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 <net/ipv6.h> /* ipv6_addr_equal() */
22 #include <scsi/scsi_tcq.h>
23 #include <scsi/iscsi_proto.h>
24 #include <target/target_core_base.h>
25 #include <target/target_core_fabric.h>
26 #include <target/iscsi/iscsi_transport.h>
28 #include <target/iscsi/iscsi_target_core.h>
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_util.h"
37 #include "iscsi_target.h"
39 #define PRINT_BUFF(buff, len) \
43 pr_debug("%d:\n", __LINE__); \
44 for (zzz = 0; zzz < len; zzz++) { \
45 if (zzz % 16 == 0) { \
48 pr_debug("%4i: ", zzz); \
50 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
56 extern struct list_head g_tiqn_list;
57 extern spinlock_t tiqn_lock;
60 * Called with cmd->r2t_lock held.
62 int iscsit_add_r2t_to_list(
63 struct iscsi_cmd *cmd,
69 struct iscsi_r2t *r2t;
71 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
73 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
76 INIT_LIST_HEAD(&r2t->r2t_list);
78 r2t->recovery_r2t = recovery;
79 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
81 r2t->xfer_len = xfer_len;
82 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
83 spin_unlock_bh(&cmd->r2t_lock);
85 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
87 spin_lock_bh(&cmd->r2t_lock);
91 struct iscsi_r2t *iscsit_get_r2t_for_eos(
92 struct iscsi_cmd *cmd,
96 struct iscsi_r2t *r2t;
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);
106 spin_unlock_bh(&cmd->r2t_lock);
108 pr_err("Unable to locate R2T for Offset: %u, Length:"
109 " %u\n", offset, length);
113 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
115 struct iscsi_r2t *r2t;
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);
124 spin_unlock_bh(&cmd->r2t_lock);
126 pr_err("Unable to locate next R2T to send for ITT:"
127 " 0x%08x.\n", cmd->init_task_tag);
132 * Called with cmd->r2t_lock held.
134 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
136 list_del(&r2t->r2t_list);
137 kmem_cache_free(lio_r2t_cache, r2t);
140 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
142 struct iscsi_r2t *r2t, *r2t_tmp;
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);
151 * May be called from software interrupt (timer) context for allocating
154 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
156 struct iscsi_cmd *cmd;
157 struct se_session *se_sess = conn->sess->se_sess;
160 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
164 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
165 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
166 memset(cmd, 0, size);
168 cmd->se_cmd.map_tag = tag;
170 cmd->data_direction = DMA_NONE;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
179 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
183 EXPORT_SYMBOL(iscsit_allocate_cmd);
185 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
186 struct iscsi_cmd *cmd,
191 for (i = 0; i < cmd->seq_count; i++)
192 if (cmd->seq_list[i].seq_send_order == seq_send_order)
193 return &cmd->seq_list[i];
198 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
202 if (!cmd->seq_list) {
203 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
207 for (i = 0; i < cmd->seq_count; i++) {
208 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
210 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
211 cmd->seq_send_order++;
212 return &cmd->seq_list[i];
219 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
220 struct iscsi_cmd *cmd,
223 struct iscsi_r2t *r2t;
225 spin_lock_bh(&cmd->r2t_lock);
226 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
227 if (r2t->r2t_sn == r2t_sn) {
228 spin_unlock_bh(&cmd->r2t_lock);
232 spin_unlock_bh(&cmd->r2t_lock);
237 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
243 * This is the proper method of checking received CmdSN against
244 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
245 * or order CmdSNs due to multiple connection sessions and/or
248 max_cmdsn = atomic_read(&sess->max_cmd_sn);
249 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
250 pr_err("Received CmdSN: 0x%08x is greater than"
251 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
252 ret = CMDSN_MAXCMDSN_OVERRUN;
254 } else if (cmdsn == sess->exp_cmd_sn) {
256 pr_debug("Received CmdSN matches ExpCmdSN,"
257 " incremented ExpCmdSN to: 0x%08x\n",
259 ret = CMDSN_NORMAL_OPERATION;
261 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
262 pr_debug("Received CmdSN: 0x%08x is greater"
263 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
264 cmdsn, sess->exp_cmd_sn);
265 ret = CMDSN_HIGHER_THAN_EXP;
268 pr_err("Received CmdSN: 0x%08x is less than"
269 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
271 ret = CMDSN_LOWER_THAN_EXP;
278 * Commands may be received out of order if MC/S is in use.
279 * Ensure they are executed in CmdSN order.
281 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
282 unsigned char *buf, __be32 cmdsn)
286 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
288 mutex_lock(&conn->sess->cmdsn_mutex);
290 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
292 case CMDSN_NORMAL_OPERATION:
293 ret = iscsit_execute_cmd(cmd, 0);
294 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
295 iscsit_execute_ooo_cmdsns(conn->sess);
298 ret = CMDSN_ERROR_CANNOT_RECOVER;
301 case CMDSN_HIGHER_THAN_EXP:
302 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
305 ret = CMDSN_ERROR_CANNOT_RECOVER;
308 ret = CMDSN_HIGHER_THAN_EXP;
310 case CMDSN_LOWER_THAN_EXP:
311 case CMDSN_MAXCMDSN_OVERRUN:
313 cmd->i_state = ISTATE_REMOVE;
314 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
316 * Existing callers for iscsit_sequence_cmd() will silently
317 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
318 * return for CMDSN_MAXCMDSN_OVERRUN as well..
320 ret = CMDSN_LOWER_THAN_EXP;
323 mutex_unlock(&conn->sess->cmdsn_mutex);
326 iscsit_reject_cmd(cmd, reason, buf);
330 EXPORT_SYMBOL(iscsit_sequence_cmd);
332 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
334 struct iscsi_conn *conn = cmd->conn;
335 struct se_cmd *se_cmd = &cmd->se_cmd;
336 struct iscsi_data *hdr = (struct iscsi_data *) buf;
337 u32 payload_length = ntoh24(hdr->dlength);
339 if (conn->sess->sess_ops->InitialR2T) {
340 pr_err("Received unexpected unsolicited data"
341 " while InitialR2T=Yes, protocol error.\n");
342 transport_send_check_condition_and_sense(se_cmd,
343 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
347 if ((cmd->first_burst_len + payload_length) >
348 conn->sess->sess_ops->FirstBurstLength) {
349 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
350 " for this Unsolicited DataOut Burst.\n",
351 (cmd->first_burst_len + payload_length),
352 conn->sess->sess_ops->FirstBurstLength);
353 transport_send_check_condition_and_sense(se_cmd,
354 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
358 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
361 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
362 ((cmd->first_burst_len + payload_length) !=
363 conn->sess->sess_ops->FirstBurstLength)) {
364 pr_err("Unsolicited non-immediate data received %u"
365 " does not equal FirstBurstLength: %u, and does"
366 " not equal ExpXferLen %u.\n",
367 (cmd->first_burst_len + payload_length),
368 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
369 transport_send_check_condition_and_sense(se_cmd,
370 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
376 struct iscsi_cmd *iscsit_find_cmd_from_itt(
377 struct iscsi_conn *conn,
380 struct iscsi_cmd *cmd;
382 spin_lock_bh(&conn->cmd_lock);
383 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
384 if (cmd->init_task_tag == init_task_tag) {
385 spin_unlock_bh(&conn->cmd_lock);
389 spin_unlock_bh(&conn->cmd_lock);
391 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
392 init_task_tag, conn->cid);
395 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
397 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
398 struct iscsi_conn *conn,
402 struct iscsi_cmd *cmd;
404 spin_lock_bh(&conn->cmd_lock);
405 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
406 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
408 if (cmd->init_task_tag == init_task_tag) {
409 spin_unlock_bh(&conn->cmd_lock);
413 spin_unlock_bh(&conn->cmd_lock);
415 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
416 " dumping payload\n", init_task_tag, conn->cid);
418 iscsit_dump_data_payload(conn, length, 1);
422 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
424 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
425 struct iscsi_conn *conn,
428 struct iscsi_cmd *cmd = NULL;
430 spin_lock_bh(&conn->cmd_lock);
431 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
432 if (cmd->targ_xfer_tag == targ_xfer_tag) {
433 spin_unlock_bh(&conn->cmd_lock);
437 spin_unlock_bh(&conn->cmd_lock);
439 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
440 targ_xfer_tag, conn->cid);
444 int iscsit_find_cmd_for_recovery(
445 struct iscsi_session *sess,
446 struct iscsi_cmd **cmd_ptr,
447 struct iscsi_conn_recovery **cr_ptr,
450 struct iscsi_cmd *cmd = NULL;
451 struct iscsi_conn_recovery *cr;
453 * Scan through the inactive connection recovery list's command list.
454 * If init_task_tag matches the command is still alligent.
456 spin_lock(&sess->cr_i_lock);
457 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
458 spin_lock(&cr->conn_recovery_cmd_lock);
459 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
460 if (cmd->init_task_tag == init_task_tag) {
461 spin_unlock(&cr->conn_recovery_cmd_lock);
462 spin_unlock(&sess->cr_i_lock);
469 spin_unlock(&cr->conn_recovery_cmd_lock);
471 spin_unlock(&sess->cr_i_lock);
473 * Scan through the active connection recovery list's command list.
474 * If init_task_tag matches the command is ready to be reassigned.
476 spin_lock(&sess->cr_a_lock);
477 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
478 spin_lock(&cr->conn_recovery_cmd_lock);
479 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
480 if (cmd->init_task_tag == init_task_tag) {
481 spin_unlock(&cr->conn_recovery_cmd_lock);
482 spin_unlock(&sess->cr_a_lock);
489 spin_unlock(&cr->conn_recovery_cmd_lock);
491 spin_unlock(&sess->cr_a_lock);
496 void iscsit_add_cmd_to_immediate_queue(
497 struct iscsi_cmd *cmd,
498 struct iscsi_conn *conn,
501 struct iscsi_queue_req *qr;
503 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
505 pr_err("Unable to allocate memory for"
506 " struct iscsi_queue_req\n");
509 INIT_LIST_HEAD(&qr->qr_list);
513 spin_lock_bh(&conn->immed_queue_lock);
514 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
515 atomic_inc(&cmd->immed_queue_count);
516 atomic_set(&conn->check_immediate_queue, 1);
517 spin_unlock_bh(&conn->immed_queue_lock);
519 wake_up(&conn->queues_wq);
521 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
523 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
525 struct iscsi_queue_req *qr;
527 spin_lock_bh(&conn->immed_queue_lock);
528 if (list_empty(&conn->immed_queue_list)) {
529 spin_unlock_bh(&conn->immed_queue_lock);
532 qr = list_first_entry(&conn->immed_queue_list,
533 struct iscsi_queue_req, qr_list);
535 list_del(&qr->qr_list);
537 atomic_dec(&qr->cmd->immed_queue_count);
538 spin_unlock_bh(&conn->immed_queue_lock);
543 static void iscsit_remove_cmd_from_immediate_queue(
544 struct iscsi_cmd *cmd,
545 struct iscsi_conn *conn)
547 struct iscsi_queue_req *qr, *qr_tmp;
549 spin_lock_bh(&conn->immed_queue_lock);
550 if (!atomic_read(&cmd->immed_queue_count)) {
551 spin_unlock_bh(&conn->immed_queue_lock);
555 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
559 atomic_dec(&qr->cmd->immed_queue_count);
560 list_del(&qr->qr_list);
561 kmem_cache_free(lio_qr_cache, qr);
563 spin_unlock_bh(&conn->immed_queue_lock);
565 if (atomic_read(&cmd->immed_queue_count)) {
566 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
568 atomic_read(&cmd->immed_queue_count));
572 int iscsit_add_cmd_to_response_queue(
573 struct iscsi_cmd *cmd,
574 struct iscsi_conn *conn,
577 struct iscsi_queue_req *qr;
579 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
581 pr_err("Unable to allocate memory for"
582 " struct iscsi_queue_req\n");
585 INIT_LIST_HEAD(&qr->qr_list);
589 spin_lock_bh(&conn->response_queue_lock);
590 list_add_tail(&qr->qr_list, &conn->response_queue_list);
591 atomic_inc(&cmd->response_queue_count);
592 spin_unlock_bh(&conn->response_queue_lock);
594 wake_up(&conn->queues_wq);
598 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
600 struct iscsi_queue_req *qr;
602 spin_lock_bh(&conn->response_queue_lock);
603 if (list_empty(&conn->response_queue_list)) {
604 spin_unlock_bh(&conn->response_queue_lock);
608 qr = list_first_entry(&conn->response_queue_list,
609 struct iscsi_queue_req, qr_list);
611 list_del(&qr->qr_list);
613 atomic_dec(&qr->cmd->response_queue_count);
614 spin_unlock_bh(&conn->response_queue_lock);
619 static void iscsit_remove_cmd_from_response_queue(
620 struct iscsi_cmd *cmd,
621 struct iscsi_conn *conn)
623 struct iscsi_queue_req *qr, *qr_tmp;
625 spin_lock_bh(&conn->response_queue_lock);
626 if (!atomic_read(&cmd->response_queue_count)) {
627 spin_unlock_bh(&conn->response_queue_lock);
631 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
636 atomic_dec(&qr->cmd->response_queue_count);
637 list_del(&qr->qr_list);
638 kmem_cache_free(lio_qr_cache, qr);
640 spin_unlock_bh(&conn->response_queue_lock);
642 if (atomic_read(&cmd->response_queue_count)) {
643 pr_err("ITT: 0x%08x response_queue_count: %d\n",
645 atomic_read(&cmd->response_queue_count));
649 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
653 spin_lock_bh(&conn->immed_queue_lock);
654 empty = list_empty(&conn->immed_queue_list);
655 spin_unlock_bh(&conn->immed_queue_lock);
660 spin_lock_bh(&conn->response_queue_lock);
661 empty = list_empty(&conn->response_queue_list);
662 spin_unlock_bh(&conn->response_queue_lock);
667 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
669 struct iscsi_queue_req *qr, *qr_tmp;
671 spin_lock_bh(&conn->immed_queue_lock);
672 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
673 list_del(&qr->qr_list);
675 atomic_dec(&qr->cmd->immed_queue_count);
677 kmem_cache_free(lio_qr_cache, qr);
679 spin_unlock_bh(&conn->immed_queue_lock);
681 spin_lock_bh(&conn->response_queue_lock);
682 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
684 list_del(&qr->qr_list);
686 atomic_dec(&qr->cmd->response_queue_count);
688 kmem_cache_free(lio_qr_cache, qr);
690 spin_unlock_bh(&conn->response_queue_lock);
693 void iscsit_release_cmd(struct iscsi_cmd *cmd)
695 struct iscsi_session *sess;
696 struct se_cmd *se_cmd = &cmd->se_cmd;
699 sess = cmd->conn->sess;
703 BUG_ON(!sess || !sess->se_sess);
706 kfree(cmd->pdu_list);
707 kfree(cmd->seq_list);
709 kfree(cmd->iov_data);
710 kfree(cmd->text_in_ptr);
712 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
714 EXPORT_SYMBOL(iscsit_release_cmd);
716 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
718 struct iscsi_conn *conn = cmd->conn;
720 if (cmd->data_direction == DMA_TO_DEVICE) {
721 iscsit_stop_dataout_timer(cmd);
722 iscsit_free_r2ts_from_list(cmd);
724 if (cmd->data_direction == DMA_FROM_DEVICE)
725 iscsit_free_all_datain_reqs(cmd);
727 if (conn && check_queues) {
728 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
729 iscsit_remove_cmd_from_response_queue(cmd, conn);
732 if (conn && conn->conn_transport->iscsit_release_cmd)
733 conn->conn_transport->iscsit_release_cmd(conn, cmd);
736 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
738 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
741 __iscsit_free_cmd(cmd, shutdown);
743 rc = transport_generic_free_cmd(se_cmd, shutdown);
744 if (!rc && shutdown && se_cmd->se_sess) {
745 __iscsit_free_cmd(cmd, shutdown);
746 target_put_sess_cmd(se_cmd);
749 iscsit_release_cmd(cmd);
752 EXPORT_SYMBOL(iscsit_free_cmd);
754 int iscsit_check_session_usage_count(struct iscsi_session *sess)
756 spin_lock_bh(&sess->session_usage_lock);
757 if (sess->session_usage_count != 0) {
758 sess->session_waiting_on_uc = 1;
759 spin_unlock_bh(&sess->session_usage_lock);
763 wait_for_completion(&sess->session_waiting_on_uc_comp);
766 spin_unlock_bh(&sess->session_usage_lock);
771 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
773 spin_lock_bh(&sess->session_usage_lock);
774 sess->session_usage_count--;
776 if (!sess->session_usage_count && sess->session_waiting_on_uc)
777 complete(&sess->session_waiting_on_uc_comp);
779 spin_unlock_bh(&sess->session_usage_lock);
782 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
784 spin_lock_bh(&sess->session_usage_lock);
785 sess->session_usage_count++;
786 spin_unlock_bh(&sess->session_usage_lock);
789 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
791 struct iscsi_conn *conn;
793 spin_lock_bh(&sess->conn_lock);
794 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
795 if ((conn->cid == cid) &&
796 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
797 iscsit_inc_conn_usage_count(conn);
798 spin_unlock_bh(&sess->conn_lock);
802 spin_unlock_bh(&sess->conn_lock);
807 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
809 struct iscsi_conn *conn;
811 spin_lock_bh(&sess->conn_lock);
812 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
813 if (conn->cid == cid) {
814 iscsit_inc_conn_usage_count(conn);
815 spin_lock(&conn->state_lock);
816 atomic_set(&conn->connection_wait_rcfr, 1);
817 spin_unlock(&conn->state_lock);
818 spin_unlock_bh(&sess->conn_lock);
822 spin_unlock_bh(&sess->conn_lock);
827 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
829 spin_lock_bh(&conn->conn_usage_lock);
830 if (conn->conn_usage_count != 0) {
831 conn->conn_waiting_on_uc = 1;
832 spin_unlock_bh(&conn->conn_usage_lock);
834 wait_for_completion(&conn->conn_waiting_on_uc_comp);
837 spin_unlock_bh(&conn->conn_usage_lock);
840 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
842 spin_lock_bh(&conn->conn_usage_lock);
843 conn->conn_usage_count--;
845 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
846 complete(&conn->conn_waiting_on_uc_comp);
848 spin_unlock_bh(&conn->conn_usage_lock);
851 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
853 spin_lock_bh(&conn->conn_usage_lock);
854 conn->conn_usage_count++;
855 spin_unlock_bh(&conn->conn_usage_lock);
858 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
861 struct iscsi_cmd *cmd;
863 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
867 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
868 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
869 ISTATE_SEND_NOPIN_NO_RESPONSE;
870 cmd->init_task_tag = RESERVED_ITT;
871 cmd->targ_xfer_tag = (want_response) ?
872 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
873 spin_lock_bh(&conn->cmd_lock);
874 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
875 spin_unlock_bh(&conn->cmd_lock);
878 iscsit_start_nopin_response_timer(conn);
879 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
884 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
886 struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
888 iscsit_inc_conn_usage_count(conn);
890 spin_lock_bh(&conn->nopin_timer_lock);
891 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
892 spin_unlock_bh(&conn->nopin_timer_lock);
893 iscsit_dec_conn_usage_count(conn);
897 pr_debug("Did not receive response to NOPIN on CID: %hu on"
898 " SID: %u, failing connection.\n", conn->cid,
900 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
901 spin_unlock_bh(&conn->nopin_timer_lock);
904 struct iscsi_portal_group *tpg = conn->sess->tpg;
905 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
908 spin_lock_bh(&tiqn->sess_err_stats.lock);
909 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
910 conn->sess->sess_ops->InitiatorName);
911 tiqn->sess_err_stats.last_sess_failure_type =
912 ISCSI_SESS_ERR_CXN_TIMEOUT;
913 tiqn->sess_err_stats.cxn_timeout_errors++;
914 atomic_long_inc(&conn->sess->conn_timeout_errors);
915 spin_unlock_bh(&tiqn->sess_err_stats.lock);
919 iscsit_cause_connection_reinstatement(conn, 0);
920 iscsit_dec_conn_usage_count(conn);
923 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
925 struct iscsi_session *sess = conn->sess;
926 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
928 spin_lock_bh(&conn->nopin_timer_lock);
929 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
930 spin_unlock_bh(&conn->nopin_timer_lock);
934 mod_timer(&conn->nopin_response_timer,
935 (get_jiffies_64() + na->nopin_response_timeout * HZ));
936 spin_unlock_bh(&conn->nopin_timer_lock);
940 * Called with conn->nopin_timer_lock held.
942 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
944 struct iscsi_session *sess = conn->sess;
945 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
947 spin_lock_bh(&conn->nopin_timer_lock);
948 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
949 spin_unlock_bh(&conn->nopin_timer_lock);
953 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
954 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
955 mod_timer(&conn->nopin_response_timer,
956 jiffies + na->nopin_response_timeout * HZ);
958 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
959 " seconds\n", conn->cid, na->nopin_response_timeout);
960 spin_unlock_bh(&conn->nopin_timer_lock);
963 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
965 spin_lock_bh(&conn->nopin_timer_lock);
966 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
967 spin_unlock_bh(&conn->nopin_timer_lock);
970 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
971 spin_unlock_bh(&conn->nopin_timer_lock);
973 del_timer_sync(&conn->nopin_response_timer);
975 spin_lock_bh(&conn->nopin_timer_lock);
976 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
977 spin_unlock_bh(&conn->nopin_timer_lock);
980 void iscsit_handle_nopin_timeout(struct timer_list *t)
982 struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
984 iscsit_inc_conn_usage_count(conn);
986 spin_lock_bh(&conn->nopin_timer_lock);
987 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
988 spin_unlock_bh(&conn->nopin_timer_lock);
989 iscsit_dec_conn_usage_count(conn);
992 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
993 spin_unlock_bh(&conn->nopin_timer_lock);
995 iscsit_add_nopin(conn, 1);
996 iscsit_dec_conn_usage_count(conn);
1000 * Called with conn->nopin_timer_lock held.
1002 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1004 struct iscsi_session *sess = conn->sess;
1005 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1007 * NOPIN timeout is disabled.
1009 if (!na->nopin_timeout)
1012 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1015 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1016 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1017 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1019 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1020 " interval\n", conn->cid, na->nopin_timeout);
1023 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1025 struct iscsi_session *sess = conn->sess;
1026 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1028 * NOPIN timeout is disabled..
1030 if (!na->nopin_timeout)
1033 spin_lock_bh(&conn->nopin_timer_lock);
1034 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1035 spin_unlock_bh(&conn->nopin_timer_lock);
1039 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1040 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1041 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1043 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1044 " interval\n", conn->cid, na->nopin_timeout);
1045 spin_unlock_bh(&conn->nopin_timer_lock);
1048 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1050 spin_lock_bh(&conn->nopin_timer_lock);
1051 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1052 spin_unlock_bh(&conn->nopin_timer_lock);
1055 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1056 spin_unlock_bh(&conn->nopin_timer_lock);
1058 del_timer_sync(&conn->nopin_timer);
1060 spin_lock_bh(&conn->nopin_timer_lock);
1061 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1062 spin_unlock_bh(&conn->nopin_timer_lock);
1065 int iscsit_send_tx_data(
1066 struct iscsi_cmd *cmd,
1067 struct iscsi_conn *conn,
1070 int tx_sent, tx_size;
1075 tx_size = cmd->tx_size;
1078 iov = &cmd->iov_data[0];
1079 iov_count = cmd->iov_data_count;
1081 iov = &cmd->iov_misc[0];
1082 iov_count = cmd->iov_misc_count;
1085 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1086 if (tx_size != tx_sent) {
1087 if (tx_sent == -EAGAIN) {
1088 pr_err("tx_data() returned -EAGAIN\n");
1098 int iscsit_fe_sendpage_sg(
1099 struct iscsi_cmd *cmd,
1100 struct iscsi_conn *conn)
1102 struct scatterlist *sg = cmd->first_data_sg;
1104 u32 tx_hdr_size, data_len;
1105 u32 offset = cmd->first_data_sg_off;
1106 int tx_sent, iov_off;
1109 tx_hdr_size = ISCSI_HDR_LEN;
1110 if (conn->conn_ops->HeaderDigest)
1111 tx_hdr_size += ISCSI_CRC_LEN;
1113 iov.iov_base = cmd->pdu;
1114 iov.iov_len = tx_hdr_size;
1116 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1117 if (tx_hdr_size != tx_sent) {
1118 if (tx_sent == -EAGAIN) {
1119 pr_err("tx_data() returned -EAGAIN\n");
1125 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1127 * Set iov_off used by padding and data digest tx_data() calls below
1128 * in order to determine proper offset into cmd->iov_data[]
1130 if (conn->conn_ops->DataDigest) {
1131 data_len -= ISCSI_CRC_LEN;
1133 iov_off = (cmd->iov_data_count - 2);
1135 iov_off = (cmd->iov_data_count - 1);
1137 iov_off = (cmd->iov_data_count - 1);
1140 * Perform sendpage() for each page in the scatterlist
1143 u32 space = (sg->length - offset);
1144 u32 sub_len = min_t(u32, data_len, space);
1146 tx_sent = conn->sock->ops->sendpage(conn->sock,
1147 sg_page(sg), sg->offset + offset, sub_len, 0);
1148 if (tx_sent != sub_len) {
1149 if (tx_sent == -EAGAIN) {
1150 pr_err("tcp_sendpage() returned"
1155 pr_err("tcp_sendpage() failure: %d\n",
1160 data_len -= sub_len;
1167 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1169 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1170 if (cmd->padding != tx_sent) {
1171 if (tx_sent == -EAGAIN) {
1172 pr_err("tx_data() returned -EAGAIN\n");
1180 if (conn->conn_ops->DataDigest) {
1181 struct kvec *iov_d = &cmd->iov_data[iov_off];
1183 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1184 if (ISCSI_CRC_LEN != tx_sent) {
1185 if (tx_sent == -EAGAIN) {
1186 pr_err("tx_data() returned -EAGAIN\n");
1197 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1198 * back to the Initiator when an expection condition occurs with the
1199 * errors set in status_class and status_detail.
1201 * Parameters: iSCSI Connection, Status Class, Status Detail.
1202 * Returns: 0 on success, -1 on error.
1204 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1206 struct iscsi_login_rsp *hdr;
1207 struct iscsi_login *login = conn->conn_login;
1209 login->login_failed = 1;
1210 iscsit_collect_login_stats(conn, status_class, status_detail);
1212 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1214 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1215 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1216 hdr->status_class = status_class;
1217 hdr->status_detail = status_detail;
1218 hdr->itt = conn->login_itt;
1220 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1223 void iscsit_print_session_params(struct iscsi_session *sess)
1225 struct iscsi_conn *conn;
1227 pr_debug("-----------------------------[Session Params for"
1228 " SID: %u]-----------------------------\n", sess->sid);
1229 spin_lock_bh(&sess->conn_lock);
1230 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1231 iscsi_dump_conn_ops(conn->conn_ops);
1232 spin_unlock_bh(&sess->conn_lock);
1234 iscsi_dump_sess_ops(sess->sess_ops);
1237 static int iscsit_do_rx_data(
1238 struct iscsi_conn *conn,
1239 struct iscsi_data_count *count)
1241 int data = count->data_length, rx_loop = 0, total_rx = 0;
1244 if (!conn || !conn->sock || !conn->conn_ops)
1247 memset(&msg, 0, sizeof(struct msghdr));
1248 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1249 count->iov, count->iov_count, data);
1251 while (msg_data_left(&msg)) {
1252 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1254 pr_debug("rx_loop: %d total_rx: %d\n",
1258 total_rx += rx_loop;
1259 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1260 rx_loop, total_rx, data);
1267 struct iscsi_conn *conn,
1272 struct iscsi_data_count c;
1274 if (!conn || !conn->sock || !conn->conn_ops)
1277 memset(&c, 0, sizeof(struct iscsi_data_count));
1279 c.iov_count = iov_count;
1280 c.data_length = data;
1281 c.type = ISCSI_RX_DATA;
1283 return iscsit_do_rx_data(conn, &c);
1287 struct iscsi_conn *conn,
1295 if (!conn || !conn->sock || !conn->conn_ops)
1299 pr_err("Data length is: %d\n", data);
1303 memset(&msg, 0, sizeof(struct msghdr));
1305 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
1306 iov, iov_count, data);
1308 while (msg_data_left(&msg)) {
1309 int tx_loop = sock_sendmsg(conn->sock, &msg);
1311 pr_debug("tx_loop: %d total_tx %d\n",
1315 total_tx += tx_loop;
1316 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1317 tx_loop, total_tx, data);
1323 void iscsit_collect_login_stats(
1324 struct iscsi_conn *conn,
1328 struct iscsi_param *intrname = NULL;
1329 struct iscsi_tiqn *tiqn;
1330 struct iscsi_login_stats *ls;
1332 tiqn = iscsit_snmp_get_tiqn(conn);
1336 ls = &tiqn->login_stats;
1338 spin_lock(&ls->lock);
1339 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1341 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1343 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1344 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1345 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1346 ls->authenticate_fails++;
1347 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1348 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1349 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1350 ls->authorize_fails++;
1351 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1352 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1353 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1354 ls->negotiate_fails++;
1355 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1358 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1361 /* Save initiator name, ip address and time, if it is a failed login */
1362 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1363 if (conn->param_list)
1364 intrname = iscsi_find_param_from_key(INITIATORNAME,
1366 strlcpy(ls->last_intr_fail_name,
1367 (intrname ? intrname->value : "Unknown"),
1368 sizeof(ls->last_intr_fail_name));
1370 ls->last_intr_fail_ip_family = conn->login_family;
1372 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1373 ls->last_fail_time = get_jiffies_64();
1376 spin_unlock(&ls->lock);
1379 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1381 struct iscsi_portal_group *tpg;
1393 return tpg->tpg_tiqn;