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drm/amdgpu: Fix RAS function interface
[linux-block.git] / drivers / scsi / libiscsi.c
CommitLineData
1a59d1b8 1// SPDX-License-Identifier: GPL-2.0-or-later
7996a778
MC		 2/*
3 * iSCSI lib functions
4 *
5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2004 - 2006 Mike Christie
7 * Copyright (C) 2004 - 2005 Dmitry Yusupov
8 * Copyright (C) 2004 - 2005 Alex Aizman
9 * maintained by open-iscsi@googlegroups.com
7996a778
MC		 10 */
11#include <linux/types.h>
7996a778
MC		 12#include <linux/kfifo.h>
13#include <linux/delay.h>
11836572 14#include <linux/log2.h>
5a0e3ad6 15#include <linux/slab.h>
3f07c014 16#include <linux/sched/signal.h>
acf3368f 17#include <linux/module.h>
8eb00539 18#include <asm/unaligned.h>
7996a778
MC		 19#include <net/tcp.h>
20#include <scsi/scsi_cmnd.h>
21#include <scsi/scsi_device.h>
22#include <scsi/scsi_eh.h>
23#include <scsi/scsi_tcq.h>
24#include <scsi/scsi_host.h>
25#include <scsi/scsi.h>
26#include <scsi/iscsi_proto.h>
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_iscsi.h>
29#include <scsi/libiscsi.h>
c2332b00 30#include <trace/events/iscsi.h>
7996a778 31
bd2199d4
EZ		 32static int iscsi_dbg_lib_conn;
33module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
34 S_IRUGO | S_IWUSR);
35MODULE_PARM_DESC(debug_libiscsi_conn,
36 "Turn on debugging for connections in libiscsi module. "
37 "Set to 1 to turn on, and zero to turn off. Default is off.");
38
39static int iscsi_dbg_lib_session;
40module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
41 S_IRUGO | S_IWUSR);
42MODULE_PARM_DESC(debug_libiscsi_session,
43 "Turn on debugging for sessions in libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default is off.");
45
46static int iscsi_dbg_lib_eh;
47module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
48 S_IRUGO | S_IWUSR);
49MODULE_PARM_DESC(debug_libiscsi_eh,
50 "Turn on debugging for error handling in libiscsi module. "
51 "Set to 1 to turn on, and zero to turn off. Default is off.");
1b2c7af8
MC		 52
53#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
54 do { \
bd2199d4 55 if (iscsi_dbg_lib_conn) \
1b2c7af8
MC		 56 iscsi_conn_printk(KERN_INFO, _conn, \
57 "%s " dbg_fmt, \
58 __func__, ##arg); \
c2332b00
FH		 59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
60 &(_conn)->cls_conn->dev, \
61 "%s " dbg_fmt, __func__, ##arg);\
1b2c7af8
MC		 62 } while (0);
63
64#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
65 do { \
bd2199d4
EZ		 66 if (iscsi_dbg_lib_session) \
67 iscsi_session_printk(KERN_INFO, _session, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
c2332b00
FH		 70 iscsi_dbg_trace(trace_iscsi_dbg_session, \
71 &(_session)->cls_session->dev, \
72 "%s " dbg_fmt, __func__, ##arg); \
bd2199d4
EZ		 73 } while (0);
74
75#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
76 do { \
77 if (iscsi_dbg_lib_eh) \
1b2c7af8
MC		 78 iscsi_session_printk(KERN_INFO, _session, \
79 "%s " dbg_fmt, \
80 __func__, ##arg); \
c2332b00
FH		 81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
82 &(_session)->cls_session->dev, \
83 "%s " dbg_fmt, __func__, ##arg); \
1b2c7af8
MC		 84 } while (0);
85
32ae763e
MC		 86inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
87{
88 struct Scsi_Host *shost = conn->session->host;
89 struct iscsi_host *ihost = shost_priv(shost);
90
1336aed1
MC		 91 if (ihost->workq)
92 queue_work(ihost->workq, &conn->xmitwork);
32ae763e
MC		 93}
94EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
95
4c0ba5d2
MC		 96static void __iscsi_update_cmdsn(struct iscsi_session *session,
97 uint32_t exp_cmdsn, uint32_t max_cmdsn)
7996a778 98{
77a23c21
MC		 99 /*
100 * standard specifies this check for when to update expected and
101 * max sequence numbers
102 */
103 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
104 return;
105
106 if (exp_cmdsn != session->exp_cmdsn &&
107 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 108 session->exp_cmdsn = exp_cmdsn;
109
77a23c21 110 if (max_cmdsn != session->max_cmdsn &&
46a84c65 111 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
77a23c21 112 session->max_cmdsn = max_cmdsn;
7996a778 113}
4c0ba5d2
MC		 114
115void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
116{
117 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
118 be32_to_cpu(hdr->max_cmdsn));
119}
77a23c21 120EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 121
577577da
MC		 122/**
123 * iscsi_prep_data_out_pdu - initialize Data-Out
124 * @task: scsi command task
125 * @r2t: R2T info
126 * @hdr: iscsi data in pdu
127 *
128 * Notes:
129 * Initialize Data-Out within this R2T sequence and finds
130 * proper data_offset within this SCSI command.
131 *
132 * This function is called with connection lock taken.
133 **/
134void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
135 struct iscsi_data *hdr)
7996a778 136{
9c19a7d0 137 struct iscsi_conn *conn = task->conn;
577577da
MC		 138 unsigned int left = r2t->data_length - r2t->sent;
139
140 task->hdr_len = sizeof(struct iscsi_data);
7996a778
MC		 141
142 memset(hdr, 0, sizeof(struct iscsi_data));
577577da
MC		 143 hdr->ttt = r2t->ttt;
144 hdr->datasn = cpu_to_be32(r2t->datasn);
145 r2t->datasn++;
7996a778 146 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
55bdabdf 147 hdr->lun = task->lun;
577577da
MC		 148 hdr->itt = task->hdr_itt;
149 hdr->exp_statsn = r2t->exp_statsn;
150 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
151 if (left > conn->max_xmit_dlength) {
7996a778 152 hton24(hdr->dlength, conn->max_xmit_dlength);
577577da 153 r2t->data_count = conn->max_xmit_dlength;
7996a778
MC		 154 hdr->flags = 0;
155 } else {
577577da
MC		 156 hton24(hdr->dlength, left);
157 r2t->data_count = left;
7996a778
MC		 158 hdr->flags = ISCSI_FLAG_CMD_FINAL;
159 }
577577da 160 conn->dataout_pdus_cnt++;
7996a778 161}
577577da 162EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
7996a778 163
9c19a7d0 164static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 165{
9c19a7d0 166 unsigned exp_len = task->hdr_len + len;
004d6530 167
9c19a7d0 168 if (exp_len > task->hdr_max) {
004d6530
BH		 169 WARN_ON(1);
170 return -EINVAL;
171 }
172
173 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 174 task->hdr_len = exp_len;
004d6530
BH		 175 return 0;
176}
177
38d1c069
BH		 178/*
179 * make an extended cdb AHS
180 */
9c19a7d0 181static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 182{
9c19a7d0 183 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 184 unsigned rlen, pad_len;
185 unsigned short ahslength;
186 struct iscsi_ecdb_ahdr *ecdb_ahdr;
187 int rc;
188
9c19a7d0 189 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 190 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
191
192 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
193 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
194
195 pad_len = iscsi_padding(rlen);
196
9c19a7d0 197 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 198 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
199 if (rc)
200 return rc;
201
202 if (pad_len)
203 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
204
205 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
206 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
207 ecdb_ahdr->reserved = 0;
208 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
209
1b2c7af8
MC		 210 ISCSI_DBG_SESSION(task->conn->session,
211 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
212 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
213 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
214 task->hdr_len);
38d1c069
BH		 215 return 0;
216}
217
5d12c05e
MC		 218/**
219 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
220 * @task: iscsi task
221 * @opcode: opcode to check for
222 *
223 * During TMF a task has to be checked if it's affected.
224 * All unrelated I/O can be passed through, but I/O to the
225 * affected LUN should be restricted.
226 * If 'fast_abort' is set we won't be sending any I/O to the
227 * affected LUN.
228 * Otherwise the target is waiting for all TTTs to be completed,
229 * so we have to send all outstanding Data-Out PDUs to the target.
230 */
231static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
232{
233 struct iscsi_conn *conn = task->conn;
234 struct iscsi_tm *tmf = &conn->tmhdr;
9cb78c16 235 u64 hdr_lun;
5d12c05e
MC		 236
237 if (conn->tmf_state == TMF_INITIAL)
238 return 0;
239
240 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
241 return 0;
242
243 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
244 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
245 /*
246 * Allow PDUs for unrelated LUNs
247 */
55bdabdf 248 hdr_lun = scsilun_to_int(&tmf->lun);
5d12c05e
MC		 249 if (hdr_lun != task->sc->device->lun)
250 return 0;
df561f66 251 fallthrough;
3fe5ae8b 252 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
5d12c05e
MC		 253 /*
254 * Fail all SCSI cmd PDUs
255 */
256 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
257 iscsi_conn_printk(KERN_INFO, conn,
a17037e7 258 "task [op %x itt "
3fe5ae8b 259 "0x%x/0x%x] "
5d12c05e 260 "rejected.\n",
a17037e7
VP		 261 opcode, task->itt,
262 task->hdr_itt);
5d12c05e
MC		 263 return -EACCES;
264 }
265 /*
266 * And also all data-out PDUs in response to R2T
267 * if fast_abort is set.
268 */
269 if (conn->session->fast_abort) {
270 iscsi_conn_printk(KERN_INFO, conn,
a17037e7 271 "task [op %x itt "
3fe5ae8b 272 "0x%x/0x%x] fast abort.\n",
a17037e7
VP		 273 opcode, task->itt,
274 task->hdr_itt);
5d12c05e
MC		 275 return -EACCES;
276 }
277 break;
278 case ISCSI_TM_FUNC_ABORT_TASK:
279 /*
280 * the caller has already checked if the task
281 * they want to abort was in the pending queue so if
282 * we are here the cmd pdu has gone out already, and
283 * we will only hit this for data-outs
284 */
285 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
286 task->hdr_itt == tmf->rtt) {
287 ISCSI_DBG_SESSION(conn->session,
288 "Preventing task %x/%x from sending "
289 "data-out due to abort task in "
290 "progress\n", task->itt,
291 task->hdr_itt);
292 return -EACCES;
293 }
294 break;
295 }
296
297 return 0;
298}
299
7996a778
MC		 300/**
301 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 302 * @task: iscsi task
7996a778
MC		 303 *
304 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
305 * fields like dlength or final based on how much data it sends
306 */
9c19a7d0 307static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 308{
9c19a7d0 309 struct iscsi_conn *conn = task->conn;
7996a778 310 struct iscsi_session *session = conn->session;
9c19a7d0 311 struct scsi_cmnd *sc = task->sc;
12352183 312 struct iscsi_scsi_req *hdr;
d77e6535 313 unsigned hdrlength, cmd_len, transfer_length;
262ef636 314 itt_t itt;
004d6530 315 int rc;
7996a778 316
5d12c05e
MC		 317 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
318 if (rc)
319 return rc;
320
184b57c6
MC		 321 if (conn->session->tt->alloc_pdu) {
322 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
323 if (rc)
324 return rc;
325 }
12352183 326 hdr = (struct iscsi_scsi_req *)task->hdr;
262ef636 327 itt = hdr->itt;
577577da
MC		 328 memset(hdr, 0, sizeof(*hdr));
329
2ff79d52
MC		 330 if (session->tt->parse_pdu_itt)
331 hdr->itt = task->hdr_itt = itt;
332 else
333 hdr->itt = task->hdr_itt = build_itt(task->itt,
334 task->conn->session->age);
9c19a7d0
MC		 335 task->hdr_len = 0;
336 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 337 if (rc)
338 return rc;
a8ac6311
OK		 339 hdr->opcode = ISCSI_OP_SCSI_CMD;
340 hdr->flags = ISCSI_ATTR_SIMPLE;
55bdabdf
AG		 341 int_to_scsilun(sc->device->lun, &hdr->lun);
342 task->lun = hdr->lun;
a8ac6311 343 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 344 cmd_len = sc->cmd_len;
345 if (cmd_len < ISCSI_CDB_SIZE)
346 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
347 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 348 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 349 if (rc)
350 return rc;
351 cmd_len = ISCSI_CDB_SIZE;
352 }
353 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 354
9c19a7d0 355 task->imm_count = 0;
55e51eda
SG		 356 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
357 task->protected = true;
358
d77e6535
SG		 359 transfer_length = scsi_transfer_length(sc);
360 hdr->data_length = cpu_to_be32(transfer_length);
7996a778 361 if (sc->sc_data_direction == DMA_TO_DEVICE) {
577577da
MC		 362 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
363
7996a778
MC		 364 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
365 /*
366 * Write counters:
367 *
368 * imm_count bytes to be sent right after
369 * SCSI PDU Header
370 *
371 * unsol_count bytes(as Data-Out) to be sent
372 * without R2T ack right after
373 * immediate data
374 *
577577da 375 * r2t data_length bytes to be sent via R2T ack's
7996a778
MC		 376 *
377 * pad_count bytes to be sent as zero-padding
378 */
577577da 379 memset(r2t, 0, sizeof(*r2t));
7996a778
MC		 380
381 if (session->imm_data_en) {
d77e6535 382 if (transfer_length >= session->first_burst)
9c19a7d0 383 task->imm_count = min(session->first_burst,
7996a778
MC		 384 conn->max_xmit_dlength);
385 else
d77e6535
SG		 386 task->imm_count = min(transfer_length,
387 conn->max_xmit_dlength);
9c19a7d0 388 hton24(hdr->dlength, task->imm_count);
7996a778 389 } else
a8ac6311 390 zero_data(hdr->dlength);
7996a778 391
ffd0436e 392 if (!session->initial_r2t_en) {
d77e6535
SG		 393 r2t->data_length = min(session->first_burst,
394 transfer_length) -
577577da
MC		 395 task->imm_count;
396 r2t->data_offset = task->imm_count;
397 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
398 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e
MC		 399 }
400
577577da 401 if (!task->unsol_r2t.data_length)
7996a778 402 /* No unsolicit Data-Out's */
a8ac6311 403 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 404 } else {
7996a778
MC		 405 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
406 zero_data(hdr->dlength);
407
408 if (sc->sc_data_direction == DMA_FROM_DEVICE)
409 hdr->flags |= ISCSI_FLAG_CMD_READ;
410 }
411
004d6530 412 /* calculate size of additional header segments (AHSs) */
9c19a7d0 413 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 414
415 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
416 hdrlength /= ISCSI_PAD_LEN;
417
418 WARN_ON(hdrlength >= 256);
419 hdr->hlength = hdrlength & 0xFF;
96b1f96d 420 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
004d6530 421
577577da 422 if (session->tt->init_task && session->tt->init_task(task))
052d0144
MC		 423 return -EIO;
424
9c19a7d0 425 task->state = ISCSI_TASK_RUNNING;
d3305f34 426 session->cmdsn++;
77a23c21 427
a8ac6311 428 conn->scsicmd_pdus_cnt++;
1b2c7af8 429 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
ae3d56d8 430 "itt 0x%x len %d cmdsn %d win %d]\n",
1b2c7af8
MC		 431 sc->sc_data_direction == DMA_TO_DEVICE ?
432 "write" : "read", conn->id, sc, sc->cmnd[0],
d77e6535 433 task->itt, transfer_length,
1b2c7af8
MC		 434 session->cmdsn,
435 session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 436 return 0;
7996a778 437}
7996a778
MC		 438
439/**
3bbaaad9 440 * iscsi_free_task - free a task
9c19a7d0 441 * @task: iscsi cmd task
7996a778 442 *
659743b0 443 * Must be called with session back_lock.
3e5c28ad
MC		 444 * This function returns the scsi command to scsi-ml or cleans
445 * up mgmt tasks then returns the task to the pool.
7996a778 446 */
3bbaaad9 447static void iscsi_free_task(struct iscsi_task *task)
7996a778 448{
9c19a7d0 449 struct iscsi_conn *conn = task->conn;
c1635cb7 450 struct iscsi_session *session = conn->session;
9c19a7d0 451 struct scsi_cmnd *sc = task->sc;
f41d4721 452 int oldstate = task->state;
7996a778 453
4421c9eb
MC		 454 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
455 task->itt, task->state, task->sc);
456
577577da 457 session->tt->cleanup_task(task);
3bbaaad9 458 task->state = ISCSI_TASK_FREE;
9c19a7d0 459 task->sc = NULL;
3e5c28ad 460 /*
9c19a7d0 461 * login task is preallocated so do not free
3e5c28ad 462 */
9c19a7d0 463 if (conn->login_task == task)
3e5c28ad
MC		 464 return;
465
7acd72eb 466 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 467
3e5c28ad 468 if (sc) {
3e5c28ad
MC		 469 /* SCSI eh reuses commands to verify us */
470 sc->SCp.ptr = NULL;
471 /*
f41d4721
MC		 472 * queue command may call this to free the task, so
473 * it will decide how to return sc to scsi-ml.
3e5c28ad 474 */
f41d4721 475 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
3e5c28ad
MC		 476 sc->scsi_done(sc);
477 }
7996a778
MC		 478}
479
913e5bf4 480void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 481{
6dc618cd 482 refcount_inc(&task->refcount);
60ecebf5 483}
913e5bf4 484EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 485
8eea2f55 486void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 487{
6dc618cd 488 if (refcount_dec_and_test(&task->refcount))
3bbaaad9 489 iscsi_free_task(task);
60ecebf5 490}
8eea2f55 491EXPORT_SYMBOL_GPL(__iscsi_put_task);
60ecebf5 492
9c19a7d0 493void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 494{
9c19a7d0 495 struct iscsi_session *session = task->conn->session;
3e5c28ad 496
659743b0
SP		 497 /* regular RX path uses back_lock */
498 spin_lock_bh(&session->back_lock);
9c19a7d0 499 __iscsi_put_task(task);
659743b0 500 spin_unlock_bh(&session->back_lock);
3e5c28ad 501}
9c19a7d0 502EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 503
3bbaaad9
MC		 504/**
505 * iscsi_complete_task - finish a task
506 * @task: iscsi cmd task
b3cd5050 507 * @state: state to complete task with
3bbaaad9 508 *
659743b0 509 * Must be called with session back_lock.
3bbaaad9 510 */
b3cd5050 511static void iscsi_complete_task(struct iscsi_task *task, int state)
3bbaaad9
MC		 512{
513 struct iscsi_conn *conn = task->conn;
514
4421c9eb
MC		 515 ISCSI_DBG_SESSION(conn->session,
516 "complete task itt 0x%x state %d sc %p\n",
517 task->itt, task->state, task->sc);
b3cd5050
MC		 518 if (task->state == ISCSI_TASK_COMPLETED ||
519 task->state == ISCSI_TASK_ABRT_TMF ||
f41d4721
MC		 520 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
521 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
3bbaaad9
MC		 522 return;
523 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
b3cd5050 524 task->state = state;
3bbaaad9 525
fe0a8a95
LD		 526 if (READ_ONCE(conn->ping_task) == task)
527 WRITE_ONCE(conn->ping_task, NULL);
3bbaaad9
MC		 528
529 /* release get from queueing */
530 __iscsi_put_task(task);
531}
532
4c0ba5d2
MC		 533/**
534 * iscsi_complete_scsi_task - finish scsi task normally
535 * @task: iscsi task for scsi cmd
536 * @exp_cmdsn: expected cmd sn in cpu format
537 * @max_cmdsn: max cmd sn in cpu format
538 *
539 * This is used when drivers do not need or cannot perform
540 * lower level pdu processing.
541 *
659743b0 542 * Called with session back_lock
4c0ba5d2
MC		 543 */
544void iscsi_complete_scsi_task(struct iscsi_task *task,
545 uint32_t exp_cmdsn, uint32_t max_cmdsn)
546{
547 struct iscsi_conn *conn = task->conn;
548
549 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
550
551 conn->last_recv = jiffies;
552 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
553 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
554}
555EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
556
5923d64b
MC		 557/*
558 * Must be called with back and frwd lock
559 */
560static bool cleanup_queued_task(struct iscsi_task *task)
561{
562 struct iscsi_conn *conn = task->conn;
563 bool early_complete = false;
564
565 /* Bad target might have completed task while it was still running */
566 if (task->state == ISCSI_TASK_COMPLETED)
567 early_complete = true;
568
569 if (!list_empty(&task->running)) {
570 list_del_init(&task->running);
571 /*
572 * If it's on a list but still running, this could be from
573 * a bad target sending a rsp early, cleanup from a TMF, or
574 * session recovery.
575 */
576 if (task->state == ISCSI_TASK_RUNNING ||
577 task->state == ISCSI_TASK_COMPLETED)
578 __iscsi_put_task(task);
579 }
580
581 if (conn->task == task) {
582 conn->task = NULL;
583 __iscsi_put_task(task);
584 }
585
586 return early_complete;
587}
4c0ba5d2 588
b3a7ea8d 589/*
14936b1e
MC		 590 * session frwd lock must be held and if not called for a task that is still
591 * pending or from the xmit thread, then xmit thread must be suspended
b3a7ea8d 592 */
3bbaaad9 593static void fail_scsi_task(struct iscsi_task *task, int err)
b3a7ea8d 594{
3bbaaad9 595 struct iscsi_conn *conn = task->conn;
b3a7ea8d 596 struct scsi_cmnd *sc;
b3cd5050 597 int state;
b3a7ea8d 598
5923d64b
MC		 599 spin_lock_bh(&conn->session->back_lock);
600 if (cleanup_queued_task(task)) {
601 spin_unlock_bh(&conn->session->back_lock);
602 return;
603 }
604
b3cd5050 605 if (task->state == ISCSI_TASK_PENDING) {
b3a7ea8d
MC		 606 /*
607 * cmd never made it to the xmit thread, so we should not count
608 * the cmd in the sequencing
609 */
610 conn->session->queued_cmdsn--;
b3cd5050
MC		 611 /* it was never sent so just complete like normal */
612 state = ISCSI_TASK_COMPLETED;
613 } else if (err == DID_TRANSPORT_DISRUPTED)
614 state = ISCSI_TASK_ABRT_SESS_RECOV;
615 else
616 state = ISCSI_TASK_ABRT_TMF;
b3a7ea8d 617
14936b1e 618 sc = task->sc;
b3cd5050 619 sc->result = err << 16;
ae3d56d8 620 scsi_set_resid(sc, scsi_bufflen(sc));
b3cd5050 621 iscsi_complete_task(task, state);
659743b0 622 spin_unlock_bh(&conn->session->back_lock);
b3a7ea8d
MC		 623}
624
3e5c28ad 625static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 626 struct iscsi_task *task)
052d0144
MC		 627{
628 struct iscsi_session *session = conn->session;
577577da 629 struct iscsi_hdr *hdr = task->hdr;
052d0144 630 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
4f704dc0 631 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
052d0144
MC		 632
633 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
634 return -ENOTCONN;
635
4f704dc0 636 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
052d0144
MC		 637 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
638 /*
639 * pre-format CmdSN for outgoing PDU.
640 */
641 nop->cmdsn = cpu_to_be32(session->cmdsn);
642 if (hdr->itt != RESERVED_ITT) {
052d0144 643 /*
4f704dc0 644 * TODO: We always use immediate for normal session pdus.
052d0144
MC		 645 * If we start to send tmfs or nops as non-immediate then
646 * we should start checking the cmdsn numbers for mgmt tasks.
4f704dc0
MC		 647 *
648 * During discovery sessions iscsid sends TEXT as non immediate,
649 * but we always only send one PDU at a time.
052d0144
MC		 650 */
651 if (conn->c_stage == ISCSI_CONN_STARTED &&
652 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
653 session->queued_cmdsn++;
654 session->cmdsn++;
655 }
656 }
657
ae15f801
MC		 658 if (session->tt->init_task && session->tt->init_task(task))
659 return -EIO;
052d0144
MC		 660
661 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
662 session->state = ISCSI_STATE_LOGGING_OUT;
663
577577da 664 task->state = ISCSI_TASK_RUNNING;
1b2c7af8
MC		 665 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
666 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
667 hdr->itt, task->data_count);
052d0144
MC		 668 return 0;
669}
670
9c19a7d0 671static struct iscsi_task *
f6d5180c
MC		 672__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
673 char *data, uint32_t data_size)
674{
675 struct iscsi_session *session = conn->session;
1336aed1 676 struct iscsi_host *ihost = shost_priv(session->host);
4f704dc0 677 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
9c19a7d0 678 struct iscsi_task *task;
262ef636 679 itt_t itt;
f6d5180c
MC		 680
681 if (session->state == ISCSI_STATE_TERMINATE)
682 return NULL;
683
4f704dc0 684 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
f6d5180c
MC		 685 /*
686 * Login and Text are sent serially, in
687 * request-followed-by-response sequence.
3e5c28ad
MC		 688 * Same task can be used. Same ITT must be used.
689 * Note that login_task is preallocated at conn_create().
f6d5180c 690 */
4f704dc0
MC		 691 if (conn->login_task->state != ISCSI_TASK_FREE) {
692 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
693 "progress. Cannot start new task.\n");
694 return NULL;
695 }
696
cbaa4221
MC		 697 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
698 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
699 return NULL;
700 }
701
9c19a7d0 702 task = conn->login_task;
4f704dc0 703 } else {
26013ad4
MC		 704 if (session->state != ISCSI_STATE_LOGGED_IN)
705 return NULL;
706
cbaa4221
MC		 707 if (data_size != 0) {
708 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
709 return NULL;
710 }
711
f6d5180c
MC		 712 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
713 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
714
7acd72eb 715 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 716 (void*)&task, sizeof(void*)))
f6d5180c
MC		 717 return NULL;
718 }
3e5c28ad
MC		 719 /*
720 * released in complete pdu for task we expect a response for, and
721 * released by the lld when it has transmitted the task for
722 * pdus we do not expect a response for.
723 */
6dc618cd 724 refcount_set(&task->refcount, 1);
9c19a7d0
MC		 725 task->conn = conn;
726 task->sc = NULL;
3bbaaad9
MC		 727 INIT_LIST_HEAD(&task->running);
728 task->state = ISCSI_TASK_PENDING;
f6d5180c
MC		 729
730 if (data_size) {
9c19a7d0
MC		 731 memcpy(task->data, data, data_size);
732 task->data_count = data_size;
f6d5180c 733 } else
9c19a7d0 734 task->data_count = 0;
f6d5180c 735
184b57c6
MC		 736 if (conn->session->tt->alloc_pdu) {
737 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
738 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
739 "pdu for mgmt task.\n");
3bbaaad9 740 goto free_task;
184b57c6 741 }
577577da 742 }
184b57c6 743
262ef636 744 itt = task->hdr->itt;
577577da 745 task->hdr_len = sizeof(struct iscsi_hdr);
9c19a7d0 746 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
262ef636
MC		 747
748 if (hdr->itt != RESERVED_ITT) {
749 if (session->tt->parse_pdu_itt)
750 task->hdr->itt = itt;
751 else
752 task->hdr->itt = build_itt(task->itt,
753 task->conn->session->age);
754 }
755
fe0a8a95
LD		 756 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK))
757 WRITE_ONCE(conn->ping_task, task);
758
1336aed1 759 if (!ihost->workq) {
577577da
MC		 760 if (iscsi_prep_mgmt_task(conn, task))
761 goto free_task;
052d0144 762
9c19a7d0 763 if (session->tt->xmit_task(task))
577577da 764 goto free_task;
3bbaaad9
MC		 765 } else {
766 list_add_tail(&task->running, &conn->mgmtqueue);
32ae763e 767 iscsi_conn_queue_work(conn);
3bbaaad9 768 }
052d0144 769
9c19a7d0 770 return task;
577577da
MC		 771
772free_task:
659743b0 773 /* regular RX path uses back_lock */
4fa50799 774 spin_lock(&session->back_lock);
577577da 775 __iscsi_put_task(task);
4fa50799 776 spin_unlock(&session->back_lock);
577577da 777 return NULL;
f6d5180c
MC		 778}
779
780int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
781 char *data, uint32_t data_size)
782{
783 struct iscsi_conn *conn = cls_conn->dd_data;
784 struct iscsi_session *session = conn->session;
785 int err = 0;
786
659743b0 787 spin_lock_bh(&session->frwd_lock);
f6d5180c
MC		 788 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
789 err = -EPERM;
659743b0 790 spin_unlock_bh(&session->frwd_lock);
f6d5180c
MC		 791 return err;
792}
793EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
794
7996a778 795/**
ae6b4e69 796 * iscsi_scsi_cmd_rsp - SCSI Command Response processing
7996a778
MC		 797 * @conn: iscsi connection
798 * @hdr: iscsi header
9c19a7d0 799 * @task: scsi command task
7996a778
MC		 800 * @data: cmd data buffer
801 * @datalen: len of buffer
802 *
803 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
a656183e 804 * then completes the command and task. called under back_lock
7996a778 805 **/
77a23c21 806static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 807 struct iscsi_task *task, char *data,
77a23c21 808 int datalen)
7996a778 809{
12352183 810 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
7996a778 811 struct iscsi_session *session = conn->session;
9c19a7d0 812 struct scsi_cmnd *sc = task->sc;
7996a778 813
77a23c21 814 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 815 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
816
817 sc->result = (DID_OK << 16) | rhdr->cmd_status;
818
55e51eda
SG		 819 if (task->protected) {
820 sector_t sector;
821 u8 ascq;
822
823 /**
824 * Transports that didn't implement check_protection
825 * callback but still published T10-PI support to scsi-mid
826 * deserve this BUG_ON.
827 **/
828 BUG_ON(!session->tt->check_protection);
829
830 ascq = session->tt->check_protection(task, &sector);
831 if (ascq) {
832 sc->result = DRIVER_SENSE << 24 |
833 SAM_STAT_CHECK_CONDITION;
834 scsi_build_sense_buffer(1, sc->sense_buffer,
835 ILLEGAL_REQUEST, 0x10, ascq);
a73c2a2f
SG		 836 scsi_set_sense_information(sc->sense_buffer,
837 SCSI_SENSE_BUFFERSIZE,
838 sector);
55e51eda
SG		 839 goto out;
840 }
841 }
842
7996a778
MC		 843 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
844 sc->result = DID_ERROR << 16;
845 goto out;
846 }
847
848 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 849 uint16_t senselen;
7996a778
MC		 850
851 if (datalen < 2) {
852invalid_datalen:
322d739d
MC		 853 iscsi_conn_printk(KERN_ERR, conn,
854 "Got CHECK_CONDITION but invalid data "
855 "buffer size of %d\n", datalen);
7996a778
MC		 856 sc->result = DID_BAD_TARGET << 16;
857 goto out;
858 }
859
8f333991 860 senselen = get_unaligned_be16(data);
7996a778
MC		 861 if (datalen < senselen)
862 goto invalid_datalen;
863
864 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 865 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
1b2c7af8
MC		 866 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
867 min_t(uint16_t, senselen,
868 SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 869 }
870
c07d4444
BH		 871 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
872 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
ae3d56d8 873 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444
BH		 874 }
875
7207fea4
BH		 876 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
877 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 878 int res_count = be32_to_cpu(rhdr->residual_count);
879
7207fea4
BH		 880 if (res_count > 0 &&
881 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
882 res_count <= scsi_bufflen(sc)))
c07d4444 883 /* write side for bidi or uni-io set_resid */
1c138991 884 scsi_set_resid(sc, res_count);
7996a778
MC		 885 else
886 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 887 }
7996a778 888out:
3bbaaad9 889 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
1b2c7af8 890 sc, sc->result, task->itt);
7996a778 891 conn->scsirsp_pdus_cnt++;
b3cd5050 892 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 893}
894
1d9edf02
MC		 895/**
896 * iscsi_data_in_rsp - SCSI Data-In Response processing
897 * @conn: iscsi connection
898 * @hdr: iscsi pdu
899 * @task: scsi command task
a656183e
LD		 900 *
901 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received
902 * then completes the command and task. called under back_lock
1d9edf02
MC		 903 **/
904static void
905iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
906 struct iscsi_task *task)
907{
908 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
909 struct scsi_cmnd *sc = task->sc;
910
911 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
912 return;
913
edbc9aa0 914 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
1d9edf02
MC		 915 sc->result = (DID_OK << 16) | rhdr->cmd_status;
916 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
917 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
918 ISCSI_FLAG_DATA_OVERFLOW)) {
919 int res_count = be32_to_cpu(rhdr->residual_count);
920
921 if (res_count > 0 &&
922 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
ae3d56d8 923 res_count <= sc->sdb.length))
960bf87a 924 scsi_set_resid(sc, res_count);
1d9edf02
MC		 925 else
926 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
927 }
928
3bbaaad9
MC		 929 ISCSI_DBG_SESSION(conn->session, "data in with status done "
930 "[sc %p res %d itt 0x%x]\n",
931 sc, sc->result, task->itt);
1d9edf02 932 conn->scsirsp_pdus_cnt++;
b3cd5050 933 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1d9edf02
MC		 934}
935
7ea8b828
MC		 936static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
937{
938 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
939
940 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
941 conn->tmfrsp_pdus_cnt++;
942
843c0a8a 943 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 944 return;
945
946 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 947 conn->tmf_state = TMF_SUCCESS;
7ea8b828 948 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 949 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 950 else
843c0a8a 951 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 952 wake_up(&conn->ehwait);
953}
954
52f5664a 955static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
f6d5180c
MC		 956{
957 struct iscsi_nopout hdr;
9c19a7d0 958 struct iscsi_task *task;
f6d5180c 959
fe0a8a95
LD		 960 if (!rhdr) {
961 if (READ_ONCE(conn->ping_task))
962 return -EINVAL;
963 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK);
964 }
f6d5180c
MC		 965
966 memset(&hdr, 0, sizeof(struct iscsi_nopout));
967 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
968 hdr.flags = ISCSI_FLAG_CMD_FINAL;
969
970 if (rhdr) {
55bdabdf 971 hdr.lun = rhdr->lun;
f6d5180c
MC		 972 hdr.ttt = rhdr->ttt;
973 hdr.itt = RESERVED_ITT;
974 } else
975 hdr.ttt = RESERVED_ITT;
976
9c19a7d0 977 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
52f5664a 978 if (!task) {
fe0a8a95
LD		 979 if (!rhdr)
980 WRITE_ONCE(conn->ping_task, NULL);
322d739d 981 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
52f5664a
AN		 982 return -EIO;
983 } else if (!rhdr) {
d3acf022 984 /* only track our nops */
d3acf022
MC		 985 conn->last_ping = jiffies;
986 }
52f5664a
AN		 987
988 return 0;
f6d5180c
MC		 989}
990
a656183e
LD		 991/**
992 * iscsi_nop_out_rsp - SCSI NOP Response processing
993 * @task: scsi command task
994 * @nop: the nop structure
995 * @data: where to put the data
996 * @datalen: length of data
997 *
998 * iscsi_nop_out_rsp handles nop response from use or
999 * from user space. called under back_lock
1000 **/
8afa1439
MC		 1001static int iscsi_nop_out_rsp(struct iscsi_task *task,
1002 struct iscsi_nopin *nop, char *data, int datalen)
1003{
1004 struct iscsi_conn *conn = task->conn;
1005 int rc = 0;
1006
fe0a8a95 1007 if (READ_ONCE(conn->ping_task) != task) {
8afa1439
MC		 1008 /*
1009 * If this is not in response to one of our
1010 * nops then it must be from userspace.
1011 */
1012 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1013 data, datalen))
1014 rc = ISCSI_ERR_CONN_FAILED;
1015 } else
1016 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1017 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1018 return rc;
1019}
1020
62f38300
MC		 1021static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1022 char *data, int datalen)
1023{
1024 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1025 struct iscsi_hdr rejected_pdu;
8afa1439 1026 int opcode, rc = 0;
62f38300
MC		 1027
1028 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1029
8afa1439
MC		 1030 if (ntoh24(reject->dlength) > datalen ||
1031 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1032 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1033 "pdu. Invalid data length (pdu dlength "
1034 "%u, datalen %d\n", ntoh24(reject->dlength),
1035 datalen);
1036 return ISCSI_ERR_PROTO;
1037 }
1038 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1039 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1040
1041 switch (reject->reason) {
1042 case ISCSI_REASON_DATA_DIGEST_ERROR:
1043 iscsi_conn_printk(KERN_ERR, conn,
1044 "pdu (op 0x%x itt 0x%x) rejected "
1045 "due to DataDigest error.\n",
e5dbbe27 1046 opcode, rejected_pdu.itt);
8afa1439
MC		 1047 break;
1048 case ISCSI_REASON_IMM_CMD_REJECT:
1049 iscsi_conn_printk(KERN_ERR, conn,
1050 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1051 "immediate commands.\n",
e5dbbe27 1052 opcode, rejected_pdu.itt);
8afa1439
MC		 1053 /*
1054 * We only send one TMF at a time so if the target could not
1055 * handle it, then it should get fixed (RFC mandates that
1056 * a target can handle one immediate TMF per conn).
1057 *
1058 * For nops-outs, we could have sent more than one if
1059 * the target is sending us lots of nop-ins
1060 */
1061 if (opcode != ISCSI_OP_NOOP_OUT)
1062 return 0;
62f38300 1063
4dec6a8f 1064 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
8afa1439
MC		 1065 /*
1066 * nop-out in response to target's nop-out rejected.
1067 * Just resend.
1068 */
659743b0
SP		 1069 /* In RX path we are under back lock */
1070 spin_unlock(&conn->session->back_lock);
1071 spin_lock(&conn->session->frwd_lock);
8afa1439
MC		 1072 iscsi_send_nopout(conn,
1073 (struct iscsi_nopin*)&rejected_pdu);
659743b0
SP		 1074 spin_unlock(&conn->session->frwd_lock);
1075 spin_lock(&conn->session->back_lock);
1076 } else {
8afa1439
MC		 1077 struct iscsi_task *task;
1078 /*
1079 * Our nop as ping got dropped. We know the target
1080 * and transport are ok so just clean up
1081 */
1082 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1083 if (!task) {
1084 iscsi_conn_printk(KERN_ERR, conn,
1085 "Invalid pdu reject. Could "
1086 "not lookup rejected task.\n");
1087 rc = ISCSI_ERR_BAD_ITT;
1088 } else
1089 rc = iscsi_nop_out_rsp(task,
1090 (struct iscsi_nopin*)&rejected_pdu,
1091 NULL, 0);
62f38300 1092 }
8afa1439
MC		 1093 break;
1094 default:
1095 iscsi_conn_printk(KERN_ERR, conn,
1096 "pdu (op 0x%x itt 0x%x) rejected. Reason "
e5dbbe27
VC		 1097 "code 0x%x\n", rejected_pdu.opcode,
1098 rejected_pdu.itt, reject->reason);
8afa1439 1099 break;
62f38300 1100 }
8afa1439 1101 return rc;
62f38300
MC		 1102}
1103
913e5bf4
MC		 1104/**
1105 * iscsi_itt_to_task - look up task by itt
1106 * @conn: iscsi connection
1107 * @itt: itt
1108 *
1109 * This should be used for mgmt tasks like login and nops, or if
1110 * the LDD's itt space does not include the session age.
1111 *
659743b0 1112 * The session back_lock must be held.
913e5bf4 1113 */
8f9256ce 1114struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
913e5bf4
MC		 1115{
1116 struct iscsi_session *session = conn->session;
262ef636 1117 int i;
913e5bf4
MC		 1118
1119 if (itt == RESERVED_ITT)
1120 return NULL;
1121
262ef636
MC		 1122 if (session->tt->parse_pdu_itt)
1123 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1124 else
1125 i = get_itt(itt);
913e5bf4
MC		 1126 if (i >= session->cmds_max)
1127 return NULL;
1128
1129 return session->cmds[i];
1130}
8f9256ce 1131EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
913e5bf4 1132
7996a778
MC		 1133/**
1134 * __iscsi_complete_pdu - complete pdu
1135 * @conn: iscsi conn
1136 * @hdr: iscsi header
1137 * @data: data buffer
1138 * @datalen: len of data buffer
1139 *
1140 * Completes pdu processing by freeing any resources allocated at
659743b0 1141 * queuecommand or send generic. session back_lock must be held and verify
7996a778
MC		 1142 * itt must have been called.
1143 */
913e5bf4
MC		 1144int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1145 char *data, int datalen)
7996a778
MC		 1146{
1147 struct iscsi_session *session = conn->session;
1148 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 1149 struct iscsi_task *task;
7996a778
MC		 1150 uint32_t itt;
1151
f6d5180c 1152 conn->last_recv = jiffies;
0af967f5
MC		 1153 rc = iscsi_verify_itt(conn, hdr->itt);
1154 if (rc)
1155 return rc;
1156
b4377356
AV		 1157 if (hdr->itt != RESERVED_ITT)
1158 itt = get_itt(hdr->itt);
7996a778 1159 else
b4377356 1160 itt = ~0U;
7996a778 1161
1b2c7af8
MC		 1162 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1163 opcode, conn->id, itt, datalen);
7996a778 1164
3e5c28ad 1165 if (itt == ~0U) {
77a23c21 1166 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 1167
7996a778
MC		 1168 switch(opcode) {
1169 case ISCSI_OP_NOOP_IN:
40527afe 1170 if (datalen) {
7996a778 1171 rc = ISCSI_ERR_PROTO;
40527afe
MC		 1172 break;
1173 }
1174
b4377356 1175 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 1176 break;
1177
659743b0
SP		 1178 /* In RX path we are under back lock */
1179 spin_unlock(&session->back_lock);
1180 spin_lock(&session->frwd_lock);
f6d5180c 1181 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
659743b0
SP		 1182 spin_unlock(&session->frwd_lock);
1183 spin_lock(&session->back_lock);
7996a778
MC		 1184 break;
1185 case ISCSI_OP_REJECT:
62f38300
MC		 1186 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1187 break;
7996a778 1188 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 1189 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 1190 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1191 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 1192 break;
1193 default:
1194 rc = ISCSI_ERR_BAD_OPCODE;
1195 break;
1196 }
3e5c28ad
MC		 1197 goto out;
1198 }
1199
3e5c28ad
MC		 1200 switch(opcode) {
1201 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 1202 case ISCSI_OP_SCSI_DATA_IN:
1203 task = iscsi_itt_to_ctask(conn, hdr->itt);
1204 if (!task)
1205 return ISCSI_ERR_BAD_ITT;
d355e57d 1206 task->last_xfer = jiffies;
913e5bf4
MC		 1207 break;
1208 case ISCSI_OP_R2T:
1209 /*
1210 * LLD handles R2Ts if they need to.
1211 */
1212 return 0;
1213 case ISCSI_OP_LOGOUT_RSP:
1214 case ISCSI_OP_LOGIN_RSP:
1215 case ISCSI_OP_TEXT_RSP:
1216 case ISCSI_OP_SCSI_TMFUNC_RSP:
1217 case ISCSI_OP_NOOP_IN:
1218 task = iscsi_itt_to_task(conn, hdr->itt);
1219 if (!task)
1220 return ISCSI_ERR_BAD_ITT;
1221 break;
1222 default:
1223 return ISCSI_ERR_BAD_OPCODE;
1224 }
1225
1226 switch(opcode) {
1227 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 1228 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 1229 break;
1230 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 1231 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 1232 break;
3e5c28ad
MC		 1233 case ISCSI_OP_LOGOUT_RSP:
1234 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1235 if (datalen) {
1236 rc = ISCSI_ERR_PROTO;
1237 break;
1238 }
1239 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1240 goto recv_pdu;
1241 case ISCSI_OP_LOGIN_RSP:
1242 case ISCSI_OP_TEXT_RSP:
1243 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1244 /*
1245 * login related PDU's exp_statsn is handled in
1246 * userspace
1247 */
1248 goto recv_pdu;
1249 case ISCSI_OP_SCSI_TMFUNC_RSP:
1250 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1251 if (datalen) {
1252 rc = ISCSI_ERR_PROTO;
1253 break;
1254 }
1255
1256 iscsi_tmf_rsp(conn, hdr);
b3cd5050 1257 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
3e5c28ad
MC		 1258 break;
1259 case ISCSI_OP_NOOP_IN:
1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1261 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1262 rc = ISCSI_ERR_PROTO;
1263 break;
1264 }
1265 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1266
8afa1439
MC		 1267 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1268 data, datalen);
3e5c28ad
MC		 1269 break;
1270 default:
1271 rc = ISCSI_ERR_BAD_OPCODE;
1272 break;
1273 }
7996a778 1274
3e5c28ad
MC		 1275out:
1276 return rc;
1277recv_pdu:
1278 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1279 rc = ISCSI_ERR_CONN_FAILED;
b3cd5050 1280 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1281 return rc;
1282}
913e5bf4 1283EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 1284
1285int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1286 char *data, int datalen)
1287{
1288 int rc;
1289
659743b0 1290 spin_lock(&conn->session->back_lock);
7996a778 1291 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
659743b0 1292 spin_unlock(&conn->session->back_lock);
7996a778
MC		 1293 return rc;
1294}
1295EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1296
0af967f5 1297int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 1298{
1299 struct iscsi_session *session = conn->session;
262ef636 1300 int age = 0, i = 0;
7996a778 1301
0af967f5
MC		 1302 if (itt == RESERVED_ITT)
1303 return 0;
7996a778 1304
262ef636
MC		 1305 if (session->tt->parse_pdu_itt)
1306 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1307 else {
1308 i = get_itt(itt);
1309 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1310 }
1311
1312 if (age != session->age) {
0af967f5
MC		 1313 iscsi_conn_printk(KERN_ERR, conn,
1314 "received itt %x expected session age (%x)\n",
913e5bf4 1315 (__force u32)itt, session->age);
0af967f5
MC		 1316 return ISCSI_ERR_BAD_ITT;
1317 }
7996a778 1318
3e5c28ad
MC		 1319 if (i >= session->cmds_max) {
1320 iscsi_conn_printk(KERN_ERR, conn,
1321 "received invalid itt index %u (max cmds "
1322 "%u.\n", i, session->cmds_max);
1323 return ISCSI_ERR_BAD_ITT;
7996a778 1324 }
7996a778
MC		 1325 return 0;
1326}
1327EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1328
913e5bf4
MC		 1329/**
1330 * iscsi_itt_to_ctask - look up ctask by itt
1331 * @conn: iscsi connection
1332 * @itt: itt
1333 *
1334 * This should be used for cmd tasks.
1335 *
659743b0 1336 * The session back_lock must be held.
913e5bf4
MC		 1337 */
1338struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 1339{
9c19a7d0 1340 struct iscsi_task *task;
0af967f5
MC		 1341
1342 if (iscsi_verify_itt(conn, itt))
1343 return NULL;
1344
913e5bf4
MC		 1345 task = iscsi_itt_to_task(conn, itt);
1346 if (!task || !task->sc)
0af967f5
MC		 1347 return NULL;
1348
913e5bf4
MC		 1349 if (task->sc->SCp.phase != conn->session->age) {
1350 iscsi_session_printk(KERN_ERR, conn->session,
1351 "task's session age %d, expected %d\n",
1352 task->sc->SCp.phase, conn->session->age);
0af967f5 1353 return NULL;
913e5bf4 1354 }
0af967f5 1355
9c19a7d0 1356 return task;
0af967f5
MC		 1357}
1358EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1359
40a06e75 1360void iscsi_session_failure(struct iscsi_session *session,
e5bd7b54
MC		 1361 enum iscsi_err err)
1362{
e5bd7b54
MC		 1363 struct iscsi_conn *conn;
1364 struct device *dev;
e5bd7b54 1365
659743b0 1366 spin_lock_bh(&session->frwd_lock);
e5bd7b54
MC		 1367 conn = session->leadconn;
1368 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
659743b0 1369 spin_unlock_bh(&session->frwd_lock);
e5bd7b54
MC		 1370 return;
1371 }
1372
1373 dev = get_device(&conn->cls_conn->dev);
659743b0 1374 spin_unlock_bh(&session->frwd_lock);
e5bd7b54
MC		 1375 if (!dev)
1376 return;
1377 /*
1378 * if the host is being removed bypass the connection
1379 * recovery initialization because we are going to kill
1380 * the session.
1381 */
1382 if (err == ISCSI_ERR_INVALID_HOST)
1383 iscsi_conn_error_event(conn->cls_conn, err);
1384 else
1385 iscsi_conn_failure(conn, err);
1386 put_device(dev);
1387}
1388EXPORT_SYMBOL_GPL(iscsi_session_failure);
1389
7996a778
MC		 1390void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1391{
1392 struct iscsi_session *session = conn->session;
7996a778 1393
659743b0 1394 spin_lock_bh(&session->frwd_lock);
656cffc9 1395 if (session->state == ISCSI_STATE_FAILED) {
659743b0 1396 spin_unlock_bh(&session->frwd_lock);
656cffc9
MC		 1397 return;
1398 }
1399
67a61114 1400 if (conn->stop_stage == 0)
7996a778 1401 session->state = ISCSI_STATE_FAILED;
659743b0 1402 spin_unlock_bh(&session->frwd_lock);
e5bd7b54 1403
7996a778
MC		 1404 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1405 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1406 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1407}
1408EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1409
77a23c21
MC		 1410static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1411{
1412 struct iscsi_session *session = conn->session;
1413
1414 /*
1415 * Check for iSCSI window and take care of CmdSN wrap-around
1416 */
e0726407 1417 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1b2c7af8
MC		 1418 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1419 "%u MaxCmdSN %u CmdSN %u/%u\n",
1420 session->exp_cmdsn, session->max_cmdsn,
1421 session->cmdsn, session->queued_cmdsn);
77a23c21
MC		 1422 return -ENOSPC;
1423 }
1424 return 0;
1425}
1426
5923d64b
MC		 1427static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task,
1428 bool was_requeue)
77a23c21 1429{
843c0a8a 1430 int rc;
77a23c21 1431
79edd00d 1432 spin_lock_bh(&conn->session->back_lock);
5923d64b
MC		 1433
1434 if (!conn->task) {
1435 /* Take a ref so we can access it after xmit_task() */
1436 __iscsi_get_task(task);
1437 } else {
1438 /* Already have a ref from when we failed to send it last call */
1439 conn->task = NULL;
1440 }
1441
1442 /*
1443 * If this was a requeue for a R2T we have an extra ref on the task in
1444 * case a bad target sends a cmd rsp before we have handled the task.
1445 */
1446 if (was_requeue)
1447 __iscsi_put_task(task);
1448
1449 /*
1450 * Do this after dropping the extra ref because if this was a requeue
1451 * it's removed from that list and cleanup_queued_task would miss it.
1452 */
1453 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1454 /*
1455 * Save the task and ref in case we weren't cleaning up this
1456 * task and get woken up again.
1457 */
1458 conn->task = task;
79edd00d
AS		 1459 spin_unlock_bh(&conn->session->back_lock);
1460 return -ENODATA;
1461 }
79edd00d 1462 spin_unlock_bh(&conn->session->back_lock);
5923d64b 1463
659743b0 1464 spin_unlock_bh(&conn->session->frwd_lock);
9c19a7d0 1465 rc = conn->session->tt->xmit_task(task);
659743b0 1466 spin_lock_bh(&conn->session->frwd_lock);
d355e57d 1467 if (!rc) {
9c19a7d0 1468 /* done with this task */
d355e57d 1469 task->last_xfer = jiffies;
d355e57d 1470 }
659743b0 1471 /* regular RX path uses back_lock */
72b97402 1472 spin_lock(&conn->session->back_lock);
5923d64b
MC		 1473 if (rc && task->state == ISCSI_TASK_RUNNING) {
1474 /*
1475 * get an extra ref that is released next time we access it
1476 * as conn->task above.
1477 */
1478 __iscsi_get_task(task);
1479 conn->task = task;
1480 }
1481
d355e57d 1482 __iscsi_put_task(task);
72b97402 1483 spin_unlock(&conn->session->back_lock);
77a23c21
MC		 1484 return rc;
1485}
1486
843c0a8a 1487/**
9c19a7d0
MC		 1488 * iscsi_requeue_task - requeue task to run from session workqueue
1489 * @task: task to requeue
843c0a8a 1490 *
5923d64b 1491 * Callers must have taken a ref to the task that is going to be requeued.
843c0a8a 1492 */
9c19a7d0 1493void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1494{
9c19a7d0 1495 struct iscsi_conn *conn = task->conn;
843c0a8a 1496
3bbaaad9
MC		 1497 /*
1498 * this may be on the requeue list already if the xmit_task callout
1499 * is handling the r2ts while we are adding new ones
1500 */
5923d64b
MC		 1501 spin_lock_bh(&conn->session->frwd_lock);
1502 if (list_empty(&task->running)) {
3bbaaad9 1503 list_add_tail(&task->running, &conn->requeue);
5923d64b
MC		 1504 } else {
1505 /*
1506 * Don't need the extra ref since it's already requeued and
1507 * has a ref.
1508 */
1509 iscsi_put_task(task);
1510 }
32ae763e 1511 iscsi_conn_queue_work(conn);
5923d64b 1512 spin_unlock_bh(&conn->session->frwd_lock);
843c0a8a 1513}
9c19a7d0 1514EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1515
7996a778
MC		 1516/**
1517 * iscsi_data_xmit - xmit any command into the scheduled connection
1518 * @conn: iscsi connection
1519 *
1520 * Notes:
1521 * The function can return -EAGAIN in which case the caller must
1522 * re-schedule it again later or recover. '0' return code means
1523 * successful xmit.
1524 **/
1525static int iscsi_data_xmit(struct iscsi_conn *conn)
1526{
5d12c05e 1527 struct iscsi_task *task;
3219e529 1528 int rc = 0;
7996a778 1529
659743b0 1530 spin_lock_bh(&conn->session->frwd_lock);
70b31c15 1531 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1b2c7af8 1532 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
659743b0 1533 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1534 return -ENODATA;
7996a778 1535 }
7996a778 1536
9c19a7d0 1537 if (conn->task) {
5923d64b 1538 rc = iscsi_xmit_task(conn, conn->task, false);
3219e529 1539 if (rc)
70b31c15 1540 goto done;
7996a778
MC		 1541 }
1542
77a23c21
MC		 1543 /*
1544 * process mgmt pdus like nops before commands since we should
1545 * only have one nop-out as a ping from us and targets should not
1546 * overflow us with nop-ins
1547 */
1548check_mgmt:
843c0a8a 1549 while (!list_empty(&conn->mgmtqueue)) {
5923d64b
MC		 1550 task = list_entry(conn->mgmtqueue.next, struct iscsi_task,
1551 running);
1552 list_del_init(&task->running);
1553 if (iscsi_prep_mgmt_task(conn, task)) {
659743b0
SP		 1554 /* regular RX path uses back_lock */
1555 spin_lock_bh(&conn->session->back_lock);
5923d64b 1556 __iscsi_put_task(task);
659743b0 1557 spin_unlock_bh(&conn->session->back_lock);
b3a7ea8d
MC		 1558 continue;
1559 }
5923d64b 1560 rc = iscsi_xmit_task(conn, task, false);
77a23c21 1561 if (rc)
70b31c15 1562 goto done;
7996a778
MC		 1563 }
1564
843c0a8a 1565 /* process pending command queue */
3bbaaad9 1566 while (!list_empty(&conn->cmdqueue)) {
5923d64b
MC		 1567 task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1568 running);
1569 list_del_init(&task->running);
b3a7ea8d 1570 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
5923d64b 1571 fail_scsi_task(task, DID_IMM_RETRY);
b3a7ea8d
MC		 1572 continue;
1573 }
5923d64b 1574 rc = iscsi_prep_scsi_cmd_pdu(task);
577577da 1575 if (rc) {
d28d48c6 1576 if (rc == -ENOMEM || rc == -EACCES)
5923d64b 1577 fail_scsi_task(task, DID_IMM_RETRY);
d28d48c6 1578 else
5923d64b 1579 fail_scsi_task(task, DID_ABORT);
004d6530
BH		 1580 continue;
1581 }
5923d64b 1582 rc = iscsi_xmit_task(conn, task, false);
77a23c21 1583 if (rc)
70b31c15 1584 goto done;
77a23c21 1585 /*
9c19a7d0 1586 * we could continuously get new task requests so
77a23c21
MC		 1587 * we need to check the mgmt queue for nops that need to
1588 * be sent to aviod starvation
1589 */
843c0a8a
MC		 1590 if (!list_empty(&conn->mgmtqueue))
1591 goto check_mgmt;
1592 }
1593
1594 while (!list_empty(&conn->requeue)) {
b3a7ea8d
MC		 1595 /*
1596 * we always do fastlogout - conn stop code will clean up.
1597 */
1598 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1599 break;
1600
5d12c05e
MC		 1601 task = list_entry(conn->requeue.next, struct iscsi_task,
1602 running);
5923d64b 1603
5d12c05e
MC		 1604 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1605 break;
1606
5923d64b
MC		 1607 list_del_init(&task->running);
1608 rc = iscsi_xmit_task(conn, task, true);
843c0a8a 1609 if (rc)
70b31c15 1610 goto done;
843c0a8a 1611 if (!list_empty(&conn->mgmtqueue))
77a23c21 1612 goto check_mgmt;
7996a778 1613 }
659743b0 1614 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1615 return -ENODATA;
7996a778 1616
70b31c15 1617done:
659743b0 1618 spin_unlock_bh(&conn->session->frwd_lock);
3219e529 1619 return rc;
7996a778
MC		 1620}
1621
c4028958 1622static void iscsi_xmitworker(struct work_struct *work)
7996a778 1623{
c4028958
DH		 1624 struct iscsi_conn *conn =
1625 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1626 int rc;
7996a778
MC		 1627 /*
1628 * serialize Xmit worker on a per-connection basis.
1629 */
3219e529
MC		 1630 do {
1631 rc = iscsi_data_xmit(conn);
1632 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1633}
1634
577577da
MC		 1635static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1636 struct scsi_cmnd *sc)
1637{
1638 struct iscsi_task *task;
1639
7acd72eb 1640 if (!kfifo_out(&conn->session->cmdpool.queue,
577577da
MC		 1641 (void *) &task, sizeof(void *)))
1642 return NULL;
1643
1644 sc->SCp.phase = conn->session->age;
1645 sc->SCp.ptr = (char *) task;
1646
6dc618cd 1647 refcount_set(&task->refcount, 1);
577577da
MC		 1648 task->state = ISCSI_TASK_PENDING;
1649 task->conn = conn;
1650 task->sc = sc;
d355e57d
MC		 1651 task->have_checked_conn = false;
1652 task->last_timeout = jiffies;
1653 task->last_xfer = jiffies;
55e51eda 1654 task->protected = false;
577577da
MC		 1655 INIT_LIST_HEAD(&task->running);
1656 return task;
1657}
1658
7996a778
MC		 1659enum {
1660 FAILURE_BAD_HOST = 1,
1661 FAILURE_SESSION_FAILED,
1662 FAILURE_SESSION_FREED,
1663 FAILURE_WINDOW_CLOSED,
60ecebf5 1664 FAILURE_OOM,
7996a778 1665 FAILURE_SESSION_TERMINATE,
656cffc9 1666 FAILURE_SESSION_IN_RECOVERY,
7996a778 1667 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1668 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1669 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1670};
1671
f41d4721 1672int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
7996a778 1673{
75613521 1674 struct iscsi_cls_session *cls_session;
1336aed1 1675 struct iscsi_host *ihost;
7996a778
MC		 1676 int reason = 0;
1677 struct iscsi_session *session;
1678 struct iscsi_conn *conn;
9c19a7d0 1679 struct iscsi_task *task = NULL;
7996a778 1680
7996a778 1681 sc->result = 0;
f47f2cf5 1682 sc->SCp.ptr = NULL;
7996a778 1683
1336aed1 1684 ihost = shost_priv(host);
7996a778 1685
75613521
MC		 1686 cls_session = starget_to_session(scsi_target(sc->device));
1687 session = cls_session->dd_data;
659743b0 1688 spin_lock_bh(&session->frwd_lock);
7996a778 1689
75613521 1690 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1691 if (reason) {
1692 sc->result = reason;
1693 goto fault;
1694 }
1695
301e0f7e 1696 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9
MC		 1697 /*
1698 * to handle the race between when we set the recovery state
1699 * and block the session we requeue here (commands could
1700 * be entering our queuecommand while a block is starting
1701 * up because the block code is not locked)
1702 */
9000bcd6 1703 switch (session->state) {
301e0f7e 1704 case ISCSI_STATE_FAILED:
d7549412
RDT		 1705 /*
1706 * cmds should fail during shutdown, if the session
1707 * state is bad, allowing completion to happen
1708 */
1709 if (unlikely(system_state != SYSTEM_RUNNING)) {
1710 reason = FAILURE_SESSION_FAILED;
1711 sc->result = DID_NO_CONNECT << 16;
1712 break;
1713 }
df561f66 1714 fallthrough;
9000bcd6 1715 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1716 reason = FAILURE_SESSION_IN_RECOVERY;
301e0f7e
MC		 1717 sc->result = DID_IMM_RETRY << 16;
1718 break;
9000bcd6
MC		 1719 case ISCSI_STATE_LOGGING_OUT:
1720 reason = FAILURE_SESSION_LOGGING_OUT;
301e0f7e
MC		 1721 sc->result = DID_IMM_RETRY << 16;
1722 break;
b3a7ea8d 1723 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1724 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1725 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1726 break;
1727 case ISCSI_STATE_TERMINATE:
656cffc9 1728 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1729 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1730 break;
b3a7ea8d 1731 default:
656cffc9 1732 reason = FAILURE_SESSION_FREED;
6eabafbe 1733 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1734 }
7996a778
MC		 1735 goto fault;
1736 }
1737
7996a778 1738 conn = session->leadconn;
98644047
MC		 1739 if (!conn) {
1740 reason = FAILURE_SESSION_FREED;
6eabafbe 1741 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1742 goto fault;
1743 }
7996a778 1744
661134ad
MC		 1745 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1746 reason = FAILURE_SESSION_IN_RECOVERY;
eef9ffdf 1747 sc->result = DID_REQUEUE << 16;
661134ad
MC		 1748 goto fault;
1749 }
1750
77a23c21
MC		 1751 if (iscsi_check_cmdsn_window_closed(conn)) {
1752 reason = FAILURE_WINDOW_CLOSED;
1753 goto reject;
1754 }
1755
577577da
MC		 1756 task = iscsi_alloc_task(conn, sc);
1757 if (!task) {
60ecebf5
MC		 1758 reason = FAILURE_OOM;
1759 goto reject;
1760 }
7996a778 1761
1336aed1 1762 if (!ihost->workq) {
577577da
MC		 1763 reason = iscsi_prep_scsi_cmd_pdu(task);
1764 if (reason) {
5d12c05e 1765 if (reason == -ENOMEM || reason == -EACCES) {
577577da
MC		 1766 reason = FAILURE_OOM;
1767 goto prepd_reject;
1768 } else {
1769 sc->result = DID_ABORT << 16;
1770 goto prepd_fault;
1771 }
052d0144 1772 }
9c19a7d0 1773 if (session->tt->xmit_task(task)) {
d3305f34 1774 session->cmdsn--;
052d0144 1775 reason = FAILURE_SESSION_NOT_READY;
577577da 1776 goto prepd_reject;
052d0144 1777 }
3bbaaad9
MC		 1778 } else {
1779 list_add_tail(&task->running, &conn->cmdqueue);
32ae763e 1780 iscsi_conn_queue_work(conn);
3bbaaad9 1781 }
052d0144
MC		 1782
1783 session->queued_cmdsn++;
659743b0 1784 spin_unlock_bh(&session->frwd_lock);
7996a778
MC		 1785 return 0;
1786
577577da 1787prepd_reject:
a656183e 1788 spin_lock_bh(&session->back_lock);
f41d4721 1789 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
a656183e 1790 spin_unlock_bh(&session->back_lock);
7996a778 1791reject:
659743b0 1792 spin_unlock_bh(&session->frwd_lock);
1b2c7af8
MC		 1793 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1794 sc->cmnd[0], reason);
d6d13ee1 1795 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778 1796
577577da 1797prepd_fault:
a656183e 1798 spin_lock_bh(&session->back_lock);
f41d4721 1799 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
a656183e 1800 spin_unlock_bh(&session->back_lock);
7996a778 1801fault:
659743b0 1802 spin_unlock_bh(&session->frwd_lock);
1b2c7af8
MC		 1803 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1804 sc->cmnd[0], reason);
ae3d56d8 1805 scsi_set_resid(sc, scsi_bufflen(sc));
f41d4721 1806 sc->scsi_done(sc);
7996a778
MC		 1807 return 0;
1808}
1809EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1810
6b5d6c44
MC		 1811int iscsi_target_alloc(struct scsi_target *starget)
1812{
1813 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1814 struct iscsi_session *session = cls_session->dd_data;
1815
1816 starget->can_queue = session->scsi_cmds_max;
1817 return 0;
1818}
1819EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1820
2c4b9637 1821static void iscsi_tmf_timedout(struct timer_list *t)
7996a778 1822{
2c4b9637 1823 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer);
7996a778
MC		 1824 struct iscsi_session *session = conn->session;
1825
659743b0 1826 spin_lock(&session->frwd_lock);
843c0a8a
MC		 1827 if (conn->tmf_state == TMF_QUEUED) {
1828 conn->tmf_state = TMF_TIMEDOUT;
bd2199d4 1829 ISCSI_DBG_EH(session, "tmf timedout\n");
7996a778
MC		 1830 /* unblock eh_abort() */
1831 wake_up(&conn->ehwait);
1832 }
659743b0 1833 spin_unlock(&session->frwd_lock);
7996a778
MC		 1834}
1835
9c19a7d0 1836static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1837 struct iscsi_tm *hdr, int age,
1838 int timeout)
1360c58a 1839 __must_hold(&session->frwd_lock)
7996a778 1840{
7996a778 1841 struct iscsi_session *session = conn->session;
9c19a7d0 1842 struct iscsi_task *task;
7996a778 1843
9c19a7d0 1844 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1845 NULL, 0);
9c19a7d0 1846 if (!task) {
659743b0 1847 spin_unlock_bh(&session->frwd_lock);
df4da5cd 1848 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
7996a778 1849 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
659743b0 1850 spin_lock_bh(&session->frwd_lock);
77a23c21 1851 return -EPERM;
7996a778 1852 }
843c0a8a 1853 conn->tmfcmd_pdus_cnt++;
f6d5180c 1854 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a 1855 add_timer(&conn->tmf_timer);
bd2199d4 1856 ISCSI_DBG_EH(session, "tmf set timeout\n");
7996a778 1857
659743b0 1858 spin_unlock_bh(&session->frwd_lock);
6724add1 1859 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1860
1861 /*
1862 * block eh thread until:
1863 *
843c0a8a
MC		 1864 * 1) tmf response
1865 * 2) tmf timeout
7996a778
MC		 1866 * 3) session is terminated or restarted or userspace has
1867 * given up on recovery
1868 */
843c0a8a 1869 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1870 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1871 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1872 if (signal_pending(current))
1873 flush_signals(current);
843c0a8a
MC		 1874 del_timer_sync(&conn->tmf_timer);
1875
6724add1 1876 mutex_lock(&session->eh_mutex);
659743b0 1877 spin_lock_bh(&session->frwd_lock);
9c19a7d0 1878 /* if the session drops it will clean up the task */
843c0a8a
MC		 1879 if (age != session->age ||
1880 session->state != ISCSI_STATE_LOGGED_IN)
1881 return -ENOTCONN;
7996a778
MC		 1882 return 0;
1883}
1884
843c0a8a 1885/*
14936b1e 1886 * Fail commands. session frwd lock held and xmit thread flushed.
843c0a8a 1887 */
9cb78c16 1888static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
843c0a8a 1889{
14936b1e 1890 struct iscsi_session *session = conn->session;
3bbaaad9
MC		 1891 struct iscsi_task *task;
1892 int i;
843c0a8a 1893
14936b1e
MC		 1894 spin_lock_bh(&session->back_lock);
1895 for (i = 0; i < session->cmds_max; i++) {
1896 task = session->cmds[i];
3bbaaad9
MC		 1897 if (!task->sc || task->state == ISCSI_TASK_FREE)
1898 continue;
843c0a8a 1899
3bbaaad9
MC		 1900 if (lun != -1 && lun != task->sc->device->lun)
1901 continue;
843c0a8a 1902
14936b1e
MC		 1903 __iscsi_get_task(task);
1904 spin_unlock_bh(&session->back_lock);
1905
1906 ISCSI_DBG_SESSION(session,
3bbaaad9
MC		 1907 "failing sc %p itt 0x%x state %d\n",
1908 task->sc, task->itt, task->state);
b3cd5050 1909 fail_scsi_task(task, error);
14936b1e
MC		 1910
1911 spin_unlock_bh(&session->frwd_lock);
1912 iscsi_put_task(task);
1913 spin_lock_bh(&session->frwd_lock);
1914
1915 spin_lock_bh(&session->back_lock);
843c0a8a 1916 }
14936b1e
MC		 1917
1918 spin_unlock_bh(&session->back_lock);
843c0a8a
MC		 1919}
1920
661134ad
MC		 1921/**
1922 * iscsi_suspend_queue - suspend iscsi_queuecommand
1923 * @conn: iscsi conn to stop queueing IO on
1924 *
659743b0 1925 * This grabs the session frwd_lock to make sure no one is in
661134ad
MC		 1926 * xmit_task/queuecommand, and then sets suspend to prevent
1927 * new commands from being queued. This only needs to be called
1928 * by offload drivers that need to sync a path like ep disconnect
1929 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1930 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1931 */
1932void iscsi_suspend_queue(struct iscsi_conn *conn)
1933{
659743b0 1934 spin_lock_bh(&conn->session->frwd_lock);
661134ad 1935 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
659743b0 1936 spin_unlock_bh(&conn->session->frwd_lock);
661134ad
MC		 1937}
1938EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1939
1940/**
1941 * iscsi_suspend_tx - suspend iscsi_data_xmit
1942 * @conn: iscsi conn tp stop processing IO on.
1943 *
1944 * This function sets the suspend bit to prevent iscsi_data_xmit
1945 * from sending new IO, and if work is queued on the xmit thread
1946 * it will wait for it to be completed.
1947 */
b40977d9 1948void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1 1949{
32ae763e
MC		 1950 struct Scsi_Host *shost = conn->session->host;
1951 struct iscsi_host *ihost = shost_priv(shost);
1952
6724add1 1953 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1954 if (ihost->workq)
32ae763e 1955 flush_workqueue(ihost->workq);
6724add1 1956}
b40977d9 1957EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1958
1959static void iscsi_start_tx(struct iscsi_conn *conn)
1960{
1961 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1962 iscsi_conn_queue_work(conn);
6724add1
MC		 1963}
1964
4c48a829
MC		 1965/*
1966 * We want to make sure a ping is in flight. It has timed out.
1967 * And we are not busy processing a pdu that is making
1968 * progress but got started before the ping and is taking a while
1969 * to complete so the ping is just stuck behind it in a queue.
1970 */
1971static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1972{
fe0a8a95 1973 if (READ_ONCE(conn->ping_task) &&
4c48a829
MC		 1974 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1975 (conn->ping_timeout * HZ), jiffies))
1976 return 1;
1977 else
1978 return 0;
1979}
1980
b6a05c82 1981enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
f6d5180c 1982{
6600593c 1983 enum blk_eh_timer_return rc = BLK_EH_DONE;
92ed4d69 1984 struct iscsi_task *task = NULL, *running_task;
f6d5180c
MC		 1985 struct iscsi_cls_session *cls_session;
1986 struct iscsi_session *session;
1987 struct iscsi_conn *conn;
92ed4d69 1988 int i;
f6d5180c 1989
d355e57d 1990 cls_session = starget_to_session(scsi_target(sc->device));
75613521 1991 session = cls_session->dd_data;
f6d5180c 1992
bd2199d4 1993 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
f6d5180c 1994
5480e299 1995 spin_lock_bh(&session->frwd_lock);
14936b1e 1996 spin_lock(&session->back_lock);
e3d338a5
MC		 1997 task = (struct iscsi_task *)sc->SCp.ptr;
1998 if (!task) {
1999 /*
2000 * Raced with completion. Blk layer has taken ownership
2001 * so let timeout code complete it now.
2002 */
adb2b769 2003 rc = BLK_EH_DONE;
14936b1e 2004 spin_unlock(&session->back_lock);
e3d338a5
MC		 2005 goto done;
2006 }
14936b1e
MC		 2007 __iscsi_get_task(task);
2008 spin_unlock(&session->back_lock);
e3d338a5 2009
f6d5180c 2010 if (session->state != ISCSI_STATE_LOGGED_IN) {
d7549412
RDT		 2011 /*
2012 * During shutdown, if session is prematurely disconnected,
2013 * recovery won't happen and there will be hung cmds. Not
2014 * handling cmds would trigger EH, also bad in this case.
2015 * Instead, handle cmd, allow completion to happen and let
2016 * upper layer to deal with the result.
2017 */
2018 if (unlikely(system_state != SYSTEM_RUNNING)) {
2019 sc->result = DID_NO_CONNECT << 16;
2020 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
adb2b769 2021 rc = BLK_EH_DONE;
d7549412
RDT		 2022 goto done;
2023 }
f6d5180c
MC		 2024 /*
2025 * We are probably in the middle of iscsi recovery so let
2026 * that complete and handle the error.
2027 */
242f9dcb 2028 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 2029 goto done;
2030 }
2031
2032 conn = session->leadconn;
2033 if (!conn) {
2034 /* In the middle of shuting down */
242f9dcb 2035 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 2036 goto done;
2037 }
2038
d355e57d
MC		 2039 /*
2040 * If we have sent (at least queued to the network layer) a pdu or
2041 * recvd one for the task since the last timeout ask for
2042 * more time. If on the next timeout we have not made progress
2043 * we can check if it is the task or connection when we send the
2044 * nop as a ping.
2045 */
92ed4d69 2046 if (time_after(task->last_xfer, task->last_timeout)) {
bd2199d4
EZ		 2047 ISCSI_DBG_EH(session, "Command making progress. Asking "
2048 "scsi-ml for more time to complete. "
92ed4d69 2049 "Last data xfer at %lu. Last timeout was at "
bd2199d4 2050 "%lu\n.", task->last_xfer, task->last_timeout);
d355e57d
MC		 2051 task->have_checked_conn = false;
2052 rc = BLK_EH_RESET_TIMER;
2053 goto done;
2054 }
2055
f6d5180c
MC		 2056 if (!conn->recv_timeout && !conn->ping_timeout)
2057 goto done;
2058 /*
2059 * if the ping timedout then we are in the middle of cleaning up
2060 * and can let the iscsi eh handle it
2061 */
4c48a829 2062 if (iscsi_has_ping_timed_out(conn)) {
242f9dcb 2063 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2064 goto done;
2065 }
d355e57d 2066
14936b1e 2067 spin_lock(&session->back_lock);
92ed4d69
MC		 2068 for (i = 0; i < conn->session->cmds_max; i++) {
2069 running_task = conn->session->cmds[i];
2070 if (!running_task->sc || running_task == task ||
2071 running_task->state != ISCSI_TASK_RUNNING)
2072 continue;
2073
2074 /*
2075 * Only check if cmds started before this one have made
2076 * progress, or this could never fail
2077 */
2078 if (time_after(running_task->sc->jiffies_at_alloc,
2079 task->sc->jiffies_at_alloc))
2080 continue;
2081
2082 if (time_after(running_task->last_xfer, task->last_timeout)) {
2083 /*
2084 * This task has not made progress, but a task
2085 * started before us has transferred data since
2086 * we started/last-checked. We could be queueing
2087 * too many tasks or the LU is bad.
2088 *
2089 * If the device is bad the cmds ahead of us on
2090 * other devs will complete, and this loop will
2091 * eventually fail starting the scsi eh.
2092 */
2093 ISCSI_DBG_EH(session, "Command has not made progress "
2094 "but commands ahead of it have. "
2095 "Asking scsi-ml for more time to "
2096 "complete. Our last xfer vs running task "
2097 "last xfer %lu/%lu. Last check %lu.\n",
2098 task->last_xfer, running_task->last_xfer,
2099 task->last_timeout);
14936b1e 2100 spin_unlock(&session->back_lock);
92ed4d69
MC		 2101 rc = BLK_EH_RESET_TIMER;
2102 goto done;
2103 }
2104 }
14936b1e 2105 spin_unlock(&session->back_lock);
92ed4d69 2106
d355e57d
MC		 2107 /* Assumes nop timeout is shorter than scsi cmd timeout */
2108 if (task->have_checked_conn)
2109 goto done;
2110
f6d5180c 2111 /*
d355e57d
MC		 2112 * Checking the transport already or nop from a cmd timeout still
2113 * running
f6d5180c 2114 */
fe0a8a95 2115 if (READ_ONCE(conn->ping_task)) {
d355e57d 2116 task->have_checked_conn = true;
242f9dcb 2117 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2118 goto done;
2119 }
2120
d355e57d
MC		 2121 /* Make sure there is a transport check done */
2122 iscsi_send_nopout(conn, NULL);
2123 task->have_checked_conn = true;
2124 rc = BLK_EH_RESET_TIMER;
2125
f6d5180c 2126done:
5480e299 2127 spin_unlock_bh(&session->frwd_lock);
14936b1e
MC		 2128
2129 if (task) {
2130 task->last_timeout = jiffies;
2131 iscsi_put_task(task);
2132 }
bd2199d4 2133 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
d7549412 2134 "timer reset" : "shutdown or nh");
f6d5180c
MC		 2135 return rc;
2136}
b6a05c82 2137EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
f6d5180c 2138
2c4b9637 2139static void iscsi_check_transport_timeouts(struct timer_list *t)
f6d5180c 2140{
2c4b9637 2141 struct iscsi_conn *conn = from_timer(conn, t, transport_timer);
f6d5180c 2142 struct iscsi_session *session = conn->session;
4cf10435 2143 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c 2144
659743b0 2145 spin_lock(&session->frwd_lock);
f6d5180c
MC		 2146 if (session->state != ISCSI_STATE_LOGGED_IN)
2147 goto done;
2148
4cf10435
MC		 2149 recv_timeout = conn->recv_timeout;
2150 if (!recv_timeout)
f6d5180c
MC		 2151 goto done;
2152
4cf10435 2153 recv_timeout *= HZ;
f6d5180c 2154 last_recv = conn->last_recv;
4c48a829
MC		 2155
2156 if (iscsi_has_ping_timed_out(conn)) {
322d739d 2157 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
4c48a829
MC		 2158 "expired, recv timeout %d, last rx %lu, "
2159 "last ping %lu, now %lu\n",
2160 conn->ping_timeout, conn->recv_timeout,
2161 last_recv, conn->last_ping, jiffies);
659743b0 2162 spin_unlock(&session->frwd_lock);
09ff742c 2163 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
f6d5180c
MC		 2164 return;
2165 }
2166
4cf10435 2167 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97 2168 /* send a ping to try to provoke some traffic */
1b2c7af8 2169 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
52f5664a
AN		 2170 if (iscsi_send_nopout(conn, NULL))
2171 next_timeout = jiffies + (1 * HZ);
2172 else
2173 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 2174 } else
4cf10435 2175 next_timeout = last_recv + recv_timeout;
f6d5180c 2176
1b2c7af8 2177 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
ad294e9c 2178 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c 2179done:
659743b0 2180 spin_unlock(&session->frwd_lock);
f6d5180c
MC		 2181}
2182
9c19a7d0 2183static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 2184 struct iscsi_tm *hdr)
2185{
2186 memset(hdr, 0, sizeof(*hdr));
2187 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2188 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2189 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2190 hdr->lun = task->lun;
577577da
MC		 2191 hdr->rtt = task->hdr_itt;
2192 hdr->refcmdsn = task->cmdsn;
843c0a8a
MC		 2193}
2194
7996a778
MC		 2195int iscsi_eh_abort(struct scsi_cmnd *sc)
2196{
75613521
MC		 2197 struct iscsi_cls_session *cls_session;
2198 struct iscsi_session *session;
f47f2cf5 2199 struct iscsi_conn *conn;
9c19a7d0 2200 struct iscsi_task *task;
843c0a8a 2201 struct iscsi_tm *hdr;
e9e410e8 2202 int age;
7996a778 2203
75613521
MC		 2204 cls_session = starget_to_session(scsi_target(sc->device));
2205 session = cls_session->dd_data;
2206
bd2199d4 2207 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
4421c9eb 2208
6724add1 2209 mutex_lock(&session->eh_mutex);
659743b0 2210 spin_lock_bh(&session->frwd_lock);
f47f2cf5
MC		 2211 /*
2212 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2213 * got the command.
2214 */
2215 if (!sc->SCp.ptr) {
bd2199d4
EZ		 2216 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2217 "it completed.\n");
659743b0 2218 spin_unlock_bh(&session->frwd_lock);
6724add1 2219 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 2220 return SUCCESS;
2221 }
2222
7996a778
MC		 2223 /*
2224 * If we are not logged in or we have started a new session
2225 * then let the host reset code handle this
2226 */
843c0a8a
MC		 2227 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2228 sc->SCp.phase != session->age) {
659743b0 2229 spin_unlock_bh(&session->frwd_lock);
843c0a8a 2230 mutex_unlock(&session->eh_mutex);
bd2199d4 2231 ISCSI_DBG_EH(session, "failing abort due to dropped "
4421c9eb 2232 "session.\n");
843c0a8a
MC		 2233 return FAILED;
2234 }
2235
2236 conn = session->leadconn;
2237 conn->eh_abort_cnt++;
2238 age = session->age;
2239
14936b1e 2240 spin_lock(&session->back_lock);
9c19a7d0 2241 task = (struct iscsi_task *)sc->SCp.ptr;
14936b1e
MC		 2242 if (!task || !task->sc) {
2243 /* task completed before time out */
bd2199d4 2244 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
14936b1e
MC		 2245
2246 spin_unlock(&session->back_lock);
2247 spin_unlock_bh(&session->frwd_lock);
2248 mutex_unlock(&session->eh_mutex);
2249 return SUCCESS;
7ea8b828 2250 }
14936b1e
MC		 2251 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt);
2252 __iscsi_get_task(task);
2253 spin_unlock(&session->back_lock);
7996a778 2254
9c19a7d0 2255 if (task->state == ISCSI_TASK_PENDING) {
b3cd5050 2256 fail_scsi_task(task, DID_ABORT);
77a23c21
MC		 2257 goto success;
2258 }
7996a778 2259
843c0a8a
MC		 2260 /* only have one tmf outstanding at a time */
2261 if (conn->tmf_state != TMF_INITIAL)
7996a778 2262 goto failed;
843c0a8a 2263 conn->tmf_state = TMF_QUEUED;
7996a778 2264
843c0a8a 2265 hdr = &conn->tmhdr;
9c19a7d0 2266 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 2267
e9e410e8 2268 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
843c0a8a 2269 goto failed;
843c0a8a
MC		 2270
2271 switch (conn->tmf_state) {
2272 case TMF_SUCCESS:
659743b0 2273 spin_unlock_bh(&session->frwd_lock);
913e5bf4
MC		 2274 /*
2275 * stop tx side incase the target had sent a abort rsp but
2276 * the initiator was still writing out data.
2277 */
6724add1 2278 iscsi_suspend_tx(conn);
77a23c21 2279 /*
913e5bf4
MC		 2280 * we do not stop the recv side because targets have been
2281 * good and have never sent us a successful tmf response
2282 * then sent more data for the cmd.
77a23c21 2283 */
659743b0 2284 spin_lock_bh(&session->frwd_lock);
b3cd5050 2285 fail_scsi_task(task, DID_ABORT);
843c0a8a 2286 conn->tmf_state = TMF_INITIAL;
5d12c05e 2287 memset(hdr, 0, sizeof(*hdr));
659743b0 2288 spin_unlock_bh(&session->frwd_lock);
6724add1 2289 iscsi_start_tx(conn);
77a23c21 2290 goto success_unlocked;
843c0a8a 2291 case TMF_TIMEDOUT:
659743b0 2292 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2293 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2294 goto failed_unlocked;
2295 case TMF_NOT_FOUND:
2296 if (!sc->SCp.ptr) {
2297 conn->tmf_state = TMF_INITIAL;
5d12c05e 2298 memset(hdr, 0, sizeof(*hdr));
9c19a7d0 2299 /* task completed before tmf abort response */
bd2199d4
EZ		 2300 ISCSI_DBG_EH(session, "sc completed while abort in "
2301 "progress\n");
77a23c21 2302 goto success;
7ea8b828 2303 }
df561f66 2304 fallthrough;
7ea8b828 2305 default:
843c0a8a
MC		 2306 conn->tmf_state = TMF_INITIAL;
2307 goto failed;
7996a778
MC		 2308 }
2309
77a23c21 2310success:
659743b0 2311 spin_unlock_bh(&session->frwd_lock);
77a23c21 2312success_unlocked:
bd2199d4
EZ		 2313 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2314 sc, task->itt);
14936b1e 2315 iscsi_put_task(task);
6724add1 2316 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2317 return SUCCESS;
2318
2319failed:
659743b0 2320 spin_unlock_bh(&session->frwd_lock);
77a23c21 2321failed_unlocked:
bd2199d4
EZ		 2322 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2323 task ? task->itt : 0);
14936b1e 2324 iscsi_put_task(task);
6724add1 2325 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2326 return FAILED;
2327}
2328EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2329
843c0a8a
MC		 2330static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2331{
2332 memset(hdr, 0, sizeof(*hdr));
2333 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2334 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2335 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
55bdabdf 2336 int_to_scsilun(sc->device->lun, &hdr->lun);
f6d5180c 2337 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 2338}
2339
2340int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2341{
75613521
MC		 2342 struct iscsi_cls_session *cls_session;
2343 struct iscsi_session *session;
843c0a8a
MC		 2344 struct iscsi_conn *conn;
2345 struct iscsi_tm *hdr;
2346 int rc = FAILED;
2347
75613521
MC		 2348 cls_session = starget_to_session(scsi_target(sc->device));
2349 session = cls_session->dd_data;
2350
9cb78c16
HR		 2351 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2352 sc->device->lun);
843c0a8a
MC		 2353
2354 mutex_lock(&session->eh_mutex);
659743b0 2355 spin_lock_bh(&session->frwd_lock);
843c0a8a
MC		 2356 /*
2357 * Just check if we are not logged in. We cannot check for
2358 * the phase because the reset could come from a ioctl.
2359 */
2360 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2361 goto unlock;
2362 conn = session->leadconn;
2363
2364 /* only have one tmf outstanding at a time */
2365 if (conn->tmf_state != TMF_INITIAL)
2366 goto unlock;
2367 conn->tmf_state = TMF_QUEUED;
2368
2369 hdr = &conn->tmhdr;
2370 iscsi_prep_lun_reset_pdu(sc, hdr);
2371
9c19a7d0 2372 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 2373 session->lu_reset_timeout)) {
843c0a8a
MC		 2374 rc = FAILED;
2375 goto unlock;
2376 }
2377
2378 switch (conn->tmf_state) {
2379 case TMF_SUCCESS:
2380 break;
2381 case TMF_TIMEDOUT:
659743b0 2382 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2383 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2384 goto done;
2385 default:
2386 conn->tmf_state = TMF_INITIAL;
2387 goto unlock;
2388 }
2389
2390 rc = SUCCESS;
659743b0 2391 spin_unlock_bh(&session->frwd_lock);
843c0a8a
MC		 2392
2393 iscsi_suspend_tx(conn);
913e5bf4 2394
659743b0 2395 spin_lock_bh(&session->frwd_lock);
5d12c05e 2396 memset(hdr, 0, sizeof(*hdr));
3bbaaad9 2397 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
843c0a8a 2398 conn->tmf_state = TMF_INITIAL;
659743b0 2399 spin_unlock_bh(&session->frwd_lock);
843c0a8a
MC		 2400
2401 iscsi_start_tx(conn);
2402 goto done;
2403
2404unlock:
659743b0 2405 spin_unlock_bh(&session->frwd_lock);
843c0a8a 2406done:
bd2199d4
EZ		 2407 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2408 rc == SUCCESS ? "SUCCESS" : "FAILED");
843c0a8a
MC		 2409 mutex_unlock(&session->eh_mutex);
2410 return rc;
2411}
2412EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2413
3fe5ae8b
MC		 2414void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2415{
2416 struct iscsi_session *session = cls_session->dd_data;
2417
659743b0 2418 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2419 if (session->state != ISCSI_STATE_LOGGED_IN) {
2420 session->state = ISCSI_STATE_RECOVERY_FAILED;
2421 if (session->leadconn)
2422 wake_up(&session->leadconn->ehwait);
2423 }
659743b0 2424 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2425}
2426EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2427
2428/**
2429 * iscsi_eh_session_reset - drop session and attempt relogin
2430 * @sc: scsi command
2431 *
2432 * This function will wait for a relogin, session termination from
2433 * userspace, or a recovery/replacement timeout.
2434 */
309ce156 2435int iscsi_eh_session_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2436{
2437 struct iscsi_cls_session *cls_session;
2438 struct iscsi_session *session;
2439 struct iscsi_conn *conn;
2440
2441 cls_session = starget_to_session(scsi_target(sc->device));
2442 session = cls_session->dd_data;
2443 conn = session->leadconn;
2444
2445 mutex_lock(&session->eh_mutex);
659743b0 2446 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2447 if (session->state == ISCSI_STATE_TERMINATE) {
2448failed:
2449 ISCSI_DBG_EH(session,
2450 "failing session reset: Could not log back into "
5db6dd14
FH		 2451 "%s [age %d]\n", session->targetname,
2452 session->age);
659743b0 2453 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2454 mutex_unlock(&session->eh_mutex);
2455 return FAILED;
2456 }
2457
659743b0 2458 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2459 mutex_unlock(&session->eh_mutex);
2460 /*
2461 * we drop the lock here but the leadconn cannot be destoyed while
2462 * we are in the scsi eh
2463 */
df4da5cd 2464 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2465
2466 ISCSI_DBG_EH(session, "wait for relogin\n");
2467 wait_event_interruptible(conn->ehwait,
2468 session->state == ISCSI_STATE_TERMINATE ||
2469 session->state == ISCSI_STATE_LOGGED_IN ||
2470 session->state == ISCSI_STATE_RECOVERY_FAILED);
2471 if (signal_pending(current))
2472 flush_signals(current);
2473
2474 mutex_lock(&session->eh_mutex);
659743b0 2475 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2476 if (session->state == ISCSI_STATE_LOGGED_IN) {
2477 ISCSI_DBG_EH(session,
2478 "session reset succeeded for %s,%s\n",
2479 session->targetname, conn->persistent_address);
2480 } else
2481 goto failed;
659743b0 2482 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2483 mutex_unlock(&session->eh_mutex);
2484 return SUCCESS;
2485}
309ce156 2486EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
3fe5ae8b
MC		 2487
2488static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2489{
2490 memset(hdr, 0, sizeof(*hdr));
2491 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2492 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2493 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2494 hdr->rtt = RESERVED_ITT;
2495}
2496
2497/**
2498 * iscsi_eh_target_reset - reset target
2499 * @sc: scsi command
2500 *
309ce156 2501 * This will attempt to send a warm target reset.
3fe5ae8b 2502 */
3907adf6 2503static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2504{
2505 struct iscsi_cls_session *cls_session;
2506 struct iscsi_session *session;
2507 struct iscsi_conn *conn;
2508 struct iscsi_tm *hdr;
2509 int rc = FAILED;
2510
2511 cls_session = starget_to_session(scsi_target(sc->device));
2512 session = cls_session->dd_data;
2513
2514 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2515 session->targetname);
2516
2517 mutex_lock(&session->eh_mutex);
659743b0 2518 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2519 /*
2520 * Just check if we are not logged in. We cannot check for
2521 * the phase because the reset could come from a ioctl.
2522 */
2523 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2524 goto unlock;
2525 conn = session->leadconn;
2526
2527 /* only have one tmf outstanding at a time */
2528 if (conn->tmf_state != TMF_INITIAL)
2529 goto unlock;
2530 conn->tmf_state = TMF_QUEUED;
2531
2532 hdr = &conn->tmhdr;
2533 iscsi_prep_tgt_reset_pdu(sc, hdr);
2534
2535 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2536 session->tgt_reset_timeout)) {
2537 rc = FAILED;
2538 goto unlock;
2539 }
2540
2541 switch (conn->tmf_state) {
2542 case TMF_SUCCESS:
2543 break;
2544 case TMF_TIMEDOUT:
659743b0 2545 spin_unlock_bh(&session->frwd_lock);
df4da5cd 2546 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2547 goto done;
2548 default:
2549 conn->tmf_state = TMF_INITIAL;
2550 goto unlock;
2551 }
2552
2553 rc = SUCCESS;
659743b0 2554 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2555
2556 iscsi_suspend_tx(conn);
2557
659743b0 2558 spin_lock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2559 memset(hdr, 0, sizeof(*hdr));
2560 fail_scsi_tasks(conn, -1, DID_ERROR);
2561 conn->tmf_state = TMF_INITIAL;
659743b0 2562 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2563
2564 iscsi_start_tx(conn);
2565 goto done;
2566
2567unlock:
659743b0 2568 spin_unlock_bh(&session->frwd_lock);
3fe5ae8b
MC		 2569done:
2570 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2571 rc == SUCCESS ? "SUCCESS" : "FAILED");
2572 mutex_unlock(&session->eh_mutex);
309ce156
JK		 2573 return rc;
2574}
3fe5ae8b 2575
309ce156
JK		 2576/**
2577 * iscsi_eh_recover_target - reset target and possibly the session
2578 * @sc: scsi command
2579 *
2580 * This will attempt to send a warm target reset. If that fails,
2581 * we will escalate to ERL0 session recovery.
2582 */
2583int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2584{
2585 int rc;
2586
2587 rc = iscsi_eh_target_reset(sc);
3fe5ae8b
MC		 2588 if (rc == FAILED)
2589 rc = iscsi_eh_session_reset(sc);
2590 return rc;
2591}
309ce156 2592EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
3fe5ae8b 2593
6320377f
OK		 2594/*
2595 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2596 * should be accessed via kfifo_{get,put} on q->queue.
2597 * Optionally, the caller can obtain the array of object pointers
2598 * by passing in a non-NULL @items pointer
2599 */
7996a778 2600int
6320377f 2601iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 2602{
6320377f 2603 int i, num_arrays = 1;
7996a778 2604
6320377f 2605 memset(q, 0, sizeof(*q));
7996a778
MC		 2606
2607 q->max = max;
6320377f
OK		 2608
2609 /* If the user passed an items pointer, he wants a copy of
2610 * the array. */
2611 if (items)
2612 num_arrays++;
778e1cdd 2613 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
6320377f 2614 if (q->pool == NULL)
f474a37b 2615 return -ENOMEM;
7996a778 2616
c1e13f25 2617 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
7996a778
MC		 2618
2619 for (i = 0; i < max; i++) {
6320377f 2620 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 2621 if (q->pool[i] == NULL) {
6320377f
OK		 2622 q->max = i;
2623 goto enomem;
7996a778 2624 }
7acd72eb 2625 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
7996a778 2626 }
6320377f
OK		 2627
2628 if (items) {
2629 *items = q->pool + max;
2630 memcpy(*items, q->pool, max * sizeof(void *));
2631 }
2632
7996a778 2633 return 0;
6320377f
OK		 2634
2635enomem:
2636 iscsi_pool_free(q);
2637 return -ENOMEM;
7996a778
MC		 2638}
2639EXPORT_SYMBOL_GPL(iscsi_pool_init);
2640
6320377f 2641void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 2642{
2643 int i;
2644
2645 for (i = 0; i < q->max; i++)
6320377f 2646 kfree(q->pool[i]);
bfcc62ed 2647 kvfree(q->pool);
7996a778
MC		 2648}
2649EXPORT_SYMBOL_GPL(iscsi_pool_free);
2650
b4046922
MC		 2651int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost,
2652 uint16_t requested_cmds_max)
2653{
2654 int scsi_cmds, total_cmds = requested_cmds_max;
2655
2656check:
2657 if (!total_cmds)
2658 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2659 /*
2660 * The iscsi layer needs some tasks for nop handling and tmfs,
2661 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2662 * + 1 command for scsi IO.
2663 */
2664 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2665 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n",
2666 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2667 return -EINVAL;
2668 }
2669
2670 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2671 printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n",
2672 requested_cmds_max, ISCSI_TOTAL_CMDS_MAX,
2673 ISCSI_TOTAL_CMDS_MAX);
2674 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2675 }
2676
2677 if (!is_power_of_2(total_cmds)) {
2678 total_cmds = rounddown_pow_of_two(total_cmds);
2679 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2680 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n", requested_cmds_max, ISCSI_TOTAL_CMDS_MIN);
2681 return -EINVAL;
2682 }
2683
2684 printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n",
2685 requested_cmds_max, total_cmds);
2686 }
2687
2688 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2689 if (shost->can_queue && scsi_cmds > shost->can_queue) {
2690 total_cmds = shost->can_queue;
2691
2692 printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n",
2693 requested_cmds_max, shost->can_queue);
2694 goto check;
2695 }
2696
2697 return scsi_cmds;
2698}
2699EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds);
2700
a4804cd6
MC		 2701/**
2702 * iscsi_host_add - add host to system
2703 * @shost: scsi host
2704 * @pdev: parent device
2705 *
2706 * This should be called by partial offload and software iscsi drivers
2707 * to add a host to the system.
2708 */
2709int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2710{
8e9a20ce
MC		 2711 if (!shost->can_queue)
2712 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2713
4d108350
MC		 2714 if (!shost->cmd_per_lun)
2715 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2716
a4804cd6
MC		 2717 return scsi_add_host(shost, pdev);
2718}
2719EXPORT_SYMBOL_GPL(iscsi_host_add);
2720
2721/**
2722 * iscsi_host_alloc - allocate a host and driver data
2723 * @sht: scsi host template
2724 * @dd_data_size: driver host data size
32ae763e 2725 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
a4804cd6
MC		 2726 *
2727 * This should be called by partial offload and software iscsi drivers.
2728 * To access the driver specific memory use the iscsi_host_priv() macro.
2729 */
2730struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
4d108350 2731 int dd_data_size, bool xmit_can_sleep)
75613521 2732{
a4804cd6 2733 struct Scsi_Host *shost;
e5bd7b54 2734 struct iscsi_host *ihost;
a4804cd6
MC		 2735
2736 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2737 if (!shost)
2738 return NULL;
e5bd7b54 2739 ihost = shost_priv(shost);
32ae763e
MC		 2740
2741 if (xmit_can_sleep) {
2742 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2743 "iscsi_q_%d", shost->host_no);
3ce41966
BL		 2744 ihost->workq = alloc_workqueue("%s",
2745 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
1a982620 2746 1, ihost->workq_name);
32ae763e
MC		 2747 if (!ihost->workq)
2748 goto free_host;
2749 }
2750
e5bd7b54
MC		 2751 spin_lock_init(&ihost->lock);
2752 ihost->state = ISCSI_HOST_SETUP;
2753 ihost->num_sessions = 0;
2754 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6 2755 return shost;
32ae763e
MC		 2756
2757free_host:
2758 scsi_host_put(shost);
2759 return NULL;
a4804cd6
MC		 2760}
2761EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2762
e5bd7b54
MC		 2763static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2764{
40a06e75 2765 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
e5bd7b54
MC		 2766}
2767
a4804cd6
MC		 2768/**
2769 * iscsi_host_remove - remove host and sessions
2770 * @shost: scsi host
2771 *
e5bd7b54
MC		 2772 * If there are any sessions left, this will initiate the removal and wait
2773 * for the completion.
a4804cd6
MC		 2774 */
2775void iscsi_host_remove(struct Scsi_Host *shost)
2776{
e5bd7b54
MC		 2777 struct iscsi_host *ihost = shost_priv(shost);
2778 unsigned long flags;
2779
2780 spin_lock_irqsave(&ihost->lock, flags);
2781 ihost->state = ISCSI_HOST_REMOVED;
2782 spin_unlock_irqrestore(&ihost->lock, flags);
2783
2784 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2785 wait_event_interruptible(ihost->session_removal_wq,
2786 ihost->num_sessions == 0);
2787 if (signal_pending(current))
2788 flush_signals(current);
2789
a4804cd6 2790 scsi_remove_host(shost);
75613521 2791}
a4804cd6 2792EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 2793
a4804cd6 2794void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 2795{
2796 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2797
c435f0a9
MC		 2798 if (ihost->workq)
2799 destroy_workqueue(ihost->workq);
2800
75613521
MC		 2801 kfree(ihost->netdev);
2802 kfree(ihost->hwaddress);
2803 kfree(ihost->initiatorname);
a4804cd6 2804 scsi_host_put(shost);
75613521 2805}
a4804cd6 2806EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2807
e5bd7b54
MC		 2808static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2809{
2810 struct iscsi_host *ihost = shost_priv(shost);
2811 unsigned long flags;
2812
2813 shost = scsi_host_get(shost);
2814 if (!shost) {
2815 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2816 "of session teardown event because host already "
2817 "removed.\n");
2818 return;
2819 }
2820
2821 spin_lock_irqsave(&ihost->lock, flags);
2822 ihost->num_sessions--;
2823 if (ihost->num_sessions == 0)
2824 wake_up(&ihost->session_removal_wq);
2825 spin_unlock_irqrestore(&ihost->lock, flags);
2826 scsi_host_put(shost);
2827}
2828
7996a778
MC		 2829/**
2830 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2831 * @iscsit: iscsi transport template
75613521
MC		 2832 * @shost: scsi host
2833 * @cmds_max: session can queue
ccd4a430 2834 * @dd_size: private driver data size, added to session allocation size
9c19a7d0 2835 * @cmd_task_size: LLD task private data size
7996a778 2836 * @initial_cmdsn: initial CmdSN
ccd4a430 2837 * @id: target ID to add to this session
7996a778
MC		 2838 *
2839 * This can be used by software iscsi_transports that allocate
2840 * a session per scsi host.
3cf7b233
MC		 2841 *
2842 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2843 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2844 * for nop handling and login/logout requests.
75613521 2845 */
7996a778 2846struct iscsi_cls_session *
75613521 2847iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
b8b9e1b8 2848 uint16_t cmds_max, int dd_size, int cmd_task_size,
7970634b 2849 uint32_t initial_cmdsn, unsigned int id)
7996a778 2850{
e5bd7b54 2851 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2852 struct iscsi_session *session;
2853 struct iscsi_cls_session *cls_session;
b4046922 2854 int cmd_i, scsi_cmds;
e5bd7b54
MC		 2855 unsigned long flags;
2856
2857 spin_lock_irqsave(&ihost->lock, flags);
2858 if (ihost->state == ISCSI_HOST_REMOVED) {
2859 spin_unlock_irqrestore(&ihost->lock, flags);
2860 return NULL;
2861 }
2862 ihost->num_sessions++;
2863 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce 2864
b4046922
MC		 2865 scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
2866 if (scsi_cmds < 0)
e5bd7b54 2867 goto dec_session_count;
1548271e 2868
5d91e209 2869 cls_session = iscsi_alloc_session(shost, iscsit,
b8b9e1b8
JK		 2870 sizeof(struct iscsi_session) +
2871 dd_size);
75613521 2872 if (!cls_session)
e5bd7b54 2873 goto dec_session_count;
75613521
MC		 2874 session = cls_session->dd_data;
2875 session->cls_session = cls_session;
7996a778
MC		 2876 session->host = shost;
2877 session->state = ISCSI_STATE_FREE;
f6d5180c 2878 session->fast_abort = 1;
3fe5ae8b 2879 session->tgt_reset_timeout = 30;
4cd49ea1
MC		 2880 session->lu_reset_timeout = 15;
2881 session->abort_timeout = 10;
3cf7b233 2882 session->scsi_cmds_max = scsi_cmds;
b4046922 2883 session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX;
e0726407 2884 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2885 session->exp_cmdsn = initial_cmdsn + 1;
2886 session->max_cmdsn = initial_cmdsn + 1;
2887 session->max_r2t = 1;
2888 session->tt = iscsit;
b8b9e1b8 2889 session->dd_data = cls_session->dd_data + sizeof(*session);
659743b0 2890
6724add1 2891 mutex_init(&session->eh_mutex);
659743b0
SP		 2892 spin_lock_init(&session->frwd_lock);
2893 spin_lock_init(&session->back_lock);
7996a778
MC		 2894
2895 /* initialize SCSI PDU commands pool */
2896 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2897 (void***)&session->cmds,
9c19a7d0 2898 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2899 goto cmdpool_alloc_fail;
2900
2901 /* pre-format cmds pool with ITT */
2902 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2903 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2904
9c19a7d0
MC		 2905 if (cmd_task_size)
2906 task->dd_data = &task[1];
2907 task->itt = cmd_i;
3bbaaad9 2908 task->state = ISCSI_TASK_FREE;
9c19a7d0 2909 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2910 }
2911
f53a88da 2912 if (!try_module_get(iscsit->owner))
75613521 2913 goto module_get_fail;
7996a778 2914
7970634b 2915 if (iscsi_add_session(cls_session, id))
75613521 2916 goto cls_session_fail;
e5bd7b54 2917
7996a778
MC		 2918 return cls_session;
2919
2920cls_session_fail:
75613521
MC		 2921 module_put(iscsit->owner);
2922module_get_fail:
6320377f 2923 iscsi_pool_free(&session->cmdpool);
7996a778 2924cmdpool_alloc_fail:
75613521 2925 iscsi_free_session(cls_session);
e5bd7b54
MC		 2926dec_session_count:
2927 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2928 return NULL;
2929}
2930EXPORT_SYMBOL_GPL(iscsi_session_setup);
2931
2932/**
2933 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2934 * @cls_session: iscsi session
75613521 2935 */
7996a778
MC		 2936void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2937{
75613521 2938 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2939 struct module *owner = cls_session->transport->owner;
e5bd7b54 2940 struct Scsi_Host *shost = session->host;
7996a778 2941
6320377f 2942 iscsi_pool_free(&session->cmdpool);
7996a778 2943
9e10b512
KK		 2944 iscsi_remove_session(cls_session);
2945
b2c64167
MC		 2946 kfree(session->password);
2947 kfree(session->password_in);
2948 kfree(session->username);
2949 kfree(session->username_in);
f3ff0c36 2950 kfree(session->targetname);
3c5c4801 2951 kfree(session->targetalias);
88dfd340 2952 kfree(session->initiatorname);
3b9373e9
EW		 2953 kfree(session->boot_root);
2954 kfree(session->boot_nic);
2955 kfree(session->boot_target);
88dfd340 2956 kfree(session->ifacename);
f8525eb4
AC		 2957 kfree(session->portal_type);
2958 kfree(session->discovery_parent_type);
f3ff0c36 2959
9e10b512
KK		 2960 iscsi_free_session(cls_session);
2961
e5bd7b54 2962 iscsi_host_dec_session_cnt(shost);
63f75cc8 2963 module_put(owner);
7996a778
MC		 2964}
2965EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2966
2967/**
2968 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2969 * @cls_session: iscsi_cls_session
5d91e209 2970 * @dd_size: private driver data size
7996a778 2971 * @conn_idx: cid
5d91e209 2972 */
7996a778 2973struct iscsi_cls_conn *
5d91e209
MC		 2974iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2975 uint32_t conn_idx)
7996a778 2976{
75613521 2977 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2978 struct iscsi_conn *conn;
2979 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2980 char *data;
7996a778 2981
5d91e209
MC		 2982 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2983 conn_idx);
7996a778
MC		 2984 if (!cls_conn)
2985 return NULL;
2986 conn = cls_conn->dd_data;
5d91e209 2987 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2988
5d91e209 2989 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2990 conn->session = session;
2991 conn->cls_conn = cls_conn;
2992 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2993 conn->id = conn_idx;
2994 conn->exp_statsn = 0;
843c0a8a 2995 conn->tmf_state = TMF_INITIAL;
f6d5180c 2996
2c4b9637 2997 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
f6d5180c 2998
843c0a8a 2999 INIT_LIST_HEAD(&conn->mgmtqueue);
3bbaaad9 3000 INIT_LIST_HEAD(&conn->cmdqueue);
843c0a8a 3001 INIT_LIST_HEAD(&conn->requeue);
c4028958 3002 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 3003
9c19a7d0 3004 /* allocate login_task used for the login/text sequences */
659743b0 3005 spin_lock_bh(&session->frwd_lock);
7acd72eb 3006 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 3007 (void*)&conn->login_task,
7996a778 3008 sizeof(void*))) {
659743b0 3009 spin_unlock_bh(&session->frwd_lock);
9c19a7d0 3010 goto login_task_alloc_fail;
7996a778 3011 }
659743b0 3012 spin_unlock_bh(&session->frwd_lock);
7996a778 3013
cfeb2cf9
MC		 3014 data = (char *) __get_free_pages(GFP_KERNEL,
3015 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
d36ab6f3 3016 if (!data)
9c19a7d0
MC		 3017 goto login_task_data_alloc_fail;
3018 conn->login_task->data = conn->data = data;
d36ab6f3 3019
2c4b9637 3020 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0);
7996a778
MC		 3021 init_waitqueue_head(&conn->ehwait);
3022
3023 return cls_conn;
3024
9c19a7d0 3025login_task_data_alloc_fail:
7acd72eb 3026 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 3027 sizeof(void*));
9c19a7d0 3028login_task_alloc_fail:
7996a778
MC		 3029 iscsi_destroy_conn(cls_conn);
3030 return NULL;
3031}
3032EXPORT_SYMBOL_GPL(iscsi_conn_setup);
3033
3034/**
3035 * iscsi_conn_teardown - teardown iscsi connection
ccd4a430 3036 * @cls_conn: iscsi class connection
7996a778
MC		 3037 *
3038 * TODO: we may need to make this into a two step process
3039 * like scsi-mls remove + put host
3040 */
3041void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
3042{
3043 struct iscsi_conn *conn = cls_conn->dd_data;
3044 struct iscsi_session *session = conn->session;
7996a778 3045
f6d5180c
MC		 3046 del_timer_sync(&conn->transport_timer);
3047
660d0831 3048 mutex_lock(&session->eh_mutex);
659743b0 3049 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 3050 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
3051 if (session->leadconn == conn) {
3052 /*
3053 * leading connection? then give up on recovery.
3054 */
3055 session->state = ISCSI_STATE_TERMINATE;
3056 wake_up(&conn->ehwait);
3057 }
659743b0 3058 spin_unlock_bh(&session->frwd_lock);
7996a778 3059
779ea120 3060 /* flush queued up work because we free the connection below */
843c0a8a 3061 iscsi_suspend_tx(conn);
779ea120 3062
659743b0 3063 spin_lock_bh(&session->frwd_lock);
cfeb2cf9
MC		 3064 free_pages((unsigned long) conn->data,
3065 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
f3ff0c36 3066 kfree(conn->persistent_address);
ae56ff40 3067 kfree(conn->local_ipaddr);
659743b0
SP		 3068 /* regular RX path uses back_lock */
3069 spin_lock_bh(&session->back_lock);
7acd72eb 3070 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
7996a778 3071 sizeof(void*));
659743b0 3072 spin_unlock_bh(&session->back_lock);
e0726407 3073 if (session->leadconn == conn)
7996a778 3074 session->leadconn = NULL;
659743b0 3075 spin_unlock_bh(&session->frwd_lock);
660d0831 3076 mutex_unlock(&session->eh_mutex);
7996a778 3077
7996a778
MC		 3078 iscsi_destroy_conn(cls_conn);
3079}
3080EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3081
3082int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3083{
3084 struct iscsi_conn *conn = cls_conn->dd_data;
3085 struct iscsi_session *session = conn->session;
3086
ffd0436e 3087 if (!session) {
322d739d
MC		 3088 iscsi_conn_printk(KERN_ERR, conn,
3089 "can't start unbound connection\n");
7996a778
MC		 3090 return -EPERM;
3091 }
3092
db98ccde
MC		 3093 if ((session->imm_data_en || !session->initial_r2t_en) &&
3094 session->first_burst > session->max_burst) {
322d739d
MC		 3095 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3096 "first_burst %d max_burst %d\n",
3097 session->first_burst, session->max_burst);
ffd0436e
MC		 3098 return -EINVAL;
3099 }
3100
f6d5180c 3101 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 3102 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3103 "zero. Using 5 seconds\n.");
f6d5180c
MC		 3104 conn->recv_timeout = 5;
3105 }
3106
3107 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 3108 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3109 "zero. Using 5 seconds.\n");
f6d5180c
MC		 3110 conn->ping_timeout = 5;
3111 }
3112
659743b0 3113 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 3114 conn->c_stage = ISCSI_CONN_STARTED;
3115 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 3116 session->queued_cmdsn = session->cmdsn;
7996a778 3117
f6d5180c
MC		 3118 conn->last_recv = jiffies;
3119 conn->last_ping = jiffies;
3120 if (conn->recv_timeout && conn->ping_timeout)
3121 mod_timer(&conn->transport_timer,
3122 jiffies + (conn->recv_timeout * HZ));
3123
7996a778
MC		 3124 switch(conn->stop_stage) {
3125 case STOP_CONN_RECOVER:
3126 /*
3127 * unblock eh_abort() if it is blocked. re-try all
3128 * commands after successful recovery
3129 */
7996a778 3130 conn->stop_stage = 0;
843c0a8a 3131 conn->tmf_state = TMF_INITIAL;
7996a778 3132 session->age++;
8b1d0343
MC		 3133 if (session->age == 16)
3134 session->age = 0;
6eabafbe 3135 break;
7996a778 3136 case STOP_CONN_TERM:
7996a778 3137 conn->stop_stage = 0;
7996a778
MC		 3138 break;
3139 default:
3140 break;
3141 }
659743b0 3142 spin_unlock_bh(&session->frwd_lock);
7996a778 3143
75613521 3144 iscsi_unblock_session(session->cls_session);
6eabafbe 3145 wake_up(&conn->ehwait);
7996a778
MC		 3146 return 0;
3147}
3148EXPORT_SYMBOL_GPL(iscsi_conn_start);
3149
3150static void
3bbaaad9 3151fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
7996a778 3152{
3bbaaad9 3153 struct iscsi_task *task;
b3cd5050 3154 int i, state;
7996a778 3155
3bbaaad9
MC		 3156 for (i = 0; i < conn->session->cmds_max; i++) {
3157 task = conn->session->cmds[i];
3158 if (task->sc)
3159 continue;
7996a778 3160
3bbaaad9
MC		 3161 if (task->state == ISCSI_TASK_FREE)
3162 continue;
7996a778 3163
3bbaaad9
MC		 3164 ISCSI_DBG_SESSION(conn->session,
3165 "failing mgmt itt 0x%x state %d\n",
3166 task->itt, task->state);
5923d64b
MC		 3167
3168 spin_lock_bh(&session->back_lock);
3169 if (cleanup_queued_task(task)) {
3170 spin_unlock_bh(&session->back_lock);
3171 continue;
3172 }
3173
b3cd5050
MC		 3174 state = ISCSI_TASK_ABRT_SESS_RECOV;
3175 if (task->state == ISCSI_TASK_PENDING)
3176 state = ISCSI_TASK_COMPLETED;
3177 iscsi_complete_task(task, state);
a656183e 3178 spin_unlock_bh(&session->back_lock);
3bbaaad9 3179 }
7996a778
MC		 3180}
3181
0dcf8feb 3182void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
7996a778 3183{
0dcf8feb
MC		 3184 struct iscsi_conn *conn = cls_conn->dd_data;
3185 struct iscsi_session *session = conn->session;
ed2abc7f
MC		 3186 int old_stop_stage;
3187
6724add1 3188 mutex_lock(&session->eh_mutex);
659743b0 3189 spin_lock_bh(&session->frwd_lock);
ed2abc7f 3190 if (conn->stop_stage == STOP_CONN_TERM) {
659743b0 3191 spin_unlock_bh(&session->frwd_lock);
6724add1
MC		 3192 mutex_unlock(&session->eh_mutex);
3193 return;
3194 }
3195
ed2abc7f
MC		 3196 /*
3197 * When this is called for the in_login state, we only want to clean
9c19a7d0 3198 * up the login task and connection. We do not need to block and set
67a61114 3199 * the recovery state again
ed2abc7f 3200 */
67a61114
MC		 3201 if (flag == STOP_CONN_TERM)
3202 session->state = ISCSI_STATE_TERMINATE;
3203 else if (conn->stop_stage != STOP_CONN_RECOVER)
3204 session->state = ISCSI_STATE_IN_RECOVERY;
4ae0a6c1
MC		 3205
3206 old_stop_stage = conn->stop_stage;
3207 conn->stop_stage = flag;
659743b0 3208 spin_unlock_bh(&session->frwd_lock);
ed2abc7f 3209
26013ad4
MC		 3210 del_timer_sync(&conn->transport_timer);
3211 iscsi_suspend_tx(conn);
3212
659743b0 3213 spin_lock_bh(&session->frwd_lock);
67a61114 3214 conn->c_stage = ISCSI_CONN_STOPPED;
659743b0 3215 spin_unlock_bh(&session->frwd_lock);
6724add1 3216
7996a778
MC		 3217 /*
3218 * for connection level recovery we should not calculate
3219 * header digest. conn->hdr_size used for optimization
3220 * in hdr_extract() and will be re-negotiated at
3221 * set_param() time.
3222 */
3223 if (flag == STOP_CONN_RECOVER) {
3224 conn->hdrdgst_en = 0;
3225 conn->datadgst_en = 0;
656cffc9 3226 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114 3227 old_stop_stage != STOP_CONN_RECOVER) {
1b2c7af8 3228 ISCSI_DBG_SESSION(session, "blocking session\n");
75613521 3229 iscsi_block_session(session->cls_session);
67a61114 3230 }
7996a778 3231 }
656cffc9 3232
656cffc9
MC		 3233 /*
3234 * flush queues.
3235 */
659743b0 3236 spin_lock_bh(&session->frwd_lock);
b3cd5050 3237 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3bbaaad9 3238 fail_mgmt_tasks(session, conn);
5d12c05e 3239 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
659743b0 3240 spin_unlock_bh(&session->frwd_lock);
6724add1 3241 mutex_unlock(&session->eh_mutex);
7996a778 3242}
7996a778
MC		 3243EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3244
3245int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3246 struct iscsi_cls_conn *cls_conn, int is_leading)
3247{
75613521 3248 struct iscsi_session *session = cls_session->dd_data;
98644047 3249 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 3250
659743b0 3251 spin_lock_bh(&session->frwd_lock);
7996a778
MC		 3252 if (is_leading)
3253 session->leadconn = conn;
659743b0 3254 spin_unlock_bh(&session->frwd_lock);
7996a778 3255
c8447e4c
MC		 3256 /*
3257 * The target could have reduced it's window size between logins, so
3258 * we have to reset max/exp cmdsn so we can see the new values.
3259 */
3260 spin_lock_bh(&session->back_lock);
3261 session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1;
3262 spin_unlock_bh(&session->back_lock);
7996a778
MC		 3263 /*
3264 * Unblock xmitworker(), Login Phase will pass through.
3265 */
3266 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3267 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3268 return 0;
3269}
3270EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3271
adaf6990 3272int iscsi_switch_str_param(char **param, char *new_val_buf)
5700b1af
MC		 3273{
3274 char *new_val;
3275
3276 if (*param) {
3277 if (!strcmp(*param, new_val_buf))
3278 return 0;
3279 }
3280
3281 new_val = kstrdup(new_val_buf, GFP_NOIO);
3282 if (!new_val)
3283 return -ENOMEM;
3284
3285 kfree(*param);
3286 *param = new_val;
3287 return 0;
3288}
adaf6990 3289EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
a54a52ca
MC		 3290
3291int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3292 enum iscsi_param param, char *buf, int buflen)
3293{
3294 struct iscsi_conn *conn = cls_conn->dd_data;
3295 struct iscsi_session *session = conn->session;
6a06a4b8 3296 int val;
a54a52ca
MC		 3297
3298 switch(param) {
843c0a8a
MC		 3299 case ISCSI_PARAM_FAST_ABORT:
3300 sscanf(buf, "%d", &session->fast_abort);
3301 break;
f6d5180c
MC		 3302 case ISCSI_PARAM_ABORT_TMO:
3303 sscanf(buf, "%d", &session->abort_timeout);
3304 break;
3305 case ISCSI_PARAM_LU_RESET_TMO:
3306 sscanf(buf, "%d", &session->lu_reset_timeout);
3307 break;
3fe5ae8b
MC		 3308 case ISCSI_PARAM_TGT_RESET_TMO:
3309 sscanf(buf, "%d", &session->tgt_reset_timeout);
3310 break;
f6d5180c
MC		 3311 case ISCSI_PARAM_PING_TMO:
3312 sscanf(buf, "%d", &conn->ping_timeout);
3313 break;
3314 case ISCSI_PARAM_RECV_TMO:
3315 sscanf(buf, "%d", &conn->recv_timeout);
3316 break;
a54a52ca
MC		 3317 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3318 sscanf(buf, "%d", &conn->max_recv_dlength);
3319 break;
3320 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3321 sscanf(buf, "%d", &conn->max_xmit_dlength);
3322 break;
3323 case ISCSI_PARAM_HDRDGST_EN:
3324 sscanf(buf, "%d", &conn->hdrdgst_en);
3325 break;
3326 case ISCSI_PARAM_DATADGST_EN:
3327 sscanf(buf, "%d", &conn->datadgst_en);
3328 break;
3329 case ISCSI_PARAM_INITIAL_R2T_EN:
3330 sscanf(buf, "%d", &session->initial_r2t_en);
3331 break;
3332 case ISCSI_PARAM_MAX_R2T:
1304be5f 3333 sscanf(buf, "%hu", &session->max_r2t);
a54a52ca
MC		 3334 break;
3335 case ISCSI_PARAM_IMM_DATA_EN:
3336 sscanf(buf, "%d", &session->imm_data_en);
3337 break;
3338 case ISCSI_PARAM_FIRST_BURST:
3339 sscanf(buf, "%d", &session->first_burst);
3340 break;
3341 case ISCSI_PARAM_MAX_BURST:
3342 sscanf(buf, "%d", &session->max_burst);
3343 break;
3344 case ISCSI_PARAM_PDU_INORDER_EN:
3345 sscanf(buf, "%d", &session->pdu_inorder_en);
3346 break;
3347 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3348 sscanf(buf, "%d", &session->dataseq_inorder_en);
3349 break;
3350 case ISCSI_PARAM_ERL:
3351 sscanf(buf, "%d", &session->erl);
3352 break;
a54a52ca
MC		 3353 case ISCSI_PARAM_EXP_STATSN:
3354 sscanf(buf, "%u", &conn->exp_statsn);
3355 break;
b2c64167 3356 case ISCSI_PARAM_USERNAME:
5700b1af 3357 return iscsi_switch_str_param(&session->username, buf);
b2c64167 3358 case ISCSI_PARAM_USERNAME_IN:
5700b1af 3359 return iscsi_switch_str_param(&session->username_in, buf);
b2c64167 3360 case ISCSI_PARAM_PASSWORD:
5700b1af 3361 return iscsi_switch_str_param(&session->password, buf);
b2c64167 3362 case ISCSI_PARAM_PASSWORD_IN:
5700b1af 3363 return iscsi_switch_str_param(&session->password_in, buf);
a54a52ca 3364 case ISCSI_PARAM_TARGET_NAME:
5700b1af 3365 return iscsi_switch_str_param(&session->targetname, buf);
3c5c4801
VC		 3366 case ISCSI_PARAM_TARGET_ALIAS:
3367 return iscsi_switch_str_param(&session->targetalias, buf);
a54a52ca
MC		 3368 case ISCSI_PARAM_TPGT:
3369 sscanf(buf, "%d", &session->tpgt);
3370 break;
3371 case ISCSI_PARAM_PERSISTENT_PORT:
3372 sscanf(buf, "%d", &conn->persistent_port);
3373 break;
3374 case ISCSI_PARAM_PERSISTENT_ADDRESS:
5700b1af 3375 return iscsi_switch_str_param(&conn->persistent_address, buf);
88dfd340 3376 case ISCSI_PARAM_IFACE_NAME:
5700b1af 3377 return iscsi_switch_str_param(&session->ifacename, buf);
88dfd340 3378 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3379 return iscsi_switch_str_param(&session->initiatorname, buf);
3b9373e9
EW		 3380 case ISCSI_PARAM_BOOT_ROOT:
3381 return iscsi_switch_str_param(&session->boot_root, buf);
3382 case ISCSI_PARAM_BOOT_NIC:
3383 return iscsi_switch_str_param(&session->boot_nic, buf);
3384 case ISCSI_PARAM_BOOT_TARGET:
3385 return iscsi_switch_str_param(&session->boot_target, buf);
f8525eb4
AC		 3386 case ISCSI_PARAM_PORTAL_TYPE:
3387 return iscsi_switch_str_param(&session->portal_type, buf);
3388 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3389 return iscsi_switch_str_param(&session->discovery_parent_type,
3390 buf);
6a06a4b8
OG		 3391 case ISCSI_PARAM_DISCOVERY_SESS:
3392 sscanf(buf, "%d", &val);
3393 session->discovery_sess = !!val;
3394 break;
ae56ff40
AC		 3395 case ISCSI_PARAM_LOCAL_IPADDR:
3396 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
a54a52ca
MC		 3397 default:
3398 return -ENOSYS;
3399 }
3400
3401 return 0;
3402}
3403EXPORT_SYMBOL_GPL(iscsi_set_param);
3404
3405int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3406 enum iscsi_param param, char *buf)
3407{
75613521 3408 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 3409 int len;
3410
3411 switch(param) {
843c0a8a 3412 case ISCSI_PARAM_FAST_ABORT:
ec98ea70 3413 len = sysfs_emit(buf, "%d\n", session->fast_abort);
843c0a8a 3414 break;
f6d5180c 3415 case ISCSI_PARAM_ABORT_TMO:
ec98ea70 3416 len = sysfs_emit(buf, "%d\n", session->abort_timeout);
f6d5180c
MC		 3417 break;
3418 case ISCSI_PARAM_LU_RESET_TMO:
ec98ea70 3419 len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout);
f6d5180c 3420 break;
3fe5ae8b 3421 case ISCSI_PARAM_TGT_RESET_TMO:
ec98ea70 3422 len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout);
3fe5ae8b 3423 break;
a54a52ca 3424 case ISCSI_PARAM_INITIAL_R2T_EN:
ec98ea70 3425 len = sysfs_emit(buf, "%d\n", session->initial_r2t_en);
a54a52ca
MC		 3426 break;
3427 case ISCSI_PARAM_MAX_R2T:
ec98ea70 3428 len = sysfs_emit(buf, "%hu\n", session->max_r2t);
a54a52ca
MC		 3429 break;
3430 case ISCSI_PARAM_IMM_DATA_EN:
ec98ea70 3431 len = sysfs_emit(buf, "%d\n", session->imm_data_en);
a54a52ca
MC		 3432 break;
3433 case ISCSI_PARAM_FIRST_BURST:
ec98ea70 3434 len = sysfs_emit(buf, "%u\n", session->first_burst);
a54a52ca
MC		 3435 break;
3436 case ISCSI_PARAM_MAX_BURST:
ec98ea70 3437 len = sysfs_emit(buf, "%u\n", session->max_burst);
a54a52ca
MC		 3438 break;
3439 case ISCSI_PARAM_PDU_INORDER_EN:
ec98ea70 3440 len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en);
a54a52ca
MC		 3441 break;
3442 case ISCSI_PARAM_DATASEQ_INORDER_EN:
ec98ea70 3443 len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en);
a54a52ca 3444 break;
5f09e1f3 3445 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
ec98ea70 3446 len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo);
5f09e1f3 3447 break;
a54a52ca 3448 case ISCSI_PARAM_ERL:
ec98ea70 3449 len = sysfs_emit(buf, "%d\n", session->erl);
a54a52ca
MC		 3450 break;
3451 case ISCSI_PARAM_TARGET_NAME:
ec98ea70 3452 len = sysfs_emit(buf, "%s\n", session->targetname);
a54a52ca 3453 break;
3c5c4801 3454 case ISCSI_PARAM_TARGET_ALIAS:
ec98ea70 3455 len = sysfs_emit(buf, "%s\n", session->targetalias);
3c5c4801 3456 break;
a54a52ca 3457 case ISCSI_PARAM_TPGT:
ec98ea70 3458 len = sysfs_emit(buf, "%d\n", session->tpgt);
a54a52ca 3459 break;
b2c64167 3460 case ISCSI_PARAM_USERNAME:
ec98ea70 3461 len = sysfs_emit(buf, "%s\n", session->username);
b2c64167
MC		 3462 break;
3463 case ISCSI_PARAM_USERNAME_IN:
ec98ea70 3464 len = sysfs_emit(buf, "%s\n", session->username_in);
b2c64167
MC		 3465 break;
3466 case ISCSI_PARAM_PASSWORD:
ec98ea70 3467 len = sysfs_emit(buf, "%s\n", session->password);
b2c64167
MC		 3468 break;
3469 case ISCSI_PARAM_PASSWORD_IN:
ec98ea70 3470 len = sysfs_emit(buf, "%s\n", session->password_in);
b2c64167 3471 break;
88dfd340 3472 case ISCSI_PARAM_IFACE_NAME:
ec98ea70 3473 len = sysfs_emit(buf, "%s\n", session->ifacename);
88dfd340
MC		 3474 break;
3475 case ISCSI_PARAM_INITIATOR_NAME:
ec98ea70 3476 len = sysfs_emit(buf, "%s\n", session->initiatorname);
88dfd340 3477 break;
3b9373e9 3478 case ISCSI_PARAM_BOOT_ROOT:
ec98ea70 3479 len = sysfs_emit(buf, "%s\n", session->boot_root);
3b9373e9
EW		 3480 break;
3481 case ISCSI_PARAM_BOOT_NIC:
ec98ea70 3482 len = sysfs_emit(buf, "%s\n", session->boot_nic);
3b9373e9
EW		 3483 break;
3484 case ISCSI_PARAM_BOOT_TARGET:
ec98ea70 3485 len = sysfs_emit(buf, "%s\n", session->boot_target);
9a2307b1 3486 break;
f8525eb4 3487 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
ec98ea70 3488 len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable);
f8525eb4
AC		 3489 break;
3490 case ISCSI_PARAM_DISCOVERY_SESS:
ec98ea70 3491 len = sysfs_emit(buf, "%u\n", session->discovery_sess);
f8525eb4
AC		 3492 break;
3493 case ISCSI_PARAM_PORTAL_TYPE:
ec98ea70 3494 len = sysfs_emit(buf, "%s\n", session->portal_type);
f8525eb4
AC		 3495 break;
3496 case ISCSI_PARAM_CHAP_AUTH_EN:
ec98ea70 3497 len = sysfs_emit(buf, "%u\n", session->chap_auth_en);
f8525eb4
AC		 3498 break;
3499 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
ec98ea70 3500 len = sysfs_emit(buf, "%u\n", session->discovery_logout_en);
f8525eb4
AC		 3501 break;
3502 case ISCSI_PARAM_BIDI_CHAP_EN:
ec98ea70 3503 len = sysfs_emit(buf, "%u\n", session->bidi_chap_en);
f8525eb4
AC		 3504 break;
3505 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
ec98ea70 3506 len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional);
f8525eb4
AC		 3507 break;
3508 case ISCSI_PARAM_DEF_TIME2WAIT:
ec98ea70 3509 len = sysfs_emit(buf, "%d\n", session->time2wait);
f8525eb4
AC		 3510 break;
3511 case ISCSI_PARAM_DEF_TIME2RETAIN:
ec98ea70 3512 len = sysfs_emit(buf, "%d\n", session->time2retain);
f8525eb4
AC		 3513 break;
3514 case ISCSI_PARAM_TSID:
ec98ea70 3515 len = sysfs_emit(buf, "%u\n", session->tsid);
f8525eb4
AC		 3516 break;
3517 case ISCSI_PARAM_ISID:
ec98ea70 3518 len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n",
f8525eb4
AC		 3519 session->isid[0], session->isid[1],
3520 session->isid[2], session->isid[3],
3521 session->isid[4], session->isid[5]);
3522 break;
3523 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
ec98ea70 3524 len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx);
f8525eb4
AC		 3525 break;
3526 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3527 if (session->discovery_parent_type)
ec98ea70 3528 len = sysfs_emit(buf, "%s\n",
f8525eb4
AC		 3529 session->discovery_parent_type);
3530 else
ec98ea70 3531 len = sysfs_emit(buf, "\n");
3b9373e9 3532 break;
a54a52ca
MC		 3533 default:
3534 return -ENOSYS;
3535 }
3536
3537 return len;
3538}
3539EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3540
00f3708e
MC		 3541int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3542 enum iscsi_param param, char *buf)
3543{
3544 struct sockaddr_in6 *sin6 = NULL;
3545 struct sockaddr_in *sin = NULL;
3546 int len;
3547
3548 switch (addr->ss_family) {
3549 case AF_INET:
3550 sin = (struct sockaddr_in *)addr;
3551 break;
3552 case AF_INET6:
3553 sin6 = (struct sockaddr_in6 *)addr;
3554 break;
3555 default:
3556 return -EINVAL;
3557 }
3558
3559 switch (param) {
3560 case ISCSI_PARAM_CONN_ADDRESS:
3561 case ISCSI_HOST_PARAM_IPADDRESS:
3562 if (sin)
ec98ea70 3563 len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr);
00f3708e 3564 else
ec98ea70 3565 len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr);
00f3708e
MC		 3566 break;
3567 case ISCSI_PARAM_CONN_PORT:
4bfb8ebf 3568 case ISCSI_PARAM_LOCAL_PORT:
00f3708e 3569 if (sin)
ec98ea70 3570 len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port));
00f3708e 3571 else
ec98ea70 3572 len = sysfs_emit(buf, "%hu\n",
00f3708e
MC		 3573 be16_to_cpu(sin6->sin6_port));
3574 break;
3575 default:
3576 return -EINVAL;
3577 }
3578
3579 return len;
3580}
3581EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3582
a54a52ca
MC		 3583int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3584 enum iscsi_param param, char *buf)
3585{
3586 struct iscsi_conn *conn = cls_conn->dd_data;
3587 int len;
3588
3589 switch(param) {
f6d5180c 3590 case ISCSI_PARAM_PING_TMO:
ec98ea70 3591 len = sysfs_emit(buf, "%u\n", conn->ping_timeout);
f6d5180c
MC		 3592 break;
3593 case ISCSI_PARAM_RECV_TMO:
ec98ea70 3594 len = sysfs_emit(buf, "%u\n", conn->recv_timeout);
f6d5180c 3595 break;
a54a52ca 3596 case ISCSI_PARAM_MAX_RECV_DLENGTH:
ec98ea70 3597 len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength);
a54a52ca
MC		 3598 break;
3599 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
ec98ea70 3600 len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength);
a54a52ca
MC		 3601 break;
3602 case ISCSI_PARAM_HDRDGST_EN:
ec98ea70 3603 len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en);
a54a52ca
MC		 3604 break;
3605 case ISCSI_PARAM_DATADGST_EN:
ec98ea70 3606 len = sysfs_emit(buf, "%d\n", conn->datadgst_en);
a54a52ca
MC		 3607 break;
3608 case ISCSI_PARAM_IFMARKER_EN:
ec98ea70 3609 len = sysfs_emit(buf, "%d\n", conn->ifmarker_en);
a54a52ca
MC		 3610 break;
3611 case ISCSI_PARAM_OFMARKER_EN:
ec98ea70 3612 len = sysfs_emit(buf, "%d\n", conn->ofmarker_en);
a54a52ca
MC		 3613 break;
3614 case ISCSI_PARAM_EXP_STATSN:
ec98ea70 3615 len = sysfs_emit(buf, "%u\n", conn->exp_statsn);
a54a52ca
MC		 3616 break;
3617 case ISCSI_PARAM_PERSISTENT_PORT:
ec98ea70 3618 len = sysfs_emit(buf, "%d\n", conn->persistent_port);
a54a52ca
MC		 3619 break;
3620 case ISCSI_PARAM_PERSISTENT_ADDRESS:
ec98ea70 3621 len = sysfs_emit(buf, "%s\n", conn->persistent_address);
a54a52ca 3622 break;
f8525eb4 3623 case ISCSI_PARAM_STATSN:
ec98ea70 3624 len = sysfs_emit(buf, "%u\n", conn->statsn);
f8525eb4
AC		 3625 break;
3626 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
ec98ea70 3627 len = sysfs_emit(buf, "%u\n", conn->max_segment_size);
f8525eb4
AC		 3628 break;
3629 case ISCSI_PARAM_KEEPALIVE_TMO:
ec98ea70 3630 len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo);
f8525eb4
AC		 3631 break;
3632 case ISCSI_PARAM_LOCAL_PORT:
ec98ea70 3633 len = sysfs_emit(buf, "%u\n", conn->local_port);
f8525eb4
AC		 3634 break;
3635 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
ec98ea70 3636 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat);
f8525eb4
AC		 3637 break;
3638 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
ec98ea70 3639 len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable);
f8525eb4
AC		 3640 break;
3641 case ISCSI_PARAM_TCP_WSF_DISABLE:
ec98ea70 3642 len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable);
f8525eb4
AC		 3643 break;
3644 case ISCSI_PARAM_TCP_TIMER_SCALE:
ec98ea70 3645 len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale);
f8525eb4
AC		 3646 break;
3647 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
ec98ea70 3648 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en);
f8525eb4
AC		 3649 break;
3650 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
ec98ea70 3651 len = sysfs_emit(buf, "%u\n", conn->fragment_disable);
f8525eb4
AC		 3652 break;
3653 case ISCSI_PARAM_IPV4_TOS:
ec98ea70 3654 len = sysfs_emit(buf, "%u\n", conn->ipv4_tos);
f8525eb4
AC		 3655 break;
3656 case ISCSI_PARAM_IPV6_TC:
ec98ea70 3657 len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class);
f8525eb4 3658 break;
5f09e1f3 3659 case ISCSI_PARAM_IPV6_FLOW_LABEL:
ec98ea70 3660 len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label);
5f09e1f3 3661 break;
f8525eb4 3662 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
ec98ea70 3663 len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6);
f8525eb4
AC		 3664 break;
3665 case ISCSI_PARAM_TCP_XMIT_WSF:
ec98ea70 3666 len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf);
f8525eb4
AC		 3667 break;
3668 case ISCSI_PARAM_TCP_RECV_WSF:
ec98ea70 3669 len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf);
f8525eb4 3670 break;
ae56ff40 3671 case ISCSI_PARAM_LOCAL_IPADDR:
ec98ea70 3672 len = sysfs_emit(buf, "%s\n", conn->local_ipaddr);
ae56ff40 3673 break;
a54a52ca
MC		 3674 default:
3675 return -ENOSYS;
3676 }
3677
3678 return len;
3679}
3680EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3681
0801c242
MC		 3682int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3683 char *buf)
3684{
75613521 3685 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3686 int len;
3687
3688 switch (param) {
d8196ed2 3689 case ISCSI_HOST_PARAM_NETDEV_NAME:
ec98ea70 3690 len = sysfs_emit(buf, "%s\n", ihost->netdev);
d8196ed2 3691 break;
0801c242 3692 case ISCSI_HOST_PARAM_HWADDRESS:
ec98ea70 3693 len = sysfs_emit(buf, "%s\n", ihost->hwaddress);
0801c242 3694 break;
8ad5781a 3695 case ISCSI_HOST_PARAM_INITIATOR_NAME:
ec98ea70 3696 len = sysfs_emit(buf, "%s\n", ihost->initiatorname);
8ad5781a 3697 break;
0801c242
MC		 3698 default:
3699 return -ENOSYS;
3700 }
3701
3702 return len;
3703}
3704EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3705
3706int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3707 char *buf, int buflen)
3708{
75613521 3709 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3710
3711 switch (param) {
d8196ed2 3712 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3713 return iscsi_switch_str_param(&ihost->netdev, buf);
0801c242 3714 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3715 return iscsi_switch_str_param(&ihost->hwaddress, buf);
8ad5781a 3716 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3717 return iscsi_switch_str_param(&ihost->initiatorname, buf);
0801c242
MC		 3718 default:
3719 return -ENOSYS;
3720 }
3721
3722 return 0;
3723}
3724EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3725
7996a778
MC		 3726MODULE_AUTHOR("Mike Christie");
3727MODULE_DESCRIPTION("iSCSI library functions");
3728MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)