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iscsi/isert-target: Refactor ISCSI_OP_NOOP RX handling
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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);
57static DEFINE_SPINLOCK(np_lock);
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
306static struct iscsi_np *iscsit_get_np(
307 struct __kernel_sockaddr_storage *sockaddr,
308 int network_transport)
309{
310 struct iscsi_np *np;
311 bool match;
312
e48354ce
NB		 313 spin_lock_bh(&np_lock);
314 list_for_each_entry(np, &g_np_list, np_list) {
315 spin_lock(&np->np_thread_lock);
316 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
317 spin_unlock(&np->np_thread_lock);
318 continue;
319 }
320
05b96892
NB		 321 match = iscsit_check_np_match(sockaddr, np, network_transport);
322 if (match == true) {
e48354ce
NB		 323 /*
324 * Increment the np_exports reference count now to
325 * prevent iscsit_del_np() below from being called
326 * while iscsi_tpg_add_network_portal() is called.
327 */
328 np->np_exports++;
329 spin_unlock(&np->np_thread_lock);
330 spin_unlock_bh(&np_lock);
331 return np;
332 }
333 spin_unlock(&np->np_thread_lock);
334 }
335 spin_unlock_bh(&np_lock);
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;
349 /*
350 * Locate the existing struct iscsi_np if already active..
351 */
352 np = iscsit_get_np(sockaddr, network_transport);
353 if (np)
354 return np;
355
356 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
357 if (!np) {
358 pr_err("Unable to allocate memory for struct iscsi_np\n");
359 return ERR_PTR(-ENOMEM);
360 }
361
362 np->np_flags |= NPF_IP_NETWORK;
363 if (sockaddr->ss_family == AF_INET6) {
364 sock_in6 = (struct sockaddr_in6 *)sockaddr;
365 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
366 np->np_port = ntohs(sock_in6->sin6_port);
367 } else {
368 sock_in = (struct sockaddr_in *)sockaddr;
369 sprintf(np->np_ip, "%s", ip_str);
370 np->np_port = ntohs(sock_in->sin_port);
371 }
372
373 np->np_network_transport = network_transport;
374 spin_lock_init(&np->np_thread_lock);
375 init_completion(&np->np_restart_comp);
376 INIT_LIST_HEAD(&np->np_list);
377
378 ret = iscsi_target_setup_login_socket(np, sockaddr);
379 if (ret != 0) {
380 kfree(np);
381 return ERR_PTR(ret);
382 }
383
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
388 kfree(np);
389 return ERR_PTR(ret);
390 }
391 /*
392 * Increment the np_exports reference count now to prevent
393 * iscsit_del_np() below from being run while a new call to
394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
395 * active. We don't need to hold np->np_thread_lock at this
396 * point because iscsi_np has not been added to g_np_list yet.
397 */
398 np->np_exports = 1;
399
400 spin_lock_bh(&np_lock);
401 list_add_tail(&np->np_list, &g_np_list);
402 spin_unlock_bh(&np_lock);
403
404 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 405 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 406
407 return np;
408}
409
410int iscsit_reset_np_thread(
411 struct iscsi_np *np,
412 struct iscsi_tpg_np *tpg_np,
413 struct iscsi_portal_group *tpg)
414{
415 spin_lock_bh(&np->np_thread_lock);
416 if (tpg && tpg_np) {
417 /*
418 * The reset operation need only be performed when the
419 * passed struct iscsi_portal_group has a login in progress
420 * to one of the network portals.
421 */
422 if (tpg_np->tpg_np->np_login_tpg != tpg) {
423 spin_unlock_bh(&np->np_thread_lock);
424 return 0;
425 }
426 }
427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
428 spin_unlock_bh(&np->np_thread_lock);
429 return 0;
430 }
431 np->np_thread_state = ISCSI_NP_THREAD_RESET;
432
433 if (np->np_thread) {
434 spin_unlock_bh(&np->np_thread_lock);
435 send_sig(SIGINT, np->np_thread, 1);
436 wait_for_completion(&np->np_restart_comp);
437 spin_lock_bh(&np->np_thread_lock);
438 }
439 spin_unlock_bh(&np->np_thread_lock);
440
441 return 0;
442}
443
baa4d64b 444static void iscsit_free_np(struct iscsi_np *np)
e48354ce 445{
bf6932f4
AV		 446 if (np->np_socket)
447 sock_release(np->np_socket);
e48354ce
NB		 448}
449
450int iscsit_del_np(struct iscsi_np *np)
451{
452 spin_lock_bh(&np->np_thread_lock);
453 np->np_exports--;
454 if (np->np_exports) {
455 spin_unlock_bh(&np->np_thread_lock);
456 return 0;
457 }
458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
459 spin_unlock_bh(&np->np_thread_lock);
460
461 if (np->np_thread) {
462 /*
463 * We need to send the signal to wakeup Linux/Net
464 * which may be sleeping in sock_accept()..
465 */
466 send_sig(SIGINT, np->np_thread, 1);
467 kthread_stop(np->np_thread);
468 }
baa4d64b
NB		 469
470 np->np_transport->iscsit_free_np(np);
e48354ce
NB		 471
472 spin_lock_bh(&np_lock);
473 list_del(&np->np_list);
474 spin_unlock_bh(&np_lock);
475
476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 477 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 478
baa4d64b 479 iscsit_put_transport(np->np_transport);
e48354ce
NB		 480 kfree(np);
481 return 0;
482}
483
2ec5a8c1
NB		 484static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
485static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
486
487static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
488{
489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
490 return 0;
491}
492
baa4d64b
NB		 493static struct iscsit_transport iscsi_target_transport = {
494 .name = "iSCSI/TCP",
495 .transport_type = ISCSI_TCP,
496 .owner = NULL,
497 .iscsit_setup_np = iscsit_setup_np,
498 .iscsit_accept_np = iscsit_accept_np,
499 .iscsit_free_np = iscsit_free_np,
cdb72665 500 .iscsit_alloc_cmd = iscsit_alloc_cmd,
baa4d64b
NB		 501 .iscsit_get_login_rx = iscsit_get_login_rx,
502 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 503 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 504 .iscsit_immediate_queue = iscsit_immediate_queue,
505 .iscsit_response_queue = iscsit_response_queue,
506 .iscsit_queue_data_in = iscsit_queue_rsp,
507 .iscsit_queue_status = iscsit_queue_rsp,
baa4d64b
NB		 508};
509
e48354ce
NB		 510static int __init iscsi_target_init_module(void)
511{
512 int ret = 0;
513
514 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
515
516 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
517 if (!iscsit_global) {
518 pr_err("Unable to allocate memory for iscsit_global\n");
519 return -1;
520 }
521 mutex_init(&auth_id_lock);
522 spin_lock_init(&sess_idr_lock);
523 idr_init(&tiqn_idr);
524 idr_init(&sess_idr);
525
526 ret = iscsi_target_register_configfs();
527 if (ret < 0)
528 goto out;
529
530 ret = iscsi_thread_set_init();
531 if (ret < 0)
532 goto configfs_out;
533
534 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
535 TARGET_THREAD_SET_COUNT) {
536 pr_err("iscsi_allocate_thread_sets() returned"
537 " unexpected value!\n");
538 goto ts_out1;
539 }
540
541 lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
542 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
543 0, NULL);
544 if (!lio_cmd_cache) {
545 pr_err("Unable to kmem_cache_create() for"
546 " lio_cmd_cache\n");
547 goto ts_out2;
548 }
549
550 lio_qr_cache = kmem_cache_create("lio_qr_cache",
551 sizeof(struct iscsi_queue_req),
552 __alignof__(struct iscsi_queue_req), 0, NULL);
553 if (!lio_qr_cache) {
554 pr_err("nable to kmem_cache_create() for"
555 " lio_qr_cache\n");
556 goto cmd_out;
557 }
558
559 lio_dr_cache = kmem_cache_create("lio_dr_cache",
560 sizeof(struct iscsi_datain_req),
561 __alignof__(struct iscsi_datain_req), 0, NULL);
562 if (!lio_dr_cache) {
563 pr_err("Unable to kmem_cache_create() for"
564 " lio_dr_cache\n");
565 goto qr_out;
566 }
567
568 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
569 sizeof(struct iscsi_ooo_cmdsn),
570 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
571 if (!lio_ooo_cache) {
572 pr_err("Unable to kmem_cache_create() for"
573 " lio_ooo_cache\n");
574 goto dr_out;
575 }
576
577 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
578 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
579 0, NULL);
580 if (!lio_r2t_cache) {
581 pr_err("Unable to kmem_cache_create() for"
582 " lio_r2t_cache\n");
583 goto ooo_out;
584 }
585
baa4d64b
NB		 586 iscsit_register_transport(&iscsi_target_transport);
587
e48354ce
NB		 588 if (iscsit_load_discovery_tpg() < 0)
589 goto r2t_out;
590
591 return ret;
592r2t_out:
593 kmem_cache_destroy(lio_r2t_cache);
594ooo_out:
595 kmem_cache_destroy(lio_ooo_cache);
596dr_out:
597 kmem_cache_destroy(lio_dr_cache);
598qr_out:
599 kmem_cache_destroy(lio_qr_cache);
600cmd_out:
601 kmem_cache_destroy(lio_cmd_cache);
602ts_out2:
603 iscsi_deallocate_thread_sets();
604ts_out1:
605 iscsi_thread_set_free();
606configfs_out:
607 iscsi_target_deregister_configfs();
608out:
609 kfree(iscsit_global);
610 return -ENOMEM;
611}
612
613static void __exit iscsi_target_cleanup_module(void)
614{
615 iscsi_deallocate_thread_sets();
616 iscsi_thread_set_free();
617 iscsit_release_discovery_tpg();
baa4d64b 618 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 619 kmem_cache_destroy(lio_cmd_cache);
620 kmem_cache_destroy(lio_qr_cache);
621 kmem_cache_destroy(lio_dr_cache);
622 kmem_cache_destroy(lio_ooo_cache);
623 kmem_cache_destroy(lio_r2t_cache);
624
625 iscsi_target_deregister_configfs();
626
627 kfree(iscsit_global);
628}
629
8b1e1244 630static int iscsit_add_reject(
e48354ce
NB		 631 u8 reason,
632 int fail_conn,
633 unsigned char *buf,
634 struct iscsi_conn *conn)
635{
636 struct iscsi_cmd *cmd;
637 struct iscsi_reject *hdr;
638 int ret;
639
640 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
641 if (!cmd)
642 return -1;
643
644 cmd->iscsi_opcode = ISCSI_OP_REJECT;
645 if (fail_conn)
646 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
647
648 hdr = (struct iscsi_reject *) cmd->pdu;
649 hdr->reason = reason;
650
1c3d5794 651 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 652 if (!cmd->buf_ptr) {
653 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 654 iscsit_free_cmd(cmd, false);
e48354ce
NB		 655 return -1;
656 }
e48354ce
NB		 657
658 spin_lock_bh(&conn->cmd_lock);
2fbb471e 659 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 660 spin_unlock_bh(&conn->cmd_lock);
661
662 cmd->i_state = ISTATE_SEND_REJECT;
663 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
664
665 ret = wait_for_completion_interruptible(&cmd->reject_comp);
666 if (ret != 0)
667 return -1;
668
669 return (!fail_conn) ? 0 : -1;
670}
671
672int iscsit_add_reject_from_cmd(
673 u8 reason,
674 int fail_conn,
675 int add_to_conn,
676 unsigned char *buf,
677 struct iscsi_cmd *cmd)
678{
679 struct iscsi_conn *conn;
680 struct iscsi_reject *hdr;
681 int ret;
682
683 if (!cmd->conn) {
684 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
685 cmd->init_task_tag);
686 return -1;
687 }
688 conn = cmd->conn;
689
690 cmd->iscsi_opcode = ISCSI_OP_REJECT;
691 if (fail_conn)
692 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
693
694 hdr = (struct iscsi_reject *) cmd->pdu;
695 hdr->reason = reason;
696
1c3d5794 697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 698 if (!cmd->buf_ptr) {
699 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 700 iscsit_free_cmd(cmd, false);
e48354ce
NB		 701 return -1;
702 }
e48354ce
NB		 703
704 if (add_to_conn) {
705 spin_lock_bh(&conn->cmd_lock);
2fbb471e 706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 707 spin_unlock_bh(&conn->cmd_lock);
708 }
709
710 cmd->i_state = ISTATE_SEND_REJECT;
711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
712
713 ret = wait_for_completion_interruptible(&cmd->reject_comp);
3e1c81a9
NB		 714 /*
715 * Perform the kref_put now if se_cmd has already been setup by
716 * scsit_setup_scsi_cmd()
717 */
718 if (cmd->se_cmd.se_tfo != NULL) {
719 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
720 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
721 }
e48354ce
NB		 722 if (ret != 0)
723 return -1;
724
725 return (!fail_conn) ? 0 : -1;
726}
3e1c81a9 727EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
e48354ce
NB		 728
729/*
730 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 731 * kernel sockets to copy data in/out.
e48354ce
NB		 732 */
733static int iscsit_map_iovec(
734 struct iscsi_cmd *cmd,
735 struct kvec *iov,
736 u32 data_offset,
737 u32 data_length)
738{
739 u32 i = 0;
740 struct scatterlist *sg;
741 unsigned int page_off;
742
743 /*
bfb79eac 744 * We know each entry in t_data_sg contains a page.
e48354ce 745 */
bfb79eac 746 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 747 page_off = (data_offset % PAGE_SIZE);
748
749 cmd->first_data_sg = sg;
750 cmd->first_data_sg_off = page_off;
751
752 while (data_length) {
753 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
754
755 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
756 iov[i].iov_len = cur_len;
757
758 data_length -= cur_len;
759 page_off = 0;
760 sg = sg_next(sg);
761 i++;
762 }
763
764 cmd->kmapped_nents = i;
765
766 return i;
767}
768
769static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
770{
771 u32 i;
772 struct scatterlist *sg;
773
774 sg = cmd->first_data_sg;
775
776 for (i = 0; i < cmd->kmapped_nents; i++)
777 kunmap(sg_page(&sg[i]));
778}
779
780static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
781{
782 struct iscsi_cmd *cmd;
783
784 conn->exp_statsn = exp_statsn;
785
3e1c81a9
NB		 786 if (conn->sess->sess_ops->RDMAExtensions)
787 return;
788
e48354ce 789 spin_lock_bh(&conn->cmd_lock);
2fbb471e 790 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 791 spin_lock(&cmd->istate_lock);
792 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 793 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 794 cmd->i_state = ISTATE_REMOVE;
795 spin_unlock(&cmd->istate_lock);
796 iscsit_add_cmd_to_immediate_queue(cmd, conn,
797 cmd->i_state);
798 continue;
799 }
800 spin_unlock(&cmd->istate_lock);
801 }
802 spin_unlock_bh(&conn->cmd_lock);
803}
804
805static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
806{
f80e8ed3 807 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 808
c0427f15 809 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 810
811 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
812 if (!cmd->iov_data) {
813 pr_err("Unable to allocate cmd->iov_data\n");
814 return -ENOMEM;
815 }
816
817 cmd->orig_iov_data_count = iov_count;
818 return 0;
819}
820
3e1c81a9
NB		 821int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
822 unsigned char *buf)
e48354ce 823{
3e1c81a9 824 int data_direction, payload_length;
e48354ce 825 struct iscsi_scsi_req *hdr;
d28b1169
AG		 826 int iscsi_task_attr;
827 int sam_task_attr;
e48354ce
NB		 828
829 spin_lock_bh(&conn->sess->session_stats_lock);
830 conn->sess->cmd_pdus++;
831 if (conn->sess->se_sess->se_node_acl) {
832 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
833 conn->sess->se_sess->se_node_acl->num_cmds++;
834 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
835 }
836 spin_unlock_bh(&conn->sess->session_stats_lock);
837
838 hdr = (struct iscsi_scsi_req *) buf;
839 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 840
841 /* FIXME; Add checks for AdditionalHeaderSegment */
842
843 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
844 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
845 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
846 " not set. Bad iSCSI Initiator.\n");
3e1c81a9
NB		 847 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
848 1, 1, buf, cmd);
e48354ce
NB		 849 }
850
851 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
852 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
853 /*
854 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
855 * that adds support for RESERVE/RELEASE. There is a bug
856 * add with this new functionality that sets R/W bits when
857 * neither CDB carries any READ or WRITE datapayloads.
858 */
859 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
860 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
861 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
862 goto done;
863 }
864
865 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
866 " set when Expected Data Transfer Length is 0 for"
867 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
3e1c81a9
NB		 868 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
869 1, 1, buf, cmd);
e48354ce
NB		 870 }
871done:
872
873 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
874 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
876 " MUST be set if Expected Data Transfer Length is not 0."
877 " Bad iSCSI Initiator\n");
3e1c81a9
NB		 878 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
879 1, 1, buf, cmd);
e48354ce
NB		 880 }
881
882 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
883 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
884 pr_err("Bidirectional operations not supported!\n");
3e1c81a9
NB		 885 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
886 1, 1, buf, cmd);
e48354ce
NB		 887 }
888
889 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
890 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
891 " Scsi Command PDU.\n");
3e1c81a9
NB		 892 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
893 1, 1, buf, cmd);
e48354ce
NB		 894 }
895
896 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
897 pr_err("ImmediateData=No but DataSegmentLength=%u,"
898 " protocol error.\n", payload_length);
3e1c81a9
NB		 899 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
900 1, 1, buf, cmd);
e48354ce
NB		 901 }
902
50e5c87d 903 if ((be32_to_cpu(hdr->data_length )== payload_length) &&
e48354ce
NB		 904 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
905 pr_err("Expected Data Transfer Length and Length of"
906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
907 " bit is not set protocol error\n");
3e1c81a9
NB		 908 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
909 1, 1, buf, cmd);
e48354ce
NB		 910 }
911
50e5c87d 912 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 913 pr_err("DataSegmentLength: %u is greater than"
914 " EDTL: %u, protocol error.\n", payload_length,
915 hdr->data_length);
3e1c81a9
NB		 916 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
917 1, 1, buf, cmd);
e48354ce
NB		 918 }
919
21f5aa7e 920 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 921 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 922 " MaxXmitDataSegmentLength: %u, protocol error.\n",
923 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
3e1c81a9
NB		 924 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
925 1, 1, buf, cmd);
e48354ce
NB		 926 }
927
928 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
929 pr_err("DataSegmentLength: %u is greater than"
930 " FirstBurstLength: %u, protocol error.\n",
931 payload_length, conn->sess->sess_ops->FirstBurstLength);
3e1c81a9
NB		 932 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
933 1, 1, buf, cmd);
e48354ce
NB		 934 }
935
936 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
937 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
938 DMA_NONE;
939
d28b1169 940 cmd->data_direction = data_direction;
d28b1169
AG		 941 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
942 /*
943 * Figure out the SAM Task Attribute for the incoming SCSI CDB
944 */
945 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
946 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
947 sam_task_attr = MSG_SIMPLE_TAG;
948 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
949 sam_task_attr = MSG_ORDERED_TAG;
950 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
951 sam_task_attr = MSG_HEAD_TAG;
952 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
953 sam_task_attr = MSG_ACA_TAG;
954 else {
955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
956 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
957 sam_task_attr = MSG_SIMPLE_TAG;
958 }
959
e48354ce
NB		 960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
961 cmd->i_state = ISTATE_NEW_CMD;
962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
963 cmd->immediate_data = (payload_length) ? 1 : 0;
964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
966 if (cmd->unsolicited_data)
967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
968
969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
970 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
971 spin_lock_bh(&conn->sess->ttt_lock);
972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
973 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
974 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
975 spin_unlock_bh(&conn->sess->ttt_lock);
976 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
977 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 978 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
979 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 980 cmd->first_burst_len = payload_length;
981
3e1c81a9
NB		 982 if (!conn->sess->sess_ops->RDMAExtensions &&
983 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 984 struct iscsi_datain_req *dr;
985
986 dr = iscsit_allocate_datain_req();
987 if (!dr)
988 return iscsit_add_reject_from_cmd(
989 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
990 1, 1, buf, cmd);
991
992 iscsit_attach_datain_req(cmd, dr);
993 }
994
065ca1e4
AG		 995 /*
996 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
997 */
998 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 999 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1000 cmd->data_direction, sam_task_attr,
1001 cmd->sense_buffer + 2);
065ca1e4
AG		 1002
1003 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1004 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 1005 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1006 conn->cid);
1007
1008 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 1009
de103c93
CH		 1010 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1011 scsilun_to_int(&hdr->lun));
1012 if (cmd->sense_reason)
1013 goto attach_cmd;
1014
1015 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1016 if (cmd->sense_reason) {
1017 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1018 return iscsit_add_reject_from_cmd(
1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1020 1, 1, buf, cmd);
e48354ce 1021 }
de103c93 1022
e48354ce
NB		 1023 goto attach_cmd;
1024 }
a12f41f8 1025
de103c93 1026 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
e48354ce 1027 return iscsit_add_reject_from_cmd(
de103c93
CH		 1028 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1029 1, 1, buf, cmd);
e48354ce
NB		 1030 }
1031
1032attach_cmd:
1033 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1034 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1035 spin_unlock_bh(&conn->cmd_lock);
1036 /*
1037 * Check if we need to delay processing because of ALUA
1038 * Active/NonOptimized primary access state..
1039 */
1040 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1041
3e1c81a9
NB		 1042 return 0;
1043}
1044EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1045
3e1c81a9
NB		 1046void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1047{
1048 iscsit_set_dataout_sequence_values(cmd);
1049
1050 spin_lock_bh(&cmd->dataout_timeout_lock);
1051 iscsit_start_dataout_timer(cmd, cmd->conn);
1052 spin_unlock_bh(&cmd->dataout_timeout_lock);
1053}
1054EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1055
1056int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1057 struct iscsi_scsi_req *hdr)
1058{
1059 int cmdsn_ret = 0;
e48354ce
NB		 1060 /*
1061 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1062 * the Immediate Bit is not set, and no Immediate
1063 * Data is attached.
1064 *
1065 * A PDU/CmdSN carrying Immediate Data can only
1066 * be processed after the DataCRC has passed.
1067 * If the DataCRC fails, the CmdSN MUST NOT
1068 * be acknowledged. (See below)
1069 */
1070 if (!cmd->immediate_data) {
1071 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
3e1c81a9
NB		 1072 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1073 if (!cmd->sense_reason)
1074 return 0;
1075
1076 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1077 return 0;
3e1c81a9 1078 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
e48354ce
NB		 1079 return iscsit_add_reject_from_cmd(
1080 ISCSI_REASON_PROTOCOL_ERROR,
3e1c81a9
NB		 1081 1, 0, (unsigned char *)hdr, cmd);
1082 }
e48354ce
NB		 1083 }
1084
50e5c87d 1085 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1086
1087 /*
1088 * If no Immediate Data is attached, it's OK to return now.
1089 */
1090 if (!cmd->immediate_data) {
3e1c81a9
NB		 1091 if (!cmd->sense_reason && cmd->unsolicited_data)
1092 iscsit_set_unsoliticed_dataout(cmd);
1093 if (!cmd->sense_reason)
1094 return 0;
e48354ce 1095
3e1c81a9 1096 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1097 return 0;
1098 }
1099
1100 /*
3e1c81a9
NB		 1101 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1102 * execution. These exceptions are processed in CmdSN order using
1103 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1104 */
de103c93 1105 if (cmd->sense_reason) {
3e1c81a9
NB		 1106 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1107 return 1;
e48354ce
NB		 1108 }
1109 /*
1110 * Call directly into transport_generic_new_cmd() to perform
1111 * the backend memory allocation.
1112 */
de103c93
CH		 1113 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1114 if (cmd->sense_reason) {
3e1c81a9
NB		 1115 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1116 return 1;
e48354ce
NB		 1117 }
1118
3e1c81a9
NB		 1119 return 0;
1120}
1121EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1122
1123static int
1124iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1125 bool dump_payload)
1126{
1127 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128 /*
1129 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1130 */
1131 if (dump_payload == true)
1132 goto after_immediate_data;
1133
1134 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1135 cmd->first_burst_len);
e48354ce
NB		 1136after_immediate_data:
1137 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1138 /*
1139 * A PDU/CmdSN carrying Immediate Data passed
1140 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1141 * Immediate Bit is not set.
1142 */
3e1c81a9
NB		 1143 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
1144
de103c93 1145 if (cmd->sense_reason) {
3e1c81a9
NB		 1146 if (iscsit_dump_data_payload(cmd->conn,
1147 cmd->first_burst_len, 1) < 0)
e48354ce 1148 return -1;
3e1c81a9
NB		 1149 } else if (cmd->unsolicited_data)
1150 iscsit_set_unsoliticed_dataout(cmd);
e48354ce
NB		 1151
1152 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1153 return iscsit_add_reject_from_cmd(
1154 ISCSI_REASON_PROTOCOL_ERROR,
3e1c81a9 1155 1, 0, (unsigned char *)hdr, cmd);
e48354ce
NB		 1156
1157 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1158 /*
1159 * Immediate Data failed DataCRC and ERL>=1,
1160 * silently drop this PDU and let the initiator
1161 * plug the CmdSN gap.
1162 *
1163 * FIXME: Send Unsolicited NOPIN with reserved
1164 * TTT here to help the initiator figure out
1165 * the missing CmdSN, although they should be
1166 * intelligent enough to determine the missing
1167 * CmdSN and issue a retry to plug the sequence.
1168 */
1169 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1170 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1171 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1172 return -1;
1173
1174 return 0;
1175}
1176
3e1c81a9
NB		 1177static int
1178iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1179 unsigned char *buf)
1180{
1181 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1182 int rc, immed_data;
1183 bool dump_payload = false;
1184
1185 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1186 if (rc < 0)
1187 return rc;
1188 /*
1189 * Allocation iovecs needed for struct socket operations for
1190 * traditional iSCSI block I/O.
1191 */
1192 if (iscsit_allocate_iovecs(cmd) < 0) {
1193 return iscsit_add_reject_from_cmd(
1194 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1195 1, 0, buf, cmd);
1196 }
1197 immed_data = cmd->immediate_data;
1198
1199 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1200 if (rc < 0)
1201 return rc;
1202 else if (rc > 0)
1203 dump_payload = true;
1204
1205 if (!immed_data)
1206 return 0;
1207
1208 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1209}
1210
e48354ce
NB		 1211static u32 iscsit_do_crypto_hash_sg(
1212 struct hash_desc *hash,
1213 struct iscsi_cmd *cmd,
1214 u32 data_offset,
1215 u32 data_length,
1216 u32 padding,
1217 u8 *pad_bytes)
1218{
1219 u32 data_crc;
1220 u32 i;
1221 struct scatterlist *sg;
1222 unsigned int page_off;
1223
1224 crypto_hash_init(hash);
1225
1226 sg = cmd->first_data_sg;
1227 page_off = cmd->first_data_sg_off;
1228
1229 i = 0;
1230 while (data_length) {
1231 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1232
1233 crypto_hash_update(hash, &sg[i], cur_len);
1234
1235 data_length -= cur_len;
1236 page_off = 0;
1237 i++;
1238 }
1239
1240 if (padding) {
1241 struct scatterlist pad_sg;
1242
1243 sg_init_one(&pad_sg, pad_bytes, padding);
1244 crypto_hash_update(hash, &pad_sg, padding);
1245 }
1246 crypto_hash_final(hash, (u8 *) &data_crc);
1247
1248 return data_crc;
1249}
1250
1251static void iscsit_do_crypto_hash_buf(
1252 struct hash_desc *hash,
80690fdb 1253 const void *buf,
e48354ce
NB		 1254 u32 payload_length,
1255 u32 padding,
1256 u8 *pad_bytes,
1257 u8 *data_crc)
1258{
1259 struct scatterlist sg;
1260
1261 crypto_hash_init(hash);
1262
8359cf43 1263 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1264 crypto_hash_update(hash, &sg, payload_length);
1265
1266 if (padding) {
1267 sg_init_one(&sg, pad_bytes, padding);
1268 crypto_hash_update(hash, &sg, padding);
1269 }
1270 crypto_hash_final(hash, data_crc);
1271}
1272
3e1c81a9
NB		 1273int
1274iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1275 struct iscsi_cmd **out_cmd)
e48354ce 1276{
3e1c81a9 1277 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1278 struct iscsi_cmd *cmd = NULL;
1279 struct se_cmd *se_cmd;
3e1c81a9
NB		 1280 u32 payload_length = ntoh24(hdr->dlength);
1281 int rc;
e48354ce
NB		 1282
1283 if (!payload_length) {
1284 pr_err("DataOUT payload is ZERO, protocol error.\n");
1285 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1286 buf, conn);
1287 }
1288
1289 /* iSCSI write */
1290 spin_lock_bh(&conn->sess->session_stats_lock);
1291 conn->sess->rx_data_octets += payload_length;
1292 if (conn->sess->se_sess->se_node_acl) {
1293 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1294 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1295 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1296 }
1297 spin_unlock_bh(&conn->sess->session_stats_lock);
1298
21f5aa7e 1299 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1300 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1301 " MaxXmitDataSegmentLength: %u\n", payload_length,
1302 conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 1303 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1304 buf, conn);
1305 }
1306
1307 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1308 payload_length);
1309 if (!cmd)
1310 return 0;
1311
1312 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1313 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1314 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1315 payload_length, conn->cid);
1316
1317 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1318 pr_err("Command ITT: 0x%08x received DataOUT after"
1319 " last DataOUT received, dumping payload\n",
1320 cmd->init_task_tag);
1321 return iscsit_dump_data_payload(conn, payload_length, 1);
1322 }
1323
1324 if (cmd->data_direction != DMA_TO_DEVICE) {
1325 pr_err("Command ITT: 0x%08x received DataOUT for a"
1326 " NON-WRITE command.\n", cmd->init_task_tag);
1327 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1328 1, 0, buf, cmd);
1329 }
1330 se_cmd = &cmd->se_cmd;
1331 iscsit_mod_dataout_timer(cmd);
1332
50e5c87d 1333 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1334 pr_err("DataOut Offset: %u, Length %u greater than"
1335 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1336 hdr->offset, payload_length, cmd->se_cmd.data_length);
e48354ce
NB		 1337 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1338 1, 0, buf, cmd);
1339 }
1340
1341 if (cmd->unsolicited_data) {
1342 int dump_unsolicited_data = 0;
1343
1344 if (conn->sess->sess_ops->InitialR2T) {
1345 pr_err("Received unexpected unsolicited data"
1346 " while InitialR2T=Yes, protocol error.\n");
1347 transport_send_check_condition_and_sense(&cmd->se_cmd,
1348 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1349 return -1;
1350 }
1351 /*
1352 * Special case for dealing with Unsolicited DataOUT
1353 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1354 * failures;
1355 */
1356
1357 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1358 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1359 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1360 dump_unsolicited_data = 1;
e48354ce
NB		 1361
1362 if (dump_unsolicited_data) {
1363 /*
1364 * Check if a delayed TASK_ABORTED status needs to
1365 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1366 * received with the unsolicitied data out.
1367 */
1368 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369 iscsit_stop_dataout_timer(cmd);
1370
1371 transport_check_aborted_status(se_cmd,
1372 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1373 return iscsit_dump_data_payload(conn, payload_length, 1);
1374 }
1375 } else {
1376 /*
1377 * For the normal solicited data path:
1378 *
1379 * Check for a delayed TASK_ABORTED status and dump any
1380 * incoming data out payload if one exists. Also, when the
1381 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1382 * data out sequence, we decrement outstanding_r2ts. Once
1383 * outstanding_r2ts reaches zero, go ahead and send the delayed
1384 * TASK_ABORTED status.
1385 */
7d680f3b 1386 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1387 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1388 if (--cmd->outstanding_r2ts < 1) {
1389 iscsit_stop_dataout_timer(cmd);
1390 transport_check_aborted_status(
1391 se_cmd, 1);
1392 }
1393
1394 return iscsit_dump_data_payload(conn, payload_length, 1);
1395 }
1396 }
1397 /*
1398 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1399 * within-command recovery checks before receiving the payload.
1400 */
3e1c81a9
NB		 1401 rc = iscsit_check_pre_dataout(cmd, buf);
1402 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1403 return 0;
3e1c81a9 1404 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1405 return -1;
1406
3e1c81a9
NB		 1407 *out_cmd = cmd;
1408 return 0;
1409}
1410EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1411
1412static int
1413iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1414 struct iscsi_data *hdr)
1415{
1416 struct kvec *iov;
1417 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1418 u32 payload_length = ntoh24(hdr->dlength);
1419 int iov_ret, data_crc_failed = 0;
1420
e48354ce
NB		 1421 rx_size += payload_length;
1422 iov = &cmd->iov_data[0];
1423
50e5c87d
CH		 1424 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1425 payload_length);
e48354ce
NB		 1426 if (iov_ret < 0)
1427 return -1;
1428
1429 iov_count += iov_ret;
1430
1431 padding = ((-payload_length) & 3);
1432 if (padding != 0) {
1433 iov[iov_count].iov_base = cmd->pad_bytes;
1434 iov[iov_count++].iov_len = padding;
1435 rx_size += padding;
1436 pr_debug("Receiving %u padding bytes.\n", padding);
1437 }
1438
1439 if (conn->conn_ops->DataDigest) {
1440 iov[iov_count].iov_base = &checksum;
1441 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1442 rx_size += ISCSI_CRC_LEN;
1443 }
1444
1445 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1446
1447 iscsit_unmap_iovec(cmd);
1448
1449 if (rx_got != rx_size)
1450 return -1;
1451
1452 if (conn->conn_ops->DataDigest) {
1453 u32 data_crc;
1454
1455 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1456 be32_to_cpu(hdr->offset),
1457 payload_length, padding,
e48354ce
NB		 1458 cmd->pad_bytes);
1459
1460 if (checksum != data_crc) {
1461 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1462 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1463 " does not match computed 0x%08x\n",
1464 hdr->itt, hdr->offset, payload_length,
1465 hdr->datasn, checksum, data_crc);
1466 data_crc_failed = 1;
1467 } else {
1468 pr_debug("Got CRC32C DataDigest 0x%08x for"
1469 " %u bytes of Data Out\n", checksum,
1470 payload_length);
1471 }
1472 }
3e1c81a9
NB		 1473
1474 return data_crc_failed;
1475}
1476
1477int
1478iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1479 bool data_crc_failed)
1480{
1481 struct iscsi_conn *conn = cmd->conn;
1482 int rc, ooo_cmdsn;
e48354ce
NB		 1483 /*
1484 * Increment post receive data and CRC values or perform
1485 * within-command recovery.
1486 */
3e1c81a9
NB		 1487 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1488 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1489 return 0;
3e1c81a9 1490 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1491 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1492 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1493 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1494 /*
1495 * Handle extra special case for out of order
1496 * Unsolicited Data Out.
1497 */
1498 spin_lock_bh(&cmd->istate_lock);
1499 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1500 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1501 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1502 spin_unlock_bh(&cmd->istate_lock);
1503
1504 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1505 if (ooo_cmdsn)
1506 return 0;
1507 target_execute_cmd(&cmd->se_cmd);
1508 return 0;
e48354ce
NB		 1509 } else /* DATAOUT_CANNOT_RECOVER */
1510 return -1;
1511
1512 return 0;
1513}
3e1c81a9 1514EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1515
3e1c81a9
NB		 1516static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1517{
1518 struct iscsi_cmd *cmd;
1519 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1520 int rc;
1521 bool data_crc_failed = false;
1522
1523 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1524 if (rc < 0)
1525 return rc;
1526 else if (!cmd)
1527 return 0;
1528
1529 rc = iscsit_get_dataout(conn, cmd, hdr);
1530 if (rc < 0)
1531 return rc;
1532 else if (rc > 0)
1533 data_crc_failed = true;
1534
1535 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1536}
1537
778de368
NB		 1538int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1539 struct iscsi_nopout *hdr)
e48354ce 1540{
778de368 1541 u32 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");
778de368
NB		 1546 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1547 1, 0, (unsigned char *)hdr, cmd);
e48354ce
NB		 1548 }
1549
21f5aa7e 1550 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1551 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1552 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1553 " error.\n", payload_length,
21f5aa7e 1554 conn->conn_ops->MaxXmitDataSegmentLength);
778de368
NB		 1555 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1556 1, 0, (unsigned char *)hdr, cmd);
e48354ce
NB		 1557 }
1558
3e1c81a9 1559 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1560 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1561 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1562 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563 payload_length);
1564 /*
1565 * This is not a response to a Unsolicited NopIN, which means
1566 * it can either be a NOPOUT ping request (with a valid ITT),
1567 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568 * Either way, make sure we allocate an struct iscsi_cmd, as both
1569 * can contain ping data.
1570 */
50e5c87d 1571 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1572 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1573 cmd->i_state = ISTATE_SEND_NOPIN;
1574 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575 1 : 0);
1576 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1578 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1579 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1580 cmd->data_direction = DMA_NONE;
1581 }
1582
778de368
NB		 1583 return 0;
1584}
1585EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588 struct iscsi_nopout *hdr)
1589{
1590 struct iscsi_cmd *cmd_p = NULL;
1591 int cmdsn_ret = 0;
1592 /*
1593 * Initiator is expecting a NopIN ping reply..
1594 */
1595 if (hdr->itt != RESERVED_ITT) {
1596 BUG_ON(!cmd);
1597
1598 spin_lock_bh(&conn->cmd_lock);
1599 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1600 spin_unlock_bh(&conn->cmd_lock);
1601
1602 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1603
1604 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1605 iscsit_add_cmd_to_response_queue(cmd, conn,
1606 cmd->i_state);
1607 return 0;
1608 }
1609
1610 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1611 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1612 return 0;
1613
1614 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615 return iscsit_add_reject_from_cmd(
1616 ISCSI_REASON_PROTOCOL_ERROR,
1617 1, 0, (unsigned char *)hdr, cmd);
1618
1619 return 0;
1620 }
1621 /*
1622 * This was a response to a unsolicited NOPIN ping.
1623 */
1624 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626 if (!cmd_p)
1627 return -EINVAL;
1628
1629 iscsit_stop_nopin_response_timer(conn);
1630
1631 cmd_p->i_state = ISTATE_REMOVE;
1632 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634 iscsit_start_nopin_timer(conn);
1635 return 0;
1636 }
1637 /*
1638 * Otherwise, initiator is not expecting a NOPIN is response.
1639 * Just ignore for now.
1640 */
1641 return 0;
1642}
1643EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646 unsigned char *buf)
1647{
1648 unsigned char *ping_data = NULL;
1649 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650 struct kvec *iov = NULL;
1651 u32 payload_length = ntoh24(hdr->dlength);
1652 int ret;
1653
1654 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655 if (ret < 0)
1656 return ret;
1657 /*
1658 * Handle NOP-OUT payload for traditional iSCSI sockets
1659 */
50e5c87d 1660 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1661 u32 checksum, data_crc, padding = 0;
1662 int niov = 0, rx_got, rx_size = payload_length;
1663
e48354ce
NB		 1664 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665 if (!ping_data) {
1666 pr_err("Unable to allocate memory for"
1667 " NOPOUT ping data.\n");
1668 ret = -1;
1669 goto out;
1670 }
1671
1672 iov = &cmd->iov_misc[0];
1673 iov[niov].iov_base = ping_data;
1674 iov[niov++].iov_len = payload_length;
1675
1676 padding = ((-payload_length) & 3);
1677 if (padding != 0) {
1678 pr_debug("Receiving %u additional bytes"
1679 " for padding.\n", padding);
1680 iov[niov].iov_base = &cmd->pad_bytes;
1681 iov[niov++].iov_len = padding;
1682 rx_size += padding;
1683 }
1684 if (conn->conn_ops->DataDigest) {
1685 iov[niov].iov_base = &checksum;
1686 iov[niov++].iov_len = ISCSI_CRC_LEN;
1687 rx_size += ISCSI_CRC_LEN;
1688 }
1689
1690 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691 if (rx_got != rx_size) {
1692 ret = -1;
1693 goto out;
1694 }
1695
1696 if (conn->conn_ops->DataDigest) {
1697 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698 ping_data, payload_length,
1699 padding, cmd->pad_bytes,
1700 (u8 *)&data_crc);
1701
1702 if (checksum != data_crc) {
1703 pr_err("Ping data CRC32C DataDigest"
1704 " 0x%08x does not match computed 0x%08x\n",
1705 checksum, data_crc);
1706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707 pr_err("Unable to recover from"
1708 " NOPOUT Ping DataCRC failure while in"
1709 " ERL=0.\n");
1710 ret = -1;
1711 goto out;
1712 } else {
1713 /*
1714 * Silently drop this PDU and let the
1715 * initiator plug the CmdSN gap.
1716 */
1717 pr_debug("Dropping NOPOUT"
1718 " Command CmdSN: 0x%08x due to"
1719 " DataCRC error.\n", hdr->cmdsn);
1720 ret = 0;
1721 goto out;
1722 }
1723 } else {
1724 pr_debug("Got CRC32C DataDigest"
1725 " 0x%08x for %u bytes of ping data.\n",
1726 checksum, payload_length);
1727 }
1728 }
1729
1730 ping_data[payload_length] = '\0';
1731 /*
1732 * Attach ping data to struct iscsi_cmd->buf_ptr.
1733 */
8359cf43 1734 cmd->buf_ptr = ping_data;
e48354ce
NB		 1735 cmd->buf_ptr_size = payload_length;
1736
1737 pr_debug("Got %u bytes of NOPOUT ping"
1738 " data.\n", payload_length);
1739 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740 }
1741
778de368 1742 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1743out:
1744 if (cmd)
aafc9d15 1745 iscsit_free_cmd(cmd, false);
778de368 1746
e48354ce
NB		 1747 kfree(ping_data);
1748 return ret;
1749}
1750
3e1c81a9
NB		 1751int
1752iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753 unsigned char *buf)
e48354ce 1754{
e48354ce
NB		 1755 struct se_tmr_req *se_tmr;
1756 struct iscsi_tmr_req *tmr_req;
1757 struct iscsi_tm *hdr;
e48354ce
NB		 1758 int out_of_order_cmdsn = 0;
1759 int ret;
1760 u8 function;
1761
1762 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1763 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764 function = hdr->flags;
1765
1766 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1773 hdr->rtt != RESERVED_ITT)) {
e48354ce 1774 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1775 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1776 }
1777
1778 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780 pr_err("Task Management Request TASK_REASSIGN not"
1781 " issued as immediate command, bad iSCSI Initiator"
1782 "implementation\n");
3e1c81a9
NB		 1783 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1784 1, 1, buf, cmd);
e48354ce
NB		 1785 }
1786 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1787 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1789
d28b1169
AG		 1790 cmd->data_direction = DMA_NONE;
1791
1792 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793 if (!cmd->tmr_req) {
1794 pr_err("Unable to allocate memory for"
1795 " Task Management command!\n");
1796 return iscsit_add_reject_from_cmd(
1797 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798 1, 1, buf, cmd);
1799 }
1800
1801 /*
1802 * TASK_REASSIGN for ERL=2 / connection stays inside of
1803 * LIO-Target $FABRIC_MOD
1804 */
1805 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807 u8 tcm_function;
1808 int ret;
1809
1810 transport_init_se_cmd(&cmd->se_cmd,
1811 &lio_target_fabric_configfs->tf_ops,
1812 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1813 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169
AG		 1814
1815 switch (function) {
1816 case ISCSI_TM_FUNC_ABORT_TASK:
1817 tcm_function = TMR_ABORT_TASK;
1818 break;
1819 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1820 tcm_function = TMR_ABORT_TASK_SET;
1821 break;
1822 case ISCSI_TM_FUNC_CLEAR_ACA:
1823 tcm_function = TMR_CLEAR_ACA;
1824 break;
1825 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1826 tcm_function = TMR_CLEAR_TASK_SET;
1827 break;
1828 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1829 tcm_function = TMR_LUN_RESET;
1830 break;
1831 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1832 tcm_function = TMR_TARGET_WARM_RESET;
1833 break;
1834 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1835 tcm_function = TMR_TARGET_COLD_RESET;
1836 break;
1837 default:
1838 pr_err("Unknown iSCSI TMR Function:"
1839 " 0x%02x\n", function);
1840 return iscsit_add_reject_from_cmd(
1841 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1842 1, 1, buf, cmd);
1843 }
1844
1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846 tcm_function, GFP_KERNEL);
1847 if (ret < 0)
1848 return iscsit_add_reject_from_cmd(
1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1850 1, 1, buf, cmd);
1851
1852 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1853 }
e48354ce
NB		 1854
1855 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1856 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1857 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858 cmd->init_task_tag = hdr->itt;
1859 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1860 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1861 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1862 se_tmr = cmd->se_cmd.se_tmr_req;
1863 tmr_req = cmd->tmr_req;
1864 /*
1865 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866 */
1867 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1868 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869 scsilun_to_int(&hdr->lun));
e48354ce 1870 if (ret < 0) {
e48354ce
NB		 1871 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872 goto attach;
1873 }
1874 }
1875
1876 switch (function) {
1877 case ISCSI_TM_FUNC_ABORT_TASK:
1878 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1879 if (se_tmr->response)
e48354ce 1880 goto attach;
e48354ce
NB		 1881 break;
1882 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883 case ISCSI_TM_FUNC_CLEAR_ACA:
1884 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886 break;
1887 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1889 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1890 goto attach;
1891 }
1892 break;
1893 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1895 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1896 goto attach;
1897 }
1898 break;
1899 case ISCSI_TM_FUNC_TASK_REASSIGN:
1900 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901 /*
1902 * Perform sanity checks on the ExpDataSN only if the
1903 * TASK_REASSIGN was successful.
1904 */
de103c93 1905 if (se_tmr->response)
e48354ce
NB		 1906 break;
1907
1908 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909 return iscsit_add_reject_from_cmd(
1910 ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1911 buf, cmd);
1912 break;
1913 default:
1914 pr_err("Unknown TMR function: 0x%02x, protocol"
1915 " error.\n", function);
e48354ce
NB		 1916 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1917 goto attach;
1918 }
1919
1920 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1921 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1922 se_tmr->call_transport = 1;
1923attach:
1924 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1925 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1926 spin_unlock_bh(&conn->cmd_lock);
1927
1928 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1929 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1930 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1931 out_of_order_cmdsn = 1;
5a4c8666 1932 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1933 return 0;
5a4c8666 1934 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
e48354ce
NB		 1935 return iscsit_add_reject_from_cmd(
1936 ISCSI_REASON_PROTOCOL_ERROR,
1937 1, 0, buf, cmd);
e48354ce 1938 }
50e5c87d 1939 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1940
5a4c8666 1941 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1942 return 0;
1943 /*
1944 * Found the referenced task, send to transport for processing.
1945 */
1946 if (se_tmr->call_transport)
1947 return transport_generic_handle_tmr(&cmd->se_cmd);
1948
1949 /*
1950 * Could not find the referenced LUN, task, or Task Management
1951 * command not authorized or supported. Change state and
1952 * let the tx_thread send the response.
1953 *
1954 * For connection recovery, this is also the default action for
1955 * TMR TASK_REASSIGN.
1956 */
1957 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1958 return 0;
1959}
3e1c81a9 1960EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1961
1962/* #warning FIXME: Support Text Command parameters besides SendTargets */
1963static int iscsit_handle_text_cmd(
1964 struct iscsi_conn *conn,
1965 unsigned char *buf)
1966{
1967 char *text_ptr, *text_in;
1968 int cmdsn_ret, niov = 0, rx_got, rx_size;
1969 u32 checksum = 0, data_crc = 0, payload_length;
76f1928e 1970 u32 padding = 0, pad_bytes = 0, text_length = 0;
e48354ce
NB		 1971 struct iscsi_cmd *cmd;
1972 struct kvec iov[3];
1973 struct iscsi_text *hdr;
1974
1975 hdr = (struct iscsi_text *) buf;
1976 payload_length = ntoh24(hdr->dlength);
e48354ce 1977
21f5aa7e 1978 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1979 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1980 "greater than MaxXmitDataSegmentLength %u.\n",
1981 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
e48354ce
NB		 1982 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1983 buf, conn);
1984 }
1985
1986 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1987 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1988 hdr->exp_statsn, payload_length);
1989
1990 rx_size = text_length = payload_length;
1991 if (text_length) {
1992 text_in = kzalloc(text_length, GFP_KERNEL);
1993 if (!text_in) {
1994 pr_err("Unable to allocate memory for"
1995 " incoming text parameters\n");
1996 return -1;
1997 }
1998
1999 memset(iov, 0, 3 * sizeof(struct kvec));
2000 iov[niov].iov_base = text_in;
2001 iov[niov++].iov_len = text_length;
2002
2003 padding = ((-payload_length) & 3);
2004 if (padding != 0) {
76f1928e 2005 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2006 iov[niov++].iov_len = padding;
2007 rx_size += padding;
2008 pr_debug("Receiving %u additional bytes"
2009 " for padding.\n", padding);
2010 }
2011 if (conn->conn_ops->DataDigest) {
2012 iov[niov].iov_base = &checksum;
2013 iov[niov++].iov_len = ISCSI_CRC_LEN;
2014 rx_size += ISCSI_CRC_LEN;
2015 }
2016
2017 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2018 if (rx_got != rx_size) {
2019 kfree(text_in);
2020 return -1;
2021 }
2022
2023 if (conn->conn_ops->DataDigest) {
2024 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2025 text_in, text_length,
76f1928e 2026 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2027 (u8 *)&data_crc);
2028
2029 if (checksum != data_crc) {
2030 pr_err("Text data CRC32C DataDigest"
2031 " 0x%08x does not match computed"
2032 " 0x%08x\n", checksum, data_crc);
2033 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2034 pr_err("Unable to recover from"
2035 " Text Data digest failure while in"
2036 " ERL=0.\n");
2037 kfree(text_in);
2038 return -1;
2039 } else {
2040 /*
2041 * Silently drop this PDU and let the
2042 * initiator plug the CmdSN gap.
2043 */
2044 pr_debug("Dropping Text"
2045 " Command CmdSN: 0x%08x due to"
2046 " DataCRC error.\n", hdr->cmdsn);
2047 kfree(text_in);
2048 return 0;
2049 }
2050 } else {
2051 pr_debug("Got CRC32C DataDigest"
2052 " 0x%08x for %u bytes of text data.\n",
2053 checksum, text_length);
2054 }
2055 }
2056 text_in[text_length - 1] = '\0';
2057 pr_debug("Successfully read %d bytes of text"
2058 " data.\n", text_length);
2059
2060 if (strncmp("SendTargets", text_in, 11) != 0) {
2061 pr_err("Received Text Data that is not"
2062 " SendTargets, cannot continue.\n");
2063 kfree(text_in);
2064 return -1;
2065 }
2066 text_ptr = strchr(text_in, '=');
2067 if (!text_ptr) {
2068 pr_err("No \"=\" separator found in Text Data,"
2069 " cannot continue.\n");
2070 kfree(text_in);
2071 return -1;
2072 }
2073 if (strncmp("=All", text_ptr, 4) != 0) {
2074 pr_err("Unable to locate All value for"
2075 " SendTargets key, cannot continue.\n");
2076 kfree(text_in);
2077 return -1;
2078 }
2079/*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2080 kfree(text_in);
2081 }
2082
2083 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2084 if (!cmd)
2085 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2086 1, buf, conn);
2087
2088 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2089 cmd->i_state = ISTATE_SEND_TEXTRSP;
2090 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2091 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2092 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2093 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2094 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2095 cmd->data_direction = DMA_NONE;
2096
2097 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2098 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2099 spin_unlock_bh(&conn->cmd_lock);
2100
50e5c87d 2101 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2102
2103 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2104 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2105 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2106 return iscsit_add_reject_from_cmd(
2107 ISCSI_REASON_PROTOCOL_ERROR,
2108 1, 0, buf, cmd);
2109
2110 return 0;
2111 }
2112
2113 return iscsit_execute_cmd(cmd, 0);
2114}
2115
2116int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2117{
2118 struct iscsi_conn *conn_p;
2119 struct iscsi_session *sess = conn->sess;
2120
2121 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2122 " for SID: %u.\n", conn->cid, conn->sess->sid);
2123
2124 atomic_set(&sess->session_logout, 1);
2125 atomic_set(&conn->conn_logout_remove, 1);
2126 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2127
2128 iscsit_inc_conn_usage_count(conn);
2129 iscsit_inc_session_usage_count(sess);
2130
2131 spin_lock_bh(&sess->conn_lock);
2132 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2133 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2134 continue;
2135
2136 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2137 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2138 }
2139 spin_unlock_bh(&sess->conn_lock);
2140
2141 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2142
2143 return 0;
2144}
2145
2146int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2147{
2148 struct iscsi_conn *l_conn;
2149 struct iscsi_session *sess = conn->sess;
2150
2151 pr_debug("Received logout request CLOSECONNECTION for CID:"
2152 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2153
2154 /*
2155 * A Logout Request with a CLOSECONNECTION reason code for a CID
2156 * can arrive on a connection with a differing CID.
2157 */
2158 if (conn->cid == cmd->logout_cid) {
2159 spin_lock_bh(&conn->state_lock);
2160 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2161 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2162
2163 atomic_set(&conn->conn_logout_remove, 1);
2164 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2165 iscsit_inc_conn_usage_count(conn);
2166
2167 spin_unlock_bh(&conn->state_lock);
2168 } else {
2169 /*
2170 * Handle all different cid CLOSECONNECTION requests in
2171 * iscsit_logout_post_handler_diffcid() as to give enough
2172 * time for any non immediate command's CmdSN to be
2173 * acknowledged on the connection in question.
2174 *
2175 * Here we simply make sure the CID is still around.
2176 */
2177 l_conn = iscsit_get_conn_from_cid(sess,
2178 cmd->logout_cid);
2179 if (!l_conn) {
2180 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2181 iscsit_add_cmd_to_response_queue(cmd, conn,
2182 cmd->i_state);
2183 return 0;
2184 }
2185
2186 iscsit_dec_conn_usage_count(l_conn);
2187 }
2188
2189 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2190
2191 return 0;
2192}
2193
2194int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2195{
2196 struct iscsi_session *sess = conn->sess;
2197
2198 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2199 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2200
2201 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2202 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2203 " while ERL!=2.\n");
2204 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2205 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2206 return 0;
2207 }
2208
2209 if (conn->cid == cmd->logout_cid) {
2210 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2211 " with CID: %hu on CID: %hu, implementation error.\n",
2212 cmd->logout_cid, conn->cid);
2213 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2214 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2215 return 0;
2216 }
2217
2218 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2219
2220 return 0;
2221}
2222
3e1c81a9
NB		 2223int
2224iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2225 unsigned char *buf)
e48354ce
NB		 2226{
2227 int cmdsn_ret, logout_remove = 0;
2228 u8 reason_code = 0;
e48354ce
NB		 2229 struct iscsi_logout *hdr;
2230 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2231
2232 hdr = (struct iscsi_logout *) buf;
2233 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2234
2235 if (tiqn) {
2236 spin_lock(&tiqn->logout_stats.lock);
2237 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2238 tiqn->logout_stats.normal_logouts++;
2239 else
2240 tiqn->logout_stats.abnormal_logouts++;
2241 spin_unlock(&tiqn->logout_stats.lock);
2242 }
2243
2244 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2245 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2246 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2247 hdr->cid, conn->cid);
2248
2249 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2250 pr_err("Received logout request on connection that"
2251 " is not in logged in state, ignoring request.\n");
aafc9d15 2252 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2253 return 0;
2254 }
2255
e48354ce
NB		 2256 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2257 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2258 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2259 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2260 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2261 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2262 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2263 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2264 cmd->logout_reason = reason_code;
2265 cmd->data_direction = DMA_NONE;
2266
2267 /*
2268 * We need to sleep in these cases (by returning 1) until the Logout
2269 * Response gets sent in the tx thread.
2270 */
2271 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2272 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2273 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2274 logout_remove = 1;
2275
2276 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2277 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2278 spin_unlock_bh(&conn->cmd_lock);
2279
2280 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2281 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2282
2283 /*
2284 * Immediate commands are executed, well, immediately.
2285 * Non-Immediate Logout Commands are executed in CmdSN order.
2286 */
c6037cc5 2287 if (cmd->immediate_cmd) {
e48354ce
NB		 2288 int ret = iscsit_execute_cmd(cmd, 0);
2289
2290 if (ret < 0)
2291 return ret;
2292 } else {
2293 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2294 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2295 logout_remove = 0;
2296 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2297 return iscsit_add_reject_from_cmd(
2298 ISCSI_REASON_PROTOCOL_ERROR,
2299 1, 0, buf, cmd);
2300 }
2301 }
2302
2303 return logout_remove;
2304}
3e1c81a9 2305EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2306
2307static int iscsit_handle_snack(
2308 struct iscsi_conn *conn,
2309 unsigned char *buf)
2310{
e48354ce
NB		 2311 struct iscsi_snack *hdr;
2312
2313 hdr = (struct iscsi_snack *) buf;
2314 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2315
2316 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2317 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2318 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2319 hdr->begrun, hdr->runlength, conn->cid);
2320
2321 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2322 pr_err("Initiator sent SNACK request while in"
2323 " ErrorRecoveryLevel=0.\n");
2324 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2325 buf, conn);
2326 }
2327 /*
2328 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2329 * call from inside iscsi_send_recovery_datain_or_r2t().
2330 */
2331 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2332 case 0:
2333 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2334 hdr->itt,
2335 be32_to_cpu(hdr->ttt),
2336 be32_to_cpu(hdr->begrun),
2337 be32_to_cpu(hdr->runlength));
e48354ce 2338 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2339 return iscsit_handle_status_snack(conn, hdr->itt,
2340 be32_to_cpu(hdr->ttt),
2341 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2342 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2343 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2344 be32_to_cpu(hdr->begrun),
2345 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2346 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2347 /* FIXME: Support R-Data SNACK */
2348 pr_err("R-Data SNACK Not Supported.\n");
2349 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2350 buf, conn);
2351 default:
2352 pr_err("Unknown SNACK type 0x%02x, protocol"
2353 " error.\n", hdr->flags & 0x0f);
2354 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2355 buf, conn);
2356 }
2357
2358 return 0;
2359}
2360
2361static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2362{
2363 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2364 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2365 wait_for_completion_interruptible_timeout(
2366 &conn->rx_half_close_comp,
2367 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2368 }
2369}
2370
2371static int iscsit_handle_immediate_data(
2372 struct iscsi_cmd *cmd,
3e1c81a9 2373 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2374 u32 length)
2375{
2376 int iov_ret, rx_got = 0, rx_size = 0;
2377 u32 checksum, iov_count = 0, padding = 0;
2378 struct iscsi_conn *conn = cmd->conn;
2379 struct kvec *iov;
2380
2381 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2382 if (iov_ret < 0)
2383 return IMMEDIATE_DATA_CANNOT_RECOVER;
2384
2385 rx_size = length;
2386 iov_count = iov_ret;
2387 iov = &cmd->iov_data[0];
2388
2389 padding = ((-length) & 3);
2390 if (padding != 0) {
2391 iov[iov_count].iov_base = cmd->pad_bytes;
2392 iov[iov_count++].iov_len = padding;
2393 rx_size += padding;
2394 }
2395
2396 if (conn->conn_ops->DataDigest) {
2397 iov[iov_count].iov_base = &checksum;
2398 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2399 rx_size += ISCSI_CRC_LEN;
2400 }
2401
2402 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2403
2404 iscsit_unmap_iovec(cmd);
2405
2406 if (rx_got != rx_size) {
2407 iscsit_rx_thread_wait_for_tcp(conn);
2408 return IMMEDIATE_DATA_CANNOT_RECOVER;
2409 }
2410
2411 if (conn->conn_ops->DataDigest) {
2412 u32 data_crc;
2413
2414 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2415 cmd->write_data_done, length, padding,
2416 cmd->pad_bytes);
2417
2418 if (checksum != data_crc) {
2419 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2420 " does not match computed 0x%08x\n", checksum,
2421 data_crc);
2422
2423 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2424 pr_err("Unable to recover from"
2425 " Immediate Data digest failure while"
2426 " in ERL=0.\n");
2427 iscsit_add_reject_from_cmd(
2428 ISCSI_REASON_DATA_DIGEST_ERROR,
3e1c81a9 2429 1, 0, (unsigned char *)hdr, cmd);
e48354ce
NB		 2430 return IMMEDIATE_DATA_CANNOT_RECOVER;
2431 } else {
2432 iscsit_add_reject_from_cmd(
2433 ISCSI_REASON_DATA_DIGEST_ERROR,
3e1c81a9 2434 0, 0, (unsigned char *)hdr, cmd);
e48354ce
NB		 2435 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2436 }
2437 } else {
2438 pr_debug("Got CRC32C DataDigest 0x%08x for"
2439 " %u bytes of Immediate Data\n", checksum,
2440 length);
2441 }
2442 }
2443
2444 cmd->write_data_done += length;
2445
ebf1d95c 2446 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2447 spin_lock_bh(&cmd->istate_lock);
2448 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2449 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2450 spin_unlock_bh(&cmd->istate_lock);
2451 }
2452
2453 return IMMEDIATE_DATA_NORMAL_OPERATION;
2454}
2455
2456/*
2457 * Called with sess->conn_lock held.
2458 */
2459/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2460 with active network interface */
2461static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2462{
2463 struct iscsi_cmd *cmd;
2464 struct iscsi_conn *conn_p;
2465
2466 /*
2467 * Only send a Asynchronous Message on connections whos network
2468 * interface is still functional.
2469 */
2470 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2471 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2472 iscsit_inc_conn_usage_count(conn_p);
2473 break;
2474 }
2475 }
2476
2477 if (!conn_p)
2478 return;
2479
3c989d76 2480 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2481 if (!cmd) {
2482 iscsit_dec_conn_usage_count(conn_p);
2483 return;
2484 }
2485
2486 cmd->logout_cid = conn->cid;
2487 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2488 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2489
2490 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2491 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2492 spin_unlock_bh(&conn_p->cmd_lock);
2493
2494 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2495 iscsit_dec_conn_usage_count(conn_p);
2496}
2497
2498static int iscsit_send_conn_drop_async_message(
2499 struct iscsi_cmd *cmd,
2500 struct iscsi_conn *conn)
2501{
2502 struct iscsi_async *hdr;
2503
2504 cmd->tx_size = ISCSI_HDR_LEN;
2505 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2506
2507 hdr = (struct iscsi_async *) cmd->pdu;
2508 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2509 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2510 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2511 cmd->targ_xfer_tag = 0xFFFFFFFF;
2512 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2513 cmd->stat_sn = conn->stat_sn++;
2514 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2515 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2516 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2517 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2518 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2519 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2520 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2521
2522 if (conn->conn_ops->HeaderDigest) {
2523 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2524
80690fdb
GU		 2525 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2526 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2527
2528 cmd->tx_size += ISCSI_CRC_LEN;
2529 pr_debug("Attaching CRC32C HeaderDigest to"
2530 " Async Message 0x%08x\n", *header_digest);
2531 }
2532
2533 cmd->iov_misc[0].iov_base = cmd->pdu;
2534 cmd->iov_misc[0].iov_len = cmd->tx_size;
2535 cmd->iov_misc_count = 1;
2536
2537 pr_debug("Sending Connection Dropped Async Message StatSN:"
2538 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2539 cmd->logout_cid, conn->cid);
2540 return 0;
2541}
2542
6f3c0e69
AG		 2543static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2544{
2545 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2546 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2547 wait_for_completion_interruptible_timeout(
2548 &conn->tx_half_close_comp,
2549 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2550 }
2551}
2552
2ec5a8c1
NB		 2553static void
2554iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2555 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2556 bool set_statsn)
e48354ce 2557{
2ec5a8c1
NB		 2558 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2559 hdr->flags = datain->flags;
2560 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2561 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2562 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2563 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2564 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2565 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2566 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2567 }
2568 }
2569 hton24(hdr->dlength, datain->length);
2570 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2571 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2572 (struct scsi_lun *)&hdr->lun);
2573 else
2574 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2575
2576 hdr->itt = cmd->init_task_tag;
2577
2578 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2579 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2580 else
2581 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2582 if (set_statsn)
2583 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2584 else
2585 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2586
2587 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2588 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2589 hdr->datasn = cpu_to_be32(datain->data_sn);
2590 hdr->offset = cpu_to_be32(datain->offset);
2591
2592 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2593 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2594 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2595 ntohl(hdr->offset), datain->length, conn->cid);
2596}
2597
2598static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2599{
2600 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2601 struct iscsi_datain datain;
2602 struct iscsi_datain_req *dr;
e48354ce 2603 struct kvec *iov;
2ec5a8c1
NB		 2604 u32 iov_count = 0, tx_size = 0;
2605 int eodr = 0, ret, iov_ret;
2606 bool set_statsn = false;
e48354ce
NB		 2607
2608 memset(&datain, 0, sizeof(struct iscsi_datain));
2609 dr = iscsit_get_datain_values(cmd, &datain);
2610 if (!dr) {
2611 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2612 cmd->init_task_tag);
2613 return -1;
2614 }
e48354ce
NB		 2615 /*
2616 * Be paranoid and double check the logic for now.
2617 */
ebf1d95c 2618 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2619 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2620 " datain.length: %u exceeds cmd->data_length: %u\n",
2621 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2622 cmd->se_cmd.data_length);
e48354ce
NB		 2623 return -1;
2624 }
2625
2626 spin_lock_bh(&conn->sess->session_stats_lock);
2627 conn->sess->tx_data_octets += datain.length;
2628 if (conn->sess->se_sess->se_node_acl) {
2629 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2630 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2631 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2632 }
2633 spin_unlock_bh(&conn->sess->session_stats_lock);
2634 /*
2635 * Special case for successfully execution w/ both DATAIN
2636 * and Sense Data.
2637 */
2638 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2639 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2640 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2641 else {
2642 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2643 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2644 iscsit_increment_maxcmdsn(cmd, conn->sess);
2645 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2646 set_statsn = true;
e48354ce 2647 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2648 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2649 set_statsn = true;
e48354ce
NB		 2650 }
2651
2ec5a8c1 2652 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2653
2654 iov = &cmd->iov_data[0];
2655 iov[iov_count].iov_base = cmd->pdu;
2656 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2657 tx_size += ISCSI_HDR_LEN;
2658
2659 if (conn->conn_ops->HeaderDigest) {
2660 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2661
80690fdb
GU		 2662 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2663 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2664
2665 iov[0].iov_len += ISCSI_CRC_LEN;
2666 tx_size += ISCSI_CRC_LEN;
2667
2668 pr_debug("Attaching CRC32 HeaderDigest"
2669 " for DataIN PDU 0x%08x\n", *header_digest);
2670 }
2671
2ec5a8c1
NB		 2672 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2673 datain.offset, datain.length);
e48354ce
NB		 2674 if (iov_ret < 0)
2675 return -1;
2676
2677 iov_count += iov_ret;
2678 tx_size += datain.length;
2679
2680 cmd->padding = ((-datain.length) & 3);
2681 if (cmd->padding) {
2682 iov[iov_count].iov_base = cmd->pad_bytes;
2683 iov[iov_count++].iov_len = cmd->padding;
2684 tx_size += cmd->padding;
2685
2686 pr_debug("Attaching %u padding bytes\n",
2687 cmd->padding);
2688 }
2689 if (conn->conn_ops->DataDigest) {
2690 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2691 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2692
2693 iov[iov_count].iov_base = &cmd->data_crc;
2694 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2695 tx_size += ISCSI_CRC_LEN;
2696
2697 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2698 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2699 }
2700
2701 cmd->iov_data_count = iov_count;
2702 cmd->tx_size = tx_size;
2703
6f3c0e69
AG		 2704 /* sendpage is preferred but can't insert markers */
2705 if (!conn->conn_ops->IFMarker)
2706 ret = iscsit_fe_sendpage_sg(cmd, conn);
2707 else
2708 ret = iscsit_send_tx_data(cmd, conn, 0);
2709
2710 iscsit_unmap_iovec(cmd);
2711
2712 if (ret < 0) {
2713 iscsit_tx_thread_wait_for_tcp(conn);
2714 return ret;
2715 }
2716
e48354ce 2717 if (dr->dr_complete) {
6f3c0e69 2718 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2719 2 : 1;
2720 iscsit_free_datain_req(cmd, dr);
2721 }
2722
6f3c0e69 2723 return eodr;
e48354ce
NB		 2724}
2725
2ec5a8c1
NB		 2726int
2727iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2728 struct iscsi_logout_rsp *hdr)
e48354ce 2729{
e48354ce
NB		 2730 struct iscsi_conn *logout_conn = NULL;
2731 struct iscsi_conn_recovery *cr = NULL;
2732 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2733 /*
2734 * The actual shutting down of Sessions and/or Connections
2735 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2736 * is done in scsi_logout_post_handler().
2737 */
2738 switch (cmd->logout_reason) {
2739 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2740 pr_debug("iSCSI session logout successful, setting"
2741 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2742 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2743 break;
2744 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2745 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2746 break;
2747 /*
2748 * For CLOSECONNECTION logout requests carrying
2749 * a matching logout CID -> local CID, the reference
2750 * for the local CID will have been incremented in
2751 * iscsi_logout_closeconnection().
2752 *
2753 * For CLOSECONNECTION logout requests carrying
2754 * a different CID than the connection it arrived
2755 * on, the connection responding to cmd->logout_cid
2756 * is stopped in iscsit_logout_post_handler_diffcid().
2757 */
2758
2759 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2760 " successful.\n", cmd->logout_cid, conn->cid);
2761 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2762 break;
2763 case ISCSI_LOGOUT_REASON_RECOVERY:
2764 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2765 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2766 break;
2767 /*
2768 * If the connection is still active from our point of view
2769 * force connection recovery to occur.
2770 */
2771 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2772 cmd->logout_cid);
ee1b1b9c 2773 if (logout_conn) {
e48354ce
NB		 2774 iscsit_connection_reinstatement_rcfr(logout_conn);
2775 iscsit_dec_conn_usage_count(logout_conn);
2776 }
2777
2778 cr = iscsit_get_inactive_connection_recovery_entry(
2779 conn->sess, cmd->logout_cid);
2780 if (!cr) {
2781 pr_err("Unable to locate CID: %hu for"
2782 " REMOVECONNFORRECOVERY Logout Request.\n",
2783 cmd->logout_cid);
2784 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2785 break;
2786 }
2787
2788 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2789
2790 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2791 " for recovery for CID: %hu on CID: %hu successful.\n",
2792 cmd->logout_cid, conn->cid);
2793 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2794 break;
2795 default:
2796 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2797 cmd->logout_reason);
2798 return -1;
2799 }
2800
e48354ce
NB		 2801 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2802 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2803 hdr->response = cmd->logout_response;
66c7db68 2804 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2805 cmd->stat_sn = conn->stat_sn++;
2806 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2807
2808 iscsit_increment_maxcmdsn(cmd, conn->sess);
2809 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2810 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2811
2ec5a8c1
NB		 2812 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2813 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2814 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2815 cmd->logout_cid, conn->cid);
2816
2817 return 0;
2818}
2819EXPORT_SYMBOL(iscsit_build_logout_rsp);
2820
2821static int
2822iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2823{
2824 struct kvec *iov;
2825 int niov = 0, tx_size, rc;
2826
2827 rc = iscsit_build_logout_rsp(cmd, conn,
2828 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2829 if (rc < 0)
2830 return rc;
2831
2832 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2833 iov = &cmd->iov_misc[0];
2834 iov[niov].iov_base = cmd->pdu;
2835 iov[niov++].iov_len = ISCSI_HDR_LEN;
2836
2837 if (conn->conn_ops->HeaderDigest) {
2838 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2839
80690fdb
GU		 2840 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2841 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2842
2843 iov[0].iov_len += ISCSI_CRC_LEN;
2844 tx_size += ISCSI_CRC_LEN;
2845 pr_debug("Attaching CRC32C HeaderDigest to"
2846 " Logout Response 0x%08x\n", *header_digest);
2847 }
2848 cmd->iov_misc_count = niov;
2849 cmd->tx_size = tx_size;
2850
e48354ce
NB		 2851 return 0;
2852}
2853
2ec5a8c1
NB		 2854void
2855iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2856 struct iscsi_nopin *hdr, bool nopout_response)
2857{
2858 hdr->opcode = ISCSI_OP_NOOP_IN;
2859 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2860 hton24(hdr->dlength, cmd->buf_ptr_size);
2861 if (nopout_response)
2862 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2863 hdr->itt = cmd->init_task_tag;
2864 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2865 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2866 conn->stat_sn;
2867 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2868
2869 if (nopout_response)
2870 iscsit_increment_maxcmdsn(cmd, conn->sess);
2871
2872 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2873 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2874
2875 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2876 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2877 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2878 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2879}
2880EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2881
e48354ce
NB		 2882/*
2883 * Unsolicited NOPIN, either requesting a response or not.
2884 */
2885static int iscsit_send_unsolicited_nopin(
2886 struct iscsi_cmd *cmd,
2887 struct iscsi_conn *conn,
2888 int want_response)
2889{
2ec5a8c1
NB		 2890 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2891 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2892
2ec5a8c1 2893 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2894
2895 if (conn->conn_ops->HeaderDigest) {
2896 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2897
80690fdb
GU		 2898 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2899 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2900
2901 tx_size += ISCSI_CRC_LEN;
2902 pr_debug("Attaching CRC32C HeaderDigest to"
2903 " NopIN 0x%08x\n", *header_digest);
2904 }
2905
2906 cmd->iov_misc[0].iov_base = cmd->pdu;
2907 cmd->iov_misc[0].iov_len = tx_size;
2908 cmd->iov_misc_count = 1;
2909 cmd->tx_size = tx_size;
2910
2911 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2912 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2913
6f3c0e69
AG		 2914 ret = iscsit_send_tx_data(cmd, conn, 1);
2915 if (ret < 0) {
2916 iscsit_tx_thread_wait_for_tcp(conn);
2917 return ret;
2918 }
2919
2920 spin_lock_bh(&cmd->istate_lock);
2921 cmd->i_state = want_response ?
2922 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2923 spin_unlock_bh(&cmd->istate_lock);
2924
e48354ce
NB		 2925 return 0;
2926}
2927
2ec5a8c1
NB		 2928static int
2929iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2930{
2ec5a8c1 2931 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2932 struct kvec *iov;
2ec5a8c1
NB		 2933 u32 padding = 0;
2934 int niov = 0, tx_size;
e48354ce 2935
2ec5a8c1 2936 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2937
2ec5a8c1 2938 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2939 iov = &cmd->iov_misc[0];
2940 iov[niov].iov_base = cmd->pdu;
2941 iov[niov++].iov_len = ISCSI_HDR_LEN;
2942
2943 if (conn->conn_ops->HeaderDigest) {
2944 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2945
80690fdb
GU		 2946 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2947 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2948
2949 iov[0].iov_len += ISCSI_CRC_LEN;
2950 tx_size += ISCSI_CRC_LEN;
2951 pr_debug("Attaching CRC32C HeaderDigest"
2952 " to NopIn 0x%08x\n", *header_digest);
2953 }
2954
2955 /*
2956 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2957 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2958 */
2959 if (cmd->buf_ptr_size) {
2960 iov[niov].iov_base = cmd->buf_ptr;
2961 iov[niov++].iov_len = cmd->buf_ptr_size;
2962 tx_size += cmd->buf_ptr_size;
2963
2964 pr_debug("Echoing back %u bytes of ping"
2965 " data.\n", cmd->buf_ptr_size);
2966
2967 padding = ((-cmd->buf_ptr_size) & 3);
2968 if (padding != 0) {
2969 iov[niov].iov_base = &cmd->pad_bytes;
2970 iov[niov++].iov_len = padding;
2971 tx_size += padding;
2972 pr_debug("Attaching %u additional"
2973 " padding bytes.\n", padding);
2974 }
2975 if (conn->conn_ops->DataDigest) {
2976 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2977 cmd->buf_ptr, cmd->buf_ptr_size,
2978 padding, (u8 *)&cmd->pad_bytes,
2979 (u8 *)&cmd->data_crc);
2980
2981 iov[niov].iov_base = &cmd->data_crc;
2982 iov[niov++].iov_len = ISCSI_CRC_LEN;
2983 tx_size += ISCSI_CRC_LEN;
2984 pr_debug("Attached DataDigest for %u"
2985 " bytes of ping data, CRC 0x%08x\n",
2986 cmd->buf_ptr_size, cmd->data_crc);
2987 }
2988 }
2989
2990 cmd->iov_misc_count = niov;
2991 cmd->tx_size = tx_size;
2992
e48354ce
NB		 2993 return 0;
2994}
2995
6f3c0e69 2996static int iscsit_send_r2t(
e48354ce
NB		 2997 struct iscsi_cmd *cmd,
2998 struct iscsi_conn *conn)
2999{
3000 int tx_size = 0;
3001 struct iscsi_r2t *r2t;
3002 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3003 int ret;
e48354ce
NB		 3004
3005 r2t = iscsit_get_r2t_from_list(cmd);
3006 if (!r2t)
3007 return -1;
3008
3009 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3010 memset(hdr, 0, ISCSI_HDR_LEN);
3011 hdr->opcode = ISCSI_OP_R2T;
3012 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3013 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3014 (struct scsi_lun *)&hdr->lun);
66c7db68 3015 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3016 spin_lock_bh(&conn->sess->ttt_lock);
3017 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3018 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3019 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3020 spin_unlock_bh(&conn->sess->ttt_lock);
3021 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3022 hdr->statsn = cpu_to_be32(conn->stat_sn);
3023 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3024 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3025 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3026 hdr->data_offset = cpu_to_be32(r2t->offset);
3027 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3028
3029 cmd->iov_misc[0].iov_base = cmd->pdu;
3030 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3031 tx_size += ISCSI_HDR_LEN;
3032
3033 if (conn->conn_ops->HeaderDigest) {
3034 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3035
80690fdb
GU		 3036 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3037 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3038
3039 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3040 tx_size += ISCSI_CRC_LEN;
3041 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3042 " PDU 0x%08x\n", *header_digest);
3043 }
3044
3045 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3046 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3047 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3048 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3049 r2t->offset, r2t->xfer_len, conn->cid);
3050
3051 cmd->iov_misc_count = 1;
3052 cmd->tx_size = tx_size;
3053
3054 spin_lock_bh(&cmd->r2t_lock);
3055 r2t->sent_r2t = 1;
3056 spin_unlock_bh(&cmd->r2t_lock);
3057
6f3c0e69
AG		 3058 ret = iscsit_send_tx_data(cmd, conn, 1);
3059 if (ret < 0) {
3060 iscsit_tx_thread_wait_for_tcp(conn);
3061 return ret;
3062 }
3063
3064 spin_lock_bh(&cmd->dataout_timeout_lock);
3065 iscsit_start_dataout_timer(cmd, conn);
3066 spin_unlock_bh(&cmd->dataout_timeout_lock);
3067
e48354ce
NB		 3068 return 0;
3069}
3070
3071/*
8b1e1244
AG		 3072 * @recovery: If called from iscsi_task_reassign_complete_write() for
3073 * connection recovery.
e48354ce
NB		 3074 */
3075int iscsit_build_r2ts_for_cmd(
e48354ce 3076 struct iscsi_conn *conn,
3e1c81a9 3077 struct iscsi_cmd *cmd,
8b1e1244 3078 bool recovery)
e48354ce
NB		 3079{
3080 int first_r2t = 1;
3081 u32 offset = 0, xfer_len = 0;
3082
3083 spin_lock_bh(&cmd->r2t_lock);
3084 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3085 spin_unlock_bh(&cmd->r2t_lock);
3086 return 0;
3087 }
3088
8b1e1244
AG		 3089 if (conn->sess->sess_ops->DataSequenceInOrder &&
3090 !recovery)
c6037cc5 3091 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3092
3093 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3094 if (conn->sess->sess_ops->DataSequenceInOrder) {
3095 offset = cmd->r2t_offset;
3096
8b1e1244
AG		 3097 if (first_r2t && recovery) {
3098 int new_data_end = offset +
3099 conn->sess->sess_ops->MaxBurstLength -
3100 cmd->next_burst_len;
3101
ebf1d95c
AG		 3102 if (new_data_end > cmd->se_cmd.data_length)
3103 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3104 else
3105 xfer_len =
3106 conn->sess->sess_ops->MaxBurstLength -
3107 cmd->next_burst_len;
e48354ce 3108 } else {
8b1e1244
AG		 3109 int new_data_end = offset +
3110 conn->sess->sess_ops->MaxBurstLength;
3111
ebf1d95c
AG		 3112 if (new_data_end > cmd->se_cmd.data_length)
3113 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3114 else
3115 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3116 }
3117 cmd->r2t_offset += xfer_len;
3118
ebf1d95c 3119 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3120 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3121 } else {
3122 struct iscsi_seq *seq;
3123
3124 seq = iscsit_get_seq_holder_for_r2t(cmd);
3125 if (!seq) {
3126 spin_unlock_bh(&cmd->r2t_lock);
3127 return -1;
3128 }
3129
3130 offset = seq->offset;
3131 xfer_len = seq->xfer_len;
3132
3133 if (cmd->seq_send_order == cmd->seq_count)
3134 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3135 }
3136 cmd->outstanding_r2ts++;
3137 first_r2t = 0;
3138
3139 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3140 spin_unlock_bh(&cmd->r2t_lock);
3141 return -1;
3142 }
3143
3144 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3145 break;
3146 }
3147 spin_unlock_bh(&cmd->r2t_lock);
3148
3149 return 0;
3150}
3151
2ec5a8c1
NB		 3152void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3153 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3154{
2ec5a8c1 3155 if (inc_stat_sn)
e48354ce
NB		 3156 cmd->stat_sn = conn->stat_sn++;
3157
3158 spin_lock_bh(&conn->sess->session_stats_lock);
3159 conn->sess->rsp_pdus++;
3160 spin_unlock_bh(&conn->sess->session_stats_lock);
3161
e48354ce
NB		 3162 memset(hdr, 0, ISCSI_HDR_LEN);
3163 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3164 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3165 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3166 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3167 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3168 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3169 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3170 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3171 }
3172 hdr->response = cmd->iscsi_response;
3173 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3174 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3175 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3176
3177 iscsit_increment_maxcmdsn(cmd, conn->sess);
3178 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3179 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3180
2ec5a8c1
NB		 3181 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3182 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3183 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3184 cmd->se_cmd.scsi_status, conn->cid);
3185}
3186EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3187
3188static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3189{
3190 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3191 struct kvec *iov;
3192 u32 padding = 0, tx_size = 0;
3193 int iov_count = 0;
3194 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3195
3196 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3197
e48354ce
NB		 3198 iov = &cmd->iov_misc[0];
3199 iov[iov_count].iov_base = cmd->pdu;
3200 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3201 tx_size += ISCSI_HDR_LEN;
3202
3203 /*
3204 * Attach SENSE DATA payload to iSCSI Response PDU
3205 */
3206 if (cmd->se_cmd.sense_buffer &&
3207 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3208 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3209 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3210 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3211
e48354ce 3212 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3213 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3214 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3215 iov[iov_count++].iov_len =
3216 (cmd->se_cmd.scsi_sense_length + padding);
3217 tx_size += cmd->se_cmd.scsi_sense_length;
3218
3219 if (padding) {
9c58b7dd 3220 memset(cmd->sense_buffer +
e48354ce
NB		 3221 cmd->se_cmd.scsi_sense_length, 0, padding);
3222 tx_size += padding;
3223 pr_debug("Adding %u bytes of padding to"
3224 " SENSE.\n", padding);
3225 }
3226
3227 if (conn->conn_ops->DataDigest) {
3228 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3229 cmd->sense_buffer,
e48354ce
NB		 3230 (cmd->se_cmd.scsi_sense_length + padding),
3231 0, NULL, (u8 *)&cmd->data_crc);
3232
3233 iov[iov_count].iov_base = &cmd->data_crc;
3234 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3235 tx_size += ISCSI_CRC_LEN;
3236
3237 pr_debug("Attaching CRC32 DataDigest for"
3238 " SENSE, %u bytes CRC 0x%08x\n",
3239 (cmd->se_cmd.scsi_sense_length + padding),
3240 cmd->data_crc);
3241 }
3242
3243 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3244 " Response PDU\n",
3245 cmd->se_cmd.scsi_sense_length);
3246 }
3247
3248 if (conn->conn_ops->HeaderDigest) {
3249 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3250
80690fdb
GU		 3251 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3252 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3253
3254 iov[0].iov_len += ISCSI_CRC_LEN;
3255 tx_size += ISCSI_CRC_LEN;
3256 pr_debug("Attaching CRC32 HeaderDigest for Response"
3257 " PDU 0x%08x\n", *header_digest);
3258 }
3259
3260 cmd->iov_misc_count = iov_count;
3261 cmd->tx_size = tx_size;
3262
e48354ce
NB		 3263 return 0;
3264}
3265
3266static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3267{
3268 switch (se_tmr->response) {
3269 case TMR_FUNCTION_COMPLETE:
3270 return ISCSI_TMF_RSP_COMPLETE;
3271 case TMR_TASK_DOES_NOT_EXIST:
3272 return ISCSI_TMF_RSP_NO_TASK;
3273 case TMR_LUN_DOES_NOT_EXIST:
3274 return ISCSI_TMF_RSP_NO_LUN;
3275 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3276 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3277 case TMR_FUNCTION_AUTHORIZATION_FAILED:
3278 return ISCSI_TMF_RSP_AUTH_FAILED;
3279 case TMR_FUNCTION_REJECTED:
3280 default:
3281 return ISCSI_TMF_RSP_REJECTED;
3282 }
3283}
3284
2ec5a8c1
NB		 3285void
3286iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3287 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3288{
3289 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3290
e48354ce 3291 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3292 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3293 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3294 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3295 cmd->stat_sn = conn->stat_sn++;
3296 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3297
3298 iscsit_increment_maxcmdsn(cmd, conn->sess);
3299 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3300 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3301
2ec5a8c1
NB		 3302 pr_debug("Built Task Management Response ITT: 0x%08x,"
3303 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3304 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3305}
3306EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3307
3308static int
3309iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3310{
3311 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3312 u32 tx_size = 0;
3313
3314 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3315
e48354ce
NB		 3316 cmd->iov_misc[0].iov_base = cmd->pdu;
3317 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3318 tx_size += ISCSI_HDR_LEN;
3319
3320 if (conn->conn_ops->HeaderDigest) {
3321 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3322
80690fdb
GU		 3323 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3324 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3325
3326 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3327 tx_size += ISCSI_CRC_LEN;
3328 pr_debug("Attaching CRC32 HeaderDigest for Task"
3329 " Mgmt Response PDU 0x%08x\n", *header_digest);
3330 }
3331
3332 cmd->iov_misc_count = 1;
3333 cmd->tx_size = tx_size;
3334
e48354ce
NB		 3335 return 0;
3336}
3337
2f9bc894
NB		 3338static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3339{
3340 bool ret = false;
3341
3342 if (np->np_sockaddr.ss_family == AF_INET6) {
3343 const struct sockaddr_in6 sin6 = {
3344 .sin6_addr = IN6ADDR_ANY_INIT };
3345 struct sockaddr_in6 *sock_in6 =
3346 (struct sockaddr_in6 *)&np->np_sockaddr;
3347
3348 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3349 sin6.sin6_addr.s6_addr, 16))
3350 ret = true;
3351 } else {
3352 struct sockaddr_in * sock_in =
3353 (struct sockaddr_in *)&np->np_sockaddr;
3354
cea0b4ce 3355 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3356 ret = true;
3357 }
3358
3359 return ret;
3360}
3361
8b1e1244
AG		 3362#define SENDTARGETS_BUF_LIMIT 32768U
3363
e48354ce
NB		 3364static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3365{
3366 char *payload = NULL;
3367 struct iscsi_conn *conn = cmd->conn;
3368 struct iscsi_portal_group *tpg;
3369 struct iscsi_tiqn *tiqn;
3370 struct iscsi_tpg_np *tpg_np;
3371 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3372 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
e48354ce 3373
8b1e1244
AG		 3374 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3375 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3376
3377 payload = kzalloc(buffer_len, GFP_KERNEL);
3378 if (!payload) {
3379 pr_err("Unable to allocate memory for sendtargets"
3380 " response.\n");
3381 return -ENOMEM;
3382 }
3383
3384 spin_lock(&tiqn_lock);
3385 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3386 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3387 len += 1;
3388
3389 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3390 end_of_buf = 1;
3391 goto eob;
3392 }
8359cf43 3393 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3394 payload_len += len;
3395
3396 spin_lock(&tiqn->tiqn_tpg_lock);
3397 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3398
3399 spin_lock(&tpg->tpg_state_lock);
3400 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3401 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3402 spin_unlock(&tpg->tpg_state_lock);
3403 continue;
3404 }
3405 spin_unlock(&tpg->tpg_state_lock);
3406
3407 spin_lock(&tpg->tpg_np_lock);
3408 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3409 tpg_np_list) {
2f9bc894
NB		 3410 struct iscsi_np *np = tpg_np->tpg_np;
3411 bool inaddr_any = iscsit_check_inaddr_any(np);
3412
e48354ce
NB		 3413 len = sprintf(buf, "TargetAddress="
3414 "%s%s%s:%hu,%hu",
2f9bc894
NB		 3415 (np->np_sockaddr.ss_family == AF_INET6) ?
3416 "[" : "", (inaddr_any == false) ?
3417 np->np_ip : conn->local_ip,
3418 (np->np_sockaddr.ss_family == AF_INET6) ?
3419 "]" : "", (inaddr_any == false) ?
3420 np->np_port : conn->local_port,
e48354ce
NB		 3421 tpg->tpgt);
3422 len += 1;
3423
3424 if ((len + payload_len) > buffer_len) {
3425 spin_unlock(&tpg->tpg_np_lock);
3426 spin_unlock(&tiqn->tiqn_tpg_lock);
3427 end_of_buf = 1;
3428 goto eob;
3429 }
8359cf43 3430 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3431 payload_len += len;
3432 }
3433 spin_unlock(&tpg->tpg_np_lock);
3434 }
3435 spin_unlock(&tiqn->tiqn_tpg_lock);
3436eob:
3437 if (end_of_buf)
3438 break;
3439 }
3440 spin_unlock(&tiqn_lock);
3441
3442 cmd->buf_ptr = payload;
3443
3444 return payload_len;
3445}
3446
3447/*
3448 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3449 * MaxRecvDataSegmentLength.
3450 */
3451static int iscsit_send_text_rsp(
3452 struct iscsi_cmd *cmd,
3453 struct iscsi_conn *conn)
3454{
3455 struct iscsi_text_rsp *hdr;
3456 struct kvec *iov;
3457 u32 padding = 0, tx_size = 0;
3458 int text_length, iov_count = 0;
3459
3460 text_length = iscsit_build_sendtargets_response(cmd);
3461 if (text_length < 0)
3462 return text_length;
3463
3464 padding = ((-text_length) & 3);
3465 if (padding != 0) {
3466 memset(cmd->buf_ptr + text_length, 0, padding);
3467 pr_debug("Attaching %u additional bytes for"
3468 " padding.\n", padding);
3469 }
3470
3471 hdr = (struct iscsi_text_rsp *) cmd->pdu;
3472 memset(hdr, 0, ISCSI_HDR_LEN);
3473 hdr->opcode = ISCSI_OP_TEXT_RSP;
3474 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3475 hton24(hdr->dlength, text_length);
66c7db68 3476 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3477 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3478 cmd->stat_sn = conn->stat_sn++;
3479 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3480
3481 iscsit_increment_maxcmdsn(cmd, conn->sess);
3482 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3483 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3484
3485 iov = &cmd->iov_misc[0];
3486
3487 iov[iov_count].iov_base = cmd->pdu;
3488 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3489 iov[iov_count].iov_base = cmd->buf_ptr;
3490 iov[iov_count++].iov_len = text_length + padding;
3491
3492 tx_size += (ISCSI_HDR_LEN + text_length + padding);
3493
3494 if (conn->conn_ops->HeaderDigest) {
3495 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3496
80690fdb
GU		 3497 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3498 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3499
3500 iov[0].iov_len += ISCSI_CRC_LEN;
3501 tx_size += ISCSI_CRC_LEN;
3502 pr_debug("Attaching CRC32 HeaderDigest for"
3503 " Text Response PDU 0x%08x\n", *header_digest);
3504 }
3505
3506 if (conn->conn_ops->DataDigest) {
3507 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3508 cmd->buf_ptr, (text_length + padding),
3509 0, NULL, (u8 *)&cmd->data_crc);
3510
3511 iov[iov_count].iov_base = &cmd->data_crc;
3512 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3513 tx_size += ISCSI_CRC_LEN;
3514
3515 pr_debug("Attaching DataDigest for %u bytes of text"
3516 " data, CRC 0x%08x\n", (text_length + padding),
3517 cmd->data_crc);
3518 }
3519
3520 cmd->iov_misc_count = iov_count;
3521 cmd->tx_size = tx_size;
3522
3523 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3524 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3525 text_length, conn->cid);
3526 return 0;
3527}
3528
2ec5a8c1
NB		 3529void
3530iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3531 struct iscsi_reject *hdr)
3532{
3533 hdr->opcode = ISCSI_OP_REJECT;
3534 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3535 hton24(hdr->dlength, ISCSI_HDR_LEN);
3536 hdr->ffffffff = cpu_to_be32(0xffffffff);
3537 cmd->stat_sn = conn->stat_sn++;
3538 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3539 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3540 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3541
3542}
3543EXPORT_SYMBOL(iscsit_build_reject);
3544
e48354ce
NB		 3545static int iscsit_send_reject(
3546 struct iscsi_cmd *cmd,
3547 struct iscsi_conn *conn)
3548{
bfbdb31d 3549 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3550 struct kvec *iov;
bfbdb31d 3551 u32 iov_count = 0, tx_size;
e48354ce 3552
bfbdb31d 3553 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3554
3555 iov = &cmd->iov_misc[0];
e48354ce
NB		 3556 iov[iov_count].iov_base = cmd->pdu;
3557 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3558 iov[iov_count].iov_base = cmd->buf_ptr;
3559 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3560
3561 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3562
3563 if (conn->conn_ops->HeaderDigest) {
3564 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3565
80690fdb
GU		 3566 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3567 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3568
3569 iov[0].iov_len += ISCSI_CRC_LEN;
3570 tx_size += ISCSI_CRC_LEN;
3571 pr_debug("Attaching CRC32 HeaderDigest for"
3572 " REJECT PDU 0x%08x\n", *header_digest);
3573 }
3574
3575 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3576 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3577 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3578
3579 iov[iov_count].iov_base = &cmd->data_crc;
3580 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3581 tx_size += ISCSI_CRC_LEN;
3582 pr_debug("Attaching CRC32 DataDigest for REJECT"
3583 " PDU 0x%08x\n", cmd->data_crc);
3584 }
3585
3586 cmd->iov_misc_count = iov_count;
3587 cmd->tx_size = tx_size;
3588
3589 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3590 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3591
3592 return 0;
3593}
3594
e48354ce
NB		 3595void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3596{
3597 struct iscsi_thread_set *ts = conn->thread_set;
3598 int ord, cpu;
3599 /*
3600 * thread_id is assigned from iscsit_global->ts_bitmap from
3601 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3602 *
3603 * Here we use thread_id to determine which CPU that this
3604 * iSCSI connection's iscsi_thread_set will be scheduled to
3605 * execute upon.
3606 */
3607 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3608 for_each_online_cpu(cpu) {
3609 if (ord-- == 0) {
3610 cpumask_set_cpu(cpu, conn->conn_cpumask);
3611 return;
3612 }
3613 }
3614 /*
3615 * This should never be reached..
3616 */
3617 dump_stack();
3618 cpumask_setall(conn->conn_cpumask);
3619}
3620
3621static inline void iscsit_thread_check_cpumask(
3622 struct iscsi_conn *conn,
3623 struct task_struct *p,
3624 int mode)
3625{
3626 char buf[128];
3627 /*
3628 * mode == 1 signals iscsi_target_tx_thread() usage.
3629 * mode == 0 signals iscsi_target_rx_thread() usage.
3630 */
3631 if (mode == 1) {
3632 if (!conn->conn_tx_reset_cpumask)
3633 return;
3634 conn->conn_tx_reset_cpumask = 0;
3635 } else {
3636 if (!conn->conn_rx_reset_cpumask)
3637 return;
3638 conn->conn_rx_reset_cpumask = 0;
3639 }
3640 /*
3641 * Update the CPU mask for this single kthread so that
3642 * both TX and RX kthreads are scheduled to run on the
3643 * same CPU.
3644 */
3645 memset(buf, 0, 128);
3646 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3647 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3648}
3649
2ec5a8c1
NB		 3650static int
3651iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3652{
6f3c0e69
AG		 3653 int ret;
3654
2ec5a8c1
NB		 3655 switch (state) {
3656 case ISTATE_SEND_R2T:
3657 ret = iscsit_send_r2t(cmd, conn);
3658 if (ret < 0)
3659 goto err;
3660 break;
3661 case ISTATE_REMOVE:
3662 spin_lock_bh(&conn->cmd_lock);
3663 list_del(&cmd->i_conn_node);
3664 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3665
aafc9d15 3666 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3667 break;
3668 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3669 iscsit_mod_nopin_response_timer(conn);
3670 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3671 if (ret < 0)
6f3c0e69 3672 goto err;
2ec5a8c1
NB		 3673 break;
3674 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3675 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3676 if (ret < 0)
3677 goto err;
3678 break;
3679 default:
3680 pr_err("Unknown Opcode: 0x%02x ITT:"
3681 " 0x%08x, i_state: %d on CID: %hu\n",
3682 cmd->iscsi_opcode, cmd->init_task_tag, state,
3683 conn->cid);
3684 goto err;
6f3c0e69
AG		 3685 }
3686
3687 return 0;
3688
3689err:
3690 return -1;
3691}
3692
2ec5a8c1
NB		 3693static int
3694iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3695{
2ec5a8c1 3696 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3697 struct iscsi_queue_req *qr;
3698 struct iscsi_cmd *cmd;
3699 u8 state;
3700 int ret;
3701
2ec5a8c1
NB		 3702 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3703 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3704 cmd = qr->cmd;
3705 state = qr->state;
3706 kmem_cache_free(lio_qr_cache, qr);
3707
2ec5a8c1
NB		 3708 ret = t->iscsit_immediate_queue(conn, cmd, state);
3709 if (ret < 0)
3710 return ret;
3711 }
fd3a9025 3712
2ec5a8c1
NB		 3713 return 0;
3714}
6f3c0e69 3715
2ec5a8c1
NB		 3716static int
3717iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3718{
3719 int ret;
3720
3721check_rsp_state:
3722 switch (state) {
3723 case ISTATE_SEND_DATAIN:
3724 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3725 if (ret < 0)
3726 goto err;
2ec5a8c1
NB		 3727 else if (!ret)
3728 /* more drs */
3729 goto check_rsp_state;
3730 else if (ret == 1) {
3731 /* all done */
3732 spin_lock_bh(&cmd->istate_lock);
3733 cmd->i_state = ISTATE_SENT_STATUS;
3734 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3735
2ec5a8c1
NB		 3736 if (atomic_read(&conn->check_immediate_queue))
3737 return 1;
6f3c0e69 3738
2ec5a8c1
NB		 3739 return 0;
3740 } else if (ret == 2) {
3741 /* Still must send status,
3742 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3743 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3744 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3745 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3746 state = ISTATE_SEND_STATUS;
3747 goto check_rsp_state;
3748 }
3749
3750 break;
3751 case ISTATE_SEND_STATUS:
3752 case ISTATE_SEND_STATUS_RECOVERY:
3753 ret = iscsit_send_response(cmd, conn);
3754 break;
3755 case ISTATE_SEND_LOGOUTRSP:
3756 ret = iscsit_send_logout(cmd, conn);
3757 break;
3758 case ISTATE_SEND_ASYNCMSG:
3759 ret = iscsit_send_conn_drop_async_message(
3760 cmd, conn);
3761 break;
3762 case ISTATE_SEND_NOPIN:
3763 ret = iscsit_send_nopin(cmd, conn);
3764 break;
3765 case ISTATE_SEND_REJECT:
3766 ret = iscsit_send_reject(cmd, conn);
3767 break;
3768 case ISTATE_SEND_TASKMGTRSP:
3769 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3770 if (ret != 0)
6f3c0e69 3771 break;
2ec5a8c1
NB		 3772 ret = iscsit_tmr_post_handler(cmd, conn);
3773 if (ret != 0)
3774 iscsit_fall_back_to_erl0(conn->sess);
3775 break;
3776 case ISTATE_SEND_TEXTRSP:
3777 ret = iscsit_send_text_rsp(cmd, conn);
3778 break;
3779 default:
3780 pr_err("Unknown Opcode: 0x%02x ITT:"
3781 " 0x%08x, i_state: %d on CID: %hu\n",
3782 cmd->iscsi_opcode, cmd->init_task_tag,
3783 state, conn->cid);
3784 goto err;
3785 }
3786 if (ret < 0)
3787 goto err;
3788
3789 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3790 iscsit_tx_thread_wait_for_tcp(conn);
3791 iscsit_unmap_iovec(cmd);
3792 goto err;
3793 }
3794 iscsit_unmap_iovec(cmd);
3795
3796 switch (state) {
3797 case ISTATE_SEND_LOGOUTRSP:
3798 if (!iscsit_logout_post_handler(cmd, conn))
3799 goto restart;
3800 /* fall through */
3801 case ISTATE_SEND_STATUS:
3802 case ISTATE_SEND_ASYNCMSG:
3803 case ISTATE_SEND_NOPIN:
3804 case ISTATE_SEND_STATUS_RECOVERY:
3805 case ISTATE_SEND_TEXTRSP:
3806 case ISTATE_SEND_TASKMGTRSP:
3807 spin_lock_bh(&cmd->istate_lock);
3808 cmd->i_state = ISTATE_SENT_STATUS;
3809 spin_unlock_bh(&cmd->istate_lock);
3810 break;
3811 case ISTATE_SEND_REJECT:
3812 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3813 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
6f3c0e69 3814 complete(&cmd->reject_comp);
6f3c0e69
AG		 3815 goto err;
3816 }
2ec5a8c1
NB		 3817 complete(&cmd->reject_comp);
3818 break;
3819 default:
3820 pr_err("Unknown Opcode: 0x%02x ITT:"
3821 " 0x%08x, i_state: %d on CID: %hu\n",
3822 cmd->iscsi_opcode, cmd->init_task_tag,
3823 cmd->i_state, conn->cid);
3824 goto err;
6f3c0e69
AG		 3825 }
3826
2ec5a8c1
NB		 3827 if (atomic_read(&conn->check_immediate_queue))
3828 return 1;
3829
6f3c0e69
AG		 3830 return 0;
3831
3832err:
3833 return -1;
3834restart:
3835 return -EAGAIN;
3836}
3837
2ec5a8c1
NB		 3838static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3839{
3840 struct iscsit_transport *t = conn->conn_transport;
3841 struct iscsi_queue_req *qr;
3842 struct iscsi_cmd *cmd;
3843 u8 state;
3844 int ret;
3845
3846 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3847 cmd = qr->cmd;
3848 state = qr->state;
3849 kmem_cache_free(lio_qr_cache, qr);
3850
3851 ret = t->iscsit_response_queue(conn, cmd, state);
3852 if (ret == 1 || ret < 0)
3853 return ret;
3854 }
3855
3856 return 0;
3857}
3858
6f3c0e69
AG		 3859int iscsi_target_tx_thread(void *arg)
3860{
e48354ce 3861 int ret = 0;
e48354ce 3862 struct iscsi_conn *conn;
8359cf43 3863 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3864 /*
3865 * Allow ourselves to be interrupted by SIGINT so that a
3866 * connection recovery / failure event can be triggered externally.
3867 */
3868 allow_signal(SIGINT);
3869
3870restart:
3871 conn = iscsi_tx_thread_pre_handler(ts);
3872 if (!conn)
3873 goto out;
3874
6f3c0e69 3875 ret = 0;
e48354ce
NB		 3876
3877 while (!kthread_should_stop()) {
3878 /*
3879 * Ensure that both TX and RX per connection kthreads
3880 * are scheduled to run on the same CPU.
3881 */
3882 iscsit_thread_check_cpumask(conn, current, 1);
3883
d5627acb
RD		 3884 wait_event_interruptible(conn->queues_wq,
3885 !iscsit_conn_all_queues_empty(conn) ||
3886 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3887
3888 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3889 signal_pending(current))
3890 goto transport_err;
3891
fd3a9025 3892get_immediate:
2ec5a8c1 3893 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3894 if (ret < 0)
3895 goto transport_err;
e48354ce 3896
2ec5a8c1 3897 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3898 if (ret == 1)
3899 goto get_immediate;
3900 else if (ret == -EAGAIN)
6f3c0e69
AG		 3901 goto restart;
3902 else if (ret < 0)
3903 goto transport_err;
e48354ce
NB		 3904 }
3905
3906transport_err:
3907 iscsit_take_action_for_connection_exit(conn);
3908 goto restart;
3909out:
3910 return 0;
3911}
3912
3e1c81a9
NB		 3913static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3914{
3915 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3916 struct iscsi_cmd *cmd;
3917 int ret = 0;
3918
3919 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3920 case ISCSI_OP_SCSI_CMD:
3921 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3922 if (!cmd)
3923 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3924 1, buf, conn);
3925
3926 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3927 break;
3928 case ISCSI_OP_SCSI_DATA_OUT:
3929 ret = iscsit_handle_data_out(conn, buf);
3930 break;
3931 case ISCSI_OP_NOOP_OUT:
3932 cmd = NULL;
3933 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3934 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3935 if (!cmd)
3936 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3937 1, buf, conn);
3938 }
3939 ret = iscsit_handle_nop_out(conn, cmd, buf);
3940 break;
3941 case ISCSI_OP_SCSI_TMFUNC:
3942 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3943 if (!cmd)
3944 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3945 1, buf, conn);
3946
3947 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3948 break;
3949 case ISCSI_OP_TEXT:
3950 ret = iscsit_handle_text_cmd(conn, buf);
3951 break;
3952 case ISCSI_OP_LOGOUT:
3953 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3954 if (!cmd)
3955 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3956 1, buf, conn);
3957
3958 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3959 if (ret > 0)
3960 wait_for_completion_timeout(&conn->conn_logout_comp,
3961 SECONDS_FOR_LOGOUT_COMP * HZ);
3962 break;
3963 case ISCSI_OP_SNACK:
3964 ret = iscsit_handle_snack(conn, buf);
3965 break;
3966 default:
3967 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3968 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3969 pr_err("Cannot recover from unknown"
3970 " opcode while ERL=0, closing iSCSI connection.\n");
3971 return -1;
3972 }
3973 if (!conn->conn_ops->OFMarker) {
3974 pr_err("Unable to recover from unknown"
3975 " opcode while OFMarker=No, closing iSCSI"
3976 " connection.\n");
3977 return -1;
3978 }
3979 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3980 pr_err("Unable to recover from unknown"
3981 " opcode, closing iSCSI connection.\n");
3982 return -1;
3983 }
3984 break;
3985 }
3986
3987 return ret;
3988}
3989
e48354ce
NB		 3990int iscsi_target_rx_thread(void *arg)
3991{
3992 int ret;
3993 u8 buffer[ISCSI_HDR_LEN], opcode;
3994 u32 checksum = 0, digest = 0;
3995 struct iscsi_conn *conn = NULL;
8359cf43 3996 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3997 struct kvec iov;
3998 /*
3999 * Allow ourselves to be interrupted by SIGINT so that a
4000 * connection recovery / failure event can be triggered externally.
4001 */
4002 allow_signal(SIGINT);
4003
4004restart:
4005 conn = iscsi_rx_thread_pre_handler(ts);
4006 if (!conn)
4007 goto out;
4008
3e1c81a9
NB		 4009 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4010 struct completion comp;
4011 int rc;
4012
4013 init_completion(&comp);
4014 rc = wait_for_completion_interruptible(&comp);
4015 if (rc < 0)
4016 goto transport_err;
4017
4018 goto out;
4019 }
4020
e48354ce
NB		 4021 while (!kthread_should_stop()) {
4022 /*
4023 * Ensure that both TX and RX per connection kthreads
4024 * are scheduled to run on the same CPU.
4025 */
4026 iscsit_thread_check_cpumask(conn, current, 0);
4027
4028 memset(buffer, 0, ISCSI_HDR_LEN);
4029 memset(&iov, 0, sizeof(struct kvec));
4030
4031 iov.iov_base = buffer;
4032 iov.iov_len = ISCSI_HDR_LEN;
4033
4034 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4035 if (ret != ISCSI_HDR_LEN) {
4036 iscsit_rx_thread_wait_for_tcp(conn);
4037 goto transport_err;
4038 }
4039
4040 /*
4041 * Set conn->bad_hdr for use with REJECT PDUs.
4042 */
4043 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4044
4045 if (conn->conn_ops->HeaderDigest) {
4046 iov.iov_base = &digest;
4047 iov.iov_len = ISCSI_CRC_LEN;
4048
4049 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4050 if (ret != ISCSI_CRC_LEN) {
4051 iscsit_rx_thread_wait_for_tcp(conn);
4052 goto transport_err;
4053 }
4054
4055 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4056 buffer, ISCSI_HDR_LEN,
4057 0, NULL, (u8 *)&checksum);
4058
4059 if (digest != checksum) {
4060 pr_err("HeaderDigest CRC32C failed,"
4061 " received 0x%08x, computed 0x%08x\n",
4062 digest, checksum);
4063 /*
4064 * Set the PDU to 0xff so it will intentionally
4065 * hit default in the switch below.
4066 */
4067 memset(buffer, 0xff, ISCSI_HDR_LEN);
4068 spin_lock_bh(&conn->sess->session_stats_lock);
4069 conn->sess->conn_digest_errors++;
4070 spin_unlock_bh(&conn->sess->session_stats_lock);
4071 } else {
4072 pr_debug("Got HeaderDigest CRC32C"
4073 " 0x%08x\n", checksum);
4074 }
4075 }
4076
4077 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4078 goto transport_err;
4079
4080 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4081
4082 if (conn->sess->sess_ops->SessionType &&
4083 ((!(opcode & ISCSI_OP_TEXT)) ||
4084 (!(opcode & ISCSI_OP_LOGOUT)))) {
4085 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4086 " while in Discovery Session, rejecting.\n", opcode);
4087 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
4088 buffer, conn);
4089 goto transport_err;
4090 }
4091
3e1c81a9
NB		 4092 ret = iscsi_target_rx_opcode(conn, buffer);
4093 if (ret < 0)
4094 goto transport_err;
e48354ce
NB		 4095 }
4096
4097transport_err:
4098 if (!signal_pending(current))
4099 atomic_set(&conn->transport_failed, 1);
4100 iscsit_take_action_for_connection_exit(conn);
4101 goto restart;
4102out:
4103 return 0;
4104}
4105
4106static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4107{
4108 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4109 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4110 /*
4111 * We expect this function to only ever be called from either RX or TX
4112 * thread context via iscsit_close_connection() once the other context
4113 * has been reset -> returned sleeping pre-handler state.
4114 */
4115 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4116 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4117
2fbb471e 4118 list_del(&cmd->i_conn_node);
e48354ce
NB		 4119 spin_unlock_bh(&conn->cmd_lock);
4120
4121 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4122
aafc9d15 4123 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4124
4125 spin_lock_bh(&conn->cmd_lock);
4126 }
4127 spin_unlock_bh(&conn->cmd_lock);
4128}
4129
4130static void iscsit_stop_timers_for_cmds(
4131 struct iscsi_conn *conn)
4132{
4133 struct iscsi_cmd *cmd;
4134
4135 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4136 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4137 if (cmd->data_direction == DMA_TO_DEVICE)
4138 iscsit_stop_dataout_timer(cmd);
4139 }
4140 spin_unlock_bh(&conn->cmd_lock);
4141}
4142
4143int iscsit_close_connection(
4144 struct iscsi_conn *conn)
4145{
4146 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4147 struct iscsi_session *sess = conn->sess;
4148
4149 pr_debug("Closing iSCSI connection CID %hu on SID:"
4150 " %u\n", conn->cid, sess->sid);
4151 /*
4152 * Always up conn_logout_comp just in case the RX Thread is sleeping
4153 * and the logout response never got sent because the connection
4154 * failed.
4155 */
4156 complete(&conn->conn_logout_comp);
4157
4158 iscsi_release_thread_set(conn);
4159
4160 iscsit_stop_timers_for_cmds(conn);
4161 iscsit_stop_nopin_response_timer(conn);
4162 iscsit_stop_nopin_timer(conn);
4163 iscsit_free_queue_reqs_for_conn(conn);
4164
4165 /*
4166 * During Connection recovery drop unacknowledged out of order
4167 * commands for this connection, and prepare the other commands
4168 * for realligence.
4169 *
4170 * During normal operation clear the out of order commands (but
4171 * do not free the struct iscsi_ooo_cmdsn's) and release all
4172 * struct iscsi_cmds.
4173 */
4174 if (atomic_read(&conn->connection_recovery)) {
4175 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4176 iscsit_prepare_cmds_for_realligance(conn);
4177 } else {
4178 iscsit_clear_ooo_cmdsns_for_conn(conn);
4179 iscsit_release_commands_from_conn(conn);
4180 }
4181
4182 /*
4183 * Handle decrementing session or connection usage count if
4184 * a logout response was not able to be sent because the
4185 * connection failed. Fall back to Session Recovery here.
4186 */
4187 if (atomic_read(&conn->conn_logout_remove)) {
4188 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4189 iscsit_dec_conn_usage_count(conn);
4190 iscsit_dec_session_usage_count(sess);
4191 }
4192 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4193 iscsit_dec_conn_usage_count(conn);
4194
4195 atomic_set(&conn->conn_logout_remove, 0);
4196 atomic_set(&sess->session_reinstatement, 0);
4197 atomic_set(&sess->session_fall_back_to_erl0, 1);
4198 }
4199
4200 spin_lock_bh(&sess->conn_lock);
4201 list_del(&conn->conn_list);
4202
4203 /*
4204 * Attempt to let the Initiator know this connection failed by
4205 * sending an Connection Dropped Async Message on another
4206 * active connection.
4207 */
4208 if (atomic_read(&conn->connection_recovery))
4209 iscsit_build_conn_drop_async_message(conn);
4210
4211 spin_unlock_bh(&sess->conn_lock);
4212
4213 /*
4214 * If connection reinstatement is being performed on this connection,
4215 * up the connection reinstatement semaphore that is being blocked on
4216 * in iscsit_cause_connection_reinstatement().
4217 */
4218 spin_lock_bh(&conn->state_lock);
4219 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4220 spin_unlock_bh(&conn->state_lock);
4221 complete(&conn->conn_wait_comp);
4222 wait_for_completion(&conn->conn_post_wait_comp);
4223 spin_lock_bh(&conn->state_lock);
4224 }
4225
4226 /*
4227 * If connection reinstatement is being performed on this connection
4228 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4229 * connection wait rcfr semaphore that is being blocked on
4230 * an iscsit_connection_reinstatement_rcfr().
4231 */
4232 if (atomic_read(&conn->connection_wait_rcfr)) {
4233 spin_unlock_bh(&conn->state_lock);
4234 complete(&conn->conn_wait_rcfr_comp);
4235 wait_for_completion(&conn->conn_post_wait_comp);
4236 spin_lock_bh(&conn->state_lock);
4237 }
4238 atomic_set(&conn->connection_reinstatement, 1);
4239 spin_unlock_bh(&conn->state_lock);
4240
4241 /*
4242 * If any other processes are accessing this connection pointer we
4243 * must wait until they have completed.
4244 */
4245 iscsit_check_conn_usage_count(conn);
4246
4247 if (conn->conn_rx_hash.tfm)
4248 crypto_free_hash(conn->conn_rx_hash.tfm);
4249 if (conn->conn_tx_hash.tfm)
4250 crypto_free_hash(conn->conn_tx_hash.tfm);
4251
4252 if (conn->conn_cpumask)
4253 free_cpumask_var(conn->conn_cpumask);
4254
4255 kfree(conn->conn_ops);
4256 conn->conn_ops = NULL;
4257
bf6932f4 4258 if (conn->sock)
e48354ce 4259 sock_release(conn->sock);
baa4d64b
NB		 4260
4261 if (conn->conn_transport->iscsit_free_conn)
4262 conn->conn_transport->iscsit_free_conn(conn);
4263
4264 iscsit_put_transport(conn->conn_transport);
4265
e48354ce
NB		 4266 conn->thread_set = NULL;
4267
4268 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4269 conn->conn_state = TARG_CONN_STATE_FREE;
4270 kfree(conn);
4271
4272 spin_lock_bh(&sess->conn_lock);
4273 atomic_dec(&sess->nconn);
4274 pr_debug("Decremented iSCSI connection count to %hu from node:"
4275 " %s\n", atomic_read(&sess->nconn),
4276 sess->sess_ops->InitiatorName);
4277 /*
4278 * Make sure that if one connection fails in an non ERL=2 iSCSI
4279 * Session that they all fail.
4280 */
4281 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4282 !atomic_read(&sess->session_logout))
4283 atomic_set(&sess->session_fall_back_to_erl0, 1);
4284
4285 /*
4286 * If this was not the last connection in the session, and we are
4287 * performing session reinstatement or falling back to ERL=0, call
4288 * iscsit_stop_session() without sleeping to shutdown the other
4289 * active connections.
4290 */
4291 if (atomic_read(&sess->nconn)) {
4292 if (!atomic_read(&sess->session_reinstatement) &&
4293 !atomic_read(&sess->session_fall_back_to_erl0)) {
4294 spin_unlock_bh(&sess->conn_lock);
4295 return 0;
4296 }
4297 if (!atomic_read(&sess->session_stop_active)) {
4298 atomic_set(&sess->session_stop_active, 1);
4299 spin_unlock_bh(&sess->conn_lock);
4300 iscsit_stop_session(sess, 0, 0);
4301 return 0;
4302 }
4303 spin_unlock_bh(&sess->conn_lock);
4304 return 0;
4305 }
4306
4307 /*
4308 * If this was the last connection in the session and one of the
4309 * following is occurring:
4310 *
4311 * Session Reinstatement is not being performed, and are falling back
4312 * to ERL=0 call iscsit_close_session().
4313 *
4314 * Session Logout was requested. iscsit_close_session() will be called
4315 * elsewhere.
4316 *
4317 * Session Continuation is not being performed, start the Time2Retain
4318 * handler and check if sleep_on_sess_wait_sem is active.
4319 */
4320 if (!atomic_read(&sess->session_reinstatement) &&
4321 atomic_read(&sess->session_fall_back_to_erl0)) {
4322 spin_unlock_bh(&sess->conn_lock);
99367f01 4323 target_put_session(sess->se_sess);
e48354ce
NB		 4324
4325 return 0;
4326 } else if (atomic_read(&sess->session_logout)) {
4327 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4328 sess->session_state = TARG_SESS_STATE_FREE;
4329 spin_unlock_bh(&sess->conn_lock);
4330
4331 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4332 complete(&sess->session_wait_comp);
4333
4334 return 0;
4335 } else {
4336 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4337 sess->session_state = TARG_SESS_STATE_FAILED;
4338
4339 if (!atomic_read(&sess->session_continuation)) {
4340 spin_unlock_bh(&sess->conn_lock);
4341 iscsit_start_time2retain_handler(sess);
4342 } else
4343 spin_unlock_bh(&sess->conn_lock);
4344
4345 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4346 complete(&sess->session_wait_comp);
4347
4348 return 0;
4349 }
4350 spin_unlock_bh(&sess->conn_lock);
4351
4352 return 0;
4353}
4354
4355int iscsit_close_session(struct iscsi_session *sess)
4356{
4357 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4358 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4359
4360 if (atomic_read(&sess->nconn)) {
4361 pr_err("%d connection(s) still exist for iSCSI session"
4362 " to %s\n", atomic_read(&sess->nconn),
4363 sess->sess_ops->InitiatorName);
4364 BUG();
4365 }
4366
4367 spin_lock_bh(&se_tpg->session_lock);
4368 atomic_set(&sess->session_logout, 1);
4369 atomic_set(&sess->session_reinstatement, 1);
4370 iscsit_stop_time2retain_timer(sess);
4371 spin_unlock_bh(&se_tpg->session_lock);
4372
4373 /*
4374 * transport_deregister_session_configfs() will clear the
4375 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4376 * can be setting it again with __transport_register_session() in
4377 * iscsi_post_login_handler() again after the iscsit_stop_session()
4378 * completes in iscsi_np context.
4379 */
4380 transport_deregister_session_configfs(sess->se_sess);
4381
4382 /*
4383 * If any other processes are accessing this session pointer we must
4384 * wait until they have completed. If we are in an interrupt (the
4385 * time2retain handler) and contain and active session usage count we
4386 * restart the timer and exit.
4387 */
4388 if (!in_interrupt()) {
4389 if (iscsit_check_session_usage_count(sess) == 1)
4390 iscsit_stop_session(sess, 1, 1);
4391 } else {
4392 if (iscsit_check_session_usage_count(sess) == 2) {
4393 atomic_set(&sess->session_logout, 0);
4394 iscsit_start_time2retain_handler(sess);
4395 return 0;
4396 }
4397 }
4398
4399 transport_deregister_session(sess->se_sess);
4400
4401 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4402 iscsit_free_connection_recovery_entires(sess);
4403
4404 iscsit_free_all_ooo_cmdsns(sess);
4405
4406 spin_lock_bh(&se_tpg->session_lock);
4407 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4408 sess->session_state = TARG_SESS_STATE_FREE;
4409 pr_debug("Released iSCSI session from node: %s\n",
4410 sess->sess_ops->InitiatorName);
4411 tpg->nsessions--;
4412 if (tpg->tpg_tiqn)
4413 tpg->tpg_tiqn->tiqn_nsessions--;
4414
4415 pr_debug("Decremented number of active iSCSI Sessions on"
4416 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4417
4418 spin_lock(&sess_idr_lock);
4419 idr_remove(&sess_idr, sess->session_index);
4420 spin_unlock(&sess_idr_lock);
4421
4422 kfree(sess->sess_ops);
4423 sess->sess_ops = NULL;
4424 spin_unlock_bh(&se_tpg->session_lock);
4425
4426 kfree(sess);
4427 return 0;
4428}
4429
4430static void iscsit_logout_post_handler_closesession(
4431 struct iscsi_conn *conn)
4432{
4433 struct iscsi_session *sess = conn->sess;
4434
4435 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4436 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4437
4438 atomic_set(&conn->conn_logout_remove, 0);
4439 complete(&conn->conn_logout_comp);
4440
4441 iscsit_dec_conn_usage_count(conn);
4442 iscsit_stop_session(sess, 1, 1);
4443 iscsit_dec_session_usage_count(sess);
99367f01 4444 target_put_session(sess->se_sess);
e48354ce
NB		 4445}
4446
4447static void iscsit_logout_post_handler_samecid(
4448 struct iscsi_conn *conn)
4449{
4450 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4451 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4452
4453 atomic_set(&conn->conn_logout_remove, 0);
4454 complete(&conn->conn_logout_comp);
4455
4456 iscsit_cause_connection_reinstatement(conn, 1);
4457 iscsit_dec_conn_usage_count(conn);
4458}
4459
4460static void iscsit_logout_post_handler_diffcid(
4461 struct iscsi_conn *conn,
4462 u16 cid)
4463{
4464 struct iscsi_conn *l_conn;
4465 struct iscsi_session *sess = conn->sess;
4466
4467 if (!sess)
4468 return;
4469
4470 spin_lock_bh(&sess->conn_lock);
4471 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4472 if (l_conn->cid == cid) {
4473 iscsit_inc_conn_usage_count(l_conn);
4474 break;
4475 }
4476 }
4477 spin_unlock_bh(&sess->conn_lock);
4478
4479 if (!l_conn)
4480 return;
4481
4482 if (l_conn->sock)
4483 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4484
4485 spin_lock_bh(&l_conn->state_lock);
4486 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4487 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4488 spin_unlock_bh(&l_conn->state_lock);
4489
4490 iscsit_cause_connection_reinstatement(l_conn, 1);
4491 iscsit_dec_conn_usage_count(l_conn);
4492}
4493
4494/*
4495 * Return of 0 causes the TX thread to restart.
4496 */
2ec5a8c1 4497int iscsit_logout_post_handler(
e48354ce
NB		 4498 struct iscsi_cmd *cmd,
4499 struct iscsi_conn *conn)
4500{
4501 int ret = 0;
4502
4503 switch (cmd->logout_reason) {
4504 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4505 switch (cmd->logout_response) {
4506 case ISCSI_LOGOUT_SUCCESS:
4507 case ISCSI_LOGOUT_CLEANUP_FAILED:
4508 default:
4509 iscsit_logout_post_handler_closesession(conn);
4510 break;
4511 }
4512 ret = 0;
4513 break;
4514 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4515 if (conn->cid == cmd->logout_cid) {
4516 switch (cmd->logout_response) {
4517 case ISCSI_LOGOUT_SUCCESS:
4518 case ISCSI_LOGOUT_CLEANUP_FAILED:
4519 default:
4520 iscsit_logout_post_handler_samecid(conn);
4521 break;
4522 }
4523 ret = 0;
4524 } else {
4525 switch (cmd->logout_response) {
4526 case ISCSI_LOGOUT_SUCCESS:
4527 iscsit_logout_post_handler_diffcid(conn,
4528 cmd->logout_cid);
4529 break;
4530 case ISCSI_LOGOUT_CID_NOT_FOUND:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED:
4532 default:
4533 break;
4534 }
4535 ret = 1;
4536 }
4537 break;
4538 case ISCSI_LOGOUT_REASON_RECOVERY:
4539 switch (cmd->logout_response) {
4540 case ISCSI_LOGOUT_SUCCESS:
4541 case ISCSI_LOGOUT_CID_NOT_FOUND:
4542 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4543 case ISCSI_LOGOUT_CLEANUP_FAILED:
4544 default:
4545 break;
4546 }
4547 ret = 1;
4548 break;
4549 default:
4550 break;
4551
4552 }
4553 return ret;
4554}
2ec5a8c1 4555EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4556
4557void iscsit_fail_session(struct iscsi_session *sess)
4558{
4559 struct iscsi_conn *conn;
4560
4561 spin_lock_bh(&sess->conn_lock);
4562 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4563 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4564 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4565 }
4566 spin_unlock_bh(&sess->conn_lock);
4567
4568 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4569 sess->session_state = TARG_SESS_STATE_FAILED;
4570}
4571
4572int iscsit_free_session(struct iscsi_session *sess)
4573{
4574 u16 conn_count = atomic_read(&sess->nconn);
4575 struct iscsi_conn *conn, *conn_tmp = NULL;
4576 int is_last;
4577
4578 spin_lock_bh(&sess->conn_lock);
4579 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4580
4581 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4582 conn_list) {
4583 if (conn_count == 0)
4584 break;
4585
4586 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4587 is_last = 1;
4588 } else {
4589 iscsit_inc_conn_usage_count(conn_tmp);
4590 is_last = 0;
4591 }
4592 iscsit_inc_conn_usage_count(conn);
4593
4594 spin_unlock_bh(&sess->conn_lock);
4595 iscsit_cause_connection_reinstatement(conn, 1);
4596 spin_lock_bh(&sess->conn_lock);
4597
4598 iscsit_dec_conn_usage_count(conn);
4599 if (is_last == 0)
4600 iscsit_dec_conn_usage_count(conn_tmp);
4601
4602 conn_count--;
4603 }
4604
4605 if (atomic_read(&sess->nconn)) {
4606 spin_unlock_bh(&sess->conn_lock);
4607 wait_for_completion(&sess->session_wait_comp);
4608 } else
4609 spin_unlock_bh(&sess->conn_lock);
4610
99367f01 4611 target_put_session(sess->se_sess);
e48354ce
NB		 4612 return 0;
4613}
4614
4615void iscsit_stop_session(
4616 struct iscsi_session *sess,
4617 int session_sleep,
4618 int connection_sleep)
4619{
4620 u16 conn_count = atomic_read(&sess->nconn);
4621 struct iscsi_conn *conn, *conn_tmp = NULL;
4622 int is_last;
4623
4624 spin_lock_bh(&sess->conn_lock);
4625 if (session_sleep)
4626 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4627
4628 if (connection_sleep) {
4629 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4630 conn_list) {
4631 if (conn_count == 0)
4632 break;
4633
4634 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635 is_last = 1;
4636 } else {
4637 iscsit_inc_conn_usage_count(conn_tmp);
4638 is_last = 0;
4639 }
4640 iscsit_inc_conn_usage_count(conn);
4641
4642 spin_unlock_bh(&sess->conn_lock);
4643 iscsit_cause_connection_reinstatement(conn, 1);
4644 spin_lock_bh(&sess->conn_lock);
4645
4646 iscsit_dec_conn_usage_count(conn);
4647 if (is_last == 0)
4648 iscsit_dec_conn_usage_count(conn_tmp);
4649 conn_count--;
4650 }
4651 } else {
4652 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4653 iscsit_cause_connection_reinstatement(conn, 0);
4654 }
4655
4656 if (session_sleep && atomic_read(&sess->nconn)) {
4657 spin_unlock_bh(&sess->conn_lock);
4658 wait_for_completion(&sess->session_wait_comp);
4659 } else
4660 spin_unlock_bh(&sess->conn_lock);
4661}
4662
4663int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4664{
4665 struct iscsi_session *sess;
4666 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4667 struct se_session *se_sess, *se_sess_tmp;
4668 int session_count = 0;
4669
4670 spin_lock_bh(&se_tpg->session_lock);
4671 if (tpg->nsessions && !force) {
4672 spin_unlock_bh(&se_tpg->session_lock);
4673 return -1;
4674 }
4675
4676 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4677 sess_list) {
4678 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4679
4680 spin_lock(&sess->conn_lock);
4681 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4682 atomic_read(&sess->session_logout) ||
4683 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4684 spin_unlock(&sess->conn_lock);
4685 continue;
4686 }
4687 atomic_set(&sess->session_reinstatement, 1);
4688 spin_unlock(&sess->conn_lock);
4689 spin_unlock_bh(&se_tpg->session_lock);
4690
4691 iscsit_free_session(sess);
4692 spin_lock_bh(&se_tpg->session_lock);
4693
4694 session_count++;
4695 }
4696 spin_unlock_bh(&se_tpg->session_lock);
4697
4698 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4699 " Group: %hu\n", session_count, tpg->tpgt);
4700 return 0;
4701}
4702
4703MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4704MODULE_VERSION("4.1.x");
4705MODULE_AUTHOR("nab@Linux-iSCSI.org");
4706MODULE_LICENSE("GPL");
4707
4708module_init(iscsi_target_init_module);
4709module_exit(iscsi_target_cleanup_module);