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spi-topcliff-pch: supports a spi mode setup and bit order setup by IO control
[zen-stable.git] / drivers / target / iscsi / iscsi_target_util.c
blob11287e1ece134190b6541bdb2bea45a236e46515
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_list);
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 /*
180 * Called from iscsi_handle_scsi_cmd()
181 */
182 struct iscsi_cmd *iscsit_allocate_se_cmd(
183 struct iscsi_conn *conn,
184 u32 data_length,
185 int data_direction,
186 int iscsi_task_attr)
187 {
188 struct iscsi_cmd *cmd;
189 struct se_cmd *se_cmd;
190 int sam_task_attr;
191
192 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
193 if (!cmd)
194 return NULL;
195
196 cmd->data_direction = data_direction;
197 cmd->data_length = data_length;
198 /*
199 * Figure out the SAM Task Attribute for the incoming SCSI CDB
200 */
201 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
202 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
203 sam_task_attr = MSG_SIMPLE_TAG;
204 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
205 sam_task_attr = MSG_ORDERED_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
207 sam_task_attr = MSG_HEAD_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
209 sam_task_attr = MSG_ACA_TAG;
210 else {
211 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
212 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
213 sam_task_attr = MSG_SIMPLE_TAG;
214 }
215
216 se_cmd = &cmd->se_cmd;
217 /*
218 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
219 */
220 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
221 conn->sess->se_sess, data_length, data_direction,
222 sam_task_attr, &cmd->sense_buffer[0]);
223 return cmd;
224 }
225
226 struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
227 struct iscsi_conn *conn,
228 u8 function)
229 {
230 struct iscsi_cmd *cmd;
231 struct se_cmd *se_cmd;
232 u8 tcm_function;
233
234 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
235 if (!cmd)
236 return NULL;
237
238 cmd->data_direction = DMA_NONE;
239
240 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
241 if (!cmd->tmr_req) {
242 pr_err("Unable to allocate memory for"
243 " Task Management command!\n");
244 goto out;
245 }
246 /*
247 * TASK_REASSIGN for ERL=2 / connection stays inside of
248 * LIO-Target $FABRIC_MOD
249 */
250 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
251 return cmd;
252
253 se_cmd = &cmd->se_cmd;
254 /*
255 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
256 */
257 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
258 conn->sess->se_sess, 0, DMA_NONE,
259 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
260
261 switch (function) {
262 case ISCSI_TM_FUNC_ABORT_TASK:
263 tcm_function = TMR_ABORT_TASK;
264 break;
265 case ISCSI_TM_FUNC_ABORT_TASK_SET:
266 tcm_function = TMR_ABORT_TASK_SET;
267 break;
268 case ISCSI_TM_FUNC_CLEAR_ACA:
269 tcm_function = TMR_CLEAR_ACA;
270 break;
271 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
272 tcm_function = TMR_CLEAR_TASK_SET;
273 break;
274 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
275 tcm_function = TMR_LUN_RESET;
276 break;
277 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
278 tcm_function = TMR_TARGET_WARM_RESET;
279 break;
280 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
281 tcm_function = TMR_TARGET_COLD_RESET;
282 break;
283 default:
284 pr_err("Unknown iSCSI TMR Function:"
285 " 0x%02x\n", function);
286 goto out;
287 }
288
289 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
290 cmd->tmr_req, tcm_function,
291 GFP_KERNEL);
292 if (!se_cmd->se_tmr_req)
293 goto out;
294
295 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
296
297 return cmd;
298 out:
299 iscsit_release_cmd(cmd);
300 return NULL;
301 }
302
303 int iscsit_decide_list_to_build(
304 struct iscsi_cmd *cmd,
305 u32 immediate_data_length)
306 {
307 struct iscsi_build_list bl;
308 struct iscsi_conn *conn = cmd->conn;
309 struct iscsi_session *sess = conn->sess;
310 struct iscsi_node_attrib *na;
311
312 if (sess->sess_ops->DataSequenceInOrder &&
313 sess->sess_ops->DataPDUInOrder)
314 return 0;
315
316 if (cmd->data_direction == DMA_NONE)
317 return 0;
318
319 na = iscsit_tpg_get_node_attrib(sess);
320 memset(&bl, 0, sizeof(struct iscsi_build_list));
321
322 if (cmd->data_direction == DMA_FROM_DEVICE) {
323 bl.data_direction = ISCSI_PDU_READ;
324 bl.type = PDULIST_NORMAL;
325 if (na->random_datain_pdu_offsets)
326 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
327 if (na->random_datain_seq_offsets)
328 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
329 } else {
330 bl.data_direction = ISCSI_PDU_WRITE;
331 bl.immediate_data_length = immediate_data_length;
332 if (na->random_r2t_offsets)
333 bl.randomize |= RANDOM_R2T_OFFSETS;
334
335 if (!cmd->immediate_data && !cmd->unsolicited_data)
336 bl.type = PDULIST_NORMAL;
337 else if (cmd->immediate_data && !cmd->unsolicited_data)
338 bl.type = PDULIST_IMMEDIATE;
339 else if (!cmd->immediate_data && cmd->unsolicited_data)
340 bl.type = PDULIST_UNSOLICITED;
341 else if (cmd->immediate_data && cmd->unsolicited_data)
342 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
343 }
344
345 return iscsit_do_build_list(cmd, &bl);
346 }
347
348 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
349 struct iscsi_cmd *cmd,
350 u32 seq_send_order)
351 {
352 u32 i;
353
354 for (i = 0; i < cmd->seq_count; i++)
355 if (cmd->seq_list[i].seq_send_order == seq_send_order)
356 return &cmd->seq_list[i];
357
358 return NULL;
359 }
360
361 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
362 {
363 u32 i;
364
365 if (!cmd->seq_list) {
366 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
367 return NULL;
368 }
369
370 for (i = 0; i < cmd->seq_count; i++) {
371 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
372 continue;
373 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
374 cmd->seq_send_order++;
375 return &cmd->seq_list[i];
376 }
377 }
378
379 return NULL;
380 }
381
382 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
383 struct iscsi_cmd *cmd,
384 u32 r2t_sn)
385 {
386 struct iscsi_r2t *r2t;
387
388 spin_lock_bh(&cmd->r2t_lock);
389 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
390 if (r2t->r2t_sn == r2t_sn) {
391 spin_unlock_bh(&cmd->r2t_lock);
392 return r2t;
393 }
394 }
395 spin_unlock_bh(&cmd->r2t_lock);
396
397 return NULL;
398 }
399
400 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
401 {
402 int ret;
403
404 /*
405 * This is the proper method of checking received CmdSN against
406 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
407 * or order CmdSNs due to multiple connection sessions and/or
408 * CRC failures.
409 */
410 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
411 pr_err("Received CmdSN: 0x%08x is greater than"
412 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
413 sess->max_cmd_sn);
414 ret = CMDSN_ERROR_CANNOT_RECOVER;
415
416 } else if (cmdsn == sess->exp_cmd_sn) {
417 sess->exp_cmd_sn++;
418 pr_debug("Received CmdSN matches ExpCmdSN,"
419 " incremented ExpCmdSN to: 0x%08x\n",
420 sess->exp_cmd_sn);
421 ret = CMDSN_NORMAL_OPERATION;
422
423 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
424 pr_debug("Received CmdSN: 0x%08x is greater"
425 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
426 cmdsn, sess->exp_cmd_sn);
427 ret = CMDSN_HIGHER_THAN_EXP;
428
429 } else {
430 pr_err("Received CmdSN: 0x%08x is less than"
431 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
432 sess->exp_cmd_sn);
433 ret = CMDSN_LOWER_THAN_EXP;
434 }
435
436 return ret;
437 }
438
439 /*
440 * Commands may be received out of order if MC/S is in use.
441 * Ensure they are executed in CmdSN order.
442 */
443 int iscsit_sequence_cmd(
444 struct iscsi_conn *conn,
445 struct iscsi_cmd *cmd,
446 u32 cmdsn)
447 {
448 int ret;
449 int cmdsn_ret;
450
451 mutex_lock(&conn->sess->cmdsn_mutex);
452
453 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
454 switch (cmdsn_ret) {
455 case CMDSN_NORMAL_OPERATION:
456 ret = iscsit_execute_cmd(cmd, 0);
457 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
458 iscsit_execute_ooo_cmdsns(conn->sess);
459 break;
460 case CMDSN_HIGHER_THAN_EXP:
461 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
462 break;
463 case CMDSN_LOWER_THAN_EXP:
464 cmd->i_state = ISTATE_REMOVE;
465 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
466 ret = cmdsn_ret;
467 break;
468 default:
469 ret = cmdsn_ret;
470 break;
471 }
472 mutex_unlock(&conn->sess->cmdsn_mutex);
473
474 return ret;
475 }
476
477 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
478 {
479 struct iscsi_conn *conn = cmd->conn;
480 struct se_cmd *se_cmd = &cmd->se_cmd;
481 struct iscsi_data *hdr = (struct iscsi_data *) buf;
482 u32 payload_length = ntoh24(hdr->dlength);
483
484 if (conn->sess->sess_ops->InitialR2T) {
485 pr_err("Received unexpected unsolicited data"
486 " while InitialR2T=Yes, protocol error.\n");
487 transport_send_check_condition_and_sense(se_cmd,
488 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
489 return -1;
490 }
491
492 if ((cmd->first_burst_len + payload_length) >
493 conn->sess->sess_ops->FirstBurstLength) {
494 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
495 " for this Unsolicited DataOut Burst.\n",
496 (cmd->first_burst_len + payload_length),
497 conn->sess->sess_ops->FirstBurstLength);
498 transport_send_check_condition_and_sense(se_cmd,
499 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
500 return -1;
501 }
502
503 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
504 return 0;
505
506 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
507 ((cmd->first_burst_len + payload_length) !=
508 conn->sess->sess_ops->FirstBurstLength)) {
509 pr_err("Unsolicited non-immediate data received %u"
510 " does not equal FirstBurstLength: %u, and does"
511 " not equal ExpXferLen %u.\n",
512 (cmd->first_burst_len + payload_length),
513 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
514 transport_send_check_condition_and_sense(se_cmd,
515 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
516 return -1;
517 }
518 return 0;
519 }
520
521 struct iscsi_cmd *iscsit_find_cmd_from_itt(
522 struct iscsi_conn *conn,
523 u32 init_task_tag)
524 {
525 struct iscsi_cmd *cmd;
526
527 spin_lock_bh(&conn->cmd_lock);
528 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
529 if (cmd->init_task_tag == init_task_tag) {
530 spin_unlock_bh(&conn->cmd_lock);
531 return cmd;
532 }
533 }
534 spin_unlock_bh(&conn->cmd_lock);
535
536 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
537 init_task_tag, conn->cid);
538 return NULL;
539 }
540
541 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
542 struct iscsi_conn *conn,
543 u32 init_task_tag,
544 u32 length)
545 {
546 struct iscsi_cmd *cmd;
547
548 spin_lock_bh(&conn->cmd_lock);
549 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
550 if (cmd->init_task_tag == init_task_tag) {
551 spin_unlock_bh(&conn->cmd_lock);
552 return cmd;
553 }
554 }
555 spin_unlock_bh(&conn->cmd_lock);
556
557 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
558 " dumping payload\n", init_task_tag, conn->cid);
559 if (length)
560 iscsit_dump_data_payload(conn, length, 1);
561
562 return NULL;
563 }
564
565 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
566 struct iscsi_conn *conn,
567 u32 targ_xfer_tag)
568 {
569 struct iscsi_cmd *cmd = NULL;
570
571 spin_lock_bh(&conn->cmd_lock);
572 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
573 if (cmd->targ_xfer_tag == targ_xfer_tag) {
574 spin_unlock_bh(&conn->cmd_lock);
575 return cmd;
576 }
577 }
578 spin_unlock_bh(&conn->cmd_lock);
579
580 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
581 targ_xfer_tag, conn->cid);
582 return NULL;
583 }
584
585 int iscsit_find_cmd_for_recovery(
586 struct iscsi_session *sess,
587 struct iscsi_cmd **cmd_ptr,
588 struct iscsi_conn_recovery **cr_ptr,
589 u32 init_task_tag)
590 {
591 struct iscsi_cmd *cmd = NULL;
592 struct iscsi_conn_recovery *cr;
593 /*
594 * Scan through the inactive connection recovery list's command list.
595 * If init_task_tag matches the command is still alligent.
596 */
597 spin_lock(&sess->cr_i_lock);
598 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
599 spin_lock(&cr->conn_recovery_cmd_lock);
600 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
601 if (cmd->init_task_tag == init_task_tag) {
602 spin_unlock(&cr->conn_recovery_cmd_lock);
603 spin_unlock(&sess->cr_i_lock);
604
605 *cr_ptr = cr;
606 *cmd_ptr = cmd;
607 return -2;
608 }
609 }
610 spin_unlock(&cr->conn_recovery_cmd_lock);
611 }
612 spin_unlock(&sess->cr_i_lock);
613 /*
614 * Scan through the active connection recovery list's command list.
615 * If init_task_tag matches the command is ready to be reassigned.
616 */
617 spin_lock(&sess->cr_a_lock);
618 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
619 spin_lock(&cr->conn_recovery_cmd_lock);
620 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
621 if (cmd->init_task_tag == init_task_tag) {
622 spin_unlock(&cr->conn_recovery_cmd_lock);
623 spin_unlock(&sess->cr_a_lock);
624
625 *cr_ptr = cr;
626 *cmd_ptr = cmd;
627 return 0;
628 }
629 }
630 spin_unlock(&cr->conn_recovery_cmd_lock);
631 }
632 spin_unlock(&sess->cr_a_lock);
633
634 return -1;
635 }
636
637 void iscsit_add_cmd_to_immediate_queue(
638 struct iscsi_cmd *cmd,
639 struct iscsi_conn *conn,
640 u8 state)
641 {
642 struct iscsi_queue_req *qr;
643
644 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
645 if (!qr) {
646 pr_err("Unable to allocate memory for"
647 " struct iscsi_queue_req\n");
648 return;
649 }
650 INIT_LIST_HEAD(&qr->qr_list);
651 qr->cmd = cmd;
652 qr->state = state;
653
654 spin_lock_bh(&conn->immed_queue_lock);
655 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
656 atomic_inc(&cmd->immed_queue_count);
657 atomic_set(&conn->check_immediate_queue, 1);
658 spin_unlock_bh(&conn->immed_queue_lock);
659
660 wake_up_process(conn->thread_set->tx_thread);
661 }
662
663 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
664 {
665 struct iscsi_queue_req *qr;
666
667 spin_lock_bh(&conn->immed_queue_lock);
668 if (list_empty(&conn->immed_queue_list)) {
669 spin_unlock_bh(&conn->immed_queue_lock);
670 return NULL;
671 }
672 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
673 break;
674
675 list_del(&qr->qr_list);
676 if (qr->cmd)
677 atomic_dec(&qr->cmd->immed_queue_count);
678 spin_unlock_bh(&conn->immed_queue_lock);
679
680 return qr;
681 }
682
683 static void iscsit_remove_cmd_from_immediate_queue(
684 struct iscsi_cmd *cmd,
685 struct iscsi_conn *conn)
686 {
687 struct iscsi_queue_req *qr, *qr_tmp;
688
689 spin_lock_bh(&conn->immed_queue_lock);
690 if (!atomic_read(&cmd->immed_queue_count)) {
691 spin_unlock_bh(&conn->immed_queue_lock);
692 return;
693 }
694
695 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
696 if (qr->cmd != cmd)
697 continue;
698
699 atomic_dec(&qr->cmd->immed_queue_count);
700 list_del(&qr->qr_list);
701 kmem_cache_free(lio_qr_cache, qr);
702 }
703 spin_unlock_bh(&conn->immed_queue_lock);
704
705 if (atomic_read(&cmd->immed_queue_count)) {
706 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
707 cmd->init_task_tag,
708 atomic_read(&cmd->immed_queue_count));
709 }
710 }
711
712 void iscsit_add_cmd_to_response_queue(
713 struct iscsi_cmd *cmd,
714 struct iscsi_conn *conn,
715 u8 state)
716 {
717 struct iscsi_queue_req *qr;
718
719 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
720 if (!qr) {
721 pr_err("Unable to allocate memory for"
722 " struct iscsi_queue_req\n");
723 return;
724 }
725 INIT_LIST_HEAD(&qr->qr_list);
726 qr->cmd = cmd;
727 qr->state = state;
728
729 spin_lock_bh(&conn->response_queue_lock);
730 list_add_tail(&qr->qr_list, &conn->response_queue_list);
731 atomic_inc(&cmd->response_queue_count);
732 spin_unlock_bh(&conn->response_queue_lock);
733
734 wake_up_process(conn->thread_set->tx_thread);
735 }
736
737 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
738 {
739 struct iscsi_queue_req *qr;
740
741 spin_lock_bh(&conn->response_queue_lock);
742 if (list_empty(&conn->response_queue_list)) {
743 spin_unlock_bh(&conn->response_queue_lock);
744 return NULL;
745 }
746
747 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
748 break;
749
750 list_del(&qr->qr_list);
751 if (qr->cmd)
752 atomic_dec(&qr->cmd->response_queue_count);
753 spin_unlock_bh(&conn->response_queue_lock);
754
755 return qr;
756 }
757
758 static void iscsit_remove_cmd_from_response_queue(
759 struct iscsi_cmd *cmd,
760 struct iscsi_conn *conn)
761 {
762 struct iscsi_queue_req *qr, *qr_tmp;
763
764 spin_lock_bh(&conn->response_queue_lock);
765 if (!atomic_read(&cmd->response_queue_count)) {
766 spin_unlock_bh(&conn->response_queue_lock);
767 return;
768 }
769
770 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
771 qr_list) {
772 if (qr->cmd != cmd)
773 continue;
774
775 atomic_dec(&qr->cmd->response_queue_count);
776 list_del(&qr->qr_list);
777 kmem_cache_free(lio_qr_cache, qr);
778 }
779 spin_unlock_bh(&conn->response_queue_lock);
780
781 if (atomic_read(&cmd->response_queue_count)) {
782 pr_err("ITT: 0x%08x response_queue_count: %d\n",
783 cmd->init_task_tag,
784 atomic_read(&cmd->response_queue_count));
785 }
786 }
787
788 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
789 {
790 struct iscsi_queue_req *qr, *qr_tmp;
791
792 spin_lock_bh(&conn->immed_queue_lock);
793 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
794 list_del(&qr->qr_list);
795 if (qr->cmd)
796 atomic_dec(&qr->cmd->immed_queue_count);
797
798 kmem_cache_free(lio_qr_cache, qr);
799 }
800 spin_unlock_bh(&conn->immed_queue_lock);
801
802 spin_lock_bh(&conn->response_queue_lock);
803 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
804 qr_list) {
805 list_del(&qr->qr_list);
806 if (qr->cmd)
807 atomic_dec(&qr->cmd->response_queue_count);
808
809 kmem_cache_free(lio_qr_cache, qr);
810 }
811 spin_unlock_bh(&conn->response_queue_lock);
812 }
813
814 void iscsit_release_cmd(struct iscsi_cmd *cmd)
815 {
816 struct iscsi_conn *conn = cmd->conn;
817 int i;
818
819 iscsit_free_r2ts_from_list(cmd);
820 iscsit_free_all_datain_reqs(cmd);
821
822 kfree(cmd->buf_ptr);
823 kfree(cmd->pdu_list);
824 kfree(cmd->seq_list);
825 kfree(cmd->tmr_req);
826 kfree(cmd->iov_data);
827
828 for (i = 0; i < cmd->t_mem_sg_nents; i++)
829 __free_page(sg_page(&cmd->t_mem_sg[i]));
830
831 kfree(cmd->t_mem_sg);
832
833 if (conn) {
834 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
835 iscsit_remove_cmd_from_response_queue(cmd, conn);
836 }
837
838 kmem_cache_free(lio_cmd_cache, cmd);
839 }
840
841 void iscsit_free_cmd(struct iscsi_cmd *cmd)
842 {
843 /*
844 * Determine if a struct se_cmd is assoicated with
845 * this struct iscsi_cmd.
846 */
847 switch (cmd->iscsi_opcode) {
848 case ISCSI_OP_SCSI_CMD:
849 case ISCSI_OP_SCSI_TMFUNC:
850 transport_generic_free_cmd(&cmd->se_cmd, 1);
851 break;
852 case ISCSI_OP_REJECT:
853 /*
854 * Handle special case for REJECT when iscsi_add_reject*() has
855 * overwritten the original iscsi_opcode assignment, and the
856 * associated cmd->se_cmd needs to be released.
857 */
858 if (cmd->se_cmd.se_tfo != NULL) {
859 transport_generic_free_cmd(&cmd->se_cmd, 1);
860 break;
861 }
862 /* Fall-through */
863 default:
864 iscsit_release_cmd(cmd);
865 break;
866 }
867 }
868
869 int iscsit_check_session_usage_count(struct iscsi_session *sess)
870 {
871 spin_lock_bh(&sess->session_usage_lock);
872 if (sess->session_usage_count != 0) {
873 sess->session_waiting_on_uc = 1;
874 spin_unlock_bh(&sess->session_usage_lock);
875 if (in_interrupt())
876 return 2;
877
878 wait_for_completion(&sess->session_waiting_on_uc_comp);
879 return 1;
880 }
881 spin_unlock_bh(&sess->session_usage_lock);
882
883 return 0;
884 }
885
886 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
887 {
888 spin_lock_bh(&sess->session_usage_lock);
889 sess->session_usage_count--;
890
891 if (!sess->session_usage_count && sess->session_waiting_on_uc)
892 complete(&sess->session_waiting_on_uc_comp);
893
894 spin_unlock_bh(&sess->session_usage_lock);
895 }
896
897 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
898 {
899 spin_lock_bh(&sess->session_usage_lock);
900 sess->session_usage_count++;
901 spin_unlock_bh(&sess->session_usage_lock);
902 }
903
904 /*
905 * Setup conn->if_marker and conn->of_marker values based upon
906 * the initial marker-less interval. (see iSCSI v19 A.2)
907 */
908 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
909 {
910 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
911 /*
912 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
913 */
914 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
915 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
916
917 if (conn->conn_ops->OFMarker) {
918 /*
919 * Account for the first Login Command received not
920 * via iscsi_recv_msg().
921 */
922 conn->of_marker += ISCSI_HDR_LEN;
923 if (conn->of_marker <= OFMarkInt) {
924 conn->of_marker = (OFMarkInt - conn->of_marker);
925 } else {
926 login_ofmarker_count = (conn->of_marker / OFMarkInt);
927 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
928 (login_ofmarker_count * MARKER_SIZE);
929 conn->of_marker = (next_marker - conn->of_marker);
930 }
931 conn->of_marker_offset = 0;
932 pr_debug("Setting OFMarker value to %u based on Initial"
933 " Markerless Interval.\n", conn->of_marker);
934 }
935
936 if (conn->conn_ops->IFMarker) {
937 if (conn->if_marker <= IFMarkInt) {
938 conn->if_marker = (IFMarkInt - conn->if_marker);
939 } else {
940 login_ifmarker_count = (conn->if_marker / IFMarkInt);
941 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
942 (login_ifmarker_count * MARKER_SIZE);
943 conn->if_marker = (next_marker - conn->if_marker);
944 }
945 pr_debug("Setting IFMarker value to %u based on Initial"
946 " Markerless Interval.\n", conn->if_marker);
947 }
948
949 return 0;
950 }
951
952 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
953 {
954 struct iscsi_conn *conn;
955
956 spin_lock_bh(&sess->conn_lock);
957 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
958 if ((conn->cid == cid) &&
959 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
960 iscsit_inc_conn_usage_count(conn);
961 spin_unlock_bh(&sess->conn_lock);
962 return conn;
963 }
964 }
965 spin_unlock_bh(&sess->conn_lock);
966
967 return NULL;
968 }
969
970 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
971 {
972 struct iscsi_conn *conn;
973
974 spin_lock_bh(&sess->conn_lock);
975 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
976 if (conn->cid == cid) {
977 iscsit_inc_conn_usage_count(conn);
978 spin_lock(&conn->state_lock);
979 atomic_set(&conn->connection_wait_rcfr, 1);
980 spin_unlock(&conn->state_lock);
981 spin_unlock_bh(&sess->conn_lock);
982 return conn;
983 }
984 }
985 spin_unlock_bh(&sess->conn_lock);
986
987 return NULL;
988 }
989
990 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
991 {
992 spin_lock_bh(&conn->conn_usage_lock);
993 if (conn->conn_usage_count != 0) {
994 conn->conn_waiting_on_uc = 1;
995 spin_unlock_bh(&conn->conn_usage_lock);
996
997 wait_for_completion(&conn->conn_waiting_on_uc_comp);
998 return;
999 }
1000 spin_unlock_bh(&conn->conn_usage_lock);
1001 }
1002
1003 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
1004 {
1005 spin_lock_bh(&conn->conn_usage_lock);
1006 conn->conn_usage_count--;
1007
1008 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
1009 complete(&conn->conn_waiting_on_uc_comp);
1010
1011 spin_unlock_bh(&conn->conn_usage_lock);
1012 }
1013
1014 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1015 {
1016 spin_lock_bh(&conn->conn_usage_lock);
1017 conn->conn_usage_count++;
1018 spin_unlock_bh(&conn->conn_usage_lock);
1019 }
1020
1021 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1022 {
1023 u8 state;
1024 struct iscsi_cmd *cmd;
1025
1026 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1027 if (!cmd)
1028 return -1;
1029
1030 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1031 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1032 ISTATE_SEND_NOPIN_NO_RESPONSE;
1033 cmd->init_task_tag = 0xFFFFFFFF;
1034 spin_lock_bh(&conn->sess->ttt_lock);
1035 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1036 0xFFFFFFFF;
1037 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1038 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1039 spin_unlock_bh(&conn->sess->ttt_lock);
1040
1041 spin_lock_bh(&conn->cmd_lock);
1042 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1043 spin_unlock_bh(&conn->cmd_lock);
1044
1045 if (want_response)
1046 iscsit_start_nopin_response_timer(conn);
1047 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1048
1049 return 0;
1050 }
1051
1052 static void iscsit_handle_nopin_response_timeout(unsigned long data)
1053 {
1054 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1055
1056 iscsit_inc_conn_usage_count(conn);
1057
1058 spin_lock_bh(&conn->nopin_timer_lock);
1059 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1060 spin_unlock_bh(&conn->nopin_timer_lock);
1061 iscsit_dec_conn_usage_count(conn);
1062 return;
1063 }
1064
1065 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1066 " SID: %u, failing connection.\n", conn->cid,
1067 conn->sess->sid);
1068 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1069 spin_unlock_bh(&conn->nopin_timer_lock);
1070
1071 {
1072 struct iscsi_portal_group *tpg = conn->sess->tpg;
1073 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1074
1075 if (tiqn) {
1076 spin_lock_bh(&tiqn->sess_err_stats.lock);
1077 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1078 conn->sess->sess_ops->InitiatorName);
1079 tiqn->sess_err_stats.last_sess_failure_type =
1080 ISCSI_SESS_ERR_CXN_TIMEOUT;
1081 tiqn->sess_err_stats.cxn_timeout_errors++;
1082 conn->sess->conn_timeout_errors++;
1083 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1084 }
1085 }
1086
1087 iscsit_cause_connection_reinstatement(conn, 0);
1088 iscsit_dec_conn_usage_count(conn);
1089 }
1090
1091 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1092 {
1093 struct iscsi_session *sess = conn->sess;
1094 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1095
1096 spin_lock_bh(&conn->nopin_timer_lock);
1097 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1098 spin_unlock_bh(&conn->nopin_timer_lock);
1099 return;
1100 }
1101
1102 mod_timer(&conn->nopin_response_timer,
1103 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1104 spin_unlock_bh(&conn->nopin_timer_lock);
1105 }
1106
1107 /*
1108 * Called with conn->nopin_timer_lock held.
1109 */
1110 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1111 {
1112 struct iscsi_session *sess = conn->sess;
1113 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1114
1115 spin_lock_bh(&conn->nopin_timer_lock);
1116 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1117 spin_unlock_bh(&conn->nopin_timer_lock);
1118 return;
1119 }
1120
1121 init_timer(&conn->nopin_response_timer);
1122 conn->nopin_response_timer.expires =
1123 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1124 conn->nopin_response_timer.data = (unsigned long)conn;
1125 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1126 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1127 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1128 add_timer(&conn->nopin_response_timer);
1129
1130 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1131 " seconds\n", conn->cid, na->nopin_response_timeout);
1132 spin_unlock_bh(&conn->nopin_timer_lock);
1133 }
1134
1135 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1136 {
1137 spin_lock_bh(&conn->nopin_timer_lock);
1138 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1139 spin_unlock_bh(&conn->nopin_timer_lock);
1140 return;
1141 }
1142 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1143 spin_unlock_bh(&conn->nopin_timer_lock);
1144
1145 del_timer_sync(&conn->nopin_response_timer);
1146
1147 spin_lock_bh(&conn->nopin_timer_lock);
1148 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1149 spin_unlock_bh(&conn->nopin_timer_lock);
1150 }
1151
1152 static void iscsit_handle_nopin_timeout(unsigned long data)
1153 {
1154 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1155
1156 iscsit_inc_conn_usage_count(conn);
1157
1158 spin_lock_bh(&conn->nopin_timer_lock);
1159 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1160 spin_unlock_bh(&conn->nopin_timer_lock);
1161 iscsit_dec_conn_usage_count(conn);
1162 return;
1163 }
1164 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1165 spin_unlock_bh(&conn->nopin_timer_lock);
1166
1167 iscsit_add_nopin(conn, 1);
1168 iscsit_dec_conn_usage_count(conn);
1169 }
1170
1171 /*
1172 * Called with conn->nopin_timer_lock held.
1173 */
1174 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1175 {
1176 struct iscsi_session *sess = conn->sess;
1177 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1178 /*
1179 * NOPIN timeout is disabled.
1180 */
1181 if (!na->nopin_timeout)
1182 return;
1183
1184 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1185 return;
1186
1187 init_timer(&conn->nopin_timer);
1188 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1189 conn->nopin_timer.data = (unsigned long)conn;
1190 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1191 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1192 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1193 add_timer(&conn->nopin_timer);
1194
1195 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1196 " interval\n", conn->cid, na->nopin_timeout);
1197 }
1198
1199 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1200 {
1201 struct iscsi_session *sess = conn->sess;
1202 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1203 /*
1204 * NOPIN timeout is disabled..
1205 */
1206 if (!na->nopin_timeout)
1207 return;
1208
1209 spin_lock_bh(&conn->nopin_timer_lock);
1210 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1211 spin_unlock_bh(&conn->nopin_timer_lock);
1212 return;
1213 }
1214
1215 init_timer(&conn->nopin_timer);
1216 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1217 conn->nopin_timer.data = (unsigned long)conn;
1218 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1219 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1220 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1221 add_timer(&conn->nopin_timer);
1222
1223 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1224 " interval\n", conn->cid, na->nopin_timeout);
1225 spin_unlock_bh(&conn->nopin_timer_lock);
1226 }
1227
1228 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1229 {
1230 spin_lock_bh(&conn->nopin_timer_lock);
1231 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1232 spin_unlock_bh(&conn->nopin_timer_lock);
1233 return;
1234 }
1235 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1236 spin_unlock_bh(&conn->nopin_timer_lock);
1237
1238 del_timer_sync(&conn->nopin_timer);
1239
1240 spin_lock_bh(&conn->nopin_timer_lock);
1241 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1242 spin_unlock_bh(&conn->nopin_timer_lock);
1243 }
1244
1245 int iscsit_send_tx_data(
1246 struct iscsi_cmd *cmd,
1247 struct iscsi_conn *conn,
1248 int use_misc)
1249 {
1250 int tx_sent, tx_size;
1251 u32 iov_count;
1252 struct kvec *iov;
1253
1254 send_data:
1255 tx_size = cmd->tx_size;
1256
1257 if (!use_misc) {
1258 iov = &cmd->iov_data[0];
1259 iov_count = cmd->iov_data_count;
1260 } else {
1261 iov = &cmd->iov_misc[0];
1262 iov_count = cmd->iov_misc_count;
1263 }
1264
1265 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1266 if (tx_size != tx_sent) {
1267 if (tx_sent == -EAGAIN) {
1268 pr_err("tx_data() returned -EAGAIN\n");
1269 goto send_data;
1270 } else
1271 return -1;
1272 }
1273 cmd->tx_size = 0;
1274
1275 return 0;
1276 }
1277
1278 int iscsit_fe_sendpage_sg(
1279 struct iscsi_cmd *cmd,
1280 struct iscsi_conn *conn)
1281 {
1282 struct scatterlist *sg = cmd->first_data_sg;
1283 struct kvec iov;
1284 u32 tx_hdr_size, data_len;
1285 u32 offset = cmd->first_data_sg_off;
1286 int tx_sent, iov_off;
1287
1288 send_hdr:
1289 tx_hdr_size = ISCSI_HDR_LEN;
1290 if (conn->conn_ops->HeaderDigest)
1291 tx_hdr_size += ISCSI_CRC_LEN;
1292
1293 iov.iov_base = cmd->pdu;
1294 iov.iov_len = tx_hdr_size;
1295
1296 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1297 if (tx_hdr_size != tx_sent) {
1298 if (tx_sent == -EAGAIN) {
1299 pr_err("tx_data() returned -EAGAIN\n");
1300 goto send_hdr;
1301 }
1302 return -1;
1303 }
1304
1305 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1306 /*
1307 * Set iov_off used by padding and data digest tx_data() calls below
1308 * in order to determine proper offset into cmd->iov_data[]
1309 */
1310 if (conn->conn_ops->DataDigest) {
1311 data_len -= ISCSI_CRC_LEN;
1312 if (cmd->padding)
1313 iov_off = (cmd->iov_data_count - 2);
1314 else
1315 iov_off = (cmd->iov_data_count - 1);
1316 } else {
1317 iov_off = (cmd->iov_data_count - 1);
1318 }
1319 /*
1320 * Perform sendpage() for each page in the scatterlist
1321 */
1322 while (data_len) {
1323 u32 space = (sg->length - offset);
1324 u32 sub_len = min_t(u32, data_len, space);
1325 send_pg:
1326 tx_sent = conn->sock->ops->sendpage(conn->sock,
1327 sg_page(sg), sg->offset + offset, sub_len, 0);
1328 if (tx_sent != sub_len) {
1329 if (tx_sent == -EAGAIN) {
1330 pr_err("tcp_sendpage() returned"
1331 " -EAGAIN\n");
1332 goto send_pg;
1333 }
1334
1335 pr_err("tcp_sendpage() failure: %d\n",
1336 tx_sent);
1337 return -1;
1338 }
1339
1340 data_len -= sub_len;
1341 offset = 0;
1342 sg = sg_next(sg);
1343 }
1344
1345 send_padding:
1346 if (cmd->padding) {
1347 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1348
1349 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1350 if (cmd->padding != tx_sent) {
1351 if (tx_sent == -EAGAIN) {
1352 pr_err("tx_data() returned -EAGAIN\n");
1353 goto send_padding;
1354 }
1355 return -1;
1356 }
1357 }
1358
1359 send_datacrc:
1360 if (conn->conn_ops->DataDigest) {
1361 struct kvec *iov_d = &cmd->iov_data[iov_off];
1362
1363 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1364 if (ISCSI_CRC_LEN != tx_sent) {
1365 if (tx_sent == -EAGAIN) {
1366 pr_err("tx_data() returned -EAGAIN\n");
1367 goto send_datacrc;
1368 }
1369 return -1;
1370 }
1371 }
1372
1373 return 0;
1374 }
1375
1376 /*
1377 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1378 * back to the Initiator when an expection condition occurs with the
1379 * errors set in status_class and status_detail.
1380 *
1381 * Parameters: iSCSI Connection, Status Class, Status Detail.
1382 * Returns: 0 on success, -1 on error.
1383 */
1384 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1385 {
1386 u8 iscsi_hdr[ISCSI_HDR_LEN];
1387 int err;
1388 struct kvec iov;
1389 struct iscsi_login_rsp *hdr;
1390
1391 iscsit_collect_login_stats(conn, status_class, status_detail);
1392
1393 memset(&iov, 0, sizeof(struct kvec));
1394 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1395
1396 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1397 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1398 hdr->status_class = status_class;
1399 hdr->status_detail = status_detail;
1400 hdr->itt = cpu_to_be32(conn->login_itt);
1401
1402 iov.iov_base = &iscsi_hdr;
1403 iov.iov_len = ISCSI_HDR_LEN;
1404
1405 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1406
1407 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1408 if (err != ISCSI_HDR_LEN) {
1409 pr_err("tx_data returned less than expected\n");
1410 return -1;
1411 }
1412
1413 return 0;
1414 }
1415
1416 void iscsit_print_session_params(struct iscsi_session *sess)
1417 {
1418 struct iscsi_conn *conn;
1419
1420 pr_debug("-----------------------------[Session Params for"
1421 " SID: %u]-----------------------------\n", sess->sid);
1422 spin_lock_bh(&sess->conn_lock);
1423 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1424 iscsi_dump_conn_ops(conn->conn_ops);
1425 spin_unlock_bh(&sess->conn_lock);
1426
1427 iscsi_dump_sess_ops(sess->sess_ops);
1428 }
1429
1430 static int iscsit_do_rx_data(
1431 struct iscsi_conn *conn,
1432 struct iscsi_data_count *count)
1433 {
1434 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1435 struct kvec *iov_p;
1436 struct msghdr msg;
1437
1438 if (!conn || !conn->sock || !conn->conn_ops)
1439 return -1;
1440
1441 memset(&msg, 0, sizeof(struct msghdr));
1442
1443 iov_p = count->iov;
1444 iov_len = count->iov_count;
1445
1446 while (total_rx < data) {
1447 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1448 (data - total_rx), MSG_WAITALL);
1449 if (rx_loop <= 0) {
1450 pr_debug("rx_loop: %d total_rx: %d\n",
1451 rx_loop, total_rx);
1452 return rx_loop;
1453 }
1454 total_rx += rx_loop;
1455 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1456 rx_loop, total_rx, data);
1457 }
1458
1459 return total_rx;
1460 }
1461
1462 static int iscsit_do_tx_data(
1463 struct iscsi_conn *conn,
1464 struct iscsi_data_count *count)
1465 {
1466 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1467 struct kvec *iov_p;
1468 struct msghdr msg;
1469
1470 if (!conn || !conn->sock || !conn->conn_ops)
1471 return -1;
1472
1473 if (data <= 0) {
1474 pr_err("Data length is: %d\n", data);
1475 return -1;
1476 }
1477
1478 memset(&msg, 0, sizeof(struct msghdr));
1479
1480 iov_p = count->iov;
1481 iov_len = count->iov_count;
1482
1483 while (total_tx < data) {
1484 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1485 (data - total_tx));
1486 if (tx_loop <= 0) {
1487 pr_debug("tx_loop: %d total_tx %d\n",
1488 tx_loop, total_tx);
1489 return tx_loop;
1490 }
1491 total_tx += tx_loop;
1492 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1493 tx_loop, total_tx, data);
1494 }
1495
1496 return total_tx;
1497 }
1498
1499 int rx_data(
1500 struct iscsi_conn *conn,
1501 struct kvec *iov,
1502 int iov_count,
1503 int data)
1504 {
1505 struct iscsi_data_count c;
1506
1507 if (!conn || !conn->sock || !conn->conn_ops)
1508 return -1;
1509
1510 memset(&c, 0, sizeof(struct iscsi_data_count));
1511 c.iov = iov;
1512 c.iov_count = iov_count;
1513 c.data_length = data;
1514 c.type = ISCSI_RX_DATA;
1515
1516 return iscsit_do_rx_data(conn, &c);
1517 }
1518
1519 int tx_data(
1520 struct iscsi_conn *conn,
1521 struct kvec *iov,
1522 int iov_count,
1523 int data)
1524 {
1525 struct iscsi_data_count c;
1526
1527 if (!conn || !conn->sock || !conn->conn_ops)
1528 return -1;
1529
1530 memset(&c, 0, sizeof(struct iscsi_data_count));
1531 c.iov = iov;
1532 c.iov_count = iov_count;
1533 c.data_length = data;
1534 c.type = ISCSI_TX_DATA;
1535
1536 return iscsit_do_tx_data(conn, &c);
1537 }
1538
1539 void iscsit_collect_login_stats(
1540 struct iscsi_conn *conn,
1541 u8 status_class,
1542 u8 status_detail)
1543 {
1544 struct iscsi_param *intrname = NULL;
1545 struct iscsi_tiqn *tiqn;
1546 struct iscsi_login_stats *ls;
1547
1548 tiqn = iscsit_snmp_get_tiqn(conn);
1549 if (!tiqn)
1550 return;
1551
1552 ls = &tiqn->login_stats;
1553
1554 spin_lock(&ls->lock);
1555 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1556 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1557 /* We already have the failure info for this login */
1558 spin_unlock(&ls->lock);
1559 return;
1560 }
1561
1562 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1563 ls->accepts++;
1564 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1565 ls->redirects++;
1566 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1567 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1568 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1569 ls->authenticate_fails++;
1570 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1571 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1572 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1573 ls->authorize_fails++;
1574 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1575 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1576 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1577 ls->negotiate_fails++;
1578 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1579 } else {
1580 ls->other_fails++;
1581 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1582 }
1583
1584 /* Save initiator name, ip address and time, if it is a failed login */
1585 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1586 if (conn->param_list)
1587 intrname = iscsi_find_param_from_key(INITIATORNAME,
1588 conn->param_list);
1589 strcpy(ls->last_intr_fail_name,
1590 (intrname ? intrname->value : "Unknown"));
1591
1592 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1593 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1594 "%s", conn->login_ip);
1595 ls->last_fail_time = get_jiffies_64();
1596 }
1597
1598 spin_unlock(&ls->lock);
1599 }
1600
1601 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1602 {
1603 struct iscsi_portal_group *tpg;
1604
1605 if (!conn || !conn->sess)
1606 return NULL;
1607
1608 tpg = conn->sess->tpg;
1609 if (!tpg)
1610 return NULL;
1611
1612 if (!tpg->tpg_tiqn)
1613 return NULL;
1614
1615 return tpg->tpg_tiqn;
1616 }