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 * Check for underflow case where both EDTL and immediate data payload
1284 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1285 * already been set in target_cmd_size_check() as se_cmd->data_length.
1287 * For this special case, fail the command and dump the immediate data
1290 if (cmd
->first_burst_len
> cmd
->se_cmd
.data_length
) {
1291 cmd
->sense_reason
= TCM_INVALID_CDB_FIELD
;
1292 goto after_immediate_data
;
1295 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1296 cmd
->first_burst_len
);
1297 after_immediate_data
:
1298 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1300 * A PDU/CmdSN carrying Immediate Data passed
1301 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1302 * Immediate Bit is not set.
1304 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1305 (unsigned char *)hdr
, hdr
->cmdsn
);
1306 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1309 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1312 rc
= iscsit_dump_data_payload(cmd
->conn
,
1313 cmd
->first_burst_len
, 1);
1314 target_put_sess_cmd(&cmd
->se_cmd
);
1316 } else if (cmd
->unsolicited_data
)
1317 iscsit_set_unsoliticed_dataout(cmd
);
1319 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1321 * Immediate Data failed DataCRC and ERL>=1,
1322 * silently drop this PDU and let the initiator
1323 * plug the CmdSN gap.
1325 * FIXME: Send Unsolicited NOPIN with reserved
1326 * TTT here to help the initiator figure out
1327 * the missing CmdSN, although they should be
1328 * intelligent enough to determine the missing
1329 * CmdSN and issue a retry to plug the sequence.
1331 cmd
->i_state
= ISTATE_REMOVE
;
1332 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1333 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1340 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1343 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1345 bool dump_payload
= false;
1347 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1351 * Allocation iovecs needed for struct socket operations for
1352 * traditional iSCSI block I/O.
1354 if (iscsit_allocate_iovecs(cmd
) < 0) {
1355 return iscsit_reject_cmd(cmd
,
1356 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1358 immed_data
= cmd
->immediate_data
;
1360 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1364 dump_payload
= true;
1369 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1372 static u32
iscsit_do_crypto_hash_sg(
1373 struct ahash_request
*hash
,
1374 struct iscsi_cmd
*cmd
,
1381 struct scatterlist
*sg
;
1382 unsigned int page_off
;
1384 crypto_ahash_init(hash
);
1386 sg
= cmd
->first_data_sg
;
1387 page_off
= cmd
->first_data_sg_off
;
1389 while (data_length
) {
1390 u32 cur_len
= min_t(u32
, data_length
, (sg
->length
- page_off
));
1392 ahash_request_set_crypt(hash
, sg
, NULL
, cur_len
);
1393 crypto_ahash_update(hash
);
1395 data_length
-= cur_len
;
1397 /* iscsit_map_iovec has already checked for invalid sg pointers */
1402 struct scatterlist pad_sg
;
1404 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1405 ahash_request_set_crypt(hash
, &pad_sg
, (u8
*)&data_crc
,
1407 crypto_ahash_finup(hash
);
1409 ahash_request_set_crypt(hash
, NULL
, (u8
*)&data_crc
, 0);
1410 crypto_ahash_final(hash
);
1416 static void iscsit_do_crypto_hash_buf(
1417 struct ahash_request
*hash
,
1424 struct scatterlist sg
[2];
1426 sg_init_table(sg
, ARRAY_SIZE(sg
));
1427 sg_set_buf(sg
, buf
, payload_length
);
1428 sg_set_buf(sg
+ 1, pad_bytes
, padding
);
1430 ahash_request_set_crypt(hash
, sg
, data_crc
, payload_length
+ padding
);
1432 crypto_ahash_digest(hash
);
1436 __iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1437 struct iscsi_cmd
*cmd
, u32 payload_length
,
1440 struct iscsi_data
*hdr
= buf
;
1441 struct se_cmd
*se_cmd
;
1445 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1447 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1448 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1449 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1450 payload_length
, conn
->cid
);
1452 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1453 pr_err("Command ITT: 0x%08x received DataOUT after"
1454 " last DataOUT received, dumping payload\n",
1455 cmd
->init_task_tag
);
1456 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1459 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1460 pr_err("Command ITT: 0x%08x received DataOUT for a"
1461 " NON-WRITE command.\n", cmd
->init_task_tag
);
1462 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1464 se_cmd
= &cmd
->se_cmd
;
1465 iscsit_mod_dataout_timer(cmd
);
1467 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1468 pr_err("DataOut Offset: %u, Length %u greater than"
1469 " iSCSI Command EDTL %u, protocol error.\n",
1470 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1471 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1474 if (cmd
->unsolicited_data
) {
1475 int dump_unsolicited_data
= 0;
1477 if (conn
->sess
->sess_ops
->InitialR2T
) {
1478 pr_err("Received unexpected unsolicited data"
1479 " while InitialR2T=Yes, protocol error.\n");
1480 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1481 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1485 * Special case for dealing with Unsolicited DataOUT
1486 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1490 /* Something's amiss if we're not in WRITE_PENDING state... */
1491 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1492 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1493 dump_unsolicited_data
= 1;
1495 if (dump_unsolicited_data
) {
1497 * Check if a delayed TASK_ABORTED status needs to
1498 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1499 * received with the unsolicited data out.
1501 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1502 iscsit_stop_dataout_timer(cmd
);
1504 transport_check_aborted_status(se_cmd
,
1505 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1506 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1510 * For the normal solicited data path:
1512 * Check for a delayed TASK_ABORTED status and dump any
1513 * incoming data out payload if one exists. Also, when the
1514 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1515 * data out sequence, we decrement outstanding_r2ts. Once
1516 * outstanding_r2ts reaches zero, go ahead and send the delayed
1517 * TASK_ABORTED status.
1519 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1520 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1521 if (--cmd
->outstanding_r2ts
< 1) {
1522 iscsit_stop_dataout_timer(cmd
);
1523 transport_check_aborted_status(
1527 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1531 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1532 * within-command recovery checks before receiving the payload.
1534 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1535 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1537 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1542 EXPORT_SYMBOL(__iscsit_check_dataout_hdr
);
1545 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1546 struct iscsi_cmd
**out_cmd
)
1548 struct iscsi_data
*hdr
= buf
;
1549 struct iscsi_cmd
*cmd
;
1550 u32 payload_length
= ntoh24(hdr
->dlength
);
1552 bool success
= false;
1554 if (!payload_length
) {
1555 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1559 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1560 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1561 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1562 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1563 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1566 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
, payload_length
);
1570 rc
= __iscsit_check_dataout_hdr(conn
, buf
, cmd
, payload_length
, &success
);
1577 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1580 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1581 struct iscsi_data
*hdr
)
1584 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1585 u32 payload_length
= ntoh24(hdr
->dlength
);
1586 int iov_ret
, data_crc_failed
= 0;
1588 rx_size
+= payload_length
;
1589 iov
= &cmd
->iov_data
[0];
1591 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1596 iov_count
+= iov_ret
;
1598 padding
= ((-payload_length
) & 3);
1600 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1601 iov
[iov_count
++].iov_len
= padding
;
1603 pr_debug("Receiving %u padding bytes.\n", padding
);
1606 if (conn
->conn_ops
->DataDigest
) {
1607 iov
[iov_count
].iov_base
= &checksum
;
1608 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1609 rx_size
+= ISCSI_CRC_LEN
;
1612 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1614 iscsit_unmap_iovec(cmd
);
1616 if (rx_got
!= rx_size
)
1619 if (conn
->conn_ops
->DataDigest
) {
1622 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
1623 be32_to_cpu(hdr
->offset
),
1624 payload_length
, padding
,
1627 if (checksum
!= data_crc
) {
1628 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1629 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1630 " does not match computed 0x%08x\n",
1631 hdr
->itt
, hdr
->offset
, payload_length
,
1632 hdr
->datasn
, checksum
, data_crc
);
1633 data_crc_failed
= 1;
1635 pr_debug("Got CRC32C DataDigest 0x%08x for"
1636 " %u bytes of Data Out\n", checksum
,
1641 return data_crc_failed
;
1645 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1646 bool data_crc_failed
)
1648 struct iscsi_conn
*conn
= cmd
->conn
;
1651 * Increment post receive data and CRC values or perform
1652 * within-command recovery.
1654 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1655 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1657 else if (rc
== DATAOUT_SEND_R2T
) {
1658 iscsit_set_dataout_sequence_values(cmd
);
1659 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1660 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1662 * Handle extra special case for out of order
1663 * Unsolicited Data Out.
1665 spin_lock_bh(&cmd
->istate_lock
);
1666 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1667 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1668 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1669 spin_unlock_bh(&cmd
->istate_lock
);
1671 iscsit_stop_dataout_timer(cmd
);
1674 target_execute_cmd(&cmd
->se_cmd
);
1676 } else /* DATAOUT_CANNOT_RECOVER */
1681 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1683 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1685 struct iscsi_cmd
*cmd
= NULL
;
1686 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1688 bool data_crc_failed
= false;
1690 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1696 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1700 data_crc_failed
= true;
1702 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1705 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1706 struct iscsi_nopout
*hdr
)
1708 u32 payload_length
= ntoh24(hdr
->dlength
);
1710 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1711 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1713 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1714 (unsigned char *)hdr
);
1716 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1717 (unsigned char *)hdr
);
1720 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1721 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1722 " not set, protocol error.\n");
1724 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1725 (unsigned char *)hdr
);
1727 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1728 (unsigned char *)hdr
);
1731 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1732 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1733 " greater than MaxXmitDataSegmentLength: %u, protocol"
1734 " error.\n", payload_length
,
1735 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1737 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1738 (unsigned char *)hdr
);
1740 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1741 (unsigned char *)hdr
);
1744 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1745 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1746 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1747 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1750 * This is not a response to a Unsolicited NopIN, which means
1751 * it can either be a NOPOUT ping request (with a valid ITT),
1752 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1753 * Either way, make sure we allocate an struct iscsi_cmd, as both
1754 * can contain ping data.
1756 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1757 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1758 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1759 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1761 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1762 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1763 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1764 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1765 cmd
->data_direction
= DMA_NONE
;
1770 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1772 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1773 struct iscsi_nopout
*hdr
)
1775 struct iscsi_cmd
*cmd_p
= NULL
;
1778 * Initiator is expecting a NopIN ping reply..
1780 if (hdr
->itt
!= RESERVED_ITT
) {
1782 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1783 (unsigned char *)hdr
);
1785 spin_lock_bh(&conn
->cmd_lock
);
1786 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1787 spin_unlock_bh(&conn
->cmd_lock
);
1789 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1791 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1792 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1797 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1798 (unsigned char *)hdr
, hdr
->cmdsn
);
1799 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1801 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1807 * This was a response to a unsolicited NOPIN ping.
1809 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1810 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1814 iscsit_stop_nopin_response_timer(conn
);
1816 cmd_p
->i_state
= ISTATE_REMOVE
;
1817 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1819 iscsit_start_nopin_timer(conn
);
1823 * Otherwise, initiator is not expecting a NOPIN is response.
1824 * Just ignore for now.
1828 iscsit_free_cmd(cmd
, false);
1832 EXPORT_SYMBOL(iscsit_process_nop_out
);
1834 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1837 unsigned char *ping_data
= NULL
;
1838 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1839 struct kvec
*iov
= NULL
;
1840 u32 payload_length
= ntoh24(hdr
->dlength
);
1843 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1847 * Handle NOP-OUT payload for traditional iSCSI sockets
1849 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1850 u32 checksum
, data_crc
, padding
= 0;
1851 int niov
= 0, rx_got
, rx_size
= payload_length
;
1853 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1859 iov
= &cmd
->iov_misc
[0];
1860 iov
[niov
].iov_base
= ping_data
;
1861 iov
[niov
++].iov_len
= payload_length
;
1863 padding
= ((-payload_length
) & 3);
1865 pr_debug("Receiving %u additional bytes"
1866 " for padding.\n", padding
);
1867 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1868 iov
[niov
++].iov_len
= padding
;
1871 if (conn
->conn_ops
->DataDigest
) {
1872 iov
[niov
].iov_base
= &checksum
;
1873 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1874 rx_size
+= ISCSI_CRC_LEN
;
1877 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1878 if (rx_got
!= rx_size
) {
1883 if (conn
->conn_ops
->DataDigest
) {
1884 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
1885 ping_data
, payload_length
,
1886 padding
, cmd
->pad_bytes
,
1889 if (checksum
!= data_crc
) {
1890 pr_err("Ping data CRC32C DataDigest"
1891 " 0x%08x does not match computed 0x%08x\n",
1892 checksum
, data_crc
);
1893 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1894 pr_err("Unable to recover from"
1895 " NOPOUT Ping DataCRC failure while in"
1901 * Silently drop this PDU and let the
1902 * initiator plug the CmdSN gap.
1904 pr_debug("Dropping NOPOUT"
1905 " Command CmdSN: 0x%08x due to"
1906 " DataCRC error.\n", hdr
->cmdsn
);
1911 pr_debug("Got CRC32C DataDigest"
1912 " 0x%08x for %u bytes of ping data.\n",
1913 checksum
, payload_length
);
1917 ping_data
[payload_length
] = '\0';
1919 * Attach ping data to struct iscsi_cmd->buf_ptr.
1921 cmd
->buf_ptr
= ping_data
;
1922 cmd
->buf_ptr_size
= payload_length
;
1924 pr_debug("Got %u bytes of NOPOUT ping"
1925 " data.\n", payload_length
);
1926 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1929 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1932 iscsit_free_cmd(cmd
, false);
1938 static enum tcm_tmreq_table
iscsit_convert_tmf(u8 iscsi_tmf
)
1940 switch (iscsi_tmf
) {
1941 case ISCSI_TM_FUNC_ABORT_TASK
:
1942 return TMR_ABORT_TASK
;
1943 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1944 return TMR_ABORT_TASK_SET
;
1945 case ISCSI_TM_FUNC_CLEAR_ACA
:
1946 return TMR_CLEAR_ACA
;
1947 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1948 return TMR_CLEAR_TASK_SET
;
1949 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1950 return TMR_LUN_RESET
;
1951 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1952 return TMR_TARGET_WARM_RESET
;
1953 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1954 return TMR_TARGET_COLD_RESET
;
1961 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1964 struct se_tmr_req
*se_tmr
;
1965 struct iscsi_tmr_req
*tmr_req
;
1966 struct iscsi_tm
*hdr
;
1967 int out_of_order_cmdsn
= 0, ret
;
1968 bool sess_ref
= false;
1969 u8 function
, tcm_function
= TMR_UNKNOWN
;
1971 hdr
= (struct iscsi_tm
*) buf
;
1972 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1973 function
= hdr
->flags
;
1975 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1976 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1977 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1978 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1980 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1981 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1982 hdr
->rtt
!= RESERVED_ITT
)) {
1983 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1984 hdr
->rtt
= RESERVED_ITT
;
1987 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1988 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1989 pr_err("Task Management Request TASK_REASSIGN not"
1990 " issued as immediate command, bad iSCSI Initiator"
1991 "implementation\n");
1992 return iscsit_add_reject_cmd(cmd
,
1993 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1995 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1996 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1997 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1999 cmd
->data_direction
= DMA_NONE
;
2000 cmd
->tmr_req
= kzalloc(sizeof(*cmd
->tmr_req
), GFP_KERNEL
);
2002 return iscsit_add_reject_cmd(cmd
,
2003 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
2007 * TASK_REASSIGN for ERL=2 / connection stays inside of
2008 * LIO-Target $FABRIC_MOD
2010 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2011 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
2012 conn
->sess
->se_sess
, 0, DMA_NONE
,
2013 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
2015 target_get_sess_cmd(&cmd
->se_cmd
, true);
2017 tcm_function
= iscsit_convert_tmf(function
);
2018 if (tcm_function
== TMR_UNKNOWN
) {
2019 pr_err("Unknown iSCSI TMR Function:"
2020 " 0x%02x\n", function
);
2021 return iscsit_add_reject_cmd(cmd
,
2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2025 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
, tcm_function
,
2028 return iscsit_add_reject_cmd(cmd
,
2029 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2031 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
2033 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
2034 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
2035 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2036 cmd
->init_task_tag
= hdr
->itt
;
2037 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2038 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2039 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2040 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
2041 tmr_req
= cmd
->tmr_req
;
2043 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2045 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2046 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
2047 scsilun_to_int(&hdr
->lun
));
2049 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
2055 case ISCSI_TM_FUNC_ABORT_TASK
:
2056 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
2057 if (se_tmr
->response
)
2060 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
2061 case ISCSI_TM_FUNC_CLEAR_ACA
:
2062 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
2063 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
2065 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
2066 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
2067 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2071 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
2072 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
2073 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2077 case ISCSI_TM_FUNC_TASK_REASSIGN
:
2078 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
2080 * Perform sanity checks on the ExpDataSN only if the
2081 * TASK_REASSIGN was successful.
2083 if (se_tmr
->response
)
2086 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
2087 return iscsit_add_reject_cmd(cmd
,
2088 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
2091 pr_err("Unknown TMR function: 0x%02x, protocol"
2092 " error.\n", function
);
2093 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
2097 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
2098 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
2099 se_tmr
->call_transport
= 1;
2101 spin_lock_bh(&conn
->cmd_lock
);
2102 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2103 spin_unlock_bh(&conn
->cmd_lock
);
2105 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2106 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2107 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
2108 out_of_order_cmdsn
= 1;
2109 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2111 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2114 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2116 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
2119 * Found the referenced task, send to transport for processing.
2121 if (se_tmr
->call_transport
)
2122 return transport_generic_handle_tmr(&cmd
->se_cmd
);
2125 * Could not find the referenced LUN, task, or Task Management
2126 * command not authorized or supported. Change state and
2127 * let the tx_thread send the response.
2129 * For connection recovery, this is also the default action for
2130 * TMR TASK_REASSIGN.
2133 pr_debug("Handle TMR, using sess_ref=true check\n");
2134 target_put_sess_cmd(&cmd
->se_cmd
);
2137 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2140 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
2142 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2144 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2145 struct iscsi_text
*hdr
)
2147 u32 payload_length
= ntoh24(hdr
->dlength
);
2149 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
2150 pr_err("Unable to accept text parameter length: %u"
2151 "greater than MaxXmitDataSegmentLength %u.\n",
2152 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
2153 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2154 (unsigned char *)hdr
);
2157 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
2158 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
2159 pr_err("Multi sequence text commands currently not supported\n");
2160 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
2161 (unsigned char *)hdr
);
2164 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2165 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
2166 hdr
->exp_statsn
, payload_length
);
2168 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
2169 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
2170 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2171 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2172 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2173 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2174 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2175 cmd
->data_direction
= DMA_NONE
;
2176 cmd
->text_in_ptr
= NULL
;
2180 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2183 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2184 struct iscsi_text
*hdr
)
2186 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2190 cmd
->targ_xfer_tag
= be32_to_cpu(hdr
->ttt
);
2191 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF) {
2192 pr_err("Unable to locate text_in buffer for sendtargets"
2196 goto empty_sendtargets
;
2198 if (strncmp("SendTargets", text_in
, 11) != 0) {
2199 pr_err("Received Text Data that is not"
2200 " SendTargets, cannot continue.\n");
2203 text_ptr
= strchr(text_in
, '=');
2205 pr_err("No \"=\" separator found in Text Data,"
2206 " cannot continue.\n");
2209 if (!strncmp("=All", text_ptr
, 4)) {
2210 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2211 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2212 !strncmp("=eui.", text_ptr
, 5)) {
2213 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2215 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2219 spin_lock_bh(&conn
->cmd_lock
);
2220 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2221 spin_unlock_bh(&conn
->cmd_lock
);
2224 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2226 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2227 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2228 (unsigned char *)hdr
, hdr
->cmdsn
);
2229 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2235 return iscsit_execute_cmd(cmd
, 0);
2238 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2239 (unsigned char *)hdr
);
2241 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2244 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2247 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2248 char *text_in
= NULL
;
2249 u32 payload_length
= ntoh24(hdr
->dlength
);
2252 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2256 rx_size
= payload_length
;
2257 if (payload_length
) {
2258 u32 checksum
= 0, data_crc
= 0;
2259 u32 padding
= 0, pad_bytes
= 0;
2260 int niov
= 0, rx_got
;
2263 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2267 cmd
->text_in_ptr
= text_in
;
2269 memset(iov
, 0, 3 * sizeof(struct kvec
));
2270 iov
[niov
].iov_base
= text_in
;
2271 iov
[niov
++].iov_len
= payload_length
;
2273 padding
= ((-payload_length
) & 3);
2275 iov
[niov
].iov_base
= &pad_bytes
;
2276 iov
[niov
++].iov_len
= padding
;
2278 pr_debug("Receiving %u additional bytes"
2279 " for padding.\n", padding
);
2281 if (conn
->conn_ops
->DataDigest
) {
2282 iov
[niov
].iov_base
= &checksum
;
2283 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2284 rx_size
+= ISCSI_CRC_LEN
;
2287 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2288 if (rx_got
!= rx_size
)
2291 if (conn
->conn_ops
->DataDigest
) {
2292 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
2293 text_in
, payload_length
,
2294 padding
, (u8
*)&pad_bytes
,
2297 if (checksum
!= data_crc
) {
2298 pr_err("Text data CRC32C DataDigest"
2299 " 0x%08x does not match computed"
2300 " 0x%08x\n", checksum
, data_crc
);
2301 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2302 pr_err("Unable to recover from"
2303 " Text Data digest failure while in"
2308 * Silently drop this PDU and let the
2309 * initiator plug the CmdSN gap.
2311 pr_debug("Dropping Text"
2312 " Command CmdSN: 0x%08x due to"
2313 " DataCRC error.\n", hdr
->cmdsn
);
2318 pr_debug("Got CRC32C DataDigest"
2319 " 0x%08x for %u bytes of text data.\n",
2320 checksum
, payload_length
);
2323 text_in
[payload_length
- 1] = '\0';
2324 pr_debug("Successfully read %d bytes of text"
2325 " data.\n", payload_length
);
2328 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2331 kfree(cmd
->text_in_ptr
);
2332 cmd
->text_in_ptr
= NULL
;
2333 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2336 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2338 struct iscsi_conn
*conn_p
;
2339 struct iscsi_session
*sess
= conn
->sess
;
2341 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2342 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2344 atomic_set(&sess
->session_logout
, 1);
2345 atomic_set(&conn
->conn_logout_remove
, 1);
2346 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2348 iscsit_inc_conn_usage_count(conn
);
2349 iscsit_inc_session_usage_count(sess
);
2351 spin_lock_bh(&sess
->conn_lock
);
2352 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2353 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2356 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2357 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2359 spin_unlock_bh(&sess
->conn_lock
);
2361 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2366 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2368 struct iscsi_conn
*l_conn
;
2369 struct iscsi_session
*sess
= conn
->sess
;
2371 pr_debug("Received logout request CLOSECONNECTION for CID:"
2372 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2375 * A Logout Request with a CLOSECONNECTION reason code for a CID
2376 * can arrive on a connection with a differing CID.
2378 if (conn
->cid
== cmd
->logout_cid
) {
2379 spin_lock_bh(&conn
->state_lock
);
2380 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2381 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2383 atomic_set(&conn
->conn_logout_remove
, 1);
2384 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2385 iscsit_inc_conn_usage_count(conn
);
2387 spin_unlock_bh(&conn
->state_lock
);
2390 * Handle all different cid CLOSECONNECTION requests in
2391 * iscsit_logout_post_handler_diffcid() as to give enough
2392 * time for any non immediate command's CmdSN to be
2393 * acknowledged on the connection in question.
2395 * Here we simply make sure the CID is still around.
2397 l_conn
= iscsit_get_conn_from_cid(sess
,
2400 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2401 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2406 iscsit_dec_conn_usage_count(l_conn
);
2409 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2414 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2416 struct iscsi_session
*sess
= conn
->sess
;
2418 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2419 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2421 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2422 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2423 " while ERL!=2.\n");
2424 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2425 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2429 if (conn
->cid
== cmd
->logout_cid
) {
2430 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431 " with CID: %hu on CID: %hu, implementation error.\n",
2432 cmd
->logout_cid
, conn
->cid
);
2433 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2434 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2438 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2444 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2447 int cmdsn_ret
, logout_remove
= 0;
2449 struct iscsi_logout
*hdr
;
2450 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2452 hdr
= (struct iscsi_logout
*) buf
;
2453 reason_code
= (hdr
->flags
& 0x7f);
2456 spin_lock(&tiqn
->logout_stats
.lock
);
2457 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2458 tiqn
->logout_stats
.normal_logouts
++;
2460 tiqn
->logout_stats
.abnormal_logouts
++;
2461 spin_unlock(&tiqn
->logout_stats
.lock
);
2464 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2465 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2466 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2467 hdr
->cid
, conn
->cid
);
2469 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2470 pr_err("Received logout request on connection that"
2471 " is not in logged in state, ignoring request.\n");
2472 iscsit_free_cmd(cmd
, false);
2476 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2477 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2478 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2479 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2480 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2481 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2482 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2483 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2484 cmd
->logout_reason
= reason_code
;
2485 cmd
->data_direction
= DMA_NONE
;
2488 * We need to sleep in these cases (by returning 1) until the Logout
2489 * Response gets sent in the tx thread.
2491 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2492 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2493 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2496 spin_lock_bh(&conn
->cmd_lock
);
2497 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2498 spin_unlock_bh(&conn
->cmd_lock
);
2500 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2501 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2504 * Immediate commands are executed, well, immediately.
2505 * Non-Immediate Logout Commands are executed in CmdSN order.
2507 if (cmd
->immediate_cmd
) {
2508 int ret
= iscsit_execute_cmd(cmd
, 0);
2513 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2514 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2516 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2520 return logout_remove
;
2522 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2524 int iscsit_handle_snack(
2525 struct iscsi_conn
*conn
,
2528 struct iscsi_snack
*hdr
;
2530 hdr
= (struct iscsi_snack
*) buf
;
2531 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2533 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2534 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2535 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2536 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2538 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2539 pr_err("Initiator sent SNACK request while in"
2540 " ErrorRecoveryLevel=0.\n");
2541 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2545 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2546 * call from inside iscsi_send_recovery_datain_or_r2t().
2548 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2550 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2552 be32_to_cpu(hdr
->ttt
),
2553 be32_to_cpu(hdr
->begrun
),
2554 be32_to_cpu(hdr
->runlength
));
2555 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2556 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2557 be32_to_cpu(hdr
->ttt
),
2558 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2559 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2560 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2561 be32_to_cpu(hdr
->begrun
),
2562 be32_to_cpu(hdr
->runlength
));
2563 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2564 /* FIXME: Support R-Data SNACK */
2565 pr_err("R-Data SNACK Not Supported.\n");
2566 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2569 pr_err("Unknown SNACK type 0x%02x, protocol"
2570 " error.\n", hdr
->flags
& 0x0f);
2571 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2577 EXPORT_SYMBOL(iscsit_handle_snack
);
2579 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2581 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2582 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2583 wait_for_completion_interruptible_timeout(
2584 &conn
->rx_half_close_comp
,
2585 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2589 static int iscsit_handle_immediate_data(
2590 struct iscsi_cmd
*cmd
,
2591 struct iscsi_scsi_req
*hdr
,
2594 int iov_ret
, rx_got
= 0, rx_size
= 0;
2595 u32 checksum
, iov_count
= 0, padding
= 0;
2596 struct iscsi_conn
*conn
= cmd
->conn
;
2599 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2601 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2604 iov_count
= iov_ret
;
2605 iov
= &cmd
->iov_data
[0];
2607 padding
= ((-length
) & 3);
2609 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2610 iov
[iov_count
++].iov_len
= padding
;
2614 if (conn
->conn_ops
->DataDigest
) {
2615 iov
[iov_count
].iov_base
= &checksum
;
2616 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2617 rx_size
+= ISCSI_CRC_LEN
;
2620 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2622 iscsit_unmap_iovec(cmd
);
2624 if (rx_got
!= rx_size
) {
2625 iscsit_rx_thread_wait_for_tcp(conn
);
2626 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2629 if (conn
->conn_ops
->DataDigest
) {
2632 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
2633 cmd
->write_data_done
, length
, padding
,
2636 if (checksum
!= data_crc
) {
2637 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2638 " does not match computed 0x%08x\n", checksum
,
2641 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2642 pr_err("Unable to recover from"
2643 " Immediate Data digest failure while"
2645 iscsit_reject_cmd(cmd
,
2646 ISCSI_REASON_DATA_DIGEST_ERROR
,
2647 (unsigned char *)hdr
);
2648 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2650 iscsit_reject_cmd(cmd
,
2651 ISCSI_REASON_DATA_DIGEST_ERROR
,
2652 (unsigned char *)hdr
);
2653 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2656 pr_debug("Got CRC32C DataDigest 0x%08x for"
2657 " %u bytes of Immediate Data\n", checksum
,
2662 cmd
->write_data_done
+= length
;
2664 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2665 spin_lock_bh(&cmd
->istate_lock
);
2666 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2667 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2668 spin_unlock_bh(&cmd
->istate_lock
);
2671 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2675 * Called with sess->conn_lock held.
2677 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2678 with active network interface */
2679 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2681 struct iscsi_cmd
*cmd
;
2682 struct iscsi_conn
*conn_p
;
2686 * Only send a Asynchronous Message on connections whos network
2687 * interface is still functional.
2689 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2690 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2691 iscsit_inc_conn_usage_count(conn_p
);
2700 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2702 iscsit_dec_conn_usage_count(conn_p
);
2706 cmd
->logout_cid
= conn
->cid
;
2707 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2708 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2710 spin_lock_bh(&conn_p
->cmd_lock
);
2711 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2712 spin_unlock_bh(&conn_p
->cmd_lock
);
2714 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2715 iscsit_dec_conn_usage_count(conn_p
);
2718 static int iscsit_send_conn_drop_async_message(
2719 struct iscsi_cmd
*cmd
,
2720 struct iscsi_conn
*conn
)
2722 struct iscsi_async
*hdr
;
2724 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2726 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2727 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2728 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2729 cmd
->init_task_tag
= RESERVED_ITT
;
2730 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2731 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2732 cmd
->stat_sn
= conn
->stat_sn
++;
2733 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2734 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2735 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2736 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2737 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2738 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2739 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2741 pr_debug("Sending Connection Dropped Async Message StatSN:"
2742 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2743 cmd
->logout_cid
, conn
->cid
);
2745 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2748 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2750 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2751 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2752 wait_for_completion_interruptible_timeout(
2753 &conn
->tx_half_close_comp
,
2754 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2759 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2760 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2763 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2764 hdr
->flags
= datain
->flags
;
2765 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2766 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2767 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2768 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2769 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2770 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2771 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2774 hton24(hdr
->dlength
, datain
->length
);
2775 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2776 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2777 (struct scsi_lun
*)&hdr
->lun
);
2779 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2781 hdr
->itt
= cmd
->init_task_tag
;
2783 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2784 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2786 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2788 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2790 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2792 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2793 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2794 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2795 hdr
->offset
= cpu_to_be32(datain
->offset
);
2797 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2798 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2799 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2800 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2802 EXPORT_SYMBOL(iscsit_build_datain_pdu
);
2804 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2806 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2807 struct iscsi_datain datain
;
2808 struct iscsi_datain_req
*dr
;
2810 bool set_statsn
= false;
2812 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2813 dr
= iscsit_get_datain_values(cmd
, &datain
);
2815 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2816 cmd
->init_task_tag
);
2820 * Be paranoid and double check the logic for now.
2822 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2823 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2824 " datain.length: %u exceeds cmd->data_length: %u\n",
2825 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2826 cmd
->se_cmd
.data_length
);
2830 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2832 * Special case for successfully execution w/ both DATAIN
2835 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2836 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2837 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2839 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2840 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2841 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2842 cmd
->stat_sn
= conn
->stat_sn
++;
2844 } else if (dr
->dr_complete
==
2845 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2849 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2851 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, dr
, &datain
, 0);
2855 if (dr
->dr_complete
) {
2856 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2858 iscsit_free_datain_req(cmd
, dr
);
2865 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2866 struct iscsi_logout_rsp
*hdr
)
2868 struct iscsi_conn
*logout_conn
= NULL
;
2869 struct iscsi_conn_recovery
*cr
= NULL
;
2870 struct iscsi_session
*sess
= conn
->sess
;
2872 * The actual shutting down of Sessions and/or Connections
2873 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2874 * is done in scsi_logout_post_handler().
2876 switch (cmd
->logout_reason
) {
2877 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2878 pr_debug("iSCSI session logout successful, setting"
2879 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2880 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2882 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2883 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2886 * For CLOSECONNECTION logout requests carrying
2887 * a matching logout CID -> local CID, the reference
2888 * for the local CID will have been incremented in
2889 * iscsi_logout_closeconnection().
2891 * For CLOSECONNECTION logout requests carrying
2892 * a different CID than the connection it arrived
2893 * on, the connection responding to cmd->logout_cid
2894 * is stopped in iscsit_logout_post_handler_diffcid().
2897 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2898 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2899 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2901 case ISCSI_LOGOUT_REASON_RECOVERY
:
2902 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2903 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2906 * If the connection is still active from our point of view
2907 * force connection recovery to occur.
2909 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2912 iscsit_connection_reinstatement_rcfr(logout_conn
);
2913 iscsit_dec_conn_usage_count(logout_conn
);
2916 cr
= iscsit_get_inactive_connection_recovery_entry(
2917 conn
->sess
, cmd
->logout_cid
);
2919 pr_err("Unable to locate CID: %hu for"
2920 " REMOVECONNFORRECOVERY Logout Request.\n",
2922 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2926 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2928 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2929 " for recovery for CID: %hu on CID: %hu successful.\n",
2930 cmd
->logout_cid
, conn
->cid
);
2931 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2934 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2935 cmd
->logout_reason
);
2939 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2940 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2941 hdr
->response
= cmd
->logout_response
;
2942 hdr
->itt
= cmd
->init_task_tag
;
2943 cmd
->stat_sn
= conn
->stat_sn
++;
2944 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2946 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2947 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2948 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2950 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2951 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2952 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2953 cmd
->logout_cid
, conn
->cid
);
2957 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2960 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2964 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2965 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2969 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2973 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2974 struct iscsi_nopin
*hdr
, bool nopout_response
)
2976 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2977 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2978 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2979 if (nopout_response
)
2980 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2981 hdr
->itt
= cmd
->init_task_tag
;
2982 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2983 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2985 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2987 if (nopout_response
)
2988 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2990 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2991 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2993 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2994 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2995 "Solicited" : "Unsolicited", cmd
->init_task_tag
,
2996 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2998 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
3001 * Unsolicited NOPIN, either requesting a response or not.
3003 static int iscsit_send_unsolicited_nopin(
3004 struct iscsi_cmd
*cmd
,
3005 struct iscsi_conn
*conn
,
3008 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3011 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
3013 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3014 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
3016 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3020 spin_lock_bh(&cmd
->istate_lock
);
3021 cmd
->i_state
= want_response
?
3022 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
3023 spin_unlock_bh(&cmd
->istate_lock
);
3029 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3031 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3033 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
3036 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3037 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3039 pr_debug("Echoing back %u bytes of ping data.\n", cmd
->buf_ptr_size
);
3041 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3046 static int iscsit_send_r2t(
3047 struct iscsi_cmd
*cmd
,
3048 struct iscsi_conn
*conn
)
3050 struct iscsi_r2t
*r2t
;
3051 struct iscsi_r2t_rsp
*hdr
;
3054 r2t
= iscsit_get_r2t_from_list(cmd
);
3058 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3059 memset(hdr
, 0, ISCSI_HDR_LEN
);
3060 hdr
->opcode
= ISCSI_OP_R2T
;
3061 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3062 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3063 (struct scsi_lun
*)&hdr
->lun
);
3064 hdr
->itt
= cmd
->init_task_tag
;
3065 if (conn
->conn_transport
->iscsit_get_r2t_ttt
)
3066 conn
->conn_transport
->iscsit_get_r2t_ttt(conn
, cmd
, r2t
);
3068 r2t
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3069 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3070 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3071 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3072 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3073 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3074 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3075 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3080 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3081 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3083 spin_lock_bh(&cmd
->r2t_lock
);
3085 spin_unlock_bh(&cmd
->r2t_lock
);
3087 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3092 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3093 iscsit_start_dataout_timer(cmd
, conn
);
3094 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3100 * @recovery: If called from iscsi_task_reassign_complete_write() for
3101 * connection recovery.
3103 int iscsit_build_r2ts_for_cmd(
3104 struct iscsi_conn
*conn
,
3105 struct iscsi_cmd
*cmd
,
3109 u32 offset
= 0, xfer_len
= 0;
3111 spin_lock_bh(&cmd
->r2t_lock
);
3112 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3113 spin_unlock_bh(&cmd
->r2t_lock
);
3117 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3119 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3121 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3122 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3123 offset
= cmd
->r2t_offset
;
3125 if (first_r2t
&& recovery
) {
3126 int new_data_end
= offset
+
3127 conn
->sess
->sess_ops
->MaxBurstLength
-
3128 cmd
->next_burst_len
;
3130 if (new_data_end
> cmd
->se_cmd
.data_length
)
3131 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3134 conn
->sess
->sess_ops
->MaxBurstLength
-
3135 cmd
->next_burst_len
;
3137 int new_data_end
= offset
+
3138 conn
->sess
->sess_ops
->MaxBurstLength
;
3140 if (new_data_end
> cmd
->se_cmd
.data_length
)
3141 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3143 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3145 cmd
->r2t_offset
+= xfer_len
;
3147 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3148 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3150 struct iscsi_seq
*seq
;
3152 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3154 spin_unlock_bh(&cmd
->r2t_lock
);
3158 offset
= seq
->offset
;
3159 xfer_len
= seq
->xfer_len
;
3161 if (cmd
->seq_send_order
== cmd
->seq_count
)
3162 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3164 cmd
->outstanding_r2ts
++;
3167 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3168 spin_unlock_bh(&cmd
->r2t_lock
);
3172 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3175 spin_unlock_bh(&cmd
->r2t_lock
);
3179 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd
);
3181 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3182 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3185 cmd
->stat_sn
= conn
->stat_sn
++;
3187 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3189 memset(hdr
, 0, ISCSI_HDR_LEN
);
3190 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3191 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3192 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3193 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3194 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3195 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3196 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3197 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3199 hdr
->response
= cmd
->iscsi_response
;
3200 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3201 hdr
->itt
= cmd
->init_task_tag
;
3202 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3204 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3205 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3206 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3208 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3209 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3210 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3211 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3213 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3215 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3217 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3218 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3219 void *data_buf
= NULL
;
3220 u32 padding
= 0, data_buf_len
= 0;
3222 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3225 * Attach SENSE DATA payload to iSCSI Response PDU
3227 if (cmd
->se_cmd
.sense_buffer
&&
3228 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3229 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3230 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3231 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3233 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3234 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3235 data_buf
= cmd
->sense_buffer
;
3236 data_buf_len
= cmd
->se_cmd
.scsi_sense_length
+ padding
;
3239 memset(cmd
->sense_buffer
+
3240 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3241 pr_debug("Adding %u bytes of padding to"
3242 " SENSE.\n", padding
);
3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3247 cmd
->se_cmd
.scsi_sense_length
);
3250 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, data_buf
,
3254 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3256 switch (se_tmr
->response
) {
3257 case TMR_FUNCTION_COMPLETE
:
3258 return ISCSI_TMF_RSP_COMPLETE
;
3259 case TMR_TASK_DOES_NOT_EXIST
:
3260 return ISCSI_TMF_RSP_NO_TASK
;
3261 case TMR_LUN_DOES_NOT_EXIST
:
3262 return ISCSI_TMF_RSP_NO_LUN
;
3263 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3264 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3265 case TMR_FUNCTION_REJECTED
:
3267 return ISCSI_TMF_RSP_REJECTED
;
3272 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3273 struct iscsi_tm_rsp
*hdr
)
3275 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3277 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3278 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3279 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3280 hdr
->itt
= cmd
->init_task_tag
;
3281 cmd
->stat_sn
= conn
->stat_sn
++;
3282 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3284 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3285 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3286 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3288 pr_debug("Built Task Management Response ITT: 0x%08x,"
3289 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3290 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3292 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3295 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3297 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3299 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3301 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3304 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3308 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3309 const struct sockaddr_in6 sin6
= {
3310 .sin6_addr
= IN6ADDR_ANY_INIT
};
3311 struct sockaddr_in6
*sock_in6
=
3312 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3314 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3315 sin6
.sin6_addr
.s6_addr
, 16))
3318 struct sockaddr_in
* sock_in
=
3319 (struct sockaddr_in
*)&np
->np_sockaddr
;
3321 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3328 #define SENDTARGETS_BUF_LIMIT 32768U
3331 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3332 enum iscsit_transport_type network_transport
,
3333 int skip_bytes
, bool *completed
)
3335 char *payload
= NULL
;
3336 struct iscsi_conn
*conn
= cmd
->conn
;
3337 struct iscsi_portal_group
*tpg
;
3338 struct iscsi_tiqn
*tiqn
;
3339 struct iscsi_tpg_np
*tpg_np
;
3340 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3341 int target_name_printed
;
3342 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3343 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3346 buffer_len
= min(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3347 SENDTARGETS_BUF_LIMIT
);
3349 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3354 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3357 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3358 text_ptr
= strchr(text_in
, '=');
3360 pr_err("Unable to locate '=' string in text_in:"
3366 * Skip over '=' character..
3371 spin_lock(&tiqn_lock
);
3372 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3373 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3374 strcmp(tiqn
->tiqn
, text_ptr
)) {
3378 target_name_printed
= 0;
3380 spin_lock(&tiqn
->tiqn_tpg_lock
);
3381 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3383 /* If demo_mode_discovery=0 and generate_node_acls=0
3384 * (demo mode dislabed) do not return
3385 * TargetName+TargetAddress unless a NodeACL exists.
3388 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3389 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3390 (!target_tpg_has_node_acl(&tpg
->tpg_se_tpg
,
3391 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3395 spin_lock(&tpg
->tpg_state_lock
);
3396 active
= (tpg
->tpg_state
== TPG_STATE_ACTIVE
);
3397 spin_unlock(&tpg
->tpg_state_lock
);
3399 if (!active
&& tpg
->tpg_attrib
.tpg_enabled_sendtargets
)
3402 spin_lock(&tpg
->tpg_np_lock
);
3403 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3405 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3406 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3407 struct sockaddr_storage
*sockaddr
;
3409 if (np
->np_network_transport
!= network_transport
)
3412 if (!target_name_printed
) {
3413 len
= sprintf(buf
, "TargetName=%s",
3417 if ((len
+ payload_len
) > buffer_len
) {
3418 spin_unlock(&tpg
->tpg_np_lock
);
3419 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3424 if (skip_bytes
&& len
<= skip_bytes
) {
3427 memcpy(payload
+ payload_len
, buf
, len
);
3429 target_name_printed
= 1;
3430 if (len
> skip_bytes
)
3436 sockaddr
= &conn
->local_sockaddr
;
3438 sockaddr
= &np
->np_sockaddr
;
3440 len
= sprintf(buf
, "TargetAddress="
3446 if ((len
+ payload_len
) > buffer_len
) {
3447 spin_unlock(&tpg
->tpg_np_lock
);
3448 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3453 if (skip_bytes
&& len
<= skip_bytes
) {
3456 memcpy(payload
+ payload_len
, buf
, len
);
3458 if (len
> skip_bytes
)
3462 spin_unlock(&tpg
->tpg_np_lock
);
3464 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3471 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3474 spin_unlock(&tiqn_lock
);
3476 cmd
->buf_ptr
= payload
;
3482 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3483 struct iscsi_text_rsp
*hdr
,
3484 enum iscsit_transport_type network_transport
)
3486 int text_length
, padding
;
3487 bool completed
= true;
3489 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
,
3490 cmd
->read_data_done
,
3492 if (text_length
< 0)
3496 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3498 hdr
->flags
|= ISCSI_FLAG_TEXT_CONTINUE
;
3499 cmd
->read_data_done
+= text_length
;
3500 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
3501 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3503 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3504 padding
= ((-text_length
) & 3);
3505 hton24(hdr
->dlength
, text_length
);
3506 hdr
->itt
= cmd
->init_task_tag
;
3507 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3508 cmd
->stat_sn
= conn
->stat_sn
++;
3509 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3511 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3513 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3514 * correctly increment MaxCmdSN for each response answering a
3515 * non immediate text request with a valid CmdSN.
3517 cmd
->maxcmdsn_inc
= 0;
3518 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3519 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3521 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3522 " Length: %u, CID: %hu F: %d C: %d\n", cmd
->init_task_tag
,
3523 cmd
->targ_xfer_tag
, cmd
->stat_sn
, text_length
, conn
->cid
,
3524 !!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
),
3525 !!(hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
));
3527 return text_length
+ padding
;
3529 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3531 static int iscsit_send_text_rsp(
3532 struct iscsi_cmd
*cmd
,
3533 struct iscsi_conn
*conn
)
3535 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3538 text_length
= iscsit_build_text_rsp(cmd
, conn
, hdr
,
3539 conn
->conn_transport
->transport_type
);
3540 if (text_length
< 0)
3543 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3549 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3550 struct iscsi_reject
*hdr
)
3552 hdr
->opcode
= ISCSI_OP_REJECT
;
3553 hdr
->reason
= cmd
->reject_reason
;
3554 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3555 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3556 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3557 cmd
->stat_sn
= conn
->stat_sn
++;
3558 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3559 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3560 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3563 EXPORT_SYMBOL(iscsit_build_reject
);
3565 static int iscsit_send_reject(
3566 struct iscsi_cmd
*cmd
,
3567 struct iscsi_conn
*conn
)
3569 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3571 iscsit_build_reject(cmd
, conn
, hdr
);
3573 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3574 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3576 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3581 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3585 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3586 * within iscsit_start_kthreads()
3588 * Here we use bitmap_id to determine which CPU that this
3589 * iSCSI connection's RX/TX threads will be scheduled to
3592 ord
= conn
->bitmap_id
% cpumask_weight(cpu_online_mask
);
3593 for_each_online_cpu(cpu
) {
3595 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3600 * This should never be reached..
3603 cpumask_setall(conn
->conn_cpumask
);
3607 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3612 case ISTATE_SEND_R2T
:
3613 ret
= iscsit_send_r2t(cmd
, conn
);
3618 spin_lock_bh(&conn
->cmd_lock
);
3619 list_del_init(&cmd
->i_conn_node
);
3620 spin_unlock_bh(&conn
->cmd_lock
);
3622 iscsit_free_cmd(cmd
, false);
3624 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3625 iscsit_mod_nopin_response_timer(conn
);
3626 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3630 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3631 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3636 pr_err("Unknown Opcode: 0x%02x ITT:"
3637 " 0x%08x, i_state: %d on CID: %hu\n",
3638 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3648 EXPORT_SYMBOL(iscsit_immediate_queue
);
3651 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3653 struct iscsit_transport
*t
= conn
->conn_transport
;
3654 struct iscsi_queue_req
*qr
;
3655 struct iscsi_cmd
*cmd
;
3659 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3660 atomic_set(&conn
->check_immediate_queue
, 0);
3663 kmem_cache_free(lio_qr_cache
, qr
);
3665 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3674 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3680 case ISTATE_SEND_DATAIN
:
3681 ret
= iscsit_send_datain(cmd
, conn
);
3686 goto check_rsp_state
;
3687 else if (ret
== 1) {
3689 spin_lock_bh(&cmd
->istate_lock
);
3690 cmd
->i_state
= ISTATE_SENT_STATUS
;
3691 spin_unlock_bh(&cmd
->istate_lock
);
3693 if (atomic_read(&conn
->check_immediate_queue
))
3697 } else if (ret
== 2) {
3698 /* Still must send status,
3699 SCF_TRANSPORT_TASK_SENSE was set */
3700 spin_lock_bh(&cmd
->istate_lock
);
3701 cmd
->i_state
= ISTATE_SEND_STATUS
;
3702 spin_unlock_bh(&cmd
->istate_lock
);
3703 state
= ISTATE_SEND_STATUS
;
3704 goto check_rsp_state
;
3708 case ISTATE_SEND_STATUS
:
3709 case ISTATE_SEND_STATUS_RECOVERY
:
3710 ret
= iscsit_send_response(cmd
, conn
);
3712 case ISTATE_SEND_LOGOUTRSP
:
3713 ret
= iscsit_send_logout(cmd
, conn
);
3715 case ISTATE_SEND_ASYNCMSG
:
3716 ret
= iscsit_send_conn_drop_async_message(
3719 case ISTATE_SEND_NOPIN
:
3720 ret
= iscsit_send_nopin(cmd
, conn
);
3722 case ISTATE_SEND_REJECT
:
3723 ret
= iscsit_send_reject(cmd
, conn
);
3725 case ISTATE_SEND_TASKMGTRSP
:
3726 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3729 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3731 iscsit_fall_back_to_erl0(conn
->sess
);
3733 case ISTATE_SEND_TEXTRSP
:
3734 ret
= iscsit_send_text_rsp(cmd
, conn
);
3737 pr_err("Unknown Opcode: 0x%02x ITT:"
3738 " 0x%08x, i_state: %d on CID: %hu\n",
3739 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3747 case ISTATE_SEND_LOGOUTRSP
:
3748 if (!iscsit_logout_post_handler(cmd
, conn
))
3751 case ISTATE_SEND_STATUS
:
3752 case ISTATE_SEND_ASYNCMSG
:
3753 case ISTATE_SEND_NOPIN
:
3754 case ISTATE_SEND_STATUS_RECOVERY
:
3755 case ISTATE_SEND_TEXTRSP
:
3756 case ISTATE_SEND_TASKMGTRSP
:
3757 case ISTATE_SEND_REJECT
:
3758 spin_lock_bh(&cmd
->istate_lock
);
3759 cmd
->i_state
= ISTATE_SENT_STATUS
;
3760 spin_unlock_bh(&cmd
->istate_lock
);
3763 pr_err("Unknown Opcode: 0x%02x ITT:"
3764 " 0x%08x, i_state: %d on CID: %hu\n",
3765 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3766 cmd
->i_state
, conn
->cid
);
3770 if (atomic_read(&conn
->check_immediate_queue
))
3778 EXPORT_SYMBOL(iscsit_response_queue
);
3780 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3782 struct iscsit_transport
*t
= conn
->conn_transport
;
3783 struct iscsi_queue_req
*qr
;
3784 struct iscsi_cmd
*cmd
;
3788 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3791 kmem_cache_free(lio_qr_cache
, qr
);
3793 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3794 if (ret
== 1 || ret
< 0)
3801 int iscsi_target_tx_thread(void *arg
)
3804 struct iscsi_conn
*conn
= arg
;
3805 bool conn_freed
= false;
3808 * Allow ourselves to be interrupted by SIGINT so that a
3809 * connection recovery / failure event can be triggered externally.
3811 allow_signal(SIGINT
);
3813 while (!kthread_should_stop()) {
3815 * Ensure that both TX and RX per connection kthreads
3816 * are scheduled to run on the same CPU.
3818 iscsit_thread_check_cpumask(conn
, current
, 1);
3820 wait_event_interruptible(conn
->queues_wq
,
3821 !iscsit_conn_all_queues_empty(conn
));
3823 if (signal_pending(current
))
3827 ret
= iscsit_handle_immediate_queue(conn
);
3831 ret
= iscsit_handle_response_queue(conn
);
3834 } else if (ret
== -ECONNRESET
) {
3837 } else if (ret
< 0) {
3844 * Avoid the normal connection failure code-path if this connection
3845 * is still within LOGIN mode, and iscsi_np process context is
3846 * responsible for cleaning up the early connection failure.
3848 if (conn
->conn_state
!= TARG_CONN_STATE_IN_LOGIN
)
3849 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
3852 while (!kthread_should_stop()) {
3859 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
3861 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
3862 struct iscsi_cmd
*cmd
;
3865 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
3866 case ISCSI_OP_SCSI_CMD
:
3867 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3871 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
3873 case ISCSI_OP_SCSI_DATA_OUT
:
3874 ret
= iscsit_handle_data_out(conn
, buf
);
3876 case ISCSI_OP_NOOP_OUT
:
3878 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
3879 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3883 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
3885 case ISCSI_OP_SCSI_TMFUNC
:
3886 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3890 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
3893 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
3894 cmd
= iscsit_find_cmd_from_itt(conn
, hdr
->itt
);
3898 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3903 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
3905 case ISCSI_OP_LOGOUT
:
3906 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3910 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
3912 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3913 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3915 case ISCSI_OP_SNACK
:
3916 ret
= iscsit_handle_snack(conn
, buf
);
3919 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
3920 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3921 pr_err("Cannot recover from unknown"
3922 " opcode while ERL=0, closing iSCSI connection.\n");
3925 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3926 " closing iSCSI connection.\n");
3933 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
3936 static bool iscsi_target_check_conn_state(struct iscsi_conn
*conn
)
3940 spin_lock_bh(&conn
->state_lock
);
3941 ret
= (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
);
3942 spin_unlock_bh(&conn
->state_lock
);
3947 static void iscsit_get_rx_pdu(struct iscsi_conn
*conn
)
3950 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3951 u32 checksum
= 0, digest
= 0;
3954 while (!kthread_should_stop()) {
3956 * Ensure that both TX and RX per connection kthreads
3957 * are scheduled to run on the same CPU.
3959 iscsit_thread_check_cpumask(conn
, current
, 0);
3961 memset(buffer
, 0, ISCSI_HDR_LEN
);
3962 memset(&iov
, 0, sizeof(struct kvec
));
3964 iov
.iov_base
= buffer
;
3965 iov
.iov_len
= ISCSI_HDR_LEN
;
3967 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3968 if (ret
!= ISCSI_HDR_LEN
) {
3969 iscsit_rx_thread_wait_for_tcp(conn
);
3973 if (conn
->conn_ops
->HeaderDigest
) {
3974 iov
.iov_base
= &digest
;
3975 iov
.iov_len
= ISCSI_CRC_LEN
;
3977 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3978 if (ret
!= ISCSI_CRC_LEN
) {
3979 iscsit_rx_thread_wait_for_tcp(conn
);
3983 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
3984 buffer
, ISCSI_HDR_LEN
,
3985 0, NULL
, (u8
*)&checksum
);
3987 if (digest
!= checksum
) {
3988 pr_err("HeaderDigest CRC32C failed,"
3989 " received 0x%08x, computed 0x%08x\n",
3992 * Set the PDU to 0xff so it will intentionally
3993 * hit default in the switch below.
3995 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3996 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
3998 pr_debug("Got HeaderDigest CRC32C"
3999 " 0x%08x\n", checksum
);
4003 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
4006 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
4008 if (conn
->sess
->sess_ops
->SessionType
&&
4009 ((!(opcode
& ISCSI_OP_TEXT
)) ||
4010 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
4011 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4012 " while in Discovery Session, rejecting.\n", opcode
);
4013 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
4018 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4024 int iscsi_target_rx_thread(void *arg
)
4027 struct iscsi_conn
*conn
= arg
;
4028 bool conn_freed
= false;
4031 * Allow ourselves to be interrupted by SIGINT so that a
4032 * connection recovery / failure event can be triggered externally.
4034 allow_signal(SIGINT
);
4036 * Wait for iscsi_post_login_handler() to complete before allowing
4037 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4039 rc
= wait_for_completion_interruptible(&conn
->rx_login_comp
);
4040 if (rc
< 0 || iscsi_target_check_conn_state(conn
))
4043 if (!conn
->conn_transport
->iscsit_get_rx_pdu
)
4046 conn
->conn_transport
->iscsit_get_rx_pdu(conn
);
4048 if (!signal_pending(current
))
4049 atomic_set(&conn
->transport_failed
, 1);
4050 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
4054 while (!kthread_should_stop()) {
4062 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4064 LIST_HEAD(tmp_list
);
4065 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4066 struct iscsi_session
*sess
= conn
->sess
;
4068 * We expect this function to only ever be called from either RX or TX
4069 * thread context via iscsit_close_connection() once the other context
4070 * has been reset -> returned sleeping pre-handler state.
4072 spin_lock_bh(&conn
->cmd_lock
);
4073 list_splice_init(&conn
->conn_cmd_list
, &tmp_list
);
4075 list_for_each_entry(cmd
, &tmp_list
, i_conn_node
) {
4076 struct se_cmd
*se_cmd
= &cmd
->se_cmd
;
4078 if (se_cmd
->se_tfo
!= NULL
) {
4079 spin_lock(&se_cmd
->t_state_lock
);
4080 se_cmd
->transport_state
|= CMD_T_FABRIC_STOP
;
4081 spin_unlock(&se_cmd
->t_state_lock
);
4084 spin_unlock_bh(&conn
->cmd_lock
);
4086 list_for_each_entry_safe(cmd
, cmd_tmp
, &tmp_list
, i_conn_node
) {
4087 list_del_init(&cmd
->i_conn_node
);
4089 iscsit_increment_maxcmdsn(cmd
, sess
);
4090 iscsit_free_cmd(cmd
, true);
4095 static void iscsit_stop_timers_for_cmds(
4096 struct iscsi_conn
*conn
)
4098 struct iscsi_cmd
*cmd
;
4100 spin_lock_bh(&conn
->cmd_lock
);
4101 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4102 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4103 iscsit_stop_dataout_timer(cmd
);
4105 spin_unlock_bh(&conn
->cmd_lock
);
4108 int iscsit_close_connection(
4109 struct iscsi_conn
*conn
)
4111 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4112 struct iscsi_session
*sess
= conn
->sess
;
4114 pr_debug("Closing iSCSI connection CID %hu on SID:"
4115 " %u\n", conn
->cid
, sess
->sid
);
4117 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4118 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4119 * sleeping and the logout response never got sent because the
4120 * connection failed.
4122 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4123 * to signal logout response TX interrupt completion. Go ahead and skip
4124 * this for iser since isert_rx_opcode() does not wait on logout failure,
4125 * and to avoid iscsi_conn pointer dereference in iser-target code.
4127 if (!conn
->conn_transport
->rdma_shutdown
)
4128 complete(&conn
->conn_logout_comp
);
4130 if (!strcmp(current
->comm
, ISCSI_RX_THREAD_NAME
)) {
4131 if (conn
->tx_thread
&&
4132 cmpxchg(&conn
->tx_thread_active
, true, false)) {
4133 send_sig(SIGINT
, conn
->tx_thread
, 1);
4134 kthread_stop(conn
->tx_thread
);
4136 } else if (!strcmp(current
->comm
, ISCSI_TX_THREAD_NAME
)) {
4137 if (conn
->rx_thread
&&
4138 cmpxchg(&conn
->rx_thread_active
, true, false)) {
4139 send_sig(SIGINT
, conn
->rx_thread
, 1);
4140 kthread_stop(conn
->rx_thread
);
4144 spin_lock(&iscsit_global
->ts_bitmap_lock
);
4145 bitmap_release_region(iscsit_global
->ts_bitmap
, conn
->bitmap_id
,
4147 spin_unlock(&iscsit_global
->ts_bitmap_lock
);
4149 iscsit_stop_timers_for_cmds(conn
);
4150 iscsit_stop_nopin_response_timer(conn
);
4151 iscsit_stop_nopin_timer(conn
);
4153 if (conn
->conn_transport
->iscsit_wait_conn
)
4154 conn
->conn_transport
->iscsit_wait_conn(conn
);
4157 * During Connection recovery drop unacknowledged out of order
4158 * commands for this connection, and prepare the other commands
4161 * During normal operation clear the out of order commands (but
4162 * do not free the struct iscsi_ooo_cmdsn's) and release all
4163 * struct iscsi_cmds.
4165 if (atomic_read(&conn
->connection_recovery
)) {
4166 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4167 iscsit_prepare_cmds_for_reallegiance(conn
);
4169 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4170 iscsit_release_commands_from_conn(conn
);
4172 iscsit_free_queue_reqs_for_conn(conn
);
4175 * Handle decrementing session or connection usage count if
4176 * a logout response was not able to be sent because the
4177 * connection failed. Fall back to Session Recovery here.
4179 if (atomic_read(&conn
->conn_logout_remove
)) {
4180 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4181 iscsit_dec_conn_usage_count(conn
);
4182 iscsit_dec_session_usage_count(sess
);
4184 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4185 iscsit_dec_conn_usage_count(conn
);
4187 atomic_set(&conn
->conn_logout_remove
, 0);
4188 atomic_set(&sess
->session_reinstatement
, 0);
4189 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4192 spin_lock_bh(&sess
->conn_lock
);
4193 list_del(&conn
->conn_list
);
4196 * Attempt to let the Initiator know this connection failed by
4197 * sending an Connection Dropped Async Message on another
4198 * active connection.
4200 if (atomic_read(&conn
->connection_recovery
))
4201 iscsit_build_conn_drop_async_message(conn
);
4203 spin_unlock_bh(&sess
->conn_lock
);
4206 * If connection reinstatement is being performed on this connection,
4207 * up the connection reinstatement semaphore that is being blocked on
4208 * in iscsit_cause_connection_reinstatement().
4210 spin_lock_bh(&conn
->state_lock
);
4211 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4212 spin_unlock_bh(&conn
->state_lock
);
4213 complete(&conn
->conn_wait_comp
);
4214 wait_for_completion(&conn
->conn_post_wait_comp
);
4215 spin_lock_bh(&conn
->state_lock
);
4219 * If connection reinstatement is being performed on this connection
4220 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4221 * connection wait rcfr semaphore that is being blocked on
4222 * an iscsit_connection_reinstatement_rcfr().
4224 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4225 spin_unlock_bh(&conn
->state_lock
);
4226 complete(&conn
->conn_wait_rcfr_comp
);
4227 wait_for_completion(&conn
->conn_post_wait_comp
);
4228 spin_lock_bh(&conn
->state_lock
);
4230 atomic_set(&conn
->connection_reinstatement
, 1);
4231 spin_unlock_bh(&conn
->state_lock
);
4234 * If any other processes are accessing this connection pointer we
4235 * must wait until they have completed.
4237 iscsit_check_conn_usage_count(conn
);
4239 ahash_request_free(conn
->conn_tx_hash
);
4240 if (conn
->conn_rx_hash
) {
4241 struct crypto_ahash
*tfm
;
4243 tfm
= crypto_ahash_reqtfm(conn
->conn_rx_hash
);
4244 ahash_request_free(conn
->conn_rx_hash
);
4245 crypto_free_ahash(tfm
);
4248 free_cpumask_var(conn
->conn_cpumask
);
4250 kfree(conn
->conn_ops
);
4251 conn
->conn_ops
= NULL
;
4254 sock_release(conn
->sock
);
4256 if (conn
->conn_transport
->iscsit_free_conn
)
4257 conn
->conn_transport
->iscsit_free_conn(conn
);
4259 iscsit_put_transport(conn
->conn_transport
);
4261 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4262 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4265 spin_lock_bh(&sess
->conn_lock
);
4266 atomic_dec(&sess
->nconn
);
4267 pr_debug("Decremented iSCSI connection count to %hu from node:"
4268 " %s\n", atomic_read(&sess
->nconn
),
4269 sess
->sess_ops
->InitiatorName
);
4271 * Make sure that if one connection fails in an non ERL=2 iSCSI
4272 * Session that they all fail.
4274 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4275 !atomic_read(&sess
->session_logout
))
4276 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4279 * If this was not the last connection in the session, and we are
4280 * performing session reinstatement or falling back to ERL=0, call
4281 * iscsit_stop_session() without sleeping to shutdown the other
4282 * active connections.
4284 if (atomic_read(&sess
->nconn
)) {
4285 if (!atomic_read(&sess
->session_reinstatement
) &&
4286 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4287 spin_unlock_bh(&sess
->conn_lock
);
4290 if (!atomic_read(&sess
->session_stop_active
)) {
4291 atomic_set(&sess
->session_stop_active
, 1);
4292 spin_unlock_bh(&sess
->conn_lock
);
4293 iscsit_stop_session(sess
, 0, 0);
4296 spin_unlock_bh(&sess
->conn_lock
);
4301 * If this was the last connection in the session and one of the
4302 * following is occurring:
4304 * Session Reinstatement is not being performed, and are falling back
4305 * to ERL=0 call iscsit_close_session().
4307 * Session Logout was requested. iscsit_close_session() will be called
4310 * Session Continuation is not being performed, start the Time2Retain
4311 * handler and check if sleep_on_sess_wait_sem is active.
4313 if (!atomic_read(&sess
->session_reinstatement
) &&
4314 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4315 spin_unlock_bh(&sess
->conn_lock
);
4316 iscsit_close_session(sess
);
4319 } else if (atomic_read(&sess
->session_logout
)) {
4320 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4321 sess
->session_state
= TARG_SESS_STATE_FREE
;
4322 spin_unlock_bh(&sess
->conn_lock
);
4324 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4325 complete(&sess
->session_wait_comp
);
4329 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4330 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4332 if (!atomic_read(&sess
->session_continuation
)) {
4333 spin_unlock_bh(&sess
->conn_lock
);
4334 iscsit_start_time2retain_handler(sess
);
4336 spin_unlock_bh(&sess
->conn_lock
);
4338 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4339 complete(&sess
->session_wait_comp
);
4346 * If the iSCSI Session for the iSCSI Initiator Node exists,
4347 * forcefully shutdown the iSCSI NEXUS.
4349 int iscsit_close_session(struct iscsi_session
*sess
)
4351 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4352 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4354 if (atomic_read(&sess
->nconn
)) {
4355 pr_err("%d connection(s) still exist for iSCSI session"
4356 " to %s\n", atomic_read(&sess
->nconn
),
4357 sess
->sess_ops
->InitiatorName
);
4361 spin_lock_bh(&se_tpg
->session_lock
);
4362 atomic_set(&sess
->session_logout
, 1);
4363 atomic_set(&sess
->session_reinstatement
, 1);
4364 iscsit_stop_time2retain_timer(sess
);
4365 spin_unlock_bh(&se_tpg
->session_lock
);
4368 * transport_deregister_session_configfs() will clear the
4369 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4370 * can be setting it again with __transport_register_session() in
4371 * iscsi_post_login_handler() again after the iscsit_stop_session()
4372 * completes in iscsi_np context.
4374 transport_deregister_session_configfs(sess
->se_sess
);
4377 * If any other processes are accessing this session pointer we must
4378 * wait until they have completed. If we are in an interrupt (the
4379 * time2retain handler) and contain and active session usage count we
4380 * restart the timer and exit.
4382 if (!in_interrupt()) {
4383 if (iscsit_check_session_usage_count(sess
) == 1)
4384 iscsit_stop_session(sess
, 1, 1);
4386 if (iscsit_check_session_usage_count(sess
) == 2) {
4387 atomic_set(&sess
->session_logout
, 0);
4388 iscsit_start_time2retain_handler(sess
);
4393 transport_deregister_session(sess
->se_sess
);
4395 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4396 iscsit_free_connection_recovery_entires(sess
);
4398 iscsit_free_all_ooo_cmdsns(sess
);
4400 spin_lock_bh(&se_tpg
->session_lock
);
4401 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402 sess
->session_state
= TARG_SESS_STATE_FREE
;
4403 pr_debug("Released iSCSI session from node: %s\n",
4404 sess
->sess_ops
->InitiatorName
);
4407 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4409 pr_debug("Decremented number of active iSCSI Sessions on"
4410 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4412 spin_lock(&sess_idr_lock
);
4413 idr_remove(&sess_idr
, sess
->session_index
);
4414 spin_unlock(&sess_idr_lock
);
4416 kfree(sess
->sess_ops
);
4417 sess
->sess_ops
= NULL
;
4418 spin_unlock_bh(&se_tpg
->session_lock
);
4424 static void iscsit_logout_post_handler_closesession(
4425 struct iscsi_conn
*conn
)
4427 struct iscsi_session
*sess
= conn
->sess
;
4430 * Traditional iscsi/tcp will invoke this logic from TX thread
4431 * context during session logout, so clear tx_thread_active and
4432 * sleep if iscsit_close_connection() has not already occured.
4434 * Since iser-target invokes this logic from it's own workqueue,
4435 * always sleep waiting for RX/TX thread shutdown to complete
4436 * within iscsit_close_connection().
4438 if (!conn
->conn_transport
->rdma_shutdown
) {
4439 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4444 atomic_set(&conn
->conn_logout_remove
, 0);
4445 complete(&conn
->conn_logout_comp
);
4447 iscsit_dec_conn_usage_count(conn
);
4448 iscsit_stop_session(sess
, sleep
, sleep
);
4449 iscsit_dec_session_usage_count(sess
);
4450 iscsit_close_session(sess
);
4453 static void iscsit_logout_post_handler_samecid(
4454 struct iscsi_conn
*conn
)
4458 if (!conn
->conn_transport
->rdma_shutdown
) {
4459 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4464 atomic_set(&conn
->conn_logout_remove
, 0);
4465 complete(&conn
->conn_logout_comp
);
4467 iscsit_cause_connection_reinstatement(conn
, sleep
);
4468 iscsit_dec_conn_usage_count(conn
);
4471 static void iscsit_logout_post_handler_diffcid(
4472 struct iscsi_conn
*conn
,
4475 struct iscsi_conn
*l_conn
;
4476 struct iscsi_session
*sess
= conn
->sess
;
4477 bool conn_found
= false;
4482 spin_lock_bh(&sess
->conn_lock
);
4483 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4484 if (l_conn
->cid
== cid
) {
4485 iscsit_inc_conn_usage_count(l_conn
);
4490 spin_unlock_bh(&sess
->conn_lock
);
4496 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4498 spin_lock_bh(&l_conn
->state_lock
);
4499 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4500 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4501 spin_unlock_bh(&l_conn
->state_lock
);
4503 iscsit_cause_connection_reinstatement(l_conn
, 1);
4504 iscsit_dec_conn_usage_count(l_conn
);
4508 * Return of 0 causes the TX thread to restart.
4510 int iscsit_logout_post_handler(
4511 struct iscsi_cmd
*cmd
,
4512 struct iscsi_conn
*conn
)
4516 switch (cmd
->logout_reason
) {
4517 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4518 switch (cmd
->logout_response
) {
4519 case ISCSI_LOGOUT_SUCCESS
:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4522 iscsit_logout_post_handler_closesession(conn
);
4527 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4528 if (conn
->cid
== cmd
->logout_cid
) {
4529 switch (cmd
->logout_response
) {
4530 case ISCSI_LOGOUT_SUCCESS
:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4533 iscsit_logout_post_handler_samecid(conn
);
4538 switch (cmd
->logout_response
) {
4539 case ISCSI_LOGOUT_SUCCESS
:
4540 iscsit_logout_post_handler_diffcid(conn
,
4543 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4544 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4551 case ISCSI_LOGOUT_REASON_RECOVERY
:
4552 switch (cmd
->logout_response
) {
4553 case ISCSI_LOGOUT_SUCCESS
:
4554 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4555 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4556 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4568 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4570 void iscsit_fail_session(struct iscsi_session
*sess
)
4572 struct iscsi_conn
*conn
;
4574 spin_lock_bh(&sess
->conn_lock
);
4575 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4576 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4577 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4579 spin_unlock_bh(&sess
->conn_lock
);
4581 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4582 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4585 int iscsit_free_session(struct iscsi_session
*sess
)
4587 u16 conn_count
= atomic_read(&sess
->nconn
);
4588 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4591 spin_lock_bh(&sess
->conn_lock
);
4592 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4594 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4596 if (conn_count
== 0)
4599 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4602 iscsit_inc_conn_usage_count(conn_tmp
);
4605 iscsit_inc_conn_usage_count(conn
);
4607 spin_unlock_bh(&sess
->conn_lock
);
4608 iscsit_cause_connection_reinstatement(conn
, 1);
4609 spin_lock_bh(&sess
->conn_lock
);
4611 iscsit_dec_conn_usage_count(conn
);
4613 iscsit_dec_conn_usage_count(conn_tmp
);
4618 if (atomic_read(&sess
->nconn
)) {
4619 spin_unlock_bh(&sess
->conn_lock
);
4620 wait_for_completion(&sess
->session_wait_comp
);
4622 spin_unlock_bh(&sess
->conn_lock
);
4624 iscsit_close_session(sess
);
4628 void iscsit_stop_session(
4629 struct iscsi_session
*sess
,
4631 int connection_sleep
)
4633 u16 conn_count
= atomic_read(&sess
->nconn
);
4634 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4637 spin_lock_bh(&sess
->conn_lock
);
4639 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4641 if (connection_sleep
) {
4642 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4644 if (conn_count
== 0)
4647 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4650 iscsit_inc_conn_usage_count(conn_tmp
);
4653 iscsit_inc_conn_usage_count(conn
);
4655 spin_unlock_bh(&sess
->conn_lock
);
4656 iscsit_cause_connection_reinstatement(conn
, 1);
4657 spin_lock_bh(&sess
->conn_lock
);
4659 iscsit_dec_conn_usage_count(conn
);
4661 iscsit_dec_conn_usage_count(conn_tmp
);
4665 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4666 iscsit_cause_connection_reinstatement(conn
, 0);
4669 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4670 spin_unlock_bh(&sess
->conn_lock
);
4671 wait_for_completion(&sess
->session_wait_comp
);
4673 spin_unlock_bh(&sess
->conn_lock
);
4676 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4678 struct iscsi_session
*sess
;
4679 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4680 struct se_session
*se_sess
, *se_sess_tmp
;
4681 LIST_HEAD(free_list
);
4682 int session_count
= 0;
4684 spin_lock_bh(&se_tpg
->session_lock
);
4685 if (tpg
->nsessions
&& !force
) {
4686 spin_unlock_bh(&se_tpg
->session_lock
);
4690 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4692 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4694 spin_lock(&sess
->conn_lock
);
4695 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4696 atomic_read(&sess
->session_logout
) ||
4697 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4698 spin_unlock(&sess
->conn_lock
);
4701 atomic_set(&sess
->session_reinstatement
, 1);
4702 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4703 spin_unlock(&sess
->conn_lock
);
4705 list_move_tail(&se_sess
->sess_list
, &free_list
);
4707 spin_unlock_bh(&se_tpg
->session_lock
);
4709 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &free_list
, sess_list
) {
4710 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4712 iscsit_free_session(sess
);
4716 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4717 " Group: %hu\n", session_count
, tpg
->tpgt
);
4721 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4722 MODULE_VERSION("4.1.x");
4723 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4724 MODULE_LICENSE("GPL");
4726 module_init(iscsi_target_init_module
);
4727 module_exit(iscsi_target_cleanup_module
);