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, ignoring.\n", cmdsn,
247 ret = CMDSN_MAXCMDSN_OVERRUN;
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 case CMDSN_MAXCMDSN_OVERRUN:
308 cmd->i_state = ISTATE_REMOVE;
309 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
311 * Existing callers for iscsit_sequence_cmd() will silently
312 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
313 * return for CMDSN_MAXCMDSN_OVERRUN as well..
315 ret = CMDSN_LOWER_THAN_EXP;
318 mutex_unlock(&conn->sess->cmdsn_mutex);
321 iscsit_reject_cmd(cmd, reason, buf);
325 EXPORT_SYMBOL(iscsit_sequence_cmd);
327 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
329 struct iscsi_conn *conn = cmd->conn;
330 struct se_cmd *se_cmd = &cmd->se_cmd;
331 struct iscsi_data *hdr = (struct iscsi_data *) buf;
332 u32 payload_length = ntoh24(hdr->dlength);
334 if (conn->sess->sess_ops->InitialR2T) {
335 pr_err("Received unexpected unsolicited data"
336 " while InitialR2T=Yes, protocol error.\n");
337 transport_send_check_condition_and_sense(se_cmd,
338 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
342 if ((cmd->first_burst_len + payload_length) >
343 conn->sess->sess_ops->FirstBurstLength) {
344 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
345 " for this Unsolicited DataOut Burst.\n",
346 (cmd->first_burst_len + payload_length),
347 conn->sess->sess_ops->FirstBurstLength);
348 transport_send_check_condition_and_sense(se_cmd,
349 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
353 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
356 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
357 ((cmd->first_burst_len + payload_length) !=
358 conn->sess->sess_ops->FirstBurstLength)) {
359 pr_err("Unsolicited non-immediate data received %u"
360 " does not equal FirstBurstLength: %u, and does"
361 " not equal ExpXferLen %u.\n",
362 (cmd->first_burst_len + payload_length),
363 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
364 transport_send_check_condition_and_sense(se_cmd,
365 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
371 struct iscsi_cmd *iscsit_find_cmd_from_itt(
372 struct iscsi_conn *conn,
375 struct iscsi_cmd *cmd;
377 spin_lock_bh(&conn->cmd_lock);
378 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
379 if (cmd->init_task_tag == init_task_tag) {
380 spin_unlock_bh(&conn->cmd_lock);
384 spin_unlock_bh(&conn->cmd_lock);
386 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
387 init_task_tag, conn->cid);
391 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
392 struct iscsi_conn *conn,
396 struct iscsi_cmd *cmd;
398 spin_lock_bh(&conn->cmd_lock);
399 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
400 if (cmd->init_task_tag == init_task_tag) {
401 spin_unlock_bh(&conn->cmd_lock);
405 spin_unlock_bh(&conn->cmd_lock);
407 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
408 " dumping payload\n", init_task_tag, conn->cid);
410 iscsit_dump_data_payload(conn, length, 1);
415 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
416 struct iscsi_conn *conn,
419 struct iscsi_cmd *cmd = NULL;
421 spin_lock_bh(&conn->cmd_lock);
422 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
423 if (cmd->targ_xfer_tag == targ_xfer_tag) {
424 spin_unlock_bh(&conn->cmd_lock);
428 spin_unlock_bh(&conn->cmd_lock);
430 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
431 targ_xfer_tag, conn->cid);
435 int iscsit_find_cmd_for_recovery(
436 struct iscsi_session *sess,
437 struct iscsi_cmd **cmd_ptr,
438 struct iscsi_conn_recovery **cr_ptr,
441 struct iscsi_cmd *cmd = NULL;
442 struct iscsi_conn_recovery *cr;
444 * Scan through the inactive connection recovery list's command list.
445 * If init_task_tag matches the command is still alligent.
447 spin_lock(&sess->cr_i_lock);
448 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
449 spin_lock(&cr->conn_recovery_cmd_lock);
450 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
451 if (cmd->init_task_tag == init_task_tag) {
452 spin_unlock(&cr->conn_recovery_cmd_lock);
453 spin_unlock(&sess->cr_i_lock);
460 spin_unlock(&cr->conn_recovery_cmd_lock);
462 spin_unlock(&sess->cr_i_lock);
464 * Scan through the active connection recovery list's command list.
465 * If init_task_tag matches the command is ready to be reassigned.
467 spin_lock(&sess->cr_a_lock);
468 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
469 spin_lock(&cr->conn_recovery_cmd_lock);
470 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
471 if (cmd->init_task_tag == init_task_tag) {
472 spin_unlock(&cr->conn_recovery_cmd_lock);
473 spin_unlock(&sess->cr_a_lock);
480 spin_unlock(&cr->conn_recovery_cmd_lock);
482 spin_unlock(&sess->cr_a_lock);
487 void iscsit_add_cmd_to_immediate_queue(
488 struct iscsi_cmd *cmd,
489 struct iscsi_conn *conn,
492 struct iscsi_queue_req *qr;
494 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
496 pr_err("Unable to allocate memory for"
497 " struct iscsi_queue_req\n");
500 INIT_LIST_HEAD(&qr->qr_list);
504 spin_lock_bh(&conn->immed_queue_lock);
505 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
506 atomic_inc(&cmd->immed_queue_count);
507 atomic_set(&conn->check_immediate_queue, 1);
508 spin_unlock_bh(&conn->immed_queue_lock);
510 wake_up(&conn->queues_wq);
513 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
515 struct iscsi_queue_req *qr;
517 spin_lock_bh(&conn->immed_queue_lock);
518 if (list_empty(&conn->immed_queue_list)) {
519 spin_unlock_bh(&conn->immed_queue_lock);
522 qr = list_first_entry(&conn->immed_queue_list,
523 struct iscsi_queue_req, qr_list);
525 list_del(&qr->qr_list);
527 atomic_dec(&qr->cmd->immed_queue_count);
528 spin_unlock_bh(&conn->immed_queue_lock);
533 static void iscsit_remove_cmd_from_immediate_queue(
534 struct iscsi_cmd *cmd,
535 struct iscsi_conn *conn)
537 struct iscsi_queue_req *qr, *qr_tmp;
539 spin_lock_bh(&conn->immed_queue_lock);
540 if (!atomic_read(&cmd->immed_queue_count)) {
541 spin_unlock_bh(&conn->immed_queue_lock);
545 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
549 atomic_dec(&qr->cmd->immed_queue_count);
550 list_del(&qr->qr_list);
551 kmem_cache_free(lio_qr_cache, qr);
553 spin_unlock_bh(&conn->immed_queue_lock);
555 if (atomic_read(&cmd->immed_queue_count)) {
556 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
558 atomic_read(&cmd->immed_queue_count));
562 void iscsit_add_cmd_to_response_queue(
563 struct iscsi_cmd *cmd,
564 struct iscsi_conn *conn,
567 struct iscsi_queue_req *qr;
569 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
571 pr_err("Unable to allocate memory for"
572 " struct iscsi_queue_req\n");
575 INIT_LIST_HEAD(&qr->qr_list);
579 spin_lock_bh(&conn->response_queue_lock);
580 list_add_tail(&qr->qr_list, &conn->response_queue_list);
581 atomic_inc(&cmd->response_queue_count);
582 spin_unlock_bh(&conn->response_queue_lock);
584 wake_up(&conn->queues_wq);
587 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
589 struct iscsi_queue_req *qr;
591 spin_lock_bh(&conn->response_queue_lock);
592 if (list_empty(&conn->response_queue_list)) {
593 spin_unlock_bh(&conn->response_queue_lock);
597 qr = list_first_entry(&conn->response_queue_list,
598 struct iscsi_queue_req, qr_list);
600 list_del(&qr->qr_list);
602 atomic_dec(&qr->cmd->response_queue_count);
603 spin_unlock_bh(&conn->response_queue_lock);
608 static void iscsit_remove_cmd_from_response_queue(
609 struct iscsi_cmd *cmd,
610 struct iscsi_conn *conn)
612 struct iscsi_queue_req *qr, *qr_tmp;
614 spin_lock_bh(&conn->response_queue_lock);
615 if (!atomic_read(&cmd->response_queue_count)) {
616 spin_unlock_bh(&conn->response_queue_lock);
620 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
625 atomic_dec(&qr->cmd->response_queue_count);
626 list_del(&qr->qr_list);
627 kmem_cache_free(lio_qr_cache, qr);
629 spin_unlock_bh(&conn->response_queue_lock);
631 if (atomic_read(&cmd->response_queue_count)) {
632 pr_err("ITT: 0x%08x response_queue_count: %d\n",
634 atomic_read(&cmd->response_queue_count));
638 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
642 spin_lock_bh(&conn->immed_queue_lock);
643 empty = list_empty(&conn->immed_queue_list);
644 spin_unlock_bh(&conn->immed_queue_lock);
649 spin_lock_bh(&conn->response_queue_lock);
650 empty = list_empty(&conn->response_queue_list);
651 spin_unlock_bh(&conn->response_queue_lock);
656 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
658 struct iscsi_queue_req *qr, *qr_tmp;
660 spin_lock_bh(&conn->immed_queue_lock);
661 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
662 list_del(&qr->qr_list);
664 atomic_dec(&qr->cmd->immed_queue_count);
666 kmem_cache_free(lio_qr_cache, qr);
668 spin_unlock_bh(&conn->immed_queue_lock);
670 spin_lock_bh(&conn->response_queue_lock);
671 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
673 list_del(&qr->qr_list);
675 atomic_dec(&qr->cmd->response_queue_count);
677 kmem_cache_free(lio_qr_cache, qr);
679 spin_unlock_bh(&conn->response_queue_lock);
682 void iscsit_release_cmd(struct iscsi_cmd *cmd)
684 struct iscsi_session *sess;
685 struct se_cmd *se_cmd = &cmd->se_cmd;
688 sess = cmd->conn->sess;
692 BUG_ON(!sess || !sess->se_sess);
695 kfree(cmd->pdu_list);
696 kfree(cmd->seq_list);
698 kfree(cmd->iov_data);
699 kfree(cmd->text_in_ptr);
701 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
703 EXPORT_SYMBOL(iscsit_release_cmd);
705 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
708 struct iscsi_conn *conn = cmd->conn;
711 if (cmd->data_direction == DMA_TO_DEVICE) {
712 iscsit_stop_dataout_timer(cmd);
713 iscsit_free_r2ts_from_list(cmd);
715 if (cmd->data_direction == DMA_FROM_DEVICE)
716 iscsit_free_all_datain_reqs(cmd);
719 if (conn && check_queues) {
720 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
721 iscsit_remove_cmd_from_response_queue(cmd, conn);
725 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
727 struct se_cmd *se_cmd = NULL;
730 * Determine if a struct se_cmd is associated with
731 * this struct iscsi_cmd.
733 switch (cmd->iscsi_opcode) {
734 case ISCSI_OP_SCSI_CMD:
735 se_cmd = &cmd->se_cmd;
736 __iscsit_free_cmd(cmd, true, shutdown);
740 case ISCSI_OP_SCSI_TMFUNC:
741 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
742 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
743 __iscsit_free_cmd(cmd, true, shutdown);
744 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
747 case ISCSI_OP_REJECT:
749 * Handle special case for REJECT when iscsi_add_reject*() has
750 * overwritten the original iscsi_opcode assignment, and the
751 * associated cmd->se_cmd needs to be released.
753 if (cmd->se_cmd.se_tfo != NULL) {
754 se_cmd = &cmd->se_cmd;
755 __iscsit_free_cmd(cmd, true, shutdown);
757 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
758 if (!rc && shutdown && se_cmd->se_sess) {
759 __iscsit_free_cmd(cmd, true, shutdown);
760 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
766 __iscsit_free_cmd(cmd, false, shutdown);
767 iscsit_release_cmd(cmd);
772 int iscsit_check_session_usage_count(struct iscsi_session *sess)
774 spin_lock_bh(&sess->session_usage_lock);
775 if (sess->session_usage_count != 0) {
776 sess->session_waiting_on_uc = 1;
777 spin_unlock_bh(&sess->session_usage_lock);
781 wait_for_completion(&sess->session_waiting_on_uc_comp);
784 spin_unlock_bh(&sess->session_usage_lock);
789 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
791 spin_lock_bh(&sess->session_usage_lock);
792 sess->session_usage_count--;
794 if (!sess->session_usage_count && sess->session_waiting_on_uc)
795 complete(&sess->session_waiting_on_uc_comp);
797 spin_unlock_bh(&sess->session_usage_lock);
800 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
802 spin_lock_bh(&sess->session_usage_lock);
803 sess->session_usage_count++;
804 spin_unlock_bh(&sess->session_usage_lock);
808 * Setup conn->if_marker and conn->of_marker values based upon
809 * the initial marker-less interval. (see iSCSI v19 A.2)
811 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
813 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
815 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
817 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
818 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
820 if (conn->conn_ops->OFMarker) {
822 * Account for the first Login Command received not
823 * via iscsi_recv_msg().
825 conn->of_marker += ISCSI_HDR_LEN;
826 if (conn->of_marker <= OFMarkInt) {
827 conn->of_marker = (OFMarkInt - conn->of_marker);
829 login_ofmarker_count = (conn->of_marker / OFMarkInt);
830 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
831 (login_ofmarker_count * MARKER_SIZE);
832 conn->of_marker = (next_marker - conn->of_marker);
834 conn->of_marker_offset = 0;
835 pr_debug("Setting OFMarker value to %u based on Initial"
836 " Markerless Interval.\n", conn->of_marker);
839 if (conn->conn_ops->IFMarker) {
840 if (conn->if_marker <= IFMarkInt) {
841 conn->if_marker = (IFMarkInt - conn->if_marker);
843 login_ifmarker_count = (conn->if_marker / IFMarkInt);
844 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
845 (login_ifmarker_count * MARKER_SIZE);
846 conn->if_marker = (next_marker - conn->if_marker);
848 pr_debug("Setting IFMarker value to %u based on Initial"
849 " Markerless Interval.\n", conn->if_marker);
855 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
857 struct iscsi_conn *conn;
859 spin_lock_bh(&sess->conn_lock);
860 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
861 if ((conn->cid == cid) &&
862 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
863 iscsit_inc_conn_usage_count(conn);
864 spin_unlock_bh(&sess->conn_lock);
868 spin_unlock_bh(&sess->conn_lock);
873 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
875 struct iscsi_conn *conn;
877 spin_lock_bh(&sess->conn_lock);
878 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
879 if (conn->cid == cid) {
880 iscsit_inc_conn_usage_count(conn);
881 spin_lock(&conn->state_lock);
882 atomic_set(&conn->connection_wait_rcfr, 1);
883 spin_unlock(&conn->state_lock);
884 spin_unlock_bh(&sess->conn_lock);
888 spin_unlock_bh(&sess->conn_lock);
893 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
895 spin_lock_bh(&conn->conn_usage_lock);
896 if (conn->conn_usage_count != 0) {
897 conn->conn_waiting_on_uc = 1;
898 spin_unlock_bh(&conn->conn_usage_lock);
900 wait_for_completion(&conn->conn_waiting_on_uc_comp);
903 spin_unlock_bh(&conn->conn_usage_lock);
906 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
908 spin_lock_bh(&conn->conn_usage_lock);
909 conn->conn_usage_count--;
911 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
912 complete(&conn->conn_waiting_on_uc_comp);
914 spin_unlock_bh(&conn->conn_usage_lock);
917 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
919 spin_lock_bh(&conn->conn_usage_lock);
920 conn->conn_usage_count++;
921 spin_unlock_bh(&conn->conn_usage_lock);
924 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
927 struct iscsi_cmd *cmd;
929 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
933 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
934 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
935 ISTATE_SEND_NOPIN_NO_RESPONSE;
936 cmd->init_task_tag = RESERVED_ITT;
937 spin_lock_bh(&conn->sess->ttt_lock);
938 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
940 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
941 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
942 spin_unlock_bh(&conn->sess->ttt_lock);
944 spin_lock_bh(&conn->cmd_lock);
945 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
946 spin_unlock_bh(&conn->cmd_lock);
949 iscsit_start_nopin_response_timer(conn);
950 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
955 static void iscsit_handle_nopin_response_timeout(unsigned long data)
957 struct iscsi_conn *conn = (struct iscsi_conn *) data;
959 iscsit_inc_conn_usage_count(conn);
961 spin_lock_bh(&conn->nopin_timer_lock);
962 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
963 spin_unlock_bh(&conn->nopin_timer_lock);
964 iscsit_dec_conn_usage_count(conn);
968 pr_debug("Did not receive response to NOPIN on CID: %hu on"
969 " SID: %u, failing connection.\n", conn->cid,
971 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
972 spin_unlock_bh(&conn->nopin_timer_lock);
975 struct iscsi_portal_group *tpg = conn->sess->tpg;
976 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
979 spin_lock_bh(&tiqn->sess_err_stats.lock);
980 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
981 conn->sess->sess_ops->InitiatorName);
982 tiqn->sess_err_stats.last_sess_failure_type =
983 ISCSI_SESS_ERR_CXN_TIMEOUT;
984 tiqn->sess_err_stats.cxn_timeout_errors++;
985 atomic_long_inc(&conn->sess->conn_timeout_errors);
986 spin_unlock_bh(&tiqn->sess_err_stats.lock);
990 iscsit_cause_connection_reinstatement(conn, 0);
991 iscsit_dec_conn_usage_count(conn);
994 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
996 struct iscsi_session *sess = conn->sess;
997 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
999 spin_lock_bh(&conn->nopin_timer_lock);
1000 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1001 spin_unlock_bh(&conn->nopin_timer_lock);
1005 mod_timer(&conn->nopin_response_timer,
1006 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1007 spin_unlock_bh(&conn->nopin_timer_lock);
1011 * Called with conn->nopin_timer_lock held.
1013 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1015 struct iscsi_session *sess = conn->sess;
1016 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1018 spin_lock_bh(&conn->nopin_timer_lock);
1019 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1020 spin_unlock_bh(&conn->nopin_timer_lock);
1024 init_timer(&conn->nopin_response_timer);
1025 conn->nopin_response_timer.expires =
1026 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1027 conn->nopin_response_timer.data = (unsigned long)conn;
1028 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1029 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1030 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1031 add_timer(&conn->nopin_response_timer);
1033 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1034 " seconds\n", conn->cid, na->nopin_response_timeout);
1035 spin_unlock_bh(&conn->nopin_timer_lock);
1038 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1040 spin_lock_bh(&conn->nopin_timer_lock);
1041 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1045 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1048 del_timer_sync(&conn->nopin_response_timer);
1050 spin_lock_bh(&conn->nopin_timer_lock);
1051 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1052 spin_unlock_bh(&conn->nopin_timer_lock);
1055 static void iscsit_handle_nopin_timeout(unsigned long data)
1057 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1059 iscsit_inc_conn_usage_count(conn);
1061 spin_lock_bh(&conn->nopin_timer_lock);
1062 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1063 spin_unlock_bh(&conn->nopin_timer_lock);
1064 iscsit_dec_conn_usage_count(conn);
1067 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1070 iscsit_add_nopin(conn, 1);
1071 iscsit_dec_conn_usage_count(conn);
1075 * Called with conn->nopin_timer_lock held.
1077 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1079 struct iscsi_session *sess = conn->sess;
1080 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1082 * NOPIN timeout is disabled.
1084 if (!na->nopin_timeout)
1087 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1090 init_timer(&conn->nopin_timer);
1091 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1092 conn->nopin_timer.data = (unsigned long)conn;
1093 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1094 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1095 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1096 add_timer(&conn->nopin_timer);
1098 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1099 " interval\n", conn->cid, na->nopin_timeout);
1102 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1104 struct iscsi_session *sess = conn->sess;
1105 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1107 * NOPIN timeout is disabled..
1109 if (!na->nopin_timeout)
1112 spin_lock_bh(&conn->nopin_timer_lock);
1113 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1114 spin_unlock_bh(&conn->nopin_timer_lock);
1118 init_timer(&conn->nopin_timer);
1119 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1120 conn->nopin_timer.data = (unsigned long)conn;
1121 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1122 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1123 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1124 add_timer(&conn->nopin_timer);
1126 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1127 " interval\n", conn->cid, na->nopin_timeout);
1128 spin_unlock_bh(&conn->nopin_timer_lock);
1131 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1133 spin_lock_bh(&conn->nopin_timer_lock);
1134 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1135 spin_unlock_bh(&conn->nopin_timer_lock);
1138 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1139 spin_unlock_bh(&conn->nopin_timer_lock);
1141 del_timer_sync(&conn->nopin_timer);
1143 spin_lock_bh(&conn->nopin_timer_lock);
1144 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1145 spin_unlock_bh(&conn->nopin_timer_lock);
1148 int iscsit_send_tx_data(
1149 struct iscsi_cmd *cmd,
1150 struct iscsi_conn *conn,
1153 int tx_sent, tx_size;
1158 tx_size = cmd->tx_size;
1161 iov = &cmd->iov_data[0];
1162 iov_count = cmd->iov_data_count;
1164 iov = &cmd->iov_misc[0];
1165 iov_count = cmd->iov_misc_count;
1168 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1169 if (tx_size != tx_sent) {
1170 if (tx_sent == -EAGAIN) {
1171 pr_err("tx_data() returned -EAGAIN\n");
1181 int iscsit_fe_sendpage_sg(
1182 struct iscsi_cmd *cmd,
1183 struct iscsi_conn *conn)
1185 struct scatterlist *sg = cmd->first_data_sg;
1187 u32 tx_hdr_size, data_len;
1188 u32 offset = cmd->first_data_sg_off;
1189 int tx_sent, iov_off;
1192 tx_hdr_size = ISCSI_HDR_LEN;
1193 if (conn->conn_ops->HeaderDigest)
1194 tx_hdr_size += ISCSI_CRC_LEN;
1196 iov.iov_base = cmd->pdu;
1197 iov.iov_len = tx_hdr_size;
1199 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1200 if (tx_hdr_size != tx_sent) {
1201 if (tx_sent == -EAGAIN) {
1202 pr_err("tx_data() returned -EAGAIN\n");
1208 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1210 * Set iov_off used by padding and data digest tx_data() calls below
1211 * in order to determine proper offset into cmd->iov_data[]
1213 if (conn->conn_ops->DataDigest) {
1214 data_len -= ISCSI_CRC_LEN;
1216 iov_off = (cmd->iov_data_count - 2);
1218 iov_off = (cmd->iov_data_count - 1);
1220 iov_off = (cmd->iov_data_count - 1);
1223 * Perform sendpage() for each page in the scatterlist
1226 u32 space = (sg->length - offset);
1227 u32 sub_len = min_t(u32, data_len, space);
1229 tx_sent = conn->sock->ops->sendpage(conn->sock,
1230 sg_page(sg), sg->offset + offset, sub_len, 0);
1231 if (tx_sent != sub_len) {
1232 if (tx_sent == -EAGAIN) {
1233 pr_err("tcp_sendpage() returned"
1238 pr_err("tcp_sendpage() failure: %d\n",
1243 data_len -= sub_len;
1250 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1252 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1253 if (cmd->padding != tx_sent) {
1254 if (tx_sent == -EAGAIN) {
1255 pr_err("tx_data() returned -EAGAIN\n");
1263 if (conn->conn_ops->DataDigest) {
1264 struct kvec *iov_d = &cmd->iov_data[iov_off];
1266 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1267 if (ISCSI_CRC_LEN != tx_sent) {
1268 if (tx_sent == -EAGAIN) {
1269 pr_err("tx_data() returned -EAGAIN\n");
1280 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1281 * back to the Initiator when an expection condition occurs with the
1282 * errors set in status_class and status_detail.
1284 * Parameters: iSCSI Connection, Status Class, Status Detail.
1285 * Returns: 0 on success, -1 on error.
1287 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1289 struct iscsi_login_rsp *hdr;
1290 struct iscsi_login *login = conn->conn_login;
1292 login->login_failed = 1;
1293 iscsit_collect_login_stats(conn, status_class, status_detail);
1295 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1296 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1297 hdr->status_class = status_class;
1298 hdr->status_detail = status_detail;
1299 hdr->itt = conn->login_itt;
1301 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1304 void iscsit_print_session_params(struct iscsi_session *sess)
1306 struct iscsi_conn *conn;
1308 pr_debug("-----------------------------[Session Params for"
1309 " SID: %u]-----------------------------\n", sess->sid);
1310 spin_lock_bh(&sess->conn_lock);
1311 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1312 iscsi_dump_conn_ops(conn->conn_ops);
1313 spin_unlock_bh(&sess->conn_lock);
1315 iscsi_dump_sess_ops(sess->sess_ops);
1318 static int iscsit_do_rx_data(
1319 struct iscsi_conn *conn,
1320 struct iscsi_data_count *count)
1322 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1326 if (!conn || !conn->sock || !conn->conn_ops)
1329 memset(&msg, 0, sizeof(struct msghdr));
1332 iov_len = count->iov_count;
1334 while (total_rx < data) {
1335 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1336 (data - total_rx), MSG_WAITALL);
1338 pr_debug("rx_loop: %d total_rx: %d\n",
1342 total_rx += rx_loop;
1343 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1344 rx_loop, total_rx, data);
1350 static int iscsit_do_tx_data(
1351 struct iscsi_conn *conn,
1352 struct iscsi_data_count *count)
1354 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1358 if (!conn || !conn->sock || !conn->conn_ops)
1362 pr_err("Data length is: %d\n", data);
1366 memset(&msg, 0, sizeof(struct msghdr));
1369 iov_len = count->iov_count;
1371 while (total_tx < data) {
1372 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1375 pr_debug("tx_loop: %d total_tx %d\n",
1379 total_tx += tx_loop;
1380 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1381 tx_loop, total_tx, data);
1388 struct iscsi_conn *conn,
1393 struct iscsi_data_count c;
1395 if (!conn || !conn->sock || !conn->conn_ops)
1398 memset(&c, 0, sizeof(struct iscsi_data_count));
1400 c.iov_count = iov_count;
1401 c.data_length = data;
1402 c.type = ISCSI_RX_DATA;
1404 return iscsit_do_rx_data(conn, &c);
1408 struct iscsi_conn *conn,
1413 struct iscsi_data_count c;
1415 if (!conn || !conn->sock || !conn->conn_ops)
1418 memset(&c, 0, sizeof(struct iscsi_data_count));
1420 c.iov_count = iov_count;
1421 c.data_length = data;
1422 c.type = ISCSI_TX_DATA;
1424 return iscsit_do_tx_data(conn, &c);
1427 void iscsit_collect_login_stats(
1428 struct iscsi_conn *conn,
1432 struct iscsi_param *intrname = NULL;
1433 struct iscsi_tiqn *tiqn;
1434 struct iscsi_login_stats *ls;
1436 tiqn = iscsit_snmp_get_tiqn(conn);
1440 ls = &tiqn->login_stats;
1442 spin_lock(&ls->lock);
1443 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1444 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1445 /* We already have the failure info for this login */
1446 spin_unlock(&ls->lock);
1450 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1452 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1454 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1455 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1456 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1457 ls->authenticate_fails++;
1458 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1459 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1460 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1461 ls->authorize_fails++;
1462 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1463 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1464 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1465 ls->negotiate_fails++;
1466 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1472 /* Save initiator name, ip address and time, if it is a failed login */
1473 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1474 if (conn->param_list)
1475 intrname = iscsi_find_param_from_key(INITIATORNAME,
1477 strcpy(ls->last_intr_fail_name,
1478 (intrname ? intrname->value : "Unknown"));
1480 ls->last_intr_fail_ip_family = conn->login_family;
1482 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1483 "%s", conn->login_ip);
1484 ls->last_fail_time = get_jiffies_64();
1487 spin_unlock(&ls->lock);
1490 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1492 struct iscsi_portal_group *tpg;
1494 if (!conn || !conn->sess)
1497 tpg = conn->sess->tpg;
1504 return tpg->tpg_tiqn;