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iscsit: use the itt_t abstract type
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target_util.c
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
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, gfp_t gfp_mask)
156 {
157 struct iscsi_cmd *cmd;
158
159 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
160 if (!cmd) {
161 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
162 return NULL;
163 }
164
165 cmd->conn = conn;
166 INIT_LIST_HEAD(&cmd->i_conn_node);
167 INIT_LIST_HEAD(&cmd->datain_list);
168 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
169 init_completion(&cmd->reject_comp);
170 spin_lock_init(&cmd->datain_lock);
171 spin_lock_init(&cmd->dataout_timeout_lock);
172 spin_lock_init(&cmd->istate_lock);
173 spin_lock_init(&cmd->error_lock);
174 spin_lock_init(&cmd->r2t_lock);
175
176 return cmd;
177 }
178
179 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
180 struct iscsi_cmd *cmd,
181 u32 seq_send_order)
182 {
183 u32 i;
184
185 for (i = 0; i < cmd->seq_count; i++)
186 if (cmd->seq_list[i].seq_send_order == seq_send_order)
187 return &cmd->seq_list[i];
188
189 return NULL;
190 }
191
192 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
193 {
194 u32 i;
195
196 if (!cmd->seq_list) {
197 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
198 return NULL;
199 }
200
201 for (i = 0; i < cmd->seq_count; i++) {
202 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
203 continue;
204 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
205 cmd->seq_send_order++;
206 return &cmd->seq_list[i];
207 }
208 }
209
210 return NULL;
211 }
212
213 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
214 struct iscsi_cmd *cmd,
215 u32 r2t_sn)
216 {
217 struct iscsi_r2t *r2t;
218
219 spin_lock_bh(&cmd->r2t_lock);
220 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
221 if (r2t->r2t_sn == r2t_sn) {
222 spin_unlock_bh(&cmd->r2t_lock);
223 return r2t;
224 }
225 }
226 spin_unlock_bh(&cmd->r2t_lock);
227
228 return NULL;
229 }
230
231 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
232 {
233 int ret;
234
235 /*
236 * This is the proper method of checking received CmdSN against
237 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
238 * or order CmdSNs due to multiple connection sessions and/or
239 * CRC failures.
240 */
241 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
242 pr_err("Received CmdSN: 0x%08x is greater than"
243 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
244 sess->max_cmd_sn);
245 ret = CMDSN_ERROR_CANNOT_RECOVER;
246
247 } else if (cmdsn == sess->exp_cmd_sn) {
248 sess->exp_cmd_sn++;
249 pr_debug("Received CmdSN matches ExpCmdSN,"
250 " incremented ExpCmdSN to: 0x%08x\n",
251 sess->exp_cmd_sn);
252 ret = CMDSN_NORMAL_OPERATION;
253
254 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
255 pr_debug("Received CmdSN: 0x%08x is greater"
256 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
257 cmdsn, sess->exp_cmd_sn);
258 ret = CMDSN_HIGHER_THAN_EXP;
259
260 } else {
261 pr_err("Received CmdSN: 0x%08x is less than"
262 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
263 sess->exp_cmd_sn);
264 ret = CMDSN_LOWER_THAN_EXP;
265 }
266
267 return ret;
268 }
269
270 /*
271 * Commands may be received out of order if MC/S is in use.
272 * Ensure they are executed in CmdSN order.
273 */
274 int iscsit_sequence_cmd(
275 struct iscsi_conn *conn,
276 struct iscsi_cmd *cmd,
277 u32 cmdsn)
278 {
279 int ret;
280 int cmdsn_ret;
281
282 mutex_lock(&conn->sess->cmdsn_mutex);
283
284 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
285 switch (cmdsn_ret) {
286 case CMDSN_NORMAL_OPERATION:
287 ret = iscsit_execute_cmd(cmd, 0);
288 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
289 iscsit_execute_ooo_cmdsns(conn->sess);
290 break;
291 case CMDSN_HIGHER_THAN_EXP:
292 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
293 break;
294 case CMDSN_LOWER_THAN_EXP:
295 cmd->i_state = ISTATE_REMOVE;
296 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
297 ret = cmdsn_ret;
298 break;
299 default:
300 ret = cmdsn_ret;
301 break;
302 }
303 mutex_unlock(&conn->sess->cmdsn_mutex);
304
305 return ret;
306 }
307
308 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
309 {
310 struct iscsi_conn *conn = cmd->conn;
311 struct se_cmd *se_cmd = &cmd->se_cmd;
312 struct iscsi_data *hdr = (struct iscsi_data *) buf;
313 u32 payload_length = ntoh24(hdr->dlength);
314
315 if (conn->sess->sess_ops->InitialR2T) {
316 pr_err("Received unexpected unsolicited data"
317 " while InitialR2T=Yes, protocol error.\n");
318 transport_send_check_condition_and_sense(se_cmd,
319 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
320 return -1;
321 }
322
323 if ((cmd->first_burst_len + payload_length) >
324 conn->sess->sess_ops->FirstBurstLength) {
325 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
326 " for this Unsolicited DataOut Burst.\n",
327 (cmd->first_burst_len + payload_length),
328 conn->sess->sess_ops->FirstBurstLength);
329 transport_send_check_condition_and_sense(se_cmd,
330 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
331 return -1;
332 }
333
334 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
335 return 0;
336
337 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
338 ((cmd->first_burst_len + payload_length) !=
339 conn->sess->sess_ops->FirstBurstLength)) {
340 pr_err("Unsolicited non-immediate data received %u"
341 " does not equal FirstBurstLength: %u, and does"
342 " not equal ExpXferLen %u.\n",
343 (cmd->first_burst_len + payload_length),
344 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
345 transport_send_check_condition_and_sense(se_cmd,
346 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
347 return -1;
348 }
349 return 0;
350 }
351
352 struct iscsi_cmd *iscsit_find_cmd_from_itt(
353 struct iscsi_conn *conn,
354 itt_t init_task_tag)
355 {
356 struct iscsi_cmd *cmd;
357
358 spin_lock_bh(&conn->cmd_lock);
359 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
360 if (cmd->init_task_tag == init_task_tag) {
361 spin_unlock_bh(&conn->cmd_lock);
362 return cmd;
363 }
364 }
365 spin_unlock_bh(&conn->cmd_lock);
366
367 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
368 init_task_tag, conn->cid);
369 return NULL;
370 }
371
372 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
373 struct iscsi_conn *conn,
374 itt_t init_task_tag,
375 u32 length)
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 " dumping payload\n", init_task_tag, conn->cid);
390 if (length)
391 iscsit_dump_data_payload(conn, length, 1);
392
393 return NULL;
394 }
395
396 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
397 struct iscsi_conn *conn,
398 u32 targ_xfer_tag)
399 {
400 struct iscsi_cmd *cmd = NULL;
401
402 spin_lock_bh(&conn->cmd_lock);
403 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
404 if (cmd->targ_xfer_tag == targ_xfer_tag) {
405 spin_unlock_bh(&conn->cmd_lock);
406 return cmd;
407 }
408 }
409 spin_unlock_bh(&conn->cmd_lock);
410
411 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
412 targ_xfer_tag, conn->cid);
413 return NULL;
414 }
415
416 int iscsit_find_cmd_for_recovery(
417 struct iscsi_session *sess,
418 struct iscsi_cmd **cmd_ptr,
419 struct iscsi_conn_recovery **cr_ptr,
420 itt_t init_task_tag)
421 {
422 struct iscsi_cmd *cmd = NULL;
423 struct iscsi_conn_recovery *cr;
424 /*
425 * Scan through the inactive connection recovery list's command list.
426 * If init_task_tag matches the command is still alligent.
427 */
428 spin_lock(&sess->cr_i_lock);
429 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
430 spin_lock(&cr->conn_recovery_cmd_lock);
431 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
432 if (cmd->init_task_tag == init_task_tag) {
433 spin_unlock(&cr->conn_recovery_cmd_lock);
434 spin_unlock(&sess->cr_i_lock);
435
436 *cr_ptr = cr;
437 *cmd_ptr = cmd;
438 return -2;
439 }
440 }
441 spin_unlock(&cr->conn_recovery_cmd_lock);
442 }
443 spin_unlock(&sess->cr_i_lock);
444 /*
445 * Scan through the active connection recovery list's command list.
446 * If init_task_tag matches the command is ready to be reassigned.
447 */
448 spin_lock(&sess->cr_a_lock);
449 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
450 spin_lock(&cr->conn_recovery_cmd_lock);
451 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
452 if (cmd->init_task_tag == init_task_tag) {
453 spin_unlock(&cr->conn_recovery_cmd_lock);
454 spin_unlock(&sess->cr_a_lock);
455
456 *cr_ptr = cr;
457 *cmd_ptr = cmd;
458 return 0;
459 }
460 }
461 spin_unlock(&cr->conn_recovery_cmd_lock);
462 }
463 spin_unlock(&sess->cr_a_lock);
464
465 return -1;
466 }
467
468 void iscsit_add_cmd_to_immediate_queue(
469 struct iscsi_cmd *cmd,
470 struct iscsi_conn *conn,
471 u8 state)
472 {
473 struct iscsi_queue_req *qr;
474
475 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
476 if (!qr) {
477 pr_err("Unable to allocate memory for"
478 " struct iscsi_queue_req\n");
479 return;
480 }
481 INIT_LIST_HEAD(&qr->qr_list);
482 qr->cmd = cmd;
483 qr->state = state;
484
485 spin_lock_bh(&conn->immed_queue_lock);
486 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
487 atomic_inc(&cmd->immed_queue_count);
488 atomic_set(&conn->check_immediate_queue, 1);
489 spin_unlock_bh(&conn->immed_queue_lock);
490
491 wake_up_process(conn->thread_set->tx_thread);
492 }
493
494 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
495 {
496 struct iscsi_queue_req *qr;
497
498 spin_lock_bh(&conn->immed_queue_lock);
499 if (list_empty(&conn->immed_queue_list)) {
500 spin_unlock_bh(&conn->immed_queue_lock);
501 return NULL;
502 }
503 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
504 break;
505
506 list_del(&qr->qr_list);
507 if (qr->cmd)
508 atomic_dec(&qr->cmd->immed_queue_count);
509 spin_unlock_bh(&conn->immed_queue_lock);
510
511 return qr;
512 }
513
514 static void iscsit_remove_cmd_from_immediate_queue(
515 struct iscsi_cmd *cmd,
516 struct iscsi_conn *conn)
517 {
518 struct iscsi_queue_req *qr, *qr_tmp;
519
520 spin_lock_bh(&conn->immed_queue_lock);
521 if (!atomic_read(&cmd->immed_queue_count)) {
522 spin_unlock_bh(&conn->immed_queue_lock);
523 return;
524 }
525
526 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
527 if (qr->cmd != cmd)
528 continue;
529
530 atomic_dec(&qr->cmd->immed_queue_count);
531 list_del(&qr->qr_list);
532 kmem_cache_free(lio_qr_cache, qr);
533 }
534 spin_unlock_bh(&conn->immed_queue_lock);
535
536 if (atomic_read(&cmd->immed_queue_count)) {
537 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
538 cmd->init_task_tag,
539 atomic_read(&cmd->immed_queue_count));
540 }
541 }
542
543 void iscsit_add_cmd_to_response_queue(
544 struct iscsi_cmd *cmd,
545 struct iscsi_conn *conn,
546 u8 state)
547 {
548 struct iscsi_queue_req *qr;
549
550 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
551 if (!qr) {
552 pr_err("Unable to allocate memory for"
553 " struct iscsi_queue_req\n");
554 return;
555 }
556 INIT_LIST_HEAD(&qr->qr_list);
557 qr->cmd = cmd;
558 qr->state = state;
559
560 spin_lock_bh(&conn->response_queue_lock);
561 list_add_tail(&qr->qr_list, &conn->response_queue_list);
562 atomic_inc(&cmd->response_queue_count);
563 spin_unlock_bh(&conn->response_queue_lock);
564
565 wake_up_process(conn->thread_set->tx_thread);
566 }
567
568 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
569 {
570 struct iscsi_queue_req *qr;
571
572 spin_lock_bh(&conn->response_queue_lock);
573 if (list_empty(&conn->response_queue_list)) {
574 spin_unlock_bh(&conn->response_queue_lock);
575 return NULL;
576 }
577
578 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
579 break;
580
581 list_del(&qr->qr_list);
582 if (qr->cmd)
583 atomic_dec(&qr->cmd->response_queue_count);
584 spin_unlock_bh(&conn->response_queue_lock);
585
586 return qr;
587 }
588
589 static void iscsit_remove_cmd_from_response_queue(
590 struct iscsi_cmd *cmd,
591 struct iscsi_conn *conn)
592 {
593 struct iscsi_queue_req *qr, *qr_tmp;
594
595 spin_lock_bh(&conn->response_queue_lock);
596 if (!atomic_read(&cmd->response_queue_count)) {
597 spin_unlock_bh(&conn->response_queue_lock);
598 return;
599 }
600
601 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
602 qr_list) {
603 if (qr->cmd != cmd)
604 continue;
605
606 atomic_dec(&qr->cmd->response_queue_count);
607 list_del(&qr->qr_list);
608 kmem_cache_free(lio_qr_cache, qr);
609 }
610 spin_unlock_bh(&conn->response_queue_lock);
611
612 if (atomic_read(&cmd->response_queue_count)) {
613 pr_err("ITT: 0x%08x response_queue_count: %d\n",
614 cmd->init_task_tag,
615 atomic_read(&cmd->response_queue_count));
616 }
617 }
618
619 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
620 {
621 struct iscsi_queue_req *qr, *qr_tmp;
622
623 spin_lock_bh(&conn->immed_queue_lock);
624 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
625 list_del(&qr->qr_list);
626 if (qr->cmd)
627 atomic_dec(&qr->cmd->immed_queue_count);
628
629 kmem_cache_free(lio_qr_cache, qr);
630 }
631 spin_unlock_bh(&conn->immed_queue_lock);
632
633 spin_lock_bh(&conn->response_queue_lock);
634 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
635 qr_list) {
636 list_del(&qr->qr_list);
637 if (qr->cmd)
638 atomic_dec(&qr->cmd->response_queue_count);
639
640 kmem_cache_free(lio_qr_cache, qr);
641 }
642 spin_unlock_bh(&conn->response_queue_lock);
643 }
644
645 void iscsit_release_cmd(struct iscsi_cmd *cmd)
646 {
647 struct iscsi_conn *conn = cmd->conn;
648
649 iscsit_free_r2ts_from_list(cmd);
650 iscsit_free_all_datain_reqs(cmd);
651
652 kfree(cmd->buf_ptr);
653 kfree(cmd->pdu_list);
654 kfree(cmd->seq_list);
655 kfree(cmd->tmr_req);
656 kfree(cmd->iov_data);
657
658 if (conn) {
659 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
660 iscsit_remove_cmd_from_response_queue(cmd, conn);
661 }
662
663 kmem_cache_free(lio_cmd_cache, cmd);
664 }
665
666 void iscsit_free_cmd(struct iscsi_cmd *cmd)
667 {
668 /*
669 * Determine if a struct se_cmd is assoicated with
670 * this struct iscsi_cmd.
671 */
672 switch (cmd->iscsi_opcode) {
673 case ISCSI_OP_SCSI_CMD:
674 case ISCSI_OP_SCSI_TMFUNC:
675 transport_generic_free_cmd(&cmd->se_cmd, 1);
676 break;
677 case ISCSI_OP_REJECT:
678 /*
679 * Handle special case for REJECT when iscsi_add_reject*() has
680 * overwritten the original iscsi_opcode assignment, and the
681 * associated cmd->se_cmd needs to be released.
682 */
683 if (cmd->se_cmd.se_tfo != NULL) {
684 transport_generic_free_cmd(&cmd->se_cmd, 1);
685 break;
686 }
687 /* Fall-through */
688 default:
689 iscsit_release_cmd(cmd);
690 break;
691 }
692 }
693
694 int iscsit_check_session_usage_count(struct iscsi_session *sess)
695 {
696 spin_lock_bh(&sess->session_usage_lock);
697 if (sess->session_usage_count != 0) {
698 sess->session_waiting_on_uc = 1;
699 spin_unlock_bh(&sess->session_usage_lock);
700 if (in_interrupt())
701 return 2;
702
703 wait_for_completion(&sess->session_waiting_on_uc_comp);
704 return 1;
705 }
706 spin_unlock_bh(&sess->session_usage_lock);
707
708 return 0;
709 }
710
711 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
712 {
713 spin_lock_bh(&sess->session_usage_lock);
714 sess->session_usage_count--;
715
716 if (!sess->session_usage_count && sess->session_waiting_on_uc)
717 complete(&sess->session_waiting_on_uc_comp);
718
719 spin_unlock_bh(&sess->session_usage_lock);
720 }
721
722 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
723 {
724 spin_lock_bh(&sess->session_usage_lock);
725 sess->session_usage_count++;
726 spin_unlock_bh(&sess->session_usage_lock);
727 }
728
729 /*
730 * Setup conn->if_marker and conn->of_marker values based upon
731 * the initial marker-less interval. (see iSCSI v19 A.2)
732 */
733 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
734 {
735 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
736 /*
737 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
738 */
739 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
740 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
741
742 if (conn->conn_ops->OFMarker) {
743 /*
744 * Account for the first Login Command received not
745 * via iscsi_recv_msg().
746 */
747 conn->of_marker += ISCSI_HDR_LEN;
748 if (conn->of_marker <= OFMarkInt) {
749 conn->of_marker = (OFMarkInt - conn->of_marker);
750 } else {
751 login_ofmarker_count = (conn->of_marker / OFMarkInt);
752 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
753 (login_ofmarker_count * MARKER_SIZE);
754 conn->of_marker = (next_marker - conn->of_marker);
755 }
756 conn->of_marker_offset = 0;
757 pr_debug("Setting OFMarker value to %u based on Initial"
758 " Markerless Interval.\n", conn->of_marker);
759 }
760
761 if (conn->conn_ops->IFMarker) {
762 if (conn->if_marker <= IFMarkInt) {
763 conn->if_marker = (IFMarkInt - conn->if_marker);
764 } else {
765 login_ifmarker_count = (conn->if_marker / IFMarkInt);
766 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
767 (login_ifmarker_count * MARKER_SIZE);
768 conn->if_marker = (next_marker - conn->if_marker);
769 }
770 pr_debug("Setting IFMarker value to %u based on Initial"
771 " Markerless Interval.\n", conn->if_marker);
772 }
773
774 return 0;
775 }
776
777 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
778 {
779 struct iscsi_conn *conn;
780
781 spin_lock_bh(&sess->conn_lock);
782 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
783 if ((conn->cid == cid) &&
784 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
785 iscsit_inc_conn_usage_count(conn);
786 spin_unlock_bh(&sess->conn_lock);
787 return conn;
788 }
789 }
790 spin_unlock_bh(&sess->conn_lock);
791
792 return NULL;
793 }
794
795 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
796 {
797 struct iscsi_conn *conn;
798
799 spin_lock_bh(&sess->conn_lock);
800 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
801 if (conn->cid == cid) {
802 iscsit_inc_conn_usage_count(conn);
803 spin_lock(&conn->state_lock);
804 atomic_set(&conn->connection_wait_rcfr, 1);
805 spin_unlock(&conn->state_lock);
806 spin_unlock_bh(&sess->conn_lock);
807 return conn;
808 }
809 }
810 spin_unlock_bh(&sess->conn_lock);
811
812 return NULL;
813 }
814
815 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
816 {
817 spin_lock_bh(&conn->conn_usage_lock);
818 if (conn->conn_usage_count != 0) {
819 conn->conn_waiting_on_uc = 1;
820 spin_unlock_bh(&conn->conn_usage_lock);
821
822 wait_for_completion(&conn->conn_waiting_on_uc_comp);
823 return;
824 }
825 spin_unlock_bh(&conn->conn_usage_lock);
826 }
827
828 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
829 {
830 spin_lock_bh(&conn->conn_usage_lock);
831 conn->conn_usage_count--;
832
833 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
834 complete(&conn->conn_waiting_on_uc_comp);
835
836 spin_unlock_bh(&conn->conn_usage_lock);
837 }
838
839 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
840 {
841 spin_lock_bh(&conn->conn_usage_lock);
842 conn->conn_usage_count++;
843 spin_unlock_bh(&conn->conn_usage_lock);
844 }
845
846 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
847 {
848 u8 state;
849 struct iscsi_cmd *cmd;
850
851 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
852 if (!cmd)
853 return -1;
854
855 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
856 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
857 ISTATE_SEND_NOPIN_NO_RESPONSE;
858 cmd->init_task_tag = RESERVED_ITT;
859 spin_lock_bh(&conn->sess->ttt_lock);
860 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
861 0xFFFFFFFF;
862 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
863 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
864 spin_unlock_bh(&conn->sess->ttt_lock);
865
866 spin_lock_bh(&conn->cmd_lock);
867 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
868 spin_unlock_bh(&conn->cmd_lock);
869
870 if (want_response)
871 iscsit_start_nopin_response_timer(conn);
872 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
873
874 return 0;
875 }
876
877 static void iscsit_handle_nopin_response_timeout(unsigned long data)
878 {
879 struct iscsi_conn *conn = (struct iscsi_conn *) data;
880
881 iscsit_inc_conn_usage_count(conn);
882
883 spin_lock_bh(&conn->nopin_timer_lock);
884 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
885 spin_unlock_bh(&conn->nopin_timer_lock);
886 iscsit_dec_conn_usage_count(conn);
887 return;
888 }
889
890 pr_debug("Did not receive response to NOPIN on CID: %hu on"
891 " SID: %u, failing connection.\n", conn->cid,
892 conn->sess->sid);
893 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
894 spin_unlock_bh(&conn->nopin_timer_lock);
895
896 {
897 struct iscsi_portal_group *tpg = conn->sess->tpg;
898 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
899
900 if (tiqn) {
901 spin_lock_bh(&tiqn->sess_err_stats.lock);
902 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
903 conn->sess->sess_ops->InitiatorName);
904 tiqn->sess_err_stats.last_sess_failure_type =
905 ISCSI_SESS_ERR_CXN_TIMEOUT;
906 tiqn->sess_err_stats.cxn_timeout_errors++;
907 conn->sess->conn_timeout_errors++;
908 spin_unlock_bh(&tiqn->sess_err_stats.lock);
909 }
910 }
911
912 iscsit_cause_connection_reinstatement(conn, 0);
913 iscsit_dec_conn_usage_count(conn);
914 }
915
916 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
917 {
918 struct iscsi_session *sess = conn->sess;
919 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
920
921 spin_lock_bh(&conn->nopin_timer_lock);
922 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
923 spin_unlock_bh(&conn->nopin_timer_lock);
924 return;
925 }
926
927 mod_timer(&conn->nopin_response_timer,
928 (get_jiffies_64() + na->nopin_response_timeout * HZ));
929 spin_unlock_bh(&conn->nopin_timer_lock);
930 }
931
932 /*
933 * Called with conn->nopin_timer_lock held.
934 */
935 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
936 {
937 struct iscsi_session *sess = conn->sess;
938 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
939
940 spin_lock_bh(&conn->nopin_timer_lock);
941 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
942 spin_unlock_bh(&conn->nopin_timer_lock);
943 return;
944 }
945
946 init_timer(&conn->nopin_response_timer);
947 conn->nopin_response_timer.expires =
948 (get_jiffies_64() + na->nopin_response_timeout * HZ);
949 conn->nopin_response_timer.data = (unsigned long)conn;
950 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
951 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
952 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
953 add_timer(&conn->nopin_response_timer);
954
955 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
956 " seconds\n", conn->cid, na->nopin_response_timeout);
957 spin_unlock_bh(&conn->nopin_timer_lock);
958 }
959
960 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
961 {
962 spin_lock_bh(&conn->nopin_timer_lock);
963 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
964 spin_unlock_bh(&conn->nopin_timer_lock);
965 return;
966 }
967 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
968 spin_unlock_bh(&conn->nopin_timer_lock);
969
970 del_timer_sync(&conn->nopin_response_timer);
971
972 spin_lock_bh(&conn->nopin_timer_lock);
973 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
974 spin_unlock_bh(&conn->nopin_timer_lock);
975 }
976
977 static void iscsit_handle_nopin_timeout(unsigned long data)
978 {
979 struct iscsi_conn *conn = (struct iscsi_conn *) data;
980
981 iscsit_inc_conn_usage_count(conn);
982
983 spin_lock_bh(&conn->nopin_timer_lock);
984 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
985 spin_unlock_bh(&conn->nopin_timer_lock);
986 iscsit_dec_conn_usage_count(conn);
987 return;
988 }
989 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
990 spin_unlock_bh(&conn->nopin_timer_lock);
991
992 iscsit_add_nopin(conn, 1);
993 iscsit_dec_conn_usage_count(conn);
994 }
995
996 /*
997 * Called with conn->nopin_timer_lock held.
998 */
999 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1000 {
1001 struct iscsi_session *sess = conn->sess;
1002 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1003 /*
1004 * NOPIN timeout is disabled.
1005 */
1006 if (!na->nopin_timeout)
1007 return;
1008
1009 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1010 return;
1011
1012 init_timer(&conn->nopin_timer);
1013 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1014 conn->nopin_timer.data = (unsigned long)conn;
1015 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1016 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1017 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1018 add_timer(&conn->nopin_timer);
1019
1020 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1021 " interval\n", conn->cid, na->nopin_timeout);
1022 }
1023
1024 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1025 {
1026 struct iscsi_session *sess = conn->sess;
1027 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1028 /*
1029 * NOPIN timeout is disabled..
1030 */
1031 if (!na->nopin_timeout)
1032 return;
1033
1034 spin_lock_bh(&conn->nopin_timer_lock);
1035 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1036 spin_unlock_bh(&conn->nopin_timer_lock);
1037 return;
1038 }
1039
1040 init_timer(&conn->nopin_timer);
1041 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1042 conn->nopin_timer.data = (unsigned long)conn;
1043 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1044 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1045 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1046 add_timer(&conn->nopin_timer);
1047
1048 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1049 " interval\n", conn->cid, na->nopin_timeout);
1050 spin_unlock_bh(&conn->nopin_timer_lock);
1051 }
1052
1053 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1054 {
1055 spin_lock_bh(&conn->nopin_timer_lock);
1056 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1057 spin_unlock_bh(&conn->nopin_timer_lock);
1058 return;
1059 }
1060 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1061 spin_unlock_bh(&conn->nopin_timer_lock);
1062
1063 del_timer_sync(&conn->nopin_timer);
1064
1065 spin_lock_bh(&conn->nopin_timer_lock);
1066 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1067 spin_unlock_bh(&conn->nopin_timer_lock);
1068 }
1069
1070 int iscsit_send_tx_data(
1071 struct iscsi_cmd *cmd,
1072 struct iscsi_conn *conn,
1073 int use_misc)
1074 {
1075 int tx_sent, tx_size;
1076 u32 iov_count;
1077 struct kvec *iov;
1078
1079 send_data:
1080 tx_size = cmd->tx_size;
1081
1082 if (!use_misc) {
1083 iov = &cmd->iov_data[0];
1084 iov_count = cmd->iov_data_count;
1085 } else {
1086 iov = &cmd->iov_misc[0];
1087 iov_count = cmd->iov_misc_count;
1088 }
1089
1090 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1091 if (tx_size != tx_sent) {
1092 if (tx_sent == -EAGAIN) {
1093 pr_err("tx_data() returned -EAGAIN\n");
1094 goto send_data;
1095 } else
1096 return -1;
1097 }
1098 cmd->tx_size = 0;
1099
1100 return 0;
1101 }
1102
1103 int iscsit_fe_sendpage_sg(
1104 struct iscsi_cmd *cmd,
1105 struct iscsi_conn *conn)
1106 {
1107 struct scatterlist *sg = cmd->first_data_sg;
1108 struct kvec iov;
1109 u32 tx_hdr_size, data_len;
1110 u32 offset = cmd->first_data_sg_off;
1111 int tx_sent, iov_off;
1112
1113 send_hdr:
1114 tx_hdr_size = ISCSI_HDR_LEN;
1115 if (conn->conn_ops->HeaderDigest)
1116 tx_hdr_size += ISCSI_CRC_LEN;
1117
1118 iov.iov_base = cmd->pdu;
1119 iov.iov_len = tx_hdr_size;
1120
1121 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1122 if (tx_hdr_size != tx_sent) {
1123 if (tx_sent == -EAGAIN) {
1124 pr_err("tx_data() returned -EAGAIN\n");
1125 goto send_hdr;
1126 }
1127 return -1;
1128 }
1129
1130 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1131 /*
1132 * Set iov_off used by padding and data digest tx_data() calls below
1133 * in order to determine proper offset into cmd->iov_data[]
1134 */
1135 if (conn->conn_ops->DataDigest) {
1136 data_len -= ISCSI_CRC_LEN;
1137 if (cmd->padding)
1138 iov_off = (cmd->iov_data_count - 2);
1139 else
1140 iov_off = (cmd->iov_data_count - 1);
1141 } else {
1142 iov_off = (cmd->iov_data_count - 1);
1143 }
1144 /*
1145 * Perform sendpage() for each page in the scatterlist
1146 */
1147 while (data_len) {
1148 u32 space = (sg->length - offset);
1149 u32 sub_len = min_t(u32, data_len, space);
1150 send_pg:
1151 tx_sent = conn->sock->ops->sendpage(conn->sock,
1152 sg_page(sg), sg->offset + offset, sub_len, 0);
1153 if (tx_sent != sub_len) {
1154 if (tx_sent == -EAGAIN) {
1155 pr_err("tcp_sendpage() returned"
1156 " -EAGAIN\n");
1157 goto send_pg;
1158 }
1159
1160 pr_err("tcp_sendpage() failure: %d\n",
1161 tx_sent);
1162 return -1;
1163 }
1164
1165 data_len -= sub_len;
1166 offset = 0;
1167 sg = sg_next(sg);
1168 }
1169
1170 send_padding:
1171 if (cmd->padding) {
1172 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1173
1174 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1175 if (cmd->padding != tx_sent) {
1176 if (tx_sent == -EAGAIN) {
1177 pr_err("tx_data() returned -EAGAIN\n");
1178 goto send_padding;
1179 }
1180 return -1;
1181 }
1182 }
1183
1184 send_datacrc:
1185 if (conn->conn_ops->DataDigest) {
1186 struct kvec *iov_d = &cmd->iov_data[iov_off];
1187
1188 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1189 if (ISCSI_CRC_LEN != tx_sent) {
1190 if (tx_sent == -EAGAIN) {
1191 pr_err("tx_data() returned -EAGAIN\n");
1192 goto send_datacrc;
1193 }
1194 return -1;
1195 }
1196 }
1197
1198 return 0;
1199 }
1200
1201 /*
1202 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1203 * back to the Initiator when an expection condition occurs with the
1204 * errors set in status_class and status_detail.
1205 *
1206 * Parameters: iSCSI Connection, Status Class, Status Detail.
1207 * Returns: 0 on success, -1 on error.
1208 */
1209 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1210 {
1211 u8 iscsi_hdr[ISCSI_HDR_LEN];
1212 int err;
1213 struct kvec iov;
1214 struct iscsi_login_rsp *hdr;
1215
1216 iscsit_collect_login_stats(conn, status_class, status_detail);
1217
1218 memset(&iov, 0, sizeof(struct kvec));
1219 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1220
1221 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1222 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1223 hdr->status_class = status_class;
1224 hdr->status_detail = status_detail;
1225 hdr->itt = conn->login_itt;
1226
1227 iov.iov_base = &iscsi_hdr;
1228 iov.iov_len = ISCSI_HDR_LEN;
1229
1230 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1231
1232 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1233 if (err != ISCSI_HDR_LEN) {
1234 pr_err("tx_data returned less than expected\n");
1235 return -1;
1236 }
1237
1238 return 0;
1239 }
1240
1241 void iscsit_print_session_params(struct iscsi_session *sess)
1242 {
1243 struct iscsi_conn *conn;
1244
1245 pr_debug("-----------------------------[Session Params for"
1246 " SID: %u]-----------------------------\n", sess->sid);
1247 spin_lock_bh(&sess->conn_lock);
1248 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1249 iscsi_dump_conn_ops(conn->conn_ops);
1250 spin_unlock_bh(&sess->conn_lock);
1251
1252 iscsi_dump_sess_ops(sess->sess_ops);
1253 }
1254
1255 static int iscsit_do_rx_data(
1256 struct iscsi_conn *conn,
1257 struct iscsi_data_count *count)
1258 {
1259 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1260 struct kvec *iov_p;
1261 struct msghdr msg;
1262
1263 if (!conn || !conn->sock || !conn->conn_ops)
1264 return -1;
1265
1266 memset(&msg, 0, sizeof(struct msghdr));
1267
1268 iov_p = count->iov;
1269 iov_len = count->iov_count;
1270
1271 while (total_rx < data) {
1272 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1273 (data - total_rx), MSG_WAITALL);
1274 if (rx_loop <= 0) {
1275 pr_debug("rx_loop: %d total_rx: %d\n",
1276 rx_loop, total_rx);
1277 return rx_loop;
1278 }
1279 total_rx += rx_loop;
1280 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1281 rx_loop, total_rx, data);
1282 }
1283
1284 return total_rx;
1285 }
1286
1287 static int iscsit_do_tx_data(
1288 struct iscsi_conn *conn,
1289 struct iscsi_data_count *count)
1290 {
1291 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1292 struct kvec *iov_p;
1293 struct msghdr msg;
1294
1295 if (!conn || !conn->sock || !conn->conn_ops)
1296 return -1;
1297
1298 if (data <= 0) {
1299 pr_err("Data length is: %d\n", data);
1300 return -1;
1301 }
1302
1303 memset(&msg, 0, sizeof(struct msghdr));
1304
1305 iov_p = count->iov;
1306 iov_len = count->iov_count;
1307
1308 while (total_tx < data) {
1309 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1310 (data - total_tx));
1311 if (tx_loop <= 0) {
1312 pr_debug("tx_loop: %d total_tx %d\n",
1313 tx_loop, total_tx);
1314 return tx_loop;
1315 }
1316 total_tx += tx_loop;
1317 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1318 tx_loop, total_tx, data);
1319 }
1320
1321 return total_tx;
1322 }
1323
1324 int rx_data(
1325 struct iscsi_conn *conn,
1326 struct kvec *iov,
1327 int iov_count,
1328 int data)
1329 {
1330 struct iscsi_data_count c;
1331
1332 if (!conn || !conn->sock || !conn->conn_ops)
1333 return -1;
1334
1335 memset(&c, 0, sizeof(struct iscsi_data_count));
1336 c.iov = iov;
1337 c.iov_count = iov_count;
1338 c.data_length = data;
1339 c.type = ISCSI_RX_DATA;
1340
1341 return iscsit_do_rx_data(conn, &c);
1342 }
1343
1344 int tx_data(
1345 struct iscsi_conn *conn,
1346 struct kvec *iov,
1347 int iov_count,
1348 int data)
1349 {
1350 struct iscsi_data_count c;
1351
1352 if (!conn || !conn->sock || !conn->conn_ops)
1353 return -1;
1354
1355 memset(&c, 0, sizeof(struct iscsi_data_count));
1356 c.iov = iov;
1357 c.iov_count = iov_count;
1358 c.data_length = data;
1359 c.type = ISCSI_TX_DATA;
1360
1361 return iscsit_do_tx_data(conn, &c);
1362 }
1363
1364 void iscsit_collect_login_stats(
1365 struct iscsi_conn *conn,
1366 u8 status_class,
1367 u8 status_detail)
1368 {
1369 struct iscsi_param *intrname = NULL;
1370 struct iscsi_tiqn *tiqn;
1371 struct iscsi_login_stats *ls;
1372
1373 tiqn = iscsit_snmp_get_tiqn(conn);
1374 if (!tiqn)
1375 return;
1376
1377 ls = &tiqn->login_stats;
1378
1379 spin_lock(&ls->lock);
1380 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1381 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1382 /* We already have the failure info for this login */
1383 spin_unlock(&ls->lock);
1384 return;
1385 }
1386
1387 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1388 ls->accepts++;
1389 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1390 ls->redirects++;
1391 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1392 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1393 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1394 ls->authenticate_fails++;
1395 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1396 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1397 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1398 ls->authorize_fails++;
1399 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1400 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1401 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1402 ls->negotiate_fails++;
1403 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1404 } else {
1405 ls->other_fails++;
1406 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1407 }
1408
1409 /* Save initiator name, ip address and time, if it is a failed login */
1410 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1411 if (conn->param_list)
1412 intrname = iscsi_find_param_from_key(INITIATORNAME,
1413 conn->param_list);
1414 strcpy(ls->last_intr_fail_name,
1415 (intrname ? intrname->value : "Unknown"));
1416
1417 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1418 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1419 "%s", conn->login_ip);
1420 ls->last_fail_time = get_jiffies_64();
1421 }
1422
1423 spin_unlock(&ls->lock);
1424 }
1425
1426 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1427 {
1428 struct iscsi_portal_group *tpg;
1429
1430 if (!conn || !conn->sess)
1431 return NULL;
1432
1433 tpg = conn->sess->tpg;
1434 if (!tpg)
1435 return NULL;
1436
1437 if (!tpg->tpg_tiqn)
1438 return NULL;
1439
1440 return tpg->tpg_tiqn;
1441 }
Linux kernel - Deliverables
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