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parisc iommu: fix panic due to trying to allocate too large region
[linux/fpc-iii.git] / drivers / scsi / libiscsi.c
blobf91d41788ce4b3ef330cb11f437dca3bf4952ffc
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 * if the window closed with IO queued, then kick the
117 * xmit thread
118 */
119 if (!list_empty(&session->leadconn->cmdqueue) ||
120 !list_empty(&session->leadconn->mgmtqueue))
121 iscsi_conn_queue_work(session->leadconn);
122 }
123 }
124
125 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
126 {
127 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
128 be32_to_cpu(hdr->max_cmdsn));
129 }
130 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
131
132 /**
133 * iscsi_prep_data_out_pdu - initialize Data-Out
134 * @task: scsi command task
135 * @r2t: R2T info
136 * @hdr: iscsi data in pdu
137 *
138 * Notes:
139 * Initialize Data-Out within this R2T sequence and finds
140 * proper data_offset within this SCSI command.
141 *
142 * This function is called with connection lock taken.
143 **/
144 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
145 struct iscsi_data *hdr)
146 {
147 struct iscsi_conn *conn = task->conn;
148 unsigned int left = r2t->data_length - r2t->sent;
149
150 task->hdr_len = sizeof(struct iscsi_data);
151
152 memset(hdr, 0, sizeof(struct iscsi_data));
153 hdr->ttt = r2t->ttt;
154 hdr->datasn = cpu_to_be32(r2t->datasn);
155 r2t->datasn++;
156 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
157 hdr->lun = task->lun;
158 hdr->itt = task->hdr_itt;
159 hdr->exp_statsn = r2t->exp_statsn;
160 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
161 if (left > conn->max_xmit_dlength) {
162 hton24(hdr->dlength, conn->max_xmit_dlength);
163 r2t->data_count = conn->max_xmit_dlength;
164 hdr->flags = 0;
165 } else {
166 hton24(hdr->dlength, left);
167 r2t->data_count = left;
168 hdr->flags = ISCSI_FLAG_CMD_FINAL;
169 }
170 conn->dataout_pdus_cnt++;
171 }
172 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
173
174 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
175 {
176 unsigned exp_len = task->hdr_len + len;
177
178 if (exp_len > task->hdr_max) {
179 WARN_ON(1);
180 return -EINVAL;
181 }
182
183 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
184 task->hdr_len = exp_len;
185 return 0;
186 }
187
188 /*
189 * make an extended cdb AHS
190 */
191 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
192 {
193 struct scsi_cmnd *cmd = task->sc;
194 unsigned rlen, pad_len;
195 unsigned short ahslength;
196 struct iscsi_ecdb_ahdr *ecdb_ahdr;
197 int rc;
198
199 ecdb_ahdr = iscsi_next_hdr(task);
200 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
201
202 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
203 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
204
205 pad_len = iscsi_padding(rlen);
206
207 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
208 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
209 if (rc)
210 return rc;
211
212 if (pad_len)
213 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
214
215 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
216 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
217 ecdb_ahdr->reserved = 0;
218 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
219
220 ISCSI_DBG_SESSION(task->conn->session,
221 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
222 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
223 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
224 task->hdr_len);
225 return 0;
226 }
227
228 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
229 {
230 struct scsi_cmnd *sc = task->sc;
231 struct iscsi_rlength_ahdr *rlen_ahdr;
232 int rc;
233
234 rlen_ahdr = iscsi_next_hdr(task);
235 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
236 if (rc)
237 return rc;
238
239 rlen_ahdr->ahslength =
240 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
241 sizeof(rlen_ahdr->reserved));
242 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
243 rlen_ahdr->reserved = 0;
244 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
245
246 ISCSI_DBG_SESSION(task->conn->session,
247 "bidi-in rlen_ahdr->read_length(%d) "
248 "rlen_ahdr->ahslength(%d)\n",
249 be32_to_cpu(rlen_ahdr->read_length),
250 be16_to_cpu(rlen_ahdr->ahslength));
251 return 0;
252 }
253
254 /**
255 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
256 * @task: iscsi task
257 * @opcode: opcode to check for
258 *
259 * During TMF a task has to be checked if it's affected.
260 * All unrelated I/O can be passed through, but I/O to the
261 * affected LUN should be restricted.
262 * If 'fast_abort' is set we won't be sending any I/O to the
263 * affected LUN.
264 * Otherwise the target is waiting for all TTTs to be completed,
265 * so we have to send all outstanding Data-Out PDUs to the target.
266 */
267 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
268 {
269 struct iscsi_conn *conn = task->conn;
270 struct iscsi_tm *tmf = &conn->tmhdr;
271 unsigned int hdr_lun;
272
273 if (conn->tmf_state == TMF_INITIAL)
274 return 0;
275
276 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
277 return 0;
278
279 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
280 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
281 /*
282 * Allow PDUs for unrelated LUNs
283 */
284 hdr_lun = scsilun_to_int(&tmf->lun);
285 if (hdr_lun != task->sc->device->lun)
286 return 0;
287 /* fall through */
288 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
289 /*
290 * Fail all SCSI cmd PDUs
291 */
292 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
293 iscsi_conn_printk(KERN_INFO, conn,
294 "task [op %x/%x itt "
295 "0x%x/0x%x] "
296 "rejected.\n",
297 task->hdr->opcode, opcode,
298 task->itt, task->hdr_itt);
299 return -EACCES;
300 }
301 /*
302 * And also all data-out PDUs in response to R2T
303 * if fast_abort is set.
304 */
305 if (conn->session->fast_abort) {
306 iscsi_conn_printk(KERN_INFO, conn,
307 "task [op %x/%x itt "
308 "0x%x/0x%x] fast abort.\n",
309 task->hdr->opcode, opcode,
310 task->itt, task->hdr_itt);
311 return -EACCES;
312 }
313 break;
314 case ISCSI_TM_FUNC_ABORT_TASK:
315 /*
316 * the caller has already checked if the task
317 * they want to abort was in the pending queue so if
318 * we are here the cmd pdu has gone out already, and
319 * we will only hit this for data-outs
320 */
321 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
322 task->hdr_itt == tmf->rtt) {
323 ISCSI_DBG_SESSION(conn->session,
324 "Preventing task %x/%x from sending "
325 "data-out due to abort task in "
326 "progress\n", task->itt,
327 task->hdr_itt);
328 return -EACCES;
329 }
330 break;
331 }
332
333 return 0;
334 }
335
336 /**
337 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
338 * @task: iscsi task
339 *
340 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
341 * fields like dlength or final based on how much data it sends
342 */
343 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
344 {
345 struct iscsi_conn *conn = task->conn;
346 struct iscsi_session *session = conn->session;
347 struct scsi_cmnd *sc = task->sc;
348 struct iscsi_scsi_req *hdr;
349 unsigned hdrlength, cmd_len;
350 itt_t itt;
351 int rc;
352
353 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
354 if (rc)
355 return rc;
356
357 if (conn->session->tt->alloc_pdu) {
358 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
359 if (rc)
360 return rc;
361 }
362 hdr = (struct iscsi_scsi_req *)task->hdr;
363 itt = hdr->itt;
364 memset(hdr, 0, sizeof(*hdr));
365
366 if (session->tt->parse_pdu_itt)
367 hdr->itt = task->hdr_itt = itt;
368 else
369 hdr->itt = task->hdr_itt = build_itt(task->itt,
370 task->conn->session->age);
371 task->hdr_len = 0;
372 rc = iscsi_add_hdr(task, sizeof(*hdr));
373 if (rc)
374 return rc;
375 hdr->opcode = ISCSI_OP_SCSI_CMD;
376 hdr->flags = ISCSI_ATTR_SIMPLE;
377 int_to_scsilun(sc->device->lun, &hdr->lun);
378 task->lun = hdr->lun;
379 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
380 cmd_len = sc->cmd_len;
381 if (cmd_len < ISCSI_CDB_SIZE)
382 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
383 else if (cmd_len > ISCSI_CDB_SIZE) {
384 rc = iscsi_prep_ecdb_ahs(task);
385 if (rc)
386 return rc;
387 cmd_len = ISCSI_CDB_SIZE;
388 }
389 memcpy(hdr->cdb, sc->cmnd, cmd_len);
390
391 task->imm_count = 0;
392 if (scsi_bidi_cmnd(sc)) {
393 hdr->flags |= ISCSI_FLAG_CMD_READ;
394 rc = iscsi_prep_bidi_ahs(task);
395 if (rc)
396 return rc;
397 }
398 if (sc->sc_data_direction == DMA_TO_DEVICE) {
399 unsigned out_len = scsi_out(sc)->length;
400 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
401
402 hdr->data_length = cpu_to_be32(out_len);
403 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
404 /*
405 * Write counters:
406 *
407 * imm_count bytes to be sent right after
408 * SCSI PDU Header
409 *
410 * unsol_count bytes(as Data-Out) to be sent
411 * without R2T ack right after
412 * immediate data
413 *
414 * r2t data_length bytes to be sent via R2T ack's
415 *
416 * pad_count bytes to be sent as zero-padding
417 */
418 memset(r2t, 0, sizeof(*r2t));
419
420 if (session->imm_data_en) {
421 if (out_len >= session->first_burst)
422 task->imm_count = min(session->first_burst,
423 conn->max_xmit_dlength);
424 else
425 task->imm_count = min(out_len,
426 conn->max_xmit_dlength);
427 hton24(hdr->dlength, task->imm_count);
428 } else
429 zero_data(hdr->dlength);
430
431 if (!session->initial_r2t_en) {
432 r2t->data_length = min(session->first_burst, out_len) -
433 task->imm_count;
434 r2t->data_offset = task->imm_count;
435 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
436 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
437 }
438
439 if (!task->unsol_r2t.data_length)
440 /* No unsolicit Data-Out's */
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 } else {
443 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
444 zero_data(hdr->dlength);
445 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
446
447 if (sc->sc_data_direction == DMA_FROM_DEVICE)
448 hdr->flags |= ISCSI_FLAG_CMD_READ;
449 }
450
451 /* calculate size of additional header segments (AHSs) */
452 hdrlength = task->hdr_len - sizeof(*hdr);
453
454 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
455 hdrlength /= ISCSI_PAD_LEN;
456
457 WARN_ON(hdrlength >= 256);
458 hdr->hlength = hdrlength & 0xFF;
459 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
460
461 if (session->tt->init_task && session->tt->init_task(task))
462 return -EIO;
463
464 task->state = ISCSI_TASK_RUNNING;
465 session->cmdsn++;
466
467 conn->scsicmd_pdus_cnt++;
468 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
469 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
470 scsi_bidi_cmnd(sc) ? "bidirectional" :
471 sc->sc_data_direction == DMA_TO_DEVICE ?
472 "write" : "read", conn->id, sc, sc->cmnd[0],
473 task->itt, scsi_bufflen(sc),
474 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
475 session->cmdsn,
476 session->max_cmdsn - session->exp_cmdsn + 1);
477 return 0;
478 }
479
480 /**
481 * iscsi_free_task - free a task
482 * @task: iscsi cmd task
483 *
484 * Must be called with session lock.
485 * This function returns the scsi command to scsi-ml or cleans
486 * up mgmt tasks then returns the task to the pool.
487 */
488 static void iscsi_free_task(struct iscsi_task *task)
489 {
490 struct iscsi_conn *conn = task->conn;
491 struct iscsi_session *session = conn->session;
492 struct scsi_cmnd *sc = task->sc;
493 int oldstate = task->state;
494
495 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
496 task->itt, task->state, task->sc);
497
498 session->tt->cleanup_task(task);
499 task->state = ISCSI_TASK_FREE;
500 task->sc = NULL;
501 /*
502 * login task is preallocated so do not free
503 */
504 if (conn->login_task == task)
505 return;
506
507 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
508
509 if (sc) {
510 /* SCSI eh reuses commands to verify us */
511 sc->SCp.ptr = NULL;
512 /*
513 * queue command may call this to free the task, so
514 * it will decide how to return sc to scsi-ml.
515 */
516 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
517 sc->scsi_done(sc);
518 }
519 }
520
521 void __iscsi_get_task(struct iscsi_task *task)
522 {
523 atomic_inc(&task->refcount);
524 }
525 EXPORT_SYMBOL_GPL(__iscsi_get_task);
526
527 void __iscsi_put_task(struct iscsi_task *task)
528 {
529 if (atomic_dec_and_test(&task->refcount))
530 iscsi_free_task(task);
531 }
532 EXPORT_SYMBOL_GPL(__iscsi_put_task);
533
534 void iscsi_put_task(struct iscsi_task *task)
535 {
536 struct iscsi_session *session = task->conn->session;
537
538 spin_lock_bh(&session->lock);
539 __iscsi_put_task(task);
540 spin_unlock_bh(&session->lock);
541 }
542 EXPORT_SYMBOL_GPL(iscsi_put_task);
543
544 /**
545 * iscsi_complete_task - finish a task
546 * @task: iscsi cmd task
547 * @state: state to complete task with
548 *
549 * Must be called with session lock.
550 */
551 static void iscsi_complete_task(struct iscsi_task *task, int state)
552 {
553 struct iscsi_conn *conn = task->conn;
554
555 ISCSI_DBG_SESSION(conn->session,
556 "complete task itt 0x%x state %d sc %p\n",
557 task->itt, task->state, task->sc);
558 if (task->state == ISCSI_TASK_COMPLETED ||
559 task->state == ISCSI_TASK_ABRT_TMF ||
560 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
561 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
562 return;
563 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
564 task->state = state;
565
566 if (!list_empty(&task->running))
567 list_del_init(&task->running);
568
569 if (conn->task == task)
570 conn->task = NULL;
571
572 if (conn->ping_task == task)
573 conn->ping_task = NULL;
574
575 /* release get from queueing */
576 __iscsi_put_task(task);
577 }
578
579 /**
580 * iscsi_complete_scsi_task - finish scsi task normally
581 * @task: iscsi task for scsi cmd
582 * @exp_cmdsn: expected cmd sn in cpu format
583 * @max_cmdsn: max cmd sn in cpu format
584 *
585 * This is used when drivers do not need or cannot perform
586 * lower level pdu processing.
587 *
588 * Called with session lock
589 */
590 void iscsi_complete_scsi_task(struct iscsi_task *task,
591 uint32_t exp_cmdsn, uint32_t max_cmdsn)
592 {
593 struct iscsi_conn *conn = task->conn;
594
595 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
596
597 conn->last_recv = jiffies;
598 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
599 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
600 }
601 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
602
603
604 /*
605 * session lock must be held and if not called for a task that is
606 * still pending or from the xmit thread, then xmit thread must
607 * be suspended.
608 */
609 static void fail_scsi_task(struct iscsi_task *task, int err)
610 {
611 struct iscsi_conn *conn = task->conn;
612 struct scsi_cmnd *sc;
613 int state;
614
615 /*
616 * if a command completes and we get a successful tmf response
617 * we will hit this because the scsi eh abort code does not take
618 * a ref to the task.
619 */
620 sc = task->sc;
621 if (!sc)
622 return;
623
624 if (task->state == ISCSI_TASK_PENDING) {
625 /*
626 * cmd never made it to the xmit thread, so we should not count
627 * the cmd in the sequencing
628 */
629 conn->session->queued_cmdsn--;
630 /* it was never sent so just complete like normal */
631 state = ISCSI_TASK_COMPLETED;
632 } else if (err == DID_TRANSPORT_DISRUPTED)
633 state = ISCSI_TASK_ABRT_SESS_RECOV;
634 else
635 state = ISCSI_TASK_ABRT_TMF;
636
637 sc->result = err << 16;
638 if (!scsi_bidi_cmnd(sc))
639 scsi_set_resid(sc, scsi_bufflen(sc));
640 else {
641 scsi_out(sc)->resid = scsi_out(sc)->length;
642 scsi_in(sc)->resid = scsi_in(sc)->length;
643 }
644
645 iscsi_complete_task(task, state);
646 }
647
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 __iscsi_put_task(task);
794 return NULL;
795 }
796
797 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
798 char *data, uint32_t data_size)
799 {
800 struct iscsi_conn *conn = cls_conn->dd_data;
801 struct iscsi_session *session = conn->session;
802 int err = 0;
803
804 spin_lock_bh(&session->lock);
805 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
806 err = -EPERM;
807 spin_unlock_bh(&session->lock);
808 return err;
809 }
810 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
811
812 /**
813 * iscsi_cmd_rsp - SCSI Command Response processing
814 * @conn: iscsi connection
815 * @hdr: iscsi header
816 * @task: scsi command task
817 * @data: cmd data buffer
818 * @datalen: len of buffer
819 *
820 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
821 * then completes the command and task.
822 **/
823 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
824 struct iscsi_task *task, char *data,
825 int datalen)
826 {
827 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
828 struct iscsi_session *session = conn->session;
829 struct scsi_cmnd *sc = task->sc;
830
831 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
832 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
833
834 sc->result = (DID_OK << 16) | rhdr->cmd_status;
835
836 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
837 sc->result = DID_ERROR << 16;
838 goto out;
839 }
840
841 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
842 uint16_t senselen;
843
844 if (datalen < 2) {
845 invalid_datalen:
846 iscsi_conn_printk(KERN_ERR, conn,
847 "Got CHECK_CONDITION but invalid data "
848 "buffer size of %d\n", datalen);
849 sc->result = DID_BAD_TARGET << 16;
850 goto out;
851 }
852
853 senselen = get_unaligned_be16(data);
854 if (datalen < senselen)
855 goto invalid_datalen;
856
857 memcpy(sc->sense_buffer, data + 2,
858 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
859 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
860 min_t(uint16_t, senselen,
861 SCSI_SENSE_BUFFERSIZE));
862 }
863
864 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
865 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
866 int res_count = be32_to_cpu(rhdr->bi_residual_count);
867
868 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
869 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
870 res_count <= scsi_in(sc)->length))
871 scsi_in(sc)->resid = res_count;
872 else
873 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
874 }
875
876 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
877 ISCSI_FLAG_CMD_OVERFLOW)) {
878 int res_count = be32_to_cpu(rhdr->residual_count);
879
880 if (res_count > 0 &&
881 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
882 res_count <= scsi_bufflen(sc)))
883 /* write side for bidi or uni-io set_resid */
884 scsi_set_resid(sc, res_count);
885 else
886 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
887 }
888 out:
889 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
890 sc, sc->result, task->itt);
891 conn->scsirsp_pdus_cnt++;
892 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
893 }
894
895 /**
896 * iscsi_data_in_rsp - SCSI Data-In Response processing
897 * @conn: iscsi connection
898 * @hdr: iscsi pdu
899 * @task: scsi command task
900 **/
901 static void
902 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
903 struct iscsi_task *task)
904 {
905 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
906 struct scsi_cmnd *sc = task->sc;
907
908 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
909 return;
910
911 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
912 sc->result = (DID_OK << 16) | rhdr->cmd_status;
913 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
914 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
915 ISCSI_FLAG_DATA_OVERFLOW)) {
916 int res_count = be32_to_cpu(rhdr->residual_count);
917
918 if (res_count > 0 &&
919 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
920 res_count <= scsi_in(sc)->length))
921 scsi_in(sc)->resid = res_count;
922 else
923 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
924 }
925
926 ISCSI_DBG_SESSION(conn->session, "data in with status done "
927 "[sc %p res %d itt 0x%x]\n",
928 sc, sc->result, task->itt);
929 conn->scsirsp_pdus_cnt++;
930 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
931 }
932
933 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
934 {
935 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
936
937 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
938 conn->tmfrsp_pdus_cnt++;
939
940 if (conn->tmf_state != TMF_QUEUED)
941 return;
942
943 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
944 conn->tmf_state = TMF_SUCCESS;
945 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
946 conn->tmf_state = TMF_NOT_FOUND;
947 else
948 conn->tmf_state = TMF_FAILED;
949 wake_up(&conn->ehwait);
950 }
951
952 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
953 {
954 struct iscsi_nopout hdr;
955 struct iscsi_task *task;
956
957 if (!rhdr && conn->ping_task)
958 return;
959
960 memset(&hdr, 0, sizeof(struct iscsi_nopout));
961 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
962 hdr.flags = ISCSI_FLAG_CMD_FINAL;
963
964 if (rhdr) {
965 hdr.lun = rhdr->lun;
966 hdr.ttt = rhdr->ttt;
967 hdr.itt = RESERVED_ITT;
968 } else
969 hdr.ttt = RESERVED_ITT;
970
971 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
972 if (!task)
973 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
974 else if (!rhdr) {
975 /* only track our nops */
976 conn->ping_task = task;
977 conn->last_ping = jiffies;
978 }
979 }
980
981 static int iscsi_nop_out_rsp(struct iscsi_task *task,
982 struct iscsi_nopin *nop, char *data, int datalen)
983 {
984 struct iscsi_conn *conn = task->conn;
985 int rc = 0;
986
987 if (conn->ping_task != task) {
988 /*
989 * If this is not in response to one of our
990 * nops then it must be from userspace.
991 */
992 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
993 data, datalen))
994 rc = ISCSI_ERR_CONN_FAILED;
995 } else
996 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
997 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
998 return rc;
999 }
1000
1001 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1002 char *data, int datalen)
1003 {
1004 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1005 struct iscsi_hdr rejected_pdu;
1006 int opcode, rc = 0;
1007
1008 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1009
1010 if (ntoh24(reject->dlength) > datalen ||
1011 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1012 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1013 "pdu. Invalid data length (pdu dlength "
1014 "%u, datalen %d\n", ntoh24(reject->dlength),
1015 datalen);
1016 return ISCSI_ERR_PROTO;
1017 }
1018 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1019 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1020
1021 switch (reject->reason) {
1022 case ISCSI_REASON_DATA_DIGEST_ERROR:
1023 iscsi_conn_printk(KERN_ERR, conn,
1024 "pdu (op 0x%x itt 0x%x) rejected "
1025 "due to DataDigest error.\n",
1026 rejected_pdu.itt, opcode);
1027 break;
1028 case ISCSI_REASON_IMM_CMD_REJECT:
1029 iscsi_conn_printk(KERN_ERR, conn,
1030 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1031 "immediate commands.\n",
1032 rejected_pdu.itt, opcode);
1033 /*
1034 * We only send one TMF at a time so if the target could not
1035 * handle it, then it should get fixed (RFC mandates that
1036 * a target can handle one immediate TMF per conn).
1037 *
1038 * For nops-outs, we could have sent more than one if
1039 * the target is sending us lots of nop-ins
1040 */
1041 if (opcode != ISCSI_OP_NOOP_OUT)
1042 return 0;
1043
1044 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1045 /*
1046 * nop-out in response to target's nop-out rejected.
1047 * Just resend.
1048 */
1049 iscsi_send_nopout(conn,
1050 (struct iscsi_nopin*)&rejected_pdu);
1051 else {
1052 struct iscsi_task *task;
1053 /*
1054 * Our nop as ping got dropped. We know the target
1055 * and transport are ok so just clean up
1056 */
1057 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1058 if (!task) {
1059 iscsi_conn_printk(KERN_ERR, conn,
1060 "Invalid pdu reject. Could "
1061 "not lookup rejected task.\n");
1062 rc = ISCSI_ERR_BAD_ITT;
1063 } else
1064 rc = iscsi_nop_out_rsp(task,
1065 (struct iscsi_nopin*)&rejected_pdu,
1066 NULL, 0);
1067 }
1068 break;
1069 default:
1070 iscsi_conn_printk(KERN_ERR, conn,
1071 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1072 "code 0x%x\n", rejected_pdu.itt,
1073 rejected_pdu.opcode, reject->reason);
1074 break;
1075 }
1076 return rc;
1077 }
1078
1079 /**
1080 * iscsi_itt_to_task - look up task by itt
1081 * @conn: iscsi connection
1082 * @itt: itt
1083 *
1084 * This should be used for mgmt tasks like login and nops, or if
1085 * the LDD's itt space does not include the session age.
1086 *
1087 * The session lock must be held.
1088 */
1089 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1090 {
1091 struct iscsi_session *session = conn->session;
1092 int i;
1093
1094 if (itt == RESERVED_ITT)
1095 return NULL;
1096
1097 if (session->tt->parse_pdu_itt)
1098 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1099 else
1100 i = get_itt(itt);
1101 if (i >= session->cmds_max)
1102 return NULL;
1103
1104 return session->cmds[i];
1105 }
1106 EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1107
1108 /**
1109 * __iscsi_complete_pdu - complete pdu
1110 * @conn: iscsi conn
1111 * @hdr: iscsi header
1112 * @data: data buffer
1113 * @datalen: len of data buffer
1114 *
1115 * Completes pdu processing by freeing any resources allocated at
1116 * queuecommand or send generic. session lock must be held and verify
1117 * itt must have been called.
1118 */
1119 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1120 char *data, int datalen)
1121 {
1122 struct iscsi_session *session = conn->session;
1123 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1124 struct iscsi_task *task;
1125 uint32_t itt;
1126
1127 conn->last_recv = jiffies;
1128 rc = iscsi_verify_itt(conn, hdr->itt);
1129 if (rc)
1130 return rc;
1131
1132 if (hdr->itt != RESERVED_ITT)
1133 itt = get_itt(hdr->itt);
1134 else
1135 itt = ~0U;
1136
1137 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1138 opcode, conn->id, itt, datalen);
1139
1140 if (itt == ~0U) {
1141 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1142
1143 switch(opcode) {
1144 case ISCSI_OP_NOOP_IN:
1145 if (datalen) {
1146 rc = ISCSI_ERR_PROTO;
1147 break;
1148 }
1149
1150 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1151 break;
1152
1153 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1154 break;
1155 case ISCSI_OP_REJECT:
1156 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1157 break;
1158 case ISCSI_OP_ASYNC_EVENT:
1159 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1160 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1161 rc = ISCSI_ERR_CONN_FAILED;
1162 break;
1163 default:
1164 rc = ISCSI_ERR_BAD_OPCODE;
1165 break;
1166 }
1167 goto out;
1168 }
1169
1170 switch(opcode) {
1171 case ISCSI_OP_SCSI_CMD_RSP:
1172 case ISCSI_OP_SCSI_DATA_IN:
1173 task = iscsi_itt_to_ctask(conn, hdr->itt);
1174 if (!task)
1175 return ISCSI_ERR_BAD_ITT;
1176 task->last_xfer = jiffies;
1177 break;
1178 case ISCSI_OP_R2T:
1179 /*
1180 * LLD handles R2Ts if they need to.
1181 */
1182 return 0;
1183 case ISCSI_OP_LOGOUT_RSP:
1184 case ISCSI_OP_LOGIN_RSP:
1185 case ISCSI_OP_TEXT_RSP:
1186 case ISCSI_OP_SCSI_TMFUNC_RSP:
1187 case ISCSI_OP_NOOP_IN:
1188 task = iscsi_itt_to_task(conn, hdr->itt);
1189 if (!task)
1190 return ISCSI_ERR_BAD_ITT;
1191 break;
1192 default:
1193 return ISCSI_ERR_BAD_OPCODE;
1194 }
1195
1196 switch(opcode) {
1197 case ISCSI_OP_SCSI_CMD_RSP:
1198 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1199 break;
1200 case ISCSI_OP_SCSI_DATA_IN:
1201 iscsi_data_in_rsp(conn, hdr, task);
1202 break;
1203 case ISCSI_OP_LOGOUT_RSP:
1204 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1205 if (datalen) {
1206 rc = ISCSI_ERR_PROTO;
1207 break;
1208 }
1209 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1210 goto recv_pdu;
1211 case ISCSI_OP_LOGIN_RSP:
1212 case ISCSI_OP_TEXT_RSP:
1213 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1214 /*
1215 * login related PDU's exp_statsn is handled in
1216 * userspace
1217 */
1218 goto recv_pdu;
1219 case ISCSI_OP_SCSI_TMFUNC_RSP:
1220 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1221 if (datalen) {
1222 rc = ISCSI_ERR_PROTO;
1223 break;
1224 }
1225
1226 iscsi_tmf_rsp(conn, hdr);
1227 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1228 break;
1229 case ISCSI_OP_NOOP_IN:
1230 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1231 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1232 rc = ISCSI_ERR_PROTO;
1233 break;
1234 }
1235 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1236
1237 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1238 data, datalen);
1239 break;
1240 default:
1241 rc = ISCSI_ERR_BAD_OPCODE;
1242 break;
1243 }
1244
1245 out:
1246 return rc;
1247 recv_pdu:
1248 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1249 rc = ISCSI_ERR_CONN_FAILED;
1250 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1251 return rc;
1252 }
1253 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1254
1255 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1256 char *data, int datalen)
1257 {
1258 int rc;
1259
1260 spin_lock(&conn->session->lock);
1261 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1262 spin_unlock(&conn->session->lock);
1263 return rc;
1264 }
1265 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1266
1267 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1268 {
1269 struct iscsi_session *session = conn->session;
1270 int age = 0, i = 0;
1271
1272 if (itt == RESERVED_ITT)
1273 return 0;
1274
1275 if (session->tt->parse_pdu_itt)
1276 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1277 else {
1278 i = get_itt(itt);
1279 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1280 }
1281
1282 if (age != session->age) {
1283 iscsi_conn_printk(KERN_ERR, conn,
1284 "received itt %x expected session age (%x)\n",
1285 (__force u32)itt, session->age);
1286 return ISCSI_ERR_BAD_ITT;
1287 }
1288
1289 if (i >= session->cmds_max) {
1290 iscsi_conn_printk(KERN_ERR, conn,
1291 "received invalid itt index %u (max cmds "
1292 "%u.\n", i, session->cmds_max);
1293 return ISCSI_ERR_BAD_ITT;
1294 }
1295 return 0;
1296 }
1297 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1298
1299 /**
1300 * iscsi_itt_to_ctask - look up ctask by itt
1301 * @conn: iscsi connection
1302 * @itt: itt
1303 *
1304 * This should be used for cmd tasks.
1305 *
1306 * The session lock must be held.
1307 */
1308 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1309 {
1310 struct iscsi_task *task;
1311
1312 if (iscsi_verify_itt(conn, itt))
1313 return NULL;
1314
1315 task = iscsi_itt_to_task(conn, itt);
1316 if (!task || !task->sc)
1317 return NULL;
1318
1319 if (task->sc->SCp.phase != conn->session->age) {
1320 iscsi_session_printk(KERN_ERR, conn->session,
1321 "task's session age %d, expected %d\n",
1322 task->sc->SCp.phase, conn->session->age);
1323 return NULL;
1324 }
1325
1326 return task;
1327 }
1328 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1329
1330 void iscsi_session_failure(struct iscsi_session *session,
1331 enum iscsi_err err)
1332 {
1333 struct iscsi_conn *conn;
1334 struct device *dev;
1335
1336 spin_lock_bh(&session->lock);
1337 conn = session->leadconn;
1338 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1339 spin_unlock_bh(&session->lock);
1340 return;
1341 }
1342
1343 dev = get_device(&conn->cls_conn->dev);
1344 spin_unlock_bh(&session->lock);
1345 if (!dev)
1346 return;
1347 /*
1348 * if the host is being removed bypass the connection
1349 * recovery initialization because we are going to kill
1350 * the session.
1351 */
1352 if (err == ISCSI_ERR_INVALID_HOST)
1353 iscsi_conn_error_event(conn->cls_conn, err);
1354 else
1355 iscsi_conn_failure(conn, err);
1356 put_device(dev);
1357 }
1358 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1359
1360 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1361 {
1362 struct iscsi_session *session = conn->session;
1363
1364 spin_lock_bh(&session->lock);
1365 if (session->state == ISCSI_STATE_FAILED) {
1366 spin_unlock_bh(&session->lock);
1367 return;
1368 }
1369
1370 if (conn->stop_stage == 0)
1371 session->state = ISCSI_STATE_FAILED;
1372 spin_unlock_bh(&session->lock);
1373
1374 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1375 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1376 iscsi_conn_error_event(conn->cls_conn, err);
1377 }
1378 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1379
1380 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1381 {
1382 struct iscsi_session *session = conn->session;
1383
1384 /*
1385 * Check for iSCSI window and take care of CmdSN wrap-around
1386 */
1387 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1388 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1389 "%u MaxCmdSN %u CmdSN %u/%u\n",
1390 session->exp_cmdsn, session->max_cmdsn,
1391 session->cmdsn, session->queued_cmdsn);
1392 return -ENOSPC;
1393 }
1394 return 0;
1395 }
1396
1397 static int iscsi_xmit_task(struct iscsi_conn *conn)
1398 {
1399 struct iscsi_task *task = conn->task;
1400 int rc;
1401
1402 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1403 return -ENODATA;
1404
1405 __iscsi_get_task(task);
1406 spin_unlock_bh(&conn->session->lock);
1407 rc = conn->session->tt->xmit_task(task);
1408 spin_lock_bh(&conn->session->lock);
1409 if (!rc) {
1410 /* done with this task */
1411 task->last_xfer = jiffies;
1412 conn->task = NULL;
1413 }
1414 __iscsi_put_task(task);
1415 return rc;
1416 }
1417
1418 /**
1419 * iscsi_requeue_task - requeue task to run from session workqueue
1420 * @task: task to requeue
1421 *
1422 * LLDs that need to run a task from the session workqueue should call
1423 * this. The session lock must be held. This should only be called
1424 * by software drivers.
1425 */
1426 void iscsi_requeue_task(struct iscsi_task *task)
1427 {
1428 struct iscsi_conn *conn = task->conn;
1429
1430 /*
1431 * this may be on the requeue list already if the xmit_task callout
1432 * is handling the r2ts while we are adding new ones
1433 */
1434 if (list_empty(&task->running))
1435 list_add_tail(&task->running, &conn->requeue);
1436 iscsi_conn_queue_work(conn);
1437 }
1438 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1439
1440 /**
1441 * iscsi_data_xmit - xmit any command into the scheduled connection
1442 * @conn: iscsi connection
1443 *
1444 * Notes:
1445 * The function can return -EAGAIN in which case the caller must
1446 * re-schedule it again later or recover. '0' return code means
1447 * successful xmit.
1448 **/
1449 static int iscsi_data_xmit(struct iscsi_conn *conn)
1450 {
1451 struct iscsi_task *task;
1452 int rc = 0;
1453
1454 spin_lock_bh(&conn->session->lock);
1455 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1456 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1457 spin_unlock_bh(&conn->session->lock);
1458 return -ENODATA;
1459 }
1460
1461 if (conn->task) {
1462 rc = iscsi_xmit_task(conn);
1463 if (rc)
1464 goto done;
1465 }
1466
1467 /*
1468 * process mgmt pdus like nops before commands since we should
1469 * only have one nop-out as a ping from us and targets should not
1470 * overflow us with nop-ins
1471 */
1472 check_mgmt:
1473 while (!list_empty(&conn->mgmtqueue)) {
1474 conn->task = list_entry(conn->mgmtqueue.next,
1475 struct iscsi_task, running);
1476 list_del_init(&conn->task->running);
1477 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1478 __iscsi_put_task(conn->task);
1479 conn->task = NULL;
1480 continue;
1481 }
1482 rc = iscsi_xmit_task(conn);
1483 if (rc)
1484 goto done;
1485 }
1486
1487 /* process pending command queue */
1488 while (!list_empty(&conn->cmdqueue)) {
1489 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1490 running);
1491 list_del_init(&conn->task->running);
1492 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1493 fail_scsi_task(conn->task, DID_IMM_RETRY);
1494 continue;
1495 }
1496 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1497 if (rc) {
1498 if (rc == -ENOMEM || rc == -EACCES) {
1499 list_add_tail(&conn->task->running,
1500 &conn->cmdqueue);
1501 conn->task = NULL;
1502 goto done;
1503 } else
1504 fail_scsi_task(conn->task, DID_ABORT);
1505 continue;
1506 }
1507 rc = iscsi_xmit_task(conn);
1508 if (rc)
1509 goto done;
1510 /*
1511 * we could continuously get new task requests so
1512 * we need to check the mgmt queue for nops that need to
1513 * be sent to aviod starvation
1514 */
1515 if (!list_empty(&conn->mgmtqueue))
1516 goto check_mgmt;
1517 }
1518
1519 while (!list_empty(&conn->requeue)) {
1520 /*
1521 * we always do fastlogout - conn stop code will clean up.
1522 */
1523 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1524 break;
1525
1526 task = list_entry(conn->requeue.next, struct iscsi_task,
1527 running);
1528 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1529 break;
1530
1531 conn->task = task;
1532 list_del_init(&conn->task->running);
1533 conn->task->state = ISCSI_TASK_RUNNING;
1534 rc = iscsi_xmit_task(conn);
1535 if (rc)
1536 goto done;
1537 if (!list_empty(&conn->mgmtqueue))
1538 goto check_mgmt;
1539 }
1540 spin_unlock_bh(&conn->session->lock);
1541 return -ENODATA;
1542
1543 done:
1544 spin_unlock_bh(&conn->session->lock);
1545 return rc;
1546 }
1547
1548 static void iscsi_xmitworker(struct work_struct *work)
1549 {
1550 struct iscsi_conn *conn =
1551 container_of(work, struct iscsi_conn, xmitwork);
1552 int rc;
1553 /*
1554 * serialize Xmit worker on a per-connection basis.
1555 */
1556 do {
1557 rc = iscsi_data_xmit(conn);
1558 } while (rc >= 0 || rc == -EAGAIN);
1559 }
1560
1561 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1562 struct scsi_cmnd *sc)
1563 {
1564 struct iscsi_task *task;
1565
1566 if (!kfifo_out(&conn->session->cmdpool.queue,
1567 (void *) &task, sizeof(void *)))
1568 return NULL;
1569
1570 sc->SCp.phase = conn->session->age;
1571 sc->SCp.ptr = (char *) task;
1572
1573 atomic_set(&task->refcount, 1);
1574 task->state = ISCSI_TASK_PENDING;
1575 task->conn = conn;
1576 task->sc = sc;
1577 task->have_checked_conn = false;
1578 task->last_timeout = jiffies;
1579 task->last_xfer = jiffies;
1580 INIT_LIST_HEAD(&task->running);
1581 return task;
1582 }
1583
1584 enum {
1585 FAILURE_BAD_HOST = 1,
1586 FAILURE_SESSION_FAILED,
1587 FAILURE_SESSION_FREED,
1588 FAILURE_WINDOW_CLOSED,
1589 FAILURE_OOM,
1590 FAILURE_SESSION_TERMINATE,
1591 FAILURE_SESSION_IN_RECOVERY,
1592 FAILURE_SESSION_RECOVERY_TIMEOUT,
1593 FAILURE_SESSION_LOGGING_OUT,
1594 FAILURE_SESSION_NOT_READY,
1595 };
1596
1597 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1598 {
1599 struct iscsi_cls_session *cls_session;
1600 struct iscsi_host *ihost;
1601 int reason = 0;
1602 struct iscsi_session *session;
1603 struct iscsi_conn *conn;
1604 struct iscsi_task *task = NULL;
1605
1606 sc->result = 0;
1607 sc->SCp.ptr = NULL;
1608
1609 ihost = shost_priv(host);
1610
1611 cls_session = starget_to_session(scsi_target(sc->device));
1612 session = cls_session->dd_data;
1613 spin_lock_bh(&session->lock);
1614
1615 reason = iscsi_session_chkready(cls_session);
1616 if (reason) {
1617 sc->result = reason;
1618 goto fault;
1619 }
1620
1621 if (session->state != ISCSI_STATE_LOGGED_IN) {
1622 /*
1623 * to handle the race between when we set the recovery state
1624 * and block the session we requeue here (commands could
1625 * be entering our queuecommand while a block is starting
1626 * up because the block code is not locked)
1627 */
1628 switch (session->state) {
1629 case ISCSI_STATE_FAILED:
1630 case ISCSI_STATE_IN_RECOVERY:
1631 reason = FAILURE_SESSION_IN_RECOVERY;
1632 sc->result = DID_IMM_RETRY << 16;
1633 break;
1634 case ISCSI_STATE_LOGGING_OUT:
1635 reason = FAILURE_SESSION_LOGGING_OUT;
1636 sc->result = DID_IMM_RETRY << 16;
1637 break;
1638 case ISCSI_STATE_RECOVERY_FAILED:
1639 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1640 sc->result = DID_TRANSPORT_FAILFAST << 16;
1641 break;
1642 case ISCSI_STATE_TERMINATE:
1643 reason = FAILURE_SESSION_TERMINATE;
1644 sc->result = DID_NO_CONNECT << 16;
1645 break;
1646 default:
1647 reason = FAILURE_SESSION_FREED;
1648 sc->result = DID_NO_CONNECT << 16;
1649 }
1650 goto fault;
1651 }
1652
1653 conn = session->leadconn;
1654 if (!conn) {
1655 reason = FAILURE_SESSION_FREED;
1656 sc->result = DID_NO_CONNECT << 16;
1657 goto fault;
1658 }
1659
1660 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1661 reason = FAILURE_SESSION_IN_RECOVERY;
1662 sc->result = DID_REQUEUE;
1663 goto fault;
1664 }
1665
1666 if (iscsi_check_cmdsn_window_closed(conn)) {
1667 reason = FAILURE_WINDOW_CLOSED;
1668 goto reject;
1669 }
1670
1671 task = iscsi_alloc_task(conn, sc);
1672 if (!task) {
1673 reason = FAILURE_OOM;
1674 goto reject;
1675 }
1676
1677 if (!ihost->workq) {
1678 reason = iscsi_prep_scsi_cmd_pdu(task);
1679 if (reason) {
1680 if (reason == -ENOMEM || reason == -EACCES) {
1681 reason = FAILURE_OOM;
1682 goto prepd_reject;
1683 } else {
1684 sc->result = DID_ABORT << 16;
1685 goto prepd_fault;
1686 }
1687 }
1688 if (session->tt->xmit_task(task)) {
1689 session->cmdsn--;
1690 reason = FAILURE_SESSION_NOT_READY;
1691 goto prepd_reject;
1692 }
1693 } else {
1694 list_add_tail(&task->running, &conn->cmdqueue);
1695 iscsi_conn_queue_work(conn);
1696 }
1697
1698 session->queued_cmdsn++;
1699 spin_unlock_bh(&session->lock);
1700 return 0;
1701
1702 prepd_reject:
1703 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1704 reject:
1705 spin_unlock_bh(&session->lock);
1706 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1707 sc->cmnd[0], reason);
1708 return SCSI_MLQUEUE_TARGET_BUSY;
1709
1710 prepd_fault:
1711 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1712 fault:
1713 spin_unlock_bh(&session->lock);
1714 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1715 sc->cmnd[0], reason);
1716 if (!scsi_bidi_cmnd(sc))
1717 scsi_set_resid(sc, scsi_bufflen(sc));
1718 else {
1719 scsi_out(sc)->resid = scsi_out(sc)->length;
1720 scsi_in(sc)->resid = scsi_in(sc)->length;
1721 }
1722 sc->scsi_done(sc);
1723 return 0;
1724 }
1725 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1726
1727 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
1728 {
1729 switch (reason) {
1730 case SCSI_QDEPTH_DEFAULT:
1731 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1732 break;
1733 case SCSI_QDEPTH_QFULL:
1734 scsi_track_queue_full(sdev, depth);
1735 break;
1736 case SCSI_QDEPTH_RAMP_UP:
1737 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1738 break;
1739 default:
1740 return -EOPNOTSUPP;
1741 }
1742 return sdev->queue_depth;
1743 }
1744 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1745
1746 int iscsi_target_alloc(struct scsi_target *starget)
1747 {
1748 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1749 struct iscsi_session *session = cls_session->dd_data;
1750
1751 starget->can_queue = session->scsi_cmds_max;
1752 return 0;
1753 }
1754 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1755
1756 static void iscsi_tmf_timedout(unsigned long data)
1757 {
1758 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1759 struct iscsi_session *session = conn->session;
1760
1761 spin_lock(&session->lock);
1762 if (conn->tmf_state == TMF_QUEUED) {
1763 conn->tmf_state = TMF_TIMEDOUT;
1764 ISCSI_DBG_EH(session, "tmf timedout\n");
1765 /* unblock eh_abort() */
1766 wake_up(&conn->ehwait);
1767 }
1768 spin_unlock(&session->lock);
1769 }
1770
1771 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1772 struct iscsi_tm *hdr, int age,
1773 int timeout)
1774 {
1775 struct iscsi_session *session = conn->session;
1776 struct iscsi_task *task;
1777
1778 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1779 NULL, 0);
1780 if (!task) {
1781 spin_unlock_bh(&session->lock);
1782 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1783 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1784 spin_lock_bh(&session->lock);
1785 return -EPERM;
1786 }
1787 conn->tmfcmd_pdus_cnt++;
1788 conn->tmf_timer.expires = timeout * HZ + jiffies;
1789 conn->tmf_timer.function = iscsi_tmf_timedout;
1790 conn->tmf_timer.data = (unsigned long)conn;
1791 add_timer(&conn->tmf_timer);
1792 ISCSI_DBG_EH(session, "tmf set timeout\n");
1793
1794 spin_unlock_bh(&session->lock);
1795 mutex_unlock(&session->eh_mutex);
1796
1797 /*
1798 * block eh thread until:
1799 *
1800 * 1) tmf response
1801 * 2) tmf timeout
1802 * 3) session is terminated or restarted or userspace has
1803 * given up on recovery
1804 */
1805 wait_event_interruptible(conn->ehwait, age != session->age ||
1806 session->state != ISCSI_STATE_LOGGED_IN ||
1807 conn->tmf_state != TMF_QUEUED);
1808 if (signal_pending(current))
1809 flush_signals(current);
1810 del_timer_sync(&conn->tmf_timer);
1811
1812 mutex_lock(&session->eh_mutex);
1813 spin_lock_bh(&session->lock);
1814 /* if the session drops it will clean up the task */
1815 if (age != session->age ||
1816 session->state != ISCSI_STATE_LOGGED_IN)
1817 return -ENOTCONN;
1818 return 0;
1819 }
1820
1821 /*
1822 * Fail commands. session lock held and recv side suspended and xmit
1823 * thread flushed
1824 */
1825 static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1826 int error)
1827 {
1828 struct iscsi_task *task;
1829 int i;
1830
1831 for (i = 0; i < conn->session->cmds_max; i++) {
1832 task = conn->session->cmds[i];
1833 if (!task->sc || task->state == ISCSI_TASK_FREE)
1834 continue;
1835
1836 if (lun != -1 && lun != task->sc->device->lun)
1837 continue;
1838
1839 ISCSI_DBG_SESSION(conn->session,
1840 "failing sc %p itt 0x%x state %d\n",
1841 task->sc, task->itt, task->state);
1842 fail_scsi_task(task, error);
1843 }
1844 }
1845
1846 /**
1847 * iscsi_suspend_queue - suspend iscsi_queuecommand
1848 * @conn: iscsi conn to stop queueing IO on
1849 *
1850 * This grabs the session lock to make sure no one is in
1851 * xmit_task/queuecommand, and then sets suspend to prevent
1852 * new commands from being queued. This only needs to be called
1853 * by offload drivers that need to sync a path like ep disconnect
1854 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1855 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1856 */
1857 void iscsi_suspend_queue(struct iscsi_conn *conn)
1858 {
1859 spin_lock_bh(&conn->session->lock);
1860 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1861 spin_unlock_bh(&conn->session->lock);
1862 }
1863 EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1864
1865 /**
1866 * iscsi_suspend_tx - suspend iscsi_data_xmit
1867 * @conn: iscsi conn tp stop processing IO on.
1868 *
1869 * This function sets the suspend bit to prevent iscsi_data_xmit
1870 * from sending new IO, and if work is queued on the xmit thread
1871 * it will wait for it to be completed.
1872 */
1873 void iscsi_suspend_tx(struct iscsi_conn *conn)
1874 {
1875 struct Scsi_Host *shost = conn->session->host;
1876 struct iscsi_host *ihost = shost_priv(shost);
1877
1878 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1879 if (ihost->workq)
1880 flush_workqueue(ihost->workq);
1881 }
1882 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1883
1884 static void iscsi_start_tx(struct iscsi_conn *conn)
1885 {
1886 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1887 iscsi_conn_queue_work(conn);
1888 }
1889
1890 /*
1891 * We want to make sure a ping is in flight. It has timed out.
1892 * And we are not busy processing a pdu that is making
1893 * progress but got started before the ping and is taking a while
1894 * to complete so the ping is just stuck behind it in a queue.
1895 */
1896 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1897 {
1898 if (conn->ping_task &&
1899 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1900 (conn->ping_timeout * HZ), jiffies))
1901 return 1;
1902 else
1903 return 0;
1904 }
1905
1906 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1907 {
1908 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1909 struct iscsi_task *task = NULL, *running_task;
1910 struct iscsi_cls_session *cls_session;
1911 struct iscsi_session *session;
1912 struct iscsi_conn *conn;
1913 int i;
1914
1915 cls_session = starget_to_session(scsi_target(sc->device));
1916 session = cls_session->dd_data;
1917
1918 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1919
1920 spin_lock(&session->lock);
1921 task = (struct iscsi_task *)sc->SCp.ptr;
1922 if (!task) {
1923 /*
1924 * Raced with completion. Blk layer has taken ownership
1925 * so let timeout code complete it now.
1926 */
1927 rc = BLK_EH_HANDLED;
1928 goto done;
1929 }
1930
1931 if (session->state != ISCSI_STATE_LOGGED_IN) {
1932 /*
1933 * We are probably in the middle of iscsi recovery so let
1934 * that complete and handle the error.
1935 */
1936 rc = BLK_EH_RESET_TIMER;
1937 goto done;
1938 }
1939
1940 conn = session->leadconn;
1941 if (!conn) {
1942 /* In the middle of shuting down */
1943 rc = BLK_EH_RESET_TIMER;
1944 goto done;
1945 }
1946
1947 /*
1948 * If we have sent (at least queued to the network layer) a pdu or
1949 * recvd one for the task since the last timeout ask for
1950 * more time. If on the next timeout we have not made progress
1951 * we can check if it is the task or connection when we send the
1952 * nop as a ping.
1953 */
1954 if (time_after(task->last_xfer, task->last_timeout)) {
1955 ISCSI_DBG_EH(session, "Command making progress. Asking "
1956 "scsi-ml for more time to complete. "
1957 "Last data xfer at %lu. Last timeout was at "
1958 "%lu\n.", task->last_xfer, task->last_timeout);
1959 task->have_checked_conn = false;
1960 rc = BLK_EH_RESET_TIMER;
1961 goto done;
1962 }
1963
1964 if (!conn->recv_timeout && !conn->ping_timeout)
1965 goto done;
1966 /*
1967 * if the ping timedout then we are in the middle of cleaning up
1968 * and can let the iscsi eh handle it
1969 */
1970 if (iscsi_has_ping_timed_out(conn)) {
1971 rc = BLK_EH_RESET_TIMER;
1972 goto done;
1973 }
1974
1975 for (i = 0; i < conn->session->cmds_max; i++) {
1976 running_task = conn->session->cmds[i];
1977 if (!running_task->sc || running_task == task ||
1978 running_task->state != ISCSI_TASK_RUNNING)
1979 continue;
1980
1981 /*
1982 * Only check if cmds started before this one have made
1983 * progress, or this could never fail
1984 */
1985 if (time_after(running_task->sc->jiffies_at_alloc,
1986 task->sc->jiffies_at_alloc))
1987 continue;
1988
1989 if (time_after(running_task->last_xfer, task->last_timeout)) {
1990 /*
1991 * This task has not made progress, but a task
1992 * started before us has transferred data since
1993 * we started/last-checked. We could be queueing
1994 * too many tasks or the LU is bad.
1995 *
1996 * If the device is bad the cmds ahead of us on
1997 * other devs will complete, and this loop will
1998 * eventually fail starting the scsi eh.
1999 */
2000 ISCSI_DBG_EH(session, "Command has not made progress "
2001 "but commands ahead of it have. "
2002 "Asking scsi-ml for more time to "
2003 "complete. Our last xfer vs running task "
2004 "last xfer %lu/%lu. Last check %lu.\n",
2005 task->last_xfer, running_task->last_xfer,
2006 task->last_timeout);
2007 rc = BLK_EH_RESET_TIMER;
2008 goto done;
2009 }
2010 }
2011
2012 /* Assumes nop timeout is shorter than scsi cmd timeout */
2013 if (task->have_checked_conn)
2014 goto done;
2015
2016 /*
2017 * Checking the transport already or nop from a cmd timeout still
2018 * running
2019 */
2020 if (conn->ping_task) {
2021 task->have_checked_conn = true;
2022 rc = BLK_EH_RESET_TIMER;
2023 goto done;
2024 }
2025
2026 /* Make sure there is a transport check done */
2027 iscsi_send_nopout(conn, NULL);
2028 task->have_checked_conn = true;
2029 rc = BLK_EH_RESET_TIMER;
2030
2031 done:
2032 if (task)
2033 task->last_timeout = jiffies;
2034 spin_unlock(&session->lock);
2035 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2036 "timer reset" : "nh");
2037 return rc;
2038 }
2039
2040 static void iscsi_check_transport_timeouts(unsigned long data)
2041 {
2042 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2043 struct iscsi_session *session = conn->session;
2044 unsigned long recv_timeout, next_timeout = 0, last_recv;
2045
2046 spin_lock(&session->lock);
2047 if (session->state != ISCSI_STATE_LOGGED_IN)
2048 goto done;
2049
2050 recv_timeout = conn->recv_timeout;
2051 if (!recv_timeout)
2052 goto done;
2053
2054 recv_timeout *= HZ;
2055 last_recv = conn->last_recv;
2056
2057 if (iscsi_has_ping_timed_out(conn)) {
2058 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2059 "expired, recv timeout %d, last rx %lu, "
2060 "last ping %lu, now %lu\n",
2061 conn->ping_timeout, conn->recv_timeout,
2062 last_recv, conn->last_ping, jiffies);
2063 spin_unlock(&session->lock);
2064 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2065 return;
2066 }
2067
2068 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2069 /* send a ping to try to provoke some traffic */
2070 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2071 iscsi_send_nopout(conn, NULL);
2072 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2073 } else
2074 next_timeout = last_recv + recv_timeout;
2075
2076 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2077 mod_timer(&conn->transport_timer, next_timeout);
2078 done:
2079 spin_unlock(&session->lock);
2080 }
2081
2082 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2083 struct iscsi_tm *hdr)
2084 {
2085 memset(hdr, 0, sizeof(*hdr));
2086 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2087 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2088 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2089 hdr->lun = task->lun;
2090 hdr->rtt = task->hdr_itt;
2091 hdr->refcmdsn = task->cmdsn;
2092 }
2093
2094 int iscsi_eh_abort(struct scsi_cmnd *sc)
2095 {
2096 struct iscsi_cls_session *cls_session;
2097 struct iscsi_session *session;
2098 struct iscsi_conn *conn;
2099 struct iscsi_task *task;
2100 struct iscsi_tm *hdr;
2101 int rc, age;
2102
2103 cls_session = starget_to_session(scsi_target(sc->device));
2104 session = cls_session->dd_data;
2105
2106 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2107
2108 mutex_lock(&session->eh_mutex);
2109 spin_lock_bh(&session->lock);
2110 /*
2111 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2112 * got the command.
2113 */
2114 if (!sc->SCp.ptr) {
2115 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2116 "it completed.\n");
2117 spin_unlock_bh(&session->lock);
2118 mutex_unlock(&session->eh_mutex);
2119 return SUCCESS;
2120 }
2121
2122 /*
2123 * If we are not logged in or we have started a new session
2124 * then let the host reset code handle this
2125 */
2126 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2127 sc->SCp.phase != session->age) {
2128 spin_unlock_bh(&session->lock);
2129 mutex_unlock(&session->eh_mutex);
2130 ISCSI_DBG_EH(session, "failing abort due to dropped "
2131 "session.\n");
2132 return FAILED;
2133 }
2134
2135 conn = session->leadconn;
2136 conn->eh_abort_cnt++;
2137 age = session->age;
2138
2139 task = (struct iscsi_task *)sc->SCp.ptr;
2140 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2141 sc, task->itt);
2142
2143 /* task completed before time out */
2144 if (!task->sc) {
2145 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2146 goto success;
2147 }
2148
2149 if (task->state == ISCSI_TASK_PENDING) {
2150 fail_scsi_task(task, DID_ABORT);
2151 goto success;
2152 }
2153
2154 /* only have one tmf outstanding at a time */
2155 if (conn->tmf_state != TMF_INITIAL)
2156 goto failed;
2157 conn->tmf_state = TMF_QUEUED;
2158
2159 hdr = &conn->tmhdr;
2160 iscsi_prep_abort_task_pdu(task, hdr);
2161
2162 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2163 rc = FAILED;
2164 goto failed;
2165 }
2166
2167 switch (conn->tmf_state) {
2168 case TMF_SUCCESS:
2169 spin_unlock_bh(&session->lock);
2170 /*
2171 * stop tx side incase the target had sent a abort rsp but
2172 * the initiator was still writing out data.
2173 */
2174 iscsi_suspend_tx(conn);
2175 /*
2176 * we do not stop the recv side because targets have been
2177 * good and have never sent us a successful tmf response
2178 * then sent more data for the cmd.
2179 */
2180 spin_lock_bh(&session->lock);
2181 fail_scsi_task(task, DID_ABORT);
2182 conn->tmf_state = TMF_INITIAL;
2183 memset(hdr, 0, sizeof(*hdr));
2184 spin_unlock_bh(&session->lock);
2185 iscsi_start_tx(conn);
2186 goto success_unlocked;
2187 case TMF_TIMEDOUT:
2188 spin_unlock_bh(&session->lock);
2189 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2190 goto failed_unlocked;
2191 case TMF_NOT_FOUND:
2192 if (!sc->SCp.ptr) {
2193 conn->tmf_state = TMF_INITIAL;
2194 memset(hdr, 0, sizeof(*hdr));
2195 /* task completed before tmf abort response */
2196 ISCSI_DBG_EH(session, "sc completed while abort in "
2197 "progress\n");
2198 goto success;
2199 }
2200 /* fall through */
2201 default:
2202 conn->tmf_state = TMF_INITIAL;
2203 goto failed;
2204 }
2205
2206 success:
2207 spin_unlock_bh(&session->lock);
2208 success_unlocked:
2209 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2210 sc, task->itt);
2211 mutex_unlock(&session->eh_mutex);
2212 return SUCCESS;
2213
2214 failed:
2215 spin_unlock_bh(&session->lock);
2216 failed_unlocked:
2217 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2218 task ? task->itt : 0);
2219 mutex_unlock(&session->eh_mutex);
2220 return FAILED;
2221 }
2222 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2223
2224 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2225 {
2226 memset(hdr, 0, sizeof(*hdr));
2227 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2228 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2229 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2230 int_to_scsilun(sc->device->lun, &hdr->lun);
2231 hdr->rtt = RESERVED_ITT;
2232 }
2233
2234 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2235 {
2236 struct iscsi_cls_session *cls_session;
2237 struct iscsi_session *session;
2238 struct iscsi_conn *conn;
2239 struct iscsi_tm *hdr;
2240 int rc = FAILED;
2241
2242 cls_session = starget_to_session(scsi_target(sc->device));
2243 session = cls_session->dd_data;
2244
2245 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
2246
2247 mutex_lock(&session->eh_mutex);
2248 spin_lock_bh(&session->lock);
2249 /*
2250 * Just check if we are not logged in. We cannot check for
2251 * the phase because the reset could come from a ioctl.
2252 */
2253 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2254 goto unlock;
2255 conn = session->leadconn;
2256
2257 /* only have one tmf outstanding at a time */
2258 if (conn->tmf_state != TMF_INITIAL)
2259 goto unlock;
2260 conn->tmf_state = TMF_QUEUED;
2261
2262 hdr = &conn->tmhdr;
2263 iscsi_prep_lun_reset_pdu(sc, hdr);
2264
2265 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2266 session->lu_reset_timeout)) {
2267 rc = FAILED;
2268 goto unlock;
2269 }
2270
2271 switch (conn->tmf_state) {
2272 case TMF_SUCCESS:
2273 break;
2274 case TMF_TIMEDOUT:
2275 spin_unlock_bh(&session->lock);
2276 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2277 goto done;
2278 default:
2279 conn->tmf_state = TMF_INITIAL;
2280 goto unlock;
2281 }
2282
2283 rc = SUCCESS;
2284 spin_unlock_bh(&session->lock);
2285
2286 iscsi_suspend_tx(conn);
2287
2288 spin_lock_bh(&session->lock);
2289 memset(hdr, 0, sizeof(*hdr));
2290 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2291 conn->tmf_state = TMF_INITIAL;
2292 spin_unlock_bh(&session->lock);
2293
2294 iscsi_start_tx(conn);
2295 goto done;
2296
2297 unlock:
2298 spin_unlock_bh(&session->lock);
2299 done:
2300 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2301 rc == SUCCESS ? "SUCCESS" : "FAILED");
2302 mutex_unlock(&session->eh_mutex);
2303 return rc;
2304 }
2305 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2306
2307 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2308 {
2309 struct iscsi_session *session = cls_session->dd_data;
2310
2311 spin_lock_bh(&session->lock);
2312 if (session->state != ISCSI_STATE_LOGGED_IN) {
2313 session->state = ISCSI_STATE_RECOVERY_FAILED;
2314 if (session->leadconn)
2315 wake_up(&session->leadconn->ehwait);
2316 }
2317 spin_unlock_bh(&session->lock);
2318 }
2319 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2320
2321 /**
2322 * iscsi_eh_session_reset - drop session and attempt relogin
2323 * @sc: scsi command
2324 *
2325 * This function will wait for a relogin, session termination from
2326 * userspace, or a recovery/replacement timeout.
2327 */
2328 int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2329 {
2330 struct iscsi_cls_session *cls_session;
2331 struct iscsi_session *session;
2332 struct iscsi_conn *conn;
2333
2334 cls_session = starget_to_session(scsi_target(sc->device));
2335 session = cls_session->dd_data;
2336 conn = session->leadconn;
2337
2338 mutex_lock(&session->eh_mutex);
2339 spin_lock_bh(&session->lock);
2340 if (session->state == ISCSI_STATE_TERMINATE) {
2341 failed:
2342 ISCSI_DBG_EH(session,
2343 "failing session reset: Could not log back into "
2344 "%s, %s [age %d]\n", session->targetname,
2345 conn->persistent_address, session->age);
2346 spin_unlock_bh(&session->lock);
2347 mutex_unlock(&session->eh_mutex);
2348 return FAILED;
2349 }
2350
2351 spin_unlock_bh(&session->lock);
2352 mutex_unlock(&session->eh_mutex);
2353 /*
2354 * we drop the lock here but the leadconn cannot be destoyed while
2355 * we are in the scsi eh
2356 */
2357 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2358
2359 ISCSI_DBG_EH(session, "wait for relogin\n");
2360 wait_event_interruptible(conn->ehwait,
2361 session->state == ISCSI_STATE_TERMINATE ||
2362 session->state == ISCSI_STATE_LOGGED_IN ||
2363 session->state == ISCSI_STATE_RECOVERY_FAILED);
2364 if (signal_pending(current))
2365 flush_signals(current);
2366
2367 mutex_lock(&session->eh_mutex);
2368 spin_lock_bh(&session->lock);
2369 if (session->state == ISCSI_STATE_LOGGED_IN) {
2370 ISCSI_DBG_EH(session,
2371 "session reset succeeded for %s,%s\n",
2372 session->targetname, conn->persistent_address);
2373 } else
2374 goto failed;
2375 spin_unlock_bh(&session->lock);
2376 mutex_unlock(&session->eh_mutex);
2377 return SUCCESS;
2378 }
2379 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2380
2381 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2382 {
2383 memset(hdr, 0, sizeof(*hdr));
2384 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2385 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2386 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2387 hdr->rtt = RESERVED_ITT;
2388 }
2389
2390 /**
2391 * iscsi_eh_target_reset - reset target
2392 * @sc: scsi command
2393 *
2394 * This will attempt to send a warm target reset.
2395 */
2396 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2397 {
2398 struct iscsi_cls_session *cls_session;
2399 struct iscsi_session *session;
2400 struct iscsi_conn *conn;
2401 struct iscsi_tm *hdr;
2402 int rc = FAILED;
2403
2404 cls_session = starget_to_session(scsi_target(sc->device));
2405 session = cls_session->dd_data;
2406
2407 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2408 session->targetname);
2409
2410 mutex_lock(&session->eh_mutex);
2411 spin_lock_bh(&session->lock);
2412 /*
2413 * Just check if we are not logged in. We cannot check for
2414 * the phase because the reset could come from a ioctl.
2415 */
2416 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2417 goto unlock;
2418 conn = session->leadconn;
2419
2420 /* only have one tmf outstanding at a time */
2421 if (conn->tmf_state != TMF_INITIAL)
2422 goto unlock;
2423 conn->tmf_state = TMF_QUEUED;
2424
2425 hdr = &conn->tmhdr;
2426 iscsi_prep_tgt_reset_pdu(sc, hdr);
2427
2428 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2429 session->tgt_reset_timeout)) {
2430 rc = FAILED;
2431 goto unlock;
2432 }
2433
2434 switch (conn->tmf_state) {
2435 case TMF_SUCCESS:
2436 break;
2437 case TMF_TIMEDOUT:
2438 spin_unlock_bh(&session->lock);
2439 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2440 goto done;
2441 default:
2442 conn->tmf_state = TMF_INITIAL;
2443 goto unlock;
2444 }
2445
2446 rc = SUCCESS;
2447 spin_unlock_bh(&session->lock);
2448
2449 iscsi_suspend_tx(conn);
2450
2451 spin_lock_bh(&session->lock);
2452 memset(hdr, 0, sizeof(*hdr));
2453 fail_scsi_tasks(conn, -1, DID_ERROR);
2454 conn->tmf_state = TMF_INITIAL;
2455 spin_unlock_bh(&session->lock);
2456
2457 iscsi_start_tx(conn);
2458 goto done;
2459
2460 unlock:
2461 spin_unlock_bh(&session->lock);
2462 done:
2463 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2464 rc == SUCCESS ? "SUCCESS" : "FAILED");
2465 mutex_unlock(&session->eh_mutex);
2466 return rc;
2467 }
2468 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2469
2470 /**
2471 * iscsi_eh_recover_target - reset target and possibly the session
2472 * @sc: scsi command
2473 *
2474 * This will attempt to send a warm target reset. If that fails,
2475 * we will escalate to ERL0 session recovery.
2476 */
2477 int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2478 {
2479 int rc;
2480
2481 rc = iscsi_eh_target_reset(sc);
2482 if (rc == FAILED)
2483 rc = iscsi_eh_session_reset(sc);
2484 return rc;
2485 }
2486 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2487
2488 /*
2489 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2490 * should be accessed via kfifo_{get,put} on q->queue.
2491 * Optionally, the caller can obtain the array of object pointers
2492 * by passing in a non-NULL @items pointer
2493 */
2494 int
2495 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2496 {
2497 int i, num_arrays = 1;
2498
2499 memset(q, 0, sizeof(*q));
2500
2501 q->max = max;
2502
2503 /* If the user passed an items pointer, he wants a copy of
2504 * the array. */
2505 if (items)
2506 num_arrays++;
2507 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2508 if (q->pool == NULL)
2509 return -ENOMEM;
2510
2511 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2512
2513 for (i = 0; i < max; i++) {
2514 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2515 if (q->pool[i] == NULL) {
2516 q->max = i;
2517 goto enomem;
2518 }
2519 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2520 }
2521
2522 if (items) {
2523 *items = q->pool + max;
2524 memcpy(*items, q->pool, max * sizeof(void *));
2525 }
2526
2527 return 0;
2528
2529 enomem:
2530 iscsi_pool_free(q);
2531 return -ENOMEM;
2532 }
2533 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2534
2535 void iscsi_pool_free(struct iscsi_pool *q)
2536 {
2537 int i;
2538
2539 for (i = 0; i < q->max; i++)
2540 kfree(q->pool[i]);
2541 kfree(q->pool);
2542 }
2543 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2544
2545 /**
2546 * iscsi_host_add - add host to system
2547 * @shost: scsi host
2548 * @pdev: parent device
2549 *
2550 * This should be called by partial offload and software iscsi drivers
2551 * to add a host to the system.
2552 */
2553 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2554 {
2555 if (!shost->can_queue)
2556 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2557
2558 if (!shost->cmd_per_lun)
2559 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2560
2561 if (!shost->transportt->eh_timed_out)
2562 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2563 return scsi_add_host(shost, pdev);
2564 }
2565 EXPORT_SYMBOL_GPL(iscsi_host_add);
2566
2567 /**
2568 * iscsi_host_alloc - allocate a host and driver data
2569 * @sht: scsi host template
2570 * @dd_data_size: driver host data size
2571 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2572 *
2573 * This should be called by partial offload and software iscsi drivers.
2574 * To access the driver specific memory use the iscsi_host_priv() macro.
2575 */
2576 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2577 int dd_data_size, bool xmit_can_sleep)
2578 {
2579 struct Scsi_Host *shost;
2580 struct iscsi_host *ihost;
2581
2582 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2583 if (!shost)
2584 return NULL;
2585 ihost = shost_priv(shost);
2586
2587 if (xmit_can_sleep) {
2588 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2589 "iscsi_q_%d", shost->host_no);
2590 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2591 if (!ihost->workq)
2592 goto free_host;
2593 }
2594
2595 spin_lock_init(&ihost->lock);
2596 ihost->state = ISCSI_HOST_SETUP;
2597 ihost->num_sessions = 0;
2598 init_waitqueue_head(&ihost->session_removal_wq);
2599 return shost;
2600
2601 free_host:
2602 scsi_host_put(shost);
2603 return NULL;
2604 }
2605 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2606
2607 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2608 {
2609 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2610 }
2611
2612 /**
2613 * iscsi_host_remove - remove host and sessions
2614 * @shost: scsi host
2615 *
2616 * If there are any sessions left, this will initiate the removal and wait
2617 * for the completion.
2618 */
2619 void iscsi_host_remove(struct Scsi_Host *shost)
2620 {
2621 struct iscsi_host *ihost = shost_priv(shost);
2622 unsigned long flags;
2623
2624 spin_lock_irqsave(&ihost->lock, flags);
2625 ihost->state = ISCSI_HOST_REMOVED;
2626 spin_unlock_irqrestore(&ihost->lock, flags);
2627
2628 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2629 wait_event_interruptible(ihost->session_removal_wq,
2630 ihost->num_sessions == 0);
2631 if (signal_pending(current))
2632 flush_signals(current);
2633
2634 scsi_remove_host(shost);
2635 if (ihost->workq)
2636 destroy_workqueue(ihost->workq);
2637 }
2638 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2639
2640 void iscsi_host_free(struct Scsi_Host *shost)
2641 {
2642 struct iscsi_host *ihost = shost_priv(shost);
2643
2644 kfree(ihost->netdev);
2645 kfree(ihost->hwaddress);
2646 kfree(ihost->initiatorname);
2647 scsi_host_put(shost);
2648 }
2649 EXPORT_SYMBOL_GPL(iscsi_host_free);
2650
2651 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2652 {
2653 struct iscsi_host *ihost = shost_priv(shost);
2654 unsigned long flags;
2655
2656 shost = scsi_host_get(shost);
2657 if (!shost) {
2658 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2659 "of session teardown event because host already "
2660 "removed.\n");
2661 return;
2662 }
2663
2664 spin_lock_irqsave(&ihost->lock, flags);
2665 ihost->num_sessions--;
2666 if (ihost->num_sessions == 0)
2667 wake_up(&ihost->session_removal_wq);
2668 spin_unlock_irqrestore(&ihost->lock, flags);
2669 scsi_host_put(shost);
2670 }
2671
2672 /**
2673 * iscsi_session_setup - create iscsi cls session and host and session
2674 * @iscsit: iscsi transport template
2675 * @shost: scsi host
2676 * @cmds_max: session can queue
2677 * @cmd_task_size: LLD task private data size
2678 * @initial_cmdsn: initial CmdSN
2679 *
2680 * This can be used by software iscsi_transports that allocate
2681 * a session per scsi host.
2682 *
2683 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2684 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2685 * for nop handling and login/logout requests.
2686 */
2687 struct iscsi_cls_session *
2688 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2689 uint16_t cmds_max, int dd_size, int cmd_task_size,
2690 uint32_t initial_cmdsn, unsigned int id)
2691 {
2692 struct iscsi_host *ihost = shost_priv(shost);
2693 struct iscsi_session *session;
2694 struct iscsi_cls_session *cls_session;
2695 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2696 unsigned long flags;
2697
2698 spin_lock_irqsave(&ihost->lock, flags);
2699 if (ihost->state == ISCSI_HOST_REMOVED) {
2700 spin_unlock_irqrestore(&ihost->lock, flags);
2701 return NULL;
2702 }
2703 ihost->num_sessions++;
2704 spin_unlock_irqrestore(&ihost->lock, flags);
2705
2706 if (!total_cmds)
2707 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2708 /*
2709 * The iscsi layer needs some tasks for nop handling and tmfs,
2710 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2711 * + 1 command for scsi IO.
2712 */
2713 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2714 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2715 "must be a power of two that is at least %d.\n",
2716 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2717 goto dec_session_count;
2718 }
2719
2720 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2721 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2722 "must be a power of 2 less than or equal to %d.\n",
2723 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2724 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2725 }
2726
2727 if (!is_power_of_2(total_cmds)) {
2728 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2729 "must be a power of 2.\n", total_cmds);
2730 total_cmds = rounddown_pow_of_two(total_cmds);
2731 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2732 return NULL;
2733 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2734 total_cmds);
2735 }
2736 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2737
2738 cls_session = iscsi_alloc_session(shost, iscsit,
2739 sizeof(struct iscsi_session) +
2740 dd_size);
2741 if (!cls_session)
2742 goto dec_session_count;
2743 session = cls_session->dd_data;
2744 session->cls_session = cls_session;
2745 session->host = shost;
2746 session->state = ISCSI_STATE_FREE;
2747 session->fast_abort = 1;
2748 session->tgt_reset_timeout = 30;
2749 session->lu_reset_timeout = 15;
2750 session->abort_timeout = 10;
2751 session->scsi_cmds_max = scsi_cmds;
2752 session->cmds_max = total_cmds;
2753 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2754 session->exp_cmdsn = initial_cmdsn + 1;
2755 session->max_cmdsn = initial_cmdsn + 1;
2756 session->max_r2t = 1;
2757 session->tt = iscsit;
2758 session->dd_data = cls_session->dd_data + sizeof(*session);
2759 mutex_init(&session->eh_mutex);
2760 spin_lock_init(&session->lock);
2761
2762 /* initialize SCSI PDU commands pool */
2763 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2764 (void***)&session->cmds,
2765 cmd_task_size + sizeof(struct iscsi_task)))
2766 goto cmdpool_alloc_fail;
2767
2768 /* pre-format cmds pool with ITT */
2769 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2770 struct iscsi_task *task = session->cmds[cmd_i];
2771
2772 if (cmd_task_size)
2773 task->dd_data = &task[1];
2774 task->itt = cmd_i;
2775 task->state = ISCSI_TASK_FREE;
2776 INIT_LIST_HEAD(&task->running);
2777 }
2778
2779 if (!try_module_get(iscsit->owner))
2780 goto module_get_fail;
2781
2782 if (iscsi_add_session(cls_session, id))
2783 goto cls_session_fail;
2784
2785 return cls_session;
2786
2787 cls_session_fail:
2788 module_put(iscsit->owner);
2789 module_get_fail:
2790 iscsi_pool_free(&session->cmdpool);
2791 cmdpool_alloc_fail:
2792 iscsi_free_session(cls_session);
2793 dec_session_count:
2794 iscsi_host_dec_session_cnt(shost);
2795 return NULL;
2796 }
2797 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2798
2799 /**
2800 * iscsi_session_teardown - destroy session, host, and cls_session
2801 * @cls_session: iscsi session
2802 *
2803 * The driver must have called iscsi_remove_session before
2804 * calling this.
2805 */
2806 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2807 {
2808 struct iscsi_session *session = cls_session->dd_data;
2809 struct module *owner = cls_session->transport->owner;
2810 struct Scsi_Host *shost = session->host;
2811
2812 iscsi_pool_free(&session->cmdpool);
2813
2814 kfree(session->password);
2815 kfree(session->password_in);
2816 kfree(session->username);
2817 kfree(session->username_in);
2818 kfree(session->targetname);
2819 kfree(session->targetalias);
2820 kfree(session->initiatorname);
2821 kfree(session->ifacename);
2822
2823 iscsi_destroy_session(cls_session);
2824 iscsi_host_dec_session_cnt(shost);
2825 module_put(owner);
2826 }
2827 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2828
2829 /**
2830 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2831 * @cls_session: iscsi_cls_session
2832 * @dd_size: private driver data size
2833 * @conn_idx: cid
2834 */
2835 struct iscsi_cls_conn *
2836 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2837 uint32_t conn_idx)
2838 {
2839 struct iscsi_session *session = cls_session->dd_data;
2840 struct iscsi_conn *conn;
2841 struct iscsi_cls_conn *cls_conn;
2842 char *data;
2843
2844 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2845 conn_idx);
2846 if (!cls_conn)
2847 return NULL;
2848 conn = cls_conn->dd_data;
2849 memset(conn, 0, sizeof(*conn) + dd_size);
2850
2851 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2852 conn->session = session;
2853 conn->cls_conn = cls_conn;
2854 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2855 conn->id = conn_idx;
2856 conn->exp_statsn = 0;
2857 conn->tmf_state = TMF_INITIAL;
2858
2859 init_timer(&conn->transport_timer);
2860 conn->transport_timer.data = (unsigned long)conn;
2861 conn->transport_timer.function = iscsi_check_transport_timeouts;
2862
2863 INIT_LIST_HEAD(&conn->mgmtqueue);
2864 INIT_LIST_HEAD(&conn->cmdqueue);
2865 INIT_LIST_HEAD(&conn->requeue);
2866 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2867
2868 /* allocate login_task used for the login/text sequences */
2869 spin_lock_bh(&session->lock);
2870 if (!kfifo_out(&session->cmdpool.queue,
2871 (void*)&conn->login_task,
2872 sizeof(void*))) {
2873 spin_unlock_bh(&session->lock);
2874 goto login_task_alloc_fail;
2875 }
2876 spin_unlock_bh(&session->lock);
2877
2878 data = (char *) __get_free_pages(GFP_KERNEL,
2879 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2880 if (!data)
2881 goto login_task_data_alloc_fail;
2882 conn->login_task->data = conn->data = data;
2883
2884 init_timer(&conn->tmf_timer);
2885 init_waitqueue_head(&conn->ehwait);
2886
2887 return cls_conn;
2888
2889 login_task_data_alloc_fail:
2890 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2891 sizeof(void*));
2892 login_task_alloc_fail:
2893 iscsi_destroy_conn(cls_conn);
2894 return NULL;
2895 }
2896 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2897
2898 /**
2899 * iscsi_conn_teardown - teardown iscsi connection
2900 * cls_conn: iscsi class connection
2901 *
2902 * TODO: we may need to make this into a two step process
2903 * like scsi-mls remove + put host
2904 */
2905 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2906 {
2907 struct iscsi_conn *conn = cls_conn->dd_data;
2908 struct iscsi_session *session = conn->session;
2909 unsigned long flags;
2910
2911 del_timer_sync(&conn->transport_timer);
2912
2913 spin_lock_bh(&session->lock);
2914 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2915 if (session->leadconn == conn) {
2916 /*
2917 * leading connection? then give up on recovery.
2918 */
2919 session->state = ISCSI_STATE_TERMINATE;
2920 wake_up(&conn->ehwait);
2921 }
2922 spin_unlock_bh(&session->lock);
2923
2924 /*
2925 * Block until all in-progress commands for this connection
2926 * time out or fail.
2927 */
2928 for (;;) {
2929 spin_lock_irqsave(session->host->host_lock, flags);
2930 if (!session->host->host_busy) { /* OK for ERL == 0 */
2931 spin_unlock_irqrestore(session->host->host_lock, flags);
2932 break;
2933 }
2934 spin_unlock_irqrestore(session->host->host_lock, flags);
2935 msleep_interruptible(500);
2936 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2937 "host_busy %d host_failed %d\n",
2938 session->host->host_busy,
2939 session->host->host_failed);
2940 /*
2941 * force eh_abort() to unblock
2942 */
2943 wake_up(&conn->ehwait);
2944 }
2945
2946 /* flush queued up work because we free the connection below */
2947 iscsi_suspend_tx(conn);
2948
2949 spin_lock_bh(&session->lock);
2950 free_pages((unsigned long) conn->data,
2951 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2952 kfree(conn->persistent_address);
2953 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2954 sizeof(void*));
2955 if (session->leadconn == conn)
2956 session->leadconn = NULL;
2957 spin_unlock_bh(&session->lock);
2958
2959 iscsi_destroy_conn(cls_conn);
2960 }
2961 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2962
2963 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2964 {
2965 struct iscsi_conn *conn = cls_conn->dd_data;
2966 struct iscsi_session *session = conn->session;
2967
2968 if (!session) {
2969 iscsi_conn_printk(KERN_ERR, conn,
2970 "can't start unbound connection\n");
2971 return -EPERM;
2972 }
2973
2974 if ((session->imm_data_en || !session->initial_r2t_en) &&
2975 session->first_burst > session->max_burst) {
2976 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2977 "first_burst %d max_burst %d\n",
2978 session->first_burst, session->max_burst);
2979 return -EINVAL;
2980 }
2981
2982 if (conn->ping_timeout && !conn->recv_timeout) {
2983 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2984 "zero. Using 5 seconds\n.");
2985 conn->recv_timeout = 5;
2986 }
2987
2988 if (conn->recv_timeout && !conn->ping_timeout) {
2989 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2990 "zero. Using 5 seconds.\n");
2991 conn->ping_timeout = 5;
2992 }
2993
2994 spin_lock_bh(&session->lock);
2995 conn->c_stage = ISCSI_CONN_STARTED;
2996 session->state = ISCSI_STATE_LOGGED_IN;
2997 session->queued_cmdsn = session->cmdsn;
2998
2999 conn->last_recv = jiffies;
3000 conn->last_ping = jiffies;
3001 if (conn->recv_timeout && conn->ping_timeout)
3002 mod_timer(&conn->transport_timer,
3003 jiffies + (conn->recv_timeout * HZ));
3004
3005 switch(conn->stop_stage) {
3006 case STOP_CONN_RECOVER:
3007 /*
3008 * unblock eh_abort() if it is blocked. re-try all
3009 * commands after successful recovery
3010 */
3011 conn->stop_stage = 0;
3012 conn->tmf_state = TMF_INITIAL;
3013 session->age++;
3014 if (session->age == 16)
3015 session->age = 0;
3016 break;
3017 case STOP_CONN_TERM:
3018 conn->stop_stage = 0;
3019 break;
3020 default:
3021 break;
3022 }
3023 spin_unlock_bh(&session->lock);
3024
3025 iscsi_unblock_session(session->cls_session);
3026 wake_up(&conn->ehwait);
3027 return 0;
3028 }
3029 EXPORT_SYMBOL_GPL(iscsi_conn_start);
3030
3031 static void
3032 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3033 {
3034 struct iscsi_task *task;
3035 int i, state;
3036
3037 for (i = 0; i < conn->session->cmds_max; i++) {
3038 task = conn->session->cmds[i];
3039 if (task->sc)
3040 continue;
3041
3042 if (task->state == ISCSI_TASK_FREE)
3043 continue;
3044
3045 ISCSI_DBG_SESSION(conn->session,
3046 "failing mgmt itt 0x%x state %d\n",
3047 task->itt, task->state);
3048 state = ISCSI_TASK_ABRT_SESS_RECOV;
3049 if (task->state == ISCSI_TASK_PENDING)
3050 state = ISCSI_TASK_COMPLETED;
3051 iscsi_complete_task(task, state);
3052
3053 }
3054 }
3055
3056 static void iscsi_start_session_recovery(struct iscsi_session *session,
3057 struct iscsi_conn *conn, int flag)
3058 {
3059 int old_stop_stage;
3060
3061 mutex_lock(&session->eh_mutex);
3062 spin_lock_bh(&session->lock);
3063 if (conn->stop_stage == STOP_CONN_TERM) {
3064 spin_unlock_bh(&session->lock);
3065 mutex_unlock(&session->eh_mutex);
3066 return;
3067 }
3068
3069 /*
3070 * When this is called for the in_login state, we only want to clean
3071 * up the login task and connection. We do not need to block and set
3072 * the recovery state again
3073 */
3074 if (flag == STOP_CONN_TERM)
3075 session->state = ISCSI_STATE_TERMINATE;
3076 else if (conn->stop_stage != STOP_CONN_RECOVER)
3077 session->state = ISCSI_STATE_IN_RECOVERY;
3078
3079 old_stop_stage = conn->stop_stage;
3080 conn->stop_stage = flag;
3081 spin_unlock_bh(&session->lock);
3082
3083 del_timer_sync(&conn->transport_timer);
3084 iscsi_suspend_tx(conn);
3085
3086 spin_lock_bh(&session->lock);
3087 conn->c_stage = ISCSI_CONN_STOPPED;
3088 spin_unlock_bh(&session->lock);
3089
3090 /*
3091 * for connection level recovery we should not calculate
3092 * header digest. conn->hdr_size used for optimization
3093 * in hdr_extract() and will be re-negotiated at
3094 * set_param() time.
3095 */
3096 if (flag == STOP_CONN_RECOVER) {
3097 conn->hdrdgst_en = 0;
3098 conn->datadgst_en = 0;
3099 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3100 old_stop_stage != STOP_CONN_RECOVER) {
3101 ISCSI_DBG_SESSION(session, "blocking session\n");
3102 iscsi_block_session(session->cls_session);
3103 }
3104 }
3105
3106 /*
3107 * flush queues.
3108 */
3109 spin_lock_bh(&session->lock);
3110 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3111 fail_mgmt_tasks(session, conn);
3112 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3113 spin_unlock_bh(&session->lock);
3114 mutex_unlock(&session->eh_mutex);
3115 }
3116
3117 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3118 {
3119 struct iscsi_conn *conn = cls_conn->dd_data;
3120 struct iscsi_session *session = conn->session;
3121
3122 switch (flag) {
3123 case STOP_CONN_RECOVER:
3124 case STOP_CONN_TERM:
3125 iscsi_start_session_recovery(session, conn, flag);
3126 break;
3127 default:
3128 iscsi_conn_printk(KERN_ERR, conn,
3129 "invalid stop flag %d\n", flag);
3130 }
3131 }
3132 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3133
3134 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3135 struct iscsi_cls_conn *cls_conn, int is_leading)
3136 {
3137 struct iscsi_session *session = cls_session->dd_data;
3138 struct iscsi_conn *conn = cls_conn->dd_data;
3139
3140 spin_lock_bh(&session->lock);
3141 if (is_leading)
3142 session->leadconn = conn;
3143 spin_unlock_bh(&session->lock);
3144
3145 /*
3146 * Unblock xmitworker(), Login Phase will pass through.
3147 */
3148 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3149 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3150 return 0;
3151 }
3152 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3153
3154 int iscsi_switch_str_param(char **param, char *new_val_buf)
3155 {
3156 char *new_val;
3157
3158 if (*param) {
3159 if (!strcmp(*param, new_val_buf))
3160 return 0;
3161 }
3162
3163 new_val = kstrdup(new_val_buf, GFP_NOIO);
3164 if (!new_val)
3165 return -ENOMEM;
3166
3167 kfree(*param);
3168 *param = new_val;
3169 return 0;
3170 }
3171 EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3172
3173 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3174 enum iscsi_param param, char *buf, int buflen)
3175 {
3176 struct iscsi_conn *conn = cls_conn->dd_data;
3177 struct iscsi_session *session = conn->session;
3178
3179 switch(param) {
3180 case ISCSI_PARAM_FAST_ABORT:
3181 sscanf(buf, "%d", &session->fast_abort);
3182 break;
3183 case ISCSI_PARAM_ABORT_TMO:
3184 sscanf(buf, "%d", &session->abort_timeout);
3185 break;
3186 case ISCSI_PARAM_LU_RESET_TMO:
3187 sscanf(buf, "%d", &session->lu_reset_timeout);
3188 break;
3189 case ISCSI_PARAM_TGT_RESET_TMO:
3190 sscanf(buf, "%d", &session->tgt_reset_timeout);
3191 break;
3192 case ISCSI_PARAM_PING_TMO:
3193 sscanf(buf, "%d", &conn->ping_timeout);
3194 break;
3195 case ISCSI_PARAM_RECV_TMO:
3196 sscanf(buf, "%d", &conn->recv_timeout);
3197 break;
3198 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3199 sscanf(buf, "%d", &conn->max_recv_dlength);
3200 break;
3201 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3202 sscanf(buf, "%d", &conn->max_xmit_dlength);
3203 break;
3204 case ISCSI_PARAM_HDRDGST_EN:
3205 sscanf(buf, "%d", &conn->hdrdgst_en);
3206 break;
3207 case ISCSI_PARAM_DATADGST_EN:
3208 sscanf(buf, "%d", &conn->datadgst_en);
3209 break;
3210 case ISCSI_PARAM_INITIAL_R2T_EN:
3211 sscanf(buf, "%d", &session->initial_r2t_en);
3212 break;
3213 case ISCSI_PARAM_MAX_R2T:
3214 sscanf(buf, "%hu", &session->max_r2t);
3215 break;
3216 case ISCSI_PARAM_IMM_DATA_EN:
3217 sscanf(buf, "%d", &session->imm_data_en);
3218 break;
3219 case ISCSI_PARAM_FIRST_BURST:
3220 sscanf(buf, "%d", &session->first_burst);
3221 break;
3222 case ISCSI_PARAM_MAX_BURST:
3223 sscanf(buf, "%d", &session->max_burst);
3224 break;
3225 case ISCSI_PARAM_PDU_INORDER_EN:
3226 sscanf(buf, "%d", &session->pdu_inorder_en);
3227 break;
3228 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3229 sscanf(buf, "%d", &session->dataseq_inorder_en);
3230 break;
3231 case ISCSI_PARAM_ERL:
3232 sscanf(buf, "%d", &session->erl);
3233 break;
3234 case ISCSI_PARAM_EXP_STATSN:
3235 sscanf(buf, "%u", &conn->exp_statsn);
3236 break;
3237 case ISCSI_PARAM_USERNAME:
3238 return iscsi_switch_str_param(&session->username, buf);
3239 case ISCSI_PARAM_USERNAME_IN:
3240 return iscsi_switch_str_param(&session->username_in, buf);
3241 case ISCSI_PARAM_PASSWORD:
3242 return iscsi_switch_str_param(&session->password, buf);
3243 case ISCSI_PARAM_PASSWORD_IN:
3244 return iscsi_switch_str_param(&session->password_in, buf);
3245 case ISCSI_PARAM_TARGET_NAME:
3246 return iscsi_switch_str_param(&session->targetname, buf);
3247 case ISCSI_PARAM_TARGET_ALIAS:
3248 return iscsi_switch_str_param(&session->targetalias, buf);
3249 case ISCSI_PARAM_TPGT:
3250 sscanf(buf, "%d", &session->tpgt);
3251 break;
3252 case ISCSI_PARAM_PERSISTENT_PORT:
3253 sscanf(buf, "%d", &conn->persistent_port);
3254 break;
3255 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3256 return iscsi_switch_str_param(&conn->persistent_address, buf);
3257 case ISCSI_PARAM_IFACE_NAME:
3258 return iscsi_switch_str_param(&session->ifacename, buf);
3259 case ISCSI_PARAM_INITIATOR_NAME:
3260 return iscsi_switch_str_param(&session->initiatorname, buf);
3261 default:
3262 return -ENOSYS;
3263 }
3264
3265 return 0;
3266 }
3267 EXPORT_SYMBOL_GPL(iscsi_set_param);
3268
3269 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3270 enum iscsi_param param, char *buf)
3271 {
3272 struct iscsi_session *session = cls_session->dd_data;
3273 int len;
3274
3275 switch(param) {
3276 case ISCSI_PARAM_FAST_ABORT:
3277 len = sprintf(buf, "%d\n", session->fast_abort);
3278 break;
3279 case ISCSI_PARAM_ABORT_TMO:
3280 len = sprintf(buf, "%d\n", session->abort_timeout);
3281 break;
3282 case ISCSI_PARAM_LU_RESET_TMO:
3283 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3284 break;
3285 case ISCSI_PARAM_TGT_RESET_TMO:
3286 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3287 break;
3288 case ISCSI_PARAM_INITIAL_R2T_EN:
3289 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3290 break;
3291 case ISCSI_PARAM_MAX_R2T:
3292 len = sprintf(buf, "%hu\n", session->max_r2t);
3293 break;
3294 case ISCSI_PARAM_IMM_DATA_EN:
3295 len = sprintf(buf, "%d\n", session->imm_data_en);
3296 break;
3297 case ISCSI_PARAM_FIRST_BURST:
3298 len = sprintf(buf, "%u\n", session->first_burst);
3299 break;
3300 case ISCSI_PARAM_MAX_BURST:
3301 len = sprintf(buf, "%u\n", session->max_burst);
3302 break;
3303 case ISCSI_PARAM_PDU_INORDER_EN:
3304 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3305 break;
3306 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3307 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3308 break;
3309 case ISCSI_PARAM_ERL:
3310 len = sprintf(buf, "%d\n", session->erl);
3311 break;
3312 case ISCSI_PARAM_TARGET_NAME:
3313 len = sprintf(buf, "%s\n", session->targetname);
3314 break;
3315 case ISCSI_PARAM_TARGET_ALIAS:
3316 len = sprintf(buf, "%s\n", session->targetalias);
3317 break;
3318 case ISCSI_PARAM_TPGT:
3319 len = sprintf(buf, "%d\n", session->tpgt);
3320 break;
3321 case ISCSI_PARAM_USERNAME:
3322 len = sprintf(buf, "%s\n", session->username);
3323 break;
3324 case ISCSI_PARAM_USERNAME_IN:
3325 len = sprintf(buf, "%s\n", session->username_in);
3326 break;
3327 case ISCSI_PARAM_PASSWORD:
3328 len = sprintf(buf, "%s\n", session->password);
3329 break;
3330 case ISCSI_PARAM_PASSWORD_IN:
3331 len = sprintf(buf, "%s\n", session->password_in);
3332 break;
3333 case ISCSI_PARAM_IFACE_NAME:
3334 len = sprintf(buf, "%s\n", session->ifacename);
3335 break;
3336 case ISCSI_PARAM_INITIATOR_NAME:
3337 len = sprintf(buf, "%s\n", session->initiatorname);
3338 break;
3339 default:
3340 return -ENOSYS;
3341 }
3342
3343 return len;
3344 }
3345 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3346
3347 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3348 enum iscsi_param param, char *buf)
3349 {
3350 struct sockaddr_in6 *sin6 = NULL;
3351 struct sockaddr_in *sin = NULL;
3352 int len;
3353
3354 switch (addr->ss_family) {
3355 case AF_INET:
3356 sin = (struct sockaddr_in *)addr;
3357 break;
3358 case AF_INET6:
3359 sin6 = (struct sockaddr_in6 *)addr;
3360 break;
3361 default:
3362 return -EINVAL;
3363 }
3364
3365 switch (param) {
3366 case ISCSI_PARAM_CONN_ADDRESS:
3367 case ISCSI_HOST_PARAM_IPADDRESS:
3368 if (sin)
3369 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3370 else
3371 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3372 break;
3373 case ISCSI_PARAM_CONN_PORT:
3374 if (sin)
3375 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3376 else
3377 len = sprintf(buf, "%hu\n",
3378 be16_to_cpu(sin6->sin6_port));
3379 break;
3380 default:
3381 return -EINVAL;
3382 }
3383
3384 return len;
3385 }
3386 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3387
3388 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3389 enum iscsi_param param, char *buf)
3390 {
3391 struct iscsi_conn *conn = cls_conn->dd_data;
3392 int len;
3393
3394 switch(param) {
3395 case ISCSI_PARAM_PING_TMO:
3396 len = sprintf(buf, "%u\n", conn->ping_timeout);
3397 break;
3398 case ISCSI_PARAM_RECV_TMO:
3399 len = sprintf(buf, "%u\n", conn->recv_timeout);
3400 break;
3401 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3402 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3403 break;
3404 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3405 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3406 break;
3407 case ISCSI_PARAM_HDRDGST_EN:
3408 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3409 break;
3410 case ISCSI_PARAM_DATADGST_EN:
3411 len = sprintf(buf, "%d\n", conn->datadgst_en);
3412 break;
3413 case ISCSI_PARAM_IFMARKER_EN:
3414 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3415 break;
3416 case ISCSI_PARAM_OFMARKER_EN:
3417 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3418 break;
3419 case ISCSI_PARAM_EXP_STATSN:
3420 len = sprintf(buf, "%u\n", conn->exp_statsn);
3421 break;
3422 case ISCSI_PARAM_PERSISTENT_PORT:
3423 len = sprintf(buf, "%d\n", conn->persistent_port);
3424 break;
3425 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3426 len = sprintf(buf, "%s\n", conn->persistent_address);
3427 break;
3428 default:
3429 return -ENOSYS;
3430 }
3431
3432 return len;
3433 }
3434 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3435
3436 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3437 char *buf)
3438 {
3439 struct iscsi_host *ihost = shost_priv(shost);
3440 int len;
3441
3442 switch (param) {
3443 case ISCSI_HOST_PARAM_NETDEV_NAME:
3444 len = sprintf(buf, "%s\n", ihost->netdev);
3445 break;
3446 case ISCSI_HOST_PARAM_HWADDRESS:
3447 len = sprintf(buf, "%s\n", ihost->hwaddress);
3448 break;
3449 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3450 len = sprintf(buf, "%s\n", ihost->initiatorname);
3451 break;
3452 default:
3453 return -ENOSYS;
3454 }
3455
3456 return len;
3457 }
3458 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3459
3460 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3461 char *buf, int buflen)
3462 {
3463 struct iscsi_host *ihost = shost_priv(shost);
3464
3465 switch (param) {
3466 case ISCSI_HOST_PARAM_NETDEV_NAME:
3467 return iscsi_switch_str_param(&ihost->netdev, buf);
3468 case ISCSI_HOST_PARAM_HWADDRESS:
3469 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3470 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3471 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3472 default:
3473 return -ENOSYS;
3474 }
3475
3476 return 0;
3477 }
3478 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3479
3480 MODULE_AUTHOR("Mike Christie");
3481 MODULE_DESCRIPTION("iSCSI library functions");
3482 MODULE_LICENSE("GPL");
Linux with added FPC-III support