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