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[SCSI] iscsi class: fix endpoint id handling
[mirror_ubuntu-bionic-kernel.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
77a23c21
MC		 41/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
42#define SNA32_CHECK 2147483648UL
7996a778 43
77a23c21
MC		 44static int iscsi_sna_lt(u32 n1, u32 n2)
45{
46 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
47 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
48}
49
50/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
51static int iscsi_sna_lte(u32 n1, u32 n2)
52{
53 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
55}
56
57void
58iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
7996a778
MC		 59{
60 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
61 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
62
77a23c21
MC		 63 /*
64 * standard specifies this check for when to update expected and
65 * max sequence numbers
66 */
67 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
68 return;
69
70 if (exp_cmdsn != session->exp_cmdsn &&
71 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 72 session->exp_cmdsn = exp_cmdsn;
73
77a23c21
MC		 74 if (max_cmdsn != session->max_cmdsn &&
75 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
76 session->max_cmdsn = max_cmdsn;
77 /*
78 * if the window closed with IO queued, then kick the
79 * xmit thread
80 */
81 if (!list_empty(&session->leadconn->xmitqueue) ||
052d0144
MC		 82 !list_empty(&session->leadconn->mgmtqueue)) {
83 if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD))
84 scsi_queue_work(session->host,
85 &session->leadconn->xmitwork);
86 }
77a23c21 87 }
7996a778 88}
77a23c21 89EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 90
9c19a7d0 91void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *task,
ffd0436e 92 struct iscsi_data *hdr)
7996a778 93{
9c19a7d0 94 struct iscsi_conn *conn = task->conn;
7996a778
MC		 95
96 memset(hdr, 0, sizeof(struct iscsi_data));
97 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
9c19a7d0
MC		 98 hdr->datasn = cpu_to_be32(task->unsol_datasn);
99 task->unsol_datasn++;
7996a778 100 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
9c19a7d0 101 memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
7996a778 102
9c19a7d0 103 hdr->itt = task->hdr->itt;
7996a778 104 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
9c19a7d0 105 hdr->offset = cpu_to_be32(task->unsol_offset);
7996a778 106
9c19a7d0 107 if (task->unsol_count > conn->max_xmit_dlength) {
7996a778 108 hton24(hdr->dlength, conn->max_xmit_dlength);
9c19a7d0
MC		 109 task->data_count = conn->max_xmit_dlength;
110 task->unsol_offset += task->data_count;
7996a778
MC		 111 hdr->flags = 0;
112 } else {
9c19a7d0
MC		 113 hton24(hdr->dlength, task->unsol_count);
114 task->data_count = task->unsol_count;
7996a778
MC		 115 hdr->flags = ISCSI_FLAG_CMD_FINAL;
116 }
117}
118EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
119
9c19a7d0 120static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 121{
9c19a7d0 122 unsigned exp_len = task->hdr_len + len;
004d6530 123
9c19a7d0 124 if (exp_len > task->hdr_max) {
004d6530
BH		 125 WARN_ON(1);
126 return -EINVAL;
127 }
128
129 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 130 task->hdr_len = exp_len;
004d6530
BH		 131 return 0;
132}
133
38d1c069
BH		 134/*
135 * make an extended cdb AHS
136 */
9c19a7d0 137static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 138{
9c19a7d0 139 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 140 unsigned rlen, pad_len;
141 unsigned short ahslength;
142 struct iscsi_ecdb_ahdr *ecdb_ahdr;
143 int rc;
144
9c19a7d0 145 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 146 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
147
148 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
149 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
150
151 pad_len = iscsi_padding(rlen);
152
9c19a7d0 153 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 154 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
155 if (rc)
156 return rc;
157
158 if (pad_len)
159 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
160
161 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
162 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
163 ecdb_ahdr->reserved = 0;
164 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
165
166 debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
167 "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
9c19a7d0 168 cmd->cmd_len, rlen, pad_len, ahslength, task->hdr_len);
38d1c069
BH		 169
170 return 0;
171}
172
9c19a7d0 173static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
c07d4444 174{
9c19a7d0 175 struct scsi_cmnd *sc = task->sc;
c07d4444
BH		 176 struct iscsi_rlength_ahdr *rlen_ahdr;
177 int rc;
178
9c19a7d0
MC		 179 rlen_ahdr = iscsi_next_hdr(task);
180 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
c07d4444
BH		 181 if (rc)
182 return rc;
183
184 rlen_ahdr->ahslength =
185 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
186 sizeof(rlen_ahdr->reserved));
187 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
188 rlen_ahdr->reserved = 0;
189 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
190
191 debug_scsi("bidi-in rlen_ahdr->read_length(%d) "
192 "rlen_ahdr->ahslength(%d)\n",
193 be32_to_cpu(rlen_ahdr->read_length),
194 be16_to_cpu(rlen_ahdr->ahslength));
195 return 0;
196}
197
7996a778
MC		 198/**
199 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 200 * @task: iscsi task
7996a778
MC		 201 *
202 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
203 * fields like dlength or final based on how much data it sends
204 */
9c19a7d0 205static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 206{
9c19a7d0 207 struct iscsi_conn *conn = task->conn;
7996a778 208 struct iscsi_session *session = conn->session;
9c19a7d0
MC		 209 struct iscsi_cmd *hdr = task->hdr;
210 struct scsi_cmnd *sc = task->sc;
38d1c069 211 unsigned hdrlength, cmd_len;
004d6530 212 int rc;
7996a778 213
9c19a7d0
MC		 214 task->hdr_len = 0;
215 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 216 if (rc)
217 return rc;
a8ac6311
OK		 218 hdr->opcode = ISCSI_OP_SCSI_CMD;
219 hdr->flags = ISCSI_ATTR_SIMPLE;
220 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
9c19a7d0 221 hdr->itt = build_itt(task->itt, session->age);
a8ac6311
OK		 222 hdr->cmdsn = cpu_to_be32(session->cmdsn);
223 session->cmdsn++;
224 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 225 cmd_len = sc->cmd_len;
226 if (cmd_len < ISCSI_CDB_SIZE)
227 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
228 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 229 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 230 if (rc)
231 return rc;
232 cmd_len = ISCSI_CDB_SIZE;
233 }
234 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 235
9c19a7d0 236 task->imm_count = 0;
c07d4444
BH		 237 if (scsi_bidi_cmnd(sc)) {
238 hdr->flags |= ISCSI_FLAG_CMD_READ;
9c19a7d0 239 rc = iscsi_prep_bidi_ahs(task);
c07d4444
BH		 240 if (rc)
241 return rc;
242 }
7996a778 243 if (sc->sc_data_direction == DMA_TO_DEVICE) {
c07d4444
BH		 244 unsigned out_len = scsi_out(sc)->length;
245 hdr->data_length = cpu_to_be32(out_len);
7996a778
MC		 246 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
247 /*
248 * Write counters:
249 *
250 * imm_count bytes to be sent right after
251 * SCSI PDU Header
252 *
253 * unsol_count bytes(as Data-Out) to be sent
254 * without R2T ack right after
255 * immediate data
256 *
257 * r2t_data_count bytes to be sent via R2T ack's
258 *
259 * pad_count bytes to be sent as zero-padding
260 */
9c19a7d0
MC		 261 task->unsol_count = 0;
262 task->unsol_offset = 0;
263 task->unsol_datasn = 0;
7996a778
MC		 264
265 if (session->imm_data_en) {
c07d4444 266 if (out_len >= session->first_burst)
9c19a7d0 267 task->imm_count = min(session->first_burst,
7996a778
MC		 268 conn->max_xmit_dlength);
269 else
9c19a7d0 270 task->imm_count = min(out_len,
7996a778 271 conn->max_xmit_dlength);
9c19a7d0 272 hton24(hdr->dlength, task->imm_count);
7996a778 273 } else
a8ac6311 274 zero_data(hdr->dlength);
7996a778 275
ffd0436e 276 if (!session->initial_r2t_en) {
9c19a7d0
MC		 277 task->unsol_count = min(session->first_burst, out_len)
278 - task->imm_count;
279 task->unsol_offset = task->imm_count;
ffd0436e
MC		 280 }
281
9c19a7d0 282 if (!task->unsol_count)
7996a778 283 /* No unsolicit Data-Out's */
a8ac6311 284 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 285 } else {
7996a778
MC		 286 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
287 zero_data(hdr->dlength);
c07d4444 288 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
7996a778
MC		 289
290 if (sc->sc_data_direction == DMA_FROM_DEVICE)
291 hdr->flags |= ISCSI_FLAG_CMD_READ;
292 }
293
004d6530 294 /* calculate size of additional header segments (AHSs) */
9c19a7d0 295 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 296
297 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
298 hdrlength /= ISCSI_PAD_LEN;
299
300 WARN_ON(hdrlength >= 256);
301 hdr->hlength = hdrlength & 0xFF;
302
3e5c28ad 303 if (conn->session->tt->init_task &&
9c19a7d0 304 conn->session->tt->init_task(task))
052d0144
MC		 305 return -EIO;
306
9c19a7d0
MC		 307 task->state = ISCSI_TASK_RUNNING;
308 list_move_tail(&task->running, &conn->run_list);
77a23c21 309
a8ac6311 310 conn->scsicmd_pdus_cnt++;
3e5c28ad
MC		 311 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
312 "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc) ?
313 "bidirectional" : sc->sc_data_direction == DMA_TO_DEVICE ?
9c19a7d0 314 "write" : "read", conn->id, sc, sc->cmnd[0], task->itt,
3e5c28ad
MC		 315 scsi_bufflen(sc),
316 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
317 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 318 return 0;
7996a778 319}
7996a778
MC		 320
321/**
3e5c28ad 322 * iscsi_complete_command - finish a task
9c19a7d0 323 * @task: iscsi cmd task
7996a778
MC		 324 *
325 * Must be called with session lock.
3e5c28ad
MC		 326 * This function returns the scsi command to scsi-ml or cleans
327 * up mgmt tasks then returns the task to the pool.
7996a778 328 */
9c19a7d0 329static void iscsi_complete_command(struct iscsi_task *task)
7996a778 330{
9c19a7d0 331 struct iscsi_conn *conn = task->conn;
c1635cb7 332 struct iscsi_session *session = conn->session;
9c19a7d0 333 struct scsi_cmnd *sc = task->sc;
7996a778 334
9c19a7d0
MC		 335 list_del_init(&task->running);
336 task->state = ISCSI_TASK_COMPLETED;
337 task->sc = NULL;
3e5c28ad 338
9c19a7d0
MC		 339 if (conn->task == task)
340 conn->task = NULL;
3e5c28ad 341 /*
9c19a7d0 342 * login task is preallocated so do not free
3e5c28ad 343 */
9c19a7d0 344 if (conn->login_task == task)
3e5c28ad
MC		 345 return;
346
9c19a7d0 347 __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 348
9c19a7d0
MC		 349 if (conn->ping_task == task)
350 conn->ping_task = NULL;
3e5c28ad
MC		 351
352 if (sc) {
9c19a7d0 353 task->sc = NULL;
3e5c28ad
MC		 354 /* SCSI eh reuses commands to verify us */
355 sc->SCp.ptr = NULL;
356 /*
357 * queue command may call this to free the task, but
358 * not have setup the sc callback
359 */
360 if (sc->scsi_done)
361 sc->scsi_done(sc);
362 }
7996a778
MC		 363}
364
913e5bf4 365void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 366{
9c19a7d0 367 atomic_inc(&task->refcount);
60ecebf5 368}
913e5bf4 369EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 370
9c19a7d0 371static void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 372{
9c19a7d0
MC		 373 if (atomic_dec_and_test(&task->refcount))
374 iscsi_complete_command(task);
60ecebf5
MC		 375}
376
9c19a7d0 377void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 378{
9c19a7d0 379 struct iscsi_session *session = task->conn->session;
3e5c28ad
MC		 380
381 spin_lock_bh(&session->lock);
9c19a7d0 382 __iscsi_put_task(task);
3e5c28ad
MC		 383 spin_unlock_bh(&session->lock);
384}
9c19a7d0 385EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 386
b3a7ea8d
MC		 387/*
388 * session lock must be held
389 */
9c19a7d0 390static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task,
b3a7ea8d
MC		 391 int err)
392{
393 struct scsi_cmnd *sc;
394
9c19a7d0 395 sc = task->sc;
b3a7ea8d
MC		 396 if (!sc)
397 return;
398
9c19a7d0 399 if (task->state == ISCSI_TASK_PENDING)
b3a7ea8d
MC		 400 /*
401 * cmd never made it to the xmit thread, so we should not count
402 * the cmd in the sequencing
403 */
404 conn->session->queued_cmdsn--;
405 else
9c19a7d0 406 conn->session->tt->cleanup_task(conn, task);
913e5bf4
MC		 407 /*
408 * Check if cleanup_task dropped the lock and the command completed,
409 */
410 if (!task->sc)
411 return;
b3a7ea8d
MC		 412
413 sc->result = err;
c07d4444
BH		 414 if (!scsi_bidi_cmnd(sc))
415 scsi_set_resid(sc, scsi_bufflen(sc));
416 else {
417 scsi_out(sc)->resid = scsi_out(sc)->length;
418 scsi_in(sc)->resid = scsi_in(sc)->length;
419 }
3e5c28ad 420
9c19a7d0
MC		 421 if (conn->task == task)
422 conn->task = NULL;
b3a7ea8d 423 /* release ref from queuecommand */
9c19a7d0 424 __iscsi_put_task(task);
b3a7ea8d
MC		 425}
426
3e5c28ad 427static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 428 struct iscsi_task *task)
052d0144
MC		 429{
430 struct iscsi_session *session = conn->session;
9c19a7d0 431 struct iscsi_hdr *hdr = (struct iscsi_hdr *)task->hdr;
052d0144
MC		 432 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
433
434 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
435 return -ENOTCONN;
436
437 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
438 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
439 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
440 /*
441 * pre-format CmdSN for outgoing PDU.
442 */
443 nop->cmdsn = cpu_to_be32(session->cmdsn);
444 if (hdr->itt != RESERVED_ITT) {
9c19a7d0 445 hdr->itt = build_itt(task->itt, session->age);
052d0144
MC		 446 /*
447 * TODO: We always use immediate, so we never hit this.
448 * If we start to send tmfs or nops as non-immediate then
449 * we should start checking the cmdsn numbers for mgmt tasks.
450 */
451 if (conn->c_stage == ISCSI_CONN_STARTED &&
452 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
453 session->queued_cmdsn++;
454 session->cmdsn++;
455 }
456 }
457
3e5c28ad 458 if (session->tt->init_task)
9c19a7d0 459 session->tt->init_task(task);
052d0144
MC		 460
461 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
462 session->state = ISCSI_STATE_LOGGING_OUT;
463
9c19a7d0 464 list_move_tail(&task->running, &conn->mgmt_run_list);
052d0144
MC		 465 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
466 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
9c19a7d0 467 task->data_count);
052d0144
MC		 468 return 0;
469}
470
9c19a7d0 471static struct iscsi_task *
f6d5180c
MC		 472__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
473 char *data, uint32_t data_size)
474{
475 struct iscsi_session *session = conn->session;
9c19a7d0 476 struct iscsi_task *task;
f6d5180c
MC		 477
478 if (session->state == ISCSI_STATE_TERMINATE)
479 return NULL;
480
481 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
482 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
483 /*
484 * Login and Text are sent serially, in
485 * request-followed-by-response sequence.
3e5c28ad
MC		 486 * Same task can be used. Same ITT must be used.
487 * Note that login_task is preallocated at conn_create().
f6d5180c 488 */
9c19a7d0 489 task = conn->login_task;
f6d5180c
MC		 490 else {
491 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
492 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
493
3e5c28ad 494 if (!__kfifo_get(session->cmdpool.queue,
9c19a7d0 495 (void*)&task, sizeof(void*)))
f6d5180c 496 return NULL;
052d0144
MC		 497
498 if ((hdr->opcode == (ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE)) &&
499 hdr->ttt == RESERVED_ITT) {
9c19a7d0 500 conn->ping_task = task;
052d0144
MC		 501 conn->last_ping = jiffies;
502 }
f6d5180c 503 }
3e5c28ad
MC		 504 /*
505 * released in complete pdu for task we expect a response for, and
506 * released by the lld when it has transmitted the task for
507 * pdus we do not expect a response for.
508 */
9c19a7d0
MC		 509 atomic_set(&task->refcount, 1);
510 task->conn = conn;
511 task->sc = NULL;
f6d5180c
MC		 512
513 if (data_size) {
9c19a7d0
MC		 514 memcpy(task->data, data, data_size);
515 task->data_count = data_size;
f6d5180c 516 } else
9c19a7d0 517 task->data_count = 0;
f6d5180c 518
9c19a7d0
MC		 519 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
520 INIT_LIST_HEAD(&task->running);
521 list_add_tail(&task->running, &conn->mgmtqueue);
052d0144
MC		 522
523 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
9c19a7d0
MC		 524 if (iscsi_prep_mgmt_task(conn, task)) {
525 __iscsi_put_task(task);
052d0144
MC		 526 return NULL;
527 }
528
9c19a7d0
MC		 529 if (session->tt->xmit_task(task))
530 task = NULL;
052d0144
MC		 531
532 } else
533 scsi_queue_work(conn->session->host, &conn->xmitwork);
534
9c19a7d0 535 return task;
f6d5180c
MC		 536}
537
538int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
539 char *data, uint32_t data_size)
540{
541 struct iscsi_conn *conn = cls_conn->dd_data;
542 struct iscsi_session *session = conn->session;
543 int err = 0;
544
545 spin_lock_bh(&session->lock);
546 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
547 err = -EPERM;
548 spin_unlock_bh(&session->lock);
f6d5180c
MC		 549 return err;
550}
551EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
552
7996a778
MC		 553/**
554 * iscsi_cmd_rsp - SCSI Command Response processing
555 * @conn: iscsi connection
556 * @hdr: iscsi header
9c19a7d0 557 * @task: scsi command task
7996a778
MC		 558 * @data: cmd data buffer
559 * @datalen: len of buffer
560 *
561 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
9c19a7d0 562 * then completes the command and task.
7996a778 563 **/
77a23c21 564static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 565 struct iscsi_task *task, char *data,
77a23c21 566 int datalen)
7996a778 567{
7996a778
MC		 568 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
569 struct iscsi_session *session = conn->session;
9c19a7d0 570 struct scsi_cmnd *sc = task->sc;
7996a778 571
77a23c21 572 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 573 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
574
575 sc->result = (DID_OK << 16) | rhdr->cmd_status;
576
577 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
578 sc->result = DID_ERROR << 16;
579 goto out;
580 }
581
582 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 583 uint16_t senselen;
7996a778
MC		 584
585 if (datalen < 2) {
586invalid_datalen:
322d739d
MC		 587 iscsi_conn_printk(KERN_ERR, conn,
588 "Got CHECK_CONDITION but invalid data "
589 "buffer size of %d\n", datalen);
7996a778
MC		 590 sc->result = DID_BAD_TARGET << 16;
591 goto out;
592 }
593
8f333991 594 senselen = get_unaligned_be16(data);
7996a778
MC		 595 if (datalen < senselen)
596 goto invalid_datalen;
597
598 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 599 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 600 debug_scsi("copied %d bytes of sense\n",
8eb00539 601 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 602 }
603
c07d4444
BH		 604 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
605 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
606 int res_count = be32_to_cpu(rhdr->bi_residual_count);
607
608 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
609 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
610 res_count <= scsi_in(sc)->length))
611 scsi_in(sc)->resid = res_count;
612 else
613 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
614 }
615
7207fea4
BH		 616 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
617 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 618 int res_count = be32_to_cpu(rhdr->residual_count);
619
7207fea4
BH		 620 if (res_count > 0 &&
621 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
622 res_count <= scsi_bufflen(sc)))
c07d4444 623 /* write side for bidi or uni-io set_resid */
1c138991 624 scsi_set_resid(sc, res_count);
7996a778
MC		 625 else
626 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 627 }
7996a778
MC		 628out:
629 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
9c19a7d0 630 (long)sc, sc->result, task->itt);
7996a778
MC		 631 conn->scsirsp_pdus_cnt++;
632
9c19a7d0 633 __iscsi_put_task(task);
7996a778
MC		 634}
635
1d9edf02
MC		 636/**
637 * iscsi_data_in_rsp - SCSI Data-In Response processing
638 * @conn: iscsi connection
639 * @hdr: iscsi pdu
640 * @task: scsi command task
641 **/
642static void
643iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
644 struct iscsi_task *task)
645{
646 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
647 struct scsi_cmnd *sc = task->sc;
648
649 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
650 return;
651
652 sc->result = (DID_OK << 16) | rhdr->cmd_status;
653 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
654 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
655 ISCSI_FLAG_DATA_OVERFLOW)) {
656 int res_count = be32_to_cpu(rhdr->residual_count);
657
658 if (res_count > 0 &&
659 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
660 res_count <= scsi_in(sc)->length))
661 scsi_in(sc)->resid = res_count;
662 else
663 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
664 }
665
666 conn->scsirsp_pdus_cnt++;
667 __iscsi_put_task(task);
668}
669
7ea8b828
MC		 670static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
671{
672 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
673
674 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
675 conn->tmfrsp_pdus_cnt++;
676
843c0a8a 677 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 678 return;
679
680 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 681 conn->tmf_state = TMF_SUCCESS;
7ea8b828 682 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 683 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 684 else
843c0a8a 685 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 686 wake_up(&conn->ehwait);
687}
688
f6d5180c
MC		 689static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
690{
691 struct iscsi_nopout hdr;
9c19a7d0 692 struct iscsi_task *task;
f6d5180c 693
9c19a7d0 694 if (!rhdr && conn->ping_task)
f6d5180c
MC		 695 return;
696
697 memset(&hdr, 0, sizeof(struct iscsi_nopout));
698 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
699 hdr.flags = ISCSI_FLAG_CMD_FINAL;
700
701 if (rhdr) {
702 memcpy(hdr.lun, rhdr->lun, 8);
703 hdr.ttt = rhdr->ttt;
704 hdr.itt = RESERVED_ITT;
705 } else
706 hdr.ttt = RESERVED_ITT;
707
9c19a7d0
MC		 708 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
709 if (!task)
322d739d 710 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
f6d5180c
MC		 711}
712
62f38300
MC		 713static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
714 char *data, int datalen)
715{
716 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
717 struct iscsi_hdr rejected_pdu;
718 uint32_t itt;
719
720 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
721
722 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
723 if (ntoh24(reject->dlength) > datalen)
724 return ISCSI_ERR_PROTO;
725
726 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
727 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 728 itt = get_itt(rejected_pdu.itt);
322d739d
MC		 729 iscsi_conn_printk(KERN_ERR, conn,
730 "itt 0x%x had pdu (op 0x%x) rejected "
731 "due to DataDigest error.\n", itt,
732 rejected_pdu.opcode);
62f38300
MC		 733 }
734 }
735 return 0;
736}
737
913e5bf4
MC		 738/**
739 * iscsi_itt_to_task - look up task by itt
740 * @conn: iscsi connection
741 * @itt: itt
742 *
743 * This should be used for mgmt tasks like login and nops, or if
744 * the LDD's itt space does not include the session age.
745 *
746 * The session lock must be held.
747 */
748static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
749{
750 struct iscsi_session *session = conn->session;
751 uint32_t i;
752
753 if (itt == RESERVED_ITT)
754 return NULL;
755
756 i = get_itt(itt);
757 if (i >= session->cmds_max)
758 return NULL;
759
760 return session->cmds[i];
761}
762
7996a778
MC		 763/**
764 * __iscsi_complete_pdu - complete pdu
765 * @conn: iscsi conn
766 * @hdr: iscsi header
767 * @data: data buffer
768 * @datalen: len of data buffer
769 *
770 * Completes pdu processing by freeing any resources allocated at
771 * queuecommand or send generic. session lock must be held and verify
772 * itt must have been called.
773 */
913e5bf4
MC		 774int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
775 char *data, int datalen)
7996a778
MC		 776{
777 struct iscsi_session *session = conn->session;
778 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 779 struct iscsi_task *task;
7996a778
MC		 780 uint32_t itt;
781
f6d5180c 782 conn->last_recv = jiffies;
0af967f5
MC		 783 rc = iscsi_verify_itt(conn, hdr->itt);
784 if (rc)
785 return rc;
786
b4377356
AV		 787 if (hdr->itt != RESERVED_ITT)
788 itt = get_itt(hdr->itt);
7996a778 789 else
b4377356 790 itt = ~0U;
7996a778 791
3e5c28ad
MC		 792 debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n",
793 opcode, conn->id, itt, datalen);
7996a778 794
3e5c28ad 795 if (itt == ~0U) {
77a23c21 796 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 797
7996a778
MC		 798 switch(opcode) {
799 case ISCSI_OP_NOOP_IN:
40527afe 800 if (datalen) {
7996a778 801 rc = ISCSI_ERR_PROTO;
40527afe
MC		 802 break;
803 }
804
b4377356 805 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 806 break;
807
f6d5180c 808 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 809 break;
810 case ISCSI_OP_REJECT:
62f38300
MC		 811 rc = iscsi_handle_reject(conn, hdr, data, datalen);
812 break;
7996a778 813 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 814 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 815 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
816 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 817 break;
818 default:
819 rc = ISCSI_ERR_BAD_OPCODE;
820 break;
821 }
3e5c28ad
MC		 822 goto out;
823 }
824
3e5c28ad
MC		 825 switch(opcode) {
826 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 827 case ISCSI_OP_SCSI_DATA_IN:
828 task = iscsi_itt_to_ctask(conn, hdr->itt);
829 if (!task)
830 return ISCSI_ERR_BAD_ITT;
831 break;
832 case ISCSI_OP_R2T:
833 /*
834 * LLD handles R2Ts if they need to.
835 */
836 return 0;
837 case ISCSI_OP_LOGOUT_RSP:
838 case ISCSI_OP_LOGIN_RSP:
839 case ISCSI_OP_TEXT_RSP:
840 case ISCSI_OP_SCSI_TMFUNC_RSP:
841 case ISCSI_OP_NOOP_IN:
842 task = iscsi_itt_to_task(conn, hdr->itt);
843 if (!task)
844 return ISCSI_ERR_BAD_ITT;
845 break;
846 default:
847 return ISCSI_ERR_BAD_OPCODE;
848 }
849
850 switch(opcode) {
851 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 852 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 853 break;
854 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 855 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 856 break;
3e5c28ad
MC		 857 case ISCSI_OP_LOGOUT_RSP:
858 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
859 if (datalen) {
860 rc = ISCSI_ERR_PROTO;
861 break;
862 }
863 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
864 goto recv_pdu;
865 case ISCSI_OP_LOGIN_RSP:
866 case ISCSI_OP_TEXT_RSP:
867 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
868 /*
869 * login related PDU's exp_statsn is handled in
870 * userspace
871 */
872 goto recv_pdu;
873 case ISCSI_OP_SCSI_TMFUNC_RSP:
874 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
875 if (datalen) {
876 rc = ISCSI_ERR_PROTO;
877 break;
878 }
879
880 iscsi_tmf_rsp(conn, hdr);
9c19a7d0 881 __iscsi_put_task(task);
3e5c28ad
MC		 882 break;
883 case ISCSI_OP_NOOP_IN:
884 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
885 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
886 rc = ISCSI_ERR_PROTO;
887 break;
888 }
889 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
890
9c19a7d0 891 if (conn->ping_task != task)
3e5c28ad
MC		 892 /*
893 * If this is not in response to one of our
894 * nops then it must be from userspace.
895 */
896 goto recv_pdu;
9c19a7d0
MC		 897
898 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
899 __iscsi_put_task(task);
3e5c28ad
MC		 900 break;
901 default:
902 rc = ISCSI_ERR_BAD_OPCODE;
903 break;
904 }
7996a778 905
3e5c28ad
MC		 906out:
907 return rc;
908recv_pdu:
909 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
910 rc = ISCSI_ERR_CONN_FAILED;
9c19a7d0 911 __iscsi_put_task(task);
7996a778
MC		 912 return rc;
913}
913e5bf4 914EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 915
916int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
917 char *data, int datalen)
918{
919 int rc;
920
921 spin_lock(&conn->session->lock);
922 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
923 spin_unlock(&conn->session->lock);
924 return rc;
925}
926EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
927
0af967f5 928int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 929{
930 struct iscsi_session *session = conn->session;
3e5c28ad 931 uint32_t i;
7996a778 932
0af967f5
MC		 933 if (itt == RESERVED_ITT)
934 return 0;
7996a778 935
0af967f5
MC		 936 if (((__force u32)itt & ISCSI_AGE_MASK) !=
937 (session->age << ISCSI_AGE_SHIFT)) {
938 iscsi_conn_printk(KERN_ERR, conn,
939 "received itt %x expected session age (%x)\n",
913e5bf4 940 (__force u32)itt, session->age);
0af967f5
MC		 941 return ISCSI_ERR_BAD_ITT;
942 }
7996a778 943
3e5c28ad
MC		 944 i = get_itt(itt);
945 if (i >= session->cmds_max) {
946 iscsi_conn_printk(KERN_ERR, conn,
947 "received invalid itt index %u (max cmds "
948 "%u.\n", i, session->cmds_max);
949 return ISCSI_ERR_BAD_ITT;
7996a778 950 }
7996a778
MC		 951 return 0;
952}
953EXPORT_SYMBOL_GPL(iscsi_verify_itt);
954
913e5bf4
MC		 955/**
956 * iscsi_itt_to_ctask - look up ctask by itt
957 * @conn: iscsi connection
958 * @itt: itt
959 *
960 * This should be used for cmd tasks.
961 *
962 * The session lock must be held.
963 */
964struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 965{
9c19a7d0 966 struct iscsi_task *task;
0af967f5
MC		 967
968 if (iscsi_verify_itt(conn, itt))
969 return NULL;
970
913e5bf4
MC		 971 task = iscsi_itt_to_task(conn, itt);
972 if (!task || !task->sc)
0af967f5
MC		 973 return NULL;
974
913e5bf4
MC		 975 if (task->sc->SCp.phase != conn->session->age) {
976 iscsi_session_printk(KERN_ERR, conn->session,
977 "task's session age %d, expected %d\n",
978 task->sc->SCp.phase, conn->session->age);
0af967f5 979 return NULL;
913e5bf4 980 }
0af967f5 981
9c19a7d0 982 return task;
0af967f5
MC		 983}
984EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
985
e5bd7b54
MC		 986void iscsi_session_failure(struct iscsi_cls_session *cls_session,
987 enum iscsi_err err)
988{
989 struct iscsi_session *session = cls_session->dd_data;
990 struct iscsi_conn *conn;
991 struct device *dev;
992 unsigned long flags;
993
994 spin_lock_irqsave(&session->lock, flags);
995 conn = session->leadconn;
996 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
997 spin_unlock_irqrestore(&session->lock, flags);
998 return;
999 }
1000
1001 dev = get_device(&conn->cls_conn->dev);
1002 spin_unlock_irqrestore(&session->lock, flags);
1003 if (!dev)
1004 return;
1005 /*
1006 * if the host is being removed bypass the connection
1007 * recovery initialization because we are going to kill
1008 * the session.
1009 */
1010 if (err == ISCSI_ERR_INVALID_HOST)
1011 iscsi_conn_error_event(conn->cls_conn, err);
1012 else
1013 iscsi_conn_failure(conn, err);
1014 put_device(dev);
1015}
1016EXPORT_SYMBOL_GPL(iscsi_session_failure);
1017
7996a778
MC		 1018void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1019{
1020 struct iscsi_session *session = conn->session;
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 1024 if (session->state == ISCSI_STATE_FAILED) {
1025 spin_unlock_irqrestore(&session->lock, flags);
1026 return;
1027 }
1028
67a61114 1029 if (conn->stop_stage == 0)
7996a778
MC		 1030 session->state = ISCSI_STATE_FAILED;
1031 spin_unlock_irqrestore(&session->lock, flags);
e5bd7b54 1032
7996a778
MC		 1033 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1034 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1035 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1036}
1037EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1038
77a23c21
MC		 1039static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1040{
1041 struct iscsi_session *session = conn->session;
1042
1043 /*
1044 * Check for iSCSI window and take care of CmdSN wrap-around
1045 */
e0726407
MC		 1046 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1047 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
1048 "CmdSN %u/%u\n", session->exp_cmdsn,
1049 session->max_cmdsn, session->cmdsn,
1050 session->queued_cmdsn);
77a23c21
MC		 1051 return -ENOSPC;
1052 }
1053 return 0;
1054}
1055
9c19a7d0 1056static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1057{
9c19a7d0 1058 struct iscsi_task *task = conn->task;
843c0a8a 1059 int rc;
77a23c21 1060
9c19a7d0 1061 __iscsi_get_task(task);
77a23c21 1062 spin_unlock_bh(&conn->session->lock);
9c19a7d0 1063 rc = conn->session->tt->xmit_task(task);
77a23c21 1064 spin_lock_bh(&conn->session->lock);
9c19a7d0 1065 __iscsi_put_task(task);
77a23c21 1066 if (!rc)
9c19a7d0
MC		 1067 /* done with this task */
1068 conn->task = NULL;
77a23c21
MC		 1069 return rc;
1070}
1071
843c0a8a 1072/**
9c19a7d0
MC		 1073 * iscsi_requeue_task - requeue task to run from session workqueue
1074 * @task: task to requeue
843c0a8a 1075 *
9c19a7d0 1076 * LLDs that need to run a task from the session workqueue should call
052d0144
MC		 1077 * this. The session lock must be held. This should only be called
1078 * by software drivers.
843c0a8a 1079 */
9c19a7d0 1080void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1081{
9c19a7d0 1082 struct iscsi_conn *conn = task->conn;
843c0a8a 1083
9c19a7d0 1084 list_move_tail(&task->running, &conn->requeue);
843c0a8a
MC		 1085 scsi_queue_work(conn->session->host, &conn->xmitwork);
1086}
9c19a7d0 1087EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1088
7996a778
MC		 1089/**
1090 * iscsi_data_xmit - xmit any command into the scheduled connection
1091 * @conn: iscsi connection
1092 *
1093 * Notes:
1094 * The function can return -EAGAIN in which case the caller must
1095 * re-schedule it again later or recover. '0' return code means
1096 * successful xmit.
1097 **/
1098static int iscsi_data_xmit(struct iscsi_conn *conn)
1099{
3219e529 1100 int rc = 0;
7996a778 1101
77a23c21 1102 spin_lock_bh(&conn->session->lock);
7996a778
MC		 1103 if (unlikely(conn->suspend_tx)) {
1104 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 1105 spin_unlock_bh(&conn->session->lock);
3219e529 1106 return -ENODATA;
7996a778 1107 }
7996a778 1108
9c19a7d0
MC		 1109 if (conn->task) {
1110 rc = iscsi_xmit_task(conn);
3219e529 1111 if (rc)
7996a778 1112 goto again;
7996a778
MC		 1113 }
1114
77a23c21
MC		 1115 /*
1116 * process mgmt pdus like nops before commands since we should
1117 * only have one nop-out as a ping from us and targets should not
1118 * overflow us with nop-ins
1119 */
1120check_mgmt:
843c0a8a 1121 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1122 conn->task = list_entry(conn->mgmtqueue.next,
1123 struct iscsi_task, running);
1124 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1125 __iscsi_put_task(conn->task);
1126 conn->task = NULL;
b3a7ea8d
MC		 1127 continue;
1128 }
9c19a7d0 1129 rc = iscsi_xmit_task(conn);
77a23c21
MC		 1130 if (rc)
1131 goto again;
7996a778
MC		 1132 }
1133
843c0a8a 1134 /* process pending command queue */
b6c395ed 1135 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 1136 if (conn->tmf_state == TMF_QUEUED)
1137 break;
1138
9c19a7d0
MC		 1139 conn->task = list_entry(conn->xmitqueue.next,
1140 struct iscsi_task, running);
b3a7ea8d 1141 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9c19a7d0 1142 fail_command(conn, conn->task, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 1143 continue;
1144 }
9c19a7d0
MC		 1145 if (iscsi_prep_scsi_cmd_pdu(conn->task)) {
1146 fail_command(conn, conn->task, DID_ABORT << 16);
004d6530
BH		 1147 continue;
1148 }
9c19a7d0 1149 rc = iscsi_xmit_task(conn);
77a23c21 1150 if (rc)
60ecebf5 1151 goto again;
77a23c21 1152 /*
9c19a7d0 1153 * we could continuously get new task requests so
77a23c21
MC		 1154 * we need to check the mgmt queue for nops that need to
1155 * be sent to aviod starvation
1156 */
843c0a8a
MC		 1157 if (!list_empty(&conn->mgmtqueue))
1158 goto check_mgmt;
1159 }
1160
1161 while (!list_empty(&conn->requeue)) {
1162 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1163 break;
1164
b3a7ea8d
MC		 1165 /*
1166 * we always do fastlogout - conn stop code will clean up.
1167 */
1168 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1169 break;
1170
9c19a7d0
MC		 1171 conn->task = list_entry(conn->requeue.next,
1172 struct iscsi_task, running);
1173 conn->task->state = ISCSI_TASK_RUNNING;
843c0a8a 1174 list_move_tail(conn->requeue.next, &conn->run_list);
9c19a7d0 1175 rc = iscsi_xmit_task(conn);
843c0a8a
MC		 1176 if (rc)
1177 goto again;
1178 if (!list_empty(&conn->mgmtqueue))
77a23c21 1179 goto check_mgmt;
7996a778 1180 }
b6c395ed 1181 spin_unlock_bh(&conn->session->lock);
3219e529 1182 return -ENODATA;
7996a778
MC		 1183
1184again:
1185 if (unlikely(conn->suspend_tx))
77a23c21
MC		 1186 rc = -ENODATA;
1187 spin_unlock_bh(&conn->session->lock);
3219e529 1188 return rc;
7996a778
MC		 1189}
1190
c4028958 1191static void iscsi_xmitworker(struct work_struct *work)
7996a778 1192{
c4028958
DH		 1193 struct iscsi_conn *conn =
1194 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1195 int rc;
7996a778
MC		 1196 /*
1197 * serialize Xmit worker on a per-connection basis.
1198 */
3219e529
MC		 1199 do {
1200 rc = iscsi_data_xmit(conn);
1201 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1202}
1203
1204enum {
1205 FAILURE_BAD_HOST = 1,
1206 FAILURE_SESSION_FAILED,
1207 FAILURE_SESSION_FREED,
1208 FAILURE_WINDOW_CLOSED,
60ecebf5 1209 FAILURE_OOM,
7996a778 1210 FAILURE_SESSION_TERMINATE,
656cffc9 1211 FAILURE_SESSION_IN_RECOVERY,
7996a778 1212 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1213 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1214 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1215};
1216
1217int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1218{
75613521 1219 struct iscsi_cls_session *cls_session;
7996a778
MC		 1220 struct Scsi_Host *host;
1221 int reason = 0;
1222 struct iscsi_session *session;
1223 struct iscsi_conn *conn;
9c19a7d0 1224 struct iscsi_task *task = NULL;
7996a778
MC		 1225
1226 sc->scsi_done = done;
1227 sc->result = 0;
f47f2cf5 1228 sc->SCp.ptr = NULL;
7996a778
MC		 1229
1230 host = sc->device->host;
1040c99d 1231 spin_unlock(host->host_lock);
7996a778 1232
75613521
MC		 1233 cls_session = starget_to_session(scsi_target(sc->device));
1234 session = cls_session->dd_data;
7996a778
MC		 1235 spin_lock(&session->lock);
1236
75613521 1237 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1238 if (reason) {
1239 sc->result = reason;
1240 goto fault;
1241 }
1242
656cffc9
MC		 1243 /*
1244 * ISCSI_STATE_FAILED is a temp. state. The recovery
1245 * code will decide what is best to do with command queued
1246 * during this time
1247 */
1248 if (session->state != ISCSI_STATE_LOGGED_IN &&
1249 session->state != ISCSI_STATE_FAILED) {
1250 /*
1251 * to handle the race between when we set the recovery state
1252 * and block the session we requeue here (commands could
1253 * be entering our queuecommand while a block is starting
1254 * up because the block code is not locked)
1255 */
9000bcd6
MC		 1256 switch (session->state) {
1257 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1258 reason = FAILURE_SESSION_IN_RECOVERY;
d6d13ee1 1259 goto reject;
9000bcd6
MC		 1260 case ISCSI_STATE_LOGGING_OUT:
1261 reason = FAILURE_SESSION_LOGGING_OUT;
d6d13ee1 1262 goto reject;
b3a7ea8d 1263 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1264 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1265 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1266 break;
1267 case ISCSI_STATE_TERMINATE:
656cffc9 1268 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1269 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1270 break;
b3a7ea8d 1271 default:
656cffc9 1272 reason = FAILURE_SESSION_FREED;
6eabafbe 1273 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1274 }
7996a778
MC		 1275 goto fault;
1276 }
1277
7996a778 1278 conn = session->leadconn;
98644047
MC		 1279 if (!conn) {
1280 reason = FAILURE_SESSION_FREED;
6eabafbe 1281 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1282 goto fault;
1283 }
7996a778 1284
77a23c21
MC		 1285 if (iscsi_check_cmdsn_window_closed(conn)) {
1286 reason = FAILURE_WINDOW_CLOSED;
1287 goto reject;
1288 }
1289
9c19a7d0 1290 if (!__kfifo_get(session->cmdpool.queue, (void*)&task,
60ecebf5
MC		 1291 sizeof(void*))) {
1292 reason = FAILURE_OOM;
1293 goto reject;
1294 }
7996a778 1295 sc->SCp.phase = session->age;
9c19a7d0 1296 sc->SCp.ptr = (char *)task;
7996a778 1297
9c19a7d0
MC		 1298 atomic_set(&task->refcount, 1);
1299 task->state = ISCSI_TASK_PENDING;
1300 task->conn = conn;
1301 task->sc = sc;
1302 INIT_LIST_HEAD(&task->running);
1303 list_add_tail(&task->running, &conn->xmitqueue);
7996a778 1304
052d0144 1305 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
9c19a7d0 1306 if (iscsi_prep_scsi_cmd_pdu(task)) {
052d0144
MC		 1307 sc->result = DID_ABORT << 16;
1308 sc->scsi_done = NULL;
9c19a7d0 1309 iscsi_complete_command(task);
052d0144
MC		 1310 goto fault;
1311 }
9c19a7d0 1312 if (session->tt->xmit_task(task)) {
052d0144 1313 sc->scsi_done = NULL;
9c19a7d0 1314 iscsi_complete_command(task);
052d0144
MC		 1315 reason = FAILURE_SESSION_NOT_READY;
1316 goto reject;
1317 }
1318 } else
1319 scsi_queue_work(session->host, &conn->xmitwork);
1320
1321 session->queued_cmdsn++;
1322 spin_unlock(&session->lock);
1040c99d 1323 spin_lock(host->host_lock);
7996a778
MC		 1324 return 0;
1325
1326reject:
1327 spin_unlock(&session->lock);
1328 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1040c99d 1329 spin_lock(host->host_lock);
d6d13ee1 1330 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778
MC		 1331
1332fault:
1333 spin_unlock(&session->lock);
6eabafbe 1334 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
c07d4444
BH		 1335 if (!scsi_bidi_cmnd(sc))
1336 scsi_set_resid(sc, scsi_bufflen(sc));
1337 else {
1338 scsi_out(sc)->resid = scsi_out(sc)->length;
1339 scsi_in(sc)->resid = scsi_in(sc)->length;
1340 }
052d0144 1341 done(sc);
1040c99d 1342 spin_lock(host->host_lock);
7996a778
MC		 1343 return 0;
1344}
1345EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1346
1347int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1348{
1349 if (depth > ISCSI_MAX_CMD_PER_LUN)
1350 depth = ISCSI_MAX_CMD_PER_LUN;
1351 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1352 return sdev->queue_depth;
1353}
1354EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1355
7996a778
MC		 1356void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1357{
75613521 1358 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 1359
1360 spin_lock_bh(&session->lock);
1361 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1362 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1363 if (session->leadconn)
1364 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1365 }
1366 spin_unlock_bh(&session->lock);
1367}
1368EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1369
1370int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1371{
75613521
MC		 1372 struct iscsi_cls_session *cls_session;
1373 struct iscsi_session *session;
1374 struct iscsi_conn *conn;
1375
1376 cls_session = starget_to_session(scsi_target(sc->device));
1377 session = cls_session->dd_data;
1378 conn = session->leadconn;
7996a778 1379
bc436b27 1380 mutex_lock(&session->eh_mutex);
7996a778
MC		 1381 spin_lock_bh(&session->lock);
1382 if (session->state == ISCSI_STATE_TERMINATE) {
1383failed:
1384 debug_scsi("failing host reset: session terminated "
d6e24d1c 1385 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1386 spin_unlock_bh(&session->lock);
bc436b27 1387 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1388 return FAILED;
1389 }
1390
7996a778 1391 spin_unlock_bh(&session->lock);
bc436b27 1392 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1393 /*
1394 * we drop the lock here but the leadconn cannot be destoyed while
1395 * we are in the scsi eh
1396 */
843c0a8a 1397 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1398
1399 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1400 wait_event_interruptible(conn->ehwait,
1401 session->state == ISCSI_STATE_TERMINATE ||
1402 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1403 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1404 if (signal_pending(current))
1405 flush_signals(current);
1406
bc436b27 1407 mutex_lock(&session->eh_mutex);
7996a778
MC		 1408 spin_lock_bh(&session->lock);
1409 if (session->state == ISCSI_STATE_LOGGED_IN)
322d739d
MC		 1410 iscsi_session_printk(KERN_INFO, session,
1411 "host reset succeeded\n");
7996a778
MC		 1412 else
1413 goto failed;
1414 spin_unlock_bh(&session->lock);
bc436b27 1415 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1416 return SUCCESS;
1417}
1418EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1419
843c0a8a 1420static void iscsi_tmf_timedout(unsigned long data)
7996a778 1421{
843c0a8a 1422 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1423 struct iscsi_session *session = conn->session;
1424
1425 spin_lock(&session->lock);
843c0a8a
MC		 1426 if (conn->tmf_state == TMF_QUEUED) {
1427 conn->tmf_state = TMF_TIMEDOUT;
1428 debug_scsi("tmf timedout\n");
7996a778
MC		 1429 /* unblock eh_abort() */
1430 wake_up(&conn->ehwait);
1431 }
1432 spin_unlock(&session->lock);
1433}
1434
9c19a7d0 1435static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1436 struct iscsi_tm *hdr, int age,
1437 int timeout)
7996a778 1438{
7996a778 1439 struct iscsi_session *session = conn->session;
9c19a7d0 1440 struct iscsi_task *task;
7996a778 1441
9c19a7d0 1442 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1443 NULL, 0);
9c19a7d0 1444 if (!task) {
6724add1 1445 spin_unlock_bh(&session->lock);
7996a778 1446 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1447 spin_lock_bh(&session->lock);
1448 debug_scsi("tmf exec failure\n");
77a23c21 1449 return -EPERM;
7996a778 1450 }
843c0a8a 1451 conn->tmfcmd_pdus_cnt++;
f6d5180c 1452 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1453 conn->tmf_timer.function = iscsi_tmf_timedout;
1454 conn->tmf_timer.data = (unsigned long)conn;
1455 add_timer(&conn->tmf_timer);
1456 debug_scsi("tmf set timeout\n");
7996a778 1457
7996a778 1458 spin_unlock_bh(&session->lock);
6724add1 1459 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1460
1461 /*
1462 * block eh thread until:
1463 *
843c0a8a
MC		 1464 * 1) tmf response
1465 * 2) tmf timeout
7996a778
MC		 1466 * 3) session is terminated or restarted or userspace has
1467 * given up on recovery
1468 */
843c0a8a 1469 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1470 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1471 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1472 if (signal_pending(current))
1473 flush_signals(current);
843c0a8a
MC		 1474 del_timer_sync(&conn->tmf_timer);
1475
6724add1 1476 mutex_lock(&session->eh_mutex);
77a23c21 1477 spin_lock_bh(&session->lock);
9c19a7d0 1478 /* if the session drops it will clean up the task */
843c0a8a
MC		 1479 if (age != session->age ||
1480 session->state != ISCSI_STATE_LOGGED_IN)
1481 return -ENOTCONN;
7996a778
MC		 1482 return 0;
1483}
1484
843c0a8a
MC		 1485/*
1486 * Fail commands. session lock held and recv side suspended and xmit
1487 * thread flushed
1488 */
6eabafbe
MC		 1489static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1490 int error)
843c0a8a 1491{
9c19a7d0 1492 struct iscsi_task *task, *tmp;
843c0a8a 1493
9c19a7d0
MC		 1494 if (conn->task && (conn->task->sc->device->lun == lun || lun == -1))
1495 conn->task = NULL;
843c0a8a
MC		 1496
1497 /* flush pending */
9c19a7d0
MC		 1498 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1499 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1500 debug_scsi("failing pending sc %p itt 0x%x\n",
9c19a7d0
MC		 1501 task->sc, task->itt);
1502 fail_command(conn, task, error << 16);
843c0a8a
MC		 1503 }
1504 }
1505
9c19a7d0
MC		 1506 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1507 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1508 debug_scsi("failing requeued sc %p itt 0x%x\n",
9c19a7d0
MC		 1509 task->sc, task->itt);
1510 fail_command(conn, task, error << 16);
843c0a8a
MC		 1511 }
1512 }
1513
1514 /* fail all other running */
9c19a7d0
MC		 1515 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1516 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1517 debug_scsi("failing in progress sc %p itt 0x%x\n",
9c19a7d0 1518 task->sc, task->itt);
ac26d41d 1519 fail_command(conn, task, error << 16);
843c0a8a
MC		 1520 }
1521 }
1522}
1523
b40977d9 1524void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1
MC		 1525{
1526 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
052d0144
MC		 1527 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1528 scsi_flush_work(conn->session->host);
6724add1 1529}
b40977d9 1530EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1531
1532static void iscsi_start_tx(struct iscsi_conn *conn)
1533{
1534 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
052d0144
MC		 1535 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1536 scsi_queue_work(conn->session->host, &conn->xmitwork);
6724add1
MC		 1537}
1538
242f9dcb 1539static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
f6d5180c
MC		 1540{
1541 struct iscsi_cls_session *cls_session;
1542 struct iscsi_session *session;
1543 struct iscsi_conn *conn;
242f9dcb 1544 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
f6d5180c
MC		 1545
1546 cls_session = starget_to_session(scsi_target(scmd->device));
75613521 1547 session = cls_session->dd_data;
f6d5180c
MC		 1548
1549 debug_scsi("scsi cmd %p timedout\n", scmd);
1550
1551 spin_lock(&session->lock);
1552 if (session->state != ISCSI_STATE_LOGGED_IN) {
1553 /*
1554 * We are probably in the middle of iscsi recovery so let
1555 * that complete and handle the error.
1556 */
242f9dcb 1557 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1558 goto done;
1559 }
1560
1561 conn = session->leadconn;
1562 if (!conn) {
1563 /* In the middle of shuting down */
242f9dcb 1564 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1565 goto done;
1566 }
1567
1568 if (!conn->recv_timeout && !conn->ping_timeout)
1569 goto done;
1570 /*
1571 * if the ping timedout then we are in the middle of cleaning up
1572 * and can let the iscsi eh handle it
1573 */
1574 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1575 (conn->ping_timeout * HZ), jiffies))
242f9dcb 1576 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1577 /*
1578 * if we are about to check the transport then give the command
1579 * more time
1580 */
1581 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1582 jiffies))
242f9dcb 1583 rc = BLK_EH_RESET_TIMER;
f6d5180c 1584 /* if in the middle of checking the transport then give us more time */
9c19a7d0 1585 if (conn->ping_task)
242f9dcb 1586 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1587done:
1588 spin_unlock(&session->lock);
242f9dcb
JA		 1589 debug_scsi("return %s\n", rc == BLK_EH_RESET_TIMER ?
1590 "timer reset" : "nh");
f6d5180c
MC		 1591 return rc;
1592}
1593
1594static void iscsi_check_transport_timeouts(unsigned long data)
1595{
1596 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1597 struct iscsi_session *session = conn->session;
4cf10435 1598 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c
MC		 1599
1600 spin_lock(&session->lock);
1601 if (session->state != ISCSI_STATE_LOGGED_IN)
1602 goto done;
1603
4cf10435
MC		 1604 recv_timeout = conn->recv_timeout;
1605 if (!recv_timeout)
f6d5180c
MC		 1606 goto done;
1607
4cf10435 1608 recv_timeout *= HZ;
f6d5180c 1609 last_recv = conn->last_recv;
9c19a7d0 1610 if (conn->ping_task &&
4cf10435 1611 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
f6d5180c 1612 jiffies)) {
322d739d
MC		 1613 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1614 "expired, last rx %lu, last ping %lu, "
1615 "now %lu\n", conn->ping_timeout, last_recv,
1616 conn->last_ping, jiffies);
f6d5180c
MC		 1617 spin_unlock(&session->lock);
1618 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1619 return;
1620 }
1621
4cf10435 1622 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97
MC		 1623 /* send a ping to try to provoke some traffic */
1624 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1625 iscsi_send_nopout(conn, NULL);
4cf10435 1626 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 1627 } else
4cf10435 1628 next_timeout = last_recv + recv_timeout;
f6d5180c 1629
ad294e9c
MC		 1630 debug_scsi("Setting next tmo %lu\n", next_timeout);
1631 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 1632done:
1633 spin_unlock(&session->lock);
1634}
1635
9c19a7d0 1636static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 1637 struct iscsi_tm *hdr)
1638{
1639 memset(hdr, 0, sizeof(*hdr));
1640 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1641 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1642 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
9c19a7d0
MC		 1643 memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
1644 hdr->rtt = task->hdr->itt;
1645 hdr->refcmdsn = task->hdr->cmdsn;
843c0a8a
MC		 1646}
1647
7996a778
MC		 1648int iscsi_eh_abort(struct scsi_cmnd *sc)
1649{
75613521
MC		 1650 struct iscsi_cls_session *cls_session;
1651 struct iscsi_session *session;
f47f2cf5 1652 struct iscsi_conn *conn;
9c19a7d0 1653 struct iscsi_task *task;
843c0a8a
MC		 1654 struct iscsi_tm *hdr;
1655 int rc, age;
7996a778 1656
75613521
MC		 1657 cls_session = starget_to_session(scsi_target(sc->device));
1658 session = cls_session->dd_data;
1659
6724add1
MC		 1660 mutex_lock(&session->eh_mutex);
1661 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1662 /*
1663 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1664 * got the command.
1665 */
1666 if (!sc->SCp.ptr) {
1667 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1668 spin_unlock_bh(&session->lock);
1669 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1670 return SUCCESS;
1671 }
1672
7996a778
MC		 1673 /*
1674 * If we are not logged in or we have started a new session
1675 * then let the host reset code handle this
1676 */
843c0a8a
MC		 1677 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1678 sc->SCp.phase != session->age) {
1679 spin_unlock_bh(&session->lock);
1680 mutex_unlock(&session->eh_mutex);
1681 return FAILED;
1682 }
1683
1684 conn = session->leadconn;
1685 conn->eh_abort_cnt++;
1686 age = session->age;
1687
9c19a7d0
MC		 1688 task = (struct iscsi_task *)sc->SCp.ptr;
1689 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, task->itt);
7996a778 1690
9c19a7d0
MC		 1691 /* task completed before time out */
1692 if (!task->sc) {
7ea8b828 1693 debug_scsi("sc completed while abort in progress\n");
77a23c21 1694 goto success;
7ea8b828 1695 }
7996a778 1696
9c19a7d0
MC		 1697 if (task->state == ISCSI_TASK_PENDING) {
1698 fail_command(conn, task, DID_ABORT << 16);
77a23c21
MC		 1699 goto success;
1700 }
7996a778 1701
843c0a8a
MC		 1702 /* only have one tmf outstanding at a time */
1703 if (conn->tmf_state != TMF_INITIAL)
7996a778 1704 goto failed;
843c0a8a 1705 conn->tmf_state = TMF_QUEUED;
7996a778 1706
843c0a8a 1707 hdr = &conn->tmhdr;
9c19a7d0 1708 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 1709
9c19a7d0 1710 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1711 rc = FAILED;
1712 goto failed;
1713 }
1714
1715 switch (conn->tmf_state) {
1716 case TMF_SUCCESS:
77a23c21 1717 spin_unlock_bh(&session->lock);
913e5bf4
MC		 1718 /*
1719 * stop tx side incase the target had sent a abort rsp but
1720 * the initiator was still writing out data.
1721 */
6724add1 1722 iscsi_suspend_tx(conn);
77a23c21 1723 /*
913e5bf4
MC		 1724 * we do not stop the recv side because targets have been
1725 * good and have never sent us a successful tmf response
1726 * then sent more data for the cmd.
77a23c21 1727 */
77a23c21 1728 spin_lock(&session->lock);
9c19a7d0 1729 fail_command(conn, task, DID_ABORT << 16);
843c0a8a 1730 conn->tmf_state = TMF_INITIAL;
77a23c21 1731 spin_unlock(&session->lock);
6724add1 1732 iscsi_start_tx(conn);
77a23c21 1733 goto success_unlocked;
843c0a8a
MC		 1734 case TMF_TIMEDOUT:
1735 spin_unlock_bh(&session->lock);
1736 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1737 goto failed_unlocked;
1738 case TMF_NOT_FOUND:
1739 if (!sc->SCp.ptr) {
1740 conn->tmf_state = TMF_INITIAL;
9c19a7d0 1741 /* task completed before tmf abort response */
7ea8b828 1742 debug_scsi("sc completed while abort in progress\n");
77a23c21 1743 goto success;
7ea8b828
MC		 1744 }
1745 /* fall through */
1746 default:
843c0a8a
MC		 1747 conn->tmf_state = TMF_INITIAL;
1748 goto failed;
7996a778
MC		 1749 }
1750
77a23c21 1751success:
7996a778 1752 spin_unlock_bh(&session->lock);
77a23c21 1753success_unlocked:
9c19a7d0 1754 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, task->itt);
6724add1 1755 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1756 return SUCCESS;
1757
1758failed:
1759 spin_unlock_bh(&session->lock);
77a23c21 1760failed_unlocked:
843c0a8a 1761 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
9c19a7d0 1762 task ? task->itt : 0);
6724add1 1763 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1764 return FAILED;
1765}
1766EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1767
843c0a8a
MC		 1768static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1769{
1770 memset(hdr, 0, sizeof(*hdr));
1771 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1772 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1773 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1774 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1775 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1776}
1777
1778int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1779{
75613521
MC		 1780 struct iscsi_cls_session *cls_session;
1781 struct iscsi_session *session;
843c0a8a
MC		 1782 struct iscsi_conn *conn;
1783 struct iscsi_tm *hdr;
1784 int rc = FAILED;
1785
75613521
MC		 1786 cls_session = starget_to_session(scsi_target(sc->device));
1787 session = cls_session->dd_data;
1788
843c0a8a
MC		 1789 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1790
1791 mutex_lock(&session->eh_mutex);
1792 spin_lock_bh(&session->lock);
1793 /*
1794 * Just check if we are not logged in. We cannot check for
1795 * the phase because the reset could come from a ioctl.
1796 */
1797 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1798 goto unlock;
1799 conn = session->leadconn;
1800
1801 /* only have one tmf outstanding at a time */
1802 if (conn->tmf_state != TMF_INITIAL)
1803 goto unlock;
1804 conn->tmf_state = TMF_QUEUED;
1805
1806 hdr = &conn->tmhdr;
1807 iscsi_prep_lun_reset_pdu(sc, hdr);
1808
9c19a7d0 1809 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 1810 session->lu_reset_timeout)) {
843c0a8a
MC		 1811 rc = FAILED;
1812 goto unlock;
1813 }
1814
1815 switch (conn->tmf_state) {
1816 case TMF_SUCCESS:
1817 break;
1818 case TMF_TIMEDOUT:
1819 spin_unlock_bh(&session->lock);
1820 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1821 goto done;
1822 default:
1823 conn->tmf_state = TMF_INITIAL;
1824 goto unlock;
1825 }
1826
1827 rc = SUCCESS;
1828 spin_unlock_bh(&session->lock);
1829
1830 iscsi_suspend_tx(conn);
913e5bf4 1831
843c0a8a 1832 spin_lock(&session->lock);
6eabafbe 1833 fail_all_commands(conn, sc->device->lun, DID_ERROR);
843c0a8a
MC		 1834 conn->tmf_state = TMF_INITIAL;
1835 spin_unlock(&session->lock);
843c0a8a
MC		 1836
1837 iscsi_start_tx(conn);
1838 goto done;
1839
1840unlock:
1841 spin_unlock_bh(&session->lock);
1842done:
1843 debug_scsi("iscsi_eh_device_reset %s\n",
1844 rc == SUCCESS ? "SUCCESS" : "FAILED");
1845 mutex_unlock(&session->eh_mutex);
1846 return rc;
1847}
1848EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1849
6320377f
OK		 1850/*
1851 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1852 * should be accessed via kfifo_{get,put} on q->queue.
1853 * Optionally, the caller can obtain the array of object pointers
1854 * by passing in a non-NULL @items pointer
1855 */
7996a778 1856int
6320377f 1857iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1858{
6320377f 1859 int i, num_arrays = 1;
7996a778 1860
6320377f 1861 memset(q, 0, sizeof(*q));
7996a778
MC		 1862
1863 q->max = max;
6320377f
OK		 1864
1865 /* If the user passed an items pointer, he wants a copy of
1866 * the array. */
1867 if (items)
1868 num_arrays++;
1869 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1870 if (q->pool == NULL)
1871 goto enomem;
7996a778
MC		 1872
1873 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1874 GFP_KERNEL, NULL);
6320377f
OK		 1875 if (q->queue == ERR_PTR(-ENOMEM))
1876 goto enomem;
7996a778
MC		 1877
1878 for (i = 0; i < max; i++) {
6320377f 1879 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1880 if (q->pool[i] == NULL) {
6320377f
OK		 1881 q->max = i;
1882 goto enomem;
7996a778 1883 }
7996a778
MC		 1884 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1885 }
6320377f
OK		 1886
1887 if (items) {
1888 *items = q->pool + max;
1889 memcpy(*items, q->pool, max * sizeof(void *));
1890 }
1891
7996a778 1892 return 0;
6320377f
OK		 1893
1894enomem:
1895 iscsi_pool_free(q);
1896 return -ENOMEM;
7996a778
MC		 1897}
1898EXPORT_SYMBOL_GPL(iscsi_pool_init);
1899
6320377f 1900void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1901{
1902 int i;
1903
1904 for (i = 0; i < q->max; i++)
6320377f
OK		 1905 kfree(q->pool[i]);
1906 if (q->pool)
1907 kfree(q->pool);
7996a778
MC		 1908}
1909EXPORT_SYMBOL_GPL(iscsi_pool_free);
1910
a4804cd6
MC		 1911/**
1912 * iscsi_host_add - add host to system
1913 * @shost: scsi host
1914 * @pdev: parent device
1915 *
1916 * This should be called by partial offload and software iscsi drivers
1917 * to add a host to the system.
1918 */
1919int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
1920{
8e9a20ce
MC		 1921 if (!shost->can_queue)
1922 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
1923
a4804cd6
MC		 1924 return scsi_add_host(shost, pdev);
1925}
1926EXPORT_SYMBOL_GPL(iscsi_host_add);
1927
1928/**
1929 * iscsi_host_alloc - allocate a host and driver data
1930 * @sht: scsi host template
1931 * @dd_data_size: driver host data size
1932 * @qdepth: default device queue depth
1933 *
1934 * This should be called by partial offload and software iscsi drivers.
1935 * To access the driver specific memory use the iscsi_host_priv() macro.
1936 */
1937struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
1938 int dd_data_size, uint16_t qdepth)
75613521 1939{
a4804cd6 1940 struct Scsi_Host *shost;
e5bd7b54 1941 struct iscsi_host *ihost;
a4804cd6
MC		 1942
1943 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
1944 if (!shost)
1945 return NULL;
1946 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1947
75613521
MC		 1948 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1949 if (qdepth != 0)
1950 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1951 "Queue depth must be between 1 and %d.\n",
1952 qdepth, ISCSI_MAX_CMD_PER_LUN);
1953 qdepth = ISCSI_DEF_CMD_PER_LUN;
1954 }
75613521 1955 shost->cmd_per_lun = qdepth;
e5bd7b54
MC		 1956
1957 ihost = shost_priv(shost);
1958 spin_lock_init(&ihost->lock);
1959 ihost->state = ISCSI_HOST_SETUP;
1960 ihost->num_sessions = 0;
1961 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6
MC		 1962 return shost;
1963}
1964EXPORT_SYMBOL_GPL(iscsi_host_alloc);
1965
e5bd7b54
MC		 1966static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
1967{
1968 iscsi_session_failure(cls_session, ISCSI_ERR_INVALID_HOST);
1969}
1970
a4804cd6
MC		 1971/**
1972 * iscsi_host_remove - remove host and sessions
1973 * @shost: scsi host
1974 *
e5bd7b54
MC		 1975 * If there are any sessions left, this will initiate the removal and wait
1976 * for the completion.
a4804cd6
MC		 1977 */
1978void iscsi_host_remove(struct Scsi_Host *shost)
1979{
e5bd7b54
MC		 1980 struct iscsi_host *ihost = shost_priv(shost);
1981 unsigned long flags;
1982
1983 spin_lock_irqsave(&ihost->lock, flags);
1984 ihost->state = ISCSI_HOST_REMOVED;
1985 spin_unlock_irqrestore(&ihost->lock, flags);
1986
1987 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
1988 wait_event_interruptible(ihost->session_removal_wq,
1989 ihost->num_sessions == 0);
1990 if (signal_pending(current))
1991 flush_signals(current);
1992
a4804cd6 1993 scsi_remove_host(shost);
75613521 1994}
a4804cd6 1995EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 1996
a4804cd6 1997void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 1998{
1999 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2000
75613521
MC		 2001 kfree(ihost->netdev);
2002 kfree(ihost->hwaddress);
2003 kfree(ihost->initiatorname);
a4804cd6 2004 scsi_host_put(shost);
75613521 2005}
a4804cd6 2006EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2007
e5bd7b54
MC		 2008static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2009{
2010 struct iscsi_host *ihost = shost_priv(shost);
2011 unsigned long flags;
2012
2013 shost = scsi_host_get(shost);
2014 if (!shost) {
2015 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2016 "of session teardown event because host already "
2017 "removed.\n");
2018 return;
2019 }
2020
2021 spin_lock_irqsave(&ihost->lock, flags);
2022 ihost->num_sessions--;
2023 if (ihost->num_sessions == 0)
2024 wake_up(&ihost->session_removal_wq);
2025 spin_unlock_irqrestore(&ihost->lock, flags);
2026 scsi_host_put(shost);
2027}
2028
7996a778
MC		 2029/**
2030 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2031 * @iscsit: iscsi transport template
75613521
MC		 2032 * @shost: scsi host
2033 * @cmds_max: session can queue
9c19a7d0 2034 * @cmd_task_size: LLD task private data size
7996a778 2035 * @initial_cmdsn: initial CmdSN
7996a778
MC		 2036 *
2037 * This can be used by software iscsi_transports that allocate
2038 * a session per scsi host.
3cf7b233
MC		 2039 *
2040 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2041 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2042 * for nop handling and login/logout requests.
75613521 2043 */
7996a778 2044struct iscsi_cls_session *
75613521 2045iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
3cf7b233 2046 uint16_t cmds_max, int cmd_task_size,
7970634b 2047 uint32_t initial_cmdsn, unsigned int id)
7996a778 2048{
e5bd7b54 2049 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2050 struct iscsi_session *session;
2051 struct iscsi_cls_session *cls_session;
3cf7b233 2052 int cmd_i, scsi_cmds, total_cmds = cmds_max;
e5bd7b54
MC		 2053 unsigned long flags;
2054
2055 spin_lock_irqsave(&ihost->lock, flags);
2056 if (ihost->state == ISCSI_HOST_REMOVED) {
2057 spin_unlock_irqrestore(&ihost->lock, flags);
2058 return NULL;
2059 }
2060 ihost->num_sessions++;
2061 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce
MC		 2062
2063 if (!total_cmds)
2064 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 2065 /*
3cf7b233
MC		 2066 * The iscsi layer needs some tasks for nop handling and tmfs,
2067 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2068 * + 1 command for scsi IO.
3e5c28ad 2069 */
3cf7b233
MC		 2070 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2071 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2072 "must be a power of two that is at least %d.\n",
2073 total_cmds, ISCSI_TOTAL_CMDS_MIN);
e5bd7b54 2074 goto dec_session_count;
3cf7b233
MC		 2075 }
2076
2077 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2078 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2079 "must be a power of 2 less than or equal to %d.\n",
2080 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2081 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2082 }
2083
2084 if (!is_power_of_2(total_cmds)) {
2085 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2086 "must be a power of 2.\n", total_cmds);
2087 total_cmds = rounddown_pow_of_two(total_cmds);
2088 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2089 return NULL;
2090 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2091 total_cmds);
1548271e 2092 }
3cf7b233 2093 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2094
5d91e209
MC		 2095 cls_session = iscsi_alloc_session(shost, iscsit,
2096 sizeof(struct iscsi_session));
75613521 2097 if (!cls_session)
e5bd7b54 2098 goto dec_session_count;
75613521
MC		 2099 session = cls_session->dd_data;
2100 session->cls_session = cls_session;
7996a778
MC		 2101 session->host = shost;
2102 session->state = ISCSI_STATE_FREE;
f6d5180c 2103 session->fast_abort = 1;
4cd49ea1
MC		 2104 session->lu_reset_timeout = 15;
2105 session->abort_timeout = 10;
3cf7b233
MC		 2106 session->scsi_cmds_max = scsi_cmds;
2107 session->cmds_max = total_cmds;
e0726407 2108 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2109 session->exp_cmdsn = initial_cmdsn + 1;
2110 session->max_cmdsn = initial_cmdsn + 1;
2111 session->max_r2t = 1;
2112 session->tt = iscsit;
6724add1 2113 mutex_init(&session->eh_mutex);
75613521 2114 spin_lock_init(&session->lock);
7996a778
MC		 2115
2116 /* initialize SCSI PDU commands pool */
2117 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2118 (void***)&session->cmds,
9c19a7d0 2119 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2120 goto cmdpool_alloc_fail;
2121
2122 /* pre-format cmds pool with ITT */
2123 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2124 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2125
9c19a7d0
MC		 2126 if (cmd_task_size)
2127 task->dd_data = &task[1];
2128 task->itt = cmd_i;
2129 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2130 }
2131
f53a88da 2132 if (!try_module_get(iscsit->owner))
75613521 2133 goto module_get_fail;
7996a778 2134
7970634b 2135 if (iscsi_add_session(cls_session, id))
75613521 2136 goto cls_session_fail;
e5bd7b54 2137
7996a778
MC		 2138 return cls_session;
2139
2140cls_session_fail:
75613521
MC		 2141 module_put(iscsit->owner);
2142module_get_fail:
6320377f 2143 iscsi_pool_free(&session->cmdpool);
7996a778 2144cmdpool_alloc_fail:
75613521 2145 iscsi_free_session(cls_session);
e5bd7b54
MC		 2146dec_session_count:
2147 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2148 return NULL;
2149}
2150EXPORT_SYMBOL_GPL(iscsi_session_setup);
2151
2152/**
2153 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2154 * @cls_session: iscsi session
7996a778 2155 *
75613521
MC		 2156 * The driver must have called iscsi_remove_session before
2157 * calling this.
2158 */
7996a778
MC		 2159void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2160{
75613521 2161 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2162 struct module *owner = cls_session->transport->owner;
e5bd7b54 2163 struct Scsi_Host *shost = session->host;
7996a778 2164
6320377f 2165 iscsi_pool_free(&session->cmdpool);
7996a778 2166
b2c64167
MC		 2167 kfree(session->password);
2168 kfree(session->password_in);
2169 kfree(session->username);
2170 kfree(session->username_in);
f3ff0c36 2171 kfree(session->targetname);
88dfd340
MC		 2172 kfree(session->initiatorname);
2173 kfree(session->ifacename);
f3ff0c36 2174
75613521 2175 iscsi_destroy_session(cls_session);
e5bd7b54 2176 iscsi_host_dec_session_cnt(shost);
63f75cc8 2177 module_put(owner);
7996a778
MC		 2178}
2179EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2180
2181/**
2182 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2183 * @cls_session: iscsi_cls_session
5d91e209 2184 * @dd_size: private driver data size
7996a778 2185 * @conn_idx: cid
5d91e209 2186 */
7996a778 2187struct iscsi_cls_conn *
5d91e209
MC		 2188iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2189 uint32_t conn_idx)
7996a778 2190{
75613521 2191 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2192 struct iscsi_conn *conn;
2193 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2194 char *data;
7996a778 2195
5d91e209
MC		 2196 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2197 conn_idx);
7996a778
MC		 2198 if (!cls_conn)
2199 return NULL;
2200 conn = cls_conn->dd_data;
5d91e209 2201 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2202
5d91e209 2203 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2204 conn->session = session;
2205 conn->cls_conn = cls_conn;
2206 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2207 conn->id = conn_idx;
2208 conn->exp_statsn = 0;
843c0a8a 2209 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 2210
2211 init_timer(&conn->transport_timer);
2212 conn->transport_timer.data = (unsigned long)conn;
2213 conn->transport_timer.function = iscsi_check_transport_timeouts;
2214
7996a778
MC		 2215 INIT_LIST_HEAD(&conn->run_list);
2216 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 2217 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 2218 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 2219 INIT_LIST_HEAD(&conn->requeue);
c4028958 2220 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2221
9c19a7d0 2222 /* allocate login_task used for the login/text sequences */
7996a778 2223 spin_lock_bh(&session->lock);
3e5c28ad 2224 if (!__kfifo_get(session->cmdpool.queue,
9c19a7d0 2225 (void*)&conn->login_task,
7996a778
MC		 2226 sizeof(void*))) {
2227 spin_unlock_bh(&session->lock);
9c19a7d0 2228 goto login_task_alloc_fail;
7996a778
MC		 2229 }
2230 spin_unlock_bh(&session->lock);
2231
bf32ed33 2232 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3 2233 if (!data)
9c19a7d0
MC		 2234 goto login_task_data_alloc_fail;
2235 conn->login_task->data = conn->data = data;
d36ab6f3 2236
843c0a8a 2237 init_timer(&conn->tmf_timer);
7996a778
MC		 2238 init_waitqueue_head(&conn->ehwait);
2239
2240 return cls_conn;
2241
9c19a7d0
MC		 2242login_task_data_alloc_fail:
2243 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2244 sizeof(void*));
9c19a7d0 2245login_task_alloc_fail:
7996a778
MC		 2246 iscsi_destroy_conn(cls_conn);
2247 return NULL;
2248}
2249EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2250
2251/**
2252 * iscsi_conn_teardown - teardown iscsi connection
2253 * cls_conn: iscsi class connection
2254 *
2255 * TODO: we may need to make this into a two step process
2256 * like scsi-mls remove + put host
2257 */
2258void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2259{
2260 struct iscsi_conn *conn = cls_conn->dd_data;
2261 struct iscsi_session *session = conn->session;
2262 unsigned long flags;
2263
f6d5180c
MC		 2264 del_timer_sync(&conn->transport_timer);
2265
7996a778
MC		 2266 spin_lock_bh(&session->lock);
2267 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2268 if (session->leadconn == conn) {
2269 /*
2270 * leading connection? then give up on recovery.
2271 */
2272 session->state = ISCSI_STATE_TERMINATE;
2273 wake_up(&conn->ehwait);
2274 }
2275 spin_unlock_bh(&session->lock);
2276
7996a778
MC		 2277 /*
2278 * Block until all in-progress commands for this connection
2279 * time out or fail.
2280 */
2281 for (;;) {
2282 spin_lock_irqsave(session->host->host_lock, flags);
2283 if (!session->host->host_busy) { /* OK for ERL == 0 */
2284 spin_unlock_irqrestore(session->host->host_lock, flags);
2285 break;
2286 }
2287 spin_unlock_irqrestore(session->host->host_lock, flags);
2288 msleep_interruptible(500);
322d739d
MC		 2289 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2290 "host_busy %d host_failed %d\n",
2291 session->host->host_busy,
2292 session->host->host_failed);
7996a778
MC		 2293 /*
2294 * force eh_abort() to unblock
2295 */
2296 wake_up(&conn->ehwait);
2297 }
2298
779ea120 2299 /* flush queued up work because we free the connection below */
843c0a8a 2300 iscsi_suspend_tx(conn);
779ea120 2301
7996a778 2302 spin_lock_bh(&session->lock);
c8dc1e52 2303 kfree(conn->data);
f3ff0c36 2304 kfree(conn->persistent_address);
9c19a7d0 2305 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
7996a778 2306 sizeof(void*));
e0726407 2307 if (session->leadconn == conn)
7996a778 2308 session->leadconn = NULL;
7996a778
MC		 2309 spin_unlock_bh(&session->lock);
2310
7996a778
MC		 2311 iscsi_destroy_conn(cls_conn);
2312}
2313EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2314
2315int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2316{
2317 struct iscsi_conn *conn = cls_conn->dd_data;
2318 struct iscsi_session *session = conn->session;
2319
ffd0436e 2320 if (!session) {
322d739d
MC		 2321 iscsi_conn_printk(KERN_ERR, conn,
2322 "can't start unbound connection\n");
7996a778
MC		 2323 return -EPERM;
2324 }
2325
db98ccde
MC		 2326 if ((session->imm_data_en || !session->initial_r2t_en) &&
2327 session->first_burst > session->max_burst) {
322d739d
MC		 2328 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2329 "first_burst %d max_burst %d\n",
2330 session->first_burst, session->max_burst);
ffd0436e
MC		 2331 return -EINVAL;
2332 }
2333
f6d5180c 2334 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2335 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2336 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2337 conn->recv_timeout = 5;
2338 }
2339
2340 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2341 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2342 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2343 conn->ping_timeout = 5;
2344 }
2345
7996a778
MC		 2346 spin_lock_bh(&session->lock);
2347 conn->c_stage = ISCSI_CONN_STARTED;
2348 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2349 session->queued_cmdsn = session->cmdsn;
7996a778 2350
f6d5180c
MC		 2351 conn->last_recv = jiffies;
2352 conn->last_ping = jiffies;
2353 if (conn->recv_timeout && conn->ping_timeout)
2354 mod_timer(&conn->transport_timer,
2355 jiffies + (conn->recv_timeout * HZ));
2356
7996a778
MC		 2357 switch(conn->stop_stage) {
2358 case STOP_CONN_RECOVER:
2359 /*
2360 * unblock eh_abort() if it is blocked. re-try all
2361 * commands after successful recovery
2362 */
7996a778 2363 conn->stop_stage = 0;
843c0a8a 2364 conn->tmf_state = TMF_INITIAL;
7996a778 2365 session->age++;
8b1d0343
MC		 2366 if (session->age == 16)
2367 session->age = 0;
6eabafbe 2368 break;
7996a778 2369 case STOP_CONN_TERM:
7996a778 2370 conn->stop_stage = 0;
7996a778
MC		 2371 break;
2372 default:
2373 break;
2374 }
2375 spin_unlock_bh(&session->lock);
2376
75613521 2377 iscsi_unblock_session(session->cls_session);
6eabafbe 2378 wake_up(&conn->ehwait);
7996a778
MC		 2379 return 0;
2380}
2381EXPORT_SYMBOL_GPL(iscsi_conn_start);
2382
2383static void
2384flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2385{
9c19a7d0 2386 struct iscsi_task *task, *tmp;
7996a778
MC		 2387
2388 /* handle pending */
9c19a7d0
MC		 2389 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2390 debug_scsi("flushing pending mgmt task itt 0x%x\n", task->itt);
2391 /* release ref from prep task */
2392 __iscsi_put_task(task);
7996a778
MC		 2393 }
2394
2395 /* handle running */
9c19a7d0
MC		 2396 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2397 debug_scsi("flushing running mgmt task itt 0x%x\n", task->itt);
2398 /* release ref from prep task */
2399 __iscsi_put_task(task);
7996a778
MC		 2400 }
2401
9c19a7d0 2402 conn->task = NULL;
7996a778
MC		 2403}
2404
656cffc9
MC		 2405static void iscsi_start_session_recovery(struct iscsi_session *session,
2406 struct iscsi_conn *conn, int flag)
7996a778 2407{
ed2abc7f
MC		 2408 int old_stop_stage;
2409
f6d5180c
MC		 2410 del_timer_sync(&conn->transport_timer);
2411
6724add1 2412 mutex_lock(&session->eh_mutex);
7996a778 2413 spin_lock_bh(&session->lock);
ed2abc7f 2414 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2415 spin_unlock_bh(&session->lock);
6724add1
MC		 2416 mutex_unlock(&session->eh_mutex);
2417 return;
2418 }
2419
ed2abc7f
MC		 2420 /*
2421 * When this is called for the in_login state, we only want to clean
9c19a7d0 2422 * up the login task and connection. We do not need to block and set
67a61114 2423 * the recovery state again
ed2abc7f 2424 */
67a61114
MC		 2425 if (flag == STOP_CONN_TERM)
2426 session->state = ISCSI_STATE_TERMINATE;
2427 else if (conn->stop_stage != STOP_CONN_RECOVER)
2428 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 2429
2430 old_stop_stage = conn->stop_stage;
7996a778 2431 conn->stop_stage = flag;
67a61114 2432 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2433 spin_unlock_bh(&session->lock);
6724add1
MC		 2434
2435 iscsi_suspend_tx(conn);
7996a778
MC		 2436 /*
2437 * for connection level recovery we should not calculate
2438 * header digest. conn->hdr_size used for optimization
2439 * in hdr_extract() and will be re-negotiated at
2440 * set_param() time.
2441 */
2442 if (flag == STOP_CONN_RECOVER) {
2443 conn->hdrdgst_en = 0;
2444 conn->datadgst_en = 0;
656cffc9 2445 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 2446 old_stop_stage != STOP_CONN_RECOVER) {
2447 debug_scsi("blocking session\n");
75613521 2448 iscsi_block_session(session->cls_session);
67a61114 2449 }
7996a778 2450 }
656cffc9 2451
656cffc9
MC		 2452 /*
2453 * flush queues.
2454 */
2455 spin_lock_bh(&session->lock);
56d7fcfa
MC		 2456 if (STOP_CONN_RECOVER)
2457 fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
2458 else
2459 fail_all_commands(conn, -1, DID_ERROR);
656cffc9
MC		 2460 flush_control_queues(session, conn);
2461 spin_unlock_bh(&session->lock);
6724add1 2462 mutex_unlock(&session->eh_mutex);
7996a778 2463}
7996a778
MC		 2464
2465void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2466{
2467 struct iscsi_conn *conn = cls_conn->dd_data;
2468 struct iscsi_session *session = conn->session;
2469
2470 switch (flag) {
2471 case STOP_CONN_RECOVER:
2472 case STOP_CONN_TERM:
2473 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2474 break;
7996a778 2475 default:
322d739d
MC		 2476 iscsi_conn_printk(KERN_ERR, conn,
2477 "invalid stop flag %d\n", flag);
7996a778
MC		 2478 }
2479}
2480EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2481
2482int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2483 struct iscsi_cls_conn *cls_conn, int is_leading)
2484{
75613521 2485 struct iscsi_session *session = cls_session->dd_data;
98644047 2486 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2487
7996a778 2488 spin_lock_bh(&session->lock);
7996a778
MC		 2489 if (is_leading)
2490 session->leadconn = conn;
98644047 2491 spin_unlock_bh(&session->lock);
7996a778
MC		 2492
2493 /*
2494 * Unblock xmitworker(), Login Phase will pass through.
2495 */
2496 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2497 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2498 return 0;
2499}
2500EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2501
a54a52ca
MC		 2502
2503int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2504 enum iscsi_param param, char *buf, int buflen)
2505{
2506 struct iscsi_conn *conn = cls_conn->dd_data;
2507 struct iscsi_session *session = conn->session;
2508 uint32_t value;
2509
2510 switch(param) {
843c0a8a
MC		 2511 case ISCSI_PARAM_FAST_ABORT:
2512 sscanf(buf, "%d", &session->fast_abort);
2513 break;
f6d5180c
MC		 2514 case ISCSI_PARAM_ABORT_TMO:
2515 sscanf(buf, "%d", &session->abort_timeout);
2516 break;
2517 case ISCSI_PARAM_LU_RESET_TMO:
2518 sscanf(buf, "%d", &session->lu_reset_timeout);
2519 break;
2520 case ISCSI_PARAM_PING_TMO:
2521 sscanf(buf, "%d", &conn->ping_timeout);
2522 break;
2523 case ISCSI_PARAM_RECV_TMO:
2524 sscanf(buf, "%d", &conn->recv_timeout);
2525 break;
a54a52ca
MC		 2526 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2527 sscanf(buf, "%d", &conn->max_recv_dlength);
2528 break;
2529 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2530 sscanf(buf, "%d", &conn->max_xmit_dlength);
2531 break;
2532 case ISCSI_PARAM_HDRDGST_EN:
2533 sscanf(buf, "%d", &conn->hdrdgst_en);
2534 break;
2535 case ISCSI_PARAM_DATADGST_EN:
2536 sscanf(buf, "%d", &conn->datadgst_en);
2537 break;
2538 case ISCSI_PARAM_INITIAL_R2T_EN:
2539 sscanf(buf, "%d", &session->initial_r2t_en);
2540 break;
2541 case ISCSI_PARAM_MAX_R2T:
2542 sscanf(buf, "%d", &session->max_r2t);
2543 break;
2544 case ISCSI_PARAM_IMM_DATA_EN:
2545 sscanf(buf, "%d", &session->imm_data_en);
2546 break;
2547 case ISCSI_PARAM_FIRST_BURST:
2548 sscanf(buf, "%d", &session->first_burst);
2549 break;
2550 case ISCSI_PARAM_MAX_BURST:
2551 sscanf(buf, "%d", &session->max_burst);
2552 break;
2553 case ISCSI_PARAM_PDU_INORDER_EN:
2554 sscanf(buf, "%d", &session->pdu_inorder_en);
2555 break;
2556 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2557 sscanf(buf, "%d", &session->dataseq_inorder_en);
2558 break;
2559 case ISCSI_PARAM_ERL:
2560 sscanf(buf, "%d", &session->erl);
2561 break;
2562 case ISCSI_PARAM_IFMARKER_EN:
2563 sscanf(buf, "%d", &value);
2564 BUG_ON(value);
2565 break;
2566 case ISCSI_PARAM_OFMARKER_EN:
2567 sscanf(buf, "%d", &value);
2568 BUG_ON(value);
2569 break;
2570 case ISCSI_PARAM_EXP_STATSN:
2571 sscanf(buf, "%u", &conn->exp_statsn);
2572 break;
b2c64167
MC		 2573 case ISCSI_PARAM_USERNAME:
2574 kfree(session->username);
2575 session->username = kstrdup(buf, GFP_KERNEL);
2576 if (!session->username)
2577 return -ENOMEM;
2578 break;
2579 case ISCSI_PARAM_USERNAME_IN:
2580 kfree(session->username_in);
2581 session->username_in = kstrdup(buf, GFP_KERNEL);
2582 if (!session->username_in)
2583 return -ENOMEM;
2584 break;
2585 case ISCSI_PARAM_PASSWORD:
2586 kfree(session->password);
2587 session->password = kstrdup(buf, GFP_KERNEL);
2588 if (!session->password)
2589 return -ENOMEM;
2590 break;
2591 case ISCSI_PARAM_PASSWORD_IN:
2592 kfree(session->password_in);
2593 session->password_in = kstrdup(buf, GFP_KERNEL);
2594 if (!session->password_in)
2595 return -ENOMEM;
2596 break;
a54a52ca
MC		 2597 case ISCSI_PARAM_TARGET_NAME:
2598 /* this should not change between logins */
2599 if (session->targetname)
2600 break;
2601
2602 session->targetname = kstrdup(buf, GFP_KERNEL);
2603 if (!session->targetname)
2604 return -ENOMEM;
2605 break;
2606 case ISCSI_PARAM_TPGT:
2607 sscanf(buf, "%d", &session->tpgt);
2608 break;
2609 case ISCSI_PARAM_PERSISTENT_PORT:
2610 sscanf(buf, "%d", &conn->persistent_port);
2611 break;
2612 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2613 /*
2614 * this is the address returned in discovery so it should
2615 * not change between logins.
2616 */
2617 if (conn->persistent_address)
2618 break;
2619
2620 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2621 if (!conn->persistent_address)
2622 return -ENOMEM;
2623 break;
88dfd340
MC		 2624 case ISCSI_PARAM_IFACE_NAME:
2625 if (!session->ifacename)
2626 session->ifacename = kstrdup(buf, GFP_KERNEL);
2627 break;
2628 case ISCSI_PARAM_INITIATOR_NAME:
2629 if (!session->initiatorname)
2630 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2631 break;
a54a52ca
MC		 2632 default:
2633 return -ENOSYS;
2634 }
2635
2636 return 0;
2637}
2638EXPORT_SYMBOL_GPL(iscsi_set_param);
2639
2640int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2641 enum iscsi_param param, char *buf)
2642{
75613521 2643 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 2644 int len;
2645
2646 switch(param) {
843c0a8a
MC		 2647 case ISCSI_PARAM_FAST_ABORT:
2648 len = sprintf(buf, "%d\n", session->fast_abort);
2649 break;
f6d5180c
MC		 2650 case ISCSI_PARAM_ABORT_TMO:
2651 len = sprintf(buf, "%d\n", session->abort_timeout);
2652 break;
2653 case ISCSI_PARAM_LU_RESET_TMO:
2654 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2655 break;
a54a52ca
MC		 2656 case ISCSI_PARAM_INITIAL_R2T_EN:
2657 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2658 break;
2659 case ISCSI_PARAM_MAX_R2T:
2660 len = sprintf(buf, "%hu\n", session->max_r2t);
2661 break;
2662 case ISCSI_PARAM_IMM_DATA_EN:
2663 len = sprintf(buf, "%d\n", session->imm_data_en);
2664 break;
2665 case ISCSI_PARAM_FIRST_BURST:
2666 len = sprintf(buf, "%u\n", session->first_burst);
2667 break;
2668 case ISCSI_PARAM_MAX_BURST:
2669 len = sprintf(buf, "%u\n", session->max_burst);
2670 break;
2671 case ISCSI_PARAM_PDU_INORDER_EN:
2672 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2673 break;
2674 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2675 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2676 break;
2677 case ISCSI_PARAM_ERL:
2678 len = sprintf(buf, "%d\n", session->erl);
2679 break;
2680 case ISCSI_PARAM_TARGET_NAME:
2681 len = sprintf(buf, "%s\n", session->targetname);
2682 break;
2683 case ISCSI_PARAM_TPGT:
2684 len = sprintf(buf, "%d\n", session->tpgt);
2685 break;
b2c64167
MC		 2686 case ISCSI_PARAM_USERNAME:
2687 len = sprintf(buf, "%s\n", session->username);
2688 break;
2689 case ISCSI_PARAM_USERNAME_IN:
2690 len = sprintf(buf, "%s\n", session->username_in);
2691 break;
2692 case ISCSI_PARAM_PASSWORD:
2693 len = sprintf(buf, "%s\n", session->password);
2694 break;
2695 case ISCSI_PARAM_PASSWORD_IN:
2696 len = sprintf(buf, "%s\n", session->password_in);
2697 break;
88dfd340
MC		 2698 case ISCSI_PARAM_IFACE_NAME:
2699 len = sprintf(buf, "%s\n", session->ifacename);
2700 break;
2701 case ISCSI_PARAM_INITIATOR_NAME:
2702 if (!session->initiatorname)
2703 len = sprintf(buf, "%s\n", "unknown");
2704 else
2705 len = sprintf(buf, "%s\n", session->initiatorname);
2706 break;
a54a52ca
MC		 2707 default:
2708 return -ENOSYS;
2709 }
2710
2711 return len;
2712}
2713EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2714
2715int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2716 enum iscsi_param param, char *buf)
2717{
2718 struct iscsi_conn *conn = cls_conn->dd_data;
2719 int len;
2720
2721 switch(param) {
f6d5180c
MC		 2722 case ISCSI_PARAM_PING_TMO:
2723 len = sprintf(buf, "%u\n", conn->ping_timeout);
2724 break;
2725 case ISCSI_PARAM_RECV_TMO:
2726 len = sprintf(buf, "%u\n", conn->recv_timeout);
2727 break;
a54a52ca
MC		 2728 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2729 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2730 break;
2731 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2732 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2733 break;
2734 case ISCSI_PARAM_HDRDGST_EN:
2735 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2736 break;
2737 case ISCSI_PARAM_DATADGST_EN:
2738 len = sprintf(buf, "%d\n", conn->datadgst_en);
2739 break;
2740 case ISCSI_PARAM_IFMARKER_EN:
2741 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2742 break;
2743 case ISCSI_PARAM_OFMARKER_EN:
2744 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2745 break;
2746 case ISCSI_PARAM_EXP_STATSN:
2747 len = sprintf(buf, "%u\n", conn->exp_statsn);
2748 break;
2749 case ISCSI_PARAM_PERSISTENT_PORT:
2750 len = sprintf(buf, "%d\n", conn->persistent_port);
2751 break;
2752 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2753 len = sprintf(buf, "%s\n", conn->persistent_address);
2754 break;
2755 default:
2756 return -ENOSYS;
2757 }
2758
2759 return len;
2760}
2761EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2762
0801c242
MC		 2763int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2764 char *buf)
2765{
75613521 2766 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 2767 int len;
2768
2769 switch (param) {
d8196ed2 2770 case ISCSI_HOST_PARAM_NETDEV_NAME:
75613521 2771 if (!ihost->netdev)
d8196ed2
MC		 2772 len = sprintf(buf, "%s\n", "default");
2773 else
75613521 2774 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 2775 break;
0801c242 2776 case ISCSI_HOST_PARAM_HWADDRESS:
75613521 2777 if (!ihost->hwaddress)
0801c242
MC		 2778 len = sprintf(buf, "%s\n", "default");
2779 else
75613521 2780 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 2781 break;
8ad5781a 2782 case ISCSI_HOST_PARAM_INITIATOR_NAME:
75613521 2783 if (!ihost->initiatorname)
8ad5781a
MC		 2784 len = sprintf(buf, "%s\n", "unknown");
2785 else
75613521 2786 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 2787 break;
75613521
MC		 2788 case ISCSI_HOST_PARAM_IPADDRESS:
2789 if (!strlen(ihost->local_address))
2790 len = sprintf(buf, "%s\n", "unknown");
2791 else
2792 len = sprintf(buf, "%s\n",
2793 ihost->local_address);
88dfd340 2794 break;
0801c242
MC		 2795 default:
2796 return -ENOSYS;
2797 }
2798
2799 return len;
2800}
2801EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2802
2803int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2804 char *buf, int buflen)
2805{
75613521 2806 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 2807
2808 switch (param) {
d8196ed2 2809 case ISCSI_HOST_PARAM_NETDEV_NAME:
75613521
MC		 2810 if (!ihost->netdev)
2811 ihost->netdev = kstrdup(buf, GFP_KERNEL);
d8196ed2 2812 break;
0801c242 2813 case ISCSI_HOST_PARAM_HWADDRESS:
75613521
MC		 2814 if (!ihost->hwaddress)
2815 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
0801c242 2816 break;
8ad5781a 2817 case ISCSI_HOST_PARAM_INITIATOR_NAME:
75613521
MC		 2818 if (!ihost->initiatorname)
2819 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
8ad5781a 2820 break;
0801c242
MC		 2821 default:
2822 return -ENOSYS;
2823 }
2824
2825 return 0;
2826}
2827EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2828
7996a778
MC		 2829MODULE_AUTHOR("Mike Christie");
2830MODULE_DESCRIPTION("iSCSI library functions");
2831MODULE_LICENSE("GPL");
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