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);
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)
242 * This is the proper method of checking received CmdSN against
243 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
244 * or order CmdSNs due to multiple connection sessions and/or
247 max_cmdsn = atomic_read(&sess->max_cmd_sn);
248 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
249 pr_err("Received CmdSN: 0x%08x is greater than"
250 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
251 ret = CMDSN_MAXCMDSN_OVERRUN;
253 } else if (cmdsn == sess->exp_cmd_sn) {
255 pr_debug("Received CmdSN matches ExpCmdSN,"
256 " incremented ExpCmdSN to: 0x%08x\n",
258 ret = CMDSN_NORMAL_OPERATION;
260 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
261 pr_debug("Received CmdSN: 0x%08x is greater"
262 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
263 cmdsn, sess->exp_cmd_sn);
264 ret = CMDSN_HIGHER_THAN_EXP;
267 pr_err("Received CmdSN: 0x%08x is less than"
268 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
270 ret = CMDSN_LOWER_THAN_EXP;
277 * Commands may be received out of order if MC/S is in use.
278 * Ensure they are executed in CmdSN order.
280 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
281 unsigned char *buf, __be32 cmdsn)
285 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
287 mutex_lock(&conn->sess->cmdsn_mutex);
289 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
291 case CMDSN_NORMAL_OPERATION:
292 ret = iscsit_execute_cmd(cmd, 0);
293 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
294 iscsit_execute_ooo_cmdsns(conn->sess);
297 ret = CMDSN_ERROR_CANNOT_RECOVER;
300 case CMDSN_HIGHER_THAN_EXP:
301 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
304 ret = CMDSN_ERROR_CANNOT_RECOVER;
307 ret = CMDSN_HIGHER_THAN_EXP;
309 case CMDSN_LOWER_THAN_EXP:
310 case CMDSN_MAXCMDSN_OVERRUN:
312 cmd->i_state = ISTATE_REMOVE;
313 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
315 * Existing callers for iscsit_sequence_cmd() will silently
316 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
317 * return for CMDSN_MAXCMDSN_OVERRUN as well..
319 ret = CMDSN_LOWER_THAN_EXP;
322 mutex_unlock(&conn->sess->cmdsn_mutex);
325 iscsit_reject_cmd(cmd, reason, buf);
329 EXPORT_SYMBOL(iscsit_sequence_cmd);
331 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
333 struct iscsi_conn *conn = cmd->conn;
334 struct se_cmd *se_cmd = &cmd->se_cmd;
335 struct iscsi_data *hdr = (struct iscsi_data *) buf;
336 u32 payload_length = ntoh24(hdr->dlength);
338 if (conn->sess->sess_ops->InitialR2T) {
339 pr_err("Received unexpected unsolicited data"
340 " while InitialR2T=Yes, protocol error.\n");
341 transport_send_check_condition_and_sense(se_cmd,
342 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
346 if ((cmd->first_burst_len + payload_length) >
347 conn->sess->sess_ops->FirstBurstLength) {
348 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
349 " for this Unsolicited DataOut Burst.\n",
350 (cmd->first_burst_len + payload_length),
351 conn->sess->sess_ops->FirstBurstLength);
352 transport_send_check_condition_and_sense(se_cmd,
353 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
357 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
360 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
361 ((cmd->first_burst_len + payload_length) !=
362 conn->sess->sess_ops->FirstBurstLength)) {
363 pr_err("Unsolicited non-immediate data received %u"
364 " does not equal FirstBurstLength: %u, and does"
365 " not equal ExpXferLen %u.\n",
366 (cmd->first_burst_len + payload_length),
367 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
368 transport_send_check_condition_and_sense(se_cmd,
369 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
375 struct iscsi_cmd *iscsit_find_cmd_from_itt(
376 struct iscsi_conn *conn,
379 struct iscsi_cmd *cmd;
381 spin_lock_bh(&conn->cmd_lock);
382 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
383 if (cmd->init_task_tag == init_task_tag) {
384 spin_unlock_bh(&conn->cmd_lock);
388 spin_unlock_bh(&conn->cmd_lock);
390 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
391 init_task_tag, conn->cid);
394 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
396 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
397 struct iscsi_conn *conn,
401 struct iscsi_cmd *cmd;
403 spin_lock_bh(&conn->cmd_lock);
404 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
405 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
407 if (cmd->init_task_tag == init_task_tag) {
408 spin_unlock_bh(&conn->cmd_lock);
412 spin_unlock_bh(&conn->cmd_lock);
414 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
415 " dumping payload\n", init_task_tag, conn->cid);
417 iscsit_dump_data_payload(conn, length, 1);
421 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
423 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
424 struct iscsi_conn *conn,
427 struct iscsi_cmd *cmd = NULL;
429 spin_lock_bh(&conn->cmd_lock);
430 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
431 if (cmd->targ_xfer_tag == targ_xfer_tag) {
432 spin_unlock_bh(&conn->cmd_lock);
436 spin_unlock_bh(&conn->cmd_lock);
438 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
439 targ_xfer_tag, conn->cid);
443 int iscsit_find_cmd_for_recovery(
444 struct iscsi_session *sess,
445 struct iscsi_cmd **cmd_ptr,
446 struct iscsi_conn_recovery **cr_ptr,
449 struct iscsi_cmd *cmd = NULL;
450 struct iscsi_conn_recovery *cr;
452 * Scan through the inactive connection recovery list's command list.
453 * If init_task_tag matches the command is still alligent.
455 spin_lock(&sess->cr_i_lock);
456 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
457 spin_lock(&cr->conn_recovery_cmd_lock);
458 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
459 if (cmd->init_task_tag == init_task_tag) {
460 spin_unlock(&cr->conn_recovery_cmd_lock);
461 spin_unlock(&sess->cr_i_lock);
468 spin_unlock(&cr->conn_recovery_cmd_lock);
470 spin_unlock(&sess->cr_i_lock);
472 * Scan through the active connection recovery list's command list.
473 * If init_task_tag matches the command is ready to be reassigned.
475 spin_lock(&sess->cr_a_lock);
476 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
477 spin_lock(&cr->conn_recovery_cmd_lock);
478 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
479 if (cmd->init_task_tag == init_task_tag) {
480 spin_unlock(&cr->conn_recovery_cmd_lock);
481 spin_unlock(&sess->cr_a_lock);
488 spin_unlock(&cr->conn_recovery_cmd_lock);
490 spin_unlock(&sess->cr_a_lock);
495 void iscsit_add_cmd_to_immediate_queue(
496 struct iscsi_cmd *cmd,
497 struct iscsi_conn *conn,
500 struct iscsi_queue_req *qr;
502 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
504 pr_err("Unable to allocate memory for"
505 " struct iscsi_queue_req\n");
508 INIT_LIST_HEAD(&qr->qr_list);
512 spin_lock_bh(&conn->immed_queue_lock);
513 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
514 atomic_inc(&cmd->immed_queue_count);
515 atomic_set(&conn->check_immediate_queue, 1);
516 spin_unlock_bh(&conn->immed_queue_lock);
518 wake_up(&conn->queues_wq);
520 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
522 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
524 struct iscsi_queue_req *qr;
526 spin_lock_bh(&conn->immed_queue_lock);
527 if (list_empty(&conn->immed_queue_list)) {
528 spin_unlock_bh(&conn->immed_queue_lock);
531 qr = list_first_entry(&conn->immed_queue_list,
532 struct iscsi_queue_req, qr_list);
534 list_del(&qr->qr_list);
536 atomic_dec(&qr->cmd->immed_queue_count);
537 spin_unlock_bh(&conn->immed_queue_lock);
542 static void iscsit_remove_cmd_from_immediate_queue(
543 struct iscsi_cmd *cmd,
544 struct iscsi_conn *conn)
546 struct iscsi_queue_req *qr, *qr_tmp;
548 spin_lock_bh(&conn->immed_queue_lock);
549 if (!atomic_read(&cmd->immed_queue_count)) {
550 spin_unlock_bh(&conn->immed_queue_lock);
554 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
558 atomic_dec(&qr->cmd->immed_queue_count);
559 list_del(&qr->qr_list);
560 kmem_cache_free(lio_qr_cache, qr);
562 spin_unlock_bh(&conn->immed_queue_lock);
564 if (atomic_read(&cmd->immed_queue_count)) {
565 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
567 atomic_read(&cmd->immed_queue_count));
571 int iscsit_add_cmd_to_response_queue(
572 struct iscsi_cmd *cmd,
573 struct iscsi_conn *conn,
576 struct iscsi_queue_req *qr;
578 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
580 pr_err("Unable to allocate memory for"
581 " struct iscsi_queue_req\n");
584 INIT_LIST_HEAD(&qr->qr_list);
588 spin_lock_bh(&conn->response_queue_lock);
589 list_add_tail(&qr->qr_list, &conn->response_queue_list);
590 atomic_inc(&cmd->response_queue_count);
591 spin_unlock_bh(&conn->response_queue_lock);
593 wake_up(&conn->queues_wq);
597 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
599 struct iscsi_queue_req *qr;
601 spin_lock_bh(&conn->response_queue_lock);
602 if (list_empty(&conn->response_queue_list)) {
603 spin_unlock_bh(&conn->response_queue_lock);
607 qr = list_first_entry(&conn->response_queue_list,
608 struct iscsi_queue_req, qr_list);
610 list_del(&qr->qr_list);
612 atomic_dec(&qr->cmd->response_queue_count);
613 spin_unlock_bh(&conn->response_queue_lock);
618 static void iscsit_remove_cmd_from_response_queue(
619 struct iscsi_cmd *cmd,
620 struct iscsi_conn *conn)
622 struct iscsi_queue_req *qr, *qr_tmp;
624 spin_lock_bh(&conn->response_queue_lock);
625 if (!atomic_read(&cmd->response_queue_count)) {
626 spin_unlock_bh(&conn->response_queue_lock);
630 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
635 atomic_dec(&qr->cmd->response_queue_count);
636 list_del(&qr->qr_list);
637 kmem_cache_free(lio_qr_cache, qr);
639 spin_unlock_bh(&conn->response_queue_lock);
641 if (atomic_read(&cmd->response_queue_count)) {
642 pr_err("ITT: 0x%08x response_queue_count: %d\n",
644 atomic_read(&cmd->response_queue_count));
648 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
652 spin_lock_bh(&conn->immed_queue_lock);
653 empty = list_empty(&conn->immed_queue_list);
654 spin_unlock_bh(&conn->immed_queue_lock);
659 spin_lock_bh(&conn->response_queue_lock);
660 empty = list_empty(&conn->response_queue_list);
661 spin_unlock_bh(&conn->response_queue_lock);
666 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
668 struct iscsi_queue_req *qr, *qr_tmp;
670 spin_lock_bh(&conn->immed_queue_lock);
671 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
672 list_del(&qr->qr_list);
674 atomic_dec(&qr->cmd->immed_queue_count);
676 kmem_cache_free(lio_qr_cache, qr);
678 spin_unlock_bh(&conn->immed_queue_lock);
680 spin_lock_bh(&conn->response_queue_lock);
681 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
683 list_del(&qr->qr_list);
685 atomic_dec(&qr->cmd->response_queue_count);
687 kmem_cache_free(lio_qr_cache, qr);
689 spin_unlock_bh(&conn->response_queue_lock);
692 void iscsit_release_cmd(struct iscsi_cmd *cmd)
694 struct iscsi_session *sess;
695 struct se_cmd *se_cmd = &cmd->se_cmd;
698 sess = cmd->conn->sess;
702 BUG_ON(!sess || !sess->se_sess);
705 kfree(cmd->pdu_list);
706 kfree(cmd->seq_list);
708 kfree(cmd->iov_data);
709 kfree(cmd->text_in_ptr);
711 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
713 EXPORT_SYMBOL(iscsit_release_cmd);
715 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
717 struct iscsi_conn *conn = cmd->conn;
719 if (cmd->data_direction == DMA_TO_DEVICE) {
720 iscsit_stop_dataout_timer(cmd);
721 iscsit_free_r2ts_from_list(cmd);
723 if (cmd->data_direction == DMA_FROM_DEVICE)
724 iscsit_free_all_datain_reqs(cmd);
726 if (conn && check_queues) {
727 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
728 iscsit_remove_cmd_from_response_queue(cmd, conn);
731 if (conn && conn->conn_transport->iscsit_release_cmd)
732 conn->conn_transport->iscsit_release_cmd(conn, cmd);
735 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
737 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
740 __iscsit_free_cmd(cmd, shutdown);
742 rc = transport_generic_free_cmd(se_cmd, shutdown);
743 if (!rc && shutdown && se_cmd->se_sess) {
744 __iscsit_free_cmd(cmd, shutdown);
745 target_put_sess_cmd(se_cmd);
748 iscsit_release_cmd(cmd);
751 EXPORT_SYMBOL(iscsit_free_cmd);
753 int iscsit_check_session_usage_count(struct iscsi_session *sess)
755 spin_lock_bh(&sess->session_usage_lock);
756 if (sess->session_usage_count != 0) {
757 sess->session_waiting_on_uc = 1;
758 spin_unlock_bh(&sess->session_usage_lock);
762 wait_for_completion(&sess->session_waiting_on_uc_comp);
765 spin_unlock_bh(&sess->session_usage_lock);
770 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
772 spin_lock_bh(&sess->session_usage_lock);
773 sess->session_usage_count--;
775 if (!sess->session_usage_count && sess->session_waiting_on_uc)
776 complete(&sess->session_waiting_on_uc_comp);
778 spin_unlock_bh(&sess->session_usage_lock);
781 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
783 spin_lock_bh(&sess->session_usage_lock);
784 sess->session_usage_count++;
785 spin_unlock_bh(&sess->session_usage_lock);
788 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
790 struct iscsi_conn *conn;
792 spin_lock_bh(&sess->conn_lock);
793 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
794 if ((conn->cid == cid) &&
795 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
796 iscsit_inc_conn_usage_count(conn);
797 spin_unlock_bh(&sess->conn_lock);
801 spin_unlock_bh(&sess->conn_lock);
806 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
808 struct iscsi_conn *conn;
810 spin_lock_bh(&sess->conn_lock);
811 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
812 if (conn->cid == cid) {
813 iscsit_inc_conn_usage_count(conn);
814 spin_lock(&conn->state_lock);
815 atomic_set(&conn->connection_wait_rcfr, 1);
816 spin_unlock(&conn->state_lock);
817 spin_unlock_bh(&sess->conn_lock);
821 spin_unlock_bh(&sess->conn_lock);
826 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
828 spin_lock_bh(&conn->conn_usage_lock);
829 if (conn->conn_usage_count != 0) {
830 conn->conn_waiting_on_uc = 1;
831 spin_unlock_bh(&conn->conn_usage_lock);
833 wait_for_completion(&conn->conn_waiting_on_uc_comp);
836 spin_unlock_bh(&conn->conn_usage_lock);
839 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
841 spin_lock_bh(&conn->conn_usage_lock);
842 conn->conn_usage_count--;
844 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
845 complete(&conn->conn_waiting_on_uc_comp);
847 spin_unlock_bh(&conn->conn_usage_lock);
850 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
852 spin_lock_bh(&conn->conn_usage_lock);
853 conn->conn_usage_count++;
854 spin_unlock_bh(&conn->conn_usage_lock);
857 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
860 struct iscsi_cmd *cmd;
862 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
866 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
867 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
868 ISTATE_SEND_NOPIN_NO_RESPONSE;
869 cmd->init_task_tag = RESERVED_ITT;
870 cmd->targ_xfer_tag = (want_response) ?
871 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
872 spin_lock_bh(&conn->cmd_lock);
873 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
874 spin_unlock_bh(&conn->cmd_lock);
877 iscsit_start_nopin_response_timer(conn);
878 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
883 static void iscsit_handle_nopin_response_timeout(unsigned long data)
885 struct iscsi_conn *conn = (struct iscsi_conn *) data;
887 iscsit_inc_conn_usage_count(conn);
889 spin_lock_bh(&conn->nopin_timer_lock);
890 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
891 spin_unlock_bh(&conn->nopin_timer_lock);
892 iscsit_dec_conn_usage_count(conn);
896 pr_debug("Did not receive response to NOPIN on CID: %hu on"
897 " SID: %u, failing connection.\n", conn->cid,
899 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
900 spin_unlock_bh(&conn->nopin_timer_lock);
903 struct iscsi_portal_group *tpg = conn->sess->tpg;
904 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
907 spin_lock_bh(&tiqn->sess_err_stats.lock);
908 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
909 conn->sess->sess_ops->InitiatorName);
910 tiqn->sess_err_stats.last_sess_failure_type =
911 ISCSI_SESS_ERR_CXN_TIMEOUT;
912 tiqn->sess_err_stats.cxn_timeout_errors++;
913 atomic_long_inc(&conn->sess->conn_timeout_errors);
914 spin_unlock_bh(&tiqn->sess_err_stats.lock);
918 iscsit_cause_connection_reinstatement(conn, 0);
919 iscsit_dec_conn_usage_count(conn);
922 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
924 struct iscsi_session *sess = conn->sess;
925 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
927 spin_lock_bh(&conn->nopin_timer_lock);
928 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
929 spin_unlock_bh(&conn->nopin_timer_lock);
933 mod_timer(&conn->nopin_response_timer,
934 (get_jiffies_64() + na->nopin_response_timeout * HZ));
935 spin_unlock_bh(&conn->nopin_timer_lock);
939 * Called with conn->nopin_timer_lock held.
941 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
943 struct iscsi_session *sess = conn->sess;
944 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
946 spin_lock_bh(&conn->nopin_timer_lock);
947 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
948 spin_unlock_bh(&conn->nopin_timer_lock);
952 init_timer(&conn->nopin_response_timer);
953 conn->nopin_response_timer.expires =
954 (get_jiffies_64() + na->nopin_response_timeout * HZ);
955 conn->nopin_response_timer.data = (unsigned long)conn;
956 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
957 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
958 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
959 add_timer(&conn->nopin_response_timer);
961 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
962 " seconds\n", conn->cid, na->nopin_response_timeout);
963 spin_unlock_bh(&conn->nopin_timer_lock);
966 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
968 spin_lock_bh(&conn->nopin_timer_lock);
969 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
970 spin_unlock_bh(&conn->nopin_timer_lock);
973 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
974 spin_unlock_bh(&conn->nopin_timer_lock);
976 del_timer_sync(&conn->nopin_response_timer);
978 spin_lock_bh(&conn->nopin_timer_lock);
979 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
980 spin_unlock_bh(&conn->nopin_timer_lock);
983 static void iscsit_handle_nopin_timeout(unsigned long data)
985 struct iscsi_conn *conn = (struct iscsi_conn *) data;
987 iscsit_inc_conn_usage_count(conn);
989 spin_lock_bh(&conn->nopin_timer_lock);
990 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
991 spin_unlock_bh(&conn->nopin_timer_lock);
992 iscsit_dec_conn_usage_count(conn);
995 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
996 spin_unlock_bh(&conn->nopin_timer_lock);
998 iscsit_add_nopin(conn, 1);
999 iscsit_dec_conn_usage_count(conn);
1003 * Called with conn->nopin_timer_lock held.
1005 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1007 struct iscsi_session *sess = conn->sess;
1008 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1010 * NOPIN timeout is disabled.
1012 if (!na->nopin_timeout)
1015 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1018 init_timer(&conn->nopin_timer);
1019 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1020 conn->nopin_timer.data = (unsigned long)conn;
1021 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1022 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1023 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1024 add_timer(&conn->nopin_timer);
1026 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1027 " interval\n", conn->cid, na->nopin_timeout);
1030 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1032 struct iscsi_session *sess = conn->sess;
1033 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1035 * NOPIN timeout is disabled..
1037 if (!na->nopin_timeout)
1040 spin_lock_bh(&conn->nopin_timer_lock);
1041 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1046 init_timer(&conn->nopin_timer);
1047 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1048 conn->nopin_timer.data = (unsigned long)conn;
1049 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1050 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1051 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1052 add_timer(&conn->nopin_timer);
1054 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1055 " interval\n", conn->cid, na->nopin_timeout);
1056 spin_unlock_bh(&conn->nopin_timer_lock);
1059 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1061 spin_lock_bh(&conn->nopin_timer_lock);
1062 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1063 spin_unlock_bh(&conn->nopin_timer_lock);
1066 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1067 spin_unlock_bh(&conn->nopin_timer_lock);
1069 del_timer_sync(&conn->nopin_timer);
1071 spin_lock_bh(&conn->nopin_timer_lock);
1072 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1073 spin_unlock_bh(&conn->nopin_timer_lock);
1076 int iscsit_send_tx_data(
1077 struct iscsi_cmd *cmd,
1078 struct iscsi_conn *conn,
1081 int tx_sent, tx_size;
1086 tx_size = cmd->tx_size;
1089 iov = &cmd->iov_data[0];
1090 iov_count = cmd->iov_data_count;
1092 iov = &cmd->iov_misc[0];
1093 iov_count = cmd->iov_misc_count;
1096 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1097 if (tx_size != tx_sent) {
1098 if (tx_sent == -EAGAIN) {
1099 pr_err("tx_data() returned -EAGAIN\n");
1109 int iscsit_fe_sendpage_sg(
1110 struct iscsi_cmd *cmd,
1111 struct iscsi_conn *conn)
1113 struct scatterlist *sg = cmd->first_data_sg;
1115 u32 tx_hdr_size, data_len;
1116 u32 offset = cmd->first_data_sg_off;
1117 int tx_sent, iov_off;
1120 tx_hdr_size = ISCSI_HDR_LEN;
1121 if (conn->conn_ops->HeaderDigest)
1122 tx_hdr_size += ISCSI_CRC_LEN;
1124 iov.iov_base = cmd->pdu;
1125 iov.iov_len = tx_hdr_size;
1127 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1128 if (tx_hdr_size != tx_sent) {
1129 if (tx_sent == -EAGAIN) {
1130 pr_err("tx_data() returned -EAGAIN\n");
1136 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1138 * Set iov_off used by padding and data digest tx_data() calls below
1139 * in order to determine proper offset into cmd->iov_data[]
1141 if (conn->conn_ops->DataDigest) {
1142 data_len -= ISCSI_CRC_LEN;
1144 iov_off = (cmd->iov_data_count - 2);
1146 iov_off = (cmd->iov_data_count - 1);
1148 iov_off = (cmd->iov_data_count - 1);
1151 * Perform sendpage() for each page in the scatterlist
1154 u32 space = (sg->length - offset);
1155 u32 sub_len = min_t(u32, data_len, space);
1157 tx_sent = conn->sock->ops->sendpage(conn->sock,
1158 sg_page(sg), sg->offset + offset, sub_len, 0);
1159 if (tx_sent != sub_len) {
1160 if (tx_sent == -EAGAIN) {
1161 pr_err("tcp_sendpage() returned"
1166 pr_err("tcp_sendpage() failure: %d\n",
1171 data_len -= sub_len;
1178 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1180 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1181 if (cmd->padding != tx_sent) {
1182 if (tx_sent == -EAGAIN) {
1183 pr_err("tx_data() returned -EAGAIN\n");
1191 if (conn->conn_ops->DataDigest) {
1192 struct kvec *iov_d = &cmd->iov_data[iov_off];
1194 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1195 if (ISCSI_CRC_LEN != tx_sent) {
1196 if (tx_sent == -EAGAIN) {
1197 pr_err("tx_data() returned -EAGAIN\n");
1208 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1209 * back to the Initiator when an expection condition occurs with the
1210 * errors set in status_class and status_detail.
1212 * Parameters: iSCSI Connection, Status Class, Status Detail.
1213 * Returns: 0 on success, -1 on error.
1215 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1217 struct iscsi_login_rsp *hdr;
1218 struct iscsi_login *login = conn->conn_login;
1220 login->login_failed = 1;
1221 iscsit_collect_login_stats(conn, status_class, status_detail);
1223 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1225 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1226 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1227 hdr->status_class = status_class;
1228 hdr->status_detail = status_detail;
1229 hdr->itt = conn->login_itt;
1231 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1234 void iscsit_print_session_params(struct iscsi_session *sess)
1236 struct iscsi_conn *conn;
1238 pr_debug("-----------------------------[Session Params for"
1239 " SID: %u]-----------------------------\n", sess->sid);
1240 spin_lock_bh(&sess->conn_lock);
1241 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1242 iscsi_dump_conn_ops(conn->conn_ops);
1243 spin_unlock_bh(&sess->conn_lock);
1245 iscsi_dump_sess_ops(sess->sess_ops);
1248 static int iscsit_do_rx_data(
1249 struct iscsi_conn *conn,
1250 struct iscsi_data_count *count)
1252 int data = count->data_length, rx_loop = 0, total_rx = 0;
1255 if (!conn || !conn->sock || !conn->conn_ops)
1258 memset(&msg, 0, sizeof(struct msghdr));
1259 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1260 count->iov, count->iov_count, data);
1262 while (msg_data_left(&msg)) {
1263 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1265 pr_debug("rx_loop: %d total_rx: %d\n",
1269 total_rx += rx_loop;
1270 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1271 rx_loop, total_rx, data);
1278 struct iscsi_conn *conn,
1283 struct iscsi_data_count c;
1285 if (!conn || !conn->sock || !conn->conn_ops)
1288 memset(&c, 0, sizeof(struct iscsi_data_count));
1290 c.iov_count = iov_count;
1291 c.data_length = data;
1292 c.type = ISCSI_RX_DATA;
1294 return iscsit_do_rx_data(conn, &c);
1298 struct iscsi_conn *conn,
1306 if (!conn || !conn->sock || !conn->conn_ops)
1310 pr_err("Data length is: %d\n", data);
1314 memset(&msg, 0, sizeof(struct msghdr));
1316 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
1317 iov, iov_count, data);
1319 while (msg_data_left(&msg)) {
1320 int tx_loop = sock_sendmsg(conn->sock, &msg);
1322 pr_debug("tx_loop: %d total_tx %d\n",
1326 total_tx += tx_loop;
1327 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1328 tx_loop, total_tx, data);
1334 void iscsit_collect_login_stats(
1335 struct iscsi_conn *conn,
1339 struct iscsi_param *intrname = NULL;
1340 struct iscsi_tiqn *tiqn;
1341 struct iscsi_login_stats *ls;
1343 tiqn = iscsit_snmp_get_tiqn(conn);
1347 ls = &tiqn->login_stats;
1349 spin_lock(&ls->lock);
1350 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1352 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1354 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1355 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1356 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1357 ls->authenticate_fails++;
1358 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1359 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1360 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1361 ls->authorize_fails++;
1362 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1363 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1364 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1365 ls->negotiate_fails++;
1366 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1369 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1372 /* Save initiator name, ip address and time, if it is a failed login */
1373 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1374 if (conn->param_list)
1375 intrname = iscsi_find_param_from_key(INITIATORNAME,
1377 strlcpy(ls->last_intr_fail_name,
1378 (intrname ? intrname->value : "Unknown"),
1379 sizeof(ls->last_intr_fail_name));
1381 ls->last_intr_fail_ip_family = conn->login_family;
1383 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1384 ls->last_fail_time = get_jiffies_64();
1387 spin_unlock(&ls->lock);
1390 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1392 struct iscsi_portal_group *tpg;
1404 return tpg->tpg_tiqn;