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Linux 3.11-rc3
[cris-mirror.git] / drivers / target / iscsi / iscsi_target_util.c
blob1df06d5e4e01ee29353801a671b43d62bf934fbf
1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/list.h>
22 #include <scsi/scsi_tcq.h>
23 #include <scsi/iscsi_proto.h>
24 #include <target/target_core_base.h>
25 #include <target/target_core_fabric.h>
26 #include <target/target_core_configfs.h>
27 #include <target/iscsi/iscsi_transport.h>
28
29 #include "iscsi_target_core.h"
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_seq_pdu_list.h"
32 #include "iscsi_target_datain_values.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target_tpg.h"
37 #include "iscsi_target_tq.h"
38 #include "iscsi_target_util.h"
39 #include "iscsi_target.h"
40
41 #define PRINT_BUFF(buff, len) \
42 { \
43 int zzz; \
44 \
45 pr_debug("%d:\n", __LINE__); \
46 for (zzz = 0; zzz < len; zzz++) { \
47 if (zzz % 16 == 0) { \
48 if (zzz) \
49 pr_debug("\n"); \
50 pr_debug("%4i: ", zzz); \
51 } \
52 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
53 } \
54 if ((len + 1) % 16) \
55 pr_debug("\n"); \
56 }
57
58 extern struct list_head g_tiqn_list;
59 extern spinlock_t tiqn_lock;
60
61 /*
62 * Called with cmd->r2t_lock held.
63 */
64 int iscsit_add_r2t_to_list(
65 struct iscsi_cmd *cmd,
66 u32 offset,
67 u32 xfer_len,
68 int recovery,
69 u32 r2t_sn)
70 {
71 struct iscsi_r2t *r2t;
72
73 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
74 if (!r2t) {
75 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
76 return -1;
77 }
78 INIT_LIST_HEAD(&r2t->r2t_list);
79
80 r2t->recovery_r2t = recovery;
81 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
82 r2t->offset = offset;
83 r2t->xfer_len = xfer_len;
84 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
85 spin_unlock_bh(&cmd->r2t_lock);
86
87 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
88
89 spin_lock_bh(&cmd->r2t_lock);
90 return 0;
91 }
92
93 struct iscsi_r2t *iscsit_get_r2t_for_eos(
94 struct iscsi_cmd *cmd,
95 u32 offset,
96 u32 length)
97 {
98 struct iscsi_r2t *r2t;
99
100 spin_lock_bh(&cmd->r2t_lock);
101 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
102 if ((r2t->offset <= offset) &&
103 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
104 spin_unlock_bh(&cmd->r2t_lock);
105 return r2t;
106 }
107 }
108 spin_unlock_bh(&cmd->r2t_lock);
109
110 pr_err("Unable to locate R2T for Offset: %u, Length:"
111 " %u\n", offset, length);
112 return NULL;
113 }
114
115 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
116 {
117 struct iscsi_r2t *r2t;
118
119 spin_lock_bh(&cmd->r2t_lock);
120 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
121 if (!r2t->sent_r2t) {
122 spin_unlock_bh(&cmd->r2t_lock);
123 return r2t;
124 }
125 }
126 spin_unlock_bh(&cmd->r2t_lock);
127
128 pr_err("Unable to locate next R2T to send for ITT:"
129 " 0x%08x.\n", cmd->init_task_tag);
130 return NULL;
131 }
132
133 /*
134 * Called with cmd->r2t_lock held.
135 */
136 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
137 {
138 list_del(&r2t->r2t_list);
139 kmem_cache_free(lio_r2t_cache, r2t);
140 }
141
142 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
143 {
144 struct iscsi_r2t *r2t, *r2t_tmp;
145
146 spin_lock_bh(&cmd->r2t_lock);
147 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
148 iscsit_free_r2t(r2t, cmd);
149 spin_unlock_bh(&cmd->r2t_lock);
150 }
151
152 struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
153 {
154 struct iscsi_cmd *cmd;
155
156 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
157 if (!cmd)
158 return NULL;
159
160 cmd->release_cmd = &iscsit_release_cmd;
161 return cmd;
162 }
163
164 /*
165 * May be called from software interrupt (timer) context for allocating
166 * iSCSI NopINs.
167 */
168 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
169 {
170 struct iscsi_cmd *cmd;
171
172 cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask);
173 if (!cmd) {
174 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
175 return NULL;
176 }
177 cmd->conn = conn;
178 INIT_LIST_HEAD(&cmd->i_conn_node);
179 INIT_LIST_HEAD(&cmd->datain_list);
180 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
181 spin_lock_init(&cmd->datain_lock);
182 spin_lock_init(&cmd->dataout_timeout_lock);
183 spin_lock_init(&cmd->istate_lock);
184 spin_lock_init(&cmd->error_lock);
185 spin_lock_init(&cmd->r2t_lock);
186
187 return cmd;
188 }
189 EXPORT_SYMBOL(iscsit_allocate_cmd);
190
191 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
192 struct iscsi_cmd *cmd,
193 u32 seq_send_order)
194 {
195 u32 i;
196
197 for (i = 0; i < cmd->seq_count; i++)
198 if (cmd->seq_list[i].seq_send_order == seq_send_order)
199 return &cmd->seq_list[i];
200
201 return NULL;
202 }
203
204 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
205 {
206 u32 i;
207
208 if (!cmd->seq_list) {
209 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
210 return NULL;
211 }
212
213 for (i = 0; i < cmd->seq_count; i++) {
214 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
215 continue;
216 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
217 cmd->seq_send_order++;
218 return &cmd->seq_list[i];
219 }
220 }
221
222 return NULL;
223 }
224
225 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
226 struct iscsi_cmd *cmd,
227 u32 r2t_sn)
228 {
229 struct iscsi_r2t *r2t;
230
231 spin_lock_bh(&cmd->r2t_lock);
232 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
233 if (r2t->r2t_sn == r2t_sn) {
234 spin_unlock_bh(&cmd->r2t_lock);
235 return r2t;
236 }
237 }
238 spin_unlock_bh(&cmd->r2t_lock);
239
240 return NULL;
241 }
242
243 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
244 {
245 int ret;
246
247 /*
248 * This is the proper method of checking received CmdSN against
249 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
250 * or order CmdSNs due to multiple connection sessions and/or
251 * CRC failures.
252 */
253 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
254 pr_err("Received CmdSN: 0x%08x is greater than"
255 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
256 sess->max_cmd_sn);
257 ret = CMDSN_ERROR_CANNOT_RECOVER;
258
259 } else if (cmdsn == sess->exp_cmd_sn) {
260 sess->exp_cmd_sn++;
261 pr_debug("Received CmdSN matches ExpCmdSN,"
262 " incremented ExpCmdSN to: 0x%08x\n",
263 sess->exp_cmd_sn);
264 ret = CMDSN_NORMAL_OPERATION;
265
266 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
267 pr_debug("Received CmdSN: 0x%08x is greater"
268 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
269 cmdsn, sess->exp_cmd_sn);
270 ret = CMDSN_HIGHER_THAN_EXP;
271
272 } else {
273 pr_err("Received CmdSN: 0x%08x is less than"
274 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
275 sess->exp_cmd_sn);
276 ret = CMDSN_LOWER_THAN_EXP;
277 }
278
279 return ret;
280 }
281
282 /*
283 * Commands may be received out of order if MC/S is in use.
284 * Ensure they are executed in CmdSN order.
285 */
286 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
287 unsigned char *buf, __be32 cmdsn)
288 {
289 int ret, cmdsn_ret;
290 bool reject = false;
291 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
292
293 mutex_lock(&conn->sess->cmdsn_mutex);
294
295 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
296 switch (cmdsn_ret) {
297 case CMDSN_NORMAL_OPERATION:
298 ret = iscsit_execute_cmd(cmd, 0);
299 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
300 iscsit_execute_ooo_cmdsns(conn->sess);
301 else if (ret < 0) {
302 reject = true;
303 ret = CMDSN_ERROR_CANNOT_RECOVER;
304 }
305 break;
306 case CMDSN_HIGHER_THAN_EXP:
307 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
308 if (ret < 0) {
309 reject = true;
310 ret = CMDSN_ERROR_CANNOT_RECOVER;
311 break;
312 }
313 ret = CMDSN_HIGHER_THAN_EXP;
314 break;
315 case CMDSN_LOWER_THAN_EXP:
316 cmd->i_state = ISTATE_REMOVE;
317 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
318 ret = cmdsn_ret;
319 break;
320 default:
321 reason = ISCSI_REASON_PROTOCOL_ERROR;
322 reject = true;
323 ret = cmdsn_ret;
324 break;
325 }
326 mutex_unlock(&conn->sess->cmdsn_mutex);
327
328 if (reject)
329 iscsit_reject_cmd(cmd, reason, buf);
330
331 return ret;
332 }
333 EXPORT_SYMBOL(iscsit_sequence_cmd);
334
335 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
336 {
337 struct iscsi_conn *conn = cmd->conn;
338 struct se_cmd *se_cmd = &cmd->se_cmd;
339 struct iscsi_data *hdr = (struct iscsi_data *) buf;
340 u32 payload_length = ntoh24(hdr->dlength);
341
342 if (conn->sess->sess_ops->InitialR2T) {
343 pr_err("Received unexpected unsolicited data"
344 " while InitialR2T=Yes, protocol error.\n");
345 transport_send_check_condition_and_sense(se_cmd,
346 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
347 return -1;
348 }
349
350 if ((cmd->first_burst_len + payload_length) >
351 conn->sess->sess_ops->FirstBurstLength) {
352 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
353 " for this Unsolicited DataOut Burst.\n",
354 (cmd->first_burst_len + payload_length),
355 conn->sess->sess_ops->FirstBurstLength);
356 transport_send_check_condition_and_sense(se_cmd,
357 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
358 return -1;
359 }
360
361 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
362 return 0;
363
364 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
365 ((cmd->first_burst_len + payload_length) !=
366 conn->sess->sess_ops->FirstBurstLength)) {
367 pr_err("Unsolicited non-immediate data received %u"
368 " does not equal FirstBurstLength: %u, and does"
369 " not equal ExpXferLen %u.\n",
370 (cmd->first_burst_len + payload_length),
371 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
372 transport_send_check_condition_and_sense(se_cmd,
373 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
374 return -1;
375 }
376 return 0;
377 }
378
379 struct iscsi_cmd *iscsit_find_cmd_from_itt(
380 struct iscsi_conn *conn,
381 itt_t init_task_tag)
382 {
383 struct iscsi_cmd *cmd;
384
385 spin_lock_bh(&conn->cmd_lock);
386 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
387 if (cmd->init_task_tag == init_task_tag) {
388 spin_unlock_bh(&conn->cmd_lock);
389 return cmd;
390 }
391 }
392 spin_unlock_bh(&conn->cmd_lock);
393
394 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
395 init_task_tag, conn->cid);
396 return NULL;
397 }
398
399 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
400 struct iscsi_conn *conn,
401 itt_t init_task_tag,
402 u32 length)
403 {
404 struct iscsi_cmd *cmd;
405
406 spin_lock_bh(&conn->cmd_lock);
407 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
408 if (cmd->init_task_tag == init_task_tag) {
409 spin_unlock_bh(&conn->cmd_lock);
410 return cmd;
411 }
412 }
413 spin_unlock_bh(&conn->cmd_lock);
414
415 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
416 " dumping payload\n", init_task_tag, conn->cid);
417 if (length)
418 iscsit_dump_data_payload(conn, length, 1);
419
420 return NULL;
421 }
422
423 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
424 struct iscsi_conn *conn,
425 u32 targ_xfer_tag)
426 {
427 struct iscsi_cmd *cmd = NULL;
428
429 spin_lock_bh(&conn->cmd_lock);
430 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
431 if (cmd->targ_xfer_tag == targ_xfer_tag) {
432 spin_unlock_bh(&conn->cmd_lock);
433 return cmd;
434 }
435 }
436 spin_unlock_bh(&conn->cmd_lock);
437
438 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
439 targ_xfer_tag, conn->cid);
440 return NULL;
441 }
442
443 int iscsit_find_cmd_for_recovery(
444 struct iscsi_session *sess,
445 struct iscsi_cmd **cmd_ptr,
446 struct iscsi_conn_recovery **cr_ptr,
447 itt_t init_task_tag)
448 {
449 struct iscsi_cmd *cmd = NULL;
450 struct iscsi_conn_recovery *cr;
451 /*
452 * Scan through the inactive connection recovery list's command list.
453 * If init_task_tag matches the command is still alligent.
454 */
455 spin_lock(&sess->cr_i_lock);
456 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
457 spin_lock(&cr->conn_recovery_cmd_lock);
458 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
459 if (cmd->init_task_tag == init_task_tag) {
460 spin_unlock(&cr->conn_recovery_cmd_lock);
461 spin_unlock(&sess->cr_i_lock);
462
463 *cr_ptr = cr;
464 *cmd_ptr = cmd;
465 return -2;
466 }
467 }
468 spin_unlock(&cr->conn_recovery_cmd_lock);
469 }
470 spin_unlock(&sess->cr_i_lock);
471 /*
472 * Scan through the active connection recovery list's command list.
473 * If init_task_tag matches the command is ready to be reassigned.
474 */
475 spin_lock(&sess->cr_a_lock);
476 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
477 spin_lock(&cr->conn_recovery_cmd_lock);
478 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
479 if (cmd->init_task_tag == init_task_tag) {
480 spin_unlock(&cr->conn_recovery_cmd_lock);
481 spin_unlock(&sess->cr_a_lock);
482
483 *cr_ptr = cr;
484 *cmd_ptr = cmd;
485 return 0;
486 }
487 }
488 spin_unlock(&cr->conn_recovery_cmd_lock);
489 }
490 spin_unlock(&sess->cr_a_lock);
491
492 return -1;
493 }
494
495 void iscsit_add_cmd_to_immediate_queue(
496 struct iscsi_cmd *cmd,
497 struct iscsi_conn *conn,
498 u8 state)
499 {
500 struct iscsi_queue_req *qr;
501
502 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
503 if (!qr) {
504 pr_err("Unable to allocate memory for"
505 " struct iscsi_queue_req\n");
506 return;
507 }
508 INIT_LIST_HEAD(&qr->qr_list);
509 qr->cmd = cmd;
510 qr->state = state;
511
512 spin_lock_bh(&conn->immed_queue_lock);
513 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
514 atomic_inc(&cmd->immed_queue_count);
515 atomic_set(&conn->check_immediate_queue, 1);
516 spin_unlock_bh(&conn->immed_queue_lock);
517
518 wake_up(&conn->queues_wq);
519 }
520
521 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
522 {
523 struct iscsi_queue_req *qr;
524
525 spin_lock_bh(&conn->immed_queue_lock);
526 if (list_empty(&conn->immed_queue_list)) {
527 spin_unlock_bh(&conn->immed_queue_lock);
528 return NULL;
529 }
530 qr = list_first_entry(&conn->immed_queue_list,
531 struct iscsi_queue_req, qr_list);
532
533 list_del(&qr->qr_list);
534 if (qr->cmd)
535 atomic_dec(&qr->cmd->immed_queue_count);
536 spin_unlock_bh(&conn->immed_queue_lock);
537
538 return qr;
539 }
540
541 static void iscsit_remove_cmd_from_immediate_queue(
542 struct iscsi_cmd *cmd,
543 struct iscsi_conn *conn)
544 {
545 struct iscsi_queue_req *qr, *qr_tmp;
546
547 spin_lock_bh(&conn->immed_queue_lock);
548 if (!atomic_read(&cmd->immed_queue_count)) {
549 spin_unlock_bh(&conn->immed_queue_lock);
550 return;
551 }
552
553 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
554 if (qr->cmd != cmd)
555 continue;
556
557 atomic_dec(&qr->cmd->immed_queue_count);
558 list_del(&qr->qr_list);
559 kmem_cache_free(lio_qr_cache, qr);
560 }
561 spin_unlock_bh(&conn->immed_queue_lock);
562
563 if (atomic_read(&cmd->immed_queue_count)) {
564 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
565 cmd->init_task_tag,
566 atomic_read(&cmd->immed_queue_count));
567 }
568 }
569
570 void iscsit_add_cmd_to_response_queue(
571 struct iscsi_cmd *cmd,
572 struct iscsi_conn *conn,
573 u8 state)
574 {
575 struct iscsi_queue_req *qr;
576
577 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
578 if (!qr) {
579 pr_err("Unable to allocate memory for"
580 " struct iscsi_queue_req\n");
581 return;
582 }
583 INIT_LIST_HEAD(&qr->qr_list);
584 qr->cmd = cmd;
585 qr->state = state;
586
587 spin_lock_bh(&conn->response_queue_lock);
588 list_add_tail(&qr->qr_list, &conn->response_queue_list);
589 atomic_inc(&cmd->response_queue_count);
590 spin_unlock_bh(&conn->response_queue_lock);
591
592 wake_up(&conn->queues_wq);
593 }
594
595 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
596 {
597 struct iscsi_queue_req *qr;
598
599 spin_lock_bh(&conn->response_queue_lock);
600 if (list_empty(&conn->response_queue_list)) {
601 spin_unlock_bh(&conn->response_queue_lock);
602 return NULL;
603 }
604
605 qr = list_first_entry(&conn->response_queue_list,
606 struct iscsi_queue_req, qr_list);
607
608 list_del(&qr->qr_list);
609 if (qr->cmd)
610 atomic_dec(&qr->cmd->response_queue_count);
611 spin_unlock_bh(&conn->response_queue_lock);
612
613 return qr;
614 }
615
616 static void iscsit_remove_cmd_from_response_queue(
617 struct iscsi_cmd *cmd,
618 struct iscsi_conn *conn)
619 {
620 struct iscsi_queue_req *qr, *qr_tmp;
621
622 spin_lock_bh(&conn->response_queue_lock);
623 if (!atomic_read(&cmd->response_queue_count)) {
624 spin_unlock_bh(&conn->response_queue_lock);
625 return;
626 }
627
628 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
629 qr_list) {
630 if (qr->cmd != cmd)
631 continue;
632
633 atomic_dec(&qr->cmd->response_queue_count);
634 list_del(&qr->qr_list);
635 kmem_cache_free(lio_qr_cache, qr);
636 }
637 spin_unlock_bh(&conn->response_queue_lock);
638
639 if (atomic_read(&cmd->response_queue_count)) {
640 pr_err("ITT: 0x%08x response_queue_count: %d\n",
641 cmd->init_task_tag,
642 atomic_read(&cmd->response_queue_count));
643 }
644 }
645
646 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
647 {
648 bool empty;
649
650 spin_lock_bh(&conn->immed_queue_lock);
651 empty = list_empty(&conn->immed_queue_list);
652 spin_unlock_bh(&conn->immed_queue_lock);
653
654 if (!empty)
655 return empty;
656
657 spin_lock_bh(&conn->response_queue_lock);
658 empty = list_empty(&conn->response_queue_list);
659 spin_unlock_bh(&conn->response_queue_lock);
660
661 return empty;
662 }
663
664 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
665 {
666 struct iscsi_queue_req *qr, *qr_tmp;
667
668 spin_lock_bh(&conn->immed_queue_lock);
669 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
670 list_del(&qr->qr_list);
671 if (qr->cmd)
672 atomic_dec(&qr->cmd->immed_queue_count);
673
674 kmem_cache_free(lio_qr_cache, qr);
675 }
676 spin_unlock_bh(&conn->immed_queue_lock);
677
678 spin_lock_bh(&conn->response_queue_lock);
679 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
680 qr_list) {
681 list_del(&qr->qr_list);
682 if (qr->cmd)
683 atomic_dec(&qr->cmd->response_queue_count);
684
685 kmem_cache_free(lio_qr_cache, qr);
686 }
687 spin_unlock_bh(&conn->response_queue_lock);
688 }
689
690 void iscsit_release_cmd(struct iscsi_cmd *cmd)
691 {
692 kfree(cmd->buf_ptr);
693 kfree(cmd->pdu_list);
694 kfree(cmd->seq_list);
695 kfree(cmd->tmr_req);
696 kfree(cmd->iov_data);
697 kfree(cmd->text_in_ptr);
698
699 kmem_cache_free(lio_cmd_cache, cmd);
700 }
701
702 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
703 bool check_queues)
704 {
705 struct iscsi_conn *conn = cmd->conn;
706
707 if (scsi_cmd) {
708 if (cmd->data_direction == DMA_TO_DEVICE) {
709 iscsit_stop_dataout_timer(cmd);
710 iscsit_free_r2ts_from_list(cmd);
711 }
712 if (cmd->data_direction == DMA_FROM_DEVICE)
713 iscsit_free_all_datain_reqs(cmd);
714 }
715
716 if (conn && check_queues) {
717 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
718 iscsit_remove_cmd_from_response_queue(cmd, conn);
719 }
720 }
721
722 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
723 {
724 struct se_cmd *se_cmd = NULL;
725 int rc;
726 /*
727 * Determine if a struct se_cmd is associated with
728 * this struct iscsi_cmd.
729 */
730 switch (cmd->iscsi_opcode) {
731 case ISCSI_OP_SCSI_CMD:
732 se_cmd = &cmd->se_cmd;
733 __iscsit_free_cmd(cmd, true, shutdown);
734 /*
735 * Fallthrough
736 */
737 case ISCSI_OP_SCSI_TMFUNC:
738 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
739 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
740 __iscsit_free_cmd(cmd, true, shutdown);
741 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
742 }
743 break;
744 case ISCSI_OP_REJECT:
745 /*
746 * Handle special case for REJECT when iscsi_add_reject*() has
747 * overwritten the original iscsi_opcode assignment, and the
748 * associated cmd->se_cmd needs to be released.
749 */
750 if (cmd->se_cmd.se_tfo != NULL) {
751 se_cmd = &cmd->se_cmd;
752 __iscsit_free_cmd(cmd, true, shutdown);
753
754 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
755 if (!rc && shutdown && se_cmd->se_sess) {
756 __iscsit_free_cmd(cmd, true, shutdown);
757 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
758 }
759 break;
760 }
761 /* Fall-through */
762 default:
763 __iscsit_free_cmd(cmd, false, shutdown);
764 cmd->release_cmd(cmd);
765 break;
766 }
767 }
768
769 int iscsit_check_session_usage_count(struct iscsi_session *sess)
770 {
771 spin_lock_bh(&sess->session_usage_lock);
772 if (sess->session_usage_count != 0) {
773 sess->session_waiting_on_uc = 1;
774 spin_unlock_bh(&sess->session_usage_lock);
775 if (in_interrupt())
776 return 2;
777
778 wait_for_completion(&sess->session_waiting_on_uc_comp);
779 return 1;
780 }
781 spin_unlock_bh(&sess->session_usage_lock);
782
783 return 0;
784 }
785
786 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
787 {
788 spin_lock_bh(&sess->session_usage_lock);
789 sess->session_usage_count--;
790
791 if (!sess->session_usage_count && sess->session_waiting_on_uc)
792 complete(&sess->session_waiting_on_uc_comp);
793
794 spin_unlock_bh(&sess->session_usage_lock);
795 }
796
797 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
798 {
799 spin_lock_bh(&sess->session_usage_lock);
800 sess->session_usage_count++;
801 spin_unlock_bh(&sess->session_usage_lock);
802 }
803
804 /*
805 * Setup conn->if_marker and conn->of_marker values based upon
806 * the initial marker-less interval. (see iSCSI v19 A.2)
807 */
808 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
809 {
810 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
811 /*
812 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
813 */
814 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
815 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
816
817 if (conn->conn_ops->OFMarker) {
818 /*
819 * Account for the first Login Command received not
820 * via iscsi_recv_msg().
821 */
822 conn->of_marker += ISCSI_HDR_LEN;
823 if (conn->of_marker <= OFMarkInt) {
824 conn->of_marker = (OFMarkInt - conn->of_marker);
825 } else {
826 login_ofmarker_count = (conn->of_marker / OFMarkInt);
827 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
828 (login_ofmarker_count * MARKER_SIZE);
829 conn->of_marker = (next_marker - conn->of_marker);
830 }
831 conn->of_marker_offset = 0;
832 pr_debug("Setting OFMarker value to %u based on Initial"
833 " Markerless Interval.\n", conn->of_marker);
834 }
835
836 if (conn->conn_ops->IFMarker) {
837 if (conn->if_marker <= IFMarkInt) {
838 conn->if_marker = (IFMarkInt - conn->if_marker);
839 } else {
840 login_ifmarker_count = (conn->if_marker / IFMarkInt);
841 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
842 (login_ifmarker_count * MARKER_SIZE);
843 conn->if_marker = (next_marker - conn->if_marker);
844 }
845 pr_debug("Setting IFMarker value to %u based on Initial"
846 " Markerless Interval.\n", conn->if_marker);
847 }
848
849 return 0;
850 }
851
852 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
853 {
854 struct iscsi_conn *conn;
855
856 spin_lock_bh(&sess->conn_lock);
857 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
858 if ((conn->cid == cid) &&
859 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
860 iscsit_inc_conn_usage_count(conn);
861 spin_unlock_bh(&sess->conn_lock);
862 return conn;
863 }
864 }
865 spin_unlock_bh(&sess->conn_lock);
866
867 return NULL;
868 }
869
870 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
871 {
872 struct iscsi_conn *conn;
873
874 spin_lock_bh(&sess->conn_lock);
875 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
876 if (conn->cid == cid) {
877 iscsit_inc_conn_usage_count(conn);
878 spin_lock(&conn->state_lock);
879 atomic_set(&conn->connection_wait_rcfr, 1);
880 spin_unlock(&conn->state_lock);
881 spin_unlock_bh(&sess->conn_lock);
882 return conn;
883 }
884 }
885 spin_unlock_bh(&sess->conn_lock);
886
887 return NULL;
888 }
889
890 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
891 {
892 spin_lock_bh(&conn->conn_usage_lock);
893 if (conn->conn_usage_count != 0) {
894 conn->conn_waiting_on_uc = 1;
895 spin_unlock_bh(&conn->conn_usage_lock);
896
897 wait_for_completion(&conn->conn_waiting_on_uc_comp);
898 return;
899 }
900 spin_unlock_bh(&conn->conn_usage_lock);
901 }
902
903 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
904 {
905 spin_lock_bh(&conn->conn_usage_lock);
906 conn->conn_usage_count--;
907
908 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
909 complete(&conn->conn_waiting_on_uc_comp);
910
911 spin_unlock_bh(&conn->conn_usage_lock);
912 }
913
914 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
915 {
916 spin_lock_bh(&conn->conn_usage_lock);
917 conn->conn_usage_count++;
918 spin_unlock_bh(&conn->conn_usage_lock);
919 }
920
921 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
922 {
923 u8 state;
924 struct iscsi_cmd *cmd;
925
926 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
927 if (!cmd)
928 return -1;
929
930 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
931 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
932 ISTATE_SEND_NOPIN_NO_RESPONSE;
933 cmd->init_task_tag = RESERVED_ITT;
934 spin_lock_bh(&conn->sess->ttt_lock);
935 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
936 0xFFFFFFFF;
937 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
938 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
939 spin_unlock_bh(&conn->sess->ttt_lock);
940
941 spin_lock_bh(&conn->cmd_lock);
942 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
943 spin_unlock_bh(&conn->cmd_lock);
944
945 if (want_response)
946 iscsit_start_nopin_response_timer(conn);
947 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
948
949 return 0;
950 }
951
952 static void iscsit_handle_nopin_response_timeout(unsigned long data)
953 {
954 struct iscsi_conn *conn = (struct iscsi_conn *) data;
955
956 iscsit_inc_conn_usage_count(conn);
957
958 spin_lock_bh(&conn->nopin_timer_lock);
959 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
960 spin_unlock_bh(&conn->nopin_timer_lock);
961 iscsit_dec_conn_usage_count(conn);
962 return;
963 }
964
965 pr_debug("Did not receive response to NOPIN on CID: %hu on"
966 " SID: %u, failing connection.\n", conn->cid,
967 conn->sess->sid);
968 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
969 spin_unlock_bh(&conn->nopin_timer_lock);
970
971 {
972 struct iscsi_portal_group *tpg = conn->sess->tpg;
973 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
974
975 if (tiqn) {
976 spin_lock_bh(&tiqn->sess_err_stats.lock);
977 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
978 conn->sess->sess_ops->InitiatorName);
979 tiqn->sess_err_stats.last_sess_failure_type =
980 ISCSI_SESS_ERR_CXN_TIMEOUT;
981 tiqn->sess_err_stats.cxn_timeout_errors++;
982 conn->sess->conn_timeout_errors++;
983 spin_unlock_bh(&tiqn->sess_err_stats.lock);
984 }
985 }
986
987 iscsit_cause_connection_reinstatement(conn, 0);
988 iscsit_dec_conn_usage_count(conn);
989 }
990
991 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
992 {
993 struct iscsi_session *sess = conn->sess;
994 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
995
996 spin_lock_bh(&conn->nopin_timer_lock);
997 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
998 spin_unlock_bh(&conn->nopin_timer_lock);
999 return;
1000 }
1001
1002 mod_timer(&conn->nopin_response_timer,
1003 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1004 spin_unlock_bh(&conn->nopin_timer_lock);
1005 }
1006
1007 /*
1008 * Called with conn->nopin_timer_lock held.
1009 */
1010 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1011 {
1012 struct iscsi_session *sess = conn->sess;
1013 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1014
1015 spin_lock_bh(&conn->nopin_timer_lock);
1016 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1017 spin_unlock_bh(&conn->nopin_timer_lock);
1018 return;
1019 }
1020
1021 init_timer(&conn->nopin_response_timer);
1022 conn->nopin_response_timer.expires =
1023 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1024 conn->nopin_response_timer.data = (unsigned long)conn;
1025 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1026 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1027 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1028 add_timer(&conn->nopin_response_timer);
1029
1030 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1031 " seconds\n", conn->cid, na->nopin_response_timeout);
1032 spin_unlock_bh(&conn->nopin_timer_lock);
1033 }
1034
1035 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1036 {
1037 spin_lock_bh(&conn->nopin_timer_lock);
1038 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1039 spin_unlock_bh(&conn->nopin_timer_lock);
1040 return;
1041 }
1042 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1043 spin_unlock_bh(&conn->nopin_timer_lock);
1044
1045 del_timer_sync(&conn->nopin_response_timer);
1046
1047 spin_lock_bh(&conn->nopin_timer_lock);
1048 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1049 spin_unlock_bh(&conn->nopin_timer_lock);
1050 }
1051
1052 static void iscsit_handle_nopin_timeout(unsigned long data)
1053 {
1054 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1055
1056 iscsit_inc_conn_usage_count(conn);
1057
1058 spin_lock_bh(&conn->nopin_timer_lock);
1059 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1060 spin_unlock_bh(&conn->nopin_timer_lock);
1061 iscsit_dec_conn_usage_count(conn);
1062 return;
1063 }
1064 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1065 spin_unlock_bh(&conn->nopin_timer_lock);
1066
1067 iscsit_add_nopin(conn, 1);
1068 iscsit_dec_conn_usage_count(conn);
1069 }
1070
1071 /*
1072 * Called with conn->nopin_timer_lock held.
1073 */
1074 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1075 {
1076 struct iscsi_session *sess = conn->sess;
1077 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1078 /*
1079 * NOPIN timeout is disabled.
1080 */
1081 if (!na->nopin_timeout)
1082 return;
1083
1084 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1085 return;
1086
1087 init_timer(&conn->nopin_timer);
1088 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1089 conn->nopin_timer.data = (unsigned long)conn;
1090 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1091 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1092 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1093 add_timer(&conn->nopin_timer);
1094
1095 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1096 " interval\n", conn->cid, na->nopin_timeout);
1097 }
1098
1099 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1100 {
1101 struct iscsi_session *sess = conn->sess;
1102 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1103 /*
1104 * NOPIN timeout is disabled..
1105 */
1106 if (!na->nopin_timeout)
1107 return;
1108
1109 spin_lock_bh(&conn->nopin_timer_lock);
1110 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1111 spin_unlock_bh(&conn->nopin_timer_lock);
1112 return;
1113 }
1114
1115 init_timer(&conn->nopin_timer);
1116 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1117 conn->nopin_timer.data = (unsigned long)conn;
1118 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1119 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1120 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1121 add_timer(&conn->nopin_timer);
1122
1123 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1124 " interval\n", conn->cid, na->nopin_timeout);
1125 spin_unlock_bh(&conn->nopin_timer_lock);
1126 }
1127
1128 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1129 {
1130 spin_lock_bh(&conn->nopin_timer_lock);
1131 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1132 spin_unlock_bh(&conn->nopin_timer_lock);
1133 return;
1134 }
1135 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1136 spin_unlock_bh(&conn->nopin_timer_lock);
1137
1138 del_timer_sync(&conn->nopin_timer);
1139
1140 spin_lock_bh(&conn->nopin_timer_lock);
1141 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1142 spin_unlock_bh(&conn->nopin_timer_lock);
1143 }
1144
1145 int iscsit_send_tx_data(
1146 struct iscsi_cmd *cmd,
1147 struct iscsi_conn *conn,
1148 int use_misc)
1149 {
1150 int tx_sent, tx_size;
1151 u32 iov_count;
1152 struct kvec *iov;
1153
1154 send_data:
1155 tx_size = cmd->tx_size;
1156
1157 if (!use_misc) {
1158 iov = &cmd->iov_data[0];
1159 iov_count = cmd->iov_data_count;
1160 } else {
1161 iov = &cmd->iov_misc[0];
1162 iov_count = cmd->iov_misc_count;
1163 }
1164
1165 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1166 if (tx_size != tx_sent) {
1167 if (tx_sent == -EAGAIN) {
1168 pr_err("tx_data() returned -EAGAIN\n");
1169 goto send_data;
1170 } else
1171 return -1;
1172 }
1173 cmd->tx_size = 0;
1174
1175 return 0;
1176 }
1177
1178 int iscsit_fe_sendpage_sg(
1179 struct iscsi_cmd *cmd,
1180 struct iscsi_conn *conn)
1181 {
1182 struct scatterlist *sg = cmd->first_data_sg;
1183 struct kvec iov;
1184 u32 tx_hdr_size, data_len;
1185 u32 offset = cmd->first_data_sg_off;
1186 int tx_sent, iov_off;
1187
1188 send_hdr:
1189 tx_hdr_size = ISCSI_HDR_LEN;
1190 if (conn->conn_ops->HeaderDigest)
1191 tx_hdr_size += ISCSI_CRC_LEN;
1192
1193 iov.iov_base = cmd->pdu;
1194 iov.iov_len = tx_hdr_size;
1195
1196 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1197 if (tx_hdr_size != tx_sent) {
1198 if (tx_sent == -EAGAIN) {
1199 pr_err("tx_data() returned -EAGAIN\n");
1200 goto send_hdr;
1201 }
1202 return -1;
1203 }
1204
1205 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1206 /*
1207 * Set iov_off used by padding and data digest tx_data() calls below
1208 * in order to determine proper offset into cmd->iov_data[]
1209 */
1210 if (conn->conn_ops->DataDigest) {
1211 data_len -= ISCSI_CRC_LEN;
1212 if (cmd->padding)
1213 iov_off = (cmd->iov_data_count - 2);
1214 else
1215 iov_off = (cmd->iov_data_count - 1);
1216 } else {
1217 iov_off = (cmd->iov_data_count - 1);
1218 }
1219 /*
1220 * Perform sendpage() for each page in the scatterlist
1221 */
1222 while (data_len) {
1223 u32 space = (sg->length - offset);
1224 u32 sub_len = min_t(u32, data_len, space);
1225 send_pg:
1226 tx_sent = conn->sock->ops->sendpage(conn->sock,
1227 sg_page(sg), sg->offset + offset, sub_len, 0);
1228 if (tx_sent != sub_len) {
1229 if (tx_sent == -EAGAIN) {
1230 pr_err("tcp_sendpage() returned"
1231 " -EAGAIN\n");
1232 goto send_pg;
1233 }
1234
1235 pr_err("tcp_sendpage() failure: %d\n",
1236 tx_sent);
1237 return -1;
1238 }
1239
1240 data_len -= sub_len;
1241 offset = 0;
1242 sg = sg_next(sg);
1243 }
1244
1245 send_padding:
1246 if (cmd->padding) {
1247 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1248
1249 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1250 if (cmd->padding != tx_sent) {
1251 if (tx_sent == -EAGAIN) {
1252 pr_err("tx_data() returned -EAGAIN\n");
1253 goto send_padding;
1254 }
1255 return -1;
1256 }
1257 }
1258
1259 send_datacrc:
1260 if (conn->conn_ops->DataDigest) {
1261 struct kvec *iov_d = &cmd->iov_data[iov_off];
1262
1263 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1264 if (ISCSI_CRC_LEN != tx_sent) {
1265 if (tx_sent == -EAGAIN) {
1266 pr_err("tx_data() returned -EAGAIN\n");
1267 goto send_datacrc;
1268 }
1269 return -1;
1270 }
1271 }
1272
1273 return 0;
1274 }
1275
1276 /*
1277 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1278 * back to the Initiator when an expection condition occurs with the
1279 * errors set in status_class and status_detail.
1280 *
1281 * Parameters: iSCSI Connection, Status Class, Status Detail.
1282 * Returns: 0 on success, -1 on error.
1283 */
1284 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1285 {
1286 struct iscsi_login_rsp *hdr;
1287 struct iscsi_login *login = conn->conn_login;
1288
1289 login->login_failed = 1;
1290 iscsit_collect_login_stats(conn, status_class, status_detail);
1291
1292 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1293 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1294 hdr->status_class = status_class;
1295 hdr->status_detail = status_detail;
1296 hdr->itt = conn->login_itt;
1297
1298 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1299 }
1300
1301 void iscsit_print_session_params(struct iscsi_session *sess)
1302 {
1303 struct iscsi_conn *conn;
1304
1305 pr_debug("-----------------------------[Session Params for"
1306 " SID: %u]-----------------------------\n", sess->sid);
1307 spin_lock_bh(&sess->conn_lock);
1308 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1309 iscsi_dump_conn_ops(conn->conn_ops);
1310 spin_unlock_bh(&sess->conn_lock);
1311
1312 iscsi_dump_sess_ops(sess->sess_ops);
1313 }
1314
1315 static int iscsit_do_rx_data(
1316 struct iscsi_conn *conn,
1317 struct iscsi_data_count *count)
1318 {
1319 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1320 struct kvec *iov_p;
1321 struct msghdr msg;
1322
1323 if (!conn || !conn->sock || !conn->conn_ops)
1324 return -1;
1325
1326 memset(&msg, 0, sizeof(struct msghdr));
1327
1328 iov_p = count->iov;
1329 iov_len = count->iov_count;
1330
1331 while (total_rx < data) {
1332 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1333 (data - total_rx), MSG_WAITALL);
1334 if (rx_loop <= 0) {
1335 pr_debug("rx_loop: %d total_rx: %d\n",
1336 rx_loop, total_rx);
1337 return rx_loop;
1338 }
1339 total_rx += rx_loop;
1340 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1341 rx_loop, total_rx, data);
1342 }
1343
1344 return total_rx;
1345 }
1346
1347 static int iscsit_do_tx_data(
1348 struct iscsi_conn *conn,
1349 struct iscsi_data_count *count)
1350 {
1351 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1352 struct kvec *iov_p;
1353 struct msghdr msg;
1354
1355 if (!conn || !conn->sock || !conn->conn_ops)
1356 return -1;
1357
1358 if (data <= 0) {
1359 pr_err("Data length is: %d\n", data);
1360 return -1;
1361 }
1362
1363 memset(&msg, 0, sizeof(struct msghdr));
1364
1365 iov_p = count->iov;
1366 iov_len = count->iov_count;
1367
1368 while (total_tx < data) {
1369 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1370 (data - total_tx));
1371 if (tx_loop <= 0) {
1372 pr_debug("tx_loop: %d total_tx %d\n",
1373 tx_loop, total_tx);
1374 return tx_loop;
1375 }
1376 total_tx += tx_loop;
1377 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1378 tx_loop, total_tx, data);
1379 }
1380
1381 return total_tx;
1382 }
1383
1384 int rx_data(
1385 struct iscsi_conn *conn,
1386 struct kvec *iov,
1387 int iov_count,
1388 int data)
1389 {
1390 struct iscsi_data_count c;
1391
1392 if (!conn || !conn->sock || !conn->conn_ops)
1393 return -1;
1394
1395 memset(&c, 0, sizeof(struct iscsi_data_count));
1396 c.iov = iov;
1397 c.iov_count = iov_count;
1398 c.data_length = data;
1399 c.type = ISCSI_RX_DATA;
1400
1401 return iscsit_do_rx_data(conn, &c);
1402 }
1403
1404 int tx_data(
1405 struct iscsi_conn *conn,
1406 struct kvec *iov,
1407 int iov_count,
1408 int data)
1409 {
1410 struct iscsi_data_count c;
1411
1412 if (!conn || !conn->sock || !conn->conn_ops)
1413 return -1;
1414
1415 memset(&c, 0, sizeof(struct iscsi_data_count));
1416 c.iov = iov;
1417 c.iov_count = iov_count;
1418 c.data_length = data;
1419 c.type = ISCSI_TX_DATA;
1420
1421 return iscsit_do_tx_data(conn, &c);
1422 }
1423
1424 void iscsit_collect_login_stats(
1425 struct iscsi_conn *conn,
1426 u8 status_class,
1427 u8 status_detail)
1428 {
1429 struct iscsi_param *intrname = NULL;
1430 struct iscsi_tiqn *tiqn;
1431 struct iscsi_login_stats *ls;
1432
1433 tiqn = iscsit_snmp_get_tiqn(conn);
1434 if (!tiqn)
1435 return;
1436
1437 ls = &tiqn->login_stats;
1438
1439 spin_lock(&ls->lock);
1440 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1441 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1442 /* We already have the failure info for this login */
1443 spin_unlock(&ls->lock);
1444 return;
1445 }
1446
1447 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1448 ls->accepts++;
1449 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1450 ls->redirects++;
1451 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1452 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1453 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1454 ls->authenticate_fails++;
1455 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1456 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1457 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1458 ls->authorize_fails++;
1459 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1460 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1461 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1462 ls->negotiate_fails++;
1463 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1464 } else {
1465 ls->other_fails++;
1466 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1467 }
1468
1469 /* Save initiator name, ip address and time, if it is a failed login */
1470 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1471 if (conn->param_list)
1472 intrname = iscsi_find_param_from_key(INITIATORNAME,
1473 conn->param_list);
1474 strcpy(ls->last_intr_fail_name,
1475 (intrname ? intrname->value : "Unknown"));
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 }
CRIS linux kernel tree