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19#include <linux/list.h>
20#include <linux/percpu_ida.h>
21#include <scsi/scsi_tcq.h>
22#include <scsi/iscsi_proto.h>
23#include <target/target_core_base.h>
24#include <target/target_core_fabric.h>
25#include <target/target_core_configfs.h>
26#include <target/iscsi/iscsi_transport.h>
27
28#include "iscsi_target_core.h"
29#include "iscsi_target_parameters.h"
30#include "iscsi_target_seq_pdu_list.h"
31#include "iscsi_target_datain_values.h"
32#include "iscsi_target_erl0.h"
33#include "iscsi_target_erl1.h"
34#include "iscsi_target_erl2.h"
35#include "iscsi_target_tpg.h"
36#include "iscsi_target_tq.h"
37#include "iscsi_target_util.h"
38#include "iscsi_target.h"
39
40#define PRINT_BUFF(buff, len) \
41{ \
42 int zzz; \
43 \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
47 if (zzz) \
48 pr_debug("\n"); \
49 pr_debug("%4i: ", zzz); \
50 } \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
52 } \
53 if ((len + 1) % 16) \
54 pr_debug("\n"); \
55}
56
57extern struct list_head g_tiqn_list;
58extern spinlock_t tiqn_lock;
59
60
61
62
63int 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
92struct 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
114struct 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
134
135void 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
141void 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
153
154
155struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
156{
157 struct iscsi_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag;
160
161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
162 if (tag < 0)
163 return NULL;
164
165 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
166 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
167 memset(cmd, 0, size);
168
169 cmd->se_cmd.map_tag = tag;
170 cmd->conn = conn;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
179
180 return cmd;
181}
182EXPORT_SYMBOL(iscsit_allocate_cmd);
183
184struct iscsi_seq *iscsit_get_seq_holder_for_datain(
185 struct iscsi_cmd *cmd,
186 u32 seq_send_order)
187{
188 u32 i;
189
190 for (i = 0; i < cmd->seq_count; i++)
191 if (cmd->seq_list[i].seq_send_order == seq_send_order)
192 return &cmd->seq_list[i];
193
194 return NULL;
195}
196
197struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
198{
199 u32 i;
200
201 if (!cmd->seq_list) {
202 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
203 return NULL;
204 }
205
206 for (i = 0; i < cmd->seq_count; i++) {
207 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
208 continue;
209 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
210 cmd->seq_send_order++;
211 return &cmd->seq_list[i];
212 }
213 }
214
215 return NULL;
216}
217
218struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
219 struct iscsi_cmd *cmd,
220 u32 r2t_sn)
221{
222 struct iscsi_r2t *r2t;
223
224 spin_lock_bh(&cmd->r2t_lock);
225 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
226 if (r2t->r2t_sn == r2t_sn) {
227 spin_unlock_bh(&cmd->r2t_lock);
228 return r2t;
229 }
230 }
231 spin_unlock_bh(&cmd->r2t_lock);
232
233 return NULL;
234}
235
236static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
237{
238 int ret;
239
240
241
242
243
244
245
246 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
247 pr_err("Received CmdSN: 0x%08x is greater than"
248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
249 sess->max_cmd_sn);
250 ret = CMDSN_MAXCMDSN_OVERRUN;
251
252 } else if (cmdsn == sess->exp_cmd_sn) {
253 sess->exp_cmd_sn++;
254 pr_debug("Received CmdSN matches ExpCmdSN,"
255 " incremented ExpCmdSN to: 0x%08x\n",
256 sess->exp_cmd_sn);
257 ret = CMDSN_NORMAL_OPERATION;
258
259 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
260 pr_debug("Received CmdSN: 0x%08x is greater"
261 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
262 cmdsn, sess->exp_cmd_sn);
263 ret = CMDSN_HIGHER_THAN_EXP;
264
265 } else {
266 pr_err("Received CmdSN: 0x%08x is less than"
267 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
268 sess->exp_cmd_sn);
269 ret = CMDSN_LOWER_THAN_EXP;
270 }
271
272 return ret;
273}
274
275
276
277
278
279int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
280 unsigned char *buf, __be32 cmdsn)
281{
282 int ret, cmdsn_ret;
283 bool reject = false;
284 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
285
286 mutex_lock(&conn->sess->cmdsn_mutex);
287
288 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
289 switch (cmdsn_ret) {
290 case CMDSN_NORMAL_OPERATION:
291 ret = iscsit_execute_cmd(cmd, 0);
292 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
293 iscsit_execute_ooo_cmdsns(conn->sess);
294 else if (ret < 0) {
295 reject = true;
296 ret = CMDSN_ERROR_CANNOT_RECOVER;
297 }
298 break;
299 case CMDSN_HIGHER_THAN_EXP:
300 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
301 if (ret < 0) {
302 reject = true;
303 ret = CMDSN_ERROR_CANNOT_RECOVER;
304 break;
305 }
306 ret = CMDSN_HIGHER_THAN_EXP;
307 break;
308 case CMDSN_LOWER_THAN_EXP:
309 case CMDSN_MAXCMDSN_OVERRUN:
310 default:
311 cmd->i_state = ISTATE_REMOVE;
312 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
313
314
315
316
317
318 ret = CMDSN_LOWER_THAN_EXP;
319 break;
320 }
321 mutex_unlock(&conn->sess->cmdsn_mutex);
322
323 if (reject)
324 iscsit_reject_cmd(cmd, reason, buf);
325
326 return ret;
327}
328EXPORT_SYMBOL(iscsit_sequence_cmd);
329
330int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
331{
332 struct iscsi_conn *conn = cmd->conn;
333 struct se_cmd *se_cmd = &cmd->se_cmd;
334 struct iscsi_data *hdr = (struct iscsi_data *) buf;
335 u32 payload_length = ntoh24(hdr->dlength);
336
337 if (conn->sess->sess_ops->InitialR2T) {
338 pr_err("Received unexpected unsolicited data"
339 " while InitialR2T=Yes, protocol error.\n");
340 transport_send_check_condition_and_sense(se_cmd,
341 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
342 return -1;
343 }
344
345 if ((cmd->first_burst_len + payload_length) >
346 conn->sess->sess_ops->FirstBurstLength) {
347 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
348 " for this Unsolicited DataOut Burst.\n",
349 (cmd->first_burst_len + payload_length),
350 conn->sess->sess_ops->FirstBurstLength);
351 transport_send_check_condition_and_sense(se_cmd,
352 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
353 return -1;
354 }
355
356 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
357 return 0;
358
359 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
360 ((cmd->first_burst_len + payload_length) !=
361 conn->sess->sess_ops->FirstBurstLength)) {
362 pr_err("Unsolicited non-immediate data received %u"
363 " does not equal FirstBurstLength: %u, and does"
364 " not equal ExpXferLen %u.\n",
365 (cmd->first_burst_len + payload_length),
366 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
367 transport_send_check_condition_and_sense(se_cmd,
368 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
369 return -1;
370 }
371 return 0;
372}
373
374struct iscsi_cmd *iscsit_find_cmd_from_itt(
375 struct iscsi_conn *conn,
376 itt_t init_task_tag)
377{
378 struct iscsi_cmd *cmd;
379
380 spin_lock_bh(&conn->cmd_lock);
381 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
382 if (cmd->init_task_tag == init_task_tag) {
383 spin_unlock_bh(&conn->cmd_lock);
384 return cmd;
385 }
386 }
387 spin_unlock_bh(&conn->cmd_lock);
388
389 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
390 init_task_tag, conn->cid);
391 return NULL;
392}
393
394struct 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
420struct 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
440int 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
450
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
470
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
492void 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
518struct 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
538static 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
567void 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
592struct 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
613static 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
643bool 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
661void 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
687void 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}
708EXPORT_SYMBOL(iscsit_release_cmd);
709
710void __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
730void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
731{
732 struct se_cmd *se_cmd = NULL;
733 int rc;
734
735
736
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
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
755
756
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
770 default:
771 __iscsit_free_cmd(cmd, false, shutdown);
772 iscsit_release_cmd(cmd);
773 break;
774 }
775}
776
777int 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
794void 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
805void 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
814
815
816int 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
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
828
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
860struct 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
878struct 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
898void 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
911void 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
922void 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
929static 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 spin_lock_bh(&conn->sess->ttt_lock);
943 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
944 0xFFFFFFFF;
945 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
946 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
947 spin_unlock_bh(&conn->sess->ttt_lock);
948
949 spin_lock_bh(&conn->cmd_lock);
950 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
951 spin_unlock_bh(&conn->cmd_lock);
952
953 if (want_response)
954 iscsit_start_nopin_response_timer(conn);
955 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
956
957 return 0;
958}
959
960static void iscsit_handle_nopin_response_timeout(unsigned long data)
961{
962 struct iscsi_conn *conn = (struct iscsi_conn *) data;
963
964 iscsit_inc_conn_usage_count(conn);
965
966 spin_lock_bh(&conn->nopin_timer_lock);
967 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
968 spin_unlock_bh(&conn->nopin_timer_lock);
969 iscsit_dec_conn_usage_count(conn);
970 return;
971 }
972
973 pr_debug("Did not receive response to NOPIN on CID: %hu on"
974 " SID: %u, failing connection.\n", conn->cid,
975 conn->sess->sid);
976 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
977 spin_unlock_bh(&conn->nopin_timer_lock);
978
979 {
980 struct iscsi_portal_group *tpg = conn->sess->tpg;
981 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
982
983 if (tiqn) {
984 spin_lock_bh(&tiqn->sess_err_stats.lock);
985 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
986 conn->sess->sess_ops->InitiatorName);
987 tiqn->sess_err_stats.last_sess_failure_type =
988 ISCSI_SESS_ERR_CXN_TIMEOUT;
989 tiqn->sess_err_stats.cxn_timeout_errors++;
990 atomic_long_inc(&conn->sess->conn_timeout_errors);
991 spin_unlock_bh(&tiqn->sess_err_stats.lock);
992 }
993 }
994
995 iscsit_cause_connection_reinstatement(conn, 0);
996 iscsit_dec_conn_usage_count(conn);
997}
998
999void iscsit_mod_nopin_response_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 spin_lock_bh(&conn->nopin_timer_lock);
1005 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1006 spin_unlock_bh(&conn->nopin_timer_lock);
1007 return;
1008 }
1009
1010 mod_timer(&conn->nopin_response_timer,
1011 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1012 spin_unlock_bh(&conn->nopin_timer_lock);
1013}
1014
1015
1016
1017
1018void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1019{
1020 struct iscsi_session *sess = conn->sess;
1021 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1022
1023 spin_lock_bh(&conn->nopin_timer_lock);
1024 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1025 spin_unlock_bh(&conn->nopin_timer_lock);
1026 return;
1027 }
1028
1029 init_timer(&conn->nopin_response_timer);
1030 conn->nopin_response_timer.expires =
1031 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1032 conn->nopin_response_timer.data = (unsigned long)conn;
1033 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1035 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1036 add_timer(&conn->nopin_response_timer);
1037
1038 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1039 " seconds\n", conn->cid, na->nopin_response_timeout);
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1041}
1042
1043void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1044{
1045 spin_lock_bh(&conn->nopin_timer_lock);
1046 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1047 spin_unlock_bh(&conn->nopin_timer_lock);
1048 return;
1049 }
1050 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1051 spin_unlock_bh(&conn->nopin_timer_lock);
1052
1053 del_timer_sync(&conn->nopin_response_timer);
1054
1055 spin_lock_bh(&conn->nopin_timer_lock);
1056 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1057 spin_unlock_bh(&conn->nopin_timer_lock);
1058}
1059
1060static void iscsit_handle_nopin_timeout(unsigned long data)
1061{
1062 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1063
1064 iscsit_inc_conn_usage_count(conn);
1065
1066 spin_lock_bh(&conn->nopin_timer_lock);
1067 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1069 iscsit_dec_conn_usage_count(conn);
1070 return;
1071 }
1072 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1073 spin_unlock_bh(&conn->nopin_timer_lock);
1074
1075 iscsit_add_nopin(conn, 1);
1076 iscsit_dec_conn_usage_count(conn);
1077}
1078
1079
1080
1081
1082void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1083{
1084 struct iscsi_session *sess = conn->sess;
1085 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1086
1087
1088
1089 if (!na->nopin_timeout)
1090 return;
1091
1092 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1093 return;
1094
1095 init_timer(&conn->nopin_timer);
1096 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1097 conn->nopin_timer.data = (unsigned long)conn;
1098 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1099 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1100 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1101 add_timer(&conn->nopin_timer);
1102
1103 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1104 " interval\n", conn->cid, na->nopin_timeout);
1105}
1106
1107void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1108{
1109 struct iscsi_session *sess = conn->sess;
1110 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1111
1112
1113
1114 if (!na->nopin_timeout)
1115 return;
1116
1117 spin_lock_bh(&conn->nopin_timer_lock);
1118 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1119 spin_unlock_bh(&conn->nopin_timer_lock);
1120 return;
1121 }
1122
1123 init_timer(&conn->nopin_timer);
1124 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1125 conn->nopin_timer.data = (unsigned long)conn;
1126 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1127 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1128 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1129 add_timer(&conn->nopin_timer);
1130
1131 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1132 " interval\n", conn->cid, na->nopin_timeout);
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1134}
1135
1136void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1137{
1138 spin_lock_bh(&conn->nopin_timer_lock);
1139 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1140 spin_unlock_bh(&conn->nopin_timer_lock);
1141 return;
1142 }
1143 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1144 spin_unlock_bh(&conn->nopin_timer_lock);
1145
1146 del_timer_sync(&conn->nopin_timer);
1147
1148 spin_lock_bh(&conn->nopin_timer_lock);
1149 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1150 spin_unlock_bh(&conn->nopin_timer_lock);
1151}
1152
1153int iscsit_send_tx_data(
1154 struct iscsi_cmd *cmd,
1155 struct iscsi_conn *conn,
1156 int use_misc)
1157{
1158 int tx_sent, tx_size;
1159 u32 iov_count;
1160 struct kvec *iov;
1161
1162send_data:
1163 tx_size = cmd->tx_size;
1164
1165 if (!use_misc) {
1166 iov = &cmd->iov_data[0];
1167 iov_count = cmd->iov_data_count;
1168 } else {
1169 iov = &cmd->iov_misc[0];
1170 iov_count = cmd->iov_misc_count;
1171 }
1172
1173 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1174 if (tx_size != tx_sent) {
1175 if (tx_sent == -EAGAIN) {
1176 pr_err("tx_data() returned -EAGAIN\n");
1177 goto send_data;
1178 } else
1179 return -1;
1180 }
1181 cmd->tx_size = 0;
1182
1183 return 0;
1184}
1185
1186int iscsit_fe_sendpage_sg(
1187 struct iscsi_cmd *cmd,
1188 struct iscsi_conn *conn)
1189{
1190 struct scatterlist *sg = cmd->first_data_sg;
1191 struct kvec iov;
1192 u32 tx_hdr_size, data_len;
1193 u32 offset = cmd->first_data_sg_off;
1194 int tx_sent, iov_off;
1195
1196send_hdr:
1197 tx_hdr_size = ISCSI_HDR_LEN;
1198 if (conn->conn_ops->HeaderDigest)
1199 tx_hdr_size += ISCSI_CRC_LEN;
1200
1201 iov.iov_base = cmd->pdu;
1202 iov.iov_len = tx_hdr_size;
1203
1204 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1205 if (tx_hdr_size != tx_sent) {
1206 if (tx_sent == -EAGAIN) {
1207 pr_err("tx_data() returned -EAGAIN\n");
1208 goto send_hdr;
1209 }
1210 return -1;
1211 }
1212
1213 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1214
1215
1216
1217
1218 if (conn->conn_ops->DataDigest) {
1219 data_len -= ISCSI_CRC_LEN;
1220 if (cmd->padding)
1221 iov_off = (cmd->iov_data_count - 2);
1222 else
1223 iov_off = (cmd->iov_data_count - 1);
1224 } else {
1225 iov_off = (cmd->iov_data_count - 1);
1226 }
1227
1228
1229
1230 while (data_len) {
1231 u32 space = (sg->length - offset);
1232 u32 sub_len = min_t(u32, data_len, space);
1233send_pg:
1234 tx_sent = conn->sock->ops->sendpage(conn->sock,
1235 sg_page(sg), sg->offset + offset, sub_len, 0);
1236 if (tx_sent != sub_len) {
1237 if (tx_sent == -EAGAIN) {
1238 pr_err("tcp_sendpage() returned"
1239 " -EAGAIN\n");
1240 goto send_pg;
1241 }
1242
1243 pr_err("tcp_sendpage() failure: %d\n",
1244 tx_sent);
1245 return -1;
1246 }
1247
1248 data_len -= sub_len;
1249 offset = 0;
1250 sg = sg_next(sg);
1251 }
1252
1253send_padding:
1254 if (cmd->padding) {
1255 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1256
1257 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1258 if (cmd->padding != tx_sent) {
1259 if (tx_sent == -EAGAIN) {
1260 pr_err("tx_data() returned -EAGAIN\n");
1261 goto send_padding;
1262 }
1263 return -1;
1264 }
1265 }
1266
1267send_datacrc:
1268 if (conn->conn_ops->DataDigest) {
1269 struct kvec *iov_d = &cmd->iov_data[iov_off];
1270
1271 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1272 if (ISCSI_CRC_LEN != tx_sent) {
1273 if (tx_sent == -EAGAIN) {
1274 pr_err("tx_data() returned -EAGAIN\n");
1275 goto send_datacrc;
1276 }
1277 return -1;
1278 }
1279 }
1280
1281 return 0;
1282}
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1293{
1294 struct iscsi_login_rsp *hdr;
1295 struct iscsi_login *login = conn->conn_login;
1296
1297 login->login_failed = 1;
1298 iscsit_collect_login_stats(conn, status_class, status_detail);
1299
1300 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1301
1302 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1303 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1304 hdr->status_class = status_class;
1305 hdr->status_detail = status_detail;
1306 hdr->itt = conn->login_itt;
1307
1308 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1309}
1310
1311void iscsit_print_session_params(struct iscsi_session *sess)
1312{
1313 struct iscsi_conn *conn;
1314
1315 pr_debug("-----------------------------[Session Params for"
1316 " SID: %u]-----------------------------\n", sess->sid);
1317 spin_lock_bh(&sess->conn_lock);
1318 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1319 iscsi_dump_conn_ops(conn->conn_ops);
1320 spin_unlock_bh(&sess->conn_lock);
1321
1322 iscsi_dump_sess_ops(sess->sess_ops);
1323}
1324
1325static int iscsit_do_rx_data(
1326 struct iscsi_conn *conn,
1327 struct iscsi_data_count *count)
1328{
1329 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1330 struct kvec *iov_p;
1331 struct msghdr msg;
1332
1333 if (!conn || !conn->sock || !conn->conn_ops)
1334 return -1;
1335
1336 memset(&msg, 0, sizeof(struct msghdr));
1337
1338 iov_p = count->iov;
1339 iov_len = count->iov_count;
1340
1341 while (total_rx < data) {
1342 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1343 (data - total_rx), MSG_WAITALL);
1344 if (rx_loop <= 0) {
1345 pr_debug("rx_loop: %d total_rx: %d\n",
1346 rx_loop, total_rx);
1347 return rx_loop;
1348 }
1349 total_rx += rx_loop;
1350 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1351 rx_loop, total_rx, data);
1352 }
1353
1354 return total_rx;
1355}
1356
1357static int iscsit_do_tx_data(
1358 struct iscsi_conn *conn,
1359 struct iscsi_data_count *count)
1360{
1361 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1362 struct kvec *iov_p;
1363 struct msghdr msg;
1364
1365 if (!conn || !conn->sock || !conn->conn_ops)
1366 return -1;
1367
1368 if (data <= 0) {
1369 pr_err("Data length is: %d\n", data);
1370 return -1;
1371 }
1372
1373 memset(&msg, 0, sizeof(struct msghdr));
1374
1375 iov_p = count->iov;
1376 iov_len = count->iov_count;
1377
1378 while (total_tx < data) {
1379 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1380 (data - total_tx));
1381 if (tx_loop <= 0) {
1382 pr_debug("tx_loop: %d total_tx %d\n",
1383 tx_loop, total_tx);
1384 return tx_loop;
1385 }
1386 total_tx += tx_loop;
1387 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1388 tx_loop, total_tx, data);
1389 }
1390
1391 return total_tx;
1392}
1393
1394int rx_data(
1395 struct iscsi_conn *conn,
1396 struct kvec *iov,
1397 int iov_count,
1398 int data)
1399{
1400 struct iscsi_data_count c;
1401
1402 if (!conn || !conn->sock || !conn->conn_ops)
1403 return -1;
1404
1405 memset(&c, 0, sizeof(struct iscsi_data_count));
1406 c.iov = iov;
1407 c.iov_count = iov_count;
1408 c.data_length = data;
1409 c.type = ISCSI_RX_DATA;
1410
1411 return iscsit_do_rx_data(conn, &c);
1412}
1413
1414int tx_data(
1415 struct iscsi_conn *conn,
1416 struct kvec *iov,
1417 int iov_count,
1418 int data)
1419{
1420 struct iscsi_data_count c;
1421
1422 if (!conn || !conn->sock || !conn->conn_ops)
1423 return -1;
1424
1425 memset(&c, 0, sizeof(struct iscsi_data_count));
1426 c.iov = iov;
1427 c.iov_count = iov_count;
1428 c.data_length = data;
1429 c.type = ISCSI_TX_DATA;
1430
1431 return iscsit_do_tx_data(conn, &c);
1432}
1433
1434void iscsit_collect_login_stats(
1435 struct iscsi_conn *conn,
1436 u8 status_class,
1437 u8 status_detail)
1438{
1439 struct iscsi_param *intrname = NULL;
1440 struct iscsi_tiqn *tiqn;
1441 struct iscsi_login_stats *ls;
1442
1443 tiqn = iscsit_snmp_get_tiqn(conn);
1444 if (!tiqn)
1445 return;
1446
1447 ls = &tiqn->login_stats;
1448
1449 spin_lock(&ls->lock);
1450 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1451 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1452
1453 spin_unlock(&ls->lock);
1454 return;
1455 }
1456
1457 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1458 ls->accepts++;
1459 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1460 ls->redirects++;
1461 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1462 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1463 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1464 ls->authenticate_fails++;
1465 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1466 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1467 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1468 ls->authorize_fails++;
1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1470 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1471 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1472 ls->negotiate_fails++;
1473 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1474 } else {
1475 ls->other_fails++;
1476 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1477 }
1478
1479
1480 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1481 if (conn->param_list)
1482 intrname = iscsi_find_param_from_key(INITIATORNAME,
1483 conn->param_list);
1484 strcpy(ls->last_intr_fail_name,
1485 (intrname ? intrname->value : "Unknown"));
1486
1487 ls->last_intr_fail_ip_family = conn->login_family;
1488
1489 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1490 "%s", conn->login_ip);
1491 ls->last_fail_time = get_jiffies_64();
1492 }
1493
1494 spin_unlock(&ls->lock);
1495}
1496
1497struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1498{
1499 struct iscsi_portal_group *tpg;
1500
1501 if (!conn || !conn->sess)
1502 return NULL;
1503
1504 tpg = conn->sess->tpg;
1505 if (!tpg)
1506 return NULL;
1507
1508 if (!tpg->tpg_tiqn)
1509 return NULL;
1510
1511 return tpg->tpg_tiqn;
1512}
1513
