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target: Have core_tmr_alloc_req() take an explicit GFP_xxx flag
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target_util.c
1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/list.h>
22 #include <scsi/scsi_tcq.h>
23 #include <scsi/iscsi_proto.h>
24 #include <target/target_core_base.h>
25 #include <target/target_core_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 int iscsit_check_session_usage_count(struct iscsi_session *sess)
844 {
845 spin_lock_bh(&sess->session_usage_lock);
846 if (sess->session_usage_count != 0) {
847 sess->session_waiting_on_uc = 1;
848 spin_unlock_bh(&sess->session_usage_lock);
849 if (in_interrupt())
850 return 2;
851
852 wait_for_completion(&sess->session_waiting_on_uc_comp);
853 return 1;
854 }
855 spin_unlock_bh(&sess->session_usage_lock);
856
857 return 0;
858 }
859
860 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
861 {
862 spin_lock_bh(&sess->session_usage_lock);
863 sess->session_usage_count--;
864
865 if (!sess->session_usage_count && sess->session_waiting_on_uc)
866 complete(&sess->session_waiting_on_uc_comp);
867
868 spin_unlock_bh(&sess->session_usage_lock);
869 }
870
871 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
872 {
873 spin_lock_bh(&sess->session_usage_lock);
874 sess->session_usage_count++;
875 spin_unlock_bh(&sess->session_usage_lock);
876 }
877
878 /*
879 * Setup conn->if_marker and conn->of_marker values based upon
880 * the initial marker-less interval. (see iSCSI v19 A.2)
881 */
882 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
883 {
884 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
885 /*
886 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
887 */
888 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
889 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
890
891 if (conn->conn_ops->OFMarker) {
892 /*
893 * Account for the first Login Command received not
894 * via iscsi_recv_msg().
895 */
896 conn->of_marker += ISCSI_HDR_LEN;
897 if (conn->of_marker <= OFMarkInt) {
898 conn->of_marker = (OFMarkInt - conn->of_marker);
899 } else {
900 login_ofmarker_count = (conn->of_marker / OFMarkInt);
901 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
902 (login_ofmarker_count * MARKER_SIZE);
903 conn->of_marker = (next_marker - conn->of_marker);
904 }
905 conn->of_marker_offset = 0;
906 pr_debug("Setting OFMarker value to %u based on Initial"
907 " Markerless Interval.\n", conn->of_marker);
908 }
909
910 if (conn->conn_ops->IFMarker) {
911 if (conn->if_marker <= IFMarkInt) {
912 conn->if_marker = (IFMarkInt - conn->if_marker);
913 } else {
914 login_ifmarker_count = (conn->if_marker / IFMarkInt);
915 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
916 (login_ifmarker_count * MARKER_SIZE);
917 conn->if_marker = (next_marker - conn->if_marker);
918 }
919 pr_debug("Setting IFMarker value to %u based on Initial"
920 " Markerless Interval.\n", conn->if_marker);
921 }
922
923 return 0;
924 }
925
926 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
927 {
928 struct iscsi_conn *conn;
929
930 spin_lock_bh(&sess->conn_lock);
931 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
932 if ((conn->cid == cid) &&
933 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
934 iscsit_inc_conn_usage_count(conn);
935 spin_unlock_bh(&sess->conn_lock);
936 return conn;
937 }
938 }
939 spin_unlock_bh(&sess->conn_lock);
940
941 return NULL;
942 }
943
944 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
945 {
946 struct iscsi_conn *conn;
947
948 spin_lock_bh(&sess->conn_lock);
949 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
950 if (conn->cid == cid) {
951 iscsit_inc_conn_usage_count(conn);
952 spin_lock(&conn->state_lock);
953 atomic_set(&conn->connection_wait_rcfr, 1);
954 spin_unlock(&conn->state_lock);
955 spin_unlock_bh(&sess->conn_lock);
956 return conn;
957 }
958 }
959 spin_unlock_bh(&sess->conn_lock);
960
961 return NULL;
962 }
963
964 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
965 {
966 spin_lock_bh(&conn->conn_usage_lock);
967 if (conn->conn_usage_count != 0) {
968 conn->conn_waiting_on_uc = 1;
969 spin_unlock_bh(&conn->conn_usage_lock);
970
971 wait_for_completion(&conn->conn_waiting_on_uc_comp);
972 return;
973 }
974 spin_unlock_bh(&conn->conn_usage_lock);
975 }
976
977 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
978 {
979 spin_lock_bh(&conn->conn_usage_lock);
980 conn->conn_usage_count--;
981
982 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
983 complete(&conn->conn_waiting_on_uc_comp);
984
985 spin_unlock_bh(&conn->conn_usage_lock);
986 }
987
988 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
989 {
990 spin_lock_bh(&conn->conn_usage_lock);
991 conn->conn_usage_count++;
992 spin_unlock_bh(&conn->conn_usage_lock);
993 }
994
995 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
996 {
997 u8 state;
998 struct iscsi_cmd *cmd;
999
1000 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1001 if (!cmd)
1002 return -1;
1003
1004 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1005 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1006 ISTATE_SEND_NOPIN_NO_RESPONSE;
1007 cmd->init_task_tag = 0xFFFFFFFF;
1008 spin_lock_bh(&conn->sess->ttt_lock);
1009 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1010 0xFFFFFFFF;
1011 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1012 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1013 spin_unlock_bh(&conn->sess->ttt_lock);
1014
1015 spin_lock_bh(&conn->cmd_lock);
1016 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1017 spin_unlock_bh(&conn->cmd_lock);
1018
1019 if (want_response)
1020 iscsit_start_nopin_response_timer(conn);
1021 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1022
1023 return 0;
1024 }
1025
1026 static void iscsit_handle_nopin_response_timeout(unsigned long data)
1027 {
1028 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1029
1030 iscsit_inc_conn_usage_count(conn);
1031
1032 spin_lock_bh(&conn->nopin_timer_lock);
1033 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1034 spin_unlock_bh(&conn->nopin_timer_lock);
1035 iscsit_dec_conn_usage_count(conn);
1036 return;
1037 }
1038
1039 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1040 " SID: %u, failing connection.\n", conn->cid,
1041 conn->sess->sid);
1042 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1043 spin_unlock_bh(&conn->nopin_timer_lock);
1044
1045 {
1046 struct iscsi_portal_group *tpg = conn->sess->tpg;
1047 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1048
1049 if (tiqn) {
1050 spin_lock_bh(&tiqn->sess_err_stats.lock);
1051 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1052 (void *)conn->sess->sess_ops->InitiatorName);
1053 tiqn->sess_err_stats.last_sess_failure_type =
1054 ISCSI_SESS_ERR_CXN_TIMEOUT;
1055 tiqn->sess_err_stats.cxn_timeout_errors++;
1056 conn->sess->conn_timeout_errors++;
1057 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1058 }
1059 }
1060
1061 iscsit_cause_connection_reinstatement(conn, 0);
1062 iscsit_dec_conn_usage_count(conn);
1063 }
1064
1065 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1066 {
1067 struct iscsi_session *sess = conn->sess;
1068 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1069
1070 spin_lock_bh(&conn->nopin_timer_lock);
1071 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1072 spin_unlock_bh(&conn->nopin_timer_lock);
1073 return;
1074 }
1075
1076 mod_timer(&conn->nopin_response_timer,
1077 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1078 spin_unlock_bh(&conn->nopin_timer_lock);
1079 }
1080
1081 /*
1082 * Called with conn->nopin_timer_lock held.
1083 */
1084 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1085 {
1086 struct iscsi_session *sess = conn->sess;
1087 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1088
1089 spin_lock_bh(&conn->nopin_timer_lock);
1090 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1091 spin_unlock_bh(&conn->nopin_timer_lock);
1092 return;
1093 }
1094
1095 init_timer(&conn->nopin_response_timer);
1096 conn->nopin_response_timer.expires =
1097 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1098 conn->nopin_response_timer.data = (unsigned long)conn;
1099 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1100 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1101 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1102 add_timer(&conn->nopin_response_timer);
1103
1104 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1105 " seconds\n", conn->cid, na->nopin_response_timeout);
1106 spin_unlock_bh(&conn->nopin_timer_lock);
1107 }
1108
1109 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1110 {
1111 spin_lock_bh(&conn->nopin_timer_lock);
1112 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1113 spin_unlock_bh(&conn->nopin_timer_lock);
1114 return;
1115 }
1116 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1117 spin_unlock_bh(&conn->nopin_timer_lock);
1118
1119 del_timer_sync(&conn->nopin_response_timer);
1120
1121 spin_lock_bh(&conn->nopin_timer_lock);
1122 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1123 spin_unlock_bh(&conn->nopin_timer_lock);
1124 }
1125
1126 static void iscsit_handle_nopin_timeout(unsigned long data)
1127 {
1128 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1129
1130 iscsit_inc_conn_usage_count(conn);
1131
1132 spin_lock_bh(&conn->nopin_timer_lock);
1133 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1134 spin_unlock_bh(&conn->nopin_timer_lock);
1135 iscsit_dec_conn_usage_count(conn);
1136 return;
1137 }
1138 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1139 spin_unlock_bh(&conn->nopin_timer_lock);
1140
1141 iscsit_add_nopin(conn, 1);
1142 iscsit_dec_conn_usage_count(conn);
1143 }
1144
1145 /*
1146 * Called with conn->nopin_timer_lock held.
1147 */
1148 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1149 {
1150 struct iscsi_session *sess = conn->sess;
1151 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1152 /*
1153 * NOPIN timeout is disabled.
1154 */
1155 if (!na->nopin_timeout)
1156 return;
1157
1158 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1159 return;
1160
1161 init_timer(&conn->nopin_timer);
1162 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1163 conn->nopin_timer.data = (unsigned long)conn;
1164 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1165 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1166 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1167 add_timer(&conn->nopin_timer);
1168
1169 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1170 " interval\n", conn->cid, na->nopin_timeout);
1171 }
1172
1173 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1174 {
1175 struct iscsi_session *sess = conn->sess;
1176 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1177 /*
1178 * NOPIN timeout is disabled..
1179 */
1180 if (!na->nopin_timeout)
1181 return;
1182
1183 spin_lock_bh(&conn->nopin_timer_lock);
1184 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1185 spin_unlock_bh(&conn->nopin_timer_lock);
1186 return;
1187 }
1188
1189 init_timer(&conn->nopin_timer);
1190 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1191 conn->nopin_timer.data = (unsigned long)conn;
1192 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1193 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1194 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1195 add_timer(&conn->nopin_timer);
1196
1197 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1198 " interval\n", conn->cid, na->nopin_timeout);
1199 spin_unlock_bh(&conn->nopin_timer_lock);
1200 }
1201
1202 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1203 {
1204 spin_lock_bh(&conn->nopin_timer_lock);
1205 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1206 spin_unlock_bh(&conn->nopin_timer_lock);
1207 return;
1208 }
1209 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1210 spin_unlock_bh(&conn->nopin_timer_lock);
1211
1212 del_timer_sync(&conn->nopin_timer);
1213
1214 spin_lock_bh(&conn->nopin_timer_lock);
1215 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1216 spin_unlock_bh(&conn->nopin_timer_lock);
1217 }
1218
1219 int iscsit_send_tx_data(
1220 struct iscsi_cmd *cmd,
1221 struct iscsi_conn *conn,
1222 int use_misc)
1223 {
1224 int tx_sent, tx_size;
1225 u32 iov_count;
1226 struct kvec *iov;
1227
1228 send_data:
1229 tx_size = cmd->tx_size;
1230
1231 if (!use_misc) {
1232 iov = &cmd->iov_data[0];
1233 iov_count = cmd->iov_data_count;
1234 } else {
1235 iov = &cmd->iov_misc[0];
1236 iov_count = cmd->iov_misc_count;
1237 }
1238
1239 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1240 if (tx_size != tx_sent) {
1241 if (tx_sent == -EAGAIN) {
1242 pr_err("tx_data() returned -EAGAIN\n");
1243 goto send_data;
1244 } else
1245 return -1;
1246 }
1247 cmd->tx_size = 0;
1248
1249 return 0;
1250 }
1251
1252 int iscsit_fe_sendpage_sg(
1253 struct iscsi_cmd *cmd,
1254 struct iscsi_conn *conn)
1255 {
1256 struct scatterlist *sg = cmd->first_data_sg;
1257 struct kvec iov;
1258 u32 tx_hdr_size, data_len;
1259 u32 offset = cmd->first_data_sg_off;
1260 int tx_sent, iov_off;
1261
1262 send_hdr:
1263 tx_hdr_size = ISCSI_HDR_LEN;
1264 if (conn->conn_ops->HeaderDigest)
1265 tx_hdr_size += ISCSI_CRC_LEN;
1266
1267 iov.iov_base = cmd->pdu;
1268 iov.iov_len = tx_hdr_size;
1269
1270 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1271 if (tx_hdr_size != tx_sent) {
1272 if (tx_sent == -EAGAIN) {
1273 pr_err("tx_data() returned -EAGAIN\n");
1274 goto send_hdr;
1275 }
1276 return -1;
1277 }
1278
1279 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1280 /*
1281 * Set iov_off used by padding and data digest tx_data() calls below
1282 * in order to determine proper offset into cmd->iov_data[]
1283 */
1284 if (conn->conn_ops->DataDigest) {
1285 data_len -= ISCSI_CRC_LEN;
1286 if (cmd->padding)
1287 iov_off = (cmd->iov_data_count - 2);
1288 else
1289 iov_off = (cmd->iov_data_count - 1);
1290 } else {
1291 iov_off = (cmd->iov_data_count - 1);
1292 }
1293 /*
1294 * Perform sendpage() for each page in the scatterlist
1295 */
1296 while (data_len) {
1297 u32 space = (sg->length - offset);
1298 u32 sub_len = min_t(u32, data_len, space);
1299 send_pg:
1300 tx_sent = conn->sock->ops->sendpage(conn->sock,
1301 sg_page(sg), sg->offset + offset, sub_len, 0);
1302 if (tx_sent != sub_len) {
1303 if (tx_sent == -EAGAIN) {
1304 pr_err("tcp_sendpage() returned"
1305 " -EAGAIN\n");
1306 goto send_pg;
1307 }
1308
1309 pr_err("tcp_sendpage() failure: %d\n",
1310 tx_sent);
1311 return -1;
1312 }
1313
1314 data_len -= sub_len;
1315 offset = 0;
1316 sg = sg_next(sg);
1317 }
1318
1319 send_padding:
1320 if (cmd->padding) {
1321 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1322
1323 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1324 if (cmd->padding != tx_sent) {
1325 if (tx_sent == -EAGAIN) {
1326 pr_err("tx_data() returned -EAGAIN\n");
1327 goto send_padding;
1328 }
1329 return -1;
1330 }
1331 }
1332
1333 send_datacrc:
1334 if (conn->conn_ops->DataDigest) {
1335 struct kvec *iov_d = &cmd->iov_data[iov_off];
1336
1337 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1338 if (ISCSI_CRC_LEN != tx_sent) {
1339 if (tx_sent == -EAGAIN) {
1340 pr_err("tx_data() returned -EAGAIN\n");
1341 goto send_datacrc;
1342 }
1343 return -1;
1344 }
1345 }
1346
1347 return 0;
1348 }
1349
1350 /*
1351 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1352 * back to the Initiator when an expection condition occurs with the
1353 * errors set in status_class and status_detail.
1354 *
1355 * Parameters: iSCSI Connection, Status Class, Status Detail.
1356 * Returns: 0 on success, -1 on error.
1357 */
1358 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1359 {
1360 u8 iscsi_hdr[ISCSI_HDR_LEN];
1361 int err;
1362 struct kvec iov;
1363 struct iscsi_login_rsp *hdr;
1364
1365 iscsit_collect_login_stats(conn, status_class, status_detail);
1366
1367 memset(&iov, 0, sizeof(struct kvec));
1368 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1369
1370 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1371 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1372 hdr->status_class = status_class;
1373 hdr->status_detail = status_detail;
1374 hdr->itt = cpu_to_be32(conn->login_itt);
1375
1376 iov.iov_base = &iscsi_hdr;
1377 iov.iov_len = ISCSI_HDR_LEN;
1378
1379 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1380
1381 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1382 if (err != ISCSI_HDR_LEN) {
1383 pr_err("tx_data returned less than expected\n");
1384 return -1;
1385 }
1386
1387 return 0;
1388 }
1389
1390 void iscsit_print_session_params(struct iscsi_session *sess)
1391 {
1392 struct iscsi_conn *conn;
1393
1394 pr_debug("-----------------------------[Session Params for"
1395 " SID: %u]-----------------------------\n", sess->sid);
1396 spin_lock_bh(&sess->conn_lock);
1397 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1398 iscsi_dump_conn_ops(conn->conn_ops);
1399 spin_unlock_bh(&sess->conn_lock);
1400
1401 iscsi_dump_sess_ops(sess->sess_ops);
1402 }
1403
1404 static int iscsit_do_rx_data(
1405 struct iscsi_conn *conn,
1406 struct iscsi_data_count *count)
1407 {
1408 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1409 struct kvec *iov_p;
1410 struct msghdr msg;
1411
1412 if (!conn || !conn->sock || !conn->conn_ops)
1413 return -1;
1414
1415 memset(&msg, 0, sizeof(struct msghdr));
1416
1417 iov_p = count->iov;
1418 iov_len = count->iov_count;
1419
1420 while (total_rx < data) {
1421 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1422 (data - total_rx), MSG_WAITALL);
1423 if (rx_loop <= 0) {
1424 pr_debug("rx_loop: %d total_rx: %d\n",
1425 rx_loop, total_rx);
1426 return rx_loop;
1427 }
1428 total_rx += rx_loop;
1429 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1430 rx_loop, total_rx, data);
1431 }
1432
1433 return total_rx;
1434 }
1435
1436 static int iscsit_do_tx_data(
1437 struct iscsi_conn *conn,
1438 struct iscsi_data_count *count)
1439 {
1440 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1441 struct kvec *iov_p;
1442 struct msghdr msg;
1443
1444 if (!conn || !conn->sock || !conn->conn_ops)
1445 return -1;
1446
1447 if (data <= 0) {
1448 pr_err("Data length is: %d\n", data);
1449 return -1;
1450 }
1451
1452 memset(&msg, 0, sizeof(struct msghdr));
1453
1454 iov_p = count->iov;
1455 iov_len = count->iov_count;
1456
1457 while (total_tx < data) {
1458 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1459 (data - total_tx));
1460 if (tx_loop <= 0) {
1461 pr_debug("tx_loop: %d total_tx %d\n",
1462 tx_loop, total_tx);
1463 return tx_loop;
1464 }
1465 total_tx += tx_loop;
1466 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1467 tx_loop, total_tx, data);
1468 }
1469
1470 return total_tx;
1471 }
1472
1473 int rx_data(
1474 struct iscsi_conn *conn,
1475 struct kvec *iov,
1476 int iov_count,
1477 int data)
1478 {
1479 struct iscsi_data_count c;
1480
1481 if (!conn || !conn->sock || !conn->conn_ops)
1482 return -1;
1483
1484 memset(&c, 0, sizeof(struct iscsi_data_count));
1485 c.iov = iov;
1486 c.iov_count = iov_count;
1487 c.data_length = data;
1488 c.type = ISCSI_RX_DATA;
1489
1490 return iscsit_do_rx_data(conn, &c);
1491 }
1492
1493 int tx_data(
1494 struct iscsi_conn *conn,
1495 struct kvec *iov,
1496 int iov_count,
1497 int data)
1498 {
1499 struct iscsi_data_count c;
1500
1501 if (!conn || !conn->sock || !conn->conn_ops)
1502 return -1;
1503
1504 memset(&c, 0, sizeof(struct iscsi_data_count));
1505 c.iov = iov;
1506 c.iov_count = iov_count;
1507 c.data_length = data;
1508 c.type = ISCSI_TX_DATA;
1509
1510 return iscsit_do_tx_data(conn, &c);
1511 }
1512
1513 void iscsit_collect_login_stats(
1514 struct iscsi_conn *conn,
1515 u8 status_class,
1516 u8 status_detail)
1517 {
1518 struct iscsi_param *intrname = NULL;
1519 struct iscsi_tiqn *tiqn;
1520 struct iscsi_login_stats *ls;
1521
1522 tiqn = iscsit_snmp_get_tiqn(conn);
1523 if (!tiqn)
1524 return;
1525
1526 ls = &tiqn->login_stats;
1527
1528 spin_lock(&ls->lock);
1529 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1530 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1531 /* We already have the failure info for this login */
1532 spin_unlock(&ls->lock);
1533 return;
1534 }
1535
1536 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1537 ls->accepts++;
1538 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1539 ls->redirects++;
1540 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1541 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1542 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1543 ls->authenticate_fails++;
1544 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1545 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1546 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1547 ls->authorize_fails++;
1548 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1549 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1550 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1551 ls->negotiate_fails++;
1552 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1553 } else {
1554 ls->other_fails++;
1555 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1556 }
1557
1558 /* Save initiator name, ip address and time, if it is a failed login */
1559 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1560 if (conn->param_list)
1561 intrname = iscsi_find_param_from_key(INITIATORNAME,
1562 conn->param_list);
1563 strcpy(ls->last_intr_fail_name,
1564 (intrname ? intrname->value : "Unknown"));
1565
1566 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1567 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1568 "%s", conn->login_ip);
1569 ls->last_fail_time = get_jiffies_64();
1570 }
1571
1572 spin_unlock(&ls->lock);
1573 }
1574
1575 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1576 {
1577 struct iscsi_portal_group *tpg;
1578
1579 if (!conn || !conn->sess)
1580 return NULL;
1581
1582 tpg = conn->sess->tpg;
1583 if (!tpg)
1584 return NULL;
1585
1586 if (!tpg->tpg_tiqn)
1587 return NULL;
1588
1589 return tpg->tpg_tiqn;
1590 }
Linux kernel - Deliverables
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