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
;
421 atomic_inc(&np
->np_reset_count
);
424 spin_unlock_bh(&np
->np_thread_lock
);
425 send_sig(SIGINT
, np
->np_thread
, 1);
426 wait_for_completion(&np
->np_restart_comp
);
427 spin_lock_bh(&np
->np_thread_lock
);
429 spin_unlock_bh(&np
->np_thread_lock
);
431 if (tpg_np
&& shutdown
) {
432 kref_put(&tpg_np
->tpg_np_kref
, iscsit_login_kref_put
);
434 wait_for_completion(&tpg_np
->tpg_np_comp
);
440 static void iscsit_free_np(struct iscsi_np
*np
)
443 sock_release(np
->np_socket
);
446 int iscsit_del_np(struct iscsi_np
*np
)
448 spin_lock_bh(&np
->np_thread_lock
);
450 if (np
->np_exports
) {
452 spin_unlock_bh(&np
->np_thread_lock
);
455 np
->np_thread_state
= ISCSI_NP_THREAD_SHUTDOWN
;
456 spin_unlock_bh(&np
->np_thread_lock
);
460 * We need to send the signal to wakeup Linux/Net
461 * which may be sleeping in sock_accept()..
463 send_sig(SIGINT
, np
->np_thread
, 1);
464 kthread_stop(np
->np_thread
);
465 np
->np_thread
= NULL
;
468 np
->np_transport
->iscsit_free_np(np
);
470 mutex_lock(&np_lock
);
471 list_del(&np
->np_list
);
472 mutex_unlock(&np_lock
);
474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
475 &np
->np_sockaddr
, np
->np_transport
->name
);
477 iscsit_put_transport(np
->np_transport
);
482 static void iscsit_get_rx_pdu(struct iscsi_conn
*);
484 int iscsit_queue_rsp(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
486 return iscsit_add_cmd_to_response_queue(cmd
, cmd
->conn
, cmd
->i_state
);
488 EXPORT_SYMBOL(iscsit_queue_rsp
);
490 void iscsit_aborted_task(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
)
492 spin_lock_bh(&conn
->cmd_lock
);
493 if (!list_empty(&cmd
->i_conn_node
) &&
494 !(cmd
->se_cmd
.transport_state
& CMD_T_FABRIC_STOP
))
495 list_del_init(&cmd
->i_conn_node
);
496 spin_unlock_bh(&conn
->cmd_lock
);
498 __iscsit_free_cmd(cmd
, true);
500 EXPORT_SYMBOL(iscsit_aborted_task
);
502 static void iscsit_do_crypto_hash_buf(struct ahash_request
*, const void *,
503 u32
, u32
, u8
*, u8
*);
504 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*);
507 iscsit_xmit_nondatain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
508 const void *data_buf
, u32 data_buf_len
)
510 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)cmd
->pdu
;
512 u32 niov
= 0, tx_size
= ISCSI_HDR_LEN
;
515 iov
= &cmd
->iov_misc
[0];
516 iov
[niov
].iov_base
= cmd
->pdu
;
517 iov
[niov
++].iov_len
= ISCSI_HDR_LEN
;
519 if (conn
->conn_ops
->HeaderDigest
) {
520 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
522 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, hdr
,
523 ISCSI_HDR_LEN
, 0, NULL
,
524 (u8
*)header_digest
);
526 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
527 tx_size
+= ISCSI_CRC_LEN
;
528 pr_debug("Attaching CRC32C HeaderDigest"
529 " to opcode 0x%x 0x%08x\n",
530 hdr
->opcode
, *header_digest
);
534 u32 padding
= ((-data_buf_len
) & 3);
536 iov
[niov
].iov_base
= (void *)data_buf
;
537 iov
[niov
++].iov_len
= data_buf_len
;
538 tx_size
+= data_buf_len
;
541 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
542 iov
[niov
++].iov_len
= padding
;
544 pr_debug("Attaching %u additional"
545 " padding bytes.\n", padding
);
548 if (conn
->conn_ops
->DataDigest
) {
549 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
,
550 data_buf
, data_buf_len
,
552 (u8
*)&cmd
->pad_bytes
,
553 (u8
*)&cmd
->data_crc
);
555 iov
[niov
].iov_base
= &cmd
->data_crc
;
556 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
557 tx_size
+= ISCSI_CRC_LEN
;
558 pr_debug("Attached DataDigest for %u"
559 " bytes opcode 0x%x, CRC 0x%08x\n",
560 data_buf_len
, hdr
->opcode
, cmd
->data_crc
);
564 cmd
->iov_misc_count
= niov
;
565 cmd
->tx_size
= tx_size
;
567 ret
= iscsit_send_tx_data(cmd
, conn
, 1);
569 iscsit_tx_thread_wait_for_tcp(conn
);
576 static int iscsit_map_iovec(struct iscsi_cmd
*, struct kvec
*, u32
, u32
);
577 static void iscsit_unmap_iovec(struct iscsi_cmd
*);
578 static u32
iscsit_do_crypto_hash_sg(struct ahash_request
*, struct iscsi_cmd
*,
579 u32
, u32
, u32
, u8
*);
581 iscsit_xmit_datain_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
582 const struct iscsi_datain
*datain
)
585 u32 iov_count
= 0, tx_size
= 0;
588 iov
= &cmd
->iov_data
[0];
589 iov
[iov_count
].iov_base
= cmd
->pdu
;
590 iov
[iov_count
++].iov_len
= ISCSI_HDR_LEN
;
591 tx_size
+= ISCSI_HDR_LEN
;
593 if (conn
->conn_ops
->HeaderDigest
) {
594 u32
*header_digest
= (u32
*)&cmd
->pdu
[ISCSI_HDR_LEN
];
596 iscsit_do_crypto_hash_buf(conn
->conn_tx_hash
, cmd
->pdu
,
597 ISCSI_HDR_LEN
, 0, NULL
,
598 (u8
*)header_digest
);
600 iov
[0].iov_len
+= ISCSI_CRC_LEN
;
601 tx_size
+= ISCSI_CRC_LEN
;
603 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
607 iov_ret
= iscsit_map_iovec(cmd
, &cmd
->iov_data
[1],
608 datain
->offset
, datain
->length
);
612 iov_count
+= iov_ret
;
613 tx_size
+= datain
->length
;
615 cmd
->padding
= ((-datain
->length
) & 3);
617 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
618 iov
[iov_count
++].iov_len
= cmd
->padding
;
619 tx_size
+= cmd
->padding
;
621 pr_debug("Attaching %u padding bytes\n", cmd
->padding
);
624 if (conn
->conn_ops
->DataDigest
) {
625 cmd
->data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_tx_hash
,
631 iov
[iov_count
].iov_base
= &cmd
->data_crc
;
632 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
633 tx_size
+= ISCSI_CRC_LEN
;
635 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
636 datain
->length
+ cmd
->padding
, cmd
->data_crc
);
639 cmd
->iov_data_count
= iov_count
;
640 cmd
->tx_size
= tx_size
;
642 ret
= iscsit_fe_sendpage_sg(cmd
, conn
);
644 iscsit_unmap_iovec(cmd
);
647 iscsit_tx_thread_wait_for_tcp(conn
);
654 static int iscsit_xmit_pdu(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
655 struct iscsi_datain_req
*dr
, const void *buf
,
659 return iscsit_xmit_datain_pdu(conn
, cmd
, buf
);
661 return iscsit_xmit_nondatain_pdu(conn
, cmd
, buf
, buf_len
);
664 static enum target_prot_op
iscsit_get_sup_prot_ops(struct iscsi_conn
*conn
)
666 return TARGET_PROT_NORMAL
;
669 static struct iscsit_transport iscsi_target_transport
= {
671 .transport_type
= ISCSI_TCP
,
672 .rdma_shutdown
= false,
674 .iscsit_setup_np
= iscsit_setup_np
,
675 .iscsit_accept_np
= iscsit_accept_np
,
676 .iscsit_free_np
= iscsit_free_np
,
677 .iscsit_get_login_rx
= iscsit_get_login_rx
,
678 .iscsit_put_login_tx
= iscsit_put_login_tx
,
679 .iscsit_get_dataout
= iscsit_build_r2ts_for_cmd
,
680 .iscsit_immediate_queue
= iscsit_immediate_queue
,
681 .iscsit_response_queue
= iscsit_response_queue
,
682 .iscsit_queue_data_in
= iscsit_queue_rsp
,
683 .iscsit_queue_status
= iscsit_queue_rsp
,
684 .iscsit_aborted_task
= iscsit_aborted_task
,
685 .iscsit_xmit_pdu
= iscsit_xmit_pdu
,
686 .iscsit_get_rx_pdu
= iscsit_get_rx_pdu
,
687 .iscsit_get_sup_prot_ops
= iscsit_get_sup_prot_ops
,
690 static int __init
iscsi_target_init_module(void)
694 pr_debug("iSCSI-Target "ISCSIT_VERSION
"\n");
695 iscsit_global
= kzalloc(sizeof(*iscsit_global
), GFP_KERNEL
);
699 spin_lock_init(&iscsit_global
->ts_bitmap_lock
);
700 mutex_init(&auth_id_lock
);
701 spin_lock_init(&sess_idr_lock
);
705 ret
= target_register_template(&iscsi_ops
);
709 size
= BITS_TO_LONGS(ISCSIT_BITMAP_BITS
) * sizeof(long);
710 iscsit_global
->ts_bitmap
= vzalloc(size
);
711 if (!iscsit_global
->ts_bitmap
)
714 lio_qr_cache
= kmem_cache_create("lio_qr_cache",
715 sizeof(struct iscsi_queue_req
),
716 __alignof__(struct iscsi_queue_req
), 0, NULL
);
718 pr_err("nable to kmem_cache_create() for"
723 lio_dr_cache
= kmem_cache_create("lio_dr_cache",
724 sizeof(struct iscsi_datain_req
),
725 __alignof__(struct iscsi_datain_req
), 0, NULL
);
727 pr_err("Unable to kmem_cache_create() for"
732 lio_ooo_cache
= kmem_cache_create("lio_ooo_cache",
733 sizeof(struct iscsi_ooo_cmdsn
),
734 __alignof__(struct iscsi_ooo_cmdsn
), 0, NULL
);
735 if (!lio_ooo_cache
) {
736 pr_err("Unable to kmem_cache_create() for"
741 lio_r2t_cache
= kmem_cache_create("lio_r2t_cache",
742 sizeof(struct iscsi_r2t
), __alignof__(struct iscsi_r2t
),
744 if (!lio_r2t_cache
) {
745 pr_err("Unable to kmem_cache_create() for"
750 iscsit_register_transport(&iscsi_target_transport
);
752 if (iscsit_load_discovery_tpg() < 0)
757 iscsit_unregister_transport(&iscsi_target_transport
);
758 kmem_cache_destroy(lio_r2t_cache
);
760 kmem_cache_destroy(lio_ooo_cache
);
762 kmem_cache_destroy(lio_dr_cache
);
764 kmem_cache_destroy(lio_qr_cache
);
766 vfree(iscsit_global
->ts_bitmap
);
768 /* XXX: this probably wants it to be it's own unwind step.. */
769 if (iscsit_global
->discovery_tpg
)
770 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
771 target_unregister_template(&iscsi_ops
);
773 kfree(iscsit_global
);
777 static void __exit
iscsi_target_cleanup_module(void)
779 iscsit_release_discovery_tpg();
780 iscsit_unregister_transport(&iscsi_target_transport
);
781 kmem_cache_destroy(lio_qr_cache
);
782 kmem_cache_destroy(lio_dr_cache
);
783 kmem_cache_destroy(lio_ooo_cache
);
784 kmem_cache_destroy(lio_r2t_cache
);
787 * Shutdown discovery sessions and disable discovery TPG
789 if (iscsit_global
->discovery_tpg
)
790 iscsit_tpg_disable_portal_group(iscsit_global
->discovery_tpg
, 1);
792 target_unregister_template(&iscsi_ops
);
794 vfree(iscsit_global
->ts_bitmap
);
795 kfree(iscsit_global
);
798 int iscsit_add_reject(
799 struct iscsi_conn
*conn
,
803 struct iscsi_cmd
*cmd
;
805 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
809 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
810 cmd
->reject_reason
= reason
;
812 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
814 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
815 iscsit_free_cmd(cmd
, false);
819 spin_lock_bh(&conn
->cmd_lock
);
820 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
821 spin_unlock_bh(&conn
->cmd_lock
);
823 cmd
->i_state
= ISTATE_SEND_REJECT
;
824 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
828 EXPORT_SYMBOL(iscsit_add_reject
);
830 static int iscsit_add_reject_from_cmd(
831 struct iscsi_cmd
*cmd
,
836 struct iscsi_conn
*conn
;
839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
845 cmd
->iscsi_opcode
= ISCSI_OP_REJECT
;
846 cmd
->reject_reason
= reason
;
848 cmd
->buf_ptr
= kmemdup(buf
, ISCSI_HDR_LEN
, GFP_KERNEL
);
850 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
851 iscsit_free_cmd(cmd
, false);
856 spin_lock_bh(&conn
->cmd_lock
);
857 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
858 spin_unlock_bh(&conn
->cmd_lock
);
861 cmd
->i_state
= ISTATE_SEND_REJECT
;
862 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
864 * Perform the kref_put now if se_cmd has already been setup by
865 * scsit_setup_scsi_cmd()
867 if (cmd
->se_cmd
.se_tfo
!= NULL
) {
868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
869 target_put_sess_cmd(&cmd
->se_cmd
);
874 static int iscsit_add_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
,
877 return iscsit_add_reject_from_cmd(cmd
, reason
, true, buf
);
880 int iscsit_reject_cmd(struct iscsi_cmd
*cmd
, u8 reason
, unsigned char *buf
)
882 return iscsit_add_reject_from_cmd(cmd
, reason
, false, buf
);
884 EXPORT_SYMBOL(iscsit_reject_cmd
);
887 * Map some portion of the allocated scatterlist to an iovec, suitable for
888 * kernel sockets to copy data in/out.
890 static int iscsit_map_iovec(
891 struct iscsi_cmd
*cmd
,
897 struct scatterlist
*sg
;
898 unsigned int page_off
;
901 * We know each entry in t_data_sg contains a page.
903 u32 ent
= data_offset
/ PAGE_SIZE
;
905 if (ent
>= cmd
->se_cmd
.t_data_nents
) {
906 pr_err("Initial page entry out-of-bounds\n");
910 sg
= &cmd
->se_cmd
.t_data_sg
[ent
];
911 page_off
= (data_offset
% PAGE_SIZE
);
913 cmd
->first_data_sg
= sg
;
914 cmd
->first_data_sg_off
= page_off
;
916 while (data_length
) {
917 u32 cur_len
= min_t(u32
, data_length
, sg
->length
- page_off
);
919 iov
[i
].iov_base
= kmap(sg_page(sg
)) + sg
->offset
+ page_off
;
920 iov
[i
].iov_len
= cur_len
;
922 data_length
-= cur_len
;
928 cmd
->kmapped_nents
= i
;
933 static void iscsit_unmap_iovec(struct iscsi_cmd
*cmd
)
936 struct scatterlist
*sg
;
938 sg
= cmd
->first_data_sg
;
940 for (i
= 0; i
< cmd
->kmapped_nents
; i
++)
941 kunmap(sg_page(&sg
[i
]));
944 static void iscsit_ack_from_expstatsn(struct iscsi_conn
*conn
, u32 exp_statsn
)
947 struct iscsi_cmd
*cmd
, *cmd_p
;
949 conn
->exp_statsn
= exp_statsn
;
951 if (conn
->sess
->sess_ops
->RDMAExtensions
)
954 spin_lock_bh(&conn
->cmd_lock
);
955 list_for_each_entry_safe(cmd
, cmd_p
, &conn
->conn_cmd_list
, i_conn_node
) {
956 spin_lock(&cmd
->istate_lock
);
957 if ((cmd
->i_state
== ISTATE_SENT_STATUS
) &&
958 iscsi_sna_lt(cmd
->stat_sn
, exp_statsn
)) {
959 cmd
->i_state
= ISTATE_REMOVE
;
960 spin_unlock(&cmd
->istate_lock
);
961 list_move_tail(&cmd
->i_conn_node
, &ack_list
);
964 spin_unlock(&cmd
->istate_lock
);
966 spin_unlock_bh(&conn
->cmd_lock
);
968 list_for_each_entry_safe(cmd
, cmd_p
, &ack_list
, i_conn_node
) {
969 list_del_init(&cmd
->i_conn_node
);
970 iscsit_free_cmd(cmd
, false);
974 static int iscsit_allocate_iovecs(struct iscsi_cmd
*cmd
)
976 u32 iov_count
= max(1UL, DIV_ROUND_UP(cmd
->se_cmd
.data_length
, PAGE_SIZE
));
978 iov_count
+= ISCSI_IOV_DATA_BUFFER
;
979 cmd
->iov_data
= kcalloc(iov_count
, sizeof(*cmd
->iov_data
), GFP_KERNEL
);
983 cmd
->orig_iov_data_count
= iov_count
;
987 int iscsit_setup_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
990 int data_direction
, payload_length
;
991 struct iscsi_scsi_req
*hdr
;
995 atomic_long_inc(&conn
->sess
->cmd_pdus
);
997 hdr
= (struct iscsi_scsi_req
*) buf
;
998 payload_length
= ntoh24(hdr
->dlength
);
1000 /* FIXME; Add checks for AdditionalHeaderSegment */
1002 if (!(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) &&
1003 !(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005 " not set. Bad iSCSI Initiator.\n");
1006 return iscsit_add_reject_cmd(cmd
,
1007 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1010 if (((hdr
->flags
& ISCSI_FLAG_CMD_READ
) ||
1011 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) && !hdr
->data_length
) {
1013 * From RFC-3720 Section 10.3.1:
1015 * "Either or both of R and W MAY be 1 when either the
1016 * Expected Data Transfer Length and/or Bidirectional Read
1017 * Expected Data Transfer Length are 0"
1019 * For this case, go ahead and clear the unnecssary bits
1020 * to avoid any confusion with ->data_direction.
1022 hdr
->flags
&= ~ISCSI_FLAG_CMD_READ
;
1023 hdr
->flags
&= ~ISCSI_FLAG_CMD_WRITE
;
1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026 " set when Expected Data Transfer Length is 0 for"
1027 " CDB: 0x%02x, Fixing up flags\n", hdr
->cdb
[0]);
1030 if (!(hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1031 !(hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) && (hdr
->data_length
!= 0)) {
1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033 " MUST be set if Expected Data Transfer Length is not 0."
1034 " Bad iSCSI Initiator\n");
1035 return iscsit_add_reject_cmd(cmd
,
1036 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1039 if ((hdr
->flags
& ISCSI_FLAG_CMD_READ
) &&
1040 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) {
1041 pr_err("Bidirectional operations not supported!\n");
1042 return iscsit_add_reject_cmd(cmd
,
1043 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1046 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048 " Scsi Command PDU.\n");
1049 return iscsit_add_reject_cmd(cmd
,
1050 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1053 if (payload_length
&& !conn
->sess
->sess_ops
->ImmediateData
) {
1054 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055 " protocol error.\n", payload_length
);
1056 return iscsit_add_reject_cmd(cmd
,
1057 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1060 if ((be32_to_cpu(hdr
->data_length
) == payload_length
) &&
1061 (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
))) {
1062 pr_err("Expected Data Transfer Length and Length of"
1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064 " bit is not set protocol error\n");
1065 return iscsit_add_reject_cmd(cmd
,
1066 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1069 if (payload_length
> be32_to_cpu(hdr
->data_length
)) {
1070 pr_err("DataSegmentLength: %u is greater than"
1071 " EDTL: %u, protocol error.\n", payload_length
,
1073 return iscsit_add_reject_cmd(cmd
,
1074 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1077 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1078 pr_err("DataSegmentLength: %u is greater than"
1079 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
1081 return iscsit_add_reject_cmd(cmd
,
1082 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1085 if (payload_length
> conn
->sess
->sess_ops
->FirstBurstLength
) {
1086 pr_err("DataSegmentLength: %u is greater than"
1087 " FirstBurstLength: %u, protocol error.\n",
1088 payload_length
, conn
->sess
->sess_ops
->FirstBurstLength
);
1089 return iscsit_add_reject_cmd(cmd
,
1090 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1093 data_direction
= (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
) ? DMA_TO_DEVICE
:
1094 (hdr
->flags
& ISCSI_FLAG_CMD_READ
) ? DMA_FROM_DEVICE
:
1097 cmd
->data_direction
= data_direction
;
1098 iscsi_task_attr
= hdr
->flags
& ISCSI_FLAG_CMD_ATTR_MASK
;
1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102 if ((iscsi_task_attr
== ISCSI_ATTR_UNTAGGED
) ||
1103 (iscsi_task_attr
== ISCSI_ATTR_SIMPLE
))
1104 sam_task_attr
= TCM_SIMPLE_TAG
;
1105 else if (iscsi_task_attr
== ISCSI_ATTR_ORDERED
)
1106 sam_task_attr
= TCM_ORDERED_TAG
;
1107 else if (iscsi_task_attr
== ISCSI_ATTR_HEAD_OF_QUEUE
)
1108 sam_task_attr
= TCM_HEAD_TAG
;
1109 else if (iscsi_task_attr
== ISCSI_ATTR_ACA
)
1110 sam_task_attr
= TCM_ACA_TAG
;
1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr
);
1114 sam_task_attr
= TCM_SIMPLE_TAG
;
1117 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_CMD
;
1118 cmd
->i_state
= ISTATE_NEW_CMD
;
1119 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
1120 cmd
->immediate_data
= (payload_length
) ? 1 : 0;
1121 cmd
->unsolicited_data
= ((!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) &&
1122 (hdr
->flags
& ISCSI_FLAG_CMD_WRITE
)) ? 1 : 0);
1123 if (cmd
->unsolicited_data
)
1124 cmd
->cmd_flags
|= ICF_NON_IMMEDIATE_UNSOLICITED_DATA
;
1126 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1127 if (hdr
->flags
& ISCSI_FLAG_CMD_READ
)
1128 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
1130 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1131 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1132 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1133 cmd
->first_burst_len
= payload_length
;
1135 if (!conn
->sess
->sess_ops
->RDMAExtensions
&&
1136 cmd
->data_direction
== DMA_FROM_DEVICE
) {
1137 struct iscsi_datain_req
*dr
;
1139 dr
= iscsit_allocate_datain_req();
1141 return iscsit_add_reject_cmd(cmd
,
1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1144 iscsit_attach_datain_req(cmd
, dr
);
1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
1151 conn
->sess
->se_sess
, be32_to_cpu(hdr
->data_length
),
1152 cmd
->data_direction
, sam_task_attr
,
1153 cmd
->sense_buffer
+ 2);
1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr
->itt
,
1157 hdr
->cmdsn
, be32_to_cpu(hdr
->data_length
), payload_length
,
1160 target_get_sess_cmd(&cmd
->se_cmd
, true);
1162 cmd
->sense_reason
= transport_lookup_cmd_lun(&cmd
->se_cmd
,
1163 scsilun_to_int(&hdr
->lun
));
1164 if (cmd
->sense_reason
)
1167 /* only used for printks or comparing with ->ref_task_tag */
1168 cmd
->se_cmd
.tag
= (__force u32
)cmd
->init_task_tag
;
1169 cmd
->sense_reason
= target_setup_cmd_from_cdb(&cmd
->se_cmd
, hdr
->cdb
);
1170 if (cmd
->sense_reason
) {
1171 if (cmd
->sense_reason
== TCM_OUT_OF_RESOURCES
) {
1172 return iscsit_add_reject_cmd(cmd
,
1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1179 if (iscsit_build_pdu_and_seq_lists(cmd
, payload_length
) < 0) {
1180 return iscsit_add_reject_cmd(cmd
,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1185 spin_lock_bh(&conn
->cmd_lock
);
1186 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1187 spin_unlock_bh(&conn
->cmd_lock
);
1189 * Check if we need to delay processing because of ALUA
1190 * Active/NonOptimized primary access state..
1192 core_alua_check_nonop_delay(&cmd
->se_cmd
);
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd
);
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd
*cmd
)
1200 iscsit_set_dataout_sequence_values(cmd
);
1202 spin_lock_bh(&cmd
->dataout_timeout_lock
);
1203 iscsit_start_dataout_timer(cmd
, cmd
->conn
);
1204 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout
);
1208 int iscsit_process_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1209 struct iscsi_scsi_req
*hdr
)
1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214 * the Immediate Bit is not set, and no Immediate
1217 * A PDU/CmdSN carrying Immediate Data can only
1218 * be processed after the DataCRC has passed.
1219 * If the DataCRC fails, the CmdSN MUST NOT
1220 * be acknowledged. (See below)
1222 if (!cmd
->immediate_data
) {
1223 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1224 (unsigned char *)hdr
, hdr
->cmdsn
);
1225 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1227 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1228 target_put_sess_cmd(&cmd
->se_cmd
);
1233 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1236 * If no Immediate Data is attached, it's OK to return now.
1238 if (!cmd
->immediate_data
) {
1239 if (!cmd
->sense_reason
&& cmd
->unsolicited_data
)
1240 iscsit_set_unsoliticed_dataout(cmd
);
1241 if (!cmd
->sense_reason
)
1244 target_put_sess_cmd(&cmd
->se_cmd
);
1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250 * execution. These exceptions are processed in CmdSN order using
1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253 if (cmd
->sense_reason
)
1256 * Call directly into transport_generic_new_cmd() to perform
1257 * the backend memory allocation.
1259 cmd
->sense_reason
= transport_generic_new_cmd(&cmd
->se_cmd
);
1260 if (cmd
->sense_reason
)
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd
);
1268 iscsit_get_immediate_data(struct iscsi_cmd
*cmd
, struct iscsi_scsi_req
*hdr
,
1271 int cmdsn_ret
= 0, immed_ret
= IMMEDIATE_DATA_NORMAL_OPERATION
;
1273 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276 goto after_immediate_data
;
1278 * Check for underflow case where both EDTL and immediate data payload
1279 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280 * already been set in target_cmd_size_check() as se_cmd->data_length.
1282 * For this special case, fail the command and dump the immediate data
1285 if (cmd
->first_burst_len
> cmd
->se_cmd
.data_length
) {
1286 cmd
->sense_reason
= TCM_INVALID_CDB_FIELD
;
1287 goto after_immediate_data
;
1290 immed_ret
= iscsit_handle_immediate_data(cmd
, hdr
,
1291 cmd
->first_burst_len
);
1292 after_immediate_data
:
1293 if (immed_ret
== IMMEDIATE_DATA_NORMAL_OPERATION
) {
1295 * A PDU/CmdSN carrying Immediate Data passed
1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297 * Immediate Bit is not set.
1299 cmdsn_ret
= iscsit_sequence_cmd(cmd
->conn
, cmd
,
1300 (unsigned char *)hdr
, hdr
->cmdsn
);
1301 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1304 if (cmd
->sense_reason
|| cmdsn_ret
== CMDSN_LOWER_THAN_EXP
) {
1307 rc
= iscsit_dump_data_payload(cmd
->conn
,
1308 cmd
->first_burst_len
, 1);
1309 target_put_sess_cmd(&cmd
->se_cmd
);
1311 } else if (cmd
->unsolicited_data
)
1312 iscsit_set_unsoliticed_dataout(cmd
);
1314 } else if (immed_ret
== IMMEDIATE_DATA_ERL1_CRC_FAILURE
) {
1316 * Immediate Data failed DataCRC and ERL>=1,
1317 * silently drop this PDU and let the initiator
1318 * plug the CmdSN gap.
1320 * FIXME: Send Unsolicited NOPIN with reserved
1321 * TTT here to help the initiator figure out
1322 * the missing CmdSN, although they should be
1323 * intelligent enough to determine the missing
1324 * CmdSN and issue a retry to plug the sequence.
1326 cmd
->i_state
= ISTATE_REMOVE
;
1327 iscsit_add_cmd_to_immediate_queue(cmd
, cmd
->conn
, cmd
->i_state
);
1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1335 iscsit_handle_scsi_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1338 struct iscsi_scsi_req
*hdr
= (struct iscsi_scsi_req
*)buf
;
1340 bool dump_payload
= false;
1342 rc
= iscsit_setup_scsi_cmd(conn
, cmd
, buf
);
1346 * Allocation iovecs needed for struct socket operations for
1347 * traditional iSCSI block I/O.
1349 if (iscsit_allocate_iovecs(cmd
) < 0) {
1350 return iscsit_reject_cmd(cmd
,
1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
1353 immed_data
= cmd
->immediate_data
;
1355 rc
= iscsit_process_scsi_cmd(conn
, cmd
, hdr
);
1359 dump_payload
= true;
1364 return iscsit_get_immediate_data(cmd
, hdr
, dump_payload
);
1367 static u32
iscsit_do_crypto_hash_sg(
1368 struct ahash_request
*hash
,
1369 struct iscsi_cmd
*cmd
,
1376 struct scatterlist
*sg
;
1377 unsigned int page_off
;
1379 crypto_ahash_init(hash
);
1381 sg
= cmd
->first_data_sg
;
1382 page_off
= cmd
->first_data_sg_off
;
1384 while (data_length
) {
1385 u32 cur_len
= min_t(u32
, data_length
, (sg
->length
- page_off
));
1387 ahash_request_set_crypt(hash
, sg
, NULL
, cur_len
);
1388 crypto_ahash_update(hash
);
1390 data_length
-= cur_len
;
1392 /* iscsit_map_iovec has already checked for invalid sg pointers */
1397 struct scatterlist pad_sg
;
1399 sg_init_one(&pad_sg
, pad_bytes
, padding
);
1400 ahash_request_set_crypt(hash
, &pad_sg
, (u8
*)&data_crc
,
1402 crypto_ahash_finup(hash
);
1404 ahash_request_set_crypt(hash
, NULL
, (u8
*)&data_crc
, 0);
1405 crypto_ahash_final(hash
);
1411 static void iscsit_do_crypto_hash_buf(
1412 struct ahash_request
*hash
,
1419 struct scatterlist sg
[2];
1421 sg_init_table(sg
, ARRAY_SIZE(sg
));
1422 sg_set_buf(sg
, buf
, payload_length
);
1423 sg_set_buf(sg
+ 1, pad_bytes
, padding
);
1425 ahash_request_set_crypt(hash
, sg
, data_crc
, payload_length
+ padding
);
1427 crypto_ahash_digest(hash
);
1431 __iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1432 struct iscsi_cmd
*cmd
, u32 payload_length
,
1435 struct iscsi_data
*hdr
= buf
;
1436 struct se_cmd
*se_cmd
;
1440 atomic_long_add(payload_length
, &conn
->sess
->rx_data_octets
);
1442 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1443 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1444 hdr
->itt
, hdr
->ttt
, hdr
->datasn
, ntohl(hdr
->offset
),
1445 payload_length
, conn
->cid
);
1447 if (cmd
->cmd_flags
& ICF_GOT_LAST_DATAOUT
) {
1448 pr_err("Command ITT: 0x%08x received DataOUT after"
1449 " last DataOUT received, dumping payload\n",
1450 cmd
->init_task_tag
);
1451 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1454 if (cmd
->data_direction
!= DMA_TO_DEVICE
) {
1455 pr_err("Command ITT: 0x%08x received DataOUT for a"
1456 " NON-WRITE command.\n", cmd
->init_task_tag
);
1457 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1459 se_cmd
= &cmd
->se_cmd
;
1460 iscsit_mod_dataout_timer(cmd
);
1462 if ((be32_to_cpu(hdr
->offset
) + payload_length
) > cmd
->se_cmd
.data_length
) {
1463 pr_err("DataOut Offset: %u, Length %u greater than"
1464 " iSCSI Command EDTL %u, protocol error.\n",
1465 hdr
->offset
, payload_length
, cmd
->se_cmd
.data_length
);
1466 return iscsit_reject_cmd(cmd
, ISCSI_REASON_BOOKMARK_INVALID
, buf
);
1469 if (cmd
->unsolicited_data
) {
1470 int dump_unsolicited_data
= 0;
1472 if (conn
->sess
->sess_ops
->InitialR2T
) {
1473 pr_err("Received unexpected unsolicited data"
1474 " while InitialR2T=Yes, protocol error.\n");
1475 transport_send_check_condition_and_sense(&cmd
->se_cmd
,
1476 TCM_UNEXPECTED_UNSOLICITED_DATA
, 0);
1480 * Special case for dealing with Unsolicited DataOUT
1481 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1485 /* Something's amiss if we're not in WRITE_PENDING state... */
1486 WARN_ON(se_cmd
->t_state
!= TRANSPORT_WRITE_PENDING
);
1487 if (!(se_cmd
->se_cmd_flags
& SCF_SUPPORTED_SAM_OPCODE
))
1488 dump_unsolicited_data
= 1;
1490 if (dump_unsolicited_data
) {
1492 * Check if a delayed TASK_ABORTED status needs to
1493 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1494 * received with the unsolicited data out.
1496 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1497 iscsit_stop_dataout_timer(cmd
);
1499 transport_check_aborted_status(se_cmd
,
1500 (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
));
1501 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1505 * For the normal solicited data path:
1507 * Check for a delayed TASK_ABORTED status and dump any
1508 * incoming data out payload if one exists. Also, when the
1509 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1510 * data out sequence, we decrement outstanding_r2ts. Once
1511 * outstanding_r2ts reaches zero, go ahead and send the delayed
1512 * TASK_ABORTED status.
1514 if (se_cmd
->transport_state
& CMD_T_ABORTED
) {
1515 if (hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)
1516 if (--cmd
->outstanding_r2ts
< 1) {
1517 iscsit_stop_dataout_timer(cmd
);
1518 transport_check_aborted_status(
1522 return iscsit_dump_data_payload(conn
, payload_length
, 1);
1526 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1527 * within-command recovery checks before receiving the payload.
1529 rc
= iscsit_check_pre_dataout(cmd
, buf
);
1530 if (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
)
1532 else if (rc
== DATAOUT_CANNOT_RECOVER
)
1537 EXPORT_SYMBOL(__iscsit_check_dataout_hdr
);
1540 iscsit_check_dataout_hdr(struct iscsi_conn
*conn
, void *buf
,
1541 struct iscsi_cmd
**out_cmd
)
1543 struct iscsi_data
*hdr
= buf
;
1544 struct iscsi_cmd
*cmd
;
1545 u32 payload_length
= ntoh24(hdr
->dlength
);
1547 bool success
= false;
1549 if (!payload_length
) {
1550 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1554 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1555 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1556 " MaxXmitDataSegmentLength: %u\n", payload_length
,
1557 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1558 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1561 cmd
= iscsit_find_cmd_from_itt_or_dump(conn
, hdr
->itt
, payload_length
);
1565 rc
= __iscsit_check_dataout_hdr(conn
, buf
, cmd
, payload_length
, &success
);
1572 EXPORT_SYMBOL(iscsit_check_dataout_hdr
);
1575 iscsit_get_dataout(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1576 struct iscsi_data
*hdr
)
1579 u32 checksum
, iov_count
= 0, padding
= 0, rx_got
= 0, rx_size
= 0;
1580 u32 payload_length
= ntoh24(hdr
->dlength
);
1581 int iov_ret
, data_crc_failed
= 0;
1583 rx_size
+= payload_length
;
1584 iov
= &cmd
->iov_data
[0];
1586 iov_ret
= iscsit_map_iovec(cmd
, iov
, be32_to_cpu(hdr
->offset
),
1591 iov_count
+= iov_ret
;
1593 padding
= ((-payload_length
) & 3);
1595 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
1596 iov
[iov_count
++].iov_len
= padding
;
1598 pr_debug("Receiving %u padding bytes.\n", padding
);
1601 if (conn
->conn_ops
->DataDigest
) {
1602 iov
[iov_count
].iov_base
= &checksum
;
1603 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
1604 rx_size
+= ISCSI_CRC_LEN
;
1607 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
1609 iscsit_unmap_iovec(cmd
);
1611 if (rx_got
!= rx_size
)
1614 if (conn
->conn_ops
->DataDigest
) {
1617 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
1618 be32_to_cpu(hdr
->offset
),
1619 payload_length
, padding
,
1622 if (checksum
!= data_crc
) {
1623 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1624 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1625 " does not match computed 0x%08x\n",
1626 hdr
->itt
, hdr
->offset
, payload_length
,
1627 hdr
->datasn
, checksum
, data_crc
);
1628 data_crc_failed
= 1;
1630 pr_debug("Got CRC32C DataDigest 0x%08x for"
1631 " %u bytes of Data Out\n", checksum
,
1636 return data_crc_failed
;
1640 iscsit_check_dataout_payload(struct iscsi_cmd
*cmd
, struct iscsi_data
*hdr
,
1641 bool data_crc_failed
)
1643 struct iscsi_conn
*conn
= cmd
->conn
;
1646 * Increment post receive data and CRC values or perform
1647 * within-command recovery.
1649 rc
= iscsit_check_post_dataout(cmd
, (unsigned char *)hdr
, data_crc_failed
);
1650 if ((rc
== DATAOUT_NORMAL
) || (rc
== DATAOUT_WITHIN_COMMAND_RECOVERY
))
1652 else if (rc
== DATAOUT_SEND_R2T
) {
1653 iscsit_set_dataout_sequence_values(cmd
);
1654 conn
->conn_transport
->iscsit_get_dataout(conn
, cmd
, false);
1655 } else if (rc
== DATAOUT_SEND_TO_TRANSPORT
) {
1657 * Handle extra special case for out of order
1658 * Unsolicited Data Out.
1660 spin_lock_bh(&cmd
->istate_lock
);
1661 ooo_cmdsn
= (cmd
->cmd_flags
& ICF_OOO_CMDSN
);
1662 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
1663 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
1664 spin_unlock_bh(&cmd
->istate_lock
);
1666 iscsit_stop_dataout_timer(cmd
);
1669 target_execute_cmd(&cmd
->se_cmd
);
1671 } else /* DATAOUT_CANNOT_RECOVER */
1676 EXPORT_SYMBOL(iscsit_check_dataout_payload
);
1678 static int iscsit_handle_data_out(struct iscsi_conn
*conn
, unsigned char *buf
)
1680 struct iscsi_cmd
*cmd
= NULL
;
1681 struct iscsi_data
*hdr
= (struct iscsi_data
*)buf
;
1683 bool data_crc_failed
= false;
1685 rc
= iscsit_check_dataout_hdr(conn
, buf
, &cmd
);
1691 rc
= iscsit_get_dataout(conn
, cmd
, hdr
);
1695 data_crc_failed
= true;
1697 return iscsit_check_dataout_payload(cmd
, hdr
, data_crc_failed
);
1700 int iscsit_setup_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1701 struct iscsi_nopout
*hdr
)
1703 u32 payload_length
= ntoh24(hdr
->dlength
);
1705 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
)) {
1706 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1708 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1709 (unsigned char *)hdr
);
1711 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1712 (unsigned char *)hdr
);
1715 if (hdr
->itt
== RESERVED_ITT
&& !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1716 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1717 " not set, protocol error.\n");
1719 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1720 (unsigned char *)hdr
);
1722 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1723 (unsigned char *)hdr
);
1726 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
1727 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1728 " greater than MaxXmitDataSegmentLength: %u, protocol"
1729 " error.\n", payload_length
,
1730 conn
->conn_ops
->MaxXmitDataSegmentLength
);
1732 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1733 (unsigned char *)hdr
);
1735 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
1736 (unsigned char *)hdr
);
1739 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1740 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1741 hdr
->itt
== RESERVED_ITT
? "Response" : "Request",
1742 hdr
->itt
, hdr
->ttt
, hdr
->cmdsn
, hdr
->exp_statsn
,
1745 * This is not a response to a Unsolicited NopIN, which means
1746 * it can either be a NOPOUT ping request (with a valid ITT),
1747 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1748 * Either way, make sure we allocate an struct iscsi_cmd, as both
1749 * can contain ping data.
1751 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1752 cmd
->iscsi_opcode
= ISCSI_OP_NOOP_OUT
;
1753 cmd
->i_state
= ISTATE_SEND_NOPIN
;
1754 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ?
1756 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
1757 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
1758 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
1759 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
1760 cmd
->data_direction
= DMA_NONE
;
1765 EXPORT_SYMBOL(iscsit_setup_nop_out
);
1767 int iscsit_process_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1768 struct iscsi_nopout
*hdr
)
1770 struct iscsi_cmd
*cmd_p
= NULL
;
1773 * Initiator is expecting a NopIN ping reply..
1775 if (hdr
->itt
!= RESERVED_ITT
) {
1777 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
1778 (unsigned char *)hdr
);
1780 spin_lock_bh(&conn
->cmd_lock
);
1781 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
1782 spin_unlock_bh(&conn
->cmd_lock
);
1784 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
1786 if (hdr
->opcode
& ISCSI_OP_IMMEDIATE
) {
1787 iscsit_add_cmd_to_response_queue(cmd
, conn
,
1792 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
1793 (unsigned char *)hdr
, hdr
->cmdsn
);
1794 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
1796 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
1802 * This was a response to a unsolicited NOPIN ping.
1804 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
1805 cmd_p
= iscsit_find_cmd_from_ttt(conn
, be32_to_cpu(hdr
->ttt
));
1809 iscsit_stop_nopin_response_timer(conn
);
1811 cmd_p
->i_state
= ISTATE_REMOVE
;
1812 iscsit_add_cmd_to_immediate_queue(cmd_p
, conn
, cmd_p
->i_state
);
1814 iscsit_start_nopin_timer(conn
);
1818 * Otherwise, initiator is not expecting a NOPIN is response.
1819 * Just ignore for now.
1823 iscsit_free_cmd(cmd
, false);
1827 EXPORT_SYMBOL(iscsit_process_nop_out
);
1829 static int iscsit_handle_nop_out(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1832 unsigned char *ping_data
= NULL
;
1833 struct iscsi_nopout
*hdr
= (struct iscsi_nopout
*)buf
;
1834 struct kvec
*iov
= NULL
;
1835 u32 payload_length
= ntoh24(hdr
->dlength
);
1838 ret
= iscsit_setup_nop_out(conn
, cmd
, hdr
);
1842 * Handle NOP-OUT payload for traditional iSCSI sockets
1844 if (payload_length
&& hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
1845 u32 checksum
, data_crc
, padding
= 0;
1846 int niov
= 0, rx_got
, rx_size
= payload_length
;
1848 ping_data
= kzalloc(payload_length
+ 1, GFP_KERNEL
);
1854 iov
= &cmd
->iov_misc
[0];
1855 iov
[niov
].iov_base
= ping_data
;
1856 iov
[niov
++].iov_len
= payload_length
;
1858 padding
= ((-payload_length
) & 3);
1860 pr_debug("Receiving %u additional bytes"
1861 " for padding.\n", padding
);
1862 iov
[niov
].iov_base
= &cmd
->pad_bytes
;
1863 iov
[niov
++].iov_len
= padding
;
1866 if (conn
->conn_ops
->DataDigest
) {
1867 iov
[niov
].iov_base
= &checksum
;
1868 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
1869 rx_size
+= ISCSI_CRC_LEN
;
1872 rx_got
= rx_data(conn
, &cmd
->iov_misc
[0], niov
, rx_size
);
1873 if (rx_got
!= rx_size
) {
1878 if (conn
->conn_ops
->DataDigest
) {
1879 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
1880 ping_data
, payload_length
,
1881 padding
, cmd
->pad_bytes
,
1884 if (checksum
!= data_crc
) {
1885 pr_err("Ping data CRC32C DataDigest"
1886 " 0x%08x does not match computed 0x%08x\n",
1887 checksum
, data_crc
);
1888 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
1889 pr_err("Unable to recover from"
1890 " NOPOUT Ping DataCRC failure while in"
1896 * Silently drop this PDU and let the
1897 * initiator plug the CmdSN gap.
1899 pr_debug("Dropping NOPOUT"
1900 " Command CmdSN: 0x%08x due to"
1901 " DataCRC error.\n", hdr
->cmdsn
);
1906 pr_debug("Got CRC32C DataDigest"
1907 " 0x%08x for %u bytes of ping data.\n",
1908 checksum
, payload_length
);
1912 ping_data
[payload_length
] = '\0';
1914 * Attach ping data to struct iscsi_cmd->buf_ptr.
1916 cmd
->buf_ptr
= ping_data
;
1917 cmd
->buf_ptr_size
= payload_length
;
1919 pr_debug("Got %u bytes of NOPOUT ping"
1920 " data.\n", payload_length
);
1921 pr_debug("Ping Data: \"%s\"\n", ping_data
);
1924 return iscsit_process_nop_out(conn
, cmd
, hdr
);
1927 iscsit_free_cmd(cmd
, false);
1933 static enum tcm_tmreq_table
iscsit_convert_tmf(u8 iscsi_tmf
)
1935 switch (iscsi_tmf
) {
1936 case ISCSI_TM_FUNC_ABORT_TASK
:
1937 return TMR_ABORT_TASK
;
1938 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
1939 return TMR_ABORT_TASK_SET
;
1940 case ISCSI_TM_FUNC_CLEAR_ACA
:
1941 return TMR_CLEAR_ACA
;
1942 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
1943 return TMR_CLEAR_TASK_SET
;
1944 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
1945 return TMR_LUN_RESET
;
1946 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
1947 return TMR_TARGET_WARM_RESET
;
1948 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
1949 return TMR_TARGET_COLD_RESET
;
1956 iscsit_handle_task_mgt_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
1959 struct se_tmr_req
*se_tmr
;
1960 struct iscsi_tmr_req
*tmr_req
;
1961 struct iscsi_tm
*hdr
;
1962 int out_of_order_cmdsn
= 0, ret
;
1963 bool sess_ref
= false;
1964 u8 function
, tcm_function
= TMR_UNKNOWN
;
1966 hdr
= (struct iscsi_tm
*) buf
;
1967 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
1968 function
= hdr
->flags
;
1970 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1971 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1972 " 0x%08x, CID: %hu\n", hdr
->itt
, hdr
->cmdsn
, function
,
1973 hdr
->rtt
, hdr
->refcmdsn
, conn
->cid
);
1975 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1976 ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1977 hdr
->rtt
!= RESERVED_ITT
)) {
1978 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1979 hdr
->rtt
= RESERVED_ITT
;
1982 if ((function
== ISCSI_TM_FUNC_TASK_REASSIGN
) &&
1983 !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
1984 pr_err("Task Management Request TASK_REASSIGN not"
1985 " issued as immediate command, bad iSCSI Initiator"
1986 "implementation\n");
1987 return iscsit_add_reject_cmd(cmd
,
1988 ISCSI_REASON_PROTOCOL_ERROR
, buf
);
1990 if ((function
!= ISCSI_TM_FUNC_ABORT_TASK
) &&
1991 be32_to_cpu(hdr
->refcmdsn
) != ISCSI_RESERVED_TAG
)
1992 hdr
->refcmdsn
= cpu_to_be32(ISCSI_RESERVED_TAG
);
1994 cmd
->data_direction
= DMA_NONE
;
1995 cmd
->tmr_req
= kzalloc(sizeof(*cmd
->tmr_req
), GFP_KERNEL
);
1997 return iscsit_add_reject_cmd(cmd
,
1998 ISCSI_REASON_BOOKMARK_NO_RESOURCES
,
2002 * TASK_REASSIGN for ERL=2 / connection stays inside of
2003 * LIO-Target $FABRIC_MOD
2005 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2006 transport_init_se_cmd(&cmd
->se_cmd
, &iscsi_ops
,
2007 conn
->sess
->se_sess
, 0, DMA_NONE
,
2008 TCM_SIMPLE_TAG
, cmd
->sense_buffer
+ 2);
2010 target_get_sess_cmd(&cmd
->se_cmd
, true);
2012 tcm_function
= iscsit_convert_tmf(function
);
2013 if (tcm_function
== TMR_UNKNOWN
) {
2014 pr_err("Unknown iSCSI TMR Function:"
2015 " 0x%02x\n", function
);
2016 return iscsit_add_reject_cmd(cmd
,
2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2020 ret
= core_tmr_alloc_req(&cmd
->se_cmd
, cmd
->tmr_req
, tcm_function
,
2023 return iscsit_add_reject_cmd(cmd
,
2024 ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
2026 cmd
->tmr_req
->se_tmr_req
= cmd
->se_cmd
.se_tmr_req
;
2028 cmd
->iscsi_opcode
= ISCSI_OP_SCSI_TMFUNC
;
2029 cmd
->i_state
= ISTATE_SEND_TASKMGTRSP
;
2030 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2031 cmd
->init_task_tag
= hdr
->itt
;
2032 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2033 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2034 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2035 se_tmr
= cmd
->se_cmd
.se_tmr_req
;
2036 tmr_req
= cmd
->tmr_req
;
2038 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2040 if (function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) {
2041 ret
= transport_lookup_tmr_lun(&cmd
->se_cmd
,
2042 scsilun_to_int(&hdr
->lun
));
2044 se_tmr
->response
= ISCSI_TMF_RSP_NO_LUN
;
2050 case ISCSI_TM_FUNC_ABORT_TASK
:
2051 se_tmr
->response
= iscsit_tmr_abort_task(cmd
, buf
);
2052 if (se_tmr
->response
)
2055 case ISCSI_TM_FUNC_ABORT_TASK_SET
:
2056 case ISCSI_TM_FUNC_CLEAR_ACA
:
2057 case ISCSI_TM_FUNC_CLEAR_TASK_SET
:
2058 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET
:
2060 case ISCSI_TM_FUNC_TARGET_WARM_RESET
:
2061 if (iscsit_tmr_task_warm_reset(conn
, tmr_req
, buf
) < 0) {
2062 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2066 case ISCSI_TM_FUNC_TARGET_COLD_RESET
:
2067 if (iscsit_tmr_task_cold_reset(conn
, tmr_req
, buf
) < 0) {
2068 se_tmr
->response
= ISCSI_TMF_RSP_AUTH_FAILED
;
2072 case ISCSI_TM_FUNC_TASK_REASSIGN
:
2073 se_tmr
->response
= iscsit_tmr_task_reassign(cmd
, buf
);
2075 * Perform sanity checks on the ExpDataSN only if the
2076 * TASK_REASSIGN was successful.
2078 if (se_tmr
->response
)
2081 if (iscsit_check_task_reassign_expdatasn(tmr_req
, conn
) < 0)
2082 return iscsit_add_reject_cmd(cmd
,
2083 ISCSI_REASON_BOOKMARK_INVALID
, buf
);
2086 pr_err("Unknown TMR function: 0x%02x, protocol"
2087 " error.\n", function
);
2088 se_tmr
->response
= ISCSI_TMF_RSP_NOT_SUPPORTED
;
2092 if ((function
!= ISCSI_TM_FUNC_TASK_REASSIGN
) &&
2093 (se_tmr
->response
== ISCSI_TMF_RSP_COMPLETE
))
2094 se_tmr
->call_transport
= 1;
2096 spin_lock_bh(&conn
->cmd_lock
);
2097 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2098 spin_unlock_bh(&conn
->cmd_lock
);
2100 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2101 int cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2102 if (cmdsn_ret
== CMDSN_HIGHER_THAN_EXP
)
2103 out_of_order_cmdsn
= 1;
2104 else if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2106 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2109 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2111 if (out_of_order_cmdsn
|| !(hdr
->opcode
& ISCSI_OP_IMMEDIATE
))
2114 * Found the referenced task, send to transport for processing.
2116 if (se_tmr
->call_transport
)
2117 return transport_generic_handle_tmr(&cmd
->se_cmd
);
2120 * Could not find the referenced LUN, task, or Task Management
2121 * command not authorized or supported. Change state and
2122 * let the tx_thread send the response.
2124 * For connection recovery, this is also the default action for
2125 * TMR TASK_REASSIGN.
2128 pr_debug("Handle TMR, using sess_ref=true check\n");
2129 target_put_sess_cmd(&cmd
->se_cmd
);
2132 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2135 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd
);
2137 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2139 iscsit_setup_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2140 struct iscsi_text
*hdr
)
2142 u32 payload_length
= ntoh24(hdr
->dlength
);
2144 if (payload_length
> conn
->conn_ops
->MaxXmitDataSegmentLength
) {
2145 pr_err("Unable to accept text parameter length: %u"
2146 "greater than MaxXmitDataSegmentLength %u.\n",
2147 payload_length
, conn
->conn_ops
->MaxXmitDataSegmentLength
);
2148 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2149 (unsigned char *)hdr
);
2152 if (!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
) ||
2153 (hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
)) {
2154 pr_err("Multi sequence text commands currently not supported\n");
2155 return iscsit_reject_cmd(cmd
, ISCSI_REASON_CMD_NOT_SUPPORTED
,
2156 (unsigned char *)hdr
);
2159 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2160 " ExpStatSN: 0x%08x, Length: %u\n", hdr
->itt
, hdr
->cmdsn
,
2161 hdr
->exp_statsn
, payload_length
);
2163 cmd
->iscsi_opcode
= ISCSI_OP_TEXT
;
2164 cmd
->i_state
= ISTATE_SEND_TEXTRSP
;
2165 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2166 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2167 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2168 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2169 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2170 cmd
->data_direction
= DMA_NONE
;
2171 kfree(cmd
->text_in_ptr
);
2172 cmd
->text_in_ptr
= NULL
;
2176 EXPORT_SYMBOL(iscsit_setup_text_cmd
);
2179 iscsit_process_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2180 struct iscsi_text
*hdr
)
2182 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
;
2186 cmd
->targ_xfer_tag
= be32_to_cpu(hdr
->ttt
);
2187 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF) {
2188 pr_err("Unable to locate text_in buffer for sendtargets"
2192 goto empty_sendtargets
;
2194 if (strncmp("SendTargets", text_in
, 11) != 0) {
2195 pr_err("Received Text Data that is not"
2196 " SendTargets, cannot continue.\n");
2199 text_ptr
= strchr(text_in
, '=');
2201 pr_err("No \"=\" separator found in Text Data,"
2202 " cannot continue.\n");
2205 if (!strncmp("=All", text_ptr
, 4)) {
2206 cmd
->cmd_flags
|= ICF_SENDTARGETS_ALL
;
2207 } else if (!strncmp("=iqn.", text_ptr
, 5) ||
2208 !strncmp("=eui.", text_ptr
, 5)) {
2209 cmd
->cmd_flags
|= ICF_SENDTARGETS_SINGLE
;
2211 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr
);
2215 spin_lock_bh(&conn
->cmd_lock
);
2216 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2217 spin_unlock_bh(&conn
->cmd_lock
);
2220 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2222 if (!(hdr
->opcode
& ISCSI_OP_IMMEDIATE
)) {
2223 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
,
2224 (unsigned char *)hdr
, hdr
->cmdsn
);
2225 if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2231 return iscsit_execute_cmd(cmd
, 0);
2234 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
,
2235 (unsigned char *)hdr
);
2237 EXPORT_SYMBOL(iscsit_process_text_cmd
);
2240 iscsit_handle_text_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2243 struct iscsi_text
*hdr
= (struct iscsi_text
*)buf
;
2244 char *text_in
= NULL
;
2245 u32 payload_length
= ntoh24(hdr
->dlength
);
2248 rc
= iscsit_setup_text_cmd(conn
, cmd
, hdr
);
2252 rx_size
= payload_length
;
2253 if (payload_length
) {
2254 u32 checksum
= 0, data_crc
= 0;
2255 u32 padding
= 0, pad_bytes
= 0;
2256 int niov
= 0, rx_got
;
2259 text_in
= kzalloc(payload_length
, GFP_KERNEL
);
2263 cmd
->text_in_ptr
= text_in
;
2265 memset(iov
, 0, 3 * sizeof(struct kvec
));
2266 iov
[niov
].iov_base
= text_in
;
2267 iov
[niov
++].iov_len
= payload_length
;
2269 padding
= ((-payload_length
) & 3);
2271 iov
[niov
].iov_base
= &pad_bytes
;
2272 iov
[niov
++].iov_len
= padding
;
2274 pr_debug("Receiving %u additional bytes"
2275 " for padding.\n", padding
);
2277 if (conn
->conn_ops
->DataDigest
) {
2278 iov
[niov
].iov_base
= &checksum
;
2279 iov
[niov
++].iov_len
= ISCSI_CRC_LEN
;
2280 rx_size
+= ISCSI_CRC_LEN
;
2283 rx_got
= rx_data(conn
, &iov
[0], niov
, rx_size
);
2284 if (rx_got
!= rx_size
)
2287 if (conn
->conn_ops
->DataDigest
) {
2288 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
2289 text_in
, payload_length
,
2290 padding
, (u8
*)&pad_bytes
,
2293 if (checksum
!= data_crc
) {
2294 pr_err("Text data CRC32C DataDigest"
2295 " 0x%08x does not match computed"
2296 " 0x%08x\n", checksum
, data_crc
);
2297 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2298 pr_err("Unable to recover from"
2299 " Text Data digest failure while in"
2304 * Silently drop this PDU and let the
2305 * initiator plug the CmdSN gap.
2307 pr_debug("Dropping Text"
2308 " Command CmdSN: 0x%08x due to"
2309 " DataCRC error.\n", hdr
->cmdsn
);
2314 pr_debug("Got CRC32C DataDigest"
2315 " 0x%08x for %u bytes of text data.\n",
2316 checksum
, payload_length
);
2319 text_in
[payload_length
- 1] = '\0';
2320 pr_debug("Successfully read %d bytes of text"
2321 " data.\n", payload_length
);
2324 return iscsit_process_text_cmd(conn
, cmd
, hdr
);
2327 kfree(cmd
->text_in_ptr
);
2328 cmd
->text_in_ptr
= NULL
;
2329 return iscsit_reject_cmd(cmd
, ISCSI_REASON_PROTOCOL_ERROR
, buf
);
2332 int iscsit_logout_closesession(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2334 struct iscsi_conn
*conn_p
;
2335 struct iscsi_session
*sess
= conn
->sess
;
2337 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2338 " for SID: %u.\n", conn
->cid
, conn
->sess
->sid
);
2340 atomic_set(&sess
->session_logout
, 1);
2341 atomic_set(&conn
->conn_logout_remove
, 1);
2342 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_SESSION
;
2344 iscsit_inc_conn_usage_count(conn
);
2345 iscsit_inc_session_usage_count(sess
);
2347 spin_lock_bh(&sess
->conn_lock
);
2348 list_for_each_entry(conn_p
, &sess
->sess_conn_list
, conn_list
) {
2349 if (conn_p
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
)
2352 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2353 conn_p
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2355 spin_unlock_bh(&sess
->conn_lock
);
2357 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2362 int iscsit_logout_closeconnection(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2364 struct iscsi_conn
*l_conn
;
2365 struct iscsi_session
*sess
= conn
->sess
;
2367 pr_debug("Received logout request CLOSECONNECTION for CID:"
2368 " %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2371 * A Logout Request with a CLOSECONNECTION reason code for a CID
2372 * can arrive on a connection with a differing CID.
2374 if (conn
->cid
== cmd
->logout_cid
) {
2375 spin_lock_bh(&conn
->state_lock
);
2376 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2377 conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
2379 atomic_set(&conn
->conn_logout_remove
, 1);
2380 conn
->conn_logout_reason
= ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
;
2381 iscsit_inc_conn_usage_count(conn
);
2383 spin_unlock_bh(&conn
->state_lock
);
2386 * Handle all different cid CLOSECONNECTION requests in
2387 * iscsit_logout_post_handler_diffcid() as to give enough
2388 * time for any non immediate command's CmdSN to be
2389 * acknowledged on the connection in question.
2391 * Here we simply make sure the CID is still around.
2393 l_conn
= iscsit_get_conn_from_cid(sess
,
2396 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2397 iscsit_add_cmd_to_response_queue(cmd
, conn
,
2402 iscsit_dec_conn_usage_count(l_conn
);
2405 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2410 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2412 struct iscsi_session
*sess
= conn
->sess
;
2414 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2415 " CID: %hu on CID: %hu.\n", cmd
->logout_cid
, conn
->cid
);
2417 if (sess
->sess_ops
->ErrorRecoveryLevel
!= 2) {
2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419 " while ERL!=2.\n");
2420 cmd
->logout_response
= ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
;
2421 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2425 if (conn
->cid
== cmd
->logout_cid
) {
2426 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2427 " with CID: %hu on CID: %hu, implementation error.\n",
2428 cmd
->logout_cid
, conn
->cid
);
2429 cmd
->logout_response
= ISCSI_LOGOUT_CLEANUP_FAILED
;
2430 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2434 iscsit_add_cmd_to_response_queue(cmd
, conn
, cmd
->i_state
);
2440 iscsit_handle_logout_cmd(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
,
2443 int cmdsn_ret
, logout_remove
= 0;
2445 struct iscsi_logout
*hdr
;
2446 struct iscsi_tiqn
*tiqn
= iscsit_snmp_get_tiqn(conn
);
2448 hdr
= (struct iscsi_logout
*) buf
;
2449 reason_code
= (hdr
->flags
& 0x7f);
2452 spin_lock(&tiqn
->logout_stats
.lock
);
2453 if (reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
)
2454 tiqn
->logout_stats
.normal_logouts
++;
2456 tiqn
->logout_stats
.abnormal_logouts
++;
2457 spin_unlock(&tiqn
->logout_stats
.lock
);
2460 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2461 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2462 hdr
->itt
, hdr
->cmdsn
, hdr
->exp_statsn
, reason_code
,
2463 hdr
->cid
, conn
->cid
);
2465 if (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
) {
2466 pr_err("Received logout request on connection that"
2467 " is not in logged in state, ignoring request.\n");
2468 iscsit_free_cmd(cmd
, false);
2472 cmd
->iscsi_opcode
= ISCSI_OP_LOGOUT
;
2473 cmd
->i_state
= ISTATE_SEND_LOGOUTRSP
;
2474 cmd
->immediate_cmd
= ((hdr
->opcode
& ISCSI_OP_IMMEDIATE
) ? 1 : 0);
2475 conn
->sess
->init_task_tag
= cmd
->init_task_tag
= hdr
->itt
;
2476 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2477 cmd
->cmd_sn
= be32_to_cpu(hdr
->cmdsn
);
2478 cmd
->exp_stat_sn
= be32_to_cpu(hdr
->exp_statsn
);
2479 cmd
->logout_cid
= be16_to_cpu(hdr
->cid
);
2480 cmd
->logout_reason
= reason_code
;
2481 cmd
->data_direction
= DMA_NONE
;
2484 * We need to sleep in these cases (by returning 1) until the Logout
2485 * Response gets sent in the tx thread.
2487 if ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) ||
2488 ((reason_code
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
) &&
2489 be16_to_cpu(hdr
->cid
) == conn
->cid
))
2492 spin_lock_bh(&conn
->cmd_lock
);
2493 list_add_tail(&cmd
->i_conn_node
, &conn
->conn_cmd_list
);
2494 spin_unlock_bh(&conn
->cmd_lock
);
2496 if (reason_code
!= ISCSI_LOGOUT_REASON_RECOVERY
)
2497 iscsit_ack_from_expstatsn(conn
, be32_to_cpu(hdr
->exp_statsn
));
2500 * Immediate commands are executed, well, immediately.
2501 * Non-Immediate Logout Commands are executed in CmdSN order.
2503 if (cmd
->immediate_cmd
) {
2504 int ret
= iscsit_execute_cmd(cmd
, 0);
2509 cmdsn_ret
= iscsit_sequence_cmd(conn
, cmd
, buf
, hdr
->cmdsn
);
2510 if (cmdsn_ret
== CMDSN_LOWER_THAN_EXP
)
2512 else if (cmdsn_ret
== CMDSN_ERROR_CANNOT_RECOVER
)
2516 return logout_remove
;
2518 EXPORT_SYMBOL(iscsit_handle_logout_cmd
);
2520 int iscsit_handle_snack(
2521 struct iscsi_conn
*conn
,
2524 struct iscsi_snack
*hdr
;
2526 hdr
= (struct iscsi_snack
*) buf
;
2527 hdr
->flags
&= ~ISCSI_FLAG_CMD_FINAL
;
2529 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2530 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2531 " CID: %hu\n", hdr
->itt
, hdr
->exp_statsn
, hdr
->flags
,
2532 hdr
->begrun
, hdr
->runlength
, conn
->cid
);
2534 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2535 pr_err("Initiator sent SNACK request while in"
2536 " ErrorRecoveryLevel=0.\n");
2537 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2541 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2542 * call from inside iscsi_send_recovery_datain_or_r2t().
2544 switch (hdr
->flags
& ISCSI_FLAG_SNACK_TYPE_MASK
) {
2546 return iscsit_handle_recovery_datain_or_r2t(conn
, buf
,
2548 be32_to_cpu(hdr
->ttt
),
2549 be32_to_cpu(hdr
->begrun
),
2550 be32_to_cpu(hdr
->runlength
));
2551 case ISCSI_FLAG_SNACK_TYPE_STATUS
:
2552 return iscsit_handle_status_snack(conn
, hdr
->itt
,
2553 be32_to_cpu(hdr
->ttt
),
2554 be32_to_cpu(hdr
->begrun
), be32_to_cpu(hdr
->runlength
));
2555 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK
:
2556 return iscsit_handle_data_ack(conn
, be32_to_cpu(hdr
->ttt
),
2557 be32_to_cpu(hdr
->begrun
),
2558 be32_to_cpu(hdr
->runlength
));
2559 case ISCSI_FLAG_SNACK_TYPE_RDATA
:
2560 /* FIXME: Support R-Data SNACK */
2561 pr_err("R-Data SNACK Not Supported.\n");
2562 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2565 pr_err("Unknown SNACK type 0x%02x, protocol"
2566 " error.\n", hdr
->flags
& 0x0f);
2567 return iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
2573 EXPORT_SYMBOL(iscsit_handle_snack
);
2575 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2577 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2578 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2579 wait_for_completion_interruptible_timeout(
2580 &conn
->rx_half_close_comp
,
2581 ISCSI_RX_THREAD_TCP_TIMEOUT
* HZ
);
2585 static int iscsit_handle_immediate_data(
2586 struct iscsi_cmd
*cmd
,
2587 struct iscsi_scsi_req
*hdr
,
2590 int iov_ret
, rx_got
= 0, rx_size
= 0;
2591 u32 checksum
, iov_count
= 0, padding
= 0;
2592 struct iscsi_conn
*conn
= cmd
->conn
;
2595 iov_ret
= iscsit_map_iovec(cmd
, cmd
->iov_data
, cmd
->write_data_done
, length
);
2597 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2600 iov_count
= iov_ret
;
2601 iov
= &cmd
->iov_data
[0];
2603 padding
= ((-length
) & 3);
2605 iov
[iov_count
].iov_base
= cmd
->pad_bytes
;
2606 iov
[iov_count
++].iov_len
= padding
;
2610 if (conn
->conn_ops
->DataDigest
) {
2611 iov
[iov_count
].iov_base
= &checksum
;
2612 iov
[iov_count
++].iov_len
= ISCSI_CRC_LEN
;
2613 rx_size
+= ISCSI_CRC_LEN
;
2616 rx_got
= rx_data(conn
, &cmd
->iov_data
[0], iov_count
, rx_size
);
2618 iscsit_unmap_iovec(cmd
);
2620 if (rx_got
!= rx_size
) {
2621 iscsit_rx_thread_wait_for_tcp(conn
);
2622 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2625 if (conn
->conn_ops
->DataDigest
) {
2628 data_crc
= iscsit_do_crypto_hash_sg(conn
->conn_rx_hash
, cmd
,
2629 cmd
->write_data_done
, length
, padding
,
2632 if (checksum
!= data_crc
) {
2633 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2634 " does not match computed 0x%08x\n", checksum
,
2637 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
2638 pr_err("Unable to recover from"
2639 " Immediate Data digest failure while"
2641 iscsit_reject_cmd(cmd
,
2642 ISCSI_REASON_DATA_DIGEST_ERROR
,
2643 (unsigned char *)hdr
);
2644 return IMMEDIATE_DATA_CANNOT_RECOVER
;
2646 iscsit_reject_cmd(cmd
,
2647 ISCSI_REASON_DATA_DIGEST_ERROR
,
2648 (unsigned char *)hdr
);
2649 return IMMEDIATE_DATA_ERL1_CRC_FAILURE
;
2652 pr_debug("Got CRC32C DataDigest 0x%08x for"
2653 " %u bytes of Immediate Data\n", checksum
,
2658 cmd
->write_data_done
+= length
;
2660 if (cmd
->write_data_done
== cmd
->se_cmd
.data_length
) {
2661 spin_lock_bh(&cmd
->istate_lock
);
2662 cmd
->cmd_flags
|= ICF_GOT_LAST_DATAOUT
;
2663 cmd
->i_state
= ISTATE_RECEIVED_LAST_DATAOUT
;
2664 spin_unlock_bh(&cmd
->istate_lock
);
2667 return IMMEDIATE_DATA_NORMAL_OPERATION
;
2671 * Called with sess->conn_lock held.
2673 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2674 with active network interface */
2675 static void iscsit_build_conn_drop_async_message(struct iscsi_conn
*conn
)
2677 struct iscsi_cmd
*cmd
;
2678 struct iscsi_conn
*conn_p
;
2682 * Only send a Asynchronous Message on connections whos network
2683 * interface is still functional.
2685 list_for_each_entry(conn_p
, &conn
->sess
->sess_conn_list
, conn_list
) {
2686 if (conn_p
->conn_state
== TARG_CONN_STATE_LOGGED_IN
) {
2687 iscsit_inc_conn_usage_count(conn_p
);
2696 cmd
= iscsit_allocate_cmd(conn_p
, TASK_RUNNING
);
2698 iscsit_dec_conn_usage_count(conn_p
);
2702 cmd
->logout_cid
= conn
->cid
;
2703 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2704 cmd
->i_state
= ISTATE_SEND_ASYNCMSG
;
2706 spin_lock_bh(&conn_p
->cmd_lock
);
2707 list_add_tail(&cmd
->i_conn_node
, &conn_p
->conn_cmd_list
);
2708 spin_unlock_bh(&conn_p
->cmd_lock
);
2710 iscsit_add_cmd_to_response_queue(cmd
, conn_p
, cmd
->i_state
);
2711 iscsit_dec_conn_usage_count(conn_p
);
2714 static int iscsit_send_conn_drop_async_message(
2715 struct iscsi_cmd
*cmd
,
2716 struct iscsi_conn
*conn
)
2718 struct iscsi_async
*hdr
;
2720 cmd
->iscsi_opcode
= ISCSI_OP_ASYNC_EVENT
;
2722 hdr
= (struct iscsi_async
*) cmd
->pdu
;
2723 hdr
->opcode
= ISCSI_OP_ASYNC_EVENT
;
2724 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
2725 cmd
->init_task_tag
= RESERVED_ITT
;
2726 cmd
->targ_xfer_tag
= 0xFFFFFFFF;
2727 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->rsvd4
[0]);
2728 cmd
->stat_sn
= conn
->stat_sn
++;
2729 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2730 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2731 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2732 hdr
->async_event
= ISCSI_ASYNC_MSG_DROPPING_CONNECTION
;
2733 hdr
->param1
= cpu_to_be16(cmd
->logout_cid
);
2734 hdr
->param2
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Wait
);
2735 hdr
->param3
= cpu_to_be16(conn
->sess
->sess_ops
->DefaultTime2Retain
);
2737 pr_debug("Sending Connection Dropped Async Message StatSN:"
2738 " 0x%08x, for CID: %hu on CID: %hu\n", cmd
->stat_sn
,
2739 cmd
->logout_cid
, conn
->cid
);
2741 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2744 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn
*conn
)
2746 if ((conn
->sock
->sk
->sk_shutdown
& SEND_SHUTDOWN
) ||
2747 (conn
->sock
->sk
->sk_shutdown
& RCV_SHUTDOWN
)) {
2748 wait_for_completion_interruptible_timeout(
2749 &conn
->tx_half_close_comp
,
2750 ISCSI_TX_THREAD_TCP_TIMEOUT
* HZ
);
2755 iscsit_build_datain_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2756 struct iscsi_datain
*datain
, struct iscsi_data_rsp
*hdr
,
2759 hdr
->opcode
= ISCSI_OP_SCSI_DATA_IN
;
2760 hdr
->flags
= datain
->flags
;
2761 if (hdr
->flags
& ISCSI_FLAG_DATA_STATUS
) {
2762 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
2763 hdr
->flags
|= ISCSI_FLAG_DATA_OVERFLOW
;
2764 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2765 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
2766 hdr
->flags
|= ISCSI_FLAG_DATA_UNDERFLOW
;
2767 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
2770 hton24(hdr
->dlength
, datain
->length
);
2771 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2772 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
2773 (struct scsi_lun
*)&hdr
->lun
);
2775 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2777 hdr
->itt
= cmd
->init_task_tag
;
2779 if (hdr
->flags
& ISCSI_FLAG_DATA_ACK
)
2780 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2782 hdr
->ttt
= cpu_to_be32(0xFFFFFFFF);
2784 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2786 hdr
->statsn
= cpu_to_be32(0xFFFFFFFF);
2788 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2789 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2790 hdr
->datasn
= cpu_to_be32(datain
->data_sn
);
2791 hdr
->offset
= cpu_to_be32(datain
->offset
);
2793 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2794 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2795 cmd
->init_task_tag
, ntohl(hdr
->statsn
), ntohl(hdr
->datasn
),
2796 ntohl(hdr
->offset
), datain
->length
, conn
->cid
);
2798 EXPORT_SYMBOL(iscsit_build_datain_pdu
);
2800 static int iscsit_send_datain(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2802 struct iscsi_data_rsp
*hdr
= (struct iscsi_data_rsp
*)&cmd
->pdu
[0];
2803 struct iscsi_datain datain
;
2804 struct iscsi_datain_req
*dr
;
2806 bool set_statsn
= false;
2808 memset(&datain
, 0, sizeof(struct iscsi_datain
));
2809 dr
= iscsit_get_datain_values(cmd
, &datain
);
2811 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2812 cmd
->init_task_tag
);
2816 * Be paranoid and double check the logic for now.
2818 if ((datain
.offset
+ datain
.length
) > cmd
->se_cmd
.data_length
) {
2819 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2820 " datain.length: %u exceeds cmd->data_length: %u\n",
2821 cmd
->init_task_tag
, datain
.offset
, datain
.length
,
2822 cmd
->se_cmd
.data_length
);
2826 atomic_long_add(datain
.length
, &conn
->sess
->tx_data_octets
);
2828 * Special case for successfully execution w/ both DATAIN
2831 if ((datain
.flags
& ISCSI_FLAG_DATA_STATUS
) &&
2832 (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
))
2833 datain
.flags
&= ~ISCSI_FLAG_DATA_STATUS
;
2835 if ((dr
->dr_complete
== DATAIN_COMPLETE_NORMAL
) ||
2836 (dr
->dr_complete
== DATAIN_COMPLETE_CONNECTION_RECOVERY
)) {
2837 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2838 cmd
->stat_sn
= conn
->stat_sn
++;
2840 } else if (dr
->dr_complete
==
2841 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY
)
2845 iscsit_build_datain_pdu(cmd
, conn
, &datain
, hdr
, set_statsn
);
2847 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, dr
, &datain
, 0);
2851 if (dr
->dr_complete
) {
2852 eodr
= (cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ?
2854 iscsit_free_datain_req(cmd
, dr
);
2861 iscsit_build_logout_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2862 struct iscsi_logout_rsp
*hdr
)
2864 struct iscsi_conn
*logout_conn
= NULL
;
2865 struct iscsi_conn_recovery
*cr
= NULL
;
2866 struct iscsi_session
*sess
= conn
->sess
;
2868 * The actual shutting down of Sessions and/or Connections
2869 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2870 * is done in scsi_logout_post_handler().
2872 switch (cmd
->logout_reason
) {
2873 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
2874 pr_debug("iSCSI session logout successful, setting"
2875 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2876 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2878 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
2879 if (cmd
->logout_response
== ISCSI_LOGOUT_CID_NOT_FOUND
)
2882 * For CLOSECONNECTION logout requests carrying
2883 * a matching logout CID -> local CID, the reference
2884 * for the local CID will have been incremented in
2885 * iscsi_logout_closeconnection().
2887 * For CLOSECONNECTION logout requests carrying
2888 * a different CID than the connection it arrived
2889 * on, the connection responding to cmd->logout_cid
2890 * is stopped in iscsit_logout_post_handler_diffcid().
2893 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2894 " successful.\n", cmd
->logout_cid
, conn
->cid
);
2895 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2897 case ISCSI_LOGOUT_REASON_RECOVERY
:
2898 if ((cmd
->logout_response
== ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
) ||
2899 (cmd
->logout_response
== ISCSI_LOGOUT_CLEANUP_FAILED
))
2902 * If the connection is still active from our point of view
2903 * force connection recovery to occur.
2905 logout_conn
= iscsit_get_conn_from_cid_rcfr(sess
,
2908 iscsit_connection_reinstatement_rcfr(logout_conn
);
2909 iscsit_dec_conn_usage_count(logout_conn
);
2912 cr
= iscsit_get_inactive_connection_recovery_entry(
2913 conn
->sess
, cmd
->logout_cid
);
2915 pr_err("Unable to locate CID: %hu for"
2916 " REMOVECONNFORRECOVERY Logout Request.\n",
2918 cmd
->logout_response
= ISCSI_LOGOUT_CID_NOT_FOUND
;
2922 iscsit_discard_cr_cmds_by_expstatsn(cr
, cmd
->exp_stat_sn
);
2924 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2925 " for recovery for CID: %hu on CID: %hu successful.\n",
2926 cmd
->logout_cid
, conn
->cid
);
2927 cmd
->logout_response
= ISCSI_LOGOUT_SUCCESS
;
2930 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2931 cmd
->logout_reason
);
2935 hdr
->opcode
= ISCSI_OP_LOGOUT_RSP
;
2936 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2937 hdr
->response
= cmd
->logout_response
;
2938 hdr
->itt
= cmd
->init_task_tag
;
2939 cmd
->stat_sn
= conn
->stat_sn
++;
2940 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2942 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2943 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2944 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2946 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2947 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2948 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
,
2949 cmd
->logout_cid
, conn
->cid
);
2953 EXPORT_SYMBOL(iscsit_build_logout_rsp
);
2956 iscsit_send_logout(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
2960 rc
= iscsit_build_logout_rsp(cmd
, conn
,
2961 (struct iscsi_logout_rsp
*)&cmd
->pdu
[0]);
2965 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
2969 iscsit_build_nopin_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
2970 struct iscsi_nopin
*hdr
, bool nopout_response
)
2972 hdr
->opcode
= ISCSI_OP_NOOP_IN
;
2973 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
2974 hton24(hdr
->dlength
, cmd
->buf_ptr_size
);
2975 if (nopout_response
)
2976 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL
, &hdr
->lun
);
2977 hdr
->itt
= cmd
->init_task_tag
;
2978 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
2979 cmd
->stat_sn
= (nopout_response
) ? conn
->stat_sn
++ :
2981 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
2983 if (nopout_response
)
2984 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
2986 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
2987 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
2989 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2990 " StatSN: 0x%08x, Length %u\n", (nopout_response
) ?
2991 "Solicited" : "Unsolicited", cmd
->init_task_tag
,
2992 cmd
->targ_xfer_tag
, cmd
->stat_sn
, cmd
->buf_ptr_size
);
2994 EXPORT_SYMBOL(iscsit_build_nopin_rsp
);
2997 * Unsolicited NOPIN, either requesting a response or not.
2999 static int iscsit_send_unsolicited_nopin(
3000 struct iscsi_cmd
*cmd
,
3001 struct iscsi_conn
*conn
,
3004 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3007 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, false);
3009 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3010 " 0x%08x CID: %hu\n", hdr
->ttt
, cmd
->stat_sn
, conn
->cid
);
3012 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3016 spin_lock_bh(&cmd
->istate_lock
);
3017 cmd
->i_state
= want_response
?
3018 ISTATE_SENT_NOPIN_WANT_RESPONSE
: ISTATE_SENT_STATUS
;
3019 spin_unlock_bh(&cmd
->istate_lock
);
3025 iscsit_send_nopin(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3027 struct iscsi_nopin
*hdr
= (struct iscsi_nopin
*)&cmd
->pdu
[0];
3029 iscsit_build_nopin_rsp(cmd
, conn
, hdr
, true);
3032 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3033 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3035 pr_debug("Echoing back %u bytes of ping data.\n", cmd
->buf_ptr_size
);
3037 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3042 static int iscsit_send_r2t(
3043 struct iscsi_cmd
*cmd
,
3044 struct iscsi_conn
*conn
)
3046 struct iscsi_r2t
*r2t
;
3047 struct iscsi_r2t_rsp
*hdr
;
3050 r2t
= iscsit_get_r2t_from_list(cmd
);
3054 hdr
= (struct iscsi_r2t_rsp
*) cmd
->pdu
;
3055 memset(hdr
, 0, ISCSI_HDR_LEN
);
3056 hdr
->opcode
= ISCSI_OP_R2T
;
3057 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3058 int_to_scsilun(cmd
->se_cmd
.orig_fe_lun
,
3059 (struct scsi_lun
*)&hdr
->lun
);
3060 hdr
->itt
= cmd
->init_task_tag
;
3061 if (conn
->conn_transport
->iscsit_get_r2t_ttt
)
3062 conn
->conn_transport
->iscsit_get_r2t_ttt(conn
, cmd
, r2t
);
3064 r2t
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3065 hdr
->ttt
= cpu_to_be32(r2t
->targ_xfer_tag
);
3066 hdr
->statsn
= cpu_to_be32(conn
->stat_sn
);
3067 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3068 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3069 hdr
->r2tsn
= cpu_to_be32(r2t
->r2t_sn
);
3070 hdr
->data_offset
= cpu_to_be32(r2t
->offset
);
3071 hdr
->data_length
= cpu_to_be32(r2t
->xfer_len
);
3073 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3074 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3075 (!r2t
->recovery_r2t
) ? "" : "Recovery ", cmd
->init_task_tag
,
3076 r2t
->targ_xfer_tag
, ntohl(hdr
->statsn
), r2t
->r2t_sn
,
3077 r2t
->offset
, r2t
->xfer_len
, conn
->cid
);
3079 spin_lock_bh(&cmd
->r2t_lock
);
3081 spin_unlock_bh(&cmd
->r2t_lock
);
3083 ret
= conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3088 spin_lock_bh(&cmd
->dataout_timeout_lock
);
3089 iscsit_start_dataout_timer(cmd
, conn
);
3090 spin_unlock_bh(&cmd
->dataout_timeout_lock
);
3096 * @recovery: If called from iscsi_task_reassign_complete_write() for
3097 * connection recovery.
3099 int iscsit_build_r2ts_for_cmd(
3100 struct iscsi_conn
*conn
,
3101 struct iscsi_cmd
*cmd
,
3105 u32 offset
= 0, xfer_len
= 0;
3107 spin_lock_bh(&cmd
->r2t_lock
);
3108 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
) {
3109 spin_unlock_bh(&cmd
->r2t_lock
);
3113 if (conn
->sess
->sess_ops
->DataSequenceInOrder
&&
3115 cmd
->r2t_offset
= max(cmd
->r2t_offset
, cmd
->write_data_done
);
3117 while (cmd
->outstanding_r2ts
< conn
->sess
->sess_ops
->MaxOutstandingR2T
) {
3118 if (conn
->sess
->sess_ops
->DataSequenceInOrder
) {
3119 offset
= cmd
->r2t_offset
;
3121 if (first_r2t
&& recovery
) {
3122 int new_data_end
= offset
+
3123 conn
->sess
->sess_ops
->MaxBurstLength
-
3124 cmd
->next_burst_len
;
3126 if (new_data_end
> cmd
->se_cmd
.data_length
)
3127 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3130 conn
->sess
->sess_ops
->MaxBurstLength
-
3131 cmd
->next_burst_len
;
3133 int new_data_end
= offset
+
3134 conn
->sess
->sess_ops
->MaxBurstLength
;
3136 if (new_data_end
> cmd
->se_cmd
.data_length
)
3137 xfer_len
= cmd
->se_cmd
.data_length
- offset
;
3139 xfer_len
= conn
->sess
->sess_ops
->MaxBurstLength
;
3141 cmd
->r2t_offset
+= xfer_len
;
3143 if (cmd
->r2t_offset
== cmd
->se_cmd
.data_length
)
3144 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3146 struct iscsi_seq
*seq
;
3148 seq
= iscsit_get_seq_holder_for_r2t(cmd
);
3150 spin_unlock_bh(&cmd
->r2t_lock
);
3154 offset
= seq
->offset
;
3155 xfer_len
= seq
->xfer_len
;
3157 if (cmd
->seq_send_order
== cmd
->seq_count
)
3158 cmd
->cmd_flags
|= ICF_SENT_LAST_R2T
;
3160 cmd
->outstanding_r2ts
++;
3163 if (iscsit_add_r2t_to_list(cmd
, offset
, xfer_len
, 0, 0) < 0) {
3164 spin_unlock_bh(&cmd
->r2t_lock
);
3168 if (cmd
->cmd_flags
& ICF_SENT_LAST_R2T
)
3171 spin_unlock_bh(&cmd
->r2t_lock
);
3175 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd
);
3177 void iscsit_build_rsp_pdu(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3178 bool inc_stat_sn
, struct iscsi_scsi_rsp
*hdr
)
3181 cmd
->stat_sn
= conn
->stat_sn
++;
3183 atomic_long_inc(&conn
->sess
->rsp_pdus
);
3185 memset(hdr
, 0, ISCSI_HDR_LEN
);
3186 hdr
->opcode
= ISCSI_OP_SCSI_CMD_RSP
;
3187 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3188 if (cmd
->se_cmd
.se_cmd_flags
& SCF_OVERFLOW_BIT
) {
3189 hdr
->flags
|= ISCSI_FLAG_CMD_OVERFLOW
;
3190 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3191 } else if (cmd
->se_cmd
.se_cmd_flags
& SCF_UNDERFLOW_BIT
) {
3192 hdr
->flags
|= ISCSI_FLAG_CMD_UNDERFLOW
;
3193 hdr
->residual_count
= cpu_to_be32(cmd
->se_cmd
.residual_count
);
3195 hdr
->response
= cmd
->iscsi_response
;
3196 hdr
->cmd_status
= cmd
->se_cmd
.scsi_status
;
3197 hdr
->itt
= cmd
->init_task_tag
;
3198 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3200 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3201 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3202 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3204 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3205 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3206 cmd
->init_task_tag
, cmd
->stat_sn
, cmd
->se_cmd
.scsi_status
,
3207 cmd
->se_cmd
.scsi_status
, conn
->cid
);
3209 EXPORT_SYMBOL(iscsit_build_rsp_pdu
);
3211 static int iscsit_send_response(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3213 struct iscsi_scsi_rsp
*hdr
= (struct iscsi_scsi_rsp
*)&cmd
->pdu
[0];
3214 bool inc_stat_sn
= (cmd
->i_state
== ISTATE_SEND_STATUS
);
3215 void *data_buf
= NULL
;
3216 u32 padding
= 0, data_buf_len
= 0;
3218 iscsit_build_rsp_pdu(cmd
, conn
, inc_stat_sn
, hdr
);
3221 * Attach SENSE DATA payload to iSCSI Response PDU
3223 if (cmd
->se_cmd
.sense_buffer
&&
3224 ((cmd
->se_cmd
.se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
3225 (cmd
->se_cmd
.se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
3226 put_unaligned_be16(cmd
->se_cmd
.scsi_sense_length
, cmd
->sense_buffer
);
3227 cmd
->se_cmd
.scsi_sense_length
+= sizeof (__be16
);
3229 padding
= -(cmd
->se_cmd
.scsi_sense_length
) & 3;
3230 hton24(hdr
->dlength
, (u32
)cmd
->se_cmd
.scsi_sense_length
);
3231 data_buf
= cmd
->sense_buffer
;
3232 data_buf_len
= cmd
->se_cmd
.scsi_sense_length
+ padding
;
3235 memset(cmd
->sense_buffer
+
3236 cmd
->se_cmd
.scsi_sense_length
, 0, padding
);
3237 pr_debug("Adding %u bytes of padding to"
3238 " SENSE.\n", padding
);
3241 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3243 cmd
->se_cmd
.scsi_sense_length
);
3246 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, data_buf
,
3250 static u8
iscsit_convert_tcm_tmr_rsp(struct se_tmr_req
*se_tmr
)
3252 switch (se_tmr
->response
) {
3253 case TMR_FUNCTION_COMPLETE
:
3254 return ISCSI_TMF_RSP_COMPLETE
;
3255 case TMR_TASK_DOES_NOT_EXIST
:
3256 return ISCSI_TMF_RSP_NO_TASK
;
3257 case TMR_LUN_DOES_NOT_EXIST
:
3258 return ISCSI_TMF_RSP_NO_LUN
;
3259 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED
:
3260 return ISCSI_TMF_RSP_NOT_SUPPORTED
;
3261 case TMR_FUNCTION_REJECTED
:
3263 return ISCSI_TMF_RSP_REJECTED
;
3268 iscsit_build_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3269 struct iscsi_tm_rsp
*hdr
)
3271 struct se_tmr_req
*se_tmr
= cmd
->se_cmd
.se_tmr_req
;
3273 hdr
->opcode
= ISCSI_OP_SCSI_TMFUNC_RSP
;
3274 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3275 hdr
->response
= iscsit_convert_tcm_tmr_rsp(se_tmr
);
3276 hdr
->itt
= cmd
->init_task_tag
;
3277 cmd
->stat_sn
= conn
->stat_sn
++;
3278 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3280 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3281 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3282 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3284 pr_debug("Built Task Management Response ITT: 0x%08x,"
3285 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3286 cmd
->init_task_tag
, cmd
->stat_sn
, hdr
->response
, conn
->cid
);
3288 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp
);
3291 iscsit_send_task_mgt_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
)
3293 struct iscsi_tm_rsp
*hdr
= (struct iscsi_tm_rsp
*)&cmd
->pdu
[0];
3295 iscsit_build_task_mgt_rsp(cmd
, conn
, hdr
);
3297 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
, NULL
, 0);
3300 static bool iscsit_check_inaddr_any(struct iscsi_np
*np
)
3304 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
3305 const struct sockaddr_in6 sin6
= {
3306 .sin6_addr
= IN6ADDR_ANY_INIT
};
3307 struct sockaddr_in6
*sock_in6
=
3308 (struct sockaddr_in6
*)&np
->np_sockaddr
;
3310 if (!memcmp(sock_in6
->sin6_addr
.s6_addr
,
3311 sin6
.sin6_addr
.s6_addr
, 16))
3314 struct sockaddr_in
* sock_in
=
3315 (struct sockaddr_in
*)&np
->np_sockaddr
;
3317 if (sock_in
->sin_addr
.s_addr
== htonl(INADDR_ANY
))
3324 #define SENDTARGETS_BUF_LIMIT 32768U
3327 iscsit_build_sendtargets_response(struct iscsi_cmd
*cmd
,
3328 enum iscsit_transport_type network_transport
,
3329 int skip_bytes
, bool *completed
)
3331 char *payload
= NULL
;
3332 struct iscsi_conn
*conn
= cmd
->conn
;
3333 struct iscsi_portal_group
*tpg
;
3334 struct iscsi_tiqn
*tiqn
;
3335 struct iscsi_tpg_np
*tpg_np
;
3336 int buffer_len
, end_of_buf
= 0, len
= 0, payload_len
= 0;
3337 int target_name_printed
;
3338 unsigned char buf
[ISCSI_IQN_LEN
+12]; /* iqn + "TargetName=" + \0 */
3339 unsigned char *text_in
= cmd
->text_in_ptr
, *text_ptr
= NULL
;
3342 buffer_len
= min(conn
->conn_ops
->MaxRecvDataSegmentLength
,
3343 SENDTARGETS_BUF_LIMIT
);
3345 payload
= kzalloc(buffer_len
, GFP_KERNEL
);
3350 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3353 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) {
3354 text_ptr
= strchr(text_in
, '=');
3356 pr_err("Unable to locate '=' string in text_in:"
3362 * Skip over '=' character..
3367 spin_lock(&tiqn_lock
);
3368 list_for_each_entry(tiqn
, &g_tiqn_list
, tiqn_list
) {
3369 if ((cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
) &&
3370 strcmp(tiqn
->tiqn
, text_ptr
)) {
3374 target_name_printed
= 0;
3376 spin_lock(&tiqn
->tiqn_tpg_lock
);
3377 list_for_each_entry(tpg
, &tiqn
->tiqn_tpg_list
, tpg_list
) {
3379 /* If demo_mode_discovery=0 and generate_node_acls=0
3380 * (demo mode dislabed) do not return
3381 * TargetName+TargetAddress unless a NodeACL exists.
3384 if ((tpg
->tpg_attrib
.generate_node_acls
== 0) &&
3385 (tpg
->tpg_attrib
.demo_mode_discovery
== 0) &&
3386 (!target_tpg_has_node_acl(&tpg
->tpg_se_tpg
,
3387 cmd
->conn
->sess
->sess_ops
->InitiatorName
))) {
3391 spin_lock(&tpg
->tpg_state_lock
);
3392 active
= (tpg
->tpg_state
== TPG_STATE_ACTIVE
);
3393 spin_unlock(&tpg
->tpg_state_lock
);
3395 if (!active
&& tpg
->tpg_attrib
.tpg_enabled_sendtargets
)
3398 spin_lock(&tpg
->tpg_np_lock
);
3399 list_for_each_entry(tpg_np
, &tpg
->tpg_gnp_list
,
3401 struct iscsi_np
*np
= tpg_np
->tpg_np
;
3402 bool inaddr_any
= iscsit_check_inaddr_any(np
);
3403 struct sockaddr_storage
*sockaddr
;
3405 if (np
->np_network_transport
!= network_transport
)
3408 if (!target_name_printed
) {
3409 len
= sprintf(buf
, "TargetName=%s",
3413 if ((len
+ payload_len
) > buffer_len
) {
3414 spin_unlock(&tpg
->tpg_np_lock
);
3415 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3420 if (skip_bytes
&& len
<= skip_bytes
) {
3423 memcpy(payload
+ payload_len
, buf
, len
);
3425 target_name_printed
= 1;
3426 if (len
> skip_bytes
)
3432 sockaddr
= &conn
->local_sockaddr
;
3434 sockaddr
= &np
->np_sockaddr
;
3436 len
= sprintf(buf
, "TargetAddress="
3442 if ((len
+ payload_len
) > buffer_len
) {
3443 spin_unlock(&tpg
->tpg_np_lock
);
3444 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3449 if (skip_bytes
&& len
<= skip_bytes
) {
3452 memcpy(payload
+ payload_len
, buf
, len
);
3454 if (len
> skip_bytes
)
3458 spin_unlock(&tpg
->tpg_np_lock
);
3460 spin_unlock(&tiqn
->tiqn_tpg_lock
);
3467 if (cmd
->cmd_flags
& ICF_SENDTARGETS_SINGLE
)
3470 spin_unlock(&tiqn_lock
);
3472 cmd
->buf_ptr
= payload
;
3478 iscsit_build_text_rsp(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3479 struct iscsi_text_rsp
*hdr
,
3480 enum iscsit_transport_type network_transport
)
3482 int text_length
, padding
;
3483 bool completed
= true;
3485 text_length
= iscsit_build_sendtargets_response(cmd
, network_transport
,
3486 cmd
->read_data_done
,
3488 if (text_length
< 0)
3492 hdr
->flags
= ISCSI_FLAG_CMD_FINAL
;
3494 hdr
->flags
= ISCSI_FLAG_TEXT_CONTINUE
;
3495 cmd
->read_data_done
+= text_length
;
3496 if (cmd
->targ_xfer_tag
== 0xFFFFFFFF)
3497 cmd
->targ_xfer_tag
= session_get_next_ttt(conn
->sess
);
3499 hdr
->opcode
= ISCSI_OP_TEXT_RSP
;
3500 padding
= ((-text_length
) & 3);
3501 hton24(hdr
->dlength
, text_length
);
3502 hdr
->itt
= cmd
->init_task_tag
;
3503 hdr
->ttt
= cpu_to_be32(cmd
->targ_xfer_tag
);
3504 cmd
->stat_sn
= conn
->stat_sn
++;
3505 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3507 iscsit_increment_maxcmdsn(cmd
, conn
->sess
);
3509 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3510 * correctly increment MaxCmdSN for each response answering a
3511 * non immediate text request with a valid CmdSN.
3513 cmd
->maxcmdsn_inc
= 0;
3514 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3515 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3517 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3518 " Length: %u, CID: %hu F: %d C: %d\n", cmd
->init_task_tag
,
3519 cmd
->targ_xfer_tag
, cmd
->stat_sn
, text_length
, conn
->cid
,
3520 !!(hdr
->flags
& ISCSI_FLAG_CMD_FINAL
),
3521 !!(hdr
->flags
& ISCSI_FLAG_TEXT_CONTINUE
));
3523 return text_length
+ padding
;
3525 EXPORT_SYMBOL(iscsit_build_text_rsp
);
3527 static int iscsit_send_text_rsp(
3528 struct iscsi_cmd
*cmd
,
3529 struct iscsi_conn
*conn
)
3531 struct iscsi_text_rsp
*hdr
= (struct iscsi_text_rsp
*)cmd
->pdu
;
3534 text_length
= iscsit_build_text_rsp(cmd
, conn
, hdr
,
3535 conn
->conn_transport
->transport_type
);
3536 if (text_length
< 0)
3539 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3545 iscsit_build_reject(struct iscsi_cmd
*cmd
, struct iscsi_conn
*conn
,
3546 struct iscsi_reject
*hdr
)
3548 hdr
->opcode
= ISCSI_OP_REJECT
;
3549 hdr
->reason
= cmd
->reject_reason
;
3550 hdr
->flags
|= ISCSI_FLAG_CMD_FINAL
;
3551 hton24(hdr
->dlength
, ISCSI_HDR_LEN
);
3552 hdr
->ffffffff
= cpu_to_be32(0xffffffff);
3553 cmd
->stat_sn
= conn
->stat_sn
++;
3554 hdr
->statsn
= cpu_to_be32(cmd
->stat_sn
);
3555 hdr
->exp_cmdsn
= cpu_to_be32(conn
->sess
->exp_cmd_sn
);
3556 hdr
->max_cmdsn
= cpu_to_be32((u32
) atomic_read(&conn
->sess
->max_cmd_sn
));
3559 EXPORT_SYMBOL(iscsit_build_reject
);
3561 static int iscsit_send_reject(
3562 struct iscsi_cmd
*cmd
,
3563 struct iscsi_conn
*conn
)
3565 struct iscsi_reject
*hdr
= (struct iscsi_reject
*)&cmd
->pdu
[0];
3567 iscsit_build_reject(cmd
, conn
, hdr
);
3569 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3570 " CID: %hu\n", ntohl(hdr
->statsn
), hdr
->reason
, conn
->cid
);
3572 return conn
->conn_transport
->iscsit_xmit_pdu(conn
, cmd
, NULL
,
3577 void iscsit_thread_get_cpumask(struct iscsi_conn
*conn
)
3581 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3582 * within iscsit_start_kthreads()
3584 * Here we use bitmap_id to determine which CPU that this
3585 * iSCSI connection's RX/TX threads will be scheduled to
3588 ord
= conn
->bitmap_id
% cpumask_weight(cpu_online_mask
);
3589 for_each_online_cpu(cpu
) {
3591 cpumask_set_cpu(cpu
, conn
->conn_cpumask
);
3596 * This should never be reached..
3599 cpumask_setall(conn
->conn_cpumask
);
3603 iscsit_immediate_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3608 case ISTATE_SEND_R2T
:
3609 ret
= iscsit_send_r2t(cmd
, conn
);
3614 spin_lock_bh(&conn
->cmd_lock
);
3615 list_del_init(&cmd
->i_conn_node
);
3616 spin_unlock_bh(&conn
->cmd_lock
);
3618 iscsit_free_cmd(cmd
, false);
3620 case ISTATE_SEND_NOPIN_WANT_RESPONSE
:
3621 iscsit_mod_nopin_response_timer(conn
);
3622 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 1);
3626 case ISTATE_SEND_NOPIN_NO_RESPONSE
:
3627 ret
= iscsit_send_unsolicited_nopin(cmd
, conn
, 0);
3632 pr_err("Unknown Opcode: 0x%02x ITT:"
3633 " 0x%08x, i_state: %d on CID: %hu\n",
3634 cmd
->iscsi_opcode
, cmd
->init_task_tag
, state
,
3644 EXPORT_SYMBOL(iscsit_immediate_queue
);
3647 iscsit_handle_immediate_queue(struct iscsi_conn
*conn
)
3649 struct iscsit_transport
*t
= conn
->conn_transport
;
3650 struct iscsi_queue_req
*qr
;
3651 struct iscsi_cmd
*cmd
;
3655 while ((qr
= iscsit_get_cmd_from_immediate_queue(conn
))) {
3656 atomic_set(&conn
->check_immediate_queue
, 0);
3659 kmem_cache_free(lio_qr_cache
, qr
);
3661 ret
= t
->iscsit_immediate_queue(conn
, cmd
, state
);
3670 iscsit_response_queue(struct iscsi_conn
*conn
, struct iscsi_cmd
*cmd
, int state
)
3676 case ISTATE_SEND_DATAIN
:
3677 ret
= iscsit_send_datain(cmd
, conn
);
3682 goto check_rsp_state
;
3683 else if (ret
== 1) {
3685 spin_lock_bh(&cmd
->istate_lock
);
3686 cmd
->i_state
= ISTATE_SENT_STATUS
;
3687 spin_unlock_bh(&cmd
->istate_lock
);
3689 if (atomic_read(&conn
->check_immediate_queue
))
3693 } else if (ret
== 2) {
3694 /* Still must send status,
3695 SCF_TRANSPORT_TASK_SENSE was set */
3696 spin_lock_bh(&cmd
->istate_lock
);
3697 cmd
->i_state
= ISTATE_SEND_STATUS
;
3698 spin_unlock_bh(&cmd
->istate_lock
);
3699 state
= ISTATE_SEND_STATUS
;
3700 goto check_rsp_state
;
3704 case ISTATE_SEND_STATUS
:
3705 case ISTATE_SEND_STATUS_RECOVERY
:
3706 ret
= iscsit_send_response(cmd
, conn
);
3708 case ISTATE_SEND_LOGOUTRSP
:
3709 ret
= iscsit_send_logout(cmd
, conn
);
3711 case ISTATE_SEND_ASYNCMSG
:
3712 ret
= iscsit_send_conn_drop_async_message(
3715 case ISTATE_SEND_NOPIN
:
3716 ret
= iscsit_send_nopin(cmd
, conn
);
3718 case ISTATE_SEND_REJECT
:
3719 ret
= iscsit_send_reject(cmd
, conn
);
3721 case ISTATE_SEND_TASKMGTRSP
:
3722 ret
= iscsit_send_task_mgt_rsp(cmd
, conn
);
3725 ret
= iscsit_tmr_post_handler(cmd
, conn
);
3727 iscsit_fall_back_to_erl0(conn
->sess
);
3729 case ISTATE_SEND_TEXTRSP
:
3730 ret
= iscsit_send_text_rsp(cmd
, conn
);
3733 pr_err("Unknown Opcode: 0x%02x ITT:"
3734 " 0x%08x, i_state: %d on CID: %hu\n",
3735 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3743 case ISTATE_SEND_LOGOUTRSP
:
3744 if (!iscsit_logout_post_handler(cmd
, conn
))
3747 case ISTATE_SEND_STATUS
:
3748 case ISTATE_SEND_ASYNCMSG
:
3749 case ISTATE_SEND_NOPIN
:
3750 case ISTATE_SEND_STATUS_RECOVERY
:
3751 case ISTATE_SEND_TEXTRSP
:
3752 case ISTATE_SEND_TASKMGTRSP
:
3753 case ISTATE_SEND_REJECT
:
3754 spin_lock_bh(&cmd
->istate_lock
);
3755 cmd
->i_state
= ISTATE_SENT_STATUS
;
3756 spin_unlock_bh(&cmd
->istate_lock
);
3759 pr_err("Unknown Opcode: 0x%02x ITT:"
3760 " 0x%08x, i_state: %d on CID: %hu\n",
3761 cmd
->iscsi_opcode
, cmd
->init_task_tag
,
3762 cmd
->i_state
, conn
->cid
);
3766 if (atomic_read(&conn
->check_immediate_queue
))
3774 EXPORT_SYMBOL(iscsit_response_queue
);
3776 static int iscsit_handle_response_queue(struct iscsi_conn
*conn
)
3778 struct iscsit_transport
*t
= conn
->conn_transport
;
3779 struct iscsi_queue_req
*qr
;
3780 struct iscsi_cmd
*cmd
;
3784 while ((qr
= iscsit_get_cmd_from_response_queue(conn
))) {
3787 kmem_cache_free(lio_qr_cache
, qr
);
3789 ret
= t
->iscsit_response_queue(conn
, cmd
, state
);
3790 if (ret
== 1 || ret
< 0)
3797 int iscsi_target_tx_thread(void *arg
)
3800 struct iscsi_conn
*conn
= arg
;
3801 bool conn_freed
= false;
3804 * Allow ourselves to be interrupted by SIGINT so that a
3805 * connection recovery / failure event can be triggered externally.
3807 allow_signal(SIGINT
);
3809 while (!kthread_should_stop()) {
3811 * Ensure that both TX and RX per connection kthreads
3812 * are scheduled to run on the same CPU.
3814 iscsit_thread_check_cpumask(conn
, current
, 1);
3816 wait_event_interruptible(conn
->queues_wq
,
3817 !iscsit_conn_all_queues_empty(conn
));
3819 if (signal_pending(current
))
3823 ret
= iscsit_handle_immediate_queue(conn
);
3827 ret
= iscsit_handle_response_queue(conn
);
3830 } else if (ret
== -ECONNRESET
) {
3833 } else if (ret
< 0) {
3840 * Avoid the normal connection failure code-path if this connection
3841 * is still within LOGIN mode, and iscsi_np process context is
3842 * responsible for cleaning up the early connection failure.
3844 if (conn
->conn_state
!= TARG_CONN_STATE_IN_LOGIN
)
3845 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
3848 while (!kthread_should_stop()) {
3855 static int iscsi_target_rx_opcode(struct iscsi_conn
*conn
, unsigned char *buf
)
3857 struct iscsi_hdr
*hdr
= (struct iscsi_hdr
*)buf
;
3858 struct iscsi_cmd
*cmd
;
3861 switch (hdr
->opcode
& ISCSI_OPCODE_MASK
) {
3862 case ISCSI_OP_SCSI_CMD
:
3863 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3867 ret
= iscsit_handle_scsi_cmd(conn
, cmd
, buf
);
3869 case ISCSI_OP_SCSI_DATA_OUT
:
3870 ret
= iscsit_handle_data_out(conn
, buf
);
3872 case ISCSI_OP_NOOP_OUT
:
3874 if (hdr
->ttt
== cpu_to_be32(0xFFFFFFFF)) {
3875 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3879 ret
= iscsit_handle_nop_out(conn
, cmd
, buf
);
3881 case ISCSI_OP_SCSI_TMFUNC
:
3882 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3886 ret
= iscsit_handle_task_mgt_cmd(conn
, cmd
, buf
);
3889 if (hdr
->ttt
!= cpu_to_be32(0xFFFFFFFF)) {
3890 cmd
= iscsit_find_cmd_from_itt(conn
, hdr
->itt
);
3894 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3899 ret
= iscsit_handle_text_cmd(conn
, cmd
, buf
);
3901 case ISCSI_OP_LOGOUT
:
3902 cmd
= iscsit_allocate_cmd(conn
, TASK_INTERRUPTIBLE
);
3906 ret
= iscsit_handle_logout_cmd(conn
, cmd
, buf
);
3908 wait_for_completion_timeout(&conn
->conn_logout_comp
,
3909 SECONDS_FOR_LOGOUT_COMP
* HZ
);
3911 case ISCSI_OP_SNACK
:
3912 ret
= iscsit_handle_snack(conn
, buf
);
3915 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr
->opcode
);
3916 if (!conn
->sess
->sess_ops
->ErrorRecoveryLevel
) {
3917 pr_err("Cannot recover from unknown"
3918 " opcode while ERL=0, closing iSCSI connection.\n");
3921 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3922 " closing iSCSI connection.\n");
3929 return iscsit_add_reject(conn
, ISCSI_REASON_BOOKMARK_NO_RESOURCES
, buf
);
3932 static bool iscsi_target_check_conn_state(struct iscsi_conn
*conn
)
3936 spin_lock_bh(&conn
->state_lock
);
3937 ret
= (conn
->conn_state
!= TARG_CONN_STATE_LOGGED_IN
);
3938 spin_unlock_bh(&conn
->state_lock
);
3943 static void iscsit_get_rx_pdu(struct iscsi_conn
*conn
)
3946 u8 buffer
[ISCSI_HDR_LEN
], opcode
;
3947 u32 checksum
= 0, digest
= 0;
3950 while (!kthread_should_stop()) {
3952 * Ensure that both TX and RX per connection kthreads
3953 * are scheduled to run on the same CPU.
3955 iscsit_thread_check_cpumask(conn
, current
, 0);
3957 memset(buffer
, 0, ISCSI_HDR_LEN
);
3958 memset(&iov
, 0, sizeof(struct kvec
));
3960 iov
.iov_base
= buffer
;
3961 iov
.iov_len
= ISCSI_HDR_LEN
;
3963 ret
= rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
);
3964 if (ret
!= ISCSI_HDR_LEN
) {
3965 iscsit_rx_thread_wait_for_tcp(conn
);
3969 if (conn
->conn_ops
->HeaderDigest
) {
3970 iov
.iov_base
= &digest
;
3971 iov
.iov_len
= ISCSI_CRC_LEN
;
3973 ret
= rx_data(conn
, &iov
, 1, ISCSI_CRC_LEN
);
3974 if (ret
!= ISCSI_CRC_LEN
) {
3975 iscsit_rx_thread_wait_for_tcp(conn
);
3979 iscsit_do_crypto_hash_buf(conn
->conn_rx_hash
,
3980 buffer
, ISCSI_HDR_LEN
,
3981 0, NULL
, (u8
*)&checksum
);
3983 if (digest
!= checksum
) {
3984 pr_err("HeaderDigest CRC32C failed,"
3985 " received 0x%08x, computed 0x%08x\n",
3988 * Set the PDU to 0xff so it will intentionally
3989 * hit default in the switch below.
3991 memset(buffer
, 0xff, ISCSI_HDR_LEN
);
3992 atomic_long_inc(&conn
->sess
->conn_digest_errors
);
3994 pr_debug("Got HeaderDigest CRC32C"
3995 " 0x%08x\n", checksum
);
3999 if (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
)
4002 opcode
= buffer
[0] & ISCSI_OPCODE_MASK
;
4004 if (conn
->sess
->sess_ops
->SessionType
&&
4005 ((!(opcode
& ISCSI_OP_TEXT
)) ||
4006 (!(opcode
& ISCSI_OP_LOGOUT
)))) {
4007 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4008 " while in Discovery Session, rejecting.\n", opcode
);
4009 iscsit_add_reject(conn
, ISCSI_REASON_PROTOCOL_ERROR
,
4014 ret
= iscsi_target_rx_opcode(conn
, buffer
);
4020 int iscsi_target_rx_thread(void *arg
)
4023 struct iscsi_conn
*conn
= arg
;
4024 bool conn_freed
= false;
4027 * Allow ourselves to be interrupted by SIGINT so that a
4028 * connection recovery / failure event can be triggered externally.
4030 allow_signal(SIGINT
);
4032 * Wait for iscsi_post_login_handler() to complete before allowing
4033 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4035 rc
= wait_for_completion_interruptible(&conn
->rx_login_comp
);
4036 if (rc
< 0 || iscsi_target_check_conn_state(conn
))
4039 if (!conn
->conn_transport
->iscsit_get_rx_pdu
)
4042 conn
->conn_transport
->iscsit_get_rx_pdu(conn
);
4044 if (!signal_pending(current
))
4045 atomic_set(&conn
->transport_failed
, 1);
4046 iscsit_take_action_for_connection_exit(conn
, &conn_freed
);
4050 while (!kthread_should_stop()) {
4058 static void iscsit_release_commands_from_conn(struct iscsi_conn
*conn
)
4060 LIST_HEAD(tmp_list
);
4061 struct iscsi_cmd
*cmd
= NULL
, *cmd_tmp
= NULL
;
4062 struct iscsi_session
*sess
= conn
->sess
;
4064 * We expect this function to only ever be called from either RX or TX
4065 * thread context via iscsit_close_connection() once the other context
4066 * has been reset -> returned sleeping pre-handler state.
4068 spin_lock_bh(&conn
->cmd_lock
);
4069 list_splice_init(&conn
->conn_cmd_list
, &tmp_list
);
4071 list_for_each_entry(cmd
, &tmp_list
, i_conn_node
) {
4072 struct se_cmd
*se_cmd
= &cmd
->se_cmd
;
4074 if (se_cmd
->se_tfo
!= NULL
) {
4075 spin_lock(&se_cmd
->t_state_lock
);
4076 se_cmd
->transport_state
|= CMD_T_FABRIC_STOP
;
4077 spin_unlock(&se_cmd
->t_state_lock
);
4080 spin_unlock_bh(&conn
->cmd_lock
);
4082 list_for_each_entry_safe(cmd
, cmd_tmp
, &tmp_list
, i_conn_node
) {
4083 list_del_init(&cmd
->i_conn_node
);
4085 iscsit_increment_maxcmdsn(cmd
, sess
);
4086 iscsit_free_cmd(cmd
, true);
4091 static void iscsit_stop_timers_for_cmds(
4092 struct iscsi_conn
*conn
)
4094 struct iscsi_cmd
*cmd
;
4096 spin_lock_bh(&conn
->cmd_lock
);
4097 list_for_each_entry(cmd
, &conn
->conn_cmd_list
, i_conn_node
) {
4098 if (cmd
->data_direction
== DMA_TO_DEVICE
)
4099 iscsit_stop_dataout_timer(cmd
);
4101 spin_unlock_bh(&conn
->cmd_lock
);
4104 int iscsit_close_connection(
4105 struct iscsi_conn
*conn
)
4107 int conn_logout
= (conn
->conn_state
== TARG_CONN_STATE_IN_LOGOUT
);
4108 struct iscsi_session
*sess
= conn
->sess
;
4110 pr_debug("Closing iSCSI connection CID %hu on SID:"
4111 " %u\n", conn
->cid
, sess
->sid
);
4113 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4114 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4115 * sleeping and the logout response never got sent because the
4116 * connection failed.
4118 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4119 * to signal logout response TX interrupt completion. Go ahead and skip
4120 * this for iser since isert_rx_opcode() does not wait on logout failure,
4121 * and to avoid iscsi_conn pointer dereference in iser-target code.
4123 if (!conn
->conn_transport
->rdma_shutdown
)
4124 complete(&conn
->conn_logout_comp
);
4126 if (!strcmp(current
->comm
, ISCSI_RX_THREAD_NAME
)) {
4127 if (conn
->tx_thread
&&
4128 cmpxchg(&conn
->tx_thread_active
, true, false)) {
4129 send_sig(SIGINT
, conn
->tx_thread
, 1);
4130 kthread_stop(conn
->tx_thread
);
4132 } else if (!strcmp(current
->comm
, ISCSI_TX_THREAD_NAME
)) {
4133 if (conn
->rx_thread
&&
4134 cmpxchg(&conn
->rx_thread_active
, true, false)) {
4135 send_sig(SIGINT
, conn
->rx_thread
, 1);
4136 kthread_stop(conn
->rx_thread
);
4140 spin_lock(&iscsit_global
->ts_bitmap_lock
);
4141 bitmap_release_region(iscsit_global
->ts_bitmap
, conn
->bitmap_id
,
4143 spin_unlock(&iscsit_global
->ts_bitmap_lock
);
4145 iscsit_stop_timers_for_cmds(conn
);
4146 iscsit_stop_nopin_response_timer(conn
);
4147 iscsit_stop_nopin_timer(conn
);
4149 if (conn
->conn_transport
->iscsit_wait_conn
)
4150 conn
->conn_transport
->iscsit_wait_conn(conn
);
4153 * During Connection recovery drop unacknowledged out of order
4154 * commands for this connection, and prepare the other commands
4157 * During normal operation clear the out of order commands (but
4158 * do not free the struct iscsi_ooo_cmdsn's) and release all
4159 * struct iscsi_cmds.
4161 if (atomic_read(&conn
->connection_recovery
)) {
4162 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn
);
4163 iscsit_prepare_cmds_for_reallegiance(conn
);
4165 iscsit_clear_ooo_cmdsns_for_conn(conn
);
4166 iscsit_release_commands_from_conn(conn
);
4168 iscsit_free_queue_reqs_for_conn(conn
);
4171 * Handle decrementing session or connection usage count if
4172 * a logout response was not able to be sent because the
4173 * connection failed. Fall back to Session Recovery here.
4175 if (atomic_read(&conn
->conn_logout_remove
)) {
4176 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_SESSION
) {
4177 iscsit_dec_conn_usage_count(conn
);
4178 iscsit_dec_session_usage_count(sess
);
4180 if (conn
->conn_logout_reason
== ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
)
4181 iscsit_dec_conn_usage_count(conn
);
4183 atomic_set(&conn
->conn_logout_remove
, 0);
4184 atomic_set(&sess
->session_reinstatement
, 0);
4185 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4188 spin_lock_bh(&sess
->conn_lock
);
4189 list_del(&conn
->conn_list
);
4192 * Attempt to let the Initiator know this connection failed by
4193 * sending an Connection Dropped Async Message on another
4194 * active connection.
4196 if (atomic_read(&conn
->connection_recovery
))
4197 iscsit_build_conn_drop_async_message(conn
);
4199 spin_unlock_bh(&sess
->conn_lock
);
4202 * If connection reinstatement is being performed on this connection,
4203 * up the connection reinstatement semaphore that is being blocked on
4204 * in iscsit_cause_connection_reinstatement().
4206 spin_lock_bh(&conn
->state_lock
);
4207 if (atomic_read(&conn
->sleep_on_conn_wait_comp
)) {
4208 spin_unlock_bh(&conn
->state_lock
);
4209 complete(&conn
->conn_wait_comp
);
4210 wait_for_completion(&conn
->conn_post_wait_comp
);
4211 spin_lock_bh(&conn
->state_lock
);
4215 * If connection reinstatement is being performed on this connection
4216 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4217 * connection wait rcfr semaphore that is being blocked on
4218 * an iscsit_connection_reinstatement_rcfr().
4220 if (atomic_read(&conn
->connection_wait_rcfr
)) {
4221 spin_unlock_bh(&conn
->state_lock
);
4222 complete(&conn
->conn_wait_rcfr_comp
);
4223 wait_for_completion(&conn
->conn_post_wait_comp
);
4224 spin_lock_bh(&conn
->state_lock
);
4226 atomic_set(&conn
->connection_reinstatement
, 1);
4227 spin_unlock_bh(&conn
->state_lock
);
4230 * If any other processes are accessing this connection pointer we
4231 * must wait until they have completed.
4233 iscsit_check_conn_usage_count(conn
);
4235 ahash_request_free(conn
->conn_tx_hash
);
4236 if (conn
->conn_rx_hash
) {
4237 struct crypto_ahash
*tfm
;
4239 tfm
= crypto_ahash_reqtfm(conn
->conn_rx_hash
);
4240 ahash_request_free(conn
->conn_rx_hash
);
4241 crypto_free_ahash(tfm
);
4244 free_cpumask_var(conn
->conn_cpumask
);
4246 kfree(conn
->conn_ops
);
4247 conn
->conn_ops
= NULL
;
4250 sock_release(conn
->sock
);
4252 if (conn
->conn_transport
->iscsit_free_conn
)
4253 conn
->conn_transport
->iscsit_free_conn(conn
);
4255 iscsit_put_transport(conn
->conn_transport
);
4257 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4258 conn
->conn_state
= TARG_CONN_STATE_FREE
;
4261 spin_lock_bh(&sess
->conn_lock
);
4262 atomic_dec(&sess
->nconn
);
4263 pr_debug("Decremented iSCSI connection count to %hu from node:"
4264 " %s\n", atomic_read(&sess
->nconn
),
4265 sess
->sess_ops
->InitiatorName
);
4267 * Make sure that if one connection fails in an non ERL=2 iSCSI
4268 * Session that they all fail.
4270 if ((sess
->sess_ops
->ErrorRecoveryLevel
!= 2) && !conn_logout
&&
4271 !atomic_read(&sess
->session_logout
))
4272 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4275 * If this was not the last connection in the session, and we are
4276 * performing session reinstatement or falling back to ERL=0, call
4277 * iscsit_stop_session() without sleeping to shutdown the other
4278 * active connections.
4280 if (atomic_read(&sess
->nconn
)) {
4281 if (!atomic_read(&sess
->session_reinstatement
) &&
4282 !atomic_read(&sess
->session_fall_back_to_erl0
)) {
4283 spin_unlock_bh(&sess
->conn_lock
);
4286 if (!atomic_read(&sess
->session_stop_active
)) {
4287 atomic_set(&sess
->session_stop_active
, 1);
4288 spin_unlock_bh(&sess
->conn_lock
);
4289 iscsit_stop_session(sess
, 0, 0);
4292 spin_unlock_bh(&sess
->conn_lock
);
4297 * If this was the last connection in the session and one of the
4298 * following is occurring:
4300 * Session Reinstatement is not being performed, and are falling back
4301 * to ERL=0 call iscsit_close_session().
4303 * Session Logout was requested. iscsit_close_session() will be called
4306 * Session Continuation is not being performed, start the Time2Retain
4307 * handler and check if sleep_on_sess_wait_sem is active.
4309 if (!atomic_read(&sess
->session_reinstatement
) &&
4310 atomic_read(&sess
->session_fall_back_to_erl0
)) {
4311 spin_unlock_bh(&sess
->conn_lock
);
4312 iscsit_close_session(sess
);
4315 } else if (atomic_read(&sess
->session_logout
)) {
4316 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4317 sess
->session_state
= TARG_SESS_STATE_FREE
;
4318 spin_unlock_bh(&sess
->conn_lock
);
4320 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4321 complete(&sess
->session_wait_comp
);
4325 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4326 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4328 if (!atomic_read(&sess
->session_continuation
)) {
4329 spin_unlock_bh(&sess
->conn_lock
);
4330 iscsit_start_time2retain_handler(sess
);
4332 spin_unlock_bh(&sess
->conn_lock
);
4334 if (atomic_read(&sess
->sleep_on_sess_wait_comp
))
4335 complete(&sess
->session_wait_comp
);
4342 * If the iSCSI Session for the iSCSI Initiator Node exists,
4343 * forcefully shutdown the iSCSI NEXUS.
4345 int iscsit_close_session(struct iscsi_session
*sess
)
4347 struct iscsi_portal_group
*tpg
= sess
->tpg
;
4348 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4350 if (atomic_read(&sess
->nconn
)) {
4351 pr_err("%d connection(s) still exist for iSCSI session"
4352 " to %s\n", atomic_read(&sess
->nconn
),
4353 sess
->sess_ops
->InitiatorName
);
4357 spin_lock_bh(&se_tpg
->session_lock
);
4358 atomic_set(&sess
->session_logout
, 1);
4359 atomic_set(&sess
->session_reinstatement
, 1);
4360 iscsit_stop_time2retain_timer(sess
);
4361 spin_unlock_bh(&se_tpg
->session_lock
);
4364 * transport_deregister_session_configfs() will clear the
4365 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4366 * can be setting it again with __transport_register_session() in
4367 * iscsi_post_login_handler() again after the iscsit_stop_session()
4368 * completes in iscsi_np context.
4370 transport_deregister_session_configfs(sess
->se_sess
);
4373 * If any other processes are accessing this session pointer we must
4374 * wait until they have completed. If we are in an interrupt (the
4375 * time2retain handler) and contain and active session usage count we
4376 * restart the timer and exit.
4378 if (!in_interrupt()) {
4379 if (iscsit_check_session_usage_count(sess
) == 1)
4380 iscsit_stop_session(sess
, 1, 1);
4382 if (iscsit_check_session_usage_count(sess
) == 2) {
4383 atomic_set(&sess
->session_logout
, 0);
4384 iscsit_start_time2retain_handler(sess
);
4389 transport_deregister_session(sess
->se_sess
);
4391 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2)
4392 iscsit_free_connection_recovery_entires(sess
);
4394 iscsit_free_all_ooo_cmdsns(sess
);
4396 spin_lock_bh(&se_tpg
->session_lock
);
4397 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4398 sess
->session_state
= TARG_SESS_STATE_FREE
;
4399 pr_debug("Released iSCSI session from node: %s\n",
4400 sess
->sess_ops
->InitiatorName
);
4403 tpg
->tpg_tiqn
->tiqn_nsessions
--;
4405 pr_debug("Decremented number of active iSCSI Sessions on"
4406 " iSCSI TPG: %hu to %u\n", tpg
->tpgt
, tpg
->nsessions
);
4408 spin_lock(&sess_idr_lock
);
4409 idr_remove(&sess_idr
, sess
->session_index
);
4410 spin_unlock(&sess_idr_lock
);
4412 kfree(sess
->sess_ops
);
4413 sess
->sess_ops
= NULL
;
4414 spin_unlock_bh(&se_tpg
->session_lock
);
4420 static void iscsit_logout_post_handler_closesession(
4421 struct iscsi_conn
*conn
)
4423 struct iscsi_session
*sess
= conn
->sess
;
4426 * Traditional iscsi/tcp will invoke this logic from TX thread
4427 * context during session logout, so clear tx_thread_active and
4428 * sleep if iscsit_close_connection() has not already occured.
4430 * Since iser-target invokes this logic from it's own workqueue,
4431 * always sleep waiting for RX/TX thread shutdown to complete
4432 * within iscsit_close_connection().
4434 if (!conn
->conn_transport
->rdma_shutdown
) {
4435 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4440 atomic_set(&conn
->conn_logout_remove
, 0);
4441 complete(&conn
->conn_logout_comp
);
4443 iscsit_dec_conn_usage_count(conn
);
4444 iscsit_stop_session(sess
, sleep
, sleep
);
4445 iscsit_dec_session_usage_count(sess
);
4446 iscsit_close_session(sess
);
4449 static void iscsit_logout_post_handler_samecid(
4450 struct iscsi_conn
*conn
)
4454 if (!conn
->conn_transport
->rdma_shutdown
) {
4455 sleep
= cmpxchg(&conn
->tx_thread_active
, true, false);
4460 atomic_set(&conn
->conn_logout_remove
, 0);
4461 complete(&conn
->conn_logout_comp
);
4463 iscsit_cause_connection_reinstatement(conn
, sleep
);
4464 iscsit_dec_conn_usage_count(conn
);
4467 static void iscsit_logout_post_handler_diffcid(
4468 struct iscsi_conn
*conn
,
4471 struct iscsi_conn
*l_conn
;
4472 struct iscsi_session
*sess
= conn
->sess
;
4473 bool conn_found
= false;
4478 spin_lock_bh(&sess
->conn_lock
);
4479 list_for_each_entry(l_conn
, &sess
->sess_conn_list
, conn_list
) {
4480 if (l_conn
->cid
== cid
) {
4481 iscsit_inc_conn_usage_count(l_conn
);
4486 spin_unlock_bh(&sess
->conn_lock
);
4492 l_conn
->sock
->ops
->shutdown(l_conn
->sock
, RCV_SHUTDOWN
);
4494 spin_lock_bh(&l_conn
->state_lock
);
4495 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4496 l_conn
->conn_state
= TARG_CONN_STATE_IN_LOGOUT
;
4497 spin_unlock_bh(&l_conn
->state_lock
);
4499 iscsit_cause_connection_reinstatement(l_conn
, 1);
4500 iscsit_dec_conn_usage_count(l_conn
);
4504 * Return of 0 causes the TX thread to restart.
4506 int iscsit_logout_post_handler(
4507 struct iscsi_cmd
*cmd
,
4508 struct iscsi_conn
*conn
)
4512 switch (cmd
->logout_reason
) {
4513 case ISCSI_LOGOUT_REASON_CLOSE_SESSION
:
4514 switch (cmd
->logout_response
) {
4515 case ISCSI_LOGOUT_SUCCESS
:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4518 iscsit_logout_post_handler_closesession(conn
);
4523 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION
:
4524 if (conn
->cid
== cmd
->logout_cid
) {
4525 switch (cmd
->logout_response
) {
4526 case ISCSI_LOGOUT_SUCCESS
:
4527 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4529 iscsit_logout_post_handler_samecid(conn
);
4534 switch (cmd
->logout_response
) {
4535 case ISCSI_LOGOUT_SUCCESS
:
4536 iscsit_logout_post_handler_diffcid(conn
,
4539 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4540 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4547 case ISCSI_LOGOUT_REASON_RECOVERY
:
4548 switch (cmd
->logout_response
) {
4549 case ISCSI_LOGOUT_SUCCESS
:
4550 case ISCSI_LOGOUT_CID_NOT_FOUND
:
4551 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED
:
4552 case ISCSI_LOGOUT_CLEANUP_FAILED
:
4564 EXPORT_SYMBOL(iscsit_logout_post_handler
);
4566 void iscsit_fail_session(struct iscsi_session
*sess
)
4568 struct iscsi_conn
*conn
;
4570 spin_lock_bh(&sess
->conn_lock
);
4571 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
) {
4572 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4573 conn
->conn_state
= TARG_CONN_STATE_CLEANUP_WAIT
;
4575 spin_unlock_bh(&sess
->conn_lock
);
4577 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4578 sess
->session_state
= TARG_SESS_STATE_FAILED
;
4581 int iscsit_free_session(struct iscsi_session
*sess
)
4583 u16 conn_count
= atomic_read(&sess
->nconn
);
4584 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4587 spin_lock_bh(&sess
->conn_lock
);
4588 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4590 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4592 if (conn_count
== 0)
4595 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4598 iscsit_inc_conn_usage_count(conn_tmp
);
4601 iscsit_inc_conn_usage_count(conn
);
4603 spin_unlock_bh(&sess
->conn_lock
);
4604 iscsit_cause_connection_reinstatement(conn
, 1);
4605 spin_lock_bh(&sess
->conn_lock
);
4607 iscsit_dec_conn_usage_count(conn
);
4609 iscsit_dec_conn_usage_count(conn_tmp
);
4614 if (atomic_read(&sess
->nconn
)) {
4615 spin_unlock_bh(&sess
->conn_lock
);
4616 wait_for_completion(&sess
->session_wait_comp
);
4618 spin_unlock_bh(&sess
->conn_lock
);
4620 iscsit_close_session(sess
);
4624 void iscsit_stop_session(
4625 struct iscsi_session
*sess
,
4627 int connection_sleep
)
4629 u16 conn_count
= atomic_read(&sess
->nconn
);
4630 struct iscsi_conn
*conn
, *conn_tmp
= NULL
;
4633 spin_lock_bh(&sess
->conn_lock
);
4635 atomic_set(&sess
->sleep_on_sess_wait_comp
, 1);
4637 if (connection_sleep
) {
4638 list_for_each_entry_safe(conn
, conn_tmp
, &sess
->sess_conn_list
,
4640 if (conn_count
== 0)
4643 if (list_is_last(&conn
->conn_list
, &sess
->sess_conn_list
)) {
4646 iscsit_inc_conn_usage_count(conn_tmp
);
4649 iscsit_inc_conn_usage_count(conn
);
4651 spin_unlock_bh(&sess
->conn_lock
);
4652 iscsit_cause_connection_reinstatement(conn
, 1);
4653 spin_lock_bh(&sess
->conn_lock
);
4655 iscsit_dec_conn_usage_count(conn
);
4657 iscsit_dec_conn_usage_count(conn_tmp
);
4661 list_for_each_entry(conn
, &sess
->sess_conn_list
, conn_list
)
4662 iscsit_cause_connection_reinstatement(conn
, 0);
4665 if (session_sleep
&& atomic_read(&sess
->nconn
)) {
4666 spin_unlock_bh(&sess
->conn_lock
);
4667 wait_for_completion(&sess
->session_wait_comp
);
4669 spin_unlock_bh(&sess
->conn_lock
);
4672 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group
*tpg
, int force
)
4674 struct iscsi_session
*sess
;
4675 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
4676 struct se_session
*se_sess
, *se_sess_tmp
;
4677 LIST_HEAD(free_list
);
4678 int session_count
= 0;
4680 spin_lock_bh(&se_tpg
->session_lock
);
4681 if (tpg
->nsessions
&& !force
) {
4682 spin_unlock_bh(&se_tpg
->session_lock
);
4686 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
4688 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4690 spin_lock(&sess
->conn_lock
);
4691 if (atomic_read(&sess
->session_fall_back_to_erl0
) ||
4692 atomic_read(&sess
->session_logout
) ||
4693 (sess
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
4694 spin_unlock(&sess
->conn_lock
);
4697 atomic_set(&sess
->session_reinstatement
, 1);
4698 atomic_set(&sess
->session_fall_back_to_erl0
, 1);
4699 spin_unlock(&sess
->conn_lock
);
4701 list_move_tail(&se_sess
->sess_list
, &free_list
);
4703 spin_unlock_bh(&se_tpg
->session_lock
);
4705 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &free_list
, sess_list
) {
4706 sess
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
4708 iscsit_free_session(sess
);
4712 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4713 " Group: %hu\n", session_count
, tpg
->tpgt
);
4717 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4718 MODULE_VERSION("4.1.x");
4719 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4720 MODULE_LICENSE("GPL");
4722 module_init(iscsi_target_init_module
);
4723 module_exit(iscsi_target_cleanup_module
);