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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/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 unsigned int 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;
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 if (sc->sc_data_direction == DMA_TO_DEVICE) {
395 unsigned out_len = scsi_out(sc)->length;
396 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
397
398 hdr->data_length = cpu_to_be32(out_len);
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 (out_len >= session->first_burst)
418 task->imm_count = min(session->first_burst,
419 conn->max_xmit_dlength);
420 else
421 task->imm_count = min(out_len,
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, out_len) -
429 task->imm_count;
430 r2t->data_offset = task->imm_count;
431 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
432 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
433 }
434
435 if (!task->unsol_r2t.data_length)
436 /* No unsolicit Data-Out's */
437 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
438 } else {
439 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
440 zero_data(hdr->dlength);
441 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
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, scsi_bufflen(sc),
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 task = conn->login_task;
721 } else {
722 if (session->state != ISCSI_STATE_LOGGED_IN)
723 return NULL;
724
725 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
726 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
727
728 if (!kfifo_out(&session->cmdpool.queue,
729 (void*)&task, sizeof(void*)))
730 return NULL;
731 }
732 /*
733 * released in complete pdu for task we expect a response for, and
734 * released by the lld when it has transmitted the task for
735 * pdus we do not expect a response for.
736 */
737 atomic_set(&task->refcount, 1);
738 task->conn = conn;
739 task->sc = NULL;
740 INIT_LIST_HEAD(&task->running);
741 task->state = ISCSI_TASK_PENDING;
742
743 if (data_size) {
744 memcpy(task->data, data, data_size);
745 task->data_count = data_size;
746 } else
747 task->data_count = 0;
748
749 if (conn->session->tt->alloc_pdu) {
750 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
751 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
752 "pdu for mgmt task.\n");
753 goto free_task;
754 }
755 }
756
757 itt = task->hdr->itt;
758 task->hdr_len = sizeof(struct iscsi_hdr);
759 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
760
761 if (hdr->itt != RESERVED_ITT) {
762 if (session->tt->parse_pdu_itt)
763 task->hdr->itt = itt;
764 else
765 task->hdr->itt = build_itt(task->itt,
766 task->conn->session->age);
767 }
768
769 if (!ihost->workq) {
770 if (iscsi_prep_mgmt_task(conn, task))
771 goto free_task;
772
773 if (session->tt->xmit_task(task))
774 goto free_task;
775 } else {
776 list_add_tail(&task->running, &conn->mgmtqueue);
777 iscsi_conn_queue_work(conn);
778 }
779
780 return task;
781
782free_task:
783 /* regular RX path uses back_lock */
784 spin_lock_bh(&session->back_lock);
785 __iscsi_put_task(task);
786 spin_unlock_bh(&session->back_lock);
787 return NULL;
788}
789
790int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
791 char *data, uint32_t data_size)
792{
793 struct iscsi_conn *conn = cls_conn->dd_data;
794 struct iscsi_session *session = conn->session;
795 int err = 0;
796
797 spin_lock_bh(&session->frwd_lock);
798 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
799 err = -EPERM;
800 spin_unlock_bh(&session->frwd_lock);
801 return err;
802}
803EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
804
805/**
806 * iscsi_cmd_rsp - SCSI Command Response processing
807 * @conn: iscsi connection
808 * @hdr: iscsi header
809 * @task: scsi command task
810 * @data: cmd data buffer
811 * @datalen: len of buffer
812 *
813 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
814 * then completes the command and task.
815 **/
816static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
817 struct iscsi_task *task, char *data,
818 int datalen)
819{
820 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
821 struct iscsi_session *session = conn->session;
822 struct scsi_cmnd *sc = task->sc;
823
824 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
825 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
826
827 sc->result = (DID_OK << 16) | rhdr->cmd_status;
828
829 if (task->protected) {
830 sector_t sector;
831 u8 ascq;
832
833 /**
834 * Transports that didn't implement check_protection
835 * callback but still published T10-PI support to scsi-mid
836 * deserve this BUG_ON.
837 **/
838 BUG_ON(!session->tt->check_protection);
839
840 ascq = session->tt->check_protection(task, §or);
841 if (ascq) {
842 sc->result = DRIVER_SENSE << 24 |
843 SAM_STAT_CHECK_CONDITION;
844 scsi_build_sense_buffer(1, sc->sense_buffer,
845 ILLEGAL_REQUEST, 0x10, ascq);
846 sc->sense_buffer[7] = 0xc; /* Additional sense length */
847 sc->sense_buffer[8] = 0; /* Information desc type */
848 sc->sense_buffer[9] = 0xa; /* Additional desc length */
849 sc->sense_buffer[10] = 0x80; /* Validity bit */
850
851 put_unaligned_be64(sector, &sc->sense_buffer[12]);
852 goto out;
853 }
854 }
855
856 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
857 sc->result = DID_ERROR << 16;
858 goto out;
859 }
860
861 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
862 uint16_t senselen;
863
864 if (datalen < 2) {
865invalid_datalen:
866 iscsi_conn_printk(KERN_ERR, conn,
867 "Got CHECK_CONDITION but invalid data "
868 "buffer size of %d\n", datalen);
869 sc->result = DID_BAD_TARGET << 16;
870 goto out;
871 }
872
873 senselen = get_unaligned_be16(data);
874 if (datalen < senselen)
875 goto invalid_datalen;
876
877 memcpy(sc->sense_buffer, data + 2,
878 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
879 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
880 min_t(uint16_t, senselen,
881 SCSI_SENSE_BUFFERSIZE));
882 }
883
884 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
885 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
886 int res_count = be32_to_cpu(rhdr->bi_residual_count);
887
888 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
889 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
890 res_count <= scsi_in(sc)->length))
891 scsi_in(sc)->resid = res_count;
892 else
893 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
894 }
895
896 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
897 ISCSI_FLAG_CMD_OVERFLOW)) {
898 int res_count = be32_to_cpu(rhdr->residual_count);
899
900 if (res_count > 0 &&
901 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
902 res_count <= scsi_bufflen(sc)))
903 /* write side for bidi or uni-io set_resid */
904 scsi_set_resid(sc, res_count);
905 else
906 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
907 }
908out:
909 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
910 sc, sc->result, task->itt);
911 conn->scsirsp_pdus_cnt++;
912 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
913}
914
915/**
916 * iscsi_data_in_rsp - SCSI Data-In Response processing
917 * @conn: iscsi connection
918 * @hdr: iscsi pdu
919 * @task: scsi command task
920 **/
921static void
922iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
923 struct iscsi_task *task)
924{
925 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
926 struct scsi_cmnd *sc = task->sc;
927
928 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
929 return;
930
931 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
932 sc->result = (DID_OK << 16) | rhdr->cmd_status;
933 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
934 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
935 ISCSI_FLAG_DATA_OVERFLOW)) {
936 int res_count = be32_to_cpu(rhdr->residual_count);
937
938 if (res_count > 0 &&
939 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
940 res_count <= scsi_in(sc)->length))
941 scsi_in(sc)->resid = res_count;
942 else
943 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
944 }
945
946 ISCSI_DBG_SESSION(conn->session, "data in with status done "
947 "[sc %p res %d itt 0x%x]\n",
948 sc, sc->result, task->itt);
949 conn->scsirsp_pdus_cnt++;
950 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
951}
952
953static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
954{
955 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
956
957 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
958 conn->tmfrsp_pdus_cnt++;
959
960 if (conn->tmf_state != TMF_QUEUED)
961 return;
962
963 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
964 conn->tmf_state = TMF_SUCCESS;
965 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
966 conn->tmf_state = TMF_NOT_FOUND;
967 else
968 conn->tmf_state = TMF_FAILED;
969 wake_up(&conn->ehwait);
970}
971
972static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
973{
974 struct iscsi_nopout hdr;
975 struct iscsi_task *task;
976
977 if (!rhdr && conn->ping_task)
978 return;
979
980 memset(&hdr, 0, sizeof(struct iscsi_nopout));
981 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
982 hdr.flags = ISCSI_FLAG_CMD_FINAL;
983
984 if (rhdr) {
985 hdr.lun = rhdr->lun;
986 hdr.ttt = rhdr->ttt;
987 hdr.itt = RESERVED_ITT;
988 } else
989 hdr.ttt = RESERVED_ITT;
990
991 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
992 if (!task)
993 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
994 else if (!rhdr) {
995 /* only track our nops */
996 conn->ping_task = task;
997 conn->last_ping = jiffies;
998 }
999}
1000
1001static int iscsi_nop_out_rsp(struct iscsi_task *task,
1002 struct iscsi_nopin *nop, char *data, int datalen)
1003{
1004 struct iscsi_conn *conn = task->conn;
1005 int rc = 0;
1006
1007 if (conn->ping_task != task) {
1008 /*
1009 * If this is not in response to one of our
1010 * nops then it must be from userspace.
1011 */
1012 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1013 data, datalen))
1014 rc = ISCSI_ERR_CONN_FAILED;
1015 } else
1016 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1017 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1018 return rc;
1019}
1020
1021static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1022 char *data, int datalen)
1023{
1024 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1025 struct iscsi_hdr rejected_pdu;
1026 int opcode, rc = 0;
1027
1028 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1029
1030 if (ntoh24(reject->dlength) > datalen ||
1031 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1032 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1033 "pdu. Invalid data length (pdu dlength "
1034 "%u, datalen %d\n", ntoh24(reject->dlength),
1035 datalen);
1036 return ISCSI_ERR_PROTO;
1037 }
1038 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1039 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1040
1041 switch (reject->reason) {
1042 case ISCSI_REASON_DATA_DIGEST_ERROR:
1043 iscsi_conn_printk(KERN_ERR, conn,
1044 "pdu (op 0x%x itt 0x%x) rejected "
1045 "due to DataDigest error.\n",
1046 opcode, rejected_pdu.itt);
1047 break;
1048 case ISCSI_REASON_IMM_CMD_REJECT:
1049 iscsi_conn_printk(KERN_ERR, conn,
1050 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1051 "immediate commands.\n",
1052 opcode, rejected_pdu.itt);
1053 /*
1054 * We only send one TMF at a time so if the target could not
1055 * handle it, then it should get fixed (RFC mandates that
1056 * a target can handle one immediate TMF per conn).
1057 *
1058 * For nops-outs, we could have sent more than one if
1059 * the target is sending us lots of nop-ins
1060 */
1061 if (opcode != ISCSI_OP_NOOP_OUT)
1062 return 0;
1063
1064 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1065 /*
1066 * nop-out in response to target's nop-out rejected.
1067 * Just resend.
1068 */
1069 /* In RX path we are under back lock */
1070 spin_unlock(&conn->session->back_lock);
1071 spin_lock(&conn->session->frwd_lock);
1072 iscsi_send_nopout(conn,
1073 (struct iscsi_nopin*)&rejected_pdu);
1074 spin_unlock(&conn->session->frwd_lock);
1075 spin_lock(&conn->session->back_lock);
1076 } else {
1077 struct iscsi_task *task;
1078 /*
1079 * Our nop as ping got dropped. We know the target
1080 * and transport are ok so just clean up
1081 */
1082 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1083 if (!task) {
1084 iscsi_conn_printk(KERN_ERR, conn,
1085 "Invalid pdu reject. Could "
1086 "not lookup rejected task.\n");
1087 rc = ISCSI_ERR_BAD_ITT;
1088 } else
1089 rc = iscsi_nop_out_rsp(task,
1090 (struct iscsi_nopin*)&rejected_pdu,
1091 NULL, 0);
1092 }
1093 break;
1094 default:
1095 iscsi_conn_printk(KERN_ERR, conn,
1096 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1097 "code 0x%x\n", rejected_pdu.opcode,
1098 rejected_pdu.itt, reject->reason);
1099 break;
1100 }
1101 return rc;
1102}
1103
1104/**
1105 * iscsi_itt_to_task - look up task by itt
1106 * @conn: iscsi connection
1107 * @itt: itt
1108 *
1109 * This should be used for mgmt tasks like login and nops, or if
1110 * the LDD's itt space does not include the session age.
1111 *
1112 * The session back_lock must be held.
1113 */
1114struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1115{
1116 struct iscsi_session *session = conn->session;
1117 int i;
1118
1119 if (itt == RESERVED_ITT)
1120 return NULL;
1121
1122 if (session->tt->parse_pdu_itt)
1123 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1124 else
1125 i = get_itt(itt);
1126 if (i >= session->cmds_max)
1127 return NULL;
1128
1129 return session->cmds[i];
1130}
1131EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1132
1133/**
1134 * __iscsi_complete_pdu - complete pdu
1135 * @conn: iscsi conn
1136 * @hdr: iscsi header
1137 * @data: data buffer
1138 * @datalen: len of data buffer
1139 *
1140 * Completes pdu processing by freeing any resources allocated at
1141 * queuecommand or send generic. session back_lock must be held and verify
1142 * itt must have been called.
1143 */
1144int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1145 char *data, int datalen)
1146{
1147 struct iscsi_session *session = conn->session;
1148 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1149 struct iscsi_task *task;
1150 uint32_t itt;
1151
1152 conn->last_recv = jiffies;
1153 rc = iscsi_verify_itt(conn, hdr->itt);
1154 if (rc)
1155 return rc;
1156
1157 if (hdr->itt != RESERVED_ITT)
1158 itt = get_itt(hdr->itt);
1159 else
1160 itt = ~0U;
1161
1162 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1163 opcode, conn->id, itt, datalen);
1164
1165 if (itt == ~0U) {
1166 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1167
1168 switch(opcode) {
1169 case ISCSI_OP_NOOP_IN:
1170 if (datalen) {
1171 rc = ISCSI_ERR_PROTO;
1172 break;
1173 }
1174
1175 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1176 break;
1177
1178 /* In RX path we are under back lock */
1179 spin_unlock(&session->back_lock);
1180 spin_lock(&session->frwd_lock);
1181 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1182 spin_unlock(&session->frwd_lock);
1183 spin_lock(&session->back_lock);
1184 break;
1185 case ISCSI_OP_REJECT:
1186 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1187 break;
1188 case ISCSI_OP_ASYNC_EVENT:
1189 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1190 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1191 rc = ISCSI_ERR_CONN_FAILED;
1192 break;
1193 default:
1194 rc = ISCSI_ERR_BAD_OPCODE;
1195 break;
1196 }
1197 goto out;
1198 }
1199
1200 switch(opcode) {
1201 case ISCSI_OP_SCSI_CMD_RSP:
1202 case ISCSI_OP_SCSI_DATA_IN:
1203 task = iscsi_itt_to_ctask(conn, hdr->itt);
1204 if (!task)
1205 return ISCSI_ERR_BAD_ITT;
1206 task->last_xfer = jiffies;
1207 break;
1208 case ISCSI_OP_R2T:
1209 /*
1210 * LLD handles R2Ts if they need to.
1211 */
1212 return 0;
1213 case ISCSI_OP_LOGOUT_RSP:
1214 case ISCSI_OP_LOGIN_RSP:
1215 case ISCSI_OP_TEXT_RSP:
1216 case ISCSI_OP_SCSI_TMFUNC_RSP:
1217 case ISCSI_OP_NOOP_IN:
1218 task = iscsi_itt_to_task(conn, hdr->itt);
1219 if (!task)
1220 return ISCSI_ERR_BAD_ITT;
1221 break;
1222 default:
1223 return ISCSI_ERR_BAD_OPCODE;
1224 }
1225
1226 switch(opcode) {
1227 case ISCSI_OP_SCSI_CMD_RSP:
1228 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1229 break;
1230 case ISCSI_OP_SCSI_DATA_IN:
1231 iscsi_data_in_rsp(conn, hdr, task);
1232 break;
1233 case ISCSI_OP_LOGOUT_RSP:
1234 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1235 if (datalen) {
1236 rc = ISCSI_ERR_PROTO;
1237 break;
1238 }
1239 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1240 goto recv_pdu;
1241 case ISCSI_OP_LOGIN_RSP:
1242 case ISCSI_OP_TEXT_RSP:
1243 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1244 /*
1245 * login related PDU's exp_statsn is handled in
1246 * userspace
1247 */
1248 goto recv_pdu;
1249 case ISCSI_OP_SCSI_TMFUNC_RSP:
1250 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1251 if (datalen) {
1252 rc = ISCSI_ERR_PROTO;
1253 break;
1254 }
1255
1256 iscsi_tmf_rsp(conn, hdr);
1257 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1258 break;
1259 case ISCSI_OP_NOOP_IN:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1262 rc = ISCSI_ERR_PROTO;
1263 break;
1264 }
1265 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1266
1267 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1268 data, datalen);
1269 break;
1270 default:
1271 rc = ISCSI_ERR_BAD_OPCODE;
1272 break;
1273 }
1274
1275out:
1276 return rc;
1277recv_pdu:
1278 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1279 rc = ISCSI_ERR_CONN_FAILED;
1280 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1281 return rc;
1282}
1283EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1284
1285int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1286 char *data, int datalen)
1287{
1288 int rc;
1289
1290 spin_lock(&conn->session->back_lock);
1291 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1292 spin_unlock(&conn->session->back_lock);
1293 return rc;
1294}
1295EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1296
1297int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1298{
1299 struct iscsi_session *session = conn->session;
1300 int age = 0, i = 0;
1301
1302 if (itt == RESERVED_ITT)
1303 return 0;
1304
1305 if (session->tt->parse_pdu_itt)
1306 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1307 else {
1308 i = get_itt(itt);
1309 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1310 }
1311
1312 if (age != session->age) {
1313 iscsi_conn_printk(KERN_ERR, conn,
1314 "received itt %x expected session age (%x)\n",
1315 (__force u32)itt, session->age);
1316 return ISCSI_ERR_BAD_ITT;
1317 }
1318
1319 if (i >= session->cmds_max) {
1320 iscsi_conn_printk(KERN_ERR, conn,
1321 "received invalid itt index %u (max cmds "
1322 "%u.\n", i, session->cmds_max);
1323 return ISCSI_ERR_BAD_ITT;
1324 }
1325 return 0;
1326}
1327EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1328
1329/**
1330 * iscsi_itt_to_ctask - look up ctask by itt
1331 * @conn: iscsi connection
1332 * @itt: itt
1333 *
1334 * This should be used for cmd tasks.
1335 *
1336 * The session back_lock must be held.
1337 */
1338struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1339{
1340 struct iscsi_task *task;
1341
1342 if (iscsi_verify_itt(conn, itt))
1343 return NULL;
1344
1345 task = iscsi_itt_to_task(conn, itt);
1346 if (!task || !task->sc)
1347 return NULL;
1348
1349 if (task->sc->SCp.phase != conn->session->age) {
1350 iscsi_session_printk(KERN_ERR, conn->session,
1351 "task's session age %d, expected %d\n",
1352 task->sc->SCp.phase, conn->session->age);
1353 return NULL;
1354 }
1355
1356 return task;
1357}
1358EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1359
1360void iscsi_session_failure(struct iscsi_session *session,
1361 enum iscsi_err err)
1362{
1363 struct iscsi_conn *conn;
1364 struct device *dev;
1365
1366 spin_lock_bh(&session->frwd_lock);
1367 conn = session->leadconn;
1368 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1369 spin_unlock_bh(&session->frwd_lock);
1370 return;
1371 }
1372
1373 dev = get_device(&conn->cls_conn->dev);
1374 spin_unlock_bh(&session->frwd_lock);
1375 if (!dev)
1376 return;
1377 /*
1378 * if the host is being removed bypass the connection
1379 * recovery initialization because we are going to kill
1380 * the session.
1381 */
1382 if (err == ISCSI_ERR_INVALID_HOST)
1383 iscsi_conn_error_event(conn->cls_conn, err);
1384 else
1385 iscsi_conn_failure(conn, err);
1386 put_device(dev);
1387}
1388EXPORT_SYMBOL_GPL(iscsi_session_failure);
1389
1390void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1391{
1392 struct iscsi_session *session = conn->session;
1393
1394 spin_lock_bh(&session->frwd_lock);
1395 if (session->state == ISCSI_STATE_FAILED) {
1396 spin_unlock_bh(&session->frwd_lock);
1397 return;
1398 }
1399
1400 if (conn->stop_stage == 0)
1401 session->state = ISCSI_STATE_FAILED;
1402 spin_unlock_bh(&session->frwd_lock);
1403
1404 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1405 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1406 iscsi_conn_error_event(conn->cls_conn, err);
1407}
1408EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1409
1410static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1411{
1412 struct iscsi_session *session = conn->session;
1413
1414 /*
1415 * Check for iSCSI window and take care of CmdSN wrap-around
1416 */
1417 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1418 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1419 "%u MaxCmdSN %u CmdSN %u/%u\n",
1420 session->exp_cmdsn, session->max_cmdsn,
1421 session->cmdsn, session->queued_cmdsn);
1422 return -ENOSPC;
1423 }
1424 return 0;
1425}
1426
1427static int iscsi_xmit_task(struct iscsi_conn *conn)
1428{
1429 struct iscsi_task *task = conn->task;
1430 int rc;
1431
1432 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1433 return -ENODATA;
1434
1435 __iscsi_get_task(task);
1436 spin_unlock_bh(&conn->session->frwd_lock);
1437 rc = conn->session->tt->xmit_task(task);
1438 spin_lock_bh(&conn->session->frwd_lock);
1439 if (!rc) {
1440 /* done with this task */
1441 task->last_xfer = jiffies;
1442 conn->task = NULL;
1443 }
1444 /* regular RX path uses back_lock */
1445 spin_lock_bh(&conn->session->back_lock);
1446 __iscsi_put_task(task);
1447 spin_unlock_bh(&conn->session->back_lock);
1448 return rc;
1449}
1450
1451/**
1452 * iscsi_requeue_task - requeue task to run from session workqueue
1453 * @task: task to requeue
1454 *
1455 * LLDs that need to run a task from the session workqueue should call
1456 * this. The session frwd_lock must be held. This should only be called
1457 * by software drivers.
1458 */
1459void iscsi_requeue_task(struct iscsi_task *task)
1460{
1461 struct iscsi_conn *conn = task->conn;
1462
1463 /*
1464 * this may be on the requeue list already if the xmit_task callout
1465 * is handling the r2ts while we are adding new ones
1466 */
1467 if (list_empty(&task->running))
1468 list_add_tail(&task->running, &conn->requeue);
1469 iscsi_conn_queue_work(conn);
1470}
1471EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1472
1473/**
1474 * iscsi_data_xmit - xmit any command into the scheduled connection
1475 * @conn: iscsi connection
1476 *
1477 * Notes:
1478 * The function can return -EAGAIN in which case the caller must
1479 * re-schedule it again later or recover. '0' return code means
1480 * successful xmit.
1481 **/
1482static int iscsi_data_xmit(struct iscsi_conn *conn)
1483{
1484 struct iscsi_task *task;
1485 int rc = 0;
1486
1487 spin_lock_bh(&conn->session->frwd_lock);
1488 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1489 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1490 spin_unlock_bh(&conn->session->frwd_lock);
1491 return -ENODATA;
1492 }
1493
1494 if (conn->task) {
1495 rc = iscsi_xmit_task(conn);
1496 if (rc)
1497 goto done;
1498 }
1499
1500 /*
1501 * process mgmt pdus like nops before commands since we should
1502 * only have one nop-out as a ping from us and targets should not
1503 * overflow us with nop-ins
1504 */
1505check_mgmt:
1506 while (!list_empty(&conn->mgmtqueue)) {
1507 conn->task = list_entry(conn->mgmtqueue.next,
1508 struct iscsi_task, running);
1509 list_del_init(&conn->task->running);
1510 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1511 /* regular RX path uses back_lock */
1512 spin_lock_bh(&conn->session->back_lock);
1513 __iscsi_put_task(conn->task);
1514 spin_unlock_bh(&conn->session->back_lock);
1515 conn->task = NULL;
1516 continue;
1517 }
1518 rc = iscsi_xmit_task(conn);
1519 if (rc)
1520 goto done;
1521 }
1522
1523 /* process pending command queue */
1524 while (!list_empty(&conn->cmdqueue)) {
1525 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1526 running);
1527 list_del_init(&conn->task->running);
1528 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1529 fail_scsi_task(conn->task, DID_IMM_RETRY);
1530 continue;
1531 }
1532 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1533 if (rc) {
1534 if (rc == -ENOMEM || rc == -EACCES) {
1535 list_add_tail(&conn->task->running,
1536 &conn->cmdqueue);
1537 conn->task = NULL;
1538 goto done;
1539 } else
1540 fail_scsi_task(conn->task, DID_ABORT);
1541 continue;
1542 }
1543 rc = iscsi_xmit_task(conn);
1544 if (rc)
1545 goto done;
1546 /*
1547 * we could continuously get new task requests so
1548 * we need to check the mgmt queue for nops that need to
1549 * be sent to aviod starvation
1550 */
1551 if (!list_empty(&conn->mgmtqueue))
1552 goto check_mgmt;
1553 }
1554
1555 while (!list_empty(&conn->requeue)) {
1556 /*
1557 * we always do fastlogout - conn stop code will clean up.
1558 */
1559 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1560 break;
1561
1562 task = list_entry(conn->requeue.next, struct iscsi_task,
1563 running);
1564 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1565 break;
1566
1567 conn->task = task;
1568 list_del_init(&conn->task->running);
1569 conn->task->state = ISCSI_TASK_RUNNING;
1570 rc = iscsi_xmit_task(conn);
1571 if (rc)
1572 goto done;
1573 if (!list_empty(&conn->mgmtqueue))
1574 goto check_mgmt;
1575 }
1576 spin_unlock_bh(&conn->session->frwd_lock);
1577 return -ENODATA;
1578
1579done:
1580 spin_unlock_bh(&conn->session->frwd_lock);
1581 return rc;
1582}
1583
1584static void iscsi_xmitworker(struct work_struct *work)
1585{
1586 struct iscsi_conn *conn =
1587 container_of(work, struct iscsi_conn, xmitwork);
1588 int rc;
1589 /*
1590 * serialize Xmit worker on a per-connection basis.
1591 */
1592 do {
1593 rc = iscsi_data_xmit(conn);
1594 } while (rc >= 0 || rc == -EAGAIN);
1595}
1596
1597static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1598 struct scsi_cmnd *sc)
1599{
1600 struct iscsi_task *task;
1601
1602 if (!kfifo_out(&conn->session->cmdpool.queue,
1603 (void *) &task, sizeof(void *)))
1604 return NULL;
1605
1606 sc->SCp.phase = conn->session->age;
1607 sc->SCp.ptr = (char *) task;
1608
1609 atomic_set(&task->refcount, 1);
1610 task->state = ISCSI_TASK_PENDING;
1611 task->conn = conn;
1612 task->sc = sc;
1613 task->have_checked_conn = false;
1614 task->last_timeout = jiffies;
1615 task->last_xfer = jiffies;
1616 task->protected = false;
1617 INIT_LIST_HEAD(&task->running);
1618 return task;
1619}
1620
1621enum {
1622 FAILURE_BAD_HOST = 1,
1623 FAILURE_SESSION_FAILED,
1624 FAILURE_SESSION_FREED,
1625 FAILURE_WINDOW_CLOSED,
1626 FAILURE_OOM,
1627 FAILURE_SESSION_TERMINATE,
1628 FAILURE_SESSION_IN_RECOVERY,
1629 FAILURE_SESSION_RECOVERY_TIMEOUT,
1630 FAILURE_SESSION_LOGGING_OUT,
1631 FAILURE_SESSION_NOT_READY,
1632};
1633
1634int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1635{
1636 struct iscsi_cls_session *cls_session;
1637 struct iscsi_host *ihost;
1638 int reason = 0;
1639 struct iscsi_session *session;
1640 struct iscsi_conn *conn;
1641 struct iscsi_task *task = NULL;
1642
1643 sc->result = 0;
1644 sc->SCp.ptr = NULL;
1645
1646 ihost = shost_priv(host);
1647
1648 cls_session = starget_to_session(scsi_target(sc->device));
1649 session = cls_session->dd_data;
1650 spin_lock_bh(&session->frwd_lock);
1651
1652 reason = iscsi_session_chkready(cls_session);
1653 if (reason) {
1654 sc->result = reason;
1655 goto fault;
1656 }
1657
1658 if (session->state != ISCSI_STATE_LOGGED_IN) {
1659 /*
1660 * to handle the race between when we set the recovery state
1661 * and block the session we requeue here (commands could
1662 * be entering our queuecommand while a block is starting
1663 * up because the block code is not locked)
1664 */
1665 switch (session->state) {
1666 case ISCSI_STATE_FAILED:
1667 case ISCSI_STATE_IN_RECOVERY:
1668 reason = FAILURE_SESSION_IN_RECOVERY;
1669 sc->result = DID_IMM_RETRY << 16;
1670 break;
1671 case ISCSI_STATE_LOGGING_OUT:
1672 reason = FAILURE_SESSION_LOGGING_OUT;
1673 sc->result = DID_IMM_RETRY << 16;
1674 break;
1675 case ISCSI_STATE_RECOVERY_FAILED:
1676 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1677 sc->result = DID_TRANSPORT_FAILFAST << 16;
1678 break;
1679 case ISCSI_STATE_TERMINATE:
1680 reason = FAILURE_SESSION_TERMINATE;
1681 sc->result = DID_NO_CONNECT << 16;
1682 break;
1683 default:
1684 reason = FAILURE_SESSION_FREED;
1685 sc->result = DID_NO_CONNECT << 16;
1686 }
1687 goto fault;
1688 }
1689
1690 conn = session->leadconn;
1691 if (!conn) {
1692 reason = FAILURE_SESSION_FREED;
1693 sc->result = DID_NO_CONNECT << 16;
1694 goto fault;
1695 }
1696
1697 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1698 reason = FAILURE_SESSION_IN_RECOVERY;
1699 sc->result = DID_REQUEUE;
1700 goto fault;
1701 }
1702
1703 if (iscsi_check_cmdsn_window_closed(conn)) {
1704 reason = FAILURE_WINDOW_CLOSED;
1705 goto reject;
1706 }
1707
1708 task = iscsi_alloc_task(conn, sc);
1709 if (!task) {
1710 reason = FAILURE_OOM;
1711 goto reject;
1712 }
1713
1714 if (!ihost->workq) {
1715 reason = iscsi_prep_scsi_cmd_pdu(task);
1716 if (reason) {
1717 if (reason == -ENOMEM || reason == -EACCES) {
1718 reason = FAILURE_OOM;
1719 goto prepd_reject;
1720 } else {
1721 sc->result = DID_ABORT << 16;
1722 goto prepd_fault;
1723 }
1724 }
1725 if (session->tt->xmit_task(task)) {
1726 session->cmdsn--;
1727 reason = FAILURE_SESSION_NOT_READY;
1728 goto prepd_reject;
1729 }
1730 } else {
1731 list_add_tail(&task->running, &conn->cmdqueue);
1732 iscsi_conn_queue_work(conn);
1733 }
1734
1735 session->queued_cmdsn++;
1736 spin_unlock_bh(&session->frwd_lock);
1737 return 0;
1738
1739prepd_reject:
1740 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1741reject:
1742 spin_unlock_bh(&session->frwd_lock);
1743 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1744 sc->cmnd[0], reason);
1745 return SCSI_MLQUEUE_TARGET_BUSY;
1746
1747prepd_fault:
1748 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1749fault:
1750 spin_unlock_bh(&session->frwd_lock);
1751 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1752 sc->cmnd[0], reason);
1753 if (!scsi_bidi_cmnd(sc))
1754 scsi_set_resid(sc, scsi_bufflen(sc));
1755 else {
1756 scsi_out(sc)->resid = scsi_out(sc)->length;
1757 scsi_in(sc)->resid = scsi_in(sc)->length;
1758 }
1759 sc->scsi_done(sc);
1760 return 0;
1761}
1762EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1763
1764int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
1765{
1766 switch (reason) {
1767 case SCSI_QDEPTH_DEFAULT:
1768 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1769 break;
1770 case SCSI_QDEPTH_QFULL:
1771 scsi_track_queue_full(sdev, depth);
1772 break;
1773 case SCSI_QDEPTH_RAMP_UP:
1774 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1775 break;
1776 default:
1777 return -EOPNOTSUPP;
1778 }
1779 return sdev->queue_depth;
1780}
1781EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1782
1783int iscsi_target_alloc(struct scsi_target *starget)
1784{
1785 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1786 struct iscsi_session *session = cls_session->dd_data;
1787
1788 starget->can_queue = session->scsi_cmds_max;
1789 return 0;
1790}
1791EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1792
1793static void iscsi_tmf_timedout(unsigned long data)
1794{
1795 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1796 struct iscsi_session *session = conn->session;
1797
1798 spin_lock(&session->frwd_lock);
1799 if (conn->tmf_state == TMF_QUEUED) {
1800 conn->tmf_state = TMF_TIMEDOUT;
1801 ISCSI_DBG_EH(session, "tmf timedout\n");
1802 /* unblock eh_abort() */
1803 wake_up(&conn->ehwait);
1804 }
1805 spin_unlock(&session->frwd_lock);
1806}
1807
1808static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1809 struct iscsi_tm *hdr, int age,
1810 int timeout)
1811{
1812 struct iscsi_session *session = conn->session;
1813 struct iscsi_task *task;
1814
1815 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1816 NULL, 0);
1817 if (!task) {
1818 spin_unlock_bh(&session->frwd_lock);
1819 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1820 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1821 spin_lock_bh(&session->frwd_lock);
1822 return -EPERM;
1823 }
1824 conn->tmfcmd_pdus_cnt++;
1825 conn->tmf_timer.expires = timeout * HZ + jiffies;
1826 conn->tmf_timer.function = iscsi_tmf_timedout;
1827 conn->tmf_timer.data = (unsigned long)conn;
1828 add_timer(&conn->tmf_timer);
1829 ISCSI_DBG_EH(session, "tmf set timeout\n");
1830
1831 spin_unlock_bh(&session->frwd_lock);
1832 mutex_unlock(&session->eh_mutex);
1833
1834 /*
1835 * block eh thread until:
1836 *
1837 * 1) tmf response
1838 * 2) tmf timeout
1839 * 3) session is terminated or restarted or userspace has
1840 * given up on recovery
1841 */
1842 wait_event_interruptible(conn->ehwait, age != session->age ||
1843 session->state != ISCSI_STATE_LOGGED_IN ||
1844 conn->tmf_state != TMF_QUEUED);
1845 if (signal_pending(current))
1846 flush_signals(current);
1847 del_timer_sync(&conn->tmf_timer);
1848
1849 mutex_lock(&session->eh_mutex);
1850 spin_lock_bh(&session->frwd_lock);
1851 /* if the session drops it will clean up the task */
1852 if (age != session->age ||
1853 session->state != ISCSI_STATE_LOGGED_IN)
1854 return -ENOTCONN;
1855 return 0;
1856}
1857
1858/*
1859 * Fail commands. session lock held and recv side suspended and xmit
1860 * thread flushed
1861 */
1862static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1863 int error)
1864{
1865 struct iscsi_task *task;
1866 int i;
1867
1868 for (i = 0; i < conn->session->cmds_max; i++) {
1869 task = conn->session->cmds[i];
1870 if (!task->sc || task->state == ISCSI_TASK_FREE)
1871 continue;
1872
1873 if (lun != -1 && lun != task->sc->device->lun)
1874 continue;
1875
1876 ISCSI_DBG_SESSION(conn->session,
1877 "failing sc %p itt 0x%x state %d\n",
1878 task->sc, task->itt, task->state);
1879 fail_scsi_task(task, error);
1880 }
1881}
1882
1883/**
1884 * iscsi_suspend_queue - suspend iscsi_queuecommand
1885 * @conn: iscsi conn to stop queueing IO on
1886 *
1887 * This grabs the session frwd_lock to make sure no one is in
1888 * xmit_task/queuecommand, and then sets suspend to prevent
1889 * new commands from being queued. This only needs to be called
1890 * by offload drivers that need to sync a path like ep disconnect
1891 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1892 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1893 */
1894void iscsi_suspend_queue(struct iscsi_conn *conn)
1895{
1896 spin_lock_bh(&conn->session->frwd_lock);
1897 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1898 spin_unlock_bh(&conn->session->frwd_lock);
1899}
1900EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1901
1902/**
1903 * iscsi_suspend_tx - suspend iscsi_data_xmit
1904 * @conn: iscsi conn tp stop processing IO on.
1905 *
1906 * This function sets the suspend bit to prevent iscsi_data_xmit
1907 * from sending new IO, and if work is queued on the xmit thread
1908 * it will wait for it to be completed.
1909 */
1910void iscsi_suspend_tx(struct iscsi_conn *conn)
1911{
1912 struct Scsi_Host *shost = conn->session->host;
1913 struct iscsi_host *ihost = shost_priv(shost);
1914
1915 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1916 if (ihost->workq)
1917 flush_workqueue(ihost->workq);
1918}
1919EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1920
1921static void iscsi_start_tx(struct iscsi_conn *conn)
1922{
1923 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1924 iscsi_conn_queue_work(conn);
1925}
1926
1927/*
1928 * We want to make sure a ping is in flight. It has timed out.
1929 * And we are not busy processing a pdu that is making
1930 * progress but got started before the ping and is taking a while
1931 * to complete so the ping is just stuck behind it in a queue.
1932 */
1933static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1934{
1935 if (conn->ping_task &&
1936 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1937 (conn->ping_timeout * HZ), jiffies))
1938 return 1;
1939 else
1940 return 0;
1941}
1942
1943static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1944{
1945 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1946 struct iscsi_task *task = NULL, *running_task;
1947 struct iscsi_cls_session *cls_session;
1948 struct iscsi_session *session;
1949 struct iscsi_conn *conn;
1950 int i;
1951
1952 cls_session = starget_to_session(scsi_target(sc->device));
1953 session = cls_session->dd_data;
1954
1955 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1956
1957 spin_lock(&session->frwd_lock);
1958 task = (struct iscsi_task *)sc->SCp.ptr;
1959 if (!task) {
1960 /*
1961 * Raced with completion. Blk layer has taken ownership
1962 * so let timeout code complete it now.
1963 */
1964 rc = BLK_EH_HANDLED;
1965 goto done;
1966 }
1967
1968 if (session->state != ISCSI_STATE_LOGGED_IN) {
1969 /*
1970 * We are probably in the middle of iscsi recovery so let
1971 * that complete and handle the error.
1972 */
1973 rc = BLK_EH_RESET_TIMER;
1974 goto done;
1975 }
1976
1977 conn = session->leadconn;
1978 if (!conn) {
1979 /* In the middle of shuting down */
1980 rc = BLK_EH_RESET_TIMER;
1981 goto done;
1982 }
1983
1984 /*
1985 * If we have sent (at least queued to the network layer) a pdu or
1986 * recvd one for the task since the last timeout ask for
1987 * more time. If on the next timeout we have not made progress
1988 * we can check if it is the task or connection when we send the
1989 * nop as a ping.
1990 */
1991 if (time_after(task->last_xfer, task->last_timeout)) {
1992 ISCSI_DBG_EH(session, "Command making progress. Asking "
1993 "scsi-ml for more time to complete. "
1994 "Last data xfer at %lu. Last timeout was at "
1995 "%lu\n.", task->last_xfer, task->last_timeout);
1996 task->have_checked_conn = false;
1997 rc = BLK_EH_RESET_TIMER;
1998 goto done;
1999 }
2000
2001 if (!conn->recv_timeout && !conn->ping_timeout)
2002 goto done;
2003 /*
2004 * if the ping timedout then we are in the middle of cleaning up
2005 * and can let the iscsi eh handle it
2006 */
2007 if (iscsi_has_ping_timed_out(conn)) {
2008 rc = BLK_EH_RESET_TIMER;
2009 goto done;
2010 }
2011
2012 for (i = 0; i < conn->session->cmds_max; i++) {
2013 running_task = conn->session->cmds[i];
2014 if (!running_task->sc || running_task == task ||
2015 running_task->state != ISCSI_TASK_RUNNING)
2016 continue;
2017
2018 /*
2019 * Only check if cmds started before this one have made
2020 * progress, or this could never fail
2021 */
2022 if (time_after(running_task->sc->jiffies_at_alloc,
2023 task->sc->jiffies_at_alloc))
2024 continue;
2025
2026 if (time_after(running_task->last_xfer, task->last_timeout)) {
2027 /*
2028 * This task has not made progress, but a task
2029 * started before us has transferred data since
2030 * we started/last-checked. We could be queueing
2031 * too many tasks or the LU is bad.
2032 *
2033 * If the device is bad the cmds ahead of us on
2034 * other devs will complete, and this loop will
2035 * eventually fail starting the scsi eh.
2036 */
2037 ISCSI_DBG_EH(session, "Command has not made progress "
2038 "but commands ahead of it have. "
2039 "Asking scsi-ml for more time to "
2040 "complete. Our last xfer vs running task "
2041 "last xfer %lu/%lu. Last check %lu.\n",
2042 task->last_xfer, running_task->last_xfer,
2043 task->last_timeout);
2044 rc = BLK_EH_RESET_TIMER;
2045 goto done;
2046 }
2047 }
2048
2049 /* Assumes nop timeout is shorter than scsi cmd timeout */
2050 if (task->have_checked_conn)
2051 goto done;
2052
2053 /*
2054 * Checking the transport already or nop from a cmd timeout still
2055 * running
2056 */
2057 if (conn->ping_task) {
2058 task->have_checked_conn = true;
2059 rc = BLK_EH_RESET_TIMER;
2060 goto done;
2061 }
2062
2063 /* Make sure there is a transport check done */
2064 iscsi_send_nopout(conn, NULL);
2065 task->have_checked_conn = true;
2066 rc = BLK_EH_RESET_TIMER;
2067
2068done:
2069 if (task)
2070 task->last_timeout = jiffies;
2071 spin_unlock(&session->frwd_lock);
2072 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2073 "timer reset" : "nh");
2074 return rc;
2075}
2076
2077static void iscsi_check_transport_timeouts(unsigned long data)
2078{
2079 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2080 struct iscsi_session *session = conn->session;
2081 unsigned long recv_timeout, next_timeout = 0, last_recv;
2082
2083 spin_lock(&session->frwd_lock);
2084 if (session->state != ISCSI_STATE_LOGGED_IN)
2085 goto done;
2086
2087 recv_timeout = conn->recv_timeout;
2088 if (!recv_timeout)
2089 goto done;
2090
2091 recv_timeout *= HZ;
2092 last_recv = conn->last_recv;
2093
2094 if (iscsi_has_ping_timed_out(conn)) {
2095 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2096 "expired, recv timeout %d, last rx %lu, "
2097 "last ping %lu, now %lu\n",
2098 conn->ping_timeout, conn->recv_timeout,
2099 last_recv, conn->last_ping, jiffies);
2100 spin_unlock(&session->frwd_lock);
2101 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2102 return;
2103 }
2104
2105 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2106 /* send a ping to try to provoke some traffic */
2107 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2108 iscsi_send_nopout(conn, NULL);
2109 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2110 } else
2111 next_timeout = last_recv + recv_timeout;
2112
2113 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2114 mod_timer(&conn->transport_timer, next_timeout);
2115done:
2116 spin_unlock(&session->frwd_lock);
2117}
2118
2119static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2120 struct iscsi_tm *hdr)
2121{
2122 memset(hdr, 0, sizeof(*hdr));
2123 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2124 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2125 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2126 hdr->lun = task->lun;
2127 hdr->rtt = task->hdr_itt;
2128 hdr->refcmdsn = task->cmdsn;
2129}
2130
2131int iscsi_eh_abort(struct scsi_cmnd *sc)
2132{
2133 struct iscsi_cls_session *cls_session;
2134 struct iscsi_session *session;
2135 struct iscsi_conn *conn;
2136 struct iscsi_task *task;
2137 struct iscsi_tm *hdr;
2138 int rc, age;
2139
2140 cls_session = starget_to_session(scsi_target(sc->device));
2141 session = cls_session->dd_data;
2142
2143 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2144
2145 mutex_lock(&session->eh_mutex);
2146 spin_lock_bh(&session->frwd_lock);
2147 /*
2148 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2149 * got the command.
2150 */
2151 if (!sc->SCp.ptr) {
2152 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2153 "it completed.\n");
2154 spin_unlock_bh(&session->frwd_lock);
2155 mutex_unlock(&session->eh_mutex);
2156 return SUCCESS;
2157 }
2158
2159 /*
2160 * If we are not logged in or we have started a new session
2161 * then let the host reset code handle this
2162 */
2163 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2164 sc->SCp.phase != session->age) {
2165 spin_unlock_bh(&session->frwd_lock);
2166 mutex_unlock(&session->eh_mutex);
2167 ISCSI_DBG_EH(session, "failing abort due to dropped "
2168 "session.\n");
2169 return FAILED;
2170 }
2171
2172 conn = session->leadconn;
2173 conn->eh_abort_cnt++;
2174 age = session->age;
2175
2176 task = (struct iscsi_task *)sc->SCp.ptr;
2177 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2178 sc, task->itt);
2179
2180 /* task completed before time out */
2181 if (!task->sc) {
2182 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2183 goto success;
2184 }
2185
2186 if (task->state == ISCSI_TASK_PENDING) {
2187 fail_scsi_task(task, DID_ABORT);
2188 goto success;
2189 }
2190
2191 /* only have one tmf outstanding at a time */
2192 if (conn->tmf_state != TMF_INITIAL)
2193 goto failed;
2194 conn->tmf_state = TMF_QUEUED;
2195
2196 hdr = &conn->tmhdr;
2197 iscsi_prep_abort_task_pdu(task, hdr);
2198
2199 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2200 rc = FAILED;
2201 goto failed;
2202 }
2203
2204 switch (conn->tmf_state) {
2205 case TMF_SUCCESS:
2206 spin_unlock_bh(&session->frwd_lock);
2207 /*
2208 * stop tx side incase the target had sent a abort rsp but
2209 * the initiator was still writing out data.
2210 */
2211 iscsi_suspend_tx(conn);
2212 /*
2213 * we do not stop the recv side because targets have been
2214 * good and have never sent us a successful tmf response
2215 * then sent more data for the cmd.
2216 */
2217 spin_lock_bh(&session->frwd_lock);
2218 fail_scsi_task(task, DID_ABORT);
2219 conn->tmf_state = TMF_INITIAL;
2220 memset(hdr, 0, sizeof(*hdr));
2221 spin_unlock_bh(&session->frwd_lock);
2222 iscsi_start_tx(conn);
2223 goto success_unlocked;
2224 case TMF_TIMEDOUT:
2225 spin_unlock_bh(&session->frwd_lock);
2226 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2227 goto failed_unlocked;
2228 case TMF_NOT_FOUND:
2229 if (!sc->SCp.ptr) {
2230 conn->tmf_state = TMF_INITIAL;
2231 memset(hdr, 0, sizeof(*hdr));
2232 /* task completed before tmf abort response */
2233 ISCSI_DBG_EH(session, "sc completed while abort in "
2234 "progress\n");
2235 goto success;
2236 }
2237 /* fall through */
2238 default:
2239 conn->tmf_state = TMF_INITIAL;
2240 goto failed;
2241 }
2242
2243success:
2244 spin_unlock_bh(&session->frwd_lock);
2245success_unlocked:
2246 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2247 sc, task->itt);
2248 mutex_unlock(&session->eh_mutex);
2249 return SUCCESS;
2250
2251failed:
2252 spin_unlock_bh(&session->frwd_lock);
2253failed_unlocked:
2254 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2255 task ? task->itt : 0);
2256 mutex_unlock(&session->eh_mutex);
2257 return FAILED;
2258}
2259EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2260
2261static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2262{
2263 memset(hdr, 0, sizeof(*hdr));
2264 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2265 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2266 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2267 int_to_scsilun(sc->device->lun, &hdr->lun);
2268 hdr->rtt = RESERVED_ITT;
2269}
2270
2271int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2272{
2273 struct iscsi_cls_session *cls_session;
2274 struct iscsi_session *session;
2275 struct iscsi_conn *conn;
2276 struct iscsi_tm *hdr;
2277 int rc = FAILED;
2278
2279 cls_session = starget_to_session(scsi_target(sc->device));
2280 session = cls_session->dd_data;
2281
2282 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
2283
2284 mutex_lock(&session->eh_mutex);
2285 spin_lock_bh(&session->frwd_lock);
2286 /*
2287 * Just check if we are not logged in. We cannot check for
2288 * the phase because the reset could come from a ioctl.
2289 */
2290 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2291 goto unlock;
2292 conn = session->leadconn;
2293
2294 /* only have one tmf outstanding at a time */
2295 if (conn->tmf_state != TMF_INITIAL)
2296 goto unlock;
2297 conn->tmf_state = TMF_QUEUED;
2298
2299 hdr = &conn->tmhdr;
2300 iscsi_prep_lun_reset_pdu(sc, hdr);
2301
2302 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2303 session->lu_reset_timeout)) {
2304 rc = FAILED;
2305 goto unlock;
2306 }
2307
2308 switch (conn->tmf_state) {
2309 case TMF_SUCCESS:
2310 break;
2311 case TMF_TIMEDOUT:
2312 spin_unlock_bh(&session->frwd_lock);
2313 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2314 goto done;
2315 default:
2316 conn->tmf_state = TMF_INITIAL;
2317 goto unlock;
2318 }
2319
2320 rc = SUCCESS;
2321 spin_unlock_bh(&session->frwd_lock);
2322
2323 iscsi_suspend_tx(conn);
2324
2325 spin_lock_bh(&session->frwd_lock);
2326 memset(hdr, 0, sizeof(*hdr));
2327 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2328 conn->tmf_state = TMF_INITIAL;
2329 spin_unlock_bh(&session->frwd_lock);
2330
2331 iscsi_start_tx(conn);
2332 goto done;
2333
2334unlock:
2335 spin_unlock_bh(&session->frwd_lock);
2336done:
2337 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2338 rc == SUCCESS ? "SUCCESS" : "FAILED");
2339 mutex_unlock(&session->eh_mutex);
2340 return rc;
2341}
2342EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2343
2344void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2345{
2346 struct iscsi_session *session = cls_session->dd_data;
2347
2348 spin_lock_bh(&session->frwd_lock);
2349 if (session->state != ISCSI_STATE_LOGGED_IN) {
2350 session->state = ISCSI_STATE_RECOVERY_FAILED;
2351 if (session->leadconn)
2352 wake_up(&session->leadconn->ehwait);
2353 }
2354 spin_unlock_bh(&session->frwd_lock);
2355}
2356EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2357
2358/**
2359 * iscsi_eh_session_reset - drop session and attempt relogin
2360 * @sc: scsi command
2361 *
2362 * This function will wait for a relogin, session termination from
2363 * userspace, or a recovery/replacement timeout.
2364 */
2365int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2366{
2367 struct iscsi_cls_session *cls_session;
2368 struct iscsi_session *session;
2369 struct iscsi_conn *conn;
2370
2371 cls_session = starget_to_session(scsi_target(sc->device));
2372 session = cls_session->dd_data;
2373 conn = session->leadconn;
2374
2375 mutex_lock(&session->eh_mutex);
2376 spin_lock_bh(&session->frwd_lock);
2377 if (session->state == ISCSI_STATE_TERMINATE) {
2378failed:
2379 ISCSI_DBG_EH(session,
2380 "failing session reset: Could not log back into "
2381 "%s, %s [age %d]\n", session->targetname,
2382 conn->persistent_address, session->age);
2383 spin_unlock_bh(&session->frwd_lock);
2384 mutex_unlock(&session->eh_mutex);
2385 return FAILED;
2386 }
2387
2388 spin_unlock_bh(&session->frwd_lock);
2389 mutex_unlock(&session->eh_mutex);
2390 /*
2391 * we drop the lock here but the leadconn cannot be destoyed while
2392 * we are in the scsi eh
2393 */
2394 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2395
2396 ISCSI_DBG_EH(session, "wait for relogin\n");
2397 wait_event_interruptible(conn->ehwait,
2398 session->state == ISCSI_STATE_TERMINATE ||
2399 session->state == ISCSI_STATE_LOGGED_IN ||
2400 session->state == ISCSI_STATE_RECOVERY_FAILED);
2401 if (signal_pending(current))
2402 flush_signals(current);
2403
2404 mutex_lock(&session->eh_mutex);
2405 spin_lock_bh(&session->frwd_lock);
2406 if (session->state == ISCSI_STATE_LOGGED_IN) {
2407 ISCSI_DBG_EH(session,
2408 "session reset succeeded for %s,%s\n",
2409 session->targetname, conn->persistent_address);
2410 } else
2411 goto failed;
2412 spin_unlock_bh(&session->frwd_lock);
2413 mutex_unlock(&session->eh_mutex);
2414 return SUCCESS;
2415}
2416EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2417
2418static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2419{
2420 memset(hdr, 0, sizeof(*hdr));
2421 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2422 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2423 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2424 hdr->rtt = RESERVED_ITT;
2425}
2426
2427/**
2428 * iscsi_eh_target_reset - reset target
2429 * @sc: scsi command
2430 *
2431 * This will attempt to send a warm target reset.
2432 */
2433int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2434{
2435 struct iscsi_cls_session *cls_session;
2436 struct iscsi_session *session;
2437 struct iscsi_conn *conn;
2438 struct iscsi_tm *hdr;
2439 int rc = FAILED;
2440
2441 cls_session = starget_to_session(scsi_target(sc->device));
2442 session = cls_session->dd_data;
2443
2444 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2445 session->targetname);
2446
2447 mutex_lock(&session->eh_mutex);
2448 spin_lock_bh(&session->frwd_lock);
2449 /*
2450 * Just check if we are not logged in. We cannot check for
2451 * the phase because the reset could come from a ioctl.
2452 */
2453 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2454 goto unlock;
2455 conn = session->leadconn;
2456
2457 /* only have one tmf outstanding at a time */
2458 if (conn->tmf_state != TMF_INITIAL)
2459 goto unlock;
2460 conn->tmf_state = TMF_QUEUED;
2461
2462 hdr = &conn->tmhdr;
2463 iscsi_prep_tgt_reset_pdu(sc, hdr);
2464
2465 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2466 session->tgt_reset_timeout)) {
2467 rc = FAILED;
2468 goto unlock;
2469 }
2470
2471 switch (conn->tmf_state) {
2472 case TMF_SUCCESS:
2473 break;
2474 case TMF_TIMEDOUT:
2475 spin_unlock_bh(&session->frwd_lock);
2476 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2477 goto done;
2478 default:
2479 conn->tmf_state = TMF_INITIAL;
2480 goto unlock;
2481 }
2482
2483 rc = SUCCESS;
2484 spin_unlock_bh(&session->frwd_lock);
2485
2486 iscsi_suspend_tx(conn);
2487
2488 spin_lock_bh(&session->frwd_lock);
2489 memset(hdr, 0, sizeof(*hdr));
2490 fail_scsi_tasks(conn, -1, DID_ERROR);
2491 conn->tmf_state = TMF_INITIAL;
2492 spin_unlock_bh(&session->frwd_lock);
2493
2494 iscsi_start_tx(conn);
2495 goto done;
2496
2497unlock:
2498 spin_unlock_bh(&session->frwd_lock);
2499done:
2500 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2501 rc == SUCCESS ? "SUCCESS" : "FAILED");
2502 mutex_unlock(&session->eh_mutex);
2503 return rc;
2504}
2505EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2506
2507/**
2508 * iscsi_eh_recover_target - reset target and possibly the session
2509 * @sc: scsi command
2510 *
2511 * This will attempt to send a warm target reset. If that fails,
2512 * we will escalate to ERL0 session recovery.
2513 */
2514int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2515{
2516 int rc;
2517
2518 rc = iscsi_eh_target_reset(sc);
2519 if (rc == FAILED)
2520 rc = iscsi_eh_session_reset(sc);
2521 return rc;
2522}
2523EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2524
2525/*
2526 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2527 * should be accessed via kfifo_{get,put} on q->queue.
2528 * Optionally, the caller can obtain the array of object pointers
2529 * by passing in a non-NULL @items pointer
2530 */
2531int
2532iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2533{
2534 int i, num_arrays = 1;
2535
2536 memset(q, 0, sizeof(*q));
2537
2538 q->max = max;
2539
2540 /* If the user passed an items pointer, he wants a copy of
2541 * the array. */
2542 if (items)
2543 num_arrays++;
2544 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2545 if (q->pool == NULL)
2546 return -ENOMEM;
2547
2548 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2549
2550 for (i = 0; i < max; i++) {
2551 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2552 if (q->pool[i] == NULL) {
2553 q->max = i;
2554 goto enomem;
2555 }
2556 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2557 }
2558
2559 if (items) {
2560 *items = q->pool + max;
2561 memcpy(*items, q->pool, max * sizeof(void *));
2562 }
2563
2564 return 0;
2565
2566enomem:
2567 iscsi_pool_free(q);
2568 return -ENOMEM;
2569}
2570EXPORT_SYMBOL_GPL(iscsi_pool_init);
2571
2572void iscsi_pool_free(struct iscsi_pool *q)
2573{
2574 int i;
2575
2576 for (i = 0; i < q->max; i++)
2577 kfree(q->pool[i]);
2578 kfree(q->pool);
2579}
2580EXPORT_SYMBOL_GPL(iscsi_pool_free);
2581
2582/**
2583 * iscsi_host_add - add host to system
2584 * @shost: scsi host
2585 * @pdev: parent device
2586 *
2587 * This should be called by partial offload and software iscsi drivers
2588 * to add a host to the system.
2589 */
2590int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2591{
2592 if (!shost->can_queue)
2593 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2594
2595 if (!shost->cmd_per_lun)
2596 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2597
2598 if (!shost->transportt->eh_timed_out)
2599 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2600 return scsi_add_host(shost, pdev);
2601}
2602EXPORT_SYMBOL_GPL(iscsi_host_add);
2603
2604/**
2605 * iscsi_host_alloc - allocate a host and driver data
2606 * @sht: scsi host template
2607 * @dd_data_size: driver host data size
2608 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2609 *
2610 * This should be called by partial offload and software iscsi drivers.
2611 * To access the driver specific memory use the iscsi_host_priv() macro.
2612 */
2613struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2614 int dd_data_size, bool xmit_can_sleep)
2615{
2616 struct Scsi_Host *shost;
2617 struct iscsi_host *ihost;
2618
2619 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2620 if (!shost)
2621 return NULL;
2622 ihost = shost_priv(shost);
2623
2624 if (xmit_can_sleep) {
2625 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2626 "iscsi_q_%d", shost->host_no);
2627 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2628 if (!ihost->workq)
2629 goto free_host;
2630 }
2631
2632 spin_lock_init(&ihost->lock);
2633 ihost->state = ISCSI_HOST_SETUP;
2634 ihost->num_sessions = 0;
2635 init_waitqueue_head(&ihost->session_removal_wq);
2636 return shost;
2637
2638free_host:
2639 scsi_host_put(shost);
2640 return NULL;
2641}
2642EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2643
2644static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2645{
2646 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2647}
2648
2649/**
2650 * iscsi_host_remove - remove host and sessions
2651 * @shost: scsi host
2652 *
2653 * If there are any sessions left, this will initiate the removal and wait
2654 * for the completion.
2655 */
2656void iscsi_host_remove(struct Scsi_Host *shost)
2657{
2658 struct iscsi_host *ihost = shost_priv(shost);
2659 unsigned long flags;
2660
2661 spin_lock_irqsave(&ihost->lock, flags);
2662 ihost->state = ISCSI_HOST_REMOVED;
2663 spin_unlock_irqrestore(&ihost->lock, flags);
2664
2665 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2666 wait_event_interruptible(ihost->session_removal_wq,
2667 ihost->num_sessions == 0);
2668 if (signal_pending(current))
2669 flush_signals(current);
2670
2671 scsi_remove_host(shost);
2672 if (ihost->workq)
2673 destroy_workqueue(ihost->workq);
2674}
2675EXPORT_SYMBOL_GPL(iscsi_host_remove);
2676
2677void iscsi_host_free(struct Scsi_Host *shost)
2678{
2679 struct iscsi_host *ihost = shost_priv(shost);
2680
2681 kfree(ihost->netdev);
2682 kfree(ihost->hwaddress);
2683 kfree(ihost->initiatorname);
2684 scsi_host_put(shost);
2685}
2686EXPORT_SYMBOL_GPL(iscsi_host_free);
2687
2688static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2689{
2690 struct iscsi_host *ihost = shost_priv(shost);
2691 unsigned long flags;
2692
2693 shost = scsi_host_get(shost);
2694 if (!shost) {
2695 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2696 "of session teardown event because host already "
2697 "removed.\n");
2698 return;
2699 }
2700
2701 spin_lock_irqsave(&ihost->lock, flags);
2702 ihost->num_sessions--;
2703 if (ihost->num_sessions == 0)
2704 wake_up(&ihost->session_removal_wq);
2705 spin_unlock_irqrestore(&ihost->lock, flags);
2706 scsi_host_put(shost);
2707}
2708
2709/**
2710 * iscsi_session_setup - create iscsi cls session and host and session
2711 * @iscsit: iscsi transport template
2712 * @shost: scsi host
2713 * @cmds_max: session can queue
2714 * @cmd_task_size: LLD task private data size
2715 * @initial_cmdsn: initial CmdSN
2716 *
2717 * This can be used by software iscsi_transports that allocate
2718 * a session per scsi host.
2719 *
2720 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2721 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2722 * for nop handling and login/logout requests.
2723 */
2724struct iscsi_cls_session *
2725iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2726 uint16_t cmds_max, int dd_size, int cmd_task_size,
2727 uint32_t initial_cmdsn, unsigned int id)
2728{
2729 struct iscsi_host *ihost = shost_priv(shost);
2730 struct iscsi_session *session;
2731 struct iscsi_cls_session *cls_session;
2732 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2733 unsigned long flags;
2734
2735 spin_lock_irqsave(&ihost->lock, flags);
2736 if (ihost->state == ISCSI_HOST_REMOVED) {
2737 spin_unlock_irqrestore(&ihost->lock, flags);
2738 return NULL;
2739 }
2740 ihost->num_sessions++;
2741 spin_unlock_irqrestore(&ihost->lock, flags);
2742
2743 if (!total_cmds)
2744 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2745 /*
2746 * The iscsi layer needs some tasks for nop handling and tmfs,
2747 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2748 * + 1 command for scsi IO.
2749 */
2750 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2751 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2752 "must be a power of two that is at least %d.\n",
2753 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2754 goto dec_session_count;
2755 }
2756
2757 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2758 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2759 "must be a power of 2 less than or equal to %d.\n",
2760 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2761 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2762 }
2763
2764 if (!is_power_of_2(total_cmds)) {
2765 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2766 "must be a power of 2.\n", total_cmds);
2767 total_cmds = rounddown_pow_of_two(total_cmds);
2768 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2769 return NULL;
2770 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2771 total_cmds);
2772 }
2773 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2774
2775 cls_session = iscsi_alloc_session(shost, iscsit,
2776 sizeof(struct iscsi_session) +
2777 dd_size);
2778 if (!cls_session)
2779 goto dec_session_count;
2780 session = cls_session->dd_data;
2781 session->cls_session = cls_session;
2782 session->host = shost;
2783 session->state = ISCSI_STATE_FREE;
2784 session->fast_abort = 1;
2785 session->tgt_reset_timeout = 30;
2786 session->lu_reset_timeout = 15;
2787 session->abort_timeout = 10;
2788 session->scsi_cmds_max = scsi_cmds;
2789 session->cmds_max = total_cmds;
2790 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2791 session->exp_cmdsn = initial_cmdsn + 1;
2792 session->max_cmdsn = initial_cmdsn + 1;
2793 session->max_r2t = 1;
2794 session->tt = iscsit;
2795 session->dd_data = cls_session->dd_data + sizeof(*session);
2796
2797 mutex_init(&session->eh_mutex);
2798 spin_lock_init(&session->frwd_lock);
2799 spin_lock_init(&session->back_lock);
2800
2801 /* initialize SCSI PDU commands pool */
2802 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2803 (void***)&session->cmds,
2804 cmd_task_size + sizeof(struct iscsi_task)))
2805 goto cmdpool_alloc_fail;
2806
2807 /* pre-format cmds pool with ITT */
2808 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2809 struct iscsi_task *task = session->cmds[cmd_i];
2810
2811 if (cmd_task_size)
2812 task->dd_data = &task[1];
2813 task->itt = cmd_i;
2814 task->state = ISCSI_TASK_FREE;
2815 INIT_LIST_HEAD(&task->running);
2816 }
2817
2818 if (!try_module_get(iscsit->owner))
2819 goto module_get_fail;
2820
2821 if (iscsi_add_session(cls_session, id))
2822 goto cls_session_fail;
2823
2824 return cls_session;
2825
2826cls_session_fail:
2827 module_put(iscsit->owner);
2828module_get_fail:
2829 iscsi_pool_free(&session->cmdpool);
2830cmdpool_alloc_fail:
2831 iscsi_free_session(cls_session);
2832dec_session_count:
2833 iscsi_host_dec_session_cnt(shost);
2834 return NULL;
2835}
2836EXPORT_SYMBOL_GPL(iscsi_session_setup);
2837
2838/**
2839 * iscsi_session_teardown - destroy session, host, and cls_session
2840 * @cls_session: iscsi session
2841 *
2842 * The driver must have called iscsi_remove_session before
2843 * calling this.
2844 */
2845void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2846{
2847 struct iscsi_session *session = cls_session->dd_data;
2848 struct module *owner = cls_session->transport->owner;
2849 struct Scsi_Host *shost = session->host;
2850
2851 iscsi_pool_free(&session->cmdpool);
2852
2853 kfree(session->password);
2854 kfree(session->password_in);
2855 kfree(session->username);
2856 kfree(session->username_in);
2857 kfree(session->targetname);
2858 kfree(session->targetalias);
2859 kfree(session->initiatorname);
2860 kfree(session->boot_root);
2861 kfree(session->boot_nic);
2862 kfree(session->boot_target);
2863 kfree(session->ifacename);
2864 kfree(session->portal_type);
2865 kfree(session->discovery_parent_type);
2866
2867 iscsi_destroy_session(cls_session);
2868 iscsi_host_dec_session_cnt(shost);
2869 module_put(owner);
2870}
2871EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2872
2873/**
2874 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2875 * @cls_session: iscsi_cls_session
2876 * @dd_size: private driver data size
2877 * @conn_idx: cid
2878 */
2879struct iscsi_cls_conn *
2880iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2881 uint32_t conn_idx)
2882{
2883 struct iscsi_session *session = cls_session->dd_data;
2884 struct iscsi_conn *conn;
2885 struct iscsi_cls_conn *cls_conn;
2886 char *data;
2887
2888 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2889 conn_idx);
2890 if (!cls_conn)
2891 return NULL;
2892 conn = cls_conn->dd_data;
2893 memset(conn, 0, sizeof(*conn) + dd_size);
2894
2895 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2896 conn->session = session;
2897 conn->cls_conn = cls_conn;
2898 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2899 conn->id = conn_idx;
2900 conn->exp_statsn = 0;
2901 conn->tmf_state = TMF_INITIAL;
2902
2903 init_timer(&conn->transport_timer);
2904 conn->transport_timer.data = (unsigned long)conn;
2905 conn->transport_timer.function = iscsi_check_transport_timeouts;
2906
2907 INIT_LIST_HEAD(&conn->mgmtqueue);
2908 INIT_LIST_HEAD(&conn->cmdqueue);
2909 INIT_LIST_HEAD(&conn->requeue);
2910 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2911
2912 /* allocate login_task used for the login/text sequences */
2913 spin_lock_bh(&session->frwd_lock);
2914 if (!kfifo_out(&session->cmdpool.queue,
2915 (void*)&conn->login_task,
2916 sizeof(void*))) {
2917 spin_unlock_bh(&session->frwd_lock);
2918 goto login_task_alloc_fail;
2919 }
2920 spin_unlock_bh(&session->frwd_lock);
2921
2922 data = (char *) __get_free_pages(GFP_KERNEL,
2923 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2924 if (!data)
2925 goto login_task_data_alloc_fail;
2926 conn->login_task->data = conn->data = data;
2927
2928 init_timer(&conn->tmf_timer);
2929 init_waitqueue_head(&conn->ehwait);
2930
2931 return cls_conn;
2932
2933login_task_data_alloc_fail:
2934 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2935 sizeof(void*));
2936login_task_alloc_fail:
2937 iscsi_destroy_conn(cls_conn);
2938 return NULL;
2939}
2940EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2941
2942/**
2943 * iscsi_conn_teardown - teardown iscsi connection
2944 * cls_conn: iscsi class connection
2945 *
2946 * TODO: we may need to make this into a two step process
2947 * like scsi-mls remove + put host
2948 */
2949void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2950{
2951 struct iscsi_conn *conn = cls_conn->dd_data;
2952 struct iscsi_session *session = conn->session;
2953 unsigned long flags;
2954
2955 del_timer_sync(&conn->transport_timer);
2956
2957 spin_lock_bh(&session->frwd_lock);
2958 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2959 if (session->leadconn == conn) {
2960 /*
2961 * leading connection? then give up on recovery.
2962 */
2963 session->state = ISCSI_STATE_TERMINATE;
2964 wake_up(&conn->ehwait);
2965 }
2966 spin_unlock_bh(&session->frwd_lock);
2967
2968 /*
2969 * Block until all in-progress commands for this connection
2970 * time out or fail.
2971 */
2972 for (;;) {
2973 spin_lock_irqsave(session->host->host_lock, flags);
2974 if (!session->host->host_busy) { /* OK for ERL == 0 */
2975 spin_unlock_irqrestore(session->host->host_lock, flags);
2976 break;
2977 }
2978 spin_unlock_irqrestore(session->host->host_lock, flags);
2979 msleep_interruptible(500);
2980 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2981 "host_busy %d host_failed %d\n",
2982 session->host->host_busy,
2983 session->host->host_failed);
2984 /*
2985 * force eh_abort() to unblock
2986 */
2987 wake_up(&conn->ehwait);
2988 }
2989
2990 /* flush queued up work because we free the connection below */
2991 iscsi_suspend_tx(conn);
2992
2993 spin_lock_bh(&session->frwd_lock);
2994 free_pages((unsigned long) conn->data,
2995 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2996 kfree(conn->persistent_address);
2997 kfree(conn->local_ipaddr);
2998 /* regular RX path uses back_lock */
2999 spin_lock_bh(&session->back_lock);
3000 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3001 sizeof(void*));
3002 spin_unlock_bh(&session->back_lock);
3003 if (session->leadconn == conn)
3004 session->leadconn = NULL;
3005 spin_unlock_bh(&session->frwd_lock);
3006
3007 iscsi_destroy_conn(cls_conn);
3008}
3009EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3010
3011int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3012{
3013 struct iscsi_conn *conn = cls_conn->dd_data;
3014 struct iscsi_session *session = conn->session;
3015
3016 if (!session) {
3017 iscsi_conn_printk(KERN_ERR, conn,
3018 "can't start unbound connection\n");
3019 return -EPERM;
3020 }
3021
3022 if ((session->imm_data_en || !session->initial_r2t_en) &&
3023 session->first_burst > session->max_burst) {
3024 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3025 "first_burst %d max_burst %d\n",
3026 session->first_burst, session->max_burst);
3027 return -EINVAL;
3028 }
3029
3030 if (conn->ping_timeout && !conn->recv_timeout) {
3031 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3032 "zero. Using 5 seconds\n.");
3033 conn->recv_timeout = 5;
3034 }
3035
3036 if (conn->recv_timeout && !conn->ping_timeout) {
3037 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3038 "zero. Using 5 seconds.\n");
3039 conn->ping_timeout = 5;
3040 }
3041
3042 spin_lock_bh(&session->frwd_lock);
3043 conn->c_stage = ISCSI_CONN_STARTED;
3044 session->state = ISCSI_STATE_LOGGED_IN;
3045 session->queued_cmdsn = session->cmdsn;
3046
3047 conn->last_recv = jiffies;
3048 conn->last_ping = jiffies;
3049 if (conn->recv_timeout && conn->ping_timeout)
3050 mod_timer(&conn->transport_timer,
3051 jiffies + (conn->recv_timeout * HZ));
3052
3053 switch(conn->stop_stage) {
3054 case STOP_CONN_RECOVER:
3055 /*
3056 * unblock eh_abort() if it is blocked. re-try all
3057 * commands after successful recovery
3058 */
3059 conn->stop_stage = 0;
3060 conn->tmf_state = TMF_INITIAL;
3061 session->age++;
3062 if (session->age == 16)
3063 session->age = 0;
3064 break;
3065 case STOP_CONN_TERM:
3066 conn->stop_stage = 0;
3067 break;
3068 default:
3069 break;
3070 }
3071 spin_unlock_bh(&session->frwd_lock);
3072
3073 iscsi_unblock_session(session->cls_session);
3074 wake_up(&conn->ehwait);
3075 return 0;
3076}
3077EXPORT_SYMBOL_GPL(iscsi_conn_start);
3078
3079static void
3080fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3081{
3082 struct iscsi_task *task;
3083 int i, state;
3084
3085 for (i = 0; i < conn->session->cmds_max; i++) {
3086 task = conn->session->cmds[i];
3087 if (task->sc)
3088 continue;
3089
3090 if (task->state == ISCSI_TASK_FREE)
3091 continue;
3092
3093 ISCSI_DBG_SESSION(conn->session,
3094 "failing mgmt itt 0x%x state %d\n",
3095 task->itt, task->state);
3096 state = ISCSI_TASK_ABRT_SESS_RECOV;
3097 if (task->state == ISCSI_TASK_PENDING)
3098 state = ISCSI_TASK_COMPLETED;
3099 iscsi_complete_task(task, state);
3100
3101 }
3102}
3103
3104static void iscsi_start_session_recovery(struct iscsi_session *session,
3105 struct iscsi_conn *conn, int flag)
3106{
3107 int old_stop_stage;
3108
3109 mutex_lock(&session->eh_mutex);
3110 spin_lock_bh(&session->frwd_lock);
3111 if (conn->stop_stage == STOP_CONN_TERM) {
3112 spin_unlock_bh(&session->frwd_lock);
3113 mutex_unlock(&session->eh_mutex);
3114 return;
3115 }
3116
3117 /*
3118 * When this is called for the in_login state, we only want to clean
3119 * up the login task and connection. We do not need to block and set
3120 * the recovery state again
3121 */
3122 if (flag == STOP_CONN_TERM)
3123 session->state = ISCSI_STATE_TERMINATE;
3124 else if (conn->stop_stage != STOP_CONN_RECOVER)
3125 session->state = ISCSI_STATE_IN_RECOVERY;
3126
3127 old_stop_stage = conn->stop_stage;
3128 conn->stop_stage = flag;
3129 spin_unlock_bh(&session->frwd_lock);
3130
3131 del_timer_sync(&conn->transport_timer);
3132 iscsi_suspend_tx(conn);
3133
3134 spin_lock_bh(&session->frwd_lock);
3135 conn->c_stage = ISCSI_CONN_STOPPED;
3136 spin_unlock_bh(&session->frwd_lock);
3137
3138 /*
3139 * for connection level recovery we should not calculate
3140 * header digest. conn->hdr_size used for optimization
3141 * in hdr_extract() and will be re-negotiated at
3142 * set_param() time.
3143 */
3144 if (flag == STOP_CONN_RECOVER) {
3145 conn->hdrdgst_en = 0;
3146 conn->datadgst_en = 0;
3147 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3148 old_stop_stage != STOP_CONN_RECOVER) {
3149 ISCSI_DBG_SESSION(session, "blocking session\n");
3150 iscsi_block_session(session->cls_session);
3151 }
3152 }
3153
3154 /*
3155 * flush queues.
3156 */
3157 spin_lock_bh(&session->frwd_lock);
3158 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3159 fail_mgmt_tasks(session, conn);
3160 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3161 spin_unlock_bh(&session->frwd_lock);
3162 mutex_unlock(&session->eh_mutex);
3163}
3164
3165void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3166{
3167 struct iscsi_conn *conn = cls_conn->dd_data;
3168 struct iscsi_session *session = conn->session;
3169
3170 switch (flag) {
3171 case STOP_CONN_RECOVER:
3172 case STOP_CONN_TERM:
3173 iscsi_start_session_recovery(session, conn, flag);
3174 break;
3175 default:
3176 iscsi_conn_printk(KERN_ERR, conn,
3177 "invalid stop flag %d\n", flag);
3178 }
3179}
3180EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3181
3182int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3183 struct iscsi_cls_conn *cls_conn, int is_leading)
3184{
3185 struct iscsi_session *session = cls_session->dd_data;
3186 struct iscsi_conn *conn = cls_conn->dd_data;
3187
3188 spin_lock_bh(&session->frwd_lock);
3189 if (is_leading)
3190 session->leadconn = conn;
3191 spin_unlock_bh(&session->frwd_lock);
3192
3193 /*
3194 * Unblock xmitworker(), Login Phase will pass through.
3195 */
3196 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3197 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3198 return 0;
3199}
3200EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3201
3202int iscsi_switch_str_param(char **param, char *new_val_buf)
3203{
3204 char *new_val;
3205
3206 if (*param) {
3207 if (!strcmp(*param, new_val_buf))
3208 return 0;
3209 }
3210
3211 new_val = kstrdup(new_val_buf, GFP_NOIO);
3212 if (!new_val)
3213 return -ENOMEM;
3214
3215 kfree(*param);
3216 *param = new_val;
3217 return 0;
3218}
3219EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3220
3221int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3222 enum iscsi_param param, char *buf, int buflen)
3223{
3224 struct iscsi_conn *conn = cls_conn->dd_data;
3225 struct iscsi_session *session = conn->session;
3226 int val;
3227
3228 switch(param) {
3229 case ISCSI_PARAM_FAST_ABORT:
3230 sscanf(buf, "%d", &session->fast_abort);
3231 break;
3232 case ISCSI_PARAM_ABORT_TMO:
3233 sscanf(buf, "%d", &session->abort_timeout);
3234 break;
3235 case ISCSI_PARAM_LU_RESET_TMO:
3236 sscanf(buf, "%d", &session->lu_reset_timeout);
3237 break;
3238 case ISCSI_PARAM_TGT_RESET_TMO:
3239 sscanf(buf, "%d", &session->tgt_reset_timeout);
3240 break;
3241 case ISCSI_PARAM_PING_TMO:
3242 sscanf(buf, "%d", &conn->ping_timeout);
3243 break;
3244 case ISCSI_PARAM_RECV_TMO:
3245 sscanf(buf, "%d", &conn->recv_timeout);
3246 break;
3247 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3248 sscanf(buf, "%d", &conn->max_recv_dlength);
3249 break;
3250 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3251 sscanf(buf, "%d", &conn->max_xmit_dlength);
3252 break;
3253 case ISCSI_PARAM_HDRDGST_EN:
3254 sscanf(buf, "%d", &conn->hdrdgst_en);
3255 break;
3256 case ISCSI_PARAM_DATADGST_EN:
3257 sscanf(buf, "%d", &conn->datadgst_en);
3258 break;
3259 case ISCSI_PARAM_INITIAL_R2T_EN:
3260 sscanf(buf, "%d", &session->initial_r2t_en);
3261 break;
3262 case ISCSI_PARAM_MAX_R2T:
3263 sscanf(buf, "%hu", &session->max_r2t);
3264 break;
3265 case ISCSI_PARAM_IMM_DATA_EN:
3266 sscanf(buf, "%d", &session->imm_data_en);
3267 break;
3268 case ISCSI_PARAM_FIRST_BURST:
3269 sscanf(buf, "%d", &session->first_burst);
3270 break;
3271 case ISCSI_PARAM_MAX_BURST:
3272 sscanf(buf, "%d", &session->max_burst);
3273 break;
3274 case ISCSI_PARAM_PDU_INORDER_EN:
3275 sscanf(buf, "%d", &session->pdu_inorder_en);
3276 break;
3277 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3278 sscanf(buf, "%d", &session->dataseq_inorder_en);
3279 break;
3280 case ISCSI_PARAM_ERL:
3281 sscanf(buf, "%d", &session->erl);
3282 break;
3283 case ISCSI_PARAM_EXP_STATSN:
3284 sscanf(buf, "%u", &conn->exp_statsn);
3285 break;
3286 case ISCSI_PARAM_USERNAME:
3287 return iscsi_switch_str_param(&session->username, buf);
3288 case ISCSI_PARAM_USERNAME_IN:
3289 return iscsi_switch_str_param(&session->username_in, buf);
3290 case ISCSI_PARAM_PASSWORD:
3291 return iscsi_switch_str_param(&session->password, buf);
3292 case ISCSI_PARAM_PASSWORD_IN:
3293 return iscsi_switch_str_param(&session->password_in, buf);
3294 case ISCSI_PARAM_TARGET_NAME:
3295 return iscsi_switch_str_param(&session->targetname, buf);
3296 case ISCSI_PARAM_TARGET_ALIAS:
3297 return iscsi_switch_str_param(&session->targetalias, buf);
3298 case ISCSI_PARAM_TPGT:
3299 sscanf(buf, "%d", &session->tpgt);
3300 break;
3301 case ISCSI_PARAM_PERSISTENT_PORT:
3302 sscanf(buf, "%d", &conn->persistent_port);
3303 break;
3304 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3305 return iscsi_switch_str_param(&conn->persistent_address, buf);
3306 case ISCSI_PARAM_IFACE_NAME:
3307 return iscsi_switch_str_param(&session->ifacename, buf);
3308 case ISCSI_PARAM_INITIATOR_NAME:
3309 return iscsi_switch_str_param(&session->initiatorname, buf);
3310 case ISCSI_PARAM_BOOT_ROOT:
3311 return iscsi_switch_str_param(&session->boot_root, buf);
3312 case ISCSI_PARAM_BOOT_NIC:
3313 return iscsi_switch_str_param(&session->boot_nic, buf);
3314 case ISCSI_PARAM_BOOT_TARGET:
3315 return iscsi_switch_str_param(&session->boot_target, buf);
3316 case ISCSI_PARAM_PORTAL_TYPE:
3317 return iscsi_switch_str_param(&session->portal_type, buf);
3318 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3319 return iscsi_switch_str_param(&session->discovery_parent_type,
3320 buf);
3321 case ISCSI_PARAM_DISCOVERY_SESS:
3322 sscanf(buf, "%d", &val);
3323 session->discovery_sess = !!val;
3324 break;
3325 case ISCSI_PARAM_LOCAL_IPADDR:
3326 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3327 default:
3328 return -ENOSYS;
3329 }
3330
3331 return 0;
3332}
3333EXPORT_SYMBOL_GPL(iscsi_set_param);
3334
3335int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3336 enum iscsi_param param, char *buf)
3337{
3338 struct iscsi_session *session = cls_session->dd_data;
3339 int len;
3340
3341 switch(param) {
3342 case ISCSI_PARAM_FAST_ABORT:
3343 len = sprintf(buf, "%d\n", session->fast_abort);
3344 break;
3345 case ISCSI_PARAM_ABORT_TMO:
3346 len = sprintf(buf, "%d\n", session->abort_timeout);
3347 break;
3348 case ISCSI_PARAM_LU_RESET_TMO:
3349 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3350 break;
3351 case ISCSI_PARAM_TGT_RESET_TMO:
3352 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3353 break;
3354 case ISCSI_PARAM_INITIAL_R2T_EN:
3355 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3356 break;
3357 case ISCSI_PARAM_MAX_R2T:
3358 len = sprintf(buf, "%hu\n", session->max_r2t);
3359 break;
3360 case ISCSI_PARAM_IMM_DATA_EN:
3361 len = sprintf(buf, "%d\n", session->imm_data_en);
3362 break;
3363 case ISCSI_PARAM_FIRST_BURST:
3364 len = sprintf(buf, "%u\n", session->first_burst);
3365 break;
3366 case ISCSI_PARAM_MAX_BURST:
3367 len = sprintf(buf, "%u\n", session->max_burst);
3368 break;
3369 case ISCSI_PARAM_PDU_INORDER_EN:
3370 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3371 break;
3372 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3373 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3374 break;
3375 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3376 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3377 break;
3378 case ISCSI_PARAM_ERL:
3379 len = sprintf(buf, "%d\n", session->erl);
3380 break;
3381 case ISCSI_PARAM_TARGET_NAME:
3382 len = sprintf(buf, "%s\n", session->targetname);
3383 break;
3384 case ISCSI_PARAM_TARGET_ALIAS:
3385 len = sprintf(buf, "%s\n", session->targetalias);
3386 break;
3387 case ISCSI_PARAM_TPGT:
3388 len = sprintf(buf, "%d\n", session->tpgt);
3389 break;
3390 case ISCSI_PARAM_USERNAME:
3391 len = sprintf(buf, "%s\n", session->username);
3392 break;
3393 case ISCSI_PARAM_USERNAME_IN:
3394 len = sprintf(buf, "%s\n", session->username_in);
3395 break;
3396 case ISCSI_PARAM_PASSWORD:
3397 len = sprintf(buf, "%s\n", session->password);
3398 break;
3399 case ISCSI_PARAM_PASSWORD_IN:
3400 len = sprintf(buf, "%s\n", session->password_in);
3401 break;
3402 case ISCSI_PARAM_IFACE_NAME:
3403 len = sprintf(buf, "%s\n", session->ifacename);
3404 break;
3405 case ISCSI_PARAM_INITIATOR_NAME:
3406 len = sprintf(buf, "%s\n", session->initiatorname);
3407 break;
3408 case ISCSI_PARAM_BOOT_ROOT:
3409 len = sprintf(buf, "%s\n", session->boot_root);
3410 break;
3411 case ISCSI_PARAM_BOOT_NIC:
3412 len = sprintf(buf, "%s\n", session->boot_nic);
3413 break;
3414 case ISCSI_PARAM_BOOT_TARGET:
3415 len = sprintf(buf, "%s\n", session->boot_target);
3416 break;
3417 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3418 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3419 break;
3420 case ISCSI_PARAM_DISCOVERY_SESS:
3421 len = sprintf(buf, "%u\n", session->discovery_sess);
3422 break;
3423 case ISCSI_PARAM_PORTAL_TYPE:
3424 len = sprintf(buf, "%s\n", session->portal_type);
3425 break;
3426 case ISCSI_PARAM_CHAP_AUTH_EN:
3427 len = sprintf(buf, "%u\n", session->chap_auth_en);
3428 break;
3429 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3430 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3431 break;
3432 case ISCSI_PARAM_BIDI_CHAP_EN:
3433 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3434 break;
3435 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3436 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3437 break;
3438 case ISCSI_PARAM_DEF_TIME2WAIT:
3439 len = sprintf(buf, "%d\n", session->time2wait);
3440 break;
3441 case ISCSI_PARAM_DEF_TIME2RETAIN:
3442 len = sprintf(buf, "%d\n", session->time2retain);
3443 break;
3444 case ISCSI_PARAM_TSID:
3445 len = sprintf(buf, "%u\n", session->tsid);
3446 break;
3447 case ISCSI_PARAM_ISID:
3448 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3449 session->isid[0], session->isid[1],
3450 session->isid[2], session->isid[3],
3451 session->isid[4], session->isid[5]);
3452 break;
3453 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3454 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3455 break;
3456 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3457 if (session->discovery_parent_type)
3458 len = sprintf(buf, "%s\n",
3459 session->discovery_parent_type);
3460 else
3461 len = sprintf(buf, "\n");
3462 break;
3463 default:
3464 return -ENOSYS;
3465 }
3466
3467 return len;
3468}
3469EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3470
3471int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3472 enum iscsi_param param, char *buf)
3473{
3474 struct sockaddr_in6 *sin6 = NULL;
3475 struct sockaddr_in *sin = NULL;
3476 int len;
3477
3478 switch (addr->ss_family) {
3479 case AF_INET:
3480 sin = (struct sockaddr_in *)addr;
3481 break;
3482 case AF_INET6:
3483 sin6 = (struct sockaddr_in6 *)addr;
3484 break;
3485 default:
3486 return -EINVAL;
3487 }
3488
3489 switch (param) {
3490 case ISCSI_PARAM_CONN_ADDRESS:
3491 case ISCSI_HOST_PARAM_IPADDRESS:
3492 if (sin)
3493 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3494 else
3495 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3496 break;
3497 case ISCSI_PARAM_CONN_PORT:
3498 if (sin)
3499 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3500 else
3501 len = sprintf(buf, "%hu\n",
3502 be16_to_cpu(sin6->sin6_port));
3503 break;
3504 default:
3505 return -EINVAL;
3506 }
3507
3508 return len;
3509}
3510EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3511
3512int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3513 enum iscsi_param param, char *buf)
3514{
3515 struct iscsi_conn *conn = cls_conn->dd_data;
3516 int len;
3517
3518 switch(param) {
3519 case ISCSI_PARAM_PING_TMO:
3520 len = sprintf(buf, "%u\n", conn->ping_timeout);
3521 break;
3522 case ISCSI_PARAM_RECV_TMO:
3523 len = sprintf(buf, "%u\n", conn->recv_timeout);
3524 break;
3525 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3526 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3527 break;
3528 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3529 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3530 break;
3531 case ISCSI_PARAM_HDRDGST_EN:
3532 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3533 break;
3534 case ISCSI_PARAM_DATADGST_EN:
3535 len = sprintf(buf, "%d\n", conn->datadgst_en);
3536 break;
3537 case ISCSI_PARAM_IFMARKER_EN:
3538 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3539 break;
3540 case ISCSI_PARAM_OFMARKER_EN:
3541 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3542 break;
3543 case ISCSI_PARAM_EXP_STATSN:
3544 len = sprintf(buf, "%u\n", conn->exp_statsn);
3545 break;
3546 case ISCSI_PARAM_PERSISTENT_PORT:
3547 len = sprintf(buf, "%d\n", conn->persistent_port);
3548 break;
3549 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3550 len = sprintf(buf, "%s\n", conn->persistent_address);
3551 break;
3552 case ISCSI_PARAM_STATSN:
3553 len = sprintf(buf, "%u\n", conn->statsn);
3554 break;
3555 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3556 len = sprintf(buf, "%u\n", conn->max_segment_size);
3557 break;
3558 case ISCSI_PARAM_KEEPALIVE_TMO:
3559 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3560 break;
3561 case ISCSI_PARAM_LOCAL_PORT:
3562 len = sprintf(buf, "%u\n", conn->local_port);
3563 break;
3564 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3565 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3566 break;
3567 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3568 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3569 break;
3570 case ISCSI_PARAM_TCP_WSF_DISABLE:
3571 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3572 break;
3573 case ISCSI_PARAM_TCP_TIMER_SCALE:
3574 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3575 break;
3576 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3577 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3578 break;
3579 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3580 len = sprintf(buf, "%u\n", conn->fragment_disable);
3581 break;
3582 case ISCSI_PARAM_IPV4_TOS:
3583 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3584 break;
3585 case ISCSI_PARAM_IPV6_TC:
3586 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3587 break;
3588 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3589 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3590 break;
3591 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3592 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3593 break;
3594 case ISCSI_PARAM_TCP_XMIT_WSF:
3595 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3596 break;
3597 case ISCSI_PARAM_TCP_RECV_WSF:
3598 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3599 break;
3600 case ISCSI_PARAM_LOCAL_IPADDR:
3601 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3602 break;
3603 default:
3604 return -ENOSYS;
3605 }
3606
3607 return len;
3608}
3609EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3610
3611int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3612 char *buf)
3613{
3614 struct iscsi_host *ihost = shost_priv(shost);
3615 int len;
3616
3617 switch (param) {
3618 case ISCSI_HOST_PARAM_NETDEV_NAME:
3619 len = sprintf(buf, "%s\n", ihost->netdev);
3620 break;
3621 case ISCSI_HOST_PARAM_HWADDRESS:
3622 len = sprintf(buf, "%s\n", ihost->hwaddress);
3623 break;
3624 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3625 len = sprintf(buf, "%s\n", ihost->initiatorname);
3626 break;
3627 default:
3628 return -ENOSYS;
3629 }
3630
3631 return len;
3632}
3633EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3634
3635int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3636 char *buf, int buflen)
3637{
3638 struct iscsi_host *ihost = shost_priv(shost);
3639
3640 switch (param) {
3641 case ISCSI_HOST_PARAM_NETDEV_NAME:
3642 return iscsi_switch_str_param(&ihost->netdev, buf);
3643 case ISCSI_HOST_PARAM_HWADDRESS:
3644 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3645 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3646 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3647 default:
3648 return -ENOSYS;
3649 }
3650
3651 return 0;
3652}
3653EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3654
3655MODULE_AUTHOR("Mike Christie");
3656MODULE_DESCRIPTION("iSCSI library functions");
3657MODULE_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 * if the window closed with IO queued, then kick the
117 * xmit thread
118 */
119 if (!list_empty(&session->leadconn->cmdqueue) ||
120 !list_empty(&session->leadconn->mgmtqueue))
121 iscsi_conn_queue_work(session->leadconn);
122 }
123}
124
125void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
126{
127 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
128 be32_to_cpu(hdr->max_cmdsn));
129}
130EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
131
132/**
133 * iscsi_prep_data_out_pdu - initialize Data-Out
134 * @task: scsi command task
135 * @r2t: R2T info
136 * @hdr: iscsi data in pdu
137 *
138 * Notes:
139 * Initialize Data-Out within this R2T sequence and finds
140 * proper data_offset within this SCSI command.
141 *
142 * This function is called with connection lock taken.
143 **/
144void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
145 struct iscsi_data *hdr)
146{
147 struct iscsi_conn *conn = task->conn;
148 unsigned int left = r2t->data_length - r2t->sent;
149
150 task->hdr_len = sizeof(struct iscsi_data);
151
152 memset(hdr, 0, sizeof(struct iscsi_data));
153 hdr->ttt = r2t->ttt;
154 hdr->datasn = cpu_to_be32(r2t->datasn);
155 r2t->datasn++;
156 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
157 hdr->lun = task->lun;
158 hdr->itt = task->hdr_itt;
159 hdr->exp_statsn = r2t->exp_statsn;
160 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
161 if (left > conn->max_xmit_dlength) {
162 hton24(hdr->dlength, conn->max_xmit_dlength);
163 r2t->data_count = conn->max_xmit_dlength;
164 hdr->flags = 0;
165 } else {
166 hton24(hdr->dlength, left);
167 r2t->data_count = left;
168 hdr->flags = ISCSI_FLAG_CMD_FINAL;
169 }
170 conn->dataout_pdus_cnt++;
171}
172EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
173
174static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
175{
176 unsigned exp_len = task->hdr_len + len;
177
178 if (exp_len > task->hdr_max) {
179 WARN_ON(1);
180 return -EINVAL;
181 }
182
183 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
184 task->hdr_len = exp_len;
185 return 0;
186}
187
188/*
189 * make an extended cdb AHS
190 */
191static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
192{
193 struct scsi_cmnd *cmd = task->sc;
194 unsigned rlen, pad_len;
195 unsigned short ahslength;
196 struct iscsi_ecdb_ahdr *ecdb_ahdr;
197 int rc;
198
199 ecdb_ahdr = iscsi_next_hdr(task);
200 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
201
202 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
203 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
204
205 pad_len = iscsi_padding(rlen);
206
207 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
208 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
209 if (rc)
210 return rc;
211
212 if (pad_len)
213 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
214
215 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
216 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
217 ecdb_ahdr->reserved = 0;
218 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
219
220 ISCSI_DBG_SESSION(task->conn->session,
221 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
222 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
223 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
224 task->hdr_len);
225 return 0;
226}
227
228static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
229{
230 struct scsi_cmnd *sc = task->sc;
231 struct iscsi_rlength_ahdr *rlen_ahdr;
232 int rc;
233
234 rlen_ahdr = iscsi_next_hdr(task);
235 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
236 if (rc)
237 return rc;
238
239 rlen_ahdr->ahslength =
240 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
241 sizeof(rlen_ahdr->reserved));
242 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
243 rlen_ahdr->reserved = 0;
244 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
245
246 ISCSI_DBG_SESSION(task->conn->session,
247 "bidi-in rlen_ahdr->read_length(%d) "
248 "rlen_ahdr->ahslength(%d)\n",
249 be32_to_cpu(rlen_ahdr->read_length),
250 be16_to_cpu(rlen_ahdr->ahslength));
251 return 0;
252}
253
254/**
255 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
256 * @task: iscsi task
257 * @opcode: opcode to check for
258 *
259 * During TMF a task has to be checked if it's affected.
260 * All unrelated I/O can be passed through, but I/O to the
261 * affected LUN should be restricted.
262 * If 'fast_abort' is set we won't be sending any I/O to the
263 * affected LUN.
264 * Otherwise the target is waiting for all TTTs to be completed,
265 * so we have to send all outstanding Data-Out PDUs to the target.
266 */
267static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
268{
269 struct iscsi_conn *conn = task->conn;
270 struct iscsi_tm *tmf = &conn->tmhdr;
271 unsigned int hdr_lun;
272
273 if (conn->tmf_state == TMF_INITIAL)
274 return 0;
275
276 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
277 return 0;
278
279 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
280 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
281 /*
282 * Allow PDUs for unrelated LUNs
283 */
284 hdr_lun = scsilun_to_int(&tmf->lun);
285 if (hdr_lun != task->sc->device->lun)
286 return 0;
287 /* fall through */
288 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
289 /*
290 * Fail all SCSI cmd PDUs
291 */
292 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
293 iscsi_conn_printk(KERN_INFO, conn,
294 "task [op %x/%x itt "
295 "0x%x/0x%x] "
296 "rejected.\n",
297 task->hdr->opcode, opcode,
298 task->itt, task->hdr_itt);
299 return -EACCES;
300 }
301 /*
302 * And also all data-out PDUs in response to R2T
303 * if fast_abort is set.
304 */
305 if (conn->session->fast_abort) {
306 iscsi_conn_printk(KERN_INFO, conn,
307 "task [op %x/%x itt "
308 "0x%x/0x%x] fast abort.\n",
309 task->hdr->opcode, opcode,
310 task->itt, task->hdr_itt);
311 return -EACCES;
312 }
313 break;
314 case ISCSI_TM_FUNC_ABORT_TASK:
315 /*
316 * the caller has already checked if the task
317 * they want to abort was in the pending queue so if
318 * we are here the cmd pdu has gone out already, and
319 * we will only hit this for data-outs
320 */
321 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
322 task->hdr_itt == tmf->rtt) {
323 ISCSI_DBG_SESSION(conn->session,
324 "Preventing task %x/%x from sending "
325 "data-out due to abort task in "
326 "progress\n", task->itt,
327 task->hdr_itt);
328 return -EACCES;
329 }
330 break;
331 }
332
333 return 0;
334}
335
336/**
337 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
338 * @task: iscsi task
339 *
340 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
341 * fields like dlength or final based on how much data it sends
342 */
343static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
344{
345 struct iscsi_conn *conn = task->conn;
346 struct iscsi_session *session = conn->session;
347 struct scsi_cmnd *sc = task->sc;
348 struct iscsi_scsi_req *hdr;
349 unsigned hdrlength, cmd_len;
350 itt_t itt;
351 int rc;
352
353 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
354 if (rc)
355 return rc;
356
357 if (conn->session->tt->alloc_pdu) {
358 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
359 if (rc)
360 return rc;
361 }
362 hdr = (struct iscsi_scsi_req *)task->hdr;
363 itt = hdr->itt;
364 memset(hdr, 0, sizeof(*hdr));
365
366 if (session->tt->parse_pdu_itt)
367 hdr->itt = task->hdr_itt = itt;
368 else
369 hdr->itt = task->hdr_itt = build_itt(task->itt,
370 task->conn->session->age);
371 task->hdr_len = 0;
372 rc = iscsi_add_hdr(task, sizeof(*hdr));
373 if (rc)
374 return rc;
375 hdr->opcode = ISCSI_OP_SCSI_CMD;
376 hdr->flags = ISCSI_ATTR_SIMPLE;
377 int_to_scsilun(sc->device->lun, &hdr->lun);
378 task->lun = hdr->lun;
379 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
380 cmd_len = sc->cmd_len;
381 if (cmd_len < ISCSI_CDB_SIZE)
382 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
383 else if (cmd_len > ISCSI_CDB_SIZE) {
384 rc = iscsi_prep_ecdb_ahs(task);
385 if (rc)
386 return rc;
387 cmd_len = ISCSI_CDB_SIZE;
388 }
389 memcpy(hdr->cdb, sc->cmnd, cmd_len);
390
391 task->imm_count = 0;
392 if (scsi_bidi_cmnd(sc)) {
393 hdr->flags |= ISCSI_FLAG_CMD_READ;
394 rc = iscsi_prep_bidi_ahs(task);
395 if (rc)
396 return rc;
397 }
398 if (sc->sc_data_direction == DMA_TO_DEVICE) {
399 unsigned out_len = scsi_out(sc)->length;
400 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
401
402 hdr->data_length = cpu_to_be32(out_len);
403 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
404 /*
405 * Write counters:
406 *
407 * imm_count bytes to be sent right after
408 * SCSI PDU Header
409 *
410 * unsol_count bytes(as Data-Out) to be sent
411 * without R2T ack right after
412 * immediate data
413 *
414 * r2t data_length bytes to be sent via R2T ack's
415 *
416 * pad_count bytes to be sent as zero-padding
417 */
418 memset(r2t, 0, sizeof(*r2t));
419
420 if (session->imm_data_en) {
421 if (out_len >= session->first_burst)
422 task->imm_count = min(session->first_burst,
423 conn->max_xmit_dlength);
424 else
425 task->imm_count = min(out_len,
426 conn->max_xmit_dlength);
427 hton24(hdr->dlength, task->imm_count);
428 } else
429 zero_data(hdr->dlength);
430
431 if (!session->initial_r2t_en) {
432 r2t->data_length = min(session->first_burst, out_len) -
433 task->imm_count;
434 r2t->data_offset = task->imm_count;
435 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
436 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
437 }
438
439 if (!task->unsol_r2t.data_length)
440 /* No unsolicit Data-Out's */
441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 } else {
443 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
444 zero_data(hdr->dlength);
445 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
446
447 if (sc->sc_data_direction == DMA_FROM_DEVICE)
448 hdr->flags |= ISCSI_FLAG_CMD_READ;
449 }
450
451 /* calculate size of additional header segments (AHSs) */
452 hdrlength = task->hdr_len - sizeof(*hdr);
453
454 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
455 hdrlength /= ISCSI_PAD_LEN;
456
457 WARN_ON(hdrlength >= 256);
458 hdr->hlength = hdrlength & 0xFF;
459 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
460
461 if (session->tt->init_task && session->tt->init_task(task))
462 return -EIO;
463
464 task->state = ISCSI_TASK_RUNNING;
465 session->cmdsn++;
466
467 conn->scsicmd_pdus_cnt++;
468 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
469 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
470 scsi_bidi_cmnd(sc) ? "bidirectional" :
471 sc->sc_data_direction == DMA_TO_DEVICE ?
472 "write" : "read", conn->id, sc, sc->cmnd[0],
473 task->itt, scsi_bufflen(sc),
474 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
475 session->cmdsn,
476 session->max_cmdsn - session->exp_cmdsn + 1);
477 return 0;
478}
479
480/**
481 * iscsi_free_task - free a task
482 * @task: iscsi cmd task
483 *
484 * Must be called with session lock.
485 * This function returns the scsi command to scsi-ml or cleans
486 * up mgmt tasks then returns the task to the pool.
487 */
488static void iscsi_free_task(struct iscsi_task *task)
489{
490 struct iscsi_conn *conn = task->conn;
491 struct iscsi_session *session = conn->session;
492 struct scsi_cmnd *sc = task->sc;
493 int oldstate = task->state;
494
495 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
496 task->itt, task->state, task->sc);
497
498 session->tt->cleanup_task(task);
499 task->state = ISCSI_TASK_FREE;
500 task->sc = NULL;
501 /*
502 * login task is preallocated so do not free
503 */
504 if (conn->login_task == task)
505 return;
506
507 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
508
509 if (sc) {
510 task->sc = NULL;
511 /* SCSI eh reuses commands to verify us */
512 sc->SCp.ptr = NULL;
513 /*
514 * queue command may call this to free the task, so
515 * it will decide how to return sc to scsi-ml.
516 */
517 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
518 sc->scsi_done(sc);
519 }
520}
521
522void __iscsi_get_task(struct iscsi_task *task)
523{
524 atomic_inc(&task->refcount);
525}
526EXPORT_SYMBOL_GPL(__iscsi_get_task);
527
528void __iscsi_put_task(struct iscsi_task *task)
529{
530 if (atomic_dec_and_test(&task->refcount))
531 iscsi_free_task(task);
532}
533EXPORT_SYMBOL_GPL(__iscsi_put_task);
534
535void iscsi_put_task(struct iscsi_task *task)
536{
537 struct iscsi_session *session = task->conn->session;
538
539 spin_lock_bh(&session->lock);
540 __iscsi_put_task(task);
541 spin_unlock_bh(&session->lock);
542}
543EXPORT_SYMBOL_GPL(iscsi_put_task);
544
545/**
546 * iscsi_complete_task - finish a task
547 * @task: iscsi cmd task
548 * @state: state to complete task with
549 *
550 * Must be called with session lock.
551 */
552static void iscsi_complete_task(struct iscsi_task *task, int state)
553{
554 struct iscsi_conn *conn = task->conn;
555
556 ISCSI_DBG_SESSION(conn->session,
557 "complete task itt 0x%x state %d sc %p\n",
558 task->itt, task->state, task->sc);
559 if (task->state == ISCSI_TASK_COMPLETED ||
560 task->state == ISCSI_TASK_ABRT_TMF ||
561 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
562 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
563 return;
564 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
565 task->state = state;
566
567 if (!list_empty(&task->running))
568 list_del_init(&task->running);
569
570 if (conn->task == task)
571 conn->task = NULL;
572
573 if (conn->ping_task == task)
574 conn->ping_task = NULL;
575
576 /* release get from queueing */
577 __iscsi_put_task(task);
578}
579
580/**
581 * iscsi_complete_scsi_task - finish scsi task normally
582 * @task: iscsi task for scsi cmd
583 * @exp_cmdsn: expected cmd sn in cpu format
584 * @max_cmdsn: max cmd sn in cpu format
585 *
586 * This is used when drivers do not need or cannot perform
587 * lower level pdu processing.
588 *
589 * Called with session lock
590 */
591void iscsi_complete_scsi_task(struct iscsi_task *task,
592 uint32_t exp_cmdsn, uint32_t max_cmdsn)
593{
594 struct iscsi_conn *conn = task->conn;
595
596 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
597
598 conn->last_recv = jiffies;
599 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
600 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
601}
602EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
603
604
605/*
606 * session lock must be held and if not called for a task that is
607 * still pending or from the xmit thread, then xmit thread must
608 * be suspended.
609 */
610static void fail_scsi_task(struct iscsi_task *task, int err)
611{
612 struct iscsi_conn *conn = task->conn;
613 struct scsi_cmnd *sc;
614 int state;
615
616 /*
617 * if a command completes and we get a successful tmf response
618 * we will hit this because the scsi eh abort code does not take
619 * a ref to the task.
620 */
621 sc = task->sc;
622 if (!sc)
623 return;
624
625 if (task->state == ISCSI_TASK_PENDING) {
626 /*
627 * cmd never made it to the xmit thread, so we should not count
628 * the cmd in the sequencing
629 */
630 conn->session->queued_cmdsn--;
631 /* it was never sent so just complete like normal */
632 state = ISCSI_TASK_COMPLETED;
633 } else if (err == DID_TRANSPORT_DISRUPTED)
634 state = ISCSI_TASK_ABRT_SESS_RECOV;
635 else
636 state = ISCSI_TASK_ABRT_TMF;
637
638 sc->result = err << 16;
639 if (!scsi_bidi_cmnd(sc))
640 scsi_set_resid(sc, scsi_bufflen(sc));
641 else {
642 scsi_out(sc)->resid = scsi_out(sc)->length;
643 scsi_in(sc)->resid = scsi_in(sc)->length;
644 }
645
646 iscsi_complete_task(task, state);
647}
648
649static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
650 struct iscsi_task *task)
651{
652 struct iscsi_session *session = conn->session;
653 struct iscsi_hdr *hdr = task->hdr;
654 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
655 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
656
657 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
658 return -ENOTCONN;
659
660 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
661 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
662 /*
663 * pre-format CmdSN for outgoing PDU.
664 */
665 nop->cmdsn = cpu_to_be32(session->cmdsn);
666 if (hdr->itt != RESERVED_ITT) {
667 /*
668 * TODO: We always use immediate for normal session pdus.
669 * If we start to send tmfs or nops as non-immediate then
670 * we should start checking the cmdsn numbers for mgmt tasks.
671 *
672 * During discovery sessions iscsid sends TEXT as non immediate,
673 * but we always only send one PDU at a time.
674 */
675 if (conn->c_stage == ISCSI_CONN_STARTED &&
676 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
677 session->queued_cmdsn++;
678 session->cmdsn++;
679 }
680 }
681
682 if (session->tt->init_task && session->tt->init_task(task))
683 return -EIO;
684
685 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
686 session->state = ISCSI_STATE_LOGGING_OUT;
687
688 task->state = ISCSI_TASK_RUNNING;
689 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
690 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
691 hdr->itt, task->data_count);
692 return 0;
693}
694
695static struct iscsi_task *
696__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
697 char *data, uint32_t data_size)
698{
699 struct iscsi_session *session = conn->session;
700 struct iscsi_host *ihost = shost_priv(session->host);
701 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
702 struct iscsi_task *task;
703 itt_t itt;
704
705 if (session->state == ISCSI_STATE_TERMINATE)
706 return NULL;
707
708 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
709 /*
710 * Login and Text are sent serially, in
711 * request-followed-by-response sequence.
712 * Same task can be used. Same ITT must be used.
713 * Note that login_task is preallocated at conn_create().
714 */
715 if (conn->login_task->state != ISCSI_TASK_FREE) {
716 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
717 "progress. Cannot start new task.\n");
718 return NULL;
719 }
720
721 task = conn->login_task;
722 } else {
723 if (session->state != ISCSI_STATE_LOGGED_IN)
724 return NULL;
725
726 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
727 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
728
729 if (!kfifo_out(&session->cmdpool.queue,
730 (void*)&task, sizeof(void*)))
731 return NULL;
732 }
733 /*
734 * released in complete pdu for task we expect a response for, and
735 * released by the lld when it has transmitted the task for
736 * pdus we do not expect a response for.
737 */
738 atomic_set(&task->refcount, 1);
739 task->conn = conn;
740 task->sc = NULL;
741 INIT_LIST_HEAD(&task->running);
742 task->state = ISCSI_TASK_PENDING;
743
744 if (data_size) {
745 memcpy(task->data, data, data_size);
746 task->data_count = data_size;
747 } else
748 task->data_count = 0;
749
750 if (conn->session->tt->alloc_pdu) {
751 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
752 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
753 "pdu for mgmt task.\n");
754 goto free_task;
755 }
756 }
757
758 itt = task->hdr->itt;
759 task->hdr_len = sizeof(struct iscsi_hdr);
760 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
761
762 if (hdr->itt != RESERVED_ITT) {
763 if (session->tt->parse_pdu_itt)
764 task->hdr->itt = itt;
765 else
766 task->hdr->itt = build_itt(task->itt,
767 task->conn->session->age);
768 }
769
770 if (!ihost->workq) {
771 if (iscsi_prep_mgmt_task(conn, task))
772 goto free_task;
773
774 if (session->tt->xmit_task(task))
775 goto free_task;
776 } else {
777 list_add_tail(&task->running, &conn->mgmtqueue);
778 iscsi_conn_queue_work(conn);
779 }
780
781 return task;
782
783free_task:
784 __iscsi_put_task(task);
785 return NULL;
786}
787
788int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
789 char *data, uint32_t data_size)
790{
791 struct iscsi_conn *conn = cls_conn->dd_data;
792 struct iscsi_session *session = conn->session;
793 int err = 0;
794
795 spin_lock_bh(&session->lock);
796 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
797 err = -EPERM;
798 spin_unlock_bh(&session->lock);
799 return err;
800}
801EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
802
803/**
804 * iscsi_cmd_rsp - SCSI Command Response processing
805 * @conn: iscsi connection
806 * @hdr: iscsi header
807 * @task: scsi command task
808 * @data: cmd data buffer
809 * @datalen: len of buffer
810 *
811 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
812 * then completes the command and task.
813 **/
814static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
815 struct iscsi_task *task, char *data,
816 int datalen)
817{
818 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
819 struct iscsi_session *session = conn->session;
820 struct scsi_cmnd *sc = task->sc;
821
822 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
823 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
824
825 sc->result = (DID_OK << 16) | rhdr->cmd_status;
826
827 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
828 sc->result = DID_ERROR << 16;
829 goto out;
830 }
831
832 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
833 uint16_t senselen;
834
835 if (datalen < 2) {
836invalid_datalen:
837 iscsi_conn_printk(KERN_ERR, conn,
838 "Got CHECK_CONDITION but invalid data "
839 "buffer size of %d\n", datalen);
840 sc->result = DID_BAD_TARGET << 16;
841 goto out;
842 }
843
844 senselen = get_unaligned_be16(data);
845 if (datalen < senselen)
846 goto invalid_datalen;
847
848 memcpy(sc->sense_buffer, data + 2,
849 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
850 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
851 min_t(uint16_t, senselen,
852 SCSI_SENSE_BUFFERSIZE));
853 }
854
855 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
856 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
857 int res_count = be32_to_cpu(rhdr->bi_residual_count);
858
859 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
860 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
861 res_count <= scsi_in(sc)->length))
862 scsi_in(sc)->resid = res_count;
863 else
864 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
865 }
866
867 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
868 ISCSI_FLAG_CMD_OVERFLOW)) {
869 int res_count = be32_to_cpu(rhdr->residual_count);
870
871 if (res_count > 0 &&
872 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
873 res_count <= scsi_bufflen(sc)))
874 /* write side for bidi or uni-io set_resid */
875 scsi_set_resid(sc, res_count);
876 else
877 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
878 }
879out:
880 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
881 sc, sc->result, task->itt);
882 conn->scsirsp_pdus_cnt++;
883 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
884}
885
886/**
887 * iscsi_data_in_rsp - SCSI Data-In Response processing
888 * @conn: iscsi connection
889 * @hdr: iscsi pdu
890 * @task: scsi command task
891 **/
892static void
893iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
894 struct iscsi_task *task)
895{
896 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
897 struct scsi_cmnd *sc = task->sc;
898
899 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
900 return;
901
902 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
903 sc->result = (DID_OK << 16) | rhdr->cmd_status;
904 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
905 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
906 ISCSI_FLAG_DATA_OVERFLOW)) {
907 int res_count = be32_to_cpu(rhdr->residual_count);
908
909 if (res_count > 0 &&
910 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
911 res_count <= scsi_in(sc)->length))
912 scsi_in(sc)->resid = res_count;
913 else
914 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
915 }
916
917 ISCSI_DBG_SESSION(conn->session, "data in with status done "
918 "[sc %p res %d itt 0x%x]\n",
919 sc, sc->result, task->itt);
920 conn->scsirsp_pdus_cnt++;
921 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
922}
923
924static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
925{
926 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
927
928 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
929 conn->tmfrsp_pdus_cnt++;
930
931 if (conn->tmf_state != TMF_QUEUED)
932 return;
933
934 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
935 conn->tmf_state = TMF_SUCCESS;
936 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
937 conn->tmf_state = TMF_NOT_FOUND;
938 else
939 conn->tmf_state = TMF_FAILED;
940 wake_up(&conn->ehwait);
941}
942
943static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
944{
945 struct iscsi_nopout hdr;
946 struct iscsi_task *task;
947
948 if (!rhdr && conn->ping_task)
949 return;
950
951 memset(&hdr, 0, sizeof(struct iscsi_nopout));
952 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
953 hdr.flags = ISCSI_FLAG_CMD_FINAL;
954
955 if (rhdr) {
956 hdr.lun = rhdr->lun;
957 hdr.ttt = rhdr->ttt;
958 hdr.itt = RESERVED_ITT;
959 } else
960 hdr.ttt = RESERVED_ITT;
961
962 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
963 if (!task)
964 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
965 else if (!rhdr) {
966 /* only track our nops */
967 conn->ping_task = task;
968 conn->last_ping = jiffies;
969 }
970}
971
972static int iscsi_nop_out_rsp(struct iscsi_task *task,
973 struct iscsi_nopin *nop, char *data, int datalen)
974{
975 struct iscsi_conn *conn = task->conn;
976 int rc = 0;
977
978 if (conn->ping_task != task) {
979 /*
980 * If this is not in response to one of our
981 * nops then it must be from userspace.
982 */
983 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
984 data, datalen))
985 rc = ISCSI_ERR_CONN_FAILED;
986 } else
987 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
988 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
989 return rc;
990}
991
992static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
993 char *data, int datalen)
994{
995 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
996 struct iscsi_hdr rejected_pdu;
997 int opcode, rc = 0;
998
999 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1000
1001 if (ntoh24(reject->dlength) > datalen ||
1002 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1003 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1004 "pdu. Invalid data length (pdu dlength "
1005 "%u, datalen %d\n", ntoh24(reject->dlength),
1006 datalen);
1007 return ISCSI_ERR_PROTO;
1008 }
1009 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1010 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1011
1012 switch (reject->reason) {
1013 case ISCSI_REASON_DATA_DIGEST_ERROR:
1014 iscsi_conn_printk(KERN_ERR, conn,
1015 "pdu (op 0x%x itt 0x%x) rejected "
1016 "due to DataDigest error.\n",
1017 rejected_pdu.itt, opcode);
1018 break;
1019 case ISCSI_REASON_IMM_CMD_REJECT:
1020 iscsi_conn_printk(KERN_ERR, conn,
1021 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1022 "immediate commands.\n",
1023 rejected_pdu.itt, opcode);
1024 /*
1025 * We only send one TMF at a time so if the target could not
1026 * handle it, then it should get fixed (RFC mandates that
1027 * a target can handle one immediate TMF per conn).
1028 *
1029 * For nops-outs, we could have sent more than one if
1030 * the target is sending us lots of nop-ins
1031 */
1032 if (opcode != ISCSI_OP_NOOP_OUT)
1033 return 0;
1034
1035 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1036 /*
1037 * nop-out in response to target's nop-out rejected.
1038 * Just resend.
1039 */
1040 iscsi_send_nopout(conn,
1041 (struct iscsi_nopin*)&rejected_pdu);
1042 else {
1043 struct iscsi_task *task;
1044 /*
1045 * Our nop as ping got dropped. We know the target
1046 * and transport are ok so just clean up
1047 */
1048 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1049 if (!task) {
1050 iscsi_conn_printk(KERN_ERR, conn,
1051 "Invalid pdu reject. Could "
1052 "not lookup rejected task.\n");
1053 rc = ISCSI_ERR_BAD_ITT;
1054 } else
1055 rc = iscsi_nop_out_rsp(task,
1056 (struct iscsi_nopin*)&rejected_pdu,
1057 NULL, 0);
1058 }
1059 break;
1060 default:
1061 iscsi_conn_printk(KERN_ERR, conn,
1062 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1063 "code 0x%x\n", rejected_pdu.itt,
1064 rejected_pdu.opcode, reject->reason);
1065 break;
1066 }
1067 return rc;
1068}
1069
1070/**
1071 * iscsi_itt_to_task - look up task by itt
1072 * @conn: iscsi connection
1073 * @itt: itt
1074 *
1075 * This should be used for mgmt tasks like login and nops, or if
1076 * the LDD's itt space does not include the session age.
1077 *
1078 * The session lock must be held.
1079 */
1080struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1081{
1082 struct iscsi_session *session = conn->session;
1083 int i;
1084
1085 if (itt == RESERVED_ITT)
1086 return NULL;
1087
1088 if (session->tt->parse_pdu_itt)
1089 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1090 else
1091 i = get_itt(itt);
1092 if (i >= session->cmds_max)
1093 return NULL;
1094
1095 return session->cmds[i];
1096}
1097EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1098
1099/**
1100 * __iscsi_complete_pdu - complete pdu
1101 * @conn: iscsi conn
1102 * @hdr: iscsi header
1103 * @data: data buffer
1104 * @datalen: len of data buffer
1105 *
1106 * Completes pdu processing by freeing any resources allocated at
1107 * queuecommand or send generic. session lock must be held and verify
1108 * itt must have been called.
1109 */
1110int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1111 char *data, int datalen)
1112{
1113 struct iscsi_session *session = conn->session;
1114 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1115 struct iscsi_task *task;
1116 uint32_t itt;
1117
1118 conn->last_recv = jiffies;
1119 rc = iscsi_verify_itt(conn, hdr->itt);
1120 if (rc)
1121 return rc;
1122
1123 if (hdr->itt != RESERVED_ITT)
1124 itt = get_itt(hdr->itt);
1125 else
1126 itt = ~0U;
1127
1128 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1129 opcode, conn->id, itt, datalen);
1130
1131 if (itt == ~0U) {
1132 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1133
1134 switch(opcode) {
1135 case ISCSI_OP_NOOP_IN:
1136 if (datalen) {
1137 rc = ISCSI_ERR_PROTO;
1138 break;
1139 }
1140
1141 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1142 break;
1143
1144 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1145 break;
1146 case ISCSI_OP_REJECT:
1147 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1148 break;
1149 case ISCSI_OP_ASYNC_EVENT:
1150 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1151 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1152 rc = ISCSI_ERR_CONN_FAILED;
1153 break;
1154 default:
1155 rc = ISCSI_ERR_BAD_OPCODE;
1156 break;
1157 }
1158 goto out;
1159 }
1160
1161 switch(opcode) {
1162 case ISCSI_OP_SCSI_CMD_RSP:
1163 case ISCSI_OP_SCSI_DATA_IN:
1164 task = iscsi_itt_to_ctask(conn, hdr->itt);
1165 if (!task)
1166 return ISCSI_ERR_BAD_ITT;
1167 task->last_xfer = jiffies;
1168 break;
1169 case ISCSI_OP_R2T:
1170 /*
1171 * LLD handles R2Ts if they need to.
1172 */
1173 return 0;
1174 case ISCSI_OP_LOGOUT_RSP:
1175 case ISCSI_OP_LOGIN_RSP:
1176 case ISCSI_OP_TEXT_RSP:
1177 case ISCSI_OP_SCSI_TMFUNC_RSP:
1178 case ISCSI_OP_NOOP_IN:
1179 task = iscsi_itt_to_task(conn, hdr->itt);
1180 if (!task)
1181 return ISCSI_ERR_BAD_ITT;
1182 break;
1183 default:
1184 return ISCSI_ERR_BAD_OPCODE;
1185 }
1186
1187 switch(opcode) {
1188 case ISCSI_OP_SCSI_CMD_RSP:
1189 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1190 break;
1191 case ISCSI_OP_SCSI_DATA_IN:
1192 iscsi_data_in_rsp(conn, hdr, task);
1193 break;
1194 case ISCSI_OP_LOGOUT_RSP:
1195 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1196 if (datalen) {
1197 rc = ISCSI_ERR_PROTO;
1198 break;
1199 }
1200 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1201 goto recv_pdu;
1202 case ISCSI_OP_LOGIN_RSP:
1203 case ISCSI_OP_TEXT_RSP:
1204 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1205 /*
1206 * login related PDU's exp_statsn is handled in
1207 * userspace
1208 */
1209 goto recv_pdu;
1210 case ISCSI_OP_SCSI_TMFUNC_RSP:
1211 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1212 if (datalen) {
1213 rc = ISCSI_ERR_PROTO;
1214 break;
1215 }
1216
1217 iscsi_tmf_rsp(conn, hdr);
1218 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1219 break;
1220 case ISCSI_OP_NOOP_IN:
1221 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1222 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1223 rc = ISCSI_ERR_PROTO;
1224 break;
1225 }
1226 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1227
1228 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1229 data, datalen);
1230 break;
1231 default:
1232 rc = ISCSI_ERR_BAD_OPCODE;
1233 break;
1234 }
1235
1236out:
1237 return rc;
1238recv_pdu:
1239 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1240 rc = ISCSI_ERR_CONN_FAILED;
1241 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1242 return rc;
1243}
1244EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1245
1246int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1247 char *data, int datalen)
1248{
1249 int rc;
1250
1251 spin_lock(&conn->session->lock);
1252 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1253 spin_unlock(&conn->session->lock);
1254 return rc;
1255}
1256EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1257
1258int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1259{
1260 struct iscsi_session *session = conn->session;
1261 int age = 0, i = 0;
1262
1263 if (itt == RESERVED_ITT)
1264 return 0;
1265
1266 if (session->tt->parse_pdu_itt)
1267 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1268 else {
1269 i = get_itt(itt);
1270 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1271 }
1272
1273 if (age != session->age) {
1274 iscsi_conn_printk(KERN_ERR, conn,
1275 "received itt %x expected session age (%x)\n",
1276 (__force u32)itt, session->age);
1277 return ISCSI_ERR_BAD_ITT;
1278 }
1279
1280 if (i >= session->cmds_max) {
1281 iscsi_conn_printk(KERN_ERR, conn,
1282 "received invalid itt index %u (max cmds "
1283 "%u.\n", i, session->cmds_max);
1284 return ISCSI_ERR_BAD_ITT;
1285 }
1286 return 0;
1287}
1288EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1289
1290/**
1291 * iscsi_itt_to_ctask - look up ctask by itt
1292 * @conn: iscsi connection
1293 * @itt: itt
1294 *
1295 * This should be used for cmd tasks.
1296 *
1297 * The session lock must be held.
1298 */
1299struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1300{
1301 struct iscsi_task *task;
1302
1303 if (iscsi_verify_itt(conn, itt))
1304 return NULL;
1305
1306 task = iscsi_itt_to_task(conn, itt);
1307 if (!task || !task->sc)
1308 return NULL;
1309
1310 if (task->sc->SCp.phase != conn->session->age) {
1311 iscsi_session_printk(KERN_ERR, conn->session,
1312 "task's session age %d, expected %d\n",
1313 task->sc->SCp.phase, conn->session->age);
1314 return NULL;
1315 }
1316
1317 return task;
1318}
1319EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1320
1321void iscsi_session_failure(struct iscsi_session *session,
1322 enum iscsi_err err)
1323{
1324 struct iscsi_conn *conn;
1325 struct device *dev;
1326
1327 spin_lock_bh(&session->lock);
1328 conn = session->leadconn;
1329 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1330 spin_unlock_bh(&session->lock);
1331 return;
1332 }
1333
1334 dev = get_device(&conn->cls_conn->dev);
1335 spin_unlock_bh(&session->lock);
1336 if (!dev)
1337 return;
1338 /*
1339 * if the host is being removed bypass the connection
1340 * recovery initialization because we are going to kill
1341 * the session.
1342 */
1343 if (err == ISCSI_ERR_INVALID_HOST)
1344 iscsi_conn_error_event(conn->cls_conn, err);
1345 else
1346 iscsi_conn_failure(conn, err);
1347 put_device(dev);
1348}
1349EXPORT_SYMBOL_GPL(iscsi_session_failure);
1350
1351void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1352{
1353 struct iscsi_session *session = conn->session;
1354
1355 spin_lock_bh(&session->lock);
1356 if (session->state == ISCSI_STATE_FAILED) {
1357 spin_unlock_bh(&session->lock);
1358 return;
1359 }
1360
1361 if (conn->stop_stage == 0)
1362 session->state = ISCSI_STATE_FAILED;
1363 spin_unlock_bh(&session->lock);
1364
1365 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1366 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1367 iscsi_conn_error_event(conn->cls_conn, err);
1368}
1369EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1370
1371static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1372{
1373 struct iscsi_session *session = conn->session;
1374
1375 /*
1376 * Check for iSCSI window and take care of CmdSN wrap-around
1377 */
1378 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1379 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1380 "%u MaxCmdSN %u CmdSN %u/%u\n",
1381 session->exp_cmdsn, session->max_cmdsn,
1382 session->cmdsn, session->queued_cmdsn);
1383 return -ENOSPC;
1384 }
1385 return 0;
1386}
1387
1388static int iscsi_xmit_task(struct iscsi_conn *conn)
1389{
1390 struct iscsi_task *task = conn->task;
1391 int rc;
1392
1393 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1394 return -ENODATA;
1395
1396 __iscsi_get_task(task);
1397 spin_unlock_bh(&conn->session->lock);
1398 rc = conn->session->tt->xmit_task(task);
1399 spin_lock_bh(&conn->session->lock);
1400 if (!rc) {
1401 /* done with this task */
1402 task->last_xfer = jiffies;
1403 conn->task = NULL;
1404 }
1405 __iscsi_put_task(task);
1406 return rc;
1407}
1408
1409/**
1410 * iscsi_requeue_task - requeue task to run from session workqueue
1411 * @task: task to requeue
1412 *
1413 * LLDs that need to run a task from the session workqueue should call
1414 * this. The session lock must be held. This should only be called
1415 * by software drivers.
1416 */
1417void iscsi_requeue_task(struct iscsi_task *task)
1418{
1419 struct iscsi_conn *conn = task->conn;
1420
1421 /*
1422 * this may be on the requeue list already if the xmit_task callout
1423 * is handling the r2ts while we are adding new ones
1424 */
1425 if (list_empty(&task->running))
1426 list_add_tail(&task->running, &conn->requeue);
1427 iscsi_conn_queue_work(conn);
1428}
1429EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1430
1431/**
1432 * iscsi_data_xmit - xmit any command into the scheduled connection
1433 * @conn: iscsi connection
1434 *
1435 * Notes:
1436 * The function can return -EAGAIN in which case the caller must
1437 * re-schedule it again later or recover. '0' return code means
1438 * successful xmit.
1439 **/
1440static int iscsi_data_xmit(struct iscsi_conn *conn)
1441{
1442 struct iscsi_task *task;
1443 int rc = 0;
1444
1445 spin_lock_bh(&conn->session->lock);
1446 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1447 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1448 spin_unlock_bh(&conn->session->lock);
1449 return -ENODATA;
1450 }
1451
1452 if (conn->task) {
1453 rc = iscsi_xmit_task(conn);
1454 if (rc)
1455 goto done;
1456 }
1457
1458 /*
1459 * process mgmt pdus like nops before commands since we should
1460 * only have one nop-out as a ping from us and targets should not
1461 * overflow us with nop-ins
1462 */
1463check_mgmt:
1464 while (!list_empty(&conn->mgmtqueue)) {
1465 conn->task = list_entry(conn->mgmtqueue.next,
1466 struct iscsi_task, running);
1467 list_del_init(&conn->task->running);
1468 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1469 __iscsi_put_task(conn->task);
1470 conn->task = NULL;
1471 continue;
1472 }
1473 rc = iscsi_xmit_task(conn);
1474 if (rc)
1475 goto done;
1476 }
1477
1478 /* process pending command queue */
1479 while (!list_empty(&conn->cmdqueue)) {
1480 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1481 running);
1482 list_del_init(&conn->task->running);
1483 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1484 fail_scsi_task(conn->task, DID_IMM_RETRY);
1485 continue;
1486 }
1487 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1488 if (rc) {
1489 if (rc == -ENOMEM || rc == -EACCES) {
1490 list_add_tail(&conn->task->running,
1491 &conn->cmdqueue);
1492 conn->task = NULL;
1493 goto done;
1494 } else
1495 fail_scsi_task(conn->task, DID_ABORT);
1496 continue;
1497 }
1498 rc = iscsi_xmit_task(conn);
1499 if (rc)
1500 goto done;
1501 /*
1502 * we could continuously get new task requests so
1503 * we need to check the mgmt queue for nops that need to
1504 * be sent to aviod starvation
1505 */
1506 if (!list_empty(&conn->mgmtqueue))
1507 goto check_mgmt;
1508 }
1509
1510 while (!list_empty(&conn->requeue)) {
1511 /*
1512 * we always do fastlogout - conn stop code will clean up.
1513 */
1514 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1515 break;
1516
1517 task = list_entry(conn->requeue.next, struct iscsi_task,
1518 running);
1519 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1520 break;
1521
1522 conn->task = task;
1523 list_del_init(&conn->task->running);
1524 conn->task->state = ISCSI_TASK_RUNNING;
1525 rc = iscsi_xmit_task(conn);
1526 if (rc)
1527 goto done;
1528 if (!list_empty(&conn->mgmtqueue))
1529 goto check_mgmt;
1530 }
1531 spin_unlock_bh(&conn->session->lock);
1532 return -ENODATA;
1533
1534done:
1535 spin_unlock_bh(&conn->session->lock);
1536 return rc;
1537}
1538
1539static void iscsi_xmitworker(struct work_struct *work)
1540{
1541 struct iscsi_conn *conn =
1542 container_of(work, struct iscsi_conn, xmitwork);
1543 int rc;
1544 /*
1545 * serialize Xmit worker on a per-connection basis.
1546 */
1547 do {
1548 rc = iscsi_data_xmit(conn);
1549 } while (rc >= 0 || rc == -EAGAIN);
1550}
1551
1552static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1553 struct scsi_cmnd *sc)
1554{
1555 struct iscsi_task *task;
1556
1557 if (!kfifo_out(&conn->session->cmdpool.queue,
1558 (void *) &task, sizeof(void *)))
1559 return NULL;
1560
1561 sc->SCp.phase = conn->session->age;
1562 sc->SCp.ptr = (char *) task;
1563
1564 atomic_set(&task->refcount, 1);
1565 task->state = ISCSI_TASK_PENDING;
1566 task->conn = conn;
1567 task->sc = sc;
1568 task->have_checked_conn = false;
1569 task->last_timeout = jiffies;
1570 task->last_xfer = jiffies;
1571 INIT_LIST_HEAD(&task->running);
1572 return task;
1573}
1574
1575enum {
1576 FAILURE_BAD_HOST = 1,
1577 FAILURE_SESSION_FAILED,
1578 FAILURE_SESSION_FREED,
1579 FAILURE_WINDOW_CLOSED,
1580 FAILURE_OOM,
1581 FAILURE_SESSION_TERMINATE,
1582 FAILURE_SESSION_IN_RECOVERY,
1583 FAILURE_SESSION_RECOVERY_TIMEOUT,
1584 FAILURE_SESSION_LOGGING_OUT,
1585 FAILURE_SESSION_NOT_READY,
1586};
1587
1588int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
1589{
1590 struct iscsi_cls_session *cls_session;
1591 struct iscsi_host *ihost;
1592 int reason = 0;
1593 struct iscsi_session *session;
1594 struct iscsi_conn *conn;
1595 struct iscsi_task *task = NULL;
1596
1597 sc->result = 0;
1598 sc->SCp.ptr = NULL;
1599
1600 ihost = shost_priv(host);
1601
1602 cls_session = starget_to_session(scsi_target(sc->device));
1603 session = cls_session->dd_data;
1604 spin_lock_bh(&session->lock);
1605
1606 reason = iscsi_session_chkready(cls_session);
1607 if (reason) {
1608 sc->result = reason;
1609 goto fault;
1610 }
1611
1612 if (session->state != ISCSI_STATE_LOGGED_IN) {
1613 /*
1614 * to handle the race between when we set the recovery state
1615 * and block the session we requeue here (commands could
1616 * be entering our queuecommand while a block is starting
1617 * up because the block code is not locked)
1618 */
1619 switch (session->state) {
1620 case ISCSI_STATE_FAILED:
1621 case ISCSI_STATE_IN_RECOVERY:
1622 reason = FAILURE_SESSION_IN_RECOVERY;
1623 sc->result = DID_IMM_RETRY << 16;
1624 break;
1625 case ISCSI_STATE_LOGGING_OUT:
1626 reason = FAILURE_SESSION_LOGGING_OUT;
1627 sc->result = DID_IMM_RETRY << 16;
1628 break;
1629 case ISCSI_STATE_RECOVERY_FAILED:
1630 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1631 sc->result = DID_TRANSPORT_FAILFAST << 16;
1632 break;
1633 case ISCSI_STATE_TERMINATE:
1634 reason = FAILURE_SESSION_TERMINATE;
1635 sc->result = DID_NO_CONNECT << 16;
1636 break;
1637 default:
1638 reason = FAILURE_SESSION_FREED;
1639 sc->result = DID_NO_CONNECT << 16;
1640 }
1641 goto fault;
1642 }
1643
1644 conn = session->leadconn;
1645 if (!conn) {
1646 reason = FAILURE_SESSION_FREED;
1647 sc->result = DID_NO_CONNECT << 16;
1648 goto fault;
1649 }
1650
1651 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1652 reason = FAILURE_SESSION_IN_RECOVERY;
1653 sc->result = DID_REQUEUE;
1654 goto fault;
1655 }
1656
1657 if (iscsi_check_cmdsn_window_closed(conn)) {
1658 reason = FAILURE_WINDOW_CLOSED;
1659 goto reject;
1660 }
1661
1662 task = iscsi_alloc_task(conn, sc);
1663 if (!task) {
1664 reason = FAILURE_OOM;
1665 goto reject;
1666 }
1667
1668 if (!ihost->workq) {
1669 reason = iscsi_prep_scsi_cmd_pdu(task);
1670 if (reason) {
1671 if (reason == -ENOMEM || reason == -EACCES) {
1672 reason = FAILURE_OOM;
1673 goto prepd_reject;
1674 } else {
1675 sc->result = DID_ABORT << 16;
1676 goto prepd_fault;
1677 }
1678 }
1679 if (session->tt->xmit_task(task)) {
1680 session->cmdsn--;
1681 reason = FAILURE_SESSION_NOT_READY;
1682 goto prepd_reject;
1683 }
1684 } else {
1685 list_add_tail(&task->running, &conn->cmdqueue);
1686 iscsi_conn_queue_work(conn);
1687 }
1688
1689 session->queued_cmdsn++;
1690 spin_unlock_bh(&session->lock);
1691 return 0;
1692
1693prepd_reject:
1694 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1695reject:
1696 spin_unlock_bh(&session->lock);
1697 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1698 sc->cmnd[0], reason);
1699 return SCSI_MLQUEUE_TARGET_BUSY;
1700
1701prepd_fault:
1702 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1703fault:
1704 spin_unlock_bh(&session->lock);
1705 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1706 sc->cmnd[0], reason);
1707 if (!scsi_bidi_cmnd(sc))
1708 scsi_set_resid(sc, scsi_bufflen(sc));
1709 else {
1710 scsi_out(sc)->resid = scsi_out(sc)->length;
1711 scsi_in(sc)->resid = scsi_in(sc)->length;
1712 }
1713 sc->scsi_done(sc);
1714 return 0;
1715}
1716EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1717
1718int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
1719{
1720 switch (reason) {
1721 case SCSI_QDEPTH_DEFAULT:
1722 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1723 break;
1724 case SCSI_QDEPTH_QFULL:
1725 scsi_track_queue_full(sdev, depth);
1726 break;
1727 case SCSI_QDEPTH_RAMP_UP:
1728 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1729 break;
1730 default:
1731 return -EOPNOTSUPP;
1732 }
1733 return sdev->queue_depth;
1734}
1735EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1736
1737int iscsi_target_alloc(struct scsi_target *starget)
1738{
1739 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1740 struct iscsi_session *session = cls_session->dd_data;
1741
1742 starget->can_queue = session->scsi_cmds_max;
1743 return 0;
1744}
1745EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1746
1747static void iscsi_tmf_timedout(unsigned long data)
1748{
1749 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1750 struct iscsi_session *session = conn->session;
1751
1752 spin_lock(&session->lock);
1753 if (conn->tmf_state == TMF_QUEUED) {
1754 conn->tmf_state = TMF_TIMEDOUT;
1755 ISCSI_DBG_EH(session, "tmf timedout\n");
1756 /* unblock eh_abort() */
1757 wake_up(&conn->ehwait);
1758 }
1759 spin_unlock(&session->lock);
1760}
1761
1762static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1763 struct iscsi_tm *hdr, int age,
1764 int timeout)
1765{
1766 struct iscsi_session *session = conn->session;
1767 struct iscsi_task *task;
1768
1769 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1770 NULL, 0);
1771 if (!task) {
1772 spin_unlock_bh(&session->lock);
1773 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1774 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1775 spin_lock_bh(&session->lock);
1776 return -EPERM;
1777 }
1778 conn->tmfcmd_pdus_cnt++;
1779 conn->tmf_timer.expires = timeout * HZ + jiffies;
1780 conn->tmf_timer.function = iscsi_tmf_timedout;
1781 conn->tmf_timer.data = (unsigned long)conn;
1782 add_timer(&conn->tmf_timer);
1783 ISCSI_DBG_EH(session, "tmf set timeout\n");
1784
1785 spin_unlock_bh(&session->lock);
1786 mutex_unlock(&session->eh_mutex);
1787
1788 /*
1789 * block eh thread until:
1790 *
1791 * 1) tmf response
1792 * 2) tmf timeout
1793 * 3) session is terminated or restarted or userspace has
1794 * given up on recovery
1795 */
1796 wait_event_interruptible(conn->ehwait, age != session->age ||
1797 session->state != ISCSI_STATE_LOGGED_IN ||
1798 conn->tmf_state != TMF_QUEUED);
1799 if (signal_pending(current))
1800 flush_signals(current);
1801 del_timer_sync(&conn->tmf_timer);
1802
1803 mutex_lock(&session->eh_mutex);
1804 spin_lock_bh(&session->lock);
1805 /* if the session drops it will clean up the task */
1806 if (age != session->age ||
1807 session->state != ISCSI_STATE_LOGGED_IN)
1808 return -ENOTCONN;
1809 return 0;
1810}
1811
1812/*
1813 * Fail commands. session lock held and recv side suspended and xmit
1814 * thread flushed
1815 */
1816static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1817 int error)
1818{
1819 struct iscsi_task *task;
1820 int i;
1821
1822 for (i = 0; i < conn->session->cmds_max; i++) {
1823 task = conn->session->cmds[i];
1824 if (!task->sc || task->state == ISCSI_TASK_FREE)
1825 continue;
1826
1827 if (lun != -1 && lun != task->sc->device->lun)
1828 continue;
1829
1830 ISCSI_DBG_SESSION(conn->session,
1831 "failing sc %p itt 0x%x state %d\n",
1832 task->sc, task->itt, task->state);
1833 fail_scsi_task(task, error);
1834 }
1835}
1836
1837/**
1838 * iscsi_suspend_queue - suspend iscsi_queuecommand
1839 * @conn: iscsi conn to stop queueing IO on
1840 *
1841 * This grabs the session lock to make sure no one is in
1842 * xmit_task/queuecommand, and then sets suspend to prevent
1843 * new commands from being queued. This only needs to be called
1844 * by offload drivers that need to sync a path like ep disconnect
1845 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1846 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1847 */
1848void iscsi_suspend_queue(struct iscsi_conn *conn)
1849{
1850 spin_lock_bh(&conn->session->lock);
1851 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1852 spin_unlock_bh(&conn->session->lock);
1853}
1854EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1855
1856/**
1857 * iscsi_suspend_tx - suspend iscsi_data_xmit
1858 * @conn: iscsi conn tp stop processing IO on.
1859 *
1860 * This function sets the suspend bit to prevent iscsi_data_xmit
1861 * from sending new IO, and if work is queued on the xmit thread
1862 * it will wait for it to be completed.
1863 */
1864void iscsi_suspend_tx(struct iscsi_conn *conn)
1865{
1866 struct Scsi_Host *shost = conn->session->host;
1867 struct iscsi_host *ihost = shost_priv(shost);
1868
1869 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1870 if (ihost->workq)
1871 flush_workqueue(ihost->workq);
1872}
1873EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1874
1875static void iscsi_start_tx(struct iscsi_conn *conn)
1876{
1877 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1878 iscsi_conn_queue_work(conn);
1879}
1880
1881/*
1882 * We want to make sure a ping is in flight. It has timed out.
1883 * And we are not busy processing a pdu that is making
1884 * progress but got started before the ping and is taking a while
1885 * to complete so the ping is just stuck behind it in a queue.
1886 */
1887static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1888{
1889 if (conn->ping_task &&
1890 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1891 (conn->ping_timeout * HZ), jiffies))
1892 return 1;
1893 else
1894 return 0;
1895}
1896
1897static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
1898{
1899 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1900 struct iscsi_task *task = NULL, *running_task;
1901 struct iscsi_cls_session *cls_session;
1902 struct iscsi_session *session;
1903 struct iscsi_conn *conn;
1904 int i;
1905
1906 cls_session = starget_to_session(scsi_target(sc->device));
1907 session = cls_session->dd_data;
1908
1909 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
1910
1911 spin_lock(&session->lock);
1912 task = (struct iscsi_task *)sc->SCp.ptr;
1913 if (!task) {
1914 /*
1915 * Raced with completion. Blk layer has taken ownership
1916 * so let timeout code complete it now.
1917 */
1918 rc = BLK_EH_HANDLED;
1919 goto done;
1920 }
1921
1922 if (session->state != ISCSI_STATE_LOGGED_IN) {
1923 /*
1924 * We are probably in the middle of iscsi recovery so let
1925 * that complete and handle the error.
1926 */
1927 rc = BLK_EH_RESET_TIMER;
1928 goto done;
1929 }
1930
1931 conn = session->leadconn;
1932 if (!conn) {
1933 /* In the middle of shuting down */
1934 rc = BLK_EH_RESET_TIMER;
1935 goto done;
1936 }
1937
1938 /*
1939 * If we have sent (at least queued to the network layer) a pdu or
1940 * recvd one for the task since the last timeout ask for
1941 * more time. If on the next timeout we have not made progress
1942 * we can check if it is the task or connection when we send the
1943 * nop as a ping.
1944 */
1945 if (time_after(task->last_xfer, task->last_timeout)) {
1946 ISCSI_DBG_EH(session, "Command making progress. Asking "
1947 "scsi-ml for more time to complete. "
1948 "Last data xfer at %lu. Last timeout was at "
1949 "%lu\n.", task->last_xfer, task->last_timeout);
1950 task->have_checked_conn = false;
1951 rc = BLK_EH_RESET_TIMER;
1952 goto done;
1953 }
1954
1955 if (!conn->recv_timeout && !conn->ping_timeout)
1956 goto done;
1957 /*
1958 * if the ping timedout then we are in the middle of cleaning up
1959 * and can let the iscsi eh handle it
1960 */
1961 if (iscsi_has_ping_timed_out(conn)) {
1962 rc = BLK_EH_RESET_TIMER;
1963 goto done;
1964 }
1965
1966 for (i = 0; i < conn->session->cmds_max; i++) {
1967 running_task = conn->session->cmds[i];
1968 if (!running_task->sc || running_task == task ||
1969 running_task->state != ISCSI_TASK_RUNNING)
1970 continue;
1971
1972 /*
1973 * Only check if cmds started before this one have made
1974 * progress, or this could never fail
1975 */
1976 if (time_after(running_task->sc->jiffies_at_alloc,
1977 task->sc->jiffies_at_alloc))
1978 continue;
1979
1980 if (time_after(running_task->last_xfer, task->last_timeout)) {
1981 /*
1982 * This task has not made progress, but a task
1983 * started before us has transferred data since
1984 * we started/last-checked. We could be queueing
1985 * too many tasks or the LU is bad.
1986 *
1987 * If the device is bad the cmds ahead of us on
1988 * other devs will complete, and this loop will
1989 * eventually fail starting the scsi eh.
1990 */
1991 ISCSI_DBG_EH(session, "Command has not made progress "
1992 "but commands ahead of it have. "
1993 "Asking scsi-ml for more time to "
1994 "complete. Our last xfer vs running task "
1995 "last xfer %lu/%lu. Last check %lu.\n",
1996 task->last_xfer, running_task->last_xfer,
1997 task->last_timeout);
1998 rc = BLK_EH_RESET_TIMER;
1999 goto done;
2000 }
2001 }
2002
2003 /* Assumes nop timeout is shorter than scsi cmd timeout */
2004 if (task->have_checked_conn)
2005 goto done;
2006
2007 /*
2008 * Checking the transport already or nop from a cmd timeout still
2009 * running
2010 */
2011 if (conn->ping_task) {
2012 task->have_checked_conn = true;
2013 rc = BLK_EH_RESET_TIMER;
2014 goto done;
2015 }
2016
2017 /* Make sure there is a transport check done */
2018 iscsi_send_nopout(conn, NULL);
2019 task->have_checked_conn = true;
2020 rc = BLK_EH_RESET_TIMER;
2021
2022done:
2023 if (task)
2024 task->last_timeout = jiffies;
2025 spin_unlock(&session->lock);
2026 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2027 "timer reset" : "nh");
2028 return rc;
2029}
2030
2031static void iscsi_check_transport_timeouts(unsigned long data)
2032{
2033 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2034 struct iscsi_session *session = conn->session;
2035 unsigned long recv_timeout, next_timeout = 0, last_recv;
2036
2037 spin_lock(&session->lock);
2038 if (session->state != ISCSI_STATE_LOGGED_IN)
2039 goto done;
2040
2041 recv_timeout = conn->recv_timeout;
2042 if (!recv_timeout)
2043 goto done;
2044
2045 recv_timeout *= HZ;
2046 last_recv = conn->last_recv;
2047
2048 if (iscsi_has_ping_timed_out(conn)) {
2049 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2050 "expired, recv timeout %d, last rx %lu, "
2051 "last ping %lu, now %lu\n",
2052 conn->ping_timeout, conn->recv_timeout,
2053 last_recv, conn->last_ping, jiffies);
2054 spin_unlock(&session->lock);
2055 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2056 return;
2057 }
2058
2059 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2060 /* send a ping to try to provoke some traffic */
2061 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2062 iscsi_send_nopout(conn, NULL);
2063 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2064 } else
2065 next_timeout = last_recv + recv_timeout;
2066
2067 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2068 mod_timer(&conn->transport_timer, next_timeout);
2069done:
2070 spin_unlock(&session->lock);
2071}
2072
2073static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2074 struct iscsi_tm *hdr)
2075{
2076 memset(hdr, 0, sizeof(*hdr));
2077 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2078 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2079 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2080 hdr->lun = task->lun;
2081 hdr->rtt = task->hdr_itt;
2082 hdr->refcmdsn = task->cmdsn;
2083}
2084
2085int iscsi_eh_abort(struct scsi_cmnd *sc)
2086{
2087 struct iscsi_cls_session *cls_session;
2088 struct iscsi_session *session;
2089 struct iscsi_conn *conn;
2090 struct iscsi_task *task;
2091 struct iscsi_tm *hdr;
2092 int rc, age;
2093
2094 cls_session = starget_to_session(scsi_target(sc->device));
2095 session = cls_session->dd_data;
2096
2097 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2098
2099 mutex_lock(&session->eh_mutex);
2100 spin_lock_bh(&session->lock);
2101 /*
2102 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2103 * got the command.
2104 */
2105 if (!sc->SCp.ptr) {
2106 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2107 "it completed.\n");
2108 spin_unlock_bh(&session->lock);
2109 mutex_unlock(&session->eh_mutex);
2110 return SUCCESS;
2111 }
2112
2113 /*
2114 * If we are not logged in or we have started a new session
2115 * then let the host reset code handle this
2116 */
2117 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2118 sc->SCp.phase != session->age) {
2119 spin_unlock_bh(&session->lock);
2120 mutex_unlock(&session->eh_mutex);
2121 ISCSI_DBG_EH(session, "failing abort due to dropped "
2122 "session.\n");
2123 return FAILED;
2124 }
2125
2126 conn = session->leadconn;
2127 conn->eh_abort_cnt++;
2128 age = session->age;
2129
2130 task = (struct iscsi_task *)sc->SCp.ptr;
2131 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2132 sc, task->itt);
2133
2134 /* task completed before time out */
2135 if (!task->sc) {
2136 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2137 goto success;
2138 }
2139
2140 if (task->state == ISCSI_TASK_PENDING) {
2141 fail_scsi_task(task, DID_ABORT);
2142 goto success;
2143 }
2144
2145 /* only have one tmf outstanding at a time */
2146 if (conn->tmf_state != TMF_INITIAL)
2147 goto failed;
2148 conn->tmf_state = TMF_QUEUED;
2149
2150 hdr = &conn->tmhdr;
2151 iscsi_prep_abort_task_pdu(task, hdr);
2152
2153 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
2154 rc = FAILED;
2155 goto failed;
2156 }
2157
2158 switch (conn->tmf_state) {
2159 case TMF_SUCCESS:
2160 spin_unlock_bh(&session->lock);
2161 /*
2162 * stop tx side incase the target had sent a abort rsp but
2163 * the initiator was still writing out data.
2164 */
2165 iscsi_suspend_tx(conn);
2166 /*
2167 * we do not stop the recv side because targets have been
2168 * good and have never sent us a successful tmf response
2169 * then sent more data for the cmd.
2170 */
2171 spin_lock_bh(&session->lock);
2172 fail_scsi_task(task, DID_ABORT);
2173 conn->tmf_state = TMF_INITIAL;
2174 memset(hdr, 0, sizeof(*hdr));
2175 spin_unlock_bh(&session->lock);
2176 iscsi_start_tx(conn);
2177 goto success_unlocked;
2178 case TMF_TIMEDOUT:
2179 spin_unlock_bh(&session->lock);
2180 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2181 goto failed_unlocked;
2182 case TMF_NOT_FOUND:
2183 if (!sc->SCp.ptr) {
2184 conn->tmf_state = TMF_INITIAL;
2185 memset(hdr, 0, sizeof(*hdr));
2186 /* task completed before tmf abort response */
2187 ISCSI_DBG_EH(session, "sc completed while abort in "
2188 "progress\n");
2189 goto success;
2190 }
2191 /* fall through */
2192 default:
2193 conn->tmf_state = TMF_INITIAL;
2194 goto failed;
2195 }
2196
2197success:
2198 spin_unlock_bh(&session->lock);
2199success_unlocked:
2200 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2201 sc, task->itt);
2202 mutex_unlock(&session->eh_mutex);
2203 return SUCCESS;
2204
2205failed:
2206 spin_unlock_bh(&session->lock);
2207failed_unlocked:
2208 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2209 task ? task->itt : 0);
2210 mutex_unlock(&session->eh_mutex);
2211 return FAILED;
2212}
2213EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2214
2215static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2216{
2217 memset(hdr, 0, sizeof(*hdr));
2218 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2219 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2220 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2221 int_to_scsilun(sc->device->lun, &hdr->lun);
2222 hdr->rtt = RESERVED_ITT;
2223}
2224
2225int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2226{
2227 struct iscsi_cls_session *cls_session;
2228 struct iscsi_session *session;
2229 struct iscsi_conn *conn;
2230 struct iscsi_tm *hdr;
2231 int rc = FAILED;
2232
2233 cls_session = starget_to_session(scsi_target(sc->device));
2234 session = cls_session->dd_data;
2235
2236 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
2237
2238 mutex_lock(&session->eh_mutex);
2239 spin_lock_bh(&session->lock);
2240 /*
2241 * Just check if we are not logged in. We cannot check for
2242 * the phase because the reset could come from a ioctl.
2243 */
2244 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2245 goto unlock;
2246 conn = session->leadconn;
2247
2248 /* only have one tmf outstanding at a time */
2249 if (conn->tmf_state != TMF_INITIAL)
2250 goto unlock;
2251 conn->tmf_state = TMF_QUEUED;
2252
2253 hdr = &conn->tmhdr;
2254 iscsi_prep_lun_reset_pdu(sc, hdr);
2255
2256 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2257 session->lu_reset_timeout)) {
2258 rc = FAILED;
2259 goto unlock;
2260 }
2261
2262 switch (conn->tmf_state) {
2263 case TMF_SUCCESS:
2264 break;
2265 case TMF_TIMEDOUT:
2266 spin_unlock_bh(&session->lock);
2267 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2268 goto done;
2269 default:
2270 conn->tmf_state = TMF_INITIAL;
2271 goto unlock;
2272 }
2273
2274 rc = SUCCESS;
2275 spin_unlock_bh(&session->lock);
2276
2277 iscsi_suspend_tx(conn);
2278
2279 spin_lock_bh(&session->lock);
2280 memset(hdr, 0, sizeof(*hdr));
2281 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2282 conn->tmf_state = TMF_INITIAL;
2283 spin_unlock_bh(&session->lock);
2284
2285 iscsi_start_tx(conn);
2286 goto done;
2287
2288unlock:
2289 spin_unlock_bh(&session->lock);
2290done:
2291 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2292 rc == SUCCESS ? "SUCCESS" : "FAILED");
2293 mutex_unlock(&session->eh_mutex);
2294 return rc;
2295}
2296EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2297
2298void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2299{
2300 struct iscsi_session *session = cls_session->dd_data;
2301
2302 spin_lock_bh(&session->lock);
2303 if (session->state != ISCSI_STATE_LOGGED_IN) {
2304 session->state = ISCSI_STATE_RECOVERY_FAILED;
2305 if (session->leadconn)
2306 wake_up(&session->leadconn->ehwait);
2307 }
2308 spin_unlock_bh(&session->lock);
2309}
2310EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2311
2312/**
2313 * iscsi_eh_session_reset - drop session and attempt relogin
2314 * @sc: scsi command
2315 *
2316 * This function will wait for a relogin, session termination from
2317 * userspace, or a recovery/replacement timeout.
2318 */
2319int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2320{
2321 struct iscsi_cls_session *cls_session;
2322 struct iscsi_session *session;
2323 struct iscsi_conn *conn;
2324
2325 cls_session = starget_to_session(scsi_target(sc->device));
2326 session = cls_session->dd_data;
2327 conn = session->leadconn;
2328
2329 mutex_lock(&session->eh_mutex);
2330 spin_lock_bh(&session->lock);
2331 if (session->state == ISCSI_STATE_TERMINATE) {
2332failed:
2333 ISCSI_DBG_EH(session,
2334 "failing session reset: Could not log back into "
2335 "%s, %s [age %d]\n", session->targetname,
2336 conn->persistent_address, session->age);
2337 spin_unlock_bh(&session->lock);
2338 mutex_unlock(&session->eh_mutex);
2339 return FAILED;
2340 }
2341
2342 spin_unlock_bh(&session->lock);
2343 mutex_unlock(&session->eh_mutex);
2344 /*
2345 * we drop the lock here but the leadconn cannot be destoyed while
2346 * we are in the scsi eh
2347 */
2348 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2349
2350 ISCSI_DBG_EH(session, "wait for relogin\n");
2351 wait_event_interruptible(conn->ehwait,
2352 session->state == ISCSI_STATE_TERMINATE ||
2353 session->state == ISCSI_STATE_LOGGED_IN ||
2354 session->state == ISCSI_STATE_RECOVERY_FAILED);
2355 if (signal_pending(current))
2356 flush_signals(current);
2357
2358 mutex_lock(&session->eh_mutex);
2359 spin_lock_bh(&session->lock);
2360 if (session->state == ISCSI_STATE_LOGGED_IN) {
2361 ISCSI_DBG_EH(session,
2362 "session reset succeeded for %s,%s\n",
2363 session->targetname, conn->persistent_address);
2364 } else
2365 goto failed;
2366 spin_unlock_bh(&session->lock);
2367 mutex_unlock(&session->eh_mutex);
2368 return SUCCESS;
2369}
2370EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2371
2372static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2373{
2374 memset(hdr, 0, sizeof(*hdr));
2375 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2376 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2377 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2378 hdr->rtt = RESERVED_ITT;
2379}
2380
2381/**
2382 * iscsi_eh_target_reset - reset target
2383 * @sc: scsi command
2384 *
2385 * This will attempt to send a warm target reset.
2386 */
2387int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2388{
2389 struct iscsi_cls_session *cls_session;
2390 struct iscsi_session *session;
2391 struct iscsi_conn *conn;
2392 struct iscsi_tm *hdr;
2393 int rc = FAILED;
2394
2395 cls_session = starget_to_session(scsi_target(sc->device));
2396 session = cls_session->dd_data;
2397
2398 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2399 session->targetname);
2400
2401 mutex_lock(&session->eh_mutex);
2402 spin_lock_bh(&session->lock);
2403 /*
2404 * Just check if we are not logged in. We cannot check for
2405 * the phase because the reset could come from a ioctl.
2406 */
2407 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2408 goto unlock;
2409 conn = session->leadconn;
2410
2411 /* only have one tmf outstanding at a time */
2412 if (conn->tmf_state != TMF_INITIAL)
2413 goto unlock;
2414 conn->tmf_state = TMF_QUEUED;
2415
2416 hdr = &conn->tmhdr;
2417 iscsi_prep_tgt_reset_pdu(sc, hdr);
2418
2419 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2420 session->tgt_reset_timeout)) {
2421 rc = FAILED;
2422 goto unlock;
2423 }
2424
2425 switch (conn->tmf_state) {
2426 case TMF_SUCCESS:
2427 break;
2428 case TMF_TIMEDOUT:
2429 spin_unlock_bh(&session->lock);
2430 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2431 goto done;
2432 default:
2433 conn->tmf_state = TMF_INITIAL;
2434 goto unlock;
2435 }
2436
2437 rc = SUCCESS;
2438 spin_unlock_bh(&session->lock);
2439
2440 iscsi_suspend_tx(conn);
2441
2442 spin_lock_bh(&session->lock);
2443 memset(hdr, 0, sizeof(*hdr));
2444 fail_scsi_tasks(conn, -1, DID_ERROR);
2445 conn->tmf_state = TMF_INITIAL;
2446 spin_unlock_bh(&session->lock);
2447
2448 iscsi_start_tx(conn);
2449 goto done;
2450
2451unlock:
2452 spin_unlock_bh(&session->lock);
2453done:
2454 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2455 rc == SUCCESS ? "SUCCESS" : "FAILED");
2456 mutex_unlock(&session->eh_mutex);
2457 return rc;
2458}
2459EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
2460
2461/**
2462 * iscsi_eh_recover_target - reset target and possibly the session
2463 * @sc: scsi command
2464 *
2465 * This will attempt to send a warm target reset. If that fails,
2466 * we will escalate to ERL0 session recovery.
2467 */
2468int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2469{
2470 int rc;
2471
2472 rc = iscsi_eh_target_reset(sc);
2473 if (rc == FAILED)
2474 rc = iscsi_eh_session_reset(sc);
2475 return rc;
2476}
2477EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2478
2479/*
2480 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2481 * should be accessed via kfifo_{get,put} on q->queue.
2482 * Optionally, the caller can obtain the array of object pointers
2483 * by passing in a non-NULL @items pointer
2484 */
2485int
2486iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2487{
2488 int i, num_arrays = 1;
2489
2490 memset(q, 0, sizeof(*q));
2491
2492 q->max = max;
2493
2494 /* If the user passed an items pointer, he wants a copy of
2495 * the array. */
2496 if (items)
2497 num_arrays++;
2498 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2499 if (q->pool == NULL)
2500 return -ENOMEM;
2501
2502 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2503
2504 for (i = 0; i < max; i++) {
2505 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2506 if (q->pool[i] == NULL) {
2507 q->max = i;
2508 goto enomem;
2509 }
2510 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2511 }
2512
2513 if (items) {
2514 *items = q->pool + max;
2515 memcpy(*items, q->pool, max * sizeof(void *));
2516 }
2517
2518 return 0;
2519
2520enomem:
2521 iscsi_pool_free(q);
2522 return -ENOMEM;
2523}
2524EXPORT_SYMBOL_GPL(iscsi_pool_init);
2525
2526void iscsi_pool_free(struct iscsi_pool *q)
2527{
2528 int i;
2529
2530 for (i = 0; i < q->max; i++)
2531 kfree(q->pool[i]);
2532 kfree(q->pool);
2533}
2534EXPORT_SYMBOL_GPL(iscsi_pool_free);
2535
2536/**
2537 * iscsi_host_add - add host to system
2538 * @shost: scsi host
2539 * @pdev: parent device
2540 *
2541 * This should be called by partial offload and software iscsi drivers
2542 * to add a host to the system.
2543 */
2544int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2545{
2546 if (!shost->can_queue)
2547 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2548
2549 if (!shost->cmd_per_lun)
2550 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2551
2552 if (!shost->transportt->eh_timed_out)
2553 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2554 return scsi_add_host(shost, pdev);
2555}
2556EXPORT_SYMBOL_GPL(iscsi_host_add);
2557
2558/**
2559 * iscsi_host_alloc - allocate a host and driver data
2560 * @sht: scsi host template
2561 * @dd_data_size: driver host data size
2562 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2563 *
2564 * This should be called by partial offload and software iscsi drivers.
2565 * To access the driver specific memory use the iscsi_host_priv() macro.
2566 */
2567struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2568 int dd_data_size, bool xmit_can_sleep)
2569{
2570 struct Scsi_Host *shost;
2571 struct iscsi_host *ihost;
2572
2573 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2574 if (!shost)
2575 return NULL;
2576 ihost = shost_priv(shost);
2577
2578 if (xmit_can_sleep) {
2579 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2580 "iscsi_q_%d", shost->host_no);
2581 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2582 if (!ihost->workq)
2583 goto free_host;
2584 }
2585
2586 spin_lock_init(&ihost->lock);
2587 ihost->state = ISCSI_HOST_SETUP;
2588 ihost->num_sessions = 0;
2589 init_waitqueue_head(&ihost->session_removal_wq);
2590 return shost;
2591
2592free_host:
2593 scsi_host_put(shost);
2594 return NULL;
2595}
2596EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2597
2598static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2599{
2600 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2601}
2602
2603/**
2604 * iscsi_host_remove - remove host and sessions
2605 * @shost: scsi host
2606 *
2607 * If there are any sessions left, this will initiate the removal and wait
2608 * for the completion.
2609 */
2610void iscsi_host_remove(struct Scsi_Host *shost)
2611{
2612 struct iscsi_host *ihost = shost_priv(shost);
2613 unsigned long flags;
2614
2615 spin_lock_irqsave(&ihost->lock, flags);
2616 ihost->state = ISCSI_HOST_REMOVED;
2617 spin_unlock_irqrestore(&ihost->lock, flags);
2618
2619 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2620 wait_event_interruptible(ihost->session_removal_wq,
2621 ihost->num_sessions == 0);
2622 if (signal_pending(current))
2623 flush_signals(current);
2624
2625 scsi_remove_host(shost);
2626 if (ihost->workq)
2627 destroy_workqueue(ihost->workq);
2628}
2629EXPORT_SYMBOL_GPL(iscsi_host_remove);
2630
2631void iscsi_host_free(struct Scsi_Host *shost)
2632{
2633 struct iscsi_host *ihost = shost_priv(shost);
2634
2635 kfree(ihost->netdev);
2636 kfree(ihost->hwaddress);
2637 kfree(ihost->initiatorname);
2638 scsi_host_put(shost);
2639}
2640EXPORT_SYMBOL_GPL(iscsi_host_free);
2641
2642static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2643{
2644 struct iscsi_host *ihost = shost_priv(shost);
2645 unsigned long flags;
2646
2647 shost = scsi_host_get(shost);
2648 if (!shost) {
2649 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2650 "of session teardown event because host already "
2651 "removed.\n");
2652 return;
2653 }
2654
2655 spin_lock_irqsave(&ihost->lock, flags);
2656 ihost->num_sessions--;
2657 if (ihost->num_sessions == 0)
2658 wake_up(&ihost->session_removal_wq);
2659 spin_unlock_irqrestore(&ihost->lock, flags);
2660 scsi_host_put(shost);
2661}
2662
2663/**
2664 * iscsi_session_setup - create iscsi cls session and host and session
2665 * @iscsit: iscsi transport template
2666 * @shost: scsi host
2667 * @cmds_max: session can queue
2668 * @cmd_task_size: LLD task private data size
2669 * @initial_cmdsn: initial CmdSN
2670 *
2671 * This can be used by software iscsi_transports that allocate
2672 * a session per scsi host.
2673 *
2674 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2675 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2676 * for nop handling and login/logout requests.
2677 */
2678struct iscsi_cls_session *
2679iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2680 uint16_t cmds_max, int dd_size, int cmd_task_size,
2681 uint32_t initial_cmdsn, unsigned int id)
2682{
2683 struct iscsi_host *ihost = shost_priv(shost);
2684 struct iscsi_session *session;
2685 struct iscsi_cls_session *cls_session;
2686 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2687 unsigned long flags;
2688
2689 spin_lock_irqsave(&ihost->lock, flags);
2690 if (ihost->state == ISCSI_HOST_REMOVED) {
2691 spin_unlock_irqrestore(&ihost->lock, flags);
2692 return NULL;
2693 }
2694 ihost->num_sessions++;
2695 spin_unlock_irqrestore(&ihost->lock, flags);
2696
2697 if (!total_cmds)
2698 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2699 /*
2700 * The iscsi layer needs some tasks for nop handling and tmfs,
2701 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2702 * + 1 command for scsi IO.
2703 */
2704 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2705 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2706 "must be a power of two that is at least %d.\n",
2707 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2708 goto dec_session_count;
2709 }
2710
2711 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2712 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2713 "must be a power of 2 less than or equal to %d.\n",
2714 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2715 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2716 }
2717
2718 if (!is_power_of_2(total_cmds)) {
2719 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2720 "must be a power of 2.\n", total_cmds);
2721 total_cmds = rounddown_pow_of_two(total_cmds);
2722 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2723 return NULL;
2724 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2725 total_cmds);
2726 }
2727 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2728
2729 cls_session = iscsi_alloc_session(shost, iscsit,
2730 sizeof(struct iscsi_session) +
2731 dd_size);
2732 if (!cls_session)
2733 goto dec_session_count;
2734 session = cls_session->dd_data;
2735 session->cls_session = cls_session;
2736 session->host = shost;
2737 session->state = ISCSI_STATE_FREE;
2738 session->fast_abort = 1;
2739 session->tgt_reset_timeout = 30;
2740 session->lu_reset_timeout = 15;
2741 session->abort_timeout = 10;
2742 session->scsi_cmds_max = scsi_cmds;
2743 session->cmds_max = total_cmds;
2744 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2745 session->exp_cmdsn = initial_cmdsn + 1;
2746 session->max_cmdsn = initial_cmdsn + 1;
2747 session->max_r2t = 1;
2748 session->tt = iscsit;
2749 session->dd_data = cls_session->dd_data + sizeof(*session);
2750 mutex_init(&session->eh_mutex);
2751 spin_lock_init(&session->lock);
2752
2753 /* initialize SCSI PDU commands pool */
2754 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2755 (void***)&session->cmds,
2756 cmd_task_size + sizeof(struct iscsi_task)))
2757 goto cmdpool_alloc_fail;
2758
2759 /* pre-format cmds pool with ITT */
2760 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2761 struct iscsi_task *task = session->cmds[cmd_i];
2762
2763 if (cmd_task_size)
2764 task->dd_data = &task[1];
2765 task->itt = cmd_i;
2766 task->state = ISCSI_TASK_FREE;
2767 INIT_LIST_HEAD(&task->running);
2768 }
2769
2770 if (!try_module_get(iscsit->owner))
2771 goto module_get_fail;
2772
2773 if (iscsi_add_session(cls_session, id))
2774 goto cls_session_fail;
2775
2776 return cls_session;
2777
2778cls_session_fail:
2779 module_put(iscsit->owner);
2780module_get_fail:
2781 iscsi_pool_free(&session->cmdpool);
2782cmdpool_alloc_fail:
2783 iscsi_free_session(cls_session);
2784dec_session_count:
2785 iscsi_host_dec_session_cnt(shost);
2786 return NULL;
2787}
2788EXPORT_SYMBOL_GPL(iscsi_session_setup);
2789
2790/**
2791 * iscsi_session_teardown - destroy session, host, and cls_session
2792 * @cls_session: iscsi session
2793 *
2794 * The driver must have called iscsi_remove_session before
2795 * calling this.
2796 */
2797void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2798{
2799 struct iscsi_session *session = cls_session->dd_data;
2800 struct module *owner = cls_session->transport->owner;
2801 struct Scsi_Host *shost = session->host;
2802
2803 iscsi_pool_free(&session->cmdpool);
2804
2805 kfree(session->password);
2806 kfree(session->password_in);
2807 kfree(session->username);
2808 kfree(session->username_in);
2809 kfree(session->targetname);
2810 kfree(session->targetalias);
2811 kfree(session->initiatorname);
2812 kfree(session->ifacename);
2813
2814 iscsi_destroy_session(cls_session);
2815 iscsi_host_dec_session_cnt(shost);
2816 module_put(owner);
2817}
2818EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2819
2820/**
2821 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2822 * @cls_session: iscsi_cls_session
2823 * @dd_size: private driver data size
2824 * @conn_idx: cid
2825 */
2826struct iscsi_cls_conn *
2827iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2828 uint32_t conn_idx)
2829{
2830 struct iscsi_session *session = cls_session->dd_data;
2831 struct iscsi_conn *conn;
2832 struct iscsi_cls_conn *cls_conn;
2833 char *data;
2834
2835 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2836 conn_idx);
2837 if (!cls_conn)
2838 return NULL;
2839 conn = cls_conn->dd_data;
2840 memset(conn, 0, sizeof(*conn) + dd_size);
2841
2842 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2843 conn->session = session;
2844 conn->cls_conn = cls_conn;
2845 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2846 conn->id = conn_idx;
2847 conn->exp_statsn = 0;
2848 conn->tmf_state = TMF_INITIAL;
2849
2850 init_timer(&conn->transport_timer);
2851 conn->transport_timer.data = (unsigned long)conn;
2852 conn->transport_timer.function = iscsi_check_transport_timeouts;
2853
2854 INIT_LIST_HEAD(&conn->mgmtqueue);
2855 INIT_LIST_HEAD(&conn->cmdqueue);
2856 INIT_LIST_HEAD(&conn->requeue);
2857 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2858
2859 /* allocate login_task used for the login/text sequences */
2860 spin_lock_bh(&session->lock);
2861 if (!kfifo_out(&session->cmdpool.queue,
2862 (void*)&conn->login_task,
2863 sizeof(void*))) {
2864 spin_unlock_bh(&session->lock);
2865 goto login_task_alloc_fail;
2866 }
2867 spin_unlock_bh(&session->lock);
2868
2869 data = (char *) __get_free_pages(GFP_KERNEL,
2870 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2871 if (!data)
2872 goto login_task_data_alloc_fail;
2873 conn->login_task->data = conn->data = data;
2874
2875 init_timer(&conn->tmf_timer);
2876 init_waitqueue_head(&conn->ehwait);
2877
2878 return cls_conn;
2879
2880login_task_data_alloc_fail:
2881 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2882 sizeof(void*));
2883login_task_alloc_fail:
2884 iscsi_destroy_conn(cls_conn);
2885 return NULL;
2886}
2887EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2888
2889/**
2890 * iscsi_conn_teardown - teardown iscsi connection
2891 * cls_conn: iscsi class connection
2892 *
2893 * TODO: we may need to make this into a two step process
2894 * like scsi-mls remove + put host
2895 */
2896void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2897{
2898 struct iscsi_conn *conn = cls_conn->dd_data;
2899 struct iscsi_session *session = conn->session;
2900 unsigned long flags;
2901
2902 del_timer_sync(&conn->transport_timer);
2903
2904 spin_lock_bh(&session->lock);
2905 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2906 if (session->leadconn == conn) {
2907 /*
2908 * leading connection? then give up on recovery.
2909 */
2910 session->state = ISCSI_STATE_TERMINATE;
2911 wake_up(&conn->ehwait);
2912 }
2913 spin_unlock_bh(&session->lock);
2914
2915 /*
2916 * Block until all in-progress commands for this connection
2917 * time out or fail.
2918 */
2919 for (;;) {
2920 spin_lock_irqsave(session->host->host_lock, flags);
2921 if (!session->host->host_busy) { /* OK for ERL == 0 */
2922 spin_unlock_irqrestore(session->host->host_lock, flags);
2923 break;
2924 }
2925 spin_unlock_irqrestore(session->host->host_lock, flags);
2926 msleep_interruptible(500);
2927 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2928 "host_busy %d host_failed %d\n",
2929 session->host->host_busy,
2930 session->host->host_failed);
2931 /*
2932 * force eh_abort() to unblock
2933 */
2934 wake_up(&conn->ehwait);
2935 }
2936
2937 /* flush queued up work because we free the connection below */
2938 iscsi_suspend_tx(conn);
2939
2940 spin_lock_bh(&session->lock);
2941 free_pages((unsigned long) conn->data,
2942 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2943 kfree(conn->persistent_address);
2944 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
2945 sizeof(void*));
2946 if (session->leadconn == conn)
2947 session->leadconn = NULL;
2948 spin_unlock_bh(&session->lock);
2949
2950 iscsi_destroy_conn(cls_conn);
2951}
2952EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2953
2954int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2955{
2956 struct iscsi_conn *conn = cls_conn->dd_data;
2957 struct iscsi_session *session = conn->session;
2958
2959 if (!session) {
2960 iscsi_conn_printk(KERN_ERR, conn,
2961 "can't start unbound connection\n");
2962 return -EPERM;
2963 }
2964
2965 if ((session->imm_data_en || !session->initial_r2t_en) &&
2966 session->first_burst > session->max_burst) {
2967 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2968 "first_burst %d max_burst %d\n",
2969 session->first_burst, session->max_burst);
2970 return -EINVAL;
2971 }
2972
2973 if (conn->ping_timeout && !conn->recv_timeout) {
2974 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2975 "zero. Using 5 seconds\n.");
2976 conn->recv_timeout = 5;
2977 }
2978
2979 if (conn->recv_timeout && !conn->ping_timeout) {
2980 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2981 "zero. Using 5 seconds.\n");
2982 conn->ping_timeout = 5;
2983 }
2984
2985 spin_lock_bh(&session->lock);
2986 conn->c_stage = ISCSI_CONN_STARTED;
2987 session->state = ISCSI_STATE_LOGGED_IN;
2988 session->queued_cmdsn = session->cmdsn;
2989
2990 conn->last_recv = jiffies;
2991 conn->last_ping = jiffies;
2992 if (conn->recv_timeout && conn->ping_timeout)
2993 mod_timer(&conn->transport_timer,
2994 jiffies + (conn->recv_timeout * HZ));
2995
2996 switch(conn->stop_stage) {
2997 case STOP_CONN_RECOVER:
2998 /*
2999 * unblock eh_abort() if it is blocked. re-try all
3000 * commands after successful recovery
3001 */
3002 conn->stop_stage = 0;
3003 conn->tmf_state = TMF_INITIAL;
3004 session->age++;
3005 if (session->age == 16)
3006 session->age = 0;
3007 break;
3008 case STOP_CONN_TERM:
3009 conn->stop_stage = 0;
3010 break;
3011 default:
3012 break;
3013 }
3014 spin_unlock_bh(&session->lock);
3015
3016 iscsi_unblock_session(session->cls_session);
3017 wake_up(&conn->ehwait);
3018 return 0;
3019}
3020EXPORT_SYMBOL_GPL(iscsi_conn_start);
3021
3022static void
3023fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3024{
3025 struct iscsi_task *task;
3026 int i, state;
3027
3028 for (i = 0; i < conn->session->cmds_max; i++) {
3029 task = conn->session->cmds[i];
3030 if (task->sc)
3031 continue;
3032
3033 if (task->state == ISCSI_TASK_FREE)
3034 continue;
3035
3036 ISCSI_DBG_SESSION(conn->session,
3037 "failing mgmt itt 0x%x state %d\n",
3038 task->itt, task->state);
3039 state = ISCSI_TASK_ABRT_SESS_RECOV;
3040 if (task->state == ISCSI_TASK_PENDING)
3041 state = ISCSI_TASK_COMPLETED;
3042 iscsi_complete_task(task, state);
3043
3044 }
3045}
3046
3047static void iscsi_start_session_recovery(struct iscsi_session *session,
3048 struct iscsi_conn *conn, int flag)
3049{
3050 int old_stop_stage;
3051
3052 mutex_lock(&session->eh_mutex);
3053 spin_lock_bh(&session->lock);
3054 if (conn->stop_stage == STOP_CONN_TERM) {
3055 spin_unlock_bh(&session->lock);
3056 mutex_unlock(&session->eh_mutex);
3057 return;
3058 }
3059
3060 /*
3061 * When this is called for the in_login state, we only want to clean
3062 * up the login task and connection. We do not need to block and set
3063 * the recovery state again
3064 */
3065 if (flag == STOP_CONN_TERM)
3066 session->state = ISCSI_STATE_TERMINATE;
3067 else if (conn->stop_stage != STOP_CONN_RECOVER)
3068 session->state = ISCSI_STATE_IN_RECOVERY;
3069
3070 old_stop_stage = conn->stop_stage;
3071 conn->stop_stage = flag;
3072 spin_unlock_bh(&session->lock);
3073
3074 del_timer_sync(&conn->transport_timer);
3075 iscsi_suspend_tx(conn);
3076
3077 spin_lock_bh(&session->lock);
3078 conn->c_stage = ISCSI_CONN_STOPPED;
3079 spin_unlock_bh(&session->lock);
3080
3081 /*
3082 * for connection level recovery we should not calculate
3083 * header digest. conn->hdr_size used for optimization
3084 * in hdr_extract() and will be re-negotiated at
3085 * set_param() time.
3086 */
3087 if (flag == STOP_CONN_RECOVER) {
3088 conn->hdrdgst_en = 0;
3089 conn->datadgst_en = 0;
3090 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3091 old_stop_stage != STOP_CONN_RECOVER) {
3092 ISCSI_DBG_SESSION(session, "blocking session\n");
3093 iscsi_block_session(session->cls_session);
3094 }
3095 }
3096
3097 /*
3098 * flush queues.
3099 */
3100 spin_lock_bh(&session->lock);
3101 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3102 fail_mgmt_tasks(session, conn);
3103 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
3104 spin_unlock_bh(&session->lock);
3105 mutex_unlock(&session->eh_mutex);
3106}
3107
3108void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3109{
3110 struct iscsi_conn *conn = cls_conn->dd_data;
3111 struct iscsi_session *session = conn->session;
3112
3113 switch (flag) {
3114 case STOP_CONN_RECOVER:
3115 case STOP_CONN_TERM:
3116 iscsi_start_session_recovery(session, conn, flag);
3117 break;
3118 default:
3119 iscsi_conn_printk(KERN_ERR, conn,
3120 "invalid stop flag %d\n", flag);
3121 }
3122}
3123EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3124
3125int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3126 struct iscsi_cls_conn *cls_conn, int is_leading)
3127{
3128 struct iscsi_session *session = cls_session->dd_data;
3129 struct iscsi_conn *conn = cls_conn->dd_data;
3130
3131 spin_lock_bh(&session->lock);
3132 if (is_leading)
3133 session->leadconn = conn;
3134 spin_unlock_bh(&session->lock);
3135
3136 /*
3137 * Unblock xmitworker(), Login Phase will pass through.
3138 */
3139 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3140 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3141 return 0;
3142}
3143EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3144
3145static int iscsi_switch_str_param(char **param, char *new_val_buf)
3146{
3147 char *new_val;
3148
3149 if (*param) {
3150 if (!strcmp(*param, new_val_buf))
3151 return 0;
3152 }
3153
3154 new_val = kstrdup(new_val_buf, GFP_NOIO);
3155 if (!new_val)
3156 return -ENOMEM;
3157
3158 kfree(*param);
3159 *param = new_val;
3160 return 0;
3161}
3162
3163int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3164 enum iscsi_param param, char *buf, int buflen)
3165{
3166 struct iscsi_conn *conn = cls_conn->dd_data;
3167 struct iscsi_session *session = conn->session;
3168
3169 switch(param) {
3170 case ISCSI_PARAM_FAST_ABORT:
3171 sscanf(buf, "%d", &session->fast_abort);
3172 break;
3173 case ISCSI_PARAM_ABORT_TMO:
3174 sscanf(buf, "%d", &session->abort_timeout);
3175 break;
3176 case ISCSI_PARAM_LU_RESET_TMO:
3177 sscanf(buf, "%d", &session->lu_reset_timeout);
3178 break;
3179 case ISCSI_PARAM_TGT_RESET_TMO:
3180 sscanf(buf, "%d", &session->tgt_reset_timeout);
3181 break;
3182 case ISCSI_PARAM_PING_TMO:
3183 sscanf(buf, "%d", &conn->ping_timeout);
3184 break;
3185 case ISCSI_PARAM_RECV_TMO:
3186 sscanf(buf, "%d", &conn->recv_timeout);
3187 break;
3188 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3189 sscanf(buf, "%d", &conn->max_recv_dlength);
3190 break;
3191 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3192 sscanf(buf, "%d", &conn->max_xmit_dlength);
3193 break;
3194 case ISCSI_PARAM_HDRDGST_EN:
3195 sscanf(buf, "%d", &conn->hdrdgst_en);
3196 break;
3197 case ISCSI_PARAM_DATADGST_EN:
3198 sscanf(buf, "%d", &conn->datadgst_en);
3199 break;
3200 case ISCSI_PARAM_INITIAL_R2T_EN:
3201 sscanf(buf, "%d", &session->initial_r2t_en);
3202 break;
3203 case ISCSI_PARAM_MAX_R2T:
3204 sscanf(buf, "%hu", &session->max_r2t);
3205 break;
3206 case ISCSI_PARAM_IMM_DATA_EN:
3207 sscanf(buf, "%d", &session->imm_data_en);
3208 break;
3209 case ISCSI_PARAM_FIRST_BURST:
3210 sscanf(buf, "%d", &session->first_burst);
3211 break;
3212 case ISCSI_PARAM_MAX_BURST:
3213 sscanf(buf, "%d", &session->max_burst);
3214 break;
3215 case ISCSI_PARAM_PDU_INORDER_EN:
3216 sscanf(buf, "%d", &session->pdu_inorder_en);
3217 break;
3218 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3219 sscanf(buf, "%d", &session->dataseq_inorder_en);
3220 break;
3221 case ISCSI_PARAM_ERL:
3222 sscanf(buf, "%d", &session->erl);
3223 break;
3224 case ISCSI_PARAM_EXP_STATSN:
3225 sscanf(buf, "%u", &conn->exp_statsn);
3226 break;
3227 case ISCSI_PARAM_USERNAME:
3228 return iscsi_switch_str_param(&session->username, buf);
3229 case ISCSI_PARAM_USERNAME_IN:
3230 return iscsi_switch_str_param(&session->username_in, buf);
3231 case ISCSI_PARAM_PASSWORD:
3232 return iscsi_switch_str_param(&session->password, buf);
3233 case ISCSI_PARAM_PASSWORD_IN:
3234 return iscsi_switch_str_param(&session->password_in, buf);
3235 case ISCSI_PARAM_TARGET_NAME:
3236 return iscsi_switch_str_param(&session->targetname, buf);
3237 case ISCSI_PARAM_TARGET_ALIAS:
3238 return iscsi_switch_str_param(&session->targetalias, buf);
3239 case ISCSI_PARAM_TPGT:
3240 sscanf(buf, "%d", &session->tpgt);
3241 break;
3242 case ISCSI_PARAM_PERSISTENT_PORT:
3243 sscanf(buf, "%d", &conn->persistent_port);
3244 break;
3245 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3246 return iscsi_switch_str_param(&conn->persistent_address, buf);
3247 case ISCSI_PARAM_IFACE_NAME:
3248 return iscsi_switch_str_param(&session->ifacename, buf);
3249 case ISCSI_PARAM_INITIATOR_NAME:
3250 return iscsi_switch_str_param(&session->initiatorname, buf);
3251 default:
3252 return -ENOSYS;
3253 }
3254
3255 return 0;
3256}
3257EXPORT_SYMBOL_GPL(iscsi_set_param);
3258
3259int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3260 enum iscsi_param param, char *buf)
3261{
3262 struct iscsi_session *session = cls_session->dd_data;
3263 int len;
3264
3265 switch(param) {
3266 case ISCSI_PARAM_FAST_ABORT:
3267 len = sprintf(buf, "%d\n", session->fast_abort);
3268 break;
3269 case ISCSI_PARAM_ABORT_TMO:
3270 len = sprintf(buf, "%d\n", session->abort_timeout);
3271 break;
3272 case ISCSI_PARAM_LU_RESET_TMO:
3273 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3274 break;
3275 case ISCSI_PARAM_TGT_RESET_TMO:
3276 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3277 break;
3278 case ISCSI_PARAM_INITIAL_R2T_EN:
3279 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3280 break;
3281 case ISCSI_PARAM_MAX_R2T:
3282 len = sprintf(buf, "%hu\n", session->max_r2t);
3283 break;
3284 case ISCSI_PARAM_IMM_DATA_EN:
3285 len = sprintf(buf, "%d\n", session->imm_data_en);
3286 break;
3287 case ISCSI_PARAM_FIRST_BURST:
3288 len = sprintf(buf, "%u\n", session->first_burst);
3289 break;
3290 case ISCSI_PARAM_MAX_BURST:
3291 len = sprintf(buf, "%u\n", session->max_burst);
3292 break;
3293 case ISCSI_PARAM_PDU_INORDER_EN:
3294 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3295 break;
3296 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3297 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3298 break;
3299 case ISCSI_PARAM_ERL:
3300 len = sprintf(buf, "%d\n", session->erl);
3301 break;
3302 case ISCSI_PARAM_TARGET_NAME:
3303 len = sprintf(buf, "%s\n", session->targetname);
3304 break;
3305 case ISCSI_PARAM_TARGET_ALIAS:
3306 len = sprintf(buf, "%s\n", session->targetalias);
3307 break;
3308 case ISCSI_PARAM_TPGT:
3309 len = sprintf(buf, "%d\n", session->tpgt);
3310 break;
3311 case ISCSI_PARAM_USERNAME:
3312 len = sprintf(buf, "%s\n", session->username);
3313 break;
3314 case ISCSI_PARAM_USERNAME_IN:
3315 len = sprintf(buf, "%s\n", session->username_in);
3316 break;
3317 case ISCSI_PARAM_PASSWORD:
3318 len = sprintf(buf, "%s\n", session->password);
3319 break;
3320 case ISCSI_PARAM_PASSWORD_IN:
3321 len = sprintf(buf, "%s\n", session->password_in);
3322 break;
3323 case ISCSI_PARAM_IFACE_NAME:
3324 len = sprintf(buf, "%s\n", session->ifacename);
3325 break;
3326 case ISCSI_PARAM_INITIATOR_NAME:
3327 len = sprintf(buf, "%s\n", session->initiatorname);
3328 break;
3329 default:
3330 return -ENOSYS;
3331 }
3332
3333 return len;
3334}
3335EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3336
3337int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3338 enum iscsi_param param, char *buf)
3339{
3340 struct sockaddr_in6 *sin6 = NULL;
3341 struct sockaddr_in *sin = NULL;
3342 int len;
3343
3344 switch (addr->ss_family) {
3345 case AF_INET:
3346 sin = (struct sockaddr_in *)addr;
3347 break;
3348 case AF_INET6:
3349 sin6 = (struct sockaddr_in6 *)addr;
3350 break;
3351 default:
3352 return -EINVAL;
3353 }
3354
3355 switch (param) {
3356 case ISCSI_PARAM_CONN_ADDRESS:
3357 case ISCSI_HOST_PARAM_IPADDRESS:
3358 if (sin)
3359 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3360 else
3361 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3362 break;
3363 case ISCSI_PARAM_CONN_PORT:
3364 if (sin)
3365 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3366 else
3367 len = sprintf(buf, "%hu\n",
3368 be16_to_cpu(sin6->sin6_port));
3369 break;
3370 default:
3371 return -EINVAL;
3372 }
3373
3374 return len;
3375}
3376EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3377
3378int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3379 enum iscsi_param param, char *buf)
3380{
3381 struct iscsi_conn *conn = cls_conn->dd_data;
3382 int len;
3383
3384 switch(param) {
3385 case ISCSI_PARAM_PING_TMO:
3386 len = sprintf(buf, "%u\n", conn->ping_timeout);
3387 break;
3388 case ISCSI_PARAM_RECV_TMO:
3389 len = sprintf(buf, "%u\n", conn->recv_timeout);
3390 break;
3391 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3392 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3393 break;
3394 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3395 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3396 break;
3397 case ISCSI_PARAM_HDRDGST_EN:
3398 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3399 break;
3400 case ISCSI_PARAM_DATADGST_EN:
3401 len = sprintf(buf, "%d\n", conn->datadgst_en);
3402 break;
3403 case ISCSI_PARAM_IFMARKER_EN:
3404 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3405 break;
3406 case ISCSI_PARAM_OFMARKER_EN:
3407 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3408 break;
3409 case ISCSI_PARAM_EXP_STATSN:
3410 len = sprintf(buf, "%u\n", conn->exp_statsn);
3411 break;
3412 case ISCSI_PARAM_PERSISTENT_PORT:
3413 len = sprintf(buf, "%d\n", conn->persistent_port);
3414 break;
3415 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3416 len = sprintf(buf, "%s\n", conn->persistent_address);
3417 break;
3418 default:
3419 return -ENOSYS;
3420 }
3421
3422 return len;
3423}
3424EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3425
3426int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3427 char *buf)
3428{
3429 struct iscsi_host *ihost = shost_priv(shost);
3430 int len;
3431
3432 switch (param) {
3433 case ISCSI_HOST_PARAM_NETDEV_NAME:
3434 len = sprintf(buf, "%s\n", ihost->netdev);
3435 break;
3436 case ISCSI_HOST_PARAM_HWADDRESS:
3437 len = sprintf(buf, "%s\n", ihost->hwaddress);
3438 break;
3439 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3440 len = sprintf(buf, "%s\n", ihost->initiatorname);
3441 break;
3442 default:
3443 return -ENOSYS;
3444 }
3445
3446 return len;
3447}
3448EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3449
3450int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3451 char *buf, int buflen)
3452{
3453 struct iscsi_host *ihost = shost_priv(shost);
3454
3455 switch (param) {
3456 case ISCSI_HOST_PARAM_NETDEV_NAME:
3457 return iscsi_switch_str_param(&ihost->netdev, buf);
3458 case ISCSI_HOST_PARAM_HWADDRESS:
3459 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3460 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3461 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3462 default:
3463 return -ENOSYS;
3464 }
3465
3466 return 0;
3467}
3468EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3469
3470MODULE_AUTHOR("Mike Christie");
3471MODULE_DESCRIPTION("iSCSI library functions");
3472MODULE_LICENSE("GPL");