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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/sched/signal.h>
30#include <linux/module.h>
31#include <asm/unaligned.h>
32#include <net/tcp.h>
33#include <scsi/scsi_cmnd.h>
34#include <scsi/scsi_device.h>
35#include <scsi/scsi_eh.h>
36#include <scsi/scsi_tcq.h>
37#include <scsi/scsi_host.h>
38#include <scsi/scsi.h>
39#include <scsi/iscsi_proto.h>
40#include <scsi/scsi_transport.h>
41#include <scsi/scsi_transport_iscsi.h>
42#include <scsi/libiscsi.h>
43
44static int iscsi_dbg_lib_conn;
45module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
46 S_IRUGO | S_IWUSR);
47MODULE_PARM_DESC(debug_libiscsi_conn,
48 "Turn on debugging for connections in libiscsi module. "
49 "Set to 1 to turn on, and zero to turn off. Default is off.");
50
51static int iscsi_dbg_lib_session;
52module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
53 S_IRUGO | S_IWUSR);
54MODULE_PARM_DESC(debug_libiscsi_session,
55 "Turn on debugging for sessions in libiscsi module. "
56 "Set to 1 to turn on, and zero to turn off. Default is off.");
57
58static int iscsi_dbg_lib_eh;
59module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
60 S_IRUGO | S_IWUSR);
61MODULE_PARM_DESC(debug_libiscsi_eh,
62 "Turn on debugging for error handling in libiscsi module. "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
64
65#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
66 do { \
67 if (iscsi_dbg_lib_conn) \
68 iscsi_conn_printk(KERN_INFO, _conn, \
69 "%s " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
74 do { \
75 if (iscsi_dbg_lib_session) \
76 iscsi_session_printk(KERN_INFO, _session, \
77 "%s " dbg_fmt, \
78 __func__, ##arg); \
79 } while (0);
80
81#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
82 do { \
83 if (iscsi_dbg_lib_eh) \
84 iscsi_session_printk(KERN_INFO, _session, \
85 "%s " dbg_fmt, \
86 __func__, ##arg); \
87 } while (0);
88
89inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
90{
91 struct Scsi_Host *shost = conn->session->host;
92 struct iscsi_host *ihost = shost_priv(shost);
93
94 if (ihost->workq)
95 queue_work(ihost->workq, &conn->xmitwork);
96}
97EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
98
99static void __iscsi_update_cmdsn(struct iscsi_session *session,
100 uint32_t exp_cmdsn, uint32_t max_cmdsn)
101{
102 /*
103 * standard specifies this check for when to update expected and
104 * max sequence numbers
105 */
106 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
107 return;
108
109 if (exp_cmdsn != session->exp_cmdsn &&
110 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
111 session->exp_cmdsn = exp_cmdsn;
112
113 if (max_cmdsn != session->max_cmdsn &&
114 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
115 session->max_cmdsn = max_cmdsn;
116}
117
118void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
119{
120 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
121 be32_to_cpu(hdr->max_cmdsn));
122}
123EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
124
125/**
126 * iscsi_prep_data_out_pdu - initialize Data-Out
127 * @task: scsi command task
128 * @r2t: R2T info
129 * @hdr: iscsi data in pdu
130 *
131 * Notes:
132 * Initialize Data-Out within this R2T sequence and finds
133 * proper data_offset within this SCSI command.
134 *
135 * This function is called with connection lock taken.
136 **/
137void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
138 struct iscsi_data *hdr)
139{
140 struct iscsi_conn *conn = task->conn;
141 unsigned int left = r2t->data_length - r2t->sent;
142
143 task->hdr_len = sizeof(struct iscsi_data);
144
145 memset(hdr, 0, sizeof(struct iscsi_data));
146 hdr->ttt = r2t->ttt;
147 hdr->datasn = cpu_to_be32(r2t->datasn);
148 r2t->datasn++;
149 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
150 hdr->lun = task->lun;
151 hdr->itt = task->hdr_itt;
152 hdr->exp_statsn = r2t->exp_statsn;
153 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
154 if (left > conn->max_xmit_dlength) {
155 hton24(hdr->dlength, conn->max_xmit_dlength);
156 r2t->data_count = conn->max_xmit_dlength;
157 hdr->flags = 0;
158 } else {
159 hton24(hdr->dlength, left);
160 r2t->data_count = left;
161 hdr->flags = ISCSI_FLAG_CMD_FINAL;
162 }
163 conn->dataout_pdus_cnt++;
164}
165EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
166
167static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
168{
169 unsigned exp_len = task->hdr_len + len;
170
171 if (exp_len > task->hdr_max) {
172 WARN_ON(1);
173 return -EINVAL;
174 }
175
176 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
177 task->hdr_len = exp_len;
178 return 0;
179}
180
181/*
182 * make an extended cdb AHS
183 */
184static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
185{
186 struct scsi_cmnd *cmd = task->sc;
187 unsigned rlen, pad_len;
188 unsigned short ahslength;
189 struct iscsi_ecdb_ahdr *ecdb_ahdr;
190 int rc;
191
192 ecdb_ahdr = iscsi_next_hdr(task);
193 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
194
195 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
196 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
197
198 pad_len = iscsi_padding(rlen);
199
200 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
201 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
202 if (rc)
203 return rc;
204
205 if (pad_len)
206 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
207
208 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
209 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
210 ecdb_ahdr->reserved = 0;
211 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
212
213 ISCSI_DBG_SESSION(task->conn->session,
214 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
215 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
216 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
217 task->hdr_len);
218 return 0;
219}
220
221static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
222{
223 struct scsi_cmnd *sc = task->sc;
224 struct iscsi_rlength_ahdr *rlen_ahdr;
225 int rc;
226
227 rlen_ahdr = iscsi_next_hdr(task);
228 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
229 if (rc)
230 return rc;
231
232 rlen_ahdr->ahslength =
233 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
234 sizeof(rlen_ahdr->reserved));
235 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
236 rlen_ahdr->reserved = 0;
237 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
238
239 ISCSI_DBG_SESSION(task->conn->session,
240 "bidi-in rlen_ahdr->read_length(%d) "
241 "rlen_ahdr->ahslength(%d)\n",
242 be32_to_cpu(rlen_ahdr->read_length),
243 be16_to_cpu(rlen_ahdr->ahslength));
244 return 0;
245}
246
247/**
248 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
249 * @task: iscsi task
250 * @opcode: opcode to check for
251 *
252 * During TMF a task has to be checked if it's affected.
253 * All unrelated I/O can be passed through, but I/O to the
254 * affected LUN should be restricted.
255 * If 'fast_abort' is set we won't be sending any I/O to the
256 * affected LUN.
257 * Otherwise the target is waiting for all TTTs to be completed,
258 * so we have to send all outstanding Data-Out PDUs to the target.
259 */
260static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
261{
262 struct iscsi_conn *conn = task->conn;
263 struct iscsi_tm *tmf = &conn->tmhdr;
264 u64 hdr_lun;
265
266 if (conn->tmf_state == TMF_INITIAL)
267 return 0;
268
269 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
270 return 0;
271
272 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
273 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
274 /*
275 * Allow PDUs for unrelated LUNs
276 */
277 hdr_lun = scsilun_to_int(&tmf->lun);
278 if (hdr_lun != task->sc->device->lun)
279 return 0;
280 /* fall through */
281 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
282 /*
283 * Fail all SCSI cmd PDUs
284 */
285 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
286 iscsi_conn_printk(KERN_INFO, conn,
287 "task [op %x/%x itt "
288 "0x%x/0x%x] "
289 "rejected.\n",
290 task->hdr->opcode, opcode,
291 task->itt, task->hdr_itt);
292 return -EACCES;
293 }
294 /*
295 * And also all data-out PDUs in response to R2T
296 * if fast_abort is set.
297 */
298 if (conn->session->fast_abort) {
299 iscsi_conn_printk(KERN_INFO, conn,
300 "task [op %x/%x itt "
301 "0x%x/0x%x] fast abort.\n",
302 task->hdr->opcode, opcode,
303 task->itt, task->hdr_itt);
304 return -EACCES;
305 }
306 break;
307 case ISCSI_TM_FUNC_ABORT_TASK:
308 /*
309 * the caller has already checked if the task
310 * they want to abort was in the pending queue so if
311 * we are here the cmd pdu has gone out already, and
312 * we will only hit this for data-outs
313 */
314 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
315 task->hdr_itt == tmf->rtt) {
316 ISCSI_DBG_SESSION(conn->session,
317 "Preventing task %x/%x from sending "
318 "data-out due to abort task in "
319 "progress\n", task->itt,
320 task->hdr_itt);
321 return -EACCES;
322 }
323 break;
324 }
325
326 return 0;
327}
328
329/**
330 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
331 * @task: iscsi task
332 *
333 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
334 * fields like dlength or final based on how much data it sends
335 */
336static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
337{
338 struct iscsi_conn *conn = task->conn;
339 struct iscsi_session *session = conn->session;
340 struct scsi_cmnd *sc = task->sc;
341 struct iscsi_scsi_req *hdr;
342 unsigned hdrlength, cmd_len, transfer_length;
343 itt_t itt;
344 int rc;
345
346 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
347 if (rc)
348 return rc;
349
350 if (conn->session->tt->alloc_pdu) {
351 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
352 if (rc)
353 return rc;
354 }
355 hdr = (struct iscsi_scsi_req *)task->hdr;
356 itt = hdr->itt;
357 memset(hdr, 0, sizeof(*hdr));
358
359 if (session->tt->parse_pdu_itt)
360 hdr->itt = task->hdr_itt = itt;
361 else
362 hdr->itt = task->hdr_itt = build_itt(task->itt,
363 task->conn->session->age);
364 task->hdr_len = 0;
365 rc = iscsi_add_hdr(task, sizeof(*hdr));
366 if (rc)
367 return rc;
368 hdr->opcode = ISCSI_OP_SCSI_CMD;
369 hdr->flags = ISCSI_ATTR_SIMPLE;
370 int_to_scsilun(sc->device->lun, &hdr->lun);
371 task->lun = hdr->lun;
372 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
373 cmd_len = sc->cmd_len;
374 if (cmd_len < ISCSI_CDB_SIZE)
375 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
376 else if (cmd_len > ISCSI_CDB_SIZE) {
377 rc = iscsi_prep_ecdb_ahs(task);
378 if (rc)
379 return rc;
380 cmd_len = ISCSI_CDB_SIZE;
381 }
382 memcpy(hdr->cdb, sc->cmnd, cmd_len);
383
384 task->imm_count = 0;
385 if (scsi_bidi_cmnd(sc)) {
386 hdr->flags |= ISCSI_FLAG_CMD_READ;
387 rc = iscsi_prep_bidi_ahs(task);
388 if (rc)
389 return rc;
390 }
391
392 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
393 task->protected = true;
394
395 transfer_length = scsi_transfer_length(sc);
396 hdr->data_length = cpu_to_be32(transfer_length);
397 if (sc->sc_data_direction == DMA_TO_DEVICE) {
398 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
399
400 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
401 /*
402 * Write counters:
403 *
404 * imm_count bytes to be sent right after
405 * SCSI PDU Header
406 *
407 * unsol_count bytes(as Data-Out) to be sent
408 * without R2T ack right after
409 * immediate data
410 *
411 * r2t data_length bytes to be sent via R2T ack's
412 *
413 * pad_count bytes to be sent as zero-padding
414 */
415 memset(r2t, 0, sizeof(*r2t));
416
417 if (session->imm_data_en) {
418 if (transfer_length >= session->first_burst)
419 task->imm_count = min(session->first_burst,
420 conn->max_xmit_dlength);
421 else
422 task->imm_count = min(transfer_length,
423 conn->max_xmit_dlength);
424 hton24(hdr->dlength, task->imm_count);
425 } else
426 zero_data(hdr->dlength);
427
428 if (!session->initial_r2t_en) {
429 r2t->data_length = min(session->first_burst,
430 transfer_length) -
431 task->imm_count;
432 r2t->data_offset = task->imm_count;
433 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
434 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
435 }
436
437 if (!task->unsol_r2t.data_length)
438 /* No unsolicit Data-Out's */
439 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
440 } else {
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 zero_data(hdr->dlength);
443
444 if (sc->sc_data_direction == DMA_FROM_DEVICE)
445 hdr->flags |= ISCSI_FLAG_CMD_READ;
446 }
447
448 /* calculate size of additional header segments (AHSs) */
449 hdrlength = task->hdr_len - sizeof(*hdr);
450
451 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
452 hdrlength /= ISCSI_PAD_LEN;
453
454 WARN_ON(hdrlength >= 256);
455 hdr->hlength = hdrlength & 0xFF;
456 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
457
458 if (session->tt->init_task && session->tt->init_task(task))
459 return -EIO;
460
461 task->state = ISCSI_TASK_RUNNING;
462 session->cmdsn++;
463
464 conn->scsicmd_pdus_cnt++;
465 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
466 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
467 scsi_bidi_cmnd(sc) ? "bidirectional" :
468 sc->sc_data_direction == DMA_TO_DEVICE ?
469 "write" : "read", conn->id, sc, sc->cmnd[0],
470 task->itt, transfer_length,
471 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
472 session->cmdsn,
473 session->max_cmdsn - session->exp_cmdsn + 1);
474 return 0;
475}
476
477/**
478 * iscsi_free_task - free a task
479 * @task: iscsi cmd task
480 *
481 * Must be called with session back_lock.
482 * This function returns the scsi command to scsi-ml or cleans
483 * up mgmt tasks then returns the task to the pool.
484 */
485static void iscsi_free_task(struct iscsi_task *task)
486{
487 struct iscsi_conn *conn = task->conn;
488 struct iscsi_session *session = conn->session;
489 struct scsi_cmnd *sc = task->sc;
490 int oldstate = task->state;
491
492 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
493 task->itt, task->state, task->sc);
494
495 session->tt->cleanup_task(task);
496 task->state = ISCSI_TASK_FREE;
497 task->sc = NULL;
498 /*
499 * login task is preallocated so do not free
500 */
501 if (conn->login_task == task)
502 return;
503
504 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
505
506 if (sc) {
507 /* SCSI eh reuses commands to verify us */
508 sc->SCp.ptr = NULL;
509 /*
510 * queue command may call this to free the task, so
511 * it will decide how to return sc to scsi-ml.
512 */
513 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
514 sc->scsi_done(sc);
515 }
516}
517
518void __iscsi_get_task(struct iscsi_task *task)
519{
520 refcount_inc(&task->refcount);
521}
522EXPORT_SYMBOL_GPL(__iscsi_get_task);
523
524void __iscsi_put_task(struct iscsi_task *task)
525{
526 if (refcount_dec_and_test(&task->refcount))
527 iscsi_free_task(task);
528}
529EXPORT_SYMBOL_GPL(__iscsi_put_task);
530
531void iscsi_put_task(struct iscsi_task *task)
532{
533 struct iscsi_session *session = task->conn->session;
534
535 /* regular RX path uses back_lock */
536 spin_lock_bh(&session->back_lock);
537 __iscsi_put_task(task);
538 spin_unlock_bh(&session->back_lock);
539}
540EXPORT_SYMBOL_GPL(iscsi_put_task);
541
542/**
543 * iscsi_complete_task - finish a task
544 * @task: iscsi cmd task
545 * @state: state to complete task with
546 *
547 * Must be called with session back_lock.
548 */
549static void iscsi_complete_task(struct iscsi_task *task, int state)
550{
551 struct iscsi_conn *conn = task->conn;
552
553 ISCSI_DBG_SESSION(conn->session,
554 "complete task itt 0x%x state %d sc %p\n",
555 task->itt, task->state, task->sc);
556 if (task->state == ISCSI_TASK_COMPLETED ||
557 task->state == ISCSI_TASK_ABRT_TMF ||
558 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
559 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
560 return;
561 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
562 task->state = state;
563
564 spin_lock_bh(&conn->taskqueuelock);
565 if (!list_empty(&task->running)) {
566 pr_debug_once("%s while task on list", __func__);
567 list_del_init(&task->running);
568 }
569 spin_unlock_bh(&conn->taskqueuelock);
570
571 if (conn->task == task)
572 conn->task = NULL;
573
574 if (conn->ping_task == task)
575 conn->ping_task = NULL;
576
577 /* release get from queueing */
578 __iscsi_put_task(task);
579}
580
581/**
582 * iscsi_complete_scsi_task - finish scsi task normally
583 * @task: iscsi task for scsi cmd
584 * @exp_cmdsn: expected cmd sn in cpu format
585 * @max_cmdsn: max cmd sn in cpu format
586 *
587 * This is used when drivers do not need or cannot perform
588 * lower level pdu processing.
589 *
590 * Called with session back_lock
591 */
592void iscsi_complete_scsi_task(struct iscsi_task *task,
593 uint32_t exp_cmdsn, uint32_t max_cmdsn)
594{
595 struct iscsi_conn *conn = task->conn;
596
597 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
598
599 conn->last_recv = jiffies;
600 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
601 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
602}
603EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
604
605
606/*
607 * session back_lock must be held and if not called for a task that is
608 * still pending or from the xmit thread, then xmit thread must
609 * be suspended.
610 */
611static void fail_scsi_task(struct iscsi_task *task, int err)
612{
613 struct iscsi_conn *conn = task->conn;
614 struct scsi_cmnd *sc;
615 int state;
616
617 /*
618 * if a command completes and we get a successful tmf response
619 * we will hit this because the scsi eh abort code does not take
620 * a ref to the task.
621 */
622 sc = task->sc;
623 if (!sc)
624 return;
625
626 if (task->state == ISCSI_TASK_PENDING) {
627 /*
628 * cmd never made it to the xmit thread, so we should not count
629 * the cmd in the sequencing
630 */
631 conn->session->queued_cmdsn--;
632 /* it was never sent so just complete like normal */
633 state = ISCSI_TASK_COMPLETED;
634 } else if (err == DID_TRANSPORT_DISRUPTED)
635 state = ISCSI_TASK_ABRT_SESS_RECOV;
636 else
637 state = ISCSI_TASK_ABRT_TMF;
638
639 sc->result = err << 16;
640 if (!scsi_bidi_cmnd(sc))
641 scsi_set_resid(sc, scsi_bufflen(sc));
642 else {
643 scsi_out(sc)->resid = scsi_out(sc)->length;
644 scsi_in(sc)->resid = scsi_in(sc)->length;
645 }
646
647 /* regular RX path uses back_lock */
648 spin_lock_bh(&conn->session->back_lock);
649 iscsi_complete_task(task, state);
650 spin_unlock_bh(&conn->session->back_lock);
651}
652
653static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
654 struct iscsi_task *task)
655{
656 struct iscsi_session *session = conn->session;
657 struct iscsi_hdr *hdr = task->hdr;
658 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
659 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
660
661 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
662 return -ENOTCONN;
663
664 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
665 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
666 /*
667 * pre-format CmdSN for outgoing PDU.
668 */
669 nop->cmdsn = cpu_to_be32(session->cmdsn);
670 if (hdr->itt != RESERVED_ITT) {
671 /*
672 * TODO: We always use immediate for normal session pdus.
673 * If we start to send tmfs or nops as non-immediate then
674 * we should start checking the cmdsn numbers for mgmt tasks.
675 *
676 * During discovery sessions iscsid sends TEXT as non immediate,
677 * but we always only send one PDU at a time.
678 */
679 if (conn->c_stage == ISCSI_CONN_STARTED &&
680 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
681 session->queued_cmdsn++;
682 session->cmdsn++;
683 }
684 }
685
686 if (session->tt->init_task && session->tt->init_task(task))
687 return -EIO;
688
689 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
690 session->state = ISCSI_STATE_LOGGING_OUT;
691
692 task->state = ISCSI_TASK_RUNNING;
693 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
694 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
695 hdr->itt, task->data_count);
696 return 0;
697}
698
699static struct iscsi_task *
700__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
701 char *data, uint32_t data_size)
702{
703 struct iscsi_session *session = conn->session;
704 struct iscsi_host *ihost = shost_priv(session->host);
705 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
706 struct iscsi_task *task;
707 itt_t itt;
708
709 if (session->state == ISCSI_STATE_TERMINATE)
710 return NULL;
711
712 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
713 /*
714 * Login and Text are sent serially, in
715 * request-followed-by-response sequence.
716 * Same task can be used. Same ITT must be used.
717 * Note that login_task is preallocated at conn_create().
718 */
719 if (conn->login_task->state != ISCSI_TASK_FREE) {
720 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
721 "progress. Cannot start new task.\n");
722 return NULL;
723 }
724
725 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
726 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);
727 return NULL;
728 }
729
730 task = conn->login_task;
731 } else {
732 if (session->state != ISCSI_STATE_LOGGED_IN)
733 return NULL;
734
735 if (data_size != 0) {
736 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
737 return NULL;
738 }
739
740 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
741 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
742
743 if (!kfifo_out(&session->cmdpool.queue,
744 (void*)&task, sizeof(void*)))
745 return NULL;
746 }
747 /*
748 * released in complete pdu for task we expect a response for, and
749 * released by the lld when it has transmitted the task for
750 * pdus we do not expect a response for.
751 */
752 refcount_set(&task->refcount, 1);
753 task->conn = conn;
754 task->sc = NULL;
755 INIT_LIST_HEAD(&task->running);
756 task->state = ISCSI_TASK_PENDING;
757
758 if (data_size) {
759 memcpy(task->data, data, data_size);
760 task->data_count = data_size;
761 } else
762 task->data_count = 0;
763
764 if (conn->session->tt->alloc_pdu) {
765 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
766 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
767 "pdu for mgmt task.\n");
768 goto free_task;
769 }
770 }
771
772 itt = task->hdr->itt;
773 task->hdr_len = sizeof(struct iscsi_hdr);
774 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
775
776 if (hdr->itt != RESERVED_ITT) {
777 if (session->tt->parse_pdu_itt)
778 task->hdr->itt = itt;
779 else
780 task->hdr->itt = build_itt(task->itt,
781 task->conn->session->age);
782 }
783
784 if (!ihost->workq) {
785 if (iscsi_prep_mgmt_task(conn, task))
786 goto free_task;
787
788 if (session->tt->xmit_task(task))
789 goto free_task;
790 } else {
791 spin_lock_bh(&conn->taskqueuelock);
792 list_add_tail(&task->running, &conn->mgmtqueue);
793 spin_unlock_bh(&conn->taskqueuelock);
794 iscsi_conn_queue_work(conn);
795 }
796
797 return task;
798
799free_task:
800 /* regular RX path uses back_lock */
801 spin_lock(&session->back_lock);
802 __iscsi_put_task(task);
803 spin_unlock(&session->back_lock);
804 return NULL;
805}
806
807int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
808 char *data, uint32_t data_size)
809{
810 struct iscsi_conn *conn = cls_conn->dd_data;
811 struct iscsi_session *session = conn->session;
812 int err = 0;
813
814 spin_lock_bh(&session->frwd_lock);
815 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
816 err = -EPERM;
817 spin_unlock_bh(&session->frwd_lock);
818 return err;
819}
820EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
821
822/**
823 * iscsi_cmd_rsp - SCSI Command Response processing
824 * @conn: iscsi connection
825 * @hdr: iscsi header
826 * @task: scsi command task
827 * @data: cmd data buffer
828 * @datalen: len of buffer
829 *
830 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
831 * then completes the command and task.
832 **/
833static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
834 struct iscsi_task *task, char *data,
835 int datalen)
836{
837 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
838 struct iscsi_session *session = conn->session;
839 struct scsi_cmnd *sc = task->sc;
840
841 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
842 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
843
844 sc->result = (DID_OK << 16) | rhdr->cmd_status;
845
846 if (task->protected) {
847 sector_t sector;
848 u8 ascq;
849
850 /**
851 * Transports that didn't implement check_protection
852 * callback but still published T10-PI support to scsi-mid
853 * deserve this BUG_ON.
854 **/
855 BUG_ON(!session->tt->check_protection);
856
857 ascq = session->tt->check_protection(task, §or);
858 if (ascq) {
859 sc->result = DRIVER_SENSE << 24 |
860 SAM_STAT_CHECK_CONDITION;
861 scsi_build_sense_buffer(1, sc->sense_buffer,
862 ILLEGAL_REQUEST, 0x10, ascq);
863 scsi_set_sense_information(sc->sense_buffer,
864 SCSI_SENSE_BUFFERSIZE,
865 sector);
866 goto out;
867 }
868 }
869
870 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
871 sc->result = DID_ERROR << 16;
872 goto out;
873 }
874
875 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
876 uint16_t senselen;
877
878 if (datalen < 2) {
879invalid_datalen:
880 iscsi_conn_printk(KERN_ERR, conn,
881 "Got CHECK_CONDITION but invalid data "
882 "buffer size of %d\n", datalen);
883 sc->result = DID_BAD_TARGET << 16;
884 goto out;
885 }
886
887 senselen = get_unaligned_be16(data);
888 if (datalen < senselen)
889 goto invalid_datalen;
890
891 memcpy(sc->sense_buffer, data + 2,
892 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
893 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
894 min_t(uint16_t, senselen,
895 SCSI_SENSE_BUFFERSIZE));
896 }
897
898 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
899 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
900 int res_count = be32_to_cpu(rhdr->bi_residual_count);
901
902 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
903 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
904 res_count <= scsi_in(sc)->length))
905 scsi_in(sc)->resid = res_count;
906 else
907 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
908 }
909
910 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
911 ISCSI_FLAG_CMD_OVERFLOW)) {
912 int res_count = be32_to_cpu(rhdr->residual_count);
913
914 if (res_count > 0 &&
915 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
916 res_count <= scsi_bufflen(sc)))
917 /* write side for bidi or uni-io set_resid */
918 scsi_set_resid(sc, res_count);
919 else
920 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
921 }
922out:
923 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
924 sc, sc->result, task->itt);
925 conn->scsirsp_pdus_cnt++;
926 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
927}
928
929/**
930 * iscsi_data_in_rsp - SCSI Data-In Response processing
931 * @conn: iscsi connection
932 * @hdr: iscsi pdu
933 * @task: scsi command task
934 **/
935static void
936iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
937 struct iscsi_task *task)
938{
939 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
940 struct scsi_cmnd *sc = task->sc;
941
942 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
943 return;
944
945 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
946 sc->result = (DID_OK << 16) | rhdr->cmd_status;
947 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
948 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
949 ISCSI_FLAG_DATA_OVERFLOW)) {
950 int res_count = be32_to_cpu(rhdr->residual_count);
951
952 if (res_count > 0 &&
953 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
954 res_count <= scsi_in(sc)->length))
955 scsi_in(sc)->resid = res_count;
956 else
957 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
958 }
959
960 ISCSI_DBG_SESSION(conn->session, "data in with status done "
961 "[sc %p res %d itt 0x%x]\n",
962 sc, sc->result, task->itt);
963 conn->scsirsp_pdus_cnt++;
964 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
965}
966
967static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
968{
969 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
970
971 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
972 conn->tmfrsp_pdus_cnt++;
973
974 if (conn->tmf_state != TMF_QUEUED)
975 return;
976
977 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
978 conn->tmf_state = TMF_SUCCESS;
979 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
980 conn->tmf_state = TMF_NOT_FOUND;
981 else
982 conn->tmf_state = TMF_FAILED;
983 wake_up(&conn->ehwait);
984}
985
986static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
987{
988 struct iscsi_nopout hdr;
989 struct iscsi_task *task;
990
991 if (!rhdr && conn->ping_task)
992 return -EINVAL;
993
994 memset(&hdr, 0, sizeof(struct iscsi_nopout));
995 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
996 hdr.flags = ISCSI_FLAG_CMD_FINAL;
997
998 if (rhdr) {
999 hdr.lun = rhdr->lun;
1000 hdr.ttt = rhdr->ttt;
1001 hdr.itt = RESERVED_ITT;
1002 } else
1003 hdr.ttt = RESERVED_ITT;
1004
1005 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
1006 if (!task) {
1007 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1008 return -EIO;
1009 } else if (!rhdr) {
1010 /* only track our nops */
1011 conn->ping_task = task;
1012 conn->last_ping = jiffies;
1013 }
1014
1015 return 0;
1016}
1017
1018static int iscsi_nop_out_rsp(struct iscsi_task *task,
1019 struct iscsi_nopin *nop, char *data, int datalen)
1020{
1021 struct iscsi_conn *conn = task->conn;
1022 int rc = 0;
1023
1024 if (conn->ping_task != task) {
1025 /*
1026 * If this is not in response to one of our
1027 * nops then it must be from userspace.
1028 */
1029 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1030 data, datalen))
1031 rc = ISCSI_ERR_CONN_FAILED;
1032 } else
1033 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1034 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1035 return rc;
1036}
1037
1038static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1039 char *data, int datalen)
1040{
1041 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1042 struct iscsi_hdr rejected_pdu;
1043 int opcode, rc = 0;
1044
1045 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1046
1047 if (ntoh24(reject->dlength) > datalen ||
1048 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1049 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1050 "pdu. Invalid data length (pdu dlength "
1051 "%u, datalen %d\n", ntoh24(reject->dlength),
1052 datalen);
1053 return ISCSI_ERR_PROTO;
1054 }
1055 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1056 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1057
1058 switch (reject->reason) {
1059 case ISCSI_REASON_DATA_DIGEST_ERROR:
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "pdu (op 0x%x itt 0x%x) rejected "
1062 "due to DataDigest error.\n",
1063 opcode, rejected_pdu.itt);
1064 break;
1065 case ISCSI_REASON_IMM_CMD_REJECT:
1066 iscsi_conn_printk(KERN_ERR, conn,
1067 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1068 "immediate commands.\n",
1069 opcode, rejected_pdu.itt);
1070 /*
1071 * We only send one TMF at a time so if the target could not
1072 * handle it, then it should get fixed (RFC mandates that
1073 * a target can handle one immediate TMF per conn).
1074 *
1075 * For nops-outs, we could have sent more than one if
1076 * the target is sending us lots of nop-ins
1077 */
1078 if (opcode != ISCSI_OP_NOOP_OUT)
1079 return 0;
1080
1081 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1082 /*
1083 * nop-out in response to target's nop-out rejected.
1084 * Just resend.
1085 */
1086 /* In RX path we are under back lock */
1087 spin_unlock(&conn->session->back_lock);
1088 spin_lock(&conn->session->frwd_lock);
1089 iscsi_send_nopout(conn,
1090 (struct iscsi_nopin*)&rejected_pdu);
1091 spin_unlock(&conn->session->frwd_lock);
1092 spin_lock(&conn->session->back_lock);
1093 } else {
1094 struct iscsi_task *task;
1095 /*
1096 * Our nop as ping got dropped. We know the target
1097 * and transport are ok so just clean up
1098 */
1099 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1100 if (!task) {
1101 iscsi_conn_printk(KERN_ERR, conn,
1102 "Invalid pdu reject. Could "
1103 "not lookup rejected task.\n");
1104 rc = ISCSI_ERR_BAD_ITT;
1105 } else
1106 rc = iscsi_nop_out_rsp(task,
1107 (struct iscsi_nopin*)&rejected_pdu,
1108 NULL, 0);
1109 }
1110 break;
1111 default:
1112 iscsi_conn_printk(KERN_ERR, conn,
1113 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1114 "code 0x%x\n", rejected_pdu.opcode,
1115 rejected_pdu.itt, reject->reason);
1116 break;
1117 }
1118 return rc;
1119}
1120
1121/**
1122 * iscsi_itt_to_task - look up task by itt
1123 * @conn: iscsi connection
1124 * @itt: itt
1125 *
1126 * This should be used for mgmt tasks like login and nops, or if
1127 * the LDD's itt space does not include the session age.
1128 *
1129 * The session back_lock must be held.
1130 */
1131struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1132{
1133 struct iscsi_session *session = conn->session;
1134 int i;
1135
1136 if (itt == RESERVED_ITT)
1137 return NULL;
1138
1139 if (session->tt->parse_pdu_itt)
1140 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1141 else
1142 i = get_itt(itt);
1143 if (i >= session->cmds_max)
1144 return NULL;
1145
1146 return session->cmds[i];
1147}
1148EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1149
1150/**
1151 * __iscsi_complete_pdu - complete pdu
1152 * @conn: iscsi conn
1153 * @hdr: iscsi header
1154 * @data: data buffer
1155 * @datalen: len of data buffer
1156 *
1157 * Completes pdu processing by freeing any resources allocated at
1158 * queuecommand or send generic. session back_lock must be held and verify
1159 * itt must have been called.
1160 */
1161int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1162 char *data, int datalen)
1163{
1164 struct iscsi_session *session = conn->session;
1165 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1166 struct iscsi_task *task;
1167 uint32_t itt;
1168
1169 conn->last_recv = jiffies;
1170 rc = iscsi_verify_itt(conn, hdr->itt);
1171 if (rc)
1172 return rc;
1173
1174 if (hdr->itt != RESERVED_ITT)
1175 itt = get_itt(hdr->itt);
1176 else
1177 itt = ~0U;
1178
1179 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1180 opcode, conn->id, itt, datalen);
1181
1182 if (itt == ~0U) {
1183 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1184
1185 switch(opcode) {
1186 case ISCSI_OP_NOOP_IN:
1187 if (datalen) {
1188 rc = ISCSI_ERR_PROTO;
1189 break;
1190 }
1191
1192 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1193 break;
1194
1195 /* In RX path we are under back lock */
1196 spin_unlock(&session->back_lock);
1197 spin_lock(&session->frwd_lock);
1198 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1199 spin_unlock(&session->frwd_lock);
1200 spin_lock(&session->back_lock);
1201 break;
1202 case ISCSI_OP_REJECT:
1203 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1204 break;
1205 case ISCSI_OP_ASYNC_EVENT:
1206 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1207 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1208 rc = ISCSI_ERR_CONN_FAILED;
1209 break;
1210 default:
1211 rc = ISCSI_ERR_BAD_OPCODE;
1212 break;
1213 }
1214 goto out;
1215 }
1216
1217 switch(opcode) {
1218 case ISCSI_OP_SCSI_CMD_RSP:
1219 case ISCSI_OP_SCSI_DATA_IN:
1220 task = iscsi_itt_to_ctask(conn, hdr->itt);
1221 if (!task)
1222 return ISCSI_ERR_BAD_ITT;
1223 task->last_xfer = jiffies;
1224 break;
1225 case ISCSI_OP_R2T:
1226 /*
1227 * LLD handles R2Ts if they need to.
1228 */
1229 return 0;
1230 case ISCSI_OP_LOGOUT_RSP:
1231 case ISCSI_OP_LOGIN_RSP:
1232 case ISCSI_OP_TEXT_RSP:
1233 case ISCSI_OP_SCSI_TMFUNC_RSP:
1234 case ISCSI_OP_NOOP_IN:
1235 task = iscsi_itt_to_task(conn, hdr->itt);
1236 if (!task)
1237 return ISCSI_ERR_BAD_ITT;
1238 break;
1239 default:
1240 return ISCSI_ERR_BAD_OPCODE;
1241 }
1242
1243 switch(opcode) {
1244 case ISCSI_OP_SCSI_CMD_RSP:
1245 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1246 break;
1247 case ISCSI_OP_SCSI_DATA_IN:
1248 iscsi_data_in_rsp(conn, hdr, task);
1249 break;
1250 case ISCSI_OP_LOGOUT_RSP:
1251 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1252 if (datalen) {
1253 rc = ISCSI_ERR_PROTO;
1254 break;
1255 }
1256 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1257 goto recv_pdu;
1258 case ISCSI_OP_LOGIN_RSP:
1259 case ISCSI_OP_TEXT_RSP:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 /*
1262 * login related PDU's exp_statsn is handled in
1263 * userspace
1264 */
1265 goto recv_pdu;
1266 case ISCSI_OP_SCSI_TMFUNC_RSP:
1267 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1268 if (datalen) {
1269 rc = ISCSI_ERR_PROTO;
1270 break;
1271 }
1272
1273 iscsi_tmf_rsp(conn, hdr);
1274 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1275 break;
1276 case ISCSI_OP_NOOP_IN:
1277 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1278 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1279 rc = ISCSI_ERR_PROTO;
1280 break;
1281 }
1282 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1283
1284 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1285 data, datalen);
1286 break;
1287 default:
1288 rc = ISCSI_ERR_BAD_OPCODE;
1289 break;
1290 }
1291
1292out:
1293 return rc;
1294recv_pdu:
1295 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1296 rc = ISCSI_ERR_CONN_FAILED;
1297 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1298 return rc;
1299}
1300EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1301
1302int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1303 char *data, int datalen)
1304{
1305 int rc;
1306
1307 spin_lock(&conn->session->back_lock);
1308 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1309 spin_unlock(&conn->session->back_lock);
1310 return rc;
1311}
1312EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1313
1314int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1315{
1316 struct iscsi_session *session = conn->session;
1317 int age = 0, i = 0;
1318
1319 if (itt == RESERVED_ITT)
1320 return 0;
1321
1322 if (session->tt->parse_pdu_itt)
1323 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1324 else {
1325 i = get_itt(itt);
1326 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1327 }
1328
1329 if (age != session->age) {
1330 iscsi_conn_printk(KERN_ERR, conn,
1331 "received itt %x expected session age (%x)\n",
1332 (__force u32)itt, session->age);
1333 return ISCSI_ERR_BAD_ITT;
1334 }
1335
1336 if (i >= session->cmds_max) {
1337 iscsi_conn_printk(KERN_ERR, conn,
1338 "received invalid itt index %u (max cmds "
1339 "%u.\n", i, session->cmds_max);
1340 return ISCSI_ERR_BAD_ITT;
1341 }
1342 return 0;
1343}
1344EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1345
1346/**
1347 * iscsi_itt_to_ctask - look up ctask by itt
1348 * @conn: iscsi connection
1349 * @itt: itt
1350 *
1351 * This should be used for cmd tasks.
1352 *
1353 * The session back_lock must be held.
1354 */
1355struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1356{
1357 struct iscsi_task *task;
1358
1359 if (iscsi_verify_itt(conn, itt))
1360 return NULL;
1361
1362 task = iscsi_itt_to_task(conn, itt);
1363 if (!task || !task->sc)
1364 return NULL;
1365
1366 if (task->sc->SCp.phase != conn->session->age) {
1367 iscsi_session_printk(KERN_ERR, conn->session,
1368 "task's session age %d, expected %d\n",
1369 task->sc->SCp.phase, conn->session->age);
1370 return NULL;
1371 }
1372
1373 return task;
1374}
1375EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1376
1377void iscsi_session_failure(struct iscsi_session *session,
1378 enum iscsi_err err)
1379{
1380 struct iscsi_conn *conn;
1381 struct device *dev;
1382
1383 spin_lock_bh(&session->frwd_lock);
1384 conn = session->leadconn;
1385 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1386 spin_unlock_bh(&session->frwd_lock);
1387 return;
1388 }
1389
1390 dev = get_device(&conn->cls_conn->dev);
1391 spin_unlock_bh(&session->frwd_lock);
1392 if (!dev)
1393 return;
1394 /*
1395 * if the host is being removed bypass the connection
1396 * recovery initialization because we are going to kill
1397 * the session.
1398 */
1399 if (err == ISCSI_ERR_INVALID_HOST)
1400 iscsi_conn_error_event(conn->cls_conn, err);
1401 else
1402 iscsi_conn_failure(conn, err);
1403 put_device(dev);
1404}
1405EXPORT_SYMBOL_GPL(iscsi_session_failure);
1406
1407void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1408{
1409 struct iscsi_session *session = conn->session;
1410
1411 spin_lock_bh(&session->frwd_lock);
1412 if (session->state == ISCSI_STATE_FAILED) {
1413 spin_unlock_bh(&session->frwd_lock);
1414 return;
1415 }
1416
1417 if (conn->stop_stage == 0)
1418 session->state = ISCSI_STATE_FAILED;
1419 spin_unlock_bh(&session->frwd_lock);
1420
1421 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1422 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1423 iscsi_conn_error_event(conn->cls_conn, err);
1424}
1425EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1426
1427static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1428{
1429 struct iscsi_session *session = conn->session;
1430
1431 /*
1432 * Check for iSCSI window and take care of CmdSN wrap-around
1433 */
1434 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1435 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1436 "%u MaxCmdSN %u CmdSN %u/%u\n",
1437 session->exp_cmdsn, session->max_cmdsn,
1438 session->cmdsn, session->queued_cmdsn);
1439 return -ENOSPC;
1440 }
1441 return 0;
1442}
1443
1444static int iscsi_xmit_task(struct iscsi_conn *conn)
1445{
1446 struct iscsi_task *task = conn->task;
1447 int rc;
1448
1449 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1450 return -ENODATA;
1451
1452 __iscsi_get_task(task);
1453 spin_unlock_bh(&conn->session->frwd_lock);
1454 rc = conn->session->tt->xmit_task(task);
1455 spin_lock_bh(&conn->session->frwd_lock);
1456 if (!rc) {
1457 /* done with this task */
1458 task->last_xfer = jiffies;
1459 conn->task = NULL;
1460 }
1461 /* regular RX path uses back_lock */
1462 spin_lock(&conn->session->back_lock);
1463 __iscsi_put_task(task);
1464 spin_unlock(&conn->session->back_lock);
1465 return rc;
1466}
1467
1468/**
1469 * iscsi_requeue_task - requeue task to run from session workqueue
1470 * @task: task to requeue
1471 *
1472 * LLDs that need to run a task from the session workqueue should call
1473 * this. The session frwd_lock must be held. This should only be called
1474 * by software drivers.
1475 */
1476void iscsi_requeue_task(struct iscsi_task *task)
1477{
1478 struct iscsi_conn *conn = task->conn;
1479
1480 /*
1481 * this may be on the requeue list already if the xmit_task callout
1482 * is handling the r2ts while we are adding new ones
1483 */
1484 spin_lock_bh(&conn->taskqueuelock);
1485 if (list_empty(&task->running))
1486 list_add_tail(&task->running, &conn->requeue);
1487 spin_unlock_bh(&conn->taskqueuelock);
1488 iscsi_conn_queue_work(conn);
1489}
1490EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1491
1492/**
1493 * iscsi_data_xmit - xmit any command into the scheduled connection
1494 * @conn: iscsi connection
1495 *
1496 * Notes:
1497 * The function can return -EAGAIN in which case the caller must
1498 * re-schedule it again later or recover. '0' return code means
1499 * successful xmit.
1500 **/
1501static int iscsi_data_xmit(struct iscsi_conn *conn)
1502{
1503 struct iscsi_task *task;
1504 int rc = 0;
1505
1506 spin_lock_bh(&conn->session->frwd_lock);
1507 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1508 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1509 spin_unlock_bh(&conn->session->frwd_lock);
1510 return -ENODATA;
1511 }
1512
1513 if (conn->task) {
1514 rc = iscsi_xmit_task(conn);
1515 if (rc)
1516 goto done;
1517 }
1518
1519 /*
1520 * process mgmt pdus like nops before commands since we should
1521 * only have one nop-out as a ping from us and targets should not
1522 * overflow us with nop-ins
1523 */
1524 spin_lock_bh(&conn->taskqueuelock);
1525check_mgmt:
1526 while (!list_empty(&conn->mgmtqueue)) {
1527 conn->task = list_entry(conn->mgmtqueue.next,
1528 struct iscsi_task, running);
1529 list_del_init(&conn->task->running);
1530 spin_unlock_bh(&conn->taskqueuelock);
1531 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1532 /* regular RX path uses back_lock */
1533 spin_lock_bh(&conn->session->back_lock);
1534 __iscsi_put_task(conn->task);
1535 spin_unlock_bh(&conn->session->back_lock);
1536 conn->task = NULL;
1537 spin_lock_bh(&conn->taskqueuelock);
1538 continue;
1539 }
1540 rc = iscsi_xmit_task(conn);
1541 if (rc)
1542 goto done;
1543 spin_lock_bh(&conn->taskqueuelock);
1544 }
1545
1546 /* process pending command queue */
1547 while (!list_empty(&conn->cmdqueue)) {
1548 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1549 running);
1550 list_del_init(&conn->task->running);
1551 spin_unlock_bh(&conn->taskqueuelock);
1552 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1553 fail_scsi_task(conn->task, DID_IMM_RETRY);
1554 spin_lock_bh(&conn->taskqueuelock);
1555 continue;
1556 }
1557 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1558 if (rc) {
1559 if (rc == -ENOMEM || rc == -EACCES) {
1560 spin_lock_bh(&conn->taskqueuelock);
1561 list_add_tail(&conn->task->running,
1562 &conn->cmdqueue);
1563 conn->task = NULL;
1564 spin_unlock_bh(&conn->taskqueuelock);
1565 goto done;
1566 } else
1567 fail_scsi_task(conn->task, DID_ABORT);
1568 spin_lock_bh(&conn->taskqueuelock);
1569 continue;
1570 }
1571 rc = iscsi_xmit_task(conn);
1572 if (rc)
1573 goto done;
1574 /*
1575 * we could continuously get new task requests so
1576 * we need to check the mgmt queue for nops that need to
1577 * be sent to aviod starvation
1578 */
1579 spin_lock_bh(&conn->taskqueuelock);
1580 if (!list_empty(&conn->mgmtqueue))
1581 goto check_mgmt;
1582 }
1583
1584 while (!list_empty(&conn->requeue)) {
1585 /*
1586 * we always do fastlogout - conn stop code will clean up.
1587 */
1588 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1589 break;
1590
1591 task = list_entry(conn->requeue.next, struct iscsi_task,
1592 running);
1593 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1594 break;
1595
1596 conn->task = task;
1597 list_del_init(&conn->task->running);
1598 conn->task->state = ISCSI_TASK_RUNNING;
1599 spin_unlock_bh(&conn->taskqueuelock);
1600 rc = iscsi_xmit_task(conn);
1601 if (rc)
1602 goto done;
1603 spin_lock_bh(&conn->taskqueuelock);
1604 if (!list_empty(&conn->mgmtqueue))
1605 goto check_mgmt;
1606 }
1607 spin_unlock_bh(&conn->taskqueuelock);
1608 spin_unlock_bh(&conn->session->frwd_lock);
1609 return -ENODATA;
1610
1611done:
1612 spin_unlock_bh(&conn->session->frwd_lock);
1613 return rc;
1614}
1615
1616static void iscsi_xmitworker(struct work_struct *work)
1617{
1618 struct iscsi_conn *conn =
1619 container_of(work, struct iscsi_conn, xmitwork);
1620 int rc;
1621 /*
1622 * serialize Xmit worker on a per-connection basis.
1623 */
1624 do {
1625 rc = iscsi_data_xmit(conn);
1626 } while (rc >= 0 || rc == -EAGAIN);
1627}
1628
1629static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1630 struct scsi_cmnd *sc)
1631{
1632 struct iscsi_task *task;
1633
1634 if (!kfifo_out(&conn->session->cmdpool.queue,
1635 (void *) &task, sizeof(void *)))
1636 return NULL;
1637
1638 sc->SCp.phase = conn->session->age;
1639 sc->SCp.ptr = (char *) task;
1640
1641 refcount_set(&task->refcount, 1);
1642 task->state = ISCSI_TASK_PENDING;
1643 task->conn = conn;
1644 task->sc = sc;
1645 task->have_checked_conn = false;
1646 task->last_timeout = jiffies;
1647 task->last_xfer = jiffies;
1648 task->protected = false;
1649 INIT_LIST_HEAD(&task->running);
1650 return task;
1651}
1652
1653enum {
1654 FAILURE_BAD_HOST = 1,
1655 FAILURE_SESSION_FAILED,
1656 FAILURE_SESSION_FREED,
1657 FAILURE_WINDOW_CLOSED,
1658 FAILURE_OOM,
1659 FAILURE_SESSION_TERMINATE,
1660 FAILURE_SESSION_IN_RECOVERY,
1661 FAILURE_SESSION_RECOVERY_TIMEOUT,
1662 FAILURE_SESSION_LOGGING_OUT,
1663 FAILURE_SESSION_NOT_READY,
1664};
1665
1666int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1667{
1668 struct iscsi_cls_session *cls_session;
1669 struct iscsi_host *ihost;
1670 int reason = 0;
1671 struct iscsi_session *session;
1672 struct iscsi_conn *conn;
1673 struct iscsi_task *task = NULL;
1674
1675 sc->result = 0;
1676 sc->SCp.ptr = NULL;
1677
1678 ihost = shost_priv(host);
1679
1680 cls_session = starget_to_session(scsi_target(sc->device));
1681 session = cls_session->dd_data;
1682 spin_lock_bh(&session->frwd_lock);
1683
1684 reason = iscsi_session_chkready(cls_session);
1685 if (reason) {
1686 sc->result = reason;
1687 goto fault;
1688 }
1689
1690 if (session->state != ISCSI_STATE_LOGGED_IN) {
1691 /*
1692 * to handle the race between when we set the recovery state
1693 * and block the session we requeue here (commands could
1694 * be entering our queuecommand while a block is starting
1695 * up because the block code is not locked)
1696 */
1697 switch (session->state) {
1698 case ISCSI_STATE_FAILED:
1699 /*
1700 * cmds should fail during shutdown, if the session
1701 * state is bad, allowing completion to happen
1702 */
1703 if (unlikely(system_state != SYSTEM_RUNNING)) {
1704 reason = FAILURE_SESSION_FAILED;
1705 sc->result = DID_NO_CONNECT << 16;
1706 break;
1707 }
1708 case ISCSI_STATE_IN_RECOVERY:
1709 reason = FAILURE_SESSION_IN_RECOVERY;
1710 sc->result = DID_IMM_RETRY << 16;
1711 break;
1712 case ISCSI_STATE_LOGGING_OUT:
1713 reason = FAILURE_SESSION_LOGGING_OUT;
1714 sc->result = DID_IMM_RETRY << 16;
1715 break;
1716 case ISCSI_STATE_RECOVERY_FAILED:
1717 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1718 sc->result = DID_TRANSPORT_FAILFAST << 16;
1719 break;
1720 case ISCSI_STATE_TERMINATE:
1721 reason = FAILURE_SESSION_TERMINATE;
1722 sc->result = DID_NO_CONNECT << 16;
1723 break;
1724 default:
1725 reason = FAILURE_SESSION_FREED;
1726 sc->result = DID_NO_CONNECT << 16;
1727 }
1728 goto fault;
1729 }
1730
1731 conn = session->leadconn;
1732 if (!conn) {
1733 reason = FAILURE_SESSION_FREED;
1734 sc->result = DID_NO_CONNECT << 16;
1735 goto fault;
1736 }
1737
1738 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1739 reason = FAILURE_SESSION_IN_RECOVERY;
1740 sc->result = DID_REQUEUE << 16;
1741 goto fault;
1742 }
1743
1744 if (iscsi_check_cmdsn_window_closed(conn)) {
1745 reason = FAILURE_WINDOW_CLOSED;
1746 goto reject;
1747 }
1748
1749 task = iscsi_alloc_task(conn, sc);
1750 if (!task) {
1751 reason = FAILURE_OOM;
1752 goto reject;
1753 }
1754
1755 if (!ihost->workq) {
1756 reason = iscsi_prep_scsi_cmd_pdu(task);
1757 if (reason) {
1758 if (reason == -ENOMEM || reason == -EACCES) {
1759 reason = FAILURE_OOM;
1760 goto prepd_reject;
1761 } else {
1762 sc->result = DID_ABORT << 16;
1763 goto prepd_fault;
1764 }
1765 }
1766 if (session->tt->xmit_task(task)) {
1767 session->cmdsn--;
1768 reason = FAILURE_SESSION_NOT_READY;
1769 goto prepd_reject;
1770 }
1771 } else {
1772 spin_lock_bh(&conn->taskqueuelock);
1773 list_add_tail(&task->running, &conn->cmdqueue);
1774 spin_unlock_bh(&conn->taskqueuelock);
1775 iscsi_conn_queue_work(conn);
1776 }
1777
1778 session->queued_cmdsn++;
1779 spin_unlock_bh(&session->frwd_lock);
1780 return 0;
1781
1782prepd_reject:
1783 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1784reject:
1785 spin_unlock_bh(&session->frwd_lock);
1786 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1787 sc->cmnd[0], reason);
1788 return SCSI_MLQUEUE_TARGET_BUSY;
1789
1790prepd_fault:
1791 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1792fault:
1793 spin_unlock_bh(&session->frwd_lock);
1794 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1795 sc->cmnd[0], reason);
1796 if (!scsi_bidi_cmnd(sc))
1797 scsi_set_resid(sc, scsi_bufflen(sc));
1798 else {
1799 scsi_out(sc)->resid = scsi_out(sc)->length;
1800 scsi_in(sc)->resid = scsi_in(sc)->length;
1801 }
1802 sc->scsi_done(sc);
1803 return 0;
1804}
1805EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1806
1807int iscsi_target_alloc(struct scsi_target *starget)
1808{
1809 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1810 struct iscsi_session *session = cls_session->dd_data;
1811
1812 starget->can_queue = session->scsi_cmds_max;
1813 return 0;
1814}
1815EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1816
1817static void iscsi_tmf_timedout(struct timer_list *t)
1818{
1819 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
1820 struct iscsi_session *session = conn->session;
1821
1822 spin_lock(&session->frwd_lock);
1823 if (conn->tmf_state == TMF_QUEUED) {
1824 conn->tmf_state = TMF_TIMEDOUT;
1825 ISCSI_DBG_EH(session, "tmf timedout\n");
1826 /* unblock eh_abort() */
1827 wake_up(&conn->ehwait);
1828 }
1829 spin_unlock(&session->frwd_lock);
1830}
1831
1832static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1833 struct iscsi_tm *hdr, int age,
1834 int timeout)
1835{
1836 struct iscsi_session *session = conn->session;
1837 struct iscsi_task *task;
1838
1839 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1840 NULL, 0);
1841 if (!task) {
1842 spin_unlock_bh(&session->frwd_lock);
1843 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1844 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1845 spin_lock_bh(&session->frwd_lock);
1846 return -EPERM;
1847 }
1848 conn->tmfcmd_pdus_cnt++;
1849 conn->tmf_timer.expires = timeout * HZ + jiffies;
1850 add_timer(&conn->tmf_timer);
1851 ISCSI_DBG_EH(session, "tmf set timeout\n");
1852
1853 spin_unlock_bh(&session->frwd_lock);
1854 mutex_unlock(&session->eh_mutex);
1855
1856 /*
1857 * block eh thread until:
1858 *
1859 * 1) tmf response
1860 * 2) tmf timeout
1861 * 3) session is terminated or restarted or userspace has
1862 * given up on recovery
1863 */
1864 wait_event_interruptible(conn->ehwait, age != session->age ||
1865 session->state != ISCSI_STATE_LOGGED_IN ||
1866 conn->tmf_state != TMF_QUEUED);
1867 if (signal_pending(current))
1868 flush_signals(current);
1869 del_timer_sync(&conn->tmf_timer);
1870
1871 mutex_lock(&session->eh_mutex);
1872 spin_lock_bh(&session->frwd_lock);
1873 /* if the session drops it will clean up the task */
1874 if (age != session->age ||
1875 session->state != ISCSI_STATE_LOGGED_IN)
1876 return -ENOTCONN;
1877 return 0;
1878}
1879
1880/*
1881 * Fail commands. session lock held and recv side suspended and xmit
1882 * thread flushed
1883 */
1884static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1885{
1886 struct iscsi_task *task;
1887 int i;
1888
1889 for (i = 0; i < conn->session->cmds_max; i++) {
1890 task = conn->session->cmds[i];
1891 if (!task->sc || task->state == ISCSI_TASK_FREE)
1892 continue;
1893
1894 if (lun != -1 && lun != task->sc->device->lun)
1895 continue;
1896
1897 ISCSI_DBG_SESSION(conn->session,
1898 "failing sc %p itt 0x%x state %d\n",
1899 task->sc, task->itt, task->state);
1900 fail_scsi_task(task, error);
1901 }
1902}
1903
1904/**
1905 * iscsi_suspend_queue - suspend iscsi_queuecommand
1906 * @conn: iscsi conn to stop queueing IO on
1907 *
1908 * This grabs the session frwd_lock to make sure no one is in
1909 * xmit_task/queuecommand, and then sets suspend to prevent
1910 * new commands from being queued. This only needs to be called
1911 * by offload drivers that need to sync a path like ep disconnect
1912 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1913 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1914 */
1915void iscsi_suspend_queue(struct iscsi_conn *conn)
1916{
1917 spin_lock_bh(&conn->session->frwd_lock);
1918 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1919 spin_unlock_bh(&conn->session->frwd_lock);
1920}
1921EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1922
1923/**
1924 * iscsi_suspend_tx - suspend iscsi_data_xmit
1925 * @conn: iscsi conn tp stop processing IO on.
1926 *
1927 * This function sets the suspend bit to prevent iscsi_data_xmit
1928 * from sending new IO, and if work is queued on the xmit thread
1929 * it will wait for it to be completed.
1930 */
1931void iscsi_suspend_tx(struct iscsi_conn *conn)
1932{
1933 struct Scsi_Host *shost = conn->session->host;
1934 struct iscsi_host *ihost = shost_priv(shost);
1935
1936 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1937 if (ihost->workq)
1938 flush_workqueue(ihost->workq);
1939}
1940EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1941
1942static void iscsi_start_tx(struct iscsi_conn *conn)
1943{
1944 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1945 iscsi_conn_queue_work(conn);
1946}
1947
1948/*
1949 * We want to make sure a ping is in flight. It has timed out.
1950 * And we are not busy processing a pdu that is making
1951 * progress but got started before the ping and is taking a while
1952 * to complete so the ping is just stuck behind it in a queue.
1953 */
1954static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1955{
1956 if (conn->ping_task &&
1957 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1958 (conn->ping_timeout * HZ), jiffies))
1959 return 1;
1960 else
1961 return 0;
1962}
1963
1964enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1965{
1966 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1967 struct iscsi_task *task = NULL, *running_task;
1968 struct iscsi_cls_session *cls_session;
1969 struct iscsi_session *session;
1970 struct iscsi_conn *conn;
1971 int i;
1972
1973 cls_session = starget_to_session(scsi_target(sc->device));
1974 session = cls_session->dd_data;
1975
1976 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1977
1978 spin_lock(&session->frwd_lock);
1979 task = (struct iscsi_task *)sc->SCp.ptr;
1980 if (!task) {
1981 /*
1982 * Raced with completion. Blk layer has taken ownership
1983 * so let timeout code complete it now.
1984 */
1985 rc = BLK_EH_HANDLED;
1986 goto done;
1987 }
1988
1989 if (session->state != ISCSI_STATE_LOGGED_IN) {
1990 /*
1991 * During shutdown, if session is prematurely disconnected,
1992 * recovery won't happen and there will be hung cmds. Not
1993 * handling cmds would trigger EH, also bad in this case.
1994 * Instead, handle cmd, allow completion to happen and let
1995 * upper layer to deal with the result.
1996 */
1997 if (unlikely(system_state != SYSTEM_RUNNING)) {
1998 sc->result = DID_NO_CONNECT << 16;
1999 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2000 rc = BLK_EH_HANDLED;
2001 goto done;
2002 }
2003 /*
2004 * We are probably in the middle of iscsi recovery so let
2005 * that complete and handle the error.
2006 */
2007 rc = BLK_EH_RESET_TIMER;
2008 goto done;
2009 }
2010
2011 conn = session->leadconn;
2012 if (!conn) {
2013 /* In the middle of shuting down */
2014 rc = BLK_EH_RESET_TIMER;
2015 goto done;
2016 }
2017
2018 /*
2019 * If we have sent (at least queued to the network layer) a pdu or
2020 * recvd one for the task since the last timeout ask for
2021 * more time. If on the next timeout we have not made progress
2022 * we can check if it is the task or connection when we send the
2023 * nop as a ping.
2024 */
2025 if (time_after(task->last_xfer, task->last_timeout)) {
2026 ISCSI_DBG_EH(session, "Command making progress. Asking "
2027 "scsi-ml for more time to complete. "
2028 "Last data xfer at %lu. Last timeout was at "
2029 "%lu\n.", task->last_xfer, task->last_timeout);
2030 task->have_checked_conn = false;
2031 rc = BLK_EH_RESET_TIMER;
2032 goto done;
2033 }
2034
2035 if (!conn->recv_timeout && !conn->ping_timeout)
2036 goto done;
2037 /*
2038 * if the ping timedout then we are in the middle of cleaning up
2039 * and can let the iscsi eh handle it
2040 */
2041 if (iscsi_has_ping_timed_out(conn)) {
2042 rc = BLK_EH_RESET_TIMER;
2043 goto done;
2044 }
2045
2046 for (i = 0; i < conn->session->cmds_max; i++) {
2047 running_task = conn->session->cmds[i];
2048 if (!running_task->sc || running_task == task ||
2049 running_task->state != ISCSI_TASK_RUNNING)
2050 continue;
2051
2052 /*
2053 * Only check if cmds started before this one have made
2054 * progress, or this could never fail
2055 */
2056 if (time_after(running_task->sc->jiffies_at_alloc,
2057 task->sc->jiffies_at_alloc))
2058 continue;
2059
2060 if (time_after(running_task->last_xfer, task->last_timeout)) {
2061 /*
2062 * This task has not made progress, but a task
2063 * started before us has transferred data since
2064 * we started/last-checked. We could be queueing
2065 * too many tasks or the LU is bad.
2066 *
2067 * If the device is bad the cmds ahead of us on
2068 * other devs will complete, and this loop will
2069 * eventually fail starting the scsi eh.
2070 */
2071 ISCSI_DBG_EH(session, "Command has not made progress "
2072 "but commands ahead of it have. "
2073 "Asking scsi-ml for more time to "
2074 "complete. Our last xfer vs running task "
2075 "last xfer %lu/%lu. Last check %lu.\n",
2076 task->last_xfer, running_task->last_xfer,
2077 task->last_timeout);
2078 rc = BLK_EH_RESET_TIMER;
2079 goto done;
2080 }
2081 }
2082
2083 /* Assumes nop timeout is shorter than scsi cmd timeout */
2084 if (task->have_checked_conn)
2085 goto done;
2086
2087 /*
2088 * Checking the transport already or nop from a cmd timeout still
2089 * running
2090 */
2091 if (conn->ping_task) {
2092 task->have_checked_conn = true;
2093 rc = BLK_EH_RESET_TIMER;
2094 goto done;
2095 }
2096
2097 /* Make sure there is a transport check done */
2098 iscsi_send_nopout(conn, NULL);
2099 task->have_checked_conn = true;
2100 rc = BLK_EH_RESET_TIMER;
2101
2102done:
2103 if (task)
2104 task->last_timeout = jiffies;
2105 spin_unlock(&session->frwd_lock);
2106 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2107 "timer reset" : "shutdown or nh");
2108 return rc;
2109}
2110EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2111
2112static void iscsi_check_transport_timeouts(struct timer_list *t)
2113{
2114 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
2115 struct iscsi_session *session = conn->session;
2116 unsigned long recv_timeout, next_timeout = 0, last_recv;
2117
2118 spin_lock(&session->frwd_lock);
2119 if (session->state != ISCSI_STATE_LOGGED_IN)
2120 goto done;
2121
2122 recv_timeout = conn->recv_timeout;
2123 if (!recv_timeout)
2124 goto done;
2125
2126 recv_timeout *= HZ;
2127 last_recv = conn->last_recv;
2128
2129 if (iscsi_has_ping_timed_out(conn)) {
2130 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2131 "expired, recv timeout %d, last rx %lu, "
2132 "last ping %lu, now %lu\n",
2133 conn->ping_timeout, conn->recv_timeout,
2134 last_recv, conn->last_ping, jiffies);
2135 spin_unlock(&session->frwd_lock);
2136 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2137 return;
2138 }
2139
2140 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2141 /* send a ping to try to provoke some traffic */
2142 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2143 if (iscsi_send_nopout(conn, NULL))
2144 next_timeout = jiffies + (1 * HZ);
2145 else
2146 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2147 } else
2148 next_timeout = last_recv + recv_timeout;
2149
2150 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2151 mod_timer(&conn->transport_timer, next_timeout);
2152done:
2153 spin_unlock(&session->frwd_lock);
2154}
2155
2156static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2157 struct iscsi_tm *hdr)
2158{
2159 memset(hdr, 0, sizeof(*hdr));
2160 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2161 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2162 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2163 hdr->lun = task->lun;
2164 hdr->rtt = task->hdr_itt;
2165 hdr->refcmdsn = task->cmdsn;
2166}
2167
2168int iscsi_eh_abort(struct scsi_cmnd *sc)
2169{
2170 struct iscsi_cls_session *cls_session;
2171 struct iscsi_session *session;
2172 struct iscsi_conn *conn;
2173 struct iscsi_task *task;
2174 struct iscsi_tm *hdr;
2175 int age;
2176
2177 cls_session = starget_to_session(scsi_target(sc->device));
2178 session = cls_session->dd_data;
2179
2180 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2181
2182 mutex_lock(&session->eh_mutex);
2183 spin_lock_bh(&session->frwd_lock);
2184 /*
2185 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2186 * got the command.
2187 */
2188 if (!sc->SCp.ptr) {
2189 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2190 "it completed.\n");
2191 spin_unlock_bh(&session->frwd_lock);
2192 mutex_unlock(&session->eh_mutex);
2193 return SUCCESS;
2194 }
2195
2196 /*
2197 * If we are not logged in or we have started a new session
2198 * then let the host reset code handle this
2199 */
2200 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2201 sc->SCp.phase != session->age) {
2202 spin_unlock_bh(&session->frwd_lock);
2203 mutex_unlock(&session->eh_mutex);
2204 ISCSI_DBG_EH(session, "failing abort due to dropped "
2205 "session.\n");
2206 return FAILED;
2207 }
2208
2209 conn = session->leadconn;
2210 conn->eh_abort_cnt++;
2211 age = session->age;
2212
2213 task = (struct iscsi_task *)sc->SCp.ptr;
2214 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2215 sc, task->itt);
2216
2217 /* task completed before time out */
2218 if (!task->sc) {
2219 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2220 goto success;
2221 }
2222
2223 if (task->state == ISCSI_TASK_PENDING) {
2224 fail_scsi_task(task, DID_ABORT);
2225 goto success;
2226 }
2227
2228 /* only have one tmf outstanding at a time */
2229 if (conn->tmf_state != TMF_INITIAL)
2230 goto failed;
2231 conn->tmf_state = TMF_QUEUED;
2232
2233 hdr = &conn->tmhdr;
2234 iscsi_prep_abort_task_pdu(task, hdr);
2235
2236 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2237 goto failed;
2238
2239 switch (conn->tmf_state) {
2240 case TMF_SUCCESS:
2241 spin_unlock_bh(&session->frwd_lock);
2242 /*
2243 * stop tx side incase the target had sent a abort rsp but
2244 * the initiator was still writing out data.
2245 */
2246 iscsi_suspend_tx(conn);
2247 /*
2248 * we do not stop the recv side because targets have been
2249 * good and have never sent us a successful tmf response
2250 * then sent more data for the cmd.
2251 */
2252 spin_lock_bh(&session->frwd_lock);
2253 fail_scsi_task(task, DID_ABORT);
2254 conn->tmf_state = TMF_INITIAL;
2255 memset(hdr, 0, sizeof(*hdr));
2256 spin_unlock_bh(&session->frwd_lock);
2257 iscsi_start_tx(conn);
2258 goto success_unlocked;
2259 case TMF_TIMEDOUT:
2260 spin_unlock_bh(&session->frwd_lock);
2261 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2262 goto failed_unlocked;
2263 case TMF_NOT_FOUND:
2264 if (!sc->SCp.ptr) {
2265 conn->tmf_state = TMF_INITIAL;
2266 memset(hdr, 0, sizeof(*hdr));
2267 /* task completed before tmf abort response */
2268 ISCSI_DBG_EH(session, "sc completed while abort in "
2269 "progress\n");
2270 goto success;
2271 }
2272 /* fall through */
2273 default:
2274 conn->tmf_state = TMF_INITIAL;
2275 goto failed;
2276 }
2277
2278success:
2279 spin_unlock_bh(&session->frwd_lock);
2280success_unlocked:
2281 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2282 sc, task->itt);
2283 mutex_unlock(&session->eh_mutex);
2284 return SUCCESS;
2285
2286failed:
2287 spin_unlock_bh(&session->frwd_lock);
2288failed_unlocked:
2289 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2290 task ? task->itt : 0);
2291 mutex_unlock(&session->eh_mutex);
2292 return FAILED;
2293}
2294EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2295
2296static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2297{
2298 memset(hdr, 0, sizeof(*hdr));
2299 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2300 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2301 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2302 int_to_scsilun(sc->device->lun, &hdr->lun);
2303 hdr->rtt = RESERVED_ITT;
2304}
2305
2306int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2307{
2308 struct iscsi_cls_session *cls_session;
2309 struct iscsi_session *session;
2310 struct iscsi_conn *conn;
2311 struct iscsi_tm *hdr;
2312 int rc = FAILED;
2313
2314 cls_session = starget_to_session(scsi_target(sc->device));
2315 session = cls_session->dd_data;
2316
2317 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2318 sc->device->lun);
2319
2320 mutex_lock(&session->eh_mutex);
2321 spin_lock_bh(&session->frwd_lock);
2322 /*
2323 * Just check if we are not logged in. We cannot check for
2324 * the phase because the reset could come from a ioctl.
2325 */
2326 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2327 goto unlock;
2328 conn = session->leadconn;
2329
2330 /* only have one tmf outstanding at a time */
2331 if (conn->tmf_state != TMF_INITIAL)
2332 goto unlock;
2333 conn->tmf_state = TMF_QUEUED;
2334
2335 hdr = &conn->tmhdr;
2336 iscsi_prep_lun_reset_pdu(sc, hdr);
2337
2338 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2339 session->lu_reset_timeout)) {
2340 rc = FAILED;
2341 goto unlock;
2342 }
2343
2344 switch (conn->tmf_state) {
2345 case TMF_SUCCESS:
2346 break;
2347 case TMF_TIMEDOUT:
2348 spin_unlock_bh(&session->frwd_lock);
2349 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2350 goto done;
2351 default:
2352 conn->tmf_state = TMF_INITIAL;
2353 goto unlock;
2354 }
2355
2356 rc = SUCCESS;
2357 spin_unlock_bh(&session->frwd_lock);
2358
2359 iscsi_suspend_tx(conn);
2360
2361 spin_lock_bh(&session->frwd_lock);
2362 memset(hdr, 0, sizeof(*hdr));
2363 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2364 conn->tmf_state = TMF_INITIAL;
2365 spin_unlock_bh(&session->frwd_lock);
2366
2367 iscsi_start_tx(conn);
2368 goto done;
2369
2370unlock:
2371 spin_unlock_bh(&session->frwd_lock);
2372done:
2373 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2374 rc == SUCCESS ? "SUCCESS" : "FAILED");
2375 mutex_unlock(&session->eh_mutex);
2376 return rc;
2377}
2378EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2379
2380void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2381{
2382 struct iscsi_session *session = cls_session->dd_data;
2383
2384 spin_lock_bh(&session->frwd_lock);
2385 if (session->state != ISCSI_STATE_LOGGED_IN) {
2386 session->state = ISCSI_STATE_RECOVERY_FAILED;
2387 if (session->leadconn)
2388 wake_up(&session->leadconn->ehwait);
2389 }
2390 spin_unlock_bh(&session->frwd_lock);
2391}
2392EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2393
2394/**
2395 * iscsi_eh_session_reset - drop session and attempt relogin
2396 * @sc: scsi command
2397 *
2398 * This function will wait for a relogin, session termination from
2399 * userspace, or a recovery/replacement timeout.
2400 */
2401int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2402{
2403 struct iscsi_cls_session *cls_session;
2404 struct iscsi_session *session;
2405 struct iscsi_conn *conn;
2406
2407 cls_session = starget_to_session(scsi_target(sc->device));
2408 session = cls_session->dd_data;
2409 conn = session->leadconn;
2410
2411 mutex_lock(&session->eh_mutex);
2412 spin_lock_bh(&session->frwd_lock);
2413 if (session->state == ISCSI_STATE_TERMINATE) {
2414failed:
2415 ISCSI_DBG_EH(session,
2416 "failing session reset: Could not log back into "
2417 "%s, %s [age %d]\n", session->targetname,
2418 conn->persistent_address, session->age);
2419 spin_unlock_bh(&session->frwd_lock);
2420 mutex_unlock(&session->eh_mutex);
2421 return FAILED;
2422 }
2423
2424 spin_unlock_bh(&session->frwd_lock);
2425 mutex_unlock(&session->eh_mutex);
2426 /*
2427 * we drop the lock here but the leadconn cannot be destoyed while
2428 * we are in the scsi eh
2429 */
2430 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2431
2432 ISCSI_DBG_EH(session, "wait for relogin\n");
2433 wait_event_interruptible(conn->ehwait,
2434 session->state == ISCSI_STATE_TERMINATE ||
2435 session->state == ISCSI_STATE_LOGGED_IN ||
2436 session->state == ISCSI_STATE_RECOVERY_FAILED);
2437 if (signal_pending(current))
2438 flush_signals(current);
2439
2440 mutex_lock(&session->eh_mutex);
2441 spin_lock_bh(&session->frwd_lock);
2442 if (session->state == ISCSI_STATE_LOGGED_IN) {
2443 ISCSI_DBG_EH(session,
2444 "session reset succeeded for %s,%s\n",
2445 session->targetname, conn->persistent_address);
2446 } else
2447 goto failed;
2448 spin_unlock_bh(&session->frwd_lock);
2449 mutex_unlock(&session->eh_mutex);
2450 return SUCCESS;
2451}
2452EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2453
2454static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2455{
2456 memset(hdr, 0, sizeof(*hdr));
2457 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2458 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2459 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2460 hdr->rtt = RESERVED_ITT;
2461}
2462
2463/**
2464 * iscsi_eh_target_reset - reset target
2465 * @sc: scsi command
2466 *
2467 * This will attempt to send a warm target reset.
2468 */
2469static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2470{
2471 struct iscsi_cls_session *cls_session;
2472 struct iscsi_session *session;
2473 struct iscsi_conn *conn;
2474 struct iscsi_tm *hdr;
2475 int rc = FAILED;
2476
2477 cls_session = starget_to_session(scsi_target(sc->device));
2478 session = cls_session->dd_data;
2479
2480 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2481 session->targetname);
2482
2483 mutex_lock(&session->eh_mutex);
2484 spin_lock_bh(&session->frwd_lock);
2485 /*
2486 * Just check if we are not logged in. We cannot check for
2487 * the phase because the reset could come from a ioctl.
2488 */
2489 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2490 goto unlock;
2491 conn = session->leadconn;
2492
2493 /* only have one tmf outstanding at a time */
2494 if (conn->tmf_state != TMF_INITIAL)
2495 goto unlock;
2496 conn->tmf_state = TMF_QUEUED;
2497
2498 hdr = &conn->tmhdr;
2499 iscsi_prep_tgt_reset_pdu(sc, hdr);
2500
2501 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2502 session->tgt_reset_timeout)) {
2503 rc = FAILED;
2504 goto unlock;
2505 }
2506
2507 switch (conn->tmf_state) {
2508 case TMF_SUCCESS:
2509 break;
2510 case TMF_TIMEDOUT:
2511 spin_unlock_bh(&session->frwd_lock);
2512 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2513 goto done;
2514 default:
2515 conn->tmf_state = TMF_INITIAL;
2516 goto unlock;
2517 }
2518
2519 rc = SUCCESS;
2520 spin_unlock_bh(&session->frwd_lock);
2521
2522 iscsi_suspend_tx(conn);
2523
2524 spin_lock_bh(&session->frwd_lock);
2525 memset(hdr, 0, sizeof(*hdr));
2526 fail_scsi_tasks(conn, -1, DID_ERROR);
2527 conn->tmf_state = TMF_INITIAL;
2528 spin_unlock_bh(&session->frwd_lock);
2529
2530 iscsi_start_tx(conn);
2531 goto done;
2532
2533unlock:
2534 spin_unlock_bh(&session->frwd_lock);
2535done:
2536 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2537 rc == SUCCESS ? "SUCCESS" : "FAILED");
2538 mutex_unlock(&session->eh_mutex);
2539 return rc;
2540}
2541
2542/**
2543 * iscsi_eh_recover_target - reset target and possibly the session
2544 * @sc: scsi command
2545 *
2546 * This will attempt to send a warm target reset. If that fails,
2547 * we will escalate to ERL0 session recovery.
2548 */
2549int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2550{
2551 int rc;
2552
2553 rc = iscsi_eh_target_reset(sc);
2554 if (rc == FAILED)
2555 rc = iscsi_eh_session_reset(sc);
2556 return rc;
2557}
2558EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2559
2560/*
2561 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2562 * should be accessed via kfifo_{get,put} on q->queue.
2563 * Optionally, the caller can obtain the array of object pointers
2564 * by passing in a non-NULL @items pointer
2565 */
2566int
2567iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2568{
2569 int i, num_arrays = 1;
2570
2571 memset(q, 0, sizeof(*q));
2572
2573 q->max = max;
2574
2575 /* If the user passed an items pointer, he wants a copy of
2576 * the array. */
2577 if (items)
2578 num_arrays++;
2579 q->pool = kvzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2580 if (q->pool == NULL)
2581 return -ENOMEM;
2582
2583 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2584
2585 for (i = 0; i < max; i++) {
2586 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2587 if (q->pool[i] == NULL) {
2588 q->max = i;
2589 goto enomem;
2590 }
2591 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2592 }
2593
2594 if (items) {
2595 *items = q->pool + max;
2596 memcpy(*items, q->pool, max * sizeof(void *));
2597 }
2598
2599 return 0;
2600
2601enomem:
2602 iscsi_pool_free(q);
2603 return -ENOMEM;
2604}
2605EXPORT_SYMBOL_GPL(iscsi_pool_init);
2606
2607void iscsi_pool_free(struct iscsi_pool *q)
2608{
2609 int i;
2610
2611 for (i = 0; i < q->max; i++)
2612 kfree(q->pool[i]);
2613 kvfree(q->pool);
2614}
2615EXPORT_SYMBOL_GPL(iscsi_pool_free);
2616
2617/**
2618 * iscsi_host_add - add host to system
2619 * @shost: scsi host
2620 * @pdev: parent device
2621 *
2622 * This should be called by partial offload and software iscsi drivers
2623 * to add a host to the system.
2624 */
2625int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2626{
2627 if (!shost->can_queue)
2628 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2629
2630 if (!shost->cmd_per_lun)
2631 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2632
2633 return scsi_add_host(shost, pdev);
2634}
2635EXPORT_SYMBOL_GPL(iscsi_host_add);
2636
2637/**
2638 * iscsi_host_alloc - allocate a host and driver data
2639 * @sht: scsi host template
2640 * @dd_data_size: driver host data size
2641 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2642 *
2643 * This should be called by partial offload and software iscsi drivers.
2644 * To access the driver specific memory use the iscsi_host_priv() macro.
2645 */
2646struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2647 int dd_data_size, bool xmit_can_sleep)
2648{
2649 struct Scsi_Host *shost;
2650 struct iscsi_host *ihost;
2651
2652 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2653 if (!shost)
2654 return NULL;
2655 ihost = shost_priv(shost);
2656
2657 if (xmit_can_sleep) {
2658 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2659 "iscsi_q_%d", shost->host_no);
2660 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2661 if (!ihost->workq)
2662 goto free_host;
2663 }
2664
2665 spin_lock_init(&ihost->lock);
2666 ihost->state = ISCSI_HOST_SETUP;
2667 ihost->num_sessions = 0;
2668 init_waitqueue_head(&ihost->session_removal_wq);
2669 return shost;
2670
2671free_host:
2672 scsi_host_put(shost);
2673 return NULL;
2674}
2675EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2676
2677static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2678{
2679 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2680}
2681
2682/**
2683 * iscsi_host_remove - remove host and sessions
2684 * @shost: scsi host
2685 *
2686 * If there are any sessions left, this will initiate the removal and wait
2687 * for the completion.
2688 */
2689void iscsi_host_remove(struct Scsi_Host *shost)
2690{
2691 struct iscsi_host *ihost = shost_priv(shost);
2692 unsigned long flags;
2693
2694 spin_lock_irqsave(&ihost->lock, flags);
2695 ihost->state = ISCSI_HOST_REMOVED;
2696 spin_unlock_irqrestore(&ihost->lock, flags);
2697
2698 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2699 wait_event_interruptible(ihost->session_removal_wq,
2700 ihost->num_sessions == 0);
2701 if (signal_pending(current))
2702 flush_signals(current);
2703
2704 scsi_remove_host(shost);
2705 if (ihost->workq)
2706 destroy_workqueue(ihost->workq);
2707}
2708EXPORT_SYMBOL_GPL(iscsi_host_remove);
2709
2710void iscsi_host_free(struct Scsi_Host *shost)
2711{
2712 struct iscsi_host *ihost = shost_priv(shost);
2713
2714 kfree(ihost->netdev);
2715 kfree(ihost->hwaddress);
2716 kfree(ihost->initiatorname);
2717 scsi_host_put(shost);
2718}
2719EXPORT_SYMBOL_GPL(iscsi_host_free);
2720
2721static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2722{
2723 struct iscsi_host *ihost = shost_priv(shost);
2724 unsigned long flags;
2725
2726 shost = scsi_host_get(shost);
2727 if (!shost) {
2728 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2729 "of session teardown event because host already "
2730 "removed.\n");
2731 return;
2732 }
2733
2734 spin_lock_irqsave(&ihost->lock, flags);
2735 ihost->num_sessions--;
2736 if (ihost->num_sessions == 0)
2737 wake_up(&ihost->session_removal_wq);
2738 spin_unlock_irqrestore(&ihost->lock, flags);
2739 scsi_host_put(shost);
2740}
2741
2742/**
2743 * iscsi_session_setup - create iscsi cls session and host and session
2744 * @iscsit: iscsi transport template
2745 * @shost: scsi host
2746 * @cmds_max: session can queue
2747 * @dd_size: private driver data size, added to session allocation size
2748 * @cmd_task_size: LLD task private data size
2749 * @initial_cmdsn: initial CmdSN
2750 * @id: target ID to add to this session
2751 *
2752 * This can be used by software iscsi_transports that allocate
2753 * a session per scsi host.
2754 *
2755 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2756 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2757 * for nop handling and login/logout requests.
2758 */
2759struct iscsi_cls_session *
2760iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2761 uint16_t cmds_max, int dd_size, int cmd_task_size,
2762 uint32_t initial_cmdsn, unsigned int id)
2763{
2764 struct iscsi_host *ihost = shost_priv(shost);
2765 struct iscsi_session *session;
2766 struct iscsi_cls_session *cls_session;
2767 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2768 unsigned long flags;
2769
2770 spin_lock_irqsave(&ihost->lock, flags);
2771 if (ihost->state == ISCSI_HOST_REMOVED) {
2772 spin_unlock_irqrestore(&ihost->lock, flags);
2773 return NULL;
2774 }
2775 ihost->num_sessions++;
2776 spin_unlock_irqrestore(&ihost->lock, flags);
2777
2778 if (!total_cmds)
2779 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2780 /*
2781 * The iscsi layer needs some tasks for nop handling and tmfs,
2782 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2783 * + 1 command for scsi IO.
2784 */
2785 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2786 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2787 "must be a power of two that is at least %d.\n",
2788 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2789 goto dec_session_count;
2790 }
2791
2792 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2793 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2794 "must be a power of 2 less than or equal to %d.\n",
2795 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2796 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2797 }
2798
2799 if (!is_power_of_2(total_cmds)) {
2800 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2801 "must be a power of 2.\n", total_cmds);
2802 total_cmds = rounddown_pow_of_two(total_cmds);
2803 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2804 return NULL;
2805 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2806 total_cmds);
2807 }
2808 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2809
2810 cls_session = iscsi_alloc_session(shost, iscsit,
2811 sizeof(struct iscsi_session) +
2812 dd_size);
2813 if (!cls_session)
2814 goto dec_session_count;
2815 session = cls_session->dd_data;
2816 session->cls_session = cls_session;
2817 session->host = shost;
2818 session->state = ISCSI_STATE_FREE;
2819 session->fast_abort = 1;
2820 session->tgt_reset_timeout = 30;
2821 session->lu_reset_timeout = 15;
2822 session->abort_timeout = 10;
2823 session->scsi_cmds_max = scsi_cmds;
2824 session->cmds_max = total_cmds;
2825 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2826 session->exp_cmdsn = initial_cmdsn + 1;
2827 session->max_cmdsn = initial_cmdsn + 1;
2828 session->max_r2t = 1;
2829 session->tt = iscsit;
2830 session->dd_data = cls_session->dd_data + sizeof(*session);
2831
2832 mutex_init(&session->eh_mutex);
2833 spin_lock_init(&session->frwd_lock);
2834 spin_lock_init(&session->back_lock);
2835
2836 /* initialize SCSI PDU commands pool */
2837 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2838 (void***)&session->cmds,
2839 cmd_task_size + sizeof(struct iscsi_task)))
2840 goto cmdpool_alloc_fail;
2841
2842 /* pre-format cmds pool with ITT */
2843 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2844 struct iscsi_task *task = session->cmds[cmd_i];
2845
2846 if (cmd_task_size)
2847 task->dd_data = &task[1];
2848 task->itt = cmd_i;
2849 task->state = ISCSI_TASK_FREE;
2850 INIT_LIST_HEAD(&task->running);
2851 }
2852
2853 if (!try_module_get(iscsit->owner))
2854 goto module_get_fail;
2855
2856 if (iscsi_add_session(cls_session, id))
2857 goto cls_session_fail;
2858
2859 return cls_session;
2860
2861cls_session_fail:
2862 module_put(iscsit->owner);
2863module_get_fail:
2864 iscsi_pool_free(&session->cmdpool);
2865cmdpool_alloc_fail:
2866 iscsi_free_session(cls_session);
2867dec_session_count:
2868 iscsi_host_dec_session_cnt(shost);
2869 return NULL;
2870}
2871EXPORT_SYMBOL_GPL(iscsi_session_setup);
2872
2873/**
2874 * iscsi_session_teardown - destroy session, host, and cls_session
2875 * @cls_session: iscsi session
2876 */
2877void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2878{
2879 struct iscsi_session *session = cls_session->dd_data;
2880 struct module *owner = cls_session->transport->owner;
2881 struct Scsi_Host *shost = session->host;
2882
2883 iscsi_pool_free(&session->cmdpool);
2884
2885 iscsi_remove_session(cls_session);
2886
2887 kfree(session->password);
2888 kfree(session->password_in);
2889 kfree(session->username);
2890 kfree(session->username_in);
2891 kfree(session->targetname);
2892 kfree(session->targetalias);
2893 kfree(session->initiatorname);
2894 kfree(session->boot_root);
2895 kfree(session->boot_nic);
2896 kfree(session->boot_target);
2897 kfree(session->ifacename);
2898 kfree(session->portal_type);
2899 kfree(session->discovery_parent_type);
2900
2901 iscsi_free_session(cls_session);
2902
2903 iscsi_host_dec_session_cnt(shost);
2904 module_put(owner);
2905}
2906EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2907
2908/**
2909 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2910 * @cls_session: iscsi_cls_session
2911 * @dd_size: private driver data size
2912 * @conn_idx: cid
2913 */
2914struct iscsi_cls_conn *
2915iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2916 uint32_t conn_idx)
2917{
2918 struct iscsi_session *session = cls_session->dd_data;
2919 struct iscsi_conn *conn;
2920 struct iscsi_cls_conn *cls_conn;
2921 char *data;
2922
2923 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2924 conn_idx);
2925 if (!cls_conn)
2926 return NULL;
2927 conn = cls_conn->dd_data;
2928 memset(conn, 0, sizeof(*conn) + dd_size);
2929
2930 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2931 conn->session = session;
2932 conn->cls_conn = cls_conn;
2933 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2934 conn->id = conn_idx;
2935 conn->exp_statsn = 0;
2936 conn->tmf_state = TMF_INITIAL;
2937
2938 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
2939
2940 INIT_LIST_HEAD(&conn->mgmtqueue);
2941 INIT_LIST_HEAD(&conn->cmdqueue);
2942 INIT_LIST_HEAD(&conn->requeue);
2943 spin_lock_init(&conn->taskqueuelock);
2944 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2945
2946 /* allocate login_task used for the login/text sequences */
2947 spin_lock_bh(&session->frwd_lock);
2948 if (!kfifo_out(&session->cmdpool.queue,
2949 (void*)&conn->login_task,
2950 sizeof(void*))) {
2951 spin_unlock_bh(&session->frwd_lock);
2952 goto login_task_alloc_fail;
2953 }
2954 spin_unlock_bh(&session->frwd_lock);
2955
2956 data = (char *) __get_free_pages(GFP_KERNEL,
2957 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2958 if (!data)
2959 goto login_task_data_alloc_fail;
2960 conn->login_task->data = conn->data = data;
2961
2962 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
2963 init_waitqueue_head(&conn->ehwait);
2964
2965 return cls_conn;
2966
2967login_task_data_alloc_fail:
2968 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2969 sizeof(void*));
2970login_task_alloc_fail:
2971 iscsi_destroy_conn(cls_conn);
2972 return NULL;
2973}
2974EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2975
2976/**
2977 * iscsi_conn_teardown - teardown iscsi connection
2978 * @cls_conn: iscsi class connection
2979 *
2980 * TODO: we may need to make this into a two step process
2981 * like scsi-mls remove + put host
2982 */
2983void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2984{
2985 struct iscsi_conn *conn = cls_conn->dd_data;
2986 struct iscsi_session *session = conn->session;
2987
2988 del_timer_sync(&conn->transport_timer);
2989
2990 mutex_lock(&session->eh_mutex);
2991 spin_lock_bh(&session->frwd_lock);
2992 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2993 if (session->leadconn == conn) {
2994 /*
2995 * leading connection? then give up on recovery.
2996 */
2997 session->state = ISCSI_STATE_TERMINATE;
2998 wake_up(&conn->ehwait);
2999 }
3000 spin_unlock_bh(&session->frwd_lock);
3001
3002 /* flush queued up work because we free the connection below */
3003 iscsi_suspend_tx(conn);
3004
3005 spin_lock_bh(&session->frwd_lock);
3006 free_pages((unsigned long) conn->data,
3007 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3008 kfree(conn->persistent_address);
3009 kfree(conn->local_ipaddr);
3010 /* regular RX path uses back_lock */
3011 spin_lock_bh(&session->back_lock);
3012 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3013 sizeof(void*));
3014 spin_unlock_bh(&session->back_lock);
3015 if (session->leadconn == conn)
3016 session->leadconn = NULL;
3017 spin_unlock_bh(&session->frwd_lock);
3018 mutex_unlock(&session->eh_mutex);
3019
3020 iscsi_destroy_conn(cls_conn);
3021}
3022EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3023
3024int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3025{
3026 struct iscsi_conn *conn = cls_conn->dd_data;
3027 struct iscsi_session *session = conn->session;
3028
3029 if (!session) {
3030 iscsi_conn_printk(KERN_ERR, conn,
3031 "can't start unbound connection\n");
3032 return -EPERM;
3033 }
3034
3035 if ((session->imm_data_en || !session->initial_r2t_en) &&
3036 session->first_burst > session->max_burst) {
3037 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3038 "first_burst %d max_burst %d\n",
3039 session->first_burst, session->max_burst);
3040 return -EINVAL;
3041 }
3042
3043 if (conn->ping_timeout && !conn->recv_timeout) {
3044 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3045 "zero. Using 5 seconds\n.");
3046 conn->recv_timeout = 5;
3047 }
3048
3049 if (conn->recv_timeout && !conn->ping_timeout) {
3050 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3051 "zero. Using 5 seconds.\n");
3052 conn->ping_timeout = 5;
3053 }
3054
3055 spin_lock_bh(&session->frwd_lock);
3056 conn->c_stage = ISCSI_CONN_STARTED;
3057 session->state = ISCSI_STATE_LOGGED_IN;
3058 session->queued_cmdsn = session->cmdsn;
3059
3060 conn->last_recv = jiffies;
3061 conn->last_ping = jiffies;
3062 if (conn->recv_timeout && conn->ping_timeout)
3063 mod_timer(&conn->transport_timer,
3064 jiffies + (conn->recv_timeout * HZ));
3065
3066 switch(conn->stop_stage) {
3067 case STOP_CONN_RECOVER:
3068 /*
3069 * unblock eh_abort() if it is blocked. re-try all
3070 * commands after successful recovery
3071 */
3072 conn->stop_stage = 0;
3073 conn->tmf_state = TMF_INITIAL;
3074 session->age++;
3075 if (session->age == 16)
3076 session->age = 0;
3077 break;
3078 case STOP_CONN_TERM:
3079 conn->stop_stage = 0;
3080 break;
3081 default:
3082 break;
3083 }
3084 spin_unlock_bh(&session->frwd_lock);
3085
3086 iscsi_unblock_session(session->cls_session);
3087 wake_up(&conn->ehwait);
3088 return 0;
3089}
3090EXPORT_SYMBOL_GPL(iscsi_conn_start);
3091
3092static void
3093fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3094{
3095 struct iscsi_task *task;
3096 int i, state;
3097
3098 for (i = 0; i < conn->session->cmds_max; i++) {
3099 task = conn->session->cmds[i];
3100 if (task->sc)
3101 continue;
3102
3103 if (task->state == ISCSI_TASK_FREE)
3104 continue;
3105
3106 ISCSI_DBG_SESSION(conn->session,
3107 "failing mgmt itt 0x%x state %d\n",
3108 task->itt, task->state);
3109 state = ISCSI_TASK_ABRT_SESS_RECOV;
3110 if (task->state == ISCSI_TASK_PENDING)
3111 state = ISCSI_TASK_COMPLETED;
3112 iscsi_complete_task(task, state);
3113
3114 }
3115}
3116
3117static void iscsi_start_session_recovery(struct iscsi_session *session,
3118 struct iscsi_conn *conn, int flag)
3119{
3120 int old_stop_stage;
3121
3122 mutex_lock(&session->eh_mutex);
3123 spin_lock_bh(&session->frwd_lock);
3124 if (conn->stop_stage == STOP_CONN_TERM) {
3125 spin_unlock_bh(&session->frwd_lock);
3126 mutex_unlock(&session->eh_mutex);
3127 return;
3128 }
3129
3130 /*
3131 * When this is called for the in_login state, we only want to clean
3132 * up the login task and connection. We do not need to block and set
3133 * the recovery state again
3134 */
3135 if (flag == STOP_CONN_TERM)
3136 session->state = ISCSI_STATE_TERMINATE;
3137 else if (conn->stop_stage != STOP_CONN_RECOVER)
3138 session->state = ISCSI_STATE_IN_RECOVERY;
3139
3140 old_stop_stage = conn->stop_stage;
3141 conn->stop_stage = flag;
3142 spin_unlock_bh(&session->frwd_lock);
3143
3144 del_timer_sync(&conn->transport_timer);
3145 iscsi_suspend_tx(conn);
3146
3147 spin_lock_bh(&session->frwd_lock);
3148 conn->c_stage = ISCSI_CONN_STOPPED;
3149 spin_unlock_bh(&session->frwd_lock);
3150
3151 /*
3152 * for connection level recovery we should not calculate
3153 * header digest. conn->hdr_size used for optimization
3154 * in hdr_extract() and will be re-negotiated at
3155 * set_param() time.
3156 */
3157 if (flag == STOP_CONN_RECOVER) {
3158 conn->hdrdgst_en = 0;
3159 conn->datadgst_en = 0;
3160 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3161 old_stop_stage != STOP_CONN_RECOVER) {
3162 ISCSI_DBG_SESSION(session, "blocking session\n");
3163 iscsi_block_session(session->cls_session);
3164 }
3165 }
3166
3167 /*
3168 * flush queues.
3169 */
3170 spin_lock_bh(&session->frwd_lock);
3171 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3172 fail_mgmt_tasks(session, conn);
3173 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3174 spin_unlock_bh(&session->frwd_lock);
3175 mutex_unlock(&session->eh_mutex);
3176}
3177
3178void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3179{
3180 struct iscsi_conn *conn = cls_conn->dd_data;
3181 struct iscsi_session *session = conn->session;
3182
3183 switch (flag) {
3184 case STOP_CONN_RECOVER:
3185 case STOP_CONN_TERM:
3186 iscsi_start_session_recovery(session, conn, flag);
3187 break;
3188 default:
3189 iscsi_conn_printk(KERN_ERR, conn,
3190 "invalid stop flag %d\n", flag);
3191 }
3192}
3193EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3194
3195int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3196 struct iscsi_cls_conn *cls_conn, int is_leading)
3197{
3198 struct iscsi_session *session = cls_session->dd_data;
3199 struct iscsi_conn *conn = cls_conn->dd_data;
3200
3201 spin_lock_bh(&session->frwd_lock);
3202 if (is_leading)
3203 session->leadconn = conn;
3204 spin_unlock_bh(&session->frwd_lock);
3205
3206 /*
3207 * Unblock xmitworker(), Login Phase will pass through.
3208 */
3209 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3210 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3211 return 0;
3212}
3213EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3214
3215int iscsi_switch_str_param(char **param, char *new_val_buf)
3216{
3217 char *new_val;
3218
3219 if (*param) {
3220 if (!strcmp(*param, new_val_buf))
3221 return 0;
3222 }
3223
3224 new_val = kstrdup(new_val_buf, GFP_NOIO);
3225 if (!new_val)
3226 return -ENOMEM;
3227
3228 kfree(*param);
3229 *param = new_val;
3230 return 0;
3231}
3232EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3233
3234int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3235 enum iscsi_param param, char *buf, int buflen)
3236{
3237 struct iscsi_conn *conn = cls_conn->dd_data;
3238 struct iscsi_session *session = conn->session;
3239 int val;
3240
3241 switch(param) {
3242 case ISCSI_PARAM_FAST_ABORT:
3243 sscanf(buf, "%d", &session->fast_abort);
3244 break;
3245 case ISCSI_PARAM_ABORT_TMO:
3246 sscanf(buf, "%d", &session->abort_timeout);
3247 break;
3248 case ISCSI_PARAM_LU_RESET_TMO:
3249 sscanf(buf, "%d", &session->lu_reset_timeout);
3250 break;
3251 case ISCSI_PARAM_TGT_RESET_TMO:
3252 sscanf(buf, "%d", &session->tgt_reset_timeout);
3253 break;
3254 case ISCSI_PARAM_PING_TMO:
3255 sscanf(buf, "%d", &conn->ping_timeout);
3256 break;
3257 case ISCSI_PARAM_RECV_TMO:
3258 sscanf(buf, "%d", &conn->recv_timeout);
3259 break;
3260 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3261 sscanf(buf, "%d", &conn->max_recv_dlength);
3262 break;
3263 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3264 sscanf(buf, "%d", &conn->max_xmit_dlength);
3265 break;
3266 case ISCSI_PARAM_HDRDGST_EN:
3267 sscanf(buf, "%d", &conn->hdrdgst_en);
3268 break;
3269 case ISCSI_PARAM_DATADGST_EN:
3270 sscanf(buf, "%d", &conn->datadgst_en);
3271 break;
3272 case ISCSI_PARAM_INITIAL_R2T_EN:
3273 sscanf(buf, "%d", &session->initial_r2t_en);
3274 break;
3275 case ISCSI_PARAM_MAX_R2T:
3276 sscanf(buf, "%hu", &session->max_r2t);
3277 break;
3278 case ISCSI_PARAM_IMM_DATA_EN:
3279 sscanf(buf, "%d", &session->imm_data_en);
3280 break;
3281 case ISCSI_PARAM_FIRST_BURST:
3282 sscanf(buf, "%d", &session->first_burst);
3283 break;
3284 case ISCSI_PARAM_MAX_BURST:
3285 sscanf(buf, "%d", &session->max_burst);
3286 break;
3287 case ISCSI_PARAM_PDU_INORDER_EN:
3288 sscanf(buf, "%d", &session->pdu_inorder_en);
3289 break;
3290 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3291 sscanf(buf, "%d", &session->dataseq_inorder_en);
3292 break;
3293 case ISCSI_PARAM_ERL:
3294 sscanf(buf, "%d", &session->erl);
3295 break;
3296 case ISCSI_PARAM_EXP_STATSN:
3297 sscanf(buf, "%u", &conn->exp_statsn);
3298 break;
3299 case ISCSI_PARAM_USERNAME:
3300 return iscsi_switch_str_param(&session->username, buf);
3301 case ISCSI_PARAM_USERNAME_IN:
3302 return iscsi_switch_str_param(&session->username_in, buf);
3303 case ISCSI_PARAM_PASSWORD:
3304 return iscsi_switch_str_param(&session->password, buf);
3305 case ISCSI_PARAM_PASSWORD_IN:
3306 return iscsi_switch_str_param(&session->password_in, buf);
3307 case ISCSI_PARAM_TARGET_NAME:
3308 return iscsi_switch_str_param(&session->targetname, buf);
3309 case ISCSI_PARAM_TARGET_ALIAS:
3310 return iscsi_switch_str_param(&session->targetalias, buf);
3311 case ISCSI_PARAM_TPGT:
3312 sscanf(buf, "%d", &session->tpgt);
3313 break;
3314 case ISCSI_PARAM_PERSISTENT_PORT:
3315 sscanf(buf, "%d", &conn->persistent_port);
3316 break;
3317 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3318 return iscsi_switch_str_param(&conn->persistent_address, buf);
3319 case ISCSI_PARAM_IFACE_NAME:
3320 return iscsi_switch_str_param(&session->ifacename, buf);
3321 case ISCSI_PARAM_INITIATOR_NAME:
3322 return iscsi_switch_str_param(&session->initiatorname, buf);
3323 case ISCSI_PARAM_BOOT_ROOT:
3324 return iscsi_switch_str_param(&session->boot_root, buf);
3325 case ISCSI_PARAM_BOOT_NIC:
3326 return iscsi_switch_str_param(&session->boot_nic, buf);
3327 case ISCSI_PARAM_BOOT_TARGET:
3328 return iscsi_switch_str_param(&session->boot_target, buf);
3329 case ISCSI_PARAM_PORTAL_TYPE:
3330 return iscsi_switch_str_param(&session->portal_type, buf);
3331 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3332 return iscsi_switch_str_param(&session->discovery_parent_type,
3333 buf);
3334 case ISCSI_PARAM_DISCOVERY_SESS:
3335 sscanf(buf, "%d", &val);
3336 session->discovery_sess = !!val;
3337 break;
3338 case ISCSI_PARAM_LOCAL_IPADDR:
3339 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3340 default:
3341 return -ENOSYS;
3342 }
3343
3344 return 0;
3345}
3346EXPORT_SYMBOL_GPL(iscsi_set_param);
3347
3348int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3349 enum iscsi_param param, char *buf)
3350{
3351 struct iscsi_session *session = cls_session->dd_data;
3352 int len;
3353
3354 switch(param) {
3355 case ISCSI_PARAM_FAST_ABORT:
3356 len = sprintf(buf, "%d\n", session->fast_abort);
3357 break;
3358 case ISCSI_PARAM_ABORT_TMO:
3359 len = sprintf(buf, "%d\n", session->abort_timeout);
3360 break;
3361 case ISCSI_PARAM_LU_RESET_TMO:
3362 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3363 break;
3364 case ISCSI_PARAM_TGT_RESET_TMO:
3365 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3366 break;
3367 case ISCSI_PARAM_INITIAL_R2T_EN:
3368 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3369 break;
3370 case ISCSI_PARAM_MAX_R2T:
3371 len = sprintf(buf, "%hu\n", session->max_r2t);
3372 break;
3373 case ISCSI_PARAM_IMM_DATA_EN:
3374 len = sprintf(buf, "%d\n", session->imm_data_en);
3375 break;
3376 case ISCSI_PARAM_FIRST_BURST:
3377 len = sprintf(buf, "%u\n", session->first_burst);
3378 break;
3379 case ISCSI_PARAM_MAX_BURST:
3380 len = sprintf(buf, "%u\n", session->max_burst);
3381 break;
3382 case ISCSI_PARAM_PDU_INORDER_EN:
3383 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3384 break;
3385 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3386 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3387 break;
3388 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3389 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3390 break;
3391 case ISCSI_PARAM_ERL:
3392 len = sprintf(buf, "%d\n", session->erl);
3393 break;
3394 case ISCSI_PARAM_TARGET_NAME:
3395 len = sprintf(buf, "%s\n", session->targetname);
3396 break;
3397 case ISCSI_PARAM_TARGET_ALIAS:
3398 len = sprintf(buf, "%s\n", session->targetalias);
3399 break;
3400 case ISCSI_PARAM_TPGT:
3401 len = sprintf(buf, "%d\n", session->tpgt);
3402 break;
3403 case ISCSI_PARAM_USERNAME:
3404 len = sprintf(buf, "%s\n", session->username);
3405 break;
3406 case ISCSI_PARAM_USERNAME_IN:
3407 len = sprintf(buf, "%s\n", session->username_in);
3408 break;
3409 case ISCSI_PARAM_PASSWORD:
3410 len = sprintf(buf, "%s\n", session->password);
3411 break;
3412 case ISCSI_PARAM_PASSWORD_IN:
3413 len = sprintf(buf, "%s\n", session->password_in);
3414 break;
3415 case ISCSI_PARAM_IFACE_NAME:
3416 len = sprintf(buf, "%s\n", session->ifacename);
3417 break;
3418 case ISCSI_PARAM_INITIATOR_NAME:
3419 len = sprintf(buf, "%s\n", session->initiatorname);
3420 break;
3421 case ISCSI_PARAM_BOOT_ROOT:
3422 len = sprintf(buf, "%s\n", session->boot_root);
3423 break;
3424 case ISCSI_PARAM_BOOT_NIC:
3425 len = sprintf(buf, "%s\n", session->boot_nic);
3426 break;
3427 case ISCSI_PARAM_BOOT_TARGET:
3428 len = sprintf(buf, "%s\n", session->boot_target);
3429 break;
3430 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3431 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3432 break;
3433 case ISCSI_PARAM_DISCOVERY_SESS:
3434 len = sprintf(buf, "%u\n", session->discovery_sess);
3435 break;
3436 case ISCSI_PARAM_PORTAL_TYPE:
3437 len = sprintf(buf, "%s\n", session->portal_type);
3438 break;
3439 case ISCSI_PARAM_CHAP_AUTH_EN:
3440 len = sprintf(buf, "%u\n", session->chap_auth_en);
3441 break;
3442 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3443 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3444 break;
3445 case ISCSI_PARAM_BIDI_CHAP_EN:
3446 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3447 break;
3448 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3449 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3450 break;
3451 case ISCSI_PARAM_DEF_TIME2WAIT:
3452 len = sprintf(buf, "%d\n", session->time2wait);
3453 break;
3454 case ISCSI_PARAM_DEF_TIME2RETAIN:
3455 len = sprintf(buf, "%d\n", session->time2retain);
3456 break;
3457 case ISCSI_PARAM_TSID:
3458 len = sprintf(buf, "%u\n", session->tsid);
3459 break;
3460 case ISCSI_PARAM_ISID:
3461 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3462 session->isid[0], session->isid[1],
3463 session->isid[2], session->isid[3],
3464 session->isid[4], session->isid[5]);
3465 break;
3466 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3467 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3468 break;
3469 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3470 if (session->discovery_parent_type)
3471 len = sprintf(buf, "%s\n",
3472 session->discovery_parent_type);
3473 else
3474 len = sprintf(buf, "\n");
3475 break;
3476 default:
3477 return -ENOSYS;
3478 }
3479
3480 return len;
3481}
3482EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3483
3484int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3485 enum iscsi_param param, char *buf)
3486{
3487 struct sockaddr_in6 *sin6 = NULL;
3488 struct sockaddr_in *sin = NULL;
3489 int len;
3490
3491 switch (addr->ss_family) {
3492 case AF_INET:
3493 sin = (struct sockaddr_in *)addr;
3494 break;
3495 case AF_INET6:
3496 sin6 = (struct sockaddr_in6 *)addr;
3497 break;
3498 default:
3499 return -EINVAL;
3500 }
3501
3502 switch (param) {
3503 case ISCSI_PARAM_CONN_ADDRESS:
3504 case ISCSI_HOST_PARAM_IPADDRESS:
3505 if (sin)
3506 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3507 else
3508 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3509 break;
3510 case ISCSI_PARAM_CONN_PORT:
3511 case ISCSI_PARAM_LOCAL_PORT:
3512 if (sin)
3513 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3514 else
3515 len = sprintf(buf, "%hu\n",
3516 be16_to_cpu(sin6->sin6_port));
3517 break;
3518 default:
3519 return -EINVAL;
3520 }
3521
3522 return len;
3523}
3524EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3525
3526int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3527 enum iscsi_param param, char *buf)
3528{
3529 struct iscsi_conn *conn = cls_conn->dd_data;
3530 int len;
3531
3532 switch(param) {
3533 case ISCSI_PARAM_PING_TMO:
3534 len = sprintf(buf, "%u\n", conn->ping_timeout);
3535 break;
3536 case ISCSI_PARAM_RECV_TMO:
3537 len = sprintf(buf, "%u\n", conn->recv_timeout);
3538 break;
3539 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3540 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3541 break;
3542 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3543 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3544 break;
3545 case ISCSI_PARAM_HDRDGST_EN:
3546 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3547 break;
3548 case ISCSI_PARAM_DATADGST_EN:
3549 len = sprintf(buf, "%d\n", conn->datadgst_en);
3550 break;
3551 case ISCSI_PARAM_IFMARKER_EN:
3552 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3553 break;
3554 case ISCSI_PARAM_OFMARKER_EN:
3555 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3556 break;
3557 case ISCSI_PARAM_EXP_STATSN:
3558 len = sprintf(buf, "%u\n", conn->exp_statsn);
3559 break;
3560 case ISCSI_PARAM_PERSISTENT_PORT:
3561 len = sprintf(buf, "%d\n", conn->persistent_port);
3562 break;
3563 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3564 len = sprintf(buf, "%s\n", conn->persistent_address);
3565 break;
3566 case ISCSI_PARAM_STATSN:
3567 len = sprintf(buf, "%u\n", conn->statsn);
3568 break;
3569 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3570 len = sprintf(buf, "%u\n", conn->max_segment_size);
3571 break;
3572 case ISCSI_PARAM_KEEPALIVE_TMO:
3573 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3574 break;
3575 case ISCSI_PARAM_LOCAL_PORT:
3576 len = sprintf(buf, "%u\n", conn->local_port);
3577 break;
3578 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3579 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3580 break;
3581 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3582 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3583 break;
3584 case ISCSI_PARAM_TCP_WSF_DISABLE:
3585 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3586 break;
3587 case ISCSI_PARAM_TCP_TIMER_SCALE:
3588 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3589 break;
3590 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3591 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3592 break;
3593 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3594 len = sprintf(buf, "%u\n", conn->fragment_disable);
3595 break;
3596 case ISCSI_PARAM_IPV4_TOS:
3597 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3598 break;
3599 case ISCSI_PARAM_IPV6_TC:
3600 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3601 break;
3602 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3603 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3604 break;
3605 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3606 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3607 break;
3608 case ISCSI_PARAM_TCP_XMIT_WSF:
3609 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3610 break;
3611 case ISCSI_PARAM_TCP_RECV_WSF:
3612 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3613 break;
3614 case ISCSI_PARAM_LOCAL_IPADDR:
3615 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3616 break;
3617 default:
3618 return -ENOSYS;
3619 }
3620
3621 return len;
3622}
3623EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3624
3625int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3626 char *buf)
3627{
3628 struct iscsi_host *ihost = shost_priv(shost);
3629 int len;
3630
3631 switch (param) {
3632 case ISCSI_HOST_PARAM_NETDEV_NAME:
3633 len = sprintf(buf, "%s\n", ihost->netdev);
3634 break;
3635 case ISCSI_HOST_PARAM_HWADDRESS:
3636 len = sprintf(buf, "%s\n", ihost->hwaddress);
3637 break;
3638 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3639 len = sprintf(buf, "%s\n", ihost->initiatorname);
3640 break;
3641 default:
3642 return -ENOSYS;
3643 }
3644
3645 return len;
3646}
3647EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3648
3649int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3650 char *buf, int buflen)
3651{
3652 struct iscsi_host *ihost = shost_priv(shost);
3653
3654 switch (param) {
3655 case ISCSI_HOST_PARAM_NETDEV_NAME:
3656 return iscsi_switch_str_param(&ihost->netdev, buf);
3657 case ISCSI_HOST_PARAM_HWADDRESS:
3658 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3659 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3660 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3661 default:
3662 return -ENOSYS;
3663 }
3664
3665 return 0;
3666}
3667EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3668
3669MODULE_AUTHOR("Mike Christie");
3670MODULE_DESCRIPTION("iSCSI library functions");
3671MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * iSCSI lib functions
4 *
5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2004 - 2006 Mike Christie
7 * Copyright (C) 2004 - 2005 Dmitry Yusupov
8 * Copyright (C) 2004 - 2005 Alex Aizman
9 * maintained by open-iscsi@googlegroups.com
10 */
11#include <linux/types.h>
12#include <linux/kfifo.h>
13#include <linux/delay.h>
14#include <linux/log2.h>
15#include <linux/slab.h>
16#include <linux/sched/signal.h>
17#include <linux/module.h>
18#include <asm/unaligned.h>
19#include <net/tcp.h>
20#include <scsi/scsi_cmnd.h>
21#include <scsi/scsi_device.h>
22#include <scsi/scsi_eh.h>
23#include <scsi/scsi_tcq.h>
24#include <scsi/scsi_host.h>
25#include <scsi/scsi.h>
26#include <scsi/iscsi_proto.h>
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_iscsi.h>
29#include <scsi/libiscsi.h>
30#include <trace/events/iscsi.h>
31
32static int iscsi_dbg_lib_conn;
33module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
34 S_IRUGO | S_IWUSR);
35MODULE_PARM_DESC(debug_libiscsi_conn,
36 "Turn on debugging for connections in libiscsi module. "
37 "Set to 1 to turn on, and zero to turn off. Default is off.");
38
39static int iscsi_dbg_lib_session;
40module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
41 S_IRUGO | S_IWUSR);
42MODULE_PARM_DESC(debug_libiscsi_session,
43 "Turn on debugging for sessions in libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default is off.");
45
46static int iscsi_dbg_lib_eh;
47module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
48 S_IRUGO | S_IWUSR);
49MODULE_PARM_DESC(debug_libiscsi_eh,
50 "Turn on debugging for error handling in libiscsi module. "
51 "Set to 1 to turn on, and zero to turn off. Default is off.");
52
53#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
54 do { \
55 if (iscsi_dbg_lib_conn) \
56 iscsi_conn_printk(KERN_INFO, _conn, \
57 "%s " dbg_fmt, \
58 __func__, ##arg); \
59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
60 &(_conn)->cls_conn->dev, \
61 "%s " dbg_fmt, __func__, ##arg);\
62 } while (0);
63
64#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
65 do { \
66 if (iscsi_dbg_lib_session) \
67 iscsi_session_printk(KERN_INFO, _session, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 iscsi_dbg_trace(trace_iscsi_dbg_session, \
71 &(_session)->cls_session->dev, \
72 "%s " dbg_fmt, __func__, ##arg); \
73 } while (0);
74
75#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
76 do { \
77 if (iscsi_dbg_lib_eh) \
78 iscsi_session_printk(KERN_INFO, _session, \
79 "%s " dbg_fmt, \
80 __func__, ##arg); \
81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
82 &(_session)->cls_session->dev, \
83 "%s " dbg_fmt, __func__, ##arg); \
84 } while (0);
85
86inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
87{
88 struct Scsi_Host *shost = conn->session->host;
89 struct iscsi_host *ihost = shost_priv(shost);
90
91 if (ihost->workq)
92 queue_work(ihost->workq, &conn->xmitwork);
93}
94EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
95
96static void __iscsi_update_cmdsn(struct iscsi_session *session,
97 uint32_t exp_cmdsn, uint32_t max_cmdsn)
98{
99 /*
100 * standard specifies this check for when to update expected and
101 * max sequence numbers
102 */
103 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
104 return;
105
106 if (exp_cmdsn != session->exp_cmdsn &&
107 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
108 session->exp_cmdsn = exp_cmdsn;
109
110 if (max_cmdsn != session->max_cmdsn &&
111 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
112 session->max_cmdsn = max_cmdsn;
113}
114
115void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
116{
117 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
118 be32_to_cpu(hdr->max_cmdsn));
119}
120EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
121
122/**
123 * iscsi_prep_data_out_pdu - initialize Data-Out
124 * @task: scsi command task
125 * @r2t: R2T info
126 * @hdr: iscsi data in pdu
127 *
128 * Notes:
129 * Initialize Data-Out within this R2T sequence and finds
130 * proper data_offset within this SCSI command.
131 *
132 * This function is called with connection lock taken.
133 **/
134void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
135 struct iscsi_data *hdr)
136{
137 struct iscsi_conn *conn = task->conn;
138 unsigned int left = r2t->data_length - r2t->sent;
139
140 task->hdr_len = sizeof(struct iscsi_data);
141
142 memset(hdr, 0, sizeof(struct iscsi_data));
143 hdr->ttt = r2t->ttt;
144 hdr->datasn = cpu_to_be32(r2t->datasn);
145 r2t->datasn++;
146 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
147 hdr->lun = task->lun;
148 hdr->itt = task->hdr_itt;
149 hdr->exp_statsn = r2t->exp_statsn;
150 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
151 if (left > conn->max_xmit_dlength) {
152 hton24(hdr->dlength, conn->max_xmit_dlength);
153 r2t->data_count = conn->max_xmit_dlength;
154 hdr->flags = 0;
155 } else {
156 hton24(hdr->dlength, left);
157 r2t->data_count = left;
158 hdr->flags = ISCSI_FLAG_CMD_FINAL;
159 }
160 conn->dataout_pdus_cnt++;
161}
162EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
163
164static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
165{
166 unsigned exp_len = task->hdr_len + len;
167
168 if (exp_len > task->hdr_max) {
169 WARN_ON(1);
170 return -EINVAL;
171 }
172
173 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
174 task->hdr_len = exp_len;
175 return 0;
176}
177
178/*
179 * make an extended cdb AHS
180 */
181static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
182{
183 struct scsi_cmnd *cmd = task->sc;
184 unsigned rlen, pad_len;
185 unsigned short ahslength;
186 struct iscsi_ecdb_ahdr *ecdb_ahdr;
187 int rc;
188
189 ecdb_ahdr = iscsi_next_hdr(task);
190 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
191
192 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
193 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
194
195 pad_len = iscsi_padding(rlen);
196
197 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
198 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
199 if (rc)
200 return rc;
201
202 if (pad_len)
203 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
204
205 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
206 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
207 ecdb_ahdr->reserved = 0;
208 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
209
210 ISCSI_DBG_SESSION(task->conn->session,
211 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
212 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
213 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
214 task->hdr_len);
215 return 0;
216}
217
218/**
219 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
220 * @task: iscsi task
221 * @opcode: opcode to check for
222 *
223 * During TMF a task has to be checked if it's affected.
224 * All unrelated I/O can be passed through, but I/O to the
225 * affected LUN should be restricted.
226 * If 'fast_abort' is set we won't be sending any I/O to the
227 * affected LUN.
228 * Otherwise the target is waiting for all TTTs to be completed,
229 * so we have to send all outstanding Data-Out PDUs to the target.
230 */
231static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
232{
233 struct iscsi_conn *conn = task->conn;
234 struct iscsi_tm *tmf = &conn->tmhdr;
235 u64 hdr_lun;
236
237 if (conn->tmf_state == TMF_INITIAL)
238 return 0;
239
240 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
241 return 0;
242
243 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
244 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
245 /*
246 * Allow PDUs for unrelated LUNs
247 */
248 hdr_lun = scsilun_to_int(&tmf->lun);
249 if (hdr_lun != task->sc->device->lun)
250 return 0;
251 fallthrough;
252 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
253 /*
254 * Fail all SCSI cmd PDUs
255 */
256 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
257 iscsi_conn_printk(KERN_INFO, conn,
258 "task [op %x itt "
259 "0x%x/0x%x] "
260 "rejected.\n",
261 opcode, task->itt,
262 task->hdr_itt);
263 return -EACCES;
264 }
265 /*
266 * And also all data-out PDUs in response to R2T
267 * if fast_abort is set.
268 */
269 if (conn->session->fast_abort) {
270 iscsi_conn_printk(KERN_INFO, conn,
271 "task [op %x itt "
272 "0x%x/0x%x] fast abort.\n",
273 opcode, task->itt,
274 task->hdr_itt);
275 return -EACCES;
276 }
277 break;
278 case ISCSI_TM_FUNC_ABORT_TASK:
279 /*
280 * the caller has already checked if the task
281 * they want to abort was in the pending queue so if
282 * we are here the cmd pdu has gone out already, and
283 * we will only hit this for data-outs
284 */
285 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
286 task->hdr_itt == tmf->rtt) {
287 ISCSI_DBG_SESSION(conn->session,
288 "Preventing task %x/%x from sending "
289 "data-out due to abort task in "
290 "progress\n", task->itt,
291 task->hdr_itt);
292 return -EACCES;
293 }
294 break;
295 }
296
297 return 0;
298}
299
300/**
301 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
302 * @task: iscsi task
303 *
304 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
305 * fields like dlength or final based on how much data it sends
306 */
307static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
308{
309 struct iscsi_conn *conn = task->conn;
310 struct iscsi_session *session = conn->session;
311 struct scsi_cmnd *sc = task->sc;
312 struct iscsi_scsi_req *hdr;
313 unsigned hdrlength, cmd_len, transfer_length;
314 itt_t itt;
315 int rc;
316
317 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
318 if (rc)
319 return rc;
320
321 if (conn->session->tt->alloc_pdu) {
322 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
323 if (rc)
324 return rc;
325 }
326 hdr = (struct iscsi_scsi_req *)task->hdr;
327 itt = hdr->itt;
328 memset(hdr, 0, sizeof(*hdr));
329
330 if (session->tt->parse_pdu_itt)
331 hdr->itt = task->hdr_itt = itt;
332 else
333 hdr->itt = task->hdr_itt = build_itt(task->itt,
334 task->conn->session->age);
335 task->hdr_len = 0;
336 rc = iscsi_add_hdr(task, sizeof(*hdr));
337 if (rc)
338 return rc;
339 hdr->opcode = ISCSI_OP_SCSI_CMD;
340 hdr->flags = ISCSI_ATTR_SIMPLE;
341 int_to_scsilun(sc->device->lun, &hdr->lun);
342 task->lun = hdr->lun;
343 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
344 cmd_len = sc->cmd_len;
345 if (cmd_len < ISCSI_CDB_SIZE)
346 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
347 else if (cmd_len > ISCSI_CDB_SIZE) {
348 rc = iscsi_prep_ecdb_ahs(task);
349 if (rc)
350 return rc;
351 cmd_len = ISCSI_CDB_SIZE;
352 }
353 memcpy(hdr->cdb, sc->cmnd, cmd_len);
354
355 task->imm_count = 0;
356 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
357 task->protected = true;
358
359 transfer_length = scsi_transfer_length(sc);
360 hdr->data_length = cpu_to_be32(transfer_length);
361 if (sc->sc_data_direction == DMA_TO_DEVICE) {
362 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
363
364 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
365 /*
366 * Write counters:
367 *
368 * imm_count bytes to be sent right after
369 * SCSI PDU Header
370 *
371 * unsol_count bytes(as Data-Out) to be sent
372 * without R2T ack right after
373 * immediate data
374 *
375 * r2t data_length bytes to be sent via R2T ack's
376 *
377 * pad_count bytes to be sent as zero-padding
378 */
379 memset(r2t, 0, sizeof(*r2t));
380
381 if (session->imm_data_en) {
382 if (transfer_length >= session->first_burst)
383 task->imm_count = min(session->first_burst,
384 conn->max_xmit_dlength);
385 else
386 task->imm_count = min(transfer_length,
387 conn->max_xmit_dlength);
388 hton24(hdr->dlength, task->imm_count);
389 } else
390 zero_data(hdr->dlength);
391
392 if (!session->initial_r2t_en) {
393 r2t->data_length = min(session->first_burst,
394 transfer_length) -
395 task->imm_count;
396 r2t->data_offset = task->imm_count;
397 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
398 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
399 }
400
401 if (!task->unsol_r2t.data_length)
402 /* No unsolicit Data-Out's */
403 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
404 } else {
405 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
406 zero_data(hdr->dlength);
407
408 if (sc->sc_data_direction == DMA_FROM_DEVICE)
409 hdr->flags |= ISCSI_FLAG_CMD_READ;
410 }
411
412 /* calculate size of additional header segments (AHSs) */
413 hdrlength = task->hdr_len - sizeof(*hdr);
414
415 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
416 hdrlength /= ISCSI_PAD_LEN;
417
418 WARN_ON(hdrlength >= 256);
419 hdr->hlength = hdrlength & 0xFF;
420 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
421
422 if (session->tt->init_task && session->tt->init_task(task))
423 return -EIO;
424
425 task->state = ISCSI_TASK_RUNNING;
426 session->cmdsn++;
427
428 conn->scsicmd_pdus_cnt++;
429 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
430 "itt 0x%x len %d cmdsn %d win %d]\n",
431 sc->sc_data_direction == DMA_TO_DEVICE ?
432 "write" : "read", conn->id, sc, sc->cmnd[0],
433 task->itt, transfer_length,
434 session->cmdsn,
435 session->max_cmdsn - session->exp_cmdsn + 1);
436 return 0;
437}
438
439/**
440 * iscsi_free_task - free a task
441 * @task: iscsi cmd task
442 *
443 * Must be called with session back_lock.
444 * This function returns the scsi command to scsi-ml or cleans
445 * up mgmt tasks then returns the task to the pool.
446 */
447static void iscsi_free_task(struct iscsi_task *task)
448{
449 struct iscsi_conn *conn = task->conn;
450 struct iscsi_session *session = conn->session;
451 struct scsi_cmnd *sc = task->sc;
452 int oldstate = task->state;
453
454 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
455 task->itt, task->state, task->sc);
456
457 session->tt->cleanup_task(task);
458 task->state = ISCSI_TASK_FREE;
459 task->sc = NULL;
460 /*
461 * login task is preallocated so do not free
462 */
463 if (conn->login_task == task)
464 return;
465
466 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
467
468 if (sc) {
469 /* SCSI eh reuses commands to verify us */
470 sc->SCp.ptr = NULL;
471 /*
472 * queue command may call this to free the task, so
473 * it will decide how to return sc to scsi-ml.
474 */
475 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
476 sc->scsi_done(sc);
477 }
478}
479
480void __iscsi_get_task(struct iscsi_task *task)
481{
482 refcount_inc(&task->refcount);
483}
484EXPORT_SYMBOL_GPL(__iscsi_get_task);
485
486void __iscsi_put_task(struct iscsi_task *task)
487{
488 if (refcount_dec_and_test(&task->refcount))
489 iscsi_free_task(task);
490}
491EXPORT_SYMBOL_GPL(__iscsi_put_task);
492
493void iscsi_put_task(struct iscsi_task *task)
494{
495 struct iscsi_session *session = task->conn->session;
496
497 /* regular RX path uses back_lock */
498 spin_lock_bh(&session->back_lock);
499 __iscsi_put_task(task);
500 spin_unlock_bh(&session->back_lock);
501}
502EXPORT_SYMBOL_GPL(iscsi_put_task);
503
504/**
505 * iscsi_complete_task - finish a task
506 * @task: iscsi cmd task
507 * @state: state to complete task with
508 *
509 * Must be called with session back_lock.
510 */
511static void iscsi_complete_task(struct iscsi_task *task, int state)
512{
513 struct iscsi_conn *conn = task->conn;
514
515 ISCSI_DBG_SESSION(conn->session,
516 "complete task itt 0x%x state %d sc %p\n",
517 task->itt, task->state, task->sc);
518 if (task->state == ISCSI_TASK_COMPLETED ||
519 task->state == ISCSI_TASK_ABRT_TMF ||
520 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
521 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
522 return;
523 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
524 task->state = state;
525
526 spin_lock_bh(&conn->taskqueuelock);
527 if (!list_empty(&task->running)) {
528 pr_debug_once("%s while task on list", __func__);
529 list_del_init(&task->running);
530 }
531 spin_unlock_bh(&conn->taskqueuelock);
532
533 if (conn->task == task)
534 conn->task = NULL;
535
536 if (conn->ping_task == task)
537 conn->ping_task = NULL;
538
539 /* release get from queueing */
540 __iscsi_put_task(task);
541}
542
543/**
544 * iscsi_complete_scsi_task - finish scsi task normally
545 * @task: iscsi task for scsi cmd
546 * @exp_cmdsn: expected cmd sn in cpu format
547 * @max_cmdsn: max cmd sn in cpu format
548 *
549 * This is used when drivers do not need or cannot perform
550 * lower level pdu processing.
551 *
552 * Called with session back_lock
553 */
554void iscsi_complete_scsi_task(struct iscsi_task *task,
555 uint32_t exp_cmdsn, uint32_t max_cmdsn)
556{
557 struct iscsi_conn *conn = task->conn;
558
559 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
560
561 conn->last_recv = jiffies;
562 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
563 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
564}
565EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
566
567
568/*
569 * session back_lock must be held and if not called for a task that is
570 * still pending or from the xmit thread, then xmit thread must
571 * be suspended.
572 */
573static void fail_scsi_task(struct iscsi_task *task, int err)
574{
575 struct iscsi_conn *conn = task->conn;
576 struct scsi_cmnd *sc;
577 int state;
578
579 /*
580 * if a command completes and we get a successful tmf response
581 * we will hit this because the scsi eh abort code does not take
582 * a ref to the task.
583 */
584 sc = task->sc;
585 if (!sc)
586 return;
587
588 if (task->state == ISCSI_TASK_PENDING) {
589 /*
590 * cmd never made it to the xmit thread, so we should not count
591 * the cmd in the sequencing
592 */
593 conn->session->queued_cmdsn--;
594 /* it was never sent so just complete like normal */
595 state = ISCSI_TASK_COMPLETED;
596 } else if (err == DID_TRANSPORT_DISRUPTED)
597 state = ISCSI_TASK_ABRT_SESS_RECOV;
598 else
599 state = ISCSI_TASK_ABRT_TMF;
600
601 sc->result = err << 16;
602 scsi_set_resid(sc, scsi_bufflen(sc));
603
604 /* regular RX path uses back_lock */
605 spin_lock_bh(&conn->session->back_lock);
606 iscsi_complete_task(task, state);
607 spin_unlock_bh(&conn->session->back_lock);
608}
609
610static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
611 struct iscsi_task *task)
612{
613 struct iscsi_session *session = conn->session;
614 struct iscsi_hdr *hdr = task->hdr;
615 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
616 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
617
618 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
619 return -ENOTCONN;
620
621 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
622 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
623 /*
624 * pre-format CmdSN for outgoing PDU.
625 */
626 nop->cmdsn = cpu_to_be32(session->cmdsn);
627 if (hdr->itt != RESERVED_ITT) {
628 /*
629 * TODO: We always use immediate for normal session pdus.
630 * If we start to send tmfs or nops as non-immediate then
631 * we should start checking the cmdsn numbers for mgmt tasks.
632 *
633 * During discovery sessions iscsid sends TEXT as non immediate,
634 * but we always only send one PDU at a time.
635 */
636 if (conn->c_stage == ISCSI_CONN_STARTED &&
637 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
638 session->queued_cmdsn++;
639 session->cmdsn++;
640 }
641 }
642
643 if (session->tt->init_task && session->tt->init_task(task))
644 return -EIO;
645
646 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
647 session->state = ISCSI_STATE_LOGGING_OUT;
648
649 task->state = ISCSI_TASK_RUNNING;
650 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
651 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
652 hdr->itt, task->data_count);
653 return 0;
654}
655
656static struct iscsi_task *
657__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
658 char *data, uint32_t data_size)
659{
660 struct iscsi_session *session = conn->session;
661 struct iscsi_host *ihost = shost_priv(session->host);
662 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
663 struct iscsi_task *task;
664 itt_t itt;
665
666 if (session->state == ISCSI_STATE_TERMINATE)
667 return NULL;
668
669 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
670 /*
671 * Login and Text are sent serially, in
672 * request-followed-by-response sequence.
673 * Same task can be used. Same ITT must be used.
674 * Note that login_task is preallocated at conn_create().
675 */
676 if (conn->login_task->state != ISCSI_TASK_FREE) {
677 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
678 "progress. Cannot start new task.\n");
679 return NULL;
680 }
681
682 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
683 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);
684 return NULL;
685 }
686
687 task = conn->login_task;
688 } else {
689 if (session->state != ISCSI_STATE_LOGGED_IN)
690 return NULL;
691
692 if (data_size != 0) {
693 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
694 return NULL;
695 }
696
697 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
698 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
699
700 if (!kfifo_out(&session->cmdpool.queue,
701 (void*)&task, sizeof(void*)))
702 return NULL;
703 }
704 /*
705 * released in complete pdu for task we expect a response for, and
706 * released by the lld when it has transmitted the task for
707 * pdus we do not expect a response for.
708 */
709 refcount_set(&task->refcount, 1);
710 task->conn = conn;
711 task->sc = NULL;
712 INIT_LIST_HEAD(&task->running);
713 task->state = ISCSI_TASK_PENDING;
714
715 if (data_size) {
716 memcpy(task->data, data, data_size);
717 task->data_count = data_size;
718 } else
719 task->data_count = 0;
720
721 if (conn->session->tt->alloc_pdu) {
722 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
723 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
724 "pdu for mgmt task.\n");
725 goto free_task;
726 }
727 }
728
729 itt = task->hdr->itt;
730 task->hdr_len = sizeof(struct iscsi_hdr);
731 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
732
733 if (hdr->itt != RESERVED_ITT) {
734 if (session->tt->parse_pdu_itt)
735 task->hdr->itt = itt;
736 else
737 task->hdr->itt = build_itt(task->itt,
738 task->conn->session->age);
739 }
740
741 if (!ihost->workq) {
742 if (iscsi_prep_mgmt_task(conn, task))
743 goto free_task;
744
745 if (session->tt->xmit_task(task))
746 goto free_task;
747 } else {
748 spin_lock_bh(&conn->taskqueuelock);
749 list_add_tail(&task->running, &conn->mgmtqueue);
750 spin_unlock_bh(&conn->taskqueuelock);
751 iscsi_conn_queue_work(conn);
752 }
753
754 return task;
755
756free_task:
757 /* regular RX path uses back_lock */
758 spin_lock(&session->back_lock);
759 __iscsi_put_task(task);
760 spin_unlock(&session->back_lock);
761 return NULL;
762}
763
764int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
765 char *data, uint32_t data_size)
766{
767 struct iscsi_conn *conn = cls_conn->dd_data;
768 struct iscsi_session *session = conn->session;
769 int err = 0;
770
771 spin_lock_bh(&session->frwd_lock);
772 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
773 err = -EPERM;
774 spin_unlock_bh(&session->frwd_lock);
775 return err;
776}
777EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
778
779/**
780 * iscsi_cmd_rsp - SCSI Command Response processing
781 * @conn: iscsi connection
782 * @hdr: iscsi header
783 * @task: scsi command task
784 * @data: cmd data buffer
785 * @datalen: len of buffer
786 *
787 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
788 * then completes the command and task. called under back_lock
789 **/
790static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
791 struct iscsi_task *task, char *data,
792 int datalen)
793{
794 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
795 struct iscsi_session *session = conn->session;
796 struct scsi_cmnd *sc = task->sc;
797
798 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
799 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
800
801 sc->result = (DID_OK << 16) | rhdr->cmd_status;
802
803 if (task->protected) {
804 sector_t sector;
805 u8 ascq;
806
807 /**
808 * Transports that didn't implement check_protection
809 * callback but still published T10-PI support to scsi-mid
810 * deserve this BUG_ON.
811 **/
812 BUG_ON(!session->tt->check_protection);
813
814 ascq = session->tt->check_protection(task, §or);
815 if (ascq) {
816 sc->result = DRIVER_SENSE << 24 |
817 SAM_STAT_CHECK_CONDITION;
818 scsi_build_sense_buffer(1, sc->sense_buffer,
819 ILLEGAL_REQUEST, 0x10, ascq);
820 scsi_set_sense_information(sc->sense_buffer,
821 SCSI_SENSE_BUFFERSIZE,
822 sector);
823 goto out;
824 }
825 }
826
827 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
828 sc->result = DID_ERROR << 16;
829 goto out;
830 }
831
832 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
833 uint16_t senselen;
834
835 if (datalen < 2) {
836invalid_datalen:
837 iscsi_conn_printk(KERN_ERR, conn,
838 "Got CHECK_CONDITION but invalid data "
839 "buffer size of %d\n", datalen);
840 sc->result = DID_BAD_TARGET << 16;
841 goto out;
842 }
843
844 senselen = get_unaligned_be16(data);
845 if (datalen < senselen)
846 goto invalid_datalen;
847
848 memcpy(sc->sense_buffer, data + 2,
849 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
850 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
851 min_t(uint16_t, senselen,
852 SCSI_SENSE_BUFFERSIZE));
853 }
854
855 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
856 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
857 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
858 }
859
860 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
861 ISCSI_FLAG_CMD_OVERFLOW)) {
862 int res_count = be32_to_cpu(rhdr->residual_count);
863
864 if (res_count > 0 &&
865 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
866 res_count <= scsi_bufflen(sc)))
867 /* write side for bidi or uni-io set_resid */
868 scsi_set_resid(sc, res_count);
869 else
870 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
871 }
872out:
873 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
874 sc, sc->result, task->itt);
875 conn->scsirsp_pdus_cnt++;
876 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
877}
878
879/**
880 * iscsi_data_in_rsp - SCSI Data-In Response processing
881 * @conn: iscsi connection
882 * @hdr: iscsi pdu
883 * @task: scsi command task
884 *
885 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received
886 * then completes the command and task. called under back_lock
887 **/
888static void
889iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
890 struct iscsi_task *task)
891{
892 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
893 struct scsi_cmnd *sc = task->sc;
894
895 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
896 return;
897
898 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
899 sc->result = (DID_OK << 16) | rhdr->cmd_status;
900 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
901 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
902 ISCSI_FLAG_DATA_OVERFLOW)) {
903 int res_count = be32_to_cpu(rhdr->residual_count);
904
905 if (res_count > 0 &&
906 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
907 res_count <= sc->sdb.length))
908 scsi_set_resid(sc, res_count);
909 else
910 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
911 }
912
913 ISCSI_DBG_SESSION(conn->session, "data in with status done "
914 "[sc %p res %d itt 0x%x]\n",
915 sc, sc->result, task->itt);
916 conn->scsirsp_pdus_cnt++;
917 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
918}
919
920static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
921{
922 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
923
924 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
925 conn->tmfrsp_pdus_cnt++;
926
927 if (conn->tmf_state != TMF_QUEUED)
928 return;
929
930 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
931 conn->tmf_state = TMF_SUCCESS;
932 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
933 conn->tmf_state = TMF_NOT_FOUND;
934 else
935 conn->tmf_state = TMF_FAILED;
936 wake_up(&conn->ehwait);
937}
938
939static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
940{
941 struct iscsi_nopout hdr;
942 struct iscsi_task *task;
943
944 if (!rhdr && conn->ping_task)
945 return -EINVAL;
946
947 memset(&hdr, 0, sizeof(struct iscsi_nopout));
948 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
949 hdr.flags = ISCSI_FLAG_CMD_FINAL;
950
951 if (rhdr) {
952 hdr.lun = rhdr->lun;
953 hdr.ttt = rhdr->ttt;
954 hdr.itt = RESERVED_ITT;
955 } else
956 hdr.ttt = RESERVED_ITT;
957
958 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
959 if (!task) {
960 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
961 return -EIO;
962 } else if (!rhdr) {
963 /* only track our nops */
964 conn->ping_task = task;
965 conn->last_ping = jiffies;
966 }
967
968 return 0;
969}
970
971/**
972 * iscsi_nop_out_rsp - SCSI NOP Response processing
973 * @task: scsi command task
974 * @nop: the nop structure
975 * @data: where to put the data
976 * @datalen: length of data
977 *
978 * iscsi_nop_out_rsp handles nop response from use or
979 * from user space. called under back_lock
980 **/
981static 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
1001static 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 opcode, rejected_pdu.itt);
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 opcode, rejected_pdu.itt);
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 /* In RX path we are under back lock */
1050 spin_unlock(&conn->session->back_lock);
1051 spin_lock(&conn->session->frwd_lock);
1052 iscsi_send_nopout(conn,
1053 (struct iscsi_nopin*)&rejected_pdu);
1054 spin_unlock(&conn->session->frwd_lock);
1055 spin_lock(&conn->session->back_lock);
1056 } else {
1057 struct iscsi_task *task;
1058 /*
1059 * Our nop as ping got dropped. We know the target
1060 * and transport are ok so just clean up
1061 */
1062 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1063 if (!task) {
1064 iscsi_conn_printk(KERN_ERR, conn,
1065 "Invalid pdu reject. Could "
1066 "not lookup rejected task.\n");
1067 rc = ISCSI_ERR_BAD_ITT;
1068 } else
1069 rc = iscsi_nop_out_rsp(task,
1070 (struct iscsi_nopin*)&rejected_pdu,
1071 NULL, 0);
1072 }
1073 break;
1074 default:
1075 iscsi_conn_printk(KERN_ERR, conn,
1076 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1077 "code 0x%x\n", rejected_pdu.opcode,
1078 rejected_pdu.itt, reject->reason);
1079 break;
1080 }
1081 return rc;
1082}
1083
1084/**
1085 * iscsi_itt_to_task - look up task by itt
1086 * @conn: iscsi connection
1087 * @itt: itt
1088 *
1089 * This should be used for mgmt tasks like login and nops, or if
1090 * the LDD's itt space does not include the session age.
1091 *
1092 * The session back_lock must be held.
1093 */
1094struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1095{
1096 struct iscsi_session *session = conn->session;
1097 int i;
1098
1099 if (itt == RESERVED_ITT)
1100 return NULL;
1101
1102 if (session->tt->parse_pdu_itt)
1103 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1104 else
1105 i = get_itt(itt);
1106 if (i >= session->cmds_max)
1107 return NULL;
1108
1109 return session->cmds[i];
1110}
1111EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1112
1113/**
1114 * __iscsi_complete_pdu - complete pdu
1115 * @conn: iscsi conn
1116 * @hdr: iscsi header
1117 * @data: data buffer
1118 * @datalen: len of data buffer
1119 *
1120 * Completes pdu processing by freeing any resources allocated at
1121 * queuecommand or send generic. session back_lock must be held and verify
1122 * itt must have been called.
1123 */
1124int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1125 char *data, int datalen)
1126{
1127 struct iscsi_session *session = conn->session;
1128 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1129 struct iscsi_task *task;
1130 uint32_t itt;
1131
1132 conn->last_recv = jiffies;
1133 rc = iscsi_verify_itt(conn, hdr->itt);
1134 if (rc)
1135 return rc;
1136
1137 if (hdr->itt != RESERVED_ITT)
1138 itt = get_itt(hdr->itt);
1139 else
1140 itt = ~0U;
1141
1142 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1143 opcode, conn->id, itt, datalen);
1144
1145 if (itt == ~0U) {
1146 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1147
1148 switch(opcode) {
1149 case ISCSI_OP_NOOP_IN:
1150 if (datalen) {
1151 rc = ISCSI_ERR_PROTO;
1152 break;
1153 }
1154
1155 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1156 break;
1157
1158 /* In RX path we are under back lock */
1159 spin_unlock(&session->back_lock);
1160 spin_lock(&session->frwd_lock);
1161 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1162 spin_unlock(&session->frwd_lock);
1163 spin_lock(&session->back_lock);
1164 break;
1165 case ISCSI_OP_REJECT:
1166 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1167 break;
1168 case ISCSI_OP_ASYNC_EVENT:
1169 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1170 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1171 rc = ISCSI_ERR_CONN_FAILED;
1172 break;
1173 default:
1174 rc = ISCSI_ERR_BAD_OPCODE;
1175 break;
1176 }
1177 goto out;
1178 }
1179
1180 switch(opcode) {
1181 case ISCSI_OP_SCSI_CMD_RSP:
1182 case ISCSI_OP_SCSI_DATA_IN:
1183 task = iscsi_itt_to_ctask(conn, hdr->itt);
1184 if (!task)
1185 return ISCSI_ERR_BAD_ITT;
1186 task->last_xfer = jiffies;
1187 break;
1188 case ISCSI_OP_R2T:
1189 /*
1190 * LLD handles R2Ts if they need to.
1191 */
1192 return 0;
1193 case ISCSI_OP_LOGOUT_RSP:
1194 case ISCSI_OP_LOGIN_RSP:
1195 case ISCSI_OP_TEXT_RSP:
1196 case ISCSI_OP_SCSI_TMFUNC_RSP:
1197 case ISCSI_OP_NOOP_IN:
1198 task = iscsi_itt_to_task(conn, hdr->itt);
1199 if (!task)
1200 return ISCSI_ERR_BAD_ITT;
1201 break;
1202 default:
1203 return ISCSI_ERR_BAD_OPCODE;
1204 }
1205
1206 switch(opcode) {
1207 case ISCSI_OP_SCSI_CMD_RSP:
1208 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1209 break;
1210 case ISCSI_OP_SCSI_DATA_IN:
1211 iscsi_data_in_rsp(conn, hdr, task);
1212 break;
1213 case ISCSI_OP_LOGOUT_RSP:
1214 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1215 if (datalen) {
1216 rc = ISCSI_ERR_PROTO;
1217 break;
1218 }
1219 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1220 goto recv_pdu;
1221 case ISCSI_OP_LOGIN_RSP:
1222 case ISCSI_OP_TEXT_RSP:
1223 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1224 /*
1225 * login related PDU's exp_statsn is handled in
1226 * userspace
1227 */
1228 goto recv_pdu;
1229 case ISCSI_OP_SCSI_TMFUNC_RSP:
1230 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1231 if (datalen) {
1232 rc = ISCSI_ERR_PROTO;
1233 break;
1234 }
1235
1236 iscsi_tmf_rsp(conn, hdr);
1237 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1238 break;
1239 case ISCSI_OP_NOOP_IN:
1240 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1241 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1242 rc = ISCSI_ERR_PROTO;
1243 break;
1244 }
1245 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1246
1247 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1248 data, datalen);
1249 break;
1250 default:
1251 rc = ISCSI_ERR_BAD_OPCODE;
1252 break;
1253 }
1254
1255out:
1256 return rc;
1257recv_pdu:
1258 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1259 rc = ISCSI_ERR_CONN_FAILED;
1260 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1261 return rc;
1262}
1263EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1264
1265int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1266 char *data, int datalen)
1267{
1268 int rc;
1269
1270 spin_lock(&conn->session->back_lock);
1271 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1272 spin_unlock(&conn->session->back_lock);
1273 return rc;
1274}
1275EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1276
1277int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1278{
1279 struct iscsi_session *session = conn->session;
1280 int age = 0, i = 0;
1281
1282 if (itt == RESERVED_ITT)
1283 return 0;
1284
1285 if (session->tt->parse_pdu_itt)
1286 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1287 else {
1288 i = get_itt(itt);
1289 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1290 }
1291
1292 if (age != session->age) {
1293 iscsi_conn_printk(KERN_ERR, conn,
1294 "received itt %x expected session age (%x)\n",
1295 (__force u32)itt, session->age);
1296 return ISCSI_ERR_BAD_ITT;
1297 }
1298
1299 if (i >= session->cmds_max) {
1300 iscsi_conn_printk(KERN_ERR, conn,
1301 "received invalid itt index %u (max cmds "
1302 "%u.\n", i, session->cmds_max);
1303 return ISCSI_ERR_BAD_ITT;
1304 }
1305 return 0;
1306}
1307EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1308
1309/**
1310 * iscsi_itt_to_ctask - look up ctask by itt
1311 * @conn: iscsi connection
1312 * @itt: itt
1313 *
1314 * This should be used for cmd tasks.
1315 *
1316 * The session back_lock must be held.
1317 */
1318struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1319{
1320 struct iscsi_task *task;
1321
1322 if (iscsi_verify_itt(conn, itt))
1323 return NULL;
1324
1325 task = iscsi_itt_to_task(conn, itt);
1326 if (!task || !task->sc)
1327 return NULL;
1328
1329 if (task->sc->SCp.phase != conn->session->age) {
1330 iscsi_session_printk(KERN_ERR, conn->session,
1331 "task's session age %d, expected %d\n",
1332 task->sc->SCp.phase, conn->session->age);
1333 return NULL;
1334 }
1335
1336 return task;
1337}
1338EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1339
1340void iscsi_session_failure(struct iscsi_session *session,
1341 enum iscsi_err err)
1342{
1343 struct iscsi_conn *conn;
1344 struct device *dev;
1345
1346 spin_lock_bh(&session->frwd_lock);
1347 conn = session->leadconn;
1348 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1349 spin_unlock_bh(&session->frwd_lock);
1350 return;
1351 }
1352
1353 dev = get_device(&conn->cls_conn->dev);
1354 spin_unlock_bh(&session->frwd_lock);
1355 if (!dev)
1356 return;
1357 /*
1358 * if the host is being removed bypass the connection
1359 * recovery initialization because we are going to kill
1360 * the session.
1361 */
1362 if (err == ISCSI_ERR_INVALID_HOST)
1363 iscsi_conn_error_event(conn->cls_conn, err);
1364 else
1365 iscsi_conn_failure(conn, err);
1366 put_device(dev);
1367}
1368EXPORT_SYMBOL_GPL(iscsi_session_failure);
1369
1370void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1371{
1372 struct iscsi_session *session = conn->session;
1373
1374 spin_lock_bh(&session->frwd_lock);
1375 if (session->state == ISCSI_STATE_FAILED) {
1376 spin_unlock_bh(&session->frwd_lock);
1377 return;
1378 }
1379
1380 if (conn->stop_stage == 0)
1381 session->state = ISCSI_STATE_FAILED;
1382 spin_unlock_bh(&session->frwd_lock);
1383
1384 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1385 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1386 iscsi_conn_error_event(conn->cls_conn, err);
1387}
1388EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1389
1390static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1391{
1392 struct iscsi_session *session = conn->session;
1393
1394 /*
1395 * Check for iSCSI window and take care of CmdSN wrap-around
1396 */
1397 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1398 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1399 "%u MaxCmdSN %u CmdSN %u/%u\n",
1400 session->exp_cmdsn, session->max_cmdsn,
1401 session->cmdsn, session->queued_cmdsn);
1402 return -ENOSPC;
1403 }
1404 return 0;
1405}
1406
1407static int iscsi_xmit_task(struct iscsi_conn *conn)
1408{
1409 struct iscsi_task *task = conn->task;
1410 int rc;
1411
1412 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1413 return -ENODATA;
1414
1415 spin_lock_bh(&conn->session->back_lock);
1416 if (conn->task == NULL) {
1417 spin_unlock_bh(&conn->session->back_lock);
1418 return -ENODATA;
1419 }
1420 __iscsi_get_task(task);
1421 spin_unlock_bh(&conn->session->back_lock);
1422 spin_unlock_bh(&conn->session->frwd_lock);
1423 rc = conn->session->tt->xmit_task(task);
1424 spin_lock_bh(&conn->session->frwd_lock);
1425 if (!rc) {
1426 /* done with this task */
1427 task->last_xfer = jiffies;
1428 conn->task = NULL;
1429 }
1430 /* regular RX path uses back_lock */
1431 spin_lock(&conn->session->back_lock);
1432 __iscsi_put_task(task);
1433 spin_unlock(&conn->session->back_lock);
1434 return rc;
1435}
1436
1437/**
1438 * iscsi_requeue_task - requeue task to run from session workqueue
1439 * @task: task to requeue
1440 *
1441 * LLDs that need to run a task from the session workqueue should call
1442 * this. The session frwd_lock must be held. This should only be called
1443 * by software drivers.
1444 */
1445void iscsi_requeue_task(struct iscsi_task *task)
1446{
1447 struct iscsi_conn *conn = task->conn;
1448
1449 /*
1450 * this may be on the requeue list already if the xmit_task callout
1451 * is handling the r2ts while we are adding new ones
1452 */
1453 spin_lock_bh(&conn->taskqueuelock);
1454 if (list_empty(&task->running))
1455 list_add_tail(&task->running, &conn->requeue);
1456 spin_unlock_bh(&conn->taskqueuelock);
1457 iscsi_conn_queue_work(conn);
1458}
1459EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1460
1461/**
1462 * iscsi_data_xmit - xmit any command into the scheduled connection
1463 * @conn: iscsi connection
1464 *
1465 * Notes:
1466 * The function can return -EAGAIN in which case the caller must
1467 * re-schedule it again later or recover. '0' return code means
1468 * successful xmit.
1469 **/
1470static int iscsi_data_xmit(struct iscsi_conn *conn)
1471{
1472 struct iscsi_task *task;
1473 int rc = 0;
1474
1475 spin_lock_bh(&conn->session->frwd_lock);
1476 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1477 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1478 spin_unlock_bh(&conn->session->frwd_lock);
1479 return -ENODATA;
1480 }
1481
1482 if (conn->task) {
1483 rc = iscsi_xmit_task(conn);
1484 if (rc)
1485 goto done;
1486 }
1487
1488 /*
1489 * process mgmt pdus like nops before commands since we should
1490 * only have one nop-out as a ping from us and targets should not
1491 * overflow us with nop-ins
1492 */
1493 spin_lock_bh(&conn->taskqueuelock);
1494check_mgmt:
1495 while (!list_empty(&conn->mgmtqueue)) {
1496 conn->task = list_entry(conn->mgmtqueue.next,
1497 struct iscsi_task, running);
1498 list_del_init(&conn->task->running);
1499 spin_unlock_bh(&conn->taskqueuelock);
1500 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1501 /* regular RX path uses back_lock */
1502 spin_lock_bh(&conn->session->back_lock);
1503 __iscsi_put_task(conn->task);
1504 spin_unlock_bh(&conn->session->back_lock);
1505 conn->task = NULL;
1506 spin_lock_bh(&conn->taskqueuelock);
1507 continue;
1508 }
1509 rc = iscsi_xmit_task(conn);
1510 if (rc)
1511 goto done;
1512 spin_lock_bh(&conn->taskqueuelock);
1513 }
1514
1515 /* process pending command queue */
1516 while (!list_empty(&conn->cmdqueue)) {
1517 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1518 running);
1519 list_del_init(&conn->task->running);
1520 spin_unlock_bh(&conn->taskqueuelock);
1521 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1522 fail_scsi_task(conn->task, DID_IMM_RETRY);
1523 spin_lock_bh(&conn->taskqueuelock);
1524 continue;
1525 }
1526 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1527 if (rc) {
1528 if (rc == -ENOMEM || rc == -EACCES) {
1529 spin_lock_bh(&conn->taskqueuelock);
1530 list_add_tail(&conn->task->running,
1531 &conn->cmdqueue);
1532 conn->task = NULL;
1533 spin_unlock_bh(&conn->taskqueuelock);
1534 goto done;
1535 } else
1536 fail_scsi_task(conn->task, DID_ABORT);
1537 spin_lock_bh(&conn->taskqueuelock);
1538 continue;
1539 }
1540 rc = iscsi_xmit_task(conn);
1541 if (rc)
1542 goto done;
1543 /*
1544 * we could continuously get new task requests so
1545 * we need to check the mgmt queue for nops that need to
1546 * be sent to aviod starvation
1547 */
1548 spin_lock_bh(&conn->taskqueuelock);
1549 if (!list_empty(&conn->mgmtqueue))
1550 goto check_mgmt;
1551 }
1552
1553 while (!list_empty(&conn->requeue)) {
1554 /*
1555 * we always do fastlogout - conn stop code will clean up.
1556 */
1557 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1558 break;
1559
1560 task = list_entry(conn->requeue.next, struct iscsi_task,
1561 running);
1562 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1563 break;
1564
1565 conn->task = task;
1566 list_del_init(&conn->task->running);
1567 conn->task->state = ISCSI_TASK_RUNNING;
1568 spin_unlock_bh(&conn->taskqueuelock);
1569 rc = iscsi_xmit_task(conn);
1570 if (rc)
1571 goto done;
1572 spin_lock_bh(&conn->taskqueuelock);
1573 if (!list_empty(&conn->mgmtqueue))
1574 goto check_mgmt;
1575 }
1576 spin_unlock_bh(&conn->taskqueuelock);
1577 spin_unlock_bh(&conn->session->frwd_lock);
1578 return -ENODATA;
1579
1580done:
1581 spin_unlock_bh(&conn->session->frwd_lock);
1582 return rc;
1583}
1584
1585static void iscsi_xmitworker(struct work_struct *work)
1586{
1587 struct iscsi_conn *conn =
1588 container_of(work, struct iscsi_conn, xmitwork);
1589 int rc;
1590 /*
1591 * serialize Xmit worker on a per-connection basis.
1592 */
1593 do {
1594 rc = iscsi_data_xmit(conn);
1595 } while (rc >= 0 || rc == -EAGAIN);
1596}
1597
1598static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1599 struct scsi_cmnd *sc)
1600{
1601 struct iscsi_task *task;
1602
1603 if (!kfifo_out(&conn->session->cmdpool.queue,
1604 (void *) &task, sizeof(void *)))
1605 return NULL;
1606
1607 sc->SCp.phase = conn->session->age;
1608 sc->SCp.ptr = (char *) task;
1609
1610 refcount_set(&task->refcount, 1);
1611 task->state = ISCSI_TASK_PENDING;
1612 task->conn = conn;
1613 task->sc = sc;
1614 task->have_checked_conn = false;
1615 task->last_timeout = jiffies;
1616 task->last_xfer = jiffies;
1617 task->protected = false;
1618 INIT_LIST_HEAD(&task->running);
1619 return task;
1620}
1621
1622enum {
1623 FAILURE_BAD_HOST = 1,
1624 FAILURE_SESSION_FAILED,
1625 FAILURE_SESSION_FREED,
1626 FAILURE_WINDOW_CLOSED,
1627 FAILURE_OOM,
1628 FAILURE_SESSION_TERMINATE,
1629 FAILURE_SESSION_IN_RECOVERY,
1630 FAILURE_SESSION_RECOVERY_TIMEOUT,
1631 FAILURE_SESSION_LOGGING_OUT,
1632 FAILURE_SESSION_NOT_READY,
1633};
1634
1635int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1636{
1637 struct iscsi_cls_session *cls_session;
1638 struct iscsi_host *ihost;
1639 int reason = 0;
1640 struct iscsi_session *session;
1641 struct iscsi_conn *conn;
1642 struct iscsi_task *task = NULL;
1643
1644 sc->result = 0;
1645 sc->SCp.ptr = NULL;
1646
1647 ihost = shost_priv(host);
1648
1649 cls_session = starget_to_session(scsi_target(sc->device));
1650 session = cls_session->dd_data;
1651 spin_lock_bh(&session->frwd_lock);
1652
1653 reason = iscsi_session_chkready(cls_session);
1654 if (reason) {
1655 sc->result = reason;
1656 goto fault;
1657 }
1658
1659 if (session->state != ISCSI_STATE_LOGGED_IN) {
1660 /*
1661 * to handle the race between when we set the recovery state
1662 * and block the session we requeue here (commands could
1663 * be entering our queuecommand while a block is starting
1664 * up because the block code is not locked)
1665 */
1666 switch (session->state) {
1667 case ISCSI_STATE_FAILED:
1668 /*
1669 * cmds should fail during shutdown, if the session
1670 * state is bad, allowing completion to happen
1671 */
1672 if (unlikely(system_state != SYSTEM_RUNNING)) {
1673 reason = FAILURE_SESSION_FAILED;
1674 sc->result = DID_NO_CONNECT << 16;
1675 break;
1676 }
1677 fallthrough;
1678 case ISCSI_STATE_IN_RECOVERY:
1679 reason = FAILURE_SESSION_IN_RECOVERY;
1680 sc->result = DID_IMM_RETRY << 16;
1681 break;
1682 case ISCSI_STATE_LOGGING_OUT:
1683 reason = FAILURE_SESSION_LOGGING_OUT;
1684 sc->result = DID_IMM_RETRY << 16;
1685 break;
1686 case ISCSI_STATE_RECOVERY_FAILED:
1687 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1688 sc->result = DID_TRANSPORT_FAILFAST << 16;
1689 break;
1690 case ISCSI_STATE_TERMINATE:
1691 reason = FAILURE_SESSION_TERMINATE;
1692 sc->result = DID_NO_CONNECT << 16;
1693 break;
1694 default:
1695 reason = FAILURE_SESSION_FREED;
1696 sc->result = DID_NO_CONNECT << 16;
1697 }
1698 goto fault;
1699 }
1700
1701 conn = session->leadconn;
1702 if (!conn) {
1703 reason = FAILURE_SESSION_FREED;
1704 sc->result = DID_NO_CONNECT << 16;
1705 goto fault;
1706 }
1707
1708 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1709 reason = FAILURE_SESSION_IN_RECOVERY;
1710 sc->result = DID_REQUEUE << 16;
1711 goto fault;
1712 }
1713
1714 if (iscsi_check_cmdsn_window_closed(conn)) {
1715 reason = FAILURE_WINDOW_CLOSED;
1716 goto reject;
1717 }
1718
1719 task = iscsi_alloc_task(conn, sc);
1720 if (!task) {
1721 reason = FAILURE_OOM;
1722 goto reject;
1723 }
1724
1725 if (!ihost->workq) {
1726 reason = iscsi_prep_scsi_cmd_pdu(task);
1727 if (reason) {
1728 if (reason == -ENOMEM || reason == -EACCES) {
1729 reason = FAILURE_OOM;
1730 goto prepd_reject;
1731 } else {
1732 sc->result = DID_ABORT << 16;
1733 goto prepd_fault;
1734 }
1735 }
1736 if (session->tt->xmit_task(task)) {
1737 session->cmdsn--;
1738 reason = FAILURE_SESSION_NOT_READY;
1739 goto prepd_reject;
1740 }
1741 } else {
1742 spin_lock_bh(&conn->taskqueuelock);
1743 list_add_tail(&task->running, &conn->cmdqueue);
1744 spin_unlock_bh(&conn->taskqueuelock);
1745 iscsi_conn_queue_work(conn);
1746 }
1747
1748 session->queued_cmdsn++;
1749 spin_unlock_bh(&session->frwd_lock);
1750 return 0;
1751
1752prepd_reject:
1753 spin_lock_bh(&session->back_lock);
1754 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1755 spin_unlock_bh(&session->back_lock);
1756reject:
1757 spin_unlock_bh(&session->frwd_lock);
1758 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1759 sc->cmnd[0], reason);
1760 return SCSI_MLQUEUE_TARGET_BUSY;
1761
1762prepd_fault:
1763 spin_lock_bh(&session->back_lock);
1764 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1765 spin_unlock_bh(&session->back_lock);
1766fault:
1767 spin_unlock_bh(&session->frwd_lock);
1768 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1769 sc->cmnd[0], reason);
1770 scsi_set_resid(sc, scsi_bufflen(sc));
1771 sc->scsi_done(sc);
1772 return 0;
1773}
1774EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1775
1776int iscsi_target_alloc(struct scsi_target *starget)
1777{
1778 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1779 struct iscsi_session *session = cls_session->dd_data;
1780
1781 starget->can_queue = session->scsi_cmds_max;
1782 return 0;
1783}
1784EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1785
1786static void iscsi_tmf_timedout(struct timer_list *t)
1787{
1788 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
1789 struct iscsi_session *session = conn->session;
1790
1791 spin_lock(&session->frwd_lock);
1792 if (conn->tmf_state == TMF_QUEUED) {
1793 conn->tmf_state = TMF_TIMEDOUT;
1794 ISCSI_DBG_EH(session, "tmf timedout\n");
1795 /* unblock eh_abort() */
1796 wake_up(&conn->ehwait);
1797 }
1798 spin_unlock(&session->frwd_lock);
1799}
1800
1801static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1802 struct iscsi_tm *hdr, int age,
1803 int timeout)
1804 __must_hold(&session->frwd_lock)
1805{
1806 struct iscsi_session *session = conn->session;
1807 struct iscsi_task *task;
1808
1809 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1810 NULL, 0);
1811 if (!task) {
1812 spin_unlock_bh(&session->frwd_lock);
1813 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1814 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1815 spin_lock_bh(&session->frwd_lock);
1816 return -EPERM;
1817 }
1818 conn->tmfcmd_pdus_cnt++;
1819 conn->tmf_timer.expires = timeout * HZ + jiffies;
1820 add_timer(&conn->tmf_timer);
1821 ISCSI_DBG_EH(session, "tmf set timeout\n");
1822
1823 spin_unlock_bh(&session->frwd_lock);
1824 mutex_unlock(&session->eh_mutex);
1825
1826 /*
1827 * block eh thread until:
1828 *
1829 * 1) tmf response
1830 * 2) tmf timeout
1831 * 3) session is terminated or restarted or userspace has
1832 * given up on recovery
1833 */
1834 wait_event_interruptible(conn->ehwait, age != session->age ||
1835 session->state != ISCSI_STATE_LOGGED_IN ||
1836 conn->tmf_state != TMF_QUEUED);
1837 if (signal_pending(current))
1838 flush_signals(current);
1839 del_timer_sync(&conn->tmf_timer);
1840
1841 mutex_lock(&session->eh_mutex);
1842 spin_lock_bh(&session->frwd_lock);
1843 /* if the session drops it will clean up the task */
1844 if (age != session->age ||
1845 session->state != ISCSI_STATE_LOGGED_IN)
1846 return -ENOTCONN;
1847 return 0;
1848}
1849
1850/*
1851 * Fail commands. session lock held and recv side suspended and xmit
1852 * thread flushed
1853 */
1854static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1855{
1856 struct iscsi_task *task;
1857 int i;
1858
1859 for (i = 0; i < conn->session->cmds_max; i++) {
1860 task = conn->session->cmds[i];
1861 if (!task->sc || task->state == ISCSI_TASK_FREE)
1862 continue;
1863
1864 if (lun != -1 && lun != task->sc->device->lun)
1865 continue;
1866
1867 ISCSI_DBG_SESSION(conn->session,
1868 "failing sc %p itt 0x%x state %d\n",
1869 task->sc, task->itt, task->state);
1870 fail_scsi_task(task, error);
1871 }
1872}
1873
1874/**
1875 * iscsi_suspend_queue - suspend iscsi_queuecommand
1876 * @conn: iscsi conn to stop queueing IO on
1877 *
1878 * This grabs the session frwd_lock to make sure no one is in
1879 * xmit_task/queuecommand, and then sets suspend to prevent
1880 * new commands from being queued. This only needs to be called
1881 * by offload drivers that need to sync a path like ep disconnect
1882 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1883 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1884 */
1885void iscsi_suspend_queue(struct iscsi_conn *conn)
1886{
1887 spin_lock_bh(&conn->session->frwd_lock);
1888 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1889 spin_unlock_bh(&conn->session->frwd_lock);
1890}
1891EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1892
1893/**
1894 * iscsi_suspend_tx - suspend iscsi_data_xmit
1895 * @conn: iscsi conn tp stop processing IO on.
1896 *
1897 * This function sets the suspend bit to prevent iscsi_data_xmit
1898 * from sending new IO, and if work is queued on the xmit thread
1899 * it will wait for it to be completed.
1900 */
1901void iscsi_suspend_tx(struct iscsi_conn *conn)
1902{
1903 struct Scsi_Host *shost = conn->session->host;
1904 struct iscsi_host *ihost = shost_priv(shost);
1905
1906 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1907 if (ihost->workq)
1908 flush_workqueue(ihost->workq);
1909}
1910EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1911
1912static void iscsi_start_tx(struct iscsi_conn *conn)
1913{
1914 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1915 iscsi_conn_queue_work(conn);
1916}
1917
1918/*
1919 * We want to make sure a ping is in flight. It has timed out.
1920 * And we are not busy processing a pdu that is making
1921 * progress but got started before the ping and is taking a while
1922 * to complete so the ping is just stuck behind it in a queue.
1923 */
1924static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1925{
1926 if (conn->ping_task &&
1927 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1928 (conn->ping_timeout * HZ), jiffies))
1929 return 1;
1930 else
1931 return 0;
1932}
1933
1934enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1935{
1936 enum blk_eh_timer_return rc = BLK_EH_DONE;
1937 struct iscsi_task *task = NULL, *running_task;
1938 struct iscsi_cls_session *cls_session;
1939 struct iscsi_session *session;
1940 struct iscsi_conn *conn;
1941 int i;
1942
1943 cls_session = starget_to_session(scsi_target(sc->device));
1944 session = cls_session->dd_data;
1945
1946 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1947
1948 spin_lock_bh(&session->frwd_lock);
1949 task = (struct iscsi_task *)sc->SCp.ptr;
1950 if (!task) {
1951 /*
1952 * Raced with completion. Blk layer has taken ownership
1953 * so let timeout code complete it now.
1954 */
1955 rc = BLK_EH_DONE;
1956 goto done;
1957 }
1958
1959 if (session->state != ISCSI_STATE_LOGGED_IN) {
1960 /*
1961 * During shutdown, if session is prematurely disconnected,
1962 * recovery won't happen and there will be hung cmds. Not
1963 * handling cmds would trigger EH, also bad in this case.
1964 * Instead, handle cmd, allow completion to happen and let
1965 * upper layer to deal with the result.
1966 */
1967 if (unlikely(system_state != SYSTEM_RUNNING)) {
1968 sc->result = DID_NO_CONNECT << 16;
1969 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
1970 rc = BLK_EH_DONE;
1971 goto done;
1972 }
1973 /*
1974 * We are probably in the middle of iscsi recovery so let
1975 * that complete and handle the error.
1976 */
1977 rc = BLK_EH_RESET_TIMER;
1978 goto done;
1979 }
1980
1981 conn = session->leadconn;
1982 if (!conn) {
1983 /* In the middle of shuting down */
1984 rc = BLK_EH_RESET_TIMER;
1985 goto done;
1986 }
1987
1988 /*
1989 * If we have sent (at least queued to the network layer) a pdu or
1990 * recvd one for the task since the last timeout ask for
1991 * more time. If on the next timeout we have not made progress
1992 * we can check if it is the task or connection when we send the
1993 * nop as a ping.
1994 */
1995 if (time_after(task->last_xfer, task->last_timeout)) {
1996 ISCSI_DBG_EH(session, "Command making progress. Asking "
1997 "scsi-ml for more time to complete. "
1998 "Last data xfer at %lu. Last timeout was at "
1999 "%lu\n.", task->last_xfer, task->last_timeout);
2000 task->have_checked_conn = false;
2001 rc = BLK_EH_RESET_TIMER;
2002 goto done;
2003 }
2004
2005 if (!conn->recv_timeout && !conn->ping_timeout)
2006 goto done;
2007 /*
2008 * if the ping timedout then we are in the middle of cleaning up
2009 * and can let the iscsi eh handle it
2010 */
2011 if (iscsi_has_ping_timed_out(conn)) {
2012 rc = BLK_EH_RESET_TIMER;
2013 goto done;
2014 }
2015
2016 for (i = 0; i < conn->session->cmds_max; i++) {
2017 running_task = conn->session->cmds[i];
2018 if (!running_task->sc || running_task == task ||
2019 running_task->state != ISCSI_TASK_RUNNING)
2020 continue;
2021
2022 /*
2023 * Only check if cmds started before this one have made
2024 * progress, or this could never fail
2025 */
2026 if (time_after(running_task->sc->jiffies_at_alloc,
2027 task->sc->jiffies_at_alloc))
2028 continue;
2029
2030 if (time_after(running_task->last_xfer, task->last_timeout)) {
2031 /*
2032 * This task has not made progress, but a task
2033 * started before us has transferred data since
2034 * we started/last-checked. We could be queueing
2035 * too many tasks or the LU is bad.
2036 *
2037 * If the device is bad the cmds ahead of us on
2038 * other devs will complete, and this loop will
2039 * eventually fail starting the scsi eh.
2040 */
2041 ISCSI_DBG_EH(session, "Command has not made progress "
2042 "but commands ahead of it have. "
2043 "Asking scsi-ml for more time to "
2044 "complete. Our last xfer vs running task "
2045 "last xfer %lu/%lu. Last check %lu.\n",
2046 task->last_xfer, running_task->last_xfer,
2047 task->last_timeout);
2048 rc = BLK_EH_RESET_TIMER;
2049 goto done;
2050 }
2051 }
2052
2053 /* Assumes nop timeout is shorter than scsi cmd timeout */
2054 if (task->have_checked_conn)
2055 goto done;
2056
2057 /*
2058 * Checking the transport already or nop from a cmd timeout still
2059 * running
2060 */
2061 if (conn->ping_task) {
2062 task->have_checked_conn = true;
2063 rc = BLK_EH_RESET_TIMER;
2064 goto done;
2065 }
2066
2067 /* Make sure there is a transport check done */
2068 iscsi_send_nopout(conn, NULL);
2069 task->have_checked_conn = true;
2070 rc = BLK_EH_RESET_TIMER;
2071
2072done:
2073 if (task)
2074 task->last_timeout = jiffies;
2075 spin_unlock_bh(&session->frwd_lock);
2076 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2077 "timer reset" : "shutdown or nh");
2078 return rc;
2079}
2080EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2081
2082static void iscsi_check_transport_timeouts(struct timer_list *t)
2083{
2084 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
2085 struct iscsi_session *session = conn->session;
2086 unsigned long recv_timeout, next_timeout = 0, last_recv;
2087
2088 spin_lock(&session->frwd_lock);
2089 if (session->state != ISCSI_STATE_LOGGED_IN)
2090 goto done;
2091
2092 recv_timeout = conn->recv_timeout;
2093 if (!recv_timeout)
2094 goto done;
2095
2096 recv_timeout *= HZ;
2097 last_recv = conn->last_recv;
2098
2099 if (iscsi_has_ping_timed_out(conn)) {
2100 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2101 "expired, recv timeout %d, last rx %lu, "
2102 "last ping %lu, now %lu\n",
2103 conn->ping_timeout, conn->recv_timeout,
2104 last_recv, conn->last_ping, jiffies);
2105 spin_unlock(&session->frwd_lock);
2106 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2107 return;
2108 }
2109
2110 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2111 /* send a ping to try to provoke some traffic */
2112 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2113 if (iscsi_send_nopout(conn, NULL))
2114 next_timeout = jiffies + (1 * HZ);
2115 else
2116 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2117 } else
2118 next_timeout = last_recv + recv_timeout;
2119
2120 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2121 mod_timer(&conn->transport_timer, next_timeout);
2122done:
2123 spin_unlock(&session->frwd_lock);
2124}
2125
2126static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2127 struct iscsi_tm *hdr)
2128{
2129 memset(hdr, 0, sizeof(*hdr));
2130 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2131 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2132 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2133 hdr->lun = task->lun;
2134 hdr->rtt = task->hdr_itt;
2135 hdr->refcmdsn = task->cmdsn;
2136}
2137
2138int iscsi_eh_abort(struct scsi_cmnd *sc)
2139{
2140 struct iscsi_cls_session *cls_session;
2141 struct iscsi_session *session;
2142 struct iscsi_conn *conn;
2143 struct iscsi_task *task;
2144 struct iscsi_tm *hdr;
2145 int age;
2146
2147 cls_session = starget_to_session(scsi_target(sc->device));
2148 session = cls_session->dd_data;
2149
2150 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2151
2152 mutex_lock(&session->eh_mutex);
2153 spin_lock_bh(&session->frwd_lock);
2154 /*
2155 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2156 * got the command.
2157 */
2158 if (!sc->SCp.ptr) {
2159 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2160 "it completed.\n");
2161 spin_unlock_bh(&session->frwd_lock);
2162 mutex_unlock(&session->eh_mutex);
2163 return SUCCESS;
2164 }
2165
2166 /*
2167 * If we are not logged in or we have started a new session
2168 * then let the host reset code handle this
2169 */
2170 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2171 sc->SCp.phase != session->age) {
2172 spin_unlock_bh(&session->frwd_lock);
2173 mutex_unlock(&session->eh_mutex);
2174 ISCSI_DBG_EH(session, "failing abort due to dropped "
2175 "session.\n");
2176 return FAILED;
2177 }
2178
2179 conn = session->leadconn;
2180 conn->eh_abort_cnt++;
2181 age = session->age;
2182
2183 task = (struct iscsi_task *)sc->SCp.ptr;
2184 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2185 sc, task->itt);
2186
2187 /* task completed before time out */
2188 if (!task->sc) {
2189 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2190 goto success;
2191 }
2192
2193 if (task->state == ISCSI_TASK_PENDING) {
2194 fail_scsi_task(task, DID_ABORT);
2195 goto success;
2196 }
2197
2198 /* only have one tmf outstanding at a time */
2199 if (conn->tmf_state != TMF_INITIAL)
2200 goto failed;
2201 conn->tmf_state = TMF_QUEUED;
2202
2203 hdr = &conn->tmhdr;
2204 iscsi_prep_abort_task_pdu(task, hdr);
2205
2206 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2207 goto failed;
2208
2209 switch (conn->tmf_state) {
2210 case TMF_SUCCESS:
2211 spin_unlock_bh(&session->frwd_lock);
2212 /*
2213 * stop tx side incase the target had sent a abort rsp but
2214 * the initiator was still writing out data.
2215 */
2216 iscsi_suspend_tx(conn);
2217 /*
2218 * we do not stop the recv side because targets have been
2219 * good and have never sent us a successful tmf response
2220 * then sent more data for the cmd.
2221 */
2222 spin_lock_bh(&session->frwd_lock);
2223 fail_scsi_task(task, DID_ABORT);
2224 conn->tmf_state = TMF_INITIAL;
2225 memset(hdr, 0, sizeof(*hdr));
2226 spin_unlock_bh(&session->frwd_lock);
2227 iscsi_start_tx(conn);
2228 goto success_unlocked;
2229 case TMF_TIMEDOUT:
2230 spin_unlock_bh(&session->frwd_lock);
2231 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2232 goto failed_unlocked;
2233 case TMF_NOT_FOUND:
2234 if (!sc->SCp.ptr) {
2235 conn->tmf_state = TMF_INITIAL;
2236 memset(hdr, 0, sizeof(*hdr));
2237 /* task completed before tmf abort response */
2238 ISCSI_DBG_EH(session, "sc completed while abort in "
2239 "progress\n");
2240 goto success;
2241 }
2242 fallthrough;
2243 default:
2244 conn->tmf_state = TMF_INITIAL;
2245 goto failed;
2246 }
2247
2248success:
2249 spin_unlock_bh(&session->frwd_lock);
2250success_unlocked:
2251 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2252 sc, task->itt);
2253 mutex_unlock(&session->eh_mutex);
2254 return SUCCESS;
2255
2256failed:
2257 spin_unlock_bh(&session->frwd_lock);
2258failed_unlocked:
2259 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2260 task ? task->itt : 0);
2261 mutex_unlock(&session->eh_mutex);
2262 return FAILED;
2263}
2264EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2265
2266static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2267{
2268 memset(hdr, 0, sizeof(*hdr));
2269 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2270 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2271 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2272 int_to_scsilun(sc->device->lun, &hdr->lun);
2273 hdr->rtt = RESERVED_ITT;
2274}
2275
2276int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2277{
2278 struct iscsi_cls_session *cls_session;
2279 struct iscsi_session *session;
2280 struct iscsi_conn *conn;
2281 struct iscsi_tm *hdr;
2282 int rc = FAILED;
2283
2284 cls_session = starget_to_session(scsi_target(sc->device));
2285 session = cls_session->dd_data;
2286
2287 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2288 sc->device->lun);
2289
2290 mutex_lock(&session->eh_mutex);
2291 spin_lock_bh(&session->frwd_lock);
2292 /*
2293 * Just check if we are not logged in. We cannot check for
2294 * the phase because the reset could come from a ioctl.
2295 */
2296 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2297 goto unlock;
2298 conn = session->leadconn;
2299
2300 /* only have one tmf outstanding at a time */
2301 if (conn->tmf_state != TMF_INITIAL)
2302 goto unlock;
2303 conn->tmf_state = TMF_QUEUED;
2304
2305 hdr = &conn->tmhdr;
2306 iscsi_prep_lun_reset_pdu(sc, hdr);
2307
2308 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2309 session->lu_reset_timeout)) {
2310 rc = FAILED;
2311 goto unlock;
2312 }
2313
2314 switch (conn->tmf_state) {
2315 case TMF_SUCCESS:
2316 break;
2317 case TMF_TIMEDOUT:
2318 spin_unlock_bh(&session->frwd_lock);
2319 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2320 goto done;
2321 default:
2322 conn->tmf_state = TMF_INITIAL;
2323 goto unlock;
2324 }
2325
2326 rc = SUCCESS;
2327 spin_unlock_bh(&session->frwd_lock);
2328
2329 iscsi_suspend_tx(conn);
2330
2331 spin_lock_bh(&session->frwd_lock);
2332 memset(hdr, 0, sizeof(*hdr));
2333 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2334 conn->tmf_state = TMF_INITIAL;
2335 spin_unlock_bh(&session->frwd_lock);
2336
2337 iscsi_start_tx(conn);
2338 goto done;
2339
2340unlock:
2341 spin_unlock_bh(&session->frwd_lock);
2342done:
2343 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2344 rc == SUCCESS ? "SUCCESS" : "FAILED");
2345 mutex_unlock(&session->eh_mutex);
2346 return rc;
2347}
2348EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2349
2350void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2351{
2352 struct iscsi_session *session = cls_session->dd_data;
2353
2354 spin_lock_bh(&session->frwd_lock);
2355 if (session->state != ISCSI_STATE_LOGGED_IN) {
2356 session->state = ISCSI_STATE_RECOVERY_FAILED;
2357 if (session->leadconn)
2358 wake_up(&session->leadconn->ehwait);
2359 }
2360 spin_unlock_bh(&session->frwd_lock);
2361}
2362EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2363
2364/**
2365 * iscsi_eh_session_reset - drop session and attempt relogin
2366 * @sc: scsi command
2367 *
2368 * This function will wait for a relogin, session termination from
2369 * userspace, or a recovery/replacement timeout.
2370 */
2371int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2372{
2373 struct iscsi_cls_session *cls_session;
2374 struct iscsi_session *session;
2375 struct iscsi_conn *conn;
2376
2377 cls_session = starget_to_session(scsi_target(sc->device));
2378 session = cls_session->dd_data;
2379 conn = session->leadconn;
2380
2381 mutex_lock(&session->eh_mutex);
2382 spin_lock_bh(&session->frwd_lock);
2383 if (session->state == ISCSI_STATE_TERMINATE) {
2384failed:
2385 ISCSI_DBG_EH(session,
2386 "failing session reset: Could not log back into "
2387 "%s [age %d]\n", session->targetname,
2388 session->age);
2389 spin_unlock_bh(&session->frwd_lock);
2390 mutex_unlock(&session->eh_mutex);
2391 return FAILED;
2392 }
2393
2394 spin_unlock_bh(&session->frwd_lock);
2395 mutex_unlock(&session->eh_mutex);
2396 /*
2397 * we drop the lock here but the leadconn cannot be destoyed while
2398 * we are in the scsi eh
2399 */
2400 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2401
2402 ISCSI_DBG_EH(session, "wait for relogin\n");
2403 wait_event_interruptible(conn->ehwait,
2404 session->state == ISCSI_STATE_TERMINATE ||
2405 session->state == ISCSI_STATE_LOGGED_IN ||
2406 session->state == ISCSI_STATE_RECOVERY_FAILED);
2407 if (signal_pending(current))
2408 flush_signals(current);
2409
2410 mutex_lock(&session->eh_mutex);
2411 spin_lock_bh(&session->frwd_lock);
2412 if (session->state == ISCSI_STATE_LOGGED_IN) {
2413 ISCSI_DBG_EH(session,
2414 "session reset succeeded for %s,%s\n",
2415 session->targetname, conn->persistent_address);
2416 } else
2417 goto failed;
2418 spin_unlock_bh(&session->frwd_lock);
2419 mutex_unlock(&session->eh_mutex);
2420 return SUCCESS;
2421}
2422EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2423
2424static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2425{
2426 memset(hdr, 0, sizeof(*hdr));
2427 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2428 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2429 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2430 hdr->rtt = RESERVED_ITT;
2431}
2432
2433/**
2434 * iscsi_eh_target_reset - reset target
2435 * @sc: scsi command
2436 *
2437 * This will attempt to send a warm target reset.
2438 */
2439static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2440{
2441 struct iscsi_cls_session *cls_session;
2442 struct iscsi_session *session;
2443 struct iscsi_conn *conn;
2444 struct iscsi_tm *hdr;
2445 int rc = FAILED;
2446
2447 cls_session = starget_to_session(scsi_target(sc->device));
2448 session = cls_session->dd_data;
2449
2450 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2451 session->targetname);
2452
2453 mutex_lock(&session->eh_mutex);
2454 spin_lock_bh(&session->frwd_lock);
2455 /*
2456 * Just check if we are not logged in. We cannot check for
2457 * the phase because the reset could come from a ioctl.
2458 */
2459 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2460 goto unlock;
2461 conn = session->leadconn;
2462
2463 /* only have one tmf outstanding at a time */
2464 if (conn->tmf_state != TMF_INITIAL)
2465 goto unlock;
2466 conn->tmf_state = TMF_QUEUED;
2467
2468 hdr = &conn->tmhdr;
2469 iscsi_prep_tgt_reset_pdu(sc, hdr);
2470
2471 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2472 session->tgt_reset_timeout)) {
2473 rc = FAILED;
2474 goto unlock;
2475 }
2476
2477 switch (conn->tmf_state) {
2478 case TMF_SUCCESS:
2479 break;
2480 case TMF_TIMEDOUT:
2481 spin_unlock_bh(&session->frwd_lock);
2482 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2483 goto done;
2484 default:
2485 conn->tmf_state = TMF_INITIAL;
2486 goto unlock;
2487 }
2488
2489 rc = SUCCESS;
2490 spin_unlock_bh(&session->frwd_lock);
2491
2492 iscsi_suspend_tx(conn);
2493
2494 spin_lock_bh(&session->frwd_lock);
2495 memset(hdr, 0, sizeof(*hdr));
2496 fail_scsi_tasks(conn, -1, DID_ERROR);
2497 conn->tmf_state = TMF_INITIAL;
2498 spin_unlock_bh(&session->frwd_lock);
2499
2500 iscsi_start_tx(conn);
2501 goto done;
2502
2503unlock:
2504 spin_unlock_bh(&session->frwd_lock);
2505done:
2506 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2507 rc == SUCCESS ? "SUCCESS" : "FAILED");
2508 mutex_unlock(&session->eh_mutex);
2509 return rc;
2510}
2511
2512/**
2513 * iscsi_eh_recover_target - reset target and possibly the session
2514 * @sc: scsi command
2515 *
2516 * This will attempt to send a warm target reset. If that fails,
2517 * we will escalate to ERL0 session recovery.
2518 */
2519int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2520{
2521 int rc;
2522
2523 rc = iscsi_eh_target_reset(sc);
2524 if (rc == FAILED)
2525 rc = iscsi_eh_session_reset(sc);
2526 return rc;
2527}
2528EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2529
2530/*
2531 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2532 * should be accessed via kfifo_{get,put} on q->queue.
2533 * Optionally, the caller can obtain the array of object pointers
2534 * by passing in a non-NULL @items pointer
2535 */
2536int
2537iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2538{
2539 int i, num_arrays = 1;
2540
2541 memset(q, 0, sizeof(*q));
2542
2543 q->max = max;
2544
2545 /* If the user passed an items pointer, he wants a copy of
2546 * the array. */
2547 if (items)
2548 num_arrays++;
2549 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
2550 if (q->pool == NULL)
2551 return -ENOMEM;
2552
2553 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2554
2555 for (i = 0; i < max; i++) {
2556 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2557 if (q->pool[i] == NULL) {
2558 q->max = i;
2559 goto enomem;
2560 }
2561 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2562 }
2563
2564 if (items) {
2565 *items = q->pool + max;
2566 memcpy(*items, q->pool, max * sizeof(void *));
2567 }
2568
2569 return 0;
2570
2571enomem:
2572 iscsi_pool_free(q);
2573 return -ENOMEM;
2574}
2575EXPORT_SYMBOL_GPL(iscsi_pool_init);
2576
2577void iscsi_pool_free(struct iscsi_pool *q)
2578{
2579 int i;
2580
2581 for (i = 0; i < q->max; i++)
2582 kfree(q->pool[i]);
2583 kvfree(q->pool);
2584}
2585EXPORT_SYMBOL_GPL(iscsi_pool_free);
2586
2587/**
2588 * iscsi_host_add - add host to system
2589 * @shost: scsi host
2590 * @pdev: parent device
2591 *
2592 * This should be called by partial offload and software iscsi drivers
2593 * to add a host to the system.
2594 */
2595int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2596{
2597 if (!shost->can_queue)
2598 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2599
2600 if (!shost->cmd_per_lun)
2601 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2602
2603 return scsi_add_host(shost, pdev);
2604}
2605EXPORT_SYMBOL_GPL(iscsi_host_add);
2606
2607/**
2608 * iscsi_host_alloc - allocate a host and driver data
2609 * @sht: scsi host template
2610 * @dd_data_size: driver host data size
2611 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2612 *
2613 * This should be called by partial offload and software iscsi drivers.
2614 * To access the driver specific memory use the iscsi_host_priv() macro.
2615 */
2616struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2617 int dd_data_size, bool xmit_can_sleep)
2618{
2619 struct Scsi_Host *shost;
2620 struct iscsi_host *ihost;
2621
2622 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2623 if (!shost)
2624 return NULL;
2625 ihost = shost_priv(shost);
2626
2627 if (xmit_can_sleep) {
2628 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2629 "iscsi_q_%d", shost->host_no);
2630 ihost->workq = alloc_workqueue("%s",
2631 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
2632 1, ihost->workq_name);
2633 if (!ihost->workq)
2634 goto free_host;
2635 }
2636
2637 spin_lock_init(&ihost->lock);
2638 ihost->state = ISCSI_HOST_SETUP;
2639 ihost->num_sessions = 0;
2640 init_waitqueue_head(&ihost->session_removal_wq);
2641 return shost;
2642
2643free_host:
2644 scsi_host_put(shost);
2645 return NULL;
2646}
2647EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2648
2649static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2650{
2651 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2652}
2653
2654/**
2655 * iscsi_host_remove - remove host and sessions
2656 * @shost: scsi host
2657 *
2658 * If there are any sessions left, this will initiate the removal and wait
2659 * for the completion.
2660 */
2661void iscsi_host_remove(struct Scsi_Host *shost)
2662{
2663 struct iscsi_host *ihost = shost_priv(shost);
2664 unsigned long flags;
2665
2666 spin_lock_irqsave(&ihost->lock, flags);
2667 ihost->state = ISCSI_HOST_REMOVED;
2668 spin_unlock_irqrestore(&ihost->lock, flags);
2669
2670 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2671 wait_event_interruptible(ihost->session_removal_wq,
2672 ihost->num_sessions == 0);
2673 if (signal_pending(current))
2674 flush_signals(current);
2675
2676 scsi_remove_host(shost);
2677 if (ihost->workq)
2678 destroy_workqueue(ihost->workq);
2679}
2680EXPORT_SYMBOL_GPL(iscsi_host_remove);
2681
2682void iscsi_host_free(struct Scsi_Host *shost)
2683{
2684 struct iscsi_host *ihost = shost_priv(shost);
2685
2686 kfree(ihost->netdev);
2687 kfree(ihost->hwaddress);
2688 kfree(ihost->initiatorname);
2689 scsi_host_put(shost);
2690}
2691EXPORT_SYMBOL_GPL(iscsi_host_free);
2692
2693static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2694{
2695 struct iscsi_host *ihost = shost_priv(shost);
2696 unsigned long flags;
2697
2698 shost = scsi_host_get(shost);
2699 if (!shost) {
2700 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2701 "of session teardown event because host already "
2702 "removed.\n");
2703 return;
2704 }
2705
2706 spin_lock_irqsave(&ihost->lock, flags);
2707 ihost->num_sessions--;
2708 if (ihost->num_sessions == 0)
2709 wake_up(&ihost->session_removal_wq);
2710 spin_unlock_irqrestore(&ihost->lock, flags);
2711 scsi_host_put(shost);
2712}
2713
2714/**
2715 * iscsi_session_setup - create iscsi cls session and host and session
2716 * @iscsit: iscsi transport template
2717 * @shost: scsi host
2718 * @cmds_max: session can queue
2719 * @dd_size: private driver data size, added to session allocation size
2720 * @cmd_task_size: LLD task private data size
2721 * @initial_cmdsn: initial CmdSN
2722 * @id: target ID to add to this session
2723 *
2724 * This can be used by software iscsi_transports that allocate
2725 * a session per scsi host.
2726 *
2727 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2728 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2729 * for nop handling and login/logout requests.
2730 */
2731struct iscsi_cls_session *
2732iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2733 uint16_t cmds_max, int dd_size, int cmd_task_size,
2734 uint32_t initial_cmdsn, unsigned int id)
2735{
2736 struct iscsi_host *ihost = shost_priv(shost);
2737 struct iscsi_session *session;
2738 struct iscsi_cls_session *cls_session;
2739 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2740 unsigned long flags;
2741
2742 spin_lock_irqsave(&ihost->lock, flags);
2743 if (ihost->state == ISCSI_HOST_REMOVED) {
2744 spin_unlock_irqrestore(&ihost->lock, flags);
2745 return NULL;
2746 }
2747 ihost->num_sessions++;
2748 spin_unlock_irqrestore(&ihost->lock, flags);
2749
2750 if (!total_cmds)
2751 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2752 /*
2753 * The iscsi layer needs some tasks for nop handling and tmfs,
2754 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2755 * + 1 command for scsi IO.
2756 */
2757 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2758 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2759 "must be a power of two that is at least %d.\n",
2760 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2761 goto dec_session_count;
2762 }
2763
2764 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2765 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2766 "must be a power of 2 less than or equal to %d.\n",
2767 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2768 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2769 }
2770
2771 if (!is_power_of_2(total_cmds)) {
2772 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2773 "must be a power of 2.\n", total_cmds);
2774 total_cmds = rounddown_pow_of_two(total_cmds);
2775 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2776 goto dec_session_count;
2777 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2778 total_cmds);
2779 }
2780 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2781
2782 cls_session = iscsi_alloc_session(shost, iscsit,
2783 sizeof(struct iscsi_session) +
2784 dd_size);
2785 if (!cls_session)
2786 goto dec_session_count;
2787 session = cls_session->dd_data;
2788 session->cls_session = cls_session;
2789 session->host = shost;
2790 session->state = ISCSI_STATE_FREE;
2791 session->fast_abort = 1;
2792 session->tgt_reset_timeout = 30;
2793 session->lu_reset_timeout = 15;
2794 session->abort_timeout = 10;
2795 session->scsi_cmds_max = scsi_cmds;
2796 session->cmds_max = total_cmds;
2797 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2798 session->exp_cmdsn = initial_cmdsn + 1;
2799 session->max_cmdsn = initial_cmdsn + 1;
2800 session->max_r2t = 1;
2801 session->tt = iscsit;
2802 session->dd_data = cls_session->dd_data + sizeof(*session);
2803
2804 mutex_init(&session->eh_mutex);
2805 spin_lock_init(&session->frwd_lock);
2806 spin_lock_init(&session->back_lock);
2807
2808 /* initialize SCSI PDU commands pool */
2809 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2810 (void***)&session->cmds,
2811 cmd_task_size + sizeof(struct iscsi_task)))
2812 goto cmdpool_alloc_fail;
2813
2814 /* pre-format cmds pool with ITT */
2815 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2816 struct iscsi_task *task = session->cmds[cmd_i];
2817
2818 if (cmd_task_size)
2819 task->dd_data = &task[1];
2820 task->itt = cmd_i;
2821 task->state = ISCSI_TASK_FREE;
2822 INIT_LIST_HEAD(&task->running);
2823 }
2824
2825 if (!try_module_get(iscsit->owner))
2826 goto module_get_fail;
2827
2828 if (iscsi_add_session(cls_session, id))
2829 goto cls_session_fail;
2830
2831 return cls_session;
2832
2833cls_session_fail:
2834 module_put(iscsit->owner);
2835module_get_fail:
2836 iscsi_pool_free(&session->cmdpool);
2837cmdpool_alloc_fail:
2838 iscsi_free_session(cls_session);
2839dec_session_count:
2840 iscsi_host_dec_session_cnt(shost);
2841 return NULL;
2842}
2843EXPORT_SYMBOL_GPL(iscsi_session_setup);
2844
2845/**
2846 * iscsi_session_teardown - destroy session, host, and cls_session
2847 * @cls_session: iscsi session
2848 */
2849void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2850{
2851 struct iscsi_session *session = cls_session->dd_data;
2852 struct module *owner = cls_session->transport->owner;
2853 struct Scsi_Host *shost = session->host;
2854
2855 iscsi_pool_free(&session->cmdpool);
2856
2857 iscsi_remove_session(cls_session);
2858
2859 kfree(session->password);
2860 kfree(session->password_in);
2861 kfree(session->username);
2862 kfree(session->username_in);
2863 kfree(session->targetname);
2864 kfree(session->targetalias);
2865 kfree(session->initiatorname);
2866 kfree(session->boot_root);
2867 kfree(session->boot_nic);
2868 kfree(session->boot_target);
2869 kfree(session->ifacename);
2870 kfree(session->portal_type);
2871 kfree(session->discovery_parent_type);
2872
2873 iscsi_free_session(cls_session);
2874
2875 iscsi_host_dec_session_cnt(shost);
2876 module_put(owner);
2877}
2878EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2879
2880/**
2881 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2882 * @cls_session: iscsi_cls_session
2883 * @dd_size: private driver data size
2884 * @conn_idx: cid
2885 */
2886struct iscsi_cls_conn *
2887iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2888 uint32_t conn_idx)
2889{
2890 struct iscsi_session *session = cls_session->dd_data;
2891 struct iscsi_conn *conn;
2892 struct iscsi_cls_conn *cls_conn;
2893 char *data;
2894
2895 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2896 conn_idx);
2897 if (!cls_conn)
2898 return NULL;
2899 conn = cls_conn->dd_data;
2900 memset(conn, 0, sizeof(*conn) + dd_size);
2901
2902 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2903 conn->session = session;
2904 conn->cls_conn = cls_conn;
2905 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2906 conn->id = conn_idx;
2907 conn->exp_statsn = 0;
2908 conn->tmf_state = TMF_INITIAL;
2909
2910 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
2911
2912 INIT_LIST_HEAD(&conn->mgmtqueue);
2913 INIT_LIST_HEAD(&conn->cmdqueue);
2914 INIT_LIST_HEAD(&conn->requeue);
2915 spin_lock_init(&conn->taskqueuelock);
2916 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2917
2918 /* allocate login_task used for the login/text sequences */
2919 spin_lock_bh(&session->frwd_lock);
2920 if (!kfifo_out(&session->cmdpool.queue,
2921 (void*)&conn->login_task,
2922 sizeof(void*))) {
2923 spin_unlock_bh(&session->frwd_lock);
2924 goto login_task_alloc_fail;
2925 }
2926 spin_unlock_bh(&session->frwd_lock);
2927
2928 data = (char *) __get_free_pages(GFP_KERNEL,
2929 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2930 if (!data)
2931 goto login_task_data_alloc_fail;
2932 conn->login_task->data = conn->data = data;
2933
2934 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
2935 init_waitqueue_head(&conn->ehwait);
2936
2937 return cls_conn;
2938
2939login_task_data_alloc_fail:
2940 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2941 sizeof(void*));
2942login_task_alloc_fail:
2943 iscsi_destroy_conn(cls_conn);
2944 return NULL;
2945}
2946EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2947
2948/**
2949 * iscsi_conn_teardown - teardown iscsi connection
2950 * @cls_conn: iscsi class connection
2951 *
2952 * TODO: we may need to make this into a two step process
2953 * like scsi-mls remove + put host
2954 */
2955void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2956{
2957 struct iscsi_conn *conn = cls_conn->dd_data;
2958 struct iscsi_session *session = conn->session;
2959
2960 del_timer_sync(&conn->transport_timer);
2961
2962 mutex_lock(&session->eh_mutex);
2963 spin_lock_bh(&session->frwd_lock);
2964 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2965 if (session->leadconn == conn) {
2966 /*
2967 * leading connection? then give up on recovery.
2968 */
2969 session->state = ISCSI_STATE_TERMINATE;
2970 wake_up(&conn->ehwait);
2971 }
2972 spin_unlock_bh(&session->frwd_lock);
2973
2974 /* flush queued up work because we free the connection below */
2975 iscsi_suspend_tx(conn);
2976
2977 spin_lock_bh(&session->frwd_lock);
2978 free_pages((unsigned long) conn->data,
2979 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2980 kfree(conn->persistent_address);
2981 kfree(conn->local_ipaddr);
2982 /* regular RX path uses back_lock */
2983 spin_lock_bh(&session->back_lock);
2984 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2985 sizeof(void*));
2986 spin_unlock_bh(&session->back_lock);
2987 if (session->leadconn == conn)
2988 session->leadconn = NULL;
2989 spin_unlock_bh(&session->frwd_lock);
2990 mutex_unlock(&session->eh_mutex);
2991
2992 iscsi_destroy_conn(cls_conn);
2993}
2994EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2995
2996int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2997{
2998 struct iscsi_conn *conn = cls_conn->dd_data;
2999 struct iscsi_session *session = conn->session;
3000
3001 if (!session) {
3002 iscsi_conn_printk(KERN_ERR, conn,
3003 "can't start unbound connection\n");
3004 return -EPERM;
3005 }
3006
3007 if ((session->imm_data_en || !session->initial_r2t_en) &&
3008 session->first_burst > session->max_burst) {
3009 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3010 "first_burst %d max_burst %d\n",
3011 session->first_burst, session->max_burst);
3012 return -EINVAL;
3013 }
3014
3015 if (conn->ping_timeout && !conn->recv_timeout) {
3016 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3017 "zero. Using 5 seconds\n.");
3018 conn->recv_timeout = 5;
3019 }
3020
3021 if (conn->recv_timeout && !conn->ping_timeout) {
3022 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3023 "zero. Using 5 seconds.\n");
3024 conn->ping_timeout = 5;
3025 }
3026
3027 spin_lock_bh(&session->frwd_lock);
3028 conn->c_stage = ISCSI_CONN_STARTED;
3029 session->state = ISCSI_STATE_LOGGED_IN;
3030 session->queued_cmdsn = session->cmdsn;
3031
3032 conn->last_recv = jiffies;
3033 conn->last_ping = jiffies;
3034 if (conn->recv_timeout && conn->ping_timeout)
3035 mod_timer(&conn->transport_timer,
3036 jiffies + (conn->recv_timeout * HZ));
3037
3038 switch(conn->stop_stage) {
3039 case STOP_CONN_RECOVER:
3040 /*
3041 * unblock eh_abort() if it is blocked. re-try all
3042 * commands after successful recovery
3043 */
3044 conn->stop_stage = 0;
3045 conn->tmf_state = TMF_INITIAL;
3046 session->age++;
3047 if (session->age == 16)
3048 session->age = 0;
3049 break;
3050 case STOP_CONN_TERM:
3051 conn->stop_stage = 0;
3052 break;
3053 default:
3054 break;
3055 }
3056 spin_unlock_bh(&session->frwd_lock);
3057
3058 iscsi_unblock_session(session->cls_session);
3059 wake_up(&conn->ehwait);
3060 return 0;
3061}
3062EXPORT_SYMBOL_GPL(iscsi_conn_start);
3063
3064static void
3065fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3066{
3067 struct iscsi_task *task;
3068 int i, state;
3069
3070 for (i = 0; i < conn->session->cmds_max; i++) {
3071 task = conn->session->cmds[i];
3072 if (task->sc)
3073 continue;
3074
3075 if (task->state == ISCSI_TASK_FREE)
3076 continue;
3077
3078 ISCSI_DBG_SESSION(conn->session,
3079 "failing mgmt itt 0x%x state %d\n",
3080 task->itt, task->state);
3081 state = ISCSI_TASK_ABRT_SESS_RECOV;
3082 if (task->state == ISCSI_TASK_PENDING)
3083 state = ISCSI_TASK_COMPLETED;
3084 spin_lock_bh(&session->back_lock);
3085 iscsi_complete_task(task, state);
3086 spin_unlock_bh(&session->back_lock);
3087 }
3088}
3089
3090static void iscsi_start_session_recovery(struct iscsi_session *session,
3091 struct iscsi_conn *conn, int flag)
3092{
3093 int old_stop_stage;
3094
3095 mutex_lock(&session->eh_mutex);
3096 spin_lock_bh(&session->frwd_lock);
3097 if (conn->stop_stage == STOP_CONN_TERM) {
3098 spin_unlock_bh(&session->frwd_lock);
3099 mutex_unlock(&session->eh_mutex);
3100 return;
3101 }
3102
3103 /*
3104 * When this is called for the in_login state, we only want to clean
3105 * up the login task and connection. We do not need to block and set
3106 * the recovery state again
3107 */
3108 if (flag == STOP_CONN_TERM)
3109 session->state = ISCSI_STATE_TERMINATE;
3110 else if (conn->stop_stage != STOP_CONN_RECOVER)
3111 session->state = ISCSI_STATE_IN_RECOVERY;
3112
3113 old_stop_stage = conn->stop_stage;
3114 conn->stop_stage = flag;
3115 spin_unlock_bh(&session->frwd_lock);
3116
3117 del_timer_sync(&conn->transport_timer);
3118 iscsi_suspend_tx(conn);
3119
3120 spin_lock_bh(&session->frwd_lock);
3121 conn->c_stage = ISCSI_CONN_STOPPED;
3122 spin_unlock_bh(&session->frwd_lock);
3123
3124 /*
3125 * for connection level recovery we should not calculate
3126 * header digest. conn->hdr_size used for optimization
3127 * in hdr_extract() and will be re-negotiated at
3128 * set_param() time.
3129 */
3130 if (flag == STOP_CONN_RECOVER) {
3131 conn->hdrdgst_en = 0;
3132 conn->datadgst_en = 0;
3133 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3134 old_stop_stage != STOP_CONN_RECOVER) {
3135 ISCSI_DBG_SESSION(session, "blocking session\n");
3136 iscsi_block_session(session->cls_session);
3137 }
3138 }
3139
3140 /*
3141 * flush queues.
3142 */
3143 spin_lock_bh(&session->frwd_lock);
3144 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3145 fail_mgmt_tasks(session, conn);
3146 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3147 spin_unlock_bh(&session->frwd_lock);
3148 mutex_unlock(&session->eh_mutex);
3149}
3150
3151void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3152{
3153 struct iscsi_conn *conn = cls_conn->dd_data;
3154 struct iscsi_session *session = conn->session;
3155
3156 switch (flag) {
3157 case STOP_CONN_RECOVER:
3158 cls_conn->state = ISCSI_CONN_FAILED;
3159 break;
3160 case STOP_CONN_TERM:
3161 cls_conn->state = ISCSI_CONN_DOWN;
3162 break;
3163 default:
3164 iscsi_conn_printk(KERN_ERR, conn,
3165 "invalid stop flag %d\n", flag);
3166 return;
3167 }
3168
3169 iscsi_start_session_recovery(session, conn, flag);
3170}
3171EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3172
3173int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3174 struct iscsi_cls_conn *cls_conn, int is_leading)
3175{
3176 struct iscsi_session *session = cls_session->dd_data;
3177 struct iscsi_conn *conn = cls_conn->dd_data;
3178
3179 spin_lock_bh(&session->frwd_lock);
3180 if (is_leading)
3181 session->leadconn = conn;
3182 spin_unlock_bh(&session->frwd_lock);
3183
3184 /*
3185 * Unblock xmitworker(), Login Phase will pass through.
3186 */
3187 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3188 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3189 return 0;
3190}
3191EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3192
3193int iscsi_switch_str_param(char **param, char *new_val_buf)
3194{
3195 char *new_val;
3196
3197 if (*param) {
3198 if (!strcmp(*param, new_val_buf))
3199 return 0;
3200 }
3201
3202 new_val = kstrdup(new_val_buf, GFP_NOIO);
3203 if (!new_val)
3204 return -ENOMEM;
3205
3206 kfree(*param);
3207 *param = new_val;
3208 return 0;
3209}
3210EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3211
3212int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3213 enum iscsi_param param, char *buf, int buflen)
3214{
3215 struct iscsi_conn *conn = cls_conn->dd_data;
3216 struct iscsi_session *session = conn->session;
3217 int val;
3218
3219 switch(param) {
3220 case ISCSI_PARAM_FAST_ABORT:
3221 sscanf(buf, "%d", &session->fast_abort);
3222 break;
3223 case ISCSI_PARAM_ABORT_TMO:
3224 sscanf(buf, "%d", &session->abort_timeout);
3225 break;
3226 case ISCSI_PARAM_LU_RESET_TMO:
3227 sscanf(buf, "%d", &session->lu_reset_timeout);
3228 break;
3229 case ISCSI_PARAM_TGT_RESET_TMO:
3230 sscanf(buf, "%d", &session->tgt_reset_timeout);
3231 break;
3232 case ISCSI_PARAM_PING_TMO:
3233 sscanf(buf, "%d", &conn->ping_timeout);
3234 break;
3235 case ISCSI_PARAM_RECV_TMO:
3236 sscanf(buf, "%d", &conn->recv_timeout);
3237 break;
3238 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3239 sscanf(buf, "%d", &conn->max_recv_dlength);
3240 break;
3241 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3242 sscanf(buf, "%d", &conn->max_xmit_dlength);
3243 break;
3244 case ISCSI_PARAM_HDRDGST_EN:
3245 sscanf(buf, "%d", &conn->hdrdgst_en);
3246 break;
3247 case ISCSI_PARAM_DATADGST_EN:
3248 sscanf(buf, "%d", &conn->datadgst_en);
3249 break;
3250 case ISCSI_PARAM_INITIAL_R2T_EN:
3251 sscanf(buf, "%d", &session->initial_r2t_en);
3252 break;
3253 case ISCSI_PARAM_MAX_R2T:
3254 sscanf(buf, "%hu", &session->max_r2t);
3255 break;
3256 case ISCSI_PARAM_IMM_DATA_EN:
3257 sscanf(buf, "%d", &session->imm_data_en);
3258 break;
3259 case ISCSI_PARAM_FIRST_BURST:
3260 sscanf(buf, "%d", &session->first_burst);
3261 break;
3262 case ISCSI_PARAM_MAX_BURST:
3263 sscanf(buf, "%d", &session->max_burst);
3264 break;
3265 case ISCSI_PARAM_PDU_INORDER_EN:
3266 sscanf(buf, "%d", &session->pdu_inorder_en);
3267 break;
3268 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3269 sscanf(buf, "%d", &session->dataseq_inorder_en);
3270 break;
3271 case ISCSI_PARAM_ERL:
3272 sscanf(buf, "%d", &session->erl);
3273 break;
3274 case ISCSI_PARAM_EXP_STATSN:
3275 sscanf(buf, "%u", &conn->exp_statsn);
3276 break;
3277 case ISCSI_PARAM_USERNAME:
3278 return iscsi_switch_str_param(&session->username, buf);
3279 case ISCSI_PARAM_USERNAME_IN:
3280 return iscsi_switch_str_param(&session->username_in, buf);
3281 case ISCSI_PARAM_PASSWORD:
3282 return iscsi_switch_str_param(&session->password, buf);
3283 case ISCSI_PARAM_PASSWORD_IN:
3284 return iscsi_switch_str_param(&session->password_in, buf);
3285 case ISCSI_PARAM_TARGET_NAME:
3286 return iscsi_switch_str_param(&session->targetname, buf);
3287 case ISCSI_PARAM_TARGET_ALIAS:
3288 return iscsi_switch_str_param(&session->targetalias, buf);
3289 case ISCSI_PARAM_TPGT:
3290 sscanf(buf, "%d", &session->tpgt);
3291 break;
3292 case ISCSI_PARAM_PERSISTENT_PORT:
3293 sscanf(buf, "%d", &conn->persistent_port);
3294 break;
3295 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3296 return iscsi_switch_str_param(&conn->persistent_address, buf);
3297 case ISCSI_PARAM_IFACE_NAME:
3298 return iscsi_switch_str_param(&session->ifacename, buf);
3299 case ISCSI_PARAM_INITIATOR_NAME:
3300 return iscsi_switch_str_param(&session->initiatorname, buf);
3301 case ISCSI_PARAM_BOOT_ROOT:
3302 return iscsi_switch_str_param(&session->boot_root, buf);
3303 case ISCSI_PARAM_BOOT_NIC:
3304 return iscsi_switch_str_param(&session->boot_nic, buf);
3305 case ISCSI_PARAM_BOOT_TARGET:
3306 return iscsi_switch_str_param(&session->boot_target, buf);
3307 case ISCSI_PARAM_PORTAL_TYPE:
3308 return iscsi_switch_str_param(&session->portal_type, buf);
3309 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3310 return iscsi_switch_str_param(&session->discovery_parent_type,
3311 buf);
3312 case ISCSI_PARAM_DISCOVERY_SESS:
3313 sscanf(buf, "%d", &val);
3314 session->discovery_sess = !!val;
3315 break;
3316 case ISCSI_PARAM_LOCAL_IPADDR:
3317 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3318 default:
3319 return -ENOSYS;
3320 }
3321
3322 return 0;
3323}
3324EXPORT_SYMBOL_GPL(iscsi_set_param);
3325
3326int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3327 enum iscsi_param param, char *buf)
3328{
3329 struct iscsi_session *session = cls_session->dd_data;
3330 int len;
3331
3332 switch(param) {
3333 case ISCSI_PARAM_FAST_ABORT:
3334 len = sprintf(buf, "%d\n", session->fast_abort);
3335 break;
3336 case ISCSI_PARAM_ABORT_TMO:
3337 len = sprintf(buf, "%d\n", session->abort_timeout);
3338 break;
3339 case ISCSI_PARAM_LU_RESET_TMO:
3340 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3341 break;
3342 case ISCSI_PARAM_TGT_RESET_TMO:
3343 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3344 break;
3345 case ISCSI_PARAM_INITIAL_R2T_EN:
3346 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3347 break;
3348 case ISCSI_PARAM_MAX_R2T:
3349 len = sprintf(buf, "%hu\n", session->max_r2t);
3350 break;
3351 case ISCSI_PARAM_IMM_DATA_EN:
3352 len = sprintf(buf, "%d\n", session->imm_data_en);
3353 break;
3354 case ISCSI_PARAM_FIRST_BURST:
3355 len = sprintf(buf, "%u\n", session->first_burst);
3356 break;
3357 case ISCSI_PARAM_MAX_BURST:
3358 len = sprintf(buf, "%u\n", session->max_burst);
3359 break;
3360 case ISCSI_PARAM_PDU_INORDER_EN:
3361 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3362 break;
3363 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3364 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3365 break;
3366 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3367 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3368 break;
3369 case ISCSI_PARAM_ERL:
3370 len = sprintf(buf, "%d\n", session->erl);
3371 break;
3372 case ISCSI_PARAM_TARGET_NAME:
3373 len = sprintf(buf, "%s\n", session->targetname);
3374 break;
3375 case ISCSI_PARAM_TARGET_ALIAS:
3376 len = sprintf(buf, "%s\n", session->targetalias);
3377 break;
3378 case ISCSI_PARAM_TPGT:
3379 len = sprintf(buf, "%d\n", session->tpgt);
3380 break;
3381 case ISCSI_PARAM_USERNAME:
3382 len = sprintf(buf, "%s\n", session->username);
3383 break;
3384 case ISCSI_PARAM_USERNAME_IN:
3385 len = sprintf(buf, "%s\n", session->username_in);
3386 break;
3387 case ISCSI_PARAM_PASSWORD:
3388 len = sprintf(buf, "%s\n", session->password);
3389 break;
3390 case ISCSI_PARAM_PASSWORD_IN:
3391 len = sprintf(buf, "%s\n", session->password_in);
3392 break;
3393 case ISCSI_PARAM_IFACE_NAME:
3394 len = sprintf(buf, "%s\n", session->ifacename);
3395 break;
3396 case ISCSI_PARAM_INITIATOR_NAME:
3397 len = sprintf(buf, "%s\n", session->initiatorname);
3398 break;
3399 case ISCSI_PARAM_BOOT_ROOT:
3400 len = sprintf(buf, "%s\n", session->boot_root);
3401 break;
3402 case ISCSI_PARAM_BOOT_NIC:
3403 len = sprintf(buf, "%s\n", session->boot_nic);
3404 break;
3405 case ISCSI_PARAM_BOOT_TARGET:
3406 len = sprintf(buf, "%s\n", session->boot_target);
3407 break;
3408 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3409 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3410 break;
3411 case ISCSI_PARAM_DISCOVERY_SESS:
3412 len = sprintf(buf, "%u\n", session->discovery_sess);
3413 break;
3414 case ISCSI_PARAM_PORTAL_TYPE:
3415 len = sprintf(buf, "%s\n", session->portal_type);
3416 break;
3417 case ISCSI_PARAM_CHAP_AUTH_EN:
3418 len = sprintf(buf, "%u\n", session->chap_auth_en);
3419 break;
3420 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3421 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3422 break;
3423 case ISCSI_PARAM_BIDI_CHAP_EN:
3424 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3425 break;
3426 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3427 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3428 break;
3429 case ISCSI_PARAM_DEF_TIME2WAIT:
3430 len = sprintf(buf, "%d\n", session->time2wait);
3431 break;
3432 case ISCSI_PARAM_DEF_TIME2RETAIN:
3433 len = sprintf(buf, "%d\n", session->time2retain);
3434 break;
3435 case ISCSI_PARAM_TSID:
3436 len = sprintf(buf, "%u\n", session->tsid);
3437 break;
3438 case ISCSI_PARAM_ISID:
3439 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3440 session->isid[0], session->isid[1],
3441 session->isid[2], session->isid[3],
3442 session->isid[4], session->isid[5]);
3443 break;
3444 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3445 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3446 break;
3447 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3448 if (session->discovery_parent_type)
3449 len = sprintf(buf, "%s\n",
3450 session->discovery_parent_type);
3451 else
3452 len = sprintf(buf, "\n");
3453 break;
3454 default:
3455 return -ENOSYS;
3456 }
3457
3458 return len;
3459}
3460EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3461
3462int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3463 enum iscsi_param param, char *buf)
3464{
3465 struct sockaddr_in6 *sin6 = NULL;
3466 struct sockaddr_in *sin = NULL;
3467 int len;
3468
3469 switch (addr->ss_family) {
3470 case AF_INET:
3471 sin = (struct sockaddr_in *)addr;
3472 break;
3473 case AF_INET6:
3474 sin6 = (struct sockaddr_in6 *)addr;
3475 break;
3476 default:
3477 return -EINVAL;
3478 }
3479
3480 switch (param) {
3481 case ISCSI_PARAM_CONN_ADDRESS:
3482 case ISCSI_HOST_PARAM_IPADDRESS:
3483 if (sin)
3484 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3485 else
3486 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3487 break;
3488 case ISCSI_PARAM_CONN_PORT:
3489 case ISCSI_PARAM_LOCAL_PORT:
3490 if (sin)
3491 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3492 else
3493 len = sprintf(buf, "%hu\n",
3494 be16_to_cpu(sin6->sin6_port));
3495 break;
3496 default:
3497 return -EINVAL;
3498 }
3499
3500 return len;
3501}
3502EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3503
3504int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3505 enum iscsi_param param, char *buf)
3506{
3507 struct iscsi_conn *conn = cls_conn->dd_data;
3508 int len;
3509
3510 switch(param) {
3511 case ISCSI_PARAM_PING_TMO:
3512 len = sprintf(buf, "%u\n", conn->ping_timeout);
3513 break;
3514 case ISCSI_PARAM_RECV_TMO:
3515 len = sprintf(buf, "%u\n", conn->recv_timeout);
3516 break;
3517 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3518 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3519 break;
3520 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3521 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3522 break;
3523 case ISCSI_PARAM_HDRDGST_EN:
3524 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3525 break;
3526 case ISCSI_PARAM_DATADGST_EN:
3527 len = sprintf(buf, "%d\n", conn->datadgst_en);
3528 break;
3529 case ISCSI_PARAM_IFMARKER_EN:
3530 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3531 break;
3532 case ISCSI_PARAM_OFMARKER_EN:
3533 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3534 break;
3535 case ISCSI_PARAM_EXP_STATSN:
3536 len = sprintf(buf, "%u\n", conn->exp_statsn);
3537 break;
3538 case ISCSI_PARAM_PERSISTENT_PORT:
3539 len = sprintf(buf, "%d\n", conn->persistent_port);
3540 break;
3541 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3542 len = sprintf(buf, "%s\n", conn->persistent_address);
3543 break;
3544 case ISCSI_PARAM_STATSN:
3545 len = sprintf(buf, "%u\n", conn->statsn);
3546 break;
3547 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3548 len = sprintf(buf, "%u\n", conn->max_segment_size);
3549 break;
3550 case ISCSI_PARAM_KEEPALIVE_TMO:
3551 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3552 break;
3553 case ISCSI_PARAM_LOCAL_PORT:
3554 len = sprintf(buf, "%u\n", conn->local_port);
3555 break;
3556 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3557 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3558 break;
3559 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3560 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3561 break;
3562 case ISCSI_PARAM_TCP_WSF_DISABLE:
3563 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3564 break;
3565 case ISCSI_PARAM_TCP_TIMER_SCALE:
3566 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3567 break;
3568 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3569 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3570 break;
3571 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3572 len = sprintf(buf, "%u\n", conn->fragment_disable);
3573 break;
3574 case ISCSI_PARAM_IPV4_TOS:
3575 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3576 break;
3577 case ISCSI_PARAM_IPV6_TC:
3578 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3579 break;
3580 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3581 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3582 break;
3583 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3584 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3585 break;
3586 case ISCSI_PARAM_TCP_XMIT_WSF:
3587 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3588 break;
3589 case ISCSI_PARAM_TCP_RECV_WSF:
3590 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3591 break;
3592 case ISCSI_PARAM_LOCAL_IPADDR:
3593 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3594 break;
3595 default:
3596 return -ENOSYS;
3597 }
3598
3599 return len;
3600}
3601EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3602
3603int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3604 char *buf)
3605{
3606 struct iscsi_host *ihost = shost_priv(shost);
3607 int len;
3608
3609 switch (param) {
3610 case ISCSI_HOST_PARAM_NETDEV_NAME:
3611 len = sprintf(buf, "%s\n", ihost->netdev);
3612 break;
3613 case ISCSI_HOST_PARAM_HWADDRESS:
3614 len = sprintf(buf, "%s\n", ihost->hwaddress);
3615 break;
3616 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3617 len = sprintf(buf, "%s\n", ihost->initiatorname);
3618 break;
3619 default:
3620 return -ENOSYS;
3621 }
3622
3623 return len;
3624}
3625EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3626
3627int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3628 char *buf, int buflen)
3629{
3630 struct iscsi_host *ihost = shost_priv(shost);
3631
3632 switch (param) {
3633 case ISCSI_HOST_PARAM_NETDEV_NAME:
3634 return iscsi_switch_str_param(&ihost->netdev, buf);
3635 case ISCSI_HOST_PARAM_HWADDRESS:
3636 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3637 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3638 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3639 default:
3640 return -ENOSYS;
3641 }
3642
3643 return 0;
3644}
3645EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3646
3647MODULE_AUTHOR("Mike Christie");
3648MODULE_DESCRIPTION("iSCSI library functions");
3649MODULE_LICENSE("GPL");