?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
iscsi-target: Remove SCF_SE_LUN_CMD flag abuses
[linux-2.6/btrfs-unstable.git] / drivers / target / iscsi / iscsi_target_util.c
blob02348f727bd4ddaaa4ef4b70e3499fc135001dad
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_transport.h>
26 #include <target/target_core_tmr.h>
27 #include <target/target_core_fabric_ops.h>
28 #include <target/target_core_configfs.h>
29
30 #include "iscsi_target_core.h"
31 #include "iscsi_target_parameters.h"
32 #include "iscsi_target_seq_pdu_list.h"
33 #include "iscsi_target_datain_values.h"
34 #include "iscsi_target_erl0.h"
35 #include "iscsi_target_erl1.h"
36 #include "iscsi_target_erl2.h"
37 #include "iscsi_target_tpg.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_util.h"
40 #include "iscsi_target.h"
41
42 #define PRINT_BUFF(buff, len) \
43 { \
44 int zzz; \
45 \
46 pr_debug("%d:\n", __LINE__); \
47 for (zzz = 0; zzz < len; zzz++) { \
48 if (zzz % 16 == 0) { \
49 if (zzz) \
50 pr_debug("\n"); \
51 pr_debug("%4i: ", zzz); \
52 } \
53 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
54 } \
55 if ((len + 1) % 16) \
56 pr_debug("\n"); \
57 }
58
59 extern struct list_head g_tiqn_list;
60 extern spinlock_t tiqn_lock;
61
62 /*
63 * Called with cmd->r2t_lock held.
64 */
65 int iscsit_add_r2t_to_list(
66 struct iscsi_cmd *cmd,
67 u32 offset,
68 u32 xfer_len,
69 int recovery,
70 u32 r2t_sn)
71 {
72 struct iscsi_r2t *r2t;
73
74 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
75 if (!r2t) {
76 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
77 return -1;
78 }
79 INIT_LIST_HEAD(&r2t->r2t_list);
80
81 r2t->recovery_r2t = recovery;
82 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
83 r2t->offset = offset;
84 r2t->xfer_len = xfer_len;
85 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
86 spin_unlock_bh(&cmd->r2t_lock);
87
88 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
89
90 spin_lock_bh(&cmd->r2t_lock);
91 return 0;
92 }
93
94 struct iscsi_r2t *iscsit_get_r2t_for_eos(
95 struct iscsi_cmd *cmd,
96 u32 offset,
97 u32 length)
98 {
99 struct iscsi_r2t *r2t;
100
101 spin_lock_bh(&cmd->r2t_lock);
102 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
103 if ((r2t->offset <= offset) &&
104 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
105 spin_unlock_bh(&cmd->r2t_lock);
106 return r2t;
107 }
108 }
109 spin_unlock_bh(&cmd->r2t_lock);
110
111 pr_err("Unable to locate R2T for Offset: %u, Length:"
112 " %u\n", offset, length);
113 return NULL;
114 }
115
116 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
117 {
118 struct iscsi_r2t *r2t;
119
120 spin_lock_bh(&cmd->r2t_lock);
121 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
122 if (!r2t->sent_r2t) {
123 spin_unlock_bh(&cmd->r2t_lock);
124 return r2t;
125 }
126 }
127 spin_unlock_bh(&cmd->r2t_lock);
128
129 pr_err("Unable to locate next R2T to send for ITT:"
130 " 0x%08x.\n", cmd->init_task_tag);
131 return NULL;
132 }
133
134 /*
135 * Called with cmd->r2t_lock held.
136 */
137 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
138 {
139 list_del(&r2t->r2t_list);
140 kmem_cache_free(lio_r2t_cache, r2t);
141 }
142
143 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
144 {
145 struct iscsi_r2t *r2t, *r2t_tmp;
146
147 spin_lock_bh(&cmd->r2t_lock);
148 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
149 iscsit_free_r2t(r2t, cmd);
150 spin_unlock_bh(&cmd->r2t_lock);
151 }
152
153 /*
154 * May be called from software interrupt (timer) context for allocating
155 * iSCSI NopINs.
156 */
157 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
158 {
159 struct iscsi_cmd *cmd;
160
161 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
162 if (!cmd) {
163 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
164 return NULL;
165 }
166
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_list);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 init_completion(&cmd->reject_comp);
172 spin_lock_init(&cmd->datain_lock);
173 spin_lock_init(&cmd->dataout_timeout_lock);
174 spin_lock_init(&cmd->istate_lock);
175 spin_lock_init(&cmd->error_lock);
176 spin_lock_init(&cmd->r2t_lock);
177
178 return cmd;
179 }
180
181 /*
182 * Called from iscsi_handle_scsi_cmd()
183 */
184 struct iscsi_cmd *iscsit_allocate_se_cmd(
185 struct iscsi_conn *conn,
186 u32 data_length,
187 int data_direction,
188 int iscsi_task_attr)
189 {
190 struct iscsi_cmd *cmd;
191 struct se_cmd *se_cmd;
192 int sam_task_attr;
193
194 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
195 if (!cmd)
196 return NULL;
197
198 cmd->data_direction = data_direction;
199 cmd->data_length = data_length;
200 /*
201 * Figure out the SAM Task Attribute for the incoming SCSI CDB
202 */
203 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
204 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
205 sam_task_attr = MSG_SIMPLE_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
207 sam_task_attr = MSG_ORDERED_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
209 sam_task_attr = MSG_HEAD_TAG;
210 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
211 sam_task_attr = MSG_ACA_TAG;
212 else {
213 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
214 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
215 sam_task_attr = MSG_SIMPLE_TAG;
216 }
217
218 se_cmd = &cmd->se_cmd;
219 /*
220 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
221 */
222 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
223 conn->sess->se_sess, data_length, data_direction,
224 sam_task_attr, &cmd->sense_buffer[0]);
225 return cmd;
226 }
227
228 struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
229 struct iscsi_conn *conn,
230 u8 function)
231 {
232 struct iscsi_cmd *cmd;
233 struct se_cmd *se_cmd;
234 u8 tcm_function;
235
236 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
237 if (!cmd)
238 return NULL;
239
240 cmd->data_direction = DMA_NONE;
241
242 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
243 if (!cmd->tmr_req) {
244 pr_err("Unable to allocate memory for"
245 " Task Management command!\n");
246 goto out;
247 }
248 /*
249 * TASK_REASSIGN for ERL=2 / connection stays inside of
250 * LIO-Target $FABRIC_MOD
251 */
252 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
253 return cmd;
254
255 se_cmd = &cmd->se_cmd;
256 /*
257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
258 */
259 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
260 conn->sess->se_sess, 0, DMA_NONE,
261 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
262
263 switch (function) {
264 case ISCSI_TM_FUNC_ABORT_TASK:
265 tcm_function = TMR_ABORT_TASK;
266 break;
267 case ISCSI_TM_FUNC_ABORT_TASK_SET:
268 tcm_function = TMR_ABORT_TASK_SET;
269 break;
270 case ISCSI_TM_FUNC_CLEAR_ACA:
271 tcm_function = TMR_CLEAR_ACA;
272 break;
273 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
274 tcm_function = TMR_CLEAR_TASK_SET;
275 break;
276 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
277 tcm_function = TMR_LUN_RESET;
278 break;
279 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
280 tcm_function = TMR_TARGET_WARM_RESET;
281 break;
282 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
283 tcm_function = TMR_TARGET_COLD_RESET;
284 break;
285 default:
286 pr_err("Unknown iSCSI TMR Function:"
287 " 0x%02x\n", function);
288 goto out;
289 }
290
291 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
292 (void *)cmd->tmr_req, tcm_function,
293 GFP_KERNEL);
294 if (!se_cmd->se_tmr_req)
295 goto out;
296
297 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
298
299 return cmd;
300 out:
301 iscsit_release_cmd(cmd);
302 return NULL;
303 }
304
305 int iscsit_decide_list_to_build(
306 struct iscsi_cmd *cmd,
307 u32 immediate_data_length)
308 {
309 struct iscsi_build_list bl;
310 struct iscsi_conn *conn = cmd->conn;
311 struct iscsi_session *sess = conn->sess;
312 struct iscsi_node_attrib *na;
313
314 if (sess->sess_ops->DataSequenceInOrder &&
315 sess->sess_ops->DataPDUInOrder)
316 return 0;
317
318 if (cmd->data_direction == DMA_NONE)
319 return 0;
320
321 na = iscsit_tpg_get_node_attrib(sess);
322 memset(&bl, 0, sizeof(struct iscsi_build_list));
323
324 if (cmd->data_direction == DMA_FROM_DEVICE) {
325 bl.data_direction = ISCSI_PDU_READ;
326 bl.type = PDULIST_NORMAL;
327 if (na->random_datain_pdu_offsets)
328 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
329 if (na->random_datain_seq_offsets)
330 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
331 } else {
332 bl.data_direction = ISCSI_PDU_WRITE;
333 bl.immediate_data_length = immediate_data_length;
334 if (na->random_r2t_offsets)
335 bl.randomize |= RANDOM_R2T_OFFSETS;
336
337 if (!cmd->immediate_data && !cmd->unsolicited_data)
338 bl.type = PDULIST_NORMAL;
339 else if (cmd->immediate_data && !cmd->unsolicited_data)
340 bl.type = PDULIST_IMMEDIATE;
341 else if (!cmd->immediate_data && cmd->unsolicited_data)
342 bl.type = PDULIST_UNSOLICITED;
343 else if (cmd->immediate_data && cmd->unsolicited_data)
344 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
345 }
346
347 return iscsit_do_build_list(cmd, &bl);
348 }
349
350 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
351 struct iscsi_cmd *cmd,
352 u32 seq_send_order)
353 {
354 u32 i;
355
356 for (i = 0; i < cmd->seq_count; i++)
357 if (cmd->seq_list[i].seq_send_order == seq_send_order)
358 return &cmd->seq_list[i];
359
360 return NULL;
361 }
362
363 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
364 {
365 u32 i;
366
367 if (!cmd->seq_list) {
368 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
369 return NULL;
370 }
371
372 for (i = 0; i < cmd->seq_count; i++) {
373 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
374 continue;
375 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
376 cmd->seq_send_order++;
377 return &cmd->seq_list[i];
378 }
379 }
380
381 return NULL;
382 }
383
384 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
385 struct iscsi_cmd *cmd,
386 u32 r2t_sn)
387 {
388 struct iscsi_r2t *r2t;
389
390 spin_lock_bh(&cmd->r2t_lock);
391 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
392 if (r2t->r2t_sn == r2t_sn) {
393 spin_unlock_bh(&cmd->r2t_lock);
394 return r2t;
395 }
396 }
397 spin_unlock_bh(&cmd->r2t_lock);
398
399 return NULL;
400 }
401
402 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
403 {
404 int ret;
405
406 /*
407 * This is the proper method of checking received CmdSN against
408 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
409 * or order CmdSNs due to multiple connection sessions and/or
410 * CRC failures.
411 */
412 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
413 pr_err("Received CmdSN: 0x%08x is greater than"
414 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
415 sess->max_cmd_sn);
416 ret = CMDSN_ERROR_CANNOT_RECOVER;
417
418 } else if (cmdsn == sess->exp_cmd_sn) {
419 sess->exp_cmd_sn++;
420 pr_debug("Received CmdSN matches ExpCmdSN,"
421 " incremented ExpCmdSN to: 0x%08x\n",
422 sess->exp_cmd_sn);
423 ret = CMDSN_NORMAL_OPERATION;
424
425 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
426 pr_debug("Received CmdSN: 0x%08x is greater"
427 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
428 cmdsn, sess->exp_cmd_sn);
429 ret = CMDSN_HIGHER_THAN_EXP;
430
431 } else {
432 pr_err("Received CmdSN: 0x%08x is less than"
433 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
434 sess->exp_cmd_sn);
435 ret = CMDSN_LOWER_THAN_EXP;
436 }
437
438 return ret;
439 }
440
441 /*
442 * Commands may be received out of order if MC/S is in use.
443 * Ensure they are executed in CmdSN order.
444 */
445 int iscsit_sequence_cmd(
446 struct iscsi_conn *conn,
447 struct iscsi_cmd *cmd,
448 u32 cmdsn)
449 {
450 int ret;
451 int cmdsn_ret;
452
453 mutex_lock(&conn->sess->cmdsn_mutex);
454
455 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
456 switch (cmdsn_ret) {
457 case CMDSN_NORMAL_OPERATION:
458 ret = iscsit_execute_cmd(cmd, 0);
459 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
460 iscsit_execute_ooo_cmdsns(conn->sess);
461 break;
462 case CMDSN_HIGHER_THAN_EXP:
463 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
464 break;
465 case CMDSN_LOWER_THAN_EXP:
466 cmd->i_state = ISTATE_REMOVE;
467 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
468 ret = cmdsn_ret;
469 break;
470 default:
471 ret = cmdsn_ret;
472 break;
473 }
474 mutex_unlock(&conn->sess->cmdsn_mutex);
475
476 return ret;
477 }
478
479 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
480 {
481 struct iscsi_conn *conn = cmd->conn;
482 struct se_cmd *se_cmd = &cmd->se_cmd;
483 struct iscsi_data *hdr = (struct iscsi_data *) buf;
484 u32 payload_length = ntoh24(hdr->dlength);
485
486 if (conn->sess->sess_ops->InitialR2T) {
487 pr_err("Received unexpected unsolicited data"
488 " while InitialR2T=Yes, protocol error.\n");
489 transport_send_check_condition_and_sense(se_cmd,
490 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
491 return -1;
492 }
493
494 if ((cmd->first_burst_len + payload_length) >
495 conn->sess->sess_ops->FirstBurstLength) {
496 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
497 " for this Unsolicited DataOut Burst.\n",
498 (cmd->first_burst_len + payload_length),
499 conn->sess->sess_ops->FirstBurstLength);
500 transport_send_check_condition_and_sense(se_cmd,
501 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
502 return -1;
503 }
504
505 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
506 return 0;
507
508 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
509 ((cmd->first_burst_len + payload_length) !=
510 conn->sess->sess_ops->FirstBurstLength)) {
511 pr_err("Unsolicited non-immediate data received %u"
512 " does not equal FirstBurstLength: %u, and does"
513 " not equal ExpXferLen %u.\n",
514 (cmd->first_burst_len + payload_length),
515 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
516 transport_send_check_condition_and_sense(se_cmd,
517 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
518 return -1;
519 }
520 return 0;
521 }
522
523 struct iscsi_cmd *iscsit_find_cmd_from_itt(
524 struct iscsi_conn *conn,
525 u32 init_task_tag)
526 {
527 struct iscsi_cmd *cmd;
528
529 spin_lock_bh(&conn->cmd_lock);
530 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
531 if (cmd->init_task_tag == init_task_tag) {
532 spin_unlock_bh(&conn->cmd_lock);
533 return cmd;
534 }
535 }
536 spin_unlock_bh(&conn->cmd_lock);
537
538 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
539 init_task_tag, conn->cid);
540 return NULL;
541 }
542
543 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
544 struct iscsi_conn *conn,
545 u32 init_task_tag,
546 u32 length)
547 {
548 struct iscsi_cmd *cmd;
549
550 spin_lock_bh(&conn->cmd_lock);
551 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
552 if (cmd->init_task_tag == init_task_tag) {
553 spin_unlock_bh(&conn->cmd_lock);
554 return cmd;
555 }
556 }
557 spin_unlock_bh(&conn->cmd_lock);
558
559 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
560 " dumping payload\n", init_task_tag, conn->cid);
561 if (length)
562 iscsit_dump_data_payload(conn, length, 1);
563
564 return NULL;
565 }
566
567 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
568 struct iscsi_conn *conn,
569 u32 targ_xfer_tag)
570 {
571 struct iscsi_cmd *cmd = NULL;
572
573 spin_lock_bh(&conn->cmd_lock);
574 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
575 if (cmd->targ_xfer_tag == targ_xfer_tag) {
576 spin_unlock_bh(&conn->cmd_lock);
577 return cmd;
578 }
579 }
580 spin_unlock_bh(&conn->cmd_lock);
581
582 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
583 targ_xfer_tag, conn->cid);
584 return NULL;
585 }
586
587 int iscsit_find_cmd_for_recovery(
588 struct iscsi_session *sess,
589 struct iscsi_cmd **cmd_ptr,
590 struct iscsi_conn_recovery **cr_ptr,
591 u32 init_task_tag)
592 {
593 struct iscsi_cmd *cmd = NULL;
594 struct iscsi_conn_recovery *cr;
595 /*
596 * Scan through the inactive connection recovery list's command list.
597 * If init_task_tag matches the command is still alligent.
598 */
599 spin_lock(&sess->cr_i_lock);
600 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
601 spin_lock(&cr->conn_recovery_cmd_lock);
602 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
603 if (cmd->init_task_tag == init_task_tag) {
604 spin_unlock(&cr->conn_recovery_cmd_lock);
605 spin_unlock(&sess->cr_i_lock);
606
607 *cr_ptr = cr;
608 *cmd_ptr = cmd;
609 return -2;
610 }
611 }
612 spin_unlock(&cr->conn_recovery_cmd_lock);
613 }
614 spin_unlock(&sess->cr_i_lock);
615 /*
616 * Scan through the active connection recovery list's command list.
617 * If init_task_tag matches the command is ready to be reassigned.
618 */
619 spin_lock(&sess->cr_a_lock);
620 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
621 spin_lock(&cr->conn_recovery_cmd_lock);
622 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
623 if (cmd->init_task_tag == init_task_tag) {
624 spin_unlock(&cr->conn_recovery_cmd_lock);
625 spin_unlock(&sess->cr_a_lock);
626
627 *cr_ptr = cr;
628 *cmd_ptr = cmd;
629 return 0;
630 }
631 }
632 spin_unlock(&cr->conn_recovery_cmd_lock);
633 }
634 spin_unlock(&sess->cr_a_lock);
635
636 return -1;
637 }
638
639 void iscsit_add_cmd_to_immediate_queue(
640 struct iscsi_cmd *cmd,
641 struct iscsi_conn *conn,
642 u8 state)
643 {
644 struct iscsi_queue_req *qr;
645
646 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
647 if (!qr) {
648 pr_err("Unable to allocate memory for"
649 " struct iscsi_queue_req\n");
650 return;
651 }
652 INIT_LIST_HEAD(&qr->qr_list);
653 qr->cmd = cmd;
654 qr->state = state;
655
656 spin_lock_bh(&conn->immed_queue_lock);
657 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
658 atomic_inc(&cmd->immed_queue_count);
659 atomic_set(&conn->check_immediate_queue, 1);
660 spin_unlock_bh(&conn->immed_queue_lock);
661
662 wake_up_process(conn->thread_set->tx_thread);
663 }
664
665 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
666 {
667 struct iscsi_queue_req *qr;
668
669 spin_lock_bh(&conn->immed_queue_lock);
670 if (list_empty(&conn->immed_queue_list)) {
671 spin_unlock_bh(&conn->immed_queue_lock);
672 return NULL;
673 }
674 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
675 break;
676
677 list_del(&qr->qr_list);
678 if (qr->cmd)
679 atomic_dec(&qr->cmd->immed_queue_count);
680 spin_unlock_bh(&conn->immed_queue_lock);
681
682 return qr;
683 }
684
685 static void iscsit_remove_cmd_from_immediate_queue(
686 struct iscsi_cmd *cmd,
687 struct iscsi_conn *conn)
688 {
689 struct iscsi_queue_req *qr, *qr_tmp;
690
691 spin_lock_bh(&conn->immed_queue_lock);
692 if (!atomic_read(&cmd->immed_queue_count)) {
693 spin_unlock_bh(&conn->immed_queue_lock);
694 return;
695 }
696
697 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
698 if (qr->cmd != cmd)
699 continue;
700
701 atomic_dec(&qr->cmd->immed_queue_count);
702 list_del(&qr->qr_list);
703 kmem_cache_free(lio_qr_cache, qr);
704 }
705 spin_unlock_bh(&conn->immed_queue_lock);
706
707 if (atomic_read(&cmd->immed_queue_count)) {
708 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
709 cmd->init_task_tag,
710 atomic_read(&cmd->immed_queue_count));
711 }
712 }
713
714 void iscsit_add_cmd_to_response_queue(
715 struct iscsi_cmd *cmd,
716 struct iscsi_conn *conn,
717 u8 state)
718 {
719 struct iscsi_queue_req *qr;
720
721 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
722 if (!qr) {
723 pr_err("Unable to allocate memory for"
724 " struct iscsi_queue_req\n");
725 return;
726 }
727 INIT_LIST_HEAD(&qr->qr_list);
728 qr->cmd = cmd;
729 qr->state = state;
730
731 spin_lock_bh(&conn->response_queue_lock);
732 list_add_tail(&qr->qr_list, &conn->response_queue_list);
733 atomic_inc(&cmd->response_queue_count);
734 spin_unlock_bh(&conn->response_queue_lock);
735
736 wake_up_process(conn->thread_set->tx_thread);
737 }
738
739 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
740 {
741 struct iscsi_queue_req *qr;
742
743 spin_lock_bh(&conn->response_queue_lock);
744 if (list_empty(&conn->response_queue_list)) {
745 spin_unlock_bh(&conn->response_queue_lock);
746 return NULL;
747 }
748
749 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
750 break;
751
752 list_del(&qr->qr_list);
753 if (qr->cmd)
754 atomic_dec(&qr->cmd->response_queue_count);
755 spin_unlock_bh(&conn->response_queue_lock);
756
757 return qr;
758 }
759
760 static void iscsit_remove_cmd_from_response_queue(
761 struct iscsi_cmd *cmd,
762 struct iscsi_conn *conn)
763 {
764 struct iscsi_queue_req *qr, *qr_tmp;
765
766 spin_lock_bh(&conn->response_queue_lock);
767 if (!atomic_read(&cmd->response_queue_count)) {
768 spin_unlock_bh(&conn->response_queue_lock);
769 return;
770 }
771
772 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
773 qr_list) {
774 if (qr->cmd != cmd)
775 continue;
776
777 atomic_dec(&qr->cmd->response_queue_count);
778 list_del(&qr->qr_list);
779 kmem_cache_free(lio_qr_cache, qr);
780 }
781 spin_unlock_bh(&conn->response_queue_lock);
782
783 if (atomic_read(&cmd->response_queue_count)) {
784 pr_err("ITT: 0x%08x response_queue_count: %d\n",
785 cmd->init_task_tag,
786 atomic_read(&cmd->response_queue_count));
787 }
788 }
789
790 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
791 {
792 struct iscsi_queue_req *qr, *qr_tmp;
793
794 spin_lock_bh(&conn->immed_queue_lock);
795 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
796 list_del(&qr->qr_list);
797 if (qr->cmd)
798 atomic_dec(&qr->cmd->immed_queue_count);
799
800 kmem_cache_free(lio_qr_cache, qr);
801 }
802 spin_unlock_bh(&conn->immed_queue_lock);
803
804 spin_lock_bh(&conn->response_queue_lock);
805 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
806 qr_list) {
807 list_del(&qr->qr_list);
808 if (qr->cmd)
809 atomic_dec(&qr->cmd->response_queue_count);
810
811 kmem_cache_free(lio_qr_cache, qr);
812 }
813 spin_unlock_bh(&conn->response_queue_lock);
814 }
815
816 void iscsit_release_cmd(struct iscsi_cmd *cmd)
817 {
818 struct iscsi_conn *conn = cmd->conn;
819 int i;
820
821 iscsit_free_r2ts_from_list(cmd);
822 iscsit_free_all_datain_reqs(cmd);
823
824 kfree(cmd->buf_ptr);
825 kfree(cmd->pdu_list);
826 kfree(cmd->seq_list);
827 kfree(cmd->tmr_req);
828 kfree(cmd->iov_data);
829
830 for (i = 0; i < cmd->t_mem_sg_nents; i++)
831 __free_page(sg_page(&cmd->t_mem_sg[i]));
832
833 kfree(cmd->t_mem_sg);
834
835 if (conn) {
836 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
837 iscsit_remove_cmd_from_response_queue(cmd, conn);
838 }
839
840 kmem_cache_free(lio_cmd_cache, cmd);
841 }
842
843 void iscsit_free_cmd(struct iscsi_cmd *cmd)
844 {
845 /*
846 * Determine if a struct se_cmd is assoicated with
847 * this struct iscsi_cmd.
848 */
849 switch (cmd->iscsi_opcode) {
850 case ISCSI_OP_SCSI_CMD:
851 case ISCSI_OP_SCSI_TMFUNC:
852 transport_generic_free_cmd(&cmd->se_cmd, 1);
853 break;
854 default:
855 iscsit_release_cmd(cmd);
856 break;
857 }
858 }
859
860 int iscsit_check_session_usage_count(struct iscsi_session *sess)
861 {
862 spin_lock_bh(&sess->session_usage_lock);
863 if (sess->session_usage_count != 0) {
864 sess->session_waiting_on_uc = 1;
865 spin_unlock_bh(&sess->session_usage_lock);
866 if (in_interrupt())
867 return 2;
868
869 wait_for_completion(&sess->session_waiting_on_uc_comp);
870 return 1;
871 }
872 spin_unlock_bh(&sess->session_usage_lock);
873
874 return 0;
875 }
876
877 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
878 {
879 spin_lock_bh(&sess->session_usage_lock);
880 sess->session_usage_count--;
881
882 if (!sess->session_usage_count && sess->session_waiting_on_uc)
883 complete(&sess->session_waiting_on_uc_comp);
884
885 spin_unlock_bh(&sess->session_usage_lock);
886 }
887
888 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
889 {
890 spin_lock_bh(&sess->session_usage_lock);
891 sess->session_usage_count++;
892 spin_unlock_bh(&sess->session_usage_lock);
893 }
894
895 /*
896 * Setup conn->if_marker and conn->of_marker values based upon
897 * the initial marker-less interval. (see iSCSI v19 A.2)
898 */
899 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
900 {
901 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
902 /*
903 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
904 */
905 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
906 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
907
908 if (conn->conn_ops->OFMarker) {
909 /*
910 * Account for the first Login Command received not
911 * via iscsi_recv_msg().
912 */
913 conn->of_marker += ISCSI_HDR_LEN;
914 if (conn->of_marker <= OFMarkInt) {
915 conn->of_marker = (OFMarkInt - conn->of_marker);
916 } else {
917 login_ofmarker_count = (conn->of_marker / OFMarkInt);
918 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
919 (login_ofmarker_count * MARKER_SIZE);
920 conn->of_marker = (next_marker - conn->of_marker);
921 }
922 conn->of_marker_offset = 0;
923 pr_debug("Setting OFMarker value to %u based on Initial"
924 " Markerless Interval.\n", conn->of_marker);
925 }
926
927 if (conn->conn_ops->IFMarker) {
928 if (conn->if_marker <= IFMarkInt) {
929 conn->if_marker = (IFMarkInt - conn->if_marker);
930 } else {
931 login_ifmarker_count = (conn->if_marker / IFMarkInt);
932 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
933 (login_ifmarker_count * MARKER_SIZE);
934 conn->if_marker = (next_marker - conn->if_marker);
935 }
936 pr_debug("Setting IFMarker value to %u based on Initial"
937 " Markerless Interval.\n", conn->if_marker);
938 }
939
940 return 0;
941 }
942
943 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
944 {
945 struct iscsi_conn *conn;
946
947 spin_lock_bh(&sess->conn_lock);
948 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
949 if ((conn->cid == cid) &&
950 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
951 iscsit_inc_conn_usage_count(conn);
952 spin_unlock_bh(&sess->conn_lock);
953 return conn;
954 }
955 }
956 spin_unlock_bh(&sess->conn_lock);
957
958 return NULL;
959 }
960
961 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
962 {
963 struct iscsi_conn *conn;
964
965 spin_lock_bh(&sess->conn_lock);
966 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
967 if (conn->cid == cid) {
968 iscsit_inc_conn_usage_count(conn);
969 spin_lock(&conn->state_lock);
970 atomic_set(&conn->connection_wait_rcfr, 1);
971 spin_unlock(&conn->state_lock);
972 spin_unlock_bh(&sess->conn_lock);
973 return conn;
974 }
975 }
976 spin_unlock_bh(&sess->conn_lock);
977
978 return NULL;
979 }
980
981 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
982 {
983 spin_lock_bh(&conn->conn_usage_lock);
984 if (conn->conn_usage_count != 0) {
985 conn->conn_waiting_on_uc = 1;
986 spin_unlock_bh(&conn->conn_usage_lock);
987
988 wait_for_completion(&conn->conn_waiting_on_uc_comp);
989 return;
990 }
991 spin_unlock_bh(&conn->conn_usage_lock);
992 }
993
994 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
995 {
996 spin_lock_bh(&conn->conn_usage_lock);
997 conn->conn_usage_count--;
998
999 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
1000 complete(&conn->conn_waiting_on_uc_comp);
1001
1002 spin_unlock_bh(&conn->conn_usage_lock);
1003 }
1004
1005 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1006 {
1007 spin_lock_bh(&conn->conn_usage_lock);
1008 conn->conn_usage_count++;
1009 spin_unlock_bh(&conn->conn_usage_lock);
1010 }
1011
1012 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1013 {
1014 u8 state;
1015 struct iscsi_cmd *cmd;
1016
1017 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1018 if (!cmd)
1019 return -1;
1020
1021 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1022 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1023 ISTATE_SEND_NOPIN_NO_RESPONSE;
1024 cmd->init_task_tag = 0xFFFFFFFF;
1025 spin_lock_bh(&conn->sess->ttt_lock);
1026 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1027 0xFFFFFFFF;
1028 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1029 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1030 spin_unlock_bh(&conn->sess->ttt_lock);
1031
1032 spin_lock_bh(&conn->cmd_lock);
1033 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1034 spin_unlock_bh(&conn->cmd_lock);
1035
1036 if (want_response)
1037 iscsit_start_nopin_response_timer(conn);
1038 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1039
1040 return 0;
1041 }
1042
1043 static void iscsit_handle_nopin_response_timeout(unsigned long data)
1044 {
1045 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1046
1047 iscsit_inc_conn_usage_count(conn);
1048
1049 spin_lock_bh(&conn->nopin_timer_lock);
1050 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1051 spin_unlock_bh(&conn->nopin_timer_lock);
1052 iscsit_dec_conn_usage_count(conn);
1053 return;
1054 }
1055
1056 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1057 " SID: %u, failing connection.\n", conn->cid,
1058 conn->sess->sid);
1059 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1060 spin_unlock_bh(&conn->nopin_timer_lock);
1061
1062 {
1063 struct iscsi_portal_group *tpg = conn->sess->tpg;
1064 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1065
1066 if (tiqn) {
1067 spin_lock_bh(&tiqn->sess_err_stats.lock);
1068 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1069 (void *)conn->sess->sess_ops->InitiatorName);
1070 tiqn->sess_err_stats.last_sess_failure_type =
1071 ISCSI_SESS_ERR_CXN_TIMEOUT;
1072 tiqn->sess_err_stats.cxn_timeout_errors++;
1073 conn->sess->conn_timeout_errors++;
1074 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1075 }
1076 }
1077
1078 iscsit_cause_connection_reinstatement(conn, 0);
1079 iscsit_dec_conn_usage_count(conn);
1080 }
1081
1082 void iscsit_mod_nopin_response_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 spin_lock_bh(&conn->nopin_timer_lock);
1088 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1089 spin_unlock_bh(&conn->nopin_timer_lock);
1090 return;
1091 }
1092
1093 mod_timer(&conn->nopin_response_timer,
1094 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1095 spin_unlock_bh(&conn->nopin_timer_lock);
1096 }
1097
1098 /*
1099 * Called with conn->nopin_timer_lock held.
1100 */
1101 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1102 {
1103 struct iscsi_session *sess = conn->sess;
1104 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1105
1106 spin_lock_bh(&conn->nopin_timer_lock);
1107 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1108 spin_unlock_bh(&conn->nopin_timer_lock);
1109 return;
1110 }
1111
1112 init_timer(&conn->nopin_response_timer);
1113 conn->nopin_response_timer.expires =
1114 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1115 conn->nopin_response_timer.data = (unsigned long)conn;
1116 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1117 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1118 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1119 add_timer(&conn->nopin_response_timer);
1120
1121 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1122 " seconds\n", conn->cid, na->nopin_response_timeout);
1123 spin_unlock_bh(&conn->nopin_timer_lock);
1124 }
1125
1126 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1127 {
1128 spin_lock_bh(&conn->nopin_timer_lock);
1129 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1130 spin_unlock_bh(&conn->nopin_timer_lock);
1131 return;
1132 }
1133 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1134 spin_unlock_bh(&conn->nopin_timer_lock);
1135
1136 del_timer_sync(&conn->nopin_response_timer);
1137
1138 spin_lock_bh(&conn->nopin_timer_lock);
1139 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1140 spin_unlock_bh(&conn->nopin_timer_lock);
1141 }
1142
1143 static void iscsit_handle_nopin_timeout(unsigned long data)
1144 {
1145 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1146
1147 iscsit_inc_conn_usage_count(conn);
1148
1149 spin_lock_bh(&conn->nopin_timer_lock);
1150 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1151 spin_unlock_bh(&conn->nopin_timer_lock);
1152 iscsit_dec_conn_usage_count(conn);
1153 return;
1154 }
1155 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1156 spin_unlock_bh(&conn->nopin_timer_lock);
1157
1158 iscsit_add_nopin(conn, 1);
1159 iscsit_dec_conn_usage_count(conn);
1160 }
1161
1162 /*
1163 * Called with conn->nopin_timer_lock held.
1164 */
1165 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1166 {
1167 struct iscsi_session *sess = conn->sess;
1168 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1169 /*
1170 * NOPIN timeout is disabled.
1171 */
1172 if (!na->nopin_timeout)
1173 return;
1174
1175 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1176 return;
1177
1178 init_timer(&conn->nopin_timer);
1179 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1180 conn->nopin_timer.data = (unsigned long)conn;
1181 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1182 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1183 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1184 add_timer(&conn->nopin_timer);
1185
1186 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1187 " interval\n", conn->cid, na->nopin_timeout);
1188 }
1189
1190 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1191 {
1192 struct iscsi_session *sess = conn->sess;
1193 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1194 /*
1195 * NOPIN timeout is disabled..
1196 */
1197 if (!na->nopin_timeout)
1198 return;
1199
1200 spin_lock_bh(&conn->nopin_timer_lock);
1201 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1202 spin_unlock_bh(&conn->nopin_timer_lock);
1203 return;
1204 }
1205
1206 init_timer(&conn->nopin_timer);
1207 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1208 conn->nopin_timer.data = (unsigned long)conn;
1209 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1210 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1211 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1212 add_timer(&conn->nopin_timer);
1213
1214 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1215 " interval\n", conn->cid, na->nopin_timeout);
1216 spin_unlock_bh(&conn->nopin_timer_lock);
1217 }
1218
1219 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1220 {
1221 spin_lock_bh(&conn->nopin_timer_lock);
1222 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1223 spin_unlock_bh(&conn->nopin_timer_lock);
1224 return;
1225 }
1226 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1227 spin_unlock_bh(&conn->nopin_timer_lock);
1228
1229 del_timer_sync(&conn->nopin_timer);
1230
1231 spin_lock_bh(&conn->nopin_timer_lock);
1232 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1233 spin_unlock_bh(&conn->nopin_timer_lock);
1234 }
1235
1236 int iscsit_send_tx_data(
1237 struct iscsi_cmd *cmd,
1238 struct iscsi_conn *conn,
1239 int use_misc)
1240 {
1241 int tx_sent, tx_size;
1242 u32 iov_count;
1243 struct kvec *iov;
1244
1245 send_data:
1246 tx_size = cmd->tx_size;
1247
1248 if (!use_misc) {
1249 iov = &cmd->iov_data[0];
1250 iov_count = cmd->iov_data_count;
1251 } else {
1252 iov = &cmd->iov_misc[0];
1253 iov_count = cmd->iov_misc_count;
1254 }
1255
1256 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1257 if (tx_size != tx_sent) {
1258 if (tx_sent == -EAGAIN) {
1259 pr_err("tx_data() returned -EAGAIN\n");
1260 goto send_data;
1261 } else
1262 return -1;
1263 }
1264 cmd->tx_size = 0;
1265
1266 return 0;
1267 }
1268
1269 int iscsit_fe_sendpage_sg(
1270 struct iscsi_cmd *cmd,
1271 struct iscsi_conn *conn)
1272 {
1273 struct scatterlist *sg = cmd->first_data_sg;
1274 struct kvec iov;
1275 u32 tx_hdr_size, data_len;
1276 u32 offset = cmd->first_data_sg_off;
1277 int tx_sent, iov_off;
1278
1279 send_hdr:
1280 tx_hdr_size = ISCSI_HDR_LEN;
1281 if (conn->conn_ops->HeaderDigest)
1282 tx_hdr_size += ISCSI_CRC_LEN;
1283
1284 iov.iov_base = cmd->pdu;
1285 iov.iov_len = tx_hdr_size;
1286
1287 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1288 if (tx_hdr_size != tx_sent) {
1289 if (tx_sent == -EAGAIN) {
1290 pr_err("tx_data() returned -EAGAIN\n");
1291 goto send_hdr;
1292 }
1293 return -1;
1294 }
1295
1296 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1297 /*
1298 * Set iov_off used by padding and data digest tx_data() calls below
1299 * in order to determine proper offset into cmd->iov_data[]
1300 */
1301 if (conn->conn_ops->DataDigest) {
1302 data_len -= ISCSI_CRC_LEN;
1303 if (cmd->padding)
1304 iov_off = (cmd->iov_data_count - 2);
1305 else
1306 iov_off = (cmd->iov_data_count - 1);
1307 } else {
1308 iov_off = (cmd->iov_data_count - 1);
1309 }
1310 /*
1311 * Perform sendpage() for each page in the scatterlist
1312 */
1313 while (data_len) {
1314 u32 space = (sg->length - offset);
1315 u32 sub_len = min_t(u32, data_len, space);
1316 send_pg:
1317 tx_sent = conn->sock->ops->sendpage(conn->sock,
1318 sg_page(sg), sg->offset + offset, sub_len, 0);
1319 if (tx_sent != sub_len) {
1320 if (tx_sent == -EAGAIN) {
1321 pr_err("tcp_sendpage() returned"
1322 " -EAGAIN\n");
1323 goto send_pg;
1324 }
1325
1326 pr_err("tcp_sendpage() failure: %d\n",
1327 tx_sent);
1328 return -1;
1329 }
1330
1331 data_len -= sub_len;
1332 offset = 0;
1333 sg = sg_next(sg);
1334 }
1335
1336 send_padding:
1337 if (cmd->padding) {
1338 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1339
1340 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1341 if (cmd->padding != tx_sent) {
1342 if (tx_sent == -EAGAIN) {
1343 pr_err("tx_data() returned -EAGAIN\n");
1344 goto send_padding;
1345 }
1346 return -1;
1347 }
1348 }
1349
1350 send_datacrc:
1351 if (conn->conn_ops->DataDigest) {
1352 struct kvec *iov_d = &cmd->iov_data[iov_off];
1353
1354 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1355 if (ISCSI_CRC_LEN != tx_sent) {
1356 if (tx_sent == -EAGAIN) {
1357 pr_err("tx_data() returned -EAGAIN\n");
1358 goto send_datacrc;
1359 }
1360 return -1;
1361 }
1362 }
1363
1364 return 0;
1365 }
1366
1367 /*
1368 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1369 * back to the Initiator when an expection condition occurs with the
1370 * errors set in status_class and status_detail.
1371 *
1372 * Parameters: iSCSI Connection, Status Class, Status Detail.
1373 * Returns: 0 on success, -1 on error.
1374 */
1375 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1376 {
1377 u8 iscsi_hdr[ISCSI_HDR_LEN];
1378 int err;
1379 struct kvec iov;
1380 struct iscsi_login_rsp *hdr;
1381
1382 iscsit_collect_login_stats(conn, status_class, status_detail);
1383
1384 memset(&iov, 0, sizeof(struct kvec));
1385 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1386
1387 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1388 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1389 hdr->status_class = status_class;
1390 hdr->status_detail = status_detail;
1391 hdr->itt = cpu_to_be32(conn->login_itt);
1392
1393 iov.iov_base = &iscsi_hdr;
1394 iov.iov_len = ISCSI_HDR_LEN;
1395
1396 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1397
1398 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1399 if (err != ISCSI_HDR_LEN) {
1400 pr_err("tx_data returned less than expected\n");
1401 return -1;
1402 }
1403
1404 return 0;
1405 }
1406
1407 void iscsit_print_session_params(struct iscsi_session *sess)
1408 {
1409 struct iscsi_conn *conn;
1410
1411 pr_debug("-----------------------------[Session Params for"
1412 " SID: %u]-----------------------------\n", sess->sid);
1413 spin_lock_bh(&sess->conn_lock);
1414 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1415 iscsi_dump_conn_ops(conn->conn_ops);
1416 spin_unlock_bh(&sess->conn_lock);
1417
1418 iscsi_dump_sess_ops(sess->sess_ops);
1419 }
1420
1421 static int iscsit_do_rx_data(
1422 struct iscsi_conn *conn,
1423 struct iscsi_data_count *count)
1424 {
1425 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1426 struct kvec *iov_p;
1427 struct msghdr msg;
1428
1429 if (!conn || !conn->sock || !conn->conn_ops)
1430 return -1;
1431
1432 memset(&msg, 0, sizeof(struct msghdr));
1433
1434 iov_p = count->iov;
1435 iov_len = count->iov_count;
1436
1437 while (total_rx < data) {
1438 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1439 (data - total_rx), MSG_WAITALL);
1440 if (rx_loop <= 0) {
1441 pr_debug("rx_loop: %d total_rx: %d\n",
1442 rx_loop, total_rx);
1443 return rx_loop;
1444 }
1445 total_rx += rx_loop;
1446 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1447 rx_loop, total_rx, data);
1448 }
1449
1450 return total_rx;
1451 }
1452
1453 static int iscsit_do_tx_data(
1454 struct iscsi_conn *conn,
1455 struct iscsi_data_count *count)
1456 {
1457 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1458 struct kvec *iov_p;
1459 struct msghdr msg;
1460
1461 if (!conn || !conn->sock || !conn->conn_ops)
1462 return -1;
1463
1464 if (data <= 0) {
1465 pr_err("Data length is: %d\n", data);
1466 return -1;
1467 }
1468
1469 memset(&msg, 0, sizeof(struct msghdr));
1470
1471 iov_p = count->iov;
1472 iov_len = count->iov_count;
1473
1474 while (total_tx < data) {
1475 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1476 (data - total_tx));
1477 if (tx_loop <= 0) {
1478 pr_debug("tx_loop: %d total_tx %d\n",
1479 tx_loop, total_tx);
1480 return tx_loop;
1481 }
1482 total_tx += tx_loop;
1483 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1484 tx_loop, total_tx, data);
1485 }
1486
1487 return total_tx;
1488 }
1489
1490 int rx_data(
1491 struct iscsi_conn *conn,
1492 struct kvec *iov,
1493 int iov_count,
1494 int data)
1495 {
1496 struct iscsi_data_count c;
1497
1498 if (!conn || !conn->sock || !conn->conn_ops)
1499 return -1;
1500
1501 memset(&c, 0, sizeof(struct iscsi_data_count));
1502 c.iov = iov;
1503 c.iov_count = iov_count;
1504 c.data_length = data;
1505 c.type = ISCSI_RX_DATA;
1506
1507 return iscsit_do_rx_data(conn, &c);
1508 }
1509
1510 int tx_data(
1511 struct iscsi_conn *conn,
1512 struct kvec *iov,
1513 int iov_count,
1514 int data)
1515 {
1516 struct iscsi_data_count c;
1517
1518 if (!conn || !conn->sock || !conn->conn_ops)
1519 return -1;
1520
1521 memset(&c, 0, sizeof(struct iscsi_data_count));
1522 c.iov = iov;
1523 c.iov_count = iov_count;
1524 c.data_length = data;
1525 c.type = ISCSI_TX_DATA;
1526
1527 return iscsit_do_tx_data(conn, &c);
1528 }
1529
1530 void iscsit_collect_login_stats(
1531 struct iscsi_conn *conn,
1532 u8 status_class,
1533 u8 status_detail)
1534 {
1535 struct iscsi_param *intrname = NULL;
1536 struct iscsi_tiqn *tiqn;
1537 struct iscsi_login_stats *ls;
1538
1539 tiqn = iscsit_snmp_get_tiqn(conn);
1540 if (!tiqn)
1541 return;
1542
1543 ls = &tiqn->login_stats;
1544
1545 spin_lock(&ls->lock);
1546 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1547 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1548 /* We already have the failure info for this login */
1549 spin_unlock(&ls->lock);
1550 return;
1551 }
1552
1553 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1554 ls->accepts++;
1555 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1556 ls->redirects++;
1557 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1558 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1559 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1560 ls->authenticate_fails++;
1561 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1562 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1563 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1564 ls->authorize_fails++;
1565 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1566 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1567 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1568 ls->negotiate_fails++;
1569 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1570 } else {
1571 ls->other_fails++;
1572 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1573 }
1574
1575 /* Save initiator name, ip address and time, if it is a failed login */
1576 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1577 if (conn->param_list)
1578 intrname = iscsi_find_param_from_key(INITIATORNAME,
1579 conn->param_list);
1580 strcpy(ls->last_intr_fail_name,
1581 (intrname ? intrname->value : "Unknown"));
1582
1583 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1584 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1585 "%s", conn->login_ip);
1586 ls->last_fail_time = get_jiffies_64();
1587 }
1588
1589 spin_unlock(&ls->lock);
1590 }
1591
1592 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1593 {
1594 struct iscsi_portal_group *tpg;
1595
1596 if (!conn || !conn->sess)
1597 return NULL;
1598
1599 tpg = conn->sess->tpg;
1600 if (!tpg)
1601 return NULL;
1602
1603 if (!tpg->tpg_tiqn)
1604 return NULL;
1605
1606 return tpg->tpg_tiqn;
1607 }
(deprecated) Btrfs devel tree