Merge tag 'clk-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[firefly-linux-kernel-4.4.55.git] / drivers / target / iscsi / iscsi_target_util.c
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  */
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
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
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  */
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
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  */
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
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
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
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
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  */
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
730 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
731 {
732         struct se_cmd *se_cmd = NULL;
733         int rc;
734         /*
735          * Determine if a struct se_cmd is associated with
736          * this struct iscsi_cmd.
737          */
738         switch (cmd->iscsi_opcode) {
739         case ISCSI_OP_SCSI_CMD:
740                 se_cmd = &cmd->se_cmd;
741                 __iscsit_free_cmd(cmd, true, shutdown);
742                 /*
743                  * Fallthrough
744                  */
745         case ISCSI_OP_SCSI_TMFUNC:
746                 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
747                 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
748                         __iscsit_free_cmd(cmd, true, shutdown);
749                         target_put_sess_cmd(se_cmd);
750                 }
751                 break;
752         case ISCSI_OP_REJECT:
753                 /*
754                  * Handle special case for REJECT when iscsi_add_reject*() has
755                  * overwritten the original iscsi_opcode assignment, and the
756                  * associated cmd->se_cmd needs to be released.
757                  */
758                 if (cmd->se_cmd.se_tfo != NULL) {
759                         se_cmd = &cmd->se_cmd;
760                         __iscsit_free_cmd(cmd, true, shutdown);
761
762                         rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
763                         if (!rc && shutdown && se_cmd->se_sess) {
764                                 __iscsit_free_cmd(cmd, true, shutdown);
765                                 target_put_sess_cmd(se_cmd);
766                         }
767                         break;
768                 }
769                 /* Fall-through */
770         default:
771                 __iscsit_free_cmd(cmd, false, shutdown);
772                 iscsit_release_cmd(cmd);
773                 break;
774         }
775 }
776
777 int iscsit_check_session_usage_count(struct iscsi_session *sess)
778 {
779         spin_lock_bh(&sess->session_usage_lock);
780         if (sess->session_usage_count != 0) {
781                 sess->session_waiting_on_uc = 1;
782                 spin_unlock_bh(&sess->session_usage_lock);
783                 if (in_interrupt())
784                         return 2;
785
786                 wait_for_completion(&sess->session_waiting_on_uc_comp);
787                 return 1;
788         }
789         spin_unlock_bh(&sess->session_usage_lock);
790
791         return 0;
792 }
793
794 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
795 {
796         spin_lock_bh(&sess->session_usage_lock);
797         sess->session_usage_count--;
798
799         if (!sess->session_usage_count && sess->session_waiting_on_uc)
800                 complete(&sess->session_waiting_on_uc_comp);
801
802         spin_unlock_bh(&sess->session_usage_lock);
803 }
804
805 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
806 {
807         spin_lock_bh(&sess->session_usage_lock);
808         sess->session_usage_count++;
809         spin_unlock_bh(&sess->session_usage_lock);
810 }
811
812 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
813 {
814         struct iscsi_conn *conn;
815
816         spin_lock_bh(&sess->conn_lock);
817         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
818                 if ((conn->cid == cid) &&
819                     (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
820                         iscsit_inc_conn_usage_count(conn);
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
830 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
831 {
832         struct iscsi_conn *conn;
833
834         spin_lock_bh(&sess->conn_lock);
835         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
836                 if (conn->cid == cid) {
837                         iscsit_inc_conn_usage_count(conn);
838                         spin_lock(&conn->state_lock);
839                         atomic_set(&conn->connection_wait_rcfr, 1);
840                         spin_unlock(&conn->state_lock);
841                         spin_unlock_bh(&sess->conn_lock);
842                         return conn;
843                 }
844         }
845         spin_unlock_bh(&sess->conn_lock);
846
847         return NULL;
848 }
849
850 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
851 {
852         spin_lock_bh(&conn->conn_usage_lock);
853         if (conn->conn_usage_count != 0) {
854                 conn->conn_waiting_on_uc = 1;
855                 spin_unlock_bh(&conn->conn_usage_lock);
856
857                 wait_for_completion(&conn->conn_waiting_on_uc_comp);
858                 return;
859         }
860         spin_unlock_bh(&conn->conn_usage_lock);
861 }
862
863 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
864 {
865         spin_lock_bh(&conn->conn_usage_lock);
866         conn->conn_usage_count--;
867
868         if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
869                 complete(&conn->conn_waiting_on_uc_comp);
870
871         spin_unlock_bh(&conn->conn_usage_lock);
872 }
873
874 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
875 {
876         spin_lock_bh(&conn->conn_usage_lock);
877         conn->conn_usage_count++;
878         spin_unlock_bh(&conn->conn_usage_lock);
879 }
880
881 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
882 {
883         u8 state;
884         struct iscsi_cmd *cmd;
885
886         cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
887         if (!cmd)
888                 return -1;
889
890         cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
891         state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
892                                 ISTATE_SEND_NOPIN_NO_RESPONSE;
893         cmd->init_task_tag = RESERVED_ITT;
894         cmd->targ_xfer_tag = (want_response) ?
895                              session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
896         spin_lock_bh(&conn->cmd_lock);
897         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
898         spin_unlock_bh(&conn->cmd_lock);
899
900         if (want_response)
901                 iscsit_start_nopin_response_timer(conn);
902         iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
903
904         return 0;
905 }
906
907 static void iscsit_handle_nopin_response_timeout(unsigned long data)
908 {
909         struct iscsi_conn *conn = (struct iscsi_conn *) data;
910
911         iscsit_inc_conn_usage_count(conn);
912
913         spin_lock_bh(&conn->nopin_timer_lock);
914         if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
915                 spin_unlock_bh(&conn->nopin_timer_lock);
916                 iscsit_dec_conn_usage_count(conn);
917                 return;
918         }
919
920         pr_debug("Did not receive response to NOPIN on CID: %hu on"
921                 " SID: %u, failing connection.\n", conn->cid,
922                         conn->sess->sid);
923         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
924         spin_unlock_bh(&conn->nopin_timer_lock);
925
926         {
927         struct iscsi_portal_group *tpg = conn->sess->tpg;
928         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
929
930         if (tiqn) {
931                 spin_lock_bh(&tiqn->sess_err_stats.lock);
932                 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
933                                 conn->sess->sess_ops->InitiatorName);
934                 tiqn->sess_err_stats.last_sess_failure_type =
935                                 ISCSI_SESS_ERR_CXN_TIMEOUT;
936                 tiqn->sess_err_stats.cxn_timeout_errors++;
937                 atomic_long_inc(&conn->sess->conn_timeout_errors);
938                 spin_unlock_bh(&tiqn->sess_err_stats.lock);
939         }
940         }
941
942         iscsit_cause_connection_reinstatement(conn, 0);
943         iscsit_dec_conn_usage_count(conn);
944 }
945
946 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
947 {
948         struct iscsi_session *sess = conn->sess;
949         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
950
951         spin_lock_bh(&conn->nopin_timer_lock);
952         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
953                 spin_unlock_bh(&conn->nopin_timer_lock);
954                 return;
955         }
956
957         mod_timer(&conn->nopin_response_timer,
958                 (get_jiffies_64() + na->nopin_response_timeout * HZ));
959         spin_unlock_bh(&conn->nopin_timer_lock);
960 }
961
962 /*
963  *      Called with conn->nopin_timer_lock held.
964  */
965 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
966 {
967         struct iscsi_session *sess = conn->sess;
968         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
969
970         spin_lock_bh(&conn->nopin_timer_lock);
971         if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
972                 spin_unlock_bh(&conn->nopin_timer_lock);
973                 return;
974         }
975
976         init_timer(&conn->nopin_response_timer);
977         conn->nopin_response_timer.expires =
978                 (get_jiffies_64() + na->nopin_response_timeout * HZ);
979         conn->nopin_response_timer.data = (unsigned long)conn;
980         conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
981         conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
982         conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
983         add_timer(&conn->nopin_response_timer);
984
985         pr_debug("Started NOPIN Response Timer on CID: %d to %u"
986                 " seconds\n", conn->cid, na->nopin_response_timeout);
987         spin_unlock_bh(&conn->nopin_timer_lock);
988 }
989
990 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
991 {
992         spin_lock_bh(&conn->nopin_timer_lock);
993         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
994                 spin_unlock_bh(&conn->nopin_timer_lock);
995                 return;
996         }
997         conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
998         spin_unlock_bh(&conn->nopin_timer_lock);
999
1000         del_timer_sync(&conn->nopin_response_timer);
1001
1002         spin_lock_bh(&conn->nopin_timer_lock);
1003         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1004         spin_unlock_bh(&conn->nopin_timer_lock);
1005 }
1006
1007 static void iscsit_handle_nopin_timeout(unsigned long data)
1008 {
1009         struct iscsi_conn *conn = (struct iscsi_conn *) data;
1010
1011         iscsit_inc_conn_usage_count(conn);
1012
1013         spin_lock_bh(&conn->nopin_timer_lock);
1014         if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1015                 spin_unlock_bh(&conn->nopin_timer_lock);
1016                 iscsit_dec_conn_usage_count(conn);
1017                 return;
1018         }
1019         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1020         spin_unlock_bh(&conn->nopin_timer_lock);
1021
1022         iscsit_add_nopin(conn, 1);
1023         iscsit_dec_conn_usage_count(conn);
1024 }
1025
1026 /*
1027  * Called with conn->nopin_timer_lock held.
1028  */
1029 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1030 {
1031         struct iscsi_session *sess = conn->sess;
1032         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1033         /*
1034         * NOPIN timeout is disabled.
1035          */
1036         if (!na->nopin_timeout)
1037                 return;
1038
1039         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1040                 return;
1041
1042         init_timer(&conn->nopin_timer);
1043         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1044         conn->nopin_timer.data = (unsigned long)conn;
1045         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1046         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1047         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1048         add_timer(&conn->nopin_timer);
1049
1050         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1051                 " interval\n", conn->cid, na->nopin_timeout);
1052 }
1053
1054 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1055 {
1056         struct iscsi_session *sess = conn->sess;
1057         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1058         /*
1059          * NOPIN timeout is disabled..
1060          */
1061         if (!na->nopin_timeout)
1062                 return;
1063
1064         spin_lock_bh(&conn->nopin_timer_lock);
1065         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1066                 spin_unlock_bh(&conn->nopin_timer_lock);
1067                 return;
1068         }
1069
1070         init_timer(&conn->nopin_timer);
1071         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1072         conn->nopin_timer.data = (unsigned long)conn;
1073         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1074         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1075         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1076         add_timer(&conn->nopin_timer);
1077
1078         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1079                         " interval\n", conn->cid, na->nopin_timeout);
1080         spin_unlock_bh(&conn->nopin_timer_lock);
1081 }
1082
1083 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1084 {
1085         spin_lock_bh(&conn->nopin_timer_lock);
1086         if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1087                 spin_unlock_bh(&conn->nopin_timer_lock);
1088                 return;
1089         }
1090         conn->nopin_timer_flags |= ISCSI_TF_STOP;
1091         spin_unlock_bh(&conn->nopin_timer_lock);
1092
1093         del_timer_sync(&conn->nopin_timer);
1094
1095         spin_lock_bh(&conn->nopin_timer_lock);
1096         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1097         spin_unlock_bh(&conn->nopin_timer_lock);
1098 }
1099
1100 int iscsit_send_tx_data(
1101         struct iscsi_cmd *cmd,
1102         struct iscsi_conn *conn,
1103         int use_misc)
1104 {
1105         int tx_sent, tx_size;
1106         u32 iov_count;
1107         struct kvec *iov;
1108
1109 send_data:
1110         tx_size = cmd->tx_size;
1111
1112         if (!use_misc) {
1113                 iov = &cmd->iov_data[0];
1114                 iov_count = cmd->iov_data_count;
1115         } else {
1116                 iov = &cmd->iov_misc[0];
1117                 iov_count = cmd->iov_misc_count;
1118         }
1119
1120         tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1121         if (tx_size != tx_sent) {
1122                 if (tx_sent == -EAGAIN) {
1123                         pr_err("tx_data() returned -EAGAIN\n");
1124                         goto send_data;
1125                 } else
1126                         return -1;
1127         }
1128         cmd->tx_size = 0;
1129
1130         return 0;
1131 }
1132
1133 int iscsit_fe_sendpage_sg(
1134         struct iscsi_cmd *cmd,
1135         struct iscsi_conn *conn)
1136 {
1137         struct scatterlist *sg = cmd->first_data_sg;
1138         struct kvec iov;
1139         u32 tx_hdr_size, data_len;
1140         u32 offset = cmd->first_data_sg_off;
1141         int tx_sent, iov_off;
1142
1143 send_hdr:
1144         tx_hdr_size = ISCSI_HDR_LEN;
1145         if (conn->conn_ops->HeaderDigest)
1146                 tx_hdr_size += ISCSI_CRC_LEN;
1147
1148         iov.iov_base = cmd->pdu;
1149         iov.iov_len = tx_hdr_size;
1150
1151         tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1152         if (tx_hdr_size != tx_sent) {
1153                 if (tx_sent == -EAGAIN) {
1154                         pr_err("tx_data() returned -EAGAIN\n");
1155                         goto send_hdr;
1156                 }
1157                 return -1;
1158         }
1159
1160         data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1161         /*
1162          * Set iov_off used by padding and data digest tx_data() calls below
1163          * in order to determine proper offset into cmd->iov_data[]
1164          */
1165         if (conn->conn_ops->DataDigest) {
1166                 data_len -= ISCSI_CRC_LEN;
1167                 if (cmd->padding)
1168                         iov_off = (cmd->iov_data_count - 2);
1169                 else
1170                         iov_off = (cmd->iov_data_count - 1);
1171         } else {
1172                 iov_off = (cmd->iov_data_count - 1);
1173         }
1174         /*
1175          * Perform sendpage() for each page in the scatterlist
1176          */
1177         while (data_len) {
1178                 u32 space = (sg->length - offset);
1179                 u32 sub_len = min_t(u32, data_len, space);
1180 send_pg:
1181                 tx_sent = conn->sock->ops->sendpage(conn->sock,
1182                                         sg_page(sg), sg->offset + offset, sub_len, 0);
1183                 if (tx_sent != sub_len) {
1184                         if (tx_sent == -EAGAIN) {
1185                                 pr_err("tcp_sendpage() returned"
1186                                                 " -EAGAIN\n");
1187                                 goto send_pg;
1188                         }
1189
1190                         pr_err("tcp_sendpage() failure: %d\n",
1191                                         tx_sent);
1192                         return -1;
1193                 }
1194
1195                 data_len -= sub_len;
1196                 offset = 0;
1197                 sg = sg_next(sg);
1198         }
1199
1200 send_padding:
1201         if (cmd->padding) {
1202                 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1203
1204                 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1205                 if (cmd->padding != tx_sent) {
1206                         if (tx_sent == -EAGAIN) {
1207                                 pr_err("tx_data() returned -EAGAIN\n");
1208                                 goto send_padding;
1209                         }
1210                         return -1;
1211                 }
1212         }
1213
1214 send_datacrc:
1215         if (conn->conn_ops->DataDigest) {
1216                 struct kvec *iov_d = &cmd->iov_data[iov_off];
1217
1218                 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1219                 if (ISCSI_CRC_LEN != tx_sent) {
1220                         if (tx_sent == -EAGAIN) {
1221                                 pr_err("tx_data() returned -EAGAIN\n");
1222                                 goto send_datacrc;
1223                         }
1224                         return -1;
1225                 }
1226         }
1227
1228         return 0;
1229 }
1230
1231 /*
1232  *      This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1233  *      back to the Initiator when an expection condition occurs with the
1234  *      errors set in status_class and status_detail.
1235  *
1236  *      Parameters:     iSCSI Connection, Status Class, Status Detail.
1237  *      Returns:        0 on success, -1 on error.
1238  */
1239 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1240 {
1241         struct iscsi_login_rsp *hdr;
1242         struct iscsi_login *login = conn->conn_login;
1243
1244         login->login_failed = 1;
1245         iscsit_collect_login_stats(conn, status_class, status_detail);
1246
1247         memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1248
1249         hdr     = (struct iscsi_login_rsp *)&login->rsp[0];
1250         hdr->opcode             = ISCSI_OP_LOGIN_RSP;
1251         hdr->status_class       = status_class;
1252         hdr->status_detail      = status_detail;
1253         hdr->itt                = conn->login_itt;
1254
1255         return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1256 }
1257
1258 void iscsit_print_session_params(struct iscsi_session *sess)
1259 {
1260         struct iscsi_conn *conn;
1261
1262         pr_debug("-----------------------------[Session Params for"
1263                 " SID: %u]-----------------------------\n", sess->sid);
1264         spin_lock_bh(&sess->conn_lock);
1265         list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1266                 iscsi_dump_conn_ops(conn->conn_ops);
1267         spin_unlock_bh(&sess->conn_lock);
1268
1269         iscsi_dump_sess_ops(sess->sess_ops);
1270 }
1271
1272 static int iscsit_do_rx_data(
1273         struct iscsi_conn *conn,
1274         struct iscsi_data_count *count)
1275 {
1276         int data = count->data_length, rx_loop = 0, total_rx = 0;
1277         struct msghdr msg;
1278
1279         if (!conn || !conn->sock || !conn->conn_ops)
1280                 return -1;
1281
1282         memset(&msg, 0, sizeof(struct msghdr));
1283         iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1284                       count->iov, count->iov_count, data);
1285
1286         while (total_rx < data) {
1287                 rx_loop = sock_recvmsg(conn->sock, &msg,
1288                                       (data - total_rx), MSG_WAITALL);
1289                 if (rx_loop <= 0) {
1290                         pr_debug("rx_loop: %d total_rx: %d\n",
1291                                 rx_loop, total_rx);
1292                         return rx_loop;
1293                 }
1294                 total_rx += rx_loop;
1295                 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1296                                 rx_loop, total_rx, data);
1297         }
1298
1299         return total_rx;
1300 }
1301
1302 static int iscsit_do_tx_data(
1303         struct iscsi_conn *conn,
1304         struct iscsi_data_count *count)
1305 {
1306         int ret, iov_len;
1307         struct kvec *iov_p;
1308         struct msghdr msg;
1309
1310         if (!conn || !conn->sock || !conn->conn_ops)
1311                 return -1;
1312
1313         if (count->data_length <= 0) {
1314                 pr_err("Data length is: %d\n", count->data_length);
1315                 return -1;
1316         }
1317
1318         memset(&msg, 0, sizeof(struct msghdr));
1319
1320         iov_p = count->iov;
1321         iov_len = count->iov_count;
1322
1323         ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1324                              count->data_length);
1325         if (ret != count->data_length) {
1326                 pr_err("Unexpected ret: %d send data %d\n",
1327                        ret, count->data_length);
1328                 return -EPIPE;
1329         }
1330         pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
1331
1332         return ret;
1333 }
1334
1335 int rx_data(
1336         struct iscsi_conn *conn,
1337         struct kvec *iov,
1338         int iov_count,
1339         int data)
1340 {
1341         struct iscsi_data_count c;
1342
1343         if (!conn || !conn->sock || !conn->conn_ops)
1344                 return -1;
1345
1346         memset(&c, 0, sizeof(struct iscsi_data_count));
1347         c.iov = iov;
1348         c.iov_count = iov_count;
1349         c.data_length = data;
1350         c.type = ISCSI_RX_DATA;
1351
1352         return iscsit_do_rx_data(conn, &c);
1353 }
1354
1355 int tx_data(
1356         struct iscsi_conn *conn,
1357         struct kvec *iov,
1358         int iov_count,
1359         int data)
1360 {
1361         struct iscsi_data_count c;
1362
1363         if (!conn || !conn->sock || !conn->conn_ops)
1364                 return -1;
1365
1366         memset(&c, 0, sizeof(struct iscsi_data_count));
1367         c.iov = iov;
1368         c.iov_count = iov_count;
1369         c.data_length = data;
1370         c.type = ISCSI_TX_DATA;
1371
1372         return iscsit_do_tx_data(conn, &c);
1373 }
1374
1375 static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y)
1376 {
1377         switch (x->ss_family) {
1378         case AF_INET: {
1379                 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
1380                 struct sockaddr_in *siny = (struct sockaddr_in *)y;
1381                 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
1382                         return false;
1383                 if (sinx->sin_port != siny->sin_port)
1384                         return false;
1385                 break;
1386         }
1387         case AF_INET6: {
1388                 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
1389                 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
1390                 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
1391                         return false;
1392                 if (sinx->sin6_port != siny->sin6_port)
1393                         return false;
1394                 break;
1395         }
1396         default:
1397                 return false;
1398         }
1399         return true;
1400 }
1401
1402 void iscsit_collect_login_stats(
1403         struct iscsi_conn *conn,
1404         u8 status_class,
1405         u8 status_detail)
1406 {
1407         struct iscsi_param *intrname = NULL;
1408         struct iscsi_tiqn *tiqn;
1409         struct iscsi_login_stats *ls;
1410
1411         tiqn = iscsit_snmp_get_tiqn(conn);
1412         if (!tiqn)
1413                 return;
1414
1415         ls = &tiqn->login_stats;
1416
1417         spin_lock(&ls->lock);
1418         if (sockaddr_equal(&conn->login_sockaddr, &ls->last_intr_fail_sockaddr) &&
1419             ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1420                 /* We already have the failure info for this login */
1421                 spin_unlock(&ls->lock);
1422                 return;
1423         }
1424
1425         if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1426                 ls->accepts++;
1427         else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1428                 ls->redirects++;
1429                 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1430         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1431                  (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1432                 ls->authenticate_fails++;
1433                 ls->last_fail_type =  ISCSI_LOGIN_FAIL_AUTHENTICATE;
1434         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1435                  (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1436                 ls->authorize_fails++;
1437                 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1438         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1439                  (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1440                 ls->negotiate_fails++;
1441                 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1442         } else {
1443                 ls->other_fails++;
1444                 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1445         }
1446
1447         /* Save initiator name, ip address and time, if it is a failed login */
1448         if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1449                 if (conn->param_list)
1450                         intrname = iscsi_find_param_from_key(INITIATORNAME,
1451                                                              conn->param_list);
1452                 strlcpy(ls->last_intr_fail_name,
1453                        (intrname ? intrname->value : "Unknown"),
1454                        sizeof(ls->last_intr_fail_name));
1455
1456                 ls->last_intr_fail_ip_family = conn->login_family;
1457
1458                 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1459                 ls->last_fail_time = get_jiffies_64();
1460         }
1461
1462         spin_unlock(&ls->lock);
1463 }
1464
1465 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1466 {
1467         struct iscsi_portal_group *tpg;
1468
1469         if (!conn || !conn->sess)
1470                 return NULL;
1471
1472         tpg = conn->sess->tpg;
1473         if (!tpg)
1474                 return NULL;
1475
1476         if (!tpg->tpg_tiqn)
1477                 return NULL;
1478
1479         return tpg->tpg_tiqn;
1480 }