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 <target/iscsi/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 <target/iscsi/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 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
972 } else if (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)
973 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
974 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
975 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
976 cmd
->first_burst_len
= payload_length
;
978 if (!conn
->sess
->sess_ops
->RDMAExtensions
&&
979 cmd
->data_direction
== DMA_FROM_DEVICE
) {
980 struct iscsi_datain_req
*dr
;
982 dr
= iscsit_allocate_datain_req();
984 return iscsit_add_reject_cmd(cmd
,
985 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
987 iscsit_attach_datain_req(cmd
, dr
);
991 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
993 transport_init_se_cmd(&cmd
->se_cmd
, &lio_target_fabric_configfs
->tf_ops
,
994 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
995 cmd
->data_direction
, sam_task_attr
,
996 cmd
->sense_buffer
+ 2);
998 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
999 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
1000 hdr
->cmdsn
, be32_to_cpu(hdr
->data_length
), payload_length
,
1003 target_get_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
, true);
1005 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
1006 scsilun_to_int(&hdr
->lun
));
1007 if (cmd
->sense_reason
)
1010 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
1011 if (cmd
->sense_reason
) {
1012 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
1013 return iscsit_add_reject_cmd(cmd
,
1014 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1020 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
1021 return iscsit_add_reject_cmd(cmd
,
1022 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1026 spin_lock_bh(&conn
->cmd_lock
);
1027 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1028 spin_unlock_bh(&conn
->cmd_lock
);
1030 * Check if we need to delay processing because of ALUA
1031 * Active/NonOptimized primary access state..
1033 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1037 EXPORT_SYMBOL(iscsit_setup_scsi_cmd
);
1039 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd
*cmd
)
1041 iscsit_set_dataout_sequence_values(cmd
);
1043 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1044 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1045 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1047 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout
);
1049 int iscsit_process_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1050 struct iscsi_scsi_req
*hdr
)
1054 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1055 * the Immediate Bit is not set, and no Immediate
1058 * A PDU/CmdSN carrying Immediate Data can only
1059 * be processed after the DataCRC has passed.
1060 * If the DataCRC fails, the CmdSN MUST NOT
1061 * be acknowledged. (See below)
1063 if (!cmd
->immediate_data
) {
1064 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1065 (unsigned char *)hdr
, hdr
->cmdsn
);
1066 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1068 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1069 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1074 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1077 * If no Immediate Data is attached, it's OK to return now.
1079 if (!cmd
->immediate_data
) {
1080 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
)
1081 iscsit_set_unsoliticed_dataout(cmd
);
1082 if (!cmd
->sense_reason
)
1085 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1090 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1091 * execution. These exceptions are processed in CmdSN order using
1092 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1094 if (cmd
->sense_reason
) {
1095 if (cmd
->reject_reason
)
1101 * Call directly into transport_generic_new_cmd() to perform
1102 * the backend memory allocation.
1104 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1105 if (cmd
->sense_reason
)
1110 EXPORT_SYMBOL(iscsit_process_scsi_cmd
);
1113 iscsit_get_immediate_data(struct iscsi_cmd
*cmd
, struct iscsi_scsi_req
*hdr
,
1116 struct iscsi_conn
*conn
= cmd
->conn
;
1117 int cmdsn_ret
= 0, immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1119 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1122 goto after_immediate_data
;
1124 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1125 cmd
->first_burst_len
);
1126 after_immediate_data
:
1127 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1129 * A PDU/CmdSN carrying Immediate Data passed
1130 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1131 * Immediate Bit is not set.
1133 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1134 (unsigned char *)hdr
, hdr
->cmdsn
);
1135 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1138 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1141 rc
= iscsit_dump_data_payload(cmd
->conn
,
1142 cmd
->first_burst_len
, 1);
1143 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1145 } else if (cmd
->unsolicited_data
)
1146 iscsit_set_unsoliticed_dataout(cmd
);
1148 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1150 * Immediate Data failed DataCRC and ERL>=1,
1151 * silently drop this PDU and let the initiator
1152 * plug the CmdSN gap.
1154 * FIXME: Send Unsolicited NOPIN with reserved
1155 * TTT here to help the initiator figure out
1156 * the missing CmdSN, although they should be
1157 * intelligent enough to determine the missing
1158 * CmdSN and issue a retry to plug the sequence.
1160 cmd
->i_state
= ISTATE_REMOVE
;
1161 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1162 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1169 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1172 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1174 bool dump_payload
= false;
1176 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1180 * Allocation iovecs needed for struct socket operations for
1181 * traditional iSCSI block I/O.
1183 if (iscsit_allocate_iovecs(cmd
) < 0) {
1184 return iscsit_add_reject_cmd(cmd
,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1187 immed_data
= cmd
->immediate_data
;
1189 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1193 dump_payload
= true;
1198 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1201 static u32
iscsit_do_crypto_hash_sg(
1202 struct hash_desc
*hash
,
1203 struct iscsi_cmd
*cmd
,
1211 struct scatterlist
*sg
;
1212 unsigned int page_off
;
1214 crypto_hash_init(hash
);
1216 sg
= cmd
->first_data_sg
;
1217 page_off
= cmd
->first_data_sg_off
;
1220 while (data_length
) {
1221 u32 cur_len
= min_t(u32
, data_length
, (sg
[i
].length
- page_off
));
1223 crypto_hash_update(hash
, &sg
[i
], cur_len
);
1225 data_length
-= cur_len
;
1231 struct scatterlist pad_sg
;
1233 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1234 crypto_hash_update(hash
, &pad_sg
, padding
);
1236 crypto_hash_final(hash
, (u8
*) &data_crc
);
1241 static void iscsit_do_crypto_hash_buf(
1242 struct hash_desc
*hash
,
1249 struct scatterlist sg
;
1251 crypto_hash_init(hash
);
1253 sg_init_one(&sg
, buf
, payload_length
);
1254 crypto_hash_update(hash
, &sg
, payload_length
);
1257 sg_init_one(&sg
, pad_bytes
, padding
);
1258 crypto_hash_update(hash
, &sg
, padding
);
1260 crypto_hash_final(hash
, data_crc
);
1264 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, unsigned char *buf
,
1265 struct iscsi_cmd
**out_cmd
)
1267 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1268 struct iscsi_cmd
*cmd
= NULL
;
1269 struct se_cmd
*se_cmd
;
1270 u32 payload_length
= ntoh24(hdr
->dlength
);
1273 if (!payload_length
) {
1274 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1279 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1281 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1282 pr_err("DataSegmentLength: %u is greater than"
1283 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1284 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1285 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1289 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
,
1294 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1295 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1296 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1297 payload_length
, conn
->cid
);
1299 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1300 pr_err("Command ITT: 0x%08x received DataOUT after"
1301 " last DataOUT received, dumping payload\n",
1302 cmd
->init_task_tag
);
1303 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1306 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1307 pr_err("Command ITT: 0x%08x received DataOUT for a"
1308 " NON-WRITE command.\n", cmd
->init_task_tag
);
1309 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1311 se_cmd
= &cmd
->se_cmd
;
1312 iscsit_mod_dataout_timer(cmd
);
1314 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1315 pr_err("DataOut Offset: %u, Length %u greater than"
1316 " iSCSI Command EDTL %u, protocol error.\n",
1317 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1318 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1321 if (cmd
->unsolicited_data
) {
1322 int dump_unsolicited_data
= 0;
1324 if (conn
->sess
->sess_ops
->InitialR2T
) {
1325 pr_err("Received unexpected unsolicited data"
1326 " while InitialR2T=Yes, protocol error.\n");
1327 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1328 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1332 * Special case for dealing with Unsolicited DataOUT
1333 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1337 /* Something's amiss if we're not in WRITE_PENDING state... */
1338 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1339 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1340 dump_unsolicited_data
= 1;
1342 if (dump_unsolicited_data
) {
1344 * Check if a delayed TASK_ABORTED status needs to
1345 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1346 * received with the unsolicitied data out.
1348 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1349 iscsit_stop_dataout_timer(cmd
);
1351 transport_check_aborted_status(se_cmd
,
1352 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1353 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1357 * For the normal solicited data path:
1359 * Check for a delayed TASK_ABORTED status and dump any
1360 * incoming data out payload if one exists. Also, when the
1361 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1362 * data out sequence, we decrement outstanding_r2ts. Once
1363 * outstanding_r2ts reaches zero, go ahead and send the delayed
1364 * TASK_ABORTED status.
1366 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1367 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1368 if (--cmd
->outstanding_r2ts
< 1) {
1369 iscsit_stop_dataout_timer(cmd
);
1370 transport_check_aborted_status(
1374 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1378 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1379 * within-command recovery checks before receiving the payload.
1381 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1382 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1384 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1390 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1393 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1394 struct iscsi_data
*hdr
)
1397 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1398 u32 payload_length
= ntoh24(hdr
->dlength
);
1399 int iov_ret
, data_crc_failed
= 0;
1401 rx_size
+= payload_length
;
1402 iov
= &cmd
->iov_data
[0];
1404 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1409 iov_count
+= iov_ret
;
1411 padding
= ((-payload_length
) & 3);
1413 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1414 iov
[iov_count
++].iov_len
= padding
;
1416 pr_debug("Receiving %u padding bytes.\n", padding
);
1419 if (conn
->conn_ops
->DataDigest
) {
1420 iov
[iov_count
].iov_base
= &checksum
;
1421 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1422 rx_size
+= ISCSI_CRC_LEN
;
1425 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1427 iscsit_unmap_iovec(cmd
);
1429 if (rx_got
!= rx_size
)
1432 if (conn
->conn_ops
->DataDigest
) {
1435 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
1436 be32_to_cpu(hdr
->offset
),
1437 payload_length
, padding
,
1440 if (checksum
!= data_crc
) {
1441 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1442 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1443 " does not match computed 0x%08x\n",
1444 hdr
->itt
, hdr
->offset
, payload_length
,
1445 hdr
->datasn
, checksum
, data_crc
);
1446 data_crc_failed
= 1;
1448 pr_debug("Got CRC32C DataDigest 0x%08x for"
1449 " %u bytes of Data Out\n", checksum
,
1454 return data_crc_failed
;
1458 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1459 bool data_crc_failed
)
1461 struct iscsi_conn
*conn
= cmd
->conn
;
1464 * Increment post receive data and CRC values or perform
1465 * within-command recovery.
1467 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1468 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1470 else if (rc
== DATAOUT_SEND_R2T
) {
1471 iscsit_set_dataout_sequence_values(cmd
);
1472 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1473 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1475 * Handle extra special case for out of order
1476 * Unsolicited Data Out.
1478 spin_lock_bh(&cmd
->istate_lock
);
1479 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1480 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1481 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1482 spin_unlock_bh(&cmd
->istate_lock
);
1484 iscsit_stop_dataout_timer(cmd
);
1487 target_execute_cmd(&cmd
->se_cmd
);
1489 } else /* DATAOUT_CANNOT_RECOVER */
1494 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1496 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1498 struct iscsi_cmd
*cmd
= NULL
;
1499 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1501 bool data_crc_failed
= false;
1503 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1509 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1513 data_crc_failed
= true;
1515 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1518 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1519 struct iscsi_nopout
*hdr
)
1521 u32 payload_length
= ntoh24(hdr
->dlength
);
1523 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1524 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1526 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1527 (unsigned char *)hdr
);
1529 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1530 (unsigned char *)hdr
);
1533 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1534 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1535 " not set, protocol error.\n");
1537 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1538 (unsigned char *)hdr
);
1540 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1541 (unsigned char *)hdr
);
1544 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1545 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1546 " greater than MaxXmitDataSegmentLength: %u, protocol"
1547 " error.\n", payload_length
,
1548 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1550 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1551 (unsigned char *)hdr
);
1553 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1554 (unsigned char *)hdr
);
1557 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1558 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1559 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1560 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1563 * This is not a response to a Unsolicited NopIN, which means
1564 * it can either be a NOPOUT ping request (with a valid ITT),
1565 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1566 * Either way, make sure we allocate an struct iscsi_cmd, as both
1567 * can contain ping data.
1569 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1570 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1571 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1572 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1574 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1575 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1576 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1577 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1578 cmd
->data_direction
= DMA_NONE
;
1583 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1585 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1586 struct iscsi_nopout
*hdr
)
1588 struct iscsi_cmd
*cmd_p
= NULL
;
1591 * Initiator is expecting a NopIN ping reply..
1593 if (hdr
->itt
!= RESERVED_ITT
) {
1595 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1596 (unsigned char *)hdr
);
1598 spin_lock_bh(&conn
->cmd_lock
);
1599 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1600 spin_unlock_bh(&conn
->cmd_lock
);
1602 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1604 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1605 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1610 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1611 (unsigned char *)hdr
, hdr
->cmdsn
);
1612 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1614 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1620 * This was a response to a unsolicited NOPIN ping.
1622 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1623 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1627 iscsit_stop_nopin_response_timer(conn
);
1629 cmd_p
->i_state
= ISTATE_REMOVE
;
1630 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1632 iscsit_start_nopin_timer(conn
);
1636 * Otherwise, initiator is not expecting a NOPIN is response.
1637 * Just ignore for now.
1641 EXPORT_SYMBOL(iscsit_process_nop_out
);
1643 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1646 unsigned char *ping_data
= NULL
;
1647 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1648 struct kvec
*iov
= NULL
;
1649 u32 payload_length
= ntoh24(hdr
->dlength
);
1652 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1656 * Handle NOP-OUT payload for traditional iSCSI sockets
1658 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1659 u32 checksum
, data_crc
, padding
= 0;
1660 int niov
= 0, rx_got
, rx_size
= payload_length
;
1662 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1664 pr_err("Unable to allocate memory for"
1665 " NOPOUT ping data.\n");
1670 iov
= &cmd
->iov_misc
[0];
1671 iov
[niov
].iov_base
= ping_data
;
1672 iov
[niov
++].iov_len
= payload_length
;
1674 padding
= ((-payload_length
) & 3);
1676 pr_debug("Receiving %u additional bytes"
1677 " for padding.\n", padding
);
1678 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1679 iov
[niov
++].iov_len
= padding
;
1682 if (conn
->conn_ops
->DataDigest
) {
1683 iov
[niov
].iov_base
= &checksum
;
1684 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1685 rx_size
+= ISCSI_CRC_LEN
;
1688 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1689 if (rx_got
!= rx_size
) {
1694 if (conn
->conn_ops
->DataDigest
) {
1695 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1696 ping_data
, payload_length
,
1697 padding
, cmd
->pad_bytes
,
1700 if (checksum
!= data_crc
) {
1701 pr_err("Ping data CRC32C DataDigest"
1702 " 0x%08x does not match computed 0x%08x\n",
1703 checksum
, data_crc
);
1704 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1705 pr_err("Unable to recover from"
1706 " NOPOUT Ping DataCRC failure while in"
1712 * Silently drop this PDU and let the
1713 * initiator plug the CmdSN gap.
1715 pr_debug("Dropping NOPOUT"
1716 " Command CmdSN: 0x%08x due to"
1717 " DataCRC error.\n", hdr
->cmdsn
);
1722 pr_debug("Got CRC32C DataDigest"
1723 " 0x%08x for %u bytes of ping data.\n",
1724 checksum
, payload_length
);
1728 ping_data
[payload_length
] = '\0';
1730 * Attach ping data to struct iscsi_cmd->buf_ptr.
1732 cmd
->buf_ptr
= ping_data
;
1733 cmd
->buf_ptr_size
= payload_length
;
1735 pr_debug("Got %u bytes of NOPOUT ping"
1736 " data.\n", payload_length
);
1737 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1740 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1743 iscsit_free_cmd(cmd
, false);
1750 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1753 struct se_tmr_req
*se_tmr
;
1754 struct iscsi_tmr_req
*tmr_req
;
1755 struct iscsi_tm
*hdr
;
1756 int out_of_order_cmdsn
= 0, ret
;
1757 bool sess_ref
= false;
1760 hdr
= (struct iscsi_tm
*) buf
;
1761 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1762 function
= hdr
->flags
;
1764 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1765 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1766 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1767 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1769 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1770 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1771 hdr
->rtt
!= RESERVED_ITT
)) {
1772 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1773 hdr
->rtt
= RESERVED_ITT
;
1776 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1777 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1778 pr_err("Task Management Request TASK_REASSIGN not"
1779 " issued as immediate command, bad iSCSI Initiator"
1780 "implementation\n");
1781 return iscsit_add_reject_cmd(cmd
,
1782 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1784 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1785 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1786 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1788 cmd
->data_direction
= DMA_NONE
;
1790 cmd
->tmr_req
= kzalloc(sizeof(struct iscsi_tmr_req
), GFP_KERNEL
);
1791 if (!cmd
->tmr_req
) {
1792 pr_err("Unable to allocate memory for"
1793 " Task Management command!\n");
1794 return iscsit_add_reject_cmd(cmd
,
1795 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1800 * TASK_REASSIGN for ERL=2 / connection stays inside of
1801 * LIO-Target $FABRIC_MOD
1803 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1808 transport_init_se_cmd(&cmd
->se_cmd
,
1809 &lio_target_fabric_configfs
->tf_ops
,
1810 conn
->sess
->se_sess
, 0, DMA_NONE
,
1811 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
1813 target_get_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
, true);
1817 case ISCSI_TM_FUNC_ABORT_TASK
:
1818 tcm_function
= TMR_ABORT_TASK
;
1820 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1821 tcm_function
= TMR_ABORT_TASK_SET
;
1823 case ISCSI_TM_FUNC_CLEAR_ACA
:
1824 tcm_function
= TMR_CLEAR_ACA
;
1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1827 tcm_function
= TMR_CLEAR_TASK_SET
;
1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1830 tcm_function
= TMR_LUN_RESET
;
1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1833 tcm_function
= TMR_TARGET_WARM_RESET
;
1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1836 tcm_function
= TMR_TARGET_COLD_RESET
;
1839 pr_err("Unknown iSCSI TMR Function:"
1840 " 0x%02x\n", function
);
1841 return iscsit_add_reject_cmd(cmd
,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1845 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
,
1846 tcm_function
, GFP_KERNEL
);
1848 return iscsit_add_reject_cmd(cmd
,
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1851 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
1854 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
1855 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
1856 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1857 cmd
->init_task_tag
= hdr
->itt
;
1858 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1859 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1860 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1861 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
1862 tmr_req
= cmd
->tmr_req
;
1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1867 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
1868 scsilun_to_int(&hdr
->lun
));
1870 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
1876 case ISCSI_TM_FUNC_ABORT_TASK
:
1877 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
1878 if (se_tmr
->response
)
1881 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1882 case ISCSI_TM_FUNC_CLEAR_ACA
:
1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1887 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
1888 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1893 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
1894 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1898 case ISCSI_TM_FUNC_TASK_REASSIGN
:
1899 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
1901 * Perform sanity checks on the ExpDataSN only if the
1902 * TASK_REASSIGN was successful.
1904 if (se_tmr
->response
)
1907 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
1908 return iscsit_add_reject_cmd(cmd
,
1909 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1912 pr_err("Unknown TMR function: 0x%02x, protocol"
1913 " error.\n", function
);
1914 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
1918 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1919 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
1920 se_tmr
->call_transport
= 1;
1922 spin_lock_bh(&conn
->cmd_lock
);
1923 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1924 spin_unlock_bh(&conn
->cmd_lock
);
1926 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1927 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
1928 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
1929 out_of_order_cmdsn
= 1;
1930 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1932 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1935 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1937 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
1940 * Found the referenced task, send to transport for processing.
1942 if (se_tmr
->call_transport
)
1943 return transport_generic_handle_tmr(&cmd
->se_cmd
);
1946 * Could not find the referenced LUN, task, or Task Management
1947 * command not authorized or supported. Change state and
1948 * let the tx_thread send the response.
1950 * For connection recovery, this is also the default action for
1951 * TMR TASK_REASSIGN.
1954 pr_debug("Handle TMR, using sess_ref=true check\n");
1955 target_put_sess_cmd(conn
->sess
->se_sess
, &cmd
->se_cmd
);
1958 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1966 struct iscsi_text
*hdr
)
1968 u32 payload_length
= ntoh24(hdr
->dlength
);
1970 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1971 pr_err("Unable to accept text parameter length: %u"
1972 "greater than MaxXmitDataSegmentLength %u.\n",
1973 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1974 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1975 (unsigned char *)hdr
);
1978 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
1979 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
1980 pr_err("Multi sequence text commands currently not supported\n");
1981 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
1982 (unsigned char *)hdr
);
1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
1987 hdr
->exp_statsn
, payload_length
);
1989 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
1990 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
1991 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1992 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1993 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1994 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1995 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1996 cmd
->data_direction
= DMA_NONE
;
1997 cmd
->text_in_ptr
= NULL
;
2001 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2004 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2005 struct iscsi_text
*hdr
)
2007 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2011 cmd
->targ_xfer_tag
= be32_to_cpu(hdr
->ttt
);
2012 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2017 goto empty_sendtargets
;
2019 if (strncmp("SendTargets", text_in
, 11) != 0) {
2020 pr_err("Received Text Data that is not"
2021 " SendTargets, cannot continue.\n");
2024 text_ptr
= strchr(text_in
, '=');
2026 pr_err("No \"=\" separator found in Text Data,"
2027 " cannot continue.\n");
2030 if (!strncmp("=All", text_ptr
, 4)) {
2031 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2032 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2033 !strncmp("=eui.", text_ptr
, 5)) {
2034 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2036 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2040 spin_lock_bh(&conn
->cmd_lock
);
2041 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2042 spin_unlock_bh(&conn
->cmd_lock
);
2045 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2047 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2048 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2049 (unsigned char *)hdr
, hdr
->cmdsn
);
2050 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2056 return iscsit_execute_cmd(cmd
, 0);
2059 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2060 (unsigned char *)hdr
);
2062 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2065 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2068 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2069 char *text_in
= NULL
;
2070 u32 payload_length
= ntoh24(hdr
->dlength
);
2073 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2077 rx_size
= payload_length
;
2078 if (payload_length
) {
2079 u32 checksum
= 0, data_crc
= 0;
2080 u32 padding
= 0, pad_bytes
= 0;
2081 int niov
= 0, rx_got
;
2084 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2086 pr_err("Unable to allocate memory for"
2087 " incoming text parameters\n");
2090 cmd
->text_in_ptr
= text_in
;
2092 memset(iov
, 0, 3 * sizeof(struct kvec
));
2093 iov
[niov
].iov_base
= text_in
;
2094 iov
[niov
++].iov_len
= payload_length
;
2096 padding
= ((-payload_length
) & 3);
2098 iov
[niov
].iov_base
= &pad_bytes
;
2099 iov
[niov
++].iov_len
= padding
;
2101 pr_debug("Receiving %u additional bytes"
2102 " for padding.\n", padding
);
2104 if (conn
->conn_ops
->DataDigest
) {
2105 iov
[niov
].iov_base
= &checksum
;
2106 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2107 rx_size
+= ISCSI_CRC_LEN
;
2110 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2111 if (rx_got
!= rx_size
)
2114 if (conn
->conn_ops
->DataDigest
) {
2115 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
2116 text_in
, payload_length
,
2117 padding
, (u8
*)&pad_bytes
,
2120 if (checksum
!= data_crc
) {
2121 pr_err("Text data CRC32C DataDigest"
2122 " 0x%08x does not match computed"
2123 " 0x%08x\n", checksum
, data_crc
);
2124 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2125 pr_err("Unable to recover from"
2126 " Text Data digest failure while in"
2131 * Silently drop this PDU and let the
2132 * initiator plug the CmdSN gap.
2134 pr_debug("Dropping Text"
2135 " Command CmdSN: 0x%08x due to"
2136 " DataCRC error.\n", hdr
->cmdsn
);
2141 pr_debug("Got CRC32C DataDigest"
2142 " 0x%08x for %u bytes of text data.\n",
2143 checksum
, payload_length
);
2146 text_in
[payload_length
- 1] = '\0';
2147 pr_debug("Successfully read %d bytes of text"
2148 " data.\n", payload_length
);
2151 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2154 kfree(cmd
->text_in_ptr
);
2155 cmd
->text_in_ptr
= NULL
;
2156 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2158 EXPORT_SYMBOL(iscsit_handle_text_cmd
);
2160 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2162 struct iscsi_conn
*conn_p
;
2163 struct iscsi_session
*sess
= conn
->sess
;
2165 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2166 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2168 atomic_set(&sess
->session_logout
, 1);
2169 atomic_set(&conn
->conn_logout_remove
, 1);
2170 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2172 iscsit_inc_conn_usage_count(conn
);
2173 iscsit_inc_session_usage_count(sess
);
2175 spin_lock_bh(&sess
->conn_lock
);
2176 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2177 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2181 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2183 spin_unlock_bh(&sess
->conn_lock
);
2185 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2190 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2192 struct iscsi_conn
*l_conn
;
2193 struct iscsi_session
*sess
= conn
->sess
;
2195 pr_debug("Received logout request CLOSECONNECTION for CID:"
2196 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2199 * A Logout Request with a CLOSECONNECTION reason code for a CID
2200 * can arrive on a connection with a differing CID.
2202 if (conn
->cid
== cmd
->logout_cid
) {
2203 spin_lock_bh(&conn
->state_lock
);
2204 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2205 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2207 atomic_set(&conn
->conn_logout_remove
, 1);
2208 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2209 iscsit_inc_conn_usage_count(conn
);
2211 spin_unlock_bh(&conn
->state_lock
);
2214 * Handle all different cid CLOSECONNECTION requests in
2215 * iscsit_logout_post_handler_diffcid() as to give enough
2216 * time for any non immediate command's CmdSN to be
2217 * acknowledged on the connection in question.
2219 * Here we simply make sure the CID is still around.
2221 l_conn
= iscsit_get_conn_from_cid(sess
,
2224 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2225 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2230 iscsit_dec_conn_usage_count(l_conn
);
2233 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2240 struct iscsi_session
*sess
= conn
->sess
;
2242 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2243 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2245 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247 " while ERL!=2.\n");
2248 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2249 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2253 if (conn
->cid
== cmd
->logout_cid
) {
2254 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2255 " with CID: %hu on CID: %hu, implementation error.\n",
2256 cmd
->logout_cid
, conn
->cid
);
2257 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2258 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2262 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2268 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2271 int cmdsn_ret
, logout_remove
= 0;
2273 struct iscsi_logout
*hdr
;
2274 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2276 hdr
= (struct iscsi_logout
*) buf
;
2277 reason_code
= (hdr
->flags
& 0x7f);
2280 spin_lock(&tiqn
->logout_stats
.lock
);
2281 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2282 tiqn
->logout_stats
.normal_logouts
++;
2284 tiqn
->logout_stats
.abnormal_logouts
++;
2285 spin_unlock(&tiqn
->logout_stats
.lock
);
2288 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2289 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2290 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2291 hdr
->cid
, conn
->cid
);
2293 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2294 pr_err("Received logout request on connection that"
2295 " is not in logged in state, ignoring request.\n");
2296 iscsit_free_cmd(cmd
, false);
2300 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2301 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2302 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2303 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2304 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2305 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2306 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2307 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2308 cmd
->logout_reason
= reason_code
;
2309 cmd
->data_direction
= DMA_NONE
;
2312 * We need to sleep in these cases (by returning 1) until the Logout
2313 * Response gets sent in the tx thread.
2315 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2316 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2317 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2320 spin_lock_bh(&conn
->cmd_lock
);
2321 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2322 spin_unlock_bh(&conn
->cmd_lock
);
2324 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2325 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2328 * Immediate commands are executed, well, immediately.
2329 * Non-Immediate Logout Commands are executed in CmdSN order.
2331 if (cmd
->immediate_cmd
) {
2332 int ret
= iscsit_execute_cmd(cmd
, 0);
2337 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2338 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2340 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2344 return logout_remove
;
2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2348 static int iscsit_handle_snack(
2349 struct iscsi_conn
*conn
,
2352 struct iscsi_snack
*hdr
;
2354 hdr
= (struct iscsi_snack
*) buf
;
2355 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2357 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2358 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2359 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2360 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2362 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2363 pr_err("Initiator sent SNACK request while in"
2364 " ErrorRecoveryLevel=0.\n");
2365 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2369 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2370 * call from inside iscsi_send_recovery_datain_or_r2t().
2372 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2374 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2376 be32_to_cpu(hdr
->ttt
),
2377 be32_to_cpu(hdr
->begrun
),
2378 be32_to_cpu(hdr
->runlength
));
2379 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2380 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2381 be32_to_cpu(hdr
->ttt
),
2382 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2383 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2384 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2385 be32_to_cpu(hdr
->begrun
),
2386 be32_to_cpu(hdr
->runlength
));
2387 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2388 /* FIXME: Support R-Data SNACK */
2389 pr_err("R-Data SNACK Not Supported.\n");
2390 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2393 pr_err("Unknown SNACK type 0x%02x, protocol"
2394 " error.\n", hdr
->flags
& 0x0f);
2395 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2404 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2405 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2406 wait_for_completion_interruptible_timeout(
2407 &conn
->rx_half_close_comp
,
2408 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2412 static int iscsit_handle_immediate_data(
2413 struct iscsi_cmd
*cmd
,
2414 struct iscsi_scsi_req
*hdr
,
2417 int iov_ret
, rx_got
= 0, rx_size
= 0;
2418 u32 checksum
, iov_count
= 0, padding
= 0;
2419 struct iscsi_conn
*conn
= cmd
->conn
;
2422 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2424 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2427 iov_count
= iov_ret
;
2428 iov
= &cmd
->iov_data
[0];
2430 padding
= ((-length
) & 3);
2432 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2433 iov
[iov_count
++].iov_len
= padding
;
2437 if (conn
->conn_ops
->DataDigest
) {
2438 iov
[iov_count
].iov_base
= &checksum
;
2439 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2440 rx_size
+= ISCSI_CRC_LEN
;
2443 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2445 iscsit_unmap_iovec(cmd
);
2447 if (rx_got
!= rx_size
) {
2448 iscsit_rx_thread_wait_for_tcp(conn
);
2449 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2452 if (conn
->conn_ops
->DataDigest
) {
2455 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
2456 cmd
->write_data_done
, length
, padding
,
2459 if (checksum
!= data_crc
) {
2460 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2461 " does not match computed 0x%08x\n", checksum
,
2464 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2465 pr_err("Unable to recover from"
2466 " Immediate Data digest failure while"
2468 iscsit_reject_cmd(cmd
,
2469 ISCSI_REASON_DATA_DIGEST_ERROR
,
2470 (unsigned char *)hdr
);
2471 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2473 iscsit_reject_cmd(cmd
,
2474 ISCSI_REASON_DATA_DIGEST_ERROR
,
2475 (unsigned char *)hdr
);
2476 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2479 pr_debug("Got CRC32C DataDigest 0x%08x for"
2480 " %u bytes of Immediate Data\n", checksum
,
2485 cmd
->write_data_done
+= length
;
2487 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2488 spin_lock_bh(&cmd
->istate_lock
);
2489 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2490 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2491 spin_unlock_bh(&cmd
->istate_lock
);
2494 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2498 * Called with sess->conn_lock held.
2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2501 with active network interface */
2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2504 struct iscsi_cmd
*cmd
;
2505 struct iscsi_conn
*conn_p
;
2509 * Only send a Asynchronous Message on connections whos network
2510 * interface is still functional.
2512 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2513 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2514 iscsit_inc_conn_usage_count(conn_p
);
2523 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2525 iscsit_dec_conn_usage_count(conn_p
);
2529 cmd
->logout_cid
= conn
->cid
;
2530 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2531 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2533 spin_lock_bh(&conn_p
->cmd_lock
);
2534 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2535 spin_unlock_bh(&conn_p
->cmd_lock
);
2537 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2538 iscsit_dec_conn_usage_count(conn_p
);
2541 static int iscsit_send_conn_drop_async_message(
2542 struct iscsi_cmd
*cmd
,
2543 struct iscsi_conn
*conn
)
2545 struct iscsi_async
*hdr
;
2547 cmd
->tx_size
= ISCSI_HDR_LEN
;
2548 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2550 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2551 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2552 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2553 cmd
->init_task_tag
= RESERVED_ITT
;
2554 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2555 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2556 cmd
->stat_sn
= conn
->stat_sn
++;
2557 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2558 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2559 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2560 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2561 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2562 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2563 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2565 if (conn
->conn_ops
->HeaderDigest
) {
2566 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2568 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2569 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2571 cmd
->tx_size
+= ISCSI_CRC_LEN
;
2572 pr_debug("Attaching CRC32C HeaderDigest to"
2573 " Async Message 0x%08x\n", *header_digest
);
2576 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2577 cmd
->iov_misc
[0].iov_len
= cmd
->tx_size
;
2578 cmd
->iov_misc_count
= 1;
2580 pr_debug("Sending Connection Dropped Async Message StatSN:"
2581 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2582 cmd
->logout_cid
, conn
->cid
);
2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2588 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2589 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn
->tx_half_close_comp
,
2592 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2597 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2598 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2601 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2602 hdr
->flags
= datain
->flags
;
2603 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2604 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2605 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2606 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2607 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2608 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2609 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2612 hton24(hdr
->dlength
, datain
->length
);
2613 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2614 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2615 (struct scsi_lun
*)&hdr
->lun
);
2617 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2619 hdr
->itt
= cmd
->init_task_tag
;
2621 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2622 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2624 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2626 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2628 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2630 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2631 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2632 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2633 hdr
->offset
= cpu_to_be32(datain
->offset
);
2635 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2636 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2637 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2638 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2641 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2643 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2644 struct iscsi_datain datain
;
2645 struct iscsi_datain_req
*dr
;
2647 u32 iov_count
= 0, tx_size
= 0;
2648 int eodr
= 0, ret
, iov_ret
;
2649 bool set_statsn
= false;
2651 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2652 dr
= iscsit_get_datain_values(cmd
, &datain
);
2654 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2655 cmd
->init_task_tag
);
2659 * Be paranoid and double check the logic for now.
2661 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2662 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2663 " datain.length: %u exceeds cmd->data_length: %u\n",
2664 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2665 cmd
->se_cmd
.data_length
);
2669 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2671 * Special case for successfully execution w/ both DATAIN
2674 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2675 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2676 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2678 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2679 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2680 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2681 cmd
->stat_sn
= conn
->stat_sn
++;
2683 } else if (dr
->dr_complete
==
2684 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2688 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2690 iov
= &cmd
->iov_data
[0];
2691 iov
[iov_count
].iov_base
= cmd
->pdu
;
2692 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
2693 tx_size
+= ISCSI_HDR_LEN
;
2695 if (conn
->conn_ops
->HeaderDigest
) {
2696 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2698 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->pdu
,
2699 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2701 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2702 tx_size
+= ISCSI_CRC_LEN
;
2704 pr_debug("Attaching CRC32 HeaderDigest"
2705 " for DataIN PDU 0x%08x\n", *header_digest
);
2708 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1],
2709 datain
.offset
, datain
.length
);
2713 iov_count
+= iov_ret
;
2714 tx_size
+= datain
.length
;
2716 cmd
->padding
= ((-datain
.length
) & 3);
2718 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2719 iov
[iov_count
++].iov_len
= cmd
->padding
;
2720 tx_size
+= cmd
->padding
;
2722 pr_debug("Attaching %u padding bytes\n",
2725 if (conn
->conn_ops
->DataDigest
) {
2726 cmd
->data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_tx_hash
, cmd
,
2727 datain
.offset
, datain
.length
, cmd
->padding
, cmd
->pad_bytes
);
2729 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
2730 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2731 tx_size
+= ISCSI_CRC_LEN
;
2733 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2734 " 0x%08x\n", datain
.length
+cmd
->padding
, cmd
->data_crc
);
2737 cmd
->iov_data_count
= iov_count
;
2738 cmd
->tx_size
= tx_size
;
2740 /* sendpage is preferred but can't insert markers */
2741 if (!conn
->conn_ops
->IFMarker
)
2742 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
2744 ret
= iscsit_send_tx_data(cmd
, conn
, 0);
2746 iscsit_unmap_iovec(cmd
);
2749 iscsit_tx_thread_wait_for_tcp(conn
);
2753 if (dr
->dr_complete
) {
2754 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2756 iscsit_free_datain_req(cmd
, dr
);
2763 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2764 struct iscsi_logout_rsp
*hdr
)
2766 struct iscsi_conn
*logout_conn
= NULL
;
2767 struct iscsi_conn_recovery
*cr
= NULL
;
2768 struct iscsi_session
*sess
= conn
->sess
;
2770 * The actual shutting down of Sessions and/or Connections
2771 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2772 * is done in scsi_logout_post_handler().
2774 switch (cmd
->logout_reason
) {
2775 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2776 pr_debug("iSCSI session logout successful, setting"
2777 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2778 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2780 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2781 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2784 * For CLOSECONNECTION logout requests carrying
2785 * a matching logout CID -> local CID, the reference
2786 * for the local CID will have been incremented in
2787 * iscsi_logout_closeconnection().
2789 * For CLOSECONNECTION logout requests carrying
2790 * a different CID than the connection it arrived
2791 * on, the connection responding to cmd->logout_cid
2792 * is stopped in iscsit_logout_post_handler_diffcid().
2795 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2796 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2797 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2799 case ISCSI_LOGOUT_REASON_RECOVERY
:
2800 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2801 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2804 * If the connection is still active from our point of view
2805 * force connection recovery to occur.
2807 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2810 iscsit_connection_reinstatement_rcfr(logout_conn
);
2811 iscsit_dec_conn_usage_count(logout_conn
);
2814 cr
= iscsit_get_inactive_connection_recovery_entry(
2815 conn
->sess
, cmd
->logout_cid
);
2817 pr_err("Unable to locate CID: %hu for"
2818 " REMOVECONNFORRECOVERY Logout Request.\n",
2820 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2824 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2826 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2827 " for recovery for CID: %hu on CID: %hu successful.\n",
2828 cmd
->logout_cid
, conn
->cid
);
2829 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2832 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2833 cmd
->logout_reason
);
2837 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2838 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2839 hdr
->response
= cmd
->logout_response
;
2840 hdr
->itt
= cmd
->init_task_tag
;
2841 cmd
->stat_sn
= conn
->stat_sn
++;
2842 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2844 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2845 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2846 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2848 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2849 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2850 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2851 cmd
->logout_cid
, conn
->cid
);
2855 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2858 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2861 int niov
= 0, tx_size
, rc
;
2863 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2864 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2868 tx_size
= ISCSI_HDR_LEN
;
2869 iov
= &cmd
->iov_misc
[0];
2870 iov
[niov
].iov_base
= cmd
->pdu
;
2871 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2873 if (conn
->conn_ops
->HeaderDigest
) {
2874 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2876 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, &cmd
->pdu
[0],
2877 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2879 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2880 tx_size
+= ISCSI_CRC_LEN
;
2881 pr_debug("Attaching CRC32C HeaderDigest to"
2882 " Logout Response 0x%08x\n", *header_digest
);
2884 cmd
->iov_misc_count
= niov
;
2885 cmd
->tx_size
= tx_size
;
2891 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2892 struct iscsi_nopin
*hdr
, bool nopout_response
)
2894 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2895 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2896 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2897 if (nopout_response
)
2898 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2899 hdr
->itt
= cmd
->init_task_tag
;
2900 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2901 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2903 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2905 if (nopout_response
)
2906 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2908 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2909 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2911 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2912 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2913 "Solicitied" : "Unsolicitied", cmd
->init_task_tag
,
2914 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2916 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
2919 * Unsolicited NOPIN, either requesting a response or not.
2921 static int iscsit_send_unsolicited_nopin(
2922 struct iscsi_cmd
*cmd
,
2923 struct iscsi_conn
*conn
,
2926 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
2927 int tx_size
= ISCSI_HDR_LEN
, ret
;
2929 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
2931 if (conn
->conn_ops
->HeaderDigest
) {
2932 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2934 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2935 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2937 tx_size
+= ISCSI_CRC_LEN
;
2938 pr_debug("Attaching CRC32C HeaderDigest to"
2939 " NopIN 0x%08x\n", *header_digest
);
2942 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2943 cmd
->iov_misc
[0].iov_len
= tx_size
;
2944 cmd
->iov_misc_count
= 1;
2945 cmd
->tx_size
= tx_size
;
2947 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2948 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
2950 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
2952 iscsit_tx_thread_wait_for_tcp(conn
);
2956 spin_lock_bh(&cmd
->istate_lock
);
2957 cmd
->i_state
= want_response
?
2958 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
2959 spin_unlock_bh(&cmd
->istate_lock
);
2965 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2967 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
2970 int niov
= 0, tx_size
;
2972 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
2974 tx_size
= ISCSI_HDR_LEN
;
2975 iov
= &cmd
->iov_misc
[0];
2976 iov
[niov
].iov_base
= cmd
->pdu
;
2977 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2979 if (conn
->conn_ops
->HeaderDigest
) {
2980 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2982 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
2983 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
2985 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2986 tx_size
+= ISCSI_CRC_LEN
;
2987 pr_debug("Attaching CRC32C HeaderDigest"
2988 " to NopIn 0x%08x\n", *header_digest
);
2992 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2993 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2995 if (cmd
->buf_ptr_size
) {
2996 iov
[niov
].iov_base
= cmd
->buf_ptr
;
2997 iov
[niov
++].iov_len
= cmd
->buf_ptr_size
;
2998 tx_size
+= cmd
->buf_ptr_size
;
3000 pr_debug("Echoing back %u bytes of ping"
3001 " data.\n", cmd
->buf_ptr_size
);
3003 padding
= ((-cmd
->buf_ptr_size
) & 3);
3005 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
3006 iov
[niov
++].iov_len
= padding
;
3008 pr_debug("Attaching %u additional"
3009 " padding bytes.\n", padding
);
3011 if (conn
->conn_ops
->DataDigest
) {
3012 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3013 cmd
->buf_ptr
, cmd
->buf_ptr_size
,
3014 padding
, (u8
*)&cmd
->pad_bytes
,
3015 (u8
*)&cmd
->data_crc
);
3017 iov
[niov
].iov_base
= &cmd
->data_crc
;
3018 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
3019 tx_size
+= ISCSI_CRC_LEN
;
3020 pr_debug("Attached DataDigest for %u"
3021 " bytes of ping data, CRC 0x%08x\n",
3022 cmd
->buf_ptr_size
, cmd
->data_crc
);
3026 cmd
->iov_misc_count
= niov
;
3027 cmd
->tx_size
= tx_size
;
3032 static int iscsit_send_r2t(
3033 struct iscsi_cmd
*cmd
,
3034 struct iscsi_conn
*conn
)
3037 struct iscsi_r2t
*r2t
;
3038 struct iscsi_r2t_rsp
*hdr
;
3041 r2t
= iscsit_get_r2t_from_list(cmd
);
3045 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3046 memset(hdr
, 0, ISCSI_HDR_LEN
);
3047 hdr
->opcode
= ISCSI_OP_R2T
;
3048 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3049 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3050 (struct scsi_lun
*)&hdr
->lun
);
3051 hdr
->itt
= cmd
->init_task_tag
;
3052 r2t
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3053 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3054 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3055 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3056 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3057 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3058 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3059 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3061 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3062 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3063 tx_size
+= ISCSI_HDR_LEN
;
3065 if (conn
->conn_ops
->HeaderDigest
) {
3066 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3068 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3069 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3071 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3072 tx_size
+= ISCSI_CRC_LEN
;
3073 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3074 " PDU 0x%08x\n", *header_digest
);
3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3080 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3081 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3083 cmd
->iov_misc_count
= 1;
3084 cmd
->tx_size
= tx_size
;
3086 spin_lock_bh(&cmd
->r2t_lock
);
3088 spin_unlock_bh(&cmd
->r2t_lock
);
3090 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
3092 iscsit_tx_thread_wait_for_tcp(conn
);
3096 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3097 iscsit_start_dataout_timer(cmd
, conn
);
3098 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3104 * @recovery: If called from iscsi_task_reassign_complete_write() for
3105 * connection recovery.
3107 int iscsit_build_r2ts_for_cmd(
3108 struct iscsi_conn
*conn
,
3109 struct iscsi_cmd
*cmd
,
3113 u32 offset
= 0, xfer_len
= 0;
3115 spin_lock_bh(&cmd
->r2t_lock
);
3116 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3117 spin_unlock_bh(&cmd
->r2t_lock
);
3121 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3123 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3125 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3126 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3127 offset
= cmd
->r2t_offset
;
3129 if (first_r2t
&& recovery
) {
3130 int new_data_end
= offset
+
3131 conn
->sess
->sess_ops
->MaxBurstLength
-
3132 cmd
->next_burst_len
;
3134 if (new_data_end
> cmd
->se_cmd
.data_length
)
3135 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3138 conn
->sess
->sess_ops
->MaxBurstLength
-
3139 cmd
->next_burst_len
;
3141 int new_data_end
= offset
+
3142 conn
->sess
->sess_ops
->MaxBurstLength
;
3144 if (new_data_end
> cmd
->se_cmd
.data_length
)
3145 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3147 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3149 cmd
->r2t_offset
+= xfer_len
;
3151 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3152 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3154 struct iscsi_seq
*seq
;
3156 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3158 spin_unlock_bh(&cmd
->r2t_lock
);
3162 offset
= seq
->offset
;
3163 xfer_len
= seq
->xfer_len
;
3165 if (cmd
->seq_send_order
== cmd
->seq_count
)
3166 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3168 cmd
->outstanding_r2ts
++;
3171 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3172 spin_unlock_bh(&cmd
->r2t_lock
);
3176 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3179 spin_unlock_bh(&cmd
->r2t_lock
);
3184 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3185 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3188 cmd
->stat_sn
= conn
->stat_sn
++;
3190 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3192 memset(hdr
, 0, ISCSI_HDR_LEN
);
3193 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3194 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3195 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3196 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3197 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3198 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3199 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3200 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3202 hdr
->response
= cmd
->iscsi_response
;
3203 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3204 hdr
->itt
= cmd
->init_task_tag
;
3205 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3207 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3208 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3209 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3211 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3212 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3213 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3214 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3218 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3220 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3222 u32 padding
= 0, tx_size
= 0;
3224 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3226 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3228 iov
= &cmd
->iov_misc
[0];
3229 iov
[iov_count
].iov_base
= cmd
->pdu
;
3230 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3231 tx_size
+= ISCSI_HDR_LEN
;
3234 * Attach SENSE DATA payload to iSCSI Response PDU
3236 if (cmd
->se_cmd
.sense_buffer
&&
3237 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3238 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3239 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3240 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3242 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3243 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3244 iov
[iov_count
].iov_base
= cmd
->sense_buffer
;
3245 iov
[iov_count
++].iov_len
=
3246 (cmd
->se_cmd
.scsi_sense_length
+ padding
);
3247 tx_size
+= cmd
->se_cmd
.scsi_sense_length
;
3250 memset(cmd
->sense_buffer
+
3251 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3253 pr_debug("Adding %u bytes of padding to"
3254 " SENSE.\n", padding
);
3257 if (conn
->conn_ops
->DataDigest
) {
3258 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3260 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3261 0, NULL
, (u8
*)&cmd
->data_crc
);
3263 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3264 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3265 tx_size
+= ISCSI_CRC_LEN
;
3267 pr_debug("Attaching CRC32 DataDigest for"
3268 " SENSE, %u bytes CRC 0x%08x\n",
3269 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3273 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275 cmd
->se_cmd
.scsi_sense_length
);
3278 if (conn
->conn_ops
->HeaderDigest
) {
3279 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3281 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->pdu
,
3282 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3284 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3285 tx_size
+= ISCSI_CRC_LEN
;
3286 pr_debug("Attaching CRC32 HeaderDigest for Response"
3287 " PDU 0x%08x\n", *header_digest
);
3290 cmd
->iov_misc_count
= iov_count
;
3291 cmd
->tx_size
= tx_size
;
3296 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3298 switch (se_tmr
->response
) {
3299 case TMR_FUNCTION_COMPLETE
:
3300 return ISCSI_TMF_RSP_COMPLETE
;
3301 case TMR_TASK_DOES_NOT_EXIST
:
3302 return ISCSI_TMF_RSP_NO_TASK
;
3303 case TMR_LUN_DOES_NOT_EXIST
:
3304 return ISCSI_TMF_RSP_NO_LUN
;
3305 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3306 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3307 case TMR_FUNCTION_REJECTED
:
3309 return ISCSI_TMF_RSP_REJECTED
;
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3315 struct iscsi_tm_rsp
*hdr
)
3317 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3319 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3320 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3321 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3322 hdr
->itt
= cmd
->init_task_tag
;
3323 cmd
->stat_sn
= conn
->stat_sn
++;
3324 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3326 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3327 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3328 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3330 pr_debug("Built Task Management Response ITT: 0x%08x,"
3331 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3339 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3342 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3344 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3345 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3346 tx_size
+= ISCSI_HDR_LEN
;
3348 if (conn
->conn_ops
->HeaderDigest
) {
3349 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3351 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3352 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3354 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3355 tx_size
+= ISCSI_CRC_LEN
;
3356 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357 " Mgmt Response PDU 0x%08x\n", *header_digest
);
3360 cmd
->iov_misc_count
= 1;
3361 cmd
->tx_size
= tx_size
;
3366 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3370 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3371 const struct sockaddr_in6 sin6
= {
3372 .sin6_addr
= IN6ADDR_ANY_INIT
};
3373 struct sockaddr_in6
*sock_in6
=
3374 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3376 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3377 sin6
.sin6_addr
.s6_addr
, 16))
3380 struct sockaddr_in
* sock_in
=
3381 (struct sockaddr_in
*)&np
->np_sockaddr
;
3383 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3393 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3394 enum iscsit_transport_type network_transport
,
3395 int skip_bytes
, bool *completed
)
3397 char *payload
= NULL
;
3398 struct iscsi_conn
*conn
= cmd
->conn
;
3399 struct iscsi_portal_group
*tpg
;
3400 struct iscsi_tiqn
*tiqn
;
3401 struct iscsi_tpg_np
*tpg_np
;
3402 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3403 int target_name_printed
;
3404 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3405 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3407 buffer_len
= min(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3408 SENDTARGETS_BUF_LIMIT
);
3410 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3412 pr_err("Unable to allocate memory for sendtargets"
3417 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3420 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3421 text_ptr
= strchr(text_in
, '=');
3423 pr_err("Unable to locate '=' string in text_in:"
3429 * Skip over '=' character..
3434 spin_lock(&tiqn_lock
);
3435 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3436 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3437 strcmp(tiqn
->tiqn
, text_ptr
)) {
3441 target_name_printed
= 0;
3443 spin_lock(&tiqn
->tiqn_tpg_lock
);
3444 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3446 /* If demo_mode_discovery=0 and generate_node_acls=0
3447 * (demo mode dislabed) do not return
3448 * TargetName+TargetAddress unless a NodeACL exists.
3451 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3452 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3453 (!core_tpg_get_initiator_node_acl(&tpg
->tpg_se_tpg
,
3454 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3458 spin_lock(&tpg
->tpg_state_lock
);
3459 if ((tpg
->tpg_state
== TPG_STATE_FREE
) ||
3460 (tpg
->tpg_state
== TPG_STATE_INACTIVE
)) {
3461 spin_unlock(&tpg
->tpg_state_lock
);
3464 spin_unlock(&tpg
->tpg_state_lock
);
3466 spin_lock(&tpg
->tpg_np_lock
);
3467 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3469 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3470 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3472 if (np
->np_network_transport
!= network_transport
)
3475 if (!target_name_printed
) {
3476 len
= sprintf(buf
, "TargetName=%s",
3480 if ((len
+ payload_len
) > buffer_len
) {
3481 spin_unlock(&tpg
->tpg_np_lock
);
3482 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3487 if (skip_bytes
&& len
<= skip_bytes
) {
3490 memcpy(payload
+ payload_len
, buf
, len
);
3492 target_name_printed
= 1;
3493 if (len
> skip_bytes
)
3498 len
= sprintf(buf
, "TargetAddress="
3500 inaddr_any
? conn
->local_ip
: np
->np_ip
,
3505 if ((len
+ payload_len
) > buffer_len
) {
3506 spin_unlock(&tpg
->tpg_np_lock
);
3507 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3512 if (skip_bytes
&& len
<= skip_bytes
) {
3515 memcpy(payload
+ payload_len
, buf
, len
);
3517 if (len
> skip_bytes
)
3521 spin_unlock(&tpg
->tpg_np_lock
);
3523 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3530 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3533 spin_unlock(&tiqn_lock
);
3535 cmd
->buf_ptr
= payload
;
3541 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3542 struct iscsi_text_rsp
*hdr
,
3543 enum iscsit_transport_type network_transport
)
3545 int text_length
, padding
;
3546 bool completed
= true;
3548 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
,
3549 cmd
->read_data_done
,
3551 if (text_length
< 0)
3555 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3557 hdr
->flags
|= ISCSI_FLAG_TEXT_CONTINUE
;
3558 cmd
->read_data_done
+= text_length
;
3559 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
3560 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3562 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3563 padding
= ((-text_length
) & 3);
3564 hton24(hdr
->dlength
, text_length
);
3565 hdr
->itt
= cmd
->init_task_tag
;
3566 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3567 cmd
->stat_sn
= conn
->stat_sn
++;
3568 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3570 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3572 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3573 * correctly increment MaxCmdSN for each response answering a
3574 * non immediate text request with a valid CmdSN.
3576 cmd
->maxcmdsn_inc
= 0;
3577 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3578 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3580 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3581 " Length: %u, CID: %hu F: %d C: %d\n", cmd
->init_task_tag
,
3582 cmd
->targ_xfer_tag
, cmd
->stat_sn
, text_length
, conn
->cid
,
3583 !!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
),
3584 !!(hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
));
3586 return text_length
+ padding
;
3588 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3590 static int iscsit_send_text_rsp(
3591 struct iscsi_cmd
*cmd
,
3592 struct iscsi_conn
*conn
)
3594 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3597 int text_length
, iov_count
= 0, rc
;
3599 rc
= iscsit_build_text_rsp(cmd
, conn
, hdr
, ISCSI_TCP
);
3604 iov
= &cmd
->iov_misc
[0];
3605 iov
[iov_count
].iov_base
= cmd
->pdu
;
3606 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3607 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3608 iov
[iov_count
++].iov_len
= text_length
;
3610 tx_size
+= (ISCSI_HDR_LEN
+ text_length
);
3612 if (conn
->conn_ops
->HeaderDigest
) {
3613 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3615 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3616 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3618 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3619 tx_size
+= ISCSI_CRC_LEN
;
3620 pr_debug("Attaching CRC32 HeaderDigest for"
3621 " Text Response PDU 0x%08x\n", *header_digest
);
3624 if (conn
->conn_ops
->DataDigest
) {
3625 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3626 cmd
->buf_ptr
, text_length
,
3627 0, NULL
, (u8
*)&cmd
->data_crc
);
3629 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3630 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3631 tx_size
+= ISCSI_CRC_LEN
;
3633 pr_debug("Attaching DataDigest for %u bytes of text"
3634 " data, CRC 0x%08x\n", text_length
,
3638 cmd
->iov_misc_count
= iov_count
;
3639 cmd
->tx_size
= tx_size
;
3645 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3646 struct iscsi_reject
*hdr
)
3648 hdr
->opcode
= ISCSI_OP_REJECT
;
3649 hdr
->reason
= cmd
->reject_reason
;
3650 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3651 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3652 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3653 cmd
->stat_sn
= conn
->stat_sn
++;
3654 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3655 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3656 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3659 EXPORT_SYMBOL(iscsit_build_reject
);
3661 static int iscsit_send_reject(
3662 struct iscsi_cmd
*cmd
,
3663 struct iscsi_conn
*conn
)
3665 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3667 u32 iov_count
= 0, tx_size
;
3669 iscsit_build_reject(cmd
, conn
, hdr
);
3671 iov
= &cmd
->iov_misc
[0];
3672 iov
[iov_count
].iov_base
= cmd
->pdu
;
3673 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3674 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3675 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3677 tx_size
= (ISCSI_HDR_LEN
+ ISCSI_HDR_LEN
);
3679 if (conn
->conn_ops
->HeaderDigest
) {
3680 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3682 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, hdr
,
3683 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)header_digest
);
3685 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3686 tx_size
+= ISCSI_CRC_LEN
;
3687 pr_debug("Attaching CRC32 HeaderDigest for"
3688 " REJECT PDU 0x%08x\n", *header_digest
);
3691 if (conn
->conn_ops
->DataDigest
) {
3692 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
, cmd
->buf_ptr
,
3693 ISCSI_HDR_LEN
, 0, NULL
, (u8
*)&cmd
->data_crc
);
3695 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3696 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3697 tx_size
+= ISCSI_CRC_LEN
;
3698 pr_debug("Attaching CRC32 DataDigest for REJECT"
3699 " PDU 0x%08x\n", cmd
->data_crc
);
3702 cmd
->iov_misc_count
= iov_count
;
3703 cmd
->tx_size
= tx_size
;
3705 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3706 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3711 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3713 struct iscsi_thread_set
*ts
= conn
->thread_set
;
3716 * thread_id is assigned from iscsit_global->ts_bitmap from
3717 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3719 * Here we use thread_id to determine which CPU that this
3720 * iSCSI connection's iscsi_thread_set will be scheduled to
3723 ord
= ts
->thread_id
% cpumask_weight(cpu_online_mask
);
3724 for_each_online_cpu(cpu
) {
3726 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3731 * This should never be reached..
3734 cpumask_setall(conn
->conn_cpumask
);
3737 static inline void iscsit_thread_check_cpumask(
3738 struct iscsi_conn
*conn
,
3739 struct task_struct
*p
,
3743 * mode == 1 signals iscsi_target_tx_thread() usage.
3744 * mode == 0 signals iscsi_target_rx_thread() usage.
3747 if (!conn
->conn_tx_reset_cpumask
)
3749 conn
->conn_tx_reset_cpumask
= 0;
3751 if (!conn
->conn_rx_reset_cpumask
)
3753 conn
->conn_rx_reset_cpumask
= 0;
3756 * Update the CPU mask for this single kthread so that
3757 * both TX and RX kthreads are scheduled to run on the
3760 set_cpus_allowed_ptr(p
, conn
->conn_cpumask
);
3764 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3769 case ISTATE_SEND_R2T
:
3770 ret
= iscsit_send_r2t(cmd
, conn
);
3775 spin_lock_bh(&conn
->cmd_lock
);
3776 list_del_init(&cmd
->i_conn_node
);
3777 spin_unlock_bh(&conn
->cmd_lock
);
3779 iscsit_free_cmd(cmd
, false);
3781 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3782 iscsit_mod_nopin_response_timer(conn
);
3783 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3787 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3788 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3793 pr_err("Unknown Opcode: 0x%02x ITT:"
3794 " 0x%08x, i_state: %d on CID: %hu\n",
3795 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3807 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3809 struct iscsit_transport
*t
= conn
->conn_transport
;
3810 struct iscsi_queue_req
*qr
;
3811 struct iscsi_cmd
*cmd
;
3815 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3816 atomic_set(&conn
->check_immediate_queue
, 0);
3819 kmem_cache_free(lio_qr_cache
, qr
);
3821 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3830 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3836 case ISTATE_SEND_DATAIN
:
3837 ret
= iscsit_send_datain(cmd
, conn
);
3842 goto check_rsp_state
;
3843 else if (ret
== 1) {
3845 spin_lock_bh(&cmd
->istate_lock
);
3846 cmd
->i_state
= ISTATE_SENT_STATUS
;
3847 spin_unlock_bh(&cmd
->istate_lock
);
3849 if (atomic_read(&conn
->check_immediate_queue
))
3853 } else if (ret
== 2) {
3854 /* Still must send status,
3855 SCF_TRANSPORT_TASK_SENSE was set */
3856 spin_lock_bh(&cmd
->istate_lock
);
3857 cmd
->i_state
= ISTATE_SEND_STATUS
;
3858 spin_unlock_bh(&cmd
->istate_lock
);
3859 state
= ISTATE_SEND_STATUS
;
3860 goto check_rsp_state
;
3864 case ISTATE_SEND_STATUS
:
3865 case ISTATE_SEND_STATUS_RECOVERY
:
3866 ret
= iscsit_send_response(cmd
, conn
);
3868 case ISTATE_SEND_LOGOUTRSP
:
3869 ret
= iscsit_send_logout(cmd
, conn
);
3871 case ISTATE_SEND_ASYNCMSG
:
3872 ret
= iscsit_send_conn_drop_async_message(
3875 case ISTATE_SEND_NOPIN
:
3876 ret
= iscsit_send_nopin(cmd
, conn
);
3878 case ISTATE_SEND_REJECT
:
3879 ret
= iscsit_send_reject(cmd
, conn
);
3881 case ISTATE_SEND_TASKMGTRSP
:
3882 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3885 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3887 iscsit_fall_back_to_erl0(conn
->sess
);
3889 case ISTATE_SEND_TEXTRSP
:
3890 ret
= iscsit_send_text_rsp(cmd
, conn
);
3893 pr_err("Unknown Opcode: 0x%02x ITT:"
3894 " 0x%08x, i_state: %d on CID: %hu\n",
3895 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3902 if (iscsit_send_tx_data(cmd
, conn
, 1) < 0) {
3903 iscsit_tx_thread_wait_for_tcp(conn
);
3904 iscsit_unmap_iovec(cmd
);
3907 iscsit_unmap_iovec(cmd
);
3910 case ISTATE_SEND_LOGOUTRSP
:
3911 if (!iscsit_logout_post_handler(cmd
, conn
))
3914 case ISTATE_SEND_STATUS
:
3915 case ISTATE_SEND_ASYNCMSG
:
3916 case ISTATE_SEND_NOPIN
:
3917 case ISTATE_SEND_STATUS_RECOVERY
:
3918 case ISTATE_SEND_TEXTRSP
:
3919 case ISTATE_SEND_TASKMGTRSP
:
3920 case ISTATE_SEND_REJECT
:
3921 spin_lock_bh(&cmd
->istate_lock
);
3922 cmd
->i_state
= ISTATE_SENT_STATUS
;
3923 spin_unlock_bh(&cmd
->istate_lock
);
3926 pr_err("Unknown Opcode: 0x%02x ITT:"
3927 " 0x%08x, i_state: %d on CID: %hu\n",
3928 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3929 cmd
->i_state
, conn
->cid
);
3933 if (atomic_read(&conn
->check_immediate_queue
))
3944 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3946 struct iscsit_transport
*t
= conn
->conn_transport
;
3947 struct iscsi_queue_req
*qr
;
3948 struct iscsi_cmd
*cmd
;
3952 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3955 kmem_cache_free(lio_qr_cache
, qr
);
3957 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3958 if (ret
== 1 || ret
< 0)
3965 int iscsi_target_tx_thread(void *arg
)
3968 struct iscsi_conn
*conn
;
3969 struct iscsi_thread_set
*ts
= arg
;
3971 * Allow ourselves to be interrupted by SIGINT so that a
3972 * connection recovery / failure event can be triggered externally.
3974 allow_signal(SIGINT
);
3977 conn
= iscsi_tx_thread_pre_handler(ts
);
3983 while (!kthread_should_stop()) {
3985 * Ensure that both TX and RX per connection kthreads
3986 * are scheduled to run on the same CPU.
3988 iscsit_thread_check_cpumask(conn
, current
, 1);
3990 wait_event_interruptible(conn
->queues_wq
,
3991 !iscsit_conn_all_queues_empty(conn
) ||
3992 ts
->status
== ISCSI_THREAD_SET_RESET
);
3994 if ((ts
->status
== ISCSI_THREAD_SET_RESET
) ||
3995 signal_pending(current
))
3999 ret
= iscsit_handle_immediate_queue(conn
);
4003 ret
= iscsit_handle_response_queue(conn
);
4006 else if (ret
== -EAGAIN
)
4013 iscsit_take_action_for_connection_exit(conn
);
4019 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
4021 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
4022 struct iscsi_cmd
*cmd
;
4025 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
4026 case ISCSI_OP_SCSI_CMD
:
4027 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4031 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
4033 case ISCSI_OP_SCSI_DATA_OUT
:
4034 ret
= iscsit_handle_data_out(conn
, buf
);
4036 case ISCSI_OP_NOOP_OUT
:
4038 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
4039 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4043 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
4045 case ISCSI_OP_SCSI_TMFUNC
:
4046 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4050 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
4053 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
4054 cmd
= iscsit_find_cmd_from_itt(conn
, hdr
->itt
);
4058 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4063 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
4065 case ISCSI_OP_LOGOUT
:
4066 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
4070 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
4072 wait_for_completion_timeout(&conn
->conn_logout_comp
,
4073 SECONDS_FOR_LOGOUT_COMP
* HZ
);
4075 case ISCSI_OP_SNACK
:
4076 ret
= iscsit_handle_snack(conn
, buf
);
4079 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
4080 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
4081 pr_err("Cannot recover from unknown"
4082 " opcode while ERL=0, closing iSCSI connection.\n");
4085 if (!conn
->conn_ops
->OFMarker
) {
4086 pr_err("Unable to recover from unknown"
4087 " opcode while OFMarker=No, closing iSCSI"
4091 if (iscsit_recover_from_unknown_opcode(conn
) < 0) {
4092 pr_err("Unable to recover from unknown"
4093 " opcode, closing iSCSI connection.\n");
4101 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
4104 int iscsi_target_rx_thread(void *arg
)
4107 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
4108 u32 checksum
= 0, digest
= 0;
4109 struct iscsi_conn
*conn
= NULL
;
4110 struct iscsi_thread_set
*ts
= arg
;
4113 * Allow ourselves to be interrupted by SIGINT so that a
4114 * connection recovery / failure event can be triggered externally.
4116 allow_signal(SIGINT
);
4119 conn
= iscsi_rx_thread_pre_handler(ts
);
4123 if (conn
->conn_transport
->transport_type
== ISCSI_INFINIBAND
) {
4124 struct completion comp
;
4127 init_completion(&comp
);
4128 rc
= wait_for_completion_interruptible(&comp
);
4135 while (!kthread_should_stop()) {
4137 * Ensure that both TX and RX per connection kthreads
4138 * are scheduled to run on the same CPU.
4140 iscsit_thread_check_cpumask(conn
, current
, 0);
4142 memset(buffer
, 0, ISCSI_HDR_LEN
);
4143 memset(&iov
, 0, sizeof(struct kvec
));
4145 iov
.iov_base
= buffer
;
4146 iov
.iov_len
= ISCSI_HDR_LEN
;
4148 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
4149 if (ret
!= ISCSI_HDR_LEN
) {
4150 iscsit_rx_thread_wait_for_tcp(conn
);
4154 if (conn
->conn_ops
->HeaderDigest
) {
4155 iov
.iov_base
= &digest
;
4156 iov
.iov_len
= ISCSI_CRC_LEN
;
4158 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
4159 if (ret
!= ISCSI_CRC_LEN
) {
4160 iscsit_rx_thread_wait_for_tcp(conn
);
4164 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
4165 buffer
, ISCSI_HDR_LEN
,
4166 0, NULL
, (u8
*)&checksum
);
4168 if (digest
!= checksum
) {
4169 pr_err("HeaderDigest CRC32C failed,"
4170 " received 0x%08x, computed 0x%08x\n",
4173 * Set the PDU to 0xff so it will intentionally
4174 * hit default in the switch below.
4176 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
4177 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
4179 pr_debug("Got HeaderDigest CRC32C"
4180 " 0x%08x\n", checksum
);
4184 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
4187 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
4189 if (conn
->sess
->sess_ops
->SessionType
&&
4190 ((!(opcode
& ISCSI_OP_TEXT
)) ||
4191 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
4192 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4193 " while in Discovery Session, rejecting.\n", opcode
);
4194 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
4199 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4205 if (!signal_pending(current
))
4206 atomic_set(&conn
->transport_failed
, 1);
4207 iscsit_take_action_for_connection_exit(conn
);
4213 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4215 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4216 struct iscsi_session
*sess
= conn
->sess
;
4218 * We expect this function to only ever be called from either RX or TX
4219 * thread context via iscsit_close_connection() once the other context
4220 * has been reset -> returned sleeping pre-handler state.
4222 spin_lock_bh(&conn
->cmd_lock
);
4223 list_for_each_entry_safe(cmd
, cmd_tmp
, &conn
->conn_cmd_list
, i_conn_node
) {
4225 list_del_init(&cmd
->i_conn_node
);
4226 spin_unlock_bh(&conn
->cmd_lock
);
4228 iscsit_increment_maxcmdsn(cmd
, sess
);
4230 iscsit_free_cmd(cmd
, true);
4232 spin_lock_bh(&conn
->cmd_lock
);
4234 spin_unlock_bh(&conn
->cmd_lock
);
4237 static void iscsit_stop_timers_for_cmds(
4238 struct iscsi_conn
*conn
)
4240 struct iscsi_cmd
*cmd
;
4242 spin_lock_bh(&conn
->cmd_lock
);
4243 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4244 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4245 iscsit_stop_dataout_timer(cmd
);
4247 spin_unlock_bh(&conn
->cmd_lock
);
4250 int iscsit_close_connection(
4251 struct iscsi_conn
*conn
)
4253 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4254 struct iscsi_session
*sess
= conn
->sess
;
4256 pr_debug("Closing iSCSI connection CID %hu on SID:"
4257 " %u\n", conn
->cid
, sess
->sid
);
4259 * Always up conn_logout_comp just in case the RX Thread is sleeping
4260 * and the logout response never got sent because the connection
4263 complete(&conn
->conn_logout_comp
);
4265 iscsi_release_thread_set(conn
);
4267 iscsit_stop_timers_for_cmds(conn
);
4268 iscsit_stop_nopin_response_timer(conn
);
4269 iscsit_stop_nopin_timer(conn
);
4271 if (conn
->conn_transport
->iscsit_wait_conn
)
4272 conn
->conn_transport
->iscsit_wait_conn(conn
);
4275 * During Connection recovery drop unacknowledged out of order
4276 * commands for this connection, and prepare the other commands
4279 * During normal operation clear the out of order commands (but
4280 * do not free the struct iscsi_ooo_cmdsn's) and release all
4281 * struct iscsi_cmds.
4283 if (atomic_read(&conn
->connection_recovery
)) {
4284 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4285 iscsit_prepare_cmds_for_realligance(conn
);
4287 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4288 iscsit_release_commands_from_conn(conn
);
4290 iscsit_free_queue_reqs_for_conn(conn
);
4293 * Handle decrementing session or connection usage count if
4294 * a logout response was not able to be sent because the
4295 * connection failed. Fall back to Session Recovery here.
4297 if (atomic_read(&conn
->conn_logout_remove
)) {
4298 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4299 iscsit_dec_conn_usage_count(conn
);
4300 iscsit_dec_session_usage_count(sess
);
4302 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4303 iscsit_dec_conn_usage_count(conn
);
4305 atomic_set(&conn
->conn_logout_remove
, 0);
4306 atomic_set(&sess
->session_reinstatement
, 0);
4307 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4310 spin_lock_bh(&sess
->conn_lock
);
4311 list_del(&conn
->conn_list
);
4314 * Attempt to let the Initiator know this connection failed by
4315 * sending an Connection Dropped Async Message on another
4316 * active connection.
4318 if (atomic_read(&conn
->connection_recovery
))
4319 iscsit_build_conn_drop_async_message(conn
);
4321 spin_unlock_bh(&sess
->conn_lock
);
4324 * If connection reinstatement is being performed on this connection,
4325 * up the connection reinstatement semaphore that is being blocked on
4326 * in iscsit_cause_connection_reinstatement().
4328 spin_lock_bh(&conn
->state_lock
);
4329 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4330 spin_unlock_bh(&conn
->state_lock
);
4331 complete(&conn
->conn_wait_comp
);
4332 wait_for_completion(&conn
->conn_post_wait_comp
);
4333 spin_lock_bh(&conn
->state_lock
);
4337 * If connection reinstatement is being performed on this connection
4338 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4339 * connection wait rcfr semaphore that is being blocked on
4340 * an iscsit_connection_reinstatement_rcfr().
4342 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4343 spin_unlock_bh(&conn
->state_lock
);
4344 complete(&conn
->conn_wait_rcfr_comp
);
4345 wait_for_completion(&conn
->conn_post_wait_comp
);
4346 spin_lock_bh(&conn
->state_lock
);
4348 atomic_set(&conn
->connection_reinstatement
, 1);
4349 spin_unlock_bh(&conn
->state_lock
);
4352 * If any other processes are accessing this connection pointer we
4353 * must wait until they have completed.
4355 iscsit_check_conn_usage_count(conn
);
4357 if (conn
->conn_rx_hash
.tfm
)
4358 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
4359 if (conn
->conn_tx_hash
.tfm
)
4360 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
4362 free_cpumask_var(conn
->conn_cpumask
);
4364 kfree(conn
->conn_ops
);
4365 conn
->conn_ops
= NULL
;
4368 sock_release(conn
->sock
);
4370 if (conn
->conn_transport
->iscsit_free_conn
)
4371 conn
->conn_transport
->iscsit_free_conn(conn
);
4373 iscsit_put_transport(conn
->conn_transport
);
4375 conn
->thread_set
= NULL
;
4377 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4378 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4381 spin_lock_bh(&sess
->conn_lock
);
4382 atomic_dec(&sess
->nconn
);
4383 pr_debug("Decremented iSCSI connection count to %hu from node:"
4384 " %s\n", atomic_read(&sess
->nconn
),
4385 sess
->sess_ops
->InitiatorName
);
4387 * Make sure that if one connection fails in an non ERL=2 iSCSI
4388 * Session that they all fail.
4390 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4391 !atomic_read(&sess
->session_logout
))
4392 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4395 * If this was not the last connection in the session, and we are
4396 * performing session reinstatement or falling back to ERL=0, call
4397 * iscsit_stop_session() without sleeping to shutdown the other
4398 * active connections.
4400 if (atomic_read(&sess
->nconn
)) {
4401 if (!atomic_read(&sess
->session_reinstatement
) &&
4402 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4403 spin_unlock_bh(&sess
->conn_lock
);
4406 if (!atomic_read(&sess
->session_stop_active
)) {
4407 atomic_set(&sess
->session_stop_active
, 1);
4408 spin_unlock_bh(&sess
->conn_lock
);
4409 iscsit_stop_session(sess
, 0, 0);
4412 spin_unlock_bh(&sess
->conn_lock
);
4417 * If this was the last connection in the session and one of the
4418 * following is occurring:
4420 * Session Reinstatement is not being performed, and are falling back
4421 * to ERL=0 call iscsit_close_session().
4423 * Session Logout was requested. iscsit_close_session() will be called
4426 * Session Continuation is not being performed, start the Time2Retain
4427 * handler and check if sleep_on_sess_wait_sem is active.
4429 if (!atomic_read(&sess
->session_reinstatement
) &&
4430 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4431 spin_unlock_bh(&sess
->conn_lock
);
4432 target_put_session(sess
->se_sess
);
4435 } else if (atomic_read(&sess
->session_logout
)) {
4436 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4437 sess
->session_state
= TARG_SESS_STATE_FREE
;
4438 spin_unlock_bh(&sess
->conn_lock
);
4440 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4441 complete(&sess
->session_wait_comp
);
4445 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4446 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4448 if (!atomic_read(&sess
->session_continuation
)) {
4449 spin_unlock_bh(&sess
->conn_lock
);
4450 iscsit_start_time2retain_handler(sess
);
4452 spin_unlock_bh(&sess
->conn_lock
);
4454 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4455 complete(&sess
->session_wait_comp
);
4459 spin_unlock_bh(&sess
->conn_lock
);
4464 int iscsit_close_session(struct iscsi_session
*sess
)
4466 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4467 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4469 if (atomic_read(&sess
->nconn
)) {
4470 pr_err("%d connection(s) still exist for iSCSI session"
4471 " to %s\n", atomic_read(&sess
->nconn
),
4472 sess
->sess_ops
->InitiatorName
);
4476 spin_lock_bh(&se_tpg
->session_lock
);
4477 atomic_set(&sess
->session_logout
, 1);
4478 atomic_set(&sess
->session_reinstatement
, 1);
4479 iscsit_stop_time2retain_timer(sess
);
4480 spin_unlock_bh(&se_tpg
->session_lock
);
4483 * transport_deregister_session_configfs() will clear the
4484 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4485 * can be setting it again with __transport_register_session() in
4486 * iscsi_post_login_handler() again after the iscsit_stop_session()
4487 * completes in iscsi_np context.
4489 transport_deregister_session_configfs(sess
->se_sess
);
4492 * If any other processes are accessing this session pointer we must
4493 * wait until they have completed. If we are in an interrupt (the
4494 * time2retain handler) and contain and active session usage count we
4495 * restart the timer and exit.
4497 if (!in_interrupt()) {
4498 if (iscsit_check_session_usage_count(sess
) == 1)
4499 iscsit_stop_session(sess
, 1, 1);
4501 if (iscsit_check_session_usage_count(sess
) == 2) {
4502 atomic_set(&sess
->session_logout
, 0);
4503 iscsit_start_time2retain_handler(sess
);
4508 transport_deregister_session(sess
->se_sess
);
4510 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4511 iscsit_free_connection_recovery_entires(sess
);
4513 iscsit_free_all_ooo_cmdsns(sess
);
4515 spin_lock_bh(&se_tpg
->session_lock
);
4516 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4517 sess
->session_state
= TARG_SESS_STATE_FREE
;
4518 pr_debug("Released iSCSI session from node: %s\n",
4519 sess
->sess_ops
->InitiatorName
);
4522 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4524 pr_debug("Decremented number of active iSCSI Sessions on"
4525 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4527 spin_lock(&sess_idr_lock
);
4528 idr_remove(&sess_idr
, sess
->session_index
);
4529 spin_unlock(&sess_idr_lock
);
4531 kfree(sess
->sess_ops
);
4532 sess
->sess_ops
= NULL
;
4533 spin_unlock_bh(&se_tpg
->session_lock
);
4539 static void iscsit_logout_post_handler_closesession(
4540 struct iscsi_conn
*conn
)
4542 struct iscsi_session
*sess
= conn
->sess
;
4544 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4545 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4547 atomic_set(&conn
->conn_logout_remove
, 0);
4548 complete(&conn
->conn_logout_comp
);
4550 iscsit_dec_conn_usage_count(conn
);
4551 iscsit_stop_session(sess
, 1, 1);
4552 iscsit_dec_session_usage_count(sess
);
4553 target_put_session(sess
->se_sess
);
4556 static void iscsit_logout_post_handler_samecid(
4557 struct iscsi_conn
*conn
)
4559 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4560 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4562 atomic_set(&conn
->conn_logout_remove
, 0);
4563 complete(&conn
->conn_logout_comp
);
4565 iscsit_cause_connection_reinstatement(conn
, 1);
4566 iscsit_dec_conn_usage_count(conn
);
4569 static void iscsit_logout_post_handler_diffcid(
4570 struct iscsi_conn
*conn
,
4573 struct iscsi_conn
*l_conn
;
4574 struct iscsi_session
*sess
= conn
->sess
;
4575 bool conn_found
= false;
4580 spin_lock_bh(&sess
->conn_lock
);
4581 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4582 if (l_conn
->cid
== cid
) {
4583 iscsit_inc_conn_usage_count(l_conn
);
4588 spin_unlock_bh(&sess
->conn_lock
);
4594 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4596 spin_lock_bh(&l_conn
->state_lock
);
4597 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4598 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4599 spin_unlock_bh(&l_conn
->state_lock
);
4601 iscsit_cause_connection_reinstatement(l_conn
, 1);
4602 iscsit_dec_conn_usage_count(l_conn
);
4606 * Return of 0 causes the TX thread to restart.
4608 int iscsit_logout_post_handler(
4609 struct iscsi_cmd
*cmd
,
4610 struct iscsi_conn
*conn
)
4614 switch (cmd
->logout_reason
) {
4615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4616 switch (cmd
->logout_response
) {
4617 case ISCSI_LOGOUT_SUCCESS
:
4618 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4620 iscsit_logout_post_handler_closesession(conn
);
4625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4626 if (conn
->cid
== cmd
->logout_cid
) {
4627 switch (cmd
->logout_response
) {
4628 case ISCSI_LOGOUT_SUCCESS
:
4629 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4631 iscsit_logout_post_handler_samecid(conn
);
4636 switch (cmd
->logout_response
) {
4637 case ISCSI_LOGOUT_SUCCESS
:
4638 iscsit_logout_post_handler_diffcid(conn
,
4641 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4642 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4649 case ISCSI_LOGOUT_REASON_RECOVERY
:
4650 switch (cmd
->logout_response
) {
4651 case ISCSI_LOGOUT_SUCCESS
:
4652 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4653 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4654 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4666 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4668 void iscsit_fail_session(struct iscsi_session
*sess
)
4670 struct iscsi_conn
*conn
;
4672 spin_lock_bh(&sess
->conn_lock
);
4673 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4674 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4675 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4677 spin_unlock_bh(&sess
->conn_lock
);
4679 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4680 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4683 int iscsit_free_session(struct iscsi_session
*sess
)
4685 u16 conn_count
= atomic_read(&sess
->nconn
);
4686 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4689 spin_lock_bh(&sess
->conn_lock
);
4690 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4692 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4694 if (conn_count
== 0)
4697 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4700 iscsit_inc_conn_usage_count(conn_tmp
);
4703 iscsit_inc_conn_usage_count(conn
);
4705 spin_unlock_bh(&sess
->conn_lock
);
4706 iscsit_cause_connection_reinstatement(conn
, 1);
4707 spin_lock_bh(&sess
->conn_lock
);
4709 iscsit_dec_conn_usage_count(conn
);
4711 iscsit_dec_conn_usage_count(conn_tmp
);
4716 if (atomic_read(&sess
->nconn
)) {
4717 spin_unlock_bh(&sess
->conn_lock
);
4718 wait_for_completion(&sess
->session_wait_comp
);
4720 spin_unlock_bh(&sess
->conn_lock
);
4722 target_put_session(sess
->se_sess
);
4726 void iscsit_stop_session(
4727 struct iscsi_session
*sess
,
4729 int connection_sleep
)
4731 u16 conn_count
= atomic_read(&sess
->nconn
);
4732 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4735 spin_lock_bh(&sess
->conn_lock
);
4737 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4739 if (connection_sleep
) {
4740 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4742 if (conn_count
== 0)
4745 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4748 iscsit_inc_conn_usage_count(conn_tmp
);
4751 iscsit_inc_conn_usage_count(conn
);
4753 spin_unlock_bh(&sess
->conn_lock
);
4754 iscsit_cause_connection_reinstatement(conn
, 1);
4755 spin_lock_bh(&sess
->conn_lock
);
4757 iscsit_dec_conn_usage_count(conn
);
4759 iscsit_dec_conn_usage_count(conn_tmp
);
4763 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4764 iscsit_cause_connection_reinstatement(conn
, 0);
4767 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4768 spin_unlock_bh(&sess
->conn_lock
);
4769 wait_for_completion(&sess
->session_wait_comp
);
4771 spin_unlock_bh(&sess
->conn_lock
);
4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4776 struct iscsi_session
*sess
;
4777 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4778 struct se_session
*se_sess
, *se_sess_tmp
;
4779 int session_count
= 0;
4781 spin_lock_bh(&se_tpg
->session_lock
);
4782 if (tpg
->nsessions
&& !force
) {
4783 spin_unlock_bh(&se_tpg
->session_lock
);
4787 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4789 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4791 spin_lock(&sess
->conn_lock
);
4792 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4793 atomic_read(&sess
->session_logout
) ||
4794 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4795 spin_unlock(&sess
->conn_lock
);
4798 atomic_set(&sess
->session_reinstatement
, 1);
4799 spin_unlock(&sess
->conn_lock
);
4800 spin_unlock_bh(&se_tpg
->session_lock
);
4802 iscsit_free_session(sess
);
4803 spin_lock_bh(&se_tpg
->session_lock
);
4807 spin_unlock_bh(&se_tpg
->session_lock
);
4809 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4810 " Group: %hu\n", session_count
, tpg
->tpgt
);
4814 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4815 MODULE_VERSION("4.1.x");
4816 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4817 MODULE_LICENSE("GPL");
4819 module_init(iscsi_target_init_module
);
4820 module_exit(iscsi_target_cleanup_module
);