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scsi: libiscsi: Annotate locking assumptions
[linux-2.6-block.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 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>
7996a778
MC		 25#include <linux/kfifo.h>
26#include <linux/delay.h>
11836572 27#include <linux/log2.h>
5a0e3ad6 28#include <linux/slab.h>
3f07c014 29#include <linux/sched/signal.h>
acf3368f 30#include <linux/module.h>
8eb00539 31#include <asm/unaligned.h>
7996a778
MC		 32#include <net/tcp.h>
33#include <scsi/scsi_cmnd.h>
34#include <scsi/scsi_device.h>
35#include <scsi/scsi_eh.h>
36#include <scsi/scsi_tcq.h>
37#include <scsi/scsi_host.h>
38#include <scsi/scsi.h>
39#include <scsi/iscsi_proto.h>
40#include <scsi/scsi_transport.h>
41#include <scsi/scsi_transport_iscsi.h>
42#include <scsi/libiscsi.h>
43
bd2199d4
EZ		 44static int iscsi_dbg_lib_conn;
45module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
46 S_IRUGO | S_IWUSR);
47MODULE_PARM_DESC(debug_libiscsi_conn,
48 "Turn on debugging for connections in libiscsi module. "
49 "Set to 1 to turn on, and zero to turn off. Default is off.");
50
51static int iscsi_dbg_lib_session;
52module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
53 S_IRUGO | S_IWUSR);
54MODULE_PARM_DESC(debug_libiscsi_session,
55 "Turn on debugging for sessions in libiscsi module. "
56 "Set to 1 to turn on, and zero to turn off. Default is off.");
57
58static int iscsi_dbg_lib_eh;
59module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
60 S_IRUGO | S_IWUSR);
61MODULE_PARM_DESC(debug_libiscsi_eh,
62 "Turn on debugging for error handling in libiscsi module. "
63 "Set to 1 to turn on, and zero to turn off. Default is off.");
1b2c7af8
MC		 64
65#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
66 do { \
bd2199d4 67 if (iscsi_dbg_lib_conn) \
1b2c7af8
MC		 68 iscsi_conn_printk(KERN_INFO, _conn, \
69 "%s " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
74 do { \
bd2199d4
EZ		 75 if (iscsi_dbg_lib_session) \
76 iscsi_session_printk(KERN_INFO, _session, \
77 "%s " dbg_fmt, \
78 __func__, ##arg); \
79 } while (0);
80
81#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
82 do { \
83 if (iscsi_dbg_lib_eh) \
1b2c7af8
MC		 84 iscsi_session_printk(KERN_INFO, _session, \
85 "%s " dbg_fmt, \
86 __func__, ##arg); \
87 } while (0);
88
32ae763e
MC		 89inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
90{
91 struct Scsi_Host *shost = conn->session->host;
92 struct iscsi_host *ihost = shost_priv(shost);
93
1336aed1
MC		 94 if (ihost->workq)
95 queue_work(ihost->workq, &conn->xmitwork);
32ae763e
MC		 96}
97EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
98
4c0ba5d2
MC		 99static void __iscsi_update_cmdsn(struct iscsi_session *session,
100 uint32_t exp_cmdsn, uint32_t max_cmdsn)
7996a778 101{
77a23c21
MC		 102 /*
103 * standard specifies this check for when to update expected and
104 * max sequence numbers
105 */
106 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
107 return;
108
109 if (exp_cmdsn != session->exp_cmdsn &&
110 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 111 session->exp_cmdsn = exp_cmdsn;
112
77a23c21 113 if (max_cmdsn != session->max_cmdsn &&
46a84c65 114 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
77a23c21 115 session->max_cmdsn = max_cmdsn;
7996a778 116}
4c0ba5d2
MC		 117
118void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
119{
120 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
121 be32_to_cpu(hdr->max_cmdsn));
122}
77a23c21 123EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 124
577577da
MC		 125/**
126 * iscsi_prep_data_out_pdu - initialize Data-Out
127 * @task: scsi command task
128 * @r2t: R2T info
129 * @hdr: iscsi data in pdu
130 *
131 * Notes:
132 * Initialize Data-Out within this R2T sequence and finds
133 * proper data_offset within this SCSI command.
134 *
135 * This function is called with connection lock taken.
136 **/
137void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
138 struct iscsi_data *hdr)
7996a778 139{
9c19a7d0 140 struct iscsi_conn *conn = task->conn;
577577da
MC		 141 unsigned int left = r2t->data_length - r2t->sent;
142
143 task->hdr_len = sizeof(struct iscsi_data);
7996a778
MC		 144
145 memset(hdr, 0, sizeof(struct iscsi_data));
577577da
MC		 146 hdr->ttt = r2t->ttt;
147 hdr->datasn = cpu_to_be32(r2t->datasn);
148 r2t->datasn++;
7996a778 149 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
55bdabdf 150 hdr->lun = task->lun;
577577da
MC		 151 hdr->itt = task->hdr_itt;
152 hdr->exp_statsn = r2t->exp_statsn;
153 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
154 if (left > conn->max_xmit_dlength) {
7996a778 155 hton24(hdr->dlength, conn->max_xmit_dlength);
577577da 156 r2t->data_count = conn->max_xmit_dlength;
7996a778
MC		 157 hdr->flags = 0;
158 } else {
577577da
MC		 159 hton24(hdr->dlength, left);
160 r2t->data_count = left;
7996a778
MC		 161 hdr->flags = ISCSI_FLAG_CMD_FINAL;
162 }
577577da 163 conn->dataout_pdus_cnt++;
7996a778 164}
577577da 165EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
7996a778 166
9c19a7d0 167static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 168{
9c19a7d0 169 unsigned exp_len = task->hdr_len + len;
004d6530 170
9c19a7d0 171 if (exp_len > task->hdr_max) {
004d6530
BH		 172 WARN_ON(1);
173 return -EINVAL;
174 }
175
176 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 177 task->hdr_len = exp_len;
004d6530
BH		 178 return 0;
179}
180
38d1c069
BH		 181/*
182 * make an extended cdb AHS
183 */
9c19a7d0 184static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 185{
9c19a7d0 186 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 187 unsigned rlen, pad_len;
188 unsigned short ahslength;
189 struct iscsi_ecdb_ahdr *ecdb_ahdr;
190 int rc;
191
9c19a7d0 192 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 193 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
194
195 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
196 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
197
198 pad_len = iscsi_padding(rlen);
199
9c19a7d0 200 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 201 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
202 if (rc)
203 return rc;
204
205 if (pad_len)
206 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
207
208 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
209 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
210 ecdb_ahdr->reserved = 0;
211 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
212
1b2c7af8
MC		 213 ISCSI_DBG_SESSION(task->conn->session,
214 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
215 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
216 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
217 task->hdr_len);
38d1c069
BH		 218 return 0;
219}
220
9c19a7d0 221static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
c07d4444 222{
9c19a7d0 223 struct scsi_cmnd *sc = task->sc;
c07d4444
BH		 224 struct iscsi_rlength_ahdr *rlen_ahdr;
225 int rc;
226
9c19a7d0
MC		 227 rlen_ahdr = iscsi_next_hdr(task);
228 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
c07d4444
BH		 229 if (rc)
230 return rc;
231
232 rlen_ahdr->ahslength =
233 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
234 sizeof(rlen_ahdr->reserved));
235 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
236 rlen_ahdr->reserved = 0;
237 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
238
1b2c7af8
MC		 239 ISCSI_DBG_SESSION(task->conn->session,
240 "bidi-in rlen_ahdr->read_length(%d) "
241 "rlen_ahdr->ahslength(%d)\n",
242 be32_to_cpu(rlen_ahdr->read_length),
243 be16_to_cpu(rlen_ahdr->ahslength));
c07d4444
BH		 244 return 0;
245}
246
5d12c05e
MC		 247/**
248 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
249 * @task: iscsi task
250 * @opcode: opcode to check for
251 *
252 * During TMF a task has to be checked if it's affected.
253 * All unrelated I/O can be passed through, but I/O to the
254 * affected LUN should be restricted.
255 * If 'fast_abort' is set we won't be sending any I/O to the
256 * affected LUN.
257 * Otherwise the target is waiting for all TTTs to be completed,
258 * so we have to send all outstanding Data-Out PDUs to the target.
259 */
260static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
261{
262 struct iscsi_conn *conn = task->conn;
263 struct iscsi_tm *tmf = &conn->tmhdr;
9cb78c16 264 u64 hdr_lun;
5d12c05e
MC		 265
266 if (conn->tmf_state == TMF_INITIAL)
267 return 0;
268
269 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
270 return 0;
271
272 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
273 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
274 /*
275 * Allow PDUs for unrelated LUNs
276 */
55bdabdf 277 hdr_lun = scsilun_to_int(&tmf->lun);
5d12c05e
MC		 278 if (hdr_lun != task->sc->device->lun)
279 return 0;
3fe5ae8b
MC		 280 /* fall through */
281 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
5d12c05e
MC		 282 /*
283 * Fail all SCSI cmd PDUs
284 */
285 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
286 iscsi_conn_printk(KERN_INFO, conn,
287 "task [op %x/%x itt "
3fe5ae8b 288 "0x%x/0x%x] "
5d12c05e
MC		 289 "rejected.\n",
290 task->hdr->opcode, opcode,
3fe5ae8b 291 task->itt, task->hdr_itt);
5d12c05e
MC		 292 return -EACCES;
293 }
294 /*
295 * And also all data-out PDUs in response to R2T
296 * if fast_abort is set.
297 */
298 if (conn->session->fast_abort) {
299 iscsi_conn_printk(KERN_INFO, conn,
300 "task [op %x/%x itt "
3fe5ae8b 301 "0x%x/0x%x] fast abort.\n",
5d12c05e 302 task->hdr->opcode, opcode,
3fe5ae8b 303 task->itt, task->hdr_itt);
5d12c05e
MC		 304 return -EACCES;
305 }
306 break;
307 case ISCSI_TM_FUNC_ABORT_TASK:
308 /*
309 * the caller has already checked if the task
310 * they want to abort was in the pending queue so if
311 * we are here the cmd pdu has gone out already, and
312 * we will only hit this for data-outs
313 */
314 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
315 task->hdr_itt == tmf->rtt) {
316 ISCSI_DBG_SESSION(conn->session,
317 "Preventing task %x/%x from sending "
318 "data-out due to abort task in "
319 "progress\n", task->itt,
320 task->hdr_itt);
321 return -EACCES;
322 }
323 break;
324 }
325
326 return 0;
327}
328
7996a778
MC		 329/**
330 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 331 * @task: iscsi task
7996a778
MC		 332 *
333 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
334 * fields like dlength or final based on how much data it sends
335 */
9c19a7d0 336static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 337{
9c19a7d0 338 struct iscsi_conn *conn = task->conn;
7996a778 339 struct iscsi_session *session = conn->session;
9c19a7d0 340 struct scsi_cmnd *sc = task->sc;
12352183 341 struct iscsi_scsi_req *hdr;
d77e6535 342 unsigned hdrlength, cmd_len, transfer_length;
262ef636 343 itt_t itt;
004d6530 344 int rc;
7996a778 345
5d12c05e
MC		 346 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
347 if (rc)
348 return rc;
349
184b57c6
MC		 350 if (conn->session->tt->alloc_pdu) {
351 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
352 if (rc)
353 return rc;
354 }
12352183 355 hdr = (struct iscsi_scsi_req *)task->hdr;
262ef636 356 itt = hdr->itt;
577577da
MC		 357 memset(hdr, 0, sizeof(*hdr));
358
2ff79d52
MC		 359 if (session->tt->parse_pdu_itt)
360 hdr->itt = task->hdr_itt = itt;
361 else
362 hdr->itt = task->hdr_itt = build_itt(task->itt,
363 task->conn->session->age);
9c19a7d0
MC		 364 task->hdr_len = 0;
365 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 366 if (rc)
367 return rc;
a8ac6311
OK		 368 hdr->opcode = ISCSI_OP_SCSI_CMD;
369 hdr->flags = ISCSI_ATTR_SIMPLE;
55bdabdf
AG		 370 int_to_scsilun(sc->device->lun, &hdr->lun);
371 task->lun = hdr->lun;
a8ac6311 372 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 373 cmd_len = sc->cmd_len;
374 if (cmd_len < ISCSI_CDB_SIZE)
375 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
376 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 377 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 378 if (rc)
379 return rc;
380 cmd_len = ISCSI_CDB_SIZE;
381 }
382 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 383
9c19a7d0 384 task->imm_count = 0;
c07d4444
BH		 385 if (scsi_bidi_cmnd(sc)) {
386 hdr->flags |= ISCSI_FLAG_CMD_READ;
9c19a7d0 387 rc = iscsi_prep_bidi_ahs(task);
c07d4444
BH		 388 if (rc)
389 return rc;
390 }
55e51eda
SG		 391
392 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
393 task->protected = true;
394
d77e6535
SG		 395 transfer_length = scsi_transfer_length(sc);
396 hdr->data_length = cpu_to_be32(transfer_length);
7996a778 397 if (sc->sc_data_direction == DMA_TO_DEVICE) {
577577da
MC		 398 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
399
7996a778
MC		 400 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
401 /*
402 * Write counters:
403 *
404 * imm_count bytes to be sent right after
405 * SCSI PDU Header
406 *
407 * unsol_count bytes(as Data-Out) to be sent
408 * without R2T ack right after
409 * immediate data
410 *
577577da 411 * r2t data_length bytes to be sent via R2T ack's
7996a778
MC		 412 *
413 * pad_count bytes to be sent as zero-padding
414 */
577577da 415 memset(r2t, 0, sizeof(*r2t));
7996a778
MC		 416
417 if (session->imm_data_en) {
d77e6535 418 if (transfer_length >= session->first_burst)
9c19a7d0 419 task->imm_count = min(session->first_burst,
7996a778
MC		 420 conn->max_xmit_dlength);
421 else
d77e6535
SG		 422 task->imm_count = min(transfer_length,
423 conn->max_xmit_dlength);
9c19a7d0 424 hton24(hdr->dlength, task->imm_count);
7996a778 425 } else
a8ac6311 426 zero_data(hdr->dlength);
7996a778 427
ffd0436e 428 if (!session->initial_r2t_en) {
d77e6535
SG		 429 r2t->data_length = min(session->first_burst,
430 transfer_length) -
577577da
MC		 431 task->imm_count;
432 r2t->data_offset = task->imm_count;
433 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
434 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e
MC		 435 }
436
577577da 437 if (!task->unsol_r2t.data_length)
7996a778 438 /* No unsolicit Data-Out's */
a8ac6311 439 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 440 } else {
7996a778
MC		 441 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
442 zero_data(hdr->dlength);
443
444 if (sc->sc_data_direction == DMA_FROM_DEVICE)
445 hdr->flags |= ISCSI_FLAG_CMD_READ;
446 }
447
004d6530 448 /* calculate size of additional header segments (AHSs) */
9c19a7d0 449 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 450
451 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
452 hdrlength /= ISCSI_PAD_LEN;
453
454 WARN_ON(hdrlength >= 256);
455 hdr->hlength = hdrlength & 0xFF;
96b1f96d 456 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
004d6530 457
577577da 458 if (session->tt->init_task && session->tt->init_task(task))
052d0144
MC		 459 return -EIO;
460
9c19a7d0 461 task->state = ISCSI_TASK_RUNNING;
d3305f34 462 session->cmdsn++;
77a23c21 463
a8ac6311 464 conn->scsicmd_pdus_cnt++;
1b2c7af8
MC		 465 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
466 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
467 scsi_bidi_cmnd(sc) ? "bidirectional" :
468 sc->sc_data_direction == DMA_TO_DEVICE ?
469 "write" : "read", conn->id, sc, sc->cmnd[0],
d77e6535 470 task->itt, transfer_length,
1b2c7af8
MC		 471 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
472 session->cmdsn,
473 session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 474 return 0;
7996a778 475}
7996a778
MC		 476
477/**
3bbaaad9 478 * iscsi_free_task - free a task
9c19a7d0 479 * @task: iscsi cmd task
7996a778 480 *
659743b0 481 * Must be called with session back_lock.
3e5c28ad
MC		 482 * This function returns the scsi command to scsi-ml or cleans
483 * up mgmt tasks then returns the task to the pool.
7996a778 484 */
3bbaaad9 485static void iscsi_free_task(struct iscsi_task *task)
7996a778 486{
9c19a7d0 487 struct iscsi_conn *conn = task->conn;
c1635cb7 488 struct iscsi_session *session = conn->session;
9c19a7d0 489 struct scsi_cmnd *sc = task->sc;
f41d4721 490 int oldstate = task->state;
7996a778 491
4421c9eb
MC		 492 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
493 task->itt, task->state, task->sc);
494
577577da 495 session->tt->cleanup_task(task);
3bbaaad9 496 task->state = ISCSI_TASK_FREE;
9c19a7d0 497 task->sc = NULL;
3e5c28ad 498 /*
9c19a7d0 499 * login task is preallocated so do not free
3e5c28ad 500 */
9c19a7d0 501 if (conn->login_task == task)
3e5c28ad
MC		 502 return;
503
7acd72eb 504 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 505
3e5c28ad 506 if (sc) {
3e5c28ad
MC		 507 /* SCSI eh reuses commands to verify us */
508 sc->SCp.ptr = NULL;
509 /*
f41d4721
MC		 510 * queue command may call this to free the task, so
511 * it will decide how to return sc to scsi-ml.
3e5c28ad 512 */
f41d4721 513 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
3e5c28ad
MC		 514 sc->scsi_done(sc);
515 }
7996a778
MC		 516}
517
913e5bf4 518void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 519{
6dc618cd 520 refcount_inc(&task->refcount);
60ecebf5 521}
913e5bf4 522EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 523
8eea2f55 524void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 525{
6dc618cd 526 if (refcount_dec_and_test(&task->refcount))
3bbaaad9 527 iscsi_free_task(task);
60ecebf5 528}
8eea2f55 529EXPORT_SYMBOL_GPL(__iscsi_put_task);
60ecebf5 530
9c19a7d0 531void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 532{
9c19a7d0 533 struct iscsi_session *session = task->conn->session;
3e5c28ad 534
659743b0
SP		 535 /* regular RX path uses back_lock */
536 spin_lock_bh(&session->back_lock);
9c19a7d0 537 __iscsi_put_task(task);
659743b0 538 spin_unlock_bh(&session->back_lock);
3e5c28ad 539}
9c19a7d0 540EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 541
3bbaaad9
MC		 542/**
543 * iscsi_complete_task - finish a task
544 * @task: iscsi cmd task
b3cd5050 545 * @state: state to complete task with
3bbaaad9 546 *
659743b0 547 * Must be called with session back_lock.
3bbaaad9 548 */
b3cd5050 549static void iscsi_complete_task(struct iscsi_task *task, int state)
3bbaaad9
MC		 550{
551 struct iscsi_conn *conn = task->conn;
552
4421c9eb
MC		 553 ISCSI_DBG_SESSION(conn->session,
554 "complete task itt 0x%x state %d sc %p\n",
555 task->itt, task->state, task->sc);
b3cd5050
MC		 556 if (task->state == ISCSI_TASK_COMPLETED ||
557 task->state == ISCSI_TASK_ABRT_TMF ||
f41d4721
MC		 558 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
559 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
3bbaaad9
MC		 560 return;
561 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
b3cd5050 562 task->state = state;
3bbaaad9 563
6f8830f5
CL		 564 spin_lock_bh(&conn->taskqueuelock);
565 if (!list_empty(&task->running)) {
566 pr_debug_once("%s while task on list", __func__);
3bbaaad9 567 list_del_init(&task->running);
6f8830f5
CL		 568 }
569 spin_unlock_bh(&conn->taskqueuelock);
3bbaaad9
MC		 570
571 if (conn->task == task)
572 conn->task = NULL;
573
574 if (conn->ping_task == task)
575 conn->ping_task = NULL;
576
577 /* release get from queueing */
578 __iscsi_put_task(task);
579}
580
4c0ba5d2
MC		 581/**
582 * iscsi_complete_scsi_task - finish scsi task normally
583 * @task: iscsi task for scsi cmd
584 * @exp_cmdsn: expected cmd sn in cpu format
585 * @max_cmdsn: max cmd sn in cpu format
586 *
587 * This is used when drivers do not need or cannot perform
588 * lower level pdu processing.
589 *
659743b0 590 * Called with session back_lock
4c0ba5d2
MC		 591 */
592void iscsi_complete_scsi_task(struct iscsi_task *task,
593 uint32_t exp_cmdsn, uint32_t max_cmdsn)
594{
595 struct iscsi_conn *conn = task->conn;
596
597 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
598
599 conn->last_recv = jiffies;
600 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
601 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
602}
603EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
604
605
b3a7ea8d 606/*
659743b0 607 * session back_lock must be held and if not called for a task that is
3bbaaad9
MC		 608 * still pending or from the xmit thread, then xmit thread must
609 * be suspended.
b3a7ea8d 610 */
3bbaaad9 611static void fail_scsi_task(struct iscsi_task *task, int err)
b3a7ea8d 612{
3bbaaad9 613 struct iscsi_conn *conn = task->conn;
b3a7ea8d 614 struct scsi_cmnd *sc;
b3cd5050 615 int state;
b3a7ea8d 616
3bbaaad9
MC		 617 /*
618 * if a command completes and we get a successful tmf response
619 * we will hit this because the scsi eh abort code does not take
620 * a ref to the task.
621 */
9c19a7d0 622 sc = task->sc;
b3a7ea8d
MC		 623 if (!sc)
624 return;
625
b3cd5050 626 if (task->state == ISCSI_TASK_PENDING) {
b3a7ea8d
MC		 627 /*
628 * cmd never made it to the xmit thread, so we should not count
629 * the cmd in the sequencing
630 */
631 conn->session->queued_cmdsn--;
b3cd5050
MC		 632 /* it was never sent so just complete like normal */
633 state = ISCSI_TASK_COMPLETED;
634 } else if (err == DID_TRANSPORT_DISRUPTED)
635 state = ISCSI_TASK_ABRT_SESS_RECOV;
636 else
637 state = ISCSI_TASK_ABRT_TMF;
b3a7ea8d 638
b3cd5050 639 sc->result = err << 16;
c07d4444
BH		 640 if (!scsi_bidi_cmnd(sc))
641 scsi_set_resid(sc, scsi_bufflen(sc));
642 else {
643 scsi_out(sc)->resid = scsi_out(sc)->length;
644 scsi_in(sc)->resid = scsi_in(sc)->length;
645 }
3e5c28ad 646
659743b0
SP		 647 /* regular RX path uses back_lock */
648 spin_lock_bh(&conn->session->back_lock);
b3cd5050 649 iscsi_complete_task(task, state);
659743b0 650 spin_unlock_bh(&conn->session->back_lock);
b3a7ea8d
MC		 651}
652
3e5c28ad 653static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 654 struct iscsi_task *task)
052d0144
MC		 655{
656 struct iscsi_session *session = conn->session;
577577da 657 struct iscsi_hdr *hdr = task->hdr;
052d0144 658 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
4f704dc0 659 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
052d0144
MC		 660
661 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
662 return -ENOTCONN;
663
4f704dc0 664 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
052d0144
MC		 665 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
666 /*
667 * pre-format CmdSN for outgoing PDU.
668 */
669 nop->cmdsn = cpu_to_be32(session->cmdsn);
670 if (hdr->itt != RESERVED_ITT) {
052d0144 671 /*
4f704dc0 672 * TODO: We always use immediate for normal session pdus.
052d0144
MC		 673 * If we start to send tmfs or nops as non-immediate then
674 * we should start checking the cmdsn numbers for mgmt tasks.
4f704dc0
MC		 675 *
676 * During discovery sessions iscsid sends TEXT as non immediate,
677 * but we always only send one PDU at a time.
052d0144
MC		 678 */
679 if (conn->c_stage == ISCSI_CONN_STARTED &&
680 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
681 session->queued_cmdsn++;
682 session->cmdsn++;
683 }
684 }
685
ae15f801
MC		 686 if (session->tt->init_task && session->tt->init_task(task))
687 return -EIO;
052d0144
MC		 688
689 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
690 session->state = ISCSI_STATE_LOGGING_OUT;
691
577577da 692 task->state = ISCSI_TASK_RUNNING;
1b2c7af8
MC		 693 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
694 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
695 hdr->itt, task->data_count);
052d0144
MC		 696 return 0;
697}
698
9c19a7d0 699static struct iscsi_task *
f6d5180c
MC		 700__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
701 char *data, uint32_t data_size)
702{
703 struct iscsi_session *session = conn->session;
1336aed1 704 struct iscsi_host *ihost = shost_priv(session->host);
4f704dc0 705 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
9c19a7d0 706 struct iscsi_task *task;
262ef636 707 itt_t itt;
f6d5180c
MC		 708
709 if (session->state == ISCSI_STATE_TERMINATE)
710 return NULL;
711
4f704dc0 712 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
f6d5180c
MC		 713 /*
714 * Login and Text are sent serially, in
715 * request-followed-by-response sequence.
3e5c28ad
MC		 716 * Same task can be used. Same ITT must be used.
717 * Note that login_task is preallocated at conn_create().
f6d5180c 718 */
4f704dc0
MC		 719 if (conn->login_task->state != ISCSI_TASK_FREE) {
720 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
721 "progress. Cannot start new task.\n");
722 return NULL;
723 }
724
cbaa4221
MC		 725 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
726 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
727 return NULL;
728 }
729
9c19a7d0 730 task = conn->login_task;
4f704dc0 731 } else {
26013ad4
MC		 732 if (session->state != ISCSI_STATE_LOGGED_IN)
733 return NULL;
734
cbaa4221
MC		 735 if (data_size != 0) {
736 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
737 return NULL;
738 }
739
f6d5180c
MC		 740 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
741 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
742
7acd72eb 743 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 744 (void*)&task, sizeof(void*)))
f6d5180c
MC		 745 return NULL;
746 }
3e5c28ad
MC		 747 /*
748 * released in complete pdu for task we expect a response for, and
749 * released by the lld when it has transmitted the task for
750 * pdus we do not expect a response for.
751 */
6dc618cd 752 refcount_set(&task->refcount, 1);
9c19a7d0
MC		 753 task->conn = conn;
754 task->sc = NULL;
3bbaaad9
MC		 755 INIT_LIST_HEAD(&task->running);
756 task->state = ISCSI_TASK_PENDING;
f6d5180c
MC		 757
758 if (data_size) {
9c19a7d0
MC		 759 memcpy(task->data, data, data_size);
760 task->data_count = data_size;
f6d5180c 761 } else
9c19a7d0 762 task->data_count = 0;
f6d5180c 763
184b57c6
MC		 764 if (conn->session->tt->alloc_pdu) {
765 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
766 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
767 "pdu for mgmt task.\n");
3bbaaad9 768 goto free_task;
184b57c6 769 }
577577da 770 }
184b57c6 771
262ef636 772 itt = task->hdr->itt;
577577da 773 task->hdr_len = sizeof(struct iscsi_hdr);
9c19a7d0 774 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
262ef636
MC		 775
776 if (hdr->itt != RESERVED_ITT) {
777 if (session->tt->parse_pdu_itt)
778 task->hdr->itt = itt;
779 else
780 task->hdr->itt = build_itt(task->itt,
781 task->conn->session->age);
782 }
783
1336aed1 784 if (!ihost->workq) {
577577da
MC		 785 if (iscsi_prep_mgmt_task(conn, task))
786 goto free_task;
052d0144 787
9c19a7d0 788 if (session->tt->xmit_task(task))
577577da 789 goto free_task;
3bbaaad9 790 } else {
6f8830f5 791 spin_lock_bh(&conn->taskqueuelock);
3bbaaad9 792 list_add_tail(&task->running, &conn->mgmtqueue);
6f8830f5 793 spin_unlock_bh(&conn->taskqueuelock);
32ae763e 794 iscsi_conn_queue_work(conn);
3bbaaad9 795 }
052d0144 796
9c19a7d0 797 return task;
577577da
MC		 798
799free_task:
659743b0 800 /* regular RX path uses back_lock */
4fa50799 801 spin_lock(&session->back_lock);
577577da 802 __iscsi_put_task(task);
4fa50799 803 spin_unlock(&session->back_lock);
577577da 804 return NULL;
f6d5180c
MC		 805}
806
807int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
808 char *data, uint32_t data_size)
809{
810 struct iscsi_conn *conn = cls_conn->dd_data;
811 struct iscsi_session *session = conn->session;
812 int err = 0;
813
659743b0 814 spin_lock_bh(&session->frwd_lock);
f6d5180c
MC		 815 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
816 err = -EPERM;
659743b0 817 spin_unlock_bh(&session->frwd_lock);
f6d5180c
MC		 818 return err;
819}
820EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
821
7996a778
MC		 822/**
823 * iscsi_cmd_rsp - SCSI Command Response processing
824 * @conn: iscsi connection
825 * @hdr: iscsi header
9c19a7d0 826 * @task: scsi command task
7996a778
MC		 827 * @data: cmd data buffer
828 * @datalen: len of buffer
829 *
830 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
9c19a7d0 831 * then completes the command and task.
7996a778 832 **/
77a23c21 833static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 834 struct iscsi_task *task, char *data,
77a23c21 835 int datalen)
7996a778 836{
12352183 837 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
7996a778 838 struct iscsi_session *session = conn->session;
9c19a7d0 839 struct scsi_cmnd *sc = task->sc;
7996a778 840
77a23c21 841 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 842 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
843
844 sc->result = (DID_OK << 16) | rhdr->cmd_status;
845
55e51eda
SG		 846 if (task->protected) {
847 sector_t sector;
848 u8 ascq;
849
850 /**
851 * Transports that didn't implement check_protection
852 * callback but still published T10-PI support to scsi-mid
853 * deserve this BUG_ON.
854 **/
855 BUG_ON(!session->tt->check_protection);
856
857 ascq = session->tt->check_protection(task, &sector);
858 if (ascq) {
859 sc->result = DRIVER_SENSE << 24 |
860 SAM_STAT_CHECK_CONDITION;
861 scsi_build_sense_buffer(1, sc->sense_buffer,
862 ILLEGAL_REQUEST, 0x10, ascq);
a73c2a2f
SG		 863 scsi_set_sense_information(sc->sense_buffer,
864 SCSI_SENSE_BUFFERSIZE,
865 sector);
55e51eda
SG		 866 goto out;
867 }
868 }
869
7996a778
MC		 870 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
871 sc->result = DID_ERROR << 16;
872 goto out;
873 }
874
875 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 876 uint16_t senselen;
7996a778
MC		 877
878 if (datalen < 2) {
879invalid_datalen:
322d739d
MC		 880 iscsi_conn_printk(KERN_ERR, conn,
881 "Got CHECK_CONDITION but invalid data "
882 "buffer size of %d\n", datalen);
7996a778
MC		 883 sc->result = DID_BAD_TARGET << 16;
884 goto out;
885 }
886
8f333991 887 senselen = get_unaligned_be16(data);
7996a778
MC		 888 if (datalen < senselen)
889 goto invalid_datalen;
890
891 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 892 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
1b2c7af8
MC		 893 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
894 min_t(uint16_t, senselen,
895 SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 896 }
897
c07d4444
BH		 898 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
899 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
900 int res_count = be32_to_cpu(rhdr->bi_residual_count);
901
902 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
903 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
904 res_count <= scsi_in(sc)->length))
905 scsi_in(sc)->resid = res_count;
906 else
907 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
908 }
909
7207fea4
BH		 910 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
911 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 912 int res_count = be32_to_cpu(rhdr->residual_count);
913
7207fea4
BH		 914 if (res_count > 0 &&
915 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
916 res_count <= scsi_bufflen(sc)))
c07d4444 917 /* write side for bidi or uni-io set_resid */
1c138991 918 scsi_set_resid(sc, res_count);
7996a778
MC		 919 else
920 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 921 }
7996a778 922out:
3bbaaad9 923 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
1b2c7af8 924 sc, sc->result, task->itt);
7996a778 925 conn->scsirsp_pdus_cnt++;
b3cd5050 926 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 927}
928
1d9edf02
MC		 929/**
930 * iscsi_data_in_rsp - SCSI Data-In Response processing
931 * @conn: iscsi connection
932 * @hdr: iscsi pdu
933 * @task: scsi command task
934 **/
935static void
936iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
937 struct iscsi_task *task)
938{
939 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
940 struct scsi_cmnd *sc = task->sc;
941
942 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
943 return;
944
edbc9aa0 945 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
1d9edf02
MC		 946 sc->result = (DID_OK << 16) | rhdr->cmd_status;
947 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
948 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
949 ISCSI_FLAG_DATA_OVERFLOW)) {
950 int res_count = be32_to_cpu(rhdr->residual_count);
951
952 if (res_count > 0 &&
953 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
954 res_count <= scsi_in(sc)->length))
955 scsi_in(sc)->resid = res_count;
956 else
957 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
958 }
959
3bbaaad9
MC		 960 ISCSI_DBG_SESSION(conn->session, "data in with status done "
961 "[sc %p res %d itt 0x%x]\n",
962 sc, sc->result, task->itt);
1d9edf02 963 conn->scsirsp_pdus_cnt++;
b3cd5050 964 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1d9edf02
MC		 965}
966
7ea8b828
MC		 967static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
968{
969 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
970
971 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
972 conn->tmfrsp_pdus_cnt++;
973
843c0a8a 974 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 975 return;
976
977 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 978 conn->tmf_state = TMF_SUCCESS;
7ea8b828 979 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 980 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 981 else
843c0a8a 982 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 983 wake_up(&conn->ehwait);
984}
985
52f5664a 986static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
f6d5180c
MC		 987{
988 struct iscsi_nopout hdr;
9c19a7d0 989 struct iscsi_task *task;
f6d5180c 990
9c19a7d0 991 if (!rhdr && conn->ping_task)
52f5664a 992 return -EINVAL;
f6d5180c
MC		 993
994 memset(&hdr, 0, sizeof(struct iscsi_nopout));
995 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
996 hdr.flags = ISCSI_FLAG_CMD_FINAL;
997
998 if (rhdr) {
55bdabdf 999 hdr.lun = rhdr->lun;
f6d5180c
MC		 1000 hdr.ttt = rhdr->ttt;
1001 hdr.itt = RESERVED_ITT;
1002 } else
1003 hdr.ttt = RESERVED_ITT;
1004
9c19a7d0 1005 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
52f5664a 1006 if (!task) {
322d739d 1007 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
52f5664a
AN		 1008 return -EIO;
1009 } else if (!rhdr) {
d3acf022
MC		 1010 /* only track our nops */
1011 conn->ping_task = task;
1012 conn->last_ping = jiffies;
1013 }
52f5664a
AN		 1014
1015 return 0;
f6d5180c
MC		 1016}
1017
8afa1439
MC		 1018static int iscsi_nop_out_rsp(struct iscsi_task *task,
1019 struct iscsi_nopin *nop, char *data, int datalen)
1020{
1021 struct iscsi_conn *conn = task->conn;
1022 int rc = 0;
1023
1024 if (conn->ping_task != task) {
1025 /*
1026 * If this is not in response to one of our
1027 * nops then it must be from userspace.
1028 */
1029 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1030 data, datalen))
1031 rc = ISCSI_ERR_CONN_FAILED;
1032 } else
1033 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1034 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1035 return rc;
1036}
1037
62f38300
MC		 1038static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1039 char *data, int datalen)
1040{
1041 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1042 struct iscsi_hdr rejected_pdu;
8afa1439 1043 int opcode, rc = 0;
62f38300
MC		 1044
1045 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1046
8afa1439
MC		 1047 if (ntoh24(reject->dlength) > datalen ||
1048 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1049 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1050 "pdu. Invalid data length (pdu dlength "
1051 "%u, datalen %d\n", ntoh24(reject->dlength),
1052 datalen);
1053 return ISCSI_ERR_PROTO;
1054 }
1055 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1056 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1057
1058 switch (reject->reason) {
1059 case ISCSI_REASON_DATA_DIGEST_ERROR:
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "pdu (op 0x%x itt 0x%x) rejected "
1062 "due to DataDigest error.\n",
e5dbbe27 1063 opcode, rejected_pdu.itt);
8afa1439
MC		 1064 break;
1065 case ISCSI_REASON_IMM_CMD_REJECT:
1066 iscsi_conn_printk(KERN_ERR, conn,
1067 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1068 "immediate commands.\n",
e5dbbe27 1069 opcode, rejected_pdu.itt);
8afa1439
MC		 1070 /*
1071 * We only send one TMF at a time so if the target could not
1072 * handle it, then it should get fixed (RFC mandates that
1073 * a target can handle one immediate TMF per conn).
1074 *
1075 * For nops-outs, we could have sent more than one if
1076 * the target is sending us lots of nop-ins
1077 */
1078 if (opcode != ISCSI_OP_NOOP_OUT)
1079 return 0;
62f38300 1080
4dec6a8f 1081 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
8afa1439
MC		 1082 /*
1083 * nop-out in response to target's nop-out rejected.
1084 * Just resend.
1085 */
659743b0
SP		 1086 /* In RX path we are under back lock */
1087 spin_unlock(&conn->session->back_lock);
1088 spin_lock(&conn->session->frwd_lock);
8afa1439
MC		 1089 iscsi_send_nopout(conn,
1090 (struct iscsi_nopin*)&rejected_pdu);
659743b0
SP		 1091 spin_unlock(&conn->session->frwd_lock);
1092 spin_lock(&conn->session->back_lock);
1093 } else {
8afa1439
MC		 1094 struct iscsi_task *task;
1095 /*
1096 * Our nop as ping got dropped. We know the target
1097 * and transport are ok so just clean up
1098 */
1099 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1100 if (!task) {
1101 iscsi_conn_printk(KERN_ERR, conn,
1102 "Invalid pdu reject. Could "
1103 "not lookup rejected task.\n");
1104 rc = ISCSI_ERR_BAD_ITT;
1105 } else
1106 rc = iscsi_nop_out_rsp(task,
1107 (struct iscsi_nopin*)&rejected_pdu,
1108 NULL, 0);
62f38300 1109 }
8afa1439
MC		 1110 break;
1111 default:
1112 iscsi_conn_printk(KERN_ERR, conn,
1113 "pdu (op 0x%x itt 0x%x) rejected. Reason "
e5dbbe27
VC		 1114 "code 0x%x\n", rejected_pdu.opcode,
1115 rejected_pdu.itt, reject->reason);
8afa1439 1116 break;
62f38300 1117 }
8afa1439 1118 return rc;
62f38300
MC		 1119}
1120
913e5bf4
MC		 1121/**
1122 * iscsi_itt_to_task - look up task by itt
1123 * @conn: iscsi connection
1124 * @itt: itt
1125 *
1126 * This should be used for mgmt tasks like login and nops, or if
1127 * the LDD's itt space does not include the session age.
1128 *
659743b0 1129 * The session back_lock must be held.
913e5bf4 1130 */
8f9256ce 1131struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
913e5bf4
MC		 1132{
1133 struct iscsi_session *session = conn->session;
262ef636 1134 int i;
913e5bf4
MC		 1135
1136 if (itt == RESERVED_ITT)
1137 return NULL;
1138
262ef636
MC		 1139 if (session->tt->parse_pdu_itt)
1140 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1141 else
1142 i = get_itt(itt);
913e5bf4
MC		 1143 if (i >= session->cmds_max)
1144 return NULL;
1145
1146 return session->cmds[i];
1147}
8f9256ce 1148EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
913e5bf4 1149
7996a778
MC		 1150/**
1151 * __iscsi_complete_pdu - complete pdu
1152 * @conn: iscsi conn
1153 * @hdr: iscsi header
1154 * @data: data buffer
1155 * @datalen: len of data buffer
1156 *
1157 * Completes pdu processing by freeing any resources allocated at
659743b0 1158 * queuecommand or send generic. session back_lock must be held and verify
7996a778
MC		 1159 * itt must have been called.
1160 */
913e5bf4
MC		 1161int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1162 char *data, int datalen)
7996a778
MC		 1163{
1164 struct iscsi_session *session = conn->session;
1165 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 1166 struct iscsi_task *task;
7996a778
MC		 1167 uint32_t itt;
1168
f6d5180c 1169 conn->last_recv = jiffies;
0af967f5
MC		 1170 rc = iscsi_verify_itt(conn, hdr->itt);
1171 if (rc)
1172 return rc;
1173
b4377356
AV		 1174 if (hdr->itt != RESERVED_ITT)
1175 itt = get_itt(hdr->itt);
7996a778 1176 else
b4377356 1177 itt = ~0U;
7996a778 1178
1b2c7af8
MC		 1179 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1180 opcode, conn->id, itt, datalen);
7996a778 1181
3e5c28ad 1182 if (itt == ~0U) {
77a23c21 1183 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 1184
7996a778
MC		 1185 switch(opcode) {
1186 case ISCSI_OP_NOOP_IN:
40527afe 1187 if (datalen) {
7996a778 1188 rc = ISCSI_ERR_PROTO;
40527afe
MC		 1189 break;
1190 }
1191
b4377356 1192 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 1193 break;
1194
659743b0
SP		 1195 /* In RX path we are under back lock */
1196 spin_unlock(&session->back_lock);
1197 spin_lock(&session->frwd_lock);
f6d5180c 1198 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
659743b0
SP		 1199 spin_unlock(&session->frwd_lock);
1200 spin_lock(&session->back_lock);
7996a778
MC		 1201 break;
1202 case ISCSI_OP_REJECT:
62f38300
MC		 1203 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1204 break;
7996a778 1205 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 1206 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 1207 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1208 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 1209 break;
1210 default:
1211 rc = ISCSI_ERR_BAD_OPCODE;
1212 break;
1213 }
3e5c28ad
MC		 1214 goto out;
1215 }
1216
3e5c28ad
MC		 1217 switch(opcode) {
1218 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 1219 case ISCSI_OP_SCSI_DATA_IN:
1220 task = iscsi_itt_to_ctask(conn, hdr->itt);
1221 if (!task)
1222 return ISCSI_ERR_BAD_ITT;
d355e57d 1223 task->last_xfer = jiffies;
913e5bf4
MC		 1224 break;
1225 case ISCSI_OP_R2T:
1226 /*
1227 * LLD handles R2Ts if they need to.
1228 */
1229 return 0;
1230 case ISCSI_OP_LOGOUT_RSP:
1231 case ISCSI_OP_LOGIN_RSP:
1232 case ISCSI_OP_TEXT_RSP:
1233 case ISCSI_OP_SCSI_TMFUNC_RSP:
1234 case ISCSI_OP_NOOP_IN:
1235 task = iscsi_itt_to_task(conn, hdr->itt);
1236 if (!task)
1237 return ISCSI_ERR_BAD_ITT;
1238 break;
1239 default:
1240 return ISCSI_ERR_BAD_OPCODE;
1241 }
1242
1243 switch(opcode) {
1244 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 1245 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 1246 break;
1247 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 1248 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 1249 break;
3e5c28ad
MC		 1250 case ISCSI_OP_LOGOUT_RSP:
1251 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1252 if (datalen) {
1253 rc = ISCSI_ERR_PROTO;
1254 break;
1255 }
1256 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1257 goto recv_pdu;
1258 case ISCSI_OP_LOGIN_RSP:
1259 case ISCSI_OP_TEXT_RSP:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 /*
1262 * login related PDU's exp_statsn is handled in
1263 * userspace
1264 */
1265 goto recv_pdu;
1266 case ISCSI_OP_SCSI_TMFUNC_RSP:
1267 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1268 if (datalen) {
1269 rc = ISCSI_ERR_PROTO;
1270 break;
1271 }
1272
1273 iscsi_tmf_rsp(conn, hdr);
b3cd5050 1274 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
3e5c28ad
MC		 1275 break;
1276 case ISCSI_OP_NOOP_IN:
1277 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1278 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1279 rc = ISCSI_ERR_PROTO;
1280 break;
1281 }
1282 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1283
8afa1439
MC		 1284 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1285 data, datalen);
3e5c28ad
MC		 1286 break;
1287 default:
1288 rc = ISCSI_ERR_BAD_OPCODE;
1289 break;
1290 }
7996a778 1291
3e5c28ad
MC		 1292out:
1293 return rc;
1294recv_pdu:
1295 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1296 rc = ISCSI_ERR_CONN_FAILED;
b3cd5050 1297 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1298 return rc;
1299}
913e5bf4 1300EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 1301
1302int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1303 char *data, int datalen)
1304{
1305 int rc;
1306
659743b0 1307 spin_lock(&conn->session->back_lock);
7996a778 1308 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
659743b0 1309 spin_unlock(&conn->session->back_lock);
7996a778
MC		 1310 return rc;
1311}
1312EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1313
0af967f5 1314int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 1315{
1316 struct iscsi_session *session = conn->session;
262ef636 1317 int age = 0, i = 0;
7996a778 1318
0af967f5
MC		 1319 if (itt == RESERVED_ITT)
1320 return 0;
7996a778 1321
262ef636
MC		 1322 if (session->tt->parse_pdu_itt)
1323 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1324 else {
1325 i = get_itt(itt);
1326 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1327 }
1328
1329 if (age != session->age) {
0af967f5
MC		 1330 iscsi_conn_printk(KERN_ERR, conn,
1331 "received itt %x expected session age (%x)\n",
913e5bf4 1332 (__force u32)itt, session->age);
0af967f5
MC		 1333 return ISCSI_ERR_BAD_ITT;
1334 }
7996a778 1335
3e5c28ad
MC		 1336 if (i >= session->cmds_max) {
1337 iscsi_conn_printk(KERN_ERR, conn,
1338 "received invalid itt index %u (max cmds "
1339 "%u.\n", i, session->cmds_max);
1340 return ISCSI_ERR_BAD_ITT;
7996a778 1341 }
7996a778
MC		 1342 return 0;
1343}
1344EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1345
913e5bf4
MC		 1346/**
1347 * iscsi_itt_to_ctask - look up ctask by itt
1348 * @conn: iscsi connection
1349 * @itt: itt
1350 *
1351 * This should be used for cmd tasks.
1352 *
659743b0 1353 * The session back_lock must be held.
913e5bf4
MC		 1354 */
1355struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 1356{
9c19a7d0 1357 struct iscsi_task *task;
0af967f5
MC		 1358
1359 if (iscsi_verify_itt(conn, itt))
1360 return NULL;
1361
913e5bf4
MC		 1362 task = iscsi_itt_to_task(conn, itt);
1363 if (!task || !task->sc)
0af967f5
MC		 1364 return NULL;
1365
913e5bf4
MC		 1366 if (task->sc->SCp.phase != conn->session->age) {
1367 iscsi_session_printk(KERN_ERR, conn->session,
1368 "task's session age %d, expected %d\n",
1369 task->sc->SCp.phase, conn->session->age);
0af967f5 1370 return NULL;
913e5bf4 1371 }
0af967f5 1372
9c19a7d0 1373 return task;
0af967f5
MC		 1374}
1375EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1376
40a06e75 1377void iscsi_session_failure(struct iscsi_session *session,
e5bd7b54
MC		 1378 enum iscsi_err err)
1379{
e5bd7b54
MC		 1380 struct iscsi_conn *conn;
1381 struct device *dev;
e5bd7b54 1382
659743b0 1383 spin_lock_bh(&session->frwd_lock);
e5bd7b54
MC		 1384 conn = session->leadconn;
1385 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
659743b0 1386 spin_unlock_bh(&session->frwd_lock);
e5bd7b54
MC		 1387 return;
1388 }
1389
1390 dev = get_device(&conn->cls_conn->dev);
659743b0 1391 spin_unlock_bh(&session->frwd_lock);
e5bd7b54
MC		 1392 if (!dev)
1393 return;
1394 /*
1395 * if the host is being removed bypass the connection
1396 * recovery initialization because we are going to kill
1397 * the session.
1398 */
1399 if (err == ISCSI_ERR_INVALID_HOST)
1400 iscsi_conn_error_event(conn->cls_conn, err);
1401 else
1402 iscsi_conn_failure(conn, err);
1403 put_device(dev);
1404}
1405EXPORT_SYMBOL_GPL(iscsi_session_failure);
1406
7996a778
MC		 1407void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1408{
1409 struct iscsi_session *session = conn->session;
7996a778 1410
659743b0 1411 spin_lock_bh(&session->frwd_lock);
656cffc9 1412 if (session->state == ISCSI_STATE_FAILED) {
659743b0 1413 spin_unlock_bh(&session->frwd_lock);
656cffc9
MC		 1414 return;
1415 }
1416
67a61114 1417 if (conn->stop_stage == 0)
7996a778 1418 session->state = ISCSI_STATE_FAILED;
659743b0 1419 spin_unlock_bh(&session->frwd_lock);
e5bd7b54 1420
7996a778
MC		 1421 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1422 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1423 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1424}
1425EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1426
77a23c21
MC		 1427static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1428{
1429 struct iscsi_session *session = conn->session;
1430
1431 /*
1432 * Check for iSCSI window and take care of CmdSN wrap-around
1433 */
e0726407 1434 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1b2c7af8
MC		 1435 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1436 "%u MaxCmdSN %u CmdSN %u/%u\n",
1437 session->exp_cmdsn, session->max_cmdsn,
1438 session->cmdsn, session->queued_cmdsn);
77a23c21
MC		 1439 return -ENOSPC;
1440 }
1441 return 0;
1442}
1443
9c19a7d0 1444static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1445{
9c19a7d0 1446 struct iscsi_task *task = conn->task;
843c0a8a 1447 int rc;
77a23c21 1448
70b31c15
MC		 1449 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1450 return -ENODATA;
1451
9c19a7d0 1452 __iscsi_get_task(task);
659743b0 1453 spin_unlock_bh(&conn->session->frwd_lock);
9c19a7d0 1454 rc = conn->session->tt->xmit_task(task);
659743b0 1455 spin_lock_bh(&conn->session->frwd_lock);
d355e57d 1456 if (!rc) {
9c19a7d0 1457 /* done with this task */
d355e57d 1458 task->last_xfer = jiffies;
9c19a7d0 1459 conn->task = NULL;
d355e57d 1460 }
659743b0 1461 /* regular RX path uses back_lock */
72b97402 1462 spin_lock(&conn->session->back_lock);
d355e57d 1463 __iscsi_put_task(task);
72b97402 1464 spin_unlock(&conn->session->back_lock);
77a23c21
MC		 1465 return rc;
1466}
1467
843c0a8a 1468/**
9c19a7d0
MC		 1469 * iscsi_requeue_task - requeue task to run from session workqueue
1470 * @task: task to requeue
843c0a8a 1471 *
9c19a7d0 1472 * LLDs that need to run a task from the session workqueue should call
659743b0 1473 * this. The session frwd_lock must be held. This should only be called
052d0144 1474 * by software drivers.
843c0a8a 1475 */
9c19a7d0 1476void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1477{
9c19a7d0 1478 struct iscsi_conn *conn = task->conn;
843c0a8a 1479
3bbaaad9
MC		 1480 /*
1481 * this may be on the requeue list already if the xmit_task callout
1482 * is handling the r2ts while we are adding new ones
1483 */
6f8830f5 1484 spin_lock_bh(&conn->taskqueuelock);
3bbaaad9
MC		 1485 if (list_empty(&task->running))
1486 list_add_tail(&task->running, &conn->requeue);
6f8830f5 1487 spin_unlock_bh(&conn->taskqueuelock);
32ae763e 1488 iscsi_conn_queue_work(conn);
843c0a8a 1489}
9c19a7d0 1490EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1491
7996a778
MC		 1492/**
1493 * iscsi_data_xmit - xmit any command into the scheduled connection
1494 * @conn: iscsi connection
1495 *
1496 * Notes:
1497 * The function can return -EAGAIN in which case the caller must
1498 * re-schedule it again later or recover. '0' return code means
1499 * successful xmit.
1500 **/
1501static int iscsi_data_xmit(struct iscsi_conn *conn)
1502{
5d12c05e 1503 struct iscsi_task *task;
3219e529 1504 int rc = 0;
7996a778 1505
659743b0 1506 spin_lock_bh(&conn->session->frwd_lock);
70b31c15 1507 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1b2c7af8 1508 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
659743b0 1509 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1510 return -ENODATA;
7996a778 1511 }
7996a778 1512
9c19a7d0
MC		 1513 if (conn->task) {
1514 rc = iscsi_xmit_task(conn);
3219e529 1515 if (rc)
70b31c15 1516 goto done;
7996a778
MC		 1517 }
1518
77a23c21
MC		 1519 /*
1520 * process mgmt pdus like nops before commands since we should
1521 * only have one nop-out as a ping from us and targets should not
1522 * overflow us with nop-ins
1523 */
6f8830f5 1524 spin_lock_bh(&conn->taskqueuelock);
77a23c21 1525check_mgmt:
843c0a8a 1526 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1527 conn->task = list_entry(conn->mgmtqueue.next,
1528 struct iscsi_task, running);
3bbaaad9 1529 list_del_init(&conn->task->running);
6f8830f5 1530 spin_unlock_bh(&conn->taskqueuelock);
9c19a7d0 1531 if (iscsi_prep_mgmt_task(conn, conn->task)) {
659743b0
SP		 1532 /* regular RX path uses back_lock */
1533 spin_lock_bh(&conn->session->back_lock);
9c19a7d0 1534 __iscsi_put_task(conn->task);
659743b0 1535 spin_unlock_bh(&conn->session->back_lock);
9c19a7d0 1536 conn->task = NULL;
6f8830f5 1537 spin_lock_bh(&conn->taskqueuelock);
b3a7ea8d
MC		 1538 continue;
1539 }
9c19a7d0 1540 rc = iscsi_xmit_task(conn);
77a23c21 1541 if (rc)
70b31c15 1542 goto done;
6f8830f5 1543 spin_lock_bh(&conn->taskqueuelock);
7996a778
MC		 1544 }
1545
843c0a8a 1546 /* process pending command queue */
3bbaaad9 1547 while (!list_empty(&conn->cmdqueue)) {
5d12c05e
MC		 1548 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1549 running);
3bbaaad9 1550 list_del_init(&conn->task->running);
6f8830f5 1551 spin_unlock_bh(&conn->taskqueuelock);
b3a7ea8d 1552 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
b3cd5050 1553 fail_scsi_task(conn->task, DID_IMM_RETRY);
6f8830f5 1554 spin_lock_bh(&conn->taskqueuelock);
b3a7ea8d
MC		 1555 continue;
1556 }
577577da
MC		 1557 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1558 if (rc) {
5d12c05e 1559 if (rc == -ENOMEM || rc == -EACCES) {
6f8830f5 1560 spin_lock_bh(&conn->taskqueuelock);
3bbaaad9
MC		 1561 list_add_tail(&conn->task->running,
1562 &conn->cmdqueue);
577577da 1563 conn->task = NULL;
6f8830f5 1564 spin_unlock_bh(&conn->taskqueuelock);
70b31c15 1565 goto done;
577577da 1566 } else
b3cd5050 1567 fail_scsi_task(conn->task, DID_ABORT);
6f8830f5 1568 spin_lock_bh(&conn->taskqueuelock);
004d6530
BH		 1569 continue;
1570 }
9c19a7d0 1571 rc = iscsi_xmit_task(conn);
77a23c21 1572 if (rc)
70b31c15 1573 goto done;
77a23c21 1574 /*
9c19a7d0 1575 * we could continuously get new task requests so
77a23c21
MC		 1576 * we need to check the mgmt queue for nops that need to
1577 * be sent to aviod starvation
1578 */
6f8830f5 1579 spin_lock_bh(&conn->taskqueuelock);
843c0a8a
MC		 1580 if (!list_empty(&conn->mgmtqueue))
1581 goto check_mgmt;
1582 }
1583
1584 while (!list_empty(&conn->requeue)) {
b3a7ea8d
MC		 1585 /*
1586 * we always do fastlogout - conn stop code will clean up.
1587 */
1588 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1589 break;
1590
5d12c05e
MC		 1591 task = list_entry(conn->requeue.next, struct iscsi_task,
1592 running);
1593 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1594 break;
1595
1596 conn->task = task;
3bbaaad9 1597 list_del_init(&conn->task->running);
9c19a7d0 1598 conn->task->state = ISCSI_TASK_RUNNING;
6f8830f5 1599 spin_unlock_bh(&conn->taskqueuelock);
9c19a7d0 1600 rc = iscsi_xmit_task(conn);
843c0a8a 1601 if (rc)
70b31c15 1602 goto done;
6f8830f5 1603 spin_lock_bh(&conn->taskqueuelock);
843c0a8a 1604 if (!list_empty(&conn->mgmtqueue))
77a23c21 1605 goto check_mgmt;
7996a778 1606 }
6f8830f5 1607 spin_unlock_bh(&conn->taskqueuelock);
659743b0 1608 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1609 return -ENODATA;
7996a778 1610
70b31c15 1611done:
659743b0 1612 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1613 return rc;
7996a778
MC		 1614}
1615
c4028958 1616static void iscsi_xmitworker(struct work_struct *work)
7996a778 1617{
c4028958
DH		 1618 struct iscsi_conn *conn =
1619 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1620 int rc;
7996a778
MC		 1621 /*
1622 * serialize Xmit worker on a per-connection basis.
1623 */
3219e529
MC		 1624 do {
1625 rc = iscsi_data_xmit(conn);
1626 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1627}
1628
577577da
MC		 1629static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1630 struct scsi_cmnd *sc)
1631{
1632 struct iscsi_task *task;
1633
7acd72eb 1634 if (!kfifo_out(&conn->session->cmdpool.queue,
577577da
MC		 1635 (void *) &task, sizeof(void *)))
1636 return NULL;
1637
1638 sc->SCp.phase = conn->session->age;
1639 sc->SCp.ptr = (char *) task;
1640
6dc618cd 1641 refcount_set(&task->refcount, 1);
577577da
MC		 1642 task->state = ISCSI_TASK_PENDING;
1643 task->conn = conn;
1644 task->sc = sc;
d355e57d
MC		 1645 task->have_checked_conn = false;
1646 task->last_timeout = jiffies;
1647 task->last_xfer = jiffies;
55e51eda 1648 task->protected = false;
577577da
MC		 1649 INIT_LIST_HEAD(&task->running);
1650 return task;
1651}
1652
7996a778
MC		 1653enum {
1654 FAILURE_BAD_HOST = 1,
1655 FAILURE_SESSION_FAILED,
1656 FAILURE_SESSION_FREED,
1657 FAILURE_WINDOW_CLOSED,
60ecebf5 1658 FAILURE_OOM,
7996a778 1659 FAILURE_SESSION_TERMINATE,
656cffc9 1660 FAILURE_SESSION_IN_RECOVERY,
7996a778 1661 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1662 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1663 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1664};
1665
f41d4721 1666int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
7996a778 1667{
75613521 1668 struct iscsi_cls_session *cls_session;
1336aed1 1669 struct iscsi_host *ihost;
7996a778
MC		 1670 int reason = 0;
1671 struct iscsi_session *session;
1672 struct iscsi_conn *conn;
9c19a7d0 1673 struct iscsi_task *task = NULL;
7996a778 1674
7996a778 1675 sc->result = 0;
f47f2cf5 1676 sc->SCp.ptr = NULL;
7996a778 1677
1336aed1 1678 ihost = shost_priv(host);
7996a778 1679
75613521
MC		 1680 cls_session = starget_to_session(scsi_target(sc->device));
1681 session = cls_session->dd_data;
659743b0 1682 spin_lock_bh(&session->frwd_lock);
7996a778 1683
75613521 1684 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1685 if (reason) {
1686 sc->result = reason;
1687 goto fault;
1688 }
1689
301e0f7e 1690 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9
MC		 1691 /*
1692 * to handle the race between when we set the recovery state
1693 * and block the session we requeue here (commands could
1694 * be entering our queuecommand while a block is starting
1695 * up because the block code is not locked)
1696 */
9000bcd6 1697 switch (session->state) {
301e0f7e 1698 case ISCSI_STATE_FAILED:
d7549412
RDT		 1699 /*
1700 * cmds should fail during shutdown, if the session
1701 * state is bad, allowing completion to happen
1702 */
1703 if (unlikely(system_state != SYSTEM_RUNNING)) {
1704 reason = FAILURE_SESSION_FAILED;
1705 sc->result = DID_NO_CONNECT << 16;
1706 break;
1707 }
9000bcd6 1708 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1709 reason = FAILURE_SESSION_IN_RECOVERY;
301e0f7e
MC		 1710 sc->result = DID_IMM_RETRY << 16;
1711 break;
9000bcd6
MC		 1712 case ISCSI_STATE_LOGGING_OUT:
1713 reason = FAILURE_SESSION_LOGGING_OUT;
301e0f7e
MC		 1714 sc->result = DID_IMM_RETRY << 16;
1715 break;
b3a7ea8d 1716 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1717 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1718 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1719 break;
1720 case ISCSI_STATE_TERMINATE:
656cffc9 1721 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1722 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1723 break;
b3a7ea8d 1724 default:
656cffc9 1725 reason = FAILURE_SESSION_FREED;
6eabafbe 1726 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1727 }
7996a778
MC		 1728 goto fault;
1729 }
1730
7996a778 1731 conn = session->leadconn;
98644047
MC		 1732 if (!conn) {
1733 reason = FAILURE_SESSION_FREED;
6eabafbe 1734 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1735 goto fault;
1736 }
7996a778 1737
661134ad
MC		 1738 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1739 reason = FAILURE_SESSION_IN_RECOVERY;
eef9ffdf 1740 sc->result = DID_REQUEUE << 16;
661134ad
MC		 1741 goto fault;
1742 }
1743
77a23c21
MC		 1744 if (iscsi_check_cmdsn_window_closed(conn)) {
1745 reason = FAILURE_WINDOW_CLOSED;
1746 goto reject;
1747 }
1748
577577da
MC		 1749 task = iscsi_alloc_task(conn, sc);
1750 if (!task) {
60ecebf5
MC		 1751 reason = FAILURE_OOM;
1752 goto reject;
1753 }
7996a778 1754
1336aed1 1755 if (!ihost->workq) {
577577da
MC		 1756 reason = iscsi_prep_scsi_cmd_pdu(task);
1757 if (reason) {
5d12c05e 1758 if (reason == -ENOMEM || reason == -EACCES) {
577577da
MC		 1759 reason = FAILURE_OOM;
1760 goto prepd_reject;
1761 } else {
1762 sc->result = DID_ABORT << 16;
1763 goto prepd_fault;
1764 }
052d0144 1765 }
9c19a7d0 1766 if (session->tt->xmit_task(task)) {
d3305f34 1767 session->cmdsn--;
052d0144 1768 reason = FAILURE_SESSION_NOT_READY;
577577da 1769 goto prepd_reject;
052d0144 1770 }
3bbaaad9 1771 } else {
6f8830f5 1772 spin_lock_bh(&conn->taskqueuelock);
3bbaaad9 1773 list_add_tail(&task->running, &conn->cmdqueue);
6f8830f5 1774 spin_unlock_bh(&conn->taskqueuelock);
32ae763e 1775 iscsi_conn_queue_work(conn);
3bbaaad9 1776 }
052d0144
MC		 1777
1778 session->queued_cmdsn++;
659743b0 1779 spin_unlock_bh(&session->frwd_lock);
7996a778
MC		 1780 return 0;
1781
577577da 1782prepd_reject:
f41d4721 1783 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1784reject:
659743b0 1785 spin_unlock_bh(&session->frwd_lock);
1b2c7af8
MC		 1786 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1787 sc->cmnd[0], reason);
d6d13ee1 1788 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778 1789
577577da 1790prepd_fault:
f41d4721 1791 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1792fault:
659743b0 1793 spin_unlock_bh(&session->frwd_lock);
1b2c7af8
MC		 1794 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1795 sc->cmnd[0], reason);
c07d4444
BH		 1796 if (!scsi_bidi_cmnd(sc))
1797 scsi_set_resid(sc, scsi_bufflen(sc));
1798 else {
1799 scsi_out(sc)->resid = scsi_out(sc)->length;
1800 scsi_in(sc)->resid = scsi_in(sc)->length;
1801 }
f41d4721 1802 sc->scsi_done(sc);
7996a778
MC		 1803 return 0;
1804}
1805EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1806
6b5d6c44
MC		 1807int iscsi_target_alloc(struct scsi_target *starget)
1808{
1809 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1810 struct iscsi_session *session = cls_session->dd_data;
1811
1812 starget->can_queue = session->scsi_cmds_max;
1813 return 0;
1814}
1815EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1816
2c4b9637 1817static void iscsi_tmf_timedout(struct timer_list *t)
7996a778 1818{
2c4b9637 1819 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
7996a778
MC		 1820 struct iscsi_session *session = conn->session;
1821
659743b0 1822 spin_lock(&session->frwd_lock);
843c0a8a
MC		 1823 if (conn->tmf_state == TMF_QUEUED) {
1824 conn->tmf_state = TMF_TIMEDOUT;
bd2199d4 1825 ISCSI_DBG_EH(session, "tmf timedout\n");
7996a778
MC		 1826 /* unblock eh_abort() */
1827 wake_up(&conn->ehwait);
1828 }
659743b0 1829 spin_unlock(&session->frwd_lock);
7996a778
MC		 1830}
1831
9c19a7d0 1832static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1833 struct iscsi_tm *hdr, int age,
1834 int timeout)
1360c58a 1835 __must_hold(&session->frwd_lock)
7996a778 1836{
7996a778 1837 struct iscsi_session *session = conn->session;
9c19a7d0 1838 struct iscsi_task *task;
7996a778 1839
9c19a7d0 1840 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1841 NULL, 0);
9c19a7d0 1842 if (!task) {
659743b0 1843 spin_unlock_bh(&session->frwd_lock);
df4da5cd 1844 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
7996a778 1845 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
659743b0 1846 spin_lock_bh(&session->frwd_lock);
77a23c21 1847 return -EPERM;
7996a778 1848 }
843c0a8a 1849 conn->tmfcmd_pdus_cnt++;
f6d5180c 1850 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a 1851 add_timer(&conn->tmf_timer);
bd2199d4 1852 ISCSI_DBG_EH(session, "tmf set timeout\n");
7996a778 1853
659743b0 1854 spin_unlock_bh(&session->frwd_lock);
6724add1 1855 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1856
1857 /*
1858 * block eh thread until:
1859 *
843c0a8a
MC		 1860 * 1) tmf response
1861 * 2) tmf timeout
7996a778
MC		 1862 * 3) session is terminated or restarted or userspace has
1863 * given up on recovery
1864 */
843c0a8a 1865 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1866 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1867 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1868 if (signal_pending(current))
1869 flush_signals(current);
843c0a8a
MC		 1870 del_timer_sync(&conn->tmf_timer);
1871
6724add1 1872 mutex_lock(&session->eh_mutex);
659743b0 1873 spin_lock_bh(&session->frwd_lock);
9c19a7d0 1874 /* if the session drops it will clean up the task */
843c0a8a
MC		 1875 if (age != session->age ||
1876 session->state != ISCSI_STATE_LOGGED_IN)
1877 return -ENOTCONN;
7996a778
MC		 1878 return 0;
1879}
1880
843c0a8a
MC		 1881/*
1882 * Fail commands. session lock held and recv side suspended and xmit
1883 * thread flushed
1884 */
9cb78c16 1885static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
843c0a8a 1886{
3bbaaad9
MC		 1887 struct iscsi_task *task;
1888 int i;
843c0a8a 1889
3bbaaad9
MC		 1890 for (i = 0; i < conn->session->cmds_max; i++) {
1891 task = conn->session->cmds[i];
1892 if (!task->sc || task->state == ISCSI_TASK_FREE)
1893 continue;
843c0a8a 1894
3bbaaad9
MC		 1895 if (lun != -1 && lun != task->sc->device->lun)
1896 continue;
843c0a8a 1897
3bbaaad9
MC		 1898 ISCSI_DBG_SESSION(conn->session,
1899 "failing sc %p itt 0x%x state %d\n",
1900 task->sc, task->itt, task->state);
b3cd5050 1901 fail_scsi_task(task, error);
843c0a8a
MC		 1902 }
1903}
1904
661134ad
MC		 1905/**
1906 * iscsi_suspend_queue - suspend iscsi_queuecommand
1907 * @conn: iscsi conn to stop queueing IO on
1908 *
659743b0 1909 * This grabs the session frwd_lock to make sure no one is in
661134ad
MC		 1910 * xmit_task/queuecommand, and then sets suspend to prevent
1911 * new commands from being queued. This only needs to be called
1912 * by offload drivers that need to sync a path like ep disconnect
1913 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1914 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1915 */
1916void iscsi_suspend_queue(struct iscsi_conn *conn)
1917{
659743b0 1918 spin_lock_bh(&conn->session->frwd_lock);
661134ad 1919 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
659743b0 1920 spin_unlock_bh(&conn->session->frwd_lock);
661134ad
MC		 1921}
1922EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1923
1924/**
1925 * iscsi_suspend_tx - suspend iscsi_data_xmit
1926 * @conn: iscsi conn tp stop processing IO on.
1927 *
1928 * This function sets the suspend bit to prevent iscsi_data_xmit
1929 * from sending new IO, and if work is queued on the xmit thread
1930 * it will wait for it to be completed.
1931 */
b40977d9 1932void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1 1933{
32ae763e
MC		 1934 struct Scsi_Host *shost = conn->session->host;
1935 struct iscsi_host *ihost = shost_priv(shost);
1936
6724add1 1937 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1938 if (ihost->workq)
32ae763e 1939 flush_workqueue(ihost->workq);
6724add1 1940}
b40977d9 1941EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1942
1943static void iscsi_start_tx(struct iscsi_conn *conn)
1944{
1945 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1946 iscsi_conn_queue_work(conn);
6724add1
MC		 1947}
1948
4c48a829
MC		 1949/*
1950 * We want to make sure a ping is in flight. It has timed out.
1951 * And we are not busy processing a pdu that is making
1952 * progress but got started before the ping and is taking a while
1953 * to complete so the ping is just stuck behind it in a queue.
1954 */
1955static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1956{
1957 if (conn->ping_task &&
1958 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1959 (conn->ping_timeout * HZ), jiffies))
1960 return 1;
1961 else
1962 return 0;
1963}
1964
b6a05c82 1965enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
f6d5180c 1966{
6600593c 1967 enum blk_eh_timer_return rc = BLK_EH_DONE;
92ed4d69 1968 struct iscsi_task *task = NULL, *running_task;
f6d5180c
MC		 1969 struct iscsi_cls_session *cls_session;
1970 struct iscsi_session *session;
1971 struct iscsi_conn *conn;
92ed4d69 1972 int i;
f6d5180c 1973
d355e57d 1974 cls_session = starget_to_session(scsi_target(sc->device));
75613521 1975 session = cls_session->dd_data;
f6d5180c 1976
bd2199d4 1977 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
f6d5180c 1978
659743b0 1979 spin_lock(&session->frwd_lock);
e3d338a5
MC		 1980 task = (struct iscsi_task *)sc->SCp.ptr;
1981 if (!task) {
1982 /*
1983 * Raced with completion. Blk layer has taken ownership
1984 * so let timeout code complete it now.
1985 */
adb2b769 1986 rc = BLK_EH_DONE;
e3d338a5
MC		 1987 goto done;
1988 }
1989
f6d5180c 1990 if (session->state != ISCSI_STATE_LOGGED_IN) {
d7549412
RDT		 1991 /*
1992 * During shutdown, if session is prematurely disconnected,
1993 * recovery won't happen and there will be hung cmds. Not
1994 * handling cmds would trigger EH, also bad in this case.
1995 * Instead, handle cmd, allow completion to happen and let
1996 * upper layer to deal with the result.
1997 */
1998 if (unlikely(system_state != SYSTEM_RUNNING)) {
1999 sc->result = DID_NO_CONNECT << 16;
2000 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
adb2b769 2001 rc = BLK_EH_DONE;
d7549412
RDT		 2002 goto done;
2003 }
f6d5180c
MC		 2004 /*
2005 * We are probably in the middle of iscsi recovery so let
2006 * that complete and handle the error.
2007 */
242f9dcb 2008 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 2009 goto done;
2010 }
2011
2012 conn = session->leadconn;
2013 if (!conn) {
2014 /* In the middle of shuting down */
242f9dcb 2015 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 2016 goto done;
2017 }
2018
d355e57d
MC		 2019 /*
2020 * If we have sent (at least queued to the network layer) a pdu or
2021 * recvd one for the task since the last timeout ask for
2022 * more time. If on the next timeout we have not made progress
2023 * we can check if it is the task or connection when we send the
2024 * nop as a ping.
2025 */
92ed4d69 2026 if (time_after(task->last_xfer, task->last_timeout)) {
bd2199d4
EZ		 2027 ISCSI_DBG_EH(session, "Command making progress. Asking "
2028 "scsi-ml for more time to complete. "
92ed4d69 2029 "Last data xfer at %lu. Last timeout was at "
bd2199d4 2030 "%lu\n.", task->last_xfer, task->last_timeout);
d355e57d
MC		 2031 task->have_checked_conn = false;
2032 rc = BLK_EH_RESET_TIMER;
2033 goto done;
2034 }
2035
f6d5180c
MC		 2036 if (!conn->recv_timeout && !conn->ping_timeout)
2037 goto done;
2038 /*
2039 * if the ping timedout then we are in the middle of cleaning up
2040 * and can let the iscsi eh handle it
2041 */
4c48a829 2042 if (iscsi_has_ping_timed_out(conn)) {
242f9dcb 2043 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2044 goto done;
2045 }
d355e57d 2046
92ed4d69
MC		 2047 for (i = 0; i < conn->session->cmds_max; i++) {
2048 running_task = conn->session->cmds[i];
2049 if (!running_task->sc || running_task == task ||
2050 running_task->state != ISCSI_TASK_RUNNING)
2051 continue;
2052
2053 /*
2054 * Only check if cmds started before this one have made
2055 * progress, or this could never fail
2056 */
2057 if (time_after(running_task->sc->jiffies_at_alloc,
2058 task->sc->jiffies_at_alloc))
2059 continue;
2060
2061 if (time_after(running_task->last_xfer, task->last_timeout)) {
2062 /*
2063 * This task has not made progress, but a task
2064 * started before us has transferred data since
2065 * we started/last-checked. We could be queueing
2066 * too many tasks or the LU is bad.
2067 *
2068 * If the device is bad the cmds ahead of us on
2069 * other devs will complete, and this loop will
2070 * eventually fail starting the scsi eh.
2071 */
2072 ISCSI_DBG_EH(session, "Command has not made progress "
2073 "but commands ahead of it have. "
2074 "Asking scsi-ml for more time to "
2075 "complete. Our last xfer vs running task "
2076 "last xfer %lu/%lu. Last check %lu.\n",
2077 task->last_xfer, running_task->last_xfer,
2078 task->last_timeout);
2079 rc = BLK_EH_RESET_TIMER;
2080 goto done;
2081 }
2082 }
2083
d355e57d
MC		 2084 /* Assumes nop timeout is shorter than scsi cmd timeout */
2085 if (task->have_checked_conn)
2086 goto done;
2087
f6d5180c 2088 /*
d355e57d
MC		 2089 * Checking the transport already or nop from a cmd timeout still
2090 * running
f6d5180c 2091 */
d355e57d
MC		 2092 if (conn->ping_task) {
2093 task->have_checked_conn = true;
242f9dcb 2094 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2095 goto done;
2096 }
2097
d355e57d
MC		 2098 /* Make sure there is a transport check done */
2099 iscsi_send_nopout(conn, NULL);
2100 task->have_checked_conn = true;
2101 rc = BLK_EH_RESET_TIMER;
2102
f6d5180c 2103done:
d355e57d
MC		 2104 if (task)
2105 task->last_timeout = jiffies;
659743b0 2106 spin_unlock(&session->frwd_lock);
bd2199d4 2107 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
d7549412 2108 "timer reset" : "shutdown or nh");
f6d5180c
MC		 2109 return rc;
2110}
b6a05c82 2111EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
f6d5180c 2112
2c4b9637 2113static void iscsi_check_transport_timeouts(struct timer_list *t)
f6d5180c 2114{
2c4b9637 2115 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
f6d5180c 2116 struct iscsi_session *session = conn->session;
4cf10435 2117 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c 2118
659743b0 2119 spin_lock(&session->frwd_lock);
f6d5180c
MC		 2120 if (session->state != ISCSI_STATE_LOGGED_IN)
2121 goto done;
2122
4cf10435
MC		 2123 recv_timeout = conn->recv_timeout;
2124 if (!recv_timeout)
f6d5180c
MC		 2125 goto done;
2126
4cf10435 2127 recv_timeout *= HZ;
f6d5180c 2128 last_recv = conn->last_recv;
4c48a829
MC		 2129
2130 if (iscsi_has_ping_timed_out(conn)) {
322d739d 2131 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
4c48a829
MC		 2132 "expired, recv timeout %d, last rx %lu, "
2133 "last ping %lu, now %lu\n",
2134 conn->ping_timeout, conn->recv_timeout,
2135 last_recv, conn->last_ping, jiffies);
659743b0 2136 spin_unlock(&session->frwd_lock);
09ff742c 2137 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
f6d5180c
MC		 2138 return;
2139 }
2140
4cf10435 2141 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97 2142 /* send a ping to try to provoke some traffic */
1b2c7af8 2143 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
52f5664a
AN		 2144 if (iscsi_send_nopout(conn, NULL))
2145 next_timeout = jiffies + (1 * HZ);
2146 else
2147 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 2148 } else
4cf10435 2149 next_timeout = last_recv + recv_timeout;
f6d5180c 2150
1b2c7af8 2151 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
ad294e9c 2152 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c 2153done:
659743b0 2154 spin_unlock(&session->frwd_lock);
f6d5180c
MC		 2155}
2156
9c19a7d0 2157static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 2158 struct iscsi_tm *hdr)
2159{
2160 memset(hdr, 0, sizeof(*hdr));
2161 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2162 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2163 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2164 hdr->lun = task->lun;
577577da
MC		 2165 hdr->rtt = task->hdr_itt;
2166 hdr->refcmdsn = task->cmdsn;
843c0a8a
MC		 2167}
2168
7996a778
MC		 2169int iscsi_eh_abort(struct scsi_cmnd *sc)
2170{
75613521
MC		 2171 struct iscsi_cls_session *cls_session;
2172 struct iscsi_session *session;
f47f2cf5 2173 struct iscsi_conn *conn;
9c19a7d0 2174 struct iscsi_task *task;
843c0a8a 2175 struct iscsi_tm *hdr;
e9e410e8 2176 int age;
7996a778 2177
75613521
MC		 2178 cls_session = starget_to_session(scsi_target(sc->device));
2179 session = cls_session->dd_data;
2180
bd2199d4 2181 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
4421c9eb 2182
6724add1 2183 mutex_lock(&session->eh_mutex);
659743b0 2184 spin_lock_bh(&session->frwd_lock);
f47f2cf5
MC		 2185 /*
2186 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2187 * got the command.
2188 */
2189 if (!sc->SCp.ptr) {
bd2199d4
EZ		 2190 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2191 "it completed.\n");
659743b0 2192 spin_unlock_bh(&session->frwd_lock);
6724add1 2193 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 2194 return SUCCESS;
2195 }
2196
7996a778
MC		 2197 /*
2198 * If we are not logged in or we have started a new session
2199 * then let the host reset code handle this
2200 */
843c0a8a
MC		 2201 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2202 sc->SCp.phase != session->age) {
659743b0 2203 spin_unlock_bh(&session->frwd_lock);
843c0a8a 2204 mutex_unlock(&session->eh_mutex);
bd2199d4 2205 ISCSI_DBG_EH(session, "failing abort due to dropped "
4421c9eb 2206 "session.\n");
843c0a8a
MC		 2207 return FAILED;
2208 }
2209
2210 conn = session->leadconn;
2211 conn->eh_abort_cnt++;
2212 age = session->age;
2213
9c19a7d0 2214 task = (struct iscsi_task *)sc->SCp.ptr;
bd2199d4
EZ		 2215 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2216 sc, task->itt);
7996a778 2217
9c19a7d0
MC		 2218 /* task completed before time out */
2219 if (!task->sc) {
bd2199d4 2220 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
77a23c21 2221 goto success;
7ea8b828 2222 }
7996a778 2223
9c19a7d0 2224 if (task->state == ISCSI_TASK_PENDING) {
b3cd5050 2225 fail_scsi_task(task, DID_ABORT);
77a23c21
MC		 2226 goto success;
2227 }
7996a778 2228
843c0a8a
MC		 2229 /* only have one tmf outstanding at a time */
2230 if (conn->tmf_state != TMF_INITIAL)
7996a778 2231 goto failed;
843c0a8a 2232 conn->tmf_state = TMF_QUEUED;
7996a778 2233
843c0a8a 2234 hdr = &conn->tmhdr;
9c19a7d0 2235 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 2236
e9e410e8 2237 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
843c0a8a 2238 goto failed;
843c0a8a
MC		 2239
2240 switch (conn->tmf_state) {
2241 case TMF_SUCCESS:
659743b0 2242 spin_unlock_bh(&session->frwd_lock);
913e5bf4
MC		 2243 /*
2244 * stop tx side incase the target had sent a abort rsp but
2245 * the initiator was still writing out data.
2246 */
6724add1 2247 iscsi_suspend_tx(conn);
77a23c21 2248 /*
913e5bf4
MC		 2249 * we do not stop the recv side because targets have been
2250 * good and have never sent us a successful tmf response
2251 * then sent more data for the cmd.
77a23c21 2252 */
659743b0 2253 spin_lock_bh(&session->frwd_lock);
b3cd5050 2254 fail_scsi_task(task, DID_ABORT);
843c0a8a 2255 conn->tmf_state = TMF_INITIAL;
5d12c05e 2256 memset(hdr, 0, sizeof(*hdr));
659743b0 2257 spin_unlock_bh(&session->frwd_lock);
6724add1 2258 iscsi_start_tx(conn);
77a23c21 2259 goto success_unlocked;
843c0a8a 2260 case TMF_TIMEDOUT:
659743b0 2261 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2262 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2263 goto failed_unlocked;
2264 case TMF_NOT_FOUND:
2265 if (!sc->SCp.ptr) {
2266 conn->tmf_state = TMF_INITIAL;
5d12c05e 2267 memset(hdr, 0, sizeof(*hdr));
9c19a7d0 2268 /* task completed before tmf abort response */
bd2199d4
EZ		 2269 ISCSI_DBG_EH(session, "sc completed while abort in "
2270 "progress\n");
77a23c21 2271 goto success;
7ea8b828
MC		 2272 }
2273 /* fall through */
2274 default:
843c0a8a
MC		 2275 conn->tmf_state = TMF_INITIAL;
2276 goto failed;
7996a778
MC		 2277 }
2278
77a23c21 2279success:
659743b0 2280 spin_unlock_bh(&session->frwd_lock);
77a23c21 2281success_unlocked:
bd2199d4
EZ		 2282 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2283 sc, task->itt);
6724add1 2284 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2285 return SUCCESS;
2286
2287failed:
659743b0 2288 spin_unlock_bh(&session->frwd_lock);
77a23c21 2289failed_unlocked:
bd2199d4
EZ		 2290 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2291 task ? task->itt : 0);
6724add1 2292 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2293 return FAILED;
2294}
2295EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2296
843c0a8a
MC		 2297static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2298{
2299 memset(hdr, 0, sizeof(*hdr));
2300 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2301 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2302 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2303 int_to_scsilun(sc->device->lun, &hdr->lun);
f6d5180c 2304 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 2305}
2306
2307int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2308{
75613521
MC		 2309 struct iscsi_cls_session *cls_session;
2310 struct iscsi_session *session;
843c0a8a
MC		 2311 struct iscsi_conn *conn;
2312 struct iscsi_tm *hdr;
2313 int rc = FAILED;
2314
75613521
MC		 2315 cls_session = starget_to_session(scsi_target(sc->device));
2316 session = cls_session->dd_data;
2317
9cb78c16
HR		 2318 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2319 sc->device->lun);
843c0a8a
MC		 2320
2321 mutex_lock(&session->eh_mutex);
659743b0 2322 spin_lock_bh(&session->frwd_lock);
843c0a8a
MC		 2323 /*
2324 * Just check if we are not logged in. We cannot check for
2325 * the phase because the reset could come from a ioctl.
2326 */
2327 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2328 goto unlock;
2329 conn = session->leadconn;
2330
2331 /* only have one tmf outstanding at a time */
2332 if (conn->tmf_state != TMF_INITIAL)
2333 goto unlock;
2334 conn->tmf_state = TMF_QUEUED;
2335
2336 hdr = &conn->tmhdr;
2337 iscsi_prep_lun_reset_pdu(sc, hdr);
2338
9c19a7d0 2339 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 2340 session->lu_reset_timeout)) {
843c0a8a
MC		 2341 rc = FAILED;
2342 goto unlock;
2343 }
2344
2345 switch (conn->tmf_state) {
2346 case TMF_SUCCESS:
2347 break;
2348 case TMF_TIMEDOUT:
659743b0 2349 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2350 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2351 goto done;
2352 default:
2353 conn->tmf_state = TMF_INITIAL;
2354 goto unlock;
2355 }
2356
2357 rc = SUCCESS;
659743b0 2358 spin_unlock_bh(&session->frwd_lock);
843c0a8a
MC		 2359
2360 iscsi_suspend_tx(conn);
913e5bf4 2361
659743b0 2362 spin_lock_bh(&session->frwd_lock);
5d12c05e 2363 memset(hdr, 0, sizeof(*hdr));
3bbaaad9 2364 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
843c0a8a 2365 conn->tmf_state = TMF_INITIAL;
659743b0 2366 spin_unlock_bh(&session->frwd_lock);
843c0a8a
MC		 2367
2368 iscsi_start_tx(conn);
2369 goto done;
2370
2371unlock:
659743b0 2372 spin_unlock_bh(&session->frwd_lock);
843c0a8a 2373done:
bd2199d4
EZ		 2374 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2375 rc == SUCCESS ? "SUCCESS" : "FAILED");
843c0a8a
MC		 2376 mutex_unlock(&session->eh_mutex);
2377 return rc;
2378}
2379EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2380
3fe5ae8b
MC		 2381void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2382{
2383 struct iscsi_session *session = cls_session->dd_data;
2384
659743b0 2385 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2386 if (session->state != ISCSI_STATE_LOGGED_IN) {
2387 session->state = ISCSI_STATE_RECOVERY_FAILED;
2388 if (session->leadconn)
2389 wake_up(&session->leadconn->ehwait);
2390 }
659743b0 2391 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2392}
2393EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2394
2395/**
2396 * iscsi_eh_session_reset - drop session and attempt relogin
2397 * @sc: scsi command
2398 *
2399 * This function will wait for a relogin, session termination from
2400 * userspace, or a recovery/replacement timeout.
2401 */
309ce156 2402int iscsi_eh_session_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2403{
2404 struct iscsi_cls_session *cls_session;
2405 struct iscsi_session *session;
2406 struct iscsi_conn *conn;
2407
2408 cls_session = starget_to_session(scsi_target(sc->device));
2409 session = cls_session->dd_data;
2410 conn = session->leadconn;
2411
2412 mutex_lock(&session->eh_mutex);
659743b0 2413 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2414 if (session->state == ISCSI_STATE_TERMINATE) {
2415failed:
2416 ISCSI_DBG_EH(session,
2417 "failing session reset: Could not log back into "
2418 "%s, %s [age %d]\n", session->targetname,
2419 conn->persistent_address, session->age);
659743b0 2420 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2421 mutex_unlock(&session->eh_mutex);
2422 return FAILED;
2423 }
2424
659743b0 2425 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2426 mutex_unlock(&session->eh_mutex);
2427 /*
2428 * we drop the lock here but the leadconn cannot be destoyed while
2429 * we are in the scsi eh
2430 */
df4da5cd 2431 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2432
2433 ISCSI_DBG_EH(session, "wait for relogin\n");
2434 wait_event_interruptible(conn->ehwait,
2435 session->state == ISCSI_STATE_TERMINATE ||
2436 session->state == ISCSI_STATE_LOGGED_IN ||
2437 session->state == ISCSI_STATE_RECOVERY_FAILED);
2438 if (signal_pending(current))
2439 flush_signals(current);
2440
2441 mutex_lock(&session->eh_mutex);
659743b0 2442 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2443 if (session->state == ISCSI_STATE_LOGGED_IN) {
2444 ISCSI_DBG_EH(session,
2445 "session reset succeeded for %s,%s\n",
2446 session->targetname, conn->persistent_address);
2447 } else
2448 goto failed;
659743b0 2449 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2450 mutex_unlock(&session->eh_mutex);
2451 return SUCCESS;
2452}
309ce156 2453EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
3fe5ae8b
MC		 2454
2455static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2456{
2457 memset(hdr, 0, sizeof(*hdr));
2458 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2459 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2460 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2461 hdr->rtt = RESERVED_ITT;
2462}
2463
2464/**
2465 * iscsi_eh_target_reset - reset target
2466 * @sc: scsi command
2467 *
309ce156 2468 * This will attempt to send a warm target reset.
3fe5ae8b 2469 */
3907adf6 2470static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2471{
2472 struct iscsi_cls_session *cls_session;
2473 struct iscsi_session *session;
2474 struct iscsi_conn *conn;
2475 struct iscsi_tm *hdr;
2476 int rc = FAILED;
2477
2478 cls_session = starget_to_session(scsi_target(sc->device));
2479 session = cls_session->dd_data;
2480
2481 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2482 session->targetname);
2483
2484 mutex_lock(&session->eh_mutex);
659743b0 2485 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2486 /*
2487 * Just check if we are not logged in. We cannot check for
2488 * the phase because the reset could come from a ioctl.
2489 */
2490 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2491 goto unlock;
2492 conn = session->leadconn;
2493
2494 /* only have one tmf outstanding at a time */
2495 if (conn->tmf_state != TMF_INITIAL)
2496 goto unlock;
2497 conn->tmf_state = TMF_QUEUED;
2498
2499 hdr = &conn->tmhdr;
2500 iscsi_prep_tgt_reset_pdu(sc, hdr);
2501
2502 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2503 session->tgt_reset_timeout)) {
2504 rc = FAILED;
2505 goto unlock;
2506 }
2507
2508 switch (conn->tmf_state) {
2509 case TMF_SUCCESS:
2510 break;
2511 case TMF_TIMEDOUT:
659743b0 2512 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2513 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2514 goto done;
2515 default:
2516 conn->tmf_state = TMF_INITIAL;
2517 goto unlock;
2518 }
2519
2520 rc = SUCCESS;
659743b0 2521 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2522
2523 iscsi_suspend_tx(conn);
2524
659743b0 2525 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2526 memset(hdr, 0, sizeof(*hdr));
2527 fail_scsi_tasks(conn, -1, DID_ERROR);
2528 conn->tmf_state = TMF_INITIAL;
659743b0 2529 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2530
2531 iscsi_start_tx(conn);
2532 goto done;
2533
2534unlock:
659743b0 2535 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2536done:
2537 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2538 rc == SUCCESS ? "SUCCESS" : "FAILED");
2539 mutex_unlock(&session->eh_mutex);
309ce156
JK		 2540 return rc;
2541}
3fe5ae8b 2542
309ce156
JK		 2543/**
2544 * iscsi_eh_recover_target - reset target and possibly the session
2545 * @sc: scsi command
2546 *
2547 * This will attempt to send a warm target reset. If that fails,
2548 * we will escalate to ERL0 session recovery.
2549 */
2550int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2551{
2552 int rc;
2553
2554 rc = iscsi_eh_target_reset(sc);
3fe5ae8b
MC		 2555 if (rc == FAILED)
2556 rc = iscsi_eh_session_reset(sc);
2557 return rc;
2558}
309ce156 2559EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
3fe5ae8b 2560
6320377f
OK		 2561/*
2562 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2563 * should be accessed via kfifo_{get,put} on q->queue.
2564 * Optionally, the caller can obtain the array of object pointers
2565 * by passing in a non-NULL @items pointer
2566 */
7996a778 2567int
6320377f 2568iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 2569{
6320377f 2570 int i, num_arrays = 1;
7996a778 2571
6320377f 2572 memset(q, 0, sizeof(*q));
7996a778
MC		 2573
2574 q->max = max;
6320377f
OK		 2575
2576 /* If the user passed an items pointer, he wants a copy of
2577 * the array. */
2578 if (items)
2579 num_arrays++;
778e1cdd 2580 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
6320377f 2581 if (q->pool == NULL)
f474a37b 2582 return -ENOMEM;
7996a778 2583
c1e13f25 2584 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
7996a778
MC		 2585
2586 for (i = 0; i < max; i++) {
6320377f 2587 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 2588 if (q->pool[i] == NULL) {
6320377f
OK		 2589 q->max = i;
2590 goto enomem;
7996a778 2591 }
7acd72eb 2592 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
7996a778 2593 }
6320377f
OK		 2594
2595 if (items) {
2596 *items = q->pool + max;
2597 memcpy(*items, q->pool, max * sizeof(void *));
2598 }
2599
7996a778 2600 return 0;
6320377f
OK		 2601
2602enomem:
2603 iscsi_pool_free(q);
2604 return -ENOMEM;
7996a778
MC		 2605}
2606EXPORT_SYMBOL_GPL(iscsi_pool_init);
2607
6320377f 2608void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 2609{
2610 int i;
2611
2612 for (i = 0; i < q->max; i++)
6320377f 2613 kfree(q->pool[i]);
bfcc62ed 2614 kvfree(q->pool);
7996a778
MC		 2615}
2616EXPORT_SYMBOL_GPL(iscsi_pool_free);
2617
a4804cd6
MC		 2618/**
2619 * iscsi_host_add - add host to system
2620 * @shost: scsi host
2621 * @pdev: parent device
2622 *
2623 * This should be called by partial offload and software iscsi drivers
2624 * to add a host to the system.
2625 */
2626int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2627{
8e9a20ce
MC		 2628 if (!shost->can_queue)
2629 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2630
4d108350
MC		 2631 if (!shost->cmd_per_lun)
2632 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2633
a4804cd6
MC		 2634 return scsi_add_host(shost, pdev);
2635}
2636EXPORT_SYMBOL_GPL(iscsi_host_add);
2637
2638/**
2639 * iscsi_host_alloc - allocate a host and driver data
2640 * @sht: scsi host template
2641 * @dd_data_size: driver host data size
32ae763e 2642 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
a4804cd6
MC		 2643 *
2644 * This should be called by partial offload and software iscsi drivers.
2645 * To access the driver specific memory use the iscsi_host_priv() macro.
2646 */
2647struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
4d108350 2648 int dd_data_size, bool xmit_can_sleep)
75613521 2649{
a4804cd6 2650 struct Scsi_Host *shost;
e5bd7b54 2651 struct iscsi_host *ihost;
a4804cd6
MC		 2652
2653 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2654 if (!shost)
2655 return NULL;
e5bd7b54 2656 ihost = shost_priv(shost);
32ae763e
MC		 2657
2658 if (xmit_can_sleep) {
2659 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2660 "iscsi_q_%d", shost->host_no);
2661 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2662 if (!ihost->workq)
2663 goto free_host;
2664 }
2665
e5bd7b54
MC		 2666 spin_lock_init(&ihost->lock);
2667 ihost->state = ISCSI_HOST_SETUP;
2668 ihost->num_sessions = 0;
2669 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6 2670 return shost;
32ae763e
MC		 2671
2672free_host:
2673 scsi_host_put(shost);
2674 return NULL;
a4804cd6
MC		 2675}
2676EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2677
e5bd7b54
MC		 2678static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2679{
40a06e75 2680 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
e5bd7b54
MC		 2681}
2682
a4804cd6
MC		 2683/**
2684 * iscsi_host_remove - remove host and sessions
2685 * @shost: scsi host
2686 *
e5bd7b54
MC		 2687 * If there are any sessions left, this will initiate the removal and wait
2688 * for the completion.
a4804cd6
MC		 2689 */
2690void iscsi_host_remove(struct Scsi_Host *shost)
2691{
e5bd7b54
MC		 2692 struct iscsi_host *ihost = shost_priv(shost);
2693 unsigned long flags;
2694
2695 spin_lock_irqsave(&ihost->lock, flags);
2696 ihost->state = ISCSI_HOST_REMOVED;
2697 spin_unlock_irqrestore(&ihost->lock, flags);
2698
2699 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2700 wait_event_interruptible(ihost->session_removal_wq,
2701 ihost->num_sessions == 0);
2702 if (signal_pending(current))
2703 flush_signals(current);
2704
a4804cd6 2705 scsi_remove_host(shost);
32ae763e
MC		 2706 if (ihost->workq)
2707 destroy_workqueue(ihost->workq);
75613521 2708}
a4804cd6 2709EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 2710
a4804cd6 2711void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 2712{
2713 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2714
75613521
MC		 2715 kfree(ihost->netdev);
2716 kfree(ihost->hwaddress);
2717 kfree(ihost->initiatorname);
a4804cd6 2718 scsi_host_put(shost);
75613521 2719}
a4804cd6 2720EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2721
e5bd7b54
MC		 2722static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2723{
2724 struct iscsi_host *ihost = shost_priv(shost);
2725 unsigned long flags;
2726
2727 shost = scsi_host_get(shost);
2728 if (!shost) {
2729 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2730 "of session teardown event because host already "
2731 "removed.\n");
2732 return;
2733 }
2734
2735 spin_lock_irqsave(&ihost->lock, flags);
2736 ihost->num_sessions--;
2737 if (ihost->num_sessions == 0)
2738 wake_up(&ihost->session_removal_wq);
2739 spin_unlock_irqrestore(&ihost->lock, flags);
2740 scsi_host_put(shost);
2741}
2742
7996a778
MC		 2743/**
2744 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2745 * @iscsit: iscsi transport template
75613521
MC		 2746 * @shost: scsi host
2747 * @cmds_max: session can queue
ccd4a430 2748 * @dd_size: private driver data size, added to session allocation size
9c19a7d0 2749 * @cmd_task_size: LLD task private data size
7996a778 2750 * @initial_cmdsn: initial CmdSN
ccd4a430 2751 * @id: target ID to add to this session
7996a778
MC		 2752 *
2753 * This can be used by software iscsi_transports that allocate
2754 * a session per scsi host.
3cf7b233
MC		 2755 *
2756 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2757 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2758 * for nop handling and login/logout requests.
75613521 2759 */
7996a778 2760struct iscsi_cls_session *
75613521 2761iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
b8b9e1b8 2762 uint16_t cmds_max, int dd_size, int cmd_task_size,
7970634b 2763 uint32_t initial_cmdsn, unsigned int id)
7996a778 2764{
e5bd7b54 2765 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2766 struct iscsi_session *session;
2767 struct iscsi_cls_session *cls_session;
3cf7b233 2768 int cmd_i, scsi_cmds, total_cmds = cmds_max;
e5bd7b54
MC		 2769 unsigned long flags;
2770
2771 spin_lock_irqsave(&ihost->lock, flags);
2772 if (ihost->state == ISCSI_HOST_REMOVED) {
2773 spin_unlock_irqrestore(&ihost->lock, flags);
2774 return NULL;
2775 }
2776 ihost->num_sessions++;
2777 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce
MC		 2778
2779 if (!total_cmds)
2780 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 2781 /*
3cf7b233
MC		 2782 * The iscsi layer needs some tasks for nop handling and tmfs,
2783 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2784 * + 1 command for scsi IO.
3e5c28ad 2785 */
3cf7b233
MC		 2786 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2787 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2788 "must be a power of two that is at least %d.\n",
2789 total_cmds, ISCSI_TOTAL_CMDS_MIN);
e5bd7b54 2790 goto dec_session_count;
3cf7b233
MC		 2791 }
2792
2793 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2794 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2795 "must be a power of 2 less than or equal to %d.\n",
2796 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2797 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2798 }
2799
2800 if (!is_power_of_2(total_cmds)) {
2801 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2802 "must be a power of 2.\n", total_cmds);
2803 total_cmds = rounddown_pow_of_two(total_cmds);
2804 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2805 return NULL;
2806 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2807 total_cmds);
1548271e 2808 }
3cf7b233 2809 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2810
5d91e209 2811 cls_session = iscsi_alloc_session(shost, iscsit,
b8b9e1b8
JK		 2812 sizeof(struct iscsi_session) +
2813 dd_size);
75613521 2814 if (!cls_session)
e5bd7b54 2815 goto dec_session_count;
75613521
MC		 2816 session = cls_session->dd_data;
2817 session->cls_session = cls_session;
7996a778
MC		 2818 session->host = shost;
2819 session->state = ISCSI_STATE_FREE;
f6d5180c 2820 session->fast_abort = 1;
3fe5ae8b 2821 session->tgt_reset_timeout = 30;
4cd49ea1
MC		 2822 session->lu_reset_timeout = 15;
2823 session->abort_timeout = 10;
3cf7b233
MC		 2824 session->scsi_cmds_max = scsi_cmds;
2825 session->cmds_max = total_cmds;
e0726407 2826 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2827 session->exp_cmdsn = initial_cmdsn + 1;
2828 session->max_cmdsn = initial_cmdsn + 1;
2829 session->max_r2t = 1;
2830 session->tt = iscsit;
b8b9e1b8 2831 session->dd_data = cls_session->dd_data + sizeof(*session);
659743b0 2832
6724add1 2833 mutex_init(&session->eh_mutex);
659743b0
SP		 2834 spin_lock_init(&session->frwd_lock);
2835 spin_lock_init(&session->back_lock);
7996a778
MC		 2836
2837 /* initialize SCSI PDU commands pool */
2838 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2839 (void***)&session->cmds,
9c19a7d0 2840 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2841 goto cmdpool_alloc_fail;
2842
2843 /* pre-format cmds pool with ITT */
2844 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2845 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2846
9c19a7d0
MC		 2847 if (cmd_task_size)
2848 task->dd_data = &task[1];
2849 task->itt = cmd_i;
3bbaaad9 2850 task->state = ISCSI_TASK_FREE;
9c19a7d0 2851 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2852 }
2853
f53a88da 2854 if (!try_module_get(iscsit->owner))
75613521 2855 goto module_get_fail;
7996a778 2856
7970634b 2857 if (iscsi_add_session(cls_session, id))
75613521 2858 goto cls_session_fail;
e5bd7b54 2859
7996a778
MC		 2860 return cls_session;
2861
2862cls_session_fail:
75613521
MC		 2863 module_put(iscsit->owner);
2864module_get_fail:
6320377f 2865 iscsi_pool_free(&session->cmdpool);
7996a778 2866cmdpool_alloc_fail:
75613521 2867 iscsi_free_session(cls_session);
e5bd7b54
MC		 2868dec_session_count:
2869 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2870 return NULL;
2871}
2872EXPORT_SYMBOL_GPL(iscsi_session_setup);
2873
2874/**
2875 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2876 * @cls_session: iscsi session
75613521 2877 */
7996a778
MC		 2878void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2879{
75613521 2880 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2881 struct module *owner = cls_session->transport->owner;
e5bd7b54 2882 struct Scsi_Host *shost = session->host;
7996a778 2883
6320377f 2884 iscsi_pool_free(&session->cmdpool);
7996a778 2885
9e10b512
KK		 2886 iscsi_remove_session(cls_session);
2887
b2c64167
MC		 2888 kfree(session->password);
2889 kfree(session->password_in);
2890 kfree(session->username);
2891 kfree(session->username_in);
f3ff0c36 2892 kfree(session->targetname);
3c5c4801 2893 kfree(session->targetalias);
88dfd340 2894 kfree(session->initiatorname);
3b9373e9
EW		 2895 kfree(session->boot_root);
2896 kfree(session->boot_nic);
2897 kfree(session->boot_target);
88dfd340 2898 kfree(session->ifacename);
f8525eb4
AC		 2899 kfree(session->portal_type);
2900 kfree(session->discovery_parent_type);
f3ff0c36 2901
9e10b512
KK		 2902 iscsi_free_session(cls_session);
2903
e5bd7b54 2904 iscsi_host_dec_session_cnt(shost);
63f75cc8 2905 module_put(owner);
7996a778
MC		 2906}
2907EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2908
2909/**
2910 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2911 * @cls_session: iscsi_cls_session
5d91e209 2912 * @dd_size: private driver data size
7996a778 2913 * @conn_idx: cid
5d91e209 2914 */
7996a778 2915struct iscsi_cls_conn *
5d91e209
MC		 2916iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2917 uint32_t conn_idx)
7996a778 2918{
75613521 2919 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2920 struct iscsi_conn *conn;
2921 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2922 char *data;
7996a778 2923
5d91e209
MC		 2924 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2925 conn_idx);
7996a778
MC		 2926 if (!cls_conn)
2927 return NULL;
2928 conn = cls_conn->dd_data;
5d91e209 2929 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2930
5d91e209 2931 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2932 conn->session = session;
2933 conn->cls_conn = cls_conn;
2934 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2935 conn->id = conn_idx;
2936 conn->exp_statsn = 0;
843c0a8a 2937 conn->tmf_state = TMF_INITIAL;
f6d5180c 2938
2c4b9637 2939 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
f6d5180c 2940
843c0a8a 2941 INIT_LIST_HEAD(&conn->mgmtqueue);
3bbaaad9 2942 INIT_LIST_HEAD(&conn->cmdqueue);
843c0a8a 2943 INIT_LIST_HEAD(&conn->requeue);
6f8830f5 2944 spin_lock_init(&conn->taskqueuelock);
c4028958 2945 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2946
9c19a7d0 2947 /* allocate login_task used for the login/text sequences */
659743b0 2948 spin_lock_bh(&session->frwd_lock);
7acd72eb 2949 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 2950 (void*)&conn->login_task,
7996a778 2951 sizeof(void*))) {
659743b0 2952 spin_unlock_bh(&session->frwd_lock);
9c19a7d0 2953 goto login_task_alloc_fail;
7996a778 2954 }
659743b0 2955 spin_unlock_bh(&session->frwd_lock);
7996a778 2956
cfeb2cf9
MC		 2957 data = (char *) __get_free_pages(GFP_KERNEL,
2958 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
d36ab6f3 2959 if (!data)
9c19a7d0
MC		 2960 goto login_task_data_alloc_fail;
2961 conn->login_task->data = conn->data = data;
d36ab6f3 2962
2c4b9637 2963 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
7996a778
MC		 2964 init_waitqueue_head(&conn->ehwait);
2965
2966 return cls_conn;
2967
9c19a7d0 2968login_task_data_alloc_fail:
7acd72eb 2969 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2970 sizeof(void*));
9c19a7d0 2971login_task_alloc_fail:
7996a778
MC		 2972 iscsi_destroy_conn(cls_conn);
2973 return NULL;
2974}
2975EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2976
2977/**
2978 * iscsi_conn_teardown - teardown iscsi connection
ccd4a430 2979 * @cls_conn: iscsi class connection
7996a778
MC		 2980 *
2981 * TODO: we may need to make this into a two step process
2982 * like scsi-mls remove + put host
2983 */
2984void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2985{
2986 struct iscsi_conn *conn = cls_conn->dd_data;
2987 struct iscsi_session *session = conn->session;
7996a778 2988
f6d5180c
MC		 2989 del_timer_sync(&conn->transport_timer);
2990
660d0831 2991 mutex_lock(&session->eh_mutex);
659743b0 2992 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 2993 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2994 if (session->leadconn == conn) {
2995 /*
2996 * leading connection? then give up on recovery.
2997 */
2998 session->state = ISCSI_STATE_TERMINATE;
2999 wake_up(&conn->ehwait);
3000 }
659743b0 3001 spin_unlock_bh(&session->frwd_lock);
7996a778 3002
779ea120 3003 /* flush queued up work because we free the connection below */
843c0a8a 3004 iscsi_suspend_tx(conn);
779ea120 3005
659743b0 3006 spin_lock_bh(&session->frwd_lock);
cfeb2cf9
MC		 3007 free_pages((unsigned long) conn->data,
3008 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
f3ff0c36 3009 kfree(conn->persistent_address);
ae56ff40 3010 kfree(conn->local_ipaddr);
659743b0
SP		 3011 /* regular RX path uses back_lock */
3012 spin_lock_bh(&session->back_lock);
7acd72eb 3013 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
7996a778 3014 sizeof(void*));
659743b0 3015 spin_unlock_bh(&session->back_lock);
e0726407 3016 if (session->leadconn == conn)
7996a778 3017 session->leadconn = NULL;
659743b0 3018 spin_unlock_bh(&session->frwd_lock);
660d0831 3019 mutex_unlock(&session->eh_mutex);
7996a778 3020
7996a778
MC		 3021 iscsi_destroy_conn(cls_conn);
3022}
3023EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3024
3025int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3026{
3027 struct iscsi_conn *conn = cls_conn->dd_data;
3028 struct iscsi_session *session = conn->session;
3029
ffd0436e 3030 if (!session) {
322d739d
MC		 3031 iscsi_conn_printk(KERN_ERR, conn,
3032 "can't start unbound connection\n");
7996a778
MC		 3033 return -EPERM;
3034 }
3035
db98ccde
MC		 3036 if ((session->imm_data_en || !session->initial_r2t_en) &&
3037 session->first_burst > session->max_burst) {
322d739d
MC		 3038 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3039 "first_burst %d max_burst %d\n",
3040 session->first_burst, session->max_burst);
ffd0436e
MC		 3041 return -EINVAL;
3042 }
3043
f6d5180c 3044 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 3045 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3046 "zero. Using 5 seconds\n.");
f6d5180c
MC		 3047 conn->recv_timeout = 5;
3048 }
3049
3050 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 3051 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3052 "zero. Using 5 seconds.\n");
f6d5180c
MC		 3053 conn->ping_timeout = 5;
3054 }
3055
659743b0 3056 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 3057 conn->c_stage = ISCSI_CONN_STARTED;
3058 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 3059 session->queued_cmdsn = session->cmdsn;
7996a778 3060
f6d5180c
MC		 3061 conn->last_recv = jiffies;
3062 conn->last_ping = jiffies;
3063 if (conn->recv_timeout && conn->ping_timeout)
3064 mod_timer(&conn->transport_timer,
3065 jiffies + (conn->recv_timeout * HZ));
3066
7996a778
MC		 3067 switch(conn->stop_stage) {
3068 case STOP_CONN_RECOVER:
3069 /*
3070 * unblock eh_abort() if it is blocked. re-try all
3071 * commands after successful recovery
3072 */
7996a778 3073 conn->stop_stage = 0;
843c0a8a 3074 conn->tmf_state = TMF_INITIAL;
7996a778 3075 session->age++;
8b1d0343
MC		 3076 if (session->age == 16)
3077 session->age = 0;
6eabafbe 3078 break;
7996a778 3079 case STOP_CONN_TERM:
7996a778 3080 conn->stop_stage = 0;
7996a778
MC		 3081 break;
3082 default:
3083 break;
3084 }
659743b0 3085 spin_unlock_bh(&session->frwd_lock);
7996a778 3086
75613521 3087 iscsi_unblock_session(session->cls_session);
6eabafbe 3088 wake_up(&conn->ehwait);
7996a778
MC		 3089 return 0;
3090}
3091EXPORT_SYMBOL_GPL(iscsi_conn_start);
3092
3093static void
3bbaaad9 3094fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
7996a778 3095{
3bbaaad9 3096 struct iscsi_task *task;
b3cd5050 3097 int i, state;
7996a778 3098
3bbaaad9
MC		 3099 for (i = 0; i < conn->session->cmds_max; i++) {
3100 task = conn->session->cmds[i];
3101 if (task->sc)
3102 continue;
7996a778 3103
3bbaaad9
MC		 3104 if (task->state == ISCSI_TASK_FREE)
3105 continue;
7996a778 3106
3bbaaad9
MC		 3107 ISCSI_DBG_SESSION(conn->session,
3108 "failing mgmt itt 0x%x state %d\n",
3109 task->itt, task->state);
b3cd5050
MC		 3110 state = ISCSI_TASK_ABRT_SESS_RECOV;
3111 if (task->state == ISCSI_TASK_PENDING)
3112 state = ISCSI_TASK_COMPLETED;
3113 iscsi_complete_task(task, state);
3114
3bbaaad9 3115 }
7996a778
MC		 3116}
3117
656cffc9
MC		 3118static void iscsi_start_session_recovery(struct iscsi_session *session,
3119 struct iscsi_conn *conn, int flag)
7996a778 3120{
ed2abc7f
MC		 3121 int old_stop_stage;
3122
6724add1 3123 mutex_lock(&session->eh_mutex);
659743b0 3124 spin_lock_bh(&session->frwd_lock);
ed2abc7f 3125 if (conn->stop_stage == STOP_CONN_TERM) {
659743b0 3126 spin_unlock_bh(&session->frwd_lock);
6724add1
MC		 3127 mutex_unlock(&session->eh_mutex);
3128 return;
3129 }
3130
ed2abc7f
MC		 3131 /*
3132 * When this is called for the in_login state, we only want to clean
9c19a7d0 3133 * up the login task and connection. We do not need to block and set
67a61114 3134 * the recovery state again
ed2abc7f 3135 */
67a61114
MC		 3136 if (flag == STOP_CONN_TERM)
3137 session->state = ISCSI_STATE_TERMINATE;
3138 else if (conn->stop_stage != STOP_CONN_RECOVER)
3139 session->state = ISCSI_STATE_IN_RECOVERY;
4ae0a6c1
MC		 3140
3141 old_stop_stage = conn->stop_stage;
3142 conn->stop_stage = flag;
659743b0 3143 spin_unlock_bh(&session->frwd_lock);
ed2abc7f 3144
26013ad4
MC		 3145 del_timer_sync(&conn->transport_timer);
3146 iscsi_suspend_tx(conn);
3147
659743b0 3148 spin_lock_bh(&session->frwd_lock);
67a61114 3149 conn->c_stage = ISCSI_CONN_STOPPED;
659743b0 3150 spin_unlock_bh(&session->frwd_lock);
6724add1 3151
7996a778
MC		 3152 /*
3153 * for connection level recovery we should not calculate
3154 * header digest. conn->hdr_size used for optimization
3155 * in hdr_extract() and will be re-negotiated at
3156 * set_param() time.
3157 */
3158 if (flag == STOP_CONN_RECOVER) {
3159 conn->hdrdgst_en = 0;
3160 conn->datadgst_en = 0;
656cffc9 3161 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114 3162 old_stop_stage != STOP_CONN_RECOVER) {
1b2c7af8 3163 ISCSI_DBG_SESSION(session, "blocking session\n");
75613521 3164 iscsi_block_session(session->cls_session);
67a61114 3165 }
7996a778 3166 }
656cffc9 3167
656cffc9
MC		 3168 /*
3169 * flush queues.
3170 */
659743b0 3171 spin_lock_bh(&session->frwd_lock);
b3cd5050 3172 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3bbaaad9 3173 fail_mgmt_tasks(session, conn);
5d12c05e 3174 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
659743b0 3175 spin_unlock_bh(&session->frwd_lock);
6724add1 3176 mutex_unlock(&session->eh_mutex);
7996a778 3177}
7996a778
MC		 3178
3179void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3180{
3181 struct iscsi_conn *conn = cls_conn->dd_data;
3182 struct iscsi_session *session = conn->session;
3183
3184 switch (flag) {
3185 case STOP_CONN_RECOVER:
3186 case STOP_CONN_TERM:
3187 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 3188 break;
7996a778 3189 default:
322d739d
MC		 3190 iscsi_conn_printk(KERN_ERR, conn,
3191 "invalid stop flag %d\n", flag);
7996a778
MC		 3192 }
3193}
3194EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3195
3196int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3197 struct iscsi_cls_conn *cls_conn, int is_leading)
3198{
75613521 3199 struct iscsi_session *session = cls_session->dd_data;
98644047 3200 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 3201
659743b0 3202 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 3203 if (is_leading)
3204 session->leadconn = conn;
659743b0 3205 spin_unlock_bh(&session->frwd_lock);
7996a778
MC		 3206
3207 /*
3208 * Unblock xmitworker(), Login Phase will pass through.
3209 */
3210 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3211 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3212 return 0;
3213}
3214EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3215
adaf6990 3216int iscsi_switch_str_param(char **param, char *new_val_buf)
5700b1af
MC		 3217{
3218 char *new_val;
3219
3220 if (*param) {
3221 if (!strcmp(*param, new_val_buf))
3222 return 0;
3223 }
3224
3225 new_val = kstrdup(new_val_buf, GFP_NOIO);
3226 if (!new_val)
3227 return -ENOMEM;
3228
3229 kfree(*param);
3230 *param = new_val;
3231 return 0;
3232}
adaf6990 3233EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
a54a52ca
MC		 3234
3235int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3236 enum iscsi_param param, char *buf, int buflen)
3237{
3238 struct iscsi_conn *conn = cls_conn->dd_data;
3239 struct iscsi_session *session = conn->session;
6a06a4b8 3240 int val;
a54a52ca
MC		 3241
3242 switch(param) {
843c0a8a
MC		 3243 case ISCSI_PARAM_FAST_ABORT:
3244 sscanf(buf, "%d", &session->fast_abort);
3245 break;
f6d5180c
MC		 3246 case ISCSI_PARAM_ABORT_TMO:
3247 sscanf(buf, "%d", &session->abort_timeout);
3248 break;
3249 case ISCSI_PARAM_LU_RESET_TMO:
3250 sscanf(buf, "%d", &session->lu_reset_timeout);
3251 break;
3fe5ae8b
MC		 3252 case ISCSI_PARAM_TGT_RESET_TMO:
3253 sscanf(buf, "%d", &session->tgt_reset_timeout);
3254 break;
f6d5180c
MC		 3255 case ISCSI_PARAM_PING_TMO:
3256 sscanf(buf, "%d", &conn->ping_timeout);
3257 break;
3258 case ISCSI_PARAM_RECV_TMO:
3259 sscanf(buf, "%d", &conn->recv_timeout);
3260 break;
a54a52ca
MC		 3261 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3262 sscanf(buf, "%d", &conn->max_recv_dlength);
3263 break;
3264 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3265 sscanf(buf, "%d", &conn->max_xmit_dlength);
3266 break;
3267 case ISCSI_PARAM_HDRDGST_EN:
3268 sscanf(buf, "%d", &conn->hdrdgst_en);
3269 break;
3270 case ISCSI_PARAM_DATADGST_EN:
3271 sscanf(buf, "%d", &conn->datadgst_en);
3272 break;
3273 case ISCSI_PARAM_INITIAL_R2T_EN:
3274 sscanf(buf, "%d", &session->initial_r2t_en);
3275 break;
3276 case ISCSI_PARAM_MAX_R2T:
1304be5f 3277 sscanf(buf, "%hu", &session->max_r2t);
a54a52ca
MC		 3278 break;
3279 case ISCSI_PARAM_IMM_DATA_EN:
3280 sscanf(buf, "%d", &session->imm_data_en);
3281 break;
3282 case ISCSI_PARAM_FIRST_BURST:
3283 sscanf(buf, "%d", &session->first_burst);
3284 break;
3285 case ISCSI_PARAM_MAX_BURST:
3286 sscanf(buf, "%d", &session->max_burst);
3287 break;
3288 case ISCSI_PARAM_PDU_INORDER_EN:
3289 sscanf(buf, "%d", &session->pdu_inorder_en);
3290 break;
3291 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3292 sscanf(buf, "%d", &session->dataseq_inorder_en);
3293 break;
3294 case ISCSI_PARAM_ERL:
3295 sscanf(buf, "%d", &session->erl);
3296 break;
a54a52ca
MC		 3297 case ISCSI_PARAM_EXP_STATSN:
3298 sscanf(buf, "%u", &conn->exp_statsn);
3299 break;
b2c64167 3300 case ISCSI_PARAM_USERNAME:
5700b1af 3301 return iscsi_switch_str_param(&session->username, buf);
b2c64167 3302 case ISCSI_PARAM_USERNAME_IN:
5700b1af 3303 return iscsi_switch_str_param(&session->username_in, buf);
b2c64167 3304 case ISCSI_PARAM_PASSWORD:
5700b1af 3305 return iscsi_switch_str_param(&session->password, buf);
b2c64167 3306 case ISCSI_PARAM_PASSWORD_IN:
5700b1af 3307 return iscsi_switch_str_param(&session->password_in, buf);
a54a52ca 3308 case ISCSI_PARAM_TARGET_NAME:
5700b1af 3309 return iscsi_switch_str_param(&session->targetname, buf);
3c5c4801
VC		 3310 case ISCSI_PARAM_TARGET_ALIAS:
3311 return iscsi_switch_str_param(&session->targetalias, buf);
a54a52ca
MC		 3312 case ISCSI_PARAM_TPGT:
3313 sscanf(buf, "%d", &session->tpgt);
3314 break;
3315 case ISCSI_PARAM_PERSISTENT_PORT:
3316 sscanf(buf, "%d", &conn->persistent_port);
3317 break;
3318 case ISCSI_PARAM_PERSISTENT_ADDRESS:
5700b1af 3319 return iscsi_switch_str_param(&conn->persistent_address, buf);
88dfd340 3320 case ISCSI_PARAM_IFACE_NAME:
5700b1af 3321 return iscsi_switch_str_param(&session->ifacename, buf);
88dfd340 3322 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3323 return iscsi_switch_str_param(&session->initiatorname, buf);
3b9373e9
EW		 3324 case ISCSI_PARAM_BOOT_ROOT:
3325 return iscsi_switch_str_param(&session->boot_root, buf);
3326 case ISCSI_PARAM_BOOT_NIC:
3327 return iscsi_switch_str_param(&session->boot_nic, buf);
3328 case ISCSI_PARAM_BOOT_TARGET:
3329 return iscsi_switch_str_param(&session->boot_target, buf);
f8525eb4
AC		 3330 case ISCSI_PARAM_PORTAL_TYPE:
3331 return iscsi_switch_str_param(&session->portal_type, buf);
3332 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3333 return iscsi_switch_str_param(&session->discovery_parent_type,
3334 buf);
6a06a4b8
OG		 3335 case ISCSI_PARAM_DISCOVERY_SESS:
3336 sscanf(buf, "%d", &val);
3337 session->discovery_sess = !!val;
3338 break;
ae56ff40
AC		 3339 case ISCSI_PARAM_LOCAL_IPADDR:
3340 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
a54a52ca
MC		 3341 default:
3342 return -ENOSYS;
3343 }
3344
3345 return 0;
3346}
3347EXPORT_SYMBOL_GPL(iscsi_set_param);
3348
3349int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3350 enum iscsi_param param, char *buf)
3351{
75613521 3352 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 3353 int len;
3354
3355 switch(param) {
843c0a8a
MC		 3356 case ISCSI_PARAM_FAST_ABORT:
3357 len = sprintf(buf, "%d\n", session->fast_abort);
3358 break;
f6d5180c
MC		 3359 case ISCSI_PARAM_ABORT_TMO:
3360 len = sprintf(buf, "%d\n", session->abort_timeout);
3361 break;
3362 case ISCSI_PARAM_LU_RESET_TMO:
3363 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3364 break;
3fe5ae8b
MC		 3365 case ISCSI_PARAM_TGT_RESET_TMO:
3366 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3367 break;
a54a52ca
MC		 3368 case ISCSI_PARAM_INITIAL_R2T_EN:
3369 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3370 break;
3371 case ISCSI_PARAM_MAX_R2T:
3372 len = sprintf(buf, "%hu\n", session->max_r2t);
3373 break;
3374 case ISCSI_PARAM_IMM_DATA_EN:
3375 len = sprintf(buf, "%d\n", session->imm_data_en);
3376 break;
3377 case ISCSI_PARAM_FIRST_BURST:
3378 len = sprintf(buf, "%u\n", session->first_burst);
3379 break;
3380 case ISCSI_PARAM_MAX_BURST:
3381 len = sprintf(buf, "%u\n", session->max_burst);
3382 break;
3383 case ISCSI_PARAM_PDU_INORDER_EN:
3384 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3385 break;
3386 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3387 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3388 break;
5f09e1f3
AC		 3389 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3390 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo);
3391 break;
a54a52ca
MC		 3392 case ISCSI_PARAM_ERL:
3393 len = sprintf(buf, "%d\n", session->erl);
3394 break;
3395 case ISCSI_PARAM_TARGET_NAME:
3396 len = sprintf(buf, "%s\n", session->targetname);
3397 break;
3c5c4801
VC		 3398 case ISCSI_PARAM_TARGET_ALIAS:
3399 len = sprintf(buf, "%s\n", session->targetalias);
3400 break;
a54a52ca
MC		 3401 case ISCSI_PARAM_TPGT:
3402 len = sprintf(buf, "%d\n", session->tpgt);
3403 break;
b2c64167
MC		 3404 case ISCSI_PARAM_USERNAME:
3405 len = sprintf(buf, "%s\n", session->username);
3406 break;
3407 case ISCSI_PARAM_USERNAME_IN:
3408 len = sprintf(buf, "%s\n", session->username_in);
3409 break;
3410 case ISCSI_PARAM_PASSWORD:
3411 len = sprintf(buf, "%s\n", session->password);
3412 break;
3413 case ISCSI_PARAM_PASSWORD_IN:
3414 len = sprintf(buf, "%s\n", session->password_in);
3415 break;
88dfd340
MC		 3416 case ISCSI_PARAM_IFACE_NAME:
3417 len = sprintf(buf, "%s\n", session->ifacename);
3418 break;
3419 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3420 len = sprintf(buf, "%s\n", session->initiatorname);
88dfd340 3421 break;
3b9373e9
EW		 3422 case ISCSI_PARAM_BOOT_ROOT:
3423 len = sprintf(buf, "%s\n", session->boot_root);
3424 break;
3425 case ISCSI_PARAM_BOOT_NIC:
3426 len = sprintf(buf, "%s\n", session->boot_nic);
3427 break;
3428 case ISCSI_PARAM_BOOT_TARGET:
3429 len = sprintf(buf, "%s\n", session->boot_target);
9a2307b1 3430 break;
f8525eb4
AC		 3431 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3432 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable);
3433 break;
3434 case ISCSI_PARAM_DISCOVERY_SESS:
3435 len = sprintf(buf, "%u\n", session->discovery_sess);
3436 break;
3437 case ISCSI_PARAM_PORTAL_TYPE:
3438 len = sprintf(buf, "%s\n", session->portal_type);
3439 break;
3440 case ISCSI_PARAM_CHAP_AUTH_EN:
3441 len = sprintf(buf, "%u\n", session->chap_auth_en);
3442 break;
3443 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3444 len = sprintf(buf, "%u\n", session->discovery_logout_en);
3445 break;
3446 case ISCSI_PARAM_BIDI_CHAP_EN:
3447 len = sprintf(buf, "%u\n", session->bidi_chap_en);
3448 break;
3449 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3450 len = sprintf(buf, "%u\n", session->discovery_auth_optional);
3451 break;
3452 case ISCSI_PARAM_DEF_TIME2WAIT:
3453 len = sprintf(buf, "%d\n", session->time2wait);
3454 break;
3455 case ISCSI_PARAM_DEF_TIME2RETAIN:
3456 len = sprintf(buf, "%d\n", session->time2retain);
3457 break;
3458 case ISCSI_PARAM_TSID:
3459 len = sprintf(buf, "%u\n", session->tsid);
3460 break;
3461 case ISCSI_PARAM_ISID:
3462 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n",
3463 session->isid[0], session->isid[1],
3464 session->isid[2], session->isid[3],
3465 session->isid[4], session->isid[5]);
3466 break;
3467 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3468 len = sprintf(buf, "%u\n", session->discovery_parent_idx);
3469 break;
3470 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3471 if (session->discovery_parent_type)
3472 len = sprintf(buf, "%s\n",
3473 session->discovery_parent_type);
3474 else
3475 len = sprintf(buf, "\n");
3b9373e9 3476 break;
a54a52ca
MC		 3477 default:
3478 return -ENOSYS;
3479 }
3480
3481 return len;
3482}
3483EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3484
00f3708e
MC		 3485int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3486 enum iscsi_param param, char *buf)
3487{
3488 struct sockaddr_in6 *sin6 = NULL;
3489 struct sockaddr_in *sin = NULL;
3490 int len;
3491
3492 switch (addr->ss_family) {
3493 case AF_INET:
3494 sin = (struct sockaddr_in *)addr;
3495 break;
3496 case AF_INET6:
3497 sin6 = (struct sockaddr_in6 *)addr;
3498 break;
3499 default:
3500 return -EINVAL;
3501 }
3502
3503 switch (param) {
3504 case ISCSI_PARAM_CONN_ADDRESS:
3505 case ISCSI_HOST_PARAM_IPADDRESS:
3506 if (sin)
3507 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3508 else
3509 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3510 break;
3511 case ISCSI_PARAM_CONN_PORT:
4bfb8ebf 3512 case ISCSI_PARAM_LOCAL_PORT:
00f3708e
MC		 3513 if (sin)
3514 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3515 else
3516 len = sprintf(buf, "%hu\n",
3517 be16_to_cpu(sin6->sin6_port));
3518 break;
3519 default:
3520 return -EINVAL;
3521 }
3522
3523 return len;
3524}
3525EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3526
a54a52ca
MC		 3527int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3528 enum iscsi_param param, char *buf)
3529{
3530 struct iscsi_conn *conn = cls_conn->dd_data;
3531 int len;
3532
3533 switch(param) {
f6d5180c
MC		 3534 case ISCSI_PARAM_PING_TMO:
3535 len = sprintf(buf, "%u\n", conn->ping_timeout);
3536 break;
3537 case ISCSI_PARAM_RECV_TMO:
3538 len = sprintf(buf, "%u\n", conn->recv_timeout);
3539 break;
a54a52ca
MC		 3540 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3541 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3542 break;
3543 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3544 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3545 break;
3546 case ISCSI_PARAM_HDRDGST_EN:
3547 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3548 break;
3549 case ISCSI_PARAM_DATADGST_EN:
3550 len = sprintf(buf, "%d\n", conn->datadgst_en);
3551 break;
3552 case ISCSI_PARAM_IFMARKER_EN:
3553 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3554 break;
3555 case ISCSI_PARAM_OFMARKER_EN:
3556 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3557 break;
3558 case ISCSI_PARAM_EXP_STATSN:
3559 len = sprintf(buf, "%u\n", conn->exp_statsn);
3560 break;
3561 case ISCSI_PARAM_PERSISTENT_PORT:
3562 len = sprintf(buf, "%d\n", conn->persistent_port);
3563 break;
3564 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3565 len = sprintf(buf, "%s\n", conn->persistent_address);
3566 break;
f8525eb4
AC		 3567 case ISCSI_PARAM_STATSN:
3568 len = sprintf(buf, "%u\n", conn->statsn);
3569 break;
3570 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3571 len = sprintf(buf, "%u\n", conn->max_segment_size);
3572 break;
3573 case ISCSI_PARAM_KEEPALIVE_TMO:
3574 len = sprintf(buf, "%u\n", conn->keepalive_tmo);
3575 break;
3576 case ISCSI_PARAM_LOCAL_PORT:
3577 len = sprintf(buf, "%u\n", conn->local_port);
3578 break;
3579 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3580 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat);
3581 break;
3582 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3583 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable);
3584 break;
3585 case ISCSI_PARAM_TCP_WSF_DISABLE:
3586 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable);
3587 break;
3588 case ISCSI_PARAM_TCP_TIMER_SCALE:
3589 len = sprintf(buf, "%u\n", conn->tcp_timer_scale);
3590 break;
3591 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3592 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en);
3593 break;
3594 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3595 len = sprintf(buf, "%u\n", conn->fragment_disable);
3596 break;
3597 case ISCSI_PARAM_IPV4_TOS:
3598 len = sprintf(buf, "%u\n", conn->ipv4_tos);
3599 break;
3600 case ISCSI_PARAM_IPV6_TC:
3601 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class);
3602 break;
5f09e1f3
AC		 3603 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3604 len = sprintf(buf, "%u\n", conn->ipv6_flow_label);
3605 break;
f8525eb4
AC		 3606 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3607 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6);
3608 break;
3609 case ISCSI_PARAM_TCP_XMIT_WSF:
3610 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf);
3611 break;
3612 case ISCSI_PARAM_TCP_RECV_WSF:
3613 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf);
3614 break;
ae56ff40
AC		 3615 case ISCSI_PARAM_LOCAL_IPADDR:
3616 len = sprintf(buf, "%s\n", conn->local_ipaddr);
3617 break;
a54a52ca
MC		 3618 default:
3619 return -ENOSYS;
3620 }
3621
3622 return len;
3623}
3624EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3625
0801c242
MC		 3626int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3627 char *buf)
3628{
75613521 3629 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3630 int len;
3631
3632 switch (param) {
d8196ed2 3633 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3634 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 3635 break;
0801c242 3636 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3637 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 3638 break;
8ad5781a 3639 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3640 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 3641 break;
0801c242
MC		 3642 default:
3643 return -ENOSYS;
3644 }
3645
3646 return len;
3647}
3648EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3649
3650int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3651 char *buf, int buflen)
3652{
75613521 3653 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3654
3655 switch (param) {
d8196ed2 3656 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3657 return iscsi_switch_str_param(&ihost->netdev, buf);
0801c242 3658 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3659 return iscsi_switch_str_param(&ihost->hwaddress, buf);
8ad5781a 3660 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3661 return iscsi_switch_str_param(&ihost->initiatorname, buf);
0801c242
MC		 3662 default:
3663 return -ENOSYS;
3664 }
3665
3666 return 0;
3667}
3668EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3669
7996a778
MC		 3670MODULE_AUTHOR("Mike Christie");
3671MODULE_DESCRIPTION("iSCSI library functions");
3672MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)