1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/list.h>
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/target_core_configfs.h>
27 #include <target/iscsi/iscsi_transport.h>
29 #include "iscsi_target_core.h"
30 #include "iscsi_target_parameters.h"
31 #include "iscsi_target_seq_pdu_list.h"
32 #include "iscsi_target_datain_values.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target_tpg.h"
37 #include "iscsi_target_tq.h"
38 #include "iscsi_target_util.h"
39 #include "iscsi_target.h"
41 #define PRINT_BUFF(buff, len) \
45 pr_debug("%d:\n", __LINE__); \
46 for (zzz = 0; zzz < len; zzz++) { \
47 if (zzz % 16 == 0) { \
50 pr_debug("%4i: ", zzz); \
52 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
58 extern struct list_head g_tiqn_list;
59 extern spinlock_t tiqn_lock;
62 * Called with cmd->r2t_lock held.
64 int iscsit_add_r2t_to_list(
65 struct iscsi_cmd *cmd,
71 struct iscsi_r2t *r2t;
73 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
75 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
78 INIT_LIST_HEAD(&r2t->r2t_list);
80 r2t->recovery_r2t = recovery;
81 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
83 r2t->xfer_len = xfer_len;
84 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
85 spin_unlock_bh(&cmd->r2t_lock);
87 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
89 spin_lock_bh(&cmd->r2t_lock);
93 struct iscsi_r2t *iscsit_get_r2t_for_eos(
94 struct iscsi_cmd *cmd,
98 struct iscsi_r2t *r2t;
100 spin_lock_bh(&cmd->r2t_lock);
101 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
102 if ((r2t->offset <= offset) &&
103 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
104 spin_unlock_bh(&cmd->r2t_lock);
108 spin_unlock_bh(&cmd->r2t_lock);
110 pr_err("Unable to locate R2T for Offset: %u, Length:"
111 " %u\n", offset, length);
115 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
117 struct iscsi_r2t *r2t;
119 spin_lock_bh(&cmd->r2t_lock);
120 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
121 if (!r2t->sent_r2t) {
122 spin_unlock_bh(&cmd->r2t_lock);
126 spin_unlock_bh(&cmd->r2t_lock);
128 pr_err("Unable to locate next R2T to send for ITT:"
129 " 0x%08x.\n", cmd->init_task_tag);
134 * Called with cmd->r2t_lock held.
136 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
138 list_del(&r2t->r2t_list);
139 kmem_cache_free(lio_r2t_cache, r2t);
142 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
144 struct iscsi_r2t *r2t, *r2t_tmp;
146 spin_lock_bh(&cmd->r2t_lock);
147 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
148 iscsit_free_r2t(r2t, cmd);
149 spin_unlock_bh(&cmd->r2t_lock);
152 struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
154 struct iscsi_cmd *cmd;
156 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
160 cmd->release_cmd = &iscsit_release_cmd;
165 * May be called from software interrupt (timer) context for allocating
168 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
170 struct iscsi_cmd *cmd;
172 cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask);
174 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
178 INIT_LIST_HEAD(&cmd->i_conn_node);
179 INIT_LIST_HEAD(&cmd->datain_list);
180 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
181 init_completion(&cmd->reject_comp);
182 spin_lock_init(&cmd->datain_lock);
183 spin_lock_init(&cmd->dataout_timeout_lock);
184 spin_lock_init(&cmd->istate_lock);
185 spin_lock_init(&cmd->error_lock);
186 spin_lock_init(&cmd->r2t_lock);
190 EXPORT_SYMBOL(iscsit_allocate_cmd);
192 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
193 struct iscsi_cmd *cmd,
198 for (i = 0; i < cmd->seq_count; i++)
199 if (cmd->seq_list[i].seq_send_order == seq_send_order)
200 return &cmd->seq_list[i];
205 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
209 if (!cmd->seq_list) {
210 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
214 for (i = 0; i < cmd->seq_count; i++) {
215 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
217 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
218 cmd->seq_send_order++;
219 return &cmd->seq_list[i];
226 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
227 struct iscsi_cmd *cmd,
230 struct iscsi_r2t *r2t;
232 spin_lock_bh(&cmd->r2t_lock);
233 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
234 if (r2t->r2t_sn == r2t_sn) {
235 spin_unlock_bh(&cmd->r2t_lock);
239 spin_unlock_bh(&cmd->r2t_lock);
244 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
249 * This is the proper method of checking received CmdSN against
250 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
251 * or order CmdSNs due to multiple connection sessions and/or
254 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
255 pr_err("Received CmdSN: 0x%08x is greater than"
256 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
258 ret = CMDSN_ERROR_CANNOT_RECOVER;
260 } else if (cmdsn == sess->exp_cmd_sn) {
262 pr_debug("Received CmdSN matches ExpCmdSN,"
263 " incremented ExpCmdSN to: 0x%08x\n",
265 ret = CMDSN_NORMAL_OPERATION;
267 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
268 pr_debug("Received CmdSN: 0x%08x is greater"
269 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
270 cmdsn, sess->exp_cmd_sn);
271 ret = CMDSN_HIGHER_THAN_EXP;
274 pr_err("Received CmdSN: 0x%08x is less than"
275 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
277 ret = CMDSN_LOWER_THAN_EXP;
284 * Commands may be received out of order if MC/S is in use.
285 * Ensure they are executed in CmdSN order.
287 int iscsit_sequence_cmd(
288 struct iscsi_conn *conn,
289 struct iscsi_cmd *cmd,
295 mutex_lock(&conn->sess->cmdsn_mutex);
297 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
299 case CMDSN_NORMAL_OPERATION:
300 ret = iscsit_execute_cmd(cmd, 0);
301 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
302 iscsit_execute_ooo_cmdsns(conn->sess);
304 case CMDSN_HIGHER_THAN_EXP:
305 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
307 case CMDSN_LOWER_THAN_EXP:
308 cmd->i_state = ISTATE_REMOVE;
309 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
316 mutex_unlock(&conn->sess->cmdsn_mutex);
320 EXPORT_SYMBOL(iscsit_sequence_cmd);
322 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
324 struct iscsi_conn *conn = cmd->conn;
325 struct se_cmd *se_cmd = &cmd->se_cmd;
326 struct iscsi_data *hdr = (struct iscsi_data *) buf;
327 u32 payload_length = ntoh24(hdr->dlength);
329 if (conn->sess->sess_ops->InitialR2T) {
330 pr_err("Received unexpected unsolicited data"
331 " while InitialR2T=Yes, protocol error.\n");
332 transport_send_check_condition_and_sense(se_cmd,
333 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
337 if ((cmd->first_burst_len + payload_length) >
338 conn->sess->sess_ops->FirstBurstLength) {
339 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
340 " for this Unsolicited DataOut Burst.\n",
341 (cmd->first_burst_len + payload_length),
342 conn->sess->sess_ops->FirstBurstLength);
343 transport_send_check_condition_and_sense(se_cmd,
344 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
348 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
351 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
352 ((cmd->first_burst_len + payload_length) !=
353 conn->sess->sess_ops->FirstBurstLength)) {
354 pr_err("Unsolicited non-immediate data received %u"
355 " does not equal FirstBurstLength: %u, and does"
356 " not equal ExpXferLen %u.\n",
357 (cmd->first_burst_len + payload_length),
358 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
359 transport_send_check_condition_and_sense(se_cmd,
360 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
366 struct iscsi_cmd *iscsit_find_cmd_from_itt(
367 struct iscsi_conn *conn,
370 struct iscsi_cmd *cmd;
372 spin_lock_bh(&conn->cmd_lock);
373 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
374 if (cmd->init_task_tag == init_task_tag) {
375 spin_unlock_bh(&conn->cmd_lock);
379 spin_unlock_bh(&conn->cmd_lock);
381 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
382 init_task_tag, conn->cid);
386 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
387 struct iscsi_conn *conn,
391 struct iscsi_cmd *cmd;
393 spin_lock_bh(&conn->cmd_lock);
394 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
395 if (cmd->init_task_tag == init_task_tag) {
396 spin_unlock_bh(&conn->cmd_lock);
400 spin_unlock_bh(&conn->cmd_lock);
402 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
403 " dumping payload\n", init_task_tag, conn->cid);
405 iscsit_dump_data_payload(conn, length, 1);
410 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
411 struct iscsi_conn *conn,
414 struct iscsi_cmd *cmd = NULL;
416 spin_lock_bh(&conn->cmd_lock);
417 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
418 if (cmd->targ_xfer_tag == targ_xfer_tag) {
419 spin_unlock_bh(&conn->cmd_lock);
423 spin_unlock_bh(&conn->cmd_lock);
425 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
426 targ_xfer_tag, conn->cid);
430 int iscsit_find_cmd_for_recovery(
431 struct iscsi_session *sess,
432 struct iscsi_cmd **cmd_ptr,
433 struct iscsi_conn_recovery **cr_ptr,
436 struct iscsi_cmd *cmd = NULL;
437 struct iscsi_conn_recovery *cr;
439 * Scan through the inactive connection recovery list's command list.
440 * If init_task_tag matches the command is still alligent.
442 spin_lock(&sess->cr_i_lock);
443 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
444 spin_lock(&cr->conn_recovery_cmd_lock);
445 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
446 if (cmd->init_task_tag == init_task_tag) {
447 spin_unlock(&cr->conn_recovery_cmd_lock);
448 spin_unlock(&sess->cr_i_lock);
455 spin_unlock(&cr->conn_recovery_cmd_lock);
457 spin_unlock(&sess->cr_i_lock);
459 * Scan through the active connection recovery list's command list.
460 * If init_task_tag matches the command is ready to be reassigned.
462 spin_lock(&sess->cr_a_lock);
463 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
464 spin_lock(&cr->conn_recovery_cmd_lock);
465 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
466 if (cmd->init_task_tag == init_task_tag) {
467 spin_unlock(&cr->conn_recovery_cmd_lock);
468 spin_unlock(&sess->cr_a_lock);
475 spin_unlock(&cr->conn_recovery_cmd_lock);
477 spin_unlock(&sess->cr_a_lock);
482 void iscsit_add_cmd_to_immediate_queue(
483 struct iscsi_cmd *cmd,
484 struct iscsi_conn *conn,
487 struct iscsi_queue_req *qr;
489 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
491 pr_err("Unable to allocate memory for"
492 " struct iscsi_queue_req\n");
495 INIT_LIST_HEAD(&qr->qr_list);
499 spin_lock_bh(&conn->immed_queue_lock);
500 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
501 atomic_inc(&cmd->immed_queue_count);
502 atomic_set(&conn->check_immediate_queue, 1);
503 spin_unlock_bh(&conn->immed_queue_lock);
505 wake_up(&conn->queues_wq);
508 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
510 struct iscsi_queue_req *qr;
512 spin_lock_bh(&conn->immed_queue_lock);
513 if (list_empty(&conn->immed_queue_list)) {
514 spin_unlock_bh(&conn->immed_queue_lock);
517 qr = list_first_entry(&conn->immed_queue_list,
518 struct iscsi_queue_req, qr_list);
520 list_del(&qr->qr_list);
522 atomic_dec(&qr->cmd->immed_queue_count);
523 spin_unlock_bh(&conn->immed_queue_lock);
528 static void iscsit_remove_cmd_from_immediate_queue(
529 struct iscsi_cmd *cmd,
530 struct iscsi_conn *conn)
532 struct iscsi_queue_req *qr, *qr_tmp;
534 spin_lock_bh(&conn->immed_queue_lock);
535 if (!atomic_read(&cmd->immed_queue_count)) {
536 spin_unlock_bh(&conn->immed_queue_lock);
540 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
544 atomic_dec(&qr->cmd->immed_queue_count);
545 list_del(&qr->qr_list);
546 kmem_cache_free(lio_qr_cache, qr);
548 spin_unlock_bh(&conn->immed_queue_lock);
550 if (atomic_read(&cmd->immed_queue_count)) {
551 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
553 atomic_read(&cmd->immed_queue_count));
557 void iscsit_add_cmd_to_response_queue(
558 struct iscsi_cmd *cmd,
559 struct iscsi_conn *conn,
562 struct iscsi_queue_req *qr;
564 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
566 pr_err("Unable to allocate memory for"
567 " struct iscsi_queue_req\n");
570 INIT_LIST_HEAD(&qr->qr_list);
574 spin_lock_bh(&conn->response_queue_lock);
575 list_add_tail(&qr->qr_list, &conn->response_queue_list);
576 atomic_inc(&cmd->response_queue_count);
577 spin_unlock_bh(&conn->response_queue_lock);
579 wake_up(&conn->queues_wq);
582 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
584 struct iscsi_queue_req *qr;
586 spin_lock_bh(&conn->response_queue_lock);
587 if (list_empty(&conn->response_queue_list)) {
588 spin_unlock_bh(&conn->response_queue_lock);
592 qr = list_first_entry(&conn->response_queue_list,
593 struct iscsi_queue_req, qr_list);
595 list_del(&qr->qr_list);
597 atomic_dec(&qr->cmd->response_queue_count);
598 spin_unlock_bh(&conn->response_queue_lock);
603 static void iscsit_remove_cmd_from_response_queue(
604 struct iscsi_cmd *cmd,
605 struct iscsi_conn *conn)
607 struct iscsi_queue_req *qr, *qr_tmp;
609 spin_lock_bh(&conn->response_queue_lock);
610 if (!atomic_read(&cmd->response_queue_count)) {
611 spin_unlock_bh(&conn->response_queue_lock);
615 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
620 atomic_dec(&qr->cmd->response_queue_count);
621 list_del(&qr->qr_list);
622 kmem_cache_free(lio_qr_cache, qr);
624 spin_unlock_bh(&conn->response_queue_lock);
626 if (atomic_read(&cmd->response_queue_count)) {
627 pr_err("ITT: 0x%08x response_queue_count: %d\n",
629 atomic_read(&cmd->response_queue_count));
633 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
637 spin_lock_bh(&conn->immed_queue_lock);
638 empty = list_empty(&conn->immed_queue_list);
639 spin_unlock_bh(&conn->immed_queue_lock);
644 spin_lock_bh(&conn->response_queue_lock);
645 empty = list_empty(&conn->response_queue_list);
646 spin_unlock_bh(&conn->response_queue_lock);
651 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
653 struct iscsi_queue_req *qr, *qr_tmp;
655 spin_lock_bh(&conn->immed_queue_lock);
656 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
657 list_del(&qr->qr_list);
659 atomic_dec(&qr->cmd->immed_queue_count);
661 kmem_cache_free(lio_qr_cache, qr);
663 spin_unlock_bh(&conn->immed_queue_lock);
665 spin_lock_bh(&conn->response_queue_lock);
666 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
668 list_del(&qr->qr_list);
670 atomic_dec(&qr->cmd->response_queue_count);
672 kmem_cache_free(lio_qr_cache, qr);
674 spin_unlock_bh(&conn->response_queue_lock);
677 void iscsit_release_cmd(struct iscsi_cmd *cmd)
680 kfree(cmd->pdu_list);
681 kfree(cmd->seq_list);
683 kfree(cmd->iov_data);
685 kmem_cache_free(lio_cmd_cache, cmd);
688 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
691 struct iscsi_conn *conn = cmd->conn;
694 if (cmd->data_direction == DMA_TO_DEVICE) {
695 iscsit_stop_dataout_timer(cmd);
696 iscsit_free_r2ts_from_list(cmd);
698 if (cmd->data_direction == DMA_FROM_DEVICE)
699 iscsit_free_all_datain_reqs(cmd);
702 if (conn && check_queues) {
703 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
704 iscsit_remove_cmd_from_response_queue(cmd, conn);
708 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
710 struct se_cmd *se_cmd = NULL;
713 * Determine if a struct se_cmd is associated with
714 * this struct iscsi_cmd.
716 switch (cmd->iscsi_opcode) {
717 case ISCSI_OP_SCSI_CMD:
718 se_cmd = &cmd->se_cmd;
719 __iscsit_free_cmd(cmd, true, shutdown);
723 case ISCSI_OP_SCSI_TMFUNC:
724 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
725 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
726 __iscsit_free_cmd(cmd, true, shutdown);
727 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
730 case ISCSI_OP_REJECT:
732 * Handle special case for REJECT when iscsi_add_reject*() has
733 * overwritten the original iscsi_opcode assignment, and the
734 * associated cmd->se_cmd needs to be released.
736 if (cmd->se_cmd.se_tfo != NULL) {
737 se_cmd = &cmd->se_cmd;
738 __iscsit_free_cmd(cmd, true, shutdown);
740 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
741 if (!rc && shutdown && se_cmd->se_sess) {
742 __iscsit_free_cmd(cmd, true, shutdown);
743 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
749 __iscsit_free_cmd(cmd, false, shutdown);
750 cmd->release_cmd(cmd);
755 int iscsit_check_session_usage_count(struct iscsi_session *sess)
757 spin_lock_bh(&sess->session_usage_lock);
758 if (sess->session_usage_count != 0) {
759 sess->session_waiting_on_uc = 1;
760 spin_unlock_bh(&sess->session_usage_lock);
764 wait_for_completion(&sess->session_waiting_on_uc_comp);
767 spin_unlock_bh(&sess->session_usage_lock);
772 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
774 spin_lock_bh(&sess->session_usage_lock);
775 sess->session_usage_count--;
777 if (!sess->session_usage_count && sess->session_waiting_on_uc)
778 complete(&sess->session_waiting_on_uc_comp);
780 spin_unlock_bh(&sess->session_usage_lock);
783 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
785 spin_lock_bh(&sess->session_usage_lock);
786 sess->session_usage_count++;
787 spin_unlock_bh(&sess->session_usage_lock);
791 * Setup conn->if_marker and conn->of_marker values based upon
792 * the initial marker-less interval. (see iSCSI v19 A.2)
794 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
796 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
798 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
800 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
801 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
803 if (conn->conn_ops->OFMarker) {
805 * Account for the first Login Command received not
806 * via iscsi_recv_msg().
808 conn->of_marker += ISCSI_HDR_LEN;
809 if (conn->of_marker <= OFMarkInt) {
810 conn->of_marker = (OFMarkInt - conn->of_marker);
812 login_ofmarker_count = (conn->of_marker / OFMarkInt);
813 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
814 (login_ofmarker_count * MARKER_SIZE);
815 conn->of_marker = (next_marker - conn->of_marker);
817 conn->of_marker_offset = 0;
818 pr_debug("Setting OFMarker value to %u based on Initial"
819 " Markerless Interval.\n", conn->of_marker);
822 if (conn->conn_ops->IFMarker) {
823 if (conn->if_marker <= IFMarkInt) {
824 conn->if_marker = (IFMarkInt - conn->if_marker);
826 login_ifmarker_count = (conn->if_marker / IFMarkInt);
827 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
828 (login_ifmarker_count * MARKER_SIZE);
829 conn->if_marker = (next_marker - conn->if_marker);
831 pr_debug("Setting IFMarker value to %u based on Initial"
832 " Markerless Interval.\n", conn->if_marker);
838 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
840 struct iscsi_conn *conn;
842 spin_lock_bh(&sess->conn_lock);
843 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
844 if ((conn->cid == cid) &&
845 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
846 iscsit_inc_conn_usage_count(conn);
847 spin_unlock_bh(&sess->conn_lock);
851 spin_unlock_bh(&sess->conn_lock);
856 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
858 struct iscsi_conn *conn;
860 spin_lock_bh(&sess->conn_lock);
861 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
862 if (conn->cid == cid) {
863 iscsit_inc_conn_usage_count(conn);
864 spin_lock(&conn->state_lock);
865 atomic_set(&conn->connection_wait_rcfr, 1);
866 spin_unlock(&conn->state_lock);
867 spin_unlock_bh(&sess->conn_lock);
871 spin_unlock_bh(&sess->conn_lock);
876 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
878 spin_lock_bh(&conn->conn_usage_lock);
879 if (conn->conn_usage_count != 0) {
880 conn->conn_waiting_on_uc = 1;
881 spin_unlock_bh(&conn->conn_usage_lock);
883 wait_for_completion(&conn->conn_waiting_on_uc_comp);
886 spin_unlock_bh(&conn->conn_usage_lock);
889 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
891 spin_lock_bh(&conn->conn_usage_lock);
892 conn->conn_usage_count--;
894 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
895 complete(&conn->conn_waiting_on_uc_comp);
897 spin_unlock_bh(&conn->conn_usage_lock);
900 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
902 spin_lock_bh(&conn->conn_usage_lock);
903 conn->conn_usage_count++;
904 spin_unlock_bh(&conn->conn_usage_lock);
907 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
910 struct iscsi_cmd *cmd;
912 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
916 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
917 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
918 ISTATE_SEND_NOPIN_NO_RESPONSE;
919 cmd->init_task_tag = RESERVED_ITT;
920 spin_lock_bh(&conn->sess->ttt_lock);
921 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
923 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
924 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
925 spin_unlock_bh(&conn->sess->ttt_lock);
927 spin_lock_bh(&conn->cmd_lock);
928 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
929 spin_unlock_bh(&conn->cmd_lock);
932 iscsit_start_nopin_response_timer(conn);
933 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
938 static void iscsit_handle_nopin_response_timeout(unsigned long data)
940 struct iscsi_conn *conn = (struct iscsi_conn *) data;
942 iscsit_inc_conn_usage_count(conn);
944 spin_lock_bh(&conn->nopin_timer_lock);
945 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
946 spin_unlock_bh(&conn->nopin_timer_lock);
947 iscsit_dec_conn_usage_count(conn);
951 pr_debug("Did not receive response to NOPIN on CID: %hu on"
952 " SID: %u, failing connection.\n", conn->cid,
954 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
955 spin_unlock_bh(&conn->nopin_timer_lock);
958 struct iscsi_portal_group *tpg = conn->sess->tpg;
959 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
962 spin_lock_bh(&tiqn->sess_err_stats.lock);
963 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
964 conn->sess->sess_ops->InitiatorName);
965 tiqn->sess_err_stats.last_sess_failure_type =
966 ISCSI_SESS_ERR_CXN_TIMEOUT;
967 tiqn->sess_err_stats.cxn_timeout_errors++;
968 conn->sess->conn_timeout_errors++;
969 spin_unlock_bh(&tiqn->sess_err_stats.lock);
973 iscsit_cause_connection_reinstatement(conn, 0);
974 iscsit_dec_conn_usage_count(conn);
977 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
979 struct iscsi_session *sess = conn->sess;
980 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
982 spin_lock_bh(&conn->nopin_timer_lock);
983 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
984 spin_unlock_bh(&conn->nopin_timer_lock);
988 mod_timer(&conn->nopin_response_timer,
989 (get_jiffies_64() + na->nopin_response_timeout * HZ));
990 spin_unlock_bh(&conn->nopin_timer_lock);
994 * Called with conn->nopin_timer_lock held.
996 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
998 struct iscsi_session *sess = conn->sess;
999 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1001 spin_lock_bh(&conn->nopin_timer_lock);
1002 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1007 init_timer(&conn->nopin_response_timer);
1008 conn->nopin_response_timer.expires =
1009 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1010 conn->nopin_response_timer.data = (unsigned long)conn;
1011 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1012 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1013 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1014 add_timer(&conn->nopin_response_timer);
1016 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1017 " seconds\n", conn->cid, na->nopin_response_timeout);
1018 spin_unlock_bh(&conn->nopin_timer_lock);
1021 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1023 spin_lock_bh(&conn->nopin_timer_lock);
1024 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1025 spin_unlock_bh(&conn->nopin_timer_lock);
1028 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1029 spin_unlock_bh(&conn->nopin_timer_lock);
1031 del_timer_sync(&conn->nopin_response_timer);
1033 spin_lock_bh(&conn->nopin_timer_lock);
1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1035 spin_unlock_bh(&conn->nopin_timer_lock);
1038 static void iscsit_handle_nopin_timeout(unsigned long data)
1040 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1042 iscsit_inc_conn_usage_count(conn);
1044 spin_lock_bh(&conn->nopin_timer_lock);
1045 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1047 iscsit_dec_conn_usage_count(conn);
1050 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1051 spin_unlock_bh(&conn->nopin_timer_lock);
1053 iscsit_add_nopin(conn, 1);
1054 iscsit_dec_conn_usage_count(conn);
1058 * Called with conn->nopin_timer_lock held.
1060 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1062 struct iscsi_session *sess = conn->sess;
1063 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1065 * NOPIN timeout is disabled.
1067 if (!na->nopin_timeout)
1070 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1073 init_timer(&conn->nopin_timer);
1074 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1075 conn->nopin_timer.data = (unsigned long)conn;
1076 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1077 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1078 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1079 add_timer(&conn->nopin_timer);
1081 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1082 " interval\n", conn->cid, na->nopin_timeout);
1085 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1087 struct iscsi_session *sess = conn->sess;
1088 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1090 * NOPIN timeout is disabled..
1092 if (!na->nopin_timeout)
1095 spin_lock_bh(&conn->nopin_timer_lock);
1096 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1097 spin_unlock_bh(&conn->nopin_timer_lock);
1101 init_timer(&conn->nopin_timer);
1102 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1103 conn->nopin_timer.data = (unsigned long)conn;
1104 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1105 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1106 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1107 add_timer(&conn->nopin_timer);
1109 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1110 " interval\n", conn->cid, na->nopin_timeout);
1111 spin_unlock_bh(&conn->nopin_timer_lock);
1114 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1116 spin_lock_bh(&conn->nopin_timer_lock);
1117 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1118 spin_unlock_bh(&conn->nopin_timer_lock);
1121 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1122 spin_unlock_bh(&conn->nopin_timer_lock);
1124 del_timer_sync(&conn->nopin_timer);
1126 spin_lock_bh(&conn->nopin_timer_lock);
1127 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1128 spin_unlock_bh(&conn->nopin_timer_lock);
1131 int iscsit_send_tx_data(
1132 struct iscsi_cmd *cmd,
1133 struct iscsi_conn *conn,
1136 int tx_sent, tx_size;
1141 tx_size = cmd->tx_size;
1144 iov = &cmd->iov_data[0];
1145 iov_count = cmd->iov_data_count;
1147 iov = &cmd->iov_misc[0];
1148 iov_count = cmd->iov_misc_count;
1151 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1152 if (tx_size != tx_sent) {
1153 if (tx_sent == -EAGAIN) {
1154 pr_err("tx_data() returned -EAGAIN\n");
1164 int iscsit_fe_sendpage_sg(
1165 struct iscsi_cmd *cmd,
1166 struct iscsi_conn *conn)
1168 struct scatterlist *sg = cmd->first_data_sg;
1170 u32 tx_hdr_size, data_len;
1171 u32 offset = cmd->first_data_sg_off;
1172 int tx_sent, iov_off;
1175 tx_hdr_size = ISCSI_HDR_LEN;
1176 if (conn->conn_ops->HeaderDigest)
1177 tx_hdr_size += ISCSI_CRC_LEN;
1179 iov.iov_base = cmd->pdu;
1180 iov.iov_len = tx_hdr_size;
1182 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1183 if (tx_hdr_size != tx_sent) {
1184 if (tx_sent == -EAGAIN) {
1185 pr_err("tx_data() returned -EAGAIN\n");
1191 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1193 * Set iov_off used by padding and data digest tx_data() calls below
1194 * in order to determine proper offset into cmd->iov_data[]
1196 if (conn->conn_ops->DataDigest) {
1197 data_len -= ISCSI_CRC_LEN;
1199 iov_off = (cmd->iov_data_count - 2);
1201 iov_off = (cmd->iov_data_count - 1);
1203 iov_off = (cmd->iov_data_count - 1);
1206 * Perform sendpage() for each page in the scatterlist
1209 u32 space = (sg->length - offset);
1210 u32 sub_len = min_t(u32, data_len, space);
1212 tx_sent = conn->sock->ops->sendpage(conn->sock,
1213 sg_page(sg), sg->offset + offset, sub_len, 0);
1214 if (tx_sent != sub_len) {
1215 if (tx_sent == -EAGAIN) {
1216 pr_err("tcp_sendpage() returned"
1221 pr_err("tcp_sendpage() failure: %d\n",
1226 data_len -= sub_len;
1233 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1235 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1236 if (cmd->padding != tx_sent) {
1237 if (tx_sent == -EAGAIN) {
1238 pr_err("tx_data() returned -EAGAIN\n");
1246 if (conn->conn_ops->DataDigest) {
1247 struct kvec *iov_d = &cmd->iov_data[iov_off];
1249 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1250 if (ISCSI_CRC_LEN != tx_sent) {
1251 if (tx_sent == -EAGAIN) {
1252 pr_err("tx_data() returned -EAGAIN\n");
1263 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1264 * back to the Initiator when an expection condition occurs with the
1265 * errors set in status_class and status_detail.
1267 * Parameters: iSCSI Connection, Status Class, Status Detail.
1268 * Returns: 0 on success, -1 on error.
1270 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1272 struct iscsi_login_rsp *hdr;
1273 struct iscsi_login *login = conn->conn_login;
1275 login->login_failed = 1;
1276 iscsit_collect_login_stats(conn, status_class, status_detail);
1278 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1279 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1280 hdr->status_class = status_class;
1281 hdr->status_detail = status_detail;
1282 hdr->itt = conn->login_itt;
1284 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1287 void iscsit_print_session_params(struct iscsi_session *sess)
1289 struct iscsi_conn *conn;
1291 pr_debug("-----------------------------[Session Params for"
1292 " SID: %u]-----------------------------\n", sess->sid);
1293 spin_lock_bh(&sess->conn_lock);
1294 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1295 iscsi_dump_conn_ops(conn->conn_ops);
1296 spin_unlock_bh(&sess->conn_lock);
1298 iscsi_dump_sess_ops(sess->sess_ops);
1301 static int iscsit_do_rx_data(
1302 struct iscsi_conn *conn,
1303 struct iscsi_data_count *count)
1305 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1309 if (!conn || !conn->sock || !conn->conn_ops)
1312 memset(&msg, 0, sizeof(struct msghdr));
1315 iov_len = count->iov_count;
1317 while (total_rx < data) {
1318 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1319 (data - total_rx), MSG_WAITALL);
1321 pr_debug("rx_loop: %d total_rx: %d\n",
1325 total_rx += rx_loop;
1326 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1327 rx_loop, total_rx, data);
1333 static int iscsit_do_tx_data(
1334 struct iscsi_conn *conn,
1335 struct iscsi_data_count *count)
1337 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1341 if (!conn || !conn->sock || !conn->conn_ops)
1345 pr_err("Data length is: %d\n", data);
1349 memset(&msg, 0, sizeof(struct msghdr));
1352 iov_len = count->iov_count;
1354 while (total_tx < data) {
1355 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1358 pr_debug("tx_loop: %d total_tx %d\n",
1362 total_tx += tx_loop;
1363 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1364 tx_loop, total_tx, data);
1371 struct iscsi_conn *conn,
1376 struct iscsi_data_count c;
1378 if (!conn || !conn->sock || !conn->conn_ops)
1381 memset(&c, 0, sizeof(struct iscsi_data_count));
1383 c.iov_count = iov_count;
1384 c.data_length = data;
1385 c.type = ISCSI_RX_DATA;
1387 return iscsit_do_rx_data(conn, &c);
1391 struct iscsi_conn *conn,
1396 struct iscsi_data_count c;
1398 if (!conn || !conn->sock || !conn->conn_ops)
1401 memset(&c, 0, sizeof(struct iscsi_data_count));
1403 c.iov_count = iov_count;
1404 c.data_length = data;
1405 c.type = ISCSI_TX_DATA;
1407 return iscsit_do_tx_data(conn, &c);
1410 void iscsit_collect_login_stats(
1411 struct iscsi_conn *conn,
1415 struct iscsi_param *intrname = NULL;
1416 struct iscsi_tiqn *tiqn;
1417 struct iscsi_login_stats *ls;
1419 tiqn = iscsit_snmp_get_tiqn(conn);
1423 ls = &tiqn->login_stats;
1425 spin_lock(&ls->lock);
1426 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1427 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1428 /* We already have the failure info for this login */
1429 spin_unlock(&ls->lock);
1433 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1435 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1437 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1438 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1439 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1440 ls->authenticate_fails++;
1441 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1442 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1443 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1444 ls->authorize_fails++;
1445 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1446 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1447 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1448 ls->negotiate_fails++;
1449 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1455 /* Save initiator name, ip address and time, if it is a failed login */
1456 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1457 if (conn->param_list)
1458 intrname = iscsi_find_param_from_key(INITIATORNAME,
1460 strcpy(ls->last_intr_fail_name,
1461 (intrname ? intrname->value : "Unknown"));
1463 ls->last_intr_fail_ip_family = conn->login_family;
1465 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1466 "%s", conn->login_ip);
1467 ls->last_fail_time = get_jiffies_64();
1470 spin_unlock(&ls->lock);
1473 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1475 struct iscsi_portal_group *tpg;
1477 if (!conn || !conn->sess)
1480 tpg = conn->sess->tpg;
1487 return tpg->tpg_tiqn;