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 <asm/unaligned.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/iscsi_proto.h>
29 #include <target/target_core_base.h>
30 #include <target/target_core_tmr.h>
31 #include <target/target_core_transport.h>
33 #include "iscsi_target_core.h"
34 #include "iscsi_target_parameters.h"
35 #include "iscsi_target_seq_pdu_list.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_configfs.h"
38 #include "iscsi_target_datain_values.h"
39 #include "iscsi_target_erl0.h"
40 #include "iscsi_target_erl1.h"
41 #include "iscsi_target_erl2.h"
42 #include "iscsi_target_login.h"
43 #include "iscsi_target_tmr.h"
44 #include "iscsi_target_tpg.h"
45 #include "iscsi_target_util.h"
46 #include "iscsi_target.h"
47 #include "iscsi_target_device.h"
48 #include "iscsi_target_stat.h"
50 static LIST_HEAD(g_tiqn_list
);
51 static LIST_HEAD(g_np_list
);
52 static DEFINE_SPINLOCK(tiqn_lock
);
53 static DEFINE_SPINLOCK(np_lock
);
55 static struct idr tiqn_idr
;
57 struct mutex auth_id_lock
;
58 spinlock_t sess_idr_lock
;
60 struct iscsit_global
*iscsit_global
;
62 struct kmem_cache
*lio_cmd_cache
;
63 struct kmem_cache
*lio_qr_cache
;
64 struct kmem_cache
*lio_dr_cache
;
65 struct kmem_cache
*lio_ooo_cache
;
66 struct kmem_cache
*lio_r2t_cache
;
68 static int iscsit_handle_immediate_data(struct iscsi_cmd
*,
69 unsigned char *buf
, u32
);
70 static int iscsit_logout_post_handler(struct iscsi_cmd
*, struct iscsi_conn
*);
72 struct iscsi_tiqn
*iscsit_get_tiqn_for_login(unsigned char *buf
)
74 struct iscsi_tiqn
*tiqn
= NULL
;
76 spin_lock(&tiqn_lock
);
77 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
78 if (!strcmp(tiqn
->tiqn
, buf
)) {
80 spin_lock(&tiqn
->tiqn_state_lock
);
81 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
82 tiqn
->tiqn_access_count
++;
83 spin_unlock(&tiqn
->tiqn_state_lock
);
84 spin_unlock(&tiqn_lock
);
87 spin_unlock(&tiqn
->tiqn_state_lock
);
90 spin_unlock(&tiqn_lock
);
95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn
*tiqn
)
97 spin_lock(&tiqn
->tiqn_state_lock
);
98 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
99 tiqn
->tiqn_state
= TIQN_STATE_SHUTDOWN
;
100 spin_unlock(&tiqn
->tiqn_state_lock
);
103 spin_unlock(&tiqn
->tiqn_state_lock
);
108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn
*tiqn
)
110 spin_lock(&tiqn
->tiqn_state_lock
);
111 tiqn
->tiqn_access_count
--;
112 spin_unlock(&tiqn
->tiqn_state_lock
);
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
119 struct iscsi_tiqn
*iscsit_add_tiqn(unsigned char *buf
)
121 struct iscsi_tiqn
*tiqn
= NULL
;
124 if (strlen(buf
) >= ISCSI_IQN_LEN
) {
125 pr_err("Target IQN exceeds %d bytes\n",
127 return ERR_PTR(-EINVAL
);
130 tiqn
= kzalloc(sizeof(struct iscsi_tiqn
), GFP_KERNEL
);
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM
);
136 sprintf(tiqn
->tiqn
, "%s", buf
);
137 INIT_LIST_HEAD(&tiqn
->tiqn_list
);
138 INIT_LIST_HEAD(&tiqn
->tiqn_tpg_list
);
139 spin_lock_init(&tiqn
->tiqn_state_lock
);
140 spin_lock_init(&tiqn
->tiqn_tpg_lock
);
141 spin_lock_init(&tiqn
->sess_err_stats
.lock
);
142 spin_lock_init(&tiqn
->login_stats
.lock
);
143 spin_lock_init(&tiqn
->logout_stats
.lock
);
145 if (!idr_pre_get(&tiqn_idr
, GFP_KERNEL
)) {
146 pr_err("idr_pre_get() for tiqn_idr failed\n");
148 return ERR_PTR(-ENOMEM
);
150 tiqn
->tiqn_state
= TIQN_STATE_ACTIVE
;
152 spin_lock(&tiqn_lock
);
153 ret
= idr_get_new(&tiqn_idr
, NULL
, &tiqn
->tiqn_index
);
155 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
156 spin_unlock(&tiqn_lock
);
160 list_add_tail(&tiqn
->tiqn_list
, &g_tiqn_list
);
161 spin_unlock(&tiqn_lock
);
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn
->tiqn
);
169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn
*tiqn
)
172 * Wait for accesses to said struct iscsi_tiqn to end.
174 spin_lock(&tiqn
->tiqn_state_lock
);
175 while (tiqn
->tiqn_access_count
!= 0) {
176 spin_unlock(&tiqn
->tiqn_state_lock
);
178 spin_lock(&tiqn
->tiqn_state_lock
);
180 spin_unlock(&tiqn
->tiqn_state_lock
);
183 void iscsit_del_tiqn(struct iscsi_tiqn
*tiqn
)
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
191 if (iscsit_set_tiqn_shutdown(tiqn
) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
196 iscsit_wait_for_tiqn(tiqn
);
198 spin_lock(&tiqn_lock
);
199 list_del(&tiqn
->tiqn_list
);
200 idr_remove(&tiqn_idr
, tiqn
->tiqn_index
);
201 spin_unlock(&tiqn_lock
);
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 int iscsit_access_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
)
212 * Determine if the network portal is accepting storage traffic.
214 spin_lock_bh(&np
->np_thread_lock
);
215 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
216 spin_unlock_bh(&np
->np_thread_lock
);
219 if (np
->np_login_tpg
) {
220 pr_err("np->np_login_tpg() is not NULL!\n");
221 spin_unlock_bh(&np
->np_thread_lock
);
224 spin_unlock_bh(&np
->np_thread_lock
);
226 * Determine if the portal group is accepting storage traffic.
228 spin_lock_bh(&tpg
->tpg_state_lock
);
229 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
230 spin_unlock_bh(&tpg
->tpg_state_lock
);
233 spin_unlock_bh(&tpg
->tpg_state_lock
);
236 * Here we serialize access across the TIQN+TPG Tuple.
238 ret
= mutex_lock_interruptible(&tpg
->np_login_lock
);
239 if ((ret
!= 0) || signal_pending(current
))
242 spin_lock_bh(&np
->np_thread_lock
);
243 np
->np_login_tpg
= tpg
;
244 spin_unlock_bh(&np
->np_thread_lock
);
249 int iscsit_deaccess_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
)
251 struct iscsi_tiqn
*tiqn
= tpg
->tpg_tiqn
;
253 spin_lock_bh(&np
->np_thread_lock
);
254 np
->np_login_tpg
= NULL
;
255 spin_unlock_bh(&np
->np_thread_lock
);
257 mutex_unlock(&tpg
->np_login_lock
);
260 iscsit_put_tiqn_for_login(tiqn
);
265 static struct iscsi_np
*iscsit_get_np(
266 struct __kernel_sockaddr_storage
*sockaddr
,
267 int network_transport
)
269 struct sockaddr_in
*sock_in
, *sock_in_e
;
270 struct sockaddr_in6
*sock_in6
, *sock_in6_e
;
275 spin_lock_bh(&np_lock
);
276 list_for_each_entry(np
, &g_np_list
, np_list
) {
277 spin_lock(&np
->np_thread_lock
);
278 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
279 spin_unlock(&np
->np_thread_lock
);
283 if (sockaddr
->ss_family
== AF_INET6
) {
284 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
285 sock_in6_e
= (struct sockaddr_in6
*)&np
->np_sockaddr
;
287 if (!memcmp((void *)&sock_in6
->sin6_addr
.in6_u
,
288 (void *)&sock_in6_e
->sin6_addr
.in6_u
,
289 sizeof(struct in6_addr
)))
292 port
= ntohs(sock_in6
->sin6_port
);
294 sock_in
= (struct sockaddr_in
*)sockaddr
;
295 sock_in_e
= (struct sockaddr_in
*)&np
->np_sockaddr
;
297 if (sock_in
->sin_addr
.s_addr
==
298 sock_in_e
->sin_addr
.s_addr
)
301 port
= ntohs(sock_in
->sin_port
);
304 if ((ip_match
== 1) && (np
->np_port
== port
) &&
305 (np
->np_network_transport
== network_transport
)) {
307 * Increment the np_exports reference count now to
308 * prevent iscsit_del_np() below from being called
309 * while iscsi_tpg_add_network_portal() is called.
312 spin_unlock(&np
->np_thread_lock
);
313 spin_unlock_bh(&np_lock
);
316 spin_unlock(&np
->np_thread_lock
);
318 spin_unlock_bh(&np_lock
);
323 struct iscsi_np
*iscsit_add_np(
324 struct __kernel_sockaddr_storage
*sockaddr
,
326 int network_transport
)
328 struct sockaddr_in
*sock_in
;
329 struct sockaddr_in6
*sock_in6
;
333 * Locate the existing struct iscsi_np if already active..
335 np
= iscsit_get_np(sockaddr
, network_transport
);
339 np
= kzalloc(sizeof(struct iscsi_np
), GFP_KERNEL
);
341 pr_err("Unable to allocate memory for struct iscsi_np\n");
342 return ERR_PTR(-ENOMEM
);
345 np
->np_flags
|= NPF_IP_NETWORK
;
346 if (sockaddr
->ss_family
== AF_INET6
) {
347 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
348 snprintf(np
->np_ip
, IPV6_ADDRESS_SPACE
, "%s", ip_str
);
349 np
->np_port
= ntohs(sock_in6
->sin6_port
);
351 sock_in
= (struct sockaddr_in
*)sockaddr
;
352 sprintf(np
->np_ip
, "%s", ip_str
);
353 np
->np_port
= ntohs(sock_in
->sin_port
);
356 np
->np_network_transport
= network_transport
;
357 spin_lock_init(&np
->np_thread_lock
);
358 init_completion(&np
->np_restart_comp
);
359 INIT_LIST_HEAD(&np
->np_list
);
361 ret
= iscsi_target_setup_login_socket(np
, sockaddr
);
367 np
->np_thread
= kthread_run(iscsi_target_login_thread
, np
, "iscsi_np");
368 if (IS_ERR(np
->np_thread
)) {
369 pr_err("Unable to create kthread: iscsi_np\n");
370 ret
= PTR_ERR(np
->np_thread
);
375 * Increment the np_exports reference count now to prevent
376 * iscsit_del_np() below from being run while a new call to
377 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
378 * active. We don't need to hold np->np_thread_lock at this
379 * point because iscsi_np has not been added to g_np_list yet.
383 spin_lock_bh(&np_lock
);
384 list_add_tail(&np
->np_list
, &g_np_list
);
385 spin_unlock_bh(&np_lock
);
387 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
388 np
->np_ip
, np
->np_port
, (np
->np_network_transport
== ISCSI_TCP
) ?
394 int iscsit_reset_np_thread(
396 struct iscsi_tpg_np
*tpg_np
,
397 struct iscsi_portal_group
*tpg
)
399 spin_lock_bh(&np
->np_thread_lock
);
402 * The reset operation need only be performed when the
403 * passed struct iscsi_portal_group has a login in progress
404 * to one of the network portals.
406 if (tpg_np
->tpg_np
->np_login_tpg
!= tpg
) {
407 spin_unlock_bh(&np
->np_thread_lock
);
411 if (np
->np_thread_state
== ISCSI_NP_THREAD_INACTIVE
) {
412 spin_unlock_bh(&np
->np_thread_lock
);
415 np
->np_thread_state
= ISCSI_NP_THREAD_RESET
;
418 spin_unlock_bh(&np
->np_thread_lock
);
419 send_sig(SIGINT
, np
->np_thread
, 1);
420 wait_for_completion(&np
->np_restart_comp
);
421 spin_lock_bh(&np
->np_thread_lock
);
423 spin_unlock_bh(&np
->np_thread_lock
);
428 int iscsit_del_np_comm(struct iscsi_np
*np
)
434 * Some network transports allocate their own struct sock->file,
435 * see if we need to free any additional allocated resources.
437 if (np
->np_flags
& NPF_SCTP_STRUCT_FILE
) {
438 kfree(np
->np_socket
->file
);
439 np
->np_socket
->file
= NULL
;
442 sock_release(np
->np_socket
);
446 int iscsit_del_np(struct iscsi_np
*np
)
448 spin_lock_bh(&np
->np_thread_lock
);
450 if (np
->np_exports
) {
451 spin_unlock_bh(&np
->np_thread_lock
);
454 np
->np_thread_state
= ISCSI_NP_THREAD_SHUTDOWN
;
455 spin_unlock_bh(&np
->np_thread_lock
);
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
462 send_sig(SIGINT
, np
->np_thread
, 1);
463 kthread_stop(np
->np_thread
);
465 iscsit_del_np_comm(np
);
467 spin_lock_bh(&np_lock
);
468 list_del(&np
->np_list
);
469 spin_unlock_bh(&np_lock
);
471 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
472 np
->np_ip
, np
->np_port
, (np
->np_network_transport
== ISCSI_TCP
) ?
479 static int __init
iscsi_target_init_module(void)
483 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
485 iscsit_global
= kzalloc(sizeof(struct iscsit_global
), GFP_KERNEL
);
486 if (!iscsit_global
) {
487 pr_err("Unable to allocate memory for iscsit_global\n");
490 mutex_init(&auth_id_lock
);
491 spin_lock_init(&sess_idr_lock
);
495 ret
= iscsi_target_register_configfs();
499 ret
= iscsi_thread_set_init();
503 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT
) !=
504 TARGET_THREAD_SET_COUNT
) {
505 pr_err("iscsi_allocate_thread_sets() returned"
506 " unexpected value!\n");
510 lio_cmd_cache
= kmem_cache_create("lio_cmd_cache",
511 sizeof(struct iscsi_cmd
), __alignof__(struct iscsi_cmd
),
513 if (!lio_cmd_cache
) {
514 pr_err("Unable to kmem_cache_create() for"
519 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
520 sizeof(struct iscsi_queue_req
),
521 __alignof__(struct iscsi_queue_req
), 0, NULL
);
523 pr_err("nable to kmem_cache_create() for"
528 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
529 sizeof(struct iscsi_datain_req
),
530 __alignof__(struct iscsi_datain_req
), 0, NULL
);
532 pr_err("Unable to kmem_cache_create() for"
537 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
538 sizeof(struct iscsi_ooo_cmdsn
),
539 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
540 if (!lio_ooo_cache
) {
541 pr_err("Unable to kmem_cache_create() for"
546 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
547 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
549 if (!lio_r2t_cache
) {
550 pr_err("Unable to kmem_cache_create() for"
555 if (iscsit_load_discovery_tpg() < 0)
560 kmem_cache_destroy(lio_r2t_cache
);
562 kmem_cache_destroy(lio_ooo_cache
);
564 kmem_cache_destroy(lio_dr_cache
);
566 kmem_cache_destroy(lio_qr_cache
);
568 kmem_cache_destroy(lio_cmd_cache
);
570 iscsi_deallocate_thread_sets();
572 iscsi_thread_set_free();
574 iscsi_target_deregister_configfs();
576 kfree(iscsit_global
);
580 static void __exit
iscsi_target_cleanup_module(void)
582 iscsi_deallocate_thread_sets();
583 iscsi_thread_set_free();
584 iscsit_release_discovery_tpg();
585 kmem_cache_destroy(lio_cmd_cache
);
586 kmem_cache_destroy(lio_qr_cache
);
587 kmem_cache_destroy(lio_dr_cache
);
588 kmem_cache_destroy(lio_ooo_cache
);
589 kmem_cache_destroy(lio_r2t_cache
);
591 iscsi_target_deregister_configfs();
593 kfree(iscsit_global
);
596 int iscsit_add_reject(
600 struct iscsi_conn
*conn
)
602 struct iscsi_cmd
*cmd
;
603 struct iscsi_reject
*hdr
;
606 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
610 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
612 cmd
->cmd_flags
|= ICF_REJECT_FAIL_CONN
;
614 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
615 hdr
->reason
= reason
;
617 cmd
->buf_ptr
= kzalloc(ISCSI_HDR_LEN
, GFP_KERNEL
);
619 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
620 iscsit_release_cmd(cmd
);
623 memcpy(cmd
->buf_ptr
, buf
, ISCSI_HDR_LEN
);
625 spin_lock_bh(&conn
->cmd_lock
);
626 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
627 spin_unlock_bh(&conn
->cmd_lock
);
629 cmd
->i_state
= ISTATE_SEND_REJECT
;
630 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
632 ret
= wait_for_completion_interruptible(&cmd
->reject_comp
);
636 return (!fail_conn
) ? 0 : -1;
639 int iscsit_add_reject_from_cmd(
644 struct iscsi_cmd
*cmd
)
646 struct iscsi_conn
*conn
;
647 struct iscsi_reject
*hdr
;
651 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
657 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
659 cmd
->cmd_flags
|= ICF_REJECT_FAIL_CONN
;
661 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
662 hdr
->reason
= reason
;
664 cmd
->buf_ptr
= kzalloc(ISCSI_HDR_LEN
, GFP_KERNEL
);
666 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
667 iscsit_release_cmd(cmd
);
670 memcpy(cmd
->buf_ptr
, buf
, ISCSI_HDR_LEN
);
673 spin_lock_bh(&conn
->cmd_lock
);
674 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
675 spin_unlock_bh(&conn
->cmd_lock
);
678 cmd
->i_state
= ISTATE_SEND_REJECT
;
679 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
681 ret
= wait_for_completion_interruptible(&cmd
->reject_comp
);
685 return (!fail_conn
) ? 0 : -1;
689 * Map some portion of the allocated scatterlist to an iovec, suitable for
690 * kernel sockets to copy data in/out. This handles both pages and slab-allocated
691 * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
692 * either case (see iscsit_alloc_buffs)
694 static int iscsit_map_iovec(
695 struct iscsi_cmd
*cmd
,
701 struct scatterlist
*sg
;
702 unsigned int page_off
;
705 * We have a private mapping of the allocated pages in t_mem_sg.
706 * At this point, we also know each contains a page.
708 sg
= &cmd
->t_mem_sg
[data_offset
/ PAGE_SIZE
];
709 page_off
= (data_offset
% PAGE_SIZE
);
711 cmd
->first_data_sg
= sg
;
712 cmd
->first_data_sg_off
= page_off
;
714 while (data_length
) {
715 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
717 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
718 iov
[i
].iov_len
= cur_len
;
720 data_length
-= cur_len
;
726 cmd
->kmapped_nents
= i
;
731 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
734 struct scatterlist
*sg
;
736 sg
= cmd
->first_data_sg
;
738 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
739 kunmap(sg_page(&sg
[i
]));
742 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
744 struct iscsi_cmd
*cmd
;
746 conn
->exp_statsn
= exp_statsn
;
748 spin_lock_bh(&conn
->cmd_lock
);
749 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_list
) {
750 spin_lock(&cmd
->istate_lock
);
751 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
752 (cmd
->stat_sn
< exp_statsn
)) {
753 cmd
->i_state
= ISTATE_REMOVE
;
754 spin_unlock(&cmd
->istate_lock
);
755 iscsit_add_cmd_to_immediate_queue(cmd
, conn
,
759 spin_unlock(&cmd
->istate_lock
);
761 spin_unlock_bh(&conn
->cmd_lock
);
764 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
766 u32 iov_count
= (cmd
->se_cmd
.t_data_nents
== 0) ? 1 :
767 cmd
->se_cmd
.t_data_nents
;
769 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
771 cmd
->iov_data
= kzalloc(iov_count
* sizeof(struct kvec
), GFP_KERNEL
);
772 if (!cmd
->iov_data
) {
773 pr_err("Unable to allocate cmd->iov_data\n");
777 cmd
->orig_iov_data_count
= iov_count
;
781 static int iscsit_alloc_buffs(struct iscsi_cmd
*cmd
)
783 struct scatterlist
*sgl
;
784 u32 length
= cmd
->se_cmd
.data_length
;
785 int nents
= DIV_ROUND_UP(length
, PAGE_SIZE
);
788 * If no SCSI payload is present, allocate the default iovecs used for
792 return iscsit_allocate_iovecs(cmd
);
794 sgl
= kzalloc(sizeof(*sgl
) * nents
, GFP_KERNEL
);
798 sg_init_table(sgl
, nents
);
801 int buf_size
= min_t(int, length
, PAGE_SIZE
);
804 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
806 goto page_alloc_failed
;
808 sg_set_page(&sgl
[i
], page
, buf_size
, 0);
815 cmd
->t_mem_sg_nents
= nents
;
817 /* BIDI ops not supported */
819 /* Tell the core about our preallocated memory */
820 transport_generic_map_mem_to_cmd(&cmd
->se_cmd
, sgl
, nents
, NULL
, 0);
822 * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
823 * so that cmd->se_cmd.t_tasks_se_num has been set.
825 ret
= iscsit_allocate_iovecs(cmd
);
827 goto page_alloc_failed
;
833 __free_page(sg_page(&sgl
[i
]));
836 kfree(cmd
->t_mem_sg
);
837 cmd
->t_mem_sg
= NULL
;
841 static int iscsit_handle_scsi_cmd(
842 struct iscsi_conn
*conn
,
845 int data_direction
, cmdsn_ret
= 0, immed_ret
, ret
, transport_ret
;
846 int dump_immediate_data
= 0, send_check_condition
= 0, payload_length
;
847 struct iscsi_cmd
*cmd
= NULL
;
848 struct iscsi_scsi_req
*hdr
;
850 spin_lock_bh(&conn
->sess
->session_stats_lock
);
851 conn
->sess
->cmd_pdus
++;
852 if (conn
->sess
->se_sess
->se_node_acl
) {
853 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
854 conn
->sess
->se_sess
->se_node_acl
->num_cmds
++;
855 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
857 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
859 hdr
= (struct iscsi_scsi_req
*) buf
;
860 payload_length
= ntoh24(hdr
->dlength
);
861 hdr
->itt
= be32_to_cpu(hdr
->itt
);
862 hdr
->data_length
= be32_to_cpu(hdr
->data_length
);
863 hdr
->cmdsn
= be32_to_cpu(hdr
->cmdsn
);
864 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
866 /* FIXME; Add checks for AdditionalHeaderSegment */
868 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
869 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
870 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
871 " not set. Bad iSCSI Initiator.\n");
872 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
876 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
877 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
879 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
880 * that adds support for RESERVE/RELEASE. There is a bug
881 * add with this new functionality that sets R/W bits when
882 * neither CDB carries any READ or WRITE datapayloads.
884 if ((hdr
->cdb
[0] == 0x16) || (hdr
->cdb
[0] == 0x17)) {
885 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
886 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
890 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
891 " set when Expected Data Transfer Length is 0 for"
892 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr
->cdb
[0]);
893 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
898 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
899 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
900 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
901 " MUST be set if Expected Data Transfer Length is not 0."
902 " Bad iSCSI Initiator\n");
903 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
907 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
908 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
909 pr_err("Bidirectional operations not supported!\n");
910 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
914 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
915 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
916 " Scsi Command PDU.\n");
917 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
921 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
922 pr_err("ImmediateData=No but DataSegmentLength=%u,"
923 " protocol error.\n", payload_length
);
924 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
928 if ((hdr
->data_length
== payload_length
) &&
929 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
930 pr_err("Expected Data Transfer Length and Length of"
931 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
932 " bit is not set protocol error\n");
933 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
937 if (payload_length
> hdr
->data_length
) {
938 pr_err("DataSegmentLength: %u is greater than"
939 " EDTL: %u, protocol error.\n", payload_length
,
941 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
945 if (payload_length
> conn
->conn_ops
->MaxRecvDataSegmentLength
) {
946 pr_err("DataSegmentLength: %u is greater than"
947 " MaxRecvDataSegmentLength: %u, protocol error.\n",
948 payload_length
, conn
->conn_ops
->MaxRecvDataSegmentLength
);
949 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
953 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
954 pr_err("DataSegmentLength: %u is greater than"
955 " FirstBurstLength: %u, protocol error.\n",
956 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
957 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID
, 1,
961 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
962 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
965 cmd
= iscsit_allocate_se_cmd(conn
, hdr
->data_length
, data_direction
,
966 (hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
));
968 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
, 1,
971 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
972 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
973 hdr
->cmdsn
, hdr
->data_length
, payload_length
, conn
->cid
);
975 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
976 cmd
->i_state
= ISTATE_NEW_CMD
;
977 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
978 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
979 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
980 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
981 if (cmd
->unsolicited_data
)
982 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
984 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
985 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
) {
986 spin_lock_bh(&conn
->sess
->ttt_lock
);
987 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
988 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
989 cmd
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
990 spin_unlock_bh(&conn
->sess
->ttt_lock
);
991 } else if (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)
992 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
993 cmd
->cmd_sn
= hdr
->cmdsn
;
994 cmd
->exp_stat_sn
= hdr
->exp_statsn
;
995 cmd
->first_burst_len
= payload_length
;
997 if (cmd
->data_direction
== DMA_FROM_DEVICE
) {
998 struct iscsi_datain_req
*dr
;
1000 dr
= iscsit_allocate_datain_req();
1002 return iscsit_add_reject_from_cmd(
1003 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1006 iscsit_attach_datain_req(cmd
, dr
);
1010 * The CDB is going to an se_device_t.
1012 ret
= iscsit_get_lun_for_cmd(cmd
, hdr
->cdb
,
1013 get_unaligned_le64(&hdr
->lun
));
1015 if (cmd
->se_cmd
.scsi_sense_reason
== TCM_NON_EXISTENT_LUN
) {
1016 pr_debug("Responding to non-acl'ed,"
1017 " non-existent or non-exported iSCSI LUN:"
1018 " 0x%016Lx\n", get_unaligned_le64(&hdr
->lun
));
1020 if (ret
== PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES
)
1021 return iscsit_add_reject_from_cmd(
1022 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1025 send_check_condition
= 1;
1029 * The Initiator Node has access to the LUN (the addressing method
1030 * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to
1031 * allocate 1->N transport tasks (depending on sector count and
1032 * maximum request size the physical HBA(s) can handle.
1034 transport_ret
= transport_generic_allocate_tasks(&cmd
->se_cmd
, hdr
->cdb
);
1035 if (transport_ret
== -ENOMEM
) {
1036 return iscsit_add_reject_from_cmd(
1037 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1039 } else if (transport_ret
== -EINVAL
) {
1041 * Unsupported SAM Opcode. CHECK_CONDITION will be sent
1042 * in iscsit_execute_cmd() during the CmdSN OOO Execution
1045 send_check_condition
= 1;
1047 if (iscsit_decide_list_to_build(cmd
, payload_length
) < 0)
1048 return iscsit_add_reject_from_cmd(
1049 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1054 spin_lock_bh(&conn
->cmd_lock
);
1055 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
1056 spin_unlock_bh(&conn
->cmd_lock
);
1058 * Check if we need to delay processing because of ALUA
1059 * Active/NonOptimized primary access state..
1061 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1063 * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1064 * also call iscsit_allocate_iovecs()
1066 ret
= iscsit_alloc_buffs(cmd
);
1068 return iscsit_add_reject_from_cmd(
1069 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1072 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1073 * the Immediate Bit is not set, and no Immediate
1076 * A PDU/CmdSN carrying Immediate Data can only
1077 * be processed after the DataCRC has passed.
1078 * If the DataCRC fails, the CmdSN MUST NOT
1079 * be acknowledged. (See below)
1081 if (!cmd
->immediate_data
) {
1082 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1083 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1085 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1086 return iscsit_add_reject_from_cmd(
1087 ISCSI_REASON_PROTOCOL_ERROR
,
1091 iscsit_ack_from_expstatsn(conn
, hdr
->exp_statsn
);
1094 * If no Immediate Data is attached, it's OK to return now.
1096 if (!cmd
->immediate_data
) {
1097 if (send_check_condition
)
1100 if (cmd
->unsolicited_data
) {
1101 iscsit_set_dataout_sequence_values(cmd
);
1103 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1104 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1105 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1112 * Early CHECK_CONDITIONs never make it to the transport processing
1113 * thread. They are processed in CmdSN order by
1114 * iscsit_check_received_cmdsn() below.
1116 if (send_check_condition
) {
1117 immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1118 dump_immediate_data
= 1;
1119 goto after_immediate_data
;
1122 * Call directly into transport_generic_new_cmd() to perform
1123 * the backend memory allocation.
1125 ret
= transport_generic_new_cmd(&cmd
->se_cmd
);
1126 if ((ret
< 0) || (cmd
->se_cmd
.se_cmd_flags
& SCF_SE_CMD_FAILED
)) {
1127 immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1128 dump_immediate_data
= 1;
1129 goto after_immediate_data
;
1132 immed_ret
= iscsit_handle_immediate_data(cmd
, buf
, payload_length
);
1133 after_immediate_data
:
1134 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1136 * A PDU/CmdSN carrying Immediate Data passed
1137 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1138 * Immediate Bit is not set.
1140 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1142 * Special case for Unsupported SAM WRITE Opcodes
1143 * and ImmediateData=Yes.
1145 if (dump_immediate_data
) {
1146 if (iscsit_dump_data_payload(conn
, payload_length
, 1) < 0)
1148 } else if (cmd
->unsolicited_data
) {
1149 iscsit_set_dataout_sequence_values(cmd
);
1151 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1152 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1153 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1156 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1157 return iscsit_add_reject_from_cmd(
1158 ISCSI_REASON_PROTOCOL_ERROR
,
1161 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1163 * Immediate Data failed DataCRC and ERL>=1,
1164 * silently drop this PDU and let the initiator
1165 * plug the CmdSN gap.
1167 * FIXME: Send Unsolicited NOPIN with reserved
1168 * TTT here to help the initiator figure out
1169 * the missing CmdSN, although they should be
1170 * intelligent enough to determine the missing
1171 * CmdSN and issue a retry to plug the sequence.
1173 cmd
->i_state
= ISTATE_REMOVE
;
1174 iscsit_add_cmd_to_immediate_queue(cmd
, conn
, cmd
->i_state
);
1175 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1181 static u32
iscsit_do_crypto_hash_sg(
1182 struct hash_desc
*hash
,
1183 struct iscsi_cmd
*cmd
,
1191 struct scatterlist
*sg
;
1192 unsigned int page_off
;
1194 crypto_hash_init(hash
);
1196 sg
= cmd
->first_data_sg
;
1197 page_off
= cmd
->first_data_sg_off
;
1200 while (data_length
) {
1201 u32 cur_len
= min_t(u32
, data_length
, (sg
[i
].length
- page_off
));
1203 crypto_hash_update(hash
, &sg
[i
], cur_len
);
1205 data_length
-= cur_len
;
1211 struct scatterlist pad_sg
;
1213 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1214 crypto_hash_update(hash
, &pad_sg
, padding
);
1216 crypto_hash_final(hash
, (u8
*) &data_crc
);
1221 static void iscsit_do_crypto_hash_buf(
1222 struct hash_desc
*hash
,
1229 struct scatterlist sg
;
1231 crypto_hash_init(hash
);
1233 sg_init_one(&sg
, (u8
*)buf
, payload_length
);
1234 crypto_hash_update(hash
, &sg
, payload_length
);
1237 sg_init_one(&sg
, pad_bytes
, padding
);
1238 crypto_hash_update(hash
, &sg
, padding
);
1240 crypto_hash_final(hash
, data_crc
);
1243 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1245 int iov_ret
, ooo_cmdsn
= 0, ret
;
1246 u8 data_crc_failed
= 0;
1247 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0;
1248 u32 rx_size
= 0, payload_length
;
1249 struct iscsi_cmd
*cmd
= NULL
;
1250 struct se_cmd
*se_cmd
;
1251 struct iscsi_data
*hdr
;
1253 unsigned long flags
;
1255 hdr
= (struct iscsi_data
*) buf
;
1256 payload_length
= ntoh24(hdr
->dlength
);
1257 hdr
->itt
= be32_to_cpu(hdr
->itt
);
1258 hdr
->ttt
= be32_to_cpu(hdr
->ttt
);
1259 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
1260 hdr
->datasn
= be32_to_cpu(hdr
->datasn
);
1261 hdr
->offset
= be32_to_cpu(hdr
->offset
);
1263 if (!payload_length
) {
1264 pr_err("DataOUT payload is ZERO, protocol error.\n");
1265 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1270 spin_lock_bh(&conn
->sess
->session_stats_lock
);
1271 conn
->sess
->rx_data_octets
+= payload_length
;
1272 if (conn
->sess
->se_sess
->se_node_acl
) {
1273 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
1274 conn
->sess
->se_sess
->se_node_acl
->write_bytes
+= payload_length
;
1275 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
1277 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
1279 if (payload_length
> conn
->conn_ops
->MaxRecvDataSegmentLength
) {
1280 pr_err("DataSegmentLength: %u is greater than"
1281 " MaxRecvDataSegmentLength: %u\n", payload_length
,
1282 conn
->conn_ops
->MaxRecvDataSegmentLength
);
1283 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1287 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
,
1292 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1293 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1294 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, hdr
->offset
,
1295 payload_length
, conn
->cid
);
1297 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1298 pr_err("Command ITT: 0x%08x received DataOUT after"
1299 " last DataOUT received, dumping payload\n",
1300 cmd
->init_task_tag
);
1301 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1304 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1305 pr_err("Command ITT: 0x%08x received DataOUT for a"
1306 " NON-WRITE command.\n", cmd
->init_task_tag
);
1307 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR
,
1310 se_cmd
= &cmd
->se_cmd
;
1311 iscsit_mod_dataout_timer(cmd
);
1313 if ((hdr
->offset
+ payload_length
) > cmd
->data_length
) {
1314 pr_err("DataOut Offset: %u, Length %u greater than"
1315 " iSCSI Command EDTL %u, protocol error.\n",
1316 hdr
->offset
, payload_length
, cmd
->data_length
);
1317 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID
,
1321 if (cmd
->unsolicited_data
) {
1322 int dump_unsolicited_data
= 0;
1324 if (conn
->sess
->sess_ops
->InitialR2T
) {
1325 pr_err("Received unexpected unsolicited data"
1326 " while InitialR2T=Yes, protocol error.\n");
1327 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1328 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1332 * Special case for dealing with Unsolicited DataOUT
1333 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1337 /* Something's amiss if we're not in WRITE_PENDING state... */
1338 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1339 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1340 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1342 spin_lock_irqsave(&se_cmd
->t_state_lock
, flags
);
1343 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
) ||
1344 (se_cmd
->se_cmd_flags
& SCF_SE_CMD_FAILED
))
1345 dump_unsolicited_data
= 1;
1346 spin_unlock_irqrestore(&se_cmd
->t_state_lock
, flags
);
1348 if (dump_unsolicited_data
) {
1350 * Check if a delayed TASK_ABORTED status needs to
1351 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1352 * received with the unsolicitied data out.
1354 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1355 iscsit_stop_dataout_timer(cmd
);
1357 transport_check_aborted_status(se_cmd
,
1358 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1359 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1363 * For the normal solicited data path:
1365 * Check for a delayed TASK_ABORTED status and dump any
1366 * incoming data out payload if one exists. Also, when the
1367 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1368 * data out sequence, we decrement outstanding_r2ts. Once
1369 * outstanding_r2ts reaches zero, go ahead and send the delayed
1370 * TASK_ABORTED status.
1372 if (atomic_read(&se_cmd
->t_transport_aborted
) != 0) {
1373 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1374 if (--cmd
->outstanding_r2ts
< 1) {
1375 iscsit_stop_dataout_timer(cmd
);
1376 transport_check_aborted_status(
1380 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1384 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1385 * within-command recovery checks before receiving the payload.
1387 ret
= iscsit_check_pre_dataout(cmd
, buf
);
1388 if (ret
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1390 else if (ret
== DATAOUT_CANNOT_RECOVER
)
1393 rx_size
+= payload_length
;
1394 iov
= &cmd
->iov_data
[0];
1396 iov_ret
= iscsit_map_iovec(cmd
, iov
, hdr
->offset
, payload_length
);
1400 iov_count
+= iov_ret
;
1402 padding
= ((-payload_length
) & 3);
1404 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1405 iov
[iov_count
++].iov_len
= padding
;
1407 pr_debug("Receiving %u padding bytes.\n", padding
);
1410 if (conn
->conn_ops
->DataDigest
) {
1411 iov
[iov_count
].iov_base
= &checksum
;
1412 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1413 rx_size
+= ISCSI_CRC_LEN
;
1416 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1418 iscsit_unmap_iovec(cmd
);
1420 if (rx_got
!= rx_size
)
1423 if (conn
->conn_ops
->DataDigest
) {
1426 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
1427 hdr
->offset
, payload_length
, padding
,
1430 if (checksum
!= data_crc
) {
1431 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1432 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1433 " does not match computed 0x%08x\n",
1434 hdr
->itt
, hdr
->offset
, payload_length
,
1435 hdr
->datasn
, checksum
, data_crc
);
1436 data_crc_failed
= 1;
1438 pr_debug("Got CRC32C DataDigest 0x%08x for"
1439 " %u bytes of Data Out\n", checksum
,
1444 * Increment post receive data and CRC values or perform
1445 * within-command recovery.
1447 ret
= iscsit_check_post_dataout(cmd
, buf
, data_crc_failed
);
1448 if ((ret
== DATAOUT_NORMAL
) || (ret
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1450 else if (ret
== DATAOUT_SEND_R2T
) {
1451 iscsit_set_dataout_sequence_values(cmd
);
1452 iscsit_build_r2ts_for_cmd(cmd
, conn
, 0);
1453 } else if (ret
== DATAOUT_SEND_TO_TRANSPORT
) {
1455 * Handle extra special case for out of order
1456 * Unsolicited Data Out.
1458 spin_lock_bh(&cmd
->istate_lock
);
1459 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1460 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1461 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1462 spin_unlock_bh(&cmd
->istate_lock
);
1464 iscsit_stop_dataout_timer(cmd
);
1465 return (!ooo_cmdsn
) ? transport_generic_handle_data(
1467 } else /* DATAOUT_CANNOT_RECOVER */
1473 static int iscsit_handle_nop_out(
1474 struct iscsi_conn
*conn
,
1477 unsigned char *ping_data
= NULL
;
1478 int cmdsn_ret
, niov
= 0, ret
= 0, rx_got
, rx_size
;
1479 u32 checksum
, data_crc
, padding
= 0, payload_length
;
1481 struct iscsi_cmd
*cmd
= NULL
;
1482 struct kvec
*iov
= NULL
;
1483 struct iscsi_nopout
*hdr
;
1485 hdr
= (struct iscsi_nopout
*) buf
;
1486 payload_length
= ntoh24(hdr
->dlength
);
1487 lun
= get_unaligned_le64(&hdr
->lun
);
1488 hdr
->itt
= be32_to_cpu(hdr
->itt
);
1489 hdr
->ttt
= be32_to_cpu(hdr
->ttt
);
1490 hdr
->cmdsn
= be32_to_cpu(hdr
->cmdsn
);
1491 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
1493 if ((hdr
->itt
== 0xFFFFFFFF) && !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1494 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1495 " not set, protocol error.\n");
1496 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1500 if (payload_length
> conn
->conn_ops
->MaxRecvDataSegmentLength
) {
1501 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1502 " greater than MaxRecvDataSegmentLength: %u, protocol"
1503 " error.\n", payload_length
,
1504 conn
->conn_ops
->MaxRecvDataSegmentLength
);
1505 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1509 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1510 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1511 (hdr
->itt
== 0xFFFFFFFF) ? "Response" : "Request",
1512 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1515 * This is not a response to a Unsolicited NopIN, which means
1516 * it can either be a NOPOUT ping request (with a valid ITT),
1517 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1518 * Either way, make sure we allocate an struct iscsi_cmd, as both
1519 * can contain ping data.
1521 if (hdr
->ttt
== 0xFFFFFFFF) {
1522 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
1524 return iscsit_add_reject(
1525 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1528 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1529 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1530 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1532 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1533 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1534 cmd
->cmd_sn
= hdr
->cmdsn
;
1535 cmd
->exp_stat_sn
= hdr
->exp_statsn
;
1536 cmd
->data_direction
= DMA_NONE
;
1539 if (payload_length
&& (hdr
->ttt
== 0xFFFFFFFF)) {
1540 rx_size
= payload_length
;
1541 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1543 pr_err("Unable to allocate memory for"
1544 " NOPOUT ping data.\n");
1549 iov
= &cmd
->iov_misc
[0];
1550 iov
[niov
].iov_base
= ping_data
;
1551 iov
[niov
++].iov_len
= payload_length
;
1553 padding
= ((-payload_length
) & 3);
1555 pr_debug("Receiving %u additional bytes"
1556 " for padding.\n", padding
);
1557 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1558 iov
[niov
++].iov_len
= padding
;
1561 if (conn
->conn_ops
->DataDigest
) {
1562 iov
[niov
].iov_base
= &checksum
;
1563 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1564 rx_size
+= ISCSI_CRC_LEN
;
1567 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1568 if (rx_got
!= rx_size
) {
1573 if (conn
->conn_ops
->DataDigest
) {
1574 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1575 ping_data
, payload_length
,
1576 padding
, cmd
->pad_bytes
,
1579 if (checksum
!= data_crc
) {
1580 pr_err("Ping data CRC32C DataDigest"
1581 " 0x%08x does not match computed 0x%08x\n",
1582 checksum
, data_crc
);
1583 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1584 pr_err("Unable to recover from"
1585 " NOPOUT Ping DataCRC failure while in"
1591 * Silently drop this PDU and let the
1592 * initiator plug the CmdSN gap.
1594 pr_debug("Dropping NOPOUT"
1595 " Command CmdSN: 0x%08x due to"
1596 " DataCRC error.\n", hdr
->cmdsn
);
1601 pr_debug("Got CRC32C DataDigest"
1602 " 0x%08x for %u bytes of ping data.\n",
1603 checksum
, payload_length
);
1607 ping_data
[payload_length
] = '\0';
1609 * Attach ping data to struct iscsi_cmd->buf_ptr.
1611 cmd
->buf_ptr
= (void *)ping_data
;
1612 cmd
->buf_ptr_size
= payload_length
;
1614 pr_debug("Got %u bytes of NOPOUT ping"
1615 " data.\n", payload_length
);
1616 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1619 if (hdr
->itt
!= 0xFFFFFFFF) {
1621 pr_err("Checking CmdSN for NOPOUT,"
1622 " but cmd is NULL!\n");
1626 * Initiator is expecting a NopIN ping reply,
1628 spin_lock_bh(&conn
->cmd_lock
);
1629 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
1630 spin_unlock_bh(&conn
->cmd_lock
);
1632 iscsit_ack_from_expstatsn(conn
, hdr
->exp_statsn
);
1634 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1635 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1640 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1641 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1645 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1646 return iscsit_add_reject_from_cmd(
1647 ISCSI_REASON_PROTOCOL_ERROR
,
1653 if (hdr
->ttt
!= 0xFFFFFFFF) {
1655 * This was a response to a unsolicited NOPIN ping.
1657 cmd
= iscsit_find_cmd_from_ttt(conn
, hdr
->ttt
);
1661 iscsit_stop_nopin_response_timer(conn
);
1663 cmd
->i_state
= ISTATE_REMOVE
;
1664 iscsit_add_cmd_to_immediate_queue(cmd
, conn
, cmd
->i_state
);
1665 iscsit_start_nopin_timer(conn
);
1668 * Initiator is not expecting a NOPIN is response.
1669 * Just ignore for now.
1671 * iSCSI v19-91 10.18
1672 * "A NOP-OUT may also be used to confirm a changed
1673 * ExpStatSN if another PDU will not be available
1683 iscsit_release_cmd(cmd
);
1689 static int iscsit_handle_task_mgt_cmd(
1690 struct iscsi_conn
*conn
,
1693 struct iscsi_cmd
*cmd
;
1694 struct se_tmr_req
*se_tmr
;
1695 struct iscsi_tmr_req
*tmr_req
;
1696 struct iscsi_tm
*hdr
;
1698 int out_of_order_cmdsn
= 0;
1702 hdr
= (struct iscsi_tm
*) buf
;
1703 payload_length
= ntoh24(hdr
->dlength
);
1704 hdr
->itt
= be32_to_cpu(hdr
->itt
);
1705 hdr
->rtt
= be32_to_cpu(hdr
->rtt
);
1706 hdr
->cmdsn
= be32_to_cpu(hdr
->cmdsn
);
1707 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
1708 hdr
->refcmdsn
= be32_to_cpu(hdr
->refcmdsn
);
1709 hdr
->exp_datasn
= be32_to_cpu(hdr
->exp_datasn
);
1710 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1711 function
= hdr
->flags
;
1713 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1714 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1715 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1716 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1718 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1719 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1720 (hdr
->rtt
!= ISCSI_RESERVED_TAG
))) {
1721 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1722 hdr
->rtt
= ISCSI_RESERVED_TAG
;
1725 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1726 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1727 pr_err("Task Management Request TASK_REASSIGN not"
1728 " issued as immediate command, bad iSCSI Initiator"
1729 "implementation\n");
1730 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1733 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1734 (hdr
->refcmdsn
!= ISCSI_RESERVED_TAG
))
1735 hdr
->refcmdsn
= ISCSI_RESERVED_TAG
;
1737 cmd
= iscsit_allocate_se_cmd_for_tmr(conn
, function
);
1739 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1742 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
1743 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
1744 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1745 cmd
->init_task_tag
= hdr
->itt
;
1746 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1747 cmd
->cmd_sn
= hdr
->cmdsn
;
1748 cmd
->exp_stat_sn
= hdr
->exp_statsn
;
1749 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
1750 tmr_req
= cmd
->tmr_req
;
1752 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1754 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1755 ret
= iscsit_get_lun_for_tmr(cmd
,
1756 get_unaligned_le64(&hdr
->lun
));
1758 cmd
->se_cmd
.se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1759 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
1765 case ISCSI_TM_FUNC_ABORT_TASK
:
1766 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
1767 if (se_tmr
->response
!= ISCSI_TMF_RSP_COMPLETE
) {
1768 cmd
->se_cmd
.se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1772 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1773 case ISCSI_TM_FUNC_CLEAR_ACA
:
1774 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1775 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1777 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1778 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
1779 cmd
->se_cmd
.se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1780 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1784 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1785 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
1786 cmd
->se_cmd
.se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1787 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
1791 case ISCSI_TM_FUNC_TASK_REASSIGN
:
1792 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
1794 * Perform sanity checks on the ExpDataSN only if the
1795 * TASK_REASSIGN was successful.
1797 if (se_tmr
->response
!= ISCSI_TMF_RSP_COMPLETE
)
1800 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
1801 return iscsit_add_reject_from_cmd(
1802 ISCSI_REASON_BOOKMARK_INVALID
, 1, 1,
1806 pr_err("Unknown TMR function: 0x%02x, protocol"
1807 " error.\n", function
);
1808 cmd
->se_cmd
.se_cmd_flags
|= SCF_SCSI_CDB_EXCEPTION
;
1809 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
1813 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1814 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
1815 se_tmr
->call_transport
= 1;
1817 spin_lock_bh(&conn
->cmd_lock
);
1818 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
1819 spin_unlock_bh(&conn
->cmd_lock
);
1821 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1822 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
1823 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
1824 out_of_order_cmdsn
= 1;
1825 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1827 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1828 return iscsit_add_reject_from_cmd(
1829 ISCSI_REASON_PROTOCOL_ERROR
,
1832 iscsit_ack_from_expstatsn(conn
, hdr
->exp_statsn
);
1834 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
1837 * Found the referenced task, send to transport for processing.
1839 if (se_tmr
->call_transport
)
1840 return transport_generic_handle_tmr(&cmd
->se_cmd
);
1843 * Could not find the referenced LUN, task, or Task Management
1844 * command not authorized or supported. Change state and
1845 * let the tx_thread send the response.
1847 * For connection recovery, this is also the default action for
1848 * TMR TASK_REASSIGN.
1850 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
1854 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1855 static int iscsit_handle_text_cmd(
1856 struct iscsi_conn
*conn
,
1859 char *text_ptr
, *text_in
;
1860 int cmdsn_ret
, niov
= 0, rx_got
, rx_size
;
1861 u32 checksum
= 0, data_crc
= 0, payload_length
;
1862 u32 padding
= 0, pad_bytes
= 0, text_length
= 0;
1863 struct iscsi_cmd
*cmd
;
1865 struct iscsi_text
*hdr
;
1867 hdr
= (struct iscsi_text
*) buf
;
1868 payload_length
= ntoh24(hdr
->dlength
);
1869 hdr
->itt
= be32_to_cpu(hdr
->itt
);
1870 hdr
->ttt
= be32_to_cpu(hdr
->ttt
);
1871 hdr
->cmdsn
= be32_to_cpu(hdr
->cmdsn
);
1872 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
1874 if (payload_length
> conn
->conn_ops
->MaxRecvDataSegmentLength
) {
1875 pr_err("Unable to accept text parameter length: %u"
1876 "greater than MaxRecvDataSegmentLength %u.\n",
1877 payload_length
, conn
->conn_ops
->MaxRecvDataSegmentLength
);
1878 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
1882 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1883 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
1884 hdr
->exp_statsn
, payload_length
);
1886 rx_size
= text_length
= payload_length
;
1888 text_in
= kzalloc(text_length
, GFP_KERNEL
);
1890 pr_err("Unable to allocate memory for"
1891 " incoming text parameters\n");
1895 memset(iov
, 0, 3 * sizeof(struct kvec
));
1896 iov
[niov
].iov_base
= text_in
;
1897 iov
[niov
++].iov_len
= text_length
;
1899 padding
= ((-payload_length
) & 3);
1901 iov
[niov
].iov_base
= &pad_bytes
;
1902 iov
[niov
++].iov_len
= padding
;
1904 pr_debug("Receiving %u additional bytes"
1905 " for padding.\n", padding
);
1907 if (conn
->conn_ops
->DataDigest
) {
1908 iov
[niov
].iov_base
= &checksum
;
1909 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1910 rx_size
+= ISCSI_CRC_LEN
;
1913 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
1914 if (rx_got
!= rx_size
) {
1919 if (conn
->conn_ops
->DataDigest
) {
1920 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
1921 text_in
, text_length
,
1922 padding
, (u8
*)&pad_bytes
,
1925 if (checksum
!= data_crc
) {
1926 pr_err("Text data CRC32C DataDigest"
1927 " 0x%08x does not match computed"
1928 " 0x%08x\n", checksum
, data_crc
);
1929 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1930 pr_err("Unable to recover from"
1931 " Text Data digest failure while in"
1937 * Silently drop this PDU and let the
1938 * initiator plug the CmdSN gap.
1940 pr_debug("Dropping Text"
1941 " Command CmdSN: 0x%08x due to"
1942 " DataCRC error.\n", hdr
->cmdsn
);
1947 pr_debug("Got CRC32C DataDigest"
1948 " 0x%08x for %u bytes of text data.\n",
1949 checksum
, text_length
);
1952 text_in
[text_length
- 1] = '\0';
1953 pr_debug("Successfully read %d bytes of text"
1954 " data.\n", text_length
);
1956 if (strncmp("SendTargets", text_in
, 11) != 0) {
1957 pr_err("Received Text Data that is not"
1958 " SendTargets, cannot continue.\n");
1962 text_ptr
= strchr(text_in
, '=');
1964 pr_err("No \"=\" separator found in Text Data,"
1965 " cannot continue.\n");
1969 if (strncmp("=All", text_ptr
, 4) != 0) {
1970 pr_err("Unable to locate All value for"
1971 " SendTargets key, cannot continue.\n");
1975 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1979 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
1981 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1984 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
1985 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
1986 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1987 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1988 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1989 cmd
->cmd_sn
= hdr
->cmdsn
;
1990 cmd
->exp_stat_sn
= hdr
->exp_statsn
;
1991 cmd
->data_direction
= DMA_NONE
;
1993 spin_lock_bh(&conn
->cmd_lock
);
1994 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
1995 spin_unlock_bh(&conn
->cmd_lock
);
1997 iscsit_ack_from_expstatsn(conn
, hdr
->exp_statsn
);
1999 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2000 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
2001 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2002 return iscsit_add_reject_from_cmd(
2003 ISCSI_REASON_PROTOCOL_ERROR
,
2009 return iscsit_execute_cmd(cmd
, 0);
2012 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2014 struct iscsi_conn
*conn_p
;
2015 struct iscsi_session
*sess
= conn
->sess
;
2017 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2018 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2020 atomic_set(&sess
->session_logout
, 1);
2021 atomic_set(&conn
->conn_logout_remove
, 1);
2022 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2024 iscsit_inc_conn_usage_count(conn
);
2025 iscsit_inc_session_usage_count(sess
);
2027 spin_lock_bh(&sess
->conn_lock
);
2028 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2029 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2032 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2033 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2035 spin_unlock_bh(&sess
->conn_lock
);
2037 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2042 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2044 struct iscsi_conn
*l_conn
;
2045 struct iscsi_session
*sess
= conn
->sess
;
2047 pr_debug("Received logout request CLOSECONNECTION for CID:"
2048 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2051 * A Logout Request with a CLOSECONNECTION reason code for a CID
2052 * can arrive on a connection with a differing CID.
2054 if (conn
->cid
== cmd
->logout_cid
) {
2055 spin_lock_bh(&conn
->state_lock
);
2056 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2057 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2059 atomic_set(&conn
->conn_logout_remove
, 1);
2060 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2061 iscsit_inc_conn_usage_count(conn
);
2063 spin_unlock_bh(&conn
->state_lock
);
2066 * Handle all different cid CLOSECONNECTION requests in
2067 * iscsit_logout_post_handler_diffcid() as to give enough
2068 * time for any non immediate command's CmdSN to be
2069 * acknowledged on the connection in question.
2071 * Here we simply make sure the CID is still around.
2073 l_conn
= iscsit_get_conn_from_cid(sess
,
2076 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2077 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2082 iscsit_dec_conn_usage_count(l_conn
);
2085 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2090 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2092 struct iscsi_session
*sess
= conn
->sess
;
2094 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2095 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2097 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2098 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2099 " while ERL!=2.\n");
2100 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2101 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2105 if (conn
->cid
== cmd
->logout_cid
) {
2106 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2107 " with CID: %hu on CID: %hu, implementation error.\n",
2108 cmd
->logout_cid
, conn
->cid
);
2109 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2110 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2114 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2119 static int iscsit_handle_logout_cmd(
2120 struct iscsi_conn
*conn
,
2123 int cmdsn_ret
, logout_remove
= 0;
2125 struct iscsi_cmd
*cmd
;
2126 struct iscsi_logout
*hdr
;
2127 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2129 hdr
= (struct iscsi_logout
*) buf
;
2130 reason_code
= (hdr
->flags
& 0x7f);
2131 hdr
->itt
= be32_to_cpu(hdr
->itt
);
2132 hdr
->cid
= be16_to_cpu(hdr
->cid
);
2133 hdr
->cmdsn
= be32_to_cpu(hdr
->cmdsn
);
2134 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
2137 spin_lock(&tiqn
->logout_stats
.lock
);
2138 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2139 tiqn
->logout_stats
.normal_logouts
++;
2141 tiqn
->logout_stats
.abnormal_logouts
++;
2142 spin_unlock(&tiqn
->logout_stats
.lock
);
2145 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2146 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2147 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2148 hdr
->cid
, conn
->cid
);
2150 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2151 pr_err("Received logout request on connection that"
2152 " is not in logged in state, ignoring request.\n");
2156 cmd
= iscsit_allocate_cmd(conn
, GFP_KERNEL
);
2158 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES
, 1,
2161 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2162 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2163 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2164 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2165 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2166 cmd
->cmd_sn
= hdr
->cmdsn
;
2167 cmd
->exp_stat_sn
= hdr
->exp_statsn
;
2168 cmd
->logout_cid
= hdr
->cid
;
2169 cmd
->logout_reason
= reason_code
;
2170 cmd
->data_direction
= DMA_NONE
;
2173 * We need to sleep in these cases (by returning 1) until the Logout
2174 * Response gets sent in the tx thread.
2176 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2177 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2178 (hdr
->cid
== conn
->cid
)))
2181 spin_lock_bh(&conn
->cmd_lock
);
2182 list_add_tail(&cmd
->i_list
, &conn
->conn_cmd_list
);
2183 spin_unlock_bh(&conn
->cmd_lock
);
2185 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2186 iscsit_ack_from_expstatsn(conn
, hdr
->exp_statsn
);
2189 * Immediate commands are executed, well, immediately.
2190 * Non-Immediate Logout Commands are executed in CmdSN order.
2192 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
2193 int ret
= iscsit_execute_cmd(cmd
, 0);
2198 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, hdr
->cmdsn
);
2199 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
2201 } else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
) {
2202 return iscsit_add_reject_from_cmd(
2203 ISCSI_REASON_PROTOCOL_ERROR
,
2208 return logout_remove
;
2211 static int iscsit_handle_snack(
2212 struct iscsi_conn
*conn
,
2217 struct iscsi_snack
*hdr
;
2219 hdr
= (struct iscsi_snack
*) buf
;
2220 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2221 lun
= get_unaligned_le64(&hdr
->lun
);
2222 unpacked_lun
= scsilun_to_int((struct scsi_lun
*)&lun
);
2223 hdr
->itt
= be32_to_cpu(hdr
->itt
);
2224 hdr
->ttt
= be32_to_cpu(hdr
->ttt
);
2225 hdr
->exp_statsn
= be32_to_cpu(hdr
->exp_statsn
);
2226 hdr
->begrun
= be32_to_cpu(hdr
->begrun
);
2227 hdr
->runlength
= be32_to_cpu(hdr
->runlength
);
2229 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2230 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2231 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2232 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2234 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2235 pr_err("Initiator sent SNACK request while in"
2236 " ErrorRecoveryLevel=0.\n");
2237 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2241 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2242 * call from inside iscsi_send_recovery_datain_or_r2t().
2244 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2246 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2247 hdr
->itt
, hdr
->ttt
, hdr
->begrun
, hdr
->runlength
);
2248 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2249 return iscsit_handle_status_snack(conn
, hdr
->itt
, hdr
->ttt
,
2250 hdr
->begrun
, hdr
->runlength
);
2251 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2252 return iscsit_handle_data_ack(conn
, hdr
->ttt
, hdr
->begrun
,
2254 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2255 /* FIXME: Support R-Data SNACK */
2256 pr_err("R-Data SNACK Not Supported.\n");
2257 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2260 pr_err("Unknown SNACK type 0x%02x, protocol"
2261 " error.\n", hdr
->flags
& 0x0f);
2262 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
2269 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2271 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2272 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2273 wait_for_completion_interruptible_timeout(
2274 &conn
->rx_half_close_comp
,
2275 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2279 static int iscsit_handle_immediate_data(
2280 struct iscsi_cmd
*cmd
,
2284 int iov_ret
, rx_got
= 0, rx_size
= 0;
2285 u32 checksum
, iov_count
= 0, padding
= 0;
2286 struct iscsi_conn
*conn
= cmd
->conn
;
2289 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2291 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2294 iov_count
= iov_ret
;
2295 iov
= &cmd
->iov_data
[0];
2297 padding
= ((-length
) & 3);
2299 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2300 iov
[iov_count
++].iov_len
= padding
;
2304 if (conn
->conn_ops
->DataDigest
) {
2305 iov
[iov_count
].iov_base
= &checksum
;
2306 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2307 rx_size
+= ISCSI_CRC_LEN
;
2310 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2312 iscsit_unmap_iovec(cmd
);
2314 if (rx_got
!= rx_size
) {
2315 iscsit_rx_thread_wait_for_tcp(conn
);
2316 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2319 if (conn
->conn_ops
->DataDigest
) {
2322 data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_rx_hash
, cmd
,
2323 cmd
->write_data_done
, length
, padding
,
2326 if (checksum
!= data_crc
) {
2327 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2328 " does not match computed 0x%08x\n", checksum
,
2331 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2332 pr_err("Unable to recover from"
2333 " Immediate Data digest failure while"
2335 iscsit_add_reject_from_cmd(
2336 ISCSI_REASON_DATA_DIGEST_ERROR
,
2338 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2340 iscsit_add_reject_from_cmd(
2341 ISCSI_REASON_DATA_DIGEST_ERROR
,
2343 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2346 pr_debug("Got CRC32C DataDigest 0x%08x for"
2347 " %u bytes of Immediate Data\n", checksum
,
2352 cmd
->write_data_done
+= length
;
2354 if (cmd
->write_data_done
== cmd
->data_length
) {
2355 spin_lock_bh(&cmd
->istate_lock
);
2356 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2357 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2358 spin_unlock_bh(&cmd
->istate_lock
);
2361 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2365 * Called with sess->conn_lock held.
2367 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2368 with active network interface */
2369 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2371 struct iscsi_cmd
*cmd
;
2372 struct iscsi_conn
*conn_p
;
2375 * Only send a Asynchronous Message on connections whos network
2376 * interface is still functional.
2378 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2379 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2380 iscsit_inc_conn_usage_count(conn_p
);
2388 cmd
= iscsit_allocate_cmd(conn_p
, GFP_KERNEL
);
2390 iscsit_dec_conn_usage_count(conn_p
);
2394 cmd
->logout_cid
= conn
->cid
;
2395 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2396 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2398 spin_lock_bh(&conn_p
->cmd_lock
);
2399 list_add_tail(&cmd
->i_list
, &conn_p
->conn_cmd_list
);
2400 spin_unlock_bh(&conn_p
->cmd_lock
);
2402 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2403 iscsit_dec_conn_usage_count(conn_p
);
2406 static int iscsit_send_conn_drop_async_message(
2407 struct iscsi_cmd
*cmd
,
2408 struct iscsi_conn
*conn
)
2410 struct iscsi_async
*hdr
;
2412 cmd
->tx_size
= ISCSI_HDR_LEN
;
2413 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2415 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2416 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2417 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2418 cmd
->init_task_tag
= 0xFFFFFFFF;
2419 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2420 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2421 cmd
->stat_sn
= conn
->stat_sn
++;
2422 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2423 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2424 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2425 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2426 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2427 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2428 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2430 if (conn
->conn_ops
->HeaderDigest
) {
2431 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2433 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2434 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2435 0, NULL
, (u8
*)header_digest
);
2437 cmd
->tx_size
+= ISCSI_CRC_LEN
;
2438 pr_debug("Attaching CRC32C HeaderDigest to"
2439 " Async Message 0x%08x\n", *header_digest
);
2442 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2443 cmd
->iov_misc
[0].iov_len
= cmd
->tx_size
;
2444 cmd
->iov_misc_count
= 1;
2446 pr_debug("Sending Connection Dropped Async Message StatSN:"
2447 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2448 cmd
->logout_cid
, conn
->cid
);
2452 static int iscsit_send_data_in(
2453 struct iscsi_cmd
*cmd
,
2454 struct iscsi_conn
*conn
,
2457 int iov_ret
= 0, set_statsn
= 0;
2458 u32 iov_count
= 0, tx_size
= 0;
2459 struct iscsi_datain datain
;
2460 struct iscsi_datain_req
*dr
;
2461 struct iscsi_data_rsp
*hdr
;
2464 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2465 dr
= iscsit_get_datain_values(cmd
, &datain
);
2467 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2468 cmd
->init_task_tag
);
2473 * Be paranoid and double check the logic for now.
2475 if ((datain
.offset
+ datain
.length
) > cmd
->data_length
) {
2476 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2477 " datain.length: %u exceeds cmd->data_length: %u\n",
2478 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2483 spin_lock_bh(&conn
->sess
->session_stats_lock
);
2484 conn
->sess
->tx_data_octets
+= datain
.length
;
2485 if (conn
->sess
->se_sess
->se_node_acl
) {
2486 spin_lock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
2487 conn
->sess
->se_sess
->se_node_acl
->read_bytes
+= datain
.length
;
2488 spin_unlock(&conn
->sess
->se_sess
->se_node_acl
->stats_lock
);
2490 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
2492 * Special case for successfully execution w/ both DATAIN
2495 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2496 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2497 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2499 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2500 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2501 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2502 cmd
->stat_sn
= conn
->stat_sn
++;
2504 } else if (dr
->dr_complete
==
2505 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2509 hdr
= (struct iscsi_data_rsp
*) cmd
->pdu
;
2510 memset(hdr
, 0, ISCSI_HDR_LEN
);
2511 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2512 hdr
->flags
= datain
.flags
;
2513 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2514 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2515 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2516 hdr
->residual_count
= cpu_to_be32(cmd
->residual_count
);
2517 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2518 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2519 hdr
->residual_count
= cpu_to_be32(cmd
->residual_count
);
2522 hton24(hdr
->dlength
, datain
.length
);
2523 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2524 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2525 (struct scsi_lun
*)&hdr
->lun
);
2527 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2529 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
2530 hdr
->ttt
= (hdr
->flags
& ISCSI_FLAG_DATA_ACK
) ?
2531 cpu_to_be32(cmd
->targ_xfer_tag
) :
2533 hdr
->statsn
= (set_statsn
) ? cpu_to_be32(cmd
->stat_sn
) :
2535 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2536 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2537 hdr
->datasn
= cpu_to_be32(datain
.data_sn
);
2538 hdr
->offset
= cpu_to_be32(datain
.offset
);
2540 iov
= &cmd
->iov_data
[0];
2541 iov
[iov_count
].iov_base
= cmd
->pdu
;
2542 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
2543 tx_size
+= ISCSI_HDR_LEN
;
2545 if (conn
->conn_ops
->HeaderDigest
) {
2546 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2548 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2549 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2550 0, NULL
, (u8
*)header_digest
);
2552 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2553 tx_size
+= ISCSI_CRC_LEN
;
2555 pr_debug("Attaching CRC32 HeaderDigest"
2556 " for DataIN PDU 0x%08x\n", *header_digest
);
2559 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1], datain
.offset
, datain
.length
);
2563 iov_count
+= iov_ret
;
2564 tx_size
+= datain
.length
;
2566 cmd
->padding
= ((-datain
.length
) & 3);
2568 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2569 iov
[iov_count
++].iov_len
= cmd
->padding
;
2570 tx_size
+= cmd
->padding
;
2572 pr_debug("Attaching %u padding bytes\n",
2575 if (conn
->conn_ops
->DataDigest
) {
2576 cmd
->data_crc
= iscsit_do_crypto_hash_sg(&conn
->conn_tx_hash
, cmd
,
2577 datain
.offset
, datain
.length
, cmd
->padding
, cmd
->pad_bytes
);
2579 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
2580 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2581 tx_size
+= ISCSI_CRC_LEN
;
2583 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2584 " 0x%08x\n", datain
.length
+cmd
->padding
, cmd
->data_crc
);
2587 cmd
->iov_data_count
= iov_count
;
2588 cmd
->tx_size
= tx_size
;
2590 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2591 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2592 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2593 ntohl(hdr
->offset
), datain
.length
, conn
->cid
);
2595 if (dr
->dr_complete
) {
2596 *eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2598 iscsit_free_datain_req(cmd
, dr
);
2604 static int iscsit_send_logout_response(
2605 struct iscsi_cmd
*cmd
,
2606 struct iscsi_conn
*conn
)
2608 int niov
= 0, tx_size
;
2609 struct iscsi_conn
*logout_conn
= NULL
;
2610 struct iscsi_conn_recovery
*cr
= NULL
;
2611 struct iscsi_session
*sess
= conn
->sess
;
2613 struct iscsi_logout_rsp
*hdr
;
2615 * The actual shutting down of Sessions and/or Connections
2616 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2617 * is done in scsi_logout_post_handler().
2619 switch (cmd
->logout_reason
) {
2620 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2621 pr_debug("iSCSI session logout successful, setting"
2622 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2623 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2626 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2629 * For CLOSECONNECTION logout requests carrying
2630 * a matching logout CID -> local CID, the reference
2631 * for the local CID will have been incremented in
2632 * iscsi_logout_closeconnection().
2634 * For CLOSECONNECTION logout requests carrying
2635 * a different CID than the connection it arrived
2636 * on, the connection responding to cmd->logout_cid
2637 * is stopped in iscsit_logout_post_handler_diffcid().
2640 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2641 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2642 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2644 case ISCSI_LOGOUT_REASON_RECOVERY
:
2645 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2646 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2649 * If the connection is still active from our point of view
2650 * force connection recovery to occur.
2652 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2654 if ((logout_conn
)) {
2655 iscsit_connection_reinstatement_rcfr(logout_conn
);
2656 iscsit_dec_conn_usage_count(logout_conn
);
2659 cr
= iscsit_get_inactive_connection_recovery_entry(
2660 conn
->sess
, cmd
->logout_cid
);
2662 pr_err("Unable to locate CID: %hu for"
2663 " REMOVECONNFORRECOVERY Logout Request.\n",
2665 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2669 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2671 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2672 " for recovery for CID: %hu on CID: %hu successful.\n",
2673 cmd
->logout_cid
, conn
->cid
);
2674 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2677 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2678 cmd
->logout_reason
);
2682 tx_size
= ISCSI_HDR_LEN
;
2683 hdr
= (struct iscsi_logout_rsp
*)cmd
->pdu
;
2684 memset(hdr
, 0, ISCSI_HDR_LEN
);
2685 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2686 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2687 hdr
->response
= cmd
->logout_response
;
2688 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
2689 cmd
->stat_sn
= conn
->stat_sn
++;
2690 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2692 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2693 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2694 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2696 iov
= &cmd
->iov_misc
[0];
2697 iov
[niov
].iov_base
= cmd
->pdu
;
2698 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2700 if (conn
->conn_ops
->HeaderDigest
) {
2701 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2703 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2704 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2705 0, NULL
, (u8
*)header_digest
);
2707 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2708 tx_size
+= ISCSI_CRC_LEN
;
2709 pr_debug("Attaching CRC32C HeaderDigest to"
2710 " Logout Response 0x%08x\n", *header_digest
);
2712 cmd
->iov_misc_count
= niov
;
2713 cmd
->tx_size
= tx_size
;
2715 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2716 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2717 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2718 cmd
->logout_cid
, conn
->cid
);
2724 * Unsolicited NOPIN, either requesting a response or not.
2726 static int iscsit_send_unsolicited_nopin(
2727 struct iscsi_cmd
*cmd
,
2728 struct iscsi_conn
*conn
,
2731 int tx_size
= ISCSI_HDR_LEN
;
2732 struct iscsi_nopin
*hdr
;
2734 hdr
= (struct iscsi_nopin
*) cmd
->pdu
;
2735 memset(hdr
, 0, ISCSI_HDR_LEN
);
2736 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2737 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2738 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
2739 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2740 cmd
->stat_sn
= conn
->stat_sn
;
2741 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2742 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2743 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2745 if (conn
->conn_ops
->HeaderDigest
) {
2746 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2748 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2749 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2750 0, NULL
, (u8
*)header_digest
);
2752 tx_size
+= ISCSI_CRC_LEN
;
2753 pr_debug("Attaching CRC32C HeaderDigest to"
2754 " NopIN 0x%08x\n", *header_digest
);
2757 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2758 cmd
->iov_misc
[0].iov_len
= tx_size
;
2759 cmd
->iov_misc_count
= 1;
2760 cmd
->tx_size
= tx_size
;
2762 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2763 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
2768 static int iscsit_send_nopin_response(
2769 struct iscsi_cmd
*cmd
,
2770 struct iscsi_conn
*conn
)
2772 int niov
= 0, tx_size
;
2775 struct iscsi_nopin
*hdr
;
2777 tx_size
= ISCSI_HDR_LEN
;
2778 hdr
= (struct iscsi_nopin
*) cmd
->pdu
;
2779 memset(hdr
, 0, ISCSI_HDR_LEN
);
2780 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2781 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2782 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2783 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2784 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
2785 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2786 cmd
->stat_sn
= conn
->stat_sn
++;
2787 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2789 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2790 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2791 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2793 iov
= &cmd
->iov_misc
[0];
2794 iov
[niov
].iov_base
= cmd
->pdu
;
2795 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
2797 if (conn
->conn_ops
->HeaderDigest
) {
2798 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2800 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2801 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2802 0, NULL
, (u8
*)header_digest
);
2804 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
2805 tx_size
+= ISCSI_CRC_LEN
;
2806 pr_debug("Attaching CRC32C HeaderDigest"
2807 " to NopIn 0x%08x\n", *header_digest
);
2811 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2812 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2814 if (cmd
->buf_ptr_size
) {
2815 iov
[niov
].iov_base
= cmd
->buf_ptr
;
2816 iov
[niov
++].iov_len
= cmd
->buf_ptr_size
;
2817 tx_size
+= cmd
->buf_ptr_size
;
2819 pr_debug("Echoing back %u bytes of ping"
2820 " data.\n", cmd
->buf_ptr_size
);
2822 padding
= ((-cmd
->buf_ptr_size
) & 3);
2824 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
2825 iov
[niov
++].iov_len
= padding
;
2827 pr_debug("Attaching %u additional"
2828 " padding bytes.\n", padding
);
2830 if (conn
->conn_ops
->DataDigest
) {
2831 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2832 cmd
->buf_ptr
, cmd
->buf_ptr_size
,
2833 padding
, (u8
*)&cmd
->pad_bytes
,
2834 (u8
*)&cmd
->data_crc
);
2836 iov
[niov
].iov_base
= &cmd
->data_crc
;
2837 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2838 tx_size
+= ISCSI_CRC_LEN
;
2839 pr_debug("Attached DataDigest for %u"
2840 " bytes of ping data, CRC 0x%08x\n",
2841 cmd
->buf_ptr_size
, cmd
->data_crc
);
2845 cmd
->iov_misc_count
= niov
;
2846 cmd
->tx_size
= tx_size
;
2848 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2849 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd
->init_task_tag
,
2850 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2855 int iscsit_send_r2t(
2856 struct iscsi_cmd
*cmd
,
2857 struct iscsi_conn
*conn
)
2860 struct iscsi_r2t
*r2t
;
2861 struct iscsi_r2t_rsp
*hdr
;
2863 r2t
= iscsit_get_r2t_from_list(cmd
);
2867 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
2868 memset(hdr
, 0, ISCSI_HDR_LEN
);
2869 hdr
->opcode
= ISCSI_OP_R2T
;
2870 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2871 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2872 (struct scsi_lun
*)&hdr
->lun
);
2873 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
2874 spin_lock_bh(&conn
->sess
->ttt_lock
);
2875 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
2876 if (r2t
->targ_xfer_tag
== 0xFFFFFFFF)
2877 r2t
->targ_xfer_tag
= conn
->sess
->targ_xfer_tag
++;
2878 spin_unlock_bh(&conn
->sess
->ttt_lock
);
2879 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
2880 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
2881 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2882 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
2883 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
2884 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
2885 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
2887 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
2888 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
2889 tx_size
+= ISCSI_HDR_LEN
;
2891 if (conn
->conn_ops
->HeaderDigest
) {
2892 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
2894 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
2895 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
2896 0, NULL
, (u8
*)header_digest
);
2898 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
2899 tx_size
+= ISCSI_CRC_LEN
;
2900 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2901 " PDU 0x%08x\n", *header_digest
);
2904 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2905 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2906 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
2907 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
2908 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
2910 cmd
->iov_misc_count
= 1;
2911 cmd
->tx_size
= tx_size
;
2913 spin_lock_bh(&cmd
->r2t_lock
);
2915 spin_unlock_bh(&cmd
->r2t_lock
);
2921 * type 0: Normal Operation.
2922 * type 1: Called from Storage Transport.
2923 * type 2: Called from iscsi_task_reassign_complete_write() for
2924 * connection recovery.
2926 int iscsit_build_r2ts_for_cmd(
2927 struct iscsi_cmd
*cmd
,
2928 struct iscsi_conn
*conn
,
2932 u32 offset
= 0, xfer_len
= 0;
2934 spin_lock_bh(&cmd
->r2t_lock
);
2935 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
2936 spin_unlock_bh(&cmd
->r2t_lock
);
2940 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&& (type
!= 2))
2941 if (cmd
->r2t_offset
< cmd
->write_data_done
)
2942 cmd
->r2t_offset
= cmd
->write_data_done
;
2944 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
2945 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
2946 offset
= cmd
->r2t_offset
;
2948 if (first_r2t
&& (type
== 2)) {
2949 xfer_len
= ((offset
+
2950 (conn
->sess
->sess_ops
->MaxBurstLength
-
2951 cmd
->next_burst_len
) >
2953 (cmd
->data_length
- offset
) :
2954 (conn
->sess
->sess_ops
->MaxBurstLength
-
2955 cmd
->next_burst_len
));
2957 xfer_len
= ((offset
+
2958 conn
->sess
->sess_ops
->MaxBurstLength
) >
2960 (cmd
->data_length
- offset
) :
2961 conn
->sess
->sess_ops
->MaxBurstLength
;
2963 cmd
->r2t_offset
+= xfer_len
;
2965 if (cmd
->r2t_offset
== cmd
->data_length
)
2966 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
2968 struct iscsi_seq
*seq
;
2970 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
2972 spin_unlock_bh(&cmd
->r2t_lock
);
2976 offset
= seq
->offset
;
2977 xfer_len
= seq
->xfer_len
;
2979 if (cmd
->seq_send_order
== cmd
->seq_count
)
2980 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
2982 cmd
->outstanding_r2ts
++;
2985 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
2986 spin_unlock_bh(&cmd
->r2t_lock
);
2990 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
2993 spin_unlock_bh(&cmd
->r2t_lock
);
2998 static int iscsit_send_status(
2999 struct iscsi_cmd
*cmd
,
3000 struct iscsi_conn
*conn
)
3002 u8 iov_count
= 0, recovery
;
3003 u32 padding
= 0, tx_size
= 0;
3004 struct iscsi_scsi_rsp
*hdr
;
3007 recovery
= (cmd
->i_state
!= ISTATE_SEND_STATUS
);
3009 cmd
->stat_sn
= conn
->stat_sn
++;
3011 spin_lock_bh(&conn
->sess
->session_stats_lock
);
3012 conn
->sess
->rsp_pdus
++;
3013 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
3015 hdr
= (struct iscsi_scsi_rsp
*) cmd
->pdu
;
3016 memset(hdr
, 0, ISCSI_HDR_LEN
);
3017 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3018 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3019 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3020 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3021 hdr
->residual_count
= cpu_to_be32(cmd
->residual_count
);
3022 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3023 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3024 hdr
->residual_count
= cpu_to_be32(cmd
->residual_count
);
3026 hdr
->response
= cmd
->iscsi_response
;
3027 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3028 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
3029 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3031 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3032 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3033 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3035 iov
= &cmd
->iov_misc
[0];
3036 iov
[iov_count
].iov_base
= cmd
->pdu
;
3037 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3038 tx_size
+= ISCSI_HDR_LEN
;
3041 * Attach SENSE DATA payload to iSCSI Response PDU
3043 if (cmd
->se_cmd
.sense_buffer
&&
3044 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3045 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3046 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3047 hton24(hdr
->dlength
, cmd
->se_cmd
.scsi_sense_length
);
3048 iov
[iov_count
].iov_base
= cmd
->se_cmd
.sense_buffer
;
3049 iov
[iov_count
++].iov_len
=
3050 (cmd
->se_cmd
.scsi_sense_length
+ padding
);
3051 tx_size
+= cmd
->se_cmd
.scsi_sense_length
;
3054 memset(cmd
->se_cmd
.sense_buffer
+
3055 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3057 pr_debug("Adding %u bytes of padding to"
3058 " SENSE.\n", padding
);
3061 if (conn
->conn_ops
->DataDigest
) {
3062 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3063 cmd
->se_cmd
.sense_buffer
,
3064 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3065 0, NULL
, (u8
*)&cmd
->data_crc
);
3067 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3068 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3069 tx_size
+= ISCSI_CRC_LEN
;
3071 pr_debug("Attaching CRC32 DataDigest for"
3072 " SENSE, %u bytes CRC 0x%08x\n",
3073 (cmd
->se_cmd
.scsi_sense_length
+ padding
),
3077 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3079 cmd
->se_cmd
.scsi_sense_length
);
3082 if (conn
->conn_ops
->HeaderDigest
) {
3083 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3085 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3086 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3087 0, NULL
, (u8
*)header_digest
);
3089 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3090 tx_size
+= ISCSI_CRC_LEN
;
3091 pr_debug("Attaching CRC32 HeaderDigest for Response"
3092 " PDU 0x%08x\n", *header_digest
);
3095 cmd
->iov_misc_count
= iov_count
;
3096 cmd
->tx_size
= tx_size
;
3098 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3099 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3100 (!recovery
) ? "" : "Recovery ", cmd
->init_task_tag
,
3101 cmd
->stat_sn
, 0x00, cmd
->se_cmd
.scsi_status
, conn
->cid
);
3106 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3108 switch (se_tmr
->response
) {
3109 case TMR_FUNCTION_COMPLETE
:
3110 return ISCSI_TMF_RSP_COMPLETE
;
3111 case TMR_TASK_DOES_NOT_EXIST
:
3112 return ISCSI_TMF_RSP_NO_TASK
;
3113 case TMR_LUN_DOES_NOT_EXIST
:
3114 return ISCSI_TMF_RSP_NO_LUN
;
3115 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3116 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3117 case TMR_FUNCTION_AUTHORIZATION_FAILED
:
3118 return ISCSI_TMF_RSP_AUTH_FAILED
;
3119 case TMR_FUNCTION_REJECTED
:
3121 return ISCSI_TMF_RSP_REJECTED
;
3125 static int iscsit_send_task_mgt_rsp(
3126 struct iscsi_cmd
*cmd
,
3127 struct iscsi_conn
*conn
)
3129 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3130 struct iscsi_tm_rsp
*hdr
;
3133 hdr
= (struct iscsi_tm_rsp
*) cmd
->pdu
;
3134 memset(hdr
, 0, ISCSI_HDR_LEN
);
3135 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3136 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3137 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
3138 cmd
->stat_sn
= conn
->stat_sn
++;
3139 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3141 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3142 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3143 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3145 cmd
->iov_misc
[0].iov_base
= cmd
->pdu
;
3146 cmd
->iov_misc
[0].iov_len
= ISCSI_HDR_LEN
;
3147 tx_size
+= ISCSI_HDR_LEN
;
3149 if (conn
->conn_ops
->HeaderDigest
) {
3150 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3152 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3153 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3154 0, NULL
, (u8
*)header_digest
);
3156 cmd
->iov_misc
[0].iov_len
+= ISCSI_CRC_LEN
;
3157 tx_size
+= ISCSI_CRC_LEN
;
3158 pr_debug("Attaching CRC32 HeaderDigest for Task"
3159 " Mgmt Response PDU 0x%08x\n", *header_digest
);
3162 cmd
->iov_misc_count
= 1;
3163 cmd
->tx_size
= tx_size
;
3165 pr_debug("Built Task Management Response ITT: 0x%08x,"
3166 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3167 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3172 static int iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
)
3174 char *payload
= NULL
;
3175 struct iscsi_conn
*conn
= cmd
->conn
;
3176 struct iscsi_portal_group
*tpg
;
3177 struct iscsi_tiqn
*tiqn
;
3178 struct iscsi_tpg_np
*tpg_np
;
3179 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3180 unsigned char buf
[256];
3182 buffer_len
= (conn
->conn_ops
->MaxRecvDataSegmentLength
> 32768) ?
3183 32768 : conn
->conn_ops
->MaxRecvDataSegmentLength
;
3185 memset(buf
, 0, 256);
3187 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3189 pr_err("Unable to allocate memory for sendtargets"
3194 spin_lock(&tiqn_lock
);
3195 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3196 len
= sprintf(buf
, "TargetName=%s", tiqn
->tiqn
);
3199 if ((len
+ payload_len
) > buffer_len
) {
3200 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3204 memcpy((void *)payload
+ payload_len
, buf
, len
);
3207 spin_lock(&tiqn
->tiqn_tpg_lock
);
3208 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3210 spin_lock(&tpg
->tpg_state_lock
);
3211 if ((tpg
->tpg_state
== TPG_STATE_FREE
) ||
3212 (tpg
->tpg_state
== TPG_STATE_INACTIVE
)) {
3213 spin_unlock(&tpg
->tpg_state_lock
);
3216 spin_unlock(&tpg
->tpg_state_lock
);
3218 spin_lock(&tpg
->tpg_np_lock
);
3219 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3221 len
= sprintf(buf
, "TargetAddress="
3223 (tpg_np
->tpg_np
->np_sockaddr
.ss_family
== AF_INET6
) ?
3224 "[" : "", tpg_np
->tpg_np
->np_ip
,
3225 (tpg_np
->tpg_np
->np_sockaddr
.ss_family
== AF_INET6
) ?
3226 "]" : "", tpg_np
->tpg_np
->np_port
,
3230 if ((len
+ payload_len
) > buffer_len
) {
3231 spin_unlock(&tpg
->tpg_np_lock
);
3232 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3236 memcpy((void *)payload
+ payload_len
, buf
, len
);
3239 spin_unlock(&tpg
->tpg_np_lock
);
3241 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3246 spin_unlock(&tiqn_lock
);
3248 cmd
->buf_ptr
= payload
;
3254 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3255 * MaxRecvDataSegmentLength.
3257 static int iscsit_send_text_rsp(
3258 struct iscsi_cmd
*cmd
,
3259 struct iscsi_conn
*conn
)
3261 struct iscsi_text_rsp
*hdr
;
3263 u32 padding
= 0, tx_size
= 0;
3264 int text_length
, iov_count
= 0;
3266 text_length
= iscsit_build_sendtargets_response(cmd
);
3267 if (text_length
< 0)
3270 padding
= ((-text_length
) & 3);
3272 memset(cmd
->buf_ptr
+ text_length
, 0, padding
);
3273 pr_debug("Attaching %u additional bytes for"
3274 " padding.\n", padding
);
3277 hdr
= (struct iscsi_text_rsp
*) cmd
->pdu
;
3278 memset(hdr
, 0, ISCSI_HDR_LEN
);
3279 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3280 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3281 hton24(hdr
->dlength
, text_length
);
3282 hdr
->itt
= cpu_to_be32(cmd
->init_task_tag
);
3283 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3284 cmd
->stat_sn
= conn
->stat_sn
++;
3285 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3287 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3288 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3289 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3291 iov
= &cmd
->iov_misc
[0];
3293 iov
[iov_count
].iov_base
= cmd
->pdu
;
3294 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3295 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3296 iov
[iov_count
++].iov_len
= text_length
+ padding
;
3298 tx_size
+= (ISCSI_HDR_LEN
+ text_length
+ padding
);
3300 if (conn
->conn_ops
->HeaderDigest
) {
3301 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3303 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3304 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3305 0, NULL
, (u8
*)header_digest
);
3307 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3308 tx_size
+= ISCSI_CRC_LEN
;
3309 pr_debug("Attaching CRC32 HeaderDigest for"
3310 " Text Response PDU 0x%08x\n", *header_digest
);
3313 if (conn
->conn_ops
->DataDigest
) {
3314 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3315 cmd
->buf_ptr
, (text_length
+ padding
),
3316 0, NULL
, (u8
*)&cmd
->data_crc
);
3318 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3319 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3320 tx_size
+= ISCSI_CRC_LEN
;
3322 pr_debug("Attaching DataDigest for %u bytes of text"
3323 " data, CRC 0x%08x\n", (text_length
+ padding
),
3327 cmd
->iov_misc_count
= iov_count
;
3328 cmd
->tx_size
= tx_size
;
3330 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3331 " Length: %u, CID: %hu\n", cmd
->init_task_tag
, cmd
->stat_sn
,
3332 text_length
, conn
->cid
);
3336 static int iscsit_send_reject(
3337 struct iscsi_cmd
*cmd
,
3338 struct iscsi_conn
*conn
)
3340 u32 iov_count
= 0, tx_size
= 0;
3341 struct iscsi_reject
*hdr
;
3344 hdr
= (struct iscsi_reject
*) cmd
->pdu
;
3345 hdr
->opcode
= ISCSI_OP_REJECT
;
3346 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3347 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3348 cmd
->stat_sn
= conn
->stat_sn
++;
3349 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3350 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3351 hdr
->max_cmdsn
= cpu_to_be32(conn
->sess
->max_cmd_sn
);
3353 iov
= &cmd
->iov_misc
[0];
3355 iov
[iov_count
].iov_base
= cmd
->pdu
;
3356 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3357 iov
[iov_count
].iov_base
= cmd
->buf_ptr
;
3358 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
3360 tx_size
= (ISCSI_HDR_LEN
+ ISCSI_HDR_LEN
);
3362 if (conn
->conn_ops
->HeaderDigest
) {
3363 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
3365 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3366 (unsigned char *)hdr
, ISCSI_HDR_LEN
,
3367 0, NULL
, (u8
*)header_digest
);
3369 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
3370 tx_size
+= ISCSI_CRC_LEN
;
3371 pr_debug("Attaching CRC32 HeaderDigest for"
3372 " REJECT PDU 0x%08x\n", *header_digest
);
3375 if (conn
->conn_ops
->DataDigest
) {
3376 iscsit_do_crypto_hash_buf(&conn
->conn_tx_hash
,
3377 (unsigned char *)cmd
->buf_ptr
, ISCSI_HDR_LEN
,
3378 0, NULL
, (u8
*)&cmd
->data_crc
);
3380 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
3381 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
3382 tx_size
+= ISCSI_CRC_LEN
;
3383 pr_debug("Attaching CRC32 DataDigest for REJECT"
3384 " PDU 0x%08x\n", cmd
->data_crc
);
3387 cmd
->iov_misc_count
= iov_count
;
3388 cmd
->tx_size
= tx_size
;
3390 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3391 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3396 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
3398 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
3399 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
3400 wait_for_completion_interruptible_timeout(
3401 &conn
->tx_half_close_comp
,
3402 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
3408 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3410 struct iscsi_thread_set
*ts
= conn
->thread_set
;
3413 * thread_id is assigned from iscsit_global->ts_bitmap from
3414 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3416 * Here we use thread_id to determine which CPU that this
3417 * iSCSI connection's iscsi_thread_set will be scheduled to
3420 ord
= ts
->thread_id
% cpumask_weight(cpu_online_mask
);
3422 pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3423 " thread_id: %d\n", ord
, ts
->thread_id
);
3425 for_each_online_cpu(cpu
) {
3427 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3432 * This should never be reached..
3435 cpumask_setall(conn
->conn_cpumask
);
3438 static inline void iscsit_thread_check_cpumask(
3439 struct iscsi_conn
*conn
,
3440 struct task_struct
*p
,
3445 * mode == 1 signals iscsi_target_tx_thread() usage.
3446 * mode == 0 signals iscsi_target_rx_thread() usage.
3449 if (!conn
->conn_tx_reset_cpumask
)
3451 conn
->conn_tx_reset_cpumask
= 0;
3453 if (!conn
->conn_rx_reset_cpumask
)
3455 conn
->conn_rx_reset_cpumask
= 0;
3458 * Update the CPU mask for this single kthread so that
3459 * both TX and RX kthreads are scheduled to run on the
3462 memset(buf
, 0, 128);
3463 cpumask_scnprintf(buf
, 128, conn
->conn_cpumask
);
3465 pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3466 " %s for %s\n", buf
, p
->comm
);
3468 set_cpus_allowed_ptr(p
, conn
->conn_cpumask
);
3473 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3478 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3479 #endif /* CONFIG_SMP */
3481 int iscsi_target_tx_thread(void *arg
)
3486 int sent_status
= 0;
3489 struct iscsi_cmd
*cmd
= NULL
;
3490 struct iscsi_conn
*conn
;
3491 struct iscsi_queue_req
*qr
= NULL
;
3492 struct se_cmd
*se_cmd
;
3493 struct iscsi_thread_set
*ts
= (struct iscsi_thread_set
*)arg
;
3495 * Allow ourselves to be interrupted by SIGINT so that a
3496 * connection recovery / failure event can be triggered externally.
3498 allow_signal(SIGINT
);
3501 conn
= iscsi_tx_thread_pre_handler(ts
);
3505 eodr
= map_sg
= ret
= sent_status
= use_misc
= 0;
3507 while (!kthread_should_stop()) {
3509 * Ensure that both TX and RX per connection kthreads
3510 * are scheduled to run on the same CPU.
3512 iscsit_thread_check_cpumask(conn
, current
, 1);
3514 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT
);
3516 if ((ts
->status
== ISCSI_THREAD_SET_RESET
) ||
3517 signal_pending(current
))
3521 qr
= iscsit_get_cmd_from_immediate_queue(conn
);
3523 atomic_set(&conn
->check_immediate_queue
, 0);
3526 kmem_cache_free(lio_qr_cache
, qr
);
3528 spin_lock_bh(&cmd
->istate_lock
);
3530 case ISTATE_SEND_R2T
:
3531 spin_unlock_bh(&cmd
->istate_lock
);
3532 ret
= iscsit_send_r2t(cmd
, conn
);
3535 spin_unlock_bh(&cmd
->istate_lock
);
3537 if (cmd
->data_direction
== DMA_TO_DEVICE
)
3538 iscsit_stop_dataout_timer(cmd
);
3540 spin_lock_bh(&conn
->cmd_lock
);
3541 list_del(&cmd
->i_list
);
3542 spin_unlock_bh(&conn
->cmd_lock
);
3544 iscsit_free_cmd(cmd
);
3546 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3547 spin_unlock_bh(&cmd
->istate_lock
);
3548 iscsit_mod_nopin_response_timer(conn
);
3549 ret
= iscsit_send_unsolicited_nopin(cmd
,
3552 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3553 spin_unlock_bh(&cmd
->istate_lock
);
3554 ret
= iscsit_send_unsolicited_nopin(cmd
,
3558 pr_err("Unknown Opcode: 0x%02x ITT:"
3559 " 0x%08x, i_state: %d on CID: %hu\n",
3560 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3562 spin_unlock_bh(&cmd
->istate_lock
);
3566 conn
->tx_immediate_queue
= 0;
3570 if (iscsit_send_tx_data(cmd
, conn
, 1) < 0) {
3571 conn
->tx_immediate_queue
= 0;
3572 iscsit_tx_thread_wait_for_tcp(conn
);
3576 spin_lock_bh(&cmd
->istate_lock
);
3578 case ISTATE_SEND_R2T
:
3579 spin_unlock_bh(&cmd
->istate_lock
);
3580 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3581 iscsit_start_dataout_timer(cmd
, conn
);
3582 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3584 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3585 cmd
->i_state
= ISTATE_SENT_NOPIN_WANT_RESPONSE
;
3586 spin_unlock_bh(&cmd
->istate_lock
);
3588 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3589 cmd
->i_state
= ISTATE_SENT_STATUS
;
3590 spin_unlock_bh(&cmd
->istate_lock
);
3593 pr_err("Unknown Opcode: 0x%02x ITT:"
3594 " 0x%08x, i_state: %d on CID: %hu\n",
3595 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3597 spin_unlock_bh(&cmd
->istate_lock
);
3602 conn
->tx_immediate_queue
= 0;
3605 qr
= iscsit_get_cmd_from_response_queue(conn
);
3609 kmem_cache_free(lio_qr_cache
, qr
);
3611 spin_lock_bh(&cmd
->istate_lock
);
3614 case ISTATE_SEND_DATAIN
:
3615 spin_unlock_bh(&cmd
->istate_lock
);
3616 ret
= iscsit_send_data_in(cmd
, conn
,
3620 case ISTATE_SEND_STATUS
:
3621 case ISTATE_SEND_STATUS_RECOVERY
:
3622 spin_unlock_bh(&cmd
->istate_lock
);
3624 ret
= iscsit_send_status(cmd
, conn
);
3626 case ISTATE_SEND_LOGOUTRSP
:
3627 spin_unlock_bh(&cmd
->istate_lock
);
3629 ret
= iscsit_send_logout_response(cmd
, conn
);
3631 case ISTATE_SEND_ASYNCMSG
:
3632 spin_unlock_bh(&cmd
->istate_lock
);
3634 ret
= iscsit_send_conn_drop_async_message(
3637 case ISTATE_SEND_NOPIN
:
3638 spin_unlock_bh(&cmd
->istate_lock
);
3640 ret
= iscsit_send_nopin_response(cmd
, conn
);
3642 case ISTATE_SEND_REJECT
:
3643 spin_unlock_bh(&cmd
->istate_lock
);
3645 ret
= iscsit_send_reject(cmd
, conn
);
3647 case ISTATE_SEND_TASKMGTRSP
:
3648 spin_unlock_bh(&cmd
->istate_lock
);
3650 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3653 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3655 iscsit_fall_back_to_erl0(conn
->sess
);
3657 case ISTATE_SEND_TEXTRSP
:
3658 spin_unlock_bh(&cmd
->istate_lock
);
3660 ret
= iscsit_send_text_rsp(cmd
, conn
);
3663 pr_err("Unknown Opcode: 0x%02x ITT:"
3664 " 0x%08x, i_state: %d on CID: %hu\n",
3665 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3667 spin_unlock_bh(&cmd
->istate_lock
);
3671 conn
->tx_response_queue
= 0;
3675 se_cmd
= &cmd
->se_cmd
;
3677 if (map_sg
&& !conn
->conn_ops
->IFMarker
) {
3678 if (iscsit_fe_sendpage_sg(cmd
, conn
) < 0) {
3679 conn
->tx_response_queue
= 0;
3680 iscsit_tx_thread_wait_for_tcp(conn
);
3681 iscsit_unmap_iovec(cmd
);
3685 if (iscsit_send_tx_data(cmd
, conn
, use_misc
) < 0) {
3686 conn
->tx_response_queue
= 0;
3687 iscsit_tx_thread_wait_for_tcp(conn
);
3688 iscsit_unmap_iovec(cmd
);
3693 iscsit_unmap_iovec(cmd
);
3695 spin_lock_bh(&cmd
->istate_lock
);
3697 case ISTATE_SEND_DATAIN
:
3699 goto check_rsp_state
;
3702 cmd
->i_state
= ISTATE_SENT_LAST_DATAIN
;
3704 eodr
= use_misc
= 0;
3705 } else if (eodr
== 2) {
3706 cmd
->i_state
= state
=
3709 eodr
= use_misc
= 0;
3710 goto check_rsp_state
;
3713 case ISTATE_SEND_STATUS
:
3717 case ISTATE_SEND_ASYNCMSG
:
3718 case ISTATE_SEND_NOPIN
:
3719 case ISTATE_SEND_STATUS_RECOVERY
:
3720 case ISTATE_SEND_TEXTRSP
:
3724 case ISTATE_SEND_REJECT
:
3726 if (cmd
->cmd_flags
& ICF_REJECT_FAIL_CONN
) {
3727 cmd
->cmd_flags
&= ~ICF_REJECT_FAIL_CONN
;
3728 spin_unlock_bh(&cmd
->istate_lock
);
3729 complete(&cmd
->reject_comp
);
3732 complete(&cmd
->reject_comp
);
3734 case ISTATE_SEND_TASKMGTRSP
:
3738 case ISTATE_SEND_LOGOUTRSP
:
3739 spin_unlock_bh(&cmd
->istate_lock
);
3740 if (!iscsit_logout_post_handler(cmd
, conn
))
3742 spin_lock_bh(&cmd
->istate_lock
);
3747 pr_err("Unknown Opcode: 0x%02x ITT:"
3748 " 0x%08x, i_state: %d on CID: %hu\n",
3749 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3750 cmd
->i_state
, conn
->cid
);
3751 spin_unlock_bh(&cmd
->istate_lock
);
3756 cmd
->i_state
= ISTATE_SENT_STATUS
;
3759 spin_unlock_bh(&cmd
->istate_lock
);
3761 if (atomic_read(&conn
->check_immediate_queue
))
3766 conn
->tx_response_queue
= 0;
3770 iscsit_take_action_for_connection_exit(conn
);
3776 int iscsi_target_rx_thread(void *arg
)
3779 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3780 u32 checksum
= 0, digest
= 0;
3781 struct iscsi_conn
*conn
= NULL
;
3782 struct iscsi_thread_set
*ts
= (struct iscsi_thread_set
*)arg
;
3785 * Allow ourselves to be interrupted by SIGINT so that a
3786 * connection recovery / failure event can be triggered externally.
3788 allow_signal(SIGINT
);
3791 conn
= iscsi_rx_thread_pre_handler(ts
);
3795 while (!kthread_should_stop()) {
3797 * Ensure that both TX and RX per connection kthreads
3798 * are scheduled to run on the same CPU.
3800 iscsit_thread_check_cpumask(conn
, current
, 0);
3802 memset(buffer
, 0, ISCSI_HDR_LEN
);
3803 memset(&iov
, 0, sizeof(struct kvec
));
3805 iov
.iov_base
= buffer
;
3806 iov
.iov_len
= ISCSI_HDR_LEN
;
3808 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3809 if (ret
!= ISCSI_HDR_LEN
) {
3810 iscsit_rx_thread_wait_for_tcp(conn
);
3815 * Set conn->bad_hdr for use with REJECT PDUs.
3817 memcpy(&conn
->bad_hdr
, &buffer
, ISCSI_HDR_LEN
);
3819 if (conn
->conn_ops
->HeaderDigest
) {
3820 iov
.iov_base
= &digest
;
3821 iov
.iov_len
= ISCSI_CRC_LEN
;
3823 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3824 if (ret
!= ISCSI_CRC_LEN
) {
3825 iscsit_rx_thread_wait_for_tcp(conn
);
3829 iscsit_do_crypto_hash_buf(&conn
->conn_rx_hash
,
3830 buffer
, ISCSI_HDR_LEN
,
3831 0, NULL
, (u8
*)&checksum
);
3833 if (digest
!= checksum
) {
3834 pr_err("HeaderDigest CRC32C failed,"
3835 " received 0x%08x, computed 0x%08x\n",
3838 * Set the PDU to 0xff so it will intentionally
3839 * hit default in the switch below.
3841 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3842 spin_lock_bh(&conn
->sess
->session_stats_lock
);
3843 conn
->sess
->conn_digest_errors
++;
3844 spin_unlock_bh(&conn
->sess
->session_stats_lock
);
3846 pr_debug("Got HeaderDigest CRC32C"
3847 " 0x%08x\n", checksum
);
3851 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
3854 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
3856 if (conn
->sess
->sess_ops
->SessionType
&&
3857 ((!(opcode
& ISCSI_OP_TEXT
)) ||
3858 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
3859 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3860 " while in Discovery Session, rejecting.\n", opcode
);
3861 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR
, 1,
3867 case ISCSI_OP_SCSI_CMD
:
3868 if (iscsit_handle_scsi_cmd(conn
, buffer
) < 0)
3871 case ISCSI_OP_SCSI_DATA_OUT
:
3872 if (iscsit_handle_data_out(conn
, buffer
) < 0)
3875 case ISCSI_OP_NOOP_OUT
:
3876 if (iscsit_handle_nop_out(conn
, buffer
) < 0)
3879 case ISCSI_OP_SCSI_TMFUNC
:
3880 if (iscsit_handle_task_mgt_cmd(conn
, buffer
) < 0)
3884 if (iscsit_handle_text_cmd(conn
, buffer
) < 0)
3887 case ISCSI_OP_LOGOUT
:
3888 ret
= iscsit_handle_logout_cmd(conn
, buffer
);
3890 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3891 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3896 case ISCSI_OP_SNACK
:
3897 if (iscsit_handle_snack(conn
, buffer
) < 0)
3901 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3903 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3904 pr_err("Cannot recover from unknown"
3905 " opcode while ERL=0, closing iSCSI connection"
3909 if (!conn
->conn_ops
->OFMarker
) {
3910 pr_err("Unable to recover from unknown"
3911 " opcode while OFMarker=No, closing iSCSI"
3915 if (iscsit_recover_from_unknown_opcode(conn
) < 0) {
3916 pr_err("Unable to recover from unknown"
3917 " opcode, closing iSCSI connection.\n");
3925 if (!signal_pending(current
))
3926 atomic_set(&conn
->transport_failed
, 1);
3927 iscsit_take_action_for_connection_exit(conn
);
3933 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
3935 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
3936 struct iscsi_session
*sess
= conn
->sess
;
3938 * We expect this function to only ever be called from either RX or TX
3939 * thread context via iscsit_close_connection() once the other context
3940 * has been reset -> returned sleeping pre-handler state.
3942 spin_lock_bh(&conn
->cmd_lock
);
3943 list_for_each_entry_safe(cmd
, cmd_tmp
, &conn
->conn_cmd_list
, i_list
) {
3945 list_del(&cmd
->i_list
);
3946 spin_unlock_bh(&conn
->cmd_lock
);
3948 iscsit_increment_maxcmdsn(cmd
, sess
);
3950 iscsit_free_cmd(cmd
);
3952 spin_lock_bh(&conn
->cmd_lock
);
3954 spin_unlock_bh(&conn
->cmd_lock
);
3957 static void iscsit_stop_timers_for_cmds(
3958 struct iscsi_conn
*conn
)
3960 struct iscsi_cmd
*cmd
;
3962 spin_lock_bh(&conn
->cmd_lock
);
3963 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_list
) {
3964 if (cmd
->data_direction
== DMA_TO_DEVICE
)
3965 iscsit_stop_dataout_timer(cmd
);
3967 spin_unlock_bh(&conn
->cmd_lock
);
3970 int iscsit_close_connection(
3971 struct iscsi_conn
*conn
)
3973 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
3974 struct iscsi_session
*sess
= conn
->sess
;
3976 pr_debug("Closing iSCSI connection CID %hu on SID:"
3977 " %u\n", conn
->cid
, sess
->sid
);
3979 * Always up conn_logout_comp just in case the RX Thread is sleeping
3980 * and the logout response never got sent because the connection
3983 complete(&conn
->conn_logout_comp
);
3985 iscsi_release_thread_set(conn
);
3987 iscsit_stop_timers_for_cmds(conn
);
3988 iscsit_stop_nopin_response_timer(conn
);
3989 iscsit_stop_nopin_timer(conn
);
3990 iscsit_free_queue_reqs_for_conn(conn
);
3993 * During Connection recovery drop unacknowledged out of order
3994 * commands for this connection, and prepare the other commands
3997 * During normal operation clear the out of order commands (but
3998 * do not free the struct iscsi_ooo_cmdsn's) and release all
3999 * struct iscsi_cmds.
4001 if (atomic_read(&conn
->connection_recovery
)) {
4002 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4003 iscsit_prepare_cmds_for_realligance(conn
);
4005 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4006 iscsit_release_commands_from_conn(conn
);
4010 * Handle decrementing session or connection usage count if
4011 * a logout response was not able to be sent because the
4012 * connection failed. Fall back to Session Recovery here.
4014 if (atomic_read(&conn
->conn_logout_remove
)) {
4015 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4016 iscsit_dec_conn_usage_count(conn
);
4017 iscsit_dec_session_usage_count(sess
);
4019 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4020 iscsit_dec_conn_usage_count(conn
);
4022 atomic_set(&conn
->conn_logout_remove
, 0);
4023 atomic_set(&sess
->session_reinstatement
, 0);
4024 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4027 spin_lock_bh(&sess
->conn_lock
);
4028 list_del(&conn
->conn_list
);
4031 * Attempt to let the Initiator know this connection failed by
4032 * sending an Connection Dropped Async Message on another
4033 * active connection.
4035 if (atomic_read(&conn
->connection_recovery
))
4036 iscsit_build_conn_drop_async_message(conn
);
4038 spin_unlock_bh(&sess
->conn_lock
);
4041 * If connection reinstatement is being performed on this connection,
4042 * up the connection reinstatement semaphore that is being blocked on
4043 * in iscsit_cause_connection_reinstatement().
4045 spin_lock_bh(&conn
->state_lock
);
4046 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4047 spin_unlock_bh(&conn
->state_lock
);
4048 complete(&conn
->conn_wait_comp
);
4049 wait_for_completion(&conn
->conn_post_wait_comp
);
4050 spin_lock_bh(&conn
->state_lock
);
4054 * If connection reinstatement is being performed on this connection
4055 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4056 * connection wait rcfr semaphore that is being blocked on
4057 * an iscsit_connection_reinstatement_rcfr().
4059 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4060 spin_unlock_bh(&conn
->state_lock
);
4061 complete(&conn
->conn_wait_rcfr_comp
);
4062 wait_for_completion(&conn
->conn_post_wait_comp
);
4063 spin_lock_bh(&conn
->state_lock
);
4065 atomic_set(&conn
->connection_reinstatement
, 1);
4066 spin_unlock_bh(&conn
->state_lock
);
4069 * If any other processes are accessing this connection pointer we
4070 * must wait until they have completed.
4072 iscsit_check_conn_usage_count(conn
);
4074 if (conn
->conn_rx_hash
.tfm
)
4075 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
4076 if (conn
->conn_tx_hash
.tfm
)
4077 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
4079 if (conn
->conn_cpumask
)
4080 free_cpumask_var(conn
->conn_cpumask
);
4082 kfree(conn
->conn_ops
);
4083 conn
->conn_ops
= NULL
;
4086 if (conn
->conn_flags
& CONNFLAG_SCTP_STRUCT_FILE
) {
4087 kfree(conn
->sock
->file
);
4088 conn
->sock
->file
= NULL
;
4090 sock_release(conn
->sock
);
4092 conn
->thread_set
= NULL
;
4094 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4095 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4098 spin_lock_bh(&sess
->conn_lock
);
4099 atomic_dec(&sess
->nconn
);
4100 pr_debug("Decremented iSCSI connection count to %hu from node:"
4101 " %s\n", atomic_read(&sess
->nconn
),
4102 sess
->sess_ops
->InitiatorName
);
4104 * Make sure that if one connection fails in an non ERL=2 iSCSI
4105 * Session that they all fail.
4107 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4108 !atomic_read(&sess
->session_logout
))
4109 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4112 * If this was not the last connection in the session, and we are
4113 * performing session reinstatement or falling back to ERL=0, call
4114 * iscsit_stop_session() without sleeping to shutdown the other
4115 * active connections.
4117 if (atomic_read(&sess
->nconn
)) {
4118 if (!atomic_read(&sess
->session_reinstatement
) &&
4119 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4120 spin_unlock_bh(&sess
->conn_lock
);
4123 if (!atomic_read(&sess
->session_stop_active
)) {
4124 atomic_set(&sess
->session_stop_active
, 1);
4125 spin_unlock_bh(&sess
->conn_lock
);
4126 iscsit_stop_session(sess
, 0, 0);
4129 spin_unlock_bh(&sess
->conn_lock
);
4134 * If this was the last connection in the session and one of the
4135 * following is occurring:
4137 * Session Reinstatement is not being performed, and are falling back
4138 * to ERL=0 call iscsit_close_session().
4140 * Session Logout was requested. iscsit_close_session() will be called
4143 * Session Continuation is not being performed, start the Time2Retain
4144 * handler and check if sleep_on_sess_wait_sem is active.
4146 if (!atomic_read(&sess
->session_reinstatement
) &&
4147 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4148 spin_unlock_bh(&sess
->conn_lock
);
4149 iscsit_close_session(sess
);
4152 } else if (atomic_read(&sess
->session_logout
)) {
4153 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4154 sess
->session_state
= TARG_SESS_STATE_FREE
;
4155 spin_unlock_bh(&sess
->conn_lock
);
4157 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4158 complete(&sess
->session_wait_comp
);
4162 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4163 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4165 if (!atomic_read(&sess
->session_continuation
)) {
4166 spin_unlock_bh(&sess
->conn_lock
);
4167 iscsit_start_time2retain_handler(sess
);
4169 spin_unlock_bh(&sess
->conn_lock
);
4171 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4172 complete(&sess
->session_wait_comp
);
4176 spin_unlock_bh(&sess
->conn_lock
);
4181 int iscsit_close_session(struct iscsi_session
*sess
)
4183 struct iscsi_portal_group
*tpg
= ISCSI_TPG_S(sess
);
4184 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4186 if (atomic_read(&sess
->nconn
)) {
4187 pr_err("%d connection(s) still exist for iSCSI session"
4188 " to %s\n", atomic_read(&sess
->nconn
),
4189 sess
->sess_ops
->InitiatorName
);
4193 spin_lock_bh(&se_tpg
->session_lock
);
4194 atomic_set(&sess
->session_logout
, 1);
4195 atomic_set(&sess
->session_reinstatement
, 1);
4196 iscsit_stop_time2retain_timer(sess
);
4197 spin_unlock_bh(&se_tpg
->session_lock
);
4200 * transport_deregister_session_configfs() will clear the
4201 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4202 * can be setting it again with __transport_register_session() in
4203 * iscsi_post_login_handler() again after the iscsit_stop_session()
4204 * completes in iscsi_np context.
4206 transport_deregister_session_configfs(sess
->se_sess
);
4209 * If any other processes are accessing this session pointer we must
4210 * wait until they have completed. If we are in an interrupt (the
4211 * time2retain handler) and contain and active session usage count we
4212 * restart the timer and exit.
4214 if (!in_interrupt()) {
4215 if (iscsit_check_session_usage_count(sess
) == 1)
4216 iscsit_stop_session(sess
, 1, 1);
4218 if (iscsit_check_session_usage_count(sess
) == 2) {
4219 atomic_set(&sess
->session_logout
, 0);
4220 iscsit_start_time2retain_handler(sess
);
4225 transport_deregister_session(sess
->se_sess
);
4227 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4228 iscsit_free_connection_recovery_entires(sess
);
4230 iscsit_free_all_ooo_cmdsns(sess
);
4232 spin_lock_bh(&se_tpg
->session_lock
);
4233 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4234 sess
->session_state
= TARG_SESS_STATE_FREE
;
4235 pr_debug("Released iSCSI session from node: %s\n",
4236 sess
->sess_ops
->InitiatorName
);
4239 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4241 pr_debug("Decremented number of active iSCSI Sessions on"
4242 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4244 spin_lock(&sess_idr_lock
);
4245 idr_remove(&sess_idr
, sess
->session_index
);
4246 spin_unlock(&sess_idr_lock
);
4248 kfree(sess
->sess_ops
);
4249 sess
->sess_ops
= NULL
;
4250 spin_unlock_bh(&se_tpg
->session_lock
);
4256 static void iscsit_logout_post_handler_closesession(
4257 struct iscsi_conn
*conn
)
4259 struct iscsi_session
*sess
= conn
->sess
;
4261 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4262 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4264 atomic_set(&conn
->conn_logout_remove
, 0);
4265 complete(&conn
->conn_logout_comp
);
4267 iscsit_dec_conn_usage_count(conn
);
4268 iscsit_stop_session(sess
, 1, 1);
4269 iscsit_dec_session_usage_count(sess
);
4270 iscsit_close_session(sess
);
4273 static void iscsit_logout_post_handler_samecid(
4274 struct iscsi_conn
*conn
)
4276 iscsi_set_thread_clear(conn
, ISCSI_CLEAR_TX_THREAD
);
4277 iscsi_set_thread_set_signal(conn
, ISCSI_SIGNAL_TX_THREAD
);
4279 atomic_set(&conn
->conn_logout_remove
, 0);
4280 complete(&conn
->conn_logout_comp
);
4282 iscsit_cause_connection_reinstatement(conn
, 1);
4283 iscsit_dec_conn_usage_count(conn
);
4286 static void iscsit_logout_post_handler_diffcid(
4287 struct iscsi_conn
*conn
,
4290 struct iscsi_conn
*l_conn
;
4291 struct iscsi_session
*sess
= conn
->sess
;
4296 spin_lock_bh(&sess
->conn_lock
);
4297 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4298 if (l_conn
->cid
== cid
) {
4299 iscsit_inc_conn_usage_count(l_conn
);
4303 spin_unlock_bh(&sess
->conn_lock
);
4309 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4311 spin_lock_bh(&l_conn
->state_lock
);
4312 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4313 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4314 spin_unlock_bh(&l_conn
->state_lock
);
4316 iscsit_cause_connection_reinstatement(l_conn
, 1);
4317 iscsit_dec_conn_usage_count(l_conn
);
4321 * Return of 0 causes the TX thread to restart.
4323 static int iscsit_logout_post_handler(
4324 struct iscsi_cmd
*cmd
,
4325 struct iscsi_conn
*conn
)
4329 switch (cmd
->logout_reason
) {
4330 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4331 switch (cmd
->logout_response
) {
4332 case ISCSI_LOGOUT_SUCCESS
:
4333 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4335 iscsit_logout_post_handler_closesession(conn
);
4340 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4341 if (conn
->cid
== cmd
->logout_cid
) {
4342 switch (cmd
->logout_response
) {
4343 case ISCSI_LOGOUT_SUCCESS
:
4344 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4346 iscsit_logout_post_handler_samecid(conn
);
4351 switch (cmd
->logout_response
) {
4352 case ISCSI_LOGOUT_SUCCESS
:
4353 iscsit_logout_post_handler_diffcid(conn
,
4356 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4357 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4364 case ISCSI_LOGOUT_REASON_RECOVERY
:
4365 switch (cmd
->logout_response
) {
4366 case ISCSI_LOGOUT_SUCCESS
:
4367 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4368 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4369 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4382 void iscsit_fail_session(struct iscsi_session
*sess
)
4384 struct iscsi_conn
*conn
;
4386 spin_lock_bh(&sess
->conn_lock
);
4387 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4388 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4389 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4391 spin_unlock_bh(&sess
->conn_lock
);
4393 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4394 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4397 int iscsit_free_session(struct iscsi_session
*sess
)
4399 u16 conn_count
= atomic_read(&sess
->nconn
);
4400 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4403 spin_lock_bh(&sess
->conn_lock
);
4404 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4406 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4408 if (conn_count
== 0)
4411 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4414 iscsit_inc_conn_usage_count(conn_tmp
);
4417 iscsit_inc_conn_usage_count(conn
);
4419 spin_unlock_bh(&sess
->conn_lock
);
4420 iscsit_cause_connection_reinstatement(conn
, 1);
4421 spin_lock_bh(&sess
->conn_lock
);
4423 iscsit_dec_conn_usage_count(conn
);
4425 iscsit_dec_conn_usage_count(conn_tmp
);
4430 if (atomic_read(&sess
->nconn
)) {
4431 spin_unlock_bh(&sess
->conn_lock
);
4432 wait_for_completion(&sess
->session_wait_comp
);
4434 spin_unlock_bh(&sess
->conn_lock
);
4436 iscsit_close_session(sess
);
4440 void iscsit_stop_session(
4441 struct iscsi_session
*sess
,
4443 int connection_sleep
)
4445 u16 conn_count
= atomic_read(&sess
->nconn
);
4446 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4449 spin_lock_bh(&sess
->conn_lock
);
4451 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4453 if (connection_sleep
) {
4454 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4456 if (conn_count
== 0)
4459 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4462 iscsit_inc_conn_usage_count(conn_tmp
);
4465 iscsit_inc_conn_usage_count(conn
);
4467 spin_unlock_bh(&sess
->conn_lock
);
4468 iscsit_cause_connection_reinstatement(conn
, 1);
4469 spin_lock_bh(&sess
->conn_lock
);
4471 iscsit_dec_conn_usage_count(conn
);
4473 iscsit_dec_conn_usage_count(conn_tmp
);
4477 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4478 iscsit_cause_connection_reinstatement(conn
, 0);
4481 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4482 spin_unlock_bh(&sess
->conn_lock
);
4483 wait_for_completion(&sess
->session_wait_comp
);
4485 spin_unlock_bh(&sess
->conn_lock
);
4488 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4490 struct iscsi_session
*sess
;
4491 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4492 struct se_session
*se_sess
, *se_sess_tmp
;
4493 int session_count
= 0;
4495 spin_lock_bh(&se_tpg
->session_lock
);
4496 if (tpg
->nsessions
&& !force
) {
4497 spin_unlock_bh(&se_tpg
->session_lock
);
4501 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4503 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4505 spin_lock(&sess
->conn_lock
);
4506 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4507 atomic_read(&sess
->session_logout
) ||
4508 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4509 spin_unlock(&sess
->conn_lock
);
4512 atomic_set(&sess
->session_reinstatement
, 1);
4513 spin_unlock(&sess
->conn_lock
);
4514 spin_unlock_bh(&se_tpg
->session_lock
);
4516 iscsit_free_session(sess
);
4517 spin_lock_bh(&se_tpg
->session_lock
);
4521 spin_unlock_bh(&se_tpg
->session_lock
);
4523 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4524 " Group: %hu\n", session_count
, tpg
->tpgt
);
4528 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4529 MODULE_VERSION("4.1.x");
4530 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4531 MODULE_LICENSE("GPL");
4533 module_init(iscsi_target_init_module
);
4534 module_exit(iscsi_target_cleanup_module
);