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ARM: ignore memory below PHYS_OFFSET
[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
baa4d64b
NB		 52#include <target/iscsi/iscsi_transport.h>
53
e48354ce
NB		 54static LIST_HEAD(g_tiqn_list);
55static LIST_HEAD(g_np_list);
56static DEFINE_SPINLOCK(tiqn_lock);
85c3c54b 57static DEFINE_MUTEX(np_lock);
e48354ce
NB		 58
59static struct idr tiqn_idr;
60struct idr sess_idr;
61struct mutex auth_id_lock;
62spinlock_t sess_idr_lock;
63
64struct iscsit_global *iscsit_global;
65
66struct kmem_cache *lio_cmd_cache;
67struct kmem_cache *lio_qr_cache;
68struct kmem_cache *lio_dr_cache;
69struct kmem_cache *lio_ooo_cache;
70struct kmem_cache *lio_r2t_cache;
71
72static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 73 struct iscsi_scsi_req *, u32);
e48354ce
NB		 74
75struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
76{
77 struct iscsi_tiqn *tiqn = NULL;
78
79 spin_lock(&tiqn_lock);
80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
81 if (!strcmp(tiqn->tiqn, buf)) {
82
83 spin_lock(&tiqn->tiqn_state_lock);
84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
85 tiqn->tiqn_access_count++;
86 spin_unlock(&tiqn->tiqn_state_lock);
87 spin_unlock(&tiqn_lock);
88 return tiqn;
89 }
90 spin_unlock(&tiqn->tiqn_state_lock);
91 }
92 }
93 spin_unlock(&tiqn_lock);
94
95 return NULL;
96}
97
98static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
99{
100 spin_lock(&tiqn->tiqn_state_lock);
101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
103 spin_unlock(&tiqn->tiqn_state_lock);
104 return 0;
105 }
106 spin_unlock(&tiqn->tiqn_state_lock);
107
108 return -1;
109}
110
111void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
112{
113 spin_lock(&tiqn->tiqn_state_lock);
114 tiqn->tiqn_access_count--;
115 spin_unlock(&tiqn->tiqn_state_lock);
116}
117
118/*
119 * Note that IQN formatting is expected to be done in userspace, and
120 * no explict IQN format checks are done here.
121 */
122struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
123{
124 struct iscsi_tiqn *tiqn = NULL;
125 int ret;
126
8f50c7f5 127 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 128 pr_err("Target IQN exceeds %d bytes\n",
129 ISCSI_IQN_LEN);
130 return ERR_PTR(-EINVAL);
131 }
132
133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
134 if (!tiqn) {
135 pr_err("Unable to allocate struct iscsi_tiqn\n");
136 return ERR_PTR(-ENOMEM);
137 }
138
139 sprintf(tiqn->tiqn, "%s", buf);
140 INIT_LIST_HEAD(&tiqn->tiqn_list);
141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
142 spin_lock_init(&tiqn->tiqn_state_lock);
143 spin_lock_init(&tiqn->tiqn_tpg_lock);
144 spin_lock_init(&tiqn->sess_err_stats.lock);
145 spin_lock_init(&tiqn->login_stats.lock);
146 spin_lock_init(&tiqn->logout_stats.lock);
147
e48354ce
NB		 148 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
149
c9365bd0 150 idr_preload(GFP_KERNEL);
e48354ce 151 spin_lock(&tiqn_lock);
c9365bd0
TH		 152
153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 154 if (ret < 0) {
c9365bd0 155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 156 spin_unlock(&tiqn_lock);
c9365bd0 157 idr_preload_end();
e48354ce
NB		 158 kfree(tiqn);
159 return ERR_PTR(ret);
160 }
c9365bd0 161 tiqn->tiqn_index = ret;
e48354ce 162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 163
e48354ce 164 spin_unlock(&tiqn_lock);
c9365bd0 165 idr_preload_end();
e48354ce
NB		 166
167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
168
169 return tiqn;
170
171}
172
173static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
174{
175 /*
176 * Wait for accesses to said struct iscsi_tiqn to end.
177 */
178 spin_lock(&tiqn->tiqn_state_lock);
179 while (tiqn->tiqn_access_count != 0) {
180 spin_unlock(&tiqn->tiqn_state_lock);
181 msleep(10);
182 spin_lock(&tiqn->tiqn_state_lock);
183 }
184 spin_unlock(&tiqn->tiqn_state_lock);
185}
186
187void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
188{
189 /*
190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
191 * while holding tiqn->tiqn_state_lock. This means that all subsequent
192 * attempts to access this struct iscsi_tiqn will fail from both transport
193 * fabric and control code paths.
194 */
195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
196 pr_err("iscsit_set_tiqn_shutdown() failed\n");
197 return;
198 }
199
200 iscsit_wait_for_tiqn(tiqn);
201
202 spin_lock(&tiqn_lock);
203 list_del(&tiqn->tiqn_list);
204 idr_remove(&tiqn_idr, tiqn->tiqn_index);
205 spin_unlock(&tiqn_lock);
206
207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
208 tiqn->tiqn);
209 kfree(tiqn);
210}
211
212int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
213{
214 int ret;
215 /*
216 * Determine if the network portal is accepting storage traffic.
217 */
218 spin_lock_bh(&np->np_thread_lock);
219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
220 spin_unlock_bh(&np->np_thread_lock);
221 return -1;
222 }
223 if (np->np_login_tpg) {
224 pr_err("np->np_login_tpg() is not NULL!\n");
225 spin_unlock_bh(&np->np_thread_lock);
226 return -1;
227 }
228 spin_unlock_bh(&np->np_thread_lock);
229 /*
230 * Determine if the portal group is accepting storage traffic.
231 */
232 spin_lock_bh(&tpg->tpg_state_lock);
233 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
234 spin_unlock_bh(&tpg->tpg_state_lock);
235 return -1;
236 }
237 spin_unlock_bh(&tpg->tpg_state_lock);
238
239 /*
240 * Here we serialize access across the TIQN+TPG Tuple.
241 */
242 ret = mutex_lock_interruptible(&tpg->np_login_lock);
243 if ((ret != 0) || signal_pending(current))
244 return -1;
245
246 spin_lock_bh(&np->np_thread_lock);
247 np->np_login_tpg = tpg;
248 spin_unlock_bh(&np->np_thread_lock);
249
250 return 0;
251}
252
253int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
254{
255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
256
257 spin_lock_bh(&np->np_thread_lock);
258 np->np_login_tpg = NULL;
259 spin_unlock_bh(&np->np_thread_lock);
260
261 mutex_unlock(&tpg->np_login_lock);
262
263 if (tiqn)
264 iscsit_put_tiqn_for_login(tiqn);
265
266 return 0;
267}
268
05b96892 269bool iscsit_check_np_match(
e48354ce 270 struct __kernel_sockaddr_storage *sockaddr,
05b96892 271 struct iscsi_np *np,
e48354ce
NB		 272 int network_transport)
273{
274 struct sockaddr_in *sock_in, *sock_in_e;
275 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 276 bool ip_match = false;
e48354ce
NB		 277 u16 port;
278
05b96892
NB		 279 if (sockaddr->ss_family == AF_INET6) {
280 sock_in6 = (struct sockaddr_in6 *)sockaddr;
281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
282
283 if (!memcmp(&sock_in6->sin6_addr.in6_u,
284 &sock_in6_e->sin6_addr.in6_u,
285 sizeof(struct in6_addr)))
286 ip_match = true;
287
288 port = ntohs(sock_in6->sin6_port);
289 } else {
290 sock_in = (struct sockaddr_in *)sockaddr;
291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
292
293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
294 ip_match = true;
295
296 port = ntohs(sock_in->sin_port);
297 }
298
299 if ((ip_match == true) && (np->np_port == port) &&
300 (np->np_network_transport == network_transport))
301 return true;
302
303 return false;
304}
305
85c3c54b
AG		 306/*
307 * Called with mutex np_lock held
308 */
05b96892
NB		 309static struct iscsi_np *iscsit_get_np(
310 struct __kernel_sockaddr_storage *sockaddr,
311 int network_transport)
312{
313 struct iscsi_np *np;
314 bool match;
315
e48354ce 316 list_for_each_entry(np, &g_np_list, np_list) {
85c3c54b 317 spin_lock_bh(&np->np_thread_lock);
e48354ce 318 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
85c3c54b 319 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 320 continue;
321 }
322
05b96892
NB		 323 match = iscsit_check_np_match(sockaddr, np, network_transport);
324 if (match == true) {
e48354ce
NB		 325 /*
326 * Increment the np_exports reference count now to
327 * prevent iscsit_del_np() below from being called
328 * while iscsi_tpg_add_network_portal() is called.
329 */
330 np->np_exports++;
85c3c54b 331 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 332 return np;
333 }
85c3c54b 334 spin_unlock_bh(&np->np_thread_lock);
e48354ce 335 }
e48354ce
NB		 336
337 return NULL;
338}
339
340struct iscsi_np *iscsit_add_np(
341 struct __kernel_sockaddr_storage *sockaddr,
342 char *ip_str,
343 int network_transport)
344{
345 struct sockaddr_in *sock_in;
346 struct sockaddr_in6 *sock_in6;
347 struct iscsi_np *np;
348 int ret;
85c3c54b
AG		 349
350 mutex_lock(&np_lock);
351
e48354ce
NB		 352 /*
353 * Locate the existing struct iscsi_np if already active..
354 */
355 np = iscsit_get_np(sockaddr, network_transport);
85c3c54b
AG		 356 if (np) {
357 mutex_unlock(&np_lock);
e48354ce 358 return np;
85c3c54b 359 }
e48354ce
NB		 360
361 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
362 if (!np) {
363 pr_err("Unable to allocate memory for struct iscsi_np\n");
85c3c54b 364 mutex_unlock(&np_lock);
e48354ce
NB		 365 return ERR_PTR(-ENOMEM);
366 }
367
368 np->np_flags |= NPF_IP_NETWORK;
369 if (sockaddr->ss_family == AF_INET6) {
370 sock_in6 = (struct sockaddr_in6 *)sockaddr;
371 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
372 np->np_port = ntohs(sock_in6->sin6_port);
373 } else {
374 sock_in = (struct sockaddr_in *)sockaddr;
375 sprintf(np->np_ip, "%s", ip_str);
376 np->np_port = ntohs(sock_in->sin_port);
377 }
378
379 np->np_network_transport = network_transport;
380 spin_lock_init(&np->np_thread_lock);
381 init_completion(&np->np_restart_comp);
382 INIT_LIST_HEAD(&np->np_list);
383
384 ret = iscsi_target_setup_login_socket(np, sockaddr);
385 if (ret != 0) {
386 kfree(np);
85c3c54b 387 mutex_unlock(&np_lock);
e48354ce
NB		 388 return ERR_PTR(ret);
389 }
390
391 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
392 if (IS_ERR(np->np_thread)) {
393 pr_err("Unable to create kthread: iscsi_np\n");
394 ret = PTR_ERR(np->np_thread);
395 kfree(np);
85c3c54b 396 mutex_unlock(&np_lock);
e48354ce
NB		 397 return ERR_PTR(ret);
398 }
399 /*
400 * Increment the np_exports reference count now to prevent
401 * iscsit_del_np() below from being run while a new call to
402 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
403 * active. We don't need to hold np->np_thread_lock at this
404 * point because iscsi_np has not been added to g_np_list yet.
405 */
406 np->np_exports = 1;
85c3c54b 407 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 408
e48354ce 409 list_add_tail(&np->np_list, &g_np_list);
85c3c54b 410 mutex_unlock(&np_lock);
e48354ce
NB		 411
412 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 413 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 414
415 return np;
416}
417
418int iscsit_reset_np_thread(
419 struct iscsi_np *np,
420 struct iscsi_tpg_np *tpg_np,
421 struct iscsi_portal_group *tpg)
422{
423 spin_lock_bh(&np->np_thread_lock);
424 if (tpg && tpg_np) {
425 /*
426 * The reset operation need only be performed when the
427 * passed struct iscsi_portal_group has a login in progress
428 * to one of the network portals.
429 */
430 if (tpg_np->tpg_np->np_login_tpg != tpg) {
431 spin_unlock_bh(&np->np_thread_lock);
432 return 0;
433 }
434 }
435 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
436 spin_unlock_bh(&np->np_thread_lock);
437 return 0;
438 }
439 np->np_thread_state = ISCSI_NP_THREAD_RESET;
440
441 if (np->np_thread) {
442 spin_unlock_bh(&np->np_thread_lock);
443 send_sig(SIGINT, np->np_thread, 1);
444 wait_for_completion(&np->np_restart_comp);
445 spin_lock_bh(&np->np_thread_lock);
446 }
447 spin_unlock_bh(&np->np_thread_lock);
448
449 return 0;
450}
451
baa4d64b 452static void iscsit_free_np(struct iscsi_np *np)
e48354ce 453{
bf6932f4
AV		 454 if (np->np_socket)
455 sock_release(np->np_socket);
e48354ce
NB		 456}
457
458int iscsit_del_np(struct iscsi_np *np)
459{
460 spin_lock_bh(&np->np_thread_lock);
461 np->np_exports--;
462 if (np->np_exports) {
463 spin_unlock_bh(&np->np_thread_lock);
464 return 0;
465 }
466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
467 spin_unlock_bh(&np->np_thread_lock);
468
469 if (np->np_thread) {
470 /*
471 * We need to send the signal to wakeup Linux/Net
472 * which may be sleeping in sock_accept()..
473 */
474 send_sig(SIGINT, np->np_thread, 1);
475 kthread_stop(np->np_thread);
476 }
baa4d64b
NB		 477
478 np->np_transport->iscsit_free_np(np);
e48354ce 479
85c3c54b 480 mutex_lock(&np_lock);
e48354ce 481 list_del(&np->np_list);
85c3c54b 482 mutex_unlock(&np_lock);
e48354ce
NB		 483
484 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 485 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 486
baa4d64b 487 iscsit_put_transport(np->np_transport);
e48354ce
NB		 488 kfree(np);
489 return 0;
490}
491
2ec5a8c1
NB		 492static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
493static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494
495static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
496{
497 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
498 return 0;
499}
500
baa4d64b
NB		 501static struct iscsit_transport iscsi_target_transport = {
502 .name = "iSCSI/TCP",
503 .transport_type = ISCSI_TCP,
504 .owner = NULL,
505 .iscsit_setup_np = iscsit_setup_np,
506 .iscsit_accept_np = iscsit_accept_np,
507 .iscsit_free_np = iscsit_free_np,
cdb72665 508 .iscsit_alloc_cmd = iscsit_alloc_cmd,
baa4d64b
NB		 509 .iscsit_get_login_rx = iscsit_get_login_rx,
510 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 511 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 512 .iscsit_immediate_queue = iscsit_immediate_queue,
513 .iscsit_response_queue = iscsit_response_queue,
514 .iscsit_queue_data_in = iscsit_queue_rsp,
515 .iscsit_queue_status = iscsit_queue_rsp,
baa4d64b
NB		 516};
517
e48354ce
NB		 518static int __init iscsi_target_init_module(void)
519{
520 int ret = 0;
521
522 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
523
524 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
525 if (!iscsit_global) {
526 pr_err("Unable to allocate memory for iscsit_global\n");
527 return -1;
528 }
529 mutex_init(&auth_id_lock);
530 spin_lock_init(&sess_idr_lock);
531 idr_init(&tiqn_idr);
532 idr_init(&sess_idr);
533
534 ret = iscsi_target_register_configfs();
535 if (ret < 0)
536 goto out;
537
538 ret = iscsi_thread_set_init();
539 if (ret < 0)
540 goto configfs_out;
541
542 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
543 TARGET_THREAD_SET_COUNT) {
544 pr_err("iscsi_allocate_thread_sets() returned"
545 " unexpected value!\n");
546 goto ts_out1;
547 }
548
549 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
550 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
551 0, NULL);
552 if (!lio_cmd_cache) {
553 pr_err("Unable to kmem_cache_create() for"
554 " lio_cmd_cache\n");
555 goto ts_out2;
556 }
557
558 lio_qr_cache = kmem_cache_create("lio_qr_cache",
559 sizeof(struct iscsi_queue_req),
560 __alignof__(struct iscsi_queue_req), 0, NULL);
561 if (!lio_qr_cache) {
562 pr_err("nable to kmem_cache_create() for"
563 " lio_qr_cache\n");
564 goto cmd_out;
565 }
566
567 lio_dr_cache = kmem_cache_create("lio_dr_cache",
568 sizeof(struct iscsi_datain_req),
569 __alignof__(struct iscsi_datain_req), 0, NULL);
570 if (!lio_dr_cache) {
571 pr_err("Unable to kmem_cache_create() for"
572 " lio_dr_cache\n");
573 goto qr_out;
574 }
575
576 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
577 sizeof(struct iscsi_ooo_cmdsn),
578 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
579 if (!lio_ooo_cache) {
580 pr_err("Unable to kmem_cache_create() for"
581 " lio_ooo_cache\n");
582 goto dr_out;
583 }
584
585 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
586 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
587 0, NULL);
588 if (!lio_r2t_cache) {
589 pr_err("Unable to kmem_cache_create() for"
590 " lio_r2t_cache\n");
591 goto ooo_out;
592 }
593
baa4d64b
NB		 594 iscsit_register_transport(&iscsi_target_transport);
595
e48354ce
NB		 596 if (iscsit_load_discovery_tpg() < 0)
597 goto r2t_out;
598
599 return ret;
600r2t_out:
601 kmem_cache_destroy(lio_r2t_cache);
602ooo_out:
603 kmem_cache_destroy(lio_ooo_cache);
604dr_out:
605 kmem_cache_destroy(lio_dr_cache);
606qr_out:
607 kmem_cache_destroy(lio_qr_cache);
608cmd_out:
609 kmem_cache_destroy(lio_cmd_cache);
610ts_out2:
611 iscsi_deallocate_thread_sets();
612ts_out1:
613 iscsi_thread_set_free();
614configfs_out:
615 iscsi_target_deregister_configfs();
616out:
617 kfree(iscsit_global);
618 return -ENOMEM;
619}
620
621static void __exit iscsi_target_cleanup_module(void)
622{
623 iscsi_deallocate_thread_sets();
624 iscsi_thread_set_free();
625 iscsit_release_discovery_tpg();
baa4d64b 626 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 627 kmem_cache_destroy(lio_cmd_cache);
628 kmem_cache_destroy(lio_qr_cache);
629 kmem_cache_destroy(lio_dr_cache);
630 kmem_cache_destroy(lio_ooo_cache);
631 kmem_cache_destroy(lio_r2t_cache);
632
633 iscsi_target_deregister_configfs();
634
635 kfree(iscsit_global);
636}
637
8b1e1244 638static int iscsit_add_reject(
1aa58ccd 639 struct iscsi_conn *conn,
e48354ce 640 u8 reason,
1aa58ccd 641 unsigned char *buf)
e48354ce
NB		 642{
643 struct iscsi_cmd *cmd;
e48354ce
NB		 644
645 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
646 if (!cmd)
647 return -1;
648
649 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 650 cmd->reject_reason = reason;
e48354ce 651
1c3d5794 652 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 653 if (!cmd->buf_ptr) {
654 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 655 iscsit_free_cmd(cmd, false);
e48354ce
NB		 656 return -1;
657 }
e48354ce
NB		 658
659 spin_lock_bh(&conn->cmd_lock);
2fbb471e 660 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 661 spin_unlock_bh(&conn->cmd_lock);
662
663 cmd->i_state = ISTATE_SEND_REJECT;
664 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
665
1aa58ccd 666 return -1;
e48354ce
NB		 667}
668
1aa58ccd
NB		 669static int iscsit_add_reject_from_cmd(
670 struct iscsi_cmd *cmd,
e48354ce 671 u8 reason,
1aa58ccd
NB		 672 bool add_to_conn,
673 unsigned char *buf)
e48354ce
NB		 674{
675 struct iscsi_conn *conn;
e48354ce
NB		 676
677 if (!cmd->conn) {
678 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
679 cmd->init_task_tag);
680 return -1;
681 }
682 conn = cmd->conn;
683
684 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 685 cmd->reject_reason = reason;
e48354ce 686
1c3d5794 687 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 688 if (!cmd->buf_ptr) {
689 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 690 iscsit_free_cmd(cmd, false);
e48354ce
NB		 691 return -1;
692 }
e48354ce
NB		 693
694 if (add_to_conn) {
695 spin_lock_bh(&conn->cmd_lock);
2fbb471e 696 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 697 spin_unlock_bh(&conn->cmd_lock);
698 }
699
700 cmd->i_state = ISTATE_SEND_REJECT;
701 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 702 /*
703 * Perform the kref_put now if se_cmd has already been setup by
704 * scsit_setup_scsi_cmd()
705 */
706 if (cmd->se_cmd.se_tfo != NULL) {
707 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
708 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
709 }
1aa58ccd
NB		 710 return -1;
711}
712
713static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
714 unsigned char *buf)
715{
716 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
717}
e48354ce 718
1aa58ccd
NB		 719int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
720{
721 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 722}
723
724/*
725 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 726 * kernel sockets to copy data in/out.
e48354ce
NB		 727 */
728static int iscsit_map_iovec(
729 struct iscsi_cmd *cmd,
730 struct kvec *iov,
731 u32 data_offset,
732 u32 data_length)
733{
734 u32 i = 0;
735 struct scatterlist *sg;
736 unsigned int page_off;
737
738 /*
bfb79eac 739 * We know each entry in t_data_sg contains a page.
e48354ce 740 */
bfb79eac 741 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 742 page_off = (data_offset % PAGE_SIZE);
743
744 cmd->first_data_sg = sg;
745 cmd->first_data_sg_off = page_off;
746
747 while (data_length) {
748 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
749
750 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
751 iov[i].iov_len = cur_len;
752
753 data_length -= cur_len;
754 page_off = 0;
755 sg = sg_next(sg);
756 i++;
757 }
758
759 cmd->kmapped_nents = i;
760
761 return i;
762}
763
764static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
765{
766 u32 i;
767 struct scatterlist *sg;
768
769 sg = cmd->first_data_sg;
770
771 for (i = 0; i < cmd->kmapped_nents; i++)
772 kunmap(sg_page(&sg[i]));
773}
774
775static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
776{
777 struct iscsi_cmd *cmd;
778
779 conn->exp_statsn = exp_statsn;
780
3e1c81a9
NB		 781 if (conn->sess->sess_ops->RDMAExtensions)
782 return;
783
e48354ce 784 spin_lock_bh(&conn->cmd_lock);
2fbb471e 785 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 786 spin_lock(&cmd->istate_lock);
787 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 788 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 789 cmd->i_state = ISTATE_REMOVE;
790 spin_unlock(&cmd->istate_lock);
791 iscsit_add_cmd_to_immediate_queue(cmd, conn,
792 cmd->i_state);
793 continue;
794 }
795 spin_unlock(&cmd->istate_lock);
796 }
797 spin_unlock_bh(&conn->cmd_lock);
798}
799
800static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
801{
f80e8ed3 802 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 803
c0427f15 804 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 805
806 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
807 if (!cmd->iov_data) {
808 pr_err("Unable to allocate cmd->iov_data\n");
809 return -ENOMEM;
810 }
811
812 cmd->orig_iov_data_count = iov_count;
813 return 0;
814}
815
3e1c81a9
NB		 816int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
817 unsigned char *buf)
e48354ce 818{
3e1c81a9 819 int data_direction, payload_length;
e48354ce 820 struct iscsi_scsi_req *hdr;
d28b1169
AG		 821 int iscsi_task_attr;
822 int sam_task_attr;
e48354ce
NB		 823
824 spin_lock_bh(&conn->sess->session_stats_lock);
825 conn->sess->cmd_pdus++;
826 if (conn->sess->se_sess->se_node_acl) {
827 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
828 conn->sess->se_sess->se_node_acl->num_cmds++;
829 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
830 }
831 spin_unlock_bh(&conn->sess->session_stats_lock);
832
833 hdr = (struct iscsi_scsi_req *) buf;
834 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 835
836 /* FIXME; Add checks for AdditionalHeaderSegment */
837
838 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
839 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
840 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
841 " not set. Bad iSCSI Initiator.\n");
1aa58ccd
NB		 842 return iscsit_add_reject_cmd(cmd,
843 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 844 }
845
846 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
847 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
848 /*
42ea20ee
NB		 849 * From RFC-3720 Section 10.3.1:
850 *
851 * "Either or both of R and W MAY be 1 when either the
852 * Expected Data Transfer Length and/or Bidirectional Read
853 * Expected Data Transfer Length are 0"
854 *
855 * For this case, go ahead and clear the unnecssary bits
856 * to avoid any confusion with ->data_direction.
e48354ce 857 */
42ea20ee
NB		 858 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
859 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 860
42ea20ee 861 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 862 " set when Expected Data Transfer Length is 0 for"
42ea20ee 863 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 864 }
e48354ce
NB		 865
866 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
867 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
868 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
869 " MUST be set if Expected Data Transfer Length is not 0."
870 " Bad iSCSI Initiator\n");
1aa58ccd
NB		 871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 873 }
874
875 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
876 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
877 pr_err("Bidirectional operations not supported!\n");
1aa58ccd
NB		 878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 880 }
881
882 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
883 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
884 " Scsi Command PDU.\n");
1aa58ccd
NB		 885 return iscsit_add_reject_cmd(cmd,
886 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 887 }
888
889 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
890 pr_err("ImmediateData=No but DataSegmentLength=%u,"
891 " protocol error.\n", payload_length);
1aa58ccd
NB		 892 return iscsit_add_reject_cmd(cmd,
893 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 894 }
895
1aa58ccd 896 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 897 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
898 pr_err("Expected Data Transfer Length and Length of"
899 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
900 " bit is not set protocol error\n");
1aa58ccd
NB		 901 return iscsit_add_reject_cmd(cmd,
902 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 903 }
904
50e5c87d 905 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 906 pr_err("DataSegmentLength: %u is greater than"
907 " EDTL: %u, protocol error.\n", payload_length,
908 hdr->data_length);
1aa58ccd
NB		 909 return iscsit_add_reject_cmd(cmd,
910 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 911 }
912
21f5aa7e 913 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 914 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 915 " MaxXmitDataSegmentLength: %u, protocol error.\n",
916 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 917 return iscsit_add_reject_cmd(cmd,
918 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 919 }
920
921 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
922 pr_err("DataSegmentLength: %u is greater than"
923 " FirstBurstLength: %u, protocol error.\n",
924 payload_length, conn->sess->sess_ops->FirstBurstLength);
1aa58ccd
NB		 925 return iscsit_add_reject_cmd(cmd,
926 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 927 }
928
929 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
930 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
931 DMA_NONE;
932
d28b1169 933 cmd->data_direction = data_direction;
d28b1169
AG		 934 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
935 /*
936 * Figure out the SAM Task Attribute for the incoming SCSI CDB
937 */
938 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
939 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
940 sam_task_attr = MSG_SIMPLE_TAG;
941 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
942 sam_task_attr = MSG_ORDERED_TAG;
943 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
944 sam_task_attr = MSG_HEAD_TAG;
945 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
946 sam_task_attr = MSG_ACA_TAG;
947 else {
948 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
949 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
950 sam_task_attr = MSG_SIMPLE_TAG;
951 }
952
e48354ce
NB		 953 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
954 cmd->i_state = ISTATE_NEW_CMD;
955 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
956 cmd->immediate_data = (payload_length) ? 1 : 0;
957 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
958 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
959 if (cmd->unsolicited_data)
960 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
961
962 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
963 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
964 spin_lock_bh(&conn->sess->ttt_lock);
965 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
966 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
967 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
968 spin_unlock_bh(&conn->sess->ttt_lock);
969 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
970 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 971 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
972 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 973 cmd->first_burst_len = payload_length;
974
3e1c81a9
NB		 975 if (!conn->sess->sess_ops->RDMAExtensions &&
976 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 977 struct iscsi_datain_req *dr;
978
979 dr = iscsit_allocate_datain_req();
980 if (!dr)
1aa58ccd
NB		 981 return iscsit_add_reject_cmd(cmd,
982 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 983
984 iscsit_attach_datain_req(cmd, dr);
985 }
986
065ca1e4
AG		 987 /*
988 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
989 */
990 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 991 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
992 cmd->data_direction, sam_task_attr,
993 cmd->sense_buffer + 2);
065ca1e4
AG		 994
995 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
996 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 997 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
998 conn->cid);
999
1000 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 1001
de103c93
CH		 1002 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1003 scsilun_to_int(&hdr->lun));
1004 if (cmd->sense_reason)
1005 goto attach_cmd;
1006
1007 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1008 if (cmd->sense_reason) {
1009 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1aa58ccd
NB		 1010 return iscsit_add_reject_cmd(cmd,
1011 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1012 }
de103c93 1013
e48354ce
NB		 1014 goto attach_cmd;
1015 }
a12f41f8 1016
de103c93 1017 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1aa58ccd
NB		 1018 return iscsit_add_reject_cmd(cmd,
1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1020 }
1021
1022attach_cmd:
1023 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1024 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1025 spin_unlock_bh(&conn->cmd_lock);
1026 /*
1027 * Check if we need to delay processing because of ALUA
1028 * Active/NonOptimized primary access state..
1029 */
1030 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1031
3e1c81a9
NB		 1032 return 0;
1033}
1034EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1035
3e1c81a9
NB		 1036void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1037{
1038 iscsit_set_dataout_sequence_values(cmd);
1039
1040 spin_lock_bh(&cmd->dataout_timeout_lock);
1041 iscsit_start_dataout_timer(cmd, cmd->conn);
1042 spin_unlock_bh(&cmd->dataout_timeout_lock);
1043}
1044EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1045
1046int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1047 struct iscsi_scsi_req *hdr)
1048{
1049 int cmdsn_ret = 0;
e48354ce
NB		 1050 /*
1051 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1052 * the Immediate Bit is not set, and no Immediate
1053 * Data is attached.
1054 *
1055 * A PDU/CmdSN carrying Immediate Data can only
1056 * be processed after the DataCRC has passed.
1057 * If the DataCRC fails, the CmdSN MUST NOT
1058 * be acknowledged. (See below)
1059 */
1060 if (!cmd->immediate_data) {
adb97c29
NB		 1061 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1062 (unsigned char *)hdr, hdr->cmdsn);
1063 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1064 return -1;
1065 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1066 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1067 return 0;
3e1c81a9 1068 }
e48354ce
NB		 1069 }
1070
50e5c87d 1071 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1072
1073 /*
1074 * If no Immediate Data is attached, it's OK to return now.
1075 */
1076 if (!cmd->immediate_data) {
3e1c81a9
NB		 1077 if (!cmd->sense_reason && cmd->unsolicited_data)
1078 iscsit_set_unsoliticed_dataout(cmd);
1079 if (!cmd->sense_reason)
1080 return 0;
e48354ce 1081
3e1c81a9 1082 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1083 return 0;
1084 }
1085
1086 /*
3e1c81a9
NB		 1087 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1088 * execution. These exceptions are processed in CmdSN order using
1089 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1090 */
de103c93 1091 if (cmd->sense_reason) {
adb97c29
NB		 1092 if (cmd->reject_reason)
1093 return 0;
1094
3e1c81a9 1095 return 1;
e48354ce
NB		 1096 }
1097 /*
1098 * Call directly into transport_generic_new_cmd() to perform
1099 * the backend memory allocation.
1100 */
de103c93 1101 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
adb97c29 1102 if (cmd->sense_reason)
3e1c81a9 1103 return 1;
e48354ce 1104
3e1c81a9
NB		 1105 return 0;
1106}
1107EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1108
1109static int
1110iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1111 bool dump_payload)
1112{
adb97c29 1113 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1114 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1115 /*
1116 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1117 */
1118 if (dump_payload == true)
1119 goto after_immediate_data;
1120
1121 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1122 cmd->first_burst_len);
e48354ce
NB		 1123after_immediate_data:
1124 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1125 /*
1126 * A PDU/CmdSN carrying Immediate Data passed
1127 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1128 * Immediate Bit is not set.
1129 */
adb97c29
NB		 1130 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1131 (unsigned char *)hdr, hdr->cmdsn);
ce799c71 1132 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
adb97c29 1133 return -1;
3e1c81a9 1134
ce799c71 1135 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
adb97c29
NB		 1136 int rc;
1137
1138 rc = iscsit_dump_data_payload(cmd->conn,
1139 cmd->first_burst_len, 1);
1140 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1141 return rc;
3e1c81a9
NB		 1142 } else if (cmd->unsolicited_data)
1143 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1144
e48354ce
NB		 1145 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1146 /*
1147 * Immediate Data failed DataCRC and ERL>=1,
1148 * silently drop this PDU and let the initiator
1149 * plug the CmdSN gap.
1150 *
1151 * FIXME: Send Unsolicited NOPIN with reserved
1152 * TTT here to help the initiator figure out
1153 * the missing CmdSN, although they should be
1154 * intelligent enough to determine the missing
1155 * CmdSN and issue a retry to plug the sequence.
1156 */
1157 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1158 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1159 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1160 return -1;
1161
1162 return 0;
1163}
1164
3e1c81a9
NB		 1165static int
1166iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1167 unsigned char *buf)
1168{
1169 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1170 int rc, immed_data;
1171 bool dump_payload = false;
1172
1173 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1174 if (rc < 0)
adb97c29 1175 return 0;
3e1c81a9
NB		 1176 /*
1177 * Allocation iovecs needed for struct socket operations for
1178 * traditional iSCSI block I/O.
1179 */
1180 if (iscsit_allocate_iovecs(cmd) < 0) {
1aa58ccd
NB		 1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1183 }
1184 immed_data = cmd->immediate_data;
1185
1186 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1187 if (rc < 0)
1188 return rc;
1189 else if (rc > 0)
1190 dump_payload = true;
1191
1192 if (!immed_data)
1193 return 0;
1194
1195 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1196}
1197
e48354ce
NB		 1198static u32 iscsit_do_crypto_hash_sg(
1199 struct hash_desc *hash,
1200 struct iscsi_cmd *cmd,
1201 u32 data_offset,
1202 u32 data_length,
1203 u32 padding,
1204 u8 *pad_bytes)
1205{
1206 u32 data_crc;
1207 u32 i;
1208 struct scatterlist *sg;
1209 unsigned int page_off;
1210
1211 crypto_hash_init(hash);
1212
1213 sg = cmd->first_data_sg;
1214 page_off = cmd->first_data_sg_off;
1215
1216 i = 0;
1217 while (data_length) {
1218 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1219
1220 crypto_hash_update(hash, &sg[i], cur_len);
1221
1222 data_length -= cur_len;
1223 page_off = 0;
1224 i++;
1225 }
1226
1227 if (padding) {
1228 struct scatterlist pad_sg;
1229
1230 sg_init_one(&pad_sg, pad_bytes, padding);
1231 crypto_hash_update(hash, &pad_sg, padding);
1232 }
1233 crypto_hash_final(hash, (u8 *) &data_crc);
1234
1235 return data_crc;
1236}
1237
1238static void iscsit_do_crypto_hash_buf(
1239 struct hash_desc *hash,
80690fdb 1240 const void *buf,
e48354ce
NB		 1241 u32 payload_length,
1242 u32 padding,
1243 u8 *pad_bytes,
1244 u8 *data_crc)
1245{
1246 struct scatterlist sg;
1247
1248 crypto_hash_init(hash);
1249
8359cf43 1250 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1251 crypto_hash_update(hash, &sg, payload_length);
1252
1253 if (padding) {
1254 sg_init_one(&sg, pad_bytes, padding);
1255 crypto_hash_update(hash, &sg, padding);
1256 }
1257 crypto_hash_final(hash, data_crc);
1258}
1259
3e1c81a9
NB		 1260int
1261iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1262 struct iscsi_cmd **out_cmd)
e48354ce 1263{
3e1c81a9 1264 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1265 struct iscsi_cmd *cmd = NULL;
1266 struct se_cmd *se_cmd;
e48354ce 1267 unsigned long flags;
3e1c81a9
NB		 1268 u32 payload_length = ntoh24(hdr->dlength);
1269 int rc;
e48354ce
NB		 1270
1271 if (!payload_length) {
1272 pr_err("DataOUT payload is ZERO, protocol error.\n");
1aa58ccd
NB		 1273 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1274 buf);
e48354ce
NB		 1275 }
1276
1277 /* iSCSI write */
1278 spin_lock_bh(&conn->sess->session_stats_lock);
1279 conn->sess->rx_data_octets += payload_length;
1280 if (conn->sess->se_sess->se_node_acl) {
1281 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1282 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1283 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1284 }
1285 spin_unlock_bh(&conn->sess->session_stats_lock);
1286
21f5aa7e 1287 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1288 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1289 " MaxXmitDataSegmentLength: %u\n", payload_length,
1290 conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 1291 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1292 buf);
e48354ce
NB		 1293 }
1294
1295 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1296 payload_length);
1297 if (!cmd)
1298 return 0;
1299
1300 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1301 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1302 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1303 payload_length, conn->cid);
1304
1305 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1306 pr_err("Command ITT: 0x%08x received DataOUT after"
1307 " last DataOUT received, dumping payload\n",
1308 cmd->init_task_tag);
1309 return iscsit_dump_data_payload(conn, payload_length, 1);
1310 }
1311
1312 if (cmd->data_direction != DMA_TO_DEVICE) {
1313 pr_err("Command ITT: 0x%08x received DataOUT for a"
1314 " NON-WRITE command.\n", cmd->init_task_tag);
1aa58ccd 1315 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1316 }
1317 se_cmd = &cmd->se_cmd;
1318 iscsit_mod_dataout_timer(cmd);
1319
50e5c87d 1320 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1321 pr_err("DataOut Offset: %u, Length %u greater than"
1322 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1323 hdr->offset, payload_length, cmd->se_cmd.data_length);
1aa58ccd 1324 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1325 }
1326
1327 if (cmd->unsolicited_data) {
1328 int dump_unsolicited_data = 0;
1329
1330 if (conn->sess->sess_ops->InitialR2T) {
1331 pr_err("Received unexpected unsolicited data"
1332 " while InitialR2T=Yes, protocol error.\n");
1333 transport_send_check_condition_and_sense(&cmd->se_cmd,
1334 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1335 return -1;
1336 }
1337 /*
1338 * Special case for dealing with Unsolicited DataOUT
1339 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1340 * failures;
1341 */
1342
1343 /* Something's amiss if we're not in WRITE_PENDING state... */
1344 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1345 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1346 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1347
1348 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
de103c93 1349 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce
NB		 1350 dump_unsolicited_data = 1;
1351 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1352
1353 if (dump_unsolicited_data) {
1354 /*
1355 * Check if a delayed TASK_ABORTED status needs to
1356 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1357 * received with the unsolicitied data out.
1358 */
1359 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1360 iscsit_stop_dataout_timer(cmd);
1361
1362 transport_check_aborted_status(se_cmd,
1363 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1364 return iscsit_dump_data_payload(conn, payload_length, 1);
1365 }
1366 } else {
1367 /*
1368 * For the normal solicited data path:
1369 *
1370 * Check for a delayed TASK_ABORTED status and dump any
1371 * incoming data out payload if one exists. Also, when the
1372 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1373 * data out sequence, we decrement outstanding_r2ts. Once
1374 * outstanding_r2ts reaches zero, go ahead and send the delayed
1375 * TASK_ABORTED status.
1376 */
7d680f3b 1377 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1378 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1379 if (--cmd->outstanding_r2ts < 1) {
1380 iscsit_stop_dataout_timer(cmd);
1381 transport_check_aborted_status(
1382 se_cmd, 1);
1383 }
1384
1385 return iscsit_dump_data_payload(conn, payload_length, 1);
1386 }
1387 }
1388 /*
1389 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1390 * within-command recovery checks before receiving the payload.
1391 */
3e1c81a9
NB		 1392 rc = iscsit_check_pre_dataout(cmd, buf);
1393 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1394 return 0;
3e1c81a9 1395 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1396 return -1;
1397
3e1c81a9
NB		 1398 *out_cmd = cmd;
1399 return 0;
1400}
1401EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1402
1403static int
1404iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1405 struct iscsi_data *hdr)
1406{
1407 struct kvec *iov;
1408 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1409 u32 payload_length = ntoh24(hdr->dlength);
1410 int iov_ret, data_crc_failed = 0;
1411
e48354ce
NB		 1412 rx_size += payload_length;
1413 iov = &cmd->iov_data[0];
1414
50e5c87d
CH		 1415 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1416 payload_length);
e48354ce
NB		 1417 if (iov_ret < 0)
1418 return -1;
1419
1420 iov_count += iov_ret;
1421
1422 padding = ((-payload_length) & 3);
1423 if (padding != 0) {
1424 iov[iov_count].iov_base = cmd->pad_bytes;
1425 iov[iov_count++].iov_len = padding;
1426 rx_size += padding;
1427 pr_debug("Receiving %u padding bytes.\n", padding);
1428 }
1429
1430 if (conn->conn_ops->DataDigest) {
1431 iov[iov_count].iov_base = &checksum;
1432 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1433 rx_size += ISCSI_CRC_LEN;
1434 }
1435
1436 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1437
1438 iscsit_unmap_iovec(cmd);
1439
1440 if (rx_got != rx_size)
1441 return -1;
1442
1443 if (conn->conn_ops->DataDigest) {
1444 u32 data_crc;
1445
1446 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1447 be32_to_cpu(hdr->offset),
1448 payload_length, padding,
e48354ce
NB		 1449 cmd->pad_bytes);
1450
1451 if (checksum != data_crc) {
1452 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1453 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1454 " does not match computed 0x%08x\n",
1455 hdr->itt, hdr->offset, payload_length,
1456 hdr->datasn, checksum, data_crc);
1457 data_crc_failed = 1;
1458 } else {
1459 pr_debug("Got CRC32C DataDigest 0x%08x for"
1460 " %u bytes of Data Out\n", checksum,
1461 payload_length);
1462 }
1463 }
3e1c81a9
NB		 1464
1465 return data_crc_failed;
1466}
1467
1468int
1469iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1470 bool data_crc_failed)
1471{
1472 struct iscsi_conn *conn = cmd->conn;
1473 int rc, ooo_cmdsn;
e48354ce
NB		 1474 /*
1475 * Increment post receive data and CRC values or perform
1476 * within-command recovery.
1477 */
3e1c81a9
NB		 1478 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1479 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1480 return 0;
3e1c81a9 1481 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1482 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1483 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1484 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1485 /*
1486 * Handle extra special case for out of order
1487 * Unsolicited Data Out.
1488 */
1489 spin_lock_bh(&cmd->istate_lock);
1490 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1491 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1492 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1493 spin_unlock_bh(&cmd->istate_lock);
1494
1495 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1496 if (ooo_cmdsn)
1497 return 0;
1498 target_execute_cmd(&cmd->se_cmd);
1499 return 0;
e48354ce
NB		 1500 } else /* DATAOUT_CANNOT_RECOVER */
1501 return -1;
1502
1503 return 0;
1504}
3e1c81a9 1505EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1506
3e1c81a9
NB		 1507static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1508{
1509 struct iscsi_cmd *cmd;
1510 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1511 int rc;
1512 bool data_crc_failed = false;
1513
1514 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1515 if (rc < 0)
adb97c29 1516 return 0;
3e1c81a9
NB		 1517 else if (!cmd)
1518 return 0;
1519
1520 rc = iscsit_get_dataout(conn, cmd, hdr);
1521 if (rc < 0)
1522 return rc;
1523 else if (rc > 0)
1524 data_crc_failed = true;
1525
1526 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1527}
1528
1529int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1530 unsigned char *buf)
e48354ce
NB		 1531{
1532 unsigned char *ping_data = NULL;
1533 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1534 u32 checksum, data_crc, padding = 0, payload_length;
3e1c81a9 1535 struct iscsi_cmd *cmd_p = NULL;
e48354ce
NB		 1536 struct kvec *iov = NULL;
1537 struct iscsi_nopout *hdr;
1538
1539 hdr = (struct iscsi_nopout *) buf;
1540 payload_length = ntoh24(hdr->dlength);
e48354ce 1541
66c7db68 1542 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1543 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1544 " not set, protocol error.\n");
382e9ff1
NB		 1545 if (!cmd)
1546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1547 (unsigned char *)hdr);
1548
1aa58ccd
NB		 1549 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1550 (unsigned char *)hdr);
e48354ce
NB		 1551 }
1552
21f5aa7e 1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1554 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1555 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1556 " error.\n", payload_length,
21f5aa7e 1557 conn->conn_ops->MaxXmitDataSegmentLength);
382e9ff1
NB		 1558 if (!cmd)
1559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1560 (unsigned char *)hdr);
1561
1aa58ccd
NB		 1562 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1563 (unsigned char *)hdr);
e48354ce
NB		 1564 }
1565
3e1c81a9 1566 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1567 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1568 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1569 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1570 payload_length);
1571 /*
1572 * This is not a response to a Unsolicited NopIN, which means
1573 * it can either be a NOPOUT ping request (with a valid ITT),
1574 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1575 * Either way, make sure we allocate an struct iscsi_cmd, as both
1576 * can contain ping data.
1577 */
50e5c87d 1578 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce 1579 if (!cmd)
1aa58ccd 1580 return iscsit_reject_cmd(cmd,
e48354ce 1581 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1aa58ccd 1582 (unsigned char *)hdr);
e48354ce
NB		 1583
1584 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1585 cmd->i_state = ISTATE_SEND_NOPIN;
1586 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1587 1 : 0);
1588 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1589 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1590 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1591 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1592 cmd->data_direction = DMA_NONE;
1593 }
1594
50e5c87d 1595 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1596 rx_size = payload_length;
1597 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1598 if (!ping_data) {
1599 pr_err("Unable to allocate memory for"
1600 " NOPOUT ping data.\n");
1601 ret = -1;
1602 goto out;
1603 }
1604
1605 iov = &cmd->iov_misc[0];
1606 iov[niov].iov_base = ping_data;
1607 iov[niov++].iov_len = payload_length;
1608
1609 padding = ((-payload_length) & 3);
1610 if (padding != 0) {
1611 pr_debug("Receiving %u additional bytes"
1612 " for padding.\n", padding);
1613 iov[niov].iov_base = &cmd->pad_bytes;
1614 iov[niov++].iov_len = padding;
1615 rx_size += padding;
1616 }
1617 if (conn->conn_ops->DataDigest) {
1618 iov[niov].iov_base = &checksum;
1619 iov[niov++].iov_len = ISCSI_CRC_LEN;
1620 rx_size += ISCSI_CRC_LEN;
1621 }
1622
1623 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1624 if (rx_got != rx_size) {
1625 ret = -1;
1626 goto out;
1627 }
1628
1629 if (conn->conn_ops->DataDigest) {
1630 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1631 ping_data, payload_length,
1632 padding, cmd->pad_bytes,
1633 (u8 *)&data_crc);
1634
1635 if (checksum != data_crc) {
1636 pr_err("Ping data CRC32C DataDigest"
1637 " 0x%08x does not match computed 0x%08x\n",
1638 checksum, data_crc);
1639 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1640 pr_err("Unable to recover from"
1641 " NOPOUT Ping DataCRC failure while in"
1642 " ERL=0.\n");
1643 ret = -1;
1644 goto out;
1645 } else {
1646 /*
1647 * Silently drop this PDU and let the
1648 * initiator plug the CmdSN gap.
1649 */
1650 pr_debug("Dropping NOPOUT"
1651 " Command CmdSN: 0x%08x due to"
1652 " DataCRC error.\n", hdr->cmdsn);
1653 ret = 0;
1654 goto out;
1655 }
1656 } else {
1657 pr_debug("Got CRC32C DataDigest"
1658 " 0x%08x for %u bytes of ping data.\n",
1659 checksum, payload_length);
1660 }
1661 }
1662
1663 ping_data[payload_length] = '\0';
1664 /*
1665 * Attach ping data to struct iscsi_cmd->buf_ptr.
1666 */
8359cf43 1667 cmd->buf_ptr = ping_data;
e48354ce
NB		 1668 cmd->buf_ptr_size = payload_length;
1669
1670 pr_debug("Got %u bytes of NOPOUT ping"
1671 " data.\n", payload_length);
1672 pr_debug("Ping Data: \"%s\"\n", ping_data);
1673 }
1674
66c7db68 1675 if (hdr->itt != RESERVED_ITT) {
e48354ce
NB		 1676 if (!cmd) {
1677 pr_err("Checking CmdSN for NOPOUT,"
1678 " but cmd is NULL!\n");
1679 return -1;
1680 }
1681 /*
1682 * Initiator is expecting a NopIN ping reply,
1683 */
1684 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1685 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1686 spin_unlock_bh(&conn->cmd_lock);
1687
50e5c87d 1688 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1689
1690 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1691 iscsit_add_cmd_to_response_queue(cmd, conn,
1692 cmd->i_state);
1693 return 0;
1694 }
1695
adb97c29
NB		 1696 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1697 (unsigned char *)hdr, hdr->cmdsn);
e48354ce
NB		 1698 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1699 ret = 0;
1700 goto ping_out;
1701 }
1702 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1703 return -1;
e48354ce
NB		 1704
1705 return 0;
1706 }
1707
50e5c87d 1708 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1709 /*
1710 * This was a response to a unsolicited NOPIN ping.
1711 */
3e1c81a9
NB		 1712 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1713 if (!cmd_p)
e48354ce
NB		 1714 return -1;
1715
1716 iscsit_stop_nopin_response_timer(conn);
1717
3e1c81a9
NB		 1718 cmd_p->i_state = ISTATE_REMOVE;
1719 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
e48354ce
NB		 1720 iscsit_start_nopin_timer(conn);
1721 } else {
1722 /*
1723 * Initiator is not expecting a NOPIN is response.
1724 * Just ignore for now.
1725 *
1726 * iSCSI v19-91 10.18
1727 * "A NOP-OUT may also be used to confirm a changed
1728 * ExpStatSN if another PDU will not be available
1729 * for a long time."
1730 */
1731 ret = 0;
1732 goto out;
1733 }
1734
1735 return 0;
1736out:
1737 if (cmd)
aafc9d15 1738 iscsit_free_cmd(cmd, false);
e48354ce
NB		 1739ping_out:
1740 kfree(ping_data);
1741 return ret;
1742}
3e1c81a9 1743EXPORT_SYMBOL(iscsit_handle_nop_out);
e48354ce 1744
3e1c81a9
NB		 1745int
1746iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1747 unsigned char *buf)
e48354ce 1748{
e48354ce
NB		 1749 struct se_tmr_req *se_tmr;
1750 struct iscsi_tmr_req *tmr_req;
1751 struct iscsi_tm *hdr;
c6ccbb9b
NB		 1752 int out_of_order_cmdsn = 0, ret;
1753 bool sess_ref = false;
e48354ce
NB		 1754 u8 function;
1755
1756 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1757 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1758 function = hdr->flags;
1759
1760 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1761 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1762 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1763 hdr->rtt, hdr->refcmdsn, conn->cid);
1764
1765 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1766 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1767 hdr->rtt != RESERVED_ITT)) {
e48354ce 1768 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1769 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1770 }
1771
1772 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1774 pr_err("Task Management Request TASK_REASSIGN not"
1775 " issued as immediate command, bad iSCSI Initiator"
1776 "implementation\n");
1aa58ccd
NB		 1777 return iscsit_add_reject_cmd(cmd,
1778 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1779 }
1780 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1781 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1782 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1783
d28b1169
AG		 1784 cmd->data_direction = DMA_NONE;
1785
1786 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1787 if (!cmd->tmr_req) {
1788 pr_err("Unable to allocate memory for"
1789 " Task Management command!\n");
1aa58ccd
NB		 1790 return iscsit_add_reject_cmd(cmd,
1791 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1792 buf);
d28b1169
AG		 1793 }
1794
1795 /*
1796 * TASK_REASSIGN for ERL=2 / connection stays inside of
1797 * LIO-Target $FABRIC_MOD
1798 */
1799 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1800
1801 u8 tcm_function;
1802 int ret;
1803
1804 transport_init_se_cmd(&cmd->se_cmd,
1805 &lio_target_fabric_configfs->tf_ops,
1806 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1807 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1808
c6ccbb9b
NB		 1809 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1810 sess_ref = true;
1811
d28b1169
AG		 1812 switch (function) {
1813 case ISCSI_TM_FUNC_ABORT_TASK:
1814 tcm_function = TMR_ABORT_TASK;
1815 break;
1816 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1817 tcm_function = TMR_ABORT_TASK_SET;
1818 break;
1819 case ISCSI_TM_FUNC_CLEAR_ACA:
1820 tcm_function = TMR_CLEAR_ACA;
1821 break;
1822 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1823 tcm_function = TMR_CLEAR_TASK_SET;
1824 break;
1825 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1826 tcm_function = TMR_LUN_RESET;
1827 break;
1828 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1829 tcm_function = TMR_TARGET_WARM_RESET;
1830 break;
1831 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1832 tcm_function = TMR_TARGET_COLD_RESET;
1833 break;
1834 default:
1835 pr_err("Unknown iSCSI TMR Function:"
1836 " 0x%02x\n", function);
1aa58ccd
NB		 1837 return iscsit_add_reject_cmd(cmd,
1838 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1839 }
1840
1841 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1842 tcm_function, GFP_KERNEL);
1843 if (ret < 0)
1aa58ccd
NB		 1844 return iscsit_add_reject_cmd(cmd,
1845 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1846
1847 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1848 }
e48354ce
NB		 1849
1850 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1851 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1852 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1853 cmd->init_task_tag = hdr->itt;
1854 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1855 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1856 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1857 se_tmr = cmd->se_cmd.se_tmr_req;
1858 tmr_req = cmd->tmr_req;
1859 /*
1860 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1861 */
1862 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1863 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1864 scsilun_to_int(&hdr->lun));
e48354ce 1865 if (ret < 0) {
e48354ce
NB		 1866 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1867 goto attach;
1868 }
1869 }
1870
1871 switch (function) {
1872 case ISCSI_TM_FUNC_ABORT_TASK:
1873 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1874 if (se_tmr->response)
e48354ce 1875 goto attach;
e48354ce
NB		 1876 break;
1877 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1878 case ISCSI_TM_FUNC_CLEAR_ACA:
1879 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1880 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1881 break;
1882 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1883 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1884 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1885 goto attach;
1886 }
1887 break;
1888 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1889 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1890 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1891 goto attach;
1892 }
1893 break;
1894 case ISCSI_TM_FUNC_TASK_REASSIGN:
1895 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1896 /*
1897 * Perform sanity checks on the ExpDataSN only if the
1898 * TASK_REASSIGN was successful.
1899 */
de103c93 1900 if (se_tmr->response)
e48354ce
NB		 1901 break;
1902
1903 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1aa58ccd
NB		 1904 return iscsit_add_reject_cmd(cmd,
1905 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1906 break;
1907 default:
1908 pr_err("Unknown TMR function: 0x%02x, protocol"
1909 " error.\n", function);
e48354ce
NB		 1910 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1911 goto attach;
1912 }
1913
1914 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1915 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1916 se_tmr->call_transport = 1;
1917attach:
1918 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1919 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1920 spin_unlock_bh(&conn->cmd_lock);
1921
1922 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29 1923 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1924 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1925 out_of_order_cmdsn = 1;
5a4c8666 1926 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1927 return 0;
5a4c8666 1928 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1929 return -1;
e48354ce 1930 }
50e5c87d 1931 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1932
5a4c8666 1933 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1934 return 0;
1935 /*
1936 * Found the referenced task, send to transport for processing.
1937 */
1938 if (se_tmr->call_transport)
1939 return transport_generic_handle_tmr(&cmd->se_cmd);
1940
1941 /*
1942 * Could not find the referenced LUN, task, or Task Management
1943 * command not authorized or supported. Change state and
1944 * let the tx_thread send the response.
1945 *
1946 * For connection recovery, this is also the default action for
1947 * TMR TASK_REASSIGN.
1948 */
c6ccbb9b
NB		 1949 if (sess_ref) {
1950 pr_debug("Handle TMR, using sess_ref=true check\n");
1951 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1952 }
1953
e48354ce
NB		 1954 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1955 return 0;
1956}
3e1c81a9 1957EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1958
1959/* #warning FIXME: Support Text Command parameters besides SendTargets */
1960static int iscsit_handle_text_cmd(
1961 struct iscsi_conn *conn,
1962 unsigned char *buf)
1963{
1964 char *text_ptr, *text_in;
1965 int cmdsn_ret, niov = 0, rx_got, rx_size;
1966 u32 checksum = 0, data_crc = 0, payload_length;
76f1928e 1967 u32 padding = 0, pad_bytes = 0, text_length = 0;
e48354ce
NB		 1968 struct iscsi_cmd *cmd;
1969 struct kvec iov[3];
1970 struct iscsi_text *hdr;
1971
1972 hdr = (struct iscsi_text *) buf;
1973 payload_length = ntoh24(hdr->dlength);
e48354ce 1974
21f5aa7e 1975 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1976 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1977 "greater than MaxXmitDataSegmentLength %u.\n",
1978 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd 1979 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1980 }
1981
1982 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1983 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1984 hdr->exp_statsn, payload_length);
1985
1986 rx_size = text_length = payload_length;
1987 if (text_length) {
1988 text_in = kzalloc(text_length, GFP_KERNEL);
1989 if (!text_in) {
1990 pr_err("Unable to allocate memory for"
1991 " incoming text parameters\n");
1992 return -1;
1993 }
1994
1995 memset(iov, 0, 3 * sizeof(struct kvec));
1996 iov[niov].iov_base = text_in;
1997 iov[niov++].iov_len = text_length;
1998
1999 padding = ((-payload_length) & 3);
2000 if (padding != 0) {
76f1928e 2001 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2002 iov[niov++].iov_len = padding;
2003 rx_size += padding;
2004 pr_debug("Receiving %u additional bytes"
2005 " for padding.\n", padding);
2006 }
2007 if (conn->conn_ops->DataDigest) {
2008 iov[niov].iov_base = &checksum;
2009 iov[niov++].iov_len = ISCSI_CRC_LEN;
2010 rx_size += ISCSI_CRC_LEN;
2011 }
2012
2013 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2014 if (rx_got != rx_size) {
2015 kfree(text_in);
2016 return -1;
2017 }
2018
2019 if (conn->conn_ops->DataDigest) {
2020 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2021 text_in, text_length,
76f1928e 2022 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2023 (u8 *)&data_crc);
2024
2025 if (checksum != data_crc) {
2026 pr_err("Text data CRC32C DataDigest"
2027 " 0x%08x does not match computed"
2028 " 0x%08x\n", checksum, data_crc);
2029 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2030 pr_err("Unable to recover from"
2031 " Text Data digest failure while in"
2032 " ERL=0.\n");
2033 kfree(text_in);
2034 return -1;
2035 } else {
2036 /*
2037 * Silently drop this PDU and let the
2038 * initiator plug the CmdSN gap.
2039 */
2040 pr_debug("Dropping Text"
2041 " Command CmdSN: 0x%08x due to"
2042 " DataCRC error.\n", hdr->cmdsn);
2043 kfree(text_in);
2044 return 0;
2045 }
2046 } else {
2047 pr_debug("Got CRC32C DataDigest"
2048 " 0x%08x for %u bytes of text data.\n",
2049 checksum, text_length);
2050 }
2051 }
2052 text_in[text_length - 1] = '\0';
2053 pr_debug("Successfully read %d bytes of text"
2054 " data.\n", text_length);
2055
2056 if (strncmp("SendTargets", text_in, 11) != 0) {
2057 pr_err("Received Text Data that is not"
2058 " SendTargets, cannot continue.\n");
2059 kfree(text_in);
2060 return -1;
2061 }
2062 text_ptr = strchr(text_in, '=');
2063 if (!text_ptr) {
2064 pr_err("No \"=\" separator found in Text Data,"
2065 " cannot continue.\n");
2066 kfree(text_in);
2067 return -1;
2068 }
2069 if (strncmp("=All", text_ptr, 4) != 0) {
2070 pr_err("Unable to locate All value for"
2071 " SendTargets key, cannot continue.\n");
2072 kfree(text_in);
2073 return -1;
2074 }
2075/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2076 kfree(text_in);
2077 }
2078
2079 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2080 if (!cmd)
1aa58ccd
NB		 2081 return iscsit_add_reject(conn,
2082 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 2083
2084 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2085 cmd->i_state = ISTATE_SEND_TEXTRSP;
2086 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2087 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2088 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2089 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2090 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2091 cmd->data_direction = DMA_NONE;
2092
2093 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2095 spin_unlock_bh(&conn->cmd_lock);
2096
50e5c87d 2097 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2098
2099 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29
NB		 2100 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2101 (unsigned char *)hdr, hdr->cmdsn);
e48354ce 2102 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 2103 return -1;
e48354ce
NB		 2104
2105 return 0;
2106 }
2107
2108 return iscsit_execute_cmd(cmd, 0);
2109}
2110
2111int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2112{
2113 struct iscsi_conn *conn_p;
2114 struct iscsi_session *sess = conn->sess;
2115
2116 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2117 " for SID: %u.\n", conn->cid, conn->sess->sid);
2118
2119 atomic_set(&sess->session_logout, 1);
2120 atomic_set(&conn->conn_logout_remove, 1);
2121 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2122
2123 iscsit_inc_conn_usage_count(conn);
2124 iscsit_inc_session_usage_count(sess);
2125
2126 spin_lock_bh(&sess->conn_lock);
2127 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2128 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2129 continue;
2130
2131 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2132 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2133 }
2134 spin_unlock_bh(&sess->conn_lock);
2135
2136 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2137
2138 return 0;
2139}
2140
2141int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2142{
2143 struct iscsi_conn *l_conn;
2144 struct iscsi_session *sess = conn->sess;
2145
2146 pr_debug("Received logout request CLOSECONNECTION for CID:"
2147 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2148
2149 /*
2150 * A Logout Request with a CLOSECONNECTION reason code for a CID
2151 * can arrive on a connection with a differing CID.
2152 */
2153 if (conn->cid == cmd->logout_cid) {
2154 spin_lock_bh(&conn->state_lock);
2155 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2156 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2157
2158 atomic_set(&conn->conn_logout_remove, 1);
2159 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2160 iscsit_inc_conn_usage_count(conn);
2161
2162 spin_unlock_bh(&conn->state_lock);
2163 } else {
2164 /*
2165 * Handle all different cid CLOSECONNECTION requests in
2166 * iscsit_logout_post_handler_diffcid() as to give enough
2167 * time for any non immediate command's CmdSN to be
2168 * acknowledged on the connection in question.
2169 *
2170 * Here we simply make sure the CID is still around.
2171 */
2172 l_conn = iscsit_get_conn_from_cid(sess,
2173 cmd->logout_cid);
2174 if (!l_conn) {
2175 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2176 iscsit_add_cmd_to_response_queue(cmd, conn,
2177 cmd->i_state);
2178 return 0;
2179 }
2180
2181 iscsit_dec_conn_usage_count(l_conn);
2182 }
2183
2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2185
2186 return 0;
2187}
2188
2189int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2190{
2191 struct iscsi_session *sess = conn->sess;
2192
2193 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2194 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2195
2196 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2197 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2198 " while ERL!=2.\n");
2199 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2200 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2201 return 0;
2202 }
2203
2204 if (conn->cid == cmd->logout_cid) {
2205 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2206 " with CID: %hu on CID: %hu, implementation error.\n",
2207 cmd->logout_cid, conn->cid);
2208 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2209 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2210 return 0;
2211 }
2212
2213 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2214
2215 return 0;
2216}
2217
3e1c81a9
NB		 2218int
2219iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2220 unsigned char *buf)
e48354ce
NB		 2221{
2222 int cmdsn_ret, logout_remove = 0;
2223 u8 reason_code = 0;
e48354ce
NB		 2224 struct iscsi_logout *hdr;
2225 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2226
2227 hdr = (struct iscsi_logout *) buf;
2228 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2229
2230 if (tiqn) {
2231 spin_lock(&tiqn->logout_stats.lock);
2232 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2233 tiqn->logout_stats.normal_logouts++;
2234 else
2235 tiqn->logout_stats.abnormal_logouts++;
2236 spin_unlock(&tiqn->logout_stats.lock);
2237 }
2238
2239 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2240 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2241 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2242 hdr->cid, conn->cid);
2243
2244 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2245 pr_err("Received logout request on connection that"
2246 " is not in logged in state, ignoring request.\n");
aafc9d15 2247 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2248 return 0;
2249 }
2250
e48354ce
NB		 2251 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2252 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2253 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2254 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2255 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2256 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2257 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2258 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2259 cmd->logout_reason = reason_code;
2260 cmd->data_direction = DMA_NONE;
2261
2262 /*
2263 * We need to sleep in these cases (by returning 1) until the Logout
2264 * Response gets sent in the tx thread.
2265 */
2266 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2267 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2268 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2269 logout_remove = 1;
2270
2271 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2272 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2273 spin_unlock_bh(&conn->cmd_lock);
2274
2275 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2276 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2277
2278 /*
2279 * Immediate commands are executed, well, immediately.
2280 * Non-Immediate Logout Commands are executed in CmdSN order.
2281 */
c6037cc5 2282 if (cmd->immediate_cmd) {
e48354ce
NB		 2283 int ret = iscsit_execute_cmd(cmd, 0);
2284
2285 if (ret < 0)
2286 return ret;
2287 } else {
adb97c29 2288 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1aa58ccd 2289 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2290 logout_remove = 0;
1aa58ccd
NB		 2291 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2292 return -1;
e48354ce
NB		 2293 }
2294
2295 return logout_remove;
2296}
3e1c81a9 2297EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2298
2299static int iscsit_handle_snack(
2300 struct iscsi_conn *conn,
2301 unsigned char *buf)
2302{
e48354ce
NB		 2303 struct iscsi_snack *hdr;
2304
2305 hdr = (struct iscsi_snack *) buf;
2306 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2307
2308 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2309 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2310 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2311 hdr->begrun, hdr->runlength, conn->cid);
2312
2313 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2314 pr_err("Initiator sent SNACK request while in"
2315 " ErrorRecoveryLevel=0.\n");
1aa58ccd
NB		 2316 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2317 buf);
e48354ce
NB		 2318 }
2319 /*
2320 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2321 * call from inside iscsi_send_recovery_datain_or_r2t().
2322 */
2323 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2324 case 0:
2325 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2326 hdr->itt,
2327 be32_to_cpu(hdr->ttt),
2328 be32_to_cpu(hdr->begrun),
2329 be32_to_cpu(hdr->runlength));
e48354ce 2330 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2331 return iscsit_handle_status_snack(conn, hdr->itt,
2332 be32_to_cpu(hdr->ttt),
2333 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2334 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2335 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2336 be32_to_cpu(hdr->begrun),
2337 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2338 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2339 /* FIXME: Support R-Data SNACK */
2340 pr_err("R-Data SNACK Not Supported.\n");
1aa58ccd
NB		 2341 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2342 buf);
e48354ce
NB		 2343 default:
2344 pr_err("Unknown SNACK type 0x%02x, protocol"
2345 " error.\n", hdr->flags & 0x0f);
1aa58ccd
NB		 2346 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2347 buf);
e48354ce
NB		 2348 }
2349
2350 return 0;
2351}
2352
2353static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2354{
2355 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2356 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2357 wait_for_completion_interruptible_timeout(
2358 &conn->rx_half_close_comp,
2359 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2360 }
2361}
2362
2363static int iscsit_handle_immediate_data(
2364 struct iscsi_cmd *cmd,
3e1c81a9 2365 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2366 u32 length)
2367{
2368 int iov_ret, rx_got = 0, rx_size = 0;
2369 u32 checksum, iov_count = 0, padding = 0;
2370 struct iscsi_conn *conn = cmd->conn;
2371 struct kvec *iov;
2372
2373 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2374 if (iov_ret < 0)
2375 return IMMEDIATE_DATA_CANNOT_RECOVER;
2376
2377 rx_size = length;
2378 iov_count = iov_ret;
2379 iov = &cmd->iov_data[0];
2380
2381 padding = ((-length) & 3);
2382 if (padding != 0) {
2383 iov[iov_count].iov_base = cmd->pad_bytes;
2384 iov[iov_count++].iov_len = padding;
2385 rx_size += padding;
2386 }
2387
2388 if (conn->conn_ops->DataDigest) {
2389 iov[iov_count].iov_base = &checksum;
2390 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2391 rx_size += ISCSI_CRC_LEN;
2392 }
2393
2394 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2395
2396 iscsit_unmap_iovec(cmd);
2397
2398 if (rx_got != rx_size) {
2399 iscsit_rx_thread_wait_for_tcp(conn);
2400 return IMMEDIATE_DATA_CANNOT_RECOVER;
2401 }
2402
2403 if (conn->conn_ops->DataDigest) {
2404 u32 data_crc;
2405
2406 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2407 cmd->write_data_done, length, padding,
2408 cmd->pad_bytes);
2409
2410 if (checksum != data_crc) {
2411 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2412 " does not match computed 0x%08x\n", checksum,
2413 data_crc);
2414
2415 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2416 pr_err("Unable to recover from"
2417 " Immediate Data digest failure while"
2418 " in ERL=0.\n");
1aa58ccd 2419 iscsit_reject_cmd(cmd,
e48354ce 2420 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2421 (unsigned char *)hdr);
e48354ce
NB		 2422 return IMMEDIATE_DATA_CANNOT_RECOVER;
2423 } else {
1aa58ccd 2424 iscsit_reject_cmd(cmd,
e48354ce 2425 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2426 (unsigned char *)hdr);
e48354ce
NB		 2427 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2428 }
2429 } else {
2430 pr_debug("Got CRC32C DataDigest 0x%08x for"
2431 " %u bytes of Immediate Data\n", checksum,
2432 length);
2433 }
2434 }
2435
2436 cmd->write_data_done += length;
2437
ebf1d95c 2438 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2439 spin_lock_bh(&cmd->istate_lock);
2440 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2441 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2442 spin_unlock_bh(&cmd->istate_lock);
2443 }
2444
2445 return IMMEDIATE_DATA_NORMAL_OPERATION;
2446}
2447
2448/*
2449 * Called with sess->conn_lock held.
2450 */
2451/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2452 with active network interface */
2453static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2454{
2455 struct iscsi_cmd *cmd;
2456 struct iscsi_conn *conn_p;
2457
2458 /*
2459 * Only send a Asynchronous Message on connections whos network
2460 * interface is still functional.
2461 */
2462 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2463 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2464 iscsit_inc_conn_usage_count(conn_p);
2465 break;
2466 }
2467 }
2468
2469 if (!conn_p)
2470 return;
2471
3c989d76 2472 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2473 if (!cmd) {
2474 iscsit_dec_conn_usage_count(conn_p);
2475 return;
2476 }
2477
2478 cmd->logout_cid = conn->cid;
2479 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2480 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2481
2482 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2483 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2484 spin_unlock_bh(&conn_p->cmd_lock);
2485
2486 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2487 iscsit_dec_conn_usage_count(conn_p);
2488}
2489
2490static int iscsit_send_conn_drop_async_message(
2491 struct iscsi_cmd *cmd,
2492 struct iscsi_conn *conn)
2493{
2494 struct iscsi_async *hdr;
2495
2496 cmd->tx_size = ISCSI_HDR_LEN;
2497 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2498
2499 hdr = (struct iscsi_async *) cmd->pdu;
2500 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2501 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2502 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2503 cmd->targ_xfer_tag = 0xFFFFFFFF;
2504 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2505 cmd->stat_sn = conn->stat_sn++;
2506 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2507 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2508 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2509 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2510 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2511 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2512 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2513
2514 if (conn->conn_ops->HeaderDigest) {
2515 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2516
80690fdb
GU		 2517 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2518 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2519
2520 cmd->tx_size += ISCSI_CRC_LEN;
2521 pr_debug("Attaching CRC32C HeaderDigest to"
2522 " Async Message 0x%08x\n", *header_digest);
2523 }
2524
2525 cmd->iov_misc[0].iov_base = cmd->pdu;
2526 cmd->iov_misc[0].iov_len = cmd->tx_size;
2527 cmd->iov_misc_count = 1;
2528
2529 pr_debug("Sending Connection Dropped Async Message StatSN:"
2530 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2531 cmd->logout_cid, conn->cid);
2532 return 0;
2533}
2534
6f3c0e69
AG		 2535static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2536{
2537 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2538 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2539 wait_for_completion_interruptible_timeout(
2540 &conn->tx_half_close_comp,
2541 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2542 }
2543}
2544
2ec5a8c1
NB		 2545static void
2546iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2547 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2548 bool set_statsn)
e48354ce 2549{
2ec5a8c1
NB		 2550 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2551 hdr->flags = datain->flags;
2552 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2553 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2554 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2555 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2556 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2557 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2558 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2559 }
2560 }
2561 hton24(hdr->dlength, datain->length);
2562 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2563 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2564 (struct scsi_lun *)&hdr->lun);
2565 else
2566 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2567
2568 hdr->itt = cmd->init_task_tag;
2569
2570 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2571 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2572 else
2573 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2574 if (set_statsn)
2575 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2576 else
2577 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2578
2579 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2580 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2581 hdr->datasn = cpu_to_be32(datain->data_sn);
2582 hdr->offset = cpu_to_be32(datain->offset);
2583
2584 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2585 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2586 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2587 ntohl(hdr->offset), datain->length, conn->cid);
2588}
2589
2590static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2591{
2592 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2593 struct iscsi_datain datain;
2594 struct iscsi_datain_req *dr;
e48354ce 2595 struct kvec *iov;
2ec5a8c1
NB		 2596 u32 iov_count = 0, tx_size = 0;
2597 int eodr = 0, ret, iov_ret;
2598 bool set_statsn = false;
e48354ce
NB		 2599
2600 memset(&datain, 0, sizeof(struct iscsi_datain));
2601 dr = iscsit_get_datain_values(cmd, &datain);
2602 if (!dr) {
2603 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2604 cmd->init_task_tag);
2605 return -1;
2606 }
e48354ce
NB		 2607 /*
2608 * Be paranoid and double check the logic for now.
2609 */
ebf1d95c 2610 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2611 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2612 " datain.length: %u exceeds cmd->data_length: %u\n",
2613 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2614 cmd->se_cmd.data_length);
e48354ce
NB		 2615 return -1;
2616 }
2617
2618 spin_lock_bh(&conn->sess->session_stats_lock);
2619 conn->sess->tx_data_octets += datain.length;
2620 if (conn->sess->se_sess->se_node_acl) {
2621 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2622 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2623 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2624 }
2625 spin_unlock_bh(&conn->sess->session_stats_lock);
2626 /*
2627 * Special case for successfully execution w/ both DATAIN
2628 * and Sense Data.
2629 */
2630 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2631 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2632 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2633 else {
2634 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2635 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2636 iscsit_increment_maxcmdsn(cmd, conn->sess);
2637 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2638 set_statsn = true;
e48354ce 2639 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2640 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2641 set_statsn = true;
e48354ce
NB		 2642 }
2643
2ec5a8c1 2644 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2645
2646 iov = &cmd->iov_data[0];
2647 iov[iov_count].iov_base = cmd->pdu;
2648 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2649 tx_size += ISCSI_HDR_LEN;
2650
2651 if (conn->conn_ops->HeaderDigest) {
2652 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2653
80690fdb
GU		 2654 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2655 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2656
2657 iov[0].iov_len += ISCSI_CRC_LEN;
2658 tx_size += ISCSI_CRC_LEN;
2659
2660 pr_debug("Attaching CRC32 HeaderDigest"
2661 " for DataIN PDU 0x%08x\n", *header_digest);
2662 }
2663
2ec5a8c1
NB		 2664 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2665 datain.offset, datain.length);
e48354ce
NB		 2666 if (iov_ret < 0)
2667 return -1;
2668
2669 iov_count += iov_ret;
2670 tx_size += datain.length;
2671
2672 cmd->padding = ((-datain.length) & 3);
2673 if (cmd->padding) {
2674 iov[iov_count].iov_base = cmd->pad_bytes;
2675 iov[iov_count++].iov_len = cmd->padding;
2676 tx_size += cmd->padding;
2677
2678 pr_debug("Attaching %u padding bytes\n",
2679 cmd->padding);
2680 }
2681 if (conn->conn_ops->DataDigest) {
2682 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2683 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2684
2685 iov[iov_count].iov_base = &cmd->data_crc;
2686 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2687 tx_size += ISCSI_CRC_LEN;
2688
2689 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2690 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2691 }
2692
2693 cmd->iov_data_count = iov_count;
2694 cmd->tx_size = tx_size;
2695
6f3c0e69
AG		 2696 /* sendpage is preferred but can't insert markers */
2697 if (!conn->conn_ops->IFMarker)
2698 ret = iscsit_fe_sendpage_sg(cmd, conn);
2699 else
2700 ret = iscsit_send_tx_data(cmd, conn, 0);
2701
2702 iscsit_unmap_iovec(cmd);
2703
2704 if (ret < 0) {
2705 iscsit_tx_thread_wait_for_tcp(conn);
2706 return ret;
2707 }
2708
e48354ce 2709 if (dr->dr_complete) {
6f3c0e69 2710 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2711 2 : 1;
2712 iscsit_free_datain_req(cmd, dr);
2713 }
2714
6f3c0e69 2715 return eodr;
e48354ce
NB		 2716}
2717
2ec5a8c1
NB		 2718int
2719iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2720 struct iscsi_logout_rsp *hdr)
e48354ce 2721{
e48354ce
NB		 2722 struct iscsi_conn *logout_conn = NULL;
2723 struct iscsi_conn_recovery *cr = NULL;
2724 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2725 /*
2726 * The actual shutting down of Sessions and/or Connections
2727 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2728 * is done in scsi_logout_post_handler().
2729 */
2730 switch (cmd->logout_reason) {
2731 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2732 pr_debug("iSCSI session logout successful, setting"
2733 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2734 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2735 break;
2736 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2737 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2738 break;
2739 /*
2740 * For CLOSECONNECTION logout requests carrying
2741 * a matching logout CID -> local CID, the reference
2742 * for the local CID will have been incremented in
2743 * iscsi_logout_closeconnection().
2744 *
2745 * For CLOSECONNECTION logout requests carrying
2746 * a different CID than the connection it arrived
2747 * on, the connection responding to cmd->logout_cid
2748 * is stopped in iscsit_logout_post_handler_diffcid().
2749 */
2750
2751 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2752 " successful.\n", cmd->logout_cid, conn->cid);
2753 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2754 break;
2755 case ISCSI_LOGOUT_REASON_RECOVERY:
2756 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2757 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2758 break;
2759 /*
2760 * If the connection is still active from our point of view
2761 * force connection recovery to occur.
2762 */
2763 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2764 cmd->logout_cid);
ee1b1b9c 2765 if (logout_conn) {
e48354ce
NB		 2766 iscsit_connection_reinstatement_rcfr(logout_conn);
2767 iscsit_dec_conn_usage_count(logout_conn);
2768 }
2769
2770 cr = iscsit_get_inactive_connection_recovery_entry(
2771 conn->sess, cmd->logout_cid);
2772 if (!cr) {
2773 pr_err("Unable to locate CID: %hu for"
2774 " REMOVECONNFORRECOVERY Logout Request.\n",
2775 cmd->logout_cid);
2776 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2777 break;
2778 }
2779
2780 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2781
2782 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2783 " for recovery for CID: %hu on CID: %hu successful.\n",
2784 cmd->logout_cid, conn->cid);
2785 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2786 break;
2787 default:
2788 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2789 cmd->logout_reason);
2790 return -1;
2791 }
2792
e48354ce
NB		 2793 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2794 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2795 hdr->response = cmd->logout_response;
66c7db68 2796 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2797 cmd->stat_sn = conn->stat_sn++;
2798 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2799
2800 iscsit_increment_maxcmdsn(cmd, conn->sess);
2801 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2802 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2803
2ec5a8c1
NB		 2804 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2805 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2806 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2807 cmd->logout_cid, conn->cid);
2808
2809 return 0;
2810}
2811EXPORT_SYMBOL(iscsit_build_logout_rsp);
2812
2813static int
2814iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2815{
2816 struct kvec *iov;
2817 int niov = 0, tx_size, rc;
2818
2819 rc = iscsit_build_logout_rsp(cmd, conn,
2820 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2821 if (rc < 0)
2822 return rc;
2823
2824 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2825 iov = &cmd->iov_misc[0];
2826 iov[niov].iov_base = cmd->pdu;
2827 iov[niov++].iov_len = ISCSI_HDR_LEN;
2828
2829 if (conn->conn_ops->HeaderDigest) {
2830 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2831
80690fdb
GU		 2832 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2833 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2834
2835 iov[0].iov_len += ISCSI_CRC_LEN;
2836 tx_size += ISCSI_CRC_LEN;
2837 pr_debug("Attaching CRC32C HeaderDigest to"
2838 " Logout Response 0x%08x\n", *header_digest);
2839 }
2840 cmd->iov_misc_count = niov;
2841 cmd->tx_size = tx_size;
2842
e48354ce
NB		 2843 return 0;
2844}
2845
2ec5a8c1
NB		 2846void
2847iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2848 struct iscsi_nopin *hdr, bool nopout_response)
2849{
2850 hdr->opcode = ISCSI_OP_NOOP_IN;
2851 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2852 hton24(hdr->dlength, cmd->buf_ptr_size);
2853 if (nopout_response)
2854 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2855 hdr->itt = cmd->init_task_tag;
2856 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2857 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2858 conn->stat_sn;
2859 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2860
2861 if (nopout_response)
2862 iscsit_increment_maxcmdsn(cmd, conn->sess);
2863
2864 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2865 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2866
2867 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2868 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2869 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2870 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2871}
2872EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2873
e48354ce
NB		 2874/*
2875 * Unsolicited NOPIN, either requesting a response or not.
2876 */
2877static int iscsit_send_unsolicited_nopin(
2878 struct iscsi_cmd *cmd,
2879 struct iscsi_conn *conn,
2880 int want_response)
2881{
2ec5a8c1
NB		 2882 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2883 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2884
2ec5a8c1 2885 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2886
2887 if (conn->conn_ops->HeaderDigest) {
2888 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2889
80690fdb
GU		 2890 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2891 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2892
2893 tx_size += ISCSI_CRC_LEN;
2894 pr_debug("Attaching CRC32C HeaderDigest to"
2895 " NopIN 0x%08x\n", *header_digest);
2896 }
2897
2898 cmd->iov_misc[0].iov_base = cmd->pdu;
2899 cmd->iov_misc[0].iov_len = tx_size;
2900 cmd->iov_misc_count = 1;
2901 cmd->tx_size = tx_size;
2902
2903 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2904 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2905
6f3c0e69
AG		 2906 ret = iscsit_send_tx_data(cmd, conn, 1);
2907 if (ret < 0) {
2908 iscsit_tx_thread_wait_for_tcp(conn);
2909 return ret;
2910 }
2911
2912 spin_lock_bh(&cmd->istate_lock);
2913 cmd->i_state = want_response ?
2914 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2915 spin_unlock_bh(&cmd->istate_lock);
2916
e48354ce
NB		 2917 return 0;
2918}
2919
2ec5a8c1
NB		 2920static int
2921iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2922{
2ec5a8c1 2923 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2924 struct kvec *iov;
2ec5a8c1
NB		 2925 u32 padding = 0;
2926 int niov = 0, tx_size;
e48354ce 2927
2ec5a8c1 2928 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2929
2ec5a8c1 2930 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2931 iov = &cmd->iov_misc[0];
2932 iov[niov].iov_base = cmd->pdu;
2933 iov[niov++].iov_len = ISCSI_HDR_LEN;
2934
2935 if (conn->conn_ops->HeaderDigest) {
2936 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2937
80690fdb
GU		 2938 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2939 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2940
2941 iov[0].iov_len += ISCSI_CRC_LEN;
2942 tx_size += ISCSI_CRC_LEN;
2943 pr_debug("Attaching CRC32C HeaderDigest"
2944 " to NopIn 0x%08x\n", *header_digest);
2945 }
2946
2947 /*
2948 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2949 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2950 */
2951 if (cmd->buf_ptr_size) {
2952 iov[niov].iov_base = cmd->buf_ptr;
2953 iov[niov++].iov_len = cmd->buf_ptr_size;
2954 tx_size += cmd->buf_ptr_size;
2955
2956 pr_debug("Echoing back %u bytes of ping"
2957 " data.\n", cmd->buf_ptr_size);
2958
2959 padding = ((-cmd->buf_ptr_size) & 3);
2960 if (padding != 0) {
2961 iov[niov].iov_base = &cmd->pad_bytes;
2962 iov[niov++].iov_len = padding;
2963 tx_size += padding;
2964 pr_debug("Attaching %u additional"
2965 " padding bytes.\n", padding);
2966 }
2967 if (conn->conn_ops->DataDigest) {
2968 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2969 cmd->buf_ptr, cmd->buf_ptr_size,
2970 padding, (u8 *)&cmd->pad_bytes,
2971 (u8 *)&cmd->data_crc);
2972
2973 iov[niov].iov_base = &cmd->data_crc;
2974 iov[niov++].iov_len = ISCSI_CRC_LEN;
2975 tx_size += ISCSI_CRC_LEN;
2976 pr_debug("Attached DataDigest for %u"
2977 " bytes of ping data, CRC 0x%08x\n",
2978 cmd->buf_ptr_size, cmd->data_crc);
2979 }
2980 }
2981
2982 cmd->iov_misc_count = niov;
2983 cmd->tx_size = tx_size;
2984
e48354ce
NB		 2985 return 0;
2986}
2987
6f3c0e69 2988static int iscsit_send_r2t(
e48354ce
NB		 2989 struct iscsi_cmd *cmd,
2990 struct iscsi_conn *conn)
2991{
2992 int tx_size = 0;
2993 struct iscsi_r2t *r2t;
2994 struct iscsi_r2t_rsp *hdr;
6f3c0e69 2995 int ret;
e48354ce
NB		 2996
2997 r2t = iscsit_get_r2t_from_list(cmd);
2998 if (!r2t)
2999 return -1;
3000
3001 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3002 memset(hdr, 0, ISCSI_HDR_LEN);
3003 hdr->opcode = ISCSI_OP_R2T;
3004 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3005 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3006 (struct scsi_lun *)&hdr->lun);
66c7db68 3007 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3008 spin_lock_bh(&conn->sess->ttt_lock);
3009 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3010 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3011 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3012 spin_unlock_bh(&conn->sess->ttt_lock);
3013 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3014 hdr->statsn = cpu_to_be32(conn->stat_sn);
3015 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3016 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3017 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3018 hdr->data_offset = cpu_to_be32(r2t->offset);
3019 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3020
3021 cmd->iov_misc[0].iov_base = cmd->pdu;
3022 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3023 tx_size += ISCSI_HDR_LEN;
3024
3025 if (conn->conn_ops->HeaderDigest) {
3026 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3027
80690fdb
GU		 3028 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3029 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3030
3031 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3032 tx_size += ISCSI_CRC_LEN;
3033 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3034 " PDU 0x%08x\n", *header_digest);
3035 }
3036
3037 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3038 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3039 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3040 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3041 r2t->offset, r2t->xfer_len, conn->cid);
3042
3043 cmd->iov_misc_count = 1;
3044 cmd->tx_size = tx_size;
3045
3046 spin_lock_bh(&cmd->r2t_lock);
3047 r2t->sent_r2t = 1;
3048 spin_unlock_bh(&cmd->r2t_lock);
3049
6f3c0e69
AG		 3050 ret = iscsit_send_tx_data(cmd, conn, 1);
3051 if (ret < 0) {
3052 iscsit_tx_thread_wait_for_tcp(conn);
3053 return ret;
3054 }
3055
3056 spin_lock_bh(&cmd->dataout_timeout_lock);
3057 iscsit_start_dataout_timer(cmd, conn);
3058 spin_unlock_bh(&cmd->dataout_timeout_lock);
3059
e48354ce
NB		 3060 return 0;
3061}
3062
3063/*
8b1e1244
AG		 3064 * @recovery: If called from iscsi_task_reassign_complete_write() for
3065 * connection recovery.
e48354ce
NB		 3066 */
3067int iscsit_build_r2ts_for_cmd(
e48354ce 3068 struct iscsi_conn *conn,
3e1c81a9 3069 struct iscsi_cmd *cmd,
8b1e1244 3070 bool recovery)
e48354ce
NB		 3071{
3072 int first_r2t = 1;
3073 u32 offset = 0, xfer_len = 0;
3074
3075 spin_lock_bh(&cmd->r2t_lock);
3076 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3077 spin_unlock_bh(&cmd->r2t_lock);
3078 return 0;
3079 }
3080
8b1e1244
AG		 3081 if (conn->sess->sess_ops->DataSequenceInOrder &&
3082 !recovery)
c6037cc5 3083 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3084
3085 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3086 if (conn->sess->sess_ops->DataSequenceInOrder) {
3087 offset = cmd->r2t_offset;
3088
8b1e1244
AG		 3089 if (first_r2t && recovery) {
3090 int new_data_end = offset +
3091 conn->sess->sess_ops->MaxBurstLength -
3092 cmd->next_burst_len;
3093
ebf1d95c
AG		 3094 if (new_data_end > cmd->se_cmd.data_length)
3095 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3096 else
3097 xfer_len =
3098 conn->sess->sess_ops->MaxBurstLength -
3099 cmd->next_burst_len;
e48354ce 3100 } else {
8b1e1244
AG		 3101 int new_data_end = offset +
3102 conn->sess->sess_ops->MaxBurstLength;
3103
ebf1d95c
AG		 3104 if (new_data_end > cmd->se_cmd.data_length)
3105 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3106 else
3107 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3108 }
3109 cmd->r2t_offset += xfer_len;
3110
ebf1d95c 3111 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3112 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3113 } else {
3114 struct iscsi_seq *seq;
3115
3116 seq = iscsit_get_seq_holder_for_r2t(cmd);
3117 if (!seq) {
3118 spin_unlock_bh(&cmd->r2t_lock);
3119 return -1;
3120 }
3121
3122 offset = seq->offset;
3123 xfer_len = seq->xfer_len;
3124
3125 if (cmd->seq_send_order == cmd->seq_count)
3126 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3127 }
3128 cmd->outstanding_r2ts++;
3129 first_r2t = 0;
3130
3131 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3132 spin_unlock_bh(&cmd->r2t_lock);
3133 return -1;
3134 }
3135
3136 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3137 break;
3138 }
3139 spin_unlock_bh(&cmd->r2t_lock);
3140
3141 return 0;
3142}
3143
2ec5a8c1
NB		 3144void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3145 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3146{
2ec5a8c1 3147 if (inc_stat_sn)
e48354ce
NB		 3148 cmd->stat_sn = conn->stat_sn++;
3149
3150 spin_lock_bh(&conn->sess->session_stats_lock);
3151 conn->sess->rsp_pdus++;
3152 spin_unlock_bh(&conn->sess->session_stats_lock);
3153
e48354ce
NB		 3154 memset(hdr, 0, ISCSI_HDR_LEN);
3155 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3156 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3157 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3158 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3159 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3160 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3161 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3162 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3163 }
3164 hdr->response = cmd->iscsi_response;
3165 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3166 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3167 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3168
3169 iscsit_increment_maxcmdsn(cmd, conn->sess);
3170 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3171 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3172
2ec5a8c1
NB		 3173 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3174 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3175 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3176 cmd->se_cmd.scsi_status, conn->cid);
3177}
3178EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3179
3180static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3181{
3182 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3183 struct kvec *iov;
3184 u32 padding = 0, tx_size = 0;
3185 int iov_count = 0;
3186 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3187
3188 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3189
e48354ce
NB		 3190 iov = &cmd->iov_misc[0];
3191 iov[iov_count].iov_base = cmd->pdu;
3192 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3193 tx_size += ISCSI_HDR_LEN;
3194
3195 /*
3196 * Attach SENSE DATA payload to iSCSI Response PDU
3197 */
3198 if (cmd->se_cmd.sense_buffer &&
3199 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3200 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3201 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3202 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3203
e48354ce 3204 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3205 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3206 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3207 iov[iov_count++].iov_len =
3208 (cmd->se_cmd.scsi_sense_length + padding);
3209 tx_size += cmd->se_cmd.scsi_sense_length;
3210
3211 if (padding) {
9c58b7dd 3212 memset(cmd->sense_buffer +
e48354ce
NB		 3213 cmd->se_cmd.scsi_sense_length, 0, padding);
3214 tx_size += padding;
3215 pr_debug("Adding %u bytes of padding to"
3216 " SENSE.\n", padding);
3217 }
3218
3219 if (conn->conn_ops->DataDigest) {
3220 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3221 cmd->sense_buffer,
e48354ce
NB		 3222 (cmd->se_cmd.scsi_sense_length + padding),
3223 0, NULL, (u8 *)&cmd->data_crc);
3224
3225 iov[iov_count].iov_base = &cmd->data_crc;
3226 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3227 tx_size += ISCSI_CRC_LEN;
3228
3229 pr_debug("Attaching CRC32 DataDigest for"
3230 " SENSE, %u bytes CRC 0x%08x\n",
3231 (cmd->se_cmd.scsi_sense_length + padding),
3232 cmd->data_crc);
3233 }
3234
3235 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3236 " Response PDU\n",
3237 cmd->se_cmd.scsi_sense_length);
3238 }
3239
3240 if (conn->conn_ops->HeaderDigest) {
3241 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3242
80690fdb
GU		 3243 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3244 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3245
3246 iov[0].iov_len += ISCSI_CRC_LEN;
3247 tx_size += ISCSI_CRC_LEN;
3248 pr_debug("Attaching CRC32 HeaderDigest for Response"
3249 " PDU 0x%08x\n", *header_digest);
3250 }
3251
3252 cmd->iov_misc_count = iov_count;
3253 cmd->tx_size = tx_size;
3254
e48354ce
NB		 3255 return 0;
3256}
3257
3258static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3259{
3260 switch (se_tmr->response) {
3261 case TMR_FUNCTION_COMPLETE:
3262 return ISCSI_TMF_RSP_COMPLETE;
3263 case TMR_TASK_DOES_NOT_EXIST:
3264 return ISCSI_TMF_RSP_NO_TASK;
3265 case TMR_LUN_DOES_NOT_EXIST:
3266 return ISCSI_TMF_RSP_NO_LUN;
3267 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3268 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3269 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3270 return ISCSI_TMF_RSP_AUTH_FAILED;
3271 case TMR_FUNCTION_REJECTED:
3272 default:
3273 return ISCSI_TMF_RSP_REJECTED;
3274 }
3275}
3276
2ec5a8c1
NB		 3277void
3278iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3279 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3280{
3281 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3282
e48354ce 3283 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3284 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3285 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3286 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3287 cmd->stat_sn = conn->stat_sn++;
3288 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3289
3290 iscsit_increment_maxcmdsn(cmd, conn->sess);
3291 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3292 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3293
2ec5a8c1
NB		 3294 pr_debug("Built Task Management Response ITT: 0x%08x,"
3295 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3296 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3297}
3298EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3299
3300static int
3301iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3302{
3303 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3304 u32 tx_size = 0;
3305
3306 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3307
e48354ce
NB		 3308 cmd->iov_misc[0].iov_base = cmd->pdu;
3309 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3310 tx_size += ISCSI_HDR_LEN;
3311
3312 if (conn->conn_ops->HeaderDigest) {
3313 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3314
80690fdb
GU		 3315 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3316 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3317
3318 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3319 tx_size += ISCSI_CRC_LEN;
3320 pr_debug("Attaching CRC32 HeaderDigest for Task"
3321 " Mgmt Response PDU 0x%08x\n", *header_digest);
3322 }
3323
3324 cmd->iov_misc_count = 1;
3325 cmd->tx_size = tx_size;
3326
e48354ce
NB		 3327 return 0;
3328}
3329
2f9bc894
NB		 3330static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3331{
3332 bool ret = false;
3333
3334 if (np->np_sockaddr.ss_family == AF_INET6) {
3335 const struct sockaddr_in6 sin6 = {
3336 .sin6_addr = IN6ADDR_ANY_INIT };
3337 struct sockaddr_in6 *sock_in6 =
3338 (struct sockaddr_in6 *)&np->np_sockaddr;
3339
3340 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3341 sin6.sin6_addr.s6_addr, 16))
3342 ret = true;
3343 } else {
3344 struct sockaddr_in * sock_in =
3345 (struct sockaddr_in *)&np->np_sockaddr;
3346
cea0b4ce 3347 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3348 ret = true;
3349 }
3350
3351 return ret;
3352}
3353
8b1e1244
AG		 3354#define SENDTARGETS_BUF_LIMIT 32768U
3355
e48354ce
NB		 3356static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3357{
3358 char *payload = NULL;
3359 struct iscsi_conn *conn = cmd->conn;
3360 struct iscsi_portal_group *tpg;
3361 struct iscsi_tiqn *tiqn;
3362 struct iscsi_tpg_np *tpg_np;
3363 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3364 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
e48354ce 3365
8b1e1244
AG		 3366 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3367 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3368
3369 payload = kzalloc(buffer_len, GFP_KERNEL);
3370 if (!payload) {
3371 pr_err("Unable to allocate memory for sendtargets"
3372 " response.\n");
3373 return -ENOMEM;
3374 }
3375
3376 spin_lock(&tiqn_lock);
3377 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3378 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3379 len += 1;
3380
3381 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3382 end_of_buf = 1;
3383 goto eob;
3384 }
8359cf43 3385 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3386 payload_len += len;
3387
3388 spin_lock(&tiqn->tiqn_tpg_lock);
3389 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3390
3391 spin_lock(&tpg->tpg_state_lock);
3392 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3393 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3394 spin_unlock(&tpg->tpg_state_lock);
3395 continue;
3396 }
3397 spin_unlock(&tpg->tpg_state_lock);
3398
3399 spin_lock(&tpg->tpg_np_lock);
3400 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3401 tpg_np_list) {
2f9bc894
NB		 3402 struct iscsi_np *np = tpg_np->tpg_np;
3403 bool inaddr_any = iscsit_check_inaddr_any(np);
3404
e48354ce
NB		 3405 len = sprintf(buf, "TargetAddress="
3406 "%s%s%s:%hu,%hu",
2f9bc894
NB		 3407 (np->np_sockaddr.ss_family == AF_INET6) ?
3408 "[" : "", (inaddr_any == false) ?
3409 np->np_ip : conn->local_ip,
3410 (np->np_sockaddr.ss_family == AF_INET6) ?
3411 "]" : "", (inaddr_any == false) ?
3412 np->np_port : conn->local_port,
e48354ce
NB		 3413 tpg->tpgt);
3414 len += 1;
3415
3416 if ((len + payload_len) > buffer_len) {
3417 spin_unlock(&tpg->tpg_np_lock);
3418 spin_unlock(&tiqn->tiqn_tpg_lock);
3419 end_of_buf = 1;
3420 goto eob;
3421 }
8359cf43 3422 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3423 payload_len += len;
3424 }
3425 spin_unlock(&tpg->tpg_np_lock);
3426 }
3427 spin_unlock(&tiqn->tiqn_tpg_lock);
3428eob:
3429 if (end_of_buf)
3430 break;
3431 }
3432 spin_unlock(&tiqn_lock);
3433
3434 cmd->buf_ptr = payload;
3435
3436 return payload_len;
3437}
3438
3439/*
3440 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3441 * MaxRecvDataSegmentLength.
3442 */
3443static int iscsit_send_text_rsp(
3444 struct iscsi_cmd *cmd,
3445 struct iscsi_conn *conn)
3446{
3447 struct iscsi_text_rsp *hdr;
3448 struct kvec *iov;
3449 u32 padding = 0, tx_size = 0;
3450 int text_length, iov_count = 0;
3451
3452 text_length = iscsit_build_sendtargets_response(cmd);
3453 if (text_length < 0)
3454 return text_length;
3455
3456 padding = ((-text_length) & 3);
3457 if (padding != 0) {
3458 memset(cmd->buf_ptr + text_length, 0, padding);
3459 pr_debug("Attaching %u additional bytes for"
3460 " padding.\n", padding);
3461 }
3462
3463 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3464 memset(hdr, 0, ISCSI_HDR_LEN);
3465 hdr->opcode = ISCSI_OP_TEXT_RSP;
3466 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3467 hton24(hdr->dlength, text_length);
66c7db68 3468 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3469 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3470 cmd->stat_sn = conn->stat_sn++;
3471 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3472
3473 iscsit_increment_maxcmdsn(cmd, conn->sess);
3474 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3475 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3476
3477 iov = &cmd->iov_misc[0];
3478
3479 iov[iov_count].iov_base = cmd->pdu;
3480 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3481 iov[iov_count].iov_base = cmd->buf_ptr;
3482 iov[iov_count++].iov_len = text_length + padding;
3483
3484 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3485
3486 if (conn->conn_ops->HeaderDigest) {
3487 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3488
80690fdb
GU		 3489 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3490 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3491
3492 iov[0].iov_len += ISCSI_CRC_LEN;
3493 tx_size += ISCSI_CRC_LEN;
3494 pr_debug("Attaching CRC32 HeaderDigest for"
3495 " Text Response PDU 0x%08x\n", *header_digest);
3496 }
3497
3498 if (conn->conn_ops->DataDigest) {
3499 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3500 cmd->buf_ptr, (text_length + padding),
3501 0, NULL, (u8 *)&cmd->data_crc);
3502
3503 iov[iov_count].iov_base = &cmd->data_crc;
3504 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3505 tx_size += ISCSI_CRC_LEN;
3506
3507 pr_debug("Attaching DataDigest for %u bytes of text"
3508 " data, CRC 0x%08x\n", (text_length + padding),
3509 cmd->data_crc);
3510 }
3511
3512 cmd->iov_misc_count = iov_count;
3513 cmd->tx_size = tx_size;
3514
3515 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3516 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3517 text_length, conn->cid);
3518 return 0;
3519}
3520
2ec5a8c1
NB		 3521void
3522iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3523 struct iscsi_reject *hdr)
3524{
3525 hdr->opcode = ISCSI_OP_REJECT;
1aa58ccd 3526 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3527 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3528 hton24(hdr->dlength, ISCSI_HDR_LEN);
3529 hdr->ffffffff = cpu_to_be32(0xffffffff);
3530 cmd->stat_sn = conn->stat_sn++;
3531 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3532 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3533 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3534
3535}
3536EXPORT_SYMBOL(iscsit_build_reject);
3537
e48354ce
NB		 3538static int iscsit_send_reject(
3539 struct iscsi_cmd *cmd,
3540 struct iscsi_conn *conn)
3541{
bfbdb31d 3542 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3543 struct kvec *iov;
bfbdb31d 3544 u32 iov_count = 0, tx_size;
e48354ce 3545
bfbdb31d 3546 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3547
3548 iov = &cmd->iov_misc[0];
e48354ce
NB		 3549 iov[iov_count].iov_base = cmd->pdu;
3550 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3551 iov[iov_count].iov_base = cmd->buf_ptr;
3552 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3553
3554 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3555
3556 if (conn->conn_ops->HeaderDigest) {
3557 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3558
80690fdb
GU		 3559 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3560 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3561
3562 iov[0].iov_len += ISCSI_CRC_LEN;
3563 tx_size += ISCSI_CRC_LEN;
3564 pr_debug("Attaching CRC32 HeaderDigest for"
3565 " REJECT PDU 0x%08x\n", *header_digest);
3566 }
3567
3568 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3569 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3570 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3571
3572 iov[iov_count].iov_base = &cmd->data_crc;
3573 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3574 tx_size += ISCSI_CRC_LEN;
3575 pr_debug("Attaching CRC32 DataDigest for REJECT"
3576 " PDU 0x%08x\n", cmd->data_crc);
3577 }
3578
3579 cmd->iov_misc_count = iov_count;
3580 cmd->tx_size = tx_size;
3581
3582 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3583 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3584
3585 return 0;
3586}
3587
e48354ce
NB		 3588void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3589{
3590 struct iscsi_thread_set *ts = conn->thread_set;
3591 int ord, cpu;
3592 /*
3593 * thread_id is assigned from iscsit_global->ts_bitmap from
3594 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3595 *
3596 * Here we use thread_id to determine which CPU that this
3597 * iSCSI connection's iscsi_thread_set will be scheduled to
3598 * execute upon.
3599 */
3600 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3601 for_each_online_cpu(cpu) {
3602 if (ord-- == 0) {
3603 cpumask_set_cpu(cpu, conn->conn_cpumask);
3604 return;
3605 }
3606 }
3607 /*
3608 * This should never be reached..
3609 */
3610 dump_stack();
3611 cpumask_setall(conn->conn_cpumask);
3612}
3613
3614static inline void iscsit_thread_check_cpumask(
3615 struct iscsi_conn *conn,
3616 struct task_struct *p,
3617 int mode)
3618{
3619 char buf[128];
3620 /*
3621 * mode == 1 signals iscsi_target_tx_thread() usage.
3622 * mode == 0 signals iscsi_target_rx_thread() usage.
3623 */
3624 if (mode == 1) {
3625 if (!conn->conn_tx_reset_cpumask)
3626 return;
3627 conn->conn_tx_reset_cpumask = 0;
3628 } else {
3629 if (!conn->conn_rx_reset_cpumask)
3630 return;
3631 conn->conn_rx_reset_cpumask = 0;
3632 }
3633 /*
3634 * Update the CPU mask for this single kthread so that
3635 * both TX and RX kthreads are scheduled to run on the
3636 * same CPU.
3637 */
3638 memset(buf, 0, 128);
3639 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3640 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3641}
3642
2ec5a8c1
NB		 3643static int
3644iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3645{
6f3c0e69
AG		 3646 int ret;
3647
2ec5a8c1
NB		 3648 switch (state) {
3649 case ISTATE_SEND_R2T:
3650 ret = iscsit_send_r2t(cmd, conn);
3651 if (ret < 0)
3652 goto err;
3653 break;
3654 case ISTATE_REMOVE:
3655 spin_lock_bh(&conn->cmd_lock);
3656 list_del(&cmd->i_conn_node);
3657 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3658
aafc9d15 3659 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3660 break;
3661 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3662 iscsit_mod_nopin_response_timer(conn);
3663 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3664 if (ret < 0)
6f3c0e69 3665 goto err;
2ec5a8c1
NB		 3666 break;
3667 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3668 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3669 if (ret < 0)
3670 goto err;
3671 break;
3672 default:
3673 pr_err("Unknown Opcode: 0x%02x ITT:"
3674 " 0x%08x, i_state: %d on CID: %hu\n",
3675 cmd->iscsi_opcode, cmd->init_task_tag, state,
3676 conn->cid);
3677 goto err;
6f3c0e69
AG		 3678 }
3679
3680 return 0;
3681
3682err:
3683 return -1;
3684}
3685
2ec5a8c1
NB		 3686static int
3687iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3688{
2ec5a8c1 3689 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3690 struct iscsi_queue_req *qr;
3691 struct iscsi_cmd *cmd;
3692 u8 state;
3693 int ret;
3694
2ec5a8c1
NB		 3695 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3696 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3697 cmd = qr->cmd;
3698 state = qr->state;
3699 kmem_cache_free(lio_qr_cache, qr);
3700
2ec5a8c1
NB		 3701 ret = t->iscsit_immediate_queue(conn, cmd, state);
3702 if (ret < 0)
3703 return ret;
3704 }
fd3a9025 3705
2ec5a8c1
NB		 3706 return 0;
3707}
6f3c0e69 3708
2ec5a8c1
NB		 3709static int
3710iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3711{
3712 int ret;
3713
3714check_rsp_state:
3715 switch (state) {
3716 case ISTATE_SEND_DATAIN:
3717 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3718 if (ret < 0)
3719 goto err;
2ec5a8c1
NB		 3720 else if (!ret)
3721 /* more drs */
3722 goto check_rsp_state;
3723 else if (ret == 1) {
3724 /* all done */
3725 spin_lock_bh(&cmd->istate_lock);
3726 cmd->i_state = ISTATE_SENT_STATUS;
3727 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3728
2ec5a8c1
NB		 3729 if (atomic_read(&conn->check_immediate_queue))
3730 return 1;
6f3c0e69 3731
2ec5a8c1
NB		 3732 return 0;
3733 } else if (ret == 2) {
3734 /* Still must send status,
3735 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3736 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3737 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3738 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3739 state = ISTATE_SEND_STATUS;
3740 goto check_rsp_state;
3741 }
3742
3743 break;
3744 case ISTATE_SEND_STATUS:
3745 case ISTATE_SEND_STATUS_RECOVERY:
3746 ret = iscsit_send_response(cmd, conn);
3747 break;
3748 case ISTATE_SEND_LOGOUTRSP:
3749 ret = iscsit_send_logout(cmd, conn);
3750 break;
3751 case ISTATE_SEND_ASYNCMSG:
3752 ret = iscsit_send_conn_drop_async_message(
3753 cmd, conn);
3754 break;
3755 case ISTATE_SEND_NOPIN:
3756 ret = iscsit_send_nopin(cmd, conn);
3757 break;
3758 case ISTATE_SEND_REJECT:
3759 ret = iscsit_send_reject(cmd, conn);
3760 break;
3761 case ISTATE_SEND_TASKMGTRSP:
3762 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3763 if (ret != 0)
6f3c0e69 3764 break;
2ec5a8c1
NB		 3765 ret = iscsit_tmr_post_handler(cmd, conn);
3766 if (ret != 0)
3767 iscsit_fall_back_to_erl0(conn->sess);
3768 break;
3769 case ISTATE_SEND_TEXTRSP:
3770 ret = iscsit_send_text_rsp(cmd, conn);
3771 break;
3772 default:
3773 pr_err("Unknown Opcode: 0x%02x ITT:"
3774 " 0x%08x, i_state: %d on CID: %hu\n",
3775 cmd->iscsi_opcode, cmd->init_task_tag,
3776 state, conn->cid);
3777 goto err;
3778 }
3779 if (ret < 0)
3780 goto err;
3781
3782 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3783 iscsit_tx_thread_wait_for_tcp(conn);
3784 iscsit_unmap_iovec(cmd);
3785 goto err;
3786 }
3787 iscsit_unmap_iovec(cmd);
3788
3789 switch (state) {
3790 case ISTATE_SEND_LOGOUTRSP:
3791 if (!iscsit_logout_post_handler(cmd, conn))
3792 goto restart;
3793 /* fall through */
3794 case ISTATE_SEND_STATUS:
3795 case ISTATE_SEND_ASYNCMSG:
3796 case ISTATE_SEND_NOPIN:
3797 case ISTATE_SEND_STATUS_RECOVERY:
3798 case ISTATE_SEND_TEXTRSP:
3799 case ISTATE_SEND_TASKMGTRSP:
1aa58ccd 3800 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3801 spin_lock_bh(&cmd->istate_lock);
3802 cmd->i_state = ISTATE_SENT_STATUS;
3803 spin_unlock_bh(&cmd->istate_lock);
3804 break;
2ec5a8c1
NB		 3805 default:
3806 pr_err("Unknown Opcode: 0x%02x ITT:"
3807 " 0x%08x, i_state: %d on CID: %hu\n",
3808 cmd->iscsi_opcode, cmd->init_task_tag,
3809 cmd->i_state, conn->cid);
3810 goto err;
6f3c0e69
AG		 3811 }
3812
2ec5a8c1
NB		 3813 if (atomic_read(&conn->check_immediate_queue))
3814 return 1;
3815
6f3c0e69
AG		 3816 return 0;
3817
3818err:
3819 return -1;
3820restart:
3821 return -EAGAIN;
3822}
3823
2ec5a8c1
NB		 3824static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3825{
3826 struct iscsit_transport *t = conn->conn_transport;
3827 struct iscsi_queue_req *qr;
3828 struct iscsi_cmd *cmd;
3829 u8 state;
3830 int ret;
3831
3832 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3833 cmd = qr->cmd;
3834 state = qr->state;
3835 kmem_cache_free(lio_qr_cache, qr);
3836
3837 ret = t->iscsit_response_queue(conn, cmd, state);
3838 if (ret == 1 || ret < 0)
3839 return ret;
3840 }
3841
3842 return 0;
3843}
3844
6f3c0e69
AG		 3845int iscsi_target_tx_thread(void *arg)
3846{
e48354ce 3847 int ret = 0;
e48354ce 3848 struct iscsi_conn *conn;
8359cf43 3849 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3850 /*
3851 * Allow ourselves to be interrupted by SIGINT so that a
3852 * connection recovery / failure event can be triggered externally.
3853 */
3854 allow_signal(SIGINT);
3855
3856restart:
3857 conn = iscsi_tx_thread_pre_handler(ts);
3858 if (!conn)
3859 goto out;
3860
6f3c0e69 3861 ret = 0;
e48354ce
NB		 3862
3863 while (!kthread_should_stop()) {
3864 /*
3865 * Ensure that both TX and RX per connection kthreads
3866 * are scheduled to run on the same CPU.
3867 */
3868 iscsit_thread_check_cpumask(conn, current, 1);
3869
d5627acb
RD		 3870 wait_event_interruptible(conn->queues_wq,
3871 !iscsit_conn_all_queues_empty(conn) ||
3872 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3873
3874 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3875 signal_pending(current))
3876 goto transport_err;
3877
fd3a9025 3878get_immediate:
2ec5a8c1 3879 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3880 if (ret < 0)
3881 goto transport_err;
e48354ce 3882
2ec5a8c1 3883 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3884 if (ret == 1)
3885 goto get_immediate;
3886 else if (ret == -EAGAIN)
6f3c0e69
AG		 3887 goto restart;
3888 else if (ret < 0)
3889 goto transport_err;
e48354ce
NB		 3890 }
3891
3892transport_err:
3893 iscsit_take_action_for_connection_exit(conn);
3894 goto restart;
3895out:
3896 return 0;
3897}
3898
3e1c81a9
NB		 3899static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3900{
3901 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3902 struct iscsi_cmd *cmd;
3903 int ret = 0;
3904
3905 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3906 case ISCSI_OP_SCSI_CMD:
3907 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3908 if (!cmd)
1aa58ccd 3909 goto reject;
3e1c81a9
NB		 3910
3911 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3912 break;
3913 case ISCSI_OP_SCSI_DATA_OUT:
3914 ret = iscsit_handle_data_out(conn, buf);
3915 break;
3916 case ISCSI_OP_NOOP_OUT:
3917 cmd = NULL;
3918 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3919 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3920 if (!cmd)
1aa58ccd 3921 goto reject;
3e1c81a9
NB		 3922 }
3923 ret = iscsit_handle_nop_out(conn, cmd, buf);
3924 break;
3925 case ISCSI_OP_SCSI_TMFUNC:
3926 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3927 if (!cmd)
1aa58ccd 3928 goto reject;
3e1c81a9
NB		 3929
3930 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3931 break;
3932 case ISCSI_OP_TEXT:
3933 ret = iscsit_handle_text_cmd(conn, buf);
3934 break;
3935 case ISCSI_OP_LOGOUT:
3936 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3937 if (!cmd)
1aa58ccd 3938 goto reject;
3e1c81a9
NB		 3939
3940 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3941 if (ret > 0)
3942 wait_for_completion_timeout(&conn->conn_logout_comp,
3943 SECONDS_FOR_LOGOUT_COMP * HZ);
3944 break;
3945 case ISCSI_OP_SNACK:
3946 ret = iscsit_handle_snack(conn, buf);
3947 break;
3948 default:
3949 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3950 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3951 pr_err("Cannot recover from unknown"
3952 " opcode while ERL=0, closing iSCSI connection.\n");
3953 return -1;
3954 }
3955 if (!conn->conn_ops->OFMarker) {
3956 pr_err("Unable to recover from unknown"
3957 " opcode while OFMarker=No, closing iSCSI"
3958 " connection.\n");
3959 return -1;
3960 }
3961 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3962 pr_err("Unable to recover from unknown"
3963 " opcode, closing iSCSI connection.\n");
3964 return -1;
3965 }
3966 break;
3967 }
3968
3969 return ret;
1aa58ccd
NB		 3970reject:
3971 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 3972}
3973
e48354ce
NB		 3974int iscsi_target_rx_thread(void *arg)
3975{
3976 int ret;
3977 u8 buffer[ISCSI_HDR_LEN], opcode;
3978 u32 checksum = 0, digest = 0;
3979 struct iscsi_conn *conn = NULL;
8359cf43 3980 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3981 struct kvec iov;
3982 /*
3983 * Allow ourselves to be interrupted by SIGINT so that a
3984 * connection recovery / failure event can be triggered externally.
3985 */
3986 allow_signal(SIGINT);
3987
3988restart:
3989 conn = iscsi_rx_thread_pre_handler(ts);
3990 if (!conn)
3991 goto out;
3992
3e1c81a9
NB		 3993 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
3994 struct completion comp;
3995 int rc;
3996
3997 init_completion(&comp);
3998 rc = wait_for_completion_interruptible(&comp);
3999 if (rc < 0)
4000 goto transport_err;
4001
4002 goto out;
4003 }
4004
e48354ce
NB		 4005 while (!kthread_should_stop()) {
4006 /*
4007 * Ensure that both TX and RX per connection kthreads
4008 * are scheduled to run on the same CPU.
4009 */
4010 iscsit_thread_check_cpumask(conn, current, 0);
4011
4012 memset(buffer, 0, ISCSI_HDR_LEN);
4013 memset(&iov, 0, sizeof(struct kvec));
4014
4015 iov.iov_base = buffer;
4016 iov.iov_len = ISCSI_HDR_LEN;
4017
4018 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4019 if (ret != ISCSI_HDR_LEN) {
4020 iscsit_rx_thread_wait_for_tcp(conn);
4021 goto transport_err;
4022 }
4023
4024 /*
4025 * Set conn->bad_hdr for use with REJECT PDUs.
4026 */
4027 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4028
4029 if (conn->conn_ops->HeaderDigest) {
4030 iov.iov_base = &digest;
4031 iov.iov_len = ISCSI_CRC_LEN;
4032
4033 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4034 if (ret != ISCSI_CRC_LEN) {
4035 iscsit_rx_thread_wait_for_tcp(conn);
4036 goto transport_err;
4037 }
4038
4039 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4040 buffer, ISCSI_HDR_LEN,
4041 0, NULL, (u8 *)&checksum);
4042
4043 if (digest != checksum) {
4044 pr_err("HeaderDigest CRC32C failed,"
4045 " received 0x%08x, computed 0x%08x\n",
4046 digest, checksum);
4047 /*
4048 * Set the PDU to 0xff so it will intentionally
4049 * hit default in the switch below.
4050 */
4051 memset(buffer, 0xff, ISCSI_HDR_LEN);
4052 spin_lock_bh(&conn->sess->session_stats_lock);
4053 conn->sess->conn_digest_errors++;
4054 spin_unlock_bh(&conn->sess->session_stats_lock);
4055 } else {
4056 pr_debug("Got HeaderDigest CRC32C"
4057 " 0x%08x\n", checksum);
4058 }
4059 }
4060
4061 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4062 goto transport_err;
4063
4064 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4065
4066 if (conn->sess->sess_ops->SessionType &&
4067 ((!(opcode & ISCSI_OP_TEXT)) ||
4068 (!(opcode & ISCSI_OP_LOGOUT)))) {
4069 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4070 " while in Discovery Session, rejecting.\n", opcode);
1aa58ccd
NB		 4071 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4072 buffer);
e48354ce
NB		 4073 goto transport_err;
4074 }
4075
3e1c81a9
NB		 4076 ret = iscsi_target_rx_opcode(conn, buffer);
4077 if (ret < 0)
4078 goto transport_err;
e48354ce
NB		 4079 }
4080
4081transport_err:
4082 if (!signal_pending(current))
4083 atomic_set(&conn->transport_failed, 1);
4084 iscsit_take_action_for_connection_exit(conn);
4085 goto restart;
4086out:
4087 return 0;
4088}
4089
4090static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4091{
4092 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4093 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4094 /*
4095 * We expect this function to only ever be called from either RX or TX
4096 * thread context via iscsit_close_connection() once the other context
4097 * has been reset -> returned sleeping pre-handler state.
4098 */
4099 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4100 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4101
2fbb471e 4102 list_del(&cmd->i_conn_node);
e48354ce
NB		 4103 spin_unlock_bh(&conn->cmd_lock);
4104
4105 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4106
aafc9d15 4107 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4108
4109 spin_lock_bh(&conn->cmd_lock);
4110 }
4111 spin_unlock_bh(&conn->cmd_lock);
4112}
4113
4114static void iscsit_stop_timers_for_cmds(
4115 struct iscsi_conn *conn)
4116{
4117 struct iscsi_cmd *cmd;
4118
4119 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4120 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4121 if (cmd->data_direction == DMA_TO_DEVICE)
4122 iscsit_stop_dataout_timer(cmd);
4123 }
4124 spin_unlock_bh(&conn->cmd_lock);
4125}
4126
4127int iscsit_close_connection(
4128 struct iscsi_conn *conn)
4129{
4130 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4131 struct iscsi_session *sess = conn->sess;
4132
4133 pr_debug("Closing iSCSI connection CID %hu on SID:"
4134 " %u\n", conn->cid, sess->sid);
4135 /*
4136 * Always up conn_logout_comp just in case the RX Thread is sleeping
4137 * and the logout response never got sent because the connection
4138 * failed.
4139 */
4140 complete(&conn->conn_logout_comp);
4141
4142 iscsi_release_thread_set(conn);
4143
4144 iscsit_stop_timers_for_cmds(conn);
4145 iscsit_stop_nopin_response_timer(conn);
4146 iscsit_stop_nopin_timer(conn);
4147 iscsit_free_queue_reqs_for_conn(conn);
4148
4149 /*
4150 * During Connection recovery drop unacknowledged out of order
4151 * commands for this connection, and prepare the other commands
4152 * for realligence.
4153 *
4154 * During normal operation clear the out of order commands (but
4155 * do not free the struct iscsi_ooo_cmdsn's) and release all
4156 * struct iscsi_cmds.
4157 */
4158 if (atomic_read(&conn->connection_recovery)) {
4159 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4160 iscsit_prepare_cmds_for_realligance(conn);
4161 } else {
4162 iscsit_clear_ooo_cmdsns_for_conn(conn);
4163 iscsit_release_commands_from_conn(conn);
4164 }
4165
4166 /*
4167 * Handle decrementing session or connection usage count if
4168 * a logout response was not able to be sent because the
4169 * connection failed. Fall back to Session Recovery here.
4170 */
4171 if (atomic_read(&conn->conn_logout_remove)) {
4172 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4173 iscsit_dec_conn_usage_count(conn);
4174 iscsit_dec_session_usage_count(sess);
4175 }
4176 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4177 iscsit_dec_conn_usage_count(conn);
4178
4179 atomic_set(&conn->conn_logout_remove, 0);
4180 atomic_set(&sess->session_reinstatement, 0);
4181 atomic_set(&sess->session_fall_back_to_erl0, 1);
4182 }
4183
4184 spin_lock_bh(&sess->conn_lock);
4185 list_del(&conn->conn_list);
4186
4187 /*
4188 * Attempt to let the Initiator know this connection failed by
4189 * sending an Connection Dropped Async Message on another
4190 * active connection.
4191 */
4192 if (atomic_read(&conn->connection_recovery))
4193 iscsit_build_conn_drop_async_message(conn);
4194
4195 spin_unlock_bh(&sess->conn_lock);
4196
4197 /*
4198 * If connection reinstatement is being performed on this connection,
4199 * up the connection reinstatement semaphore that is being blocked on
4200 * in iscsit_cause_connection_reinstatement().
4201 */
4202 spin_lock_bh(&conn->state_lock);
4203 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4204 spin_unlock_bh(&conn->state_lock);
4205 complete(&conn->conn_wait_comp);
4206 wait_for_completion(&conn->conn_post_wait_comp);
4207 spin_lock_bh(&conn->state_lock);
4208 }
4209
4210 /*
4211 * If connection reinstatement is being performed on this connection
4212 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4213 * connection wait rcfr semaphore that is being blocked on
4214 * an iscsit_connection_reinstatement_rcfr().
4215 */
4216 if (atomic_read(&conn->connection_wait_rcfr)) {
4217 spin_unlock_bh(&conn->state_lock);
4218 complete(&conn->conn_wait_rcfr_comp);
4219 wait_for_completion(&conn->conn_post_wait_comp);
4220 spin_lock_bh(&conn->state_lock);
4221 }
4222 atomic_set(&conn->connection_reinstatement, 1);
4223 spin_unlock_bh(&conn->state_lock);
4224
4225 /*
4226 * If any other processes are accessing this connection pointer we
4227 * must wait until they have completed.
4228 */
4229 iscsit_check_conn_usage_count(conn);
4230
4231 if (conn->conn_rx_hash.tfm)
4232 crypto_free_hash(conn->conn_rx_hash.tfm);
4233 if (conn->conn_tx_hash.tfm)
4234 crypto_free_hash(conn->conn_tx_hash.tfm);
4235
4236 if (conn->conn_cpumask)
4237 free_cpumask_var(conn->conn_cpumask);
4238
4239 kfree(conn->conn_ops);
4240 conn->conn_ops = NULL;
4241
bf6932f4 4242 if (conn->sock)
e48354ce 4243 sock_release(conn->sock);
baa4d64b
NB		 4244
4245 if (conn->conn_transport->iscsit_free_conn)
4246 conn->conn_transport->iscsit_free_conn(conn);
4247
4248 iscsit_put_transport(conn->conn_transport);
4249
e48354ce
NB		 4250 conn->thread_set = NULL;
4251
4252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4253 conn->conn_state = TARG_CONN_STATE_FREE;
4254 kfree(conn);
4255
4256 spin_lock_bh(&sess->conn_lock);
4257 atomic_dec(&sess->nconn);
4258 pr_debug("Decremented iSCSI connection count to %hu from node:"
4259 " %s\n", atomic_read(&sess->nconn),
4260 sess->sess_ops->InitiatorName);
4261 /*
4262 * Make sure that if one connection fails in an non ERL=2 iSCSI
4263 * Session that they all fail.
4264 */
4265 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4266 !atomic_read(&sess->session_logout))
4267 atomic_set(&sess->session_fall_back_to_erl0, 1);
4268
4269 /*
4270 * If this was not the last connection in the session, and we are
4271 * performing session reinstatement or falling back to ERL=0, call
4272 * iscsit_stop_session() without sleeping to shutdown the other
4273 * active connections.
4274 */
4275 if (atomic_read(&sess->nconn)) {
4276 if (!atomic_read(&sess->session_reinstatement) &&
4277 !atomic_read(&sess->session_fall_back_to_erl0)) {
4278 spin_unlock_bh(&sess->conn_lock);
4279 return 0;
4280 }
4281 if (!atomic_read(&sess->session_stop_active)) {
4282 atomic_set(&sess->session_stop_active, 1);
4283 spin_unlock_bh(&sess->conn_lock);
4284 iscsit_stop_session(sess, 0, 0);
4285 return 0;
4286 }
4287 spin_unlock_bh(&sess->conn_lock);
4288 return 0;
4289 }
4290
4291 /*
4292 * If this was the last connection in the session and one of the
4293 * following is occurring:
4294 *
4295 * Session Reinstatement is not being performed, and are falling back
4296 * to ERL=0 call iscsit_close_session().
4297 *
4298 * Session Logout was requested. iscsit_close_session() will be called
4299 * elsewhere.
4300 *
4301 * Session Continuation is not being performed, start the Time2Retain
4302 * handler and check if sleep_on_sess_wait_sem is active.
4303 */
4304 if (!atomic_read(&sess->session_reinstatement) &&
4305 atomic_read(&sess->session_fall_back_to_erl0)) {
4306 spin_unlock_bh(&sess->conn_lock);
99367f01 4307 target_put_session(sess->se_sess);
e48354ce
NB		 4308
4309 return 0;
4310 } else if (atomic_read(&sess->session_logout)) {
4311 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4312 sess->session_state = TARG_SESS_STATE_FREE;
4313 spin_unlock_bh(&sess->conn_lock);
4314
4315 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4316 complete(&sess->session_wait_comp);
4317
4318 return 0;
4319 } else {
4320 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4321 sess->session_state = TARG_SESS_STATE_FAILED;
4322
4323 if (!atomic_read(&sess->session_continuation)) {
4324 spin_unlock_bh(&sess->conn_lock);
4325 iscsit_start_time2retain_handler(sess);
4326 } else
4327 spin_unlock_bh(&sess->conn_lock);
4328
4329 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4330 complete(&sess->session_wait_comp);
4331
4332 return 0;
4333 }
4334 spin_unlock_bh(&sess->conn_lock);
4335
4336 return 0;
4337}
4338
4339int iscsit_close_session(struct iscsi_session *sess)
4340{
4341 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4342 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4343
4344 if (atomic_read(&sess->nconn)) {
4345 pr_err("%d connection(s) still exist for iSCSI session"
4346 " to %s\n", atomic_read(&sess->nconn),
4347 sess->sess_ops->InitiatorName);
4348 BUG();
4349 }
4350
4351 spin_lock_bh(&se_tpg->session_lock);
4352 atomic_set(&sess->session_logout, 1);
4353 atomic_set(&sess->session_reinstatement, 1);
4354 iscsit_stop_time2retain_timer(sess);
4355 spin_unlock_bh(&se_tpg->session_lock);
4356
4357 /*
4358 * transport_deregister_session_configfs() will clear the
4359 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4360 * can be setting it again with __transport_register_session() in
4361 * iscsi_post_login_handler() again after the iscsit_stop_session()
4362 * completes in iscsi_np context.
4363 */
4364 transport_deregister_session_configfs(sess->se_sess);
4365
4366 /*
4367 * If any other processes are accessing this session pointer we must
4368 * wait until they have completed. If we are in an interrupt (the
4369 * time2retain handler) and contain and active session usage count we
4370 * restart the timer and exit.
4371 */
4372 if (!in_interrupt()) {
4373 if (iscsit_check_session_usage_count(sess) == 1)
4374 iscsit_stop_session(sess, 1, 1);
4375 } else {
4376 if (iscsit_check_session_usage_count(sess) == 2) {
4377 atomic_set(&sess->session_logout, 0);
4378 iscsit_start_time2retain_handler(sess);
4379 return 0;
4380 }
4381 }
4382
4383 transport_deregister_session(sess->se_sess);
4384
4385 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4386 iscsit_free_connection_recovery_entires(sess);
4387
4388 iscsit_free_all_ooo_cmdsns(sess);
4389
4390 spin_lock_bh(&se_tpg->session_lock);
4391 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4392 sess->session_state = TARG_SESS_STATE_FREE;
4393 pr_debug("Released iSCSI session from node: %s\n",
4394 sess->sess_ops->InitiatorName);
4395 tpg->nsessions--;
4396 if (tpg->tpg_tiqn)
4397 tpg->tpg_tiqn->tiqn_nsessions--;
4398
4399 pr_debug("Decremented number of active iSCSI Sessions on"
4400 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4401
4402 spin_lock(&sess_idr_lock);
4403 idr_remove(&sess_idr, sess->session_index);
4404 spin_unlock(&sess_idr_lock);
4405
4406 kfree(sess->sess_ops);
4407 sess->sess_ops = NULL;
4408 spin_unlock_bh(&se_tpg->session_lock);
4409
4410 kfree(sess);
4411 return 0;
4412}
4413
4414static void iscsit_logout_post_handler_closesession(
4415 struct iscsi_conn *conn)
4416{
4417 struct iscsi_session *sess = conn->sess;
4418
4419 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4420 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4421
4422 atomic_set(&conn->conn_logout_remove, 0);
4423 complete(&conn->conn_logout_comp);
4424
4425 iscsit_dec_conn_usage_count(conn);
4426 iscsit_stop_session(sess, 1, 1);
4427 iscsit_dec_session_usage_count(sess);
99367f01 4428 target_put_session(sess->se_sess);
e48354ce
NB		 4429}
4430
4431static void iscsit_logout_post_handler_samecid(
4432 struct iscsi_conn *conn)
4433{
4434 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4435 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4436
4437 atomic_set(&conn->conn_logout_remove, 0);
4438 complete(&conn->conn_logout_comp);
4439
4440 iscsit_cause_connection_reinstatement(conn, 1);
4441 iscsit_dec_conn_usage_count(conn);
4442}
4443
4444static void iscsit_logout_post_handler_diffcid(
4445 struct iscsi_conn *conn,
4446 u16 cid)
4447{
4448 struct iscsi_conn *l_conn;
4449 struct iscsi_session *sess = conn->sess;
4450
4451 if (!sess)
4452 return;
4453
4454 spin_lock_bh(&sess->conn_lock);
4455 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4456 if (l_conn->cid == cid) {
4457 iscsit_inc_conn_usage_count(l_conn);
4458 break;
4459 }
4460 }
4461 spin_unlock_bh(&sess->conn_lock);
4462
4463 if (!l_conn)
4464 return;
4465
4466 if (l_conn->sock)
4467 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4468
4469 spin_lock_bh(&l_conn->state_lock);
4470 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4471 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4472 spin_unlock_bh(&l_conn->state_lock);
4473
4474 iscsit_cause_connection_reinstatement(l_conn, 1);
4475 iscsit_dec_conn_usage_count(l_conn);
4476}
4477
4478/*
4479 * Return of 0 causes the TX thread to restart.
4480 */
2ec5a8c1 4481int iscsit_logout_post_handler(
e48354ce
NB		 4482 struct iscsi_cmd *cmd,
4483 struct iscsi_conn *conn)
4484{
4485 int ret = 0;
4486
4487 switch (cmd->logout_reason) {
4488 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4489 switch (cmd->logout_response) {
4490 case ISCSI_LOGOUT_SUCCESS:
4491 case ISCSI_LOGOUT_CLEANUP_FAILED:
4492 default:
4493 iscsit_logout_post_handler_closesession(conn);
4494 break;
4495 }
4496 ret = 0;
4497 break;
4498 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4499 if (conn->cid == cmd->logout_cid) {
4500 switch (cmd->logout_response) {
4501 case ISCSI_LOGOUT_SUCCESS:
4502 case ISCSI_LOGOUT_CLEANUP_FAILED:
4503 default:
4504 iscsit_logout_post_handler_samecid(conn);
4505 break;
4506 }
4507 ret = 0;
4508 } else {
4509 switch (cmd->logout_response) {
4510 case ISCSI_LOGOUT_SUCCESS:
4511 iscsit_logout_post_handler_diffcid(conn,
4512 cmd->logout_cid);
4513 break;
4514 case ISCSI_LOGOUT_CID_NOT_FOUND:
4515 case ISCSI_LOGOUT_CLEANUP_FAILED:
4516 default:
4517 break;
4518 }
4519 ret = 1;
4520 }
4521 break;
4522 case ISCSI_LOGOUT_REASON_RECOVERY:
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 case ISCSI_LOGOUT_CID_NOT_FOUND:
4526 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4527 case ISCSI_LOGOUT_CLEANUP_FAILED:
4528 default:
4529 break;
4530 }
4531 ret = 1;
4532 break;
4533 default:
4534 break;
4535
4536 }
4537 return ret;
4538}
2ec5a8c1 4539EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4540
4541void iscsit_fail_session(struct iscsi_session *sess)
4542{
4543 struct iscsi_conn *conn;
4544
4545 spin_lock_bh(&sess->conn_lock);
4546 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4547 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4548 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4549 }
4550 spin_unlock_bh(&sess->conn_lock);
4551
4552 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4553 sess->session_state = TARG_SESS_STATE_FAILED;
4554}
4555
4556int iscsit_free_session(struct iscsi_session *sess)
4557{
4558 u16 conn_count = atomic_read(&sess->nconn);
4559 struct iscsi_conn *conn, *conn_tmp = NULL;
4560 int is_last;
4561
4562 spin_lock_bh(&sess->conn_lock);
4563 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4564
4565 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4566 conn_list) {
4567 if (conn_count == 0)
4568 break;
4569
4570 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4571 is_last = 1;
4572 } else {
4573 iscsit_inc_conn_usage_count(conn_tmp);
4574 is_last = 0;
4575 }
4576 iscsit_inc_conn_usage_count(conn);
4577
4578 spin_unlock_bh(&sess->conn_lock);
4579 iscsit_cause_connection_reinstatement(conn, 1);
4580 spin_lock_bh(&sess->conn_lock);
4581
4582 iscsit_dec_conn_usage_count(conn);
4583 if (is_last == 0)
4584 iscsit_dec_conn_usage_count(conn_tmp);
4585
4586 conn_count--;
4587 }
4588
4589 if (atomic_read(&sess->nconn)) {
4590 spin_unlock_bh(&sess->conn_lock);
4591 wait_for_completion(&sess->session_wait_comp);
4592 } else
4593 spin_unlock_bh(&sess->conn_lock);
4594
99367f01 4595 target_put_session(sess->se_sess);
e48354ce
NB		 4596 return 0;
4597}
4598
4599void iscsit_stop_session(
4600 struct iscsi_session *sess,
4601 int session_sleep,
4602 int connection_sleep)
4603{
4604 u16 conn_count = atomic_read(&sess->nconn);
4605 struct iscsi_conn *conn, *conn_tmp = NULL;
4606 int is_last;
4607
4608 spin_lock_bh(&sess->conn_lock);
4609 if (session_sleep)
4610 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4611
4612 if (connection_sleep) {
4613 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4614 conn_list) {
4615 if (conn_count == 0)
4616 break;
4617
4618 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4619 is_last = 1;
4620 } else {
4621 iscsit_inc_conn_usage_count(conn_tmp);
4622 is_last = 0;
4623 }
4624 iscsit_inc_conn_usage_count(conn);
4625
4626 spin_unlock_bh(&sess->conn_lock);
4627 iscsit_cause_connection_reinstatement(conn, 1);
4628 spin_lock_bh(&sess->conn_lock);
4629
4630 iscsit_dec_conn_usage_count(conn);
4631 if (is_last == 0)
4632 iscsit_dec_conn_usage_count(conn_tmp);
4633 conn_count--;
4634 }
4635 } else {
4636 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4637 iscsit_cause_connection_reinstatement(conn, 0);
4638 }
4639
4640 if (session_sleep && atomic_read(&sess->nconn)) {
4641 spin_unlock_bh(&sess->conn_lock);
4642 wait_for_completion(&sess->session_wait_comp);
4643 } else
4644 spin_unlock_bh(&sess->conn_lock);
4645}
4646
4647int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4648{
4649 struct iscsi_session *sess;
4650 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4651 struct se_session *se_sess, *se_sess_tmp;
4652 int session_count = 0;
4653
4654 spin_lock_bh(&se_tpg->session_lock);
4655 if (tpg->nsessions && !force) {
4656 spin_unlock_bh(&se_tpg->session_lock);
4657 return -1;
4658 }
4659
4660 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4661 sess_list) {
4662 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4663
4664 spin_lock(&sess->conn_lock);
4665 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4666 atomic_read(&sess->session_logout) ||
4667 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4668 spin_unlock(&sess->conn_lock);
4669 continue;
4670 }
4671 atomic_set(&sess->session_reinstatement, 1);
4672 spin_unlock(&sess->conn_lock);
4673 spin_unlock_bh(&se_tpg->session_lock);
4674
4675 iscsit_free_session(sess);
4676 spin_lock_bh(&se_tpg->session_lock);
4677
4678 session_count++;
4679 }
4680 spin_unlock_bh(&se_tpg->session_lock);
4681
4682 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4683 " Group: %hu\n", session_count, tpg->tpgt);
4684 return 0;
4685}
4686
4687MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4688MODULE_VERSION("4.1.x");
4689MODULE_AUTHOR("nab@Linux-iSCSI.org");
4690MODULE_LICENSE("GPL");
4691
4692module_init(iscsi_target_init_module);
4693module_exit(iscsi_target_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)