1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/list.h>
20 #include <linux/percpu_ida.h>
21 #include <scsi/scsi_tcq.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/iscsi/iscsi_transport.h>
26
27 #include <target/iscsi/iscsi_target_core.h>
28 #include "iscsi_target_parameters.h"
29 #include "iscsi_target_seq_pdu_list.h"
30 #include "iscsi_target_datain_values.h"
31 #include "iscsi_target_erl0.h"
32 #include "iscsi_target_erl1.h"
33 #include "iscsi_target_erl2.h"
34 #include "iscsi_target_tpg.h"
35 #include "iscsi_target_util.h"
36 #include "iscsi_target.h"
37
38 #define PRINT_BUFF(buff, len) \
39 { \
40 int zzz; \
41 \
42 pr_debug("%d:\n", __LINE__); \
43 for (zzz = 0; zzz < len; zzz++) { \
44 if (zzz % 16 == 0) { \
45 if (zzz) \
46 pr_debug("\n"); \
47 pr_debug("%4i: ", zzz); \
48 } \
49 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
50 } \
51 if ((len + 1) % 16) \
52 pr_debug("\n"); \
53 }
54
55 extern struct list_head g_tiqn_list;
56 extern spinlock_t tiqn_lock;
57
58 /*
59 * Called with cmd->r2t_lock held.
60 */
iscsit_add_r2t_to_list(struct iscsi_cmd * cmd,u32 offset,u32 xfer_len,int recovery,u32 r2t_sn)61 int iscsit_add_r2t_to_list(
62 struct iscsi_cmd *cmd,
63 u32 offset,
64 u32 xfer_len,
65 int recovery,
66 u32 r2t_sn)
67 {
68 struct iscsi_r2t *r2t;
69
70 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
71 if (!r2t) {
72 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
73 return -1;
74 }
75 INIT_LIST_HEAD(&r2t->r2t_list);
76
77 r2t->recovery_r2t = recovery;
78 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
79 r2t->offset = offset;
80 r2t->xfer_len = xfer_len;
81 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
82 spin_unlock_bh(&cmd->r2t_lock);
83
84 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
85
86 spin_lock_bh(&cmd->r2t_lock);
87 return 0;
88 }
89
iscsit_get_r2t_for_eos(struct iscsi_cmd * cmd,u32 offset,u32 length)90 struct iscsi_r2t *iscsit_get_r2t_for_eos(
91 struct iscsi_cmd *cmd,
92 u32 offset,
93 u32 length)
94 {
95 struct iscsi_r2t *r2t;
96
97 spin_lock_bh(&cmd->r2t_lock);
98 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
99 if ((r2t->offset <= offset) &&
100 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
101 spin_unlock_bh(&cmd->r2t_lock);
102 return r2t;
103 }
104 }
105 spin_unlock_bh(&cmd->r2t_lock);
106
107 pr_err("Unable to locate R2T for Offset: %u, Length:"
108 " %u\n", offset, length);
109 return NULL;
110 }
111
iscsit_get_r2t_from_list(struct iscsi_cmd * cmd)112 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
113 {
114 struct iscsi_r2t *r2t;
115
116 spin_lock_bh(&cmd->r2t_lock);
117 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
118 if (!r2t->sent_r2t) {
119 spin_unlock_bh(&cmd->r2t_lock);
120 return r2t;
121 }
122 }
123 spin_unlock_bh(&cmd->r2t_lock);
124
125 pr_err("Unable to locate next R2T to send for ITT:"
126 " 0x%08x.\n", cmd->init_task_tag);
127 return NULL;
128 }
129
130 /*
131 * Called with cmd->r2t_lock held.
132 */
iscsit_free_r2t(struct iscsi_r2t * r2t,struct iscsi_cmd * cmd)133 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
134 {
135 list_del(&r2t->r2t_list);
136 kmem_cache_free(lio_r2t_cache, r2t);
137 }
138
iscsit_free_r2ts_from_list(struct iscsi_cmd * cmd)139 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
140 {
141 struct iscsi_r2t *r2t, *r2t_tmp;
142
143 spin_lock_bh(&cmd->r2t_lock);
144 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
145 iscsit_free_r2t(r2t, cmd);
146 spin_unlock_bh(&cmd->r2t_lock);
147 }
148
149 /*
150 * May be called from software interrupt (timer) context for allocating
151 * iSCSI NopINs.
152 */
iscsit_allocate_cmd(struct iscsi_conn * conn,int state)153 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
154 {
155 struct iscsi_cmd *cmd;
156 struct se_session *se_sess = conn->sess->se_sess;
157 int size, tag;
158
159 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
160 if (tag < 0)
161 return NULL;
162
163 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
164 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
165 memset(cmd, 0, size);
166
167 cmd->se_cmd.map_tag = tag;
168 cmd->conn = conn;
169 INIT_LIST_HEAD(&cmd->i_conn_node);
170 INIT_LIST_HEAD(&cmd->datain_list);
171 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
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 EXPORT_SYMBOL(iscsit_allocate_cmd);
181
iscsit_get_seq_holder_for_datain(struct iscsi_cmd * cmd,u32 seq_send_order)182 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
183 struct iscsi_cmd *cmd,
184 u32 seq_send_order)
185 {
186 u32 i;
187
188 for (i = 0; i < cmd->seq_count; i++)
189 if (cmd->seq_list[i].seq_send_order == seq_send_order)
190 return &cmd->seq_list[i];
191
192 return NULL;
193 }
194
iscsit_get_seq_holder_for_r2t(struct iscsi_cmd * cmd)195 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
196 {
197 u32 i;
198
199 if (!cmd->seq_list) {
200 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
201 return NULL;
202 }
203
204 for (i = 0; i < cmd->seq_count; i++) {
205 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
206 continue;
207 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
208 cmd->seq_send_order++;
209 return &cmd->seq_list[i];
210 }
211 }
212
213 return NULL;
214 }
215
iscsit_get_holder_for_r2tsn(struct iscsi_cmd * cmd,u32 r2t_sn)216 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
217 struct iscsi_cmd *cmd,
218 u32 r2t_sn)
219 {
220 struct iscsi_r2t *r2t;
221
222 spin_lock_bh(&cmd->r2t_lock);
223 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
224 if (r2t->r2t_sn == r2t_sn) {
225 spin_unlock_bh(&cmd->r2t_lock);
226 return r2t;
227 }
228 }
229 spin_unlock_bh(&cmd->r2t_lock);
230
231 return NULL;
232 }
233
iscsit_check_received_cmdsn(struct iscsi_session * sess,u32 cmdsn)234 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
235 {
236 u32 max_cmdsn;
237 int ret;
238
239 /*
240 * This is the proper method of checking received CmdSN against
241 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
242 * or order CmdSNs due to multiple connection sessions and/or
243 * CRC failures.
244 */
245 max_cmdsn = atomic_read(&sess->max_cmd_sn);
246 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
247 pr_err("Received CmdSN: 0x%08x is greater than"
248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
249 ret = CMDSN_MAXCMDSN_OVERRUN;
250
251 } else if (cmdsn == sess->exp_cmd_sn) {
252 sess->exp_cmd_sn++;
253 pr_debug("Received CmdSN matches ExpCmdSN,"
254 " incremented ExpCmdSN to: 0x%08x\n",
255 sess->exp_cmd_sn);
256 ret = CMDSN_NORMAL_OPERATION;
257
258 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
259 pr_debug("Received CmdSN: 0x%08x is greater"
260 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
261 cmdsn, sess->exp_cmd_sn);
262 ret = CMDSN_HIGHER_THAN_EXP;
263
264 } else {
265 pr_err("Received CmdSN: 0x%08x is less than"
266 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
267 sess->exp_cmd_sn);
268 ret = CMDSN_LOWER_THAN_EXP;
269 }
270
271 return ret;
272 }
273
274 /*
275 * Commands may be received out of order if MC/S is in use.
276 * Ensure they are executed in CmdSN order.
277 */
iscsit_sequence_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf,__be32 cmdsn)278 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
279 unsigned char *buf, __be32 cmdsn)
280 {
281 int ret, cmdsn_ret;
282 bool reject = false;
283 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
284
285 mutex_lock(&conn->sess->cmdsn_mutex);
286
287 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
288 switch (cmdsn_ret) {
289 case CMDSN_NORMAL_OPERATION:
290 ret = iscsit_execute_cmd(cmd, 0);
291 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
292 iscsit_execute_ooo_cmdsns(conn->sess);
293 else if (ret < 0) {
294 reject = true;
295 ret = CMDSN_ERROR_CANNOT_RECOVER;
296 }
297 break;
298 case CMDSN_HIGHER_THAN_EXP:
299 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
300 if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 break;
304 }
305 ret = CMDSN_HIGHER_THAN_EXP;
306 break;
307 case CMDSN_LOWER_THAN_EXP:
308 case CMDSN_MAXCMDSN_OVERRUN:
309 default:
310 cmd->i_state = ISTATE_REMOVE;
311 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
312 /*
313 * Existing callers for iscsit_sequence_cmd() will silently
314 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
315 * return for CMDSN_MAXCMDSN_OVERRUN as well..
316 */
317 ret = CMDSN_LOWER_THAN_EXP;
318 break;
319 }
320 mutex_unlock(&conn->sess->cmdsn_mutex);
321
322 if (reject)
323 iscsit_reject_cmd(cmd, reason, buf);
324
325 return ret;
326 }
327 EXPORT_SYMBOL(iscsit_sequence_cmd);
328
iscsit_check_unsolicited_dataout(struct iscsi_cmd * cmd,unsigned char * buf)329 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
330 {
331 struct iscsi_conn *conn = cmd->conn;
332 struct se_cmd *se_cmd = &cmd->se_cmd;
333 struct iscsi_data *hdr = (struct iscsi_data *) buf;
334 u32 payload_length = ntoh24(hdr->dlength);
335
336 if (conn->sess->sess_ops->InitialR2T) {
337 pr_err("Received unexpected unsolicited data"
338 " while InitialR2T=Yes, protocol error.\n");
339 transport_send_check_condition_and_sense(se_cmd,
340 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
341 return -1;
342 }
343
344 if ((cmd->first_burst_len + payload_length) >
345 conn->sess->sess_ops->FirstBurstLength) {
346 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
347 " for this Unsolicited DataOut Burst.\n",
348 (cmd->first_burst_len + payload_length),
349 conn->sess->sess_ops->FirstBurstLength);
350 transport_send_check_condition_and_sense(se_cmd,
351 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
352 return -1;
353 }
354
355 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
356 return 0;
357
358 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
359 ((cmd->first_burst_len + payload_length) !=
360 conn->sess->sess_ops->FirstBurstLength)) {
361 pr_err("Unsolicited non-immediate data received %u"
362 " does not equal FirstBurstLength: %u, and does"
363 " not equal ExpXferLen %u.\n",
364 (cmd->first_burst_len + payload_length),
365 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
366 transport_send_check_condition_and_sense(se_cmd,
367 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
368 return -1;
369 }
370 return 0;
371 }
372
iscsit_find_cmd_from_itt(struct iscsi_conn * conn,itt_t init_task_tag)373 struct iscsi_cmd *iscsit_find_cmd_from_itt(
374 struct iscsi_conn *conn,
375 itt_t init_task_tag)
376 {
377 struct iscsi_cmd *cmd;
378
379 spin_lock_bh(&conn->cmd_lock);
380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
381 if (cmd->init_task_tag == init_task_tag) {
382 spin_unlock_bh(&conn->cmd_lock);
383 return cmd;
384 }
385 }
386 spin_unlock_bh(&conn->cmd_lock);
387
388 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
389 init_task_tag, conn->cid);
390 return NULL;
391 }
392 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
393
iscsit_find_cmd_from_itt_or_dump(struct iscsi_conn * conn,itt_t init_task_tag,u32 length)394 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
396 itt_t init_task_tag,
397 u32 length)
398 {
399 struct iscsi_cmd *cmd;
400
401 spin_lock_bh(&conn->cmd_lock);
402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
403 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
404 continue;
405 if (cmd->init_task_tag == init_task_tag) {
406 spin_unlock_bh(&conn->cmd_lock);
407 return cmd;
408 }
409 }
410 spin_unlock_bh(&conn->cmd_lock);
411
412 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
413 " dumping payload\n", init_task_tag, conn->cid);
414 if (length)
415 iscsit_dump_data_payload(conn, length, 1);
416
417 return NULL;
418 }
419
iscsit_find_cmd_from_ttt(struct iscsi_conn * conn,u32 targ_xfer_tag)420 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
421 struct iscsi_conn *conn,
422 u32 targ_xfer_tag)
423 {
424 struct iscsi_cmd *cmd = NULL;
425
426 spin_lock_bh(&conn->cmd_lock);
427 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
428 if (cmd->targ_xfer_tag == targ_xfer_tag) {
429 spin_unlock_bh(&conn->cmd_lock);
430 return cmd;
431 }
432 }
433 spin_unlock_bh(&conn->cmd_lock);
434
435 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
436 targ_xfer_tag, conn->cid);
437 return NULL;
438 }
439
iscsit_find_cmd_for_recovery(struct iscsi_session * sess,struct iscsi_cmd ** cmd_ptr,struct iscsi_conn_recovery ** cr_ptr,itt_t init_task_tag)440 int iscsit_find_cmd_for_recovery(
441 struct iscsi_session *sess,
442 struct iscsi_cmd **cmd_ptr,
443 struct iscsi_conn_recovery **cr_ptr,
444 itt_t init_task_tag)
445 {
446 struct iscsi_cmd *cmd = NULL;
447 struct iscsi_conn_recovery *cr;
448 /*
449 * Scan through the inactive connection recovery list's command list.
450 * If init_task_tag matches the command is still alligent.
451 */
452 spin_lock(&sess->cr_i_lock);
453 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
454 spin_lock(&cr->conn_recovery_cmd_lock);
455 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
456 if (cmd->init_task_tag == init_task_tag) {
457 spin_unlock(&cr->conn_recovery_cmd_lock);
458 spin_unlock(&sess->cr_i_lock);
459
460 *cr_ptr = cr;
461 *cmd_ptr = cmd;
462 return -2;
463 }
464 }
465 spin_unlock(&cr->conn_recovery_cmd_lock);
466 }
467 spin_unlock(&sess->cr_i_lock);
468 /*
469 * Scan through the active connection recovery list's command list.
470 * If init_task_tag matches the command is ready to be reassigned.
471 */
472 spin_lock(&sess->cr_a_lock);
473 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
474 spin_lock(&cr->conn_recovery_cmd_lock);
475 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
476 if (cmd->init_task_tag == init_task_tag) {
477 spin_unlock(&cr->conn_recovery_cmd_lock);
478 spin_unlock(&sess->cr_a_lock);
479
480 *cr_ptr = cr;
481 *cmd_ptr = cmd;
482 return 0;
483 }
484 }
485 spin_unlock(&cr->conn_recovery_cmd_lock);
486 }
487 spin_unlock(&sess->cr_a_lock);
488
489 return -1;
490 }
491
iscsit_add_cmd_to_immediate_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn,u8 state)492 void iscsit_add_cmd_to_immediate_queue(
493 struct iscsi_cmd *cmd,
494 struct iscsi_conn *conn,
495 u8 state)
496 {
497 struct iscsi_queue_req *qr;
498
499 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
500 if (!qr) {
501 pr_err("Unable to allocate memory for"
502 " struct iscsi_queue_req\n");
503 return;
504 }
505 INIT_LIST_HEAD(&qr->qr_list);
506 qr->cmd = cmd;
507 qr->state = state;
508
509 spin_lock_bh(&conn->immed_queue_lock);
510 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
511 atomic_inc(&cmd->immed_queue_count);
512 atomic_set(&conn->check_immediate_queue, 1);
513 spin_unlock_bh(&conn->immed_queue_lock);
514
515 wake_up(&conn->queues_wq);
516 }
517
iscsit_get_cmd_from_immediate_queue(struct iscsi_conn * conn)518 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
519 {
520 struct iscsi_queue_req *qr;
521
522 spin_lock_bh(&conn->immed_queue_lock);
523 if (list_empty(&conn->immed_queue_list)) {
524 spin_unlock_bh(&conn->immed_queue_lock);
525 return NULL;
526 }
527 qr = list_first_entry(&conn->immed_queue_list,
528 struct iscsi_queue_req, qr_list);
529
530 list_del(&qr->qr_list);
531 if (qr->cmd)
532 atomic_dec(&qr->cmd->immed_queue_count);
533 spin_unlock_bh(&conn->immed_queue_lock);
534
535 return qr;
536 }
537
iscsit_remove_cmd_from_immediate_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn)538 static void iscsit_remove_cmd_from_immediate_queue(
539 struct iscsi_cmd *cmd,
540 struct iscsi_conn *conn)
541 {
542 struct iscsi_queue_req *qr, *qr_tmp;
543
544 spin_lock_bh(&conn->immed_queue_lock);
545 if (!atomic_read(&cmd->immed_queue_count)) {
546 spin_unlock_bh(&conn->immed_queue_lock);
547 return;
548 }
549
550 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
551 if (qr->cmd != cmd)
552 continue;
553
554 atomic_dec(&qr->cmd->immed_queue_count);
555 list_del(&qr->qr_list);
556 kmem_cache_free(lio_qr_cache, qr);
557 }
558 spin_unlock_bh(&conn->immed_queue_lock);
559
560 if (atomic_read(&cmd->immed_queue_count)) {
561 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
562 cmd->init_task_tag,
563 atomic_read(&cmd->immed_queue_count));
564 }
565 }
566
iscsit_add_cmd_to_response_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn,u8 state)567 void iscsit_add_cmd_to_response_queue(
568 struct iscsi_cmd *cmd,
569 struct iscsi_conn *conn,
570 u8 state)
571 {
572 struct iscsi_queue_req *qr;
573
574 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
575 if (!qr) {
576 pr_err("Unable to allocate memory for"
577 " struct iscsi_queue_req\n");
578 return;
579 }
580 INIT_LIST_HEAD(&qr->qr_list);
581 qr->cmd = cmd;
582 qr->state = state;
583
584 spin_lock_bh(&conn->response_queue_lock);
585 list_add_tail(&qr->qr_list, &conn->response_queue_list);
586 atomic_inc(&cmd->response_queue_count);
587 spin_unlock_bh(&conn->response_queue_lock);
588
589 wake_up(&conn->queues_wq);
590 }
591
iscsit_get_cmd_from_response_queue(struct iscsi_conn * conn)592 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
593 {
594 struct iscsi_queue_req *qr;
595
596 spin_lock_bh(&conn->response_queue_lock);
597 if (list_empty(&conn->response_queue_list)) {
598 spin_unlock_bh(&conn->response_queue_lock);
599 return NULL;
600 }
601
602 qr = list_first_entry(&conn->response_queue_list,
603 struct iscsi_queue_req, qr_list);
604
605 list_del(&qr->qr_list);
606 if (qr->cmd)
607 atomic_dec(&qr->cmd->response_queue_count);
608 spin_unlock_bh(&conn->response_queue_lock);
609
610 return qr;
611 }
612
iscsit_remove_cmd_from_response_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn)613 static void iscsit_remove_cmd_from_response_queue(
614 struct iscsi_cmd *cmd,
615 struct iscsi_conn *conn)
616 {
617 struct iscsi_queue_req *qr, *qr_tmp;
618
619 spin_lock_bh(&conn->response_queue_lock);
620 if (!atomic_read(&cmd->response_queue_count)) {
621 spin_unlock_bh(&conn->response_queue_lock);
622 return;
623 }
624
625 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
626 qr_list) {
627 if (qr->cmd != cmd)
628 continue;
629
630 atomic_dec(&qr->cmd->response_queue_count);
631 list_del(&qr->qr_list);
632 kmem_cache_free(lio_qr_cache, qr);
633 }
634 spin_unlock_bh(&conn->response_queue_lock);
635
636 if (atomic_read(&cmd->response_queue_count)) {
637 pr_err("ITT: 0x%08x response_queue_count: %d\n",
638 cmd->init_task_tag,
639 atomic_read(&cmd->response_queue_count));
640 }
641 }
642
iscsit_conn_all_queues_empty(struct iscsi_conn * conn)643 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
644 {
645 bool empty;
646
647 spin_lock_bh(&conn->immed_queue_lock);
648 empty = list_empty(&conn->immed_queue_list);
649 spin_unlock_bh(&conn->immed_queue_lock);
650
651 if (!empty)
652 return empty;
653
654 spin_lock_bh(&conn->response_queue_lock);
655 empty = list_empty(&conn->response_queue_list);
656 spin_unlock_bh(&conn->response_queue_lock);
657
658 return empty;
659 }
660
iscsit_free_queue_reqs_for_conn(struct iscsi_conn * conn)661 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
662 {
663 struct iscsi_queue_req *qr, *qr_tmp;
664
665 spin_lock_bh(&conn->immed_queue_lock);
666 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
667 list_del(&qr->qr_list);
668 if (qr->cmd)
669 atomic_dec(&qr->cmd->immed_queue_count);
670
671 kmem_cache_free(lio_qr_cache, qr);
672 }
673 spin_unlock_bh(&conn->immed_queue_lock);
674
675 spin_lock_bh(&conn->response_queue_lock);
676 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
677 qr_list) {
678 list_del(&qr->qr_list);
679 if (qr->cmd)
680 atomic_dec(&qr->cmd->response_queue_count);
681
682 kmem_cache_free(lio_qr_cache, qr);
683 }
684 spin_unlock_bh(&conn->response_queue_lock);
685 }
686
iscsit_release_cmd(struct iscsi_cmd * cmd)687 void iscsit_release_cmd(struct iscsi_cmd *cmd)
688 {
689 struct iscsi_session *sess;
690 struct se_cmd *se_cmd = &cmd->se_cmd;
691
692 if (cmd->conn)
693 sess = cmd->conn->sess;
694 else
695 sess = cmd->sess;
696
697 BUG_ON(!sess || !sess->se_sess);
698
699 kfree(cmd->buf_ptr);
700 kfree(cmd->pdu_list);
701 kfree(cmd->seq_list);
702 kfree(cmd->tmr_req);
703 kfree(cmd->iov_data);
704 kfree(cmd->text_in_ptr);
705
706 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
707 }
708 EXPORT_SYMBOL(iscsit_release_cmd);
709
__iscsit_free_cmd(struct iscsi_cmd * cmd,bool scsi_cmd,bool check_queues)710 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
711 bool check_queues)
712 {
713 struct iscsi_conn *conn = cmd->conn;
714
715 if (scsi_cmd) {
716 if (cmd->data_direction == DMA_TO_DEVICE) {
717 iscsit_stop_dataout_timer(cmd);
718 iscsit_free_r2ts_from_list(cmd);
719 }
720 if (cmd->data_direction == DMA_FROM_DEVICE)
721 iscsit_free_all_datain_reqs(cmd);
722 }
723
724 if (conn && check_queues) {
725 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
726 iscsit_remove_cmd_from_response_queue(cmd, conn);
727 }
728 }
729
iscsit_free_cmd(struct iscsi_cmd * cmd,bool shutdown)730 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
731 {
732 struct se_cmd *se_cmd = NULL;
733 int rc;
734 bool op_scsi = false;
735 /*
736 * Determine if a struct se_cmd is associated with
737 * this struct iscsi_cmd.
738 */
739 switch (cmd->iscsi_opcode) {
740 case ISCSI_OP_SCSI_CMD:
741 op_scsi = true;
742 /*
743 * Fallthrough
744 */
745 case ISCSI_OP_SCSI_TMFUNC:
746 se_cmd = &cmd->se_cmd;
747 __iscsit_free_cmd(cmd, op_scsi, shutdown);
748 rc = transport_generic_free_cmd(se_cmd, shutdown);
749 if (!rc && shutdown && se_cmd->se_sess) {
750 __iscsit_free_cmd(cmd, op_scsi, shutdown);
751 target_put_sess_cmd(se_cmd);
752 }
753 break;
754 case ISCSI_OP_REJECT:
755 /*
756 * Handle special case for REJECT when iscsi_add_reject*() has
757 * overwritten the original iscsi_opcode assignment, and the
758 * associated cmd->se_cmd needs to be released.
759 */
760 if (cmd->se_cmd.se_tfo != NULL) {
761 se_cmd = &cmd->se_cmd;
762 __iscsit_free_cmd(cmd, true, shutdown);
763
764 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
765 if (!rc && shutdown && se_cmd->se_sess) {
766 __iscsit_free_cmd(cmd, true, shutdown);
767 target_put_sess_cmd(se_cmd);
768 }
769 break;
770 }
771 /* Fall-through */
772 default:
773 __iscsit_free_cmd(cmd, false, shutdown);
774 iscsit_release_cmd(cmd);
775 break;
776 }
777 }
778
iscsit_check_session_usage_count(struct iscsi_session * sess)779 int iscsit_check_session_usage_count(struct iscsi_session *sess)
780 {
781 spin_lock_bh(&sess->session_usage_lock);
782 if (sess->session_usage_count != 0) {
783 sess->session_waiting_on_uc = 1;
784 spin_unlock_bh(&sess->session_usage_lock);
785 if (in_interrupt())
786 return 2;
787
788 wait_for_completion(&sess->session_waiting_on_uc_comp);
789 return 1;
790 }
791 spin_unlock_bh(&sess->session_usage_lock);
792
793 return 0;
794 }
795
iscsit_dec_session_usage_count(struct iscsi_session * sess)796 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
797 {
798 spin_lock_bh(&sess->session_usage_lock);
799 sess->session_usage_count--;
800
801 if (!sess->session_usage_count && sess->session_waiting_on_uc)
802 complete(&sess->session_waiting_on_uc_comp);
803
804 spin_unlock_bh(&sess->session_usage_lock);
805 }
806
iscsit_inc_session_usage_count(struct iscsi_session * sess)807 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
808 {
809 spin_lock_bh(&sess->session_usage_lock);
810 sess->session_usage_count++;
811 spin_unlock_bh(&sess->session_usage_lock);
812 }
813
iscsit_get_conn_from_cid(struct iscsi_session * sess,u16 cid)814 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
815 {
816 struct iscsi_conn *conn;
817
818 spin_lock_bh(&sess->conn_lock);
819 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
820 if ((conn->cid == cid) &&
821 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
822 iscsit_inc_conn_usage_count(conn);
823 spin_unlock_bh(&sess->conn_lock);
824 return conn;
825 }
826 }
827 spin_unlock_bh(&sess->conn_lock);
828
829 return NULL;
830 }
831
iscsit_get_conn_from_cid_rcfr(struct iscsi_session * sess,u16 cid)832 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
833 {
834 struct iscsi_conn *conn;
835
836 spin_lock_bh(&sess->conn_lock);
837 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
838 if (conn->cid == cid) {
839 iscsit_inc_conn_usage_count(conn);
840 spin_lock(&conn->state_lock);
841 atomic_set(&conn->connection_wait_rcfr, 1);
842 spin_unlock(&conn->state_lock);
843 spin_unlock_bh(&sess->conn_lock);
844 return conn;
845 }
846 }
847 spin_unlock_bh(&sess->conn_lock);
848
849 return NULL;
850 }
851
iscsit_check_conn_usage_count(struct iscsi_conn * conn)852 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
853 {
854 spin_lock_bh(&conn->conn_usage_lock);
855 if (conn->conn_usage_count != 0) {
856 conn->conn_waiting_on_uc = 1;
857 spin_unlock_bh(&conn->conn_usage_lock);
858
859 wait_for_completion(&conn->conn_waiting_on_uc_comp);
860 return;
861 }
862 spin_unlock_bh(&conn->conn_usage_lock);
863 }
864
iscsit_dec_conn_usage_count(struct iscsi_conn * conn)865 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
866 {
867 spin_lock_bh(&conn->conn_usage_lock);
868 conn->conn_usage_count--;
869
870 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
871 complete(&conn->conn_waiting_on_uc_comp);
872
873 spin_unlock_bh(&conn->conn_usage_lock);
874 }
875
iscsit_inc_conn_usage_count(struct iscsi_conn * conn)876 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
877 {
878 spin_lock_bh(&conn->conn_usage_lock);
879 conn->conn_usage_count++;
880 spin_unlock_bh(&conn->conn_usage_lock);
881 }
882
iscsit_add_nopin(struct iscsi_conn * conn,int want_response)883 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
884 {
885 u8 state;
886 struct iscsi_cmd *cmd;
887
888 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
889 if (!cmd)
890 return -1;
891
892 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
893 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
894 ISTATE_SEND_NOPIN_NO_RESPONSE;
895 cmd->init_task_tag = RESERVED_ITT;
896 cmd->targ_xfer_tag = (want_response) ?
897 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
898 spin_lock_bh(&conn->cmd_lock);
899 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
900 spin_unlock_bh(&conn->cmd_lock);
901
902 if (want_response)
903 iscsit_start_nopin_response_timer(conn);
904 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
905
906 return 0;
907 }
908
iscsit_handle_nopin_response_timeout(unsigned long data)909 static void iscsit_handle_nopin_response_timeout(unsigned long data)
910 {
911 struct iscsi_conn *conn = (struct iscsi_conn *) data;
912
913 iscsit_inc_conn_usage_count(conn);
914
915 spin_lock_bh(&conn->nopin_timer_lock);
916 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
917 spin_unlock_bh(&conn->nopin_timer_lock);
918 iscsit_dec_conn_usage_count(conn);
919 return;
920 }
921
922 pr_debug("Did not receive response to NOPIN on CID: %hu on"
923 " SID: %u, failing connection.\n", conn->cid,
924 conn->sess->sid);
925 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
926 spin_unlock_bh(&conn->nopin_timer_lock);
927
928 {
929 struct iscsi_portal_group *tpg = conn->sess->tpg;
930 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
931
932 if (tiqn) {
933 spin_lock_bh(&tiqn->sess_err_stats.lock);
934 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
935 conn->sess->sess_ops->InitiatorName);
936 tiqn->sess_err_stats.last_sess_failure_type =
937 ISCSI_SESS_ERR_CXN_TIMEOUT;
938 tiqn->sess_err_stats.cxn_timeout_errors++;
939 atomic_long_inc(&conn->sess->conn_timeout_errors);
940 spin_unlock_bh(&tiqn->sess_err_stats.lock);
941 }
942 }
943
944 iscsit_cause_connection_reinstatement(conn, 0);
945 iscsit_dec_conn_usage_count(conn);
946 }
947
iscsit_mod_nopin_response_timer(struct iscsi_conn * conn)948 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
949 {
950 struct iscsi_session *sess = conn->sess;
951 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
952
953 spin_lock_bh(&conn->nopin_timer_lock);
954 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
955 spin_unlock_bh(&conn->nopin_timer_lock);
956 return;
957 }
958
959 mod_timer(&conn->nopin_response_timer,
960 (get_jiffies_64() + na->nopin_response_timeout * HZ));
961 spin_unlock_bh(&conn->nopin_timer_lock);
962 }
963
964 /*
965 * Called with conn->nopin_timer_lock held.
966 */
iscsit_start_nopin_response_timer(struct iscsi_conn * conn)967 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
968 {
969 struct iscsi_session *sess = conn->sess;
970 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
971
972 spin_lock_bh(&conn->nopin_timer_lock);
973 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
974 spin_unlock_bh(&conn->nopin_timer_lock);
975 return;
976 }
977
978 init_timer(&conn->nopin_response_timer);
979 conn->nopin_response_timer.expires =
980 (get_jiffies_64() + na->nopin_response_timeout * HZ);
981 conn->nopin_response_timer.data = (unsigned long)conn;
982 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
983 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
984 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
985 add_timer(&conn->nopin_response_timer);
986
987 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
988 " seconds\n", conn->cid, na->nopin_response_timeout);
989 spin_unlock_bh(&conn->nopin_timer_lock);
990 }
991
iscsit_stop_nopin_response_timer(struct iscsi_conn * conn)992 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
993 {
994 spin_lock_bh(&conn->nopin_timer_lock);
995 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
996 spin_unlock_bh(&conn->nopin_timer_lock);
997 return;
998 }
999 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1000 spin_unlock_bh(&conn->nopin_timer_lock);
1001
1002 del_timer_sync(&conn->nopin_response_timer);
1003
1004 spin_lock_bh(&conn->nopin_timer_lock);
1005 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1006 spin_unlock_bh(&conn->nopin_timer_lock);
1007 }
1008
iscsit_handle_nopin_timeout(unsigned long data)1009 static void iscsit_handle_nopin_timeout(unsigned long data)
1010 {
1011 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1012
1013 iscsit_inc_conn_usage_count(conn);
1014
1015 spin_lock_bh(&conn->nopin_timer_lock);
1016 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1017 spin_unlock_bh(&conn->nopin_timer_lock);
1018 iscsit_dec_conn_usage_count(conn);
1019 return;
1020 }
1021 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1022 spin_unlock_bh(&conn->nopin_timer_lock);
1023
1024 iscsit_add_nopin(conn, 1);
1025 iscsit_dec_conn_usage_count(conn);
1026 }
1027
1028 /*
1029 * Called with conn->nopin_timer_lock held.
1030 */
__iscsit_start_nopin_timer(struct iscsi_conn * conn)1031 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1032 {
1033 struct iscsi_session *sess = conn->sess;
1034 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1035 /*
1036 * NOPIN timeout is disabled.
1037 */
1038 if (!na->nopin_timeout)
1039 return;
1040
1041 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1042 return;
1043
1044 init_timer(&conn->nopin_timer);
1045 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1046 conn->nopin_timer.data = (unsigned long)conn;
1047 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1048 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1049 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1050 add_timer(&conn->nopin_timer);
1051
1052 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1053 " interval\n", conn->cid, na->nopin_timeout);
1054 }
1055
iscsit_start_nopin_timer(struct iscsi_conn * conn)1056 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1057 {
1058 struct iscsi_session *sess = conn->sess;
1059 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1060 /*
1061 * NOPIN timeout is disabled..
1062 */
1063 if (!na->nopin_timeout)
1064 return;
1065
1066 spin_lock_bh(&conn->nopin_timer_lock);
1067 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1069 return;
1070 }
1071
1072 init_timer(&conn->nopin_timer);
1073 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1074 conn->nopin_timer.data = (unsigned long)conn;
1075 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1076 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1077 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1078 add_timer(&conn->nopin_timer);
1079
1080 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1081 " interval\n", conn->cid, na->nopin_timeout);
1082 spin_unlock_bh(&conn->nopin_timer_lock);
1083 }
1084
iscsit_stop_nopin_timer(struct iscsi_conn * conn)1085 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1086 {
1087 spin_lock_bh(&conn->nopin_timer_lock);
1088 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1089 spin_unlock_bh(&conn->nopin_timer_lock);
1090 return;
1091 }
1092 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1093 spin_unlock_bh(&conn->nopin_timer_lock);
1094
1095 del_timer_sync(&conn->nopin_timer);
1096
1097 spin_lock_bh(&conn->nopin_timer_lock);
1098 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1099 spin_unlock_bh(&conn->nopin_timer_lock);
1100 }
1101
iscsit_send_tx_data(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int use_misc)1102 int iscsit_send_tx_data(
1103 struct iscsi_cmd *cmd,
1104 struct iscsi_conn *conn,
1105 int use_misc)
1106 {
1107 int tx_sent, tx_size;
1108 u32 iov_count;
1109 struct kvec *iov;
1110
1111 send_data:
1112 tx_size = cmd->tx_size;
1113
1114 if (!use_misc) {
1115 iov = &cmd->iov_data[0];
1116 iov_count = cmd->iov_data_count;
1117 } else {
1118 iov = &cmd->iov_misc[0];
1119 iov_count = cmd->iov_misc_count;
1120 }
1121
1122 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1123 if (tx_size != tx_sent) {
1124 if (tx_sent == -EAGAIN) {
1125 pr_err("tx_data() returned -EAGAIN\n");
1126 goto send_data;
1127 } else
1128 return -1;
1129 }
1130 cmd->tx_size = 0;
1131
1132 return 0;
1133 }
1134
iscsit_fe_sendpage_sg(struct iscsi_cmd * cmd,struct iscsi_conn * conn)1135 int iscsit_fe_sendpage_sg(
1136 struct iscsi_cmd *cmd,
1137 struct iscsi_conn *conn)
1138 {
1139 struct scatterlist *sg = cmd->first_data_sg;
1140 struct kvec iov;
1141 u32 tx_hdr_size, data_len;
1142 u32 offset = cmd->first_data_sg_off;
1143 int tx_sent, iov_off;
1144
1145 send_hdr:
1146 tx_hdr_size = ISCSI_HDR_LEN;
1147 if (conn->conn_ops->HeaderDigest)
1148 tx_hdr_size += ISCSI_CRC_LEN;
1149
1150 iov.iov_base = cmd->pdu;
1151 iov.iov_len = tx_hdr_size;
1152
1153 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1154 if (tx_hdr_size != tx_sent) {
1155 if (tx_sent == -EAGAIN) {
1156 pr_err("tx_data() returned -EAGAIN\n");
1157 goto send_hdr;
1158 }
1159 return -1;
1160 }
1161
1162 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1163 /*
1164 * Set iov_off used by padding and data digest tx_data() calls below
1165 * in order to determine proper offset into cmd->iov_data[]
1166 */
1167 if (conn->conn_ops->DataDigest) {
1168 data_len -= ISCSI_CRC_LEN;
1169 if (cmd->padding)
1170 iov_off = (cmd->iov_data_count - 2);
1171 else
1172 iov_off = (cmd->iov_data_count - 1);
1173 } else {
1174 iov_off = (cmd->iov_data_count - 1);
1175 }
1176 /*
1177 * Perform sendpage() for each page in the scatterlist
1178 */
1179 while (data_len) {
1180 u32 space = (sg->length - offset);
1181 u32 sub_len = min_t(u32, data_len, space);
1182 send_pg:
1183 tx_sent = conn->sock->ops->sendpage(conn->sock,
1184 sg_page(sg), sg->offset + offset, sub_len, 0);
1185 if (tx_sent != sub_len) {
1186 if (tx_sent == -EAGAIN) {
1187 pr_err("tcp_sendpage() returned"
1188 " -EAGAIN\n");
1189 goto send_pg;
1190 }
1191
1192 pr_err("tcp_sendpage() failure: %d\n",
1193 tx_sent);
1194 return -1;
1195 }
1196
1197 data_len -= sub_len;
1198 offset = 0;
1199 sg = sg_next(sg);
1200 }
1201
1202 send_padding:
1203 if (cmd->padding) {
1204 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1205
1206 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1207 if (cmd->padding != tx_sent) {
1208 if (tx_sent == -EAGAIN) {
1209 pr_err("tx_data() returned -EAGAIN\n");
1210 goto send_padding;
1211 }
1212 return -1;
1213 }
1214 }
1215
1216 send_datacrc:
1217 if (conn->conn_ops->DataDigest) {
1218 struct kvec *iov_d = &cmd->iov_data[iov_off];
1219
1220 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1221 if (ISCSI_CRC_LEN != tx_sent) {
1222 if (tx_sent == -EAGAIN) {
1223 pr_err("tx_data() returned -EAGAIN\n");
1224 goto send_datacrc;
1225 }
1226 return -1;
1227 }
1228 }
1229
1230 return 0;
1231 }
1232
1233 /*
1234 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1235 * back to the Initiator when an expection condition occurs with the
1236 * errors set in status_class and status_detail.
1237 *
1238 * Parameters: iSCSI Connection, Status Class, Status Detail.
1239 * Returns: 0 on success, -1 on error.
1240 */
iscsit_tx_login_rsp(struct iscsi_conn * conn,u8 status_class,u8 status_detail)1241 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1242 {
1243 struct iscsi_login_rsp *hdr;
1244 struct iscsi_login *login = conn->conn_login;
1245
1246 login->login_failed = 1;
1247 iscsit_collect_login_stats(conn, status_class, status_detail);
1248
1249 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1250
1251 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1252 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1253 hdr->status_class = status_class;
1254 hdr->status_detail = status_detail;
1255 hdr->itt = conn->login_itt;
1256
1257 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1258 }
1259
iscsit_print_session_params(struct iscsi_session * sess)1260 void iscsit_print_session_params(struct iscsi_session *sess)
1261 {
1262 struct iscsi_conn *conn;
1263
1264 pr_debug("-----------------------------[Session Params for"
1265 " SID: %u]-----------------------------\n", sess->sid);
1266 spin_lock_bh(&sess->conn_lock);
1267 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1268 iscsi_dump_conn_ops(conn->conn_ops);
1269 spin_unlock_bh(&sess->conn_lock);
1270
1271 iscsi_dump_sess_ops(sess->sess_ops);
1272 }
1273
iscsit_do_rx_data(struct iscsi_conn * conn,struct iscsi_data_count * count)1274 static int iscsit_do_rx_data(
1275 struct iscsi_conn *conn,
1276 struct iscsi_data_count *count)
1277 {
1278 int data = count->data_length, rx_loop = 0, total_rx = 0;
1279 struct msghdr msg;
1280
1281 if (!conn || !conn->sock || !conn->conn_ops)
1282 return -1;
1283
1284 memset(&msg, 0, sizeof(struct msghdr));
1285 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1286 count->iov, count->iov_count, data);
1287
1288 while (total_rx < data) {
1289 rx_loop = sock_recvmsg(conn->sock, &msg,
1290 (data - total_rx), MSG_WAITALL);
1291 if (rx_loop <= 0) {
1292 pr_debug("rx_loop: %d total_rx: %d\n",
1293 rx_loop, total_rx);
1294 return rx_loop;
1295 }
1296 total_rx += rx_loop;
1297 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1298 rx_loop, total_rx, data);
1299 }
1300
1301 return total_rx;
1302 }
1303
iscsit_do_tx_data(struct iscsi_conn * conn,struct iscsi_data_count * count)1304 static int iscsit_do_tx_data(
1305 struct iscsi_conn *conn,
1306 struct iscsi_data_count *count)
1307 {
1308 int ret, iov_len;
1309 struct kvec *iov_p;
1310 struct msghdr msg;
1311
1312 if (!conn || !conn->sock || !conn->conn_ops)
1313 return -1;
1314
1315 if (count->data_length <= 0) {
1316 pr_err("Data length is: %d\n", count->data_length);
1317 return -1;
1318 }
1319
1320 memset(&msg, 0, sizeof(struct msghdr));
1321
1322 iov_p = count->iov;
1323 iov_len = count->iov_count;
1324
1325 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1326 count->data_length);
1327 if (ret != count->data_length) {
1328 pr_err("Unexpected ret: %d send data %d\n",
1329 ret, count->data_length);
1330 return -EPIPE;
1331 }
1332 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
1333
1334 return ret;
1335 }
1336
rx_data(struct iscsi_conn * conn,struct kvec * iov,int iov_count,int data)1337 int rx_data(
1338 struct iscsi_conn *conn,
1339 struct kvec *iov,
1340 int iov_count,
1341 int data)
1342 {
1343 struct iscsi_data_count c;
1344
1345 if (!conn || !conn->sock || !conn->conn_ops)
1346 return -1;
1347
1348 memset(&c, 0, sizeof(struct iscsi_data_count));
1349 c.iov = iov;
1350 c.iov_count = iov_count;
1351 c.data_length = data;
1352 c.type = ISCSI_RX_DATA;
1353
1354 return iscsit_do_rx_data(conn, &c);
1355 }
1356
tx_data(struct iscsi_conn * conn,struct kvec * iov,int iov_count,int data)1357 int tx_data(
1358 struct iscsi_conn *conn,
1359 struct kvec *iov,
1360 int iov_count,
1361 int data)
1362 {
1363 struct iscsi_data_count c;
1364
1365 if (!conn || !conn->sock || !conn->conn_ops)
1366 return -1;
1367
1368 memset(&c, 0, sizeof(struct iscsi_data_count));
1369 c.iov = iov;
1370 c.iov_count = iov_count;
1371 c.data_length = data;
1372 c.type = ISCSI_TX_DATA;
1373
1374 return iscsit_do_tx_data(conn, &c);
1375 }
1376
sockaddr_equal(struct sockaddr_storage * x,struct sockaddr_storage * y)1377 static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y)
1378 {
1379 switch (x->ss_family) {
1380 case AF_INET: {
1381 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
1382 struct sockaddr_in *siny = (struct sockaddr_in *)y;
1383 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
1384 return false;
1385 if (sinx->sin_port != siny->sin_port)
1386 return false;
1387 break;
1388 }
1389 case AF_INET6: {
1390 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
1391 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
1392 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
1393 return false;
1394 if (sinx->sin6_port != siny->sin6_port)
1395 return false;
1396 break;
1397 }
1398 default:
1399 return false;
1400 }
1401 return true;
1402 }
1403
iscsit_collect_login_stats(struct iscsi_conn * conn,u8 status_class,u8 status_detail)1404 void iscsit_collect_login_stats(
1405 struct iscsi_conn *conn,
1406 u8 status_class,
1407 u8 status_detail)
1408 {
1409 struct iscsi_param *intrname = NULL;
1410 struct iscsi_tiqn *tiqn;
1411 struct iscsi_login_stats *ls;
1412
1413 tiqn = iscsit_snmp_get_tiqn(conn);
1414 if (!tiqn)
1415 return;
1416
1417 ls = &tiqn->login_stats;
1418
1419 spin_lock(&ls->lock);
1420 if (sockaddr_equal(&conn->login_sockaddr, &ls->last_intr_fail_sockaddr) &&
1421 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1422 /* We already have the failure info for this login */
1423 spin_unlock(&ls->lock);
1424 return;
1425 }
1426
1427 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1428 ls->accepts++;
1429 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1430 ls->redirects++;
1431 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1432 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1433 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1434 ls->authenticate_fails++;
1435 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1436 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1437 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1438 ls->authorize_fails++;
1439 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1440 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1441 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1442 ls->negotiate_fails++;
1443 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1444 } else {
1445 ls->other_fails++;
1446 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1447 }
1448
1449 /* Save initiator name, ip address and time, if it is a failed login */
1450 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1451 if (conn->param_list)
1452 intrname = iscsi_find_param_from_key(INITIATORNAME,
1453 conn->param_list);
1454 strlcpy(ls->last_intr_fail_name,
1455 (intrname ? intrname->value : "Unknown"),
1456 sizeof(ls->last_intr_fail_name));
1457
1458 ls->last_intr_fail_ip_family = conn->login_family;
1459
1460 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1461 ls->last_fail_time = get_jiffies_64();
1462 }
1463
1464 spin_unlock(&ls->lock);
1465 }
1466
iscsit_snmp_get_tiqn(struct iscsi_conn * conn)1467 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1468 {
1469 struct iscsi_portal_group *tpg;
1470
1471 if (!conn || !conn->sess)
1472 return NULL;
1473
1474 tpg = conn->sess->tpg;
1475 if (!tpg)
1476 return NULL;
1477
1478 if (!tpg->tpg_tiqn)
1479 return NULL;
1480
1481 return tpg->tpg_tiqn;
1482 }
1483