blob: c1582e88191e8f6b7c42e91e25460fc23718e52b [file] [log] [blame]
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
Nicholas Bellinger4c762512013-09-05 15:29:12 -07004 * (c) Copyright 2007-2013 Datera, Inc.
Nicholas Bellingere48354c2011-07-23 06:43:04 +00005 *
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>
Nicholas Bellinger988e3a82013-08-17 15:49:08 -070020#include <linux/percpu_ida.h>
Nicholas Bellingere48354c2011-07-23 06:43:04 +000021#include <scsi/scsi_tcq.h>
22#include <scsi/iscsi_proto.h>
23#include <target/target_core_base.h>
Christoph Hellwigc4795fb2011-11-16 09:46:48 -050024#include <target/target_core_fabric.h>
Nicholas Bellingere48354c2011-07-23 06:43:04 +000025#include <target/target_core_configfs.h>
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -080026#include <target/iscsi/iscsi_transport.h>
Nicholas Bellingere48354c2011-07-23 06:43:04 +000027
Sagi Grimberg67f091f2015-01-07 14:57:31 +020028#include <target/iscsi/iscsi_target_core.h>
Nicholas Bellingere48354c2011-07-23 06:43:04 +000029#include "iscsi_target_parameters.h"
30#include "iscsi_target_seq_pdu_list.h"
31#include "iscsi_target_datain_values.h"
32#include "iscsi_target_erl0.h"
33#include "iscsi_target_erl1.h"
34#include "iscsi_target_erl2.h"
35#include "iscsi_target_tpg.h"
Nicholas Bellingere48354c2011-07-23 06:43:04 +000036#include "iscsi_target_util.h"
37#include "iscsi_target.h"
38
39#define PRINT_BUFF(buff, len) \
40{ \
41 int zzz; \
42 \
43 pr_debug("%d:\n", __LINE__); \
44 for (zzz = 0; zzz < len; zzz++) { \
45 if (zzz % 16 == 0) { \
46 if (zzz) \
47 pr_debug("\n"); \
48 pr_debug("%4i: ", zzz); \
49 } \
50 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
51 } \
52 if ((len + 1) % 16) \
53 pr_debug("\n"); \
54}
55
56extern struct list_head g_tiqn_list;
57extern spinlock_t tiqn_lock;
58
59/*
60 * Called with cmd->r2t_lock held.
61 */
62int iscsit_add_r2t_to_list(
63 struct iscsi_cmd *cmd,
64 u32 offset,
65 u32 xfer_len,
66 int recovery,
67 u32 r2t_sn)
68{
69 struct iscsi_r2t *r2t;
70
71 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
72 if (!r2t) {
73 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
74 return -1;
75 }
76 INIT_LIST_HEAD(&r2t->r2t_list);
77
78 r2t->recovery_r2t = recovery;
79 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
80 r2t->offset = offset;
81 r2t->xfer_len = xfer_len;
82 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
83 spin_unlock_bh(&cmd->r2t_lock);
84
85 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
86
87 spin_lock_bh(&cmd->r2t_lock);
88 return 0;
89}
90
91struct iscsi_r2t *iscsit_get_r2t_for_eos(
92 struct iscsi_cmd *cmd,
93 u32 offset,
94 u32 length)
95{
96 struct iscsi_r2t *r2t;
97
98 spin_lock_bh(&cmd->r2t_lock);
99 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
100 if ((r2t->offset <= offset) &&
101 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
102 spin_unlock_bh(&cmd->r2t_lock);
103 return r2t;
104 }
105 }
106 spin_unlock_bh(&cmd->r2t_lock);
107
108 pr_err("Unable to locate R2T for Offset: %u, Length:"
109 " %u\n", offset, length);
110 return NULL;
111}
112
113struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
114{
115 struct iscsi_r2t *r2t;
116
117 spin_lock_bh(&cmd->r2t_lock);
118 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
119 if (!r2t->sent_r2t) {
120 spin_unlock_bh(&cmd->r2t_lock);
121 return r2t;
122 }
123 }
124 spin_unlock_bh(&cmd->r2t_lock);
125
126 pr_err("Unable to locate next R2T to send for ITT:"
127 " 0x%08x.\n", cmd->init_task_tag);
128 return NULL;
129}
130
131/*
132 * Called with cmd->r2t_lock held.
133 */
134void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
135{
136 list_del(&r2t->r2t_list);
137 kmem_cache_free(lio_r2t_cache, r2t);
138}
139
140void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
141{
142 struct iscsi_r2t *r2t, *r2t_tmp;
143
144 spin_lock_bh(&cmd->r2t_lock);
145 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
146 iscsit_free_r2t(r2t, cmd);
147 spin_unlock_bh(&cmd->r2t_lock);
148}
149
150/*
151 * May be called from software interrupt (timer) context for allocating
152 * iSCSI NopINs.
153 */
Nicholas Bellinger676687c2014-01-20 03:36:44 +0000154struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000155{
156 struct iscsi_cmd *cmd;
Nicholas Bellinger988e3a82013-08-17 15:49:08 -0700157 struct se_session *se_sess = conn->sess->se_sess;
Nicholas Bellinger676687c2014-01-20 03:36:44 +0000158 int size, tag;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000159
Kent Overstreet6f6b5d12014-01-19 08:26:37 +0000160 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
161 if (tag < 0)
162 return NULL;
163
Nicholas Bellinger988e3a82013-08-17 15:49:08 -0700164 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
165 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
166 memset(cmd, 0, size);
167
168 cmd->se_cmd.map_tag = tag;
Nicholas Bellingercdb72662013-03-06 22:09:17 -0800169 cmd->conn = conn;
Andy Grover2fbb4712012-04-03 15:51:01 -0700170 INIT_LIST_HEAD(&cmd->i_conn_node);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000171 INIT_LIST_HEAD(&cmd->datain_list);
172 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000173 spin_lock_init(&cmd->datain_lock);
174 spin_lock_init(&cmd->dataout_timeout_lock);
175 spin_lock_init(&cmd->istate_lock);
176 spin_lock_init(&cmd->error_lock);
177 spin_lock_init(&cmd->r2t_lock);
178
179 return cmd;
180}
Nicholas Bellingercdb72662013-03-06 22:09:17 -0800181EXPORT_SYMBOL(iscsit_allocate_cmd);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000182
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000183struct iscsi_seq *iscsit_get_seq_holder_for_datain(
184 struct iscsi_cmd *cmd,
185 u32 seq_send_order)
186{
187 u32 i;
188
189 for (i = 0; i < cmd->seq_count; i++)
190 if (cmd->seq_list[i].seq_send_order == seq_send_order)
191 return &cmd->seq_list[i];
192
193 return NULL;
194}
195
196struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
197{
198 u32 i;
199
200 if (!cmd->seq_list) {
201 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
202 return NULL;
203 }
204
205 for (i = 0; i < cmd->seq_count; i++) {
206 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
207 continue;
208 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
209 cmd->seq_send_order++;
210 return &cmd->seq_list[i];
211 }
212 }
213
214 return NULL;
215}
216
217struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
218 struct iscsi_cmd *cmd,
219 u32 r2t_sn)
220{
221 struct iscsi_r2t *r2t;
222
223 spin_lock_bh(&cmd->r2t_lock);
224 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
225 if (r2t->r2t_sn == r2t_sn) {
226 spin_unlock_bh(&cmd->r2t_lock);
227 return r2t;
228 }
229 }
230 spin_unlock_bh(&cmd->r2t_lock);
231
232 return NULL;
233}
234
235static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
236{
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 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
246 pr_err("Received CmdSN: 0x%08x is greater than"
Nicholas Bellingerea7e32b2013-11-18 10:55:10 -0800247 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000248 sess->max_cmd_sn);
Nicholas Bellingerea7e32b2013-11-18 10:55:10 -0800249 ret = CMDSN_MAXCMDSN_OVERRUN;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000250
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 */
Nicholas Bellinger561bf152013-07-03 03:58:58 -0700278int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
279 unsigned char *buf, __be32 cmdsn)
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000280{
Nicholas Bellinger561bf152013-07-03 03:58:58 -0700281 int ret, cmdsn_ret;
282 bool reject = false;
283 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000284
285 mutex_lock(&conn->sess->cmdsn_mutex);
286
Christoph Hellwig50e5c872012-09-26 08:00:40 -0400287 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000288 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);
Nicholas Bellinger561bf152013-07-03 03:58:58 -0700293 else if (ret < 0) {
294 reject = true;
295 ret = CMDSN_ERROR_CANNOT_RECOVER;
296 }
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000297 break;
298 case CMDSN_HIGHER_THAN_EXP:
Christoph Hellwig50e5c872012-09-26 08:00:40 -0400299 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
Nicholas Bellinger561bf152013-07-03 03:58:58 -0700300 if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 break;
304 }
305 ret = CMDSN_HIGHER_THAN_EXP;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000306 break;
307 case CMDSN_LOWER_THAN_EXP:
Nicholas Bellingerea7e32b2013-11-18 10:55:10 -0800308 case CMDSN_MAXCMDSN_OVERRUN:
309 default:
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000310 cmd->i_state = ISTATE_REMOVE;
311 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
Nicholas Bellingerea7e32b2013-11-18 10:55:10 -0800312 /*
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;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000318 break;
319 }
320 mutex_unlock(&conn->sess->cmdsn_mutex);
321
Nicholas Bellinger561bf152013-07-03 03:58:58 -0700322 if (reject)
323 iscsit_reject_cmd(cmd, reason, buf);
324
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000325 return ret;
326}
Nicholas Bellinger3e1c81a2013-03-06 22:18:24 -0800327EXPORT_SYMBOL(iscsit_sequence_cmd);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000328
329int 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
Andy Groverebf1d952012-04-03 15:51:24 -0700358 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000359 ((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),
Andy Groverebf1d952012-04-03 15:51:24 -0700365 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000366 transport_send_check_condition_and_sense(se_cmd,
367 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
368 return -1;
369 }
370 return 0;
371}
372
373struct iscsi_cmd *iscsit_find_cmd_from_itt(
374 struct iscsi_conn *conn,
Christoph Hellwig66c7db62012-09-26 08:00:39 -0400375 itt_t init_task_tag)
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000376{
377 struct iscsi_cmd *cmd;
378
379 spin_lock_bh(&conn->cmd_lock);
Andy Grover2fbb4712012-04-03 15:51:01 -0700380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000381 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}
Sagi Grimberge4f4e802015-02-09 18:07:25 +0200392EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000393
394struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
Christoph Hellwig66c7db62012-09-26 08:00:39 -0400396 itt_t init_task_tag,
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000397 u32 length)
398{
399 struct iscsi_cmd *cmd;
400
401 spin_lock_bh(&conn->cmd_lock);
Andy Grover2fbb4712012-04-03 15:51:01 -0700402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
Nicholas Bellinger3687db82014-07-07 18:25:04 -0700403 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
404 continue;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000405 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
420struct 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);
Andy Grover2fbb4712012-04-03 15:51:01 -0700427 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000428 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
440int iscsit_find_cmd_for_recovery(
441 struct iscsi_session *sess,
442 struct iscsi_cmd **cmd_ptr,
443 struct iscsi_conn_recovery **cr_ptr,
Christoph Hellwig66c7db62012-09-26 08:00:39 -0400444 itt_t init_task_tag)
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000445{
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);
Andy Grover2fbb4712012-04-03 15:51:01 -0700455 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000456 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);
Andy Grover2fbb4712012-04-03 15:51:01 -0700475 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000476 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
492void 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
Roland Dreierd5627ac2012-10-31 09:16:46 -0700515 wake_up(&conn->queues_wq);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000516}
517
518struct 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 }
Roland Dreier1f981de2012-10-31 09:16:47 -0700527 qr = list_first_entry(&conn->immed_queue_list,
528 struct iscsi_queue_req, qr_list);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000529
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
538static 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
567void 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
Roland Dreierd5627ac2012-10-31 09:16:46 -0700589 wake_up(&conn->queues_wq);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000590}
591
592struct 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
Roland Dreier1f981de2012-10-31 09:16:47 -0700602 qr = list_first_entry(&conn->response_queue_list,
603 struct iscsi_queue_req, qr_list);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000604
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
613static 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
Roland Dreierd5627ac2012-10-31 09:16:46 -0700643bool 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000661void 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
687void iscsit_release_cmd(struct iscsi_cmd *cmd)
688{
Nicholas Bellinger988e3a82013-08-17 15:49:08 -0700689 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000699 kfree(cmd->buf_ptr);
700 kfree(cmd->pdu_list);
701 kfree(cmd->seq_list);
702 kfree(cmd->tmr_req);
703 kfree(cmd->iov_data);
Nicholas Bellinger9864ca92013-06-19 22:43:11 -0700704 kfree(cmd->text_in_ptr);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000705
Nicholas Bellinger988e3a82013-08-17 15:49:08 -0700706 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000707}
Nicholas Bellingerd703ce22013-08-17 14:27:56 -0700708EXPORT_SYMBOL(iscsit_release_cmd);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000709
Nicholas Bellinger131e6ab2014-03-22 14:55:56 -0700710void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
711 bool check_queues)
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700712{
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700713 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
730void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
731{
732 struct se_cmd *se_cmd = NULL;
733 int rc;
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700734 /*
Masanari Iida20879692012-08-27 22:46:00 +0900735 * Determine if a struct se_cmd is associated with
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700736 * this struct iscsi_cmd.
737 */
738 switch (cmd->iscsi_opcode) {
739 case ISCSI_OP_SCSI_CMD:
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700740 se_cmd = &cmd->se_cmd;
741 __iscsit_free_cmd(cmd, true, shutdown);
Nicholas Bellingercdb72662013-03-06 22:09:17 -0800742 /*
743 * Fallthrough
744 */
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700745 case ISCSI_OP_SCSI_TMFUNC:
Nicholas Bellingere255a282013-10-03 13:37:21 -0700746 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700747 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
748 __iscsit_free_cmd(cmd, true, shutdown);
Bart Van Asscheafc16602015-04-27 13:52:36 +0200749 target_put_sess_cmd(se_cmd);
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700750 }
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700751 break;
Nicholas Bellingerc1ce4bd2012-01-16 16:04:15 -0800752 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) {
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700759 se_cmd = &cmd->se_cmd;
760 __iscsit_free_cmd(cmd, true, shutdown);
761
Nicholas Bellingere255a282013-10-03 13:37:21 -0700762 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700763 if (!rc && shutdown && se_cmd->se_sess) {
764 __iscsit_free_cmd(cmd, true, shutdown);
Bart Van Asscheafc16602015-04-27 13:52:36 +0200765 target_put_sess_cmd(se_cmd);
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700766 }
Nicholas Bellingerc1ce4bd2012-01-16 16:04:15 -0800767 break;
768 }
769 /* Fall-through */
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700770 default:
Nicholas Bellingeraafc9d12013-05-31 00:49:41 -0700771 __iscsit_free_cmd(cmd, false, shutdown);
Nicholas Bellingerd703ce22013-08-17 14:27:56 -0700772 iscsit_release_cmd(cmd);
Nicholas Bellingerd2701902011-10-09 01:48:14 -0700773 break;
774 }
775}
776
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000777int 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
794void 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
805void 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000812struct 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
830struct 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
850void 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
863void 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
874void 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
881static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
882{
883 u8 state;
884 struct iscsi_cmd *cmd;
885
Nicholas Bellinger676687c2014-01-20 03:36:44 +0000886 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000887 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;
Christoph Hellwig66c7db62012-09-26 08:00:39 -0400893 cmd->init_task_tag = RESERVED_ITT;
Sagi Grimbergc1e34b62015-01-26 12:49:05 +0200894 cmd->targ_xfer_tag = (want_response) ?
895 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000896 spin_lock_bh(&conn->cmd_lock);
Andy Grover2fbb4712012-04-03 15:51:01 -0700897 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000898 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
907static 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,
Jörn Engel8359cf42011-11-24 02:05:51 +0100933 conn->sess->sess_ops->InitiatorName);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000934 tiqn->sess_err_stats.last_sess_failure_type =
935 ISCSI_SESS_ERR_CXN_TIMEOUT;
936 tiqn->sess_err_stats.cxn_timeout_errors++;
Nicholas Bellinger04f3b312013-11-13 18:54:45 -0800937 atomic_long_inc(&conn->sess->conn_timeout_errors);
Nicholas Bellingere48354c2011-07-23 06:43:04 +0000938 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
946void 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 */
965void 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
990void 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
1007static 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 */
1029void __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
1054void 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
1083void 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
1100int 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
1109send_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
1133int 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;
Nicholas Bellinger40b05492011-09-16 16:55:47 -07001141 int tx_sent, iov_off;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001142
1143send_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;
Nicholas Bellinger40b05492011-09-16 16:55:47 -07001161 /*
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) {
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001166 data_len -= ISCSI_CRC_LEN;
Nicholas Bellinger40b05492011-09-16 16:55:47 -07001167 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 }
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001174 /*
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);
1180send_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
1200send_padding:
1201 if (cmd->padding) {
Nicholas Bellinger40b05492011-09-16 16:55:47 -07001202 struct kvec *iov_p = &cmd->iov_data[iov_off++];
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001203
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
1214send_datacrc:
1215 if (conn->conn_ops->DataDigest) {
Nicholas Bellinger40b05492011-09-16 16:55:47 -07001216 struct kvec *iov_d = &cmd->iov_data[iov_off];
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001217
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 */
1239int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1240{
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001241 struct iscsi_login_rsp *hdr;
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -08001242 struct iscsi_login *login = conn->conn_login;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001243
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -08001244 login->login_failed = 1;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001245 iscsit_collect_login_stats(conn, status_class, status_detail);
1246
Nicholas Bellinger68349752014-06-17 21:54:38 +00001247 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1248
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -08001249 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001250 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1251 hdr->status_class = status_class;
1252 hdr->status_detail = status_detail;
Christoph Hellwig66c7db62012-09-26 08:00:39 -04001253 hdr->itt = conn->login_itt;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001254
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -08001255 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001256}
1257
1258void 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
1272static int iscsit_do_rx_data(
1273 struct iscsi_conn *conn,
1274 struct iscsi_data_count *count)
1275{
Al Viroe5a4b0b2014-11-24 18:17:55 -05001276 int data = count->data_length, rx_loop = 0, total_rx = 0;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001277 struct msghdr msg;
1278
1279 if (!conn || !conn->sock || !conn->conn_ops)
1280 return -1;
1281
1282 memset(&msg, 0, sizeof(struct msghdr));
Al Viroe5a4b0b2014-11-24 18:17:55 -05001283 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1284 count->iov, count->iov_count, data);
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001285
1286 while (total_rx < data) {
Al Viroe5a4b0b2014-11-24 18:17:55 -05001287 rx_loop = sock_recvmsg(conn->sock, &msg,
1288 (data - total_rx), MSG_WAITALL);
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001289 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001299 return total_rx;
1300}
1301
1302static int iscsit_do_tx_data(
1303 struct iscsi_conn *conn,
1304 struct iscsi_data_count *count)
1305{
Nicholas Bellinger6bf6ca72014-11-20 20:50:07 -08001306 int ret, iov_len;
Nicholas Bellinger2ff017f2011-09-16 01:44:54 -07001307 struct kvec *iov_p;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001308 struct msghdr msg;
1309
1310 if (!conn || !conn->sock || !conn->conn_ops)
1311 return -1;
1312
Nicholas Bellinger6bf6ca72014-11-20 20:50:07 -08001313 if (count->data_length <= 0) {
1314 pr_err("Data length is: %d\n", count->data_length);
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001315 return -1;
1316 }
1317
1318 memset(&msg, 0, sizeof(struct msghdr));
1319
Nicholas Bellinger2ff017f2011-09-16 01:44:54 -07001320 iov_p = count->iov;
1321 iov_len = count->iov_count;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001322
Nicholas Bellinger6bf6ca72014-11-20 20:50:07 -08001323 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;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001329 }
Nicholas Bellinger6bf6ca72014-11-20 20:50:07 -08001330 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001331
Nicholas Bellinger6bf6ca72014-11-20 20:50:07 -08001332 return ret;
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001333}
1334
1335int 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001352 return iscsit_do_rx_data(conn, &c);
1353}
1354
1355int 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
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001372 return iscsit_do_tx_data(conn, &c);
1373}
1374
1375void iscsit_collect_login_stats(
1376 struct iscsi_conn *conn,
1377 u8 status_class,
1378 u8 status_detail)
1379{
1380 struct iscsi_param *intrname = NULL;
1381 struct iscsi_tiqn *tiqn;
1382 struct iscsi_login_stats *ls;
1383
1384 tiqn = iscsit_snmp_get_tiqn(conn);
1385 if (!tiqn)
1386 return;
1387
1388 ls = &tiqn->login_stats;
1389
1390 spin_lock(&ls->lock);
1391 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1392 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1393 /* We already have the failure info for this login */
1394 spin_unlock(&ls->lock);
1395 return;
1396 }
1397
1398 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1399 ls->accepts++;
1400 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1401 ls->redirects++;
1402 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1403 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1404 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1405 ls->authenticate_fails++;
1406 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1407 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1408 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1409 ls->authorize_fails++;
1410 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1411 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1412 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1413 ls->negotiate_fails++;
1414 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1415 } else {
1416 ls->other_fails++;
1417 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1418 }
1419
1420 /* Save initiator name, ip address and time, if it is a failed login */
1421 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1422 if (conn->param_list)
1423 intrname = iscsi_find_param_from_key(INITIATORNAME,
1424 conn->param_list);
Joern Engelfdc84d12014-09-02 17:49:55 -04001425 strlcpy(ls->last_intr_fail_name,
1426 (intrname ? intrname->value : "Unknown"),
1427 sizeof(ls->last_intr_fail_name));
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001428
Nicholas Bellingerbaa4d642013-03-06 21:54:13 -08001429 ls->last_intr_fail_ip_family = conn->login_family;
1430
Nicholas Bellingere48354c2011-07-23 06:43:04 +00001431 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1432 "%s", conn->login_ip);
1433 ls->last_fail_time = get_jiffies_64();
1434 }
1435
1436 spin_unlock(&ls->lock);
1437}
1438
1439struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1440{
1441 struct iscsi_portal_group *tpg;
1442
1443 if (!conn || !conn->sess)
1444 return NULL;
1445
1446 tpg = conn->sess->tpg;
1447 if (!tpg)
1448 return NULL;
1449
1450 if (!tpg->tpg_tiqn)
1451 return NULL;
1452
1453 return tpg->tpg_tiqn;
1454}