1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains the iSCSI Target specific utility functions.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/list.h>
12 #include <linux/sched/signal.h>
13 #include <net/ipv6.h> /* ipv6_addr_equal() */
14 #include <scsi/scsi_tcq.h>
15 #include <scsi/iscsi_proto.h>
16 #include <target/target_core_base.h>
17 #include <target/target_core_fabric.h>
18 #include <target/iscsi/iscsi_transport.h>
19
20 #include <target/iscsi/iscsi_target_core.h>
21 #include "iscsi_target_parameters.h"
22 #include "iscsi_target_seq_pdu_list.h"
23 #include "iscsi_target_datain_values.h"
24 #include "iscsi_target_erl0.h"
25 #include "iscsi_target_erl1.h"
26 #include "iscsi_target_erl2.h"
27 #include "iscsi_target_tpg.h"
28 #include "iscsi_target_util.h"
29 #include "iscsi_target.h"
30
31 extern struct list_head g_tiqn_list;
32 extern spinlock_t tiqn_lock;
33
iscsit_add_r2t_to_list(struct iscsit_cmd * cmd,u32 offset,u32 xfer_len,int recovery,u32 r2t_sn)34 int iscsit_add_r2t_to_list(
35 struct iscsit_cmd *cmd,
36 u32 offset,
37 u32 xfer_len,
38 int recovery,
39 u32 r2t_sn)
40 {
41 struct iscsi_r2t *r2t;
42
43 lockdep_assert_held(&cmd->r2t_lock);
44
45 WARN_ON_ONCE((s32)xfer_len < 0);
46
47 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
48 if (!r2t) {
49 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
50 return -1;
51 }
52 INIT_LIST_HEAD(&r2t->r2t_list);
53
54 r2t->recovery_r2t = recovery;
55 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
56 r2t->offset = offset;
57 r2t->xfer_len = xfer_len;
58 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
59 spin_unlock_bh(&cmd->r2t_lock);
60
61 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
62
63 spin_lock_bh(&cmd->r2t_lock);
64 return 0;
65 }
66
iscsit_get_r2t_for_eos(struct iscsit_cmd * cmd,u32 offset,u32 length)67 struct iscsi_r2t *iscsit_get_r2t_for_eos(
68 struct iscsit_cmd *cmd,
69 u32 offset,
70 u32 length)
71 {
72 struct iscsi_r2t *r2t;
73
74 spin_lock_bh(&cmd->r2t_lock);
75 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
76 if ((r2t->offset <= offset) &&
77 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
78 spin_unlock_bh(&cmd->r2t_lock);
79 return r2t;
80 }
81 }
82 spin_unlock_bh(&cmd->r2t_lock);
83
84 pr_err("Unable to locate R2T for Offset: %u, Length:"
85 " %u\n", offset, length);
86 return NULL;
87 }
88
iscsit_get_r2t_from_list(struct iscsit_cmd * cmd)89 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsit_cmd *cmd)
90 {
91 struct iscsi_r2t *r2t;
92
93 spin_lock_bh(&cmd->r2t_lock);
94 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
95 if (!r2t->sent_r2t) {
96 spin_unlock_bh(&cmd->r2t_lock);
97 return r2t;
98 }
99 }
100 spin_unlock_bh(&cmd->r2t_lock);
101
102 pr_err("Unable to locate next R2T to send for ITT:"
103 " 0x%08x.\n", cmd->init_task_tag);
104 return NULL;
105 }
106
iscsit_free_r2t(struct iscsi_r2t * r2t,struct iscsit_cmd * cmd)107 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsit_cmd *cmd)
108 {
109 lockdep_assert_held(&cmd->r2t_lock);
110
111 list_del(&r2t->r2t_list);
112 kmem_cache_free(lio_r2t_cache, r2t);
113 }
114
iscsit_free_r2ts_from_list(struct iscsit_cmd * cmd)115 void iscsit_free_r2ts_from_list(struct iscsit_cmd *cmd)
116 {
117 struct iscsi_r2t *r2t, *r2t_tmp;
118
119 spin_lock_bh(&cmd->r2t_lock);
120 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
121 iscsit_free_r2t(r2t, cmd);
122 spin_unlock_bh(&cmd->r2t_lock);
123 }
124
iscsit_wait_for_tag(struct se_session * se_sess,int state,int * cpup)125 static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
126 {
127 int tag = -1;
128 DEFINE_SBQ_WAIT(wait);
129 struct sbq_wait_state *ws;
130 struct sbitmap_queue *sbq;
131
132 if (state == TASK_RUNNING)
133 return tag;
134
135 sbq = &se_sess->sess_tag_pool;
136 ws = &sbq->ws[0];
137 for (;;) {
138 sbitmap_prepare_to_wait(sbq, ws, &wait, state);
139 if (signal_pending_state(state, current))
140 break;
141 tag = sbitmap_queue_get(sbq, cpup);
142 if (tag >= 0)
143 break;
144 schedule();
145 }
146
147 sbitmap_finish_wait(sbq, ws, &wait);
148 return tag;
149 }
150
151 /*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
iscsit_allocate_cmd(struct iscsit_conn * conn,int state)155 struct iscsit_cmd *iscsit_allocate_cmd(struct iscsit_conn *conn, int state)
156 {
157 struct iscsit_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag, cpu;
160
161 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
162 if (tag < 0)
163 tag = iscsit_wait_for_tag(se_sess, state, &cpu);
164 if (tag < 0)
165 return NULL;
166
167 size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size;
168 cmd = (struct iscsit_cmd *)(se_sess->sess_cmd_map + (tag * size));
169 memset(cmd, 0, size);
170
171 cmd->se_cmd.map_tag = tag;
172 cmd->se_cmd.map_cpu = cpu;
173 cmd->conn = conn;
174 cmd->data_direction = DMA_NONE;
175 INIT_LIST_HEAD(&cmd->i_conn_node);
176 INIT_LIST_HEAD(&cmd->datain_list);
177 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
178 spin_lock_init(&cmd->datain_lock);
179 spin_lock_init(&cmd->dataout_timeout_lock);
180 spin_lock_init(&cmd->istate_lock);
181 spin_lock_init(&cmd->error_lock);
182 spin_lock_init(&cmd->r2t_lock);
183 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
184
185 return cmd;
186 }
187 EXPORT_SYMBOL(iscsit_allocate_cmd);
188
iscsit_get_seq_holder_for_datain(struct iscsit_cmd * cmd,u32 seq_send_order)189 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
190 struct iscsit_cmd *cmd,
191 u32 seq_send_order)
192 {
193 u32 i;
194
195 for (i = 0; i < cmd->seq_count; i++)
196 if (cmd->seq_list[i].seq_send_order == seq_send_order)
197 return &cmd->seq_list[i];
198
199 return NULL;
200 }
201
iscsit_get_seq_holder_for_r2t(struct iscsit_cmd * cmd)202 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsit_cmd *cmd)
203 {
204 u32 i;
205
206 if (!cmd->seq_list) {
207 pr_err("struct iscsit_cmd->seq_list is NULL!\n");
208 return NULL;
209 }
210
211 for (i = 0; i < cmd->seq_count; i++) {
212 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
213 continue;
214 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
215 cmd->seq_send_order++;
216 return &cmd->seq_list[i];
217 }
218 }
219
220 return NULL;
221 }
222
iscsit_get_holder_for_r2tsn(struct iscsit_cmd * cmd,u32 r2t_sn)223 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
224 struct iscsit_cmd *cmd,
225 u32 r2t_sn)
226 {
227 struct iscsi_r2t *r2t;
228
229 spin_lock_bh(&cmd->r2t_lock);
230 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
231 if (r2t->r2t_sn == r2t_sn) {
232 spin_unlock_bh(&cmd->r2t_lock);
233 return r2t;
234 }
235 }
236 spin_unlock_bh(&cmd->r2t_lock);
237
238 return NULL;
239 }
240
iscsit_check_received_cmdsn(struct iscsit_session * sess,u32 cmdsn)241 static inline int iscsit_check_received_cmdsn(struct iscsit_session *sess, u32 cmdsn)
242 {
243 u32 max_cmdsn;
244 int ret;
245
246 /*
247 * This is the proper method of checking received CmdSN against
248 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
249 * or order CmdSNs due to multiple connection sessions and/or
250 * CRC failures.
251 */
252 max_cmdsn = atomic_read(&sess->max_cmd_sn);
253 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
254 pr_err("Received CmdSN: 0x%08x is greater than"
255 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
256 ret = CMDSN_MAXCMDSN_OVERRUN;
257
258 } else if (cmdsn == sess->exp_cmd_sn) {
259 sess->exp_cmd_sn++;
260 pr_debug("Received CmdSN matches ExpCmdSN,"
261 " incremented ExpCmdSN to: 0x%08x\n",
262 sess->exp_cmd_sn);
263 ret = CMDSN_NORMAL_OPERATION;
264
265 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
266 pr_debug("Received CmdSN: 0x%08x is greater"
267 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
268 cmdsn, sess->exp_cmd_sn);
269 ret = CMDSN_HIGHER_THAN_EXP;
270
271 } else {
272 pr_err("Received CmdSN: 0x%08x is less than"
273 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
274 sess->exp_cmd_sn);
275 ret = CMDSN_LOWER_THAN_EXP;
276 }
277
278 return ret;
279 }
280
281 /*
282 * Commands may be received out of order if MC/S is in use.
283 * Ensure they are executed in CmdSN order.
284 */
iscsit_sequence_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf,__be32 cmdsn)285 int iscsit_sequence_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
286 unsigned char *buf, __be32 cmdsn)
287 {
288 int ret, cmdsn_ret;
289 bool reject = false;
290 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
291
292 mutex_lock(&conn->sess->cmdsn_mutex);
293
294 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
295 switch (cmdsn_ret) {
296 case CMDSN_NORMAL_OPERATION:
297 ret = iscsit_execute_cmd(cmd, 0);
298 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
299 iscsit_execute_ooo_cmdsns(conn->sess);
300 else if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 }
304 break;
305 case CMDSN_HIGHER_THAN_EXP:
306 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
307 if (ret < 0) {
308 reject = true;
309 ret = CMDSN_ERROR_CANNOT_RECOVER;
310 break;
311 }
312 ret = CMDSN_HIGHER_THAN_EXP;
313 break;
314 case CMDSN_LOWER_THAN_EXP:
315 case CMDSN_MAXCMDSN_OVERRUN:
316 default:
317 cmd->i_state = ISTATE_REMOVE;
318 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
319 /*
320 * Existing callers for iscsit_sequence_cmd() will silently
321 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
322 * return for CMDSN_MAXCMDSN_OVERRUN as well..
323 */
324 ret = CMDSN_LOWER_THAN_EXP;
325 break;
326 }
327 mutex_unlock(&conn->sess->cmdsn_mutex);
328
329 if (reject)
330 iscsit_reject_cmd(cmd, reason, buf);
331
332 return ret;
333 }
334 EXPORT_SYMBOL(iscsit_sequence_cmd);
335
iscsit_check_unsolicited_dataout(struct iscsit_cmd * cmd,unsigned char * buf)336 int iscsit_check_unsolicited_dataout(struct iscsit_cmd *cmd, unsigned char *buf)
337 {
338 struct iscsit_conn *conn = cmd->conn;
339 struct se_cmd *se_cmd = &cmd->se_cmd;
340 struct iscsi_data *hdr = (struct iscsi_data *) buf;
341 u32 payload_length = ntoh24(hdr->dlength);
342
343 if (conn->sess->sess_ops->InitialR2T) {
344 pr_err("Received unexpected unsolicited data"
345 " while InitialR2T=Yes, protocol error.\n");
346 transport_send_check_condition_and_sense(se_cmd,
347 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
348 return -1;
349 }
350
351 if ((cmd->first_burst_len + payload_length) >
352 conn->sess->sess_ops->FirstBurstLength) {
353 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
354 " for this Unsolicited DataOut Burst.\n",
355 (cmd->first_burst_len + payload_length),
356 conn->sess->sess_ops->FirstBurstLength);
357 transport_send_check_condition_and_sense(se_cmd,
358 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
359 return -1;
360 }
361
362 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
363 return 0;
364
365 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
366 ((cmd->first_burst_len + payload_length) !=
367 conn->sess->sess_ops->FirstBurstLength)) {
368 pr_err("Unsolicited non-immediate data received %u"
369 " does not equal FirstBurstLength: %u, and does"
370 " not equal ExpXferLen %u.\n",
371 (cmd->first_burst_len + payload_length),
372 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
373 transport_send_check_condition_and_sense(se_cmd,
374 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
375 return -1;
376 }
377 return 0;
378 }
379
iscsit_find_cmd_from_itt(struct iscsit_conn * conn,itt_t init_task_tag)380 struct iscsit_cmd *iscsit_find_cmd_from_itt(
381 struct iscsit_conn *conn,
382 itt_t init_task_tag)
383 {
384 struct iscsit_cmd *cmd;
385
386 spin_lock_bh(&conn->cmd_lock);
387 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
388 if (cmd->init_task_tag == init_task_tag) {
389 spin_unlock_bh(&conn->cmd_lock);
390 return cmd;
391 }
392 }
393 spin_unlock_bh(&conn->cmd_lock);
394
395 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
396 init_task_tag, conn->cid);
397 return NULL;
398 }
399 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
400
iscsit_find_cmd_from_itt_or_dump(struct iscsit_conn * conn,itt_t init_task_tag,u32 length)401 struct iscsit_cmd *iscsit_find_cmd_from_itt_or_dump(
402 struct iscsit_conn *conn,
403 itt_t init_task_tag,
404 u32 length)
405 {
406 struct iscsit_cmd *cmd;
407
408 spin_lock_bh(&conn->cmd_lock);
409 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
410 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
411 continue;
412 if (cmd->init_task_tag == init_task_tag) {
413 spin_unlock_bh(&conn->cmd_lock);
414 return cmd;
415 }
416 }
417 spin_unlock_bh(&conn->cmd_lock);
418
419 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
420 " dumping payload\n", init_task_tag, conn->cid);
421 if (length)
422 iscsit_dump_data_payload(conn, length, 1);
423
424 return NULL;
425 }
426 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
427
iscsit_find_cmd_from_ttt(struct iscsit_conn * conn,u32 targ_xfer_tag)428 struct iscsit_cmd *iscsit_find_cmd_from_ttt(
429 struct iscsit_conn *conn,
430 u32 targ_xfer_tag)
431 {
432 struct iscsit_cmd *cmd = NULL;
433
434 spin_lock_bh(&conn->cmd_lock);
435 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
436 if (cmd->targ_xfer_tag == targ_xfer_tag) {
437 spin_unlock_bh(&conn->cmd_lock);
438 return cmd;
439 }
440 }
441 spin_unlock_bh(&conn->cmd_lock);
442
443 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
444 targ_xfer_tag, conn->cid);
445 return NULL;
446 }
447
iscsit_find_cmd_for_recovery(struct iscsit_session * sess,struct iscsit_cmd ** cmd_ptr,struct iscsi_conn_recovery ** cr_ptr,itt_t init_task_tag)448 int iscsit_find_cmd_for_recovery(
449 struct iscsit_session *sess,
450 struct iscsit_cmd **cmd_ptr,
451 struct iscsi_conn_recovery **cr_ptr,
452 itt_t init_task_tag)
453 {
454 struct iscsit_cmd *cmd = NULL;
455 struct iscsi_conn_recovery *cr;
456 /*
457 * Scan through the inactive connection recovery list's command list.
458 * If init_task_tag matches the command is still alligent.
459 */
460 spin_lock(&sess->cr_i_lock);
461 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
462 spin_lock(&cr->conn_recovery_cmd_lock);
463 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
464 if (cmd->init_task_tag == init_task_tag) {
465 spin_unlock(&cr->conn_recovery_cmd_lock);
466 spin_unlock(&sess->cr_i_lock);
467
468 *cr_ptr = cr;
469 *cmd_ptr = cmd;
470 return -2;
471 }
472 }
473 spin_unlock(&cr->conn_recovery_cmd_lock);
474 }
475 spin_unlock(&sess->cr_i_lock);
476 /*
477 * Scan through the active connection recovery list's command list.
478 * If init_task_tag matches the command is ready to be reassigned.
479 */
480 spin_lock(&sess->cr_a_lock);
481 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
482 spin_lock(&cr->conn_recovery_cmd_lock);
483 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
484 if (cmd->init_task_tag == init_task_tag) {
485 spin_unlock(&cr->conn_recovery_cmd_lock);
486 spin_unlock(&sess->cr_a_lock);
487
488 *cr_ptr = cr;
489 *cmd_ptr = cmd;
490 return 0;
491 }
492 }
493 spin_unlock(&cr->conn_recovery_cmd_lock);
494 }
495 spin_unlock(&sess->cr_a_lock);
496
497 return -1;
498 }
499
iscsit_add_cmd_to_immediate_queue(struct iscsit_cmd * cmd,struct iscsit_conn * conn,u8 state)500 void iscsit_add_cmd_to_immediate_queue(
501 struct iscsit_cmd *cmd,
502 struct iscsit_conn *conn,
503 u8 state)
504 {
505 struct iscsi_queue_req *qr;
506
507 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
508 if (!qr) {
509 pr_err("Unable to allocate memory for"
510 " struct iscsi_queue_req\n");
511 return;
512 }
513 INIT_LIST_HEAD(&qr->qr_list);
514 qr->cmd = cmd;
515 qr->state = state;
516
517 spin_lock_bh(&conn->immed_queue_lock);
518 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
519 atomic_inc(&cmd->immed_queue_count);
520 atomic_set(&conn->check_immediate_queue, 1);
521 spin_unlock_bh(&conn->immed_queue_lock);
522
523 wake_up(&conn->queues_wq);
524 }
525 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
526
iscsit_get_cmd_from_immediate_queue(struct iscsit_conn * conn)527 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsit_conn *conn)
528 {
529 struct iscsi_queue_req *qr;
530
531 spin_lock_bh(&conn->immed_queue_lock);
532 if (list_empty(&conn->immed_queue_list)) {
533 spin_unlock_bh(&conn->immed_queue_lock);
534 return NULL;
535 }
536 qr = list_first_entry(&conn->immed_queue_list,
537 struct iscsi_queue_req, qr_list);
538
539 list_del(&qr->qr_list);
540 if (qr->cmd)
541 atomic_dec(&qr->cmd->immed_queue_count);
542 spin_unlock_bh(&conn->immed_queue_lock);
543
544 return qr;
545 }
546
iscsit_remove_cmd_from_immediate_queue(struct iscsit_cmd * cmd,struct iscsit_conn * conn)547 static void iscsit_remove_cmd_from_immediate_queue(
548 struct iscsit_cmd *cmd,
549 struct iscsit_conn *conn)
550 {
551 struct iscsi_queue_req *qr, *qr_tmp;
552
553 spin_lock_bh(&conn->immed_queue_lock);
554 if (!atomic_read(&cmd->immed_queue_count)) {
555 spin_unlock_bh(&conn->immed_queue_lock);
556 return;
557 }
558
559 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
560 if (qr->cmd != cmd)
561 continue;
562
563 atomic_dec(&qr->cmd->immed_queue_count);
564 list_del(&qr->qr_list);
565 kmem_cache_free(lio_qr_cache, qr);
566 }
567 spin_unlock_bh(&conn->immed_queue_lock);
568
569 if (atomic_read(&cmd->immed_queue_count)) {
570 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
571 cmd->init_task_tag,
572 atomic_read(&cmd->immed_queue_count));
573 }
574 }
575
iscsit_add_cmd_to_response_queue(struct iscsit_cmd * cmd,struct iscsit_conn * conn,u8 state)576 int iscsit_add_cmd_to_response_queue(
577 struct iscsit_cmd *cmd,
578 struct iscsit_conn *conn,
579 u8 state)
580 {
581 struct iscsi_queue_req *qr;
582
583 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
584 if (!qr) {
585 pr_err("Unable to allocate memory for"
586 " struct iscsi_queue_req\n");
587 return -ENOMEM;
588 }
589 INIT_LIST_HEAD(&qr->qr_list);
590 qr->cmd = cmd;
591 qr->state = state;
592
593 spin_lock_bh(&conn->response_queue_lock);
594 list_add_tail(&qr->qr_list, &conn->response_queue_list);
595 atomic_inc(&cmd->response_queue_count);
596 spin_unlock_bh(&conn->response_queue_lock);
597
598 wake_up(&conn->queues_wq);
599 return 0;
600 }
601
iscsit_get_cmd_from_response_queue(struct iscsit_conn * conn)602 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsit_conn *conn)
603 {
604 struct iscsi_queue_req *qr;
605
606 spin_lock_bh(&conn->response_queue_lock);
607 if (list_empty(&conn->response_queue_list)) {
608 spin_unlock_bh(&conn->response_queue_lock);
609 return NULL;
610 }
611
612 qr = list_first_entry(&conn->response_queue_list,
613 struct iscsi_queue_req, qr_list);
614
615 list_del(&qr->qr_list);
616 if (qr->cmd)
617 atomic_dec(&qr->cmd->response_queue_count);
618 spin_unlock_bh(&conn->response_queue_lock);
619
620 return qr;
621 }
622
iscsit_remove_cmd_from_response_queue(struct iscsit_cmd * cmd,struct iscsit_conn * conn)623 static void iscsit_remove_cmd_from_response_queue(
624 struct iscsit_cmd *cmd,
625 struct iscsit_conn *conn)
626 {
627 struct iscsi_queue_req *qr, *qr_tmp;
628
629 spin_lock_bh(&conn->response_queue_lock);
630 if (!atomic_read(&cmd->response_queue_count)) {
631 spin_unlock_bh(&conn->response_queue_lock);
632 return;
633 }
634
635 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
636 qr_list) {
637 if (qr->cmd != cmd)
638 continue;
639
640 atomic_dec(&qr->cmd->response_queue_count);
641 list_del(&qr->qr_list);
642 kmem_cache_free(lio_qr_cache, qr);
643 }
644 spin_unlock_bh(&conn->response_queue_lock);
645
646 if (atomic_read(&cmd->response_queue_count)) {
647 pr_err("ITT: 0x%08x response_queue_count: %d\n",
648 cmd->init_task_tag,
649 atomic_read(&cmd->response_queue_count));
650 }
651 }
652
iscsit_conn_all_queues_empty(struct iscsit_conn * conn)653 bool iscsit_conn_all_queues_empty(struct iscsit_conn *conn)
654 {
655 bool empty;
656
657 spin_lock_bh(&conn->immed_queue_lock);
658 empty = list_empty(&conn->immed_queue_list);
659 spin_unlock_bh(&conn->immed_queue_lock);
660
661 if (!empty)
662 return empty;
663
664 spin_lock_bh(&conn->response_queue_lock);
665 empty = list_empty(&conn->response_queue_list);
666 spin_unlock_bh(&conn->response_queue_lock);
667
668 return empty;
669 }
670
iscsit_free_queue_reqs_for_conn(struct iscsit_conn * conn)671 void iscsit_free_queue_reqs_for_conn(struct iscsit_conn *conn)
672 {
673 struct iscsi_queue_req *qr, *qr_tmp;
674
675 spin_lock_bh(&conn->immed_queue_lock);
676 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
677 list_del(&qr->qr_list);
678 if (qr->cmd)
679 atomic_dec(&qr->cmd->immed_queue_count);
680
681 kmem_cache_free(lio_qr_cache, qr);
682 }
683 spin_unlock_bh(&conn->immed_queue_lock);
684
685 spin_lock_bh(&conn->response_queue_lock);
686 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
687 qr_list) {
688 list_del(&qr->qr_list);
689 if (qr->cmd)
690 atomic_dec(&qr->cmd->response_queue_count);
691
692 kmem_cache_free(lio_qr_cache, qr);
693 }
694 spin_unlock_bh(&conn->response_queue_lock);
695 }
696
iscsit_release_cmd(struct iscsit_cmd * cmd)697 void iscsit_release_cmd(struct iscsit_cmd *cmd)
698 {
699 struct iscsit_session *sess;
700 struct se_cmd *se_cmd = &cmd->se_cmd;
701
702 WARN_ON(!list_empty(&cmd->i_conn_node));
703
704 if (cmd->conn)
705 sess = cmd->conn->sess;
706 else
707 sess = cmd->sess;
708
709 BUG_ON(!sess || !sess->se_sess);
710
711 kfree(cmd->buf_ptr);
712 kfree(cmd->pdu_list);
713 kfree(cmd->seq_list);
714 kfree(cmd->tmr_req);
715 kfree(cmd->overflow_buf);
716 kfree(cmd->iov_data);
717 kfree(cmd->text_in_ptr);
718
719 target_free_tag(sess->se_sess, se_cmd);
720 }
721 EXPORT_SYMBOL(iscsit_release_cmd);
722
__iscsit_free_cmd(struct iscsit_cmd * cmd,bool check_queues)723 void __iscsit_free_cmd(struct iscsit_cmd *cmd, bool check_queues)
724 {
725 struct iscsit_conn *conn = cmd->conn;
726
727 WARN_ON(!list_empty(&cmd->i_conn_node));
728
729 if (cmd->data_direction == DMA_TO_DEVICE) {
730 iscsit_stop_dataout_timer(cmd);
731 iscsit_free_r2ts_from_list(cmd);
732 }
733 if (cmd->data_direction == DMA_FROM_DEVICE)
734 iscsit_free_all_datain_reqs(cmd);
735
736 if (conn && check_queues) {
737 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
738 iscsit_remove_cmd_from_response_queue(cmd, conn);
739 }
740
741 if (conn && conn->conn_transport->iscsit_unmap_cmd)
742 conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
743 }
744
iscsit_free_cmd(struct iscsit_cmd * cmd,bool shutdown)745 void iscsit_free_cmd(struct iscsit_cmd *cmd, bool shutdown)
746 {
747 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
748 int rc;
749
750 WARN_ON(!list_empty(&cmd->i_conn_node));
751
752 __iscsit_free_cmd(cmd, shutdown);
753 if (se_cmd) {
754 rc = transport_generic_free_cmd(se_cmd, shutdown);
755 if (!rc && shutdown && se_cmd->se_sess) {
756 __iscsit_free_cmd(cmd, shutdown);
757 target_put_sess_cmd(se_cmd);
758 }
759 } else {
760 iscsit_release_cmd(cmd);
761 }
762 }
763 EXPORT_SYMBOL(iscsit_free_cmd);
764
iscsit_check_session_usage_count(struct iscsit_session * sess,bool can_sleep)765 bool iscsit_check_session_usage_count(struct iscsit_session *sess,
766 bool can_sleep)
767 {
768 spin_lock_bh(&sess->session_usage_lock);
769 if (sess->session_usage_count != 0) {
770 sess->session_waiting_on_uc = 1;
771 spin_unlock_bh(&sess->session_usage_lock);
772 if (!can_sleep)
773 return true;
774
775 wait_for_completion(&sess->session_waiting_on_uc_comp);
776 return false;
777 }
778 spin_unlock_bh(&sess->session_usage_lock);
779
780 return false;
781 }
782
iscsit_dec_session_usage_count(struct iscsit_session * sess)783 void iscsit_dec_session_usage_count(struct iscsit_session *sess)
784 {
785 spin_lock_bh(&sess->session_usage_lock);
786 sess->session_usage_count--;
787
788 if (!sess->session_usage_count && sess->session_waiting_on_uc)
789 complete(&sess->session_waiting_on_uc_comp);
790
791 spin_unlock_bh(&sess->session_usage_lock);
792 }
793
iscsit_inc_session_usage_count(struct iscsit_session * sess)794 void iscsit_inc_session_usage_count(struct iscsit_session *sess)
795 {
796 spin_lock_bh(&sess->session_usage_lock);
797 sess->session_usage_count++;
798 spin_unlock_bh(&sess->session_usage_lock);
799 }
800
iscsit_get_conn_from_cid(struct iscsit_session * sess,u16 cid)801 struct iscsit_conn *iscsit_get_conn_from_cid(struct iscsit_session *sess, u16 cid)
802 {
803 struct iscsit_conn *conn;
804
805 spin_lock_bh(&sess->conn_lock);
806 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
807 if ((conn->cid == cid) &&
808 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
809 iscsit_inc_conn_usage_count(conn);
810 spin_unlock_bh(&sess->conn_lock);
811 return conn;
812 }
813 }
814 spin_unlock_bh(&sess->conn_lock);
815
816 return NULL;
817 }
818
iscsit_get_conn_from_cid_rcfr(struct iscsit_session * sess,u16 cid)819 struct iscsit_conn *iscsit_get_conn_from_cid_rcfr(struct iscsit_session *sess, u16 cid)
820 {
821 struct iscsit_conn *conn;
822
823 spin_lock_bh(&sess->conn_lock);
824 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
825 if (conn->cid == cid) {
826 iscsit_inc_conn_usage_count(conn);
827 spin_lock(&conn->state_lock);
828 atomic_set(&conn->connection_wait_rcfr, 1);
829 spin_unlock(&conn->state_lock);
830 spin_unlock_bh(&sess->conn_lock);
831 return conn;
832 }
833 }
834 spin_unlock_bh(&sess->conn_lock);
835
836 return NULL;
837 }
838
iscsit_check_conn_usage_count(struct iscsit_conn * conn)839 void iscsit_check_conn_usage_count(struct iscsit_conn *conn)
840 {
841 spin_lock_bh(&conn->conn_usage_lock);
842 if (conn->conn_usage_count != 0) {
843 conn->conn_waiting_on_uc = 1;
844 spin_unlock_bh(&conn->conn_usage_lock);
845
846 wait_for_completion(&conn->conn_waiting_on_uc_comp);
847 return;
848 }
849 spin_unlock_bh(&conn->conn_usage_lock);
850 }
851
iscsit_dec_conn_usage_count(struct iscsit_conn * conn)852 void iscsit_dec_conn_usage_count(struct iscsit_conn *conn)
853 {
854 spin_lock_bh(&conn->conn_usage_lock);
855 conn->conn_usage_count--;
856
857 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
858 complete(&conn->conn_waiting_on_uc_comp);
859
860 spin_unlock_bh(&conn->conn_usage_lock);
861 }
862
iscsit_inc_conn_usage_count(struct iscsit_conn * conn)863 void iscsit_inc_conn_usage_count(struct iscsit_conn *conn)
864 {
865 spin_lock_bh(&conn->conn_usage_lock);
866 conn->conn_usage_count++;
867 spin_unlock_bh(&conn->conn_usage_lock);
868 }
869
iscsit_add_nopin(struct iscsit_conn * conn,int want_response)870 static int iscsit_add_nopin(struct iscsit_conn *conn, int want_response)
871 {
872 u8 state;
873 struct iscsit_cmd *cmd;
874
875 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
876 if (!cmd)
877 return -1;
878
879 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
880 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
881 ISTATE_SEND_NOPIN_NO_RESPONSE;
882 cmd->init_task_tag = RESERVED_ITT;
883 cmd->targ_xfer_tag = (want_response) ?
884 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
885 spin_lock_bh(&conn->cmd_lock);
886 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
887 spin_unlock_bh(&conn->cmd_lock);
888
889 if (want_response)
890 iscsit_start_nopin_response_timer(conn);
891 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
892
893 return 0;
894 }
895
iscsit_handle_nopin_response_timeout(struct timer_list * t)896 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
897 {
898 struct iscsit_conn *conn = from_timer(conn, t, nopin_response_timer);
899 struct iscsit_session *sess = conn->sess;
900
901 iscsit_inc_conn_usage_count(conn);
902
903 spin_lock_bh(&conn->nopin_timer_lock);
904 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
905 spin_unlock_bh(&conn->nopin_timer_lock);
906 iscsit_dec_conn_usage_count(conn);
907 return;
908 }
909
910 pr_err("Did not receive response to NOPIN on CID: %hu, failing"
911 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
912 conn->cid, sess->sess_ops->InitiatorName, sess->isid,
913 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
914 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
915 spin_unlock_bh(&conn->nopin_timer_lock);
916
917 iscsit_fill_cxn_timeout_err_stats(sess);
918 iscsit_cause_connection_reinstatement(conn, 0);
919 iscsit_dec_conn_usage_count(conn);
920 }
921
iscsit_mod_nopin_response_timer(struct iscsit_conn * conn)922 void iscsit_mod_nopin_response_timer(struct iscsit_conn *conn)
923 {
924 struct iscsit_session *sess = conn->sess;
925 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
926
927 spin_lock_bh(&conn->nopin_timer_lock);
928 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
929 spin_unlock_bh(&conn->nopin_timer_lock);
930 return;
931 }
932
933 mod_timer(&conn->nopin_response_timer,
934 (get_jiffies_64() + na->nopin_response_timeout * HZ));
935 spin_unlock_bh(&conn->nopin_timer_lock);
936 }
937
iscsit_start_nopin_response_timer(struct iscsit_conn * conn)938 void iscsit_start_nopin_response_timer(struct iscsit_conn *conn)
939 {
940 struct iscsit_session *sess = conn->sess;
941 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
942
943 spin_lock_bh(&conn->nopin_timer_lock);
944 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
945 spin_unlock_bh(&conn->nopin_timer_lock);
946 return;
947 }
948
949 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
950 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
951 mod_timer(&conn->nopin_response_timer,
952 jiffies + na->nopin_response_timeout * HZ);
953
954 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
955 " seconds\n", conn->cid, na->nopin_response_timeout);
956 spin_unlock_bh(&conn->nopin_timer_lock);
957 }
958
iscsit_stop_nopin_response_timer(struct iscsit_conn * conn)959 void iscsit_stop_nopin_response_timer(struct iscsit_conn *conn)
960 {
961 spin_lock_bh(&conn->nopin_timer_lock);
962 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
963 spin_unlock_bh(&conn->nopin_timer_lock);
964 return;
965 }
966 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
967 spin_unlock_bh(&conn->nopin_timer_lock);
968
969 del_timer_sync(&conn->nopin_response_timer);
970
971 spin_lock_bh(&conn->nopin_timer_lock);
972 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
973 spin_unlock_bh(&conn->nopin_timer_lock);
974 }
975
iscsit_handle_nopin_timeout(struct timer_list * t)976 void iscsit_handle_nopin_timeout(struct timer_list *t)
977 {
978 struct iscsit_conn *conn = from_timer(conn, t, nopin_timer);
979
980 iscsit_inc_conn_usage_count(conn);
981
982 spin_lock_bh(&conn->nopin_timer_lock);
983 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
984 spin_unlock_bh(&conn->nopin_timer_lock);
985 iscsit_dec_conn_usage_count(conn);
986 return;
987 }
988 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
989 spin_unlock_bh(&conn->nopin_timer_lock);
990
991 iscsit_add_nopin(conn, 1);
992 iscsit_dec_conn_usage_count(conn);
993 }
994
__iscsit_start_nopin_timer(struct iscsit_conn * conn)995 void __iscsit_start_nopin_timer(struct iscsit_conn *conn)
996 {
997 struct iscsit_session *sess = conn->sess;
998 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
999
1000 lockdep_assert_held(&conn->nopin_timer_lock);
1001
1002 /*
1003 * NOPIN timeout is disabled.
1004 */
1005 if (!na->nopin_timeout)
1006 return;
1007
1008 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1009 return;
1010
1011 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1012 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1013 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1014
1015 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1016 " interval\n", conn->cid, na->nopin_timeout);
1017 }
1018
iscsit_start_nopin_timer(struct iscsit_conn * conn)1019 void iscsit_start_nopin_timer(struct iscsit_conn *conn)
1020 {
1021 spin_lock_bh(&conn->nopin_timer_lock);
1022 __iscsit_start_nopin_timer(conn);
1023 spin_unlock_bh(&conn->nopin_timer_lock);
1024 }
1025
iscsit_stop_nopin_timer(struct iscsit_conn * conn)1026 void iscsit_stop_nopin_timer(struct iscsit_conn *conn)
1027 {
1028 spin_lock_bh(&conn->nopin_timer_lock);
1029 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1030 spin_unlock_bh(&conn->nopin_timer_lock);
1031 return;
1032 }
1033 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1034 spin_unlock_bh(&conn->nopin_timer_lock);
1035
1036 del_timer_sync(&conn->nopin_timer);
1037
1038 spin_lock_bh(&conn->nopin_timer_lock);
1039 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1041 }
1042
iscsit_login_timeout(struct timer_list * t)1043 void iscsit_login_timeout(struct timer_list *t)
1044 {
1045 struct iscsit_conn *conn = from_timer(conn, t, login_timer);
1046 struct iscsi_login *login = conn->login;
1047
1048 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
1049
1050 spin_lock_bh(&conn->login_timer_lock);
1051 login->login_failed = 1;
1052
1053 if (conn->login_kworker) {
1054 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
1055 conn->login_kworker->comm, conn->login_kworker->pid);
1056 send_sig(SIGINT, conn->login_kworker, 1);
1057 } else {
1058 schedule_delayed_work(&conn->login_work, 0);
1059 }
1060 spin_unlock_bh(&conn->login_timer_lock);
1061 }
1062
iscsit_start_login_timer(struct iscsit_conn * conn,struct task_struct * kthr)1063 void iscsit_start_login_timer(struct iscsit_conn *conn, struct task_struct *kthr)
1064 {
1065 pr_debug("Login timer started\n");
1066
1067 conn->login_kworker = kthr;
1068 mod_timer(&conn->login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
1069 }
1070
iscsit_set_login_timer_kworker(struct iscsit_conn * conn,struct task_struct * kthr)1071 int iscsit_set_login_timer_kworker(struct iscsit_conn *conn, struct task_struct *kthr)
1072 {
1073 struct iscsi_login *login = conn->login;
1074 int ret = 0;
1075
1076 spin_lock_bh(&conn->login_timer_lock);
1077 if (login->login_failed) {
1078 /* The timer has already expired */
1079 ret = -1;
1080 } else {
1081 conn->login_kworker = kthr;
1082 }
1083 spin_unlock_bh(&conn->login_timer_lock);
1084
1085 return ret;
1086 }
1087
iscsit_stop_login_timer(struct iscsit_conn * conn)1088 void iscsit_stop_login_timer(struct iscsit_conn *conn)
1089 {
1090 pr_debug("Login timer stopped\n");
1091 timer_delete_sync(&conn->login_timer);
1092 }
1093
iscsit_send_tx_data(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int use_misc)1094 int iscsit_send_tx_data(
1095 struct iscsit_cmd *cmd,
1096 struct iscsit_conn *conn,
1097 int use_misc)
1098 {
1099 int tx_sent, tx_size;
1100 u32 iov_count;
1101 struct kvec *iov;
1102
1103 send_data:
1104 tx_size = cmd->tx_size;
1105
1106 if (!use_misc) {
1107 iov = &cmd->iov_data[0];
1108 iov_count = cmd->iov_data_count;
1109 } else {
1110 iov = &cmd->iov_misc[0];
1111 iov_count = cmd->iov_misc_count;
1112 }
1113
1114 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1115 if (tx_size != tx_sent) {
1116 if (tx_sent == -EAGAIN) {
1117 pr_err("tx_data() returned -EAGAIN\n");
1118 goto send_data;
1119 } else
1120 return -1;
1121 }
1122 cmd->tx_size = 0;
1123
1124 return 0;
1125 }
1126
iscsit_fe_sendpage_sg(struct iscsit_cmd * cmd,struct iscsit_conn * conn)1127 int iscsit_fe_sendpage_sg(
1128 struct iscsit_cmd *cmd,
1129 struct iscsit_conn *conn)
1130 {
1131 struct scatterlist *sg = cmd->first_data_sg;
1132 struct bio_vec bvec;
1133 struct msghdr msghdr = { .msg_flags = MSG_SPLICE_PAGES, };
1134 struct kvec iov;
1135 u32 tx_hdr_size, data_len;
1136 u32 offset = cmd->first_data_sg_off;
1137 int tx_sent, iov_off;
1138
1139 send_hdr:
1140 tx_hdr_size = ISCSI_HDR_LEN;
1141 if (conn->conn_ops->HeaderDigest)
1142 tx_hdr_size += ISCSI_CRC_LEN;
1143
1144 iov.iov_base = cmd->pdu;
1145 iov.iov_len = tx_hdr_size;
1146
1147 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1148 if (tx_hdr_size != tx_sent) {
1149 if (tx_sent == -EAGAIN) {
1150 pr_err("tx_data() returned -EAGAIN\n");
1151 goto send_hdr;
1152 }
1153 return -1;
1154 }
1155
1156 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1157 /*
1158 * Set iov_off used by padding and data digest tx_data() calls below
1159 * in order to determine proper offset into cmd->iov_data[]
1160 */
1161 if (conn->conn_ops->DataDigest) {
1162 data_len -= ISCSI_CRC_LEN;
1163 if (cmd->padding)
1164 iov_off = (cmd->iov_data_count - 2);
1165 else
1166 iov_off = (cmd->iov_data_count - 1);
1167 } else {
1168 iov_off = (cmd->iov_data_count - 1);
1169 }
1170 /*
1171 * Perform sendpage() for each page in the scatterlist
1172 */
1173 while (data_len) {
1174 u32 space = (sg->length - offset);
1175 u32 sub_len = min_t(u32, data_len, space);
1176 send_pg:
1177 bvec_set_page(&bvec, sg_page(sg), sub_len, sg->offset + offset);
1178 iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, sub_len);
1179
1180 tx_sent = conn->sock->ops->sendmsg(conn->sock, &msghdr,
1181 sub_len);
1182 if (tx_sent != sub_len) {
1183 if (tx_sent == -EAGAIN) {
1184 pr_err("sendmsg/splice returned -EAGAIN\n");
1185 goto send_pg;
1186 }
1187
1188 pr_err("sendmsg/splice failure: %d\n", tx_sent);
1189 return -1;
1190 }
1191
1192 data_len -= sub_len;
1193 offset = 0;
1194 sg = sg_next(sg);
1195 }
1196
1197 send_padding:
1198 if (cmd->padding) {
1199 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1200
1201 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1202 if (cmd->padding != tx_sent) {
1203 if (tx_sent == -EAGAIN) {
1204 pr_err("tx_data() returned -EAGAIN\n");
1205 goto send_padding;
1206 }
1207 return -1;
1208 }
1209 }
1210
1211 send_datacrc:
1212 if (conn->conn_ops->DataDigest) {
1213 struct kvec *iov_d = &cmd->iov_data[iov_off];
1214
1215 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1216 if (ISCSI_CRC_LEN != tx_sent) {
1217 if (tx_sent == -EAGAIN) {
1218 pr_err("tx_data() returned -EAGAIN\n");
1219 goto send_datacrc;
1220 }
1221 return -1;
1222 }
1223 }
1224
1225 return 0;
1226 }
1227
1228 /*
1229 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1230 * back to the Initiator when an expection condition occurs with the
1231 * errors set in status_class and status_detail.
1232 *
1233 * Parameters: iSCSI Connection, Status Class, Status Detail.
1234 * Returns: 0 on success, -1 on error.
1235 */
iscsit_tx_login_rsp(struct iscsit_conn * conn,u8 status_class,u8 status_detail)1236 int iscsit_tx_login_rsp(struct iscsit_conn *conn, u8 status_class, u8 status_detail)
1237 {
1238 struct iscsi_login_rsp *hdr;
1239 struct iscsi_login *login = conn->conn_login;
1240
1241 login->login_failed = 1;
1242 iscsit_collect_login_stats(conn, status_class, status_detail);
1243
1244 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1245
1246 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1247 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1248 hdr->status_class = status_class;
1249 hdr->status_detail = status_detail;
1250 hdr->itt = conn->login_itt;
1251
1252 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1253 }
1254
iscsit_print_session_params(struct iscsit_session * sess)1255 void iscsit_print_session_params(struct iscsit_session *sess)
1256 {
1257 struct iscsit_conn *conn;
1258
1259 pr_debug("-----------------------------[Session Params for"
1260 " SID: %u]-----------------------------\n", sess->sid);
1261 spin_lock_bh(&sess->conn_lock);
1262 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1263 iscsi_dump_conn_ops(conn->conn_ops);
1264 spin_unlock_bh(&sess->conn_lock);
1265
1266 iscsi_dump_sess_ops(sess->sess_ops);
1267 }
1268
rx_data(struct iscsit_conn * conn,struct kvec * iov,int iov_count,int data)1269 int rx_data(
1270 struct iscsit_conn *conn,
1271 struct kvec *iov,
1272 int iov_count,
1273 int data)
1274 {
1275 int rx_loop = 0, total_rx = 0;
1276 struct msghdr msg;
1277
1278 if (!conn || !conn->sock || !conn->conn_ops)
1279 return -1;
1280
1281 memset(&msg, 0, sizeof(struct msghdr));
1282 iov_iter_kvec(&msg.msg_iter, ITER_DEST, iov, iov_count, data);
1283
1284 while (msg_data_left(&msg)) {
1285 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1286 if (rx_loop <= 0) {
1287 pr_debug("rx_loop: %d total_rx: %d\n",
1288 rx_loop, total_rx);
1289 return rx_loop;
1290 }
1291 total_rx += rx_loop;
1292 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1293 rx_loop, total_rx, data);
1294 }
1295
1296 return total_rx;
1297 }
1298
tx_data(struct iscsit_conn * conn,struct kvec * iov,int iov_count,int data)1299 int tx_data(
1300 struct iscsit_conn *conn,
1301 struct kvec *iov,
1302 int iov_count,
1303 int data)
1304 {
1305 struct msghdr msg;
1306 int total_tx = 0;
1307
1308 if (!conn || !conn->sock || !conn->conn_ops)
1309 return -1;
1310
1311 if (data <= 0) {
1312 pr_err("Data length is: %d\n", data);
1313 return -1;
1314 }
1315
1316 memset(&msg, 0, sizeof(struct msghdr));
1317
1318 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, iov_count, data);
1319
1320 while (msg_data_left(&msg)) {
1321 int tx_loop = sock_sendmsg(conn->sock, &msg);
1322 if (tx_loop <= 0) {
1323 pr_debug("tx_loop: %d total_tx %d\n",
1324 tx_loop, total_tx);
1325 return tx_loop;
1326 }
1327 total_tx += tx_loop;
1328 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1329 tx_loop, total_tx, data);
1330 }
1331
1332 return total_tx;
1333 }
1334
iscsit_collect_login_stats(struct iscsit_conn * conn,u8 status_class,u8 status_detail)1335 void iscsit_collect_login_stats(
1336 struct iscsit_conn *conn,
1337 u8 status_class,
1338 u8 status_detail)
1339 {
1340 struct iscsi_param *intrname = NULL;
1341 struct iscsi_tiqn *tiqn;
1342 struct iscsi_login_stats *ls;
1343
1344 tiqn = iscsit_snmp_get_tiqn(conn);
1345 if (!tiqn)
1346 return;
1347
1348 ls = &tiqn->login_stats;
1349
1350 spin_lock(&ls->lock);
1351 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1352 ls->accepts++;
1353 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1354 ls->redirects++;
1355 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1356 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1357 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1358 ls->authenticate_fails++;
1359 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1360 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1361 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1362 ls->authorize_fails++;
1363 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1364 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1365 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1366 ls->negotiate_fails++;
1367 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1368 } else {
1369 ls->other_fails++;
1370 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1371 }
1372
1373 /* Save initiator name, ip address and time, if it is a failed login */
1374 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1375 if (conn->param_list)
1376 intrname = iscsi_find_param_from_key(INITIATORNAME,
1377 conn->param_list);
1378 strscpy(ls->last_intr_fail_name,
1379 (intrname ? intrname->value : "Unknown"),
1380 sizeof(ls->last_intr_fail_name));
1381
1382 ls->last_intr_fail_ip_family = conn->login_family;
1383
1384 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1385 ls->last_fail_time = get_jiffies_64();
1386 }
1387
1388 spin_unlock(&ls->lock);
1389 }
1390
iscsit_snmp_get_tiqn(struct iscsit_conn * conn)1391 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsit_conn *conn)
1392 {
1393 struct iscsi_portal_group *tpg;
1394
1395 if (!conn)
1396 return NULL;
1397
1398 tpg = conn->tpg;
1399 if (!tpg)
1400 return NULL;
1401
1402 if (!tpg->tpg_tiqn)
1403 return NULL;
1404
1405 return tpg->tpg_tiqn;
1406 }
1407
iscsit_fill_cxn_timeout_err_stats(struct iscsit_session * sess)1408 void iscsit_fill_cxn_timeout_err_stats(struct iscsit_session *sess)
1409 {
1410 struct iscsi_portal_group *tpg = sess->tpg;
1411 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1412
1413 if (!tiqn)
1414 return;
1415
1416 spin_lock_bh(&tiqn->sess_err_stats.lock);
1417 strscpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1418 sess->sess_ops->InitiatorName,
1419 sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
1420 tiqn->sess_err_stats.last_sess_failure_type =
1421 ISCSI_SESS_ERR_CXN_TIMEOUT;
1422 tiqn->sess_err_stats.cxn_timeout_errors++;
1423 atomic_long_inc(&sess->conn_timeout_errors);
1424 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1425 }
1426