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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/*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24#include <linux/types.h>
25#include <linux/kfifo.h>
26#include <linux/delay.h>
27#include <linux/log2.h>
28#include <linux/slab.h>
29#include <linux/module.h>
30#include <asm/unaligned.h>
31#include <net/tcp.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_eh.h>
35#include <scsi/scsi_tcq.h>
36#include <scsi/scsi_host.h>
37#include <scsi/scsi.h>
38#include <scsi/iscsi_proto.h>
39#include <scsi/scsi_transport.h>
40#include <scsi/scsi_transport_iscsi.h>
41#include <scsi/libiscsi.h>
42
43static int iscsi_dbg_lib_conn;
44module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
45 S_IRUGO | S_IWUSR);
46MODULE_PARM_DESC(debug_libiscsi_conn,
47 "Turn on debugging for connections in libiscsi module. "
48 "Set to 1 to turn on, and zero to turn off. Default is off.");
49
50static int iscsi_dbg_lib_session;
51module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
52 S_IRUGO | S_IWUSR);
53MODULE_PARM_DESC(debug_libiscsi_session,
54 "Turn on debugging for sessions in libiscsi module. "
55 "Set to 1 to turn on, and zero to turn off. Default is off.");
56
57static int iscsi_dbg_lib_eh;
58module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
59 S_IRUGO | S_IWUSR);
60MODULE_PARM_DESC(debug_libiscsi_eh,
61 "Turn on debugging for error handling in libiscsi module. "
62 "Set to 1 to turn on, and zero to turn off. Default is off.");
63
64#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
65 do { \
66 if (iscsi_dbg_lib_conn) \
67 iscsi_conn_printk(KERN_INFO, _conn, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 } while (0);
71
72#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
73 do { \
74 if (iscsi_dbg_lib_session) \
75 iscsi_session_printk(KERN_INFO, _session, \
76 "%s " dbg_fmt, \
77 __func__, ##arg); \
78 } while (0);
79
80#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
81 do { \
82 if (iscsi_dbg_lib_eh) \
83 iscsi_session_printk(KERN_INFO, _session, \
84 "%s " dbg_fmt, \
85 __func__, ##arg); \
86 } while (0);
87
88inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
89{
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
92
93 if (ihost->workq)
94 queue_work(ihost->workq, &conn->xmitwork);
95}
96EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
97
98static void __iscsi_update_cmdsn(struct iscsi_session *session,
99 uint32_t exp_cmdsn, uint32_t max_cmdsn)
100{
101 /*
102 * standard specifies this check for when to update expected and
103 * max sequence numbers
104 */
105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
106 return;
107
108 if (exp_cmdsn != session->exp_cmdsn &&
109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
110 session->exp_cmdsn = exp_cmdsn;
111
112 if (max_cmdsn != session->max_cmdsn &&
113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
114 session->max_cmdsn = max_cmdsn;
115}
116
117void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
118{
119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
120 be32_to_cpu(hdr->max_cmdsn));
121}
122EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
123
124/**
125 * iscsi_prep_data_out_pdu - initialize Data-Out
126 * @task: scsi command task
127 * @r2t: R2T info
128 * @hdr: iscsi data in pdu
129 *
130 * Notes:
131 * Initialize Data-Out within this R2T sequence and finds
132 * proper data_offset within this SCSI command.
133 *
134 * This function is called with connection lock taken.
135 **/
136void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
137 struct iscsi_data *hdr)
138{
139 struct iscsi_conn *conn = task->conn;
140 unsigned int left = r2t->data_length - r2t->sent;
141
142 task->hdr_len = sizeof(struct iscsi_data);
143
144 memset(hdr, 0, sizeof(struct iscsi_data));
145 hdr->ttt = r2t->ttt;
146 hdr->datasn = cpu_to_be32(r2t->datasn);
147 r2t->datasn++;
148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
149 hdr->lun = task->lun;
150 hdr->itt = task->hdr_itt;
151 hdr->exp_statsn = r2t->exp_statsn;
152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
153 if (left > conn->max_xmit_dlength) {
154 hton24(hdr->dlength, conn->max_xmit_dlength);
155 r2t->data_count = conn->max_xmit_dlength;
156 hdr->flags = 0;
157 } else {
158 hton24(hdr->dlength, left);
159 r2t->data_count = left;
160 hdr->flags = ISCSI_FLAG_CMD_FINAL;
161 }
162 conn->dataout_pdus_cnt++;
163}
164EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
165
166static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
167{
168 unsigned exp_len = task->hdr_len + len;
169
170 if (exp_len > task->hdr_max) {
171 WARN_ON(1);
172 return -EINVAL;
173 }
174
175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
176 task->hdr_len = exp_len;
177 return 0;
178}
179
180/*
181 * make an extended cdb AHS
182 */
183static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
184{
185 struct scsi_cmnd *cmd = task->sc;
186 unsigned rlen, pad_len;
187 unsigned short ahslength;
188 struct iscsi_ecdb_ahdr *ecdb_ahdr;
189 int rc;
190
191 ecdb_ahdr = iscsi_next_hdr(task);
192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
193
194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
195 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
196
197 pad_len = iscsi_padding(rlen);
198
199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
201 if (rc)
202 return rc;
203
204 if (pad_len)
205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
206
207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
209 ecdb_ahdr->reserved = 0;
210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
211
212 ISCSI_DBG_SESSION(task->conn->session,
213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
216 task->hdr_len);
217 return 0;
218}
219
220static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
221{
222 struct scsi_cmnd *sc = task->sc;
223 struct iscsi_rlength_ahdr *rlen_ahdr;
224 int rc;
225
226 rlen_ahdr = iscsi_next_hdr(task);
227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
228 if (rc)
229 return rc;
230
231 rlen_ahdr->ahslength =
232 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
233 sizeof(rlen_ahdr->reserved));
234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
235 rlen_ahdr->reserved = 0;
236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
237
238 ISCSI_DBG_SESSION(task->conn->session,
239 "bidi-in rlen_ahdr->read_length(%d) "
240 "rlen_ahdr->ahslength(%d)\n",
241 be32_to_cpu(rlen_ahdr->read_length),
242 be16_to_cpu(rlen_ahdr->ahslength));
243 return 0;
244}
245
246/**
247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
248 * @task: iscsi task
249 * @opcode: opcode to check for
250 *
251 * During TMF a task has to be checked if it's affected.
252 * All unrelated I/O can be passed through, but I/O to the
253 * affected LUN should be restricted.
254 * If 'fast_abort' is set we won't be sending any I/O to the
255 * affected LUN.
256 * Otherwise the target is waiting for all TTTs to be completed,
257 * so we have to send all outstanding Data-Out PDUs to the target.
258 */
259static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
260{
261 struct iscsi_conn *conn = task->conn;
262 struct iscsi_tm *tmf = &conn->tmhdr;
263 u64 hdr_lun;
264
265 if (conn->tmf_state == TMF_INITIAL)
266 return 0;
267
268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
269 return 0;
270
271 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
273 /*
274 * Allow PDUs for unrelated LUNs
275 */
276 hdr_lun = scsilun_to_int(&tmf->lun);
277 if (hdr_lun != task->sc->device->lun)
278 return 0;
279 /* fall through */
280 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
281 /*
282 * Fail all SCSI cmd PDUs
283 */
284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
285 iscsi_conn_printk(KERN_INFO, conn,
286 "task [op %x/%x itt "
287 "0x%x/0x%x] "
288 "rejected.\n",
289 task->hdr->opcode, opcode,
290 task->itt, task->hdr_itt);
291 return -EACCES;
292 }
293 /*
294 * And also all data-out PDUs in response to R2T
295 * if fast_abort is set.
296 */
297 if (conn->session->fast_abort) {
298 iscsi_conn_printk(KERN_INFO, conn,
299 "task [op %x/%x itt "
300 "0x%x/0x%x] fast abort.\n",
301 task->hdr->opcode, opcode,
302 task->itt, task->hdr_itt);
303 return -EACCES;
304 }
305 break;
306 case ISCSI_TM_FUNC_ABORT_TASK:
307 /*
308 * the caller has already checked if the task
309 * they want to abort was in the pending queue so if
310 * we are here the cmd pdu has gone out already, and
311 * we will only hit this for data-outs
312 */
313 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
314 task->hdr_itt == tmf->rtt) {
315 ISCSI_DBG_SESSION(conn->session,
316 "Preventing task %x/%x from sending "
317 "data-out due to abort task in "
318 "progress\n", task->itt,
319 task->hdr_itt);
320 return -EACCES;
321 }
322 break;
323 }
324
325 return 0;
326}
327
328/**
329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
330 * @task: iscsi task
331 *
332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
333 * fields like dlength or final based on how much data it sends
334 */
335static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
336{
337 struct iscsi_conn *conn = task->conn;
338 struct iscsi_session *session = conn->session;
339 struct scsi_cmnd *sc = task->sc;
340 struct iscsi_scsi_req *hdr;
341 unsigned hdrlength, cmd_len, transfer_length;
342 itt_t itt;
343 int rc;
344
345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
346 if (rc)
347 return rc;
348
349 if (conn->session->tt->alloc_pdu) {
350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
351 if (rc)
352 return rc;
353 }
354 hdr = (struct iscsi_scsi_req *)task->hdr;
355 itt = hdr->itt;
356 memset(hdr, 0, sizeof(*hdr));
357
358 if (session->tt->parse_pdu_itt)
359 hdr->itt = task->hdr_itt = itt;
360 else
361 hdr->itt = task->hdr_itt = build_itt(task->itt,
362 task->conn->session->age);
363 task->hdr_len = 0;
364 rc = iscsi_add_hdr(task, sizeof(*hdr));
365 if (rc)
366 return rc;
367 hdr->opcode = ISCSI_OP_SCSI_CMD;
368 hdr->flags = ISCSI_ATTR_SIMPLE;
369 int_to_scsilun(sc->device->lun, &hdr->lun);
370 task->lun = hdr->lun;
371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
372 cmd_len = sc->cmd_len;
373 if (cmd_len < ISCSI_CDB_SIZE)
374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
375 else if (cmd_len > ISCSI_CDB_SIZE) {
376 rc = iscsi_prep_ecdb_ahs(task);
377 if (rc)
378 return rc;
379 cmd_len = ISCSI_CDB_SIZE;
380 }
381 memcpy(hdr->cdb, sc->cmnd, cmd_len);
382
383 task->imm_count = 0;
384 if (scsi_bidi_cmnd(sc)) {
385 hdr->flags |= ISCSI_FLAG_CMD_READ;
386 rc = iscsi_prep_bidi_ahs(task);
387 if (rc)
388 return rc;
389 }
390
391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
392 task->protected = true;
393
394 transfer_length = scsi_transfer_length(sc);
395 hdr->data_length = cpu_to_be32(transfer_length);
396 if (sc->sc_data_direction == DMA_TO_DEVICE) {
397 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
398
399 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
400 /*
401 * Write counters:
402 *
403 * imm_count bytes to be sent right after
404 * SCSI PDU Header
405 *
406 * unsol_count bytes(as Data-Out) to be sent
407 * without R2T ack right after
408 * immediate data
409 *
410 * r2t data_length bytes to be sent via R2T ack's
411 *
412 * pad_count bytes to be sent as zero-padding
413 */
414 memset(r2t, 0, sizeof(*r2t));
415
416 if (session->imm_data_en) {
417 if (transfer_length >= session->first_burst)
418 task->imm_count = min(session->first_burst,
419 conn->max_xmit_dlength);
420 else
421 task->imm_count = min(transfer_length,
422 conn->max_xmit_dlength);
423 hton24(hdr->dlength, task->imm_count);
424 } else
425 zero_data(hdr->dlength);
426
427 if (!session->initial_r2t_en) {
428 r2t->data_length = min(session->first_burst,
429 transfer_length) -
430 task->imm_count;
431 r2t->data_offset = task->imm_count;
432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
434 }
435
436 if (!task->unsol_r2t.data_length)
437 /* No unsolicit Data-Out's */
438 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
439 } else {
440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
441 zero_data(hdr->dlength);
442
443 if (sc->sc_data_direction == DMA_FROM_DEVICE)
444 hdr->flags |= ISCSI_FLAG_CMD_READ;
445 }
446
447 /* calculate size of additional header segments (AHSs) */
448 hdrlength = task->hdr_len - sizeof(*hdr);
449
450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
451 hdrlength /= ISCSI_PAD_LEN;
452
453 WARN_ON(hdrlength >= 256);
454 hdr->hlength = hdrlength & 0xFF;
455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
456
457 if (session->tt->init_task && session->tt->init_task(task))
458 return -EIO;
459
460 task->state = ISCSI_TASK_RUNNING;
461 session->cmdsn++;
462
463 conn->scsicmd_pdus_cnt++;
464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
466 scsi_bidi_cmnd(sc) ? "bidirectional" :
467 sc->sc_data_direction == DMA_TO_DEVICE ?
468 "write" : "read", conn->id, sc, sc->cmnd[0],
469 task->itt, transfer_length,
470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
471 session->cmdsn,
472 session->max_cmdsn - session->exp_cmdsn + 1);
473 return 0;
474}
475
476/**
477 * iscsi_free_task - free a task
478 * @task: iscsi cmd task
479 *
480 * Must be called with session back_lock.
481 * This function returns the scsi command to scsi-ml or cleans
482 * up mgmt tasks then returns the task to the pool.
483 */
484static void iscsi_free_task(struct iscsi_task *task)
485{
486 struct iscsi_conn *conn = task->conn;
487 struct iscsi_session *session = conn->session;
488 struct scsi_cmnd *sc = task->sc;
489 int oldstate = task->state;
490
491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
492 task->itt, task->state, task->sc);
493
494 session->tt->cleanup_task(task);
495 task->state = ISCSI_TASK_FREE;
496 task->sc = NULL;
497 /*
498 * login task is preallocated so do not free
499 */
500 if (conn->login_task == task)
501 return;
502
503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
504
505 if (sc) {
506 /* SCSI eh reuses commands to verify us */
507 sc->SCp.ptr = NULL;
508 /*
509 * queue command may call this to free the task, so
510 * it will decide how to return sc to scsi-ml.
511 */
512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
513 sc->scsi_done(sc);
514 }
515}
516
517void __iscsi_get_task(struct iscsi_task *task)
518{
519 atomic_inc(&task->refcount);
520}
521EXPORT_SYMBOL_GPL(__iscsi_get_task);
522
523void __iscsi_put_task(struct iscsi_task *task)
524{
525 if (atomic_dec_and_test(&task->refcount))
526 iscsi_free_task(task);
527}
528EXPORT_SYMBOL_GPL(__iscsi_put_task);
529
530void iscsi_put_task(struct iscsi_task *task)
531{
532 struct iscsi_session *session = task->conn->session;
533
534 /* regular RX path uses back_lock */
535 spin_lock_bh(&session->back_lock);
536 __iscsi_put_task(task);
537 spin_unlock_bh(&session->back_lock);
538}
539EXPORT_SYMBOL_GPL(iscsi_put_task);
540
541/**
542 * iscsi_complete_task - finish a task
543 * @task: iscsi cmd task
544 * @state: state to complete task with
545 *
546 * Must be called with session back_lock.
547 */
548static void iscsi_complete_task(struct iscsi_task *task, int state)
549{
550 struct iscsi_conn *conn = task->conn;
551
552 ISCSI_DBG_SESSION(conn->session,
553 "complete task itt 0x%x state %d sc %p\n",
554 task->itt, task->state, task->sc);
555 if (task->state == ISCSI_TASK_COMPLETED ||
556 task->state == ISCSI_TASK_ABRT_TMF ||
557 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
558 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
559 return;
560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
561 task->state = state;
562
563 if (!list_empty(&task->running))
564 list_del_init(&task->running);
565
566 if (conn->task == task)
567 conn->task = NULL;
568
569 if (conn->ping_task == task)
570 conn->ping_task = NULL;
571
572 /* release get from queueing */
573 __iscsi_put_task(task);
574}
575
576/**
577 * iscsi_complete_scsi_task - finish scsi task normally
578 * @task: iscsi task for scsi cmd
579 * @exp_cmdsn: expected cmd sn in cpu format
580 * @max_cmdsn: max cmd sn in cpu format
581 *
582 * This is used when drivers do not need or cannot perform
583 * lower level pdu processing.
584 *
585 * Called with session back_lock
586 */
587void iscsi_complete_scsi_task(struct iscsi_task *task,
588 uint32_t exp_cmdsn, uint32_t max_cmdsn)
589{
590 struct iscsi_conn *conn = task->conn;
591
592 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
593
594 conn->last_recv = jiffies;
595 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
596 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
597}
598EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
599
600
601/*
602 * session back_lock must be held and if not called for a task that is
603 * still pending or from the xmit thread, then xmit thread must
604 * be suspended.
605 */
606static void fail_scsi_task(struct iscsi_task *task, int err)
607{
608 struct iscsi_conn *conn = task->conn;
609 struct scsi_cmnd *sc;
610 int state;
611
612 /*
613 * if a command completes and we get a successful tmf response
614 * we will hit this because the scsi eh abort code does not take
615 * a ref to the task.
616 */
617 sc = task->sc;
618 if (!sc)
619 return;
620
621 if (task->state == ISCSI_TASK_PENDING) {
622 /*
623 * cmd never made it to the xmit thread, so we should not count
624 * the cmd in the sequencing
625 */
626 conn->session->queued_cmdsn--;
627 /* it was never sent so just complete like normal */
628 state = ISCSI_TASK_COMPLETED;
629 } else if (err == DID_TRANSPORT_DISRUPTED)
630 state = ISCSI_TASK_ABRT_SESS_RECOV;
631 else
632 state = ISCSI_TASK_ABRT_TMF;
633
634 sc->result = err << 16;
635 if (!scsi_bidi_cmnd(sc))
636 scsi_set_resid(sc, scsi_bufflen(sc));
637 else {
638 scsi_out(sc)->resid = scsi_out(sc)->length;
639 scsi_in(sc)->resid = scsi_in(sc)->length;
640 }
641
642 /* regular RX path uses back_lock */
643 spin_lock_bh(&conn->session->back_lock);
644 iscsi_complete_task(task, state);
645 spin_unlock_bh(&conn->session->back_lock);
646}
647
648static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
649 struct iscsi_task *task)
650{
651 struct iscsi_session *session = conn->session;
652 struct iscsi_hdr *hdr = task->hdr;
653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
655
656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
657 return -ENOTCONN;
658
659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
661 /*
662 * pre-format CmdSN for outgoing PDU.
663 */
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
666 /*
667 * TODO: We always use immediate for normal session pdus.
668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
670 *
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
673 */
674 if (conn->c_stage == ISCSI_CONN_STARTED &&
675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
676 session->queued_cmdsn++;
677 session->cmdsn++;
678 }
679 }
680
681 if (session->tt->init_task && session->tt->init_task(task))
682 return -EIO;
683
684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
685 session->state = ISCSI_STATE_LOGGING_OUT;
686
687 task->state = ISCSI_TASK_RUNNING;
688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
690 hdr->itt, task->data_count);
691 return 0;
692}
693
694static struct iscsi_task *
695__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
696 char *data, uint32_t data_size)
697{
698 struct iscsi_session *session = conn->session;
699 struct iscsi_host *ihost = shost_priv(session->host);
700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
701 struct iscsi_task *task;
702 itt_t itt;
703
704 if (session->state == ISCSI_STATE_TERMINATE)
705 return NULL;
706
707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
708 /*
709 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
713 */
714 if (conn->login_task->state != ISCSI_TASK_FREE) {
715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
716 "progress. Cannot start new task.\n");
717 return NULL;
718 }
719
720 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
721 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
722 return NULL;
723 }
724
725 task = conn->login_task;
726 } else {
727 if (session->state != ISCSI_STATE_LOGGED_IN)
728 return NULL;
729
730 if (data_size != 0) {
731 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
732 return NULL;
733 }
734
735 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
736 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
737
738 if (!kfifo_out(&session->cmdpool.queue,
739 (void*)&task, sizeof(void*)))
740 return NULL;
741 }
742 /*
743 * released in complete pdu for task we expect a response for, and
744 * released by the lld when it has transmitted the task for
745 * pdus we do not expect a response for.
746 */
747 atomic_set(&task->refcount, 1);
748 task->conn = conn;
749 task->sc = NULL;
750 INIT_LIST_HEAD(&task->running);
751 task->state = ISCSI_TASK_PENDING;
752
753 if (data_size) {
754 memcpy(task->data, data, data_size);
755 task->data_count = data_size;
756 } else
757 task->data_count = 0;
758
759 if (conn->session->tt->alloc_pdu) {
760 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
761 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
762 "pdu for mgmt task.\n");
763 goto free_task;
764 }
765 }
766
767 itt = task->hdr->itt;
768 task->hdr_len = sizeof(struct iscsi_hdr);
769 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
770
771 if (hdr->itt != RESERVED_ITT) {
772 if (session->tt->parse_pdu_itt)
773 task->hdr->itt = itt;
774 else
775 task->hdr->itt = build_itt(task->itt,
776 task->conn->session->age);
777 }
778
779 if (!ihost->workq) {
780 if (iscsi_prep_mgmt_task(conn, task))
781 goto free_task;
782
783 if (session->tt->xmit_task(task))
784 goto free_task;
785 } else {
786 list_add_tail(&task->running, &conn->mgmtqueue);
787 iscsi_conn_queue_work(conn);
788 }
789
790 return task;
791
792free_task:
793 /* regular RX path uses back_lock */
794 spin_lock_bh(&session->back_lock);
795 __iscsi_put_task(task);
796 spin_unlock_bh(&session->back_lock);
797 return NULL;
798}
799
800int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
801 char *data, uint32_t data_size)
802{
803 struct iscsi_conn *conn = cls_conn->dd_data;
804 struct iscsi_session *session = conn->session;
805 int err = 0;
806
807 spin_lock_bh(&session->frwd_lock);
808 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
809 err = -EPERM;
810 spin_unlock_bh(&session->frwd_lock);
811 return err;
812}
813EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
814
815/**
816 * iscsi_cmd_rsp - SCSI Command Response processing
817 * @conn: iscsi connection
818 * @hdr: iscsi header
819 * @task: scsi command task
820 * @data: cmd data buffer
821 * @datalen: len of buffer
822 *
823 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
824 * then completes the command and task.
825 **/
826static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
827 struct iscsi_task *task, char *data,
828 int datalen)
829{
830 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
831 struct iscsi_session *session = conn->session;
832 struct scsi_cmnd *sc = task->sc;
833
834 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
835 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
836
837 sc->result = (DID_OK << 16) | rhdr->cmd_status;
838
839 if (task->protected) {
840 sector_t sector;
841 u8 ascq;
842
843 /**
844 * Transports that didn't implement check_protection
845 * callback but still published T10-PI support to scsi-mid
846 * deserve this BUG_ON.
847 **/
848 BUG_ON(!session->tt->check_protection);
849
850 ascq = session->tt->check_protection(task, §or);
851 if (ascq) {
852 sc->result = DRIVER_SENSE << 24 |
853 SAM_STAT_CHECK_CONDITION;
854 scsi_build_sense_buffer(1, sc->sense_buffer,
855 ILLEGAL_REQUEST, 0x10, ascq);
856 scsi_set_sense_information(sc->sense_buffer,
857 SCSI_SENSE_BUFFERSIZE,
858 sector);
859 goto out;
860 }
861 }
862
863 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
864 sc->result = DID_ERROR << 16;
865 goto out;
866 }
867
868 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
869 uint16_t senselen;
870
871 if (datalen < 2) {
872invalid_datalen:
873 iscsi_conn_printk(KERN_ERR, conn,
874 "Got CHECK_CONDITION but invalid data "
875 "buffer size of %d\n", datalen);
876 sc->result = DID_BAD_TARGET << 16;
877 goto out;
878 }
879
880 senselen = get_unaligned_be16(data);
881 if (datalen < senselen)
882 goto invalid_datalen;
883
884 memcpy(sc->sense_buffer, data + 2,
885 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
886 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
887 min_t(uint16_t, senselen,
888 SCSI_SENSE_BUFFERSIZE));
889 }
890
891 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
892 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
893 int res_count = be32_to_cpu(rhdr->bi_residual_count);
894
895 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
896 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
897 res_count <= scsi_in(sc)->length))
898 scsi_in(sc)->resid = res_count;
899 else
900 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
901 }
902
903 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
904 ISCSI_FLAG_CMD_OVERFLOW)) {
905 int res_count = be32_to_cpu(rhdr->residual_count);
906
907 if (res_count > 0 &&
908 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
909 res_count <= scsi_bufflen(sc)))
910 /* write side for bidi or uni-io set_resid */
911 scsi_set_resid(sc, res_count);
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
914 }
915out:
916 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
917 sc, sc->result, task->itt);
918 conn->scsirsp_pdus_cnt++;
919 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
920}
921
922/**
923 * iscsi_data_in_rsp - SCSI Data-In Response processing
924 * @conn: iscsi connection
925 * @hdr: iscsi pdu
926 * @task: scsi command task
927 **/
928static void
929iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
930 struct iscsi_task *task)
931{
932 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
933 struct scsi_cmnd *sc = task->sc;
934
935 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
936 return;
937
938 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
939 sc->result = (DID_OK << 16) | rhdr->cmd_status;
940 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
941 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
942 ISCSI_FLAG_DATA_OVERFLOW)) {
943 int res_count = be32_to_cpu(rhdr->residual_count);
944
945 if (res_count > 0 &&
946 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
947 res_count <= scsi_in(sc)->length))
948 scsi_in(sc)->resid = res_count;
949 else
950 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
951 }
952
953 ISCSI_DBG_SESSION(conn->session, "data in with status done "
954 "[sc %p res %d itt 0x%x]\n",
955 sc, sc->result, task->itt);
956 conn->scsirsp_pdus_cnt++;
957 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
958}
959
960static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
961{
962 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
963
964 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
965 conn->tmfrsp_pdus_cnt++;
966
967 if (conn->tmf_state != TMF_QUEUED)
968 return;
969
970 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
971 conn->tmf_state = TMF_SUCCESS;
972 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
973 conn->tmf_state = TMF_NOT_FOUND;
974 else
975 conn->tmf_state = TMF_FAILED;
976 wake_up(&conn->ehwait);
977}
978
979static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
980{
981 struct iscsi_nopout hdr;
982 struct iscsi_task *task;
983
984 if (!rhdr && conn->ping_task)
985 return -EINVAL;
986
987 memset(&hdr, 0, sizeof(struct iscsi_nopout));
988 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
989 hdr.flags = ISCSI_FLAG_CMD_FINAL;
990
991 if (rhdr) {
992 hdr.lun = rhdr->lun;
993 hdr.ttt = rhdr->ttt;
994 hdr.itt = RESERVED_ITT;
995 } else
996 hdr.ttt = RESERVED_ITT;
997
998 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
999 if (!task) {
1000 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1001 return -EIO;
1002 } else if (!rhdr) {
1003 /* only track our nops */
1004 conn->ping_task = task;
1005 conn->last_ping = jiffies;
1006 }
1007
1008 return 0;
1009}
1010
1011static int iscsi_nop_out_rsp(struct iscsi_task *task,
1012 struct iscsi_nopin *nop, char *data, int datalen)
1013{
1014 struct iscsi_conn *conn = task->conn;
1015 int rc = 0;
1016
1017 if (conn->ping_task != task) {
1018 /*
1019 * If this is not in response to one of our
1020 * nops then it must be from userspace.
1021 */
1022 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1023 data, datalen))
1024 rc = ISCSI_ERR_CONN_FAILED;
1025 } else
1026 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1027 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1028 return rc;
1029}
1030
1031static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1032 char *data, int datalen)
1033{
1034 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1035 struct iscsi_hdr rejected_pdu;
1036 int opcode, rc = 0;
1037
1038 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1039
1040 if (ntoh24(reject->dlength) > datalen ||
1041 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1042 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1043 "pdu. Invalid data length (pdu dlength "
1044 "%u, datalen %d\n", ntoh24(reject->dlength),
1045 datalen);
1046 return ISCSI_ERR_PROTO;
1047 }
1048 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1049 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1050
1051 switch (reject->reason) {
1052 case ISCSI_REASON_DATA_DIGEST_ERROR:
1053 iscsi_conn_printk(KERN_ERR, conn,
1054 "pdu (op 0x%x itt 0x%x) rejected "
1055 "due to DataDigest error.\n",
1056 opcode, rejected_pdu.itt);
1057 break;
1058 case ISCSI_REASON_IMM_CMD_REJECT:
1059 iscsi_conn_printk(KERN_ERR, conn,
1060 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1061 "immediate commands.\n",
1062 opcode, rejected_pdu.itt);
1063 /*
1064 * We only send one TMF at a time so if the target could not
1065 * handle it, then it should get fixed (RFC mandates that
1066 * a target can handle one immediate TMF per conn).
1067 *
1068 * For nops-outs, we could have sent more than one if
1069 * the target is sending us lots of nop-ins
1070 */
1071 if (opcode != ISCSI_OP_NOOP_OUT)
1072 return 0;
1073
1074 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1075 /*
1076 * nop-out in response to target's nop-out rejected.
1077 * Just resend.
1078 */
1079 /* In RX path we are under back lock */
1080 spin_unlock(&conn->session->back_lock);
1081 spin_lock(&conn->session->frwd_lock);
1082 iscsi_send_nopout(conn,
1083 (struct iscsi_nopin*)&rejected_pdu);
1084 spin_unlock(&conn->session->frwd_lock);
1085 spin_lock(&conn->session->back_lock);
1086 } else {
1087 struct iscsi_task *task;
1088 /*
1089 * Our nop as ping got dropped. We know the target
1090 * and transport are ok so just clean up
1091 */
1092 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1093 if (!task) {
1094 iscsi_conn_printk(KERN_ERR, conn,
1095 "Invalid pdu reject. Could "
1096 "not lookup rejected task.\n");
1097 rc = ISCSI_ERR_BAD_ITT;
1098 } else
1099 rc = iscsi_nop_out_rsp(task,
1100 (struct iscsi_nopin*)&rejected_pdu,
1101 NULL, 0);
1102 }
1103 break;
1104 default:
1105 iscsi_conn_printk(KERN_ERR, conn,
1106 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1107 "code 0x%x\n", rejected_pdu.opcode,
1108 rejected_pdu.itt, reject->reason);
1109 break;
1110 }
1111 return rc;
1112}
1113
1114/**
1115 * iscsi_itt_to_task - look up task by itt
1116 * @conn: iscsi connection
1117 * @itt: itt
1118 *
1119 * This should be used for mgmt tasks like login and nops, or if
1120 * the LDD's itt space does not include the session age.
1121 *
1122 * The session back_lock must be held.
1123 */
1124struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1125{
1126 struct iscsi_session *session = conn->session;
1127 int i;
1128
1129 if (itt == RESERVED_ITT)
1130 return NULL;
1131
1132 if (session->tt->parse_pdu_itt)
1133 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1134 else
1135 i = get_itt(itt);
1136 if (i >= session->cmds_max)
1137 return NULL;
1138
1139 return session->cmds[i];
1140}
1141EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1142
1143/**
1144 * __iscsi_complete_pdu - complete pdu
1145 * @conn: iscsi conn
1146 * @hdr: iscsi header
1147 * @data: data buffer
1148 * @datalen: len of data buffer
1149 *
1150 * Completes pdu processing by freeing any resources allocated at
1151 * queuecommand or send generic. session back_lock must be held and verify
1152 * itt must have been called.
1153 */
1154int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1155 char *data, int datalen)
1156{
1157 struct iscsi_session *session = conn->session;
1158 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1159 struct iscsi_task *task;
1160 uint32_t itt;
1161
1162 conn->last_recv = jiffies;
1163 rc = iscsi_verify_itt(conn, hdr->itt);
1164 if (rc)
1165 return rc;
1166
1167 if (hdr->itt != RESERVED_ITT)
1168 itt = get_itt(hdr->itt);
1169 else
1170 itt = ~0U;
1171
1172 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1173 opcode, conn->id, itt, datalen);
1174
1175 if (itt == ~0U) {
1176 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1177
1178 switch(opcode) {
1179 case ISCSI_OP_NOOP_IN:
1180 if (datalen) {
1181 rc = ISCSI_ERR_PROTO;
1182 break;
1183 }
1184
1185 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1186 break;
1187
1188 /* In RX path we are under back lock */
1189 spin_unlock(&session->back_lock);
1190 spin_lock(&session->frwd_lock);
1191 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1192 spin_unlock(&session->frwd_lock);
1193 spin_lock(&session->back_lock);
1194 break;
1195 case ISCSI_OP_REJECT:
1196 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1197 break;
1198 case ISCSI_OP_ASYNC_EVENT:
1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1200 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1201 rc = ISCSI_ERR_CONN_FAILED;
1202 break;
1203 default:
1204 rc = ISCSI_ERR_BAD_OPCODE;
1205 break;
1206 }
1207 goto out;
1208 }
1209
1210 switch(opcode) {
1211 case ISCSI_OP_SCSI_CMD_RSP:
1212 case ISCSI_OP_SCSI_DATA_IN:
1213 task = iscsi_itt_to_ctask(conn, hdr->itt);
1214 if (!task)
1215 return ISCSI_ERR_BAD_ITT;
1216 task->last_xfer = jiffies;
1217 break;
1218 case ISCSI_OP_R2T:
1219 /*
1220 * LLD handles R2Ts if they need to.
1221 */
1222 return 0;
1223 case ISCSI_OP_LOGOUT_RSP:
1224 case ISCSI_OP_LOGIN_RSP:
1225 case ISCSI_OP_TEXT_RSP:
1226 case ISCSI_OP_SCSI_TMFUNC_RSP:
1227 case ISCSI_OP_NOOP_IN:
1228 task = iscsi_itt_to_task(conn, hdr->itt);
1229 if (!task)
1230 return ISCSI_ERR_BAD_ITT;
1231 break;
1232 default:
1233 return ISCSI_ERR_BAD_OPCODE;
1234 }
1235
1236 switch(opcode) {
1237 case ISCSI_OP_SCSI_CMD_RSP:
1238 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1239 break;
1240 case ISCSI_OP_SCSI_DATA_IN:
1241 iscsi_data_in_rsp(conn, hdr, task);
1242 break;
1243 case ISCSI_OP_LOGOUT_RSP:
1244 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1245 if (datalen) {
1246 rc = ISCSI_ERR_PROTO;
1247 break;
1248 }
1249 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1250 goto recv_pdu;
1251 case ISCSI_OP_LOGIN_RSP:
1252 case ISCSI_OP_TEXT_RSP:
1253 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1254 /*
1255 * login related PDU's exp_statsn is handled in
1256 * userspace
1257 */
1258 goto recv_pdu;
1259 case ISCSI_OP_SCSI_TMFUNC_RSP:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 if (datalen) {
1262 rc = ISCSI_ERR_PROTO;
1263 break;
1264 }
1265
1266 iscsi_tmf_rsp(conn, hdr);
1267 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1268 break;
1269 case ISCSI_OP_NOOP_IN:
1270 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1271 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1272 rc = ISCSI_ERR_PROTO;
1273 break;
1274 }
1275 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1276
1277 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1278 data, datalen);
1279 break;
1280 default:
1281 rc = ISCSI_ERR_BAD_OPCODE;
1282 break;
1283 }
1284
1285out:
1286 return rc;
1287recv_pdu:
1288 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1289 rc = ISCSI_ERR_CONN_FAILED;
1290 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1291 return rc;
1292}
1293EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1294
1295int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1296 char *data, int datalen)
1297{
1298 int rc;
1299
1300 spin_lock(&conn->session->back_lock);
1301 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1302 spin_unlock(&conn->session->back_lock);
1303 return rc;
1304}
1305EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1306
1307int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1308{
1309 struct iscsi_session *session = conn->session;
1310 int age = 0, i = 0;
1311
1312 if (itt == RESERVED_ITT)
1313 return 0;
1314
1315 if (session->tt->parse_pdu_itt)
1316 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1317 else {
1318 i = get_itt(itt);
1319 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1320 }
1321
1322 if (age != session->age) {
1323 iscsi_conn_printk(KERN_ERR, conn,
1324 "received itt %x expected session age (%x)\n",
1325 (__force u32)itt, session->age);
1326 return ISCSI_ERR_BAD_ITT;
1327 }
1328
1329 if (i >= session->cmds_max) {
1330 iscsi_conn_printk(KERN_ERR, conn,
1331 "received invalid itt index %u (max cmds "
1332 "%u.\n", i, session->cmds_max);
1333 return ISCSI_ERR_BAD_ITT;
1334 }
1335 return 0;
1336}
1337EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1338
1339/**
1340 * iscsi_itt_to_ctask - look up ctask by itt
1341 * @conn: iscsi connection
1342 * @itt: itt
1343 *
1344 * This should be used for cmd tasks.
1345 *
1346 * The session back_lock must be held.
1347 */
1348struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1349{
1350 struct iscsi_task *task;
1351
1352 if (iscsi_verify_itt(conn, itt))
1353 return NULL;
1354
1355 task = iscsi_itt_to_task(conn, itt);
1356 if (!task || !task->sc)
1357 return NULL;
1358
1359 if (task->sc->SCp.phase != conn->session->age) {
1360 iscsi_session_printk(KERN_ERR, conn->session,
1361 "task's session age %d, expected %d\n",
1362 task->sc->SCp.phase, conn->session->age);
1363 return NULL;
1364 }
1365
1366 return task;
1367}
1368EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1369
1370void iscsi_session_failure(struct iscsi_session *session,
1371 enum iscsi_err err)
1372{
1373 struct iscsi_conn *conn;
1374 struct device *dev;
1375
1376 spin_lock_bh(&session->frwd_lock);
1377 conn = session->leadconn;
1378 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1379 spin_unlock_bh(&session->frwd_lock);
1380 return;
1381 }
1382
1383 dev = get_device(&conn->cls_conn->dev);
1384 spin_unlock_bh(&session->frwd_lock);
1385 if (!dev)
1386 return;
1387 /*
1388 * if the host is being removed bypass the connection
1389 * recovery initialization because we are going to kill
1390 * the session.
1391 */
1392 if (err == ISCSI_ERR_INVALID_HOST)
1393 iscsi_conn_error_event(conn->cls_conn, err);
1394 else
1395 iscsi_conn_failure(conn, err);
1396 put_device(dev);
1397}
1398EXPORT_SYMBOL_GPL(iscsi_session_failure);
1399
1400void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1401{
1402 struct iscsi_session *session = conn->session;
1403
1404 spin_lock_bh(&session->frwd_lock);
1405 if (session->state == ISCSI_STATE_FAILED) {
1406 spin_unlock_bh(&session->frwd_lock);
1407 return;
1408 }
1409
1410 if (conn->stop_stage == 0)
1411 session->state = ISCSI_STATE_FAILED;
1412 spin_unlock_bh(&session->frwd_lock);
1413
1414 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1415 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1416 iscsi_conn_error_event(conn->cls_conn, err);
1417}
1418EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1419
1420static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1421{
1422 struct iscsi_session *session = conn->session;
1423
1424 /*
1425 * Check for iSCSI window and take care of CmdSN wrap-around
1426 */
1427 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1428 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1429 "%u MaxCmdSN %u CmdSN %u/%u\n",
1430 session->exp_cmdsn, session->max_cmdsn,
1431 session->cmdsn, session->queued_cmdsn);
1432 return -ENOSPC;
1433 }
1434 return 0;
1435}
1436
1437static int iscsi_xmit_task(struct iscsi_conn *conn)
1438{
1439 struct iscsi_task *task = conn->task;
1440 int rc;
1441
1442 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1443 return -ENODATA;
1444
1445 __iscsi_get_task(task);
1446 spin_unlock_bh(&conn->session->frwd_lock);
1447 rc = conn->session->tt->xmit_task(task);
1448 spin_lock_bh(&conn->session->frwd_lock);
1449 if (!rc) {
1450 /* done with this task */
1451 task->last_xfer = jiffies;
1452 conn->task = NULL;
1453 }
1454 /* regular RX path uses back_lock */
1455 spin_lock(&conn->session->back_lock);
1456 __iscsi_put_task(task);
1457 spin_unlock(&conn->session->back_lock);
1458 return rc;
1459}
1460
1461/**
1462 * iscsi_requeue_task - requeue task to run from session workqueue
1463 * @task: task to requeue
1464 *
1465 * LLDs that need to run a task from the session workqueue should call
1466 * this. The session frwd_lock must be held. This should only be called
1467 * by software drivers.
1468 */
1469void iscsi_requeue_task(struct iscsi_task *task)
1470{
1471 struct iscsi_conn *conn = task->conn;
1472
1473 /*
1474 * this may be on the requeue list already if the xmit_task callout
1475 * is handling the r2ts while we are adding new ones
1476 */
1477 if (list_empty(&task->running))
1478 list_add_tail(&task->running, &conn->requeue);
1479 iscsi_conn_queue_work(conn);
1480}
1481EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1482
1483/**
1484 * iscsi_data_xmit - xmit any command into the scheduled connection
1485 * @conn: iscsi connection
1486 *
1487 * Notes:
1488 * The function can return -EAGAIN in which case the caller must
1489 * re-schedule it again later or recover. '0' return code means
1490 * successful xmit.
1491 **/
1492static int iscsi_data_xmit(struct iscsi_conn *conn)
1493{
1494 struct iscsi_task *task;
1495 int rc = 0;
1496
1497 spin_lock_bh(&conn->session->frwd_lock);
1498 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1499 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1500 spin_unlock_bh(&conn->session->frwd_lock);
1501 return -ENODATA;
1502 }
1503
1504 if (conn->task) {
1505 rc = iscsi_xmit_task(conn);
1506 if (rc)
1507 goto done;
1508 }
1509
1510 /*
1511 * process mgmt pdus like nops before commands since we should
1512 * only have one nop-out as a ping from us and targets should not
1513 * overflow us with nop-ins
1514 */
1515check_mgmt:
1516 while (!list_empty(&conn->mgmtqueue)) {
1517 conn->task = list_entry(conn->mgmtqueue.next,
1518 struct iscsi_task, running);
1519 list_del_init(&conn->task->running);
1520 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1521 /* regular RX path uses back_lock */
1522 spin_lock_bh(&conn->session->back_lock);
1523 __iscsi_put_task(conn->task);
1524 spin_unlock_bh(&conn->session->back_lock);
1525 conn->task = NULL;
1526 continue;
1527 }
1528 rc = iscsi_xmit_task(conn);
1529 if (rc)
1530 goto done;
1531 }
1532
1533 /* process pending command queue */
1534 while (!list_empty(&conn->cmdqueue)) {
1535 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1536 running);
1537 list_del_init(&conn->task->running);
1538 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1539 fail_scsi_task(conn->task, DID_IMM_RETRY);
1540 continue;
1541 }
1542 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1543 if (rc) {
1544 if (rc == -ENOMEM || rc == -EACCES) {
1545 list_add_tail(&conn->task->running,
1546 &conn->cmdqueue);
1547 conn->task = NULL;
1548 goto done;
1549 } else
1550 fail_scsi_task(conn->task, DID_ABORT);
1551 continue;
1552 }
1553 rc = iscsi_xmit_task(conn);
1554 if (rc)
1555 goto done;
1556 /*
1557 * we could continuously get new task requests so
1558 * we need to check the mgmt queue for nops that need to
1559 * be sent to aviod starvation
1560 */
1561 if (!list_empty(&conn->mgmtqueue))
1562 goto check_mgmt;
1563 }
1564
1565 while (!list_empty(&conn->requeue)) {
1566 /*
1567 * we always do fastlogout - conn stop code will clean up.
1568 */
1569 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1570 break;
1571
1572 task = list_entry(conn->requeue.next, struct iscsi_task,
1573 running);
1574 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1575 break;
1576
1577 conn->task = task;
1578 list_del_init(&conn->task->running);
1579 conn->task->state = ISCSI_TASK_RUNNING;
1580 rc = iscsi_xmit_task(conn);
1581 if (rc)
1582 goto done;
1583 if (!list_empty(&conn->mgmtqueue))
1584 goto check_mgmt;
1585 }
1586 spin_unlock_bh(&conn->session->frwd_lock);
1587 return -ENODATA;
1588
1589done:
1590 spin_unlock_bh(&conn->session->frwd_lock);
1591 return rc;
1592}
1593
1594static void iscsi_xmitworker(struct work_struct *work)
1595{
1596 struct iscsi_conn *conn =
1597 container_of(work, struct iscsi_conn, xmitwork);
1598 int rc;
1599 /*
1600 * serialize Xmit worker on a per-connection basis.
1601 */
1602 do {
1603 rc = iscsi_data_xmit(conn);
1604 } while (rc >= 0 || rc == -EAGAIN);
1605}
1606
1607static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1608 struct scsi_cmnd *sc)
1609{
1610 struct iscsi_task *task;
1611
1612 if (!kfifo_out(&conn->session->cmdpool.queue,
1613 (void *) &task, sizeof(void *)))
1614 return NULL;
1615
1616 sc->SCp.phase = conn->session->age;
1617 sc->SCp.ptr = (char *) task;
1618
1619 atomic_set(&task->refcount, 1);
1620 task->state = ISCSI_TASK_PENDING;
1621 task->conn = conn;
1622 task->sc = sc;
1623 task->have_checked_conn = false;
1624 task->last_timeout = jiffies;
1625 task->last_xfer = jiffies;
1626 task->protected = false;
1627 INIT_LIST_HEAD(&task->running);
1628 return task;
1629}
1630
1631enum {
1632 FAILURE_BAD_HOST = 1,
1633 FAILURE_SESSION_FAILED,
1634 FAILURE_SESSION_FREED,
1635 FAILURE_WINDOW_CLOSED,
1636 FAILURE_OOM,
1637 FAILURE_SESSION_TERMINATE,
1638 FAILURE_SESSION_IN_RECOVERY,
1639 FAILURE_SESSION_RECOVERY_TIMEOUT,
1640 FAILURE_SESSION_LOGGING_OUT,
1641 FAILURE_SESSION_NOT_READY,
1642};
1643
1644int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1645{
1646 struct iscsi_cls_session *cls_session;
1647 struct iscsi_host *ihost;
1648 int reason = 0;
1649 struct iscsi_session *session;
1650 struct iscsi_conn *conn;
1651 struct iscsi_task *task = NULL;
1652
1653 sc->result = 0;
1654 sc->SCp.ptr = NULL;
1655
1656 ihost = shost_priv(host);
1657
1658 cls_session = starget_to_session(scsi_target(sc->device));
1659 session = cls_session->dd_data;
1660 spin_lock_bh(&session->frwd_lock);
1661
1662 reason = iscsi_session_chkready(cls_session);
1663 if (reason) {
1664 sc->result = reason;
1665 goto fault;
1666 }
1667
1668 if (session->state != ISCSI_STATE_LOGGED_IN) {
1669 /*
1670 * to handle the race between when we set the recovery state
1671 * and block the session we requeue here (commands could
1672 * be entering our queuecommand while a block is starting
1673 * up because the block code is not locked)
1674 */
1675 switch (session->state) {
1676 case ISCSI_STATE_FAILED:
1677 case ISCSI_STATE_IN_RECOVERY:
1678 reason = FAILURE_SESSION_IN_RECOVERY;
1679 sc->result = DID_IMM_RETRY << 16;
1680 break;
1681 case ISCSI_STATE_LOGGING_OUT:
1682 reason = FAILURE_SESSION_LOGGING_OUT;
1683 sc->result = DID_IMM_RETRY << 16;
1684 break;
1685 case ISCSI_STATE_RECOVERY_FAILED:
1686 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1687 sc->result = DID_TRANSPORT_FAILFAST << 16;
1688 break;
1689 case ISCSI_STATE_TERMINATE:
1690 reason = FAILURE_SESSION_TERMINATE;
1691 sc->result = DID_NO_CONNECT << 16;
1692 break;
1693 default:
1694 reason = FAILURE_SESSION_FREED;
1695 sc->result = DID_NO_CONNECT << 16;
1696 }
1697 goto fault;
1698 }
1699
1700 conn = session->leadconn;
1701 if (!conn) {
1702 reason = FAILURE_SESSION_FREED;
1703 sc->result = DID_NO_CONNECT << 16;
1704 goto fault;
1705 }
1706
1707 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1708 reason = FAILURE_SESSION_IN_RECOVERY;
1709 sc->result = DID_REQUEUE;
1710 goto fault;
1711 }
1712
1713 if (iscsi_check_cmdsn_window_closed(conn)) {
1714 reason = FAILURE_WINDOW_CLOSED;
1715 goto reject;
1716 }
1717
1718 task = iscsi_alloc_task(conn, sc);
1719 if (!task) {
1720 reason = FAILURE_OOM;
1721 goto reject;
1722 }
1723
1724 if (!ihost->workq) {
1725 reason = iscsi_prep_scsi_cmd_pdu(task);
1726 if (reason) {
1727 if (reason == -ENOMEM || reason == -EACCES) {
1728 reason = FAILURE_OOM;
1729 goto prepd_reject;
1730 } else {
1731 sc->result = DID_ABORT << 16;
1732 goto prepd_fault;
1733 }
1734 }
1735 if (session->tt->xmit_task(task)) {
1736 session->cmdsn--;
1737 reason = FAILURE_SESSION_NOT_READY;
1738 goto prepd_reject;
1739 }
1740 } else {
1741 list_add_tail(&task->running, &conn->cmdqueue);
1742 iscsi_conn_queue_work(conn);
1743 }
1744
1745 session->queued_cmdsn++;
1746 spin_unlock_bh(&session->frwd_lock);
1747 return 0;
1748
1749prepd_reject:
1750 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1751reject:
1752 spin_unlock_bh(&session->frwd_lock);
1753 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1754 sc->cmnd[0], reason);
1755 return SCSI_MLQUEUE_TARGET_BUSY;
1756
1757prepd_fault:
1758 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1759fault:
1760 spin_unlock_bh(&session->frwd_lock);
1761 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1762 sc->cmnd[0], reason);
1763 if (!scsi_bidi_cmnd(sc))
1764 scsi_set_resid(sc, scsi_bufflen(sc));
1765 else {
1766 scsi_out(sc)->resid = scsi_out(sc)->length;
1767 scsi_in(sc)->resid = scsi_in(sc)->length;
1768 }
1769 sc->scsi_done(sc);
1770 return 0;
1771}
1772EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1773
1774int iscsi_target_alloc(struct scsi_target *starget)
1775{
1776 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1777 struct iscsi_session *session = cls_session->dd_data;
1778
1779 starget->can_queue = session->scsi_cmds_max;
1780 return 0;
1781}
1782EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1783
1784static void iscsi_tmf_timedout(unsigned long data)
1785{
1786 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1787 struct iscsi_session *session = conn->session;
1788
1789 spin_lock(&session->frwd_lock);
1790 if (conn->tmf_state == TMF_QUEUED) {
1791 conn->tmf_state = TMF_TIMEDOUT;
1792 ISCSI_DBG_EH(session, "tmf timedout\n");
1793 /* unblock eh_abort() */
1794 wake_up(&conn->ehwait);
1795 }
1796 spin_unlock(&session->frwd_lock);
1797}
1798
1799static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1800 struct iscsi_tm *hdr, int age,
1801 int timeout)
1802{
1803 struct iscsi_session *session = conn->session;
1804 struct iscsi_task *task;
1805
1806 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1807 NULL, 0);
1808 if (!task) {
1809 spin_unlock_bh(&session->frwd_lock);
1810 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1811 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1812 spin_lock_bh(&session->frwd_lock);
1813 return -EPERM;
1814 }
1815 conn->tmfcmd_pdus_cnt++;
1816 conn->tmf_timer.expires = timeout * HZ + jiffies;
1817 conn->tmf_timer.function = iscsi_tmf_timedout;
1818 conn->tmf_timer.data = (unsigned long)conn;
1819 add_timer(&conn->tmf_timer);
1820 ISCSI_DBG_EH(session, "tmf set timeout\n");
1821
1822 spin_unlock_bh(&session->frwd_lock);
1823 mutex_unlock(&session->eh_mutex);
1824
1825 /*
1826 * block eh thread until:
1827 *
1828 * 1) tmf response
1829 * 2) tmf timeout
1830 * 3) session is terminated or restarted or userspace has
1831 * given up on recovery
1832 */
1833 wait_event_interruptible(conn->ehwait, age != session->age ||
1834 session->state != ISCSI_STATE_LOGGED_IN ||
1835 conn->tmf_state != TMF_QUEUED);
1836 if (signal_pending(current))
1837 flush_signals(current);
1838 del_timer_sync(&conn->tmf_timer);
1839
1840 mutex_lock(&session->eh_mutex);
1841 spin_lock_bh(&session->frwd_lock);
1842 /* if the session drops it will clean up the task */
1843 if (age != session->age ||
1844 session->state != ISCSI_STATE_LOGGED_IN)
1845 return -ENOTCONN;
1846 return 0;
1847}
1848
1849/*
1850 * Fail commands. session lock held and recv side suspended and xmit
1851 * thread flushed
1852 */
1853static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1854{
1855 struct iscsi_task *task;
1856 int i;
1857
1858 for (i = 0; i < conn->session->cmds_max; i++) {
1859 task = conn->session->cmds[i];
1860 if (!task->sc || task->state == ISCSI_TASK_FREE)
1861 continue;
1862
1863 if (lun != -1 && lun != task->sc->device->lun)
1864 continue;
1865
1866 ISCSI_DBG_SESSION(conn->session,
1867 "failing sc %p itt 0x%x state %d\n",
1868 task->sc, task->itt, task->state);
1869 fail_scsi_task(task, error);
1870 }
1871}
1872
1873/**
1874 * iscsi_suspend_queue - suspend iscsi_queuecommand
1875 * @conn: iscsi conn to stop queueing IO on
1876 *
1877 * This grabs the session frwd_lock to make sure no one is in
1878 * xmit_task/queuecommand, and then sets suspend to prevent
1879 * new commands from being queued. This only needs to be called
1880 * by offload drivers that need to sync a path like ep disconnect
1881 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1882 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1883 */
1884void iscsi_suspend_queue(struct iscsi_conn *conn)
1885{
1886 spin_lock_bh(&conn->session->frwd_lock);
1887 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1888 spin_unlock_bh(&conn->session->frwd_lock);
1889}
1890EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1891
1892/**
1893 * iscsi_suspend_tx - suspend iscsi_data_xmit
1894 * @conn: iscsi conn tp stop processing IO on.
1895 *
1896 * This function sets the suspend bit to prevent iscsi_data_xmit
1897 * from sending new IO, and if work is queued on the xmit thread
1898 * it will wait for it to be completed.
1899 */
1900void iscsi_suspend_tx(struct iscsi_conn *conn)
1901{
1902 struct Scsi_Host *shost = conn->session->host;
1903 struct iscsi_host *ihost = shost_priv(shost);
1904
1905 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1906 if (ihost->workq)
1907 flush_workqueue(ihost->workq);
1908}
1909EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1910
1911static void iscsi_start_tx(struct iscsi_conn *conn)
1912{
1913 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1914 iscsi_conn_queue_work(conn);
1915}
1916
1917/*
1918 * We want to make sure a ping is in flight. It has timed out.
1919 * And we are not busy processing a pdu that is making
1920 * progress but got started before the ping and is taking a while
1921 * to complete so the ping is just stuck behind it in a queue.
1922 */
1923static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1924{
1925 if (conn->ping_task &&
1926 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1927 (conn->ping_timeout * HZ), jiffies))
1928 return 1;
1929 else
1930 return 0;
1931}
1932
1933static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1934{
1935 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1936 struct iscsi_task *task = NULL, *running_task;
1937 struct iscsi_cls_session *cls_session;
1938 struct iscsi_session *session;
1939 struct iscsi_conn *conn;
1940 int i;
1941
1942 cls_session = starget_to_session(scsi_target(sc->device));
1943 session = cls_session->dd_data;
1944
1945 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1946
1947 spin_lock(&session->frwd_lock);
1948 task = (struct iscsi_task *)sc->SCp.ptr;
1949 if (!task) {
1950 /*
1951 * Raced with completion. Blk layer has taken ownership
1952 * so let timeout code complete it now.
1953 */
1954 rc = BLK_EH_HANDLED;
1955 goto done;
1956 }
1957
1958 if (session->state != ISCSI_STATE_LOGGED_IN) {
1959 /*
1960 * We are probably in the middle of iscsi recovery so let
1961 * that complete and handle the error.
1962 */
1963 rc = BLK_EH_RESET_TIMER;
1964 goto done;
1965 }
1966
1967 conn = session->leadconn;
1968 if (!conn) {
1969 /* In the middle of shuting down */
1970 rc = BLK_EH_RESET_TIMER;
1971 goto done;
1972 }
1973
1974 /*
1975 * If we have sent (at least queued to the network layer) a pdu or
1976 * recvd one for the task since the last timeout ask for
1977 * more time. If on the next timeout we have not made progress
1978 * we can check if it is the task or connection when we send the
1979 * nop as a ping.
1980 */
1981 if (time_after(task->last_xfer, task->last_timeout)) {
1982 ISCSI_DBG_EH(session, "Command making progress. Asking "
1983 "scsi-ml for more time to complete. "
1984 "Last data xfer at %lu. Last timeout was at "
1985 "%lu\n.", task->last_xfer, task->last_timeout);
1986 task->have_checked_conn = false;
1987 rc = BLK_EH_RESET_TIMER;
1988 goto done;
1989 }
1990
1991 if (!conn->recv_timeout && !conn->ping_timeout)
1992 goto done;
1993 /*
1994 * if the ping timedout then we are in the middle of cleaning up
1995 * and can let the iscsi eh handle it
1996 */
1997 if (iscsi_has_ping_timed_out(conn)) {
1998 rc = BLK_EH_RESET_TIMER;
1999 goto done;
2000 }
2001
2002 for (i = 0; i < conn->session->cmds_max; i++) {
2003 running_task = conn->session->cmds[i];
2004 if (!running_task->sc || running_task == task ||
2005 running_task->state != ISCSI_TASK_RUNNING)
2006 continue;
2007
2008 /*
2009 * Only check if cmds started before this one have made
2010 * progress, or this could never fail
2011 */
2012 if (time_after(running_task->sc->jiffies_at_alloc,
2013 task->sc->jiffies_at_alloc))
2014 continue;
2015
2016 if (time_after(running_task->last_xfer, task->last_timeout)) {
2017 /*
2018 * This task has not made progress, but a task
2019 * started before us has transferred data since
2020 * we started/last-checked. We could be queueing
2021 * too many tasks or the LU is bad.
2022 *
2023 * If the device is bad the cmds ahead of us on
2024 * other devs will complete, and this loop will
2025 * eventually fail starting the scsi eh.
2026 */
2027 ISCSI_DBG_EH(session, "Command has not made progress "
2028 "but commands ahead of it have. "
2029 "Asking scsi-ml for more time to "
2030 "complete. Our last xfer vs running task "
2031 "last xfer %lu/%lu. Last check %lu.\n",
2032 task->last_xfer, running_task->last_xfer,
2033 task->last_timeout);
2034 rc = BLK_EH_RESET_TIMER;
2035 goto done;
2036 }
2037 }
2038
2039 /* Assumes nop timeout is shorter than scsi cmd timeout */
2040 if (task->have_checked_conn)
2041 goto done;
2042
2043 /*
2044 * Checking the transport already or nop from a cmd timeout still
2045 * running
2046 */
2047 if (conn->ping_task) {
2048 task->have_checked_conn = true;
2049 rc = BLK_EH_RESET_TIMER;
2050 goto done;
2051 }
2052
2053 /* Make sure there is a transport check done */
2054 iscsi_send_nopout(conn, NULL);
2055 task->have_checked_conn = true;
2056 rc = BLK_EH_RESET_TIMER;
2057
2058done:
2059 if (task)
2060 task->last_timeout = jiffies;
2061 spin_unlock(&session->frwd_lock);
2062 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2063 "timer reset" : "nh");
2064 return rc;
2065}
2066
2067static void iscsi_check_transport_timeouts(unsigned long data)
2068{
2069 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2070 struct iscsi_session *session = conn->session;
2071 unsigned long recv_timeout, next_timeout = 0, last_recv;
2072
2073 spin_lock(&session->frwd_lock);
2074 if (session->state != ISCSI_STATE_LOGGED_IN)
2075 goto done;
2076
2077 recv_timeout = conn->recv_timeout;
2078 if (!recv_timeout)
2079 goto done;
2080
2081 recv_timeout *= HZ;
2082 last_recv = conn->last_recv;
2083
2084 if (iscsi_has_ping_timed_out(conn)) {
2085 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2086 "expired, recv timeout %d, last rx %lu, "
2087 "last ping %lu, now %lu\n",
2088 conn->ping_timeout, conn->recv_timeout,
2089 last_recv, conn->last_ping, jiffies);
2090 spin_unlock(&session->frwd_lock);
2091 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2092 return;
2093 }
2094
2095 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2096 /* send a ping to try to provoke some traffic */
2097 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2098 if (iscsi_send_nopout(conn, NULL))
2099 next_timeout = jiffies + (1 * HZ);
2100 else
2101 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2102 } else
2103 next_timeout = last_recv + recv_timeout;
2104
2105 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2106 mod_timer(&conn->transport_timer, next_timeout);
2107done:
2108 spin_unlock(&session->frwd_lock);
2109}
2110
2111static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2112 struct iscsi_tm *hdr)
2113{
2114 memset(hdr, 0, sizeof(*hdr));
2115 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2116 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2117 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2118 hdr->lun = task->lun;
2119 hdr->rtt = task->hdr_itt;
2120 hdr->refcmdsn = task->cmdsn;
2121}
2122
2123int iscsi_eh_abort(struct scsi_cmnd *sc)
2124{
2125 struct iscsi_cls_session *cls_session;
2126 struct iscsi_session *session;
2127 struct iscsi_conn *conn;
2128 struct iscsi_task *task;
2129 struct iscsi_tm *hdr;
2130 int rc, age;
2131
2132 cls_session = starget_to_session(scsi_target(sc->device));
2133 session = cls_session->dd_data;
2134
2135 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2136
2137 mutex_lock(&session->eh_mutex);
2138 spin_lock_bh(&session->frwd_lock);
2139 /*
2140 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2141 * got the command.
2142 */
2143 if (!sc->SCp.ptr) {
2144 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2145 "it completed.\n");
2146 spin_unlock_bh(&session->frwd_lock);
2147 mutex_unlock(&session->eh_mutex);
2148 return SUCCESS;
2149 }
2150
2151 /*
2152 * If we are not logged in or we have started a new session
2153 * then let the host reset code handle this
2154 */
2155 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2156 sc->SCp.phase != session->age) {
2157 spin_unlock_bh(&session->frwd_lock);
2158 mutex_unlock(&session->eh_mutex);
2159 ISCSI_DBG_EH(session, "failing abort due to dropped "
2160 "session.\n");
2161 return FAILED;
2162 }
2163
2164 conn = session->leadconn;
2165 conn->eh_abort_cnt++;
2166 age = session->age;
2167
2168 task = (struct iscsi_task *)sc->SCp.ptr;
2169 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2170 sc, task->itt);
2171
2172 /* task completed before time out */
2173 if (!task->sc) {
2174 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2175 goto success;
2176 }
2177
2178 if (task->state == ISCSI_TASK_PENDING) {
2179 fail_scsi_task(task, DID_ABORT);
2180 goto success;
2181 }
2182
2183 /* only have one tmf outstanding at a time */
2184 if (conn->tmf_state != TMF_INITIAL)
2185 goto failed;
2186 conn->tmf_state = TMF_QUEUED;
2187
2188 hdr = &conn->tmhdr;
2189 iscsi_prep_abort_task_pdu(task, hdr);
2190
2191 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2192 rc = FAILED;
2193 goto failed;
2194 }
2195
2196 switch (conn->tmf_state) {
2197 case TMF_SUCCESS:
2198 spin_unlock_bh(&session->frwd_lock);
2199 /*
2200 * stop tx side incase the target had sent a abort rsp but
2201 * the initiator was still writing out data.
2202 */
2203 iscsi_suspend_tx(conn);
2204 /*
2205 * we do not stop the recv side because targets have been
2206 * good and have never sent us a successful tmf response
2207 * then sent more data for the cmd.
2208 */
2209 spin_lock_bh(&session->frwd_lock);
2210 fail_scsi_task(task, DID_ABORT);
2211 conn->tmf_state = TMF_INITIAL;
2212 memset(hdr, 0, sizeof(*hdr));
2213 spin_unlock_bh(&session->frwd_lock);
2214 iscsi_start_tx(conn);
2215 goto success_unlocked;
2216 case TMF_TIMEDOUT:
2217 spin_unlock_bh(&session->frwd_lock);
2218 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2219 goto failed_unlocked;
2220 case TMF_NOT_FOUND:
2221 if (!sc->SCp.ptr) {
2222 conn->tmf_state = TMF_INITIAL;
2223 memset(hdr, 0, sizeof(*hdr));
2224 /* task completed before tmf abort response */
2225 ISCSI_DBG_EH(session, "sc completed while abort in "
2226 "progress\n");
2227 goto success;
2228 }
2229 /* fall through */
2230 default:
2231 conn->tmf_state = TMF_INITIAL;
2232 goto failed;
2233 }
2234
2235success:
2236 spin_unlock_bh(&session->frwd_lock);
2237success_unlocked:
2238 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2239 sc, task->itt);
2240 mutex_unlock(&session->eh_mutex);
2241 return SUCCESS;
2242
2243failed:
2244 spin_unlock_bh(&session->frwd_lock);
2245failed_unlocked:
2246 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2247 task ? task->itt : 0);
2248 mutex_unlock(&session->eh_mutex);
2249 return FAILED;
2250}
2251EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2252
2253static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2254{
2255 memset(hdr, 0, sizeof(*hdr));
2256 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2257 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2258 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2259 int_to_scsilun(sc->device->lun, &hdr->lun);
2260 hdr->rtt = RESERVED_ITT;
2261}
2262
2263int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2264{
2265 struct iscsi_cls_session *cls_session;
2266 struct iscsi_session *session;
2267 struct iscsi_conn *conn;
2268 struct iscsi_tm *hdr;
2269 int rc = FAILED;
2270
2271 cls_session = starget_to_session(scsi_target(sc->device));
2272 session = cls_session->dd_data;
2273
2274 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2275 sc->device->lun);
2276
2277 mutex_lock(&session->eh_mutex);
2278 spin_lock_bh(&session->frwd_lock);
2279 /*
2280 * Just check if we are not logged in. We cannot check for
2281 * the phase because the reset could come from a ioctl.
2282 */
2283 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2284 goto unlock;
2285 conn = session->leadconn;
2286
2287 /* only have one tmf outstanding at a time */
2288 if (conn->tmf_state != TMF_INITIAL)
2289 goto unlock;
2290 conn->tmf_state = TMF_QUEUED;
2291
2292 hdr = &conn->tmhdr;
2293 iscsi_prep_lun_reset_pdu(sc, hdr);
2294
2295 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2296 session->lu_reset_timeout)) {
2297 rc = FAILED;
2298 goto unlock;
2299 }
2300
2301 switch (conn->tmf_state) {
2302 case TMF_SUCCESS:
2303 break;
2304 case TMF_TIMEDOUT:
2305 spin_unlock_bh(&session->frwd_lock);
2306 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2307 goto done;
2308 default:
2309 conn->tmf_state = TMF_INITIAL;
2310 goto unlock;
2311 }
2312
2313 rc = SUCCESS;
2314 spin_unlock_bh(&session->frwd_lock);
2315
2316 iscsi_suspend_tx(conn);
2317
2318 spin_lock_bh(&session->frwd_lock);
2319 memset(hdr, 0, sizeof(*hdr));
2320 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2321 conn->tmf_state = TMF_INITIAL;
2322 spin_unlock_bh(&session->frwd_lock);
2323
2324 iscsi_start_tx(conn);
2325 goto done;
2326
2327unlock:
2328 spin_unlock_bh(&session->frwd_lock);
2329done:
2330 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2331 rc == SUCCESS ? "SUCCESS" : "FAILED");
2332 mutex_unlock(&session->eh_mutex);
2333 return rc;
2334}
2335EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2336
2337void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2338{
2339 struct iscsi_session *session = cls_session->dd_data;
2340
2341 spin_lock_bh(&session->frwd_lock);
2342 if (session->state != ISCSI_STATE_LOGGED_IN) {
2343 session->state = ISCSI_STATE_RECOVERY_FAILED;
2344 if (session->leadconn)
2345 wake_up(&session->leadconn->ehwait);
2346 }
2347 spin_unlock_bh(&session->frwd_lock);
2348}
2349EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2350
2351/**
2352 * iscsi_eh_session_reset - drop session and attempt relogin
2353 * @sc: scsi command
2354 *
2355 * This function will wait for a relogin, session termination from
2356 * userspace, or a recovery/replacement timeout.
2357 */
2358int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2359{
2360 struct iscsi_cls_session *cls_session;
2361 struct iscsi_session *session;
2362 struct iscsi_conn *conn;
2363
2364 cls_session = starget_to_session(scsi_target(sc->device));
2365 session = cls_session->dd_data;
2366 conn = session->leadconn;
2367
2368 mutex_lock(&session->eh_mutex);
2369 spin_lock_bh(&session->frwd_lock);
2370 if (session->state == ISCSI_STATE_TERMINATE) {
2371failed:
2372 ISCSI_DBG_EH(session,
2373 "failing session reset: Could not log back into "
2374 "%s, %s [age %d]\n", session->targetname,
2375 conn->persistent_address, session->age);
2376 spin_unlock_bh(&session->frwd_lock);
2377 mutex_unlock(&session->eh_mutex);
2378 return FAILED;
2379 }
2380
2381 spin_unlock_bh(&session->frwd_lock);
2382 mutex_unlock(&session->eh_mutex);
2383 /*
2384 * we drop the lock here but the leadconn cannot be destoyed while
2385 * we are in the scsi eh
2386 */
2387 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2388
2389 ISCSI_DBG_EH(session, "wait for relogin\n");
2390 wait_event_interruptible(conn->ehwait,
2391 session->state == ISCSI_STATE_TERMINATE ||
2392 session->state == ISCSI_STATE_LOGGED_IN ||
2393 session->state == ISCSI_STATE_RECOVERY_FAILED);
2394 if (signal_pending(current))
2395 flush_signals(current);
2396
2397 mutex_lock(&session->eh_mutex);
2398 spin_lock_bh(&session->frwd_lock);
2399 if (session->state == ISCSI_STATE_LOGGED_IN) {
2400 ISCSI_DBG_EH(session,
2401 "session reset succeeded for %s,%s\n",
2402 session->targetname, conn->persistent_address);
2403 } else
2404 goto failed;
2405 spin_unlock_bh(&session->frwd_lock);
2406 mutex_unlock(&session->eh_mutex);
2407 return SUCCESS;
2408}
2409EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2410
2411static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2412{
2413 memset(hdr, 0, sizeof(*hdr));
2414 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2415 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2416 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2417 hdr->rtt = RESERVED_ITT;
2418}
2419
2420/**
2421 * iscsi_eh_target_reset - reset target
2422 * @sc: scsi command
2423 *
2424 * This will attempt to send a warm target reset.
2425 */
2426int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2427{
2428 struct iscsi_cls_session *cls_session;
2429 struct iscsi_session *session;
2430 struct iscsi_conn *conn;
2431 struct iscsi_tm *hdr;
2432 int rc = FAILED;
2433
2434 cls_session = starget_to_session(scsi_target(sc->device));
2435 session = cls_session->dd_data;
2436
2437 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2438 session->targetname);
2439
2440 mutex_lock(&session->eh_mutex);
2441 spin_lock_bh(&session->frwd_lock);
2442 /*
2443 * Just check if we are not logged in. We cannot check for
2444 * the phase because the reset could come from a ioctl.
2445 */
2446 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2447 goto unlock;
2448 conn = session->leadconn;
2449
2450 /* only have one tmf outstanding at a time */
2451 if (conn->tmf_state != TMF_INITIAL)
2452 goto unlock;
2453 conn->tmf_state = TMF_QUEUED;
2454
2455 hdr = &conn->tmhdr;
2456 iscsi_prep_tgt_reset_pdu(sc, hdr);
2457
2458 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2459 session->tgt_reset_timeout)) {
2460 rc = FAILED;
2461 goto unlock;
2462 }
2463
2464 switch (conn->tmf_state) {
2465 case TMF_SUCCESS:
2466 break;
2467 case TMF_TIMEDOUT:
2468 spin_unlock_bh(&session->frwd_lock);
2469 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2470 goto done;
2471 default:
2472 conn->tmf_state = TMF_INITIAL;
2473 goto unlock;
2474 }
2475
2476 rc = SUCCESS;
2477 spin_unlock_bh(&session->frwd_lock);
2478
2479 iscsi_suspend_tx(conn);
2480
2481 spin_lock_bh(&session->frwd_lock);
2482 memset(hdr, 0, sizeof(*hdr));
2483 fail_scsi_tasks(conn, -1, DID_ERROR);
2484 conn->tmf_state = TMF_INITIAL;
2485 spin_unlock_bh(&session->frwd_lock);
2486
2487 iscsi_start_tx(conn);
2488 goto done;
2489
2490unlock:
2491 spin_unlock_bh(&session->frwd_lock);
2492done:
2493 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2494 rc == SUCCESS ? "SUCCESS" : "FAILED");
2495 mutex_unlock(&session->eh_mutex);
2496 return rc;
2497}
2498EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2499
2500/**
2501 * iscsi_eh_recover_target - reset target and possibly the session
2502 * @sc: scsi command
2503 *
2504 * This will attempt to send a warm target reset. If that fails,
2505 * we will escalate to ERL0 session recovery.
2506 */
2507int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2508{
2509 int rc;
2510
2511 rc = iscsi_eh_target_reset(sc);
2512 if (rc == FAILED)
2513 rc = iscsi_eh_session_reset(sc);
2514 return rc;
2515}
2516EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2517
2518/*
2519 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2520 * should be accessed via kfifo_{get,put} on q->queue.
2521 * Optionally, the caller can obtain the array of object pointers
2522 * by passing in a non-NULL @items pointer
2523 */
2524int
2525iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2526{
2527 int i, num_arrays = 1;
2528
2529 memset(q, 0, sizeof(*q));
2530
2531 q->max = max;
2532
2533 /* If the user passed an items pointer, he wants a copy of
2534 * the array. */
2535 if (items)
2536 num_arrays++;
2537 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2538 if (q->pool == NULL)
2539 return -ENOMEM;
2540
2541 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2542
2543 for (i = 0; i < max; i++) {
2544 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2545 if (q->pool[i] == NULL) {
2546 q->max = i;
2547 goto enomem;
2548 }
2549 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2550 }
2551
2552 if (items) {
2553 *items = q->pool + max;
2554 memcpy(*items, q->pool, max * sizeof(void *));
2555 }
2556
2557 return 0;
2558
2559enomem:
2560 iscsi_pool_free(q);
2561 return -ENOMEM;
2562}
2563EXPORT_SYMBOL_GPL(iscsi_pool_init);
2564
2565void iscsi_pool_free(struct iscsi_pool *q)
2566{
2567 int i;
2568
2569 for (i = 0; i < q->max; i++)
2570 kfree(q->pool[i]);
2571 kfree(q->pool);
2572}
2573EXPORT_SYMBOL_GPL(iscsi_pool_free);
2574
2575/**
2576 * iscsi_host_add - add host to system
2577 * @shost: scsi host
2578 * @pdev: parent device
2579 *
2580 * This should be called by partial offload and software iscsi drivers
2581 * to add a host to the system.
2582 */
2583int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2584{
2585 if (!shost->can_queue)
2586 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2587
2588 if (!shost->cmd_per_lun)
2589 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2590
2591 if (!shost->transportt->eh_timed_out)
2592 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2593 return scsi_add_host(shost, pdev);
2594}
2595EXPORT_SYMBOL_GPL(iscsi_host_add);
2596
2597/**
2598 * iscsi_host_alloc - allocate a host and driver data
2599 * @sht: scsi host template
2600 * @dd_data_size: driver host data size
2601 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2602 *
2603 * This should be called by partial offload and software iscsi drivers.
2604 * To access the driver specific memory use the iscsi_host_priv() macro.
2605 */
2606struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2607 int dd_data_size, bool xmit_can_sleep)
2608{
2609 struct Scsi_Host *shost;
2610 struct iscsi_host *ihost;
2611
2612 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2613 if (!shost)
2614 return NULL;
2615 ihost = shost_priv(shost);
2616
2617 if (xmit_can_sleep) {
2618 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2619 "iscsi_q_%d", shost->host_no);
2620 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2621 if (!ihost->workq)
2622 goto free_host;
2623 }
2624
2625 spin_lock_init(&ihost->lock);
2626 ihost->state = ISCSI_HOST_SETUP;
2627 ihost->num_sessions = 0;
2628 init_waitqueue_head(&ihost->session_removal_wq);
2629 return shost;
2630
2631free_host:
2632 scsi_host_put(shost);
2633 return NULL;
2634}
2635EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2636
2637static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2638{
2639 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2640}
2641
2642/**
2643 * iscsi_host_remove - remove host and sessions
2644 * @shost: scsi host
2645 *
2646 * If there are any sessions left, this will initiate the removal and wait
2647 * for the completion.
2648 */
2649void iscsi_host_remove(struct Scsi_Host *shost)
2650{
2651 struct iscsi_host *ihost = shost_priv(shost);
2652 unsigned long flags;
2653
2654 spin_lock_irqsave(&ihost->lock, flags);
2655 ihost->state = ISCSI_HOST_REMOVED;
2656 spin_unlock_irqrestore(&ihost->lock, flags);
2657
2658 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2659 wait_event_interruptible(ihost->session_removal_wq,
2660 ihost->num_sessions == 0);
2661 if (signal_pending(current))
2662 flush_signals(current);
2663
2664 scsi_remove_host(shost);
2665 if (ihost->workq)
2666 destroy_workqueue(ihost->workq);
2667}
2668EXPORT_SYMBOL_GPL(iscsi_host_remove);
2669
2670void iscsi_host_free(struct Scsi_Host *shost)
2671{
2672 struct iscsi_host *ihost = shost_priv(shost);
2673
2674 kfree(ihost->netdev);
2675 kfree(ihost->hwaddress);
2676 kfree(ihost->initiatorname);
2677 scsi_host_put(shost);
2678}
2679EXPORT_SYMBOL_GPL(iscsi_host_free);
2680
2681static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2682{
2683 struct iscsi_host *ihost = shost_priv(shost);
2684 unsigned long flags;
2685
2686 shost = scsi_host_get(shost);
2687 if (!shost) {
2688 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2689 "of session teardown event because host already "
2690 "removed.\n");
2691 return;
2692 }
2693
2694 spin_lock_irqsave(&ihost->lock, flags);
2695 ihost->num_sessions--;
2696 if (ihost->num_sessions == 0)
2697 wake_up(&ihost->session_removal_wq);
2698 spin_unlock_irqrestore(&ihost->lock, flags);
2699 scsi_host_put(shost);
2700}
2701
2702/**
2703 * iscsi_session_setup - create iscsi cls session and host and session
2704 * @iscsit: iscsi transport template
2705 * @shost: scsi host
2706 * @cmds_max: session can queue
2707 * @cmd_task_size: LLD task private data size
2708 * @initial_cmdsn: initial CmdSN
2709 *
2710 * This can be used by software iscsi_transports that allocate
2711 * a session per scsi host.
2712 *
2713 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2714 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2715 * for nop handling and login/logout requests.
2716 */
2717struct iscsi_cls_session *
2718iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2719 uint16_t cmds_max, int dd_size, int cmd_task_size,
2720 uint32_t initial_cmdsn, unsigned int id)
2721{
2722 struct iscsi_host *ihost = shost_priv(shost);
2723 struct iscsi_session *session;
2724 struct iscsi_cls_session *cls_session;
2725 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2726 unsigned long flags;
2727
2728 spin_lock_irqsave(&ihost->lock, flags);
2729 if (ihost->state == ISCSI_HOST_REMOVED) {
2730 spin_unlock_irqrestore(&ihost->lock, flags);
2731 return NULL;
2732 }
2733 ihost->num_sessions++;
2734 spin_unlock_irqrestore(&ihost->lock, flags);
2735
2736 if (!total_cmds)
2737 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2738 /*
2739 * The iscsi layer needs some tasks for nop handling and tmfs,
2740 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2741 * + 1 command for scsi IO.
2742 */
2743 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2744 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2745 "must be a power of two that is at least %d.\n",
2746 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2747 goto dec_session_count;
2748 }
2749
2750 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2751 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2752 "must be a power of 2 less than or equal to %d.\n",
2753 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2754 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2755 }
2756
2757 if (!is_power_of_2(total_cmds)) {
2758 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2759 "must be a power of 2.\n", total_cmds);
2760 total_cmds = rounddown_pow_of_two(total_cmds);
2761 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2762 return NULL;
2763 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2764 total_cmds);
2765 }
2766 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2767
2768 cls_session = iscsi_alloc_session(shost, iscsit,
2769 sizeof(struct iscsi_session) +
2770 dd_size);
2771 if (!cls_session)
2772 goto dec_session_count;
2773 session = cls_session->dd_data;
2774 session->cls_session = cls_session;
2775 session->host = shost;
2776 session->state = ISCSI_STATE_FREE;
2777 session->fast_abort = 1;
2778 session->tgt_reset_timeout = 30;
2779 session->lu_reset_timeout = 15;
2780 session->abort_timeout = 10;
2781 session->scsi_cmds_max = scsi_cmds;
2782 session->cmds_max = total_cmds;
2783 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2784 session->exp_cmdsn = initial_cmdsn + 1;
2785 session->max_cmdsn = initial_cmdsn + 1;
2786 session->max_r2t = 1;
2787 session->tt = iscsit;
2788 session->dd_data = cls_session->dd_data + sizeof(*session);
2789
2790 mutex_init(&session->eh_mutex);
2791 spin_lock_init(&session->frwd_lock);
2792 spin_lock_init(&session->back_lock);
2793
2794 /* initialize SCSI PDU commands pool */
2795 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2796 (void***)&session->cmds,
2797 cmd_task_size + sizeof(struct iscsi_task)))
2798 goto cmdpool_alloc_fail;
2799
2800 /* pre-format cmds pool with ITT */
2801 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2802 struct iscsi_task *task = session->cmds[cmd_i];
2803
2804 if (cmd_task_size)
2805 task->dd_data = &task[1];
2806 task->itt = cmd_i;
2807 task->state = ISCSI_TASK_FREE;
2808 INIT_LIST_HEAD(&task->running);
2809 }
2810
2811 if (!try_module_get(iscsit->owner))
2812 goto module_get_fail;
2813
2814 if (iscsi_add_session(cls_session, id))
2815 goto cls_session_fail;
2816
2817 return cls_session;
2818
2819cls_session_fail:
2820 module_put(iscsit->owner);
2821module_get_fail:
2822 iscsi_pool_free(&session->cmdpool);
2823cmdpool_alloc_fail:
2824 iscsi_free_session(cls_session);
2825dec_session_count:
2826 iscsi_host_dec_session_cnt(shost);
2827 return NULL;
2828}
2829EXPORT_SYMBOL_GPL(iscsi_session_setup);
2830
2831/**
2832 * iscsi_session_teardown - destroy session, host, and cls_session
2833 * @cls_session: iscsi session
2834 *
2835 * The driver must have called iscsi_remove_session before
2836 * calling this.
2837 */
2838void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2839{
2840 struct iscsi_session *session = cls_session->dd_data;
2841 struct module *owner = cls_session->transport->owner;
2842 struct Scsi_Host *shost = session->host;
2843
2844 iscsi_pool_free(&session->cmdpool);
2845
2846 kfree(session->password);
2847 kfree(session->password_in);
2848 kfree(session->username);
2849 kfree(session->username_in);
2850 kfree(session->targetname);
2851 kfree(session->targetalias);
2852 kfree(session->initiatorname);
2853 kfree(session->boot_root);
2854 kfree(session->boot_nic);
2855 kfree(session->boot_target);
2856 kfree(session->ifacename);
2857 kfree(session->portal_type);
2858 kfree(session->discovery_parent_type);
2859
2860 iscsi_destroy_session(cls_session);
2861 iscsi_host_dec_session_cnt(shost);
2862 module_put(owner);
2863}
2864EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2865
2866/**
2867 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2868 * @cls_session: iscsi_cls_session
2869 * @dd_size: private driver data size
2870 * @conn_idx: cid
2871 */
2872struct iscsi_cls_conn *
2873iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2874 uint32_t conn_idx)
2875{
2876 struct iscsi_session *session = cls_session->dd_data;
2877 struct iscsi_conn *conn;
2878 struct iscsi_cls_conn *cls_conn;
2879 char *data;
2880
2881 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2882 conn_idx);
2883 if (!cls_conn)
2884 return NULL;
2885 conn = cls_conn->dd_data;
2886 memset(conn, 0, sizeof(*conn) + dd_size);
2887
2888 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2889 conn->session = session;
2890 conn->cls_conn = cls_conn;
2891 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2892 conn->id = conn_idx;
2893 conn->exp_statsn = 0;
2894 conn->tmf_state = TMF_INITIAL;
2895
2896 init_timer(&conn->transport_timer);
2897 conn->transport_timer.data = (unsigned long)conn;
2898 conn->transport_timer.function = iscsi_check_transport_timeouts;
2899
2900 INIT_LIST_HEAD(&conn->mgmtqueue);
2901 INIT_LIST_HEAD(&conn->cmdqueue);
2902 INIT_LIST_HEAD(&conn->requeue);
2903 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2904
2905 /* allocate login_task used for the login/text sequences */
2906 spin_lock_bh(&session->frwd_lock);
2907 if (!kfifo_out(&session->cmdpool.queue,
2908 (void*)&conn->login_task,
2909 sizeof(void*))) {
2910 spin_unlock_bh(&session->frwd_lock);
2911 goto login_task_alloc_fail;
2912 }
2913 spin_unlock_bh(&session->frwd_lock);
2914
2915 data = (char *) __get_free_pages(GFP_KERNEL,
2916 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2917 if (!data)
2918 goto login_task_data_alloc_fail;
2919 conn->login_task->data = conn->data = data;
2920
2921 init_timer(&conn->tmf_timer);
2922 init_waitqueue_head(&conn->ehwait);
2923
2924 return cls_conn;
2925
2926login_task_data_alloc_fail:
2927 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2928 sizeof(void*));
2929login_task_alloc_fail:
2930 iscsi_destroy_conn(cls_conn);
2931 return NULL;
2932}
2933EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2934
2935/**
2936 * iscsi_conn_teardown - teardown iscsi connection
2937 * cls_conn: iscsi class connection
2938 *
2939 * TODO: we may need to make this into a two step process
2940 * like scsi-mls remove + put host
2941 */
2942void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2943{
2944 struct iscsi_conn *conn = cls_conn->dd_data;
2945 struct iscsi_session *session = conn->session;
2946
2947 del_timer_sync(&conn->transport_timer);
2948
2949 mutex_lock(&session->eh_mutex);
2950 spin_lock_bh(&session->frwd_lock);
2951 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2952 if (session->leadconn == conn) {
2953 /*
2954 * leading connection? then give up on recovery.
2955 */
2956 session->state = ISCSI_STATE_TERMINATE;
2957 wake_up(&conn->ehwait);
2958 }
2959 spin_unlock_bh(&session->frwd_lock);
2960
2961 /* flush queued up work because we free the connection below */
2962 iscsi_suspend_tx(conn);
2963
2964 spin_lock_bh(&session->frwd_lock);
2965 free_pages((unsigned long) conn->data,
2966 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2967 kfree(conn->persistent_address);
2968 kfree(conn->local_ipaddr);
2969 /* regular RX path uses back_lock */
2970 spin_lock_bh(&session->back_lock);
2971 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2972 sizeof(void*));
2973 spin_unlock_bh(&session->back_lock);
2974 if (session->leadconn == conn)
2975 session->leadconn = NULL;
2976 spin_unlock_bh(&session->frwd_lock);
2977 mutex_unlock(&session->eh_mutex);
2978
2979 iscsi_destroy_conn(cls_conn);
2980}
2981EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2982
2983int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2984{
2985 struct iscsi_conn *conn = cls_conn->dd_data;
2986 struct iscsi_session *session = conn->session;
2987
2988 if (!session) {
2989 iscsi_conn_printk(KERN_ERR, conn,
2990 "can't start unbound connection\n");
2991 return -EPERM;
2992 }
2993
2994 if ((session->imm_data_en || !session->initial_r2t_en) &&
2995 session->first_burst > session->max_burst) {
2996 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2997 "first_burst %d max_burst %d\n",
2998 session->first_burst, session->max_burst);
2999 return -EINVAL;
3000 }
3001
3002 if (conn->ping_timeout && !conn->recv_timeout) {
3003 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3004 "zero. Using 5 seconds\n.");
3005 conn->recv_timeout = 5;
3006 }
3007
3008 if (conn->recv_timeout && !conn->ping_timeout) {
3009 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3010 "zero. Using 5 seconds.\n");
3011 conn->ping_timeout = 5;
3012 }
3013
3014 spin_lock_bh(&session->frwd_lock);
3015 conn->c_stage = ISCSI_CONN_STARTED;
3016 session->state = ISCSI_STATE_LOGGED_IN;
3017 session->queued_cmdsn = session->cmdsn;
3018
3019 conn->last_recv = jiffies;
3020 conn->last_ping = jiffies;
3021 if (conn->recv_timeout && conn->ping_timeout)
3022 mod_timer(&conn->transport_timer,
3023 jiffies + (conn->recv_timeout * HZ));
3024
3025 switch(conn->stop_stage) {
3026 case STOP_CONN_RECOVER:
3027 /*
3028 * unblock eh_abort() if it is blocked. re-try all
3029 * commands after successful recovery
3030 */
3031 conn->stop_stage = 0;
3032 conn->tmf_state = TMF_INITIAL;
3033 session->age++;
3034 if (session->age == 16)
3035 session->age = 0;
3036 break;
3037 case STOP_CONN_TERM:
3038 conn->stop_stage = 0;
3039 break;
3040 default:
3041 break;
3042 }
3043 spin_unlock_bh(&session->frwd_lock);
3044
3045 iscsi_unblock_session(session->cls_session);
3046 wake_up(&conn->ehwait);
3047 return 0;
3048}
3049EXPORT_SYMBOL_GPL(iscsi_conn_start);
3050
3051static void
3052fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3053{
3054 struct iscsi_task *task;
3055 int i, state;
3056
3057 for (i = 0; i < conn->session->cmds_max; i++) {
3058 task = conn->session->cmds[i];
3059 if (task->sc)
3060 continue;
3061
3062 if (task->state == ISCSI_TASK_FREE)
3063 continue;
3064
3065 ISCSI_DBG_SESSION(conn->session,
3066 "failing mgmt itt 0x%x state %d\n",
3067 task->itt, task->state);
3068 state = ISCSI_TASK_ABRT_SESS_RECOV;
3069 if (task->state == ISCSI_TASK_PENDING)
3070 state = ISCSI_TASK_COMPLETED;
3071 iscsi_complete_task(task, state);
3072
3073 }
3074}
3075
3076static void iscsi_start_session_recovery(struct iscsi_session *session,
3077 struct iscsi_conn *conn, int flag)
3078{
3079 int old_stop_stage;
3080
3081 mutex_lock(&session->eh_mutex);
3082 spin_lock_bh(&session->frwd_lock);
3083 if (conn->stop_stage == STOP_CONN_TERM) {
3084 spin_unlock_bh(&session->frwd_lock);
3085 mutex_unlock(&session->eh_mutex);
3086 return;
3087 }
3088
3089 /*
3090 * When this is called for the in_login state, we only want to clean
3091 * up the login task and connection. We do not need to block and set
3092 * the recovery state again
3093 */
3094 if (flag == STOP_CONN_TERM)
3095 session->state = ISCSI_STATE_TERMINATE;
3096 else if (conn->stop_stage != STOP_CONN_RECOVER)
3097 session->state = ISCSI_STATE_IN_RECOVERY;
3098
3099 old_stop_stage = conn->stop_stage;
3100 conn->stop_stage = flag;
3101 spin_unlock_bh(&session->frwd_lock);
3102
3103 del_timer_sync(&conn->transport_timer);
3104 iscsi_suspend_tx(conn);
3105
3106 spin_lock_bh(&session->frwd_lock);
3107 conn->c_stage = ISCSI_CONN_STOPPED;
3108 spin_unlock_bh(&session->frwd_lock);
3109
3110 /*
3111 * for connection level recovery we should not calculate
3112 * header digest. conn->hdr_size used for optimization
3113 * in hdr_extract() and will be re-negotiated at
3114 * set_param() time.
3115 */
3116 if (flag == STOP_CONN_RECOVER) {
3117 conn->hdrdgst_en = 0;
3118 conn->datadgst_en = 0;
3119 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3120 old_stop_stage != STOP_CONN_RECOVER) {
3121 ISCSI_DBG_SESSION(session, "blocking session\n");
3122 iscsi_block_session(session->cls_session);
3123 }
3124 }
3125
3126 /*
3127 * flush queues.
3128 */
3129 spin_lock_bh(&session->frwd_lock);
3130 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3131 fail_mgmt_tasks(session, conn);
3132 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3133 spin_unlock_bh(&session->frwd_lock);
3134 mutex_unlock(&session->eh_mutex);
3135}
3136
3137void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3138{
3139 struct iscsi_conn *conn = cls_conn->dd_data;
3140 struct iscsi_session *session = conn->session;
3141
3142 switch (flag) {
3143 case STOP_CONN_RECOVER:
3144 case STOP_CONN_TERM:
3145 iscsi_start_session_recovery(session, conn, flag);
3146 break;
3147 default:
3148 iscsi_conn_printk(KERN_ERR, conn,
3149 "invalid stop flag %d\n", flag);
3150 }
3151}
3152EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3153
3154int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3155 struct iscsi_cls_conn *cls_conn, int is_leading)
3156{
3157 struct iscsi_session *session = cls_session->dd_data;
3158 struct iscsi_conn *conn = cls_conn->dd_data;
3159
3160 spin_lock_bh(&session->frwd_lock);
3161 if (is_leading)
3162 session->leadconn = conn;
3163 spin_unlock_bh(&session->frwd_lock);
3164
3165 /*
3166 * Unblock xmitworker(), Login Phase will pass through.
3167 */
3168 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3169 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3170 return 0;
3171}
3172EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3173
3174int iscsi_switch_str_param(char **param, char *new_val_buf)
3175{
3176 char *new_val;
3177
3178 if (*param) {
3179 if (!strcmp(*param, new_val_buf))
3180 return 0;
3181 }
3182
3183 new_val = kstrdup(new_val_buf, GFP_NOIO);
3184 if (!new_val)
3185 return -ENOMEM;
3186
3187 kfree(*param);
3188 *param = new_val;
3189 return 0;
3190}
3191EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3192
3193int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3194 enum iscsi_param param, char *buf, int buflen)
3195{
3196 struct iscsi_conn *conn = cls_conn->dd_data;
3197 struct iscsi_session *session = conn->session;
3198 int val;
3199
3200 switch(param) {
3201 case ISCSI_PARAM_FAST_ABORT:
3202 sscanf(buf, "%d", &session->fast_abort);
3203 break;
3204 case ISCSI_PARAM_ABORT_TMO:
3205 sscanf(buf, "%d", &session->abort_timeout);
3206 break;
3207 case ISCSI_PARAM_LU_RESET_TMO:
3208 sscanf(buf, "%d", &session->lu_reset_timeout);
3209 break;
3210 case ISCSI_PARAM_TGT_RESET_TMO:
3211 sscanf(buf, "%d", &session->tgt_reset_timeout);
3212 break;
3213 case ISCSI_PARAM_PING_TMO:
3214 sscanf(buf, "%d", &conn->ping_timeout);
3215 break;
3216 case ISCSI_PARAM_RECV_TMO:
3217 sscanf(buf, "%d", &conn->recv_timeout);
3218 break;
3219 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3220 sscanf(buf, "%d", &conn->max_recv_dlength);
3221 break;
3222 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3223 sscanf(buf, "%d", &conn->max_xmit_dlength);
3224 break;
3225 case ISCSI_PARAM_HDRDGST_EN:
3226 sscanf(buf, "%d", &conn->hdrdgst_en);
3227 break;
3228 case ISCSI_PARAM_DATADGST_EN:
3229 sscanf(buf, "%d", &conn->datadgst_en);
3230 break;
3231 case ISCSI_PARAM_INITIAL_R2T_EN:
3232 sscanf(buf, "%d", &session->initial_r2t_en);
3233 break;
3234 case ISCSI_PARAM_MAX_R2T:
3235 sscanf(buf, "%hu", &session->max_r2t);
3236 break;
3237 case ISCSI_PARAM_IMM_DATA_EN:
3238 sscanf(buf, "%d", &session->imm_data_en);
3239 break;
3240 case ISCSI_PARAM_FIRST_BURST:
3241 sscanf(buf, "%d", &session->first_burst);
3242 break;
3243 case ISCSI_PARAM_MAX_BURST:
3244 sscanf(buf, "%d", &session->max_burst);
3245 break;
3246 case ISCSI_PARAM_PDU_INORDER_EN:
3247 sscanf(buf, "%d", &session->pdu_inorder_en);
3248 break;
3249 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3250 sscanf(buf, "%d", &session->dataseq_inorder_en);
3251 break;
3252 case ISCSI_PARAM_ERL:
3253 sscanf(buf, "%d", &session->erl);
3254 break;
3255 case ISCSI_PARAM_EXP_STATSN:
3256 sscanf(buf, "%u", &conn->exp_statsn);
3257 break;
3258 case ISCSI_PARAM_USERNAME:
3259 return iscsi_switch_str_param(&session->username, buf);
3260 case ISCSI_PARAM_USERNAME_IN:
3261 return iscsi_switch_str_param(&session->username_in, buf);
3262 case ISCSI_PARAM_PASSWORD:
3263 return iscsi_switch_str_param(&session->password, buf);
3264 case ISCSI_PARAM_PASSWORD_IN:
3265 return iscsi_switch_str_param(&session->password_in, buf);
3266 case ISCSI_PARAM_TARGET_NAME:
3267 return iscsi_switch_str_param(&session->targetname, buf);
3268 case ISCSI_PARAM_TARGET_ALIAS:
3269 return iscsi_switch_str_param(&session->targetalias, buf);
3270 case ISCSI_PARAM_TPGT:
3271 sscanf(buf, "%d", &session->tpgt);
3272 break;
3273 case ISCSI_PARAM_PERSISTENT_PORT:
3274 sscanf(buf, "%d", &conn->persistent_port);
3275 break;
3276 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3277 return iscsi_switch_str_param(&conn->persistent_address, buf);
3278 case ISCSI_PARAM_IFACE_NAME:
3279 return iscsi_switch_str_param(&session->ifacename, buf);
3280 case ISCSI_PARAM_INITIATOR_NAME:
3281 return iscsi_switch_str_param(&session->initiatorname, buf);
3282 case ISCSI_PARAM_BOOT_ROOT:
3283 return iscsi_switch_str_param(&session->boot_root, buf);
3284 case ISCSI_PARAM_BOOT_NIC:
3285 return iscsi_switch_str_param(&session->boot_nic, buf);
3286 case ISCSI_PARAM_BOOT_TARGET:
3287 return iscsi_switch_str_param(&session->boot_target, buf);
3288 case ISCSI_PARAM_PORTAL_TYPE:
3289 return iscsi_switch_str_param(&session->portal_type, buf);
3290 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3291 return iscsi_switch_str_param(&session->discovery_parent_type,
3292 buf);
3293 case ISCSI_PARAM_DISCOVERY_SESS:
3294 sscanf(buf, "%d", &val);
3295 session->discovery_sess = !!val;
3296 break;
3297 case ISCSI_PARAM_LOCAL_IPADDR:
3298 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3299 default:
3300 return -ENOSYS;
3301 }
3302
3303 return 0;
3304}
3305EXPORT_SYMBOL_GPL(iscsi_set_param);
3306
3307int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3308 enum iscsi_param param, char *buf)
3309{
3310 struct iscsi_session *session = cls_session->dd_data;
3311 int len;
3312
3313 switch(param) {
3314 case ISCSI_PARAM_FAST_ABORT:
3315 len = sprintf(buf, "%d\n", session->fast_abort);
3316 break;
3317 case ISCSI_PARAM_ABORT_TMO:
3318 len = sprintf(buf, "%d\n", session->abort_timeout);
3319 break;
3320 case ISCSI_PARAM_LU_RESET_TMO:
3321 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3322 break;
3323 case ISCSI_PARAM_TGT_RESET_TMO:
3324 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3325 break;
3326 case ISCSI_PARAM_INITIAL_R2T_EN:
3327 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3328 break;
3329 case ISCSI_PARAM_MAX_R2T:
3330 len = sprintf(buf, "%hu\n", session->max_r2t);
3331 break;
3332 case ISCSI_PARAM_IMM_DATA_EN:
3333 len = sprintf(buf, "%d\n", session->imm_data_en);
3334 break;
3335 case ISCSI_PARAM_FIRST_BURST:
3336 len = sprintf(buf, "%u\n", session->first_burst);
3337 break;
3338 case ISCSI_PARAM_MAX_BURST:
3339 len = sprintf(buf, "%u\n", session->max_burst);
3340 break;
3341 case ISCSI_PARAM_PDU_INORDER_EN:
3342 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3343 break;
3344 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3345 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3346 break;
3347 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3348 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3349 break;
3350 case ISCSI_PARAM_ERL:
3351 len = sprintf(buf, "%d\n", session->erl);
3352 break;
3353 case ISCSI_PARAM_TARGET_NAME:
3354 len = sprintf(buf, "%s\n", session->targetname);
3355 break;
3356 case ISCSI_PARAM_TARGET_ALIAS:
3357 len = sprintf(buf, "%s\n", session->targetalias);
3358 break;
3359 case ISCSI_PARAM_TPGT:
3360 len = sprintf(buf, "%d\n", session->tpgt);
3361 break;
3362 case ISCSI_PARAM_USERNAME:
3363 len = sprintf(buf, "%s\n", session->username);
3364 break;
3365 case ISCSI_PARAM_USERNAME_IN:
3366 len = sprintf(buf, "%s\n", session->username_in);
3367 break;
3368 case ISCSI_PARAM_PASSWORD:
3369 len = sprintf(buf, "%s\n", session->password);
3370 break;
3371 case ISCSI_PARAM_PASSWORD_IN:
3372 len = sprintf(buf, "%s\n", session->password_in);
3373 break;
3374 case ISCSI_PARAM_IFACE_NAME:
3375 len = sprintf(buf, "%s\n", session->ifacename);
3376 break;
3377 case ISCSI_PARAM_INITIATOR_NAME:
3378 len = sprintf(buf, "%s\n", session->initiatorname);
3379 break;
3380 case ISCSI_PARAM_BOOT_ROOT:
3381 len = sprintf(buf, "%s\n", session->boot_root);
3382 break;
3383 case ISCSI_PARAM_BOOT_NIC:
3384 len = sprintf(buf, "%s\n", session->boot_nic);
3385 break;
3386 case ISCSI_PARAM_BOOT_TARGET:
3387 len = sprintf(buf, "%s\n", session->boot_target);
3388 break;
3389 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3390 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3391 break;
3392 case ISCSI_PARAM_DISCOVERY_SESS:
3393 len = sprintf(buf, "%u\n", session->discovery_sess);
3394 break;
3395 case ISCSI_PARAM_PORTAL_TYPE:
3396 len = sprintf(buf, "%s\n", session->portal_type);
3397 break;
3398 case ISCSI_PARAM_CHAP_AUTH_EN:
3399 len = sprintf(buf, "%u\n", session->chap_auth_en);
3400 break;
3401 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3402 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3403 break;
3404 case ISCSI_PARAM_BIDI_CHAP_EN:
3405 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3406 break;
3407 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3408 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3409 break;
3410 case ISCSI_PARAM_DEF_TIME2WAIT:
3411 len = sprintf(buf, "%d\n", session->time2wait);
3412 break;
3413 case ISCSI_PARAM_DEF_TIME2RETAIN:
3414 len = sprintf(buf, "%d\n", session->time2retain);
3415 break;
3416 case ISCSI_PARAM_TSID:
3417 len = sprintf(buf, "%u\n", session->tsid);
3418 break;
3419 case ISCSI_PARAM_ISID:
3420 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3421 session->isid[0], session->isid[1],
3422 session->isid[2], session->isid[3],
3423 session->isid[4], session->isid[5]);
3424 break;
3425 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3426 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3427 break;
3428 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3429 if (session->discovery_parent_type)
3430 len = sprintf(buf, "%s\n",
3431 session->discovery_parent_type);
3432 else
3433 len = sprintf(buf, "\n");
3434 break;
3435 default:
3436 return -ENOSYS;
3437 }
3438
3439 return len;
3440}
3441EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3442
3443int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3444 enum iscsi_param param, char *buf)
3445{
3446 struct sockaddr_in6 *sin6 = NULL;
3447 struct sockaddr_in *sin = NULL;
3448 int len;
3449
3450 switch (addr->ss_family) {
3451 case AF_INET:
3452 sin = (struct sockaddr_in *)addr;
3453 break;
3454 case AF_INET6:
3455 sin6 = (struct sockaddr_in6 *)addr;
3456 break;
3457 default:
3458 return -EINVAL;
3459 }
3460
3461 switch (param) {
3462 case ISCSI_PARAM_CONN_ADDRESS:
3463 case ISCSI_HOST_PARAM_IPADDRESS:
3464 if (sin)
3465 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3466 else
3467 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3468 break;
3469 case ISCSI_PARAM_CONN_PORT:
3470 case ISCSI_PARAM_LOCAL_PORT:
3471 if (sin)
3472 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3473 else
3474 len = sprintf(buf, "%hu\n",
3475 be16_to_cpu(sin6->sin6_port));
3476 break;
3477 default:
3478 return -EINVAL;
3479 }
3480
3481 return len;
3482}
3483EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3484
3485int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3486 enum iscsi_param param, char *buf)
3487{
3488 struct iscsi_conn *conn = cls_conn->dd_data;
3489 int len;
3490
3491 switch(param) {
3492 case ISCSI_PARAM_PING_TMO:
3493 len = sprintf(buf, "%u\n", conn->ping_timeout);
3494 break;
3495 case ISCSI_PARAM_RECV_TMO:
3496 len = sprintf(buf, "%u\n", conn->recv_timeout);
3497 break;
3498 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3499 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3500 break;
3501 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3502 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3503 break;
3504 case ISCSI_PARAM_HDRDGST_EN:
3505 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3506 break;
3507 case ISCSI_PARAM_DATADGST_EN:
3508 len = sprintf(buf, "%d\n", conn->datadgst_en);
3509 break;
3510 case ISCSI_PARAM_IFMARKER_EN:
3511 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3512 break;
3513 case ISCSI_PARAM_OFMARKER_EN:
3514 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3515 break;
3516 case ISCSI_PARAM_EXP_STATSN:
3517 len = sprintf(buf, "%u\n", conn->exp_statsn);
3518 break;
3519 case ISCSI_PARAM_PERSISTENT_PORT:
3520 len = sprintf(buf, "%d\n", conn->persistent_port);
3521 break;
3522 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3523 len = sprintf(buf, "%s\n", conn->persistent_address);
3524 break;
3525 case ISCSI_PARAM_STATSN:
3526 len = sprintf(buf, "%u\n", conn->statsn);
3527 break;
3528 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3529 len = sprintf(buf, "%u\n", conn->max_segment_size);
3530 break;
3531 case ISCSI_PARAM_KEEPALIVE_TMO:
3532 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3533 break;
3534 case ISCSI_PARAM_LOCAL_PORT:
3535 len = sprintf(buf, "%u\n", conn->local_port);
3536 break;
3537 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3538 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3539 break;
3540 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3541 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3542 break;
3543 case ISCSI_PARAM_TCP_WSF_DISABLE:
3544 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3545 break;
3546 case ISCSI_PARAM_TCP_TIMER_SCALE:
3547 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3548 break;
3549 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3550 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3551 break;
3552 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3553 len = sprintf(buf, "%u\n", conn->fragment_disable);
3554 break;
3555 case ISCSI_PARAM_IPV4_TOS:
3556 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3557 break;
3558 case ISCSI_PARAM_IPV6_TC:
3559 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3560 break;
3561 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3562 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3563 break;
3564 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3565 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3566 break;
3567 case ISCSI_PARAM_TCP_XMIT_WSF:
3568 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3569 break;
3570 case ISCSI_PARAM_TCP_RECV_WSF:
3571 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3572 break;
3573 case ISCSI_PARAM_LOCAL_IPADDR:
3574 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3575 break;
3576 default:
3577 return -ENOSYS;
3578 }
3579
3580 return len;
3581}
3582EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3583
3584int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3585 char *buf)
3586{
3587 struct iscsi_host *ihost = shost_priv(shost);
3588 int len;
3589
3590 switch (param) {
3591 case ISCSI_HOST_PARAM_NETDEV_NAME:
3592 len = sprintf(buf, "%s\n", ihost->netdev);
3593 break;
3594 case ISCSI_HOST_PARAM_HWADDRESS:
3595 len = sprintf(buf, "%s\n", ihost->hwaddress);
3596 break;
3597 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3598 len = sprintf(buf, "%s\n", ihost->initiatorname);
3599 break;
3600 default:
3601 return -ENOSYS;
3602 }
3603
3604 return len;
3605}
3606EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3607
3608int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3609 char *buf, int buflen)
3610{
3611 struct iscsi_host *ihost = shost_priv(shost);
3612
3613 switch (param) {
3614 case ISCSI_HOST_PARAM_NETDEV_NAME:
3615 return iscsi_switch_str_param(&ihost->netdev, buf);
3616 case ISCSI_HOST_PARAM_HWADDRESS:
3617 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3618 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3619 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3620 default:
3621 return -ENOSYS;
3622 }
3623
3624 return 0;
3625}
3626EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3627
3628MODULE_AUTHOR("Mike Christie");
3629MODULE_DESCRIPTION("iSCSI library functions");
3630MODULE_LICENSE("GPL");