1 /*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
19 #include <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.h>
22 #include <linux/completion.h>
23 #include <linux/module.h>
24 #include <linux/vmalloc.h>
25 #include <linux/idr.h>
26 #include <linux/delay.h>
27 #include <linux/sched/signal.h>
28 #include <asm/unaligned.h>
30 #include <scsi/scsi_proto.h>
31 #include <scsi/iscsi_proto.h>
32 #include <scsi/scsi_tcq.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_fabric.h>
36 #include <target/iscsi/iscsi_target_core.h>
37 #include "iscsi_target_parameters.h"
38 #include "iscsi_target_seq_pdu_list.h"
39 #include "iscsi_target_datain_values.h"
40 #include "iscsi_target_erl0.h"
41 #include "iscsi_target_erl1.h"
42 #include "iscsi_target_erl2.h"
43 #include "iscsi_target_login.h"
44 #include "iscsi_target_tmr.h"
45 #include "iscsi_target_tpg.h"
46 #include "iscsi_target_util.h"
47 #include "iscsi_target.h"
48 #include "iscsi_target_device.h"
49 #include <target/iscsi/iscsi_target_stat.h>
51 #include <target/iscsi/iscsi_transport.h>
53 static LIST_HEAD(g_tiqn_list
);
54 static LIST_HEAD(g_np_list
);
55 static DEFINE_SPINLOCK(tiqn_lock
);
56 static DEFINE_MUTEX(np_lock
);
58 static struct idr tiqn_idr
;
60 struct mutex auth_id_lock
;
61 spinlock_t sess_idr_lock
;
63 struct iscsit_global
*iscsit_global
;
65 struct kmem_cache
*lio_qr_cache
;
66 struct kmem_cache
*lio_dr_cache
;
67 struct kmem_cache
*lio_ooo_cache
;
68 struct kmem_cache
*lio_r2t_cache
;
70 static int iscsit_handle_immediate_data(struct iscsi_cmd
*,
71 struct iscsi_scsi_req
*, u32
);
73 struct iscsi_tiqn
*iscsit_get_tiqn_for_login(unsigned char *buf
)
75 struct iscsi_tiqn
*tiqn
= NULL
;
77 spin_lock(&tiqn_lock
);
78 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
79 if (!strcmp(tiqn
->tiqn
, buf
)) {
81 spin_lock(&tiqn
->tiqn_state_lock
);
82 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
83 tiqn
->tiqn_access_count
++;
84 spin_unlock(&tiqn
->tiqn_state_lock
);
85 spin_unlock(&tiqn_lock
);
88 spin_unlock(&tiqn
->tiqn_state_lock
);
91 spin_unlock(&tiqn_lock
);
96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn
*tiqn
)
98 spin_lock(&tiqn
->tiqn_state_lock
);
99 if (tiqn
->tiqn_state
== TIQN_STATE_ACTIVE
) {
100 tiqn
->tiqn_state
= TIQN_STATE_SHUTDOWN
;
101 spin_unlock(&tiqn
->tiqn_state_lock
);
104 spin_unlock(&tiqn
->tiqn_state_lock
);
109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn
*tiqn
)
111 spin_lock(&tiqn
->tiqn_state_lock
);
112 tiqn
->tiqn_access_count
--;
113 spin_unlock(&tiqn
->tiqn_state_lock
);
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
120 struct iscsi_tiqn
*iscsit_add_tiqn(unsigned char *buf
)
122 struct iscsi_tiqn
*tiqn
= NULL
;
125 if (strlen(buf
) >= ISCSI_IQN_LEN
) {
126 pr_err("Target IQN exceeds %d bytes\n",
128 return ERR_PTR(-EINVAL
);
131 tiqn
= kzalloc(sizeof(*tiqn
), GFP_KERNEL
);
133 return ERR_PTR(-ENOMEM
);
135 sprintf(tiqn
->tiqn
, "%s", buf
);
136 INIT_LIST_HEAD(&tiqn
->tiqn_list
);
137 INIT_LIST_HEAD(&tiqn
->tiqn_tpg_list
);
138 spin_lock_init(&tiqn
->tiqn_state_lock
);
139 spin_lock_init(&tiqn
->tiqn_tpg_lock
);
140 spin_lock_init(&tiqn
->sess_err_stats
.lock
);
141 spin_lock_init(&tiqn
->login_stats
.lock
);
142 spin_lock_init(&tiqn
->logout_stats
.lock
);
144 tiqn
->tiqn_state
= TIQN_STATE_ACTIVE
;
146 idr_preload(GFP_KERNEL
);
147 spin_lock(&tiqn_lock
);
149 ret
= idr_alloc(&tiqn_idr
, NULL
, 0, 0, GFP_NOWAIT
);
151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
152 spin_unlock(&tiqn_lock
);
157 tiqn
->tiqn_index
= ret
;
158 list_add_tail(&tiqn
->tiqn_list
, &g_tiqn_list
);
160 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 spin_unlock_bh(&np
->np_thread_lock
);
221 * Determine if the portal group is accepting storage traffic.
223 spin_lock_bh(&tpg
->tpg_state_lock
);
224 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
225 spin_unlock_bh(&tpg
->tpg_state_lock
);
228 spin_unlock_bh(&tpg
->tpg_state_lock
);
231 * Here we serialize access across the TIQN+TPG Tuple.
233 ret
= down_interruptible(&tpg
->np_login_sem
);
237 spin_lock_bh(&tpg
->tpg_state_lock
);
238 if (tpg
->tpg_state
!= TPG_STATE_ACTIVE
) {
239 spin_unlock_bh(&tpg
->tpg_state_lock
);
240 up(&tpg
->np_login_sem
);
243 spin_unlock_bh(&tpg
->tpg_state_lock
);
248 void iscsit_login_kref_put(struct kref
*kref
)
250 struct iscsi_tpg_np
*tpg_np
= container_of(kref
,
251 struct iscsi_tpg_np
, tpg_np_kref
);
253 complete(&tpg_np
->tpg_np_comp
);
256 int iscsit_deaccess_np(struct iscsi_np
*np
, struct iscsi_portal_group
*tpg
,
257 struct iscsi_tpg_np
*tpg_np
)
259 struct iscsi_tiqn
*tiqn
= tpg
->tpg_tiqn
;
261 up(&tpg
->np_login_sem
);
264 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
267 iscsit_put_tiqn_for_login(tiqn
);
272 bool iscsit_check_np_match(
273 struct sockaddr_storage
*sockaddr
,
275 int network_transport
)
277 struct sockaddr_in
*sock_in
, *sock_in_e
;
278 struct sockaddr_in6
*sock_in6
, *sock_in6_e
;
279 bool ip_match
= false;
282 if (sockaddr
->ss_family
== AF_INET6
) {
283 sock_in6
= (struct sockaddr_in6
*)sockaddr
;
284 sock_in6_e
= (struct sockaddr_in6
*)&np
->np_sockaddr
;
286 if (!memcmp(&sock_in6
->sin6_addr
.in6_u
,
287 &sock_in6_e
->sin6_addr
.in6_u
,
288 sizeof(struct in6_addr
)))
291 port
= ntohs(sock_in6
->sin6_port
);
292 port_e
= ntohs(sock_in6_e
->sin6_port
);
294 sock_in
= (struct sockaddr_in
*)sockaddr
;
295 sock_in_e
= (struct sockaddr_in
*)&np
->np_sockaddr
;
297 if (sock_in
->sin_addr
.s_addr
== sock_in_e
->sin_addr
.s_addr
)
300 port
= ntohs(sock_in
->sin_port
);
301 port_e
= ntohs(sock_in_e
->sin_port
);
304 if (ip_match
&& (port_e
== port
) &&
305 (np
->np_network_transport
== network_transport
))
312 * Called with mutex np_lock held
314 static struct iscsi_np
*iscsit_get_np(
315 struct sockaddr_storage
*sockaddr
,
316 int network_transport
)
321 list_for_each_entry(np
, &g_np_list
, np_list
) {
322 spin_lock_bh(&np
->np_thread_lock
);
323 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
324 spin_unlock_bh(&np
->np_thread_lock
);
328 match
= iscsit_check_np_match(sockaddr
, np
, network_transport
);
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
336 spin_unlock_bh(&np
->np_thread_lock
);
339 spin_unlock_bh(&np
->np_thread_lock
);
345 struct iscsi_np
*iscsit_add_np(
346 struct sockaddr_storage
*sockaddr
,
347 int network_transport
)
352 mutex_lock(&np_lock
);
355 * Locate the existing struct iscsi_np if already active..
357 np
= iscsit_get_np(sockaddr
, network_transport
);
359 mutex_unlock(&np_lock
);
363 np
= kzalloc(sizeof(*np
), GFP_KERNEL
);
365 mutex_unlock(&np_lock
);
366 return ERR_PTR(-ENOMEM
);
369 np
->np_flags
|= NPF_IP_NETWORK
;
370 np
->np_network_transport
= network_transport
;
371 spin_lock_init(&np
->np_thread_lock
);
372 init_completion(&np
->np_restart_comp
);
373 INIT_LIST_HEAD(&np
->np_list
);
375 ret
= iscsi_target_setup_login_socket(np
, sockaddr
);
378 mutex_unlock(&np_lock
);
382 np
->np_thread
= kthread_run(iscsi_target_login_thread
, np
, "iscsi_np");
383 if (IS_ERR(np
->np_thread
)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret
= PTR_ERR(np
->np_thread
);
387 mutex_unlock(&np_lock
);
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
398 np
->np_thread_state
= ISCSI_NP_THREAD_ACTIVE
;
400 list_add_tail(&np
->np_list
, &g_np_list
);
401 mutex_unlock(&np_lock
);
403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np
->np_sockaddr
, np
->np_transport
->name
);
409 int iscsit_reset_np_thread(
411 struct iscsi_tpg_np
*tpg_np
,
412 struct iscsi_portal_group
*tpg
,
415 spin_lock_bh(&np
->np_thread_lock
);
416 if (np
->np_thread_state
== ISCSI_NP_THREAD_INACTIVE
) {
417 spin_unlock_bh(&np
->np_thread_lock
);
420 np
->np_thread_state
= ISCSI_NP_THREAD_RESET
;
423 spin_unlock_bh(&np
->np_thread_lock
);
424 send_sig(SIGINT
, np
->np_thread
, 1);
425 wait_for_completion(&np
->np_restart_comp
);
426 spin_lock_bh(&np
->np_thread_lock
);
428 spin_unlock_bh(&np
->np_thread_lock
);
430 if (tpg_np
&& shutdown
) {
431 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
433 wait_for_completion(&tpg_np
->tpg_np_comp
);
439 static void iscsit_free_np(struct iscsi_np
*np
)
442 sock_release(np
->np_socket
);
445 int iscsit_del_np(struct iscsi_np
*np
)
447 spin_lock_bh(&np
->np_thread_lock
);
449 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
);
464 np
->np_thread
= NULL
;
467 np
->np_transport
->iscsit_free_np(np
);
469 mutex_lock(&np_lock
);
470 list_del(&np
->np_list
);
471 mutex_unlock(&np_lock
);
473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np
->np_sockaddr
, np
->np_transport
->name
);
476 iscsit_put_transport(np
->np_transport
);
481 static void iscsit_get_rx_pdu(struct iscsi_conn
*);
483 int iscsit_queue_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
485 return iscsit_add_cmd_to_response_queue(cmd
, cmd
->conn
, cmd
->i_state
);
487 EXPORT_SYMBOL(iscsit_queue_rsp
);
489 void iscsit_aborted_task(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
491 bool scsi_cmd
= (cmd
->iscsi_opcode
== ISCSI_OP_SCSI_CMD
);
493 spin_lock_bh(&conn
->cmd_lock
);
494 if (!list_empty(&cmd
->i_conn_node
) &&
495 !(cmd
->se_cmd
.transport_state
& CMD_T_FABRIC_STOP
))
496 list_del_init(&cmd
->i_conn_node
);
497 spin_unlock_bh(&conn
->cmd_lock
);
499 __iscsit_free_cmd(cmd
, scsi_cmd
, true);
501 EXPORT_SYMBOL(iscsit_aborted_task
);
503 static void iscsit_do_crypto_hash_buf(struct ahash_request
*, const void *,
504 u32
, u32
, u8
*, u8
*);
505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*);
508 iscsit_xmit_nondatain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
509 const void *data_buf
, u32 data_buf_len
)
511 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)cmd
->pdu
;
513 u32 niov
= 0, tx_size
= ISCSI_HDR_LEN
;
516 iov
= &cmd
->iov_misc
[0];
517 iov
[niov
].iov_base
= cmd
->pdu
;
518 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
520 if (conn
->conn_ops
->HeaderDigest
) {
521 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
523 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, hdr
,
524 ISCSI_HDR_LEN
, 0, NULL
,
525 (u8
*)header_digest
);
527 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
528 tx_size
+= ISCSI_CRC_LEN
;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr
->opcode
, *header_digest
);
535 u32 padding
= ((-data_buf_len
) & 3);
537 iov
[niov
].iov_base
= (void *)data_buf
;
538 iov
[niov
++].iov_len
= data_buf_len
;
539 tx_size
+= data_buf_len
;
542 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
543 iov
[niov
++].iov_len
= padding
;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding
);
549 if (conn
->conn_ops
->DataDigest
) {
550 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
,
551 data_buf
, data_buf_len
,
553 (u8
*)&cmd
->pad_bytes
,
554 (u8
*)&cmd
->data_crc
);
556 iov
[niov
].iov_base
= &cmd
->data_crc
;
557 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
558 tx_size
+= ISCSI_CRC_LEN
;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len
, hdr
->opcode
, cmd
->data_crc
);
565 cmd
->iov_misc_count
= niov
;
566 cmd
->tx_size
= tx_size
;
568 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
570 iscsit_tx_thread_wait_for_tcp(conn
);
577 static int iscsit_map_iovec(struct iscsi_cmd
*, struct kvec
*, u32
, u32
);
578 static void iscsit_unmap_iovec(struct iscsi_cmd
*);
579 static u32
iscsit_do_crypto_hash_sg(struct ahash_request
*, struct iscsi_cmd
*,
580 u32
, u32
, u32
, u8
*);
582 iscsit_xmit_datain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
583 const struct iscsi_datain
*datain
)
586 u32 iov_count
= 0, tx_size
= 0;
589 iov
= &cmd
->iov_data
[0];
590 iov
[iov_count
].iov_base
= cmd
->pdu
;
591 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
592 tx_size
+= ISCSI_HDR_LEN
;
594 if (conn
->conn_ops
->HeaderDigest
) {
595 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
597 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, cmd
->pdu
,
598 ISCSI_HDR_LEN
, 0, NULL
,
599 (u8
*)header_digest
);
601 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
602 tx_size
+= ISCSI_CRC_LEN
;
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
608 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1],
609 datain
->offset
, datain
->length
);
613 iov_count
+= iov_ret
;
614 tx_size
+= datain
->length
;
616 cmd
->padding
= ((-datain
->length
) & 3);
618 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
619 iov
[iov_count
++].iov_len
= cmd
->padding
;
620 tx_size
+= cmd
->padding
;
622 pr_debug("Attaching %u padding bytes\n", cmd
->padding
);
625 if (conn
->conn_ops
->DataDigest
) {
626 cmd
->data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_tx_hash
,
632 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
633 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
634 tx_size
+= ISCSI_CRC_LEN
;
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain
->length
+ cmd
->padding
, cmd
->data_crc
);
640 cmd
->iov_data_count
= iov_count
;
641 cmd
->tx_size
= tx_size
;
643 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
645 iscsit_unmap_iovec(cmd
);
648 iscsit_tx_thread_wait_for_tcp(conn
);
655 static int iscsit_xmit_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
656 struct iscsi_datain_req
*dr
, const void *buf
,
660 return iscsit_xmit_datain_pdu(conn
, cmd
, buf
);
662 return iscsit_xmit_nondatain_pdu(conn
, cmd
, buf
, buf_len
);
665 static enum target_prot_op
iscsit_get_sup_prot_ops(struct iscsi_conn
*conn
)
667 return TARGET_PROT_NORMAL
;
670 static struct iscsit_transport iscsi_target_transport
= {
672 .transport_type
= ISCSI_TCP
,
673 .rdma_shutdown
= false,
675 .iscsit_setup_np
= iscsit_setup_np
,
676 .iscsit_accept_np
= iscsit_accept_np
,
677 .iscsit_free_np
= iscsit_free_np
,
678 .iscsit_get_login_rx
= iscsit_get_login_rx
,
679 .iscsit_put_login_tx
= iscsit_put_login_tx
,
680 .iscsit_get_dataout
= iscsit_build_r2ts_for_cmd
,
681 .iscsit_immediate_queue
= iscsit_immediate_queue
,
682 .iscsit_response_queue
= iscsit_response_queue
,
683 .iscsit_queue_data_in
= iscsit_queue_rsp
,
684 .iscsit_queue_status
= iscsit_queue_rsp
,
685 .iscsit_aborted_task
= iscsit_aborted_task
,
686 .iscsit_xmit_pdu
= iscsit_xmit_pdu
,
687 .iscsit_get_rx_pdu
= iscsit_get_rx_pdu
,
688 .iscsit_get_sup_prot_ops
= iscsit_get_sup_prot_ops
,
691 static int __init
iscsi_target_init_module(void)
695 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
696 iscsit_global
= kzalloc(sizeof(*iscsit_global
), GFP_KERNEL
);
700 spin_lock_init(&iscsit_global
->ts_bitmap_lock
);
701 mutex_init(&auth_id_lock
);
702 spin_lock_init(&sess_idr_lock
);
706 ret
= target_register_template(&iscsi_ops
);
710 size
= BITS_TO_LONGS(ISCSIT_BITMAP_BITS
) * sizeof(long);
711 iscsit_global
->ts_bitmap
= vzalloc(size
);
712 if (!iscsit_global
->ts_bitmap
)
715 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req
),
717 __alignof__(struct iscsi_queue_req
), 0, NULL
);
719 pr_err("nable to kmem_cache_create() for"
724 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req
),
726 __alignof__(struct iscsi_datain_req
), 0, NULL
);
728 pr_err("Unable to kmem_cache_create() for"
733 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn
),
735 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
736 if (!lio_ooo_cache
) {
737 pr_err("Unable to kmem_cache_create() for"
742 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
745 if (!lio_r2t_cache
) {
746 pr_err("Unable to kmem_cache_create() for"
751 iscsit_register_transport(&iscsi_target_transport
);
753 if (iscsit_load_discovery_tpg() < 0)
758 iscsit_unregister_transport(&iscsi_target_transport
);
759 kmem_cache_destroy(lio_r2t_cache
);
761 kmem_cache_destroy(lio_ooo_cache
);
763 kmem_cache_destroy(lio_dr_cache
);
765 kmem_cache_destroy(lio_qr_cache
);
767 vfree(iscsit_global
->ts_bitmap
);
769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global
->discovery_tpg
)
771 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
772 target_unregister_template(&iscsi_ops
);
774 kfree(iscsit_global
);
778 static void __exit
iscsi_target_cleanup_module(void)
780 iscsit_release_discovery_tpg();
781 iscsit_unregister_transport(&iscsi_target_transport
);
782 kmem_cache_destroy(lio_qr_cache
);
783 kmem_cache_destroy(lio_dr_cache
);
784 kmem_cache_destroy(lio_ooo_cache
);
785 kmem_cache_destroy(lio_r2t_cache
);
788 * Shutdown discovery sessions and disable discovery TPG
790 if (iscsit_global
->discovery_tpg
)
791 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
793 target_unregister_template(&iscsi_ops
);
795 vfree(iscsit_global
->ts_bitmap
);
796 kfree(iscsit_global
);
799 int iscsit_add_reject(
800 struct iscsi_conn
*conn
,
804 struct iscsi_cmd
*cmd
;
806 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
810 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
811 cmd
->reject_reason
= reason
;
813 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
816 iscsit_free_cmd(cmd
, false);
820 spin_lock_bh(&conn
->cmd_lock
);
821 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
822 spin_unlock_bh(&conn
->cmd_lock
);
824 cmd
->i_state
= ISTATE_SEND_REJECT
;
825 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
829 EXPORT_SYMBOL(iscsit_add_reject
);
831 static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd
*cmd
,
837 struct iscsi_conn
*conn
;
840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
846 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
847 cmd
->reject_reason
= reason
;
849 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
851 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
852 iscsit_free_cmd(cmd
, false);
857 spin_lock_bh(&conn
->cmd_lock
);
858 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
859 spin_unlock_bh(&conn
->cmd_lock
);
862 cmd
->i_state
= ISTATE_SEND_REJECT
;
863 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
865 * Perform the kref_put now if se_cmd has already been setup by
866 * scsit_setup_scsi_cmd()
868 if (cmd
->se_cmd
.se_tfo
!= NULL
) {
869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
870 target_put_sess_cmd(&cmd
->se_cmd
);
875 static int iscsit_add_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
,
878 return iscsit_add_reject_from_cmd(cmd
, reason
, true, buf
);
881 int iscsit_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
, unsigned char *buf
)
883 return iscsit_add_reject_from_cmd(cmd
, reason
, false, buf
);
885 EXPORT_SYMBOL(iscsit_reject_cmd
);
888 * Map some portion of the allocated scatterlist to an iovec, suitable for
889 * kernel sockets to copy data in/out.
891 static int iscsit_map_iovec(
892 struct iscsi_cmd
*cmd
,
898 struct scatterlist
*sg
;
899 unsigned int page_off
;
902 * We know each entry in t_data_sg contains a page.
904 u32 ent
= data_offset
/ PAGE_SIZE
;
906 if (ent
>= cmd
->se_cmd
.t_data_nents
) {
907 pr_err("Initial page entry out-of-bounds\n");
911 sg
= &cmd
->se_cmd
.t_data_sg
[ent
];
912 page_off
= (data_offset
% PAGE_SIZE
);
914 cmd
->first_data_sg
= sg
;
915 cmd
->first_data_sg_off
= page_off
;
917 while (data_length
) {
918 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
920 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
921 iov
[i
].iov_len
= cur_len
;
923 data_length
-= cur_len
;
929 cmd
->kmapped_nents
= i
;
934 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
937 struct scatterlist
*sg
;
939 sg
= cmd
->first_data_sg
;
941 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
942 kunmap(sg_page(&sg
[i
]));
945 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
948 struct iscsi_cmd
*cmd
, *cmd_p
;
950 conn
->exp_statsn
= exp_statsn
;
952 if (conn
->sess
->sess_ops
->RDMAExtensions
)
955 spin_lock_bh(&conn
->cmd_lock
);
956 list_for_each_entry_safe(cmd
, cmd_p
, &conn
->conn_cmd_list
, i_conn_node
) {
957 spin_lock(&cmd
->istate_lock
);
958 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
959 iscsi_sna_lt(cmd
->stat_sn
, exp_statsn
)) {
960 cmd
->i_state
= ISTATE_REMOVE
;
961 spin_unlock(&cmd
->istate_lock
);
962 list_move_tail(&cmd
->i_conn_node
, &ack_list
);
965 spin_unlock(&cmd
->istate_lock
);
967 spin_unlock_bh(&conn
->cmd_lock
);
969 list_for_each_entry_safe(cmd
, cmd_p
, &ack_list
, i_conn_node
) {
970 list_del_init(&cmd
->i_conn_node
);
971 iscsit_free_cmd(cmd
, false);
975 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
977 u32 iov_count
= max(1UL, DIV_ROUND_UP(cmd
->se_cmd
.data_length
, PAGE_SIZE
));
979 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
980 cmd
->iov_data
= kcalloc(iov_count
, sizeof(*cmd
->iov_data
), GFP_KERNEL
);
984 cmd
->orig_iov_data_count
= iov_count
;
988 int iscsit_setup_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
991 int data_direction
, payload_length
;
992 struct iscsi_scsi_req
*hdr
;
996 atomic_long_inc(&conn
->sess
->cmd_pdus
);
998 hdr
= (struct iscsi_scsi_req
*) buf
;
999 payload_length
= ntoh24(hdr
->dlength
);
1001 /* FIXME; Add checks for AdditionalHeaderSegment */
1003 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
1004 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1005 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1006 " not set. Bad iSCSI Initiator.\n");
1007 return iscsit_add_reject_cmd(cmd
,
1008 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1011 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
1012 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
1014 * From RFC-3720 Section 10.3.1:
1016 * "Either or both of R and W MAY be 1 when either the
1017 * Expected Data Transfer Length and/or Bidirectional Read
1018 * Expected Data Transfer Length are 0"
1020 * For this case, go ahead and clear the unnecssary bits
1021 * to avoid any confusion with ->data_direction.
1023 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
1024 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
1026 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1027 " set when Expected Data Transfer Length is 0 for"
1028 " CDB: 0x%02x, Fixing up flags\n", hdr
->cdb
[0]);
1031 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1032 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
1033 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1034 " MUST be set if Expected Data Transfer Length is not 0."
1035 " Bad iSCSI Initiator\n");
1036 return iscsit_add_reject_cmd(cmd
,
1037 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1040 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1041 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
1042 pr_err("Bidirectional operations not supported!\n");
1043 return iscsit_add_reject_cmd(cmd
,
1044 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1047 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1048 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1049 " Scsi Command PDU.\n");
1050 return iscsit_add_reject_cmd(cmd
,
1051 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1054 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
1055 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1056 " protocol error.\n", payload_length
);
1057 return iscsit_add_reject_cmd(cmd
,
1058 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1061 if ((be32_to_cpu(hdr
->data_length
) == payload_length
) &&
1062 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
1063 pr_err("Expected Data Transfer Length and Length of"
1064 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1065 " bit is not set protocol error\n");
1066 return iscsit_add_reject_cmd(cmd
,
1067 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1070 if (payload_length
> be32_to_cpu(hdr
->data_length
)) {
1071 pr_err("DataSegmentLength: %u is greater than"
1072 " EDTL: %u, protocol error.\n", payload_length
,
1074 return iscsit_add_reject_cmd(cmd
,
1075 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1078 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1079 pr_err("DataSegmentLength: %u is greater than"
1080 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1081 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1082 return iscsit_add_reject_cmd(cmd
,
1083 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1086 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " FirstBurstLength: %u, protocol error.\n",
1089 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
1090 return iscsit_add_reject_cmd(cmd
,
1091 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1094 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
1095 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
1098 cmd
->data_direction
= data_direction
;
1099 iscsi_task_attr
= hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
;
1101 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103 if ((iscsi_task_attr
== ISCSI_ATTR_UNTAGGED
) ||
1104 (iscsi_task_attr
== ISCSI_ATTR_SIMPLE
))
1105 sam_task_attr
= TCM_SIMPLE_TAG
;
1106 else if (iscsi_task_attr
== ISCSI_ATTR_ORDERED
)
1107 sam_task_attr
= TCM_ORDERED_TAG
;
1108 else if (iscsi_task_attr
== ISCSI_ATTR_HEAD_OF_QUEUE
)
1109 sam_task_attr
= TCM_HEAD_TAG
;
1110 else if (iscsi_task_attr
== ISCSI_ATTR_ACA
)
1111 sam_task_attr
= TCM_ACA_TAG
;
1113 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1114 " TCM_SIMPLE_TAG\n", iscsi_task_attr
);
1115 sam_task_attr
= TCM_SIMPLE_TAG
;
1118 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
1119 cmd
->i_state
= ISTATE_NEW_CMD
;
1120 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1121 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
1122 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
1123 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
1124 if (cmd
->unsolicited_data
)
1125 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
1127 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1128 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
)
1129 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
1131 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1132 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1133 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1134 cmd
->first_burst_len
= payload_length
;
1136 if (!conn
->sess
->sess_ops
->RDMAExtensions
&&
1137 cmd
->data_direction
== DMA_FROM_DEVICE
) {
1138 struct iscsi_datain_req
*dr
;
1140 dr
= iscsit_allocate_datain_req();
1142 return iscsit_add_reject_cmd(cmd
,
1143 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1145 iscsit_attach_datain_req(cmd
, dr
);
1149 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
1152 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
1153 cmd
->data_direction
, sam_task_attr
,
1154 cmd
->sense_buffer
+ 2);
1156 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1157 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
1158 hdr
->cmdsn
, be32_to_cpu(hdr
->data_length
), payload_length
,
1161 target_get_sess_cmd(&cmd
->se_cmd
, true);
1163 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
1164 scsilun_to_int(&hdr
->lun
));
1165 if (cmd
->sense_reason
)
1168 /* only used for printks or comparing with ->ref_task_tag */
1169 cmd
->se_cmd
.tag
= (__force u32
)cmd
->init_task_tag
;
1170 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
1171 if (cmd
->sense_reason
) {
1172 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
1173 return iscsit_add_reject_cmd(cmd
,
1174 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1180 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
1181 return iscsit_add_reject_cmd(cmd
,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1186 spin_lock_bh(&conn
->cmd_lock
);
1187 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1188 spin_unlock_bh(&conn
->cmd_lock
);
1190 * Check if we need to delay processing because of ALUA
1191 * Active/NonOptimized primary access state..
1193 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1197 EXPORT_SYMBOL(iscsit_setup_scsi_cmd
);
1199 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd
*cmd
)
1201 iscsit_set_dataout_sequence_values(cmd
);
1203 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1204 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1205 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1207 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout
);
1209 int iscsit_process_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1210 struct iscsi_scsi_req
*hdr
)
1214 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1215 * the Immediate Bit is not set, and no Immediate
1218 * A PDU/CmdSN carrying Immediate Data can only
1219 * be processed after the DataCRC has passed.
1220 * If the DataCRC fails, the CmdSN MUST NOT
1221 * be acknowledged. (See below)
1223 if (!cmd
->immediate_data
) {
1224 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1225 (unsigned char *)hdr
, hdr
->cmdsn
);
1226 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1228 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1229 target_put_sess_cmd(&cmd
->se_cmd
);
1234 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1237 * If no Immediate Data is attached, it's OK to return now.
1239 if (!cmd
->immediate_data
) {
1240 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
)
1241 iscsit_set_unsoliticed_dataout(cmd
);
1242 if (!cmd
->sense_reason
)
1245 target_put_sess_cmd(&cmd
->se_cmd
);
1250 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1251 * execution. These exceptions are processed in CmdSN order using
1252 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254 if (cmd
->sense_reason
) {
1255 if (cmd
->reject_reason
)
1261 * Call directly into transport_generic_new_cmd() to perform
1262 * the backend memory allocation.
1264 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1265 if (cmd
->sense_reason
)
1270 EXPORT_SYMBOL(iscsit_process_scsi_cmd
);
1273 iscsit_get_immediate_data(struct iscsi_cmd
*cmd
, struct iscsi_scsi_req
*hdr
,
1276 int cmdsn_ret
= 0, immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1278 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1281 goto after_immediate_data
;
1283 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1284 cmd
->first_burst_len
);
1285 after_immediate_data
:
1286 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1288 * A PDU/CmdSN carrying Immediate Data passed
1289 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1290 * Immediate Bit is not set.
1292 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1293 (unsigned char *)hdr
, hdr
->cmdsn
);
1294 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1297 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1300 rc
= iscsit_dump_data_payload(cmd
->conn
,
1301 cmd
->first_burst_len
, 1);
1302 target_put_sess_cmd(&cmd
->se_cmd
);
1304 } else if (cmd
->unsolicited_data
)
1305 iscsit_set_unsoliticed_dataout(cmd
);
1307 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1309 * Immediate Data failed DataCRC and ERL>=1,
1310 * silently drop this PDU and let the initiator
1311 * plug the CmdSN gap.
1313 * FIXME: Send Unsolicited NOPIN with reserved
1314 * TTT here to help the initiator figure out
1315 * the missing CmdSN, although they should be
1316 * intelligent enough to determine the missing
1317 * CmdSN and issue a retry to plug the sequence.
1319 cmd
->i_state
= ISTATE_REMOVE
;
1320 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1321 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1328 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1331 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1333 bool dump_payload
= false;
1335 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1339 * Allocation iovecs needed for struct socket operations for
1340 * traditional iSCSI block I/O.
1342 if (iscsit_allocate_iovecs(cmd
) < 0) {
1343 return iscsit_reject_cmd(cmd
,
1344 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1346 immed_data
= cmd
->immediate_data
;
1348 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1352 dump_payload
= true;
1357 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1360 static u32
iscsit_do_crypto_hash_sg(
1361 struct ahash_request
*hash
,
1362 struct iscsi_cmd
*cmd
,
1369 struct scatterlist
*sg
;
1370 unsigned int page_off
;
1372 crypto_ahash_init(hash
);
1374 sg
= cmd
->first_data_sg
;
1375 page_off
= cmd
->first_data_sg_off
;
1377 while (data_length
) {
1378 u32 cur_len
= min_t(u32
, data_length
, (sg
->length
- page_off
));
1380 ahash_request_set_crypt(hash
, sg
, NULL
, cur_len
);
1381 crypto_ahash_update(hash
);
1383 data_length
-= cur_len
;
1385 /* iscsit_map_iovec has already checked for invalid sg pointers */
1390 struct scatterlist pad_sg
;
1392 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1393 ahash_request_set_crypt(hash
, &pad_sg
, (u8
*)&data_crc
,
1395 crypto_ahash_finup(hash
);
1397 ahash_request_set_crypt(hash
, NULL
, (u8
*)&data_crc
, 0);
1398 crypto_ahash_final(hash
);
1404 static void iscsit_do_crypto_hash_buf(
1405 struct ahash_request
*hash
,
1412 struct scatterlist sg
[2];
1414 sg_init_table(sg
, ARRAY_SIZE(sg
));
1415 sg_set_buf(sg
, buf
, payload_length
);
1416 sg_set_buf(sg
+ 1, pad_bytes
, padding
);
1418 ahash_request_set_crypt(hash
, sg
, data_crc
, payload_length
+ padding
);
1420 crypto_ahash_digest(hash
);
1424 __iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1425 struct iscsi_cmd
*cmd
, u32 payload_length
,
1428 struct iscsi_data
*hdr
= buf
;
1429 struct se_cmd
*se_cmd
;
1433 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1435 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1436 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1437 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1438 payload_length
, conn
->cid
);
1440 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1441 pr_err("Command ITT: 0x%08x received DataOUT after"
1442 " last DataOUT received, dumping payload\n",
1443 cmd
->init_task_tag
);
1444 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1447 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1448 pr_err("Command ITT: 0x%08x received DataOUT for a"
1449 " NON-WRITE command.\n", cmd
->init_task_tag
);
1450 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1452 se_cmd
= &cmd
->se_cmd
;
1453 iscsit_mod_dataout_timer(cmd
);
1455 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1456 pr_err("DataOut Offset: %u, Length %u greater than"
1457 " iSCSI Command EDTL %u, protocol error.\n",
1458 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1459 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1462 if (cmd
->unsolicited_data
) {
1463 int dump_unsolicited_data
= 0;
1465 if (conn
->sess
->sess_ops
->InitialR2T
) {
1466 pr_err("Received unexpected unsolicited data"
1467 " while InitialR2T=Yes, protocol error.\n");
1468 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1469 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1473 * Special case for dealing with Unsolicited DataOUT
1474 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478 /* Something's amiss if we're not in WRITE_PENDING state... */
1479 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1480 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1481 dump_unsolicited_data
= 1;
1483 if (dump_unsolicited_data
) {
1485 * Check if a delayed TASK_ABORTED status needs to
1486 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1487 * received with the unsolicited data out.
1489 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1490 iscsit_stop_dataout_timer(cmd
);
1492 transport_check_aborted_status(se_cmd
,
1493 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1494 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1498 * For the normal solicited data path:
1500 * Check for a delayed TASK_ABORTED status and dump any
1501 * incoming data out payload if one exists. Also, when the
1502 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1503 * data out sequence, we decrement outstanding_r2ts. Once
1504 * outstanding_r2ts reaches zero, go ahead and send the delayed
1505 * TASK_ABORTED status.
1507 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1508 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1509 if (--cmd
->outstanding_r2ts
< 1) {
1510 iscsit_stop_dataout_timer(cmd
);
1511 transport_check_aborted_status(
1515 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1519 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1520 * within-command recovery checks before receiving the payload.
1522 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1523 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1525 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1530 EXPORT_SYMBOL(__iscsit_check_dataout_hdr
);
1533 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1534 struct iscsi_cmd
**out_cmd
)
1536 struct iscsi_data
*hdr
= buf
;
1537 struct iscsi_cmd
*cmd
;
1538 u32 payload_length
= ntoh24(hdr
->dlength
);
1540 bool success
= false;
1542 if (!payload_length
) {
1543 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1547 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1548 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1549 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1550 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1551 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1554 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
, payload_length
);
1558 rc
= __iscsit_check_dataout_hdr(conn
, buf
, cmd
, payload_length
, &success
);
1565 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1568 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1569 struct iscsi_data
*hdr
)
1572 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1573 u32 payload_length
= ntoh24(hdr
->dlength
);
1574 int iov_ret
, data_crc_failed
= 0;
1576 rx_size
+= payload_length
;
1577 iov
= &cmd
->iov_data
[0];
1579 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1584 iov_count
+= iov_ret
;
1586 padding
= ((-payload_length
) & 3);
1588 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1589 iov
[iov_count
++].iov_len
= padding
;
1591 pr_debug("Receiving %u padding bytes.\n", padding
);
1594 if (conn
->conn_ops
->DataDigest
) {
1595 iov
[iov_count
].iov_base
= &checksum
;
1596 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1597 rx_size
+= ISCSI_CRC_LEN
;
1600 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1602 iscsit_unmap_iovec(cmd
);
1604 if (rx_got
!= rx_size
)
1607 if (conn
->conn_ops
->DataDigest
) {
1610 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
1611 be32_to_cpu(hdr
->offset
),
1612 payload_length
, padding
,
1615 if (checksum
!= data_crc
) {
1616 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1617 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1618 " does not match computed 0x%08x\n",
1619 hdr
->itt
, hdr
->offset
, payload_length
,
1620 hdr
->datasn
, checksum
, data_crc
);
1621 data_crc_failed
= 1;
1623 pr_debug("Got CRC32C DataDigest 0x%08x for"
1624 " %u bytes of Data Out\n", checksum
,
1629 return data_crc_failed
;
1633 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1634 bool data_crc_failed
)
1636 struct iscsi_conn
*conn
= cmd
->conn
;
1639 * Increment post receive data and CRC values or perform
1640 * within-command recovery.
1642 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1643 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1645 else if (rc
== DATAOUT_SEND_R2T
) {
1646 iscsit_set_dataout_sequence_values(cmd
);
1647 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1648 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1650 * Handle extra special case for out of order
1651 * Unsolicited Data Out.
1653 spin_lock_bh(&cmd
->istate_lock
);
1654 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1655 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1656 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1657 spin_unlock_bh(&cmd
->istate_lock
);
1659 iscsit_stop_dataout_timer(cmd
);
1662 target_execute_cmd(&cmd
->se_cmd
);
1664 } else /* DATAOUT_CANNOT_RECOVER */
1669 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1671 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1673 struct iscsi_cmd
*cmd
= NULL
;
1674 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1676 bool data_crc_failed
= false;
1678 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1684 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1688 data_crc_failed
= true;
1690 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1693 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1694 struct iscsi_nopout
*hdr
)
1696 u32 payload_length
= ntoh24(hdr
->dlength
);
1698 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1699 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1701 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1702 (unsigned char *)hdr
);
1704 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1705 (unsigned char *)hdr
);
1708 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1709 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1710 " not set, protocol error.\n");
1712 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1713 (unsigned char *)hdr
);
1715 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1716 (unsigned char *)hdr
);
1719 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1720 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1721 " greater than MaxXmitDataSegmentLength: %u, protocol"
1722 " error.\n", payload_length
,
1723 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1725 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1726 (unsigned char *)hdr
);
1728 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1729 (unsigned char *)hdr
);
1732 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1733 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1734 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1735 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1738 * This is not a response to a Unsolicited NopIN, which means
1739 * it can either be a NOPOUT ping request (with a valid ITT),
1740 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1741 * Either way, make sure we allocate an struct iscsi_cmd, as both
1742 * can contain ping data.
1744 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1745 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1746 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1747 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1749 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1750 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1751 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1752 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1753 cmd
->data_direction
= DMA_NONE
;
1758 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1760 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1761 struct iscsi_nopout
*hdr
)
1763 struct iscsi_cmd
*cmd_p
= NULL
;
1766 * Initiator is expecting a NopIN ping reply..
1768 if (hdr
->itt
!= RESERVED_ITT
) {
1770 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1771 (unsigned char *)hdr
);
1773 spin_lock_bh(&conn
->cmd_lock
);
1774 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1775 spin_unlock_bh(&conn
->cmd_lock
);
1777 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1779 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1780 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1785 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1786 (unsigned char *)hdr
, hdr
->cmdsn
);
1787 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1789 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1795 * This was a response to a unsolicited NOPIN ping.
1797 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1798 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1802 iscsit_stop_nopin_response_timer(conn
);
1804 cmd_p
->i_state
= ISTATE_REMOVE
;
1805 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1807 iscsit_start_nopin_timer(conn
);
1811 * Otherwise, initiator is not expecting a NOPIN is response.
1812 * Just ignore for now.
1816 iscsit_free_cmd(cmd
, false);
1820 EXPORT_SYMBOL(iscsit_process_nop_out
);
1822 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1825 unsigned char *ping_data
= NULL
;
1826 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1827 struct kvec
*iov
= NULL
;
1828 u32 payload_length
= ntoh24(hdr
->dlength
);
1831 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1835 * Handle NOP-OUT payload for traditional iSCSI sockets
1837 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1838 u32 checksum
, data_crc
, padding
= 0;
1839 int niov
= 0, rx_got
, rx_size
= payload_length
;
1841 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1847 iov
= &cmd
->iov_misc
[0];
1848 iov
[niov
].iov_base
= ping_data
;
1849 iov
[niov
++].iov_len
= payload_length
;
1851 padding
= ((-payload_length
) & 3);
1853 pr_debug("Receiving %u additional bytes"
1854 " for padding.\n", padding
);
1855 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1856 iov
[niov
++].iov_len
= padding
;
1859 if (conn
->conn_ops
->DataDigest
) {
1860 iov
[niov
].iov_base
= &checksum
;
1861 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1862 rx_size
+= ISCSI_CRC_LEN
;
1865 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1866 if (rx_got
!= rx_size
) {
1871 if (conn
->conn_ops
->DataDigest
) {
1872 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
1873 ping_data
, payload_length
,
1874 padding
, cmd
->pad_bytes
,
1877 if (checksum
!= data_crc
) {
1878 pr_err("Ping data CRC32C DataDigest"
1879 " 0x%08x does not match computed 0x%08x\n",
1880 checksum
, data_crc
);
1881 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1882 pr_err("Unable to recover from"
1883 " NOPOUT Ping DataCRC failure while in"
1889 * Silently drop this PDU and let the
1890 * initiator plug the CmdSN gap.
1892 pr_debug("Dropping NOPOUT"
1893 " Command CmdSN: 0x%08x due to"
1894 " DataCRC error.\n", hdr
->cmdsn
);
1899 pr_debug("Got CRC32C DataDigest"
1900 " 0x%08x for %u bytes of ping data.\n",
1901 checksum
, payload_length
);
1905 ping_data
[payload_length
] = '\0';
1907 * Attach ping data to struct iscsi_cmd->buf_ptr.
1909 cmd
->buf_ptr
= ping_data
;
1910 cmd
->buf_ptr_size
= payload_length
;
1912 pr_debug("Got %u bytes of NOPOUT ping"
1913 " data.\n", payload_length
);
1914 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1917 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1920 iscsit_free_cmd(cmd
, false);
1926 static enum tcm_tmreq_table
iscsit_convert_tmf(u8 iscsi_tmf
)
1928 switch (iscsi_tmf
) {
1929 case ISCSI_TM_FUNC_ABORT_TASK
:
1930 return TMR_ABORT_TASK
;
1931 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1932 return TMR_ABORT_TASK_SET
;
1933 case ISCSI_TM_FUNC_CLEAR_ACA
:
1934 return TMR_CLEAR_ACA
;
1935 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1936 return TMR_CLEAR_TASK_SET
;
1937 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1938 return TMR_LUN_RESET
;
1939 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1940 return TMR_TARGET_WARM_RESET
;
1941 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1942 return TMR_TARGET_COLD_RESET
;
1949 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1952 struct se_tmr_req
*se_tmr
;
1953 struct iscsi_tmr_req
*tmr_req
;
1954 struct iscsi_tm
*hdr
;
1955 int out_of_order_cmdsn
= 0, ret
;
1956 bool sess_ref
= false;
1957 u8 function
, tcm_function
= TMR_UNKNOWN
;
1959 hdr
= (struct iscsi_tm
*) buf
;
1960 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1961 function
= hdr
->flags
;
1963 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1964 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1965 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1966 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1968 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1969 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1970 hdr
->rtt
!= RESERVED_ITT
)) {
1971 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1972 hdr
->rtt
= RESERVED_ITT
;
1975 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1976 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1977 pr_err("Task Management Request TASK_REASSIGN not"
1978 " issued as immediate command, bad iSCSI Initiator"
1979 "implementation\n");
1980 return iscsit_add_reject_cmd(cmd
,
1981 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1983 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1984 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1985 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1987 cmd
->data_direction
= DMA_NONE
;
1988 cmd
->tmr_req
= kzalloc(sizeof(*cmd
->tmr_req
), GFP_KERNEL
);
1990 return iscsit_add_reject_cmd(cmd
,
1991 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
1995 * TASK_REASSIGN for ERL=2 / connection stays inside of
1996 * LIO-Target $FABRIC_MOD
1998 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
1999 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
2000 conn
->sess
->se_sess
, 0, DMA_NONE
,
2001 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
2003 target_get_sess_cmd(&cmd
->se_cmd
, true);
2005 tcm_function
= iscsit_convert_tmf(function
);
2006 if (tcm_function
== TMR_UNKNOWN
) {
2007 pr_err("Unknown iSCSI TMR Function:"
2008 " 0x%02x\n", function
);
2009 return iscsit_add_reject_cmd(cmd
,
2010 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2013 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
, tcm_function
,
2016 return iscsit_add_reject_cmd(cmd
,
2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2019 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
2021 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
2022 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
2023 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2024 cmd
->init_task_tag
= hdr
->itt
;
2025 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2026 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2027 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2028 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
2029 tmr_req
= cmd
->tmr_req
;
2031 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2033 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2034 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
2035 scsilun_to_int(&hdr
->lun
));
2037 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
2043 case ISCSI_TM_FUNC_ABORT_TASK
:
2044 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
2045 if (se_tmr
->response
)
2048 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
2049 case ISCSI_TM_FUNC_CLEAR_ACA
:
2050 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
2051 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
2053 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
2054 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
2055 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2059 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
2060 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
2061 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2065 case ISCSI_TM_FUNC_TASK_REASSIGN
:
2066 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
2068 * Perform sanity checks on the ExpDataSN only if the
2069 * TASK_REASSIGN was successful.
2071 if (se_tmr
->response
)
2074 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
2075 return iscsit_add_reject_cmd(cmd
,
2076 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
2079 pr_err("Unknown TMR function: 0x%02x, protocol"
2080 " error.\n", function
);
2081 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
2085 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
2086 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
2087 se_tmr
->call_transport
= 1;
2089 spin_lock_bh(&conn
->cmd_lock
);
2090 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2091 spin_unlock_bh(&conn
->cmd_lock
);
2093 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2094 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2095 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
2096 out_of_order_cmdsn
= 1;
2097 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2099 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2102 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2104 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
2107 * Found the referenced task, send to transport for processing.
2109 if (se_tmr
->call_transport
)
2110 return transport_generic_handle_tmr(&cmd
->se_cmd
);
2113 * Could not find the referenced LUN, task, or Task Management
2114 * command not authorized or supported. Change state and
2115 * let the tx_thread send the response.
2117 * For connection recovery, this is also the default action for
2118 * TMR TASK_REASSIGN.
2121 pr_debug("Handle TMR, using sess_ref=true check\n");
2122 target_put_sess_cmd(&cmd
->se_cmd
);
2125 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2132 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2133 struct iscsi_text
*hdr
)
2135 u32 payload_length
= ntoh24(hdr
->dlength
);
2137 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
2138 pr_err("Unable to accept text parameter length: %u"
2139 "greater than MaxXmitDataSegmentLength %u.\n",
2140 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
2141 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2142 (unsigned char *)hdr
);
2145 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
2146 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
2147 pr_err("Multi sequence text commands currently not supported\n");
2148 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
2149 (unsigned char *)hdr
);
2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
2154 hdr
->exp_statsn
, payload_length
);
2156 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
2157 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
2158 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2159 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2160 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2161 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2162 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2163 cmd
->data_direction
= DMA_NONE
;
2164 cmd
->text_in_ptr
= NULL
;
2168 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2171 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2172 struct iscsi_text
*hdr
)
2174 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2178 cmd
->targ_xfer_tag
= be32_to_cpu(hdr
->ttt
);
2179 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF) {
2180 pr_err("Unable to locate text_in buffer for sendtargets"
2184 goto empty_sendtargets
;
2186 if (strncmp("SendTargets", text_in
, 11) != 0) {
2187 pr_err("Received Text Data that is not"
2188 " SendTargets, cannot continue.\n");
2191 text_ptr
= strchr(text_in
, '=');
2193 pr_err("No \"=\" separator found in Text Data,"
2194 " cannot continue.\n");
2197 if (!strncmp("=All", text_ptr
, 4)) {
2198 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2199 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2200 !strncmp("=eui.", text_ptr
, 5)) {
2201 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2203 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2207 spin_lock_bh(&conn
->cmd_lock
);
2208 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2209 spin_unlock_bh(&conn
->cmd_lock
);
2212 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2214 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2215 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2216 (unsigned char *)hdr
, hdr
->cmdsn
);
2217 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2223 return iscsit_execute_cmd(cmd
, 0);
2226 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2227 (unsigned char *)hdr
);
2229 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2232 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2235 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2236 char *text_in
= NULL
;
2237 u32 payload_length
= ntoh24(hdr
->dlength
);
2240 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2244 rx_size
= payload_length
;
2245 if (payload_length
) {
2246 u32 checksum
= 0, data_crc
= 0;
2247 u32 padding
= 0, pad_bytes
= 0;
2248 int niov
= 0, rx_got
;
2251 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2255 cmd
->text_in_ptr
= text_in
;
2257 memset(iov
, 0, 3 * sizeof(struct kvec
));
2258 iov
[niov
].iov_base
= text_in
;
2259 iov
[niov
++].iov_len
= payload_length
;
2261 padding
= ((-payload_length
) & 3);
2263 iov
[niov
].iov_base
= &pad_bytes
;
2264 iov
[niov
++].iov_len
= padding
;
2266 pr_debug("Receiving %u additional bytes"
2267 " for padding.\n", padding
);
2269 if (conn
->conn_ops
->DataDigest
) {
2270 iov
[niov
].iov_base
= &checksum
;
2271 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2272 rx_size
+= ISCSI_CRC_LEN
;
2275 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2276 if (rx_got
!= rx_size
)
2279 if (conn
->conn_ops
->DataDigest
) {
2280 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
2281 text_in
, payload_length
,
2282 padding
, (u8
*)&pad_bytes
,
2285 if (checksum
!= data_crc
) {
2286 pr_err("Text data CRC32C DataDigest"
2287 " 0x%08x does not match computed"
2288 " 0x%08x\n", checksum
, data_crc
);
2289 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2290 pr_err("Unable to recover from"
2291 " Text Data digest failure while in"
2296 * Silently drop this PDU and let the
2297 * initiator plug the CmdSN gap.
2299 pr_debug("Dropping Text"
2300 " Command CmdSN: 0x%08x due to"
2301 " DataCRC error.\n", hdr
->cmdsn
);
2306 pr_debug("Got CRC32C DataDigest"
2307 " 0x%08x for %u bytes of text data.\n",
2308 checksum
, payload_length
);
2311 text_in
[payload_length
- 1] = '\0';
2312 pr_debug("Successfully read %d bytes of text"
2313 " data.\n", payload_length
);
2316 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2319 kfree(cmd
->text_in_ptr
);
2320 cmd
->text_in_ptr
= NULL
;
2321 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2324 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2326 struct iscsi_conn
*conn_p
;
2327 struct iscsi_session
*sess
= conn
->sess
;
2329 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2332 atomic_set(&sess
->session_logout
, 1);
2333 atomic_set(&conn
->conn_logout_remove
, 1);
2334 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2336 iscsit_inc_conn_usage_count(conn
);
2337 iscsit_inc_session_usage_count(sess
);
2339 spin_lock_bh(&sess
->conn_lock
);
2340 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2341 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2344 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2347 spin_unlock_bh(&sess
->conn_lock
);
2349 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2354 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2356 struct iscsi_conn
*l_conn
;
2357 struct iscsi_session
*sess
= conn
->sess
;
2359 pr_debug("Received logout request CLOSECONNECTION for CID:"
2360 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2363 * A Logout Request with a CLOSECONNECTION reason code for a CID
2364 * can arrive on a connection with a differing CID.
2366 if (conn
->cid
== cmd
->logout_cid
) {
2367 spin_lock_bh(&conn
->state_lock
);
2368 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2371 atomic_set(&conn
->conn_logout_remove
, 1);
2372 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2373 iscsit_inc_conn_usage_count(conn
);
2375 spin_unlock_bh(&conn
->state_lock
);
2378 * Handle all different cid CLOSECONNECTION requests in
2379 * iscsit_logout_post_handler_diffcid() as to give enough
2380 * time for any non immediate command's CmdSN to be
2381 * acknowledged on the connection in question.
2383 * Here we simply make sure the CID is still around.
2385 l_conn
= iscsit_get_conn_from_cid(sess
,
2388 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2389 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2394 iscsit_dec_conn_usage_count(l_conn
);
2397 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2404 struct iscsi_session
*sess
= conn
->sess
;
2406 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2409 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2410 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411 " while ERL!=2.\n");
2412 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2413 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2417 if (conn
->cid
== cmd
->logout_cid
) {
2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419 " with CID: %hu on CID: %hu, implementation error.\n",
2420 cmd
->logout_cid
, conn
->cid
);
2421 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2422 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2426 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2432 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2435 int cmdsn_ret
, logout_remove
= 0;
2437 struct iscsi_logout
*hdr
;
2438 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2440 hdr
= (struct iscsi_logout
*) buf
;
2441 reason_code
= (hdr
->flags
& 0x7f);
2444 spin_lock(&tiqn
->logout_stats
.lock
);
2445 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2446 tiqn
->logout_stats
.normal_logouts
++;
2448 tiqn
->logout_stats
.abnormal_logouts
++;
2449 spin_unlock(&tiqn
->logout_stats
.lock
);
2452 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2455 hdr
->cid
, conn
->cid
);
2457 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2458 pr_err("Received logout request on connection that"
2459 " is not in logged in state, ignoring request.\n");
2460 iscsit_free_cmd(cmd
, false);
2464 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2465 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2466 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2467 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2468 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2469 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2470 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2471 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2472 cmd
->logout_reason
= reason_code
;
2473 cmd
->data_direction
= DMA_NONE
;
2476 * We need to sleep in these cases (by returning 1) until the Logout
2477 * Response gets sent in the tx thread.
2479 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2480 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2481 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2484 spin_lock_bh(&conn
->cmd_lock
);
2485 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2486 spin_unlock_bh(&conn
->cmd_lock
);
2488 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2489 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2492 * Immediate commands are executed, well, immediately.
2493 * Non-Immediate Logout Commands are executed in CmdSN order.
2495 if (cmd
->immediate_cmd
) {
2496 int ret
= iscsit_execute_cmd(cmd
, 0);
2501 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2502 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2504 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2508 return logout_remove
;
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2512 int iscsit_handle_snack(
2513 struct iscsi_conn
*conn
,
2516 struct iscsi_snack
*hdr
;
2518 hdr
= (struct iscsi_snack
*) buf
;
2519 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2521 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2524 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2526 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2527 pr_err("Initiator sent SNACK request while in"
2528 " ErrorRecoveryLevel=0.\n");
2529 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2533 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2534 * call from inside iscsi_send_recovery_datain_or_r2t().
2536 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2538 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2540 be32_to_cpu(hdr
->ttt
),
2541 be32_to_cpu(hdr
->begrun
),
2542 be32_to_cpu(hdr
->runlength
));
2543 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2544 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2545 be32_to_cpu(hdr
->ttt
),
2546 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2547 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2548 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2549 be32_to_cpu(hdr
->begrun
),
2550 be32_to_cpu(hdr
->runlength
));
2551 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2552 /* FIXME: Support R-Data SNACK */
2553 pr_err("R-Data SNACK Not Supported.\n");
2554 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2557 pr_err("Unknown SNACK type 0x%02x, protocol"
2558 " error.\n", hdr
->flags
& 0x0f);
2559 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2565 EXPORT_SYMBOL(iscsit_handle_snack
);
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2569 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2570 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2571 wait_for_completion_interruptible_timeout(
2572 &conn
->rx_half_close_comp
,
2573 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2577 static int iscsit_handle_immediate_data(
2578 struct iscsi_cmd
*cmd
,
2579 struct iscsi_scsi_req
*hdr
,
2582 int iov_ret
, rx_got
= 0, rx_size
= 0;
2583 u32 checksum
, iov_count
= 0, padding
= 0;
2584 struct iscsi_conn
*conn
= cmd
->conn
;
2587 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2589 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2592 iov_count
= iov_ret
;
2593 iov
= &cmd
->iov_data
[0];
2595 padding
= ((-length
) & 3);
2597 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2598 iov
[iov_count
++].iov_len
= padding
;
2602 if (conn
->conn_ops
->DataDigest
) {
2603 iov
[iov_count
].iov_base
= &checksum
;
2604 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2605 rx_size
+= ISCSI_CRC_LEN
;
2608 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2610 iscsit_unmap_iovec(cmd
);
2612 if (rx_got
!= rx_size
) {
2613 iscsit_rx_thread_wait_for_tcp(conn
);
2614 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2617 if (conn
->conn_ops
->DataDigest
) {
2620 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
2621 cmd
->write_data_done
, length
, padding
,
2624 if (checksum
!= data_crc
) {
2625 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626 " does not match computed 0x%08x\n", checksum
,
2629 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2630 pr_err("Unable to recover from"
2631 " Immediate Data digest failure while"
2633 iscsit_reject_cmd(cmd
,
2634 ISCSI_REASON_DATA_DIGEST_ERROR
,
2635 (unsigned char *)hdr
);
2636 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2638 iscsit_reject_cmd(cmd
,
2639 ISCSI_REASON_DATA_DIGEST_ERROR
,
2640 (unsigned char *)hdr
);
2641 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2644 pr_debug("Got CRC32C DataDigest 0x%08x for"
2645 " %u bytes of Immediate Data\n", checksum
,
2650 cmd
->write_data_done
+= length
;
2652 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2653 spin_lock_bh(&cmd
->istate_lock
);
2654 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2655 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2656 spin_unlock_bh(&cmd
->istate_lock
);
2659 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2663 * Called with sess->conn_lock held.
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666 with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2669 struct iscsi_cmd
*cmd
;
2670 struct iscsi_conn
*conn_p
;
2674 * Only send a Asynchronous Message on connections whos network
2675 * interface is still functional.
2677 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2678 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2679 iscsit_inc_conn_usage_count(conn_p
);
2688 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2690 iscsit_dec_conn_usage_count(conn_p
);
2694 cmd
->logout_cid
= conn
->cid
;
2695 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2696 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2698 spin_lock_bh(&conn_p
->cmd_lock
);
2699 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2700 spin_unlock_bh(&conn_p
->cmd_lock
);
2702 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2703 iscsit_dec_conn_usage_count(conn_p
);
2706 static int iscsit_send_conn_drop_async_message(
2707 struct iscsi_cmd
*cmd
,
2708 struct iscsi_conn
*conn
)
2710 struct iscsi_async
*hdr
;
2712 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2714 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2715 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2716 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2717 cmd
->init_task_tag
= RESERVED_ITT
;
2718 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2719 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2720 cmd
->stat_sn
= conn
->stat_sn
++;
2721 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2722 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2723 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2724 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2725 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2726 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2727 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2729 pr_debug("Sending Connection Dropped Async Message StatSN:"
2730 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2731 cmd
->logout_cid
, conn
->cid
);
2733 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2738 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2739 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2740 wait_for_completion_interruptible_timeout(
2741 &conn
->tx_half_close_comp
,
2742 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2747 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2748 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2751 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2752 hdr
->flags
= datain
->flags
;
2753 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2754 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2755 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2756 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2757 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2758 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2759 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2762 hton24(hdr
->dlength
, datain
->length
);
2763 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2764 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2765 (struct scsi_lun
*)&hdr
->lun
);
2767 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2769 hdr
->itt
= cmd
->init_task_tag
;
2771 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2772 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2774 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2776 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2778 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2780 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2781 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2782 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2783 hdr
->offset
= cpu_to_be32(datain
->offset
);
2785 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2788 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu
);
2792 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2794 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2795 struct iscsi_datain datain
;
2796 struct iscsi_datain_req
*dr
;
2798 bool set_statsn
= false;
2800 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2801 dr
= iscsit_get_datain_values(cmd
, &datain
);
2803 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804 cmd
->init_task_tag
);
2808 * Be paranoid and double check the logic for now.
2810 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2811 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812 " datain.length: %u exceeds cmd->data_length: %u\n",
2813 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2814 cmd
->se_cmd
.data_length
);
2818 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2820 * Special case for successfully execution w/ both DATAIN
2823 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2824 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2825 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2827 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2828 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2829 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2830 cmd
->stat_sn
= conn
->stat_sn
++;
2832 } else if (dr
->dr_complete
==
2833 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2837 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2839 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, dr
, &datain
, 0);
2843 if (dr
->dr_complete
) {
2844 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2846 iscsit_free_datain_req(cmd
, dr
);
2853 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2854 struct iscsi_logout_rsp
*hdr
)
2856 struct iscsi_conn
*logout_conn
= NULL
;
2857 struct iscsi_conn_recovery
*cr
= NULL
;
2858 struct iscsi_session
*sess
= conn
->sess
;
2860 * The actual shutting down of Sessions and/or Connections
2861 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862 * is done in scsi_logout_post_handler().
2864 switch (cmd
->logout_reason
) {
2865 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2866 pr_debug("iSCSI session logout successful, setting"
2867 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2870 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2871 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2874 * For CLOSECONNECTION logout requests carrying
2875 * a matching logout CID -> local CID, the reference
2876 * for the local CID will have been incremented in
2877 * iscsi_logout_closeconnection().
2879 * For CLOSECONNECTION logout requests carrying
2880 * a different CID than the connection it arrived
2881 * on, the connection responding to cmd->logout_cid
2882 * is stopped in iscsit_logout_post_handler_diffcid().
2885 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2887 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2889 case ISCSI_LOGOUT_REASON_RECOVERY
:
2890 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2891 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2894 * If the connection is still active from our point of view
2895 * force connection recovery to occur.
2897 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2900 iscsit_connection_reinstatement_rcfr(logout_conn
);
2901 iscsit_dec_conn_usage_count(logout_conn
);
2904 cr
= iscsit_get_inactive_connection_recovery_entry(
2905 conn
->sess
, cmd
->logout_cid
);
2907 pr_err("Unable to locate CID: %hu for"
2908 " REMOVECONNFORRECOVERY Logout Request.\n",
2910 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2914 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2916 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917 " for recovery for CID: %hu on CID: %hu successful.\n",
2918 cmd
->logout_cid
, conn
->cid
);
2919 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2922 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923 cmd
->logout_reason
);
2927 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2928 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2929 hdr
->response
= cmd
->logout_response
;
2930 hdr
->itt
= cmd
->init_task_tag
;
2931 cmd
->stat_sn
= conn
->stat_sn
++;
2932 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2934 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2935 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2936 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2938 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2941 cmd
->logout_cid
, conn
->cid
);
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2948 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2952 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2953 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2957 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2961 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2962 struct iscsi_nopin
*hdr
, bool nopout_response
)
2964 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2965 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2966 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2967 if (nopout_response
)
2968 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2969 hdr
->itt
= cmd
->init_task_tag
;
2970 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2971 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2973 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2975 if (nopout_response
)
2976 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2978 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2979 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2981 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2983 "Solicited" : "Unsolicited", cmd
->init_task_tag
,
2984 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
2989 * Unsolicited NOPIN, either requesting a response or not.
2991 static int iscsit_send_unsolicited_nopin(
2992 struct iscsi_cmd
*cmd
,
2993 struct iscsi_conn
*conn
,
2996 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
2999 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
3001 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
3004 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3008 spin_lock_bh(&cmd
->istate_lock
);
3009 cmd
->i_state
= want_response
?
3010 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
3011 spin_unlock_bh(&cmd
->istate_lock
);
3017 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3019 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3021 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
3024 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3027 pr_debug("Echoing back %u bytes of ping data.\n", cmd
->buf_ptr_size
);
3029 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3034 static int iscsit_send_r2t(
3035 struct iscsi_cmd
*cmd
,
3036 struct iscsi_conn
*conn
)
3038 struct iscsi_r2t
*r2t
;
3039 struct iscsi_r2t_rsp
*hdr
;
3042 r2t
= iscsit_get_r2t_from_list(cmd
);
3046 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3047 memset(hdr
, 0, ISCSI_HDR_LEN
);
3048 hdr
->opcode
= ISCSI_OP_R2T
;
3049 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3050 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3051 (struct scsi_lun
*)&hdr
->lun
);
3052 hdr
->itt
= cmd
->init_task_tag
;
3053 if (conn
->conn_transport
->iscsit_get_r2t_ttt
)
3054 conn
->conn_transport
->iscsit_get_r2t_ttt(conn
, cmd
, r2t
);
3056 r2t
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3057 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3058 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3059 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3060 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3061 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3062 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3063 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3065 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3068 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3069 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3071 spin_lock_bh(&cmd
->r2t_lock
);
3073 spin_unlock_bh(&cmd
->r2t_lock
);
3075 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3080 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3081 iscsit_start_dataout_timer(cmd
, conn
);
3082 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3088 * @recovery: If called from iscsi_task_reassign_complete_write() for
3089 * connection recovery.
3091 int iscsit_build_r2ts_for_cmd(
3092 struct iscsi_conn
*conn
,
3093 struct iscsi_cmd
*cmd
,
3097 u32 offset
= 0, xfer_len
= 0;
3099 spin_lock_bh(&cmd
->r2t_lock
);
3100 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3101 spin_unlock_bh(&cmd
->r2t_lock
);
3105 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3107 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3109 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3110 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3111 offset
= cmd
->r2t_offset
;
3113 if (first_r2t
&& recovery
) {
3114 int new_data_end
= offset
+
3115 conn
->sess
->sess_ops
->MaxBurstLength
-
3116 cmd
->next_burst_len
;
3118 if (new_data_end
> cmd
->se_cmd
.data_length
)
3119 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3122 conn
->sess
->sess_ops
->MaxBurstLength
-
3123 cmd
->next_burst_len
;
3125 int new_data_end
= offset
+
3126 conn
->sess
->sess_ops
->MaxBurstLength
;
3128 if (new_data_end
> cmd
->se_cmd
.data_length
)
3129 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3131 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3133 cmd
->r2t_offset
+= xfer_len
;
3135 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3136 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3138 struct iscsi_seq
*seq
;
3140 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3142 spin_unlock_bh(&cmd
->r2t_lock
);
3146 offset
= seq
->offset
;
3147 xfer_len
= seq
->xfer_len
;
3149 if (cmd
->seq_send_order
== cmd
->seq_count
)
3150 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3152 cmd
->outstanding_r2ts
++;
3155 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3156 spin_unlock_bh(&cmd
->r2t_lock
);
3160 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3163 spin_unlock_bh(&cmd
->r2t_lock
);
3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd
);
3169 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3170 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3173 cmd
->stat_sn
= conn
->stat_sn
++;
3175 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3177 memset(hdr
, 0, ISCSI_HDR_LEN
);
3178 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3179 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3180 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3181 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3182 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3183 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3184 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3185 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3187 hdr
->response
= cmd
->iscsi_response
;
3188 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3189 hdr
->itt
= cmd
->init_task_tag
;
3190 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3192 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3193 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3194 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3196 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3199 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3203 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3205 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3206 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3207 void *data_buf
= NULL
;
3208 u32 padding
= 0, data_buf_len
= 0;
3210 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3213 * Attach SENSE DATA payload to iSCSI Response PDU
3215 if (cmd
->se_cmd
.sense_buffer
&&
3216 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3217 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3218 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3219 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3221 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3222 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3223 data_buf
= cmd
->sense_buffer
;
3224 data_buf_len
= cmd
->se_cmd
.scsi_sense_length
+ padding
;
3227 memset(cmd
->sense_buffer
+
3228 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3229 pr_debug("Adding %u bytes of padding to"
3230 " SENSE.\n", padding
);
3233 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3235 cmd
->se_cmd
.scsi_sense_length
);
3238 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, data_buf
,
3242 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3244 switch (se_tmr
->response
) {
3245 case TMR_FUNCTION_COMPLETE
:
3246 return ISCSI_TMF_RSP_COMPLETE
;
3247 case TMR_TASK_DOES_NOT_EXIST
:
3248 return ISCSI_TMF_RSP_NO_TASK
;
3249 case TMR_LUN_DOES_NOT_EXIST
:
3250 return ISCSI_TMF_RSP_NO_LUN
;
3251 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3252 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3253 case TMR_FUNCTION_REJECTED
:
3255 return ISCSI_TMF_RSP_REJECTED
;
3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3261 struct iscsi_tm_rsp
*hdr
)
3263 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3265 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3266 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3267 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3268 hdr
->itt
= cmd
->init_task_tag
;
3269 cmd
->stat_sn
= conn
->stat_sn
++;
3270 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3272 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3273 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3274 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3276 pr_debug("Built Task Management Response ITT: 0x%08x,"
3277 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3278 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3285 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3287 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3289 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3292 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3296 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3297 const struct sockaddr_in6 sin6
= {
3298 .sin6_addr
= IN6ADDR_ANY_INIT
};
3299 struct sockaddr_in6
*sock_in6
=
3300 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3302 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3303 sin6
.sin6_addr
.s6_addr
, 16))
3306 struct sockaddr_in
* sock_in
=
3307 (struct sockaddr_in
*)&np
->np_sockaddr
;
3309 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3316 #define SENDTARGETS_BUF_LIMIT 32768U
3319 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3320 enum iscsit_transport_type network_transport
,
3321 int skip_bytes
, bool *completed
)
3323 char *payload
= NULL
;
3324 struct iscsi_conn
*conn
= cmd
->conn
;
3325 struct iscsi_portal_group
*tpg
;
3326 struct iscsi_tiqn
*tiqn
;
3327 struct iscsi_tpg_np
*tpg_np
;
3328 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3329 int target_name_printed
;
3330 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3331 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3334 buffer_len
= min(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3335 SENDTARGETS_BUF_LIMIT
);
3337 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3342 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3345 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3346 text_ptr
= strchr(text_in
, '=');
3348 pr_err("Unable to locate '=' string in text_in:"
3354 * Skip over '=' character..
3359 spin_lock(&tiqn_lock
);
3360 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3361 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3362 strcmp(tiqn
->tiqn
, text_ptr
)) {
3366 target_name_printed
= 0;
3368 spin_lock(&tiqn
->tiqn_tpg_lock
);
3369 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3371 /* If demo_mode_discovery=0 and generate_node_acls=0
3372 * (demo mode dislabed) do not return
3373 * TargetName+TargetAddress unless a NodeACL exists.
3376 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3377 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3378 (!target_tpg_has_node_acl(&tpg
->tpg_se_tpg
,
3379 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3383 spin_lock(&tpg
->tpg_state_lock
);
3384 active
= (tpg
->tpg_state
== TPG_STATE_ACTIVE
);
3385 spin_unlock(&tpg
->tpg_state_lock
);
3387 if (!active
&& tpg
->tpg_attrib
.tpg_enabled_sendtargets
)
3390 spin_lock(&tpg
->tpg_np_lock
);
3391 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3393 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3394 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3395 struct sockaddr_storage
*sockaddr
;
3397 if (np
->np_network_transport
!= network_transport
)
3400 if (!target_name_printed
) {
3401 len
= sprintf(buf
, "TargetName=%s",
3405 if ((len
+ payload_len
) > buffer_len
) {
3406 spin_unlock(&tpg
->tpg_np_lock
);
3407 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3412 if (skip_bytes
&& len
<= skip_bytes
) {
3415 memcpy(payload
+ payload_len
, buf
, len
);
3417 target_name_printed
= 1;
3418 if (len
> skip_bytes
)
3424 sockaddr
= &conn
->local_sockaddr
;
3426 sockaddr
= &np
->np_sockaddr
;
3428 len
= sprintf(buf
, "TargetAddress="
3434 if ((len
+ payload_len
) > buffer_len
) {
3435 spin_unlock(&tpg
->tpg_np_lock
);
3436 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3441 if (skip_bytes
&& len
<= skip_bytes
) {
3444 memcpy(payload
+ payload_len
, buf
, len
);
3446 if (len
> skip_bytes
)
3450 spin_unlock(&tpg
->tpg_np_lock
);
3452 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3459 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3462 spin_unlock(&tiqn_lock
);
3464 cmd
->buf_ptr
= payload
;
3470 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3471 struct iscsi_text_rsp
*hdr
,
3472 enum iscsit_transport_type network_transport
)
3474 int text_length
, padding
;
3475 bool completed
= true;
3477 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
,
3478 cmd
->read_data_done
,
3480 if (text_length
< 0)
3484 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3486 hdr
->flags
|= ISCSI_FLAG_TEXT_CONTINUE
;
3487 cmd
->read_data_done
+= text_length
;
3488 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
3489 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3491 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3492 padding
= ((-text_length
) & 3);
3493 hton24(hdr
->dlength
, text_length
);
3494 hdr
->itt
= cmd
->init_task_tag
;
3495 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3496 cmd
->stat_sn
= conn
->stat_sn
++;
3497 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3499 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3501 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3502 * correctly increment MaxCmdSN for each response answering a
3503 * non immediate text request with a valid CmdSN.
3505 cmd
->maxcmdsn_inc
= 0;
3506 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3507 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3509 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3510 " Length: %u, CID: %hu F: %d C: %d\n", cmd
->init_task_tag
,
3511 cmd
->targ_xfer_tag
, cmd
->stat_sn
, text_length
, conn
->cid
,
3512 !!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
),
3513 !!(hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
));
3515 return text_length
+ padding
;
3517 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3519 static int iscsit_send_text_rsp(
3520 struct iscsi_cmd
*cmd
,
3521 struct iscsi_conn
*conn
)
3523 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3526 text_length
= iscsit_build_text_rsp(cmd
, conn
, hdr
,
3527 conn
->conn_transport
->transport_type
);
3528 if (text_length
< 0)
3531 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3537 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3538 struct iscsi_reject
*hdr
)
3540 hdr
->opcode
= ISCSI_OP_REJECT
;
3541 hdr
->reason
= cmd
->reject_reason
;
3542 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3543 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3544 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3545 cmd
->stat_sn
= conn
->stat_sn
++;
3546 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3547 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3548 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3551 EXPORT_SYMBOL(iscsit_build_reject
);
3553 static int iscsit_send_reject(
3554 struct iscsi_cmd
*cmd
,
3555 struct iscsi_conn
*conn
)
3557 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3559 iscsit_build_reject(cmd
, conn
, hdr
);
3561 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3562 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3564 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3569 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3573 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3574 * within iscsit_start_kthreads()
3576 * Here we use bitmap_id to determine which CPU that this
3577 * iSCSI connection's RX/TX threads will be scheduled to
3580 ord
= conn
->bitmap_id
% cpumask_weight(cpu_online_mask
);
3581 for_each_online_cpu(cpu
) {
3583 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3588 * This should never be reached..
3591 cpumask_setall(conn
->conn_cpumask
);
3595 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3600 case ISTATE_SEND_R2T
:
3601 ret
= iscsit_send_r2t(cmd
, conn
);
3606 spin_lock_bh(&conn
->cmd_lock
);
3607 list_del_init(&cmd
->i_conn_node
);
3608 spin_unlock_bh(&conn
->cmd_lock
);
3610 iscsit_free_cmd(cmd
, false);
3612 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3613 iscsit_mod_nopin_response_timer(conn
);
3614 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3618 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3619 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3624 pr_err("Unknown Opcode: 0x%02x ITT:"
3625 " 0x%08x, i_state: %d on CID: %hu\n",
3626 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3636 EXPORT_SYMBOL(iscsit_immediate_queue
);
3639 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3641 struct iscsit_transport
*t
= conn
->conn_transport
;
3642 struct iscsi_queue_req
*qr
;
3643 struct iscsi_cmd
*cmd
;
3647 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3648 atomic_set(&conn
->check_immediate_queue
, 0);
3651 kmem_cache_free(lio_qr_cache
, qr
);
3653 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3662 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3668 case ISTATE_SEND_DATAIN
:
3669 ret
= iscsit_send_datain(cmd
, conn
);
3674 goto check_rsp_state
;
3675 else if (ret
== 1) {
3677 spin_lock_bh(&cmd
->istate_lock
);
3678 cmd
->i_state
= ISTATE_SENT_STATUS
;
3679 spin_unlock_bh(&cmd
->istate_lock
);
3681 if (atomic_read(&conn
->check_immediate_queue
))
3685 } else if (ret
== 2) {
3686 /* Still must send status,
3687 SCF_TRANSPORT_TASK_SENSE was set */
3688 spin_lock_bh(&cmd
->istate_lock
);
3689 cmd
->i_state
= ISTATE_SEND_STATUS
;
3690 spin_unlock_bh(&cmd
->istate_lock
);
3691 state
= ISTATE_SEND_STATUS
;
3692 goto check_rsp_state
;
3696 case ISTATE_SEND_STATUS
:
3697 case ISTATE_SEND_STATUS_RECOVERY
:
3698 ret
= iscsit_send_response(cmd
, conn
);
3700 case ISTATE_SEND_LOGOUTRSP
:
3701 ret
= iscsit_send_logout(cmd
, conn
);
3703 case ISTATE_SEND_ASYNCMSG
:
3704 ret
= iscsit_send_conn_drop_async_message(
3707 case ISTATE_SEND_NOPIN
:
3708 ret
= iscsit_send_nopin(cmd
, conn
);
3710 case ISTATE_SEND_REJECT
:
3711 ret
= iscsit_send_reject(cmd
, conn
);
3713 case ISTATE_SEND_TASKMGTRSP
:
3714 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3717 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3719 iscsit_fall_back_to_erl0(conn
->sess
);
3721 case ISTATE_SEND_TEXTRSP
:
3722 ret
= iscsit_send_text_rsp(cmd
, conn
);
3725 pr_err("Unknown Opcode: 0x%02x ITT:"
3726 " 0x%08x, i_state: %d on CID: %hu\n",
3727 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3735 case ISTATE_SEND_LOGOUTRSP
:
3736 if (!iscsit_logout_post_handler(cmd
, conn
))
3739 case ISTATE_SEND_STATUS
:
3740 case ISTATE_SEND_ASYNCMSG
:
3741 case ISTATE_SEND_NOPIN
:
3742 case ISTATE_SEND_STATUS_RECOVERY
:
3743 case ISTATE_SEND_TEXTRSP
:
3744 case ISTATE_SEND_TASKMGTRSP
:
3745 case ISTATE_SEND_REJECT
:
3746 spin_lock_bh(&cmd
->istate_lock
);
3747 cmd
->i_state
= ISTATE_SENT_STATUS
;
3748 spin_unlock_bh(&cmd
->istate_lock
);
3751 pr_err("Unknown Opcode: 0x%02x ITT:"
3752 " 0x%08x, i_state: %d on CID: %hu\n",
3753 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3754 cmd
->i_state
, conn
->cid
);
3758 if (atomic_read(&conn
->check_immediate_queue
))
3766 EXPORT_SYMBOL(iscsit_response_queue
);
3768 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3770 struct iscsit_transport
*t
= conn
->conn_transport
;
3771 struct iscsi_queue_req
*qr
;
3772 struct iscsi_cmd
*cmd
;
3776 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3779 kmem_cache_free(lio_qr_cache
, qr
);
3781 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3782 if (ret
== 1 || ret
< 0)
3789 int iscsi_target_tx_thread(void *arg
)
3792 struct iscsi_conn
*conn
= arg
;
3794 * Allow ourselves to be interrupted by SIGINT so that a
3795 * connection recovery / failure event can be triggered externally.
3797 allow_signal(SIGINT
);
3799 while (!kthread_should_stop()) {
3801 * Ensure that both TX and RX per connection kthreads
3802 * are scheduled to run on the same CPU.
3804 iscsit_thread_check_cpumask(conn
, current
, 1);
3806 wait_event_interruptible(conn
->queues_wq
,
3807 !iscsit_conn_all_queues_empty(conn
));
3809 if (signal_pending(current
))
3813 ret
= iscsit_handle_immediate_queue(conn
);
3817 ret
= iscsit_handle_response_queue(conn
);
3820 else if (ret
== -ECONNRESET
)
3828 * Avoid the normal connection failure code-path if this connection
3829 * is still within LOGIN mode, and iscsi_np process context is
3830 * responsible for cleaning up the early connection failure.
3832 if (conn
->conn_state
!= TARG_CONN_STATE_IN_LOGIN
)
3833 iscsit_take_action_for_connection_exit(conn
);
3838 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
3840 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
3841 struct iscsi_cmd
*cmd
;
3844 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
3845 case ISCSI_OP_SCSI_CMD
:
3846 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3850 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
3852 case ISCSI_OP_SCSI_DATA_OUT
:
3853 ret
= iscsit_handle_data_out(conn
, buf
);
3855 case ISCSI_OP_NOOP_OUT
:
3857 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
3858 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3862 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
3864 case ISCSI_OP_SCSI_TMFUNC
:
3865 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3869 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
3872 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
3873 cmd
= iscsit_find_cmd_from_itt(conn
, hdr
->itt
);
3877 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3882 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
3884 case ISCSI_OP_LOGOUT
:
3885 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3889 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
3891 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3892 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3894 case ISCSI_OP_SNACK
:
3895 ret
= iscsit_handle_snack(conn
, buf
);
3898 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
3899 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3900 pr_err("Cannot recover from unknown"
3901 " opcode while ERL=0, closing iSCSI connection.\n");
3904 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3905 " closing iSCSI connection.\n");
3912 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
3915 static bool iscsi_target_check_conn_state(struct iscsi_conn
*conn
)
3919 spin_lock_bh(&conn
->state_lock
);
3920 ret
= (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
);
3921 spin_unlock_bh(&conn
->state_lock
);
3926 static void iscsit_get_rx_pdu(struct iscsi_conn
*conn
)
3929 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3930 u32 checksum
= 0, digest
= 0;
3933 while (!kthread_should_stop()) {
3935 * Ensure that both TX and RX per connection kthreads
3936 * are scheduled to run on the same CPU.
3938 iscsit_thread_check_cpumask(conn
, current
, 0);
3940 memset(buffer
, 0, ISCSI_HDR_LEN
);
3941 memset(&iov
, 0, sizeof(struct kvec
));
3943 iov
.iov_base
= buffer
;
3944 iov
.iov_len
= ISCSI_HDR_LEN
;
3946 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3947 if (ret
!= ISCSI_HDR_LEN
) {
3948 iscsit_rx_thread_wait_for_tcp(conn
);
3952 if (conn
->conn_ops
->HeaderDigest
) {
3953 iov
.iov_base
= &digest
;
3954 iov
.iov_len
= ISCSI_CRC_LEN
;
3956 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3957 if (ret
!= ISCSI_CRC_LEN
) {
3958 iscsit_rx_thread_wait_for_tcp(conn
);
3962 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
3963 buffer
, ISCSI_HDR_LEN
,
3964 0, NULL
, (u8
*)&checksum
);
3966 if (digest
!= checksum
) {
3967 pr_err("HeaderDigest CRC32C failed,"
3968 " received 0x%08x, computed 0x%08x\n",
3971 * Set the PDU to 0xff so it will intentionally
3972 * hit default in the switch below.
3974 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3975 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
3977 pr_debug("Got HeaderDigest CRC32C"
3978 " 0x%08x\n", checksum
);
3982 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
3985 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
3987 if (conn
->sess
->sess_ops
->SessionType
&&
3988 ((!(opcode
& ISCSI_OP_TEXT
)) ||
3989 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
3990 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3991 " while in Discovery Session, rejecting.\n", opcode
);
3992 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
3997 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4003 int iscsi_target_rx_thread(void *arg
)
4006 struct iscsi_conn
*conn
= arg
;
4009 * Allow ourselves to be interrupted by SIGINT so that a
4010 * connection recovery / failure event can be triggered externally.
4012 allow_signal(SIGINT
);
4014 * Wait for iscsi_post_login_handler() to complete before allowing
4015 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4017 rc
= wait_for_completion_interruptible(&conn
->rx_login_comp
);
4018 if (rc
< 0 || iscsi_target_check_conn_state(conn
))
4021 if (!conn
->conn_transport
->iscsit_get_rx_pdu
)
4024 conn
->conn_transport
->iscsit_get_rx_pdu(conn
);
4026 if (!signal_pending(current
))
4027 atomic_set(&conn
->transport_failed
, 1);
4028 iscsit_take_action_for_connection_exit(conn
);
4032 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4034 LIST_HEAD(tmp_list
);
4035 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4036 struct iscsi_session
*sess
= conn
->sess
;
4038 * We expect this function to only ever be called from either RX or TX
4039 * thread context via iscsit_close_connection() once the other context
4040 * has been reset -> returned sleeping pre-handler state.
4042 spin_lock_bh(&conn
->cmd_lock
);
4043 list_splice_init(&conn
->conn_cmd_list
, &tmp_list
);
4045 list_for_each_entry(cmd
, &tmp_list
, i_conn_node
) {
4046 struct se_cmd
*se_cmd
= &cmd
->se_cmd
;
4048 if (se_cmd
->se_tfo
!= NULL
) {
4049 spin_lock(&se_cmd
->t_state_lock
);
4050 se_cmd
->transport_state
|= CMD_T_FABRIC_STOP
;
4051 spin_unlock(&se_cmd
->t_state_lock
);
4054 spin_unlock_bh(&conn
->cmd_lock
);
4056 list_for_each_entry_safe(cmd
, cmd_tmp
, &tmp_list
, i_conn_node
) {
4057 list_del_init(&cmd
->i_conn_node
);
4059 iscsit_increment_maxcmdsn(cmd
, sess
);
4060 iscsit_free_cmd(cmd
, true);
4065 static void iscsit_stop_timers_for_cmds(
4066 struct iscsi_conn
*conn
)
4068 struct iscsi_cmd
*cmd
;
4070 spin_lock_bh(&conn
->cmd_lock
);
4071 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4072 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4073 iscsit_stop_dataout_timer(cmd
);
4075 spin_unlock_bh(&conn
->cmd_lock
);
4078 int iscsit_close_connection(
4079 struct iscsi_conn
*conn
)
4081 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4082 struct iscsi_session
*sess
= conn
->sess
;
4084 pr_debug("Closing iSCSI connection CID %hu on SID:"
4085 " %u\n", conn
->cid
, sess
->sid
);
4087 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4088 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4089 * sleeping and the logout response never got sent because the
4090 * connection failed.
4092 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4093 * to signal logout response TX interrupt completion. Go ahead and skip
4094 * this for iser since isert_rx_opcode() does not wait on logout failure,
4095 * and to avoid iscsi_conn pointer dereference in iser-target code.
4097 if (!conn
->conn_transport
->rdma_shutdown
)
4098 complete(&conn
->conn_logout_comp
);
4100 if (!strcmp(current
->comm
, ISCSI_RX_THREAD_NAME
)) {
4101 if (conn
->tx_thread
&&
4102 cmpxchg(&conn
->tx_thread_active
, true, false)) {
4103 send_sig(SIGINT
, conn
->tx_thread
, 1);
4104 kthread_stop(conn
->tx_thread
);
4106 } else if (!strcmp(current
->comm
, ISCSI_TX_THREAD_NAME
)) {
4107 if (conn
->rx_thread
&&
4108 cmpxchg(&conn
->rx_thread_active
, true, false)) {
4109 send_sig(SIGINT
, conn
->rx_thread
, 1);
4110 kthread_stop(conn
->rx_thread
);
4114 spin_lock(&iscsit_global
->ts_bitmap_lock
);
4115 bitmap_release_region(iscsit_global
->ts_bitmap
, conn
->bitmap_id
,
4117 spin_unlock(&iscsit_global
->ts_bitmap_lock
);
4119 iscsit_stop_timers_for_cmds(conn
);
4120 iscsit_stop_nopin_response_timer(conn
);
4121 iscsit_stop_nopin_timer(conn
);
4123 if (conn
->conn_transport
->iscsit_wait_conn
)
4124 conn
->conn_transport
->iscsit_wait_conn(conn
);
4127 * During Connection recovery drop unacknowledged out of order
4128 * commands for this connection, and prepare the other commands
4131 * During normal operation clear the out of order commands (but
4132 * do not free the struct iscsi_ooo_cmdsn's) and release all
4133 * struct iscsi_cmds.
4135 if (atomic_read(&conn
->connection_recovery
)) {
4136 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4137 iscsit_prepare_cmds_for_reallegiance(conn
);
4139 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4140 iscsit_release_commands_from_conn(conn
);
4142 iscsit_free_queue_reqs_for_conn(conn
);
4145 * Handle decrementing session or connection usage count if
4146 * a logout response was not able to be sent because the
4147 * connection failed. Fall back to Session Recovery here.
4149 if (atomic_read(&conn
->conn_logout_remove
)) {
4150 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4151 iscsit_dec_conn_usage_count(conn
);
4152 iscsit_dec_session_usage_count(sess
);
4154 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4155 iscsit_dec_conn_usage_count(conn
);
4157 atomic_set(&conn
->conn_logout_remove
, 0);
4158 atomic_set(&sess
->session_reinstatement
, 0);
4159 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4162 spin_lock_bh(&sess
->conn_lock
);
4163 list_del(&conn
->conn_list
);
4166 * Attempt to let the Initiator know this connection failed by
4167 * sending an Connection Dropped Async Message on another
4168 * active connection.
4170 if (atomic_read(&conn
->connection_recovery
))
4171 iscsit_build_conn_drop_async_message(conn
);
4173 spin_unlock_bh(&sess
->conn_lock
);
4176 * If connection reinstatement is being performed on this connection,
4177 * up the connection reinstatement semaphore that is being blocked on
4178 * in iscsit_cause_connection_reinstatement().
4180 spin_lock_bh(&conn
->state_lock
);
4181 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4182 spin_unlock_bh(&conn
->state_lock
);
4183 complete(&conn
->conn_wait_comp
);
4184 wait_for_completion(&conn
->conn_post_wait_comp
);
4185 spin_lock_bh(&conn
->state_lock
);
4189 * If connection reinstatement is being performed on this connection
4190 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4191 * connection wait rcfr semaphore that is being blocked on
4192 * an iscsit_connection_reinstatement_rcfr().
4194 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4195 spin_unlock_bh(&conn
->state_lock
);
4196 complete(&conn
->conn_wait_rcfr_comp
);
4197 wait_for_completion(&conn
->conn_post_wait_comp
);
4198 spin_lock_bh(&conn
->state_lock
);
4200 atomic_set(&conn
->connection_reinstatement
, 1);
4201 spin_unlock_bh(&conn
->state_lock
);
4204 * If any other processes are accessing this connection pointer we
4205 * must wait until they have completed.
4207 iscsit_check_conn_usage_count(conn
);
4209 ahash_request_free(conn
->conn_tx_hash
);
4210 if (conn
->conn_rx_hash
) {
4211 struct crypto_ahash
*tfm
;
4213 tfm
= crypto_ahash_reqtfm(conn
->conn_rx_hash
);
4214 ahash_request_free(conn
->conn_rx_hash
);
4215 crypto_free_ahash(tfm
);
4218 free_cpumask_var(conn
->conn_cpumask
);
4220 kfree(conn
->conn_ops
);
4221 conn
->conn_ops
= NULL
;
4224 sock_release(conn
->sock
);
4226 if (conn
->conn_transport
->iscsit_free_conn
)
4227 conn
->conn_transport
->iscsit_free_conn(conn
);
4229 iscsit_put_transport(conn
->conn_transport
);
4231 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4232 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4235 spin_lock_bh(&sess
->conn_lock
);
4236 atomic_dec(&sess
->nconn
);
4237 pr_debug("Decremented iSCSI connection count to %hu from node:"
4238 " %s\n", atomic_read(&sess
->nconn
),
4239 sess
->sess_ops
->InitiatorName
);
4241 * Make sure that if one connection fails in an non ERL=2 iSCSI
4242 * Session that they all fail.
4244 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4245 !atomic_read(&sess
->session_logout
))
4246 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4249 * If this was not the last connection in the session, and we are
4250 * performing session reinstatement or falling back to ERL=0, call
4251 * iscsit_stop_session() without sleeping to shutdown the other
4252 * active connections.
4254 if (atomic_read(&sess
->nconn
)) {
4255 if (!atomic_read(&sess
->session_reinstatement
) &&
4256 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4257 spin_unlock_bh(&sess
->conn_lock
);
4260 if (!atomic_read(&sess
->session_stop_active
)) {
4261 atomic_set(&sess
->session_stop_active
, 1);
4262 spin_unlock_bh(&sess
->conn_lock
);
4263 iscsit_stop_session(sess
, 0, 0);
4266 spin_unlock_bh(&sess
->conn_lock
);
4271 * If this was the last connection in the session and one of the
4272 * following is occurring:
4274 * Session Reinstatement is not being performed, and are falling back
4275 * to ERL=0 call iscsit_close_session().
4277 * Session Logout was requested. iscsit_close_session() will be called
4280 * Session Continuation is not being performed, start the Time2Retain
4281 * handler and check if sleep_on_sess_wait_sem is active.
4283 if (!atomic_read(&sess
->session_reinstatement
) &&
4284 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4285 spin_unlock_bh(&sess
->conn_lock
);
4286 iscsit_close_session(sess
);
4289 } else if (atomic_read(&sess
->session_logout
)) {
4290 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4291 sess
->session_state
= TARG_SESS_STATE_FREE
;
4292 spin_unlock_bh(&sess
->conn_lock
);
4294 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4295 complete(&sess
->session_wait_comp
);
4299 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4300 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4302 if (!atomic_read(&sess
->session_continuation
)) {
4303 spin_unlock_bh(&sess
->conn_lock
);
4304 iscsit_start_time2retain_handler(sess
);
4306 spin_unlock_bh(&sess
->conn_lock
);
4308 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4309 complete(&sess
->session_wait_comp
);
4316 * If the iSCSI Session for the iSCSI Initiator Node exists,
4317 * forcefully shutdown the iSCSI NEXUS.
4319 int iscsit_close_session(struct iscsi_session
*sess
)
4321 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4322 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4324 if (atomic_read(&sess
->nconn
)) {
4325 pr_err("%d connection(s) still exist for iSCSI session"
4326 " to %s\n", atomic_read(&sess
->nconn
),
4327 sess
->sess_ops
->InitiatorName
);
4331 spin_lock_bh(&se_tpg
->session_lock
);
4332 atomic_set(&sess
->session_logout
, 1);
4333 atomic_set(&sess
->session_reinstatement
, 1);
4334 iscsit_stop_time2retain_timer(sess
);
4335 spin_unlock_bh(&se_tpg
->session_lock
);
4338 * transport_deregister_session_configfs() will clear the
4339 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4340 * can be setting it again with __transport_register_session() in
4341 * iscsi_post_login_handler() again after the iscsit_stop_session()
4342 * completes in iscsi_np context.
4344 transport_deregister_session_configfs(sess
->se_sess
);
4347 * If any other processes are accessing this session pointer we must
4348 * wait until they have completed. If we are in an interrupt (the
4349 * time2retain handler) and contain and active session usage count we
4350 * restart the timer and exit.
4352 if (!in_interrupt()) {
4353 if (iscsit_check_session_usage_count(sess
) == 1)
4354 iscsit_stop_session(sess
, 1, 1);
4356 if (iscsit_check_session_usage_count(sess
) == 2) {
4357 atomic_set(&sess
->session_logout
, 0);
4358 iscsit_start_time2retain_handler(sess
);
4363 transport_deregister_session(sess
->se_sess
);
4365 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4366 iscsit_free_connection_recovery_entires(sess
);
4368 iscsit_free_all_ooo_cmdsns(sess
);
4370 spin_lock_bh(&se_tpg
->session_lock
);
4371 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4372 sess
->session_state
= TARG_SESS_STATE_FREE
;
4373 pr_debug("Released iSCSI session from node: %s\n",
4374 sess
->sess_ops
->InitiatorName
);
4377 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4379 pr_debug("Decremented number of active iSCSI Sessions on"
4380 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4382 spin_lock(&sess_idr_lock
);
4383 idr_remove(&sess_idr
, sess
->session_index
);
4384 spin_unlock(&sess_idr_lock
);
4386 kfree(sess
->sess_ops
);
4387 sess
->sess_ops
= NULL
;
4388 spin_unlock_bh(&se_tpg
->session_lock
);
4394 static void iscsit_logout_post_handler_closesession(
4395 struct iscsi_conn
*conn
)
4397 struct iscsi_session
*sess
= conn
->sess
;
4400 * Traditional iscsi/tcp will invoke this logic from TX thread
4401 * context during session logout, so clear tx_thread_active and
4402 * sleep if iscsit_close_connection() has not already occured.
4404 * Since iser-target invokes this logic from it's own workqueue,
4405 * always sleep waiting for RX/TX thread shutdown to complete
4406 * within iscsit_close_connection().
4408 if (!conn
->conn_transport
->rdma_shutdown
)
4409 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4411 atomic_set(&conn
->conn_logout_remove
, 0);
4412 complete(&conn
->conn_logout_comp
);
4414 iscsit_dec_conn_usage_count(conn
);
4415 iscsit_stop_session(sess
, sleep
, sleep
);
4416 iscsit_dec_session_usage_count(sess
);
4417 iscsit_close_session(sess
);
4420 static void iscsit_logout_post_handler_samecid(
4421 struct iscsi_conn
*conn
)
4425 if (!conn
->conn_transport
->rdma_shutdown
)
4426 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4428 atomic_set(&conn
->conn_logout_remove
, 0);
4429 complete(&conn
->conn_logout_comp
);
4431 iscsit_cause_connection_reinstatement(conn
, sleep
);
4432 iscsit_dec_conn_usage_count(conn
);
4435 static void iscsit_logout_post_handler_diffcid(
4436 struct iscsi_conn
*conn
,
4439 struct iscsi_conn
*l_conn
;
4440 struct iscsi_session
*sess
= conn
->sess
;
4441 bool conn_found
= false;
4446 spin_lock_bh(&sess
->conn_lock
);
4447 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4448 if (l_conn
->cid
== cid
) {
4449 iscsit_inc_conn_usage_count(l_conn
);
4454 spin_unlock_bh(&sess
->conn_lock
);
4460 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4462 spin_lock_bh(&l_conn
->state_lock
);
4463 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4464 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4465 spin_unlock_bh(&l_conn
->state_lock
);
4467 iscsit_cause_connection_reinstatement(l_conn
, 1);
4468 iscsit_dec_conn_usage_count(l_conn
);
4472 * Return of 0 causes the TX thread to restart.
4474 int iscsit_logout_post_handler(
4475 struct iscsi_cmd
*cmd
,
4476 struct iscsi_conn
*conn
)
4480 switch (cmd
->logout_reason
) {
4481 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4482 switch (cmd
->logout_response
) {
4483 case ISCSI_LOGOUT_SUCCESS
:
4484 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4486 iscsit_logout_post_handler_closesession(conn
);
4491 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4492 if (conn
->cid
== cmd
->logout_cid
) {
4493 switch (cmd
->logout_response
) {
4494 case ISCSI_LOGOUT_SUCCESS
:
4495 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4497 iscsit_logout_post_handler_samecid(conn
);
4502 switch (cmd
->logout_response
) {
4503 case ISCSI_LOGOUT_SUCCESS
:
4504 iscsit_logout_post_handler_diffcid(conn
,
4507 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4508 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4515 case ISCSI_LOGOUT_REASON_RECOVERY
:
4516 switch (cmd
->logout_response
) {
4517 case ISCSI_LOGOUT_SUCCESS
:
4518 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4519 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4532 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4534 void iscsit_fail_session(struct iscsi_session
*sess
)
4536 struct iscsi_conn
*conn
;
4538 spin_lock_bh(&sess
->conn_lock
);
4539 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4540 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4541 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4543 spin_unlock_bh(&sess
->conn_lock
);
4545 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4546 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4549 int iscsit_free_session(struct iscsi_session
*sess
)
4551 u16 conn_count
= atomic_read(&sess
->nconn
);
4552 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4555 spin_lock_bh(&sess
->conn_lock
);
4556 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4558 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4560 if (conn_count
== 0)
4563 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4566 iscsit_inc_conn_usage_count(conn_tmp
);
4569 iscsit_inc_conn_usage_count(conn
);
4571 spin_unlock_bh(&sess
->conn_lock
);
4572 iscsit_cause_connection_reinstatement(conn
, 1);
4573 spin_lock_bh(&sess
->conn_lock
);
4575 iscsit_dec_conn_usage_count(conn
);
4577 iscsit_dec_conn_usage_count(conn_tmp
);
4582 if (atomic_read(&sess
->nconn
)) {
4583 spin_unlock_bh(&sess
->conn_lock
);
4584 wait_for_completion(&sess
->session_wait_comp
);
4586 spin_unlock_bh(&sess
->conn_lock
);
4588 iscsit_close_session(sess
);
4592 void iscsit_stop_session(
4593 struct iscsi_session
*sess
,
4595 int connection_sleep
)
4597 u16 conn_count
= atomic_read(&sess
->nconn
);
4598 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4601 spin_lock_bh(&sess
->conn_lock
);
4603 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4605 if (connection_sleep
) {
4606 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4608 if (conn_count
== 0)
4611 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4614 iscsit_inc_conn_usage_count(conn_tmp
);
4617 iscsit_inc_conn_usage_count(conn
);
4619 spin_unlock_bh(&sess
->conn_lock
);
4620 iscsit_cause_connection_reinstatement(conn
, 1);
4621 spin_lock_bh(&sess
->conn_lock
);
4623 iscsit_dec_conn_usage_count(conn
);
4625 iscsit_dec_conn_usage_count(conn_tmp
);
4629 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4630 iscsit_cause_connection_reinstatement(conn
, 0);
4633 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4634 spin_unlock_bh(&sess
->conn_lock
);
4635 wait_for_completion(&sess
->session_wait_comp
);
4637 spin_unlock_bh(&sess
->conn_lock
);
4640 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4642 struct iscsi_session
*sess
;
4643 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4644 struct se_session
*se_sess
, *se_sess_tmp
;
4645 LIST_HEAD(free_list
);
4646 int session_count
= 0;
4648 spin_lock_bh(&se_tpg
->session_lock
);
4649 if (tpg
->nsessions
&& !force
) {
4650 spin_unlock_bh(&se_tpg
->session_lock
);
4654 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4656 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4658 spin_lock(&sess
->conn_lock
);
4659 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4660 atomic_read(&sess
->session_logout
) ||
4661 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4662 spin_unlock(&sess
->conn_lock
);
4665 atomic_set(&sess
->session_reinstatement
, 1);
4666 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4667 spin_unlock(&sess
->conn_lock
);
4669 list_move_tail(&se_sess
->sess_list
, &free_list
);
4671 spin_unlock_bh(&se_tpg
->session_lock
);
4673 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &free_list
, sess_list
) {
4674 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4676 iscsit_free_session(sess
);
4680 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4681 " Group: %hu\n", session_count
, tpg
->tpgt
);
4685 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4686 MODULE_VERSION("4.1.x");
4687 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4688 MODULE_LICENSE("GPL");
4690 module_init(iscsi_target_init_module
);
4691 module_exit(iscsi_target_cleanup_module
);