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 spin_lock_bh(&conn
->cmd_lock
);
492 if (!list_empty(&cmd
->i_conn_node
) &&
493 !(cmd
->se_cmd
.transport_state
& CMD_T_FABRIC_STOP
))
494 list_del_init(&cmd
->i_conn_node
);
495 spin_unlock_bh(&conn
->cmd_lock
);
497 __iscsit_free_cmd(cmd
, true);
499 EXPORT_SYMBOL(iscsit_aborted_task
);
501 static void iscsit_do_crypto_hash_buf(struct ahash_request
*, const void *,
502 u32
, u32
, u8
*, u8
*);
503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*);
506 iscsit_xmit_nondatain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
507 const void *data_buf
, u32 data_buf_len
)
509 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)cmd
->pdu
;
511 u32 niov
= 0, tx_size
= ISCSI_HDR_LEN
;
514 iov
= &cmd
->iov_misc
[0];
515 iov
[niov
].iov_base
= cmd
->pdu
;
516 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
518 if (conn
->conn_ops
->HeaderDigest
) {
519 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
521 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, hdr
,
522 ISCSI_HDR_LEN
, 0, NULL
,
523 (u8
*)header_digest
);
525 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
526 tx_size
+= ISCSI_CRC_LEN
;
527 pr_debug("Attaching CRC32C HeaderDigest"
528 " to opcode 0x%x 0x%08x\n",
529 hdr
->opcode
, *header_digest
);
533 u32 padding
= ((-data_buf_len
) & 3);
535 iov
[niov
].iov_base
= (void *)data_buf
;
536 iov
[niov
++].iov_len
= data_buf_len
;
537 tx_size
+= data_buf_len
;
540 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
541 iov
[niov
++].iov_len
= padding
;
543 pr_debug("Attaching %u additional"
544 " padding bytes.\n", padding
);
547 if (conn
->conn_ops
->DataDigest
) {
548 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
,
549 data_buf
, data_buf_len
,
551 (u8
*)&cmd
->pad_bytes
,
552 (u8
*)&cmd
->data_crc
);
554 iov
[niov
].iov_base
= &cmd
->data_crc
;
555 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
556 tx_size
+= ISCSI_CRC_LEN
;
557 pr_debug("Attached DataDigest for %u"
558 " bytes opcode 0x%x, CRC 0x%08x\n",
559 data_buf_len
, hdr
->opcode
, cmd
->data_crc
);
563 cmd
->iov_misc_count
= niov
;
564 cmd
->tx_size
= tx_size
;
566 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
568 iscsit_tx_thread_wait_for_tcp(conn
);
575 static int iscsit_map_iovec(struct iscsi_cmd
*, struct kvec
*, u32
, u32
);
576 static void iscsit_unmap_iovec(struct iscsi_cmd
*);
577 static u32
iscsit_do_crypto_hash_sg(struct ahash_request
*, struct iscsi_cmd
*,
578 u32
, u32
, u32
, u8
*);
580 iscsit_xmit_datain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
581 const struct iscsi_datain
*datain
)
584 u32 iov_count
= 0, tx_size
= 0;
587 iov
= &cmd
->iov_data
[0];
588 iov
[iov_count
].iov_base
= cmd
->pdu
;
589 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
590 tx_size
+= ISCSI_HDR_LEN
;
592 if (conn
->conn_ops
->HeaderDigest
) {
593 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
595 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, cmd
->pdu
,
596 ISCSI_HDR_LEN
, 0, NULL
,
597 (u8
*)header_digest
);
599 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
600 tx_size
+= ISCSI_CRC_LEN
;
602 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
606 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1],
607 datain
->offset
, datain
->length
);
611 iov_count
+= iov_ret
;
612 tx_size
+= datain
->length
;
614 cmd
->padding
= ((-datain
->length
) & 3);
616 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
617 iov
[iov_count
++].iov_len
= cmd
->padding
;
618 tx_size
+= cmd
->padding
;
620 pr_debug("Attaching %u padding bytes\n", cmd
->padding
);
623 if (conn
->conn_ops
->DataDigest
) {
624 cmd
->data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_tx_hash
,
630 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
631 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
632 tx_size
+= ISCSI_CRC_LEN
;
634 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
635 datain
->length
+ cmd
->padding
, cmd
->data_crc
);
638 cmd
->iov_data_count
= iov_count
;
639 cmd
->tx_size
= tx_size
;
641 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
643 iscsit_unmap_iovec(cmd
);
646 iscsit_tx_thread_wait_for_tcp(conn
);
653 static int iscsit_xmit_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
654 struct iscsi_datain_req
*dr
, const void *buf
,
658 return iscsit_xmit_datain_pdu(conn
, cmd
, buf
);
660 return iscsit_xmit_nondatain_pdu(conn
, cmd
, buf
, buf_len
);
663 static enum target_prot_op
iscsit_get_sup_prot_ops(struct iscsi_conn
*conn
)
665 return TARGET_PROT_NORMAL
;
668 static struct iscsit_transport iscsi_target_transport
= {
670 .transport_type
= ISCSI_TCP
,
671 .rdma_shutdown
= false,
673 .iscsit_setup_np
= iscsit_setup_np
,
674 .iscsit_accept_np
= iscsit_accept_np
,
675 .iscsit_free_np
= iscsit_free_np
,
676 .iscsit_get_login_rx
= iscsit_get_login_rx
,
677 .iscsit_put_login_tx
= iscsit_put_login_tx
,
678 .iscsit_get_dataout
= iscsit_build_r2ts_for_cmd
,
679 .iscsit_immediate_queue
= iscsit_immediate_queue
,
680 .iscsit_response_queue
= iscsit_response_queue
,
681 .iscsit_queue_data_in
= iscsit_queue_rsp
,
682 .iscsit_queue_status
= iscsit_queue_rsp
,
683 .iscsit_aborted_task
= iscsit_aborted_task
,
684 .iscsit_xmit_pdu
= iscsit_xmit_pdu
,
685 .iscsit_get_rx_pdu
= iscsit_get_rx_pdu
,
686 .iscsit_get_sup_prot_ops
= iscsit_get_sup_prot_ops
,
689 static int __init
iscsi_target_init_module(void)
693 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
694 iscsit_global
= kzalloc(sizeof(*iscsit_global
), GFP_KERNEL
);
698 spin_lock_init(&iscsit_global
->ts_bitmap_lock
);
699 mutex_init(&auth_id_lock
);
700 spin_lock_init(&sess_idr_lock
);
704 ret
= target_register_template(&iscsi_ops
);
708 size
= BITS_TO_LONGS(ISCSIT_BITMAP_BITS
) * sizeof(long);
709 iscsit_global
->ts_bitmap
= vzalloc(size
);
710 if (!iscsit_global
->ts_bitmap
)
713 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
714 sizeof(struct iscsi_queue_req
),
715 __alignof__(struct iscsi_queue_req
), 0, NULL
);
717 pr_err("nable to kmem_cache_create() for"
722 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
723 sizeof(struct iscsi_datain_req
),
724 __alignof__(struct iscsi_datain_req
), 0, NULL
);
726 pr_err("Unable to kmem_cache_create() for"
731 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
732 sizeof(struct iscsi_ooo_cmdsn
),
733 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
734 if (!lio_ooo_cache
) {
735 pr_err("Unable to kmem_cache_create() for"
740 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
741 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
743 if (!lio_r2t_cache
) {
744 pr_err("Unable to kmem_cache_create() for"
749 iscsit_register_transport(&iscsi_target_transport
);
751 if (iscsit_load_discovery_tpg() < 0)
756 iscsit_unregister_transport(&iscsi_target_transport
);
757 kmem_cache_destroy(lio_r2t_cache
);
759 kmem_cache_destroy(lio_ooo_cache
);
761 kmem_cache_destroy(lio_dr_cache
);
763 kmem_cache_destroy(lio_qr_cache
);
765 vfree(iscsit_global
->ts_bitmap
);
767 /* XXX: this probably wants it to be it's own unwind step.. */
768 if (iscsit_global
->discovery_tpg
)
769 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
770 target_unregister_template(&iscsi_ops
);
772 kfree(iscsit_global
);
776 static void __exit
iscsi_target_cleanup_module(void)
778 iscsit_release_discovery_tpg();
779 iscsit_unregister_transport(&iscsi_target_transport
);
780 kmem_cache_destroy(lio_qr_cache
);
781 kmem_cache_destroy(lio_dr_cache
);
782 kmem_cache_destroy(lio_ooo_cache
);
783 kmem_cache_destroy(lio_r2t_cache
);
786 * Shutdown discovery sessions and disable discovery TPG
788 if (iscsit_global
->discovery_tpg
)
789 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
791 target_unregister_template(&iscsi_ops
);
793 vfree(iscsit_global
->ts_bitmap
);
794 kfree(iscsit_global
);
797 int iscsit_add_reject(
798 struct iscsi_conn
*conn
,
802 struct iscsi_cmd
*cmd
;
804 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
808 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
809 cmd
->reject_reason
= reason
;
811 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
813 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
814 iscsit_free_cmd(cmd
, false);
818 spin_lock_bh(&conn
->cmd_lock
);
819 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
820 spin_unlock_bh(&conn
->cmd_lock
);
822 cmd
->i_state
= ISTATE_SEND_REJECT
;
823 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
827 EXPORT_SYMBOL(iscsit_add_reject
);
829 static int iscsit_add_reject_from_cmd(
830 struct iscsi_cmd
*cmd
,
835 struct iscsi_conn
*conn
;
838 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
844 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
845 cmd
->reject_reason
= reason
;
847 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
849 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
850 iscsit_free_cmd(cmd
, false);
855 spin_lock_bh(&conn
->cmd_lock
);
856 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
857 spin_unlock_bh(&conn
->cmd_lock
);
860 cmd
->i_state
= ISTATE_SEND_REJECT
;
861 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
863 * Perform the kref_put now if se_cmd has already been setup by
864 * scsit_setup_scsi_cmd()
866 if (cmd
->se_cmd
.se_tfo
!= NULL
) {
867 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
868 target_put_sess_cmd(&cmd
->se_cmd
);
873 static int iscsit_add_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
,
876 return iscsit_add_reject_from_cmd(cmd
, reason
, true, buf
);
879 int iscsit_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
, unsigned char *buf
)
881 return iscsit_add_reject_from_cmd(cmd
, reason
, false, buf
);
883 EXPORT_SYMBOL(iscsit_reject_cmd
);
886 * Map some portion of the allocated scatterlist to an iovec, suitable for
887 * kernel sockets to copy data in/out.
889 static int iscsit_map_iovec(
890 struct iscsi_cmd
*cmd
,
896 struct scatterlist
*sg
;
897 unsigned int page_off
;
900 * We know each entry in t_data_sg contains a page.
902 u32 ent
= data_offset
/ PAGE_SIZE
;
904 if (ent
>= cmd
->se_cmd
.t_data_nents
) {
905 pr_err("Initial page entry out-of-bounds\n");
909 sg
= &cmd
->se_cmd
.t_data_sg
[ent
];
910 page_off
= (data_offset
% PAGE_SIZE
);
912 cmd
->first_data_sg
= sg
;
913 cmd
->first_data_sg_off
= page_off
;
915 while (data_length
) {
916 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
918 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
919 iov
[i
].iov_len
= cur_len
;
921 data_length
-= cur_len
;
927 cmd
->kmapped_nents
= i
;
932 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
935 struct scatterlist
*sg
;
937 sg
= cmd
->first_data_sg
;
939 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
940 kunmap(sg_page(&sg
[i
]));
943 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
946 struct iscsi_cmd
*cmd
, *cmd_p
;
948 conn
->exp_statsn
= exp_statsn
;
950 if (conn
->sess
->sess_ops
->RDMAExtensions
)
953 spin_lock_bh(&conn
->cmd_lock
);
954 list_for_each_entry_safe(cmd
, cmd_p
, &conn
->conn_cmd_list
, i_conn_node
) {
955 spin_lock(&cmd
->istate_lock
);
956 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
957 iscsi_sna_lt(cmd
->stat_sn
, exp_statsn
)) {
958 cmd
->i_state
= ISTATE_REMOVE
;
959 spin_unlock(&cmd
->istate_lock
);
960 list_move_tail(&cmd
->i_conn_node
, &ack_list
);
963 spin_unlock(&cmd
->istate_lock
);
965 spin_unlock_bh(&conn
->cmd_lock
);
967 list_for_each_entry_safe(cmd
, cmd_p
, &ack_list
, i_conn_node
) {
968 list_del_init(&cmd
->i_conn_node
);
969 iscsit_free_cmd(cmd
, false);
973 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
975 u32 iov_count
= max(1UL, DIV_ROUND_UP(cmd
->se_cmd
.data_length
, PAGE_SIZE
));
977 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
978 cmd
->iov_data
= kcalloc(iov_count
, sizeof(*cmd
->iov_data
), GFP_KERNEL
);
982 cmd
->orig_iov_data_count
= iov_count
;
986 int iscsit_setup_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
989 int data_direction
, payload_length
;
990 struct iscsi_scsi_req
*hdr
;
994 atomic_long_inc(&conn
->sess
->cmd_pdus
);
996 hdr
= (struct iscsi_scsi_req
*) buf
;
997 payload_length
= ntoh24(hdr
->dlength
);
999 /* FIXME; Add checks for AdditionalHeaderSegment */
1001 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
1002 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1003 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1004 " not set. Bad iSCSI Initiator.\n");
1005 return iscsit_add_reject_cmd(cmd
,
1006 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1009 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
1010 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
1012 * From RFC-3720 Section 10.3.1:
1014 * "Either or both of R and W MAY be 1 when either the
1015 * Expected Data Transfer Length and/or Bidirectional Read
1016 * Expected Data Transfer Length are 0"
1018 * For this case, go ahead and clear the unnecssary bits
1019 * to avoid any confusion with ->data_direction.
1021 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
1022 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
1024 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1025 " set when Expected Data Transfer Length is 0 for"
1026 " CDB: 0x%02x, Fixing up flags\n", hdr
->cdb
[0]);
1029 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1030 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
1031 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1032 " MUST be set if Expected Data Transfer Length is not 0."
1033 " Bad iSCSI Initiator\n");
1034 return iscsit_add_reject_cmd(cmd
,
1035 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1038 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1039 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
1040 pr_err("Bidirectional operations not supported!\n");
1041 return iscsit_add_reject_cmd(cmd
,
1042 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1045 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1046 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1047 " Scsi Command PDU.\n");
1048 return iscsit_add_reject_cmd(cmd
,
1049 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1052 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
1053 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1054 " protocol error.\n", payload_length
);
1055 return iscsit_add_reject_cmd(cmd
,
1056 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1059 if ((be32_to_cpu(hdr
->data_length
) == payload_length
) &&
1060 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
1061 pr_err("Expected Data Transfer Length and Length of"
1062 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1063 " bit is not set protocol error\n");
1064 return iscsit_add_reject_cmd(cmd
,
1065 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1068 if (payload_length
> be32_to_cpu(hdr
->data_length
)) {
1069 pr_err("DataSegmentLength: %u is greater than"
1070 " EDTL: %u, protocol error.\n", payload_length
,
1072 return iscsit_add_reject_cmd(cmd
,
1073 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1076 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1077 pr_err("DataSegmentLength: %u is greater than"
1078 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1079 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1080 return iscsit_add_reject_cmd(cmd
,
1081 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1084 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
1085 pr_err("DataSegmentLength: %u is greater than"
1086 " FirstBurstLength: %u, protocol error.\n",
1087 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
1088 return iscsit_add_reject_cmd(cmd
,
1089 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1092 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
1093 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
1096 cmd
->data_direction
= data_direction
;
1097 iscsi_task_attr
= hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
;
1099 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101 if ((iscsi_task_attr
== ISCSI_ATTR_UNTAGGED
) ||
1102 (iscsi_task_attr
== ISCSI_ATTR_SIMPLE
))
1103 sam_task_attr
= TCM_SIMPLE_TAG
;
1104 else if (iscsi_task_attr
== ISCSI_ATTR_ORDERED
)
1105 sam_task_attr
= TCM_ORDERED_TAG
;
1106 else if (iscsi_task_attr
== ISCSI_ATTR_HEAD_OF_QUEUE
)
1107 sam_task_attr
= TCM_HEAD_TAG
;
1108 else if (iscsi_task_attr
== ISCSI_ATTR_ACA
)
1109 sam_task_attr
= TCM_ACA_TAG
;
1111 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1112 " TCM_SIMPLE_TAG\n", iscsi_task_attr
);
1113 sam_task_attr
= TCM_SIMPLE_TAG
;
1116 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
1117 cmd
->i_state
= ISTATE_NEW_CMD
;
1118 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1119 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
1120 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
1121 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
1122 if (cmd
->unsolicited_data
)
1123 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
1125 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1126 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
)
1127 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
1129 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1130 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1131 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1132 cmd
->first_burst_len
= payload_length
;
1134 if (!conn
->sess
->sess_ops
->RDMAExtensions
&&
1135 cmd
->data_direction
== DMA_FROM_DEVICE
) {
1136 struct iscsi_datain_req
*dr
;
1138 dr
= iscsit_allocate_datain_req();
1140 return iscsit_add_reject_cmd(cmd
,
1141 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1143 iscsit_attach_datain_req(cmd
, dr
);
1147 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
1150 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
1151 cmd
->data_direction
, sam_task_attr
,
1152 cmd
->sense_buffer
+ 2);
1154 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1155 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
1156 hdr
->cmdsn
, be32_to_cpu(hdr
->data_length
), payload_length
,
1159 target_get_sess_cmd(&cmd
->se_cmd
, true);
1161 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
1162 scsilun_to_int(&hdr
->lun
));
1163 if (cmd
->sense_reason
)
1166 /* only used for printks or comparing with ->ref_task_tag */
1167 cmd
->se_cmd
.tag
= (__force u32
)cmd
->init_task_tag
;
1168 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
1169 if (cmd
->sense_reason
) {
1170 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
1171 return iscsit_add_reject_cmd(cmd
,
1172 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1178 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
1179 return iscsit_add_reject_cmd(cmd
,
1180 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1184 spin_lock_bh(&conn
->cmd_lock
);
1185 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1186 spin_unlock_bh(&conn
->cmd_lock
);
1188 * Check if we need to delay processing because of ALUA
1189 * Active/NonOptimized primary access state..
1191 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd
);
1197 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd
*cmd
)
1199 iscsit_set_dataout_sequence_values(cmd
);
1201 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1202 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1203 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1205 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout
);
1207 int iscsit_process_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1208 struct iscsi_scsi_req
*hdr
)
1212 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1213 * the Immediate Bit is not set, and no Immediate
1216 * A PDU/CmdSN carrying Immediate Data can only
1217 * be processed after the DataCRC has passed.
1218 * If the DataCRC fails, the CmdSN MUST NOT
1219 * be acknowledged. (See below)
1221 if (!cmd
->immediate_data
) {
1222 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1223 (unsigned char *)hdr
, hdr
->cmdsn
);
1224 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1226 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1227 target_put_sess_cmd(&cmd
->se_cmd
);
1232 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1235 * If no Immediate Data is attached, it's OK to return now.
1237 if (!cmd
->immediate_data
) {
1238 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
)
1239 iscsit_set_unsoliticed_dataout(cmd
);
1240 if (!cmd
->sense_reason
)
1243 target_put_sess_cmd(&cmd
->se_cmd
);
1248 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1249 * execution. These exceptions are processed in CmdSN order using
1250 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252 if (cmd
->sense_reason
)
1255 * Call directly into transport_generic_new_cmd() to perform
1256 * the backend memory allocation.
1258 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1259 if (cmd
->sense_reason
)
1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd
);
1267 iscsit_get_immediate_data(struct iscsi_cmd
*cmd
, struct iscsi_scsi_req
*hdr
,
1270 int cmdsn_ret
= 0, immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1272 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1275 goto after_immediate_data
;
1277 * Check for underflow case where both EDTL and immediate data payload
1278 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1279 * already been set in target_cmd_size_check() as se_cmd->data_length.
1281 * For this special case, fail the command and dump the immediate data
1284 if (cmd
->first_burst_len
> cmd
->se_cmd
.data_length
) {
1285 cmd
->sense_reason
= TCM_INVALID_CDB_FIELD
;
1286 goto after_immediate_data
;
1289 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1290 cmd
->first_burst_len
);
1291 after_immediate_data
:
1292 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1294 * A PDU/CmdSN carrying Immediate Data passed
1295 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1296 * Immediate Bit is not set.
1298 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1299 (unsigned char *)hdr
, hdr
->cmdsn
);
1300 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1303 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1306 rc
= iscsit_dump_data_payload(cmd
->conn
,
1307 cmd
->first_burst_len
, 1);
1308 target_put_sess_cmd(&cmd
->se_cmd
);
1310 } else if (cmd
->unsolicited_data
)
1311 iscsit_set_unsoliticed_dataout(cmd
);
1313 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1315 * Immediate Data failed DataCRC and ERL>=1,
1316 * silently drop this PDU and let the initiator
1317 * plug the CmdSN gap.
1319 * FIXME: Send Unsolicited NOPIN with reserved
1320 * TTT here to help the initiator figure out
1321 * the missing CmdSN, although they should be
1322 * intelligent enough to determine the missing
1323 * CmdSN and issue a retry to plug the sequence.
1325 cmd
->i_state
= ISTATE_REMOVE
;
1326 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1327 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1334 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1337 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1339 bool dump_payload
= false;
1341 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1345 * Allocation iovecs needed for struct socket operations for
1346 * traditional iSCSI block I/O.
1348 if (iscsit_allocate_iovecs(cmd
) < 0) {
1349 return iscsit_reject_cmd(cmd
,
1350 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1352 immed_data
= cmd
->immediate_data
;
1354 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1358 dump_payload
= true;
1363 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1366 static u32
iscsit_do_crypto_hash_sg(
1367 struct ahash_request
*hash
,
1368 struct iscsi_cmd
*cmd
,
1375 struct scatterlist
*sg
;
1376 unsigned int page_off
;
1378 crypto_ahash_init(hash
);
1380 sg
= cmd
->first_data_sg
;
1381 page_off
= cmd
->first_data_sg_off
;
1383 while (data_length
) {
1384 u32 cur_len
= min_t(u32
, data_length
, (sg
->length
- page_off
));
1386 ahash_request_set_crypt(hash
, sg
, NULL
, cur_len
);
1387 crypto_ahash_update(hash
);
1389 data_length
-= cur_len
;
1391 /* iscsit_map_iovec has already checked for invalid sg pointers */
1396 struct scatterlist pad_sg
;
1398 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1399 ahash_request_set_crypt(hash
, &pad_sg
, (u8
*)&data_crc
,
1401 crypto_ahash_finup(hash
);
1403 ahash_request_set_crypt(hash
, NULL
, (u8
*)&data_crc
, 0);
1404 crypto_ahash_final(hash
);
1410 static void iscsit_do_crypto_hash_buf(
1411 struct ahash_request
*hash
,
1418 struct scatterlist sg
[2];
1420 sg_init_table(sg
, ARRAY_SIZE(sg
));
1421 sg_set_buf(sg
, buf
, payload_length
);
1422 sg_set_buf(sg
+ 1, pad_bytes
, padding
);
1424 ahash_request_set_crypt(hash
, sg
, data_crc
, payload_length
+ padding
);
1426 crypto_ahash_digest(hash
);
1430 __iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1431 struct iscsi_cmd
*cmd
, u32 payload_length
,
1434 struct iscsi_data
*hdr
= buf
;
1435 struct se_cmd
*se_cmd
;
1439 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1441 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1442 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1443 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1444 payload_length
, conn
->cid
);
1446 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1447 pr_err("Command ITT: 0x%08x received DataOUT after"
1448 " last DataOUT received, dumping payload\n",
1449 cmd
->init_task_tag
);
1450 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1453 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1454 pr_err("Command ITT: 0x%08x received DataOUT for a"
1455 " NON-WRITE command.\n", cmd
->init_task_tag
);
1456 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1458 se_cmd
= &cmd
->se_cmd
;
1459 iscsit_mod_dataout_timer(cmd
);
1461 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1462 pr_err("DataOut Offset: %u, Length %u greater than"
1463 " iSCSI Command EDTL %u, protocol error.\n",
1464 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1465 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1468 if (cmd
->unsolicited_data
) {
1469 int dump_unsolicited_data
= 0;
1471 if (conn
->sess
->sess_ops
->InitialR2T
) {
1472 pr_err("Received unexpected unsolicited data"
1473 " while InitialR2T=Yes, protocol error.\n");
1474 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1475 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1479 * Special case for dealing with Unsolicited DataOUT
1480 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1484 /* Something's amiss if we're not in WRITE_PENDING state... */
1485 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1486 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1487 dump_unsolicited_data
= 1;
1489 if (dump_unsolicited_data
) {
1491 * Check if a delayed TASK_ABORTED status needs to
1492 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1493 * received with the unsolicited data out.
1495 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1496 iscsit_stop_dataout_timer(cmd
);
1498 transport_check_aborted_status(se_cmd
,
1499 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1500 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1504 * For the normal solicited data path:
1506 * Check for a delayed TASK_ABORTED status and dump any
1507 * incoming data out payload if one exists. Also, when the
1508 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1509 * data out sequence, we decrement outstanding_r2ts. Once
1510 * outstanding_r2ts reaches zero, go ahead and send the delayed
1511 * TASK_ABORTED status.
1513 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1514 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1515 if (--cmd
->outstanding_r2ts
< 1) {
1516 iscsit_stop_dataout_timer(cmd
);
1517 transport_check_aborted_status(
1521 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1526 * within-command recovery checks before receiving the payload.
1528 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1529 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1531 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr
);
1539 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1540 struct iscsi_cmd
**out_cmd
)
1542 struct iscsi_data
*hdr
= buf
;
1543 struct iscsi_cmd
*cmd
;
1544 u32 payload_length
= ntoh24(hdr
->dlength
);
1546 bool success
= false;
1548 if (!payload_length
) {
1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1553 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1554 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1555 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1556 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1557 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1560 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
, payload_length
);
1564 rc
= __iscsit_check_dataout_hdr(conn
, buf
, cmd
, payload_length
, &success
);
1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1574 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1575 struct iscsi_data
*hdr
)
1578 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1579 u32 payload_length
= ntoh24(hdr
->dlength
);
1580 int iov_ret
, data_crc_failed
= 0;
1582 rx_size
+= payload_length
;
1583 iov
= &cmd
->iov_data
[0];
1585 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1590 iov_count
+= iov_ret
;
1592 padding
= ((-payload_length
) & 3);
1594 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1595 iov
[iov_count
++].iov_len
= padding
;
1597 pr_debug("Receiving %u padding bytes.\n", padding
);
1600 if (conn
->conn_ops
->DataDigest
) {
1601 iov
[iov_count
].iov_base
= &checksum
;
1602 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1603 rx_size
+= ISCSI_CRC_LEN
;
1606 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1608 iscsit_unmap_iovec(cmd
);
1610 if (rx_got
!= rx_size
)
1613 if (conn
->conn_ops
->DataDigest
) {
1616 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
1617 be32_to_cpu(hdr
->offset
),
1618 payload_length
, padding
,
1621 if (checksum
!= data_crc
) {
1622 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1623 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1624 " does not match computed 0x%08x\n",
1625 hdr
->itt
, hdr
->offset
, payload_length
,
1626 hdr
->datasn
, checksum
, data_crc
);
1627 data_crc_failed
= 1;
1629 pr_debug("Got CRC32C DataDigest 0x%08x for"
1630 " %u bytes of Data Out\n", checksum
,
1635 return data_crc_failed
;
1639 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1640 bool data_crc_failed
)
1642 struct iscsi_conn
*conn
= cmd
->conn
;
1645 * Increment post receive data and CRC values or perform
1646 * within-command recovery.
1648 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1649 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1651 else if (rc
== DATAOUT_SEND_R2T
) {
1652 iscsit_set_dataout_sequence_values(cmd
);
1653 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1654 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1656 * Handle extra special case for out of order
1657 * Unsolicited Data Out.
1659 spin_lock_bh(&cmd
->istate_lock
);
1660 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1661 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1662 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1663 spin_unlock_bh(&cmd
->istate_lock
);
1665 iscsit_stop_dataout_timer(cmd
);
1668 target_execute_cmd(&cmd
->se_cmd
);
1670 } else /* DATAOUT_CANNOT_RECOVER */
1675 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1677 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1679 struct iscsi_cmd
*cmd
= NULL
;
1680 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1682 bool data_crc_failed
= false;
1684 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1690 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1694 data_crc_failed
= true;
1696 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1699 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1700 struct iscsi_nopout
*hdr
)
1702 u32 payload_length
= ntoh24(hdr
->dlength
);
1704 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1705 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1707 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1708 (unsigned char *)hdr
);
1710 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1711 (unsigned char *)hdr
);
1714 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1715 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1716 " not set, protocol error.\n");
1718 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1719 (unsigned char *)hdr
);
1721 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1722 (unsigned char *)hdr
);
1725 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1726 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1727 " greater than MaxXmitDataSegmentLength: %u, protocol"
1728 " error.\n", payload_length
,
1729 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1731 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1732 (unsigned char *)hdr
);
1734 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1735 (unsigned char *)hdr
);
1738 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1739 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1740 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1741 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1744 * This is not a response to a Unsolicited NopIN, which means
1745 * it can either be a NOPOUT ping request (with a valid ITT),
1746 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1747 * Either way, make sure we allocate an struct iscsi_cmd, as both
1748 * can contain ping data.
1750 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1751 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1752 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1753 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1755 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1756 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1757 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1758 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1759 cmd
->data_direction
= DMA_NONE
;
1764 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1766 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1767 struct iscsi_nopout
*hdr
)
1769 struct iscsi_cmd
*cmd_p
= NULL
;
1772 * Initiator is expecting a NopIN ping reply..
1774 if (hdr
->itt
!= RESERVED_ITT
) {
1776 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1777 (unsigned char *)hdr
);
1779 spin_lock_bh(&conn
->cmd_lock
);
1780 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1781 spin_unlock_bh(&conn
->cmd_lock
);
1783 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1785 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1786 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1791 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1792 (unsigned char *)hdr
, hdr
->cmdsn
);
1793 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1795 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1801 * This was a response to a unsolicited NOPIN ping.
1803 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1804 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1808 iscsit_stop_nopin_response_timer(conn
);
1810 cmd_p
->i_state
= ISTATE_REMOVE
;
1811 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1813 iscsit_start_nopin_timer(conn
);
1817 * Otherwise, initiator is not expecting a NOPIN is response.
1818 * Just ignore for now.
1822 iscsit_free_cmd(cmd
, false);
1826 EXPORT_SYMBOL(iscsit_process_nop_out
);
1828 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1831 unsigned char *ping_data
= NULL
;
1832 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1833 struct kvec
*iov
= NULL
;
1834 u32 payload_length
= ntoh24(hdr
->dlength
);
1837 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1841 * Handle NOP-OUT payload for traditional iSCSI sockets
1843 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1844 u32 checksum
, data_crc
, padding
= 0;
1845 int niov
= 0, rx_got
, rx_size
= payload_length
;
1847 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1853 iov
= &cmd
->iov_misc
[0];
1854 iov
[niov
].iov_base
= ping_data
;
1855 iov
[niov
++].iov_len
= payload_length
;
1857 padding
= ((-payload_length
) & 3);
1859 pr_debug("Receiving %u additional bytes"
1860 " for padding.\n", padding
);
1861 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1862 iov
[niov
++].iov_len
= padding
;
1865 if (conn
->conn_ops
->DataDigest
) {
1866 iov
[niov
].iov_base
= &checksum
;
1867 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1868 rx_size
+= ISCSI_CRC_LEN
;
1871 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1872 if (rx_got
!= rx_size
) {
1877 if (conn
->conn_ops
->DataDigest
) {
1878 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
1879 ping_data
, payload_length
,
1880 padding
, cmd
->pad_bytes
,
1883 if (checksum
!= data_crc
) {
1884 pr_err("Ping data CRC32C DataDigest"
1885 " 0x%08x does not match computed 0x%08x\n",
1886 checksum
, data_crc
);
1887 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1888 pr_err("Unable to recover from"
1889 " NOPOUT Ping DataCRC failure while in"
1895 * Silently drop this PDU and let the
1896 * initiator plug the CmdSN gap.
1898 pr_debug("Dropping NOPOUT"
1899 " Command CmdSN: 0x%08x due to"
1900 " DataCRC error.\n", hdr
->cmdsn
);
1905 pr_debug("Got CRC32C DataDigest"
1906 " 0x%08x for %u bytes of ping data.\n",
1907 checksum
, payload_length
);
1911 ping_data
[payload_length
] = '\0';
1913 * Attach ping data to struct iscsi_cmd->buf_ptr.
1915 cmd
->buf_ptr
= ping_data
;
1916 cmd
->buf_ptr_size
= payload_length
;
1918 pr_debug("Got %u bytes of NOPOUT ping"
1919 " data.\n", payload_length
);
1920 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1923 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1926 iscsit_free_cmd(cmd
, false);
1932 static enum tcm_tmreq_table
iscsit_convert_tmf(u8 iscsi_tmf
)
1934 switch (iscsi_tmf
) {
1935 case ISCSI_TM_FUNC_ABORT_TASK
:
1936 return TMR_ABORT_TASK
;
1937 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1938 return TMR_ABORT_TASK_SET
;
1939 case ISCSI_TM_FUNC_CLEAR_ACA
:
1940 return TMR_CLEAR_ACA
;
1941 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1942 return TMR_CLEAR_TASK_SET
;
1943 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1944 return TMR_LUN_RESET
;
1945 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1946 return TMR_TARGET_WARM_RESET
;
1947 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1948 return TMR_TARGET_COLD_RESET
;
1955 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1958 struct se_tmr_req
*se_tmr
;
1959 struct iscsi_tmr_req
*tmr_req
;
1960 struct iscsi_tm
*hdr
;
1961 int out_of_order_cmdsn
= 0, ret
;
1962 bool sess_ref
= false;
1963 u8 function
, tcm_function
= TMR_UNKNOWN
;
1965 hdr
= (struct iscsi_tm
*) buf
;
1966 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1967 function
= hdr
->flags
;
1969 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1970 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1971 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1972 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1974 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1975 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1976 hdr
->rtt
!= RESERVED_ITT
)) {
1977 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1978 hdr
->rtt
= RESERVED_ITT
;
1981 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1982 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1983 pr_err("Task Management Request TASK_REASSIGN not"
1984 " issued as immediate command, bad iSCSI Initiator"
1985 "implementation\n");
1986 return iscsit_add_reject_cmd(cmd
,
1987 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1989 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1990 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1991 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1993 cmd
->data_direction
= DMA_NONE
;
1994 cmd
->tmr_req
= kzalloc(sizeof(*cmd
->tmr_req
), GFP_KERNEL
);
1996 return iscsit_add_reject_cmd(cmd
,
1997 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
2001 * TASK_REASSIGN for ERL=2 / connection stays inside of
2002 * LIO-Target $FABRIC_MOD
2004 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2005 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
2006 conn
->sess
->se_sess
, 0, DMA_NONE
,
2007 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
2009 target_get_sess_cmd(&cmd
->se_cmd
, true);
2011 tcm_function
= iscsit_convert_tmf(function
);
2012 if (tcm_function
== TMR_UNKNOWN
) {
2013 pr_err("Unknown iSCSI TMR Function:"
2014 " 0x%02x\n", function
);
2015 return iscsit_add_reject_cmd(cmd
,
2016 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2019 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
, tcm_function
,
2022 return iscsit_add_reject_cmd(cmd
,
2023 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2025 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
2027 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
2028 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
2029 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2030 cmd
->init_task_tag
= hdr
->itt
;
2031 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2032 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2033 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2034 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
2035 tmr_req
= cmd
->tmr_req
;
2037 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2039 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2040 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
2041 scsilun_to_int(&hdr
->lun
));
2043 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
2049 case ISCSI_TM_FUNC_ABORT_TASK
:
2050 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
2051 if (se_tmr
->response
)
2054 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
2055 case ISCSI_TM_FUNC_CLEAR_ACA
:
2056 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
2057 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
2059 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
2060 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
2061 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2065 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
2066 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
2067 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2071 case ISCSI_TM_FUNC_TASK_REASSIGN
:
2072 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
2074 * Perform sanity checks on the ExpDataSN only if the
2075 * TASK_REASSIGN was successful.
2077 if (se_tmr
->response
)
2080 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
2081 return iscsit_add_reject_cmd(cmd
,
2082 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
2085 pr_err("Unknown TMR function: 0x%02x, protocol"
2086 " error.\n", function
);
2087 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
2091 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
2092 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
2093 se_tmr
->call_transport
= 1;
2095 spin_lock_bh(&conn
->cmd_lock
);
2096 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2097 spin_unlock_bh(&conn
->cmd_lock
);
2099 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2100 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2101 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
2102 out_of_order_cmdsn
= 1;
2103 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2105 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2108 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2110 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
2113 * Found the referenced task, send to transport for processing.
2115 if (se_tmr
->call_transport
)
2116 return transport_generic_handle_tmr(&cmd
->se_cmd
);
2119 * Could not find the referenced LUN, task, or Task Management
2120 * command not authorized or supported. Change state and
2121 * let the tx_thread send the response.
2123 * For connection recovery, this is also the default action for
2124 * TMR TASK_REASSIGN.
2127 pr_debug("Handle TMR, using sess_ref=true check\n");
2128 target_put_sess_cmd(&cmd
->se_cmd
);
2131 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2134 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
2136 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2138 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2139 struct iscsi_text
*hdr
)
2141 u32 payload_length
= ntoh24(hdr
->dlength
);
2143 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
2144 pr_err("Unable to accept text parameter length: %u"
2145 "greater than MaxXmitDataSegmentLength %u.\n",
2146 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
2147 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2148 (unsigned char *)hdr
);
2151 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
2152 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
2153 pr_err("Multi sequence text commands currently not supported\n");
2154 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
2155 (unsigned char *)hdr
);
2158 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2159 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
2160 hdr
->exp_statsn
, payload_length
);
2162 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
2163 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
2164 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2165 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2166 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2167 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2168 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2169 cmd
->data_direction
= DMA_NONE
;
2170 cmd
->text_in_ptr
= NULL
;
2174 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2177 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2178 struct iscsi_text
*hdr
)
2180 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2184 cmd
->targ_xfer_tag
= be32_to_cpu(hdr
->ttt
);
2185 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF) {
2186 pr_err("Unable to locate text_in buffer for sendtargets"
2190 goto empty_sendtargets
;
2192 if (strncmp("SendTargets", text_in
, 11) != 0) {
2193 pr_err("Received Text Data that is not"
2194 " SendTargets, cannot continue.\n");
2197 text_ptr
= strchr(text_in
, '=');
2199 pr_err("No \"=\" separator found in Text Data,"
2200 " cannot continue.\n");
2203 if (!strncmp("=All", text_ptr
, 4)) {
2204 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2205 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2206 !strncmp("=eui.", text_ptr
, 5)) {
2207 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2209 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2213 spin_lock_bh(&conn
->cmd_lock
);
2214 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2215 spin_unlock_bh(&conn
->cmd_lock
);
2218 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2220 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2221 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2222 (unsigned char *)hdr
, hdr
->cmdsn
);
2223 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2229 return iscsit_execute_cmd(cmd
, 0);
2232 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2233 (unsigned char *)hdr
);
2235 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2238 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2241 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2242 char *text_in
= NULL
;
2243 u32 payload_length
= ntoh24(hdr
->dlength
);
2246 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2250 rx_size
= payload_length
;
2251 if (payload_length
) {
2252 u32 checksum
= 0, data_crc
= 0;
2253 u32 padding
= 0, pad_bytes
= 0;
2254 int niov
= 0, rx_got
;
2257 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2261 cmd
->text_in_ptr
= text_in
;
2263 memset(iov
, 0, 3 * sizeof(struct kvec
));
2264 iov
[niov
].iov_base
= text_in
;
2265 iov
[niov
++].iov_len
= payload_length
;
2267 padding
= ((-payload_length
) & 3);
2269 iov
[niov
].iov_base
= &pad_bytes
;
2270 iov
[niov
++].iov_len
= padding
;
2272 pr_debug("Receiving %u additional bytes"
2273 " for padding.\n", padding
);
2275 if (conn
->conn_ops
->DataDigest
) {
2276 iov
[niov
].iov_base
= &checksum
;
2277 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2278 rx_size
+= ISCSI_CRC_LEN
;
2281 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2282 if (rx_got
!= rx_size
)
2285 if (conn
->conn_ops
->DataDigest
) {
2286 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
2287 text_in
, payload_length
,
2288 padding
, (u8
*)&pad_bytes
,
2291 if (checksum
!= data_crc
) {
2292 pr_err("Text data CRC32C DataDigest"
2293 " 0x%08x does not match computed"
2294 " 0x%08x\n", checksum
, data_crc
);
2295 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2296 pr_err("Unable to recover from"
2297 " Text Data digest failure while in"
2302 * Silently drop this PDU and let the
2303 * initiator plug the CmdSN gap.
2305 pr_debug("Dropping Text"
2306 " Command CmdSN: 0x%08x due to"
2307 " DataCRC error.\n", hdr
->cmdsn
);
2312 pr_debug("Got CRC32C DataDigest"
2313 " 0x%08x for %u bytes of text data.\n",
2314 checksum
, payload_length
);
2317 text_in
[payload_length
- 1] = '\0';
2318 pr_debug("Successfully read %d bytes of text"
2319 " data.\n", payload_length
);
2322 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2325 kfree(cmd
->text_in_ptr
);
2326 cmd
->text_in_ptr
= NULL
;
2327 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2330 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2332 struct iscsi_conn
*conn_p
;
2333 struct iscsi_session
*sess
= conn
->sess
;
2335 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2336 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2338 atomic_set(&sess
->session_logout
, 1);
2339 atomic_set(&conn
->conn_logout_remove
, 1);
2340 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2342 iscsit_inc_conn_usage_count(conn
);
2343 iscsit_inc_session_usage_count(sess
);
2345 spin_lock_bh(&sess
->conn_lock
);
2346 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2347 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2350 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2351 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2353 spin_unlock_bh(&sess
->conn_lock
);
2355 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2360 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2362 struct iscsi_conn
*l_conn
;
2363 struct iscsi_session
*sess
= conn
->sess
;
2365 pr_debug("Received logout request CLOSECONNECTION for CID:"
2366 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2369 * A Logout Request with a CLOSECONNECTION reason code for a CID
2370 * can arrive on a connection with a differing CID.
2372 if (conn
->cid
== cmd
->logout_cid
) {
2373 spin_lock_bh(&conn
->state_lock
);
2374 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2375 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2377 atomic_set(&conn
->conn_logout_remove
, 1);
2378 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2379 iscsit_inc_conn_usage_count(conn
);
2381 spin_unlock_bh(&conn
->state_lock
);
2384 * Handle all different cid CLOSECONNECTION requests in
2385 * iscsit_logout_post_handler_diffcid() as to give enough
2386 * time for any non immediate command's CmdSN to be
2387 * acknowledged on the connection in question.
2389 * Here we simply make sure the CID is still around.
2391 l_conn
= iscsit_get_conn_from_cid(sess
,
2394 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2395 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2400 iscsit_dec_conn_usage_count(l_conn
);
2403 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2410 struct iscsi_session
*sess
= conn
->sess
;
2412 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2413 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2415 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2416 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2417 " while ERL!=2.\n");
2418 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2419 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2423 if (conn
->cid
== cmd
->logout_cid
) {
2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2425 " with CID: %hu on CID: %hu, implementation error.\n",
2426 cmd
->logout_cid
, conn
->cid
);
2427 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2428 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2432 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2438 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2441 int cmdsn_ret
, logout_remove
= 0;
2443 struct iscsi_logout
*hdr
;
2444 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2446 hdr
= (struct iscsi_logout
*) buf
;
2447 reason_code
= (hdr
->flags
& 0x7f);
2450 spin_lock(&tiqn
->logout_stats
.lock
);
2451 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2452 tiqn
->logout_stats
.normal_logouts
++;
2454 tiqn
->logout_stats
.abnormal_logouts
++;
2455 spin_unlock(&tiqn
->logout_stats
.lock
);
2458 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2459 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2460 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2461 hdr
->cid
, conn
->cid
);
2463 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2464 pr_err("Received logout request on connection that"
2465 " is not in logged in state, ignoring request.\n");
2466 iscsit_free_cmd(cmd
, false);
2470 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2471 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2472 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2473 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2474 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2475 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2476 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2477 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2478 cmd
->logout_reason
= reason_code
;
2479 cmd
->data_direction
= DMA_NONE
;
2482 * We need to sleep in these cases (by returning 1) until the Logout
2483 * Response gets sent in the tx thread.
2485 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2486 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2487 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2490 spin_lock_bh(&conn
->cmd_lock
);
2491 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2492 spin_unlock_bh(&conn
->cmd_lock
);
2494 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2495 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2498 * Immediate commands are executed, well, immediately.
2499 * Non-Immediate Logout Commands are executed in CmdSN order.
2501 if (cmd
->immediate_cmd
) {
2502 int ret
= iscsit_execute_cmd(cmd
, 0);
2507 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2508 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2510 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2514 return logout_remove
;
2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2518 int iscsit_handle_snack(
2519 struct iscsi_conn
*conn
,
2522 struct iscsi_snack
*hdr
;
2524 hdr
= (struct iscsi_snack
*) buf
;
2525 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2527 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2528 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2529 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2530 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2532 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2533 pr_err("Initiator sent SNACK request while in"
2534 " ErrorRecoveryLevel=0.\n");
2535 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2539 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2540 * call from inside iscsi_send_recovery_datain_or_r2t().
2542 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2544 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2546 be32_to_cpu(hdr
->ttt
),
2547 be32_to_cpu(hdr
->begrun
),
2548 be32_to_cpu(hdr
->runlength
));
2549 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2550 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2551 be32_to_cpu(hdr
->ttt
),
2552 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2553 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2554 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2555 be32_to_cpu(hdr
->begrun
),
2556 be32_to_cpu(hdr
->runlength
));
2557 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2558 /* FIXME: Support R-Data SNACK */
2559 pr_err("R-Data SNACK Not Supported.\n");
2560 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2563 pr_err("Unknown SNACK type 0x%02x, protocol"
2564 " error.\n", hdr
->flags
& 0x0f);
2565 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2571 EXPORT_SYMBOL(iscsit_handle_snack
);
2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2575 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2576 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2577 wait_for_completion_interruptible_timeout(
2578 &conn
->rx_half_close_comp
,
2579 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2583 static int iscsit_handle_immediate_data(
2584 struct iscsi_cmd
*cmd
,
2585 struct iscsi_scsi_req
*hdr
,
2588 int iov_ret
, rx_got
= 0, rx_size
= 0;
2589 u32 checksum
, iov_count
= 0, padding
= 0;
2590 struct iscsi_conn
*conn
= cmd
->conn
;
2593 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2595 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2598 iov_count
= iov_ret
;
2599 iov
= &cmd
->iov_data
[0];
2601 padding
= ((-length
) & 3);
2603 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2604 iov
[iov_count
++].iov_len
= padding
;
2608 if (conn
->conn_ops
->DataDigest
) {
2609 iov
[iov_count
].iov_base
= &checksum
;
2610 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2611 rx_size
+= ISCSI_CRC_LEN
;
2614 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2616 iscsit_unmap_iovec(cmd
);
2618 if (rx_got
!= rx_size
) {
2619 iscsit_rx_thread_wait_for_tcp(conn
);
2620 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2623 if (conn
->conn_ops
->DataDigest
) {
2626 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
2627 cmd
->write_data_done
, length
, padding
,
2630 if (checksum
!= data_crc
) {
2631 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2632 " does not match computed 0x%08x\n", checksum
,
2635 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2636 pr_err("Unable to recover from"
2637 " Immediate Data digest failure while"
2639 iscsit_reject_cmd(cmd
,
2640 ISCSI_REASON_DATA_DIGEST_ERROR
,
2641 (unsigned char *)hdr
);
2642 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2644 iscsit_reject_cmd(cmd
,
2645 ISCSI_REASON_DATA_DIGEST_ERROR
,
2646 (unsigned char *)hdr
);
2647 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2650 pr_debug("Got CRC32C DataDigest 0x%08x for"
2651 " %u bytes of Immediate Data\n", checksum
,
2656 cmd
->write_data_done
+= length
;
2658 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2659 spin_lock_bh(&cmd
->istate_lock
);
2660 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2661 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2662 spin_unlock_bh(&cmd
->istate_lock
);
2665 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2669 * Called with sess->conn_lock held.
2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2672 with active network interface */
2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2675 struct iscsi_cmd
*cmd
;
2676 struct iscsi_conn
*conn_p
;
2680 * Only send a Asynchronous Message on connections whos network
2681 * interface is still functional.
2683 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2684 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2685 iscsit_inc_conn_usage_count(conn_p
);
2694 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2696 iscsit_dec_conn_usage_count(conn_p
);
2700 cmd
->logout_cid
= conn
->cid
;
2701 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2702 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2704 spin_lock_bh(&conn_p
->cmd_lock
);
2705 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2706 spin_unlock_bh(&conn_p
->cmd_lock
);
2708 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2709 iscsit_dec_conn_usage_count(conn_p
);
2712 static int iscsit_send_conn_drop_async_message(
2713 struct iscsi_cmd
*cmd
,
2714 struct iscsi_conn
*conn
)
2716 struct iscsi_async
*hdr
;
2718 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2720 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2721 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2722 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2723 cmd
->init_task_tag
= RESERVED_ITT
;
2724 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2725 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2726 cmd
->stat_sn
= conn
->stat_sn
++;
2727 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2728 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2729 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2730 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2731 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2732 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2733 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2735 pr_debug("Sending Connection Dropped Async Message StatSN:"
2736 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2737 cmd
->logout_cid
, conn
->cid
);
2739 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2744 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2745 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2746 wait_for_completion_interruptible_timeout(
2747 &conn
->tx_half_close_comp
,
2748 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2753 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2754 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2757 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2758 hdr
->flags
= datain
->flags
;
2759 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2760 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2761 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2762 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2763 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2764 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2765 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2768 hton24(hdr
->dlength
, datain
->length
);
2769 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2770 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2771 (struct scsi_lun
*)&hdr
->lun
);
2773 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2775 hdr
->itt
= cmd
->init_task_tag
;
2777 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2778 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2780 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2782 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2784 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2786 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2787 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2788 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2789 hdr
->offset
= cpu_to_be32(datain
->offset
);
2791 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2792 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2793 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2794 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2796 EXPORT_SYMBOL(iscsit_build_datain_pdu
);
2798 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2800 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2801 struct iscsi_datain datain
;
2802 struct iscsi_datain_req
*dr
;
2804 bool set_statsn
= false;
2806 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2807 dr
= iscsit_get_datain_values(cmd
, &datain
);
2809 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2810 cmd
->init_task_tag
);
2814 * Be paranoid and double check the logic for now.
2816 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2817 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2818 " datain.length: %u exceeds cmd->data_length: %u\n",
2819 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2820 cmd
->se_cmd
.data_length
);
2824 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2826 * Special case for successfully execution w/ both DATAIN
2829 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2830 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2831 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2833 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2834 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2835 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2836 cmd
->stat_sn
= conn
->stat_sn
++;
2838 } else if (dr
->dr_complete
==
2839 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2843 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2845 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, dr
, &datain
, 0);
2849 if (dr
->dr_complete
) {
2850 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2852 iscsit_free_datain_req(cmd
, dr
);
2859 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2860 struct iscsi_logout_rsp
*hdr
)
2862 struct iscsi_conn
*logout_conn
= NULL
;
2863 struct iscsi_conn_recovery
*cr
= NULL
;
2864 struct iscsi_session
*sess
= conn
->sess
;
2866 * The actual shutting down of Sessions and/or Connections
2867 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2868 * is done in scsi_logout_post_handler().
2870 switch (cmd
->logout_reason
) {
2871 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2872 pr_debug("iSCSI session logout successful, setting"
2873 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2874 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2876 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2877 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2880 * For CLOSECONNECTION logout requests carrying
2881 * a matching logout CID -> local CID, the reference
2882 * for the local CID will have been incremented in
2883 * iscsi_logout_closeconnection().
2885 * For CLOSECONNECTION logout requests carrying
2886 * a different CID than the connection it arrived
2887 * on, the connection responding to cmd->logout_cid
2888 * is stopped in iscsit_logout_post_handler_diffcid().
2891 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2892 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2893 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2895 case ISCSI_LOGOUT_REASON_RECOVERY
:
2896 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2897 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2900 * If the connection is still active from our point of view
2901 * force connection recovery to occur.
2903 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2906 iscsit_connection_reinstatement_rcfr(logout_conn
);
2907 iscsit_dec_conn_usage_count(logout_conn
);
2910 cr
= iscsit_get_inactive_connection_recovery_entry(
2911 conn
->sess
, cmd
->logout_cid
);
2913 pr_err("Unable to locate CID: %hu for"
2914 " REMOVECONNFORRECOVERY Logout Request.\n",
2916 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2920 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2922 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2923 " for recovery for CID: %hu on CID: %hu successful.\n",
2924 cmd
->logout_cid
, conn
->cid
);
2925 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2928 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2929 cmd
->logout_reason
);
2933 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2934 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2935 hdr
->response
= cmd
->logout_response
;
2936 hdr
->itt
= cmd
->init_task_tag
;
2937 cmd
->stat_sn
= conn
->stat_sn
++;
2938 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2940 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2941 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2942 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2944 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2945 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2946 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2947 cmd
->logout_cid
, conn
->cid
);
2951 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2954 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2958 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2959 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2963 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2967 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2968 struct iscsi_nopin
*hdr
, bool nopout_response
)
2970 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2971 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2972 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2973 if (nopout_response
)
2974 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2975 hdr
->itt
= cmd
->init_task_tag
;
2976 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2977 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2979 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2981 if (nopout_response
)
2982 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2984 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2985 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2987 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2988 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2989 "Solicited" : "Unsolicited", cmd
->init_task_tag
,
2990 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
2995 * Unsolicited NOPIN, either requesting a response or not.
2997 static int iscsit_send_unsolicited_nopin(
2998 struct iscsi_cmd
*cmd
,
2999 struct iscsi_conn
*conn
,
3002 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3005 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
3007 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3008 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
3010 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3014 spin_lock_bh(&cmd
->istate_lock
);
3015 cmd
->i_state
= want_response
?
3016 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
3017 spin_unlock_bh(&cmd
->istate_lock
);
3023 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3025 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3027 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
3030 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3031 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3033 pr_debug("Echoing back %u bytes of ping data.\n", cmd
->buf_ptr_size
);
3035 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3040 static int iscsit_send_r2t(
3041 struct iscsi_cmd
*cmd
,
3042 struct iscsi_conn
*conn
)
3044 struct iscsi_r2t
*r2t
;
3045 struct iscsi_r2t_rsp
*hdr
;
3048 r2t
= iscsit_get_r2t_from_list(cmd
);
3052 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3053 memset(hdr
, 0, ISCSI_HDR_LEN
);
3054 hdr
->opcode
= ISCSI_OP_R2T
;
3055 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3056 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3057 (struct scsi_lun
*)&hdr
->lun
);
3058 hdr
->itt
= cmd
->init_task_tag
;
3059 if (conn
->conn_transport
->iscsit_get_r2t_ttt
)
3060 conn
->conn_transport
->iscsit_get_r2t_ttt(conn
, cmd
, r2t
);
3062 r2t
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3063 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3064 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3065 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3066 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3067 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3068 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3069 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3071 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3072 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3073 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3074 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3075 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3077 spin_lock_bh(&cmd
->r2t_lock
);
3079 spin_unlock_bh(&cmd
->r2t_lock
);
3081 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3086 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3087 iscsit_start_dataout_timer(cmd
, conn
);
3088 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3094 * @recovery: If called from iscsi_task_reassign_complete_write() for
3095 * connection recovery.
3097 int iscsit_build_r2ts_for_cmd(
3098 struct iscsi_conn
*conn
,
3099 struct iscsi_cmd
*cmd
,
3103 u32 offset
= 0, xfer_len
= 0;
3105 spin_lock_bh(&cmd
->r2t_lock
);
3106 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3107 spin_unlock_bh(&cmd
->r2t_lock
);
3111 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3113 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3115 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3116 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3117 offset
= cmd
->r2t_offset
;
3119 if (first_r2t
&& recovery
) {
3120 int new_data_end
= offset
+
3121 conn
->sess
->sess_ops
->MaxBurstLength
-
3122 cmd
->next_burst_len
;
3124 if (new_data_end
> cmd
->se_cmd
.data_length
)
3125 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3128 conn
->sess
->sess_ops
->MaxBurstLength
-
3129 cmd
->next_burst_len
;
3131 int new_data_end
= offset
+
3132 conn
->sess
->sess_ops
->MaxBurstLength
;
3134 if (new_data_end
> cmd
->se_cmd
.data_length
)
3135 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3137 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3139 cmd
->r2t_offset
+= xfer_len
;
3141 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3142 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3144 struct iscsi_seq
*seq
;
3146 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3148 spin_unlock_bh(&cmd
->r2t_lock
);
3152 offset
= seq
->offset
;
3153 xfer_len
= seq
->xfer_len
;
3155 if (cmd
->seq_send_order
== cmd
->seq_count
)
3156 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3158 cmd
->outstanding_r2ts
++;
3161 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3162 spin_unlock_bh(&cmd
->r2t_lock
);
3166 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3169 spin_unlock_bh(&cmd
->r2t_lock
);
3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd
);
3175 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3176 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3179 cmd
->stat_sn
= conn
->stat_sn
++;
3181 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3183 memset(hdr
, 0, ISCSI_HDR_LEN
);
3184 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3185 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3186 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3187 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3188 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3189 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3190 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3191 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3193 hdr
->response
= cmd
->iscsi_response
;
3194 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3195 hdr
->itt
= cmd
->init_task_tag
;
3196 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3198 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3199 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3200 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3202 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3203 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3204 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3205 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3209 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3211 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3212 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3213 void *data_buf
= NULL
;
3214 u32 padding
= 0, data_buf_len
= 0;
3216 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3219 * Attach SENSE DATA payload to iSCSI Response PDU
3221 if (cmd
->se_cmd
.sense_buffer
&&
3222 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3223 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3224 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3225 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3227 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3228 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3229 data_buf
= cmd
->sense_buffer
;
3230 data_buf_len
= cmd
->se_cmd
.scsi_sense_length
+ padding
;
3233 memset(cmd
->sense_buffer
+
3234 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3235 pr_debug("Adding %u bytes of padding to"
3236 " SENSE.\n", padding
);
3239 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3241 cmd
->se_cmd
.scsi_sense_length
);
3244 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, data_buf
,
3248 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3250 switch (se_tmr
->response
) {
3251 case TMR_FUNCTION_COMPLETE
:
3252 return ISCSI_TMF_RSP_COMPLETE
;
3253 case TMR_TASK_DOES_NOT_EXIST
:
3254 return ISCSI_TMF_RSP_NO_TASK
;
3255 case TMR_LUN_DOES_NOT_EXIST
:
3256 return ISCSI_TMF_RSP_NO_LUN
;
3257 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3258 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3259 case TMR_FUNCTION_REJECTED
:
3261 return ISCSI_TMF_RSP_REJECTED
;
3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3267 struct iscsi_tm_rsp
*hdr
)
3269 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3271 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3272 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3273 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3274 hdr
->itt
= cmd
->init_task_tag
;
3275 cmd
->stat_sn
= conn
->stat_sn
++;
3276 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3278 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3279 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3280 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3282 pr_debug("Built Task Management Response ITT: 0x%08x,"
3283 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3284 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3291 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3293 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3295 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3298 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3302 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3303 const struct sockaddr_in6 sin6
= {
3304 .sin6_addr
= IN6ADDR_ANY_INIT
};
3305 struct sockaddr_in6
*sock_in6
=
3306 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3308 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3309 sin6
.sin6_addr
.s6_addr
, 16))
3312 struct sockaddr_in
* sock_in
=
3313 (struct sockaddr_in
*)&np
->np_sockaddr
;
3315 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3322 #define SENDTARGETS_BUF_LIMIT 32768U
3325 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3326 enum iscsit_transport_type network_transport
,
3327 int skip_bytes
, bool *completed
)
3329 char *payload
= NULL
;
3330 struct iscsi_conn
*conn
= cmd
->conn
;
3331 struct iscsi_portal_group
*tpg
;
3332 struct iscsi_tiqn
*tiqn
;
3333 struct iscsi_tpg_np
*tpg_np
;
3334 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3335 int target_name_printed
;
3336 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3337 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3340 buffer_len
= min(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3341 SENDTARGETS_BUF_LIMIT
);
3343 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3348 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3351 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3352 text_ptr
= strchr(text_in
, '=');
3354 pr_err("Unable to locate '=' string in text_in:"
3360 * Skip over '=' character..
3365 spin_lock(&tiqn_lock
);
3366 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3367 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3368 strcmp(tiqn
->tiqn
, text_ptr
)) {
3372 target_name_printed
= 0;
3374 spin_lock(&tiqn
->tiqn_tpg_lock
);
3375 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3377 /* If demo_mode_discovery=0 and generate_node_acls=0
3378 * (demo mode dislabed) do not return
3379 * TargetName+TargetAddress unless a NodeACL exists.
3382 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3383 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3384 (!target_tpg_has_node_acl(&tpg
->tpg_se_tpg
,
3385 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3389 spin_lock(&tpg
->tpg_state_lock
);
3390 active
= (tpg
->tpg_state
== TPG_STATE_ACTIVE
);
3391 spin_unlock(&tpg
->tpg_state_lock
);
3393 if (!active
&& tpg
->tpg_attrib
.tpg_enabled_sendtargets
)
3396 spin_lock(&tpg
->tpg_np_lock
);
3397 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3399 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3400 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3401 struct sockaddr_storage
*sockaddr
;
3403 if (np
->np_network_transport
!= network_transport
)
3406 if (!target_name_printed
) {
3407 len
= sprintf(buf
, "TargetName=%s",
3411 if ((len
+ payload_len
) > buffer_len
) {
3412 spin_unlock(&tpg
->tpg_np_lock
);
3413 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3418 if (skip_bytes
&& len
<= skip_bytes
) {
3421 memcpy(payload
+ payload_len
, buf
, len
);
3423 target_name_printed
= 1;
3424 if (len
> skip_bytes
)
3430 sockaddr
= &conn
->local_sockaddr
;
3432 sockaddr
= &np
->np_sockaddr
;
3434 len
= sprintf(buf
, "TargetAddress="
3440 if ((len
+ payload_len
) > buffer_len
) {
3441 spin_unlock(&tpg
->tpg_np_lock
);
3442 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3447 if (skip_bytes
&& len
<= skip_bytes
) {
3450 memcpy(payload
+ payload_len
, buf
, len
);
3452 if (len
> skip_bytes
)
3456 spin_unlock(&tpg
->tpg_np_lock
);
3458 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3465 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3468 spin_unlock(&tiqn_lock
);
3470 cmd
->buf_ptr
= payload
;
3476 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3477 struct iscsi_text_rsp
*hdr
,
3478 enum iscsit_transport_type network_transport
)
3480 int text_length
, padding
;
3481 bool completed
= true;
3483 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
,
3484 cmd
->read_data_done
,
3486 if (text_length
< 0)
3490 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3492 hdr
->flags
|= ISCSI_FLAG_TEXT_CONTINUE
;
3493 cmd
->read_data_done
+= text_length
;
3494 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
3495 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3497 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3498 padding
= ((-text_length
) & 3);
3499 hton24(hdr
->dlength
, text_length
);
3500 hdr
->itt
= cmd
->init_task_tag
;
3501 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3502 cmd
->stat_sn
= conn
->stat_sn
++;
3503 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3505 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3507 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3508 * correctly increment MaxCmdSN for each response answering a
3509 * non immediate text request with a valid CmdSN.
3511 cmd
->maxcmdsn_inc
= 0;
3512 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3513 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3515 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3516 " Length: %u, CID: %hu F: %d C: %d\n", cmd
->init_task_tag
,
3517 cmd
->targ_xfer_tag
, cmd
->stat_sn
, text_length
, conn
->cid
,
3518 !!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
),
3519 !!(hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
));
3521 return text_length
+ padding
;
3523 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3525 static int iscsit_send_text_rsp(
3526 struct iscsi_cmd
*cmd
,
3527 struct iscsi_conn
*conn
)
3529 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3532 text_length
= iscsit_build_text_rsp(cmd
, conn
, hdr
,
3533 conn
->conn_transport
->transport_type
);
3534 if (text_length
< 0)
3537 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3543 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3544 struct iscsi_reject
*hdr
)
3546 hdr
->opcode
= ISCSI_OP_REJECT
;
3547 hdr
->reason
= cmd
->reject_reason
;
3548 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3549 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3550 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3551 cmd
->stat_sn
= conn
->stat_sn
++;
3552 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3553 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3554 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3557 EXPORT_SYMBOL(iscsit_build_reject
);
3559 static int iscsit_send_reject(
3560 struct iscsi_cmd
*cmd
,
3561 struct iscsi_conn
*conn
)
3563 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3565 iscsit_build_reject(cmd
, conn
, hdr
);
3567 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3568 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3570 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3575 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3579 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3580 * within iscsit_start_kthreads()
3582 * Here we use bitmap_id to determine which CPU that this
3583 * iSCSI connection's RX/TX threads will be scheduled to
3586 ord
= conn
->bitmap_id
% cpumask_weight(cpu_online_mask
);
3587 for_each_online_cpu(cpu
) {
3589 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3594 * This should never be reached..
3597 cpumask_setall(conn
->conn_cpumask
);
3601 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3606 case ISTATE_SEND_R2T
:
3607 ret
= iscsit_send_r2t(cmd
, conn
);
3612 spin_lock_bh(&conn
->cmd_lock
);
3613 list_del_init(&cmd
->i_conn_node
);
3614 spin_unlock_bh(&conn
->cmd_lock
);
3616 iscsit_free_cmd(cmd
, false);
3618 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3619 iscsit_mod_nopin_response_timer(conn
);
3620 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3624 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3625 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3630 pr_err("Unknown Opcode: 0x%02x ITT:"
3631 " 0x%08x, i_state: %d on CID: %hu\n",
3632 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3642 EXPORT_SYMBOL(iscsit_immediate_queue
);
3645 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3647 struct iscsit_transport
*t
= conn
->conn_transport
;
3648 struct iscsi_queue_req
*qr
;
3649 struct iscsi_cmd
*cmd
;
3653 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3654 atomic_set(&conn
->check_immediate_queue
, 0);
3657 kmem_cache_free(lio_qr_cache
, qr
);
3659 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3668 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3674 case ISTATE_SEND_DATAIN
:
3675 ret
= iscsit_send_datain(cmd
, conn
);
3680 goto check_rsp_state
;
3681 else if (ret
== 1) {
3683 spin_lock_bh(&cmd
->istate_lock
);
3684 cmd
->i_state
= ISTATE_SENT_STATUS
;
3685 spin_unlock_bh(&cmd
->istate_lock
);
3687 if (atomic_read(&conn
->check_immediate_queue
))
3691 } else if (ret
== 2) {
3692 /* Still must send status,
3693 SCF_TRANSPORT_TASK_SENSE was set */
3694 spin_lock_bh(&cmd
->istate_lock
);
3695 cmd
->i_state
= ISTATE_SEND_STATUS
;
3696 spin_unlock_bh(&cmd
->istate_lock
);
3697 state
= ISTATE_SEND_STATUS
;
3698 goto check_rsp_state
;
3702 case ISTATE_SEND_STATUS
:
3703 case ISTATE_SEND_STATUS_RECOVERY
:
3704 ret
= iscsit_send_response(cmd
, conn
);
3706 case ISTATE_SEND_LOGOUTRSP
:
3707 ret
= iscsit_send_logout(cmd
, conn
);
3709 case ISTATE_SEND_ASYNCMSG
:
3710 ret
= iscsit_send_conn_drop_async_message(
3713 case ISTATE_SEND_NOPIN
:
3714 ret
= iscsit_send_nopin(cmd
, conn
);
3716 case ISTATE_SEND_REJECT
:
3717 ret
= iscsit_send_reject(cmd
, conn
);
3719 case ISTATE_SEND_TASKMGTRSP
:
3720 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3723 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3725 iscsit_fall_back_to_erl0(conn
->sess
);
3727 case ISTATE_SEND_TEXTRSP
:
3728 ret
= iscsit_send_text_rsp(cmd
, conn
);
3731 pr_err("Unknown Opcode: 0x%02x ITT:"
3732 " 0x%08x, i_state: %d on CID: %hu\n",
3733 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3741 case ISTATE_SEND_LOGOUTRSP
:
3742 if (!iscsit_logout_post_handler(cmd
, conn
))
3745 case ISTATE_SEND_STATUS
:
3746 case ISTATE_SEND_ASYNCMSG
:
3747 case ISTATE_SEND_NOPIN
:
3748 case ISTATE_SEND_STATUS_RECOVERY
:
3749 case ISTATE_SEND_TEXTRSP
:
3750 case ISTATE_SEND_TASKMGTRSP
:
3751 case ISTATE_SEND_REJECT
:
3752 spin_lock_bh(&cmd
->istate_lock
);
3753 cmd
->i_state
= ISTATE_SENT_STATUS
;
3754 spin_unlock_bh(&cmd
->istate_lock
);
3757 pr_err("Unknown Opcode: 0x%02x ITT:"
3758 " 0x%08x, i_state: %d on CID: %hu\n",
3759 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3760 cmd
->i_state
, conn
->cid
);
3764 if (atomic_read(&conn
->check_immediate_queue
))
3772 EXPORT_SYMBOL(iscsit_response_queue
);
3774 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3776 struct iscsit_transport
*t
= conn
->conn_transport
;
3777 struct iscsi_queue_req
*qr
;
3778 struct iscsi_cmd
*cmd
;
3782 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3785 kmem_cache_free(lio_qr_cache
, qr
);
3787 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3788 if (ret
== 1 || ret
< 0)
3795 int iscsi_target_tx_thread(void *arg
)
3798 struct iscsi_conn
*conn
= arg
;
3799 bool conn_freed
= false;
3802 * Allow ourselves to be interrupted by SIGINT so that a
3803 * connection recovery / failure event can be triggered externally.
3805 allow_signal(SIGINT
);
3807 while (!kthread_should_stop()) {
3809 * Ensure that both TX and RX per connection kthreads
3810 * are scheduled to run on the same CPU.
3812 iscsit_thread_check_cpumask(conn
, current
, 1);
3814 wait_event_interruptible(conn
->queues_wq
,
3815 !iscsit_conn_all_queues_empty(conn
));
3817 if (signal_pending(current
))
3821 ret
= iscsit_handle_immediate_queue(conn
);
3825 ret
= iscsit_handle_response_queue(conn
);
3828 } else if (ret
== -ECONNRESET
) {
3831 } else if (ret
< 0) {
3838 * Avoid the normal connection failure code-path if this connection
3839 * is still within LOGIN mode, and iscsi_np process context is
3840 * responsible for cleaning up the early connection failure.
3842 if (conn
->conn_state
!= TARG_CONN_STATE_IN_LOGIN
)
3843 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
3846 while (!kthread_should_stop()) {
3853 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
3855 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
3856 struct iscsi_cmd
*cmd
;
3859 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
3860 case ISCSI_OP_SCSI_CMD
:
3861 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3865 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
3867 case ISCSI_OP_SCSI_DATA_OUT
:
3868 ret
= iscsit_handle_data_out(conn
, buf
);
3870 case ISCSI_OP_NOOP_OUT
:
3872 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
3873 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3877 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
3879 case ISCSI_OP_SCSI_TMFUNC
:
3880 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3884 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
3887 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
3888 cmd
= iscsit_find_cmd_from_itt(conn
, hdr
->itt
);
3892 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3897 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
3899 case ISCSI_OP_LOGOUT
:
3900 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3904 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
3906 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3907 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3909 case ISCSI_OP_SNACK
:
3910 ret
= iscsit_handle_snack(conn
, buf
);
3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
3914 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3915 pr_err("Cannot recover from unknown"
3916 " opcode while ERL=0, closing iSCSI connection.\n");
3919 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3920 " closing iSCSI connection.\n");
3927 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
3930 static bool iscsi_target_check_conn_state(struct iscsi_conn
*conn
)
3934 spin_lock_bh(&conn
->state_lock
);
3935 ret
= (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
);
3936 spin_unlock_bh(&conn
->state_lock
);
3941 static void iscsit_get_rx_pdu(struct iscsi_conn
*conn
)
3944 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3945 u32 checksum
= 0, digest
= 0;
3948 while (!kthread_should_stop()) {
3950 * Ensure that both TX and RX per connection kthreads
3951 * are scheduled to run on the same CPU.
3953 iscsit_thread_check_cpumask(conn
, current
, 0);
3955 memset(buffer
, 0, ISCSI_HDR_LEN
);
3956 memset(&iov
, 0, sizeof(struct kvec
));
3958 iov
.iov_base
= buffer
;
3959 iov
.iov_len
= ISCSI_HDR_LEN
;
3961 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3962 if (ret
!= ISCSI_HDR_LEN
) {
3963 iscsit_rx_thread_wait_for_tcp(conn
);
3967 if (conn
->conn_ops
->HeaderDigest
) {
3968 iov
.iov_base
= &digest
;
3969 iov
.iov_len
= ISCSI_CRC_LEN
;
3971 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3972 if (ret
!= ISCSI_CRC_LEN
) {
3973 iscsit_rx_thread_wait_for_tcp(conn
);
3977 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
3978 buffer
, ISCSI_HDR_LEN
,
3979 0, NULL
, (u8
*)&checksum
);
3981 if (digest
!= checksum
) {
3982 pr_err("HeaderDigest CRC32C failed,"
3983 " received 0x%08x, computed 0x%08x\n",
3986 * Set the PDU to 0xff so it will intentionally
3987 * hit default in the switch below.
3989 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3990 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
3992 pr_debug("Got HeaderDigest CRC32C"
3993 " 0x%08x\n", checksum
);
3997 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
4000 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
4002 if (conn
->sess
->sess_ops
->SessionType
&&
4003 ((!(opcode
& ISCSI_OP_TEXT
)) ||
4004 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
4005 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4006 " while in Discovery Session, rejecting.\n", opcode
);
4007 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
4012 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4018 int iscsi_target_rx_thread(void *arg
)
4021 struct iscsi_conn
*conn
= arg
;
4022 bool conn_freed
= false;
4025 * Allow ourselves to be interrupted by SIGINT so that a
4026 * connection recovery / failure event can be triggered externally.
4028 allow_signal(SIGINT
);
4030 * Wait for iscsi_post_login_handler() to complete before allowing
4031 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4033 rc
= wait_for_completion_interruptible(&conn
->rx_login_comp
);
4034 if (rc
< 0 || iscsi_target_check_conn_state(conn
))
4037 if (!conn
->conn_transport
->iscsit_get_rx_pdu
)
4040 conn
->conn_transport
->iscsit_get_rx_pdu(conn
);
4042 if (!signal_pending(current
))
4043 atomic_set(&conn
->transport_failed
, 1);
4044 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
4048 while (!kthread_should_stop()) {
4056 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4058 LIST_HEAD(tmp_list
);
4059 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4060 struct iscsi_session
*sess
= conn
->sess
;
4062 * We expect this function to only ever be called from either RX or TX
4063 * thread context via iscsit_close_connection() once the other context
4064 * has been reset -> returned sleeping pre-handler state.
4066 spin_lock_bh(&conn
->cmd_lock
);
4067 list_splice_init(&conn
->conn_cmd_list
, &tmp_list
);
4069 list_for_each_entry(cmd
, &tmp_list
, i_conn_node
) {
4070 struct se_cmd
*se_cmd
= &cmd
->se_cmd
;
4072 if (se_cmd
->se_tfo
!= NULL
) {
4073 spin_lock(&se_cmd
->t_state_lock
);
4074 se_cmd
->transport_state
|= CMD_T_FABRIC_STOP
;
4075 spin_unlock(&se_cmd
->t_state_lock
);
4078 spin_unlock_bh(&conn
->cmd_lock
);
4080 list_for_each_entry_safe(cmd
, cmd_tmp
, &tmp_list
, i_conn_node
) {
4081 list_del_init(&cmd
->i_conn_node
);
4083 iscsit_increment_maxcmdsn(cmd
, sess
);
4084 iscsit_free_cmd(cmd
, true);
4089 static void iscsit_stop_timers_for_cmds(
4090 struct iscsi_conn
*conn
)
4092 struct iscsi_cmd
*cmd
;
4094 spin_lock_bh(&conn
->cmd_lock
);
4095 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4096 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4097 iscsit_stop_dataout_timer(cmd
);
4099 spin_unlock_bh(&conn
->cmd_lock
);
4102 int iscsit_close_connection(
4103 struct iscsi_conn
*conn
)
4105 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4106 struct iscsi_session
*sess
= conn
->sess
;
4108 pr_debug("Closing iSCSI connection CID %hu on SID:"
4109 " %u\n", conn
->cid
, sess
->sid
);
4111 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4112 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4113 * sleeping and the logout response never got sent because the
4114 * connection failed.
4116 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4117 * to signal logout response TX interrupt completion. Go ahead and skip
4118 * this for iser since isert_rx_opcode() does not wait on logout failure,
4119 * and to avoid iscsi_conn pointer dereference in iser-target code.
4121 if (!conn
->conn_transport
->rdma_shutdown
)
4122 complete(&conn
->conn_logout_comp
);
4124 if (!strcmp(current
->comm
, ISCSI_RX_THREAD_NAME
)) {
4125 if (conn
->tx_thread
&&
4126 cmpxchg(&conn
->tx_thread_active
, true, false)) {
4127 send_sig(SIGINT
, conn
->tx_thread
, 1);
4128 kthread_stop(conn
->tx_thread
);
4130 } else if (!strcmp(current
->comm
, ISCSI_TX_THREAD_NAME
)) {
4131 if (conn
->rx_thread
&&
4132 cmpxchg(&conn
->rx_thread_active
, true, false)) {
4133 send_sig(SIGINT
, conn
->rx_thread
, 1);
4134 kthread_stop(conn
->rx_thread
);
4138 spin_lock(&iscsit_global
->ts_bitmap_lock
);
4139 bitmap_release_region(iscsit_global
->ts_bitmap
, conn
->bitmap_id
,
4141 spin_unlock(&iscsit_global
->ts_bitmap_lock
);
4143 iscsit_stop_timers_for_cmds(conn
);
4144 iscsit_stop_nopin_response_timer(conn
);
4145 iscsit_stop_nopin_timer(conn
);
4147 if (conn
->conn_transport
->iscsit_wait_conn
)
4148 conn
->conn_transport
->iscsit_wait_conn(conn
);
4151 * During Connection recovery drop unacknowledged out of order
4152 * commands for this connection, and prepare the other commands
4155 * During normal operation clear the out of order commands (but
4156 * do not free the struct iscsi_ooo_cmdsn's) and release all
4157 * struct iscsi_cmds.
4159 if (atomic_read(&conn
->connection_recovery
)) {
4160 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4161 iscsit_prepare_cmds_for_reallegiance(conn
);
4163 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4164 iscsit_release_commands_from_conn(conn
);
4166 iscsit_free_queue_reqs_for_conn(conn
);
4169 * Handle decrementing session or connection usage count if
4170 * a logout response was not able to be sent because the
4171 * connection failed. Fall back to Session Recovery here.
4173 if (atomic_read(&conn
->conn_logout_remove
)) {
4174 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4175 iscsit_dec_conn_usage_count(conn
);
4176 iscsit_dec_session_usage_count(sess
);
4178 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4179 iscsit_dec_conn_usage_count(conn
);
4181 atomic_set(&conn
->conn_logout_remove
, 0);
4182 atomic_set(&sess
->session_reinstatement
, 0);
4183 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4186 spin_lock_bh(&sess
->conn_lock
);
4187 list_del(&conn
->conn_list
);
4190 * Attempt to let the Initiator know this connection failed by
4191 * sending an Connection Dropped Async Message on another
4192 * active connection.
4194 if (atomic_read(&conn
->connection_recovery
))
4195 iscsit_build_conn_drop_async_message(conn
);
4197 spin_unlock_bh(&sess
->conn_lock
);
4200 * If connection reinstatement is being performed on this connection,
4201 * up the connection reinstatement semaphore that is being blocked on
4202 * in iscsit_cause_connection_reinstatement().
4204 spin_lock_bh(&conn
->state_lock
);
4205 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4206 spin_unlock_bh(&conn
->state_lock
);
4207 complete(&conn
->conn_wait_comp
);
4208 wait_for_completion(&conn
->conn_post_wait_comp
);
4209 spin_lock_bh(&conn
->state_lock
);
4213 * If connection reinstatement is being performed on this connection
4214 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4215 * connection wait rcfr semaphore that is being blocked on
4216 * an iscsit_connection_reinstatement_rcfr().
4218 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4219 spin_unlock_bh(&conn
->state_lock
);
4220 complete(&conn
->conn_wait_rcfr_comp
);
4221 wait_for_completion(&conn
->conn_post_wait_comp
);
4222 spin_lock_bh(&conn
->state_lock
);
4224 atomic_set(&conn
->connection_reinstatement
, 1);
4225 spin_unlock_bh(&conn
->state_lock
);
4228 * If any other processes are accessing this connection pointer we
4229 * must wait until they have completed.
4231 iscsit_check_conn_usage_count(conn
);
4233 ahash_request_free(conn
->conn_tx_hash
);
4234 if (conn
->conn_rx_hash
) {
4235 struct crypto_ahash
*tfm
;
4237 tfm
= crypto_ahash_reqtfm(conn
->conn_rx_hash
);
4238 ahash_request_free(conn
->conn_rx_hash
);
4239 crypto_free_ahash(tfm
);
4242 free_cpumask_var(conn
->conn_cpumask
);
4244 kfree(conn
->conn_ops
);
4245 conn
->conn_ops
= NULL
;
4248 sock_release(conn
->sock
);
4250 if (conn
->conn_transport
->iscsit_free_conn
)
4251 conn
->conn_transport
->iscsit_free_conn(conn
);
4253 iscsit_put_transport(conn
->conn_transport
);
4255 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4256 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4259 spin_lock_bh(&sess
->conn_lock
);
4260 atomic_dec(&sess
->nconn
);
4261 pr_debug("Decremented iSCSI connection count to %hu from node:"
4262 " %s\n", atomic_read(&sess
->nconn
),
4263 sess
->sess_ops
->InitiatorName
);
4265 * Make sure that if one connection fails in an non ERL=2 iSCSI
4266 * Session that they all fail.
4268 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4269 !atomic_read(&sess
->session_logout
))
4270 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4273 * If this was not the last connection in the session, and we are
4274 * performing session reinstatement or falling back to ERL=0, call
4275 * iscsit_stop_session() without sleeping to shutdown the other
4276 * active connections.
4278 if (atomic_read(&sess
->nconn
)) {
4279 if (!atomic_read(&sess
->session_reinstatement
) &&
4280 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4281 spin_unlock_bh(&sess
->conn_lock
);
4284 if (!atomic_read(&sess
->session_stop_active
)) {
4285 atomic_set(&sess
->session_stop_active
, 1);
4286 spin_unlock_bh(&sess
->conn_lock
);
4287 iscsit_stop_session(sess
, 0, 0);
4290 spin_unlock_bh(&sess
->conn_lock
);
4295 * If this was the last connection in the session and one of the
4296 * following is occurring:
4298 * Session Reinstatement is not being performed, and are falling back
4299 * to ERL=0 call iscsit_close_session().
4301 * Session Logout was requested. iscsit_close_session() will be called
4304 * Session Continuation is not being performed, start the Time2Retain
4305 * handler and check if sleep_on_sess_wait_sem is active.
4307 if (!atomic_read(&sess
->session_reinstatement
) &&
4308 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4309 spin_unlock_bh(&sess
->conn_lock
);
4310 iscsit_close_session(sess
);
4313 } else if (atomic_read(&sess
->session_logout
)) {
4314 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4315 sess
->session_state
= TARG_SESS_STATE_FREE
;
4316 spin_unlock_bh(&sess
->conn_lock
);
4318 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4319 complete(&sess
->session_wait_comp
);
4323 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4324 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4326 if (!atomic_read(&sess
->session_continuation
)) {
4327 spin_unlock_bh(&sess
->conn_lock
);
4328 iscsit_start_time2retain_handler(sess
);
4330 spin_unlock_bh(&sess
->conn_lock
);
4332 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4333 complete(&sess
->session_wait_comp
);
4340 * If the iSCSI Session for the iSCSI Initiator Node exists,
4341 * forcefully shutdown the iSCSI NEXUS.
4343 int iscsit_close_session(struct iscsi_session
*sess
)
4345 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4346 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4348 if (atomic_read(&sess
->nconn
)) {
4349 pr_err("%d connection(s) still exist for iSCSI session"
4350 " to %s\n", atomic_read(&sess
->nconn
),
4351 sess
->sess_ops
->InitiatorName
);
4355 spin_lock_bh(&se_tpg
->session_lock
);
4356 atomic_set(&sess
->session_logout
, 1);
4357 atomic_set(&sess
->session_reinstatement
, 1);
4358 iscsit_stop_time2retain_timer(sess
);
4359 spin_unlock_bh(&se_tpg
->session_lock
);
4362 * transport_deregister_session_configfs() will clear the
4363 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4364 * can be setting it again with __transport_register_session() in
4365 * iscsi_post_login_handler() again after the iscsit_stop_session()
4366 * completes in iscsi_np context.
4368 transport_deregister_session_configfs(sess
->se_sess
);
4371 * If any other processes are accessing this session pointer we must
4372 * wait until they have completed. If we are in an interrupt (the
4373 * time2retain handler) and contain and active session usage count we
4374 * restart the timer and exit.
4376 if (!in_interrupt()) {
4377 if (iscsit_check_session_usage_count(sess
) == 1)
4378 iscsit_stop_session(sess
, 1, 1);
4380 if (iscsit_check_session_usage_count(sess
) == 2) {
4381 atomic_set(&sess
->session_logout
, 0);
4382 iscsit_start_time2retain_handler(sess
);
4387 transport_deregister_session(sess
->se_sess
);
4389 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4390 iscsit_free_connection_recovery_entires(sess
);
4392 iscsit_free_all_ooo_cmdsns(sess
);
4394 spin_lock_bh(&se_tpg
->session_lock
);
4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4396 sess
->session_state
= TARG_SESS_STATE_FREE
;
4397 pr_debug("Released iSCSI session from node: %s\n",
4398 sess
->sess_ops
->InitiatorName
);
4401 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4403 pr_debug("Decremented number of active iSCSI Sessions on"
4404 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4406 spin_lock(&sess_idr_lock
);
4407 idr_remove(&sess_idr
, sess
->session_index
);
4408 spin_unlock(&sess_idr_lock
);
4410 kfree(sess
->sess_ops
);
4411 sess
->sess_ops
= NULL
;
4412 spin_unlock_bh(&se_tpg
->session_lock
);
4418 static void iscsit_logout_post_handler_closesession(
4419 struct iscsi_conn
*conn
)
4421 struct iscsi_session
*sess
= conn
->sess
;
4424 * Traditional iscsi/tcp will invoke this logic from TX thread
4425 * context during session logout, so clear tx_thread_active and
4426 * sleep if iscsit_close_connection() has not already occured.
4428 * Since iser-target invokes this logic from it's own workqueue,
4429 * always sleep waiting for RX/TX thread shutdown to complete
4430 * within iscsit_close_connection().
4432 if (!conn
->conn_transport
->rdma_shutdown
) {
4433 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4438 atomic_set(&conn
->conn_logout_remove
, 0);
4439 complete(&conn
->conn_logout_comp
);
4441 iscsit_dec_conn_usage_count(conn
);
4442 iscsit_stop_session(sess
, sleep
, sleep
);
4443 iscsit_dec_session_usage_count(sess
);
4444 iscsit_close_session(sess
);
4447 static void iscsit_logout_post_handler_samecid(
4448 struct iscsi_conn
*conn
)
4452 if (!conn
->conn_transport
->rdma_shutdown
) {
4453 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4458 atomic_set(&conn
->conn_logout_remove
, 0);
4459 complete(&conn
->conn_logout_comp
);
4461 iscsit_cause_connection_reinstatement(conn
, sleep
);
4462 iscsit_dec_conn_usage_count(conn
);
4465 static void iscsit_logout_post_handler_diffcid(
4466 struct iscsi_conn
*conn
,
4469 struct iscsi_conn
*l_conn
;
4470 struct iscsi_session
*sess
= conn
->sess
;
4471 bool conn_found
= false;
4476 spin_lock_bh(&sess
->conn_lock
);
4477 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4478 if (l_conn
->cid
== cid
) {
4479 iscsit_inc_conn_usage_count(l_conn
);
4484 spin_unlock_bh(&sess
->conn_lock
);
4490 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4492 spin_lock_bh(&l_conn
->state_lock
);
4493 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4494 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4495 spin_unlock_bh(&l_conn
->state_lock
);
4497 iscsit_cause_connection_reinstatement(l_conn
, 1);
4498 iscsit_dec_conn_usage_count(l_conn
);
4502 * Return of 0 causes the TX thread to restart.
4504 int iscsit_logout_post_handler(
4505 struct iscsi_cmd
*cmd
,
4506 struct iscsi_conn
*conn
)
4510 switch (cmd
->logout_reason
) {
4511 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4512 switch (cmd
->logout_response
) {
4513 case ISCSI_LOGOUT_SUCCESS
:
4514 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4516 iscsit_logout_post_handler_closesession(conn
);
4521 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4522 if (conn
->cid
== cmd
->logout_cid
) {
4523 switch (cmd
->logout_response
) {
4524 case ISCSI_LOGOUT_SUCCESS
:
4525 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4527 iscsit_logout_post_handler_samecid(conn
);
4532 switch (cmd
->logout_response
) {
4533 case ISCSI_LOGOUT_SUCCESS
:
4534 iscsit_logout_post_handler_diffcid(conn
,
4537 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4538 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4545 case ISCSI_LOGOUT_REASON_RECOVERY
:
4546 switch (cmd
->logout_response
) {
4547 case ISCSI_LOGOUT_SUCCESS
:
4548 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4549 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4550 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4562 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4564 void iscsit_fail_session(struct iscsi_session
*sess
)
4566 struct iscsi_conn
*conn
;
4568 spin_lock_bh(&sess
->conn_lock
);
4569 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4570 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4571 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4573 spin_unlock_bh(&sess
->conn_lock
);
4575 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4576 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4579 int iscsit_free_session(struct iscsi_session
*sess
)
4581 u16 conn_count
= atomic_read(&sess
->nconn
);
4582 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4585 spin_lock_bh(&sess
->conn_lock
);
4586 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4588 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4590 if (conn_count
== 0)
4593 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4596 iscsit_inc_conn_usage_count(conn_tmp
);
4599 iscsit_inc_conn_usage_count(conn
);
4601 spin_unlock_bh(&sess
->conn_lock
);
4602 iscsit_cause_connection_reinstatement(conn
, 1);
4603 spin_lock_bh(&sess
->conn_lock
);
4605 iscsit_dec_conn_usage_count(conn
);
4607 iscsit_dec_conn_usage_count(conn_tmp
);
4612 if (atomic_read(&sess
->nconn
)) {
4613 spin_unlock_bh(&sess
->conn_lock
);
4614 wait_for_completion(&sess
->session_wait_comp
);
4616 spin_unlock_bh(&sess
->conn_lock
);
4618 iscsit_close_session(sess
);
4622 void iscsit_stop_session(
4623 struct iscsi_session
*sess
,
4625 int connection_sleep
)
4627 u16 conn_count
= atomic_read(&sess
->nconn
);
4628 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4631 spin_lock_bh(&sess
->conn_lock
);
4633 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4635 if (connection_sleep
) {
4636 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4638 if (conn_count
== 0)
4641 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4644 iscsit_inc_conn_usage_count(conn_tmp
);
4647 iscsit_inc_conn_usage_count(conn
);
4649 spin_unlock_bh(&sess
->conn_lock
);
4650 iscsit_cause_connection_reinstatement(conn
, 1);
4651 spin_lock_bh(&sess
->conn_lock
);
4653 iscsit_dec_conn_usage_count(conn
);
4655 iscsit_dec_conn_usage_count(conn_tmp
);
4659 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4660 iscsit_cause_connection_reinstatement(conn
, 0);
4663 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4664 spin_unlock_bh(&sess
->conn_lock
);
4665 wait_for_completion(&sess
->session_wait_comp
);
4667 spin_unlock_bh(&sess
->conn_lock
);
4670 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4672 struct iscsi_session
*sess
;
4673 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4674 struct se_session
*se_sess
, *se_sess_tmp
;
4675 LIST_HEAD(free_list
);
4676 int session_count
= 0;
4678 spin_lock_bh(&se_tpg
->session_lock
);
4679 if (tpg
->nsessions
&& !force
) {
4680 spin_unlock_bh(&se_tpg
->session_lock
);
4684 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4686 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4688 spin_lock(&sess
->conn_lock
);
4689 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4690 atomic_read(&sess
->session_logout
) ||
4691 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4692 spin_unlock(&sess
->conn_lock
);
4695 atomic_set(&sess
->session_reinstatement
, 1);
4696 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4697 spin_unlock(&sess
->conn_lock
);
4699 list_move_tail(&se_sess
->sess_list
, &free_list
);
4701 spin_unlock_bh(&se_tpg
->session_lock
);
4703 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &free_list
, sess_list
) {
4704 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4706 iscsit_free_session(sess
);
4710 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4711 " Group: %hu\n", session_count
, tpg
->tpgt
);
4715 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4716 MODULE_VERSION("4.1.x");
4717 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4718 MODULE_LICENSE("GPL");
4720 module_init(iscsi_target_init_module
);
4721 module_exit(iscsi_target_cleanup_module
);