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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / drivers / scsi / libiscsi.c
blobe72b4ad47d35bd6ff3855ec038eed77b15c1719d
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 int iscsi_target_alloc(struct scsi_target *starget)
1467 {
1468 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1469 struct iscsi_session *session = cls_session->dd_data;
1470
1471 starget->can_queue = session->scsi_cmds_max;
1472 return 0;
1473 }
1474 EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1475
1476 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1477 {
1478 struct iscsi_session *session = cls_session->dd_data;
1479
1480 spin_lock_bh(&session->lock);
1481 if (session->state != ISCSI_STATE_LOGGED_IN) {
1482 session->state = ISCSI_STATE_RECOVERY_FAILED;
1483 if (session->leadconn)
1484 wake_up(&session->leadconn->ehwait);
1485 }
1486 spin_unlock_bh(&session->lock);
1487 }
1488 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1489
1490 int iscsi_eh_target_reset(struct scsi_cmnd *sc)
1491 {
1492 struct iscsi_cls_session *cls_session;
1493 struct iscsi_session *session;
1494 struct iscsi_conn *conn;
1495
1496 cls_session = starget_to_session(scsi_target(sc->device));
1497 session = cls_session->dd_data;
1498 conn = session->leadconn;
1499
1500 mutex_lock(&session->eh_mutex);
1501 spin_lock_bh(&session->lock);
1502 if (session->state == ISCSI_STATE_TERMINATE) {
1503 failed:
1504 iscsi_session_printk(KERN_INFO, session,
1505 "failing target reset: Could not log "
1506 "back into target [age %d]\n",
1507 session->age);
1508 spin_unlock_bh(&session->lock);
1509 mutex_unlock(&session->eh_mutex);
1510 return FAILED;
1511 }
1512
1513 spin_unlock_bh(&session->lock);
1514 mutex_unlock(&session->eh_mutex);
1515 /*
1516 * we drop the lock here but the leadconn cannot be destoyed while
1517 * we are in the scsi eh
1518 */
1519 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1520
1521 ISCSI_DBG_SESSION(session, "wait for relogin\n");
1522 wait_event_interruptible(conn->ehwait,
1523 session->state == ISCSI_STATE_TERMINATE ||
1524 session->state == ISCSI_STATE_LOGGED_IN ||
1525 session->state == ISCSI_STATE_RECOVERY_FAILED);
1526 if (signal_pending(current))
1527 flush_signals(current);
1528
1529 mutex_lock(&session->eh_mutex);
1530 spin_lock_bh(&session->lock);
1531 if (session->state == ISCSI_STATE_LOGGED_IN)
1532 iscsi_session_printk(KERN_INFO, session,
1533 "target reset succeeded\n");
1534 else
1535 goto failed;
1536 spin_unlock_bh(&session->lock);
1537 mutex_unlock(&session->eh_mutex);
1538 return SUCCESS;
1539 }
1540 EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
1541
1542 static void iscsi_tmf_timedout(unsigned long data)
1543 {
1544 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1545 struct iscsi_session *session = conn->session;
1546
1547 spin_lock(&session->lock);
1548 if (conn->tmf_state == TMF_QUEUED) {
1549 conn->tmf_state = TMF_TIMEDOUT;
1550 ISCSI_DBG_SESSION(session, "tmf timedout\n");
1551 /* unblock eh_abort() */
1552 wake_up(&conn->ehwait);
1553 }
1554 spin_unlock(&session->lock);
1555 }
1556
1557 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1558 struct iscsi_tm *hdr, int age,
1559 int timeout)
1560 {
1561 struct iscsi_session *session = conn->session;
1562 struct iscsi_task *task;
1563
1564 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1565 NULL, 0);
1566 if (!task) {
1567 spin_unlock_bh(&session->lock);
1568 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1569 spin_lock_bh(&session->lock);
1570 ISCSI_DBG_SESSION(session, "tmf exec failure\n");
1571 return -EPERM;
1572 }
1573 conn->tmfcmd_pdus_cnt++;
1574 conn->tmf_timer.expires = timeout * HZ + jiffies;
1575 conn->tmf_timer.function = iscsi_tmf_timedout;
1576 conn->tmf_timer.data = (unsigned long)conn;
1577 add_timer(&conn->tmf_timer);
1578 ISCSI_DBG_SESSION(session, "tmf set timeout\n");
1579
1580 spin_unlock_bh(&session->lock);
1581 mutex_unlock(&session->eh_mutex);
1582
1583 /*
1584 * block eh thread until:
1585 *
1586 * 1) tmf response
1587 * 2) tmf timeout
1588 * 3) session is terminated or restarted or userspace has
1589 * given up on recovery
1590 */
1591 wait_event_interruptible(conn->ehwait, age != session->age ||
1592 session->state != ISCSI_STATE_LOGGED_IN ||
1593 conn->tmf_state != TMF_QUEUED);
1594 if (signal_pending(current))
1595 flush_signals(current);
1596 del_timer_sync(&conn->tmf_timer);
1597
1598 mutex_lock(&session->eh_mutex);
1599 spin_lock_bh(&session->lock);
1600 /* if the session drops it will clean up the task */
1601 if (age != session->age ||
1602 session->state != ISCSI_STATE_LOGGED_IN)
1603 return -ENOTCONN;
1604 return 0;
1605 }
1606
1607 /*
1608 * Fail commands. session lock held and recv side suspended and xmit
1609 * thread flushed
1610 */
1611 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1612 int error)
1613 {
1614 struct iscsi_task *task, *tmp;
1615
1616 if (conn->task) {
1617 if (lun == -1 ||
1618 (conn->task->sc && conn->task->sc->device->lun == lun))
1619 conn->task = NULL;
1620 }
1621
1622 /* flush pending */
1623 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1624 if (lun == task->sc->device->lun || lun == -1) {
1625 ISCSI_DBG_SESSION(conn->session,
1626 "failing pending sc %p itt 0x%x\n",
1627 task->sc, task->itt);
1628 fail_command(conn, task, error << 16);
1629 }
1630 }
1631
1632 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1633 if (lun == task->sc->device->lun || lun == -1) {
1634 ISCSI_DBG_SESSION(conn->session,
1635 "failing requeued sc %p itt 0x%x\n",
1636 task->sc, task->itt);
1637 fail_command(conn, task, error << 16);
1638 }
1639 }
1640
1641 /* fail all other running */
1642 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1643 if (lun == task->sc->device->lun || lun == -1) {
1644 ISCSI_DBG_SESSION(conn->session,
1645 "failing in progress sc %p itt 0x%x\n",
1646 task->sc, task->itt);
1647 fail_command(conn, task, error << 16);
1648 }
1649 }
1650 }
1651
1652 void iscsi_suspend_tx(struct iscsi_conn *conn)
1653 {
1654 struct Scsi_Host *shost = conn->session->host;
1655 struct iscsi_host *ihost = shost_priv(shost);
1656
1657 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1658 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1659 flush_workqueue(ihost->workq);
1660 }
1661 EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1662
1663 static void iscsi_start_tx(struct iscsi_conn *conn)
1664 {
1665 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1666 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1667 iscsi_conn_queue_work(conn);
1668 }
1669
1670 static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1671 {
1672 struct iscsi_cls_session *cls_session;
1673 struct iscsi_session *session;
1674 struct iscsi_conn *conn;
1675 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1676
1677 cls_session = starget_to_session(scsi_target(scmd->device));
1678 session = cls_session->dd_data;
1679
1680 ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd);
1681
1682 spin_lock(&session->lock);
1683 if (session->state != ISCSI_STATE_LOGGED_IN) {
1684 /*
1685 * We are probably in the middle of iscsi recovery so let
1686 * that complete and handle the error.
1687 */
1688 rc = BLK_EH_RESET_TIMER;
1689 goto done;
1690 }
1691
1692 conn = session->leadconn;
1693 if (!conn) {
1694 /* In the middle of shuting down */
1695 rc = BLK_EH_RESET_TIMER;
1696 goto done;
1697 }
1698
1699 if (!conn->recv_timeout && !conn->ping_timeout)
1700 goto done;
1701 /*
1702 * if the ping timedout then we are in the middle of cleaning up
1703 * and can let the iscsi eh handle it
1704 */
1705 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1706 (conn->ping_timeout * HZ), jiffies))
1707 rc = BLK_EH_RESET_TIMER;
1708 /*
1709 * if we are about to check the transport then give the command
1710 * more time
1711 */
1712 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1713 jiffies))
1714 rc = BLK_EH_RESET_TIMER;
1715 /* if in the middle of checking the transport then give us more time */
1716 if (conn->ping_task)
1717 rc = BLK_EH_RESET_TIMER;
1718 done:
1719 spin_unlock(&session->lock);
1720 ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
1721 "timer reset" : "nh");
1722 return rc;
1723 }
1724
1725 static void iscsi_check_transport_timeouts(unsigned long data)
1726 {
1727 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1728 struct iscsi_session *session = conn->session;
1729 unsigned long recv_timeout, next_timeout = 0, last_recv;
1730
1731 spin_lock(&session->lock);
1732 if (session->state != ISCSI_STATE_LOGGED_IN)
1733 goto done;
1734
1735 recv_timeout = conn->recv_timeout;
1736 if (!recv_timeout)
1737 goto done;
1738
1739 recv_timeout *= HZ;
1740 last_recv = conn->last_recv;
1741 if (conn->ping_task &&
1742 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
1743 jiffies)) {
1744 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1745 "expired, last rx %lu, last ping %lu, "
1746 "now %lu\n", conn->ping_timeout, last_recv,
1747 conn->last_ping, jiffies);
1748 spin_unlock(&session->lock);
1749 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1750 return;
1751 }
1752
1753 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
1754 /* send a ping to try to provoke some traffic */
1755 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
1756 iscsi_send_nopout(conn, NULL);
1757 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
1758 } else
1759 next_timeout = last_recv + recv_timeout;
1760
1761 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
1762 mod_timer(&conn->transport_timer, next_timeout);
1763 done:
1764 spin_unlock(&session->lock);
1765 }
1766
1767 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
1768 struct iscsi_tm *hdr)
1769 {
1770 memset(hdr, 0, sizeof(*hdr));
1771 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1772 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1773 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1774 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
1775 hdr->rtt = task->hdr_itt;
1776 hdr->refcmdsn = task->cmdsn;
1777 }
1778
1779 int iscsi_eh_abort(struct scsi_cmnd *sc)
1780 {
1781 struct iscsi_cls_session *cls_session;
1782 struct iscsi_session *session;
1783 struct iscsi_conn *conn;
1784 struct iscsi_task *task;
1785 struct iscsi_tm *hdr;
1786 int rc, age;
1787
1788 cls_session = starget_to_session(scsi_target(sc->device));
1789 session = cls_session->dd_data;
1790
1791 mutex_lock(&session->eh_mutex);
1792 spin_lock_bh(&session->lock);
1793 /*
1794 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1795 * got the command.
1796 */
1797 if (!sc->SCp.ptr) {
1798 ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or "
1799 "it completed.\n");
1800 spin_unlock_bh(&session->lock);
1801 mutex_unlock(&session->eh_mutex);
1802 return SUCCESS;
1803 }
1804
1805 /*
1806 * If we are not logged in or we have started a new session
1807 * then let the host reset code handle this
1808 */
1809 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1810 sc->SCp.phase != session->age) {
1811 spin_unlock_bh(&session->lock);
1812 mutex_unlock(&session->eh_mutex);
1813 return FAILED;
1814 }
1815
1816 conn = session->leadconn;
1817 conn->eh_abort_cnt++;
1818 age = session->age;
1819
1820 task = (struct iscsi_task *)sc->SCp.ptr;
1821 ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n",
1822 sc, task->itt);
1823
1824 /* task completed before time out */
1825 if (!task->sc) {
1826 ISCSI_DBG_SESSION(session, "sc completed while abort in "
1827 "progress\n");
1828 goto success;
1829 }
1830
1831 if (task->state == ISCSI_TASK_PENDING) {
1832 fail_command(conn, task, DID_ABORT << 16);
1833 goto success;
1834 }
1835
1836 /* only have one tmf outstanding at a time */
1837 if (conn->tmf_state != TMF_INITIAL)
1838 goto failed;
1839 conn->tmf_state = TMF_QUEUED;
1840
1841 hdr = &conn->tmhdr;
1842 iscsi_prep_abort_task_pdu(task, hdr);
1843
1844 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1845 rc = FAILED;
1846 goto failed;
1847 }
1848
1849 switch (conn->tmf_state) {
1850 case TMF_SUCCESS:
1851 spin_unlock_bh(&session->lock);
1852 /*
1853 * stop tx side incase the target had sent a abort rsp but
1854 * the initiator was still writing out data.
1855 */
1856 iscsi_suspend_tx(conn);
1857 /*
1858 * we do not stop the recv side because targets have been
1859 * good and have never sent us a successful tmf response
1860 * then sent more data for the cmd.
1861 */
1862 spin_lock(&session->lock);
1863 fail_command(conn, task, DID_ABORT << 16);
1864 conn->tmf_state = TMF_INITIAL;
1865 spin_unlock(&session->lock);
1866 iscsi_start_tx(conn);
1867 goto success_unlocked;
1868 case TMF_TIMEDOUT:
1869 spin_unlock_bh(&session->lock);
1870 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1871 goto failed_unlocked;
1872 case TMF_NOT_FOUND:
1873 if (!sc->SCp.ptr) {
1874 conn->tmf_state = TMF_INITIAL;
1875 /* task completed before tmf abort response */
1876 ISCSI_DBG_SESSION(session, "sc completed while abort "
1877 "in progress\n");
1878 goto success;
1879 }
1880 /* fall through */
1881 default:
1882 conn->tmf_state = TMF_INITIAL;
1883 goto failed;
1884 }
1885
1886 success:
1887 spin_unlock_bh(&session->lock);
1888 success_unlocked:
1889 ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n",
1890 sc, task->itt);
1891 mutex_unlock(&session->eh_mutex);
1892 return SUCCESS;
1893
1894 failed:
1895 spin_unlock_bh(&session->lock);
1896 failed_unlocked:
1897 ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc,
1898 task ? task->itt : 0);
1899 mutex_unlock(&session->eh_mutex);
1900 return FAILED;
1901 }
1902 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1903
1904 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1905 {
1906 memset(hdr, 0, sizeof(*hdr));
1907 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1908 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1909 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1910 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1911 hdr->rtt = RESERVED_ITT;
1912 }
1913
1914 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1915 {
1916 struct iscsi_cls_session *cls_session;
1917 struct iscsi_session *session;
1918 struct iscsi_conn *conn;
1919 struct iscsi_tm *hdr;
1920 int rc = FAILED;
1921
1922 cls_session = starget_to_session(scsi_target(sc->device));
1923 session = cls_session->dd_data;
1924
1925 ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n",
1926 sc, sc->device->lun);
1927
1928 mutex_lock(&session->eh_mutex);
1929 spin_lock_bh(&session->lock);
1930 /*
1931 * Just check if we are not logged in. We cannot check for
1932 * the phase because the reset could come from a ioctl.
1933 */
1934 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1935 goto unlock;
1936 conn = session->leadconn;
1937
1938 /* only have one tmf outstanding at a time */
1939 if (conn->tmf_state != TMF_INITIAL)
1940 goto unlock;
1941 conn->tmf_state = TMF_QUEUED;
1942
1943 hdr = &conn->tmhdr;
1944 iscsi_prep_lun_reset_pdu(sc, hdr);
1945
1946 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1947 session->lu_reset_timeout)) {
1948 rc = FAILED;
1949 goto unlock;
1950 }
1951
1952 switch (conn->tmf_state) {
1953 case TMF_SUCCESS:
1954 break;
1955 case TMF_TIMEDOUT:
1956 spin_unlock_bh(&session->lock);
1957 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1958 goto done;
1959 default:
1960 conn->tmf_state = TMF_INITIAL;
1961 goto unlock;
1962 }
1963
1964 rc = SUCCESS;
1965 spin_unlock_bh(&session->lock);
1966
1967 iscsi_suspend_tx(conn);
1968
1969 spin_lock_bh(&session->lock);
1970 fail_all_commands(conn, sc->device->lun, DID_ERROR);
1971 conn->tmf_state = TMF_INITIAL;
1972 spin_unlock_bh(&session->lock);
1973
1974 iscsi_start_tx(conn);
1975 goto done;
1976
1977 unlock:
1978 spin_unlock_bh(&session->lock);
1979 done:
1980 ISCSI_DBG_SESSION(session, "dev reset result = %s\n",
1981 rc == SUCCESS ? "SUCCESS" : "FAILED");
1982 mutex_unlock(&session->eh_mutex);
1983 return rc;
1984 }
1985 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1986
1987 /*
1988 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1989 * should be accessed via kfifo_{get,put} on q->queue.
1990 * Optionally, the caller can obtain the array of object pointers
1991 * by passing in a non-NULL @items pointer
1992 */
1993 int
1994 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1995 {
1996 int i, num_arrays = 1;
1997
1998 memset(q, 0, sizeof(*q));
1999
2000 q->max = max;
2001
2002 /* If the user passed an items pointer, he wants a copy of
2003 * the array. */
2004 if (items)
2005 num_arrays++;
2006 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2007 if (q->pool == NULL)
2008 return -ENOMEM;
2009
2010 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2011 GFP_KERNEL, NULL);
2012 if (IS_ERR(q->queue)) {
2013 q->queue = NULL;
2014 goto enomem;
2015 }
2016
2017 for (i = 0; i < max; i++) {
2018 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2019 if (q->pool[i] == NULL) {
2020 q->max = i;
2021 goto enomem;
2022 }
2023 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2024 }
2025
2026 if (items) {
2027 *items = q->pool + max;
2028 memcpy(*items, q->pool, max * sizeof(void *));
2029 }
2030
2031 return 0;
2032
2033 enomem:
2034 iscsi_pool_free(q);
2035 return -ENOMEM;
2036 }
2037 EXPORT_SYMBOL_GPL(iscsi_pool_init);
2038
2039 void iscsi_pool_free(struct iscsi_pool *q)
2040 {
2041 int i;
2042
2043 for (i = 0; i < q->max; i++)
2044 kfree(q->pool[i]);
2045 kfree(q->pool);
2046 kfree(q->queue);
2047 }
2048 EXPORT_SYMBOL_GPL(iscsi_pool_free);
2049
2050 /**
2051 * iscsi_host_add - add host to system
2052 * @shost: scsi host
2053 * @pdev: parent device
2054 *
2055 * This should be called by partial offload and software iscsi drivers
2056 * to add a host to the system.
2057 */
2058 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2059 {
2060 if (!shost->can_queue)
2061 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2062
2063 if (!shost->cmd_per_lun)
2064 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2065
2066 if (!shost->transportt->eh_timed_out)
2067 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2068 return scsi_add_host(shost, pdev);
2069 }
2070 EXPORT_SYMBOL_GPL(iscsi_host_add);
2071
2072 /**
2073 * iscsi_host_alloc - allocate a host and driver data
2074 * @sht: scsi host template
2075 * @dd_data_size: driver host data size
2076 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2077 *
2078 * This should be called by partial offload and software iscsi drivers.
2079 * To access the driver specific memory use the iscsi_host_priv() macro.
2080 */
2081 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2082 int dd_data_size, bool xmit_can_sleep)
2083 {
2084 struct Scsi_Host *shost;
2085 struct iscsi_host *ihost;
2086
2087 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2088 if (!shost)
2089 return NULL;
2090 ihost = shost_priv(shost);
2091
2092 if (xmit_can_sleep) {
2093 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2094 "iscsi_q_%d", shost->host_no);
2095 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2096 if (!ihost->workq)
2097 goto free_host;
2098 }
2099
2100 spin_lock_init(&ihost->lock);
2101 ihost->state = ISCSI_HOST_SETUP;
2102 ihost->num_sessions = 0;
2103 init_waitqueue_head(&ihost->session_removal_wq);
2104 return shost;
2105
2106 free_host:
2107 scsi_host_put(shost);
2108 return NULL;
2109 }
2110 EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2111
2112 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2113 {
2114 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2115 }
2116
2117 /**
2118 * iscsi_host_remove - remove host and sessions
2119 * @shost: scsi host
2120 *
2121 * If there are any sessions left, this will initiate the removal and wait
2122 * for the completion.
2123 */
2124 void iscsi_host_remove(struct Scsi_Host *shost)
2125 {
2126 struct iscsi_host *ihost = shost_priv(shost);
2127 unsigned long flags;
2128
2129 spin_lock_irqsave(&ihost->lock, flags);
2130 ihost->state = ISCSI_HOST_REMOVED;
2131 spin_unlock_irqrestore(&ihost->lock, flags);
2132
2133 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2134 wait_event_interruptible(ihost->session_removal_wq,
2135 ihost->num_sessions == 0);
2136 if (signal_pending(current))
2137 flush_signals(current);
2138
2139 scsi_remove_host(shost);
2140 if (ihost->workq)
2141 destroy_workqueue(ihost->workq);
2142 }
2143 EXPORT_SYMBOL_GPL(iscsi_host_remove);
2144
2145 void iscsi_host_free(struct Scsi_Host *shost)
2146 {
2147 struct iscsi_host *ihost = shost_priv(shost);
2148
2149 kfree(ihost->netdev);
2150 kfree(ihost->hwaddress);
2151 kfree(ihost->initiatorname);
2152 scsi_host_put(shost);
2153 }
2154 EXPORT_SYMBOL_GPL(iscsi_host_free);
2155
2156 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2157 {
2158 struct iscsi_host *ihost = shost_priv(shost);
2159 unsigned long flags;
2160
2161 shost = scsi_host_get(shost);
2162 if (!shost) {
2163 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2164 "of session teardown event because host already "
2165 "removed.\n");
2166 return;
2167 }
2168
2169 spin_lock_irqsave(&ihost->lock, flags);
2170 ihost->num_sessions--;
2171 if (ihost->num_sessions == 0)
2172 wake_up(&ihost->session_removal_wq);
2173 spin_unlock_irqrestore(&ihost->lock, flags);
2174 scsi_host_put(shost);
2175 }
2176
2177 /**
2178 * iscsi_session_setup - create iscsi cls session and host and session
2179 * @iscsit: iscsi transport template
2180 * @shost: scsi host
2181 * @cmds_max: session can queue
2182 * @cmd_task_size: LLD task private data size
2183 * @initial_cmdsn: initial CmdSN
2184 *
2185 * This can be used by software iscsi_transports that allocate
2186 * a session per scsi host.
2187 *
2188 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2189 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2190 * for nop handling and login/logout requests.
2191 */
2192 struct iscsi_cls_session *
2193 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2194 uint16_t cmds_max, int cmd_task_size,
2195 uint32_t initial_cmdsn, unsigned int id)
2196 {
2197 struct iscsi_host *ihost = shost_priv(shost);
2198 struct iscsi_session *session;
2199 struct iscsi_cls_session *cls_session;
2200 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2201 unsigned long flags;
2202
2203 spin_lock_irqsave(&ihost->lock, flags);
2204 if (ihost->state == ISCSI_HOST_REMOVED) {
2205 spin_unlock_irqrestore(&ihost->lock, flags);
2206 return NULL;
2207 }
2208 ihost->num_sessions++;
2209 spin_unlock_irqrestore(&ihost->lock, flags);
2210
2211 if (!total_cmds)
2212 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2213 /*
2214 * The iscsi layer needs some tasks for nop handling and tmfs,
2215 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2216 * + 1 command for scsi IO.
2217 */
2218 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2219 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2220 "must be a power of two that is at least %d.\n",
2221 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2222 goto dec_session_count;
2223 }
2224
2225 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2226 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2227 "must be a power of 2 less than or equal to %d.\n",
2228 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2229 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2230 }
2231
2232 if (!is_power_of_2(total_cmds)) {
2233 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2234 "must be a power of 2.\n", total_cmds);
2235 total_cmds = rounddown_pow_of_two(total_cmds);
2236 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2237 return NULL;
2238 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2239 total_cmds);
2240 }
2241 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2242
2243 cls_session = iscsi_alloc_session(shost, iscsit,
2244 sizeof(struct iscsi_session));
2245 if (!cls_session)
2246 goto dec_session_count;
2247 session = cls_session->dd_data;
2248 session->cls_session = cls_session;
2249 session->host = shost;
2250 session->state = ISCSI_STATE_FREE;
2251 session->fast_abort = 1;
2252 session->lu_reset_timeout = 15;
2253 session->abort_timeout = 10;
2254 session->scsi_cmds_max = scsi_cmds;
2255 session->cmds_max = total_cmds;
2256 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2257 session->exp_cmdsn = initial_cmdsn + 1;
2258 session->max_cmdsn = initial_cmdsn + 1;
2259 session->max_r2t = 1;
2260 session->tt = iscsit;
2261 mutex_init(&session->eh_mutex);
2262 spin_lock_init(&session->lock);
2263
2264 /* initialize SCSI PDU commands pool */
2265 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2266 (void***)&session->cmds,
2267 cmd_task_size + sizeof(struct iscsi_task)))
2268 goto cmdpool_alloc_fail;
2269
2270 /* pre-format cmds pool with ITT */
2271 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2272 struct iscsi_task *task = session->cmds[cmd_i];
2273
2274 if (cmd_task_size)
2275 task->dd_data = &task[1];
2276 task->itt = cmd_i;
2277 INIT_LIST_HEAD(&task->running);
2278 }
2279
2280 if (!try_module_get(iscsit->owner))
2281 goto module_get_fail;
2282
2283 if (iscsi_add_session(cls_session, id))
2284 goto cls_session_fail;
2285
2286 return cls_session;
2287
2288 cls_session_fail:
2289 module_put(iscsit->owner);
2290 module_get_fail:
2291 iscsi_pool_free(&session->cmdpool);
2292 cmdpool_alloc_fail:
2293 iscsi_free_session(cls_session);
2294 dec_session_count:
2295 iscsi_host_dec_session_cnt(shost);
2296 return NULL;
2297 }
2298 EXPORT_SYMBOL_GPL(iscsi_session_setup);
2299
2300 /**
2301 * iscsi_session_teardown - destroy session, host, and cls_session
2302 * @cls_session: iscsi session
2303 *
2304 * The driver must have called iscsi_remove_session before
2305 * calling this.
2306 */
2307 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2308 {
2309 struct iscsi_session *session = cls_session->dd_data;
2310 struct module *owner = cls_session->transport->owner;
2311 struct Scsi_Host *shost = session->host;
2312
2313 iscsi_pool_free(&session->cmdpool);
2314
2315 kfree(session->password);
2316 kfree(session->password_in);
2317 kfree(session->username);
2318 kfree(session->username_in);
2319 kfree(session->targetname);
2320 kfree(session->initiatorname);
2321 kfree(session->ifacename);
2322
2323 iscsi_destroy_session(cls_session);
2324 iscsi_host_dec_session_cnt(shost);
2325 module_put(owner);
2326 }
2327 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2328
2329 /**
2330 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2331 * @cls_session: iscsi_cls_session
2332 * @dd_size: private driver data size
2333 * @conn_idx: cid
2334 */
2335 struct iscsi_cls_conn *
2336 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2337 uint32_t conn_idx)
2338 {
2339 struct iscsi_session *session = cls_session->dd_data;
2340 struct iscsi_conn *conn;
2341 struct iscsi_cls_conn *cls_conn;
2342 char *data;
2343
2344 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2345 conn_idx);
2346 if (!cls_conn)
2347 return NULL;
2348 conn = cls_conn->dd_data;
2349 memset(conn, 0, sizeof(*conn) + dd_size);
2350
2351 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2352 conn->session = session;
2353 conn->cls_conn = cls_conn;
2354 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2355 conn->id = conn_idx;
2356 conn->exp_statsn = 0;
2357 conn->tmf_state = TMF_INITIAL;
2358
2359 init_timer(&conn->transport_timer);
2360 conn->transport_timer.data = (unsigned long)conn;
2361 conn->transport_timer.function = iscsi_check_transport_timeouts;
2362
2363 INIT_LIST_HEAD(&conn->run_list);
2364 INIT_LIST_HEAD(&conn->mgmt_run_list);
2365 INIT_LIST_HEAD(&conn->mgmtqueue);
2366 INIT_LIST_HEAD(&conn->xmitqueue);
2367 INIT_LIST_HEAD(&conn->requeue);
2368 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2369
2370 /* allocate login_task used for the login/text sequences */
2371 spin_lock_bh(&session->lock);
2372 if (!__kfifo_get(session->cmdpool.queue,
2373 (void*)&conn->login_task,
2374 sizeof(void*))) {
2375 spin_unlock_bh(&session->lock);
2376 goto login_task_alloc_fail;
2377 }
2378 spin_unlock_bh(&session->lock);
2379
2380 data = (char *) __get_free_pages(GFP_KERNEL,
2381 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2382 if (!data)
2383 goto login_task_data_alloc_fail;
2384 conn->login_task->data = conn->data = data;
2385
2386 init_timer(&conn->tmf_timer);
2387 init_waitqueue_head(&conn->ehwait);
2388
2389 return cls_conn;
2390
2391 login_task_data_alloc_fail:
2392 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2393 sizeof(void*));
2394 login_task_alloc_fail:
2395 iscsi_destroy_conn(cls_conn);
2396 return NULL;
2397 }
2398 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2399
2400 /**
2401 * iscsi_conn_teardown - teardown iscsi connection
2402 * cls_conn: iscsi class connection
2403 *
2404 * TODO: we may need to make this into a two step process
2405 * like scsi-mls remove + put host
2406 */
2407 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2408 {
2409 struct iscsi_conn *conn = cls_conn->dd_data;
2410 struct iscsi_session *session = conn->session;
2411 unsigned long flags;
2412
2413 del_timer_sync(&conn->transport_timer);
2414
2415 spin_lock_bh(&session->lock);
2416 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2417 if (session->leadconn == conn) {
2418 /*
2419 * leading connection? then give up on recovery.
2420 */
2421 session->state = ISCSI_STATE_TERMINATE;
2422 wake_up(&conn->ehwait);
2423 }
2424 spin_unlock_bh(&session->lock);
2425
2426 /*
2427 * Block until all in-progress commands for this connection
2428 * time out or fail.
2429 */
2430 for (;;) {
2431 spin_lock_irqsave(session->host->host_lock, flags);
2432 if (!session->host->host_busy) { /* OK for ERL == 0 */
2433 spin_unlock_irqrestore(session->host->host_lock, flags);
2434 break;
2435 }
2436 spin_unlock_irqrestore(session->host->host_lock, flags);
2437 msleep_interruptible(500);
2438 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2439 "host_busy %d host_failed %d\n",
2440 session->host->host_busy,
2441 session->host->host_failed);
2442 /*
2443 * force eh_abort() to unblock
2444 */
2445 wake_up(&conn->ehwait);
2446 }
2447
2448 /* flush queued up work because we free the connection below */
2449 iscsi_suspend_tx(conn);
2450
2451 spin_lock_bh(&session->lock);
2452 free_pages((unsigned long) conn->data,
2453 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2454 kfree(conn->persistent_address);
2455 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2456 sizeof(void*));
2457 if (session->leadconn == conn)
2458 session->leadconn = NULL;
2459 spin_unlock_bh(&session->lock);
2460
2461 iscsi_destroy_conn(cls_conn);
2462 }
2463 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2464
2465 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2466 {
2467 struct iscsi_conn *conn = cls_conn->dd_data;
2468 struct iscsi_session *session = conn->session;
2469
2470 if (!session) {
2471 iscsi_conn_printk(KERN_ERR, conn,
2472 "can't start unbound connection\n");
2473 return -EPERM;
2474 }
2475
2476 if ((session->imm_data_en || !session->initial_r2t_en) &&
2477 session->first_burst > session->max_burst) {
2478 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2479 "first_burst %d max_burst %d\n",
2480 session->first_burst, session->max_burst);
2481 return -EINVAL;
2482 }
2483
2484 if (conn->ping_timeout && !conn->recv_timeout) {
2485 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2486 "zero. Using 5 seconds\n.");
2487 conn->recv_timeout = 5;
2488 }
2489
2490 if (conn->recv_timeout && !conn->ping_timeout) {
2491 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2492 "zero. Using 5 seconds.\n");
2493 conn->ping_timeout = 5;
2494 }
2495
2496 spin_lock_bh(&session->lock);
2497 conn->c_stage = ISCSI_CONN_STARTED;
2498 session->state = ISCSI_STATE_LOGGED_IN;
2499 session->queued_cmdsn = session->cmdsn;
2500
2501 conn->last_recv = jiffies;
2502 conn->last_ping = jiffies;
2503 if (conn->recv_timeout && conn->ping_timeout)
2504 mod_timer(&conn->transport_timer,
2505 jiffies + (conn->recv_timeout * HZ));
2506
2507 switch(conn->stop_stage) {
2508 case STOP_CONN_RECOVER:
2509 /*
2510 * unblock eh_abort() if it is blocked. re-try all
2511 * commands after successful recovery
2512 */
2513 conn->stop_stage = 0;
2514 conn->tmf_state = TMF_INITIAL;
2515 session->age++;
2516 if (session->age == 16)
2517 session->age = 0;
2518 break;
2519 case STOP_CONN_TERM:
2520 conn->stop_stage = 0;
2521 break;
2522 default:
2523 break;
2524 }
2525 spin_unlock_bh(&session->lock);
2526
2527 iscsi_unblock_session(session->cls_session);
2528 wake_up(&conn->ehwait);
2529 return 0;
2530 }
2531 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2532
2533 static void
2534 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2535 {
2536 struct iscsi_task *task, *tmp;
2537
2538 /* handle pending */
2539 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2540 ISCSI_DBG_SESSION(session, "flushing pending mgmt task "
2541 "itt 0x%x\n", task->itt);
2542 /* release ref from prep task */
2543 __iscsi_put_task(task);
2544 }
2545
2546 /* handle running */
2547 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2548 ISCSI_DBG_SESSION(session, "flushing running mgmt task "
2549 "itt 0x%x\n", task->itt);
2550 /* release ref from prep task */
2551 __iscsi_put_task(task);
2552 }
2553
2554 conn->task = NULL;
2555 }
2556
2557 static void iscsi_start_session_recovery(struct iscsi_session *session,
2558 struct iscsi_conn *conn, int flag)
2559 {
2560 int old_stop_stage;
2561
2562 del_timer_sync(&conn->transport_timer);
2563
2564 mutex_lock(&session->eh_mutex);
2565 spin_lock_bh(&session->lock);
2566 if (conn->stop_stage == STOP_CONN_TERM) {
2567 spin_unlock_bh(&session->lock);
2568 mutex_unlock(&session->eh_mutex);
2569 return;
2570 }
2571
2572 /*
2573 * When this is called for the in_login state, we only want to clean
2574 * up the login task and connection. We do not need to block and set
2575 * the recovery state again
2576 */
2577 if (flag == STOP_CONN_TERM)
2578 session->state = ISCSI_STATE_TERMINATE;
2579 else if (conn->stop_stage != STOP_CONN_RECOVER)
2580 session->state = ISCSI_STATE_IN_RECOVERY;
2581
2582 old_stop_stage = conn->stop_stage;
2583 conn->stop_stage = flag;
2584 conn->c_stage = ISCSI_CONN_STOPPED;
2585 spin_unlock_bh(&session->lock);
2586
2587 iscsi_suspend_tx(conn);
2588 /*
2589 * for connection level recovery we should not calculate
2590 * header digest. conn->hdr_size used for optimization
2591 * in hdr_extract() and will be re-negotiated at
2592 * set_param() time.
2593 */
2594 if (flag == STOP_CONN_RECOVER) {
2595 conn->hdrdgst_en = 0;
2596 conn->datadgst_en = 0;
2597 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2598 old_stop_stage != STOP_CONN_RECOVER) {
2599 ISCSI_DBG_SESSION(session, "blocking session\n");
2600 iscsi_block_session(session->cls_session);
2601 }
2602 }
2603
2604 /*
2605 * flush queues.
2606 */
2607 spin_lock_bh(&session->lock);
2608 if (flag == STOP_CONN_RECOVER)
2609 fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
2610 else
2611 fail_all_commands(conn, -1, DID_ERROR);
2612 flush_control_queues(session, conn);
2613 spin_unlock_bh(&session->lock);
2614 mutex_unlock(&session->eh_mutex);
2615 }
2616
2617 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2618 {
2619 struct iscsi_conn *conn = cls_conn->dd_data;
2620 struct iscsi_session *session = conn->session;
2621
2622 switch (flag) {
2623 case STOP_CONN_RECOVER:
2624 case STOP_CONN_TERM:
2625 iscsi_start_session_recovery(session, conn, flag);
2626 break;
2627 default:
2628 iscsi_conn_printk(KERN_ERR, conn,
2629 "invalid stop flag %d\n", flag);
2630 }
2631 }
2632 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2633
2634 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2635 struct iscsi_cls_conn *cls_conn, int is_leading)
2636 {
2637 struct iscsi_session *session = cls_session->dd_data;
2638 struct iscsi_conn *conn = cls_conn->dd_data;
2639
2640 spin_lock_bh(&session->lock);
2641 if (is_leading)
2642 session->leadconn = conn;
2643 spin_unlock_bh(&session->lock);
2644
2645 /*
2646 * Unblock xmitworker(), Login Phase will pass through.
2647 */
2648 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2649 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2650 return 0;
2651 }
2652 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2653
2654
2655 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2656 enum iscsi_param param, char *buf, int buflen)
2657 {
2658 struct iscsi_conn *conn = cls_conn->dd_data;
2659 struct iscsi_session *session = conn->session;
2660 uint32_t value;
2661
2662 switch(param) {
2663 case ISCSI_PARAM_FAST_ABORT:
2664 sscanf(buf, "%d", &session->fast_abort);
2665 break;
2666 case ISCSI_PARAM_ABORT_TMO:
2667 sscanf(buf, "%d", &session->abort_timeout);
2668 break;
2669 case ISCSI_PARAM_LU_RESET_TMO:
2670 sscanf(buf, "%d", &session->lu_reset_timeout);
2671 break;
2672 case ISCSI_PARAM_PING_TMO:
2673 sscanf(buf, "%d", &conn->ping_timeout);
2674 break;
2675 case ISCSI_PARAM_RECV_TMO:
2676 sscanf(buf, "%d", &conn->recv_timeout);
2677 break;
2678 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2679 sscanf(buf, "%d", &conn->max_recv_dlength);
2680 break;
2681 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2682 sscanf(buf, "%d", &conn->max_xmit_dlength);
2683 break;
2684 case ISCSI_PARAM_HDRDGST_EN:
2685 sscanf(buf, "%d", &conn->hdrdgst_en);
2686 break;
2687 case ISCSI_PARAM_DATADGST_EN:
2688 sscanf(buf, "%d", &conn->datadgst_en);
2689 break;
2690 case ISCSI_PARAM_INITIAL_R2T_EN:
2691 sscanf(buf, "%d", &session->initial_r2t_en);
2692 break;
2693 case ISCSI_PARAM_MAX_R2T:
2694 sscanf(buf, "%d", &session->max_r2t);
2695 break;
2696 case ISCSI_PARAM_IMM_DATA_EN:
2697 sscanf(buf, "%d", &session->imm_data_en);
2698 break;
2699 case ISCSI_PARAM_FIRST_BURST:
2700 sscanf(buf, "%d", &session->first_burst);
2701 break;
2702 case ISCSI_PARAM_MAX_BURST:
2703 sscanf(buf, "%d", &session->max_burst);
2704 break;
2705 case ISCSI_PARAM_PDU_INORDER_EN:
2706 sscanf(buf, "%d", &session->pdu_inorder_en);
2707 break;
2708 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2709 sscanf(buf, "%d", &session->dataseq_inorder_en);
2710 break;
2711 case ISCSI_PARAM_ERL:
2712 sscanf(buf, "%d", &session->erl);
2713 break;
2714 case ISCSI_PARAM_IFMARKER_EN:
2715 sscanf(buf, "%d", &value);
2716 BUG_ON(value);
2717 break;
2718 case ISCSI_PARAM_OFMARKER_EN:
2719 sscanf(buf, "%d", &value);
2720 BUG_ON(value);
2721 break;
2722 case ISCSI_PARAM_EXP_STATSN:
2723 sscanf(buf, "%u", &conn->exp_statsn);
2724 break;
2725 case ISCSI_PARAM_USERNAME:
2726 kfree(session->username);
2727 session->username = kstrdup(buf, GFP_KERNEL);
2728 if (!session->username)
2729 return -ENOMEM;
2730 break;
2731 case ISCSI_PARAM_USERNAME_IN:
2732 kfree(session->username_in);
2733 session->username_in = kstrdup(buf, GFP_KERNEL);
2734 if (!session->username_in)
2735 return -ENOMEM;
2736 break;
2737 case ISCSI_PARAM_PASSWORD:
2738 kfree(session->password);
2739 session->password = kstrdup(buf, GFP_KERNEL);
2740 if (!session->password)
2741 return -ENOMEM;
2742 break;
2743 case ISCSI_PARAM_PASSWORD_IN:
2744 kfree(session->password_in);
2745 session->password_in = kstrdup(buf, GFP_KERNEL);
2746 if (!session->password_in)
2747 return -ENOMEM;
2748 break;
2749 case ISCSI_PARAM_TARGET_NAME:
2750 /* this should not change between logins */
2751 if (session->targetname)
2752 break;
2753
2754 session->targetname = kstrdup(buf, GFP_KERNEL);
2755 if (!session->targetname)
2756 return -ENOMEM;
2757 break;
2758 case ISCSI_PARAM_TPGT:
2759 sscanf(buf, "%d", &session->tpgt);
2760 break;
2761 case ISCSI_PARAM_PERSISTENT_PORT:
2762 sscanf(buf, "%d", &conn->persistent_port);
2763 break;
2764 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2765 /*
2766 * this is the address returned in discovery so it should
2767 * not change between logins.
2768 */
2769 if (conn->persistent_address)
2770 break;
2771
2772 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2773 if (!conn->persistent_address)
2774 return -ENOMEM;
2775 break;
2776 case ISCSI_PARAM_IFACE_NAME:
2777 if (!session->ifacename)
2778 session->ifacename = kstrdup(buf, GFP_KERNEL);
2779 break;
2780 case ISCSI_PARAM_INITIATOR_NAME:
2781 if (!session->initiatorname)
2782 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2783 break;
2784 default:
2785 return -ENOSYS;
2786 }
2787
2788 return 0;
2789 }
2790 EXPORT_SYMBOL_GPL(iscsi_set_param);
2791
2792 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2793 enum iscsi_param param, char *buf)
2794 {
2795 struct iscsi_session *session = cls_session->dd_data;
2796 int len;
2797
2798 switch(param) {
2799 case ISCSI_PARAM_FAST_ABORT:
2800 len = sprintf(buf, "%d\n", session->fast_abort);
2801 break;
2802 case ISCSI_PARAM_ABORT_TMO:
2803 len = sprintf(buf, "%d\n", session->abort_timeout);
2804 break;
2805 case ISCSI_PARAM_LU_RESET_TMO:
2806 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2807 break;
2808 case ISCSI_PARAM_INITIAL_R2T_EN:
2809 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2810 break;
2811 case ISCSI_PARAM_MAX_R2T:
2812 len = sprintf(buf, "%hu\n", session->max_r2t);
2813 break;
2814 case ISCSI_PARAM_IMM_DATA_EN:
2815 len = sprintf(buf, "%d\n", session->imm_data_en);
2816 break;
2817 case ISCSI_PARAM_FIRST_BURST:
2818 len = sprintf(buf, "%u\n", session->first_burst);
2819 break;
2820 case ISCSI_PARAM_MAX_BURST:
2821 len = sprintf(buf, "%u\n", session->max_burst);
2822 break;
2823 case ISCSI_PARAM_PDU_INORDER_EN:
2824 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2825 break;
2826 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2827 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2828 break;
2829 case ISCSI_PARAM_ERL:
2830 len = sprintf(buf, "%d\n", session->erl);
2831 break;
2832 case ISCSI_PARAM_TARGET_NAME:
2833 len = sprintf(buf, "%s\n", session->targetname);
2834 break;
2835 case ISCSI_PARAM_TPGT:
2836 len = sprintf(buf, "%d\n", session->tpgt);
2837 break;
2838 case ISCSI_PARAM_USERNAME:
2839 len = sprintf(buf, "%s\n", session->username);
2840 break;
2841 case ISCSI_PARAM_USERNAME_IN:
2842 len = sprintf(buf, "%s\n", session->username_in);
2843 break;
2844 case ISCSI_PARAM_PASSWORD:
2845 len = sprintf(buf, "%s\n", session->password);
2846 break;
2847 case ISCSI_PARAM_PASSWORD_IN:
2848 len = sprintf(buf, "%s\n", session->password_in);
2849 break;
2850 case ISCSI_PARAM_IFACE_NAME:
2851 len = sprintf(buf, "%s\n", session->ifacename);
2852 break;
2853 case ISCSI_PARAM_INITIATOR_NAME:
2854 if (!session->initiatorname)
2855 len = sprintf(buf, "%s\n", "unknown");
2856 else
2857 len = sprintf(buf, "%s\n", session->initiatorname);
2858 break;
2859 default:
2860 return -ENOSYS;
2861 }
2862
2863 return len;
2864 }
2865 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2866
2867 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2868 enum iscsi_param param, char *buf)
2869 {
2870 struct iscsi_conn *conn = cls_conn->dd_data;
2871 int len;
2872
2873 switch(param) {
2874 case ISCSI_PARAM_PING_TMO:
2875 len = sprintf(buf, "%u\n", conn->ping_timeout);
2876 break;
2877 case ISCSI_PARAM_RECV_TMO:
2878 len = sprintf(buf, "%u\n", conn->recv_timeout);
2879 break;
2880 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2881 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2882 break;
2883 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2884 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2885 break;
2886 case ISCSI_PARAM_HDRDGST_EN:
2887 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2888 break;
2889 case ISCSI_PARAM_DATADGST_EN:
2890 len = sprintf(buf, "%d\n", conn->datadgst_en);
2891 break;
2892 case ISCSI_PARAM_IFMARKER_EN:
2893 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2894 break;
2895 case ISCSI_PARAM_OFMARKER_EN:
2896 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2897 break;
2898 case ISCSI_PARAM_EXP_STATSN:
2899 len = sprintf(buf, "%u\n", conn->exp_statsn);
2900 break;
2901 case ISCSI_PARAM_PERSISTENT_PORT:
2902 len = sprintf(buf, "%d\n", conn->persistent_port);
2903 break;
2904 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2905 len = sprintf(buf, "%s\n", conn->persistent_address);
2906 break;
2907 default:
2908 return -ENOSYS;
2909 }
2910
2911 return len;
2912 }
2913 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2914
2915 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2916 char *buf)
2917 {
2918 struct iscsi_host *ihost = shost_priv(shost);
2919 int len;
2920
2921 switch (param) {
2922 case ISCSI_HOST_PARAM_NETDEV_NAME:
2923 if (!ihost->netdev)
2924 len = sprintf(buf, "%s\n", "default");
2925 else
2926 len = sprintf(buf, "%s\n", ihost->netdev);
2927 break;
2928 case ISCSI_HOST_PARAM_HWADDRESS:
2929 if (!ihost->hwaddress)
2930 len = sprintf(buf, "%s\n", "default");
2931 else
2932 len = sprintf(buf, "%s\n", ihost->hwaddress);
2933 break;
2934 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2935 if (!ihost->initiatorname)
2936 len = sprintf(buf, "%s\n", "unknown");
2937 else
2938 len = sprintf(buf, "%s\n", ihost->initiatorname);
2939 break;
2940 case ISCSI_HOST_PARAM_IPADDRESS:
2941 if (!strlen(ihost->local_address))
2942 len = sprintf(buf, "%s\n", "unknown");
2943 else
2944 len = sprintf(buf, "%s\n",
2945 ihost->local_address);
2946 break;
2947 default:
2948 return -ENOSYS;
2949 }
2950
2951 return len;
2952 }
2953 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2954
2955 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2956 char *buf, int buflen)
2957 {
2958 struct iscsi_host *ihost = shost_priv(shost);
2959
2960 switch (param) {
2961 case ISCSI_HOST_PARAM_NETDEV_NAME:
2962 if (!ihost->netdev)
2963 ihost->netdev = kstrdup(buf, GFP_KERNEL);
2964 break;
2965 case ISCSI_HOST_PARAM_HWADDRESS:
2966 if (!ihost->hwaddress)
2967 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
2968 break;
2969 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2970 if (!ihost->initiatorname)
2971 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
2972 break;
2973 default:
2974 return -ENOSYS;
2975 }
2976
2977 return 0;
2978 }
2979 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2980
2981 MODULE_AUTHOR("Mike Christie");
2982 MODULE_DESCRIPTION("iSCSI library functions");
2983 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards