1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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.
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 ******************************************************************************/
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/target_core_configfs.h>
26 #include <target/iscsi/iscsi_transport.h>
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
40 #define PRINT_BUFF(buff, len) \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
49 pr_debug("%4i: ", zzz); \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
57 extern struct list_head g_tiqn_list;
58 extern spinlock_t tiqn_lock;
61 * Called with cmd->r2t_lock held.
63 int iscsit_add_r2t_to_list(
64 struct iscsi_cmd *cmd,
70 struct iscsi_r2t *r2t;
72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
77 INIT_LIST_HEAD(&r2t->r2t_list);
79 r2t->recovery_r2t = recovery;
80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
82 r2t->xfer_len = xfer_len;
83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
84 spin_unlock_bh(&cmd->r2t_lock);
86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
88 spin_lock_bh(&cmd->r2t_lock);
92 struct iscsi_r2t *iscsit_get_r2t_for_eos(
93 struct iscsi_cmd *cmd,
97 struct iscsi_r2t *r2t;
99 spin_lock_bh(&cmd->r2t_lock);
100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
101 if ((r2t->offset <= offset) &&
102 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
103 spin_unlock_bh(&cmd->r2t_lock);
107 spin_unlock_bh(&cmd->r2t_lock);
109 pr_err("Unable to locate R2T for Offset: %u, Length:"
110 " %u\n", offset, length);
114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
116 struct iscsi_r2t *r2t;
118 spin_lock_bh(&cmd->r2t_lock);
119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
120 if (!r2t->sent_r2t) {
121 spin_unlock_bh(&cmd->r2t_lock);
125 spin_unlock_bh(&cmd->r2t_lock);
127 pr_err("Unable to locate next R2T to send for ITT:"
128 " 0x%08x.\n", cmd->init_task_tag);
133 * Called with cmd->r2t_lock held.
135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
137 list_del(&r2t->r2t_list);
138 kmem_cache_free(lio_r2t_cache, r2t);
141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
143 struct iscsi_r2t *r2t, *r2t_tmp;
145 spin_lock_bh(&cmd->r2t_lock);
146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
147 iscsit_free_r2t(r2t, cmd);
148 spin_unlock_bh(&cmd->r2t_lock);
152 * May be called from software interrupt (timer) context for allocating
155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
157 struct iscsi_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
165 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
166 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
167 memset(cmd, 0, size);
169 cmd->se_cmd.map_tag = tag;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
182 EXPORT_SYMBOL(iscsit_allocate_cmd);
184 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
185 struct iscsi_cmd *cmd,
190 for (i = 0; i < cmd->seq_count; i++)
191 if (cmd->seq_list[i].seq_send_order == seq_send_order)
192 return &cmd->seq_list[i];
197 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
201 if (!cmd->seq_list) {
202 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
206 for (i = 0; i < cmd->seq_count; i++) {
207 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
209 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
210 cmd->seq_send_order++;
211 return &cmd->seq_list[i];
218 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
219 struct iscsi_cmd *cmd,
222 struct iscsi_r2t *r2t;
224 spin_lock_bh(&cmd->r2t_lock);
225 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
226 if (r2t->r2t_sn == r2t_sn) {
227 spin_unlock_bh(&cmd->r2t_lock);
231 spin_unlock_bh(&cmd->r2t_lock);
236 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
241 * This is the proper method of checking received CmdSN against
242 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
243 * or order CmdSNs due to multiple connection sessions and/or
246 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
247 pr_err("Received CmdSN: 0x%08x is greater than"
248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
250 ret = CMDSN_MAXCMDSN_OVERRUN;
252 } else if (cmdsn == sess->exp_cmd_sn) {
254 pr_debug("Received CmdSN matches ExpCmdSN,"
255 " incremented ExpCmdSN to: 0x%08x\n",
257 ret = CMDSN_NORMAL_OPERATION;
259 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
260 pr_debug("Received CmdSN: 0x%08x is greater"
261 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
262 cmdsn, sess->exp_cmd_sn);
263 ret = CMDSN_HIGHER_THAN_EXP;
266 pr_err("Received CmdSN: 0x%08x is less than"
267 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
269 ret = CMDSN_LOWER_THAN_EXP;
276 * Commands may be received out of order if MC/S is in use.
277 * Ensure they are executed in CmdSN order.
279 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
280 unsigned char *buf, __be32 cmdsn)
284 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
286 mutex_lock(&conn->sess->cmdsn_mutex);
288 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
290 case CMDSN_NORMAL_OPERATION:
291 ret = iscsit_execute_cmd(cmd, 0);
292 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
293 iscsit_execute_ooo_cmdsns(conn->sess);
296 ret = CMDSN_ERROR_CANNOT_RECOVER;
299 case CMDSN_HIGHER_THAN_EXP:
300 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
303 ret = CMDSN_ERROR_CANNOT_RECOVER;
306 ret = CMDSN_HIGHER_THAN_EXP;
308 case CMDSN_LOWER_THAN_EXP:
309 case CMDSN_MAXCMDSN_OVERRUN:
311 cmd->i_state = ISTATE_REMOVE;
312 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
314 * Existing callers for iscsit_sequence_cmd() will silently
315 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
316 * return for CMDSN_MAXCMDSN_OVERRUN as well..
318 ret = CMDSN_LOWER_THAN_EXP;
321 mutex_unlock(&conn->sess->cmdsn_mutex);
324 iscsit_reject_cmd(cmd, reason, buf);
328 EXPORT_SYMBOL(iscsit_sequence_cmd);
330 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
332 struct iscsi_conn *conn = cmd->conn;
333 struct se_cmd *se_cmd = &cmd->se_cmd;
334 struct iscsi_data *hdr = (struct iscsi_data *) buf;
335 u32 payload_length = ntoh24(hdr->dlength);
337 if (conn->sess->sess_ops->InitialR2T) {
338 pr_err("Received unexpected unsolicited data"
339 " while InitialR2T=Yes, protocol error.\n");
340 transport_send_check_condition_and_sense(se_cmd,
341 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
345 if ((cmd->first_burst_len + payload_length) >
346 conn->sess->sess_ops->FirstBurstLength) {
347 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
348 " for this Unsolicited DataOut Burst.\n",
349 (cmd->first_burst_len + payload_length),
350 conn->sess->sess_ops->FirstBurstLength);
351 transport_send_check_condition_and_sense(se_cmd,
352 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
356 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
359 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
360 ((cmd->first_burst_len + payload_length) !=
361 conn->sess->sess_ops->FirstBurstLength)) {
362 pr_err("Unsolicited non-immediate data received %u"
363 " does not equal FirstBurstLength: %u, and does"
364 " not equal ExpXferLen %u.\n",
365 (cmd->first_burst_len + payload_length),
366 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
367 transport_send_check_condition_and_sense(se_cmd,
368 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
374 struct iscsi_cmd *iscsit_find_cmd_from_itt(
375 struct iscsi_conn *conn,
378 struct iscsi_cmd *cmd;
380 spin_lock_bh(&conn->cmd_lock);
381 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
382 if (cmd->init_task_tag == init_task_tag) {
383 spin_unlock_bh(&conn->cmd_lock);
387 spin_unlock_bh(&conn->cmd_lock);
389 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
390 init_task_tag, conn->cid);
394 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
399 struct iscsi_cmd *cmd;
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)
405 if (cmd->init_task_tag == init_task_tag) {
406 spin_unlock_bh(&conn->cmd_lock);
410 spin_unlock_bh(&conn->cmd_lock);
412 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
413 " dumping payload\n", init_task_tag, conn->cid);
415 iscsit_dump_data_payload(conn, length, 1);
420 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
421 struct iscsi_conn *conn,
424 struct iscsi_cmd *cmd = NULL;
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);
433 spin_unlock_bh(&conn->cmd_lock);
435 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
436 targ_xfer_tag, conn->cid);
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,
446 struct iscsi_cmd *cmd = NULL;
447 struct iscsi_conn_recovery *cr;
449 * Scan through the inactive connection recovery list's command list.
450 * If init_task_tag matches the command is still alligent.
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);
465 spin_unlock(&cr->conn_recovery_cmd_lock);
467 spin_unlock(&sess->cr_i_lock);
469 * Scan through the active connection recovery list's command list.
470 * If init_task_tag matches the command is ready to be reassigned.
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);
485 spin_unlock(&cr->conn_recovery_cmd_lock);
487 spin_unlock(&sess->cr_a_lock);
492 void iscsit_add_cmd_to_immediate_queue(
493 struct iscsi_cmd *cmd,
494 struct iscsi_conn *conn,
497 struct iscsi_queue_req *qr;
499 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
501 pr_err("Unable to allocate memory for"
502 " struct iscsi_queue_req\n");
505 INIT_LIST_HEAD(&qr->qr_list);
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);
515 wake_up(&conn->queues_wq);
518 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
520 struct iscsi_queue_req *qr;
522 spin_lock_bh(&conn->immed_queue_lock);
523 if (list_empty(&conn->immed_queue_list)) {
524 spin_unlock_bh(&conn->immed_queue_lock);
527 qr = list_first_entry(&conn->immed_queue_list,
528 struct iscsi_queue_req, qr_list);
530 list_del(&qr->qr_list);
532 atomic_dec(&qr->cmd->immed_queue_count);
533 spin_unlock_bh(&conn->immed_queue_lock);
538 static void iscsit_remove_cmd_from_immediate_queue(
539 struct iscsi_cmd *cmd,
540 struct iscsi_conn *conn)
542 struct iscsi_queue_req *qr, *qr_tmp;
544 spin_lock_bh(&conn->immed_queue_lock);
545 if (!atomic_read(&cmd->immed_queue_count)) {
546 spin_unlock_bh(&conn->immed_queue_lock);
550 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
554 atomic_dec(&qr->cmd->immed_queue_count);
555 list_del(&qr->qr_list);
556 kmem_cache_free(lio_qr_cache, qr);
558 spin_unlock_bh(&conn->immed_queue_lock);
560 if (atomic_read(&cmd->immed_queue_count)) {
561 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
563 atomic_read(&cmd->immed_queue_count));
567 void iscsit_add_cmd_to_response_queue(
568 struct iscsi_cmd *cmd,
569 struct iscsi_conn *conn,
572 struct iscsi_queue_req *qr;
574 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
576 pr_err("Unable to allocate memory for"
577 " struct iscsi_queue_req\n");
580 INIT_LIST_HEAD(&qr->qr_list);
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);
589 wake_up(&conn->queues_wq);
592 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
594 struct iscsi_queue_req *qr;
596 spin_lock_bh(&conn->response_queue_lock);
597 if (list_empty(&conn->response_queue_list)) {
598 spin_unlock_bh(&conn->response_queue_lock);
602 qr = list_first_entry(&conn->response_queue_list,
603 struct iscsi_queue_req, qr_list);
605 list_del(&qr->qr_list);
607 atomic_dec(&qr->cmd->response_queue_count);
608 spin_unlock_bh(&conn->response_queue_lock);
613 static void iscsit_remove_cmd_from_response_queue(
614 struct iscsi_cmd *cmd,
615 struct iscsi_conn *conn)
617 struct iscsi_queue_req *qr, *qr_tmp;
619 spin_lock_bh(&conn->response_queue_lock);
620 if (!atomic_read(&cmd->response_queue_count)) {
621 spin_unlock_bh(&conn->response_queue_lock);
625 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
630 atomic_dec(&qr->cmd->response_queue_count);
631 list_del(&qr->qr_list);
632 kmem_cache_free(lio_qr_cache, qr);
634 spin_unlock_bh(&conn->response_queue_lock);
636 if (atomic_read(&cmd->response_queue_count)) {
637 pr_err("ITT: 0x%08x response_queue_count: %d\n",
639 atomic_read(&cmd->response_queue_count));
643 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
647 spin_lock_bh(&conn->immed_queue_lock);
648 empty = list_empty(&conn->immed_queue_list);
649 spin_unlock_bh(&conn->immed_queue_lock);
654 spin_lock_bh(&conn->response_queue_lock);
655 empty = list_empty(&conn->response_queue_list);
656 spin_unlock_bh(&conn->response_queue_lock);
661 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
663 struct iscsi_queue_req *qr, *qr_tmp;
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);
669 atomic_dec(&qr->cmd->immed_queue_count);
671 kmem_cache_free(lio_qr_cache, qr);
673 spin_unlock_bh(&conn->immed_queue_lock);
675 spin_lock_bh(&conn->response_queue_lock);
676 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
678 list_del(&qr->qr_list);
680 atomic_dec(&qr->cmd->response_queue_count);
682 kmem_cache_free(lio_qr_cache, qr);
684 spin_unlock_bh(&conn->response_queue_lock);
687 void iscsit_release_cmd(struct iscsi_cmd *cmd)
689 struct iscsi_session *sess;
690 struct se_cmd *se_cmd = &cmd->se_cmd;
693 sess = cmd->conn->sess;
697 BUG_ON(!sess || !sess->se_sess);
700 kfree(cmd->pdu_list);
701 kfree(cmd->seq_list);
703 kfree(cmd->iov_data);
704 kfree(cmd->text_in_ptr);
706 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
708 EXPORT_SYMBOL(iscsit_release_cmd);
710 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
713 struct iscsi_conn *conn = cmd->conn;
716 if (cmd->data_direction == DMA_TO_DEVICE) {
717 iscsit_stop_dataout_timer(cmd);
718 iscsit_free_r2ts_from_list(cmd);
720 if (cmd->data_direction == DMA_FROM_DEVICE)
721 iscsit_free_all_datain_reqs(cmd);
724 if (conn && check_queues) {
725 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
726 iscsit_remove_cmd_from_response_queue(cmd, conn);
730 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
732 struct se_cmd *se_cmd = NULL;
735 * Determine if a struct se_cmd is associated with
736 * this struct iscsi_cmd.
738 switch (cmd->iscsi_opcode) {
739 case ISCSI_OP_SCSI_CMD:
740 se_cmd = &cmd->se_cmd;
741 __iscsit_free_cmd(cmd, true, shutdown);
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->se_sess, se_cmd);
752 case ISCSI_OP_REJECT:
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.
758 if (cmd->se_cmd.se_tfo != NULL) {
759 se_cmd = &cmd->se_cmd;
760 __iscsit_free_cmd(cmd, true, shutdown);
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->se_sess, se_cmd);
771 __iscsit_free_cmd(cmd, false, shutdown);
772 iscsit_release_cmd(cmd);
777 int iscsit_check_session_usage_count(struct iscsi_session *sess)
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);
786 wait_for_completion(&sess->session_waiting_on_uc_comp);
789 spin_unlock_bh(&sess->session_usage_lock);
794 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
796 spin_lock_bh(&sess->session_usage_lock);
797 sess->session_usage_count--;
799 if (!sess->session_usage_count && sess->session_waiting_on_uc)
800 complete(&sess->session_waiting_on_uc_comp);
802 spin_unlock_bh(&sess->session_usage_lock);
805 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
807 spin_lock_bh(&sess->session_usage_lock);
808 sess->session_usage_count++;
809 spin_unlock_bh(&sess->session_usage_lock);
813 * Setup conn->if_marker and conn->of_marker values based upon
814 * the initial marker-less interval. (see iSCSI v19 A.2)
816 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
818 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
820 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
822 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
823 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
825 if (conn->conn_ops->OFMarker) {
827 * Account for the first Login Command received not
828 * via iscsi_recv_msg().
830 conn->of_marker += ISCSI_HDR_LEN;
831 if (conn->of_marker <= OFMarkInt) {
832 conn->of_marker = (OFMarkInt - conn->of_marker);
834 login_ofmarker_count = (conn->of_marker / OFMarkInt);
835 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
836 (login_ofmarker_count * MARKER_SIZE);
837 conn->of_marker = (next_marker - conn->of_marker);
839 conn->of_marker_offset = 0;
840 pr_debug("Setting OFMarker value to %u based on Initial"
841 " Markerless Interval.\n", conn->of_marker);
844 if (conn->conn_ops->IFMarker) {
845 if (conn->if_marker <= IFMarkInt) {
846 conn->if_marker = (IFMarkInt - conn->if_marker);
848 login_ifmarker_count = (conn->if_marker / IFMarkInt);
849 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
850 (login_ifmarker_count * MARKER_SIZE);
851 conn->if_marker = (next_marker - conn->if_marker);
853 pr_debug("Setting IFMarker value to %u based on Initial"
854 " Markerless Interval.\n", conn->if_marker);
860 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
862 struct iscsi_conn *conn;
864 spin_lock_bh(&sess->conn_lock);
865 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
866 if ((conn->cid == cid) &&
867 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
868 iscsit_inc_conn_usage_count(conn);
869 spin_unlock_bh(&sess->conn_lock);
873 spin_unlock_bh(&sess->conn_lock);
878 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
880 struct iscsi_conn *conn;
882 spin_lock_bh(&sess->conn_lock);
883 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
884 if (conn->cid == cid) {
885 iscsit_inc_conn_usage_count(conn);
886 spin_lock(&conn->state_lock);
887 atomic_set(&conn->connection_wait_rcfr, 1);
888 spin_unlock(&conn->state_lock);
889 spin_unlock_bh(&sess->conn_lock);
893 spin_unlock_bh(&sess->conn_lock);
898 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
900 spin_lock_bh(&conn->conn_usage_lock);
901 if (conn->conn_usage_count != 0) {
902 conn->conn_waiting_on_uc = 1;
903 spin_unlock_bh(&conn->conn_usage_lock);
905 wait_for_completion(&conn->conn_waiting_on_uc_comp);
908 spin_unlock_bh(&conn->conn_usage_lock);
911 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
913 spin_lock_bh(&conn->conn_usage_lock);
914 conn->conn_usage_count--;
916 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
917 complete(&conn->conn_waiting_on_uc_comp);
919 spin_unlock_bh(&conn->conn_usage_lock);
922 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
924 spin_lock_bh(&conn->conn_usage_lock);
925 conn->conn_usage_count++;
926 spin_unlock_bh(&conn->conn_usage_lock);
929 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
932 struct iscsi_cmd *cmd;
934 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
938 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
939 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
940 ISTATE_SEND_NOPIN_NO_RESPONSE;
941 cmd->init_task_tag = RESERVED_ITT;
942 spin_lock_bh(&conn->sess->ttt_lock);
943 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
945 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
946 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
947 spin_unlock_bh(&conn->sess->ttt_lock);
949 spin_lock_bh(&conn->cmd_lock);
950 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
951 spin_unlock_bh(&conn->cmd_lock);
954 iscsit_start_nopin_response_timer(conn);
955 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
960 static void iscsit_handle_nopin_response_timeout(unsigned long data)
962 struct iscsi_conn *conn = (struct iscsi_conn *) data;
964 iscsit_inc_conn_usage_count(conn);
966 spin_lock_bh(&conn->nopin_timer_lock);
967 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
968 spin_unlock_bh(&conn->nopin_timer_lock);
969 iscsit_dec_conn_usage_count(conn);
973 pr_debug("Did not receive response to NOPIN on CID: %hu on"
974 " SID: %u, failing connection.\n", conn->cid,
976 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
977 spin_unlock_bh(&conn->nopin_timer_lock);
980 struct iscsi_portal_group *tpg = conn->sess->tpg;
981 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
984 spin_lock_bh(&tiqn->sess_err_stats.lock);
985 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
986 conn->sess->sess_ops->InitiatorName);
987 tiqn->sess_err_stats.last_sess_failure_type =
988 ISCSI_SESS_ERR_CXN_TIMEOUT;
989 tiqn->sess_err_stats.cxn_timeout_errors++;
990 atomic_long_inc(&conn->sess->conn_timeout_errors);
991 spin_unlock_bh(&tiqn->sess_err_stats.lock);
995 iscsit_cause_connection_reinstatement(conn, 0);
996 iscsit_dec_conn_usage_count(conn);
999 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1001 struct iscsi_session *sess = conn->sess;
1002 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1004 spin_lock_bh(&conn->nopin_timer_lock);
1005 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1006 spin_unlock_bh(&conn->nopin_timer_lock);
1010 mod_timer(&conn->nopin_response_timer,
1011 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1012 spin_unlock_bh(&conn->nopin_timer_lock);
1016 * Called with conn->nopin_timer_lock held.
1018 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1020 struct iscsi_session *sess = conn->sess;
1021 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1023 spin_lock_bh(&conn->nopin_timer_lock);
1024 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1025 spin_unlock_bh(&conn->nopin_timer_lock);
1029 init_timer(&conn->nopin_response_timer);
1030 conn->nopin_response_timer.expires =
1031 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1032 conn->nopin_response_timer.data = (unsigned long)conn;
1033 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1035 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1036 add_timer(&conn->nopin_response_timer);
1038 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1039 " seconds\n", conn->cid, na->nopin_response_timeout);
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1043 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1045 spin_lock_bh(&conn->nopin_timer_lock);
1046 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1047 spin_unlock_bh(&conn->nopin_timer_lock);
1050 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1051 spin_unlock_bh(&conn->nopin_timer_lock);
1053 del_timer_sync(&conn->nopin_response_timer);
1055 spin_lock_bh(&conn->nopin_timer_lock);
1056 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1057 spin_unlock_bh(&conn->nopin_timer_lock);
1060 static void iscsit_handle_nopin_timeout(unsigned long data)
1062 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1064 iscsit_inc_conn_usage_count(conn);
1066 spin_lock_bh(&conn->nopin_timer_lock);
1067 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1069 iscsit_dec_conn_usage_count(conn);
1072 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1073 spin_unlock_bh(&conn->nopin_timer_lock);
1075 iscsit_add_nopin(conn, 1);
1076 iscsit_dec_conn_usage_count(conn);
1080 * Called with conn->nopin_timer_lock held.
1082 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1084 struct iscsi_session *sess = conn->sess;
1085 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1087 * NOPIN timeout is disabled.
1089 if (!na->nopin_timeout)
1092 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1095 init_timer(&conn->nopin_timer);
1096 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1097 conn->nopin_timer.data = (unsigned long)conn;
1098 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1099 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1100 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1101 add_timer(&conn->nopin_timer);
1103 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1104 " interval\n", conn->cid, na->nopin_timeout);
1107 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1109 struct iscsi_session *sess = conn->sess;
1110 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1112 * NOPIN timeout is disabled..
1114 if (!na->nopin_timeout)
1117 spin_lock_bh(&conn->nopin_timer_lock);
1118 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1119 spin_unlock_bh(&conn->nopin_timer_lock);
1123 init_timer(&conn->nopin_timer);
1124 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1125 conn->nopin_timer.data = (unsigned long)conn;
1126 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1127 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1128 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1129 add_timer(&conn->nopin_timer);
1131 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1132 " interval\n", conn->cid, na->nopin_timeout);
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1136 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1138 spin_lock_bh(&conn->nopin_timer_lock);
1139 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1140 spin_unlock_bh(&conn->nopin_timer_lock);
1143 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1144 spin_unlock_bh(&conn->nopin_timer_lock);
1146 del_timer_sync(&conn->nopin_timer);
1148 spin_lock_bh(&conn->nopin_timer_lock);
1149 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1150 spin_unlock_bh(&conn->nopin_timer_lock);
1153 int iscsit_send_tx_data(
1154 struct iscsi_cmd *cmd,
1155 struct iscsi_conn *conn,
1158 int tx_sent, tx_size;
1163 tx_size = cmd->tx_size;
1166 iov = &cmd->iov_data[0];
1167 iov_count = cmd->iov_data_count;
1169 iov = &cmd->iov_misc[0];
1170 iov_count = cmd->iov_misc_count;
1173 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1174 if (tx_size != tx_sent) {
1175 if (tx_sent == -EAGAIN) {
1176 pr_err("tx_data() returned -EAGAIN\n");
1186 int iscsit_fe_sendpage_sg(
1187 struct iscsi_cmd *cmd,
1188 struct iscsi_conn *conn)
1190 struct scatterlist *sg = cmd->first_data_sg;
1192 u32 tx_hdr_size, data_len;
1193 u32 offset = cmd->first_data_sg_off;
1194 int tx_sent, iov_off;
1197 tx_hdr_size = ISCSI_HDR_LEN;
1198 if (conn->conn_ops->HeaderDigest)
1199 tx_hdr_size += ISCSI_CRC_LEN;
1201 iov.iov_base = cmd->pdu;
1202 iov.iov_len = tx_hdr_size;
1204 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1205 if (tx_hdr_size != tx_sent) {
1206 if (tx_sent == -EAGAIN) {
1207 pr_err("tx_data() returned -EAGAIN\n");
1213 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1215 * Set iov_off used by padding and data digest tx_data() calls below
1216 * in order to determine proper offset into cmd->iov_data[]
1218 if (conn->conn_ops->DataDigest) {
1219 data_len -= ISCSI_CRC_LEN;
1221 iov_off = (cmd->iov_data_count - 2);
1223 iov_off = (cmd->iov_data_count - 1);
1225 iov_off = (cmd->iov_data_count - 1);
1228 * Perform sendpage() for each page in the scatterlist
1231 u32 space = (sg->length - offset);
1232 u32 sub_len = min_t(u32, data_len, space);
1234 tx_sent = conn->sock->ops->sendpage(conn->sock,
1235 sg_page(sg), sg->offset + offset, sub_len, 0);
1236 if (tx_sent != sub_len) {
1237 if (tx_sent == -EAGAIN) {
1238 pr_err("tcp_sendpage() returned"
1243 pr_err("tcp_sendpage() failure: %d\n",
1248 data_len -= sub_len;
1255 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1257 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1258 if (cmd->padding != tx_sent) {
1259 if (tx_sent == -EAGAIN) {
1260 pr_err("tx_data() returned -EAGAIN\n");
1268 if (conn->conn_ops->DataDigest) {
1269 struct kvec *iov_d = &cmd->iov_data[iov_off];
1271 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1272 if (ISCSI_CRC_LEN != tx_sent) {
1273 if (tx_sent == -EAGAIN) {
1274 pr_err("tx_data() returned -EAGAIN\n");
1285 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1286 * back to the Initiator when an expection condition occurs with the
1287 * errors set in status_class and status_detail.
1289 * Parameters: iSCSI Connection, Status Class, Status Detail.
1290 * Returns: 0 on success, -1 on error.
1292 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1294 struct iscsi_login_rsp *hdr;
1295 struct iscsi_login *login = conn->conn_login;
1297 login->login_failed = 1;
1298 iscsit_collect_login_stats(conn, status_class, status_detail);
1300 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1302 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1303 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1304 hdr->status_class = status_class;
1305 hdr->status_detail = status_detail;
1306 hdr->itt = conn->login_itt;
1308 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1311 void iscsit_print_session_params(struct iscsi_session *sess)
1313 struct iscsi_conn *conn;
1315 pr_debug("-----------------------------[Session Params for"
1316 " SID: %u]-----------------------------\n", sess->sid);
1317 spin_lock_bh(&sess->conn_lock);
1318 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1319 iscsi_dump_conn_ops(conn->conn_ops);
1320 spin_unlock_bh(&sess->conn_lock);
1322 iscsi_dump_sess_ops(sess->sess_ops);
1325 static int iscsit_do_rx_data(
1326 struct iscsi_conn *conn,
1327 struct iscsi_data_count *count)
1329 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1333 if (!conn || !conn->sock || !conn->conn_ops)
1336 memset(&msg, 0, sizeof(struct msghdr));
1339 iov_len = count->iov_count;
1341 while (total_rx < data) {
1342 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1343 (data - total_rx), MSG_WAITALL);
1345 pr_debug("rx_loop: %d total_rx: %d\n",
1349 total_rx += rx_loop;
1350 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1351 rx_loop, total_rx, data);
1357 static int iscsit_do_tx_data(
1358 struct iscsi_conn *conn,
1359 struct iscsi_data_count *count)
1361 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1365 if (!conn || !conn->sock || !conn->conn_ops)
1369 pr_err("Data length is: %d\n", data);
1373 memset(&msg, 0, sizeof(struct msghdr));
1376 iov_len = count->iov_count;
1378 while (total_tx < data) {
1379 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1382 pr_debug("tx_loop: %d total_tx %d\n",
1386 total_tx += tx_loop;
1387 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1388 tx_loop, total_tx, data);
1395 struct iscsi_conn *conn,
1400 struct iscsi_data_count c;
1402 if (!conn || !conn->sock || !conn->conn_ops)
1405 memset(&c, 0, sizeof(struct iscsi_data_count));
1407 c.iov_count = iov_count;
1408 c.data_length = data;
1409 c.type = ISCSI_RX_DATA;
1411 return iscsit_do_rx_data(conn, &c);
1415 struct iscsi_conn *conn,
1420 struct iscsi_data_count c;
1422 if (!conn || !conn->sock || !conn->conn_ops)
1425 memset(&c, 0, sizeof(struct iscsi_data_count));
1427 c.iov_count = iov_count;
1428 c.data_length = data;
1429 c.type = ISCSI_TX_DATA;
1431 return iscsit_do_tx_data(conn, &c);
1434 void iscsit_collect_login_stats(
1435 struct iscsi_conn *conn,
1439 struct iscsi_param *intrname = NULL;
1440 struct iscsi_tiqn *tiqn;
1441 struct iscsi_login_stats *ls;
1443 tiqn = iscsit_snmp_get_tiqn(conn);
1447 ls = &tiqn->login_stats;
1449 spin_lock(&ls->lock);
1450 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1451 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1452 /* We already have the failure info for this login */
1453 spin_unlock(&ls->lock);
1457 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1459 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1461 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1462 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1463 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1464 ls->authenticate_fails++;
1465 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1466 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1467 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1468 ls->authorize_fails++;
1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1470 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1471 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1472 ls->negotiate_fails++;
1473 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1476 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1479 /* Save initiator name, ip address and time, if it is a failed login */
1480 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1481 if (conn->param_list)
1482 intrname = iscsi_find_param_from_key(INITIATORNAME,
1484 strlcpy(ls->last_intr_fail_name,
1485 (intrname ? intrname->value : "Unknown"),
1486 sizeof(ls->last_intr_fail_name));
1488 ls->last_intr_fail_ip_family = conn->login_family;
1490 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1491 "%s", conn->login_ip);
1492 ls->last_fail_time = get_jiffies_64();
1495 spin_unlock(&ls->lock);
1498 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1500 struct iscsi_portal_group *tpg;
1502 if (!conn || !conn->sess)
1505 tpg = conn->sess->tpg;
1512 return tpg->tpg_tiqn;