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