1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
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/string.h>
20 #include <linux/kthread.h>
21 #include <linux/crypto.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/idr.h>
25 #include <asm/unaligned.h>
26 #include <scsi/scsi_device.h>
27 #include <scsi/iscsi_proto.h>
28 #include <scsi/scsi_tcq.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_fabric.h>
31 #include <target/target_core_configfs.h>
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
50 #include <target/iscsi/iscsi_transport.h>
52 static LIST_HEAD(g_tiqn_list
);
53 static LIST_HEAD(g_np_list
);
54 static DEFINE_SPINLOCK(tiqn_lock
);
55 static DEFINE_MUTEX(np_lock
);
57 static struct idr tiqn_idr
;
59 struct mutex auth_id_lock
;
60 spinlock_t sess_idr_lock
;
62 struct iscsit_global
*iscsit_global
;
64 struct kmem_cache
*lio_qr_cache
;
65 struct kmem_cache
*lio_dr_cache
;
66 struct kmem_cache
*lio_ooo_cache
;
67 struct kmem_cache
*lio_r2t_cache
;
69 static int iscsit_handle_immediate_data(struct iscsi_cmd
*,
70 struct iscsi_scsi_req
*, u32
);
72 struct iscsi_tiqn
*iscsit_get_tiqn_for_login(unsigned char *buf
)
74 struct iscsi_tiqn
*tiqn
= NULL
;
76 spin_lock(&tiqn_lock
);
77 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
78 if (!strcmp(tiqn
->tiqn
, buf
)) {
80 spin_lock(&tiqn
->tiqn_state_lock
);
81 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
82 tiqn
->tiqn_access_count
++;
83 spin_unlock(&tiqn
->tiqn_state_lock
);
84 spin_unlock(&tiqn_lock
);
87 spin_unlock(&tiqn
->tiqn_state_lock
);
90 spin_unlock(&tiqn_lock
);
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn
*tiqn
)
97 spin_lock(&tiqn
->tiqn_state_lock
);
98 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
99 tiqn
->tiqn_state
= TIQN_STATE_SHUTDOWN
;
100 spin_unlock(&tiqn
->tiqn_state_lock
);
103 spin_unlock(&tiqn
->tiqn_state_lock
);
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn
*tiqn
)
110 spin_lock(&tiqn
->tiqn_state_lock
);
111 tiqn
->tiqn_access_count
--;
112 spin_unlock(&tiqn
->tiqn_state_lock
);
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
119 struct iscsi_tiqn
*iscsit_add_tiqn(unsigned char *buf
)
121 struct iscsi_tiqn
*tiqn
= NULL
;
124 if (strlen(buf
) >= ISCSI_IQN_LEN
) {
125 pr_err("Target IQN exceeds %d bytes\n",
127 return ERR_PTR(-EINVAL
);
130 tiqn
= kzalloc(sizeof(struct iscsi_tiqn
), GFP_KERNEL
);
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM
);
136 sprintf(tiqn
->tiqn
, "%s", buf
);
137 INIT_LIST_HEAD(&tiqn
->tiqn_list
);
138 INIT_LIST_HEAD(&tiqn
->tiqn_tpg_list
);
139 spin_lock_init(&tiqn
->tiqn_state_lock
);
140 spin_lock_init(&tiqn
->tiqn_tpg_lock
);
141 spin_lock_init(&tiqn
->sess_err_stats
.lock
);
142 spin_lock_init(&tiqn
->login_stats
.lock
);
143 spin_lock_init(&tiqn
->logout_stats
.lock
);
145 tiqn
->tiqn_state
= TIQN_STATE_ACTIVE
;
147 idr_preload(GFP_KERNEL
);
148 spin_lock(&tiqn_lock
);
150 ret
= idr_alloc(&tiqn_idr
, NULL
, 0, 0, GFP_NOWAIT
);
152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
153 spin_unlock(&tiqn_lock
);
158 tiqn
->tiqn_index
= ret
;
159 list_add_tail(&tiqn
->tiqn_list
, &g_tiqn_list
);
161 spin_unlock(&tiqn_lock
);
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn
->tiqn
);
170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn
*tiqn
)
173 * Wait for accesses to said struct iscsi_tiqn to end.
175 spin_lock(&tiqn
->tiqn_state_lock
);
176 while (tiqn
->tiqn_access_count
!= 0) {
177 spin_unlock(&tiqn
->tiqn_state_lock
);
179 spin_lock(&tiqn
->tiqn_state_lock
);
181 spin_unlock(&tiqn
->tiqn_state_lock
);
184 void iscsit_del_tiqn(struct iscsi_tiqn
*tiqn
)
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
192 if (iscsit_set_tiqn_shutdown(tiqn
) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 iscsit_wait_for_tiqn(tiqn
);
199 spin_lock(&tiqn_lock
);
200 list_del(&tiqn
->tiqn_list
);
201 idr_remove(&tiqn_idr
, tiqn
->tiqn_index
);
202 spin_unlock(&tiqn_lock
);
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
209 int iscsit_access_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
)
213 * Determine if the network portal is accepting storage traffic.
215 spin_lock_bh(&np
->np_thread_lock
);
216 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
217 spin_unlock_bh(&np
->np_thread_lock
);
220 spin_unlock_bh(&np
->np_thread_lock
);
222 * Determine if the portal group is accepting storage traffic.
224 spin_lock_bh(&tpg
->tpg_state_lock
);
225 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
226 spin_unlock_bh(&tpg
->tpg_state_lock
);
229 spin_unlock_bh(&tpg
->tpg_state_lock
);
232 * Here we serialize access across the TIQN+TPG Tuple.
234 ret
= down_interruptible(&tpg
->np_login_sem
);
235 if ((ret
!= 0) || signal_pending(current
))
238 spin_lock_bh(&tpg
->tpg_state_lock
);
239 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
240 spin_unlock_bh(&tpg
->tpg_state_lock
);
241 up(&tpg
->np_login_sem
);
244 spin_unlock_bh(&tpg
->tpg_state_lock
);
249 void iscsit_login_kref_put(struct kref
*kref
)
251 struct iscsi_tpg_np
*tpg_np
= container_of(kref
,
252 struct iscsi_tpg_np
, tpg_np_kref
);
254 complete(&tpg_np
->tpg_np_comp
);
257 int iscsit_deaccess_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
,
258 struct iscsi_tpg_np
*tpg_np
)
260 struct iscsi_tiqn
*tiqn
= tpg
->tpg_tiqn
;
262 up(&tpg
->np_login_sem
);
265 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
268 iscsit_put_tiqn_for_login(tiqn
);
273 bool iscsit_check_np_match(
274 struct __kernel_sockaddr_storage
*sockaddr
,
276 int network_transport
)
278 struct sockaddr_in
*sock_in
, *sock_in_e
;
279 struct sockaddr_in6
*sock_in6
, *sock_in6_e
;
280 bool ip_match
= false;
283 if (sockaddr
->ss_family
== AF_INET6
) {
284 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
285 sock_in6_e
= (struct sockaddr_in6
*)&np
->np_sockaddr
;
287 if (!memcmp(&sock_in6
->sin6_addr
.in6_u
,
288 &sock_in6_e
->sin6_addr
.in6_u
,
289 sizeof(struct in6_addr
)))
292 port
= ntohs(sock_in6
->sin6_port
);
294 sock_in
= (struct sockaddr_in
*)sockaddr
;
295 sock_in_e
= (struct sockaddr_in
*)&np
->np_sockaddr
;
297 if (sock_in
->sin_addr
.s_addr
== sock_in_e
->sin_addr
.s_addr
)
300 port
= ntohs(sock_in
->sin_port
);
303 if (ip_match
&& (np
->np_port
== port
) &&
304 (np
->np_network_transport
== network_transport
))
311 * Called with mutex np_lock held
313 static struct iscsi_np
*iscsit_get_np(
314 struct __kernel_sockaddr_storage
*sockaddr
,
315 int network_transport
)
320 list_for_each_entry(np
, &g_np_list
, np_list
) {
321 spin_lock_bh(&np
->np_thread_lock
);
322 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
323 spin_unlock_bh(&np
->np_thread_lock
);
327 match
= iscsit_check_np_match(sockaddr
, np
, network_transport
);
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
335 spin_unlock_bh(&np
->np_thread_lock
);
338 spin_unlock_bh(&np
->np_thread_lock
);
344 struct iscsi_np
*iscsit_add_np(
345 struct __kernel_sockaddr_storage
*sockaddr
,
347 int network_transport
)
349 struct sockaddr_in
*sock_in
;
350 struct sockaddr_in6
*sock_in6
;
354 mutex_lock(&np_lock
);
357 * Locate the existing struct iscsi_np if already active..
359 np
= iscsit_get_np(sockaddr
, network_transport
);
361 mutex_unlock(&np_lock
);
365 np
= kzalloc(sizeof(struct iscsi_np
), GFP_KERNEL
);
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
368 mutex_unlock(&np_lock
);
369 return ERR_PTR(-ENOMEM
);
372 np
->np_flags
|= NPF_IP_NETWORK
;
373 if (sockaddr
->ss_family
== AF_INET6
) {
374 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
375 snprintf(np
->np_ip
, IPV6_ADDRESS_SPACE
, "%s", ip_str
);
376 np
->np_port
= ntohs(sock_in6
->sin6_port
);
378 sock_in
= (struct sockaddr_in
*)sockaddr
;
379 sprintf(np
->np_ip
, "%s", ip_str
);
380 np
->np_port
= ntohs(sock_in
->sin_port
);
383 np
->np_network_transport
= network_transport
;
384 spin_lock_init(&np
->np_thread_lock
);
385 init_completion(&np
->np_restart_comp
);
386 INIT_LIST_HEAD(&np
->np_list
);
388 ret
= iscsi_target_setup_login_socket(np
, sockaddr
);
391 mutex_unlock(&np_lock
);
395 np
->np_thread
= kthread_run(iscsi_target_login_thread
, np
, "iscsi_np");
396 if (IS_ERR(np
->np_thread
)) {
397 pr_err("Unable to create kthread: iscsi_np\n");
398 ret
= PTR_ERR(np
->np_thread
);
400 mutex_unlock(&np_lock
);
404 * Increment the np_exports reference count now to prevent
405 * iscsit_del_np() below from being run while a new call to
406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
407 * active. We don't need to hold np->np_thread_lock at this
408 * point because iscsi_np has not been added to g_np_list yet.
411 np
->np_thread_state
= ISCSI_NP_THREAD_ACTIVE
;
413 list_add_tail(&np
->np_list
, &g_np_list
);
414 mutex_unlock(&np_lock
);
416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
417 np
->np_ip
, np
->np_port
, np
->np_transport
->name
);
422 int iscsit_reset_np_thread(
424 struct iscsi_tpg_np
*tpg_np
,
425 struct iscsi_portal_group
*tpg
,
428 spin_lock_bh(&np
->np_thread_lock
);
429 if (np
->np_thread_state
== ISCSI_NP_THREAD_INACTIVE
) {
430 spin_unlock_bh(&np
->np_thread_lock
);
433 np
->np_thread_state
= ISCSI_NP_THREAD_RESET
;
436 spin_unlock_bh(&np
->np_thread_lock
);
437 send_sig(SIGINT
, np
->np_thread
, 1);
438 wait_for_completion(&np
->np_restart_comp
);
439 spin_lock_bh(&np
->np_thread_lock
);
441 spin_unlock_bh(&np
->np_thread_lock
);
443 if (tpg_np
&& shutdown
) {
444 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
446 wait_for_completion(&tpg_np
->tpg_np_comp
);
452 static void iscsit_free_np(struct iscsi_np
*np
)
455 sock_release(np
->np_socket
);
458 int iscsit_del_np(struct iscsi_np
*np
)
460 spin_lock_bh(&np
->np_thread_lock
);
462 if (np
->np_exports
) {
464 spin_unlock_bh(&np
->np_thread_lock
);
467 np
->np_thread_state
= ISCSI_NP_THREAD_SHUTDOWN
;
468 spin_unlock_bh(&np
->np_thread_lock
);
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
475 send_sig(SIGINT
, np
->np_thread
, 1);
476 kthread_stop(np
->np_thread
);
477 np
->np_thread
= NULL
;
480 np
->np_transport
->iscsit_free_np(np
);
482 mutex_lock(&np_lock
);
483 list_del(&np
->np_list
);
484 mutex_unlock(&np_lock
);
486 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
487 np
->np_ip
, np
->np_port
, np
->np_transport
->name
);
489 iscsit_put_transport(np
->np_transport
);
494 static int iscsit_immediate_queue(struct iscsi_conn
*, struct iscsi_cmd
*, int);
495 static int iscsit_response_queue(struct iscsi_conn
*, struct iscsi_cmd
*, int);
497 static int iscsit_queue_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
499 iscsit_add_cmd_to_response_queue(cmd
, cmd
->conn
, cmd
->i_state
);
503 static void iscsit_aborted_task(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
505 bool scsi_cmd
= (cmd
->iscsi_opcode
== ISCSI_OP_SCSI_CMD
);
507 spin_lock_bh(&conn
->cmd_lock
);
508 if (!list_empty(&cmd
->i_conn_node
))
509 list_del_init(&cmd
->i_conn_node
);
510 spin_unlock_bh(&conn
->cmd_lock
);
512 __iscsit_free_cmd(cmd
, scsi_cmd
, true);
515 static enum target_prot_op
iscsit_get_sup_prot_ops(struct iscsi_conn
*conn
)
517 return TARGET_PROT_NORMAL
;
520 static struct iscsit_transport iscsi_target_transport
= {
522 .transport_type
= ISCSI_TCP
,
524 .iscsit_setup_np
= iscsit_setup_np
,
525 .iscsit_accept_np
= iscsit_accept_np
,
526 .iscsit_free_np
= iscsit_free_np
,
527 .iscsit_get_login_rx
= iscsit_get_login_rx
,
528 .iscsit_put_login_tx
= iscsit_put_login_tx
,
529 .iscsit_get_dataout
= iscsit_build_r2ts_for_cmd
,
530 .iscsit_immediate_queue
= iscsit_immediate_queue
,
531 .iscsit_response_queue
= iscsit_response_queue
,
532 .iscsit_queue_data_in
= iscsit_queue_rsp
,
533 .iscsit_queue_status
= iscsit_queue_rsp
,
534 .iscsit_aborted_task
= iscsit_aborted_task
,
535 .iscsit_get_sup_prot_ops
= iscsit_get_sup_prot_ops
,
538 static int __init
iscsi_target_init_module(void)
542 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
544 iscsit_global
= kzalloc(sizeof(struct iscsit_global
), GFP_KERNEL
);
545 if (!iscsit_global
) {
546 pr_err("Unable to allocate memory for iscsit_global\n");
549 mutex_init(&auth_id_lock
);
550 spin_lock_init(&sess_idr_lock
);
554 ret
= iscsi_target_register_configfs();
558 ret
= iscsi_thread_set_init();
562 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT
) !=
563 TARGET_THREAD_SET_COUNT
) {
564 pr_err("iscsi_allocate_thread_sets() returned"
565 " unexpected value!\n");
569 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
570 sizeof(struct iscsi_queue_req
),
571 __alignof__(struct iscsi_queue_req
), 0, NULL
);
573 pr_err("nable to kmem_cache_create() for"
578 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
579 sizeof(struct iscsi_datain_req
),
580 __alignof__(struct iscsi_datain_req
), 0, NULL
);
582 pr_err("Unable to kmem_cache_create() for"
587 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
588 sizeof(struct iscsi_ooo_cmdsn
),
589 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
590 if (!lio_ooo_cache
) {
591 pr_err("Unable to kmem_cache_create() for"
596 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
597 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
599 if (!lio_r2t_cache
) {
600 pr_err("Unable to kmem_cache_create() for"
605 iscsit_register_transport(&iscsi_target_transport
);
607 if (iscsit_load_discovery_tpg() < 0)
612 iscsit_unregister_transport(&iscsi_target_transport
);
613 kmem_cache_destroy(lio_r2t_cache
);
615 kmem_cache_destroy(lio_ooo_cache
);
617 kmem_cache_destroy(lio_dr_cache
);
619 kmem_cache_destroy(lio_qr_cache
);
621 iscsi_deallocate_thread_sets();
623 iscsi_thread_set_free();
625 iscsi_target_deregister_configfs();
627 kfree(iscsit_global
);
631 static void __exit
iscsi_target_cleanup_module(void)
633 iscsi_deallocate_thread_sets();
634 iscsi_thread_set_free();
635 iscsit_release_discovery_tpg();
636 iscsit_unregister_transport(&iscsi_target_transport
);
637 kmem_cache_destroy(lio_qr_cache
);
638 kmem_cache_destroy(lio_dr_cache
);
639 kmem_cache_destroy(lio_ooo_cache
);
640 kmem_cache_destroy(lio_r2t_cache
);
642 iscsi_target_deregister_configfs();
644 kfree(iscsit_global
);
647 static int iscsit_add_reject(
648 struct iscsi_conn
*conn
,
652 struct iscsi_cmd
*cmd
;
654 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
658 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
659 cmd
->reject_reason
= reason
;
661 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
663 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
664 iscsit_free_cmd(cmd
, false);
668 spin_lock_bh(&conn
->cmd_lock
);
669 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
670 spin_unlock_bh(&conn
->cmd_lock
);
672 cmd
->i_state
= ISTATE_SEND_REJECT
;
673 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
678 static int iscsit_add_reject_from_cmd(
679 struct iscsi_cmd
*cmd
,
684 struct iscsi_conn
*conn
;
687 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
693 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
694 cmd
->reject_reason
= reason
;
696 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
698 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
699 iscsit_free_cmd(cmd
, false);
704 spin_lock_bh(&conn
->cmd_lock
);
705 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
706 spin_unlock_bh(&conn
->cmd_lock
);
709 cmd
->i_state
= ISTATE_SEND_REJECT
;
710 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
712 * Perform the kref_put now if se_cmd has already been setup by
713 * scsit_setup_scsi_cmd()
715 if (cmd
->se_cmd
.se_tfo
!= NULL
) {
716 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
717 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
722 static int iscsit_add_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
,
725 return iscsit_add_reject_from_cmd(cmd
, reason
, true, buf
);
728 int iscsit_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
, unsigned char *buf
)
730 return iscsit_add_reject_from_cmd(cmd
, reason
, false, buf
);
734 * Map some portion of the allocated scatterlist to an iovec, suitable for
735 * kernel sockets to copy data in/out.
737 static int iscsit_map_iovec(
738 struct iscsi_cmd
*cmd
,
744 struct scatterlist
*sg
;
745 unsigned int page_off
;
748 * We know each entry in t_data_sg contains a page.
750 sg
= &cmd
->se_cmd
.t_data_sg
[data_offset
/ PAGE_SIZE
];
751 page_off
= (data_offset
% PAGE_SIZE
);
753 cmd
->first_data_sg
= sg
;
754 cmd
->first_data_sg_off
= page_off
;
756 while (data_length
) {
757 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
759 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
760 iov
[i
].iov_len
= cur_len
;
762 data_length
-= cur_len
;
768 cmd
->kmapped_nents
= i
;
773 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
776 struct scatterlist
*sg
;
778 sg
= cmd
->first_data_sg
;
780 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
781 kunmap(sg_page(&sg
[i
]));
784 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
787 struct iscsi_cmd
*cmd
, *cmd_p
;
789 conn
->exp_statsn
= exp_statsn
;
791 if (conn
->sess
->sess_ops
->RDMAExtensions
)
794 spin_lock_bh(&conn
->cmd_lock
);
795 list_for_each_entry_safe(cmd
, cmd_p
, &conn
->conn_cmd_list
, i_conn_node
) {
796 spin_lock(&cmd
->istate_lock
);
797 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
798 iscsi_sna_lt(cmd
->stat_sn
, exp_statsn
)) {
799 cmd
->i_state
= ISTATE_REMOVE
;
800 spin_unlock(&cmd
->istate_lock
);
801 list_move_tail(&cmd
->i_conn_node
, &ack_list
);
804 spin_unlock(&cmd
->istate_lock
);
806 spin_unlock_bh(&conn
->cmd_lock
);
808 list_for_each_entry_safe(cmd
, cmd_p
, &ack_list
, i_conn_node
) {
809 list_del_init(&cmd
->i_conn_node
);
810 iscsit_free_cmd(cmd
, false);
814 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
816 u32 iov_count
= max(1UL, DIV_ROUND_UP(cmd
->se_cmd
.data_length
, PAGE_SIZE
));
818 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
820 cmd
->iov_data
= kzalloc(iov_count
* sizeof(struct kvec
), GFP_KERNEL
);
821 if (!cmd
->iov_data
) {
822 pr_err("Unable to allocate cmd->iov_data\n");
826 cmd
->orig_iov_data_count
= iov_count
;
830 int iscsit_setup_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
833 int data_direction
, payload_length
;
834 struct iscsi_scsi_req
*hdr
;
838 atomic_long_inc(&conn
->sess
->cmd_pdus
);
840 hdr
= (struct iscsi_scsi_req
*) buf
;
841 payload_length
= ntoh24(hdr
->dlength
);
843 /* FIXME; Add checks for AdditionalHeaderSegment */
845 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
846 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
847 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
848 " not set. Bad iSCSI Initiator.\n");
849 return iscsit_add_reject_cmd(cmd
,
850 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
853 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
854 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
856 * From RFC-3720 Section 10.3.1:
858 * "Either or both of R and W MAY be 1 when either the
859 * Expected Data Transfer Length and/or Bidirectional Read
860 * Expected Data Transfer Length are 0"
862 * For this case, go ahead and clear the unnecssary bits
863 * to avoid any confusion with ->data_direction.
865 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
866 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
868 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
869 " set when Expected Data Transfer Length is 0 for"
870 " CDB: 0x%02x, Fixing up flags\n", hdr
->cdb
[0]);
873 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
874 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
876 " MUST be set if Expected Data Transfer Length is not 0."
877 " Bad iSCSI Initiator\n");
878 return iscsit_add_reject_cmd(cmd
,
879 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
882 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
883 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
884 pr_err("Bidirectional operations not supported!\n");
885 return iscsit_add_reject_cmd(cmd
,
886 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
889 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
890 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
891 " Scsi Command PDU.\n");
892 return iscsit_add_reject_cmd(cmd
,
893 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
896 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
897 pr_err("ImmediateData=No but DataSegmentLength=%u,"
898 " protocol error.\n", payload_length
);
899 return iscsit_add_reject_cmd(cmd
,
900 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
903 if ((be32_to_cpu(hdr
->data_length
) == payload_length
) &&
904 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
905 pr_err("Expected Data Transfer Length and Length of"
906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
907 " bit is not set protocol error\n");
908 return iscsit_add_reject_cmd(cmd
,
909 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
912 if (payload_length
> be32_to_cpu(hdr
->data_length
)) {
913 pr_err("DataSegmentLength: %u is greater than"
914 " EDTL: %u, protocol error.\n", payload_length
,
916 return iscsit_add_reject_cmd(cmd
,
917 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
920 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " MaxXmitDataSegmentLength: %u, protocol error.\n",
923 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
924 return iscsit_add_reject_cmd(cmd
,
925 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
928 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " FirstBurstLength: %u, protocol error.\n",
931 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
932 return iscsit_add_reject_cmd(cmd
,
933 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
936 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
937 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
940 cmd
->data_direction
= data_direction
;
941 iscsi_task_attr
= hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
;
943 * Figure out the SAM Task Attribute for the incoming SCSI CDB
945 if ((iscsi_task_attr
== ISCSI_ATTR_UNTAGGED
) ||
946 (iscsi_task_attr
== ISCSI_ATTR_SIMPLE
))
947 sam_task_attr
= TCM_SIMPLE_TAG
;
948 else if (iscsi_task_attr
== ISCSI_ATTR_ORDERED
)
949 sam_task_attr
= TCM_ORDERED_TAG
;
950 else if (iscsi_task_attr
== ISCSI_ATTR_HEAD_OF_QUEUE
)
951 sam_task_attr
= TCM_HEAD_TAG
;
952 else if (iscsi_task_attr
== ISCSI_ATTR_ACA
)
953 sam_task_attr
= TCM_ACA_TAG
;
955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
956 " TCM_SIMPLE_TAG\n", iscsi_task_attr
);
957 sam_task_attr
= TCM_SIMPLE_TAG
;
960 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
961 cmd
->i_state
= ISTATE_NEW_CMD
;
962 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
963 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
964 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
965 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
966 if (cmd
->unsolicited_data
)
967 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
969 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
970 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
) {
971 spin_lock_bh(&conn
->sess
->ttt_lock
);
972 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
973 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
974 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
975 spin_unlock_bh(&conn
->sess
->ttt_lock
);
976 } else if (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)
977 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
978 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
979 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
980 cmd
->first_burst_len
= payload_length
;
982 if (!conn
->sess
->sess_ops
->RDMAExtensions
&&
983 cmd
->data_direction
== DMA_FROM_DEVICE
) {
984 struct iscsi_datain_req
*dr
;
986 dr
= iscsit_allocate_datain_req();
988 return iscsit_add_reject_cmd(cmd
,
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
991 iscsit_attach_datain_req(cmd
, dr
);
995 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
997 transport_init_se_cmd(&cmd
->se_cmd
, &lio_target_fabric_configfs
->tf_ops
,
998 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
999 cmd
->data_direction
, sam_task_attr
,
1000 cmd
->sense_buffer
+ 2);
1002 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1003 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
1004 hdr
->cmdsn
, be32_to_cpu(hdr
->data_length
), payload_length
,
1007 target_get_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
, true);
1009 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
1010 scsilun_to_int(&hdr
->lun
));
1011 if (cmd
->sense_reason
)
1014 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
1015 if (cmd
->sense_reason
) {
1016 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
1017 return iscsit_add_reject_cmd(cmd
,
1018 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1024 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
1025 return iscsit_add_reject_cmd(cmd
,
1026 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1030 spin_lock_bh(&conn
->cmd_lock
);
1031 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1032 spin_unlock_bh(&conn
->cmd_lock
);
1034 * Check if we need to delay processing because of ALUA
1035 * Active/NonOptimized primary access state..
1037 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1041 EXPORT_SYMBOL(iscsit_setup_scsi_cmd
);
1043 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd
*cmd
)
1045 iscsit_set_dataout_sequence_values(cmd
);
1047 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1048 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1049 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1051 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout
);
1053 int iscsit_process_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1054 struct iscsi_scsi_req
*hdr
)
1058 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1059 * the Immediate Bit is not set, and no Immediate
1062 * A PDU/CmdSN carrying Immediate Data can only
1063 * be processed after the DataCRC has passed.
1064 * If the DataCRC fails, the CmdSN MUST NOT
1065 * be acknowledged. (See below)
1067 if (!cmd
->immediate_data
) {
1068 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1069 (unsigned char *)hdr
, hdr
->cmdsn
);
1070 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1072 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1073 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1078 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1081 * If no Immediate Data is attached, it's OK to return now.
1083 if (!cmd
->immediate_data
) {
1084 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
)
1085 iscsit_set_unsoliticed_dataout(cmd
);
1086 if (!cmd
->sense_reason
)
1089 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1094 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1095 * execution. These exceptions are processed in CmdSN order using
1096 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1098 if (cmd
->sense_reason
) {
1099 if (cmd
->reject_reason
)
1105 * Call directly into transport_generic_new_cmd() to perform
1106 * the backend memory allocation.
1108 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1109 if (cmd
->sense_reason
)
1114 EXPORT_SYMBOL(iscsit_process_scsi_cmd
);
1117 iscsit_get_immediate_data(struct iscsi_cmd
*cmd
, struct iscsi_scsi_req
*hdr
,
1120 struct iscsi_conn
*conn
= cmd
->conn
;
1121 int cmdsn_ret
= 0, immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1123 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1126 goto after_immediate_data
;
1128 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1129 cmd
->first_burst_len
);
1130 after_immediate_data
:
1131 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1133 * A PDU/CmdSN carrying Immediate Data passed
1134 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1135 * Immediate Bit is not set.
1137 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1138 (unsigned char *)hdr
, hdr
->cmdsn
);
1139 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1142 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1145 rc
= iscsit_dump_data_payload(cmd
->conn
,
1146 cmd
->first_burst_len
, 1);
1147 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1149 } else if (cmd
->unsolicited_data
)
1150 iscsit_set_unsoliticed_dataout(cmd
);
1152 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1154 * Immediate Data failed DataCRC and ERL>=1,
1155 * silently drop this PDU and let the initiator
1156 * plug the CmdSN gap.
1158 * FIXME: Send Unsolicited NOPIN with reserved
1159 * TTT here to help the initiator figure out
1160 * the missing CmdSN, although they should be
1161 * intelligent enough to determine the missing
1162 * CmdSN and issue a retry to plug the sequence.
1164 cmd
->i_state
= ISTATE_REMOVE
;
1165 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1166 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1173 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1176 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1178 bool dump_payload
= false;
1180 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1184 * Allocation iovecs needed for struct socket operations for
1185 * traditional iSCSI block I/O.
1187 if (iscsit_allocate_iovecs(cmd
) < 0) {
1188 return iscsit_add_reject_cmd(cmd
,
1189 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1191 immed_data
= cmd
->immediate_data
;
1193 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1197 dump_payload
= true;
1202 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1205 static u32
iscsit_do_crypto_hash_sg(
1206 struct hash_desc
*hash
,
1207 struct iscsi_cmd
*cmd
,
1215 struct scatterlist
*sg
;
1216 unsigned int page_off
;
1218 crypto_hash_init(hash
);
1220 sg
= cmd
->first_data_sg
;
1221 page_off
= cmd
->first_data_sg_off
;
1224 while (data_length
) {
1225 u32 cur_len
= min_t(u32
, data_length
, (sg
[i
].length
- page_off
));
1227 crypto_hash_update(hash
, &sg
[i
], cur_len
);
1229 data_length
-= cur_len
;
1235 struct scatterlist pad_sg
;
1237 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1238 crypto_hash_update(hash
, &pad_sg
, padding
);
1240 crypto_hash_final(hash
, (u8
*) &data_crc
);
1245 static void iscsit_do_crypto_hash_buf(
1246 struct hash_desc
*hash
,
1253 struct scatterlist sg
;
1255 crypto_hash_init(hash
);
1257 sg_init_one(&sg
, buf
, payload_length
);
1258 crypto_hash_update(hash
, &sg
, payload_length
);
1261 sg_init_one(&sg
, pad_bytes
, padding
);
1262 crypto_hash_update(hash
, &sg
, padding
);
1264 crypto_hash_final(hash
, data_crc
);
1268 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, unsigned char *buf
,
1269 struct iscsi_cmd
**out_cmd
)
1271 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1272 struct iscsi_cmd
*cmd
= NULL
;
1273 struct se_cmd
*se_cmd
;
1274 u32 payload_length
= ntoh24(hdr
->dlength
);
1277 if (!payload_length
) {
1278 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1283 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1285 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1286 pr_err("DataSegmentLength: %u is greater than"
1287 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1288 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1289 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1293 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
,
1298 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1299 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1300 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1301 payload_length
, conn
->cid
);
1303 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1304 pr_err("Command ITT: 0x%08x received DataOUT after"
1305 " last DataOUT received, dumping payload\n",
1306 cmd
->init_task_tag
);
1307 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1310 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1311 pr_err("Command ITT: 0x%08x received DataOUT for a"
1312 " NON-WRITE command.\n", cmd
->init_task_tag
);
1313 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1315 se_cmd
= &cmd
->se_cmd
;
1316 iscsit_mod_dataout_timer(cmd
);
1318 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1319 pr_err("DataOut Offset: %u, Length %u greater than"
1320 " iSCSI Command EDTL %u, protocol error.\n",
1321 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1322 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1325 if (cmd
->unsolicited_data
) {
1326 int dump_unsolicited_data
= 0;
1328 if (conn
->sess
->sess_ops
->InitialR2T
) {
1329 pr_err("Received unexpected unsolicited data"
1330 " while InitialR2T=Yes, protocol error.\n");
1331 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1332 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1336 * Special case for dealing with Unsolicited DataOUT
1337 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1341 /* Something's amiss if we're not in WRITE_PENDING state... */
1342 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1343 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1344 dump_unsolicited_data
= 1;
1346 if (dump_unsolicited_data
) {
1348 * Check if a delayed TASK_ABORTED status needs to
1349 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1350 * received with the unsolicitied data out.
1352 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1353 iscsit_stop_dataout_timer(cmd
);
1355 transport_check_aborted_status(se_cmd
,
1356 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1357 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1361 * For the normal solicited data path:
1363 * Check for a delayed TASK_ABORTED status and dump any
1364 * incoming data out payload if one exists. Also, when the
1365 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1366 * data out sequence, we decrement outstanding_r2ts. Once
1367 * outstanding_r2ts reaches zero, go ahead and send the delayed
1368 * TASK_ABORTED status.
1370 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1371 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1372 if (--cmd
->outstanding_r2ts
< 1) {
1373 iscsit_stop_dataout_timer(cmd
);
1374 transport_check_aborted_status(
1378 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1382 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1383 * within-command recovery checks before receiving the payload.
1385 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1386 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1388 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1394 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1397 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1398 struct iscsi_data
*hdr
)
1401 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1402 u32 payload_length
= ntoh24(hdr
->dlength
);
1403 int iov_ret
, data_crc_failed
= 0;
1405 rx_size
+= payload_length
;
1406 iov
= &cmd
->iov_data
[0];
1408 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1413 iov_count
+= iov_ret
;
1415 padding
= ((-payload_length
) & 3);
1417 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1418 iov
[iov_count
++].iov_len
= padding
;
1420 pr_debug("Receiving %u padding bytes.\n", padding
);
1423 if (conn
->conn_ops
->DataDigest
) {
1424 iov
[iov_count
].iov_base
= &checksum
;
1425 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1426 rx_size
+= ISCSI_CRC_LEN
;
1429 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1431 iscsit_unmap_iovec(cmd
);
1433 if (rx_got
!= rx_size
)
1436 if (conn
->conn_ops
->DataDigest
) {
1439 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
1440 be32_to_cpu(hdr
->offset
),
1441 payload_length
, padding
,
1444 if (checksum
!= data_crc
) {
1445 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1446 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1447 " does not match computed 0x%08x\n",
1448 hdr
->itt
, hdr
->offset
, payload_length
,
1449 hdr
->datasn
, checksum
, data_crc
);
1450 data_crc_failed
= 1;
1452 pr_debug("Got CRC32C DataDigest 0x%08x for"
1453 " %u bytes of Data Out\n", checksum
,
1458 return data_crc_failed
;
1462 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1463 bool data_crc_failed
)
1465 struct iscsi_conn
*conn
= cmd
->conn
;
1468 * Increment post receive data and CRC values or perform
1469 * within-command recovery.
1471 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1472 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1474 else if (rc
== DATAOUT_SEND_R2T
) {
1475 iscsit_set_dataout_sequence_values(cmd
);
1476 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1477 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1479 * Handle extra special case for out of order
1480 * Unsolicited Data Out.
1482 spin_lock_bh(&cmd
->istate_lock
);
1483 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1484 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1485 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1486 spin_unlock_bh(&cmd
->istate_lock
);
1488 iscsit_stop_dataout_timer(cmd
);
1491 target_execute_cmd(&cmd
->se_cmd
);
1493 } else /* DATAOUT_CANNOT_RECOVER */
1498 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1500 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1502 struct iscsi_cmd
*cmd
= NULL
;
1503 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1505 bool data_crc_failed
= false;
1507 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1513 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1517 data_crc_failed
= true;
1519 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1522 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1523 struct iscsi_nopout
*hdr
)
1525 u32 payload_length
= ntoh24(hdr
->dlength
);
1527 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1528 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1530 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1531 (unsigned char *)hdr
);
1533 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1534 (unsigned char *)hdr
);
1537 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1538 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1539 " not set, protocol error.\n");
1541 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1542 (unsigned char *)hdr
);
1544 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1545 (unsigned char *)hdr
);
1548 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1549 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1550 " greater than MaxXmitDataSegmentLength: %u, protocol"
1551 " error.\n", payload_length
,
1552 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1554 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1555 (unsigned char *)hdr
);
1557 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1558 (unsigned char *)hdr
);
1561 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1562 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1563 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1564 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1567 * This is not a response to a Unsolicited NopIN, which means
1568 * it can either be a NOPOUT ping request (with a valid ITT),
1569 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1570 * Either way, make sure we allocate an struct iscsi_cmd, as both
1571 * can contain ping data.
1573 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1574 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1575 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1576 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1578 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1579 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1580 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1581 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1582 cmd
->data_direction
= DMA_NONE
;
1587 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1589 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1590 struct iscsi_nopout
*hdr
)
1592 struct iscsi_cmd
*cmd_p
= NULL
;
1595 * Initiator is expecting a NopIN ping reply..
1597 if (hdr
->itt
!= RESERVED_ITT
) {
1599 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1600 (unsigned char *)hdr
);
1602 spin_lock_bh(&conn
->cmd_lock
);
1603 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1604 spin_unlock_bh(&conn
->cmd_lock
);
1606 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1608 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1609 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1614 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1615 (unsigned char *)hdr
, hdr
->cmdsn
);
1616 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1618 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1624 * This was a response to a unsolicited NOPIN ping.
1626 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1627 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1631 iscsit_stop_nopin_response_timer(conn
);
1633 cmd_p
->i_state
= ISTATE_REMOVE
;
1634 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1636 iscsit_start_nopin_timer(conn
);
1640 * Otherwise, initiator is not expecting a NOPIN is response.
1641 * Just ignore for now.
1645 EXPORT_SYMBOL(iscsit_process_nop_out
);
1647 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1650 unsigned char *ping_data
= NULL
;
1651 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1652 struct kvec
*iov
= NULL
;
1653 u32 payload_length
= ntoh24(hdr
->dlength
);
1656 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1660 * Handle NOP-OUT payload for traditional iSCSI sockets
1662 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1663 u32 checksum
, data_crc
, padding
= 0;
1664 int niov
= 0, rx_got
, rx_size
= payload_length
;
1666 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1668 pr_err("Unable to allocate memory for"
1669 " NOPOUT ping data.\n");
1674 iov
= &cmd
->iov_misc
[0];
1675 iov
[niov
].iov_base
= ping_data
;
1676 iov
[niov
++].iov_len
= payload_length
;
1678 padding
= ((-payload_length
) & 3);
1680 pr_debug("Receiving %u additional bytes"
1681 " for padding.\n", padding
);
1682 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1683 iov
[niov
++].iov_len
= padding
;
1686 if (conn
->conn_ops
->DataDigest
) {
1687 iov
[niov
].iov_base
= &checksum
;
1688 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1689 rx_size
+= ISCSI_CRC_LEN
;
1692 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1693 if (rx_got
!= rx_size
) {
1698 if (conn
->conn_ops
->DataDigest
) {
1699 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1700 ping_data
, payload_length
,
1701 padding
, cmd
->pad_bytes
,
1704 if (checksum
!= data_crc
) {
1705 pr_err("Ping data CRC32C DataDigest"
1706 " 0x%08x does not match computed 0x%08x\n",
1707 checksum
, data_crc
);
1708 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1709 pr_err("Unable to recover from"
1710 " NOPOUT Ping DataCRC failure while in"
1716 * Silently drop this PDU and let the
1717 * initiator plug the CmdSN gap.
1719 pr_debug("Dropping NOPOUT"
1720 " Command CmdSN: 0x%08x due to"
1721 " DataCRC error.\n", hdr
->cmdsn
);
1726 pr_debug("Got CRC32C DataDigest"
1727 " 0x%08x for %u bytes of ping data.\n",
1728 checksum
, payload_length
);
1732 ping_data
[payload_length
] = '\0';
1734 * Attach ping data to struct iscsi_cmd->buf_ptr.
1736 cmd
->buf_ptr
= ping_data
;
1737 cmd
->buf_ptr_size
= payload_length
;
1739 pr_debug("Got %u bytes of NOPOUT ping"
1740 " data.\n", payload_length
);
1741 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1744 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1747 iscsit_free_cmd(cmd
, false);
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1757 struct se_tmr_req
*se_tmr
;
1758 struct iscsi_tmr_req
*tmr_req
;
1759 struct iscsi_tm
*hdr
;
1760 int out_of_order_cmdsn
= 0, ret
;
1761 bool sess_ref
= false;
1764 hdr
= (struct iscsi_tm
*) buf
;
1765 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1766 function
= hdr
->flags
;
1768 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1769 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1770 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1771 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1773 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1774 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1775 hdr
->rtt
!= RESERVED_ITT
)) {
1776 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1777 hdr
->rtt
= RESERVED_ITT
;
1780 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1781 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1782 pr_err("Task Management Request TASK_REASSIGN not"
1783 " issued as immediate command, bad iSCSI Initiator"
1784 "implementation\n");
1785 return iscsit_add_reject_cmd(cmd
,
1786 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1788 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1789 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1790 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1792 cmd
->data_direction
= DMA_NONE
;
1794 cmd
->tmr_req
= kzalloc(sizeof(struct iscsi_tmr_req
), GFP_KERNEL
);
1795 if (!cmd
->tmr_req
) {
1796 pr_err("Unable to allocate memory for"
1797 " Task Management command!\n");
1798 return iscsit_add_reject_cmd(cmd
,
1799 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1804 * TASK_REASSIGN for ERL=2 / connection stays inside of
1805 * LIO-Target $FABRIC_MOD
1807 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1812 transport_init_se_cmd(&cmd
->se_cmd
,
1813 &lio_target_fabric_configfs
->tf_ops
,
1814 conn
->sess
->se_sess
, 0, DMA_NONE
,
1815 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
1817 target_get_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
, true);
1821 case ISCSI_TM_FUNC_ABORT_TASK
:
1822 tcm_function
= TMR_ABORT_TASK
;
1824 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1825 tcm_function
= TMR_ABORT_TASK_SET
;
1827 case ISCSI_TM_FUNC_CLEAR_ACA
:
1828 tcm_function
= TMR_CLEAR_ACA
;
1830 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1831 tcm_function
= TMR_CLEAR_TASK_SET
;
1833 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1834 tcm_function
= TMR_LUN_RESET
;
1836 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1837 tcm_function
= TMR_TARGET_WARM_RESET
;
1839 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1840 tcm_function
= TMR_TARGET_COLD_RESET
;
1843 pr_err("Unknown iSCSI TMR Function:"
1844 " 0x%02x\n", function
);
1845 return iscsit_add_reject_cmd(cmd
,
1846 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1849 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
,
1850 tcm_function
, GFP_KERNEL
);
1852 return iscsit_add_reject_cmd(cmd
,
1853 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1855 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
1858 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
1859 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
1860 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1861 cmd
->init_task_tag
= hdr
->itt
;
1862 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1863 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1864 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1865 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
1866 tmr_req
= cmd
->tmr_req
;
1868 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1870 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1871 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
1872 scsilun_to_int(&hdr
->lun
));
1874 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
1880 case ISCSI_TM_FUNC_ABORT_TASK
:
1881 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
1882 if (se_tmr
->response
)
1885 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1886 case ISCSI_TM_FUNC_CLEAR_ACA
:
1887 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1888 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1890 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1891 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
1892 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1896 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1897 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
1898 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1902 case ISCSI_TM_FUNC_TASK_REASSIGN
:
1903 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
1905 * Perform sanity checks on the ExpDataSN only if the
1906 * TASK_REASSIGN was successful.
1908 if (se_tmr
->response
)
1911 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
1912 return iscsit_add_reject_cmd(cmd
,
1913 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1916 pr_err("Unknown TMR function: 0x%02x, protocol"
1917 " error.\n", function
);
1918 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
1922 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1923 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
1924 se_tmr
->call_transport
= 1;
1926 spin_lock_bh(&conn
->cmd_lock
);
1927 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1928 spin_unlock_bh(&conn
->cmd_lock
);
1930 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1931 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
1932 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
1933 out_of_order_cmdsn
= 1;
1934 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1936 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1939 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1941 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
1944 * Found the referenced task, send to transport for processing.
1946 if (se_tmr
->call_transport
)
1947 return transport_generic_handle_tmr(&cmd
->se_cmd
);
1950 * Could not find the referenced LUN, task, or Task Management
1951 * command not authorized or supported. Change state and
1952 * let the tx_thread send the response.
1954 * For connection recovery, this is also the default action for
1955 * TMR TASK_REASSIGN.
1958 pr_debug("Handle TMR, using sess_ref=true check\n");
1959 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1962 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
1965 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
1967 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1969 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1970 struct iscsi_text
*hdr
)
1972 u32 payload_length
= ntoh24(hdr
->dlength
);
1974 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1975 pr_err("Unable to accept text parameter length: %u"
1976 "greater than MaxXmitDataSegmentLength %u.\n",
1977 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1978 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1979 (unsigned char *)hdr
);
1982 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
1983 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
1984 pr_err("Multi sequence text commands currently not supported\n");
1985 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
1986 (unsigned char *)hdr
);
1989 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1990 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
1991 hdr
->exp_statsn
, payload_length
);
1993 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
1994 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
1995 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1996 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1997 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1998 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1999 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2000 cmd
->data_direction
= DMA_NONE
;
2004 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2007 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2008 struct iscsi_text
*hdr
)
2010 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2014 pr_err("Unable to locate text_in buffer for sendtargets"
2018 if (strncmp("SendTargets", text_in
, 11) != 0) {
2019 pr_err("Received Text Data that is not"
2020 " SendTargets, cannot continue.\n");
2023 text_ptr
= strchr(text_in
, '=');
2025 pr_err("No \"=\" separator found in Text Data,"
2026 " cannot continue.\n");
2029 if (!strncmp("=All", text_ptr
, 4)) {
2030 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2031 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2032 !strncmp("=eui.", text_ptr
, 5)) {
2033 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2035 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2039 spin_lock_bh(&conn
->cmd_lock
);
2040 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2041 spin_unlock_bh(&conn
->cmd_lock
);
2043 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2045 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2046 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2047 (unsigned char *)hdr
, hdr
->cmdsn
);
2048 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2054 return iscsit_execute_cmd(cmd
, 0);
2057 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2058 (unsigned char *)hdr
);
2060 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2063 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2066 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2067 char *text_in
= NULL
;
2068 u32 payload_length
= ntoh24(hdr
->dlength
);
2071 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2075 rx_size
= payload_length
;
2076 if (payload_length
) {
2077 u32 checksum
= 0, data_crc
= 0;
2078 u32 padding
= 0, pad_bytes
= 0;
2079 int niov
= 0, rx_got
;
2082 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2084 pr_err("Unable to allocate memory for"
2085 " incoming text parameters\n");
2088 cmd
->text_in_ptr
= text_in
;
2090 memset(iov
, 0, 3 * sizeof(struct kvec
));
2091 iov
[niov
].iov_base
= text_in
;
2092 iov
[niov
++].iov_len
= payload_length
;
2094 padding
= ((-payload_length
) & 3);
2096 iov
[niov
].iov_base
= &pad_bytes
;
2097 iov
[niov
++].iov_len
= padding
;
2099 pr_debug("Receiving %u additional bytes"
2100 " for padding.\n", padding
);
2102 if (conn
->conn_ops
->DataDigest
) {
2103 iov
[niov
].iov_base
= &checksum
;
2104 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2105 rx_size
+= ISCSI_CRC_LEN
;
2108 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2109 if (rx_got
!= rx_size
)
2112 if (conn
->conn_ops
->DataDigest
) {
2113 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
2114 text_in
, payload_length
,
2115 padding
, (u8
*)&pad_bytes
,
2118 if (checksum
!= data_crc
) {
2119 pr_err("Text data CRC32C DataDigest"
2120 " 0x%08x does not match computed"
2121 " 0x%08x\n", checksum
, data_crc
);
2122 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2123 pr_err("Unable to recover from"
2124 " Text Data digest failure while in"
2129 * Silently drop this PDU and let the
2130 * initiator plug the CmdSN gap.
2132 pr_debug("Dropping Text"
2133 " Command CmdSN: 0x%08x due to"
2134 " DataCRC error.\n", hdr
->cmdsn
);
2139 pr_debug("Got CRC32C DataDigest"
2140 " 0x%08x for %u bytes of text data.\n",
2141 checksum
, payload_length
);
2144 text_in
[payload_length
- 1] = '\0';
2145 pr_debug("Successfully read %d bytes of text"
2146 " data.\n", payload_length
);
2149 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2152 kfree(cmd
->text_in_ptr
);
2153 cmd
->text_in_ptr
= NULL
;
2154 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2156 EXPORT_SYMBOL(iscsit_handle_text_cmd
);
2158 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2160 struct iscsi_conn
*conn_p
;
2161 struct iscsi_session
*sess
= conn
->sess
;
2163 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2164 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2166 atomic_set(&sess
->session_logout
, 1);
2167 atomic_set(&conn
->conn_logout_remove
, 1);
2168 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2170 iscsit_inc_conn_usage_count(conn
);
2171 iscsit_inc_session_usage_count(sess
);
2173 spin_lock_bh(&sess
->conn_lock
);
2174 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2175 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2178 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2179 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2181 spin_unlock_bh(&sess
->conn_lock
);
2183 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2188 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2190 struct iscsi_conn
*l_conn
;
2191 struct iscsi_session
*sess
= conn
->sess
;
2193 pr_debug("Received logout request CLOSECONNECTION for CID:"
2194 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2197 * A Logout Request with a CLOSECONNECTION reason code for a CID
2198 * can arrive on a connection with a differing CID.
2200 if (conn
->cid
== cmd
->logout_cid
) {
2201 spin_lock_bh(&conn
->state_lock
);
2202 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2203 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2205 atomic_set(&conn
->conn_logout_remove
, 1);
2206 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2207 iscsit_inc_conn_usage_count(conn
);
2209 spin_unlock_bh(&conn
->state_lock
);
2212 * Handle all different cid CLOSECONNECTION requests in
2213 * iscsit_logout_post_handler_diffcid() as to give enough
2214 * time for any non immediate command's CmdSN to be
2215 * acknowledged on the connection in question.
2217 * Here we simply make sure the CID is still around.
2219 l_conn
= iscsit_get_conn_from_cid(sess
,
2222 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2223 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2228 iscsit_dec_conn_usage_count(l_conn
);
2231 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2236 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2238 struct iscsi_session
*sess
= conn
->sess
;
2240 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2241 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2243 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2244 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2245 " while ERL!=2.\n");
2246 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2247 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2251 if (conn
->cid
== cmd
->logout_cid
) {
2252 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2253 " with CID: %hu on CID: %hu, implementation error.\n",
2254 cmd
->logout_cid
, conn
->cid
);
2255 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2256 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2260 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2266 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2269 int cmdsn_ret
, logout_remove
= 0;
2271 struct iscsi_logout
*hdr
;
2272 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2274 hdr
= (struct iscsi_logout
*) buf
;
2275 reason_code
= (hdr
->flags
& 0x7f);
2278 spin_lock(&tiqn
->logout_stats
.lock
);
2279 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2280 tiqn
->logout_stats
.normal_logouts
++;
2282 tiqn
->logout_stats
.abnormal_logouts
++;
2283 spin_unlock(&tiqn
->logout_stats
.lock
);
2286 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2287 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2288 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2289 hdr
->cid
, conn
->cid
);
2291 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2292 pr_err("Received logout request on connection that"
2293 " is not in logged in state, ignoring request.\n");
2294 iscsit_free_cmd(cmd
, false);
2298 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2299 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2300 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2301 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2302 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2303 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2304 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2305 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2306 cmd
->logout_reason
= reason_code
;
2307 cmd
->data_direction
= DMA_NONE
;
2310 * We need to sleep in these cases (by returning 1) until the Logout
2311 * Response gets sent in the tx thread.
2313 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2314 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2315 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2318 spin_lock_bh(&conn
->cmd_lock
);
2319 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2320 spin_unlock_bh(&conn
->cmd_lock
);
2322 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2323 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2326 * Immediate commands are executed, well, immediately.
2327 * Non-Immediate Logout Commands are executed in CmdSN order.
2329 if (cmd
->immediate_cmd
) {
2330 int ret
= iscsit_execute_cmd(cmd
, 0);
2335 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2336 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2338 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2342 return logout_remove
;
2344 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2346 static int iscsit_handle_snack(
2347 struct iscsi_conn
*conn
,
2350 struct iscsi_snack
*hdr
;
2352 hdr
= (struct iscsi_snack
*) buf
;
2353 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2355 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2356 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2357 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2358 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2360 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2361 pr_err("Initiator sent SNACK request while in"
2362 " ErrorRecoveryLevel=0.\n");
2363 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2367 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2368 * call from inside iscsi_send_recovery_datain_or_r2t().
2370 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2372 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2374 be32_to_cpu(hdr
->ttt
),
2375 be32_to_cpu(hdr
->begrun
),
2376 be32_to_cpu(hdr
->runlength
));
2377 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2378 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2379 be32_to_cpu(hdr
->ttt
),
2380 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2381 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2382 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2383 be32_to_cpu(hdr
->begrun
),
2384 be32_to_cpu(hdr
->runlength
));
2385 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2386 /* FIXME: Support R-Data SNACK */
2387 pr_err("R-Data SNACK Not Supported.\n");
2388 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2391 pr_err("Unknown SNACK type 0x%02x, protocol"
2392 " error.\n", hdr
->flags
& 0x0f);
2393 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2400 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2402 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2403 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2404 wait_for_completion_interruptible_timeout(
2405 &conn
->rx_half_close_comp
,
2406 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2410 static int iscsit_handle_immediate_data(
2411 struct iscsi_cmd
*cmd
,
2412 struct iscsi_scsi_req
*hdr
,
2415 int iov_ret
, rx_got
= 0, rx_size
= 0;
2416 u32 checksum
, iov_count
= 0, padding
= 0;
2417 struct iscsi_conn
*conn
= cmd
->conn
;
2420 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2422 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2425 iov_count
= iov_ret
;
2426 iov
= &cmd
->iov_data
[0];
2428 padding
= ((-length
) & 3);
2430 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2431 iov
[iov_count
++].iov_len
= padding
;
2435 if (conn
->conn_ops
->DataDigest
) {
2436 iov
[iov_count
].iov_base
= &checksum
;
2437 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2438 rx_size
+= ISCSI_CRC_LEN
;
2441 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2443 iscsit_unmap_iovec(cmd
);
2445 if (rx_got
!= rx_size
) {
2446 iscsit_rx_thread_wait_for_tcp(conn
);
2447 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2450 if (conn
->conn_ops
->DataDigest
) {
2453 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
2454 cmd
->write_data_done
, length
, padding
,
2457 if (checksum
!= data_crc
) {
2458 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2459 " does not match computed 0x%08x\n", checksum
,
2462 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2463 pr_err("Unable to recover from"
2464 " Immediate Data digest failure while"
2466 iscsit_reject_cmd(cmd
,
2467 ISCSI_REASON_DATA_DIGEST_ERROR
,
2468 (unsigned char *)hdr
);
2469 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2471 iscsit_reject_cmd(cmd
,
2472 ISCSI_REASON_DATA_DIGEST_ERROR
,
2473 (unsigned char *)hdr
);
2474 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2477 pr_debug("Got CRC32C DataDigest 0x%08x for"
2478 " %u bytes of Immediate Data\n", checksum
,
2483 cmd
->write_data_done
+= length
;
2485 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2486 spin_lock_bh(&cmd
->istate_lock
);
2487 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2488 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2489 spin_unlock_bh(&cmd
->istate_lock
);
2492 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2496 * Called with sess->conn_lock held.
2498 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2499 with active network interface */
2500 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2502 struct iscsi_cmd
*cmd
;
2503 struct iscsi_conn
*conn_p
;
2507 * Only send a Asynchronous Message on connections whos network
2508 * interface is still functional.
2510 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2511 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2512 iscsit_inc_conn_usage_count(conn_p
);
2521 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2523 iscsit_dec_conn_usage_count(conn_p
);
2527 cmd
->logout_cid
= conn
->cid
;
2528 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2529 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2531 spin_lock_bh(&conn_p
->cmd_lock
);
2532 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2533 spin_unlock_bh(&conn_p
->cmd_lock
);
2535 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2536 iscsit_dec_conn_usage_count(conn_p
);
2539 static int iscsit_send_conn_drop_async_message(
2540 struct iscsi_cmd
*cmd
,
2541 struct iscsi_conn
*conn
)
2543 struct iscsi_async
*hdr
;
2545 cmd
->tx_size
= ISCSI_HDR_LEN
;
2546 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2548 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2549 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2550 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2551 cmd
->init_task_tag
= RESERVED_ITT
;
2552 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2553 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2554 cmd
->stat_sn
= conn
->stat_sn
++;
2555 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2556 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2557 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2558 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2559 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2560 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2561 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2563 if (conn
->conn_ops
->HeaderDigest
) {
2564 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2566 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2567 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2569 cmd
->tx_size
+= ISCSI_CRC_LEN
;
2570 pr_debug("Attaching CRC32C HeaderDigest to"
2571 " Async Message 0x%08x\n", *header_digest
);
2574 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2575 cmd
->iov_misc
[0].iov_len
= cmd
->tx_size
;
2576 cmd
->iov_misc_count
= 1;
2578 pr_debug("Sending Connection Dropped Async Message StatSN:"
2579 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2580 cmd
->logout_cid
, conn
->cid
);
2584 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2586 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2587 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2588 wait_for_completion_interruptible_timeout(
2589 &conn
->tx_half_close_comp
,
2590 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2595 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2596 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2599 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2600 hdr
->flags
= datain
->flags
;
2601 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2602 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2603 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2604 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2605 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2606 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2607 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2610 hton24(hdr
->dlength
, datain
->length
);
2611 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2612 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2613 (struct scsi_lun
*)&hdr
->lun
);
2615 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2617 hdr
->itt
= cmd
->init_task_tag
;
2619 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2620 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2622 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2624 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2626 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2628 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2629 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2630 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2631 hdr
->offset
= cpu_to_be32(datain
->offset
);
2633 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2634 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2635 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2636 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2639 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2641 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2642 struct iscsi_datain datain
;
2643 struct iscsi_datain_req
*dr
;
2645 u32 iov_count
= 0, tx_size
= 0;
2646 int eodr
= 0, ret
, iov_ret
;
2647 bool set_statsn
= false;
2649 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2650 dr
= iscsit_get_datain_values(cmd
, &datain
);
2652 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2653 cmd
->init_task_tag
);
2657 * Be paranoid and double check the logic for now.
2659 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2660 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2661 " datain.length: %u exceeds cmd->data_length: %u\n",
2662 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2663 cmd
->se_cmd
.data_length
);
2667 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2669 * Special case for successfully execution w/ both DATAIN
2672 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2673 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2674 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2676 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2677 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2678 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2679 cmd
->stat_sn
= conn
->stat_sn
++;
2681 } else if (dr
->dr_complete
==
2682 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2686 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2688 iov
= &cmd
->iov_data
[0];
2689 iov
[iov_count
].iov_base
= cmd
->pdu
;
2690 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
2691 tx_size
+= ISCSI_HDR_LEN
;
2693 if (conn
->conn_ops
->HeaderDigest
) {
2694 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2696 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->pdu
,
2697 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2699 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2700 tx_size
+= ISCSI_CRC_LEN
;
2702 pr_debug("Attaching CRC32 HeaderDigest"
2703 " for DataIN PDU 0x%08x\n", *header_digest
);
2706 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1],
2707 datain
.offset
, datain
.length
);
2711 iov_count
+= iov_ret
;
2712 tx_size
+= datain
.length
;
2714 cmd
->padding
= ((-datain
.length
) & 3);
2716 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2717 iov
[iov_count
++].iov_len
= cmd
->padding
;
2718 tx_size
+= cmd
->padding
;
2720 pr_debug("Attaching %u padding bytes\n",
2723 if (conn
->conn_ops
->DataDigest
) {
2724 cmd
->data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_tx_hash
, cmd
,
2725 datain
.offset
, datain
.length
, cmd
->padding
, cmd
->pad_bytes
);
2727 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
2728 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2729 tx_size
+= ISCSI_CRC_LEN
;
2731 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2732 " 0x%08x\n", datain
.length
+cmd
->padding
, cmd
->data_crc
);
2735 cmd
->iov_data_count
= iov_count
;
2736 cmd
->tx_size
= tx_size
;
2738 /* sendpage is preferred but can't insert markers */
2739 if (!conn
->conn_ops
->IFMarker
)
2740 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
2742 ret
= iscsit_send_tx_data(cmd
, conn
, 0);
2744 iscsit_unmap_iovec(cmd
);
2747 iscsit_tx_thread_wait_for_tcp(conn
);
2751 if (dr
->dr_complete
) {
2752 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2754 iscsit_free_datain_req(cmd
, dr
);
2761 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2762 struct iscsi_logout_rsp
*hdr
)
2764 struct iscsi_conn
*logout_conn
= NULL
;
2765 struct iscsi_conn_recovery
*cr
= NULL
;
2766 struct iscsi_session
*sess
= conn
->sess
;
2768 * The actual shutting down of Sessions and/or Connections
2769 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2770 * is done in scsi_logout_post_handler().
2772 switch (cmd
->logout_reason
) {
2773 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2774 pr_debug("iSCSI session logout successful, setting"
2775 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2776 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2778 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2779 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2782 * For CLOSECONNECTION logout requests carrying
2783 * a matching logout CID -> local CID, the reference
2784 * for the local CID will have been incremented in
2785 * iscsi_logout_closeconnection().
2787 * For CLOSECONNECTION logout requests carrying
2788 * a different CID than the connection it arrived
2789 * on, the connection responding to cmd->logout_cid
2790 * is stopped in iscsit_logout_post_handler_diffcid().
2793 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2794 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2795 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2797 case ISCSI_LOGOUT_REASON_RECOVERY
:
2798 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2799 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2802 * If the connection is still active from our point of view
2803 * force connection recovery to occur.
2805 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2808 iscsit_connection_reinstatement_rcfr(logout_conn
);
2809 iscsit_dec_conn_usage_count(logout_conn
);
2812 cr
= iscsit_get_inactive_connection_recovery_entry(
2813 conn
->sess
, cmd
->logout_cid
);
2815 pr_err("Unable to locate CID: %hu for"
2816 " REMOVECONNFORRECOVERY Logout Request.\n",
2818 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2822 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2824 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2825 " for recovery for CID: %hu on CID: %hu successful.\n",
2826 cmd
->logout_cid
, conn
->cid
);
2827 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2830 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2831 cmd
->logout_reason
);
2835 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2836 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2837 hdr
->response
= cmd
->logout_response
;
2838 hdr
->itt
= cmd
->init_task_tag
;
2839 cmd
->stat_sn
= conn
->stat_sn
++;
2840 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2842 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2843 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2844 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2846 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2847 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2848 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2849 cmd
->logout_cid
, conn
->cid
);
2853 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2856 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2859 int niov
= 0, tx_size
, rc
;
2861 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2862 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2866 tx_size
= ISCSI_HDR_LEN
;
2867 iov
= &cmd
->iov_misc
[0];
2868 iov
[niov
].iov_base
= cmd
->pdu
;
2869 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2871 if (conn
->conn_ops
->HeaderDigest
) {
2872 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2874 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, &cmd
->pdu
[0],
2875 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2877 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2878 tx_size
+= ISCSI_CRC_LEN
;
2879 pr_debug("Attaching CRC32C HeaderDigest to"
2880 " Logout Response 0x%08x\n", *header_digest
);
2882 cmd
->iov_misc_count
= niov
;
2883 cmd
->tx_size
= tx_size
;
2889 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2890 struct iscsi_nopin
*hdr
, bool nopout_response
)
2892 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2893 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2894 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2895 if (nopout_response
)
2896 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2897 hdr
->itt
= cmd
->init_task_tag
;
2898 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2899 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2901 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2903 if (nopout_response
)
2904 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2906 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2907 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2909 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2910 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2911 "Solicitied" : "Unsolicitied", cmd
->init_task_tag
,
2912 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2914 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
2917 * Unsolicited NOPIN, either requesting a response or not.
2919 static int iscsit_send_unsolicited_nopin(
2920 struct iscsi_cmd
*cmd
,
2921 struct iscsi_conn
*conn
,
2924 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
2925 int tx_size
= ISCSI_HDR_LEN
, ret
;
2927 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
2929 if (conn
->conn_ops
->HeaderDigest
) {
2930 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2932 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2933 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2935 tx_size
+= ISCSI_CRC_LEN
;
2936 pr_debug("Attaching CRC32C HeaderDigest to"
2937 " NopIN 0x%08x\n", *header_digest
);
2940 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2941 cmd
->iov_misc
[0].iov_len
= tx_size
;
2942 cmd
->iov_misc_count
= 1;
2943 cmd
->tx_size
= tx_size
;
2945 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2946 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
2948 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
2950 iscsit_tx_thread_wait_for_tcp(conn
);
2954 spin_lock_bh(&cmd
->istate_lock
);
2955 cmd
->i_state
= want_response
?
2956 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
2957 spin_unlock_bh(&cmd
->istate_lock
);
2963 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2965 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
2968 int niov
= 0, tx_size
;
2970 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
2972 tx_size
= ISCSI_HDR_LEN
;
2973 iov
= &cmd
->iov_misc
[0];
2974 iov
[niov
].iov_base
= cmd
->pdu
;
2975 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2977 if (conn
->conn_ops
->HeaderDigest
) {
2978 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2980 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2981 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2983 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2984 tx_size
+= ISCSI_CRC_LEN
;
2985 pr_debug("Attaching CRC32C HeaderDigest"
2986 " to NopIn 0x%08x\n", *header_digest
);
2990 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2991 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2993 if (cmd
->buf_ptr_size
) {
2994 iov
[niov
].iov_base
= cmd
->buf_ptr
;
2995 iov
[niov
++].iov_len
= cmd
->buf_ptr_size
;
2996 tx_size
+= cmd
->buf_ptr_size
;
2998 pr_debug("Echoing back %u bytes of ping"
2999 " data.\n", cmd
->buf_ptr_size
);
3001 padding
= ((-cmd
->buf_ptr_size
) & 3);
3003 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
3004 iov
[niov
++].iov_len
= padding
;
3006 pr_debug("Attaching %u additional"
3007 " padding bytes.\n", padding
);
3009 if (conn
->conn_ops
->DataDigest
) {
3010 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3011 cmd
->buf_ptr
, cmd
->buf_ptr_size
,
3012 padding
, (u8
*)&cmd
->pad_bytes
,
3013 (u8
*)&cmd
->data_crc
);
3015 iov
[niov
].iov_base
= &cmd
->data_crc
;
3016 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
3017 tx_size
+= ISCSI_CRC_LEN
;
3018 pr_debug("Attached DataDigest for %u"
3019 " bytes of ping data, CRC 0x%08x\n",
3020 cmd
->buf_ptr_size
, cmd
->data_crc
);
3024 cmd
->iov_misc_count
= niov
;
3025 cmd
->tx_size
= tx_size
;
3030 static int iscsit_send_r2t(
3031 struct iscsi_cmd
*cmd
,
3032 struct iscsi_conn
*conn
)
3035 struct iscsi_r2t
*r2t
;
3036 struct iscsi_r2t_rsp
*hdr
;
3039 r2t
= iscsit_get_r2t_from_list(cmd
);
3043 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3044 memset(hdr
, 0, ISCSI_HDR_LEN
);
3045 hdr
->opcode
= ISCSI_OP_R2T
;
3046 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3047 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3048 (struct scsi_lun
*)&hdr
->lun
);
3049 hdr
->itt
= cmd
->init_task_tag
;
3050 spin_lock_bh(&conn
->sess
->ttt_lock
);
3051 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
3052 if (r2t
->targ_xfer_tag
== 0xFFFFFFFF)
3053 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
3054 spin_unlock_bh(&conn
->sess
->ttt_lock
);
3055 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3056 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3057 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3058 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3059 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3060 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3061 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3063 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3064 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3065 tx_size
+= ISCSI_HDR_LEN
;
3067 if (conn
->conn_ops
->HeaderDigest
) {
3068 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3070 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3071 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3073 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3074 tx_size
+= ISCSI_CRC_LEN
;
3075 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3076 " PDU 0x%08x\n", *header_digest
);
3079 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3080 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3081 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3082 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3083 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3085 cmd
->iov_misc_count
= 1;
3086 cmd
->tx_size
= tx_size
;
3088 spin_lock_bh(&cmd
->r2t_lock
);
3090 spin_unlock_bh(&cmd
->r2t_lock
);
3092 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
3094 iscsit_tx_thread_wait_for_tcp(conn
);
3098 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3099 iscsit_start_dataout_timer(cmd
, conn
);
3100 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3106 * @recovery: If called from iscsi_task_reassign_complete_write() for
3107 * connection recovery.
3109 int iscsit_build_r2ts_for_cmd(
3110 struct iscsi_conn
*conn
,
3111 struct iscsi_cmd
*cmd
,
3115 u32 offset
= 0, xfer_len
= 0;
3117 spin_lock_bh(&cmd
->r2t_lock
);
3118 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3119 spin_unlock_bh(&cmd
->r2t_lock
);
3123 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3125 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3127 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3128 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3129 offset
= cmd
->r2t_offset
;
3131 if (first_r2t
&& recovery
) {
3132 int new_data_end
= offset
+
3133 conn
->sess
->sess_ops
->MaxBurstLength
-
3134 cmd
->next_burst_len
;
3136 if (new_data_end
> cmd
->se_cmd
.data_length
)
3137 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3140 conn
->sess
->sess_ops
->MaxBurstLength
-
3141 cmd
->next_burst_len
;
3143 int new_data_end
= offset
+
3144 conn
->sess
->sess_ops
->MaxBurstLength
;
3146 if (new_data_end
> cmd
->se_cmd
.data_length
)
3147 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3149 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3151 cmd
->r2t_offset
+= xfer_len
;
3153 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3154 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3156 struct iscsi_seq
*seq
;
3158 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3160 spin_unlock_bh(&cmd
->r2t_lock
);
3164 offset
= seq
->offset
;
3165 xfer_len
= seq
->xfer_len
;
3167 if (cmd
->seq_send_order
== cmd
->seq_count
)
3168 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3170 cmd
->outstanding_r2ts
++;
3173 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3174 spin_unlock_bh(&cmd
->r2t_lock
);
3178 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3181 spin_unlock_bh(&cmd
->r2t_lock
);
3186 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3187 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3190 cmd
->stat_sn
= conn
->stat_sn
++;
3192 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3194 memset(hdr
, 0, ISCSI_HDR_LEN
);
3195 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3196 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3197 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3198 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3199 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3200 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3201 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3202 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3204 hdr
->response
= cmd
->iscsi_response
;
3205 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3206 hdr
->itt
= cmd
->init_task_tag
;
3207 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3209 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3210 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3211 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3213 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3214 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3215 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3216 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3218 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3220 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3222 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3224 u32 padding
= 0, tx_size
= 0;
3226 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3228 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3230 iov
= &cmd
->iov_misc
[0];
3231 iov
[iov_count
].iov_base
= cmd
->pdu
;
3232 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3233 tx_size
+= ISCSI_HDR_LEN
;
3236 * Attach SENSE DATA payload to iSCSI Response PDU
3238 if (cmd
->se_cmd
.sense_buffer
&&
3239 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3240 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3241 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3242 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3244 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3245 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3246 iov
[iov_count
].iov_base
= cmd
->sense_buffer
;
3247 iov
[iov_count
++].iov_len
=
3248 (cmd
->se_cmd
.scsi_sense_length
+ padding
);
3249 tx_size
+= cmd
->se_cmd
.scsi_sense_length
;
3252 memset(cmd
->sense_buffer
+
3253 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3255 pr_debug("Adding %u bytes of padding to"
3256 " SENSE.\n", padding
);
3259 if (conn
->conn_ops
->DataDigest
) {
3260 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3262 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3263 0, NULL
, (u8
*)&cmd
->data_crc
);
3265 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3266 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3267 tx_size
+= ISCSI_CRC_LEN
;
3269 pr_debug("Attaching CRC32 DataDigest for"
3270 " SENSE, %u bytes CRC 0x%08x\n",
3271 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3275 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3277 cmd
->se_cmd
.scsi_sense_length
);
3280 if (conn
->conn_ops
->HeaderDigest
) {
3281 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3283 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->pdu
,
3284 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3286 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3287 tx_size
+= ISCSI_CRC_LEN
;
3288 pr_debug("Attaching CRC32 HeaderDigest for Response"
3289 " PDU 0x%08x\n", *header_digest
);
3292 cmd
->iov_misc_count
= iov_count
;
3293 cmd
->tx_size
= tx_size
;
3298 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3300 switch (se_tmr
->response
) {
3301 case TMR_FUNCTION_COMPLETE
:
3302 return ISCSI_TMF_RSP_COMPLETE
;
3303 case TMR_TASK_DOES_NOT_EXIST
:
3304 return ISCSI_TMF_RSP_NO_TASK
;
3305 case TMR_LUN_DOES_NOT_EXIST
:
3306 return ISCSI_TMF_RSP_NO_LUN
;
3307 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3308 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3309 case TMR_FUNCTION_REJECTED
:
3311 return ISCSI_TMF_RSP_REJECTED
;
3316 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3317 struct iscsi_tm_rsp
*hdr
)
3319 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3321 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3322 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3323 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3324 hdr
->itt
= cmd
->init_task_tag
;
3325 cmd
->stat_sn
= conn
->stat_sn
++;
3326 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3328 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3329 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3330 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3332 pr_debug("Built Task Management Response ITT: 0x%08x,"
3333 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3334 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3336 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3339 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3341 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3344 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3346 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3347 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3348 tx_size
+= ISCSI_HDR_LEN
;
3350 if (conn
->conn_ops
->HeaderDigest
) {
3351 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3353 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3354 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3356 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3357 tx_size
+= ISCSI_CRC_LEN
;
3358 pr_debug("Attaching CRC32 HeaderDigest for Task"
3359 " Mgmt Response PDU 0x%08x\n", *header_digest
);
3362 cmd
->iov_misc_count
= 1;
3363 cmd
->tx_size
= tx_size
;
3368 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3372 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3373 const struct sockaddr_in6 sin6
= {
3374 .sin6_addr
= IN6ADDR_ANY_INIT
};
3375 struct sockaddr_in6
*sock_in6
=
3376 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3378 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3379 sin6
.sin6_addr
.s6_addr
, 16))
3382 struct sockaddr_in
* sock_in
=
3383 (struct sockaddr_in
*)&np
->np_sockaddr
;
3385 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3392 #define SENDTARGETS_BUF_LIMIT 32768U
3395 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3396 enum iscsit_transport_type network_transport
)
3398 char *payload
= NULL
;
3399 struct iscsi_conn
*conn
= cmd
->conn
;
3400 struct iscsi_portal_group
*tpg
;
3401 struct iscsi_tiqn
*tiqn
;
3402 struct iscsi_tpg_np
*tpg_np
;
3403 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3404 int target_name_printed
;
3405 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3406 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3408 buffer_len
= max(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3409 SENDTARGETS_BUF_LIMIT
);
3411 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3413 pr_err("Unable to allocate memory for sendtargets"
3418 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3421 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3422 text_ptr
= strchr(text_in
, '=');
3424 pr_err("Unable to locate '=' string in text_in:"
3430 * Skip over '=' character..
3435 spin_lock(&tiqn_lock
);
3436 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3437 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3438 strcmp(tiqn
->tiqn
, text_ptr
)) {
3442 target_name_printed
= 0;
3444 spin_lock(&tiqn
->tiqn_tpg_lock
);
3445 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3447 /* If demo_mode_discovery=0 and generate_node_acls=0
3448 * (demo mode dislabed) do not return
3449 * TargetName+TargetAddress unless a NodeACL exists.
3452 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3453 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3454 (!core_tpg_get_initiator_node_acl(&tpg
->tpg_se_tpg
,
3455 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3459 spin_lock(&tpg
->tpg_state_lock
);
3460 if ((tpg
->tpg_state
== TPG_STATE_FREE
) ||
3461 (tpg
->tpg_state
== TPG_STATE_INACTIVE
)) {
3462 spin_unlock(&tpg
->tpg_state_lock
);
3465 spin_unlock(&tpg
->tpg_state_lock
);
3467 spin_lock(&tpg
->tpg_np_lock
);
3468 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3470 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3471 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3473 if (np
->np_network_transport
!= network_transport
)
3476 if (!target_name_printed
) {
3477 len
= sprintf(buf
, "TargetName=%s",
3481 if ((len
+ payload_len
) > buffer_len
) {
3482 spin_unlock(&tpg
->tpg_np_lock
);
3483 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3487 memcpy(payload
+ payload_len
, buf
, len
);
3489 target_name_printed
= 1;
3492 len
= sprintf(buf
, "TargetAddress="
3494 inaddr_any
? conn
->local_ip
: np
->np_ip
,
3499 if ((len
+ payload_len
) > buffer_len
) {
3500 spin_unlock(&tpg
->tpg_np_lock
);
3501 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3505 memcpy(payload
+ payload_len
, buf
, len
);
3508 spin_unlock(&tpg
->tpg_np_lock
);
3510 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3515 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3518 spin_unlock(&tiqn_lock
);
3520 cmd
->buf_ptr
= payload
;
3526 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3527 struct iscsi_text_rsp
*hdr
,
3528 enum iscsit_transport_type network_transport
)
3530 int text_length
, padding
;
3532 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
);
3533 if (text_length
< 0)
3536 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3537 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3538 padding
= ((-text_length
) & 3);
3539 hton24(hdr
->dlength
, text_length
);
3540 hdr
->itt
= cmd
->init_task_tag
;
3541 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3542 cmd
->stat_sn
= conn
->stat_sn
++;
3543 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3545 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3546 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3547 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3549 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3550 " Length: %u, CID: %hu\n", cmd
->init_task_tag
, cmd
->stat_sn
,
3551 text_length
, conn
->cid
);
3553 return text_length
+ padding
;
3555 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3558 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3559 * MaxRecvDataSegmentLength.
3561 static int iscsit_send_text_rsp(
3562 struct iscsi_cmd
*cmd
,
3563 struct iscsi_conn
*conn
)
3565 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3568 int text_length
, iov_count
= 0, rc
;
3570 rc
= iscsit_build_text_rsp(cmd
, conn
, hdr
, ISCSI_TCP
);
3575 iov
= &cmd
->iov_misc
[0];
3576 iov
[iov_count
].iov_base
= cmd
->pdu
;
3577 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3578 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3579 iov
[iov_count
++].iov_len
= text_length
;
3581 tx_size
+= (ISCSI_HDR_LEN
+ text_length
);
3583 if (conn
->conn_ops
->HeaderDigest
) {
3584 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3586 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3587 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3589 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3590 tx_size
+= ISCSI_CRC_LEN
;
3591 pr_debug("Attaching CRC32 HeaderDigest for"
3592 " Text Response PDU 0x%08x\n", *header_digest
);
3595 if (conn
->conn_ops
->DataDigest
) {
3596 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3597 cmd
->buf_ptr
, text_length
,
3598 0, NULL
, (u8
*)&cmd
->data_crc
);
3600 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3601 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3602 tx_size
+= ISCSI_CRC_LEN
;
3604 pr_debug("Attaching DataDigest for %u bytes of text"
3605 " data, CRC 0x%08x\n", text_length
,
3609 cmd
->iov_misc_count
= iov_count
;
3610 cmd
->tx_size
= tx_size
;
3616 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3617 struct iscsi_reject
*hdr
)
3619 hdr
->opcode
= ISCSI_OP_REJECT
;
3620 hdr
->reason
= cmd
->reject_reason
;
3621 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3622 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3623 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3624 cmd
->stat_sn
= conn
->stat_sn
++;
3625 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3626 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3627 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3630 EXPORT_SYMBOL(iscsit_build_reject
);
3632 static int iscsit_send_reject(
3633 struct iscsi_cmd
*cmd
,
3634 struct iscsi_conn
*conn
)
3636 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3638 u32 iov_count
= 0, tx_size
;
3640 iscsit_build_reject(cmd
, conn
, hdr
);
3642 iov
= &cmd
->iov_misc
[0];
3643 iov
[iov_count
].iov_base
= cmd
->pdu
;
3644 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3645 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3646 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3648 tx_size
= (ISCSI_HDR_LEN
+ ISCSI_HDR_LEN
);
3650 if (conn
->conn_ops
->HeaderDigest
) {
3651 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3653 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3654 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3656 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3657 tx_size
+= ISCSI_CRC_LEN
;
3658 pr_debug("Attaching CRC32 HeaderDigest for"
3659 " REJECT PDU 0x%08x\n", *header_digest
);
3662 if (conn
->conn_ops
->DataDigest
) {
3663 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->buf_ptr
,
3664 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)&cmd
->data_crc
);
3666 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3667 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3668 tx_size
+= ISCSI_CRC_LEN
;
3669 pr_debug("Attaching CRC32 DataDigest for REJECT"
3670 " PDU 0x%08x\n", cmd
->data_crc
);
3673 cmd
->iov_misc_count
= iov_count
;
3674 cmd
->tx_size
= tx_size
;
3676 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3677 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3682 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3684 struct iscsi_thread_set
*ts
= conn
->thread_set
;
3687 * thread_id is assigned from iscsit_global->ts_bitmap from
3688 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3690 * Here we use thread_id to determine which CPU that this
3691 * iSCSI connection's iscsi_thread_set will be scheduled to
3694 ord
= ts
->thread_id
% cpumask_weight(cpu_online_mask
);
3695 for_each_online_cpu(cpu
) {
3697 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3702 * This should never be reached..
3705 cpumask_setall(conn
->conn_cpumask
);
3708 static inline void iscsit_thread_check_cpumask(
3709 struct iscsi_conn
*conn
,
3710 struct task_struct
*p
,
3714 * mode == 1 signals iscsi_target_tx_thread() usage.
3715 * mode == 0 signals iscsi_target_rx_thread() usage.
3718 if (!conn
->conn_tx_reset_cpumask
)
3720 conn
->conn_tx_reset_cpumask
= 0;
3722 if (!conn
->conn_rx_reset_cpumask
)
3724 conn
->conn_rx_reset_cpumask
= 0;
3727 * Update the CPU mask for this single kthread so that
3728 * both TX and RX kthreads are scheduled to run on the
3731 set_cpus_allowed_ptr(p
, conn
->conn_cpumask
);
3735 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3740 case ISTATE_SEND_R2T
:
3741 ret
= iscsit_send_r2t(cmd
, conn
);
3746 spin_lock_bh(&conn
->cmd_lock
);
3747 list_del_init(&cmd
->i_conn_node
);
3748 spin_unlock_bh(&conn
->cmd_lock
);
3750 iscsit_free_cmd(cmd
, false);
3752 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3753 iscsit_mod_nopin_response_timer(conn
);
3754 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3758 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3759 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3764 pr_err("Unknown Opcode: 0x%02x ITT:"
3765 " 0x%08x, i_state: %d on CID: %hu\n",
3766 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3778 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3780 struct iscsit_transport
*t
= conn
->conn_transport
;
3781 struct iscsi_queue_req
*qr
;
3782 struct iscsi_cmd
*cmd
;
3786 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3787 atomic_set(&conn
->check_immediate_queue
, 0);
3790 kmem_cache_free(lio_qr_cache
, qr
);
3792 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3801 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3807 case ISTATE_SEND_DATAIN
:
3808 ret
= iscsit_send_datain(cmd
, conn
);
3813 goto check_rsp_state
;
3814 else if (ret
== 1) {
3816 spin_lock_bh(&cmd
->istate_lock
);
3817 cmd
->i_state
= ISTATE_SENT_STATUS
;
3818 spin_unlock_bh(&cmd
->istate_lock
);
3820 if (atomic_read(&conn
->check_immediate_queue
))
3824 } else if (ret
== 2) {
3825 /* Still must send status,
3826 SCF_TRANSPORT_TASK_SENSE was set */
3827 spin_lock_bh(&cmd
->istate_lock
);
3828 cmd
->i_state
= ISTATE_SEND_STATUS
;
3829 spin_unlock_bh(&cmd
->istate_lock
);
3830 state
= ISTATE_SEND_STATUS
;
3831 goto check_rsp_state
;
3835 case ISTATE_SEND_STATUS
:
3836 case ISTATE_SEND_STATUS_RECOVERY
:
3837 ret
= iscsit_send_response(cmd
, conn
);
3839 case ISTATE_SEND_LOGOUTRSP
:
3840 ret
= iscsit_send_logout(cmd
, conn
);
3842 case ISTATE_SEND_ASYNCMSG
:
3843 ret
= iscsit_send_conn_drop_async_message(
3846 case ISTATE_SEND_NOPIN
:
3847 ret
= iscsit_send_nopin(cmd
, conn
);
3849 case ISTATE_SEND_REJECT
:
3850 ret
= iscsit_send_reject(cmd
, conn
);
3852 case ISTATE_SEND_TASKMGTRSP
:
3853 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3856 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3858 iscsit_fall_back_to_erl0(conn
->sess
);
3860 case ISTATE_SEND_TEXTRSP
:
3861 ret
= iscsit_send_text_rsp(cmd
, conn
);
3864 pr_err("Unknown Opcode: 0x%02x ITT:"
3865 " 0x%08x, i_state: %d on CID: %hu\n",
3866 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3873 if (iscsit_send_tx_data(cmd
, conn
, 1) < 0) {
3874 iscsit_tx_thread_wait_for_tcp(conn
);
3875 iscsit_unmap_iovec(cmd
);
3878 iscsit_unmap_iovec(cmd
);
3881 case ISTATE_SEND_LOGOUTRSP
:
3882 if (!iscsit_logout_post_handler(cmd
, conn
))
3885 case ISTATE_SEND_STATUS
:
3886 case ISTATE_SEND_ASYNCMSG
:
3887 case ISTATE_SEND_NOPIN
:
3888 case ISTATE_SEND_STATUS_RECOVERY
:
3889 case ISTATE_SEND_TEXTRSP
:
3890 case ISTATE_SEND_TASKMGTRSP
:
3891 case ISTATE_SEND_REJECT
:
3892 spin_lock_bh(&cmd
->istate_lock
);
3893 cmd
->i_state
= ISTATE_SENT_STATUS
;
3894 spin_unlock_bh(&cmd
->istate_lock
);
3897 pr_err("Unknown Opcode: 0x%02x ITT:"
3898 " 0x%08x, i_state: %d on CID: %hu\n",
3899 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3900 cmd
->i_state
, conn
->cid
);
3904 if (atomic_read(&conn
->check_immediate_queue
))
3915 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3917 struct iscsit_transport
*t
= conn
->conn_transport
;
3918 struct iscsi_queue_req
*qr
;
3919 struct iscsi_cmd
*cmd
;
3923 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3926 kmem_cache_free(lio_qr_cache
, qr
);
3928 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3929 if (ret
== 1 || ret
< 0)
3936 int iscsi_target_tx_thread(void *arg
)
3939 struct iscsi_conn
*conn
;
3940 struct iscsi_thread_set
*ts
= arg
;
3942 * Allow ourselves to be interrupted by SIGINT so that a
3943 * connection recovery / failure event can be triggered externally.
3945 allow_signal(SIGINT
);
3948 conn
= iscsi_tx_thread_pre_handler(ts
);
3954 while (!kthread_should_stop()) {
3956 * Ensure that both TX and RX per connection kthreads
3957 * are scheduled to run on the same CPU.
3959 iscsit_thread_check_cpumask(conn
, current
, 1);
3961 wait_event_interruptible(conn
->queues_wq
,
3962 !iscsit_conn_all_queues_empty(conn
) ||
3963 ts
->status
== ISCSI_THREAD_SET_RESET
);
3965 if ((ts
->status
== ISCSI_THREAD_SET_RESET
) ||
3966 signal_pending(current
))
3970 ret
= iscsit_handle_immediate_queue(conn
);
3974 ret
= iscsit_handle_response_queue(conn
);
3977 else if (ret
== -EAGAIN
)
3984 iscsit_take_action_for_connection_exit(conn
);
3990 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
3992 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
3993 struct iscsi_cmd
*cmd
;
3996 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
3997 case ISCSI_OP_SCSI_CMD
:
3998 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4002 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
4004 case ISCSI_OP_SCSI_DATA_OUT
:
4005 ret
= iscsit_handle_data_out(conn
, buf
);
4007 case ISCSI_OP_NOOP_OUT
:
4009 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
4010 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4014 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
4016 case ISCSI_OP_SCSI_TMFUNC
:
4017 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4021 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
4024 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4028 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
4030 case ISCSI_OP_LOGOUT
:
4031 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4035 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
4037 wait_for_completion_timeout(&conn
->conn_logout_comp
,
4038 SECONDS_FOR_LOGOUT_COMP
* HZ
);
4040 case ISCSI_OP_SNACK
:
4041 ret
= iscsit_handle_snack(conn
, buf
);
4044 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
4045 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
4046 pr_err("Cannot recover from unknown"
4047 " opcode while ERL=0, closing iSCSI connection.\n");
4050 if (!conn
->conn_ops
->OFMarker
) {
4051 pr_err("Unable to recover from unknown"
4052 " opcode while OFMarker=No, closing iSCSI"
4056 if (iscsit_recover_from_unknown_opcode(conn
) < 0) {
4057 pr_err("Unable to recover from unknown"
4058 " opcode, closing iSCSI connection.\n");
4066 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
4069 int iscsi_target_rx_thread(void *arg
)
4072 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
4073 u32 checksum
= 0, digest
= 0;
4074 struct iscsi_conn
*conn
= NULL
;
4075 struct iscsi_thread_set
*ts
= arg
;
4078 * Allow ourselves to be interrupted by SIGINT so that a
4079 * connection recovery / failure event can be triggered externally.
4081 allow_signal(SIGINT
);
4084 conn
= iscsi_rx_thread_pre_handler(ts
);
4088 if (conn
->conn_transport
->transport_type
== ISCSI_INFINIBAND
) {
4089 struct completion comp
;
4092 init_completion(&comp
);
4093 rc
= wait_for_completion_interruptible(&comp
);
4100 while (!kthread_should_stop()) {
4102 * Ensure that both TX and RX per connection kthreads
4103 * are scheduled to run on the same CPU.
4105 iscsit_thread_check_cpumask(conn
, current
, 0);
4107 memset(buffer
, 0, ISCSI_HDR_LEN
);
4108 memset(&iov
, 0, sizeof(struct kvec
));
4110 iov
.iov_base
= buffer
;
4111 iov
.iov_len
= ISCSI_HDR_LEN
;
4113 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
4114 if (ret
!= ISCSI_HDR_LEN
) {
4115 iscsit_rx_thread_wait_for_tcp(conn
);
4119 if (conn
->conn_ops
->HeaderDigest
) {
4120 iov
.iov_base
= &digest
;
4121 iov
.iov_len
= ISCSI_CRC_LEN
;
4123 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
4124 if (ret
!= ISCSI_CRC_LEN
) {
4125 iscsit_rx_thread_wait_for_tcp(conn
);
4129 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
4130 buffer
, ISCSI_HDR_LEN
,
4131 0, NULL
, (u8
*)&checksum
);
4133 if (digest
!= checksum
) {
4134 pr_err("HeaderDigest CRC32C failed,"
4135 " received 0x%08x, computed 0x%08x\n",
4138 * Set the PDU to 0xff so it will intentionally
4139 * hit default in the switch below.
4141 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
4142 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
4144 pr_debug("Got HeaderDigest CRC32C"
4145 " 0x%08x\n", checksum
);
4149 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
4152 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
4154 if (conn
->sess
->sess_ops
->SessionType
&&
4155 ((!(opcode
& ISCSI_OP_TEXT
)) ||
4156 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
4157 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4158 " while in Discovery Session, rejecting.\n", opcode
);
4159 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
4164 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4170 if (!signal_pending(current
))
4171 atomic_set(&conn
->transport_failed
, 1);
4172 iscsit_take_action_for_connection_exit(conn
);
4178 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4180 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4181 struct iscsi_session
*sess
= conn
->sess
;
4183 * We expect this function to only ever be called from either RX or TX
4184 * thread context via iscsit_close_connection() once the other context
4185 * has been reset -> returned sleeping pre-handler state.
4187 spin_lock_bh(&conn
->cmd_lock
);
4188 list_for_each_entry_safe(cmd
, cmd_tmp
, &conn
->conn_cmd_list
, i_conn_node
) {
4190 list_del_init(&cmd
->i_conn_node
);
4191 spin_unlock_bh(&conn
->cmd_lock
);
4193 iscsit_increment_maxcmdsn(cmd
, sess
);
4195 iscsit_free_cmd(cmd
, true);
4197 spin_lock_bh(&conn
->cmd_lock
);
4199 spin_unlock_bh(&conn
->cmd_lock
);
4202 static void iscsit_stop_timers_for_cmds(
4203 struct iscsi_conn
*conn
)
4205 struct iscsi_cmd
*cmd
;
4207 spin_lock_bh(&conn
->cmd_lock
);
4208 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4209 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4210 iscsit_stop_dataout_timer(cmd
);
4212 spin_unlock_bh(&conn
->cmd_lock
);
4215 int iscsit_close_connection(
4216 struct iscsi_conn
*conn
)
4218 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4219 struct iscsi_session
*sess
= conn
->sess
;
4221 pr_debug("Closing iSCSI connection CID %hu on SID:"
4222 " %u\n", conn
->cid
, sess
->sid
);
4224 * Always up conn_logout_comp just in case the RX Thread is sleeping
4225 * and the logout response never got sent because the connection
4228 complete(&conn
->conn_logout_comp
);
4230 iscsi_release_thread_set(conn
);
4232 iscsit_stop_timers_for_cmds(conn
);
4233 iscsit_stop_nopin_response_timer(conn
);
4234 iscsit_stop_nopin_timer(conn
);
4236 if (conn
->conn_transport
->iscsit_wait_conn
)
4237 conn
->conn_transport
->iscsit_wait_conn(conn
);
4240 * During Connection recovery drop unacknowledged out of order
4241 * commands for this connection, and prepare the other commands
4244 * During normal operation clear the out of order commands (but
4245 * do not free the struct iscsi_ooo_cmdsn's) and release all
4246 * struct iscsi_cmds.
4248 if (atomic_read(&conn
->connection_recovery
)) {
4249 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4250 iscsit_prepare_cmds_for_realligance(conn
);
4252 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4253 iscsit_release_commands_from_conn(conn
);
4255 iscsit_free_queue_reqs_for_conn(conn
);
4258 * Handle decrementing session or connection usage count if
4259 * a logout response was not able to be sent because the
4260 * connection failed. Fall back to Session Recovery here.
4262 if (atomic_read(&conn
->conn_logout_remove
)) {
4263 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4264 iscsit_dec_conn_usage_count(conn
);
4265 iscsit_dec_session_usage_count(sess
);
4267 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4268 iscsit_dec_conn_usage_count(conn
);
4270 atomic_set(&conn
->conn_logout_remove
, 0);
4271 atomic_set(&sess
->session_reinstatement
, 0);
4272 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4275 spin_lock_bh(&sess
->conn_lock
);
4276 list_del(&conn
->conn_list
);
4279 * Attempt to let the Initiator know this connection failed by
4280 * sending an Connection Dropped Async Message on another
4281 * active connection.
4283 if (atomic_read(&conn
->connection_recovery
))
4284 iscsit_build_conn_drop_async_message(conn
);
4286 spin_unlock_bh(&sess
->conn_lock
);
4289 * If connection reinstatement is being performed on this connection,
4290 * up the connection reinstatement semaphore that is being blocked on
4291 * in iscsit_cause_connection_reinstatement().
4293 spin_lock_bh(&conn
->state_lock
);
4294 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4295 spin_unlock_bh(&conn
->state_lock
);
4296 complete(&conn
->conn_wait_comp
);
4297 wait_for_completion(&conn
->conn_post_wait_comp
);
4298 spin_lock_bh(&conn
->state_lock
);
4302 * If connection reinstatement is being performed on this connection
4303 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4304 * connection wait rcfr semaphore that is being blocked on
4305 * an iscsit_connection_reinstatement_rcfr().
4307 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4308 spin_unlock_bh(&conn
->state_lock
);
4309 complete(&conn
->conn_wait_rcfr_comp
);
4310 wait_for_completion(&conn
->conn_post_wait_comp
);
4311 spin_lock_bh(&conn
->state_lock
);
4313 atomic_set(&conn
->connection_reinstatement
, 1);
4314 spin_unlock_bh(&conn
->state_lock
);
4317 * If any other processes are accessing this connection pointer we
4318 * must wait until they have completed.
4320 iscsit_check_conn_usage_count(conn
);
4322 if (conn
->conn_rx_hash
.tfm
)
4323 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
4324 if (conn
->conn_tx_hash
.tfm
)
4325 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
4327 free_cpumask_var(conn
->conn_cpumask
);
4329 kfree(conn
->conn_ops
);
4330 conn
->conn_ops
= NULL
;
4333 sock_release(conn
->sock
);
4335 if (conn
->conn_transport
->iscsit_free_conn
)
4336 conn
->conn_transport
->iscsit_free_conn(conn
);
4338 iscsit_put_transport(conn
->conn_transport
);
4340 conn
->thread_set
= NULL
;
4342 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4343 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4346 spin_lock_bh(&sess
->conn_lock
);
4347 atomic_dec(&sess
->nconn
);
4348 pr_debug("Decremented iSCSI connection count to %hu from node:"
4349 " %s\n", atomic_read(&sess
->nconn
),
4350 sess
->sess_ops
->InitiatorName
);
4352 * Make sure that if one connection fails in an non ERL=2 iSCSI
4353 * Session that they all fail.
4355 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4356 !atomic_read(&sess
->session_logout
))
4357 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4360 * If this was not the last connection in the session, and we are
4361 * performing session reinstatement or falling back to ERL=0, call
4362 * iscsit_stop_session() without sleeping to shutdown the other
4363 * active connections.
4365 if (atomic_read(&sess
->nconn
)) {
4366 if (!atomic_read(&sess
->session_reinstatement
) &&
4367 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4368 spin_unlock_bh(&sess
->conn_lock
);
4371 if (!atomic_read(&sess
->session_stop_active
)) {
4372 atomic_set(&sess
->session_stop_active
, 1);
4373 spin_unlock_bh(&sess
->conn_lock
);
4374 iscsit_stop_session(sess
, 0, 0);
4377 spin_unlock_bh(&sess
->conn_lock
);
4382 * If this was the last connection in the session and one of the
4383 * following is occurring:
4385 * Session Reinstatement is not being performed, and are falling back
4386 * to ERL=0 call iscsit_close_session().
4388 * Session Logout was requested. iscsit_close_session() will be called
4391 * Session Continuation is not being performed, start the Time2Retain
4392 * handler and check if sleep_on_sess_wait_sem is active.
4394 if (!atomic_read(&sess
->session_reinstatement
) &&
4395 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4396 spin_unlock_bh(&sess
->conn_lock
);
4397 target_put_session(sess
->se_sess
);
4400 } else if (atomic_read(&sess
->session_logout
)) {
4401 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402 sess
->session_state
= TARG_SESS_STATE_FREE
;
4403 spin_unlock_bh(&sess
->conn_lock
);
4405 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4406 complete(&sess
->session_wait_comp
);
4410 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4411 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4413 if (!atomic_read(&sess
->session_continuation
)) {
4414 spin_unlock_bh(&sess
->conn_lock
);
4415 iscsit_start_time2retain_handler(sess
);
4417 spin_unlock_bh(&sess
->conn_lock
);
4419 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4420 complete(&sess
->session_wait_comp
);
4424 spin_unlock_bh(&sess
->conn_lock
);
4429 int iscsit_close_session(struct iscsi_session
*sess
)
4431 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4432 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4434 if (atomic_read(&sess
->nconn
)) {
4435 pr_err("%d connection(s) still exist for iSCSI session"
4436 " to %s\n", atomic_read(&sess
->nconn
),
4437 sess
->sess_ops
->InitiatorName
);
4441 spin_lock_bh(&se_tpg
->session_lock
);
4442 atomic_set(&sess
->session_logout
, 1);
4443 atomic_set(&sess
->session_reinstatement
, 1);
4444 iscsit_stop_time2retain_timer(sess
);
4445 spin_unlock_bh(&se_tpg
->session_lock
);
4448 * transport_deregister_session_configfs() will clear the
4449 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4450 * can be setting it again with __transport_register_session() in
4451 * iscsi_post_login_handler() again after the iscsit_stop_session()
4452 * completes in iscsi_np context.
4454 transport_deregister_session_configfs(sess
->se_sess
);
4457 * If any other processes are accessing this session pointer we must
4458 * wait until they have completed. If we are in an interrupt (the
4459 * time2retain handler) and contain and active session usage count we
4460 * restart the timer and exit.
4462 if (!in_interrupt()) {
4463 if (iscsit_check_session_usage_count(sess
) == 1)
4464 iscsit_stop_session(sess
, 1, 1);
4466 if (iscsit_check_session_usage_count(sess
) == 2) {
4467 atomic_set(&sess
->session_logout
, 0);
4468 iscsit_start_time2retain_handler(sess
);
4473 transport_deregister_session(sess
->se_sess
);
4475 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4476 iscsit_free_connection_recovery_entires(sess
);
4478 iscsit_free_all_ooo_cmdsns(sess
);
4480 spin_lock_bh(&se_tpg
->session_lock
);
4481 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4482 sess
->session_state
= TARG_SESS_STATE_FREE
;
4483 pr_debug("Released iSCSI session from node: %s\n",
4484 sess
->sess_ops
->InitiatorName
);
4487 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4489 pr_debug("Decremented number of active iSCSI Sessions on"
4490 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4492 spin_lock(&sess_idr_lock
);
4493 idr_remove(&sess_idr
, sess
->session_index
);
4494 spin_unlock(&sess_idr_lock
);
4496 kfree(sess
->sess_ops
);
4497 sess
->sess_ops
= NULL
;
4498 spin_unlock_bh(&se_tpg
->session_lock
);
4504 static void iscsit_logout_post_handler_closesession(
4505 struct iscsi_conn
*conn
)
4507 struct iscsi_session
*sess
= conn
->sess
;
4509 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4510 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4512 atomic_set(&conn
->conn_logout_remove
, 0);
4513 complete(&conn
->conn_logout_comp
);
4515 iscsit_dec_conn_usage_count(conn
);
4516 iscsit_stop_session(sess
, 1, 1);
4517 iscsit_dec_session_usage_count(sess
);
4518 target_put_session(sess
->se_sess
);
4521 static void iscsit_logout_post_handler_samecid(
4522 struct iscsi_conn
*conn
)
4524 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4525 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4527 atomic_set(&conn
->conn_logout_remove
, 0);
4528 complete(&conn
->conn_logout_comp
);
4530 iscsit_cause_connection_reinstatement(conn
, 1);
4531 iscsit_dec_conn_usage_count(conn
);
4534 static void iscsit_logout_post_handler_diffcid(
4535 struct iscsi_conn
*conn
,
4538 struct iscsi_conn
*l_conn
;
4539 struct iscsi_session
*sess
= conn
->sess
;
4540 bool conn_found
= false;
4545 spin_lock_bh(&sess
->conn_lock
);
4546 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4547 if (l_conn
->cid
== cid
) {
4548 iscsit_inc_conn_usage_count(l_conn
);
4553 spin_unlock_bh(&sess
->conn_lock
);
4559 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4561 spin_lock_bh(&l_conn
->state_lock
);
4562 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4563 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4564 spin_unlock_bh(&l_conn
->state_lock
);
4566 iscsit_cause_connection_reinstatement(l_conn
, 1);
4567 iscsit_dec_conn_usage_count(l_conn
);
4571 * Return of 0 causes the TX thread to restart.
4573 int iscsit_logout_post_handler(
4574 struct iscsi_cmd
*cmd
,
4575 struct iscsi_conn
*conn
)
4579 switch (cmd
->logout_reason
) {
4580 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4581 switch (cmd
->logout_response
) {
4582 case ISCSI_LOGOUT_SUCCESS
:
4583 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4585 iscsit_logout_post_handler_closesession(conn
);
4590 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4591 if (conn
->cid
== cmd
->logout_cid
) {
4592 switch (cmd
->logout_response
) {
4593 case ISCSI_LOGOUT_SUCCESS
:
4594 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4596 iscsit_logout_post_handler_samecid(conn
);
4601 switch (cmd
->logout_response
) {
4602 case ISCSI_LOGOUT_SUCCESS
:
4603 iscsit_logout_post_handler_diffcid(conn
,
4606 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4607 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4614 case ISCSI_LOGOUT_REASON_RECOVERY
:
4615 switch (cmd
->logout_response
) {
4616 case ISCSI_LOGOUT_SUCCESS
:
4617 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4618 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4619 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4631 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4633 void iscsit_fail_session(struct iscsi_session
*sess
)
4635 struct iscsi_conn
*conn
;
4637 spin_lock_bh(&sess
->conn_lock
);
4638 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4639 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4640 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4642 spin_unlock_bh(&sess
->conn_lock
);
4644 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4645 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4648 int iscsit_free_session(struct iscsi_session
*sess
)
4650 u16 conn_count
= atomic_read(&sess
->nconn
);
4651 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4654 spin_lock_bh(&sess
->conn_lock
);
4655 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4657 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4659 if (conn_count
== 0)
4662 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4665 iscsit_inc_conn_usage_count(conn_tmp
);
4668 iscsit_inc_conn_usage_count(conn
);
4670 spin_unlock_bh(&sess
->conn_lock
);
4671 iscsit_cause_connection_reinstatement(conn
, 1);
4672 spin_lock_bh(&sess
->conn_lock
);
4674 iscsit_dec_conn_usage_count(conn
);
4676 iscsit_dec_conn_usage_count(conn_tmp
);
4681 if (atomic_read(&sess
->nconn
)) {
4682 spin_unlock_bh(&sess
->conn_lock
);
4683 wait_for_completion(&sess
->session_wait_comp
);
4685 spin_unlock_bh(&sess
->conn_lock
);
4687 target_put_session(sess
->se_sess
);
4691 void iscsit_stop_session(
4692 struct iscsi_session
*sess
,
4694 int connection_sleep
)
4696 u16 conn_count
= atomic_read(&sess
->nconn
);
4697 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4700 spin_lock_bh(&sess
->conn_lock
);
4702 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4704 if (connection_sleep
) {
4705 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4707 if (conn_count
== 0)
4710 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4713 iscsit_inc_conn_usage_count(conn_tmp
);
4716 iscsit_inc_conn_usage_count(conn
);
4718 spin_unlock_bh(&sess
->conn_lock
);
4719 iscsit_cause_connection_reinstatement(conn
, 1);
4720 spin_lock_bh(&sess
->conn_lock
);
4722 iscsit_dec_conn_usage_count(conn
);
4724 iscsit_dec_conn_usage_count(conn_tmp
);
4728 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4729 iscsit_cause_connection_reinstatement(conn
, 0);
4732 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4733 spin_unlock_bh(&sess
->conn_lock
);
4734 wait_for_completion(&sess
->session_wait_comp
);
4736 spin_unlock_bh(&sess
->conn_lock
);
4739 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4741 struct iscsi_session
*sess
;
4742 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4743 struct se_session
*se_sess
, *se_sess_tmp
;
4744 int session_count
= 0;
4746 spin_lock_bh(&se_tpg
->session_lock
);
4747 if (tpg
->nsessions
&& !force
) {
4748 spin_unlock_bh(&se_tpg
->session_lock
);
4752 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4754 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4756 spin_lock(&sess
->conn_lock
);
4757 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4758 atomic_read(&sess
->session_logout
) ||
4759 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4760 spin_unlock(&sess
->conn_lock
);
4763 atomic_set(&sess
->session_reinstatement
, 1);
4764 spin_unlock(&sess
->conn_lock
);
4765 spin_unlock_bh(&se_tpg
->session_lock
);
4767 iscsit_free_session(sess
);
4768 spin_lock_bh(&se_tpg
->session_lock
);
4772 spin_unlock_bh(&se_tpg
->session_lock
);
4774 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4775 " Group: %hu\n", session_count
, tpg
->tpgt
);
4779 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4780 MODULE_VERSION("4.1.x");
4781 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4782 MODULE_LICENSE("GPL");
4784 module_init(iscsi_target_init_module
);
4785 module_exit(iscsi_target_cleanup_module
);