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iscsi-target: Only perform wait_for_tasks when performing shutdown
[mirror_ubuntu-bionic-kernel.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 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19#include <linux/string.h>
20#include <linux/kthread.h>
21#include <linux/crypto.h>
22#include <linux/completion.h>
827509e3 23#include <linux/module.h>
40401530 24#include <linux/idr.h>
e48354ce
NB		 25#include <asm/unaligned.h>
26#include <scsi/scsi_device.h>
27#include <scsi/iscsi_proto.h>
d28b1169 28#include <scsi/scsi_tcq.h>
e48354ce 29#include <target/target_core_base.h>
c4795fb2 30#include <target/target_core_fabric.h>
d28b1169 31#include <target/target_core_configfs.h>
e48354ce
NB		 32
33#include "iscsi_target_core.h"
34#include "iscsi_target_parameters.h"
35#include "iscsi_target_seq_pdu_list.h"
36#include "iscsi_target_tq.h"
37#include "iscsi_target_configfs.h"
38#include "iscsi_target_datain_values.h"
39#include "iscsi_target_erl0.h"
40#include "iscsi_target_erl1.h"
41#include "iscsi_target_erl2.h"
42#include "iscsi_target_login.h"
43#include "iscsi_target_tmr.h"
44#include "iscsi_target_tpg.h"
45#include "iscsi_target_util.h"
46#include "iscsi_target.h"
47#include "iscsi_target_device.h"
48#include "iscsi_target_stat.h"
49
baa4d64b
NB		 50#include <target/iscsi/iscsi_transport.h>
51
e48354ce
NB		 52static LIST_HEAD(g_tiqn_list);
53static LIST_HEAD(g_np_list);
54static DEFINE_SPINLOCK(tiqn_lock);
55static DEFINE_SPINLOCK(np_lock);
56
57static struct idr tiqn_idr;
58struct idr sess_idr;
59struct mutex auth_id_lock;
60spinlock_t sess_idr_lock;
61
62struct iscsit_global *iscsit_global;
63
e48354ce
NB		 64struct kmem_cache *lio_qr_cache;
65struct kmem_cache *lio_dr_cache;
66struct kmem_cache *lio_ooo_cache;
67struct kmem_cache *lio_r2t_cache;
68
69static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 70 struct iscsi_scsi_req *, u32);
e48354ce
NB		 71
72struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
73{
74 struct iscsi_tiqn *tiqn = NULL;
75
76 spin_lock(&tiqn_lock);
77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
78 if (!strcmp(tiqn->tiqn, buf)) {
79
80 spin_lock(&tiqn->tiqn_state_lock);
81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
82 tiqn->tiqn_access_count++;
83 spin_unlock(&tiqn->tiqn_state_lock);
84 spin_unlock(&tiqn_lock);
85 return tiqn;
86 }
87 spin_unlock(&tiqn->tiqn_state_lock);
88 }
89 }
90 spin_unlock(&tiqn_lock);
91
92 return NULL;
93}
94
95static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
96{
97 spin_lock(&tiqn->tiqn_state_lock);
98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
100 spin_unlock(&tiqn->tiqn_state_lock);
101 return 0;
102 }
103 spin_unlock(&tiqn->tiqn_state_lock);
104
105 return -1;
106}
107
108void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
109{
110 spin_lock(&tiqn->tiqn_state_lock);
111 tiqn->tiqn_access_count--;
112 spin_unlock(&tiqn->tiqn_state_lock);
113}
114
115/*
116 * Note that IQN formatting is expected to be done in userspace, and
117 * no explict IQN format checks are done here.
118 */
119struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
120{
121 struct iscsi_tiqn *tiqn = NULL;
122 int ret;
123
8f50c7f5 124 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 125 pr_err("Target IQN exceeds %d bytes\n",
126 ISCSI_IQN_LEN);
127 return ERR_PTR(-EINVAL);
128 }
129
130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
131 if (!tiqn) {
132 pr_err("Unable to allocate struct iscsi_tiqn\n");
133 return ERR_PTR(-ENOMEM);
134 }
135
136 sprintf(tiqn->tiqn, "%s", buf);
137 INIT_LIST_HEAD(&tiqn->tiqn_list);
138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
139 spin_lock_init(&tiqn->tiqn_state_lock);
140 spin_lock_init(&tiqn->tiqn_tpg_lock);
141 spin_lock_init(&tiqn->sess_err_stats.lock);
142 spin_lock_init(&tiqn->login_stats.lock);
143 spin_lock_init(&tiqn->logout_stats.lock);
144
e48354ce
NB		 145 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
146
c9365bd0 147 idr_preload(GFP_KERNEL);
e48354ce 148 spin_lock(&tiqn_lock);
c9365bd0
TH		 149
150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 151 if (ret < 0) {
c9365bd0 152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 153 spin_unlock(&tiqn_lock);
c9365bd0 154 idr_preload_end();
e48354ce
NB		 155 kfree(tiqn);
156 return ERR_PTR(ret);
157 }
c9365bd0 158 tiqn->tiqn_index = ret;
e48354ce 159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 160
e48354ce 161 spin_unlock(&tiqn_lock);
c9365bd0 162 idr_preload_end();
e48354ce
NB		 163
164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
165
166 return tiqn;
167
168}
169
170static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
171{
172 /*
173 * Wait for accesses to said struct iscsi_tiqn to end.
174 */
175 spin_lock(&tiqn->tiqn_state_lock);
176 while (tiqn->tiqn_access_count != 0) {
177 spin_unlock(&tiqn->tiqn_state_lock);
178 msleep(10);
179 spin_lock(&tiqn->tiqn_state_lock);
180 }
181 spin_unlock(&tiqn->tiqn_state_lock);
182}
183
184void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
185{
186 /*
187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
188 * while holding tiqn->tiqn_state_lock. This means that all subsequent
189 * attempts to access this struct iscsi_tiqn will fail from both transport
190 * fabric and control code paths.
191 */
192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
193 pr_err("iscsit_set_tiqn_shutdown() failed\n");
194 return;
195 }
196
197 iscsit_wait_for_tiqn(tiqn);
198
199 spin_lock(&tiqn_lock);
200 list_del(&tiqn->tiqn_list);
201 idr_remove(&tiqn_idr, tiqn->tiqn_index);
202 spin_unlock(&tiqn_lock);
203
204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
205 tiqn->tiqn);
206 kfree(tiqn);
207}
208
209int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
210{
211 int ret;
212 /*
213 * Determine if the network portal is accepting storage traffic.
214 */
215 spin_lock_bh(&np->np_thread_lock);
216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
217 spin_unlock_bh(&np->np_thread_lock);
218 return -1;
219 }
e48354ce
NB		 220 spin_unlock_bh(&np->np_thread_lock);
221 /*
222 * Determine if the portal group is accepting storage traffic.
223 */
224 spin_lock_bh(&tpg->tpg_state_lock);
225 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
226 spin_unlock_bh(&tpg->tpg_state_lock);
227 return -1;
228 }
229 spin_unlock_bh(&tpg->tpg_state_lock);
230
231 /*
232 * Here we serialize access across the TIQN+TPG Tuple.
233 */
a91eb7d9 234 ret = down_interruptible(&tpg->np_login_sem);
e48354ce
NB		 235 if ((ret != 0) || signal_pending(current))
236 return -1;
237
a91eb7d9
NB		 238 spin_lock_bh(&tpg->tpg_state_lock);
239 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
240 spin_unlock_bh(&tpg->tpg_state_lock);
241 up(&tpg->np_login_sem);
242 return -1;
243 }
244 spin_unlock_bh(&tpg->tpg_state_lock);
e48354ce
NB		 245
246 return 0;
247}
248
a91eb7d9
NB		 249void iscsit_login_kref_put(struct kref *kref)
250{
251 struct iscsi_tpg_np *tpg_np = container_of(kref,
252 struct iscsi_tpg_np, tpg_np_kref);
253
254 complete(&tpg_np->tpg_np_comp);
255}
256
257int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
258 struct iscsi_tpg_np *tpg_np)
e48354ce
NB		 259{
260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
261
a91eb7d9 262 up(&tpg->np_login_sem);
e48354ce 263
a91eb7d9
NB		 264 if (tpg_np)
265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
e48354ce
NB		 266
267 if (tiqn)
268 iscsit_put_tiqn_for_login(tiqn);
269
270 return 0;
271}
272
05b96892 273bool iscsit_check_np_match(
e48354ce 274 struct __kernel_sockaddr_storage *sockaddr,
05b96892 275 struct iscsi_np *np,
e48354ce
NB		 276 int network_transport)
277{
278 struct sockaddr_in *sock_in, *sock_in_e;
279 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 280 bool ip_match = false;
e48354ce
NB		 281 u16 port;
282
05b96892
NB		 283 if (sockaddr->ss_family == AF_INET6) {
284 sock_in6 = (struct sockaddr_in6 *)sockaddr;
285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
286
287 if (!memcmp(&sock_in6->sin6_addr.in6_u,
288 &sock_in6_e->sin6_addr.in6_u,
289 sizeof(struct in6_addr)))
290 ip_match = true;
291
292 port = ntohs(sock_in6->sin6_port);
293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
301 }
302
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308}
309
310static struct iscsi_np *iscsit_get_np(
311 struct __kernel_sockaddr_storage *sockaddr,
312 int network_transport)
313{
314 struct iscsi_np *np;
315 bool match;
316
e48354ce
NB		 317 spin_lock_bh(&np_lock);
318 list_for_each_entry(np, &g_np_list, np_list) {
319 spin_lock(&np->np_thread_lock);
320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
321 spin_unlock(&np->np_thread_lock);
322 continue;
323 }
324
05b96892
NB		 325 match = iscsit_check_np_match(sockaddr, np, network_transport);
326 if (match == true) {
e48354ce
NB		 327 /*
328 * Increment the np_exports reference count now to
329 * prevent iscsit_del_np() below from being called
330 * while iscsi_tpg_add_network_portal() is called.
331 */
332 np->np_exports++;
333 spin_unlock(&np->np_thread_lock);
334 spin_unlock_bh(&np_lock);
335 return np;
336 }
337 spin_unlock(&np->np_thread_lock);
338 }
339 spin_unlock_bh(&np_lock);
340
341 return NULL;
342}
343
344struct iscsi_np *iscsit_add_np(
345 struct __kernel_sockaddr_storage *sockaddr,
346 char *ip_str,
347 int network_transport)
348{
349 struct sockaddr_in *sock_in;
350 struct sockaddr_in6 *sock_in6;
351 struct iscsi_np *np;
352 int ret;
353 /*
354 * Locate the existing struct iscsi_np if already active..
355 */
356 np = iscsit_get_np(sockaddr, network_transport);
357 if (np)
358 return np;
359
360 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
361 if (!np) {
362 pr_err("Unable to allocate memory for struct iscsi_np\n");
363 return ERR_PTR(-ENOMEM);
364 }
365
366 np->np_flags |= NPF_IP_NETWORK;
367 if (sockaddr->ss_family == AF_INET6) {
368 sock_in6 = (struct sockaddr_in6 *)sockaddr;
369 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
370 np->np_port = ntohs(sock_in6->sin6_port);
371 } else {
372 sock_in = (struct sockaddr_in *)sockaddr;
373 sprintf(np->np_ip, "%s", ip_str);
374 np->np_port = ntohs(sock_in->sin_port);
375 }
376
377 np->np_network_transport = network_transport;
378 spin_lock_init(&np->np_thread_lock);
379 init_completion(&np->np_restart_comp);
380 INIT_LIST_HEAD(&np->np_list);
381
382 ret = iscsi_target_setup_login_socket(np, sockaddr);
383 if (ret != 0) {
384 kfree(np);
385 return ERR_PTR(ret);
386 }
387
388 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
389 if (IS_ERR(np->np_thread)) {
390 pr_err("Unable to create kthread: iscsi_np\n");
391 ret = PTR_ERR(np->np_thread);
392 kfree(np);
393 return ERR_PTR(ret);
394 }
395 /*
396 * Increment the np_exports reference count now to prevent
397 * iscsit_del_np() below from being run while a new call to
398 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
399 * active. We don't need to hold np->np_thread_lock at this
400 * point because iscsi_np has not been added to g_np_list yet.
401 */
402 np->np_exports = 1;
403
404 spin_lock_bh(&np_lock);
405 list_add_tail(&np->np_list, &g_np_list);
406 spin_unlock_bh(&np_lock);
407
408 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 409 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 410
411 return np;
412}
413
414int iscsit_reset_np_thread(
415 struct iscsi_np *np,
416 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 417 struct iscsi_portal_group *tpg,
418 bool shutdown)
e48354ce
NB		 419{
420 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 421 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
422 spin_unlock_bh(&np->np_thread_lock);
423 return 0;
424 }
425 np->np_thread_state = ISCSI_NP_THREAD_RESET;
426
427 if (np->np_thread) {
428 spin_unlock_bh(&np->np_thread_lock);
429 send_sig(SIGINT, np->np_thread, 1);
430 wait_for_completion(&np->np_restart_comp);
431 spin_lock_bh(&np->np_thread_lock);
432 }
433 spin_unlock_bh(&np->np_thread_lock);
434
a91eb7d9
NB		 435 if (tpg_np && shutdown) {
436 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
437
438 wait_for_completion(&tpg_np->tpg_np_comp);
439 }
440
e48354ce
NB		 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,
500 .iscsit_get_login_rx = iscsit_get_login_rx,
501 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 502 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 503 .iscsit_immediate_queue = iscsit_immediate_queue,
504 .iscsit_response_queue = iscsit_response_queue,
505 .iscsit_queue_data_in = iscsit_queue_rsp,
506 .iscsit_queue_status = iscsit_queue_rsp,
baa4d64b
NB		 507};
508
e48354ce
NB		 509static int __init iscsi_target_init_module(void)
510{
511 int ret = 0;
512
513 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
514
515 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
516 if (!iscsit_global) {
517 pr_err("Unable to allocate memory for iscsit_global\n");
518 return -1;
519 }
520 mutex_init(&auth_id_lock);
521 spin_lock_init(&sess_idr_lock);
522 idr_init(&tiqn_idr);
523 idr_init(&sess_idr);
524
525 ret = iscsi_target_register_configfs();
526 if (ret < 0)
527 goto out;
528
529 ret = iscsi_thread_set_init();
530 if (ret < 0)
531 goto configfs_out;
532
533 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
534 TARGET_THREAD_SET_COUNT) {
535 pr_err("iscsi_allocate_thread_sets() returned"
536 " unexpected value!\n");
537 goto ts_out1;
538 }
539
e48354ce
NB		 540 lio_qr_cache = kmem_cache_create("lio_qr_cache",
541 sizeof(struct iscsi_queue_req),
542 __alignof__(struct iscsi_queue_req), 0, NULL);
543 if (!lio_qr_cache) {
544 pr_err("nable to kmem_cache_create() for"
545 " lio_qr_cache\n");
d703ce2f 546 goto ts_out2;
e48354ce
NB		 547 }
548
549 lio_dr_cache = kmem_cache_create("lio_dr_cache",
550 sizeof(struct iscsi_datain_req),
551 __alignof__(struct iscsi_datain_req), 0, NULL);
552 if (!lio_dr_cache) {
553 pr_err("Unable to kmem_cache_create() for"
554 " lio_dr_cache\n");
555 goto qr_out;
556 }
557
558 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
559 sizeof(struct iscsi_ooo_cmdsn),
560 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
561 if (!lio_ooo_cache) {
562 pr_err("Unable to kmem_cache_create() for"
563 " lio_ooo_cache\n");
564 goto dr_out;
565 }
566
567 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
568 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
569 0, NULL);
570 if (!lio_r2t_cache) {
571 pr_err("Unable to kmem_cache_create() for"
572 " lio_r2t_cache\n");
573 goto ooo_out;
574 }
575
baa4d64b
NB		 576 iscsit_register_transport(&iscsi_target_transport);
577
e48354ce
NB		 578 if (iscsit_load_discovery_tpg() < 0)
579 goto r2t_out;
580
581 return ret;
582r2t_out:
583 kmem_cache_destroy(lio_r2t_cache);
584ooo_out:
585 kmem_cache_destroy(lio_ooo_cache);
586dr_out:
587 kmem_cache_destroy(lio_dr_cache);
588qr_out:
589 kmem_cache_destroy(lio_qr_cache);
e48354ce
NB		 590ts_out2:
591 iscsi_deallocate_thread_sets();
592ts_out1:
593 iscsi_thread_set_free();
594configfs_out:
595 iscsi_target_deregister_configfs();
596out:
597 kfree(iscsit_global);
598 return -ENOMEM;
599}
600
601static void __exit iscsi_target_cleanup_module(void)
602{
603 iscsi_deallocate_thread_sets();
604 iscsi_thread_set_free();
605 iscsit_release_discovery_tpg();
baa4d64b 606 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 607 kmem_cache_destroy(lio_qr_cache);
608 kmem_cache_destroy(lio_dr_cache);
609 kmem_cache_destroy(lio_ooo_cache);
610 kmem_cache_destroy(lio_r2t_cache);
611
612 iscsi_target_deregister_configfs();
613
614 kfree(iscsit_global);
615}
616
8b1e1244 617static int iscsit_add_reject(
ba159914 618 struct iscsi_conn *conn,
e48354ce 619 u8 reason,
ba159914 620 unsigned char *buf)
e48354ce
NB		 621{
622 struct iscsi_cmd *cmd;
e48354ce
NB		 623
624 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
625 if (!cmd)
626 return -1;
627
628 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 629 cmd->reject_reason = reason;
e48354ce 630
1c3d5794 631 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 632 if (!cmd->buf_ptr) {
633 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 634 iscsit_free_cmd(cmd, false);
e48354ce
NB		 635 return -1;
636 }
e48354ce
NB		 637
638 spin_lock_bh(&conn->cmd_lock);
2fbb471e 639 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 640 spin_unlock_bh(&conn->cmd_lock);
641
642 cmd->i_state = ISTATE_SEND_REJECT;
643 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
644
ba159914 645 return -1;
e48354ce
NB		 646}
647
ba159914
NB		 648static int iscsit_add_reject_from_cmd(
649 struct iscsi_cmd *cmd,
e48354ce 650 u8 reason,
ba159914
NB		 651 bool add_to_conn,
652 unsigned char *buf)
e48354ce
NB		 653{
654 struct iscsi_conn *conn;
e48354ce
NB		 655
656 if (!cmd->conn) {
657 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
658 cmd->init_task_tag);
659 return -1;
660 }
661 conn = cmd->conn;
662
663 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 664 cmd->reject_reason = reason;
e48354ce 665
1c3d5794 666 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 667 if (!cmd->buf_ptr) {
668 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 669 iscsit_free_cmd(cmd, false);
e48354ce
NB		 670 return -1;
671 }
e48354ce
NB		 672
673 if (add_to_conn) {
674 spin_lock_bh(&conn->cmd_lock);
2fbb471e 675 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 676 spin_unlock_bh(&conn->cmd_lock);
677 }
678
679 cmd->i_state = ISTATE_SEND_REJECT;
680 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 681 /*
682 * Perform the kref_put now if se_cmd has already been setup by
683 * scsit_setup_scsi_cmd()
684 */
685 if (cmd->se_cmd.se_tfo != NULL) {
686 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
687 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
688 }
ba159914
NB		 689 return -1;
690}
e48354ce 691
ba159914
NB		 692static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
693 unsigned char *buf)
694{
695 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
696}
697
698int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
699{
700 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 701}
702
703/*
704 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 705 * kernel sockets to copy data in/out.
e48354ce
NB		 706 */
707static int iscsit_map_iovec(
708 struct iscsi_cmd *cmd,
709 struct kvec *iov,
710 u32 data_offset,
711 u32 data_length)
712{
713 u32 i = 0;
714 struct scatterlist *sg;
715 unsigned int page_off;
716
717 /*
bfb79eac 718 * We know each entry in t_data_sg contains a page.
e48354ce 719 */
bfb79eac 720 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 721 page_off = (data_offset % PAGE_SIZE);
722
723 cmd->first_data_sg = sg;
724 cmd->first_data_sg_off = page_off;
725
726 while (data_length) {
727 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
728
729 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
730 iov[i].iov_len = cur_len;
731
732 data_length -= cur_len;
733 page_off = 0;
734 sg = sg_next(sg);
735 i++;
736 }
737
738 cmd->kmapped_nents = i;
739
740 return i;
741}
742
743static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
744{
745 u32 i;
746 struct scatterlist *sg;
747
748 sg = cmd->first_data_sg;
749
750 for (i = 0; i < cmd->kmapped_nents; i++)
751 kunmap(sg_page(&sg[i]));
752}
753
754static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
755{
756 struct iscsi_cmd *cmd;
757
758 conn->exp_statsn = exp_statsn;
759
3e1c81a9
NB		 760 if (conn->sess->sess_ops->RDMAExtensions)
761 return;
762
e48354ce 763 spin_lock_bh(&conn->cmd_lock);
2fbb471e 764 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 765 spin_lock(&cmd->istate_lock);
766 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 767 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 768 cmd->i_state = ISTATE_REMOVE;
769 spin_unlock(&cmd->istate_lock);
770 iscsit_add_cmd_to_immediate_queue(cmd, conn,
771 cmd->i_state);
772 continue;
773 }
774 spin_unlock(&cmd->istate_lock);
775 }
776 spin_unlock_bh(&conn->cmd_lock);
777}
778
779static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
780{
f80e8ed3 781 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 782
c0427f15 783 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 784
785 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
786 if (!cmd->iov_data) {
787 pr_err("Unable to allocate cmd->iov_data\n");
788 return -ENOMEM;
789 }
790
791 cmd->orig_iov_data_count = iov_count;
792 return 0;
793}
794
3e1c81a9
NB		 795int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
796 unsigned char *buf)
e48354ce 797{
3e1c81a9 798 int data_direction, payload_length;
e48354ce 799 struct iscsi_scsi_req *hdr;
d28b1169
AG		 800 int iscsi_task_attr;
801 int sam_task_attr;
e48354ce
NB		 802
803 spin_lock_bh(&conn->sess->session_stats_lock);
804 conn->sess->cmd_pdus++;
805 if (conn->sess->se_sess->se_node_acl) {
806 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
807 conn->sess->se_sess->se_node_acl->num_cmds++;
808 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
809 }
810 spin_unlock_bh(&conn->sess->session_stats_lock);
811
812 hdr = (struct iscsi_scsi_req *) buf;
813 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 814
815 /* FIXME; Add checks for AdditionalHeaderSegment */
816
817 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
818 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
819 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
820 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 821 return iscsit_add_reject_cmd(cmd,
822 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 823 }
824
825 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
826 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
827 /*
828 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
829 * that adds support for RESERVE/RELEASE. There is a bug
830 * add with this new functionality that sets R/W bits when
831 * neither CDB carries any READ or WRITE datapayloads.
832 */
833 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
834 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
835 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
836 goto done;
837 }
838
839 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
840 " set when Expected Data Transfer Length is 0 for"
841 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
ba159914
NB		 842 return iscsit_add_reject_cmd(cmd,
843 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 844 }
845done:
846
847 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
848 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
849 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
850 " MUST be set if Expected Data Transfer Length is not 0."
851 " Bad iSCSI Initiator\n");
ba159914
NB		 852 return iscsit_add_reject_cmd(cmd,
853 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 854 }
855
856 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
857 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
858 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 859 return iscsit_add_reject_cmd(cmd,
860 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 861 }
862
863 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
864 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
865 " Scsi Command PDU.\n");
ba159914
NB		 866 return iscsit_add_reject_cmd(cmd,
867 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 868 }
869
870 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
871 pr_err("ImmediateData=No but DataSegmentLength=%u,"
872 " protocol error.\n", payload_length);
ba159914
NB		 873 return iscsit_add_reject_cmd(cmd,
874 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 875 }
876
ba159914 877 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 878 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
879 pr_err("Expected Data Transfer Length and Length of"
880 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
881 " bit is not set protocol error\n");
ba159914
NB		 882 return iscsit_add_reject_cmd(cmd,
883 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 884 }
885
50e5c87d 886 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 887 pr_err("DataSegmentLength: %u is greater than"
888 " EDTL: %u, protocol error.\n", payload_length,
889 hdr->data_length);
ba159914
NB		 890 return iscsit_add_reject_cmd(cmd,
891 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 892 }
893
21f5aa7e 894 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 895 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 896 " MaxXmitDataSegmentLength: %u, protocol error.\n",
897 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 898 return iscsit_add_reject_cmd(cmd,
899 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 900 }
901
902 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
903 pr_err("DataSegmentLength: %u is greater than"
904 " FirstBurstLength: %u, protocol error.\n",
905 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 906 return iscsit_add_reject_cmd(cmd,
907 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 908 }
909
910 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
911 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
912 DMA_NONE;
913
d28b1169 914 cmd->data_direction = data_direction;
d28b1169
AG		 915 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
916 /*
917 * Figure out the SAM Task Attribute for the incoming SCSI CDB
918 */
919 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
920 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
921 sam_task_attr = MSG_SIMPLE_TAG;
922 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
923 sam_task_attr = MSG_ORDERED_TAG;
924 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
925 sam_task_attr = MSG_HEAD_TAG;
926 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
927 sam_task_attr = MSG_ACA_TAG;
928 else {
929 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
930 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
931 sam_task_attr = MSG_SIMPLE_TAG;
932 }
933
e48354ce
NB		 934 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
935 cmd->i_state = ISTATE_NEW_CMD;
936 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
937 cmd->immediate_data = (payload_length) ? 1 : 0;
938 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
939 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
940 if (cmd->unsolicited_data)
941 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
942
943 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
944 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
945 spin_lock_bh(&conn->sess->ttt_lock);
946 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
947 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
948 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
949 spin_unlock_bh(&conn->sess->ttt_lock);
950 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
951 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 952 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
953 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 954 cmd->first_burst_len = payload_length;
955
3e1c81a9
NB		 956 if (!conn->sess->sess_ops->RDMAExtensions &&
957 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 958 struct iscsi_datain_req *dr;
959
960 dr = iscsit_allocate_datain_req();
961 if (!dr)
ba159914
NB		 962 return iscsit_add_reject_cmd(cmd,
963 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 964
965 iscsit_attach_datain_req(cmd, dr);
966 }
967
065ca1e4
AG		 968 /*
969 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
970 */
971 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 972 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
973 cmd->data_direction, sam_task_attr,
974 cmd->sense_buffer + 2);
065ca1e4
AG		 975
976 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
977 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 978 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
979 conn->cid);
980
981 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 982
de103c93
CH		 983 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
984 scsilun_to_int(&hdr->lun));
985 if (cmd->sense_reason)
986 goto attach_cmd;
987
988 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
989 if (cmd->sense_reason) {
990 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 991 return iscsit_add_reject_cmd(cmd,
992 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 993 }
de103c93 994
e48354ce
NB		 995 goto attach_cmd;
996 }
a12f41f8 997
de103c93 998 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 999 return iscsit_add_reject_cmd(cmd,
1000 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1001 }
1002
1003attach_cmd:
1004 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1005 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1006 spin_unlock_bh(&conn->cmd_lock);
1007 /*
1008 * Check if we need to delay processing because of ALUA
1009 * Active/NonOptimized primary access state..
1010 */
1011 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1012
3e1c81a9
NB		 1013 return 0;
1014}
1015EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1016
3e1c81a9
NB		 1017void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1018{
1019 iscsit_set_dataout_sequence_values(cmd);
1020
1021 spin_lock_bh(&cmd->dataout_timeout_lock);
1022 iscsit_start_dataout_timer(cmd, cmd->conn);
1023 spin_unlock_bh(&cmd->dataout_timeout_lock);
1024}
1025EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1026
1027int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1028 struct iscsi_scsi_req *hdr)
1029{
1030 int cmdsn_ret = 0;
e48354ce
NB		 1031 /*
1032 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1033 * the Immediate Bit is not set, and no Immediate
1034 * Data is attached.
1035 *
1036 * A PDU/CmdSN carrying Immediate Data can only
1037 * be processed after the DataCRC has passed.
1038 * If the DataCRC fails, the CmdSN MUST NOT
1039 * be acknowledged. (See below)
1040 */
1041 if (!cmd->immediate_data) {
561bf158
NB		 1042 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1043 (unsigned char *)hdr, hdr->cmdsn);
1044 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1045 return -1;
1046 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1047 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1048 return 0;
3e1c81a9 1049 }
e48354ce
NB		 1050 }
1051
50e5c87d 1052 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1053
1054 /*
1055 * If no Immediate Data is attached, it's OK to return now.
1056 */
1057 if (!cmd->immediate_data) {
3e1c81a9
NB		 1058 if (!cmd->sense_reason && cmd->unsolicited_data)
1059 iscsit_set_unsoliticed_dataout(cmd);
1060 if (!cmd->sense_reason)
1061 return 0;
e48354ce 1062
3e1c81a9 1063 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1064 return 0;
1065 }
1066
1067 /*
3e1c81a9
NB		 1068 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1069 * execution. These exceptions are processed in CmdSN order using
1070 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1071 */
de103c93 1072 if (cmd->sense_reason) {
561bf158
NB		 1073 if (cmd->reject_reason)
1074 return 0;
1075
3e1c81a9 1076 return 1;
e48354ce
NB		 1077 }
1078 /*
1079 * Call directly into transport_generic_new_cmd() to perform
1080 * the backend memory allocation.
1081 */
de103c93 1082 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1083 if (cmd->sense_reason)
3e1c81a9 1084 return 1;
e48354ce 1085
3e1c81a9
NB		 1086 return 0;
1087}
1088EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1089
1090static int
1091iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1092 bool dump_payload)
1093{
561bf158 1094 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1095 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1096 /*
1097 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1098 */
1099 if (dump_payload == true)
1100 goto after_immediate_data;
1101
1102 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1103 cmd->first_burst_len);
e48354ce
NB		 1104after_immediate_data:
1105 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1106 /*
1107 * A PDU/CmdSN carrying Immediate Data passed
1108 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1109 * Immediate Bit is not set.
1110 */
561bf158
NB		 1111 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1112 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1113 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1114 return -1;
3e1c81a9 1115
9d86a2be 1116 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1117 int rc;
1118
1119 rc = iscsit_dump_data_payload(cmd->conn,
1120 cmd->first_burst_len, 1);
1121 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1122 return rc;
3e1c81a9
NB		 1123 } else if (cmd->unsolicited_data)
1124 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1125
e48354ce
NB		 1126 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1127 /*
1128 * Immediate Data failed DataCRC and ERL>=1,
1129 * silently drop this PDU and let the initiator
1130 * plug the CmdSN gap.
1131 *
1132 * FIXME: Send Unsolicited NOPIN with reserved
1133 * TTT here to help the initiator figure out
1134 * the missing CmdSN, although they should be
1135 * intelligent enough to determine the missing
1136 * CmdSN and issue a retry to plug the sequence.
1137 */
1138 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1139 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1140 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1141 return -1;
1142
1143 return 0;
1144}
1145
3e1c81a9
NB		 1146static int
1147iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1148 unsigned char *buf)
1149{
1150 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1151 int rc, immed_data;
1152 bool dump_payload = false;
1153
1154 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1155 if (rc < 0)
561bf158 1156 return 0;
3e1c81a9
NB		 1157 /*
1158 * Allocation iovecs needed for struct socket operations for
1159 * traditional iSCSI block I/O.
1160 */
1161 if (iscsit_allocate_iovecs(cmd) < 0) {
ba159914
NB		 1162 return iscsit_add_reject_cmd(cmd,
1163 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1164 }
1165 immed_data = cmd->immediate_data;
1166
1167 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1168 if (rc < 0)
1169 return rc;
1170 else if (rc > 0)
1171 dump_payload = true;
1172
1173 if (!immed_data)
1174 return 0;
1175
1176 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1177}
1178
e48354ce
NB		 1179static u32 iscsit_do_crypto_hash_sg(
1180 struct hash_desc *hash,
1181 struct iscsi_cmd *cmd,
1182 u32 data_offset,
1183 u32 data_length,
1184 u32 padding,
1185 u8 *pad_bytes)
1186{
1187 u32 data_crc;
1188 u32 i;
1189 struct scatterlist *sg;
1190 unsigned int page_off;
1191
1192 crypto_hash_init(hash);
1193
1194 sg = cmd->first_data_sg;
1195 page_off = cmd->first_data_sg_off;
1196
1197 i = 0;
1198 while (data_length) {
1199 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1200
1201 crypto_hash_update(hash, &sg[i], cur_len);
1202
1203 data_length -= cur_len;
1204 page_off = 0;
1205 i++;
1206 }
1207
1208 if (padding) {
1209 struct scatterlist pad_sg;
1210
1211 sg_init_one(&pad_sg, pad_bytes, padding);
1212 crypto_hash_update(hash, &pad_sg, padding);
1213 }
1214 crypto_hash_final(hash, (u8 *) &data_crc);
1215
1216 return data_crc;
1217}
1218
1219static void iscsit_do_crypto_hash_buf(
1220 struct hash_desc *hash,
80690fdb 1221 const void *buf,
e48354ce
NB		 1222 u32 payload_length,
1223 u32 padding,
1224 u8 *pad_bytes,
1225 u8 *data_crc)
1226{
1227 struct scatterlist sg;
1228
1229 crypto_hash_init(hash);
1230
8359cf43 1231 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1232 crypto_hash_update(hash, &sg, payload_length);
1233
1234 if (padding) {
1235 sg_init_one(&sg, pad_bytes, padding);
1236 crypto_hash_update(hash, &sg, padding);
1237 }
1238 crypto_hash_final(hash, data_crc);
1239}
1240
3e1c81a9
NB		 1241int
1242iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1243 struct iscsi_cmd **out_cmd)
e48354ce 1244{
3e1c81a9 1245 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1246 struct iscsi_cmd *cmd = NULL;
1247 struct se_cmd *se_cmd;
3e1c81a9
NB		 1248 u32 payload_length = ntoh24(hdr->dlength);
1249 int rc;
e48354ce
NB		 1250
1251 if (!payload_length) {
1252 pr_err("DataOUT payload is ZERO, protocol error.\n");
ba159914
NB		 1253 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1254 buf);
e48354ce
NB		 1255 }
1256
1257 /* iSCSI write */
1258 spin_lock_bh(&conn->sess->session_stats_lock);
1259 conn->sess->rx_data_octets += payload_length;
1260 if (conn->sess->se_sess->se_node_acl) {
1261 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1262 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1263 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1264 }
1265 spin_unlock_bh(&conn->sess->session_stats_lock);
1266
21f5aa7e 1267 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1268 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1269 " MaxXmitDataSegmentLength: %u\n", payload_length,
1270 conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1271 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1272 buf);
e48354ce
NB		 1273 }
1274
1275 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1276 payload_length);
1277 if (!cmd)
1278 return 0;
1279
1280 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1281 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1282 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1283 payload_length, conn->cid);
1284
1285 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1286 pr_err("Command ITT: 0x%08x received DataOUT after"
1287 " last DataOUT received, dumping payload\n",
1288 cmd->init_task_tag);
1289 return iscsit_dump_data_payload(conn, payload_length, 1);
1290 }
1291
1292 if (cmd->data_direction != DMA_TO_DEVICE) {
1293 pr_err("Command ITT: 0x%08x received DataOUT for a"
1294 " NON-WRITE command.\n", cmd->init_task_tag);
ba159914 1295 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1296 }
1297 se_cmd = &cmd->se_cmd;
1298 iscsit_mod_dataout_timer(cmd);
1299
50e5c87d 1300 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1301 pr_err("DataOut Offset: %u, Length %u greater than"
1302 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1303 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1304 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1305 }
1306
1307 if (cmd->unsolicited_data) {
1308 int dump_unsolicited_data = 0;
1309
1310 if (conn->sess->sess_ops->InitialR2T) {
1311 pr_err("Received unexpected unsolicited data"
1312 " while InitialR2T=Yes, protocol error.\n");
1313 transport_send_check_condition_and_sense(&cmd->se_cmd,
1314 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1315 return -1;
1316 }
1317 /*
1318 * Special case for dealing with Unsolicited DataOUT
1319 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1320 * failures;
1321 */
1322
1323 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1324 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1325 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1326 dump_unsolicited_data = 1;
e48354ce
NB		 1327
1328 if (dump_unsolicited_data) {
1329 /*
1330 * Check if a delayed TASK_ABORTED status needs to
1331 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1332 * received with the unsolicitied data out.
1333 */
1334 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1335 iscsit_stop_dataout_timer(cmd);
1336
1337 transport_check_aborted_status(se_cmd,
1338 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1339 return iscsit_dump_data_payload(conn, payload_length, 1);
1340 }
1341 } else {
1342 /*
1343 * For the normal solicited data path:
1344 *
1345 * Check for a delayed TASK_ABORTED status and dump any
1346 * incoming data out payload if one exists. Also, when the
1347 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1348 * data out sequence, we decrement outstanding_r2ts. Once
1349 * outstanding_r2ts reaches zero, go ahead and send the delayed
1350 * TASK_ABORTED status.
1351 */
7d680f3b 1352 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1353 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1354 if (--cmd->outstanding_r2ts < 1) {
1355 iscsit_stop_dataout_timer(cmd);
1356 transport_check_aborted_status(
1357 se_cmd, 1);
1358 }
1359
1360 return iscsit_dump_data_payload(conn, payload_length, 1);
1361 }
1362 }
1363 /*
1364 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1365 * within-command recovery checks before receiving the payload.
1366 */
3e1c81a9
NB		 1367 rc = iscsit_check_pre_dataout(cmd, buf);
1368 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1369 return 0;
3e1c81a9 1370 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1371 return -1;
1372
3e1c81a9
NB		 1373 *out_cmd = cmd;
1374 return 0;
1375}
1376EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1377
1378static int
1379iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1380 struct iscsi_data *hdr)
1381{
1382 struct kvec *iov;
1383 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1384 u32 payload_length = ntoh24(hdr->dlength);
1385 int iov_ret, data_crc_failed = 0;
1386
e48354ce
NB		 1387 rx_size += payload_length;
1388 iov = &cmd->iov_data[0];
1389
50e5c87d
CH		 1390 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1391 payload_length);
e48354ce
NB		 1392 if (iov_ret < 0)
1393 return -1;
1394
1395 iov_count += iov_ret;
1396
1397 padding = ((-payload_length) & 3);
1398 if (padding != 0) {
1399 iov[iov_count].iov_base = cmd->pad_bytes;
1400 iov[iov_count++].iov_len = padding;
1401 rx_size += padding;
1402 pr_debug("Receiving %u padding bytes.\n", padding);
1403 }
1404
1405 if (conn->conn_ops->DataDigest) {
1406 iov[iov_count].iov_base = &checksum;
1407 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1408 rx_size += ISCSI_CRC_LEN;
1409 }
1410
1411 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1412
1413 iscsit_unmap_iovec(cmd);
1414
1415 if (rx_got != rx_size)
1416 return -1;
1417
1418 if (conn->conn_ops->DataDigest) {
1419 u32 data_crc;
1420
1421 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1422 be32_to_cpu(hdr->offset),
1423 payload_length, padding,
e48354ce
NB		 1424 cmd->pad_bytes);
1425
1426 if (checksum != data_crc) {
1427 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1428 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1429 " does not match computed 0x%08x\n",
1430 hdr->itt, hdr->offset, payload_length,
1431 hdr->datasn, checksum, data_crc);
1432 data_crc_failed = 1;
1433 } else {
1434 pr_debug("Got CRC32C DataDigest 0x%08x for"
1435 " %u bytes of Data Out\n", checksum,
1436 payload_length);
1437 }
1438 }
3e1c81a9
NB		 1439
1440 return data_crc_failed;
1441}
1442
1443int
1444iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1445 bool data_crc_failed)
1446{
1447 struct iscsi_conn *conn = cmd->conn;
1448 int rc, ooo_cmdsn;
e48354ce
NB		 1449 /*
1450 * Increment post receive data and CRC values or perform
1451 * within-command recovery.
1452 */
3e1c81a9
NB		 1453 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1454 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1455 return 0;
3e1c81a9 1456 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1457 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1458 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1459 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1460 /*
1461 * Handle extra special case for out of order
1462 * Unsolicited Data Out.
1463 */
1464 spin_lock_bh(&cmd->istate_lock);
1465 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1466 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1467 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1468 spin_unlock_bh(&cmd->istate_lock);
1469
1470 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1471 if (ooo_cmdsn)
1472 return 0;
1473 target_execute_cmd(&cmd->se_cmd);
1474 return 0;
e48354ce
NB		 1475 } else /* DATAOUT_CANNOT_RECOVER */
1476 return -1;
1477
1478 return 0;
1479}
3e1c81a9 1480EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1481
3e1c81a9
NB		 1482static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1483{
1484 struct iscsi_cmd *cmd;
1485 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1486 int rc;
1487 bool data_crc_failed = false;
1488
1489 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1490 if (rc < 0)
561bf158 1491 return 0;
3e1c81a9
NB		 1492 else if (!cmd)
1493 return 0;
1494
1495 rc = iscsit_get_dataout(conn, cmd, hdr);
1496 if (rc < 0)
1497 return rc;
1498 else if (rc > 0)
1499 data_crc_failed = true;
1500
1501 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1502}
1503
778de368
NB		 1504int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1505 struct iscsi_nopout *hdr)
e48354ce 1506{
778de368 1507 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1508
66c7db68 1509 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1510 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1511 " not set, protocol error.\n");
28aaa950
NB		 1512 if (!cmd)
1513 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1514 (unsigned char *)hdr);
1515
ba159914
NB		 1516 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1517 (unsigned char *)hdr);
e48354ce
NB		 1518 }
1519
21f5aa7e 1520 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1521 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1522 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1523 " error.\n", payload_length,
21f5aa7e 1524 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1525 if (!cmd)
1526 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1527 (unsigned char *)hdr);
1528
ba159914
NB		 1529 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
e48354ce
NB		 1531 }
1532
3e1c81a9 1533 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1534 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1535 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1536 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1537 payload_length);
1538 /*
1539 * This is not a response to a Unsolicited NopIN, which means
1540 * it can either be a NOPOUT ping request (with a valid ITT),
1541 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1542 * Either way, make sure we allocate an struct iscsi_cmd, as both
1543 * can contain ping data.
1544 */
50e5c87d 1545 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1546 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1547 cmd->i_state = ISTATE_SEND_NOPIN;
1548 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1549 1 : 0);
1550 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1551 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1552 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1553 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1554 cmd->data_direction = DMA_NONE;
1555 }
1556
778de368
NB		 1557 return 0;
1558}
1559EXPORT_SYMBOL(iscsit_setup_nop_out);
1560
1561int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1562 struct iscsi_nopout *hdr)
1563{
1564 struct iscsi_cmd *cmd_p = NULL;
1565 int cmdsn_ret = 0;
1566 /*
1567 * Initiator is expecting a NopIN ping reply..
1568 */
1569 if (hdr->itt != RESERVED_ITT) {
1570 BUG_ON(!cmd);
1571
1572 spin_lock_bh(&conn->cmd_lock);
1573 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1574 spin_unlock_bh(&conn->cmd_lock);
1575
1576 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1577
1578 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1579 iscsit_add_cmd_to_response_queue(cmd, conn,
1580 cmd->i_state);
1581 return 0;
1582 }
1583
561bf158
NB		 1584 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1585 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1586 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1587 return 0;
778de368 1588 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1589 return -1;
778de368
NB		 1590
1591 return 0;
1592 }
1593 /*
1594 * This was a response to a unsolicited NOPIN ping.
1595 */
1596 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1597 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1598 if (!cmd_p)
1599 return -EINVAL;
1600
1601 iscsit_stop_nopin_response_timer(conn);
1602
1603 cmd_p->i_state = ISTATE_REMOVE;
1604 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1605
1606 iscsit_start_nopin_timer(conn);
1607 return 0;
1608 }
1609 /*
1610 * Otherwise, initiator is not expecting a NOPIN is response.
1611 * Just ignore for now.
1612 */
1613 return 0;
1614}
1615EXPORT_SYMBOL(iscsit_process_nop_out);
1616
1617static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1618 unsigned char *buf)
1619{
1620 unsigned char *ping_data = NULL;
1621 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1622 struct kvec *iov = NULL;
1623 u32 payload_length = ntoh24(hdr->dlength);
1624 int ret;
1625
1626 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1627 if (ret < 0)
561bf158 1628 return 0;
778de368
NB		 1629 /*
1630 * Handle NOP-OUT payload for traditional iSCSI sockets
1631 */
50e5c87d 1632 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1633 u32 checksum, data_crc, padding = 0;
1634 int niov = 0, rx_got, rx_size = payload_length;
1635
e48354ce
NB		 1636 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1637 if (!ping_data) {
1638 pr_err("Unable to allocate memory for"
1639 " NOPOUT ping data.\n");
1640 ret = -1;
1641 goto out;
1642 }
1643
1644 iov = &cmd->iov_misc[0];
1645 iov[niov].iov_base = ping_data;
1646 iov[niov++].iov_len = payload_length;
1647
1648 padding = ((-payload_length) & 3);
1649 if (padding != 0) {
1650 pr_debug("Receiving %u additional bytes"
1651 " for padding.\n", padding);
1652 iov[niov].iov_base = &cmd->pad_bytes;
1653 iov[niov++].iov_len = padding;
1654 rx_size += padding;
1655 }
1656 if (conn->conn_ops->DataDigest) {
1657 iov[niov].iov_base = &checksum;
1658 iov[niov++].iov_len = ISCSI_CRC_LEN;
1659 rx_size += ISCSI_CRC_LEN;
1660 }
1661
1662 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1663 if (rx_got != rx_size) {
1664 ret = -1;
1665 goto out;
1666 }
1667
1668 if (conn->conn_ops->DataDigest) {
1669 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1670 ping_data, payload_length,
1671 padding, cmd->pad_bytes,
1672 (u8 *)&data_crc);
1673
1674 if (checksum != data_crc) {
1675 pr_err("Ping data CRC32C DataDigest"
1676 " 0x%08x does not match computed 0x%08x\n",
1677 checksum, data_crc);
1678 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1679 pr_err("Unable to recover from"
1680 " NOPOUT Ping DataCRC failure while in"
1681 " ERL=0.\n");
1682 ret = -1;
1683 goto out;
1684 } else {
1685 /*
1686 * Silently drop this PDU and let the
1687 * initiator plug the CmdSN gap.
1688 */
1689 pr_debug("Dropping NOPOUT"
1690 " Command CmdSN: 0x%08x due to"
1691 " DataCRC error.\n", hdr->cmdsn);
1692 ret = 0;
1693 goto out;
1694 }
1695 } else {
1696 pr_debug("Got CRC32C DataDigest"
1697 " 0x%08x for %u bytes of ping data.\n",
1698 checksum, payload_length);
1699 }
1700 }
1701
1702 ping_data[payload_length] = '\0';
1703 /*
1704 * Attach ping data to struct iscsi_cmd->buf_ptr.
1705 */
8359cf43 1706 cmd->buf_ptr = ping_data;
e48354ce
NB		 1707 cmd->buf_ptr_size = payload_length;
1708
1709 pr_debug("Got %u bytes of NOPOUT ping"
1710 " data.\n", payload_length);
1711 pr_debug("Ping Data: \"%s\"\n", ping_data);
1712 }
1713
778de368 1714 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1715out:
1716 if (cmd)
aafc9d15 1717 iscsit_free_cmd(cmd, false);
778de368 1718
e48354ce
NB		 1719 kfree(ping_data);
1720 return ret;
1721}
1722
3e1c81a9
NB		 1723int
1724iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1725 unsigned char *buf)
e48354ce 1726{
e48354ce
NB		 1727 struct se_tmr_req *se_tmr;
1728 struct iscsi_tmr_req *tmr_req;
1729 struct iscsi_tm *hdr;
186a9647
NB		 1730 int out_of_order_cmdsn = 0, ret;
1731 bool sess_ref = false;
e48354ce
NB		 1732 u8 function;
1733
1734 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1735 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1736 function = hdr->flags;
1737
1738 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1739 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1740 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1741 hdr->rtt, hdr->refcmdsn, conn->cid);
1742
1743 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1744 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1745 hdr->rtt != RESERVED_ITT)) {
e48354ce 1746 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1747 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1748 }
1749
1750 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1751 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1752 pr_err("Task Management Request TASK_REASSIGN not"
1753 " issued as immediate command, bad iSCSI Initiator"
1754 "implementation\n");
ba159914
NB		 1755 return iscsit_add_reject_cmd(cmd,
1756 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1757 }
1758 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1759 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1760 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1761
d28b1169
AG		 1762 cmd->data_direction = DMA_NONE;
1763
1764 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1765 if (!cmd->tmr_req) {
1766 pr_err("Unable to allocate memory for"
1767 " Task Management command!\n");
ba159914
NB		 1768 return iscsit_add_reject_cmd(cmd,
1769 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1770 buf);
d28b1169
AG		 1771 }
1772
1773 /*
1774 * TASK_REASSIGN for ERL=2 / connection stays inside of
1775 * LIO-Target $FABRIC_MOD
1776 */
1777 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1778
1779 u8 tcm_function;
1780 int ret;
1781
1782 transport_init_se_cmd(&cmd->se_cmd,
1783 &lio_target_fabric_configfs->tf_ops,
1784 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1785 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1786
186a9647
NB		 1787 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1788 sess_ref = true;
1789
d28b1169
AG		 1790 switch (function) {
1791 case ISCSI_TM_FUNC_ABORT_TASK:
1792 tcm_function = TMR_ABORT_TASK;
1793 break;
1794 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1795 tcm_function = TMR_ABORT_TASK_SET;
1796 break;
1797 case ISCSI_TM_FUNC_CLEAR_ACA:
1798 tcm_function = TMR_CLEAR_ACA;
1799 break;
1800 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1801 tcm_function = TMR_CLEAR_TASK_SET;
1802 break;
1803 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1804 tcm_function = TMR_LUN_RESET;
1805 break;
1806 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1807 tcm_function = TMR_TARGET_WARM_RESET;
1808 break;
1809 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1810 tcm_function = TMR_TARGET_COLD_RESET;
1811 break;
1812 default:
1813 pr_err("Unknown iSCSI TMR Function:"
1814 " 0x%02x\n", function);
ba159914
NB		 1815 return iscsit_add_reject_cmd(cmd,
1816 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1817 }
1818
1819 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1820 tcm_function, GFP_KERNEL);
1821 if (ret < 0)
ba159914
NB		 1822 return iscsit_add_reject_cmd(cmd,
1823 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1824
1825 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1826 }
e48354ce
NB		 1827
1828 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1829 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1830 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1831 cmd->init_task_tag = hdr->itt;
1832 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1833 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1834 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1835 se_tmr = cmd->se_cmd.se_tmr_req;
1836 tmr_req = cmd->tmr_req;
1837 /*
1838 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1839 */
1840 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1841 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1842 scsilun_to_int(&hdr->lun));
e48354ce 1843 if (ret < 0) {
e48354ce
NB		 1844 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1845 goto attach;
1846 }
1847 }
1848
1849 switch (function) {
1850 case ISCSI_TM_FUNC_ABORT_TASK:
1851 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1852 if (se_tmr->response)
e48354ce 1853 goto attach;
e48354ce
NB		 1854 break;
1855 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1856 case ISCSI_TM_FUNC_CLEAR_ACA:
1857 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1858 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1859 break;
1860 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1861 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1862 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1863 goto attach;
1864 }
1865 break;
1866 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1867 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1868 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1869 goto attach;
1870 }
1871 break;
1872 case ISCSI_TM_FUNC_TASK_REASSIGN:
1873 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1874 /*
1875 * Perform sanity checks on the ExpDataSN only if the
1876 * TASK_REASSIGN was successful.
1877 */
de103c93 1878 if (se_tmr->response)
e48354ce
NB		 1879 break;
1880
1881 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 1882 return iscsit_add_reject_cmd(cmd,
1883 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1884 break;
1885 default:
1886 pr_err("Unknown TMR function: 0x%02x, protocol"
1887 " error.\n", function);
e48354ce
NB		 1888 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1889 goto attach;
1890 }
1891
1892 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1893 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1894 se_tmr->call_transport = 1;
1895attach:
1896 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1897 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1898 spin_unlock_bh(&conn->cmd_lock);
1899
1900 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 1901 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1902 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1903 out_of_order_cmdsn = 1;
5a4c8666 1904 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1905 return 0;
5a4c8666 1906 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1907 return -1;
e48354ce 1908 }
50e5c87d 1909 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1910
5a4c8666 1911 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1912 return 0;
1913 /*
1914 * Found the referenced task, send to transport for processing.
1915 */
1916 if (se_tmr->call_transport)
1917 return transport_generic_handle_tmr(&cmd->se_cmd);
1918
1919 /*
1920 * Could not find the referenced LUN, task, or Task Management
1921 * command not authorized or supported. Change state and
1922 * let the tx_thread send the response.
1923 *
1924 * For connection recovery, this is also the default action for
1925 * TMR TASK_REASSIGN.
1926 */
186a9647
NB		 1927 if (sess_ref) {
1928 pr_debug("Handle TMR, using sess_ref=true check\n");
1929 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1930 }
1931
e48354ce
NB		 1932 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1933 return 0;
1934}
3e1c81a9 1935EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1936
1937/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 1938int
1939iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1940 struct iscsi_text *hdr)
e48354ce 1941{
64534aa7 1942 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1943
21f5aa7e 1944 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1945 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1946 "greater than MaxXmitDataSegmentLength %u.\n",
1947 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1948 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1949 (unsigned char *)hdr);
e48354ce
NB		 1950 }
1951
1952 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1953 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1954 hdr->exp_statsn, payload_length);
1955
64534aa7
NB		 1956 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1957 cmd->i_state = ISTATE_SEND_TEXTRSP;
1958 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1959 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1960 cmd->targ_xfer_tag = 0xFFFFFFFF;
1961 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1962 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1963 cmd->data_direction = DMA_NONE;
1964
1965 return 0;
1966}
1967EXPORT_SYMBOL(iscsit_setup_text_cmd);
1968
1969int
1970iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1971 struct iscsi_text *hdr)
1972{
9864ca9d 1973 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 1974 int cmdsn_ret;
1975
9864ca9d
NB		 1976 if (!text_in) {
1977 pr_err("Unable to locate text_in buffer for sendtargets"
1978 " discovery\n");
1979 goto reject;
1980 }
1981 if (strncmp("SendTargets", text_in, 11) != 0) {
1982 pr_err("Received Text Data that is not"
1983 " SendTargets, cannot continue.\n");
1984 goto reject;
1985 }
1986 text_ptr = strchr(text_in, '=');
1987 if (!text_ptr) {
1988 pr_err("No \"=\" separator found in Text Data,"
1989 " cannot continue.\n");
1990 goto reject;
1991 }
1992 if (!strncmp("=All", text_ptr, 4)) {
1993 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
6665889c
NB		 1994 } else if (!strncmp("=iqn.", text_ptr, 5) ||
1995 !strncmp("=eui.", text_ptr, 5)) {
1996 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
9864ca9d
NB		 1997 } else {
1998 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
1999 goto reject;
2000 }
2001
64534aa7
NB		 2002 spin_lock_bh(&conn->cmd_lock);
2003 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2004 spin_unlock_bh(&conn->cmd_lock);
2005
2006 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2007
2008 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2009 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2010 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2011 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2012 return -1;
2013
64534aa7
NB		 2014 return 0;
2015 }
2016
2017 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2018
2019reject:
ba159914
NB		 2020 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2021 (unsigned char *)hdr);
64534aa7
NB		 2022}
2023EXPORT_SYMBOL(iscsit_process_text_cmd);
2024
2025static int
2026iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2027 unsigned char *buf)
2028{
2029 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2030 char *text_in = NULL;
2031 u32 payload_length = ntoh24(hdr->dlength);
2032 int rx_size, rc;
2033
2034 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2035 if (rc < 0)
561bf158 2036 return 0;
64534aa7
NB		 2037
2038 rx_size = payload_length;
2039 if (payload_length) {
64534aa7
NB		 2040 u32 checksum = 0, data_crc = 0;
2041 u32 padding = 0, pad_bytes = 0;
2042 int niov = 0, rx_got;
2043 struct kvec iov[3];
2044
2045 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2046 if (!text_in) {
2047 pr_err("Unable to allocate memory for"
2048 " incoming text parameters\n");
64534aa7 2049 goto reject;
e48354ce 2050 }
9864ca9d 2051 cmd->text_in_ptr = text_in;
e48354ce
NB		 2052
2053 memset(iov, 0, 3 * sizeof(struct kvec));
2054 iov[niov].iov_base = text_in;
64534aa7 2055 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2056
2057 padding = ((-payload_length) & 3);
2058 if (padding != 0) {
76f1928e 2059 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2060 iov[niov++].iov_len = padding;
2061 rx_size += padding;
2062 pr_debug("Receiving %u additional bytes"
2063 " for padding.\n", padding);
2064 }
2065 if (conn->conn_ops->DataDigest) {
2066 iov[niov].iov_base = &checksum;
2067 iov[niov++].iov_len = ISCSI_CRC_LEN;
2068 rx_size += ISCSI_CRC_LEN;
2069 }
2070
2071 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2072 if (rx_got != rx_size)
2073 goto reject;
e48354ce
NB		 2074
2075 if (conn->conn_ops->DataDigest) {
2076 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
64534aa7 2077 text_in, payload_length,
76f1928e 2078 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2079 (u8 *)&data_crc);
2080
2081 if (checksum != data_crc) {
2082 pr_err("Text data CRC32C DataDigest"
2083 " 0x%08x does not match computed"
2084 " 0x%08x\n", checksum, data_crc);
2085 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2086 pr_err("Unable to recover from"
2087 " Text Data digest failure while in"
2088 " ERL=0.\n");
64534aa7 2089 goto reject;
e48354ce
NB		 2090 } else {
2091 /*
2092 * Silently drop this PDU and let the
2093 * initiator plug the CmdSN gap.
2094 */
2095 pr_debug("Dropping Text"
2096 " Command CmdSN: 0x%08x due to"
2097 " DataCRC error.\n", hdr->cmdsn);
2098 kfree(text_in);
2099 return 0;
2100 }
2101 } else {
2102 pr_debug("Got CRC32C DataDigest"
2103 " 0x%08x for %u bytes of text data.\n",
64534aa7 2104 checksum, payload_length);
e48354ce
NB		 2105 }
2106 }
64534aa7 2107 text_in[payload_length - 1] = '\0';
e48354ce 2108 pr_debug("Successfully read %d bytes of text"
64534aa7 2109 " data.\n", payload_length);
e48354ce
NB		 2110 }
2111
64534aa7 2112 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2113
64534aa7 2114reject:
9864ca9d
NB		 2115 kfree(cmd->text_in_ptr);
2116 cmd->text_in_ptr = NULL;
ba159914 2117 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce 2118}
64534aa7 2119EXPORT_SYMBOL(iscsit_handle_text_cmd);
e48354ce
NB		 2120
2121int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2122{
2123 struct iscsi_conn *conn_p;
2124 struct iscsi_session *sess = conn->sess;
2125
2126 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2127 " for SID: %u.\n", conn->cid, conn->sess->sid);
2128
2129 atomic_set(&sess->session_logout, 1);
2130 atomic_set(&conn->conn_logout_remove, 1);
2131 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2132
2133 iscsit_inc_conn_usage_count(conn);
2134 iscsit_inc_session_usage_count(sess);
2135
2136 spin_lock_bh(&sess->conn_lock);
2137 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2138 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2139 continue;
2140
2141 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2142 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2143 }
2144 spin_unlock_bh(&sess->conn_lock);
2145
2146 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2147
2148 return 0;
2149}
2150
2151int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2152{
2153 struct iscsi_conn *l_conn;
2154 struct iscsi_session *sess = conn->sess;
2155
2156 pr_debug("Received logout request CLOSECONNECTION for CID:"
2157 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2158
2159 /*
2160 * A Logout Request with a CLOSECONNECTION reason code for a CID
2161 * can arrive on a connection with a differing CID.
2162 */
2163 if (conn->cid == cmd->logout_cid) {
2164 spin_lock_bh(&conn->state_lock);
2165 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2166 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2167
2168 atomic_set(&conn->conn_logout_remove, 1);
2169 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2170 iscsit_inc_conn_usage_count(conn);
2171
2172 spin_unlock_bh(&conn->state_lock);
2173 } else {
2174 /*
2175 * Handle all different cid CLOSECONNECTION requests in
2176 * iscsit_logout_post_handler_diffcid() as to give enough
2177 * time for any non immediate command's CmdSN to be
2178 * acknowledged on the connection in question.
2179 *
2180 * Here we simply make sure the CID is still around.
2181 */
2182 l_conn = iscsit_get_conn_from_cid(sess,
2183 cmd->logout_cid);
2184 if (!l_conn) {
2185 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2186 iscsit_add_cmd_to_response_queue(cmd, conn,
2187 cmd->i_state);
2188 return 0;
2189 }
2190
2191 iscsit_dec_conn_usage_count(l_conn);
2192 }
2193
2194 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2195
2196 return 0;
2197}
2198
2199int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2200{
2201 struct iscsi_session *sess = conn->sess;
2202
2203 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2204 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2205
2206 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2207 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2208 " while ERL!=2.\n");
2209 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2210 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2211 return 0;
2212 }
2213
2214 if (conn->cid == cmd->logout_cid) {
2215 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2216 " with CID: %hu on CID: %hu, implementation error.\n",
2217 cmd->logout_cid, conn->cid);
2218 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2219 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2220 return 0;
2221 }
2222
2223 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2224
2225 return 0;
2226}
2227
3e1c81a9
NB		 2228int
2229iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2230 unsigned char *buf)
e48354ce
NB		 2231{
2232 int cmdsn_ret, logout_remove = 0;
2233 u8 reason_code = 0;
e48354ce
NB		 2234 struct iscsi_logout *hdr;
2235 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2236
2237 hdr = (struct iscsi_logout *) buf;
2238 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2239
2240 if (tiqn) {
2241 spin_lock(&tiqn->logout_stats.lock);
2242 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2243 tiqn->logout_stats.normal_logouts++;
2244 else
2245 tiqn->logout_stats.abnormal_logouts++;
2246 spin_unlock(&tiqn->logout_stats.lock);
2247 }
2248
2249 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2250 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2251 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2252 hdr->cid, conn->cid);
2253
2254 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2255 pr_err("Received logout request on connection that"
2256 " is not in logged in state, ignoring request.\n");
aafc9d15 2257 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2258 return 0;
2259 }
2260
e48354ce
NB		 2261 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2262 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2263 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2264 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2265 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2266 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2267 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2268 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2269 cmd->logout_reason = reason_code;
2270 cmd->data_direction = DMA_NONE;
2271
2272 /*
2273 * We need to sleep in these cases (by returning 1) until the Logout
2274 * Response gets sent in the tx thread.
2275 */
2276 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2277 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2278 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2279 logout_remove = 1;
2280
2281 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2282 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2283 spin_unlock_bh(&conn->cmd_lock);
2284
2285 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2286 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2287
2288 /*
2289 * Immediate commands are executed, well, immediately.
2290 * Non-Immediate Logout Commands are executed in CmdSN order.
2291 */
c6037cc5 2292 if (cmd->immediate_cmd) {
e48354ce
NB		 2293 int ret = iscsit_execute_cmd(cmd, 0);
2294
2295 if (ret < 0)
2296 return ret;
2297 } else {
561bf158 2298 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2299 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2300 logout_remove = 0;
ba159914
NB		 2301 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2302 return -1;
e48354ce
NB		 2303 }
2304
2305 return logout_remove;
2306}
3e1c81a9 2307EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2308
2309static int iscsit_handle_snack(
2310 struct iscsi_conn *conn,
2311 unsigned char *buf)
2312{
e48354ce
NB		 2313 struct iscsi_snack *hdr;
2314
2315 hdr = (struct iscsi_snack *) buf;
2316 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2317
2318 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2319 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2320 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2321 hdr->begrun, hdr->runlength, conn->cid);
2322
2323 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2324 pr_err("Initiator sent SNACK request while in"
2325 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2326 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2327 buf);
e48354ce
NB		 2328 }
2329 /*
2330 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2331 * call from inside iscsi_send_recovery_datain_or_r2t().
2332 */
2333 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2334 case 0:
2335 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2336 hdr->itt,
2337 be32_to_cpu(hdr->ttt),
2338 be32_to_cpu(hdr->begrun),
2339 be32_to_cpu(hdr->runlength));
e48354ce 2340 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2341 return iscsit_handle_status_snack(conn, hdr->itt,
2342 be32_to_cpu(hdr->ttt),
2343 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2344 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2345 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2346 be32_to_cpu(hdr->begrun),
2347 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2348 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2349 /* FIXME: Support R-Data SNACK */
2350 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2351 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2352 buf);
e48354ce
NB		 2353 default:
2354 pr_err("Unknown SNACK type 0x%02x, protocol"
2355 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2356 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2357 buf);
e48354ce
NB		 2358 }
2359
2360 return 0;
2361}
2362
2363static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2364{
2365 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2366 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2367 wait_for_completion_interruptible_timeout(
2368 &conn->rx_half_close_comp,
2369 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2370 }
2371}
2372
2373static int iscsit_handle_immediate_data(
2374 struct iscsi_cmd *cmd,
3e1c81a9 2375 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2376 u32 length)
2377{
2378 int iov_ret, rx_got = 0, rx_size = 0;
2379 u32 checksum, iov_count = 0, padding = 0;
2380 struct iscsi_conn *conn = cmd->conn;
2381 struct kvec *iov;
2382
2383 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2384 if (iov_ret < 0)
2385 return IMMEDIATE_DATA_CANNOT_RECOVER;
2386
2387 rx_size = length;
2388 iov_count = iov_ret;
2389 iov = &cmd->iov_data[0];
2390
2391 padding = ((-length) & 3);
2392 if (padding != 0) {
2393 iov[iov_count].iov_base = cmd->pad_bytes;
2394 iov[iov_count++].iov_len = padding;
2395 rx_size += padding;
2396 }
2397
2398 if (conn->conn_ops->DataDigest) {
2399 iov[iov_count].iov_base = &checksum;
2400 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2401 rx_size += ISCSI_CRC_LEN;
2402 }
2403
2404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2405
2406 iscsit_unmap_iovec(cmd);
2407
2408 if (rx_got != rx_size) {
2409 iscsit_rx_thread_wait_for_tcp(conn);
2410 return IMMEDIATE_DATA_CANNOT_RECOVER;
2411 }
2412
2413 if (conn->conn_ops->DataDigest) {
2414 u32 data_crc;
2415
2416 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2417 cmd->write_data_done, length, padding,
2418 cmd->pad_bytes);
2419
2420 if (checksum != data_crc) {
2421 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2422 " does not match computed 0x%08x\n", checksum,
2423 data_crc);
2424
2425 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2426 pr_err("Unable to recover from"
2427 " Immediate Data digest failure while"
2428 " in ERL=0.\n");
ba159914 2429 iscsit_reject_cmd(cmd,
e48354ce 2430 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2431 (unsigned char *)hdr);
e48354ce
NB		 2432 return IMMEDIATE_DATA_CANNOT_RECOVER;
2433 } else {
ba159914 2434 iscsit_reject_cmd(cmd,
e48354ce 2435 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2436 (unsigned char *)hdr);
e48354ce
NB		 2437 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2438 }
2439 } else {
2440 pr_debug("Got CRC32C DataDigest 0x%08x for"
2441 " %u bytes of Immediate Data\n", checksum,
2442 length);
2443 }
2444 }
2445
2446 cmd->write_data_done += length;
2447
ebf1d95c 2448 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2449 spin_lock_bh(&cmd->istate_lock);
2450 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2451 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2452 spin_unlock_bh(&cmd->istate_lock);
2453 }
2454
2455 return IMMEDIATE_DATA_NORMAL_OPERATION;
2456}
2457
2458/*
2459 * Called with sess->conn_lock held.
2460 */
2461/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2462 with active network interface */
2463static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2464{
2465 struct iscsi_cmd *cmd;
2466 struct iscsi_conn *conn_p;
2467
2468 /*
2469 * Only send a Asynchronous Message on connections whos network
2470 * interface is still functional.
2471 */
2472 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2473 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2474 iscsit_inc_conn_usage_count(conn_p);
2475 break;
2476 }
2477 }
2478
2479 if (!conn_p)
2480 return;
2481
3c989d76 2482 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2483 if (!cmd) {
2484 iscsit_dec_conn_usage_count(conn_p);
2485 return;
2486 }
2487
2488 cmd->logout_cid = conn->cid;
2489 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2490 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2491
2492 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2493 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2494 spin_unlock_bh(&conn_p->cmd_lock);
2495
2496 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2497 iscsit_dec_conn_usage_count(conn_p);
2498}
2499
2500static int iscsit_send_conn_drop_async_message(
2501 struct iscsi_cmd *cmd,
2502 struct iscsi_conn *conn)
2503{
2504 struct iscsi_async *hdr;
2505
2506 cmd->tx_size = ISCSI_HDR_LEN;
2507 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2508
2509 hdr = (struct iscsi_async *) cmd->pdu;
2510 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2511 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2512 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2513 cmd->targ_xfer_tag = 0xFFFFFFFF;
2514 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2515 cmd->stat_sn = conn->stat_sn++;
2516 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2519 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2520 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2521 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2522 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2523
2524 if (conn->conn_ops->HeaderDigest) {
2525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2526
80690fdb
GU		 2527 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2528 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2529
2530 cmd->tx_size += ISCSI_CRC_LEN;
2531 pr_debug("Attaching CRC32C HeaderDigest to"
2532 " Async Message 0x%08x\n", *header_digest);
2533 }
2534
2535 cmd->iov_misc[0].iov_base = cmd->pdu;
2536 cmd->iov_misc[0].iov_len = cmd->tx_size;
2537 cmd->iov_misc_count = 1;
2538
2539 pr_debug("Sending Connection Dropped Async Message StatSN:"
2540 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2541 cmd->logout_cid, conn->cid);
2542 return 0;
2543}
2544
6f3c0e69
AG		 2545static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2546{
2547 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2548 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2549 wait_for_completion_interruptible_timeout(
2550 &conn->tx_half_close_comp,
2551 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2552 }
2553}
2554
2ec5a8c1
NB		 2555static void
2556iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2557 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2558 bool set_statsn)
e48354ce 2559{
2ec5a8c1
NB		 2560 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2561 hdr->flags = datain->flags;
2562 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2563 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2564 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2565 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2566 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2567 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2568 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2569 }
2570 }
2571 hton24(hdr->dlength, datain->length);
2572 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2573 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2574 (struct scsi_lun *)&hdr->lun);
2575 else
2576 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2577
2578 hdr->itt = cmd->init_task_tag;
2579
2580 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2581 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2582 else
2583 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2584 if (set_statsn)
2585 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2586 else
2587 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2588
2589 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2590 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2591 hdr->datasn = cpu_to_be32(datain->data_sn);
2592 hdr->offset = cpu_to_be32(datain->offset);
2593
2594 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2595 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2596 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2597 ntohl(hdr->offset), datain->length, conn->cid);
2598}
2599
2600static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2601{
2602 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2603 struct iscsi_datain datain;
2604 struct iscsi_datain_req *dr;
e48354ce 2605 struct kvec *iov;
2ec5a8c1
NB		 2606 u32 iov_count = 0, tx_size = 0;
2607 int eodr = 0, ret, iov_ret;
2608 bool set_statsn = false;
e48354ce
NB		 2609
2610 memset(&datain, 0, sizeof(struct iscsi_datain));
2611 dr = iscsit_get_datain_values(cmd, &datain);
2612 if (!dr) {
2613 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2614 cmd->init_task_tag);
2615 return -1;
2616 }
e48354ce
NB		 2617 /*
2618 * Be paranoid and double check the logic for now.
2619 */
ebf1d95c 2620 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2621 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2622 " datain.length: %u exceeds cmd->data_length: %u\n",
2623 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2624 cmd->se_cmd.data_length);
e48354ce
NB		 2625 return -1;
2626 }
2627
2628 spin_lock_bh(&conn->sess->session_stats_lock);
2629 conn->sess->tx_data_octets += datain.length;
2630 if (conn->sess->se_sess->se_node_acl) {
2631 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2632 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2633 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2634 }
2635 spin_unlock_bh(&conn->sess->session_stats_lock);
2636 /*
2637 * Special case for successfully execution w/ both DATAIN
2638 * and Sense Data.
2639 */
2640 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2641 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2642 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2643 else {
2644 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2645 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2646 iscsit_increment_maxcmdsn(cmd, conn->sess);
2647 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2648 set_statsn = true;
e48354ce 2649 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2650 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2651 set_statsn = true;
e48354ce
NB		 2652 }
2653
2ec5a8c1 2654 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2655
2656 iov = &cmd->iov_data[0];
2657 iov[iov_count].iov_base = cmd->pdu;
2658 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2659 tx_size += ISCSI_HDR_LEN;
2660
2661 if (conn->conn_ops->HeaderDigest) {
2662 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2663
80690fdb
GU		 2664 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2665 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2666
2667 iov[0].iov_len += ISCSI_CRC_LEN;
2668 tx_size += ISCSI_CRC_LEN;
2669
2670 pr_debug("Attaching CRC32 HeaderDigest"
2671 " for DataIN PDU 0x%08x\n", *header_digest);
2672 }
2673
2ec5a8c1
NB		 2674 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2675 datain.offset, datain.length);
e48354ce
NB		 2676 if (iov_ret < 0)
2677 return -1;
2678
2679 iov_count += iov_ret;
2680 tx_size += datain.length;
2681
2682 cmd->padding = ((-datain.length) & 3);
2683 if (cmd->padding) {
2684 iov[iov_count].iov_base = cmd->pad_bytes;
2685 iov[iov_count++].iov_len = cmd->padding;
2686 tx_size += cmd->padding;
2687
2688 pr_debug("Attaching %u padding bytes\n",
2689 cmd->padding);
2690 }
2691 if (conn->conn_ops->DataDigest) {
2692 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2693 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2694
2695 iov[iov_count].iov_base = &cmd->data_crc;
2696 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2697 tx_size += ISCSI_CRC_LEN;
2698
2699 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2700 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2701 }
2702
2703 cmd->iov_data_count = iov_count;
2704 cmd->tx_size = tx_size;
2705
6f3c0e69
AG		 2706 /* sendpage is preferred but can't insert markers */
2707 if (!conn->conn_ops->IFMarker)
2708 ret = iscsit_fe_sendpage_sg(cmd, conn);
2709 else
2710 ret = iscsit_send_tx_data(cmd, conn, 0);
2711
2712 iscsit_unmap_iovec(cmd);
2713
2714 if (ret < 0) {
2715 iscsit_tx_thread_wait_for_tcp(conn);
2716 return ret;
2717 }
2718
e48354ce 2719 if (dr->dr_complete) {
6f3c0e69 2720 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2721 2 : 1;
2722 iscsit_free_datain_req(cmd, dr);
2723 }
2724
6f3c0e69 2725 return eodr;
e48354ce
NB		 2726}
2727
2ec5a8c1
NB		 2728int
2729iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2730 struct iscsi_logout_rsp *hdr)
e48354ce 2731{
e48354ce
NB		 2732 struct iscsi_conn *logout_conn = NULL;
2733 struct iscsi_conn_recovery *cr = NULL;
2734 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2735 /*
2736 * The actual shutting down of Sessions and/or Connections
2737 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2738 * is done in scsi_logout_post_handler().
2739 */
2740 switch (cmd->logout_reason) {
2741 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2742 pr_debug("iSCSI session logout successful, setting"
2743 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2744 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2745 break;
2746 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2747 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2748 break;
2749 /*
2750 * For CLOSECONNECTION logout requests carrying
2751 * a matching logout CID -> local CID, the reference
2752 * for the local CID will have been incremented in
2753 * iscsi_logout_closeconnection().
2754 *
2755 * For CLOSECONNECTION logout requests carrying
2756 * a different CID than the connection it arrived
2757 * on, the connection responding to cmd->logout_cid
2758 * is stopped in iscsit_logout_post_handler_diffcid().
2759 */
2760
2761 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2762 " successful.\n", cmd->logout_cid, conn->cid);
2763 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2764 break;
2765 case ISCSI_LOGOUT_REASON_RECOVERY:
2766 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2767 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2768 break;
2769 /*
2770 * If the connection is still active from our point of view
2771 * force connection recovery to occur.
2772 */
2773 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2774 cmd->logout_cid);
ee1b1b9c 2775 if (logout_conn) {
e48354ce
NB		 2776 iscsit_connection_reinstatement_rcfr(logout_conn);
2777 iscsit_dec_conn_usage_count(logout_conn);
2778 }
2779
2780 cr = iscsit_get_inactive_connection_recovery_entry(
2781 conn->sess, cmd->logout_cid);
2782 if (!cr) {
2783 pr_err("Unable to locate CID: %hu for"
2784 " REMOVECONNFORRECOVERY Logout Request.\n",
2785 cmd->logout_cid);
2786 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2787 break;
2788 }
2789
2790 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2791
2792 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2793 " for recovery for CID: %hu on CID: %hu successful.\n",
2794 cmd->logout_cid, conn->cid);
2795 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2796 break;
2797 default:
2798 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2799 cmd->logout_reason);
2800 return -1;
2801 }
2802
e48354ce
NB		 2803 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2804 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2805 hdr->response = cmd->logout_response;
66c7db68 2806 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2807 cmd->stat_sn = conn->stat_sn++;
2808 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2809
2810 iscsit_increment_maxcmdsn(cmd, conn->sess);
2811 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2812 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2813
2ec5a8c1
NB		 2814 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2815 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2816 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2817 cmd->logout_cid, conn->cid);
2818
2819 return 0;
2820}
2821EXPORT_SYMBOL(iscsit_build_logout_rsp);
2822
2823static int
2824iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2825{
2826 struct kvec *iov;
2827 int niov = 0, tx_size, rc;
2828
2829 rc = iscsit_build_logout_rsp(cmd, conn,
2830 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2831 if (rc < 0)
2832 return rc;
2833
2834 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2835 iov = &cmd->iov_misc[0];
2836 iov[niov].iov_base = cmd->pdu;
2837 iov[niov++].iov_len = ISCSI_HDR_LEN;
2838
2839 if (conn->conn_ops->HeaderDigest) {
2840 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2841
80690fdb
GU		 2842 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2843 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2844
2845 iov[0].iov_len += ISCSI_CRC_LEN;
2846 tx_size += ISCSI_CRC_LEN;
2847 pr_debug("Attaching CRC32C HeaderDigest to"
2848 " Logout Response 0x%08x\n", *header_digest);
2849 }
2850 cmd->iov_misc_count = niov;
2851 cmd->tx_size = tx_size;
2852
e48354ce
NB		 2853 return 0;
2854}
2855
2ec5a8c1
NB		 2856void
2857iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2858 struct iscsi_nopin *hdr, bool nopout_response)
2859{
2860 hdr->opcode = ISCSI_OP_NOOP_IN;
2861 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2862 hton24(hdr->dlength, cmd->buf_ptr_size);
2863 if (nopout_response)
2864 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2865 hdr->itt = cmd->init_task_tag;
2866 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2867 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2868 conn->stat_sn;
2869 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2870
2871 if (nopout_response)
2872 iscsit_increment_maxcmdsn(cmd, conn->sess);
2873
2874 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2875 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2876
2877 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2878 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2879 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2880 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2881}
2882EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2883
e48354ce
NB		 2884/*
2885 * Unsolicited NOPIN, either requesting a response or not.
2886 */
2887static int iscsit_send_unsolicited_nopin(
2888 struct iscsi_cmd *cmd,
2889 struct iscsi_conn *conn,
2890 int want_response)
2891{
2ec5a8c1
NB		 2892 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2893 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2894
2ec5a8c1 2895 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2896
2897 if (conn->conn_ops->HeaderDigest) {
2898 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2899
80690fdb
GU		 2900 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2901 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2902
2903 tx_size += ISCSI_CRC_LEN;
2904 pr_debug("Attaching CRC32C HeaderDigest to"
2905 " NopIN 0x%08x\n", *header_digest);
2906 }
2907
2908 cmd->iov_misc[0].iov_base = cmd->pdu;
2909 cmd->iov_misc[0].iov_len = tx_size;
2910 cmd->iov_misc_count = 1;
2911 cmd->tx_size = tx_size;
2912
2913 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2914 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2915
6f3c0e69
AG		 2916 ret = iscsit_send_tx_data(cmd, conn, 1);
2917 if (ret < 0) {
2918 iscsit_tx_thread_wait_for_tcp(conn);
2919 return ret;
2920 }
2921
2922 spin_lock_bh(&cmd->istate_lock);
2923 cmd->i_state = want_response ?
2924 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2925 spin_unlock_bh(&cmd->istate_lock);
2926
e48354ce
NB		 2927 return 0;
2928}
2929
2ec5a8c1
NB		 2930static int
2931iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2932{
2ec5a8c1 2933 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2934 struct kvec *iov;
2ec5a8c1
NB		 2935 u32 padding = 0;
2936 int niov = 0, tx_size;
e48354ce 2937
2ec5a8c1 2938 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2939
2ec5a8c1 2940 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2941 iov = &cmd->iov_misc[0];
2942 iov[niov].iov_base = cmd->pdu;
2943 iov[niov++].iov_len = ISCSI_HDR_LEN;
2944
2945 if (conn->conn_ops->HeaderDigest) {
2946 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2947
80690fdb
GU		 2948 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2949 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2950
2951 iov[0].iov_len += ISCSI_CRC_LEN;
2952 tx_size += ISCSI_CRC_LEN;
2953 pr_debug("Attaching CRC32C HeaderDigest"
2954 " to NopIn 0x%08x\n", *header_digest);
2955 }
2956
2957 /*
2958 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2959 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2960 */
2961 if (cmd->buf_ptr_size) {
2962 iov[niov].iov_base = cmd->buf_ptr;
2963 iov[niov++].iov_len = cmd->buf_ptr_size;
2964 tx_size += cmd->buf_ptr_size;
2965
2966 pr_debug("Echoing back %u bytes of ping"
2967 " data.\n", cmd->buf_ptr_size);
2968
2969 padding = ((-cmd->buf_ptr_size) & 3);
2970 if (padding != 0) {
2971 iov[niov].iov_base = &cmd->pad_bytes;
2972 iov[niov++].iov_len = padding;
2973 tx_size += padding;
2974 pr_debug("Attaching %u additional"
2975 " padding bytes.\n", padding);
2976 }
2977 if (conn->conn_ops->DataDigest) {
2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2979 cmd->buf_ptr, cmd->buf_ptr_size,
2980 padding, (u8 *)&cmd->pad_bytes,
2981 (u8 *)&cmd->data_crc);
2982
2983 iov[niov].iov_base = &cmd->data_crc;
2984 iov[niov++].iov_len = ISCSI_CRC_LEN;
2985 tx_size += ISCSI_CRC_LEN;
2986 pr_debug("Attached DataDigest for %u"
2987 " bytes of ping data, CRC 0x%08x\n",
2988 cmd->buf_ptr_size, cmd->data_crc);
2989 }
2990 }
2991
2992 cmd->iov_misc_count = niov;
2993 cmd->tx_size = tx_size;
2994
e48354ce
NB		 2995 return 0;
2996}
2997
6f3c0e69 2998static int iscsit_send_r2t(
e48354ce
NB		 2999 struct iscsi_cmd *cmd,
3000 struct iscsi_conn *conn)
3001{
3002 int tx_size = 0;
3003 struct iscsi_r2t *r2t;
3004 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3005 int ret;
e48354ce
NB		 3006
3007 r2t = iscsit_get_r2t_from_list(cmd);
3008 if (!r2t)
3009 return -1;
3010
3011 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3012 memset(hdr, 0, ISCSI_HDR_LEN);
3013 hdr->opcode = ISCSI_OP_R2T;
3014 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3015 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3016 (struct scsi_lun *)&hdr->lun);
66c7db68 3017 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3018 spin_lock_bh(&conn->sess->ttt_lock);
3019 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3020 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3021 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3022 spin_unlock_bh(&conn->sess->ttt_lock);
3023 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3024 hdr->statsn = cpu_to_be32(conn->stat_sn);
3025 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3026 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3027 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3028 hdr->data_offset = cpu_to_be32(r2t->offset);
3029 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3030
3031 cmd->iov_misc[0].iov_base = cmd->pdu;
3032 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3033 tx_size += ISCSI_HDR_LEN;
3034
3035 if (conn->conn_ops->HeaderDigest) {
3036 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3037
80690fdb
GU		 3038 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3039 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3040
3041 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3042 tx_size += ISCSI_CRC_LEN;
3043 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3044 " PDU 0x%08x\n", *header_digest);
3045 }
3046
3047 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3048 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3049 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3050 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3051 r2t->offset, r2t->xfer_len, conn->cid);
3052
3053 cmd->iov_misc_count = 1;
3054 cmd->tx_size = tx_size;
3055
3056 spin_lock_bh(&cmd->r2t_lock);
3057 r2t->sent_r2t = 1;
3058 spin_unlock_bh(&cmd->r2t_lock);
3059
6f3c0e69
AG		 3060 ret = iscsit_send_tx_data(cmd, conn, 1);
3061 if (ret < 0) {
3062 iscsit_tx_thread_wait_for_tcp(conn);
3063 return ret;
3064 }
3065
3066 spin_lock_bh(&cmd->dataout_timeout_lock);
3067 iscsit_start_dataout_timer(cmd, conn);
3068 spin_unlock_bh(&cmd->dataout_timeout_lock);
3069
e48354ce
NB		 3070 return 0;
3071}
3072
3073/*
8b1e1244
AG		 3074 * @recovery: If called from iscsi_task_reassign_complete_write() for
3075 * connection recovery.
e48354ce
NB		 3076 */
3077int iscsit_build_r2ts_for_cmd(
e48354ce 3078 struct iscsi_conn *conn,
3e1c81a9 3079 struct iscsi_cmd *cmd,
8b1e1244 3080 bool recovery)
e48354ce
NB		 3081{
3082 int first_r2t = 1;
3083 u32 offset = 0, xfer_len = 0;
3084
3085 spin_lock_bh(&cmd->r2t_lock);
3086 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3087 spin_unlock_bh(&cmd->r2t_lock);
3088 return 0;
3089 }
3090
8b1e1244
AG		 3091 if (conn->sess->sess_ops->DataSequenceInOrder &&
3092 !recovery)
c6037cc5 3093 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3094
3095 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3096 if (conn->sess->sess_ops->DataSequenceInOrder) {
3097 offset = cmd->r2t_offset;
3098
8b1e1244
AG		 3099 if (first_r2t && recovery) {
3100 int new_data_end = offset +
3101 conn->sess->sess_ops->MaxBurstLength -
3102 cmd->next_burst_len;
3103
ebf1d95c
AG		 3104 if (new_data_end > cmd->se_cmd.data_length)
3105 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3106 else
3107 xfer_len =
3108 conn->sess->sess_ops->MaxBurstLength -
3109 cmd->next_burst_len;
e48354ce 3110 } else {
8b1e1244
AG		 3111 int new_data_end = offset +
3112 conn->sess->sess_ops->MaxBurstLength;
3113
ebf1d95c
AG		 3114 if (new_data_end > cmd->se_cmd.data_length)
3115 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3116 else
3117 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3118 }
3119 cmd->r2t_offset += xfer_len;
3120
ebf1d95c 3121 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3122 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3123 } else {
3124 struct iscsi_seq *seq;
3125
3126 seq = iscsit_get_seq_holder_for_r2t(cmd);
3127 if (!seq) {
3128 spin_unlock_bh(&cmd->r2t_lock);
3129 return -1;
3130 }
3131
3132 offset = seq->offset;
3133 xfer_len = seq->xfer_len;
3134
3135 if (cmd->seq_send_order == cmd->seq_count)
3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137 }
3138 cmd->outstanding_r2ts++;
3139 first_r2t = 0;
3140
3141 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3142 spin_unlock_bh(&cmd->r2t_lock);
3143 return -1;
3144 }
3145
3146 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3147 break;
3148 }
3149 spin_unlock_bh(&cmd->r2t_lock);
3150
3151 return 0;
3152}
3153
2ec5a8c1
NB		 3154void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3155 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3156{
2ec5a8c1 3157 if (inc_stat_sn)
e48354ce
NB		 3158 cmd->stat_sn = conn->stat_sn++;
3159
3160 spin_lock_bh(&conn->sess->session_stats_lock);
3161 conn->sess->rsp_pdus++;
3162 spin_unlock_bh(&conn->sess->session_stats_lock);
3163
e48354ce
NB		 3164 memset(hdr, 0, ISCSI_HDR_LEN);
3165 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3166 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3167 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3168 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3169 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3170 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3171 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3172 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3173 }
3174 hdr->response = cmd->iscsi_response;
3175 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3176 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3177 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3178
3179 iscsit_increment_maxcmdsn(cmd, conn->sess);
3180 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3181 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3182
2ec5a8c1
NB		 3183 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3184 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3185 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3186 cmd->se_cmd.scsi_status, conn->cid);
3187}
3188EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3189
3190static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3191{
3192 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3193 struct kvec *iov;
3194 u32 padding = 0, tx_size = 0;
3195 int iov_count = 0;
3196 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3197
3198 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3199
e48354ce
NB		 3200 iov = &cmd->iov_misc[0];
3201 iov[iov_count].iov_base = cmd->pdu;
3202 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3203 tx_size += ISCSI_HDR_LEN;
3204
3205 /*
3206 * Attach SENSE DATA payload to iSCSI Response PDU
3207 */
3208 if (cmd->se_cmd.sense_buffer &&
3209 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3210 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3211 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3212 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3213
e48354ce 3214 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3215 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3216 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3217 iov[iov_count++].iov_len =
3218 (cmd->se_cmd.scsi_sense_length + padding);
3219 tx_size += cmd->se_cmd.scsi_sense_length;
3220
3221 if (padding) {
9c58b7dd 3222 memset(cmd->sense_buffer +
e48354ce
NB		 3223 cmd->se_cmd.scsi_sense_length, 0, padding);
3224 tx_size += padding;
3225 pr_debug("Adding %u bytes of padding to"
3226 " SENSE.\n", padding);
3227 }
3228
3229 if (conn->conn_ops->DataDigest) {
3230 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3231 cmd->sense_buffer,
e48354ce
NB		 3232 (cmd->se_cmd.scsi_sense_length + padding),
3233 0, NULL, (u8 *)&cmd->data_crc);
3234
3235 iov[iov_count].iov_base = &cmd->data_crc;
3236 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3237 tx_size += ISCSI_CRC_LEN;
3238
3239 pr_debug("Attaching CRC32 DataDigest for"
3240 " SENSE, %u bytes CRC 0x%08x\n",
3241 (cmd->se_cmd.scsi_sense_length + padding),
3242 cmd->data_crc);
3243 }
3244
3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3246 " Response PDU\n",
3247 cmd->se_cmd.scsi_sense_length);
3248 }
3249
3250 if (conn->conn_ops->HeaderDigest) {
3251 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3252
80690fdb
GU		 3253 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3254 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3255
3256 iov[0].iov_len += ISCSI_CRC_LEN;
3257 tx_size += ISCSI_CRC_LEN;
3258 pr_debug("Attaching CRC32 HeaderDigest for Response"
3259 " PDU 0x%08x\n", *header_digest);
3260 }
3261
3262 cmd->iov_misc_count = iov_count;
3263 cmd->tx_size = tx_size;
3264
e48354ce
NB		 3265 return 0;
3266}
3267
3268static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3269{
3270 switch (se_tmr->response) {
3271 case TMR_FUNCTION_COMPLETE:
3272 return ISCSI_TMF_RSP_COMPLETE;
3273 case TMR_TASK_DOES_NOT_EXIST:
3274 return ISCSI_TMF_RSP_NO_TASK;
3275 case TMR_LUN_DOES_NOT_EXIST:
3276 return ISCSI_TMF_RSP_NO_LUN;
3277 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3278 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 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 */
6665889c 3373 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
e48354ce 3374
8b1e1244
AG		 3375 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3376 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3377
3378 payload = kzalloc(buffer_len, GFP_KERNEL);
3379 if (!payload) {
3380 pr_err("Unable to allocate memory for sendtargets"
3381 " response.\n");
3382 return -ENOMEM;
3383 }
6665889c
NB		 3384 /*
3385 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3386 * explicit case..
3387 */
3388 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3389 text_ptr = strchr(text_in, '=');
3390 if (!text_ptr) {
3391 pr_err("Unable to locate '=' string in text_in:"
3392 " %s\n", text_in);
4f45d320 3393 kfree(payload);
6665889c
NB		 3394 return -EINVAL;
3395 }
3396 /*
3397 * Skip over '=' character..
3398 */
3399 text_ptr += 1;
3400 }
e48354ce
NB		 3401
3402 spin_lock(&tiqn_lock);
3403 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
6665889c
NB		 3404 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3405 strcmp(tiqn->tiqn, text_ptr)) {
3406 continue;
3407 }
3408
e48354ce
NB		 3409 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3410 len += 1;
3411
3412 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3413 end_of_buf = 1;
3414 goto eob;
3415 }
8359cf43 3416 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3417 payload_len += len;
3418
3419 spin_lock(&tiqn->tiqn_tpg_lock);
3420 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3421
3422 spin_lock(&tpg->tpg_state_lock);
3423 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3424 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3425 spin_unlock(&tpg->tpg_state_lock);
3426 continue;
3427 }
3428 spin_unlock(&tpg->tpg_state_lock);
3429
3430 spin_lock(&tpg->tpg_np_lock);
3431 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3432 tpg_np_list) {
2f9bc894
NB		 3433 struct iscsi_np *np = tpg_np->tpg_np;
3434 bool inaddr_any = iscsit_check_inaddr_any(np);
3435
e48354ce 3436 len = sprintf(buf, "TargetAddress="
dfecf611
CL		 3437 "%s:%hu,%hu",
3438 (inaddr_any == false) ?
2f9bc894 3439 np->np_ip : conn->local_ip,
dfecf611 3440 (inaddr_any == false) ?
2f9bc894 3441 np->np_port : conn->local_port,
e48354ce
NB		 3442 tpg->tpgt);
3443 len += 1;
3444
3445 if ((len + payload_len) > buffer_len) {
3446 spin_unlock(&tpg->tpg_np_lock);
3447 spin_unlock(&tiqn->tiqn_tpg_lock);
3448 end_of_buf = 1;
3449 goto eob;
3450 }
8359cf43 3451 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3452 payload_len += len;
3453 }
3454 spin_unlock(&tpg->tpg_np_lock);
3455 }
3456 spin_unlock(&tiqn->tiqn_tpg_lock);
3457eob:
3458 if (end_of_buf)
3459 break;
6665889c
NB		 3460
3461 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3462 break;
e48354ce
NB		 3463 }
3464 spin_unlock(&tiqn_lock);
3465
3466 cmd->buf_ptr = payload;
3467
3468 return payload_len;
3469}
3470
889c8a68
NB		 3471int
3472iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3473 struct iscsi_text_rsp *hdr)
e48354ce 3474{
889c8a68 3475 int text_length, padding;
e48354ce
NB		 3476
3477 text_length = iscsit_build_sendtargets_response(cmd);
3478 if (text_length < 0)
3479 return text_length;
3480
889c8a68
NB		 3481 hdr->opcode = ISCSI_OP_TEXT_RSP;
3482 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
e48354ce 3483 padding = ((-text_length) & 3);
e48354ce 3484 hton24(hdr->dlength, text_length);
889c8a68
NB		 3485 hdr->itt = cmd->init_task_tag;
3486 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3487 cmd->stat_sn = conn->stat_sn++;
3488 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3489
3490 iscsit_increment_maxcmdsn(cmd, conn->sess);
889c8a68
NB		 3491 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3492 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
e48354ce 3493
889c8a68
NB		 3494 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3495 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3496 text_length, conn->cid);
3497
3498 return text_length + padding;
3499}
3500EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3501
889c8a68
NB		 3502/*
3503 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3504 * MaxRecvDataSegmentLength.
3505 */
3506static int iscsit_send_text_rsp(
3507 struct iscsi_cmd *cmd,
3508 struct iscsi_conn *conn)
3509{
3510 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3511 struct kvec *iov;
3512 u32 tx_size = 0;
3513 int text_length, iov_count = 0, rc;
3514
3515 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3516 if (rc < 0)
3517 return rc;
3518
3519 text_length = rc;
3520 iov = &cmd->iov_misc[0];
e48354ce
NB		 3521 iov[iov_count].iov_base = cmd->pdu;
3522 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3523 iov[iov_count].iov_base = cmd->buf_ptr;
889c8a68 3524 iov[iov_count++].iov_len = text_length;
e48354ce 3525
889c8a68 3526 tx_size += (ISCSI_HDR_LEN + text_length);
e48354ce
NB		 3527
3528 if (conn->conn_ops->HeaderDigest) {
3529 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3530
80690fdb
GU		 3531 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3532 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3533
3534 iov[0].iov_len += ISCSI_CRC_LEN;
3535 tx_size += ISCSI_CRC_LEN;
3536 pr_debug("Attaching CRC32 HeaderDigest for"
3537 " Text Response PDU 0x%08x\n", *header_digest);
3538 }
3539
3540 if (conn->conn_ops->DataDigest) {
3541 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
889c8a68 3542 cmd->buf_ptr, text_length,
e48354ce
NB		 3543 0, NULL, (u8 *)&cmd->data_crc);
3544
3545 iov[iov_count].iov_base = &cmd->data_crc;
3546 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3547 tx_size += ISCSI_CRC_LEN;
3548
3549 pr_debug("Attaching DataDigest for %u bytes of text"
889c8a68 3550 " data, CRC 0x%08x\n", text_length,
e48354ce
NB		 3551 cmd->data_crc);
3552 }
3553
3554 cmd->iov_misc_count = iov_count;
3555 cmd->tx_size = tx_size;
3556
e48354ce
NB		 3557 return 0;
3558}
3559
2ec5a8c1
NB		 3560void
3561iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3562 struct iscsi_reject *hdr)
3563{
3564 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3565 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3566 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3567 hton24(hdr->dlength, ISCSI_HDR_LEN);
3568 hdr->ffffffff = cpu_to_be32(0xffffffff);
3569 cmd->stat_sn = conn->stat_sn++;
3570 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3571 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3572 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3573
3574}
3575EXPORT_SYMBOL(iscsit_build_reject);
3576
e48354ce
NB		 3577static int iscsit_send_reject(
3578 struct iscsi_cmd *cmd,
3579 struct iscsi_conn *conn)
3580{
bfbdb31d 3581 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3582 struct kvec *iov;
bfbdb31d 3583 u32 iov_count = 0, tx_size;
e48354ce 3584
bfbdb31d 3585 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3586
3587 iov = &cmd->iov_misc[0];
e48354ce
NB		 3588 iov[iov_count].iov_base = cmd->pdu;
3589 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3590 iov[iov_count].iov_base = cmd->buf_ptr;
3591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3592
3593 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3594
3595 if (conn->conn_ops->HeaderDigest) {
3596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3597
80690fdb
GU		 3598 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3599 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3600
3601 iov[0].iov_len += ISCSI_CRC_LEN;
3602 tx_size += ISCSI_CRC_LEN;
3603 pr_debug("Attaching CRC32 HeaderDigest for"
3604 " REJECT PDU 0x%08x\n", *header_digest);
3605 }
3606
3607 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3608 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3609 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3610
3611 iov[iov_count].iov_base = &cmd->data_crc;
3612 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3613 tx_size += ISCSI_CRC_LEN;
3614 pr_debug("Attaching CRC32 DataDigest for REJECT"
3615 " PDU 0x%08x\n", cmd->data_crc);
3616 }
3617
3618 cmd->iov_misc_count = iov_count;
3619 cmd->tx_size = tx_size;
3620
3621 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3622 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3623
3624 return 0;
3625}
3626
e48354ce
NB		 3627void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3628{
3629 struct iscsi_thread_set *ts = conn->thread_set;
3630 int ord, cpu;
3631 /*
3632 * thread_id is assigned from iscsit_global->ts_bitmap from
3633 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3634 *
3635 * Here we use thread_id to determine which CPU that this
3636 * iSCSI connection's iscsi_thread_set will be scheduled to
3637 * execute upon.
3638 */
3639 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3640 for_each_online_cpu(cpu) {
3641 if (ord-- == 0) {
3642 cpumask_set_cpu(cpu, conn->conn_cpumask);
3643 return;
3644 }
3645 }
3646 /*
3647 * This should never be reached..
3648 */
3649 dump_stack();
3650 cpumask_setall(conn->conn_cpumask);
3651}
3652
3653static inline void iscsit_thread_check_cpumask(
3654 struct iscsi_conn *conn,
3655 struct task_struct *p,
3656 int mode)
3657{
3658 char buf[128];
3659 /*
3660 * mode == 1 signals iscsi_target_tx_thread() usage.
3661 * mode == 0 signals iscsi_target_rx_thread() usage.
3662 */
3663 if (mode == 1) {
3664 if (!conn->conn_tx_reset_cpumask)
3665 return;
3666 conn->conn_tx_reset_cpumask = 0;
3667 } else {
3668 if (!conn->conn_rx_reset_cpumask)
3669 return;
3670 conn->conn_rx_reset_cpumask = 0;
3671 }
3672 /*
3673 * Update the CPU mask for this single kthread so that
3674 * both TX and RX kthreads are scheduled to run on the
3675 * same CPU.
3676 */
3677 memset(buf, 0, 128);
3678 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3679 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3680}
3681
2ec5a8c1
NB		 3682static int
3683iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3684{
6f3c0e69
AG		 3685 int ret;
3686
2ec5a8c1
NB		 3687 switch (state) {
3688 case ISTATE_SEND_R2T:
3689 ret = iscsit_send_r2t(cmd, conn);
3690 if (ret < 0)
3691 goto err;
3692 break;
3693 case ISTATE_REMOVE:
3694 spin_lock_bh(&conn->cmd_lock);
3695 list_del(&cmd->i_conn_node);
3696 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3697
aafc9d15 3698 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3699 break;
3700 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3701 iscsit_mod_nopin_response_timer(conn);
3702 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3703 if (ret < 0)
6f3c0e69 3704 goto err;
2ec5a8c1
NB		 3705 break;
3706 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3707 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3708 if (ret < 0)
3709 goto err;
3710 break;
3711 default:
3712 pr_err("Unknown Opcode: 0x%02x ITT:"
3713 " 0x%08x, i_state: %d on CID: %hu\n",
3714 cmd->iscsi_opcode, cmd->init_task_tag, state,
3715 conn->cid);
3716 goto err;
6f3c0e69
AG		 3717 }
3718
3719 return 0;
3720
3721err:
3722 return -1;
3723}
3724
2ec5a8c1
NB		 3725static int
3726iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3727{
2ec5a8c1 3728 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3729 struct iscsi_queue_req *qr;
3730 struct iscsi_cmd *cmd;
3731 u8 state;
3732 int ret;
3733
2ec5a8c1
NB		 3734 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3735 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3736 cmd = qr->cmd;
3737 state = qr->state;
3738 kmem_cache_free(lio_qr_cache, qr);
3739
2ec5a8c1
NB		 3740 ret = t->iscsit_immediate_queue(conn, cmd, state);
3741 if (ret < 0)
3742 return ret;
3743 }
fd3a9025 3744
2ec5a8c1
NB		 3745 return 0;
3746}
6f3c0e69 3747
2ec5a8c1
NB		 3748static int
3749iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3750{
3751 int ret;
3752
3753check_rsp_state:
3754 switch (state) {
3755 case ISTATE_SEND_DATAIN:
3756 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3757 if (ret < 0)
3758 goto err;
2ec5a8c1
NB		 3759 else if (!ret)
3760 /* more drs */
3761 goto check_rsp_state;
3762 else if (ret == 1) {
3763 /* all done */
3764 spin_lock_bh(&cmd->istate_lock);
3765 cmd->i_state = ISTATE_SENT_STATUS;
3766 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3767
2ec5a8c1
NB		 3768 if (atomic_read(&conn->check_immediate_queue))
3769 return 1;
6f3c0e69 3770
2ec5a8c1
NB		 3771 return 0;
3772 } else if (ret == 2) {
3773 /* Still must send status,
3774 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3775 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3776 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3777 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3778 state = ISTATE_SEND_STATUS;
3779 goto check_rsp_state;
3780 }
3781
3782 break;
3783 case ISTATE_SEND_STATUS:
3784 case ISTATE_SEND_STATUS_RECOVERY:
3785 ret = iscsit_send_response(cmd, conn);
3786 break;
3787 case ISTATE_SEND_LOGOUTRSP:
3788 ret = iscsit_send_logout(cmd, conn);
3789 break;
3790 case ISTATE_SEND_ASYNCMSG:
3791 ret = iscsit_send_conn_drop_async_message(
3792 cmd, conn);
3793 break;
3794 case ISTATE_SEND_NOPIN:
3795 ret = iscsit_send_nopin(cmd, conn);
3796 break;
3797 case ISTATE_SEND_REJECT:
3798 ret = iscsit_send_reject(cmd, conn);
3799 break;
3800 case ISTATE_SEND_TASKMGTRSP:
3801 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3802 if (ret != 0)
6f3c0e69 3803 break;
2ec5a8c1
NB		 3804 ret = iscsit_tmr_post_handler(cmd, conn);
3805 if (ret != 0)
3806 iscsit_fall_back_to_erl0(conn->sess);
3807 break;
3808 case ISTATE_SEND_TEXTRSP:
3809 ret = iscsit_send_text_rsp(cmd, conn);
3810 break;
3811 default:
3812 pr_err("Unknown Opcode: 0x%02x ITT:"
3813 " 0x%08x, i_state: %d on CID: %hu\n",
3814 cmd->iscsi_opcode, cmd->init_task_tag,
3815 state, conn->cid);
3816 goto err;
3817 }
3818 if (ret < 0)
3819 goto err;
3820
3821 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3822 iscsit_tx_thread_wait_for_tcp(conn);
3823 iscsit_unmap_iovec(cmd);
3824 goto err;
3825 }
3826 iscsit_unmap_iovec(cmd);
3827
3828 switch (state) {
3829 case ISTATE_SEND_LOGOUTRSP:
3830 if (!iscsit_logout_post_handler(cmd, conn))
3831 goto restart;
3832 /* fall through */
3833 case ISTATE_SEND_STATUS:
3834 case ISTATE_SEND_ASYNCMSG:
3835 case ISTATE_SEND_NOPIN:
3836 case ISTATE_SEND_STATUS_RECOVERY:
3837 case ISTATE_SEND_TEXTRSP:
3838 case ISTATE_SEND_TASKMGTRSP:
ba159914 3839 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3840 spin_lock_bh(&cmd->istate_lock);
3841 cmd->i_state = ISTATE_SENT_STATUS;
3842 spin_unlock_bh(&cmd->istate_lock);
3843 break;
2ec5a8c1
NB		 3844 default:
3845 pr_err("Unknown Opcode: 0x%02x ITT:"
3846 " 0x%08x, i_state: %d on CID: %hu\n",
3847 cmd->iscsi_opcode, cmd->init_task_tag,
3848 cmd->i_state, conn->cid);
3849 goto err;
6f3c0e69
AG		 3850 }
3851
2ec5a8c1
NB		 3852 if (atomic_read(&conn->check_immediate_queue))
3853 return 1;
3854
6f3c0e69
AG		 3855 return 0;
3856
3857err:
3858 return -1;
3859restart:
3860 return -EAGAIN;
3861}
3862
2ec5a8c1
NB		 3863static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3864{
3865 struct iscsit_transport *t = conn->conn_transport;
3866 struct iscsi_queue_req *qr;
3867 struct iscsi_cmd *cmd;
3868 u8 state;
3869 int ret;
3870
3871 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3872 cmd = qr->cmd;
3873 state = qr->state;
3874 kmem_cache_free(lio_qr_cache, qr);
3875
3876 ret = t->iscsit_response_queue(conn, cmd, state);
3877 if (ret == 1 || ret < 0)
3878 return ret;
3879 }
3880
3881 return 0;
3882}
3883
6f3c0e69
AG		 3884int iscsi_target_tx_thread(void *arg)
3885{
e48354ce 3886 int ret = 0;
e48354ce 3887 struct iscsi_conn *conn;
8359cf43 3888 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3889 /*
3890 * Allow ourselves to be interrupted by SIGINT so that a
3891 * connection recovery / failure event can be triggered externally.
3892 */
3893 allow_signal(SIGINT);
3894
3895restart:
3896 conn = iscsi_tx_thread_pre_handler(ts);
3897 if (!conn)
3898 goto out;
3899
6f3c0e69 3900 ret = 0;
e48354ce
NB		 3901
3902 while (!kthread_should_stop()) {
3903 /*
3904 * Ensure that both TX and RX per connection kthreads
3905 * are scheduled to run on the same CPU.
3906 */
3907 iscsit_thread_check_cpumask(conn, current, 1);
3908
d5627acb
RD		 3909 wait_event_interruptible(conn->queues_wq,
3910 !iscsit_conn_all_queues_empty(conn) ||
3911 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3912
3913 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3914 signal_pending(current))
3915 goto transport_err;
3916
fd3a9025 3917get_immediate:
2ec5a8c1 3918 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3919 if (ret < 0)
3920 goto transport_err;
e48354ce 3921
2ec5a8c1 3922 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3923 if (ret == 1)
3924 goto get_immediate;
3925 else if (ret == -EAGAIN)
6f3c0e69
AG		 3926 goto restart;
3927 else if (ret < 0)
3928 goto transport_err;
e48354ce
NB		 3929 }
3930
3931transport_err:
3932 iscsit_take_action_for_connection_exit(conn);
3933 goto restart;
3934out:
3935 return 0;
3936}
3937
3e1c81a9
NB		 3938static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3939{
3940 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3941 struct iscsi_cmd *cmd;
3942 int ret = 0;
3943
3944 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3945 case ISCSI_OP_SCSI_CMD:
3946 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3947 if (!cmd)
ba159914 3948 goto reject;
3e1c81a9
NB		 3949
3950 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3951 break;
3952 case ISCSI_OP_SCSI_DATA_OUT:
3953 ret = iscsit_handle_data_out(conn, buf);
3954 break;
3955 case ISCSI_OP_NOOP_OUT:
3956 cmd = NULL;
3957 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3958 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3959 if (!cmd)
ba159914 3960 goto reject;
3e1c81a9
NB		 3961 }
3962 ret = iscsit_handle_nop_out(conn, cmd, buf);
3963 break;
3964 case ISCSI_OP_SCSI_TMFUNC:
3965 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3966 if (!cmd)
ba159914 3967 goto reject;
3e1c81a9
NB		 3968
3969 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3970 break;
3971 case ISCSI_OP_TEXT:
64534aa7
NB		 3972 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3973 if (!cmd)
ba159914 3974 goto reject;
64534aa7
NB		 3975
3976 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 3977 break;
3978 case ISCSI_OP_LOGOUT:
3979 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3980 if (!cmd)
ba159914 3981 goto reject;
3e1c81a9
NB		 3982
3983 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3984 if (ret > 0)
3985 wait_for_completion_timeout(&conn->conn_logout_comp,
3986 SECONDS_FOR_LOGOUT_COMP * HZ);
3987 break;
3988 case ISCSI_OP_SNACK:
3989 ret = iscsit_handle_snack(conn, buf);
3990 break;
3991 default:
3992 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3993 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3994 pr_err("Cannot recover from unknown"
3995 " opcode while ERL=0, closing iSCSI connection.\n");
3996 return -1;
3997 }
3998 if (!conn->conn_ops->OFMarker) {
3999 pr_err("Unable to recover from unknown"
4000 " opcode while OFMarker=No, closing iSCSI"
4001 " connection.\n");
4002 return -1;
4003 }
4004 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4005 pr_err("Unable to recover from unknown"
4006 " opcode, closing iSCSI connection.\n");
4007 return -1;
4008 }
4009 break;
4010 }
4011
4012 return ret;
ba159914
NB		 4013reject:
4014 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 4015}
4016
e48354ce
NB		 4017int iscsi_target_rx_thread(void *arg)
4018{
4019 int ret;
4020 u8 buffer[ISCSI_HDR_LEN], opcode;
4021 u32 checksum = 0, digest = 0;
4022 struct iscsi_conn *conn = NULL;
8359cf43 4023 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 4024 struct kvec iov;
4025 /*
4026 * Allow ourselves to be interrupted by SIGINT so that a
4027 * connection recovery / failure event can be triggered externally.
4028 */
4029 allow_signal(SIGINT);
4030
4031restart:
4032 conn = iscsi_rx_thread_pre_handler(ts);
4033 if (!conn)
4034 goto out;
4035
3e1c81a9
NB		 4036 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4037 struct completion comp;
4038 int rc;
4039
4040 init_completion(&comp);
4041 rc = wait_for_completion_interruptible(&comp);
4042 if (rc < 0)
4043 goto transport_err;
4044
4045 goto out;
4046 }
4047
e48354ce
NB		 4048 while (!kthread_should_stop()) {
4049 /*
4050 * Ensure that both TX and RX per connection kthreads
4051 * are scheduled to run on the same CPU.
4052 */
4053 iscsit_thread_check_cpumask(conn, current, 0);
4054
4055 memset(buffer, 0, ISCSI_HDR_LEN);
4056 memset(&iov, 0, sizeof(struct kvec));
4057
4058 iov.iov_base = buffer;
4059 iov.iov_len = ISCSI_HDR_LEN;
4060
4061 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4062 if (ret != ISCSI_HDR_LEN) {
4063 iscsit_rx_thread_wait_for_tcp(conn);
4064 goto transport_err;
4065 }
4066
e48354ce
NB		 4067 if (conn->conn_ops->HeaderDigest) {
4068 iov.iov_base = &digest;
4069 iov.iov_len = ISCSI_CRC_LEN;
4070
4071 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4072 if (ret != ISCSI_CRC_LEN) {
4073 iscsit_rx_thread_wait_for_tcp(conn);
4074 goto transport_err;
4075 }
4076
4077 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4078 buffer, ISCSI_HDR_LEN,
4079 0, NULL, (u8 *)&checksum);
4080
4081 if (digest != checksum) {
4082 pr_err("HeaderDigest CRC32C failed,"
4083 " received 0x%08x, computed 0x%08x\n",
4084 digest, checksum);
4085 /*
4086 * Set the PDU to 0xff so it will intentionally
4087 * hit default in the switch below.
4088 */
4089 memset(buffer, 0xff, ISCSI_HDR_LEN);
4090 spin_lock_bh(&conn->sess->session_stats_lock);
4091 conn->sess->conn_digest_errors++;
4092 spin_unlock_bh(&conn->sess->session_stats_lock);
4093 } else {
4094 pr_debug("Got HeaderDigest CRC32C"
4095 " 0x%08x\n", checksum);
4096 }
4097 }
4098
4099 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4100 goto transport_err;
4101
4102 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4103
4104 if (conn->sess->sess_ops->SessionType &&
4105 ((!(opcode & ISCSI_OP_TEXT)) ||
4106 (!(opcode & ISCSI_OP_LOGOUT)))) {
4107 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4108 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4109 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4110 buffer);
e48354ce
NB		 4111 goto transport_err;
4112 }
4113
3e1c81a9
NB		 4114 ret = iscsi_target_rx_opcode(conn, buffer);
4115 if (ret < 0)
4116 goto transport_err;
e48354ce
NB		 4117 }
4118
4119transport_err:
4120 if (!signal_pending(current))
4121 atomic_set(&conn->transport_failed, 1);
4122 iscsit_take_action_for_connection_exit(conn);
4123 goto restart;
4124out:
4125 return 0;
4126}
4127
4128static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4129{
4130 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4131 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4132 /*
4133 * We expect this function to only ever be called from either RX or TX
4134 * thread context via iscsit_close_connection() once the other context
4135 * has been reset -> returned sleeping pre-handler state.
4136 */
4137 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4138 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4139
2fbb471e 4140 list_del(&cmd->i_conn_node);
e48354ce
NB		 4141 spin_unlock_bh(&conn->cmd_lock);
4142
4143 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4144
aafc9d15 4145 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4146
4147 spin_lock_bh(&conn->cmd_lock);
4148 }
4149 spin_unlock_bh(&conn->cmd_lock);
4150}
4151
4152static void iscsit_stop_timers_for_cmds(
4153 struct iscsi_conn *conn)
4154{
4155 struct iscsi_cmd *cmd;
4156
4157 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4158 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4159 if (cmd->data_direction == DMA_TO_DEVICE)
4160 iscsit_stop_dataout_timer(cmd);
4161 }
4162 spin_unlock_bh(&conn->cmd_lock);
4163}
4164
4165int iscsit_close_connection(
4166 struct iscsi_conn *conn)
4167{
4168 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4169 struct iscsi_session *sess = conn->sess;
4170
4171 pr_debug("Closing iSCSI connection CID %hu on SID:"
4172 " %u\n", conn->cid, sess->sid);
4173 /*
4174 * Always up conn_logout_comp just in case the RX Thread is sleeping
4175 * and the logout response never got sent because the connection
4176 * failed.
4177 */
4178 complete(&conn->conn_logout_comp);
4179
4180 iscsi_release_thread_set(conn);
4181
4182 iscsit_stop_timers_for_cmds(conn);
4183 iscsit_stop_nopin_response_timer(conn);
4184 iscsit_stop_nopin_timer(conn);
4185 iscsit_free_queue_reqs_for_conn(conn);
4186
4187 /*
4188 * During Connection recovery drop unacknowledged out of order
4189 * commands for this connection, and prepare the other commands
4190 * for realligence.
4191 *
4192 * During normal operation clear the out of order commands (but
4193 * do not free the struct iscsi_ooo_cmdsn's) and release all
4194 * struct iscsi_cmds.
4195 */
4196 if (atomic_read(&conn->connection_recovery)) {
4197 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4198 iscsit_prepare_cmds_for_realligance(conn);
4199 } else {
4200 iscsit_clear_ooo_cmdsns_for_conn(conn);
4201 iscsit_release_commands_from_conn(conn);
4202 }
4203
4204 /*
4205 * Handle decrementing session or connection usage count if
4206 * a logout response was not able to be sent because the
4207 * connection failed. Fall back to Session Recovery here.
4208 */
4209 if (atomic_read(&conn->conn_logout_remove)) {
4210 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4211 iscsit_dec_conn_usage_count(conn);
4212 iscsit_dec_session_usage_count(sess);
4213 }
4214 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4215 iscsit_dec_conn_usage_count(conn);
4216
4217 atomic_set(&conn->conn_logout_remove, 0);
4218 atomic_set(&sess->session_reinstatement, 0);
4219 atomic_set(&sess->session_fall_back_to_erl0, 1);
4220 }
4221
4222 spin_lock_bh(&sess->conn_lock);
4223 list_del(&conn->conn_list);
4224
4225 /*
4226 * Attempt to let the Initiator know this connection failed by
4227 * sending an Connection Dropped Async Message on another
4228 * active connection.
4229 */
4230 if (atomic_read(&conn->connection_recovery))
4231 iscsit_build_conn_drop_async_message(conn);
4232
4233 spin_unlock_bh(&sess->conn_lock);
4234
4235 /*
4236 * If connection reinstatement is being performed on this connection,
4237 * up the connection reinstatement semaphore that is being blocked on
4238 * in iscsit_cause_connection_reinstatement().
4239 */
4240 spin_lock_bh(&conn->state_lock);
4241 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4242 spin_unlock_bh(&conn->state_lock);
4243 complete(&conn->conn_wait_comp);
4244 wait_for_completion(&conn->conn_post_wait_comp);
4245 spin_lock_bh(&conn->state_lock);
4246 }
4247
4248 /*
4249 * If connection reinstatement is being performed on this connection
4250 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4251 * connection wait rcfr semaphore that is being blocked on
4252 * an iscsit_connection_reinstatement_rcfr().
4253 */
4254 if (atomic_read(&conn->connection_wait_rcfr)) {
4255 spin_unlock_bh(&conn->state_lock);
4256 complete(&conn->conn_wait_rcfr_comp);
4257 wait_for_completion(&conn->conn_post_wait_comp);
4258 spin_lock_bh(&conn->state_lock);
4259 }
4260 atomic_set(&conn->connection_reinstatement, 1);
4261 spin_unlock_bh(&conn->state_lock);
4262
4263 /*
4264 * If any other processes are accessing this connection pointer we
4265 * must wait until they have completed.
4266 */
4267 iscsit_check_conn_usage_count(conn);
4268
4269 if (conn->conn_rx_hash.tfm)
4270 crypto_free_hash(conn->conn_rx_hash.tfm);
4271 if (conn->conn_tx_hash.tfm)
4272 crypto_free_hash(conn->conn_tx_hash.tfm);
4273
4274 if (conn->conn_cpumask)
4275 free_cpumask_var(conn->conn_cpumask);
4276
4277 kfree(conn->conn_ops);
4278 conn->conn_ops = NULL;
4279
bf6932f4 4280 if (conn->sock)
e48354ce 4281 sock_release(conn->sock);
baa4d64b
NB		 4282
4283 if (conn->conn_transport->iscsit_free_conn)
4284 conn->conn_transport->iscsit_free_conn(conn);
4285
4286 iscsit_put_transport(conn->conn_transport);
4287
e48354ce
NB		 4288 conn->thread_set = NULL;
4289
4290 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4291 conn->conn_state = TARG_CONN_STATE_FREE;
4292 kfree(conn);
4293
4294 spin_lock_bh(&sess->conn_lock);
4295 atomic_dec(&sess->nconn);
4296 pr_debug("Decremented iSCSI connection count to %hu from node:"
4297 " %s\n", atomic_read(&sess->nconn),
4298 sess->sess_ops->InitiatorName);
4299 /*
4300 * Make sure that if one connection fails in an non ERL=2 iSCSI
4301 * Session that they all fail.
4302 */
4303 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4304 !atomic_read(&sess->session_logout))
4305 atomic_set(&sess->session_fall_back_to_erl0, 1);
4306
4307 /*
4308 * If this was not the last connection in the session, and we are
4309 * performing session reinstatement or falling back to ERL=0, call
4310 * iscsit_stop_session() without sleeping to shutdown the other
4311 * active connections.
4312 */
4313 if (atomic_read(&sess->nconn)) {
4314 if (!atomic_read(&sess->session_reinstatement) &&
4315 !atomic_read(&sess->session_fall_back_to_erl0)) {
4316 spin_unlock_bh(&sess->conn_lock);
4317 return 0;
4318 }
4319 if (!atomic_read(&sess->session_stop_active)) {
4320 atomic_set(&sess->session_stop_active, 1);
4321 spin_unlock_bh(&sess->conn_lock);
4322 iscsit_stop_session(sess, 0, 0);
4323 return 0;
4324 }
4325 spin_unlock_bh(&sess->conn_lock);
4326 return 0;
4327 }
4328
4329 /*
4330 * If this was the last connection in the session and one of the
4331 * following is occurring:
4332 *
4333 * Session Reinstatement is not being performed, and are falling back
4334 * to ERL=0 call iscsit_close_session().
4335 *
4336 * Session Logout was requested. iscsit_close_session() will be called
4337 * elsewhere.
4338 *
4339 * Session Continuation is not being performed, start the Time2Retain
4340 * handler and check if sleep_on_sess_wait_sem is active.
4341 */
4342 if (!atomic_read(&sess->session_reinstatement) &&
4343 atomic_read(&sess->session_fall_back_to_erl0)) {
4344 spin_unlock_bh(&sess->conn_lock);
99367f01 4345 target_put_session(sess->se_sess);
e48354ce
NB		 4346
4347 return 0;
4348 } else if (atomic_read(&sess->session_logout)) {
4349 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4350 sess->session_state = TARG_SESS_STATE_FREE;
4351 spin_unlock_bh(&sess->conn_lock);
4352
4353 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4354 complete(&sess->session_wait_comp);
4355
4356 return 0;
4357 } else {
4358 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4359 sess->session_state = TARG_SESS_STATE_FAILED;
4360
4361 if (!atomic_read(&sess->session_continuation)) {
4362 spin_unlock_bh(&sess->conn_lock);
4363 iscsit_start_time2retain_handler(sess);
4364 } else
4365 spin_unlock_bh(&sess->conn_lock);
4366
4367 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4368 complete(&sess->session_wait_comp);
4369
4370 return 0;
4371 }
4372 spin_unlock_bh(&sess->conn_lock);
4373
4374 return 0;
4375}
4376
4377int iscsit_close_session(struct iscsi_session *sess)
4378{
4379 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4380 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4381
4382 if (atomic_read(&sess->nconn)) {
4383 pr_err("%d connection(s) still exist for iSCSI session"
4384 " to %s\n", atomic_read(&sess->nconn),
4385 sess->sess_ops->InitiatorName);
4386 BUG();
4387 }
4388
4389 spin_lock_bh(&se_tpg->session_lock);
4390 atomic_set(&sess->session_logout, 1);
4391 atomic_set(&sess->session_reinstatement, 1);
4392 iscsit_stop_time2retain_timer(sess);
4393 spin_unlock_bh(&se_tpg->session_lock);
4394
4395 /*
4396 * transport_deregister_session_configfs() will clear the
4397 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4398 * can be setting it again with __transport_register_session() in
4399 * iscsi_post_login_handler() again after the iscsit_stop_session()
4400 * completes in iscsi_np context.
4401 */
4402 transport_deregister_session_configfs(sess->se_sess);
4403
4404 /*
4405 * If any other processes are accessing this session pointer we must
4406 * wait until they have completed. If we are in an interrupt (the
4407 * time2retain handler) and contain and active session usage count we
4408 * restart the timer and exit.
4409 */
4410 if (!in_interrupt()) {
4411 if (iscsit_check_session_usage_count(sess) == 1)
4412 iscsit_stop_session(sess, 1, 1);
4413 } else {
4414 if (iscsit_check_session_usage_count(sess) == 2) {
4415 atomic_set(&sess->session_logout, 0);
4416 iscsit_start_time2retain_handler(sess);
4417 return 0;
4418 }
4419 }
4420
4421 transport_deregister_session(sess->se_sess);
4422
4423 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4424 iscsit_free_connection_recovery_entires(sess);
4425
4426 iscsit_free_all_ooo_cmdsns(sess);
4427
4428 spin_lock_bh(&se_tpg->session_lock);
4429 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4430 sess->session_state = TARG_SESS_STATE_FREE;
4431 pr_debug("Released iSCSI session from node: %s\n",
4432 sess->sess_ops->InitiatorName);
4433 tpg->nsessions--;
4434 if (tpg->tpg_tiqn)
4435 tpg->tpg_tiqn->tiqn_nsessions--;
4436
4437 pr_debug("Decremented number of active iSCSI Sessions on"
4438 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4439
4440 spin_lock(&sess_idr_lock);
4441 idr_remove(&sess_idr, sess->session_index);
4442 spin_unlock(&sess_idr_lock);
4443
4444 kfree(sess->sess_ops);
4445 sess->sess_ops = NULL;
4446 spin_unlock_bh(&se_tpg->session_lock);
4447
4448 kfree(sess);
4449 return 0;
4450}
4451
4452static void iscsit_logout_post_handler_closesession(
4453 struct iscsi_conn *conn)
4454{
4455 struct iscsi_session *sess = conn->sess;
4456
4457 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4458 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4459
4460 atomic_set(&conn->conn_logout_remove, 0);
4461 complete(&conn->conn_logout_comp);
4462
4463 iscsit_dec_conn_usage_count(conn);
4464 iscsit_stop_session(sess, 1, 1);
4465 iscsit_dec_session_usage_count(sess);
99367f01 4466 target_put_session(sess->se_sess);
e48354ce
NB		 4467}
4468
4469static void iscsit_logout_post_handler_samecid(
4470 struct iscsi_conn *conn)
4471{
4472 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4473 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4474
4475 atomic_set(&conn->conn_logout_remove, 0);
4476 complete(&conn->conn_logout_comp);
4477
4478 iscsit_cause_connection_reinstatement(conn, 1);
4479 iscsit_dec_conn_usage_count(conn);
4480}
4481
4482static void iscsit_logout_post_handler_diffcid(
4483 struct iscsi_conn *conn,
4484 u16 cid)
4485{
4486 struct iscsi_conn *l_conn;
4487 struct iscsi_session *sess = conn->sess;
4488
4489 if (!sess)
4490 return;
4491
4492 spin_lock_bh(&sess->conn_lock);
4493 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4494 if (l_conn->cid == cid) {
4495 iscsit_inc_conn_usage_count(l_conn);
4496 break;
4497 }
4498 }
4499 spin_unlock_bh(&sess->conn_lock);
4500
4501 if (!l_conn)
4502 return;
4503
4504 if (l_conn->sock)
4505 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4506
4507 spin_lock_bh(&l_conn->state_lock);
4508 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4509 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4510 spin_unlock_bh(&l_conn->state_lock);
4511
4512 iscsit_cause_connection_reinstatement(l_conn, 1);
4513 iscsit_dec_conn_usage_count(l_conn);
4514}
4515
4516/*
4517 * Return of 0 causes the TX thread to restart.
4518 */
2ec5a8c1 4519int iscsit_logout_post_handler(
e48354ce
NB		 4520 struct iscsi_cmd *cmd,
4521 struct iscsi_conn *conn)
4522{
4523 int ret = 0;
4524
4525 switch (cmd->logout_reason) {
4526 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4527 switch (cmd->logout_response) {
4528 case ISCSI_LOGOUT_SUCCESS:
4529 case ISCSI_LOGOUT_CLEANUP_FAILED:
4530 default:
4531 iscsit_logout_post_handler_closesession(conn);
4532 break;
4533 }
4534 ret = 0;
4535 break;
4536 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4537 if (conn->cid == cmd->logout_cid) {
4538 switch (cmd->logout_response) {
4539 case ISCSI_LOGOUT_SUCCESS:
4540 case ISCSI_LOGOUT_CLEANUP_FAILED:
4541 default:
4542 iscsit_logout_post_handler_samecid(conn);
4543 break;
4544 }
4545 ret = 0;
4546 } else {
4547 switch (cmd->logout_response) {
4548 case ISCSI_LOGOUT_SUCCESS:
4549 iscsit_logout_post_handler_diffcid(conn,
4550 cmd->logout_cid);
4551 break;
4552 case ISCSI_LOGOUT_CID_NOT_FOUND:
4553 case ISCSI_LOGOUT_CLEANUP_FAILED:
4554 default:
4555 break;
4556 }
4557 ret = 1;
4558 }
4559 break;
4560 case ISCSI_LOGOUT_REASON_RECOVERY:
4561 switch (cmd->logout_response) {
4562 case ISCSI_LOGOUT_SUCCESS:
4563 case ISCSI_LOGOUT_CID_NOT_FOUND:
4564 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4565 case ISCSI_LOGOUT_CLEANUP_FAILED:
4566 default:
4567 break;
4568 }
4569 ret = 1;
4570 break;
4571 default:
4572 break;
4573
4574 }
4575 return ret;
4576}
2ec5a8c1 4577EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4578
4579void iscsit_fail_session(struct iscsi_session *sess)
4580{
4581 struct iscsi_conn *conn;
4582
4583 spin_lock_bh(&sess->conn_lock);
4584 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4585 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4586 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4587 }
4588 spin_unlock_bh(&sess->conn_lock);
4589
4590 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4591 sess->session_state = TARG_SESS_STATE_FAILED;
4592}
4593
4594int iscsit_free_session(struct iscsi_session *sess)
4595{
4596 u16 conn_count = atomic_read(&sess->nconn);
4597 struct iscsi_conn *conn, *conn_tmp = NULL;
4598 int is_last;
4599
4600 spin_lock_bh(&sess->conn_lock);
4601 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4602
4603 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4604 conn_list) {
4605 if (conn_count == 0)
4606 break;
4607
4608 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4609 is_last = 1;
4610 } else {
4611 iscsit_inc_conn_usage_count(conn_tmp);
4612 is_last = 0;
4613 }
4614 iscsit_inc_conn_usage_count(conn);
4615
4616 spin_unlock_bh(&sess->conn_lock);
4617 iscsit_cause_connection_reinstatement(conn, 1);
4618 spin_lock_bh(&sess->conn_lock);
4619
4620 iscsit_dec_conn_usage_count(conn);
4621 if (is_last == 0)
4622 iscsit_dec_conn_usage_count(conn_tmp);
4623
4624 conn_count--;
4625 }
4626
4627 if (atomic_read(&sess->nconn)) {
4628 spin_unlock_bh(&sess->conn_lock);
4629 wait_for_completion(&sess->session_wait_comp);
4630 } else
4631 spin_unlock_bh(&sess->conn_lock);
4632
99367f01 4633 target_put_session(sess->se_sess);
e48354ce
NB		 4634 return 0;
4635}
4636
4637void iscsit_stop_session(
4638 struct iscsi_session *sess,
4639 int session_sleep,
4640 int connection_sleep)
4641{
4642 u16 conn_count = atomic_read(&sess->nconn);
4643 struct iscsi_conn *conn, *conn_tmp = NULL;
4644 int is_last;
4645
4646 spin_lock_bh(&sess->conn_lock);
4647 if (session_sleep)
4648 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4649
4650 if (connection_sleep) {
4651 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4652 conn_list) {
4653 if (conn_count == 0)
4654 break;
4655
4656 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4657 is_last = 1;
4658 } else {
4659 iscsit_inc_conn_usage_count(conn_tmp);
4660 is_last = 0;
4661 }
4662 iscsit_inc_conn_usage_count(conn);
4663
4664 spin_unlock_bh(&sess->conn_lock);
4665 iscsit_cause_connection_reinstatement(conn, 1);
4666 spin_lock_bh(&sess->conn_lock);
4667
4668 iscsit_dec_conn_usage_count(conn);
4669 if (is_last == 0)
4670 iscsit_dec_conn_usage_count(conn_tmp);
4671 conn_count--;
4672 }
4673 } else {
4674 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4675 iscsit_cause_connection_reinstatement(conn, 0);
4676 }
4677
4678 if (session_sleep && atomic_read(&sess->nconn)) {
4679 spin_unlock_bh(&sess->conn_lock);
4680 wait_for_completion(&sess->session_wait_comp);
4681 } else
4682 spin_unlock_bh(&sess->conn_lock);
4683}
4684
4685int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4686{
4687 struct iscsi_session *sess;
4688 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4689 struct se_session *se_sess, *se_sess_tmp;
4690 int session_count = 0;
4691
4692 spin_lock_bh(&se_tpg->session_lock);
4693 if (tpg->nsessions && !force) {
4694 spin_unlock_bh(&se_tpg->session_lock);
4695 return -1;
4696 }
4697
4698 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4699 sess_list) {
4700 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4701
4702 spin_lock(&sess->conn_lock);
4703 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4704 atomic_read(&sess->session_logout) ||
4705 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4706 spin_unlock(&sess->conn_lock);
4707 continue;
4708 }
4709 atomic_set(&sess->session_reinstatement, 1);
4710 spin_unlock(&sess->conn_lock);
4711 spin_unlock_bh(&se_tpg->session_lock);
4712
4713 iscsit_free_session(sess);
4714 spin_lock_bh(&se_tpg->session_lock);
4715
4716 session_count++;
4717 }
4718 spin_unlock_bh(&se_tpg->session_lock);
4719
4720 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4721 " Group: %hu\n", session_count, tpg->tpgt);
4722 return 0;
4723}
4724
4725MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4726MODULE_VERSION("4.1.x");
4727MODULE_AUTHOR("nab@Linux-iSCSI.org");
4728MODULE_LICENSE("GPL");
4729
4730module_init(iscsi_target_init_module);
4731module_exit(iscsi_target_cleanup_module);
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