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 <net/ipv6.h> /* ipv6_addr_equal() */
22 #include <scsi/scsi_tcq.h>
23 #include <scsi/iscsi_proto.h>
24 #include <target/target_core_base.h>
25 #include <target/target_core_fabric.h>
26 #include <target/iscsi/iscsi_transport.h>
27
28 #include <target/iscsi/iscsi_target_core.h>
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_util.h"
37 #include "iscsi_target.h"
38
39 #define PRINT_BUFF(buff, len) \
40 { \
41 int zzz; \
42 \
43 pr_debug("%d:\n", __LINE__); \
44 for (zzz = 0; zzz < len; zzz++) { \
45 if (zzz % 16 == 0) { \
46 if (zzz) \
47 pr_debug("\n"); \
48 pr_debug("%4i: ", zzz); \
49 } \
50 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
51 } \
52 if ((len + 1) % 16) \
53 pr_debug("\n"); \
54 }
55
56 extern struct list_head g_tiqn_list;
57 extern spinlock_t tiqn_lock;
58
59 /*
60 * Called with cmd->r2t_lock held.
61 */
iscsit_add_r2t_to_list(struct iscsi_cmd * cmd,u32 offset,u32 xfer_len,int recovery,u32 r2t_sn)62 int iscsit_add_r2t_to_list(
63 struct iscsi_cmd *cmd,
64 u32 offset,
65 u32 xfer_len,
66 int recovery,
67 u32 r2t_sn)
68 {
69 struct iscsi_r2t *r2t;
70
71 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
72 if (!r2t) {
73 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
74 return -1;
75 }
76 INIT_LIST_HEAD(&r2t->r2t_list);
77
78 r2t->recovery_r2t = recovery;
79 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
80 r2t->offset = offset;
81 r2t->xfer_len = xfer_len;
82 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
83 spin_unlock_bh(&cmd->r2t_lock);
84
85 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
86
87 spin_lock_bh(&cmd->r2t_lock);
88 return 0;
89 }
90
iscsit_get_r2t_for_eos(struct iscsi_cmd * cmd,u32 offset,u32 length)91 struct iscsi_r2t *iscsit_get_r2t_for_eos(
92 struct iscsi_cmd *cmd,
93 u32 offset,
94 u32 length)
95 {
96 struct iscsi_r2t *r2t;
97
98 spin_lock_bh(&cmd->r2t_lock);
99 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
100 if ((r2t->offset <= offset) &&
101 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
102 spin_unlock_bh(&cmd->r2t_lock);
103 return r2t;
104 }
105 }
106 spin_unlock_bh(&cmd->r2t_lock);
107
108 pr_err("Unable to locate R2T for Offset: %u, Length:"
109 " %u\n", offset, length);
110 return NULL;
111 }
112
iscsit_get_r2t_from_list(struct iscsi_cmd * cmd)113 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
114 {
115 struct iscsi_r2t *r2t;
116
117 spin_lock_bh(&cmd->r2t_lock);
118 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
119 if (!r2t->sent_r2t) {
120 spin_unlock_bh(&cmd->r2t_lock);
121 return r2t;
122 }
123 }
124 spin_unlock_bh(&cmd->r2t_lock);
125
126 pr_err("Unable to locate next R2T to send for ITT:"
127 " 0x%08x.\n", cmd->init_task_tag);
128 return NULL;
129 }
130
131 /*
132 * Called with cmd->r2t_lock held.
133 */
iscsit_free_r2t(struct iscsi_r2t * r2t,struct iscsi_cmd * cmd)134 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
135 {
136 list_del(&r2t->r2t_list);
137 kmem_cache_free(lio_r2t_cache, r2t);
138 }
139
iscsit_free_r2ts_from_list(struct iscsi_cmd * cmd)140 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
141 {
142 struct iscsi_r2t *r2t, *r2t_tmp;
143
144 spin_lock_bh(&cmd->r2t_lock);
145 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
146 iscsit_free_r2t(r2t, cmd);
147 spin_unlock_bh(&cmd->r2t_lock);
148 }
149
150 /*
151 * May be called from software interrupt (timer) context for allocating
152 * iSCSI NopINs.
153 */
iscsit_allocate_cmd(struct iscsi_conn * conn,int state)154 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
155 {
156 struct iscsi_cmd *cmd;
157 struct se_session *se_sess = conn->sess->se_sess;
158 int size, tag;
159
160 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
161 if (tag < 0)
162 return NULL;
163
164 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
165 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
166 memset(cmd, 0, size);
167
168 cmd->se_cmd.map_tag = tag;
169 cmd->conn = conn;
170 cmd->data_direction = DMA_NONE;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
179
180 return cmd;
181 }
182 EXPORT_SYMBOL(iscsit_allocate_cmd);
183
iscsit_get_seq_holder_for_datain(struct iscsi_cmd * cmd,u32 seq_send_order)184 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
185 struct iscsi_cmd *cmd,
186 u32 seq_send_order)
187 {
188 u32 i;
189
190 for (i = 0; i < cmd->seq_count; i++)
191 if (cmd->seq_list[i].seq_send_order == seq_send_order)
192 return &cmd->seq_list[i];
193
194 return NULL;
195 }
196
iscsit_get_seq_holder_for_r2t(struct iscsi_cmd * cmd)197 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
198 {
199 u32 i;
200
201 if (!cmd->seq_list) {
202 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
203 return NULL;
204 }
205
206 for (i = 0; i < cmd->seq_count; i++) {
207 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
208 continue;
209 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
210 cmd->seq_send_order++;
211 return &cmd->seq_list[i];
212 }
213 }
214
215 return NULL;
216 }
217
iscsit_get_holder_for_r2tsn(struct iscsi_cmd * cmd,u32 r2t_sn)218 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
219 struct iscsi_cmd *cmd,
220 u32 r2t_sn)
221 {
222 struct iscsi_r2t *r2t;
223
224 spin_lock_bh(&cmd->r2t_lock);
225 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
226 if (r2t->r2t_sn == r2t_sn) {
227 spin_unlock_bh(&cmd->r2t_lock);
228 return r2t;
229 }
230 }
231 spin_unlock_bh(&cmd->r2t_lock);
232
233 return NULL;
234 }
235
iscsit_check_received_cmdsn(struct iscsi_session * sess,u32 cmdsn)236 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
237 {
238 u32 max_cmdsn;
239 int ret;
240
241 /*
242 * This is the proper method of checking received CmdSN against
243 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
244 * or order CmdSNs due to multiple connection sessions and/or
245 * CRC failures.
246 */
247 max_cmdsn = atomic_read(&sess->max_cmd_sn);
248 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
249 pr_err("Received CmdSN: 0x%08x is greater than"
250 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
251 ret = CMDSN_MAXCMDSN_OVERRUN;
252
253 } else if (cmdsn == sess->exp_cmd_sn) {
254 sess->exp_cmd_sn++;
255 pr_debug("Received CmdSN matches ExpCmdSN,"
256 " incremented ExpCmdSN to: 0x%08x\n",
257 sess->exp_cmd_sn);
258 ret = CMDSN_NORMAL_OPERATION;
259
260 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
261 pr_debug("Received CmdSN: 0x%08x is greater"
262 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
263 cmdsn, sess->exp_cmd_sn);
264 ret = CMDSN_HIGHER_THAN_EXP;
265
266 } else {
267 pr_err("Received CmdSN: 0x%08x is less than"
268 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
269 sess->exp_cmd_sn);
270 ret = CMDSN_LOWER_THAN_EXP;
271 }
272
273 return ret;
274 }
275
276 /*
277 * Commands may be received out of order if MC/S is in use.
278 * Ensure they are executed in CmdSN order.
279 */
iscsit_sequence_cmd(struct iscsi_conn * conn,struct iscsi_cmd * cmd,unsigned char * buf,__be32 cmdsn)280 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
281 unsigned char *buf, __be32 cmdsn)
282 {
283 int ret, cmdsn_ret;
284 bool reject = false;
285 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
286
287 mutex_lock(&conn->sess->cmdsn_mutex);
288
289 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
290 switch (cmdsn_ret) {
291 case CMDSN_NORMAL_OPERATION:
292 ret = iscsit_execute_cmd(cmd, 0);
293 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
294 iscsit_execute_ooo_cmdsns(conn->sess);
295 else if (ret < 0) {
296 reject = true;
297 ret = CMDSN_ERROR_CANNOT_RECOVER;
298 }
299 break;
300 case CMDSN_HIGHER_THAN_EXP:
301 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
302 if (ret < 0) {
303 reject = true;
304 ret = CMDSN_ERROR_CANNOT_RECOVER;
305 break;
306 }
307 ret = CMDSN_HIGHER_THAN_EXP;
308 break;
309 case CMDSN_LOWER_THAN_EXP:
310 case CMDSN_MAXCMDSN_OVERRUN:
311 default:
312 cmd->i_state = ISTATE_REMOVE;
313 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
314 /*
315 * Existing callers for iscsit_sequence_cmd() will silently
316 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
317 * return for CMDSN_MAXCMDSN_OVERRUN as well..
318 */
319 ret = CMDSN_LOWER_THAN_EXP;
320 break;
321 }
322 mutex_unlock(&conn->sess->cmdsn_mutex);
323
324 if (reject)
325 iscsit_reject_cmd(cmd, reason, buf);
326
327 return ret;
328 }
329 EXPORT_SYMBOL(iscsit_sequence_cmd);
330
iscsit_check_unsolicited_dataout(struct iscsi_cmd * cmd,unsigned char * buf)331 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
332 {
333 struct iscsi_conn *conn = cmd->conn;
334 struct se_cmd *se_cmd = &cmd->se_cmd;
335 struct iscsi_data *hdr = (struct iscsi_data *) buf;
336 u32 payload_length = ntoh24(hdr->dlength);
337
338 if (conn->sess->sess_ops->InitialR2T) {
339 pr_err("Received unexpected unsolicited data"
340 " while InitialR2T=Yes, protocol error.\n");
341 transport_send_check_condition_and_sense(se_cmd,
342 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
343 return -1;
344 }
345
346 if ((cmd->first_burst_len + payload_length) >
347 conn->sess->sess_ops->FirstBurstLength) {
348 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
349 " for this Unsolicited DataOut Burst.\n",
350 (cmd->first_burst_len + payload_length),
351 conn->sess->sess_ops->FirstBurstLength);
352 transport_send_check_condition_and_sense(se_cmd,
353 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
354 return -1;
355 }
356
357 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
358 return 0;
359
360 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
361 ((cmd->first_burst_len + payload_length) !=
362 conn->sess->sess_ops->FirstBurstLength)) {
363 pr_err("Unsolicited non-immediate data received %u"
364 " does not equal FirstBurstLength: %u, and does"
365 " not equal ExpXferLen %u.\n",
366 (cmd->first_burst_len + payload_length),
367 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
368 transport_send_check_condition_and_sense(se_cmd,
369 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
370 return -1;
371 }
372 return 0;
373 }
374
iscsit_find_cmd_from_itt(struct iscsi_conn * conn,itt_t init_task_tag)375 struct iscsi_cmd *iscsit_find_cmd_from_itt(
376 struct iscsi_conn *conn,
377 itt_t init_task_tag)
378 {
379 struct iscsi_cmd *cmd;
380
381 spin_lock_bh(&conn->cmd_lock);
382 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
383 if (cmd->init_task_tag == init_task_tag) {
384 spin_unlock_bh(&conn->cmd_lock);
385 return cmd;
386 }
387 }
388 spin_unlock_bh(&conn->cmd_lock);
389
390 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
391 init_task_tag, conn->cid);
392 return NULL;
393 }
394 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
395
iscsit_find_cmd_from_itt_or_dump(struct iscsi_conn * conn,itt_t init_task_tag,u32 length)396 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
397 struct iscsi_conn *conn,
398 itt_t init_task_tag,
399 u32 length)
400 {
401 struct iscsi_cmd *cmd;
402
403 spin_lock_bh(&conn->cmd_lock);
404 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
405 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
406 continue;
407 if (cmd->init_task_tag == init_task_tag) {
408 spin_unlock_bh(&conn->cmd_lock);
409 return cmd;
410 }
411 }
412 spin_unlock_bh(&conn->cmd_lock);
413
414 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
415 " dumping payload\n", init_task_tag, conn->cid);
416 if (length)
417 iscsit_dump_data_payload(conn, length, 1);
418
419 return NULL;
420 }
421 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
422
iscsit_find_cmd_from_ttt(struct iscsi_conn * conn,u32 targ_xfer_tag)423 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
424 struct iscsi_conn *conn,
425 u32 targ_xfer_tag)
426 {
427 struct iscsi_cmd *cmd = NULL;
428
429 spin_lock_bh(&conn->cmd_lock);
430 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
431 if (cmd->targ_xfer_tag == targ_xfer_tag) {
432 spin_unlock_bh(&conn->cmd_lock);
433 return cmd;
434 }
435 }
436 spin_unlock_bh(&conn->cmd_lock);
437
438 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
439 targ_xfer_tag, conn->cid);
440 return NULL;
441 }
442
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)443 int iscsit_find_cmd_for_recovery(
444 struct iscsi_session *sess,
445 struct iscsi_cmd **cmd_ptr,
446 struct iscsi_conn_recovery **cr_ptr,
447 itt_t init_task_tag)
448 {
449 struct iscsi_cmd *cmd = NULL;
450 struct iscsi_conn_recovery *cr;
451 /*
452 * Scan through the inactive connection recovery list's command list.
453 * If init_task_tag matches the command is still alligent.
454 */
455 spin_lock(&sess->cr_i_lock);
456 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
457 spin_lock(&cr->conn_recovery_cmd_lock);
458 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
459 if (cmd->init_task_tag == init_task_tag) {
460 spin_unlock(&cr->conn_recovery_cmd_lock);
461 spin_unlock(&sess->cr_i_lock);
462
463 *cr_ptr = cr;
464 *cmd_ptr = cmd;
465 return -2;
466 }
467 }
468 spin_unlock(&cr->conn_recovery_cmd_lock);
469 }
470 spin_unlock(&sess->cr_i_lock);
471 /*
472 * Scan through the active connection recovery list's command list.
473 * If init_task_tag matches the command is ready to be reassigned.
474 */
475 spin_lock(&sess->cr_a_lock);
476 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
477 spin_lock(&cr->conn_recovery_cmd_lock);
478 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
479 if (cmd->init_task_tag == init_task_tag) {
480 spin_unlock(&cr->conn_recovery_cmd_lock);
481 spin_unlock(&sess->cr_a_lock);
482
483 *cr_ptr = cr;
484 *cmd_ptr = cmd;
485 return 0;
486 }
487 }
488 spin_unlock(&cr->conn_recovery_cmd_lock);
489 }
490 spin_unlock(&sess->cr_a_lock);
491
492 return -1;
493 }
494
iscsit_add_cmd_to_immediate_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn,u8 state)495 void iscsit_add_cmd_to_immediate_queue(
496 struct iscsi_cmd *cmd,
497 struct iscsi_conn *conn,
498 u8 state)
499 {
500 struct iscsi_queue_req *qr;
501
502 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
503 if (!qr) {
504 pr_err("Unable to allocate memory for"
505 " struct iscsi_queue_req\n");
506 return;
507 }
508 INIT_LIST_HEAD(&qr->qr_list);
509 qr->cmd = cmd;
510 qr->state = state;
511
512 spin_lock_bh(&conn->immed_queue_lock);
513 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
514 atomic_inc(&cmd->immed_queue_count);
515 atomic_set(&conn->check_immediate_queue, 1);
516 spin_unlock_bh(&conn->immed_queue_lock);
517
518 wake_up(&conn->queues_wq);
519 }
520 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
521
iscsit_get_cmd_from_immediate_queue(struct iscsi_conn * conn)522 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
523 {
524 struct iscsi_queue_req *qr;
525
526 spin_lock_bh(&conn->immed_queue_lock);
527 if (list_empty(&conn->immed_queue_list)) {
528 spin_unlock_bh(&conn->immed_queue_lock);
529 return NULL;
530 }
531 qr = list_first_entry(&conn->immed_queue_list,
532 struct iscsi_queue_req, qr_list);
533
534 list_del(&qr->qr_list);
535 if (qr->cmd)
536 atomic_dec(&qr->cmd->immed_queue_count);
537 spin_unlock_bh(&conn->immed_queue_lock);
538
539 return qr;
540 }
541
iscsit_remove_cmd_from_immediate_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn)542 static void iscsit_remove_cmd_from_immediate_queue(
543 struct iscsi_cmd *cmd,
544 struct iscsi_conn *conn)
545 {
546 struct iscsi_queue_req *qr, *qr_tmp;
547
548 spin_lock_bh(&conn->immed_queue_lock);
549 if (!atomic_read(&cmd->immed_queue_count)) {
550 spin_unlock_bh(&conn->immed_queue_lock);
551 return;
552 }
553
554 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
555 if (qr->cmd != cmd)
556 continue;
557
558 atomic_dec(&qr->cmd->immed_queue_count);
559 list_del(&qr->qr_list);
560 kmem_cache_free(lio_qr_cache, qr);
561 }
562 spin_unlock_bh(&conn->immed_queue_lock);
563
564 if (atomic_read(&cmd->immed_queue_count)) {
565 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
566 cmd->init_task_tag,
567 atomic_read(&cmd->immed_queue_count));
568 }
569 }
570
iscsit_add_cmd_to_response_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn,u8 state)571 int iscsit_add_cmd_to_response_queue(
572 struct iscsi_cmd *cmd,
573 struct iscsi_conn *conn,
574 u8 state)
575 {
576 struct iscsi_queue_req *qr;
577
578 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
579 if (!qr) {
580 pr_err("Unable to allocate memory for"
581 " struct iscsi_queue_req\n");
582 return -ENOMEM;
583 }
584 INIT_LIST_HEAD(&qr->qr_list);
585 qr->cmd = cmd;
586 qr->state = state;
587
588 spin_lock_bh(&conn->response_queue_lock);
589 list_add_tail(&qr->qr_list, &conn->response_queue_list);
590 atomic_inc(&cmd->response_queue_count);
591 spin_unlock_bh(&conn->response_queue_lock);
592
593 wake_up(&conn->queues_wq);
594 return 0;
595 }
596
iscsit_get_cmd_from_response_queue(struct iscsi_conn * conn)597 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
598 {
599 struct iscsi_queue_req *qr;
600
601 spin_lock_bh(&conn->response_queue_lock);
602 if (list_empty(&conn->response_queue_list)) {
603 spin_unlock_bh(&conn->response_queue_lock);
604 return NULL;
605 }
606
607 qr = list_first_entry(&conn->response_queue_list,
608 struct iscsi_queue_req, qr_list);
609
610 list_del(&qr->qr_list);
611 if (qr->cmd)
612 atomic_dec(&qr->cmd->response_queue_count);
613 spin_unlock_bh(&conn->response_queue_lock);
614
615 return qr;
616 }
617
iscsit_remove_cmd_from_response_queue(struct iscsi_cmd * cmd,struct iscsi_conn * conn)618 static void iscsit_remove_cmd_from_response_queue(
619 struct iscsi_cmd *cmd,
620 struct iscsi_conn *conn)
621 {
622 struct iscsi_queue_req *qr, *qr_tmp;
623
624 spin_lock_bh(&conn->response_queue_lock);
625 if (!atomic_read(&cmd->response_queue_count)) {
626 spin_unlock_bh(&conn->response_queue_lock);
627 return;
628 }
629
630 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
631 qr_list) {
632 if (qr->cmd != cmd)
633 continue;
634
635 atomic_dec(&qr->cmd->response_queue_count);
636 list_del(&qr->qr_list);
637 kmem_cache_free(lio_qr_cache, qr);
638 }
639 spin_unlock_bh(&conn->response_queue_lock);
640
641 if (atomic_read(&cmd->response_queue_count)) {
642 pr_err("ITT: 0x%08x response_queue_count: %d\n",
643 cmd->init_task_tag,
644 atomic_read(&cmd->response_queue_count));
645 }
646 }
647
iscsit_conn_all_queues_empty(struct iscsi_conn * conn)648 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
649 {
650 bool empty;
651
652 spin_lock_bh(&conn->immed_queue_lock);
653 empty = list_empty(&conn->immed_queue_list);
654 spin_unlock_bh(&conn->immed_queue_lock);
655
656 if (!empty)
657 return empty;
658
659 spin_lock_bh(&conn->response_queue_lock);
660 empty = list_empty(&conn->response_queue_list);
661 spin_unlock_bh(&conn->response_queue_lock);
662
663 return empty;
664 }
665
iscsit_free_queue_reqs_for_conn(struct iscsi_conn * conn)666 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
667 {
668 struct iscsi_queue_req *qr, *qr_tmp;
669
670 spin_lock_bh(&conn->immed_queue_lock);
671 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
672 list_del(&qr->qr_list);
673 if (qr->cmd)
674 atomic_dec(&qr->cmd->immed_queue_count);
675
676 kmem_cache_free(lio_qr_cache, qr);
677 }
678 spin_unlock_bh(&conn->immed_queue_lock);
679
680 spin_lock_bh(&conn->response_queue_lock);
681 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
682 qr_list) {
683 list_del(&qr->qr_list);
684 if (qr->cmd)
685 atomic_dec(&qr->cmd->response_queue_count);
686
687 kmem_cache_free(lio_qr_cache, qr);
688 }
689 spin_unlock_bh(&conn->response_queue_lock);
690 }
691
iscsit_release_cmd(struct iscsi_cmd * cmd)692 void iscsit_release_cmd(struct iscsi_cmd *cmd)
693 {
694 struct iscsi_session *sess;
695 struct se_cmd *se_cmd = &cmd->se_cmd;
696
697 WARN_ON(!list_empty(&cmd->i_conn_node));
698
699 if (cmd->conn)
700 sess = cmd->conn->sess;
701 else
702 sess = cmd->sess;
703
704 BUG_ON(!sess || !sess->se_sess);
705
706 kfree(cmd->buf_ptr);
707 kfree(cmd->pdu_list);
708 kfree(cmd->seq_list);
709 kfree(cmd->tmr_req);
710 kfree(cmd->iov_data);
711 kfree(cmd->text_in_ptr);
712
713 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
714 }
715 EXPORT_SYMBOL(iscsit_release_cmd);
716
__iscsit_free_cmd(struct iscsi_cmd * cmd,bool check_queues)717 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
718 {
719 struct iscsi_conn *conn = cmd->conn;
720
721 WARN_ON(!list_empty(&cmd->i_conn_node));
722
723 if (cmd->data_direction == DMA_TO_DEVICE) {
724 iscsit_stop_dataout_timer(cmd);
725 iscsit_free_r2ts_from_list(cmd);
726 }
727 if (cmd->data_direction == DMA_FROM_DEVICE)
728 iscsit_free_all_datain_reqs(cmd);
729
730 if (conn && check_queues) {
731 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
732 iscsit_remove_cmd_from_response_queue(cmd, conn);
733 }
734
735 if (conn && conn->conn_transport->iscsit_release_cmd)
736 conn->conn_transport->iscsit_release_cmd(conn, cmd);
737 }
738
iscsit_free_cmd(struct iscsi_cmd * cmd,bool shutdown)739 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
740 {
741 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
742 int rc;
743
744 __iscsit_free_cmd(cmd, shutdown);
745 if (se_cmd) {
746 rc = transport_generic_free_cmd(se_cmd, shutdown);
747 if (!rc && shutdown && se_cmd->se_sess) {
748 __iscsit_free_cmd(cmd, shutdown);
749 target_put_sess_cmd(se_cmd);
750 }
751 } else {
752 iscsit_release_cmd(cmd);
753 }
754 }
755 EXPORT_SYMBOL(iscsit_free_cmd);
756
iscsit_check_session_usage_count(struct iscsi_session * sess)757 int iscsit_check_session_usage_count(struct iscsi_session *sess)
758 {
759 spin_lock_bh(&sess->session_usage_lock);
760 if (sess->session_usage_count != 0) {
761 sess->session_waiting_on_uc = 1;
762 spin_unlock_bh(&sess->session_usage_lock);
763 if (in_interrupt())
764 return 2;
765
766 wait_for_completion(&sess->session_waiting_on_uc_comp);
767 return 1;
768 }
769 spin_unlock_bh(&sess->session_usage_lock);
770
771 return 0;
772 }
773
iscsit_dec_session_usage_count(struct iscsi_session * sess)774 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
775 {
776 spin_lock_bh(&sess->session_usage_lock);
777 sess->session_usage_count--;
778
779 if (!sess->session_usage_count && sess->session_waiting_on_uc)
780 complete(&sess->session_waiting_on_uc_comp);
781
782 spin_unlock_bh(&sess->session_usage_lock);
783 }
784
iscsit_inc_session_usage_count(struct iscsi_session * sess)785 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
786 {
787 spin_lock_bh(&sess->session_usage_lock);
788 sess->session_usage_count++;
789 spin_unlock_bh(&sess->session_usage_lock);
790 }
791
iscsit_get_conn_from_cid(struct iscsi_session * sess,u16 cid)792 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
793 {
794 struct iscsi_conn *conn;
795
796 spin_lock_bh(&sess->conn_lock);
797 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
798 if ((conn->cid == cid) &&
799 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
800 iscsit_inc_conn_usage_count(conn);
801 spin_unlock_bh(&sess->conn_lock);
802 return conn;
803 }
804 }
805 spin_unlock_bh(&sess->conn_lock);
806
807 return NULL;
808 }
809
iscsit_get_conn_from_cid_rcfr(struct iscsi_session * sess,u16 cid)810 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
811 {
812 struct iscsi_conn *conn;
813
814 spin_lock_bh(&sess->conn_lock);
815 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
816 if (conn->cid == cid) {
817 iscsit_inc_conn_usage_count(conn);
818 spin_lock(&conn->state_lock);
819 atomic_set(&conn->connection_wait_rcfr, 1);
820 spin_unlock(&conn->state_lock);
821 spin_unlock_bh(&sess->conn_lock);
822 return conn;
823 }
824 }
825 spin_unlock_bh(&sess->conn_lock);
826
827 return NULL;
828 }
829
iscsit_check_conn_usage_count(struct iscsi_conn * conn)830 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
831 {
832 spin_lock_bh(&conn->conn_usage_lock);
833 if (conn->conn_usage_count != 0) {
834 conn->conn_waiting_on_uc = 1;
835 spin_unlock_bh(&conn->conn_usage_lock);
836
837 wait_for_completion(&conn->conn_waiting_on_uc_comp);
838 return;
839 }
840 spin_unlock_bh(&conn->conn_usage_lock);
841 }
842
iscsit_dec_conn_usage_count(struct iscsi_conn * conn)843 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
844 {
845 spin_lock_bh(&conn->conn_usage_lock);
846 conn->conn_usage_count--;
847
848 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
849 complete(&conn->conn_waiting_on_uc_comp);
850
851 spin_unlock_bh(&conn->conn_usage_lock);
852 }
853
iscsit_inc_conn_usage_count(struct iscsi_conn * conn)854 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
855 {
856 spin_lock_bh(&conn->conn_usage_lock);
857 conn->conn_usage_count++;
858 spin_unlock_bh(&conn->conn_usage_lock);
859 }
860
iscsit_add_nopin(struct iscsi_conn * conn,int want_response)861 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
862 {
863 u8 state;
864 struct iscsi_cmd *cmd;
865
866 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
867 if (!cmd)
868 return -1;
869
870 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
871 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
872 ISTATE_SEND_NOPIN_NO_RESPONSE;
873 cmd->init_task_tag = RESERVED_ITT;
874 cmd->targ_xfer_tag = (want_response) ?
875 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
876 spin_lock_bh(&conn->cmd_lock);
877 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
878 spin_unlock_bh(&conn->cmd_lock);
879
880 if (want_response)
881 iscsit_start_nopin_response_timer(conn);
882 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
883
884 return 0;
885 }
886
iscsit_handle_nopin_response_timeout(unsigned long data)887 static void iscsit_handle_nopin_response_timeout(unsigned long data)
888 {
889 struct iscsi_conn *conn = (struct iscsi_conn *) data;
890
891 iscsit_inc_conn_usage_count(conn);
892
893 spin_lock_bh(&conn->nopin_timer_lock);
894 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
895 spin_unlock_bh(&conn->nopin_timer_lock);
896 iscsit_dec_conn_usage_count(conn);
897 return;
898 }
899
900 pr_debug("Did not receive response to NOPIN on CID: %hu on"
901 " SID: %u, failing connection.\n", conn->cid,
902 conn->sess->sid);
903 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
904 spin_unlock_bh(&conn->nopin_timer_lock);
905
906 {
907 struct iscsi_portal_group *tpg = conn->sess->tpg;
908 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
909
910 if (tiqn) {
911 spin_lock_bh(&tiqn->sess_err_stats.lock);
912 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
913 conn->sess->sess_ops->InitiatorName);
914 tiqn->sess_err_stats.last_sess_failure_type =
915 ISCSI_SESS_ERR_CXN_TIMEOUT;
916 tiqn->sess_err_stats.cxn_timeout_errors++;
917 atomic_long_inc(&conn->sess->conn_timeout_errors);
918 spin_unlock_bh(&tiqn->sess_err_stats.lock);
919 }
920 }
921
922 iscsit_cause_connection_reinstatement(conn, 0);
923 iscsit_dec_conn_usage_count(conn);
924 }
925
iscsit_mod_nopin_response_timer(struct iscsi_conn * conn)926 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
927 {
928 struct iscsi_session *sess = conn->sess;
929 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
930
931 spin_lock_bh(&conn->nopin_timer_lock);
932 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
933 spin_unlock_bh(&conn->nopin_timer_lock);
934 return;
935 }
936
937 mod_timer(&conn->nopin_response_timer,
938 (get_jiffies_64() + na->nopin_response_timeout * HZ));
939 spin_unlock_bh(&conn->nopin_timer_lock);
940 }
941
942 /*
943 * Called with conn->nopin_timer_lock held.
944 */
iscsit_start_nopin_response_timer(struct iscsi_conn * conn)945 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
946 {
947 struct iscsi_session *sess = conn->sess;
948 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
949
950 spin_lock_bh(&conn->nopin_timer_lock);
951 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
952 spin_unlock_bh(&conn->nopin_timer_lock);
953 return;
954 }
955
956 init_timer(&conn->nopin_response_timer);
957 conn->nopin_response_timer.expires =
958 (get_jiffies_64() + na->nopin_response_timeout * HZ);
959 conn->nopin_response_timer.data = (unsigned long)conn;
960 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
961 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
962 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
963 add_timer(&conn->nopin_response_timer);
964
965 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
966 " seconds\n", conn->cid, na->nopin_response_timeout);
967 spin_unlock_bh(&conn->nopin_timer_lock);
968 }
969
iscsit_stop_nopin_response_timer(struct iscsi_conn * conn)970 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
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 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
978 spin_unlock_bh(&conn->nopin_timer_lock);
979
980 del_timer_sync(&conn->nopin_response_timer);
981
982 spin_lock_bh(&conn->nopin_timer_lock);
983 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
984 spin_unlock_bh(&conn->nopin_timer_lock);
985 }
986
iscsit_handle_nopin_timeout(unsigned long data)987 static void iscsit_handle_nopin_timeout(unsigned long data)
988 {
989 struct iscsi_conn *conn = (struct iscsi_conn *) data;
990
991 iscsit_inc_conn_usage_count(conn);
992
993 spin_lock_bh(&conn->nopin_timer_lock);
994 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
995 spin_unlock_bh(&conn->nopin_timer_lock);
996 iscsit_dec_conn_usage_count(conn);
997 return;
998 }
999 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1000 spin_unlock_bh(&conn->nopin_timer_lock);
1001
1002 iscsit_add_nopin(conn, 1);
1003 iscsit_dec_conn_usage_count(conn);
1004 }
1005
1006 /*
1007 * Called with conn->nopin_timer_lock held.
1008 */
__iscsit_start_nopin_timer(struct iscsi_conn * conn)1009 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1010 {
1011 struct iscsi_session *sess = conn->sess;
1012 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1013 /*
1014 * NOPIN timeout is disabled.
1015 */
1016 if (!na->nopin_timeout)
1017 return;
1018
1019 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1020 return;
1021
1022 init_timer(&conn->nopin_timer);
1023 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1024 conn->nopin_timer.data = (unsigned long)conn;
1025 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1026 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1027 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1028 add_timer(&conn->nopin_timer);
1029
1030 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1031 " interval\n", conn->cid, na->nopin_timeout);
1032 }
1033
iscsit_start_nopin_timer(struct iscsi_conn * conn)1034 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1035 {
1036 struct iscsi_session *sess = conn->sess;
1037 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1038 /*
1039 * NOPIN timeout is disabled..
1040 */
1041 if (!na->nopin_timeout)
1042 return;
1043
1044 spin_lock_bh(&conn->nopin_timer_lock);
1045 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1047 return;
1048 }
1049
1050 init_timer(&conn->nopin_timer);
1051 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1052 conn->nopin_timer.data = (unsigned long)conn;
1053 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1054 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1055 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1056 add_timer(&conn->nopin_timer);
1057
1058 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1059 " interval\n", conn->cid, na->nopin_timeout);
1060 spin_unlock_bh(&conn->nopin_timer_lock);
1061 }
1062
iscsit_stop_nopin_timer(struct iscsi_conn * conn)1063 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1064 {
1065 spin_lock_bh(&conn->nopin_timer_lock);
1066 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1067 spin_unlock_bh(&conn->nopin_timer_lock);
1068 return;
1069 }
1070 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1071 spin_unlock_bh(&conn->nopin_timer_lock);
1072
1073 del_timer_sync(&conn->nopin_timer);
1074
1075 spin_lock_bh(&conn->nopin_timer_lock);
1076 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1077 spin_unlock_bh(&conn->nopin_timer_lock);
1078 }
1079
iscsit_send_tx_data(struct iscsi_cmd * cmd,struct iscsi_conn * conn,int use_misc)1080 int iscsit_send_tx_data(
1081 struct iscsi_cmd *cmd,
1082 struct iscsi_conn *conn,
1083 int use_misc)
1084 {
1085 int tx_sent, tx_size;
1086 u32 iov_count;
1087 struct kvec *iov;
1088
1089 send_data:
1090 tx_size = cmd->tx_size;
1091
1092 if (!use_misc) {
1093 iov = &cmd->iov_data[0];
1094 iov_count = cmd->iov_data_count;
1095 } else {
1096 iov = &cmd->iov_misc[0];
1097 iov_count = cmd->iov_misc_count;
1098 }
1099
1100 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1101 if (tx_size != tx_sent) {
1102 if (tx_sent == -EAGAIN) {
1103 pr_err("tx_data() returned -EAGAIN\n");
1104 goto send_data;
1105 } else
1106 return -1;
1107 }
1108 cmd->tx_size = 0;
1109
1110 return 0;
1111 }
1112
iscsit_fe_sendpage_sg(struct iscsi_cmd * cmd,struct iscsi_conn * conn)1113 int iscsit_fe_sendpage_sg(
1114 struct iscsi_cmd *cmd,
1115 struct iscsi_conn *conn)
1116 {
1117 struct scatterlist *sg = cmd->first_data_sg;
1118 struct kvec iov;
1119 u32 tx_hdr_size, data_len;
1120 u32 offset = cmd->first_data_sg_off;
1121 int tx_sent, iov_off;
1122
1123 send_hdr:
1124 tx_hdr_size = ISCSI_HDR_LEN;
1125 if (conn->conn_ops->HeaderDigest)
1126 tx_hdr_size += ISCSI_CRC_LEN;
1127
1128 iov.iov_base = cmd->pdu;
1129 iov.iov_len = tx_hdr_size;
1130
1131 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1132 if (tx_hdr_size != tx_sent) {
1133 if (tx_sent == -EAGAIN) {
1134 pr_err("tx_data() returned -EAGAIN\n");
1135 goto send_hdr;
1136 }
1137 return -1;
1138 }
1139
1140 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1141 /*
1142 * Set iov_off used by padding and data digest tx_data() calls below
1143 * in order to determine proper offset into cmd->iov_data[]
1144 */
1145 if (conn->conn_ops->DataDigest) {
1146 data_len -= ISCSI_CRC_LEN;
1147 if (cmd->padding)
1148 iov_off = (cmd->iov_data_count - 2);
1149 else
1150 iov_off = (cmd->iov_data_count - 1);
1151 } else {
1152 iov_off = (cmd->iov_data_count - 1);
1153 }
1154 /*
1155 * Perform sendpage() for each page in the scatterlist
1156 */
1157 while (data_len) {
1158 u32 space = (sg->length - offset);
1159 u32 sub_len = min_t(u32, data_len, space);
1160 send_pg:
1161 tx_sent = conn->sock->ops->sendpage(conn->sock,
1162 sg_page(sg), sg->offset + offset, sub_len, 0);
1163 if (tx_sent != sub_len) {
1164 if (tx_sent == -EAGAIN) {
1165 pr_err("tcp_sendpage() returned"
1166 " -EAGAIN\n");
1167 goto send_pg;
1168 }
1169
1170 pr_err("tcp_sendpage() failure: %d\n",
1171 tx_sent);
1172 return -1;
1173 }
1174
1175 data_len -= sub_len;
1176 offset = 0;
1177 sg = sg_next(sg);
1178 }
1179
1180 send_padding:
1181 if (cmd->padding) {
1182 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1183
1184 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1185 if (cmd->padding != tx_sent) {
1186 if (tx_sent == -EAGAIN) {
1187 pr_err("tx_data() returned -EAGAIN\n");
1188 goto send_padding;
1189 }
1190 return -1;
1191 }
1192 }
1193
1194 send_datacrc:
1195 if (conn->conn_ops->DataDigest) {
1196 struct kvec *iov_d = &cmd->iov_data[iov_off];
1197
1198 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1199 if (ISCSI_CRC_LEN != tx_sent) {
1200 if (tx_sent == -EAGAIN) {
1201 pr_err("tx_data() returned -EAGAIN\n");
1202 goto send_datacrc;
1203 }
1204 return -1;
1205 }
1206 }
1207
1208 return 0;
1209 }
1210
1211 /*
1212 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1213 * back to the Initiator when an expection condition occurs with the
1214 * errors set in status_class and status_detail.
1215 *
1216 * Parameters: iSCSI Connection, Status Class, Status Detail.
1217 * Returns: 0 on success, -1 on error.
1218 */
iscsit_tx_login_rsp(struct iscsi_conn * conn,u8 status_class,u8 status_detail)1219 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1220 {
1221 struct iscsi_login_rsp *hdr;
1222 struct iscsi_login *login = conn->conn_login;
1223
1224 login->login_failed = 1;
1225 iscsit_collect_login_stats(conn, status_class, status_detail);
1226
1227 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1228
1229 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1230 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1231 hdr->status_class = status_class;
1232 hdr->status_detail = status_detail;
1233 hdr->itt = conn->login_itt;
1234
1235 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1236 }
1237
iscsit_print_session_params(struct iscsi_session * sess)1238 void iscsit_print_session_params(struct iscsi_session *sess)
1239 {
1240 struct iscsi_conn *conn;
1241
1242 pr_debug("-----------------------------[Session Params for"
1243 " SID: %u]-----------------------------\n", sess->sid);
1244 spin_lock_bh(&sess->conn_lock);
1245 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1246 iscsi_dump_conn_ops(conn->conn_ops);
1247 spin_unlock_bh(&sess->conn_lock);
1248
1249 iscsi_dump_sess_ops(sess->sess_ops);
1250 }
1251
iscsit_do_rx_data(struct iscsi_conn * conn,struct iscsi_data_count * count)1252 static int iscsit_do_rx_data(
1253 struct iscsi_conn *conn,
1254 struct iscsi_data_count *count)
1255 {
1256 int data = count->data_length, rx_loop = 0, total_rx = 0;
1257 struct msghdr msg;
1258
1259 if (!conn || !conn->sock || !conn->conn_ops)
1260 return -1;
1261
1262 memset(&msg, 0, sizeof(struct msghdr));
1263 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1264 count->iov, count->iov_count, data);
1265
1266 while (msg_data_left(&msg)) {
1267 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1268 if (rx_loop <= 0) {
1269 pr_debug("rx_loop: %d total_rx: %d\n",
1270 rx_loop, total_rx);
1271 return rx_loop;
1272 }
1273 total_rx += rx_loop;
1274 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1275 rx_loop, total_rx, data);
1276 }
1277
1278 return total_rx;
1279 }
1280
rx_data(struct iscsi_conn * conn,struct kvec * iov,int iov_count,int data)1281 int rx_data(
1282 struct iscsi_conn *conn,
1283 struct kvec *iov,
1284 int iov_count,
1285 int data)
1286 {
1287 struct iscsi_data_count c;
1288
1289 if (!conn || !conn->sock || !conn->conn_ops)
1290 return -1;
1291
1292 memset(&c, 0, sizeof(struct iscsi_data_count));
1293 c.iov = iov;
1294 c.iov_count = iov_count;
1295 c.data_length = data;
1296 c.type = ISCSI_RX_DATA;
1297
1298 return iscsit_do_rx_data(conn, &c);
1299 }
1300
tx_data(struct iscsi_conn * conn,struct kvec * iov,int iov_count,int data)1301 int tx_data(
1302 struct iscsi_conn *conn,
1303 struct kvec *iov,
1304 int iov_count,
1305 int data)
1306 {
1307 struct msghdr msg;
1308 int total_tx = 0;
1309
1310 if (!conn || !conn->sock || !conn->conn_ops)
1311 return -1;
1312
1313 if (data <= 0) {
1314 pr_err("Data length is: %d\n", data);
1315 return -1;
1316 }
1317
1318 memset(&msg, 0, sizeof(struct msghdr));
1319
1320 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
1321 iov, iov_count, data);
1322
1323 while (msg_data_left(&msg)) {
1324 int tx_loop = sock_sendmsg(conn->sock, &msg);
1325 if (tx_loop <= 0) {
1326 pr_debug("tx_loop: %d total_tx %d\n",
1327 tx_loop, total_tx);
1328 return tx_loop;
1329 }
1330 total_tx += tx_loop;
1331 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1332 tx_loop, total_tx, data);
1333 }
1334
1335 return total_tx;
1336 }
1337
iscsit_collect_login_stats(struct iscsi_conn * conn,u8 status_class,u8 status_detail)1338 void iscsit_collect_login_stats(
1339 struct iscsi_conn *conn,
1340 u8 status_class,
1341 u8 status_detail)
1342 {
1343 struct iscsi_param *intrname = NULL;
1344 struct iscsi_tiqn *tiqn;
1345 struct iscsi_login_stats *ls;
1346
1347 tiqn = iscsit_snmp_get_tiqn(conn);
1348 if (!tiqn)
1349 return;
1350
1351 ls = &tiqn->login_stats;
1352
1353 spin_lock(&ls->lock);
1354 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1355 ls->accepts++;
1356 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1357 ls->redirects++;
1358 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1359 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1360 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1361 ls->authenticate_fails++;
1362 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1363 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1364 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1365 ls->authorize_fails++;
1366 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1367 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1368 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1369 ls->negotiate_fails++;
1370 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1371 } else {
1372 ls->other_fails++;
1373 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1374 }
1375
1376 /* Save initiator name, ip address and time, if it is a failed login */
1377 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1378 if (conn->param_list)
1379 intrname = iscsi_find_param_from_key(INITIATORNAME,
1380 conn->param_list);
1381 strlcpy(ls->last_intr_fail_name,
1382 (intrname ? intrname->value : "Unknown"),
1383 sizeof(ls->last_intr_fail_name));
1384
1385 ls->last_intr_fail_ip_family = conn->login_family;
1386
1387 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1388 ls->last_fail_time = get_jiffies_64();
1389 }
1390
1391 spin_unlock(&ls->lock);
1392 }
1393
iscsit_snmp_get_tiqn(struct iscsi_conn * conn)1394 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1395 {
1396 struct iscsi_portal_group *tpg;
1397
1398 if (!conn)
1399 return NULL;
1400
1401 tpg = conn->tpg;
1402 if (!tpg)
1403 return NULL;
1404
1405 if (!tpg->tpg_tiqn)
1406 return NULL;
1407
1408 return tpg->tpg_tiqn;
1409 }
1410