM_RECV_TMO:
3496 len = sprintf(buf, "%u\n", conn->recv_timeout);
3497 break;
3498 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3499 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3500 break;
3501 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3502 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3503 break;
3504 case ISCSI_PARAM_HDRDGST_EN:
3505 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3506 break;
3507 case ISCSI_PARAM_DATADGST_EN:
3508 len = sprintf(buf, "%d\n", conn->datadgst_en);
3509 break;
3510 case ISCSI_PARAM_IFMARKER_EN:
3511 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3512 break;
3513 case ISCSI_PARAM_OFMARKER_EN:
3514 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3515 break;
3516 case ISCSI_PARAM_EXP_STATSN:
3517 len = sprintf(buf, "%u\n", conn->exp_statsn);
3518 break;
3519 case ISCSI_PARAM_PERSISTENT_PORT:
3520 len = sprintf(buf, "%d\n", conn->persistent_port);
3521 break;
3522 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3523 len = sprintf(buf, "%s\n", conn->persistent_address);
3524 break;
3525 case ISCSI_PARAM_STATSN:
3526 len = sprintf(buf, "%u\n", conn->statsn);
3527 break;
3528 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3529 len = sprintf(buf, "%u\n", conn->max_segment_size);
3530 break;
3531 case ISCSI_PARAM_KEEPALIVE_TMO:
3532 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3533 break;
3534 case ISCSI_PARAM_LOCAL_PORT:
3535 len = sprintf(buf, "%u\n", conn->local_port);
3536 break;
3537 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3538 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3539 break;
3540 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3541 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3542 break;
3543 case ISCSI_PARAM_TCP_WSF_DISABLE:
3544 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3545 break;
3546 case ISCSI_PARAM_TCP_TIMER_SCALE:
3547 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3548 break;
3549 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3550 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3551 break;
3552 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3553 len = sprintf(buf, "%u\n", conn->fragment_disable);
3554 break;
3555 case ISCSI_PARAM_IPV4_TOS:
3556 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3557 break;
3558 case ISCSI_PARAM_IPV6_TC:
3559 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3560 break;
3561 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3562 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3563 break;
3564 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3565 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3566 break;
3567 case ISCSI_PARAM_TCP_XMIT_WSF:
3568 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3569 break;
3570 case ISCSI_PARAM_TCP_RECV_WSF:
3571 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3572 break;
3573 case ISCSI_PARAM_LOCAL_IPADDR:
3574 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3575 break;
3576 default:
3577 return -ENOSYS;
3578 }
3579
3580 return len;
3581 }
3582 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3583
3584 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3585 char *buf)
3586 {
3587 struct iscsi_host *ihost = shost_priv(shost);
3588 int len;
3589
3590 switch (param) {
3591 case ISCSI_HOST_PARAM_NETDEV_NAME:
3592 len = sprintf(buf, "%s\n", ihost->netdev);
3593 break;
3594 case ISCSI_HOST_PARAM_HWADDRESS:
3595 len = sprintf(buf, "%s\n", ihost->hwaddress);
3596 break;
3597 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3598 len = sprintf(buf, "%s\n", ihost->initiatorname);
3599 break;
3600 default:
3601 return -ENOSYS;
3602 }
3603
3604 return len;
3605 }
3606 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3607
3608 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3609 char *buf, int buflen)
3610 {
3611 struct iscsi_host *ihost = shost_priv(shost);
3612
3613 switch (param) {
3614 case ISCSI_HOST_PARAM_NETDEV_NAME:
3615 return iscsi_switch_str_param(&ihost->netdev, buf);
3616 case ISCSI_HOST_PARAM_HWADDRESS:
3617 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3618 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3619 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3620 default:
3621 return -ENOSYS;
3622 }
3623
3624 return 0;
3625 }
3626 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3627
3628 MODULE_AUTHOR("Mike Christie");
3629 MODULE_DESCRIPTION("iSCSI library functions");
3630 MODULE_LICENSE("GPL");
Linux with added FPC-III support