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Merge tag 'v3.10.73' into update
[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) {
96f27d26 463 np->enabled = true;
e48354ce
NB		 464 spin_unlock_bh(&np->np_thread_lock);
465 return 0;
466 }
467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
468 spin_unlock_bh(&np->np_thread_lock);
469
470 if (np->np_thread) {
471 /*
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
474 */
475 send_sig(SIGINT, np->np_thread, 1);
476 kthread_stop(np->np_thread);
477 }
baa4d64b
NB		 478
479 np->np_transport->iscsit_free_np(np);
e48354ce 480
85c3c54b 481 mutex_lock(&np_lock);
e48354ce 482 list_del(&np->np_list);
85c3c54b 483 mutex_unlock(&np_lock);
e48354ce
NB		 484
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 486 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 487
baa4d64b 488 iscsit_put_transport(np->np_transport);
e48354ce
NB		 489 kfree(np);
490 return 0;
491}
492
2ec5a8c1
NB		 493static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495
496static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497{
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
499 return 0;
500}
501
baa4d64b
NB		 502static struct iscsit_transport iscsi_target_transport = {
503 .name = "iSCSI/TCP",
504 .transport_type = ISCSI_TCP,
505 .owner = NULL,
506 .iscsit_setup_np = iscsit_setup_np,
507 .iscsit_accept_np = iscsit_accept_np,
508 .iscsit_free_np = iscsit_free_np,
cdb72665 509 .iscsit_alloc_cmd = iscsit_alloc_cmd,
baa4d64b
NB		 510 .iscsit_get_login_rx = iscsit_get_login_rx,
511 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 512 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 513 .iscsit_immediate_queue = iscsit_immediate_queue,
514 .iscsit_response_queue = iscsit_response_queue,
515 .iscsit_queue_data_in = iscsit_queue_rsp,
516 .iscsit_queue_status = iscsit_queue_rsp,
baa4d64b
NB		 517};
518
e48354ce
NB		 519static int __init iscsi_target_init_module(void)
520{
521 int ret = 0;
522
523 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
524
525 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
526 if (!iscsit_global) {
527 pr_err("Unable to allocate memory for iscsit_global\n");
528 return -1;
529 }
530 mutex_init(&auth_id_lock);
531 spin_lock_init(&sess_idr_lock);
532 idr_init(&tiqn_idr);
533 idr_init(&sess_idr);
534
535 ret = iscsi_target_register_configfs();
536 if (ret < 0)
537 goto out;
538
539 ret = iscsi_thread_set_init();
540 if (ret < 0)
541 goto configfs_out;
542
543 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
544 TARGET_THREAD_SET_COUNT) {
545 pr_err("iscsi_allocate_thread_sets() returned"
546 " unexpected value!\n");
547 goto ts_out1;
548 }
549
550 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
551 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
552 0, NULL);
553 if (!lio_cmd_cache) {
554 pr_err("Unable to kmem_cache_create() for"
555 " lio_cmd_cache\n");
556 goto ts_out2;
557 }
558
559 lio_qr_cache = kmem_cache_create("lio_qr_cache",
560 sizeof(struct iscsi_queue_req),
561 __alignof__(struct iscsi_queue_req), 0, NULL);
562 if (!lio_qr_cache) {
563 pr_err("nable to kmem_cache_create() for"
564 " lio_qr_cache\n");
565 goto cmd_out;
566 }
567
568 lio_dr_cache = kmem_cache_create("lio_dr_cache",
569 sizeof(struct iscsi_datain_req),
570 __alignof__(struct iscsi_datain_req), 0, NULL);
571 if (!lio_dr_cache) {
572 pr_err("Unable to kmem_cache_create() for"
573 " lio_dr_cache\n");
574 goto qr_out;
575 }
576
577 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
578 sizeof(struct iscsi_ooo_cmdsn),
579 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
580 if (!lio_ooo_cache) {
581 pr_err("Unable to kmem_cache_create() for"
582 " lio_ooo_cache\n");
583 goto dr_out;
584 }
585
586 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
587 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
588 0, NULL);
589 if (!lio_r2t_cache) {
590 pr_err("Unable to kmem_cache_create() for"
591 " lio_r2t_cache\n");
592 goto ooo_out;
593 }
594
baa4d64b
NB		 595 iscsit_register_transport(&iscsi_target_transport);
596
e48354ce
NB		 597 if (iscsit_load_discovery_tpg() < 0)
598 goto r2t_out;
599
600 return ret;
601r2t_out:
602 kmem_cache_destroy(lio_r2t_cache);
603ooo_out:
604 kmem_cache_destroy(lio_ooo_cache);
605dr_out:
606 kmem_cache_destroy(lio_dr_cache);
607qr_out:
608 kmem_cache_destroy(lio_qr_cache);
609cmd_out:
610 kmem_cache_destroy(lio_cmd_cache);
611ts_out2:
612 iscsi_deallocate_thread_sets();
613ts_out1:
614 iscsi_thread_set_free();
615configfs_out:
616 iscsi_target_deregister_configfs();
617out:
618 kfree(iscsit_global);
619 return -ENOMEM;
620}
621
622static void __exit iscsi_target_cleanup_module(void)
623{
624 iscsi_deallocate_thread_sets();
625 iscsi_thread_set_free();
626 iscsit_release_discovery_tpg();
baa4d64b 627 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 628 kmem_cache_destroy(lio_cmd_cache);
629 kmem_cache_destroy(lio_qr_cache);
630 kmem_cache_destroy(lio_dr_cache);
631 kmem_cache_destroy(lio_ooo_cache);
632 kmem_cache_destroy(lio_r2t_cache);
633
634 iscsi_target_deregister_configfs();
635
636 kfree(iscsit_global);
637}
638
8b1e1244 639static int iscsit_add_reject(
1aa58ccd 640 struct iscsi_conn *conn,
e48354ce 641 u8 reason,
1aa58ccd 642 unsigned char *buf)
e48354ce
NB		 643{
644 struct iscsi_cmd *cmd;
e48354ce
NB		 645
646 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
647 if (!cmd)
648 return -1;
649
650 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 651 cmd->reject_reason = reason;
e48354ce 652
1c3d5794 653 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 654 if (!cmd->buf_ptr) {
655 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 656 iscsit_free_cmd(cmd, false);
e48354ce
NB		 657 return -1;
658 }
e48354ce
NB		 659
660 spin_lock_bh(&conn->cmd_lock);
2fbb471e 661 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 662 spin_unlock_bh(&conn->cmd_lock);
663
664 cmd->i_state = ISTATE_SEND_REJECT;
665 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
666
1aa58ccd 667 return -1;
e48354ce
NB		 668}
669
1aa58ccd
NB		 670static int iscsit_add_reject_from_cmd(
671 struct iscsi_cmd *cmd,
e48354ce 672 u8 reason,
1aa58ccd
NB		 673 bool add_to_conn,
674 unsigned char *buf)
e48354ce
NB		 675{
676 struct iscsi_conn *conn;
e48354ce
NB		 677
678 if (!cmd->conn) {
679 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
680 cmd->init_task_tag);
681 return -1;
682 }
683 conn = cmd->conn;
684
685 cmd->iscsi_opcode = ISCSI_OP_REJECT;
1aa58ccd 686 cmd->reject_reason = reason;
e48354ce 687
1c3d5794 688 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 689 if (!cmd->buf_ptr) {
690 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 691 iscsit_free_cmd(cmd, false);
e48354ce
NB		 692 return -1;
693 }
e48354ce
NB		 694
695 if (add_to_conn) {
696 spin_lock_bh(&conn->cmd_lock);
2fbb471e 697 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 698 spin_unlock_bh(&conn->cmd_lock);
699 }
700
701 cmd->i_state = ISTATE_SEND_REJECT;
702 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 703 /*
704 * Perform the kref_put now if se_cmd has already been setup by
705 * scsit_setup_scsi_cmd()
706 */
707 if (cmd->se_cmd.se_tfo != NULL) {
708 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
709 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
710 }
1aa58ccd
NB		 711 return -1;
712}
713
714static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
715 unsigned char *buf)
716{
717 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
718}
e48354ce 719
1aa58ccd
NB		 720int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
721{
722 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 723}
724
725/*
726 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 727 * kernel sockets to copy data in/out.
e48354ce
NB		 728 */
729static int iscsit_map_iovec(
730 struct iscsi_cmd *cmd,
731 struct kvec *iov,
732 u32 data_offset,
733 u32 data_length)
734{
735 u32 i = 0;
736 struct scatterlist *sg;
737 unsigned int page_off;
738
739 /*
bfb79eac 740 * We know each entry in t_data_sg contains a page.
e48354ce 741 */
bfb79eac 742 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 743 page_off = (data_offset % PAGE_SIZE);
744
745 cmd->first_data_sg = sg;
746 cmd->first_data_sg_off = page_off;
747
748 while (data_length) {
749 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
750
751 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
752 iov[i].iov_len = cur_len;
753
754 data_length -= cur_len;
755 page_off = 0;
756 sg = sg_next(sg);
757 i++;
758 }
759
760 cmd->kmapped_nents = i;
761
762 return i;
763}
764
765static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
766{
767 u32 i;
768 struct scatterlist *sg;
769
770 sg = cmd->first_data_sg;
771
772 for (i = 0; i < cmd->kmapped_nents; i++)
773 kunmap(sg_page(&sg[i]));
774}
775
776static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
777{
778 struct iscsi_cmd *cmd;
779
780 conn->exp_statsn = exp_statsn;
781
3e1c81a9
NB		 782 if (conn->sess->sess_ops->RDMAExtensions)
783 return;
784
e48354ce 785 spin_lock_bh(&conn->cmd_lock);
2fbb471e 786 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 787 spin_lock(&cmd->istate_lock);
788 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 789 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 790 cmd->i_state = ISTATE_REMOVE;
791 spin_unlock(&cmd->istate_lock);
792 iscsit_add_cmd_to_immediate_queue(cmd, conn,
793 cmd->i_state);
794 continue;
795 }
796 spin_unlock(&cmd->istate_lock);
797 }
798 spin_unlock_bh(&conn->cmd_lock);
799}
800
801static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
802{
f80e8ed3 803 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 804
c0427f15 805 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 806
807 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
808 if (!cmd->iov_data) {
809 pr_err("Unable to allocate cmd->iov_data\n");
810 return -ENOMEM;
811 }
812
813 cmd->orig_iov_data_count = iov_count;
814 return 0;
815}
816
3e1c81a9
NB		 817int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
818 unsigned char *buf)
e48354ce 819{
3e1c81a9 820 int data_direction, payload_length;
e48354ce 821 struct iscsi_scsi_req *hdr;
d28b1169
AG		 822 int iscsi_task_attr;
823 int sam_task_attr;
e48354ce
NB		 824
825 spin_lock_bh(&conn->sess->session_stats_lock);
826 conn->sess->cmd_pdus++;
827 if (conn->sess->se_sess->se_node_acl) {
828 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
829 conn->sess->se_sess->se_node_acl->num_cmds++;
830 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
831 }
832 spin_unlock_bh(&conn->sess->session_stats_lock);
833
834 hdr = (struct iscsi_scsi_req *) buf;
835 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 836
837 /* FIXME; Add checks for AdditionalHeaderSegment */
838
839 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
840 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
841 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
842 " not set. Bad iSCSI Initiator.\n");
1aa58ccd
NB		 843 return iscsit_add_reject_cmd(cmd,
844 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 845 }
846
847 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
848 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
849 /*
42ea20ee
NB		 850 * From RFC-3720 Section 10.3.1:
851 *
852 * "Either or both of R and W MAY be 1 when either the
853 * Expected Data Transfer Length and/or Bidirectional Read
854 * Expected Data Transfer Length are 0"
855 *
856 * For this case, go ahead and clear the unnecssary bits
857 * to avoid any confusion with ->data_direction.
e48354ce 858 */
42ea20ee
NB		 859 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
860 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 861
42ea20ee 862 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 863 " set when Expected Data Transfer Length is 0 for"
42ea20ee 864 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 865 }
e48354ce
NB		 866
867 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
868 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
869 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
870 " MUST be set if Expected Data Transfer Length is not 0."
871 " Bad iSCSI Initiator\n");
1aa58ccd
NB		 872 return iscsit_add_reject_cmd(cmd,
873 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 874 }
875
876 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
877 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
878 pr_err("Bidirectional operations not supported!\n");
1aa58ccd
NB		 879 return iscsit_add_reject_cmd(cmd,
880 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 881 }
882
883 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
884 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
885 " Scsi Command PDU.\n");
1aa58ccd
NB		 886 return iscsit_add_reject_cmd(cmd,
887 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 888 }
889
890 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
891 pr_err("ImmediateData=No but DataSegmentLength=%u,"
892 " protocol error.\n", payload_length);
1aa58ccd
NB		 893 return iscsit_add_reject_cmd(cmd,
894 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 895 }
896
1aa58ccd 897 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 898 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
899 pr_err("Expected Data Transfer Length and Length of"
900 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
901 " bit is not set protocol error\n");
1aa58ccd
NB		 902 return iscsit_add_reject_cmd(cmd,
903 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 904 }
905
50e5c87d 906 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 907 pr_err("DataSegmentLength: %u is greater than"
908 " EDTL: %u, protocol error.\n", payload_length,
909 hdr->data_length);
1aa58ccd
NB		 910 return iscsit_add_reject_cmd(cmd,
911 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 912 }
913
21f5aa7e 914 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 915 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 916 " MaxXmitDataSegmentLength: %u, protocol error.\n",
917 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 918 return iscsit_add_reject_cmd(cmd,
919 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 920 }
921
922 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
923 pr_err("DataSegmentLength: %u is greater than"
924 " FirstBurstLength: %u, protocol error.\n",
925 payload_length, conn->sess->sess_ops->FirstBurstLength);
1aa58ccd
NB		 926 return iscsit_add_reject_cmd(cmd,
927 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 928 }
929
930 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
931 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
932 DMA_NONE;
933
d28b1169 934 cmd->data_direction = data_direction;
d28b1169
AG		 935 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
936 /*
937 * Figure out the SAM Task Attribute for the incoming SCSI CDB
938 */
939 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
940 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
941 sam_task_attr = MSG_SIMPLE_TAG;
942 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
943 sam_task_attr = MSG_ORDERED_TAG;
944 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
945 sam_task_attr = MSG_HEAD_TAG;
946 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
947 sam_task_attr = MSG_ACA_TAG;
948 else {
949 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
950 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
951 sam_task_attr = MSG_SIMPLE_TAG;
952 }
953
e48354ce
NB		 954 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
955 cmd->i_state = ISTATE_NEW_CMD;
956 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
957 cmd->immediate_data = (payload_length) ? 1 : 0;
958 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
959 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
960 if (cmd->unsolicited_data)
961 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
962
963 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
964 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
965 spin_lock_bh(&conn->sess->ttt_lock);
966 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
967 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
968 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
969 spin_unlock_bh(&conn->sess->ttt_lock);
970 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
971 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 972 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
973 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 974 cmd->first_burst_len = payload_length;
975
3e1c81a9
NB		 976 if (!conn->sess->sess_ops->RDMAExtensions &&
977 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 978 struct iscsi_datain_req *dr;
979
980 dr = iscsit_allocate_datain_req();
981 if (!dr)
1aa58ccd
NB		 982 return iscsit_add_reject_cmd(cmd,
983 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 984
985 iscsit_attach_datain_req(cmd, dr);
986 }
987
065ca1e4
AG		 988 /*
989 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
990 */
991 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 992 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
993 cmd->data_direction, sam_task_attr,
994 cmd->sense_buffer + 2);
065ca1e4
AG		 995
996 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
997 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 998 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
999 conn->cid);
1000
1001 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 1002
de103c93
CH		 1003 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1004 scsilun_to_int(&hdr->lun));
1005 if (cmd->sense_reason)
1006 goto attach_cmd;
1007
1008 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1009 if (cmd->sense_reason) {
1010 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1aa58ccd
NB		 1011 return iscsit_add_reject_cmd(cmd,
1012 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1013 }
de103c93 1014
e48354ce
NB		 1015 goto attach_cmd;
1016 }
a12f41f8 1017
de103c93 1018 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1aa58ccd
NB		 1019 return iscsit_add_reject_cmd(cmd,
1020 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1021 }
1022
1023attach_cmd:
1024 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1025 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1026 spin_unlock_bh(&conn->cmd_lock);
1027 /*
1028 * Check if we need to delay processing because of ALUA
1029 * Active/NonOptimized primary access state..
1030 */
1031 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1032
3e1c81a9
NB		 1033 return 0;
1034}
1035EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1036
3e1c81a9
NB		 1037void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1038{
1039 iscsit_set_dataout_sequence_values(cmd);
1040
1041 spin_lock_bh(&cmd->dataout_timeout_lock);
1042 iscsit_start_dataout_timer(cmd, cmd->conn);
1043 spin_unlock_bh(&cmd->dataout_timeout_lock);
1044}
1045EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1046
1047int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1048 struct iscsi_scsi_req *hdr)
1049{
1050 int cmdsn_ret = 0;
e48354ce
NB		 1051 /*
1052 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1053 * the Immediate Bit is not set, and no Immediate
1054 * Data is attached.
1055 *
1056 * A PDU/CmdSN carrying Immediate Data can only
1057 * be processed after the DataCRC has passed.
1058 * If the DataCRC fails, the CmdSN MUST NOT
1059 * be acknowledged. (See below)
1060 */
1061 if (!cmd->immediate_data) {
adb97c29
NB		 1062 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1063 (unsigned char *)hdr, hdr->cmdsn);
1064 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1065 return -1;
1066 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1067 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1068 return 0;
3e1c81a9 1069 }
e48354ce
NB		 1070 }
1071
50e5c87d 1072 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1073
1074 /*
1075 * If no Immediate Data is attached, it's OK to return now.
1076 */
1077 if (!cmd->immediate_data) {
3e1c81a9
NB		 1078 if (!cmd->sense_reason && cmd->unsolicited_data)
1079 iscsit_set_unsoliticed_dataout(cmd);
1080 if (!cmd->sense_reason)
1081 return 0;
e48354ce 1082
3e1c81a9 1083 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1084 return 0;
1085 }
1086
1087 /*
3e1c81a9
NB		 1088 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1089 * execution. These exceptions are processed in CmdSN order using
1090 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1091 */
de103c93 1092 if (cmd->sense_reason) {
adb97c29
NB		 1093 if (cmd->reject_reason)
1094 return 0;
1095
3e1c81a9 1096 return 1;
e48354ce
NB		 1097 }
1098 /*
1099 * Call directly into transport_generic_new_cmd() to perform
1100 * the backend memory allocation.
1101 */
de103c93 1102 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
adb97c29 1103 if (cmd->sense_reason)
3e1c81a9 1104 return 1;
e48354ce 1105
3e1c81a9
NB		 1106 return 0;
1107}
1108EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1109
1110static int
1111iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1112 bool dump_payload)
1113{
adb97c29 1114 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1115 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1116 /*
1117 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1118 */
1119 if (dump_payload == true)
1120 goto after_immediate_data;
1121
1122 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1123 cmd->first_burst_len);
e48354ce
NB		 1124after_immediate_data:
1125 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1126 /*
1127 * A PDU/CmdSN carrying Immediate Data passed
1128 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1129 * Immediate Bit is not set.
1130 */
adb97c29
NB		 1131 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1132 (unsigned char *)hdr, hdr->cmdsn);
ce799c71 1133 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
adb97c29 1134 return -1;
3e1c81a9 1135
ce799c71 1136 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
adb97c29
NB		 1137 int rc;
1138
1139 rc = iscsit_dump_data_payload(cmd->conn,
1140 cmd->first_burst_len, 1);
1141 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1142 return rc;
3e1c81a9
NB		 1143 } else if (cmd->unsolicited_data)
1144 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1145
e48354ce
NB		 1146 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1147 /*
1148 * Immediate Data failed DataCRC and ERL>=1,
1149 * silently drop this PDU and let the initiator
1150 * plug the CmdSN gap.
1151 *
1152 * FIXME: Send Unsolicited NOPIN with reserved
1153 * TTT here to help the initiator figure out
1154 * the missing CmdSN, although they should be
1155 * intelligent enough to determine the missing
1156 * CmdSN and issue a retry to plug the sequence.
1157 */
1158 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1159 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1160 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1161 return -1;
1162
1163 return 0;
1164}
1165
3e1c81a9
NB		 1166static int
1167iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1168 unsigned char *buf)
1169{
1170 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1171 int rc, immed_data;
1172 bool dump_payload = false;
1173
1174 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1175 if (rc < 0)
adb97c29 1176 return 0;
3e1c81a9
NB		 1177 /*
1178 * Allocation iovecs needed for struct socket operations for
1179 * traditional iSCSI block I/O.
1180 */
1181 if (iscsit_allocate_iovecs(cmd) < 0) {
1aa58ccd
NB		 1182 return iscsit_add_reject_cmd(cmd,
1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1184 }
1185 immed_data = cmd->immediate_data;
1186
1187 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1188 if (rc < 0)
1189 return rc;
1190 else if (rc > 0)
1191 dump_payload = true;
1192
1193 if (!immed_data)
1194 return 0;
1195
1196 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1197}
1198
e48354ce
NB		 1199static u32 iscsit_do_crypto_hash_sg(
1200 struct hash_desc *hash,
1201 struct iscsi_cmd *cmd,
1202 u32 data_offset,
1203 u32 data_length,
1204 u32 padding,
1205 u8 *pad_bytes)
1206{
1207 u32 data_crc;
1208 u32 i;
1209 struct scatterlist *sg;
1210 unsigned int page_off;
1211
1212 crypto_hash_init(hash);
1213
1214 sg = cmd->first_data_sg;
1215 page_off = cmd->first_data_sg_off;
1216
1217 i = 0;
1218 while (data_length) {
1219 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1220
1221 crypto_hash_update(hash, &sg[i], cur_len);
1222
1223 data_length -= cur_len;
1224 page_off = 0;
1225 i++;
1226 }
1227
1228 if (padding) {
1229 struct scatterlist pad_sg;
1230
1231 sg_init_one(&pad_sg, pad_bytes, padding);
1232 crypto_hash_update(hash, &pad_sg, padding);
1233 }
1234 crypto_hash_final(hash, (u8 *) &data_crc);
1235
1236 return data_crc;
1237}
1238
1239static void iscsit_do_crypto_hash_buf(
1240 struct hash_desc *hash,
80690fdb 1241 const void *buf,
e48354ce
NB		 1242 u32 payload_length,
1243 u32 padding,
1244 u8 *pad_bytes,
1245 u8 *data_crc)
1246{
1247 struct scatterlist sg;
1248
1249 crypto_hash_init(hash);
1250
8359cf43 1251 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1252 crypto_hash_update(hash, &sg, payload_length);
1253
1254 if (padding) {
1255 sg_init_one(&sg, pad_bytes, padding);
1256 crypto_hash_update(hash, &sg, padding);
1257 }
1258 crypto_hash_final(hash, data_crc);
1259}
1260
3e1c81a9
NB		 1261int
1262iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1263 struct iscsi_cmd **out_cmd)
e48354ce 1264{
3e1c81a9 1265 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1266 struct iscsi_cmd *cmd = NULL;
1267 struct se_cmd *se_cmd;
e48354ce 1268 unsigned long flags;
3e1c81a9
NB		 1269 u32 payload_length = ntoh24(hdr->dlength);
1270 int rc;
e48354ce
NB		 1271
1272 if (!payload_length) {
1273 pr_err("DataOUT payload is ZERO, protocol error.\n");
1aa58ccd
NB		 1274 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1275 buf);
e48354ce
NB		 1276 }
1277
1278 /* iSCSI write */
1279 spin_lock_bh(&conn->sess->session_stats_lock);
1280 conn->sess->rx_data_octets += payload_length;
1281 if (conn->sess->se_sess->se_node_acl) {
1282 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1283 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1284 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1285 }
1286 spin_unlock_bh(&conn->sess->session_stats_lock);
1287
21f5aa7e 1288 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1289 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1290 " MaxXmitDataSegmentLength: %u\n", payload_length,
1291 conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd
NB		 1292 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1293 buf);
e48354ce
NB		 1294 }
1295
1296 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1297 payload_length);
1298 if (!cmd)
1299 return 0;
1300
1301 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1302 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1303 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1304 payload_length, conn->cid);
1305
1306 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1307 pr_err("Command ITT: 0x%08x received DataOUT after"
1308 " last DataOUT received, dumping payload\n",
1309 cmd->init_task_tag);
1310 return iscsit_dump_data_payload(conn, payload_length, 1);
1311 }
1312
1313 if (cmd->data_direction != DMA_TO_DEVICE) {
1314 pr_err("Command ITT: 0x%08x received DataOUT for a"
1315 " NON-WRITE command.\n", cmd->init_task_tag);
2152a122 1316 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1317 }
1318 se_cmd = &cmd->se_cmd;
1319 iscsit_mod_dataout_timer(cmd);
1320
50e5c87d 1321 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1322 pr_err("DataOut Offset: %u, Length %u greater than"
1323 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1324 hdr->offset, payload_length, cmd->se_cmd.data_length);
1aa58ccd 1325 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1326 }
1327
1328 if (cmd->unsolicited_data) {
1329 int dump_unsolicited_data = 0;
1330
1331 if (conn->sess->sess_ops->InitialR2T) {
1332 pr_err("Received unexpected unsolicited data"
1333 " while InitialR2T=Yes, protocol error.\n");
1334 transport_send_check_condition_and_sense(&cmd->se_cmd,
1335 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1336 return -1;
1337 }
1338 /*
1339 * Special case for dealing with Unsolicited DataOUT
1340 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1341 * failures;
1342 */
1343
1344 /* Something's amiss if we're not in WRITE_PENDING state... */
1345 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1346 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1347 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1348
1349 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
de103c93 1350 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce
NB		 1351 dump_unsolicited_data = 1;
1352 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1353
1354 if (dump_unsolicited_data) {
1355 /*
1356 * Check if a delayed TASK_ABORTED status needs to
1357 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1358 * received with the unsolicitied data out.
1359 */
1360 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1361 iscsit_stop_dataout_timer(cmd);
1362
1363 transport_check_aborted_status(se_cmd,
1364 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1365 return iscsit_dump_data_payload(conn, payload_length, 1);
1366 }
1367 } else {
1368 /*
1369 * For the normal solicited data path:
1370 *
1371 * Check for a delayed TASK_ABORTED status and dump any
1372 * incoming data out payload if one exists. Also, when the
1373 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1374 * data out sequence, we decrement outstanding_r2ts. Once
1375 * outstanding_r2ts reaches zero, go ahead and send the delayed
1376 * TASK_ABORTED status.
1377 */
7d680f3b 1378 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1379 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1380 if (--cmd->outstanding_r2ts < 1) {
1381 iscsit_stop_dataout_timer(cmd);
1382 transport_check_aborted_status(
1383 se_cmd, 1);
1384 }
1385
1386 return iscsit_dump_data_payload(conn, payload_length, 1);
1387 }
1388 }
1389 /*
1390 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1391 * within-command recovery checks before receiving the payload.
1392 */
3e1c81a9
NB		 1393 rc = iscsit_check_pre_dataout(cmd, buf);
1394 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1395 return 0;
3e1c81a9 1396 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1397 return -1;
1398
3e1c81a9
NB		 1399 *out_cmd = cmd;
1400 return 0;
1401}
1402EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1403
1404static int
1405iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1406 struct iscsi_data *hdr)
1407{
1408 struct kvec *iov;
1409 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1410 u32 payload_length = ntoh24(hdr->dlength);
1411 int iov_ret, data_crc_failed = 0;
1412
e48354ce
NB		 1413 rx_size += payload_length;
1414 iov = &cmd->iov_data[0];
1415
50e5c87d
CH		 1416 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1417 payload_length);
e48354ce
NB		 1418 if (iov_ret < 0)
1419 return -1;
1420
1421 iov_count += iov_ret;
1422
1423 padding = ((-payload_length) & 3);
1424 if (padding != 0) {
1425 iov[iov_count].iov_base = cmd->pad_bytes;
1426 iov[iov_count++].iov_len = padding;
1427 rx_size += padding;
1428 pr_debug("Receiving %u padding bytes.\n", padding);
1429 }
1430
1431 if (conn->conn_ops->DataDigest) {
1432 iov[iov_count].iov_base = &checksum;
1433 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1434 rx_size += ISCSI_CRC_LEN;
1435 }
1436
1437 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1438
1439 iscsit_unmap_iovec(cmd);
1440
1441 if (rx_got != rx_size)
1442 return -1;
1443
1444 if (conn->conn_ops->DataDigest) {
1445 u32 data_crc;
1446
1447 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1448 be32_to_cpu(hdr->offset),
1449 payload_length, padding,
e48354ce
NB		 1450 cmd->pad_bytes);
1451
1452 if (checksum != data_crc) {
1453 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1454 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1455 " does not match computed 0x%08x\n",
1456 hdr->itt, hdr->offset, payload_length,
1457 hdr->datasn, checksum, data_crc);
1458 data_crc_failed = 1;
1459 } else {
1460 pr_debug("Got CRC32C DataDigest 0x%08x for"
1461 " %u bytes of Data Out\n", checksum,
1462 payload_length);
1463 }
1464 }
3e1c81a9
NB		 1465
1466 return data_crc_failed;
1467}
1468
1469int
1470iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1471 bool data_crc_failed)
1472{
1473 struct iscsi_conn *conn = cmd->conn;
1474 int rc, ooo_cmdsn;
e48354ce
NB		 1475 /*
1476 * Increment post receive data and CRC values or perform
1477 * within-command recovery.
1478 */
3e1c81a9
NB		 1479 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1480 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1481 return 0;
3e1c81a9 1482 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1483 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1484 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1485 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1486 /*
1487 * Handle extra special case for out of order
1488 * Unsolicited Data Out.
1489 */
1490 spin_lock_bh(&cmd->istate_lock);
1491 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1492 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1493 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1494 spin_unlock_bh(&cmd->istate_lock);
1495
1496 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1497 if (ooo_cmdsn)
1498 return 0;
1499 target_execute_cmd(&cmd->se_cmd);
1500 return 0;
e48354ce
NB		 1501 } else /* DATAOUT_CANNOT_RECOVER */
1502 return -1;
1503
1504 return 0;
1505}
3e1c81a9 1506EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1507
3e1c81a9
NB		 1508static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1509{
1510 struct iscsi_cmd *cmd;
1511 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1512 int rc;
1513 bool data_crc_failed = false;
1514
1515 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1516 if (rc < 0)
adb97c29 1517 return 0;
3e1c81a9
NB		 1518 else if (!cmd)
1519 return 0;
1520
1521 rc = iscsit_get_dataout(conn, cmd, hdr);
1522 if (rc < 0)
1523 return rc;
1524 else if (rc > 0)
1525 data_crc_failed = true;
1526
1527 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1528}
1529
1530int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1531 unsigned char *buf)
e48354ce
NB		 1532{
1533 unsigned char *ping_data = NULL;
1534 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1535 u32 checksum, data_crc, padding = 0, payload_length;
3e1c81a9 1536 struct iscsi_cmd *cmd_p = NULL;
e48354ce
NB		 1537 struct kvec *iov = NULL;
1538 struct iscsi_nopout *hdr;
1539
1540 hdr = (struct iscsi_nopout *) buf;
1541 payload_length = ntoh24(hdr->dlength);
e48354ce 1542
66c7db68 1543 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1544 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1545 " not set, protocol error.\n");
382e9ff1
NB		 1546 if (!cmd)
1547 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1548 (unsigned char *)hdr);
1549
1aa58ccd
NB		 1550 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1551 (unsigned char *)hdr);
e48354ce
NB		 1552 }
1553
21f5aa7e 1554 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1555 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1556 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1557 " error.\n", payload_length,
21f5aa7e 1558 conn->conn_ops->MaxXmitDataSegmentLength);
382e9ff1
NB		 1559 if (!cmd)
1560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1561 (unsigned char *)hdr);
1562
1aa58ccd
NB		 1563 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1564 (unsigned char *)hdr);
e48354ce
NB		 1565 }
1566
3e1c81a9 1567 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1568 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1569 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1570 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1571 payload_length);
1572 /*
1573 * This is not a response to a Unsolicited NopIN, which means
1574 * it can either be a NOPOUT ping request (with a valid ITT),
1575 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1576 * Either way, make sure we allocate an struct iscsi_cmd, as both
1577 * can contain ping data.
1578 */
50e5c87d 1579 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce 1580 if (!cmd)
1aa58ccd 1581 return iscsit_reject_cmd(cmd,
e48354ce 1582 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1aa58ccd 1583 (unsigned char *)hdr);
e48354ce
NB		 1584
1585 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1586 cmd->i_state = ISTATE_SEND_NOPIN;
1587 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1588 1 : 0);
1589 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1590 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1591 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1592 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1593 cmd->data_direction = DMA_NONE;
1594 }
1595
50e5c87d 1596 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1597 rx_size = payload_length;
1598 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1599 if (!ping_data) {
1600 pr_err("Unable to allocate memory for"
1601 " NOPOUT ping data.\n");
1602 ret = -1;
1603 goto out;
1604 }
1605
1606 iov = &cmd->iov_misc[0];
1607 iov[niov].iov_base = ping_data;
1608 iov[niov++].iov_len = payload_length;
1609
1610 padding = ((-payload_length) & 3);
1611 if (padding != 0) {
1612 pr_debug("Receiving %u additional bytes"
1613 " for padding.\n", padding);
1614 iov[niov].iov_base = &cmd->pad_bytes;
1615 iov[niov++].iov_len = padding;
1616 rx_size += padding;
1617 }
1618 if (conn->conn_ops->DataDigest) {
1619 iov[niov].iov_base = &checksum;
1620 iov[niov++].iov_len = ISCSI_CRC_LEN;
1621 rx_size += ISCSI_CRC_LEN;
1622 }
1623
1624 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1625 if (rx_got != rx_size) {
1626 ret = -1;
1627 goto out;
1628 }
1629
1630 if (conn->conn_ops->DataDigest) {
1631 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1632 ping_data, payload_length,
1633 padding, cmd->pad_bytes,
1634 (u8 *)&data_crc);
1635
1636 if (checksum != data_crc) {
1637 pr_err("Ping data CRC32C DataDigest"
1638 " 0x%08x does not match computed 0x%08x\n",
1639 checksum, data_crc);
1640 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1641 pr_err("Unable to recover from"
1642 " NOPOUT Ping DataCRC failure while in"
1643 " ERL=0.\n");
1644 ret = -1;
1645 goto out;
1646 } else {
1647 /*
1648 * Silently drop this PDU and let the
1649 * initiator plug the CmdSN gap.
1650 */
1651 pr_debug("Dropping NOPOUT"
1652 " Command CmdSN: 0x%08x due to"
1653 " DataCRC error.\n", hdr->cmdsn);
1654 ret = 0;
1655 goto out;
1656 }
1657 } else {
1658 pr_debug("Got CRC32C DataDigest"
1659 " 0x%08x for %u bytes of ping data.\n",
1660 checksum, payload_length);
1661 }
1662 }
1663
1664 ping_data[payload_length] = '\0';
1665 /*
1666 * Attach ping data to struct iscsi_cmd->buf_ptr.
1667 */
8359cf43 1668 cmd->buf_ptr = ping_data;
e48354ce
NB		 1669 cmd->buf_ptr_size = payload_length;
1670
1671 pr_debug("Got %u bytes of NOPOUT ping"
1672 " data.\n", payload_length);
1673 pr_debug("Ping Data: \"%s\"\n", ping_data);
1674 }
1675
66c7db68 1676 if (hdr->itt != RESERVED_ITT) {
e48354ce
NB		 1677 if (!cmd) {
1678 pr_err("Checking CmdSN for NOPOUT,"
1679 " but cmd is NULL!\n");
1680 return -1;
1681 }
1682 /*
1683 * Initiator is expecting a NopIN ping reply,
1684 */
1685 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1686 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1687 spin_unlock_bh(&conn->cmd_lock);
1688
50e5c87d 1689 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1690
1691 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1692 iscsit_add_cmd_to_response_queue(cmd, conn,
1693 cmd->i_state);
1694 return 0;
1695 }
1696
adb97c29
NB		 1697 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1698 (unsigned char *)hdr, hdr->cmdsn);
e48354ce
NB		 1699 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1700 ret = 0;
1701 goto ping_out;
1702 }
1703 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1704 return -1;
e48354ce
NB		 1705
1706 return 0;
1707 }
1708
50e5c87d 1709 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1710 /*
1711 * This was a response to a unsolicited NOPIN ping.
1712 */
3e1c81a9
NB		 1713 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1714 if (!cmd_p)
e48354ce
NB		 1715 return -1;
1716
1717 iscsit_stop_nopin_response_timer(conn);
1718
3e1c81a9
NB		 1719 cmd_p->i_state = ISTATE_REMOVE;
1720 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
e48354ce
NB		 1721 iscsit_start_nopin_timer(conn);
1722 } else {
1723 /*
1724 * Initiator is not expecting a NOPIN is response.
1725 * Just ignore for now.
1726 *
1727 * iSCSI v19-91 10.18
1728 * "A NOP-OUT may also be used to confirm a changed
1729 * ExpStatSN if another PDU will not be available
1730 * for a long time."
1731 */
1732 ret = 0;
1733 goto out;
1734 }
1735
1736 return 0;
1737out:
1738 if (cmd)
aafc9d15 1739 iscsit_free_cmd(cmd, false);
e48354ce
NB		 1740ping_out:
1741 kfree(ping_data);
1742 return ret;
1743}
3e1c81a9 1744EXPORT_SYMBOL(iscsit_handle_nop_out);
e48354ce 1745
3e1c81a9
NB		 1746int
1747iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1748 unsigned char *buf)
e48354ce 1749{
e48354ce
NB		 1750 struct se_tmr_req *se_tmr;
1751 struct iscsi_tmr_req *tmr_req;
1752 struct iscsi_tm *hdr;
c6ccbb9b
NB		 1753 int out_of_order_cmdsn = 0, ret;
1754 bool sess_ref = false;
e48354ce
NB		 1755 u8 function;
1756
1757 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1758 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1759 function = hdr->flags;
1760
1761 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1762 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1763 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1764 hdr->rtt, hdr->refcmdsn, conn->cid);
1765
1766 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1767 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1768 hdr->rtt != RESERVED_ITT)) {
e48354ce 1769 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1770 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1771 }
1772
1773 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1774 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1775 pr_err("Task Management Request TASK_REASSIGN not"
1776 " issued as immediate command, bad iSCSI Initiator"
1777 "implementation\n");
1aa58ccd
NB		 1778 return iscsit_add_reject_cmd(cmd,
1779 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1780 }
1781 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1782 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1783 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1784
d28b1169
AG		 1785 cmd->data_direction = DMA_NONE;
1786
1787 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1788 if (!cmd->tmr_req) {
1789 pr_err("Unable to allocate memory for"
1790 " Task Management command!\n");
1aa58ccd
NB		 1791 return iscsit_add_reject_cmd(cmd,
1792 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1793 buf);
d28b1169
AG		 1794 }
1795
1796 /*
1797 * TASK_REASSIGN for ERL=2 / connection stays inside of
1798 * LIO-Target $FABRIC_MOD
1799 */
1800 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1801
1802 u8 tcm_function;
1803 int ret;
1804
1805 transport_init_se_cmd(&cmd->se_cmd,
1806 &lio_target_fabric_configfs->tf_ops,
1807 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1808 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1809
c6ccbb9b
NB		 1810 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1811 sess_ref = true;
1812
d28b1169
AG		 1813 switch (function) {
1814 case ISCSI_TM_FUNC_ABORT_TASK:
1815 tcm_function = TMR_ABORT_TASK;
1816 break;
1817 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1818 tcm_function = TMR_ABORT_TASK_SET;
1819 break;
1820 case ISCSI_TM_FUNC_CLEAR_ACA:
1821 tcm_function = TMR_CLEAR_ACA;
1822 break;
1823 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1824 tcm_function = TMR_CLEAR_TASK_SET;
1825 break;
1826 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1827 tcm_function = TMR_LUN_RESET;
1828 break;
1829 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1830 tcm_function = TMR_TARGET_WARM_RESET;
1831 break;
1832 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1833 tcm_function = TMR_TARGET_COLD_RESET;
1834 break;
1835 default:
1836 pr_err("Unknown iSCSI TMR Function:"
1837 " 0x%02x\n", function);
1aa58ccd
NB		 1838 return iscsit_add_reject_cmd(cmd,
1839 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1840 }
1841
1842 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1843 tcm_function, GFP_KERNEL);
1844 if (ret < 0)
1aa58ccd
NB		 1845 return iscsit_add_reject_cmd(cmd,
1846 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1847
1848 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1849 }
e48354ce
NB		 1850
1851 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1852 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1853 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1854 cmd->init_task_tag = hdr->itt;
1855 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1856 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1857 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1858 se_tmr = cmd->se_cmd.se_tmr_req;
1859 tmr_req = cmd->tmr_req;
1860 /*
1861 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1862 */
1863 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1864 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1865 scsilun_to_int(&hdr->lun));
e48354ce 1866 if (ret < 0) {
e48354ce
NB		 1867 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1868 goto attach;
1869 }
1870 }
1871
1872 switch (function) {
1873 case ISCSI_TM_FUNC_ABORT_TASK:
1874 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1875 if (se_tmr->response)
e48354ce 1876 goto attach;
e48354ce
NB		 1877 break;
1878 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1879 case ISCSI_TM_FUNC_CLEAR_ACA:
1880 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1881 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1882 break;
1883 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1884 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1885 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1886 goto attach;
1887 }
1888 break;
1889 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1890 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892 goto attach;
1893 }
1894 break;
1895 case ISCSI_TM_FUNC_TASK_REASSIGN:
1896 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1897 /*
1898 * Perform sanity checks on the ExpDataSN only if the
1899 * TASK_REASSIGN was successful.
1900 */
de103c93 1901 if (se_tmr->response)
e48354ce
NB		 1902 break;
1903
1904 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1aa58ccd
NB		 1905 return iscsit_add_reject_cmd(cmd,
1906 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1907 break;
1908 default:
1909 pr_err("Unknown TMR function: 0x%02x, protocol"
1910 " error.\n", function);
e48354ce
NB		 1911 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1912 goto attach;
1913 }
1914
1915 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1916 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1917 se_tmr->call_transport = 1;
1918attach:
1919 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1920 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1921 spin_unlock_bh(&conn->cmd_lock);
1922
1923 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29 1924 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1925 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1926 out_of_order_cmdsn = 1;
5a4c8666 1927 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1928 return 0;
5a4c8666 1929 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 1930 return -1;
e48354ce 1931 }
50e5c87d 1932 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1933
5a4c8666 1934 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1935 return 0;
1936 /*
1937 * Found the referenced task, send to transport for processing.
1938 */
1939 if (se_tmr->call_transport)
1940 return transport_generic_handle_tmr(&cmd->se_cmd);
1941
1942 /*
1943 * Could not find the referenced LUN, task, or Task Management
1944 * command not authorized or supported. Change state and
1945 * let the tx_thread send the response.
1946 *
1947 * For connection recovery, this is also the default action for
1948 * TMR TASK_REASSIGN.
1949 */
c6ccbb9b
NB		 1950 if (sess_ref) {
1951 pr_debug("Handle TMR, using sess_ref=true check\n");
1952 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1953 }
1954
e48354ce
NB		 1955 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1956 return 0;
1957}
3e1c81a9 1958EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1959
1960/* #warning FIXME: Support Text Command parameters besides SendTargets */
1961static int iscsit_handle_text_cmd(
1962 struct iscsi_conn *conn,
1963 unsigned char *buf)
1964{
1965 char *text_ptr, *text_in;
1966 int cmdsn_ret, niov = 0, rx_got, rx_size;
1967 u32 checksum = 0, data_crc = 0, payload_length;
76f1928e 1968 u32 padding = 0, pad_bytes = 0, text_length = 0;
e48354ce
NB		 1969 struct iscsi_cmd *cmd;
1970 struct kvec iov[3];
1971 struct iscsi_text *hdr;
1972
1973 hdr = (struct iscsi_text *) buf;
1974 payload_length = ntoh24(hdr->dlength);
e48354ce 1975
21f5aa7e 1976 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1977 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1978 "greater than MaxXmitDataSegmentLength %u.\n",
1979 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1aa58ccd 1980 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1981 }
1982
1983 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1984 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1985 hdr->exp_statsn, payload_length);
1986
1987 rx_size = text_length = payload_length;
1988 if (text_length) {
1989 text_in = kzalloc(text_length, GFP_KERNEL);
1990 if (!text_in) {
1991 pr_err("Unable to allocate memory for"
1992 " incoming text parameters\n");
1993 return -1;
1994 }
1995
1996 memset(iov, 0, 3 * sizeof(struct kvec));
1997 iov[niov].iov_base = text_in;
1998 iov[niov++].iov_len = text_length;
1999
2000 padding = ((-payload_length) & 3);
2001 if (padding != 0) {
76f1928e 2002 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2003 iov[niov++].iov_len = padding;
2004 rx_size += padding;
2005 pr_debug("Receiving %u additional bytes"
2006 " for padding.\n", padding);
2007 }
2008 if (conn->conn_ops->DataDigest) {
2009 iov[niov].iov_base = &checksum;
2010 iov[niov++].iov_len = ISCSI_CRC_LEN;
2011 rx_size += ISCSI_CRC_LEN;
2012 }
2013
2014 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2015 if (rx_got != rx_size) {
2016 kfree(text_in);
2017 return -1;
2018 }
2019
2020 if (conn->conn_ops->DataDigest) {
2021 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2022 text_in, text_length,
76f1928e 2023 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2024 (u8 *)&data_crc);
2025
2026 if (checksum != data_crc) {
2027 pr_err("Text data CRC32C DataDigest"
2028 " 0x%08x does not match computed"
2029 " 0x%08x\n", checksum, data_crc);
2030 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2031 pr_err("Unable to recover from"
2032 " Text Data digest failure while in"
2033 " ERL=0.\n");
2034 kfree(text_in);
2035 return -1;
2036 } else {
2037 /*
2038 * Silently drop this PDU and let the
2039 * initiator plug the CmdSN gap.
2040 */
2041 pr_debug("Dropping Text"
2042 " Command CmdSN: 0x%08x due to"
2043 " DataCRC error.\n", hdr->cmdsn);
2044 kfree(text_in);
2045 return 0;
2046 }
2047 } else {
2048 pr_debug("Got CRC32C DataDigest"
2049 " 0x%08x for %u bytes of text data.\n",
2050 checksum, text_length);
2051 }
2052 }
2053 text_in[text_length - 1] = '\0';
2054 pr_debug("Successfully read %d bytes of text"
2055 " data.\n", text_length);
2056
2057 if (strncmp("SendTargets", text_in, 11) != 0) {
2058 pr_err("Received Text Data that is not"
2059 " SendTargets, cannot continue.\n");
2060 kfree(text_in);
2061 return -1;
2062 }
2063 text_ptr = strchr(text_in, '=');
2064 if (!text_ptr) {
2065 pr_err("No \"=\" separator found in Text Data,"
2066 " cannot continue.\n");
2067 kfree(text_in);
2068 return -1;
2069 }
2070 if (strncmp("=All", text_ptr, 4) != 0) {
2071 pr_err("Unable to locate All value for"
2072 " SendTargets key, cannot continue.\n");
2073 kfree(text_in);
2074 return -1;
2075 }
2076/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2077 kfree(text_in);
2078 }
2079
2080 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2081 if (!cmd)
1aa58ccd
NB		 2082 return iscsit_add_reject(conn,
2083 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 2084
2085 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2086 cmd->i_state = ISTATE_SEND_TEXTRSP;
2087 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2088 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2089 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2090 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2091 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2092 cmd->data_direction = DMA_NONE;
2093
2094 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2095 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2096 spin_unlock_bh(&conn->cmd_lock);
2097
50e5c87d 2098 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2099
2100 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
adb97c29
NB		 2101 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2102 (unsigned char *)hdr, hdr->cmdsn);
e48354ce 2103 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1aa58ccd 2104 return -1;
e48354ce
NB		 2105
2106 return 0;
2107 }
2108
2109 return iscsit_execute_cmd(cmd, 0);
2110}
2111
2112int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2113{
2114 struct iscsi_conn *conn_p;
2115 struct iscsi_session *sess = conn->sess;
2116
2117 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2118 " for SID: %u.\n", conn->cid, conn->sess->sid);
2119
2120 atomic_set(&sess->session_logout, 1);
2121 atomic_set(&conn->conn_logout_remove, 1);
2122 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2123
2124 iscsit_inc_conn_usage_count(conn);
2125 iscsit_inc_session_usage_count(sess);
2126
2127 spin_lock_bh(&sess->conn_lock);
2128 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2129 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2130 continue;
2131
2132 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2133 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2134 }
2135 spin_unlock_bh(&sess->conn_lock);
2136
2137 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2138
2139 return 0;
2140}
2141
2142int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2143{
2144 struct iscsi_conn *l_conn;
2145 struct iscsi_session *sess = conn->sess;
2146
2147 pr_debug("Received logout request CLOSECONNECTION for CID:"
2148 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2149
2150 /*
2151 * A Logout Request with a CLOSECONNECTION reason code for a CID
2152 * can arrive on a connection with a differing CID.
2153 */
2154 if (conn->cid == cmd->logout_cid) {
2155 spin_lock_bh(&conn->state_lock);
2156 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2157 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2158
2159 atomic_set(&conn->conn_logout_remove, 1);
2160 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2161 iscsit_inc_conn_usage_count(conn);
2162
2163 spin_unlock_bh(&conn->state_lock);
2164 } else {
2165 /*
2166 * Handle all different cid CLOSECONNECTION requests in
2167 * iscsit_logout_post_handler_diffcid() as to give enough
2168 * time for any non immediate command's CmdSN to be
2169 * acknowledged on the connection in question.
2170 *
2171 * Here we simply make sure the CID is still around.
2172 */
2173 l_conn = iscsit_get_conn_from_cid(sess,
2174 cmd->logout_cid);
2175 if (!l_conn) {
2176 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2177 iscsit_add_cmd_to_response_queue(cmd, conn,
2178 cmd->i_state);
2179 return 0;
2180 }
2181
2182 iscsit_dec_conn_usage_count(l_conn);
2183 }
2184
2185 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2186
2187 return 0;
2188}
2189
2190int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2191{
2192 struct iscsi_session *sess = conn->sess;
2193
2194 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2195 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2196
2197 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2198 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2199 " while ERL!=2.\n");
2200 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2201 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2202 return 0;
2203 }
2204
2205 if (conn->cid == cmd->logout_cid) {
2206 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2207 " with CID: %hu on CID: %hu, implementation error.\n",
2208 cmd->logout_cid, conn->cid);
2209 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2210 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2211 return 0;
2212 }
2213
2214 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2215
2216 return 0;
2217}
2218
3e1c81a9
NB		 2219int
2220iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2221 unsigned char *buf)
e48354ce
NB		 2222{
2223 int cmdsn_ret, logout_remove = 0;
2224 u8 reason_code = 0;
e48354ce
NB		 2225 struct iscsi_logout *hdr;
2226 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2227
2228 hdr = (struct iscsi_logout *) buf;
2229 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2230
2231 if (tiqn) {
2232 spin_lock(&tiqn->logout_stats.lock);
2233 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2234 tiqn->logout_stats.normal_logouts++;
2235 else
2236 tiqn->logout_stats.abnormal_logouts++;
2237 spin_unlock(&tiqn->logout_stats.lock);
2238 }
2239
2240 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2241 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2242 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2243 hdr->cid, conn->cid);
2244
2245 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2246 pr_err("Received logout request on connection that"
2247 " is not in logged in state, ignoring request.\n");
aafc9d15 2248 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2249 return 0;
2250 }
2251
e48354ce
NB		 2252 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2253 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2254 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2255 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2256 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2257 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2258 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2259 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2260 cmd->logout_reason = reason_code;
2261 cmd->data_direction = DMA_NONE;
2262
2263 /*
2264 * We need to sleep in these cases (by returning 1) until the Logout
2265 * Response gets sent in the tx thread.
2266 */
2267 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2268 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2269 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2270 logout_remove = 1;
2271
2272 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2273 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2274 spin_unlock_bh(&conn->cmd_lock);
2275
2276 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2277 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2278
2279 /*
2280 * Immediate commands are executed, well, immediately.
2281 * Non-Immediate Logout Commands are executed in CmdSN order.
2282 */
c6037cc5 2283 if (cmd->immediate_cmd) {
e48354ce
NB		 2284 int ret = iscsit_execute_cmd(cmd, 0);
2285
2286 if (ret < 0)
2287 return ret;
2288 } else {
adb97c29 2289 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1aa58ccd 2290 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2291 logout_remove = 0;
1aa58ccd
NB		 2292 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2293 return -1;
e48354ce
NB		 2294 }
2295
2296 return logout_remove;
2297}
3e1c81a9 2298EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2299
2300static int iscsit_handle_snack(
2301 struct iscsi_conn *conn,
2302 unsigned char *buf)
2303{
e48354ce
NB		 2304 struct iscsi_snack *hdr;
2305
2306 hdr = (struct iscsi_snack *) buf;
2307 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2308
2309 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2310 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2311 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2312 hdr->begrun, hdr->runlength, conn->cid);
2313
2314 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2315 pr_err("Initiator sent SNACK request while in"
2316 " ErrorRecoveryLevel=0.\n");
1aa58ccd
NB		 2317 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2318 buf);
e48354ce
NB		 2319 }
2320 /*
2321 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2322 * call from inside iscsi_send_recovery_datain_or_r2t().
2323 */
2324 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2325 case 0:
2326 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2327 hdr->itt,
2328 be32_to_cpu(hdr->ttt),
2329 be32_to_cpu(hdr->begrun),
2330 be32_to_cpu(hdr->runlength));
e48354ce 2331 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2332 return iscsit_handle_status_snack(conn, hdr->itt,
2333 be32_to_cpu(hdr->ttt),
2334 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2335 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2336 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2337 be32_to_cpu(hdr->begrun),
2338 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2339 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2340 /* FIXME: Support R-Data SNACK */
2341 pr_err("R-Data SNACK Not Supported.\n");
1aa58ccd
NB		 2342 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2343 buf);
e48354ce
NB		 2344 default:
2345 pr_err("Unknown SNACK type 0x%02x, protocol"
2346 " error.\n", hdr->flags & 0x0f);
1aa58ccd
NB		 2347 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2348 buf);
e48354ce
NB		 2349 }
2350
2351 return 0;
2352}
2353
2354static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2355{
2356 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2357 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2358 wait_for_completion_interruptible_timeout(
2359 &conn->rx_half_close_comp,
2360 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2361 }
2362}
2363
2364static int iscsit_handle_immediate_data(
2365 struct iscsi_cmd *cmd,
3e1c81a9 2366 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2367 u32 length)
2368{
2369 int iov_ret, rx_got = 0, rx_size = 0;
2370 u32 checksum, iov_count = 0, padding = 0;
2371 struct iscsi_conn *conn = cmd->conn;
2372 struct kvec *iov;
2373
2374 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2375 if (iov_ret < 0)
2376 return IMMEDIATE_DATA_CANNOT_RECOVER;
2377
2378 rx_size = length;
2379 iov_count = iov_ret;
2380 iov = &cmd->iov_data[0];
2381
2382 padding = ((-length) & 3);
2383 if (padding != 0) {
2384 iov[iov_count].iov_base = cmd->pad_bytes;
2385 iov[iov_count++].iov_len = padding;
2386 rx_size += padding;
2387 }
2388
2389 if (conn->conn_ops->DataDigest) {
2390 iov[iov_count].iov_base = &checksum;
2391 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2392 rx_size += ISCSI_CRC_LEN;
2393 }
2394
2395 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2396
2397 iscsit_unmap_iovec(cmd);
2398
2399 if (rx_got != rx_size) {
2400 iscsit_rx_thread_wait_for_tcp(conn);
2401 return IMMEDIATE_DATA_CANNOT_RECOVER;
2402 }
2403
2404 if (conn->conn_ops->DataDigest) {
2405 u32 data_crc;
2406
2407 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2408 cmd->write_data_done, length, padding,
2409 cmd->pad_bytes);
2410
2411 if (checksum != data_crc) {
2412 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2413 " does not match computed 0x%08x\n", checksum,
2414 data_crc);
2415
2416 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2417 pr_err("Unable to recover from"
2418 " Immediate Data digest failure while"
2419 " in ERL=0.\n");
1aa58ccd 2420 iscsit_reject_cmd(cmd,
e48354ce 2421 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2422 (unsigned char *)hdr);
e48354ce
NB		 2423 return IMMEDIATE_DATA_CANNOT_RECOVER;
2424 } else {
1aa58ccd 2425 iscsit_reject_cmd(cmd,
e48354ce 2426 ISCSI_REASON_DATA_DIGEST_ERROR,
1aa58ccd 2427 (unsigned char *)hdr);
e48354ce
NB		 2428 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2429 }
2430 } else {
2431 pr_debug("Got CRC32C DataDigest 0x%08x for"
2432 " %u bytes of Immediate Data\n", checksum,
2433 length);
2434 }
2435 }
2436
2437 cmd->write_data_done += length;
2438
ebf1d95c 2439 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2440 spin_lock_bh(&cmd->istate_lock);
2441 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2442 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2443 spin_unlock_bh(&cmd->istate_lock);
2444 }
2445
2446 return IMMEDIATE_DATA_NORMAL_OPERATION;
2447}
2448
2449/*
2450 * Called with sess->conn_lock held.
2451 */
2452/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2453 with active network interface */
2454static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2455{
2456 struct iscsi_cmd *cmd;
2457 struct iscsi_conn *conn_p;
95c1229d 2458 bool found = false;
e48354ce
NB		 2459
2460 /*
2461 * Only send a Asynchronous Message on connections whos network
2462 * interface is still functional.
2463 */
2464 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2465 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2466 iscsit_inc_conn_usage_count(conn_p);
95c1229d 2467 found = true;
e48354ce
NB		 2468 break;
2469 }
2470 }
2471
95c1229d 2472 if (!found)
e48354ce
NB		 2473 return;
2474
3c989d76 2475 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2476 if (!cmd) {
2477 iscsit_dec_conn_usage_count(conn_p);
2478 return;
2479 }
2480
2481 cmd->logout_cid = conn->cid;
2482 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2483 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2484
2485 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2486 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2487 spin_unlock_bh(&conn_p->cmd_lock);
2488
2489 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2490 iscsit_dec_conn_usage_count(conn_p);
2491}
2492
2493static int iscsit_send_conn_drop_async_message(
2494 struct iscsi_cmd *cmd,
2495 struct iscsi_conn *conn)
2496{
2497 struct iscsi_async *hdr;
2498
2499 cmd->tx_size = ISCSI_HDR_LEN;
2500 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2501
2502 hdr = (struct iscsi_async *) cmd->pdu;
2503 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2504 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2505 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2506 cmd->targ_xfer_tag = 0xFFFFFFFF;
2507 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2508 cmd->stat_sn = conn->stat_sn++;
2509 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2510 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2511 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2512 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2513 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2514 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2515 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2516
2517 if (conn->conn_ops->HeaderDigest) {
2518 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2519
80690fdb
GU		 2520 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2521 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2522
2523 cmd->tx_size += ISCSI_CRC_LEN;
2524 pr_debug("Attaching CRC32C HeaderDigest to"
2525 " Async Message 0x%08x\n", *header_digest);
2526 }
2527
2528 cmd->iov_misc[0].iov_base = cmd->pdu;
2529 cmd->iov_misc[0].iov_len = cmd->tx_size;
2530 cmd->iov_misc_count = 1;
2531
2532 pr_debug("Sending Connection Dropped Async Message StatSN:"
2533 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2534 cmd->logout_cid, conn->cid);
2535 return 0;
2536}
2537
6f3c0e69
AG		 2538static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2539{
2540 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2541 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2542 wait_for_completion_interruptible_timeout(
2543 &conn->tx_half_close_comp,
2544 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2545 }
2546}
2547
2ec5a8c1
NB		 2548static void
2549iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2550 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2551 bool set_statsn)
e48354ce 2552{
2ec5a8c1
NB		 2553 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2554 hdr->flags = datain->flags;
2555 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2556 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2557 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2558 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2559 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2560 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2561 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2562 }
2563 }
2564 hton24(hdr->dlength, datain->length);
2565 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2566 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2567 (struct scsi_lun *)&hdr->lun);
2568 else
2569 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2570
2571 hdr->itt = cmd->init_task_tag;
2572
2573 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2574 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2575 else
2576 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2577 if (set_statsn)
2578 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2579 else
2580 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2581
2582 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2583 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2584 hdr->datasn = cpu_to_be32(datain->data_sn);
2585 hdr->offset = cpu_to_be32(datain->offset);
2586
2587 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2588 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2589 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2590 ntohl(hdr->offset), datain->length, conn->cid);
2591}
2592
2593static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2594{
2595 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2596 struct iscsi_datain datain;
2597 struct iscsi_datain_req *dr;
e48354ce 2598 struct kvec *iov;
2ec5a8c1
NB		 2599 u32 iov_count = 0, tx_size = 0;
2600 int eodr = 0, ret, iov_ret;
2601 bool set_statsn = false;
e48354ce
NB		 2602
2603 memset(&datain, 0, sizeof(struct iscsi_datain));
2604 dr = iscsit_get_datain_values(cmd, &datain);
2605 if (!dr) {
2606 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2607 cmd->init_task_tag);
2608 return -1;
2609 }
e48354ce
NB		 2610 /*
2611 * Be paranoid and double check the logic for now.
2612 */
ebf1d95c 2613 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2614 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2615 " datain.length: %u exceeds cmd->data_length: %u\n",
2616 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2617 cmd->se_cmd.data_length);
e48354ce
NB		 2618 return -1;
2619 }
2620
2621 spin_lock_bh(&conn->sess->session_stats_lock);
2622 conn->sess->tx_data_octets += datain.length;
2623 if (conn->sess->se_sess->se_node_acl) {
2624 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2625 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2626 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2627 }
2628 spin_unlock_bh(&conn->sess->session_stats_lock);
2629 /*
2630 * Special case for successfully execution w/ both DATAIN
2631 * and Sense Data.
2632 */
2633 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2634 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2635 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2636 else {
2637 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2638 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2639 iscsit_increment_maxcmdsn(cmd, conn->sess);
2640 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2641 set_statsn = true;
e48354ce 2642 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2643 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2644 set_statsn = true;
e48354ce
NB		 2645 }
2646
2ec5a8c1 2647 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2648
2649 iov = &cmd->iov_data[0];
2650 iov[iov_count].iov_base = cmd->pdu;
2651 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2652 tx_size += ISCSI_HDR_LEN;
2653
2654 if (conn->conn_ops->HeaderDigest) {
2655 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2656
80690fdb
GU		 2657 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2658 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2659
2660 iov[0].iov_len += ISCSI_CRC_LEN;
2661 tx_size += ISCSI_CRC_LEN;
2662
2663 pr_debug("Attaching CRC32 HeaderDigest"
2664 " for DataIN PDU 0x%08x\n", *header_digest);
2665 }
2666
2ec5a8c1
NB		 2667 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2668 datain.offset, datain.length);
e48354ce
NB		 2669 if (iov_ret < 0)
2670 return -1;
2671
2672 iov_count += iov_ret;
2673 tx_size += datain.length;
2674
2675 cmd->padding = ((-datain.length) & 3);
2676 if (cmd->padding) {
2677 iov[iov_count].iov_base = cmd->pad_bytes;
2678 iov[iov_count++].iov_len = cmd->padding;
2679 tx_size += cmd->padding;
2680
2681 pr_debug("Attaching %u padding bytes\n",
2682 cmd->padding);
2683 }
2684 if (conn->conn_ops->DataDigest) {
2685 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2686 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2687
2688 iov[iov_count].iov_base = &cmd->data_crc;
2689 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2690 tx_size += ISCSI_CRC_LEN;
2691
2692 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2693 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2694 }
2695
2696 cmd->iov_data_count = iov_count;
2697 cmd->tx_size = tx_size;
2698
6f3c0e69
AG		 2699 /* sendpage is preferred but can't insert markers */
2700 if (!conn->conn_ops->IFMarker)
2701 ret = iscsit_fe_sendpage_sg(cmd, conn);
2702 else
2703 ret = iscsit_send_tx_data(cmd, conn, 0);
2704
2705 iscsit_unmap_iovec(cmd);
2706
2707 if (ret < 0) {
2708 iscsit_tx_thread_wait_for_tcp(conn);
2709 return ret;
2710 }
2711
e48354ce 2712 if (dr->dr_complete) {
6f3c0e69 2713 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2714 2 : 1;
2715 iscsit_free_datain_req(cmd, dr);
2716 }
2717
6f3c0e69 2718 return eodr;
e48354ce
NB		 2719}
2720
2ec5a8c1
NB		 2721int
2722iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2723 struct iscsi_logout_rsp *hdr)
e48354ce 2724{
e48354ce
NB		 2725 struct iscsi_conn *logout_conn = NULL;
2726 struct iscsi_conn_recovery *cr = NULL;
2727 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2728 /*
2729 * The actual shutting down of Sessions and/or Connections
2730 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2731 * is done in scsi_logout_post_handler().
2732 */
2733 switch (cmd->logout_reason) {
2734 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2735 pr_debug("iSCSI session logout successful, setting"
2736 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2737 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2738 break;
2739 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2740 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2741 break;
2742 /*
2743 * For CLOSECONNECTION logout requests carrying
2744 * a matching logout CID -> local CID, the reference
2745 * for the local CID will have been incremented in
2746 * iscsi_logout_closeconnection().
2747 *
2748 * For CLOSECONNECTION logout requests carrying
2749 * a different CID than the connection it arrived
2750 * on, the connection responding to cmd->logout_cid
2751 * is stopped in iscsit_logout_post_handler_diffcid().
2752 */
2753
2754 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2755 " successful.\n", cmd->logout_cid, conn->cid);
2756 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2757 break;
2758 case ISCSI_LOGOUT_REASON_RECOVERY:
2759 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2760 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2761 break;
2762 /*
2763 * If the connection is still active from our point of view
2764 * force connection recovery to occur.
2765 */
2766 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2767 cmd->logout_cid);
ee1b1b9c 2768 if (logout_conn) {
e48354ce
NB		 2769 iscsit_connection_reinstatement_rcfr(logout_conn);
2770 iscsit_dec_conn_usage_count(logout_conn);
2771 }
2772
2773 cr = iscsit_get_inactive_connection_recovery_entry(
2774 conn->sess, cmd->logout_cid);
2775 if (!cr) {
2776 pr_err("Unable to locate CID: %hu for"
2777 " REMOVECONNFORRECOVERY Logout Request.\n",
2778 cmd->logout_cid);
2779 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2780 break;
2781 }
2782
2783 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2784
2785 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2786 " for recovery for CID: %hu on CID: %hu successful.\n",
2787 cmd->logout_cid, conn->cid);
2788 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2789 break;
2790 default:
2791 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2792 cmd->logout_reason);
2793 return -1;
2794 }
2795
e48354ce
NB		 2796 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2797 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2798 hdr->response = cmd->logout_response;
66c7db68 2799 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2800 cmd->stat_sn = conn->stat_sn++;
2801 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2802
2803 iscsit_increment_maxcmdsn(cmd, conn->sess);
2804 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2805 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2806
2ec5a8c1
NB		 2807 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2808 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2809 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2810 cmd->logout_cid, conn->cid);
2811
2812 return 0;
2813}
2814EXPORT_SYMBOL(iscsit_build_logout_rsp);
2815
2816static int
2817iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2818{
2819 struct kvec *iov;
2820 int niov = 0, tx_size, rc;
2821
2822 rc = iscsit_build_logout_rsp(cmd, conn,
2823 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2824 if (rc < 0)
2825 return rc;
2826
2827 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2828 iov = &cmd->iov_misc[0];
2829 iov[niov].iov_base = cmd->pdu;
2830 iov[niov++].iov_len = ISCSI_HDR_LEN;
2831
2832 if (conn->conn_ops->HeaderDigest) {
2833 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2834
80690fdb
GU		 2835 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2836 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2837
2838 iov[0].iov_len += ISCSI_CRC_LEN;
2839 tx_size += ISCSI_CRC_LEN;
2840 pr_debug("Attaching CRC32C HeaderDigest to"
2841 " Logout Response 0x%08x\n", *header_digest);
2842 }
2843 cmd->iov_misc_count = niov;
2844 cmd->tx_size = tx_size;
2845
e48354ce
NB		 2846 return 0;
2847}
2848
2ec5a8c1
NB		 2849void
2850iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2851 struct iscsi_nopin *hdr, bool nopout_response)
2852{
2853 hdr->opcode = ISCSI_OP_NOOP_IN;
2854 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2855 hton24(hdr->dlength, cmd->buf_ptr_size);
2856 if (nopout_response)
2857 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2858 hdr->itt = cmd->init_task_tag;
2859 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2860 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2861 conn->stat_sn;
2862 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2863
2864 if (nopout_response)
2865 iscsit_increment_maxcmdsn(cmd, conn->sess);
2866
2867 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2868 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2869
2870 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2871 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2872 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2873 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2874}
2875EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2876
e48354ce
NB		 2877/*
2878 * Unsolicited NOPIN, either requesting a response or not.
2879 */
2880static int iscsit_send_unsolicited_nopin(
2881 struct iscsi_cmd *cmd,
2882 struct iscsi_conn *conn,
2883 int want_response)
2884{
2ec5a8c1
NB		 2885 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2886 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2887
2ec5a8c1 2888 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2889
2890 if (conn->conn_ops->HeaderDigest) {
2891 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2892
80690fdb
GU		 2893 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2894 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2895
2896 tx_size += ISCSI_CRC_LEN;
2897 pr_debug("Attaching CRC32C HeaderDigest to"
2898 " NopIN 0x%08x\n", *header_digest);
2899 }
2900
2901 cmd->iov_misc[0].iov_base = cmd->pdu;
2902 cmd->iov_misc[0].iov_len = tx_size;
2903 cmd->iov_misc_count = 1;
2904 cmd->tx_size = tx_size;
2905
2906 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2907 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2908
6f3c0e69
AG		 2909 ret = iscsit_send_tx_data(cmd, conn, 1);
2910 if (ret < 0) {
2911 iscsit_tx_thread_wait_for_tcp(conn);
2912 return ret;
2913 }
2914
2915 spin_lock_bh(&cmd->istate_lock);
2916 cmd->i_state = want_response ?
2917 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2918 spin_unlock_bh(&cmd->istate_lock);
2919
e48354ce
NB		 2920 return 0;
2921}
2922
2ec5a8c1
NB		 2923static int
2924iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2925{
2ec5a8c1 2926 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2927 struct kvec *iov;
2ec5a8c1
NB		 2928 u32 padding = 0;
2929 int niov = 0, tx_size;
e48354ce 2930
2ec5a8c1 2931 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2932
2ec5a8c1 2933 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2934 iov = &cmd->iov_misc[0];
2935 iov[niov].iov_base = cmd->pdu;
2936 iov[niov++].iov_len = ISCSI_HDR_LEN;
2937
2938 if (conn->conn_ops->HeaderDigest) {
2939 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2940
80690fdb
GU		 2941 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2942 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2943
2944 iov[0].iov_len += ISCSI_CRC_LEN;
2945 tx_size += ISCSI_CRC_LEN;
2946 pr_debug("Attaching CRC32C HeaderDigest"
2947 " to NopIn 0x%08x\n", *header_digest);
2948 }
2949
2950 /*
2951 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2952 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2953 */
2954 if (cmd->buf_ptr_size) {
2955 iov[niov].iov_base = cmd->buf_ptr;
2956 iov[niov++].iov_len = cmd->buf_ptr_size;
2957 tx_size += cmd->buf_ptr_size;
2958
2959 pr_debug("Echoing back %u bytes of ping"
2960 " data.\n", cmd->buf_ptr_size);
2961
2962 padding = ((-cmd->buf_ptr_size) & 3);
2963 if (padding != 0) {
2964 iov[niov].iov_base = &cmd->pad_bytes;
2965 iov[niov++].iov_len = padding;
2966 tx_size += padding;
2967 pr_debug("Attaching %u additional"
2968 " padding bytes.\n", padding);
2969 }
2970 if (conn->conn_ops->DataDigest) {
2971 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2972 cmd->buf_ptr, cmd->buf_ptr_size,
2973 padding, (u8 *)&cmd->pad_bytes,
2974 (u8 *)&cmd->data_crc);
2975
2976 iov[niov].iov_base = &cmd->data_crc;
2977 iov[niov++].iov_len = ISCSI_CRC_LEN;
2978 tx_size += ISCSI_CRC_LEN;
2979 pr_debug("Attached DataDigest for %u"
2980 " bytes of ping data, CRC 0x%08x\n",
2981 cmd->buf_ptr_size, cmd->data_crc);
2982 }
2983 }
2984
2985 cmd->iov_misc_count = niov;
2986 cmd->tx_size = tx_size;
2987
e48354ce
NB		 2988 return 0;
2989}
2990
6f3c0e69 2991static int iscsit_send_r2t(
e48354ce
NB		 2992 struct iscsi_cmd *cmd,
2993 struct iscsi_conn *conn)
2994{
2995 int tx_size = 0;
2996 struct iscsi_r2t *r2t;
2997 struct iscsi_r2t_rsp *hdr;
6f3c0e69 2998 int ret;
e48354ce
NB		 2999
3000 r2t = iscsit_get_r2t_from_list(cmd);
3001 if (!r2t)
3002 return -1;
3003
3004 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3005 memset(hdr, 0, ISCSI_HDR_LEN);
3006 hdr->opcode = ISCSI_OP_R2T;
3007 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3008 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3009 (struct scsi_lun *)&hdr->lun);
66c7db68 3010 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3011 spin_lock_bh(&conn->sess->ttt_lock);
3012 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3013 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3014 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3015 spin_unlock_bh(&conn->sess->ttt_lock);
3016 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3017 hdr->statsn = cpu_to_be32(conn->stat_sn);
3018 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3019 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3020 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3021 hdr->data_offset = cpu_to_be32(r2t->offset);
3022 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3023
3024 cmd->iov_misc[0].iov_base = cmd->pdu;
3025 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3026 tx_size += ISCSI_HDR_LEN;
3027
3028 if (conn->conn_ops->HeaderDigest) {
3029 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3030
80690fdb
GU		 3031 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3032 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3033
3034 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3035 tx_size += ISCSI_CRC_LEN;
3036 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3037 " PDU 0x%08x\n", *header_digest);
3038 }
3039
3040 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3041 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3042 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3043 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3044 r2t->offset, r2t->xfer_len, conn->cid);
3045
3046 cmd->iov_misc_count = 1;
3047 cmd->tx_size = tx_size;
3048
3049 spin_lock_bh(&cmd->r2t_lock);
3050 r2t->sent_r2t = 1;
3051 spin_unlock_bh(&cmd->r2t_lock);
3052
6f3c0e69
AG		 3053 ret = iscsit_send_tx_data(cmd, conn, 1);
3054 if (ret < 0) {
3055 iscsit_tx_thread_wait_for_tcp(conn);
3056 return ret;
3057 }
3058
3059 spin_lock_bh(&cmd->dataout_timeout_lock);
3060 iscsit_start_dataout_timer(cmd, conn);
3061 spin_unlock_bh(&cmd->dataout_timeout_lock);
3062
e48354ce
NB		 3063 return 0;
3064}
3065
3066/*
8b1e1244
AG		 3067 * @recovery: If called from iscsi_task_reassign_complete_write() for
3068 * connection recovery.
e48354ce
NB		 3069 */
3070int iscsit_build_r2ts_for_cmd(
e48354ce 3071 struct iscsi_conn *conn,
3e1c81a9 3072 struct iscsi_cmd *cmd,
8b1e1244 3073 bool recovery)
e48354ce
NB		 3074{
3075 int first_r2t = 1;
3076 u32 offset = 0, xfer_len = 0;
3077
3078 spin_lock_bh(&cmd->r2t_lock);
3079 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3080 spin_unlock_bh(&cmd->r2t_lock);
3081 return 0;
3082 }
3083
8b1e1244
AG		 3084 if (conn->sess->sess_ops->DataSequenceInOrder &&
3085 !recovery)
c6037cc5 3086 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3087
3088 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3089 if (conn->sess->sess_ops->DataSequenceInOrder) {
3090 offset = cmd->r2t_offset;
3091
8b1e1244
AG		 3092 if (first_r2t && recovery) {
3093 int new_data_end = offset +
3094 conn->sess->sess_ops->MaxBurstLength -
3095 cmd->next_burst_len;
3096
ebf1d95c
AG		 3097 if (new_data_end > cmd->se_cmd.data_length)
3098 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3099 else
3100 xfer_len =
3101 conn->sess->sess_ops->MaxBurstLength -
3102 cmd->next_burst_len;
e48354ce 3103 } else {
8b1e1244
AG		 3104 int new_data_end = offset +
3105 conn->sess->sess_ops->MaxBurstLength;
3106
ebf1d95c
AG		 3107 if (new_data_end > cmd->se_cmd.data_length)
3108 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3109 else
3110 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3111 }
3112 cmd->r2t_offset += xfer_len;
3113
ebf1d95c 3114 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3115 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3116 } else {
3117 struct iscsi_seq *seq;
3118
3119 seq = iscsit_get_seq_holder_for_r2t(cmd);
3120 if (!seq) {
3121 spin_unlock_bh(&cmd->r2t_lock);
3122 return -1;
3123 }
3124
3125 offset = seq->offset;
3126 xfer_len = seq->xfer_len;
3127
3128 if (cmd->seq_send_order == cmd->seq_count)
3129 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3130 }
3131 cmd->outstanding_r2ts++;
3132 first_r2t = 0;
3133
3134 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3135 spin_unlock_bh(&cmd->r2t_lock);
3136 return -1;
3137 }
3138
3139 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3140 break;
3141 }
3142 spin_unlock_bh(&cmd->r2t_lock);
3143
3144 return 0;
3145}
3146
2ec5a8c1
NB		 3147void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3148 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3149{
2ec5a8c1 3150 if (inc_stat_sn)
e48354ce
NB		 3151 cmd->stat_sn = conn->stat_sn++;
3152
3153 spin_lock_bh(&conn->sess->session_stats_lock);
3154 conn->sess->rsp_pdus++;
3155 spin_unlock_bh(&conn->sess->session_stats_lock);
3156
e48354ce
NB		 3157 memset(hdr, 0, ISCSI_HDR_LEN);
3158 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3159 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3160 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3161 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3162 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3163 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3164 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3165 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3166 }
3167 hdr->response = cmd->iscsi_response;
3168 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3169 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3170 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3171
3172 iscsit_increment_maxcmdsn(cmd, conn->sess);
3173 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3174 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3175
2ec5a8c1
NB		 3176 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3177 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3178 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3179 cmd->se_cmd.scsi_status, conn->cid);
3180}
3181EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3182
3183static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3184{
3185 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3186 struct kvec *iov;
3187 u32 padding = 0, tx_size = 0;
3188 int iov_count = 0;
3189 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3190
3191 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3192
e48354ce
NB		 3193 iov = &cmd->iov_misc[0];
3194 iov[iov_count].iov_base = cmd->pdu;
3195 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3196 tx_size += ISCSI_HDR_LEN;
3197
3198 /*
3199 * Attach SENSE DATA payload to iSCSI Response PDU
3200 */
3201 if (cmd->se_cmd.sense_buffer &&
3202 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3203 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3204 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3205 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3206
e48354ce 3207 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3208 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3209 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3210 iov[iov_count++].iov_len =
3211 (cmd->se_cmd.scsi_sense_length + padding);
3212 tx_size += cmd->se_cmd.scsi_sense_length;
3213
3214 if (padding) {
9c58b7dd 3215 memset(cmd->sense_buffer +
e48354ce
NB		 3216 cmd->se_cmd.scsi_sense_length, 0, padding);
3217 tx_size += padding;
3218 pr_debug("Adding %u bytes of padding to"
3219 " SENSE.\n", padding);
3220 }
3221
3222 if (conn->conn_ops->DataDigest) {
3223 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3224 cmd->sense_buffer,
e48354ce
NB		 3225 (cmd->se_cmd.scsi_sense_length + padding),
3226 0, NULL, (u8 *)&cmd->data_crc);
3227
3228 iov[iov_count].iov_base = &cmd->data_crc;
3229 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3230 tx_size += ISCSI_CRC_LEN;
3231
3232 pr_debug("Attaching CRC32 DataDigest for"
3233 " SENSE, %u bytes CRC 0x%08x\n",
3234 (cmd->se_cmd.scsi_sense_length + padding),
3235 cmd->data_crc);
3236 }
3237
3238 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3239 " Response PDU\n",
3240 cmd->se_cmd.scsi_sense_length);
3241 }
3242
3243 if (conn->conn_ops->HeaderDigest) {
3244 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3245
80690fdb
GU		 3246 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3247 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3248
3249 iov[0].iov_len += ISCSI_CRC_LEN;
3250 tx_size += ISCSI_CRC_LEN;
3251 pr_debug("Attaching CRC32 HeaderDigest for Response"
3252 " PDU 0x%08x\n", *header_digest);
3253 }
3254
3255 cmd->iov_misc_count = iov_count;
3256 cmd->tx_size = tx_size;
3257
e48354ce
NB		 3258 return 0;
3259}
3260
3261static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3262{
3263 switch (se_tmr->response) {
3264 case TMR_FUNCTION_COMPLETE:
3265 return ISCSI_TMF_RSP_COMPLETE;
3266 case TMR_TASK_DOES_NOT_EXIST:
3267 return ISCSI_TMF_RSP_NO_TASK;
3268 case TMR_LUN_DOES_NOT_EXIST:
3269 return ISCSI_TMF_RSP_NO_LUN;
3270 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3271 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3272 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3273 return ISCSI_TMF_RSP_AUTH_FAILED;
3274 case TMR_FUNCTION_REJECTED:
3275 default:
3276 return ISCSI_TMF_RSP_REJECTED;
3277 }
3278}
3279
2ec5a8c1
NB		 3280void
3281iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3282 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3283{
3284 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3285
e48354ce 3286 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3287 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3288 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3289 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3290 cmd->stat_sn = conn->stat_sn++;
3291 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3292
3293 iscsit_increment_maxcmdsn(cmd, conn->sess);
3294 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3295 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3296
2ec5a8c1
NB		 3297 pr_debug("Built Task Management Response ITT: 0x%08x,"
3298 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3299 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3300}
3301EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3302
3303static int
3304iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3305{
3306 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3307 u32 tx_size = 0;
3308
3309 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3310
e48354ce
NB		 3311 cmd->iov_misc[0].iov_base = cmd->pdu;
3312 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3313 tx_size += ISCSI_HDR_LEN;
3314
3315 if (conn->conn_ops->HeaderDigest) {
3316 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3317
80690fdb
GU		 3318 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3319 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3320
3321 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3322 tx_size += ISCSI_CRC_LEN;
3323 pr_debug("Attaching CRC32 HeaderDigest for Task"
3324 " Mgmt Response PDU 0x%08x\n", *header_digest);
3325 }
3326
3327 cmd->iov_misc_count = 1;
3328 cmd->tx_size = tx_size;
3329
e48354ce
NB		 3330 return 0;
3331}
3332
2f9bc894
NB		 3333static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3334{
3335 bool ret = false;
3336
3337 if (np->np_sockaddr.ss_family == AF_INET6) {
3338 const struct sockaddr_in6 sin6 = {
3339 .sin6_addr = IN6ADDR_ANY_INIT };
3340 struct sockaddr_in6 *sock_in6 =
3341 (struct sockaddr_in6 *)&np->np_sockaddr;
3342
3343 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3344 sin6.sin6_addr.s6_addr, 16))
3345 ret = true;
3346 } else {
3347 struct sockaddr_in * sock_in =
3348 (struct sockaddr_in *)&np->np_sockaddr;
3349
cea0b4ce 3350 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3351 ret = true;
3352 }
3353
3354 return ret;
3355}
3356
8b1e1244
AG		 3357#define SENDTARGETS_BUF_LIMIT 32768U
3358
e48354ce
NB		 3359static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3360{
3361 char *payload = NULL;
3362 struct iscsi_conn *conn = cmd->conn;
3363 struct iscsi_portal_group *tpg;
3364 struct iscsi_tiqn *tiqn;
3365 struct iscsi_tpg_np *tpg_np;
3366 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3367 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
e48354ce 3368
8b1e1244
AG		 3369 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3370 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3371
3372 payload = kzalloc(buffer_len, GFP_KERNEL);
3373 if (!payload) {
3374 pr_err("Unable to allocate memory for sendtargets"
3375 " response.\n");
3376 return -ENOMEM;
3377 }
3378
3379 spin_lock(&tiqn_lock);
3380 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3381 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3382 len += 1;
3383
3384 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3385 end_of_buf = 1;
3386 goto eob;
3387 }
8359cf43 3388 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3389 payload_len += len;
3390
3391 spin_lock(&tiqn->tiqn_tpg_lock);
3392 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3393
3394 spin_lock(&tpg->tpg_state_lock);
3395 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3396 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3397 spin_unlock(&tpg->tpg_state_lock);
3398 continue;
3399 }
3400 spin_unlock(&tpg->tpg_state_lock);
3401
3402 spin_lock(&tpg->tpg_np_lock);
3403 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3404 tpg_np_list) {
2f9bc894
NB		 3405 struct iscsi_np *np = tpg_np->tpg_np;
3406 bool inaddr_any = iscsit_check_inaddr_any(np);
3407
e48354ce
NB		 3408 len = sprintf(buf, "TargetAddress="
3409 "%s%s%s:%hu,%hu",
2f9bc894
NB		 3410 (np->np_sockaddr.ss_family == AF_INET6) ?
3411 "[" : "", (inaddr_any == false) ?
3412 np->np_ip : conn->local_ip,
3413 (np->np_sockaddr.ss_family == AF_INET6) ?
3414 "]" : "", (inaddr_any == false) ?
3415 np->np_port : conn->local_port,
e48354ce
NB		 3416 tpg->tpgt);
3417 len += 1;
3418
3419 if ((len + payload_len) > buffer_len) {
3420 spin_unlock(&tpg->tpg_np_lock);
3421 spin_unlock(&tiqn->tiqn_tpg_lock);
3422 end_of_buf = 1;
3423 goto eob;
3424 }
8359cf43 3425 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3426 payload_len += len;
3427 }
3428 spin_unlock(&tpg->tpg_np_lock);
3429 }
3430 spin_unlock(&tiqn->tiqn_tpg_lock);
3431eob:
3432 if (end_of_buf)
3433 break;
3434 }
3435 spin_unlock(&tiqn_lock);
3436
3437 cmd->buf_ptr = payload;
3438
3439 return payload_len;
3440}
3441
3442/*
3443 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3444 * MaxRecvDataSegmentLength.
3445 */
3446static int iscsit_send_text_rsp(
3447 struct iscsi_cmd *cmd,
3448 struct iscsi_conn *conn)
3449{
3450 struct iscsi_text_rsp *hdr;
3451 struct kvec *iov;
3452 u32 padding = 0, tx_size = 0;
3453 int text_length, iov_count = 0;
3454
3455 text_length = iscsit_build_sendtargets_response(cmd);
3456 if (text_length < 0)
3457 return text_length;
3458
3459 padding = ((-text_length) & 3);
3460 if (padding != 0) {
3461 memset(cmd->buf_ptr + text_length, 0, padding);
3462 pr_debug("Attaching %u additional bytes for"
3463 " padding.\n", padding);
3464 }
3465
3466 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3467 memset(hdr, 0, ISCSI_HDR_LEN);
3468 hdr->opcode = ISCSI_OP_TEXT_RSP;
3469 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3470 hton24(hdr->dlength, text_length);
66c7db68 3471 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3472 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3473 cmd->stat_sn = conn->stat_sn++;
3474 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3475
3476 iscsit_increment_maxcmdsn(cmd, conn->sess);
3477 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3478 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3479
3480 iov = &cmd->iov_misc[0];
3481
3482 iov[iov_count].iov_base = cmd->pdu;
3483 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3484 iov[iov_count].iov_base = cmd->buf_ptr;
3485 iov[iov_count++].iov_len = text_length + padding;
3486
3487 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3488
3489 if (conn->conn_ops->HeaderDigest) {
3490 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3491
80690fdb
GU		 3492 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3493 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3494
3495 iov[0].iov_len += ISCSI_CRC_LEN;
3496 tx_size += ISCSI_CRC_LEN;
3497 pr_debug("Attaching CRC32 HeaderDigest for"
3498 " Text Response PDU 0x%08x\n", *header_digest);
3499 }
3500
3501 if (conn->conn_ops->DataDigest) {
3502 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3503 cmd->buf_ptr, (text_length + padding),
3504 0, NULL, (u8 *)&cmd->data_crc);
3505
3506 iov[iov_count].iov_base = &cmd->data_crc;
3507 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3508 tx_size += ISCSI_CRC_LEN;
3509
3510 pr_debug("Attaching DataDigest for %u bytes of text"
3511 " data, CRC 0x%08x\n", (text_length + padding),
3512 cmd->data_crc);
3513 }
3514
3515 cmd->iov_misc_count = iov_count;
3516 cmd->tx_size = tx_size;
3517
3518 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3519 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3520 text_length, conn->cid);
3521 return 0;
3522}
3523
2ec5a8c1
NB		 3524void
3525iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3526 struct iscsi_reject *hdr)
3527{
3528 hdr->opcode = ISCSI_OP_REJECT;
1aa58ccd 3529 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3530 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3531 hton24(hdr->dlength, ISCSI_HDR_LEN);
3532 hdr->ffffffff = cpu_to_be32(0xffffffff);
3533 cmd->stat_sn = conn->stat_sn++;
3534 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3535 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3536 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3537
3538}
3539EXPORT_SYMBOL(iscsit_build_reject);
3540
e48354ce
NB		 3541static int iscsit_send_reject(
3542 struct iscsi_cmd *cmd,
3543 struct iscsi_conn *conn)
3544{
bfbdb31d 3545 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3546 struct kvec *iov;
bfbdb31d 3547 u32 iov_count = 0, tx_size;
e48354ce 3548
bfbdb31d 3549 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3550
3551 iov = &cmd->iov_misc[0];
e48354ce
NB		 3552 iov[iov_count].iov_base = cmd->pdu;
3553 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3554 iov[iov_count].iov_base = cmd->buf_ptr;
3555 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3556
3557 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3558
3559 if (conn->conn_ops->HeaderDigest) {
3560 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3561
80690fdb
GU		 3562 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3563 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3564
3565 iov[0].iov_len += ISCSI_CRC_LEN;
3566 tx_size += ISCSI_CRC_LEN;
3567 pr_debug("Attaching CRC32 HeaderDigest for"
3568 " REJECT PDU 0x%08x\n", *header_digest);
3569 }
3570
3571 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3572 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3573 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3574
3575 iov[iov_count].iov_base = &cmd->data_crc;
3576 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3577 tx_size += ISCSI_CRC_LEN;
3578 pr_debug("Attaching CRC32 DataDigest for REJECT"
3579 " PDU 0x%08x\n", cmd->data_crc);
3580 }
3581
3582 cmd->iov_misc_count = iov_count;
3583 cmd->tx_size = tx_size;
3584
3585 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3586 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3587
3588 return 0;
3589}
3590
e48354ce
NB		 3591void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3592{
3593 struct iscsi_thread_set *ts = conn->thread_set;
3594 int ord, cpu;
3595 /*
3596 * thread_id is assigned from iscsit_global->ts_bitmap from
3597 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3598 *
3599 * Here we use thread_id to determine which CPU that this
3600 * iSCSI connection's iscsi_thread_set will be scheduled to
3601 * execute upon.
3602 */
3603 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3604 for_each_online_cpu(cpu) {
3605 if (ord-- == 0) {
3606 cpumask_set_cpu(cpu, conn->conn_cpumask);
3607 return;
3608 }
3609 }
3610 /*
3611 * This should never be reached..
3612 */
3613 dump_stack();
3614 cpumask_setall(conn->conn_cpumask);
3615}
3616
3617static inline void iscsit_thread_check_cpumask(
3618 struct iscsi_conn *conn,
3619 struct task_struct *p,
3620 int mode)
3621{
3622 char buf[128];
3623 /*
3624 * mode == 1 signals iscsi_target_tx_thread() usage.
3625 * mode == 0 signals iscsi_target_rx_thread() usage.
3626 */
3627 if (mode == 1) {
3628 if (!conn->conn_tx_reset_cpumask)
3629 return;
3630 conn->conn_tx_reset_cpumask = 0;
3631 } else {
3632 if (!conn->conn_rx_reset_cpumask)
3633 return;
3634 conn->conn_rx_reset_cpumask = 0;
3635 }
3636 /*
3637 * Update the CPU mask for this single kthread so that
3638 * both TX and RX kthreads are scheduled to run on the
3639 * same CPU.
3640 */
3641 memset(buf, 0, 128);
3642 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3643 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3644}
3645
2ec5a8c1
NB		 3646static int
3647iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3648{
6f3c0e69
AG		 3649 int ret;
3650
2ec5a8c1
NB		 3651 switch (state) {
3652 case ISTATE_SEND_R2T:
3653 ret = iscsit_send_r2t(cmd, conn);
3654 if (ret < 0)
3655 goto err;
3656 break;
3657 case ISTATE_REMOVE:
3658 spin_lock_bh(&conn->cmd_lock);
af737f67 3659 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3660 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3661
aafc9d15 3662 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3663 break;
3664 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3665 iscsit_mod_nopin_response_timer(conn);
3666 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3667 if (ret < 0)
6f3c0e69 3668 goto err;
2ec5a8c1
NB		 3669 break;
3670 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3671 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3672 if (ret < 0)
3673 goto err;
3674 break;
3675 default:
3676 pr_err("Unknown Opcode: 0x%02x ITT:"
3677 " 0x%08x, i_state: %d on CID: %hu\n",
3678 cmd->iscsi_opcode, cmd->init_task_tag, state,
3679 conn->cid);
3680 goto err;
6f3c0e69
AG		 3681 }
3682
3683 return 0;
3684
3685err:
3686 return -1;
3687}
3688
2ec5a8c1
NB		 3689static int
3690iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3691{
2ec5a8c1 3692 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3693 struct iscsi_queue_req *qr;
3694 struct iscsi_cmd *cmd;
3695 u8 state;
3696 int ret;
3697
2ec5a8c1
NB		 3698 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3699 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3700 cmd = qr->cmd;
3701 state = qr->state;
3702 kmem_cache_free(lio_qr_cache, qr);
3703
2ec5a8c1
NB		 3704 ret = t->iscsit_immediate_queue(conn, cmd, state);
3705 if (ret < 0)
3706 return ret;
3707 }
fd3a9025 3708
2ec5a8c1
NB		 3709 return 0;
3710}
6f3c0e69 3711
2ec5a8c1
NB		 3712static int
3713iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3714{
3715 int ret;
3716
3717check_rsp_state:
3718 switch (state) {
3719 case ISTATE_SEND_DATAIN:
3720 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3721 if (ret < 0)
3722 goto err;
2ec5a8c1
NB		 3723 else if (!ret)
3724 /* more drs */
3725 goto check_rsp_state;
3726 else if (ret == 1) {
3727 /* all done */
3728 spin_lock_bh(&cmd->istate_lock);
3729 cmd->i_state = ISTATE_SENT_STATUS;
3730 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3731
2ec5a8c1
NB		 3732 if (atomic_read(&conn->check_immediate_queue))
3733 return 1;
6f3c0e69 3734
2ec5a8c1
NB		 3735 return 0;
3736 } else if (ret == 2) {
3737 /* Still must send status,
3738 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3739 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3740 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3741 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3742 state = ISTATE_SEND_STATUS;
3743 goto check_rsp_state;
3744 }
3745
3746 break;
3747 case ISTATE_SEND_STATUS:
3748 case ISTATE_SEND_STATUS_RECOVERY:
3749 ret = iscsit_send_response(cmd, conn);
3750 break;
3751 case ISTATE_SEND_LOGOUTRSP:
3752 ret = iscsit_send_logout(cmd, conn);
3753 break;
3754 case ISTATE_SEND_ASYNCMSG:
3755 ret = iscsit_send_conn_drop_async_message(
3756 cmd, conn);
3757 break;
3758 case ISTATE_SEND_NOPIN:
3759 ret = iscsit_send_nopin(cmd, conn);
3760 break;
3761 case ISTATE_SEND_REJECT:
3762 ret = iscsit_send_reject(cmd, conn);
3763 break;
3764 case ISTATE_SEND_TASKMGTRSP:
3765 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3766 if (ret != 0)
6f3c0e69 3767 break;
2ec5a8c1
NB		 3768 ret = iscsit_tmr_post_handler(cmd, conn);
3769 if (ret != 0)
3770 iscsit_fall_back_to_erl0(conn->sess);
3771 break;
3772 case ISTATE_SEND_TEXTRSP:
3773 ret = iscsit_send_text_rsp(cmd, conn);
3774 break;
3775 default:
3776 pr_err("Unknown Opcode: 0x%02x ITT:"
3777 " 0x%08x, i_state: %d on CID: %hu\n",
3778 cmd->iscsi_opcode, cmd->init_task_tag,
3779 state, conn->cid);
3780 goto err;
3781 }
3782 if (ret < 0)
3783 goto err;
3784
3785 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3786 iscsit_tx_thread_wait_for_tcp(conn);
3787 iscsit_unmap_iovec(cmd);
3788 goto err;
3789 }
3790 iscsit_unmap_iovec(cmd);
3791
3792 switch (state) {
3793 case ISTATE_SEND_LOGOUTRSP:
3794 if (!iscsit_logout_post_handler(cmd, conn))
3795 goto restart;
3796 /* fall through */
3797 case ISTATE_SEND_STATUS:
3798 case ISTATE_SEND_ASYNCMSG:
3799 case ISTATE_SEND_NOPIN:
3800 case ISTATE_SEND_STATUS_RECOVERY:
3801 case ISTATE_SEND_TEXTRSP:
3802 case ISTATE_SEND_TASKMGTRSP:
1aa58ccd 3803 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3804 spin_lock_bh(&cmd->istate_lock);
3805 cmd->i_state = ISTATE_SENT_STATUS;
3806 spin_unlock_bh(&cmd->istate_lock);
3807 break;
2ec5a8c1
NB		 3808 default:
3809 pr_err("Unknown Opcode: 0x%02x ITT:"
3810 " 0x%08x, i_state: %d on CID: %hu\n",
3811 cmd->iscsi_opcode, cmd->init_task_tag,
3812 cmd->i_state, conn->cid);
3813 goto err;
6f3c0e69
AG		 3814 }
3815
2ec5a8c1
NB		 3816 if (atomic_read(&conn->check_immediate_queue))
3817 return 1;
3818
6f3c0e69
AG		 3819 return 0;
3820
3821err:
3822 return -1;
3823restart:
3824 return -EAGAIN;
3825}
3826
2ec5a8c1
NB		 3827static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3828{
3829 struct iscsit_transport *t = conn->conn_transport;
3830 struct iscsi_queue_req *qr;
3831 struct iscsi_cmd *cmd;
3832 u8 state;
3833 int ret;
3834
3835 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3836 cmd = qr->cmd;
3837 state = qr->state;
3838 kmem_cache_free(lio_qr_cache, qr);
3839
3840 ret = t->iscsit_response_queue(conn, cmd, state);
3841 if (ret == 1 || ret < 0)
3842 return ret;
3843 }
3844
3845 return 0;
3846}
3847
6f3c0e69
AG		 3848int iscsi_target_tx_thread(void *arg)
3849{
e48354ce 3850 int ret = 0;
e48354ce 3851 struct iscsi_conn *conn;
8359cf43 3852 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3853 /*
3854 * Allow ourselves to be interrupted by SIGINT so that a
3855 * connection recovery / failure event can be triggered externally.
3856 */
3857 allow_signal(SIGINT);
3858
3859restart:
3860 conn = iscsi_tx_thread_pre_handler(ts);
3861 if (!conn)
3862 goto out;
3863
6f3c0e69 3864 ret = 0;
e48354ce
NB		 3865
3866 while (!kthread_should_stop()) {
3867 /*
3868 * Ensure that both TX and RX per connection kthreads
3869 * are scheduled to run on the same CPU.
3870 */
3871 iscsit_thread_check_cpumask(conn, current, 1);
3872
d5627acb
RD		 3873 wait_event_interruptible(conn->queues_wq,
3874 !iscsit_conn_all_queues_empty(conn) ||
3875 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3876
3877 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3878 signal_pending(current))
3879 goto transport_err;
3880
fd3a9025 3881get_immediate:
2ec5a8c1 3882 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3883 if (ret < 0)
3884 goto transport_err;
e48354ce 3885
2ec5a8c1 3886 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3887 if (ret == 1)
3888 goto get_immediate;
3889 else if (ret == -EAGAIN)
6f3c0e69
AG		 3890 goto restart;
3891 else if (ret < 0)
3892 goto transport_err;
e48354ce
NB		 3893 }
3894
3895transport_err:
3896 iscsit_take_action_for_connection_exit(conn);
3897 goto restart;
3898out:
3899 return 0;
3900}
3901
3e1c81a9
NB		 3902static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3903{
3904 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3905 struct iscsi_cmd *cmd;
3906 int ret = 0;
3907
3908 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3909 case ISCSI_OP_SCSI_CMD:
3910 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3911 if (!cmd)
1aa58ccd 3912 goto reject;
3e1c81a9
NB		 3913
3914 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3915 break;
3916 case ISCSI_OP_SCSI_DATA_OUT:
3917 ret = iscsit_handle_data_out(conn, buf);
3918 break;
3919 case ISCSI_OP_NOOP_OUT:
3920 cmd = NULL;
3921 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3922 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3923 if (!cmd)
1aa58ccd 3924 goto reject;
3e1c81a9
NB		 3925 }
3926 ret = iscsit_handle_nop_out(conn, cmd, buf);
3927 break;
3928 case ISCSI_OP_SCSI_TMFUNC:
3929 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3930 if (!cmd)
1aa58ccd 3931 goto reject;
3e1c81a9
NB		 3932
3933 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3934 break;
3935 case ISCSI_OP_TEXT:
3936 ret = iscsit_handle_text_cmd(conn, buf);
3937 break;
3938 case ISCSI_OP_LOGOUT:
3939 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3940 if (!cmd)
1aa58ccd 3941 goto reject;
3e1c81a9
NB		 3942
3943 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3944 if (ret > 0)
3945 wait_for_completion_timeout(&conn->conn_logout_comp,
3946 SECONDS_FOR_LOGOUT_COMP * HZ);
3947 break;
3948 case ISCSI_OP_SNACK:
3949 ret = iscsit_handle_snack(conn, buf);
3950 break;
3951 default:
3952 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3953 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3954 pr_err("Cannot recover from unknown"
3955 " opcode while ERL=0, closing iSCSI connection.\n");
3956 return -1;
3957 }
3958 if (!conn->conn_ops->OFMarker) {
3959 pr_err("Unable to recover from unknown"
3960 " opcode while OFMarker=No, closing iSCSI"
3961 " connection.\n");
3962 return -1;
3963 }
3964 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3965 pr_err("Unable to recover from unknown"
3966 " opcode, closing iSCSI connection.\n");
3967 return -1;
3968 }
3969 break;
3970 }
3971
3972 return ret;
1aa58ccd
NB		 3973reject:
3974 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 3975}
3976
e48354ce
NB		 3977int iscsi_target_rx_thread(void *arg)
3978{
3979 int ret;
3980 u8 buffer[ISCSI_HDR_LEN], opcode;
3981 u32 checksum = 0, digest = 0;
3982 struct iscsi_conn *conn = NULL;
8359cf43 3983 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3984 struct kvec iov;
3985 /*
3986 * Allow ourselves to be interrupted by SIGINT so that a
3987 * connection recovery / failure event can be triggered externally.
3988 */
3989 allow_signal(SIGINT);
3990
3991restart:
3992 conn = iscsi_rx_thread_pre_handler(ts);
3993 if (!conn)
3994 goto out;
3995
3e1c81a9
NB		 3996 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
3997 struct completion comp;
3998 int rc;
3999
4000 init_completion(&comp);
4001 rc = wait_for_completion_interruptible(&comp);
4002 if (rc < 0)
4003 goto transport_err;
4004
4005 goto out;
4006 }
4007
e48354ce
NB		 4008 while (!kthread_should_stop()) {
4009 /*
4010 * Ensure that both TX and RX per connection kthreads
4011 * are scheduled to run on the same CPU.
4012 */
4013 iscsit_thread_check_cpumask(conn, current, 0);
4014
4015 memset(buffer, 0, ISCSI_HDR_LEN);
4016 memset(&iov, 0, sizeof(struct kvec));
4017
4018 iov.iov_base = buffer;
4019 iov.iov_len = ISCSI_HDR_LEN;
4020
4021 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4022 if (ret != ISCSI_HDR_LEN) {
4023 iscsit_rx_thread_wait_for_tcp(conn);
4024 goto transport_err;
4025 }
4026
4027 /*
4028 * Set conn->bad_hdr for use with REJECT PDUs.
4029 */
4030 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4031
4032 if (conn->conn_ops->HeaderDigest) {
4033 iov.iov_base = &digest;
4034 iov.iov_len = ISCSI_CRC_LEN;
4035
4036 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4037 if (ret != ISCSI_CRC_LEN) {
4038 iscsit_rx_thread_wait_for_tcp(conn);
4039 goto transport_err;
4040 }
4041
4042 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4043 buffer, ISCSI_HDR_LEN,
4044 0, NULL, (u8 *)&checksum);
4045
4046 if (digest != checksum) {
4047 pr_err("HeaderDigest CRC32C failed,"
4048 " received 0x%08x, computed 0x%08x\n",
4049 digest, checksum);
4050 /*
4051 * Set the PDU to 0xff so it will intentionally
4052 * hit default in the switch below.
4053 */
4054 memset(buffer, 0xff, ISCSI_HDR_LEN);
4055 spin_lock_bh(&conn->sess->session_stats_lock);
4056 conn->sess->conn_digest_errors++;
4057 spin_unlock_bh(&conn->sess->session_stats_lock);
4058 } else {
4059 pr_debug("Got HeaderDigest CRC32C"
4060 " 0x%08x\n", checksum);
4061 }
4062 }
4063
4064 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4065 goto transport_err;
4066
4067 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4068
4069 if (conn->sess->sess_ops->SessionType &&
4070 ((!(opcode & ISCSI_OP_TEXT)) ||
4071 (!(opcode & ISCSI_OP_LOGOUT)))) {
4072 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4073 " while in Discovery Session, rejecting.\n", opcode);
1aa58ccd
NB		 4074 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4075 buffer);
e48354ce
NB		 4076 goto transport_err;
4077 }
4078
3e1c81a9
NB		 4079 ret = iscsi_target_rx_opcode(conn, buffer);
4080 if (ret < 0)
4081 goto transport_err;
e48354ce
NB		 4082 }
4083
4084transport_err:
4085 if (!signal_pending(current))
4086 atomic_set(&conn->transport_failed, 1);
4087 iscsit_take_action_for_connection_exit(conn);
4088 goto restart;
4089out:
4090 return 0;
4091}
4092
4093static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4094{
4095 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4096 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4097 /*
4098 * We expect this function to only ever be called from either RX or TX
4099 * thread context via iscsit_close_connection() once the other context
4100 * has been reset -> returned sleeping pre-handler state.
4101 */
4102 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4103 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4104
af737f67 4105 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4106 spin_unlock_bh(&conn->cmd_lock);
4107
4108 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4109
aafc9d15 4110 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4111
4112 spin_lock_bh(&conn->cmd_lock);
4113 }
4114 spin_unlock_bh(&conn->cmd_lock);
4115}
4116
4117static void iscsit_stop_timers_for_cmds(
4118 struct iscsi_conn *conn)
4119{
4120 struct iscsi_cmd *cmd;
4121
4122 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4123 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4124 if (cmd->data_direction == DMA_TO_DEVICE)
4125 iscsit_stop_dataout_timer(cmd);
4126 }
4127 spin_unlock_bh(&conn->cmd_lock);
4128}
4129
4130int iscsit_close_connection(
4131 struct iscsi_conn *conn)
4132{
4133 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4134 struct iscsi_session *sess = conn->sess;
4135
4136 pr_debug("Closing iSCSI connection CID %hu on SID:"
4137 " %u\n", conn->cid, sess->sid);
4138 /*
20781616
NB		 4139 * Always up conn_logout_comp for the traditional TCP case just in case
4140 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4141 * response never got sent because the connection failed.
4142 *
4143 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4144 * to signal logout response TX interrupt completion. Go ahead and skip
4145 * this for iser since isert_rx_opcode() does not wait on logout failure,
4146 * and to avoid iscsi_conn pointer dereference in iser-target code.
e48354ce 4147 */
20781616
NB		 4148 if (conn->conn_transport->transport_type == ISCSI_TCP)
4149 complete(&conn->conn_logout_comp);
e48354ce
NB		 4150
4151 iscsi_release_thread_set(conn);
4152
4153 iscsit_stop_timers_for_cmds(conn);
4154 iscsit_stop_nopin_response_timer(conn);
4155 iscsit_stop_nopin_timer(conn);
d8bd97a0
NB		 4156
4157 if (conn->conn_transport->iscsit_wait_conn)
4158 conn->conn_transport->iscsit_wait_conn(conn);
4159
e48354ce
NB		 4160 /*
4161 * During Connection recovery drop unacknowledged out of order
4162 * commands for this connection, and prepare the other commands
4163 * for realligence.
4164 *
4165 * During normal operation clear the out of order commands (but
4166 * do not free the struct iscsi_ooo_cmdsn's) and release all
4167 * struct iscsi_cmds.
4168 */
4169 if (atomic_read(&conn->connection_recovery)) {
4170 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4171 iscsit_prepare_cmds_for_realligance(conn);
4172 } else {
4173 iscsit_clear_ooo_cmdsns_for_conn(conn);
4174 iscsit_release_commands_from_conn(conn);
4175 }
dda585bf 4176 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4177
4178 /*
4179 * Handle decrementing session or connection usage count if
4180 * a logout response was not able to be sent because the
4181 * connection failed. Fall back to Session Recovery here.
4182 */
4183 if (atomic_read(&conn->conn_logout_remove)) {
4184 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4185 iscsit_dec_conn_usage_count(conn);
4186 iscsit_dec_session_usage_count(sess);
4187 }
4188 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4189 iscsit_dec_conn_usage_count(conn);
4190
4191 atomic_set(&conn->conn_logout_remove, 0);
4192 atomic_set(&sess->session_reinstatement, 0);
4193 atomic_set(&sess->session_fall_back_to_erl0, 1);
4194 }
4195
4196 spin_lock_bh(&sess->conn_lock);
4197 list_del(&conn->conn_list);
4198
4199 /*
4200 * Attempt to let the Initiator know this connection failed by
4201 * sending an Connection Dropped Async Message on another
4202 * active connection.
4203 */
4204 if (atomic_read(&conn->connection_recovery))
4205 iscsit_build_conn_drop_async_message(conn);
4206
4207 spin_unlock_bh(&sess->conn_lock);
4208
4209 /*
4210 * If connection reinstatement is being performed on this connection,
4211 * up the connection reinstatement semaphore that is being blocked on
4212 * in iscsit_cause_connection_reinstatement().
4213 */
4214 spin_lock_bh(&conn->state_lock);
4215 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4216 spin_unlock_bh(&conn->state_lock);
4217 complete(&conn->conn_wait_comp);
4218 wait_for_completion(&conn->conn_post_wait_comp);
4219 spin_lock_bh(&conn->state_lock);
4220 }
4221
4222 /*
4223 * If connection reinstatement is being performed on this connection
4224 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4225 * connection wait rcfr semaphore that is being blocked on
4226 * an iscsit_connection_reinstatement_rcfr().
4227 */
4228 if (atomic_read(&conn->connection_wait_rcfr)) {
4229 spin_unlock_bh(&conn->state_lock);
4230 complete(&conn->conn_wait_rcfr_comp);
4231 wait_for_completion(&conn->conn_post_wait_comp);
4232 spin_lock_bh(&conn->state_lock);
4233 }
4234 atomic_set(&conn->connection_reinstatement, 1);
4235 spin_unlock_bh(&conn->state_lock);
4236
4237 /*
4238 * If any other processes are accessing this connection pointer we
4239 * must wait until they have completed.
4240 */
4241 iscsit_check_conn_usage_count(conn);
4242
4243 if (conn->conn_rx_hash.tfm)
4244 crypto_free_hash(conn->conn_rx_hash.tfm);
4245 if (conn->conn_tx_hash.tfm)
4246 crypto_free_hash(conn->conn_tx_hash.tfm);
4247
4248 if (conn->conn_cpumask)
4249 free_cpumask_var(conn->conn_cpumask);
4250
4251 kfree(conn->conn_ops);
4252 conn->conn_ops = NULL;
4253
bf6932f4 4254 if (conn->sock)
e48354ce 4255 sock_release(conn->sock);
baa4d64b
NB		 4256
4257 if (conn->conn_transport->iscsit_free_conn)
4258 conn->conn_transport->iscsit_free_conn(conn);
4259
4260 iscsit_put_transport(conn->conn_transport);
4261
e48354ce
NB		 4262 conn->thread_set = NULL;
4263
4264 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4265 conn->conn_state = TARG_CONN_STATE_FREE;
4266 kfree(conn);
4267
4268 spin_lock_bh(&sess->conn_lock);
4269 atomic_dec(&sess->nconn);
4270 pr_debug("Decremented iSCSI connection count to %hu from node:"
4271 " %s\n", atomic_read(&sess->nconn),
4272 sess->sess_ops->InitiatorName);
4273 /*
4274 * Make sure that if one connection fails in an non ERL=2 iSCSI
4275 * Session that they all fail.
4276 */
4277 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4278 !atomic_read(&sess->session_logout))
4279 atomic_set(&sess->session_fall_back_to_erl0, 1);
4280
4281 /*
4282 * If this was not the last connection in the session, and we are
4283 * performing session reinstatement or falling back to ERL=0, call
4284 * iscsit_stop_session() without sleeping to shutdown the other
4285 * active connections.
4286 */
4287 if (atomic_read(&sess->nconn)) {
4288 if (!atomic_read(&sess->session_reinstatement) &&
4289 !atomic_read(&sess->session_fall_back_to_erl0)) {
4290 spin_unlock_bh(&sess->conn_lock);
4291 return 0;
4292 }
4293 if (!atomic_read(&sess->session_stop_active)) {
4294 atomic_set(&sess->session_stop_active, 1);
4295 spin_unlock_bh(&sess->conn_lock);
4296 iscsit_stop_session(sess, 0, 0);
4297 return 0;
4298 }
4299 spin_unlock_bh(&sess->conn_lock);
4300 return 0;
4301 }
4302
4303 /*
4304 * If this was the last connection in the session and one of the
4305 * following is occurring:
4306 *
4307 * Session Reinstatement is not being performed, and are falling back
4308 * to ERL=0 call iscsit_close_session().
4309 *
4310 * Session Logout was requested. iscsit_close_session() will be called
4311 * elsewhere.
4312 *
4313 * Session Continuation is not being performed, start the Time2Retain
4314 * handler and check if sleep_on_sess_wait_sem is active.
4315 */
4316 if (!atomic_read(&sess->session_reinstatement) &&
4317 atomic_read(&sess->session_fall_back_to_erl0)) {
4318 spin_unlock_bh(&sess->conn_lock);
99367f01 4319 target_put_session(sess->se_sess);
e48354ce
NB		 4320
4321 return 0;
4322 } else if (atomic_read(&sess->session_logout)) {
4323 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4324 sess->session_state = TARG_SESS_STATE_FREE;
4325 spin_unlock_bh(&sess->conn_lock);
4326
4327 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4328 complete(&sess->session_wait_comp);
4329
4330 return 0;
4331 } else {
4332 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4333 sess->session_state = TARG_SESS_STATE_FAILED;
4334
4335 if (!atomic_read(&sess->session_continuation)) {
4336 spin_unlock_bh(&sess->conn_lock);
4337 iscsit_start_time2retain_handler(sess);
4338 } else
4339 spin_unlock_bh(&sess->conn_lock);
4340
4341 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4342 complete(&sess->session_wait_comp);
4343
4344 return 0;
4345 }
4346 spin_unlock_bh(&sess->conn_lock);
4347
4348 return 0;
4349}
4350
4351int iscsit_close_session(struct iscsi_session *sess)
4352{
4353 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4354 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4355
4356 if (atomic_read(&sess->nconn)) {
4357 pr_err("%d connection(s) still exist for iSCSI session"
4358 " to %s\n", atomic_read(&sess->nconn),
4359 sess->sess_ops->InitiatorName);
4360 BUG();
4361 }
4362
4363 spin_lock_bh(&se_tpg->session_lock);
4364 atomic_set(&sess->session_logout, 1);
4365 atomic_set(&sess->session_reinstatement, 1);
4366 iscsit_stop_time2retain_timer(sess);
4367 spin_unlock_bh(&se_tpg->session_lock);
4368
4369 /*
4370 * transport_deregister_session_configfs() will clear the
4371 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4372 * can be setting it again with __transport_register_session() in
4373 * iscsi_post_login_handler() again after the iscsit_stop_session()
4374 * completes in iscsi_np context.
4375 */
4376 transport_deregister_session_configfs(sess->se_sess);
4377
4378 /*
4379 * If any other processes are accessing this session pointer we must
4380 * wait until they have completed. If we are in an interrupt (the
4381 * time2retain handler) and contain and active session usage count we
4382 * restart the timer and exit.
4383 */
4384 if (!in_interrupt()) {
4385 if (iscsit_check_session_usage_count(sess) == 1)
4386 iscsit_stop_session(sess, 1, 1);
4387 } else {
4388 if (iscsit_check_session_usage_count(sess) == 2) {
4389 atomic_set(&sess->session_logout, 0);
4390 iscsit_start_time2retain_handler(sess);
4391 return 0;
4392 }
4393 }
4394
4395 transport_deregister_session(sess->se_sess);
4396
4397 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4398 iscsit_free_connection_recovery_entires(sess);
4399
4400 iscsit_free_all_ooo_cmdsns(sess);
4401
4402 spin_lock_bh(&se_tpg->session_lock);
4403 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4404 sess->session_state = TARG_SESS_STATE_FREE;
4405 pr_debug("Released iSCSI session from node: %s\n",
4406 sess->sess_ops->InitiatorName);
4407 tpg->nsessions--;
4408 if (tpg->tpg_tiqn)
4409 tpg->tpg_tiqn->tiqn_nsessions--;
4410
4411 pr_debug("Decremented number of active iSCSI Sessions on"
4412 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4413
4414 spin_lock(&sess_idr_lock);
4415 idr_remove(&sess_idr, sess->session_index);
4416 spin_unlock(&sess_idr_lock);
4417
4418 kfree(sess->sess_ops);
4419 sess->sess_ops = NULL;
4420 spin_unlock_bh(&se_tpg->session_lock);
4421
4422 kfree(sess);
4423 return 0;
4424}
4425
4426static void iscsit_logout_post_handler_closesession(
4427 struct iscsi_conn *conn)
4428{
4429 struct iscsi_session *sess = conn->sess;
4430
4431 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4432 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4433
4434 atomic_set(&conn->conn_logout_remove, 0);
4435 complete(&conn->conn_logout_comp);
4436
4437 iscsit_dec_conn_usage_count(conn);
4438 iscsit_stop_session(sess, 1, 1);
4439 iscsit_dec_session_usage_count(sess);
99367f01 4440 target_put_session(sess->se_sess);
e48354ce
NB		 4441}
4442
4443static void iscsit_logout_post_handler_samecid(
4444 struct iscsi_conn *conn)
4445{
4446 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4447 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4448
4449 atomic_set(&conn->conn_logout_remove, 0);
4450 complete(&conn->conn_logout_comp);
4451
4452 iscsit_cause_connection_reinstatement(conn, 1);
4453 iscsit_dec_conn_usage_count(conn);
4454}
4455
4456static void iscsit_logout_post_handler_diffcid(
4457 struct iscsi_conn *conn,
4458 u16 cid)
4459{
4460 struct iscsi_conn *l_conn;
4461 struct iscsi_session *sess = conn->sess;
b04cb59b 4462 bool conn_found = false;
e48354ce
NB		 4463
4464 if (!sess)
4465 return;
4466
4467 spin_lock_bh(&sess->conn_lock);
4468 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4469 if (l_conn->cid == cid) {
4470 iscsit_inc_conn_usage_count(l_conn);
b04cb59b 4471 conn_found = true;
e48354ce
NB		 4472 break;
4473 }
4474 }
4475 spin_unlock_bh(&sess->conn_lock);
4476
b04cb59b 4477 if (!conn_found)
e48354ce
NB		 4478 return;
4479
4480 if (l_conn->sock)
4481 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4482
4483 spin_lock_bh(&l_conn->state_lock);
4484 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4485 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4486 spin_unlock_bh(&l_conn->state_lock);
4487
4488 iscsit_cause_connection_reinstatement(l_conn, 1);
4489 iscsit_dec_conn_usage_count(l_conn);
4490}
4491
4492/*
4493 * Return of 0 causes the TX thread to restart.
4494 */
2ec5a8c1 4495int iscsit_logout_post_handler(
e48354ce
NB		 4496 struct iscsi_cmd *cmd,
4497 struct iscsi_conn *conn)
4498{
4499 int ret = 0;
4500
4501 switch (cmd->logout_reason) {
4502 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4503 switch (cmd->logout_response) {
4504 case ISCSI_LOGOUT_SUCCESS:
4505 case ISCSI_LOGOUT_CLEANUP_FAILED:
4506 default:
4507 iscsit_logout_post_handler_closesession(conn);
4508 break;
4509 }
4510 ret = 0;
4511 break;
4512 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4513 if (conn->cid == cmd->logout_cid) {
4514 switch (cmd->logout_response) {
4515 case ISCSI_LOGOUT_SUCCESS:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517 default:
4518 iscsit_logout_post_handler_samecid(conn);
4519 break;
4520 }
4521 ret = 0;
4522 } else {
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 iscsit_logout_post_handler_diffcid(conn,
4526 cmd->logout_cid);
4527 break;
4528 case ISCSI_LOGOUT_CID_NOT_FOUND:
4529 case ISCSI_LOGOUT_CLEANUP_FAILED:
4530 default:
4531 break;
4532 }
4533 ret = 1;
4534 }
4535 break;
4536 case ISCSI_LOGOUT_REASON_RECOVERY:
4537 switch (cmd->logout_response) {
4538 case ISCSI_LOGOUT_SUCCESS:
4539 case ISCSI_LOGOUT_CID_NOT_FOUND:
4540 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4541 case ISCSI_LOGOUT_CLEANUP_FAILED:
4542 default:
4543 break;
4544 }
4545 ret = 1;
4546 break;
4547 default:
4548 break;
4549
4550 }
4551 return ret;
4552}
2ec5a8c1 4553EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4554
4555void iscsit_fail_session(struct iscsi_session *sess)
4556{
4557 struct iscsi_conn *conn;
4558
4559 spin_lock_bh(&sess->conn_lock);
4560 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4561 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4562 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4563 }
4564 spin_unlock_bh(&sess->conn_lock);
4565
4566 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4567 sess->session_state = TARG_SESS_STATE_FAILED;
4568}
4569
4570int iscsit_free_session(struct iscsi_session *sess)
4571{
4572 u16 conn_count = atomic_read(&sess->nconn);
4573 struct iscsi_conn *conn, *conn_tmp = NULL;
4574 int is_last;
4575
4576 spin_lock_bh(&sess->conn_lock);
4577 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4578
4579 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4580 conn_list) {
4581 if (conn_count == 0)
4582 break;
4583
4584 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4585 is_last = 1;
4586 } else {
4587 iscsit_inc_conn_usage_count(conn_tmp);
4588 is_last = 0;
4589 }
4590 iscsit_inc_conn_usage_count(conn);
4591
4592 spin_unlock_bh(&sess->conn_lock);
4593 iscsit_cause_connection_reinstatement(conn, 1);
4594 spin_lock_bh(&sess->conn_lock);
4595
4596 iscsit_dec_conn_usage_count(conn);
4597 if (is_last == 0)
4598 iscsit_dec_conn_usage_count(conn_tmp);
4599
4600 conn_count--;
4601 }
4602
4603 if (atomic_read(&sess->nconn)) {
4604 spin_unlock_bh(&sess->conn_lock);
4605 wait_for_completion(&sess->session_wait_comp);
4606 } else
4607 spin_unlock_bh(&sess->conn_lock);
4608
99367f01 4609 target_put_session(sess->se_sess);
e48354ce
NB		 4610 return 0;
4611}
4612
4613void iscsit_stop_session(
4614 struct iscsi_session *sess,
4615 int session_sleep,
4616 int connection_sleep)
4617{
4618 u16 conn_count = atomic_read(&sess->nconn);
4619 struct iscsi_conn *conn, *conn_tmp = NULL;
4620 int is_last;
4621
4622 spin_lock_bh(&sess->conn_lock);
4623 if (session_sleep)
4624 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4625
4626 if (connection_sleep) {
4627 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4628 conn_list) {
4629 if (conn_count == 0)
4630 break;
4631
4632 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4633 is_last = 1;
4634 } else {
4635 iscsit_inc_conn_usage_count(conn_tmp);
4636 is_last = 0;
4637 }
4638 iscsit_inc_conn_usage_count(conn);
4639
4640 spin_unlock_bh(&sess->conn_lock);
4641 iscsit_cause_connection_reinstatement(conn, 1);
4642 spin_lock_bh(&sess->conn_lock);
4643
4644 iscsit_dec_conn_usage_count(conn);
4645 if (is_last == 0)
4646 iscsit_dec_conn_usage_count(conn_tmp);
4647 conn_count--;
4648 }
4649 } else {
4650 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4651 iscsit_cause_connection_reinstatement(conn, 0);
4652 }
4653
4654 if (session_sleep && atomic_read(&sess->nconn)) {
4655 spin_unlock_bh(&sess->conn_lock);
4656 wait_for_completion(&sess->session_wait_comp);
4657 } else
4658 spin_unlock_bh(&sess->conn_lock);
4659}
4660
4661int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4662{
4663 struct iscsi_session *sess;
4664 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4665 struct se_session *se_sess, *se_sess_tmp;
4666 int session_count = 0;
4667
4668 spin_lock_bh(&se_tpg->session_lock);
4669 if (tpg->nsessions && !force) {
4670 spin_unlock_bh(&se_tpg->session_lock);
4671 return -1;
4672 }
4673
4674 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4675 sess_list) {
4676 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4677
4678 spin_lock(&sess->conn_lock);
4679 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4680 atomic_read(&sess->session_logout) ||
4681 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4682 spin_unlock(&sess->conn_lock);
4683 continue;
4684 }
4685 atomic_set(&sess->session_reinstatement, 1);
4686 spin_unlock(&sess->conn_lock);
4687 spin_unlock_bh(&se_tpg->session_lock);
4688
4689 iscsit_free_session(sess);
4690 spin_lock_bh(&se_tpg->session_lock);
4691
4692 session_count++;
4693 }
4694 spin_unlock_bh(&se_tpg->session_lock);
4695
4696 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4697 " Group: %hu\n", session_count, tpg->tpgt);
4698 return 0;
4699}
4700
4701MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4702MODULE_VERSION("4.1.x");
4703MODULE_AUTHOR("nab@Linux-iSCSI.org");
4704MODULE_LICENSE("GPL");
4705
4706module_init(iscsi_target_init_module);
4707module_exit(iscsi_target_cleanup_module);
kernel source for telekom puls (alcatel/mediatek)