1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/completion.h>
25 #include <linux/module.h>
26 #include <linux/idr.h>
27 #include <asm/unaligned.h>
28 #include <scsi/scsi_device.h>
29 #include <scsi/iscsi_proto.h>
30 #include <scsi/scsi_tcq.h>
31 #include <target/target_core_base.h>
32 #include <target/target_core_fabric.h>
33 #include <target/target_core_configfs.h>
35 #include "iscsi_target_core.h"
36 #include "iscsi_target_parameters.h"
37 #include "iscsi_target_seq_pdu_list.h"
38 #include "iscsi_target_tq.h"
39 #include "iscsi_target_configfs.h"
40 #include "iscsi_target_datain_values.h"
41 #include "iscsi_target_erl0.h"
42 #include "iscsi_target_erl1.h"
43 #include "iscsi_target_erl2.h"
44 #include "iscsi_target_login.h"
45 #include "iscsi_target_tmr.h"
46 #include "iscsi_target_tpg.h"
47 #include "iscsi_target_util.h"
48 #include "iscsi_target.h"
49 #include "iscsi_target_device.h"
50 #include "iscsi_target_stat.h"
52 static LIST_HEAD(g_tiqn_list
);
53 static LIST_HEAD(g_np_list
);
54 static DEFINE_SPINLOCK(tiqn_lock
);
55 static DEFINE_SPINLOCK(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_cmd_cache
;
65 struct kmem_cache
*lio_qr_cache
;
66 struct kmem_cache
*lio_dr_cache
;
67 struct kmem_cache
*lio_ooo_cache
;
68 struct kmem_cache
*lio_r2t_cache
;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd
*,
71 unsigned char *buf
, u32
);
72 static int iscsit_logout_post_handler(struct iscsi_cmd
*, struct iscsi_conn
*);
74 struct iscsi_tiqn
*iscsit_get_tiqn_for_login(unsigned char *buf
)
76 struct iscsi_tiqn
*tiqn
= NULL
;
78 spin_lock(&tiqn_lock
);
79 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
80 if (!strcmp(tiqn
->tiqn
, buf
)) {
82 spin_lock(&tiqn
->tiqn_state_lock
);
83 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
84 tiqn
->tiqn_access_count
++;
85 spin_unlock(&tiqn
->tiqn_state_lock
);
86 spin_unlock(&tiqn_lock
);
89 spin_unlock(&tiqn
->tiqn_state_lock
);
92 spin_unlock(&tiqn_lock
);
97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn
*tiqn
)
99 spin_lock(&tiqn
->tiqn_state_lock
);
100 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
101 tiqn
->tiqn_state
= TIQN_STATE_SHUTDOWN
;
102 spin_unlock(&tiqn
->tiqn_state_lock
);
105 spin_unlock(&tiqn
->tiqn_state_lock
);
110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn
*tiqn
)
112 spin_lock(&tiqn
->tiqn_state_lock
);
113 tiqn
->tiqn_access_count
--;
114 spin_unlock(&tiqn
->tiqn_state_lock
);
118 * Note that IQN formatting is expected to be done in userspace, and
119 * no explict IQN format checks are done here.
121 struct iscsi_tiqn
*iscsit_add_tiqn(unsigned char *buf
)
123 struct iscsi_tiqn
*tiqn
= NULL
;
126 if (strlen(buf
) >= ISCSI_IQN_LEN
) {
127 pr_err("Target IQN exceeds %d bytes\n",
129 return ERR_PTR(-EINVAL
);
132 tiqn
= kzalloc(sizeof(struct iscsi_tiqn
), GFP_KERNEL
);
134 pr_err("Unable to allocate struct iscsi_tiqn\n");
135 return ERR_PTR(-ENOMEM
);
138 sprintf(tiqn
->tiqn
, "%s", buf
);
139 INIT_LIST_HEAD(&tiqn
->tiqn_list
);
140 INIT_LIST_HEAD(&tiqn
->tiqn_tpg_list
);
141 spin_lock_init(&tiqn
->tiqn_state_lock
);
142 spin_lock_init(&tiqn
->tiqn_tpg_lock
);
143 spin_lock_init(&tiqn
->sess_err_stats
.lock
);
144 spin_lock_init(&tiqn
->login_stats
.lock
);
145 spin_lock_init(&tiqn
->logout_stats
.lock
);
147 if (!idr_pre_get(&tiqn_idr
, GFP_KERNEL
)) {
148 pr_err("idr_pre_get() for tiqn_idr failed\n");
150 return ERR_PTR(-ENOMEM
);
152 tiqn
->tiqn_state
= TIQN_STATE_ACTIVE
;
154 spin_lock(&tiqn_lock
);
155 ret
= idr_get_new(&tiqn_idr
, NULL
, &tiqn
->tiqn_index
);
157 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
158 spin_unlock(&tiqn_lock
);
162 list_add_tail(&tiqn
->tiqn_list
, &g_tiqn_list
);
163 spin_unlock(&tiqn_lock
);
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn
->tiqn
);
171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn
*tiqn
)
174 * Wait for accesses to said struct iscsi_tiqn to end.
176 spin_lock(&tiqn
->tiqn_state_lock
);
177 while (tiqn
->tiqn_access_count
!= 0) {
178 spin_unlock(&tiqn
->tiqn_state_lock
);
180 spin_lock(&tiqn
->tiqn_state_lock
);
182 spin_unlock(&tiqn
->tiqn_state_lock
);
185 void iscsit_del_tiqn(struct iscsi_tiqn
*tiqn
)
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
193 if (iscsit_set_tiqn_shutdown(tiqn
) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
198 iscsit_wait_for_tiqn(tiqn
);
200 spin_lock(&tiqn_lock
);
201 list_del(&tiqn
->tiqn_list
);
202 idr_remove(&tiqn_idr
, tiqn
->tiqn_index
);
203 spin_unlock(&tiqn_lock
);
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
210 int iscsit_access_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
)
214 * Determine if the network portal is accepting storage traffic.
216 spin_lock_bh(&np
->np_thread_lock
);
217 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
218 spin_unlock_bh(&np
->np_thread_lock
);
221 if (np
->np_login_tpg
) {
222 pr_err("np->np_login_tpg() is not NULL!\n");
223 spin_unlock_bh(&np
->np_thread_lock
);
226 spin_unlock_bh(&np
->np_thread_lock
);
228 * Determine if the portal group is accepting storage traffic.
230 spin_lock_bh(&tpg
->tpg_state_lock
);
231 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
232 spin_unlock_bh(&tpg
->tpg_state_lock
);
235 spin_unlock_bh(&tpg
->tpg_state_lock
);
238 * Here we serialize access across the TIQN+TPG Tuple.
240 ret
= mutex_lock_interruptible(&tpg
->np_login_lock
);
241 if ((ret
!= 0) || signal_pending(current
))
244 spin_lock_bh(&np
->np_thread_lock
);
245 np
->np_login_tpg
= tpg
;
246 spin_unlock_bh(&np
->np_thread_lock
);
251 int iscsit_deaccess_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
)
253 struct iscsi_tiqn
*tiqn
= tpg
->tpg_tiqn
;
255 spin_lock_bh(&np
->np_thread_lock
);
256 np
->np_login_tpg
= NULL
;
257 spin_unlock_bh(&np
->np_thread_lock
);
259 mutex_unlock(&tpg
->np_login_lock
);
262 iscsit_put_tiqn_for_login(tiqn
);
267 static struct iscsi_np
*iscsit_get_np(
268 struct __kernel_sockaddr_storage
*sockaddr
,
269 int network_transport
)
271 struct sockaddr_in
*sock_in
, *sock_in_e
;
272 struct sockaddr_in6
*sock_in6
, *sock_in6_e
;
277 spin_lock_bh(&np_lock
);
278 list_for_each_entry(np
, &g_np_list
, np_list
) {
279 spin_lock(&np
->np_thread_lock
);
280 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
281 spin_unlock(&np
->np_thread_lock
);
285 if (sockaddr
->ss_family
== AF_INET6
) {
286 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
287 sock_in6_e
= (struct sockaddr_in6
*)&np
->np_sockaddr
;
289 if (!memcmp(&sock_in6
->sin6_addr
.in6_u
,
290 &sock_in6_e
->sin6_addr
.in6_u
,
291 sizeof(struct in6_addr
)))
294 port
= ntohs(sock_in6
->sin6_port
);
296 sock_in
= (struct sockaddr_in
*)sockaddr
;
297 sock_in_e
= (struct sockaddr_in
*)&np
->np_sockaddr
;
299 if (sock_in
->sin_addr
.s_addr
==
300 sock_in_e
->sin_addr
.s_addr
)
303 port
= ntohs(sock_in
->sin_port
);
306 if ((ip_match
== 1) && (np
->np_port
== port
) &&
307 (np
->np_network_transport
== network_transport
)) {
309 * Increment the np_exports reference count now to
310 * prevent iscsit_del_np() below from being called
311 * while iscsi_tpg_add_network_portal() is called.
314 spin_unlock(&np
->np_thread_lock
);
315 spin_unlock_bh(&np_lock
);
318 spin_unlock(&np
->np_thread_lock
);
320 spin_unlock_bh(&np_lock
);
325 struct iscsi_np
*iscsit_add_np(
326 struct __kernel_sockaddr_storage
*sockaddr
,
328 int network_transport
)
330 struct sockaddr_in
*sock_in
;
331 struct sockaddr_in6
*sock_in6
;
335 * Locate the existing struct iscsi_np if already active..
337 np
= iscsit_get_np(sockaddr
, network_transport
);
341 np
= kzalloc(sizeof(struct iscsi_np
), GFP_KERNEL
);
343 pr_err("Unable to allocate memory for struct iscsi_np\n");
344 return ERR_PTR(-ENOMEM
);
347 np
->np_flags
|= NPF_IP_NETWORK
;
348 if (sockaddr
->ss_family
== AF_INET6
) {
349 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
350 snprintf(np
->np_ip
, IPV6_ADDRESS_SPACE
, "%s", ip_str
);
351 np
->np_port
= ntohs(sock_in6
->sin6_port
);
353 sock_in
= (struct sockaddr_in
*)sockaddr
;
354 sprintf(np
->np_ip
, "%s", ip_str
);
355 np
->np_port
= ntohs(sock_in
->sin_port
);
358 np
->np_network_transport
= network_transport
;
359 spin_lock_init(&np
->np_thread_lock
);
360 init_completion(&np
->np_restart_comp
);
361 INIT_LIST_HEAD(&np
->np_list
);
363 ret
= iscsi_target_setup_login_socket(np
, sockaddr
);
369 np
->np_thread
= kthread_run(iscsi_target_login_thread
, np
, "iscsi_np");
370 if (IS_ERR(np
->np_thread
)) {
371 pr_err("Unable to create kthread: iscsi_np\n");
372 ret
= PTR_ERR(np
->np_thread
);
377 * Increment the np_exports reference count now to prevent
378 * iscsit_del_np() below from being run while a new call to
379 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
380 * active. We don't need to hold np->np_thread_lock at this
381 * point because iscsi_np has not been added to g_np_list yet.
385 spin_lock_bh(&np_lock
);
386 list_add_tail(&np
->np_list
, &g_np_list
);
387 spin_unlock_bh(&np_lock
);
389 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
390 np
->np_ip
, np
->np_port
, (np
->np_network_transport
== ISCSI_TCP
) ?
396 int iscsit_reset_np_thread(
398 struct iscsi_tpg_np
*tpg_np
,
399 struct iscsi_portal_group
*tpg
)
401 spin_lock_bh(&np
->np_thread_lock
);
404 * The reset operation need only be performed when the
405 * passed struct iscsi_portal_group has a login in progress
406 * to one of the network portals.
408 if (tpg_np
->tpg_np
->np_login_tpg
!= tpg
) {
409 spin_unlock_bh(&np
->np_thread_lock
);
413 if (np
->np_thread_state
== ISCSI_NP_THREAD_INACTIVE
) {
414 spin_unlock_bh(&np
->np_thread_lock
);
417 np
->np_thread_state
= ISCSI_NP_THREAD_RESET
;
420 spin_unlock_bh(&np
->np_thread_lock
);
421 send_sig(SIGINT
, np
->np_thread
, 1);
422 wait_for_completion(&np
->np_restart_comp
);
423 spin_lock_bh(&np
->np_thread_lock
);
425 spin_unlock_bh(&np
->np_thread_lock
);
430 static int iscsit_del_np_comm(struct iscsi_np
*np
)
433 sock_release(np
->np_socket
);
437 int iscsit_del_np(struct iscsi_np
*np
)
439 spin_lock_bh(&np
->np_thread_lock
);
441 if (np
->np_exports
) {
442 spin_unlock_bh(&np
->np_thread_lock
);
445 np
->np_thread_state
= ISCSI_NP_THREAD_SHUTDOWN
;
446 spin_unlock_bh(&np
->np_thread_lock
);
450 * We need to send the signal to wakeup Linux/Net
451 * which may be sleeping in sock_accept()..
453 send_sig(SIGINT
, np
->np_thread
, 1);
454 kthread_stop(np
->np_thread
);
456 iscsit_del_np_comm(np
);
458 spin_lock_bh(&np_lock
);
459 list_del(&np
->np_list
);
460 spin_unlock_bh(&np_lock
);
462 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
463 np
->np_ip
, np
->np_port
, (np
->np_network_transport
== ISCSI_TCP
) ?
470 static int __init
iscsi_target_init_module(void)
474 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
476 iscsit_global
= kzalloc(sizeof(struct iscsit_global
), GFP_KERNEL
);
477 if (!iscsit_global
) {
478 pr_err("Unable to allocate memory for iscsit_global\n");
481 mutex_init(&auth_id_lock
);
482 spin_lock_init(&sess_idr_lock
);
486 ret
= iscsi_target_register_configfs();
490 ret
= iscsi_thread_set_init();
494 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT
) !=
495 TARGET_THREAD_SET_COUNT
) {
496 pr_err("iscsi_allocate_thread_sets() returned"
497 " unexpected value!\n");
501 lio_cmd_cache
= kmem_cache_create("lio_cmd_cache",
502 sizeof(struct iscsi_cmd
), __alignof__(struct iscsi_cmd
),
504 if (!lio_cmd_cache
) {
505 pr_err("Unable to kmem_cache_create() for"
510 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
511 sizeof(struct iscsi_queue_req
),
512 __alignof__(struct iscsi_queue_req
), 0, NULL
);
514 pr_err("nable to kmem_cache_create() for"
519 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
520 sizeof(struct iscsi_datain_req
),
521 __alignof__(struct iscsi_datain_req
), 0, NULL
);
523 pr_err("Unable to kmem_cache_create() for"
528 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
529 sizeof(struct iscsi_ooo_cmdsn
),
530 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
531 if (!lio_ooo_cache
) {
532 pr_err("Unable to kmem_cache_create() for"
537 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
538 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
540 if (!lio_r2t_cache
) {
541 pr_err("Unable to kmem_cache_create() for"
546 if (iscsit_load_discovery_tpg() < 0)
551 kmem_cache_destroy(lio_r2t_cache
);
553 kmem_cache_destroy(lio_ooo_cache
);
555 kmem_cache_destroy(lio_dr_cache
);
557 kmem_cache_destroy(lio_qr_cache
);
559 kmem_cache_destroy(lio_cmd_cache
);
561 iscsi_deallocate_thread_sets();
563 iscsi_thread_set_free();
565 iscsi_target_deregister_configfs();
567 kfree(iscsit_global
);
571 static void __exit
iscsi_target_cleanup_module(void)
573 iscsi_deallocate_thread_sets();
574 iscsi_thread_set_free();
575 iscsit_release_discovery_tpg();
576 kmem_cache_destroy(lio_cmd_cache
);
577 kmem_cache_destroy(lio_qr_cache
);
578 kmem_cache_destroy(lio_dr_cache
);
579 kmem_cache_destroy(lio_ooo_cache
);
580 kmem_cache_destroy(lio_r2t_cache
);
582 iscsi_target_deregister_configfs();
584 kfree(iscsit_global
);
587 static int iscsit_add_reject(
591 struct iscsi_conn
*conn
)
593 struct iscsi_cmd
*cmd
;
594 struct iscsi_reject
*hdr
;
597 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
601 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
603 cmd
->cmd_flags
|= ICF_REJECT_FAIL_CONN
;
605 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
606 hdr
->reason
= reason
;
608 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
610 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
611 iscsit_release_cmd(cmd
);
615 spin_lock_bh(&conn
->cmd_lock
);
616 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
617 spin_unlock_bh(&conn
->cmd_lock
);
619 cmd
->i_state
= ISTATE_SEND_REJECT
;
620 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
622 ret
= wait_for_completion_interruptible(&cmd
->reject_comp
);
626 return (!fail_conn
) ? 0 : -1;
629 int iscsit_add_reject_from_cmd(
634 struct iscsi_cmd
*cmd
)
636 struct iscsi_conn
*conn
;
637 struct iscsi_reject
*hdr
;
641 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
647 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
649 cmd
->cmd_flags
|= ICF_REJECT_FAIL_CONN
;
651 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
652 hdr
->reason
= reason
;
654 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
656 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
657 iscsit_release_cmd(cmd
);
662 spin_lock_bh(&conn
->cmd_lock
);
663 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
664 spin_unlock_bh(&conn
->cmd_lock
);
667 cmd
->i_state
= ISTATE_SEND_REJECT
;
668 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
670 ret
= wait_for_completion_interruptible(&cmd
->reject_comp
);
674 return (!fail_conn
) ? 0 : -1;
678 * Map some portion of the allocated scatterlist to an iovec, suitable for
679 * kernel sockets to copy data in/out.
681 static int iscsit_map_iovec(
682 struct iscsi_cmd
*cmd
,
688 struct scatterlist
*sg
;
689 unsigned int page_off
;
692 * We know each entry in t_data_sg contains a page.
694 sg
= &cmd
->se_cmd
.t_data_sg
[data_offset
/ PAGE_SIZE
];
695 page_off
= (data_offset
% PAGE_SIZE
);
697 cmd
->first_data_sg
= sg
;
698 cmd
->first_data_sg_off
= page_off
;
700 while (data_length
) {
701 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
703 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
704 iov
[i
].iov_len
= cur_len
;
706 data_length
-= cur_len
;
712 cmd
->kmapped_nents
= i
;
717 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
720 struct scatterlist
*sg
;
722 sg
= cmd
->first_data_sg
;
724 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
725 kunmap(sg_page(&sg
[i
]));
728 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
730 struct iscsi_cmd
*cmd
;
732 conn
->exp_statsn
= exp_statsn
;
734 spin_lock_bh(&conn
->cmd_lock
);
735 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
736 spin_lock(&cmd
->istate_lock
);
737 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
738 iscsi_sna_lt(cmd
->stat_sn
, exp_statsn
)) {
739 cmd
->i_state
= ISTATE_REMOVE
;
740 spin_unlock(&cmd
->istate_lock
);
741 iscsit_add_cmd_to_immediate_queue(cmd
, conn
,
745 spin_unlock(&cmd
->istate_lock
);
747 spin_unlock_bh(&conn
->cmd_lock
);
750 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
752 u32 iov_count
= max(1UL, DIV_ROUND_UP(cmd
->se_cmd
.data_length
, PAGE_SIZE
));
754 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
756 cmd
->iov_data
= kzalloc(iov_count
* sizeof(struct kvec
), GFP_KERNEL
);
757 if (!cmd
->iov_data
) {
758 pr_err("Unable to allocate cmd->iov_data\n");
762 cmd
->orig_iov_data_count
= iov_count
;
766 static int iscsit_handle_scsi_cmd(
767 struct iscsi_conn
*conn
,
770 int data_direction
, payload_length
, cmdsn_ret
= 0, immed_ret
;
771 struct iscsi_cmd
*cmd
= NULL
;
772 struct iscsi_scsi_req
*hdr
;
776 spin_lock_bh(&conn
->sess
->session_stats_lock
);
777 conn
->sess
->cmd_pdus
++;
778 if (conn
->sess
->se_sess
->se_node_acl
) {
779 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
780 conn
->sess
->se_sess
->se_node_acl
->num_cmds
++;
781 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
783 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
785 hdr
= (struct iscsi_scsi_req
*) buf
;
786 payload_length
= ntoh24(hdr
->dlength
);
788 /* FIXME; Add checks for AdditionalHeaderSegment */
790 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
791 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
792 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
793 " not set. Bad iSCSI Initiator.\n");
794 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
798 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
799 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
801 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
802 * that adds support for RESERVE/RELEASE. There is a bug
803 * add with this new functionality that sets R/W bits when
804 * neither CDB carries any READ or WRITE datapayloads.
806 if ((hdr
->cdb
[0] == 0x16) || (hdr
->cdb
[0] == 0x17)) {
807 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
808 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
812 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
813 " set when Expected Data Transfer Length is 0 for"
814 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr
->cdb
[0]);
815 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
820 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
821 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
822 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
823 " MUST be set if Expected Data Transfer Length is not 0."
824 " Bad iSCSI Initiator\n");
825 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
829 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
830 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
831 pr_err("Bidirectional operations not supported!\n");
832 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
836 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
837 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
838 " Scsi Command PDU.\n");
839 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
843 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
844 pr_err("ImmediateData=No but DataSegmentLength=%u,"
845 " protocol error.\n", payload_length
);
846 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
850 if ((be32_to_cpu(hdr
->data_length
)== payload_length
) &&
851 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
852 pr_err("Expected Data Transfer Length and Length of"
853 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
854 " bit is not set protocol error\n");
855 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
859 if (payload_length
> be32_to_cpu(hdr
->data_length
)) {
860 pr_err("DataSegmentLength: %u is greater than"
861 " EDTL: %u, protocol error.\n", payload_length
,
863 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
867 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
868 pr_err("DataSegmentLength: %u is greater than"
869 " MaxXmitDataSegmentLength: %u, protocol error.\n",
870 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
871 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
875 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
876 pr_err("DataSegmentLength: %u is greater than"
877 " FirstBurstLength: %u, protocol error.\n",
878 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
879 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
883 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
884 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
887 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
889 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
, 1,
892 cmd
->data_direction
= data_direction
;
893 iscsi_task_attr
= hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
;
895 * Figure out the SAM Task Attribute for the incoming SCSI CDB
897 if ((iscsi_task_attr
== ISCSI_ATTR_UNTAGGED
) ||
898 (iscsi_task_attr
== ISCSI_ATTR_SIMPLE
))
899 sam_task_attr
= MSG_SIMPLE_TAG
;
900 else if (iscsi_task_attr
== ISCSI_ATTR_ORDERED
)
901 sam_task_attr
= MSG_ORDERED_TAG
;
902 else if (iscsi_task_attr
== ISCSI_ATTR_HEAD_OF_QUEUE
)
903 sam_task_attr
= MSG_HEAD_TAG
;
904 else if (iscsi_task_attr
== ISCSI_ATTR_ACA
)
905 sam_task_attr
= MSG_ACA_TAG
;
907 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
908 " MSG_SIMPLE_TAG\n", iscsi_task_attr
);
909 sam_task_attr
= MSG_SIMPLE_TAG
;
912 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
913 cmd
->i_state
= ISTATE_NEW_CMD
;
914 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
915 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
916 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
917 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
918 if (cmd
->unsolicited_data
)
919 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
921 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
922 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
) {
923 spin_lock_bh(&conn
->sess
->ttt_lock
);
924 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
925 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
926 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
927 spin_unlock_bh(&conn
->sess
->ttt_lock
);
928 } else if (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)
929 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
930 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
931 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
932 cmd
->first_burst_len
= payload_length
;
934 if (cmd
->data_direction
== DMA_FROM_DEVICE
) {
935 struct iscsi_datain_req
*dr
;
937 dr
= iscsit_allocate_datain_req();
939 return iscsit_add_reject_from_cmd(
940 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
943 iscsit_attach_datain_req(cmd
, dr
);
947 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
949 transport_init_se_cmd(&cmd
->se_cmd
, &lio_target_fabric_configfs
->tf_ops
,
950 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
951 cmd
->data_direction
, sam_task_attr
,
952 cmd
->sense_buffer
+ 2);
954 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
955 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
956 hdr
->cmdsn
, hdr
->data_length
, payload_length
, conn
->cid
);
958 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
959 scsilun_to_int(&hdr
->lun
));
960 if (cmd
->sense_reason
)
963 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
964 if (cmd
->sense_reason
) {
965 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
966 return iscsit_add_reject_from_cmd(
967 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
974 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
975 return iscsit_add_reject_from_cmd(
976 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
981 spin_lock_bh(&conn
->cmd_lock
);
982 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
983 spin_unlock_bh(&conn
->cmd_lock
);
985 * Check if we need to delay processing because of ALUA
986 * Active/NonOptimized primary access state..
988 core_alua_check_nonop_delay(&cmd
->se_cmd
);
990 if (iscsit_allocate_iovecs(cmd
) < 0) {
991 return iscsit_add_reject_from_cmd(
992 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
997 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
998 * the Immediate Bit is not set, and no Immediate
1001 * A PDU/CmdSN carrying Immediate Data can only
1002 * be processed after the DataCRC has passed.
1003 * If the DataCRC fails, the CmdSN MUST NOT
1004 * be acknowledged. (See below)
1006 if (!cmd
->immediate_data
) {
1007 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1008 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1010 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1011 return iscsit_add_reject_from_cmd(
1012 ISCSI_REASON_PROTOCOL_ERROR
,
1016 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1019 * If no Immediate Data is attached, it's OK to return now.
1021 if (!cmd
->immediate_data
) {
1022 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
) {
1023 iscsit_set_dataout_sequence_values(cmd
);
1025 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1026 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1027 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1034 * Early CHECK_CONDITIONs never make it to the transport processing
1035 * thread. They are processed in CmdSN order by
1036 * iscsit_check_received_cmdsn() below.
1038 if (cmd
->sense_reason
) {
1039 immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1040 goto after_immediate_data
;
1043 * Call directly into transport_generic_new_cmd() to perform
1044 * the backend memory allocation.
1046 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1047 if (cmd
->sense_reason
) {
1048 immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1049 goto after_immediate_data
;
1052 immed_ret
= iscsit_handle_immediate_data(cmd
, buf
, payload_length
);
1053 after_immediate_data
:
1054 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1056 * A PDU/CmdSN carrying Immediate Data passed
1057 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1058 * Immediate Bit is not set.
1060 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1062 * Special case for Unsupported SAM WRITE Opcodes
1063 * and ImmediateData=Yes.
1065 if (cmd
->sense_reason
) {
1066 if (iscsit_dump_data_payload(conn
, payload_length
, 1) < 0)
1068 } else if (cmd
->unsolicited_data
) {
1069 iscsit_set_dataout_sequence_values(cmd
);
1071 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1072 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1073 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1076 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1077 return iscsit_add_reject_from_cmd(
1078 ISCSI_REASON_PROTOCOL_ERROR
,
1081 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1083 * Immediate Data failed DataCRC and ERL>=1,
1084 * silently drop this PDU and let the initiator
1085 * plug the CmdSN gap.
1087 * FIXME: Send Unsolicited NOPIN with reserved
1088 * TTT here to help the initiator figure out
1089 * the missing CmdSN, although they should be
1090 * intelligent enough to determine the missing
1091 * CmdSN and issue a retry to plug the sequence.
1093 cmd
->i_state
= ISTATE_REMOVE
;
1094 iscsit_add_cmd_to_immediate_queue(cmd
, conn
, cmd
->i_state
);
1095 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1101 static u32
iscsit_do_crypto_hash_sg(
1102 struct hash_desc
*hash
,
1103 struct iscsi_cmd
*cmd
,
1111 struct scatterlist
*sg
;
1112 unsigned int page_off
;
1114 crypto_hash_init(hash
);
1116 sg
= cmd
->first_data_sg
;
1117 page_off
= cmd
->first_data_sg_off
;
1120 while (data_length
) {
1121 u32 cur_len
= min_t(u32
, data_length
, (sg
[i
].length
- page_off
));
1123 crypto_hash_update(hash
, &sg
[i
], cur_len
);
1125 data_length
-= cur_len
;
1131 struct scatterlist pad_sg
;
1133 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1134 crypto_hash_update(hash
, &pad_sg
, padding
);
1136 crypto_hash_final(hash
, (u8
*) &data_crc
);
1141 static void iscsit_do_crypto_hash_buf(
1142 struct hash_desc
*hash
,
1149 struct scatterlist sg
;
1151 crypto_hash_init(hash
);
1153 sg_init_one(&sg
, buf
, payload_length
);
1154 crypto_hash_update(hash
, &sg
, payload_length
);
1157 sg_init_one(&sg
, pad_bytes
, padding
);
1158 crypto_hash_update(hash
, &sg
, padding
);
1160 crypto_hash_final(hash
, data_crc
);
1163 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1165 int iov_ret
, ooo_cmdsn
= 0, ret
;
1166 u8 data_crc_failed
= 0;
1167 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0;
1168 u32 rx_size
= 0, payload_length
;
1169 struct iscsi_cmd
*cmd
= NULL
;
1170 struct se_cmd
*se_cmd
;
1171 struct iscsi_data
*hdr
;
1173 unsigned long flags
;
1175 hdr
= (struct iscsi_data
*) buf
;
1176 payload_length
= ntoh24(hdr
->dlength
);
1178 if (!payload_length
) {
1179 pr_err("DataOUT payload is ZERO, protocol error.\n");
1180 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1185 spin_lock_bh(&conn
->sess
->session_stats_lock
);
1186 conn
->sess
->rx_data_octets
+= payload_length
;
1187 if (conn
->sess
->se_sess
->se_node_acl
) {
1188 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
1189 conn
->sess
->se_sess
->se_node_acl
->write_bytes
+= payload_length
;
1190 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
1192 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
1194 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1195 pr_err("DataSegmentLength: %u is greater than"
1196 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1197 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1198 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1202 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
,
1207 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1208 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1209 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, hdr
->offset
,
1210 payload_length
, conn
->cid
);
1212 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1213 pr_err("Command ITT: 0x%08x received DataOUT after"
1214 " last DataOUT received, dumping payload\n",
1215 cmd
->init_task_tag
);
1216 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1219 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1220 pr_err("Command ITT: 0x%08x received DataOUT for a"
1221 " NON-WRITE command.\n", cmd
->init_task_tag
);
1222 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR
,
1225 se_cmd
= &cmd
->se_cmd
;
1226 iscsit_mod_dataout_timer(cmd
);
1228 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1229 pr_err("DataOut Offset: %u, Length %u greater than"
1230 " iSCSI Command EDTL %u, protocol error.\n",
1231 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1232 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID
,
1236 if (cmd
->unsolicited_data
) {
1237 int dump_unsolicited_data
= 0;
1239 if (conn
->sess
->sess_ops
->InitialR2T
) {
1240 pr_err("Received unexpected unsolicited data"
1241 " while InitialR2T=Yes, protocol error.\n");
1242 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1243 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1247 * Special case for dealing with Unsolicited DataOUT
1248 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1252 /* Something's amiss if we're not in WRITE_PENDING state... */
1253 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1254 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1255 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1257 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1258 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1259 dump_unsolicited_data
= 1;
1260 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1262 if (dump_unsolicited_data
) {
1264 * Check if a delayed TASK_ABORTED status needs to
1265 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1266 * received with the unsolicitied data out.
1268 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1269 iscsit_stop_dataout_timer(cmd
);
1271 transport_check_aborted_status(se_cmd
,
1272 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1273 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1277 * For the normal solicited data path:
1279 * Check for a delayed TASK_ABORTED status and dump any
1280 * incoming data out payload if one exists. Also, when the
1281 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1282 * data out sequence, we decrement outstanding_r2ts. Once
1283 * outstanding_r2ts reaches zero, go ahead and send the delayed
1284 * TASK_ABORTED status.
1286 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1287 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1288 if (--cmd
->outstanding_r2ts
< 1) {
1289 iscsit_stop_dataout_timer(cmd
);
1290 transport_check_aborted_status(
1294 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1298 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1299 * within-command recovery checks before receiving the payload.
1301 ret
= iscsit_check_pre_dataout(cmd
, buf
);
1302 if (ret
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1304 else if (ret
== DATAOUT_CANNOT_RECOVER
)
1307 rx_size
+= payload_length
;
1308 iov
= &cmd
->iov_data
[0];
1310 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1315 iov_count
+= iov_ret
;
1317 padding
= ((-payload_length
) & 3);
1319 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1320 iov
[iov_count
++].iov_len
= padding
;
1322 pr_debug("Receiving %u padding bytes.\n", padding
);
1325 if (conn
->conn_ops
->DataDigest
) {
1326 iov
[iov_count
].iov_base
= &checksum
;
1327 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1328 rx_size
+= ISCSI_CRC_LEN
;
1331 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1333 iscsit_unmap_iovec(cmd
);
1335 if (rx_got
!= rx_size
)
1338 if (conn
->conn_ops
->DataDigest
) {
1341 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
1342 be32_to_cpu(hdr
->offset
),
1343 payload_length
, padding
,
1346 if (checksum
!= data_crc
) {
1347 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1348 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1349 " does not match computed 0x%08x\n",
1350 hdr
->itt
, hdr
->offset
, payload_length
,
1351 hdr
->datasn
, checksum
, data_crc
);
1352 data_crc_failed
= 1;
1354 pr_debug("Got CRC32C DataDigest 0x%08x for"
1355 " %u bytes of Data Out\n", checksum
,
1360 * Increment post receive data and CRC values or perform
1361 * within-command recovery.
1363 ret
= iscsit_check_post_dataout(cmd
, buf
, data_crc_failed
);
1364 if ((ret
== DATAOUT_NORMAL
) || (ret
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1366 else if (ret
== DATAOUT_SEND_R2T
) {
1367 iscsit_set_dataout_sequence_values(cmd
);
1368 iscsit_build_r2ts_for_cmd(cmd
, conn
, false);
1369 } else if (ret
== DATAOUT_SEND_TO_TRANSPORT
) {
1371 * Handle extra special case for out of order
1372 * Unsolicited Data Out.
1374 spin_lock_bh(&cmd
->istate_lock
);
1375 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1376 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1377 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1378 spin_unlock_bh(&cmd
->istate_lock
);
1380 iscsit_stop_dataout_timer(cmd
);
1383 target_execute_cmd(&cmd
->se_cmd
);
1385 } else /* DATAOUT_CANNOT_RECOVER */
1391 static int iscsit_handle_nop_out(
1392 struct iscsi_conn
*conn
,
1395 unsigned char *ping_data
= NULL
;
1396 int cmdsn_ret
, niov
= 0, ret
= 0, rx_got
, rx_size
;
1397 u32 checksum
, data_crc
, padding
= 0, payload_length
;
1398 struct iscsi_cmd
*cmd
= NULL
;
1399 struct kvec
*iov
= NULL
;
1400 struct iscsi_nopout
*hdr
;
1402 hdr
= (struct iscsi_nopout
*) buf
;
1403 payload_length
= ntoh24(hdr
->dlength
);
1405 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1406 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1407 " not set, protocol error.\n");
1408 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1412 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1413 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1414 " greater than MaxXmitDataSegmentLength: %u, protocol"
1415 " error.\n", payload_length
,
1416 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1417 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1421 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1422 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1423 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1424 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1427 * This is not a response to a Unsolicited NopIN, which means
1428 * it can either be a NOPOUT ping request (with a valid ITT),
1429 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1430 * Either way, make sure we allocate an struct iscsi_cmd, as both
1431 * can contain ping data.
1433 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1434 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
1436 return iscsit_add_reject(
1437 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1440 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1441 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1442 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1444 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1445 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1446 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1447 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1448 cmd
->data_direction
= DMA_NONE
;
1451 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1452 rx_size
= payload_length
;
1453 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1455 pr_err("Unable to allocate memory for"
1456 " NOPOUT ping data.\n");
1461 iov
= &cmd
->iov_misc
[0];
1462 iov
[niov
].iov_base
= ping_data
;
1463 iov
[niov
++].iov_len
= payload_length
;
1465 padding
= ((-payload_length
) & 3);
1467 pr_debug("Receiving %u additional bytes"
1468 " for padding.\n", padding
);
1469 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1470 iov
[niov
++].iov_len
= padding
;
1473 if (conn
->conn_ops
->DataDigest
) {
1474 iov
[niov
].iov_base
= &checksum
;
1475 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1476 rx_size
+= ISCSI_CRC_LEN
;
1479 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1480 if (rx_got
!= rx_size
) {
1485 if (conn
->conn_ops
->DataDigest
) {
1486 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1487 ping_data
, payload_length
,
1488 padding
, cmd
->pad_bytes
,
1491 if (checksum
!= data_crc
) {
1492 pr_err("Ping data CRC32C DataDigest"
1493 " 0x%08x does not match computed 0x%08x\n",
1494 checksum
, data_crc
);
1495 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1496 pr_err("Unable to recover from"
1497 " NOPOUT Ping DataCRC failure while in"
1503 * Silently drop this PDU and let the
1504 * initiator plug the CmdSN gap.
1506 pr_debug("Dropping NOPOUT"
1507 " Command CmdSN: 0x%08x due to"
1508 " DataCRC error.\n", hdr
->cmdsn
);
1513 pr_debug("Got CRC32C DataDigest"
1514 " 0x%08x for %u bytes of ping data.\n",
1515 checksum
, payload_length
);
1519 ping_data
[payload_length
] = '\0';
1521 * Attach ping data to struct iscsi_cmd->buf_ptr.
1523 cmd
->buf_ptr
= ping_data
;
1524 cmd
->buf_ptr_size
= payload_length
;
1526 pr_debug("Got %u bytes of NOPOUT ping"
1527 " data.\n", payload_length
);
1528 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1531 if (hdr
->itt
!= RESERVED_ITT
) {
1533 pr_err("Checking CmdSN for NOPOUT,"
1534 " but cmd is NULL!\n");
1538 * Initiator is expecting a NopIN ping reply,
1540 spin_lock_bh(&conn
->cmd_lock
);
1541 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1542 spin_unlock_bh(&conn
->cmd_lock
);
1544 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1546 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1547 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1552 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1553 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1557 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1558 return iscsit_add_reject_from_cmd(
1559 ISCSI_REASON_PROTOCOL_ERROR
,
1565 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1567 * This was a response to a unsolicited NOPIN ping.
1569 cmd
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1573 iscsit_stop_nopin_response_timer(conn
);
1575 cmd
->i_state
= ISTATE_REMOVE
;
1576 iscsit_add_cmd_to_immediate_queue(cmd
, conn
, cmd
->i_state
);
1577 iscsit_start_nopin_timer(conn
);
1580 * Initiator is not expecting a NOPIN is response.
1581 * Just ignore for now.
1583 * iSCSI v19-91 10.18
1584 * "A NOP-OUT may also be used to confirm a changed
1585 * ExpStatSN if another PDU will not be available
1595 iscsit_release_cmd(cmd
);
1601 static int iscsit_handle_task_mgt_cmd(
1602 struct iscsi_conn
*conn
,
1605 struct iscsi_cmd
*cmd
;
1606 struct se_tmr_req
*se_tmr
;
1607 struct iscsi_tmr_req
*tmr_req
;
1608 struct iscsi_tm
*hdr
;
1609 int out_of_order_cmdsn
= 0;
1613 hdr
= (struct iscsi_tm
*) buf
;
1614 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1615 function
= hdr
->flags
;
1617 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1618 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1619 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1620 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1622 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1623 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1624 hdr
->rtt
!= RESERVED_ITT
)) {
1625 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1626 hdr
->rtt
= RESERVED_ITT
;
1629 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1630 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1631 pr_err("Task Management Request TASK_REASSIGN not"
1632 " issued as immediate command, bad iSCSI Initiator"
1633 "implementation\n");
1634 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1637 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1638 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1639 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1641 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
1643 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1646 cmd
->data_direction
= DMA_NONE
;
1648 cmd
->tmr_req
= kzalloc(sizeof(struct iscsi_tmr_req
), GFP_KERNEL
);
1649 if (!cmd
->tmr_req
) {
1650 pr_err("Unable to allocate memory for"
1651 " Task Management command!\n");
1652 return iscsit_add_reject_from_cmd(
1653 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1658 * TASK_REASSIGN for ERL=2 / connection stays inside of
1659 * LIO-Target $FABRIC_MOD
1661 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1666 transport_init_se_cmd(&cmd
->se_cmd
,
1667 &lio_target_fabric_configfs
->tf_ops
,
1668 conn
->sess
->se_sess
, 0, DMA_NONE
,
1669 MSG_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
1672 case ISCSI_TM_FUNC_ABORT_TASK
:
1673 tcm_function
= TMR_ABORT_TASK
;
1675 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1676 tcm_function
= TMR_ABORT_TASK_SET
;
1678 case ISCSI_TM_FUNC_CLEAR_ACA
:
1679 tcm_function
= TMR_CLEAR_ACA
;
1681 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1682 tcm_function
= TMR_CLEAR_TASK_SET
;
1684 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1685 tcm_function
= TMR_LUN_RESET
;
1687 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1688 tcm_function
= TMR_TARGET_WARM_RESET
;
1690 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1691 tcm_function
= TMR_TARGET_COLD_RESET
;
1694 pr_err("Unknown iSCSI TMR Function:"
1695 " 0x%02x\n", function
);
1696 return iscsit_add_reject_from_cmd(
1697 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1701 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
,
1702 tcm_function
, GFP_KERNEL
);
1704 return iscsit_add_reject_from_cmd(
1705 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1708 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
1711 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
1712 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
1713 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1714 cmd
->init_task_tag
= hdr
->itt
;
1715 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1716 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1717 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1718 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
1719 tmr_req
= cmd
->tmr_req
;
1721 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1723 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1724 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
1725 scsilun_to_int(&hdr
->lun
));
1727 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
1733 case ISCSI_TM_FUNC_ABORT_TASK
:
1734 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
1735 if (se_tmr
->response
)
1738 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1739 case ISCSI_TM_FUNC_CLEAR_ACA
:
1740 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1741 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1743 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1744 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
1745 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1749 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1750 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
1751 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1755 case ISCSI_TM_FUNC_TASK_REASSIGN
:
1756 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
1758 * Perform sanity checks on the ExpDataSN only if the
1759 * TASK_REASSIGN was successful.
1761 if (se_tmr
->response
)
1764 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
1765 return iscsit_add_reject_from_cmd(
1766 ISCSI_REASON_BOOKMARK_INVALID
, 1, 1,
1770 pr_err("Unknown TMR function: 0x%02x, protocol"
1771 " error.\n", function
);
1772 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
1776 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1777 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
1778 se_tmr
->call_transport
= 1;
1780 spin_lock_bh(&conn
->cmd_lock
);
1781 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1782 spin_unlock_bh(&conn
->cmd_lock
);
1784 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1785 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1786 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
1787 out_of_order_cmdsn
= 1;
1788 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1790 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1791 return iscsit_add_reject_from_cmd(
1792 ISCSI_REASON_PROTOCOL_ERROR
,
1795 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1797 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
1800 * Found the referenced task, send to transport for processing.
1802 if (se_tmr
->call_transport
)
1803 return transport_generic_handle_tmr(&cmd
->se_cmd
);
1806 * Could not find the referenced LUN, task, or Task Management
1807 * command not authorized or supported. Change state and
1808 * let the tx_thread send the response.
1810 * For connection recovery, this is also the default action for
1811 * TMR TASK_REASSIGN.
1813 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
1817 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1818 static int iscsit_handle_text_cmd(
1819 struct iscsi_conn
*conn
,
1822 char *text_ptr
, *text_in
;
1823 int cmdsn_ret
, niov
= 0, rx_got
, rx_size
;
1824 u32 checksum
= 0, data_crc
= 0, payload_length
;
1825 u32 padding
= 0, pad_bytes
= 0, text_length
= 0;
1826 struct iscsi_cmd
*cmd
;
1828 struct iscsi_text
*hdr
;
1830 hdr
= (struct iscsi_text
*) buf
;
1831 payload_length
= ntoh24(hdr
->dlength
);
1833 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1834 pr_err("Unable to accept text parameter length: %u"
1835 "greater than MaxXmitDataSegmentLength %u.\n",
1836 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1837 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1841 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1842 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
1843 hdr
->exp_statsn
, payload_length
);
1845 rx_size
= text_length
= payload_length
;
1847 text_in
= kzalloc(text_length
, GFP_KERNEL
);
1849 pr_err("Unable to allocate memory for"
1850 " incoming text parameters\n");
1854 memset(iov
, 0, 3 * sizeof(struct kvec
));
1855 iov
[niov
].iov_base
= text_in
;
1856 iov
[niov
++].iov_len
= text_length
;
1858 padding
= ((-payload_length
) & 3);
1860 iov
[niov
].iov_base
= &pad_bytes
;
1861 iov
[niov
++].iov_len
= padding
;
1863 pr_debug("Receiving %u additional bytes"
1864 " for padding.\n", padding
);
1866 if (conn
->conn_ops
->DataDigest
) {
1867 iov
[niov
].iov_base
= &checksum
;
1868 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1869 rx_size
+= ISCSI_CRC_LEN
;
1872 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
1873 if (rx_got
!= rx_size
) {
1878 if (conn
->conn_ops
->DataDigest
) {
1879 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1880 text_in
, text_length
,
1881 padding
, (u8
*)&pad_bytes
,
1884 if (checksum
!= data_crc
) {
1885 pr_err("Text data CRC32C DataDigest"
1886 " 0x%08x does not match computed"
1887 " 0x%08x\n", checksum
, data_crc
);
1888 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1889 pr_err("Unable to recover from"
1890 " Text Data digest failure while in"
1896 * Silently drop this PDU and let the
1897 * initiator plug the CmdSN gap.
1899 pr_debug("Dropping Text"
1900 " Command CmdSN: 0x%08x due to"
1901 " DataCRC error.\n", hdr
->cmdsn
);
1906 pr_debug("Got CRC32C DataDigest"
1907 " 0x%08x for %u bytes of text data.\n",
1908 checksum
, text_length
);
1911 text_in
[text_length
- 1] = '\0';
1912 pr_debug("Successfully read %d bytes of text"
1913 " data.\n", text_length
);
1915 if (strncmp("SendTargets", text_in
, 11) != 0) {
1916 pr_err("Received Text Data that is not"
1917 " SendTargets, cannot continue.\n");
1921 text_ptr
= strchr(text_in
, '=');
1923 pr_err("No \"=\" separator found in Text Data,"
1924 " cannot continue.\n");
1928 if (strncmp("=All", text_ptr
, 4) != 0) {
1929 pr_err("Unable to locate All value for"
1930 " SendTargets key, cannot continue.\n");
1934 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1938 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
1940 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1943 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
1944 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
1945 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1946 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1947 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1948 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1949 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1950 cmd
->data_direction
= DMA_NONE
;
1952 spin_lock_bh(&conn
->cmd_lock
);
1953 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1954 spin_unlock_bh(&conn
->cmd_lock
);
1956 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1958 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1959 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1960 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1961 return iscsit_add_reject_from_cmd(
1962 ISCSI_REASON_PROTOCOL_ERROR
,
1968 return iscsit_execute_cmd(cmd
, 0);
1971 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
1973 struct iscsi_conn
*conn_p
;
1974 struct iscsi_session
*sess
= conn
->sess
;
1976 pr_debug("Received logout request CLOSESESSION on CID: %hu"
1977 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
1979 atomic_set(&sess
->session_logout
, 1);
1980 atomic_set(&conn
->conn_logout_remove
, 1);
1981 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
1983 iscsit_inc_conn_usage_count(conn
);
1984 iscsit_inc_session_usage_count(sess
);
1986 spin_lock_bh(&sess
->conn_lock
);
1987 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
1988 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
1991 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
1992 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
1994 spin_unlock_bh(&sess
->conn_lock
);
1996 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2001 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2003 struct iscsi_conn
*l_conn
;
2004 struct iscsi_session
*sess
= conn
->sess
;
2006 pr_debug("Received logout request CLOSECONNECTION for CID:"
2007 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2010 * A Logout Request with a CLOSECONNECTION reason code for a CID
2011 * can arrive on a connection with a differing CID.
2013 if (conn
->cid
== cmd
->logout_cid
) {
2014 spin_lock_bh(&conn
->state_lock
);
2015 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2016 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2018 atomic_set(&conn
->conn_logout_remove
, 1);
2019 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2020 iscsit_inc_conn_usage_count(conn
);
2022 spin_unlock_bh(&conn
->state_lock
);
2025 * Handle all different cid CLOSECONNECTION requests in
2026 * iscsit_logout_post_handler_diffcid() as to give enough
2027 * time for any non immediate command's CmdSN to be
2028 * acknowledged on the connection in question.
2030 * Here we simply make sure the CID is still around.
2032 l_conn
= iscsit_get_conn_from_cid(sess
,
2035 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2036 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2041 iscsit_dec_conn_usage_count(l_conn
);
2044 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2049 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2051 struct iscsi_session
*sess
= conn
->sess
;
2053 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2054 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2056 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2057 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2058 " while ERL!=2.\n");
2059 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2060 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2064 if (conn
->cid
== cmd
->logout_cid
) {
2065 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2066 " with CID: %hu on CID: %hu, implementation error.\n",
2067 cmd
->logout_cid
, conn
->cid
);
2068 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2069 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2073 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2078 static int iscsit_handle_logout_cmd(
2079 struct iscsi_conn
*conn
,
2082 int cmdsn_ret
, logout_remove
= 0;
2084 struct iscsi_cmd
*cmd
;
2085 struct iscsi_logout
*hdr
;
2086 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2088 hdr
= (struct iscsi_logout
*) buf
;
2089 reason_code
= (hdr
->flags
& 0x7f);
2092 spin_lock(&tiqn
->logout_stats
.lock
);
2093 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2094 tiqn
->logout_stats
.normal_logouts
++;
2096 tiqn
->logout_stats
.abnormal_logouts
++;
2097 spin_unlock(&tiqn
->logout_stats
.lock
);
2100 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2101 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2102 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2103 hdr
->cid
, conn
->cid
);
2105 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2106 pr_err("Received logout request on connection that"
2107 " is not in logged in state, ignoring request.\n");
2111 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
2113 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
, 1,
2116 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2117 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2118 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2119 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2120 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2121 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2122 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2123 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2124 cmd
->logout_reason
= reason_code
;
2125 cmd
->data_direction
= DMA_NONE
;
2128 * We need to sleep in these cases (by returning 1) until the Logout
2129 * Response gets sent in the tx thread.
2131 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2132 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2133 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2136 spin_lock_bh(&conn
->cmd_lock
);
2137 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2138 spin_unlock_bh(&conn
->cmd_lock
);
2140 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2141 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2144 * Immediate commands are executed, well, immediately.
2145 * Non-Immediate Logout Commands are executed in CmdSN order.
2147 if (cmd
->immediate_cmd
) {
2148 int ret
= iscsit_execute_cmd(cmd
, 0);
2153 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
2154 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
2156 } else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
) {
2157 return iscsit_add_reject_from_cmd(
2158 ISCSI_REASON_PROTOCOL_ERROR
,
2163 return logout_remove
;
2166 static int iscsit_handle_snack(
2167 struct iscsi_conn
*conn
,
2170 struct iscsi_snack
*hdr
;
2172 hdr
= (struct iscsi_snack
*) buf
;
2173 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2175 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2176 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2177 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2178 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2180 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2181 pr_err("Initiator sent SNACK request while in"
2182 " ErrorRecoveryLevel=0.\n");
2183 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2187 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2188 * call from inside iscsi_send_recovery_datain_or_r2t().
2190 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2192 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2194 be32_to_cpu(hdr
->ttt
),
2195 be32_to_cpu(hdr
->begrun
),
2196 be32_to_cpu(hdr
->runlength
));
2197 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2198 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2199 be32_to_cpu(hdr
->ttt
),
2200 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2201 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2202 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2203 be32_to_cpu(hdr
->begrun
),
2204 be32_to_cpu(hdr
->runlength
));
2205 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2206 /* FIXME: Support R-Data SNACK */
2207 pr_err("R-Data SNACK Not Supported.\n");
2208 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2211 pr_err("Unknown SNACK type 0x%02x, protocol"
2212 " error.\n", hdr
->flags
& 0x0f);
2213 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2220 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2222 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2223 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2224 wait_for_completion_interruptible_timeout(
2225 &conn
->rx_half_close_comp
,
2226 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2230 static int iscsit_handle_immediate_data(
2231 struct iscsi_cmd
*cmd
,
2235 int iov_ret
, rx_got
= 0, rx_size
= 0;
2236 u32 checksum
, iov_count
= 0, padding
= 0;
2237 struct iscsi_conn
*conn
= cmd
->conn
;
2240 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2242 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2245 iov_count
= iov_ret
;
2246 iov
= &cmd
->iov_data
[0];
2248 padding
= ((-length
) & 3);
2250 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2251 iov
[iov_count
++].iov_len
= padding
;
2255 if (conn
->conn_ops
->DataDigest
) {
2256 iov
[iov_count
].iov_base
= &checksum
;
2257 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2258 rx_size
+= ISCSI_CRC_LEN
;
2261 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2263 iscsit_unmap_iovec(cmd
);
2265 if (rx_got
!= rx_size
) {
2266 iscsit_rx_thread_wait_for_tcp(conn
);
2267 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2270 if (conn
->conn_ops
->DataDigest
) {
2273 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
2274 cmd
->write_data_done
, length
, padding
,
2277 if (checksum
!= data_crc
) {
2278 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2279 " does not match computed 0x%08x\n", checksum
,
2282 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2283 pr_err("Unable to recover from"
2284 " Immediate Data digest failure while"
2286 iscsit_add_reject_from_cmd(
2287 ISCSI_REASON_DATA_DIGEST_ERROR
,
2289 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2291 iscsit_add_reject_from_cmd(
2292 ISCSI_REASON_DATA_DIGEST_ERROR
,
2294 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2297 pr_debug("Got CRC32C DataDigest 0x%08x for"
2298 " %u bytes of Immediate Data\n", checksum
,
2303 cmd
->write_data_done
+= length
;
2305 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2306 spin_lock_bh(&cmd
->istate_lock
);
2307 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2308 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2309 spin_unlock_bh(&cmd
->istate_lock
);
2312 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2316 * Called with sess->conn_lock held.
2318 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2319 with active network interface */
2320 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2322 struct iscsi_cmd
*cmd
;
2323 struct iscsi_conn
*conn_p
;
2326 * Only send a Asynchronous Message on connections whos network
2327 * interface is still functional.
2329 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2330 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2331 iscsit_inc_conn_usage_count(conn_p
);
2339 cmd
= iscsit_allocate_cmd(conn_p
, GFP_ATOMIC
);
2341 iscsit_dec_conn_usage_count(conn_p
);
2345 cmd
->logout_cid
= conn
->cid
;
2346 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2347 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2349 spin_lock_bh(&conn_p
->cmd_lock
);
2350 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2351 spin_unlock_bh(&conn_p
->cmd_lock
);
2353 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2354 iscsit_dec_conn_usage_count(conn_p
);
2357 static int iscsit_send_conn_drop_async_message(
2358 struct iscsi_cmd
*cmd
,
2359 struct iscsi_conn
*conn
)
2361 struct iscsi_async
*hdr
;
2363 cmd
->tx_size
= ISCSI_HDR_LEN
;
2364 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2366 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2367 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2368 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2369 cmd
->init_task_tag
= RESERVED_ITT
;
2370 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2371 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2372 cmd
->stat_sn
= conn
->stat_sn
++;
2373 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2374 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2375 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2376 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2377 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2378 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2379 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2381 if (conn
->conn_ops
->HeaderDigest
) {
2382 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2384 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2385 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2386 0, NULL
, (u8
*)header_digest
);
2388 cmd
->tx_size
+= ISCSI_CRC_LEN
;
2389 pr_debug("Attaching CRC32C HeaderDigest to"
2390 " Async Message 0x%08x\n", *header_digest
);
2393 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2394 cmd
->iov_misc
[0].iov_len
= cmd
->tx_size
;
2395 cmd
->iov_misc_count
= 1;
2397 pr_debug("Sending Connection Dropped Async Message StatSN:"
2398 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2399 cmd
->logout_cid
, conn
->cid
);
2403 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2405 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2406 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2407 wait_for_completion_interruptible_timeout(
2408 &conn
->tx_half_close_comp
,
2409 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2413 static int iscsit_send_data_in(
2414 struct iscsi_cmd
*cmd
,
2415 struct iscsi_conn
*conn
)
2417 int iov_ret
= 0, set_statsn
= 0;
2418 u32 iov_count
= 0, tx_size
= 0;
2419 struct iscsi_datain datain
;
2420 struct iscsi_datain_req
*dr
;
2421 struct iscsi_data_rsp
*hdr
;
2426 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2427 dr
= iscsit_get_datain_values(cmd
, &datain
);
2429 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2430 cmd
->init_task_tag
);
2435 * Be paranoid and double check the logic for now.
2437 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2438 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2439 " datain.length: %u exceeds cmd->data_length: %u\n",
2440 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2441 cmd
->se_cmd
.data_length
);
2445 spin_lock_bh(&conn
->sess
->session_stats_lock
);
2446 conn
->sess
->tx_data_octets
+= datain
.length
;
2447 if (conn
->sess
->se_sess
->se_node_acl
) {
2448 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
2449 conn
->sess
->se_sess
->se_node_acl
->read_bytes
+= datain
.length
;
2450 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
2452 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
2454 * Special case for successfully execution w/ both DATAIN
2457 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2458 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2459 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2461 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2462 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2463 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2464 cmd
->stat_sn
= conn
->stat_sn
++;
2466 } else if (dr
->dr_complete
==
2467 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2471 hdr
= (struct iscsi_data_rsp
*) cmd
->pdu
;
2472 memset(hdr
, 0, ISCSI_HDR_LEN
);
2473 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2474 hdr
->flags
= datain
.flags
;
2475 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2476 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2477 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2478 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2479 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2480 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2481 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2484 hton24(hdr
->dlength
, datain
.length
);
2485 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2486 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2487 (struct scsi_lun
*)&hdr
->lun
);
2489 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2491 hdr
->itt
= cmd
->init_task_tag
;
2493 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2494 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2496 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2498 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2500 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2502 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2503 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2504 hdr
->datasn
= cpu_to_be32(datain
.data_sn
);
2505 hdr
->offset
= cpu_to_be32(datain
.offset
);
2507 iov
= &cmd
->iov_data
[0];
2508 iov
[iov_count
].iov_base
= cmd
->pdu
;
2509 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
2510 tx_size
+= ISCSI_HDR_LEN
;
2512 if (conn
->conn_ops
->HeaderDigest
) {
2513 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2515 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2516 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2517 0, NULL
, (u8
*)header_digest
);
2519 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2520 tx_size
+= ISCSI_CRC_LEN
;
2522 pr_debug("Attaching CRC32 HeaderDigest"
2523 " for DataIN PDU 0x%08x\n", *header_digest
);
2526 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1], datain
.offset
, datain
.length
);
2530 iov_count
+= iov_ret
;
2531 tx_size
+= datain
.length
;
2533 cmd
->padding
= ((-datain
.length
) & 3);
2535 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2536 iov
[iov_count
++].iov_len
= cmd
->padding
;
2537 tx_size
+= cmd
->padding
;
2539 pr_debug("Attaching %u padding bytes\n",
2542 if (conn
->conn_ops
->DataDigest
) {
2543 cmd
->data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_tx_hash
, cmd
,
2544 datain
.offset
, datain
.length
, cmd
->padding
, cmd
->pad_bytes
);
2546 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
2547 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2548 tx_size
+= ISCSI_CRC_LEN
;
2550 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2551 " 0x%08x\n", datain
.length
+cmd
->padding
, cmd
->data_crc
);
2554 cmd
->iov_data_count
= iov_count
;
2555 cmd
->tx_size
= tx_size
;
2557 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2558 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2559 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2560 ntohl(hdr
->offset
), datain
.length
, conn
->cid
);
2562 /* sendpage is preferred but can't insert markers */
2563 if (!conn
->conn_ops
->IFMarker
)
2564 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
2566 ret
= iscsit_send_tx_data(cmd
, conn
, 0);
2568 iscsit_unmap_iovec(cmd
);
2571 iscsit_tx_thread_wait_for_tcp(conn
);
2575 if (dr
->dr_complete
) {
2576 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2578 iscsit_free_datain_req(cmd
, dr
);
2584 static int iscsit_send_logout_response(
2585 struct iscsi_cmd
*cmd
,
2586 struct iscsi_conn
*conn
)
2588 int niov
= 0, tx_size
;
2589 struct iscsi_conn
*logout_conn
= NULL
;
2590 struct iscsi_conn_recovery
*cr
= NULL
;
2591 struct iscsi_session
*sess
= conn
->sess
;
2593 struct iscsi_logout_rsp
*hdr
;
2595 * The actual shutting down of Sessions and/or Connections
2596 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2597 * is done in scsi_logout_post_handler().
2599 switch (cmd
->logout_reason
) {
2600 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2601 pr_debug("iSCSI session logout successful, setting"
2602 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2603 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2605 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2606 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2609 * For CLOSECONNECTION logout requests carrying
2610 * a matching logout CID -> local CID, the reference
2611 * for the local CID will have been incremented in
2612 * iscsi_logout_closeconnection().
2614 * For CLOSECONNECTION logout requests carrying
2615 * a different CID than the connection it arrived
2616 * on, the connection responding to cmd->logout_cid
2617 * is stopped in iscsit_logout_post_handler_diffcid().
2620 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2621 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2622 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2624 case ISCSI_LOGOUT_REASON_RECOVERY
:
2625 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2626 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2629 * If the connection is still active from our point of view
2630 * force connection recovery to occur.
2632 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2635 iscsit_connection_reinstatement_rcfr(logout_conn
);
2636 iscsit_dec_conn_usage_count(logout_conn
);
2639 cr
= iscsit_get_inactive_connection_recovery_entry(
2640 conn
->sess
, cmd
->logout_cid
);
2642 pr_err("Unable to locate CID: %hu for"
2643 " REMOVECONNFORRECOVERY Logout Request.\n",
2645 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2649 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2651 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2652 " for recovery for CID: %hu on CID: %hu successful.\n",
2653 cmd
->logout_cid
, conn
->cid
);
2654 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2657 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2658 cmd
->logout_reason
);
2662 tx_size
= ISCSI_HDR_LEN
;
2663 hdr
= (struct iscsi_logout_rsp
*)cmd
->pdu
;
2664 memset(hdr
, 0, ISCSI_HDR_LEN
);
2665 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2666 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2667 hdr
->response
= cmd
->logout_response
;
2668 hdr
->itt
= cmd
->init_task_tag
;
2669 cmd
->stat_sn
= conn
->stat_sn
++;
2670 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2672 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2673 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2674 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2676 iov
= &cmd
->iov_misc
[0];
2677 iov
[niov
].iov_base
= cmd
->pdu
;
2678 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2680 if (conn
->conn_ops
->HeaderDigest
) {
2681 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2683 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2684 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2685 0, NULL
, (u8
*)header_digest
);
2687 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2688 tx_size
+= ISCSI_CRC_LEN
;
2689 pr_debug("Attaching CRC32C HeaderDigest to"
2690 " Logout Response 0x%08x\n", *header_digest
);
2692 cmd
->iov_misc_count
= niov
;
2693 cmd
->tx_size
= tx_size
;
2695 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2696 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2697 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2698 cmd
->logout_cid
, conn
->cid
);
2704 * Unsolicited NOPIN, either requesting a response or not.
2706 static int iscsit_send_unsolicited_nopin(
2707 struct iscsi_cmd
*cmd
,
2708 struct iscsi_conn
*conn
,
2711 int tx_size
= ISCSI_HDR_LEN
;
2712 struct iscsi_nopin
*hdr
;
2715 hdr
= (struct iscsi_nopin
*) cmd
->pdu
;
2716 memset(hdr
, 0, ISCSI_HDR_LEN
);
2717 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2718 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2719 hdr
->itt
= cmd
->init_task_tag
;
2720 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2721 cmd
->stat_sn
= conn
->stat_sn
;
2722 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2723 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2724 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2726 if (conn
->conn_ops
->HeaderDigest
) {
2727 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2729 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2730 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2731 0, NULL
, (u8
*)header_digest
);
2733 tx_size
+= ISCSI_CRC_LEN
;
2734 pr_debug("Attaching CRC32C HeaderDigest to"
2735 " NopIN 0x%08x\n", *header_digest
);
2738 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2739 cmd
->iov_misc
[0].iov_len
= tx_size
;
2740 cmd
->iov_misc_count
= 1;
2741 cmd
->tx_size
= tx_size
;
2743 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2744 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
2746 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
2748 iscsit_tx_thread_wait_for_tcp(conn
);
2752 spin_lock_bh(&cmd
->istate_lock
);
2753 cmd
->i_state
= want_response
?
2754 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
2755 spin_unlock_bh(&cmd
->istate_lock
);
2760 static int iscsit_send_nopin_response(
2761 struct iscsi_cmd
*cmd
,
2762 struct iscsi_conn
*conn
)
2764 int niov
= 0, tx_size
;
2767 struct iscsi_nopin
*hdr
;
2769 tx_size
= ISCSI_HDR_LEN
;
2770 hdr
= (struct iscsi_nopin
*) cmd
->pdu
;
2771 memset(hdr
, 0, ISCSI_HDR_LEN
);
2772 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2773 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2774 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2775 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2776 hdr
->itt
= cmd
->init_task_tag
;
2777 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2778 cmd
->stat_sn
= conn
->stat_sn
++;
2779 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2781 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2782 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2783 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2785 iov
= &cmd
->iov_misc
[0];
2786 iov
[niov
].iov_base
= cmd
->pdu
;
2787 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2789 if (conn
->conn_ops
->HeaderDigest
) {
2790 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2792 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2793 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2794 0, NULL
, (u8
*)header_digest
);
2796 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2797 tx_size
+= ISCSI_CRC_LEN
;
2798 pr_debug("Attaching CRC32C HeaderDigest"
2799 " to NopIn 0x%08x\n", *header_digest
);
2803 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2804 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2806 if (cmd
->buf_ptr_size
) {
2807 iov
[niov
].iov_base
= cmd
->buf_ptr
;
2808 iov
[niov
++].iov_len
= cmd
->buf_ptr_size
;
2809 tx_size
+= cmd
->buf_ptr_size
;
2811 pr_debug("Echoing back %u bytes of ping"
2812 " data.\n", cmd
->buf_ptr_size
);
2814 padding
= ((-cmd
->buf_ptr_size
) & 3);
2816 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
2817 iov
[niov
++].iov_len
= padding
;
2819 pr_debug("Attaching %u additional"
2820 " padding bytes.\n", padding
);
2822 if (conn
->conn_ops
->DataDigest
) {
2823 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2824 cmd
->buf_ptr
, cmd
->buf_ptr_size
,
2825 padding
, (u8
*)&cmd
->pad_bytes
,
2826 (u8
*)&cmd
->data_crc
);
2828 iov
[niov
].iov_base
= &cmd
->data_crc
;
2829 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2830 tx_size
+= ISCSI_CRC_LEN
;
2831 pr_debug("Attached DataDigest for %u"
2832 " bytes of ping data, CRC 0x%08x\n",
2833 cmd
->buf_ptr_size
, cmd
->data_crc
);
2837 cmd
->iov_misc_count
= niov
;
2838 cmd
->tx_size
= tx_size
;
2840 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2841 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd
->init_task_tag
,
2842 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2847 static int iscsit_send_r2t(
2848 struct iscsi_cmd
*cmd
,
2849 struct iscsi_conn
*conn
)
2852 struct iscsi_r2t
*r2t
;
2853 struct iscsi_r2t_rsp
*hdr
;
2856 r2t
= iscsit_get_r2t_from_list(cmd
);
2860 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
2861 memset(hdr
, 0, ISCSI_HDR_LEN
);
2862 hdr
->opcode
= ISCSI_OP_R2T
;
2863 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2864 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2865 (struct scsi_lun
*)&hdr
->lun
);
2866 hdr
->itt
= cmd
->init_task_tag
;
2867 spin_lock_bh(&conn
->sess
->ttt_lock
);
2868 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
2869 if (r2t
->targ_xfer_tag
== 0xFFFFFFFF)
2870 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
2871 spin_unlock_bh(&conn
->sess
->ttt_lock
);
2872 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
2873 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
2874 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2875 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2876 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
2877 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
2878 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
2880 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2881 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
2882 tx_size
+= ISCSI_HDR_LEN
;
2884 if (conn
->conn_ops
->HeaderDigest
) {
2885 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2887 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2888 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2889 0, NULL
, (u8
*)header_digest
);
2891 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
2892 tx_size
+= ISCSI_CRC_LEN
;
2893 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2894 " PDU 0x%08x\n", *header_digest
);
2897 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2898 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2899 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
2900 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
2901 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
2903 cmd
->iov_misc_count
= 1;
2904 cmd
->tx_size
= tx_size
;
2906 spin_lock_bh(&cmd
->r2t_lock
);
2908 spin_unlock_bh(&cmd
->r2t_lock
);
2910 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
2912 iscsit_tx_thread_wait_for_tcp(conn
);
2916 spin_lock_bh(&cmd
->dataout_timeout_lock
);
2917 iscsit_start_dataout_timer(cmd
, conn
);
2918 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
2924 * @recovery: If called from iscsi_task_reassign_complete_write() for
2925 * connection recovery.
2927 int iscsit_build_r2ts_for_cmd(
2928 struct iscsi_cmd
*cmd
,
2929 struct iscsi_conn
*conn
,
2933 u32 offset
= 0, xfer_len
= 0;
2935 spin_lock_bh(&cmd
->r2t_lock
);
2936 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
2937 spin_unlock_bh(&cmd
->r2t_lock
);
2941 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
2943 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
2945 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
2946 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
2947 offset
= cmd
->r2t_offset
;
2949 if (first_r2t
&& recovery
) {
2950 int new_data_end
= offset
+
2951 conn
->sess
->sess_ops
->MaxBurstLength
-
2952 cmd
->next_burst_len
;
2954 if (new_data_end
> cmd
->se_cmd
.data_length
)
2955 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
2958 conn
->sess
->sess_ops
->MaxBurstLength
-
2959 cmd
->next_burst_len
;
2961 int new_data_end
= offset
+
2962 conn
->sess
->sess_ops
->MaxBurstLength
;
2964 if (new_data_end
> cmd
->se_cmd
.data_length
)
2965 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
2967 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
2969 cmd
->r2t_offset
+= xfer_len
;
2971 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
2972 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
2974 struct iscsi_seq
*seq
;
2976 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
2978 spin_unlock_bh(&cmd
->r2t_lock
);
2982 offset
= seq
->offset
;
2983 xfer_len
= seq
->xfer_len
;
2985 if (cmd
->seq_send_order
== cmd
->seq_count
)
2986 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
2988 cmd
->outstanding_r2ts
++;
2991 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
2992 spin_unlock_bh(&cmd
->r2t_lock
);
2996 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
2999 spin_unlock_bh(&cmd
->r2t_lock
);
3004 static int iscsit_send_status(
3005 struct iscsi_cmd
*cmd
,
3006 struct iscsi_conn
*conn
)
3008 u8 iov_count
= 0, recovery
;
3009 u32 padding
= 0, tx_size
= 0;
3010 struct iscsi_scsi_rsp
*hdr
;
3013 recovery
= (cmd
->i_state
!= ISTATE_SEND_STATUS
);
3015 cmd
->stat_sn
= conn
->stat_sn
++;
3017 spin_lock_bh(&conn
->sess
->session_stats_lock
);
3018 conn
->sess
->rsp_pdus
++;
3019 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
3021 hdr
= (struct iscsi_scsi_rsp
*) cmd
->pdu
;
3022 memset(hdr
, 0, ISCSI_HDR_LEN
);
3023 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3024 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3025 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3026 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3027 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3028 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3029 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3030 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3032 hdr
->response
= cmd
->iscsi_response
;
3033 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3034 hdr
->itt
= cmd
->init_task_tag
;
3035 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3037 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3038 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3039 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3041 iov
= &cmd
->iov_misc
[0];
3042 iov
[iov_count
].iov_base
= cmd
->pdu
;
3043 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3044 tx_size
+= ISCSI_HDR_LEN
;
3047 * Attach SENSE DATA payload to iSCSI Response PDU
3049 if (cmd
->se_cmd
.sense_buffer
&&
3050 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3051 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3052 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3053 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3055 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3056 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3057 iov
[iov_count
].iov_base
= cmd
->sense_buffer
;
3058 iov
[iov_count
++].iov_len
=
3059 (cmd
->se_cmd
.scsi_sense_length
+ padding
);
3060 tx_size
+= cmd
->se_cmd
.scsi_sense_length
;
3063 memset(cmd
->sense_buffer
+
3064 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3066 pr_debug("Adding %u bytes of padding to"
3067 " SENSE.\n", padding
);
3070 if (conn
->conn_ops
->DataDigest
) {
3071 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3073 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3074 0, NULL
, (u8
*)&cmd
->data_crc
);
3076 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3077 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3078 tx_size
+= ISCSI_CRC_LEN
;
3080 pr_debug("Attaching CRC32 DataDigest for"
3081 " SENSE, %u bytes CRC 0x%08x\n",
3082 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3086 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3088 cmd
->se_cmd
.scsi_sense_length
);
3091 if (conn
->conn_ops
->HeaderDigest
) {
3092 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3094 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3095 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3096 0, NULL
, (u8
*)header_digest
);
3098 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3099 tx_size
+= ISCSI_CRC_LEN
;
3100 pr_debug("Attaching CRC32 HeaderDigest for Response"
3101 " PDU 0x%08x\n", *header_digest
);
3104 cmd
->iov_misc_count
= iov_count
;
3105 cmd
->tx_size
= tx_size
;
3107 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3108 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3109 (!recovery
) ? "" : "Recovery ", cmd
->init_task_tag
,
3110 cmd
->stat_sn
, 0x00, cmd
->se_cmd
.scsi_status
, conn
->cid
);
3115 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3117 switch (se_tmr
->response
) {
3118 case TMR_FUNCTION_COMPLETE
:
3119 return ISCSI_TMF_RSP_COMPLETE
;
3120 case TMR_TASK_DOES_NOT_EXIST
:
3121 return ISCSI_TMF_RSP_NO_TASK
;
3122 case TMR_LUN_DOES_NOT_EXIST
:
3123 return ISCSI_TMF_RSP_NO_LUN
;
3124 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3125 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3126 case TMR_FUNCTION_AUTHORIZATION_FAILED
:
3127 return ISCSI_TMF_RSP_AUTH_FAILED
;
3128 case TMR_FUNCTION_REJECTED
:
3130 return ISCSI_TMF_RSP_REJECTED
;
3134 static int iscsit_send_task_mgt_rsp(
3135 struct iscsi_cmd
*cmd
,
3136 struct iscsi_conn
*conn
)
3138 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3139 struct iscsi_tm_rsp
*hdr
;
3142 hdr
= (struct iscsi_tm_rsp
*) cmd
->pdu
;
3143 memset(hdr
, 0, ISCSI_HDR_LEN
);
3144 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3145 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3146 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3147 hdr
->itt
= cmd
->init_task_tag
;
3148 cmd
->stat_sn
= conn
->stat_sn
++;
3149 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3151 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3152 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3153 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3155 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3156 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3157 tx_size
+= ISCSI_HDR_LEN
;
3159 if (conn
->conn_ops
->HeaderDigest
) {
3160 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3162 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3163 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3164 0, NULL
, (u8
*)header_digest
);
3166 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3167 tx_size
+= ISCSI_CRC_LEN
;
3168 pr_debug("Attaching CRC32 HeaderDigest for Task"
3169 " Mgmt Response PDU 0x%08x\n", *header_digest
);
3172 cmd
->iov_misc_count
= 1;
3173 cmd
->tx_size
= tx_size
;
3175 pr_debug("Built Task Management Response ITT: 0x%08x,"
3176 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3177 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3182 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3186 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3187 const struct sockaddr_in6 sin6
= {
3188 .sin6_addr
= IN6ADDR_ANY_INIT
};
3189 struct sockaddr_in6
*sock_in6
=
3190 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3192 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3193 sin6
.sin6_addr
.s6_addr
, 16))
3196 struct sockaddr_in
* sock_in
=
3197 (struct sockaddr_in
*)&np
->np_sockaddr
;
3199 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3206 #define SENDTARGETS_BUF_LIMIT 32768U
3208 static int iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
)
3210 char *payload
= NULL
;
3211 struct iscsi_conn
*conn
= cmd
->conn
;
3212 struct iscsi_portal_group
*tpg
;
3213 struct iscsi_tiqn
*tiqn
;
3214 struct iscsi_tpg_np
*tpg_np
;
3215 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3216 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3218 buffer_len
= max(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3219 SENDTARGETS_BUF_LIMIT
);
3221 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3223 pr_err("Unable to allocate memory for sendtargets"
3228 spin_lock(&tiqn_lock
);
3229 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3230 len
= sprintf(buf
, "TargetName=%s", tiqn
->tiqn
);
3233 if ((len
+ payload_len
) > buffer_len
) {
3237 memcpy(payload
+ payload_len
, buf
, len
);
3240 spin_lock(&tiqn
->tiqn_tpg_lock
);
3241 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3243 spin_lock(&tpg
->tpg_state_lock
);
3244 if ((tpg
->tpg_state
== TPG_STATE_FREE
) ||
3245 (tpg
->tpg_state
== TPG_STATE_INACTIVE
)) {
3246 spin_unlock(&tpg
->tpg_state_lock
);
3249 spin_unlock(&tpg
->tpg_state_lock
);
3251 spin_lock(&tpg
->tpg_np_lock
);
3252 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3254 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3255 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3257 len
= sprintf(buf
, "TargetAddress="
3259 (np
->np_sockaddr
.ss_family
== AF_INET6
) ?
3260 "[" : "", (inaddr_any
== false) ?
3261 np
->np_ip
: conn
->local_ip
,
3262 (np
->np_sockaddr
.ss_family
== AF_INET6
) ?
3263 "]" : "", (inaddr_any
== false) ?
3264 np
->np_port
: conn
->local_port
,
3268 if ((len
+ payload_len
) > buffer_len
) {
3269 spin_unlock(&tpg
->tpg_np_lock
);
3270 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3274 memcpy(payload
+ payload_len
, buf
, len
);
3277 spin_unlock(&tpg
->tpg_np_lock
);
3279 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3284 spin_unlock(&tiqn_lock
);
3286 cmd
->buf_ptr
= payload
;
3292 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3293 * MaxRecvDataSegmentLength.
3295 static int iscsit_send_text_rsp(
3296 struct iscsi_cmd
*cmd
,
3297 struct iscsi_conn
*conn
)
3299 struct iscsi_text_rsp
*hdr
;
3301 u32 padding
= 0, tx_size
= 0;
3302 int text_length
, iov_count
= 0;
3304 text_length
= iscsit_build_sendtargets_response(cmd
);
3305 if (text_length
< 0)
3308 padding
= ((-text_length
) & 3);
3310 memset(cmd
->buf_ptr
+ text_length
, 0, padding
);
3311 pr_debug("Attaching %u additional bytes for"
3312 " padding.\n", padding
);
3315 hdr
= (struct iscsi_text_rsp
*) cmd
->pdu
;
3316 memset(hdr
, 0, ISCSI_HDR_LEN
);
3317 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3318 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3319 hton24(hdr
->dlength
, text_length
);
3320 hdr
->itt
= cmd
->init_task_tag
;
3321 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3322 cmd
->stat_sn
= conn
->stat_sn
++;
3323 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3325 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3326 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3327 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3329 iov
= &cmd
->iov_misc
[0];
3331 iov
[iov_count
].iov_base
= cmd
->pdu
;
3332 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3333 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3334 iov
[iov_count
++].iov_len
= text_length
+ padding
;
3336 tx_size
+= (ISCSI_HDR_LEN
+ text_length
+ padding
);
3338 if (conn
->conn_ops
->HeaderDigest
) {
3339 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3341 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3342 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3343 0, NULL
, (u8
*)header_digest
);
3345 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3346 tx_size
+= ISCSI_CRC_LEN
;
3347 pr_debug("Attaching CRC32 HeaderDigest for"
3348 " Text Response PDU 0x%08x\n", *header_digest
);
3351 if (conn
->conn_ops
->DataDigest
) {
3352 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3353 cmd
->buf_ptr
, (text_length
+ padding
),
3354 0, NULL
, (u8
*)&cmd
->data_crc
);
3356 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3357 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3358 tx_size
+= ISCSI_CRC_LEN
;
3360 pr_debug("Attaching DataDigest for %u bytes of text"
3361 " data, CRC 0x%08x\n", (text_length
+ padding
),
3365 cmd
->iov_misc_count
= iov_count
;
3366 cmd
->tx_size
= tx_size
;
3368 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3369 " Length: %u, CID: %hu\n", cmd
->init_task_tag
, cmd
->stat_sn
,
3370 text_length
, conn
->cid
);
3374 static int iscsit_send_reject(
3375 struct iscsi_cmd
*cmd
,
3376 struct iscsi_conn
*conn
)
3378 u32 iov_count
= 0, tx_size
= 0;
3379 struct iscsi_reject
*hdr
;
3382 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
3383 hdr
->opcode
= ISCSI_OP_REJECT
;
3384 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3385 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3386 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3387 cmd
->stat_sn
= conn
->stat_sn
++;
3388 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3389 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3390 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3392 iov
= &cmd
->iov_misc
[0];
3394 iov
[iov_count
].iov_base
= cmd
->pdu
;
3395 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3396 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3397 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3399 tx_size
= (ISCSI_HDR_LEN
+ ISCSI_HDR_LEN
);
3401 if (conn
->conn_ops
->HeaderDigest
) {
3402 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3404 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3405 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3406 0, NULL
, (u8
*)header_digest
);
3408 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3409 tx_size
+= ISCSI_CRC_LEN
;
3410 pr_debug("Attaching CRC32 HeaderDigest for"
3411 " REJECT PDU 0x%08x\n", *header_digest
);
3414 if (conn
->conn_ops
->DataDigest
) {
3415 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3416 (unsigned char *)cmd
->buf_ptr
, ISCSI_HDR_LEN
,
3417 0, NULL
, (u8
*)&cmd
->data_crc
);
3419 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3420 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3421 tx_size
+= ISCSI_CRC_LEN
;
3422 pr_debug("Attaching CRC32 DataDigest for REJECT"
3423 " PDU 0x%08x\n", cmd
->data_crc
);
3426 cmd
->iov_misc_count
= iov_count
;
3427 cmd
->tx_size
= tx_size
;
3429 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3430 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3435 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3437 struct iscsi_thread_set
*ts
= conn
->thread_set
;
3440 * thread_id is assigned from iscsit_global->ts_bitmap from
3441 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3443 * Here we use thread_id to determine which CPU that this
3444 * iSCSI connection's iscsi_thread_set will be scheduled to
3447 ord
= ts
->thread_id
% cpumask_weight(cpu_online_mask
);
3448 for_each_online_cpu(cpu
) {
3450 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3455 * This should never be reached..
3458 cpumask_setall(conn
->conn_cpumask
);
3461 static inline void iscsit_thread_check_cpumask(
3462 struct iscsi_conn
*conn
,
3463 struct task_struct
*p
,
3468 * mode == 1 signals iscsi_target_tx_thread() usage.
3469 * mode == 0 signals iscsi_target_rx_thread() usage.
3472 if (!conn
->conn_tx_reset_cpumask
)
3474 conn
->conn_tx_reset_cpumask
= 0;
3476 if (!conn
->conn_rx_reset_cpumask
)
3478 conn
->conn_rx_reset_cpumask
= 0;
3481 * Update the CPU mask for this single kthread so that
3482 * both TX and RX kthreads are scheduled to run on the
3485 memset(buf
, 0, 128);
3486 cpumask_scnprintf(buf
, 128, conn
->conn_cpumask
);
3487 set_cpus_allowed_ptr(p
, conn
->conn_cpumask
);
3490 static int handle_immediate_queue(struct iscsi_conn
*conn
)
3492 struct iscsi_queue_req
*qr
;
3493 struct iscsi_cmd
*cmd
;
3497 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3498 atomic_set(&conn
->check_immediate_queue
, 0);
3501 kmem_cache_free(lio_qr_cache
, qr
);
3504 case ISTATE_SEND_R2T
:
3505 ret
= iscsit_send_r2t(cmd
, conn
);
3510 if (cmd
->data_direction
== DMA_TO_DEVICE
)
3511 iscsit_stop_dataout_timer(cmd
);
3513 spin_lock_bh(&conn
->cmd_lock
);
3514 list_del(&cmd
->i_conn_node
);
3515 spin_unlock_bh(&conn
->cmd_lock
);
3517 iscsit_free_cmd(cmd
);
3519 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3520 iscsit_mod_nopin_response_timer(conn
);
3521 ret
= iscsit_send_unsolicited_nopin(cmd
,
3526 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3527 ret
= iscsit_send_unsolicited_nopin(cmd
,
3533 pr_err("Unknown Opcode: 0x%02x ITT:"
3534 " 0x%08x, i_state: %d on CID: %hu\n",
3535 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3547 static int handle_response_queue(struct iscsi_conn
*conn
)
3549 struct iscsi_queue_req
*qr
;
3550 struct iscsi_cmd
*cmd
;
3554 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3557 kmem_cache_free(lio_qr_cache
, qr
);
3561 case ISTATE_SEND_DATAIN
:
3562 ret
= iscsit_send_data_in(cmd
, conn
);
3567 goto check_rsp_state
;
3568 else if (ret
== 1) {
3570 spin_lock_bh(&cmd
->istate_lock
);
3571 cmd
->i_state
= ISTATE_SENT_STATUS
;
3572 spin_unlock_bh(&cmd
->istate_lock
);
3574 } else if (ret
== 2) {
3575 /* Still must send status,
3576 SCF_TRANSPORT_TASK_SENSE was set */
3577 spin_lock_bh(&cmd
->istate_lock
);
3578 cmd
->i_state
= ISTATE_SEND_STATUS
;
3579 spin_unlock_bh(&cmd
->istate_lock
);
3580 state
= ISTATE_SEND_STATUS
;
3581 goto check_rsp_state
;
3585 case ISTATE_SEND_STATUS
:
3586 case ISTATE_SEND_STATUS_RECOVERY
:
3587 ret
= iscsit_send_status(cmd
, conn
);
3589 case ISTATE_SEND_LOGOUTRSP
:
3590 ret
= iscsit_send_logout_response(cmd
, conn
);
3592 case ISTATE_SEND_ASYNCMSG
:
3593 ret
= iscsit_send_conn_drop_async_message(
3596 case ISTATE_SEND_NOPIN
:
3597 ret
= iscsit_send_nopin_response(cmd
, conn
);
3599 case ISTATE_SEND_REJECT
:
3600 ret
= iscsit_send_reject(cmd
, conn
);
3602 case ISTATE_SEND_TASKMGTRSP
:
3603 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3606 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3608 iscsit_fall_back_to_erl0(conn
->sess
);
3610 case ISTATE_SEND_TEXTRSP
:
3611 ret
= iscsit_send_text_rsp(cmd
, conn
);
3614 pr_err("Unknown Opcode: 0x%02x ITT:"
3615 " 0x%08x, i_state: %d on CID: %hu\n",
3616 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3623 if (iscsit_send_tx_data(cmd
, conn
, 1) < 0) {
3624 iscsit_tx_thread_wait_for_tcp(conn
);
3625 iscsit_unmap_iovec(cmd
);
3628 iscsit_unmap_iovec(cmd
);
3631 case ISTATE_SEND_LOGOUTRSP
:
3632 if (!iscsit_logout_post_handler(cmd
, conn
))
3635 case ISTATE_SEND_STATUS
:
3636 case ISTATE_SEND_ASYNCMSG
:
3637 case ISTATE_SEND_NOPIN
:
3638 case ISTATE_SEND_STATUS_RECOVERY
:
3639 case ISTATE_SEND_TEXTRSP
:
3640 case ISTATE_SEND_TASKMGTRSP
:
3641 spin_lock_bh(&cmd
->istate_lock
);
3642 cmd
->i_state
= ISTATE_SENT_STATUS
;
3643 spin_unlock_bh(&cmd
->istate_lock
);
3645 case ISTATE_SEND_REJECT
:
3646 if (cmd
->cmd_flags
& ICF_REJECT_FAIL_CONN
) {
3647 cmd
->cmd_flags
&= ~ICF_REJECT_FAIL_CONN
;
3648 complete(&cmd
->reject_comp
);
3651 complete(&cmd
->reject_comp
);
3654 pr_err("Unknown Opcode: 0x%02x ITT:"
3655 " 0x%08x, i_state: %d on CID: %hu\n",
3656 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3657 cmd
->i_state
, conn
->cid
);
3661 if (atomic_read(&conn
->check_immediate_queue
))
3673 int iscsi_target_tx_thread(void *arg
)
3676 struct iscsi_conn
*conn
;
3677 struct iscsi_thread_set
*ts
= arg
;
3679 * Allow ourselves to be interrupted by SIGINT so that a
3680 * connection recovery / failure event can be triggered externally.
3682 allow_signal(SIGINT
);
3685 conn
= iscsi_tx_thread_pre_handler(ts
);
3691 while (!kthread_should_stop()) {
3693 * Ensure that both TX and RX per connection kthreads
3694 * are scheduled to run on the same CPU.
3696 iscsit_thread_check_cpumask(conn
, current
, 1);
3698 wait_event_interruptible(conn
->queues_wq
,
3699 !iscsit_conn_all_queues_empty(conn
) ||
3700 ts
->status
== ISCSI_THREAD_SET_RESET
);
3702 if ((ts
->status
== ISCSI_THREAD_SET_RESET
) ||
3703 signal_pending(current
))
3706 ret
= handle_immediate_queue(conn
);
3710 ret
= handle_response_queue(conn
);
3718 iscsit_take_action_for_connection_exit(conn
);
3724 int iscsi_target_rx_thread(void *arg
)
3727 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3728 u32 checksum
= 0, digest
= 0;
3729 struct iscsi_conn
*conn
= NULL
;
3730 struct iscsi_thread_set
*ts
= arg
;
3733 * Allow ourselves to be interrupted by SIGINT so that a
3734 * connection recovery / failure event can be triggered externally.
3736 allow_signal(SIGINT
);
3739 conn
= iscsi_rx_thread_pre_handler(ts
);
3743 while (!kthread_should_stop()) {
3745 * Ensure that both TX and RX per connection kthreads
3746 * are scheduled to run on the same CPU.
3748 iscsit_thread_check_cpumask(conn
, current
, 0);
3750 memset(buffer
, 0, ISCSI_HDR_LEN
);
3751 memset(&iov
, 0, sizeof(struct kvec
));
3753 iov
.iov_base
= buffer
;
3754 iov
.iov_len
= ISCSI_HDR_LEN
;
3756 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3757 if (ret
!= ISCSI_HDR_LEN
) {
3758 iscsit_rx_thread_wait_for_tcp(conn
);
3763 * Set conn->bad_hdr for use with REJECT PDUs.
3765 memcpy(&conn
->bad_hdr
, &buffer
, ISCSI_HDR_LEN
);
3767 if (conn
->conn_ops
->HeaderDigest
) {
3768 iov
.iov_base
= &digest
;
3769 iov
.iov_len
= ISCSI_CRC_LEN
;
3771 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3772 if (ret
!= ISCSI_CRC_LEN
) {
3773 iscsit_rx_thread_wait_for_tcp(conn
);
3777 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
3778 buffer
, ISCSI_HDR_LEN
,
3779 0, NULL
, (u8
*)&checksum
);
3781 if (digest
!= checksum
) {
3782 pr_err("HeaderDigest CRC32C failed,"
3783 " received 0x%08x, computed 0x%08x\n",
3786 * Set the PDU to 0xff so it will intentionally
3787 * hit default in the switch below.
3789 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3790 spin_lock_bh(&conn
->sess
->session_stats_lock
);
3791 conn
->sess
->conn_digest_errors
++;
3792 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
3794 pr_debug("Got HeaderDigest CRC32C"
3795 " 0x%08x\n", checksum
);
3799 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
3802 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
3804 if (conn
->sess
->sess_ops
->SessionType
&&
3805 ((!(opcode
& ISCSI_OP_TEXT
)) ||
3806 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
3807 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3808 " while in Discovery Session, rejecting.\n", opcode
);
3809 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
3815 case ISCSI_OP_SCSI_CMD
:
3816 if (iscsit_handle_scsi_cmd(conn
, buffer
) < 0)
3819 case ISCSI_OP_SCSI_DATA_OUT
:
3820 if (iscsit_handle_data_out(conn
, buffer
) < 0)
3823 case ISCSI_OP_NOOP_OUT
:
3824 if (iscsit_handle_nop_out(conn
, buffer
) < 0)
3827 case ISCSI_OP_SCSI_TMFUNC
:
3828 if (iscsit_handle_task_mgt_cmd(conn
, buffer
) < 0)
3832 if (iscsit_handle_text_cmd(conn
, buffer
) < 0)
3835 case ISCSI_OP_LOGOUT
:
3836 ret
= iscsit_handle_logout_cmd(conn
, buffer
);
3838 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3839 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3844 case ISCSI_OP_SNACK
:
3845 if (iscsit_handle_snack(conn
, buffer
) < 0)
3849 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3851 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3852 pr_err("Cannot recover from unknown"
3853 " opcode while ERL=0, closing iSCSI connection"
3857 if (!conn
->conn_ops
->OFMarker
) {
3858 pr_err("Unable to recover from unknown"
3859 " opcode while OFMarker=No, closing iSCSI"
3863 if (iscsit_recover_from_unknown_opcode(conn
) < 0) {
3864 pr_err("Unable to recover from unknown"
3865 " opcode, closing iSCSI connection.\n");
3873 if (!signal_pending(current
))
3874 atomic_set(&conn
->transport_failed
, 1);
3875 iscsit_take_action_for_connection_exit(conn
);
3881 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
3883 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
3884 struct iscsi_session
*sess
= conn
->sess
;
3886 * We expect this function to only ever be called from either RX or TX
3887 * thread context via iscsit_close_connection() once the other context
3888 * has been reset -> returned sleeping pre-handler state.
3890 spin_lock_bh(&conn
->cmd_lock
);
3891 list_for_each_entry_safe(cmd
, cmd_tmp
, &conn
->conn_cmd_list
, i_conn_node
) {
3893 list_del(&cmd
->i_conn_node
);
3894 spin_unlock_bh(&conn
->cmd_lock
);
3896 iscsit_increment_maxcmdsn(cmd
, sess
);
3898 iscsit_free_cmd(cmd
);
3900 spin_lock_bh(&conn
->cmd_lock
);
3902 spin_unlock_bh(&conn
->cmd_lock
);
3905 static void iscsit_stop_timers_for_cmds(
3906 struct iscsi_conn
*conn
)
3908 struct iscsi_cmd
*cmd
;
3910 spin_lock_bh(&conn
->cmd_lock
);
3911 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
3912 if (cmd
->data_direction
== DMA_TO_DEVICE
)
3913 iscsit_stop_dataout_timer(cmd
);
3915 spin_unlock_bh(&conn
->cmd_lock
);
3918 int iscsit_close_connection(
3919 struct iscsi_conn
*conn
)
3921 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
3922 struct iscsi_session
*sess
= conn
->sess
;
3924 pr_debug("Closing iSCSI connection CID %hu on SID:"
3925 " %u\n", conn
->cid
, sess
->sid
);
3927 * Always up conn_logout_comp just in case the RX Thread is sleeping
3928 * and the logout response never got sent because the connection
3931 complete(&conn
->conn_logout_comp
);
3933 iscsi_release_thread_set(conn
);
3935 iscsit_stop_timers_for_cmds(conn
);
3936 iscsit_stop_nopin_response_timer(conn
);
3937 iscsit_stop_nopin_timer(conn
);
3938 iscsit_free_queue_reqs_for_conn(conn
);
3941 * During Connection recovery drop unacknowledged out of order
3942 * commands for this connection, and prepare the other commands
3945 * During normal operation clear the out of order commands (but
3946 * do not free the struct iscsi_ooo_cmdsn's) and release all
3947 * struct iscsi_cmds.
3949 if (atomic_read(&conn
->connection_recovery
)) {
3950 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
3951 iscsit_prepare_cmds_for_realligance(conn
);
3953 iscsit_clear_ooo_cmdsns_for_conn(conn
);
3954 iscsit_release_commands_from_conn(conn
);
3958 * Handle decrementing session or connection usage count if
3959 * a logout response was not able to be sent because the
3960 * connection failed. Fall back to Session Recovery here.
3962 if (atomic_read(&conn
->conn_logout_remove
)) {
3963 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
3964 iscsit_dec_conn_usage_count(conn
);
3965 iscsit_dec_session_usage_count(sess
);
3967 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
3968 iscsit_dec_conn_usage_count(conn
);
3970 atomic_set(&conn
->conn_logout_remove
, 0);
3971 atomic_set(&sess
->session_reinstatement
, 0);
3972 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
3975 spin_lock_bh(&sess
->conn_lock
);
3976 list_del(&conn
->conn_list
);
3979 * Attempt to let the Initiator know this connection failed by
3980 * sending an Connection Dropped Async Message on another
3981 * active connection.
3983 if (atomic_read(&conn
->connection_recovery
))
3984 iscsit_build_conn_drop_async_message(conn
);
3986 spin_unlock_bh(&sess
->conn_lock
);
3989 * If connection reinstatement is being performed on this connection,
3990 * up the connection reinstatement semaphore that is being blocked on
3991 * in iscsit_cause_connection_reinstatement().
3993 spin_lock_bh(&conn
->state_lock
);
3994 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
3995 spin_unlock_bh(&conn
->state_lock
);
3996 complete(&conn
->conn_wait_comp
);
3997 wait_for_completion(&conn
->conn_post_wait_comp
);
3998 spin_lock_bh(&conn
->state_lock
);
4002 * If connection reinstatement is being performed on this connection
4003 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4004 * connection wait rcfr semaphore that is being blocked on
4005 * an iscsit_connection_reinstatement_rcfr().
4007 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4008 spin_unlock_bh(&conn
->state_lock
);
4009 complete(&conn
->conn_wait_rcfr_comp
);
4010 wait_for_completion(&conn
->conn_post_wait_comp
);
4011 spin_lock_bh(&conn
->state_lock
);
4013 atomic_set(&conn
->connection_reinstatement
, 1);
4014 spin_unlock_bh(&conn
->state_lock
);
4017 * If any other processes are accessing this connection pointer we
4018 * must wait until they have completed.
4020 iscsit_check_conn_usage_count(conn
);
4022 if (conn
->conn_rx_hash
.tfm
)
4023 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
4024 if (conn
->conn_tx_hash
.tfm
)
4025 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
4027 if (conn
->conn_cpumask
)
4028 free_cpumask_var(conn
->conn_cpumask
);
4030 kfree(conn
->conn_ops
);
4031 conn
->conn_ops
= NULL
;
4034 sock_release(conn
->sock
);
4035 conn
->thread_set
= NULL
;
4037 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4038 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4041 spin_lock_bh(&sess
->conn_lock
);
4042 atomic_dec(&sess
->nconn
);
4043 pr_debug("Decremented iSCSI connection count to %hu from node:"
4044 " %s\n", atomic_read(&sess
->nconn
),
4045 sess
->sess_ops
->InitiatorName
);
4047 * Make sure that if one connection fails in an non ERL=2 iSCSI
4048 * Session that they all fail.
4050 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4051 !atomic_read(&sess
->session_logout
))
4052 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4055 * If this was not the last connection in the session, and we are
4056 * performing session reinstatement or falling back to ERL=0, call
4057 * iscsit_stop_session() without sleeping to shutdown the other
4058 * active connections.
4060 if (atomic_read(&sess
->nconn
)) {
4061 if (!atomic_read(&sess
->session_reinstatement
) &&
4062 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4063 spin_unlock_bh(&sess
->conn_lock
);
4066 if (!atomic_read(&sess
->session_stop_active
)) {
4067 atomic_set(&sess
->session_stop_active
, 1);
4068 spin_unlock_bh(&sess
->conn_lock
);
4069 iscsit_stop_session(sess
, 0, 0);
4072 spin_unlock_bh(&sess
->conn_lock
);
4077 * If this was the last connection in the session and one of the
4078 * following is occurring:
4080 * Session Reinstatement is not being performed, and are falling back
4081 * to ERL=0 call iscsit_close_session().
4083 * Session Logout was requested. iscsit_close_session() will be called
4086 * Session Continuation is not being performed, start the Time2Retain
4087 * handler and check if sleep_on_sess_wait_sem is active.
4089 if (!atomic_read(&sess
->session_reinstatement
) &&
4090 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4091 spin_unlock_bh(&sess
->conn_lock
);
4092 target_put_session(sess
->se_sess
);
4095 } else if (atomic_read(&sess
->session_logout
)) {
4096 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4097 sess
->session_state
= TARG_SESS_STATE_FREE
;
4098 spin_unlock_bh(&sess
->conn_lock
);
4100 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4101 complete(&sess
->session_wait_comp
);
4105 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4106 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4108 if (!atomic_read(&sess
->session_continuation
)) {
4109 spin_unlock_bh(&sess
->conn_lock
);
4110 iscsit_start_time2retain_handler(sess
);
4112 spin_unlock_bh(&sess
->conn_lock
);
4114 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4115 complete(&sess
->session_wait_comp
);
4119 spin_unlock_bh(&sess
->conn_lock
);
4124 int iscsit_close_session(struct iscsi_session
*sess
)
4126 struct iscsi_portal_group
*tpg
= ISCSI_TPG_S(sess
);
4127 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4129 if (atomic_read(&sess
->nconn
)) {
4130 pr_err("%d connection(s) still exist for iSCSI session"
4131 " to %s\n", atomic_read(&sess
->nconn
),
4132 sess
->sess_ops
->InitiatorName
);
4136 spin_lock_bh(&se_tpg
->session_lock
);
4137 atomic_set(&sess
->session_logout
, 1);
4138 atomic_set(&sess
->session_reinstatement
, 1);
4139 iscsit_stop_time2retain_timer(sess
);
4140 spin_unlock_bh(&se_tpg
->session_lock
);
4143 * transport_deregister_session_configfs() will clear the
4144 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4145 * can be setting it again with __transport_register_session() in
4146 * iscsi_post_login_handler() again after the iscsit_stop_session()
4147 * completes in iscsi_np context.
4149 transport_deregister_session_configfs(sess
->se_sess
);
4152 * If any other processes are accessing this session pointer we must
4153 * wait until they have completed. If we are in an interrupt (the
4154 * time2retain handler) and contain and active session usage count we
4155 * restart the timer and exit.
4157 if (!in_interrupt()) {
4158 if (iscsit_check_session_usage_count(sess
) == 1)
4159 iscsit_stop_session(sess
, 1, 1);
4161 if (iscsit_check_session_usage_count(sess
) == 2) {
4162 atomic_set(&sess
->session_logout
, 0);
4163 iscsit_start_time2retain_handler(sess
);
4168 transport_deregister_session(sess
->se_sess
);
4170 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4171 iscsit_free_connection_recovery_entires(sess
);
4173 iscsit_free_all_ooo_cmdsns(sess
);
4175 spin_lock_bh(&se_tpg
->session_lock
);
4176 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4177 sess
->session_state
= TARG_SESS_STATE_FREE
;
4178 pr_debug("Released iSCSI session from node: %s\n",
4179 sess
->sess_ops
->InitiatorName
);
4182 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4184 pr_debug("Decremented number of active iSCSI Sessions on"
4185 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4187 spin_lock(&sess_idr_lock
);
4188 idr_remove(&sess_idr
, sess
->session_index
);
4189 spin_unlock(&sess_idr_lock
);
4191 kfree(sess
->sess_ops
);
4192 sess
->sess_ops
= NULL
;
4193 spin_unlock_bh(&se_tpg
->session_lock
);
4199 static void iscsit_logout_post_handler_closesession(
4200 struct iscsi_conn
*conn
)
4202 struct iscsi_session
*sess
= conn
->sess
;
4204 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4205 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4207 atomic_set(&conn
->conn_logout_remove
, 0);
4208 complete(&conn
->conn_logout_comp
);
4210 iscsit_dec_conn_usage_count(conn
);
4211 iscsit_stop_session(sess
, 1, 1);
4212 iscsit_dec_session_usage_count(sess
);
4213 target_put_session(sess
->se_sess
);
4216 static void iscsit_logout_post_handler_samecid(
4217 struct iscsi_conn
*conn
)
4219 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4220 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4222 atomic_set(&conn
->conn_logout_remove
, 0);
4223 complete(&conn
->conn_logout_comp
);
4225 iscsit_cause_connection_reinstatement(conn
, 1);
4226 iscsit_dec_conn_usage_count(conn
);
4229 static void iscsit_logout_post_handler_diffcid(
4230 struct iscsi_conn
*conn
,
4233 struct iscsi_conn
*l_conn
;
4234 struct iscsi_session
*sess
= conn
->sess
;
4239 spin_lock_bh(&sess
->conn_lock
);
4240 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4241 if (l_conn
->cid
== cid
) {
4242 iscsit_inc_conn_usage_count(l_conn
);
4246 spin_unlock_bh(&sess
->conn_lock
);
4252 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4254 spin_lock_bh(&l_conn
->state_lock
);
4255 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4256 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4257 spin_unlock_bh(&l_conn
->state_lock
);
4259 iscsit_cause_connection_reinstatement(l_conn
, 1);
4260 iscsit_dec_conn_usage_count(l_conn
);
4264 * Return of 0 causes the TX thread to restart.
4266 static int iscsit_logout_post_handler(
4267 struct iscsi_cmd
*cmd
,
4268 struct iscsi_conn
*conn
)
4272 switch (cmd
->logout_reason
) {
4273 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4274 switch (cmd
->logout_response
) {
4275 case ISCSI_LOGOUT_SUCCESS
:
4276 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4278 iscsit_logout_post_handler_closesession(conn
);
4283 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4284 if (conn
->cid
== cmd
->logout_cid
) {
4285 switch (cmd
->logout_response
) {
4286 case ISCSI_LOGOUT_SUCCESS
:
4287 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4289 iscsit_logout_post_handler_samecid(conn
);
4294 switch (cmd
->logout_response
) {
4295 case ISCSI_LOGOUT_SUCCESS
:
4296 iscsit_logout_post_handler_diffcid(conn
,
4299 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4300 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4307 case ISCSI_LOGOUT_REASON_RECOVERY
:
4308 switch (cmd
->logout_response
) {
4309 case ISCSI_LOGOUT_SUCCESS
:
4310 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4311 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4312 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4325 void iscsit_fail_session(struct iscsi_session
*sess
)
4327 struct iscsi_conn
*conn
;
4329 spin_lock_bh(&sess
->conn_lock
);
4330 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4331 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4332 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4334 spin_unlock_bh(&sess
->conn_lock
);
4336 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4337 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4340 int iscsit_free_session(struct iscsi_session
*sess
)
4342 u16 conn_count
= atomic_read(&sess
->nconn
);
4343 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4346 spin_lock_bh(&sess
->conn_lock
);
4347 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4349 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4351 if (conn_count
== 0)
4354 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4357 iscsit_inc_conn_usage_count(conn_tmp
);
4360 iscsit_inc_conn_usage_count(conn
);
4362 spin_unlock_bh(&sess
->conn_lock
);
4363 iscsit_cause_connection_reinstatement(conn
, 1);
4364 spin_lock_bh(&sess
->conn_lock
);
4366 iscsit_dec_conn_usage_count(conn
);
4368 iscsit_dec_conn_usage_count(conn_tmp
);
4373 if (atomic_read(&sess
->nconn
)) {
4374 spin_unlock_bh(&sess
->conn_lock
);
4375 wait_for_completion(&sess
->session_wait_comp
);
4377 spin_unlock_bh(&sess
->conn_lock
);
4379 target_put_session(sess
->se_sess
);
4383 void iscsit_stop_session(
4384 struct iscsi_session
*sess
,
4386 int connection_sleep
)
4388 u16 conn_count
= atomic_read(&sess
->nconn
);
4389 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4392 spin_lock_bh(&sess
->conn_lock
);
4394 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4396 if (connection_sleep
) {
4397 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4399 if (conn_count
== 0)
4402 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4405 iscsit_inc_conn_usage_count(conn_tmp
);
4408 iscsit_inc_conn_usage_count(conn
);
4410 spin_unlock_bh(&sess
->conn_lock
);
4411 iscsit_cause_connection_reinstatement(conn
, 1);
4412 spin_lock_bh(&sess
->conn_lock
);
4414 iscsit_dec_conn_usage_count(conn
);
4416 iscsit_dec_conn_usage_count(conn_tmp
);
4420 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4421 iscsit_cause_connection_reinstatement(conn
, 0);
4424 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4425 spin_unlock_bh(&sess
->conn_lock
);
4426 wait_for_completion(&sess
->session_wait_comp
);
4428 spin_unlock_bh(&sess
->conn_lock
);
4431 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4433 struct iscsi_session
*sess
;
4434 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4435 struct se_session
*se_sess
, *se_sess_tmp
;
4436 int session_count
= 0;
4438 spin_lock_bh(&se_tpg
->session_lock
);
4439 if (tpg
->nsessions
&& !force
) {
4440 spin_unlock_bh(&se_tpg
->session_lock
);
4444 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4446 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4448 spin_lock(&sess
->conn_lock
);
4449 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4450 atomic_read(&sess
->session_logout
) ||
4451 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4452 spin_unlock(&sess
->conn_lock
);
4455 atomic_set(&sess
->session_reinstatement
, 1);
4456 spin_unlock(&sess
->conn_lock
);
4457 spin_unlock_bh(&se_tpg
->session_lock
);
4459 iscsit_free_session(sess
);
4460 spin_lock_bh(&se_tpg
->session_lock
);
4464 spin_unlock_bh(&se_tpg
->session_lock
);
4466 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4467 " Group: %hu\n", session_count
, tpg
->tpgt
);
4471 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4472 MODULE_VERSION("4.1.x");
4473 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4474 MODULE_LICENSE("GPL");
4476 module_init(iscsi_target_init_module
);
4477 module_exit(iscsi_target_cleanup_module
);