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, gfp_t gfp_mask)
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, gfp_mask);
162 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
163 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
164 memset(cmd, 0, size);
166 cmd->se_cmd.map_tag = tag;
168 INIT_LIST_HEAD(&cmd->i_conn_node);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 spin_lock_init(&cmd->datain_lock);
172 spin_lock_init(&cmd->dataout_timeout_lock);
173 spin_lock_init(&cmd->istate_lock);
174 spin_lock_init(&cmd->error_lock);
175 spin_lock_init(&cmd->r2t_lock);
179 EXPORT_SYMBOL(iscsit_allocate_cmd);
181 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
182 struct iscsi_cmd *cmd,
187 for (i = 0; i < cmd->seq_count; i++)
188 if (cmd->seq_list[i].seq_send_order == seq_send_order)
189 return &cmd->seq_list[i];
194 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
198 if (!cmd->seq_list) {
199 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
203 for (i = 0; i < cmd->seq_count; i++) {
204 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
206 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
207 cmd->seq_send_order++;
208 return &cmd->seq_list[i];
215 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
216 struct iscsi_cmd *cmd,
219 struct iscsi_r2t *r2t;
221 spin_lock_bh(&cmd->r2t_lock);
222 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
223 if (r2t->r2t_sn == r2t_sn) {
224 spin_unlock_bh(&cmd->r2t_lock);
228 spin_unlock_bh(&cmd->r2t_lock);
233 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
238 * This is the proper method of checking received CmdSN against
239 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
240 * or order CmdSNs due to multiple connection sessions and/or
243 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
244 pr_err("Received CmdSN: 0x%08x is greater than"
245 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
247 ret = CMDSN_ERROR_CANNOT_RECOVER;
249 } else if (cmdsn == sess->exp_cmd_sn) {
251 pr_debug("Received CmdSN matches ExpCmdSN,"
252 " incremented ExpCmdSN to: 0x%08x\n",
254 ret = CMDSN_NORMAL_OPERATION;
256 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
257 pr_debug("Received CmdSN: 0x%08x is greater"
258 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
259 cmdsn, sess->exp_cmd_sn);
260 ret = CMDSN_HIGHER_THAN_EXP;
263 pr_err("Received CmdSN: 0x%08x is less than"
264 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
266 ret = CMDSN_LOWER_THAN_EXP;
273 * Commands may be received out of order if MC/S is in use.
274 * Ensure they are executed in CmdSN order.
276 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
277 unsigned char *buf, __be32 cmdsn)
281 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
283 mutex_lock(&conn->sess->cmdsn_mutex);
285 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
287 case CMDSN_NORMAL_OPERATION:
288 ret = iscsit_execute_cmd(cmd, 0);
289 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
290 iscsit_execute_ooo_cmdsns(conn->sess);
293 ret = CMDSN_ERROR_CANNOT_RECOVER;
296 case CMDSN_HIGHER_THAN_EXP:
297 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
300 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 ret = CMDSN_HIGHER_THAN_EXP;
305 case CMDSN_LOWER_THAN_EXP:
306 cmd->i_state = ISTATE_REMOVE;
307 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
311 reason = ISCSI_REASON_PROTOCOL_ERROR;
316 mutex_unlock(&conn->sess->cmdsn_mutex);
319 iscsit_reject_cmd(cmd, reason, buf);
323 EXPORT_SYMBOL(iscsit_sequence_cmd);
325 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
327 struct iscsi_conn *conn = cmd->conn;
328 struct se_cmd *se_cmd = &cmd->se_cmd;
329 struct iscsi_data *hdr = (struct iscsi_data *) buf;
330 u32 payload_length = ntoh24(hdr->dlength);
332 if (conn->sess->sess_ops->InitialR2T) {
333 pr_err("Received unexpected unsolicited data"
334 " while InitialR2T=Yes, protocol error.\n");
335 transport_send_check_condition_and_sense(se_cmd,
336 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
340 if ((cmd->first_burst_len + payload_length) >
341 conn->sess->sess_ops->FirstBurstLength) {
342 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
343 " for this Unsolicited DataOut Burst.\n",
344 (cmd->first_burst_len + payload_length),
345 conn->sess->sess_ops->FirstBurstLength);
346 transport_send_check_condition_and_sense(se_cmd,
347 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
351 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
354 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
355 ((cmd->first_burst_len + payload_length) !=
356 conn->sess->sess_ops->FirstBurstLength)) {
357 pr_err("Unsolicited non-immediate data received %u"
358 " does not equal FirstBurstLength: %u, and does"
359 " not equal ExpXferLen %u.\n",
360 (cmd->first_burst_len + payload_length),
361 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
362 transport_send_check_condition_and_sense(se_cmd,
363 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
369 struct iscsi_cmd *iscsit_find_cmd_from_itt(
370 struct iscsi_conn *conn,
373 struct iscsi_cmd *cmd;
375 spin_lock_bh(&conn->cmd_lock);
376 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
377 if (cmd->init_task_tag == init_task_tag) {
378 spin_unlock_bh(&conn->cmd_lock);
382 spin_unlock_bh(&conn->cmd_lock);
384 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
385 init_task_tag, conn->cid);
389 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
390 struct iscsi_conn *conn,
394 struct iscsi_cmd *cmd;
396 spin_lock_bh(&conn->cmd_lock);
397 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
398 if (cmd->init_task_tag == init_task_tag) {
399 spin_unlock_bh(&conn->cmd_lock);
403 spin_unlock_bh(&conn->cmd_lock);
405 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
406 " dumping payload\n", init_task_tag, conn->cid);
408 iscsit_dump_data_payload(conn, length, 1);
413 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
414 struct iscsi_conn *conn,
417 struct iscsi_cmd *cmd = NULL;
419 spin_lock_bh(&conn->cmd_lock);
420 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
421 if (cmd->targ_xfer_tag == targ_xfer_tag) {
422 spin_unlock_bh(&conn->cmd_lock);
426 spin_unlock_bh(&conn->cmd_lock);
428 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
429 targ_xfer_tag, conn->cid);
433 int iscsit_find_cmd_for_recovery(
434 struct iscsi_session *sess,
435 struct iscsi_cmd **cmd_ptr,
436 struct iscsi_conn_recovery **cr_ptr,
439 struct iscsi_cmd *cmd = NULL;
440 struct iscsi_conn_recovery *cr;
442 * Scan through the inactive connection recovery list's command list.
443 * If init_task_tag matches the command is still alligent.
445 spin_lock(&sess->cr_i_lock);
446 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
447 spin_lock(&cr->conn_recovery_cmd_lock);
448 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
449 if (cmd->init_task_tag == init_task_tag) {
450 spin_unlock(&cr->conn_recovery_cmd_lock);
451 spin_unlock(&sess->cr_i_lock);
458 spin_unlock(&cr->conn_recovery_cmd_lock);
460 spin_unlock(&sess->cr_i_lock);
462 * Scan through the active connection recovery list's command list.
463 * If init_task_tag matches the command is ready to be reassigned.
465 spin_lock(&sess->cr_a_lock);
466 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
467 spin_lock(&cr->conn_recovery_cmd_lock);
468 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
469 if (cmd->init_task_tag == init_task_tag) {
470 spin_unlock(&cr->conn_recovery_cmd_lock);
471 spin_unlock(&sess->cr_a_lock);
478 spin_unlock(&cr->conn_recovery_cmd_lock);
480 spin_unlock(&sess->cr_a_lock);
485 void iscsit_add_cmd_to_immediate_queue(
486 struct iscsi_cmd *cmd,
487 struct iscsi_conn *conn,
490 struct iscsi_queue_req *qr;
492 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
494 pr_err("Unable to allocate memory for"
495 " struct iscsi_queue_req\n");
498 INIT_LIST_HEAD(&qr->qr_list);
502 spin_lock_bh(&conn->immed_queue_lock);
503 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
504 atomic_inc(&cmd->immed_queue_count);
505 atomic_set(&conn->check_immediate_queue, 1);
506 spin_unlock_bh(&conn->immed_queue_lock);
508 wake_up(&conn->queues_wq);
511 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
513 struct iscsi_queue_req *qr;
515 spin_lock_bh(&conn->immed_queue_lock);
516 if (list_empty(&conn->immed_queue_list)) {
517 spin_unlock_bh(&conn->immed_queue_lock);
520 qr = list_first_entry(&conn->immed_queue_list,
521 struct iscsi_queue_req, qr_list);
523 list_del(&qr->qr_list);
525 atomic_dec(&qr->cmd->immed_queue_count);
526 spin_unlock_bh(&conn->immed_queue_lock);
531 static void iscsit_remove_cmd_from_immediate_queue(
532 struct iscsi_cmd *cmd,
533 struct iscsi_conn *conn)
535 struct iscsi_queue_req *qr, *qr_tmp;
537 spin_lock_bh(&conn->immed_queue_lock);
538 if (!atomic_read(&cmd->immed_queue_count)) {
539 spin_unlock_bh(&conn->immed_queue_lock);
543 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
547 atomic_dec(&qr->cmd->immed_queue_count);
548 list_del(&qr->qr_list);
549 kmem_cache_free(lio_qr_cache, qr);
551 spin_unlock_bh(&conn->immed_queue_lock);
553 if (atomic_read(&cmd->immed_queue_count)) {
554 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
556 atomic_read(&cmd->immed_queue_count));
560 void iscsit_add_cmd_to_response_queue(
561 struct iscsi_cmd *cmd,
562 struct iscsi_conn *conn,
565 struct iscsi_queue_req *qr;
567 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
569 pr_err("Unable to allocate memory for"
570 " struct iscsi_queue_req\n");
573 INIT_LIST_HEAD(&qr->qr_list);
577 spin_lock_bh(&conn->response_queue_lock);
578 list_add_tail(&qr->qr_list, &conn->response_queue_list);
579 atomic_inc(&cmd->response_queue_count);
580 spin_unlock_bh(&conn->response_queue_lock);
582 wake_up(&conn->queues_wq);
585 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
587 struct iscsi_queue_req *qr;
589 spin_lock_bh(&conn->response_queue_lock);
590 if (list_empty(&conn->response_queue_list)) {
591 spin_unlock_bh(&conn->response_queue_lock);
595 qr = list_first_entry(&conn->response_queue_list,
596 struct iscsi_queue_req, qr_list);
598 list_del(&qr->qr_list);
600 atomic_dec(&qr->cmd->response_queue_count);
601 spin_unlock_bh(&conn->response_queue_lock);
606 static void iscsit_remove_cmd_from_response_queue(
607 struct iscsi_cmd *cmd,
608 struct iscsi_conn *conn)
610 struct iscsi_queue_req *qr, *qr_tmp;
612 spin_lock_bh(&conn->response_queue_lock);
613 if (!atomic_read(&cmd->response_queue_count)) {
614 spin_unlock_bh(&conn->response_queue_lock);
618 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
623 atomic_dec(&qr->cmd->response_queue_count);
624 list_del(&qr->qr_list);
625 kmem_cache_free(lio_qr_cache, qr);
627 spin_unlock_bh(&conn->response_queue_lock);
629 if (atomic_read(&cmd->response_queue_count)) {
630 pr_err("ITT: 0x%08x response_queue_count: %d\n",
632 atomic_read(&cmd->response_queue_count));
636 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
640 spin_lock_bh(&conn->immed_queue_lock);
641 empty = list_empty(&conn->immed_queue_list);
642 spin_unlock_bh(&conn->immed_queue_lock);
647 spin_lock_bh(&conn->response_queue_lock);
648 empty = list_empty(&conn->response_queue_list);
649 spin_unlock_bh(&conn->response_queue_lock);
654 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
656 struct iscsi_queue_req *qr, *qr_tmp;
658 spin_lock_bh(&conn->immed_queue_lock);
659 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
660 list_del(&qr->qr_list);
662 atomic_dec(&qr->cmd->immed_queue_count);
664 kmem_cache_free(lio_qr_cache, qr);
666 spin_unlock_bh(&conn->immed_queue_lock);
668 spin_lock_bh(&conn->response_queue_lock);
669 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
671 list_del(&qr->qr_list);
673 atomic_dec(&qr->cmd->response_queue_count);
675 kmem_cache_free(lio_qr_cache, qr);
677 spin_unlock_bh(&conn->response_queue_lock);
680 void iscsit_release_cmd(struct iscsi_cmd *cmd)
682 struct iscsi_session *sess;
683 struct se_cmd *se_cmd = &cmd->se_cmd;
686 sess = cmd->conn->sess;
690 BUG_ON(!sess || !sess->se_sess);
693 kfree(cmd->pdu_list);
694 kfree(cmd->seq_list);
696 kfree(cmd->iov_data);
697 kfree(cmd->text_in_ptr);
699 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
701 EXPORT_SYMBOL(iscsit_release_cmd);
703 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
706 struct iscsi_conn *conn = cmd->conn;
709 if (cmd->data_direction == DMA_TO_DEVICE) {
710 iscsit_stop_dataout_timer(cmd);
711 iscsit_free_r2ts_from_list(cmd);
713 if (cmd->data_direction == DMA_FROM_DEVICE)
714 iscsit_free_all_datain_reqs(cmd);
717 if (conn && check_queues) {
718 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
719 iscsit_remove_cmd_from_response_queue(cmd, conn);
723 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
725 struct se_cmd *se_cmd = NULL;
728 * Determine if a struct se_cmd is associated with
729 * this struct iscsi_cmd.
731 switch (cmd->iscsi_opcode) {
732 case ISCSI_OP_SCSI_CMD:
733 se_cmd = &cmd->se_cmd;
734 __iscsit_free_cmd(cmd, true, shutdown);
738 case ISCSI_OP_SCSI_TMFUNC:
739 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
740 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
741 __iscsit_free_cmd(cmd, true, shutdown);
742 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
745 case ISCSI_OP_REJECT:
747 * Handle special case for REJECT when iscsi_add_reject*() has
748 * overwritten the original iscsi_opcode assignment, and the
749 * associated cmd->se_cmd needs to be released.
751 if (cmd->se_cmd.se_tfo != NULL) {
752 se_cmd = &cmd->se_cmd;
753 __iscsit_free_cmd(cmd, true, shutdown);
755 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
756 if (!rc && shutdown && se_cmd->se_sess) {
757 __iscsit_free_cmd(cmd, true, shutdown);
758 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
764 __iscsit_free_cmd(cmd, false, shutdown);
765 iscsit_release_cmd(cmd);
770 int iscsit_check_session_usage_count(struct iscsi_session *sess)
772 spin_lock_bh(&sess->session_usage_lock);
773 if (sess->session_usage_count != 0) {
774 sess->session_waiting_on_uc = 1;
775 spin_unlock_bh(&sess->session_usage_lock);
779 wait_for_completion(&sess->session_waiting_on_uc_comp);
782 spin_unlock_bh(&sess->session_usage_lock);
787 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
789 spin_lock_bh(&sess->session_usage_lock);
790 sess->session_usage_count--;
792 if (!sess->session_usage_count && sess->session_waiting_on_uc)
793 complete(&sess->session_waiting_on_uc_comp);
795 spin_unlock_bh(&sess->session_usage_lock);
798 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
800 spin_lock_bh(&sess->session_usage_lock);
801 sess->session_usage_count++;
802 spin_unlock_bh(&sess->session_usage_lock);
806 * Setup conn->if_marker and conn->of_marker values based upon
807 * the initial marker-less interval. (see iSCSI v19 A.2)
809 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
811 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
813 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
815 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
816 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
818 if (conn->conn_ops->OFMarker) {
820 * Account for the first Login Command received not
821 * via iscsi_recv_msg().
823 conn->of_marker += ISCSI_HDR_LEN;
824 if (conn->of_marker <= OFMarkInt) {
825 conn->of_marker = (OFMarkInt - conn->of_marker);
827 login_ofmarker_count = (conn->of_marker / OFMarkInt);
828 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
829 (login_ofmarker_count * MARKER_SIZE);
830 conn->of_marker = (next_marker - conn->of_marker);
832 conn->of_marker_offset = 0;
833 pr_debug("Setting OFMarker value to %u based on Initial"
834 " Markerless Interval.\n", conn->of_marker);
837 if (conn->conn_ops->IFMarker) {
838 if (conn->if_marker <= IFMarkInt) {
839 conn->if_marker = (IFMarkInt - conn->if_marker);
841 login_ifmarker_count = (conn->if_marker / IFMarkInt);
842 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
843 (login_ifmarker_count * MARKER_SIZE);
844 conn->if_marker = (next_marker - conn->if_marker);
846 pr_debug("Setting IFMarker value to %u based on Initial"
847 " Markerless Interval.\n", conn->if_marker);
853 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
855 struct iscsi_conn *conn;
857 spin_lock_bh(&sess->conn_lock);
858 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
859 if ((conn->cid == cid) &&
860 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
861 iscsit_inc_conn_usage_count(conn);
862 spin_unlock_bh(&sess->conn_lock);
866 spin_unlock_bh(&sess->conn_lock);
871 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
873 struct iscsi_conn *conn;
875 spin_lock_bh(&sess->conn_lock);
876 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
877 if (conn->cid == cid) {
878 iscsit_inc_conn_usage_count(conn);
879 spin_lock(&conn->state_lock);
880 atomic_set(&conn->connection_wait_rcfr, 1);
881 spin_unlock(&conn->state_lock);
882 spin_unlock_bh(&sess->conn_lock);
886 spin_unlock_bh(&sess->conn_lock);
891 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
893 spin_lock_bh(&conn->conn_usage_lock);
894 if (conn->conn_usage_count != 0) {
895 conn->conn_waiting_on_uc = 1;
896 spin_unlock_bh(&conn->conn_usage_lock);
898 wait_for_completion(&conn->conn_waiting_on_uc_comp);
901 spin_unlock_bh(&conn->conn_usage_lock);
904 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
906 spin_lock_bh(&conn->conn_usage_lock);
907 conn->conn_usage_count--;
909 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
910 complete(&conn->conn_waiting_on_uc_comp);
912 spin_unlock_bh(&conn->conn_usage_lock);
915 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
917 spin_lock_bh(&conn->conn_usage_lock);
918 conn->conn_usage_count++;
919 spin_unlock_bh(&conn->conn_usage_lock);
922 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
925 struct iscsi_cmd *cmd;
927 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
931 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
932 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
933 ISTATE_SEND_NOPIN_NO_RESPONSE;
934 cmd->init_task_tag = RESERVED_ITT;
935 spin_lock_bh(&conn->sess->ttt_lock);
936 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
938 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
939 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
940 spin_unlock_bh(&conn->sess->ttt_lock);
942 spin_lock_bh(&conn->cmd_lock);
943 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
944 spin_unlock_bh(&conn->cmd_lock);
947 iscsit_start_nopin_response_timer(conn);
948 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
953 static void iscsit_handle_nopin_response_timeout(unsigned long data)
955 struct iscsi_conn *conn = (struct iscsi_conn *) data;
957 iscsit_inc_conn_usage_count(conn);
959 spin_lock_bh(&conn->nopin_timer_lock);
960 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
961 spin_unlock_bh(&conn->nopin_timer_lock);
962 iscsit_dec_conn_usage_count(conn);
966 pr_debug("Did not receive response to NOPIN on CID: %hu on"
967 " SID: %u, failing connection.\n", conn->cid,
969 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
970 spin_unlock_bh(&conn->nopin_timer_lock);
973 struct iscsi_portal_group *tpg = conn->sess->tpg;
974 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
977 spin_lock_bh(&tiqn->sess_err_stats.lock);
978 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
979 conn->sess->sess_ops->InitiatorName);
980 tiqn->sess_err_stats.last_sess_failure_type =
981 ISCSI_SESS_ERR_CXN_TIMEOUT;
982 tiqn->sess_err_stats.cxn_timeout_errors++;
983 atomic_long_inc(&conn->sess->conn_timeout_errors);
984 spin_unlock_bh(&tiqn->sess_err_stats.lock);
988 iscsit_cause_connection_reinstatement(conn, 0);
989 iscsit_dec_conn_usage_count(conn);
992 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
994 struct iscsi_session *sess = conn->sess;
995 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
997 spin_lock_bh(&conn->nopin_timer_lock);
998 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
999 spin_unlock_bh(&conn->nopin_timer_lock);
1003 mod_timer(&conn->nopin_response_timer,
1004 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1005 spin_unlock_bh(&conn->nopin_timer_lock);
1009 * Called with conn->nopin_timer_lock held.
1011 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1013 struct iscsi_session *sess = conn->sess;
1014 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1016 spin_lock_bh(&conn->nopin_timer_lock);
1017 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1018 spin_unlock_bh(&conn->nopin_timer_lock);
1022 init_timer(&conn->nopin_response_timer);
1023 conn->nopin_response_timer.expires =
1024 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1025 conn->nopin_response_timer.data = (unsigned long)conn;
1026 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1027 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1028 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1029 add_timer(&conn->nopin_response_timer);
1031 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1032 " seconds\n", conn->cid, na->nopin_response_timeout);
1033 spin_unlock_bh(&conn->nopin_timer_lock);
1036 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1038 spin_lock_bh(&conn->nopin_timer_lock);
1039 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1043 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1044 spin_unlock_bh(&conn->nopin_timer_lock);
1046 del_timer_sync(&conn->nopin_response_timer);
1048 spin_lock_bh(&conn->nopin_timer_lock);
1049 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1050 spin_unlock_bh(&conn->nopin_timer_lock);
1053 static void iscsit_handle_nopin_timeout(unsigned long data)
1055 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1057 iscsit_inc_conn_usage_count(conn);
1059 spin_lock_bh(&conn->nopin_timer_lock);
1060 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1061 spin_unlock_bh(&conn->nopin_timer_lock);
1062 iscsit_dec_conn_usage_count(conn);
1065 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1068 iscsit_add_nopin(conn, 1);
1069 iscsit_dec_conn_usage_count(conn);
1073 * Called with conn->nopin_timer_lock held.
1075 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1077 struct iscsi_session *sess = conn->sess;
1078 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1080 * NOPIN timeout is disabled.
1082 if (!na->nopin_timeout)
1085 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1088 init_timer(&conn->nopin_timer);
1089 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1090 conn->nopin_timer.data = (unsigned long)conn;
1091 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1092 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1093 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1094 add_timer(&conn->nopin_timer);
1096 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1097 " interval\n", conn->cid, na->nopin_timeout);
1100 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1102 struct iscsi_session *sess = conn->sess;
1103 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1105 * NOPIN timeout is disabled..
1107 if (!na->nopin_timeout)
1110 spin_lock_bh(&conn->nopin_timer_lock);
1111 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1112 spin_unlock_bh(&conn->nopin_timer_lock);
1116 init_timer(&conn->nopin_timer);
1117 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1118 conn->nopin_timer.data = (unsigned long)conn;
1119 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1120 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1121 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1122 add_timer(&conn->nopin_timer);
1124 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1125 " interval\n", conn->cid, na->nopin_timeout);
1126 spin_unlock_bh(&conn->nopin_timer_lock);
1129 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1131 spin_lock_bh(&conn->nopin_timer_lock);
1132 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1136 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1137 spin_unlock_bh(&conn->nopin_timer_lock);
1139 del_timer_sync(&conn->nopin_timer);
1141 spin_lock_bh(&conn->nopin_timer_lock);
1142 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1143 spin_unlock_bh(&conn->nopin_timer_lock);
1146 int iscsit_send_tx_data(
1147 struct iscsi_cmd *cmd,
1148 struct iscsi_conn *conn,
1151 int tx_sent, tx_size;
1156 tx_size = cmd->tx_size;
1159 iov = &cmd->iov_data[0];
1160 iov_count = cmd->iov_data_count;
1162 iov = &cmd->iov_misc[0];
1163 iov_count = cmd->iov_misc_count;
1166 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1167 if (tx_size != tx_sent) {
1168 if (tx_sent == -EAGAIN) {
1169 pr_err("tx_data() returned -EAGAIN\n");
1179 int iscsit_fe_sendpage_sg(
1180 struct iscsi_cmd *cmd,
1181 struct iscsi_conn *conn)
1183 struct scatterlist *sg = cmd->first_data_sg;
1185 u32 tx_hdr_size, data_len;
1186 u32 offset = cmd->first_data_sg_off;
1187 int tx_sent, iov_off;
1190 tx_hdr_size = ISCSI_HDR_LEN;
1191 if (conn->conn_ops->HeaderDigest)
1192 tx_hdr_size += ISCSI_CRC_LEN;
1194 iov.iov_base = cmd->pdu;
1195 iov.iov_len = tx_hdr_size;
1197 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1198 if (tx_hdr_size != tx_sent) {
1199 if (tx_sent == -EAGAIN) {
1200 pr_err("tx_data() returned -EAGAIN\n");
1206 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1208 * Set iov_off used by padding and data digest tx_data() calls below
1209 * in order to determine proper offset into cmd->iov_data[]
1211 if (conn->conn_ops->DataDigest) {
1212 data_len -= ISCSI_CRC_LEN;
1214 iov_off = (cmd->iov_data_count - 2);
1216 iov_off = (cmd->iov_data_count - 1);
1218 iov_off = (cmd->iov_data_count - 1);
1221 * Perform sendpage() for each page in the scatterlist
1224 u32 space = (sg->length - offset);
1225 u32 sub_len = min_t(u32, data_len, space);
1227 tx_sent = conn->sock->ops->sendpage(conn->sock,
1228 sg_page(sg), sg->offset + offset, sub_len, 0);
1229 if (tx_sent != sub_len) {
1230 if (tx_sent == -EAGAIN) {
1231 pr_err("tcp_sendpage() returned"
1236 pr_err("tcp_sendpage() failure: %d\n",
1241 data_len -= sub_len;
1248 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1250 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1251 if (cmd->padding != tx_sent) {
1252 if (tx_sent == -EAGAIN) {
1253 pr_err("tx_data() returned -EAGAIN\n");
1261 if (conn->conn_ops->DataDigest) {
1262 struct kvec *iov_d = &cmd->iov_data[iov_off];
1264 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1265 if (ISCSI_CRC_LEN != tx_sent) {
1266 if (tx_sent == -EAGAIN) {
1267 pr_err("tx_data() returned -EAGAIN\n");
1278 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1279 * back to the Initiator when an expection condition occurs with the
1280 * errors set in status_class and status_detail.
1282 * Parameters: iSCSI Connection, Status Class, Status Detail.
1283 * Returns: 0 on success, -1 on error.
1285 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1287 struct iscsi_login_rsp *hdr;
1288 struct iscsi_login *login = conn->conn_login;
1290 login->login_failed = 1;
1291 iscsit_collect_login_stats(conn, status_class, status_detail);
1293 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1294 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1295 hdr->status_class = status_class;
1296 hdr->status_detail = status_detail;
1297 hdr->itt = conn->login_itt;
1299 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1302 void iscsit_print_session_params(struct iscsi_session *sess)
1304 struct iscsi_conn *conn;
1306 pr_debug("-----------------------------[Session Params for"
1307 " SID: %u]-----------------------------\n", sess->sid);
1308 spin_lock_bh(&sess->conn_lock);
1309 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1310 iscsi_dump_conn_ops(conn->conn_ops);
1311 spin_unlock_bh(&sess->conn_lock);
1313 iscsi_dump_sess_ops(sess->sess_ops);
1316 static int iscsit_do_rx_data(
1317 struct iscsi_conn *conn,
1318 struct iscsi_data_count *count)
1320 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1324 if (!conn || !conn->sock || !conn->conn_ops)
1327 memset(&msg, 0, sizeof(struct msghdr));
1330 iov_len = count->iov_count;
1332 while (total_rx < data) {
1333 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1334 (data - total_rx), MSG_WAITALL);
1336 pr_debug("rx_loop: %d total_rx: %d\n",
1340 total_rx += rx_loop;
1341 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1342 rx_loop, total_rx, data);
1348 static int iscsit_do_tx_data(
1349 struct iscsi_conn *conn,
1350 struct iscsi_data_count *count)
1352 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1356 if (!conn || !conn->sock || !conn->conn_ops)
1360 pr_err("Data length is: %d\n", data);
1364 memset(&msg, 0, sizeof(struct msghdr));
1367 iov_len = count->iov_count;
1369 while (total_tx < data) {
1370 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1373 pr_debug("tx_loop: %d total_tx %d\n",
1377 total_tx += tx_loop;
1378 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1379 tx_loop, total_tx, data);
1386 struct iscsi_conn *conn,
1391 struct iscsi_data_count c;
1393 if (!conn || !conn->sock || !conn->conn_ops)
1396 memset(&c, 0, sizeof(struct iscsi_data_count));
1398 c.iov_count = iov_count;
1399 c.data_length = data;
1400 c.type = ISCSI_RX_DATA;
1402 return iscsit_do_rx_data(conn, &c);
1406 struct iscsi_conn *conn,
1411 struct iscsi_data_count c;
1413 if (!conn || !conn->sock || !conn->conn_ops)
1416 memset(&c, 0, sizeof(struct iscsi_data_count));
1418 c.iov_count = iov_count;
1419 c.data_length = data;
1420 c.type = ISCSI_TX_DATA;
1422 return iscsit_do_tx_data(conn, &c);
1425 void iscsit_collect_login_stats(
1426 struct iscsi_conn *conn,
1430 struct iscsi_param *intrname = NULL;
1431 struct iscsi_tiqn *tiqn;
1432 struct iscsi_login_stats *ls;
1434 tiqn = iscsit_snmp_get_tiqn(conn);
1438 ls = &tiqn->login_stats;
1440 spin_lock(&ls->lock);
1441 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1442 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1443 /* We already have the failure info for this login */
1444 spin_unlock(&ls->lock);
1448 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1450 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1453 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1454 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1455 ls->authenticate_fails++;
1456 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1457 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1458 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1459 ls->authorize_fails++;
1460 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1461 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1462 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1463 ls->negotiate_fails++;
1464 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1467 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1470 /* Save initiator name, ip address and time, if it is a failed login */
1471 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1472 if (conn->param_list)
1473 intrname = iscsi_find_param_from_key(INITIATORNAME,
1475 strcpy(ls->last_intr_fail_name,
1476 (intrname ? intrname->value : "Unknown"));
1478 ls->last_intr_fail_ip_family = conn->login_family;
1480 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1481 "%s", conn->login_ip);
1482 ls->last_fail_time = get_jiffies_64();
1485 spin_unlock(&ls->lock);
1488 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1490 struct iscsi_portal_group *tpg;
1492 if (!conn || !conn->sess)
1495 tpg = conn->sess->tpg;
1502 return tpg->tpg_tiqn;