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