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scsi: convert to idr_alloc()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/string.h>
22#include <linux/kthread.h>
23#include <linux/crypto.h>
24#include <linux/completion.h>
827509e3 25#include <linux/module.h>
40401530 26#include <linux/idr.h>
e48354ce
NB		 27#include <asm/unaligned.h>
28#include <scsi/scsi_device.h>
29#include <scsi/iscsi_proto.h>
d28b1169 30#include <scsi/scsi_tcq.h>
e48354ce 31#include <target/target_core_base.h>
c4795fb2 32#include <target/target_core_fabric.h>
d28b1169 33#include <target/target_core_configfs.h>
e48354ce
NB		 34
35#include "iscsi_target_core.h"
36#include "iscsi_target_parameters.h"
37#include "iscsi_target_seq_pdu_list.h"
38#include "iscsi_target_tq.h"
39#include "iscsi_target_configfs.h"
40#include "iscsi_target_datain_values.h"
41#include "iscsi_target_erl0.h"
42#include "iscsi_target_erl1.h"
43#include "iscsi_target_erl2.h"
44#include "iscsi_target_login.h"
45#include "iscsi_target_tmr.h"
46#include "iscsi_target_tpg.h"
47#include "iscsi_target_util.h"
48#include "iscsi_target.h"
49#include "iscsi_target_device.h"
50#include "iscsi_target_stat.h"
51
52static LIST_HEAD(g_tiqn_list);
53static LIST_HEAD(g_np_list);
54static DEFINE_SPINLOCK(tiqn_lock);
55static DEFINE_SPINLOCK(np_lock);
56
57static struct idr tiqn_idr;
58struct idr sess_idr;
59struct mutex auth_id_lock;
60spinlock_t sess_idr_lock;
61
62struct iscsit_global *iscsit_global;
63
64struct kmem_cache *lio_cmd_cache;
65struct kmem_cache *lio_qr_cache;
66struct kmem_cache *lio_dr_cache;
67struct kmem_cache *lio_ooo_cache;
68struct kmem_cache *lio_r2t_cache;
69
70static int iscsit_handle_immediate_data(struct iscsi_cmd *,
71 unsigned char *buf, u32);
72static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
73
74struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
75{
76 struct iscsi_tiqn *tiqn = NULL;
77
78 spin_lock(&tiqn_lock);
79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
80 if (!strcmp(tiqn->tiqn, buf)) {
81
82 spin_lock(&tiqn->tiqn_state_lock);
83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
84 tiqn->tiqn_access_count++;
85 spin_unlock(&tiqn->tiqn_state_lock);
86 spin_unlock(&tiqn_lock);
87 return tiqn;
88 }
89 spin_unlock(&tiqn->tiqn_state_lock);
90 }
91 }
92 spin_unlock(&tiqn_lock);
93
94 return NULL;
95}
96
97static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
98{
99 spin_lock(&tiqn->tiqn_state_lock);
100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
102 spin_unlock(&tiqn->tiqn_state_lock);
103 return 0;
104 }
105 spin_unlock(&tiqn->tiqn_state_lock);
106
107 return -1;
108}
109
110void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
111{
112 spin_lock(&tiqn->tiqn_state_lock);
113 tiqn->tiqn_access_count--;
114 spin_unlock(&tiqn->tiqn_state_lock);
115}
116
117/*
118 * Note that IQN formatting is expected to be done in userspace, and
119 * no explict IQN format checks are done here.
120 */
121struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
122{
123 struct iscsi_tiqn *tiqn = NULL;
124 int ret;
125
8f50c7f5 126 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 127 pr_err("Target IQN exceeds %d bytes\n",
128 ISCSI_IQN_LEN);
129 return ERR_PTR(-EINVAL);
130 }
131
132 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
133 if (!tiqn) {
134 pr_err("Unable to allocate struct iscsi_tiqn\n");
135 return ERR_PTR(-ENOMEM);
136 }
137
138 sprintf(tiqn->tiqn, "%s", buf);
139 INIT_LIST_HEAD(&tiqn->tiqn_list);
140 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
141 spin_lock_init(&tiqn->tiqn_state_lock);
142 spin_lock_init(&tiqn->tiqn_tpg_lock);
143 spin_lock_init(&tiqn->sess_err_stats.lock);
144 spin_lock_init(&tiqn->login_stats.lock);
145 spin_lock_init(&tiqn->logout_stats.lock);
146
147 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
148 pr_err("idr_pre_get() for tiqn_idr failed\n");
149 kfree(tiqn);
150 return ERR_PTR(-ENOMEM);
151 }
152 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
153
154 spin_lock(&tiqn_lock);
155 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
156 if (ret < 0) {
157 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
158 spin_unlock(&tiqn_lock);
159 kfree(tiqn);
160 return ERR_PTR(ret);
161 }
162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
163 spin_unlock(&tiqn_lock);
164
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
166
167 return tiqn;
168
169}
170
171static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172{
173 /*
174 * Wait for accesses to said struct iscsi_tiqn to end.
175 */
176 spin_lock(&tiqn->tiqn_state_lock);
177 while (tiqn->tiqn_access_count != 0) {
178 spin_unlock(&tiqn->tiqn_state_lock);
179 msleep(10);
180 spin_lock(&tiqn->tiqn_state_lock);
181 }
182 spin_unlock(&tiqn->tiqn_state_lock);
183}
184
185void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186{
187 /*
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
192 */
193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 return;
196 }
197
198 iscsit_wait_for_tiqn(tiqn);
199
200 spin_lock(&tiqn_lock);
201 list_del(&tiqn->tiqn_list);
202 idr_remove(&tiqn_idr, tiqn->tiqn_index);
203 spin_unlock(&tiqn_lock);
204
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
206 tiqn->tiqn);
207 kfree(tiqn);
208}
209
210int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211{
212 int ret;
213 /*
214 * Determine if the network portal is accepting storage traffic.
215 */
216 spin_lock_bh(&np->np_thread_lock);
217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
218 spin_unlock_bh(&np->np_thread_lock);
219 return -1;
220 }
221 if (np->np_login_tpg) {
222 pr_err("np->np_login_tpg() is not NULL!\n");
223 spin_unlock_bh(&np->np_thread_lock);
224 return -1;
225 }
226 spin_unlock_bh(&np->np_thread_lock);
227 /*
228 * Determine if the portal group is accepting storage traffic.
229 */
230 spin_lock_bh(&tpg->tpg_state_lock);
231 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
232 spin_unlock_bh(&tpg->tpg_state_lock);
233 return -1;
234 }
235 spin_unlock_bh(&tpg->tpg_state_lock);
236
237 /*
238 * Here we serialize access across the TIQN+TPG Tuple.
239 */
240 ret = mutex_lock_interruptible(&tpg->np_login_lock);
241 if ((ret != 0) || signal_pending(current))
242 return -1;
243
244 spin_lock_bh(&np->np_thread_lock);
245 np->np_login_tpg = tpg;
246 spin_unlock_bh(&np->np_thread_lock);
247
248 return 0;
249}
250
251int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
252{
253 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
254
255 spin_lock_bh(&np->np_thread_lock);
256 np->np_login_tpg = NULL;
257 spin_unlock_bh(&np->np_thread_lock);
258
259 mutex_unlock(&tpg->np_login_lock);
260
261 if (tiqn)
262 iscsit_put_tiqn_for_login(tiqn);
263
264 return 0;
265}
266
05b96892 267bool iscsit_check_np_match(
e48354ce 268 struct __kernel_sockaddr_storage *sockaddr,
05b96892 269 struct iscsi_np *np,
e48354ce
NB		 270 int network_transport)
271{
272 struct sockaddr_in *sock_in, *sock_in_e;
273 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 274 bool ip_match = false;
e48354ce
NB		 275 u16 port;
276
05b96892
NB		 277 if (sockaddr->ss_family == AF_INET6) {
278 sock_in6 = (struct sockaddr_in6 *)sockaddr;
279 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
280
281 if (!memcmp(&sock_in6->sin6_addr.in6_u,
282 &sock_in6_e->sin6_addr.in6_u,
283 sizeof(struct in6_addr)))
284 ip_match = true;
285
286 port = ntohs(sock_in6->sin6_port);
287 } else {
288 sock_in = (struct sockaddr_in *)sockaddr;
289 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
290
291 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
292 ip_match = true;
293
294 port = ntohs(sock_in->sin_port);
295 }
296
297 if ((ip_match == true) && (np->np_port == port) &&
298 (np->np_network_transport == network_transport))
299 return true;
300
301 return false;
302}
303
304static struct iscsi_np *iscsit_get_np(
305 struct __kernel_sockaddr_storage *sockaddr,
306 int network_transport)
307{
308 struct iscsi_np *np;
309 bool match;
310
e48354ce
NB		 311 spin_lock_bh(&np_lock);
312 list_for_each_entry(np, &g_np_list, np_list) {
313 spin_lock(&np->np_thread_lock);
314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
315 spin_unlock(&np->np_thread_lock);
316 continue;
317 }
318
05b96892
NB		 319 match = iscsit_check_np_match(sockaddr, np, network_transport);
320 if (match == true) {
e48354ce
NB		 321 /*
322 * Increment the np_exports reference count now to
323 * prevent iscsit_del_np() below from being called
324 * while iscsi_tpg_add_network_portal() is called.
325 */
326 np->np_exports++;
327 spin_unlock(&np->np_thread_lock);
328 spin_unlock_bh(&np_lock);
329 return np;
330 }
331 spin_unlock(&np->np_thread_lock);
332 }
333 spin_unlock_bh(&np_lock);
334
335 return NULL;
336}
337
338struct iscsi_np *iscsit_add_np(
339 struct __kernel_sockaddr_storage *sockaddr,
340 char *ip_str,
341 int network_transport)
342{
343 struct sockaddr_in *sock_in;
344 struct sockaddr_in6 *sock_in6;
345 struct iscsi_np *np;
346 int ret;
347 /*
348 * Locate the existing struct iscsi_np if already active..
349 */
350 np = iscsit_get_np(sockaddr, network_transport);
351 if (np)
352 return np;
353
354 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
355 if (!np) {
356 pr_err("Unable to allocate memory for struct iscsi_np\n");
357 return ERR_PTR(-ENOMEM);
358 }
359
360 np->np_flags |= NPF_IP_NETWORK;
361 if (sockaddr->ss_family == AF_INET6) {
362 sock_in6 = (struct sockaddr_in6 *)sockaddr;
363 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
364 np->np_port = ntohs(sock_in6->sin6_port);
365 } else {
366 sock_in = (struct sockaddr_in *)sockaddr;
367 sprintf(np->np_ip, "%s", ip_str);
368 np->np_port = ntohs(sock_in->sin_port);
369 }
370
371 np->np_network_transport = network_transport;
372 spin_lock_init(&np->np_thread_lock);
373 init_completion(&np->np_restart_comp);
374 INIT_LIST_HEAD(&np->np_list);
375
376 ret = iscsi_target_setup_login_socket(np, sockaddr);
377 if (ret != 0) {
378 kfree(np);
379 return ERR_PTR(ret);
380 }
381
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);
386 kfree(np);
387 return ERR_PTR(ret);
388 }
389 /*
390 * Increment the np_exports reference count now to prevent
391 * iscsit_del_np() below from being run while a new call to
392 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
393 * active. We don't need to hold np->np_thread_lock at this
394 * point because iscsi_np has not been added to g_np_list yet.
395 */
396 np->np_exports = 1;
397
398 spin_lock_bh(&np_lock);
399 list_add_tail(&np->np_list, &g_np_list);
400 spin_unlock_bh(&np_lock);
401
402 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
403 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
404 "TCP" : "SCTP");
405
406 return np;
407}
408
409int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
412 struct iscsi_portal_group *tpg)
413{
414 spin_lock_bh(&np->np_thread_lock);
415 if (tpg && tpg_np) {
416 /*
417 * The reset operation need only be performed when the
418 * passed struct iscsi_portal_group has a login in progress
419 * to one of the network portals.
420 */
421 if (tpg_np->tpg_np->np_login_tpg != tpg) {
422 spin_unlock_bh(&np->np_thread_lock);
423 return 0;
424 }
425 }
426 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
427 spin_unlock_bh(&np->np_thread_lock);
428 return 0;
429 }
430 np->np_thread_state = ISCSI_NP_THREAD_RESET;
431
432 if (np->np_thread) {
433 spin_unlock_bh(&np->np_thread_lock);
434 send_sig(SIGINT, np->np_thread, 1);
435 wait_for_completion(&np->np_restart_comp);
436 spin_lock_bh(&np->np_thread_lock);
437 }
438 spin_unlock_bh(&np->np_thread_lock);
439
440 return 0;
441}
442
fceb5bc7 443static int iscsit_del_np_comm(struct iscsi_np *np)
e48354ce 444{
bf6932f4
AV		 445 if (np->np_socket)
446 sock_release(np->np_socket);
e48354ce
NB		 447 return 0;
448}
449
450int iscsit_del_np(struct iscsi_np *np)
451{
452 spin_lock_bh(&np->np_thread_lock);
453 np->np_exports--;
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
456 return 0;
457 }
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
460
461 if (np->np_thread) {
462 /*
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
465 */
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
468 }
469 iscsit_del_np_comm(np);
470
471 spin_lock_bh(&np_lock);
472 list_del(&np->np_list);
473 spin_unlock_bh(&np_lock);
474
475 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
476 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
477 "TCP" : "SCTP");
478
479 kfree(np);
480 return 0;
481}
482
483static int __init iscsi_target_init_module(void)
484{
485 int ret = 0;
486
487 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
488
489 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
490 if (!iscsit_global) {
491 pr_err("Unable to allocate memory for iscsit_global\n");
492 return -1;
493 }
494 mutex_init(&auth_id_lock);
495 spin_lock_init(&sess_idr_lock);
496 idr_init(&tiqn_idr);
497 idr_init(&sess_idr);
498
499 ret = iscsi_target_register_configfs();
500 if (ret < 0)
501 goto out;
502
503 ret = iscsi_thread_set_init();
504 if (ret < 0)
505 goto configfs_out;
506
507 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
508 TARGET_THREAD_SET_COUNT) {
509 pr_err("iscsi_allocate_thread_sets() returned"
510 " unexpected value!\n");
511 goto ts_out1;
512 }
513
514 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
515 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
516 0, NULL);
517 if (!lio_cmd_cache) {
518 pr_err("Unable to kmem_cache_create() for"
519 " lio_cmd_cache\n");
520 goto ts_out2;
521 }
522
523 lio_qr_cache = kmem_cache_create("lio_qr_cache",
524 sizeof(struct iscsi_queue_req),
525 __alignof__(struct iscsi_queue_req), 0, NULL);
526 if (!lio_qr_cache) {
527 pr_err("nable to kmem_cache_create() for"
528 " lio_qr_cache\n");
529 goto cmd_out;
530 }
531
532 lio_dr_cache = kmem_cache_create("lio_dr_cache",
533 sizeof(struct iscsi_datain_req),
534 __alignof__(struct iscsi_datain_req), 0, NULL);
535 if (!lio_dr_cache) {
536 pr_err("Unable to kmem_cache_create() for"
537 " lio_dr_cache\n");
538 goto qr_out;
539 }
540
541 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
542 sizeof(struct iscsi_ooo_cmdsn),
543 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
544 if (!lio_ooo_cache) {
545 pr_err("Unable to kmem_cache_create() for"
546 " lio_ooo_cache\n");
547 goto dr_out;
548 }
549
550 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
551 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
552 0, NULL);
553 if (!lio_r2t_cache) {
554 pr_err("Unable to kmem_cache_create() for"
555 " lio_r2t_cache\n");
556 goto ooo_out;
557 }
558
559 if (iscsit_load_discovery_tpg() < 0)
560 goto r2t_out;
561
562 return ret;
563r2t_out:
564 kmem_cache_destroy(lio_r2t_cache);
565ooo_out:
566 kmem_cache_destroy(lio_ooo_cache);
567dr_out:
568 kmem_cache_destroy(lio_dr_cache);
569qr_out:
570 kmem_cache_destroy(lio_qr_cache);
571cmd_out:
572 kmem_cache_destroy(lio_cmd_cache);
573ts_out2:
574 iscsi_deallocate_thread_sets();
575ts_out1:
576 iscsi_thread_set_free();
577configfs_out:
578 iscsi_target_deregister_configfs();
579out:
580 kfree(iscsit_global);
581 return -ENOMEM;
582}
583
584static void __exit iscsi_target_cleanup_module(void)
585{
586 iscsi_deallocate_thread_sets();
587 iscsi_thread_set_free();
588 iscsit_release_discovery_tpg();
589 kmem_cache_destroy(lio_cmd_cache);
590 kmem_cache_destroy(lio_qr_cache);
591 kmem_cache_destroy(lio_dr_cache);
592 kmem_cache_destroy(lio_ooo_cache);
593 kmem_cache_destroy(lio_r2t_cache);
594
595 iscsi_target_deregister_configfs();
596
597 kfree(iscsit_global);
598}
599
8b1e1244 600static int iscsit_add_reject(
e48354ce
NB		 601 u8 reason,
602 int fail_conn,
603 unsigned char *buf,
604 struct iscsi_conn *conn)
605{
606 struct iscsi_cmd *cmd;
607 struct iscsi_reject *hdr;
608 int ret;
609
610 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
611 if (!cmd)
612 return -1;
613
614 cmd->iscsi_opcode = ISCSI_OP_REJECT;
615 if (fail_conn)
616 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
617
618 hdr = (struct iscsi_reject *) cmd->pdu;
619 hdr->reason = reason;
620
1c3d5794 621 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 622 if (!cmd->buf_ptr) {
623 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
624 iscsit_release_cmd(cmd);
625 return -1;
626 }
e48354ce
NB		 627
628 spin_lock_bh(&conn->cmd_lock);
2fbb471e 629 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 630 spin_unlock_bh(&conn->cmd_lock);
631
632 cmd->i_state = ISTATE_SEND_REJECT;
633 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
634
635 ret = wait_for_completion_interruptible(&cmd->reject_comp);
636 if (ret != 0)
637 return -1;
638
639 return (!fail_conn) ? 0 : -1;
640}
641
642int iscsit_add_reject_from_cmd(
643 u8 reason,
644 int fail_conn,
645 int add_to_conn,
646 unsigned char *buf,
647 struct iscsi_cmd *cmd)
648{
649 struct iscsi_conn *conn;
650 struct iscsi_reject *hdr;
651 int ret;
652
653 if (!cmd->conn) {
654 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
655 cmd->init_task_tag);
656 return -1;
657 }
658 conn = cmd->conn;
659
660 cmd->iscsi_opcode = ISCSI_OP_REJECT;
661 if (fail_conn)
662 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
663
664 hdr = (struct iscsi_reject *) cmd->pdu;
665 hdr->reason = reason;
666
1c3d5794 667 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 668 if (!cmd->buf_ptr) {
669 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
670 iscsit_release_cmd(cmd);
671 return -1;
672 }
e48354ce
NB		 673
674 if (add_to_conn) {
675 spin_lock_bh(&conn->cmd_lock);
2fbb471e 676 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 677 spin_unlock_bh(&conn->cmd_lock);
678 }
679
680 cmd->i_state = ISTATE_SEND_REJECT;
681 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
682
683 ret = wait_for_completion_interruptible(&cmd->reject_comp);
684 if (ret != 0)
685 return -1;
686
687 return (!fail_conn) ? 0 : -1;
688}
689
690/*
691 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 692 * kernel sockets to copy data in/out.
e48354ce
NB		 693 */
694static int iscsit_map_iovec(
695 struct iscsi_cmd *cmd,
696 struct kvec *iov,
697 u32 data_offset,
698 u32 data_length)
699{
700 u32 i = 0;
701 struct scatterlist *sg;
702 unsigned int page_off;
703
704 /*
bfb79eac 705 * We know each entry in t_data_sg contains a page.
e48354ce 706 */
bfb79eac 707 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 708 page_off = (data_offset % PAGE_SIZE);
709
710 cmd->first_data_sg = sg;
711 cmd->first_data_sg_off = page_off;
712
713 while (data_length) {
714 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
715
716 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
717 iov[i].iov_len = cur_len;
718
719 data_length -= cur_len;
720 page_off = 0;
721 sg = sg_next(sg);
722 i++;
723 }
724
725 cmd->kmapped_nents = i;
726
727 return i;
728}
729
730static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
731{
732 u32 i;
733 struct scatterlist *sg;
734
735 sg = cmd->first_data_sg;
736
737 for (i = 0; i < cmd->kmapped_nents; i++)
738 kunmap(sg_page(&sg[i]));
739}
740
741static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
742{
743 struct iscsi_cmd *cmd;
744
745 conn->exp_statsn = exp_statsn;
746
747 spin_lock_bh(&conn->cmd_lock);
2fbb471e 748 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 749 spin_lock(&cmd->istate_lock);
750 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 751 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 752 cmd->i_state = ISTATE_REMOVE;
753 spin_unlock(&cmd->istate_lock);
754 iscsit_add_cmd_to_immediate_queue(cmd, conn,
755 cmd->i_state);
756 continue;
757 }
758 spin_unlock(&cmd->istate_lock);
759 }
760 spin_unlock_bh(&conn->cmd_lock);
761}
762
763static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
764{
f80e8ed3 765 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 766
c0427f15 767 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 768
769 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
770 if (!cmd->iov_data) {
771 pr_err("Unable to allocate cmd->iov_data\n");
772 return -ENOMEM;
773 }
774
775 cmd->orig_iov_data_count = iov_count;
776 return 0;
777}
778
e48354ce
NB		 779static int iscsit_handle_scsi_cmd(
780 struct iscsi_conn *conn,
781 unsigned char *buf)
782{
de103c93
CH		 783 int data_direction, payload_length, cmdsn_ret = 0, immed_ret;
784 struct iscsi_cmd *cmd = NULL;
e48354ce 785 struct iscsi_scsi_req *hdr;
d28b1169
AG		 786 int iscsi_task_attr;
787 int sam_task_attr;
e48354ce
NB		 788
789 spin_lock_bh(&conn->sess->session_stats_lock);
790 conn->sess->cmd_pdus++;
791 if (conn->sess->se_sess->se_node_acl) {
792 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
793 conn->sess->se_sess->se_node_acl->num_cmds++;
794 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
795 }
796 spin_unlock_bh(&conn->sess->session_stats_lock);
797
798 hdr = (struct iscsi_scsi_req *) buf;
799 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 800
801 /* FIXME; Add checks for AdditionalHeaderSegment */
802
803 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
804 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
805 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
806 " not set. Bad iSCSI Initiator.\n");
807 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
808 buf, conn);
809 }
810
811 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
812 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
813 /*
814 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
815 * that adds support for RESERVE/RELEASE. There is a bug
816 * add with this new functionality that sets R/W bits when
817 * neither CDB carries any READ or WRITE datapayloads.
818 */
819 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
820 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
821 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
822 goto done;
823 }
824
825 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
826 " set when Expected Data Transfer Length is 0 for"
827 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
828 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
829 buf, conn);
830 }
831done:
832
833 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
834 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
835 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
836 " MUST be set if Expected Data Transfer Length is not 0."
837 " Bad iSCSI Initiator\n");
838 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
839 buf, conn);
840 }
841
842 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
843 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
844 pr_err("Bidirectional operations not supported!\n");
845 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
846 buf, conn);
847 }
848
849 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
850 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
851 " Scsi Command PDU.\n");
852 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
853 buf, conn);
854 }
855
856 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
857 pr_err("ImmediateData=No but DataSegmentLength=%u,"
858 " protocol error.\n", payload_length);
859 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
860 buf, conn);
861 }
862
50e5c87d 863 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
e48354ce
NB		 864 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
865 pr_err("Expected Data Transfer Length and Length of"
866 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
867 " bit is not set protocol error\n");
868 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
869 buf, conn);
870 }
871
50e5c87d 872 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 873 pr_err("DataSegmentLength: %u is greater than"
874 " EDTL: %u, protocol error.\n", payload_length,
875 hdr->data_length);
876 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
877 buf, conn);
878 }
879
21f5aa7e 880 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 881 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 882 " MaxXmitDataSegmentLength: %u, protocol error.\n",
883 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 884 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
885 buf, conn);
886 }
887
888 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
889 pr_err("DataSegmentLength: %u is greater than"
890 " FirstBurstLength: %u, protocol error.\n",
891 payload_length, conn->sess->sess_ops->FirstBurstLength);
892 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
893 buf, conn);
894 }
895
896 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
897 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
898 DMA_NONE;
899
d28b1169 900 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
e48354ce
NB		 901 if (!cmd)
902 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
d28b1169
AG		 903 buf, conn);
904
905 cmd->data_direction = data_direction;
d28b1169
AG		 906 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
907 /*
908 * Figure out the SAM Task Attribute for the incoming SCSI CDB
909 */
910 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
911 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
912 sam_task_attr = MSG_SIMPLE_TAG;
913 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
914 sam_task_attr = MSG_ORDERED_TAG;
915 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
916 sam_task_attr = MSG_HEAD_TAG;
917 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
918 sam_task_attr = MSG_ACA_TAG;
919 else {
920 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
921 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
922 sam_task_attr = MSG_SIMPLE_TAG;
923 }
924
e48354ce
NB		 925 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
926 cmd->i_state = ISTATE_NEW_CMD;
927 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
928 cmd->immediate_data = (payload_length) ? 1 : 0;
929 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
930 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
931 if (cmd->unsolicited_data)
932 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
933
934 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
935 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
936 spin_lock_bh(&conn->sess->ttt_lock);
937 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
938 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
939 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
940 spin_unlock_bh(&conn->sess->ttt_lock);
941 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
942 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 943 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
944 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 945 cmd->first_burst_len = payload_length;
946
947 if (cmd->data_direction == DMA_FROM_DEVICE) {
948 struct iscsi_datain_req *dr;
949
950 dr = iscsit_allocate_datain_req();
951 if (!dr)
952 return iscsit_add_reject_from_cmd(
953 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
954 1, 1, buf, cmd);
955
956 iscsit_attach_datain_req(cmd, dr);
957 }
958
065ca1e4
AG		 959 /*
960 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
961 */
962 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 963 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
964 cmd->data_direction, sam_task_attr,
965 cmd->sense_buffer + 2);
065ca1e4
AG		 966
967 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
968 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
969 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
970
de103c93
CH		 971 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
972 scsilun_to_int(&hdr->lun));
973 if (cmd->sense_reason)
974 goto attach_cmd;
975
976 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
977 if (cmd->sense_reason) {
978 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
979 return iscsit_add_reject_from_cmd(
980 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
981 1, 1, buf, cmd);
e48354ce 982 }
de103c93 983
e48354ce
NB		 984 goto attach_cmd;
985 }
a12f41f8 986
de103c93 987 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
e48354ce 988 return iscsit_add_reject_from_cmd(
de103c93
CH		 989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
990 1, 1, buf, cmd);
e48354ce
NB		 991 }
992
993attach_cmd:
994 spin_lock_bh(&conn->cmd_lock);
2fbb471e 995 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 996 spin_unlock_bh(&conn->cmd_lock);
997 /*
998 * Check if we need to delay processing because of ALUA
999 * Active/NonOptimized primary access state..
1000 */
1001 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1002
de103c93 1003 if (iscsit_allocate_iovecs(cmd) < 0) {
e48354ce
NB		 1004 return iscsit_add_reject_from_cmd(
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
cd931ee6 1006 1, 0, buf, cmd);
de103c93
CH		 1007 }
1008
e48354ce
NB		 1009 /*
1010 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1011 * the Immediate Bit is not set, and no Immediate
1012 * Data is attached.
1013 *
1014 * A PDU/CmdSN carrying Immediate Data can only
1015 * be processed after the DataCRC has passed.
1016 * If the DataCRC fails, the CmdSN MUST NOT
1017 * be acknowledged. (See below)
1018 */
1019 if (!cmd->immediate_data) {
1020 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
7e32da55
NB		 1021 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1022 return 0;
1023 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
e48354ce
NB		 1024 return iscsit_add_reject_from_cmd(
1025 ISCSI_REASON_PROTOCOL_ERROR,
1026 1, 0, buf, cmd);
1027 }
1028
50e5c87d 1029 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1030
1031 /*
1032 * If no Immediate Data is attached, it's OK to return now.
1033 */
1034 if (!cmd->immediate_data) {
de103c93 1035 if (!cmd->sense_reason && cmd->unsolicited_data) {
e48354ce
NB		 1036 iscsit_set_dataout_sequence_values(cmd);
1037
1038 spin_lock_bh(&cmd->dataout_timeout_lock);
1039 iscsit_start_dataout_timer(cmd, cmd->conn);
1040 spin_unlock_bh(&cmd->dataout_timeout_lock);
1041 }
1042
1043 return 0;
1044 }
1045
1046 /*
1047 * Early CHECK_CONDITIONs never make it to the transport processing
1048 * thread. They are processed in CmdSN order by
1049 * iscsit_check_received_cmdsn() below.
1050 */
de103c93 1051 if (cmd->sense_reason) {
e48354ce 1052 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
e48354ce
NB		 1053 goto after_immediate_data;
1054 }
1055 /*
1056 * Call directly into transport_generic_new_cmd() to perform
1057 * the backend memory allocation.
1058 */
de103c93
CH		 1059 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1060 if (cmd->sense_reason) {
e48354ce 1061 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
e48354ce
NB		 1062 goto after_immediate_data;
1063 }
1064
1065 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1066after_immediate_data:
1067 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1068 /*
1069 * A PDU/CmdSN carrying Immediate Data passed
1070 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1071 * Immediate Bit is not set.
1072 */
1073 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1074 /*
1075 * Special case for Unsupported SAM WRITE Opcodes
1076 * and ImmediateData=Yes.
1077 */
de103c93 1078 if (cmd->sense_reason) {
e48354ce
NB		 1079 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1080 return -1;
1081 } else if (cmd->unsolicited_data) {
1082 iscsit_set_dataout_sequence_values(cmd);
1083
1084 spin_lock_bh(&cmd->dataout_timeout_lock);
1085 iscsit_start_dataout_timer(cmd, cmd->conn);
1086 spin_unlock_bh(&cmd->dataout_timeout_lock);
1087 }
1088
1089 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1090 return iscsit_add_reject_from_cmd(
1091 ISCSI_REASON_PROTOCOL_ERROR,
1092 1, 0, buf, cmd);
1093
1094 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1095 /*
1096 * Immediate Data failed DataCRC and ERL>=1,
1097 * silently drop this PDU and let the initiator
1098 * plug the CmdSN gap.
1099 *
1100 * FIXME: Send Unsolicited NOPIN with reserved
1101 * TTT here to help the initiator figure out
1102 * the missing CmdSN, although they should be
1103 * intelligent enough to determine the missing
1104 * CmdSN and issue a retry to plug the sequence.
1105 */
1106 cmd->i_state = ISTATE_REMOVE;
1107 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1108 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1109 return -1;
1110
1111 return 0;
1112}
1113
1114static u32 iscsit_do_crypto_hash_sg(
1115 struct hash_desc *hash,
1116 struct iscsi_cmd *cmd,
1117 u32 data_offset,
1118 u32 data_length,
1119 u32 padding,
1120 u8 *pad_bytes)
1121{
1122 u32 data_crc;
1123 u32 i;
1124 struct scatterlist *sg;
1125 unsigned int page_off;
1126
1127 crypto_hash_init(hash);
1128
1129 sg = cmd->first_data_sg;
1130 page_off = cmd->first_data_sg_off;
1131
1132 i = 0;
1133 while (data_length) {
1134 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1135
1136 crypto_hash_update(hash, &sg[i], cur_len);
1137
1138 data_length -= cur_len;
1139 page_off = 0;
1140 i++;
1141 }
1142
1143 if (padding) {
1144 struct scatterlist pad_sg;
1145
1146 sg_init_one(&pad_sg, pad_bytes, padding);
1147 crypto_hash_update(hash, &pad_sg, padding);
1148 }
1149 crypto_hash_final(hash, (u8 *) &data_crc);
1150
1151 return data_crc;
1152}
1153
1154static void iscsit_do_crypto_hash_buf(
1155 struct hash_desc *hash,
1156 unsigned char *buf,
1157 u32 payload_length,
1158 u32 padding,
1159 u8 *pad_bytes,
1160 u8 *data_crc)
1161{
1162 struct scatterlist sg;
1163
1164 crypto_hash_init(hash);
1165
8359cf43 1166 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1167 crypto_hash_update(hash, &sg, payload_length);
1168
1169 if (padding) {
1170 sg_init_one(&sg, pad_bytes, padding);
1171 crypto_hash_update(hash, &sg, padding);
1172 }
1173 crypto_hash_final(hash, data_crc);
1174}
1175
1176static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1177{
1178 int iov_ret, ooo_cmdsn = 0, ret;
1179 u8 data_crc_failed = 0;
1180 u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1181 u32 rx_size = 0, payload_length;
1182 struct iscsi_cmd *cmd = NULL;
1183 struct se_cmd *se_cmd;
1184 struct iscsi_data *hdr;
1185 struct kvec *iov;
1186 unsigned long flags;
1187
1188 hdr = (struct iscsi_data *) buf;
1189 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 1190
1191 if (!payload_length) {
1192 pr_err("DataOUT payload is ZERO, protocol error.\n");
1193 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1194 buf, conn);
1195 }
1196
1197 /* iSCSI write */
1198 spin_lock_bh(&conn->sess->session_stats_lock);
1199 conn->sess->rx_data_octets += payload_length;
1200 if (conn->sess->se_sess->se_node_acl) {
1201 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1202 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1203 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1204 }
1205 spin_unlock_bh(&conn->sess->session_stats_lock);
1206
21f5aa7e 1207 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1208 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1209 " MaxXmitDataSegmentLength: %u\n", payload_length,
1210 conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 1211 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1212 buf, conn);
1213 }
1214
1215 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1216 payload_length);
1217 if (!cmd)
1218 return 0;
1219
1220 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1221 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1222 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1223 payload_length, conn->cid);
1224
1225 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1226 pr_err("Command ITT: 0x%08x received DataOUT after"
1227 " last DataOUT received, dumping payload\n",
1228 cmd->init_task_tag);
1229 return iscsit_dump_data_payload(conn, payload_length, 1);
1230 }
1231
1232 if (cmd->data_direction != DMA_TO_DEVICE) {
1233 pr_err("Command ITT: 0x%08x received DataOUT for a"
1234 " NON-WRITE command.\n", cmd->init_task_tag);
1235 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1236 1, 0, buf, cmd);
1237 }
1238 se_cmd = &cmd->se_cmd;
1239 iscsit_mod_dataout_timer(cmd);
1240
50e5c87d 1241 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1242 pr_err("DataOut Offset: %u, Length %u greater than"
1243 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1244 hdr->offset, payload_length, cmd->se_cmd.data_length);
e48354ce
NB		 1245 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1246 1, 0, buf, cmd);
1247 }
1248
1249 if (cmd->unsolicited_data) {
1250 int dump_unsolicited_data = 0;
1251
1252 if (conn->sess->sess_ops->InitialR2T) {
1253 pr_err("Received unexpected unsolicited data"
1254 " while InitialR2T=Yes, protocol error.\n");
1255 transport_send_check_condition_and_sense(&cmd->se_cmd,
1256 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1257 return -1;
1258 }
1259 /*
1260 * Special case for dealing with Unsolicited DataOUT
1261 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1262 * failures;
1263 */
1264
1265 /* Something's amiss if we're not in WRITE_PENDING state... */
1266 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1267 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1268 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1269
1270 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
de103c93 1271 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce
NB		 1272 dump_unsolicited_data = 1;
1273 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1274
1275 if (dump_unsolicited_data) {
1276 /*
1277 * Check if a delayed TASK_ABORTED status needs to
1278 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1279 * received with the unsolicitied data out.
1280 */
1281 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1282 iscsit_stop_dataout_timer(cmd);
1283
1284 transport_check_aborted_status(se_cmd,
1285 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1286 return iscsit_dump_data_payload(conn, payload_length, 1);
1287 }
1288 } else {
1289 /*
1290 * For the normal solicited data path:
1291 *
1292 * Check for a delayed TASK_ABORTED status and dump any
1293 * incoming data out payload if one exists. Also, when the
1294 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1295 * data out sequence, we decrement outstanding_r2ts. Once
1296 * outstanding_r2ts reaches zero, go ahead and send the delayed
1297 * TASK_ABORTED status.
1298 */
7d680f3b 1299 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1300 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1301 if (--cmd->outstanding_r2ts < 1) {
1302 iscsit_stop_dataout_timer(cmd);
1303 transport_check_aborted_status(
1304 se_cmd, 1);
1305 }
1306
1307 return iscsit_dump_data_payload(conn, payload_length, 1);
1308 }
1309 }
1310 /*
1311 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1312 * within-command recovery checks before receiving the payload.
1313 */
1314 ret = iscsit_check_pre_dataout(cmd, buf);
1315 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1316 return 0;
1317 else if (ret == DATAOUT_CANNOT_RECOVER)
1318 return -1;
1319
1320 rx_size += payload_length;
1321 iov = &cmd->iov_data[0];
1322
50e5c87d
CH		 1323 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1324 payload_length);
e48354ce
NB		 1325 if (iov_ret < 0)
1326 return -1;
1327
1328 iov_count += iov_ret;
1329
1330 padding = ((-payload_length) & 3);
1331 if (padding != 0) {
1332 iov[iov_count].iov_base = cmd->pad_bytes;
1333 iov[iov_count++].iov_len = padding;
1334 rx_size += padding;
1335 pr_debug("Receiving %u padding bytes.\n", padding);
1336 }
1337
1338 if (conn->conn_ops->DataDigest) {
1339 iov[iov_count].iov_base = &checksum;
1340 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1341 rx_size += ISCSI_CRC_LEN;
1342 }
1343
1344 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1345
1346 iscsit_unmap_iovec(cmd);
1347
1348 if (rx_got != rx_size)
1349 return -1;
1350
1351 if (conn->conn_ops->DataDigest) {
1352 u32 data_crc;
1353
1354 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1355 be32_to_cpu(hdr->offset),
1356 payload_length, padding,
e48354ce
NB		 1357 cmd->pad_bytes);
1358
1359 if (checksum != data_crc) {
1360 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1361 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1362 " does not match computed 0x%08x\n",
1363 hdr->itt, hdr->offset, payload_length,
1364 hdr->datasn, checksum, data_crc);
1365 data_crc_failed = 1;
1366 } else {
1367 pr_debug("Got CRC32C DataDigest 0x%08x for"
1368 " %u bytes of Data Out\n", checksum,
1369 payload_length);
1370 }
1371 }
1372 /*
1373 * Increment post receive data and CRC values or perform
1374 * within-command recovery.
1375 */
1376 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1377 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1378 return 0;
1379 else if (ret == DATAOUT_SEND_R2T) {
1380 iscsit_set_dataout_sequence_values(cmd);
8b1e1244 1381 iscsit_build_r2ts_for_cmd(cmd, conn, false);
e48354ce
NB		 1382 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1383 /*
1384 * Handle extra special case for out of order
1385 * Unsolicited Data Out.
1386 */
1387 spin_lock_bh(&cmd->istate_lock);
1388 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1389 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1390 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1391 spin_unlock_bh(&cmd->istate_lock);
1392
1393 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1394 if (ooo_cmdsn)
1395 return 0;
1396 target_execute_cmd(&cmd->se_cmd);
1397 return 0;
e48354ce
NB		 1398 } else /* DATAOUT_CANNOT_RECOVER */
1399 return -1;
1400
1401 return 0;
1402}
1403
1404static int iscsit_handle_nop_out(
1405 struct iscsi_conn *conn,
1406 unsigned char *buf)
1407{
1408 unsigned char *ping_data = NULL;
1409 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1410 u32 checksum, data_crc, padding = 0, payload_length;
e48354ce
NB		 1411 struct iscsi_cmd *cmd = NULL;
1412 struct kvec *iov = NULL;
1413 struct iscsi_nopout *hdr;
1414
1415 hdr = (struct iscsi_nopout *) buf;
1416 payload_length = ntoh24(hdr->dlength);
e48354ce 1417
66c7db68 1418 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1419 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1420 " not set, protocol error.\n");
1421 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1422 buf, conn);
1423 }
1424
21f5aa7e 1425 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1426 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1427 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1428 " error.\n", payload_length,
21f5aa7e 1429 conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 1430 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1431 buf, conn);
1432 }
1433
1434 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1435 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1436 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1437 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1438 payload_length);
1439 /*
1440 * This is not a response to a Unsolicited NopIN, which means
1441 * it can either be a NOPOUT ping request (with a valid ITT),
1442 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1443 * Either way, make sure we allocate an struct iscsi_cmd, as both
1444 * can contain ping data.
1445 */
50e5c87d 1446 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1447 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1448 if (!cmd)
1449 return iscsit_add_reject(
1450 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1451 1, buf, conn);
1452
1453 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1454 cmd->i_state = ISTATE_SEND_NOPIN;
1455 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1456 1 : 0);
1457 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1458 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1459 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1460 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1461 cmd->data_direction = DMA_NONE;
1462 }
1463
50e5c87d 1464 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1465 rx_size = payload_length;
1466 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1467 if (!ping_data) {
1468 pr_err("Unable to allocate memory for"
1469 " NOPOUT ping data.\n");
1470 ret = -1;
1471 goto out;
1472 }
1473
1474 iov = &cmd->iov_misc[0];
1475 iov[niov].iov_base = ping_data;
1476 iov[niov++].iov_len = payload_length;
1477
1478 padding = ((-payload_length) & 3);
1479 if (padding != 0) {
1480 pr_debug("Receiving %u additional bytes"
1481 " for padding.\n", padding);
1482 iov[niov].iov_base = &cmd->pad_bytes;
1483 iov[niov++].iov_len = padding;
1484 rx_size += padding;
1485 }
1486 if (conn->conn_ops->DataDigest) {
1487 iov[niov].iov_base = &checksum;
1488 iov[niov++].iov_len = ISCSI_CRC_LEN;
1489 rx_size += ISCSI_CRC_LEN;
1490 }
1491
1492 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1493 if (rx_got != rx_size) {
1494 ret = -1;
1495 goto out;
1496 }
1497
1498 if (conn->conn_ops->DataDigest) {
1499 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1500 ping_data, payload_length,
1501 padding, cmd->pad_bytes,
1502 (u8 *)&data_crc);
1503
1504 if (checksum != data_crc) {
1505 pr_err("Ping data CRC32C DataDigest"
1506 " 0x%08x does not match computed 0x%08x\n",
1507 checksum, data_crc);
1508 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1509 pr_err("Unable to recover from"
1510 " NOPOUT Ping DataCRC failure while in"
1511 " ERL=0.\n");
1512 ret = -1;
1513 goto out;
1514 } else {
1515 /*
1516 * Silently drop this PDU and let the
1517 * initiator plug the CmdSN gap.
1518 */
1519 pr_debug("Dropping NOPOUT"
1520 " Command CmdSN: 0x%08x due to"
1521 " DataCRC error.\n", hdr->cmdsn);
1522 ret = 0;
1523 goto out;
1524 }
1525 } else {
1526 pr_debug("Got CRC32C DataDigest"
1527 " 0x%08x for %u bytes of ping data.\n",
1528 checksum, payload_length);
1529 }
1530 }
1531
1532 ping_data[payload_length] = '\0';
1533 /*
1534 * Attach ping data to struct iscsi_cmd->buf_ptr.
1535 */
8359cf43 1536 cmd->buf_ptr = ping_data;
e48354ce
NB		 1537 cmd->buf_ptr_size = payload_length;
1538
1539 pr_debug("Got %u bytes of NOPOUT ping"
1540 " data.\n", payload_length);
1541 pr_debug("Ping Data: \"%s\"\n", ping_data);
1542 }
1543
66c7db68 1544 if (hdr->itt != RESERVED_ITT) {
e48354ce
NB		 1545 if (!cmd) {
1546 pr_err("Checking CmdSN for NOPOUT,"
1547 " but cmd is NULL!\n");
1548 return -1;
1549 }
1550 /*
1551 * Initiator is expecting a NopIN ping reply,
1552 */
1553 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1554 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1555 spin_unlock_bh(&conn->cmd_lock);
1556
50e5c87d 1557 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1558
1559 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1560 iscsit_add_cmd_to_response_queue(cmd, conn,
1561 cmd->i_state);
1562 return 0;
1563 }
1564
1565 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1566 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1567 ret = 0;
1568 goto ping_out;
1569 }
1570 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1571 return iscsit_add_reject_from_cmd(
1572 ISCSI_REASON_PROTOCOL_ERROR,
1573 1, 0, buf, cmd);
1574
1575 return 0;
1576 }
1577
50e5c87d 1578 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1579 /*
1580 * This was a response to a unsolicited NOPIN ping.
1581 */
50e5c87d 1582 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
e48354ce
NB		 1583 if (!cmd)
1584 return -1;
1585
1586 iscsit_stop_nopin_response_timer(conn);
1587
1588 cmd->i_state = ISTATE_REMOVE;
1589 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1590 iscsit_start_nopin_timer(conn);
1591 } else {
1592 /*
1593 * Initiator is not expecting a NOPIN is response.
1594 * Just ignore for now.
1595 *
1596 * iSCSI v19-91 10.18
1597 * "A NOP-OUT may also be used to confirm a changed
1598 * ExpStatSN if another PDU will not be available
1599 * for a long time."
1600 */
1601 ret = 0;
1602 goto out;
1603 }
1604
1605 return 0;
1606out:
1607 if (cmd)
1608 iscsit_release_cmd(cmd);
1609ping_out:
1610 kfree(ping_data);
1611 return ret;
1612}
1613
1614static int iscsit_handle_task_mgt_cmd(
1615 struct iscsi_conn *conn,
1616 unsigned char *buf)
1617{
1618 struct iscsi_cmd *cmd;
1619 struct se_tmr_req *se_tmr;
1620 struct iscsi_tmr_req *tmr_req;
1621 struct iscsi_tm *hdr;
e48354ce
NB		 1622 int out_of_order_cmdsn = 0;
1623 int ret;
1624 u8 function;
1625
1626 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1627 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1628 function = hdr->flags;
1629
1630 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1631 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1632 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1633 hdr->rtt, hdr->refcmdsn, conn->cid);
1634
1635 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1636 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1637 hdr->rtt != RESERVED_ITT)) {
e48354ce 1638 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1639 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1640 }
1641
1642 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1643 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1644 pr_err("Task Management Request TASK_REASSIGN not"
1645 " issued as immediate command, bad iSCSI Initiator"
1646 "implementation\n");
1647 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1648 buf, conn);
1649 }
1650 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1651 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1652 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1653
d28b1169 1654 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
e48354ce
NB		 1655 if (!cmd)
1656 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
d28b1169
AG		 1657 1, buf, conn);
1658
1659 cmd->data_direction = DMA_NONE;
1660
1661 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1662 if (!cmd->tmr_req) {
1663 pr_err("Unable to allocate memory for"
1664 " Task Management command!\n");
1665 return iscsit_add_reject_from_cmd(
1666 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1667 1, 1, buf, cmd);
1668 }
1669
1670 /*
1671 * TASK_REASSIGN for ERL=2 / connection stays inside of
1672 * LIO-Target $FABRIC_MOD
1673 */
1674 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1675
1676 u8 tcm_function;
1677 int ret;
1678
1679 transport_init_se_cmd(&cmd->se_cmd,
1680 &lio_target_fabric_configfs->tf_ops,
1681 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1682 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169
AG		 1683
1684 switch (function) {
1685 case ISCSI_TM_FUNC_ABORT_TASK:
1686 tcm_function = TMR_ABORT_TASK;
1687 break;
1688 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1689 tcm_function = TMR_ABORT_TASK_SET;
1690 break;
1691 case ISCSI_TM_FUNC_CLEAR_ACA:
1692 tcm_function = TMR_CLEAR_ACA;
1693 break;
1694 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1695 tcm_function = TMR_CLEAR_TASK_SET;
1696 break;
1697 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1698 tcm_function = TMR_LUN_RESET;
1699 break;
1700 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1701 tcm_function = TMR_TARGET_WARM_RESET;
1702 break;
1703 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1704 tcm_function = TMR_TARGET_COLD_RESET;
1705 break;
1706 default:
1707 pr_err("Unknown iSCSI TMR Function:"
1708 " 0x%02x\n", function);
1709 return iscsit_add_reject_from_cmd(
1710 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1711 1, 1, buf, cmd);
1712 }
1713
1714 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1715 tcm_function, GFP_KERNEL);
1716 if (ret < 0)
1717 return iscsit_add_reject_from_cmd(
1718 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1719 1, 1, buf, cmd);
1720
1721 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1722 }
e48354ce
NB		 1723
1724 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1725 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1726 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1727 cmd->init_task_tag = hdr->itt;
1728 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1729 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1730 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1731 se_tmr = cmd->se_cmd.se_tmr_req;
1732 tmr_req = cmd->tmr_req;
1733 /*
1734 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1735 */
1736 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1737 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1738 scsilun_to_int(&hdr->lun));
e48354ce 1739 if (ret < 0) {
e48354ce
NB		 1740 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1741 goto attach;
1742 }
1743 }
1744
1745 switch (function) {
1746 case ISCSI_TM_FUNC_ABORT_TASK:
1747 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1748 if (se_tmr->response)
e48354ce 1749 goto attach;
e48354ce
NB		 1750 break;
1751 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1752 case ISCSI_TM_FUNC_CLEAR_ACA:
1753 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1754 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1755 break;
1756 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1757 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1758 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1759 goto attach;
1760 }
1761 break;
1762 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1763 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1764 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1765 goto attach;
1766 }
1767 break;
1768 case ISCSI_TM_FUNC_TASK_REASSIGN:
1769 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1770 /*
1771 * Perform sanity checks on the ExpDataSN only if the
1772 * TASK_REASSIGN was successful.
1773 */
de103c93 1774 if (se_tmr->response)
e48354ce
NB		 1775 break;
1776
1777 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1778 return iscsit_add_reject_from_cmd(
1779 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1780 buf, cmd);
1781 break;
1782 default:
1783 pr_err("Unknown TMR function: 0x%02x, protocol"
1784 " error.\n", function);
e48354ce
NB		 1785 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1786 goto attach;
1787 }
1788
1789 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1790 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1791 se_tmr->call_transport = 1;
1792attach:
1793 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1794 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1795 spin_unlock_bh(&conn->cmd_lock);
1796
1797 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1798 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1799 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1800 out_of_order_cmdsn = 1;
5a4c8666 1801 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1802 return 0;
5a4c8666 1803 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
e48354ce
NB		 1804 return iscsit_add_reject_from_cmd(
1805 ISCSI_REASON_PROTOCOL_ERROR,
1806 1, 0, buf, cmd);
e48354ce 1807 }
50e5c87d 1808 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1809
5a4c8666 1810 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1811 return 0;
1812 /*
1813 * Found the referenced task, send to transport for processing.
1814 */
1815 if (se_tmr->call_transport)
1816 return transport_generic_handle_tmr(&cmd->se_cmd);
1817
1818 /*
1819 * Could not find the referenced LUN, task, or Task Management
1820 * command not authorized or supported. Change state and
1821 * let the tx_thread send the response.
1822 *
1823 * For connection recovery, this is also the default action for
1824 * TMR TASK_REASSIGN.
1825 */
1826 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1827 return 0;
1828}
1829
1830/* #warning FIXME: Support Text Command parameters besides SendTargets */
1831static int iscsit_handle_text_cmd(
1832 struct iscsi_conn *conn,
1833 unsigned char *buf)
1834{
1835 char *text_ptr, *text_in;
1836 int cmdsn_ret, niov = 0, rx_got, rx_size;
1837 u32 checksum = 0, data_crc = 0, payload_length;
76f1928e 1838 u32 padding = 0, pad_bytes = 0, text_length = 0;
e48354ce
NB		 1839 struct iscsi_cmd *cmd;
1840 struct kvec iov[3];
1841 struct iscsi_text *hdr;
1842
1843 hdr = (struct iscsi_text *) buf;
1844 payload_length = ntoh24(hdr->dlength);
e48354ce 1845
21f5aa7e 1846 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1847 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1848 "greater than MaxXmitDataSegmentLength %u.\n",
1849 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 1850 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1851 buf, conn);
1852 }
1853
1854 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1855 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1856 hdr->exp_statsn, payload_length);
1857
1858 rx_size = text_length = payload_length;
1859 if (text_length) {
1860 text_in = kzalloc(text_length, GFP_KERNEL);
1861 if (!text_in) {
1862 pr_err("Unable to allocate memory for"
1863 " incoming text parameters\n");
1864 return -1;
1865 }
1866
1867 memset(iov, 0, 3 * sizeof(struct kvec));
1868 iov[niov].iov_base = text_in;
1869 iov[niov++].iov_len = text_length;
1870
1871 padding = ((-payload_length) & 3);
1872 if (padding != 0) {
76f1928e 1873 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 1874 iov[niov++].iov_len = padding;
1875 rx_size += padding;
1876 pr_debug("Receiving %u additional bytes"
1877 " for padding.\n", padding);
1878 }
1879 if (conn->conn_ops->DataDigest) {
1880 iov[niov].iov_base = &checksum;
1881 iov[niov++].iov_len = ISCSI_CRC_LEN;
1882 rx_size += ISCSI_CRC_LEN;
1883 }
1884
1885 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1886 if (rx_got != rx_size) {
1887 kfree(text_in);
1888 return -1;
1889 }
1890
1891 if (conn->conn_ops->DataDigest) {
1892 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1893 text_in, text_length,
76f1928e 1894 padding, (u8 *)&pad_bytes,
e48354ce
NB		 1895 (u8 *)&data_crc);
1896
1897 if (checksum != data_crc) {
1898 pr_err("Text data CRC32C DataDigest"
1899 " 0x%08x does not match computed"
1900 " 0x%08x\n", checksum, data_crc);
1901 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1902 pr_err("Unable to recover from"
1903 " Text Data digest failure while in"
1904 " ERL=0.\n");
1905 kfree(text_in);
1906 return -1;
1907 } else {
1908 /*
1909 * Silently drop this PDU and let the
1910 * initiator plug the CmdSN gap.
1911 */
1912 pr_debug("Dropping Text"
1913 " Command CmdSN: 0x%08x due to"
1914 " DataCRC error.\n", hdr->cmdsn);
1915 kfree(text_in);
1916 return 0;
1917 }
1918 } else {
1919 pr_debug("Got CRC32C DataDigest"
1920 " 0x%08x for %u bytes of text data.\n",
1921 checksum, text_length);
1922 }
1923 }
1924 text_in[text_length - 1] = '\0';
1925 pr_debug("Successfully read %d bytes of text"
1926 " data.\n", text_length);
1927
1928 if (strncmp("SendTargets", text_in, 11) != 0) {
1929 pr_err("Received Text Data that is not"
1930 " SendTargets, cannot continue.\n");
1931 kfree(text_in);
1932 return -1;
1933 }
1934 text_ptr = strchr(text_in, '=');
1935 if (!text_ptr) {
1936 pr_err("No \"=\" separator found in Text Data,"
1937 " cannot continue.\n");
1938 kfree(text_in);
1939 return -1;
1940 }
1941 if (strncmp("=All", text_ptr, 4) != 0) {
1942 pr_err("Unable to locate All value for"
1943 " SendTargets key, cannot continue.\n");
1944 kfree(text_in);
1945 return -1;
1946 }
1947/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1948 kfree(text_in);
1949 }
1950
1951 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1952 if (!cmd)
1953 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1954 1, buf, conn);
1955
1956 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1957 cmd->i_state = ISTATE_SEND_TEXTRSP;
1958 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1959 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1960 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1961 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1962 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1963 cmd->data_direction = DMA_NONE;
1964
1965 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1966 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1967 spin_unlock_bh(&conn->cmd_lock);
1968
50e5c87d 1969 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1970
1971 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1972 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1973 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1974 return iscsit_add_reject_from_cmd(
1975 ISCSI_REASON_PROTOCOL_ERROR,
1976 1, 0, buf, cmd);
1977
1978 return 0;
1979 }
1980
1981 return iscsit_execute_cmd(cmd, 0);
1982}
1983
1984int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1985{
1986 struct iscsi_conn *conn_p;
1987 struct iscsi_session *sess = conn->sess;
1988
1989 pr_debug("Received logout request CLOSESESSION on CID: %hu"
1990 " for SID: %u.\n", conn->cid, conn->sess->sid);
1991
1992 atomic_set(&sess->session_logout, 1);
1993 atomic_set(&conn->conn_logout_remove, 1);
1994 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
1995
1996 iscsit_inc_conn_usage_count(conn);
1997 iscsit_inc_session_usage_count(sess);
1998
1999 spin_lock_bh(&sess->conn_lock);
2000 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2001 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2002 continue;
2003
2004 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2005 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2006 }
2007 spin_unlock_bh(&sess->conn_lock);
2008
2009 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2010
2011 return 0;
2012}
2013
2014int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2015{
2016 struct iscsi_conn *l_conn;
2017 struct iscsi_session *sess = conn->sess;
2018
2019 pr_debug("Received logout request CLOSECONNECTION for CID:"
2020 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2021
2022 /*
2023 * A Logout Request with a CLOSECONNECTION reason code for a CID
2024 * can arrive on a connection with a differing CID.
2025 */
2026 if (conn->cid == cmd->logout_cid) {
2027 spin_lock_bh(&conn->state_lock);
2028 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2029 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2030
2031 atomic_set(&conn->conn_logout_remove, 1);
2032 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2033 iscsit_inc_conn_usage_count(conn);
2034
2035 spin_unlock_bh(&conn->state_lock);
2036 } else {
2037 /*
2038 * Handle all different cid CLOSECONNECTION requests in
2039 * iscsit_logout_post_handler_diffcid() as to give enough
2040 * time for any non immediate command's CmdSN to be
2041 * acknowledged on the connection in question.
2042 *
2043 * Here we simply make sure the CID is still around.
2044 */
2045 l_conn = iscsit_get_conn_from_cid(sess,
2046 cmd->logout_cid);
2047 if (!l_conn) {
2048 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2049 iscsit_add_cmd_to_response_queue(cmd, conn,
2050 cmd->i_state);
2051 return 0;
2052 }
2053
2054 iscsit_dec_conn_usage_count(l_conn);
2055 }
2056
2057 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2058
2059 return 0;
2060}
2061
2062int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2063{
2064 struct iscsi_session *sess = conn->sess;
2065
2066 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2067 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2068
2069 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2070 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2071 " while ERL!=2.\n");
2072 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2073 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2074 return 0;
2075 }
2076
2077 if (conn->cid == cmd->logout_cid) {
2078 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2079 " with CID: %hu on CID: %hu, implementation error.\n",
2080 cmd->logout_cid, conn->cid);
2081 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2082 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2083 return 0;
2084 }
2085
2086 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2087
2088 return 0;
2089}
2090
2091static int iscsit_handle_logout_cmd(
2092 struct iscsi_conn *conn,
2093 unsigned char *buf)
2094{
2095 int cmdsn_ret, logout_remove = 0;
2096 u8 reason_code = 0;
2097 struct iscsi_cmd *cmd;
2098 struct iscsi_logout *hdr;
2099 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2100
2101 hdr = (struct iscsi_logout *) buf;
2102 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2103
2104 if (tiqn) {
2105 spin_lock(&tiqn->logout_stats.lock);
2106 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2107 tiqn->logout_stats.normal_logouts++;
2108 else
2109 tiqn->logout_stats.abnormal_logouts++;
2110 spin_unlock(&tiqn->logout_stats.lock);
2111 }
2112
2113 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2114 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2115 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2116 hdr->cid, conn->cid);
2117
2118 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2119 pr_err("Received logout request on connection that"
2120 " is not in logged in state, ignoring request.\n");
2121 return 0;
2122 }
2123
2124 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2125 if (!cmd)
2126 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2127 buf, conn);
2128
2129 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2130 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2131 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2132 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2133 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2134 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2135 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2136 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2137 cmd->logout_reason = reason_code;
2138 cmd->data_direction = DMA_NONE;
2139
2140 /*
2141 * We need to sleep in these cases (by returning 1) until the Logout
2142 * Response gets sent in the tx thread.
2143 */
2144 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2145 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2146 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2147 logout_remove = 1;
2148
2149 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2150 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2151 spin_unlock_bh(&conn->cmd_lock);
2152
2153 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2154 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2155
2156 /*
2157 * Immediate commands are executed, well, immediately.
2158 * Non-Immediate Logout Commands are executed in CmdSN order.
2159 */
c6037cc5 2160 if (cmd->immediate_cmd) {
e48354ce
NB		 2161 int ret = iscsit_execute_cmd(cmd, 0);
2162
2163 if (ret < 0)
2164 return ret;
2165 } else {
2166 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2167 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2168 logout_remove = 0;
2169 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2170 return iscsit_add_reject_from_cmd(
2171 ISCSI_REASON_PROTOCOL_ERROR,
2172 1, 0, buf, cmd);
2173 }
2174 }
2175
2176 return logout_remove;
2177}
2178
2179static int iscsit_handle_snack(
2180 struct iscsi_conn *conn,
2181 unsigned char *buf)
2182{
e48354ce
NB		 2183 struct iscsi_snack *hdr;
2184
2185 hdr = (struct iscsi_snack *) buf;
2186 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2187
2188 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2189 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2190 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2191 hdr->begrun, hdr->runlength, conn->cid);
2192
2193 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2194 pr_err("Initiator sent SNACK request while in"
2195 " ErrorRecoveryLevel=0.\n");
2196 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2197 buf, conn);
2198 }
2199 /*
2200 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2201 * call from inside iscsi_send_recovery_datain_or_r2t().
2202 */
2203 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2204 case 0:
2205 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2206 hdr->itt,
2207 be32_to_cpu(hdr->ttt),
2208 be32_to_cpu(hdr->begrun),
2209 be32_to_cpu(hdr->runlength));
e48354ce 2210 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2211 return iscsit_handle_status_snack(conn, hdr->itt,
2212 be32_to_cpu(hdr->ttt),
2213 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2214 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2215 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2216 be32_to_cpu(hdr->begrun),
2217 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2218 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2219 /* FIXME: Support R-Data SNACK */
2220 pr_err("R-Data SNACK Not Supported.\n");
2221 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2222 buf, conn);
2223 default:
2224 pr_err("Unknown SNACK type 0x%02x, protocol"
2225 " error.\n", hdr->flags & 0x0f);
2226 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2227 buf, conn);
2228 }
2229
2230 return 0;
2231}
2232
2233static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2234{
2235 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2236 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2237 wait_for_completion_interruptible_timeout(
2238 &conn->rx_half_close_comp,
2239 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2240 }
2241}
2242
2243static int iscsit_handle_immediate_data(
2244 struct iscsi_cmd *cmd,
2245 unsigned char *buf,
2246 u32 length)
2247{
2248 int iov_ret, rx_got = 0, rx_size = 0;
2249 u32 checksum, iov_count = 0, padding = 0;
2250 struct iscsi_conn *conn = cmd->conn;
2251 struct kvec *iov;
2252
2253 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2254 if (iov_ret < 0)
2255 return IMMEDIATE_DATA_CANNOT_RECOVER;
2256
2257 rx_size = length;
2258 iov_count = iov_ret;
2259 iov = &cmd->iov_data[0];
2260
2261 padding = ((-length) & 3);
2262 if (padding != 0) {
2263 iov[iov_count].iov_base = cmd->pad_bytes;
2264 iov[iov_count++].iov_len = padding;
2265 rx_size += padding;
2266 }
2267
2268 if (conn->conn_ops->DataDigest) {
2269 iov[iov_count].iov_base = &checksum;
2270 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2271 rx_size += ISCSI_CRC_LEN;
2272 }
2273
2274 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2275
2276 iscsit_unmap_iovec(cmd);
2277
2278 if (rx_got != rx_size) {
2279 iscsit_rx_thread_wait_for_tcp(conn);
2280 return IMMEDIATE_DATA_CANNOT_RECOVER;
2281 }
2282
2283 if (conn->conn_ops->DataDigest) {
2284 u32 data_crc;
2285
2286 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2287 cmd->write_data_done, length, padding,
2288 cmd->pad_bytes);
2289
2290 if (checksum != data_crc) {
2291 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2292 " does not match computed 0x%08x\n", checksum,
2293 data_crc);
2294
2295 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2296 pr_err("Unable to recover from"
2297 " Immediate Data digest failure while"
2298 " in ERL=0.\n");
2299 iscsit_add_reject_from_cmd(
2300 ISCSI_REASON_DATA_DIGEST_ERROR,
2301 1, 0, buf, cmd);
2302 return IMMEDIATE_DATA_CANNOT_RECOVER;
2303 } else {
2304 iscsit_add_reject_from_cmd(
2305 ISCSI_REASON_DATA_DIGEST_ERROR,
2306 0, 0, buf, cmd);
2307 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2308 }
2309 } else {
2310 pr_debug("Got CRC32C DataDigest 0x%08x for"
2311 " %u bytes of Immediate Data\n", checksum,
2312 length);
2313 }
2314 }
2315
2316 cmd->write_data_done += length;
2317
ebf1d95c 2318 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2319 spin_lock_bh(&cmd->istate_lock);
2320 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2321 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2322 spin_unlock_bh(&cmd->istate_lock);
2323 }
2324
2325 return IMMEDIATE_DATA_NORMAL_OPERATION;
2326}
2327
2328/*
2329 * Called with sess->conn_lock held.
2330 */
2331/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2332 with active network interface */
2333static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2334{
2335 struct iscsi_cmd *cmd;
2336 struct iscsi_conn *conn_p;
2337
2338 /*
2339 * Only send a Asynchronous Message on connections whos network
2340 * interface is still functional.
2341 */
2342 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2343 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2344 iscsit_inc_conn_usage_count(conn_p);
2345 break;
2346 }
2347 }
2348
2349 if (!conn_p)
2350 return;
2351
3c989d76 2352 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2353 if (!cmd) {
2354 iscsit_dec_conn_usage_count(conn_p);
2355 return;
2356 }
2357
2358 cmd->logout_cid = conn->cid;
2359 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2360 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2361
2362 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2363 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2364 spin_unlock_bh(&conn_p->cmd_lock);
2365
2366 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2367 iscsit_dec_conn_usage_count(conn_p);
2368}
2369
2370static int iscsit_send_conn_drop_async_message(
2371 struct iscsi_cmd *cmd,
2372 struct iscsi_conn *conn)
2373{
2374 struct iscsi_async *hdr;
2375
2376 cmd->tx_size = ISCSI_HDR_LEN;
2377 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2378
2379 hdr = (struct iscsi_async *) cmd->pdu;
2380 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2381 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2382 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2383 cmd->targ_xfer_tag = 0xFFFFFFFF;
2384 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2385 cmd->stat_sn = conn->stat_sn++;
2386 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2387 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2388 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2389 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2390 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2391 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2392 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2393
2394 if (conn->conn_ops->HeaderDigest) {
2395 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2396
2397 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2398 (unsigned char *)hdr, ISCSI_HDR_LEN,
2399 0, NULL, (u8 *)header_digest);
2400
2401 cmd->tx_size += ISCSI_CRC_LEN;
2402 pr_debug("Attaching CRC32C HeaderDigest to"
2403 " Async Message 0x%08x\n", *header_digest);
2404 }
2405
2406 cmd->iov_misc[0].iov_base = cmd->pdu;
2407 cmd->iov_misc[0].iov_len = cmd->tx_size;
2408 cmd->iov_misc_count = 1;
2409
2410 pr_debug("Sending Connection Dropped Async Message StatSN:"
2411 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2412 cmd->logout_cid, conn->cid);
2413 return 0;
2414}
2415
6f3c0e69
AG		 2416static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2417{
2418 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2419 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2420 wait_for_completion_interruptible_timeout(
2421 &conn->tx_half_close_comp,
2422 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2423 }
2424}
2425
e48354ce
NB		 2426static int iscsit_send_data_in(
2427 struct iscsi_cmd *cmd,
6f3c0e69 2428 struct iscsi_conn *conn)
e48354ce
NB		 2429{
2430 int iov_ret = 0, set_statsn = 0;
2431 u32 iov_count = 0, tx_size = 0;
2432 struct iscsi_datain datain;
2433 struct iscsi_datain_req *dr;
2434 struct iscsi_data_rsp *hdr;
2435 struct kvec *iov;
6f3c0e69
AG		 2436 int eodr = 0;
2437 int ret;
e48354ce
NB		 2438
2439 memset(&datain, 0, sizeof(struct iscsi_datain));
2440 dr = iscsit_get_datain_values(cmd, &datain);
2441 if (!dr) {
2442 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2443 cmd->init_task_tag);
2444 return -1;
2445 }
2446
2447 /*
2448 * Be paranoid and double check the logic for now.
2449 */
ebf1d95c 2450 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2451 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2452 " datain.length: %u exceeds cmd->data_length: %u\n",
2453 cmd->init_task_tag, datain.offset, datain.length,
ebf1d95c 2454 cmd->se_cmd.data_length);
e48354ce
NB		 2455 return -1;
2456 }
2457
2458 spin_lock_bh(&conn->sess->session_stats_lock);
2459 conn->sess->tx_data_octets += datain.length;
2460 if (conn->sess->se_sess->se_node_acl) {
2461 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2462 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2463 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2464 }
2465 spin_unlock_bh(&conn->sess->session_stats_lock);
2466 /*
2467 * Special case for successfully execution w/ both DATAIN
2468 * and Sense Data.
2469 */
2470 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2471 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2472 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2473 else {
2474 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2475 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2476 iscsit_increment_maxcmdsn(cmd, conn->sess);
2477 cmd->stat_sn = conn->stat_sn++;
2478 set_statsn = 1;
2479 } else if (dr->dr_complete ==
2480 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2481 set_statsn = 1;
2482 }
2483
2484 hdr = (struct iscsi_data_rsp *) cmd->pdu;
2485 memset(hdr, 0, ISCSI_HDR_LEN);
2486 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2487 hdr->flags = datain.flags;
2488 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2489 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2490 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
7e46cf02 2491 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 2492 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2493 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
7e46cf02 2494 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 2495 }
2496 }
2497 hton24(hdr->dlength, datain.length);
2498 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2499 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2500 (struct scsi_lun *)&hdr->lun);
2501 else
2502 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2503
66c7db68 2504 hdr->itt = cmd->init_task_tag;
50e5c87d
CH		 2505
2506 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2507 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2508 else
2509 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2510 if (set_statsn)
2511 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2512 else
2513 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2514
e48354ce
NB		 2515 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2516 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2517 hdr->datasn = cpu_to_be32(datain.data_sn);
2518 hdr->offset = cpu_to_be32(datain.offset);
2519
2520 iov = &cmd->iov_data[0];
2521 iov[iov_count].iov_base = cmd->pdu;
2522 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2523 tx_size += ISCSI_HDR_LEN;
2524
2525 if (conn->conn_ops->HeaderDigest) {
2526 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2527
2528 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2529 (unsigned char *)hdr, ISCSI_HDR_LEN,
2530 0, NULL, (u8 *)header_digest);
2531
2532 iov[0].iov_len += ISCSI_CRC_LEN;
2533 tx_size += ISCSI_CRC_LEN;
2534
2535 pr_debug("Attaching CRC32 HeaderDigest"
2536 " for DataIN PDU 0x%08x\n", *header_digest);
2537 }
2538
2539 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2540 if (iov_ret < 0)
2541 return -1;
2542
2543 iov_count += iov_ret;
2544 tx_size += datain.length;
2545
2546 cmd->padding = ((-datain.length) & 3);
2547 if (cmd->padding) {
2548 iov[iov_count].iov_base = cmd->pad_bytes;
2549 iov[iov_count++].iov_len = cmd->padding;
2550 tx_size += cmd->padding;
2551
2552 pr_debug("Attaching %u padding bytes\n",
2553 cmd->padding);
2554 }
2555 if (conn->conn_ops->DataDigest) {
2556 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2557 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2558
2559 iov[iov_count].iov_base = &cmd->data_crc;
2560 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2561 tx_size += ISCSI_CRC_LEN;
2562
2563 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2564 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2565 }
2566
2567 cmd->iov_data_count = iov_count;
2568 cmd->tx_size = tx_size;
2569
2570 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2571 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2572 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2573 ntohl(hdr->offset), datain.length, conn->cid);
2574
6f3c0e69
AG		 2575 /* sendpage is preferred but can't insert markers */
2576 if (!conn->conn_ops->IFMarker)
2577 ret = iscsit_fe_sendpage_sg(cmd, conn);
2578 else
2579 ret = iscsit_send_tx_data(cmd, conn, 0);
2580
2581 iscsit_unmap_iovec(cmd);
2582
2583 if (ret < 0) {
2584 iscsit_tx_thread_wait_for_tcp(conn);
2585 return ret;
2586 }
2587
e48354ce 2588 if (dr->dr_complete) {
6f3c0e69 2589 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2590 2 : 1;
2591 iscsit_free_datain_req(cmd, dr);
2592 }
2593
6f3c0e69 2594 return eodr;
e48354ce
NB		 2595}
2596
2597static int iscsit_send_logout_response(
2598 struct iscsi_cmd *cmd,
2599 struct iscsi_conn *conn)
2600{
2601 int niov = 0, tx_size;
2602 struct iscsi_conn *logout_conn = NULL;
2603 struct iscsi_conn_recovery *cr = NULL;
2604 struct iscsi_session *sess = conn->sess;
2605 struct kvec *iov;
2606 struct iscsi_logout_rsp *hdr;
2607 /*
2608 * The actual shutting down of Sessions and/or Connections
2609 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2610 * is done in scsi_logout_post_handler().
2611 */
2612 switch (cmd->logout_reason) {
2613 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2614 pr_debug("iSCSI session logout successful, setting"
2615 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2616 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2617 break;
2618 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2619 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2620 break;
2621 /*
2622 * For CLOSECONNECTION logout requests carrying
2623 * a matching logout CID -> local CID, the reference
2624 * for the local CID will have been incremented in
2625 * iscsi_logout_closeconnection().
2626 *
2627 * For CLOSECONNECTION logout requests carrying
2628 * a different CID than the connection it arrived
2629 * on, the connection responding to cmd->logout_cid
2630 * is stopped in iscsit_logout_post_handler_diffcid().
2631 */
2632
2633 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2634 " successful.\n", cmd->logout_cid, conn->cid);
2635 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2636 break;
2637 case ISCSI_LOGOUT_REASON_RECOVERY:
2638 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2639 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2640 break;
2641 /*
2642 * If the connection is still active from our point of view
2643 * force connection recovery to occur.
2644 */
2645 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2646 cmd->logout_cid);
ee1b1b9c 2647 if (logout_conn) {
e48354ce
NB		 2648 iscsit_connection_reinstatement_rcfr(logout_conn);
2649 iscsit_dec_conn_usage_count(logout_conn);
2650 }
2651
2652 cr = iscsit_get_inactive_connection_recovery_entry(
2653 conn->sess, cmd->logout_cid);
2654 if (!cr) {
2655 pr_err("Unable to locate CID: %hu for"
2656 " REMOVECONNFORRECOVERY Logout Request.\n",
2657 cmd->logout_cid);
2658 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2659 break;
2660 }
2661
2662 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2663
2664 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2665 " for recovery for CID: %hu on CID: %hu successful.\n",
2666 cmd->logout_cid, conn->cid);
2667 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2668 break;
2669 default:
2670 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2671 cmd->logout_reason);
2672 return -1;
2673 }
2674
2675 tx_size = ISCSI_HDR_LEN;
2676 hdr = (struct iscsi_logout_rsp *)cmd->pdu;
2677 memset(hdr, 0, ISCSI_HDR_LEN);
2678 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2679 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2680 hdr->response = cmd->logout_response;
66c7db68 2681 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2682 cmd->stat_sn = conn->stat_sn++;
2683 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2684
2685 iscsit_increment_maxcmdsn(cmd, conn->sess);
2686 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2687 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2688
2689 iov = &cmd->iov_misc[0];
2690 iov[niov].iov_base = cmd->pdu;
2691 iov[niov++].iov_len = ISCSI_HDR_LEN;
2692
2693 if (conn->conn_ops->HeaderDigest) {
2694 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2695
2696 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2697 (unsigned char *)hdr, ISCSI_HDR_LEN,
2698 0, NULL, (u8 *)header_digest);
2699
2700 iov[0].iov_len += ISCSI_CRC_LEN;
2701 tx_size += ISCSI_CRC_LEN;
2702 pr_debug("Attaching CRC32C HeaderDigest to"
2703 " Logout Response 0x%08x\n", *header_digest);
2704 }
2705 cmd->iov_misc_count = niov;
2706 cmd->tx_size = tx_size;
2707
2708 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2709 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2710 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2711 cmd->logout_cid, conn->cid);
2712
2713 return 0;
2714}
2715
2716/*
2717 * Unsolicited NOPIN, either requesting a response or not.
2718 */
2719static int iscsit_send_unsolicited_nopin(
2720 struct iscsi_cmd *cmd,
2721 struct iscsi_conn *conn,
2722 int want_response)
2723{
2724 int tx_size = ISCSI_HDR_LEN;
2725 struct iscsi_nopin *hdr;
6f3c0e69 2726 int ret;
e48354ce
NB		 2727
2728 hdr = (struct iscsi_nopin *) cmd->pdu;
2729 memset(hdr, 0, ISCSI_HDR_LEN);
2730 hdr->opcode = ISCSI_OP_NOOP_IN;
2731 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
66c7db68 2732 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2733 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2734 cmd->stat_sn = conn->stat_sn;
2735 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2736 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2737 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2738
2739 if (conn->conn_ops->HeaderDigest) {
2740 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2741
2742 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2743 (unsigned char *)hdr, ISCSI_HDR_LEN,
2744 0, NULL, (u8 *)header_digest);
2745
2746 tx_size += ISCSI_CRC_LEN;
2747 pr_debug("Attaching CRC32C HeaderDigest to"
2748 " NopIN 0x%08x\n", *header_digest);
2749 }
2750
2751 cmd->iov_misc[0].iov_base = cmd->pdu;
2752 cmd->iov_misc[0].iov_len = tx_size;
2753 cmd->iov_misc_count = 1;
2754 cmd->tx_size = tx_size;
2755
2756 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2757 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2758
6f3c0e69
AG		 2759 ret = iscsit_send_tx_data(cmd, conn, 1);
2760 if (ret < 0) {
2761 iscsit_tx_thread_wait_for_tcp(conn);
2762 return ret;
2763 }
2764
2765 spin_lock_bh(&cmd->istate_lock);
2766 cmd->i_state = want_response ?
2767 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2768 spin_unlock_bh(&cmd->istate_lock);
2769
e48354ce
NB		 2770 return 0;
2771}
2772
2773static int iscsit_send_nopin_response(
2774 struct iscsi_cmd *cmd,
2775 struct iscsi_conn *conn)
2776{
2777 int niov = 0, tx_size;
2778 u32 padding = 0;
2779 struct kvec *iov;
2780 struct iscsi_nopin *hdr;
2781
2782 tx_size = ISCSI_HDR_LEN;
2783 hdr = (struct iscsi_nopin *) cmd->pdu;
2784 memset(hdr, 0, ISCSI_HDR_LEN);
2785 hdr->opcode = ISCSI_OP_NOOP_IN;
2786 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2787 hton24(hdr->dlength, cmd->buf_ptr_size);
2788 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
66c7db68 2789 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2790 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2791 cmd->stat_sn = conn->stat_sn++;
2792 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2793
2794 iscsit_increment_maxcmdsn(cmd, conn->sess);
2795 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2796 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2797
2798 iov = &cmd->iov_misc[0];
2799 iov[niov].iov_base = cmd->pdu;
2800 iov[niov++].iov_len = ISCSI_HDR_LEN;
2801
2802 if (conn->conn_ops->HeaderDigest) {
2803 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2804
2805 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2806 (unsigned char *)hdr, ISCSI_HDR_LEN,
2807 0, NULL, (u8 *)header_digest);
2808
2809 iov[0].iov_len += ISCSI_CRC_LEN;
2810 tx_size += ISCSI_CRC_LEN;
2811 pr_debug("Attaching CRC32C HeaderDigest"
2812 " to NopIn 0x%08x\n", *header_digest);
2813 }
2814
2815 /*
2816 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2817 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2818 */
2819 if (cmd->buf_ptr_size) {
2820 iov[niov].iov_base = cmd->buf_ptr;
2821 iov[niov++].iov_len = cmd->buf_ptr_size;
2822 tx_size += cmd->buf_ptr_size;
2823
2824 pr_debug("Echoing back %u bytes of ping"
2825 " data.\n", cmd->buf_ptr_size);
2826
2827 padding = ((-cmd->buf_ptr_size) & 3);
2828 if (padding != 0) {
2829 iov[niov].iov_base = &cmd->pad_bytes;
2830 iov[niov++].iov_len = padding;
2831 tx_size += padding;
2832 pr_debug("Attaching %u additional"
2833 " padding bytes.\n", padding);
2834 }
2835 if (conn->conn_ops->DataDigest) {
2836 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2837 cmd->buf_ptr, cmd->buf_ptr_size,
2838 padding, (u8 *)&cmd->pad_bytes,
2839 (u8 *)&cmd->data_crc);
2840
2841 iov[niov].iov_base = &cmd->data_crc;
2842 iov[niov++].iov_len = ISCSI_CRC_LEN;
2843 tx_size += ISCSI_CRC_LEN;
2844 pr_debug("Attached DataDigest for %u"
2845 " bytes of ping data, CRC 0x%08x\n",
2846 cmd->buf_ptr_size, cmd->data_crc);
2847 }
2848 }
2849
2850 cmd->iov_misc_count = niov;
2851 cmd->tx_size = tx_size;
2852
2853 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2854 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2855 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2856
2857 return 0;
2858}
2859
6f3c0e69 2860static int iscsit_send_r2t(
e48354ce
NB		 2861 struct iscsi_cmd *cmd,
2862 struct iscsi_conn *conn)
2863{
2864 int tx_size = 0;
2865 struct iscsi_r2t *r2t;
2866 struct iscsi_r2t_rsp *hdr;
6f3c0e69 2867 int ret;
e48354ce
NB		 2868
2869 r2t = iscsit_get_r2t_from_list(cmd);
2870 if (!r2t)
2871 return -1;
2872
2873 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
2874 memset(hdr, 0, ISCSI_HDR_LEN);
2875 hdr->opcode = ISCSI_OP_R2T;
2876 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2877 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2878 (struct scsi_lun *)&hdr->lun);
66c7db68 2879 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2880 spin_lock_bh(&conn->sess->ttt_lock);
2881 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2882 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2883 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2884 spin_unlock_bh(&conn->sess->ttt_lock);
2885 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
2886 hdr->statsn = cpu_to_be32(conn->stat_sn);
2887 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2888 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2889 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
2890 hdr->data_offset = cpu_to_be32(r2t->offset);
2891 hdr->data_length = cpu_to_be32(r2t->xfer_len);
2892
2893 cmd->iov_misc[0].iov_base = cmd->pdu;
2894 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
2895 tx_size += ISCSI_HDR_LEN;
2896
2897 if (conn->conn_ops->HeaderDigest) {
2898 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2899
2900 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2901 (unsigned char *)hdr, ISCSI_HDR_LEN,
2902 0, NULL, (u8 *)header_digest);
2903
2904 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2905 tx_size += ISCSI_CRC_LEN;
2906 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2907 " PDU 0x%08x\n", *header_digest);
2908 }
2909
2910 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2911 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2912 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2913 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2914 r2t->offset, r2t->xfer_len, conn->cid);
2915
2916 cmd->iov_misc_count = 1;
2917 cmd->tx_size = tx_size;
2918
2919 spin_lock_bh(&cmd->r2t_lock);
2920 r2t->sent_r2t = 1;
2921 spin_unlock_bh(&cmd->r2t_lock);
2922
6f3c0e69
AG		 2923 ret = iscsit_send_tx_data(cmd, conn, 1);
2924 if (ret < 0) {
2925 iscsit_tx_thread_wait_for_tcp(conn);
2926 return ret;
2927 }
2928
2929 spin_lock_bh(&cmd->dataout_timeout_lock);
2930 iscsit_start_dataout_timer(cmd, conn);
2931 spin_unlock_bh(&cmd->dataout_timeout_lock);
2932
e48354ce
NB		 2933 return 0;
2934}
2935
2936/*
8b1e1244
AG		 2937 * @recovery: If called from iscsi_task_reassign_complete_write() for
2938 * connection recovery.
e48354ce
NB		 2939 */
2940int iscsit_build_r2ts_for_cmd(
2941 struct iscsi_cmd *cmd,
2942 struct iscsi_conn *conn,
8b1e1244 2943 bool recovery)
e48354ce
NB		 2944{
2945 int first_r2t = 1;
2946 u32 offset = 0, xfer_len = 0;
2947
2948 spin_lock_bh(&cmd->r2t_lock);
2949 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2950 spin_unlock_bh(&cmd->r2t_lock);
2951 return 0;
2952 }
2953
8b1e1244
AG		 2954 if (conn->sess->sess_ops->DataSequenceInOrder &&
2955 !recovery)
c6037cc5 2956 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 2957
2958 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2959 if (conn->sess->sess_ops->DataSequenceInOrder) {
2960 offset = cmd->r2t_offset;
2961
8b1e1244
AG		 2962 if (first_r2t && recovery) {
2963 int new_data_end = offset +
2964 conn->sess->sess_ops->MaxBurstLength -
2965 cmd->next_burst_len;
2966
ebf1d95c
AG		 2967 if (new_data_end > cmd->se_cmd.data_length)
2968 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 2969 else
2970 xfer_len =
2971 conn->sess->sess_ops->MaxBurstLength -
2972 cmd->next_burst_len;
e48354ce 2973 } else {
8b1e1244
AG		 2974 int new_data_end = offset +
2975 conn->sess->sess_ops->MaxBurstLength;
2976
ebf1d95c
AG		 2977 if (new_data_end > cmd->se_cmd.data_length)
2978 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 2979 else
2980 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 2981 }
2982 cmd->r2t_offset += xfer_len;
2983
ebf1d95c 2984 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 2985 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2986 } else {
2987 struct iscsi_seq *seq;
2988
2989 seq = iscsit_get_seq_holder_for_r2t(cmd);
2990 if (!seq) {
2991 spin_unlock_bh(&cmd->r2t_lock);
2992 return -1;
2993 }
2994
2995 offset = seq->offset;
2996 xfer_len = seq->xfer_len;
2997
2998 if (cmd->seq_send_order == cmd->seq_count)
2999 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3000 }
3001 cmd->outstanding_r2ts++;
3002 first_r2t = 0;
3003
3004 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3005 spin_unlock_bh(&cmd->r2t_lock);
3006 return -1;
3007 }
3008
3009 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3010 break;
3011 }
3012 spin_unlock_bh(&cmd->r2t_lock);
3013
3014 return 0;
3015}
3016
3017static int iscsit_send_status(
3018 struct iscsi_cmd *cmd,
3019 struct iscsi_conn *conn)
3020{
3021 u8 iov_count = 0, recovery;
3022 u32 padding = 0, tx_size = 0;
3023 struct iscsi_scsi_rsp *hdr;
3024 struct kvec *iov;
3025
3026 recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3027 if (!recovery)
3028 cmd->stat_sn = conn->stat_sn++;
3029
3030 spin_lock_bh(&conn->sess->session_stats_lock);
3031 conn->sess->rsp_pdus++;
3032 spin_unlock_bh(&conn->sess->session_stats_lock);
3033
3034 hdr = (struct iscsi_scsi_rsp *) cmd->pdu;
3035 memset(hdr, 0, ISCSI_HDR_LEN);
3036 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3037 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3038 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3039 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3040 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3041 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3042 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3043 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3044 }
3045 hdr->response = cmd->iscsi_response;
3046 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3047 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3048 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3049
3050 iscsit_increment_maxcmdsn(cmd, conn->sess);
3051 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3052 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3053
3054 iov = &cmd->iov_misc[0];
3055 iov[iov_count].iov_base = cmd->pdu;
3056 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3057 tx_size += ISCSI_HDR_LEN;
3058
3059 /*
3060 * Attach SENSE DATA payload to iSCSI Response PDU
3061 */
3062 if (cmd->se_cmd.sense_buffer &&
3063 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3064 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3065 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3066 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3067
e48354ce 3068 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3069 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3070 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3071 iov[iov_count++].iov_len =
3072 (cmd->se_cmd.scsi_sense_length + padding);
3073 tx_size += cmd->se_cmd.scsi_sense_length;
3074
3075 if (padding) {
9c58b7dd 3076 memset(cmd->sense_buffer +
e48354ce
NB		 3077 cmd->se_cmd.scsi_sense_length, 0, padding);
3078 tx_size += padding;
3079 pr_debug("Adding %u bytes of padding to"
3080 " SENSE.\n", padding);
3081 }
3082
3083 if (conn->conn_ops->DataDigest) {
3084 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3085 cmd->sense_buffer,
e48354ce
NB		 3086 (cmd->se_cmd.scsi_sense_length + padding),
3087 0, NULL, (u8 *)&cmd->data_crc);
3088
3089 iov[iov_count].iov_base = &cmd->data_crc;
3090 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3091 tx_size += ISCSI_CRC_LEN;
3092
3093 pr_debug("Attaching CRC32 DataDigest for"
3094 " SENSE, %u bytes CRC 0x%08x\n",
3095 (cmd->se_cmd.scsi_sense_length + padding),
3096 cmd->data_crc);
3097 }
3098
3099 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3100 " Response PDU\n",
3101 cmd->se_cmd.scsi_sense_length);
3102 }
3103
3104 if (conn->conn_ops->HeaderDigest) {
3105 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3106
3107 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3108 (unsigned char *)hdr, ISCSI_HDR_LEN,
3109 0, NULL, (u8 *)header_digest);
3110
3111 iov[0].iov_len += ISCSI_CRC_LEN;
3112 tx_size += ISCSI_CRC_LEN;
3113 pr_debug("Attaching CRC32 HeaderDigest for Response"
3114 " PDU 0x%08x\n", *header_digest);
3115 }
3116
3117 cmd->iov_misc_count = iov_count;
3118 cmd->tx_size = tx_size;
3119
3120 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3121 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3122 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3123 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3124
3125 return 0;
3126}
3127
3128static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3129{
3130 switch (se_tmr->response) {
3131 case TMR_FUNCTION_COMPLETE:
3132 return ISCSI_TMF_RSP_COMPLETE;
3133 case TMR_TASK_DOES_NOT_EXIST:
3134 return ISCSI_TMF_RSP_NO_TASK;
3135 case TMR_LUN_DOES_NOT_EXIST:
3136 return ISCSI_TMF_RSP_NO_LUN;
3137 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3138 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3139 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3140 return ISCSI_TMF_RSP_AUTH_FAILED;
3141 case TMR_FUNCTION_REJECTED:
3142 default:
3143 return ISCSI_TMF_RSP_REJECTED;
3144 }
3145}
3146
3147static int iscsit_send_task_mgt_rsp(
3148 struct iscsi_cmd *cmd,
3149 struct iscsi_conn *conn)
3150{
3151 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3152 struct iscsi_tm_rsp *hdr;
3153 u32 tx_size = 0;
3154
3155 hdr = (struct iscsi_tm_rsp *) cmd->pdu;
3156 memset(hdr, 0, ISCSI_HDR_LEN);
3157 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3158 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3159 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3160 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3161 cmd->stat_sn = conn->stat_sn++;
3162 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3163
3164 iscsit_increment_maxcmdsn(cmd, conn->sess);
3165 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3166 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3167
3168 cmd->iov_misc[0].iov_base = cmd->pdu;
3169 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3170 tx_size += ISCSI_HDR_LEN;
3171
3172 if (conn->conn_ops->HeaderDigest) {
3173 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3174
3175 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3176 (unsigned char *)hdr, ISCSI_HDR_LEN,
3177 0, NULL, (u8 *)header_digest);
3178
3179 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3180 tx_size += ISCSI_CRC_LEN;
3181 pr_debug("Attaching CRC32 HeaderDigest for Task"
3182 " Mgmt Response PDU 0x%08x\n", *header_digest);
3183 }
3184
3185 cmd->iov_misc_count = 1;
3186 cmd->tx_size = tx_size;
3187
3188 pr_debug("Built Task Management Response ITT: 0x%08x,"
3189 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3190 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3191
3192 return 0;
3193}
3194
2f9bc894
NB		 3195static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3196{
3197 bool ret = false;
3198
3199 if (np->np_sockaddr.ss_family == AF_INET6) {
3200 const struct sockaddr_in6 sin6 = {
3201 .sin6_addr = IN6ADDR_ANY_INIT };
3202 struct sockaddr_in6 *sock_in6 =
3203 (struct sockaddr_in6 *)&np->np_sockaddr;
3204
3205 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3206 sin6.sin6_addr.s6_addr, 16))
3207 ret = true;
3208 } else {
3209 struct sockaddr_in * sock_in =
3210 (struct sockaddr_in *)&np->np_sockaddr;
3211
cea0b4ce 3212 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3213 ret = true;
3214 }
3215
3216 return ret;
3217}
3218
8b1e1244
AG		 3219#define SENDTARGETS_BUF_LIMIT 32768U
3220
e48354ce
NB		 3221static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3222{
3223 char *payload = NULL;
3224 struct iscsi_conn *conn = cmd->conn;
3225 struct iscsi_portal_group *tpg;
3226 struct iscsi_tiqn *tiqn;
3227 struct iscsi_tpg_np *tpg_np;
3228 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3229 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
e48354ce 3230
8b1e1244
AG		 3231 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3232 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3233
3234 payload = kzalloc(buffer_len, GFP_KERNEL);
3235 if (!payload) {
3236 pr_err("Unable to allocate memory for sendtargets"
3237 " response.\n");
3238 return -ENOMEM;
3239 }
3240
3241 spin_lock(&tiqn_lock);
3242 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3243 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3244 len += 1;
3245
3246 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3247 end_of_buf = 1;
3248 goto eob;
3249 }
8359cf43 3250 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3251 payload_len += len;
3252
3253 spin_lock(&tiqn->tiqn_tpg_lock);
3254 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3255
3256 spin_lock(&tpg->tpg_state_lock);
3257 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3258 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3259 spin_unlock(&tpg->tpg_state_lock);
3260 continue;
3261 }
3262 spin_unlock(&tpg->tpg_state_lock);
3263
3264 spin_lock(&tpg->tpg_np_lock);
3265 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3266 tpg_np_list) {
2f9bc894
NB		 3267 struct iscsi_np *np = tpg_np->tpg_np;
3268 bool inaddr_any = iscsit_check_inaddr_any(np);
3269
e48354ce
NB		 3270 len = sprintf(buf, "TargetAddress="
3271 "%s%s%s:%hu,%hu",
2f9bc894
NB		 3272 (np->np_sockaddr.ss_family == AF_INET6) ?
3273 "[" : "", (inaddr_any == false) ?
3274 np->np_ip : conn->local_ip,
3275 (np->np_sockaddr.ss_family == AF_INET6) ?
3276 "]" : "", (inaddr_any == false) ?
3277 np->np_port : conn->local_port,
e48354ce
NB		 3278 tpg->tpgt);
3279 len += 1;
3280
3281 if ((len + payload_len) > buffer_len) {
3282 spin_unlock(&tpg->tpg_np_lock);
3283 spin_unlock(&tiqn->tiqn_tpg_lock);
3284 end_of_buf = 1;
3285 goto eob;
3286 }
8359cf43 3287 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3288 payload_len += len;
3289 }
3290 spin_unlock(&tpg->tpg_np_lock);
3291 }
3292 spin_unlock(&tiqn->tiqn_tpg_lock);
3293eob:
3294 if (end_of_buf)
3295 break;
3296 }
3297 spin_unlock(&tiqn_lock);
3298
3299 cmd->buf_ptr = payload;
3300
3301 return payload_len;
3302}
3303
3304/*
3305 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3306 * MaxRecvDataSegmentLength.
3307 */
3308static int iscsit_send_text_rsp(
3309 struct iscsi_cmd *cmd,
3310 struct iscsi_conn *conn)
3311{
3312 struct iscsi_text_rsp *hdr;
3313 struct kvec *iov;
3314 u32 padding = 0, tx_size = 0;
3315 int text_length, iov_count = 0;
3316
3317 text_length = iscsit_build_sendtargets_response(cmd);
3318 if (text_length < 0)
3319 return text_length;
3320
3321 padding = ((-text_length) & 3);
3322 if (padding != 0) {
3323 memset(cmd->buf_ptr + text_length, 0, padding);
3324 pr_debug("Attaching %u additional bytes for"
3325 " padding.\n", padding);
3326 }
3327
3328 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3329 memset(hdr, 0, ISCSI_HDR_LEN);
3330 hdr->opcode = ISCSI_OP_TEXT_RSP;
3331 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3332 hton24(hdr->dlength, text_length);
66c7db68 3333 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3334 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3335 cmd->stat_sn = conn->stat_sn++;
3336 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3337
3338 iscsit_increment_maxcmdsn(cmd, conn->sess);
3339 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3340 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3341
3342 iov = &cmd->iov_misc[0];
3343
3344 iov[iov_count].iov_base = cmd->pdu;
3345 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3346 iov[iov_count].iov_base = cmd->buf_ptr;
3347 iov[iov_count++].iov_len = text_length + padding;
3348
3349 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3350
3351 if (conn->conn_ops->HeaderDigest) {
3352 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3353
3354 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3355 (unsigned char *)hdr, ISCSI_HDR_LEN,
3356 0, NULL, (u8 *)header_digest);
3357
3358 iov[0].iov_len += ISCSI_CRC_LEN;
3359 tx_size += ISCSI_CRC_LEN;
3360 pr_debug("Attaching CRC32 HeaderDigest for"
3361 " Text Response PDU 0x%08x\n", *header_digest);
3362 }
3363
3364 if (conn->conn_ops->DataDigest) {
3365 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366 cmd->buf_ptr, (text_length + padding),
3367 0, NULL, (u8 *)&cmd->data_crc);
3368
3369 iov[iov_count].iov_base = &cmd->data_crc;
3370 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3371 tx_size += ISCSI_CRC_LEN;
3372
3373 pr_debug("Attaching DataDigest for %u bytes of text"
3374 " data, CRC 0x%08x\n", (text_length + padding),
3375 cmd->data_crc);
3376 }
3377
3378 cmd->iov_misc_count = iov_count;
3379 cmd->tx_size = tx_size;
3380
3381 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3382 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3383 text_length, conn->cid);
3384 return 0;
3385}
3386
3387static int iscsit_send_reject(
3388 struct iscsi_cmd *cmd,
3389 struct iscsi_conn *conn)
3390{
3391 u32 iov_count = 0, tx_size = 0;
3392 struct iscsi_reject *hdr;
3393 struct kvec *iov;
3394
3395 hdr = (struct iscsi_reject *) cmd->pdu;
3396 hdr->opcode = ISCSI_OP_REJECT;
3397 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3398 hton24(hdr->dlength, ISCSI_HDR_LEN);
50e5c87d 3399 hdr->ffffffff = cpu_to_be32(0xffffffff);
e48354ce
NB		 3400 cmd->stat_sn = conn->stat_sn++;
3401 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3402 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3403 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3404
3405 iov = &cmd->iov_misc[0];
3406
3407 iov[iov_count].iov_base = cmd->pdu;
3408 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3409 iov[iov_count].iov_base = cmd->buf_ptr;
3410 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3411
3412 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3413
3414 if (conn->conn_ops->HeaderDigest) {
3415 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3416
3417 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3418 (unsigned char *)hdr, ISCSI_HDR_LEN,
3419 0, NULL, (u8 *)header_digest);
3420
3421 iov[0].iov_len += ISCSI_CRC_LEN;
3422 tx_size += ISCSI_CRC_LEN;
3423 pr_debug("Attaching CRC32 HeaderDigest for"
3424 " REJECT PDU 0x%08x\n", *header_digest);
3425 }
3426
3427 if (conn->conn_ops->DataDigest) {
3428 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3429 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3430 0, NULL, (u8 *)&cmd->data_crc);
3431
3432 iov[iov_count].iov_base = &cmd->data_crc;
3433 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3434 tx_size += ISCSI_CRC_LEN;
3435 pr_debug("Attaching CRC32 DataDigest for REJECT"
3436 " PDU 0x%08x\n", cmd->data_crc);
3437 }
3438
3439 cmd->iov_misc_count = iov_count;
3440 cmd->tx_size = tx_size;
3441
3442 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3443 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3444
3445 return 0;
3446}
3447
e48354ce
NB		 3448void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3449{
3450 struct iscsi_thread_set *ts = conn->thread_set;
3451 int ord, cpu;
3452 /*
3453 * thread_id is assigned from iscsit_global->ts_bitmap from
3454 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3455 *
3456 * Here we use thread_id to determine which CPU that this
3457 * iSCSI connection's iscsi_thread_set will be scheduled to
3458 * execute upon.
3459 */
3460 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3461 for_each_online_cpu(cpu) {
3462 if (ord-- == 0) {
3463 cpumask_set_cpu(cpu, conn->conn_cpumask);
3464 return;
3465 }
3466 }
3467 /*
3468 * This should never be reached..
3469 */
3470 dump_stack();
3471 cpumask_setall(conn->conn_cpumask);
3472}
3473
3474static inline void iscsit_thread_check_cpumask(
3475 struct iscsi_conn *conn,
3476 struct task_struct *p,
3477 int mode)
3478{
3479 char buf[128];
3480 /*
3481 * mode == 1 signals iscsi_target_tx_thread() usage.
3482 * mode == 0 signals iscsi_target_rx_thread() usage.
3483 */
3484 if (mode == 1) {
3485 if (!conn->conn_tx_reset_cpumask)
3486 return;
3487 conn->conn_tx_reset_cpumask = 0;
3488 } else {
3489 if (!conn->conn_rx_reset_cpumask)
3490 return;
3491 conn->conn_rx_reset_cpumask = 0;
3492 }
3493 /*
3494 * Update the CPU mask for this single kthread so that
3495 * both TX and RX kthreads are scheduled to run on the
3496 * same CPU.
3497 */
3498 memset(buf, 0, 128);
3499 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3500 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3501}
3502
6f3c0e69 3503static int handle_immediate_queue(struct iscsi_conn *conn)
e48354ce 3504{
6f3c0e69
AG		 3505 struct iscsi_queue_req *qr;
3506 struct iscsi_cmd *cmd;
e48354ce 3507 u8 state;
6f3c0e69
AG		 3508 int ret;
3509
3510 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3511 atomic_set(&conn->check_immediate_queue, 0);
3512 cmd = qr->cmd;
3513 state = qr->state;
3514 kmem_cache_free(lio_qr_cache, qr);
3515
3516 switch (state) {
3517 case ISTATE_SEND_R2T:
3518 ret = iscsit_send_r2t(cmd, conn);
3519 if (ret < 0)
3520 goto err;
3521 break;
3522 case ISTATE_REMOVE:
3523 if (cmd->data_direction == DMA_TO_DEVICE)
3524 iscsit_stop_dataout_timer(cmd);
3525
3526 spin_lock_bh(&conn->cmd_lock);
3527 list_del(&cmd->i_conn_node);
3528 spin_unlock_bh(&conn->cmd_lock);
3529
3530 iscsit_free_cmd(cmd);
3531 continue;
3532 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3533 iscsit_mod_nopin_response_timer(conn);
3534 ret = iscsit_send_unsolicited_nopin(cmd,
3535 conn, 1);
3536 if (ret < 0)
3537 goto err;
3538 break;
3539 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3540 ret = iscsit_send_unsolicited_nopin(cmd,
3541 conn, 0);
3542 if (ret < 0)
3543 goto err;
3544 break;
3545 default:
3546 pr_err("Unknown Opcode: 0x%02x ITT:"
3547 " 0x%08x, i_state: %d on CID: %hu\n",
3548 cmd->iscsi_opcode, cmd->init_task_tag, state,
3549 conn->cid);
3550 goto err;
3551 }
3552 }
3553
3554 return 0;
3555
3556err:
3557 return -1;
3558}
3559
3560static int handle_response_queue(struct iscsi_conn *conn)
3561{
3562 struct iscsi_queue_req *qr;
3563 struct iscsi_cmd *cmd;
3564 u8 state;
3565 int ret;
3566
3567 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3568 cmd = qr->cmd;
3569 state = qr->state;
3570 kmem_cache_free(lio_qr_cache, qr);
3571
3572check_rsp_state:
3573 switch (state) {
3574 case ISTATE_SEND_DATAIN:
3575 ret = iscsit_send_data_in(cmd, conn);
3576 if (ret < 0)
3577 goto err;
3578 else if (!ret)
3579 /* more drs */
3580 goto check_rsp_state;
3581 else if (ret == 1) {
3582 /* all done */
3583 spin_lock_bh(&cmd->istate_lock);
3584 cmd->i_state = ISTATE_SENT_STATUS;
3585 spin_unlock_bh(&cmd->istate_lock);
3586 continue;
3587 } else if (ret == 2) {
3588 /* Still must send status,
3589 SCF_TRANSPORT_TASK_SENSE was set */
3590 spin_lock_bh(&cmd->istate_lock);
3591 cmd->i_state = ISTATE_SEND_STATUS;
3592 spin_unlock_bh(&cmd->istate_lock);
3593 state = ISTATE_SEND_STATUS;
3594 goto check_rsp_state;
3595 }
3596
3597 break;
3598 case ISTATE_SEND_STATUS:
3599 case ISTATE_SEND_STATUS_RECOVERY:
3600 ret = iscsit_send_status(cmd, conn);
3601 break;
3602 case ISTATE_SEND_LOGOUTRSP:
3603 ret = iscsit_send_logout_response(cmd, conn);
3604 break;
3605 case ISTATE_SEND_ASYNCMSG:
3606 ret = iscsit_send_conn_drop_async_message(
3607 cmd, conn);
3608 break;
3609 case ISTATE_SEND_NOPIN:
3610 ret = iscsit_send_nopin_response(cmd, conn);
3611 break;
3612 case ISTATE_SEND_REJECT:
3613 ret = iscsit_send_reject(cmd, conn);
3614 break;
3615 case ISTATE_SEND_TASKMGTRSP:
3616 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3617 if (ret != 0)
3618 break;
3619 ret = iscsit_tmr_post_handler(cmd, conn);
3620 if (ret != 0)
3621 iscsit_fall_back_to_erl0(conn->sess);
3622 break;
3623 case ISTATE_SEND_TEXTRSP:
3624 ret = iscsit_send_text_rsp(cmd, conn);
3625 break;
3626 default:
3627 pr_err("Unknown Opcode: 0x%02x ITT:"
3628 " 0x%08x, i_state: %d on CID: %hu\n",
3629 cmd->iscsi_opcode, cmd->init_task_tag,
3630 state, conn->cid);
3631 goto err;
3632 }
3633 if (ret < 0)
3634 goto err;
3635
3636 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3637 iscsit_tx_thread_wait_for_tcp(conn);
3638 iscsit_unmap_iovec(cmd);
3639 goto err;
3640 }
3641 iscsit_unmap_iovec(cmd);
3642
3643 switch (state) {
3644 case ISTATE_SEND_LOGOUTRSP:
3645 if (!iscsit_logout_post_handler(cmd, conn))
3646 goto restart;
3647 /* fall through */
3648 case ISTATE_SEND_STATUS:
3649 case ISTATE_SEND_ASYNCMSG:
3650 case ISTATE_SEND_NOPIN:
3651 case ISTATE_SEND_STATUS_RECOVERY:
3652 case ISTATE_SEND_TEXTRSP:
3653 case ISTATE_SEND_TASKMGTRSP:
3654 spin_lock_bh(&cmd->istate_lock);
3655 cmd->i_state = ISTATE_SENT_STATUS;
3656 spin_unlock_bh(&cmd->istate_lock);
3657 break;
3658 case ISTATE_SEND_REJECT:
3659 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3660 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3661 complete(&cmd->reject_comp);
3662 goto err;
3663 }
3664 complete(&cmd->reject_comp);
3665 break;
3666 default:
3667 pr_err("Unknown Opcode: 0x%02x ITT:"
3668 " 0x%08x, i_state: %d on CID: %hu\n",
3669 cmd->iscsi_opcode, cmd->init_task_tag,
3670 cmd->i_state, conn->cid);
3671 goto err;
3672 }
3673
3674 if (atomic_read(&conn->check_immediate_queue))
3675 break;
3676 }
3677
3678 return 0;
3679
3680err:
3681 return -1;
3682restart:
3683 return -EAGAIN;
3684}
3685
3686int iscsi_target_tx_thread(void *arg)
3687{
e48354ce 3688 int ret = 0;
e48354ce 3689 struct iscsi_conn *conn;
8359cf43 3690 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3691 /*
3692 * Allow ourselves to be interrupted by SIGINT so that a
3693 * connection recovery / failure event can be triggered externally.
3694 */
3695 allow_signal(SIGINT);
3696
3697restart:
3698 conn = iscsi_tx_thread_pre_handler(ts);
3699 if (!conn)
3700 goto out;
3701
6f3c0e69 3702 ret = 0;
e48354ce
NB		 3703
3704 while (!kthread_should_stop()) {
3705 /*
3706 * Ensure that both TX and RX per connection kthreads
3707 * are scheduled to run on the same CPU.
3708 */
3709 iscsit_thread_check_cpumask(conn, current, 1);
3710
d5627acb
RD		 3711 wait_event_interruptible(conn->queues_wq,
3712 !iscsit_conn_all_queues_empty(conn) ||
3713 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3714
3715 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3716 signal_pending(current))
3717 goto transport_err;
3718
6f3c0e69
AG		 3719 ret = handle_immediate_queue(conn);
3720 if (ret < 0)
3721 goto transport_err;
e48354ce 3722
6f3c0e69
AG		 3723 ret = handle_response_queue(conn);
3724 if (ret == -EAGAIN)
3725 goto restart;
3726 else if (ret < 0)
3727 goto transport_err;
e48354ce
NB		 3728 }
3729
3730transport_err:
3731 iscsit_take_action_for_connection_exit(conn);
3732 goto restart;
3733out:
3734 return 0;
3735}
3736
3737int iscsi_target_rx_thread(void *arg)
3738{
3739 int ret;
3740 u8 buffer[ISCSI_HDR_LEN], opcode;
3741 u32 checksum = 0, digest = 0;
3742 struct iscsi_conn *conn = NULL;
8359cf43 3743 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3744 struct kvec iov;
3745 /*
3746 * Allow ourselves to be interrupted by SIGINT so that a
3747 * connection recovery / failure event can be triggered externally.
3748 */
3749 allow_signal(SIGINT);
3750
3751restart:
3752 conn = iscsi_rx_thread_pre_handler(ts);
3753 if (!conn)
3754 goto out;
3755
3756 while (!kthread_should_stop()) {
3757 /*
3758 * Ensure that both TX and RX per connection kthreads
3759 * are scheduled to run on the same CPU.
3760 */
3761 iscsit_thread_check_cpumask(conn, current, 0);
3762
3763 memset(buffer, 0, ISCSI_HDR_LEN);
3764 memset(&iov, 0, sizeof(struct kvec));
3765
3766 iov.iov_base = buffer;
3767 iov.iov_len = ISCSI_HDR_LEN;
3768
3769 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3770 if (ret != ISCSI_HDR_LEN) {
3771 iscsit_rx_thread_wait_for_tcp(conn);
3772 goto transport_err;
3773 }
3774
3775 /*
3776 * Set conn->bad_hdr for use with REJECT PDUs.
3777 */
3778 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3779
3780 if (conn->conn_ops->HeaderDigest) {
3781 iov.iov_base = &digest;
3782 iov.iov_len = ISCSI_CRC_LEN;
3783
3784 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3785 if (ret != ISCSI_CRC_LEN) {
3786 iscsit_rx_thread_wait_for_tcp(conn);
3787 goto transport_err;
3788 }
3789
3790 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3791 buffer, ISCSI_HDR_LEN,
3792 0, NULL, (u8 *)&checksum);
3793
3794 if (digest != checksum) {
3795 pr_err("HeaderDigest CRC32C failed,"
3796 " received 0x%08x, computed 0x%08x\n",
3797 digest, checksum);
3798 /*
3799 * Set the PDU to 0xff so it will intentionally
3800 * hit default in the switch below.
3801 */
3802 memset(buffer, 0xff, ISCSI_HDR_LEN);
3803 spin_lock_bh(&conn->sess->session_stats_lock);
3804 conn->sess->conn_digest_errors++;
3805 spin_unlock_bh(&conn->sess->session_stats_lock);
3806 } else {
3807 pr_debug("Got HeaderDigest CRC32C"
3808 " 0x%08x\n", checksum);
3809 }
3810 }
3811
3812 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3813 goto transport_err;
3814
3815 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3816
3817 if (conn->sess->sess_ops->SessionType &&
3818 ((!(opcode & ISCSI_OP_TEXT)) ||
3819 (!(opcode & ISCSI_OP_LOGOUT)))) {
3820 pr_err("Received illegal iSCSI Opcode: 0x%02x"
3821 " while in Discovery Session, rejecting.\n", opcode);
3822 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3823 buffer, conn);
3824 goto transport_err;
3825 }
3826
3827 switch (opcode) {
3828 case ISCSI_OP_SCSI_CMD:
3829 if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3830 goto transport_err;
3831 break;
3832 case ISCSI_OP_SCSI_DATA_OUT:
3833 if (iscsit_handle_data_out(conn, buffer) < 0)
3834 goto transport_err;
3835 break;
3836 case ISCSI_OP_NOOP_OUT:
3837 if (iscsit_handle_nop_out(conn, buffer) < 0)
3838 goto transport_err;
3839 break;
3840 case ISCSI_OP_SCSI_TMFUNC:
3841 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3842 goto transport_err;
3843 break;
3844 case ISCSI_OP_TEXT:
3845 if (iscsit_handle_text_cmd(conn, buffer) < 0)
3846 goto transport_err;
3847 break;
3848 case ISCSI_OP_LOGOUT:
3849 ret = iscsit_handle_logout_cmd(conn, buffer);
3850 if (ret > 0) {
3851 wait_for_completion_timeout(&conn->conn_logout_comp,
3852 SECONDS_FOR_LOGOUT_COMP * HZ);
3853 goto transport_err;
3854 } else if (ret < 0)
3855 goto transport_err;
3856 break;
3857 case ISCSI_OP_SNACK:
3858 if (iscsit_handle_snack(conn, buffer) < 0)
3859 goto transport_err;
3860 break;
3861 default:
3862 pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3863 opcode);
3864 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3865 pr_err("Cannot recover from unknown"
3866 " opcode while ERL=0, closing iSCSI connection"
3867 ".\n");
3868 goto transport_err;
3869 }
3870 if (!conn->conn_ops->OFMarker) {
3871 pr_err("Unable to recover from unknown"
3872 " opcode while OFMarker=No, closing iSCSI"
3873 " connection.\n");
3874 goto transport_err;
3875 }
3876 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3877 pr_err("Unable to recover from unknown"
3878 " opcode, closing iSCSI connection.\n");
3879 goto transport_err;
3880 }
3881 break;
3882 }
3883 }
3884
3885transport_err:
3886 if (!signal_pending(current))
3887 atomic_set(&conn->transport_failed, 1);
3888 iscsit_take_action_for_connection_exit(conn);
3889 goto restart;
3890out:
3891 return 0;
3892}
3893
3894static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3895{
3896 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3897 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 3898 /*
3899 * We expect this function to only ever be called from either RX or TX
3900 * thread context via iscsit_close_connection() once the other context
3901 * has been reset -> returned sleeping pre-handler state.
3902 */
3903 spin_lock_bh(&conn->cmd_lock);
2fbb471e 3904 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 3905
2fbb471e 3906 list_del(&cmd->i_conn_node);
e48354ce
NB		 3907 spin_unlock_bh(&conn->cmd_lock);
3908
3909 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 3910
d270190a 3911 iscsit_free_cmd(cmd);
e48354ce
NB		 3912
3913 spin_lock_bh(&conn->cmd_lock);
3914 }
3915 spin_unlock_bh(&conn->cmd_lock);
3916}
3917
3918static void iscsit_stop_timers_for_cmds(
3919 struct iscsi_conn *conn)
3920{
3921 struct iscsi_cmd *cmd;
3922
3923 spin_lock_bh(&conn->cmd_lock);
2fbb471e 3924 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 3925 if (cmd->data_direction == DMA_TO_DEVICE)
3926 iscsit_stop_dataout_timer(cmd);
3927 }
3928 spin_unlock_bh(&conn->cmd_lock);
3929}
3930
3931int iscsit_close_connection(
3932 struct iscsi_conn *conn)
3933{
3934 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3935 struct iscsi_session *sess = conn->sess;
3936
3937 pr_debug("Closing iSCSI connection CID %hu on SID:"
3938 " %u\n", conn->cid, sess->sid);
3939 /*
3940 * Always up conn_logout_comp just in case the RX Thread is sleeping
3941 * and the logout response never got sent because the connection
3942 * failed.
3943 */
3944 complete(&conn->conn_logout_comp);
3945
3946 iscsi_release_thread_set(conn);
3947
3948 iscsit_stop_timers_for_cmds(conn);
3949 iscsit_stop_nopin_response_timer(conn);
3950 iscsit_stop_nopin_timer(conn);
3951 iscsit_free_queue_reqs_for_conn(conn);
3952
3953 /*
3954 * During Connection recovery drop unacknowledged out of order
3955 * commands for this connection, and prepare the other commands
3956 * for realligence.
3957 *
3958 * During normal operation clear the out of order commands (but
3959 * do not free the struct iscsi_ooo_cmdsn's) and release all
3960 * struct iscsi_cmds.
3961 */
3962 if (atomic_read(&conn->connection_recovery)) {
3963 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3964 iscsit_prepare_cmds_for_realligance(conn);
3965 } else {
3966 iscsit_clear_ooo_cmdsns_for_conn(conn);
3967 iscsit_release_commands_from_conn(conn);
3968 }
3969
3970 /*
3971 * Handle decrementing session or connection usage count if
3972 * a logout response was not able to be sent because the
3973 * connection failed. Fall back to Session Recovery here.
3974 */
3975 if (atomic_read(&conn->conn_logout_remove)) {
3976 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3977 iscsit_dec_conn_usage_count(conn);
3978 iscsit_dec_session_usage_count(sess);
3979 }
3980 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3981 iscsit_dec_conn_usage_count(conn);
3982
3983 atomic_set(&conn->conn_logout_remove, 0);
3984 atomic_set(&sess->session_reinstatement, 0);
3985 atomic_set(&sess->session_fall_back_to_erl0, 1);
3986 }
3987
3988 spin_lock_bh(&sess->conn_lock);
3989 list_del(&conn->conn_list);
3990
3991 /*
3992 * Attempt to let the Initiator know this connection failed by
3993 * sending an Connection Dropped Async Message on another
3994 * active connection.
3995 */
3996 if (atomic_read(&conn->connection_recovery))
3997 iscsit_build_conn_drop_async_message(conn);
3998
3999 spin_unlock_bh(&sess->conn_lock);
4000
4001 /*
4002 * If connection reinstatement is being performed on this connection,
4003 * up the connection reinstatement semaphore that is being blocked on
4004 * in iscsit_cause_connection_reinstatement().
4005 */
4006 spin_lock_bh(&conn->state_lock);
4007 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4008 spin_unlock_bh(&conn->state_lock);
4009 complete(&conn->conn_wait_comp);
4010 wait_for_completion(&conn->conn_post_wait_comp);
4011 spin_lock_bh(&conn->state_lock);
4012 }
4013
4014 /*
4015 * If connection reinstatement is being performed on this connection
4016 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4017 * connection wait rcfr semaphore that is being blocked on
4018 * an iscsit_connection_reinstatement_rcfr().
4019 */
4020 if (atomic_read(&conn->connection_wait_rcfr)) {
4021 spin_unlock_bh(&conn->state_lock);
4022 complete(&conn->conn_wait_rcfr_comp);
4023 wait_for_completion(&conn->conn_post_wait_comp);
4024 spin_lock_bh(&conn->state_lock);
4025 }
4026 atomic_set(&conn->connection_reinstatement, 1);
4027 spin_unlock_bh(&conn->state_lock);
4028
4029 /*
4030 * If any other processes are accessing this connection pointer we
4031 * must wait until they have completed.
4032 */
4033 iscsit_check_conn_usage_count(conn);
4034
4035 if (conn->conn_rx_hash.tfm)
4036 crypto_free_hash(conn->conn_rx_hash.tfm);
4037 if (conn->conn_tx_hash.tfm)
4038 crypto_free_hash(conn->conn_tx_hash.tfm);
4039
4040 if (conn->conn_cpumask)
4041 free_cpumask_var(conn->conn_cpumask);
4042
4043 kfree(conn->conn_ops);
4044 conn->conn_ops = NULL;
4045
bf6932f4 4046 if (conn->sock)
e48354ce 4047 sock_release(conn->sock);
e48354ce
NB		 4048 conn->thread_set = NULL;
4049
4050 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4051 conn->conn_state = TARG_CONN_STATE_FREE;
4052 kfree(conn);
4053
4054 spin_lock_bh(&sess->conn_lock);
4055 atomic_dec(&sess->nconn);
4056 pr_debug("Decremented iSCSI connection count to %hu from node:"
4057 " %s\n", atomic_read(&sess->nconn),
4058 sess->sess_ops->InitiatorName);
4059 /*
4060 * Make sure that if one connection fails in an non ERL=2 iSCSI
4061 * Session that they all fail.
4062 */
4063 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4064 !atomic_read(&sess->session_logout))
4065 atomic_set(&sess->session_fall_back_to_erl0, 1);
4066
4067 /*
4068 * If this was not the last connection in the session, and we are
4069 * performing session reinstatement or falling back to ERL=0, call
4070 * iscsit_stop_session() without sleeping to shutdown the other
4071 * active connections.
4072 */
4073 if (atomic_read(&sess->nconn)) {
4074 if (!atomic_read(&sess->session_reinstatement) &&
4075 !atomic_read(&sess->session_fall_back_to_erl0)) {
4076 spin_unlock_bh(&sess->conn_lock);
4077 return 0;
4078 }
4079 if (!atomic_read(&sess->session_stop_active)) {
4080 atomic_set(&sess->session_stop_active, 1);
4081 spin_unlock_bh(&sess->conn_lock);
4082 iscsit_stop_session(sess, 0, 0);
4083 return 0;
4084 }
4085 spin_unlock_bh(&sess->conn_lock);
4086 return 0;
4087 }
4088
4089 /*
4090 * If this was the last connection in the session and one of the
4091 * following is occurring:
4092 *
4093 * Session Reinstatement is not being performed, and are falling back
4094 * to ERL=0 call iscsit_close_session().
4095 *
4096 * Session Logout was requested. iscsit_close_session() will be called
4097 * elsewhere.
4098 *
4099 * Session Continuation is not being performed, start the Time2Retain
4100 * handler and check if sleep_on_sess_wait_sem is active.
4101 */
4102 if (!atomic_read(&sess->session_reinstatement) &&
4103 atomic_read(&sess->session_fall_back_to_erl0)) {
4104 spin_unlock_bh(&sess->conn_lock);
99367f01 4105 target_put_session(sess->se_sess);
e48354ce
NB		 4106
4107 return 0;
4108 } else if (atomic_read(&sess->session_logout)) {
4109 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4110 sess->session_state = TARG_SESS_STATE_FREE;
4111 spin_unlock_bh(&sess->conn_lock);
4112
4113 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4114 complete(&sess->session_wait_comp);
4115
4116 return 0;
4117 } else {
4118 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4119 sess->session_state = TARG_SESS_STATE_FAILED;
4120
4121 if (!atomic_read(&sess->session_continuation)) {
4122 spin_unlock_bh(&sess->conn_lock);
4123 iscsit_start_time2retain_handler(sess);
4124 } else
4125 spin_unlock_bh(&sess->conn_lock);
4126
4127 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4128 complete(&sess->session_wait_comp);
4129
4130 return 0;
4131 }
4132 spin_unlock_bh(&sess->conn_lock);
4133
4134 return 0;
4135}
4136
4137int iscsit_close_session(struct iscsi_session *sess)
4138{
4139 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4140 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4141
4142 if (atomic_read(&sess->nconn)) {
4143 pr_err("%d connection(s) still exist for iSCSI session"
4144 " to %s\n", atomic_read(&sess->nconn),
4145 sess->sess_ops->InitiatorName);
4146 BUG();
4147 }
4148
4149 spin_lock_bh(&se_tpg->session_lock);
4150 atomic_set(&sess->session_logout, 1);
4151 atomic_set(&sess->session_reinstatement, 1);
4152 iscsit_stop_time2retain_timer(sess);
4153 spin_unlock_bh(&se_tpg->session_lock);
4154
4155 /*
4156 * transport_deregister_session_configfs() will clear the
4157 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4158 * can be setting it again with __transport_register_session() in
4159 * iscsi_post_login_handler() again after the iscsit_stop_session()
4160 * completes in iscsi_np context.
4161 */
4162 transport_deregister_session_configfs(sess->se_sess);
4163
4164 /*
4165 * If any other processes are accessing this session pointer we must
4166 * wait until they have completed. If we are in an interrupt (the
4167 * time2retain handler) and contain and active session usage count we
4168 * restart the timer and exit.
4169 */
4170 if (!in_interrupt()) {
4171 if (iscsit_check_session_usage_count(sess) == 1)
4172 iscsit_stop_session(sess, 1, 1);
4173 } else {
4174 if (iscsit_check_session_usage_count(sess) == 2) {
4175 atomic_set(&sess->session_logout, 0);
4176 iscsit_start_time2retain_handler(sess);
4177 return 0;
4178 }
4179 }
4180
4181 transport_deregister_session(sess->se_sess);
4182
4183 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4184 iscsit_free_connection_recovery_entires(sess);
4185
4186 iscsit_free_all_ooo_cmdsns(sess);
4187
4188 spin_lock_bh(&se_tpg->session_lock);
4189 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4190 sess->session_state = TARG_SESS_STATE_FREE;
4191 pr_debug("Released iSCSI session from node: %s\n",
4192 sess->sess_ops->InitiatorName);
4193 tpg->nsessions--;
4194 if (tpg->tpg_tiqn)
4195 tpg->tpg_tiqn->tiqn_nsessions--;
4196
4197 pr_debug("Decremented number of active iSCSI Sessions on"
4198 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4199
4200 spin_lock(&sess_idr_lock);
4201 idr_remove(&sess_idr, sess->session_index);
4202 spin_unlock(&sess_idr_lock);
4203
4204 kfree(sess->sess_ops);
4205 sess->sess_ops = NULL;
4206 spin_unlock_bh(&se_tpg->session_lock);
4207
4208 kfree(sess);
4209 return 0;
4210}
4211
4212static void iscsit_logout_post_handler_closesession(
4213 struct iscsi_conn *conn)
4214{
4215 struct iscsi_session *sess = conn->sess;
4216
4217 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4218 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4219
4220 atomic_set(&conn->conn_logout_remove, 0);
4221 complete(&conn->conn_logout_comp);
4222
4223 iscsit_dec_conn_usage_count(conn);
4224 iscsit_stop_session(sess, 1, 1);
4225 iscsit_dec_session_usage_count(sess);
99367f01 4226 target_put_session(sess->se_sess);
e48354ce
NB		 4227}
4228
4229static void iscsit_logout_post_handler_samecid(
4230 struct iscsi_conn *conn)
4231{
4232 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4233 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4234
4235 atomic_set(&conn->conn_logout_remove, 0);
4236 complete(&conn->conn_logout_comp);
4237
4238 iscsit_cause_connection_reinstatement(conn, 1);
4239 iscsit_dec_conn_usage_count(conn);
4240}
4241
4242static void iscsit_logout_post_handler_diffcid(
4243 struct iscsi_conn *conn,
4244 u16 cid)
4245{
4246 struct iscsi_conn *l_conn;
4247 struct iscsi_session *sess = conn->sess;
4248
4249 if (!sess)
4250 return;
4251
4252 spin_lock_bh(&sess->conn_lock);
4253 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4254 if (l_conn->cid == cid) {
4255 iscsit_inc_conn_usage_count(l_conn);
4256 break;
4257 }
4258 }
4259 spin_unlock_bh(&sess->conn_lock);
4260
4261 if (!l_conn)
4262 return;
4263
4264 if (l_conn->sock)
4265 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4266
4267 spin_lock_bh(&l_conn->state_lock);
4268 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4269 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4270 spin_unlock_bh(&l_conn->state_lock);
4271
4272 iscsit_cause_connection_reinstatement(l_conn, 1);
4273 iscsit_dec_conn_usage_count(l_conn);
4274}
4275
4276/*
4277 * Return of 0 causes the TX thread to restart.
4278 */
4279static int iscsit_logout_post_handler(
4280 struct iscsi_cmd *cmd,
4281 struct iscsi_conn *conn)
4282{
4283 int ret = 0;
4284
4285 switch (cmd->logout_reason) {
4286 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4287 switch (cmd->logout_response) {
4288 case ISCSI_LOGOUT_SUCCESS:
4289 case ISCSI_LOGOUT_CLEANUP_FAILED:
4290 default:
4291 iscsit_logout_post_handler_closesession(conn);
4292 break;
4293 }
4294 ret = 0;
4295 break;
4296 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4297 if (conn->cid == cmd->logout_cid) {
4298 switch (cmd->logout_response) {
4299 case ISCSI_LOGOUT_SUCCESS:
4300 case ISCSI_LOGOUT_CLEANUP_FAILED:
4301 default:
4302 iscsit_logout_post_handler_samecid(conn);
4303 break;
4304 }
4305 ret = 0;
4306 } else {
4307 switch (cmd->logout_response) {
4308 case ISCSI_LOGOUT_SUCCESS:
4309 iscsit_logout_post_handler_diffcid(conn,
4310 cmd->logout_cid);
4311 break;
4312 case ISCSI_LOGOUT_CID_NOT_FOUND:
4313 case ISCSI_LOGOUT_CLEANUP_FAILED:
4314 default:
4315 break;
4316 }
4317 ret = 1;
4318 }
4319 break;
4320 case ISCSI_LOGOUT_REASON_RECOVERY:
4321 switch (cmd->logout_response) {
4322 case ISCSI_LOGOUT_SUCCESS:
4323 case ISCSI_LOGOUT_CID_NOT_FOUND:
4324 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4325 case ISCSI_LOGOUT_CLEANUP_FAILED:
4326 default:
4327 break;
4328 }
4329 ret = 1;
4330 break;
4331 default:
4332 break;
4333
4334 }
4335 return ret;
4336}
4337
4338void iscsit_fail_session(struct iscsi_session *sess)
4339{
4340 struct iscsi_conn *conn;
4341
4342 spin_lock_bh(&sess->conn_lock);
4343 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4344 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4345 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4346 }
4347 spin_unlock_bh(&sess->conn_lock);
4348
4349 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4350 sess->session_state = TARG_SESS_STATE_FAILED;
4351}
4352
4353int iscsit_free_session(struct iscsi_session *sess)
4354{
4355 u16 conn_count = atomic_read(&sess->nconn);
4356 struct iscsi_conn *conn, *conn_tmp = NULL;
4357 int is_last;
4358
4359 spin_lock_bh(&sess->conn_lock);
4360 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4361
4362 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4363 conn_list) {
4364 if (conn_count == 0)
4365 break;
4366
4367 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4368 is_last = 1;
4369 } else {
4370 iscsit_inc_conn_usage_count(conn_tmp);
4371 is_last = 0;
4372 }
4373 iscsit_inc_conn_usage_count(conn);
4374
4375 spin_unlock_bh(&sess->conn_lock);
4376 iscsit_cause_connection_reinstatement(conn, 1);
4377 spin_lock_bh(&sess->conn_lock);
4378
4379 iscsit_dec_conn_usage_count(conn);
4380 if (is_last == 0)
4381 iscsit_dec_conn_usage_count(conn_tmp);
4382
4383 conn_count--;
4384 }
4385
4386 if (atomic_read(&sess->nconn)) {
4387 spin_unlock_bh(&sess->conn_lock);
4388 wait_for_completion(&sess->session_wait_comp);
4389 } else
4390 spin_unlock_bh(&sess->conn_lock);
4391
99367f01 4392 target_put_session(sess->se_sess);
e48354ce
NB		 4393 return 0;
4394}
4395
4396void iscsit_stop_session(
4397 struct iscsi_session *sess,
4398 int session_sleep,
4399 int connection_sleep)
4400{
4401 u16 conn_count = atomic_read(&sess->nconn);
4402 struct iscsi_conn *conn, *conn_tmp = NULL;
4403 int is_last;
4404
4405 spin_lock_bh(&sess->conn_lock);
4406 if (session_sleep)
4407 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4408
4409 if (connection_sleep) {
4410 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4411 conn_list) {
4412 if (conn_count == 0)
4413 break;
4414
4415 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4416 is_last = 1;
4417 } else {
4418 iscsit_inc_conn_usage_count(conn_tmp);
4419 is_last = 0;
4420 }
4421 iscsit_inc_conn_usage_count(conn);
4422
4423 spin_unlock_bh(&sess->conn_lock);
4424 iscsit_cause_connection_reinstatement(conn, 1);
4425 spin_lock_bh(&sess->conn_lock);
4426
4427 iscsit_dec_conn_usage_count(conn);
4428 if (is_last == 0)
4429 iscsit_dec_conn_usage_count(conn_tmp);
4430 conn_count--;
4431 }
4432 } else {
4433 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4434 iscsit_cause_connection_reinstatement(conn, 0);
4435 }
4436
4437 if (session_sleep && atomic_read(&sess->nconn)) {
4438 spin_unlock_bh(&sess->conn_lock);
4439 wait_for_completion(&sess->session_wait_comp);
4440 } else
4441 spin_unlock_bh(&sess->conn_lock);
4442}
4443
4444int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4445{
4446 struct iscsi_session *sess;
4447 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4448 struct se_session *se_sess, *se_sess_tmp;
4449 int session_count = 0;
4450
4451 spin_lock_bh(&se_tpg->session_lock);
4452 if (tpg->nsessions && !force) {
4453 spin_unlock_bh(&se_tpg->session_lock);
4454 return -1;
4455 }
4456
4457 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4458 sess_list) {
4459 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4460
4461 spin_lock(&sess->conn_lock);
4462 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4463 atomic_read(&sess->session_logout) ||
4464 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4465 spin_unlock(&sess->conn_lock);
4466 continue;
4467 }
4468 atomic_set(&sess->session_reinstatement, 1);
4469 spin_unlock(&sess->conn_lock);
4470 spin_unlock_bh(&se_tpg->session_lock);
4471
4472 iscsit_free_session(sess);
4473 spin_lock_bh(&se_tpg->session_lock);
4474
4475 session_count++;
4476 }
4477 spin_unlock_bh(&se_tpg->session_lock);
4478
4479 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4480 " Group: %hu\n", session_count, tpg->tpgt);
4481 return 0;
4482}
4483
4484MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4485MODULE_VERSION("4.1.x");
4486MODULE_AUTHOR("nab@Linux-iSCSI.org");
4487MODULE_LICENSE("GPL");
4488
4489module_init(iscsi_target_init_module);
4490module_exit(iscsi_target_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)