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acer-wmi: Only update rfkill status for associated hotkey events
[linux-2.6-block.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 1/*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24#include <linux/types.h>
7996a778
MC		 25#include <linux/kfifo.h>
26#include <linux/delay.h>
11836572 27#include <linux/log2.h>
5a0e3ad6 28#include <linux/slab.h>
8eb00539 29#include <asm/unaligned.h>
7996a778
MC		 30#include <net/tcp.h>
31#include <scsi/scsi_cmnd.h>
32#include <scsi/scsi_device.h>
33#include <scsi/scsi_eh.h>
34#include <scsi/scsi_tcq.h>
35#include <scsi/scsi_host.h>
36#include <scsi/scsi.h>
37#include <scsi/iscsi_proto.h>
38#include <scsi/scsi_transport.h>
39#include <scsi/scsi_transport_iscsi.h>
40#include <scsi/libiscsi.h>
41
bd2199d4
EZ		 42static int iscsi_dbg_lib_conn;
43module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
44 S_IRUGO | S_IWUSR);
45MODULE_PARM_DESC(debug_libiscsi_conn,
46 "Turn on debugging for connections in libiscsi module. "
47 "Set to 1 to turn on, and zero to turn off. Default is off.");
48
49static int iscsi_dbg_lib_session;
50module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
51 S_IRUGO | S_IWUSR);
52MODULE_PARM_DESC(debug_libiscsi_session,
53 "Turn on debugging for sessions in libiscsi module. "
54 "Set to 1 to turn on, and zero to turn off. Default is off.");
55
56static int iscsi_dbg_lib_eh;
57module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
58 S_IRUGO | S_IWUSR);
59MODULE_PARM_DESC(debug_libiscsi_eh,
60 "Turn on debugging for error handling in libiscsi module. "
61 "Set to 1 to turn on, and zero to turn off. Default is off.");
1b2c7af8
MC		 62
63#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
64 do { \
bd2199d4 65 if (iscsi_dbg_lib_conn) \
1b2c7af8
MC		 66 iscsi_conn_printk(KERN_INFO, _conn, \
67 "%s " dbg_fmt, \
68 __func__, ##arg); \
69 } while (0);
70
71#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
72 do { \
bd2199d4
EZ		 73 if (iscsi_dbg_lib_session) \
74 iscsi_session_printk(KERN_INFO, _session, \
75 "%s " dbg_fmt, \
76 __func__, ##arg); \
77 } while (0);
78
79#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
80 do { \
81 if (iscsi_dbg_lib_eh) \
1b2c7af8
MC		 82 iscsi_session_printk(KERN_INFO, _session, \
83 "%s " dbg_fmt, \
84 __func__, ##arg); \
85 } while (0);
86
77a23c21
MC		 87/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
88#define SNA32_CHECK 2147483648UL
7996a778 89
77a23c21
MC		 90static int iscsi_sna_lt(u32 n1, u32 n2)
91{
92 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
93 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
94}
95
96/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
97static int iscsi_sna_lte(u32 n1, u32 n2)
98{
99 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
100 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
101}
102
32ae763e
MC		 103inline void iscsi_conn_queue_work(struct iscsi_conn *conn)
104{
105 struct Scsi_Host *shost = conn->session->host;
106 struct iscsi_host *ihost = shost_priv(shost);
107
1336aed1
MC		 108 if (ihost->workq)
109 queue_work(ihost->workq, &conn->xmitwork);
32ae763e
MC		 110}
111EXPORT_SYMBOL_GPL(iscsi_conn_queue_work);
112
4c0ba5d2
MC		 113static void __iscsi_update_cmdsn(struct iscsi_session *session,
114 uint32_t exp_cmdsn, uint32_t max_cmdsn)
7996a778 115{
77a23c21
MC		 116 /*
117 * standard specifies this check for when to update expected and
118 * max sequence numbers
119 */
120 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
121 return;
122
123 if (exp_cmdsn != session->exp_cmdsn &&
124 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 125 session->exp_cmdsn = exp_cmdsn;
126
77a23c21
MC		 127 if (max_cmdsn != session->max_cmdsn &&
128 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
129 session->max_cmdsn = max_cmdsn;
130 /*
131 * if the window closed with IO queued, then kick the
132 * xmit thread
133 */
3bbaaad9 134 if (!list_empty(&session->leadconn->cmdqueue) ||
1336aed1
MC		 135 !list_empty(&session->leadconn->mgmtqueue))
136 iscsi_conn_queue_work(session->leadconn);
77a23c21 137 }
7996a778 138}
4c0ba5d2
MC		 139
140void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
141{
142 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
143 be32_to_cpu(hdr->max_cmdsn));
144}
77a23c21 145EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778 146
577577da
MC		 147/**
148 * iscsi_prep_data_out_pdu - initialize Data-Out
149 * @task: scsi command task
150 * @r2t: R2T info
151 * @hdr: iscsi data in pdu
152 *
153 * Notes:
154 * Initialize Data-Out within this R2T sequence and finds
155 * proper data_offset within this SCSI command.
156 *
157 * This function is called with connection lock taken.
158 **/
159void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
160 struct iscsi_data *hdr)
7996a778 161{
9c19a7d0 162 struct iscsi_conn *conn = task->conn;
577577da
MC		 163 unsigned int left = r2t->data_length - r2t->sent;
164
165 task->hdr_len = sizeof(struct iscsi_data);
7996a778
MC		 166
167 memset(hdr, 0, sizeof(struct iscsi_data));
577577da
MC		 168 hdr->ttt = r2t->ttt;
169 hdr->datasn = cpu_to_be32(r2t->datasn);
170 r2t->datasn++;
7996a778 171 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
577577da
MC		 172 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
173 hdr->itt = task->hdr_itt;
174 hdr->exp_statsn = r2t->exp_statsn;
175 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
176 if (left > conn->max_xmit_dlength) {
7996a778 177 hton24(hdr->dlength, conn->max_xmit_dlength);
577577da 178 r2t->data_count = conn->max_xmit_dlength;
7996a778
MC		 179 hdr->flags = 0;
180 } else {
577577da
MC		 181 hton24(hdr->dlength, left);
182 r2t->data_count = left;
7996a778
MC		 183 hdr->flags = ISCSI_FLAG_CMD_FINAL;
184 }
577577da 185 conn->dataout_pdus_cnt++;
7996a778 186}
577577da 187EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
7996a778 188
9c19a7d0 189static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
004d6530 190{
9c19a7d0 191 unsigned exp_len = task->hdr_len + len;
004d6530 192
9c19a7d0 193 if (exp_len > task->hdr_max) {
004d6530
BH		 194 WARN_ON(1);
195 return -EINVAL;
196 }
197
198 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
9c19a7d0 199 task->hdr_len = exp_len;
004d6530
BH		 200 return 0;
201}
202
38d1c069
BH		 203/*
204 * make an extended cdb AHS
205 */
9c19a7d0 206static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
38d1c069 207{
9c19a7d0 208 struct scsi_cmnd *cmd = task->sc;
38d1c069
BH		 209 unsigned rlen, pad_len;
210 unsigned short ahslength;
211 struct iscsi_ecdb_ahdr *ecdb_ahdr;
212 int rc;
213
9c19a7d0 214 ecdb_ahdr = iscsi_next_hdr(task);
38d1c069
BH		 215 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
216
217 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
218 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
219
220 pad_len = iscsi_padding(rlen);
221
9c19a7d0 222 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
38d1c069
BH		 223 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
224 if (rc)
225 return rc;
226
227 if (pad_len)
228 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
229
230 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
231 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
232 ecdb_ahdr->reserved = 0;
233 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
234
1b2c7af8
MC		 235 ISCSI_DBG_SESSION(task->conn->session,
236 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
237 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
238 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
239 task->hdr_len);
38d1c069
BH		 240 return 0;
241}
242
9c19a7d0 243static int iscsi_prep_bidi_ahs(struct iscsi_task *task)
c07d4444 244{
9c19a7d0 245 struct scsi_cmnd *sc = task->sc;
c07d4444
BH		 246 struct iscsi_rlength_ahdr *rlen_ahdr;
247 int rc;
248
9c19a7d0
MC		 249 rlen_ahdr = iscsi_next_hdr(task);
250 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr));
c07d4444
BH		 251 if (rc)
252 return rc;
253
254 rlen_ahdr->ahslength =
255 cpu_to_be16(sizeof(rlen_ahdr->read_length) +
256 sizeof(rlen_ahdr->reserved));
257 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH;
258 rlen_ahdr->reserved = 0;
259 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length);
260
1b2c7af8
MC		 261 ISCSI_DBG_SESSION(task->conn->session,
262 "bidi-in rlen_ahdr->read_length(%d) "
263 "rlen_ahdr->ahslength(%d)\n",
264 be32_to_cpu(rlen_ahdr->read_length),
265 be16_to_cpu(rlen_ahdr->ahslength));
c07d4444
BH		 266 return 0;
267}
268
5d12c05e
MC		 269/**
270 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
271 * @task: iscsi task
272 * @opcode: opcode to check for
273 *
274 * During TMF a task has to be checked if it's affected.
275 * All unrelated I/O can be passed through, but I/O to the
276 * affected LUN should be restricted.
277 * If 'fast_abort' is set we won't be sending any I/O to the
278 * affected LUN.
279 * Otherwise the target is waiting for all TTTs to be completed,
280 * so we have to send all outstanding Data-Out PDUs to the target.
281 */
282static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
283{
284 struct iscsi_conn *conn = task->conn;
285 struct iscsi_tm *tmf = &conn->tmhdr;
286 unsigned int hdr_lun;
287
288 if (conn->tmf_state == TMF_INITIAL)
289 return 0;
290
291 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
292 return 0;
293
294 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
295 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
296 /*
297 * Allow PDUs for unrelated LUNs
298 */
299 hdr_lun = scsilun_to_int((struct scsi_lun *)tmf->lun);
300 if (hdr_lun != task->sc->device->lun)
301 return 0;
3fe5ae8b
MC		 302 /* fall through */
303 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
5d12c05e
MC		 304 /*
305 * Fail all SCSI cmd PDUs
306 */
307 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
308 iscsi_conn_printk(KERN_INFO, conn,
309 "task [op %x/%x itt "
3fe5ae8b 310 "0x%x/0x%x] "
5d12c05e
MC		 311 "rejected.\n",
312 task->hdr->opcode, opcode,
3fe5ae8b 313 task->itt, task->hdr_itt);
5d12c05e
MC		 314 return -EACCES;
315 }
316 /*
317 * And also all data-out PDUs in response to R2T
318 * if fast_abort is set.
319 */
320 if (conn->session->fast_abort) {
321 iscsi_conn_printk(KERN_INFO, conn,
322 "task [op %x/%x itt "
3fe5ae8b 323 "0x%x/0x%x] fast abort.\n",
5d12c05e 324 task->hdr->opcode, opcode,
3fe5ae8b 325 task->itt, task->hdr_itt);
5d12c05e
MC		 326 return -EACCES;
327 }
328 break;
329 case ISCSI_TM_FUNC_ABORT_TASK:
330 /*
331 * the caller has already checked if the task
332 * they want to abort was in the pending queue so if
333 * we are here the cmd pdu has gone out already, and
334 * we will only hit this for data-outs
335 */
336 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
337 task->hdr_itt == tmf->rtt) {
338 ISCSI_DBG_SESSION(conn->session,
339 "Preventing task %x/%x from sending "
340 "data-out due to abort task in "
341 "progress\n", task->itt,
342 task->hdr_itt);
343 return -EACCES;
344 }
345 break;
346 }
347
348 return 0;
349}
350
7996a778
MC		 351/**
352 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
9c19a7d0 353 * @task: iscsi task
7996a778
MC		 354 *
355 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
356 * fields like dlength or final based on how much data it sends
357 */
9c19a7d0 358static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
7996a778 359{
9c19a7d0 360 struct iscsi_conn *conn = task->conn;
7996a778 361 struct iscsi_session *session = conn->session;
9c19a7d0 362 struct scsi_cmnd *sc = task->sc;
577577da 363 struct iscsi_cmd *hdr;
38d1c069 364 unsigned hdrlength, cmd_len;
262ef636 365 itt_t itt;
004d6530 366 int rc;
7996a778 367
5d12c05e
MC		 368 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
369 if (rc)
370 return rc;
371
184b57c6
MC		 372 if (conn->session->tt->alloc_pdu) {
373 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
374 if (rc)
375 return rc;
376 }
577577da 377 hdr = (struct iscsi_cmd *) task->hdr;
262ef636 378 itt = hdr->itt;
577577da
MC		 379 memset(hdr, 0, sizeof(*hdr));
380
2ff79d52
MC		 381 if (session->tt->parse_pdu_itt)
382 hdr->itt = task->hdr_itt = itt;
383 else
384 hdr->itt = task->hdr_itt = build_itt(task->itt,
385 task->conn->session->age);
9c19a7d0
MC		 386 task->hdr_len = 0;
387 rc = iscsi_add_hdr(task, sizeof(*hdr));
004d6530
BH		 388 if (rc)
389 return rc;
a8ac6311
OK		 390 hdr->opcode = ISCSI_OP_SCSI_CMD;
391 hdr->flags = ISCSI_ATTR_SIMPLE;
392 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
577577da 393 memcpy(task->lun, hdr->lun, sizeof(task->lun));
a8ac6311 394 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 395 cmd_len = sc->cmd_len;
396 if (cmd_len < ISCSI_CDB_SIZE)
397 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
398 else if (cmd_len > ISCSI_CDB_SIZE) {
9c19a7d0 399 rc = iscsi_prep_ecdb_ahs(task);
38d1c069
BH		 400 if (rc)
401 return rc;
402 cmd_len = ISCSI_CDB_SIZE;
403 }
404 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 405
9c19a7d0 406 task->imm_count = 0;
c07d4444
BH		 407 if (scsi_bidi_cmnd(sc)) {
408 hdr->flags |= ISCSI_FLAG_CMD_READ;
9c19a7d0 409 rc = iscsi_prep_bidi_ahs(task);
c07d4444
BH		 410 if (rc)
411 return rc;
412 }
7996a778 413 if (sc->sc_data_direction == DMA_TO_DEVICE) {
c07d4444 414 unsigned out_len = scsi_out(sc)->length;
577577da
MC		 415 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
416
c07d4444 417 hdr->data_length = cpu_to_be32(out_len);
7996a778
MC		 418 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
419 /*
420 * Write counters:
421 *
422 * imm_count bytes to be sent right after
423 * SCSI PDU Header
424 *
425 * unsol_count bytes(as Data-Out) to be sent
426 * without R2T ack right after
427 * immediate data
428 *
577577da 429 * r2t data_length bytes to be sent via R2T ack's
7996a778
MC		 430 *
431 * pad_count bytes to be sent as zero-padding
432 */
577577da 433 memset(r2t, 0, sizeof(*r2t));
7996a778
MC		 434
435 if (session->imm_data_en) {
c07d4444 436 if (out_len >= session->first_burst)
9c19a7d0 437 task->imm_count = min(session->first_burst,
7996a778
MC		 438 conn->max_xmit_dlength);
439 else
9c19a7d0 440 task->imm_count = min(out_len,
7996a778 441 conn->max_xmit_dlength);
9c19a7d0 442 hton24(hdr->dlength, task->imm_count);
7996a778 443 } else
a8ac6311 444 zero_data(hdr->dlength);
7996a778 445
ffd0436e 446 if (!session->initial_r2t_en) {
577577da
MC		 447 r2t->data_length = min(session->first_burst, out_len) -
448 task->imm_count;
449 r2t->data_offset = task->imm_count;
450 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
451 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e
MC		 452 }
453
577577da 454 if (!task->unsol_r2t.data_length)
7996a778 455 /* No unsolicit Data-Out's */
a8ac6311 456 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 457 } else {
7996a778
MC		 458 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
459 zero_data(hdr->dlength);
c07d4444 460 hdr->data_length = cpu_to_be32(scsi_in(sc)->length);
7996a778
MC		 461
462 if (sc->sc_data_direction == DMA_FROM_DEVICE)
463 hdr->flags |= ISCSI_FLAG_CMD_READ;
464 }
465
004d6530 466 /* calculate size of additional header segments (AHSs) */
9c19a7d0 467 hdrlength = task->hdr_len - sizeof(*hdr);
004d6530
BH		 468
469 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
470 hdrlength /= ISCSI_PAD_LEN;
471
472 WARN_ON(hdrlength >= 256);
473 hdr->hlength = hdrlength & 0xFF;
96b1f96d 474 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
004d6530 475
577577da 476 if (session->tt->init_task && session->tt->init_task(task))
052d0144
MC		 477 return -EIO;
478
9c19a7d0 479 task->state = ISCSI_TASK_RUNNING;
d3305f34 480 session->cmdsn++;
77a23c21 481
a8ac6311 482 conn->scsicmd_pdus_cnt++;
1b2c7af8
MC		 483 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
484 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n",
485 scsi_bidi_cmnd(sc) ? "bidirectional" :
486 sc->sc_data_direction == DMA_TO_DEVICE ?
487 "write" : "read", conn->id, sc, sc->cmnd[0],
488 task->itt, scsi_bufflen(sc),
489 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0,
490 session->cmdsn,
491 session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 492 return 0;
7996a778 493}
7996a778
MC		 494
495/**
3bbaaad9 496 * iscsi_free_task - free a task
9c19a7d0 497 * @task: iscsi cmd task
7996a778
MC		 498 *
499 * Must be called with session lock.
3e5c28ad
MC		 500 * This function returns the scsi command to scsi-ml or cleans
501 * up mgmt tasks then returns the task to the pool.
7996a778 502 */
3bbaaad9 503static void iscsi_free_task(struct iscsi_task *task)
7996a778 504{
9c19a7d0 505 struct iscsi_conn *conn = task->conn;
c1635cb7 506 struct iscsi_session *session = conn->session;
9c19a7d0 507 struct scsi_cmnd *sc = task->sc;
f41d4721 508 int oldstate = task->state;
7996a778 509
4421c9eb
MC		 510 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
511 task->itt, task->state, task->sc);
512
577577da 513 session->tt->cleanup_task(task);
3bbaaad9 514 task->state = ISCSI_TASK_FREE;
9c19a7d0 515 task->sc = NULL;
3e5c28ad 516 /*
9c19a7d0 517 * login task is preallocated so do not free
3e5c28ad 518 */
9c19a7d0 519 if (conn->login_task == task)
3e5c28ad
MC		 520 return;
521
7acd72eb 522 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
052d0144 523
3e5c28ad 524 if (sc) {
9c19a7d0 525 task->sc = NULL;
3e5c28ad
MC		 526 /* SCSI eh reuses commands to verify us */
527 sc->SCp.ptr = NULL;
528 /*
f41d4721
MC		 529 * queue command may call this to free the task, so
530 * it will decide how to return sc to scsi-ml.
3e5c28ad 531 */
f41d4721 532 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
3e5c28ad
MC		 533 sc->scsi_done(sc);
534 }
7996a778
MC		 535}
536
913e5bf4 537void __iscsi_get_task(struct iscsi_task *task)
60ecebf5 538{
9c19a7d0 539 atomic_inc(&task->refcount);
60ecebf5 540}
913e5bf4 541EXPORT_SYMBOL_GPL(__iscsi_get_task);
60ecebf5 542
8eea2f55 543void __iscsi_put_task(struct iscsi_task *task)
60ecebf5 544{
9c19a7d0 545 if (atomic_dec_and_test(&task->refcount))
3bbaaad9 546 iscsi_free_task(task);
60ecebf5 547}
8eea2f55 548EXPORT_SYMBOL_GPL(__iscsi_put_task);
60ecebf5 549
9c19a7d0 550void iscsi_put_task(struct iscsi_task *task)
3e5c28ad 551{
9c19a7d0 552 struct iscsi_session *session = task->conn->session;
3e5c28ad
MC		 553
554 spin_lock_bh(&session->lock);
9c19a7d0 555 __iscsi_put_task(task);
3e5c28ad
MC		 556 spin_unlock_bh(&session->lock);
557}
9c19a7d0 558EXPORT_SYMBOL_GPL(iscsi_put_task);
3e5c28ad 559
3bbaaad9
MC		 560/**
561 * iscsi_complete_task - finish a task
562 * @task: iscsi cmd task
b3cd5050 563 * @state: state to complete task with
3bbaaad9
MC		 564 *
565 * Must be called with session lock.
566 */
b3cd5050 567static void iscsi_complete_task(struct iscsi_task *task, int state)
3bbaaad9
MC		 568{
569 struct iscsi_conn *conn = task->conn;
570
4421c9eb
MC		 571 ISCSI_DBG_SESSION(conn->session,
572 "complete task itt 0x%x state %d sc %p\n",
573 task->itt, task->state, task->sc);
b3cd5050
MC		 574 if (task->state == ISCSI_TASK_COMPLETED ||
575 task->state == ISCSI_TASK_ABRT_TMF ||
f41d4721
MC		 576 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
577 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
3bbaaad9
MC		 578 return;
579 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
b3cd5050 580 task->state = state;
3bbaaad9
MC		 581
582 if (!list_empty(&task->running))
583 list_del_init(&task->running);
584
585 if (conn->task == task)
586 conn->task = NULL;
587
588 if (conn->ping_task == task)
589 conn->ping_task = NULL;
590
591 /* release get from queueing */
592 __iscsi_put_task(task);
593}
594
4c0ba5d2
MC		 595/**
596 * iscsi_complete_scsi_task - finish scsi task normally
597 * @task: iscsi task for scsi cmd
598 * @exp_cmdsn: expected cmd sn in cpu format
599 * @max_cmdsn: max cmd sn in cpu format
600 *
601 * This is used when drivers do not need or cannot perform
602 * lower level pdu processing.
603 *
604 * Called with session lock
605 */
606void iscsi_complete_scsi_task(struct iscsi_task *task,
607 uint32_t exp_cmdsn, uint32_t max_cmdsn)
608{
609 struct iscsi_conn *conn = task->conn;
610
611 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
612
613 conn->last_recv = jiffies;
614 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
615 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
616}
617EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
618
619
b3a7ea8d 620/*
3bbaaad9
MC		 621 * session lock must be held and if not called for a task that is
622 * still pending or from the xmit thread, then xmit thread must
623 * be suspended.
b3a7ea8d 624 */
3bbaaad9 625static void fail_scsi_task(struct iscsi_task *task, int err)
b3a7ea8d 626{
3bbaaad9 627 struct iscsi_conn *conn = task->conn;
b3a7ea8d 628 struct scsi_cmnd *sc;
b3cd5050 629 int state;
b3a7ea8d 630
3bbaaad9
MC		 631 /*
632 * if a command completes and we get a successful tmf response
633 * we will hit this because the scsi eh abort code does not take
634 * a ref to the task.
635 */
9c19a7d0 636 sc = task->sc;
b3a7ea8d
MC		 637 if (!sc)
638 return;
639
b3cd5050 640 if (task->state == ISCSI_TASK_PENDING) {
b3a7ea8d
MC		 641 /*
642 * cmd never made it to the xmit thread, so we should not count
643 * the cmd in the sequencing
644 */
645 conn->session->queued_cmdsn--;
b3cd5050
MC		 646 /* it was never sent so just complete like normal */
647 state = ISCSI_TASK_COMPLETED;
648 } else if (err == DID_TRANSPORT_DISRUPTED)
649 state = ISCSI_TASK_ABRT_SESS_RECOV;
650 else
651 state = ISCSI_TASK_ABRT_TMF;
b3a7ea8d 652
b3cd5050 653 sc->result = err << 16;
c07d4444
BH		 654 if (!scsi_bidi_cmnd(sc))
655 scsi_set_resid(sc, scsi_bufflen(sc));
656 else {
657 scsi_out(sc)->resid = scsi_out(sc)->length;
658 scsi_in(sc)->resid = scsi_in(sc)->length;
659 }
3e5c28ad 660
b3cd5050 661 iscsi_complete_task(task, state);
b3a7ea8d
MC		 662}
663
3e5c28ad 664static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
9c19a7d0 665 struct iscsi_task *task)
052d0144
MC		 666{
667 struct iscsi_session *session = conn->session;
577577da 668 struct iscsi_hdr *hdr = task->hdr;
052d0144 669 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
4f704dc0 670 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
052d0144
MC		 671
672 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
673 return -ENOTCONN;
674
4f704dc0 675 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
052d0144
MC		 676 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
677 /*
678 * pre-format CmdSN for outgoing PDU.
679 */
680 nop->cmdsn = cpu_to_be32(session->cmdsn);
681 if (hdr->itt != RESERVED_ITT) {
052d0144 682 /*
4f704dc0 683 * TODO: We always use immediate for normal session pdus.
052d0144
MC		 684 * If we start to send tmfs or nops as non-immediate then
685 * we should start checking the cmdsn numbers for mgmt tasks.
4f704dc0
MC		 686 *
687 * During discovery sessions iscsid sends TEXT as non immediate,
688 * but we always only send one PDU at a time.
052d0144
MC		 689 */
690 if (conn->c_stage == ISCSI_CONN_STARTED &&
691 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
692 session->queued_cmdsn++;
693 session->cmdsn++;
694 }
695 }
696
ae15f801
MC		 697 if (session->tt->init_task && session->tt->init_task(task))
698 return -EIO;
052d0144
MC		 699
700 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
701 session->state = ISCSI_STATE_LOGGING_OUT;
702
577577da 703 task->state = ISCSI_TASK_RUNNING;
1b2c7af8
MC		 704 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
705 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
706 hdr->itt, task->data_count);
052d0144
MC		 707 return 0;
708}
709
9c19a7d0 710static struct iscsi_task *
f6d5180c
MC		 711__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
712 char *data, uint32_t data_size)
713{
714 struct iscsi_session *session = conn->session;
1336aed1 715 struct iscsi_host *ihost = shost_priv(session->host);
4f704dc0 716 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
9c19a7d0 717 struct iscsi_task *task;
262ef636 718 itt_t itt;
f6d5180c
MC		 719
720 if (session->state == ISCSI_STATE_TERMINATE)
721 return NULL;
722
4f704dc0 723 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
f6d5180c
MC		 724 /*
725 * Login and Text are sent serially, in
726 * request-followed-by-response sequence.
3e5c28ad
MC		 727 * Same task can be used. Same ITT must be used.
728 * Note that login_task is preallocated at conn_create().
f6d5180c 729 */
4f704dc0
MC		 730 if (conn->login_task->state != ISCSI_TASK_FREE) {
731 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
732 "progress. Cannot start new task.\n");
733 return NULL;
734 }
735
9c19a7d0 736 task = conn->login_task;
4f704dc0 737 } else {
26013ad4
MC		 738 if (session->state != ISCSI_STATE_LOGGED_IN)
739 return NULL;
740
f6d5180c
MC		 741 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
742 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
743
7acd72eb 744 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 745 (void*)&task, sizeof(void*)))
f6d5180c
MC		 746 return NULL;
747 }
3e5c28ad
MC		 748 /*
749 * released in complete pdu for task we expect a response for, and
750 * released by the lld when it has transmitted the task for
751 * pdus we do not expect a response for.
752 */
9c19a7d0
MC		 753 atomic_set(&task->refcount, 1);
754 task->conn = conn;
755 task->sc = NULL;
3bbaaad9
MC		 756 INIT_LIST_HEAD(&task->running);
757 task->state = ISCSI_TASK_PENDING;
f6d5180c
MC		 758
759 if (data_size) {
9c19a7d0
MC		 760 memcpy(task->data, data, data_size);
761 task->data_count = data_size;
f6d5180c 762 } else
9c19a7d0 763 task->data_count = 0;
f6d5180c 764
184b57c6
MC		 765 if (conn->session->tt->alloc_pdu) {
766 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
767 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
768 "pdu for mgmt task.\n");
3bbaaad9 769 goto free_task;
184b57c6 770 }
577577da 771 }
184b57c6 772
262ef636 773 itt = task->hdr->itt;
577577da 774 task->hdr_len = sizeof(struct iscsi_hdr);
9c19a7d0 775 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
262ef636
MC		 776
777 if (hdr->itt != RESERVED_ITT) {
778 if (session->tt->parse_pdu_itt)
779 task->hdr->itt = itt;
780 else
781 task->hdr->itt = build_itt(task->itt,
782 task->conn->session->age);
783 }
784
1336aed1 785 if (!ihost->workq) {
577577da
MC		 786 if (iscsi_prep_mgmt_task(conn, task))
787 goto free_task;
052d0144 788
9c19a7d0 789 if (session->tt->xmit_task(task))
577577da 790 goto free_task;
3bbaaad9
MC		 791 } else {
792 list_add_tail(&task->running, &conn->mgmtqueue);
32ae763e 793 iscsi_conn_queue_work(conn);
3bbaaad9 794 }
052d0144 795
9c19a7d0 796 return task;
577577da
MC		 797
798free_task:
799 __iscsi_put_task(task);
800 return NULL;
f6d5180c
MC		 801}
802
803int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
804 char *data, uint32_t data_size)
805{
806 struct iscsi_conn *conn = cls_conn->dd_data;
807 struct iscsi_session *session = conn->session;
808 int err = 0;
809
810 spin_lock_bh(&session->lock);
811 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
812 err = -EPERM;
813 spin_unlock_bh(&session->lock);
f6d5180c
MC		 814 return err;
815}
816EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
817
7996a778
MC		 818/**
819 * iscsi_cmd_rsp - SCSI Command Response processing
820 * @conn: iscsi connection
821 * @hdr: iscsi header
9c19a7d0 822 * @task: scsi command task
7996a778
MC		 823 * @data: cmd data buffer
824 * @datalen: len of buffer
825 *
826 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
9c19a7d0 827 * then completes the command and task.
7996a778 828 **/
77a23c21 829static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
9c19a7d0 830 struct iscsi_task *task, char *data,
77a23c21 831 int datalen)
7996a778 832{
7996a778
MC		 833 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
834 struct iscsi_session *session = conn->session;
9c19a7d0 835 struct scsi_cmnd *sc = task->sc;
7996a778 836
77a23c21 837 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 838 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
839
840 sc->result = (DID_OK << 16) | rhdr->cmd_status;
841
842 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
843 sc->result = DID_ERROR << 16;
844 goto out;
845 }
846
847 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 848 uint16_t senselen;
7996a778
MC		 849
850 if (datalen < 2) {
851invalid_datalen:
322d739d
MC		 852 iscsi_conn_printk(KERN_ERR, conn,
853 "Got CHECK_CONDITION but invalid data "
854 "buffer size of %d\n", datalen);
7996a778
MC		 855 sc->result = DID_BAD_TARGET << 16;
856 goto out;
857 }
858
8f333991 859 senselen = get_unaligned_be16(data);
7996a778
MC		 860 if (datalen < senselen)
861 goto invalid_datalen;
862
863 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 864 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
1b2c7af8
MC		 865 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
866 min_t(uint16_t, senselen,
867 SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 868 }
869
c07d4444
BH		 870 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
871 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
872 int res_count = be32_to_cpu(rhdr->bi_residual_count);
873
874 if (scsi_bidi_cmnd(sc) && res_count > 0 &&
875 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW ||
876 res_count <= scsi_in(sc)->length))
877 scsi_in(sc)->resid = res_count;
878 else
879 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
880 }
881
7207fea4
BH		 882 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
883 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 884 int res_count = be32_to_cpu(rhdr->residual_count);
885
7207fea4
BH		 886 if (res_count > 0 &&
887 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
888 res_count <= scsi_bufflen(sc)))
c07d4444 889 /* write side for bidi or uni-io set_resid */
1c138991 890 scsi_set_resid(sc, res_count);
7996a778
MC		 891 else
892 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
c07d4444 893 }
7996a778 894out:
3bbaaad9 895 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
1b2c7af8 896 sc, sc->result, task->itt);
7996a778 897 conn->scsirsp_pdus_cnt++;
b3cd5050 898 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 899}
900
1d9edf02
MC		 901/**
902 * iscsi_data_in_rsp - SCSI Data-In Response processing
903 * @conn: iscsi connection
904 * @hdr: iscsi pdu
905 * @task: scsi command task
906 **/
907static void
908iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
909 struct iscsi_task *task)
910{
911 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
912 struct scsi_cmnd *sc = task->sc;
913
914 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
915 return;
916
edbc9aa0 917 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
1d9edf02
MC		 918 sc->result = (DID_OK << 16) | rhdr->cmd_status;
919 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
920 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
921 ISCSI_FLAG_DATA_OVERFLOW)) {
922 int res_count = be32_to_cpu(rhdr->residual_count);
923
924 if (res_count > 0 &&
925 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
926 res_count <= scsi_in(sc)->length))
927 scsi_in(sc)->resid = res_count;
928 else
929 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
930 }
931
3bbaaad9
MC		 932 ISCSI_DBG_SESSION(conn->session, "data in with status done "
933 "[sc %p res %d itt 0x%x]\n",
934 sc, sc->result, task->itt);
1d9edf02 935 conn->scsirsp_pdus_cnt++;
b3cd5050 936 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1d9edf02
MC		 937}
938
7ea8b828
MC		 939static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
940{
941 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
942
943 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
944 conn->tmfrsp_pdus_cnt++;
945
843c0a8a 946 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 947 return;
948
949 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 950 conn->tmf_state = TMF_SUCCESS;
7ea8b828 951 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 952 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 953 else
843c0a8a 954 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 955 wake_up(&conn->ehwait);
956}
957
f6d5180c
MC		 958static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
959{
960 struct iscsi_nopout hdr;
9c19a7d0 961 struct iscsi_task *task;
f6d5180c 962
9c19a7d0 963 if (!rhdr && conn->ping_task)
f6d5180c
MC		 964 return;
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) {
971 memcpy(hdr.lun, rhdr->lun, 8);
972 hdr.ttt = rhdr->ttt;
973 hdr.itt = RESERVED_ITT;
974 } else
975 hdr.ttt = RESERVED_ITT;
976
9c19a7d0
MC		 977 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
978 if (!task)
322d739d 979 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
d3acf022
MC		 980 else if (!rhdr) {
981 /* only track our nops */
982 conn->ping_task = task;
983 conn->last_ping = jiffies;
984 }
f6d5180c
MC		 985}
986
8afa1439
MC		 987static int iscsi_nop_out_rsp(struct iscsi_task *task,
988 struct iscsi_nopin *nop, char *data, int datalen)
989{
990 struct iscsi_conn *conn = task->conn;
991 int rc = 0;
992
993 if (conn->ping_task != task) {
994 /*
995 * If this is not in response to one of our
996 * nops then it must be from userspace.
997 */
998 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
999 data, datalen))
1000 rc = ISCSI_ERR_CONN_FAILED;
1001 } else
1002 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1003 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1004 return rc;
1005}
1006
62f38300
MC		 1007static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1008 char *data, int datalen)
1009{
1010 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1011 struct iscsi_hdr rejected_pdu;
8afa1439 1012 int opcode, rc = 0;
62f38300
MC		 1013
1014 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1015
8afa1439
MC		 1016 if (ntoh24(reject->dlength) > datalen ||
1017 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1018 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1019 "pdu. Invalid data length (pdu dlength "
1020 "%u, datalen %d\n", ntoh24(reject->dlength),
1021 datalen);
1022 return ISCSI_ERR_PROTO;
1023 }
1024 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1025 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1026
1027 switch (reject->reason) {
1028 case ISCSI_REASON_DATA_DIGEST_ERROR:
1029 iscsi_conn_printk(KERN_ERR, conn,
1030 "pdu (op 0x%x itt 0x%x) rejected "
1031 "due to DataDigest error.\n",
1032 rejected_pdu.itt, opcode);
1033 break;
1034 case ISCSI_REASON_IMM_CMD_REJECT:
1035 iscsi_conn_printk(KERN_ERR, conn,
1036 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1037 "immediate commands.\n",
1038 rejected_pdu.itt, opcode);
1039 /*
1040 * We only send one TMF at a time so if the target could not
1041 * handle it, then it should get fixed (RFC mandates that
1042 * a target can handle one immediate TMF per conn).
1043 *
1044 * For nops-outs, we could have sent more than one if
1045 * the target is sending us lots of nop-ins
1046 */
1047 if (opcode != ISCSI_OP_NOOP_OUT)
1048 return 0;
62f38300 1049
8afa1439
MC		 1050 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG))
1051 /*
1052 * nop-out in response to target's nop-out rejected.
1053 * Just resend.
1054 */
1055 iscsi_send_nopout(conn,
1056 (struct iscsi_nopin*)&rejected_pdu);
1057 else {
1058 struct iscsi_task *task;
1059 /*
1060 * Our nop as ping got dropped. We know the target
1061 * and transport are ok so just clean up
1062 */
1063 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1064 if (!task) {
1065 iscsi_conn_printk(KERN_ERR, conn,
1066 "Invalid pdu reject. Could "
1067 "not lookup rejected task.\n");
1068 rc = ISCSI_ERR_BAD_ITT;
1069 } else
1070 rc = iscsi_nop_out_rsp(task,
1071 (struct iscsi_nopin*)&rejected_pdu,
1072 NULL, 0);
62f38300 1073 }
8afa1439
MC		 1074 break;
1075 default:
1076 iscsi_conn_printk(KERN_ERR, conn,
1077 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1078 "code 0x%x\n", rejected_pdu.itt,
1079 rejected_pdu.opcode, reject->reason);
1080 break;
62f38300 1081 }
8afa1439 1082 return rc;
62f38300
MC		 1083}
1084
913e5bf4
MC		 1085/**
1086 * iscsi_itt_to_task - look up task by itt
1087 * @conn: iscsi connection
1088 * @itt: itt
1089 *
1090 * This should be used for mgmt tasks like login and nops, or if
1091 * the LDD's itt space does not include the session age.
1092 *
1093 * The session lock must be held.
1094 */
8f9256ce 1095struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
913e5bf4
MC		 1096{
1097 struct iscsi_session *session = conn->session;
262ef636 1098 int i;
913e5bf4
MC		 1099
1100 if (itt == RESERVED_ITT)
1101 return NULL;
1102
262ef636
MC		 1103 if (session->tt->parse_pdu_itt)
1104 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1105 else
1106 i = get_itt(itt);
913e5bf4
MC		 1107 if (i >= session->cmds_max)
1108 return NULL;
1109
1110 return session->cmds[i];
1111}
8f9256ce 1112EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
913e5bf4 1113
7996a778
MC		 1114/**
1115 * __iscsi_complete_pdu - complete pdu
1116 * @conn: iscsi conn
1117 * @hdr: iscsi header
1118 * @data: data buffer
1119 * @datalen: len of data buffer
1120 *
1121 * Completes pdu processing by freeing any resources allocated at
1122 * queuecommand or send generic. session lock must be held and verify
1123 * itt must have been called.
1124 */
913e5bf4
MC		 1125int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1126 char *data, int datalen)
7996a778
MC		 1127{
1128 struct iscsi_session *session = conn->session;
1129 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
9c19a7d0 1130 struct iscsi_task *task;
7996a778
MC		 1131 uint32_t itt;
1132
f6d5180c 1133 conn->last_recv = jiffies;
0af967f5
MC		 1134 rc = iscsi_verify_itt(conn, hdr->itt);
1135 if (rc)
1136 return rc;
1137
b4377356
AV		 1138 if (hdr->itt != RESERVED_ITT)
1139 itt = get_itt(hdr->itt);
7996a778 1140 else
b4377356 1141 itt = ~0U;
7996a778 1142
1b2c7af8
MC		 1143 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1144 opcode, conn->id, itt, datalen);
7996a778 1145
3e5c28ad 1146 if (itt == ~0U) {
77a23c21 1147 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 1148
7996a778
MC		 1149 switch(opcode) {
1150 case ISCSI_OP_NOOP_IN:
40527afe 1151 if (datalen) {
7996a778 1152 rc = ISCSI_ERR_PROTO;
40527afe
MC		 1153 break;
1154 }
1155
b4377356 1156 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 1157 break;
1158
f6d5180c 1159 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 1160 break;
1161 case ISCSI_OP_REJECT:
62f38300
MC		 1162 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1163 break;
7996a778 1164 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 1165 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 1166 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1167 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 1168 break;
1169 default:
1170 rc = ISCSI_ERR_BAD_OPCODE;
1171 break;
1172 }
3e5c28ad
MC		 1173 goto out;
1174 }
1175
3e5c28ad
MC		 1176 switch(opcode) {
1177 case ISCSI_OP_SCSI_CMD_RSP:
913e5bf4
MC		 1178 case ISCSI_OP_SCSI_DATA_IN:
1179 task = iscsi_itt_to_ctask(conn, hdr->itt);
1180 if (!task)
1181 return ISCSI_ERR_BAD_ITT;
d355e57d 1182 task->last_xfer = jiffies;
913e5bf4
MC		 1183 break;
1184 case ISCSI_OP_R2T:
1185 /*
1186 * LLD handles R2Ts if they need to.
1187 */
1188 return 0;
1189 case ISCSI_OP_LOGOUT_RSP:
1190 case ISCSI_OP_LOGIN_RSP:
1191 case ISCSI_OP_TEXT_RSP:
1192 case ISCSI_OP_SCSI_TMFUNC_RSP:
1193 case ISCSI_OP_NOOP_IN:
1194 task = iscsi_itt_to_task(conn, hdr->itt);
1195 if (!task)
1196 return ISCSI_ERR_BAD_ITT;
1197 break;
1198 default:
1199 return ISCSI_ERR_BAD_OPCODE;
1200 }
1201
1202 switch(opcode) {
1203 case ISCSI_OP_SCSI_CMD_RSP:
9c19a7d0 1204 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
3e5c28ad
MC		 1205 break;
1206 case ISCSI_OP_SCSI_DATA_IN:
1d9edf02 1207 iscsi_data_in_rsp(conn, hdr, task);
3e5c28ad 1208 break;
3e5c28ad
MC		 1209 case ISCSI_OP_LOGOUT_RSP:
1210 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1211 if (datalen) {
1212 rc = ISCSI_ERR_PROTO;
1213 break;
1214 }
1215 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1216 goto recv_pdu;
1217 case ISCSI_OP_LOGIN_RSP:
1218 case ISCSI_OP_TEXT_RSP:
1219 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1220 /*
1221 * login related PDU's exp_statsn is handled in
1222 * userspace
1223 */
1224 goto recv_pdu;
1225 case ISCSI_OP_SCSI_TMFUNC_RSP:
1226 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1227 if (datalen) {
1228 rc = ISCSI_ERR_PROTO;
1229 break;
1230 }
1231
1232 iscsi_tmf_rsp(conn, hdr);
b3cd5050 1233 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
3e5c28ad
MC		 1234 break;
1235 case ISCSI_OP_NOOP_IN:
1236 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1237 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1238 rc = ISCSI_ERR_PROTO;
1239 break;
1240 }
1241 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1242
8afa1439
MC		 1243 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1244 data, datalen);
3e5c28ad
MC		 1245 break;
1246 default:
1247 rc = ISCSI_ERR_BAD_OPCODE;
1248 break;
1249 }
7996a778 1250
3e5c28ad
MC		 1251out:
1252 return rc;
1253recv_pdu:
1254 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1255 rc = ISCSI_ERR_CONN_FAILED;
b3cd5050 1256 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
7996a778
MC		 1257 return rc;
1258}
913e5bf4 1259EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
7996a778
MC		 1260
1261int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1262 char *data, int datalen)
1263{
1264 int rc;
1265
1266 spin_lock(&conn->session->lock);
1267 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1268 spin_unlock(&conn->session->lock);
1269 return rc;
1270}
1271EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1272
0af967f5 1273int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
7996a778
MC		 1274{
1275 struct iscsi_session *session = conn->session;
262ef636 1276 int age = 0, i = 0;
7996a778 1277
0af967f5
MC		 1278 if (itt == RESERVED_ITT)
1279 return 0;
7996a778 1280
262ef636
MC		 1281 if (session->tt->parse_pdu_itt)
1282 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1283 else {
1284 i = get_itt(itt);
1285 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1286 }
1287
1288 if (age != session->age) {
0af967f5
MC		 1289 iscsi_conn_printk(KERN_ERR, conn,
1290 "received itt %x expected session age (%x)\n",
913e5bf4 1291 (__force u32)itt, session->age);
0af967f5
MC		 1292 return ISCSI_ERR_BAD_ITT;
1293 }
7996a778 1294
3e5c28ad
MC		 1295 if (i >= session->cmds_max) {
1296 iscsi_conn_printk(KERN_ERR, conn,
1297 "received invalid itt index %u (max cmds "
1298 "%u.\n", i, session->cmds_max);
1299 return ISCSI_ERR_BAD_ITT;
7996a778 1300 }
7996a778
MC		 1301 return 0;
1302}
1303EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1304
913e5bf4
MC		 1305/**
1306 * iscsi_itt_to_ctask - look up ctask by itt
1307 * @conn: iscsi connection
1308 * @itt: itt
1309 *
1310 * This should be used for cmd tasks.
1311 *
1312 * The session lock must be held.
1313 */
1314struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
0af967f5 1315{
9c19a7d0 1316 struct iscsi_task *task;
0af967f5
MC		 1317
1318 if (iscsi_verify_itt(conn, itt))
1319 return NULL;
1320
913e5bf4
MC		 1321 task = iscsi_itt_to_task(conn, itt);
1322 if (!task || !task->sc)
0af967f5
MC		 1323 return NULL;
1324
913e5bf4
MC		 1325 if (task->sc->SCp.phase != conn->session->age) {
1326 iscsi_session_printk(KERN_ERR, conn->session,
1327 "task's session age %d, expected %d\n",
1328 task->sc->SCp.phase, conn->session->age);
0af967f5 1329 return NULL;
913e5bf4 1330 }
0af967f5 1331
9c19a7d0 1332 return task;
0af967f5
MC		 1333}
1334EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1335
40a06e75 1336void iscsi_session_failure(struct iscsi_session *session,
e5bd7b54
MC		 1337 enum iscsi_err err)
1338{
e5bd7b54
MC		 1339 struct iscsi_conn *conn;
1340 struct device *dev;
e5bd7b54 1341
bfcf72e4 1342 spin_lock_bh(&session->lock);
e5bd7b54
MC		 1343 conn = session->leadconn;
1344 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
bfcf72e4 1345 spin_unlock_bh(&session->lock);
e5bd7b54
MC		 1346 return;
1347 }
1348
1349 dev = get_device(&conn->cls_conn->dev);
bfcf72e4 1350 spin_unlock_bh(&session->lock);
e5bd7b54
MC		 1351 if (!dev)
1352 return;
1353 /*
1354 * if the host is being removed bypass the connection
1355 * recovery initialization because we are going to kill
1356 * the session.
1357 */
1358 if (err == ISCSI_ERR_INVALID_HOST)
1359 iscsi_conn_error_event(conn->cls_conn, err);
1360 else
1361 iscsi_conn_failure(conn, err);
1362 put_device(dev);
1363}
1364EXPORT_SYMBOL_GPL(iscsi_session_failure);
1365
7996a778
MC		 1366void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1367{
1368 struct iscsi_session *session = conn->session;
7996a778 1369
bfcf72e4 1370 spin_lock_bh(&session->lock);
656cffc9 1371 if (session->state == ISCSI_STATE_FAILED) {
bfcf72e4 1372 spin_unlock_bh(&session->lock);
656cffc9
MC		 1373 return;
1374 }
1375
67a61114 1376 if (conn->stop_stage == 0)
7996a778 1377 session->state = ISCSI_STATE_FAILED;
bfcf72e4 1378 spin_unlock_bh(&session->lock);
e5bd7b54 1379
7996a778
MC		 1380 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1381 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
e5bd7b54 1382 iscsi_conn_error_event(conn->cls_conn, err);
7996a778
MC		 1383}
1384EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1385
77a23c21
MC		 1386static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1387{
1388 struct iscsi_session *session = conn->session;
1389
1390 /*
1391 * Check for iSCSI window and take care of CmdSN wrap-around
1392 */
e0726407 1393 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1b2c7af8
MC		 1394 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1395 "%u MaxCmdSN %u CmdSN %u/%u\n",
1396 session->exp_cmdsn, session->max_cmdsn,
1397 session->cmdsn, session->queued_cmdsn);
77a23c21
MC		 1398 return -ENOSPC;
1399 }
1400 return 0;
1401}
1402
9c19a7d0 1403static int iscsi_xmit_task(struct iscsi_conn *conn)
77a23c21 1404{
9c19a7d0 1405 struct iscsi_task *task = conn->task;
843c0a8a 1406 int rc;
77a23c21 1407
70b31c15
MC		 1408 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx))
1409 return -ENODATA;
1410
9c19a7d0 1411 __iscsi_get_task(task);
77a23c21 1412 spin_unlock_bh(&conn->session->lock);
9c19a7d0 1413 rc = conn->session->tt->xmit_task(task);
77a23c21 1414 spin_lock_bh(&conn->session->lock);
d355e57d 1415 if (!rc) {
9c19a7d0 1416 /* done with this task */
d355e57d 1417 task->last_xfer = jiffies;
9c19a7d0 1418 conn->task = NULL;
d355e57d
MC		 1419 }
1420 __iscsi_put_task(task);
77a23c21
MC		 1421 return rc;
1422}
1423
843c0a8a 1424/**
9c19a7d0
MC		 1425 * iscsi_requeue_task - requeue task to run from session workqueue
1426 * @task: task to requeue
843c0a8a 1427 *
9c19a7d0 1428 * LLDs that need to run a task from the session workqueue should call
052d0144
MC		 1429 * this. The session lock must be held. This should only be called
1430 * by software drivers.
843c0a8a 1431 */
9c19a7d0 1432void iscsi_requeue_task(struct iscsi_task *task)
843c0a8a 1433{
9c19a7d0 1434 struct iscsi_conn *conn = task->conn;
843c0a8a 1435
3bbaaad9
MC		 1436 /*
1437 * this may be on the requeue list already if the xmit_task callout
1438 * is handling the r2ts while we are adding new ones
1439 */
1440 if (list_empty(&task->running))
1441 list_add_tail(&task->running, &conn->requeue);
32ae763e 1442 iscsi_conn_queue_work(conn);
843c0a8a 1443}
9c19a7d0 1444EXPORT_SYMBOL_GPL(iscsi_requeue_task);
843c0a8a 1445
7996a778
MC		 1446/**
1447 * iscsi_data_xmit - xmit any command into the scheduled connection
1448 * @conn: iscsi connection
1449 *
1450 * Notes:
1451 * The function can return -EAGAIN in which case the caller must
1452 * re-schedule it again later or recover. '0' return code means
1453 * successful xmit.
1454 **/
1455static int iscsi_data_xmit(struct iscsi_conn *conn)
1456{
5d12c05e 1457 struct iscsi_task *task;
3219e529 1458 int rc = 0;
7996a778 1459
77a23c21 1460 spin_lock_bh(&conn->session->lock);
70b31c15 1461 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1b2c7af8 1462 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
77a23c21 1463 spin_unlock_bh(&conn->session->lock);
3219e529 1464 return -ENODATA;
7996a778 1465 }
7996a778 1466
9c19a7d0
MC		 1467 if (conn->task) {
1468 rc = iscsi_xmit_task(conn);
3219e529 1469 if (rc)
70b31c15 1470 goto done;
7996a778
MC		 1471 }
1472
77a23c21
MC		 1473 /*
1474 * process mgmt pdus like nops before commands since we should
1475 * only have one nop-out as a ping from us and targets should not
1476 * overflow us with nop-ins
1477 */
1478check_mgmt:
843c0a8a 1479 while (!list_empty(&conn->mgmtqueue)) {
9c19a7d0
MC		 1480 conn->task = list_entry(conn->mgmtqueue.next,
1481 struct iscsi_task, running);
3bbaaad9 1482 list_del_init(&conn->task->running);
9c19a7d0
MC		 1483 if (iscsi_prep_mgmt_task(conn, conn->task)) {
1484 __iscsi_put_task(conn->task);
1485 conn->task = NULL;
b3a7ea8d
MC		 1486 continue;
1487 }
9c19a7d0 1488 rc = iscsi_xmit_task(conn);
77a23c21 1489 if (rc)
70b31c15 1490 goto done;
7996a778
MC		 1491 }
1492
843c0a8a 1493 /* process pending command queue */
3bbaaad9 1494 while (!list_empty(&conn->cmdqueue)) {
5d12c05e
MC		 1495 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1496 running);
3bbaaad9 1497 list_del_init(&conn->task->running);
b3a7ea8d 1498 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
b3cd5050 1499 fail_scsi_task(conn->task, DID_IMM_RETRY);
b3a7ea8d
MC		 1500 continue;
1501 }
577577da
MC		 1502 rc = iscsi_prep_scsi_cmd_pdu(conn->task);
1503 if (rc) {
5d12c05e 1504 if (rc == -ENOMEM || rc == -EACCES) {
3bbaaad9
MC		 1505 list_add_tail(&conn->task->running,
1506 &conn->cmdqueue);
577577da 1507 conn->task = NULL;
70b31c15 1508 goto done;
577577da 1509 } else
b3cd5050 1510 fail_scsi_task(conn->task, DID_ABORT);
004d6530
BH		 1511 continue;
1512 }
9c19a7d0 1513 rc = iscsi_xmit_task(conn);
77a23c21 1514 if (rc)
70b31c15 1515 goto done;
77a23c21 1516 /*
9c19a7d0 1517 * we could continuously get new task requests so
77a23c21
MC		 1518 * we need to check the mgmt queue for nops that need to
1519 * be sent to aviod starvation
1520 */
843c0a8a
MC		 1521 if (!list_empty(&conn->mgmtqueue))
1522 goto check_mgmt;
1523 }
1524
1525 while (!list_empty(&conn->requeue)) {
b3a7ea8d
MC		 1526 /*
1527 * we always do fastlogout - conn stop code will clean up.
1528 */
1529 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1530 break;
1531
5d12c05e
MC		 1532 task = list_entry(conn->requeue.next, struct iscsi_task,
1533 running);
1534 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1535 break;
1536
1537 conn->task = task;
3bbaaad9 1538 list_del_init(&conn->task->running);
9c19a7d0 1539 conn->task->state = ISCSI_TASK_RUNNING;
9c19a7d0 1540 rc = iscsi_xmit_task(conn);
843c0a8a 1541 if (rc)
70b31c15 1542 goto done;
843c0a8a 1543 if (!list_empty(&conn->mgmtqueue))
77a23c21 1544 goto check_mgmt;
7996a778 1545 }
b6c395ed 1546 spin_unlock_bh(&conn->session->lock);
3219e529 1547 return -ENODATA;
7996a778 1548
70b31c15 1549done:
77a23c21 1550 spin_unlock_bh(&conn->session->lock);
3219e529 1551 return rc;
7996a778
MC		 1552}
1553
c4028958 1554static void iscsi_xmitworker(struct work_struct *work)
7996a778 1555{
c4028958
DH		 1556 struct iscsi_conn *conn =
1557 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1558 int rc;
7996a778
MC		 1559 /*
1560 * serialize Xmit worker on a per-connection basis.
1561 */
3219e529
MC		 1562 do {
1563 rc = iscsi_data_xmit(conn);
1564 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1565}
1566
577577da
MC		 1567static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1568 struct scsi_cmnd *sc)
1569{
1570 struct iscsi_task *task;
1571
7acd72eb 1572 if (!kfifo_out(&conn->session->cmdpool.queue,
577577da
MC		 1573 (void *) &task, sizeof(void *)))
1574 return NULL;
1575
1576 sc->SCp.phase = conn->session->age;
1577 sc->SCp.ptr = (char *) task;
1578
1579 atomic_set(&task->refcount, 1);
1580 task->state = ISCSI_TASK_PENDING;
1581 task->conn = conn;
1582 task->sc = sc;
d355e57d
MC		 1583 task->have_checked_conn = false;
1584 task->last_timeout = jiffies;
1585 task->last_xfer = jiffies;
577577da
MC		 1586 INIT_LIST_HEAD(&task->running);
1587 return task;
1588}
1589
7996a778
MC		 1590enum {
1591 FAILURE_BAD_HOST = 1,
1592 FAILURE_SESSION_FAILED,
1593 FAILURE_SESSION_FREED,
1594 FAILURE_WINDOW_CLOSED,
60ecebf5 1595 FAILURE_OOM,
7996a778 1596 FAILURE_SESSION_TERMINATE,
656cffc9 1597 FAILURE_SESSION_IN_RECOVERY,
7996a778 1598 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1599 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1600 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1601};
1602
f41d4721 1603int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
7996a778 1604{
75613521 1605 struct iscsi_cls_session *cls_session;
1336aed1 1606 struct iscsi_host *ihost;
7996a778
MC		 1607 int reason = 0;
1608 struct iscsi_session *session;
1609 struct iscsi_conn *conn;
9c19a7d0 1610 struct iscsi_task *task = NULL;
7996a778 1611
7996a778 1612 sc->result = 0;
f47f2cf5 1613 sc->SCp.ptr = NULL;
7996a778 1614
1336aed1 1615 ihost = shost_priv(host);
7996a778 1616
75613521
MC		 1617 cls_session = starget_to_session(scsi_target(sc->device));
1618 session = cls_session->dd_data;
f41d4721 1619 spin_lock_bh(&session->lock);
7996a778 1620
75613521 1621 reason = iscsi_session_chkready(cls_session);
6eabafbe
MC		 1622 if (reason) {
1623 sc->result = reason;
1624 goto fault;
1625 }
1626
301e0f7e 1627 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9
MC		 1628 /*
1629 * to handle the race between when we set the recovery state
1630 * and block the session we requeue here (commands could
1631 * be entering our queuecommand while a block is starting
1632 * up because the block code is not locked)
1633 */
9000bcd6 1634 switch (session->state) {
301e0f7e 1635 case ISCSI_STATE_FAILED:
9000bcd6 1636 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1637 reason = FAILURE_SESSION_IN_RECOVERY;
301e0f7e
MC		 1638 sc->result = DID_IMM_RETRY << 16;
1639 break;
9000bcd6
MC		 1640 case ISCSI_STATE_LOGGING_OUT:
1641 reason = FAILURE_SESSION_LOGGING_OUT;
301e0f7e
MC		 1642 sc->result = DID_IMM_RETRY << 16;
1643 break;
b3a7ea8d 1644 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1645 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
56d7fcfa 1646 sc->result = DID_TRANSPORT_FAILFAST << 16;
b3a7ea8d
MC		 1647 break;
1648 case ISCSI_STATE_TERMINATE:
656cffc9 1649 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1650 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1651 break;
b3a7ea8d 1652 default:
656cffc9 1653 reason = FAILURE_SESSION_FREED;
6eabafbe 1654 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1655 }
7996a778
MC		 1656 goto fault;
1657 }
1658
7996a778 1659 conn = session->leadconn;
98644047
MC		 1660 if (!conn) {
1661 reason = FAILURE_SESSION_FREED;
6eabafbe 1662 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1663 goto fault;
1664 }
7996a778 1665
661134ad
MC		 1666 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
1667 reason = FAILURE_SESSION_IN_RECOVERY;
1668 sc->result = DID_REQUEUE;
1669 goto fault;
1670 }
1671
77a23c21
MC		 1672 if (iscsi_check_cmdsn_window_closed(conn)) {
1673 reason = FAILURE_WINDOW_CLOSED;
1674 goto reject;
1675 }
1676
577577da
MC		 1677 task = iscsi_alloc_task(conn, sc);
1678 if (!task) {
60ecebf5
MC		 1679 reason = FAILURE_OOM;
1680 goto reject;
1681 }
7996a778 1682
1336aed1 1683 if (!ihost->workq) {
577577da
MC		 1684 reason = iscsi_prep_scsi_cmd_pdu(task);
1685 if (reason) {
5d12c05e 1686 if (reason == -ENOMEM || reason == -EACCES) {
577577da
MC		 1687 reason = FAILURE_OOM;
1688 goto prepd_reject;
1689 } else {
1690 sc->result = DID_ABORT << 16;
1691 goto prepd_fault;
1692 }
052d0144 1693 }
9c19a7d0 1694 if (session->tt->xmit_task(task)) {
d3305f34 1695 session->cmdsn--;
052d0144 1696 reason = FAILURE_SESSION_NOT_READY;
577577da 1697 goto prepd_reject;
052d0144 1698 }
3bbaaad9
MC		 1699 } else {
1700 list_add_tail(&task->running, &conn->cmdqueue);
32ae763e 1701 iscsi_conn_queue_work(conn);
3bbaaad9 1702 }
052d0144
MC		 1703
1704 session->queued_cmdsn++;
f41d4721 1705 spin_unlock_bh(&session->lock);
7996a778
MC		 1706 return 0;
1707
577577da 1708prepd_reject:
f41d4721 1709 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1710reject:
f41d4721 1711 spin_unlock_bh(&session->lock);
1b2c7af8
MC		 1712 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1713 sc->cmnd[0], reason);
d6d13ee1 1714 return SCSI_MLQUEUE_TARGET_BUSY;
7996a778 1715
577577da 1716prepd_fault:
f41d4721 1717 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
7996a778 1718fault:
f41d4721 1719 spin_unlock_bh(&session->lock);
1b2c7af8
MC		 1720 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1721 sc->cmnd[0], reason);
c07d4444
BH		 1722 if (!scsi_bidi_cmnd(sc))
1723 scsi_set_resid(sc, scsi_bufflen(sc));
1724 else {
1725 scsi_out(sc)->resid = scsi_out(sc)->length;
1726 scsi_in(sc)->resid = scsi_in(sc)->length;
1727 }
f41d4721 1728 sc->scsi_done(sc);
7996a778
MC		 1729 return 0;
1730}
1731EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1732
e881a172 1733int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
7996a778 1734{
1796e722
MC		 1735 switch (reason) {
1736 case SCSI_QDEPTH_DEFAULT:
1737 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1738 break;
1739 case SCSI_QDEPTH_QFULL:
1740 scsi_track_queue_full(sdev, depth);
1741 break;
1742 case SCSI_QDEPTH_RAMP_UP:
1743 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1744 break;
1745 default:
e881a172 1746 return -EOPNOTSUPP;
1796e722 1747 }
7996a778
MC		 1748 return sdev->queue_depth;
1749}
1750EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1751
6b5d6c44
MC		 1752int iscsi_target_alloc(struct scsi_target *starget)
1753{
1754 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1755 struct iscsi_session *session = cls_session->dd_data;
1756
1757 starget->can_queue = session->scsi_cmds_max;
1758 return 0;
1759}
1760EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1761
843c0a8a 1762static void iscsi_tmf_timedout(unsigned long data)
7996a778 1763{
843c0a8a 1764 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1765 struct iscsi_session *session = conn->session;
1766
1767 spin_lock(&session->lock);
843c0a8a
MC		 1768 if (conn->tmf_state == TMF_QUEUED) {
1769 conn->tmf_state = TMF_TIMEDOUT;
bd2199d4 1770 ISCSI_DBG_EH(session, "tmf timedout\n");
7996a778
MC		 1771 /* unblock eh_abort() */
1772 wake_up(&conn->ehwait);
1773 }
1774 spin_unlock(&session->lock);
1775}
1776
9c19a7d0 1777static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1778 struct iscsi_tm *hdr, int age,
1779 int timeout)
7996a778 1780{
7996a778 1781 struct iscsi_session *session = conn->session;
9c19a7d0 1782 struct iscsi_task *task;
7996a778 1783
9c19a7d0 1784 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
843c0a8a 1785 NULL, 0);
9c19a7d0 1786 if (!task) {
6724add1 1787 spin_unlock_bh(&session->lock);
df4da5cd 1788 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
7996a778 1789 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a 1790 spin_lock_bh(&session->lock);
77a23c21 1791 return -EPERM;
7996a778 1792 }
843c0a8a 1793 conn->tmfcmd_pdus_cnt++;
f6d5180c 1794 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1795 conn->tmf_timer.function = iscsi_tmf_timedout;
1796 conn->tmf_timer.data = (unsigned long)conn;
1797 add_timer(&conn->tmf_timer);
bd2199d4 1798 ISCSI_DBG_EH(session, "tmf set timeout\n");
7996a778 1799
7996a778 1800 spin_unlock_bh(&session->lock);
6724add1 1801 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1802
1803 /*
1804 * block eh thread until:
1805 *
843c0a8a
MC		 1806 * 1) tmf response
1807 * 2) tmf timeout
7996a778
MC		 1808 * 3) session is terminated or restarted or userspace has
1809 * given up on recovery
1810 */
843c0a8a 1811 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1812 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1813 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1814 if (signal_pending(current))
1815 flush_signals(current);
843c0a8a
MC		 1816 del_timer_sync(&conn->tmf_timer);
1817
6724add1 1818 mutex_lock(&session->eh_mutex);
77a23c21 1819 spin_lock_bh(&session->lock);
9c19a7d0 1820 /* if the session drops it will clean up the task */
843c0a8a
MC		 1821 if (age != session->age ||
1822 session->state != ISCSI_STATE_LOGGED_IN)
1823 return -ENOTCONN;
7996a778
MC		 1824 return 0;
1825}
1826
843c0a8a
MC		 1827/*
1828 * Fail commands. session lock held and recv side suspended and xmit
1829 * thread flushed
1830 */
3bbaaad9
MC		 1831static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun,
1832 int error)
843c0a8a 1833{
3bbaaad9
MC		 1834 struct iscsi_task *task;
1835 int i;
843c0a8a 1836
3bbaaad9
MC		 1837 for (i = 0; i < conn->session->cmds_max; i++) {
1838 task = conn->session->cmds[i];
1839 if (!task->sc || task->state == ISCSI_TASK_FREE)
1840 continue;
843c0a8a 1841
3bbaaad9
MC		 1842 if (lun != -1 && lun != task->sc->device->lun)
1843 continue;
843c0a8a 1844
3bbaaad9
MC		 1845 ISCSI_DBG_SESSION(conn->session,
1846 "failing sc %p itt 0x%x state %d\n",
1847 task->sc, task->itt, task->state);
b3cd5050 1848 fail_scsi_task(task, error);
843c0a8a
MC		 1849 }
1850}
1851
661134ad
MC		 1852/**
1853 * iscsi_suspend_queue - suspend iscsi_queuecommand
1854 * @conn: iscsi conn to stop queueing IO on
1855 *
1856 * This grabs the session lock to make sure no one is in
1857 * xmit_task/queuecommand, and then sets suspend to prevent
1858 * new commands from being queued. This only needs to be called
1859 * by offload drivers that need to sync a path like ep disconnect
1860 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
1861 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
1862 */
1863void iscsi_suspend_queue(struct iscsi_conn *conn)
1864{
1865 spin_lock_bh(&conn->session->lock);
1866 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1867 spin_unlock_bh(&conn->session->lock);
1868}
1869EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
1870
1871/**
1872 * iscsi_suspend_tx - suspend iscsi_data_xmit
1873 * @conn: iscsi conn tp stop processing IO on.
1874 *
1875 * This function sets the suspend bit to prevent iscsi_data_xmit
1876 * from sending new IO, and if work is queued on the xmit thread
1877 * it will wait for it to be completed.
1878 */
b40977d9 1879void iscsi_suspend_tx(struct iscsi_conn *conn)
6724add1 1880{
32ae763e
MC		 1881 struct Scsi_Host *shost = conn->session->host;
1882 struct iscsi_host *ihost = shost_priv(shost);
1883
6724add1 1884 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1885 if (ihost->workq)
32ae763e 1886 flush_workqueue(ihost->workq);
6724add1 1887}
b40977d9 1888EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
6724add1
MC		 1889
1890static void iscsi_start_tx(struct iscsi_conn *conn)
1891{
1892 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1336aed1 1893 iscsi_conn_queue_work(conn);
6724add1
MC		 1894}
1895
4c48a829
MC		 1896/*
1897 * We want to make sure a ping is in flight. It has timed out.
1898 * And we are not busy processing a pdu that is making
1899 * progress but got started before the ping and is taking a while
1900 * to complete so the ping is just stuck behind it in a queue.
1901 */
1902static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
1903{
1904 if (conn->ping_task &&
1905 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1906 (conn->ping_timeout * HZ), jiffies))
1907 return 1;
1908 else
1909 return 0;
1910}
1911
d355e57d 1912static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
f6d5180c 1913{
d355e57d 1914 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED;
92ed4d69 1915 struct iscsi_task *task = NULL, *running_task;
f6d5180c
MC		 1916 struct iscsi_cls_session *cls_session;
1917 struct iscsi_session *session;
1918 struct iscsi_conn *conn;
92ed4d69 1919 int i;
f6d5180c 1920
d355e57d 1921 cls_session = starget_to_session(scsi_target(sc->device));
75613521 1922 session = cls_session->dd_data;
f6d5180c 1923
bd2199d4 1924 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
f6d5180c
MC		 1925
1926 spin_lock(&session->lock);
1927 if (session->state != ISCSI_STATE_LOGGED_IN) {
1928 /*
1929 * We are probably in the middle of iscsi recovery so let
1930 * that complete and handle the error.
1931 */
242f9dcb 1932 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1933 goto done;
1934 }
1935
1936 conn = session->leadconn;
1937 if (!conn) {
1938 /* In the middle of shuting down */
242f9dcb 1939 rc = BLK_EH_RESET_TIMER;
f6d5180c
MC		 1940 goto done;
1941 }
1942
d355e57d 1943 task = (struct iscsi_task *)sc->SCp.ptr;
92ed4d69
MC		 1944 if (!task) {
1945 /*
1946 * Raced with completion. Just reset timer, and let it
1947 * complete normally
1948 */
1949 rc = BLK_EH_RESET_TIMER;
d355e57d 1950 goto done;
92ed4d69
MC		 1951 }
1952
d355e57d
MC		 1953 /*
1954 * If we have sent (at least queued to the network layer) a pdu or
1955 * recvd one for the task since the last timeout ask for
1956 * more time. If on the next timeout we have not made progress
1957 * we can check if it is the task or connection when we send the
1958 * nop as a ping.
1959 */
92ed4d69 1960 if (time_after(task->last_xfer, task->last_timeout)) {
bd2199d4
EZ		 1961 ISCSI_DBG_EH(session, "Command making progress. Asking "
1962 "scsi-ml for more time to complete. "
92ed4d69 1963 "Last data xfer at %lu. Last timeout was at "
bd2199d4 1964 "%lu\n.", task->last_xfer, task->last_timeout);
d355e57d
MC		 1965 task->have_checked_conn = false;
1966 rc = BLK_EH_RESET_TIMER;
1967 goto done;
1968 }
1969
f6d5180c
MC		 1970 if (!conn->recv_timeout && !conn->ping_timeout)
1971 goto done;
1972 /*
1973 * if the ping timedout then we are in the middle of cleaning up
1974 * and can let the iscsi eh handle it
1975 */
4c48a829 1976 if (iscsi_has_ping_timed_out(conn)) {
242f9dcb 1977 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 1978 goto done;
1979 }
d355e57d 1980
92ed4d69
MC		 1981 for (i = 0; i < conn->session->cmds_max; i++) {
1982 running_task = conn->session->cmds[i];
1983 if (!running_task->sc || running_task == task ||
1984 running_task->state != ISCSI_TASK_RUNNING)
1985 continue;
1986
1987 /*
1988 * Only check if cmds started before this one have made
1989 * progress, or this could never fail
1990 */
1991 if (time_after(running_task->sc->jiffies_at_alloc,
1992 task->sc->jiffies_at_alloc))
1993 continue;
1994
1995 if (time_after(running_task->last_xfer, task->last_timeout)) {
1996 /*
1997 * This task has not made progress, but a task
1998 * started before us has transferred data since
1999 * we started/last-checked. We could be queueing
2000 * too many tasks or the LU is bad.
2001 *
2002 * If the device is bad the cmds ahead of us on
2003 * other devs will complete, and this loop will
2004 * eventually fail starting the scsi eh.
2005 */
2006 ISCSI_DBG_EH(session, "Command has not made progress "
2007 "but commands ahead of it have. "
2008 "Asking scsi-ml for more time to "
2009 "complete. Our last xfer vs running task "
2010 "last xfer %lu/%lu. Last check %lu.\n",
2011 task->last_xfer, running_task->last_xfer,
2012 task->last_timeout);
2013 rc = BLK_EH_RESET_TIMER;
2014 goto done;
2015 }
2016 }
2017
d355e57d
MC		 2018 /* Assumes nop timeout is shorter than scsi cmd timeout */
2019 if (task->have_checked_conn)
2020 goto done;
2021
f6d5180c 2022 /*
d355e57d
MC		 2023 * Checking the transport already or nop from a cmd timeout still
2024 * running
f6d5180c 2025 */
d355e57d
MC		 2026 if (conn->ping_task) {
2027 task->have_checked_conn = true;
242f9dcb 2028 rc = BLK_EH_RESET_TIMER;
4c48a829
MC		 2029 goto done;
2030 }
2031
d355e57d
MC		 2032 /* Make sure there is a transport check done */
2033 iscsi_send_nopout(conn, NULL);
2034 task->have_checked_conn = true;
2035 rc = BLK_EH_RESET_TIMER;
2036
f6d5180c 2037done:
d355e57d
MC		 2038 if (task)
2039 task->last_timeout = jiffies;
f6d5180c 2040 spin_unlock(&session->lock);
bd2199d4
EZ		 2041 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ?
2042 "timer reset" : "nh");
f6d5180c
MC		 2043 return rc;
2044}
2045
2046static void iscsi_check_transport_timeouts(unsigned long data)
2047{
2048 struct iscsi_conn *conn = (struct iscsi_conn *)data;
2049 struct iscsi_session *session = conn->session;
4cf10435 2050 unsigned long recv_timeout, next_timeout = 0, last_recv;
f6d5180c
MC		 2051
2052 spin_lock(&session->lock);
2053 if (session->state != ISCSI_STATE_LOGGED_IN)
2054 goto done;
2055
4cf10435
MC		 2056 recv_timeout = conn->recv_timeout;
2057 if (!recv_timeout)
f6d5180c
MC		 2058 goto done;
2059
4cf10435 2060 recv_timeout *= HZ;
f6d5180c 2061 last_recv = conn->last_recv;
4c48a829
MC		 2062
2063 if (iscsi_has_ping_timed_out(conn)) {
322d739d 2064 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
4c48a829
MC		 2065 "expired, recv timeout %d, last rx %lu, "
2066 "last ping %lu, now %lu\n",
2067 conn->ping_timeout, conn->recv_timeout,
2068 last_recv, conn->last_ping, jiffies);
f6d5180c
MC		 2069 spin_unlock(&session->lock);
2070 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
2071 return;
2072 }
2073
4cf10435 2074 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
c8611f97 2075 /* send a ping to try to provoke some traffic */
1b2c7af8 2076 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
c8611f97 2077 iscsi_send_nopout(conn, NULL);
4cf10435 2078 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
ad294e9c 2079 } else
4cf10435 2080 next_timeout = last_recv + recv_timeout;
f6d5180c 2081
1b2c7af8 2082 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
ad294e9c 2083 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 2084done:
2085 spin_unlock(&session->lock);
2086}
2087
9c19a7d0 2088static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
843c0a8a
MC		 2089 struct iscsi_tm *hdr)
2090{
2091 memset(hdr, 0, sizeof(*hdr));
2092 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2093 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2094 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
577577da
MC		 2095 memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
2096 hdr->rtt = task->hdr_itt;
2097 hdr->refcmdsn = task->cmdsn;
843c0a8a
MC		 2098}
2099
7996a778
MC		 2100int iscsi_eh_abort(struct scsi_cmnd *sc)
2101{
75613521
MC		 2102 struct iscsi_cls_session *cls_session;
2103 struct iscsi_session *session;
f47f2cf5 2104 struct iscsi_conn *conn;
9c19a7d0 2105 struct iscsi_task *task;
843c0a8a
MC		 2106 struct iscsi_tm *hdr;
2107 int rc, age;
7996a778 2108
75613521
MC		 2109 cls_session = starget_to_session(scsi_target(sc->device));
2110 session = cls_session->dd_data;
2111
bd2199d4 2112 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
4421c9eb 2113
6724add1
MC		 2114 mutex_lock(&session->eh_mutex);
2115 spin_lock_bh(&session->lock);
f47f2cf5
MC		 2116 /*
2117 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2118 * got the command.
2119 */
2120 if (!sc->SCp.ptr) {
bd2199d4
EZ		 2121 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2122 "it completed.\n");
6724add1
MC		 2123 spin_unlock_bh(&session->lock);
2124 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 2125 return SUCCESS;
2126 }
2127
7996a778
MC		 2128 /*
2129 * If we are not logged in or we have started a new session
2130 * then let the host reset code handle this
2131 */
843c0a8a
MC		 2132 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2133 sc->SCp.phase != session->age) {
2134 spin_unlock_bh(&session->lock);
2135 mutex_unlock(&session->eh_mutex);
bd2199d4 2136 ISCSI_DBG_EH(session, "failing abort due to dropped "
4421c9eb 2137 "session.\n");
843c0a8a
MC		 2138 return FAILED;
2139 }
2140
2141 conn = session->leadconn;
2142 conn->eh_abort_cnt++;
2143 age = session->age;
2144
9c19a7d0 2145 task = (struct iscsi_task *)sc->SCp.ptr;
bd2199d4
EZ		 2146 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n",
2147 sc, task->itt);
7996a778 2148
9c19a7d0
MC		 2149 /* task completed before time out */
2150 if (!task->sc) {
bd2199d4 2151 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
77a23c21 2152 goto success;
7ea8b828 2153 }
7996a778 2154
9c19a7d0 2155 if (task->state == ISCSI_TASK_PENDING) {
b3cd5050 2156 fail_scsi_task(task, DID_ABORT);
77a23c21
MC		 2157 goto success;
2158 }
7996a778 2159
843c0a8a
MC		 2160 /* only have one tmf outstanding at a time */
2161 if (conn->tmf_state != TMF_INITIAL)
7996a778 2162 goto failed;
843c0a8a 2163 conn->tmf_state = TMF_QUEUED;
7996a778 2164
843c0a8a 2165 hdr = &conn->tmhdr;
9c19a7d0 2166 iscsi_prep_abort_task_pdu(task, hdr);
843c0a8a 2167
9c19a7d0 2168 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 2169 rc = FAILED;
2170 goto failed;
2171 }
2172
2173 switch (conn->tmf_state) {
2174 case TMF_SUCCESS:
77a23c21 2175 spin_unlock_bh(&session->lock);
913e5bf4
MC		 2176 /*
2177 * stop tx side incase the target had sent a abort rsp but
2178 * the initiator was still writing out data.
2179 */
6724add1 2180 iscsi_suspend_tx(conn);
77a23c21 2181 /*
913e5bf4
MC		 2182 * we do not stop the recv side because targets have been
2183 * good and have never sent us a successful tmf response
2184 * then sent more data for the cmd.
77a23c21 2185 */
6187c242 2186 spin_lock_bh(&session->lock);
b3cd5050 2187 fail_scsi_task(task, DID_ABORT);
843c0a8a 2188 conn->tmf_state = TMF_INITIAL;
5d12c05e 2189 memset(hdr, 0, sizeof(*hdr));
6187c242 2190 spin_unlock_bh(&session->lock);
6724add1 2191 iscsi_start_tx(conn);
77a23c21 2192 goto success_unlocked;
843c0a8a
MC		 2193 case TMF_TIMEDOUT:
2194 spin_unlock_bh(&session->lock);
df4da5cd 2195 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2196 goto failed_unlocked;
2197 case TMF_NOT_FOUND:
2198 if (!sc->SCp.ptr) {
2199 conn->tmf_state = TMF_INITIAL;
5d12c05e 2200 memset(hdr, 0, sizeof(*hdr));
9c19a7d0 2201 /* task completed before tmf abort response */
bd2199d4
EZ		 2202 ISCSI_DBG_EH(session, "sc completed while abort in "
2203 "progress\n");
77a23c21 2204 goto success;
7ea8b828
MC		 2205 }
2206 /* fall through */
2207 default:
843c0a8a
MC		 2208 conn->tmf_state = TMF_INITIAL;
2209 goto failed;
7996a778
MC		 2210 }
2211
77a23c21 2212success:
7996a778 2213 spin_unlock_bh(&session->lock);
77a23c21 2214success_unlocked:
bd2199d4
EZ		 2215 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2216 sc, task->itt);
6724add1 2217 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2218 return SUCCESS;
2219
2220failed:
2221 spin_unlock_bh(&session->lock);
77a23c21 2222failed_unlocked:
bd2199d4
EZ		 2223 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2224 task ? task->itt : 0);
6724add1 2225 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2226 return FAILED;
2227}
2228EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2229
843c0a8a
MC		 2230static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2231{
2232 memset(hdr, 0, sizeof(*hdr));
2233 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2234 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2235 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2236 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 2237 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 2238}
2239
2240int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2241{
75613521
MC		 2242 struct iscsi_cls_session *cls_session;
2243 struct iscsi_session *session;
843c0a8a
MC		 2244 struct iscsi_conn *conn;
2245 struct iscsi_tm *hdr;
2246 int rc = FAILED;
2247
75613521
MC		 2248 cls_session = starget_to_session(scsi_target(sc->device));
2249 session = cls_session->dd_data;
2250
bd2199d4 2251 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
843c0a8a
MC		 2252
2253 mutex_lock(&session->eh_mutex);
2254 spin_lock_bh(&session->lock);
2255 /*
2256 * Just check if we are not logged in. We cannot check for
2257 * the phase because the reset could come from a ioctl.
2258 */
2259 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2260 goto unlock;
2261 conn = session->leadconn;
2262
2263 /* only have one tmf outstanding at a time */
2264 if (conn->tmf_state != TMF_INITIAL)
2265 goto unlock;
2266 conn->tmf_state = TMF_QUEUED;
2267
2268 hdr = &conn->tmhdr;
2269 iscsi_prep_lun_reset_pdu(sc, hdr);
2270
9c19a7d0 2271 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
f6d5180c 2272 session->lu_reset_timeout)) {
843c0a8a
MC		 2273 rc = FAILED;
2274 goto unlock;
2275 }
2276
2277 switch (conn->tmf_state) {
2278 case TMF_SUCCESS:
2279 break;
2280 case TMF_TIMEDOUT:
2281 spin_unlock_bh(&session->lock);
df4da5cd 2282 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
843c0a8a
MC		 2283 goto done;
2284 default:
2285 conn->tmf_state = TMF_INITIAL;
2286 goto unlock;
2287 }
2288
2289 rc = SUCCESS;
2290 spin_unlock_bh(&session->lock);
2291
2292 iscsi_suspend_tx(conn);
913e5bf4 2293
a3439148 2294 spin_lock_bh(&session->lock);
5d12c05e 2295 memset(hdr, 0, sizeof(*hdr));
3bbaaad9 2296 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
843c0a8a 2297 conn->tmf_state = TMF_INITIAL;
a3439148 2298 spin_unlock_bh(&session->lock);
843c0a8a
MC		 2299
2300 iscsi_start_tx(conn);
2301 goto done;
2302
2303unlock:
2304 spin_unlock_bh(&session->lock);
2305done:
bd2199d4
EZ		 2306 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2307 rc == SUCCESS ? "SUCCESS" : "FAILED");
843c0a8a
MC		 2308 mutex_unlock(&session->eh_mutex);
2309 return rc;
2310}
2311EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2312
3fe5ae8b
MC		 2313void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2314{
2315 struct iscsi_session *session = cls_session->dd_data;
2316
2317 spin_lock_bh(&session->lock);
2318 if (session->state != ISCSI_STATE_LOGGED_IN) {
2319 session->state = ISCSI_STATE_RECOVERY_FAILED;
2320 if (session->leadconn)
2321 wake_up(&session->leadconn->ehwait);
2322 }
2323 spin_unlock_bh(&session->lock);
2324}
2325EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2326
2327/**
2328 * iscsi_eh_session_reset - drop session and attempt relogin
2329 * @sc: scsi command
2330 *
2331 * This function will wait for a relogin, session termination from
2332 * userspace, or a recovery/replacement timeout.
2333 */
309ce156 2334int iscsi_eh_session_reset(struct scsi_cmnd *sc)
3fe5ae8b
MC		 2335{
2336 struct iscsi_cls_session *cls_session;
2337 struct iscsi_session *session;
2338 struct iscsi_conn *conn;
2339
2340 cls_session = starget_to_session(scsi_target(sc->device));
2341 session = cls_session->dd_data;
2342 conn = session->leadconn;
2343
2344 mutex_lock(&session->eh_mutex);
2345 spin_lock_bh(&session->lock);
2346 if (session->state == ISCSI_STATE_TERMINATE) {
2347failed:
2348 ISCSI_DBG_EH(session,
2349 "failing session reset: Could not log back into "
2350 "%s, %s [age %d]\n", session->targetname,
2351 conn->persistent_address, session->age);
2352 spin_unlock_bh(&session->lock);
2353 mutex_unlock(&session->eh_mutex);
2354 return FAILED;
2355 }
2356
2357 spin_unlock_bh(&session->lock);
2358 mutex_unlock(&session->eh_mutex);
2359 /*
2360 * we drop the lock here but the leadconn cannot be destoyed while
2361 * we are in the scsi eh
2362 */
df4da5cd 2363 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2364
2365 ISCSI_DBG_EH(session, "wait for relogin\n");
2366 wait_event_interruptible(conn->ehwait,
2367 session->state == ISCSI_STATE_TERMINATE ||
2368 session->state == ISCSI_STATE_LOGGED_IN ||
2369 session->state == ISCSI_STATE_RECOVERY_FAILED);
2370 if (signal_pending(current))
2371 flush_signals(current);
2372
2373 mutex_lock(&session->eh_mutex);
2374 spin_lock_bh(&session->lock);
2375 if (session->state == ISCSI_STATE_LOGGED_IN) {
2376 ISCSI_DBG_EH(session,
2377 "session reset succeeded for %s,%s\n",
2378 session->targetname, conn->persistent_address);
2379 } else
2380 goto failed;
2381 spin_unlock_bh(&session->lock);
2382 mutex_unlock(&session->eh_mutex);
2383 return SUCCESS;
2384}
309ce156 2385EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
3fe5ae8b
MC		 2386
2387static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2388{
2389 memset(hdr, 0, sizeof(*hdr));
2390 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2391 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2392 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2393 hdr->rtt = RESERVED_ITT;
2394}
2395
2396/**
2397 * iscsi_eh_target_reset - reset target
2398 * @sc: scsi command
2399 *
309ce156 2400 * This will attempt to send a warm target reset.
3fe5ae8b
MC		 2401 */
2402int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2403{
2404 struct iscsi_cls_session *cls_session;
2405 struct iscsi_session *session;
2406 struct iscsi_conn *conn;
2407 struct iscsi_tm *hdr;
2408 int rc = FAILED;
2409
2410 cls_session = starget_to_session(scsi_target(sc->device));
2411 session = cls_session->dd_data;
2412
2413 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2414 session->targetname);
2415
2416 mutex_lock(&session->eh_mutex);
2417 spin_lock_bh(&session->lock);
2418 /*
2419 * Just check if we are not logged in. We cannot check for
2420 * the phase because the reset could come from a ioctl.
2421 */
2422 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2423 goto unlock;
2424 conn = session->leadconn;
2425
2426 /* only have one tmf outstanding at a time */
2427 if (conn->tmf_state != TMF_INITIAL)
2428 goto unlock;
2429 conn->tmf_state = TMF_QUEUED;
2430
2431 hdr = &conn->tmhdr;
2432 iscsi_prep_tgt_reset_pdu(sc, hdr);
2433
2434 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2435 session->tgt_reset_timeout)) {
2436 rc = FAILED;
2437 goto unlock;
2438 }
2439
2440 switch (conn->tmf_state) {
2441 case TMF_SUCCESS:
2442 break;
2443 case TMF_TIMEDOUT:
2444 spin_unlock_bh(&session->lock);
df4da5cd 2445 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
3fe5ae8b
MC		 2446 goto done;
2447 default:
2448 conn->tmf_state = TMF_INITIAL;
2449 goto unlock;
2450 }
2451
2452 rc = SUCCESS;
2453 spin_unlock_bh(&session->lock);
2454
2455 iscsi_suspend_tx(conn);
2456
2457 spin_lock_bh(&session->lock);
2458 memset(hdr, 0, sizeof(*hdr));
2459 fail_scsi_tasks(conn, -1, DID_ERROR);
2460 conn->tmf_state = TMF_INITIAL;
2461 spin_unlock_bh(&session->lock);
2462
2463 iscsi_start_tx(conn);
2464 goto done;
2465
2466unlock:
2467 spin_unlock_bh(&session->lock);
2468done:
2469 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2470 rc == SUCCESS ? "SUCCESS" : "FAILED");
2471 mutex_unlock(&session->eh_mutex);
309ce156
JK		 2472 return rc;
2473}
2474EXPORT_SYMBOL_GPL(iscsi_eh_target_reset);
3fe5ae8b 2475
309ce156
JK		 2476/**
2477 * iscsi_eh_recover_target - reset target and possibly the session
2478 * @sc: scsi command
2479 *
2480 * This will attempt to send a warm target reset. If that fails,
2481 * we will escalate to ERL0 session recovery.
2482 */
2483int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2484{
2485 int rc;
2486
2487 rc = iscsi_eh_target_reset(sc);
3fe5ae8b
MC		 2488 if (rc == FAILED)
2489 rc = iscsi_eh_session_reset(sc);
2490 return rc;
2491}
309ce156 2492EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
3fe5ae8b 2493
6320377f
OK		 2494/*
2495 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2496 * should be accessed via kfifo_{get,put} on q->queue.
2497 * Optionally, the caller can obtain the array of object pointers
2498 * by passing in a non-NULL @items pointer
2499 */
7996a778 2500int
6320377f 2501iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 2502{
6320377f 2503 int i, num_arrays = 1;
7996a778 2504
6320377f 2505 memset(q, 0, sizeof(*q));
7996a778
MC		 2506
2507 q->max = max;
6320377f
OK		 2508
2509 /* If the user passed an items pointer, he wants a copy of
2510 * the array. */
2511 if (items)
2512 num_arrays++;
2513 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
2514 if (q->pool == NULL)
f474a37b 2515 return -ENOMEM;
7996a778 2516
c1e13f25 2517 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
7996a778
MC		 2518
2519 for (i = 0; i < max; i++) {
6320377f 2520 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 2521 if (q->pool[i] == NULL) {
6320377f
OK		 2522 q->max = i;
2523 goto enomem;
7996a778 2524 }
7acd72eb 2525 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
7996a778 2526 }
6320377f
OK		 2527
2528 if (items) {
2529 *items = q->pool + max;
2530 memcpy(*items, q->pool, max * sizeof(void *));
2531 }
2532
7996a778 2533 return 0;
6320377f
OK		 2534
2535enomem:
2536 iscsi_pool_free(q);
2537 return -ENOMEM;
7996a778
MC		 2538}
2539EXPORT_SYMBOL_GPL(iscsi_pool_init);
2540
6320377f 2541void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 2542{
2543 int i;
2544
2545 for (i = 0; i < q->max; i++)
6320377f 2546 kfree(q->pool[i]);
f474a37b 2547 kfree(q->pool);
7996a778
MC		 2548}
2549EXPORT_SYMBOL_GPL(iscsi_pool_free);
2550
a4804cd6
MC		 2551/**
2552 * iscsi_host_add - add host to system
2553 * @shost: scsi host
2554 * @pdev: parent device
2555 *
2556 * This should be called by partial offload and software iscsi drivers
2557 * to add a host to the system.
2558 */
2559int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2560{
8e9a20ce
MC		 2561 if (!shost->can_queue)
2562 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2563
4d108350
MC		 2564 if (!shost->cmd_per_lun)
2565 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2566
308cec14
MC		 2567 if (!shost->transportt->eh_timed_out)
2568 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
a4804cd6
MC		 2569 return scsi_add_host(shost, pdev);
2570}
2571EXPORT_SYMBOL_GPL(iscsi_host_add);
2572
2573/**
2574 * iscsi_host_alloc - allocate a host and driver data
2575 * @sht: scsi host template
2576 * @dd_data_size: driver host data size
32ae763e 2577 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
a4804cd6
MC		 2578 *
2579 * This should be called by partial offload and software iscsi drivers.
2580 * To access the driver specific memory use the iscsi_host_priv() macro.
2581 */
2582struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
4d108350 2583 int dd_data_size, bool xmit_can_sleep)
75613521 2584{
a4804cd6 2585 struct Scsi_Host *shost;
e5bd7b54 2586 struct iscsi_host *ihost;
a4804cd6
MC		 2587
2588 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2589 if (!shost)
2590 return NULL;
e5bd7b54 2591 ihost = shost_priv(shost);
32ae763e
MC		 2592
2593 if (xmit_can_sleep) {
2594 snprintf(ihost->workq_name, sizeof(ihost->workq_name),
2595 "iscsi_q_%d", shost->host_no);
2596 ihost->workq = create_singlethread_workqueue(ihost->workq_name);
2597 if (!ihost->workq)
2598 goto free_host;
2599 }
2600
e5bd7b54
MC		 2601 spin_lock_init(&ihost->lock);
2602 ihost->state = ISCSI_HOST_SETUP;
2603 ihost->num_sessions = 0;
2604 init_waitqueue_head(&ihost->session_removal_wq);
a4804cd6 2605 return shost;
32ae763e
MC		 2606
2607free_host:
2608 scsi_host_put(shost);
2609 return NULL;
a4804cd6
MC		 2610}
2611EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2612
e5bd7b54
MC		 2613static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2614{
40a06e75 2615 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
e5bd7b54
MC		 2616}
2617
a4804cd6
MC		 2618/**
2619 * iscsi_host_remove - remove host and sessions
2620 * @shost: scsi host
2621 *
e5bd7b54
MC		 2622 * If there are any sessions left, this will initiate the removal and wait
2623 * for the completion.
a4804cd6
MC		 2624 */
2625void iscsi_host_remove(struct Scsi_Host *shost)
2626{
e5bd7b54
MC		 2627 struct iscsi_host *ihost = shost_priv(shost);
2628 unsigned long flags;
2629
2630 spin_lock_irqsave(&ihost->lock, flags);
2631 ihost->state = ISCSI_HOST_REMOVED;
2632 spin_unlock_irqrestore(&ihost->lock, flags);
2633
2634 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2635 wait_event_interruptible(ihost->session_removal_wq,
2636 ihost->num_sessions == 0);
2637 if (signal_pending(current))
2638 flush_signals(current);
2639
a4804cd6 2640 scsi_remove_host(shost);
32ae763e
MC		 2641 if (ihost->workq)
2642 destroy_workqueue(ihost->workq);
75613521 2643}
a4804cd6 2644EXPORT_SYMBOL_GPL(iscsi_host_remove);
7996a778 2645
a4804cd6 2646void iscsi_host_free(struct Scsi_Host *shost)
75613521
MC		 2647{
2648 struct iscsi_host *ihost = shost_priv(shost);
7996a778 2649
75613521
MC		 2650 kfree(ihost->netdev);
2651 kfree(ihost->hwaddress);
2652 kfree(ihost->initiatorname);
a4804cd6 2653 scsi_host_put(shost);
75613521 2654}
a4804cd6 2655EXPORT_SYMBOL_GPL(iscsi_host_free);
7996a778 2656
e5bd7b54
MC		 2657static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2658{
2659 struct iscsi_host *ihost = shost_priv(shost);
2660 unsigned long flags;
2661
2662 shost = scsi_host_get(shost);
2663 if (!shost) {
2664 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2665 "of session teardown event because host already "
2666 "removed.\n");
2667 return;
2668 }
2669
2670 spin_lock_irqsave(&ihost->lock, flags);
2671 ihost->num_sessions--;
2672 if (ihost->num_sessions == 0)
2673 wake_up(&ihost->session_removal_wq);
2674 spin_unlock_irqrestore(&ihost->lock, flags);
2675 scsi_host_put(shost);
2676}
2677
7996a778
MC		 2678/**
2679 * iscsi_session_setup - create iscsi cls session and host and session
7996a778 2680 * @iscsit: iscsi transport template
75613521
MC		 2681 * @shost: scsi host
2682 * @cmds_max: session can queue
9c19a7d0 2683 * @cmd_task_size: LLD task private data size
7996a778 2684 * @initial_cmdsn: initial CmdSN
7996a778
MC		 2685 *
2686 * This can be used by software iscsi_transports that allocate
2687 * a session per scsi host.
3cf7b233
MC		 2688 *
2689 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of
2690 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
2691 * for nop handling and login/logout requests.
75613521 2692 */
7996a778 2693struct iscsi_cls_session *
75613521 2694iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
b8b9e1b8 2695 uint16_t cmds_max, int dd_size, int cmd_task_size,
7970634b 2696 uint32_t initial_cmdsn, unsigned int id)
7996a778 2697{
e5bd7b54 2698 struct iscsi_host *ihost = shost_priv(shost);
7996a778
MC		 2699 struct iscsi_session *session;
2700 struct iscsi_cls_session *cls_session;
3cf7b233 2701 int cmd_i, scsi_cmds, total_cmds = cmds_max;
e5bd7b54
MC		 2702 unsigned long flags;
2703
2704 spin_lock_irqsave(&ihost->lock, flags);
2705 if (ihost->state == ISCSI_HOST_REMOVED) {
2706 spin_unlock_irqrestore(&ihost->lock, flags);
2707 return NULL;
2708 }
2709 ihost->num_sessions++;
2710 spin_unlock_irqrestore(&ihost->lock, flags);
8e9a20ce
MC		 2711
2712 if (!total_cmds)
2713 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
3e5c28ad 2714 /*
3cf7b233
MC		 2715 * The iscsi layer needs some tasks for nop handling and tmfs,
2716 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2717 * + 1 command for scsi IO.
3e5c28ad 2718 */
3cf7b233
MC		 2719 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2720 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2721 "must be a power of two that is at least %d.\n",
2722 total_cmds, ISCSI_TOTAL_CMDS_MIN);
e5bd7b54 2723 goto dec_session_count;
3cf7b233
MC		 2724 }
2725
2726 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2727 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2728 "must be a power of 2 less than or equal to %d.\n",
2729 cmds_max, ISCSI_TOTAL_CMDS_MAX);
2730 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2731 }
2732
2733 if (!is_power_of_2(total_cmds)) {
2734 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue "
2735 "must be a power of 2.\n", total_cmds);
2736 total_cmds = rounddown_pow_of_two(total_cmds);
2737 if (total_cmds < ISCSI_TOTAL_CMDS_MIN)
2738 return NULL;
2739 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n",
2740 total_cmds);
1548271e 2741 }
3cf7b233 2742 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
1548271e 2743
5d91e209 2744 cls_session = iscsi_alloc_session(shost, iscsit,
b8b9e1b8
JK		 2745 sizeof(struct iscsi_session) +
2746 dd_size);
75613521 2747 if (!cls_session)
e5bd7b54 2748 goto dec_session_count;
75613521
MC		 2749 session = cls_session->dd_data;
2750 session->cls_session = cls_session;
7996a778
MC		 2751 session->host = shost;
2752 session->state = ISCSI_STATE_FREE;
f6d5180c 2753 session->fast_abort = 1;
3fe5ae8b 2754 session->tgt_reset_timeout = 30;
4cd49ea1
MC		 2755 session->lu_reset_timeout = 15;
2756 session->abort_timeout = 10;
3cf7b233
MC		 2757 session->scsi_cmds_max = scsi_cmds;
2758 session->cmds_max = total_cmds;
e0726407 2759 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 2760 session->exp_cmdsn = initial_cmdsn + 1;
2761 session->max_cmdsn = initial_cmdsn + 1;
2762 session->max_r2t = 1;
2763 session->tt = iscsit;
b8b9e1b8 2764 session->dd_data = cls_session->dd_data + sizeof(*session);
6724add1 2765 mutex_init(&session->eh_mutex);
75613521 2766 spin_lock_init(&session->lock);
7996a778
MC		 2767
2768 /* initialize SCSI PDU commands pool */
2769 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
2770 (void***)&session->cmds,
9c19a7d0 2771 cmd_task_size + sizeof(struct iscsi_task)))
7996a778
MC		 2772 goto cmdpool_alloc_fail;
2773
2774 /* pre-format cmds pool with ITT */
2775 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
9c19a7d0 2776 struct iscsi_task *task = session->cmds[cmd_i];
7996a778 2777
9c19a7d0
MC		 2778 if (cmd_task_size)
2779 task->dd_data = &task[1];
2780 task->itt = cmd_i;
3bbaaad9 2781 task->state = ISCSI_TASK_FREE;
9c19a7d0 2782 INIT_LIST_HEAD(&task->running);
7996a778
MC		 2783 }
2784
f53a88da 2785 if (!try_module_get(iscsit->owner))
75613521 2786 goto module_get_fail;
7996a778 2787
7970634b 2788 if (iscsi_add_session(cls_session, id))
75613521 2789 goto cls_session_fail;
e5bd7b54 2790
7996a778
MC		 2791 return cls_session;
2792
2793cls_session_fail:
75613521
MC		 2794 module_put(iscsit->owner);
2795module_get_fail:
6320377f 2796 iscsi_pool_free(&session->cmdpool);
7996a778 2797cmdpool_alloc_fail:
75613521 2798 iscsi_free_session(cls_session);
e5bd7b54
MC		 2799dec_session_count:
2800 iscsi_host_dec_session_cnt(shost);
7996a778
MC		 2801 return NULL;
2802}
2803EXPORT_SYMBOL_GPL(iscsi_session_setup);
2804
2805/**
2806 * iscsi_session_teardown - destroy session, host, and cls_session
75613521 2807 * @cls_session: iscsi session
7996a778 2808 *
75613521
MC		 2809 * The driver must have called iscsi_remove_session before
2810 * calling this.
2811 */
7996a778
MC		 2812void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
2813{
75613521 2814 struct iscsi_session *session = cls_session->dd_data;
63f75cc8 2815 struct module *owner = cls_session->transport->owner;
e5bd7b54 2816 struct Scsi_Host *shost = session->host;
7996a778 2817
6320377f 2818 iscsi_pool_free(&session->cmdpool);
7996a778 2819
b2c64167
MC		 2820 kfree(session->password);
2821 kfree(session->password_in);
2822 kfree(session->username);
2823 kfree(session->username_in);
f3ff0c36 2824 kfree(session->targetname);
88dfd340
MC		 2825 kfree(session->initiatorname);
2826 kfree(session->ifacename);
f3ff0c36 2827
75613521 2828 iscsi_destroy_session(cls_session);
e5bd7b54 2829 iscsi_host_dec_session_cnt(shost);
63f75cc8 2830 module_put(owner);
7996a778
MC		 2831}
2832EXPORT_SYMBOL_GPL(iscsi_session_teardown);
2833
2834/**
2835 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
2836 * @cls_session: iscsi_cls_session
5d91e209 2837 * @dd_size: private driver data size
7996a778 2838 * @conn_idx: cid
5d91e209 2839 */
7996a778 2840struct iscsi_cls_conn *
5d91e209
MC		 2841iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
2842 uint32_t conn_idx)
7996a778 2843{
75613521 2844 struct iscsi_session *session = cls_session->dd_data;
7996a778
MC		 2845 struct iscsi_conn *conn;
2846 struct iscsi_cls_conn *cls_conn;
d36ab6f3 2847 char *data;
7996a778 2848
5d91e209
MC		 2849 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size,
2850 conn_idx);
7996a778
MC		 2851 if (!cls_conn)
2852 return NULL;
2853 conn = cls_conn->dd_data;
5d91e209 2854 memset(conn, 0, sizeof(*conn) + dd_size);
7996a778 2855
5d91e209 2856 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
7996a778
MC		 2857 conn->session = session;
2858 conn->cls_conn = cls_conn;
2859 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
2860 conn->id = conn_idx;
2861 conn->exp_statsn = 0;
843c0a8a 2862 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 2863
2864 init_timer(&conn->transport_timer);
2865 conn->transport_timer.data = (unsigned long)conn;
2866 conn->transport_timer.function = iscsi_check_transport_timeouts;
2867
843c0a8a 2868 INIT_LIST_HEAD(&conn->mgmtqueue);
3bbaaad9 2869 INIT_LIST_HEAD(&conn->cmdqueue);
843c0a8a 2870 INIT_LIST_HEAD(&conn->requeue);
c4028958 2871 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778 2872
9c19a7d0 2873 /* allocate login_task used for the login/text sequences */
7996a778 2874 spin_lock_bh(&session->lock);
7acd72eb 2875 if (!kfifo_out(&session->cmdpool.queue,
9c19a7d0 2876 (void*)&conn->login_task,
7996a778
MC		 2877 sizeof(void*))) {
2878 spin_unlock_bh(&session->lock);
9c19a7d0 2879 goto login_task_alloc_fail;
7996a778
MC		 2880 }
2881 spin_unlock_bh(&session->lock);
2882
cfeb2cf9
MC		 2883 data = (char *) __get_free_pages(GFP_KERNEL,
2884 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
d36ab6f3 2885 if (!data)
9c19a7d0
MC		 2886 goto login_task_data_alloc_fail;
2887 conn->login_task->data = conn->data = data;
d36ab6f3 2888
843c0a8a 2889 init_timer(&conn->tmf_timer);
7996a778
MC		 2890 init_waitqueue_head(&conn->ehwait);
2891
2892 return cls_conn;
2893
9c19a7d0 2894login_task_data_alloc_fail:
7acd72eb 2895 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
d36ab6f3 2896 sizeof(void*));
9c19a7d0 2897login_task_alloc_fail:
7996a778
MC		 2898 iscsi_destroy_conn(cls_conn);
2899 return NULL;
2900}
2901EXPORT_SYMBOL_GPL(iscsi_conn_setup);
2902
2903/**
2904 * iscsi_conn_teardown - teardown iscsi connection
2905 * cls_conn: iscsi class connection
2906 *
2907 * TODO: we may need to make this into a two step process
2908 * like scsi-mls remove + put host
2909 */
2910void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
2911{
2912 struct iscsi_conn *conn = cls_conn->dd_data;
2913 struct iscsi_session *session = conn->session;
2914 unsigned long flags;
2915
f6d5180c
MC		 2916 del_timer_sync(&conn->transport_timer);
2917
7996a778
MC		 2918 spin_lock_bh(&session->lock);
2919 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
2920 if (session->leadconn == conn) {
2921 /*
2922 * leading connection? then give up on recovery.
2923 */
2924 session->state = ISCSI_STATE_TERMINATE;
2925 wake_up(&conn->ehwait);
2926 }
2927 spin_unlock_bh(&session->lock);
2928
7996a778
MC		 2929 /*
2930 * Block until all in-progress commands for this connection
2931 * time out or fail.
2932 */
2933 for (;;) {
2934 spin_lock_irqsave(session->host->host_lock, flags);
2935 if (!session->host->host_busy) { /* OK for ERL == 0 */
2936 spin_unlock_irqrestore(session->host->host_lock, flags);
2937 break;
2938 }
2939 spin_unlock_irqrestore(session->host->host_lock, flags);
2940 msleep_interruptible(500);
322d739d
MC		 2941 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2942 "host_busy %d host_failed %d\n",
2943 session->host->host_busy,
2944 session->host->host_failed);
7996a778
MC		 2945 /*
2946 * force eh_abort() to unblock
2947 */
2948 wake_up(&conn->ehwait);
2949 }
2950
779ea120 2951 /* flush queued up work because we free the connection below */
843c0a8a 2952 iscsi_suspend_tx(conn);
779ea120 2953
7996a778 2954 spin_lock_bh(&session->lock);
cfeb2cf9
MC		 2955 free_pages((unsigned long) conn->data,
2956 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
f3ff0c36 2957 kfree(conn->persistent_address);
7acd72eb 2958 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
7996a778 2959 sizeof(void*));
e0726407 2960 if (session->leadconn == conn)
7996a778 2961 session->leadconn = NULL;
7996a778
MC		 2962 spin_unlock_bh(&session->lock);
2963
7996a778
MC		 2964 iscsi_destroy_conn(cls_conn);
2965}
2966EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2967
2968int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2969{
2970 struct iscsi_conn *conn = cls_conn->dd_data;
2971 struct iscsi_session *session = conn->session;
2972
ffd0436e 2973 if (!session) {
322d739d
MC		 2974 iscsi_conn_printk(KERN_ERR, conn,
2975 "can't start unbound connection\n");
7996a778
MC		 2976 return -EPERM;
2977 }
2978
db98ccde
MC		 2979 if ((session->imm_data_en || !session->initial_r2t_en) &&
2980 session->first_burst > session->max_burst) {
322d739d
MC		 2981 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2982 "first_burst %d max_burst %d\n",
2983 session->first_burst, session->max_burst);
ffd0436e
MC		 2984 return -EINVAL;
2985 }
2986
f6d5180c 2987 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2988 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2989 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2990 conn->recv_timeout = 5;
2991 }
2992
2993 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2994 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2995 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2996 conn->ping_timeout = 5;
2997 }
2998
7996a778
MC		 2999 spin_lock_bh(&session->lock);
3000 conn->c_stage = ISCSI_CONN_STARTED;
3001 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 3002 session->queued_cmdsn = session->cmdsn;
7996a778 3003
f6d5180c
MC		 3004 conn->last_recv = jiffies;
3005 conn->last_ping = jiffies;
3006 if (conn->recv_timeout && conn->ping_timeout)
3007 mod_timer(&conn->transport_timer,
3008 jiffies + (conn->recv_timeout * HZ));
3009
7996a778
MC		 3010 switch(conn->stop_stage) {
3011 case STOP_CONN_RECOVER:
3012 /*
3013 * unblock eh_abort() if it is blocked. re-try all
3014 * commands after successful recovery
3015 */
7996a778 3016 conn->stop_stage = 0;
843c0a8a 3017 conn->tmf_state = TMF_INITIAL;
7996a778 3018 session->age++;
8b1d0343
MC		 3019 if (session->age == 16)
3020 session->age = 0;
6eabafbe 3021 break;
7996a778 3022 case STOP_CONN_TERM:
7996a778 3023 conn->stop_stage = 0;
7996a778
MC		 3024 break;
3025 default:
3026 break;
3027 }
3028 spin_unlock_bh(&session->lock);
3029
75613521 3030 iscsi_unblock_session(session->cls_session);
6eabafbe 3031 wake_up(&conn->ehwait);
7996a778
MC		 3032 return 0;
3033}
3034EXPORT_SYMBOL_GPL(iscsi_conn_start);
3035
3036static void
3bbaaad9 3037fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
7996a778 3038{
3bbaaad9 3039 struct iscsi_task *task;
b3cd5050 3040 int i, state;
7996a778 3041
3bbaaad9
MC		 3042 for (i = 0; i < conn->session->cmds_max; i++) {
3043 task = conn->session->cmds[i];
3044 if (task->sc)
3045 continue;
7996a778 3046
3bbaaad9
MC		 3047 if (task->state == ISCSI_TASK_FREE)
3048 continue;
7996a778 3049
3bbaaad9
MC		 3050 ISCSI_DBG_SESSION(conn->session,
3051 "failing mgmt itt 0x%x state %d\n",
3052 task->itt, task->state);
b3cd5050
MC		 3053 state = ISCSI_TASK_ABRT_SESS_RECOV;
3054 if (task->state == ISCSI_TASK_PENDING)
3055 state = ISCSI_TASK_COMPLETED;
3056 iscsi_complete_task(task, state);
3057
3bbaaad9 3058 }
7996a778
MC		 3059}
3060
656cffc9
MC		 3061static void iscsi_start_session_recovery(struct iscsi_session *session,
3062 struct iscsi_conn *conn, int flag)
7996a778 3063{
ed2abc7f
MC		 3064 int old_stop_stage;
3065
6724add1 3066 mutex_lock(&session->eh_mutex);
7996a778 3067 spin_lock_bh(&session->lock);
ed2abc7f 3068 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 3069 spin_unlock_bh(&session->lock);
6724add1
MC		 3070 mutex_unlock(&session->eh_mutex);
3071 return;
3072 }
3073
ed2abc7f
MC		 3074 /*
3075 * When this is called for the in_login state, we only want to clean
9c19a7d0 3076 * up the login task and connection. We do not need to block and set
67a61114 3077 * the recovery state again
ed2abc7f 3078 */
67a61114
MC		 3079 if (flag == STOP_CONN_TERM)
3080 session->state = ISCSI_STATE_TERMINATE;
3081 else if (conn->stop_stage != STOP_CONN_RECOVER)
3082 session->state = ISCSI_STATE_IN_RECOVERY;
4ae0a6c1
MC		 3083
3084 old_stop_stage = conn->stop_stage;
3085 conn->stop_stage = flag;
26013ad4 3086 spin_unlock_bh(&session->lock);
ed2abc7f 3087
26013ad4
MC		 3088 del_timer_sync(&conn->transport_timer);
3089 iscsi_suspend_tx(conn);
3090
3091 spin_lock_bh(&session->lock);
67a61114 3092 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 3093 spin_unlock_bh(&session->lock);
6724add1 3094
7996a778
MC		 3095 /*
3096 * for connection level recovery we should not calculate
3097 * header digest. conn->hdr_size used for optimization
3098 * in hdr_extract() and will be re-negotiated at
3099 * set_param() time.
3100 */
3101 if (flag == STOP_CONN_RECOVER) {
3102 conn->hdrdgst_en = 0;
3103 conn->datadgst_en = 0;
656cffc9 3104 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114 3105 old_stop_stage != STOP_CONN_RECOVER) {
1b2c7af8 3106 ISCSI_DBG_SESSION(session, "blocking session\n");
75613521 3107 iscsi_block_session(session->cls_session);
67a61114 3108 }
7996a778 3109 }
656cffc9 3110
656cffc9
MC		 3111 /*
3112 * flush queues.
3113 */
3114 spin_lock_bh(&session->lock);
b3cd5050 3115 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3bbaaad9 3116 fail_mgmt_tasks(session, conn);
5d12c05e 3117 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr));
656cffc9 3118 spin_unlock_bh(&session->lock);
6724add1 3119 mutex_unlock(&session->eh_mutex);
7996a778 3120}
7996a778
MC		 3121
3122void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3123{
3124 struct iscsi_conn *conn = cls_conn->dd_data;
3125 struct iscsi_session *session = conn->session;
3126
3127 switch (flag) {
3128 case STOP_CONN_RECOVER:
3129 case STOP_CONN_TERM:
3130 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 3131 break;
7996a778 3132 default:
322d739d
MC		 3133 iscsi_conn_printk(KERN_ERR, conn,
3134 "invalid stop flag %d\n", flag);
7996a778
MC		 3135 }
3136}
3137EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3138
3139int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3140 struct iscsi_cls_conn *cls_conn, int is_leading)
3141{
75613521 3142 struct iscsi_session *session = cls_session->dd_data;
98644047 3143 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 3144
7996a778 3145 spin_lock_bh(&session->lock);
7996a778
MC		 3146 if (is_leading)
3147 session->leadconn = conn;
98644047 3148 spin_unlock_bh(&session->lock);
7996a778
MC		 3149
3150 /*
3151 * Unblock xmitworker(), Login Phase will pass through.
3152 */
3153 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
3154 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
3155 return 0;
3156}
3157EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3158
5700b1af
MC		 3159static int iscsi_switch_str_param(char **param, char *new_val_buf)
3160{
3161 char *new_val;
3162
3163 if (*param) {
3164 if (!strcmp(*param, new_val_buf))
3165 return 0;
3166 }
3167
3168 new_val = kstrdup(new_val_buf, GFP_NOIO);
3169 if (!new_val)
3170 return -ENOMEM;
3171
3172 kfree(*param);
3173 *param = new_val;
3174 return 0;
3175}
a54a52ca
MC		 3176
3177int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3178 enum iscsi_param param, char *buf, int buflen)
3179{
3180 struct iscsi_conn *conn = cls_conn->dd_data;
3181 struct iscsi_session *session = conn->session;
3182 uint32_t value;
3183
3184 switch(param) {
843c0a8a
MC		 3185 case ISCSI_PARAM_FAST_ABORT:
3186 sscanf(buf, "%d", &session->fast_abort);
3187 break;
f6d5180c
MC		 3188 case ISCSI_PARAM_ABORT_TMO:
3189 sscanf(buf, "%d", &session->abort_timeout);
3190 break;
3191 case ISCSI_PARAM_LU_RESET_TMO:
3192 sscanf(buf, "%d", &session->lu_reset_timeout);
3193 break;
3fe5ae8b
MC		 3194 case ISCSI_PARAM_TGT_RESET_TMO:
3195 sscanf(buf, "%d", &session->tgt_reset_timeout);
3196 break;
f6d5180c
MC		 3197 case ISCSI_PARAM_PING_TMO:
3198 sscanf(buf, "%d", &conn->ping_timeout);
3199 break;
3200 case ISCSI_PARAM_RECV_TMO:
3201 sscanf(buf, "%d", &conn->recv_timeout);
3202 break;
a54a52ca
MC		 3203 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3204 sscanf(buf, "%d", &conn->max_recv_dlength);
3205 break;
3206 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3207 sscanf(buf, "%d", &conn->max_xmit_dlength);
3208 break;
3209 case ISCSI_PARAM_HDRDGST_EN:
3210 sscanf(buf, "%d", &conn->hdrdgst_en);
3211 break;
3212 case ISCSI_PARAM_DATADGST_EN:
3213 sscanf(buf, "%d", &conn->datadgst_en);
3214 break;
3215 case ISCSI_PARAM_INITIAL_R2T_EN:
3216 sscanf(buf, "%d", &session->initial_r2t_en);
3217 break;
3218 case ISCSI_PARAM_MAX_R2T:
3219 sscanf(buf, "%d", &session->max_r2t);
3220 break;
3221 case ISCSI_PARAM_IMM_DATA_EN:
3222 sscanf(buf, "%d", &session->imm_data_en);
3223 break;
3224 case ISCSI_PARAM_FIRST_BURST:
3225 sscanf(buf, "%d", &session->first_burst);
3226 break;
3227 case ISCSI_PARAM_MAX_BURST:
3228 sscanf(buf, "%d", &session->max_burst);
3229 break;
3230 case ISCSI_PARAM_PDU_INORDER_EN:
3231 sscanf(buf, "%d", &session->pdu_inorder_en);
3232 break;
3233 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3234 sscanf(buf, "%d", &session->dataseq_inorder_en);
3235 break;
3236 case ISCSI_PARAM_ERL:
3237 sscanf(buf, "%d", &session->erl);
3238 break;
3239 case ISCSI_PARAM_IFMARKER_EN:
3240 sscanf(buf, "%d", &value);
3241 BUG_ON(value);
3242 break;
3243 case ISCSI_PARAM_OFMARKER_EN:
3244 sscanf(buf, "%d", &value);
3245 BUG_ON(value);
3246 break;
3247 case ISCSI_PARAM_EXP_STATSN:
3248 sscanf(buf, "%u", &conn->exp_statsn);
3249 break;
b2c64167 3250 case ISCSI_PARAM_USERNAME:
5700b1af 3251 return iscsi_switch_str_param(&session->username, buf);
b2c64167 3252 case ISCSI_PARAM_USERNAME_IN:
5700b1af 3253 return iscsi_switch_str_param(&session->username_in, buf);
b2c64167 3254 case ISCSI_PARAM_PASSWORD:
5700b1af 3255 return iscsi_switch_str_param(&session->password, buf);
b2c64167 3256 case ISCSI_PARAM_PASSWORD_IN:
5700b1af 3257 return iscsi_switch_str_param(&session->password_in, buf);
a54a52ca 3258 case ISCSI_PARAM_TARGET_NAME:
5700b1af 3259 return iscsi_switch_str_param(&session->targetname, buf);
a54a52ca
MC		 3260 case ISCSI_PARAM_TPGT:
3261 sscanf(buf, "%d", &session->tpgt);
3262 break;
3263 case ISCSI_PARAM_PERSISTENT_PORT:
3264 sscanf(buf, "%d", &conn->persistent_port);
3265 break;
3266 case ISCSI_PARAM_PERSISTENT_ADDRESS:
5700b1af 3267 return iscsi_switch_str_param(&conn->persistent_address, buf);
88dfd340 3268 case ISCSI_PARAM_IFACE_NAME:
5700b1af 3269 return iscsi_switch_str_param(&session->ifacename, buf);
88dfd340 3270 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3271 return iscsi_switch_str_param(&session->initiatorname, buf);
a54a52ca
MC		 3272 default:
3273 return -ENOSYS;
3274 }
3275
3276 return 0;
3277}
3278EXPORT_SYMBOL_GPL(iscsi_set_param);
3279
3280int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3281 enum iscsi_param param, char *buf)
3282{
75613521 3283 struct iscsi_session *session = cls_session->dd_data;
a54a52ca
MC		 3284 int len;
3285
3286 switch(param) {
843c0a8a
MC		 3287 case ISCSI_PARAM_FAST_ABORT:
3288 len = sprintf(buf, "%d\n", session->fast_abort);
3289 break;
f6d5180c
MC		 3290 case ISCSI_PARAM_ABORT_TMO:
3291 len = sprintf(buf, "%d\n", session->abort_timeout);
3292 break;
3293 case ISCSI_PARAM_LU_RESET_TMO:
3294 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
3295 break;
3fe5ae8b
MC		 3296 case ISCSI_PARAM_TGT_RESET_TMO:
3297 len = sprintf(buf, "%d\n", session->tgt_reset_timeout);
3298 break;
a54a52ca
MC		 3299 case ISCSI_PARAM_INITIAL_R2T_EN:
3300 len = sprintf(buf, "%d\n", session->initial_r2t_en);
3301 break;
3302 case ISCSI_PARAM_MAX_R2T:
3303 len = sprintf(buf, "%hu\n", session->max_r2t);
3304 break;
3305 case ISCSI_PARAM_IMM_DATA_EN:
3306 len = sprintf(buf, "%d\n", session->imm_data_en);
3307 break;
3308 case ISCSI_PARAM_FIRST_BURST:
3309 len = sprintf(buf, "%u\n", session->first_burst);
3310 break;
3311 case ISCSI_PARAM_MAX_BURST:
3312 len = sprintf(buf, "%u\n", session->max_burst);
3313 break;
3314 case ISCSI_PARAM_PDU_INORDER_EN:
3315 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
3316 break;
3317 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3318 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
3319 break;
3320 case ISCSI_PARAM_ERL:
3321 len = sprintf(buf, "%d\n", session->erl);
3322 break;
3323 case ISCSI_PARAM_TARGET_NAME:
3324 len = sprintf(buf, "%s\n", session->targetname);
3325 break;
3326 case ISCSI_PARAM_TPGT:
3327 len = sprintf(buf, "%d\n", session->tpgt);
3328 break;
b2c64167
MC		 3329 case ISCSI_PARAM_USERNAME:
3330 len = sprintf(buf, "%s\n", session->username);
3331 break;
3332 case ISCSI_PARAM_USERNAME_IN:
3333 len = sprintf(buf, "%s\n", session->username_in);
3334 break;
3335 case ISCSI_PARAM_PASSWORD:
3336 len = sprintf(buf, "%s\n", session->password);
3337 break;
3338 case ISCSI_PARAM_PASSWORD_IN:
3339 len = sprintf(buf, "%s\n", session->password_in);
3340 break;
88dfd340
MC		 3341 case ISCSI_PARAM_IFACE_NAME:
3342 len = sprintf(buf, "%s\n", session->ifacename);
3343 break;
3344 case ISCSI_PARAM_INITIATOR_NAME:
5700b1af 3345 len = sprintf(buf, "%s\n", session->initiatorname);
88dfd340 3346 break;
a54a52ca
MC		 3347 default:
3348 return -ENOSYS;
3349 }
3350
3351 return len;
3352}
3353EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3354
00f3708e
MC		 3355int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3356 enum iscsi_param param, char *buf)
3357{
3358 struct sockaddr_in6 *sin6 = NULL;
3359 struct sockaddr_in *sin = NULL;
3360 int len;
3361
3362 switch (addr->ss_family) {
3363 case AF_INET:
3364 sin = (struct sockaddr_in *)addr;
3365 break;
3366 case AF_INET6:
3367 sin6 = (struct sockaddr_in6 *)addr;
3368 break;
3369 default:
3370 return -EINVAL;
3371 }
3372
3373 switch (param) {
3374 case ISCSI_PARAM_CONN_ADDRESS:
3375 case ISCSI_HOST_PARAM_IPADDRESS:
3376 if (sin)
3377 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr);
3378 else
3379 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr);
3380 break;
3381 case ISCSI_PARAM_CONN_PORT:
3382 if (sin)
3383 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3384 else
3385 len = sprintf(buf, "%hu\n",
3386 be16_to_cpu(sin6->sin6_port));
3387 break;
3388 default:
3389 return -EINVAL;
3390 }
3391
3392 return len;
3393}
3394EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3395
a54a52ca
MC		 3396int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3397 enum iscsi_param param, char *buf)
3398{
3399 struct iscsi_conn *conn = cls_conn->dd_data;
3400 int len;
3401
3402 switch(param) {
f6d5180c
MC		 3403 case ISCSI_PARAM_PING_TMO:
3404 len = sprintf(buf, "%u\n", conn->ping_timeout);
3405 break;
3406 case ISCSI_PARAM_RECV_TMO:
3407 len = sprintf(buf, "%u\n", conn->recv_timeout);
3408 break;
a54a52ca
MC		 3409 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3410 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
3411 break;
3412 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3413 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
3414 break;
3415 case ISCSI_PARAM_HDRDGST_EN:
3416 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
3417 break;
3418 case ISCSI_PARAM_DATADGST_EN:
3419 len = sprintf(buf, "%d\n", conn->datadgst_en);
3420 break;
3421 case ISCSI_PARAM_IFMARKER_EN:
3422 len = sprintf(buf, "%d\n", conn->ifmarker_en);
3423 break;
3424 case ISCSI_PARAM_OFMARKER_EN:
3425 len = sprintf(buf, "%d\n", conn->ofmarker_en);
3426 break;
3427 case ISCSI_PARAM_EXP_STATSN:
3428 len = sprintf(buf, "%u\n", conn->exp_statsn);
3429 break;
3430 case ISCSI_PARAM_PERSISTENT_PORT:
3431 len = sprintf(buf, "%d\n", conn->persistent_port);
3432 break;
3433 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3434 len = sprintf(buf, "%s\n", conn->persistent_address);
3435 break;
3436 default:
3437 return -ENOSYS;
3438 }
3439
3440 return len;
3441}
3442EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3443
0801c242
MC		 3444int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3445 char *buf)
3446{
75613521 3447 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3448 int len;
3449
3450 switch (param) {
d8196ed2 3451 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3452 len = sprintf(buf, "%s\n", ihost->netdev);
d8196ed2 3453 break;
0801c242 3454 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3455 len = sprintf(buf, "%s\n", ihost->hwaddress);
0801c242 3456 break;
8ad5781a 3457 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3458 len = sprintf(buf, "%s\n", ihost->initiatorname);
8ad5781a 3459 break;
0801c242
MC		 3460 default:
3461 return -ENOSYS;
3462 }
3463
3464 return len;
3465}
3466EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3467
3468int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3469 char *buf, int buflen)
3470{
75613521 3471 struct iscsi_host *ihost = shost_priv(shost);
0801c242
MC		 3472
3473 switch (param) {
d8196ed2 3474 case ISCSI_HOST_PARAM_NETDEV_NAME:
5700b1af 3475 return iscsi_switch_str_param(&ihost->netdev, buf);
0801c242 3476 case ISCSI_HOST_PARAM_HWADDRESS:
5700b1af 3477 return iscsi_switch_str_param(&ihost->hwaddress, buf);
8ad5781a 3478 case ISCSI_HOST_PARAM_INITIATOR_NAME:
5700b1af 3479 return iscsi_switch_str_param(&ihost->initiatorname, buf);
0801c242
MC		 3480 default:
3481 return -ENOSYS;
3482 }
3483
3484 return 0;
3485}
3486EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3487
7996a778
MC		 3488MODULE_AUTHOR("Mike Christie");
3489MODULE_DESCRIPTION("iSCSI library functions");
3490MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)