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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_util.c
blobe655b042ed1895cbb2390dfc2bc13adeed89d517
1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/list.h>
20 #include <linux/percpu_ida.h>
21 #include <scsi/scsi_tcq.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/target_core_configfs.h>
26 #include <target/iscsi/iscsi_transport.h>
27
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
39
40 #define PRINT_BUFF(buff, len) \
41 { \
42 int zzz; \
43 \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
47 if (zzz) \
48 pr_debug("\n"); \
49 pr_debug("%4i: ", zzz); \
50 } \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
52 } \
53 if ((len + 1) % 16) \
54 pr_debug("\n"); \
55 }
56
57 extern struct list_head g_tiqn_list;
58 extern spinlock_t tiqn_lock;
59
60 /*
61 * Called with cmd->r2t_lock held.
62 */
63 int iscsit_add_r2t_to_list(
64 struct iscsi_cmd *cmd,
65 u32 offset,
66 u32 xfer_len,
67 int recovery,
68 u32 r2t_sn)
69 {
70 struct iscsi_r2t *r2t;
71
72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
73 if (!r2t) {
74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
75 return -1;
76 }
77 INIT_LIST_HEAD(&r2t->r2t_list);
78
79 r2t->recovery_r2t = recovery;
80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
81 r2t->offset = offset;
82 r2t->xfer_len = xfer_len;
83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
84 spin_unlock_bh(&cmd->r2t_lock);
85
86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
87
88 spin_lock_bh(&cmd->r2t_lock);
89 return 0;
90 }
91
92 struct iscsi_r2t *iscsit_get_r2t_for_eos(
93 struct iscsi_cmd *cmd,
94 u32 offset,
95 u32 length)
96 {
97 struct iscsi_r2t *r2t;
98
99 spin_lock_bh(&cmd->r2t_lock);
100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
101 if ((r2t->offset <= offset) &&
102 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
103 spin_unlock_bh(&cmd->r2t_lock);
104 return r2t;
105 }
106 }
107 spin_unlock_bh(&cmd->r2t_lock);
108
109 pr_err("Unable to locate R2T for Offset: %u, Length:"
110 " %u\n", offset, length);
111 return NULL;
112 }
113
114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
115 {
116 struct iscsi_r2t *r2t;
117
118 spin_lock_bh(&cmd->r2t_lock);
119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
120 if (!r2t->sent_r2t) {
121 spin_unlock_bh(&cmd->r2t_lock);
122 return r2t;
123 }
124 }
125 spin_unlock_bh(&cmd->r2t_lock);
126
127 pr_err("Unable to locate next R2T to send for ITT:"
128 " 0x%08x.\n", cmd->init_task_tag);
129 return NULL;
130 }
131
132 /*
133 * Called with cmd->r2t_lock held.
134 */
135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
136 {
137 list_del(&r2t->r2t_list);
138 kmem_cache_free(lio_r2t_cache, r2t);
139 }
140
141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
142 {
143 struct iscsi_r2t *r2t, *r2t_tmp;
144
145 spin_lock_bh(&cmd->r2t_lock);
146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
147 iscsit_free_r2t(r2t, cmd);
148 spin_unlock_bh(&cmd->r2t_lock);
149 }
150
151 /*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
156 {
157 struct iscsi_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag;
160
161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
162 if (tag < 0)
163 return NULL;
164
165 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
166 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
167 memset(cmd, 0, size);
168
169 cmd->se_cmd.map_tag = tag;
170 cmd->conn = conn;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
179
180 return cmd;
181 }
182 EXPORT_SYMBOL(iscsit_allocate_cmd);
183
184 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
185 struct iscsi_cmd *cmd,
186 u32 seq_send_order)
187 {
188 u32 i;
189
190 for (i = 0; i < cmd->seq_count; i++)
191 if (cmd->seq_list[i].seq_send_order == seq_send_order)
192 return &cmd->seq_list[i];
193
194 return NULL;
195 }
196
197 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
198 {
199 u32 i;
200
201 if (!cmd->seq_list) {
202 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
203 return NULL;
204 }
205
206 for (i = 0; i < cmd->seq_count; i++) {
207 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
208 continue;
209 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
210 cmd->seq_send_order++;
211 return &cmd->seq_list[i];
212 }
213 }
214
215 return NULL;
216 }
217
218 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
219 struct iscsi_cmd *cmd,
220 u32 r2t_sn)
221 {
222 struct iscsi_r2t *r2t;
223
224 spin_lock_bh(&cmd->r2t_lock);
225 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
226 if (r2t->r2t_sn == r2t_sn) {
227 spin_unlock_bh(&cmd->r2t_lock);
228 return r2t;
229 }
230 }
231 spin_unlock_bh(&cmd->r2t_lock);
232
233 return NULL;
234 }
235
236 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
237 {
238 int ret;
239
240 /*
241 * This is the proper method of checking received CmdSN against
242 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
243 * or order CmdSNs due to multiple connection sessions and/or
244 * CRC failures.
245 */
246 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
247 pr_err("Received CmdSN: 0x%08x is greater than"
248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
249 sess->max_cmd_sn);
250 ret = CMDSN_MAXCMDSN_OVERRUN;
251
252 } else if (cmdsn == sess->exp_cmd_sn) {
253 sess->exp_cmd_sn++;
254 pr_debug("Received CmdSN matches ExpCmdSN,"
255 " incremented ExpCmdSN to: 0x%08x\n",
256 sess->exp_cmd_sn);
257 ret = CMDSN_NORMAL_OPERATION;
258
259 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
260 pr_debug("Received CmdSN: 0x%08x is greater"
261 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
262 cmdsn, sess->exp_cmd_sn);
263 ret = CMDSN_HIGHER_THAN_EXP;
264
265 } else {
266 pr_err("Received CmdSN: 0x%08x is less than"
267 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
268 sess->exp_cmd_sn);
269 ret = CMDSN_LOWER_THAN_EXP;
270 }
271
272 return ret;
273 }
274
275 /*
276 * Commands may be received out of order if MC/S is in use.
277 * Ensure they are executed in CmdSN order.
278 */
279 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
280 unsigned char *buf, __be32 cmdsn)
281 {
282 int ret, cmdsn_ret;
283 bool reject = false;
284 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
285
286 mutex_lock(&conn->sess->cmdsn_mutex);
287
288 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
289 switch (cmdsn_ret) {
290 case CMDSN_NORMAL_OPERATION:
291 ret = iscsit_execute_cmd(cmd, 0);
292 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
293 iscsit_execute_ooo_cmdsns(conn->sess);
294 else if (ret < 0) {
295 reject = true;
296 ret = CMDSN_ERROR_CANNOT_RECOVER;
297 }
298 break;
299 case CMDSN_HIGHER_THAN_EXP:
300 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
301 if (ret < 0) {
302 reject = true;
303 ret = CMDSN_ERROR_CANNOT_RECOVER;
304 break;
305 }
306 ret = CMDSN_HIGHER_THAN_EXP;
307 break;
308 case CMDSN_LOWER_THAN_EXP:
309 case CMDSN_MAXCMDSN_OVERRUN:
310 default:
311 cmd->i_state = ISTATE_REMOVE;
312 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
313 /*
314 * Existing callers for iscsit_sequence_cmd() will silently
315 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
316 * return for CMDSN_MAXCMDSN_OVERRUN as well..
317 */
318 ret = CMDSN_LOWER_THAN_EXP;
319 break;
320 }
321 mutex_unlock(&conn->sess->cmdsn_mutex);
322
323 if (reject)
324 iscsit_reject_cmd(cmd, reason, buf);
325
326 return ret;
327 }
328 EXPORT_SYMBOL(iscsit_sequence_cmd);
329
330 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
331 {
332 struct iscsi_conn *conn = cmd->conn;
333 struct se_cmd *se_cmd = &cmd->se_cmd;
334 struct iscsi_data *hdr = (struct iscsi_data *) buf;
335 u32 payload_length = ntoh24(hdr->dlength);
336
337 if (conn->sess->sess_ops->InitialR2T) {
338 pr_err("Received unexpected unsolicited data"
339 " while InitialR2T=Yes, protocol error.\n");
340 transport_send_check_condition_and_sense(se_cmd,
341 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
342 return -1;
343 }
344
345 if ((cmd->first_burst_len + payload_length) >
346 conn->sess->sess_ops->FirstBurstLength) {
347 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
348 " for this Unsolicited DataOut Burst.\n",
349 (cmd->first_burst_len + payload_length),
350 conn->sess->sess_ops->FirstBurstLength);
351 transport_send_check_condition_and_sense(se_cmd,
352 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
353 return -1;
354 }
355
356 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
357 return 0;
358
359 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
360 ((cmd->first_burst_len + payload_length) !=
361 conn->sess->sess_ops->FirstBurstLength)) {
362 pr_err("Unsolicited non-immediate data received %u"
363 " does not equal FirstBurstLength: %u, and does"
364 " not equal ExpXferLen %u.\n",
365 (cmd->first_burst_len + payload_length),
366 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
367 transport_send_check_condition_and_sense(se_cmd,
368 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
369 return -1;
370 }
371 return 0;
372 }
373
374 struct iscsi_cmd *iscsit_find_cmd_from_itt(
375 struct iscsi_conn *conn,
376 itt_t init_task_tag)
377 {
378 struct iscsi_cmd *cmd;
379
380 spin_lock_bh(&conn->cmd_lock);
381 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
382 if (cmd->init_task_tag == init_task_tag) {
383 spin_unlock_bh(&conn->cmd_lock);
384 return cmd;
385 }
386 }
387 spin_unlock_bh(&conn->cmd_lock);
388
389 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
390 init_task_tag, conn->cid);
391 return NULL;
392 }
393
394 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
396 itt_t init_task_tag,
397 u32 length)
398 {
399 struct iscsi_cmd *cmd;
400
401 spin_lock_bh(&conn->cmd_lock);
402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
403 if (cmd->init_task_tag == init_task_tag) {
404 spin_unlock_bh(&conn->cmd_lock);
405 return cmd;
406 }
407 }
408 spin_unlock_bh(&conn->cmd_lock);
409
410 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
411 " dumping payload\n", init_task_tag, conn->cid);
412 if (length)
413 iscsit_dump_data_payload(conn, length, 1);
414
415 return NULL;
416 }
417
418 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
419 struct iscsi_conn *conn,
420 u32 targ_xfer_tag)
421 {
422 struct iscsi_cmd *cmd = NULL;
423
424 spin_lock_bh(&conn->cmd_lock);
425 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
426 if (cmd->targ_xfer_tag == targ_xfer_tag) {
427 spin_unlock_bh(&conn->cmd_lock);
428 return cmd;
429 }
430 }
431 spin_unlock_bh(&conn->cmd_lock);
432
433 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
434 targ_xfer_tag, conn->cid);
435 return NULL;
436 }
437
438 int iscsit_find_cmd_for_recovery(
439 struct iscsi_session *sess,
440 struct iscsi_cmd **cmd_ptr,
441 struct iscsi_conn_recovery **cr_ptr,
442 itt_t init_task_tag)
443 {
444 struct iscsi_cmd *cmd = NULL;
445 struct iscsi_conn_recovery *cr;
446 /*
447 * Scan through the inactive connection recovery list's command list.
448 * If init_task_tag matches the command is still alligent.
449 */
450 spin_lock(&sess->cr_i_lock);
451 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
452 spin_lock(&cr->conn_recovery_cmd_lock);
453 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
454 if (cmd->init_task_tag == init_task_tag) {
455 spin_unlock(&cr->conn_recovery_cmd_lock);
456 spin_unlock(&sess->cr_i_lock);
457
458 *cr_ptr = cr;
459 *cmd_ptr = cmd;
460 return -2;
461 }
462 }
463 spin_unlock(&cr->conn_recovery_cmd_lock);
464 }
465 spin_unlock(&sess->cr_i_lock);
466 /*
467 * Scan through the active connection recovery list's command list.
468 * If init_task_tag matches the command is ready to be reassigned.
469 */
470 spin_lock(&sess->cr_a_lock);
471 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
472 spin_lock(&cr->conn_recovery_cmd_lock);
473 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
474 if (cmd->init_task_tag == init_task_tag) {
475 spin_unlock(&cr->conn_recovery_cmd_lock);
476 spin_unlock(&sess->cr_a_lock);
477
478 *cr_ptr = cr;
479 *cmd_ptr = cmd;
480 return 0;
481 }
482 }
483 spin_unlock(&cr->conn_recovery_cmd_lock);
484 }
485 spin_unlock(&sess->cr_a_lock);
486
487 return -1;
488 }
489
490 void iscsit_add_cmd_to_immediate_queue(
491 struct iscsi_cmd *cmd,
492 struct iscsi_conn *conn,
493 u8 state)
494 {
495 struct iscsi_queue_req *qr;
496
497 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
498 if (!qr) {
499 pr_err("Unable to allocate memory for"
500 " struct iscsi_queue_req\n");
501 return;
502 }
503 INIT_LIST_HEAD(&qr->qr_list);
504 qr->cmd = cmd;
505 qr->state = state;
506
507 spin_lock_bh(&conn->immed_queue_lock);
508 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
509 atomic_inc(&cmd->immed_queue_count);
510 atomic_set(&conn->check_immediate_queue, 1);
511 spin_unlock_bh(&conn->immed_queue_lock);
512
513 wake_up(&conn->queues_wq);
514 }
515
516 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
517 {
518 struct iscsi_queue_req *qr;
519
520 spin_lock_bh(&conn->immed_queue_lock);
521 if (list_empty(&conn->immed_queue_list)) {
522 spin_unlock_bh(&conn->immed_queue_lock);
523 return NULL;
524 }
525 qr = list_first_entry(&conn->immed_queue_list,
526 struct iscsi_queue_req, qr_list);
527
528 list_del(&qr->qr_list);
529 if (qr->cmd)
530 atomic_dec(&qr->cmd->immed_queue_count);
531 spin_unlock_bh(&conn->immed_queue_lock);
532
533 return qr;
534 }
535
536 static void iscsit_remove_cmd_from_immediate_queue(
537 struct iscsi_cmd *cmd,
538 struct iscsi_conn *conn)
539 {
540 struct iscsi_queue_req *qr, *qr_tmp;
541
542 spin_lock_bh(&conn->immed_queue_lock);
543 if (!atomic_read(&cmd->immed_queue_count)) {
544 spin_unlock_bh(&conn->immed_queue_lock);
545 return;
546 }
547
548 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
549 if (qr->cmd != cmd)
550 continue;
551
552 atomic_dec(&qr->cmd->immed_queue_count);
553 list_del(&qr->qr_list);
554 kmem_cache_free(lio_qr_cache, qr);
555 }
556 spin_unlock_bh(&conn->immed_queue_lock);
557
558 if (atomic_read(&cmd->immed_queue_count)) {
559 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
560 cmd->init_task_tag,
561 atomic_read(&cmd->immed_queue_count));
562 }
563 }
564
565 void iscsit_add_cmd_to_response_queue(
566 struct iscsi_cmd *cmd,
567 struct iscsi_conn *conn,
568 u8 state)
569 {
570 struct iscsi_queue_req *qr;
571
572 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
573 if (!qr) {
574 pr_err("Unable to allocate memory for"
575 " struct iscsi_queue_req\n");
576 return;
577 }
578 INIT_LIST_HEAD(&qr->qr_list);
579 qr->cmd = cmd;
580 qr->state = state;
581
582 spin_lock_bh(&conn->response_queue_lock);
583 list_add_tail(&qr->qr_list, &conn->response_queue_list);
584 atomic_inc(&cmd->response_queue_count);
585 spin_unlock_bh(&conn->response_queue_lock);
586
587 wake_up(&conn->queues_wq);
588 }
589
590 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
591 {
592 struct iscsi_queue_req *qr;
593
594 spin_lock_bh(&conn->response_queue_lock);
595 if (list_empty(&conn->response_queue_list)) {
596 spin_unlock_bh(&conn->response_queue_lock);
597 return NULL;
598 }
599
600 qr = list_first_entry(&conn->response_queue_list,
601 struct iscsi_queue_req, qr_list);
602
603 list_del(&qr->qr_list);
604 if (qr->cmd)
605 atomic_dec(&qr->cmd->response_queue_count);
606 spin_unlock_bh(&conn->response_queue_lock);
607
608 return qr;
609 }
610
611 static void iscsit_remove_cmd_from_response_queue(
612 struct iscsi_cmd *cmd,
613 struct iscsi_conn *conn)
614 {
615 struct iscsi_queue_req *qr, *qr_tmp;
616
617 spin_lock_bh(&conn->response_queue_lock);
618 if (!atomic_read(&cmd->response_queue_count)) {
619 spin_unlock_bh(&conn->response_queue_lock);
620 return;
621 }
622
623 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
624 qr_list) {
625 if (qr->cmd != cmd)
626 continue;
627
628 atomic_dec(&qr->cmd->response_queue_count);
629 list_del(&qr->qr_list);
630 kmem_cache_free(lio_qr_cache, qr);
631 }
632 spin_unlock_bh(&conn->response_queue_lock);
633
634 if (atomic_read(&cmd->response_queue_count)) {
635 pr_err("ITT: 0x%08x response_queue_count: %d\n",
636 cmd->init_task_tag,
637 atomic_read(&cmd->response_queue_count));
638 }
639 }
640
641 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
642 {
643 bool empty;
644
645 spin_lock_bh(&conn->immed_queue_lock);
646 empty = list_empty(&conn->immed_queue_list);
647 spin_unlock_bh(&conn->immed_queue_lock);
648
649 if (!empty)
650 return empty;
651
652 spin_lock_bh(&conn->response_queue_lock);
653 empty = list_empty(&conn->response_queue_list);
654 spin_unlock_bh(&conn->response_queue_lock);
655
656 return empty;
657 }
658
659 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
660 {
661 struct iscsi_queue_req *qr, *qr_tmp;
662
663 spin_lock_bh(&conn->immed_queue_lock);
664 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
665 list_del(&qr->qr_list);
666 if (qr->cmd)
667 atomic_dec(&qr->cmd->immed_queue_count);
668
669 kmem_cache_free(lio_qr_cache, qr);
670 }
671 spin_unlock_bh(&conn->immed_queue_lock);
672
673 spin_lock_bh(&conn->response_queue_lock);
674 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
675 qr_list) {
676 list_del(&qr->qr_list);
677 if (qr->cmd)
678 atomic_dec(&qr->cmd->response_queue_count);
679
680 kmem_cache_free(lio_qr_cache, qr);
681 }
682 spin_unlock_bh(&conn->response_queue_lock);
683 }
684
685 void iscsit_release_cmd(struct iscsi_cmd *cmd)
686 {
687 struct iscsi_session *sess;
688 struct se_cmd *se_cmd = &cmd->se_cmd;
689
690 if (cmd->conn)
691 sess = cmd->conn->sess;
692 else
693 sess = cmd->sess;
694
695 BUG_ON(!sess || !sess->se_sess);
696
697 kfree(cmd->buf_ptr);
698 kfree(cmd->pdu_list);
699 kfree(cmd->seq_list);
700 kfree(cmd->tmr_req);
701 kfree(cmd->iov_data);
702 kfree(cmd->text_in_ptr);
703
704 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
705 }
706 EXPORT_SYMBOL(iscsit_release_cmd);
707
708 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
709 bool check_queues)
710 {
711 struct iscsi_conn *conn = cmd->conn;
712
713 if (scsi_cmd) {
714 if (cmd->data_direction == DMA_TO_DEVICE) {
715 iscsit_stop_dataout_timer(cmd);
716 iscsit_free_r2ts_from_list(cmd);
717 }
718 if (cmd->data_direction == DMA_FROM_DEVICE)
719 iscsit_free_all_datain_reqs(cmd);
720 }
721
722 if (conn && check_queues) {
723 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
724 iscsit_remove_cmd_from_response_queue(cmd, conn);
725 }
726 }
727
728 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
729 {
730 struct se_cmd *se_cmd = NULL;
731 int rc;
732 /*
733 * Determine if a struct se_cmd is associated with
734 * this struct iscsi_cmd.
735 */
736 switch (cmd->iscsi_opcode) {
737 case ISCSI_OP_SCSI_CMD:
738 se_cmd = &cmd->se_cmd;
739 __iscsit_free_cmd(cmd, true, shutdown);
740 /*
741 * Fallthrough
742 */
743 case ISCSI_OP_SCSI_TMFUNC:
744 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
745 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
746 __iscsit_free_cmd(cmd, true, shutdown);
747 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
748 }
749 break;
750 case ISCSI_OP_REJECT:
751 /*
752 * Handle special case for REJECT when iscsi_add_reject*() has
753 * overwritten the original iscsi_opcode assignment, and the
754 * associated cmd->se_cmd needs to be released.
755 */
756 if (cmd->se_cmd.se_tfo != NULL) {
757 se_cmd = &cmd->se_cmd;
758 __iscsit_free_cmd(cmd, true, shutdown);
759
760 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
761 if (!rc && shutdown && se_cmd->se_sess) {
762 __iscsit_free_cmd(cmd, true, shutdown);
763 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
764 }
765 break;
766 }
767 /* Fall-through */
768 default:
769 __iscsit_free_cmd(cmd, false, shutdown);
770 iscsit_release_cmd(cmd);
771 break;
772 }
773 }
774
775 int iscsit_check_session_usage_count(struct iscsi_session *sess)
776 {
777 spin_lock_bh(&sess->session_usage_lock);
778 if (sess->session_usage_count != 0) {
779 sess->session_waiting_on_uc = 1;
780 spin_unlock_bh(&sess->session_usage_lock);
781 if (in_interrupt())
782 return 2;
783
784 wait_for_completion(&sess->session_waiting_on_uc_comp);
785 return 1;
786 }
787 spin_unlock_bh(&sess->session_usage_lock);
788
789 return 0;
790 }
791
792 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
793 {
794 spin_lock_bh(&sess->session_usage_lock);
795 sess->session_usage_count--;
796
797 if (!sess->session_usage_count && sess->session_waiting_on_uc)
798 complete(&sess->session_waiting_on_uc_comp);
799
800 spin_unlock_bh(&sess->session_usage_lock);
801 }
802
803 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
804 {
805 spin_lock_bh(&sess->session_usage_lock);
806 sess->session_usage_count++;
807 spin_unlock_bh(&sess->session_usage_lock);
808 }
809
810 /*
811 * Setup conn->if_marker and conn->of_marker values based upon
812 * the initial marker-less interval. (see iSCSI v19 A.2)
813 */
814 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
815 {
816 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
817 /*
818 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
819 */
820 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
821 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
822
823 if (conn->conn_ops->OFMarker) {
824 /*
825 * Account for the first Login Command received not
826 * via iscsi_recv_msg().
827 */
828 conn->of_marker += ISCSI_HDR_LEN;
829 if (conn->of_marker <= OFMarkInt) {
830 conn->of_marker = (OFMarkInt - conn->of_marker);
831 } else {
832 login_ofmarker_count = (conn->of_marker / OFMarkInt);
833 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
834 (login_ofmarker_count * MARKER_SIZE);
835 conn->of_marker = (next_marker - conn->of_marker);
836 }
837 conn->of_marker_offset = 0;
838 pr_debug("Setting OFMarker value to %u based on Initial"
839 " Markerless Interval.\n", conn->of_marker);
840 }
841
842 if (conn->conn_ops->IFMarker) {
843 if (conn->if_marker <= IFMarkInt) {
844 conn->if_marker = (IFMarkInt - conn->if_marker);
845 } else {
846 login_ifmarker_count = (conn->if_marker / IFMarkInt);
847 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
848 (login_ifmarker_count * MARKER_SIZE);
849 conn->if_marker = (next_marker - conn->if_marker);
850 }
851 pr_debug("Setting IFMarker value to %u based on Initial"
852 " Markerless Interval.\n", conn->if_marker);
853 }
854
855 return 0;
856 }
857
858 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
859 {
860 struct iscsi_conn *conn;
861
862 spin_lock_bh(&sess->conn_lock);
863 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
864 if ((conn->cid == cid) &&
865 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
866 iscsit_inc_conn_usage_count(conn);
867 spin_unlock_bh(&sess->conn_lock);
868 return conn;
869 }
870 }
871 spin_unlock_bh(&sess->conn_lock);
872
873 return NULL;
874 }
875
876 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
877 {
878 struct iscsi_conn *conn;
879
880 spin_lock_bh(&sess->conn_lock);
881 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
882 if (conn->cid == cid) {
883 iscsit_inc_conn_usage_count(conn);
884 spin_lock(&conn->state_lock);
885 atomic_set(&conn->connection_wait_rcfr, 1);
886 spin_unlock(&conn->state_lock);
887 spin_unlock_bh(&sess->conn_lock);
888 return conn;
889 }
890 }
891 spin_unlock_bh(&sess->conn_lock);
892
893 return NULL;
894 }
895
896 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
897 {
898 spin_lock_bh(&conn->conn_usage_lock);
899 if (conn->conn_usage_count != 0) {
900 conn->conn_waiting_on_uc = 1;
901 spin_unlock_bh(&conn->conn_usage_lock);
902
903 wait_for_completion(&conn->conn_waiting_on_uc_comp);
904 return;
905 }
906 spin_unlock_bh(&conn->conn_usage_lock);
907 }
908
909 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
910 {
911 spin_lock_bh(&conn->conn_usage_lock);
912 conn->conn_usage_count--;
913
914 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
915 complete(&conn->conn_waiting_on_uc_comp);
916
917 spin_unlock_bh(&conn->conn_usage_lock);
918 }
919
920 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
921 {
922 spin_lock_bh(&conn->conn_usage_lock);
923 conn->conn_usage_count++;
924 spin_unlock_bh(&conn->conn_usage_lock);
925 }
926
927 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
928 {
929 u8 state;
930 struct iscsi_cmd *cmd;
931
932 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
933 if (!cmd)
934 return -1;
935
936 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
937 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
938 ISTATE_SEND_NOPIN_NO_RESPONSE;
939 cmd->init_task_tag = RESERVED_ITT;
940 spin_lock_bh(&conn->sess->ttt_lock);
941 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
942 0xFFFFFFFF;
943 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
944 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
945 spin_unlock_bh(&conn->sess->ttt_lock);
946
947 spin_lock_bh(&conn->cmd_lock);
948 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
949 spin_unlock_bh(&conn->cmd_lock);
950
951 if (want_response)
952 iscsit_start_nopin_response_timer(conn);
953 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
954
955 return 0;
956 }
957
958 static void iscsit_handle_nopin_response_timeout(unsigned long data)
959 {
960 struct iscsi_conn *conn = (struct iscsi_conn *) data;
961
962 iscsit_inc_conn_usage_count(conn);
963
964 spin_lock_bh(&conn->nopin_timer_lock);
965 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
966 spin_unlock_bh(&conn->nopin_timer_lock);
967 iscsit_dec_conn_usage_count(conn);
968 return;
969 }
970
971 pr_debug("Did not receive response to NOPIN on CID: %hu on"
972 " SID: %u, failing connection.\n", conn->cid,
973 conn->sess->sid);
974 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
975 spin_unlock_bh(&conn->nopin_timer_lock);
976
977 {
978 struct iscsi_portal_group *tpg = conn->sess->tpg;
979 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
980
981 if (tiqn) {
982 spin_lock_bh(&tiqn->sess_err_stats.lock);
983 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
984 conn->sess->sess_ops->InitiatorName);
985 tiqn->sess_err_stats.last_sess_failure_type =
986 ISCSI_SESS_ERR_CXN_TIMEOUT;
987 tiqn->sess_err_stats.cxn_timeout_errors++;
988 atomic_long_inc(&conn->sess->conn_timeout_errors);
989 spin_unlock_bh(&tiqn->sess_err_stats.lock);
990 }
991 }
992
993 iscsit_cause_connection_reinstatement(conn, 0);
994 iscsit_dec_conn_usage_count(conn);
995 }
996
997 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
998 {
999 struct iscsi_session *sess = conn->sess;
1000 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1001
1002 spin_lock_bh(&conn->nopin_timer_lock);
1003 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1004 spin_unlock_bh(&conn->nopin_timer_lock);
1005 return;
1006 }
1007
1008 mod_timer(&conn->nopin_response_timer,
1009 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1010 spin_unlock_bh(&conn->nopin_timer_lock);
1011 }
1012
1013 /*
1014 * Called with conn->nopin_timer_lock held.
1015 */
1016 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1017 {
1018 struct iscsi_session *sess = conn->sess;
1019 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1020
1021 spin_lock_bh(&conn->nopin_timer_lock);
1022 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1023 spin_unlock_bh(&conn->nopin_timer_lock);
1024 return;
1025 }
1026
1027 init_timer(&conn->nopin_response_timer);
1028 conn->nopin_response_timer.expires =
1029 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1030 conn->nopin_response_timer.data = (unsigned long)conn;
1031 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1032 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1033 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1034 add_timer(&conn->nopin_response_timer);
1035
1036 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1037 " seconds\n", conn->cid, na->nopin_response_timeout);
1038 spin_unlock_bh(&conn->nopin_timer_lock);
1039 }
1040
1041 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1042 {
1043 spin_lock_bh(&conn->nopin_timer_lock);
1044 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1045 spin_unlock_bh(&conn->nopin_timer_lock);
1046 return;
1047 }
1048 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1049 spin_unlock_bh(&conn->nopin_timer_lock);
1050
1051 del_timer_sync(&conn->nopin_response_timer);
1052
1053 spin_lock_bh(&conn->nopin_timer_lock);
1054 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1055 spin_unlock_bh(&conn->nopin_timer_lock);
1056 }
1057
1058 static void iscsit_handle_nopin_timeout(unsigned long data)
1059 {
1060 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1061
1062 iscsit_inc_conn_usage_count(conn);
1063
1064 spin_lock_bh(&conn->nopin_timer_lock);
1065 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1067 iscsit_dec_conn_usage_count(conn);
1068 return;
1069 }
1070 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1071 spin_unlock_bh(&conn->nopin_timer_lock);
1072
1073 iscsit_add_nopin(conn, 1);
1074 iscsit_dec_conn_usage_count(conn);
1075 }
1076
1077 /*
1078 * Called with conn->nopin_timer_lock held.
1079 */
1080 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1081 {
1082 struct iscsi_session *sess = conn->sess;
1083 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1084 /*
1085 * NOPIN timeout is disabled.
1086 */
1087 if (!na->nopin_timeout)
1088 return;
1089
1090 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1091 return;
1092
1093 init_timer(&conn->nopin_timer);
1094 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1095 conn->nopin_timer.data = (unsigned long)conn;
1096 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1097 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1098 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1099 add_timer(&conn->nopin_timer);
1100
1101 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1102 " interval\n", conn->cid, na->nopin_timeout);
1103 }
1104
1105 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1106 {
1107 struct iscsi_session *sess = conn->sess;
1108 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1109 /*
1110 * NOPIN timeout is disabled..
1111 */
1112 if (!na->nopin_timeout)
1113 return;
1114
1115 spin_lock_bh(&conn->nopin_timer_lock);
1116 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1117 spin_unlock_bh(&conn->nopin_timer_lock);
1118 return;
1119 }
1120
1121 init_timer(&conn->nopin_timer);
1122 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1123 conn->nopin_timer.data = (unsigned long)conn;
1124 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1125 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1126 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1127 add_timer(&conn->nopin_timer);
1128
1129 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1130 " interval\n", conn->cid, na->nopin_timeout);
1131 spin_unlock_bh(&conn->nopin_timer_lock);
1132 }
1133
1134 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1135 {
1136 spin_lock_bh(&conn->nopin_timer_lock);
1137 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1138 spin_unlock_bh(&conn->nopin_timer_lock);
1139 return;
1140 }
1141 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1142 spin_unlock_bh(&conn->nopin_timer_lock);
1143
1144 del_timer_sync(&conn->nopin_timer);
1145
1146 spin_lock_bh(&conn->nopin_timer_lock);
1147 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1148 spin_unlock_bh(&conn->nopin_timer_lock);
1149 }
1150
1151 int iscsit_send_tx_data(
1152 struct iscsi_cmd *cmd,
1153 struct iscsi_conn *conn,
1154 int use_misc)
1155 {
1156 int tx_sent, tx_size;
1157 u32 iov_count;
1158 struct kvec *iov;
1159
1160 send_data:
1161 tx_size = cmd->tx_size;
1162
1163 if (!use_misc) {
1164 iov = &cmd->iov_data[0];
1165 iov_count = cmd->iov_data_count;
1166 } else {
1167 iov = &cmd->iov_misc[0];
1168 iov_count = cmd->iov_misc_count;
1169 }
1170
1171 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1172 if (tx_size != tx_sent) {
1173 if (tx_sent == -EAGAIN) {
1174 pr_err("tx_data() returned -EAGAIN\n");
1175 goto send_data;
1176 } else
1177 return -1;
1178 }
1179 cmd->tx_size = 0;
1180
1181 return 0;
1182 }
1183
1184 int iscsit_fe_sendpage_sg(
1185 struct iscsi_cmd *cmd,
1186 struct iscsi_conn *conn)
1187 {
1188 struct scatterlist *sg = cmd->first_data_sg;
1189 struct kvec iov;
1190 u32 tx_hdr_size, data_len;
1191 u32 offset = cmd->first_data_sg_off;
1192 int tx_sent, iov_off;
1193
1194 send_hdr:
1195 tx_hdr_size = ISCSI_HDR_LEN;
1196 if (conn->conn_ops->HeaderDigest)
1197 tx_hdr_size += ISCSI_CRC_LEN;
1198
1199 iov.iov_base = cmd->pdu;
1200 iov.iov_len = tx_hdr_size;
1201
1202 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1203 if (tx_hdr_size != tx_sent) {
1204 if (tx_sent == -EAGAIN) {
1205 pr_err("tx_data() returned -EAGAIN\n");
1206 goto send_hdr;
1207 }
1208 return -1;
1209 }
1210
1211 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1212 /*
1213 * Set iov_off used by padding and data digest tx_data() calls below
1214 * in order to determine proper offset into cmd->iov_data[]
1215 */
1216 if (conn->conn_ops->DataDigest) {
1217 data_len -= ISCSI_CRC_LEN;
1218 if (cmd->padding)
1219 iov_off = (cmd->iov_data_count - 2);
1220 else
1221 iov_off = (cmd->iov_data_count - 1);
1222 } else {
1223 iov_off = (cmd->iov_data_count - 1);
1224 }
1225 /*
1226 * Perform sendpage() for each page in the scatterlist
1227 */
1228 while (data_len) {
1229 u32 space = (sg->length - offset);
1230 u32 sub_len = min_t(u32, data_len, space);
1231 send_pg:
1232 tx_sent = conn->sock->ops->sendpage(conn->sock,
1233 sg_page(sg), sg->offset + offset, sub_len, 0);
1234 if (tx_sent != sub_len) {
1235 if (tx_sent == -EAGAIN) {
1236 pr_err("tcp_sendpage() returned"
1237 " -EAGAIN\n");
1238 goto send_pg;
1239 }
1240
1241 pr_err("tcp_sendpage() failure: %d\n",
1242 tx_sent);
1243 return -1;
1244 }
1245
1246 data_len -= sub_len;
1247 offset = 0;
1248 sg = sg_next(sg);
1249 }
1250
1251 send_padding:
1252 if (cmd->padding) {
1253 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1254
1255 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1256 if (cmd->padding != tx_sent) {
1257 if (tx_sent == -EAGAIN) {
1258 pr_err("tx_data() returned -EAGAIN\n");
1259 goto send_padding;
1260 }
1261 return -1;
1262 }
1263 }
1264
1265 send_datacrc:
1266 if (conn->conn_ops->DataDigest) {
1267 struct kvec *iov_d = &cmd->iov_data[iov_off];
1268
1269 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1270 if (ISCSI_CRC_LEN != tx_sent) {
1271 if (tx_sent == -EAGAIN) {
1272 pr_err("tx_data() returned -EAGAIN\n");
1273 goto send_datacrc;
1274 }
1275 return -1;
1276 }
1277 }
1278
1279 return 0;
1280 }
1281
1282 /*
1283 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1284 * back to the Initiator when an expection condition occurs with the
1285 * errors set in status_class and status_detail.
1286 *
1287 * Parameters: iSCSI Connection, Status Class, Status Detail.
1288 * Returns: 0 on success, -1 on error.
1289 */
1290 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1291 {
1292 struct iscsi_login_rsp *hdr;
1293 struct iscsi_login *login = conn->conn_login;
1294
1295 login->login_failed = 1;
1296 iscsit_collect_login_stats(conn, status_class, status_detail);
1297
1298 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1299 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1300 hdr->status_class = status_class;
1301 hdr->status_detail = status_detail;
1302 hdr->itt = conn->login_itt;
1303
1304 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1305 }
1306
1307 void iscsit_print_session_params(struct iscsi_session *sess)
1308 {
1309 struct iscsi_conn *conn;
1310
1311 pr_debug("-----------------------------[Session Params for"
1312 " SID: %u]-----------------------------\n", sess->sid);
1313 spin_lock_bh(&sess->conn_lock);
1314 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1315 iscsi_dump_conn_ops(conn->conn_ops);
1316 spin_unlock_bh(&sess->conn_lock);
1317
1318 iscsi_dump_sess_ops(sess->sess_ops);
1319 }
1320
1321 static int iscsit_do_rx_data(
1322 struct iscsi_conn *conn,
1323 struct iscsi_data_count *count)
1324 {
1325 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1326 struct kvec *iov_p;
1327 struct msghdr msg;
1328
1329 if (!conn || !conn->sock || !conn->conn_ops)
1330 return -1;
1331
1332 memset(&msg, 0, sizeof(struct msghdr));
1333
1334 iov_p = count->iov;
1335 iov_len = count->iov_count;
1336
1337 while (total_rx < data) {
1338 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1339 (data - total_rx), MSG_WAITALL);
1340 if (rx_loop <= 0) {
1341 pr_debug("rx_loop: %d total_rx: %d\n",
1342 rx_loop, total_rx);
1343 return rx_loop;
1344 }
1345 total_rx += rx_loop;
1346 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1347 rx_loop, total_rx, data);
1348 }
1349
1350 return total_rx;
1351 }
1352
1353 static int iscsit_do_tx_data(
1354 struct iscsi_conn *conn,
1355 struct iscsi_data_count *count)
1356 {
1357 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1358 struct kvec *iov_p;
1359 struct msghdr msg;
1360
1361 if (!conn || !conn->sock || !conn->conn_ops)
1362 return -1;
1363
1364 if (data <= 0) {
1365 pr_err("Data length is: %d\n", data);
1366 return -1;
1367 }
1368
1369 memset(&msg, 0, sizeof(struct msghdr));
1370
1371 iov_p = count->iov;
1372 iov_len = count->iov_count;
1373
1374 while (total_tx < data) {
1375 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1376 (data - total_tx));
1377 if (tx_loop <= 0) {
1378 pr_debug("tx_loop: %d total_tx %d\n",
1379 tx_loop, total_tx);
1380 return tx_loop;
1381 }
1382 total_tx += tx_loop;
1383 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1384 tx_loop, total_tx, data);
1385 }
1386
1387 return total_tx;
1388 }
1389
1390 int rx_data(
1391 struct iscsi_conn *conn,
1392 struct kvec *iov,
1393 int iov_count,
1394 int data)
1395 {
1396 struct iscsi_data_count c;
1397
1398 if (!conn || !conn->sock || !conn->conn_ops)
1399 return -1;
1400
1401 memset(&c, 0, sizeof(struct iscsi_data_count));
1402 c.iov = iov;
1403 c.iov_count = iov_count;
1404 c.data_length = data;
1405 c.type = ISCSI_RX_DATA;
1406
1407 return iscsit_do_rx_data(conn, &c);
1408 }
1409
1410 int tx_data(
1411 struct iscsi_conn *conn,
1412 struct kvec *iov,
1413 int iov_count,
1414 int data)
1415 {
1416 struct iscsi_data_count c;
1417
1418 if (!conn || !conn->sock || !conn->conn_ops)
1419 return -1;
1420
1421 memset(&c, 0, sizeof(struct iscsi_data_count));
1422 c.iov = iov;
1423 c.iov_count = iov_count;
1424 c.data_length = data;
1425 c.type = ISCSI_TX_DATA;
1426
1427 return iscsit_do_tx_data(conn, &c);
1428 }
1429
1430 void iscsit_collect_login_stats(
1431 struct iscsi_conn *conn,
1432 u8 status_class,
1433 u8 status_detail)
1434 {
1435 struct iscsi_param *intrname = NULL;
1436 struct iscsi_tiqn *tiqn;
1437 struct iscsi_login_stats *ls;
1438
1439 tiqn = iscsit_snmp_get_tiqn(conn);
1440 if (!tiqn)
1441 return;
1442
1443 ls = &tiqn->login_stats;
1444
1445 spin_lock(&ls->lock);
1446 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1447 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1448 /* We already have the failure info for this login */
1449 spin_unlock(&ls->lock);
1450 return;
1451 }
1452
1453 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1454 ls->accepts++;
1455 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1456 ls->redirects++;
1457 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1458 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1459 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1460 ls->authenticate_fails++;
1461 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1462 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1463 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1464 ls->authorize_fails++;
1465 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1466 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1467 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1468 ls->negotiate_fails++;
1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1470 } else {
1471 ls->other_fails++;
1472 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1473 }
1474
1475 /* Save initiator name, ip address and time, if it is a failed login */
1476 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1477 if (conn->param_list)
1478 intrname = iscsi_find_param_from_key(INITIATORNAME,
1479 conn->param_list);
1480 strcpy(ls->last_intr_fail_name,
1481 (intrname ? intrname->value : "Unknown"));
1482
1483 ls->last_intr_fail_ip_family = conn->login_family;
1484
1485 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1486 "%s", conn->login_ip);
1487 ls->last_fail_time = get_jiffies_64();
1488 }
1489
1490 spin_unlock(&ls->lock);
1491 }
1492
1493 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1494 {
1495 struct iscsi_portal_group *tpg;
1496
1497 if (!conn || !conn->sess)
1498 return NULL;
1499
1500 tpg = conn->sess->tpg;
1501 if (!tpg)
1502 return NULL;
1503
1504 if (!tpg->tpg_tiqn)
1505 return NULL;
1506
1507 return tpg->tpg_tiqn;
1508 }
Linux with added FPC-III support