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