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[SCSI] libiscsi: fix data corruption when target has to resend data-in packets
[deliverable/linux.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
7996a778
MC		 986void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
987{
988 struct iscsi_session *session = conn->session;
989 unsigned long flags;
990
991 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 992 if (session->state == ISCSI_STATE_FAILED) {
993 spin_unlock_irqrestore(&session->lock, flags);
994 return;
995 }
996
67a61114 997 if (conn->stop_stage == 0)
7996a778
MC		 998 session->state = ISCSI_STATE_FAILED;
999 spin_unlock_irqrestore(&session->lock, flags);
1000 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1001 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1002 iscsi_conn_error(conn->cls_conn, err);
1003}
1004EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1005
77a23c21
MC		 1006static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1007{
1008 struct iscsi_session *session = conn->session;
1009
1010 /*
1011 * Check for iSCSI window and take care of CmdSN wrap-around
1012 */
e0726407
MC		 1013 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1014 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
1015 "CmdSN %u/%u\n", session->exp_cmdsn,
1016 session->max_cmdsn, session->cmdsn,
1017 session->queued_cmdsn);
77a23c21
MC		 1018 return -ENOSPC;
1019 }
1020 return 0;
1021}
1022
9c19a7d0 1023static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1024{
9c19a7d0 1025 struct iscsi_task *task = conn->task;
843c0a8a 1026 int rc;
77a23c21 1027
9c19a7d0 1028 __iscsi_get_task(task);
77a23c21 1029 spin_unlock_bh(&conn->session->lock);
9c19a7d0 1030 rc = conn->session->tt->xmit_task(task);
77a23c21 1031 spin_lock_bh(&conn->session->lock);
9c19a7d0 1032 __iscsi_put_task(task);
77a23c21 1033 if (!rc)
9c19a7d0
MC		 1034 /* done with this task */
1035 conn->task = NULL;
77a23c21
MC		 1036 return rc;
1037}
1038
843c0a8a 1039/**
9c19a7d0
MC		 1040 * iscsi_requeue_task - requeue task to run from session workqueue
1041 * @task: task to requeue
843c0a8a 1042 *
9c19a7d0 1043 * LLDs that need to run a task from the session workqueue should call
052d0144
MC		 1044 * this. The session lock must be held. This should only be called
1045 * by software drivers.
843c0a8a 1046 */
9c19a7d0 1047void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1048{
9c19a7d0 1049 struct iscsi_conn *conn = task->conn;
843c0a8a 1050
9c19a7d0 1051 list_move_tail(&task->running, &conn->requeue);
843c0a8a
MC		 1052 scsi_queue_work(conn->session->host, &conn->xmitwork);
1053}
9c19a7d0 1054EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1055
7996a778
MC		 1056/**
1057 * iscsi_data_xmit - xmit any command into the scheduled connection
1058 * @conn: iscsi connection
1059 *
1060 * Notes:
1061 * The function can return -EAGAIN in which case the caller must
1062 * re-schedule it again later or recover. '0' return code means
1063 * successful xmit.
1064 **/
1065static int iscsi_data_xmit(struct iscsi_conn *conn)
1066{
3219e529 1067 int rc = 0;
7996a778 1068
77a23c21 1069 spin_lock_bh(&conn->session->lock);
7996a778
MC		 1070 if (unlikely(conn->suspend_tx)) {
1071 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 1072 spin_unlock_bh(&conn->session->lock);
3219e529 1073 return -ENODATA;
7996a778 1074 }
7996a778 1075
9c19a7d0
MC		 1076 if (conn->task) {
1077 rc = iscsi_xmit_task(conn);
3219e529 1078 if (rc)
7996a778 1079 goto again;
7996a778
MC		 1080 }
1081
77a23c21
MC		 1082 /*
1083 * process mgmt pdus like nops before commands since we should
1084 * only have one nop-out as a ping from us and targets should not
1085 * overflow us with nop-ins
1086 */
1087check_mgmt:
843c0a8a 1088 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1089 conn->task = list_entry(conn->mgmtqueue.next,
1090 struct iscsi_task, running);
1091 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1092 __iscsi_put_task(conn->task);
1093 conn->task = NULL;
b3a7ea8d
MC		 1094 continue;
1095 }
9c19a7d0 1096 rc = iscsi_xmit_task(conn);
77a23c21
MC		 1097 if (rc)
1098 goto again;
7996a778
MC		 1099 }
1100
843c0a8a 1101 /* process pending command queue */
b6c395ed 1102 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 1103 if (conn->tmf_state == TMF_QUEUED)
1104 break;
1105
9c19a7d0
MC		 1106 conn->task = list_entry(conn->xmitqueue.next,
1107 struct iscsi_task, running);
b3a7ea8d 1108 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9c19a7d0 1109 fail_command(conn, conn->task, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 1110 continue;
1111 }
9c19a7d0
MC		 1112 if (iscsi_prep_scsi_cmd_pdu(conn->task)) {
1113 fail_command(conn, conn->task, DID_ABORT << 16);
004d6530
BH		 1114 continue;
1115 }
9c19a7d0 1116 rc = iscsi_xmit_task(conn);
77a23c21 1117 if (rc)
60ecebf5 1118 goto again;
77a23c21 1119 /*
9c19a7d0 1120 * we could continuously get new task requests so
77a23c21
MC		 1121 * we need to check the mgmt queue for nops that need to
1122 * be sent to aviod starvation
1123 */
843c0a8a
MC		 1124 if (!list_empty(&conn->mgmtqueue))
1125 goto check_mgmt;
1126 }
1127
1128 while (!list_empty(&conn->requeue)) {
1129 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
1130 break;
1131
b3a7ea8d
MC		 1132 /*
1133 * we always do fastlogout - conn stop code will clean up.
1134 */
1135 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1136 break;
1137
9c19a7d0
MC		 1138 conn->task = list_entry(conn->requeue.next,
1139 struct iscsi_task, running);
1140 conn->task->state = ISCSI_TASK_RUNNING;
843c0a8a 1141 list_move_tail(conn->requeue.next, &conn->run_list);
9c19a7d0 1142 rc = iscsi_xmit_task(conn);
843c0a8a
MC		 1143 if (rc)
1144 goto again;
1145 if (!list_empty(&conn->mgmtqueue))
77a23c21 1146 goto check_mgmt;
7996a778 1147 }
b6c395ed 1148 spin_unlock_bh(&conn->session->lock);
3219e529 1149 return -ENODATA;
7996a778
MC		 1150
1151again:
1152 if (unlikely(conn->suspend_tx))
77a23c21
MC		 1153 rc = -ENODATA;
1154 spin_unlock_bh(&conn->session->lock);
3219e529 1155 return rc;
7996a778
MC		 1156}
1157
c4028958 1158static void iscsi_xmitworker(struct work_struct *work)
7996a778 1159{
c4028958
DH		 1160 struct iscsi_conn *conn =
1161 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1162 int rc;
7996a778
MC		 1163 /*
1164 * serialize Xmit worker on a per-connection basis.
1165 */
3219e529
MC		 1166 do {
1167 rc = iscsi_data_xmit(conn);
1168 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1169}
1170
1171enum {
1172 FAILURE_BAD_HOST = 1,
1173 FAILURE_SESSION_FAILED,
1174 FAILURE_SESSION_FREED,
1175 FAILURE_WINDOW_CLOSED,
60ecebf5 1176 FAILURE_OOM,
7996a778 1177 FAILURE_SESSION_TERMINATE,
656cffc9 1178 FAILURE_SESSION_IN_RECOVERY,
7996a778 1179 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1180 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1181 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1182};
1183
1184int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1185{
75613521 1186 struct iscsi_cls_session *cls_session;
7996a778
MC		 1187 struct Scsi_Host *host;
1188 int reason = 0;
1189 struct iscsi_session *session;
1190 struct iscsi_conn *conn;
9c19a7d0 1191 struct iscsi_task *task = NULL;
7996a778
MC		 1192
1193 sc->scsi_done = done;
1194 sc->result = 0;
f47f2cf5 1195 sc->SCp.ptr = NULL;
7996a778
MC		 1196
1197 host = sc->device->host;
1040c99d 1198 spin_unlock(host->host_lock);
7996a778 1199
75613521
MC		 1200 cls_session = starget_to_session(scsi_target(sc->device));
1201 session = cls_session->dd_data;
7996a778
MC		 1202 spin_lock(&session->lock);
1203
75613521 1204 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1205 if (reason) {
1206 sc->result = reason;
1207 goto fault;
1208 }
1209
656cffc9
MC		 1210 /*
1211 * ISCSI_STATE_FAILED is a temp. state. The recovery
1212 * code will decide what is best to do with command queued
1213 * during this time
1214 */
1215 if (session->state != ISCSI_STATE_LOGGED_IN &&
1216 session->state != ISCSI_STATE_FAILED) {
1217 /*
1218 * to handle the race between when we set the recovery state
1219 * and block the session we requeue here (commands could
1220 * be entering our queuecommand while a block is starting
1221 * up because the block code is not locked)
1222 */
9000bcd6
MC		 1223 switch (session->state) {
1224 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1225 reason = FAILURE_SESSION_IN_RECOVERY;
d6d13ee1 1226 goto reject;
9000bcd6
MC		 1227 case ISCSI_STATE_LOGGING_OUT:
1228 reason = FAILURE_SESSION_LOGGING_OUT;
d6d13ee1 1229 goto reject;
b3a7ea8d 1230 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1231 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1232 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1233 break;
1234 case ISCSI_STATE_TERMINATE:
656cffc9 1235 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1236 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1237 break;
b3a7ea8d 1238 default:
656cffc9 1239 reason = FAILURE_SESSION_FREED;
6eabafbe 1240 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1241 }
7996a778
MC		 1242 goto fault;
1243 }
1244
7996a778 1245 conn = session->leadconn;
98644047
MC		 1246 if (!conn) {
1247 reason = FAILURE_SESSION_FREED;
6eabafbe 1248 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1249 goto fault;
1250 }
7996a778 1251
77a23c21
MC		 1252 if (iscsi_check_cmdsn_window_closed(conn)) {
1253 reason = FAILURE_WINDOW_CLOSED;
1254 goto reject;
1255 }
1256
9c19a7d0 1257 if (!__kfifo_get(session->cmdpool.queue, (void*)&task,
60ecebf5
MC		 1258 sizeof(void*))) {
1259 reason = FAILURE_OOM;
1260 goto reject;
1261 }
7996a778 1262 sc->SCp.phase = session->age;
9c19a7d0 1263 sc->SCp.ptr = (char *)task;
7996a778 1264
9c19a7d0
MC		 1265 atomic_set(&task->refcount, 1);
1266 task->state = ISCSI_TASK_PENDING;
1267 task->conn = conn;
1268 task->sc = sc;
1269 INIT_LIST_HEAD(&task->running);
1270 list_add_tail(&task->running, &conn->xmitqueue);
7996a778 1271
052d0144 1272 if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) {
9c19a7d0 1273 if (iscsi_prep_scsi_cmd_pdu(task)) {
052d0144
MC		 1274 sc->result = DID_ABORT << 16;
1275 sc->scsi_done = NULL;
9c19a7d0 1276 iscsi_complete_command(task);
052d0144
MC		 1277 goto fault;
1278 }
9c19a7d0 1279 if (session->tt->xmit_task(task)) {
052d0144 1280 sc->scsi_done = NULL;
9c19a7d0 1281 iscsi_complete_command(task);
052d0144
MC		 1282 reason = FAILURE_SESSION_NOT_READY;
1283 goto reject;
1284 }
1285 } else
1286 scsi_queue_work(session->host, &conn->xmitwork);
1287
1288 session->queued_cmdsn++;
1289 spin_unlock(&session->lock);
1040c99d 1290 spin_lock(host->host_lock);
7996a778
MC		 1291 return 0;
1292
1293reject:
1294 spin_unlock(&session->lock);
1295 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1040c99d 1296 spin_lock(host->host_lock);
d6d13ee1 1297 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778
MC		 1298
1299fault:
1300 spin_unlock(&session->lock);
6eabafbe 1301 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
c07d4444
BH		 1302 if (!scsi_bidi_cmnd(sc))
1303 scsi_set_resid(sc, scsi_bufflen(sc));
1304 else {
1305 scsi_out(sc)->resid = scsi_out(sc)->length;
1306 scsi_in(sc)->resid = scsi_in(sc)->length;
1307 }
052d0144 1308 done(sc);
1040c99d 1309 spin_lock(host->host_lock);
7996a778
MC		 1310 return 0;
1311}
1312EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1313
1314int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1315{
1316 if (depth > ISCSI_MAX_CMD_PER_LUN)
1317 depth = ISCSI_MAX_CMD_PER_LUN;
1318 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1319 return sdev->queue_depth;
1320}
1321EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1322
7996a778
MC		 1323void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1324{
75613521 1325 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 1326
1327 spin_lock_bh(&session->lock);
1328 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1329 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1330 if (session->leadconn)
1331 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1332 }
1333 spin_unlock_bh(&session->lock);
1334}
1335EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1336
1337int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1338{
75613521
MC		 1339 struct iscsi_cls_session *cls_session;
1340 struct iscsi_session *session;
1341 struct iscsi_conn *conn;
1342
1343 cls_session = starget_to_session(scsi_target(sc->device));
1344 session = cls_session->dd_data;
1345 conn = session->leadconn;
7996a778 1346
bc436b27 1347 mutex_lock(&session->eh_mutex);
7996a778
MC		 1348 spin_lock_bh(&session->lock);
1349 if (session->state == ISCSI_STATE_TERMINATE) {
1350failed:
1351 debug_scsi("failing host reset: session terminated "
d6e24d1c 1352 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1353 spin_unlock_bh(&session->lock);
bc436b27 1354 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1355 return FAILED;
1356 }
1357
7996a778 1358 spin_unlock_bh(&session->lock);
bc436b27 1359 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1360 /*
1361 * we drop the lock here but the leadconn cannot be destoyed while
1362 * we are in the scsi eh
1363 */
843c0a8a 1364 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1365
1366 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1367 wait_event_interruptible(conn->ehwait,
1368 session->state == ISCSI_STATE_TERMINATE ||
1369 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1370 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1371 if (signal_pending(current))
1372 flush_signals(current);
1373
bc436b27 1374 mutex_lock(&session->eh_mutex);
7996a778
MC		 1375 spin_lock_bh(&session->lock);
1376 if (session->state == ISCSI_STATE_LOGGED_IN)
322d739d
MC		 1377 iscsi_session_printk(KERN_INFO, session,
1378 "host reset succeeded\n");
7996a778
MC		 1379 else
1380 goto failed;
1381 spin_unlock_bh(&session->lock);
bc436b27 1382 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1383 return SUCCESS;
1384}
1385EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1386
843c0a8a 1387static void iscsi_tmf_timedout(unsigned long data)
7996a778 1388{
843c0a8a 1389 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1390 struct iscsi_session *session = conn->session;
1391
1392 spin_lock(&session->lock);
843c0a8a
MC		 1393 if (conn->tmf_state == TMF_QUEUED) {
1394 conn->tmf_state = TMF_TIMEDOUT;
1395 debug_scsi("tmf timedout\n");
7996a778
MC		 1396 /* unblock eh_abort() */
1397 wake_up(&conn->ehwait);
1398 }
1399 spin_unlock(&session->lock);
1400}
1401
9c19a7d0 1402static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1403 struct iscsi_tm *hdr, int age,
1404 int timeout)
7996a778 1405{
7996a778 1406 struct iscsi_session *session = conn->session;
9c19a7d0 1407 struct iscsi_task *task;
7996a778 1408
9c19a7d0 1409 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1410 NULL, 0);
9c19a7d0 1411 if (!task) {
6724add1 1412 spin_unlock_bh(&session->lock);
7996a778 1413 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1414 spin_lock_bh(&session->lock);
1415 debug_scsi("tmf exec failure\n");
77a23c21 1416 return -EPERM;
7996a778 1417 }
843c0a8a 1418 conn->tmfcmd_pdus_cnt++;
f6d5180c 1419 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1420 conn->tmf_timer.function = iscsi_tmf_timedout;
1421 conn->tmf_timer.data = (unsigned long)conn;
1422 add_timer(&conn->tmf_timer);
1423 debug_scsi("tmf set timeout\n");
7996a778 1424
7996a778 1425 spin_unlock_bh(&session->lock);
6724add1 1426 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1427
1428 /*
1429 * block eh thread until:
1430 *
843c0a8a
MC		 1431 * 1) tmf response
1432 * 2) tmf timeout
7996a778
MC		 1433 * 3) session is terminated or restarted or userspace has
1434 * given up on recovery
1435 */
843c0a8a 1436 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1437 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1438 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1439 if (signal_pending(current))
1440 flush_signals(current);
843c0a8a
MC		 1441 del_timer_sync(&conn->tmf_timer);
1442
6724add1 1443 mutex_lock(&session->eh_mutex);
77a23c21 1444 spin_lock_bh(&session->lock);
9c19a7d0 1445 /* if the session drops it will clean up the task */
843c0a8a
MC		 1446 if (age != session->age ||
1447 session->state != ISCSI_STATE_LOGGED_IN)
1448 return -ENOTCONN;
7996a778
MC		 1449 return 0;
1450}
1451
843c0a8a
MC		 1452/*
1453 * Fail commands. session lock held and recv side suspended and xmit
1454 * thread flushed
1455 */
6eabafbe
MC		 1456static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1457 int error)
843c0a8a 1458{
9c19a7d0 1459 struct iscsi_task *task, *tmp;
843c0a8a 1460
9c19a7d0
MC		 1461 if (conn->task && (conn->task->sc->device->lun == lun || lun == -1))
1462 conn->task = NULL;
843c0a8a
MC		 1463
1464 /* flush pending */
9c19a7d0
MC		 1465 list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) {
1466 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1467 debug_scsi("failing pending sc %p itt 0x%x\n",
9c19a7d0
MC		 1468 task->sc, task->itt);
1469 fail_command(conn, task, error << 16);
843c0a8a
MC		 1470 }
1471 }
1472
9c19a7d0
MC		 1473 list_for_each_entry_safe(task, tmp, &conn->requeue, running) {
1474 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1475 debug_scsi("failing requeued sc %p itt 0x%x\n",
9c19a7d0
MC		 1476 task->sc, task->itt);
1477 fail_command(conn, task, error << 16);
843c0a8a
MC		 1478 }
1479 }
1480
1481 /* fail all other running */
9c19a7d0
MC		 1482 list_for_each_entry_safe(task, tmp, &conn->run_list, running) {
1483 if (lun == task->sc->device->lun || lun == -1) {
843c0a8a 1484 debug_scsi("failing in progress sc %p itt 0x%x\n",
9c19a7d0 1485 task->sc, task->itt);
ac26d41d 1486 fail_command(conn, task, error << 16);
843c0a8a
MC		 1487 }
1488 }
1489}
1490
b40977d9 1491void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1
MC		 1492{
1493 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
052d0144
MC		 1494 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1495 scsi_flush_work(conn->session->host);
6724add1 1496}
b40977d9 1497EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1498
1499static void iscsi_start_tx(struct iscsi_conn *conn)
1500{
1501 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
052d0144
MC		 1502 if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD))
1503 scsi_queue_work(conn->session->host, &conn->xmitwork);
6724add1
MC		 1504}
1505
242f9dcb 1506static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
f6d5180c
MC		 1507{
1508 struct iscsi_cls_session *cls_session;
1509 struct iscsi_session *session;
1510 struct iscsi_conn *conn;
242f9dcb 1511 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
f6d5180c
MC		 1512
1513 cls_session = starget_to_session(scsi_target(scmd->device));
75613521 1514 session = cls_session->dd_data;
f6d5180c
MC		 1515
1516 debug_scsi("scsi cmd %p timedout\n", scmd);
1517
1518 spin_lock(&session->lock);
1519 if (session->state != ISCSI_STATE_LOGGED_IN) {
1520 /*
1521 * We are probably in the middle of iscsi recovery so let
1522 * that complete and handle the error.
1523 */
242f9dcb 1524 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1525 goto done;
1526 }
1527
1528 conn = session->leadconn;
1529 if (!conn) {
1530 /* In the middle of shuting down */
242f9dcb 1531 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1532 goto done;
1533 }
1534
1535 if (!conn->recv_timeout && !conn->ping_timeout)
1536 goto done;
1537 /*
1538 * if the ping timedout then we are in the middle of cleaning up
1539 * and can let the iscsi eh handle it
1540 */
1541 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1542 (conn->ping_timeout * HZ), jiffies))
242f9dcb 1543 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1544 /*
1545 * if we are about to check the transport then give the command
1546 * more time
1547 */
1548 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1549 jiffies))
242f9dcb 1550 rc = BLK_EH_RESET_TIMER;
f6d5180c 1551 /* if in the middle of checking the transport then give us more time */
9c19a7d0 1552 if (conn->ping_task)
242f9dcb 1553 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1554done:
1555 spin_unlock(&session->lock);
242f9dcb
JA		 1556 debug_scsi("return %s\n", rc == BLK_EH_RESET_TIMER ?
1557 "timer reset" : "nh");
f6d5180c
MC		 1558 return rc;
1559}
1560
1561static void iscsi_check_transport_timeouts(unsigned long data)
1562{
1563 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1564 struct iscsi_session *session = conn->session;
4cf10435 1565 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c
MC		 1566
1567 spin_lock(&session->lock);
1568 if (session->state != ISCSI_STATE_LOGGED_IN)
1569 goto done;
1570
4cf10435
MC		 1571 recv_timeout = conn->recv_timeout;
1572 if (!recv_timeout)
f6d5180c
MC		 1573 goto done;
1574
4cf10435 1575 recv_timeout *= HZ;
f6d5180c 1576 last_recv = conn->last_recv;
9c19a7d0 1577 if (conn->ping_task &&
4cf10435 1578 time_before_eq(conn->last_ping + (conn->ping_timeout * HZ),
f6d5180c 1579 jiffies)) {
322d739d
MC		 1580 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1581 "expired, last rx %lu, last ping %lu, "
1582 "now %lu\n", conn->ping_timeout, last_recv,
1583 conn->last_ping, jiffies);
f6d5180c
MC		 1584 spin_unlock(&session->lock);
1585 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1586 return;
1587 }
1588
4cf10435 1589 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97
MC		 1590 /* send a ping to try to provoke some traffic */
1591 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1592 iscsi_send_nopout(conn, NULL);
4cf10435 1593 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 1594 } else
4cf10435 1595 next_timeout = last_recv + recv_timeout;
f6d5180c 1596
ad294e9c
MC		 1597 debug_scsi("Setting next tmo %lu\n", next_timeout);
1598 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 1599done:
1600 spin_unlock(&session->lock);
1601}
1602
9c19a7d0 1603static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 1604 struct iscsi_tm *hdr)
1605{
1606 memset(hdr, 0, sizeof(*hdr));
1607 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1608 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1609 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
9c19a7d0
MC		 1610 memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun));
1611 hdr->rtt = task->hdr->itt;
1612 hdr->refcmdsn = task->hdr->cmdsn;
843c0a8a
MC		 1613}
1614
7996a778
MC		 1615int iscsi_eh_abort(struct scsi_cmnd *sc)
1616{
75613521
MC		 1617 struct iscsi_cls_session *cls_session;
1618 struct iscsi_session *session;
f47f2cf5 1619 struct iscsi_conn *conn;
9c19a7d0 1620 struct iscsi_task *task;
843c0a8a
MC		 1621 struct iscsi_tm *hdr;
1622 int rc, age;
7996a778 1623
75613521
MC		 1624 cls_session = starget_to_session(scsi_target(sc->device));
1625 session = cls_session->dd_data;
1626
6724add1
MC		 1627 mutex_lock(&session->eh_mutex);
1628 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1629 /*
1630 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1631 * got the command.
1632 */
1633 if (!sc->SCp.ptr) {
1634 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1635 spin_unlock_bh(&session->lock);
1636 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1637 return SUCCESS;
1638 }
1639
7996a778
MC		 1640 /*
1641 * If we are not logged in or we have started a new session
1642 * then let the host reset code handle this
1643 */
843c0a8a
MC		 1644 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1645 sc->SCp.phase != session->age) {
1646 spin_unlock_bh(&session->lock);
1647 mutex_unlock(&session->eh_mutex);
1648 return FAILED;
1649 }
1650
1651 conn = session->leadconn;
1652 conn->eh_abort_cnt++;
1653 age = session->age;
1654
9c19a7d0
MC		 1655 task = (struct iscsi_task *)sc->SCp.ptr;
1656 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, task->itt);
7996a778 1657
9c19a7d0
MC		 1658 /* task completed before time out */
1659 if (!task->sc) {
7ea8b828 1660 debug_scsi("sc completed while abort in progress\n");
77a23c21 1661 goto success;
7ea8b828 1662 }
7996a778 1663
9c19a7d0
MC		 1664 if (task->state == ISCSI_TASK_PENDING) {
1665 fail_command(conn, task, DID_ABORT << 16);
77a23c21
MC		 1666 goto success;
1667 }
7996a778 1668
843c0a8a
MC		 1669 /* only have one tmf outstanding at a time */
1670 if (conn->tmf_state != TMF_INITIAL)
7996a778 1671 goto failed;
843c0a8a 1672 conn->tmf_state = TMF_QUEUED;
7996a778 1673
843c0a8a 1674 hdr = &conn->tmhdr;
9c19a7d0 1675 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 1676
9c19a7d0 1677 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1678 rc = FAILED;
1679 goto failed;
1680 }
1681
1682 switch (conn->tmf_state) {
1683 case TMF_SUCCESS:
77a23c21 1684 spin_unlock_bh(&session->lock);
913e5bf4
MC		 1685 /*
1686 * stop tx side incase the target had sent a abort rsp but
1687 * the initiator was still writing out data.
1688 */
6724add1 1689 iscsi_suspend_tx(conn);
77a23c21 1690 /*
913e5bf4
MC		 1691 * we do not stop the recv side because targets have been
1692 * good and have never sent us a successful tmf response
1693 * then sent more data for the cmd.
77a23c21 1694 */
77a23c21 1695 spin_lock(&session->lock);
9c19a7d0 1696 fail_command(conn, task, DID_ABORT << 16);
843c0a8a 1697 conn->tmf_state = TMF_INITIAL;
77a23c21 1698 spin_unlock(&session->lock);
6724add1 1699 iscsi_start_tx(conn);
77a23c21 1700 goto success_unlocked;
843c0a8a
MC		 1701 case TMF_TIMEDOUT:
1702 spin_unlock_bh(&session->lock);
1703 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1704 goto failed_unlocked;
1705 case TMF_NOT_FOUND:
1706 if (!sc->SCp.ptr) {
1707 conn->tmf_state = TMF_INITIAL;
9c19a7d0 1708 /* task completed before tmf abort response */
7ea8b828 1709 debug_scsi("sc completed while abort in progress\n");
77a23c21 1710 goto success;
7ea8b828
MC		 1711 }
1712 /* fall through */
1713 default:
843c0a8a
MC		 1714 conn->tmf_state = TMF_INITIAL;
1715 goto failed;
7996a778
MC		 1716 }
1717
77a23c21 1718success:
7996a778 1719 spin_unlock_bh(&session->lock);
77a23c21 1720success_unlocked:
9c19a7d0 1721 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, task->itt);
6724add1 1722 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1723 return SUCCESS;
1724
1725failed:
1726 spin_unlock_bh(&session->lock);
77a23c21 1727failed_unlocked:
843c0a8a 1728 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
9c19a7d0 1729 task ? task->itt : 0);
6724add1 1730 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1731 return FAILED;
1732}
1733EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1734
843c0a8a
MC		 1735static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1736{
1737 memset(hdr, 0, sizeof(*hdr));
1738 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1739 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1740 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1741 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1742 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1743}
1744
1745int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1746{
75613521
MC		 1747 struct iscsi_cls_session *cls_session;
1748 struct iscsi_session *session;
843c0a8a
MC		 1749 struct iscsi_conn *conn;
1750 struct iscsi_tm *hdr;
1751 int rc = FAILED;
1752
75613521
MC		 1753 cls_session = starget_to_session(scsi_target(sc->device));
1754 session = cls_session->dd_data;
1755
843c0a8a
MC		 1756 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1757
1758 mutex_lock(&session->eh_mutex);
1759 spin_lock_bh(&session->lock);
1760 /*
1761 * Just check if we are not logged in. We cannot check for
1762 * the phase because the reset could come from a ioctl.
1763 */
1764 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1765 goto unlock;
1766 conn = session->leadconn;
1767
1768 /* only have one tmf outstanding at a time */
1769 if (conn->tmf_state != TMF_INITIAL)
1770 goto unlock;
1771 conn->tmf_state = TMF_QUEUED;
1772
1773 hdr = &conn->tmhdr;
1774 iscsi_prep_lun_reset_pdu(sc, hdr);
1775
9c19a7d0 1776 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 1777 session->lu_reset_timeout)) {
843c0a8a
MC		 1778 rc = FAILED;
1779 goto unlock;
1780 }
1781
1782 switch (conn->tmf_state) {
1783 case TMF_SUCCESS:
1784 break;
1785 case TMF_TIMEDOUT:
1786 spin_unlock_bh(&session->lock);
1787 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1788 goto done;
1789 default:
1790 conn->tmf_state = TMF_INITIAL;
1791 goto unlock;
1792 }
1793
1794 rc = SUCCESS;
1795 spin_unlock_bh(&session->lock);
1796
1797 iscsi_suspend_tx(conn);
913e5bf4 1798
843c0a8a 1799 spin_lock(&session->lock);
6eabafbe 1800 fail_all_commands(conn, sc->device->lun, DID_ERROR);
843c0a8a
MC		 1801 conn->tmf_state = TMF_INITIAL;
1802 spin_unlock(&session->lock);
843c0a8a
MC		 1803
1804 iscsi_start_tx(conn);
1805 goto done;
1806
1807unlock:
1808 spin_unlock_bh(&session->lock);
1809done:
1810 debug_scsi("iscsi_eh_device_reset %s\n",
1811 rc == SUCCESS ? "SUCCESS" : "FAILED");
1812 mutex_unlock(&session->eh_mutex);
1813 return rc;
1814}
1815EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1816
6320377f
OK		 1817/*
1818 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1819 * should be accessed via kfifo_{get,put} on q->queue.
1820 * Optionally, the caller can obtain the array of object pointers
1821 * by passing in a non-NULL @items pointer
1822 */
7996a778 1823int
6320377f 1824iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1825{
6320377f 1826 int i, num_arrays = 1;
7996a778 1827
6320377f 1828 memset(q, 0, sizeof(*q));
7996a778
MC		 1829
1830 q->max = max;
6320377f
OK		 1831
1832 /* If the user passed an items pointer, he wants a copy of
1833 * the array. */
1834 if (items)
1835 num_arrays++;
1836 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1837 if (q->pool == NULL)
1838 goto enomem;
7996a778
MC		 1839
1840 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1841 GFP_KERNEL, NULL);
6320377f
OK		 1842 if (q->queue == ERR_PTR(-ENOMEM))
1843 goto enomem;
7996a778
MC		 1844
1845 for (i = 0; i < max; i++) {
6320377f 1846 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1847 if (q->pool[i] == NULL) {
6320377f
OK		 1848 q->max = i;
1849 goto enomem;
7996a778 1850 }
7996a778
MC		 1851 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1852 }
6320377f
OK		 1853
1854 if (items) {
1855 *items = q->pool + max;
1856 memcpy(*items, q->pool, max * sizeof(void *));
1857 }
1858
7996a778 1859 return 0;
6320377f
OK		 1860
1861enomem:
1862 iscsi_pool_free(q);
1863 return -ENOMEM;
7996a778
MC		 1864}
1865EXPORT_SYMBOL_GPL(iscsi_pool_init);
1866
6320377f 1867void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1868{
1869 int i;
1870
1871 for (i = 0; i < q->max; i++)
6320377f
OK		 1872 kfree(q->pool[i]);
1873 if (q->pool)
1874 kfree(q->pool);
7996a778
MC		 1875}
1876EXPORT_SYMBOL_GPL(iscsi_pool_free);
1877
a4804cd6
MC		 1878/**
1879 * iscsi_host_add - add host to system
1880 * @shost: scsi host
1881 * @pdev: parent device
1882 *
1883 * This should be called by partial offload and software iscsi drivers
1884 * to add a host to the system.
1885 */
1886int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
1887{
8e9a20ce
MC		 1888 if (!shost->can_queue)
1889 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
1890
a4804cd6
MC		 1891 return scsi_add_host(shost, pdev);
1892}
1893EXPORT_SYMBOL_GPL(iscsi_host_add);
1894
1895/**
1896 * iscsi_host_alloc - allocate a host and driver data
1897 * @sht: scsi host template
1898 * @dd_data_size: driver host data size
1899 * @qdepth: default device queue depth
1900 *
1901 * This should be called by partial offload and software iscsi drivers.
1902 * To access the driver specific memory use the iscsi_host_priv() macro.
1903 */
1904struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
1905 int dd_data_size, uint16_t qdepth)
75613521 1906{
a4804cd6
MC		 1907 struct Scsi_Host *shost;
1908
1909 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
1910 if (!shost)
1911 return NULL;
1912 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1913
75613521
MC		 1914 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1915 if (qdepth != 0)
1916 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1917 "Queue depth must be between 1 and %d.\n",
1918 qdepth, ISCSI_MAX_CMD_PER_LUN);
1919 qdepth = ISCSI_DEF_CMD_PER_LUN;
1920 }
75613521 1921 shost->cmd_per_lun = qdepth;
a4804cd6
MC		 1922 return shost;
1923}
1924EXPORT_SYMBOL_GPL(iscsi_host_alloc);
1925
1926/**
1927 * iscsi_host_remove - remove host and sessions
1928 * @shost: scsi host
1929 *
1930 * This will also remove any sessions attached to the host, but if userspace
1931 * is managing the session at the same time this will break. TODO: add
1932 * refcounting to the netlink iscsi interface so a rmmod or host hot unplug
1933 * does not remove the memory from under us.
1934 */
1935void iscsi_host_remove(struct Scsi_Host *shost)
1936{
1937 iscsi_host_for_each_session(shost, iscsi_session_teardown);
1938 scsi_remove_host(shost);
75613521 1939}
a4804cd6 1940EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 1941
a4804cd6 1942void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 1943{
1944 struct iscsi_host *ihost = shost_priv(shost);
7996a778 1945
75613521
MC		 1946 kfree(ihost->netdev);
1947 kfree(ihost->hwaddress);
1948 kfree(ihost->initiatorname);
a4804cd6 1949 scsi_host_put(shost);
75613521 1950}
a4804cd6 1951EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778
MC		 1952
1953/**
1954 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 1955 * @iscsit: iscsi transport template
75613521
MC		 1956 * @shost: scsi host
1957 * @cmds_max: session can queue
9c19a7d0 1958 * @cmd_task_size: LLD task private data size
7996a778 1959 * @initial_cmdsn: initial CmdSN
7996a778
MC		 1960 *
1961 * This can be used by software iscsi_transports that allocate
1962 * a session per scsi host.
3cf7b233
MC		 1963 *
1964 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
1965 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
1966 * for nop handling and login/logout requests.
75613521 1967 */
7996a778 1968struct iscsi_cls_session *
75613521 1969iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
3cf7b233 1970 uint16_t cmds_max, int cmd_task_size,
7970634b 1971 uint32_t initial_cmdsn, unsigned int id)
7996a778 1972{
7996a778
MC		 1973 struct iscsi_session *session;
1974 struct iscsi_cls_session *cls_session;
3cf7b233 1975 int cmd_i, scsi_cmds, total_cmds = cmds_max;
8e9a20ce
MC		 1976
1977 if (!total_cmds)
1978 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 1979 /*
3cf7b233
MC		 1980 * The iscsi layer needs some tasks for nop handling and tmfs,
1981 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
1982 * + 1 command for scsi IO.
3e5c28ad 1983 */
3cf7b233
MC		 1984 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
1985 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
1986 "must be a power of two that is at least %d.\n",
1987 total_cmds, ISCSI_TOTAL_CMDS_MIN);
1988 return NULL;
1989 }
1990
1991 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
1992 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
1993 "must be a power of 2 less than or equal to %d.\n",
1994 cmds_max, ISCSI_TOTAL_CMDS_MAX);
1995 total_cmds = ISCSI_TOTAL_CMDS_MAX;
1996 }
1997
1998 if (!is_power_of_2(total_cmds)) {
1999 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2000 "must be a power of 2.\n", total_cmds);
2001 total_cmds = rounddown_pow_of_two(total_cmds);
2002 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2003 return NULL;
2004 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2005 total_cmds);
1548271e 2006 }
3cf7b233 2007 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2008
5d91e209
MC		 2009 cls_session = iscsi_alloc_session(shost, iscsit,
2010 sizeof(struct iscsi_session));
75613521 2011 if (!cls_session)
7996a778 2012 return NULL;
75613521
MC		 2013 session = cls_session->dd_data;
2014 session->cls_session = cls_session;
7996a778
MC		 2015 session->host = shost;
2016 session->state = ISCSI_STATE_FREE;
f6d5180c 2017 session->fast_abort = 1;
4cd49ea1
MC		 2018 session->lu_reset_timeout = 15;
2019 session->abort_timeout = 10;
3cf7b233
MC		 2020 session->scsi_cmds_max = scsi_cmds;
2021 session->cmds_max = total_cmds;
e0726407 2022 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2023 session->exp_cmdsn = initial_cmdsn + 1;
2024 session->max_cmdsn = initial_cmdsn + 1;
2025 session->max_r2t = 1;
2026 session->tt = iscsit;
6724add1 2027 mutex_init(&session->eh_mutex);
75613521 2028 spin_lock_init(&session->lock);
7996a778
MC		 2029
2030 /* initialize SCSI PDU commands pool */
2031 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2032 (void***)&session->cmds,
9c19a7d0 2033 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2034 goto cmdpool_alloc_fail;
2035
2036 /* pre-format cmds pool with ITT */
2037 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2038 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2039
9c19a7d0
MC		 2040 if (cmd_task_size)
2041 task->dd_data = &task[1];
2042 task->itt = cmd_i;
2043 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2044 }
2045
f53a88da 2046 if (!try_module_get(iscsit->owner))
75613521 2047 goto module_get_fail;
7996a778 2048
7970634b 2049 if (iscsi_add_session(cls_session, id))
75613521 2050 goto cls_session_fail;
7996a778
MC		 2051 return cls_session;
2052
2053cls_session_fail:
75613521
MC		 2054 module_put(iscsit->owner);
2055module_get_fail:
6320377f 2056 iscsi_pool_free(&session->cmdpool);
7996a778 2057cmdpool_alloc_fail:
75613521 2058 iscsi_free_session(cls_session);
7996a778
MC		 2059 return NULL;
2060}
2061EXPORT_SYMBOL_GPL(iscsi_session_setup);
2062
2063/**
2064 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2065 * @cls_session: iscsi session
7996a778 2066 *
75613521
MC		 2067 * The driver must have called iscsi_remove_session before
2068 * calling this.
2069 */
7996a778
MC		 2070void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2071{
75613521 2072 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2073 struct module *owner = cls_session->transport->owner;
7996a778 2074
6320377f 2075 iscsi_pool_free(&session->cmdpool);
7996a778 2076
b2c64167
MC		 2077 kfree(session->password);
2078 kfree(session->password_in);
2079 kfree(session->username);
2080 kfree(session->username_in);
f3ff0c36 2081 kfree(session->targetname);
88dfd340
MC		 2082 kfree(session->initiatorname);
2083 kfree(session->ifacename);
f3ff0c36 2084
75613521 2085 iscsi_destroy_session(cls_session);
63f75cc8 2086 module_put(owner);
7996a778
MC		 2087}
2088EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2089
2090/**
2091 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2092 * @cls_session: iscsi_cls_session
5d91e209 2093 * @dd_size: private driver data size
7996a778 2094 * @conn_idx: cid
5d91e209 2095 */
7996a778 2096struct iscsi_cls_conn *
5d91e209
MC		 2097iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2098 uint32_t conn_idx)
7996a778 2099{
75613521 2100 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2101 struct iscsi_conn *conn;
2102 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2103 char *data;
7996a778 2104
5d91e209
MC		 2105 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2106 conn_idx);
7996a778
MC		 2107 if (!cls_conn)
2108 return NULL;
2109 conn = cls_conn->dd_data;
5d91e209 2110 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2111
5d91e209 2112 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2113 conn->session = session;
2114 conn->cls_conn = cls_conn;
2115 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2116 conn->id = conn_idx;
2117 conn->exp_statsn = 0;
843c0a8a 2118 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 2119
2120 init_timer(&conn->transport_timer);
2121 conn->transport_timer.data = (unsigned long)conn;
2122 conn->transport_timer.function = iscsi_check_transport_timeouts;
2123
7996a778
MC		 2124 INIT_LIST_HEAD(&conn->run_list);
2125 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 2126 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 2127 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 2128 INIT_LIST_HEAD(&conn->requeue);
c4028958 2129 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2130
9c19a7d0 2131 /* allocate login_task used for the login/text sequences */
7996a778 2132 spin_lock_bh(&session->lock);
3e5c28ad 2133 if (!__kfifo_get(session->cmdpool.queue,
9c19a7d0 2134 (void*)&conn->login_task,
7996a778
MC		 2135 sizeof(void*))) {
2136 spin_unlock_bh(&session->lock);
9c19a7d0 2137 goto login_task_alloc_fail;
7996a778
MC		 2138 }
2139 spin_unlock_bh(&session->lock);
2140
bf32ed33 2141 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3 2142 if (!data)
9c19a7d0
MC		 2143 goto login_task_data_alloc_fail;
2144 conn->login_task->data = conn->data = data;
d36ab6f3 2145
843c0a8a 2146 init_timer(&conn->tmf_timer);
7996a778
MC		 2147 init_waitqueue_head(&conn->ehwait);
2148
2149 return cls_conn;
2150
9c19a7d0
MC		 2151login_task_data_alloc_fail:
2152 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2153 sizeof(void*));
9c19a7d0 2154login_task_alloc_fail:
7996a778
MC		 2155 iscsi_destroy_conn(cls_conn);
2156 return NULL;
2157}
2158EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2159
2160/**
2161 * iscsi_conn_teardown - teardown iscsi connection
2162 * cls_conn: iscsi class connection
2163 *
2164 * TODO: we may need to make this into a two step process
2165 * like scsi-mls remove + put host
2166 */
2167void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2168{
2169 struct iscsi_conn *conn = cls_conn->dd_data;
2170 struct iscsi_session *session = conn->session;
2171 unsigned long flags;
2172
f6d5180c
MC		 2173 del_timer_sync(&conn->transport_timer);
2174
7996a778
MC		 2175 spin_lock_bh(&session->lock);
2176 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2177 if (session->leadconn == conn) {
2178 /*
2179 * leading connection? then give up on recovery.
2180 */
2181 session->state = ISCSI_STATE_TERMINATE;
2182 wake_up(&conn->ehwait);
2183 }
2184 spin_unlock_bh(&session->lock);
2185
7996a778
MC		 2186 /*
2187 * Block until all in-progress commands for this connection
2188 * time out or fail.
2189 */
2190 for (;;) {
2191 spin_lock_irqsave(session->host->host_lock, flags);
2192 if (!session->host->host_busy) { /* OK for ERL == 0 */
2193 spin_unlock_irqrestore(session->host->host_lock, flags);
2194 break;
2195 }
2196 spin_unlock_irqrestore(session->host->host_lock, flags);
2197 msleep_interruptible(500);
322d739d
MC		 2198 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2199 "host_busy %d host_failed %d\n",
2200 session->host->host_busy,
2201 session->host->host_failed);
7996a778
MC		 2202 /*
2203 * force eh_abort() to unblock
2204 */
2205 wake_up(&conn->ehwait);
2206 }
2207
779ea120 2208 /* flush queued up work because we free the connection below */
843c0a8a 2209 iscsi_suspend_tx(conn);
779ea120 2210
7996a778 2211 spin_lock_bh(&session->lock);
c8dc1e52 2212 kfree(conn->data);
f3ff0c36 2213 kfree(conn->persistent_address);
9c19a7d0 2214 __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task,
7996a778 2215 sizeof(void*));
e0726407 2216 if (session->leadconn == conn)
7996a778 2217 session->leadconn = NULL;
7996a778
MC		 2218 spin_unlock_bh(&session->lock);
2219
7996a778
MC		 2220 iscsi_destroy_conn(cls_conn);
2221}
2222EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2223
2224int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2225{
2226 struct iscsi_conn *conn = cls_conn->dd_data;
2227 struct iscsi_session *session = conn->session;
2228
ffd0436e 2229 if (!session) {
322d739d
MC		 2230 iscsi_conn_printk(KERN_ERR, conn,
2231 "can't start unbound connection\n");
7996a778
MC		 2232 return -EPERM;
2233 }
2234
db98ccde
MC		 2235 if ((session->imm_data_en || !session->initial_r2t_en) &&
2236 session->first_burst > session->max_burst) {
322d739d
MC		 2237 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2238 "first_burst %d max_burst %d\n",
2239 session->first_burst, session->max_burst);
ffd0436e
MC		 2240 return -EINVAL;
2241 }
2242
f6d5180c 2243 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2244 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2245 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2246 conn->recv_timeout = 5;
2247 }
2248
2249 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2250 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2251 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2252 conn->ping_timeout = 5;
2253 }
2254
7996a778
MC		 2255 spin_lock_bh(&session->lock);
2256 conn->c_stage = ISCSI_CONN_STARTED;
2257 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2258 session->queued_cmdsn = session->cmdsn;
7996a778 2259
f6d5180c
MC		 2260 conn->last_recv = jiffies;
2261 conn->last_ping = jiffies;
2262 if (conn->recv_timeout && conn->ping_timeout)
2263 mod_timer(&conn->transport_timer,
2264 jiffies + (conn->recv_timeout * HZ));
2265
7996a778
MC		 2266 switch(conn->stop_stage) {
2267 case STOP_CONN_RECOVER:
2268 /*
2269 * unblock eh_abort() if it is blocked. re-try all
2270 * commands after successful recovery
2271 */
7996a778 2272 conn->stop_stage = 0;
843c0a8a 2273 conn->tmf_state = TMF_INITIAL;
7996a778 2274 session->age++;
8b1d0343
MC		 2275 if (session->age == 16)
2276 session->age = 0;
6eabafbe 2277 break;
7996a778 2278 case STOP_CONN_TERM:
7996a778 2279 conn->stop_stage = 0;
7996a778
MC		 2280 break;
2281 default:
2282 break;
2283 }
2284 spin_unlock_bh(&session->lock);
2285
75613521 2286 iscsi_unblock_session(session->cls_session);
6eabafbe 2287 wake_up(&conn->ehwait);
7996a778
MC		 2288 return 0;
2289}
2290EXPORT_SYMBOL_GPL(iscsi_conn_start);
2291
2292static void
2293flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2294{
9c19a7d0 2295 struct iscsi_task *task, *tmp;
7996a778
MC		 2296
2297 /* handle pending */
9c19a7d0
MC		 2298 list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) {
2299 debug_scsi("flushing pending mgmt task itt 0x%x\n", task->itt);
2300 /* release ref from prep task */
2301 __iscsi_put_task(task);
7996a778
MC		 2302 }
2303
2304 /* handle running */
9c19a7d0
MC		 2305 list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) {
2306 debug_scsi("flushing running mgmt task itt 0x%x\n", task->itt);
2307 /* release ref from prep task */
2308 __iscsi_put_task(task);
7996a778
MC		 2309 }
2310
9c19a7d0 2311 conn->task = NULL;
7996a778
MC		 2312}
2313
656cffc9
MC		 2314static void iscsi_start_session_recovery(struct iscsi_session *session,
2315 struct iscsi_conn *conn, int flag)
7996a778 2316{
ed2abc7f
MC		 2317 int old_stop_stage;
2318
f6d5180c
MC		 2319 del_timer_sync(&conn->transport_timer);
2320
6724add1 2321 mutex_lock(&session->eh_mutex);
7996a778 2322 spin_lock_bh(&session->lock);
ed2abc7f 2323 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2324 spin_unlock_bh(&session->lock);
6724add1
MC		 2325 mutex_unlock(&session->eh_mutex);
2326 return;
2327 }
2328
ed2abc7f
MC		 2329 /*
2330 * When this is called for the in_login state, we only want to clean
9c19a7d0 2331 * up the login task and connection. We do not need to block and set
67a61114 2332 * the recovery state again
ed2abc7f 2333 */
67a61114
MC		 2334 if (flag == STOP_CONN_TERM)
2335 session->state = ISCSI_STATE_TERMINATE;
2336 else if (conn->stop_stage != STOP_CONN_RECOVER)
2337 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 2338
2339 old_stop_stage = conn->stop_stage;
7996a778 2340 conn->stop_stage = flag;
67a61114 2341 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2342 spin_unlock_bh(&session->lock);
6724add1
MC		 2343
2344 iscsi_suspend_tx(conn);
7996a778
MC		 2345 /*
2346 * for connection level recovery we should not calculate
2347 * header digest. conn->hdr_size used for optimization
2348 * in hdr_extract() and will be re-negotiated at
2349 * set_param() time.
2350 */
2351 if (flag == STOP_CONN_RECOVER) {
2352 conn->hdrdgst_en = 0;
2353 conn->datadgst_en = 0;
656cffc9 2354 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 2355 old_stop_stage != STOP_CONN_RECOVER) {
2356 debug_scsi("blocking session\n");
75613521 2357 iscsi_block_session(session->cls_session);
67a61114 2358 }
7996a778 2359 }
656cffc9 2360
656cffc9
MC		 2361 /*
2362 * flush queues.
2363 */
2364 spin_lock_bh(&session->lock);
56d7fcfa
MC		 2365 if (STOP_CONN_RECOVER)
2366 fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED);
2367 else
2368 fail_all_commands(conn, -1, DID_ERROR);
656cffc9
MC		 2369 flush_control_queues(session, conn);
2370 spin_unlock_bh(&session->lock);
6724add1 2371 mutex_unlock(&session->eh_mutex);
7996a778 2372}
7996a778
MC		 2373
2374void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2375{
2376 struct iscsi_conn *conn = cls_conn->dd_data;
2377 struct iscsi_session *session = conn->session;
2378
2379 switch (flag) {
2380 case STOP_CONN_RECOVER:
2381 case STOP_CONN_TERM:
2382 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2383 break;
7996a778 2384 default:
322d739d
MC		 2385 iscsi_conn_printk(KERN_ERR, conn,
2386 "invalid stop flag %d\n", flag);
7996a778
MC		 2387 }
2388}
2389EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2390
2391int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2392 struct iscsi_cls_conn *cls_conn, int is_leading)
2393{
75613521 2394 struct iscsi_session *session = cls_session->dd_data;
98644047 2395 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2396
7996a778 2397 spin_lock_bh(&session->lock);
7996a778
MC		 2398 if (is_leading)
2399 session->leadconn = conn;
98644047 2400 spin_unlock_bh(&session->lock);
7996a778
MC		 2401
2402 /*
2403 * Unblock xmitworker(), Login Phase will pass through.
2404 */
2405 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2406 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2407 return 0;
2408}
2409EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2410
a54a52ca
MC		 2411
2412int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2413 enum iscsi_param param, char *buf, int buflen)
2414{
2415 struct iscsi_conn *conn = cls_conn->dd_data;
2416 struct iscsi_session *session = conn->session;
2417 uint32_t value;
2418
2419 switch(param) {
843c0a8a
MC		 2420 case ISCSI_PARAM_FAST_ABORT:
2421 sscanf(buf, "%d", &session->fast_abort);
2422 break;
f6d5180c
MC		 2423 case ISCSI_PARAM_ABORT_TMO:
2424 sscanf(buf, "%d", &session->abort_timeout);
2425 break;
2426 case ISCSI_PARAM_LU_RESET_TMO:
2427 sscanf(buf, "%d", &session->lu_reset_timeout);
2428 break;
2429 case ISCSI_PARAM_PING_TMO:
2430 sscanf(buf, "%d", &conn->ping_timeout);
2431 break;
2432 case ISCSI_PARAM_RECV_TMO:
2433 sscanf(buf, "%d", &conn->recv_timeout);
2434 break;
a54a52ca
MC		 2435 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2436 sscanf(buf, "%d", &conn->max_recv_dlength);
2437 break;
2438 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2439 sscanf(buf, "%d", &conn->max_xmit_dlength);
2440 break;
2441 case ISCSI_PARAM_HDRDGST_EN:
2442 sscanf(buf, "%d", &conn->hdrdgst_en);
2443 break;
2444 case ISCSI_PARAM_DATADGST_EN:
2445 sscanf(buf, "%d", &conn->datadgst_en);
2446 break;
2447 case ISCSI_PARAM_INITIAL_R2T_EN:
2448 sscanf(buf, "%d", &session->initial_r2t_en);
2449 break;
2450 case ISCSI_PARAM_MAX_R2T:
2451 sscanf(buf, "%d", &session->max_r2t);
2452 break;
2453 case ISCSI_PARAM_IMM_DATA_EN:
2454 sscanf(buf, "%d", &session->imm_data_en);
2455 break;
2456 case ISCSI_PARAM_FIRST_BURST:
2457 sscanf(buf, "%d", &session->first_burst);
2458 break;
2459 case ISCSI_PARAM_MAX_BURST:
2460 sscanf(buf, "%d", &session->max_burst);
2461 break;
2462 case ISCSI_PARAM_PDU_INORDER_EN:
2463 sscanf(buf, "%d", &session->pdu_inorder_en);
2464 break;
2465 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2466 sscanf(buf, "%d", &session->dataseq_inorder_en);
2467 break;
2468 case ISCSI_PARAM_ERL:
2469 sscanf(buf, "%d", &session->erl);
2470 break;
2471 case ISCSI_PARAM_IFMARKER_EN:
2472 sscanf(buf, "%d", &value);
2473 BUG_ON(value);
2474 break;
2475 case ISCSI_PARAM_OFMARKER_EN:
2476 sscanf(buf, "%d", &value);
2477 BUG_ON(value);
2478 break;
2479 case ISCSI_PARAM_EXP_STATSN:
2480 sscanf(buf, "%u", &conn->exp_statsn);
2481 break;
b2c64167
MC		 2482 case ISCSI_PARAM_USERNAME:
2483 kfree(session->username);
2484 session->username = kstrdup(buf, GFP_KERNEL);
2485 if (!session->username)
2486 return -ENOMEM;
2487 break;
2488 case ISCSI_PARAM_USERNAME_IN:
2489 kfree(session->username_in);
2490 session->username_in = kstrdup(buf, GFP_KERNEL);
2491 if (!session->username_in)
2492 return -ENOMEM;
2493 break;
2494 case ISCSI_PARAM_PASSWORD:
2495 kfree(session->password);
2496 session->password = kstrdup(buf, GFP_KERNEL);
2497 if (!session->password)
2498 return -ENOMEM;
2499 break;
2500 case ISCSI_PARAM_PASSWORD_IN:
2501 kfree(session->password_in);
2502 session->password_in = kstrdup(buf, GFP_KERNEL);
2503 if (!session->password_in)
2504 return -ENOMEM;
2505 break;
a54a52ca
MC		 2506 case ISCSI_PARAM_TARGET_NAME:
2507 /* this should not change between logins */
2508 if (session->targetname)
2509 break;
2510
2511 session->targetname = kstrdup(buf, GFP_KERNEL);
2512 if (!session->targetname)
2513 return -ENOMEM;
2514 break;
2515 case ISCSI_PARAM_TPGT:
2516 sscanf(buf, "%d", &session->tpgt);
2517 break;
2518 case ISCSI_PARAM_PERSISTENT_PORT:
2519 sscanf(buf, "%d", &conn->persistent_port);
2520 break;
2521 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2522 /*
2523 * this is the address returned in discovery so it should
2524 * not change between logins.
2525 */
2526 if (conn->persistent_address)
2527 break;
2528
2529 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2530 if (!conn->persistent_address)
2531 return -ENOMEM;
2532 break;
88dfd340
MC		 2533 case ISCSI_PARAM_IFACE_NAME:
2534 if (!session->ifacename)
2535 session->ifacename = kstrdup(buf, GFP_KERNEL);
2536 break;
2537 case ISCSI_PARAM_INITIATOR_NAME:
2538 if (!session->initiatorname)
2539 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2540 break;
a54a52ca
MC		 2541 default:
2542 return -ENOSYS;
2543 }
2544
2545 return 0;
2546}
2547EXPORT_SYMBOL_GPL(iscsi_set_param);
2548
2549int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2550 enum iscsi_param param, char *buf)
2551{
75613521 2552 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 2553 int len;
2554
2555 switch(param) {
843c0a8a
MC		 2556 case ISCSI_PARAM_FAST_ABORT:
2557 len = sprintf(buf, "%d\n", session->fast_abort);
2558 break;
f6d5180c
MC		 2559 case ISCSI_PARAM_ABORT_TMO:
2560 len = sprintf(buf, "%d\n", session->abort_timeout);
2561 break;
2562 case ISCSI_PARAM_LU_RESET_TMO:
2563 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2564 break;
a54a52ca
MC		 2565 case ISCSI_PARAM_INITIAL_R2T_EN:
2566 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2567 break;
2568 case ISCSI_PARAM_MAX_R2T:
2569 len = sprintf(buf, "%hu\n", session->max_r2t);
2570 break;
2571 case ISCSI_PARAM_IMM_DATA_EN:
2572 len = sprintf(buf, "%d\n", session->imm_data_en);
2573 break;
2574 case ISCSI_PARAM_FIRST_BURST:
2575 len = sprintf(buf, "%u\n", session->first_burst);
2576 break;
2577 case ISCSI_PARAM_MAX_BURST:
2578 len = sprintf(buf, "%u\n", session->max_burst);
2579 break;
2580 case ISCSI_PARAM_PDU_INORDER_EN:
2581 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2582 break;
2583 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2584 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2585 break;
2586 case ISCSI_PARAM_ERL:
2587 len = sprintf(buf, "%d\n", session->erl);
2588 break;
2589 case ISCSI_PARAM_TARGET_NAME:
2590 len = sprintf(buf, "%s\n", session->targetname);
2591 break;
2592 case ISCSI_PARAM_TPGT:
2593 len = sprintf(buf, "%d\n", session->tpgt);
2594 break;
b2c64167
MC		 2595 case ISCSI_PARAM_USERNAME:
2596 len = sprintf(buf, "%s\n", session->username);
2597 break;
2598 case ISCSI_PARAM_USERNAME_IN:
2599 len = sprintf(buf, "%s\n", session->username_in);
2600 break;
2601 case ISCSI_PARAM_PASSWORD:
2602 len = sprintf(buf, "%s\n", session->password);
2603 break;
2604 case ISCSI_PARAM_PASSWORD_IN:
2605 len = sprintf(buf, "%s\n", session->password_in);
2606 break;
88dfd340
MC		 2607 case ISCSI_PARAM_IFACE_NAME:
2608 len = sprintf(buf, "%s\n", session->ifacename);
2609 break;
2610 case ISCSI_PARAM_INITIATOR_NAME:
2611 if (!session->initiatorname)
2612 len = sprintf(buf, "%s\n", "unknown");
2613 else
2614 len = sprintf(buf, "%s\n", session->initiatorname);
2615 break;
a54a52ca
MC		 2616 default:
2617 return -ENOSYS;
2618 }
2619
2620 return len;
2621}
2622EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2623
2624int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2625 enum iscsi_param param, char *buf)
2626{
2627 struct iscsi_conn *conn = cls_conn->dd_data;
2628 int len;
2629
2630 switch(param) {
f6d5180c
MC		 2631 case ISCSI_PARAM_PING_TMO:
2632 len = sprintf(buf, "%u\n", conn->ping_timeout);
2633 break;
2634 case ISCSI_PARAM_RECV_TMO:
2635 len = sprintf(buf, "%u\n", conn->recv_timeout);
2636 break;
a54a52ca
MC		 2637 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2638 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2639 break;
2640 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2641 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2642 break;
2643 case ISCSI_PARAM_HDRDGST_EN:
2644 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2645 break;
2646 case ISCSI_PARAM_DATADGST_EN:
2647 len = sprintf(buf, "%d\n", conn->datadgst_en);
2648 break;
2649 case ISCSI_PARAM_IFMARKER_EN:
2650 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2651 break;
2652 case ISCSI_PARAM_OFMARKER_EN:
2653 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2654 break;
2655 case ISCSI_PARAM_EXP_STATSN:
2656 len = sprintf(buf, "%u\n", conn->exp_statsn);
2657 break;
2658 case ISCSI_PARAM_PERSISTENT_PORT:
2659 len = sprintf(buf, "%d\n", conn->persistent_port);
2660 break;
2661 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2662 len = sprintf(buf, "%s\n", conn->persistent_address);
2663 break;
2664 default:
2665 return -ENOSYS;
2666 }
2667
2668 return len;
2669}
2670EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2671
0801c242
MC		 2672int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2673 char *buf)
2674{
75613521 2675 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 2676 int len;
2677
2678 switch (param) {
d8196ed2 2679 case ISCSI_HOST_PARAM_NETDEV_NAME:
75613521 2680 if (!ihost->netdev)
d8196ed2
MC		 2681 len = sprintf(buf, "%s\n", "default");
2682 else
75613521 2683 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 2684 break;
0801c242 2685 case ISCSI_HOST_PARAM_HWADDRESS:
75613521 2686 if (!ihost->hwaddress)
0801c242
MC		 2687 len = sprintf(buf, "%s\n", "default");
2688 else
75613521 2689 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 2690 break;
8ad5781a 2691 case ISCSI_HOST_PARAM_INITIATOR_NAME:
75613521 2692 if (!ihost->initiatorname)
8ad5781a
MC		 2693 len = sprintf(buf, "%s\n", "unknown");
2694 else
75613521 2695 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 2696 break;
75613521
MC		 2697 case ISCSI_HOST_PARAM_IPADDRESS:
2698 if (!strlen(ihost->local_address))
2699 len = sprintf(buf, "%s\n", "unknown");
2700 else
2701 len = sprintf(buf, "%s\n",
2702 ihost->local_address);
88dfd340 2703 break;
0801c242
MC		 2704 default:
2705 return -ENOSYS;
2706 }
2707
2708 return len;
2709}
2710EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2711
2712int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2713 char *buf, int buflen)
2714{
75613521 2715 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 2716
2717 switch (param) {
d8196ed2 2718 case ISCSI_HOST_PARAM_NETDEV_NAME:
75613521
MC		 2719 if (!ihost->netdev)
2720 ihost->netdev = kstrdup(buf, GFP_KERNEL);
d8196ed2 2721 break;
0801c242 2722 case ISCSI_HOST_PARAM_HWADDRESS:
75613521
MC		 2723 if (!ihost->hwaddress)
2724 ihost->hwaddress = kstrdup(buf, GFP_KERNEL);
0801c242 2725 break;
8ad5781a 2726 case ISCSI_HOST_PARAM_INITIATOR_NAME:
75613521
MC		 2727 if (!ihost->initiatorname)
2728 ihost->initiatorname = kstrdup(buf, GFP_KERNEL);
8ad5781a 2729 break;
0801c242
MC		 2730 default:
2731 return -ENOSYS;
2732 }
2733
2734 return 0;
2735}
2736EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2737
7996a778
MC		 2738MODULE_AUTHOR("Mike Christie");
2739MODULE_DESCRIPTION("iSCSI library functions");
2740MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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