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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_util.c
blob89183b3b178ffc950f9521635eef37a3d4325ad9
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains the iSCSI Target specific utility functions.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/list.h>
12 #include <linux/sched/signal.h>
13 #include <net/ipv6.h> /* ipv6_addr_equal() */
14 #include <scsi/scsi_tcq.h>
15 #include <scsi/iscsi_proto.h>
16 #include <target/target_core_base.h>
17 #include <target/target_core_fabric.h>
18 #include <target/iscsi/iscsi_transport.h>
19
20 #include <target/iscsi/iscsi_target_core.h>
21 #include "iscsi_target_parameters.h"
22 #include "iscsi_target_seq_pdu_list.h"
23 #include "iscsi_target_datain_values.h"
24 #include "iscsi_target_erl0.h"
25 #include "iscsi_target_erl1.h"
26 #include "iscsi_target_erl2.h"
27 #include "iscsi_target_tpg.h"
28 #include "iscsi_target_util.h"
29 #include "iscsi_target.h"
30
31 #define PRINT_BUFF(buff, len) \
32 { \
33 int zzz; \
34 \
35 pr_debug("%d:\n", __LINE__); \
36 for (zzz = 0; zzz < len; zzz++) { \
37 if (zzz % 16 == 0) { \
38 if (zzz) \
39 pr_debug("\n"); \
40 pr_debug("%4i: ", zzz); \
41 } \
42 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
43 } \
44 if ((len + 1) % 16) \
45 pr_debug("\n"); \
46 }
47
48 extern struct list_head g_tiqn_list;
49 extern spinlock_t tiqn_lock;
50
51 int iscsit_add_r2t_to_list(
52 struct iscsi_cmd *cmd,
53 u32 offset,
54 u32 xfer_len,
55 int recovery,
56 u32 r2t_sn)
57 {
58 struct iscsi_r2t *r2t;
59
60 lockdep_assert_held(&cmd->r2t_lock);
61
62 WARN_ON_ONCE((s32)xfer_len < 0);
63
64 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
65 if (!r2t) {
66 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
67 return -1;
68 }
69 INIT_LIST_HEAD(&r2t->r2t_list);
70
71 r2t->recovery_r2t = recovery;
72 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
73 r2t->offset = offset;
74 r2t->xfer_len = xfer_len;
75 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
76 spin_unlock_bh(&cmd->r2t_lock);
77
78 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
79
80 spin_lock_bh(&cmd->r2t_lock);
81 return 0;
82 }
83
84 struct iscsi_r2t *iscsit_get_r2t_for_eos(
85 struct iscsi_cmd *cmd,
86 u32 offset,
87 u32 length)
88 {
89 struct iscsi_r2t *r2t;
90
91 spin_lock_bh(&cmd->r2t_lock);
92 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
93 if ((r2t->offset <= offset) &&
94 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
95 spin_unlock_bh(&cmd->r2t_lock);
96 return r2t;
97 }
98 }
99 spin_unlock_bh(&cmd->r2t_lock);
100
101 pr_err("Unable to locate R2T for Offset: %u, Length:"
102 " %u\n", offset, length);
103 return NULL;
104 }
105
106 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
107 {
108 struct iscsi_r2t *r2t;
109
110 spin_lock_bh(&cmd->r2t_lock);
111 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
112 if (!r2t->sent_r2t) {
113 spin_unlock_bh(&cmd->r2t_lock);
114 return r2t;
115 }
116 }
117 spin_unlock_bh(&cmd->r2t_lock);
118
119 pr_err("Unable to locate next R2T to send for ITT:"
120 " 0x%08x.\n", cmd->init_task_tag);
121 return NULL;
122 }
123
124 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
125 {
126 lockdep_assert_held(&cmd->r2t_lock);
127
128 list_del(&r2t->r2t_list);
129 kmem_cache_free(lio_r2t_cache, r2t);
130 }
131
132 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
133 {
134 struct iscsi_r2t *r2t, *r2t_tmp;
135
136 spin_lock_bh(&cmd->r2t_lock);
137 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
138 iscsit_free_r2t(r2t, cmd);
139 spin_unlock_bh(&cmd->r2t_lock);
140 }
141
142 static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
143 {
144 int tag = -1;
145 DEFINE_SBQ_WAIT(wait);
146 struct sbq_wait_state *ws;
147 struct sbitmap_queue *sbq;
148
149 if (state == TASK_RUNNING)
150 return tag;
151
152 sbq = &se_sess->sess_tag_pool;
153 ws = &sbq->ws[0];
154 for (;;) {
155 sbitmap_prepare_to_wait(sbq, ws, &wait, state);
156 if (signal_pending_state(state, current))
157 break;
158 tag = sbitmap_queue_get(sbq, cpup);
159 if (tag >= 0)
160 break;
161 schedule();
162 }
163
164 sbitmap_finish_wait(sbq, ws, &wait);
165 return tag;
166 }
167
168 /*
169 * May be called from software interrupt (timer) context for allocating
170 * iSCSI NopINs.
171 */
172 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
173 {
174 struct iscsi_cmd *cmd;
175 struct se_session *se_sess = conn->sess->se_sess;
176 int size, tag, cpu;
177
178 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
179 if (tag < 0)
180 tag = iscsit_wait_for_tag(se_sess, state, &cpu);
181 if (tag < 0)
182 return NULL;
183
184 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
185 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
186 memset(cmd, 0, size);
187
188 cmd->se_cmd.map_tag = tag;
189 cmd->se_cmd.map_cpu = cpu;
190 cmd->conn = conn;
191 cmd->data_direction = DMA_NONE;
192 INIT_LIST_HEAD(&cmd->i_conn_node);
193 INIT_LIST_HEAD(&cmd->datain_list);
194 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
195 spin_lock_init(&cmd->datain_lock);
196 spin_lock_init(&cmd->dataout_timeout_lock);
197 spin_lock_init(&cmd->istate_lock);
198 spin_lock_init(&cmd->error_lock);
199 spin_lock_init(&cmd->r2t_lock);
200 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
201
202 return cmd;
203 }
204 EXPORT_SYMBOL(iscsit_allocate_cmd);
205
206 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
207 struct iscsi_cmd *cmd,
208 u32 seq_send_order)
209 {
210 u32 i;
211
212 for (i = 0; i < cmd->seq_count; i++)
213 if (cmd->seq_list[i].seq_send_order == seq_send_order)
214 return &cmd->seq_list[i];
215
216 return NULL;
217 }
218
219 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
220 {
221 u32 i;
222
223 if (!cmd->seq_list) {
224 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
225 return NULL;
226 }
227
228 for (i = 0; i < cmd->seq_count; i++) {
229 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
230 continue;
231 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
232 cmd->seq_send_order++;
233 return &cmd->seq_list[i];
234 }
235 }
236
237 return NULL;
238 }
239
240 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
241 struct iscsi_cmd *cmd,
242 u32 r2t_sn)
243 {
244 struct iscsi_r2t *r2t;
245
246 spin_lock_bh(&cmd->r2t_lock);
247 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
248 if (r2t->r2t_sn == r2t_sn) {
249 spin_unlock_bh(&cmd->r2t_lock);
250 return r2t;
251 }
252 }
253 spin_unlock_bh(&cmd->r2t_lock);
254
255 return NULL;
256 }
257
258 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
259 {
260 u32 max_cmdsn;
261 int ret;
262
263 /*
264 * This is the proper method of checking received CmdSN against
265 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
266 * or order CmdSNs due to multiple connection sessions and/or
267 * CRC failures.
268 */
269 max_cmdsn = atomic_read(&sess->max_cmd_sn);
270 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
271 pr_err("Received CmdSN: 0x%08x is greater than"
272 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
273 ret = CMDSN_MAXCMDSN_OVERRUN;
274
275 } else if (cmdsn == sess->exp_cmd_sn) {
276 sess->exp_cmd_sn++;
277 pr_debug("Received CmdSN matches ExpCmdSN,"
278 " incremented ExpCmdSN to: 0x%08x\n",
279 sess->exp_cmd_sn);
280 ret = CMDSN_NORMAL_OPERATION;
281
282 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
283 pr_debug("Received CmdSN: 0x%08x is greater"
284 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
285 cmdsn, sess->exp_cmd_sn);
286 ret = CMDSN_HIGHER_THAN_EXP;
287
288 } else {
289 pr_err("Received CmdSN: 0x%08x is less than"
290 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
291 sess->exp_cmd_sn);
292 ret = CMDSN_LOWER_THAN_EXP;
293 }
294
295 return ret;
296 }
297
298 /*
299 * Commands may be received out of order if MC/S is in use.
300 * Ensure they are executed in CmdSN order.
301 */
302 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
303 unsigned char *buf, __be32 cmdsn)
304 {
305 int ret, cmdsn_ret;
306 bool reject = false;
307 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
308
309 mutex_lock(&conn->sess->cmdsn_mutex);
310
311 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
312 switch (cmdsn_ret) {
313 case CMDSN_NORMAL_OPERATION:
314 ret = iscsit_execute_cmd(cmd, 0);
315 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
316 iscsit_execute_ooo_cmdsns(conn->sess);
317 else if (ret < 0) {
318 reject = true;
319 ret = CMDSN_ERROR_CANNOT_RECOVER;
320 }
321 break;
322 case CMDSN_HIGHER_THAN_EXP:
323 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
324 if (ret < 0) {
325 reject = true;
326 ret = CMDSN_ERROR_CANNOT_RECOVER;
327 break;
328 }
329 ret = CMDSN_HIGHER_THAN_EXP;
330 break;
331 case CMDSN_LOWER_THAN_EXP:
332 case CMDSN_MAXCMDSN_OVERRUN:
333 default:
334 cmd->i_state = ISTATE_REMOVE;
335 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
336 /*
337 * Existing callers for iscsit_sequence_cmd() will silently
338 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
339 * return for CMDSN_MAXCMDSN_OVERRUN as well..
340 */
341 ret = CMDSN_LOWER_THAN_EXP;
342 break;
343 }
344 mutex_unlock(&conn->sess->cmdsn_mutex);
345
346 if (reject)
347 iscsit_reject_cmd(cmd, reason, buf);
348
349 return ret;
350 }
351 EXPORT_SYMBOL(iscsit_sequence_cmd);
352
353 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
354 {
355 struct iscsi_conn *conn = cmd->conn;
356 struct se_cmd *se_cmd = &cmd->se_cmd;
357 struct iscsi_data *hdr = (struct iscsi_data *) buf;
358 u32 payload_length = ntoh24(hdr->dlength);
359
360 if (conn->sess->sess_ops->InitialR2T) {
361 pr_err("Received unexpected unsolicited data"
362 " while InitialR2T=Yes, protocol error.\n");
363 transport_send_check_condition_and_sense(se_cmd,
364 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
365 return -1;
366 }
367
368 if ((cmd->first_burst_len + payload_length) >
369 conn->sess->sess_ops->FirstBurstLength) {
370 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
371 " for this Unsolicited DataOut Burst.\n",
372 (cmd->first_burst_len + payload_length),
373 conn->sess->sess_ops->FirstBurstLength);
374 transport_send_check_condition_and_sense(se_cmd,
375 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
376 return -1;
377 }
378
379 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
380 return 0;
381
382 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
383 ((cmd->first_burst_len + payload_length) !=
384 conn->sess->sess_ops->FirstBurstLength)) {
385 pr_err("Unsolicited non-immediate data received %u"
386 " does not equal FirstBurstLength: %u, and does"
387 " not equal ExpXferLen %u.\n",
388 (cmd->first_burst_len + payload_length),
389 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
390 transport_send_check_condition_and_sense(se_cmd,
391 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
392 return -1;
393 }
394 return 0;
395 }
396
397 struct iscsi_cmd *iscsit_find_cmd_from_itt(
398 struct iscsi_conn *conn,
399 itt_t init_task_tag)
400 {
401 struct iscsi_cmd *cmd;
402
403 spin_lock_bh(&conn->cmd_lock);
404 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
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 init_task_tag, conn->cid);
414 return NULL;
415 }
416 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
417
418 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
419 struct iscsi_conn *conn,
420 itt_t init_task_tag,
421 u32 length)
422 {
423 struct iscsi_cmd *cmd;
424
425 spin_lock_bh(&conn->cmd_lock);
426 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
427 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
428 continue;
429 if (cmd->init_task_tag == init_task_tag) {
430 spin_unlock_bh(&conn->cmd_lock);
431 return cmd;
432 }
433 }
434 spin_unlock_bh(&conn->cmd_lock);
435
436 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
437 " dumping payload\n", init_task_tag, conn->cid);
438 if (length)
439 iscsit_dump_data_payload(conn, length, 1);
440
441 return NULL;
442 }
443 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
444
445 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
446 struct iscsi_conn *conn,
447 u32 targ_xfer_tag)
448 {
449 struct iscsi_cmd *cmd = NULL;
450
451 spin_lock_bh(&conn->cmd_lock);
452 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
453 if (cmd->targ_xfer_tag == targ_xfer_tag) {
454 spin_unlock_bh(&conn->cmd_lock);
455 return cmd;
456 }
457 }
458 spin_unlock_bh(&conn->cmd_lock);
459
460 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
461 targ_xfer_tag, conn->cid);
462 return NULL;
463 }
464
465 int iscsit_find_cmd_for_recovery(
466 struct iscsi_session *sess,
467 struct iscsi_cmd **cmd_ptr,
468 struct iscsi_conn_recovery **cr_ptr,
469 itt_t init_task_tag)
470 {
471 struct iscsi_cmd *cmd = NULL;
472 struct iscsi_conn_recovery *cr;
473 /*
474 * Scan through the inactive connection recovery list's command list.
475 * If init_task_tag matches the command is still alligent.
476 */
477 spin_lock(&sess->cr_i_lock);
478 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
479 spin_lock(&cr->conn_recovery_cmd_lock);
480 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
481 if (cmd->init_task_tag == init_task_tag) {
482 spin_unlock(&cr->conn_recovery_cmd_lock);
483 spin_unlock(&sess->cr_i_lock);
484
485 *cr_ptr = cr;
486 *cmd_ptr = cmd;
487 return -2;
488 }
489 }
490 spin_unlock(&cr->conn_recovery_cmd_lock);
491 }
492 spin_unlock(&sess->cr_i_lock);
493 /*
494 * Scan through the active connection recovery list's command list.
495 * If init_task_tag matches the command is ready to be reassigned.
496 */
497 spin_lock(&sess->cr_a_lock);
498 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
499 spin_lock(&cr->conn_recovery_cmd_lock);
500 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
501 if (cmd->init_task_tag == init_task_tag) {
502 spin_unlock(&cr->conn_recovery_cmd_lock);
503 spin_unlock(&sess->cr_a_lock);
504
505 *cr_ptr = cr;
506 *cmd_ptr = cmd;
507 return 0;
508 }
509 }
510 spin_unlock(&cr->conn_recovery_cmd_lock);
511 }
512 spin_unlock(&sess->cr_a_lock);
513
514 return -1;
515 }
516
517 void iscsit_add_cmd_to_immediate_queue(
518 struct iscsi_cmd *cmd,
519 struct iscsi_conn *conn,
520 u8 state)
521 {
522 struct iscsi_queue_req *qr;
523
524 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
525 if (!qr) {
526 pr_err("Unable to allocate memory for"
527 " struct iscsi_queue_req\n");
528 return;
529 }
530 INIT_LIST_HEAD(&qr->qr_list);
531 qr->cmd = cmd;
532 qr->state = state;
533
534 spin_lock_bh(&conn->immed_queue_lock);
535 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
536 atomic_inc(&cmd->immed_queue_count);
537 atomic_set(&conn->check_immediate_queue, 1);
538 spin_unlock_bh(&conn->immed_queue_lock);
539
540 wake_up(&conn->queues_wq);
541 }
542 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
543
544 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
545 {
546 struct iscsi_queue_req *qr;
547
548 spin_lock_bh(&conn->immed_queue_lock);
549 if (list_empty(&conn->immed_queue_list)) {
550 spin_unlock_bh(&conn->immed_queue_lock);
551 return NULL;
552 }
553 qr = list_first_entry(&conn->immed_queue_list,
554 struct iscsi_queue_req, qr_list);
555
556 list_del(&qr->qr_list);
557 if (qr->cmd)
558 atomic_dec(&qr->cmd->immed_queue_count);
559 spin_unlock_bh(&conn->immed_queue_lock);
560
561 return qr;
562 }
563
564 static void iscsit_remove_cmd_from_immediate_queue(
565 struct iscsi_cmd *cmd,
566 struct iscsi_conn *conn)
567 {
568 struct iscsi_queue_req *qr, *qr_tmp;
569
570 spin_lock_bh(&conn->immed_queue_lock);
571 if (!atomic_read(&cmd->immed_queue_count)) {
572 spin_unlock_bh(&conn->immed_queue_lock);
573 return;
574 }
575
576 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
577 if (qr->cmd != cmd)
578 continue;
579
580 atomic_dec(&qr->cmd->immed_queue_count);
581 list_del(&qr->qr_list);
582 kmem_cache_free(lio_qr_cache, qr);
583 }
584 spin_unlock_bh(&conn->immed_queue_lock);
585
586 if (atomic_read(&cmd->immed_queue_count)) {
587 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
588 cmd->init_task_tag,
589 atomic_read(&cmd->immed_queue_count));
590 }
591 }
592
593 int iscsit_add_cmd_to_response_queue(
594 struct iscsi_cmd *cmd,
595 struct iscsi_conn *conn,
596 u8 state)
597 {
598 struct iscsi_queue_req *qr;
599
600 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
601 if (!qr) {
602 pr_err("Unable to allocate memory for"
603 " struct iscsi_queue_req\n");
604 return -ENOMEM;
605 }
606 INIT_LIST_HEAD(&qr->qr_list);
607 qr->cmd = cmd;
608 qr->state = state;
609
610 spin_lock_bh(&conn->response_queue_lock);
611 list_add_tail(&qr->qr_list, &conn->response_queue_list);
612 atomic_inc(&cmd->response_queue_count);
613 spin_unlock_bh(&conn->response_queue_lock);
614
615 wake_up(&conn->queues_wq);
616 return 0;
617 }
618
619 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
620 {
621 struct iscsi_queue_req *qr;
622
623 spin_lock_bh(&conn->response_queue_lock);
624 if (list_empty(&conn->response_queue_list)) {
625 spin_unlock_bh(&conn->response_queue_lock);
626 return NULL;
627 }
628
629 qr = list_first_entry(&conn->response_queue_list,
630 struct iscsi_queue_req, qr_list);
631
632 list_del(&qr->qr_list);
633 if (qr->cmd)
634 atomic_dec(&qr->cmd->response_queue_count);
635 spin_unlock_bh(&conn->response_queue_lock);
636
637 return qr;
638 }
639
640 static void iscsit_remove_cmd_from_response_queue(
641 struct iscsi_cmd *cmd,
642 struct iscsi_conn *conn)
643 {
644 struct iscsi_queue_req *qr, *qr_tmp;
645
646 spin_lock_bh(&conn->response_queue_lock);
647 if (!atomic_read(&cmd->response_queue_count)) {
648 spin_unlock_bh(&conn->response_queue_lock);
649 return;
650 }
651
652 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
653 qr_list) {
654 if (qr->cmd != cmd)
655 continue;
656
657 atomic_dec(&qr->cmd->response_queue_count);
658 list_del(&qr->qr_list);
659 kmem_cache_free(lio_qr_cache, qr);
660 }
661 spin_unlock_bh(&conn->response_queue_lock);
662
663 if (atomic_read(&cmd->response_queue_count)) {
664 pr_err("ITT: 0x%08x response_queue_count: %d\n",
665 cmd->init_task_tag,
666 atomic_read(&cmd->response_queue_count));
667 }
668 }
669
670 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
671 {
672 bool empty;
673
674 spin_lock_bh(&conn->immed_queue_lock);
675 empty = list_empty(&conn->immed_queue_list);
676 spin_unlock_bh(&conn->immed_queue_lock);
677
678 if (!empty)
679 return empty;
680
681 spin_lock_bh(&conn->response_queue_lock);
682 empty = list_empty(&conn->response_queue_list);
683 spin_unlock_bh(&conn->response_queue_lock);
684
685 return empty;
686 }
687
688 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
689 {
690 struct iscsi_queue_req *qr, *qr_tmp;
691
692 spin_lock_bh(&conn->immed_queue_lock);
693 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
694 list_del(&qr->qr_list);
695 if (qr->cmd)
696 atomic_dec(&qr->cmd->immed_queue_count);
697
698 kmem_cache_free(lio_qr_cache, qr);
699 }
700 spin_unlock_bh(&conn->immed_queue_lock);
701
702 spin_lock_bh(&conn->response_queue_lock);
703 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
704 qr_list) {
705 list_del(&qr->qr_list);
706 if (qr->cmd)
707 atomic_dec(&qr->cmd->response_queue_count);
708
709 kmem_cache_free(lio_qr_cache, qr);
710 }
711 spin_unlock_bh(&conn->response_queue_lock);
712 }
713
714 void iscsit_release_cmd(struct iscsi_cmd *cmd)
715 {
716 struct iscsi_session *sess;
717 struct se_cmd *se_cmd = &cmd->se_cmd;
718
719 WARN_ON(!list_empty(&cmd->i_conn_node));
720
721 if (cmd->conn)
722 sess = cmd->conn->sess;
723 else
724 sess = cmd->sess;
725
726 BUG_ON(!sess || !sess->se_sess);
727
728 kfree(cmd->buf_ptr);
729 kfree(cmd->pdu_list);
730 kfree(cmd->seq_list);
731 kfree(cmd->tmr_req);
732 kfree(cmd->overflow_buf);
733 kfree(cmd->iov_data);
734 kfree(cmd->text_in_ptr);
735
736 target_free_tag(sess->se_sess, se_cmd);
737 }
738 EXPORT_SYMBOL(iscsit_release_cmd);
739
740 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
741 {
742 struct iscsi_conn *conn = cmd->conn;
743
744 WARN_ON(!list_empty(&cmd->i_conn_node));
745
746 if (cmd->data_direction == DMA_TO_DEVICE) {
747 iscsit_stop_dataout_timer(cmd);
748 iscsit_free_r2ts_from_list(cmd);
749 }
750 if (cmd->data_direction == DMA_FROM_DEVICE)
751 iscsit_free_all_datain_reqs(cmd);
752
753 if (conn && check_queues) {
754 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
755 iscsit_remove_cmd_from_response_queue(cmd, conn);
756 }
757
758 if (conn && conn->conn_transport->iscsit_unmap_cmd)
759 conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
760 }
761
762 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
763 {
764 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
765 int rc;
766
767 WARN_ON(!list_empty(&cmd->i_conn_node));
768
769 __iscsit_free_cmd(cmd, shutdown);
770 if (se_cmd) {
771 rc = transport_generic_free_cmd(se_cmd, shutdown);
772 if (!rc && shutdown && se_cmd->se_sess) {
773 __iscsit_free_cmd(cmd, shutdown);
774 target_put_sess_cmd(se_cmd);
775 }
776 } else {
777 iscsit_release_cmd(cmd);
778 }
779 }
780 EXPORT_SYMBOL(iscsit_free_cmd);
781
782 int iscsit_check_session_usage_count(struct iscsi_session *sess)
783 {
784 spin_lock_bh(&sess->session_usage_lock);
785 if (sess->session_usage_count != 0) {
786 sess->session_waiting_on_uc = 1;
787 spin_unlock_bh(&sess->session_usage_lock);
788 if (in_interrupt())
789 return 2;
790
791 wait_for_completion(&sess->session_waiting_on_uc_comp);
792 return 1;
793 }
794 spin_unlock_bh(&sess->session_usage_lock);
795
796 return 0;
797 }
798
799 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
800 {
801 spin_lock_bh(&sess->session_usage_lock);
802 sess->session_usage_count--;
803
804 if (!sess->session_usage_count && sess->session_waiting_on_uc)
805 complete(&sess->session_waiting_on_uc_comp);
806
807 spin_unlock_bh(&sess->session_usage_lock);
808 }
809
810 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
811 {
812 spin_lock_bh(&sess->session_usage_lock);
813 sess->session_usage_count++;
814 spin_unlock_bh(&sess->session_usage_lock);
815 }
816
817 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
818 {
819 struct iscsi_conn *conn;
820
821 spin_lock_bh(&sess->conn_lock);
822 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
823 if ((conn->cid == cid) &&
824 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
825 iscsit_inc_conn_usage_count(conn);
826 spin_unlock_bh(&sess->conn_lock);
827 return conn;
828 }
829 }
830 spin_unlock_bh(&sess->conn_lock);
831
832 return NULL;
833 }
834
835 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
836 {
837 struct iscsi_conn *conn;
838
839 spin_lock_bh(&sess->conn_lock);
840 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
841 if (conn->cid == cid) {
842 iscsit_inc_conn_usage_count(conn);
843 spin_lock(&conn->state_lock);
844 atomic_set(&conn->connection_wait_rcfr, 1);
845 spin_unlock(&conn->state_lock);
846 spin_unlock_bh(&sess->conn_lock);
847 return conn;
848 }
849 }
850 spin_unlock_bh(&sess->conn_lock);
851
852 return NULL;
853 }
854
855 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
856 {
857 spin_lock_bh(&conn->conn_usage_lock);
858 if (conn->conn_usage_count != 0) {
859 conn->conn_waiting_on_uc = 1;
860 spin_unlock_bh(&conn->conn_usage_lock);
861
862 wait_for_completion(&conn->conn_waiting_on_uc_comp);
863 return;
864 }
865 spin_unlock_bh(&conn->conn_usage_lock);
866 }
867
868 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
869 {
870 spin_lock_bh(&conn->conn_usage_lock);
871 conn->conn_usage_count--;
872
873 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
874 complete(&conn->conn_waiting_on_uc_comp);
875
876 spin_unlock_bh(&conn->conn_usage_lock);
877 }
878
879 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
880 {
881 spin_lock_bh(&conn->conn_usage_lock);
882 conn->conn_usage_count++;
883 spin_unlock_bh(&conn->conn_usage_lock);
884 }
885
886 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
887 {
888 u8 state;
889 struct iscsi_cmd *cmd;
890
891 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
892 if (!cmd)
893 return -1;
894
895 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
896 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
897 ISTATE_SEND_NOPIN_NO_RESPONSE;
898 cmd->init_task_tag = RESERVED_ITT;
899 cmd->targ_xfer_tag = (want_response) ?
900 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
901 spin_lock_bh(&conn->cmd_lock);
902 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
903 spin_unlock_bh(&conn->cmd_lock);
904
905 if (want_response)
906 iscsit_start_nopin_response_timer(conn);
907 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
908
909 return 0;
910 }
911
912 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
913 {
914 struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
915 struct iscsi_session *sess = conn->sess;
916
917 iscsit_inc_conn_usage_count(conn);
918
919 spin_lock_bh(&conn->nopin_timer_lock);
920 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
921 spin_unlock_bh(&conn->nopin_timer_lock);
922 iscsit_dec_conn_usage_count(conn);
923 return;
924 }
925
926 pr_err("Did not receive response to NOPIN on CID: %hu, failing"
927 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
928 conn->cid, sess->sess_ops->InitiatorName, sess->isid,
929 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
930 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
931 spin_unlock_bh(&conn->nopin_timer_lock);
932
933 iscsit_fill_cxn_timeout_err_stats(sess);
934 iscsit_cause_connection_reinstatement(conn, 0);
935 iscsit_dec_conn_usage_count(conn);
936 }
937
938 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
939 {
940 struct iscsi_session *sess = conn->sess;
941 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
942
943 spin_lock_bh(&conn->nopin_timer_lock);
944 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
945 spin_unlock_bh(&conn->nopin_timer_lock);
946 return;
947 }
948
949 mod_timer(&conn->nopin_response_timer,
950 (get_jiffies_64() + na->nopin_response_timeout * HZ));
951 spin_unlock_bh(&conn->nopin_timer_lock);
952 }
953
954 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
955 {
956 struct iscsi_session *sess = conn->sess;
957 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
958
959 spin_lock_bh(&conn->nopin_timer_lock);
960 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
961 spin_unlock_bh(&conn->nopin_timer_lock);
962 return;
963 }
964
965 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
966 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
967 mod_timer(&conn->nopin_response_timer,
968 jiffies + na->nopin_response_timeout * HZ);
969
970 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
971 " seconds\n", conn->cid, na->nopin_response_timeout);
972 spin_unlock_bh(&conn->nopin_timer_lock);
973 }
974
975 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
976 {
977 spin_lock_bh(&conn->nopin_timer_lock);
978 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
979 spin_unlock_bh(&conn->nopin_timer_lock);
980 return;
981 }
982 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
983 spin_unlock_bh(&conn->nopin_timer_lock);
984
985 del_timer_sync(&conn->nopin_response_timer);
986
987 spin_lock_bh(&conn->nopin_timer_lock);
988 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
989 spin_unlock_bh(&conn->nopin_timer_lock);
990 }
991
992 void iscsit_handle_nopin_timeout(struct timer_list *t)
993 {
994 struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
995
996 iscsit_inc_conn_usage_count(conn);
997
998 spin_lock_bh(&conn->nopin_timer_lock);
999 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1000 spin_unlock_bh(&conn->nopin_timer_lock);
1001 iscsit_dec_conn_usage_count(conn);
1002 return;
1003 }
1004 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1005 spin_unlock_bh(&conn->nopin_timer_lock);
1006
1007 iscsit_add_nopin(conn, 1);
1008 iscsit_dec_conn_usage_count(conn);
1009 }
1010
1011 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1012 {
1013 struct iscsi_session *sess = conn->sess;
1014 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1015
1016 lockdep_assert_held(&conn->nopin_timer_lock);
1017
1018 /*
1019 * NOPIN timeout is disabled.
1020 */
1021 if (!na->nopin_timeout)
1022 return;
1023
1024 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1025 return;
1026
1027 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1028 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1029 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1030
1031 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1032 " interval\n", conn->cid, na->nopin_timeout);
1033 }
1034
1035 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1036 {
1037 spin_lock_bh(&conn->nopin_timer_lock);
1038 __iscsit_start_nopin_timer(conn);
1039 spin_unlock_bh(&conn->nopin_timer_lock);
1040 }
1041
1042 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1043 {
1044 spin_lock_bh(&conn->nopin_timer_lock);
1045 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1047 return;
1048 }
1049 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1050 spin_unlock_bh(&conn->nopin_timer_lock);
1051
1052 del_timer_sync(&conn->nopin_timer);
1053
1054 spin_lock_bh(&conn->nopin_timer_lock);
1055 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1056 spin_unlock_bh(&conn->nopin_timer_lock);
1057 }
1058
1059 int iscsit_send_tx_data(
1060 struct iscsi_cmd *cmd,
1061 struct iscsi_conn *conn,
1062 int use_misc)
1063 {
1064 int tx_sent, tx_size;
1065 u32 iov_count;
1066 struct kvec *iov;
1067
1068 send_data:
1069 tx_size = cmd->tx_size;
1070
1071 if (!use_misc) {
1072 iov = &cmd->iov_data[0];
1073 iov_count = cmd->iov_data_count;
1074 } else {
1075 iov = &cmd->iov_misc[0];
1076 iov_count = cmd->iov_misc_count;
1077 }
1078
1079 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1080 if (tx_size != tx_sent) {
1081 if (tx_sent == -EAGAIN) {
1082 pr_err("tx_data() returned -EAGAIN\n");
1083 goto send_data;
1084 } else
1085 return -1;
1086 }
1087 cmd->tx_size = 0;
1088
1089 return 0;
1090 }
1091
1092 int iscsit_fe_sendpage_sg(
1093 struct iscsi_cmd *cmd,
1094 struct iscsi_conn *conn)
1095 {
1096 struct scatterlist *sg = cmd->first_data_sg;
1097 struct kvec iov;
1098 u32 tx_hdr_size, data_len;
1099 u32 offset = cmd->first_data_sg_off;
1100 int tx_sent, iov_off;
1101
1102 send_hdr:
1103 tx_hdr_size = ISCSI_HDR_LEN;
1104 if (conn->conn_ops->HeaderDigest)
1105 tx_hdr_size += ISCSI_CRC_LEN;
1106
1107 iov.iov_base = cmd->pdu;
1108 iov.iov_len = tx_hdr_size;
1109
1110 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1111 if (tx_hdr_size != tx_sent) {
1112 if (tx_sent == -EAGAIN) {
1113 pr_err("tx_data() returned -EAGAIN\n");
1114 goto send_hdr;
1115 }
1116 return -1;
1117 }
1118
1119 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1120 /*
1121 * Set iov_off used by padding and data digest tx_data() calls below
1122 * in order to determine proper offset into cmd->iov_data[]
1123 */
1124 if (conn->conn_ops->DataDigest) {
1125 data_len -= ISCSI_CRC_LEN;
1126 if (cmd->padding)
1127 iov_off = (cmd->iov_data_count - 2);
1128 else
1129 iov_off = (cmd->iov_data_count - 1);
1130 } else {
1131 iov_off = (cmd->iov_data_count - 1);
1132 }
1133 /*
1134 * Perform sendpage() for each page in the scatterlist
1135 */
1136 while (data_len) {
1137 u32 space = (sg->length - offset);
1138 u32 sub_len = min_t(u32, data_len, space);
1139 send_pg:
1140 tx_sent = conn->sock->ops->sendpage(conn->sock,
1141 sg_page(sg), sg->offset + offset, sub_len, 0);
1142 if (tx_sent != sub_len) {
1143 if (tx_sent == -EAGAIN) {
1144 pr_err("tcp_sendpage() returned"
1145 " -EAGAIN\n");
1146 goto send_pg;
1147 }
1148
1149 pr_err("tcp_sendpage() failure: %d\n",
1150 tx_sent);
1151 return -1;
1152 }
1153
1154 data_len -= sub_len;
1155 offset = 0;
1156 sg = sg_next(sg);
1157 }
1158
1159 send_padding:
1160 if (cmd->padding) {
1161 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1162
1163 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1164 if (cmd->padding != tx_sent) {
1165 if (tx_sent == -EAGAIN) {
1166 pr_err("tx_data() returned -EAGAIN\n");
1167 goto send_padding;
1168 }
1169 return -1;
1170 }
1171 }
1172
1173 send_datacrc:
1174 if (conn->conn_ops->DataDigest) {
1175 struct kvec *iov_d = &cmd->iov_data[iov_off];
1176
1177 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1178 if (ISCSI_CRC_LEN != tx_sent) {
1179 if (tx_sent == -EAGAIN) {
1180 pr_err("tx_data() returned -EAGAIN\n");
1181 goto send_datacrc;
1182 }
1183 return -1;
1184 }
1185 }
1186
1187 return 0;
1188 }
1189
1190 /*
1191 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1192 * back to the Initiator when an expection condition occurs with the
1193 * errors set in status_class and status_detail.
1194 *
1195 * Parameters: iSCSI Connection, Status Class, Status Detail.
1196 * Returns: 0 on success, -1 on error.
1197 */
1198 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1199 {
1200 struct iscsi_login_rsp *hdr;
1201 struct iscsi_login *login = conn->conn_login;
1202
1203 login->login_failed = 1;
1204 iscsit_collect_login_stats(conn, status_class, status_detail);
1205
1206 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1207
1208 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1209 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1210 hdr->status_class = status_class;
1211 hdr->status_detail = status_detail;
1212 hdr->itt = conn->login_itt;
1213
1214 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1215 }
1216
1217 void iscsit_print_session_params(struct iscsi_session *sess)
1218 {
1219 struct iscsi_conn *conn;
1220
1221 pr_debug("-----------------------------[Session Params for"
1222 " SID: %u]-----------------------------\n", sess->sid);
1223 spin_lock_bh(&sess->conn_lock);
1224 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1225 iscsi_dump_conn_ops(conn->conn_ops);
1226 spin_unlock_bh(&sess->conn_lock);
1227
1228 iscsi_dump_sess_ops(sess->sess_ops);
1229 }
1230
1231 static int iscsit_do_rx_data(
1232 struct iscsi_conn *conn,
1233 struct iscsi_data_count *count)
1234 {
1235 int data = count->data_length, rx_loop = 0, total_rx = 0;
1236 struct msghdr msg;
1237
1238 if (!conn || !conn->sock || !conn->conn_ops)
1239 return -1;
1240
1241 memset(&msg, 0, sizeof(struct msghdr));
1242 iov_iter_kvec(&msg.msg_iter, READ, count->iov, count->iov_count, data);
1243
1244 while (msg_data_left(&msg)) {
1245 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1246 if (rx_loop <= 0) {
1247 pr_debug("rx_loop: %d total_rx: %d\n",
1248 rx_loop, total_rx);
1249 return rx_loop;
1250 }
1251 total_rx += rx_loop;
1252 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1253 rx_loop, total_rx, data);
1254 }
1255
1256 return total_rx;
1257 }
1258
1259 int rx_data(
1260 struct iscsi_conn *conn,
1261 struct kvec *iov,
1262 int iov_count,
1263 int data)
1264 {
1265 struct iscsi_data_count c;
1266
1267 if (!conn || !conn->sock || !conn->conn_ops)
1268 return -1;
1269
1270 memset(&c, 0, sizeof(struct iscsi_data_count));
1271 c.iov = iov;
1272 c.iov_count = iov_count;
1273 c.data_length = data;
1274 c.type = ISCSI_RX_DATA;
1275
1276 return iscsit_do_rx_data(conn, &c);
1277 }
1278
1279 int tx_data(
1280 struct iscsi_conn *conn,
1281 struct kvec *iov,
1282 int iov_count,
1283 int data)
1284 {
1285 struct msghdr msg;
1286 int total_tx = 0;
1287
1288 if (!conn || !conn->sock || !conn->conn_ops)
1289 return -1;
1290
1291 if (data <= 0) {
1292 pr_err("Data length is: %d\n", data);
1293 return -1;
1294 }
1295
1296 memset(&msg, 0, sizeof(struct msghdr));
1297
1298 iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data);
1299
1300 while (msg_data_left(&msg)) {
1301 int tx_loop = sock_sendmsg(conn->sock, &msg);
1302 if (tx_loop <= 0) {
1303 pr_debug("tx_loop: %d total_tx %d\n",
1304 tx_loop, total_tx);
1305 return tx_loop;
1306 }
1307 total_tx += tx_loop;
1308 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1309 tx_loop, total_tx, data);
1310 }
1311
1312 return total_tx;
1313 }
1314
1315 void iscsit_collect_login_stats(
1316 struct iscsi_conn *conn,
1317 u8 status_class,
1318 u8 status_detail)
1319 {
1320 struct iscsi_param *intrname = NULL;
1321 struct iscsi_tiqn *tiqn;
1322 struct iscsi_login_stats *ls;
1323
1324 tiqn = iscsit_snmp_get_tiqn(conn);
1325 if (!tiqn)
1326 return;
1327
1328 ls = &tiqn->login_stats;
1329
1330 spin_lock(&ls->lock);
1331 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1332 ls->accepts++;
1333 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1334 ls->redirects++;
1335 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1336 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1337 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1338 ls->authenticate_fails++;
1339 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1340 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1341 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1342 ls->authorize_fails++;
1343 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1344 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1345 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1346 ls->negotiate_fails++;
1347 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1348 } else {
1349 ls->other_fails++;
1350 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1351 }
1352
1353 /* Save initiator name, ip address and time, if it is a failed login */
1354 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1355 if (conn->param_list)
1356 intrname = iscsi_find_param_from_key(INITIATORNAME,
1357 conn->param_list);
1358 strlcpy(ls->last_intr_fail_name,
1359 (intrname ? intrname->value : "Unknown"),
1360 sizeof(ls->last_intr_fail_name));
1361
1362 ls->last_intr_fail_ip_family = conn->login_family;
1363
1364 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1365 ls->last_fail_time = get_jiffies_64();
1366 }
1367
1368 spin_unlock(&ls->lock);
1369 }
1370
1371 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1372 {
1373 struct iscsi_portal_group *tpg;
1374
1375 if (!conn)
1376 return NULL;
1377
1378 tpg = conn->tpg;
1379 if (!tpg)
1380 return NULL;
1381
1382 if (!tpg->tpg_tiqn)
1383 return NULL;
1384
1385 return tpg->tpg_tiqn;
1386 }
1387
1388 void iscsit_fill_cxn_timeout_err_stats(struct iscsi_session *sess)
1389 {
1390 struct iscsi_portal_group *tpg = sess->tpg;
1391 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1392
1393 if (!tiqn)
1394 return;
1395
1396 spin_lock_bh(&tiqn->sess_err_stats.lock);
1397 strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1398 sess->sess_ops->InitiatorName,
1399 sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
1400 tiqn->sess_err_stats.last_sess_failure_type =
1401 ISCSI_SESS_ERR_CXN_TIMEOUT;
1402 tiqn->sess_err_stats.cxn_timeout_errors++;
1403 atomic_long_inc(&sess->conn_timeout_errors);
1404 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1405 }
Linux with added FPC-III support