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[SCSI] libiscsi: check of LLD has a alloc pdu callout.
[deliverable/linux.git] / drivers / scsi / libiscsi.c
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CommitLineData
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
41static int iscsi_dbg_lib;
42module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR);
43MODULE_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
66static 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 */
73static 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
79inline 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}
86EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
87
88void
89iscsi_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}
119EXPORT_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 **/
133void 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}
161EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
162
163static 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 */
180static 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
217static 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 */
250static 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 if (conn->session->tt->alloc_pdu) {
261 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
262 if (rc)
263 return rc;
264 }
265 hdr = (struct iscsi_cmd *) task->hdr;
266 itt = hdr->itt;
267 memset(hdr, 0, sizeof(*hdr));
268
269 if (session->tt->parse_pdu_itt)
270 hdr->itt = task->hdr_itt = itt;
271 else
272 hdr->itt = task->hdr_itt = build_itt(task->itt,
273 task->conn->session->age);
274 task->hdr_len = 0;
275 rc = iscsi_add_hdr(task, sizeof(*hdr));
276 if (rc)
277 return rc;
278 hdr->opcode = ISCSI_OP_SCSI_CMD;
279 hdr->flags = ISCSI_ATTR_SIMPLE;
280 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
281 memcpy(task->lun, hdr->lun, sizeof(task->lun));
282 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
283 session->cmdsn++;
284 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
285 cmd_len = sc->cmd_len;
286 if (cmd_len < ISCSI_CDB_SIZE)
287 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
288 else if (cmd_len > ISCSI_CDB_SIZE) {
289 rc = iscsi_prep_ecdb_ahs(task);
290 if (rc)
291 return rc;
292 cmd_len = ISCSI_CDB_SIZE;
293 }
294 memcpy(hdr->cdb, sc->cmnd, cmd_len);
295
296 task->imm_count = 0;
297 if (scsi_bidi_cmnd(sc)) {
298 hdr->flags |= ISCSI_FLAG_CMD_READ;
299 rc = iscsi_prep_bidi_ahs(task);
300 if (rc)
301 return rc;
302 }
303 if (sc->sc_data_direction == DMA_TO_DEVICE) {
304 unsigned out_len = scsi_out(sc)->length;
305 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
306
307 hdr->data_length = cpu_to_be32(out_len);
308 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
309 /*
310 * Write counters:
311 *
312 * imm_count bytes to be sent right after
313 * SCSI PDU Header
314 *
315 * unsol_count bytes(as Data-Out) to be sent
316 * without R2T ack right after
317 * immediate data
318 *
319 * r2t data_length bytes to be sent via R2T ack's
320 *
321 * pad_count bytes to be sent as zero-padding
322 */
323 memset(r2t, 0, sizeof(*r2t));
324
325 if (session->imm_data_en) {
326 if (out_len >= session->first_burst)
327 task->imm_count = min(session->first_burst,
328 conn->max_xmit_dlength);
329 else
330 task->imm_count = min(out_len,
331 conn->max_xmit_dlength);
332 hton24(hdr->dlength, task->imm_count);
333 } else
334 zero_data(hdr->dlength);
335
336 if (!session->initial_r2t_en) {
337 r2t->data_length = min(session->first_burst, out_len) -
338 task->imm_count;
339 r2t->data_offset = task->imm_count;
340 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
341 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
342 }
343
344 if (!task->unsol_r2t.data_length)
345 /* No unsolicit Data-Out's */
346 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
347 } else {
348 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
349 zero_data(hdr->dlength);
350 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
351
352 if (sc->sc_data_direction == DMA_FROM_DEVICE)
353 hdr->flags |= ISCSI_FLAG_CMD_READ;
354 }
355
356 /* calculate size of additional header segments (AHSs) */
357 hdrlength = task->hdr_len - sizeof(*hdr);
358
359 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
360 hdrlength /= ISCSI_PAD_LEN;
361
362 WARN_ON(hdrlength >= 256);
363 hdr->hlength = hdrlength & 0xFF;
364
365 if (session->tt->init_task && session->tt->init_task(task))
366 return -EIO;
367
368 task->state = ISCSI_TASK_RUNNING;
369 list_move_tail(&task->running, &conn->run_list);
370
371 conn->scsicmd_pdus_cnt++;
372 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
373 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
374 scsi_bidi_cmnd(sc) ? "bidirectional" :
375 sc->sc_data_direction == DMA_TO_DEVICE ?
376 "write" : "read", conn->id, sc, sc->cmnd[0],
377 task->itt, scsi_bufflen(sc),
378 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
379 session->cmdsn,
380 session->max_cmdsn - session->exp_cmdsn + 1);
381 return 0;
382}
383
384/**
385 * iscsi_complete_command - finish a task
386 * @task: iscsi cmd task
387 *
388 * Must be called with session lock.
389 * This function returns the scsi command to scsi-ml or cleans
390 * up mgmt tasks then returns the task to the pool.
391 */
392static void iscsi_complete_command(struct iscsi_task *task)
393{
394 struct iscsi_conn *conn = task->conn;
395 struct iscsi_session *session = conn->session;
396 struct scsi_cmnd *sc = task->sc;
397
398 session->tt->cleanup_task(task);
399 list_del_init(&task->running);
400 task->state = ISCSI_TASK_COMPLETED;
401 task->sc = NULL;
402
403 if (conn->task == task)
404 conn->task = NULL;
405 /*
406 * login task is preallocated so do not free
407 */
408 if (conn->login_task == task)
409 return;
410
411 __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
412
413 if (conn->ping_task == task)
414 conn->ping_task = NULL;
415
416 if (sc) {
417 task->sc = NULL;
418 /* SCSI eh reuses commands to verify us */
419 sc->SCp.ptr = NULL;
420 /*
421 * queue command may call this to free the task, but
422 * not have setup the sc callback
423 */
424 if (sc->scsi_done)
425 sc->scsi_done(sc);
426 }
427}
428
429void __iscsi_get_task(struct iscsi_task *task)
430{
431 atomic_inc(&task->refcount);
432}
433EXPORT_SYMBOL_GPL(__iscsi_get_task);
434
435static void __iscsi_put_task(struct iscsi_task *task)
436{
437 if (atomic_dec_and_test(&task->refcount))
438 iscsi_complete_command(task);
439}
440
441void iscsi_put_task(struct iscsi_task *task)
442{
443 struct iscsi_session *session = task->conn->session;
444
445 spin_lock_bh(&session->lock);
446 __iscsi_put_task(task);
447 spin_unlock_bh(&session->lock);
448}
449EXPORT_SYMBOL_GPL(iscsi_put_task);
450
451/*
452 * session lock must be held
453 */
454static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
455 int err)
456{
457 struct scsi_cmnd *sc;
458
459 sc = task->sc;
460 if (!sc)
461 return;
462
463 if (task->state == ISCSI_TASK_PENDING)
464 /*
465 * cmd never made it to the xmit thread, so we should not count
466 * the cmd in the sequencing
467 */
468 conn->session->queued_cmdsn--;
469
470 sc->result = err;
471 if (!scsi_bidi_cmnd(sc))
472 scsi_set_resid(sc, scsi_bufflen(sc));
473 else {
474 scsi_out(sc)->resid = scsi_out(sc)->length;
475 scsi_in(sc)->resid = scsi_in(sc)->length;
476 }
477
478 if (conn->task == task)
479 conn->task = NULL;
480 /* release ref from queuecommand */
481 __iscsi_put_task(task);
482}
483
484static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
485 struct iscsi_task *task)
486{
487 struct iscsi_session *session = conn->session;
488 struct iscsi_hdr *hdr = task->hdr;
489 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
490
491 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
492 return -ENOTCONN;
493
494 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
495 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
496 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
497 /*
498 * pre-format CmdSN for outgoing PDU.
499 */
500 nop->cmdsn = cpu_to_be32(session->cmdsn);
501 if (hdr->itt != RESERVED_ITT) {
502 /*
503 * TODO: We always use immediate, so we never hit this.
504 * If we start to send tmfs or nops as non-immediate then
505 * we should start checking the cmdsn numbers for mgmt tasks.
506 */
507 if (conn->c_stage == ISCSI_CONN_STARTED &&
508 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
509 session->queued_cmdsn++;
510 session->cmdsn++;
511 }
512 }
513
514 if (session->tt->init_task && session->tt->init_task(task))
515 return -EIO;
516
517 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
518 session->state = ISCSI_STATE_LOGGING_OUT;
519
520 task->state = ISCSI_TASK_RUNNING;
521 list_move_tail(&task->running, &conn->mgmt_run_list);
522 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
523 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
524 hdr->itt, task->data_count);
525 return 0;
526}
527
528static struct iscsi_task *
529__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
530 char *data, uint32_t data_size)
531{
532 struct iscsi_session *session = conn->session;
533 struct iscsi_task *task;
534 itt_t itt;
535
536 if (session->state == ISCSI_STATE_TERMINATE)
537 return NULL;
538
539 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
540 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
541 /*
542 * Login and Text are sent serially, in
543 * request-followed-by-response sequence.
544 * Same task can be used. Same ITT must be used.
545 * Note that login_task is preallocated at conn_create().
546 */
547 task = conn->login_task;
548 else {
549 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
550 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
551
552 if (!__kfifo_get(session->cmdpool.queue,
553 (void*)&task, sizeof(void*)))
554 return NULL;
555 }
556 /*
557 * released in complete pdu for task we expect a response for, and
558 * released by the lld when it has transmitted the task for
559 * pdus we do not expect a response for.
560 */
561 atomic_set(&task->refcount, 1);
562 task->conn = conn;
563 task->sc = NULL;
564
565 if (data_size) {
566 memcpy(task->data, data, data_size);
567 task->data_count = data_size;
568 } else
569 task->data_count = 0;
570
571 if (conn->session->tt->alloc_pdu) {
572 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
573 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
574 "pdu for mgmt task.\n");
575 goto requeue_task;
576 }
577 }
578
579 itt = task->hdr->itt;
580 task->hdr_len = sizeof(struct iscsi_hdr);
581 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
582
583 if (hdr->itt != RESERVED_ITT) {
584 if (session->tt->parse_pdu_itt)
585 task->hdr->itt = itt;
586 else
587 task->hdr->itt = build_itt(task->itt,
588 task->conn->session->age);
589 }
590
591 INIT_LIST_HEAD(&task->running);
592 list_add_tail(&task->running, &conn->mgmtqueue);
593
594 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
595 if (iscsi_prep_mgmt_task(conn, task))
596 goto free_task;
597
598 if (session->tt->xmit_task(task))
599 goto free_task;
600
601 } else
602 iscsi_conn_queue_work(conn);
603
604 return task;
605
606free_task:
607 __iscsi_put_task(task);
608 return NULL;
609
610requeue_task:
611 if (task != conn->login_task)
612 __kfifo_put(session->cmdpool.queue, (void*)&task,
613 sizeof(void*));
614 return NULL;
615}
616
617int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
618 char *data, uint32_t data_size)
619{
620 struct iscsi_conn *conn = cls_conn->dd_data;
621 struct iscsi_session *session = conn->session;
622 int err = 0;
623
624 spin_lock_bh(&session->lock);
625 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
626 err = -EPERM;
627 spin_unlock_bh(&session->lock);
628 return err;
629}
630EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
631
632/**
633 * iscsi_cmd_rsp - SCSI Command Response processing
634 * @conn: iscsi connection
635 * @hdr: iscsi header
636 * @task: scsi command task
637 * @data: cmd data buffer
638 * @datalen: len of buffer
639 *
640 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
641 * then completes the command and task.
642 **/
643static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
644 struct iscsi_task *task, char *data,
645 int datalen)
646{
647 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
648 struct iscsi_session *session = conn->session;
649 struct scsi_cmnd *sc = task->sc;
650
651 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
652 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
653
654 sc->result = (DID_OK << 16) | rhdr->cmd_status;
655
656 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
657 sc->result = DID_ERROR << 16;
658 goto out;
659 }
660
661 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
662 uint16_t senselen;
663
664 if (datalen < 2) {
665invalid_datalen:
666 iscsi_conn_printk(KERN_ERR, conn,
667 "Got CHECK_CONDITION but invalid data "
668 "buffer size of %d\n", datalen);
669 sc->result = DID_BAD_TARGET << 16;
670 goto out;
671 }
672
673 senselen = get_unaligned_be16(data);
674 if (datalen < senselen)
675 goto invalid_datalen;
676
677 memcpy(sc->sense_buffer, data + 2,
678 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
679 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
680 min_t(uint16_t, senselen,
681 SCSI_SENSE_BUFFERSIZE));
682 }
683
684 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
685 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
686 int res_count = be32_to_cpu(rhdr->bi_residual_count);
687
688 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
689 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
690 res_count <= scsi_in(sc)->length))
691 scsi_in(sc)->resid = res_count;
692 else
693 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
694 }
695
696 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
697 ISCSI_FLAG_CMD_OVERFLOW)) {
698 int res_count = be32_to_cpu(rhdr->residual_count);
699
700 if (res_count > 0 &&
701 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
702 res_count <= scsi_bufflen(sc)))
703 /* write side for bidi or uni-io set_resid */
704 scsi_set_resid(sc, res_count);
705 else
706 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
707 }
708out:
709 ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n",
710 sc, sc->result, task->itt);
711 conn->scsirsp_pdus_cnt++;
712
713 __iscsi_put_task(task);
714}
715
716/**
717 * iscsi_data_in_rsp - SCSI Data-In Response processing
718 * @conn: iscsi connection
719 * @hdr: iscsi pdu
720 * @task: scsi command task
721 **/
722static void
723iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
724 struct iscsi_task *task)
725{
726 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
727 struct scsi_cmnd *sc = task->sc;
728
729 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
730 return;
731
732 sc->result = (DID_OK << 16) | rhdr->cmd_status;
733 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
734 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
735 ISCSI_FLAG_DATA_OVERFLOW)) {
736 int res_count = be32_to_cpu(rhdr->residual_count);
737
738 if (res_count > 0 &&
739 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
740 res_count <= scsi_in(sc)->length))
741 scsi_in(sc)->resid = res_count;
742 else
743 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
744 }
745
746 conn->scsirsp_pdus_cnt++;
747 __iscsi_put_task(task);
748}
749
750static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
751{
752 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
753
754 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
755 conn->tmfrsp_pdus_cnt++;
756
757 if (conn->tmf_state != TMF_QUEUED)
758 return;
759
760 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
761 conn->tmf_state = TMF_SUCCESS;
762 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
763 conn->tmf_state = TMF_NOT_FOUND;
764 else
765 conn->tmf_state = TMF_FAILED;
766 wake_up(&conn->ehwait);
767}
768
769static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
770{
771 struct iscsi_nopout hdr;
772 struct iscsi_task *task;
773
774 if (!rhdr && conn->ping_task)
775 return;
776
777 memset(&hdr, 0, sizeof(struct iscsi_nopout));
778 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
779 hdr.flags = ISCSI_FLAG_CMD_FINAL;
780
781 if (rhdr) {
782 memcpy(hdr.lun, rhdr->lun, 8);
783 hdr.ttt = rhdr->ttt;
784 hdr.itt = RESERVED_ITT;
785 } else
786 hdr.ttt = RESERVED_ITT;
787
788 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
789 if (!task)
790 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
791 else if (!rhdr) {
792 /* only track our nops */
793 conn->ping_task = task;
794 conn->last_ping = jiffies;
795 }
796}
797
798static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
799 char *data, int datalen)
800{
801 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
802 struct iscsi_hdr rejected_pdu;
803
804 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
805
806 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
807 if (ntoh24(reject->dlength) > datalen)
808 return ISCSI_ERR_PROTO;
809
810 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
811 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
812 iscsi_conn_printk(KERN_ERR, conn,
813 "pdu (op 0x%x) rejected "
814 "due to DataDigest error.\n",
815 rejected_pdu.opcode);
816 }
817 }
818 return 0;
819}
820
821/**
822 * iscsi_itt_to_task - look up task by itt
823 * @conn: iscsi connection
824 * @itt: itt
825 *
826 * This should be used for mgmt tasks like login and nops, or if
827 * the LDD's itt space does not include the session age.
828 *
829 * The session lock must be held.
830 */
831static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
832{
833 struct iscsi_session *session = conn->session;
834 int i;
835
836 if (itt == RESERVED_ITT)
837 return NULL;
838
839 if (session->tt->parse_pdu_itt)
840 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
841 else
842 i = get_itt(itt);
843 if (i >= session->cmds_max)
844 return NULL;
845
846 return session->cmds[i];
847}
848
849/**
850 * __iscsi_complete_pdu - complete pdu
851 * @conn: iscsi conn
852 * @hdr: iscsi header
853 * @data: data buffer
854 * @datalen: len of data buffer
855 *
856 * Completes pdu processing by freeing any resources allocated at
857 * queuecommand or send generic. session lock must be held and verify
858 * itt must have been called.
859 */
860int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
861 char *data, int datalen)
862{
863 struct iscsi_session *session = conn->session;
864 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
865 struct iscsi_task *task;
866 uint32_t itt;
867
868 conn->last_recv = jiffies;
869 rc = iscsi_verify_itt(conn, hdr->itt);
870 if (rc)
871 return rc;
872
873 if (hdr->itt != RESERVED_ITT)
874 itt = get_itt(hdr->itt);
875 else
876 itt = ~0U;
877
878 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
879 opcode, conn->id, itt, datalen);
880
881 if (itt == ~0U) {
882 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
883
884 switch(opcode) {
885 case ISCSI_OP_NOOP_IN:
886 if (datalen) {
887 rc = ISCSI_ERR_PROTO;
888 break;
889 }
890
891 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
892 break;
893
894 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
895 break;
896 case ISCSI_OP_REJECT:
897 rc = iscsi_handle_reject(conn, hdr, data, datalen);
898 break;
899 case ISCSI_OP_ASYNC_EVENT:
900 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
901 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
902 rc = ISCSI_ERR_CONN_FAILED;
903 break;
904 default:
905 rc = ISCSI_ERR_BAD_OPCODE;
906 break;
907 }
908 goto out;
909 }
910
911 switch(opcode) {
912 case ISCSI_OP_SCSI_CMD_RSP:
913 case ISCSI_OP_SCSI_DATA_IN:
914 task = iscsi_itt_to_ctask(conn, hdr->itt);
915 if (!task)
916 return ISCSI_ERR_BAD_ITT;
917 break;
918 case ISCSI_OP_R2T:
919 /*
920 * LLD handles R2Ts if they need to.
921 */
922 return 0;
923 case ISCSI_OP_LOGOUT_RSP:
924 case ISCSI_OP_LOGIN_RSP:
925 case ISCSI_OP_TEXT_RSP:
926 case ISCSI_OP_SCSI_TMFUNC_RSP:
927 case ISCSI_OP_NOOP_IN:
928 task = iscsi_itt_to_task(conn, hdr->itt);
929 if (!task)
930 return ISCSI_ERR_BAD_ITT;
931 break;
932 default:
933 return ISCSI_ERR_BAD_OPCODE;
934 }
935
936 switch(opcode) {
937 case ISCSI_OP_SCSI_CMD_RSP:
938 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
939 break;
940 case ISCSI_OP_SCSI_DATA_IN:
941 iscsi_data_in_rsp(conn, hdr, task);
942 break;
943 case ISCSI_OP_LOGOUT_RSP:
944 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
945 if (datalen) {
946 rc = ISCSI_ERR_PROTO;
947 break;
948 }
949 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
950 goto recv_pdu;
951 case ISCSI_OP_LOGIN_RSP:
952 case ISCSI_OP_TEXT_RSP:
953 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
954 /*
955 * login related PDU's exp_statsn is handled in
956 * userspace
957 */
958 goto recv_pdu;
959 case ISCSI_OP_SCSI_TMFUNC_RSP:
960 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
961 if (datalen) {
962 rc = ISCSI_ERR_PROTO;
963 break;
964 }
965
966 iscsi_tmf_rsp(conn, hdr);
967 __iscsi_put_task(task);
968 break;
969 case ISCSI_OP_NOOP_IN:
970 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
971 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
972 rc = ISCSI_ERR_PROTO;
973 break;
974 }
975 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
976
977 if (conn->ping_task != task)
978 /*
979 * If this is not in response to one of our
980 * nops then it must be from userspace.
981 */
982 goto recv_pdu;
983
984 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
985 __iscsi_put_task(task);
986 break;
987 default:
988 rc = ISCSI_ERR_BAD_OPCODE;
989 break;
990 }
991
992out:
993 return rc;
994recv_pdu:
995 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
996 rc = ISCSI_ERR_CONN_FAILED;
997 __iscsi_put_task(task);
998 return rc;
999}
1000EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1001
1002int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1003 char *data, int datalen)
1004{
1005 int rc;
1006
1007 spin_lock(&conn->session->lock);
1008 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1009 spin_unlock(&conn->session->lock);
1010 return rc;
1011}
1012EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1013
1014int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1015{
1016 struct iscsi_session *session = conn->session;
1017 int age = 0, i = 0;
1018
1019 if (itt == RESERVED_ITT)
1020 return 0;
1021
1022 if (session->tt->parse_pdu_itt)
1023 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1024 else {
1025 i = get_itt(itt);
1026 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1027 }
1028
1029 if (age != session->age) {
1030 iscsi_conn_printk(KERN_ERR, conn,
1031 "received itt %x expected session age (%x)\n",
1032 (__force u32)itt, session->age);
1033 return ISCSI_ERR_BAD_ITT;
1034 }
1035
1036 if (i >= session->cmds_max) {
1037 iscsi_conn_printk(KERN_ERR, conn,
1038 "received invalid itt index %u (max cmds "
1039 "%u.\n", i, session->cmds_max);
1040 return ISCSI_ERR_BAD_ITT;
1041 }
1042 return 0;
1043}
1044EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1045
1046/**
1047 * iscsi_itt_to_ctask - look up ctask by itt
1048 * @conn: iscsi connection
1049 * @itt: itt
1050 *
1051 * This should be used for cmd tasks.
1052 *
1053 * The session lock must be held.
1054 */
1055struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1056{
1057 struct iscsi_task *task;
1058
1059 if (iscsi_verify_itt(conn, itt))
1060 return NULL;
1061
1062 task = iscsi_itt_to_task(conn, itt);
1063 if (!task || !task->sc)
1064 return NULL;
1065
1066 if (task->sc->SCp.phase != conn->session->age) {
1067 iscsi_session_printk(KERN_ERR, conn->session,
1068 "task's session age %d, expected %d\n",
1069 task->sc->SCp.phase, conn->session->age);
1070 return NULL;
1071 }
1072
1073 return task;
1074}
1075EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1076
1077void iscsi_session_failure(struct iscsi_session *session,
1078 enum iscsi_err err)
1079{
1080 struct iscsi_conn *conn;
1081 struct device *dev;
1082 unsigned long flags;
1083
1084 spin_lock_irqsave(&session->lock, flags);
1085 conn = session->leadconn;
1086 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1087 spin_unlock_irqrestore(&session->lock, flags);
1088 return;
1089 }
1090
1091 dev = get_device(&conn->cls_conn->dev);
1092 spin_unlock_irqrestore(&session->lock, flags);
1093 if (!dev)
1094 return;
1095 /*
1096 * if the host is being removed bypass the connection
1097 * recovery initialization because we are going to kill
1098 * the session.
1099 */
1100 if (err == ISCSI_ERR_INVALID_HOST)
1101 iscsi_conn_error_event(conn->cls_conn, err);
1102 else
1103 iscsi_conn_failure(conn, err);
1104 put_device(dev);
1105}
1106EXPORT_SYMBOL_GPL(iscsi_session_failure);
1107
1108void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1109{
1110 struct iscsi_session *session = conn->session;
1111 unsigned long flags;
1112
1113 spin_lock_irqsave(&session->lock, flags);
1114 if (session->state == ISCSI_STATE_FAILED) {
1115 spin_unlock_irqrestore(&session->lock, flags);
1116 return;
1117 }
1118
1119 if (conn->stop_stage == 0)
1120 session->state = ISCSI_STATE_FAILED;
1121 spin_unlock_irqrestore(&session->lock, flags);
1122
1123 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1124 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1125 iscsi_conn_error_event(conn->cls_conn, err);
1126}
1127EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1128
1129static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1130{
1131 struct iscsi_session *session = conn->session;
1132
1133 /*
1134 * Check for iSCSI window and take care of CmdSN wrap-around
1135 */
1136 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1137 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1138 "%u MaxCmdSN %u CmdSN %u/%u\n",
1139 session->exp_cmdsn, session->max_cmdsn,
1140 session->cmdsn, session->queued_cmdsn);
1141 return -ENOSPC;
1142 }
1143 return 0;
1144}
1145
1146static int iscsi_xmit_task(struct iscsi_conn *conn)
1147{
1148 struct iscsi_task *task = conn->task;
1149 int rc;
1150
1151 __iscsi_get_task(task);
1152 spin_unlock_bh(&conn->session->lock);
1153 rc = conn->session->tt->xmit_task(task);
1154 spin_lock_bh(&conn->session->lock);
1155 __iscsi_put_task(task);
1156 if (!rc)
1157 /* done with this task */
1158 conn->task = NULL;
1159 return rc;
1160}
1161
1162/**
1163 * iscsi_requeue_task - requeue task to run from session workqueue
1164 * @task: task to requeue
1165 *
1166 * LLDs that need to run a task from the session workqueue should call
1167 * this. The session lock must be held. This should only be called
1168 * by software drivers.
1169 */
1170void iscsi_requeue_task(struct iscsi_task *task)
1171{
1172 struct iscsi_conn *conn = task->conn;
1173
1174 list_move_tail(&task->running, &conn->requeue);
1175 iscsi_conn_queue_work(conn);
1176}
1177EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1178
1179/**
1180 * iscsi_data_xmit - xmit any command into the scheduled connection
1181 * @conn: iscsi connection
1182 *
1183 * Notes:
1184 * The function can return -EAGAIN in which case the caller must
1185 * re-schedule it again later or recover. '0' return code means
1186 * successful xmit.
1187 **/
1188static int iscsi_data_xmit(struct iscsi_conn *conn)
1189{
1190 int rc = 0;
1191
1192 spin_lock_bh(&conn->session->lock);
1193 if (unlikely(conn->suspend_tx)) {
1194 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1195 spin_unlock_bh(&conn->session->lock);
1196 return -ENODATA;
1197 }
1198
1199 if (conn->task) {
1200 rc = iscsi_xmit_task(conn);
1201 if (rc)
1202 goto again;
1203 }
1204
1205 /*
1206 * process mgmt pdus like nops before commands since we should
1207 * only have one nop-out as a ping from us and targets should not
1208 * overflow us with nop-ins
1209 */
1210check_mgmt:
1211 while (!list_empty(&conn->mgmtqueue)) {
1212 conn->task = list_entry(conn->mgmtqueue.next,
1213 struct iscsi_task, running);
1214 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1215 __iscsi_put_task(conn->task);
1216 conn->task = NULL;
1217 continue;
1218 }
1219 rc = iscsi_xmit_task(conn);
1220 if (rc)
1221 goto again;
1222 }
1223
1224 /* process pending command queue */
1225 while (!list_empty(&conn->xmitqueue)) {
1226 if (conn->tmf_state == TMF_QUEUED)
1227 break;
1228
1229 conn->task = list_entry(conn->xmitqueue.next,
1230 struct iscsi_task, running);
1231 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1232 fail_command(conn, conn->task, DID_IMM_RETRY << 16);
1233 continue;
1234 }
1235 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1236 if (rc) {
1237 if (rc == -ENOMEM) {
1238 conn->task = NULL;
1239 goto again;
1240 } else
1241 fail_command(conn, conn->task, DID_ABORT << 16);
1242 continue;
1243 }
1244 rc = iscsi_xmit_task(conn);
1245 if (rc)
1246 goto again;
1247 /*
1248 * we could continuously get new task requests so
1249 * we need to check the mgmt queue for nops that need to
1250 * be sent to aviod starvation
1251 */
1252 if (!list_empty(&conn->mgmtqueue))
1253 goto check_mgmt;
1254 }
1255
1256 while (!list_empty(&conn->requeue)) {
1257 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1258 break;
1259
1260 /*
1261 * we always do fastlogout - conn stop code will clean up.
1262 */
1263 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1264 break;
1265
1266 conn->task = list_entry(conn->requeue.next,
1267 struct iscsi_task, running);
1268 conn->task->state = ISCSI_TASK_RUNNING;
1269 list_move_tail(conn->requeue.next, &conn->run_list);
1270 rc = iscsi_xmit_task(conn);
1271 if (rc)
1272 goto again;
1273 if (!list_empty(&conn->mgmtqueue))
1274 goto check_mgmt;
1275 }
1276 spin_unlock_bh(&conn->session->lock);
1277 return -ENODATA;
1278
1279again:
1280 if (unlikely(conn->suspend_tx))
1281 rc = -ENODATA;
1282 spin_unlock_bh(&conn->session->lock);
1283 return rc;
1284}
1285
1286static void iscsi_xmitworker(struct work_struct *work)
1287{
1288 struct iscsi_conn *conn =
1289 container_of(work, struct iscsi_conn, xmitwork);
1290 int rc;
1291 /*
1292 * serialize Xmit worker on a per-connection basis.
1293 */
1294 do {
1295 rc = iscsi_data_xmit(conn);
1296 } while (rc >= 0 || rc == -EAGAIN);
1297}
1298
1299static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1300 struct scsi_cmnd *sc)
1301{
1302 struct iscsi_task *task;
1303
1304 if (!__kfifo_get(conn->session->cmdpool.queue,
1305 (void *) &task, sizeof(void *)))
1306 return NULL;
1307
1308 sc->SCp.phase = conn->session->age;
1309 sc->SCp.ptr = (char *) task;
1310
1311 atomic_set(&task->refcount, 1);
1312 task->state = ISCSI_TASK_PENDING;
1313 task->conn = conn;
1314 task->sc = sc;
1315 INIT_LIST_HEAD(&task->running);
1316 return task;
1317}
1318
1319enum {
1320 FAILURE_BAD_HOST = 1,
1321 FAILURE_SESSION_FAILED,
1322 FAILURE_SESSION_FREED,
1323 FAILURE_WINDOW_CLOSED,
1324 FAILURE_OOM,
1325 FAILURE_SESSION_TERMINATE,
1326 FAILURE_SESSION_IN_RECOVERY,
1327 FAILURE_SESSION_RECOVERY_TIMEOUT,
1328 FAILURE_SESSION_LOGGING_OUT,
1329 FAILURE_SESSION_NOT_READY,
1330};
1331
1332int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1333{
1334 struct iscsi_cls_session *cls_session;
1335 struct Scsi_Host *host;
1336 int reason = 0;
1337 struct iscsi_session *session;
1338 struct iscsi_conn *conn;
1339 struct iscsi_task *task = NULL;
1340
1341 sc->scsi_done = done;
1342 sc->result = 0;
1343 sc->SCp.ptr = NULL;
1344
1345 host = sc->device->host;
1346 spin_unlock(host->host_lock);
1347
1348 cls_session = starget_to_session(scsi_target(sc->device));
1349 session = cls_session->dd_data;
1350 spin_lock(&session->lock);
1351
1352 reason = iscsi_session_chkready(cls_session);
1353 if (reason) {
1354 sc->result = reason;
1355 goto fault;
1356 }
1357
1358 /*
1359 * ISCSI_STATE_FAILED is a temp. state. The recovery
1360 * code will decide what is best to do with command queued
1361 * during this time
1362 */
1363 if (session->state != ISCSI_STATE_LOGGED_IN &&
1364 session->state != ISCSI_STATE_FAILED) {
1365 /*
1366 * to handle the race between when we set the recovery state
1367 * and block the session we requeue here (commands could
1368 * be entering our queuecommand while a block is starting
1369 * up because the block code is not locked)
1370 */
1371 switch (session->state) {
1372 case ISCSI_STATE_IN_RECOVERY:
1373 reason = FAILURE_SESSION_IN_RECOVERY;
1374 goto reject;
1375 case ISCSI_STATE_LOGGING_OUT:
1376 reason = FAILURE_SESSION_LOGGING_OUT;
1377 goto reject;
1378 case ISCSI_STATE_RECOVERY_FAILED:
1379 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1380 sc->result = DID_TRANSPORT_FAILFAST << 16;
1381 break;
1382 case ISCSI_STATE_TERMINATE:
1383 reason = FAILURE_SESSION_TERMINATE;
1384 sc->result = DID_NO_CONNECT << 16;
1385 break;
1386 default:
1387 reason = FAILURE_SESSION_FREED;
1388 sc->result = DID_NO_CONNECT << 16;
1389 }
1390 goto fault;
1391 }
1392
1393 conn = session->leadconn;
1394 if (!conn) {
1395 reason = FAILURE_SESSION_FREED;
1396 sc->result = DID_NO_CONNECT << 16;
1397 goto fault;
1398 }
1399
1400 if (iscsi_check_cmdsn_window_closed(conn)) {
1401 reason = FAILURE_WINDOW_CLOSED;
1402 goto reject;
1403 }
1404
1405 task = iscsi_alloc_task(conn, sc);
1406 if (!task) {
1407 reason = FAILURE_OOM;
1408 goto reject;
1409 }
1410 list_add_tail(&task->running, &conn->xmitqueue);
1411
1412 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
1413 reason = iscsi_prep_scsi_cmd_pdu(task);
1414 if (reason) {
1415 if (reason == -ENOMEM) {
1416 reason = FAILURE_OOM;
1417 goto prepd_reject;
1418 } else {
1419 sc->result = DID_ABORT << 16;
1420 goto prepd_fault;
1421 }
1422 }
1423 if (session->tt->xmit_task(task)) {
1424 reason = FAILURE_SESSION_NOT_READY;
1425 goto prepd_reject;
1426 }
1427 } else
1428 iscsi_conn_queue_work(conn);
1429
1430 session->queued_cmdsn++;
1431 spin_unlock(&session->lock);
1432 spin_lock(host->host_lock);
1433 return 0;
1434
1435prepd_reject:
1436 sc->scsi_done = NULL;
1437 iscsi_complete_command(task);
1438reject:
1439 spin_unlock(&session->lock);
1440 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1441 sc->cmnd[0], reason);
1442 spin_lock(host->host_lock);
1443 return SCSI_MLQUEUE_TARGET_BUSY;
1444
1445prepd_fault:
1446 sc->scsi_done = NULL;
1447 iscsi_complete_command(task);
1448fault:
1449 spin_unlock(&session->lock);
1450 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1451 sc->cmnd[0], reason);
1452 if (!scsi_bidi_cmnd(sc))
1453 scsi_set_resid(sc, scsi_bufflen(sc));
1454 else {
1455 scsi_out(sc)->resid = scsi_out(sc)->length;
1456 scsi_in(sc)->resid = scsi_in(sc)->length;
1457 }
1458 done(sc);
1459 spin_lock(host->host_lock);
1460 return 0;
1461}
1462EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1463
1464int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1465{
1466 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1467 return sdev->queue_depth;
1468}
1469EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1470
1471int iscsi_target_alloc(struct scsi_target *starget)
1472{
1473 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1474 struct iscsi_session *session = cls_session->dd_data;
1475
1476 starget->can_queue = session->scsi_cmds_max;
1477 return 0;
1478}
1479EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1480
1481void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1482{
1483 struct iscsi_session *session = cls_session->dd_data;
1484
1485 spin_lock_bh(&session->lock);
1486 if (session->state != ISCSI_STATE_LOGGED_IN) {
1487 session->state = ISCSI_STATE_RECOVERY_FAILED;
1488 if (session->leadconn)
1489 wake_up(&session->leadconn->ehwait);
1490 }
1491 spin_unlock_bh(&session->lock);
1492}
1493EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1494
1495int iscsi_eh_target_reset(struct scsi_cmnd *sc)
1496{
1497 struct iscsi_cls_session *cls_session;
1498 struct iscsi_session *session;
1499 struct iscsi_conn *conn;
1500
1501 cls_session = starget_to_session(scsi_target(sc->device));
1502 session = cls_session->dd_data;
1503 conn = session->leadconn;
1504
1505 mutex_lock(&session->eh_mutex);
1506 spin_lock_bh(&session->lock);
1507 if (session->state == ISCSI_STATE_TERMINATE) {
1508failed:
1509 iscsi_session_printk(KERN_INFO, session,
1510 "failing target reset: Could not log "
1511 "back into target [age %d]\n",
1512 session->age);
1513 spin_unlock_bh(&session->lock);
1514 mutex_unlock(&session->eh_mutex);
1515 return FAILED;
1516 }
1517
1518 spin_unlock_bh(&session->lock);
1519 mutex_unlock(&session->eh_mutex);
1520 /*
1521 * we drop the lock here but the leadconn cannot be destoyed while
1522 * we are in the scsi eh
1523 */
1524 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1525
1526 ISCSI_DBG_SESSION(session, "wait for relogin\n");
1527 wait_event_interruptible(conn->ehwait,
1528 session->state == ISCSI_STATE_TERMINATE ||
1529 session->state == ISCSI_STATE_LOGGED_IN ||
1530 session->state == ISCSI_STATE_RECOVERY_FAILED);
1531 if (signal_pending(current))
1532 flush_signals(current);
1533
1534 mutex_lock(&session->eh_mutex);
1535 spin_lock_bh(&session->lock);
1536 if (session->state == ISCSI_STATE_LOGGED_IN)
1537 iscsi_session_printk(KERN_INFO, session,
1538 "target reset succeeded\n");
1539 else
1540 goto failed;
1541 spin_unlock_bh(&session->lock);
1542 mutex_unlock(&session->eh_mutex);
1543 return SUCCESS;
1544}
1545EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
1546
1547static void iscsi_tmf_timedout(unsigned long data)
1548{
1549 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1550 struct iscsi_session *session = conn->session;
1551
1552 spin_lock(&session->lock);
1553 if (conn->tmf_state == TMF_QUEUED) {
1554 conn->tmf_state = TMF_TIMEDOUT;
1555 ISCSI_DBG_SESSION(session, "tmf timedout\n");
1556 /* unblock eh_abort() */
1557 wake_up(&conn->ehwait);
1558 }
1559 spin_unlock(&session->lock);
1560}
1561
1562static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1563 struct iscsi_tm *hdr, int age,
1564 int timeout)
1565{
1566 struct iscsi_session *session = conn->session;
1567 struct iscsi_task *task;
1568
1569 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1570 NULL, 0);
1571 if (!task) {
1572 spin_unlock_bh(&session->lock);
1573 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1574 spin_lock_bh(&session->lock);
1575 ISCSI_DBG_SESSION(session, "tmf exec failure\n");
1576 return -EPERM;
1577 }
1578 conn->tmfcmd_pdus_cnt++;
1579 conn->tmf_timer.expires = timeout * HZ + jiffies;
1580 conn->tmf_timer.function = iscsi_tmf_timedout;
1581 conn->tmf_timer.data = (unsigned long)conn;
1582 add_timer(&conn->tmf_timer);
1583 ISCSI_DBG_SESSION(session, "tmf set timeout\n");
1584
1585 spin_unlock_bh(&session->lock);
1586 mutex_unlock(&session->eh_mutex);
1587
1588 /*
1589 * block eh thread until:
1590 *
1591 * 1) tmf response
1592 * 2) tmf timeout
1593 * 3) session is terminated or restarted or userspace has
1594 * given up on recovery
1595 */
1596 wait_event_interruptible(conn->ehwait, age != session->age ||
1597 session->state != ISCSI_STATE_LOGGED_IN ||
1598 conn->tmf_state != TMF_QUEUED);
1599 if (signal_pending(current))
1600 flush_signals(current);
1601 del_timer_sync(&conn->tmf_timer);
1602
1603 mutex_lock(&session->eh_mutex);
1604 spin_lock_bh(&session->lock);
1605 /* if the session drops it will clean up the task */
1606 if (age != session->age ||
1607 session->state != ISCSI_STATE_LOGGED_IN)
1608 return -ENOTCONN;
1609 return 0;
1610}
1611
1612/*
1613 * Fail commands. session lock held and recv side suspended and xmit
1614 * thread flushed
1615 */
1616static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1617 int error)
1618{
1619 struct iscsi_task *task, *tmp;
1620
1621 if (conn->task) {
1622 if (lun == -1 ||
1623 (conn->task->sc && conn->task->sc->device->lun == lun))
1624 conn->task = NULL;
1625 }
1626
1627 /* flush pending */
1628 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1629 if (lun == task->sc->device->lun || lun == -1) {
1630 ISCSI_DBG_SESSION(conn->session,
1631 "failing pending sc %p itt 0x%x\n",
1632 task->sc, task->itt);
1633 fail_command(conn, task, error << 16);
1634 }
1635 }
1636
1637 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1638 if (lun == task->sc->device->lun || lun == -1) {
1639 ISCSI_DBG_SESSION(conn->session,
1640 "failing requeued sc %p itt 0x%x\n",
1641 task->sc, task->itt);
1642 fail_command(conn, task, error << 16);
1643 }
1644 }
1645
1646 /* fail all other running */
1647 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1648 if (lun == task->sc->device->lun || lun == -1) {
1649 ISCSI_DBG_SESSION(conn->session,
1650 "failing in progress sc %p itt 0x%x\n",
1651 task->sc, task->itt);
1652 fail_command(conn, task, error << 16);
1653 }
1654 }
1655}
1656
1657void iscsi_suspend_tx(struct iscsi_conn *conn)
1658{
1659 struct Scsi_Host *shost = conn->session->host;
1660 struct iscsi_host *ihost = shost_priv(shost);
1661
1662 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1663 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1664 flush_workqueue(ihost->workq);
1665}
1666EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
1667
1668static void iscsi_start_tx(struct iscsi_conn *conn)
1669{
1670 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1671 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1672 iscsi_conn_queue_work(conn);
1673}
1674
1675static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1676{
1677 struct iscsi_cls_session *cls_session;
1678 struct iscsi_session *session;
1679 struct iscsi_conn *conn;
1680 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1681
1682 cls_session = starget_to_session(scsi_target(scmd->device));
1683 session = cls_session->dd_data;
1684
1685 ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd);
1686
1687 spin_lock(&session->lock);
1688 if (session->state != ISCSI_STATE_LOGGED_IN) {
1689 /*
1690 * We are probably in the middle of iscsi recovery so let
1691 * that complete and handle the error.
1692 */
1693 rc = BLK_EH_RESET_TIMER;
1694 goto done;
1695 }
1696
1697 conn = session->leadconn;
1698 if (!conn) {
1699 /* In the middle of shuting down */
1700 rc = BLK_EH_RESET_TIMER;
1701 goto done;
1702 }
1703
1704 if (!conn->recv_timeout && !conn->ping_timeout)
1705 goto done;
1706 /*
1707 * if the ping timedout then we are in the middle of cleaning up
1708 * and can let the iscsi eh handle it
1709 */
1710 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1711 (conn->ping_timeout * HZ), jiffies))
1712 rc = BLK_EH_RESET_TIMER;
1713 /*
1714 * if we are about to check the transport then give the command
1715 * more time
1716 */
1717 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1718 jiffies))
1719 rc = BLK_EH_RESET_TIMER;
1720 /* if in the middle of checking the transport then give us more time */
1721 if (conn->ping_task)
1722 rc = BLK_EH_RESET_TIMER;
1723done:
1724 spin_unlock(&session->lock);
1725 ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
1726 "timer reset" : "nh");
1727 return rc;
1728}
1729
1730static void iscsi_check_transport_timeouts(unsigned long data)
1731{
1732 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1733 struct iscsi_session *session = conn->session;
1734 unsigned long recv_timeout, next_timeout = 0, last_recv;
1735
1736 spin_lock(&session->lock);
1737 if (session->state != ISCSI_STATE_LOGGED_IN)
1738 goto done;
1739
1740 recv_timeout = conn->recv_timeout;
1741 if (!recv_timeout)
1742 goto done;
1743
1744 recv_timeout *= HZ;
1745 last_recv = conn->last_recv;
1746 if (conn->ping_task &&
1747 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
1748 jiffies)) {
1749 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1750 "expired, last rx %lu, last ping %lu, "
1751 "now %lu\n", conn->ping_timeout, last_recv,
1752 conn->last_ping, jiffies);
1753 spin_unlock(&session->lock);
1754 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1755 return;
1756 }
1757
1758 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
1759 /* send a ping to try to provoke some traffic */
1760 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
1761 iscsi_send_nopout(conn, NULL);
1762 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
1763 } else
1764 next_timeout = last_recv + recv_timeout;
1765
1766 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
1767 mod_timer(&conn->transport_timer, next_timeout);
1768done:
1769 spin_unlock(&session->lock);
1770}
1771
1772static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
1773 struct iscsi_tm *hdr)
1774{
1775 memset(hdr, 0, sizeof(*hdr));
1776 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1777 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1778 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1779 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
1780 hdr->rtt = task->hdr_itt;
1781 hdr->refcmdsn = task->cmdsn;
1782}
1783
1784int iscsi_eh_abort(struct scsi_cmnd *sc)
1785{
1786 struct iscsi_cls_session *cls_session;
1787 struct iscsi_session *session;
1788 struct iscsi_conn *conn;
1789 struct iscsi_task *task;
1790 struct iscsi_tm *hdr;
1791 int rc, age;
1792
1793 cls_session = starget_to_session(scsi_target(sc->device));
1794 session = cls_session->dd_data;
1795
1796 mutex_lock(&session->eh_mutex);
1797 spin_lock_bh(&session->lock);
1798 /*
1799 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1800 * got the command.
1801 */
1802 if (!sc->SCp.ptr) {
1803 ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or "
1804 "it completed.\n");
1805 spin_unlock_bh(&session->lock);
1806 mutex_unlock(&session->eh_mutex);
1807 return SUCCESS;
1808 }
1809
1810 /*
1811 * If we are not logged in or we have started a new session
1812 * then let the host reset code handle this
1813 */
1814 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1815 sc->SCp.phase != session->age) {
1816 spin_unlock_bh(&session->lock);
1817 mutex_unlock(&session->eh_mutex);
1818 return FAILED;
1819 }
1820
1821 conn = session->leadconn;
1822 conn->eh_abort_cnt++;
1823 age = session->age;
1824
1825 task = (struct iscsi_task *)sc->SCp.ptr;
1826 ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n",
1827 sc, task->itt);
1828
1829 /* task completed before time out */
1830 if (!task->sc) {
1831 ISCSI_DBG_SESSION(session, "sc completed while abort in "
1832 "progress\n");
1833 goto success;
1834 }
1835
1836 if (task->state == ISCSI_TASK_PENDING) {
1837 fail_command(conn, task, DID_ABORT << 16);
1838 goto success;
1839 }
1840
1841 /* only have one tmf outstanding at a time */
1842 if (conn->tmf_state != TMF_INITIAL)
1843 goto failed;
1844 conn->tmf_state = TMF_QUEUED;
1845
1846 hdr = &conn->tmhdr;
1847 iscsi_prep_abort_task_pdu(task, hdr);
1848
1849 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1850 rc = FAILED;
1851 goto failed;
1852 }
1853
1854 switch (conn->tmf_state) {
1855 case TMF_SUCCESS:
1856 spin_unlock_bh(&session->lock);
1857 /*
1858 * stop tx side incase the target had sent a abort rsp but
1859 * the initiator was still writing out data.
1860 */
1861 iscsi_suspend_tx(conn);
1862 /*
1863 * we do not stop the recv side because targets have been
1864 * good and have never sent us a successful tmf response
1865 * then sent more data for the cmd.
1866 */
1867 spin_lock(&session->lock);
1868 fail_command(conn, task, DID_ABORT << 16);
1869 conn->tmf_state = TMF_INITIAL;
1870 spin_unlock(&session->lock);
1871 iscsi_start_tx(conn);
1872 goto success_unlocked;
1873 case TMF_TIMEDOUT:
1874 spin_unlock_bh(&session->lock);
1875 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1876 goto failed_unlocked;
1877 case TMF_NOT_FOUND:
1878 if (!sc->SCp.ptr) {
1879 conn->tmf_state = TMF_INITIAL;
1880 /* task completed before tmf abort response */
1881 ISCSI_DBG_SESSION(session, "sc completed while abort "
1882 "in progress\n");
1883 goto success;
1884 }
1885 /* fall through */
1886 default:
1887 conn->tmf_state = TMF_INITIAL;
1888 goto failed;
1889 }
1890
1891success:
1892 spin_unlock_bh(&session->lock);
1893success_unlocked:
1894 ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n",
1895 sc, task->itt);
1896 mutex_unlock(&session->eh_mutex);
1897 return SUCCESS;
1898
1899failed:
1900 spin_unlock_bh(&session->lock);
1901failed_unlocked:
1902 ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc,
1903 task ? task->itt : 0);
1904 mutex_unlock(&session->eh_mutex);
1905 return FAILED;
1906}
1907EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1908
1909static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1910{
1911 memset(hdr, 0, sizeof(*hdr));
1912 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1913 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1914 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1915 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1916 hdr->rtt = RESERVED_ITT;
1917}
1918
1919int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1920{
1921 struct iscsi_cls_session *cls_session;
1922 struct iscsi_session *session;
1923 struct iscsi_conn *conn;
1924 struct iscsi_tm *hdr;
1925 int rc = FAILED;
1926
1927 cls_session = starget_to_session(scsi_target(sc->device));
1928 session = cls_session->dd_data;
1929
1930 ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n",
1931 sc, sc->device->lun);
1932
1933 mutex_lock(&session->eh_mutex);
1934 spin_lock_bh(&session->lock);
1935 /*
1936 * Just check if we are not logged in. We cannot check for
1937 * the phase because the reset could come from a ioctl.
1938 */
1939 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1940 goto unlock;
1941 conn = session->leadconn;
1942
1943 /* only have one tmf outstanding at a time */
1944 if (conn->tmf_state != TMF_INITIAL)
1945 goto unlock;
1946 conn->tmf_state = TMF_QUEUED;
1947
1948 hdr = &conn->tmhdr;
1949 iscsi_prep_lun_reset_pdu(sc, hdr);
1950
1951 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1952 session->lu_reset_timeout)) {
1953 rc = FAILED;
1954 goto unlock;
1955 }
1956
1957 switch (conn->tmf_state) {
1958 case TMF_SUCCESS:
1959 break;
1960 case TMF_TIMEDOUT:
1961 spin_unlock_bh(&session->lock);
1962 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1963 goto done;
1964 default:
1965 conn->tmf_state = TMF_INITIAL;
1966 goto unlock;
1967 }
1968
1969 rc = SUCCESS;
1970 spin_unlock_bh(&session->lock);
1971
1972 iscsi_suspend_tx(conn);
1973
1974 spin_lock_bh(&session->lock);
1975 fail_all_commands(conn, sc->device->lun, DID_ERROR);
1976 conn->tmf_state = TMF_INITIAL;
1977 spin_unlock_bh(&session->lock);
1978
1979 iscsi_start_tx(conn);
1980 goto done;
1981
1982unlock:
1983 spin_unlock_bh(&session->lock);
1984done:
1985 ISCSI_DBG_SESSION(session, "dev reset result = %s\n",
1986 rc == SUCCESS ? "SUCCESS" : "FAILED");
1987 mutex_unlock(&session->eh_mutex);
1988 return rc;
1989}
1990EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1991
1992/*
1993 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1994 * should be accessed via kfifo_{get,put} on q->queue.
1995 * Optionally, the caller can obtain the array of object pointers
1996 * by passing in a non-NULL @items pointer
1997 */
1998int
1999iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2000{
2001 int i, num_arrays = 1;
2002
2003 memset(q, 0, sizeof(*q));
2004
2005 q->max = max;
2006
2007 /* If the user passed an items pointer, he wants a copy of
2008 * the array. */
2009 if (items)
2010 num_arrays++;
2011 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2012 if (q->pool == NULL)
2013 return -ENOMEM;
2014
2015 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2016 GFP_KERNEL, NULL);
2017 if (IS_ERR(q->queue)) {
2018 q->queue = NULL;
2019 goto enomem;
2020 }
2021
2022 for (i = 0; i < max; i++) {
2023 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2024 if (q->pool[i] == NULL) {
2025 q->max = i;
2026 goto enomem;
2027 }
2028 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2029 }
2030
2031 if (items) {
2032 *items = q->pool + max;
2033 memcpy(*items, q->pool, max * sizeof(void *));
2034 }
2035
2036 return 0;
2037
2038enomem:
2039 iscsi_pool_free(q);
2040 return -ENOMEM;
2041}
2042EXPORT_SYMBOL_GPL(iscsi_pool_init);
2043
2044void iscsi_pool_free(struct iscsi_pool *q)
2045{
2046 int i;
2047
2048 for (i = 0; i < q->max; i++)
2049 kfree(q->pool[i]);
2050 kfree(q->pool);
2051 kfree(q->queue);
2052}
2053EXPORT_SYMBOL_GPL(iscsi_pool_free);
2054
2055/**
2056 * iscsi_host_add - add host to system
2057 * @shost: scsi host
2058 * @pdev: parent device
2059 *
2060 * This should be called by partial offload and software iscsi drivers
2061 * to add a host to the system.
2062 */
2063int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2064{
2065 if (!shost->can_queue)
2066 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2067
2068 if (!shost->cmd_per_lun)
2069 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2070
2071 if (!shost->transportt->eh_timed_out)
2072 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
2073 return scsi_add_host(shost, pdev);
2074}
2075EXPORT_SYMBOL_GPL(iscsi_host_add);
2076
2077/**
2078 * iscsi_host_alloc - allocate a host and driver data
2079 * @sht: scsi host template
2080 * @dd_data_size: driver host data size
2081 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2082 *
2083 * This should be called by partial offload and software iscsi drivers.
2084 * To access the driver specific memory use the iscsi_host_priv() macro.
2085 */
2086struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
2087 int dd_data_size, bool xmit_can_sleep)
2088{
2089 struct Scsi_Host *shost;
2090 struct iscsi_host *ihost;
2091
2092 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2093 if (!shost)
2094 return NULL;
2095 ihost = shost_priv(shost);
2096
2097 if (xmit_can_sleep) {
2098 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2099 "iscsi_q_%d", shost->host_no);
2100 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2101 if (!ihost->workq)
2102 goto free_host;
2103 }
2104
2105 spin_lock_init(&ihost->lock);
2106 ihost->state = ISCSI_HOST_SETUP;
2107 ihost->num_sessions = 0;
2108 init_waitqueue_head(&ihost->session_removal_wq);
2109 return shost;
2110
2111free_host:
2112 scsi_host_put(shost);
2113 return NULL;
2114}
2115EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2116
2117static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2118{
2119 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2120}
2121
2122/**
2123 * iscsi_host_remove - remove host and sessions
2124 * @shost: scsi host
2125 *
2126 * If there are any sessions left, this will initiate the removal and wait
2127 * for the completion.
2128 */
2129void iscsi_host_remove(struct Scsi_Host *shost)
2130{
2131 struct iscsi_host *ihost = shost_priv(shost);
2132 unsigned long flags;
2133
2134 spin_lock_irqsave(&ihost->lock, flags);
2135 ihost->state = ISCSI_HOST_REMOVED;
2136 spin_unlock_irqrestore(&ihost->lock, flags);
2137
2138 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2139 wait_event_interruptible(ihost->session_removal_wq,
2140 ihost->num_sessions == 0);
2141 if (signal_pending(current))
2142 flush_signals(current);
2143
2144 scsi_remove_host(shost);
2145 if (ihost->workq)
2146 destroy_workqueue(ihost->workq);
2147}
2148EXPORT_SYMBOL_GPL(iscsi_host_remove);
2149
2150void iscsi_host_free(struct Scsi_Host *shost)
2151{
2152 struct iscsi_host *ihost = shost_priv(shost);
2153
2154 kfree(ihost->netdev);
2155 kfree(ihost->hwaddress);
2156 kfree(ihost->initiatorname);
2157 scsi_host_put(shost);
2158}
2159EXPORT_SYMBOL_GPL(iscsi_host_free);
2160
2161static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2162{
2163 struct iscsi_host *ihost = shost_priv(shost);
2164 unsigned long flags;
2165
2166 shost = scsi_host_get(shost);
2167 if (!shost) {
2168 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2169 "of session teardown event because host already "
2170 "removed.\n");
2171 return;
2172 }
2173
2174 spin_lock_irqsave(&ihost->lock, flags);
2175 ihost->num_sessions--;
2176 if (ihost->num_sessions == 0)
2177 wake_up(&ihost->session_removal_wq);
2178 spin_unlock_irqrestore(&ihost->lock, flags);
2179 scsi_host_put(shost);
2180}
2181
2182/**
2183 * iscsi_session_setup - create iscsi cls session and host and session
2184 * @iscsit: iscsi transport template
2185 * @shost: scsi host
2186 * @cmds_max: session can queue
2187 * @cmd_task_size: LLD task private data size
2188 * @initial_cmdsn: initial CmdSN
2189 *
2190 * This can be used by software iscsi_transports that allocate
2191 * a session per scsi host.
2192 *
2193 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2194 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2195 * for nop handling and login/logout requests.
2196 */
2197struct iscsi_cls_session *
2198iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
2199 uint16_t cmds_max, int cmd_task_size,
2200 uint32_t initial_cmdsn, unsigned int id)
2201{
2202 struct iscsi_host *ihost = shost_priv(shost);
2203 struct iscsi_session *session;
2204 struct iscsi_cls_session *cls_session;
2205 int cmd_i, scsi_cmds, total_cmds = cmds_max;
2206 unsigned long flags;
2207
2208 spin_lock_irqsave(&ihost->lock, flags);
2209 if (ihost->state == ISCSI_HOST_REMOVED) {
2210 spin_unlock_irqrestore(&ihost->lock, flags);
2211 return NULL;
2212 }
2213 ihost->num_sessions++;
2214 spin_unlock_irqrestore(&ihost->lock, flags);
2215
2216 if (!total_cmds)
2217 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2218 /*
2219 * The iscsi layer needs some tasks for nop handling and tmfs,
2220 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2221 * + 1 command for scsi IO.
2222 */
2223 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2224 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2225 "must be a power of two that is at least %d.\n",
2226 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2227 goto dec_session_count;
2228 }
2229
2230 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2231 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2232 "must be a power of 2 less than or equal to %d.\n",
2233 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2234 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2235 }
2236
2237 if (!is_power_of_2(total_cmds)) {
2238 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2239 "must be a power of 2.\n", total_cmds);
2240 total_cmds = rounddown_pow_of_two(total_cmds);
2241 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2242 return NULL;
2243 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2244 total_cmds);
2245 }
2246 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2247
2248 cls_session = iscsi_alloc_session(shost, iscsit,
2249 sizeof(struct iscsi_session));
2250 if (!cls_session)
2251 goto dec_session_count;
2252 session = cls_session->dd_data;
2253 session->cls_session = cls_session;
2254 session->host = shost;
2255 session->state = ISCSI_STATE_FREE;
2256 session->fast_abort = 1;
2257 session->lu_reset_timeout = 15;
2258 session->abort_timeout = 10;
2259 session->scsi_cmds_max = scsi_cmds;
2260 session->cmds_max = total_cmds;
2261 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
2262 session->exp_cmdsn = initial_cmdsn + 1;
2263 session->max_cmdsn = initial_cmdsn + 1;
2264 session->max_r2t = 1;
2265 session->tt = iscsit;
2266 mutex_init(&session->eh_mutex);
2267 spin_lock_init(&session->lock);
2268
2269 /* initialize SCSI PDU commands pool */
2270 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2271 (void***)&session->cmds,
2272 cmd_task_size + sizeof(struct iscsi_task)))
2273 goto cmdpool_alloc_fail;
2274
2275 /* pre-format cmds pool with ITT */
2276 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
2277 struct iscsi_task *task = session->cmds[cmd_i];
2278
2279 if (cmd_task_size)
2280 task->dd_data = &task[1];
2281 task->itt = cmd_i;
2282 INIT_LIST_HEAD(&task->running);
2283 }
2284
2285 if (!try_module_get(iscsit->owner))
2286 goto module_get_fail;
2287
2288 if (iscsi_add_session(cls_session, id))
2289 goto cls_session_fail;
2290
2291 return cls_session;
2292
2293cls_session_fail:
2294 module_put(iscsit->owner);
2295module_get_fail:
2296 iscsi_pool_free(&session->cmdpool);
2297cmdpool_alloc_fail:
2298 iscsi_free_session(cls_session);
2299dec_session_count:
2300 iscsi_host_dec_session_cnt(shost);
2301 return NULL;
2302}
2303EXPORT_SYMBOL_GPL(iscsi_session_setup);
2304
2305/**
2306 * iscsi_session_teardown - destroy session, host, and cls_session
2307 * @cls_session: iscsi session
2308 *
2309 * The driver must have called iscsi_remove_session before
2310 * calling this.
2311 */
2312void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2313{
2314 struct iscsi_session *session = cls_session->dd_data;
2315 struct module *owner = cls_session->transport->owner;
2316 struct Scsi_Host *shost = session->host;
2317
2318 iscsi_pool_free(&session->cmdpool);
2319
2320 kfree(session->password);
2321 kfree(session->password_in);
2322 kfree(session->username);
2323 kfree(session->username_in);
2324 kfree(session->targetname);
2325 kfree(session->initiatorname);
2326 kfree(session->ifacename);
2327
2328 iscsi_destroy_session(cls_session);
2329 iscsi_host_dec_session_cnt(shost);
2330 module_put(owner);
2331}
2332EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2333
2334/**
2335 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2336 * @cls_session: iscsi_cls_session
2337 * @dd_size: private driver data size
2338 * @conn_idx: cid
2339 */
2340struct iscsi_cls_conn *
2341iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2342 uint32_t conn_idx)
2343{
2344 struct iscsi_session *session = cls_session->dd_data;
2345 struct iscsi_conn *conn;
2346 struct iscsi_cls_conn *cls_conn;
2347 char *data;
2348
2349 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2350 conn_idx);
2351 if (!cls_conn)
2352 return NULL;
2353 conn = cls_conn->dd_data;
2354 memset(conn, 0, sizeof(*conn) + dd_size);
2355
2356 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
2357 conn->session = session;
2358 conn->cls_conn = cls_conn;
2359 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2360 conn->id = conn_idx;
2361 conn->exp_statsn = 0;
2362 conn->tmf_state = TMF_INITIAL;
2363
2364 init_timer(&conn->transport_timer);
2365 conn->transport_timer.data = (unsigned long)conn;
2366 conn->transport_timer.function = iscsi_check_transport_timeouts;
2367
2368 INIT_LIST_HEAD(&conn->run_list);
2369 INIT_LIST_HEAD(&conn->mgmt_run_list);
2370 INIT_LIST_HEAD(&conn->mgmtqueue);
2371 INIT_LIST_HEAD(&conn->xmitqueue);
2372 INIT_LIST_HEAD(&conn->requeue);
2373 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
2374
2375 /* allocate login_task used for the login/text sequences */
2376 spin_lock_bh(&session->lock);
2377 if (!__kfifo_get(session->cmdpool.queue,
2378 (void*)&conn->login_task,
2379 sizeof(void*))) {
2380 spin_unlock_bh(&session->lock);
2381 goto login_task_alloc_fail;
2382 }
2383 spin_unlock_bh(&session->lock);
2384
2385 data = (char *) __get_free_pages(GFP_KERNEL,
2386 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2387 if (!data)
2388 goto login_task_data_alloc_fail;
2389 conn->login_task->data = conn->data = data;
2390
2391 init_timer(&conn->tmf_timer);
2392 init_waitqueue_head(&conn->ehwait);
2393
2394 return cls_conn;
2395
2396login_task_data_alloc_fail:
2397 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2398 sizeof(void*));
2399login_task_alloc_fail:
2400 iscsi_destroy_conn(cls_conn);
2401 return NULL;
2402}
2403EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2404
2405/**
2406 * iscsi_conn_teardown - teardown iscsi connection
2407 * cls_conn: iscsi class connection
2408 *
2409 * TODO: we may need to make this into a two step process
2410 * like scsi-mls remove + put host
2411 */
2412void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2413{
2414 struct iscsi_conn *conn = cls_conn->dd_data;
2415 struct iscsi_session *session = conn->session;
2416 unsigned long flags;
2417
2418 del_timer_sync(&conn->transport_timer);
2419
2420 spin_lock_bh(&session->lock);
2421 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2422 if (session->leadconn == conn) {
2423 /*
2424 * leading connection? then give up on recovery.
2425 */
2426 session->state = ISCSI_STATE_TERMINATE;
2427 wake_up(&conn->ehwait);
2428 }
2429 spin_unlock_bh(&session->lock);
2430
2431 /*
2432 * Block until all in-progress commands for this connection
2433 * time out or fail.
2434 */
2435 for (;;) {
2436 spin_lock_irqsave(session->host->host_lock, flags);
2437 if (!session->host->host_busy) { /* OK for ERL == 0 */
2438 spin_unlock_irqrestore(session->host->host_lock, flags);
2439 break;
2440 }
2441 spin_unlock_irqrestore(session->host->host_lock, flags);
2442 msleep_interruptible(500);
2443 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2444 "host_busy %d host_failed %d\n",
2445 session->host->host_busy,
2446 session->host->host_failed);
2447 /*
2448 * force eh_abort() to unblock
2449 */
2450 wake_up(&conn->ehwait);
2451 }
2452
2453 /* flush queued up work because we free the connection below */
2454 iscsi_suspend_tx(conn);
2455
2456 spin_lock_bh(&session->lock);
2457 free_pages((unsigned long) conn->data,
2458 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
2459 kfree(conn->persistent_address);
2460 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
2461 sizeof(void*));
2462 if (session->leadconn == conn)
2463 session->leadconn = NULL;
2464 spin_unlock_bh(&session->lock);
2465
2466 iscsi_destroy_conn(cls_conn);
2467}
2468EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2469
2470int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2471{
2472 struct iscsi_conn *conn = cls_conn->dd_data;
2473 struct iscsi_session *session = conn->session;
2474
2475 if (!session) {
2476 iscsi_conn_printk(KERN_ERR, conn,
2477 "can't start unbound connection\n");
2478 return -EPERM;
2479 }
2480
2481 if ((session->imm_data_en || !session->initial_r2t_en) &&
2482 session->first_burst > session->max_burst) {
2483 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2484 "first_burst %d max_burst %d\n",
2485 session->first_burst, session->max_burst);
2486 return -EINVAL;
2487 }
2488
2489 if (conn->ping_timeout && !conn->recv_timeout) {
2490 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2491 "zero. Using 5 seconds\n.");
2492 conn->recv_timeout = 5;
2493 }
2494
2495 if (conn->recv_timeout && !conn->ping_timeout) {
2496 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2497 "zero. Using 5 seconds.\n");
2498 conn->ping_timeout = 5;
2499 }
2500
2501 spin_lock_bh(&session->lock);
2502 conn->c_stage = ISCSI_CONN_STARTED;
2503 session->state = ISCSI_STATE_LOGGED_IN;
2504 session->queued_cmdsn = session->cmdsn;
2505
2506 conn->last_recv = jiffies;
2507 conn->last_ping = jiffies;
2508 if (conn->recv_timeout && conn->ping_timeout)
2509 mod_timer(&conn->transport_timer,
2510 jiffies + (conn->recv_timeout * HZ));
2511
2512 switch(conn->stop_stage) {
2513 case STOP_CONN_RECOVER:
2514 /*
2515 * unblock eh_abort() if it is blocked. re-try all
2516 * commands after successful recovery
2517 */
2518 conn->stop_stage = 0;
2519 conn->tmf_state = TMF_INITIAL;
2520 session->age++;
2521 if (session->age == 16)
2522 session->age = 0;
2523 break;
2524 case STOP_CONN_TERM:
2525 conn->stop_stage = 0;
2526 break;
2527 default:
2528 break;
2529 }
2530 spin_unlock_bh(&session->lock);
2531
2532 iscsi_unblock_session(session->cls_session);
2533 wake_up(&conn->ehwait);
2534 return 0;
2535}
2536EXPORT_SYMBOL_GPL(iscsi_conn_start);
2537
2538static void
2539flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2540{
2541 struct iscsi_task *task, *tmp;
2542
2543 /* handle pending */
2544 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2545 ISCSI_DBG_SESSION(session, "flushing pending mgmt task "
2546 "itt 0x%x\n", task->itt);
2547 /* release ref from prep task */
2548 __iscsi_put_task(task);
2549 }
2550
2551 /* handle running */
2552 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2553 ISCSI_DBG_SESSION(session, "flushing running mgmt task "
2554 "itt 0x%x\n", task->itt);
2555 /* release ref from prep task */
2556 __iscsi_put_task(task);
2557 }
2558
2559 conn->task = NULL;
2560}
2561
2562static void iscsi_start_session_recovery(struct iscsi_session *session,
2563 struct iscsi_conn *conn, int flag)
2564{
2565 int old_stop_stage;
2566
2567 del_timer_sync(&conn->transport_timer);
2568
2569 mutex_lock(&session->eh_mutex);
2570 spin_lock_bh(&session->lock);
2571 if (conn->stop_stage == STOP_CONN_TERM) {
2572 spin_unlock_bh(&session->lock);
2573 mutex_unlock(&session->eh_mutex);
2574 return;
2575 }
2576
2577 /*
2578 * When this is called for the in_login state, we only want to clean
2579 * up the login task and connection. We do not need to block and set
2580 * the recovery state again
2581 */
2582 if (flag == STOP_CONN_TERM)
2583 session->state = ISCSI_STATE_TERMINATE;
2584 else if (conn->stop_stage != STOP_CONN_RECOVER)
2585 session->state = ISCSI_STATE_IN_RECOVERY;
2586
2587 old_stop_stage = conn->stop_stage;
2588 conn->stop_stage = flag;
2589 conn->c_stage = ISCSI_CONN_STOPPED;
2590 spin_unlock_bh(&session->lock);
2591
2592 iscsi_suspend_tx(conn);
2593 /*
2594 * for connection level recovery we should not calculate
2595 * header digest. conn->hdr_size used for optimization
2596 * in hdr_extract() and will be re-negotiated at
2597 * set_param() time.
2598 */
2599 if (flag == STOP_CONN_RECOVER) {
2600 conn->hdrdgst_en = 0;
2601 conn->datadgst_en = 0;
2602 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2603 old_stop_stage != STOP_CONN_RECOVER) {
2604 ISCSI_DBG_SESSION(session, "blocking session\n");
2605 iscsi_block_session(session->cls_session);
2606 }
2607 }
2608
2609 /*
2610 * flush queues.
2611 */
2612 spin_lock_bh(&session->lock);
2613 if (flag == STOP_CONN_RECOVER)
2614 fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
2615 else
2616 fail_all_commands(conn, -1, DID_ERROR);
2617 flush_control_queues(session, conn);
2618 spin_unlock_bh(&session->lock);
2619 mutex_unlock(&session->eh_mutex);
2620}
2621
2622void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2623{
2624 struct iscsi_conn *conn = cls_conn->dd_data;
2625 struct iscsi_session *session = conn->session;
2626
2627 switch (flag) {
2628 case STOP_CONN_RECOVER:
2629 case STOP_CONN_TERM:
2630 iscsi_start_session_recovery(session, conn, flag);
2631 break;
2632 default:
2633 iscsi_conn_printk(KERN_ERR, conn,
2634 "invalid stop flag %d\n", flag);
2635 }
2636}
2637EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2638
2639int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2640 struct iscsi_cls_conn *cls_conn, int is_leading)
2641{
2642 struct iscsi_session *session = cls_session->dd_data;
2643 struct iscsi_conn *conn = cls_conn->dd_data;
2644
2645 spin_lock_bh(&session->lock);
2646 if (is_leading)
2647 session->leadconn = conn;
2648 spin_unlock_bh(&session->lock);
2649
2650 /*
2651 * Unblock xmitworker(), Login Phase will pass through.
2652 */
2653 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2654 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2655 return 0;
2656}
2657EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2658
2659
2660int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2661 enum iscsi_param param, char *buf, int buflen)
2662{
2663 struct iscsi_conn *conn = cls_conn->dd_data;
2664 struct iscsi_session *session = conn->session;
2665 uint32_t value;
2666
2667 switch(param) {
2668 case ISCSI_PARAM_FAST_ABORT:
2669 sscanf(buf, "%d", &session->fast_abort);
2670 break;
2671 case ISCSI_PARAM_ABORT_TMO:
2672 sscanf(buf, "%d", &session->abort_timeout);
2673 break;
2674 case ISCSI_PARAM_LU_RESET_TMO:
2675 sscanf(buf, "%d", &session->lu_reset_timeout);
2676 break;
2677 case ISCSI_PARAM_PING_TMO:
2678 sscanf(buf, "%d", &conn->ping_timeout);
2679 break;
2680 case ISCSI_PARAM_RECV_TMO:
2681 sscanf(buf, "%d", &conn->recv_timeout);
2682 break;
2683 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2684 sscanf(buf, "%d", &conn->max_recv_dlength);
2685 break;
2686 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2687 sscanf(buf, "%d", &conn->max_xmit_dlength);
2688 break;
2689 case ISCSI_PARAM_HDRDGST_EN:
2690 sscanf(buf, "%d", &conn->hdrdgst_en);
2691 break;
2692 case ISCSI_PARAM_DATADGST_EN:
2693 sscanf(buf, "%d", &conn->datadgst_en);
2694 break;
2695 case ISCSI_PARAM_INITIAL_R2T_EN:
2696 sscanf(buf, "%d", &session->initial_r2t_en);
2697 break;
2698 case ISCSI_PARAM_MAX_R2T:
2699 sscanf(buf, "%d", &session->max_r2t);
2700 break;
2701 case ISCSI_PARAM_IMM_DATA_EN:
2702 sscanf(buf, "%d", &session->imm_data_en);
2703 break;
2704 case ISCSI_PARAM_FIRST_BURST:
2705 sscanf(buf, "%d", &session->first_burst);
2706 break;
2707 case ISCSI_PARAM_MAX_BURST:
2708 sscanf(buf, "%d", &session->max_burst);
2709 break;
2710 case ISCSI_PARAM_PDU_INORDER_EN:
2711 sscanf(buf, "%d", &session->pdu_inorder_en);
2712 break;
2713 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2714 sscanf(buf, "%d", &session->dataseq_inorder_en);
2715 break;
2716 case ISCSI_PARAM_ERL:
2717 sscanf(buf, "%d", &session->erl);
2718 break;
2719 case ISCSI_PARAM_IFMARKER_EN:
2720 sscanf(buf, "%d", &value);
2721 BUG_ON(value);
2722 break;
2723 case ISCSI_PARAM_OFMARKER_EN:
2724 sscanf(buf, "%d", &value);
2725 BUG_ON(value);
2726 break;
2727 case ISCSI_PARAM_EXP_STATSN:
2728 sscanf(buf, "%u", &conn->exp_statsn);
2729 break;
2730 case ISCSI_PARAM_USERNAME:
2731 kfree(session->username);
2732 session->username = kstrdup(buf, GFP_KERNEL);
2733 if (!session->username)
2734 return -ENOMEM;
2735 break;
2736 case ISCSI_PARAM_USERNAME_IN:
2737 kfree(session->username_in);
2738 session->username_in = kstrdup(buf, GFP_KERNEL);
2739 if (!session->username_in)
2740 return -ENOMEM;
2741 break;
2742 case ISCSI_PARAM_PASSWORD:
2743 kfree(session->password);
2744 session->password = kstrdup(buf, GFP_KERNEL);
2745 if (!session->password)
2746 return -ENOMEM;
2747 break;
2748 case ISCSI_PARAM_PASSWORD_IN:
2749 kfree(session->password_in);
2750 session->password_in = kstrdup(buf, GFP_KERNEL);
2751 if (!session->password_in)
2752 return -ENOMEM;
2753 break;
2754 case ISCSI_PARAM_TARGET_NAME:
2755 /* this should not change between logins */
2756 if (session->targetname)
2757 break;
2758
2759 session->targetname = kstrdup(buf, GFP_KERNEL);
2760 if (!session->targetname)
2761 return -ENOMEM;
2762 break;
2763 case ISCSI_PARAM_TPGT:
2764 sscanf(buf, "%d", &session->tpgt);
2765 break;
2766 case ISCSI_PARAM_PERSISTENT_PORT:
2767 sscanf(buf, "%d", &conn->persistent_port);
2768 break;
2769 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2770 /*
2771 * this is the address returned in discovery so it should
2772 * not change between logins.
2773 */
2774 if (conn->persistent_address)
2775 break;
2776
2777 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2778 if (!conn->persistent_address)
2779 return -ENOMEM;
2780 break;
2781 case ISCSI_PARAM_IFACE_NAME:
2782 if (!session->ifacename)
2783 session->ifacename = kstrdup(buf, GFP_KERNEL);
2784 break;
2785 case ISCSI_PARAM_INITIATOR_NAME:
2786 if (!session->initiatorname)
2787 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2788 break;
2789 default:
2790 return -ENOSYS;
2791 }
2792
2793 return 0;
2794}
2795EXPORT_SYMBOL_GPL(iscsi_set_param);
2796
2797int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2798 enum iscsi_param param, char *buf)
2799{
2800 struct iscsi_session *session = cls_session->dd_data;
2801 int len;
2802
2803 switch(param) {
2804 case ISCSI_PARAM_FAST_ABORT:
2805 len = sprintf(buf, "%d\n", session->fast_abort);
2806 break;
2807 case ISCSI_PARAM_ABORT_TMO:
2808 len = sprintf(buf, "%d\n", session->abort_timeout);
2809 break;
2810 case ISCSI_PARAM_LU_RESET_TMO:
2811 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2812 break;
2813 case ISCSI_PARAM_INITIAL_R2T_EN:
2814 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2815 break;
2816 case ISCSI_PARAM_MAX_R2T:
2817 len = sprintf(buf, "%hu\n", session->max_r2t);
2818 break;
2819 case ISCSI_PARAM_IMM_DATA_EN:
2820 len = sprintf(buf, "%d\n", session->imm_data_en);
2821 break;
2822 case ISCSI_PARAM_FIRST_BURST:
2823 len = sprintf(buf, "%u\n", session->first_burst);
2824 break;
2825 case ISCSI_PARAM_MAX_BURST:
2826 len = sprintf(buf, "%u\n", session->max_burst);
2827 break;
2828 case ISCSI_PARAM_PDU_INORDER_EN:
2829 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2830 break;
2831 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2832 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2833 break;
2834 case ISCSI_PARAM_ERL:
2835 len = sprintf(buf, "%d\n", session->erl);
2836 break;
2837 case ISCSI_PARAM_TARGET_NAME:
2838 len = sprintf(buf, "%s\n", session->targetname);
2839 break;
2840 case ISCSI_PARAM_TPGT:
2841 len = sprintf(buf, "%d\n", session->tpgt);
2842 break;
2843 case ISCSI_PARAM_USERNAME:
2844 len = sprintf(buf, "%s\n", session->username);
2845 break;
2846 case ISCSI_PARAM_USERNAME_IN:
2847 len = sprintf(buf, "%s\n", session->username_in);
2848 break;
2849 case ISCSI_PARAM_PASSWORD:
2850 len = sprintf(buf, "%s\n", session->password);
2851 break;
2852 case ISCSI_PARAM_PASSWORD_IN:
2853 len = sprintf(buf, "%s\n", session->password_in);
2854 break;
2855 case ISCSI_PARAM_IFACE_NAME:
2856 len = sprintf(buf, "%s\n", session->ifacename);
2857 break;
2858 case ISCSI_PARAM_INITIATOR_NAME:
2859 if (!session->initiatorname)
2860 len = sprintf(buf, "%s\n", "unknown");
2861 else
2862 len = sprintf(buf, "%s\n", session->initiatorname);
2863 break;
2864 default:
2865 return -ENOSYS;
2866 }
2867
2868 return len;
2869}
2870EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2871
2872int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2873 enum iscsi_param param, char *buf)
2874{
2875 struct iscsi_conn *conn = cls_conn->dd_data;
2876 int len;
2877
2878 switch(param) {
2879 case ISCSI_PARAM_PING_TMO:
2880 len = sprintf(buf, "%u\n", conn->ping_timeout);
2881 break;
2882 case ISCSI_PARAM_RECV_TMO:
2883 len = sprintf(buf, "%u\n", conn->recv_timeout);
2884 break;
2885 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2886 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2887 break;
2888 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2889 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2890 break;
2891 case ISCSI_PARAM_HDRDGST_EN:
2892 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2893 break;
2894 case ISCSI_PARAM_DATADGST_EN:
2895 len = sprintf(buf, "%d\n", conn->datadgst_en);
2896 break;
2897 case ISCSI_PARAM_IFMARKER_EN:
2898 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2899 break;
2900 case ISCSI_PARAM_OFMARKER_EN:
2901 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2902 break;
2903 case ISCSI_PARAM_EXP_STATSN:
2904 len = sprintf(buf, "%u\n", conn->exp_statsn);
2905 break;
2906 case ISCSI_PARAM_PERSISTENT_PORT:
2907 len = sprintf(buf, "%d\n", conn->persistent_port);
2908 break;
2909 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2910 len = sprintf(buf, "%s\n", conn->persistent_address);
2911 break;
2912 default:
2913 return -ENOSYS;
2914 }
2915
2916 return len;
2917}
2918EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2919
2920int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2921 char *buf)
2922{
2923 struct iscsi_host *ihost = shost_priv(shost);
2924 int len;
2925
2926 switch (param) {
2927 case ISCSI_HOST_PARAM_NETDEV_NAME:
2928 if (!ihost->netdev)
2929 len = sprintf(buf, "%s\n", "default");
2930 else
2931 len = sprintf(buf, "%s\n", ihost->netdev);
2932 break;
2933 case ISCSI_HOST_PARAM_HWADDRESS:
2934 if (!ihost->hwaddress)
2935 len = sprintf(buf, "%s\n", "default");
2936 else
2937 len = sprintf(buf, "%s\n", ihost->hwaddress);
2938 break;
2939 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2940 if (!ihost->initiatorname)
2941 len = sprintf(buf, "%s\n", "unknown");
2942 else
2943 len = sprintf(buf, "%s\n", ihost->initiatorname);
2944 break;
2945 case ISCSI_HOST_PARAM_IPADDRESS:
2946 if (!strlen(ihost->local_address))
2947 len = sprintf(buf, "%s\n", "unknown");
2948 else
2949 len = sprintf(buf, "%s\n",
2950 ihost->local_address);
2951 break;
2952 default:
2953 return -ENOSYS;
2954 }
2955
2956 return len;
2957}
2958EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2959
2960int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2961 char *buf, int buflen)
2962{
2963 struct iscsi_host *ihost = shost_priv(shost);
2964
2965 switch (param) {
2966 case ISCSI_HOST_PARAM_NETDEV_NAME:
2967 if (!ihost->netdev)
2968 ihost->netdev = kstrdup(buf, GFP_KERNEL);
2969 break;
2970 case ISCSI_HOST_PARAM_HWADDRESS:
2971 if (!ihost->hwaddress)
2972 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
2973 break;
2974 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2975 if (!ihost->initiatorname)
2976 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
2977 break;
2978 default:
2979 return -ENOSYS;
2980 }
2981
2982 return 0;
2983}
2984EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2985
2986MODULE_AUTHOR("Mike Christie");
2987MODULE_DESCRIPTION("iSCSI library functions");
2988MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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