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[SCSI] libiscsi: fix iscsi pool error path
[linux-2.6/verdex.git] / drivers / scsi / libiscsi.c
blob689628359169667d96af80b2d29a71fc079b8a04
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 <asm/unaligned.h>
29 #include <net/tcp.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
40
41 static int iscsi_dbg_lib;
42 module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR);
43 MODULE_PARM_DESC(debug_libiscsi, "Turn on debugging for libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default "
45 "is off.");
46
47 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
48 do { \
49 if (iscsi_dbg_lib) \
50 iscsi_conn_printk(KERN_INFO, _conn, \
51 "%s " dbg_fmt, \
52 __func__, ##arg); \
53 } while (0);
54
55 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
56 do { \
57 if (iscsi_dbg_lib) \
58 iscsi_session_printk(KERN_INFO, _session, \
59 "%s " dbg_fmt, \
60 __func__, ##arg); \
61 } while (0);
62
63 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
64 #define SNA32_CHECK 2147483648UL
65
66 static int iscsi_sna_lt(u32 n1, u32 n2)
67 {
68 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
69 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
70 }
71
72 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
73 static int iscsi_sna_lte(u32 n1, u32 n2)
74 {
75 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
76 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
77 }
78
79 inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
80 {
81 struct Scsi_Host *shost = conn->session->host;
82 struct iscsi_host *ihost = shost_priv(shost);
83
84 queue_work(ihost->workq, &conn->xmitwork);
85 }
86 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
87
88 void
89 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
90 {
91 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
92 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
93
94 /*
95 * standard specifies this check for when to update expected and
96 * max sequence numbers
97 */
98 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
99 return;
100
101 if (exp_cmdsn != session->exp_cmdsn &&
102 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
103 session->exp_cmdsn = exp_cmdsn;
104
105 if (max_cmdsn != session->max_cmdsn &&
106 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
107 session->max_cmdsn = max_cmdsn;
108 /*
109 * if the window closed with IO queued, then kick the
110 * xmit thread
111 */
112 if (!list_empty(&session->leadconn->xmitqueue) ||
113 !list_empty(&session->leadconn->mgmtqueue)) {
114 if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD))
115 iscsi_conn_queue_work(session->leadconn);
116 }
117 }
118 }
119 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
120
121 /**
122 * iscsi_prep_data_out_pdu - initialize Data-Out
123 * @task: scsi command task
124 * @r2t: R2T info
125 * @hdr: iscsi data in pdu
126 *
127 * Notes:
128 * Initialize Data-Out within this R2T sequence and finds
129 * proper data_offset within this SCSI command.
130 *
131 * This function is called with connection lock taken.
132 **/
133 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
134 struct iscsi_data *hdr)
135 {
136 struct iscsi_conn *conn = task->conn;
137 unsigned int left = r2t->data_length - r2t->sent;
138
139 task->hdr_len = sizeof(struct iscsi_data);
140
141 memset(hdr, 0, sizeof(struct iscsi_data));
142 hdr->ttt = r2t->ttt;
143 hdr->datasn = cpu_to_be32(r2t->datasn);
144 r2t->datasn++;
145 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
146 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
147 hdr->itt = task->hdr_itt;
148 hdr->exp_statsn = r2t->exp_statsn;
149 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
150 if (left > conn->max_xmit_dlength) {
151 hton24(hdr->dlength, conn->max_xmit_dlength);
152 r2t->data_count = conn->max_xmit_dlength;
153 hdr->flags = 0;
154 } else {
155 hton24(hdr->dlength, left);
156 r2t->data_count = left;
157 hdr->flags = ISCSI_FLAG_CMD_FINAL;
158 }
159 conn->dataout_pdus_cnt++;
160 }
161 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
162
163 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
164 {
165 unsigned exp_len = task->hdr_len + len;
166
167 if (exp_len > task->hdr_max) {
168 WARN_ON(1);
169 return -EINVAL;
170 }
171
172 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
173 task->hdr_len = exp_len;
174 return 0;
175 }
176
177 /*
178 * make an extended cdb AHS
179 */
180 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
181 {
182 struct scsi_cmnd *cmd = task->sc;
183 unsigned rlen, pad_len;
184 unsigned short ahslength;
185 struct iscsi_ecdb_ahdr *ecdb_ahdr;
186 int rc;
187
188 ecdb_ahdr = iscsi_next_hdr(task);
189 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
190
191 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
192 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
193
194 pad_len = iscsi_padding(rlen);
195
196 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
197 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
198 if (rc)
199 return rc;
200
201 if (pad_len)
202 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
203
204 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
205 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
206 ecdb_ahdr->reserved = 0;
207 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
208
209 ISCSI_DBG_SESSION(task->conn->session,
210 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
211 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
212 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
213 task->hdr_len);
214 return 0;
215 }
216
217 static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
218 {
219 struct scsi_cmnd *sc = task->sc;
220 struct iscsi_rlength_ahdr *rlen_ahdr;
221 int rc;
222
223 rlen_ahdr = iscsi_next_hdr(task);
224 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
225 if (rc)
226 return rc;
227
228 rlen_ahdr->ahslength =
229 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
230 sizeof(rlen_ahdr->reserved));
231 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
232 rlen_ahdr->reserved = 0;
233 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
234
235 ISCSI_DBG_SESSION(task->conn->session,
236 "bidi-in rlen_ahdr->read_length(%d) "
237 "rlen_ahdr->ahslength(%d)\n",
238 be32_to_cpu(rlen_ahdr->read_length),
239 be16_to_cpu(rlen_ahdr->ahslength));
240 return 0;
241 }
242
243 /**
244 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
245 * @task: iscsi task
246 *
247 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
248 * fields like dlength or final based on how much data it sends
249 */
250 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
251 {
252 struct iscsi_conn *conn = task->conn;
253 struct iscsi_session *session = conn->session;
254 struct scsi_cmnd *sc = task->sc;
255 struct iscsi_cmd *hdr;
256 unsigned hdrlength, cmd_len;
257 itt_t itt;
258 int rc;
259
260 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
261 if (rc)
262 return rc;
263 hdr = (struct iscsi_cmd *) task->hdr;
264 itt = hdr->itt;
265 memset(hdr, 0, sizeof(*hdr));
266
267 if (session->tt->parse_pdu_itt)
268 hdr->itt = task->hdr_itt = itt;
269 else
270 hdr->itt = task->hdr_itt = build_itt(task->itt,
271 task->conn->session->age);
272 task->hdr_len = 0;
273 rc = iscsi_add_hdr(task, sizeof(*hdr));
274 if (rc)
275 return rc;
276 hdr->opcode = ISCSI_OP_SCSI_CMD;
277 hdr->flags = ISCSI_ATTR_SIMPLE;
278 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
279 memcpy(task->lun, hdr->lun, sizeof(task->lun));
280 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
281 session->cmdsn++;
282 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
283 cmd_len = sc->cmd_len;
284 if (cmd_len < ISCSI_CDB_SIZE)
285 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
286 else if (cmd_len > ISCSI_CDB_SIZE) {
287 rc = iscsi_prep_ecdb_ahs(task);
288 if (rc)
289 return rc;
290 cmd_len = ISCSI_CDB_SIZE;
291 }
292 memcpy(hdr->cdb, sc->cmnd, cmd_len);
293
294 task->imm_count = 0;
295 if (scsi_bidi_cmnd(sc)) {
296 hdr->flags |= ISCSI_FLAG_CMD_READ;
297 rc = iscsi_prep_bidi_ahs(task);
298 if (rc)
299 return rc;
300 }
301 if (sc->sc_data_direction == DMA_TO_DEVICE) {
302 unsigned out_len = scsi_out(sc)->length;
303 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
304
305 hdr->data_length = cpu_to_be32(out_len);
306 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
307 /*
308 * Write counters:
309 *
310 * imm_count bytes to be sent right after
311 * SCSI PDU Header
312 *
313 * unsol_count bytes(as Data-Out) to be sent
314 * without R2T ack right after
315 * immediate data
316 *
317 * r2t data_length bytes to be sent via R2T ack's
318 *
319 * pad_count bytes to be sent as zero-padding
320 */
321 memset(r2t, 0, sizeof(*r2t));
322
323 if (session->imm_data_en) {
324 if (out_len >= session->first_burst)
325 task->imm_count = min(session->first_burst,
326 conn->max_xmit_dlength);
327 else
328 task->imm_count = min(out_len,
329 conn->max_xmit_dlength);
330 hton24(hdr->dlength, task->imm_count);
331 } else
332 zero_data(hdr->dlength);
333
334 if (!session->initial_r2t_en) {
335 r2t->data_length = min(session->first_burst, out_len) -
336 task->imm_count;
337 r2t->data_offset = task->imm_count;
338 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
339 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
340 }
341
342 if (!task->unsol_r2t.data_length)
343 /* No unsolicit Data-Out's */
344 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
345 } else {
346 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
347 zero_data(hdr->dlength);
348 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
349
350 if (sc->sc_data_direction == DMA_FROM_DEVICE)
351 hdr->flags |= ISCSI_FLAG_CMD_READ;
352 }
353
354 /* calculate size of additional header segments (AHSs) */
355 hdrlength = task->hdr_len - sizeof(*hdr);
356
357 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
358 hdrlength /= ISCSI_PAD_LEN;
359
360 WARN_ON(hdrlength >= 256);
361 hdr->hlength = hdrlength & 0xFF;
362
363 if (session->tt->init_task && session->tt->init_task(task))
364 return -EIO;
365
366 task->state = ISCSI_TASK_RUNNING;
367 list_move_tail(&task->running, &conn->run_list);
368
369 conn->scsicmd_pdus_cnt++;
370 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
371 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
372 scsi_bidi_cmnd(sc) ? "bidirectional" :
373 sc->sc_data_direction == DMA_TO_DEVICE ?
374 "write" : "read", conn->id, sc, sc->cmnd[0],
375 task->itt, scsi_bufflen(sc),
376 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
377 session->cmdsn,
378 session->max_cmdsn - session->exp_cmdsn + 1);
379 return 0;
380 }
381
382 /**
383 * iscsi_complete_command - finish a task
384 * @task: iscsi cmd task
385 *
386 * Must be called with session lock.
387 * This function returns the scsi command to scsi-ml or cleans
388 * up mgmt tasks then returns the task to the pool.
389 */
390 static void iscsi_complete_command(struct iscsi_task *task)
391 {
392 struct iscsi_conn *conn = task->conn;
393 struct iscsi_session *session = conn->session;
394 struct scsi_cmnd *sc = task->sc;
395
396 session->tt->cleanup_task(task);
397 list_del_init(&task->running);
398 task->state = ISCSI_TASK_COMPLETED;
399 task->sc = NULL;
400
401 if (conn->task == task)
402 conn->task = NULL;
403 /*
404 * login task is preallocated so do not free
405 */
406 if (conn->login_task == task)
407 return;
408
409 __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
410
411 if (conn->ping_task == task)
412 conn->ping_task = NULL;
413
414 if (sc) {
415 task->sc = NULL;
416 /* SCSI eh reuses commands to verify us */
417 sc->SCp.ptr = NULL;
418 /*
419 * queue command may call this to free the task, but
420 * not have setup the sc callback
421 */
422 if (sc->scsi_done)
423 sc->scsi_done(sc);
424 }
425 }
426
427 void __iscsi_get_task(struct iscsi_task *task)
428 {
429 atomic_inc(&task->refcount);
430 }
431 EXPORT_SYMBOL_GPL(__iscsi_get_task);
432
433 static void __iscsi_put_task(struct iscsi_task *task)
434 {
435 if (atomic_dec_and_test(&task->refcount))
436 iscsi_complete_command(task);
437 }
438
439 void iscsi_put_task(struct iscsi_task *task)
440 {
441 struct iscsi_session *session = task->conn->session;
442
443 spin_lock_bh(&session->lock);
444 __iscsi_put_task(task);
445 spin_unlock_bh(&session->lock);
446 }
447 EXPORT_SYMBOL_GPL(iscsi_put_task);
448
449 /*
450 * session lock must be held
451 */
452 static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
453 int err)
454 {
455 struct scsi_cmnd *sc;
456
457 sc = task->sc;
458 if (!sc)
459 return;
460
461 if (task->state == ISCSI_TASK_PENDING)
462 /*
463 * cmd never made it to the xmit thread, so we should not count
464 * the cmd in the sequencing
465 */
466 conn->session->queued_cmdsn--;
467
468 sc->result = err;
469 if (!scsi_bidi_cmnd(sc))
470 scsi_set_resid(sc, scsi_bufflen(sc));
471 else {
472 scsi_out(sc)->resid = scsi_out(sc)->length;
473 scsi_in(sc)->resid = scsi_in(sc)->length;
474 }
475
476 if (conn->task == task)
477 conn->task = NULL;
478 /* release ref from queuecommand */
479 __iscsi_put_task(task);
480 }
481
482 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
483 struct iscsi_task *task)
484 {
485 struct iscsi_session *session = conn->session;
486 struct iscsi_hdr *hdr = task->hdr;
487 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
488
489 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
490 return -ENOTCONN;
491
492 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
493 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
494 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
495 /*
496 * pre-format CmdSN for outgoing PDU.
497 */
498 nop->cmdsn = cpu_to_be32(session->cmdsn);
499 if (hdr->itt != RESERVED_ITT) {
500 /*
501 * TODO: We always use immediate, so we never hit this.
502 * If we start to send tmfs or nops as non-immediate then
503 * we should start checking the cmdsn numbers for mgmt tasks.
504 */
505 if (conn->c_stage == ISCSI_CONN_STARTED &&
506 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
507 session->queued_cmdsn++;
508 session->cmdsn++;
509 }
510 }
511
512 if (session->tt->init_task && session->tt->init_task(task))
513 return -EIO;
514
515 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
516 session->state = ISCSI_STATE_LOGGING_OUT;
517
518 task->state = ISCSI_TASK_RUNNING;
519 list_move_tail(&task->running, &conn->mgmt_run_list);
520 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
521 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
522 hdr->itt, task->data_count);
523 return 0;
524 }
525
526 static struct iscsi_task *
527 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
528 char *data, uint32_t data_size)
529 {
530 struct iscsi_session *session = conn->session;
531 struct iscsi_task *task;
532 itt_t itt;
533
534 if (session->state == ISCSI_STATE_TERMINATE)
535 return NULL;
536
537 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
538 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
539 /*
540 * Login and Text are sent serially, in
541 * request-followed-by-response sequence.
542 * Same task can be used. Same ITT must be used.
543 * Note that login_task is preallocated at conn_create().
544 */
545 task = conn->login_task;
546 else {
547 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
548 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
549
550 if (!__kfifo_get(session->cmdpool.queue,
551 (void*)&task, sizeof(void*)))
552 return NULL;
553 }
554 /*
555 * released in complete pdu for task we expect a response for, and
556 * released by the lld when it has transmitted the task for
557 * pdus we do not expect a response for.
558 */
559 atomic_set(&task->refcount, 1);
560 task->conn = conn;
561 task->sc = NULL;
562
563 if (data_size) {
564 memcpy(task->data, data, data_size);
565 task->data_count = data_size;
566 } else
567 task->data_count = 0;
568
569 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
570 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
571 "pdu for mgmt task.\n");
572 goto requeue_task;
573 }
574 itt = task->hdr->itt;
575 task->hdr_len = sizeof(struct iscsi_hdr);
576 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
577
578 if (hdr->itt != RESERVED_ITT) {
579 if (session->tt->parse_pdu_itt)
580 task->hdr->itt = itt;
581 else
582 task->hdr->itt = build_itt(task->itt,
583 task->conn->session->age);
584 }
585
586 INIT_LIST_HEAD(&task->running);
587 list_add_tail(&task->running, &conn->mgmtqueue);
588
589 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
590 if (iscsi_prep_mgmt_task(conn, task))
591 goto free_task;
592
593 if (session->tt->xmit_task(task))
594 goto free_task;
595
596 } else
597 iscsi_conn_queue_work(conn);
598
599 return task;
600
601 free_task:
602 __iscsi_put_task(task);
603 return NULL;
604
605 requeue_task:
606 if (task != conn->login_task)
607 __kfifo_put(session->cmdpool.queue, (void*)&task,
608 sizeof(void*));
609 return NULL;
610 }
611
612 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
613 char *data, uint32_t data_size)
614 {
615 struct iscsi_conn *conn = cls_conn->dd_data;
616 struct iscsi_session *session = conn->session;
617 int err = 0;
618
619 spin_lock_bh(&session->lock);
620 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
621 err = -EPERM;
622 spin_unlock_bh(&session->lock);
623 return err;
624 }
625 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
626
627 /**
628 * iscsi_cmd_rsp - SCSI Command Response processing
629 * @conn: iscsi connection
630 * @hdr: iscsi header
631 * @task: scsi command task
632 * @data: cmd data buffer
633 * @datalen: len of buffer
634 *
635 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
636 * then completes the command and task.
637 **/
638 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
639 struct iscsi_task *task, char *data,
640 int datalen)
641 {
642 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
643 struct iscsi_session *session = conn->session;
644 struct scsi_cmnd *sc = task->sc;
645
646 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
647 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
648
649 sc->result = (DID_OK << 16) | rhdr->cmd_status;
650
651 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
652 sc->result = DID_ERROR << 16;
653 goto out;
654 }
655
656 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
657 uint16_t senselen;
658
659 if (datalen < 2) {
660 invalid_datalen:
661 iscsi_conn_printk(KERN_ERR, conn,
662 "Got CHECK_CONDITION but invalid data "
663 "buffer size of %d\n", datalen);
664 sc->result = DID_BAD_TARGET << 16;
665 goto out;
666 }
667
668 senselen = get_unaligned_be16(data);
669 if (datalen < senselen)
670 goto invalid_datalen;
671
672 memcpy(sc->sense_buffer, data + 2,
673 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
674 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
675 min_t(uint16_t, senselen,
676 SCSI_SENSE_BUFFERSIZE));
677 }
678
679 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
680 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
681 int res_count = be32_to_cpu(rhdr->bi_residual_count);
682
683 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
684 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
685 res_count <= scsi_in(sc)->length))
686 scsi_in(sc)->resid = res_count;
687 else
688 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
689 }
690
691 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
692 ISCSI_FLAG_CMD_OVERFLOW)) {
693 int res_count = be32_to_cpu(rhdr->residual_count);
694
695 if (res_count > 0 &&
696 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
697 res_count <= scsi_bufflen(sc)))
698 /* write side for bidi or uni-io set_resid */
699 scsi_set_resid(sc, res_count);
700 else
701 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
702 }
703 out:
704 ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n",
705 sc, sc->result, task->itt);
706 conn->scsirsp_pdus_cnt++;
707
708 __iscsi_put_task(task);
709 }
710
711 /**
712 * iscsi_data_in_rsp - SCSI Data-In Response processing
713 * @conn: iscsi connection
714 * @hdr: iscsi pdu
715 * @task: scsi command task
716 **/
717 static void
718 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
719 struct iscsi_task *task)
720 {
721 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
722 struct scsi_cmnd *sc = task->sc;
723
724 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
725 return;
726
727 sc->result = (DID_OK << 16) | rhdr->cmd_status;
728 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
729 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
730 ISCSI_FLAG_DATA_OVERFLOW)) {
731 int res_count = be32_to_cpu(rhdr->residual_count);
732
733 if (res_count > 0 &&
734 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
735 res_count <= scsi_in(sc)->length))
736 scsi_in(sc)->resid = res_count;
737 else
738 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
739 }
740
741 conn->scsirsp_pdus_cnt++;
742 __iscsi_put_task(task);
743 }
744
745 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
746 {
747 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
748
749 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
750 conn->tmfrsp_pdus_cnt++;
751
752 if (conn->tmf_state != TMF_QUEUED)
753 return;
754
755 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
756 conn->tmf_state = TMF_SUCCESS;
757 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
758 conn->tmf_state = TMF_NOT_FOUND;
759 else
760 conn->tmf_state = TMF_FAILED;
761 wake_up(&conn->ehwait);
762 }
763
764 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
765 {
766 struct iscsi_nopout hdr;
767 struct iscsi_task *task;
768
769 if (!rhdr && conn->ping_task)
770 return;
771
772 memset(&hdr, 0, sizeof(struct iscsi_nopout));
773 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
774 hdr.flags = ISCSI_FLAG_CMD_FINAL;
775
776 if (rhdr) {
777 memcpy(hdr.lun, rhdr->lun, 8);
778 hdr.ttt = rhdr->ttt;
779 hdr.itt = RESERVED_ITT;
780 } else
781 hdr.ttt = RESERVED_ITT;
782
783 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
784 if (!task)
785 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
786 else if (!rhdr) {
787 /* only track our nops */
788 conn->ping_task = task;
789 conn->last_ping = jiffies;
790 }
791 }
792
793 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
794 char *data, int datalen)
795 {
796 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
797 struct iscsi_hdr rejected_pdu;
798
799 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
800
801 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
802 if (ntoh24(reject->dlength) > datalen)
803 return ISCSI_ERR_PROTO;
804
805 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
806 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
807 iscsi_conn_printk(KERN_ERR, conn,
808 "pdu (op 0x%x) rejected "
809 "due to DataDigest error.\n",
810 rejected_pdu.opcode);
811 }
812 }
813 return 0;
814 }
815
816 /**
817 * iscsi_itt_to_task - look up task by itt
818 * @conn: iscsi connection
819 * @itt: itt
820 *
821 * This should be used for mgmt tasks like login and nops, or if
822 * the LDD's itt space does not include the session age.
823 *
824 * The session lock must be held.
825 */
826 static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
827 {
828 struct iscsi_session *session = conn->session;
829 int i;
830
831 if (itt == RESERVED_ITT)
832 return NULL;
833
834 if (session->tt->parse_pdu_itt)
835 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
836 else
837 i = get_itt(itt);
838 if (i >= session->cmds_max)
839 return NULL;
840
841 return session->cmds[i];
842 }
843
844 /**
845 * __iscsi_complete_pdu - complete pdu
846 * @conn: iscsi conn
847 * @hdr: iscsi header
848 * @data: data buffer
849 * @datalen: len of data buffer
850 *
851 * Completes pdu processing by freeing any resources allocated at
852 * queuecommand or send generic. session lock must be held and verify
853 * itt must have been called.
854 */
855 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
856 char *data, int datalen)
857 {
858 struct iscsi_session *session = conn->session;
859 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
860 struct iscsi_task *task;
861 uint32_t itt;
862
863 conn->last_recv = jiffies;
864 rc = iscsi_verify_itt(conn, hdr->itt);
865 if (rc)
866 return rc;
867
868 if (hdr->itt != RESERVED_ITT)
869 itt = get_itt(hdr->itt);
870 else
871 itt = ~0U;
872
873 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
874 opcode, conn->id, itt, datalen);
875
876 if (itt == ~0U) {
877 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
878
879 switch(opcode) {
880 case ISCSI_OP_NOOP_IN:
881 if (datalen) {
882 rc = ISCSI_ERR_PROTO;
883 break;
884 }
885
886 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
887 break;
888
889 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
890 break;
891 case ISCSI_OP_REJECT:
892 rc = iscsi_handle_reject(conn, hdr, data, datalen);
893 break;
894 case ISCSI_OP_ASYNC_EVENT:
895 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
896 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
897 rc = ISCSI_ERR_CONN_FAILED;
898 break;
899 default:
900 rc = ISCSI_ERR_BAD_OPCODE;
901 break;
902 }
903 goto out;
904 }
905
906 switch(opcode) {
907 case ISCSI_OP_SCSI_CMD_RSP:
908 case ISCSI_OP_SCSI_DATA_IN:
909 task = iscsi_itt_to_ctask(conn, hdr->itt);
910 if (!task)
911 return ISCSI_ERR_BAD_ITT;
912 break;
913 case ISCSI_OP_R2T:
914 /*
915 * LLD handles R2Ts if they need to.
916 */
917 return 0;
918 case ISCSI_OP_LOGOUT_RSP:
919 case ISCSI_OP_LOGIN_RSP:
920 case ISCSI_OP_TEXT_RSP:
921 case ISCSI_OP_SCSI_TMFUNC_RSP:
922 case ISCSI_OP_NOOP_IN:
923 task = iscsi_itt_to_task(conn, hdr->itt);
924 if (!task)
925 return ISCSI_ERR_BAD_ITT;
926 break;
927 default:
928 return ISCSI_ERR_BAD_OPCODE;
929 }
930
931 switch(opcode) {
932 case ISCSI_OP_SCSI_CMD_RSP:
933 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
934 break;
935 case ISCSI_OP_SCSI_DATA_IN:
936 iscsi_data_in_rsp(conn, hdr, task);
937 break;
938 case ISCSI_OP_LOGOUT_RSP:
939 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
940 if (datalen) {
941 rc = ISCSI_ERR_PROTO;
942 break;
943 }
944 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
945 goto recv_pdu;
946 case ISCSI_OP_LOGIN_RSP:
947 case ISCSI_OP_TEXT_RSP:
948 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
949 /*
950 * login related PDU's exp_statsn is handled in
951 * userspace
952 */
953 goto recv_pdu;
954 case ISCSI_OP_SCSI_TMFUNC_RSP:
955 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
956 if (datalen) {
957 rc = ISCSI_ERR_PROTO;
958 break;
959 }
960
961 iscsi_tmf_rsp(conn, hdr);
962 __iscsi_put_task(task);
963 break;
964 case ISCSI_OP_NOOP_IN:
965 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
966 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
967 rc = ISCSI_ERR_PROTO;
968 break;
969 }
970 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
971
972 if (conn->ping_task != task)
973 /*
974 * If this is not in response to one of our
975 * nops then it must be from userspace.
976 */
977 goto recv_pdu;
978
979 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
980 __iscsi_put_task(task);
981 break;
982 default:
983 rc = ISCSI_ERR_BAD_OPCODE;
984 break;
985 }
986
987 out:
988 return rc;
989 recv_pdu:
990 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
991 rc = ISCSI_ERR_CONN_FAILED;
992 __iscsi_put_task(task);
993 return rc;
994 }
995 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
996
997 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
998 char *data, int datalen)
999 {
1000 int rc;
1001
1002 spin_lock(&conn->session->lock);
1003 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1004 spin_unlock(&conn->session->lock);
1005 return rc;
1006 }
1007 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1008
1009 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1010 {
1011 struct iscsi_session *session = conn->session;
1012 int age = 0, i = 0;
1013
1014 if (itt == RESERVED_ITT)
1015 return 0;
1016
1017 if (session->tt->parse_pdu_itt)
1018 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1019 else {
1020 i = get_itt(itt);
1021 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1022 }
1023
1024 if (age != session->age) {
1025 iscsi_conn_printk(KERN_ERR, conn,
1026 "received itt %x expected session age (%x)\n",
1027 (__force u32)itt, session->age);
1028 return ISCSI_ERR_BAD_ITT;
1029 }
1030
1031 if (i >= session->cmds_max) {
1032 iscsi_conn_printk(KERN_ERR, conn,
1033 "received invalid itt index %u (max cmds "
1034 "%u.\n", i, session->cmds_max);
1035 return ISCSI_ERR_BAD_ITT;
1036 }
1037 return 0;
1038 }
1039 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1040
1041 /**
1042 * iscsi_itt_to_ctask - look up ctask by itt
1043 * @conn: iscsi connection
1044 * @itt: itt
1045 *
1046 * This should be used for cmd tasks.
1047 *
1048 * The session lock must be held.
1049 */
1050 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1051 {
1052 struct iscsi_task *task;
1053
1054 if (iscsi_verify_itt(conn, itt))
1055 return NULL;
1056
1057 task = iscsi_itt_to_task(conn, itt);
1058 if (!task || !task->sc)
1059 return NULL;
1060
1061 if (task->sc->SCp.phase != conn->session->age) {
1062 iscsi_session_printk(KERN_ERR, conn->session,
1063 "task's session age %d, expected %d\n",
1064 task->sc->SCp.phase, conn->session->age);
1065 return NULL;
1066 }
1067
1068 return task;
1069 }
1070 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1071
1072 void iscsi_session_failure(struct iscsi_session *session,
1073 enum iscsi_err err)
1074 {
1075 struct iscsi_conn *conn;
1076 struct device *dev;
1077 unsigned long flags;
1078
1079 spin_lock_irqsave(&session->lock, flags);
1080 conn = session->leadconn;
1081 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1082 spin_unlock_irqrestore(&session->lock, flags);
1083 return;
1084 }
1085
1086 dev = get_device(&conn->cls_conn->dev);
1087 spin_unlock_irqrestore(&session->lock, flags);
1088 if (!dev)
1089 return;
1090 /*
1091 * if the host is being removed bypass the connection
1092 * recovery initialization because we are going to kill
1093 * the session.
1094 */
1095 if (err == ISCSI_ERR_INVALID_HOST)
1096 iscsi_conn_error_event(conn->cls_conn, err);
1097 else
1098 iscsi_conn_failure(conn, err);
1099 put_device(dev);
1100 }
1101 EXPORT_SYMBOL_GPL(iscsi_session_failure);
1102
1103 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1104 {
1105 struct iscsi_session *session = conn->session;
1106 unsigned long flags;
1107
1108 spin_lock_irqsave(&session->lock, flags);
1109 if (session->state == ISCSI_STATE_FAILED) {
1110 spin_unlock_irqrestore(&session->lock, flags);
1111 return;
1112 }
1113
1114 if (conn->stop_stage == 0)
1115 session->state = ISCSI_STATE_FAILED;
1116 spin_unlock_irqrestore(&session->lock, flags);
1117
1118 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1119 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1120 iscsi_conn_error_event(conn->cls_conn, err);
1121 }
1122 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1123
1124 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1125 {
1126 struct iscsi_session *session = conn->session;
1127
1128 /*
1129 * Check for iSCSI window and take care of CmdSN wrap-around
1130 */
1131 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1132 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1133 "%u MaxCmdSN %u CmdSN %u/%u\n",
1134 session->exp_cmdsn, session->max_cmdsn,
1135 session->cmdsn, session->queued_cmdsn);
1136 return -ENOSPC;
1137 }
1138 return 0;
1139 }
1140
1141 static int iscsi_xmit_task(struct iscsi_conn *conn)
1142 {
1143 struct iscsi_task *task = conn->task;
1144 int rc;
1145
1146 __iscsi_get_task(task);
1147 spin_unlock_bh(&conn->session->lock);
1148 rc = conn->session->tt->xmit_task(task);
1149 spin_lock_bh(&conn->session->lock);
1150 __iscsi_put_task(task);
1151 if (!rc)
1152 /* done with this task */
1153 conn->task = NULL;
1154 return rc;
1155 }
1156
1157 /**
1158 * iscsi_requeue_task - requeue task to run from session workqueue
1159 * @task: task to requeue
1160 *
1161 * LLDs that need to run a task from the session workqueue should call
1162 * this. The session lock must be held. This should only be called
1163 * by software drivers.
1164 */
1165 void iscsi_requeue_task(struct iscsi_task *task)
1166 {
1167 struct iscsi_conn *conn = task->conn;
1168
1169 list_move_tail(&task->running, &conn->requeue);
1170 iscsi_conn_queue_work(conn);
1171 }
1172 EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1173
1174 /**
1175 * iscsi_data_xmit - xmit any command into the scheduled connection
1176 * @conn: iscsi connection
1177 *
1178 * Notes:
1179 * The function can return -EAGAIN in which case the caller must
1180 * re-schedule it again later or recover. '0' return code means
1181 * successful xmit.
1182 **/
1183 static int iscsi_data_xmit(struct iscsi_conn *conn)
1184 {
1185 int rc = 0;
1186
1187 spin_lock_bh(&conn->session->lock);
1188 if (unlikely(conn->suspend_tx)) {
1189 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1190 spin_unlock_bh(&conn->session->lock);
1191 return -ENODATA;
1192 }
1193
1194 if (conn->task) {
1195 rc = iscsi_xmit_task(conn);
1196 if (rc)
1197 goto again;
1198 }
1199
1200 /*
1201 * process mgmt pdus like nops before commands since we should
1202 * only have one nop-out as a ping from us and targets should not
1203 * overflow us with nop-ins
1204 */
1205 check_mgmt:
1206 while (!list_empty(&conn->mgmtqueue)) {
1207 conn->task = list_entry(conn->mgmtqueue.next,
1208 struct iscsi_task, running);
1209 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1210 __iscsi_put_task(conn->task);
1211 conn->task = NULL;
1212 continue;
1213 }
1214 rc = iscsi_xmit_task(conn);
1215 if (rc)
1216 goto again;
1217 }
1218
1219 /* process pending command queue */
1220 while (!list_empty(&conn->xmitqueue)) {
1221 if (conn->tmf_state == TMF_QUEUED)
1222 break;
1223
1224 conn->task = list_entry(conn->xmitqueue.next,
1225 struct iscsi_task, running);
1226 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1227 fail_command(conn, conn->task, DID_IMM_RETRY << 16);
1228 continue;
1229 }
1230 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1231 if (rc) {
1232 if (rc == -ENOMEM) {
1233 conn->task = NULL;
1234 goto again;
1235 } else
1236 fail_command(conn, conn->task, DID_ABORT << 16);
1237 continue;
1238 }
1239 rc = iscsi_xmit_task(conn);
1240 if (rc)
1241 goto again;
1242 /*
1243 * we could continuously get new task requests so
1244 * we need to check the mgmt queue for nops that need to
1245 * be sent to aviod starvation
1246 */
1247 if (!list_empty(&conn->mgmtqueue))
1248 goto check_mgmt;
1249 }
1250
1251 while (!list_empty(&conn->requeue)) {
1252 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1253 break;
1254
1255 /*
1256 * we always do fastlogout - conn stop code will clean up.
1257 */
1258 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1259 break;
1260
1261 conn->task = list_entry(conn->requeue.next,
1262 struct iscsi_task, running);
1263 conn->task->state = ISCSI_TASK_RUNNING;
1264 list_move_tail(conn->requeue.next, &conn->run_list);
1265 rc = iscsi_xmit_task(conn);
1266 if (rc)
1267 goto again;
1268 if (!list_empty(&conn->mgmtqueue))
1269 goto check_mgmt;
1270 }
1271 spin_unlock_bh(&conn->session->lock);
1272 return -ENODATA;
1273
1274 again:
1275 if (unlikely(conn->suspend_tx))
1276 rc = -ENODATA;
1277 spin_unlock_bh(&conn->session->lock);
1278 return rc;
1279 }
1280
1281 static void iscsi_xmitworker(struct work_struct *work)
1282 {
1283 struct iscsi_conn *conn =
1284 container_of(work, struct iscsi_conn, xmitwork);
1285 int rc;
1286 /*
1287 * serialize Xmit worker on a per-connection basis.
1288 */
1289 do {
1290 rc = iscsi_data_xmit(conn);
1291 } while (rc >= 0 || rc == -EAGAIN);
1292 }
1293
1294 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1295 struct scsi_cmnd *sc)
1296 {
1297 struct iscsi_task *task;
1298
1299 if (!__kfifo_get(conn->session->cmdpool.queue,
1300 (void *) &task, sizeof(void *)))
1301 return NULL;
1302
1303 sc->SCp.phase = conn->session->age;
1304 sc->SCp.ptr = (char *) task;
1305
1306 atomic_set(&task->refcount, 1);
1307 task->state = ISCSI_TASK_PENDING;
1308 task->conn = conn;
1309 task->sc = sc;
1310 INIT_LIST_HEAD(&task->running);
1311 return task;
1312 }
1313
1314 enum {
1315 FAILURE_BAD_HOST = 1,
1316 FAILURE_SESSION_FAILED,
1317 FAILURE_SESSION_FREED,
1318 FAILURE_WINDOW_CLOSED,
1319 FAILURE_OOM,
1320 FAILURE_SESSION_TERMINATE,
1321 FAILURE_SESSION_IN_RECOVERY,
1322 FAILURE_SESSION_RECOVERY_TIMEOUT,
1323 FAILURE_SESSION_LOGGING_OUT,
1324 FAILURE_SESSION_NOT_READY,
1325 };
1326
1327 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1328 {
1329 struct iscsi_cls_session *cls_session;
1330 struct Scsi_Host *host;
1331 int reason = 0;
1332 struct iscsi_session *session;
1333 struct iscsi_conn *conn;
1334 struct iscsi_task *task = NULL;
1335
1336 sc->scsi_done = done;
1337 sc->result = 0;
1338 sc->SCp.ptr = NULL;
1339
1340 host = sc->device->host;
1341 spin_unlock(host->host_lock);
1342
1343 cls_session = starget_to_session(scsi_target(sc->device));
1344 session = cls_session->dd_data;
1345 spin_lock(&session->lock);
1346
1347 reason = iscsi_session_chkready(cls_session);
1348 if (reason) {
1349 sc->result = reason;
1350 goto fault;
1351 }
1352
1353 /*
1354 * ISCSI_STATE_FAILED is a temp. state. The recovery
1355 * code will decide what is best to do with command queued
1356 * during this time
1357 */
1358 if (session->state != ISCSI_STATE_LOGGED_IN &&
1359 session->state != ISCSI_STATE_FAILED) {
1360 /*
1361 * to handle the race between when we set the recovery state
1362 * and block the session we requeue here (commands could
1363 * be entering our queuecommand while a block is starting
1364 * up because the block code is not locked)
1365 */
1366 switch (session->state) {
1367 case ISCSI_STATE_IN_RECOVERY:
1368 reason = FAILURE_SESSION_IN_RECOVERY;
1369 goto reject;
1370 case ISCSI_STATE_LOGGING_OUT:
1371 reason = FAILURE_SESSION_LOGGING_OUT;
1372 goto reject;
1373 case ISCSI_STATE_RECOVERY_FAILED:
1374 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1375 sc->result = DID_TRANSPORT_FAILFAST << 16;
1376 break;
1377 case ISCSI_STATE_TERMINATE:
1378 reason = FAILURE_SESSION_TERMINATE;
1379 sc->result = DID_NO_CONNECT << 16;
1380 break;
1381 default:
1382 reason = FAILURE_SESSION_FREED;
1383 sc->result = DID_NO_CONNECT << 16;
1384 }
1385 goto fault;
1386 }
1387
1388 conn = session->leadconn;
1389 if (!conn) {
1390 reason = FAILURE_SESSION_FREED;
1391 sc->result = DID_NO_CONNECT << 16;
1392 goto fault;
1393 }
1394
1395 if (iscsi_check_cmdsn_window_closed(conn)) {
1396 reason = FAILURE_WINDOW_CLOSED;
1397 goto reject;
1398 }
1399
1400 task = iscsi_alloc_task(conn, sc);
1401 if (!task) {
1402 reason = FAILURE_OOM;
1403 goto reject;
1404 }
1405 list_add_tail(&task->running, &conn->xmitqueue);
1406
1407 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
1408 reason = iscsi_prep_scsi_cmd_pdu(task);
1409 if (reason) {
1410 if (reason == -ENOMEM) {
1411 reason = FAILURE_OOM;
1412 goto prepd_reject;
1413 } else {
1414 sc->result = DID_ABORT << 16;
1415 goto prepd_fault;
1416 }
1417 }
1418 if (session->tt->xmit_task(task)) {
1419 reason = FAILURE_SESSION_NOT_READY;
1420 goto prepd_reject;
1421 }
1422 } else
1423 iscsi_conn_queue_work(conn);
1424
1425 session->queued_cmdsn++;
1426 spin_unlock(&session->lock);
1427 spin_lock(host->host_lock);
1428 return 0;
1429
1430 prepd_reject:
1431 sc->scsi_done = NULL;
1432 iscsi_complete_command(task);
1433 reject:
1434 spin_unlock(&session->lock);
1435 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1436 sc->cmnd[0], reason);
1437 spin_lock(host->host_lock);
1438 return SCSI_MLQUEUE_TARGET_BUSY;
1439
1440 prepd_fault:
1441 sc->scsi_done = NULL;
1442 iscsi_complete_command(task);
1443 fault:
1444 spin_unlock(&session->lock);
1445 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1446 sc->cmnd[0], reason);
1447 if (!scsi_bidi_cmnd(sc))
1448 scsi_set_resid(sc, scsi_bufflen(sc));
1449 else {
1450 scsi_out(sc)->resid = scsi_out(sc)->length;
1451 scsi_in(sc)->resid = scsi_in(sc)->length;
1452 }
1453 done(sc);
1454 spin_lock(host->host_lock);
1455 return 0;
1456 }
1457 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1458
1459 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1460 {
1461 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1462 return sdev->queue_depth;
1463 }
1464 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1465
1466 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1467 {
1468 struct iscsi_session *session = cls_session->dd_data;
1469
1470 spin_lock_bh(&session->lock);
1471 if (session->state != ISCSI_STATE_LOGGED_IN) {
1472 session->state = ISCSI_STATE_RECOVERY_FAILED;
1473 if (session->leadconn)
1474 wake_up(&session->leadconn->ehwait);
1475 }
1476 spin_unlock_bh(&session->lock);
1477 }
1478 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1479
1480 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
1481 {
1482 struct iscsi_cls_session *cls_session;
1483 struct iscsi_session *session;
1484 struct iscsi_conn *conn;
1485
1486 cls_session = starget_to_session(scsi_target(sc->device));
1487 session = cls_session->dd_data;
1488 conn = session->leadconn;
1489
1490 mutex_lock(&session->eh_mutex);
1491 spin_lock_bh(&session->lock);
1492 if (session->state == ISCSI_STATE_TERMINATE) {
1493 failed:
1494 iscsi_session_printk(KERN_INFO, session,
1495 "failing target reset: Could not log "
1496 "back into target [age %d]\n",
1497 session->age);
1498 spin_unlock_bh(&session->lock);
1499 mutex_unlock(&session->eh_mutex);
1500 return FAILED;
1501 }
1502
1503 spin_unlock_bh(&session->lock);
1504 mutex_unlock(&session->eh_mutex);
1505 /*
1506 * we drop the lock here but the leadconn cannot be destoyed while
1507 * we are in the scsi eh
1508 */
1509 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1510
1511 ISCSI_DBG_SESSION(session, "wait for relogin\n");
1512 wait_event_interruptible(conn->ehwait,
1513 session->state == ISCSI_STATE_TERMINATE ||
1514 session->state == ISCSI_STATE_LOGGED_IN ||
1515 session->state == ISCSI_STATE_RECOVERY_FAILED);
1516 if (signal_pending(current))
1517 flush_signals(current);
1518
1519 mutex_lock(&session->eh_mutex);
1520 spin_lock_bh(&session->lock);
1521 if (session->state == ISCSI_STATE_LOGGED_IN)
1522 iscsi_session_printk(KERN_INFO, session,
1523 "target reset succeeded\n");
1524 else
1525 goto failed;
1526 spin_unlock_bh(&session->lock);
1527 mutex_unlock(&session->eh_mutex);
1528 return SUCCESS;
1529 }
1530 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
1531
1532 static void iscsi_tmf_timedout(unsigned long data)
1533 {
1534 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1535 struct iscsi_session *session = conn->session;
1536
1537 spin_lock(&session->lock);
1538 if (conn->tmf_state == TMF_QUEUED) {
1539 conn->tmf_state = TMF_TIMEDOUT;
1540 ISCSI_DBG_SESSION(session, "tmf timedout\n");
1541 /* unblock eh_abort() */
1542 wake_up(&conn->ehwait);
1543 }
1544 spin_unlock(&session->lock);
1545 }
1546
1547 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1548 struct iscsi_tm *hdr, int age,
1549 int timeout)
1550 {
1551 struct iscsi_session *session = conn->session;
1552 struct iscsi_task *task;
1553
1554 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1555 NULL, 0);
1556 if (!task) {
1557 spin_unlock_bh(&session->lock);
1558 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1559 spin_lock_bh(&session->lock);
1560 ISCSI_DBG_SESSION(session, "tmf exec failure\n");
1561 return -EPERM;
1562 }
1563 conn->tmfcmd_pdus_cnt++;
1564 conn->tmf_timer.expires = timeout * HZ + jiffies;
1565 conn->tmf_timer.function = iscsi_tmf_timedout;
1566 conn->tmf_timer.data = (unsigned long)conn;
1567 add_timer(&conn->tmf_timer);
1568 ISCSI_DBG_SESSION(session, "tmf set timeout\n");
1569
1570 spin_unlock_bh(&session->lock);
1571 mutex_unlock(&session->eh_mutex);
1572
1573 /*
1574 * block eh thread until:
1575 *
1576 * 1) tmf response
1577 * 2) tmf timeout
1578 * 3) session is terminated or restarted or userspace has
1579 * given up on recovery
1580 */
1581 wait_event_interruptible(conn->ehwait, age != session->age ||
1582 session->state != ISCSI_STATE_LOGGED_IN ||
1583 conn->tmf_state != TMF_QUEUED);
1584 if (signal_pending(current))
1585 flush_signals(current);
1586 del_timer_sync(&conn->tmf_timer);
1587
1588 mutex_lock(&session->eh_mutex);
1589 spin_lock_bh(&session->lock);
1590 /* if the session drops it will clean up the task */
1591 if (age != session->age ||
1592 session->state != ISCSI_STATE_LOGGED_IN)
1593 return -ENOTCONN;
1594 return 0;
1595 }
1596
1597 /*
1598 * Fail commands. session lock held and recv side suspended and xmit
1599 * thread flushed
1600 */
1601 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1602 int error)
1603 {
1604 struct iscsi_task *task, *tmp;
1605
1606 if (conn->task) {
1607 if (lun == -1 ||
1608 (conn->task->sc && conn->task->sc->device->lun == lun))
1609 conn->task = NULL;
1610 }
1611
1612 /* flush pending */
1613 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1614 if (lun == task->sc->device->lun || lun == -1) {
1615 ISCSI_DBG_SESSION(conn->session,
1616 "failing pending sc %p itt 0x%x\n",
1617 task->sc, task->itt);
1618 fail_command(conn, task, error << 16);
1619 }
1620 }
1621
1622 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1623 if (lun == task->sc->device->lun || lun == -1) {
1624 ISCSI_DBG_SESSION(conn->session,
1625 "failing requeued sc %p itt 0x%x\n",
1626 task->sc, task->itt);
1627 fail_command(conn, task, error << 16);
1628 }
1629 }
1630
1631 /* fail all other running */
1632 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1633 if (lun == task->sc->device->lun || lun == -1) {
1634 ISCSI_DBG_SESSION(conn->session,
1635 "failing in progress sc %p itt 0x%x\n",
1636 task->sc, task->itt);
1637 fail_command(conn, task, error << 16);
1638 }
1639 }
1640 }
1641
1642 void iscsi_suspend_tx(struct iscsi_conn *conn)
1643 {
1644 struct Scsi_Host *shost = conn->session->host;
1645 struct iscsi_host *ihost = shost_priv(shost);
1646
1647 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1648 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1649 flush_workqueue(ihost->workq);
1650 }
1651 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1652
1653 static void iscsi_start_tx(struct iscsi_conn *conn)
1654 {
1655 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1656 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1657 iscsi_conn_queue_work(conn);
1658 }
1659
1660 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1661 {
1662 struct iscsi_cls_session *cls_session;
1663 struct iscsi_session *session;
1664 struct iscsi_conn *conn;
1665 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1666
1667 cls_session = starget_to_session(scsi_target(scmd->device));
1668 session = cls_session->dd_data;
1669
1670 ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd);
1671
1672 spin_lock(&session->lock);
1673 if (session->state != ISCSI_STATE_LOGGED_IN) {
1674 /*
1675 * We are probably in the middle of iscsi recovery so let
1676 * that complete and handle the error.
1677 */
1678 rc = BLK_EH_RESET_TIMER;
1679 goto done;
1680 }
1681
1682 conn = session->leadconn;
1683 if (!conn) {
1684 /* In the middle of shuting down */
1685 rc = BLK_EH_RESET_TIMER;
1686 goto done;
1687 }
1688
1689 if (!conn->recv_timeout && !conn->ping_timeout)
1690 goto done;
1691 /*
1692 * if the ping timedout then we are in the middle of cleaning up
1693 * and can let the iscsi eh handle it
1694 */
1695 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1696 (conn->ping_timeout * HZ), jiffies))
1697 rc = BLK_EH_RESET_TIMER;
1698 /*
1699 * if we are about to check the transport then give the command
1700 * more time
1701 */
1702 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1703 jiffies))
1704 rc = BLK_EH_RESET_TIMER;
1705 /* if in the middle of checking the transport then give us more time */
1706 if (conn->ping_task)
1707 rc = BLK_EH_RESET_TIMER;
1708 done:
1709 spin_unlock(&session->lock);
1710 ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
1711 "timer reset" : "nh");
1712 return rc;
1713 }
1714
1715 static void iscsi_check_transport_timeouts(unsigned long data)
1716 {
1717 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1718 struct iscsi_session *session = conn->session;
1719 unsigned long recv_timeout, next_timeout = 0, last_recv;
1720
1721 spin_lock(&session->lock);
1722 if (session->state != ISCSI_STATE_LOGGED_IN)
1723 goto done;
1724
1725 recv_timeout = conn->recv_timeout;
1726 if (!recv_timeout)
1727 goto done;
1728
1729 recv_timeout *= HZ;
1730 last_recv = conn->last_recv;
1731 if (conn->ping_task &&
1732 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
1733 jiffies)) {
1734 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1735 "expired, last rx %lu, last ping %lu, "
1736 "now %lu\n", conn->ping_timeout, last_recv,
1737 conn->last_ping, jiffies);
1738 spin_unlock(&session->lock);
1739 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1740 return;
1741 }
1742
1743 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
1744 /* send a ping to try to provoke some traffic */
1745 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
1746 iscsi_send_nopout(conn, NULL);
1747 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
1748 } else
1749 next_timeout = last_recv + recv_timeout;
1750
1751 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
1752 mod_timer(&conn->transport_timer, next_timeout);
1753 done:
1754 spin_unlock(&session->lock);
1755 }
1756
1757 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
1758 struct iscsi_tm *hdr)
1759 {
1760 memset(hdr, 0, sizeof(*hdr));
1761 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1762 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1763 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1764 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
1765 hdr->rtt = task->hdr_itt;
1766 hdr->refcmdsn = task->cmdsn;
1767 }
1768
1769 int iscsi_eh_abort(struct scsi_cmnd *sc)
1770 {
1771 struct iscsi_cls_session *cls_session;
1772 struct iscsi_session *session;
1773 struct iscsi_conn *conn;
1774 struct iscsi_task *task;
1775 struct iscsi_tm *hdr;
1776 int rc, age;
1777
1778 cls_session = starget_to_session(scsi_target(sc->device));
1779 session = cls_session->dd_data;
1780
1781 mutex_lock(&session->eh_mutex);
1782 spin_lock_bh(&session->lock);
1783 /*
1784 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1785 * got the command.
1786 */
1787 if (!sc->SCp.ptr) {
1788 ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or "
1789 "it completed.\n");
1790 spin_unlock_bh(&session->lock);
1791 mutex_unlock(&session->eh_mutex);
1792 return SUCCESS;
1793 }
1794
1795 /*
1796 * If we are not logged in or we have started a new session
1797 * then let the host reset code handle this
1798 */
1799 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1800 sc->SCp.phase != session->age) {
1801 spin_unlock_bh(&session->lock);
1802 mutex_unlock(&session->eh_mutex);
1803 return FAILED;
1804 }
1805
1806 conn = session->leadconn;
1807 conn->eh_abort_cnt++;
1808 age = session->age;
1809
1810 task = (struct iscsi_task *)sc->SCp.ptr;
1811 ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n",
1812 sc, task->itt);
1813
1814 /* task completed before time out */
1815 if (!task->sc) {
1816 ISCSI_DBG_SESSION(session, "sc completed while abort in "
1817 "progress\n");
1818 goto success;
1819 }
1820
1821 if (task->state == ISCSI_TASK_PENDING) {
1822 fail_command(conn, task, DID_ABORT << 16);
1823 goto success;
1824 }
1825
1826 /* only have one tmf outstanding at a time */
1827 if (conn->tmf_state != TMF_INITIAL)
1828 goto failed;
1829 conn->tmf_state = TMF_QUEUED;
1830
1831 hdr = &conn->tmhdr;
1832 iscsi_prep_abort_task_pdu(task, hdr);
1833
1834 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1835 rc = FAILED;
1836 goto failed;
1837 }
1838
1839 switch (conn->tmf_state) {
1840 case TMF_SUCCESS:
1841 spin_unlock_bh(&session->lock);
1842 /*
1843 * stop tx side incase the target had sent a abort rsp but
1844 * the initiator was still writing out data.
1845 */
1846 iscsi_suspend_tx(conn);
1847 /*
1848 * we do not stop the recv side because targets have been
1849 * good and have never sent us a successful tmf response
1850 * then sent more data for the cmd.
1851 */
1852 spin_lock(&session->lock);
1853 fail_command(conn, task, DID_ABORT << 16);
1854 conn->tmf_state = TMF_INITIAL;
1855 spin_unlock(&session->lock);
1856 iscsi_start_tx(conn);
1857 goto success_unlocked;
1858 case TMF_TIMEDOUT:
1859 spin_unlock_bh(&session->lock);
1860 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1861 goto failed_unlocked;
1862 case TMF_NOT_FOUND:
1863 if (!sc->SCp.ptr) {
1864 conn->tmf_state = TMF_INITIAL;
1865 /* task completed before tmf abort response */
1866 ISCSI_DBG_SESSION(session, "sc completed while abort "
1867 "in progress\n");
1868 goto success;
1869 }
1870 /* fall through */
1871 default:
1872 conn->tmf_state = TMF_INITIAL;
1873 goto failed;
1874 }
1875
1876 success:
1877 spin_unlock_bh(&session->lock);
1878 success_unlocked:
1879 ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n",
1880 sc, task->itt);
1881 mutex_unlock(&session->eh_mutex);
1882 return SUCCESS;
1883
1884 failed:
1885 spin_unlock_bh(&session->lock);
1886 failed_unlocked:
1887 ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc,
1888 task ? task->itt : 0);
1889 mutex_unlock(&session->eh_mutex);
1890 return FAILED;
1891 }
1892 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1893
1894 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1895 {
1896 memset(hdr, 0, sizeof(*hdr));
1897 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1898 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1899 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1900 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1901 hdr->rtt = RESERVED_ITT;
1902 }
1903
1904 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1905 {
1906 struct iscsi_cls_session *cls_session;
1907 struct iscsi_session *session;
1908 struct iscsi_conn *conn;
1909 struct iscsi_tm *hdr;
1910 int rc = FAILED;
1911
1912 cls_session = starget_to_session(scsi_target(sc->device));
1913 session = cls_session->dd_data;
1914
1915 ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n",
1916 sc, sc->device->lun);
1917
1918 mutex_lock(&session->eh_mutex);
1919 spin_lock_bh(&session->lock);
1920 /*
1921 * Just check if we are not logged in. We cannot check for
1922 * the phase because the reset could come from a ioctl.
1923 */
1924 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1925 goto unlock;
1926 conn = session->leadconn;
1927
1928 /* only have one tmf outstanding at a time */
1929 if (conn->tmf_state != TMF_INITIAL)
1930 goto unlock;
1931 conn->tmf_state = TMF_QUEUED;
1932
1933 hdr = &conn->tmhdr;
1934 iscsi_prep_lun_reset_pdu(sc, hdr);
1935
1936 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1937 session->lu_reset_timeout)) {
1938 rc = FAILED;
1939 goto unlock;
1940 }
1941
1942 switch (conn->tmf_state) {
1943 case TMF_SUCCESS:
1944 break;
1945 case TMF_TIMEDOUT:
1946 spin_unlock_bh(&session->lock);
1947 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1948 goto done;
1949 default:
1950 conn->tmf_state = TMF_INITIAL;
1951 goto unlock;
1952 }
1953
1954 rc = SUCCESS;
1955 spin_unlock_bh(&session->lock);
1956
1957 iscsi_suspend_tx(conn);
1958
1959 spin_lock_bh(&session->lock);
1960 fail_all_commands(conn, sc->device->lun, DID_ERROR);
1961 conn->tmf_state = TMF_INITIAL;
1962 spin_unlock_bh(&session->lock);
1963
1964 iscsi_start_tx(conn);
1965 goto done;
1966
1967 unlock:
1968 spin_unlock_bh(&session->lock);
1969 done:
1970 ISCSI_DBG_SESSION(session, "dev reset result = %s\n",
1971 rc == SUCCESS ? "SUCCESS" : "FAILED");
1972 mutex_unlock(&session->eh_mutex);
1973 return rc;
1974 }
1975 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1976
1977 /*
1978 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1979 * should be accessed via kfifo_{get,put} on q->queue.
1980 * Optionally, the caller can obtain the array of object pointers
1981 * by passing in a non-NULL @items pointer
1982 */
1983 int
1984 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1985 {
1986 int i, num_arrays = 1;
1987
1988 memset(q, 0, sizeof(*q));
1989
1990 q->max = max;
1991
1992 /* If the user passed an items pointer, he wants a copy of
1993 * the array. */
1994 if (items)
1995 num_arrays++;
1996 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1997 if (q->pool == NULL)
1998 return -ENOMEM;
1999
2000 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2001 GFP_KERNEL, NULL);
2002 if (IS_ERR(q->queue)) {
2003 q->queue = NULL;
2004 goto enomem;
2005 }
2006
2007 for (i = 0; i < max; i++) {
2008 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2009 if (q->pool[i] == NULL) {
2010 q->max = i;
2011 goto enomem;
2012 }
2013 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2014 }
2015
2016 if (items) {
2017 *items = q->pool + max;
2018 memcpy(*items, q->pool, max * sizeof(void *));
2019 }
2020
2021 return 0;
2022
2023 enomem:
2024 iscsi_pool_free(q);
2025 return -ENOMEM;
2026 }
2027 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2028
2029 void iscsi_pool_free(struct iscsi_pool *q)
2030 {
2031 int i;
2032
2033 for (i = 0; i < q->max; i++)
2034 kfree(q->pool[i]);
2035 kfree(q->pool);
2036 kfree(q->queue);
2037 }
2038 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2039
2040 /**
2041 * iscsi_host_add - add host to system
2042 * @shost: scsi host
2043 * @pdev: parent device
2044 *
2045 * This should be called by partial offload and software iscsi drivers
2046 * to add a host to the system.
2047 */
2048 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2049 {
2050 if (!shost->can_queue)
2051 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2052
2053 if (!shost->cmd_per_lun)
2054 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2055
2056 if (!shost->transportt->eh_timed_out)
2057 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2058 return scsi_add_host(shost, pdev);
2059 }
2060 EXPORT_SYMBOL_GPL(iscsi_host_add);
2061
2062 /**
2063 * iscsi_host_alloc - allocate a host and driver data
2064 * @sht: scsi host template
2065 * @dd_data_size: driver host data size
2066 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2067 *
2068 * This should be called by partial offload and software iscsi drivers.
2069 * To access the driver specific memory use the iscsi_host_priv() macro.
2070 */
2071 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2072 int dd_data_size, bool xmit_can_sleep)
2073 {
2074 struct Scsi_Host *shost;
2075 struct iscsi_host *ihost;
2076
2077 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2078 if (!shost)
2079 return NULL;
2080 ihost = shost_priv(shost);
2081
2082 if (xmit_can_sleep) {
2083 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2084 "iscsi_q_%d", shost->host_no);
2085 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2086 if (!ihost->workq)
2087 goto free_host;
2088 }
2089
2090 spin_lock_init(&ihost->lock);
2091 ihost->state = ISCSI_HOST_SETUP;
2092 ihost->num_sessions = 0;
2093 init_waitqueue_head(&ihost->session_removal_wq);
2094 return shost;
2095
2096 free_host:
2097 scsi_host_put(shost);
2098 return NULL;
2099 }
2100 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2101
2102 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2103 {
2104 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2105 }
2106
2107 /**
2108 * iscsi_host_remove - remove host and sessions
2109 * @shost: scsi host
2110 *
2111 * If there are any sessions left, this will initiate the removal and wait
2112 * for the completion.
2113 */
2114 void iscsi_host_remove(struct Scsi_Host *shost)
2115 {
2116 struct iscsi_host *ihost = shost_priv(shost);
2117 unsigned long flags;
2118
2119 spin_lock_irqsave(&ihost->lock, flags);
2120 ihost->state = ISCSI_HOST_REMOVED;
2121 spin_unlock_irqrestore(&ihost->lock, flags);
2122
2123 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2124 wait_event_interruptible(ihost->session_removal_wq,
2125 ihost->num_sessions == 0);
2126 if (signal_pending(current))
2127 flush_signals(current);
2128
2129 scsi_remove_host(shost);
2130 if (ihost->workq)
2131 destroy_workqueue(ihost->workq);
2132 }
2133 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2134
2135 void iscsi_host_free(struct Scsi_Host *shost)
2136 {
2137 struct iscsi_host *ihost = shost_priv(shost);
2138
2139 kfree(ihost->netdev);
2140 kfree(ihost->hwaddress);
2141 kfree(ihost->initiatorname);
2142 scsi_host_put(shost);
2143 }
2144 EXPORT_SYMBOL_GPL(iscsi_host_free);
2145
2146 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2147 {
2148 struct iscsi_host *ihost = shost_priv(shost);
2149 unsigned long flags;
2150
2151 shost = scsi_host_get(shost);
2152 if (!shost) {
2153 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2154 "of session teardown event because host already "
2155 "removed.\n");
2156 return;
2157 }
2158
2159 spin_lock_irqsave(&ihost->lock, flags);
2160 ihost->num_sessions--;
2161 if (ihost->num_sessions == 0)
2162 wake_up(&ihost->session_removal_wq);
2163 spin_unlock_irqrestore(&ihost->lock, flags);
2164 scsi_host_put(shost);
2165 }
2166
2167 /**
2168 * iscsi_session_setup - create iscsi cls session and host and session
2169 * @iscsit: iscsi transport template
2170 * @shost: scsi host
2171 * @cmds_max: session can queue
2172 * @cmd_task_size: LLD task private data size
2173 * @initial_cmdsn: initial CmdSN
2174 *
2175 * This can be used by software iscsi_transports that allocate
2176 * a session per scsi host.
2177 *
2178 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2179 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2180 * for nop handling and login/logout requests.
2181 */
2182 struct iscsi_cls_session *
2183 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2184 uint16_t cmds_max, int cmd_task_size,
2185 uint32_t initial_cmdsn, unsigned int id)
2186 {
2187 struct iscsi_host *ihost = shost_priv(shost);
2188 struct iscsi_session *session;
2189 struct iscsi_cls_session *cls_session;
2190 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2191 unsigned long flags;
2192
2193 spin_lock_irqsave(&ihost->lock, flags);
2194 if (ihost->state == ISCSI_HOST_REMOVED) {
2195 spin_unlock_irqrestore(&ihost->lock, flags);
2196 return NULL;
2197 }
2198 ihost->num_sessions++;
2199 spin_unlock_irqrestore(&ihost->lock, flags);
2200
2201 if (!total_cmds)
2202 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2203 /*
2204 * The iscsi layer needs some tasks for nop handling and tmfs,
2205 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2206 * + 1 command for scsi IO.
2207 */
2208 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2209 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2210 "must be a power of two that is at least %d.\n",
2211 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2212 goto dec_session_count;
2213 }
2214
2215 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2216 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2217 "must be a power of 2 less than or equal to %d.\n",
2218 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2219 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2220 }
2221
2222 if (!is_power_of_2(total_cmds)) {
2223 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2224 "must be a power of 2.\n", total_cmds);
2225 total_cmds = rounddown_pow_of_two(total_cmds);
2226 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2227 return NULL;
2228 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2229 total_cmds);
2230 }
2231 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2232
2233 cls_session = iscsi_alloc_session(shost, iscsit,
2234 sizeof(struct iscsi_session));
2235 if (!cls_session)
2236 goto dec_session_count;
2237 session = cls_session->dd_data;
2238 session->cls_session = cls_session;
2239 session->host = shost;
2240 session->state = ISCSI_STATE_FREE;
2241 session->fast_abort = 1;
2242 session->lu_reset_timeout = 15;
2243 session->abort_timeout = 10;
2244 session->scsi_cmds_max = scsi_cmds;
2245 session->cmds_max = total_cmds;
2246 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2247 session->exp_cmdsn = initial_cmdsn + 1;
2248 session->max_cmdsn = initial_cmdsn + 1;
2249 session->max_r2t = 1;
2250 session->tt = iscsit;
2251 mutex_init(&session->eh_mutex);
2252 spin_lock_init(&session->lock);
2253
2254 /* initialize SCSI PDU commands pool */
2255 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2256 (void***)&session->cmds,
2257 cmd_task_size + sizeof(struct iscsi_task)))
2258 goto cmdpool_alloc_fail;
2259
2260 /* pre-format cmds pool with ITT */
2261 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2262 struct iscsi_task *task = session->cmds[cmd_i];
2263
2264 if (cmd_task_size)
2265 task->dd_data = &task[1];
2266 task->itt = cmd_i;
2267 INIT_LIST_HEAD(&task->running);
2268 }
2269
2270 if (!try_module_get(iscsit->owner))
2271 goto module_get_fail;
2272
2273 if (iscsi_add_session(cls_session, id))
2274 goto cls_session_fail;
2275
2276 return cls_session;
2277
2278 cls_session_fail:
2279 module_put(iscsit->owner);
2280 module_get_fail:
2281 iscsi_pool_free(&session->cmdpool);
2282 cmdpool_alloc_fail:
2283 iscsi_free_session(cls_session);
2284 dec_session_count:
2285 iscsi_host_dec_session_cnt(shost);
2286 return NULL;
2287 }
2288 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2289
2290 /**
2291 * iscsi_session_teardown - destroy session, host, and cls_session
2292 * @cls_session: iscsi session
2293 *
2294 * The driver must have called iscsi_remove_session before
2295 * calling this.
2296 */
2297 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2298 {
2299 struct iscsi_session *session = cls_session->dd_data;
2300 struct module *owner = cls_session->transport->owner;
2301 struct Scsi_Host *shost = session->host;
2302
2303 iscsi_pool_free(&session->cmdpool);
2304
2305 kfree(session->password);
2306 kfree(session->password_in);
2307 kfree(session->username);
2308 kfree(session->username_in);
2309 kfree(session->targetname);
2310 kfree(session->initiatorname);
2311 kfree(session->ifacename);
2312
2313 iscsi_destroy_session(cls_session);
2314 iscsi_host_dec_session_cnt(shost);
2315 module_put(owner);
2316 }
2317 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2318
2319 /**
2320 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2321 * @cls_session: iscsi_cls_session
2322 * @dd_size: private driver data size
2323 * @conn_idx: cid
2324 */
2325 struct iscsi_cls_conn *
2326 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2327 uint32_t conn_idx)
2328 {
2329 struct iscsi_session *session = cls_session->dd_data;
2330 struct iscsi_conn *conn;
2331 struct iscsi_cls_conn *cls_conn;
2332 char *data;
2333
2334 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2335 conn_idx);
2336 if (!cls_conn)
2337 return NULL;
2338 conn = cls_conn->dd_data;
2339 memset(conn, 0, sizeof(*conn) + dd_size);
2340
2341 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2342 conn->session = session;
2343 conn->cls_conn = cls_conn;
2344 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2345 conn->id = conn_idx;
2346 conn->exp_statsn = 0;
2347 conn->tmf_state = TMF_INITIAL;
2348
2349 init_timer(&conn->transport_timer);
2350 conn->transport_timer.data = (unsigned long)conn;
2351 conn->transport_timer.function = iscsi_check_transport_timeouts;
2352
2353 INIT_LIST_HEAD(&conn->run_list);
2354 INIT_LIST_HEAD(&conn->mgmt_run_list);
2355 INIT_LIST_HEAD(&conn->mgmtqueue);
2356 INIT_LIST_HEAD(&conn->xmitqueue);
2357 INIT_LIST_HEAD(&conn->requeue);
2358 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2359
2360 /* allocate login_task used for the login/text sequences */
2361 spin_lock_bh(&session->lock);
2362 if (!__kfifo_get(session->cmdpool.queue,
2363 (void*)&conn->login_task,
2364 sizeof(void*))) {
2365 spin_unlock_bh(&session->lock);
2366 goto login_task_alloc_fail;
2367 }
2368 spin_unlock_bh(&session->lock);
2369
2370 data = (char *) __get_free_pages(GFP_KERNEL,
2371 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2372 if (!data)
2373 goto login_task_data_alloc_fail;
2374 conn->login_task->data = conn->data = data;
2375
2376 init_timer(&conn->tmf_timer);
2377 init_waitqueue_head(&conn->ehwait);
2378
2379 return cls_conn;
2380
2381 login_task_data_alloc_fail:
2382 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2383 sizeof(void*));
2384 login_task_alloc_fail:
2385 iscsi_destroy_conn(cls_conn);
2386 return NULL;
2387 }
2388 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2389
2390 /**
2391 * iscsi_conn_teardown - teardown iscsi connection
2392 * cls_conn: iscsi class connection
2393 *
2394 * TODO: we may need to make this into a two step process
2395 * like scsi-mls remove + put host
2396 */
2397 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2398 {
2399 struct iscsi_conn *conn = cls_conn->dd_data;
2400 struct iscsi_session *session = conn->session;
2401 unsigned long flags;
2402
2403 del_timer_sync(&conn->transport_timer);
2404
2405 spin_lock_bh(&session->lock);
2406 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2407 if (session->leadconn == conn) {
2408 /*
2409 * leading connection? then give up on recovery.
2410 */
2411 session->state = ISCSI_STATE_TERMINATE;
2412 wake_up(&conn->ehwait);
2413 }
2414 spin_unlock_bh(&session->lock);
2415
2416 /*
2417 * Block until all in-progress commands for this connection
2418 * time out or fail.
2419 */
2420 for (;;) {
2421 spin_lock_irqsave(session->host->host_lock, flags);
2422 if (!session->host->host_busy) { /* OK for ERL == 0 */
2423 spin_unlock_irqrestore(session->host->host_lock, flags);
2424 break;
2425 }
2426 spin_unlock_irqrestore(session->host->host_lock, flags);
2427 msleep_interruptible(500);
2428 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2429 "host_busy %d host_failed %d\n",
2430 session->host->host_busy,
2431 session->host->host_failed);
2432 /*
2433 * force eh_abort() to unblock
2434 */
2435 wake_up(&conn->ehwait);
2436 }
2437
2438 /* flush queued up work because we free the connection below */
2439 iscsi_suspend_tx(conn);
2440
2441 spin_lock_bh(&session->lock);
2442 free_pages((unsigned long) conn->data,
2443 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2444 kfree(conn->persistent_address);
2445 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2446 sizeof(void*));
2447 if (session->leadconn == conn)
2448 session->leadconn = NULL;
2449 spin_unlock_bh(&session->lock);
2450
2451 iscsi_destroy_conn(cls_conn);
2452 }
2453 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2454
2455 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2456 {
2457 struct iscsi_conn *conn = cls_conn->dd_data;
2458 struct iscsi_session *session = conn->session;
2459
2460 if (!session) {
2461 iscsi_conn_printk(KERN_ERR, conn,
2462 "can't start unbound connection\n");
2463 return -EPERM;
2464 }
2465
2466 if ((session->imm_data_en || !session->initial_r2t_en) &&
2467 session->first_burst > session->max_burst) {
2468 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2469 "first_burst %d max_burst %d\n",
2470 session->first_burst, session->max_burst);
2471 return -EINVAL;
2472 }
2473
2474 if (conn->ping_timeout && !conn->recv_timeout) {
2475 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2476 "zero. Using 5 seconds\n.");
2477 conn->recv_timeout = 5;
2478 }
2479
2480 if (conn->recv_timeout && !conn->ping_timeout) {
2481 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2482 "zero. Using 5 seconds.\n");
2483 conn->ping_timeout = 5;
2484 }
2485
2486 spin_lock_bh(&session->lock);
2487 conn->c_stage = ISCSI_CONN_STARTED;
2488 session->state = ISCSI_STATE_LOGGED_IN;
2489 session->queued_cmdsn = session->cmdsn;
2490
2491 conn->last_recv = jiffies;
2492 conn->last_ping = jiffies;
2493 if (conn->recv_timeout && conn->ping_timeout)
2494 mod_timer(&conn->transport_timer,
2495 jiffies + (conn->recv_timeout * HZ));
2496
2497 switch(conn->stop_stage) {
2498 case STOP_CONN_RECOVER:
2499 /*
2500 * unblock eh_abort() if it is blocked. re-try all
2501 * commands after successful recovery
2502 */
2503 conn->stop_stage = 0;
2504 conn->tmf_state = TMF_INITIAL;
2505 session->age++;
2506 if (session->age == 16)
2507 session->age = 0;
2508 break;
2509 case STOP_CONN_TERM:
2510 conn->stop_stage = 0;
2511 break;
2512 default:
2513 break;
2514 }
2515 spin_unlock_bh(&session->lock);
2516
2517 iscsi_unblock_session(session->cls_session);
2518 wake_up(&conn->ehwait);
2519 return 0;
2520 }
2521 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2522
2523 static void
2524 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2525 {
2526 struct iscsi_task *task, *tmp;
2527
2528 /* handle pending */
2529 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2530 ISCSI_DBG_SESSION(session, "flushing pending mgmt task "
2531 "itt 0x%x\n", task->itt);
2532 /* release ref from prep task */
2533 __iscsi_put_task(task);
2534 }
2535
2536 /* handle running */
2537 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2538 ISCSI_DBG_SESSION(session, "flushing running mgmt task "
2539 "itt 0x%x\n", task->itt);
2540 /* release ref from prep task */
2541 __iscsi_put_task(task);
2542 }
2543
2544 conn->task = NULL;
2545 }
2546
2547 static void iscsi_start_session_recovery(struct iscsi_session *session,
2548 struct iscsi_conn *conn, int flag)
2549 {
2550 int old_stop_stage;
2551
2552 del_timer_sync(&conn->transport_timer);
2553
2554 mutex_lock(&session->eh_mutex);
2555 spin_lock_bh(&session->lock);
2556 if (conn->stop_stage == STOP_CONN_TERM) {
2557 spin_unlock_bh(&session->lock);
2558 mutex_unlock(&session->eh_mutex);
2559 return;
2560 }
2561
2562 /*
2563 * When this is called for the in_login state, we only want to clean
2564 * up the login task and connection. We do not need to block and set
2565 * the recovery state again
2566 */
2567 if (flag == STOP_CONN_TERM)
2568 session->state = ISCSI_STATE_TERMINATE;
2569 else if (conn->stop_stage != STOP_CONN_RECOVER)
2570 session->state = ISCSI_STATE_IN_RECOVERY;
2571
2572 old_stop_stage = conn->stop_stage;
2573 conn->stop_stage = flag;
2574 conn->c_stage = ISCSI_CONN_STOPPED;
2575 spin_unlock_bh(&session->lock);
2576
2577 iscsi_suspend_tx(conn);
2578 /*
2579 * for connection level recovery we should not calculate
2580 * header digest. conn->hdr_size used for optimization
2581 * in hdr_extract() and will be re-negotiated at
2582 * set_param() time.
2583 */
2584 if (flag == STOP_CONN_RECOVER) {
2585 conn->hdrdgst_en = 0;
2586 conn->datadgst_en = 0;
2587 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2588 old_stop_stage != STOP_CONN_RECOVER) {
2589 ISCSI_DBG_SESSION(session, "blocking session\n");
2590 iscsi_block_session(session->cls_session);
2591 }
2592 }
2593
2594 /*
2595 * flush queues.
2596 */
2597 spin_lock_bh(&session->lock);
2598 if (flag == STOP_CONN_RECOVER)
2599 fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
2600 else
2601 fail_all_commands(conn, -1, DID_ERROR);
2602 flush_control_queues(session, conn);
2603 spin_unlock_bh(&session->lock);
2604 mutex_unlock(&session->eh_mutex);
2605 }
2606
2607 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2608 {
2609 struct iscsi_conn *conn = cls_conn->dd_data;
2610 struct iscsi_session *session = conn->session;
2611
2612 switch (flag) {
2613 case STOP_CONN_RECOVER:
2614 case STOP_CONN_TERM:
2615 iscsi_start_session_recovery(session, conn, flag);
2616 break;
2617 default:
2618 iscsi_conn_printk(KERN_ERR, conn,
2619 "invalid stop flag %d\n", flag);
2620 }
2621 }
2622 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2623
2624 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2625 struct iscsi_cls_conn *cls_conn, int is_leading)
2626 {
2627 struct iscsi_session *session = cls_session->dd_data;
2628 struct iscsi_conn *conn = cls_conn->dd_data;
2629
2630 spin_lock_bh(&session->lock);
2631 if (is_leading)
2632 session->leadconn = conn;
2633 spin_unlock_bh(&session->lock);
2634
2635 /*
2636 * Unblock xmitworker(), Login Phase will pass through.
2637 */
2638 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2639 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2640 return 0;
2641 }
2642 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2643
2644
2645 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2646 enum iscsi_param param, char *buf, int buflen)
2647 {
2648 struct iscsi_conn *conn = cls_conn->dd_data;
2649 struct iscsi_session *session = conn->session;
2650 uint32_t value;
2651
2652 switch(param) {
2653 case ISCSI_PARAM_FAST_ABORT:
2654 sscanf(buf, "%d", &session->fast_abort);
2655 break;
2656 case ISCSI_PARAM_ABORT_TMO:
2657 sscanf(buf, "%d", &session->abort_timeout);
2658 break;
2659 case ISCSI_PARAM_LU_RESET_TMO:
2660 sscanf(buf, "%d", &session->lu_reset_timeout);
2661 break;
2662 case ISCSI_PARAM_PING_TMO:
2663 sscanf(buf, "%d", &conn->ping_timeout);
2664 break;
2665 case ISCSI_PARAM_RECV_TMO:
2666 sscanf(buf, "%d", &conn->recv_timeout);
2667 break;
2668 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2669 sscanf(buf, "%d", &conn->max_recv_dlength);
2670 break;
2671 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2672 sscanf(buf, "%d", &conn->max_xmit_dlength);
2673 break;
2674 case ISCSI_PARAM_HDRDGST_EN:
2675 sscanf(buf, "%d", &conn->hdrdgst_en);
2676 break;
2677 case ISCSI_PARAM_DATADGST_EN:
2678 sscanf(buf, "%d", &conn->datadgst_en);
2679 break;
2680 case ISCSI_PARAM_INITIAL_R2T_EN:
2681 sscanf(buf, "%d", &session->initial_r2t_en);
2682 break;
2683 case ISCSI_PARAM_MAX_R2T:
2684 sscanf(buf, "%d", &session->max_r2t);
2685 break;
2686 case ISCSI_PARAM_IMM_DATA_EN:
2687 sscanf(buf, "%d", &session->imm_data_en);
2688 break;
2689 case ISCSI_PARAM_FIRST_BURST:
2690 sscanf(buf, "%d", &session->first_burst);
2691 break;
2692 case ISCSI_PARAM_MAX_BURST:
2693 sscanf(buf, "%d", &session->max_burst);
2694 break;
2695 case ISCSI_PARAM_PDU_INORDER_EN:
2696 sscanf(buf, "%d", &session->pdu_inorder_en);
2697 break;
2698 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2699 sscanf(buf, "%d", &session->dataseq_inorder_en);
2700 break;
2701 case ISCSI_PARAM_ERL:
2702 sscanf(buf, "%d", &session->erl);
2703 break;
2704 case ISCSI_PARAM_IFMARKER_EN:
2705 sscanf(buf, "%d", &value);
2706 BUG_ON(value);
2707 break;
2708 case ISCSI_PARAM_OFMARKER_EN:
2709 sscanf(buf, "%d", &value);
2710 BUG_ON(value);
2711 break;
2712 case ISCSI_PARAM_EXP_STATSN:
2713 sscanf(buf, "%u", &conn->exp_statsn);
2714 break;
2715 case ISCSI_PARAM_USERNAME:
2716 kfree(session->username);
2717 session->username = kstrdup(buf, GFP_KERNEL);
2718 if (!session->username)
2719 return -ENOMEM;
2720 break;
2721 case ISCSI_PARAM_USERNAME_IN:
2722 kfree(session->username_in);
2723 session->username_in = kstrdup(buf, GFP_KERNEL);
2724 if (!session->username_in)
2725 return -ENOMEM;
2726 break;
2727 case ISCSI_PARAM_PASSWORD:
2728 kfree(session->password);
2729 session->password = kstrdup(buf, GFP_KERNEL);
2730 if (!session->password)
2731 return -ENOMEM;
2732 break;
2733 case ISCSI_PARAM_PASSWORD_IN:
2734 kfree(session->password_in);
2735 session->password_in = kstrdup(buf, GFP_KERNEL);
2736 if (!session->password_in)
2737 return -ENOMEM;
2738 break;
2739 case ISCSI_PARAM_TARGET_NAME:
2740 /* this should not change between logins */
2741 if (session->targetname)
2742 break;
2743
2744 session->targetname = kstrdup(buf, GFP_KERNEL);
2745 if (!session->targetname)
2746 return -ENOMEM;
2747 break;
2748 case ISCSI_PARAM_TPGT:
2749 sscanf(buf, "%d", &session->tpgt);
2750 break;
2751 case ISCSI_PARAM_PERSISTENT_PORT:
2752 sscanf(buf, "%d", &conn->persistent_port);
2753 break;
2754 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2755 /*
2756 * this is the address returned in discovery so it should
2757 * not change between logins.
2758 */
2759 if (conn->persistent_address)
2760 break;
2761
2762 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2763 if (!conn->persistent_address)
2764 return -ENOMEM;
2765 break;
2766 case ISCSI_PARAM_IFACE_NAME:
2767 if (!session->ifacename)
2768 session->ifacename = kstrdup(buf, GFP_KERNEL);
2769 break;
2770 case ISCSI_PARAM_INITIATOR_NAME:
2771 if (!session->initiatorname)
2772 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2773 break;
2774 default:
2775 return -ENOSYS;
2776 }
2777
2778 return 0;
2779 }
2780 EXPORT_SYMBOL_GPL(iscsi_set_param);
2781
2782 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2783 enum iscsi_param param, char *buf)
2784 {
2785 struct iscsi_session *session = cls_session->dd_data;
2786 int len;
2787
2788 switch(param) {
2789 case ISCSI_PARAM_FAST_ABORT:
2790 len = sprintf(buf, "%d\n", session->fast_abort);
2791 break;
2792 case ISCSI_PARAM_ABORT_TMO:
2793 len = sprintf(buf, "%d\n", session->abort_timeout);
2794 break;
2795 case ISCSI_PARAM_LU_RESET_TMO:
2796 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2797 break;
2798 case ISCSI_PARAM_INITIAL_R2T_EN:
2799 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2800 break;
2801 case ISCSI_PARAM_MAX_R2T:
2802 len = sprintf(buf, "%hu\n", session->max_r2t);
2803 break;
2804 case ISCSI_PARAM_IMM_DATA_EN:
2805 len = sprintf(buf, "%d\n", session->imm_data_en);
2806 break;
2807 case ISCSI_PARAM_FIRST_BURST:
2808 len = sprintf(buf, "%u\n", session->first_burst);
2809 break;
2810 case ISCSI_PARAM_MAX_BURST:
2811 len = sprintf(buf, "%u\n", session->max_burst);
2812 break;
2813 case ISCSI_PARAM_PDU_INORDER_EN:
2814 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2815 break;
2816 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2817 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2818 break;
2819 case ISCSI_PARAM_ERL:
2820 len = sprintf(buf, "%d\n", session->erl);
2821 break;
2822 case ISCSI_PARAM_TARGET_NAME:
2823 len = sprintf(buf, "%s\n", session->targetname);
2824 break;
2825 case ISCSI_PARAM_TPGT:
2826 len = sprintf(buf, "%d\n", session->tpgt);
2827 break;
2828 case ISCSI_PARAM_USERNAME:
2829 len = sprintf(buf, "%s\n", session->username);
2830 break;
2831 case ISCSI_PARAM_USERNAME_IN:
2832 len = sprintf(buf, "%s\n", session->username_in);
2833 break;
2834 case ISCSI_PARAM_PASSWORD:
2835 len = sprintf(buf, "%s\n", session->password);
2836 break;
2837 case ISCSI_PARAM_PASSWORD_IN:
2838 len = sprintf(buf, "%s\n", session->password_in);
2839 break;
2840 case ISCSI_PARAM_IFACE_NAME:
2841 len = sprintf(buf, "%s\n", session->ifacename);
2842 break;
2843 case ISCSI_PARAM_INITIATOR_NAME:
2844 if (!session->initiatorname)
2845 len = sprintf(buf, "%s\n", "unknown");
2846 else
2847 len = sprintf(buf, "%s\n", session->initiatorname);
2848 break;
2849 default:
2850 return -ENOSYS;
2851 }
2852
2853 return len;
2854 }
2855 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2856
2857 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2858 enum iscsi_param param, char *buf)
2859 {
2860 struct iscsi_conn *conn = cls_conn->dd_data;
2861 int len;
2862
2863 switch(param) {
2864 case ISCSI_PARAM_PING_TMO:
2865 len = sprintf(buf, "%u\n", conn->ping_timeout);
2866 break;
2867 case ISCSI_PARAM_RECV_TMO:
2868 len = sprintf(buf, "%u\n", conn->recv_timeout);
2869 break;
2870 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2871 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2872 break;
2873 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2874 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2875 break;
2876 case ISCSI_PARAM_HDRDGST_EN:
2877 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2878 break;
2879 case ISCSI_PARAM_DATADGST_EN:
2880 len = sprintf(buf, "%d\n", conn->datadgst_en);
2881 break;
2882 case ISCSI_PARAM_IFMARKER_EN:
2883 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2884 break;
2885 case ISCSI_PARAM_OFMARKER_EN:
2886 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2887 break;
2888 case ISCSI_PARAM_EXP_STATSN:
2889 len = sprintf(buf, "%u\n", conn->exp_statsn);
2890 break;
2891 case ISCSI_PARAM_PERSISTENT_PORT:
2892 len = sprintf(buf, "%d\n", conn->persistent_port);
2893 break;
2894 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2895 len = sprintf(buf, "%s\n", conn->persistent_address);
2896 break;
2897 default:
2898 return -ENOSYS;
2899 }
2900
2901 return len;
2902 }
2903 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2904
2905 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2906 char *buf)
2907 {
2908 struct iscsi_host *ihost = shost_priv(shost);
2909 int len;
2910
2911 switch (param) {
2912 case ISCSI_HOST_PARAM_NETDEV_NAME:
2913 if (!ihost->netdev)
2914 len = sprintf(buf, "%s\n", "default");
2915 else
2916 len = sprintf(buf, "%s\n", ihost->netdev);
2917 break;
2918 case ISCSI_HOST_PARAM_HWADDRESS:
2919 if (!ihost->hwaddress)
2920 len = sprintf(buf, "%s\n", "default");
2921 else
2922 len = sprintf(buf, "%s\n", ihost->hwaddress);
2923 break;
2924 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2925 if (!ihost->initiatorname)
2926 len = sprintf(buf, "%s\n", "unknown");
2927 else
2928 len = sprintf(buf, "%s\n", ihost->initiatorname);
2929 break;
2930 case ISCSI_HOST_PARAM_IPADDRESS:
2931 if (!strlen(ihost->local_address))
2932 len = sprintf(buf, "%s\n", "unknown");
2933 else
2934 len = sprintf(buf, "%s\n",
2935 ihost->local_address);
2936 break;
2937 default:
2938 return -ENOSYS;
2939 }
2940
2941 return len;
2942 }
2943 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2944
2945 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2946 char *buf, int buflen)
2947 {
2948 struct iscsi_host *ihost = shost_priv(shost);
2949
2950 switch (param) {
2951 case ISCSI_HOST_PARAM_NETDEV_NAME:
2952 if (!ihost->netdev)
2953 ihost->netdev = kstrdup(buf, GFP_KERNEL);
2954 break;
2955 case ISCSI_HOST_PARAM_HWADDRESS:
2956 if (!ihost->hwaddress)
2957 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
2958 break;
2959 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2960 if (!ihost->initiatorname)
2961 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
2962 break;
2963 default:
2964 return -ENOSYS;
2965 }
2966
2967 return 0;
2968 }
2969 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2970
2971 MODULE_AUTHOR("Mike Christie");
2972 MODULE_DESCRIPTION("iSCSI library functions");
2973 MODULE_LICENSE("GPL");
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