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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * iSCSI lib functions
4 *
5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2004 - 2006 Mike Christie
7 * Copyright (C) 2004 - 2005 Dmitry Yusupov
8 * Copyright (C) 2004 - 2005 Alex Aizman
9 * maintained by [email protected]
10 */
11#include <linux/types.h>
12#include <linux/kfifo.h>
13#include <linux/delay.h>
14#include <linux/log2.h>
15#include <linux/slab.h>
16#include <linux/sched/signal.h>
17#include <linux/module.h>
18#include <linux/unaligned.h>
19#include <net/tcp.h>
20#include <scsi/scsi_cmnd.h>
21#include <scsi/scsi_device.h>
22#include <scsi/scsi_eh.h>
23#include <scsi/scsi_tcq.h>
24#include <scsi/scsi_host.h>
25#include <scsi/scsi.h>
26#include <scsi/iscsi_proto.h>
27#include <scsi/scsi_transport.h>
28#include <scsi/scsi_transport_iscsi.h>
29#include <scsi/libiscsi.h>
30#include <trace/events/iscsi.h>
31
32static int iscsi_dbg_lib_conn;
33module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int,
34 S_IRUGO | S_IWUSR);
35MODULE_PARM_DESC(debug_libiscsi_conn,
36 "Turn on debugging for connections in libiscsi module. "
37 "Set to 1 to turn on, and zero to turn off. Default is off.");
38
39static int iscsi_dbg_lib_session;
40module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int,
41 S_IRUGO | S_IWUSR);
42MODULE_PARM_DESC(debug_libiscsi_session,
43 "Turn on debugging for sessions in libiscsi module. "
44 "Set to 1 to turn on, and zero to turn off. Default is off.");
45
46static int iscsi_dbg_lib_eh;
47module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int,
48 S_IRUGO | S_IWUSR);
49MODULE_PARM_DESC(debug_libiscsi_eh,
50 "Turn on debugging for error handling in libiscsi module. "
51 "Set to 1 to turn on, and zero to turn off. Default is off.");
52
53#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \
54 do { \
55 if (iscsi_dbg_lib_conn) \
56 iscsi_conn_printk(KERN_INFO, _conn, \
57 "%s " dbg_fmt, \
58 __func__, ##arg); \
59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \
60 &(_conn)->cls_conn->dev, \
61 "%s " dbg_fmt, __func__, ##arg);\
62 } while (0);
63
64#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \
65 do { \
66 if (iscsi_dbg_lib_session) \
67 iscsi_session_printk(KERN_INFO, _session, \
68 "%s " dbg_fmt, \
69 __func__, ##arg); \
70 iscsi_dbg_trace(trace_iscsi_dbg_session, \
71 &(_session)->cls_session->dev, \
72 "%s " dbg_fmt, __func__, ##arg); \
73 } while (0);
74
75#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \
76 do { \
77 if (iscsi_dbg_lib_eh) \
78 iscsi_session_printk(KERN_INFO, _session, \
79 "%s " dbg_fmt, \
80 __func__, ##arg); \
81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \
82 &(_session)->cls_session->dev, \
83 "%s " dbg_fmt, __func__, ##arg); \
84 } while (0);
85
86#define ISCSI_CMD_COMPL_WAIT 5
87
88inline void iscsi_conn_queue_xmit(struct iscsi_conn *conn)
89{
90 struct Scsi_Host *shost = conn->session->host;
91 struct iscsi_host *ihost = shost_priv(shost);
92
93 if (ihost->workq)
94 queue_work(ihost->workq, &conn->xmitwork);
95}
96EXPORT_SYMBOL_GPL(iscsi_conn_queue_xmit);
97
98inline void iscsi_conn_queue_recv(struct iscsi_conn *conn)
99{
100 struct Scsi_Host *shost = conn->session->host;
101 struct iscsi_host *ihost = shost_priv(shost);
102
103 if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags))
104 queue_work(ihost->workq, &conn->recvwork);
105}
106EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv);
107
108static void __iscsi_update_cmdsn(struct iscsi_session *session,
109 uint32_t exp_cmdsn, uint32_t max_cmdsn)
110{
111 /*
112 * standard specifies this check for when to update expected and
113 * max sequence numbers
114 */
115 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
116 return;
117
118 if (exp_cmdsn != session->exp_cmdsn &&
119 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
120 session->exp_cmdsn = exp_cmdsn;
121
122 if (max_cmdsn != session->max_cmdsn &&
123 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn))
124 session->max_cmdsn = max_cmdsn;
125}
126
127void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
128{
129 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn),
130 be32_to_cpu(hdr->max_cmdsn));
131}
132EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
133
134/**
135 * iscsi_prep_data_out_pdu - initialize Data-Out
136 * @task: scsi command task
137 * @r2t: R2T info
138 * @hdr: iscsi data in pdu
139 *
140 * Notes:
141 * Initialize Data-Out within this R2T sequence and finds
142 * proper data_offset within this SCSI command.
143 *
144 * This function is called with connection lock taken.
145 **/
146void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t,
147 struct iscsi_data *hdr)
148{
149 struct iscsi_conn *conn = task->conn;
150 unsigned int left = r2t->data_length - r2t->sent;
151
152 task->hdr_len = sizeof(struct iscsi_data);
153
154 memset(hdr, 0, sizeof(struct iscsi_data));
155 hdr->ttt = r2t->ttt;
156 hdr->datasn = cpu_to_be32(r2t->datasn);
157 r2t->datasn++;
158 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
159 hdr->lun = task->lun;
160 hdr->itt = task->hdr_itt;
161 hdr->exp_statsn = r2t->exp_statsn;
162 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
163 if (left > conn->max_xmit_dlength) {
164 hton24(hdr->dlength, conn->max_xmit_dlength);
165 r2t->data_count = conn->max_xmit_dlength;
166 hdr->flags = 0;
167 } else {
168 hton24(hdr->dlength, left);
169 r2t->data_count = left;
170 hdr->flags = ISCSI_FLAG_CMD_FINAL;
171 }
172 conn->dataout_pdus_cnt++;
173}
174EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu);
175
176static int iscsi_add_hdr(struct iscsi_task *task, unsigned len)
177{
178 unsigned exp_len = task->hdr_len + len;
179
180 if (exp_len > task->hdr_max) {
181 WARN_ON(1);
182 return -EINVAL;
183 }
184
185 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
186 task->hdr_len = exp_len;
187 return 0;
188}
189
190/*
191 * make an extended cdb AHS
192 */
193static int iscsi_prep_ecdb_ahs(struct iscsi_task *task)
194{
195 struct scsi_cmnd *cmd = task->sc;
196 unsigned rlen, pad_len;
197 unsigned short ahslength;
198 struct iscsi_ecdb_ahdr *ecdb_ahdr;
199 int rc;
200
201 ecdb_ahdr = iscsi_next_hdr(task);
202 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
203
204 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
205 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
206
207 pad_len = iscsi_padding(rlen);
208
209 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) +
210 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
211 if (rc)
212 return rc;
213
214 if (pad_len)
215 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
216
217 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
218 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
219 ecdb_ahdr->reserved = 0;
220 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
221
222 ISCSI_DBG_SESSION(task->conn->session,
223 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
224 "rlen %d pad_len %d ahs_length %d iscsi_headers_size "
225 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength,
226 task->hdr_len);
227 return 0;
228}
229
230/**
231 * iscsi_check_tmf_restrictions - check if a task is affected by TMF
232 * @task: iscsi task
233 * @opcode: opcode to check for
234 *
235 * During TMF a task has to be checked if it's affected.
236 * All unrelated I/O can be passed through, but I/O to the
237 * affected LUN should be restricted.
238 * If 'fast_abort' is set we won't be sending any I/O to the
239 * affected LUN.
240 * Otherwise the target is waiting for all TTTs to be completed,
241 * so we have to send all outstanding Data-Out PDUs to the target.
242 */
243static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
244{
245 struct iscsi_session *session = task->conn->session;
246 struct iscsi_tm *tmf = &session->tmhdr;
247 u64 hdr_lun;
248
249 if (session->tmf_state == TMF_INITIAL)
250 return 0;
251
252 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC)
253 return 0;
254
255 switch (ISCSI_TM_FUNC_VALUE(tmf)) {
256 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
257 /*
258 * Allow PDUs for unrelated LUNs
259 */
260 hdr_lun = scsilun_to_int(&tmf->lun);
261 if (hdr_lun != task->sc->device->lun)
262 return 0;
263 fallthrough;
264 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
265 /*
266 * Fail all SCSI cmd PDUs
267 */
268 if (opcode != ISCSI_OP_SCSI_DATA_OUT) {
269 iscsi_session_printk(KERN_INFO, session,
270 "task [op %x itt 0x%x/0x%x] rejected.\n",
271 opcode, task->itt, task->hdr_itt);
272 return -EACCES;
273 }
274 /*
275 * And also all data-out PDUs in response to R2T
276 * if fast_abort is set.
277 */
278 if (session->fast_abort) {
279 iscsi_session_printk(KERN_INFO, session,
280 "task [op %x itt 0x%x/0x%x] fast abort.\n",
281 opcode, task->itt, task->hdr_itt);
282 return -EACCES;
283 }
284 break;
285 case ISCSI_TM_FUNC_ABORT_TASK:
286 /*
287 * the caller has already checked if the task
288 * they want to abort was in the pending queue so if
289 * we are here the cmd pdu has gone out already, and
290 * we will only hit this for data-outs
291 */
292 if (opcode == ISCSI_OP_SCSI_DATA_OUT &&
293 task->hdr_itt == tmf->rtt) {
294 ISCSI_DBG_SESSION(session,
295 "Preventing task %x/%x from sending "
296 "data-out due to abort task in "
297 "progress\n", task->itt,
298 task->hdr_itt);
299 return -EACCES;
300 }
301 break;
302 }
303
304 return 0;
305}
306
307/**
308 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
309 * @task: iscsi task
310 *
311 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
312 * fields like dlength or final based on how much data it sends
313 */
314static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
315{
316 struct iscsi_conn *conn = task->conn;
317 struct iscsi_session *session = conn->session;
318 struct scsi_cmnd *sc = task->sc;
319 struct iscsi_scsi_req *hdr;
320 unsigned hdrlength, cmd_len, transfer_length;
321 itt_t itt;
322 int rc;
323
324 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD);
325 if (rc)
326 return rc;
327
328 if (conn->session->tt->alloc_pdu) {
329 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD);
330 if (rc)
331 return rc;
332 }
333 hdr = (struct iscsi_scsi_req *)task->hdr;
334 itt = hdr->itt;
335 memset(hdr, 0, sizeof(*hdr));
336
337 if (session->tt->parse_pdu_itt)
338 hdr->itt = task->hdr_itt = itt;
339 else
340 hdr->itt = task->hdr_itt = build_itt(task->itt,
341 task->conn->session->age);
342 task->hdr_len = 0;
343 rc = iscsi_add_hdr(task, sizeof(*hdr));
344 if (rc)
345 return rc;
346 hdr->opcode = ISCSI_OP_SCSI_CMD;
347 hdr->flags = ISCSI_ATTR_SIMPLE;
348 int_to_scsilun(sc->device->lun, &hdr->lun);
349 task->lun = hdr->lun;
350 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
351 cmd_len = sc->cmd_len;
352 if (cmd_len < ISCSI_CDB_SIZE)
353 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
354 else if (cmd_len > ISCSI_CDB_SIZE) {
355 rc = iscsi_prep_ecdb_ahs(task);
356 if (rc)
357 return rc;
358 cmd_len = ISCSI_CDB_SIZE;
359 }
360 memcpy(hdr->cdb, sc->cmnd, cmd_len);
361
362 task->imm_count = 0;
363 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
364 task->protected = true;
365
366 transfer_length = scsi_transfer_length(sc);
367 hdr->data_length = cpu_to_be32(transfer_length);
368 if (sc->sc_data_direction == DMA_TO_DEVICE) {
369 struct iscsi_r2t_info *r2t = &task->unsol_r2t;
370
371 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
372 /*
373 * Write counters:
374 *
375 * imm_count bytes to be sent right after
376 * SCSI PDU Header
377 *
378 * unsol_count bytes(as Data-Out) to be sent
379 * without R2T ack right after
380 * immediate data
381 *
382 * r2t data_length bytes to be sent via R2T ack's
383 *
384 * pad_count bytes to be sent as zero-padding
385 */
386 memset(r2t, 0, sizeof(*r2t));
387
388 if (session->imm_data_en) {
389 if (transfer_length >= session->first_burst)
390 task->imm_count = min(session->first_burst,
391 conn->max_xmit_dlength);
392 else
393 task->imm_count = min(transfer_length,
394 conn->max_xmit_dlength);
395 hton24(hdr->dlength, task->imm_count);
396 } else
397 zero_data(hdr->dlength);
398
399 if (!session->initial_r2t_en) {
400 r2t->data_length = min(session->first_burst,
401 transfer_length) -
402 task->imm_count;
403 r2t->data_offset = task->imm_count;
404 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
405 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn);
406 }
407
408 if (!task->unsol_r2t.data_length)
409 /* No unsolicit Data-Out's */
410 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
411 } else {
412 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
413 zero_data(hdr->dlength);
414
415 if (sc->sc_data_direction == DMA_FROM_DEVICE)
416 hdr->flags |= ISCSI_FLAG_CMD_READ;
417 }
418
419 /* calculate size of additional header segments (AHSs) */
420 hdrlength = task->hdr_len - sizeof(*hdr);
421
422 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
423 hdrlength /= ISCSI_PAD_LEN;
424
425 WARN_ON(hdrlength >= 256);
426 hdr->hlength = hdrlength & 0xFF;
427 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn);
428
429 if (session->tt->init_task && session->tt->init_task(task))
430 return -EIO;
431
432 task->state = ISCSI_TASK_RUNNING;
433 session->cmdsn++;
434
435 conn->scsicmd_pdus_cnt++;
436 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x "
437 "itt 0x%x len %d cmdsn %d win %d]\n",
438 sc->sc_data_direction == DMA_TO_DEVICE ?
439 "write" : "read", conn->id, sc, sc->cmnd[0],
440 task->itt, transfer_length,
441 session->cmdsn,
442 session->max_cmdsn - session->exp_cmdsn + 1);
443 return 0;
444}
445
446/**
447 * iscsi_free_task - free a task
448 * @task: iscsi cmd task
449 *
450 * Must be called with session back_lock.
451 * This function returns the scsi command to scsi-ml or cleans
452 * up mgmt tasks then returns the task to the pool.
453 */
454static void iscsi_free_task(struct iscsi_task *task)
455{
456 struct iscsi_conn *conn = task->conn;
457 struct iscsi_session *session = conn->session;
458 struct scsi_cmnd *sc = task->sc;
459 int oldstate = task->state;
460
461 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n",
462 task->itt, task->state, task->sc);
463
464 session->tt->cleanup_task(task);
465 task->state = ISCSI_TASK_FREE;
466 task->sc = NULL;
467 /*
468 * login task is preallocated so do not free
469 */
470 if (conn->login_task == task)
471 return;
472
473 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*));
474
475 if (sc) {
476 /* SCSI eh reuses commands to verify us */
477 iscsi_cmd(sc)->task = NULL;
478 /*
479 * queue command may call this to free the task, so
480 * it will decide how to return sc to scsi-ml.
481 */
482 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ)
483 scsi_done(sc);
484 }
485}
486
487bool iscsi_get_task(struct iscsi_task *task)
488{
489 return refcount_inc_not_zero(&task->refcount);
490}
491EXPORT_SYMBOL_GPL(iscsi_get_task);
492
493/**
494 * __iscsi_put_task - drop the refcount on a task
495 * @task: iscsi_task to drop the refcount on
496 *
497 * The back_lock must be held when calling in case it frees the task.
498 */
499void __iscsi_put_task(struct iscsi_task *task)
500{
501 if (refcount_dec_and_test(&task->refcount))
502 iscsi_free_task(task);
503}
504EXPORT_SYMBOL_GPL(__iscsi_put_task);
505
506void iscsi_put_task(struct iscsi_task *task)
507{
508 struct iscsi_session *session = task->conn->session;
509
510 if (refcount_dec_and_test(&task->refcount)) {
511 spin_lock_bh(&session->back_lock);
512 iscsi_free_task(task);
513 spin_unlock_bh(&session->back_lock);
514 }
515}
516EXPORT_SYMBOL_GPL(iscsi_put_task);
517
518/**
519 * iscsi_complete_task - finish a task
520 * @task: iscsi cmd task
521 * @state: state to complete task with
522 *
523 * Must be called with session back_lock.
524 */
525static void iscsi_complete_task(struct iscsi_task *task, int state)
526{
527 struct iscsi_conn *conn = task->conn;
528
529 ISCSI_DBG_SESSION(conn->session,
530 "complete task itt 0x%x state %d sc %p\n",
531 task->itt, task->state, task->sc);
532 if (task->state == ISCSI_TASK_COMPLETED ||
533 task->state == ISCSI_TASK_ABRT_TMF ||
534 task->state == ISCSI_TASK_ABRT_SESS_RECOV ||
535 task->state == ISCSI_TASK_REQUEUE_SCSIQ)
536 return;
537 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE);
538 task->state = state;
539
540 if (READ_ONCE(conn->ping_task) == task)
541 WRITE_ONCE(conn->ping_task, NULL);
542
543 /* release get from queueing */
544 __iscsi_put_task(task);
545}
546
547/**
548 * iscsi_complete_scsi_task - finish scsi task normally
549 * @task: iscsi task for scsi cmd
550 * @exp_cmdsn: expected cmd sn in cpu format
551 * @max_cmdsn: max cmd sn in cpu format
552 *
553 * This is used when drivers do not need or cannot perform
554 * lower level pdu processing.
555 *
556 * Called with session back_lock
557 */
558void iscsi_complete_scsi_task(struct iscsi_task *task,
559 uint32_t exp_cmdsn, uint32_t max_cmdsn)
560{
561 struct iscsi_conn *conn = task->conn;
562
563 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt);
564
565 conn->last_recv = jiffies;
566 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn);
567 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
568}
569EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task);
570
571/*
572 * Must be called with back and frwd lock
573 */
574static bool cleanup_queued_task(struct iscsi_task *task)
575{
576 struct iscsi_conn *conn = task->conn;
577 bool early_complete = false;
578
579 /*
580 * We might have raced where we handled a R2T early and got a response
581 * but have not yet taken the task off the requeue list, then a TMF or
582 * recovery happened and so we can still see it here.
583 */
584 if (task->state == ISCSI_TASK_COMPLETED)
585 early_complete = true;
586
587 if (!list_empty(&task->running)) {
588 list_del_init(&task->running);
589 /*
590 * If it's on a list but still running this could be cleanup
591 * from a TMF or session recovery.
592 */
593 if (task->state == ISCSI_TASK_RUNNING ||
594 task->state == ISCSI_TASK_COMPLETED)
595 __iscsi_put_task(task);
596 }
597
598 if (conn->session->running_aborted_task == task) {
599 conn->session->running_aborted_task = NULL;
600 __iscsi_put_task(task);
601 }
602
603 if (conn->task == task) {
604 conn->task = NULL;
605 __iscsi_put_task(task);
606 }
607
608 return early_complete;
609}
610
611/*
612 * session back and frwd lock must be held and if not called for a task that
613 * is still pending or from the xmit thread, then xmit thread must be suspended
614 */
615static void __fail_scsi_task(struct iscsi_task *task, int err)
616{
617 struct iscsi_conn *conn = task->conn;
618 struct scsi_cmnd *sc;
619 int state;
620
621 if (cleanup_queued_task(task))
622 return;
623
624 if (task->state == ISCSI_TASK_PENDING) {
625 /*
626 * cmd never made it to the xmit thread, so we should not count
627 * the cmd in the sequencing
628 */
629 conn->session->queued_cmdsn--;
630 /* it was never sent so just complete like normal */
631 state = ISCSI_TASK_COMPLETED;
632 } else if (err == DID_TRANSPORT_DISRUPTED)
633 state = ISCSI_TASK_ABRT_SESS_RECOV;
634 else
635 state = ISCSI_TASK_ABRT_TMF;
636
637 sc = task->sc;
638 sc->result = err << 16;
639 scsi_set_resid(sc, scsi_bufflen(sc));
640 iscsi_complete_task(task, state);
641}
642
643static void fail_scsi_task(struct iscsi_task *task, int err)
644{
645 struct iscsi_session *session = task->conn->session;
646
647 spin_lock_bh(&session->back_lock);
648 __fail_scsi_task(task, err);
649 spin_unlock_bh(&session->back_lock);
650}
651
652static int iscsi_prep_mgmt_task(struct iscsi_conn *conn,
653 struct iscsi_task *task)
654{
655 struct iscsi_session *session = conn->session;
656 struct iscsi_hdr *hdr = task->hdr;
657 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
658 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
659
660 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
661 return -ENOTCONN;
662
663 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT)
664 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
665 /*
666 * pre-format CmdSN for outgoing PDU.
667 */
668 nop->cmdsn = cpu_to_be32(session->cmdsn);
669 if (hdr->itt != RESERVED_ITT) {
670 /*
671 * TODO: We always use immediate for normal session pdus.
672 * If we start to send tmfs or nops as non-immediate then
673 * we should start checking the cmdsn numbers for mgmt tasks.
674 *
675 * During discovery sessions iscsid sends TEXT as non immediate,
676 * but we always only send one PDU at a time.
677 */
678 if (conn->c_stage == ISCSI_CONN_STARTED &&
679 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
680 session->queued_cmdsn++;
681 session->cmdsn++;
682 }
683 }
684
685 if (session->tt->init_task && session->tt->init_task(task))
686 return -EIO;
687
688 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
689 session->state = ISCSI_STATE_LOGGING_OUT;
690
691 task->state = ISCSI_TASK_RUNNING;
692 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x "
693 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK,
694 hdr->itt, task->data_count);
695 return 0;
696}
697
698/**
699 * iscsi_alloc_mgmt_task - allocate and setup a mgmt task.
700 * @conn: iscsi conn that the task will be sent on.
701 * @hdr: iscsi pdu that will be sent.
702 * @data: buffer for data segment if needed.
703 * @data_size: length of data in bytes.
704 */
705static struct iscsi_task *
706iscsi_alloc_mgmt_task(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
707 char *data, uint32_t data_size)
708{
709 struct iscsi_session *session = conn->session;
710 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK;
711 struct iscsi_task *task;
712 itt_t itt;
713
714 if (session->state == ISCSI_STATE_TERMINATE ||
715 !test_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags))
716 return NULL;
717
718 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) {
719 /*
720 * Login and Text are sent serially, in
721 * request-followed-by-response sequence.
722 * Same task can be used. Same ITT must be used.
723 * Note that login_task is preallocated at conn_create().
724 */
725 if (conn->login_task->state != ISCSI_TASK_FREE) {
726 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in "
727 "progress. Cannot start new task.\n");
728 return NULL;
729 }
730
731 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) {
732 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN);
733 return NULL;
734 }
735
736 task = conn->login_task;
737 } else {
738 if (session->state != ISCSI_STATE_LOGGED_IN)
739 return NULL;
740
741 if (data_size != 0) {
742 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode);
743 return NULL;
744 }
745
746 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
747 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
748
749 if (!kfifo_out(&session->cmdpool.queue,
750 (void*)&task, sizeof(void*)))
751 return NULL;
752 }
753 /*
754 * released in complete pdu for task we expect a response for, and
755 * released by the lld when it has transmitted the task for
756 * pdus we do not expect a response for.
757 */
758 refcount_set(&task->refcount, 1);
759 task->conn = conn;
760 task->sc = NULL;
761 INIT_LIST_HEAD(&task->running);
762 task->state = ISCSI_TASK_PENDING;
763
764 if (data_size) {
765 memcpy(task->data, data, data_size);
766 task->data_count = data_size;
767 } else
768 task->data_count = 0;
769
770 if (conn->session->tt->alloc_pdu) {
771 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) {
772 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate "
773 "pdu for mgmt task.\n");
774 goto free_task;
775 }
776 }
777
778 itt = task->hdr->itt;
779 task->hdr_len = sizeof(struct iscsi_hdr);
780 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr));
781
782 if (hdr->itt != RESERVED_ITT) {
783 if (session->tt->parse_pdu_itt)
784 task->hdr->itt = itt;
785 else
786 task->hdr->itt = build_itt(task->itt,
787 task->conn->session->age);
788 }
789
790 return task;
791
792free_task:
793 iscsi_put_task(task);
794 return NULL;
795}
796
797/**
798 * iscsi_send_mgmt_task - Send task created with iscsi_alloc_mgmt_task.
799 * @task: iscsi task to send.
800 *
801 * On failure this returns a non-zero error code, and the driver must free
802 * the task with iscsi_put_task;
803 */
804static int iscsi_send_mgmt_task(struct iscsi_task *task)
805{
806 struct iscsi_conn *conn = task->conn;
807 struct iscsi_session *session = conn->session;
808 struct iscsi_host *ihost = shost_priv(conn->session->host);
809 int rc = 0;
810
811 if (!ihost->workq) {
812 rc = iscsi_prep_mgmt_task(conn, task);
813 if (rc)
814 return rc;
815
816 rc = session->tt->xmit_task(task);
817 if (rc)
818 return rc;
819 } else {
820 list_add_tail(&task->running, &conn->mgmtqueue);
821 iscsi_conn_queue_xmit(conn);
822 }
823
824 return 0;
825}
826
827static int __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
828 char *data, uint32_t data_size)
829{
830 struct iscsi_task *task;
831 int rc;
832
833 task = iscsi_alloc_mgmt_task(conn, hdr, data, data_size);
834 if (!task)
835 return -ENOMEM;
836
837 rc = iscsi_send_mgmt_task(task);
838 if (rc)
839 iscsi_put_task(task);
840 return rc;
841}
842
843int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
844 char *data, uint32_t data_size)
845{
846 struct iscsi_conn *conn = cls_conn->dd_data;
847 struct iscsi_session *session = conn->session;
848 int err = 0;
849
850 spin_lock_bh(&session->frwd_lock);
851 if (__iscsi_conn_send_pdu(conn, hdr, data, data_size))
852 err = -EPERM;
853 spin_unlock_bh(&session->frwd_lock);
854 return err;
855}
856EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
857
858/**
859 * iscsi_scsi_cmd_rsp - SCSI Command Response processing
860 * @conn: iscsi connection
861 * @hdr: iscsi header
862 * @task: scsi command task
863 * @data: cmd data buffer
864 * @datalen: len of buffer
865 *
866 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
867 * then completes the command and task. called under back_lock
868 **/
869static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
870 struct iscsi_task *task, char *data,
871 int datalen)
872{
873 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr;
874 struct iscsi_session *session = conn->session;
875 struct scsi_cmnd *sc = task->sc;
876
877 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
878 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
879
880 sc->result = (DID_OK << 16) | rhdr->cmd_status;
881
882 if (task->protected) {
883 sector_t sector;
884 u8 ascq;
885
886 /**
887 * Transports that didn't implement check_protection
888 * callback but still published T10-PI support to scsi-mid
889 * deserve this BUG_ON.
890 **/
891 BUG_ON(!session->tt->check_protection);
892
893 ascq = session->tt->check_protection(task, &sector);
894 if (ascq) {
895 scsi_build_sense(sc, 1, ILLEGAL_REQUEST, 0x10, ascq);
896 scsi_set_sense_information(sc->sense_buffer,
897 SCSI_SENSE_BUFFERSIZE,
898 sector);
899 goto out;
900 }
901 }
902
903 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
904 sc->result = DID_ERROR << 16;
905 goto out;
906 }
907
908 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
909 uint16_t senselen;
910
911 if (datalen < 2) {
912invalid_datalen:
913 iscsi_conn_printk(KERN_ERR, conn,
914 "Got CHECK_CONDITION but invalid data "
915 "buffer size of %d\n", datalen);
916 sc->result = DID_BAD_TARGET << 16;
917 goto out;
918 }
919
920 senselen = get_unaligned_be16(data);
921 if (datalen < senselen + 2)
922 goto invalid_datalen;
923
924 memcpy(sc->sense_buffer, data + 2,
925 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
926 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n",
927 min_t(uint16_t, senselen,
928 SCSI_SENSE_BUFFERSIZE));
929 }
930
931 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
932 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) {
933 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
934 }
935
936 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
937 ISCSI_FLAG_CMD_OVERFLOW)) {
938 int res_count = be32_to_cpu(rhdr->residual_count);
939
940 if (res_count > 0 &&
941 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
942 res_count <= scsi_bufflen(sc)))
943 /* write side for bidi or uni-io set_resid */
944 scsi_set_resid(sc, res_count);
945 else
946 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
947 }
948out:
949 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n",
950 sc, sc->result, task->itt);
951 conn->scsirsp_pdus_cnt++;
952 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
953}
954
955/**
956 * iscsi_data_in_rsp - SCSI Data-In Response processing
957 * @conn: iscsi connection
958 * @hdr: iscsi pdu
959 * @task: scsi command task
960 *
961 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received
962 * then completes the command and task. called under back_lock
963 **/
964static void
965iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
966 struct iscsi_task *task)
967{
968 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr;
969 struct scsi_cmnd *sc = task->sc;
970
971 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS))
972 return;
973
974 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr);
975 sc->result = (DID_OK << 16) | rhdr->cmd_status;
976 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
977 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
978 ISCSI_FLAG_DATA_OVERFLOW)) {
979 int res_count = be32_to_cpu(rhdr->residual_count);
980
981 if (res_count > 0 &&
982 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
983 res_count <= sc->sdb.length))
984 scsi_set_resid(sc, res_count);
985 else
986 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
987 }
988
989 ISCSI_DBG_SESSION(conn->session, "data in with status done "
990 "[sc %p res %d itt 0x%x]\n",
991 sc, sc->result, task->itt);
992 conn->scsirsp_pdus_cnt++;
993 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
994}
995
996static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
997{
998 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
999 struct iscsi_session *session = conn->session;
1000
1001 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1002 conn->tmfrsp_pdus_cnt++;
1003
1004 if (session->tmf_state != TMF_QUEUED)
1005 return;
1006
1007 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
1008 session->tmf_state = TMF_SUCCESS;
1009 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
1010 session->tmf_state = TMF_NOT_FOUND;
1011 else
1012 session->tmf_state = TMF_FAILED;
1013 wake_up(&session->ehwait);
1014}
1015
1016static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
1017{
1018 struct iscsi_nopout hdr;
1019 struct iscsi_task *task;
1020
1021 if (!rhdr) {
1022 if (READ_ONCE(conn->ping_task))
1023 return -EINVAL;
1024 }
1025
1026 memset(&hdr, 0, sizeof(struct iscsi_nopout));
1027 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
1028 hdr.flags = ISCSI_FLAG_CMD_FINAL;
1029
1030 if (rhdr) {
1031 hdr.lun = rhdr->lun;
1032 hdr.ttt = rhdr->ttt;
1033 hdr.itt = RESERVED_ITT;
1034 } else
1035 hdr.ttt = RESERVED_ITT;
1036
1037 task = iscsi_alloc_mgmt_task(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
1038 if (!task)
1039 return -ENOMEM;
1040
1041 if (!rhdr)
1042 WRITE_ONCE(conn->ping_task, task);
1043
1044 if (iscsi_send_mgmt_task(task)) {
1045 if (!rhdr)
1046 WRITE_ONCE(conn->ping_task, NULL);
1047 iscsi_put_task(task);
1048
1049 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
1050 return -EIO;
1051 } else if (!rhdr) {
1052 /* only track our nops */
1053 conn->last_ping = jiffies;
1054 }
1055
1056 return 0;
1057}
1058
1059/**
1060 * iscsi_nop_out_rsp - SCSI NOP Response processing
1061 * @task: scsi command task
1062 * @nop: the nop structure
1063 * @data: where to put the data
1064 * @datalen: length of data
1065 *
1066 * iscsi_nop_out_rsp handles nop response from use or
1067 * from user space. called under back_lock
1068 **/
1069static int iscsi_nop_out_rsp(struct iscsi_task *task,
1070 struct iscsi_nopin *nop, char *data, int datalen)
1071{
1072 struct iscsi_conn *conn = task->conn;
1073 int rc = 0;
1074
1075 if (READ_ONCE(conn->ping_task) != task) {
1076 /*
1077 * If this is not in response to one of our
1078 * nops then it must be from userspace.
1079 */
1080 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop,
1081 data, datalen))
1082 rc = ISCSI_ERR_CONN_FAILED;
1083 } else
1084 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout);
1085 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1086 return rc;
1087}
1088
1089static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1090 char *data, int datalen)
1091{
1092 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
1093 struct iscsi_hdr rejected_pdu;
1094 int opcode, rc = 0;
1095
1096 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
1097
1098 if (ntoh24(reject->dlength) > datalen ||
1099 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) {
1100 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected "
1101 "pdu. Invalid data length (pdu dlength "
1102 "%u, datalen %d\n", ntoh24(reject->dlength),
1103 datalen);
1104 return ISCSI_ERR_PROTO;
1105 }
1106 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
1107 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK;
1108
1109 switch (reject->reason) {
1110 case ISCSI_REASON_DATA_DIGEST_ERROR:
1111 iscsi_conn_printk(KERN_ERR, conn,
1112 "pdu (op 0x%x itt 0x%x) rejected "
1113 "due to DataDigest error.\n",
1114 opcode, rejected_pdu.itt);
1115 break;
1116 case ISCSI_REASON_IMM_CMD_REJECT:
1117 iscsi_conn_printk(KERN_ERR, conn,
1118 "pdu (op 0x%x itt 0x%x) rejected. Too many "
1119 "immediate commands.\n",
1120 opcode, rejected_pdu.itt);
1121 /*
1122 * We only send one TMF at a time so if the target could not
1123 * handle it, then it should get fixed (RFC mandates that
1124 * a target can handle one immediate TMF per conn).
1125 *
1126 * For nops-outs, we could have sent more than one if
1127 * the target is sending us lots of nop-ins
1128 */
1129 if (opcode != ISCSI_OP_NOOP_OUT)
1130 return 0;
1131
1132 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
1133 /*
1134 * nop-out in response to target's nop-out rejected.
1135 * Just resend.
1136 */
1137 /* In RX path we are under back lock */
1138 spin_unlock(&conn->session->back_lock);
1139 spin_lock(&conn->session->frwd_lock);
1140 iscsi_send_nopout(conn,
1141 (struct iscsi_nopin*)&rejected_pdu);
1142 spin_unlock(&conn->session->frwd_lock);
1143 spin_lock(&conn->session->back_lock);
1144 } else {
1145 struct iscsi_task *task = NULL;
1146 /*
1147 * Our nop as ping got dropped. We know the target
1148 * and transport are ok so just clean up
1149 */
1150 if (!iscsi_verify_itt(conn, rejected_pdu.itt))
1151 task = iscsi_itt_to_task(conn, rejected_pdu.itt);
1152 if (!task || task->state == ISCSI_TASK_FREE ||
1153 task->sc) {
1154 iscsi_conn_printk(KERN_ERR, conn,
1155 "Invalid pdu reject. Could "
1156 "not lookup rejected task.\n");
1157 rc = ISCSI_ERR_BAD_ITT;
1158 } else
1159 rc = iscsi_nop_out_rsp(task,
1160 (struct iscsi_nopin*)&rejected_pdu,
1161 NULL, 0);
1162 }
1163 break;
1164 default:
1165 iscsi_conn_printk(KERN_ERR, conn,
1166 "pdu (op 0x%x itt 0x%x) rejected. Reason "
1167 "code 0x%x\n", rejected_pdu.opcode,
1168 rejected_pdu.itt, reject->reason);
1169 break;
1170 }
1171 return rc;
1172}
1173
1174/**
1175 * iscsi_itt_to_task - look up task by itt
1176 * @conn: iscsi connection
1177 * @itt: itt
1178 *
1179 * This should be used for mgmt tasks like login and nops, or if
1180 * the LDD's itt space does not include the session age.
1181 *
1182 * The session back_lock must be held.
1183 */
1184struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt)
1185{
1186 struct iscsi_session *session = conn->session;
1187 int i;
1188
1189 if (itt == RESERVED_ITT)
1190 return NULL;
1191
1192 if (session->tt->parse_pdu_itt)
1193 session->tt->parse_pdu_itt(conn, itt, &i, NULL);
1194 else
1195 i = get_itt(itt);
1196 if (i < 0 || i >= session->cmds_max)
1197 return NULL;
1198
1199 return session->cmds[i];
1200}
1201EXPORT_SYMBOL_GPL(iscsi_itt_to_task);
1202
1203/**
1204 * __iscsi_complete_pdu - complete pdu
1205 * @conn: iscsi conn
1206 * @hdr: iscsi header
1207 * @data: data buffer
1208 * @datalen: len of data buffer
1209 *
1210 * Completes pdu processing by freeing any resources allocated at
1211 * queuecommand or send generic. session back_lock must be held and verify
1212 * itt must have been called.
1213 */
1214int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1215 char *data, int datalen)
1216{
1217 struct iscsi_session *session = conn->session;
1218 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
1219 struct iscsi_task *task;
1220 uint32_t itt;
1221
1222 conn->last_recv = jiffies;
1223 rc = iscsi_verify_itt(conn, hdr->itt);
1224 if (rc)
1225 return rc;
1226
1227 if (hdr->itt != RESERVED_ITT)
1228 itt = get_itt(hdr->itt);
1229 else
1230 itt = ~0U;
1231
1232 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n",
1233 opcode, conn->id, itt, datalen);
1234
1235 if (itt == ~0U) {
1236 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1237
1238 switch(opcode) {
1239 case ISCSI_OP_NOOP_IN:
1240 if (datalen) {
1241 rc = ISCSI_ERR_PROTO;
1242 break;
1243 }
1244
1245 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
1246 break;
1247
1248 /* In RX path we are under back lock */
1249 spin_unlock(&session->back_lock);
1250 spin_lock(&session->frwd_lock);
1251 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
1252 spin_unlock(&session->frwd_lock);
1253 spin_lock(&session->back_lock);
1254 break;
1255 case ISCSI_OP_REJECT:
1256 rc = iscsi_handle_reject(conn, hdr, data, datalen);
1257 break;
1258 case ISCSI_OP_ASYNC_EVENT:
1259 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1260 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1261 rc = ISCSI_ERR_CONN_FAILED;
1262 break;
1263 default:
1264 rc = ISCSI_ERR_BAD_OPCODE;
1265 break;
1266 }
1267 goto out;
1268 }
1269
1270 switch(opcode) {
1271 case ISCSI_OP_SCSI_CMD_RSP:
1272 case ISCSI_OP_SCSI_DATA_IN:
1273 task = iscsi_itt_to_ctask(conn, hdr->itt);
1274 if (!task)
1275 return ISCSI_ERR_BAD_ITT;
1276 task->last_xfer = jiffies;
1277 break;
1278 case ISCSI_OP_R2T:
1279 /*
1280 * LLD handles R2Ts if they need to.
1281 */
1282 return 0;
1283 case ISCSI_OP_LOGOUT_RSP:
1284 case ISCSI_OP_LOGIN_RSP:
1285 case ISCSI_OP_TEXT_RSP:
1286 case ISCSI_OP_SCSI_TMFUNC_RSP:
1287 case ISCSI_OP_NOOP_IN:
1288 task = iscsi_itt_to_task(conn, hdr->itt);
1289 if (!task || task->state == ISCSI_TASK_FREE || task->sc)
1290 return ISCSI_ERR_BAD_ITT;
1291 break;
1292 default:
1293 return ISCSI_ERR_BAD_OPCODE;
1294 }
1295
1296 switch(opcode) {
1297 case ISCSI_OP_SCSI_CMD_RSP:
1298 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen);
1299 break;
1300 case ISCSI_OP_SCSI_DATA_IN:
1301 iscsi_data_in_rsp(conn, hdr, task);
1302 break;
1303 case ISCSI_OP_LOGOUT_RSP:
1304 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1305 if (datalen) {
1306 rc = ISCSI_ERR_PROTO;
1307 break;
1308 }
1309 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1310 goto recv_pdu;
1311 case ISCSI_OP_LOGIN_RSP:
1312 case ISCSI_OP_TEXT_RSP:
1313 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1314 /*
1315 * login related PDU's exp_statsn is handled in
1316 * userspace
1317 */
1318 goto recv_pdu;
1319 case ISCSI_OP_SCSI_TMFUNC_RSP:
1320 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1321 if (datalen) {
1322 rc = ISCSI_ERR_PROTO;
1323 break;
1324 }
1325
1326 iscsi_tmf_rsp(conn, hdr);
1327 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1328 break;
1329 case ISCSI_OP_NOOP_IN:
1330 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
1331 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
1332 rc = ISCSI_ERR_PROTO;
1333 break;
1334 }
1335 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
1336
1337 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr,
1338 data, datalen);
1339 break;
1340 default:
1341 rc = ISCSI_ERR_BAD_OPCODE;
1342 break;
1343 }
1344
1345out:
1346 return rc;
1347recv_pdu:
1348 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
1349 rc = ISCSI_ERR_CONN_FAILED;
1350 iscsi_complete_task(task, ISCSI_TASK_COMPLETED);
1351 return rc;
1352}
1353EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
1354
1355int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
1356 char *data, int datalen)
1357{
1358 int rc;
1359
1360 spin_lock(&conn->session->back_lock);
1361 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
1362 spin_unlock(&conn->session->back_lock);
1363 return rc;
1364}
1365EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
1366
1367int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt)
1368{
1369 struct iscsi_session *session = conn->session;
1370 int age = 0, i = 0;
1371
1372 if (itt == RESERVED_ITT)
1373 return 0;
1374
1375 if (session->tt->parse_pdu_itt)
1376 session->tt->parse_pdu_itt(conn, itt, &i, &age);
1377 else {
1378 i = get_itt(itt);
1379 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK;
1380 }
1381
1382 if (age != session->age) {
1383 iscsi_conn_printk(KERN_ERR, conn,
1384 "received itt %x expected session age (%x)\n",
1385 (__force u32)itt, session->age);
1386 return ISCSI_ERR_BAD_ITT;
1387 }
1388
1389 if (i < 0 || i >= session->cmds_max) {
1390 iscsi_conn_printk(KERN_ERR, conn,
1391 "received invalid itt index %u (max cmds "
1392 "%u.\n", i, session->cmds_max);
1393 return ISCSI_ERR_BAD_ITT;
1394 }
1395 return 0;
1396}
1397EXPORT_SYMBOL_GPL(iscsi_verify_itt);
1398
1399/**
1400 * iscsi_itt_to_ctask - look up ctask by itt
1401 * @conn: iscsi connection
1402 * @itt: itt
1403 *
1404 * This should be used for cmd tasks.
1405 *
1406 * The session back_lock must be held.
1407 */
1408struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt)
1409{
1410 struct iscsi_task *task;
1411
1412 if (iscsi_verify_itt(conn, itt))
1413 return NULL;
1414
1415 task = iscsi_itt_to_task(conn, itt);
1416 if (!task || !task->sc)
1417 return NULL;
1418
1419 if (iscsi_cmd(task->sc)->age != conn->session->age) {
1420 iscsi_session_printk(KERN_ERR, conn->session,
1421 "task's session age %d, expected %d\n",
1422 iscsi_cmd(task->sc)->age, conn->session->age);
1423 return NULL;
1424 }
1425
1426 return task;
1427}
1428EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask);
1429
1430void iscsi_session_failure(struct iscsi_session *session,
1431 enum iscsi_err err)
1432{
1433 struct iscsi_conn *conn;
1434
1435 spin_lock_bh(&session->frwd_lock);
1436 conn = session->leadconn;
1437 if (session->state == ISCSI_STATE_TERMINATE || !conn) {
1438 spin_unlock_bh(&session->frwd_lock);
1439 return;
1440 }
1441
1442 iscsi_get_conn(conn->cls_conn);
1443 spin_unlock_bh(&session->frwd_lock);
1444 /*
1445 * if the host is being removed bypass the connection
1446 * recovery initialization because we are going to kill
1447 * the session.
1448 */
1449 if (err == ISCSI_ERR_INVALID_HOST)
1450 iscsi_conn_error_event(conn->cls_conn, err);
1451 else
1452 iscsi_conn_failure(conn, err);
1453 iscsi_put_conn(conn->cls_conn);
1454}
1455EXPORT_SYMBOL_GPL(iscsi_session_failure);
1456
1457static bool iscsi_set_conn_failed(struct iscsi_conn *conn)
1458{
1459 struct iscsi_session *session = conn->session;
1460
1461 if (session->state == ISCSI_STATE_FAILED)
1462 return false;
1463
1464 if (conn->stop_stage == 0)
1465 session->state = ISCSI_STATE_FAILED;
1466
1467 set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
1468 set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
1469 return true;
1470}
1471
1472void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
1473{
1474 struct iscsi_session *session = conn->session;
1475 bool needs_evt;
1476
1477 spin_lock_bh(&session->frwd_lock);
1478 needs_evt = iscsi_set_conn_failed(conn);
1479 spin_unlock_bh(&session->frwd_lock);
1480
1481 if (needs_evt)
1482 iscsi_conn_error_event(conn->cls_conn, err);
1483}
1484EXPORT_SYMBOL_GPL(iscsi_conn_failure);
1485
1486static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
1487{
1488 struct iscsi_session *session = conn->session;
1489
1490 /*
1491 * Check for iSCSI window and take care of CmdSN wrap-around
1492 */
1493 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
1494 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn "
1495 "%u MaxCmdSN %u CmdSN %u/%u\n",
1496 session->exp_cmdsn, session->max_cmdsn,
1497 session->cmdsn, session->queued_cmdsn);
1498 return -ENOSPC;
1499 }
1500 return 0;
1501}
1502
1503static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task,
1504 bool was_requeue)
1505{
1506 int rc;
1507
1508 if (!conn->task) {
1509 /*
1510 * Take a ref so we can access it after xmit_task().
1511 *
1512 * This should never fail because the failure paths will have
1513 * stopped the xmit thread.
1514 */
1515 if (!iscsi_get_task(task)) {
1516 WARN_ON_ONCE(1);
1517 return 0;
1518 }
1519 } else {
1520 /* Already have a ref from when we failed to send it last call */
1521 conn->task = NULL;
1522 }
1523
1524 /*
1525 * If this was a requeue for a R2T we have an extra ref on the task in
1526 * case a bad target sends a cmd rsp before we have handled the task.
1527 */
1528 if (was_requeue)
1529 iscsi_put_task(task);
1530
1531 /*
1532 * Do this after dropping the extra ref because if this was a requeue
1533 * it's removed from that list and cleanup_queued_task would miss it.
1534 */
1535 if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
1536 /*
1537 * Save the task and ref in case we weren't cleaning up this
1538 * task and get woken up again.
1539 */
1540 conn->task = task;
1541 return -ENODATA;
1542 }
1543
1544 spin_unlock_bh(&conn->session->frwd_lock);
1545 rc = conn->session->tt->xmit_task(task);
1546 spin_lock_bh(&conn->session->frwd_lock);
1547 if (!rc) {
1548 /* done with this task */
1549 task->last_xfer = jiffies;
1550 } else {
1551 /*
1552 * get an extra ref that is released next time we access it
1553 * as conn->task above.
1554 */
1555 iscsi_get_task(task);
1556 conn->task = task;
1557 }
1558
1559 iscsi_put_task(task);
1560 return rc;
1561}
1562
1563/**
1564 * iscsi_requeue_task - requeue task to run from session workqueue
1565 * @task: task to requeue
1566 *
1567 * Callers must have taken a ref to the task that is going to be requeued.
1568 */
1569void iscsi_requeue_task(struct iscsi_task *task)
1570{
1571 struct iscsi_conn *conn = task->conn;
1572
1573 /*
1574 * this may be on the requeue list already if the xmit_task callout
1575 * is handling the r2ts while we are adding new ones
1576 */
1577 spin_lock_bh(&conn->session->frwd_lock);
1578 if (list_empty(&task->running)) {
1579 list_add_tail(&task->running, &conn->requeue);
1580 } else {
1581 /*
1582 * Don't need the extra ref since it's already requeued and
1583 * has a ref.
1584 */
1585 iscsi_put_task(task);
1586 }
1587 iscsi_conn_queue_xmit(conn);
1588 spin_unlock_bh(&conn->session->frwd_lock);
1589}
1590EXPORT_SYMBOL_GPL(iscsi_requeue_task);
1591
1592/**
1593 * iscsi_data_xmit - xmit any command into the scheduled connection
1594 * @conn: iscsi connection
1595 *
1596 * Notes:
1597 * The function can return -EAGAIN in which case the caller must
1598 * re-schedule it again later or recover. '0' return code means
1599 * successful xmit.
1600 **/
1601static int iscsi_data_xmit(struct iscsi_conn *conn)
1602{
1603 struct iscsi_task *task;
1604 int rc = 0;
1605
1606 spin_lock_bh(&conn->session->frwd_lock);
1607 if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
1608 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n");
1609 spin_unlock_bh(&conn->session->frwd_lock);
1610 return -ENODATA;
1611 }
1612
1613 if (conn->task) {
1614 rc = iscsi_xmit_task(conn, conn->task, false);
1615 if (rc)
1616 goto done;
1617 }
1618
1619 /*
1620 * process mgmt pdus like nops before commands since we should
1621 * only have one nop-out as a ping from us and targets should not
1622 * overflow us with nop-ins
1623 */
1624check_mgmt:
1625 while (!list_empty(&conn->mgmtqueue)) {
1626 task = list_entry(conn->mgmtqueue.next, struct iscsi_task,
1627 running);
1628 list_del_init(&task->running);
1629 if (iscsi_prep_mgmt_task(conn, task)) {
1630 /* regular RX path uses back_lock */
1631 spin_lock_bh(&conn->session->back_lock);
1632 __iscsi_put_task(task);
1633 spin_unlock_bh(&conn->session->back_lock);
1634 continue;
1635 }
1636 rc = iscsi_xmit_task(conn, task, false);
1637 if (rc)
1638 goto done;
1639 }
1640
1641check_requeue:
1642 while (!list_empty(&conn->requeue)) {
1643 /*
1644 * we always do fastlogout - conn stop code will clean up.
1645 */
1646 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
1647 break;
1648
1649 task = list_entry(conn->requeue.next, struct iscsi_task,
1650 running);
1651
1652 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT))
1653 break;
1654
1655 list_del_init(&task->running);
1656 rc = iscsi_xmit_task(conn, task, true);
1657 if (rc)
1658 goto done;
1659 if (!list_empty(&conn->mgmtqueue))
1660 goto check_mgmt;
1661 }
1662
1663 /* process pending command queue */
1664 while (!list_empty(&conn->cmdqueue)) {
1665 task = list_entry(conn->cmdqueue.next, struct iscsi_task,
1666 running);
1667 list_del_init(&task->running);
1668 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
1669 fail_scsi_task(task, DID_IMM_RETRY);
1670 continue;
1671 }
1672 rc = iscsi_prep_scsi_cmd_pdu(task);
1673 if (rc) {
1674 if (rc == -ENOMEM || rc == -EACCES)
1675 fail_scsi_task(task, DID_IMM_RETRY);
1676 else
1677 fail_scsi_task(task, DID_ABORT);
1678 continue;
1679 }
1680 rc = iscsi_xmit_task(conn, task, false);
1681 if (rc)
1682 goto done;
1683 /*
1684 * we could continuously get new task requests so
1685 * we need to check the mgmt queue for nops that need to
1686 * be sent to aviod starvation
1687 */
1688 if (!list_empty(&conn->mgmtqueue))
1689 goto check_mgmt;
1690 if (!list_empty(&conn->requeue))
1691 goto check_requeue;
1692 }
1693
1694 spin_unlock_bh(&conn->session->frwd_lock);
1695 return -ENODATA;
1696
1697done:
1698 spin_unlock_bh(&conn->session->frwd_lock);
1699 return rc;
1700}
1701
1702static void iscsi_xmitworker(struct work_struct *work)
1703{
1704 struct iscsi_conn *conn =
1705 container_of(work, struct iscsi_conn, xmitwork);
1706 int rc;
1707 /*
1708 * serialize Xmit worker on a per-connection basis.
1709 */
1710 do {
1711 rc = iscsi_data_xmit(conn);
1712 } while (rc >= 0 || rc == -EAGAIN);
1713}
1714
1715static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn,
1716 struct scsi_cmnd *sc)
1717{
1718 struct iscsi_task *task;
1719
1720 if (!kfifo_out(&conn->session->cmdpool.queue,
1721 (void *) &task, sizeof(void *)))
1722 return NULL;
1723
1724 iscsi_cmd(sc)->age = conn->session->age;
1725 iscsi_cmd(sc)->task = task;
1726
1727 refcount_set(&task->refcount, 1);
1728 task->state = ISCSI_TASK_PENDING;
1729 task->conn = conn;
1730 task->sc = sc;
1731 task->have_checked_conn = false;
1732 task->last_timeout = jiffies;
1733 task->last_xfer = jiffies;
1734 task->protected = false;
1735 INIT_LIST_HEAD(&task->running);
1736 return task;
1737}
1738
1739enum {
1740 FAILURE_BAD_HOST = 1,
1741 FAILURE_SESSION_FAILED,
1742 FAILURE_SESSION_FREED,
1743 FAILURE_WINDOW_CLOSED,
1744 FAILURE_OOM,
1745 FAILURE_SESSION_TERMINATE,
1746 FAILURE_SESSION_IN_RECOVERY,
1747 FAILURE_SESSION_RECOVERY_TIMEOUT,
1748 FAILURE_SESSION_LOGGING_OUT,
1749 FAILURE_SESSION_NOT_READY,
1750};
1751
1752enum scsi_qc_status iscsi_queuecommand(struct Scsi_Host *host,
1753 struct scsi_cmnd *sc)
1754{
1755 struct iscsi_cls_session *cls_session;
1756 struct iscsi_host *ihost;
1757 int reason = 0;
1758 struct iscsi_session *session;
1759 struct iscsi_conn *conn;
1760 struct iscsi_task *task = NULL;
1761
1762 sc->result = 0;
1763 iscsi_cmd(sc)->task = NULL;
1764
1765 ihost = shost_priv(host);
1766
1767 cls_session = starget_to_session(scsi_target(sc->device));
1768 session = cls_session->dd_data;
1769 spin_lock_bh(&session->frwd_lock);
1770
1771 reason = iscsi_session_chkready(cls_session);
1772 if (reason) {
1773 sc->result = reason;
1774 goto fault;
1775 }
1776
1777 if (session->state != ISCSI_STATE_LOGGED_IN) {
1778 /*
1779 * to handle the race between when we set the recovery state
1780 * and block the session we requeue here (commands could
1781 * be entering our queuecommand while a block is starting
1782 * up because the block code is not locked)
1783 */
1784 switch (session->state) {
1785 case ISCSI_STATE_FAILED:
1786 /*
1787 * cmds should fail during shutdown, if the session
1788 * state is bad, allowing completion to happen
1789 */
1790 if (unlikely(system_state != SYSTEM_RUNNING)) {
1791 reason = FAILURE_SESSION_FAILED;
1792 sc->result = DID_NO_CONNECT << 16;
1793 break;
1794 }
1795 fallthrough;
1796 case ISCSI_STATE_IN_RECOVERY:
1797 reason = FAILURE_SESSION_IN_RECOVERY;
1798 sc->result = DID_IMM_RETRY << 16;
1799 break;
1800 case ISCSI_STATE_LOGGING_OUT:
1801 reason = FAILURE_SESSION_LOGGING_OUT;
1802 sc->result = DID_IMM_RETRY << 16;
1803 break;
1804 case ISCSI_STATE_RECOVERY_FAILED:
1805 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1806 sc->result = DID_TRANSPORT_FAILFAST << 16;
1807 break;
1808 case ISCSI_STATE_TERMINATE:
1809 reason = FAILURE_SESSION_TERMINATE;
1810 sc->result = DID_NO_CONNECT << 16;
1811 break;
1812 default:
1813 reason = FAILURE_SESSION_FREED;
1814 sc->result = DID_NO_CONNECT << 16;
1815 }
1816 goto fault;
1817 }
1818
1819 conn = session->leadconn;
1820 if (!conn) {
1821 reason = FAILURE_SESSION_FREED;
1822 sc->result = DID_NO_CONNECT << 16;
1823 goto fault;
1824 }
1825
1826 if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) {
1827 reason = FAILURE_SESSION_IN_RECOVERY;
1828 sc->result = DID_REQUEUE << 16;
1829 goto fault;
1830 }
1831
1832 if (iscsi_check_cmdsn_window_closed(conn)) {
1833 reason = FAILURE_WINDOW_CLOSED;
1834 goto reject;
1835 }
1836
1837 task = iscsi_alloc_task(conn, sc);
1838 if (!task) {
1839 reason = FAILURE_OOM;
1840 goto reject;
1841 }
1842
1843 if (!ihost->workq) {
1844 reason = iscsi_prep_scsi_cmd_pdu(task);
1845 if (reason) {
1846 if (reason == -ENOMEM || reason == -EACCES) {
1847 reason = FAILURE_OOM;
1848 goto prepd_reject;
1849 } else {
1850 sc->result = DID_ABORT << 16;
1851 goto prepd_fault;
1852 }
1853 }
1854 if (session->tt->xmit_task(task)) {
1855 session->cmdsn--;
1856 reason = FAILURE_SESSION_NOT_READY;
1857 goto prepd_reject;
1858 }
1859 } else {
1860 list_add_tail(&task->running, &conn->cmdqueue);
1861 iscsi_conn_queue_xmit(conn);
1862 }
1863
1864 session->queued_cmdsn++;
1865 spin_unlock_bh(&session->frwd_lock);
1866 return 0;
1867
1868prepd_reject:
1869 spin_lock_bh(&session->back_lock);
1870 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1871 spin_unlock_bh(&session->back_lock);
1872reject:
1873 spin_unlock_bh(&session->frwd_lock);
1874 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n",
1875 sc->cmnd[0], reason);
1876 return SCSI_MLQUEUE_TARGET_BUSY;
1877
1878prepd_fault:
1879 spin_lock_bh(&session->back_lock);
1880 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ);
1881 spin_unlock_bh(&session->back_lock);
1882fault:
1883 spin_unlock_bh(&session->frwd_lock);
1884 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n",
1885 sc->cmnd[0], reason);
1886 scsi_set_resid(sc, scsi_bufflen(sc));
1887 scsi_done(sc);
1888 return 0;
1889}
1890EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1891
1892int iscsi_target_alloc(struct scsi_target *starget)
1893{
1894 struct iscsi_cls_session *cls_session = starget_to_session(starget);
1895 struct iscsi_session *session = cls_session->dd_data;
1896
1897 starget->can_queue = session->scsi_cmds_max;
1898 return 0;
1899}
1900EXPORT_SYMBOL_GPL(iscsi_target_alloc);
1901
1902static void iscsi_tmf_timedout(struct timer_list *t)
1903{
1904 struct iscsi_session *session = timer_container_of(session, t,
1905 tmf_timer);
1906
1907 spin_lock(&session->frwd_lock);
1908 if (session->tmf_state == TMF_QUEUED) {
1909 session->tmf_state = TMF_TIMEDOUT;
1910 ISCSI_DBG_EH(session, "tmf timedout\n");
1911 /* unblock eh_abort() */
1912 wake_up(&session->ehwait);
1913 }
1914 spin_unlock(&session->frwd_lock);
1915}
1916
1917static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1918 struct iscsi_tm *hdr, int age,
1919 int timeout)
1920 __must_hold(&session->frwd_lock)
1921{
1922 struct iscsi_session *session = conn->session;
1923
1924 if (__iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, NULL, 0)) {
1925 spin_unlock_bh(&session->frwd_lock);
1926 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n");
1927 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1928 spin_lock_bh(&session->frwd_lock);
1929 return -EPERM;
1930 }
1931 conn->tmfcmd_pdus_cnt++;
1932 session->tmf_timer.expires = timeout * HZ + jiffies;
1933 add_timer(&session->tmf_timer);
1934 ISCSI_DBG_EH(session, "tmf set timeout\n");
1935
1936 spin_unlock_bh(&session->frwd_lock);
1937 mutex_unlock(&session->eh_mutex);
1938
1939 /*
1940 * block eh thread until:
1941 *
1942 * 1) tmf response
1943 * 2) tmf timeout
1944 * 3) session is terminated or restarted or userspace has
1945 * given up on recovery
1946 */
1947 wait_event_interruptible(session->ehwait, age != session->age ||
1948 session->state != ISCSI_STATE_LOGGED_IN ||
1949 session->tmf_state != TMF_QUEUED);
1950 if (signal_pending(current))
1951 flush_signals(current);
1952 timer_delete_sync(&session->tmf_timer);
1953
1954 mutex_lock(&session->eh_mutex);
1955 spin_lock_bh(&session->frwd_lock);
1956 /* if the session drops it will clean up the task */
1957 if (age != session->age ||
1958 session->state != ISCSI_STATE_LOGGED_IN)
1959 return -ENOTCONN;
1960 return 0;
1961}
1962
1963/*
1964 * Fail commands. session frwd lock held and xmit thread flushed.
1965 */
1966static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error)
1967{
1968 struct iscsi_session *session = conn->session;
1969 struct iscsi_task *task;
1970 int i;
1971
1972restart_cmd_loop:
1973 spin_lock_bh(&session->back_lock);
1974 for (i = 0; i < session->cmds_max; i++) {
1975 task = session->cmds[i];
1976 if (!task->sc || task->state == ISCSI_TASK_FREE)
1977 continue;
1978
1979 if (lun != -1 && lun != task->sc->device->lun)
1980 continue;
1981 /*
1982 * The cmd is completing but if this is called from an eh
1983 * callout path then when we return scsi-ml owns the cmd. Wait
1984 * for the completion path to finish freeing the cmd.
1985 */
1986 if (!iscsi_get_task(task)) {
1987 spin_unlock_bh(&session->back_lock);
1988 spin_unlock_bh(&session->frwd_lock);
1989 udelay(ISCSI_CMD_COMPL_WAIT);
1990 spin_lock_bh(&session->frwd_lock);
1991 goto restart_cmd_loop;
1992 }
1993
1994 ISCSI_DBG_SESSION(session,
1995 "failing sc %p itt 0x%x state %d\n",
1996 task->sc, task->itt, task->state);
1997 __fail_scsi_task(task, error);
1998 __iscsi_put_task(task);
1999 }
2000 spin_unlock_bh(&session->back_lock);
2001}
2002
2003/**
2004 * iscsi_suspend_queue - suspend iscsi_queuecommand
2005 * @conn: iscsi conn to stop queueing IO on
2006 *
2007 * This grabs the session frwd_lock to make sure no one is in
2008 * xmit_task/queuecommand, and then sets suspend to prevent
2009 * new commands from being queued. This only needs to be called
2010 * by offload drivers that need to sync a path like ep disconnect
2011 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi
2012 * will call iscsi_start_tx and iscsi_unblock_session when in FFP.
2013 */
2014void iscsi_suspend_queue(struct iscsi_conn *conn)
2015{
2016 spin_lock_bh(&conn->session->frwd_lock);
2017 set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
2018 spin_unlock_bh(&conn->session->frwd_lock);
2019}
2020EXPORT_SYMBOL_GPL(iscsi_suspend_queue);
2021
2022/**
2023 * iscsi_suspend_tx - suspend iscsi_data_xmit
2024 * @conn: iscsi conn to stop processing IO on.
2025 *
2026 * This function sets the suspend bit to prevent iscsi_data_xmit
2027 * from sending new IO, and if work is queued on the xmit thread
2028 * it will wait for it to be completed.
2029 */
2030void iscsi_suspend_tx(struct iscsi_conn *conn)
2031{
2032 struct Scsi_Host *shost = conn->session->host;
2033 struct iscsi_host *ihost = shost_priv(shost);
2034
2035 set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
2036 if (ihost->workq)
2037 flush_work(&conn->xmitwork);
2038}
2039EXPORT_SYMBOL_GPL(iscsi_suspend_tx);
2040
2041static void iscsi_start_tx(struct iscsi_conn *conn)
2042{
2043 clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
2044 iscsi_conn_queue_xmit(conn);
2045}
2046
2047/**
2048 * iscsi_suspend_rx - Prevent recvwork from running again.
2049 * @conn: iscsi conn to stop.
2050 */
2051void iscsi_suspend_rx(struct iscsi_conn *conn)
2052{
2053 struct Scsi_Host *shost = conn->session->host;
2054 struct iscsi_host *ihost = shost_priv(shost);
2055
2056 set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
2057 if (ihost->workq)
2058 flush_work(&conn->recvwork);
2059}
2060EXPORT_SYMBOL_GPL(iscsi_suspend_rx);
2061
2062/*
2063 * We want to make sure a ping is in flight. It has timed out.
2064 * And we are not busy processing a pdu that is making
2065 * progress but got started before the ping and is taking a while
2066 * to complete so the ping is just stuck behind it in a queue.
2067 */
2068static int iscsi_has_ping_timed_out(struct iscsi_conn *conn)
2069{
2070 if (READ_ONCE(conn->ping_task) &&
2071 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
2072 (conn->ping_timeout * HZ), jiffies))
2073 return 1;
2074 else
2075 return 0;
2076}
2077
2078enum scsi_timeout_action iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc)
2079{
2080 enum scsi_timeout_action rc = SCSI_EH_NOT_HANDLED;
2081 struct iscsi_task *task = NULL, *running_task;
2082 struct iscsi_cls_session *cls_session;
2083 struct iscsi_session *session;
2084 struct iscsi_conn *conn;
2085 int i;
2086
2087 cls_session = starget_to_session(scsi_target(sc->device));
2088 session = cls_session->dd_data;
2089
2090 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc);
2091
2092 spin_lock_bh(&session->frwd_lock);
2093 spin_lock(&session->back_lock);
2094 task = iscsi_cmd(sc)->task;
2095 if (!task) {
2096 /*
2097 * Raced with completion. Blk layer has taken ownership
2098 * so let timeout code complete it now.
2099 */
2100 rc = SCSI_EH_NOT_HANDLED;
2101 spin_unlock(&session->back_lock);
2102 goto done;
2103 }
2104 if (!iscsi_get_task(task)) {
2105 /*
2106 * Racing with the completion path right now, so give it more
2107 * time so that path can complete it like normal.
2108 */
2109 rc = SCSI_EH_RESET_TIMER;
2110 task = NULL;
2111 spin_unlock(&session->back_lock);
2112 goto done;
2113 }
2114 spin_unlock(&session->back_lock);
2115
2116 if (session->state != ISCSI_STATE_LOGGED_IN) {
2117 /*
2118 * During shutdown, if session is prematurely disconnected,
2119 * recovery won't happen and there will be hung cmds. Not
2120 * handling cmds would trigger EH, also bad in this case.
2121 * Instead, handle cmd, allow completion to happen and let
2122 * upper layer to deal with the result.
2123 */
2124 if (unlikely(system_state != SYSTEM_RUNNING)) {
2125 sc->result = DID_NO_CONNECT << 16;
2126 ISCSI_DBG_EH(session, "sc on shutdown, handled\n");
2127 rc = SCSI_EH_NOT_HANDLED;
2128 goto done;
2129 }
2130 /*
2131 * We are probably in the middle of iscsi recovery so let
2132 * that complete and handle the error.
2133 */
2134 rc = SCSI_EH_RESET_TIMER;
2135 goto done;
2136 }
2137
2138 conn = session->leadconn;
2139 if (!conn) {
2140 /* In the middle of shuting down */
2141 rc = SCSI_EH_RESET_TIMER;
2142 goto done;
2143 }
2144
2145 /*
2146 * If we have sent (at least queued to the network layer) a pdu or
2147 * recvd one for the task since the last timeout ask for
2148 * more time. If on the next timeout we have not made progress
2149 * we can check if it is the task or connection when we send the
2150 * nop as a ping.
2151 */
2152 if (time_after(task->last_xfer, task->last_timeout)) {
2153 ISCSI_DBG_EH(session, "Command making progress. Asking "
2154 "scsi-ml for more time to complete. "
2155 "Last data xfer at %lu. Last timeout was at "
2156 "%lu\n.", task->last_xfer, task->last_timeout);
2157 task->have_checked_conn = false;
2158 rc = SCSI_EH_RESET_TIMER;
2159 goto done;
2160 }
2161
2162 if (!conn->recv_timeout && !conn->ping_timeout)
2163 goto done;
2164 /*
2165 * if the ping timedout then we are in the middle of cleaning up
2166 * and can let the iscsi eh handle it
2167 */
2168 if (iscsi_has_ping_timed_out(conn)) {
2169 rc = SCSI_EH_RESET_TIMER;
2170 goto done;
2171 }
2172
2173 spin_lock(&session->back_lock);
2174 for (i = 0; i < conn->session->cmds_max; i++) {
2175 running_task = conn->session->cmds[i];
2176 if (!running_task->sc || running_task == task ||
2177 running_task->state != ISCSI_TASK_RUNNING)
2178 continue;
2179
2180 /*
2181 * Only check if cmds started before this one have made
2182 * progress, or this could never fail
2183 */
2184 if (time_after(running_task->sc->jiffies_at_alloc,
2185 task->sc->jiffies_at_alloc))
2186 continue;
2187
2188 if (time_after(running_task->last_xfer, task->last_timeout)) {
2189 /*
2190 * This task has not made progress, but a task
2191 * started before us has transferred data since
2192 * we started/last-checked. We could be queueing
2193 * too many tasks or the LU is bad.
2194 *
2195 * If the device is bad the cmds ahead of us on
2196 * other devs will complete, and this loop will
2197 * eventually fail starting the scsi eh.
2198 */
2199 ISCSI_DBG_EH(session, "Command has not made progress "
2200 "but commands ahead of it have. "
2201 "Asking scsi-ml for more time to "
2202 "complete. Our last xfer vs running task "
2203 "last xfer %lu/%lu. Last check %lu.\n",
2204 task->last_xfer, running_task->last_xfer,
2205 task->last_timeout);
2206 spin_unlock(&session->back_lock);
2207 rc = SCSI_EH_RESET_TIMER;
2208 goto done;
2209 }
2210 }
2211 spin_unlock(&session->back_lock);
2212
2213 /* Assumes nop timeout is shorter than scsi cmd timeout */
2214 if (task->have_checked_conn)
2215 goto done;
2216
2217 /*
2218 * Checking the transport already or nop from a cmd timeout still
2219 * running
2220 */
2221 if (READ_ONCE(conn->ping_task)) {
2222 task->have_checked_conn = true;
2223 rc = SCSI_EH_RESET_TIMER;
2224 goto done;
2225 }
2226
2227 /* Make sure there is a transport check done */
2228 iscsi_send_nopout(conn, NULL);
2229 task->have_checked_conn = true;
2230 rc = SCSI_EH_RESET_TIMER;
2231
2232done:
2233 spin_unlock_bh(&session->frwd_lock);
2234
2235 if (task) {
2236 task->last_timeout = jiffies;
2237 iscsi_put_task(task);
2238 }
2239 ISCSI_DBG_EH(session, "return %s\n", rc == SCSI_EH_RESET_TIMER ?
2240 "timer reset" : "shutdown or nh");
2241 return rc;
2242}
2243EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out);
2244
2245static void iscsi_check_transport_timeouts(struct timer_list *t)
2246{
2247 struct iscsi_conn *conn = timer_container_of(conn, t, transport_timer);
2248 struct iscsi_session *session = conn->session;
2249 unsigned long recv_timeout, next_timeout = 0, last_recv;
2250
2251 spin_lock(&session->frwd_lock);
2252 if (session->state != ISCSI_STATE_LOGGED_IN)
2253 goto done;
2254
2255 recv_timeout = conn->recv_timeout;
2256 if (!recv_timeout)
2257 goto done;
2258
2259 recv_timeout *= HZ;
2260 last_recv = conn->last_recv;
2261
2262 if (iscsi_has_ping_timed_out(conn)) {
2263 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
2264 "expired, recv timeout %d, last rx %lu, "
2265 "last ping %lu, now %lu\n",
2266 conn->ping_timeout, conn->recv_timeout,
2267 last_recv, conn->last_ping, jiffies);
2268 spin_unlock(&session->frwd_lock);
2269 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT);
2270 return;
2271 }
2272
2273 if (time_before_eq(last_recv + recv_timeout, jiffies)) {
2274 /* send a ping to try to provoke some traffic */
2275 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n");
2276 if (iscsi_send_nopout(conn, NULL))
2277 next_timeout = jiffies + (1 * HZ);
2278 else
2279 next_timeout = conn->last_ping + (conn->ping_timeout * HZ);
2280 } else
2281 next_timeout = last_recv + recv_timeout;
2282
2283 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout);
2284 mod_timer(&conn->transport_timer, next_timeout);
2285done:
2286 spin_unlock(&session->frwd_lock);
2287}
2288
2289/**
2290 * iscsi_conn_unbind - prevent queueing to conn.
2291 * @cls_conn: iscsi conn ep is bound to.
2292 * @is_active: is the conn in use for boot or is this for EH/termination
2293 *
2294 * This must be called by drivers implementing the ep_disconnect callout.
2295 * It disables queueing to the connection from libiscsi in preparation for
2296 * an ep_disconnect call.
2297 */
2298void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active)
2299{
2300 struct iscsi_session *session;
2301 struct iscsi_conn *conn;
2302
2303 if (!cls_conn)
2304 return;
2305
2306 conn = cls_conn->dd_data;
2307 session = conn->session;
2308 /*
2309 * Wait for iscsi_eh calls to exit. We don't wait for the tmf to
2310 * complete or timeout. The caller just wants to know what's running
2311 * is everything that needs to be cleaned up, and no cmds will be
2312 * queued.
2313 */
2314 mutex_lock(&session->eh_mutex);
2315
2316 iscsi_suspend_queue(conn);
2317 iscsi_suspend_tx(conn);
2318
2319 spin_lock_bh(&session->frwd_lock);
2320 clear_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
2321
2322 if (!is_active) {
2323 /*
2324 * if logout timed out before userspace could even send a PDU
2325 * the state might still be in ISCSI_STATE_LOGGED_IN and
2326 * allowing new cmds and TMFs.
2327 */
2328 if (session->state == ISCSI_STATE_LOGGED_IN)
2329 iscsi_set_conn_failed(conn);
2330 }
2331 spin_unlock_bh(&session->frwd_lock);
2332 mutex_unlock(&session->eh_mutex);
2333}
2334EXPORT_SYMBOL_GPL(iscsi_conn_unbind);
2335
2336static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
2337 struct iscsi_tm *hdr)
2338{
2339 memset(hdr, 0, sizeof(*hdr));
2340 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2341 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
2342 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2343 hdr->lun = task->lun;
2344 hdr->rtt = task->hdr_itt;
2345 hdr->refcmdsn = task->cmdsn;
2346}
2347
2348int iscsi_eh_abort(struct scsi_cmnd *sc)
2349{
2350 struct iscsi_cls_session *cls_session;
2351 struct iscsi_session *session;
2352 struct iscsi_conn *conn;
2353 struct iscsi_task *task;
2354 struct iscsi_tm *hdr;
2355 int age;
2356
2357 cls_session = starget_to_session(scsi_target(sc->device));
2358 session = cls_session->dd_data;
2359
2360 ISCSI_DBG_EH(session, "aborting sc %p\n", sc);
2361
2362completion_check:
2363 mutex_lock(&session->eh_mutex);
2364 spin_lock_bh(&session->frwd_lock);
2365 /*
2366 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
2367 * got the command.
2368 */
2369 if (!iscsi_cmd(sc)->task) {
2370 ISCSI_DBG_EH(session, "sc never reached iscsi layer or "
2371 "it completed.\n");
2372 spin_unlock_bh(&session->frwd_lock);
2373 mutex_unlock(&session->eh_mutex);
2374 return SUCCESS;
2375 }
2376
2377 /*
2378 * If we are not logged in or we have started a new session
2379 * then let the host reset code handle this
2380 */
2381 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
2382 iscsi_cmd(sc)->age != session->age) {
2383 spin_unlock_bh(&session->frwd_lock);
2384 mutex_unlock(&session->eh_mutex);
2385 ISCSI_DBG_EH(session, "failing abort due to dropped "
2386 "session.\n");
2387 return FAILED;
2388 }
2389
2390 spin_lock(&session->back_lock);
2391 task = iscsi_cmd(sc)->task;
2392 if (!task || !task->sc) {
2393 /* task completed before time out */
2394 ISCSI_DBG_EH(session, "sc completed while abort in progress\n");
2395
2396 spin_unlock(&session->back_lock);
2397 spin_unlock_bh(&session->frwd_lock);
2398 mutex_unlock(&session->eh_mutex);
2399 return SUCCESS;
2400 }
2401
2402 if (!iscsi_get_task(task)) {
2403 spin_unlock(&session->back_lock);
2404 spin_unlock_bh(&session->frwd_lock);
2405 mutex_unlock(&session->eh_mutex);
2406 /* We are just about to call iscsi_free_task so wait for it. */
2407 udelay(ISCSI_CMD_COMPL_WAIT);
2408 goto completion_check;
2409 }
2410
2411 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt);
2412 conn = session->leadconn;
2413 iscsi_get_conn(conn->cls_conn);
2414 conn->eh_abort_cnt++;
2415 age = session->age;
2416 spin_unlock(&session->back_lock);
2417
2418 if (task->state == ISCSI_TASK_PENDING) {
2419 fail_scsi_task(task, DID_ABORT);
2420 goto success;
2421 }
2422
2423 /* only have one tmf outstanding at a time */
2424 if (session->tmf_state != TMF_INITIAL)
2425 goto failed;
2426 session->tmf_state = TMF_QUEUED;
2427
2428 hdr = &session->tmhdr;
2429 iscsi_prep_abort_task_pdu(task, hdr);
2430
2431 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout))
2432 goto failed;
2433
2434 switch (session->tmf_state) {
2435 case TMF_SUCCESS:
2436 spin_unlock_bh(&session->frwd_lock);
2437 /*
2438 * stop tx side incase the target had sent a abort rsp but
2439 * the initiator was still writing out data.
2440 */
2441 iscsi_suspend_tx(conn);
2442 /*
2443 * we do not stop the recv side because targets have been
2444 * good and have never sent us a successful tmf response
2445 * then sent more data for the cmd.
2446 */
2447 spin_lock_bh(&session->frwd_lock);
2448 fail_scsi_task(task, DID_ABORT);
2449 session->tmf_state = TMF_INITIAL;
2450 memset(hdr, 0, sizeof(*hdr));
2451 spin_unlock_bh(&session->frwd_lock);
2452 iscsi_start_tx(conn);
2453 goto success_unlocked;
2454 case TMF_TIMEDOUT:
2455 session->running_aborted_task = task;
2456 spin_unlock_bh(&session->frwd_lock);
2457 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2458 goto failed_unlocked;
2459 case TMF_NOT_FOUND:
2460 if (iscsi_task_is_completed(task)) {
2461 session->tmf_state = TMF_INITIAL;
2462 memset(hdr, 0, sizeof(*hdr));
2463 /* task completed before tmf abort response */
2464 ISCSI_DBG_EH(session, "sc completed while abort in "
2465 "progress\n");
2466 goto success;
2467 }
2468 fallthrough;
2469 default:
2470 session->tmf_state = TMF_INITIAL;
2471 goto failed;
2472 }
2473
2474success:
2475 spin_unlock_bh(&session->frwd_lock);
2476success_unlocked:
2477 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n",
2478 sc, task->itt);
2479 iscsi_put_task(task);
2480 iscsi_put_conn(conn->cls_conn);
2481 mutex_unlock(&session->eh_mutex);
2482 return SUCCESS;
2483
2484failed:
2485 spin_unlock_bh(&session->frwd_lock);
2486failed_unlocked:
2487 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc,
2488 task ? task->itt : 0);
2489 /*
2490 * The driver might be accessing the task so hold the ref. The conn
2491 * stop cleanup will drop the ref after ep_disconnect so we know the
2492 * driver's no longer touching the task.
2493 */
2494 if (!session->running_aborted_task)
2495 iscsi_put_task(task);
2496
2497 iscsi_put_conn(conn->cls_conn);
2498 mutex_unlock(&session->eh_mutex);
2499 return FAILED;
2500}
2501EXPORT_SYMBOL_GPL(iscsi_eh_abort);
2502
2503static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2504{
2505 memset(hdr, 0, sizeof(*hdr));
2506 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2507 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2508 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2509 int_to_scsilun(sc->device->lun, &hdr->lun);
2510 hdr->rtt = RESERVED_ITT;
2511}
2512
2513int iscsi_eh_device_reset(struct scsi_cmnd *sc)
2514{
2515 struct iscsi_cls_session *cls_session;
2516 struct iscsi_session *session;
2517 struct iscsi_conn *conn;
2518 struct iscsi_tm *hdr;
2519 int rc = FAILED;
2520
2521 cls_session = starget_to_session(scsi_target(sc->device));
2522 session = cls_session->dd_data;
2523
2524 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc,
2525 sc->device->lun);
2526
2527 mutex_lock(&session->eh_mutex);
2528 spin_lock_bh(&session->frwd_lock);
2529 /*
2530 * Just check if we are not logged in. We cannot check for
2531 * the phase because the reset could come from a ioctl.
2532 */
2533 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2534 goto unlock;
2535 conn = session->leadconn;
2536
2537 /* only have one tmf outstanding at a time */
2538 if (session->tmf_state != TMF_INITIAL)
2539 goto unlock;
2540 session->tmf_state = TMF_QUEUED;
2541
2542 hdr = &session->tmhdr;
2543 iscsi_prep_lun_reset_pdu(sc, hdr);
2544
2545 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2546 session->lu_reset_timeout)) {
2547 rc = FAILED;
2548 goto unlock;
2549 }
2550
2551 switch (session->tmf_state) {
2552 case TMF_SUCCESS:
2553 break;
2554 case TMF_TIMEDOUT:
2555 spin_unlock_bh(&session->frwd_lock);
2556 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2557 goto done;
2558 default:
2559 session->tmf_state = TMF_INITIAL;
2560 goto unlock;
2561 }
2562
2563 rc = SUCCESS;
2564 spin_unlock_bh(&session->frwd_lock);
2565
2566 iscsi_suspend_tx(conn);
2567
2568 spin_lock_bh(&session->frwd_lock);
2569 memset(hdr, 0, sizeof(*hdr));
2570 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR);
2571 session->tmf_state = TMF_INITIAL;
2572 spin_unlock_bh(&session->frwd_lock);
2573
2574 iscsi_start_tx(conn);
2575 goto done;
2576
2577unlock:
2578 spin_unlock_bh(&session->frwd_lock);
2579done:
2580 ISCSI_DBG_EH(session, "dev reset result = %s\n",
2581 rc == SUCCESS ? "SUCCESS" : "FAILED");
2582 mutex_unlock(&session->eh_mutex);
2583 return rc;
2584}
2585EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
2586
2587void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
2588{
2589 struct iscsi_session *session = cls_session->dd_data;
2590
2591 spin_lock_bh(&session->frwd_lock);
2592 if (session->state != ISCSI_STATE_LOGGED_IN) {
2593 session->state = ISCSI_STATE_RECOVERY_FAILED;
2594 wake_up(&session->ehwait);
2595 }
2596 spin_unlock_bh(&session->frwd_lock);
2597}
2598EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
2599
2600/**
2601 * iscsi_eh_session_reset - drop session and attempt relogin
2602 * @sc: scsi command
2603 *
2604 * This function will wait for a relogin, session termination from
2605 * userspace, or a recovery/replacement timeout.
2606 */
2607int iscsi_eh_session_reset(struct scsi_cmnd *sc)
2608{
2609 struct iscsi_cls_session *cls_session;
2610 struct iscsi_session *session;
2611 struct iscsi_conn *conn;
2612
2613 cls_session = starget_to_session(scsi_target(sc->device));
2614 session = cls_session->dd_data;
2615
2616 mutex_lock(&session->eh_mutex);
2617 spin_lock_bh(&session->frwd_lock);
2618 if (session->state == ISCSI_STATE_TERMINATE) {
2619failed:
2620 ISCSI_DBG_EH(session,
2621 "failing session reset: Could not log back into "
2622 "%s [age %d]\n", session->targetname,
2623 session->age);
2624 spin_unlock_bh(&session->frwd_lock);
2625 mutex_unlock(&session->eh_mutex);
2626 return FAILED;
2627 }
2628
2629 conn = session->leadconn;
2630 iscsi_get_conn(conn->cls_conn);
2631
2632 spin_unlock_bh(&session->frwd_lock);
2633 mutex_unlock(&session->eh_mutex);
2634
2635 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2636 iscsi_put_conn(conn->cls_conn);
2637
2638 ISCSI_DBG_EH(session, "wait for relogin\n");
2639 wait_event_interruptible(session->ehwait,
2640 session->state == ISCSI_STATE_TERMINATE ||
2641 session->state == ISCSI_STATE_LOGGED_IN ||
2642 session->state == ISCSI_STATE_RECOVERY_FAILED);
2643 if (signal_pending(current))
2644 flush_signals(current);
2645
2646 mutex_lock(&session->eh_mutex);
2647 spin_lock_bh(&session->frwd_lock);
2648 if (session->state == ISCSI_STATE_LOGGED_IN) {
2649 ISCSI_DBG_EH(session,
2650 "session reset succeeded for %s,%s\n",
2651 session->targetname, conn->persistent_address);
2652 } else
2653 goto failed;
2654 spin_unlock_bh(&session->frwd_lock);
2655 mutex_unlock(&session->eh_mutex);
2656 return SUCCESS;
2657}
2658EXPORT_SYMBOL_GPL(iscsi_eh_session_reset);
2659
2660static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
2661{
2662 memset(hdr, 0, sizeof(*hdr));
2663 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
2664 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK;
2665 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2666 hdr->rtt = RESERVED_ITT;
2667}
2668
2669/**
2670 * iscsi_eh_target_reset - reset target
2671 * @sc: scsi command
2672 *
2673 * This will attempt to send a warm target reset.
2674 */
2675static int iscsi_eh_target_reset(struct scsi_cmnd *sc)
2676{
2677 struct iscsi_cls_session *cls_session;
2678 struct iscsi_session *session;
2679 struct iscsi_conn *conn;
2680 struct iscsi_tm *hdr;
2681 int rc = FAILED;
2682
2683 cls_session = starget_to_session(scsi_target(sc->device));
2684 session = cls_session->dd_data;
2685
2686 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc,
2687 session->targetname);
2688
2689 mutex_lock(&session->eh_mutex);
2690 spin_lock_bh(&session->frwd_lock);
2691 /*
2692 * Just check if we are not logged in. We cannot check for
2693 * the phase because the reset could come from a ioctl.
2694 */
2695 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
2696 goto unlock;
2697 conn = session->leadconn;
2698
2699 /* only have one tmf outstanding at a time */
2700 if (session->tmf_state != TMF_INITIAL)
2701 goto unlock;
2702 session->tmf_state = TMF_QUEUED;
2703
2704 hdr = &session->tmhdr;
2705 iscsi_prep_tgt_reset_pdu(sc, hdr);
2706
2707 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
2708 session->tgt_reset_timeout)) {
2709 rc = FAILED;
2710 goto unlock;
2711 }
2712
2713 switch (session->tmf_state) {
2714 case TMF_SUCCESS:
2715 break;
2716 case TMF_TIMEDOUT:
2717 spin_unlock_bh(&session->frwd_lock);
2718 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST);
2719 goto done;
2720 default:
2721 session->tmf_state = TMF_INITIAL;
2722 goto unlock;
2723 }
2724
2725 rc = SUCCESS;
2726 spin_unlock_bh(&session->frwd_lock);
2727
2728 iscsi_suspend_tx(conn);
2729
2730 spin_lock_bh(&session->frwd_lock);
2731 memset(hdr, 0, sizeof(*hdr));
2732 fail_scsi_tasks(conn, -1, DID_ERROR);
2733 session->tmf_state = TMF_INITIAL;
2734 spin_unlock_bh(&session->frwd_lock);
2735
2736 iscsi_start_tx(conn);
2737 goto done;
2738
2739unlock:
2740 spin_unlock_bh(&session->frwd_lock);
2741done:
2742 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname,
2743 rc == SUCCESS ? "SUCCESS" : "FAILED");
2744 mutex_unlock(&session->eh_mutex);
2745 return rc;
2746}
2747
2748/**
2749 * iscsi_eh_recover_target - reset target and possibly the session
2750 * @sc: scsi command
2751 *
2752 * This will attempt to send a warm target reset. If that fails,
2753 * we will escalate to ERL0 session recovery.
2754 */
2755int iscsi_eh_recover_target(struct scsi_cmnd *sc)
2756{
2757 int rc;
2758
2759 rc = iscsi_eh_target_reset(sc);
2760 if (rc == FAILED)
2761 rc = iscsi_eh_session_reset(sc);
2762 return rc;
2763}
2764EXPORT_SYMBOL_GPL(iscsi_eh_recover_target);
2765
2766/*
2767 * Pre-allocate a pool of @max items of @item_size. By default, the pool
2768 * should be accessed via kfifo_{get,put} on q->queue.
2769 * Optionally, the caller can obtain the array of object pointers
2770 * by passing in a non-NULL @items pointer
2771 */
2772int
2773iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
2774{
2775 int i, num_arrays = 1;
2776
2777 memset(q, 0, sizeof(*q));
2778
2779 q->max = max;
2780
2781 /* If the user passed an items pointer, he wants a copy of
2782 * the array. */
2783 if (items)
2784 num_arrays++;
2785 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL);
2786 if (q->pool == NULL)
2787 return -ENOMEM;
2788
2789 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*));
2790
2791 for (i = 0; i < max; i++) {
2792 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
2793 if (q->pool[i] == NULL) {
2794 q->max = i;
2795 goto enomem;
2796 }
2797 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*));
2798 }
2799
2800 if (items) {
2801 *items = q->pool + max;
2802 memcpy(*items, q->pool, max * sizeof(void *));
2803 }
2804
2805 return 0;
2806
2807enomem:
2808 iscsi_pool_free(q);
2809 return -ENOMEM;
2810}
2811EXPORT_SYMBOL_GPL(iscsi_pool_init);
2812
2813void iscsi_pool_free(struct iscsi_pool *q)
2814{
2815 int i;
2816
2817 for (i = 0; i < q->max; i++)
2818 kfree(q->pool[i]);
2819 kvfree(q->pool);
2820}
2821EXPORT_SYMBOL_GPL(iscsi_pool_free);
2822
2823int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost,
2824 uint16_t requested_cmds_max)
2825{
2826 int scsi_cmds, total_cmds = requested_cmds_max;
2827
2828check:
2829 if (!total_cmds)
2830 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX;
2831 /*
2832 * The iscsi layer needs some tasks for nop handling and tmfs,
2833 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX
2834 * + 1 command for scsi IO.
2835 */
2836 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2837 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n",
2838 total_cmds, ISCSI_TOTAL_CMDS_MIN);
2839 return -EINVAL;
2840 }
2841
2842 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) {
2843 printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n",
2844 requested_cmds_max, ISCSI_TOTAL_CMDS_MAX,
2845 ISCSI_TOTAL_CMDS_MAX);
2846 total_cmds = ISCSI_TOTAL_CMDS_MAX;
2847 }
2848
2849 if (!is_power_of_2(total_cmds)) {
2850 total_cmds = rounddown_pow_of_two(total_cmds);
2851 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) {
2852 printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n", requested_cmds_max, ISCSI_TOTAL_CMDS_MIN);
2853 return -EINVAL;
2854 }
2855
2856 printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n",
2857 requested_cmds_max, total_cmds);
2858 }
2859
2860 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX;
2861 if (shost->can_queue && scsi_cmds > shost->can_queue) {
2862 total_cmds = shost->can_queue;
2863
2864 printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n",
2865 requested_cmds_max, shost->can_queue);
2866 goto check;
2867 }
2868
2869 return scsi_cmds;
2870}
2871EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds);
2872
2873/**
2874 * iscsi_host_add - add host to system
2875 * @shost: scsi host
2876 * @pdev: parent device
2877 *
2878 * This should be called by partial offload and software iscsi drivers
2879 * to add a host to the system.
2880 */
2881int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
2882{
2883 if (!shost->can_queue)
2884 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX;
2885
2886 if (!shost->cmd_per_lun)
2887 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN;
2888
2889 return scsi_add_host(shost, pdev);
2890}
2891EXPORT_SYMBOL_GPL(iscsi_host_add);
2892
2893/**
2894 * iscsi_host_alloc - allocate a host and driver data
2895 * @sht: scsi host template
2896 * @dd_data_size: driver host data size
2897 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue
2898 *
2899 * This should be called by partial offload and software iscsi drivers.
2900 * To access the driver specific memory use the iscsi_host_priv() macro.
2901 */
2902struct Scsi_Host *iscsi_host_alloc(const struct scsi_host_template *sht,
2903 int dd_data_size, bool xmit_can_sleep)
2904{
2905 struct Scsi_Host *shost;
2906 struct iscsi_host *ihost;
2907
2908 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
2909 if (!shost)
2910 return NULL;
2911 ihost = shost_priv(shost);
2912
2913 if (xmit_can_sleep) {
2914 ihost->workq = alloc_workqueue("iscsi_q_%d",
2915 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND,
2916 1, shost->host_no);
2917 if (!ihost->workq)
2918 goto free_host;
2919 }
2920
2921 spin_lock_init(&ihost->lock);
2922 ihost->state = ISCSI_HOST_SETUP;
2923 ihost->num_sessions = 0;
2924 init_waitqueue_head(&ihost->session_removal_wq);
2925 return shost;
2926
2927free_host:
2928 scsi_host_put(shost);
2929 return NULL;
2930}
2931EXPORT_SYMBOL_GPL(iscsi_host_alloc);
2932
2933static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session)
2934{
2935 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST);
2936}
2937
2938/**
2939 * iscsi_host_remove - remove host and sessions
2940 * @shost: scsi host
2941 * @is_shutdown: true if called from a driver shutdown callout
2942 *
2943 * If there are any sessions left, this will initiate the removal and wait
2944 * for the completion.
2945 */
2946void iscsi_host_remove(struct Scsi_Host *shost, bool is_shutdown)
2947{
2948 struct iscsi_host *ihost = shost_priv(shost);
2949 unsigned long flags;
2950
2951 spin_lock_irqsave(&ihost->lock, flags);
2952 ihost->state = ISCSI_HOST_REMOVED;
2953 spin_unlock_irqrestore(&ihost->lock, flags);
2954
2955 if (!is_shutdown)
2956 iscsi_host_for_each_session(shost, iscsi_notify_host_removed);
2957 else
2958 iscsi_host_for_each_session(shost, iscsi_force_destroy_session);
2959
2960 wait_event_interruptible(ihost->session_removal_wq,
2961 ihost->num_sessions == 0);
2962 if (signal_pending(current))
2963 flush_signals(current);
2964
2965 scsi_remove_host(shost);
2966}
2967EXPORT_SYMBOL_GPL(iscsi_host_remove);
2968
2969void iscsi_host_free(struct Scsi_Host *shost)
2970{
2971 struct iscsi_host *ihost = shost_priv(shost);
2972
2973 if (ihost->workq)
2974 destroy_workqueue(ihost->workq);
2975
2976 kfree(ihost->netdev);
2977 kfree(ihost->hwaddress);
2978 kfree(ihost->initiatorname);
2979 scsi_host_put(shost);
2980}
2981EXPORT_SYMBOL_GPL(iscsi_host_free);
2982
2983static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost)
2984{
2985 struct iscsi_host *ihost = shost_priv(shost);
2986 unsigned long flags;
2987
2988 shost = scsi_host_get(shost);
2989 if (!shost) {
2990 printk(KERN_ERR "Invalid state. Cannot notify host removal "
2991 "of session teardown event because host already "
2992 "removed.\n");
2993 return;
2994 }
2995
2996 spin_lock_irqsave(&ihost->lock, flags);
2997 ihost->num_sessions--;
2998 if (ihost->num_sessions == 0)
2999 wake_up(&ihost->session_removal_wq);
3000 spin_unlock_irqrestore(&ihost->lock, flags);
3001 scsi_host_put(shost);
3002}
3003
3004/**
3005 * iscsi_session_setup - create iscsi cls session and host and session
3006 * @iscsit: iscsi transport template
3007 * @shost: scsi host
3008 * @cmds_max: session can queue
3009 * @dd_size: private driver data size, added to session allocation size
3010 * @cmd_task_size: LLD task private data size
3011 * @initial_cmdsn: initial CmdSN
3012 * @id: target ID to add to this session
3013 *
3014 * This can be used by software iscsi_transports that allocate
3015 * a session per scsi host.
3016 *
3017 * Callers should set cmds_max to the largest total number (mgmt + scsi) of
3018 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks
3019 * for nop handling and login/logout requests.
3020 */
3021struct iscsi_cls_session *
3022iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost,
3023 uint16_t cmds_max, int dd_size, int cmd_task_size,
3024 uint32_t initial_cmdsn, unsigned int id)
3025{
3026 struct iscsi_host *ihost = shost_priv(shost);
3027 struct iscsi_session *session;
3028 struct iscsi_cls_session *cls_session;
3029 int cmd_i, scsi_cmds;
3030 unsigned long flags;
3031
3032 spin_lock_irqsave(&ihost->lock, flags);
3033 if (ihost->state == ISCSI_HOST_REMOVED) {
3034 spin_unlock_irqrestore(&ihost->lock, flags);
3035 return NULL;
3036 }
3037 ihost->num_sessions++;
3038 spin_unlock_irqrestore(&ihost->lock, flags);
3039
3040 scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
3041 if (scsi_cmds < 0)
3042 goto dec_session_count;
3043
3044 cls_session = iscsi_alloc_session(shost, iscsit,
3045 sizeof(struct iscsi_session) +
3046 dd_size);
3047 if (!cls_session)
3048 goto dec_session_count;
3049 session = cls_session->dd_data;
3050 session->cls_session = cls_session;
3051 session->host = shost;
3052 session->state = ISCSI_STATE_FREE;
3053 session->fast_abort = 1;
3054 session->tgt_reset_timeout = 30;
3055 session->lu_reset_timeout = 15;
3056 session->abort_timeout = 10;
3057 session->scsi_cmds_max = scsi_cmds;
3058 session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX;
3059 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
3060 session->exp_cmdsn = initial_cmdsn + 1;
3061 session->max_cmdsn = initial_cmdsn + 1;
3062 session->max_r2t = 1;
3063 session->tt = iscsit;
3064 session->dd_data = cls_session->dd_data + sizeof(*session);
3065
3066 session->tmf_state = TMF_INITIAL;
3067 timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0);
3068 mutex_init(&session->eh_mutex);
3069 init_waitqueue_head(&session->ehwait);
3070
3071 spin_lock_init(&session->frwd_lock);
3072 spin_lock_init(&session->back_lock);
3073
3074 /* initialize SCSI PDU commands pool */
3075 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
3076 (void***)&session->cmds,
3077 cmd_task_size + sizeof(struct iscsi_task)))
3078 goto cmdpool_alloc_fail;
3079
3080 /* pre-format cmds pool with ITT */
3081 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
3082 struct iscsi_task *task = session->cmds[cmd_i];
3083
3084 if (cmd_task_size)
3085 task->dd_data = &task[1];
3086 task->itt = cmd_i;
3087 task->state = ISCSI_TASK_FREE;
3088 INIT_LIST_HEAD(&task->running);
3089 }
3090
3091 if (!try_module_get(iscsit->owner))
3092 goto module_get_fail;
3093
3094 if (iscsi_add_session(cls_session, id))
3095 goto cls_session_fail;
3096
3097 return cls_session;
3098
3099cls_session_fail:
3100 module_put(iscsit->owner);
3101module_get_fail:
3102 iscsi_pool_free(&session->cmdpool);
3103cmdpool_alloc_fail:
3104 iscsi_free_session(cls_session);
3105dec_session_count:
3106 iscsi_host_dec_session_cnt(shost);
3107 return NULL;
3108}
3109EXPORT_SYMBOL_GPL(iscsi_session_setup);
3110
3111/*
3112 * issi_session_remove - Remove session from iSCSI class.
3113 */
3114void iscsi_session_remove(struct iscsi_cls_session *cls_session)
3115{
3116 struct iscsi_session *session = cls_session->dd_data;
3117 struct Scsi_Host *shost = session->host;
3118
3119 iscsi_remove_session(cls_session);
3120 /*
3121 * host removal only has to wait for its children to be removed from
3122 * sysfs, and iscsi_tcp needs to do iscsi_host_remove before freeing
3123 * the session, so drop the session count here.
3124 */
3125 iscsi_host_dec_session_cnt(shost);
3126}
3127EXPORT_SYMBOL_GPL(iscsi_session_remove);
3128
3129/**
3130 * iscsi_session_free - Free iscsi session and it's resources
3131 * @cls_session: iscsi session
3132 */
3133void iscsi_session_free(struct iscsi_cls_session *cls_session)
3134{
3135 struct iscsi_session *session = cls_session->dd_data;
3136 struct module *owner = cls_session->transport->owner;
3137
3138 iscsi_pool_free(&session->cmdpool);
3139 kfree(session->password);
3140 kfree(session->password_in);
3141 kfree(session->username);
3142 kfree(session->username_in);
3143 kfree(session->targetname);
3144 kfree(session->targetalias);
3145 kfree(session->initiatorname);
3146 kfree(session->boot_root);
3147 kfree(session->boot_nic);
3148 kfree(session->boot_target);
3149 kfree(session->ifacename);
3150 kfree(session->portal_type);
3151 kfree(session->discovery_parent_type);
3152
3153 iscsi_free_session(cls_session);
3154 module_put(owner);
3155}
3156EXPORT_SYMBOL_GPL(iscsi_session_free);
3157
3158/**
3159 * iscsi_session_teardown - destroy session and cls_session
3160 * @cls_session: iscsi session
3161 */
3162void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
3163{
3164 iscsi_session_remove(cls_session);
3165 iscsi_session_free(cls_session);
3166}
3167EXPORT_SYMBOL_GPL(iscsi_session_teardown);
3168
3169/**
3170 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
3171 * @cls_session: iscsi_cls_session
3172 * @dd_size: private driver data size
3173 * @conn_idx: cid
3174 */
3175struct iscsi_cls_conn *
3176iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
3177 uint32_t conn_idx)
3178{
3179 struct iscsi_session *session = cls_session->dd_data;
3180 struct iscsi_conn *conn;
3181 struct iscsi_cls_conn *cls_conn;
3182 char *data;
3183 int err;
3184
3185 cls_conn = iscsi_alloc_conn(cls_session, sizeof(*conn) + dd_size,
3186 conn_idx);
3187 if (!cls_conn)
3188 return NULL;
3189 conn = cls_conn->dd_data;
3190
3191 if (dd_size)
3192 conn->dd_data = cls_conn->dd_data + sizeof(*conn);
3193 conn->session = session;
3194 conn->cls_conn = cls_conn;
3195 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
3196 conn->id = conn_idx;
3197 conn->exp_statsn = 0;
3198
3199 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0);
3200
3201 INIT_LIST_HEAD(&conn->mgmtqueue);
3202 INIT_LIST_HEAD(&conn->cmdqueue);
3203 INIT_LIST_HEAD(&conn->requeue);
3204 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
3205
3206 /* allocate login_task used for the login/text sequences */
3207 spin_lock_bh(&session->frwd_lock);
3208 if (!kfifo_out(&session->cmdpool.queue,
3209 (void*)&conn->login_task,
3210 sizeof(void*))) {
3211 spin_unlock_bh(&session->frwd_lock);
3212 goto login_task_alloc_fail;
3213 }
3214 spin_unlock_bh(&session->frwd_lock);
3215
3216 data = (char *) __get_free_pages(GFP_KERNEL,
3217 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3218 if (!data)
3219 goto login_task_data_alloc_fail;
3220 conn->login_task->data = conn->data = data;
3221
3222 err = iscsi_add_conn(cls_conn);
3223 if (err)
3224 goto login_task_add_dev_fail;
3225
3226 return cls_conn;
3227
3228login_task_add_dev_fail:
3229 free_pages((unsigned long) conn->data,
3230 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3231
3232login_task_data_alloc_fail:
3233 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3234 sizeof(void*));
3235login_task_alloc_fail:
3236 iscsi_put_conn(cls_conn);
3237 return NULL;
3238}
3239EXPORT_SYMBOL_GPL(iscsi_conn_setup);
3240
3241/**
3242 * iscsi_conn_teardown - teardown iscsi connection
3243 * @cls_conn: iscsi class connection
3244 *
3245 * TODO: we may need to make this into a two step process
3246 * like scsi-mls remove + put host
3247 */
3248void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
3249{
3250 struct iscsi_conn *conn = cls_conn->dd_data;
3251 struct iscsi_session *session = conn->session;
3252
3253 iscsi_remove_conn(cls_conn);
3254
3255 timer_delete_sync(&conn->transport_timer);
3256
3257 mutex_lock(&session->eh_mutex);
3258 spin_lock_bh(&session->frwd_lock);
3259 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
3260 if (session->leadconn == conn) {
3261 /*
3262 * leading connection? then give up on recovery.
3263 */
3264 session->state = ISCSI_STATE_TERMINATE;
3265 wake_up(&session->ehwait);
3266 }
3267 spin_unlock_bh(&session->frwd_lock);
3268
3269 /* flush queued up work because we free the connection below */
3270 iscsi_suspend_tx(conn);
3271
3272 spin_lock_bh(&session->frwd_lock);
3273 free_pages((unsigned long) conn->data,
3274 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
3275 kfree(conn->persistent_address);
3276 kfree(conn->local_ipaddr);
3277 /* regular RX path uses back_lock */
3278 spin_lock_bh(&session->back_lock);
3279 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
3280 sizeof(void*));
3281 spin_unlock_bh(&session->back_lock);
3282 if (session->leadconn == conn)
3283 session->leadconn = NULL;
3284 spin_unlock_bh(&session->frwd_lock);
3285 mutex_unlock(&session->eh_mutex);
3286
3287 iscsi_put_conn(cls_conn);
3288}
3289EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
3290
3291int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
3292{
3293 struct iscsi_conn *conn = cls_conn->dd_data;
3294 struct iscsi_session *session = conn->session;
3295
3296 if (!session) {
3297 iscsi_conn_printk(KERN_ERR, conn,
3298 "can't start unbound connection\n");
3299 return -EPERM;
3300 }
3301
3302 if ((session->imm_data_en || !session->initial_r2t_en) &&
3303 session->first_burst > session->max_burst) {
3304 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
3305 "first_burst %d max_burst %d\n",
3306 session->first_burst, session->max_burst);
3307 return -EINVAL;
3308 }
3309
3310 if (conn->ping_timeout && !conn->recv_timeout) {
3311 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
3312 "zero. Using 5 seconds.\n");
3313 conn->recv_timeout = 5;
3314 }
3315
3316 if (conn->recv_timeout && !conn->ping_timeout) {
3317 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
3318 "zero. Using 5 seconds.\n");
3319 conn->ping_timeout = 5;
3320 }
3321
3322 spin_lock_bh(&session->frwd_lock);
3323 conn->c_stage = ISCSI_CONN_STARTED;
3324 session->state = ISCSI_STATE_LOGGED_IN;
3325 session->queued_cmdsn = session->cmdsn;
3326
3327 conn->last_recv = jiffies;
3328 conn->last_ping = jiffies;
3329 if (conn->recv_timeout && conn->ping_timeout)
3330 mod_timer(&conn->transport_timer,
3331 jiffies + (conn->recv_timeout * HZ));
3332
3333 switch(conn->stop_stage) {
3334 case STOP_CONN_RECOVER:
3335 /*
3336 * unblock eh_abort() if it is blocked. re-try all
3337 * commands after successful recovery
3338 */
3339 conn->stop_stage = 0;
3340 session->tmf_state = TMF_INITIAL;
3341 session->age++;
3342 if (session->age == 16)
3343 session->age = 0;
3344 break;
3345 case STOP_CONN_TERM:
3346 conn->stop_stage = 0;
3347 break;
3348 default:
3349 break;
3350 }
3351 spin_unlock_bh(&session->frwd_lock);
3352
3353 iscsi_unblock_session(session->cls_session);
3354 wake_up(&session->ehwait);
3355 return 0;
3356}
3357EXPORT_SYMBOL_GPL(iscsi_conn_start);
3358
3359static void
3360fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn)
3361{
3362 struct iscsi_task *task;
3363 int i, state;
3364
3365 for (i = 0; i < conn->session->cmds_max; i++) {
3366 task = conn->session->cmds[i];
3367 if (task->sc)
3368 continue;
3369
3370 if (task->state == ISCSI_TASK_FREE)
3371 continue;
3372
3373 ISCSI_DBG_SESSION(conn->session,
3374 "failing mgmt itt 0x%x state %d\n",
3375 task->itt, task->state);
3376
3377 spin_lock_bh(&session->back_lock);
3378 if (cleanup_queued_task(task)) {
3379 spin_unlock_bh(&session->back_lock);
3380 continue;
3381 }
3382
3383 state = ISCSI_TASK_ABRT_SESS_RECOV;
3384 if (task->state == ISCSI_TASK_PENDING)
3385 state = ISCSI_TASK_COMPLETED;
3386 iscsi_complete_task(task, state);
3387 spin_unlock_bh(&session->back_lock);
3388 }
3389}
3390
3391void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
3392{
3393 struct iscsi_conn *conn = cls_conn->dd_data;
3394 struct iscsi_session *session = conn->session;
3395 int old_stop_stage;
3396
3397 mutex_lock(&session->eh_mutex);
3398 spin_lock_bh(&session->frwd_lock);
3399 if (conn->stop_stage == STOP_CONN_TERM) {
3400 spin_unlock_bh(&session->frwd_lock);
3401 mutex_unlock(&session->eh_mutex);
3402 return;
3403 }
3404
3405 /*
3406 * When this is called for the in_login state, we only want to clean
3407 * up the login task and connection. We do not need to block and set
3408 * the recovery state again
3409 */
3410 if (flag == STOP_CONN_TERM)
3411 session->state = ISCSI_STATE_TERMINATE;
3412 else if (conn->stop_stage != STOP_CONN_RECOVER)
3413 session->state = ISCSI_STATE_IN_RECOVERY;
3414
3415 old_stop_stage = conn->stop_stage;
3416 conn->stop_stage = flag;
3417 spin_unlock_bh(&session->frwd_lock);
3418
3419 timer_delete_sync(&conn->transport_timer);
3420 iscsi_suspend_tx(conn);
3421
3422 spin_lock_bh(&session->frwd_lock);
3423 conn->c_stage = ISCSI_CONN_STOPPED;
3424 spin_unlock_bh(&session->frwd_lock);
3425
3426 /*
3427 * for connection level recovery we should not calculate
3428 * header digest. conn->hdr_size used for optimization
3429 * in hdr_extract() and will be re-negotiated at
3430 * set_param() time.
3431 */
3432 if (flag == STOP_CONN_RECOVER) {
3433 conn->hdrdgst_en = 0;
3434 conn->datadgst_en = 0;
3435 if (session->state == ISCSI_STATE_IN_RECOVERY &&
3436 old_stop_stage != STOP_CONN_RECOVER) {
3437 ISCSI_DBG_SESSION(session, "blocking session\n");
3438 iscsi_block_session(session->cls_session);
3439 }
3440 }
3441
3442 /*
3443 * flush queues.
3444 */
3445 spin_lock_bh(&session->frwd_lock);
3446 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED);
3447 fail_mgmt_tasks(session, conn);
3448 memset(&session->tmhdr, 0, sizeof(session->tmhdr));
3449 spin_unlock_bh(&session->frwd_lock);
3450 mutex_unlock(&session->eh_mutex);
3451}
3452EXPORT_SYMBOL_GPL(iscsi_conn_stop);
3453
3454int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
3455 struct iscsi_cls_conn *cls_conn, int is_leading)
3456{
3457 struct iscsi_session *session = cls_session->dd_data;
3458 struct iscsi_conn *conn = cls_conn->dd_data;
3459
3460 spin_lock_bh(&session->frwd_lock);
3461 if (is_leading)
3462 session->leadconn = conn;
3463
3464 set_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags);
3465 spin_unlock_bh(&session->frwd_lock);
3466
3467 /*
3468 * The target could have reduced it's window size between logins, so
3469 * we have to reset max/exp cmdsn so we can see the new values.
3470 */
3471 spin_lock_bh(&session->back_lock);
3472 session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1;
3473 spin_unlock_bh(&session->back_lock);
3474 /*
3475 * Unblock xmitworker(), Login Phase will pass through.
3476 */
3477 clear_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags);
3478 clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags);
3479 return 0;
3480}
3481EXPORT_SYMBOL_GPL(iscsi_conn_bind);
3482
3483int iscsi_switch_str_param(char **param, char *new_val_buf)
3484{
3485 char *new_val;
3486
3487 if (*param) {
3488 if (!strcmp(*param, new_val_buf))
3489 return 0;
3490 }
3491
3492 new_val = kstrdup(new_val_buf, GFP_NOIO);
3493 if (!new_val)
3494 return -ENOMEM;
3495
3496 kfree(*param);
3497 *param = new_val;
3498 return 0;
3499}
3500EXPORT_SYMBOL_GPL(iscsi_switch_str_param);
3501
3502int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
3503 enum iscsi_param param, char *buf, int buflen)
3504{
3505 struct iscsi_conn *conn = cls_conn->dd_data;
3506 struct iscsi_session *session = conn->session;
3507 int val;
3508
3509 switch(param) {
3510 case ISCSI_PARAM_FAST_ABORT:
3511 sscanf(buf, "%d", &session->fast_abort);
3512 break;
3513 case ISCSI_PARAM_ABORT_TMO:
3514 sscanf(buf, "%d", &session->abort_timeout);
3515 break;
3516 case ISCSI_PARAM_LU_RESET_TMO:
3517 sscanf(buf, "%d", &session->lu_reset_timeout);
3518 break;
3519 case ISCSI_PARAM_TGT_RESET_TMO:
3520 sscanf(buf, "%d", &session->tgt_reset_timeout);
3521 break;
3522 case ISCSI_PARAM_PING_TMO:
3523 sscanf(buf, "%d", &conn->ping_timeout);
3524 break;
3525 case ISCSI_PARAM_RECV_TMO:
3526 sscanf(buf, "%d", &conn->recv_timeout);
3527 break;
3528 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3529 sscanf(buf, "%d", &conn->max_recv_dlength);
3530 break;
3531 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3532 sscanf(buf, "%d", &conn->max_xmit_dlength);
3533 break;
3534 case ISCSI_PARAM_HDRDGST_EN:
3535 sscanf(buf, "%d", &conn->hdrdgst_en);
3536 break;
3537 case ISCSI_PARAM_DATADGST_EN:
3538 sscanf(buf, "%d", &conn->datadgst_en);
3539 break;
3540 case ISCSI_PARAM_INITIAL_R2T_EN:
3541 sscanf(buf, "%d", &session->initial_r2t_en);
3542 break;
3543 case ISCSI_PARAM_MAX_R2T:
3544 sscanf(buf, "%hu", &session->max_r2t);
3545 break;
3546 case ISCSI_PARAM_IMM_DATA_EN:
3547 sscanf(buf, "%d", &session->imm_data_en);
3548 break;
3549 case ISCSI_PARAM_FIRST_BURST:
3550 sscanf(buf, "%d", &session->first_burst);
3551 break;
3552 case ISCSI_PARAM_MAX_BURST:
3553 sscanf(buf, "%d", &session->max_burst);
3554 break;
3555 case ISCSI_PARAM_PDU_INORDER_EN:
3556 sscanf(buf, "%d", &session->pdu_inorder_en);
3557 break;
3558 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3559 sscanf(buf, "%d", &session->dataseq_inorder_en);
3560 break;
3561 case ISCSI_PARAM_ERL:
3562 sscanf(buf, "%d", &session->erl);
3563 break;
3564 case ISCSI_PARAM_EXP_STATSN:
3565 sscanf(buf, "%u", &conn->exp_statsn);
3566 break;
3567 case ISCSI_PARAM_USERNAME:
3568 return iscsi_switch_str_param(&session->username, buf);
3569 case ISCSI_PARAM_USERNAME_IN:
3570 return iscsi_switch_str_param(&session->username_in, buf);
3571 case ISCSI_PARAM_PASSWORD:
3572 return iscsi_switch_str_param(&session->password, buf);
3573 case ISCSI_PARAM_PASSWORD_IN:
3574 return iscsi_switch_str_param(&session->password_in, buf);
3575 case ISCSI_PARAM_TARGET_NAME:
3576 return iscsi_switch_str_param(&session->targetname, buf);
3577 case ISCSI_PARAM_TARGET_ALIAS:
3578 return iscsi_switch_str_param(&session->targetalias, buf);
3579 case ISCSI_PARAM_TPGT:
3580 sscanf(buf, "%d", &session->tpgt);
3581 break;
3582 case ISCSI_PARAM_PERSISTENT_PORT:
3583 sscanf(buf, "%d", &conn->persistent_port);
3584 break;
3585 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3586 return iscsi_switch_str_param(&conn->persistent_address, buf);
3587 case ISCSI_PARAM_IFACE_NAME:
3588 return iscsi_switch_str_param(&session->ifacename, buf);
3589 case ISCSI_PARAM_INITIATOR_NAME:
3590 return iscsi_switch_str_param(&session->initiatorname, buf);
3591 case ISCSI_PARAM_BOOT_ROOT:
3592 return iscsi_switch_str_param(&session->boot_root, buf);
3593 case ISCSI_PARAM_BOOT_NIC:
3594 return iscsi_switch_str_param(&session->boot_nic, buf);
3595 case ISCSI_PARAM_BOOT_TARGET:
3596 return iscsi_switch_str_param(&session->boot_target, buf);
3597 case ISCSI_PARAM_PORTAL_TYPE:
3598 return iscsi_switch_str_param(&session->portal_type, buf);
3599 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3600 return iscsi_switch_str_param(&session->discovery_parent_type,
3601 buf);
3602 case ISCSI_PARAM_DISCOVERY_SESS:
3603 sscanf(buf, "%d", &val);
3604 session->discovery_sess = !!val;
3605 break;
3606 case ISCSI_PARAM_LOCAL_IPADDR:
3607 return iscsi_switch_str_param(&conn->local_ipaddr, buf);
3608 default:
3609 return -ENOSYS;
3610 }
3611
3612 return 0;
3613}
3614EXPORT_SYMBOL_GPL(iscsi_set_param);
3615
3616int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
3617 enum iscsi_param param, char *buf)
3618{
3619 struct iscsi_session *session = cls_session->dd_data;
3620 int len;
3621
3622 switch(param) {
3623 case ISCSI_PARAM_FAST_ABORT:
3624 len = sysfs_emit(buf, "%d\n", session->fast_abort);
3625 break;
3626 case ISCSI_PARAM_ABORT_TMO:
3627 len = sysfs_emit(buf, "%d\n", session->abort_timeout);
3628 break;
3629 case ISCSI_PARAM_LU_RESET_TMO:
3630 len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout);
3631 break;
3632 case ISCSI_PARAM_TGT_RESET_TMO:
3633 len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout);
3634 break;
3635 case ISCSI_PARAM_INITIAL_R2T_EN:
3636 len = sysfs_emit(buf, "%d\n", session->initial_r2t_en);
3637 break;
3638 case ISCSI_PARAM_MAX_R2T:
3639 len = sysfs_emit(buf, "%hu\n", session->max_r2t);
3640 break;
3641 case ISCSI_PARAM_IMM_DATA_EN:
3642 len = sysfs_emit(buf, "%d\n", session->imm_data_en);
3643 break;
3644 case ISCSI_PARAM_FIRST_BURST:
3645 len = sysfs_emit(buf, "%u\n", session->first_burst);
3646 break;
3647 case ISCSI_PARAM_MAX_BURST:
3648 len = sysfs_emit(buf, "%u\n", session->max_burst);
3649 break;
3650 case ISCSI_PARAM_PDU_INORDER_EN:
3651 len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en);
3652 break;
3653 case ISCSI_PARAM_DATASEQ_INORDER_EN:
3654 len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en);
3655 break;
3656 case ISCSI_PARAM_DEF_TASKMGMT_TMO:
3657 len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo);
3658 break;
3659 case ISCSI_PARAM_ERL:
3660 len = sysfs_emit(buf, "%d\n", session->erl);
3661 break;
3662 case ISCSI_PARAM_TARGET_NAME:
3663 len = sysfs_emit(buf, "%s\n", session->targetname);
3664 break;
3665 case ISCSI_PARAM_TARGET_ALIAS:
3666 len = sysfs_emit(buf, "%s\n", session->targetalias);
3667 break;
3668 case ISCSI_PARAM_TPGT:
3669 len = sysfs_emit(buf, "%d\n", session->tpgt);
3670 break;
3671 case ISCSI_PARAM_USERNAME:
3672 len = sysfs_emit(buf, "%s\n", session->username);
3673 break;
3674 case ISCSI_PARAM_USERNAME_IN:
3675 len = sysfs_emit(buf, "%s\n", session->username_in);
3676 break;
3677 case ISCSI_PARAM_PASSWORD:
3678 len = sysfs_emit(buf, "%s\n", session->password);
3679 break;
3680 case ISCSI_PARAM_PASSWORD_IN:
3681 len = sysfs_emit(buf, "%s\n", session->password_in);
3682 break;
3683 case ISCSI_PARAM_IFACE_NAME:
3684 len = sysfs_emit(buf, "%s\n", session->ifacename);
3685 break;
3686 case ISCSI_PARAM_INITIATOR_NAME:
3687 len = sysfs_emit(buf, "%s\n", session->initiatorname);
3688 break;
3689 case ISCSI_PARAM_BOOT_ROOT:
3690 len = sysfs_emit(buf, "%s\n", session->boot_root);
3691 break;
3692 case ISCSI_PARAM_BOOT_NIC:
3693 len = sysfs_emit(buf, "%s\n", session->boot_nic);
3694 break;
3695 case ISCSI_PARAM_BOOT_TARGET:
3696 len = sysfs_emit(buf, "%s\n", session->boot_target);
3697 break;
3698 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE:
3699 len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable);
3700 break;
3701 case ISCSI_PARAM_DISCOVERY_SESS:
3702 len = sysfs_emit(buf, "%u\n", session->discovery_sess);
3703 break;
3704 case ISCSI_PARAM_PORTAL_TYPE:
3705 len = sysfs_emit(buf, "%s\n", session->portal_type);
3706 break;
3707 case ISCSI_PARAM_CHAP_AUTH_EN:
3708 len = sysfs_emit(buf, "%u\n", session->chap_auth_en);
3709 break;
3710 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN:
3711 len = sysfs_emit(buf, "%u\n", session->discovery_logout_en);
3712 break;
3713 case ISCSI_PARAM_BIDI_CHAP_EN:
3714 len = sysfs_emit(buf, "%u\n", session->bidi_chap_en);
3715 break;
3716 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL:
3717 len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional);
3718 break;
3719 case ISCSI_PARAM_DEF_TIME2WAIT:
3720 len = sysfs_emit(buf, "%d\n", session->time2wait);
3721 break;
3722 case ISCSI_PARAM_DEF_TIME2RETAIN:
3723 len = sysfs_emit(buf, "%d\n", session->time2retain);
3724 break;
3725 case ISCSI_PARAM_TSID:
3726 len = sysfs_emit(buf, "%u\n", session->tsid);
3727 break;
3728 case ISCSI_PARAM_ISID:
3729 len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n",
3730 session->isid[0], session->isid[1],
3731 session->isid[2], session->isid[3],
3732 session->isid[4], session->isid[5]);
3733 break;
3734 case ISCSI_PARAM_DISCOVERY_PARENT_IDX:
3735 len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx);
3736 break;
3737 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE:
3738 if (session->discovery_parent_type)
3739 len = sysfs_emit(buf, "%s\n",
3740 session->discovery_parent_type);
3741 else
3742 len = sysfs_emit(buf, "\n");
3743 break;
3744 default:
3745 return -ENOSYS;
3746 }
3747
3748 return len;
3749}
3750EXPORT_SYMBOL_GPL(iscsi_session_get_param);
3751
3752int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
3753 enum iscsi_param param, char *buf)
3754{
3755 struct sockaddr_in6 *sin6 = NULL;
3756 struct sockaddr_in *sin = NULL;
3757 int len;
3758
3759 switch (addr->ss_family) {
3760 case AF_INET:
3761 sin = (struct sockaddr_in *)addr;
3762 break;
3763 case AF_INET6:
3764 sin6 = (struct sockaddr_in6 *)addr;
3765 break;
3766 default:
3767 return -EINVAL;
3768 }
3769
3770 switch (param) {
3771 case ISCSI_PARAM_CONN_ADDRESS:
3772 case ISCSI_HOST_PARAM_IPADDRESS:
3773 if (sin)
3774 len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr);
3775 else
3776 len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr);
3777 break;
3778 case ISCSI_PARAM_CONN_PORT:
3779 case ISCSI_PARAM_LOCAL_PORT:
3780 if (sin)
3781 len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port));
3782 else
3783 len = sysfs_emit(buf, "%hu\n",
3784 be16_to_cpu(sin6->sin6_port));
3785 break;
3786 default:
3787 return -EINVAL;
3788 }
3789
3790 return len;
3791}
3792EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param);
3793
3794int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
3795 enum iscsi_param param, char *buf)
3796{
3797 struct iscsi_conn *conn = cls_conn->dd_data;
3798 int len;
3799
3800 switch(param) {
3801 case ISCSI_PARAM_PING_TMO:
3802 len = sysfs_emit(buf, "%u\n", conn->ping_timeout);
3803 break;
3804 case ISCSI_PARAM_RECV_TMO:
3805 len = sysfs_emit(buf, "%u\n", conn->recv_timeout);
3806 break;
3807 case ISCSI_PARAM_MAX_RECV_DLENGTH:
3808 len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength);
3809 break;
3810 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
3811 len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength);
3812 break;
3813 case ISCSI_PARAM_HDRDGST_EN:
3814 len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en);
3815 break;
3816 case ISCSI_PARAM_DATADGST_EN:
3817 len = sysfs_emit(buf, "%d\n", conn->datadgst_en);
3818 break;
3819 case ISCSI_PARAM_IFMARKER_EN:
3820 len = sysfs_emit(buf, "%d\n", conn->ifmarker_en);
3821 break;
3822 case ISCSI_PARAM_OFMARKER_EN:
3823 len = sysfs_emit(buf, "%d\n", conn->ofmarker_en);
3824 break;
3825 case ISCSI_PARAM_EXP_STATSN:
3826 len = sysfs_emit(buf, "%u\n", conn->exp_statsn);
3827 break;
3828 case ISCSI_PARAM_PERSISTENT_PORT:
3829 len = sysfs_emit(buf, "%d\n", conn->persistent_port);
3830 break;
3831 case ISCSI_PARAM_PERSISTENT_ADDRESS:
3832 len = sysfs_emit(buf, "%s\n", conn->persistent_address);
3833 break;
3834 case ISCSI_PARAM_STATSN:
3835 len = sysfs_emit(buf, "%u\n", conn->statsn);
3836 break;
3837 case ISCSI_PARAM_MAX_SEGMENT_SIZE:
3838 len = sysfs_emit(buf, "%u\n", conn->max_segment_size);
3839 break;
3840 case ISCSI_PARAM_KEEPALIVE_TMO:
3841 len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo);
3842 break;
3843 case ISCSI_PARAM_LOCAL_PORT:
3844 len = sysfs_emit(buf, "%u\n", conn->local_port);
3845 break;
3846 case ISCSI_PARAM_TCP_TIMESTAMP_STAT:
3847 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat);
3848 break;
3849 case ISCSI_PARAM_TCP_NAGLE_DISABLE:
3850 len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable);
3851 break;
3852 case ISCSI_PARAM_TCP_WSF_DISABLE:
3853 len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable);
3854 break;
3855 case ISCSI_PARAM_TCP_TIMER_SCALE:
3856 len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale);
3857 break;
3858 case ISCSI_PARAM_TCP_TIMESTAMP_EN:
3859 len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en);
3860 break;
3861 case ISCSI_PARAM_IP_FRAGMENT_DISABLE:
3862 len = sysfs_emit(buf, "%u\n", conn->fragment_disable);
3863 break;
3864 case ISCSI_PARAM_IPV4_TOS:
3865 len = sysfs_emit(buf, "%u\n", conn->ipv4_tos);
3866 break;
3867 case ISCSI_PARAM_IPV6_TC:
3868 len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class);
3869 break;
3870 case ISCSI_PARAM_IPV6_FLOW_LABEL:
3871 len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label);
3872 break;
3873 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6:
3874 len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6);
3875 break;
3876 case ISCSI_PARAM_TCP_XMIT_WSF:
3877 len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf);
3878 break;
3879 case ISCSI_PARAM_TCP_RECV_WSF:
3880 len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf);
3881 break;
3882 case ISCSI_PARAM_LOCAL_IPADDR:
3883 len = sysfs_emit(buf, "%s\n", conn->local_ipaddr);
3884 break;
3885 default:
3886 return -ENOSYS;
3887 }
3888
3889 return len;
3890}
3891EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
3892
3893int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3894 char *buf)
3895{
3896 struct iscsi_host *ihost = shost_priv(shost);
3897 int len;
3898
3899 switch (param) {
3900 case ISCSI_HOST_PARAM_NETDEV_NAME:
3901 len = sysfs_emit(buf, "%s\n", ihost->netdev);
3902 break;
3903 case ISCSI_HOST_PARAM_HWADDRESS:
3904 len = sysfs_emit(buf, "%s\n", ihost->hwaddress);
3905 break;
3906 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3907 len = sysfs_emit(buf, "%s\n", ihost->initiatorname);
3908 break;
3909 default:
3910 return -ENOSYS;
3911 }
3912
3913 return len;
3914}
3915EXPORT_SYMBOL_GPL(iscsi_host_get_param);
3916
3917int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
3918 char *buf, int buflen)
3919{
3920 struct iscsi_host *ihost = shost_priv(shost);
3921
3922 switch (param) {
3923 case ISCSI_HOST_PARAM_NETDEV_NAME:
3924 return iscsi_switch_str_param(&ihost->netdev, buf);
3925 case ISCSI_HOST_PARAM_HWADDRESS:
3926 return iscsi_switch_str_param(&ihost->hwaddress, buf);
3927 case ISCSI_HOST_PARAM_INITIATOR_NAME:
3928 return iscsi_switch_str_param(&ihost->initiatorname, buf);
3929 default:
3930 return -ENOSYS;
3931 }
3932
3933 return 0;
3934}
3935EXPORT_SYMBOL_GPL(iscsi_host_set_param);
3936
3937MODULE_AUTHOR("Mike Christie");
3938MODULE_DESCRIPTION("iSCSI library functions");
3939MODULE_LICENSE("GPL");