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[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>
8eb00539 29#include <asm/unaligned.h>
7996a778
MC		 30#include <net/tcp.h>
31#include <scsi/scsi_cmnd.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_eh.h>
34#include <scsi/scsi_tcq.h>
35#include <scsi/scsi_host.h>
36#include <scsi/scsi.h>
37#include <scsi/iscsi_proto.h>
38#include <scsi/scsi_transport.h>
39#include <scsi/scsi_transport_iscsi.h>
40#include <scsi/libiscsi.h>
41
bd2199d4
EZ		 42static int iscsi_dbg_lib_conn;
43module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
44 S_IRUGO | S_IWUSR);
45MODULE_PARM_DESC(debug_libiscsi_conn,
46 "Turn on debugging for connections in libiscsi module. "
47 "Set to 1 to turn on, and zero to turn off. Default is off.");
48
49static int iscsi_dbg_lib_session;
50module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
51 S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug_libiscsi_session,
53 "Turn on debugging for sessions in libiscsi module. "
54 "Set to 1 to turn on, and zero to turn off. Default is off.");
55
56static int iscsi_dbg_lib_eh;
57module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
58 S_IRUGO | S_IWUSR);
59MODULE_PARM_DESC(debug_libiscsi_eh,
60 "Turn on debugging for error handling in libiscsi module. "
61 "Set to 1 to turn on, and zero to turn off. Default is off.");
1b2c7af8
MC		 62
63#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
64 do { \
bd2199d4 65 if (iscsi_dbg_lib_conn) \
1b2c7af8
MC		 66 iscsi_conn_printk(KERN_INFO, _conn, \
67 "%s " dbg_fmt, \
68 __func__, ##arg); \
69 } while (0);
70
71#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
72 do { \
bd2199d4
EZ		 73 if (iscsi_dbg_lib_session) \
74 iscsi_session_printk(KERN_INFO, _session, \
75 "%s " dbg_fmt, \
76 __func__, ##arg); \
77 } while (0);
78
79#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
80 do { \
81 if (iscsi_dbg_lib_eh) \
1b2c7af8
MC		 82 iscsi_session_printk(KERN_INFO, _session, \
83 "%s " dbg_fmt, \
84 __func__, ##arg); \
85 } while (0);
86
32ae763e
MC		 87inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
88{
89 struct Scsi_Host *shost = conn->session->host;
90 struct iscsi_host *ihost = shost_priv(shost);
91
1336aed1
MC		 92 if (ihost->workq)
93 queue_work(ihost->workq, &conn->xmitwork);
32ae763e
MC		 94}
95EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
96
4c0ba5d2
MC		 97static void __iscsi_update_cmdsn(struct iscsi_session *session,
98 uint32_t exp_cmdsn, uint32_t max_cmdsn)
7996a778 99{
77a23c21
MC		 100 /*
101 * standard specifies this check for when to update expected and
102 * max sequence numbers
103 */
104 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
105 return;
106
107 if (exp_cmdsn != session->exp_cmdsn &&
108 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 109 session->exp_cmdsn = exp_cmdsn;
110
77a23c21
MC		 111 if (max_cmdsn != session->max_cmdsn &&
112 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
113 session->max_cmdsn = max_cmdsn;
114 /*
115 * if the window closed with IO queued, then kick the
116 * xmit thread
117 */
3bbaaad9 118 if (!list_empty(&session->leadconn->cmdqueue) ||
1336aed1
MC		 119 !list_empty(&session->leadconn->mgmtqueue))
120 iscsi_conn_queue_work(session->leadconn);
77a23c21 121 }
7996a778 122}
4c0ba5d2
MC		 123
124void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
125{
126 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
127 be32_to_cpu(hdr->max_cmdsn));
128}
77a23c21 129EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 130
577577da
MC		 131/**
132 * iscsi_prep_data_out_pdu - initialize Data-Out
133 * @task: scsi command task
134 * @r2t: R2T info
135 * @hdr: iscsi data in pdu
136 *
137 * Notes:
138 * Initialize Data-Out within this R2T sequence and finds
139 * proper data_offset within this SCSI command.
140 *
141 * This function is called with connection lock taken.
142 **/
143void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
144 struct iscsi_data *hdr)
7996a778 145{
9c19a7d0 146 struct iscsi_conn *conn = task->conn;
577577da
MC		 147 unsigned int left = r2t->data_length - r2t->sent;
148
149 task->hdr_len = sizeof(struct iscsi_data);
7996a778
MC		 150
151 memset(hdr, 0, sizeof(struct iscsi_data));
577577da
MC		 152 hdr->ttt = r2t->ttt;
153 hdr->datasn = cpu_to_be32(r2t->datasn);
154 r2t->datasn++;
7996a778 155 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
55bdabdf 156 hdr->lun = task->lun;
577577da
MC		 157 hdr->itt = task->hdr_itt;
158 hdr->exp_statsn = r2t->exp_statsn;
159 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
160 if (left > conn->max_xmit_dlength) {
7996a778 161 hton24(hdr->dlength, conn->max_xmit_dlength);
577577da 162 r2t->data_count = conn->max_xmit_dlength;
7996a778
MC		 163 hdr->flags = 0;
164 } else {
577577da
MC		 165 hton24(hdr->dlength, left);
166 r2t->data_count = left;
7996a778
MC		 167 hdr->flags = ISCSI_FLAG_CMD_FINAL;
168 }
577577da 169 conn->dataout_pdus_cnt++;
7996a778 170}
577577da 171EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
7996a778 172
9c19a7d0 173static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 174{
9c19a7d0 175 unsigned exp_len = task->hdr_len + len;
004d6530 176
9c19a7d0 177 if (exp_len > task->hdr_max) {
004d6530
BH		 178 WARN_ON(1);
179 return -EINVAL;
180 }
181
182 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 183 task->hdr_len = exp_len;
004d6530
BH		 184 return 0;
185}
186
38d1c069
BH		 187/*
188 * make an extended cdb AHS
189 */
9c19a7d0 190static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 191{
9c19a7d0 192 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 193 unsigned rlen, pad_len;
194 unsigned short ahslength;
195 struct iscsi_ecdb_ahdr *ecdb_ahdr;
196 int rc;
197
9c19a7d0 198 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 199 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
200
201 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
202 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
203
204 pad_len = iscsi_padding(rlen);
205
9c19a7d0 206 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 207 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
208 if (rc)
209 return rc;
210
211 if (pad_len)
212 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
213
214 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
215 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
216 ecdb_ahdr->reserved = 0;
217 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
218
1b2c7af8
MC		 219 ISCSI_DBG_SESSION(task->conn->session,
220 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
221 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
222 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
223 task->hdr_len);
38d1c069
BH		 224 return 0;
225}
226
9c19a7d0 227static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
c07d4444 228{
9c19a7d0 229 struct scsi_cmnd *sc = task->sc;
c07d4444
BH		 230 struct iscsi_rlength_ahdr *rlen_ahdr;
231 int rc;
232
9c19a7d0
MC		 233 rlen_ahdr = iscsi_next_hdr(task);
234 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
c07d4444
BH		 235 if (rc)
236 return rc;
237
238 rlen_ahdr->ahslength =
239 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
240 sizeof(rlen_ahdr->reserved));
241 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
242 rlen_ahdr->reserved = 0;
243 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
244
1b2c7af8
MC		 245 ISCSI_DBG_SESSION(task->conn->session,
246 "bidi-in rlen_ahdr->read_length(%d) "
247 "rlen_ahdr->ahslength(%d)\n",
248 be32_to_cpu(rlen_ahdr->read_length),
249 be16_to_cpu(rlen_ahdr->ahslength));
c07d4444
BH		 250 return 0;
251}
252
5d12c05e
MC		 253/**
254 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
255 * @task: iscsi task
256 * @opcode: opcode to check for
257 *
258 * During TMF a task has to be checked if it's affected.
259 * All unrelated I/O can be passed through, but I/O to the
260 * affected LUN should be restricted.
261 * If 'fast_abort' is set we won't be sending any I/O to the
262 * affected LUN.
263 * Otherwise the target is waiting for all TTTs to be completed,
264 * so we have to send all outstanding Data-Out PDUs to the target.
265 */
266static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
267{
268 struct iscsi_conn *conn = task->conn;
269 struct iscsi_tm *tmf = &conn->tmhdr;
270 unsigned int hdr_lun;
271
272 if (conn->tmf_state == TMF_INITIAL)
273 return 0;
274
275 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
276 return 0;
277
278 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
279 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
280 /*
281 * Allow PDUs for unrelated LUNs
282 */
55bdabdf 283 hdr_lun = scsilun_to_int(&tmf->lun);
5d12c05e
MC		 284 if (hdr_lun != task->sc->device->lun)
285 return 0;
3fe5ae8b
MC		 286 /* fall through */
287 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
5d12c05e
MC		 288 /*
289 * Fail all SCSI cmd PDUs
290 */
291 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
292 iscsi_conn_printk(KERN_INFO, conn,
293 "task [op %x/%x itt "
3fe5ae8b 294 "0x%x/0x%x] "
5d12c05e
MC		 295 "rejected.\n",
296 task->hdr->opcode, opcode,
3fe5ae8b 297 task->itt, task->hdr_itt);
5d12c05e
MC		 298 return -EACCES;
299 }
300 /*
301 * And also all data-out PDUs in response to R2T
302 * if fast_abort is set.
303 */
304 if (conn->session->fast_abort) {
305 iscsi_conn_printk(KERN_INFO, conn,
306 "task [op %x/%x itt "
3fe5ae8b 307 "0x%x/0x%x] fast abort.\n",
5d12c05e 308 task->hdr->opcode, opcode,
3fe5ae8b 309 task->itt, task->hdr_itt);
5d12c05e
MC		 310 return -EACCES;
311 }
312 break;
313 case ISCSI_TM_FUNC_ABORT_TASK:
314 /*
315 * the caller has already checked if the task
316 * they want to abort was in the pending queue so if
317 * we are here the cmd pdu has gone out already, and
318 * we will only hit this for data-outs
319 */
320 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
321 task->hdr_itt == tmf->rtt) {
322 ISCSI_DBG_SESSION(conn->session,
323 "Preventing task %x/%x from sending "
324 "data-out due to abort task in "
325 "progress\n", task->itt,
326 task->hdr_itt);
327 return -EACCES;
328 }
329 break;
330 }
331
332 return 0;
333}
334
7996a778
MC		 335/**
336 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 337 * @task: iscsi task
7996a778
MC		 338 *
339 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
340 * fields like dlength or final based on how much data it sends
341 */
9c19a7d0 342static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 343{
9c19a7d0 344 struct iscsi_conn *conn = task->conn;
7996a778 345 struct iscsi_session *session = conn->session;
9c19a7d0 346 struct scsi_cmnd *sc = task->sc;
12352183 347 struct iscsi_scsi_req *hdr;
38d1c069 348 unsigned hdrlength, cmd_len;
262ef636 349 itt_t itt;
004d6530 350 int rc;
7996a778 351
5d12c05e
MC		 352 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
353 if (rc)
354 return rc;
355
184b57c6
MC		 356 if (conn->session->tt->alloc_pdu) {
357 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
358 if (rc)
359 return rc;
360 }
12352183 361 hdr = (struct iscsi_scsi_req *)task->hdr;
262ef636 362 itt = hdr->itt;
577577da
MC		 363 memset(hdr, 0, sizeof(*hdr));
364
2ff79d52
MC		 365 if (session->tt->parse_pdu_itt)
366 hdr->itt = task->hdr_itt = itt;
367 else
368 hdr->itt = task->hdr_itt = build_itt(task->itt,
369 task->conn->session->age);
9c19a7d0
MC		 370 task->hdr_len = 0;
371 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 372 if (rc)
373 return rc;
a8ac6311
OK		 374 hdr->opcode = ISCSI_OP_SCSI_CMD;
375 hdr->flags = ISCSI_ATTR_SIMPLE;
55bdabdf
AG		 376 int_to_scsilun(sc->device->lun, &hdr->lun);
377 task->lun = hdr->lun;
a8ac6311 378 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 379 cmd_len = sc->cmd_len;
380 if (cmd_len < ISCSI_CDB_SIZE)
381 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
382 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 383 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 384 if (rc)
385 return rc;
386 cmd_len = ISCSI_CDB_SIZE;
387 }
388 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 389
9c19a7d0 390 task->imm_count = 0;
c07d4444
BH		 391 if (scsi_bidi_cmnd(sc)) {
392 hdr->flags |= ISCSI_FLAG_CMD_READ;
9c19a7d0 393 rc = iscsi_prep_bidi_ahs(task);
c07d4444
BH		 394 if (rc)
395 return rc;
396 }
7996a778 397 if (sc->sc_data_direction == DMA_TO_DEVICE) {
c07d4444 398 unsigned out_len = scsi_out(sc)->length;
577577da
MC		 399 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
400
c07d4444 401 hdr->data_length = cpu_to_be32(out_len);
7996a778
MC		 402 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
403 /*
404 * Write counters:
405 *
406 * imm_count bytes to be sent right after
407 * SCSI PDU Header
408 *
409 * unsol_count bytes(as Data-Out) to be sent
410 * without R2T ack right after
411 * immediate data
412 *
577577da 413 * r2t data_length bytes to be sent via R2T ack's
7996a778
MC		 414 *
415 * pad_count bytes to be sent as zero-padding
416 */
577577da 417 memset(r2t, 0, sizeof(*r2t));
7996a778
MC		 418
419 if (session->imm_data_en) {
c07d4444 420 if (out_len >= session->first_burst)
9c19a7d0 421 task->imm_count = min(session->first_burst,
7996a778
MC		 422 conn->max_xmit_dlength);
423 else
9c19a7d0 424 task->imm_count = min(out_len,
7996a778 425 conn->max_xmit_dlength);
9c19a7d0 426 hton24(hdr->dlength, task->imm_count);
7996a778 427 } else
a8ac6311 428 zero_data(hdr->dlength);
7996a778 429
ffd0436e 430 if (!session->initial_r2t_en) {
577577da
MC		 431 r2t->data_length = min(session->first_burst, out_len) -
432 task->imm_count;
433 r2t->data_offset = task->imm_count;
434 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
435 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e
MC		 436 }
437
577577da 438 if (!task->unsol_r2t.data_length)
7996a778 439 /* No unsolicit Data-Out's */
a8ac6311 440 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 441 } else {
7996a778
MC		 442 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
443 zero_data(hdr->dlength);
c07d4444 444 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
7996a778
MC		 445
446 if (sc->sc_data_direction == DMA_FROM_DEVICE)
447 hdr->flags |= ISCSI_FLAG_CMD_READ;
448 }
449
004d6530 450 /* calculate size of additional header segments (AHSs) */
9c19a7d0 451 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 452
453 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
454 hdrlength /= ISCSI_PAD_LEN;
455
456 WARN_ON(hdrlength >= 256);
457 hdr->hlength = hdrlength & 0xFF;
96b1f96d 458 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
004d6530 459
577577da 460 if (session->tt->init_task && session->tt->init_task(task))
052d0144
MC		 461 return -EIO;
462
9c19a7d0 463 task->state = ISCSI_TASK_RUNNING;
d3305f34 464 session->cmdsn++;
77a23c21 465
a8ac6311 466 conn->scsicmd_pdus_cnt++;
1b2c7af8
MC		 467 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
468 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
469 scsi_bidi_cmnd(sc) ? "bidirectional" :
470 sc->sc_data_direction == DMA_TO_DEVICE ?
471 "write" : "read", conn->id, sc, sc->cmnd[0],
472 task->itt, scsi_bufflen(sc),
473 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
474 session->cmdsn,
475 session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 476 return 0;
7996a778 477}
7996a778
MC		 478
479/**
3bbaaad9 480 * iscsi_free_task - free a task
9c19a7d0 481 * @task: iscsi cmd task
7996a778
MC		 482 *
483 * Must be called with session lock.
3e5c28ad
MC		 484 * This function returns the scsi command to scsi-ml or cleans
485 * up mgmt tasks then returns the task to the pool.
7996a778 486 */
3bbaaad9 487static void iscsi_free_task(struct iscsi_task *task)
7996a778 488{
9c19a7d0 489 struct iscsi_conn *conn = task->conn;
c1635cb7 490 struct iscsi_session *session = conn->session;
9c19a7d0 491 struct scsi_cmnd *sc = task->sc;
f41d4721 492 int oldstate = task->state;
7996a778 493
4421c9eb
MC		 494 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
495 task->itt, task->state, task->sc);
496
577577da 497 session->tt->cleanup_task(task);
3bbaaad9 498 task->state = ISCSI_TASK_FREE;
9c19a7d0 499 task->sc = NULL;
3e5c28ad 500 /*
9c19a7d0 501 * login task is preallocated so do not free
3e5c28ad 502 */
9c19a7d0 503 if (conn->login_task == task)
3e5c28ad
MC		 504 return;
505
7acd72eb 506 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 507
3e5c28ad 508 if (sc) {
9c19a7d0 509 task->sc = NULL;
3e5c28ad
MC		 510 /* SCSI eh reuses commands to verify us */
511 sc->SCp.ptr = NULL;
512 /*
f41d4721
MC		 513 * queue command may call this to free the task, so
514 * it will decide how to return sc to scsi-ml.
3e5c28ad 515 */
f41d4721 516 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
3e5c28ad
MC		 517 sc->scsi_done(sc);
518 }
7996a778
MC		 519}
520
913e5bf4 521void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 522{
9c19a7d0 523 atomic_inc(&task->refcount);
60ecebf5 524}
913e5bf4 525EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 526
8eea2f55 527void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 528{
9c19a7d0 529 if (atomic_dec_and_test(&task->refcount))
3bbaaad9 530 iscsi_free_task(task);
60ecebf5 531}
8eea2f55 532EXPORT_SYMBOL_GPL(__iscsi_put_task);
60ecebf5 533
9c19a7d0 534void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 535{
9c19a7d0 536 struct iscsi_session *session = task->conn->session;
3e5c28ad
MC		 537
538 spin_lock_bh(&session->lock);
9c19a7d0 539 __iscsi_put_task(task);
3e5c28ad
MC		 540 spin_unlock_bh(&session->lock);
541}
9c19a7d0 542EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 543
3bbaaad9
MC		 544/**
545 * iscsi_complete_task - finish a task
546 * @task: iscsi cmd task
b3cd5050 547 * @state: state to complete task with
3bbaaad9
MC		 548 *
549 * Must be called with session lock.
550 */
b3cd5050 551static void iscsi_complete_task(struct iscsi_task *task, int state)
3bbaaad9
MC		 552{
553 struct iscsi_conn *conn = task->conn;
554
4421c9eb
MC		 555 ISCSI_DBG_SESSION(conn->session,
556 "complete task itt 0x%x state %d sc %p\n",
557 task->itt, task->state, task->sc);
b3cd5050
MC		 558 if (task->state == ISCSI_TASK_COMPLETED ||
559 task->state == ISCSI_TASK_ABRT_TMF ||
f41d4721
MC		 560 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
561 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
3bbaaad9
MC		 562 return;
563 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
b3cd5050 564 task->state = state;
3bbaaad9
MC		 565
566 if (!list_empty(&task->running))
567 list_del_init(&task->running);
568
569 if (conn->task == task)
570 conn->task = NULL;
571
572 if (conn->ping_task == task)
573 conn->ping_task = NULL;
574
575 /* release get from queueing */
576 __iscsi_put_task(task);
577}
578
4c0ba5d2
MC		 579/**
580 * iscsi_complete_scsi_task - finish scsi task normally
581 * @task: iscsi task for scsi cmd
582 * @exp_cmdsn: expected cmd sn in cpu format
583 * @max_cmdsn: max cmd sn in cpu format
584 *
585 * This is used when drivers do not need or cannot perform
586 * lower level pdu processing.
587 *
588 * Called with session lock
589 */
590void iscsi_complete_scsi_task(struct iscsi_task *task,
591 uint32_t exp_cmdsn, uint32_t max_cmdsn)
592{
593 struct iscsi_conn *conn = task->conn;
594
595 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
596
597 conn->last_recv = jiffies;
598 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
599 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
600}
601EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
602
603
b3a7ea8d 604/*
3bbaaad9
MC		 605 * session lock must be held and if not called for a task that is
606 * still pending or from the xmit thread, then xmit thread must
607 * be suspended.
b3a7ea8d 608 */
3bbaaad9 609static void fail_scsi_task(struct iscsi_task *task, int err)
b3a7ea8d 610{
3bbaaad9 611 struct iscsi_conn *conn = task->conn;
b3a7ea8d 612 struct scsi_cmnd *sc;
b3cd5050 613 int state;
b3a7ea8d 614
3bbaaad9
MC		 615 /*
616 * if a command completes and we get a successful tmf response
617 * we will hit this because the scsi eh abort code does not take
618 * a ref to the task.
619 */
9c19a7d0 620 sc = task->sc;
b3a7ea8d
MC		 621 if (!sc)
622 return;
623
b3cd5050 624 if (task->state == ISCSI_TASK_PENDING) {
b3a7ea8d
MC		 625 /*
626 * cmd never made it to the xmit thread, so we should not count
627 * the cmd in the sequencing
628 */
629 conn->session->queued_cmdsn--;
b3cd5050
MC		 630 /* it was never sent so just complete like normal */
631 state = ISCSI_TASK_COMPLETED;
632 } else if (err == DID_TRANSPORT_DISRUPTED)
633 state = ISCSI_TASK_ABRT_SESS_RECOV;
634 else
635 state = ISCSI_TASK_ABRT_TMF;
b3a7ea8d 636
b3cd5050 637 sc->result = err << 16;
c07d4444
BH		 638 if (!scsi_bidi_cmnd(sc))
639 scsi_set_resid(sc, scsi_bufflen(sc));
640 else {
641 scsi_out(sc)->resid = scsi_out(sc)->length;
642 scsi_in(sc)->resid = scsi_in(sc)->length;
643 }
3e5c28ad 644
b3cd5050 645 iscsi_complete_task(task, state);
b3a7ea8d
MC		 646}
647
3e5c28ad 648static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 649 struct iscsi_task *task)
052d0144
MC		 650{
651 struct iscsi_session *session = conn->session;
577577da 652 struct iscsi_hdr *hdr = task->hdr;
052d0144 653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
4f704dc0 654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
052d0144
MC		 655
656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
657 return -ENOTCONN;
658
4f704dc0 659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
052d0144
MC		 660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
661 /*
662 * pre-format CmdSN for outgoing PDU.
663 */
664 nop->cmdsn = cpu_to_be32(session->cmdsn);
665 if (hdr->itt != RESERVED_ITT) {
052d0144 666 /*
4f704dc0 667 * TODO: We always use immediate for normal session pdus.
052d0144
MC		 668 * If we start to send tmfs or nops as non-immediate then
669 * we should start checking the cmdsn numbers for mgmt tasks.
4f704dc0
MC		 670 *
671 * During discovery sessions iscsid sends TEXT as non immediate,
672 * but we always only send one PDU at a time.
052d0144
MC		 673 */
674 if (conn->c_stage == ISCSI_CONN_STARTED &&
675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
676 session->queued_cmdsn++;
677 session->cmdsn++;
678 }
679 }
680
ae15f801
MC		 681 if (session->tt->init_task && session->tt->init_task(task))
682 return -EIO;
052d0144
MC		 683
684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
685 session->state = ISCSI_STATE_LOGGING_OUT;
686
577577da 687 task->state = ISCSI_TASK_RUNNING;
1b2c7af8
MC		 688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
690 hdr->itt, task->data_count);
052d0144
MC		 691 return 0;
692}
693
9c19a7d0 694static struct iscsi_task *
f6d5180c
MC		 695__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
696 char *data, uint32_t data_size)
697{
698 struct iscsi_session *session = conn->session;
1336aed1 699 struct iscsi_host *ihost = shost_priv(session->host);
4f704dc0 700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
9c19a7d0 701 struct iscsi_task *task;
262ef636 702 itt_t itt;
f6d5180c
MC		 703
704 if (session->state == ISCSI_STATE_TERMINATE)
705 return NULL;
706
4f704dc0 707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
f6d5180c
MC		 708 /*
709 * Login and Text are sent serially, in
710 * request-followed-by-response sequence.
3e5c28ad
MC		 711 * Same task can be used. Same ITT must be used.
712 * Note that login_task is preallocated at conn_create().
f6d5180c 713 */
4f704dc0
MC		 714 if (conn->login_task->state != ISCSI_TASK_FREE) {
715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
716 "progress. Cannot start new task.\n");
717 return NULL;
718 }
719
9c19a7d0 720 task = conn->login_task;
4f704dc0 721 } else {
26013ad4
MC		 722 if (session->state != ISCSI_STATE_LOGGED_IN)
723 return NULL;
724
f6d5180c
MC		 725 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
726 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
727
7acd72eb 728 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 729 (void*)&task, sizeof(void*)))
f6d5180c
MC		 730 return NULL;
731 }
3e5c28ad
MC		 732 /*
733 * released in complete pdu for task we expect a response for, and
734 * released by the lld when it has transmitted the task for
735 * pdus we do not expect a response for.
736 */
9c19a7d0
MC		 737 atomic_set(&task->refcount, 1);
738 task->conn = conn;
739 task->sc = NULL;
3bbaaad9
MC		 740 INIT_LIST_HEAD(&task->running);
741 task->state = ISCSI_TASK_PENDING;
f6d5180c
MC		 742
743 if (data_size) {
9c19a7d0
MC		 744 memcpy(task->data, data, data_size);
745 task->data_count = data_size;
f6d5180c 746 } else
9c19a7d0 747 task->data_count = 0;
f6d5180c 748
184b57c6
MC		 749 if (conn->session->tt->alloc_pdu) {
750 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
751 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
752 "pdu for mgmt task.\n");
3bbaaad9 753 goto free_task;
184b57c6 754 }
577577da 755 }
184b57c6 756
262ef636 757 itt = task->hdr->itt;
577577da 758 task->hdr_len = sizeof(struct iscsi_hdr);
9c19a7d0 759 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
262ef636
MC		 760
761 if (hdr->itt != RESERVED_ITT) {
762 if (session->tt->parse_pdu_itt)
763 task->hdr->itt = itt;
764 else
765 task->hdr->itt = build_itt(task->itt,
766 task->conn->session->age);
767 }
768
1336aed1 769 if (!ihost->workq) {
577577da
MC		 770 if (iscsi_prep_mgmt_task(conn, task))
771 goto free_task;
052d0144 772
9c19a7d0 773 if (session->tt->xmit_task(task))
577577da 774 goto free_task;
3bbaaad9
MC		 775 } else {
776 list_add_tail(&task->running, &conn->mgmtqueue);
32ae763e 777 iscsi_conn_queue_work(conn);
3bbaaad9 778 }
052d0144 779
9c19a7d0 780 return task;
577577da
MC		 781
782free_task:
783 __iscsi_put_task(task);
784 return NULL;
f6d5180c
MC		 785}
786
787int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
788 char *data, uint32_t data_size)
789{
790 struct iscsi_conn *conn = cls_conn->dd_data;
791 struct iscsi_session *session = conn->session;
792 int err = 0;
793
794 spin_lock_bh(&session->lock);
795 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
796 err = -EPERM;
797 spin_unlock_bh(&session->lock);
f6d5180c
MC		 798 return err;
799}
800EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
801
7996a778
MC		 802/**
803 * iscsi_cmd_rsp - SCSI Command Response processing
804 * @conn: iscsi connection
805 * @hdr: iscsi header
9c19a7d0 806 * @task: scsi command task
7996a778
MC		 807 * @data: cmd data buffer
808 * @datalen: len of buffer
809 *
810 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
9c19a7d0 811 * then completes the command and task.
7996a778 812 **/
77a23c21 813static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 814 struct iscsi_task *task, char *data,
77a23c21 815 int datalen)
7996a778 816{
12352183 817 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
7996a778 818 struct iscsi_session *session = conn->session;
9c19a7d0 819 struct scsi_cmnd *sc = task->sc;
7996a778 820
77a23c21 821 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 822 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
823
824 sc->result = (DID_OK << 16) | rhdr->cmd_status;
825
826 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
827 sc->result = DID_ERROR << 16;
828 goto out;
829 }
830
831 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 832 uint16_t senselen;
7996a778
MC		 833
834 if (datalen < 2) {
835invalid_datalen:
322d739d
MC		 836 iscsi_conn_printk(KERN_ERR, conn,
837 "Got CHECK_CONDITION but invalid data "
838 "buffer size of %d\n", datalen);
7996a778
MC		 839 sc->result = DID_BAD_TARGET << 16;
840 goto out;
841 }
842
8f333991 843 senselen = get_unaligned_be16(data);
7996a778
MC		 844 if (datalen < senselen)
845 goto invalid_datalen;
846
847 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 848 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
1b2c7af8
MC		 849 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
850 min_t(uint16_t, senselen,
851 SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 852 }
853
c07d4444
BH		 854 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
855 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
856 int res_count = be32_to_cpu(rhdr->bi_residual_count);
857
858 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
859 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
860 res_count <= scsi_in(sc)->length))
861 scsi_in(sc)->resid = res_count;
862 else
863 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
864 }
865
7207fea4
BH		 866 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
867 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 868 int res_count = be32_to_cpu(rhdr->residual_count);
869
7207fea4
BH		 870 if (res_count > 0 &&
871 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
872 res_count <= scsi_bufflen(sc)))
c07d4444 873 /* write side for bidi or uni-io set_resid */
1c138991 874 scsi_set_resid(sc, res_count);
7996a778
MC		 875 else
876 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 877 }
7996a778 878out:
3bbaaad9 879 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
1b2c7af8 880 sc, sc->result, task->itt);
7996a778 881 conn->scsirsp_pdus_cnt++;
b3cd5050 882 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 883}
884
1d9edf02
MC		 885/**
886 * iscsi_data_in_rsp - SCSI Data-In Response processing
887 * @conn: iscsi connection
888 * @hdr: iscsi pdu
889 * @task: scsi command task
890 **/
891static void
892iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
893 struct iscsi_task *task)
894{
895 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
896 struct scsi_cmnd *sc = task->sc;
897
898 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
899 return;
900
edbc9aa0 901 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
1d9edf02
MC		 902 sc->result = (DID_OK << 16) | rhdr->cmd_status;
903 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
904 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
905 ISCSI_FLAG_DATA_OVERFLOW)) {
906 int res_count = be32_to_cpu(rhdr->residual_count);
907
908 if (res_count > 0 &&
909 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
910 res_count <= scsi_in(sc)->length))
911 scsi_in(sc)->resid = res_count;
912 else
913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
914 }
915
3bbaaad9
MC		 916 ISCSI_DBG_SESSION(conn->session, "data in with status done "
917 "[sc %p res %d itt 0x%x]\n",
918 sc, sc->result, task->itt);
1d9edf02 919 conn->scsirsp_pdus_cnt++;
b3cd5050 920 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1d9edf02
MC		 921}
922
7ea8b828
MC		 923static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
924{
925 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
926
927 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
928 conn->tmfrsp_pdus_cnt++;
929
843c0a8a 930 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 931 return;
932
933 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 934 conn->tmf_state = TMF_SUCCESS;
7ea8b828 935 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 936 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 937 else
843c0a8a 938 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 939 wake_up(&conn->ehwait);
940}
941
f6d5180c
MC		 942static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
943{
944 struct iscsi_nopout hdr;
9c19a7d0 945 struct iscsi_task *task;
f6d5180c 946
9c19a7d0 947 if (!rhdr && conn->ping_task)
f6d5180c
MC		 948 return;
949
950 memset(&hdr, 0, sizeof(struct iscsi_nopout));
951 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
952 hdr.flags = ISCSI_FLAG_CMD_FINAL;
953
954 if (rhdr) {
55bdabdf 955 hdr.lun = rhdr->lun;
f6d5180c
MC		 956 hdr.ttt = rhdr->ttt;
957 hdr.itt = RESERVED_ITT;
958 } else
959 hdr.ttt = RESERVED_ITT;
960
9c19a7d0
MC		 961 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
962 if (!task)
322d739d 963 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
d3acf022
MC		 964 else if (!rhdr) {
965 /* only track our nops */
966 conn->ping_task = task;
967 conn->last_ping = jiffies;
968 }
f6d5180c
MC		 969}
970
8afa1439
MC		 971static int iscsi_nop_out_rsp(struct iscsi_task *task,
972 struct iscsi_nopin *nop, char *data, int datalen)
973{
974 struct iscsi_conn *conn = task->conn;
975 int rc = 0;
976
977 if (conn->ping_task != task) {
978 /*
979 * If this is not in response to one of our
980 * nops then it must be from userspace.
981 */
982 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
983 data, datalen))
984 rc = ISCSI_ERR_CONN_FAILED;
985 } else
986 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
987 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
988 return rc;
989}
990
62f38300
MC		 991static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
992 char *data, int datalen)
993{
994 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
995 struct iscsi_hdr rejected_pdu;
8afa1439 996 int opcode, rc = 0;
62f38300
MC		 997
998 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
999
8afa1439
MC		 1000 if (ntoh24(reject->dlength) > datalen ||
1001 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1002 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1003 "pdu. Invalid data length (pdu dlength "
1004 "%u, datalen %d\n", ntoh24(reject->dlength),
1005 datalen);
1006 return ISCSI_ERR_PROTO;
1007 }
1008 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1009 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1010
1011 switch (reject->reason) {
1012 case ISCSI_REASON_DATA_DIGEST_ERROR:
1013 iscsi_conn_printk(KERN_ERR, conn,
1014 "pdu (op 0x%x itt 0x%x) rejected "
1015 "due to DataDigest error.\n",
1016 rejected_pdu.itt, opcode);
1017 break;
1018 case ISCSI_REASON_IMM_CMD_REJECT:
1019 iscsi_conn_printk(KERN_ERR, conn,
1020 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1021 "immediate commands.\n",
1022 rejected_pdu.itt, opcode);
1023 /*
1024 * We only send one TMF at a time so if the target could not
1025 * handle it, then it should get fixed (RFC mandates that
1026 * a target can handle one immediate TMF per conn).
1027 *
1028 * For nops-outs, we could have sent more than one if
1029 * the target is sending us lots of nop-ins
1030 */
1031 if (opcode != ISCSI_OP_NOOP_OUT)
1032 return 0;
62f38300 1033
8afa1439
MC		 1034 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1035 /*
1036 * nop-out in response to target's nop-out rejected.
1037 * Just resend.
1038 */
1039 iscsi_send_nopout(conn,
1040 (struct iscsi_nopin*)&rejected_pdu);
1041 else {
1042 struct iscsi_task *task;
1043 /*
1044 * Our nop as ping got dropped. We know the target
1045 * and transport are ok so just clean up
1046 */
1047 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1048 if (!task) {
1049 iscsi_conn_printk(KERN_ERR, conn,
1050 "Invalid pdu reject. Could "
1051 "not lookup rejected task.\n");
1052 rc = ISCSI_ERR_BAD_ITT;
1053 } else
1054 rc = iscsi_nop_out_rsp(task,
1055 (struct iscsi_nopin*)&rejected_pdu,
1056 NULL, 0);
62f38300 1057 }
8afa1439
MC		 1058 break;
1059 default:
1060 iscsi_conn_printk(KERN_ERR, conn,
1061 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1062 "code 0x%x\n", rejected_pdu.itt,
1063 rejected_pdu.opcode, reject->reason);
1064 break;
62f38300 1065 }
8afa1439 1066 return rc;
62f38300
MC		 1067}
1068
913e5bf4
MC		 1069/**
1070 * iscsi_itt_to_task - look up task by itt
1071 * @conn: iscsi connection
1072 * @itt: itt
1073 *
1074 * This should be used for mgmt tasks like login and nops, or if
1075 * the LDD's itt space does not include the session age.
1076 *
1077 * The session lock must be held.
1078 */
8f9256ce 1079struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
913e5bf4
MC		 1080{
1081 struct iscsi_session *session = conn->session;
262ef636 1082 int i;
913e5bf4
MC		 1083
1084 if (itt == RESERVED_ITT)
1085 return NULL;
1086
262ef636
MC		 1087 if (session->tt->parse_pdu_itt)
1088 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1089 else
1090 i = get_itt(itt);
913e5bf4
MC		 1091 if (i >= session->cmds_max)
1092 return NULL;
1093
1094 return session->cmds[i];
1095}
8f9256ce 1096EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
913e5bf4 1097
7996a778
MC		 1098/**
1099 * __iscsi_complete_pdu - complete pdu
1100 * @conn: iscsi conn
1101 * @hdr: iscsi header
1102 * @data: data buffer
1103 * @datalen: len of data buffer
1104 *
1105 * Completes pdu processing by freeing any resources allocated at
1106 * queuecommand or send generic. session lock must be held and verify
1107 * itt must have been called.
1108 */
913e5bf4
MC		 1109int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1110 char *data, int datalen)
7996a778
MC		 1111{
1112 struct iscsi_session *session = conn->session;
1113 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 1114 struct iscsi_task *task;
7996a778
MC		 1115 uint32_t itt;
1116
f6d5180c 1117 conn->last_recv = jiffies;
0af967f5
MC		 1118 rc = iscsi_verify_itt(conn, hdr->itt);
1119 if (rc)
1120 return rc;
1121
b4377356
AV		 1122 if (hdr->itt != RESERVED_ITT)
1123 itt = get_itt(hdr->itt);
7996a778 1124 else
b4377356 1125 itt = ~0U;
7996a778 1126
1b2c7af8
MC		 1127 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1128 opcode, conn->id, itt, datalen);
7996a778 1129
3e5c28ad 1130 if (itt == ~0U) {
77a23c21 1131 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 1132
7996a778
MC		 1133 switch(opcode) {
1134 case ISCSI_OP_NOOP_IN:
40527afe 1135 if (datalen) {
7996a778 1136 rc = ISCSI_ERR_PROTO;
40527afe
MC		 1137 break;
1138 }
1139
b4377356 1140 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 1141 break;
1142
f6d5180c 1143 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 1144 break;
1145 case ISCSI_OP_REJECT:
62f38300
MC		 1146 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1147 break;
7996a778 1148 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 1149 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 1150 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1151 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 1152 break;
1153 default:
1154 rc = ISCSI_ERR_BAD_OPCODE;
1155 break;
1156 }
3e5c28ad
MC		 1157 goto out;
1158 }
1159
3e5c28ad
MC		 1160 switch(opcode) {
1161 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 1162 case ISCSI_OP_SCSI_DATA_IN:
1163 task = iscsi_itt_to_ctask(conn, hdr->itt);
1164 if (!task)
1165 return ISCSI_ERR_BAD_ITT;
d355e57d 1166 task->last_xfer = jiffies;
913e5bf4
MC		 1167 break;
1168 case ISCSI_OP_R2T:
1169 /*
1170 * LLD handles R2Ts if they need to.
1171 */
1172 return 0;
1173 case ISCSI_OP_LOGOUT_RSP:
1174 case ISCSI_OP_LOGIN_RSP:
1175 case ISCSI_OP_TEXT_RSP:
1176 case ISCSI_OP_SCSI_TMFUNC_RSP:
1177 case ISCSI_OP_NOOP_IN:
1178 task = iscsi_itt_to_task(conn, hdr->itt);
1179 if (!task)
1180 return ISCSI_ERR_BAD_ITT;
1181 break;
1182 default:
1183 return ISCSI_ERR_BAD_OPCODE;
1184 }
1185
1186 switch(opcode) {
1187 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 1188 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 1189 break;
1190 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 1191 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 1192 break;
3e5c28ad
MC		 1193 case ISCSI_OP_LOGOUT_RSP:
1194 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1195 if (datalen) {
1196 rc = ISCSI_ERR_PROTO;
1197 break;
1198 }
1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1200 goto recv_pdu;
1201 case ISCSI_OP_LOGIN_RSP:
1202 case ISCSI_OP_TEXT_RSP:
1203 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1204 /*
1205 * login related PDU's exp_statsn is handled in
1206 * userspace
1207 */
1208 goto recv_pdu;
1209 case ISCSI_OP_SCSI_TMFUNC_RSP:
1210 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1211 if (datalen) {
1212 rc = ISCSI_ERR_PROTO;
1213 break;
1214 }
1215
1216 iscsi_tmf_rsp(conn, hdr);
b3cd5050 1217 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
3e5c28ad
MC		 1218 break;
1219 case ISCSI_OP_NOOP_IN:
1220 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1221 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1222 rc = ISCSI_ERR_PROTO;
1223 break;
1224 }
1225 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1226
8afa1439
MC		 1227 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1228 data, datalen);
3e5c28ad
MC		 1229 break;
1230 default:
1231 rc = ISCSI_ERR_BAD_OPCODE;
1232 break;
1233 }
7996a778 1234
3e5c28ad
MC		 1235out:
1236 return rc;
1237recv_pdu:
1238 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1239 rc = ISCSI_ERR_CONN_FAILED;
b3cd5050 1240 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1241 return rc;
1242}
913e5bf4 1243EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 1244
1245int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1246 char *data, int datalen)
1247{
1248 int rc;
1249
1250 spin_lock(&conn->session->lock);
1251 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1252 spin_unlock(&conn->session->lock);
1253 return rc;
1254}
1255EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1256
0af967f5 1257int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 1258{
1259 struct iscsi_session *session = conn->session;
262ef636 1260 int age = 0, i = 0;
7996a778 1261
0af967f5
MC		 1262 if (itt == RESERVED_ITT)
1263 return 0;
7996a778 1264
262ef636
MC		 1265 if (session->tt->parse_pdu_itt)
1266 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1267 else {
1268 i = get_itt(itt);
1269 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1270 }
1271
1272 if (age != session->age) {
0af967f5
MC		 1273 iscsi_conn_printk(KERN_ERR, conn,
1274 "received itt %x expected session age (%x)\n",
913e5bf4 1275 (__force u32)itt, session->age);
0af967f5
MC		 1276 return ISCSI_ERR_BAD_ITT;
1277 }
7996a778 1278
3e5c28ad
MC		 1279 if (i >= session->cmds_max) {
1280 iscsi_conn_printk(KERN_ERR, conn,
1281 "received invalid itt index %u (max cmds "
1282 "%u.\n", i, session->cmds_max);
1283 return ISCSI_ERR_BAD_ITT;
7996a778 1284 }
7996a778
MC		 1285 return 0;
1286}
1287EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1288
913e5bf4
MC		 1289/**
1290 * iscsi_itt_to_ctask - look up ctask by itt
1291 * @conn: iscsi connection
1292 * @itt: itt
1293 *
1294 * This should be used for cmd tasks.
1295 *
1296 * The session lock must be held.
1297 */
1298struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 1299{
9c19a7d0 1300 struct iscsi_task *task;
0af967f5
MC		 1301
1302 if (iscsi_verify_itt(conn, itt))
1303 return NULL;
1304
913e5bf4
MC		 1305 task = iscsi_itt_to_task(conn, itt);
1306 if (!task || !task->sc)
0af967f5
MC		 1307 return NULL;
1308
913e5bf4
MC		 1309 if (task->sc->SCp.phase != conn->session->age) {
1310 iscsi_session_printk(KERN_ERR, conn->session,
1311 "task's session age %d, expected %d\n",
1312 task->sc->SCp.phase, conn->session->age);
0af967f5 1313 return NULL;
913e5bf4 1314 }
0af967f5 1315
9c19a7d0 1316 return task;
0af967f5
MC		 1317}
1318EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1319
40a06e75 1320void iscsi_session_failure(struct iscsi_session *session,
e5bd7b54
MC		 1321 enum iscsi_err err)
1322{
e5bd7b54
MC		 1323 struct iscsi_conn *conn;
1324 struct device *dev;
e5bd7b54 1325
bfcf72e4 1326 spin_lock_bh(&session->lock);
e5bd7b54
MC		 1327 conn = session->leadconn;
1328 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
bfcf72e4 1329 spin_unlock_bh(&session->lock);
e5bd7b54
MC		 1330 return;
1331 }
1332
1333 dev = get_device(&conn->cls_conn->dev);
bfcf72e4 1334 spin_unlock_bh(&session->lock);
e5bd7b54
MC		 1335 if (!dev)
1336 return;
1337 /*
1338 * if the host is being removed bypass the connection
1339 * recovery initialization because we are going to kill
1340 * the session.
1341 */
1342 if (err == ISCSI_ERR_INVALID_HOST)
1343 iscsi_conn_error_event(conn->cls_conn, err);
1344 else
1345 iscsi_conn_failure(conn, err);
1346 put_device(dev);
1347}
1348EXPORT_SYMBOL_GPL(iscsi_session_failure);
1349
7996a778
MC		 1350void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1351{
1352 struct iscsi_session *session = conn->session;
7996a778 1353
bfcf72e4 1354 spin_lock_bh(&session->lock);
656cffc9 1355 if (session->state == ISCSI_STATE_FAILED) {
bfcf72e4 1356 spin_unlock_bh(&session->lock);
656cffc9
MC		 1357 return;
1358 }
1359
67a61114 1360 if (conn->stop_stage == 0)
7996a778 1361 session->state = ISCSI_STATE_FAILED;
bfcf72e4 1362 spin_unlock_bh(&session->lock);
e5bd7b54 1363
7996a778
MC		 1364 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1365 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1366 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1367}
1368EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1369
77a23c21
MC		 1370static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1371{
1372 struct iscsi_session *session = conn->session;
1373
1374 /*
1375 * Check for iSCSI window and take care of CmdSN wrap-around
1376 */
e0726407 1377 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1b2c7af8
MC		 1378 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1379 "%u MaxCmdSN %u CmdSN %u/%u\n",
1380 session->exp_cmdsn, session->max_cmdsn,
1381 session->cmdsn, session->queued_cmdsn);
77a23c21
MC		 1382 return -ENOSPC;
1383 }
1384 return 0;
1385}
1386
9c19a7d0 1387static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1388{
9c19a7d0 1389 struct iscsi_task *task = conn->task;
843c0a8a 1390 int rc;
77a23c21 1391
70b31c15
MC		 1392 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1393 return -ENODATA;
1394
9c19a7d0 1395 __iscsi_get_task(task);
77a23c21 1396 spin_unlock_bh(&conn->session->lock);
9c19a7d0 1397 rc = conn->session->tt->xmit_task(task);
77a23c21 1398 spin_lock_bh(&conn->session->lock);
d355e57d 1399 if (!rc) {
9c19a7d0 1400 /* done with this task */
d355e57d 1401 task->last_xfer = jiffies;
9c19a7d0 1402 conn->task = NULL;
d355e57d
MC		 1403 }
1404 __iscsi_put_task(task);
77a23c21
MC		 1405 return rc;
1406}
1407
843c0a8a 1408/**
9c19a7d0
MC		 1409 * iscsi_requeue_task - requeue task to run from session workqueue
1410 * @task: task to requeue
843c0a8a 1411 *
9c19a7d0 1412 * LLDs that need to run a task from the session workqueue should call
052d0144
MC		 1413 * this. The session lock must be held. This should only be called
1414 * by software drivers.
843c0a8a 1415 */
9c19a7d0 1416void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1417{
9c19a7d0 1418 struct iscsi_conn *conn = task->conn;
843c0a8a 1419
3bbaaad9
MC		 1420 /*
1421 * this may be on the requeue list already if the xmit_task callout
1422 * is handling the r2ts while we are adding new ones
1423 */
1424 if (list_empty(&task->running))
1425 list_add_tail(&task->running, &conn->requeue);
32ae763e 1426 iscsi_conn_queue_work(conn);
843c0a8a 1427}
9c19a7d0 1428EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1429
7996a778
MC		 1430/**
1431 * iscsi_data_xmit - xmit any command into the scheduled connection
1432 * @conn: iscsi connection
1433 *
1434 * Notes:
1435 * The function can return -EAGAIN in which case the caller must
1436 * re-schedule it again later or recover. '0' return code means
1437 * successful xmit.
1438 **/
1439static int iscsi_data_xmit(struct iscsi_conn *conn)
1440{
5d12c05e 1441 struct iscsi_task *task;
3219e529 1442 int rc = 0;
7996a778 1443
77a23c21 1444 spin_lock_bh(&conn->session->lock);
70b31c15 1445 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1b2c7af8 1446 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
77a23c21 1447 spin_unlock_bh(&conn->session->lock);
3219e529 1448 return -ENODATA;
7996a778 1449 }
7996a778 1450
9c19a7d0
MC		 1451 if (conn->task) {
1452 rc = iscsi_xmit_task(conn);
3219e529 1453 if (rc)
70b31c15 1454 goto done;
7996a778
MC		 1455 }
1456
77a23c21
MC		 1457 /*
1458 * process mgmt pdus like nops before commands since we should
1459 * only have one nop-out as a ping from us and targets should not
1460 * overflow us with nop-ins
1461 */
1462check_mgmt:
843c0a8a 1463 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1464 conn->task = list_entry(conn->mgmtqueue.next,
1465 struct iscsi_task, running);
3bbaaad9 1466 list_del_init(&conn->task->running);
9c19a7d0
MC		 1467 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1468 __iscsi_put_task(conn->task);
1469 conn->task = NULL;
b3a7ea8d
MC		 1470 continue;
1471 }
9c19a7d0 1472 rc = iscsi_xmit_task(conn);
77a23c21 1473 if (rc)
70b31c15 1474 goto done;
7996a778
MC		 1475 }
1476
843c0a8a 1477 /* process pending command queue */
3bbaaad9 1478 while (!list_empty(&conn->cmdqueue)) {
5d12c05e
MC		 1479 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1480 running);
3bbaaad9 1481 list_del_init(&conn->task->running);
b3a7ea8d 1482 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
b3cd5050 1483 fail_scsi_task(conn->task, DID_IMM_RETRY);
b3a7ea8d
MC		 1484 continue;
1485 }
577577da
MC		 1486 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1487 if (rc) {
5d12c05e 1488 if (rc == -ENOMEM || rc == -EACCES) {
3bbaaad9
MC		 1489 list_add_tail(&conn->task->running,
1490 &conn->cmdqueue);
577577da 1491 conn->task = NULL;
70b31c15 1492 goto done;
577577da 1493 } else
b3cd5050 1494 fail_scsi_task(conn->task, DID_ABORT);
004d6530
BH		 1495 continue;
1496 }
9c19a7d0 1497 rc = iscsi_xmit_task(conn);
77a23c21 1498 if (rc)
70b31c15 1499 goto done;
77a23c21 1500 /*
9c19a7d0 1501 * we could continuously get new task requests so
77a23c21
MC		 1502 * we need to check the mgmt queue for nops that need to
1503 * be sent to aviod starvation
1504 */
843c0a8a
MC		 1505 if (!list_empty(&conn->mgmtqueue))
1506 goto check_mgmt;
1507 }
1508
1509 while (!list_empty(&conn->requeue)) {
b3a7ea8d
MC		 1510 /*
1511 * we always do fastlogout - conn stop code will clean up.
1512 */
1513 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1514 break;
1515
5d12c05e
MC		 1516 task = list_entry(conn->requeue.next, struct iscsi_task,
1517 running);
1518 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1519 break;
1520
1521 conn->task = task;
3bbaaad9 1522 list_del_init(&conn->task->running);
9c19a7d0 1523 conn->task->state = ISCSI_TASK_RUNNING;
9c19a7d0 1524 rc = iscsi_xmit_task(conn);
843c0a8a 1525 if (rc)
70b31c15 1526 goto done;
843c0a8a 1527 if (!list_empty(&conn->mgmtqueue))
77a23c21 1528 goto check_mgmt;
7996a778 1529 }
b6c395ed 1530 spin_unlock_bh(&conn->session->lock);
3219e529 1531 return -ENODATA;
7996a778 1532
70b31c15 1533done:
77a23c21 1534 spin_unlock_bh(&conn->session->lock);
3219e529 1535 return rc;
7996a778
MC		 1536}
1537
c4028958 1538static void iscsi_xmitworker(struct work_struct *work)
7996a778 1539{
c4028958
DH		 1540 struct iscsi_conn *conn =
1541 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1542 int rc;
7996a778
MC		 1543 /*
1544 * serialize Xmit worker on a per-connection basis.
1545 */
3219e529
MC		 1546 do {
1547 rc = iscsi_data_xmit(conn);
1548 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1549}
1550
577577da
MC		 1551static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1552 struct scsi_cmnd *sc)
1553{
1554 struct iscsi_task *task;
1555
7acd72eb 1556 if (!kfifo_out(&conn->session->cmdpool.queue,
577577da
MC		 1557 (void *) &task, sizeof(void *)))
1558 return NULL;
1559
1560 sc->SCp.phase = conn->session->age;
1561 sc->SCp.ptr = (char *) task;
1562
1563 atomic_set(&task->refcount, 1);
1564 task->state = ISCSI_TASK_PENDING;
1565 task->conn = conn;
1566 task->sc = sc;
d355e57d
MC		 1567 task->have_checked_conn = false;
1568 task->last_timeout = jiffies;
1569 task->last_xfer = jiffies;
577577da
MC		 1570 INIT_LIST_HEAD(&task->running);
1571 return task;
1572}
1573
7996a778
MC		 1574enum {
1575 FAILURE_BAD_HOST = 1,
1576 FAILURE_SESSION_FAILED,
1577 FAILURE_SESSION_FREED,
1578 FAILURE_WINDOW_CLOSED,
60ecebf5 1579 FAILURE_OOM,
7996a778 1580 FAILURE_SESSION_TERMINATE,
656cffc9 1581 FAILURE_SESSION_IN_RECOVERY,
7996a778 1582 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1583 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1584 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1585};
1586
f41d4721 1587int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
7996a778 1588{
75613521 1589 struct iscsi_cls_session *cls_session;
1336aed1 1590 struct iscsi_host *ihost;
7996a778
MC		 1591 int reason = 0;
1592 struct iscsi_session *session;
1593 struct iscsi_conn *conn;
9c19a7d0 1594 struct iscsi_task *task = NULL;
7996a778 1595
7996a778 1596 sc->result = 0;
f47f2cf5 1597 sc->SCp.ptr = NULL;
7996a778 1598
1336aed1 1599 ihost = shost_priv(host);
7996a778 1600
75613521
MC		 1601 cls_session = starget_to_session(scsi_target(sc->device));
1602 session = cls_session->dd_data;
f41d4721 1603 spin_lock_bh(&session->lock);
7996a778 1604
75613521 1605 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1606 if (reason) {
1607 sc->result = reason;
1608 goto fault;
1609 }
1610
301e0f7e 1611 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9
MC		 1612 /*
1613 * to handle the race between when we set the recovery state
1614 * and block the session we requeue here (commands could
1615 * be entering our queuecommand while a block is starting
1616 * up because the block code is not locked)
1617 */
9000bcd6 1618 switch (session->state) {
301e0f7e 1619 case ISCSI_STATE_FAILED:
9000bcd6 1620 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1621 reason = FAILURE_SESSION_IN_RECOVERY;
301e0f7e
MC		 1622 sc->result = DID_IMM_RETRY << 16;
1623 break;
9000bcd6
MC		 1624 case ISCSI_STATE_LOGGING_OUT:
1625 reason = FAILURE_SESSION_LOGGING_OUT;
301e0f7e
MC		 1626 sc->result = DID_IMM_RETRY << 16;
1627 break;
b3a7ea8d 1628 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1629 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1630 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1631 break;
1632 case ISCSI_STATE_TERMINATE:
656cffc9 1633 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1634 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1635 break;
b3a7ea8d 1636 default:
656cffc9 1637 reason = FAILURE_SESSION_FREED;
6eabafbe 1638 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1639 }
7996a778
MC		 1640 goto fault;
1641 }
1642
7996a778 1643 conn = session->leadconn;
98644047
MC		 1644 if (!conn) {
1645 reason = FAILURE_SESSION_FREED;
6eabafbe 1646 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1647 goto fault;
1648 }
7996a778 1649
661134ad
MC		 1650 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1651 reason = FAILURE_SESSION_IN_RECOVERY;
1652 sc->result = DID_REQUEUE;
1653 goto fault;
1654 }
1655
77a23c21
MC		 1656 if (iscsi_check_cmdsn_window_closed(conn)) {
1657 reason = FAILURE_WINDOW_CLOSED;
1658 goto reject;
1659 }
1660
577577da
MC		 1661 task = iscsi_alloc_task(conn, sc);
1662 if (!task) {
60ecebf5
MC		 1663 reason = FAILURE_OOM;
1664 goto reject;
1665 }
7996a778 1666
1336aed1 1667 if (!ihost->workq) {
577577da
MC		 1668 reason = iscsi_prep_scsi_cmd_pdu(task);
1669 if (reason) {
5d12c05e 1670 if (reason == -ENOMEM || reason == -EACCES) {
577577da
MC		 1671 reason = FAILURE_OOM;
1672 goto prepd_reject;
1673 } else {
1674 sc->result = DID_ABORT << 16;
1675 goto prepd_fault;
1676 }
052d0144 1677 }
9c19a7d0 1678 if (session->tt->xmit_task(task)) {
d3305f34 1679 session->cmdsn--;
052d0144 1680 reason = FAILURE_SESSION_NOT_READY;
577577da 1681 goto prepd_reject;
052d0144 1682 }
3bbaaad9
MC		 1683 } else {
1684 list_add_tail(&task->running, &conn->cmdqueue);
32ae763e 1685 iscsi_conn_queue_work(conn);
3bbaaad9 1686 }
052d0144
MC		 1687
1688 session->queued_cmdsn++;
f41d4721 1689 spin_unlock_bh(&session->lock);
7996a778
MC		 1690 return 0;
1691
577577da 1692prepd_reject:
f41d4721 1693 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1694reject:
f41d4721 1695 spin_unlock_bh(&session->lock);
1b2c7af8
MC		 1696 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1697 sc->cmnd[0], reason);
d6d13ee1 1698 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778 1699
577577da 1700prepd_fault:
f41d4721 1701 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1702fault:
f41d4721 1703 spin_unlock_bh(&session->lock);
1b2c7af8
MC		 1704 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1705 sc->cmnd[0], reason);
c07d4444
BH		 1706 if (!scsi_bidi_cmnd(sc))
1707 scsi_set_resid(sc, scsi_bufflen(sc));
1708 else {
1709 scsi_out(sc)->resid = scsi_out(sc)->length;
1710 scsi_in(sc)->resid = scsi_in(sc)->length;
1711 }
f41d4721 1712 sc->scsi_done(sc);
7996a778
MC		 1713 return 0;
1714}
1715EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1716
e881a172 1717int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
7996a778 1718{
1796e722
MC		 1719 switch (reason) {
1720 case SCSI_QDEPTH_DEFAULT:
1721 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1722 break;
1723 case SCSI_QDEPTH_QFULL:
1724 scsi_track_queue_full(sdev, depth);
1725 break;
1726 case SCSI_QDEPTH_RAMP_UP:
1727 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1728 break;
1729 default:
e881a172 1730 return -EOPNOTSUPP;
1796e722 1731 }
7996a778
MC		 1732 return sdev->queue_depth;
1733}
1734EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1735
6b5d6c44
MC		 1736int iscsi_target_alloc(struct scsi_target *starget)
1737{
1738 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1739 struct iscsi_session *session = cls_session->dd_data;
1740
1741 starget->can_queue = session->scsi_cmds_max;
1742 return 0;
1743}
1744EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1745
843c0a8a 1746static void iscsi_tmf_timedout(unsigned long data)
7996a778 1747{
843c0a8a 1748 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1749 struct iscsi_session *session = conn->session;
1750
1751 spin_lock(&session->lock);
843c0a8a
MC		 1752 if (conn->tmf_state == TMF_QUEUED) {
1753 conn->tmf_state = TMF_TIMEDOUT;
bd2199d4 1754 ISCSI_DBG_EH(session, "tmf timedout\n");
7996a778
MC		 1755 /* unblock eh_abort() */
1756 wake_up(&conn->ehwait);
1757 }
1758 spin_unlock(&session->lock);
1759}
1760
9c19a7d0 1761static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1762 struct iscsi_tm *hdr, int age,
1763 int timeout)
7996a778 1764{
7996a778 1765 struct iscsi_session *session = conn->session;
9c19a7d0 1766 struct iscsi_task *task;
7996a778 1767
9c19a7d0 1768 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1769 NULL, 0);
9c19a7d0 1770 if (!task) {
6724add1 1771 spin_unlock_bh(&session->lock);
df4da5cd 1772 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
7996a778 1773 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a 1774 spin_lock_bh(&session->lock);
77a23c21 1775 return -EPERM;
7996a778 1776 }
843c0a8a 1777 conn->tmfcmd_pdus_cnt++;
f6d5180c 1778 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1779 conn->tmf_timer.function = iscsi_tmf_timedout;
1780 conn->tmf_timer.data = (unsigned long)conn;
1781 add_timer(&conn->tmf_timer);
bd2199d4 1782 ISCSI_DBG_EH(session, "tmf set timeout\n");
7996a778 1783
7996a778 1784 spin_unlock_bh(&session->lock);
6724add1 1785 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1786
1787 /*
1788 * block eh thread until:
1789 *
843c0a8a
MC		 1790 * 1) tmf response
1791 * 2) tmf timeout
7996a778
MC		 1792 * 3) session is terminated or restarted or userspace has
1793 * given up on recovery
1794 */
843c0a8a 1795 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1796 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1797 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1798 if (signal_pending(current))
1799 flush_signals(current);
843c0a8a
MC		 1800 del_timer_sync(&conn->tmf_timer);
1801
6724add1 1802 mutex_lock(&session->eh_mutex);
77a23c21 1803 spin_lock_bh(&session->lock);
9c19a7d0 1804 /* if the session drops it will clean up the task */
843c0a8a
MC		 1805 if (age != session->age ||
1806 session->state != ISCSI_STATE_LOGGED_IN)
1807 return -ENOTCONN;
7996a778
MC		 1808 return 0;
1809}
1810
843c0a8a
MC		 1811/*
1812 * Fail commands. session lock held and recv side suspended and xmit
1813 * thread flushed
1814 */
3bbaaad9
MC		 1815static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1816 int error)
843c0a8a 1817{
3bbaaad9
MC		 1818 struct iscsi_task *task;
1819 int i;
843c0a8a 1820
3bbaaad9
MC		 1821 for (i = 0; i < conn->session->cmds_max; i++) {
1822 task = conn->session->cmds[i];
1823 if (!task->sc || task->state == ISCSI_TASK_FREE)
1824 continue;
843c0a8a 1825
3bbaaad9
MC		 1826 if (lun != -1 && lun != task->sc->device->lun)
1827 continue;
843c0a8a 1828
3bbaaad9
MC		 1829 ISCSI_DBG_SESSION(conn->session,
1830 "failing sc %p itt 0x%x state %d\n",
1831 task->sc, task->itt, task->state);
b3cd5050 1832 fail_scsi_task(task, error);
843c0a8a
MC		 1833 }
1834}
1835
661134ad
MC		 1836/**
1837 * iscsi_suspend_queue - suspend iscsi_queuecommand
1838 * @conn: iscsi conn to stop queueing IO on
1839 *
1840 * This grabs the session lock to make sure no one is in
1841 * xmit_task/queuecommand, and then sets suspend to prevent
1842 * new commands from being queued. This only needs to be called
1843 * by offload drivers that need to sync a path like ep disconnect
1844 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1845 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1846 */
1847void iscsi_suspend_queue(struct iscsi_conn *conn)
1848{
1849 spin_lock_bh(&conn->session->lock);
1850 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1851 spin_unlock_bh(&conn->session->lock);
1852}
1853EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1854
1855/**
1856 * iscsi_suspend_tx - suspend iscsi_data_xmit
1857 * @conn: iscsi conn tp stop processing IO on.
1858 *
1859 * This function sets the suspend bit to prevent iscsi_data_xmit
1860 * from sending new IO, and if work is queued on the xmit thread
1861 * it will wait for it to be completed.
1862 */
b40977d9 1863void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1 1864{
32ae763e
MC		 1865 struct Scsi_Host *shost = conn->session->host;
1866 struct iscsi_host *ihost = shost_priv(shost);
1867
6724add1 1868 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1869 if (ihost->workq)
32ae763e 1870 flush_workqueue(ihost->workq);
6724add1 1871}
b40977d9 1872EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1873
1874static void iscsi_start_tx(struct iscsi_conn *conn)
1875{
1876 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1877 iscsi_conn_queue_work(conn);
6724add1
MC		 1878}
1879
4c48a829
MC		 1880/*
1881 * We want to make sure a ping is in flight. It has timed out.
1882 * And we are not busy processing a pdu that is making
1883 * progress but got started before the ping and is taking a while
1884 * to complete so the ping is just stuck behind it in a queue.
1885 */
1886static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1887{
1888 if (conn->ping_task &&
1889 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1890 (conn->ping_timeout * HZ), jiffies))
1891 return 1;
1892 else
1893 return 0;
1894}
1895
d355e57d 1896static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
f6d5180c 1897{
d355e57d 1898 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
92ed4d69 1899 struct iscsi_task *task = NULL, *running_task;
f6d5180c
MC		 1900 struct iscsi_cls_session *cls_session;
1901 struct iscsi_session *session;
1902 struct iscsi_conn *conn;
92ed4d69 1903 int i;
f6d5180c 1904
d355e57d 1905 cls_session = starget_to_session(scsi_target(sc->device));
75613521 1906 session = cls_session->dd_data;
f6d5180c 1907
bd2199d4 1908 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
f6d5180c
MC		 1909
1910 spin_lock(&session->lock);
1911 if (session->state != ISCSI_STATE_LOGGED_IN) {
1912 /*
1913 * We are probably in the middle of iscsi recovery so let
1914 * that complete and handle the error.
1915 */
242f9dcb 1916 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1917 goto done;
1918 }
1919
1920 conn = session->leadconn;
1921 if (!conn) {
1922 /* In the middle of shuting down */
242f9dcb 1923 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1924 goto done;
1925 }
1926
d355e57d 1927 task = (struct iscsi_task *)sc->SCp.ptr;
92ed4d69
MC		 1928 if (!task) {
1929 /*
1930 * Raced with completion. Just reset timer, and let it
1931 * complete normally
1932 */
1933 rc = BLK_EH_RESET_TIMER;
d355e57d 1934 goto done;
92ed4d69
MC		 1935 }
1936
d355e57d
MC		 1937 /*
1938 * If we have sent (at least queued to the network layer) a pdu or
1939 * recvd one for the task since the last timeout ask for
1940 * more time. If on the next timeout we have not made progress
1941 * we can check if it is the task or connection when we send the
1942 * nop as a ping.
1943 */
92ed4d69 1944 if (time_after(task->last_xfer, task->last_timeout)) {
bd2199d4
EZ		 1945 ISCSI_DBG_EH(session, "Command making progress. Asking "
1946 "scsi-ml for more time to complete. "
92ed4d69 1947 "Last data xfer at %lu. Last timeout was at "
bd2199d4 1948 "%lu\n.", task->last_xfer, task->last_timeout);
d355e57d
MC		 1949 task->have_checked_conn = false;
1950 rc = BLK_EH_RESET_TIMER;
1951 goto done;
1952 }
1953
f6d5180c
MC		 1954 if (!conn->recv_timeout && !conn->ping_timeout)
1955 goto done;
1956 /*
1957 * if the ping timedout then we are in the middle of cleaning up
1958 * and can let the iscsi eh handle it
1959 */
4c48a829 1960 if (iscsi_has_ping_timed_out(conn)) {
242f9dcb 1961 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 1962 goto done;
1963 }
d355e57d 1964
92ed4d69
MC		 1965 for (i = 0; i < conn->session->cmds_max; i++) {
1966 running_task = conn->session->cmds[i];
1967 if (!running_task->sc || running_task == task ||
1968 running_task->state != ISCSI_TASK_RUNNING)
1969 continue;
1970
1971 /*
1972 * Only check if cmds started before this one have made
1973 * progress, or this could never fail
1974 */
1975 if (time_after(running_task->sc->jiffies_at_alloc,
1976 task->sc->jiffies_at_alloc))
1977 continue;
1978
1979 if (time_after(running_task->last_xfer, task->last_timeout)) {
1980 /*
1981 * This task has not made progress, but a task
1982 * started before us has transferred data since
1983 * we started/last-checked. We could be queueing
1984 * too many tasks or the LU is bad.
1985 *
1986 * If the device is bad the cmds ahead of us on
1987 * other devs will complete, and this loop will
1988 * eventually fail starting the scsi eh.
1989 */
1990 ISCSI_DBG_EH(session, "Command has not made progress "
1991 "but commands ahead of it have. "
1992 "Asking scsi-ml for more time to "
1993 "complete. Our last xfer vs running task "
1994 "last xfer %lu/%lu. Last check %lu.\n",
1995 task->last_xfer, running_task->last_xfer,
1996 task->last_timeout);
1997 rc = BLK_EH_RESET_TIMER;
1998 goto done;
1999 }
2000 }
2001
d355e57d
MC		 2002 /* Assumes nop timeout is shorter than scsi cmd timeout */
2003 if (task->have_checked_conn)
2004 goto done;
2005
f6d5180c 2006 /*
d355e57d
MC		 2007 * Checking the transport already or nop from a cmd timeout still
2008 * running
f6d5180c 2009 */
d355e57d
MC		 2010 if (conn->ping_task) {
2011 task->have_checked_conn = true;
242f9dcb 2012 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2013 goto done;
2014 }
2015
d355e57d
MC		 2016 /* Make sure there is a transport check done */
2017 iscsi_send_nopout(conn, NULL);
2018 task->have_checked_conn = true;
2019 rc = BLK_EH_RESET_TIMER;
2020
f6d5180c 2021done:
d355e57d
MC		 2022 if (task)
2023 task->last_timeout = jiffies;
f6d5180c 2024 spin_unlock(&session->lock);
bd2199d4
EZ		 2025 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2026 "timer reset" : "nh");
f6d5180c
MC		 2027 return rc;
2028}
2029
2030static void iscsi_check_transport_timeouts(unsigned long data)
2031{
2032 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2033 struct iscsi_session *session = conn->session;
4cf10435 2034 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c
MC		 2035
2036 spin_lock(&session->lock);
2037 if (session->state != ISCSI_STATE_LOGGED_IN)
2038 goto done;
2039
4cf10435
MC		 2040 recv_timeout = conn->recv_timeout;
2041 if (!recv_timeout)
f6d5180c
MC		 2042 goto done;
2043
4cf10435 2044 recv_timeout *= HZ;
f6d5180c 2045 last_recv = conn->last_recv;
4c48a829
MC		 2046
2047 if (iscsi_has_ping_timed_out(conn)) {
322d739d 2048 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
4c48a829
MC		 2049 "expired, recv timeout %d, last rx %lu, "
2050 "last ping %lu, now %lu\n",
2051 conn->ping_timeout, conn->recv_timeout,
2052 last_recv, conn->last_ping, jiffies);
f6d5180c
MC		 2053 spin_unlock(&session->lock);
2054 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2055 return;
2056 }
2057
4cf10435 2058 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97 2059 /* send a ping to try to provoke some traffic */
1b2c7af8 2060 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
c8611f97 2061 iscsi_send_nopout(conn, NULL);
4cf10435 2062 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 2063 } else
4cf10435 2064 next_timeout = last_recv + recv_timeout;
f6d5180c 2065
1b2c7af8 2066 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
ad294e9c 2067 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 2068done:
2069 spin_unlock(&session->lock);
2070}
2071
9c19a7d0 2072static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 2073 struct iscsi_tm *hdr)
2074{
2075 memset(hdr, 0, sizeof(*hdr));
2076 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2077 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2078 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2079 hdr->lun = task->lun;
577577da
MC		 2080 hdr->rtt = task->hdr_itt;
2081 hdr->refcmdsn = task->cmdsn;
843c0a8a
MC		 2082}
2083
7996a778
MC		 2084int iscsi_eh_abort(struct scsi_cmnd *sc)
2085{
75613521
MC		 2086 struct iscsi_cls_session *cls_session;
2087 struct iscsi_session *session;
f47f2cf5 2088 struct iscsi_conn *conn;
9c19a7d0 2089 struct iscsi_task *task;
843c0a8a
MC		 2090 struct iscsi_tm *hdr;
2091 int rc, age;
7996a778 2092
75613521
MC		 2093 cls_session = starget_to_session(scsi_target(sc->device));
2094 session = cls_session->dd_data;
2095
bd2199d4 2096 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
4421c9eb 2097
6724add1
MC		 2098 mutex_lock(&session->eh_mutex);
2099 spin_lock_bh(&session->lock);
f47f2cf5
MC		 2100 /*
2101 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2102 * got the command.
2103 */
2104 if (!sc->SCp.ptr) {
bd2199d4
EZ		 2105 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2106 "it completed.\n");
6724add1
MC		 2107 spin_unlock_bh(&session->lock);
2108 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 2109 return SUCCESS;
2110 }
2111
7996a778
MC		 2112 /*
2113 * If we are not logged in or we have started a new session
2114 * then let the host reset code handle this
2115 */
843c0a8a
MC		 2116 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2117 sc->SCp.phase != session->age) {
2118 spin_unlock_bh(&session->lock);
2119 mutex_unlock(&session->eh_mutex);
bd2199d4 2120 ISCSI_DBG_EH(session, "failing abort due to dropped "
4421c9eb 2121 "session.\n");
843c0a8a
MC		 2122 return FAILED;
2123 }
2124
2125 conn = session->leadconn;
2126 conn->eh_abort_cnt++;
2127 age = session->age;
2128
9c19a7d0 2129 task = (struct iscsi_task *)sc->SCp.ptr;
bd2199d4
EZ		 2130 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2131 sc, task->itt);
7996a778 2132
9c19a7d0
MC		 2133 /* task completed before time out */
2134 if (!task->sc) {
bd2199d4 2135 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
77a23c21 2136 goto success;
7ea8b828 2137 }
7996a778 2138
9c19a7d0 2139 if (task->state == ISCSI_TASK_PENDING) {
b3cd5050 2140 fail_scsi_task(task, DID_ABORT);
77a23c21
MC		 2141 goto success;
2142 }
7996a778 2143
843c0a8a
MC		 2144 /* only have one tmf outstanding at a time */
2145 if (conn->tmf_state != TMF_INITIAL)
7996a778 2146 goto failed;
843c0a8a 2147 conn->tmf_state = TMF_QUEUED;
7996a778 2148
843c0a8a 2149 hdr = &conn->tmhdr;
9c19a7d0 2150 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 2151
9c19a7d0 2152 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 2153 rc = FAILED;
2154 goto failed;
2155 }
2156
2157 switch (conn->tmf_state) {
2158 case TMF_SUCCESS:
77a23c21 2159 spin_unlock_bh(&session->lock);
913e5bf4
MC		 2160 /*
2161 * stop tx side incase the target had sent a abort rsp but
2162 * the initiator was still writing out data.
2163 */
6724add1 2164 iscsi_suspend_tx(conn);
77a23c21 2165 /*
913e5bf4
MC		 2166 * we do not stop the recv side because targets have been
2167 * good and have never sent us a successful tmf response
2168 * then sent more data for the cmd.
77a23c21 2169 */
6187c242 2170 spin_lock_bh(&session->lock);
b3cd5050 2171 fail_scsi_task(task, DID_ABORT);
843c0a8a 2172 conn->tmf_state = TMF_INITIAL;
5d12c05e 2173 memset(hdr, 0, sizeof(*hdr));
6187c242 2174 spin_unlock_bh(&session->lock);
6724add1 2175 iscsi_start_tx(conn);
77a23c21 2176 goto success_unlocked;
843c0a8a
MC		 2177 case TMF_TIMEDOUT:
2178 spin_unlock_bh(&session->lock);
df4da5cd 2179 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2180 goto failed_unlocked;
2181 case TMF_NOT_FOUND:
2182 if (!sc->SCp.ptr) {
2183 conn->tmf_state = TMF_INITIAL;
5d12c05e 2184 memset(hdr, 0, sizeof(*hdr));
9c19a7d0 2185 /* task completed before tmf abort response */
bd2199d4
EZ		 2186 ISCSI_DBG_EH(session, "sc completed while abort in "
2187 "progress\n");
77a23c21 2188 goto success;
7ea8b828
MC		 2189 }
2190 /* fall through */
2191 default:
843c0a8a
MC		 2192 conn->tmf_state = TMF_INITIAL;
2193 goto failed;
7996a778
MC		 2194 }
2195
77a23c21 2196success:
7996a778 2197 spin_unlock_bh(&session->lock);
77a23c21 2198success_unlocked:
bd2199d4
EZ		 2199 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2200 sc, task->itt);
6724add1 2201 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2202 return SUCCESS;
2203
2204failed:
2205 spin_unlock_bh(&session->lock);
77a23c21 2206failed_unlocked:
bd2199d4
EZ		 2207 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2208 task ? task->itt : 0);
6724add1 2209 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2210 return FAILED;
2211}
2212EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2213
843c0a8a
MC		 2214static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2215{
2216 memset(hdr, 0, sizeof(*hdr));
2217 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2218 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2219 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2220 int_to_scsilun(sc->device->lun, &hdr->lun);
f6d5180c 2221 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 2222}
2223
2224int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2225{
75613521
MC		 2226 struct iscsi_cls_session *cls_session;
2227 struct iscsi_session *session;
843c0a8a
MC		 2228 struct iscsi_conn *conn;
2229 struct iscsi_tm *hdr;
2230 int rc = FAILED;
2231
75613521
MC		 2232 cls_session = starget_to_session(scsi_target(sc->device));
2233 session = cls_session->dd_data;
2234
bd2199d4 2235 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
843c0a8a
MC		 2236
2237 mutex_lock(&session->eh_mutex);
2238 spin_lock_bh(&session->lock);
2239 /*
2240 * Just check if we are not logged in. We cannot check for
2241 * the phase because the reset could come from a ioctl.
2242 */
2243 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2244 goto unlock;
2245 conn = session->leadconn;
2246
2247 /* only have one tmf outstanding at a time */
2248 if (conn->tmf_state != TMF_INITIAL)
2249 goto unlock;
2250 conn->tmf_state = TMF_QUEUED;
2251
2252 hdr = &conn->tmhdr;
2253 iscsi_prep_lun_reset_pdu(sc, hdr);
2254
9c19a7d0 2255 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 2256 session->lu_reset_timeout)) {
843c0a8a
MC		 2257 rc = FAILED;
2258 goto unlock;
2259 }
2260
2261 switch (conn->tmf_state) {
2262 case TMF_SUCCESS:
2263 break;
2264 case TMF_TIMEDOUT:
2265 spin_unlock_bh(&session->lock);
df4da5cd 2266 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2267 goto done;
2268 default:
2269 conn->tmf_state = TMF_INITIAL;
2270 goto unlock;
2271 }
2272
2273 rc = SUCCESS;
2274 spin_unlock_bh(&session->lock);
2275
2276 iscsi_suspend_tx(conn);
913e5bf4 2277
a3439148 2278 spin_lock_bh(&session->lock);
5d12c05e 2279 memset(hdr, 0, sizeof(*hdr));
3bbaaad9 2280 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
843c0a8a 2281 conn->tmf_state = TMF_INITIAL;
a3439148 2282 spin_unlock_bh(&session->lock);
843c0a8a
MC		 2283
2284 iscsi_start_tx(conn);
2285 goto done;
2286
2287unlock:
2288 spin_unlock_bh(&session->lock);
2289done:
bd2199d4
EZ		 2290 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2291 rc == SUCCESS ? "SUCCESS" : "FAILED");
843c0a8a
MC		 2292 mutex_unlock(&session->eh_mutex);
2293 return rc;
2294}
2295EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2296
3fe5ae8b
MC		 2297void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2298{
2299 struct iscsi_session *session = cls_session->dd_data;
2300
2301 spin_lock_bh(&session->lock);
2302 if (session->state != ISCSI_STATE_LOGGED_IN) {
2303 session->state = ISCSI_STATE_RECOVERY_FAILED;
2304 if (session->leadconn)
2305 wake_up(&session->leadconn->ehwait);
2306 }
2307 spin_unlock_bh(&session->lock);
2308}
2309EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2310
2311/**
2312 * iscsi_eh_session_reset - drop session and attempt relogin
2313 * @sc: scsi command
2314 *
2315 * This function will wait for a relogin, session termination from
2316 * userspace, or a recovery/replacement timeout.
2317 */
309ce156 2318int iscsi_eh_session_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2319{
2320 struct iscsi_cls_session *cls_session;
2321 struct iscsi_session *session;
2322 struct iscsi_conn *conn;
2323
2324 cls_session = starget_to_session(scsi_target(sc->device));
2325 session = cls_session->dd_data;
2326 conn = session->leadconn;
2327
2328 mutex_lock(&session->eh_mutex);
2329 spin_lock_bh(&session->lock);
2330 if (session->state == ISCSI_STATE_TERMINATE) {
2331failed:
2332 ISCSI_DBG_EH(session,
2333 "failing session reset: Could not log back into "
2334 "%s, %s [age %d]\n", session->targetname,
2335 conn->persistent_address, session->age);
2336 spin_unlock_bh(&session->lock);
2337 mutex_unlock(&session->eh_mutex);
2338 return FAILED;
2339 }
2340
2341 spin_unlock_bh(&session->lock);
2342 mutex_unlock(&session->eh_mutex);
2343 /*
2344 * we drop the lock here but the leadconn cannot be destoyed while
2345 * we are in the scsi eh
2346 */
df4da5cd 2347 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2348
2349 ISCSI_DBG_EH(session, "wait for relogin\n");
2350 wait_event_interruptible(conn->ehwait,
2351 session->state == ISCSI_STATE_TERMINATE ||
2352 session->state == ISCSI_STATE_LOGGED_IN ||
2353 session->state == ISCSI_STATE_RECOVERY_FAILED);
2354 if (signal_pending(current))
2355 flush_signals(current);
2356
2357 mutex_lock(&session->eh_mutex);
2358 spin_lock_bh(&session->lock);
2359 if (session->state == ISCSI_STATE_LOGGED_IN) {
2360 ISCSI_DBG_EH(session,
2361 "session reset succeeded for %s,%s\n",
2362 session->targetname, conn->persistent_address);
2363 } else
2364 goto failed;
2365 spin_unlock_bh(&session->lock);
2366 mutex_unlock(&session->eh_mutex);
2367 return SUCCESS;
2368}
309ce156 2369EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
3fe5ae8b
MC		 2370
2371static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2372{
2373 memset(hdr, 0, sizeof(*hdr));
2374 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2375 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2376 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2377 hdr->rtt = RESERVED_ITT;
2378}
2379
2380/**
2381 * iscsi_eh_target_reset - reset target
2382 * @sc: scsi command
2383 *
309ce156 2384 * This will attempt to send a warm target reset.
3fe5ae8b
MC		 2385 */
2386int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2387{
2388 struct iscsi_cls_session *cls_session;
2389 struct iscsi_session *session;
2390 struct iscsi_conn *conn;
2391 struct iscsi_tm *hdr;
2392 int rc = FAILED;
2393
2394 cls_session = starget_to_session(scsi_target(sc->device));
2395 session = cls_session->dd_data;
2396
2397 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2398 session->targetname);
2399
2400 mutex_lock(&session->eh_mutex);
2401 spin_lock_bh(&session->lock);
2402 /*
2403 * Just check if we are not logged in. We cannot check for
2404 * the phase because the reset could come from a ioctl.
2405 */
2406 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2407 goto unlock;
2408 conn = session->leadconn;
2409
2410 /* only have one tmf outstanding at a time */
2411 if (conn->tmf_state != TMF_INITIAL)
2412 goto unlock;
2413 conn->tmf_state = TMF_QUEUED;
2414
2415 hdr = &conn->tmhdr;
2416 iscsi_prep_tgt_reset_pdu(sc, hdr);
2417
2418 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2419 session->tgt_reset_timeout)) {
2420 rc = FAILED;
2421 goto unlock;
2422 }
2423
2424 switch (conn->tmf_state) {
2425 case TMF_SUCCESS:
2426 break;
2427 case TMF_TIMEDOUT:
2428 spin_unlock_bh(&session->lock);
df4da5cd 2429 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2430 goto done;
2431 default:
2432 conn->tmf_state = TMF_INITIAL;
2433 goto unlock;
2434 }
2435
2436 rc = SUCCESS;
2437 spin_unlock_bh(&session->lock);
2438
2439 iscsi_suspend_tx(conn);
2440
2441 spin_lock_bh(&session->lock);
2442 memset(hdr, 0, sizeof(*hdr));
2443 fail_scsi_tasks(conn, -1, DID_ERROR);
2444 conn->tmf_state = TMF_INITIAL;
2445 spin_unlock_bh(&session->lock);
2446
2447 iscsi_start_tx(conn);
2448 goto done;
2449
2450unlock:
2451 spin_unlock_bh(&session->lock);
2452done:
2453 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2454 rc == SUCCESS ? "SUCCESS" : "FAILED");
2455 mutex_unlock(&session->eh_mutex);
309ce156
JK		 2456 return rc;
2457}
2458EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
3fe5ae8b 2459
309ce156
JK		 2460/**
2461 * iscsi_eh_recover_target - reset target and possibly the session
2462 * @sc: scsi command
2463 *
2464 * This will attempt to send a warm target reset. If that fails,
2465 * we will escalate to ERL0 session recovery.
2466 */
2467int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2468{
2469 int rc;
2470
2471 rc = iscsi_eh_target_reset(sc);
3fe5ae8b
MC		 2472 if (rc == FAILED)
2473 rc = iscsi_eh_session_reset(sc);
2474 return rc;
2475}
309ce156 2476EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
3fe5ae8b 2477
6320377f
OK		 2478/*
2479 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2480 * should be accessed via kfifo_{get,put} on q->queue.
2481 * Optionally, the caller can obtain the array of object pointers
2482 * by passing in a non-NULL @items pointer
2483 */
7996a778 2484int
6320377f 2485iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 2486{
6320377f 2487 int i, num_arrays = 1;
7996a778 2488
6320377f 2489 memset(q, 0, sizeof(*q));
7996a778
MC		 2490
2491 q->max = max;
6320377f
OK		 2492
2493 /* If the user passed an items pointer, he wants a copy of
2494 * the array. */
2495 if (items)
2496 num_arrays++;
2497 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2498 if (q->pool == NULL)
f474a37b 2499 return -ENOMEM;
7996a778 2500
c1e13f25 2501 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
7996a778
MC		 2502
2503 for (i = 0; i < max; i++) {
6320377f 2504 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 2505 if (q->pool[i] == NULL) {
6320377f
OK		 2506 q->max = i;
2507 goto enomem;
7996a778 2508 }
7acd72eb 2509 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
7996a778 2510 }
6320377f
OK		 2511
2512 if (items) {
2513 *items = q->pool + max;
2514 memcpy(*items, q->pool, max * sizeof(void *));
2515 }
2516
7996a778 2517 return 0;
6320377f
OK		 2518
2519enomem:
2520 iscsi_pool_free(q);
2521 return -ENOMEM;
7996a778
MC		 2522}
2523EXPORT_SYMBOL_GPL(iscsi_pool_init);
2524
6320377f 2525void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 2526{
2527 int i;
2528
2529 for (i = 0; i < q->max; i++)
6320377f 2530 kfree(q->pool[i]);
f474a37b 2531 kfree(q->pool);
7996a778
MC		 2532}
2533EXPORT_SYMBOL_GPL(iscsi_pool_free);
2534
a4804cd6
MC		 2535/**
2536 * iscsi_host_add - add host to system
2537 * @shost: scsi host
2538 * @pdev: parent device
2539 *
2540 * This should be called by partial offload and software iscsi drivers
2541 * to add a host to the system.
2542 */
2543int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2544{
8e9a20ce
MC		 2545 if (!shost->can_queue)
2546 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2547
4d108350
MC		 2548 if (!shost->cmd_per_lun)
2549 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2550
308cec14
MC		 2551 if (!shost->transportt->eh_timed_out)
2552 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
a4804cd6
MC		 2553 return scsi_add_host(shost, pdev);
2554}
2555EXPORT_SYMBOL_GPL(iscsi_host_add);
2556
2557/**
2558 * iscsi_host_alloc - allocate a host and driver data
2559 * @sht: scsi host template
2560 * @dd_data_size: driver host data size
32ae763e 2561 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
a4804cd6
MC		 2562 *
2563 * This should be called by partial offload and software iscsi drivers.
2564 * To access the driver specific memory use the iscsi_host_priv() macro.
2565 */
2566struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
4d108350 2567 int dd_data_size, bool xmit_can_sleep)
75613521 2568{
a4804cd6 2569 struct Scsi_Host *shost;
e5bd7b54 2570 struct iscsi_host *ihost;
a4804cd6
MC		 2571
2572 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2573 if (!shost)
2574 return NULL;
e5bd7b54 2575 ihost = shost_priv(shost);
32ae763e
MC		 2576
2577 if (xmit_can_sleep) {
2578 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2579 "iscsi_q_%d", shost->host_no);
2580 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2581 if (!ihost->workq)
2582 goto free_host;
2583 }
2584
e5bd7b54
MC		 2585 spin_lock_init(&ihost->lock);
2586 ihost->state = ISCSI_HOST_SETUP;
2587 ihost->num_sessions = 0;
2588 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6 2589 return shost;
32ae763e
MC		 2590
2591free_host:
2592 scsi_host_put(shost);
2593 return NULL;
a4804cd6
MC		 2594}
2595EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2596
e5bd7b54
MC		 2597static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2598{
40a06e75 2599 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
e5bd7b54
MC		 2600}
2601
a4804cd6
MC		 2602/**
2603 * iscsi_host_remove - remove host and sessions
2604 * @shost: scsi host
2605 *
e5bd7b54
MC		 2606 * If there are any sessions left, this will initiate the removal and wait
2607 * for the completion.
a4804cd6
MC		 2608 */
2609void iscsi_host_remove(struct Scsi_Host *shost)
2610{
e5bd7b54
MC		 2611 struct iscsi_host *ihost = shost_priv(shost);
2612 unsigned long flags;
2613
2614 spin_lock_irqsave(&ihost->lock, flags);
2615 ihost->state = ISCSI_HOST_REMOVED;
2616 spin_unlock_irqrestore(&ihost->lock, flags);
2617
2618 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2619 wait_event_interruptible(ihost->session_removal_wq,
2620 ihost->num_sessions == 0);
2621 if (signal_pending(current))
2622 flush_signals(current);
2623
a4804cd6 2624 scsi_remove_host(shost);
32ae763e
MC		 2625 if (ihost->workq)
2626 destroy_workqueue(ihost->workq);
75613521 2627}
a4804cd6 2628EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 2629
a4804cd6 2630void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 2631{
2632 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2633
75613521
MC		 2634 kfree(ihost->netdev);
2635 kfree(ihost->hwaddress);
2636 kfree(ihost->initiatorname);
a4804cd6 2637 scsi_host_put(shost);
75613521 2638}
a4804cd6 2639EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2640
e5bd7b54
MC		 2641static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2642{
2643 struct iscsi_host *ihost = shost_priv(shost);
2644 unsigned long flags;
2645
2646 shost = scsi_host_get(shost);
2647 if (!shost) {
2648 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2649 "of session teardown event because host already "
2650 "removed.\n");
2651 return;
2652 }
2653
2654 spin_lock_irqsave(&ihost->lock, flags);
2655 ihost->num_sessions--;
2656 if (ihost->num_sessions == 0)
2657 wake_up(&ihost->session_removal_wq);
2658 spin_unlock_irqrestore(&ihost->lock, flags);
2659 scsi_host_put(shost);
2660}
2661
7996a778
MC		 2662/**
2663 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2664 * @iscsit: iscsi transport template
75613521
MC		 2665 * @shost: scsi host
2666 * @cmds_max: session can queue
9c19a7d0 2667 * @cmd_task_size: LLD task private data size
7996a778 2668 * @initial_cmdsn: initial CmdSN
7996a778
MC		 2669 *
2670 * This can be used by software iscsi_transports that allocate
2671 * a session per scsi host.
3cf7b233
MC		 2672 *
2673 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2674 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2675 * for nop handling and login/logout requests.
75613521 2676 */
7996a778 2677struct iscsi_cls_session *
75613521 2678iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
b8b9e1b8 2679 uint16_t cmds_max, int dd_size, int cmd_task_size,
7970634b 2680 uint32_t initial_cmdsn, unsigned int id)
7996a778 2681{
e5bd7b54 2682 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2683 struct iscsi_session *session;
2684 struct iscsi_cls_session *cls_session;
3cf7b233 2685 int cmd_i, scsi_cmds, total_cmds = cmds_max;
e5bd7b54
MC		 2686 unsigned long flags;
2687
2688 spin_lock_irqsave(&ihost->lock, flags);
2689 if (ihost->state == ISCSI_HOST_REMOVED) {
2690 spin_unlock_irqrestore(&ihost->lock, flags);
2691 return NULL;
2692 }
2693 ihost->num_sessions++;
2694 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce
MC		 2695
2696 if (!total_cmds)
2697 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 2698 /*
3cf7b233
MC		 2699 * The iscsi layer needs some tasks for nop handling and tmfs,
2700 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2701 * + 1 command for scsi IO.
3e5c28ad 2702 */
3cf7b233
MC		 2703 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2704 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2705 "must be a power of two that is at least %d.\n",
2706 total_cmds, ISCSI_TOTAL_CMDS_MIN);
e5bd7b54 2707 goto dec_session_count;
3cf7b233
MC		 2708 }
2709
2710 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2711 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2712 "must be a power of 2 less than or equal to %d.\n",
2713 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2714 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2715 }
2716
2717 if (!is_power_of_2(total_cmds)) {
2718 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2719 "must be a power of 2.\n", total_cmds);
2720 total_cmds = rounddown_pow_of_two(total_cmds);
2721 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2722 return NULL;
2723 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2724 total_cmds);
1548271e 2725 }
3cf7b233 2726 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2727
5d91e209 2728 cls_session = iscsi_alloc_session(shost, iscsit,
b8b9e1b8
JK		 2729 sizeof(struct iscsi_session) +
2730 dd_size);
75613521 2731 if (!cls_session)
e5bd7b54 2732 goto dec_session_count;
75613521
MC		 2733 session = cls_session->dd_data;
2734 session->cls_session = cls_session;
7996a778
MC		 2735 session->host = shost;
2736 session->state = ISCSI_STATE_FREE;
f6d5180c 2737 session->fast_abort = 1;
3fe5ae8b 2738 session->tgt_reset_timeout = 30;
4cd49ea1
MC		 2739 session->lu_reset_timeout = 15;
2740 session->abort_timeout = 10;
3cf7b233
MC		 2741 session->scsi_cmds_max = scsi_cmds;
2742 session->cmds_max = total_cmds;
e0726407 2743 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2744 session->exp_cmdsn = initial_cmdsn + 1;
2745 session->max_cmdsn = initial_cmdsn + 1;
2746 session->max_r2t = 1;
2747 session->tt = iscsit;
b8b9e1b8 2748 session->dd_data = cls_session->dd_data + sizeof(*session);
6724add1 2749 mutex_init(&session->eh_mutex);
75613521 2750 spin_lock_init(&session->lock);
7996a778
MC		 2751
2752 /* initialize SCSI PDU commands pool */
2753 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2754 (void***)&session->cmds,
9c19a7d0 2755 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2756 goto cmdpool_alloc_fail;
2757
2758 /* pre-format cmds pool with ITT */
2759 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2760 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2761
9c19a7d0
MC		 2762 if (cmd_task_size)
2763 task->dd_data = &task[1];
2764 task->itt = cmd_i;
3bbaaad9 2765 task->state = ISCSI_TASK_FREE;
9c19a7d0 2766 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2767 }
2768
f53a88da 2769 if (!try_module_get(iscsit->owner))
75613521 2770 goto module_get_fail;
7996a778 2771
7970634b 2772 if (iscsi_add_session(cls_session, id))
75613521 2773 goto cls_session_fail;
e5bd7b54 2774
7996a778
MC		 2775 return cls_session;
2776
2777cls_session_fail:
75613521
MC		 2778 module_put(iscsit->owner);
2779module_get_fail:
6320377f 2780 iscsi_pool_free(&session->cmdpool);
7996a778 2781cmdpool_alloc_fail:
75613521 2782 iscsi_free_session(cls_session);
e5bd7b54
MC		 2783dec_session_count:
2784 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2785 return NULL;
2786}
2787EXPORT_SYMBOL_GPL(iscsi_session_setup);
2788
2789/**
2790 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2791 * @cls_session: iscsi session
7996a778 2792 *
75613521
MC		 2793 * The driver must have called iscsi_remove_session before
2794 * calling this.
2795 */
7996a778
MC		 2796void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2797{
75613521 2798 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2799 struct module *owner = cls_session->transport->owner;
e5bd7b54 2800 struct Scsi_Host *shost = session->host;
7996a778 2801
6320377f 2802 iscsi_pool_free(&session->cmdpool);
7996a778 2803
b2c64167
MC		 2804 kfree(session->password);
2805 kfree(session->password_in);
2806 kfree(session->username);
2807 kfree(session->username_in);
f3ff0c36 2808 kfree(session->targetname);
88dfd340
MC		 2809 kfree(session->initiatorname);
2810 kfree(session->ifacename);
f3ff0c36 2811
75613521 2812 iscsi_destroy_session(cls_session);
e5bd7b54 2813 iscsi_host_dec_session_cnt(shost);
63f75cc8 2814 module_put(owner);
7996a778
MC		 2815}
2816EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2817
2818/**
2819 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2820 * @cls_session: iscsi_cls_session
5d91e209 2821 * @dd_size: private driver data size
7996a778 2822 * @conn_idx: cid
5d91e209 2823 */
7996a778 2824struct iscsi_cls_conn *
5d91e209
MC		 2825iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2826 uint32_t conn_idx)
7996a778 2827{
75613521 2828 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2829 struct iscsi_conn *conn;
2830 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2831 char *data;
7996a778 2832
5d91e209
MC		 2833 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2834 conn_idx);
7996a778
MC		 2835 if (!cls_conn)
2836 return NULL;
2837 conn = cls_conn->dd_data;
5d91e209 2838 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2839
5d91e209 2840 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2841 conn->session = session;
2842 conn->cls_conn = cls_conn;
2843 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2844 conn->id = conn_idx;
2845 conn->exp_statsn = 0;
843c0a8a 2846 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 2847
2848 init_timer(&conn->transport_timer);
2849 conn->transport_timer.data = (unsigned long)conn;
2850 conn->transport_timer.function = iscsi_check_transport_timeouts;
2851
843c0a8a 2852 INIT_LIST_HEAD(&conn->mgmtqueue);
3bbaaad9 2853 INIT_LIST_HEAD(&conn->cmdqueue);
843c0a8a 2854 INIT_LIST_HEAD(&conn->requeue);
c4028958 2855 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2856
9c19a7d0 2857 /* allocate login_task used for the login/text sequences */
7996a778 2858 spin_lock_bh(&session->lock);
7acd72eb 2859 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 2860 (void*)&conn->login_task,
7996a778
MC		 2861 sizeof(void*))) {
2862 spin_unlock_bh(&session->lock);
9c19a7d0 2863 goto login_task_alloc_fail;
7996a778
MC		 2864 }
2865 spin_unlock_bh(&session->lock);
2866
cfeb2cf9
MC		 2867 data = (char *) __get_free_pages(GFP_KERNEL,
2868 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
d36ab6f3 2869 if (!data)
9c19a7d0
MC		 2870 goto login_task_data_alloc_fail;
2871 conn->login_task->data = conn->data = data;
d36ab6f3 2872
843c0a8a 2873 init_timer(&conn->tmf_timer);
7996a778
MC		 2874 init_waitqueue_head(&conn->ehwait);
2875
2876 return cls_conn;
2877
9c19a7d0 2878login_task_data_alloc_fail:
7acd72eb 2879 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2880 sizeof(void*));
9c19a7d0 2881login_task_alloc_fail:
7996a778
MC		 2882 iscsi_destroy_conn(cls_conn);
2883 return NULL;
2884}
2885EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2886
2887/**
2888 * iscsi_conn_teardown - teardown iscsi connection
2889 * cls_conn: iscsi class connection
2890 *
2891 * TODO: we may need to make this into a two step process
2892 * like scsi-mls remove + put host
2893 */
2894void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2895{
2896 struct iscsi_conn *conn = cls_conn->dd_data;
2897 struct iscsi_session *session = conn->session;
2898 unsigned long flags;
2899
f6d5180c
MC		 2900 del_timer_sync(&conn->transport_timer);
2901
7996a778
MC		 2902 spin_lock_bh(&session->lock);
2903 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2904 if (session->leadconn == conn) {
2905 /*
2906 * leading connection? then give up on recovery.
2907 */
2908 session->state = ISCSI_STATE_TERMINATE;
2909 wake_up(&conn->ehwait);
2910 }
2911 spin_unlock_bh(&session->lock);
2912
7996a778
MC		 2913 /*
2914 * Block until all in-progress commands for this connection
2915 * time out or fail.
2916 */
2917 for (;;) {
2918 spin_lock_irqsave(session->host->host_lock, flags);
2919 if (!session->host->host_busy) { /* OK for ERL == 0 */
2920 spin_unlock_irqrestore(session->host->host_lock, flags);
2921 break;
2922 }
2923 spin_unlock_irqrestore(session->host->host_lock, flags);
2924 msleep_interruptible(500);
322d739d
MC		 2925 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2926 "host_busy %d host_failed %d\n",
2927 session->host->host_busy,
2928 session->host->host_failed);
7996a778
MC		 2929 /*
2930 * force eh_abort() to unblock
2931 */
2932 wake_up(&conn->ehwait);
2933 }
2934
779ea120 2935 /* flush queued up work because we free the connection below */
843c0a8a 2936 iscsi_suspend_tx(conn);
779ea120 2937
7996a778 2938 spin_lock_bh(&session->lock);
cfeb2cf9
MC		 2939 free_pages((unsigned long) conn->data,
2940 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
f3ff0c36 2941 kfree(conn->persistent_address);
7acd72eb 2942 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
7996a778 2943 sizeof(void*));
e0726407 2944 if (session->leadconn == conn)
7996a778 2945 session->leadconn = NULL;
7996a778
MC		 2946 spin_unlock_bh(&session->lock);
2947
7996a778
MC		 2948 iscsi_destroy_conn(cls_conn);
2949}
2950EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2951
2952int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2953{
2954 struct iscsi_conn *conn = cls_conn->dd_data;
2955 struct iscsi_session *session = conn->session;
2956
ffd0436e 2957 if (!session) {
322d739d
MC		 2958 iscsi_conn_printk(KERN_ERR, conn,
2959 "can't start unbound connection\n");
7996a778
MC		 2960 return -EPERM;
2961 }
2962
db98ccde
MC		 2963 if ((session->imm_data_en || !session->initial_r2t_en) &&
2964 session->first_burst > session->max_burst) {
322d739d
MC		 2965 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2966 "first_burst %d max_burst %d\n",
2967 session->first_burst, session->max_burst);
ffd0436e
MC		 2968 return -EINVAL;
2969 }
2970
f6d5180c 2971 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2972 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2973 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2974 conn->recv_timeout = 5;
2975 }
2976
2977 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2978 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2979 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2980 conn->ping_timeout = 5;
2981 }
2982
7996a778
MC		 2983 spin_lock_bh(&session->lock);
2984 conn->c_stage = ISCSI_CONN_STARTED;
2985 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2986 session->queued_cmdsn = session->cmdsn;
7996a778 2987
f6d5180c
MC		 2988 conn->last_recv = jiffies;
2989 conn->last_ping = jiffies;
2990 if (conn->recv_timeout && conn->ping_timeout)
2991 mod_timer(&conn->transport_timer,
2992 jiffies + (conn->recv_timeout * HZ));
2993
7996a778
MC		 2994 switch(conn->stop_stage) {
2995 case STOP_CONN_RECOVER:
2996 /*
2997 * unblock eh_abort() if it is blocked. re-try all
2998 * commands after successful recovery
2999 */
7996a778 3000 conn->stop_stage = 0;
843c0a8a 3001 conn->tmf_state = TMF_INITIAL;
7996a778 3002 session->age++;
8b1d0343
MC		 3003 if (session->age == 16)
3004 session->age = 0;
6eabafbe 3005 break;
7996a778 3006 case STOP_CONN_TERM:
7996a778 3007 conn->stop_stage = 0;
7996a778
MC		 3008 break;
3009 default:
3010 break;
3011 }
3012 spin_unlock_bh(&session->lock);
3013
75613521 3014 iscsi_unblock_session(session->cls_session);
6eabafbe 3015 wake_up(&conn->ehwait);
7996a778
MC		 3016 return 0;
3017}
3018EXPORT_SYMBOL_GPL(iscsi_conn_start);
3019
3020static void
3bbaaad9 3021fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
7996a778 3022{
3bbaaad9 3023 struct iscsi_task *task;
b3cd5050 3024 int i, state;
7996a778 3025
3bbaaad9
MC		 3026 for (i = 0; i < conn->session->cmds_max; i++) {
3027 task = conn->session->cmds[i];
3028 if (task->sc)
3029 continue;
7996a778 3030
3bbaaad9
MC		 3031 if (task->state == ISCSI_TASK_FREE)
3032 continue;
7996a778 3033
3bbaaad9
MC		 3034 ISCSI_DBG_SESSION(conn->session,
3035 "failing mgmt itt 0x%x state %d\n",
3036 task->itt, task->state);
b3cd5050
MC		 3037 state = ISCSI_TASK_ABRT_SESS_RECOV;
3038 if (task->state == ISCSI_TASK_PENDING)
3039 state = ISCSI_TASK_COMPLETED;
3040 iscsi_complete_task(task, state);
3041
3bbaaad9 3042 }
7996a778
MC		 3043}
3044
656cffc9
MC		 3045static void iscsi_start_session_recovery(struct iscsi_session *session,
3046 struct iscsi_conn *conn, int flag)
7996a778 3047{
ed2abc7f
MC		 3048 int old_stop_stage;
3049
6724add1 3050 mutex_lock(&session->eh_mutex);
7996a778 3051 spin_lock_bh(&session->lock);
ed2abc7f 3052 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 3053 spin_unlock_bh(&session->lock);
6724add1
MC		 3054 mutex_unlock(&session->eh_mutex);
3055 return;
3056 }
3057
ed2abc7f
MC		 3058 /*
3059 * When this is called for the in_login state, we only want to clean
9c19a7d0 3060 * up the login task and connection. We do not need to block and set
67a61114 3061 * the recovery state again
ed2abc7f 3062 */
67a61114
MC		 3063 if (flag == STOP_CONN_TERM)
3064 session->state = ISCSI_STATE_TERMINATE;
3065 else if (conn->stop_stage != STOP_CONN_RECOVER)
3066 session->state = ISCSI_STATE_IN_RECOVERY;
4ae0a6c1
MC		 3067
3068 old_stop_stage = conn->stop_stage;
3069 conn->stop_stage = flag;
26013ad4 3070 spin_unlock_bh(&session->lock);
ed2abc7f 3071
26013ad4
MC		 3072 del_timer_sync(&conn->transport_timer);
3073 iscsi_suspend_tx(conn);
3074
3075 spin_lock_bh(&session->lock);
67a61114 3076 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 3077 spin_unlock_bh(&session->lock);
6724add1 3078
7996a778
MC		 3079 /*
3080 * for connection level recovery we should not calculate
3081 * header digest. conn->hdr_size used for optimization
3082 * in hdr_extract() and will be re-negotiated at
3083 * set_param() time.
3084 */
3085 if (flag == STOP_CONN_RECOVER) {
3086 conn->hdrdgst_en = 0;
3087 conn->datadgst_en = 0;
656cffc9 3088 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114 3089 old_stop_stage != STOP_CONN_RECOVER) {
1b2c7af8 3090 ISCSI_DBG_SESSION(session, "blocking session\n");
75613521 3091 iscsi_block_session(session->cls_session);
67a61114 3092 }
7996a778 3093 }
656cffc9 3094
656cffc9
MC		 3095 /*
3096 * flush queues.
3097 */
3098 spin_lock_bh(&session->lock);
b3cd5050 3099 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3bbaaad9 3100 fail_mgmt_tasks(session, conn);
5d12c05e 3101 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
656cffc9 3102 spin_unlock_bh(&session->lock);
6724add1 3103 mutex_unlock(&session->eh_mutex);
7996a778 3104}
7996a778
MC		 3105
3106void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3107{
3108 struct iscsi_conn *conn = cls_conn->dd_data;
3109 struct iscsi_session *session = conn->session;
3110
3111 switch (flag) {
3112 case STOP_CONN_RECOVER:
3113 case STOP_CONN_TERM:
3114 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 3115 break;
7996a778 3116 default:
322d739d
MC		 3117 iscsi_conn_printk(KERN_ERR, conn,
3118 "invalid stop flag %d\n", flag);
7996a778
MC		 3119 }
3120}
3121EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3122
3123int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3124 struct iscsi_cls_conn *cls_conn, int is_leading)
3125{
75613521 3126 struct iscsi_session *session = cls_session->dd_data;
98644047 3127 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 3128
7996a778 3129 spin_lock_bh(&session->lock);
7996a778
MC		 3130 if (is_leading)
3131 session->leadconn = conn;
98644047 3132 spin_unlock_bh(&session->lock);
7996a778
MC		 3133
3134 /*
3135 * Unblock xmitworker(), Login Phase will pass through.
3136 */
3137 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3138 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3139 return 0;
3140}
3141EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3142
5700b1af
MC		 3143static int iscsi_switch_str_param(char **param, char *new_val_buf)
3144{
3145 char *new_val;
3146
3147 if (*param) {
3148 if (!strcmp(*param, new_val_buf))
3149 return 0;
3150 }
3151
3152 new_val = kstrdup(new_val_buf, GFP_NOIO);
3153 if (!new_val)
3154 return -ENOMEM;
3155
3156 kfree(*param);
3157 *param = new_val;
3158 return 0;
3159}
a54a52ca
MC		 3160
3161int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3162 enum iscsi_param param, char *buf, int buflen)
3163{
3164 struct iscsi_conn *conn = cls_conn->dd_data;
3165 struct iscsi_session *session = conn->session;
3166 uint32_t value;
3167
3168 switch(param) {
843c0a8a
MC		 3169 case ISCSI_PARAM_FAST_ABORT:
3170 sscanf(buf, "%d", &session->fast_abort);
3171 break;
f6d5180c
MC		 3172 case ISCSI_PARAM_ABORT_TMO:
3173 sscanf(buf, "%d", &session->abort_timeout);
3174 break;
3175 case ISCSI_PARAM_LU_RESET_TMO:
3176 sscanf(buf, "%d", &session->lu_reset_timeout);
3177 break;
3fe5ae8b
MC		 3178 case ISCSI_PARAM_TGT_RESET_TMO:
3179 sscanf(buf, "%d", &session->tgt_reset_timeout);
3180 break;
f6d5180c
MC		 3181 case ISCSI_PARAM_PING_TMO:
3182 sscanf(buf, "%d", &conn->ping_timeout);
3183 break;
3184 case ISCSI_PARAM_RECV_TMO:
3185 sscanf(buf, "%d", &conn->recv_timeout);
3186 break;
a54a52ca
MC		 3187 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3188 sscanf(buf, "%d", &conn->max_recv_dlength);
3189 break;
3190 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3191 sscanf(buf, "%d", &conn->max_xmit_dlength);
3192 break;
3193 case ISCSI_PARAM_HDRDGST_EN:
3194 sscanf(buf, "%d", &conn->hdrdgst_en);
3195 break;
3196 case ISCSI_PARAM_DATADGST_EN:
3197 sscanf(buf, "%d", &conn->datadgst_en);
3198 break;
3199 case ISCSI_PARAM_INITIAL_R2T_EN:
3200 sscanf(buf, "%d", &session->initial_r2t_en);
3201 break;
3202 case ISCSI_PARAM_MAX_R2T:
3203 sscanf(buf, "%d", &session->max_r2t);
3204 break;
3205 case ISCSI_PARAM_IMM_DATA_EN:
3206 sscanf(buf, "%d", &session->imm_data_en);
3207 break;
3208 case ISCSI_PARAM_FIRST_BURST:
3209 sscanf(buf, "%d", &session->first_burst);
3210 break;
3211 case ISCSI_PARAM_MAX_BURST:
3212 sscanf(buf, "%d", &session->max_burst);
3213 break;
3214 case ISCSI_PARAM_PDU_INORDER_EN:
3215 sscanf(buf, "%d", &session->pdu_inorder_en);
3216 break;
3217 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3218 sscanf(buf, "%d", &session->dataseq_inorder_en);
3219 break;
3220 case ISCSI_PARAM_ERL:
3221 sscanf(buf, "%d", &session->erl);
3222 break;
3223 case ISCSI_PARAM_IFMARKER_EN:
3224 sscanf(buf, "%d", &value);
3225 BUG_ON(value);
3226 break;
3227 case ISCSI_PARAM_OFMARKER_EN:
3228 sscanf(buf, "%d", &value);
3229 BUG_ON(value);
3230 break;
3231 case ISCSI_PARAM_EXP_STATSN:
3232 sscanf(buf, "%u", &conn->exp_statsn);
3233 break;
b2c64167 3234 case ISCSI_PARAM_USERNAME:
5700b1af 3235 return iscsi_switch_str_param(&session->username, buf);
b2c64167 3236 case ISCSI_PARAM_USERNAME_IN:
5700b1af 3237 return iscsi_switch_str_param(&session->username_in, buf);
b2c64167 3238 case ISCSI_PARAM_PASSWORD:
5700b1af 3239 return iscsi_switch_str_param(&session->password, buf);
b2c64167 3240 case ISCSI_PARAM_PASSWORD_IN:
5700b1af 3241 return iscsi_switch_str_param(&session->password_in, buf);
a54a52ca 3242 case ISCSI_PARAM_TARGET_NAME:
5700b1af 3243 return iscsi_switch_str_param(&session->targetname, buf);
a54a52ca
MC		 3244 case ISCSI_PARAM_TPGT:
3245 sscanf(buf, "%d", &session->tpgt);
3246 break;
3247 case ISCSI_PARAM_PERSISTENT_PORT:
3248 sscanf(buf, "%d", &conn->persistent_port);
3249 break;
3250 case ISCSI_PARAM_PERSISTENT_ADDRESS:
5700b1af 3251 return iscsi_switch_str_param(&conn->persistent_address, buf);
88dfd340 3252 case ISCSI_PARAM_IFACE_NAME:
5700b1af 3253 return iscsi_switch_str_param(&session->ifacename, buf);
88dfd340 3254 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3255 return iscsi_switch_str_param(&session->initiatorname, buf);
a54a52ca
MC		 3256 default:
3257 return -ENOSYS;
3258 }
3259
3260 return 0;
3261}
3262EXPORT_SYMBOL_GPL(iscsi_set_param);
3263
3264int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3265 enum iscsi_param param, char *buf)
3266{
75613521 3267 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 3268 int len;
3269
3270 switch(param) {
843c0a8a
MC		 3271 case ISCSI_PARAM_FAST_ABORT:
3272 len = sprintf(buf, "%d\n", session->fast_abort);
3273 break;
f6d5180c
MC		 3274 case ISCSI_PARAM_ABORT_TMO:
3275 len = sprintf(buf, "%d\n", session->abort_timeout);
3276 break;
3277 case ISCSI_PARAM_LU_RESET_TMO:
3278 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3279 break;
3fe5ae8b
MC		 3280 case ISCSI_PARAM_TGT_RESET_TMO:
3281 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3282 break;
a54a52ca
MC		 3283 case ISCSI_PARAM_INITIAL_R2T_EN:
3284 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3285 break;
3286 case ISCSI_PARAM_MAX_R2T:
3287 len = sprintf(buf, "%hu\n", session->max_r2t);
3288 break;
3289 case ISCSI_PARAM_IMM_DATA_EN:
3290 len = sprintf(buf, "%d\n", session->imm_data_en);
3291 break;
3292 case ISCSI_PARAM_FIRST_BURST:
3293 len = sprintf(buf, "%u\n", session->first_burst);
3294 break;
3295 case ISCSI_PARAM_MAX_BURST:
3296 len = sprintf(buf, "%u\n", session->max_burst);
3297 break;
3298 case ISCSI_PARAM_PDU_INORDER_EN:
3299 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3300 break;
3301 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3302 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3303 break;
3304 case ISCSI_PARAM_ERL:
3305 len = sprintf(buf, "%d\n", session->erl);
3306 break;
3307 case ISCSI_PARAM_TARGET_NAME:
3308 len = sprintf(buf, "%s\n", session->targetname);
3309 break;
3310 case ISCSI_PARAM_TPGT:
3311 len = sprintf(buf, "%d\n", session->tpgt);
3312 break;
b2c64167
MC		 3313 case ISCSI_PARAM_USERNAME:
3314 len = sprintf(buf, "%s\n", session->username);
3315 break;
3316 case ISCSI_PARAM_USERNAME_IN:
3317 len = sprintf(buf, "%s\n", session->username_in);
3318 break;
3319 case ISCSI_PARAM_PASSWORD:
3320 len = sprintf(buf, "%s\n", session->password);
3321 break;
3322 case ISCSI_PARAM_PASSWORD_IN:
3323 len = sprintf(buf, "%s\n", session->password_in);
3324 break;
88dfd340
MC		 3325 case ISCSI_PARAM_IFACE_NAME:
3326 len = sprintf(buf, "%s\n", session->ifacename);
3327 break;
3328 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3329 len = sprintf(buf, "%s\n", session->initiatorname);
88dfd340 3330 break;
a54a52ca
MC		 3331 default:
3332 return -ENOSYS;
3333 }
3334
3335 return len;
3336}
3337EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3338
00f3708e
MC		 3339int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3340 enum iscsi_param param, char *buf)
3341{
3342 struct sockaddr_in6 *sin6 = NULL;
3343 struct sockaddr_in *sin = NULL;
3344 int len;
3345
3346 switch (addr->ss_family) {
3347 case AF_INET:
3348 sin = (struct sockaddr_in *)addr;
3349 break;
3350 case AF_INET6:
3351 sin6 = (struct sockaddr_in6 *)addr;
3352 break;
3353 default:
3354 return -EINVAL;
3355 }
3356
3357 switch (param) {
3358 case ISCSI_PARAM_CONN_ADDRESS:
3359 case ISCSI_HOST_PARAM_IPADDRESS:
3360 if (sin)
3361 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3362 else
3363 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3364 break;
3365 case ISCSI_PARAM_CONN_PORT:
3366 if (sin)
3367 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3368 else
3369 len = sprintf(buf, "%hu\n",
3370 be16_to_cpu(sin6->sin6_port));
3371 break;
3372 default:
3373 return -EINVAL;
3374 }
3375
3376 return len;
3377}
3378EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3379
a54a52ca
MC		 3380int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3381 enum iscsi_param param, char *buf)
3382{
3383 struct iscsi_conn *conn = cls_conn->dd_data;
3384 int len;
3385
3386 switch(param) {
f6d5180c
MC		 3387 case ISCSI_PARAM_PING_TMO:
3388 len = sprintf(buf, "%u\n", conn->ping_timeout);
3389 break;
3390 case ISCSI_PARAM_RECV_TMO:
3391 len = sprintf(buf, "%u\n", conn->recv_timeout);
3392 break;
a54a52ca
MC		 3393 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3394 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3395 break;
3396 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3397 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3398 break;
3399 case ISCSI_PARAM_HDRDGST_EN:
3400 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3401 break;
3402 case ISCSI_PARAM_DATADGST_EN:
3403 len = sprintf(buf, "%d\n", conn->datadgst_en);
3404 break;
3405 case ISCSI_PARAM_IFMARKER_EN:
3406 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3407 break;
3408 case ISCSI_PARAM_OFMARKER_EN:
3409 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3410 break;
3411 case ISCSI_PARAM_EXP_STATSN:
3412 len = sprintf(buf, "%u\n", conn->exp_statsn);
3413 break;
3414 case ISCSI_PARAM_PERSISTENT_PORT:
3415 len = sprintf(buf, "%d\n", conn->persistent_port);
3416 break;
3417 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3418 len = sprintf(buf, "%s\n", conn->persistent_address);
3419 break;
3420 default:
3421 return -ENOSYS;
3422 }
3423
3424 return len;
3425}
3426EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3427
0801c242
MC		 3428int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3429 char *buf)
3430{
75613521 3431 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3432 int len;
3433
3434 switch (param) {
d8196ed2 3435 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3436 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 3437 break;
0801c242 3438 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3439 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 3440 break;
8ad5781a 3441 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3442 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 3443 break;
0801c242
MC		 3444 default:
3445 return -ENOSYS;
3446 }
3447
3448 return len;
3449}
3450EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3451
3452int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3453 char *buf, int buflen)
3454{
75613521 3455 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3456
3457 switch (param) {
d8196ed2 3458 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3459 return iscsi_switch_str_param(&ihost->netdev, buf);
0801c242 3460 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3461 return iscsi_switch_str_param(&ihost->hwaddress, buf);
8ad5781a 3462 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3463 return iscsi_switch_str_param(&ihost->initiatorname, buf);
0801c242
MC		 3464 default:
3465 return -ENOSYS;
3466 }
3467
3468 return 0;
3469}
3470EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3471
7996a778
MC		 3472MODULE_AUTHOR("Mike Christie");
3473MODULE_DESCRIPTION("iSCSI library functions");
3474MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)