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[SCSI] pm8001: add SAS/SATA HBA driver
[net-next-2.6.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>
8eb00539 28#include <asm/unaligned.h>
7996a778
MC		 29#include <net/tcp.h>
30#include <scsi/scsi_cmnd.h>
31#include <scsi/scsi_device.h>
32#include <scsi/scsi_eh.h>
33#include <scsi/scsi_tcq.h>
34#include <scsi/scsi_host.h>
35#include <scsi/scsi.h>
36#include <scsi/iscsi_proto.h>
37#include <scsi/scsi_transport.h>
38#include <scsi/scsi_transport_iscsi.h>
39#include <scsi/libiscsi.h>
40
bd2199d4
EZ		 41static int iscsi_dbg_lib_conn;
42module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
43 S_IRUGO | S_IWUSR);
44MODULE_PARM_DESC(debug_libiscsi_conn,
45 "Turn on debugging for connections in libiscsi module. "
46 "Set to 1 to turn on, and zero to turn off. Default is off.");
47
48static int iscsi_dbg_lib_session;
49module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
50 S_IRUGO | S_IWUSR);
51MODULE_PARM_DESC(debug_libiscsi_session,
52 "Turn on debugging for sessions in libiscsi module. "
53 "Set to 1 to turn on, and zero to turn off. Default is off.");
54
55static int iscsi_dbg_lib_eh;
56module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
57 S_IRUGO | S_IWUSR);
58MODULE_PARM_DESC(debug_libiscsi_eh,
59 "Turn on debugging for error handling in libiscsi module. "
60 "Set to 1 to turn on, and zero to turn off. Default is off.");
1b2c7af8
MC		 61
62#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
63 do { \
bd2199d4 64 if (iscsi_dbg_lib_conn) \
1b2c7af8
MC		 65 iscsi_conn_printk(KERN_INFO, _conn, \
66 "%s " dbg_fmt, \
67 __func__, ##arg); \
68 } while (0);
69
70#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
71 do { \
bd2199d4
EZ		 72 if (iscsi_dbg_lib_session) \
73 iscsi_session_printk(KERN_INFO, _session, \
74 "%s " dbg_fmt, \
75 __func__, ##arg); \
76 } while (0);
77
78#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
79 do { \
80 if (iscsi_dbg_lib_eh) \
1b2c7af8
MC		 81 iscsi_session_printk(KERN_INFO, _session, \
82 "%s " dbg_fmt, \
83 __func__, ##arg); \
84 } while (0);
85
77a23c21
MC		 86/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
87#define SNA32_CHECK 2147483648UL
7996a778 88
77a23c21
MC		 89static int iscsi_sna_lt(u32 n1, u32 n2)
90{
91 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
92 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
93}
94
95/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
96static int iscsi_sna_lte(u32 n1, u32 n2)
97{
98 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
99 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
100}
101
32ae763e
MC		 102inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
103{
104 struct Scsi_Host *shost = conn->session->host;
105 struct iscsi_host *ihost = shost_priv(shost);
106
1336aed1
MC		 107 if (ihost->workq)
108 queue_work(ihost->workq, &conn->xmitwork);
32ae763e
MC		 109}
110EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
111
4c0ba5d2
MC		 112static void __iscsi_update_cmdsn(struct iscsi_session *session,
113 uint32_t exp_cmdsn, uint32_t max_cmdsn)
7996a778 114{
77a23c21
MC		 115 /*
116 * standard specifies this check for when to update expected and
117 * max sequence numbers
118 */
119 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
120 return;
121
122 if (exp_cmdsn != session->exp_cmdsn &&
123 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 124 session->exp_cmdsn = exp_cmdsn;
125
77a23c21
MC		 126 if (max_cmdsn != session->max_cmdsn &&
127 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
128 session->max_cmdsn = max_cmdsn;
129 /*
130 * if the window closed with IO queued, then kick the
131 * xmit thread
132 */
3bbaaad9 133 if (!list_empty(&session->leadconn->cmdqueue) ||
1336aed1
MC		 134 !list_empty(&session->leadconn->mgmtqueue))
135 iscsi_conn_queue_work(session->leadconn);
77a23c21 136 }
7996a778 137}
4c0ba5d2
MC		 138
139void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
140{
141 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
142 be32_to_cpu(hdr->max_cmdsn));
143}
77a23c21 144EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 145
577577da
MC		 146/**
147 * iscsi_prep_data_out_pdu - initialize Data-Out
148 * @task: scsi command task
149 * @r2t: R2T info
150 * @hdr: iscsi data in pdu
151 *
152 * Notes:
153 * Initialize Data-Out within this R2T sequence and finds
154 * proper data_offset within this SCSI command.
155 *
156 * This function is called with connection lock taken.
157 **/
158void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
159 struct iscsi_data *hdr)
7996a778 160{
9c19a7d0 161 struct iscsi_conn *conn = task->conn;
577577da
MC		 162 unsigned int left = r2t->data_length - r2t->sent;
163
164 task->hdr_len = sizeof(struct iscsi_data);
7996a778
MC		 165
166 memset(hdr, 0, sizeof(struct iscsi_data));
577577da
MC		 167 hdr->ttt = r2t->ttt;
168 hdr->datasn = cpu_to_be32(r2t->datasn);
169 r2t->datasn++;
7996a778 170 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
577577da
MC		 171 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
172 hdr->itt = task->hdr_itt;
173 hdr->exp_statsn = r2t->exp_statsn;
174 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
175 if (left > conn->max_xmit_dlength) {
7996a778 176 hton24(hdr->dlength, conn->max_xmit_dlength);
577577da 177 r2t->data_count = conn->max_xmit_dlength;
7996a778
MC		 178 hdr->flags = 0;
179 } else {
577577da
MC		 180 hton24(hdr->dlength, left);
181 r2t->data_count = left;
7996a778
MC		 182 hdr->flags = ISCSI_FLAG_CMD_FINAL;
183 }
577577da 184 conn->dataout_pdus_cnt++;
7996a778 185}
577577da 186EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
7996a778 187
9c19a7d0 188static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 189{
9c19a7d0 190 unsigned exp_len = task->hdr_len + len;
004d6530 191
9c19a7d0 192 if (exp_len > task->hdr_max) {
004d6530
BH		 193 WARN_ON(1);
194 return -EINVAL;
195 }
196
197 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 198 task->hdr_len = exp_len;
004d6530
BH		 199 return 0;
200}
201
38d1c069
BH		 202/*
203 * make an extended cdb AHS
204 */
9c19a7d0 205static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 206{
9c19a7d0 207 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 208 unsigned rlen, pad_len;
209 unsigned short ahslength;
210 struct iscsi_ecdb_ahdr *ecdb_ahdr;
211 int rc;
212
9c19a7d0 213 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 214 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
215
216 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
217 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
218
219 pad_len = iscsi_padding(rlen);
220
9c19a7d0 221 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 222 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
223 if (rc)
224 return rc;
225
226 if (pad_len)
227 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
228
229 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
230 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
231 ecdb_ahdr->reserved = 0;
232 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
233
1b2c7af8
MC		 234 ISCSI_DBG_SESSION(task->conn->session,
235 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
236 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
237 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
238 task->hdr_len);
38d1c069
BH		 239 return 0;
240}
241
9c19a7d0 242static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
c07d4444 243{
9c19a7d0 244 struct scsi_cmnd *sc = task->sc;
c07d4444
BH		 245 struct iscsi_rlength_ahdr *rlen_ahdr;
246 int rc;
247
9c19a7d0
MC		 248 rlen_ahdr = iscsi_next_hdr(task);
249 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
c07d4444
BH		 250 if (rc)
251 return rc;
252
253 rlen_ahdr->ahslength =
254 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
255 sizeof(rlen_ahdr->reserved));
256 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
257 rlen_ahdr->reserved = 0;
258 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
259
1b2c7af8
MC		 260 ISCSI_DBG_SESSION(task->conn->session,
261 "bidi-in rlen_ahdr->read_length(%d) "
262 "rlen_ahdr->ahslength(%d)\n",
263 be32_to_cpu(rlen_ahdr->read_length),
264 be16_to_cpu(rlen_ahdr->ahslength));
c07d4444
BH		 265 return 0;
266}
267
7996a778
MC		 268/**
269 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 270 * @task: iscsi task
7996a778
MC		 271 *
272 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
273 * fields like dlength or final based on how much data it sends
274 */
9c19a7d0 275static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 276{
9c19a7d0 277 struct iscsi_conn *conn = task->conn;
7996a778 278 struct iscsi_session *session = conn->session;
9c19a7d0 279 struct scsi_cmnd *sc = task->sc;
577577da 280 struct iscsi_cmd *hdr;
38d1c069 281 unsigned hdrlength, cmd_len;
262ef636 282 itt_t itt;
004d6530 283 int rc;
7996a778 284
184b57c6
MC		 285 if (conn->session->tt->alloc_pdu) {
286 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
287 if (rc)
288 return rc;
289 }
577577da 290 hdr = (struct iscsi_cmd *) task->hdr;
262ef636 291 itt = hdr->itt;
577577da
MC		 292 memset(hdr, 0, sizeof(*hdr));
293
2ff79d52
MC		 294 if (session->tt->parse_pdu_itt)
295 hdr->itt = task->hdr_itt = itt;
296 else
297 hdr->itt = task->hdr_itt = build_itt(task->itt,
298 task->conn->session->age);
9c19a7d0
MC		 299 task->hdr_len = 0;
300 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 301 if (rc)
302 return rc;
a8ac6311
OK		 303 hdr->opcode = ISCSI_OP_SCSI_CMD;
304 hdr->flags = ISCSI_ATTR_SIMPLE;
305 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
577577da 306 memcpy(task->lun, hdr->lun, sizeof(task->lun));
a8ac6311 307 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 308 cmd_len = sc->cmd_len;
309 if (cmd_len < ISCSI_CDB_SIZE)
310 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
311 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 312 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 313 if (rc)
314 return rc;
315 cmd_len = ISCSI_CDB_SIZE;
316 }
317 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 318
9c19a7d0 319 task->imm_count = 0;
c07d4444
BH		 320 if (scsi_bidi_cmnd(sc)) {
321 hdr->flags |= ISCSI_FLAG_CMD_READ;
9c19a7d0 322 rc = iscsi_prep_bidi_ahs(task);
c07d4444
BH		 323 if (rc)
324 return rc;
325 }
7996a778 326 if (sc->sc_data_direction == DMA_TO_DEVICE) {
c07d4444 327 unsigned out_len = scsi_out(sc)->length;
577577da
MC		 328 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
329
c07d4444 330 hdr->data_length = cpu_to_be32(out_len);
7996a778
MC		 331 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
332 /*
333 * Write counters:
334 *
335 * imm_count bytes to be sent right after
336 * SCSI PDU Header
337 *
338 * unsol_count bytes(as Data-Out) to be sent
339 * without R2T ack right after
340 * immediate data
341 *
577577da 342 * r2t data_length bytes to be sent via R2T ack's
7996a778
MC		 343 *
344 * pad_count bytes to be sent as zero-padding
345 */
577577da 346 memset(r2t, 0, sizeof(*r2t));
7996a778
MC		 347
348 if (session->imm_data_en) {
c07d4444 349 if (out_len >= session->first_burst)
9c19a7d0 350 task->imm_count = min(session->first_burst,
7996a778
MC		 351 conn->max_xmit_dlength);
352 else
9c19a7d0 353 task->imm_count = min(out_len,
7996a778 354 conn->max_xmit_dlength);
9c19a7d0 355 hton24(hdr->dlength, task->imm_count);
7996a778 356 } else
a8ac6311 357 zero_data(hdr->dlength);
7996a778 358
ffd0436e 359 if (!session->initial_r2t_en) {
577577da
MC		 360 r2t->data_length = min(session->first_burst, out_len) -
361 task->imm_count;
362 r2t->data_offset = task->imm_count;
363 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
364 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e
MC		 365 }
366
577577da 367 if (!task->unsol_r2t.data_length)
7996a778 368 /* No unsolicit Data-Out's */
a8ac6311 369 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 370 } else {
7996a778
MC		 371 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
372 zero_data(hdr->dlength);
c07d4444 373 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
7996a778
MC		 374
375 if (sc->sc_data_direction == DMA_FROM_DEVICE)
376 hdr->flags |= ISCSI_FLAG_CMD_READ;
377 }
378
004d6530 379 /* calculate size of additional header segments (AHSs) */
9c19a7d0 380 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 381
382 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
383 hdrlength /= ISCSI_PAD_LEN;
384
385 WARN_ON(hdrlength >= 256);
386 hdr->hlength = hdrlength & 0xFF;
387
577577da 388 if (session->tt->init_task && session->tt->init_task(task))
052d0144
MC		 389 return -EIO;
390
9c19a7d0 391 task->state = ISCSI_TASK_RUNNING;
d3305f34
MC		 392 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
393 session->cmdsn++;
77a23c21 394
a8ac6311 395 conn->scsicmd_pdus_cnt++;
1b2c7af8
MC		 396 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
397 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
398 scsi_bidi_cmnd(sc) ? "bidirectional" :
399 sc->sc_data_direction == DMA_TO_DEVICE ?
400 "write" : "read", conn->id, sc, sc->cmnd[0],
401 task->itt, scsi_bufflen(sc),
402 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
403 session->cmdsn,
404 session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 405 return 0;
7996a778 406}
7996a778
MC		 407
408/**
3bbaaad9 409 * iscsi_free_task - free a task
9c19a7d0 410 * @task: iscsi cmd task
7996a778
MC		 411 *
412 * Must be called with session lock.
3e5c28ad
MC		 413 * This function returns the scsi command to scsi-ml or cleans
414 * up mgmt tasks then returns the task to the pool.
7996a778 415 */
3bbaaad9 416static void iscsi_free_task(struct iscsi_task *task)
7996a778 417{
9c19a7d0 418 struct iscsi_conn *conn = task->conn;
c1635cb7 419 struct iscsi_session *session = conn->session;
9c19a7d0 420 struct scsi_cmnd *sc = task->sc;
7996a778 421
4421c9eb
MC		 422 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
423 task->itt, task->state, task->sc);
424
577577da 425 session->tt->cleanup_task(task);
3bbaaad9 426 task->state = ISCSI_TASK_FREE;
9c19a7d0 427 task->sc = NULL;
3e5c28ad 428 /*
9c19a7d0 429 * login task is preallocated so do not free
3e5c28ad 430 */
9c19a7d0 431 if (conn->login_task == task)
3e5c28ad
MC		 432 return;
433
9c19a7d0 434 __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 435
3e5c28ad 436 if (sc) {
9c19a7d0 437 task->sc = NULL;
3e5c28ad
MC		 438 /* SCSI eh reuses commands to verify us */
439 sc->SCp.ptr = NULL;
440 /*
441 * queue command may call this to free the task, but
442 * not have setup the sc callback
443 */
444 if (sc->scsi_done)
445 sc->scsi_done(sc);
446 }
7996a778
MC		 447}
448
913e5bf4 449void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 450{
9c19a7d0 451 atomic_inc(&task->refcount);
60ecebf5 452}
913e5bf4 453EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 454
9c19a7d0 455static void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 456{
9c19a7d0 457 if (atomic_dec_and_test(&task->refcount))
3bbaaad9 458 iscsi_free_task(task);
60ecebf5
MC		 459}
460
9c19a7d0 461void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 462{
9c19a7d0 463 struct iscsi_session *session = task->conn->session;
3e5c28ad
MC		 464
465 spin_lock_bh(&session->lock);
9c19a7d0 466 __iscsi_put_task(task);
3e5c28ad
MC		 467 spin_unlock_bh(&session->lock);
468}
9c19a7d0 469EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 470
3bbaaad9
MC		 471/**
472 * iscsi_complete_task - finish a task
473 * @task: iscsi cmd task
b3cd5050 474 * @state: state to complete task with
3bbaaad9
MC		 475 *
476 * Must be called with session lock.
477 */
b3cd5050 478static void iscsi_complete_task(struct iscsi_task *task, int state)
3bbaaad9
MC		 479{
480 struct iscsi_conn *conn = task->conn;
481
4421c9eb
MC		 482 ISCSI_DBG_SESSION(conn->session,
483 "complete task itt 0x%x state %d sc %p\n",
484 task->itt, task->state, task->sc);
b3cd5050
MC		 485 if (task->state == ISCSI_TASK_COMPLETED ||
486 task->state == ISCSI_TASK_ABRT_TMF ||
487 task->state == ISCSI_TASK_ABRT_SESS_RECOV)
3bbaaad9
MC		 488 return;
489 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
b3cd5050 490 task->state = state;
3bbaaad9
MC		 491
492 if (!list_empty(&task->running))
493 list_del_init(&task->running);
494
495 if (conn->task == task)
496 conn->task = NULL;
497
498 if (conn->ping_task == task)
499 conn->ping_task = NULL;
500
501 /* release get from queueing */
502 __iscsi_put_task(task);
503}
504
4c0ba5d2
MC		 505/**
506 * iscsi_complete_scsi_task - finish scsi task normally
507 * @task: iscsi task for scsi cmd
508 * @exp_cmdsn: expected cmd sn in cpu format
509 * @max_cmdsn: max cmd sn in cpu format
510 *
511 * This is used when drivers do not need or cannot perform
512 * lower level pdu processing.
513 *
514 * Called with session lock
515 */
516void iscsi_complete_scsi_task(struct iscsi_task *task,
517 uint32_t exp_cmdsn, uint32_t max_cmdsn)
518{
519 struct iscsi_conn *conn = task->conn;
520
521 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
522
523 conn->last_recv = jiffies;
524 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
525 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
526}
527EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
528
529
b3a7ea8d 530/*
3bbaaad9
MC		 531 * session lock must be held and if not called for a task that is
532 * still pending or from the xmit thread, then xmit thread must
533 * be suspended.
b3a7ea8d 534 */
3bbaaad9 535static void fail_scsi_task(struct iscsi_task *task, int err)
b3a7ea8d 536{
3bbaaad9 537 struct iscsi_conn *conn = task->conn;
b3a7ea8d 538 struct scsi_cmnd *sc;
b3cd5050 539 int state;
b3a7ea8d 540
3bbaaad9
MC		 541 /*
542 * if a command completes and we get a successful tmf response
543 * we will hit this because the scsi eh abort code does not take
544 * a ref to the task.
545 */
9c19a7d0 546 sc = task->sc;
b3a7ea8d
MC		 547 if (!sc)
548 return;
549
b3cd5050 550 if (task->state == ISCSI_TASK_PENDING) {
b3a7ea8d
MC		 551 /*
552 * cmd never made it to the xmit thread, so we should not count
553 * the cmd in the sequencing
554 */
555 conn->session->queued_cmdsn--;
b3cd5050
MC		 556 /* it was never sent so just complete like normal */
557 state = ISCSI_TASK_COMPLETED;
558 } else if (err == DID_TRANSPORT_DISRUPTED)
559 state = ISCSI_TASK_ABRT_SESS_RECOV;
560 else
561 state = ISCSI_TASK_ABRT_TMF;
b3a7ea8d 562
b3cd5050 563 sc->result = err << 16;
c07d4444
BH		 564 if (!scsi_bidi_cmnd(sc))
565 scsi_set_resid(sc, scsi_bufflen(sc));
566 else {
567 scsi_out(sc)->resid = scsi_out(sc)->length;
568 scsi_in(sc)->resid = scsi_in(sc)->length;
569 }
3e5c28ad 570
b3cd5050 571 iscsi_complete_task(task, state);
b3a7ea8d
MC		 572}
573
3e5c28ad 574static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 575 struct iscsi_task *task)
052d0144
MC		 576{
577 struct iscsi_session *session = conn->session;
577577da 578 struct iscsi_hdr *hdr = task->hdr;
052d0144
MC		 579 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
580
581 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
582 return -ENOTCONN;
583
584 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
585 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
586 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
587 /*
588 * pre-format CmdSN for outgoing PDU.
589 */
590 nop->cmdsn = cpu_to_be32(session->cmdsn);
591 if (hdr->itt != RESERVED_ITT) {
052d0144
MC		 592 /*
593 * TODO: We always use immediate, so we never hit this.
594 * If we start to send tmfs or nops as non-immediate then
595 * we should start checking the cmdsn numbers for mgmt tasks.
596 */
597 if (conn->c_stage == ISCSI_CONN_STARTED &&
598 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
599 session->queued_cmdsn++;
600 session->cmdsn++;
601 }
602 }
603
ae15f801
MC		 604 if (session->tt->init_task && session->tt->init_task(task))
605 return -EIO;
052d0144
MC		 606
607 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
608 session->state = ISCSI_STATE_LOGGING_OUT;
609
577577da 610 task->state = ISCSI_TASK_RUNNING;
1b2c7af8
MC		 611 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
612 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
613 hdr->itt, task->data_count);
052d0144
MC		 614 return 0;
615}
616
9c19a7d0 617static struct iscsi_task *
f6d5180c
MC		 618__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
619 char *data, uint32_t data_size)
620{
621 struct iscsi_session *session = conn->session;
1336aed1 622 struct iscsi_host *ihost = shost_priv(session->host);
9c19a7d0 623 struct iscsi_task *task;
262ef636 624 itt_t itt;
f6d5180c
MC		 625
626 if (session->state == ISCSI_STATE_TERMINATE)
627 return NULL;
628
629 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
630 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
631 /*
632 * Login and Text are sent serially, in
633 * request-followed-by-response sequence.
3e5c28ad
MC		 634 * Same task can be used. Same ITT must be used.
635 * Note that login_task is preallocated at conn_create().
f6d5180c 636 */
9c19a7d0 637 task = conn->login_task;
f6d5180c 638 else {
26013ad4
MC		 639 if (session->state != ISCSI_STATE_LOGGED_IN)
640 return NULL;
641
f6d5180c
MC		 642 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
643 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
644
3e5c28ad 645 if (!__kfifo_get(session->cmdpool.queue,
9c19a7d0 646 (void*)&task, sizeof(void*)))
f6d5180c
MC		 647 return NULL;
648 }
3e5c28ad
MC		 649 /*
650 * released in complete pdu for task we expect a response for, and
651 * released by the lld when it has transmitted the task for
652 * pdus we do not expect a response for.
653 */
9c19a7d0
MC		 654 atomic_set(&task->refcount, 1);
655 task->conn = conn;
656 task->sc = NULL;
3bbaaad9
MC		 657 INIT_LIST_HEAD(&task->running);
658 task->state = ISCSI_TASK_PENDING;
f6d5180c
MC		 659
660 if (data_size) {
9c19a7d0
MC		 661 memcpy(task->data, data, data_size);
662 task->data_count = data_size;
f6d5180c 663 } else
9c19a7d0 664 task->data_count = 0;
f6d5180c 665
184b57c6
MC		 666 if (conn->session->tt->alloc_pdu) {
667 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
668 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
669 "pdu for mgmt task.\n");
3bbaaad9 670 goto free_task;
184b57c6 671 }
577577da 672 }
184b57c6 673
262ef636 674 itt = task->hdr->itt;
577577da 675 task->hdr_len = sizeof(struct iscsi_hdr);
9c19a7d0 676 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
262ef636
MC		 677
678 if (hdr->itt != RESERVED_ITT) {
679 if (session->tt->parse_pdu_itt)
680 task->hdr->itt = itt;
681 else
682 task->hdr->itt = build_itt(task->itt,
683 task->conn->session->age);
684 }
685
1336aed1 686 if (!ihost->workq) {
577577da
MC		 687 if (iscsi_prep_mgmt_task(conn, task))
688 goto free_task;
052d0144 689
9c19a7d0 690 if (session->tt->xmit_task(task))
577577da 691 goto free_task;
3bbaaad9
MC		 692 } else {
693 list_add_tail(&task->running, &conn->mgmtqueue);
32ae763e 694 iscsi_conn_queue_work(conn);
3bbaaad9 695 }
052d0144 696
9c19a7d0 697 return task;
577577da
MC		 698
699free_task:
700 __iscsi_put_task(task);
701 return NULL;
f6d5180c
MC		 702}
703
704int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
705 char *data, uint32_t data_size)
706{
707 struct iscsi_conn *conn = cls_conn->dd_data;
708 struct iscsi_session *session = conn->session;
709 int err = 0;
710
711 spin_lock_bh(&session->lock);
712 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
713 err = -EPERM;
714 spin_unlock_bh(&session->lock);
f6d5180c
MC		 715 return err;
716}
717EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
718
7996a778
MC		 719/**
720 * iscsi_cmd_rsp - SCSI Command Response processing
721 * @conn: iscsi connection
722 * @hdr: iscsi header
9c19a7d0 723 * @task: scsi command task
7996a778
MC		 724 * @data: cmd data buffer
725 * @datalen: len of buffer
726 *
727 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
9c19a7d0 728 * then completes the command and task.
7996a778 729 **/
77a23c21 730static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 731 struct iscsi_task *task, char *data,
77a23c21 732 int datalen)
7996a778 733{
7996a778
MC		 734 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
735 struct iscsi_session *session = conn->session;
9c19a7d0 736 struct scsi_cmnd *sc = task->sc;
7996a778 737
77a23c21 738 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 739 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
740
741 sc->result = (DID_OK << 16) | rhdr->cmd_status;
742
743 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
744 sc->result = DID_ERROR << 16;
745 goto out;
746 }
747
748 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 749 uint16_t senselen;
7996a778
MC		 750
751 if (datalen < 2) {
752invalid_datalen:
322d739d
MC		 753 iscsi_conn_printk(KERN_ERR, conn,
754 "Got CHECK_CONDITION but invalid data "
755 "buffer size of %d\n", datalen);
7996a778
MC		 756 sc->result = DID_BAD_TARGET << 16;
757 goto out;
758 }
759
8f333991 760 senselen = get_unaligned_be16(data);
7996a778
MC		 761 if (datalen < senselen)
762 goto invalid_datalen;
763
764 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 765 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
1b2c7af8
MC		 766 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
767 min_t(uint16_t, senselen,
768 SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 769 }
770
c07d4444
BH		 771 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
772 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
773 int res_count = be32_to_cpu(rhdr->bi_residual_count);
774
775 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
776 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
777 res_count <= scsi_in(sc)->length))
778 scsi_in(sc)->resid = res_count;
779 else
780 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
781 }
782
7207fea4
BH		 783 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
784 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 785 int res_count = be32_to_cpu(rhdr->residual_count);
786
7207fea4
BH		 787 if (res_count > 0 &&
788 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
789 res_count <= scsi_bufflen(sc)))
c07d4444 790 /* write side for bidi or uni-io set_resid */
1c138991 791 scsi_set_resid(sc, res_count);
7996a778
MC		 792 else
793 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 794 }
7996a778 795out:
3bbaaad9 796 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
1b2c7af8 797 sc, sc->result, task->itt);
7996a778 798 conn->scsirsp_pdus_cnt++;
b3cd5050 799 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 800}
801
1d9edf02
MC		 802/**
803 * iscsi_data_in_rsp - SCSI Data-In Response processing
804 * @conn: iscsi connection
805 * @hdr: iscsi pdu
806 * @task: scsi command task
807 **/
808static void
809iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
810 struct iscsi_task *task)
811{
812 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
813 struct scsi_cmnd *sc = task->sc;
814
815 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
816 return;
817
edbc9aa0 818 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
1d9edf02
MC		 819 sc->result = (DID_OK << 16) | rhdr->cmd_status;
820 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
821 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
822 ISCSI_FLAG_DATA_OVERFLOW)) {
823 int res_count = be32_to_cpu(rhdr->residual_count);
824
825 if (res_count > 0 &&
826 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
827 res_count <= scsi_in(sc)->length))
828 scsi_in(sc)->resid = res_count;
829 else
830 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
831 }
832
3bbaaad9
MC		 833 ISCSI_DBG_SESSION(conn->session, "data in with status done "
834 "[sc %p res %d itt 0x%x]\n",
835 sc, sc->result, task->itt);
1d9edf02 836 conn->scsirsp_pdus_cnt++;
b3cd5050 837 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1d9edf02
MC		 838}
839
7ea8b828
MC		 840static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
841{
842 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
843
844 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
845 conn->tmfrsp_pdus_cnt++;
846
843c0a8a 847 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 848 return;
849
850 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 851 conn->tmf_state = TMF_SUCCESS;
7ea8b828 852 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 853 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 854 else
843c0a8a 855 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 856 wake_up(&conn->ehwait);
857}
858
f6d5180c
MC		 859static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
860{
861 struct iscsi_nopout hdr;
9c19a7d0 862 struct iscsi_task *task;
f6d5180c 863
9c19a7d0 864 if (!rhdr && conn->ping_task)
f6d5180c
MC		 865 return;
866
867 memset(&hdr, 0, sizeof(struct iscsi_nopout));
868 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
869 hdr.flags = ISCSI_FLAG_CMD_FINAL;
870
871 if (rhdr) {
872 memcpy(hdr.lun, rhdr->lun, 8);
873 hdr.ttt = rhdr->ttt;
874 hdr.itt = RESERVED_ITT;
875 } else
876 hdr.ttt = RESERVED_ITT;
877
9c19a7d0
MC		 878 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
879 if (!task)
322d739d 880 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
d3acf022
MC		 881 else if (!rhdr) {
882 /* only track our nops */
883 conn->ping_task = task;
884 conn->last_ping = jiffies;
885 }
f6d5180c
MC		 886}
887
8afa1439
MC		 888static int iscsi_nop_out_rsp(struct iscsi_task *task,
889 struct iscsi_nopin *nop, char *data, int datalen)
890{
891 struct iscsi_conn *conn = task->conn;
892 int rc = 0;
893
894 if (conn->ping_task != task) {
895 /*
896 * If this is not in response to one of our
897 * nops then it must be from userspace.
898 */
899 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
900 data, datalen))
901 rc = ISCSI_ERR_CONN_FAILED;
902 } else
903 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
904 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
905 return rc;
906}
907
62f38300
MC		 908static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
909 char *data, int datalen)
910{
911 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
912 struct iscsi_hdr rejected_pdu;
8afa1439 913 int opcode, rc = 0;
62f38300
MC		 914
915 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
916
8afa1439
MC		 917 if (ntoh24(reject->dlength) > datalen ||
918 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
919 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
920 "pdu. Invalid data length (pdu dlength "
921 "%u, datalen %d\n", ntoh24(reject->dlength),
922 datalen);
923 return ISCSI_ERR_PROTO;
924 }
925 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
926 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
927
928 switch (reject->reason) {
929 case ISCSI_REASON_DATA_DIGEST_ERROR:
930 iscsi_conn_printk(KERN_ERR, conn,
931 "pdu (op 0x%x itt 0x%x) rejected "
932 "due to DataDigest error.\n",
933 rejected_pdu.itt, opcode);
934 break;
935 case ISCSI_REASON_IMM_CMD_REJECT:
936 iscsi_conn_printk(KERN_ERR, conn,
937 "pdu (op 0x%x itt 0x%x) rejected. Too many "
938 "immediate commands.\n",
939 rejected_pdu.itt, opcode);
940 /*
941 * We only send one TMF at a time so if the target could not
942 * handle it, then it should get fixed (RFC mandates that
943 * a target can handle one immediate TMF per conn).
944 *
945 * For nops-outs, we could have sent more than one if
946 * the target is sending us lots of nop-ins
947 */
948 if (opcode != ISCSI_OP_NOOP_OUT)
949 return 0;
62f38300 950
8afa1439
MC		 951 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
952 /*
953 * nop-out in response to target's nop-out rejected.
954 * Just resend.
955 */
956 iscsi_send_nopout(conn,
957 (struct iscsi_nopin*)&rejected_pdu);
958 else {
959 struct iscsi_task *task;
960 /*
961 * Our nop as ping got dropped. We know the target
962 * and transport are ok so just clean up
963 */
964 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
965 if (!task) {
966 iscsi_conn_printk(KERN_ERR, conn,
967 "Invalid pdu reject. Could "
968 "not lookup rejected task.\n");
969 rc = ISCSI_ERR_BAD_ITT;
970 } else
971 rc = iscsi_nop_out_rsp(task,
972 (struct iscsi_nopin*)&rejected_pdu,
973 NULL, 0);
62f38300 974 }
8afa1439
MC		 975 break;
976 default:
977 iscsi_conn_printk(KERN_ERR, conn,
978 "pdu (op 0x%x itt 0x%x) rejected. Reason "
979 "code 0x%x\n", rejected_pdu.itt,
980 rejected_pdu.opcode, reject->reason);
981 break;
62f38300 982 }
8afa1439 983 return rc;
62f38300
MC		 984}
985
913e5bf4
MC		 986/**
987 * iscsi_itt_to_task - look up task by itt
988 * @conn: iscsi connection
989 * @itt: itt
990 *
991 * This should be used for mgmt tasks like login and nops, or if
992 * the LDD's itt space does not include the session age.
993 *
994 * The session lock must be held.
995 */
8f9256ce 996struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
913e5bf4
MC		 997{
998 struct iscsi_session *session = conn->session;
262ef636 999 int i;
913e5bf4
MC		 1000
1001 if (itt == RESERVED_ITT)
1002 return NULL;
1003
262ef636
MC		 1004 if (session->tt->parse_pdu_itt)
1005 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1006 else
1007 i = get_itt(itt);
913e5bf4
MC		 1008 if (i >= session->cmds_max)
1009 return NULL;
1010
1011 return session->cmds[i];
1012}
8f9256ce 1013EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
913e5bf4 1014
7996a778
MC		 1015/**
1016 * __iscsi_complete_pdu - complete pdu
1017 * @conn: iscsi conn
1018 * @hdr: iscsi header
1019 * @data: data buffer
1020 * @datalen: len of data buffer
1021 *
1022 * Completes pdu processing by freeing any resources allocated at
1023 * queuecommand or send generic. session lock must be held and verify
1024 * itt must have been called.
1025 */
913e5bf4
MC		 1026int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1027 char *data, int datalen)
7996a778
MC		 1028{
1029 struct iscsi_session *session = conn->session;
1030 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 1031 struct iscsi_task *task;
7996a778
MC		 1032 uint32_t itt;
1033
f6d5180c 1034 conn->last_recv = jiffies;
0af967f5
MC		 1035 rc = iscsi_verify_itt(conn, hdr->itt);
1036 if (rc)
1037 return rc;
1038
b4377356
AV		 1039 if (hdr->itt != RESERVED_ITT)
1040 itt = get_itt(hdr->itt);
7996a778 1041 else
b4377356 1042 itt = ~0U;
7996a778 1043
1b2c7af8
MC		 1044 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1045 opcode, conn->id, itt, datalen);
7996a778 1046
3e5c28ad 1047 if (itt == ~0U) {
77a23c21 1048 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 1049
7996a778
MC		 1050 switch(opcode) {
1051 case ISCSI_OP_NOOP_IN:
40527afe 1052 if (datalen) {
7996a778 1053 rc = ISCSI_ERR_PROTO;
40527afe
MC		 1054 break;
1055 }
1056
b4377356 1057 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 1058 break;
1059
f6d5180c 1060 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 1061 break;
1062 case ISCSI_OP_REJECT:
62f38300
MC		 1063 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1064 break;
7996a778 1065 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 1066 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 1067 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1068 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 1069 break;
1070 default:
1071 rc = ISCSI_ERR_BAD_OPCODE;
1072 break;
1073 }
3e5c28ad
MC		 1074 goto out;
1075 }
1076
3e5c28ad
MC		 1077 switch(opcode) {
1078 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 1079 case ISCSI_OP_SCSI_DATA_IN:
1080 task = iscsi_itt_to_ctask(conn, hdr->itt);
1081 if (!task)
1082 return ISCSI_ERR_BAD_ITT;
d355e57d 1083 task->last_xfer = jiffies;
913e5bf4
MC		 1084 break;
1085 case ISCSI_OP_R2T:
1086 /*
1087 * LLD handles R2Ts if they need to.
1088 */
1089 return 0;
1090 case ISCSI_OP_LOGOUT_RSP:
1091 case ISCSI_OP_LOGIN_RSP:
1092 case ISCSI_OP_TEXT_RSP:
1093 case ISCSI_OP_SCSI_TMFUNC_RSP:
1094 case ISCSI_OP_NOOP_IN:
1095 task = iscsi_itt_to_task(conn, hdr->itt);
1096 if (!task)
1097 return ISCSI_ERR_BAD_ITT;
1098 break;
1099 default:
1100 return ISCSI_ERR_BAD_OPCODE;
1101 }
1102
1103 switch(opcode) {
1104 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 1105 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 1106 break;
1107 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 1108 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 1109 break;
3e5c28ad
MC		 1110 case ISCSI_OP_LOGOUT_RSP:
1111 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1112 if (datalen) {
1113 rc = ISCSI_ERR_PROTO;
1114 break;
1115 }
1116 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1117 goto recv_pdu;
1118 case ISCSI_OP_LOGIN_RSP:
1119 case ISCSI_OP_TEXT_RSP:
1120 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1121 /*
1122 * login related PDU's exp_statsn is handled in
1123 * userspace
1124 */
1125 goto recv_pdu;
1126 case ISCSI_OP_SCSI_TMFUNC_RSP:
1127 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1128 if (datalen) {
1129 rc = ISCSI_ERR_PROTO;
1130 break;
1131 }
1132
1133 iscsi_tmf_rsp(conn, hdr);
b3cd5050 1134 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
3e5c28ad
MC		 1135 break;
1136 case ISCSI_OP_NOOP_IN:
1137 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1138 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1139 rc = ISCSI_ERR_PROTO;
1140 break;
1141 }
1142 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1143
8afa1439
MC		 1144 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1145 data, datalen);
3e5c28ad
MC		 1146 break;
1147 default:
1148 rc = ISCSI_ERR_BAD_OPCODE;
1149 break;
1150 }
7996a778 1151
3e5c28ad
MC		 1152out:
1153 return rc;
1154recv_pdu:
1155 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1156 rc = ISCSI_ERR_CONN_FAILED;
b3cd5050 1157 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1158 return rc;
1159}
913e5bf4 1160EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 1161
1162int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1163 char *data, int datalen)
1164{
1165 int rc;
1166
1167 spin_lock(&conn->session->lock);
1168 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1169 spin_unlock(&conn->session->lock);
1170 return rc;
1171}
1172EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1173
0af967f5 1174int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 1175{
1176 struct iscsi_session *session = conn->session;
262ef636 1177 int age = 0, i = 0;
7996a778 1178
0af967f5
MC		 1179 if (itt == RESERVED_ITT)
1180 return 0;
7996a778 1181
262ef636
MC		 1182 if (session->tt->parse_pdu_itt)
1183 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1184 else {
1185 i = get_itt(itt);
1186 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1187 }
1188
1189 if (age != session->age) {
0af967f5
MC		 1190 iscsi_conn_printk(KERN_ERR, conn,
1191 "received itt %x expected session age (%x)\n",
913e5bf4 1192 (__force u32)itt, session->age);
0af967f5
MC		 1193 return ISCSI_ERR_BAD_ITT;
1194 }
7996a778 1195
3e5c28ad
MC		 1196 if (i >= session->cmds_max) {
1197 iscsi_conn_printk(KERN_ERR, conn,
1198 "received invalid itt index %u (max cmds "
1199 "%u.\n", i, session->cmds_max);
1200 return ISCSI_ERR_BAD_ITT;
7996a778 1201 }
7996a778
MC		 1202 return 0;
1203}
1204EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1205
913e5bf4
MC		 1206/**
1207 * iscsi_itt_to_ctask - look up ctask by itt
1208 * @conn: iscsi connection
1209 * @itt: itt
1210 *
1211 * This should be used for cmd tasks.
1212 *
1213 * The session lock must be held.
1214 */
1215struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 1216{
9c19a7d0 1217 struct iscsi_task *task;
0af967f5
MC		 1218
1219 if (iscsi_verify_itt(conn, itt))
1220 return NULL;
1221
913e5bf4
MC		 1222 task = iscsi_itt_to_task(conn, itt);
1223 if (!task || !task->sc)
0af967f5
MC		 1224 return NULL;
1225
913e5bf4
MC		 1226 if (task->sc->SCp.phase != conn->session->age) {
1227 iscsi_session_printk(KERN_ERR, conn->session,
1228 "task's session age %d, expected %d\n",
1229 task->sc->SCp.phase, conn->session->age);
0af967f5 1230 return NULL;
913e5bf4 1231 }
0af967f5 1232
9c19a7d0 1233 return task;
0af967f5
MC		 1234}
1235EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1236
40a06e75 1237void iscsi_session_failure(struct iscsi_session *session,
e5bd7b54
MC		 1238 enum iscsi_err err)
1239{
e5bd7b54
MC		 1240 struct iscsi_conn *conn;
1241 struct device *dev;
1242 unsigned long flags;
1243
1244 spin_lock_irqsave(&session->lock, flags);
1245 conn = session->leadconn;
1246 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1247 spin_unlock_irqrestore(&session->lock, flags);
1248 return;
1249 }
1250
1251 dev = get_device(&conn->cls_conn->dev);
1252 spin_unlock_irqrestore(&session->lock, flags);
1253 if (!dev)
1254 return;
1255 /*
1256 * if the host is being removed bypass the connection
1257 * recovery initialization because we are going to kill
1258 * the session.
1259 */
1260 if (err == ISCSI_ERR_INVALID_HOST)
1261 iscsi_conn_error_event(conn->cls_conn, err);
1262 else
1263 iscsi_conn_failure(conn, err);
1264 put_device(dev);
1265}
1266EXPORT_SYMBOL_GPL(iscsi_session_failure);
1267
7996a778
MC		 1268void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1269{
1270 struct iscsi_session *session = conn->session;
1271 unsigned long flags;
1272
1273 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 1274 if (session->state == ISCSI_STATE_FAILED) {
1275 spin_unlock_irqrestore(&session->lock, flags);
1276 return;
1277 }
1278
67a61114 1279 if (conn->stop_stage == 0)
7996a778
MC		 1280 session->state = ISCSI_STATE_FAILED;
1281 spin_unlock_irqrestore(&session->lock, flags);
e5bd7b54 1282
7996a778
MC		 1283 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1284 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1285 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1286}
1287EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1288
77a23c21
MC		 1289static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1290{
1291 struct iscsi_session *session = conn->session;
1292
1293 /*
1294 * Check for iSCSI window and take care of CmdSN wrap-around
1295 */
e0726407 1296 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1b2c7af8
MC		 1297 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1298 "%u MaxCmdSN %u CmdSN %u/%u\n",
1299 session->exp_cmdsn, session->max_cmdsn,
1300 session->cmdsn, session->queued_cmdsn);
77a23c21
MC		 1301 return -ENOSPC;
1302 }
1303 return 0;
1304}
1305
9c19a7d0 1306static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1307{
9c19a7d0 1308 struct iscsi_task *task = conn->task;
843c0a8a 1309 int rc;
77a23c21 1310
70b31c15
MC		 1311 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1312 return -ENODATA;
1313
9c19a7d0 1314 __iscsi_get_task(task);
77a23c21 1315 spin_unlock_bh(&conn->session->lock);
9c19a7d0 1316 rc = conn->session->tt->xmit_task(task);
77a23c21 1317 spin_lock_bh(&conn->session->lock);
d355e57d 1318 if (!rc) {
9c19a7d0 1319 /* done with this task */
d355e57d 1320 task->last_xfer = jiffies;
9c19a7d0 1321 conn->task = NULL;
d355e57d
MC		 1322 }
1323 __iscsi_put_task(task);
77a23c21
MC		 1324 return rc;
1325}
1326
843c0a8a 1327/**
9c19a7d0
MC		 1328 * iscsi_requeue_task - requeue task to run from session workqueue
1329 * @task: task to requeue
843c0a8a 1330 *
9c19a7d0 1331 * LLDs that need to run a task from the session workqueue should call
052d0144
MC		 1332 * this. The session lock must be held. This should only be called
1333 * by software drivers.
843c0a8a 1334 */
9c19a7d0 1335void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1336{
9c19a7d0 1337 struct iscsi_conn *conn = task->conn;
843c0a8a 1338
3bbaaad9
MC		 1339 /*
1340 * this may be on the requeue list already if the xmit_task callout
1341 * is handling the r2ts while we are adding new ones
1342 */
1343 if (list_empty(&task->running))
1344 list_add_tail(&task->running, &conn->requeue);
32ae763e 1345 iscsi_conn_queue_work(conn);
843c0a8a 1346}
9c19a7d0 1347EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1348
7996a778
MC		 1349/**
1350 * iscsi_data_xmit - xmit any command into the scheduled connection
1351 * @conn: iscsi connection
1352 *
1353 * Notes:
1354 * The function can return -EAGAIN in which case the caller must
1355 * re-schedule it again later or recover. '0' return code means
1356 * successful xmit.
1357 **/
1358static int iscsi_data_xmit(struct iscsi_conn *conn)
1359{
3219e529 1360 int rc = 0;
7996a778 1361
77a23c21 1362 spin_lock_bh(&conn->session->lock);
70b31c15 1363 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1b2c7af8 1364 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
77a23c21 1365 spin_unlock_bh(&conn->session->lock);
3219e529 1366 return -ENODATA;
7996a778 1367 }
7996a778 1368
9c19a7d0
MC		 1369 if (conn->task) {
1370 rc = iscsi_xmit_task(conn);
3219e529 1371 if (rc)
70b31c15 1372 goto done;
7996a778
MC		 1373 }
1374
77a23c21
MC		 1375 /*
1376 * process mgmt pdus like nops before commands since we should
1377 * only have one nop-out as a ping from us and targets should not
1378 * overflow us with nop-ins
1379 */
1380check_mgmt:
843c0a8a 1381 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1382 conn->task = list_entry(conn->mgmtqueue.next,
1383 struct iscsi_task, running);
3bbaaad9 1384 list_del_init(&conn->task->running);
9c19a7d0
MC		 1385 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1386 __iscsi_put_task(conn->task);
1387 conn->task = NULL;
b3a7ea8d
MC		 1388 continue;
1389 }
9c19a7d0 1390 rc = iscsi_xmit_task(conn);
77a23c21 1391 if (rc)
70b31c15 1392 goto done;
7996a778
MC		 1393 }
1394
843c0a8a 1395 /* process pending command queue */
3bbaaad9 1396 while (!list_empty(&conn->cmdqueue)) {
843c0a8a
MC		 1397 if (conn->tmf_state == TMF_QUEUED)
1398 break;
1399
3bbaaad9 1400 conn->task = list_entry(conn->cmdqueue.next,
9c19a7d0 1401 struct iscsi_task, running);
3bbaaad9 1402 list_del_init(&conn->task->running);
b3a7ea8d 1403 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
b3cd5050 1404 fail_scsi_task(conn->task, DID_IMM_RETRY);
b3a7ea8d
MC		 1405 continue;
1406 }
577577da
MC		 1407 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1408 if (rc) {
1409 if (rc == -ENOMEM) {
3bbaaad9
MC		 1410 list_add_tail(&conn->task->running,
1411 &conn->cmdqueue);
577577da 1412 conn->task = NULL;
70b31c15 1413 goto done;
577577da 1414 } else
b3cd5050 1415 fail_scsi_task(conn->task, DID_ABORT);
004d6530
BH		 1416 continue;
1417 }
9c19a7d0 1418 rc = iscsi_xmit_task(conn);
77a23c21 1419 if (rc)
70b31c15 1420 goto done;
77a23c21 1421 /*
9c19a7d0 1422 * we could continuously get new task requests so
77a23c21
MC		 1423 * we need to check the mgmt queue for nops that need to
1424 * be sent to aviod starvation
1425 */
843c0a8a
MC		 1426 if (!list_empty(&conn->mgmtqueue))
1427 goto check_mgmt;
1428 }
1429
1430 while (!list_empty(&conn->requeue)) {
1431 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1432 break;
1433
b3a7ea8d
MC		 1434 /*
1435 * we always do fastlogout - conn stop code will clean up.
1436 */
1437 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1438 break;
1439
9c19a7d0
MC		 1440 conn->task = list_entry(conn->requeue.next,
1441 struct iscsi_task, running);
3bbaaad9 1442 list_del_init(&conn->task->running);
9c19a7d0 1443 conn->task->state = ISCSI_TASK_RUNNING;
9c19a7d0 1444 rc = iscsi_xmit_task(conn);
843c0a8a 1445 if (rc)
70b31c15 1446 goto done;
843c0a8a 1447 if (!list_empty(&conn->mgmtqueue))
77a23c21 1448 goto check_mgmt;
7996a778 1449 }
b6c395ed 1450 spin_unlock_bh(&conn->session->lock);
3219e529 1451 return -ENODATA;
7996a778 1452
70b31c15 1453done:
77a23c21 1454 spin_unlock_bh(&conn->session->lock);
3219e529 1455 return rc;
7996a778
MC		 1456}
1457
c4028958 1458static void iscsi_xmitworker(struct work_struct *work)
7996a778 1459{
c4028958
DH		 1460 struct iscsi_conn *conn =
1461 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1462 int rc;
7996a778
MC		 1463 /*
1464 * serialize Xmit worker on a per-connection basis.
1465 */
3219e529
MC		 1466 do {
1467 rc = iscsi_data_xmit(conn);
1468 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1469}
1470
577577da
MC		 1471static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1472 struct scsi_cmnd *sc)
1473{
1474 struct iscsi_task *task;
1475
1476 if (!__kfifo_get(conn->session->cmdpool.queue,
1477 (void *) &task, sizeof(void *)))
1478 return NULL;
1479
1480 sc->SCp.phase = conn->session->age;
1481 sc->SCp.ptr = (char *) task;
1482
1483 atomic_set(&task->refcount, 1);
1484 task->state = ISCSI_TASK_PENDING;
1485 task->conn = conn;
1486 task->sc = sc;
d355e57d
MC		 1487 task->have_checked_conn = false;
1488 task->last_timeout = jiffies;
1489 task->last_xfer = jiffies;
577577da
MC		 1490 INIT_LIST_HEAD(&task->running);
1491 return task;
1492}
1493
7996a778
MC		 1494enum {
1495 FAILURE_BAD_HOST = 1,
1496 FAILURE_SESSION_FAILED,
1497 FAILURE_SESSION_FREED,
1498 FAILURE_WINDOW_CLOSED,
60ecebf5 1499 FAILURE_OOM,
7996a778 1500 FAILURE_SESSION_TERMINATE,
656cffc9 1501 FAILURE_SESSION_IN_RECOVERY,
7996a778 1502 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1503 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1504 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1505};
1506
1507int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1508{
75613521 1509 struct iscsi_cls_session *cls_session;
7996a778 1510 struct Scsi_Host *host;
1336aed1 1511 struct iscsi_host *ihost;
7996a778
MC		 1512 int reason = 0;
1513 struct iscsi_session *session;
1514 struct iscsi_conn *conn;
9c19a7d0 1515 struct iscsi_task *task = NULL;
7996a778
MC		 1516
1517 sc->scsi_done = done;
1518 sc->result = 0;
f47f2cf5 1519 sc->SCp.ptr = NULL;
7996a778
MC		 1520
1521 host = sc->device->host;
1336aed1 1522 ihost = shost_priv(host);
1040c99d 1523 spin_unlock(host->host_lock);
7996a778 1524
75613521
MC		 1525 cls_session = starget_to_session(scsi_target(sc->device));
1526 session = cls_session->dd_data;
7996a778
MC		 1527 spin_lock(&session->lock);
1528
75613521 1529 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1530 if (reason) {
1531 sc->result = reason;
1532 goto fault;
1533 }
1534
301e0f7e 1535 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9
MC		 1536 /*
1537 * to handle the race between when we set the recovery state
1538 * and block the session we requeue here (commands could
1539 * be entering our queuecommand while a block is starting
1540 * up because the block code is not locked)
1541 */
9000bcd6 1542 switch (session->state) {
301e0f7e 1543 case ISCSI_STATE_FAILED:
9000bcd6 1544 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1545 reason = FAILURE_SESSION_IN_RECOVERY;
301e0f7e
MC		 1546 sc->result = DID_IMM_RETRY << 16;
1547 break;
9000bcd6
MC		 1548 case ISCSI_STATE_LOGGING_OUT:
1549 reason = FAILURE_SESSION_LOGGING_OUT;
301e0f7e
MC		 1550 sc->result = DID_IMM_RETRY << 16;
1551 break;
b3a7ea8d 1552 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1553 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1554 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1555 break;
1556 case ISCSI_STATE_TERMINATE:
656cffc9 1557 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1558 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1559 break;
b3a7ea8d 1560 default:
656cffc9 1561 reason = FAILURE_SESSION_FREED;
6eabafbe 1562 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1563 }
7996a778
MC		 1564 goto fault;
1565 }
1566
7996a778 1567 conn = session->leadconn;
98644047
MC		 1568 if (!conn) {
1569 reason = FAILURE_SESSION_FREED;
6eabafbe 1570 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1571 goto fault;
1572 }
7996a778 1573
661134ad
MC		 1574 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1575 reason = FAILURE_SESSION_IN_RECOVERY;
1576 sc->result = DID_REQUEUE;
1577 goto fault;
1578 }
1579
77a23c21
MC		 1580 if (iscsi_check_cmdsn_window_closed(conn)) {
1581 reason = FAILURE_WINDOW_CLOSED;
1582 goto reject;
1583 }
1584
577577da
MC		 1585 task = iscsi_alloc_task(conn, sc);
1586 if (!task) {
60ecebf5
MC		 1587 reason = FAILURE_OOM;
1588 goto reject;
1589 }
7996a778 1590
1336aed1 1591 if (!ihost->workq) {
577577da
MC		 1592 reason = iscsi_prep_scsi_cmd_pdu(task);
1593 if (reason) {
1594 if (reason == -ENOMEM) {
1595 reason = FAILURE_OOM;
1596 goto prepd_reject;
1597 } else {
1598 sc->result = DID_ABORT << 16;
1599 goto prepd_fault;
1600 }
052d0144 1601 }
9c19a7d0 1602 if (session->tt->xmit_task(task)) {
d3305f34 1603 session->cmdsn--;
052d0144 1604 reason = FAILURE_SESSION_NOT_READY;
577577da 1605 goto prepd_reject;
052d0144 1606 }
3bbaaad9
MC		 1607 } else {
1608 list_add_tail(&task->running, &conn->cmdqueue);
32ae763e 1609 iscsi_conn_queue_work(conn);
3bbaaad9 1610 }
052d0144
MC		 1611
1612 session->queued_cmdsn++;
1613 spin_unlock(&session->lock);
1040c99d 1614 spin_lock(host->host_lock);
7996a778
MC		 1615 return 0;
1616
577577da
MC		 1617prepd_reject:
1618 sc->scsi_done = NULL;
b3cd5050 1619 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1620reject:
1621 spin_unlock(&session->lock);
1b2c7af8
MC		 1622 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1623 sc->cmnd[0], reason);
1040c99d 1624 spin_lock(host->host_lock);
d6d13ee1 1625 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778 1626
577577da
MC		 1627prepd_fault:
1628 sc->scsi_done = NULL;
b3cd5050 1629 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1630fault:
1631 spin_unlock(&session->lock);
1b2c7af8
MC		 1632 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1633 sc->cmnd[0], reason);
c07d4444
BH		 1634 if (!scsi_bidi_cmnd(sc))
1635 scsi_set_resid(sc, scsi_bufflen(sc));
1636 else {
1637 scsi_out(sc)->resid = scsi_out(sc)->length;
1638 scsi_in(sc)->resid = scsi_in(sc)->length;
1639 }
052d0144 1640 done(sc);
1040c99d 1641 spin_lock(host->host_lock);
7996a778
MC		 1642 return 0;
1643}
1644EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1645
1646int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1647{
7996a778
MC		 1648 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1649 return sdev->queue_depth;
1650}
1651EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1652
6b5d6c44
MC		 1653int iscsi_target_alloc(struct scsi_target *starget)
1654{
1655 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1656 struct iscsi_session *session = cls_session->dd_data;
1657
1658 starget->can_queue = session->scsi_cmds_max;
1659 return 0;
1660}
1661EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1662
7996a778
MC		 1663void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1664{
75613521 1665 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 1666
1667 spin_lock_bh(&session->lock);
1668 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1669 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1670 if (session->leadconn)
1671 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1672 }
1673 spin_unlock_bh(&session->lock);
1674}
1675EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1676
8e124525 1677int iscsi_eh_target_reset(struct scsi_cmnd *sc)
7996a778 1678{
75613521
MC		 1679 struct iscsi_cls_session *cls_session;
1680 struct iscsi_session *session;
1681 struct iscsi_conn *conn;
1682
1683 cls_session = starget_to_session(scsi_target(sc->device));
1684 session = cls_session->dd_data;
1685 conn = session->leadconn;
7996a778 1686
bc436b27 1687 mutex_lock(&session->eh_mutex);
7996a778
MC		 1688 spin_lock_bh(&session->lock);
1689 if (session->state == ISCSI_STATE_TERMINATE) {
1690failed:
bd2199d4
EZ		 1691 ISCSI_DBG_EH(session,
1692 "failing target reset: Could not log back into "
1693 "target [age %d]\n",
1694 session->age);
7996a778 1695 spin_unlock_bh(&session->lock);
bc436b27 1696 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1697 return FAILED;
1698 }
1699
7996a778 1700 spin_unlock_bh(&session->lock);
bc436b27 1701 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1702 /*
1703 * we drop the lock here but the leadconn cannot be destoyed while
1704 * we are in the scsi eh
1705 */
843c0a8a 1706 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778 1707
bd2199d4 1708 ISCSI_DBG_EH(session, "wait for relogin\n");
7996a778
MC		 1709 wait_event_interruptible(conn->ehwait,
1710 session->state == ISCSI_STATE_TERMINATE ||
1711 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1712 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1713 if (signal_pending(current))
1714 flush_signals(current);
1715
bc436b27 1716 mutex_lock(&session->eh_mutex);
7996a778 1717 spin_lock_bh(&session->lock);
bd2199d4
EZ		 1718 if (session->state == ISCSI_STATE_LOGGED_IN) {
1719 ISCSI_DBG_EH(session,
1720 "target reset succeeded\n");
1721 } else
7996a778
MC		 1722 goto failed;
1723 spin_unlock_bh(&session->lock);
bc436b27 1724 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1725 return SUCCESS;
1726}
8e124525 1727EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
7996a778 1728
843c0a8a 1729static void iscsi_tmf_timedout(unsigned long data)
7996a778 1730{
843c0a8a 1731 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1732 struct iscsi_session *session = conn->session;
1733
1734 spin_lock(&session->lock);
843c0a8a
MC		 1735 if (conn->tmf_state == TMF_QUEUED) {
1736 conn->tmf_state = TMF_TIMEDOUT;
bd2199d4 1737 ISCSI_DBG_EH(session, "tmf timedout\n");
7996a778
MC		 1738 /* unblock eh_abort() */
1739 wake_up(&conn->ehwait);
1740 }
1741 spin_unlock(&session->lock);
1742}
1743
9c19a7d0 1744static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1745 struct iscsi_tm *hdr, int age,
1746 int timeout)
7996a778 1747{
7996a778 1748 struct iscsi_session *session = conn->session;
9c19a7d0 1749 struct iscsi_task *task;
7996a778 1750
9c19a7d0 1751 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1752 NULL, 0);
9c19a7d0 1753 if (!task) {
6724add1 1754 spin_unlock_bh(&session->lock);
7996a778 1755 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a 1756 spin_lock_bh(&session->lock);
bd2199d4 1757 ISCSI_DBG_EH(session, "tmf exec failure\n");
77a23c21 1758 return -EPERM;
7996a778 1759 }
843c0a8a 1760 conn->tmfcmd_pdus_cnt++;
f6d5180c 1761 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1762 conn->tmf_timer.function = iscsi_tmf_timedout;
1763 conn->tmf_timer.data = (unsigned long)conn;
1764 add_timer(&conn->tmf_timer);
bd2199d4 1765 ISCSI_DBG_EH(session, "tmf set timeout\n");
7996a778 1766
7996a778 1767 spin_unlock_bh(&session->lock);
6724add1 1768 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1769
1770 /*
1771 * block eh thread until:
1772 *
843c0a8a
MC		 1773 * 1) tmf response
1774 * 2) tmf timeout
7996a778
MC		 1775 * 3) session is terminated or restarted or userspace has
1776 * given up on recovery
1777 */
843c0a8a 1778 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1779 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1780 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1781 if (signal_pending(current))
1782 flush_signals(current);
843c0a8a
MC		 1783 del_timer_sync(&conn->tmf_timer);
1784
6724add1 1785 mutex_lock(&session->eh_mutex);
77a23c21 1786 spin_lock_bh(&session->lock);
9c19a7d0 1787 /* if the session drops it will clean up the task */
843c0a8a
MC		 1788 if (age != session->age ||
1789 session->state != ISCSI_STATE_LOGGED_IN)
1790 return -ENOTCONN;
7996a778
MC		 1791 return 0;
1792}
1793
843c0a8a
MC		 1794/*
1795 * Fail commands. session lock held and recv side suspended and xmit
1796 * thread flushed
1797 */
3bbaaad9
MC		 1798static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1799 int error)
843c0a8a 1800{
3bbaaad9
MC		 1801 struct iscsi_task *task;
1802 int i;
843c0a8a 1803
3bbaaad9
MC		 1804 for (i = 0; i < conn->session->cmds_max; i++) {
1805 task = conn->session->cmds[i];
1806 if (!task->sc || task->state == ISCSI_TASK_FREE)
1807 continue;
843c0a8a 1808
3bbaaad9
MC		 1809 if (lun != -1 && lun != task->sc->device->lun)
1810 continue;
843c0a8a 1811
3bbaaad9
MC		 1812 ISCSI_DBG_SESSION(conn->session,
1813 "failing sc %p itt 0x%x state %d\n",
1814 task->sc, task->itt, task->state);
b3cd5050 1815 fail_scsi_task(task, error);
843c0a8a
MC		 1816 }
1817}
1818
661134ad
MC		 1819/**
1820 * iscsi_suspend_queue - suspend iscsi_queuecommand
1821 * @conn: iscsi conn to stop queueing IO on
1822 *
1823 * This grabs the session lock to make sure no one is in
1824 * xmit_task/queuecommand, and then sets suspend to prevent
1825 * new commands from being queued. This only needs to be called
1826 * by offload drivers that need to sync a path like ep disconnect
1827 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1828 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1829 */
1830void iscsi_suspend_queue(struct iscsi_conn *conn)
1831{
1832 spin_lock_bh(&conn->session->lock);
1833 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1834 spin_unlock_bh(&conn->session->lock);
1835}
1836EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1837
1838/**
1839 * iscsi_suspend_tx - suspend iscsi_data_xmit
1840 * @conn: iscsi conn tp stop processing IO on.
1841 *
1842 * This function sets the suspend bit to prevent iscsi_data_xmit
1843 * from sending new IO, and if work is queued on the xmit thread
1844 * it will wait for it to be completed.
1845 */
b40977d9 1846void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1 1847{
32ae763e
MC		 1848 struct Scsi_Host *shost = conn->session->host;
1849 struct iscsi_host *ihost = shost_priv(shost);
1850
6724add1 1851 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1852 if (ihost->workq)
32ae763e 1853 flush_workqueue(ihost->workq);
6724add1 1854}
b40977d9 1855EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1856
1857static void iscsi_start_tx(struct iscsi_conn *conn)
1858{
1859 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1860 iscsi_conn_queue_work(conn);
6724add1
MC		 1861}
1862
4c48a829
MC		 1863/*
1864 * We want to make sure a ping is in flight. It has timed out.
1865 * And we are not busy processing a pdu that is making
1866 * progress but got started before the ping and is taking a while
1867 * to complete so the ping is just stuck behind it in a queue.
1868 */
1869static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1870{
1871 if (conn->ping_task &&
1872 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1873 (conn->ping_timeout * HZ), jiffies))
1874 return 1;
1875 else
1876 return 0;
1877}
1878
d355e57d 1879static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
f6d5180c 1880{
d355e57d
MC		 1881 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
1882 struct iscsi_task *task = NULL;
f6d5180c
MC		 1883 struct iscsi_cls_session *cls_session;
1884 struct iscsi_session *session;
1885 struct iscsi_conn *conn;
f6d5180c 1886
d355e57d 1887 cls_session = starget_to_session(scsi_target(sc->device));
75613521 1888 session = cls_session->dd_data;
f6d5180c 1889
bd2199d4 1890 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
f6d5180c
MC		 1891
1892 spin_lock(&session->lock);
1893 if (session->state != ISCSI_STATE_LOGGED_IN) {
1894 /*
1895 * We are probably in the middle of iscsi recovery so let
1896 * that complete and handle the error.
1897 */
242f9dcb 1898 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1899 goto done;
1900 }
1901
1902 conn = session->leadconn;
1903 if (!conn) {
1904 /* In the middle of shuting down */
242f9dcb 1905 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1906 goto done;
1907 }
1908
d355e57d
MC		 1909 task = (struct iscsi_task *)sc->SCp.ptr;
1910 if (!task)
1911 goto done;
1912 /*
1913 * If we have sent (at least queued to the network layer) a pdu or
1914 * recvd one for the task since the last timeout ask for
1915 * more time. If on the next timeout we have not made progress
1916 * we can check if it is the task or connection when we send the
1917 * nop as a ping.
1918 */
1919 if (time_after_eq(task->last_xfer, task->last_timeout)) {
bd2199d4
EZ		 1920 ISCSI_DBG_EH(session, "Command making progress. Asking "
1921 "scsi-ml for more time to complete. "
1922 "Last data recv at %lu. Last timeout was at "
1923 "%lu\n.", task->last_xfer, task->last_timeout);
d355e57d
MC		 1924 task->have_checked_conn = false;
1925 rc = BLK_EH_RESET_TIMER;
1926 goto done;
1927 }
1928
f6d5180c
MC		 1929 if (!conn->recv_timeout && !conn->ping_timeout)
1930 goto done;
1931 /*
1932 * if the ping timedout then we are in the middle of cleaning up
1933 * and can let the iscsi eh handle it
1934 */
4c48a829 1935 if (iscsi_has_ping_timed_out(conn)) {
242f9dcb 1936 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 1937 goto done;
1938 }
d355e57d
MC		 1939
1940 /* Assumes nop timeout is shorter than scsi cmd timeout */
1941 if (task->have_checked_conn)
1942 goto done;
1943
f6d5180c 1944 /*
d355e57d
MC		 1945 * Checking the transport already or nop from a cmd timeout still
1946 * running
f6d5180c 1947 */
d355e57d
MC		 1948 if (conn->ping_task) {
1949 task->have_checked_conn = true;
242f9dcb 1950 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 1951 goto done;
1952 }
1953
d355e57d
MC		 1954 /* Make sure there is a transport check done */
1955 iscsi_send_nopout(conn, NULL);
1956 task->have_checked_conn = true;
1957 rc = BLK_EH_RESET_TIMER;
1958
f6d5180c 1959done:
d355e57d
MC		 1960 if (task)
1961 task->last_timeout = jiffies;
f6d5180c 1962 spin_unlock(&session->lock);
bd2199d4
EZ		 1963 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
1964 "timer reset" : "nh");
f6d5180c
MC		 1965 return rc;
1966}
1967
1968static void iscsi_check_transport_timeouts(unsigned long data)
1969{
1970 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1971 struct iscsi_session *session = conn->session;
4cf10435 1972 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c
MC		 1973
1974 spin_lock(&session->lock);
1975 if (session->state != ISCSI_STATE_LOGGED_IN)
1976 goto done;
1977
4cf10435
MC		 1978 recv_timeout = conn->recv_timeout;
1979 if (!recv_timeout)
f6d5180c
MC		 1980 goto done;
1981
4cf10435 1982 recv_timeout *= HZ;
f6d5180c 1983 last_recv = conn->last_recv;
4c48a829
MC		 1984
1985 if (iscsi_has_ping_timed_out(conn)) {
322d739d 1986 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
4c48a829
MC		 1987 "expired, recv timeout %d, last rx %lu, "
1988 "last ping %lu, now %lu\n",
1989 conn->ping_timeout, conn->recv_timeout,
1990 last_recv, conn->last_ping, jiffies);
f6d5180c
MC		 1991 spin_unlock(&session->lock);
1992 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1993 return;
1994 }
1995
4cf10435 1996 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97 1997 /* send a ping to try to provoke some traffic */
1b2c7af8 1998 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
c8611f97 1999 iscsi_send_nopout(conn, NULL);
4cf10435 2000 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 2001 } else
4cf10435 2002 next_timeout = last_recv + recv_timeout;
f6d5180c 2003
1b2c7af8 2004 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
ad294e9c 2005 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 2006done:
2007 spin_unlock(&session->lock);
2008}
2009
9c19a7d0 2010static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 2011 struct iscsi_tm *hdr)
2012{
2013 memset(hdr, 0, sizeof(*hdr));
2014 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2015 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2016 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
577577da
MC		 2017 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
2018 hdr->rtt = task->hdr_itt;
2019 hdr->refcmdsn = task->cmdsn;
843c0a8a
MC		 2020}
2021
7996a778
MC		 2022int iscsi_eh_abort(struct scsi_cmnd *sc)
2023{
75613521
MC		 2024 struct iscsi_cls_session *cls_session;
2025 struct iscsi_session *session;
f47f2cf5 2026 struct iscsi_conn *conn;
9c19a7d0 2027 struct iscsi_task *task;
843c0a8a
MC		 2028 struct iscsi_tm *hdr;
2029 int rc, age;
7996a778 2030
75613521
MC		 2031 cls_session = starget_to_session(scsi_target(sc->device));
2032 session = cls_session->dd_data;
2033
bd2199d4 2034 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
4421c9eb 2035
6724add1
MC		 2036 mutex_lock(&session->eh_mutex);
2037 spin_lock_bh(&session->lock);
f47f2cf5
MC		 2038 /*
2039 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2040 * got the command.
2041 */
2042 if (!sc->SCp.ptr) {
bd2199d4
EZ		 2043 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2044 "it completed.\n");
6724add1
MC		 2045 spin_unlock_bh(&session->lock);
2046 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 2047 return SUCCESS;
2048 }
2049
7996a778
MC		 2050 /*
2051 * If we are not logged in or we have started a new session
2052 * then let the host reset code handle this
2053 */
843c0a8a
MC		 2054 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2055 sc->SCp.phase != session->age) {
2056 spin_unlock_bh(&session->lock);
2057 mutex_unlock(&session->eh_mutex);
bd2199d4 2058 ISCSI_DBG_EH(session, "failing abort due to dropped "
4421c9eb 2059 "session.\n");
843c0a8a
MC		 2060 return FAILED;
2061 }
2062
2063 conn = session->leadconn;
2064 conn->eh_abort_cnt++;
2065 age = session->age;
2066
9c19a7d0 2067 task = (struct iscsi_task *)sc->SCp.ptr;
bd2199d4
EZ		 2068 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2069 sc, task->itt);
7996a778 2070
9c19a7d0
MC		 2071 /* task completed before time out */
2072 if (!task->sc) {
bd2199d4 2073 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
77a23c21 2074 goto success;
7ea8b828 2075 }
7996a778 2076
9c19a7d0 2077 if (task->state == ISCSI_TASK_PENDING) {
b3cd5050 2078 fail_scsi_task(task, DID_ABORT);
77a23c21
MC		 2079 goto success;
2080 }
7996a778 2081
843c0a8a
MC		 2082 /* only have one tmf outstanding at a time */
2083 if (conn->tmf_state != TMF_INITIAL)
7996a778 2084 goto failed;
843c0a8a 2085 conn->tmf_state = TMF_QUEUED;
7996a778 2086
843c0a8a 2087 hdr = &conn->tmhdr;
9c19a7d0 2088 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 2089
9c19a7d0 2090 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 2091 rc = FAILED;
2092 goto failed;
2093 }
2094
2095 switch (conn->tmf_state) {
2096 case TMF_SUCCESS:
77a23c21 2097 spin_unlock_bh(&session->lock);
913e5bf4
MC		 2098 /*
2099 * stop tx side incase the target had sent a abort rsp but
2100 * the initiator was still writing out data.
2101 */
6724add1 2102 iscsi_suspend_tx(conn);
77a23c21 2103 /*
913e5bf4
MC		 2104 * we do not stop the recv side because targets have been
2105 * good and have never sent us a successful tmf response
2106 * then sent more data for the cmd.
77a23c21 2107 */
6187c242 2108 spin_lock_bh(&session->lock);
b3cd5050 2109 fail_scsi_task(task, DID_ABORT);
843c0a8a 2110 conn->tmf_state = TMF_INITIAL;
6187c242 2111 spin_unlock_bh(&session->lock);
6724add1 2112 iscsi_start_tx(conn);
77a23c21 2113 goto success_unlocked;
843c0a8a
MC		 2114 case TMF_TIMEDOUT:
2115 spin_unlock_bh(&session->lock);
2116 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2117 goto failed_unlocked;
2118 case TMF_NOT_FOUND:
2119 if (!sc->SCp.ptr) {
2120 conn->tmf_state = TMF_INITIAL;
9c19a7d0 2121 /* task completed before tmf abort response */
bd2199d4
EZ		 2122 ISCSI_DBG_EH(session, "sc completed while abort in "
2123 "progress\n");
77a23c21 2124 goto success;
7ea8b828
MC		 2125 }
2126 /* fall through */
2127 default:
843c0a8a
MC		 2128 conn->tmf_state = TMF_INITIAL;
2129 goto failed;
7996a778
MC		 2130 }
2131
77a23c21 2132success:
7996a778 2133 spin_unlock_bh(&session->lock);
77a23c21 2134success_unlocked:
bd2199d4
EZ		 2135 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2136 sc, task->itt);
6724add1 2137 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2138 return SUCCESS;
2139
2140failed:
2141 spin_unlock_bh(&session->lock);
77a23c21 2142failed_unlocked:
bd2199d4
EZ		 2143 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2144 task ? task->itt : 0);
6724add1 2145 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2146 return FAILED;
2147}
2148EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2149
843c0a8a
MC		 2150static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2151{
2152 memset(hdr, 0, sizeof(*hdr));
2153 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2154 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2155 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2156 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 2157 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 2158}
2159
2160int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2161{
75613521
MC		 2162 struct iscsi_cls_session *cls_session;
2163 struct iscsi_session *session;
843c0a8a
MC		 2164 struct iscsi_conn *conn;
2165 struct iscsi_tm *hdr;
2166 int rc = FAILED;
2167
75613521
MC		 2168 cls_session = starget_to_session(scsi_target(sc->device));
2169 session = cls_session->dd_data;
2170
bd2199d4 2171 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
843c0a8a
MC		 2172
2173 mutex_lock(&session->eh_mutex);
2174 spin_lock_bh(&session->lock);
2175 /*
2176 * Just check if we are not logged in. We cannot check for
2177 * the phase because the reset could come from a ioctl.
2178 */
2179 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2180 goto unlock;
2181 conn = session->leadconn;
2182
2183 /* only have one tmf outstanding at a time */
2184 if (conn->tmf_state != TMF_INITIAL)
2185 goto unlock;
2186 conn->tmf_state = TMF_QUEUED;
2187
2188 hdr = &conn->tmhdr;
2189 iscsi_prep_lun_reset_pdu(sc, hdr);
2190
9c19a7d0 2191 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 2192 session->lu_reset_timeout)) {
843c0a8a
MC		 2193 rc = FAILED;
2194 goto unlock;
2195 }
2196
2197 switch (conn->tmf_state) {
2198 case TMF_SUCCESS:
2199 break;
2200 case TMF_TIMEDOUT:
2201 spin_unlock_bh(&session->lock);
2202 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2203 goto done;
2204 default:
2205 conn->tmf_state = TMF_INITIAL;
2206 goto unlock;
2207 }
2208
2209 rc = SUCCESS;
2210 spin_unlock_bh(&session->lock);
2211
2212 iscsi_suspend_tx(conn);
913e5bf4 2213
a3439148 2214 spin_lock_bh(&session->lock);
3bbaaad9 2215 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
843c0a8a 2216 conn->tmf_state = TMF_INITIAL;
a3439148 2217 spin_unlock_bh(&session->lock);
843c0a8a
MC		 2218
2219 iscsi_start_tx(conn);
2220 goto done;
2221
2222unlock:
2223 spin_unlock_bh(&session->lock);
2224done:
bd2199d4
EZ		 2225 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2226 rc == SUCCESS ? "SUCCESS" : "FAILED");
843c0a8a
MC		 2227 mutex_unlock(&session->eh_mutex);
2228 return rc;
2229}
2230EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2231
6320377f
OK		 2232/*
2233 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2234 * should be accessed via kfifo_{get,put} on q->queue.
2235 * Optionally, the caller can obtain the array of object pointers
2236 * by passing in a non-NULL @items pointer
2237 */
7996a778 2238int
6320377f 2239iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 2240{
6320377f 2241 int i, num_arrays = 1;
7996a778 2242
6320377f 2243 memset(q, 0, sizeof(*q));
7996a778
MC		 2244
2245 q->max = max;
6320377f
OK		 2246
2247 /* If the user passed an items pointer, he wants a copy of
2248 * the array. */
2249 if (items)
2250 num_arrays++;
2251 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2252 if (q->pool == NULL)
f474a37b 2253 return -ENOMEM;
7996a778
MC		 2254
2255 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
2256 GFP_KERNEL, NULL);
fd6e1c14
JD		 2257 if (IS_ERR(q->queue)) {
2258 q->queue = NULL;
6320377f 2259 goto enomem;
fd6e1c14 2260 }
7996a778
MC		 2261
2262 for (i = 0; i < max; i++) {
6320377f 2263 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 2264 if (q->pool[i] == NULL) {
6320377f
OK		 2265 q->max = i;
2266 goto enomem;
7996a778 2267 }
7996a778
MC		 2268 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
2269 }
6320377f
OK		 2270
2271 if (items) {
2272 *items = q->pool + max;
2273 memcpy(*items, q->pool, max * sizeof(void *));
2274 }
2275
7996a778 2276 return 0;
6320377f
OK		 2277
2278enomem:
2279 iscsi_pool_free(q);
2280 return -ENOMEM;
7996a778
MC		 2281}
2282EXPORT_SYMBOL_GPL(iscsi_pool_init);
2283
6320377f 2284void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 2285{
2286 int i;
2287
2288 for (i = 0; i < q->max; i++)
6320377f 2289 kfree(q->pool[i]);
f474a37b 2290 kfree(q->pool);
2f5899a3 2291 kfree(q->queue);
7996a778
MC		 2292}
2293EXPORT_SYMBOL_GPL(iscsi_pool_free);
2294
a4804cd6
MC		 2295/**
2296 * iscsi_host_add - add host to system
2297 * @shost: scsi host
2298 * @pdev: parent device
2299 *
2300 * This should be called by partial offload and software iscsi drivers
2301 * to add a host to the system.
2302 */
2303int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2304{
8e9a20ce
MC		 2305 if (!shost->can_queue)
2306 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2307
4d108350
MC		 2308 if (!shost->cmd_per_lun)
2309 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2310
308cec14
MC		 2311 if (!shost->transportt->eh_timed_out)
2312 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
a4804cd6
MC		 2313 return scsi_add_host(shost, pdev);
2314}
2315EXPORT_SYMBOL_GPL(iscsi_host_add);
2316
2317/**
2318 * iscsi_host_alloc - allocate a host and driver data
2319 * @sht: scsi host template
2320 * @dd_data_size: driver host data size
32ae763e 2321 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
a4804cd6
MC		 2322 *
2323 * This should be called by partial offload and software iscsi drivers.
2324 * To access the driver specific memory use the iscsi_host_priv() macro.
2325 */
2326struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
4d108350 2327 int dd_data_size, bool xmit_can_sleep)
75613521 2328{
a4804cd6 2329 struct Scsi_Host *shost;
e5bd7b54 2330 struct iscsi_host *ihost;
a4804cd6
MC		 2331
2332 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2333 if (!shost)
2334 return NULL;
e5bd7b54 2335 ihost = shost_priv(shost);
32ae763e
MC		 2336
2337 if (xmit_can_sleep) {
2338 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2339 "iscsi_q_%d", shost->host_no);
2340 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2341 if (!ihost->workq)
2342 goto free_host;
2343 }
2344
e5bd7b54
MC		 2345 spin_lock_init(&ihost->lock);
2346 ihost->state = ISCSI_HOST_SETUP;
2347 ihost->num_sessions = 0;
2348 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6 2349 return shost;
32ae763e
MC		 2350
2351free_host:
2352 scsi_host_put(shost);
2353 return NULL;
a4804cd6
MC		 2354}
2355EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2356
e5bd7b54
MC		 2357static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2358{
40a06e75 2359 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
e5bd7b54
MC		 2360}
2361
a4804cd6
MC		 2362/**
2363 * iscsi_host_remove - remove host and sessions
2364 * @shost: scsi host
2365 *
e5bd7b54
MC		 2366 * If there are any sessions left, this will initiate the removal and wait
2367 * for the completion.
a4804cd6
MC		 2368 */
2369void iscsi_host_remove(struct Scsi_Host *shost)
2370{
e5bd7b54
MC		 2371 struct iscsi_host *ihost = shost_priv(shost);
2372 unsigned long flags;
2373
2374 spin_lock_irqsave(&ihost->lock, flags);
2375 ihost->state = ISCSI_HOST_REMOVED;
2376 spin_unlock_irqrestore(&ihost->lock, flags);
2377
2378 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2379 wait_event_interruptible(ihost->session_removal_wq,
2380 ihost->num_sessions == 0);
2381 if (signal_pending(current))
2382 flush_signals(current);
2383
a4804cd6 2384 scsi_remove_host(shost);
32ae763e
MC		 2385 if (ihost->workq)
2386 destroy_workqueue(ihost->workq);
75613521 2387}
a4804cd6 2388EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 2389
a4804cd6 2390void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 2391{
2392 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2393
75613521
MC		 2394 kfree(ihost->netdev);
2395 kfree(ihost->hwaddress);
2396 kfree(ihost->initiatorname);
a4804cd6 2397 scsi_host_put(shost);
75613521 2398}
a4804cd6 2399EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2400
e5bd7b54
MC		 2401static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2402{
2403 struct iscsi_host *ihost = shost_priv(shost);
2404 unsigned long flags;
2405
2406 shost = scsi_host_get(shost);
2407 if (!shost) {
2408 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2409 "of session teardown event because host already "
2410 "removed.\n");
2411 return;
2412 }
2413
2414 spin_lock_irqsave(&ihost->lock, flags);
2415 ihost->num_sessions--;
2416 if (ihost->num_sessions == 0)
2417 wake_up(&ihost->session_removal_wq);
2418 spin_unlock_irqrestore(&ihost->lock, flags);
2419 scsi_host_put(shost);
2420}
2421
7996a778
MC		 2422/**
2423 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2424 * @iscsit: iscsi transport template
75613521
MC		 2425 * @shost: scsi host
2426 * @cmds_max: session can queue
9c19a7d0 2427 * @cmd_task_size: LLD task private data size
7996a778 2428 * @initial_cmdsn: initial CmdSN
7996a778
MC		 2429 *
2430 * This can be used by software iscsi_transports that allocate
2431 * a session per scsi host.
3cf7b233
MC		 2432 *
2433 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2434 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2435 * for nop handling and login/logout requests.
75613521 2436 */
7996a778 2437struct iscsi_cls_session *
75613521 2438iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
b8b9e1b8 2439 uint16_t cmds_max, int dd_size, int cmd_task_size,
7970634b 2440 uint32_t initial_cmdsn, unsigned int id)
7996a778 2441{
e5bd7b54 2442 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2443 struct iscsi_session *session;
2444 struct iscsi_cls_session *cls_session;
3cf7b233 2445 int cmd_i, scsi_cmds, total_cmds = cmds_max;
e5bd7b54
MC		 2446 unsigned long flags;
2447
2448 spin_lock_irqsave(&ihost->lock, flags);
2449 if (ihost->state == ISCSI_HOST_REMOVED) {
2450 spin_unlock_irqrestore(&ihost->lock, flags);
2451 return NULL;
2452 }
2453 ihost->num_sessions++;
2454 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce
MC		 2455
2456 if (!total_cmds)
2457 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 2458 /*
3cf7b233
MC		 2459 * The iscsi layer needs some tasks for nop handling and tmfs,
2460 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2461 * + 1 command for scsi IO.
3e5c28ad 2462 */
3cf7b233
MC		 2463 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2464 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2465 "must be a power of two that is at least %d.\n",
2466 total_cmds, ISCSI_TOTAL_CMDS_MIN);
e5bd7b54 2467 goto dec_session_count;
3cf7b233
MC		 2468 }
2469
2470 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2471 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2472 "must be a power of 2 less than or equal to %d.\n",
2473 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2474 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2475 }
2476
2477 if (!is_power_of_2(total_cmds)) {
2478 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2479 "must be a power of 2.\n", total_cmds);
2480 total_cmds = rounddown_pow_of_two(total_cmds);
2481 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2482 return NULL;
2483 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2484 total_cmds);
1548271e 2485 }
3cf7b233 2486 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2487
5d91e209 2488 cls_session = iscsi_alloc_session(shost, iscsit,
b8b9e1b8
JK		 2489 sizeof(struct iscsi_session) +
2490 dd_size);
75613521 2491 if (!cls_session)
e5bd7b54 2492 goto dec_session_count;
75613521
MC		 2493 session = cls_session->dd_data;
2494 session->cls_session = cls_session;
7996a778
MC		 2495 session->host = shost;
2496 session->state = ISCSI_STATE_FREE;
f6d5180c 2497 session->fast_abort = 1;
4cd49ea1
MC		 2498 session->lu_reset_timeout = 15;
2499 session->abort_timeout = 10;
3cf7b233
MC		 2500 session->scsi_cmds_max = scsi_cmds;
2501 session->cmds_max = total_cmds;
e0726407 2502 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2503 session->exp_cmdsn = initial_cmdsn + 1;
2504 session->max_cmdsn = initial_cmdsn + 1;
2505 session->max_r2t = 1;
2506 session->tt = iscsit;
b8b9e1b8 2507 session->dd_data = cls_session->dd_data + sizeof(*session);
6724add1 2508 mutex_init(&session->eh_mutex);
75613521 2509 spin_lock_init(&session->lock);
7996a778
MC		 2510
2511 /* initialize SCSI PDU commands pool */
2512 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2513 (void***)&session->cmds,
9c19a7d0 2514 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2515 goto cmdpool_alloc_fail;
2516
2517 /* pre-format cmds pool with ITT */
2518 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2519 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2520
9c19a7d0
MC		 2521 if (cmd_task_size)
2522 task->dd_data = &task[1];
2523 task->itt = cmd_i;
3bbaaad9 2524 task->state = ISCSI_TASK_FREE;
9c19a7d0 2525 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2526 }
2527
f53a88da 2528 if (!try_module_get(iscsit->owner))
75613521 2529 goto module_get_fail;
7996a778 2530
7970634b 2531 if (iscsi_add_session(cls_session, id))
75613521 2532 goto cls_session_fail;
e5bd7b54 2533
7996a778
MC		 2534 return cls_session;
2535
2536cls_session_fail:
75613521
MC		 2537 module_put(iscsit->owner);
2538module_get_fail:
6320377f 2539 iscsi_pool_free(&session->cmdpool);
7996a778 2540cmdpool_alloc_fail:
75613521 2541 iscsi_free_session(cls_session);
e5bd7b54
MC		 2542dec_session_count:
2543 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2544 return NULL;
2545}
2546EXPORT_SYMBOL_GPL(iscsi_session_setup);
2547
2548/**
2549 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2550 * @cls_session: iscsi session
7996a778 2551 *
75613521
MC		 2552 * The driver must have called iscsi_remove_session before
2553 * calling this.
2554 */
7996a778
MC		 2555void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2556{
75613521 2557 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2558 struct module *owner = cls_session->transport->owner;
e5bd7b54 2559 struct Scsi_Host *shost = session->host;
7996a778 2560
6320377f 2561 iscsi_pool_free(&session->cmdpool);
7996a778 2562
b2c64167
MC		 2563 kfree(session->password);
2564 kfree(session->password_in);
2565 kfree(session->username);
2566 kfree(session->username_in);
f3ff0c36 2567 kfree(session->targetname);
88dfd340
MC		 2568 kfree(session->initiatorname);
2569 kfree(session->ifacename);
f3ff0c36 2570
75613521 2571 iscsi_destroy_session(cls_session);
e5bd7b54 2572 iscsi_host_dec_session_cnt(shost);
63f75cc8 2573 module_put(owner);
7996a778
MC		 2574}
2575EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2576
2577/**
2578 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2579 * @cls_session: iscsi_cls_session
5d91e209 2580 * @dd_size: private driver data size
7996a778 2581 * @conn_idx: cid
5d91e209 2582 */
7996a778 2583struct iscsi_cls_conn *
5d91e209
MC		 2584iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2585 uint32_t conn_idx)
7996a778 2586{
75613521 2587 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2588 struct iscsi_conn *conn;
2589 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2590 char *data;
7996a778 2591
5d91e209
MC		 2592 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2593 conn_idx);
7996a778
MC		 2594 if (!cls_conn)
2595 return NULL;
2596 conn = cls_conn->dd_data;
5d91e209 2597 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2598
5d91e209 2599 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2600 conn->session = session;
2601 conn->cls_conn = cls_conn;
2602 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2603 conn->id = conn_idx;
2604 conn->exp_statsn = 0;
843c0a8a 2605 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 2606
2607 init_timer(&conn->transport_timer);
2608 conn->transport_timer.data = (unsigned long)conn;
2609 conn->transport_timer.function = iscsi_check_transport_timeouts;
2610
843c0a8a 2611 INIT_LIST_HEAD(&conn->mgmtqueue);
3bbaaad9 2612 INIT_LIST_HEAD(&conn->cmdqueue);
843c0a8a 2613 INIT_LIST_HEAD(&conn->requeue);
c4028958 2614 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2615
9c19a7d0 2616 /* allocate login_task used for the login/text sequences */
7996a778 2617 spin_lock_bh(&session->lock);
3e5c28ad 2618 if (!__kfifo_get(session->cmdpool.queue,
9c19a7d0 2619 (void*)&conn->login_task,
7996a778
MC		 2620 sizeof(void*))) {
2621 spin_unlock_bh(&session->lock);
9c19a7d0 2622 goto login_task_alloc_fail;
7996a778
MC		 2623 }
2624 spin_unlock_bh(&session->lock);
2625
cfeb2cf9
MC		 2626 data = (char *) __get_free_pages(GFP_KERNEL,
2627 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
d36ab6f3 2628 if (!data)
9c19a7d0
MC		 2629 goto login_task_data_alloc_fail;
2630 conn->login_task->data = conn->data = data;
d36ab6f3 2631
843c0a8a 2632 init_timer(&conn->tmf_timer);
7996a778
MC		 2633 init_waitqueue_head(&conn->ehwait);
2634
2635 return cls_conn;
2636
9c19a7d0
MC		 2637login_task_data_alloc_fail:
2638 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2639 sizeof(void*));
9c19a7d0 2640login_task_alloc_fail:
7996a778
MC		 2641 iscsi_destroy_conn(cls_conn);
2642 return NULL;
2643}
2644EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2645
2646/**
2647 * iscsi_conn_teardown - teardown iscsi connection
2648 * cls_conn: iscsi class connection
2649 *
2650 * TODO: we may need to make this into a two step process
2651 * like scsi-mls remove + put host
2652 */
2653void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2654{
2655 struct iscsi_conn *conn = cls_conn->dd_data;
2656 struct iscsi_session *session = conn->session;
2657 unsigned long flags;
2658
f6d5180c
MC		 2659 del_timer_sync(&conn->transport_timer);
2660
7996a778
MC		 2661 spin_lock_bh(&session->lock);
2662 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2663 if (session->leadconn == conn) {
2664 /*
2665 * leading connection? then give up on recovery.
2666 */
2667 session->state = ISCSI_STATE_TERMINATE;
2668 wake_up(&conn->ehwait);
2669 }
2670 spin_unlock_bh(&session->lock);
2671
7996a778
MC		 2672 /*
2673 * Block until all in-progress commands for this connection
2674 * time out or fail.
2675 */
2676 for (;;) {
2677 spin_lock_irqsave(session->host->host_lock, flags);
2678 if (!session->host->host_busy) { /* OK for ERL == 0 */
2679 spin_unlock_irqrestore(session->host->host_lock, flags);
2680 break;
2681 }
2682 spin_unlock_irqrestore(session->host->host_lock, flags);
2683 msleep_interruptible(500);
322d739d
MC		 2684 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2685 "host_busy %d host_failed %d\n",
2686 session->host->host_busy,
2687 session->host->host_failed);
7996a778
MC		 2688 /*
2689 * force eh_abort() to unblock
2690 */
2691 wake_up(&conn->ehwait);
2692 }
2693
779ea120 2694 /* flush queued up work because we free the connection below */
843c0a8a 2695 iscsi_suspend_tx(conn);
779ea120 2696
7996a778 2697 spin_lock_bh(&session->lock);
cfeb2cf9
MC		 2698 free_pages((unsigned long) conn->data,
2699 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
f3ff0c36 2700 kfree(conn->persistent_address);
9c19a7d0 2701 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
7996a778 2702 sizeof(void*));
e0726407 2703 if (session->leadconn == conn)
7996a778 2704 session->leadconn = NULL;
7996a778
MC		 2705 spin_unlock_bh(&session->lock);
2706
7996a778
MC		 2707 iscsi_destroy_conn(cls_conn);
2708}
2709EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2710
2711int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2712{
2713 struct iscsi_conn *conn = cls_conn->dd_data;
2714 struct iscsi_session *session = conn->session;
2715
ffd0436e 2716 if (!session) {
322d739d
MC		 2717 iscsi_conn_printk(KERN_ERR, conn,
2718 "can't start unbound connection\n");
7996a778
MC		 2719 return -EPERM;
2720 }
2721
db98ccde
MC		 2722 if ((session->imm_data_en || !session->initial_r2t_en) &&
2723 session->first_burst > session->max_burst) {
322d739d
MC		 2724 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2725 "first_burst %d max_burst %d\n",
2726 session->first_burst, session->max_burst);
ffd0436e
MC		 2727 return -EINVAL;
2728 }
2729
f6d5180c 2730 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2731 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2732 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2733 conn->recv_timeout = 5;
2734 }
2735
2736 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2737 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2738 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2739 conn->ping_timeout = 5;
2740 }
2741
7996a778
MC		 2742 spin_lock_bh(&session->lock);
2743 conn->c_stage = ISCSI_CONN_STARTED;
2744 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2745 session->queued_cmdsn = session->cmdsn;
7996a778 2746
f6d5180c
MC		 2747 conn->last_recv = jiffies;
2748 conn->last_ping = jiffies;
2749 if (conn->recv_timeout && conn->ping_timeout)
2750 mod_timer(&conn->transport_timer,
2751 jiffies + (conn->recv_timeout * HZ));
2752
7996a778
MC		 2753 switch(conn->stop_stage) {
2754 case STOP_CONN_RECOVER:
2755 /*
2756 * unblock eh_abort() if it is blocked. re-try all
2757 * commands after successful recovery
2758 */
7996a778 2759 conn->stop_stage = 0;
843c0a8a 2760 conn->tmf_state = TMF_INITIAL;
7996a778 2761 session->age++;
8b1d0343
MC		 2762 if (session->age == 16)
2763 session->age = 0;
6eabafbe 2764 break;
7996a778 2765 case STOP_CONN_TERM:
7996a778 2766 conn->stop_stage = 0;
7996a778
MC		 2767 break;
2768 default:
2769 break;
2770 }
2771 spin_unlock_bh(&session->lock);
2772
75613521 2773 iscsi_unblock_session(session->cls_session);
6eabafbe 2774 wake_up(&conn->ehwait);
7996a778
MC		 2775 return 0;
2776}
2777EXPORT_SYMBOL_GPL(iscsi_conn_start);
2778
2779static void
3bbaaad9 2780fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
7996a778 2781{
3bbaaad9 2782 struct iscsi_task *task;
b3cd5050 2783 int i, state;
7996a778 2784
3bbaaad9
MC		 2785 for (i = 0; i < conn->session->cmds_max; i++) {
2786 task = conn->session->cmds[i];
2787 if (task->sc)
2788 continue;
7996a778 2789
3bbaaad9
MC		 2790 if (task->state == ISCSI_TASK_FREE)
2791 continue;
7996a778 2792
3bbaaad9
MC		 2793 ISCSI_DBG_SESSION(conn->session,
2794 "failing mgmt itt 0x%x state %d\n",
2795 task->itt, task->state);
b3cd5050
MC		 2796 state = ISCSI_TASK_ABRT_SESS_RECOV;
2797 if (task->state == ISCSI_TASK_PENDING)
2798 state = ISCSI_TASK_COMPLETED;
2799 iscsi_complete_task(task, state);
2800
3bbaaad9 2801 }
7996a778
MC		 2802}
2803
656cffc9
MC		 2804static void iscsi_start_session_recovery(struct iscsi_session *session,
2805 struct iscsi_conn *conn, int flag)
7996a778 2806{
ed2abc7f
MC		 2807 int old_stop_stage;
2808
6724add1 2809 mutex_lock(&session->eh_mutex);
7996a778 2810 spin_lock_bh(&session->lock);
ed2abc7f 2811 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2812 spin_unlock_bh(&session->lock);
6724add1
MC		 2813 mutex_unlock(&session->eh_mutex);
2814 return;
2815 }
2816
ed2abc7f
MC		 2817 /*
2818 * When this is called for the in_login state, we only want to clean
9c19a7d0 2819 * up the login task and connection. We do not need to block and set
67a61114 2820 * the recovery state again
ed2abc7f 2821 */
67a61114
MC		 2822 if (flag == STOP_CONN_TERM)
2823 session->state = ISCSI_STATE_TERMINATE;
2824 else if (conn->stop_stage != STOP_CONN_RECOVER)
2825 session->state = ISCSI_STATE_IN_RECOVERY;
26013ad4 2826 spin_unlock_bh(&session->lock);
ed2abc7f 2827
26013ad4
MC		 2828 del_timer_sync(&conn->transport_timer);
2829 iscsi_suspend_tx(conn);
2830
2831 spin_lock_bh(&session->lock);
ed2abc7f 2832 old_stop_stage = conn->stop_stage;
7996a778 2833 conn->stop_stage = flag;
67a61114 2834 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2835 spin_unlock_bh(&session->lock);
6724add1 2836
7996a778
MC		 2837 /*
2838 * for connection level recovery we should not calculate
2839 * header digest. conn->hdr_size used for optimization
2840 * in hdr_extract() and will be re-negotiated at
2841 * set_param() time.
2842 */
2843 if (flag == STOP_CONN_RECOVER) {
2844 conn->hdrdgst_en = 0;
2845 conn->datadgst_en = 0;
656cffc9 2846 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114 2847 old_stop_stage != STOP_CONN_RECOVER) {
1b2c7af8 2848 ISCSI_DBG_SESSION(session, "blocking session\n");
75613521 2849 iscsi_block_session(session->cls_session);
67a61114 2850 }
7996a778 2851 }
656cffc9 2852
656cffc9
MC		 2853 /*
2854 * flush queues.
2855 */
2856 spin_lock_bh(&session->lock);
b3cd5050 2857 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3bbaaad9 2858 fail_mgmt_tasks(session, conn);
656cffc9 2859 spin_unlock_bh(&session->lock);
6724add1 2860 mutex_unlock(&session->eh_mutex);
7996a778 2861}
7996a778
MC		 2862
2863void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2864{
2865 struct iscsi_conn *conn = cls_conn->dd_data;
2866 struct iscsi_session *session = conn->session;
2867
2868 switch (flag) {
2869 case STOP_CONN_RECOVER:
2870 case STOP_CONN_TERM:
2871 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2872 break;
7996a778 2873 default:
322d739d
MC		 2874 iscsi_conn_printk(KERN_ERR, conn,
2875 "invalid stop flag %d\n", flag);
7996a778
MC		 2876 }
2877}
2878EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2879
2880int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2881 struct iscsi_cls_conn *cls_conn, int is_leading)
2882{
75613521 2883 struct iscsi_session *session = cls_session->dd_data;
98644047 2884 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2885
7996a778 2886 spin_lock_bh(&session->lock);
7996a778
MC		 2887 if (is_leading)
2888 session->leadconn = conn;
98644047 2889 spin_unlock_bh(&session->lock);
7996a778
MC		 2890
2891 /*
2892 * Unblock xmitworker(), Login Phase will pass through.
2893 */
2894 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2895 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2896 return 0;
2897}
2898EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2899
5700b1af
MC		 2900static int iscsi_switch_str_param(char **param, char *new_val_buf)
2901{
2902 char *new_val;
2903
2904 if (*param) {
2905 if (!strcmp(*param, new_val_buf))
2906 return 0;
2907 }
2908
2909 new_val = kstrdup(new_val_buf, GFP_NOIO);
2910 if (!new_val)
2911 return -ENOMEM;
2912
2913 kfree(*param);
2914 *param = new_val;
2915 return 0;
2916}
a54a52ca
MC		 2917
2918int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2919 enum iscsi_param param, char *buf, int buflen)
2920{
2921 struct iscsi_conn *conn = cls_conn->dd_data;
2922 struct iscsi_session *session = conn->session;
2923 uint32_t value;
2924
2925 switch(param) {
843c0a8a
MC		 2926 case ISCSI_PARAM_FAST_ABORT:
2927 sscanf(buf, "%d", &session->fast_abort);
2928 break;
f6d5180c
MC		 2929 case ISCSI_PARAM_ABORT_TMO:
2930 sscanf(buf, "%d", &session->abort_timeout);
2931 break;
2932 case ISCSI_PARAM_LU_RESET_TMO:
2933 sscanf(buf, "%d", &session->lu_reset_timeout);
2934 break;
2935 case ISCSI_PARAM_PING_TMO:
2936 sscanf(buf, "%d", &conn->ping_timeout);
2937 break;
2938 case ISCSI_PARAM_RECV_TMO:
2939 sscanf(buf, "%d", &conn->recv_timeout);
2940 break;
a54a52ca
MC		 2941 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2942 sscanf(buf, "%d", &conn->max_recv_dlength);
2943 break;
2944 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2945 sscanf(buf, "%d", &conn->max_xmit_dlength);
2946 break;
2947 case ISCSI_PARAM_HDRDGST_EN:
2948 sscanf(buf, "%d", &conn->hdrdgst_en);
2949 break;
2950 case ISCSI_PARAM_DATADGST_EN:
2951 sscanf(buf, "%d", &conn->datadgst_en);
2952 break;
2953 case ISCSI_PARAM_INITIAL_R2T_EN:
2954 sscanf(buf, "%d", &session->initial_r2t_en);
2955 break;
2956 case ISCSI_PARAM_MAX_R2T:
2957 sscanf(buf, "%d", &session->max_r2t);
2958 break;
2959 case ISCSI_PARAM_IMM_DATA_EN:
2960 sscanf(buf, "%d", &session->imm_data_en);
2961 break;
2962 case ISCSI_PARAM_FIRST_BURST:
2963 sscanf(buf, "%d", &session->first_burst);
2964 break;
2965 case ISCSI_PARAM_MAX_BURST:
2966 sscanf(buf, "%d", &session->max_burst);
2967 break;
2968 case ISCSI_PARAM_PDU_INORDER_EN:
2969 sscanf(buf, "%d", &session->pdu_inorder_en);
2970 break;
2971 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2972 sscanf(buf, "%d", &session->dataseq_inorder_en);
2973 break;
2974 case ISCSI_PARAM_ERL:
2975 sscanf(buf, "%d", &session->erl);
2976 break;
2977 case ISCSI_PARAM_IFMARKER_EN:
2978 sscanf(buf, "%d", &value);
2979 BUG_ON(value);
2980 break;
2981 case ISCSI_PARAM_OFMARKER_EN:
2982 sscanf(buf, "%d", &value);
2983 BUG_ON(value);
2984 break;
2985 case ISCSI_PARAM_EXP_STATSN:
2986 sscanf(buf, "%u", &conn->exp_statsn);
2987 break;
b2c64167 2988 case ISCSI_PARAM_USERNAME:
5700b1af 2989 return iscsi_switch_str_param(&session->username, buf);
b2c64167 2990 case ISCSI_PARAM_USERNAME_IN:
5700b1af 2991 return iscsi_switch_str_param(&session->username_in, buf);
b2c64167 2992 case ISCSI_PARAM_PASSWORD:
5700b1af 2993 return iscsi_switch_str_param(&session->password, buf);
b2c64167 2994 case ISCSI_PARAM_PASSWORD_IN:
5700b1af 2995 return iscsi_switch_str_param(&session->password_in, buf);
a54a52ca 2996 case ISCSI_PARAM_TARGET_NAME:
5700b1af 2997 return iscsi_switch_str_param(&session->targetname, buf);
a54a52ca
MC		 2998 case ISCSI_PARAM_TPGT:
2999 sscanf(buf, "%d", &session->tpgt);
3000 break;
3001 case ISCSI_PARAM_PERSISTENT_PORT:
3002 sscanf(buf, "%d", &conn->persistent_port);
3003 break;
3004 case ISCSI_PARAM_PERSISTENT_ADDRESS:
5700b1af 3005 return iscsi_switch_str_param(&conn->persistent_address, buf);
88dfd340 3006 case ISCSI_PARAM_IFACE_NAME:
5700b1af 3007 return iscsi_switch_str_param(&session->ifacename, buf);
88dfd340 3008 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3009 return iscsi_switch_str_param(&session->initiatorname, buf);
a54a52ca
MC		 3010 default:
3011 return -ENOSYS;
3012 }
3013
3014 return 0;
3015}
3016EXPORT_SYMBOL_GPL(iscsi_set_param);
3017
3018int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3019 enum iscsi_param param, char *buf)
3020{
75613521 3021 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 3022 int len;
3023
3024 switch(param) {
843c0a8a
MC		 3025 case ISCSI_PARAM_FAST_ABORT:
3026 len = sprintf(buf, "%d\n", session->fast_abort);
3027 break;
f6d5180c
MC		 3028 case ISCSI_PARAM_ABORT_TMO:
3029 len = sprintf(buf, "%d\n", session->abort_timeout);
3030 break;
3031 case ISCSI_PARAM_LU_RESET_TMO:
3032 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3033 break;
a54a52ca
MC		 3034 case ISCSI_PARAM_INITIAL_R2T_EN:
3035 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3036 break;
3037 case ISCSI_PARAM_MAX_R2T:
3038 len = sprintf(buf, "%hu\n", session->max_r2t);
3039 break;
3040 case ISCSI_PARAM_IMM_DATA_EN:
3041 len = sprintf(buf, "%d\n", session->imm_data_en);
3042 break;
3043 case ISCSI_PARAM_FIRST_BURST:
3044 len = sprintf(buf, "%u\n", session->first_burst);
3045 break;
3046 case ISCSI_PARAM_MAX_BURST:
3047 len = sprintf(buf, "%u\n", session->max_burst);
3048 break;
3049 case ISCSI_PARAM_PDU_INORDER_EN:
3050 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3051 break;
3052 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3053 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3054 break;
3055 case ISCSI_PARAM_ERL:
3056 len = sprintf(buf, "%d\n", session->erl);
3057 break;
3058 case ISCSI_PARAM_TARGET_NAME:
3059 len = sprintf(buf, "%s\n", session->targetname);
3060 break;
3061 case ISCSI_PARAM_TPGT:
3062 len = sprintf(buf, "%d\n", session->tpgt);
3063 break;
b2c64167
MC		 3064 case ISCSI_PARAM_USERNAME:
3065 len = sprintf(buf, "%s\n", session->username);
3066 break;
3067 case ISCSI_PARAM_USERNAME_IN:
3068 len = sprintf(buf, "%s\n", session->username_in);
3069 break;
3070 case ISCSI_PARAM_PASSWORD:
3071 len = sprintf(buf, "%s\n", session->password);
3072 break;
3073 case ISCSI_PARAM_PASSWORD_IN:
3074 len = sprintf(buf, "%s\n", session->password_in);
3075 break;
88dfd340
MC		 3076 case ISCSI_PARAM_IFACE_NAME:
3077 len = sprintf(buf, "%s\n", session->ifacename);
3078 break;
3079 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3080 len = sprintf(buf, "%s\n", session->initiatorname);
88dfd340 3081 break;
a54a52ca
MC		 3082 default:
3083 return -ENOSYS;
3084 }
3085
3086 return len;
3087}
3088EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3089
3090int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3091 enum iscsi_param param, char *buf)
3092{
3093 struct iscsi_conn *conn = cls_conn->dd_data;
3094 int len;
3095
3096 switch(param) {
f6d5180c
MC		 3097 case ISCSI_PARAM_PING_TMO:
3098 len = sprintf(buf, "%u\n", conn->ping_timeout);
3099 break;
3100 case ISCSI_PARAM_RECV_TMO:
3101 len = sprintf(buf, "%u\n", conn->recv_timeout);
3102 break;
a54a52ca
MC		 3103 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3104 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3105 break;
3106 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3107 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3108 break;
3109 case ISCSI_PARAM_HDRDGST_EN:
3110 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3111 break;
3112 case ISCSI_PARAM_DATADGST_EN:
3113 len = sprintf(buf, "%d\n", conn->datadgst_en);
3114 break;
3115 case ISCSI_PARAM_IFMARKER_EN:
3116 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3117 break;
3118 case ISCSI_PARAM_OFMARKER_EN:
3119 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3120 break;
3121 case ISCSI_PARAM_EXP_STATSN:
3122 len = sprintf(buf, "%u\n", conn->exp_statsn);
3123 break;
3124 case ISCSI_PARAM_PERSISTENT_PORT:
3125 len = sprintf(buf, "%d\n", conn->persistent_port);
3126 break;
3127 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3128 len = sprintf(buf, "%s\n", conn->persistent_address);
3129 break;
3130 default:
3131 return -ENOSYS;
3132 }
3133
3134 return len;
3135}
3136EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3137
0801c242
MC		 3138int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3139 char *buf)
3140{
75613521 3141 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3142 int len;
3143
3144 switch (param) {
d8196ed2 3145 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3146 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 3147 break;
0801c242 3148 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3149 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 3150 break;
8ad5781a 3151 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3152 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 3153 break;
75613521 3154 case ISCSI_HOST_PARAM_IPADDRESS:
5700b1af 3155 len = sprintf(buf, "%s\n", ihost->local_address);
88dfd340 3156 break;
0801c242
MC		 3157 default:
3158 return -ENOSYS;
3159 }
3160
3161 return len;
3162}
3163EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3164
3165int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3166 char *buf, int buflen)
3167{
75613521 3168 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3169
3170 switch (param) {
d8196ed2 3171 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3172 return iscsi_switch_str_param(&ihost->netdev, buf);
0801c242 3173 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3174 return iscsi_switch_str_param(&ihost->hwaddress, buf);
8ad5781a 3175 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3176 return iscsi_switch_str_param(&ihost->initiatorname, buf);
0801c242
MC		 3177 default:
3178 return -ENOSYS;
3179 }
3180
3181 return 0;
3182}
3183EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3184
7996a778
MC		 3185MODULE_AUTHOR("Mike Christie");
3186MODULE_DESCRIPTION("iSCSI library functions");
3187MODULE_LICENSE("GPL");
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