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Merge remote-tracking branch 'regulator/topic/da9063' into regulator-next
[deliverable/linux.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{
f56cbbb4
NB		 756 LIST_HEAD(ack_list);
757 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 758
759 conn->exp_statsn = exp_statsn;
760
3e1c81a9
NB		 761 if (conn->sess->sess_ops->RDMAExtensions)
762 return;
763
e48354ce 764 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 765 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 766 spin_lock(&cmd->istate_lock);
767 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 768 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 769 cmd->i_state = ISTATE_REMOVE;
770 spin_unlock(&cmd->istate_lock);
f56cbbb4 771 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 772 continue;
773 }
774 spin_unlock(&cmd->istate_lock);
775 }
776 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 777
778 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
779 list_del(&cmd->i_conn_node);
780 iscsit_free_cmd(cmd, false);
781 }
e48354ce
NB		 782}
783
784static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
785{
f80e8ed3 786 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 787
c0427f15 788 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 789
790 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
791 if (!cmd->iov_data) {
792 pr_err("Unable to allocate cmd->iov_data\n");
793 return -ENOMEM;
794 }
795
796 cmd->orig_iov_data_count = iov_count;
797 return 0;
798}
799
3e1c81a9
NB		 800int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
801 unsigned char *buf)
e48354ce 802{
3e1c81a9 803 int data_direction, payload_length;
e48354ce 804 struct iscsi_scsi_req *hdr;
d28b1169
AG		 805 int iscsi_task_attr;
806 int sam_task_attr;
e48354ce
NB		 807
808 spin_lock_bh(&conn->sess->session_stats_lock);
809 conn->sess->cmd_pdus++;
810 if (conn->sess->se_sess->se_node_acl) {
811 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
812 conn->sess->se_sess->se_node_acl->num_cmds++;
813 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
814 }
815 spin_unlock_bh(&conn->sess->session_stats_lock);
816
817 hdr = (struct iscsi_scsi_req *) buf;
818 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 819
820 /* FIXME; Add checks for AdditionalHeaderSegment */
821
822 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
823 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
824 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
825 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 826 return iscsit_add_reject_cmd(cmd,
827 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 828 }
829
830 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
831 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
832 /*
833 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
834 * that adds support for RESERVE/RELEASE. There is a bug
835 * add with this new functionality that sets R/W bits when
836 * neither CDB carries any READ or WRITE datapayloads.
837 */
838 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
839 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
840 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
841 goto done;
842 }
843
844 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
845 " set when Expected Data Transfer Length is 0 for"
846 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
ba159914
NB		 847 return iscsit_add_reject_cmd(cmd,
848 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 849 }
850done:
851
852 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
853 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
854 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
855 " MUST be set if Expected Data Transfer Length is not 0."
856 " Bad iSCSI Initiator\n");
ba159914
NB		 857 return iscsit_add_reject_cmd(cmd,
858 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 859 }
860
861 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
862 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
863 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 864 return iscsit_add_reject_cmd(cmd,
865 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 866 }
867
868 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
869 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
870 " Scsi Command PDU.\n");
ba159914
NB		 871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 873 }
874
875 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
876 pr_err("ImmediateData=No but DataSegmentLength=%u,"
877 " protocol error.\n", payload_length);
ba159914
NB		 878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 880 }
881
ba159914 882 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 883 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
884 pr_err("Expected Data Transfer Length and Length of"
885 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
886 " bit is not set protocol error\n");
ba159914
NB		 887 return iscsit_add_reject_cmd(cmd,
888 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 889 }
890
50e5c87d 891 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 892 pr_err("DataSegmentLength: %u is greater than"
893 " EDTL: %u, protocol error.\n", payload_length,
894 hdr->data_length);
ba159914
NB		 895 return iscsit_add_reject_cmd(cmd,
896 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 897 }
898
21f5aa7e 899 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 900 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 901 " MaxXmitDataSegmentLength: %u, protocol error.\n",
902 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 903 return iscsit_add_reject_cmd(cmd,
904 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 905 }
906
907 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
908 pr_err("DataSegmentLength: %u is greater than"
909 " FirstBurstLength: %u, protocol error.\n",
910 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 911 return iscsit_add_reject_cmd(cmd,
912 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 913 }
914
915 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
916 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
917 DMA_NONE;
918
d28b1169 919 cmd->data_direction = data_direction;
d28b1169
AG		 920 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
921 /*
922 * Figure out the SAM Task Attribute for the incoming SCSI CDB
923 */
924 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
925 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
926 sam_task_attr = MSG_SIMPLE_TAG;
927 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
928 sam_task_attr = MSG_ORDERED_TAG;
929 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
930 sam_task_attr = MSG_HEAD_TAG;
931 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
932 sam_task_attr = MSG_ACA_TAG;
933 else {
934 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
935 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
936 sam_task_attr = MSG_SIMPLE_TAG;
937 }
938
e48354ce
NB		 939 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
940 cmd->i_state = ISTATE_NEW_CMD;
941 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
942 cmd->immediate_data = (payload_length) ? 1 : 0;
943 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
944 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
945 if (cmd->unsolicited_data)
946 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
947
948 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
949 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
950 spin_lock_bh(&conn->sess->ttt_lock);
951 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
952 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
953 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
954 spin_unlock_bh(&conn->sess->ttt_lock);
955 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
956 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 957 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
958 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 959 cmd->first_burst_len = payload_length;
960
3e1c81a9
NB		 961 if (!conn->sess->sess_ops->RDMAExtensions &&
962 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 963 struct iscsi_datain_req *dr;
964
965 dr = iscsit_allocate_datain_req();
966 if (!dr)
ba159914
NB		 967 return iscsit_add_reject_cmd(cmd,
968 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 969
970 iscsit_attach_datain_req(cmd, dr);
971 }
972
065ca1e4
AG		 973 /*
974 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
975 */
976 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 977 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
978 cmd->data_direction, sam_task_attr,
979 cmd->sense_buffer + 2);
065ca1e4
AG		 980
981 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
982 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 983 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
984 conn->cid);
985
986 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 987
de103c93
CH		 988 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
989 scsilun_to_int(&hdr->lun));
990 if (cmd->sense_reason)
991 goto attach_cmd;
992
993 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
994 if (cmd->sense_reason) {
995 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 996 return iscsit_add_reject_cmd(cmd,
997 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 998 }
de103c93 999
e48354ce
NB		 1000 goto attach_cmd;
1001 }
a12f41f8 1002
de103c93 1003 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1004 return iscsit_add_reject_cmd(cmd,
1005 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1006 }
1007
1008attach_cmd:
1009 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1010 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1011 spin_unlock_bh(&conn->cmd_lock);
1012 /*
1013 * Check if we need to delay processing because of ALUA
1014 * Active/NonOptimized primary access state..
1015 */
1016 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1017
3e1c81a9
NB		 1018 return 0;
1019}
1020EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1021
3e1c81a9
NB		 1022void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1023{
1024 iscsit_set_dataout_sequence_values(cmd);
1025
1026 spin_lock_bh(&cmd->dataout_timeout_lock);
1027 iscsit_start_dataout_timer(cmd, cmd->conn);
1028 spin_unlock_bh(&cmd->dataout_timeout_lock);
1029}
1030EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1031
1032int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1033 struct iscsi_scsi_req *hdr)
1034{
1035 int cmdsn_ret = 0;
e48354ce
NB		 1036 /*
1037 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1038 * the Immediate Bit is not set, and no Immediate
1039 * Data is attached.
1040 *
1041 * A PDU/CmdSN carrying Immediate Data can only
1042 * be processed after the DataCRC has passed.
1043 * If the DataCRC fails, the CmdSN MUST NOT
1044 * be acknowledged. (See below)
1045 */
1046 if (!cmd->immediate_data) {
561bf158
NB		 1047 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1048 (unsigned char *)hdr, hdr->cmdsn);
1049 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1050 return -1;
1051 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1052 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1053 return 0;
3e1c81a9 1054 }
e48354ce
NB		 1055 }
1056
50e5c87d 1057 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1058
1059 /*
1060 * If no Immediate Data is attached, it's OK to return now.
1061 */
1062 if (!cmd->immediate_data) {
3e1c81a9
NB		 1063 if (!cmd->sense_reason && cmd->unsolicited_data)
1064 iscsit_set_unsoliticed_dataout(cmd);
1065 if (!cmd->sense_reason)
1066 return 0;
e48354ce 1067
3e1c81a9 1068 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1069 return 0;
1070 }
1071
1072 /*
3e1c81a9
NB		 1073 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1074 * execution. These exceptions are processed in CmdSN order using
1075 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1076 */
de103c93 1077 if (cmd->sense_reason) {
561bf158
NB		 1078 if (cmd->reject_reason)
1079 return 0;
1080
3e1c81a9 1081 return 1;
e48354ce
NB		 1082 }
1083 /*
1084 * Call directly into transport_generic_new_cmd() to perform
1085 * the backend memory allocation.
1086 */
de103c93 1087 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1088 if (cmd->sense_reason)
3e1c81a9 1089 return 1;
e48354ce 1090
3e1c81a9
NB		 1091 return 0;
1092}
1093EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1094
1095static int
1096iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1097 bool dump_payload)
1098{
561bf158 1099 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1100 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1101 /*
1102 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1103 */
1104 if (dump_payload == true)
1105 goto after_immediate_data;
1106
1107 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1108 cmd->first_burst_len);
e48354ce
NB		 1109after_immediate_data:
1110 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1111 /*
1112 * A PDU/CmdSN carrying Immediate Data passed
1113 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1114 * Immediate Bit is not set.
1115 */
561bf158
NB		 1116 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1117 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1118 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1119 return -1;
3e1c81a9 1120
9d86a2be 1121 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1122 int rc;
1123
1124 rc = iscsit_dump_data_payload(cmd->conn,
1125 cmd->first_burst_len, 1);
1126 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1127 return rc;
3e1c81a9
NB		 1128 } else if (cmd->unsolicited_data)
1129 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1130
e48354ce
NB		 1131 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1132 /*
1133 * Immediate Data failed DataCRC and ERL>=1,
1134 * silently drop this PDU and let the initiator
1135 * plug the CmdSN gap.
1136 *
1137 * FIXME: Send Unsolicited NOPIN with reserved
1138 * TTT here to help the initiator figure out
1139 * the missing CmdSN, although they should be
1140 * intelligent enough to determine the missing
1141 * CmdSN and issue a retry to plug the sequence.
1142 */
1143 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1144 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1145 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1146 return -1;
1147
1148 return 0;
1149}
1150
3e1c81a9
NB		 1151static int
1152iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1153 unsigned char *buf)
1154{
1155 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1156 int rc, immed_data;
1157 bool dump_payload = false;
1158
1159 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1160 if (rc < 0)
561bf158 1161 return 0;
3e1c81a9
NB		 1162 /*
1163 * Allocation iovecs needed for struct socket operations for
1164 * traditional iSCSI block I/O.
1165 */
1166 if (iscsit_allocate_iovecs(cmd) < 0) {
ba159914
NB		 1167 return iscsit_add_reject_cmd(cmd,
1168 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1169 }
1170 immed_data = cmd->immediate_data;
1171
1172 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1173 if (rc < 0)
1174 return rc;
1175 else if (rc > 0)
1176 dump_payload = true;
1177
1178 if (!immed_data)
1179 return 0;
1180
1181 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1182}
1183
e48354ce
NB		 1184static u32 iscsit_do_crypto_hash_sg(
1185 struct hash_desc *hash,
1186 struct iscsi_cmd *cmd,
1187 u32 data_offset,
1188 u32 data_length,
1189 u32 padding,
1190 u8 *pad_bytes)
1191{
1192 u32 data_crc;
1193 u32 i;
1194 struct scatterlist *sg;
1195 unsigned int page_off;
1196
1197 crypto_hash_init(hash);
1198
1199 sg = cmd->first_data_sg;
1200 page_off = cmd->first_data_sg_off;
1201
1202 i = 0;
1203 while (data_length) {
1204 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1205
1206 crypto_hash_update(hash, &sg[i], cur_len);
1207
1208 data_length -= cur_len;
1209 page_off = 0;
1210 i++;
1211 }
1212
1213 if (padding) {
1214 struct scatterlist pad_sg;
1215
1216 sg_init_one(&pad_sg, pad_bytes, padding);
1217 crypto_hash_update(hash, &pad_sg, padding);
1218 }
1219 crypto_hash_final(hash, (u8 *) &data_crc);
1220
1221 return data_crc;
1222}
1223
1224static void iscsit_do_crypto_hash_buf(
1225 struct hash_desc *hash,
80690fdb 1226 const void *buf,
e48354ce
NB		 1227 u32 payload_length,
1228 u32 padding,
1229 u8 *pad_bytes,
1230 u8 *data_crc)
1231{
1232 struct scatterlist sg;
1233
1234 crypto_hash_init(hash);
1235
8359cf43 1236 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1237 crypto_hash_update(hash, &sg, payload_length);
1238
1239 if (padding) {
1240 sg_init_one(&sg, pad_bytes, padding);
1241 crypto_hash_update(hash, &sg, padding);
1242 }
1243 crypto_hash_final(hash, data_crc);
1244}
1245
3e1c81a9
NB		 1246int
1247iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1248 struct iscsi_cmd **out_cmd)
e48354ce 1249{
3e1c81a9 1250 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1251 struct iscsi_cmd *cmd = NULL;
1252 struct se_cmd *se_cmd;
3e1c81a9
NB		 1253 u32 payload_length = ntoh24(hdr->dlength);
1254 int rc;
e48354ce
NB		 1255
1256 if (!payload_length) {
1257 pr_err("DataOUT payload is ZERO, protocol error.\n");
ba159914
NB		 1258 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1259 buf);
e48354ce
NB		 1260 }
1261
1262 /* iSCSI write */
1263 spin_lock_bh(&conn->sess->session_stats_lock);
1264 conn->sess->rx_data_octets += payload_length;
1265 if (conn->sess->se_sess->se_node_acl) {
1266 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1267 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1268 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1269 }
1270 spin_unlock_bh(&conn->sess->session_stats_lock);
1271
21f5aa7e 1272 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1273 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1274 " MaxXmitDataSegmentLength: %u\n", payload_length,
1275 conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1276 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1277 buf);
e48354ce
NB		 1278 }
1279
1280 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1281 payload_length);
1282 if (!cmd)
1283 return 0;
1284
1285 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1286 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1287 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1288 payload_length, conn->cid);
1289
1290 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1291 pr_err("Command ITT: 0x%08x received DataOUT after"
1292 " last DataOUT received, dumping payload\n",
1293 cmd->init_task_tag);
1294 return iscsit_dump_data_payload(conn, payload_length, 1);
1295 }
1296
1297 if (cmd->data_direction != DMA_TO_DEVICE) {
1298 pr_err("Command ITT: 0x%08x received DataOUT for a"
1299 " NON-WRITE command.\n", cmd->init_task_tag);
ba159914 1300 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1301 }
1302 se_cmd = &cmd->se_cmd;
1303 iscsit_mod_dataout_timer(cmd);
1304
50e5c87d 1305 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1306 pr_err("DataOut Offset: %u, Length %u greater than"
1307 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1308 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1309 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1310 }
1311
1312 if (cmd->unsolicited_data) {
1313 int dump_unsolicited_data = 0;
1314
1315 if (conn->sess->sess_ops->InitialR2T) {
1316 pr_err("Received unexpected unsolicited data"
1317 " while InitialR2T=Yes, protocol error.\n");
1318 transport_send_check_condition_and_sense(&cmd->se_cmd,
1319 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1320 return -1;
1321 }
1322 /*
1323 * Special case for dealing with Unsolicited DataOUT
1324 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1325 * failures;
1326 */
1327
1328 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1329 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1330 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1331 dump_unsolicited_data = 1;
e48354ce
NB		 1332
1333 if (dump_unsolicited_data) {
1334 /*
1335 * Check if a delayed TASK_ABORTED status needs to
1336 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1337 * received with the unsolicitied data out.
1338 */
1339 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1340 iscsit_stop_dataout_timer(cmd);
1341
1342 transport_check_aborted_status(se_cmd,
1343 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1344 return iscsit_dump_data_payload(conn, payload_length, 1);
1345 }
1346 } else {
1347 /*
1348 * For the normal solicited data path:
1349 *
1350 * Check for a delayed TASK_ABORTED status and dump any
1351 * incoming data out payload if one exists. Also, when the
1352 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1353 * data out sequence, we decrement outstanding_r2ts. Once
1354 * outstanding_r2ts reaches zero, go ahead and send the delayed
1355 * TASK_ABORTED status.
1356 */
7d680f3b 1357 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1358 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1359 if (--cmd->outstanding_r2ts < 1) {
1360 iscsit_stop_dataout_timer(cmd);
1361 transport_check_aborted_status(
1362 se_cmd, 1);
1363 }
1364
1365 return iscsit_dump_data_payload(conn, payload_length, 1);
1366 }
1367 }
1368 /*
1369 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1370 * within-command recovery checks before receiving the payload.
1371 */
3e1c81a9
NB		 1372 rc = iscsit_check_pre_dataout(cmd, buf);
1373 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1374 return 0;
3e1c81a9 1375 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1376 return -1;
1377
3e1c81a9
NB		 1378 *out_cmd = cmd;
1379 return 0;
1380}
1381EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1382
1383static int
1384iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1385 struct iscsi_data *hdr)
1386{
1387 struct kvec *iov;
1388 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1389 u32 payload_length = ntoh24(hdr->dlength);
1390 int iov_ret, data_crc_failed = 0;
1391
e48354ce
NB		 1392 rx_size += payload_length;
1393 iov = &cmd->iov_data[0];
1394
50e5c87d
CH		 1395 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1396 payload_length);
e48354ce
NB		 1397 if (iov_ret < 0)
1398 return -1;
1399
1400 iov_count += iov_ret;
1401
1402 padding = ((-payload_length) & 3);
1403 if (padding != 0) {
1404 iov[iov_count].iov_base = cmd->pad_bytes;
1405 iov[iov_count++].iov_len = padding;
1406 rx_size += padding;
1407 pr_debug("Receiving %u padding bytes.\n", padding);
1408 }
1409
1410 if (conn->conn_ops->DataDigest) {
1411 iov[iov_count].iov_base = &checksum;
1412 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1413 rx_size += ISCSI_CRC_LEN;
1414 }
1415
1416 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1417
1418 iscsit_unmap_iovec(cmd);
1419
1420 if (rx_got != rx_size)
1421 return -1;
1422
1423 if (conn->conn_ops->DataDigest) {
1424 u32 data_crc;
1425
1426 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1427 be32_to_cpu(hdr->offset),
1428 payload_length, padding,
e48354ce
NB		 1429 cmd->pad_bytes);
1430
1431 if (checksum != data_crc) {
1432 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1433 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1434 " does not match computed 0x%08x\n",
1435 hdr->itt, hdr->offset, payload_length,
1436 hdr->datasn, checksum, data_crc);
1437 data_crc_failed = 1;
1438 } else {
1439 pr_debug("Got CRC32C DataDigest 0x%08x for"
1440 " %u bytes of Data Out\n", checksum,
1441 payload_length);
1442 }
1443 }
3e1c81a9
NB		 1444
1445 return data_crc_failed;
1446}
1447
1448int
1449iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1450 bool data_crc_failed)
1451{
1452 struct iscsi_conn *conn = cmd->conn;
1453 int rc, ooo_cmdsn;
e48354ce
NB		 1454 /*
1455 * Increment post receive data and CRC values or perform
1456 * within-command recovery.
1457 */
3e1c81a9
NB		 1458 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1459 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1460 return 0;
3e1c81a9 1461 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1462 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1463 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1464 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1465 /*
1466 * Handle extra special case for out of order
1467 * Unsolicited Data Out.
1468 */
1469 spin_lock_bh(&cmd->istate_lock);
1470 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1471 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1472 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1473 spin_unlock_bh(&cmd->istate_lock);
1474
1475 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1476 if (ooo_cmdsn)
1477 return 0;
1478 target_execute_cmd(&cmd->se_cmd);
1479 return 0;
e48354ce
NB		 1480 } else /* DATAOUT_CANNOT_RECOVER */
1481 return -1;
1482
1483 return 0;
1484}
3e1c81a9 1485EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1486
3e1c81a9
NB		 1487static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1488{
1489 struct iscsi_cmd *cmd;
1490 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1491 int rc;
1492 bool data_crc_failed = false;
1493
1494 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1495 if (rc < 0)
561bf158 1496 return 0;
3e1c81a9
NB		 1497 else if (!cmd)
1498 return 0;
1499
1500 rc = iscsit_get_dataout(conn, cmd, hdr);
1501 if (rc < 0)
1502 return rc;
1503 else if (rc > 0)
1504 data_crc_failed = true;
1505
1506 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1507}
1508
778de368
NB		 1509int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1510 struct iscsi_nopout *hdr)
e48354ce 1511{
778de368 1512 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1513
66c7db68 1514 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1515 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1516 " not set, protocol error.\n");
28aaa950
NB		 1517 if (!cmd)
1518 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1519 (unsigned char *)hdr);
1520
ba159914
NB		 1521 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1522 (unsigned char *)hdr);
e48354ce
NB		 1523 }
1524
21f5aa7e 1525 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1526 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1527 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1528 " error.\n", payload_length,
21f5aa7e 1529 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1530 if (!cmd)
1531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1532 (unsigned char *)hdr);
1533
ba159914
NB		 1534 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1535 (unsigned char *)hdr);
e48354ce
NB		 1536 }
1537
3e1c81a9 1538 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1539 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1540 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1541 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1542 payload_length);
1543 /*
1544 * This is not a response to a Unsolicited NopIN, which means
1545 * it can either be a NOPOUT ping request (with a valid ITT),
1546 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1547 * Either way, make sure we allocate an struct iscsi_cmd, as both
1548 * can contain ping data.
1549 */
50e5c87d 1550 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1551 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1552 cmd->i_state = ISTATE_SEND_NOPIN;
1553 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1554 1 : 0);
1555 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1556 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1557 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1558 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1559 cmd->data_direction = DMA_NONE;
1560 }
1561
778de368
NB		 1562 return 0;
1563}
1564EXPORT_SYMBOL(iscsit_setup_nop_out);
1565
1566int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1567 struct iscsi_nopout *hdr)
1568{
1569 struct iscsi_cmd *cmd_p = NULL;
1570 int cmdsn_ret = 0;
1571 /*
1572 * Initiator is expecting a NopIN ping reply..
1573 */
1574 if (hdr->itt != RESERVED_ITT) {
1575 BUG_ON(!cmd);
1576
1577 spin_lock_bh(&conn->cmd_lock);
1578 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1579 spin_unlock_bh(&conn->cmd_lock);
1580
1581 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1582
1583 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1584 iscsit_add_cmd_to_response_queue(cmd, conn,
1585 cmd->i_state);
1586 return 0;
1587 }
1588
561bf158
NB		 1589 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1590 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1591 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1592 return 0;
778de368 1593 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1594 return -1;
778de368
NB		 1595
1596 return 0;
1597 }
1598 /*
1599 * This was a response to a unsolicited NOPIN ping.
1600 */
1601 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1602 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1603 if (!cmd_p)
1604 return -EINVAL;
1605
1606 iscsit_stop_nopin_response_timer(conn);
1607
1608 cmd_p->i_state = ISTATE_REMOVE;
1609 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1610
1611 iscsit_start_nopin_timer(conn);
1612 return 0;
1613 }
1614 /*
1615 * Otherwise, initiator is not expecting a NOPIN is response.
1616 * Just ignore for now.
1617 */
1618 return 0;
1619}
1620EXPORT_SYMBOL(iscsit_process_nop_out);
1621
1622static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1623 unsigned char *buf)
1624{
1625 unsigned char *ping_data = NULL;
1626 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1627 struct kvec *iov = NULL;
1628 u32 payload_length = ntoh24(hdr->dlength);
1629 int ret;
1630
1631 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1632 if (ret < 0)
561bf158 1633 return 0;
778de368
NB		 1634 /*
1635 * Handle NOP-OUT payload for traditional iSCSI sockets
1636 */
50e5c87d 1637 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1638 u32 checksum, data_crc, padding = 0;
1639 int niov = 0, rx_got, rx_size = payload_length;
1640
e48354ce
NB		 1641 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1642 if (!ping_data) {
1643 pr_err("Unable to allocate memory for"
1644 " NOPOUT ping data.\n");
1645 ret = -1;
1646 goto out;
1647 }
1648
1649 iov = &cmd->iov_misc[0];
1650 iov[niov].iov_base = ping_data;
1651 iov[niov++].iov_len = payload_length;
1652
1653 padding = ((-payload_length) & 3);
1654 if (padding != 0) {
1655 pr_debug("Receiving %u additional bytes"
1656 " for padding.\n", padding);
1657 iov[niov].iov_base = &cmd->pad_bytes;
1658 iov[niov++].iov_len = padding;
1659 rx_size += padding;
1660 }
1661 if (conn->conn_ops->DataDigest) {
1662 iov[niov].iov_base = &checksum;
1663 iov[niov++].iov_len = ISCSI_CRC_LEN;
1664 rx_size += ISCSI_CRC_LEN;
1665 }
1666
1667 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1668 if (rx_got != rx_size) {
1669 ret = -1;
1670 goto out;
1671 }
1672
1673 if (conn->conn_ops->DataDigest) {
1674 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1675 ping_data, payload_length,
1676 padding, cmd->pad_bytes,
1677 (u8 *)&data_crc);
1678
1679 if (checksum != data_crc) {
1680 pr_err("Ping data CRC32C DataDigest"
1681 " 0x%08x does not match computed 0x%08x\n",
1682 checksum, data_crc);
1683 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1684 pr_err("Unable to recover from"
1685 " NOPOUT Ping DataCRC failure while in"
1686 " ERL=0.\n");
1687 ret = -1;
1688 goto out;
1689 } else {
1690 /*
1691 * Silently drop this PDU and let the
1692 * initiator plug the CmdSN gap.
1693 */
1694 pr_debug("Dropping NOPOUT"
1695 " Command CmdSN: 0x%08x due to"
1696 " DataCRC error.\n", hdr->cmdsn);
1697 ret = 0;
1698 goto out;
1699 }
1700 } else {
1701 pr_debug("Got CRC32C DataDigest"
1702 " 0x%08x for %u bytes of ping data.\n",
1703 checksum, payload_length);
1704 }
1705 }
1706
1707 ping_data[payload_length] = '\0';
1708 /*
1709 * Attach ping data to struct iscsi_cmd->buf_ptr.
1710 */
8359cf43 1711 cmd->buf_ptr = ping_data;
e48354ce
NB		 1712 cmd->buf_ptr_size = payload_length;
1713
1714 pr_debug("Got %u bytes of NOPOUT ping"
1715 " data.\n", payload_length);
1716 pr_debug("Ping Data: \"%s\"\n", ping_data);
1717 }
1718
778de368 1719 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1720out:
1721 if (cmd)
aafc9d15 1722 iscsit_free_cmd(cmd, false);
778de368 1723
e48354ce
NB		 1724 kfree(ping_data);
1725 return ret;
1726}
1727
3e1c81a9
NB		 1728int
1729iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1730 unsigned char *buf)
e48354ce 1731{
e48354ce
NB		 1732 struct se_tmr_req *se_tmr;
1733 struct iscsi_tmr_req *tmr_req;
1734 struct iscsi_tm *hdr;
186a9647
NB		 1735 int out_of_order_cmdsn = 0, ret;
1736 bool sess_ref = false;
e48354ce
NB		 1737 u8 function;
1738
1739 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1740 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1741 function = hdr->flags;
1742
1743 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1744 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1745 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1746 hdr->rtt, hdr->refcmdsn, conn->cid);
1747
1748 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1749 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1750 hdr->rtt != RESERVED_ITT)) {
e48354ce 1751 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1752 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1753 }
1754
1755 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1756 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1757 pr_err("Task Management Request TASK_REASSIGN not"
1758 " issued as immediate command, bad iSCSI Initiator"
1759 "implementation\n");
ba159914
NB		 1760 return iscsit_add_reject_cmd(cmd,
1761 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1762 }
1763 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1764 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1765 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1766
d28b1169
AG		 1767 cmd->data_direction = DMA_NONE;
1768
1769 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1770 if (!cmd->tmr_req) {
1771 pr_err("Unable to allocate memory for"
1772 " Task Management command!\n");
ba159914
NB		 1773 return iscsit_add_reject_cmd(cmd,
1774 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1775 buf);
d28b1169
AG		 1776 }
1777
1778 /*
1779 * TASK_REASSIGN for ERL=2 / connection stays inside of
1780 * LIO-Target $FABRIC_MOD
1781 */
1782 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1783
1784 u8 tcm_function;
1785 int ret;
1786
1787 transport_init_se_cmd(&cmd->se_cmd,
1788 &lio_target_fabric_configfs->tf_ops,
1789 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1790 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1791
186a9647
NB		 1792 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1793 sess_ref = true;
1794
d28b1169
AG		 1795 switch (function) {
1796 case ISCSI_TM_FUNC_ABORT_TASK:
1797 tcm_function = TMR_ABORT_TASK;
1798 break;
1799 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1800 tcm_function = TMR_ABORT_TASK_SET;
1801 break;
1802 case ISCSI_TM_FUNC_CLEAR_ACA:
1803 tcm_function = TMR_CLEAR_ACA;
1804 break;
1805 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1806 tcm_function = TMR_CLEAR_TASK_SET;
1807 break;
1808 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1809 tcm_function = TMR_LUN_RESET;
1810 break;
1811 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1812 tcm_function = TMR_TARGET_WARM_RESET;
1813 break;
1814 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1815 tcm_function = TMR_TARGET_COLD_RESET;
1816 break;
1817 default:
1818 pr_err("Unknown iSCSI TMR Function:"
1819 " 0x%02x\n", function);
ba159914
NB		 1820 return iscsit_add_reject_cmd(cmd,
1821 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1822 }
1823
1824 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1825 tcm_function, GFP_KERNEL);
1826 if (ret < 0)
ba159914
NB		 1827 return iscsit_add_reject_cmd(cmd,
1828 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1829
1830 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1831 }
e48354ce
NB		 1832
1833 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1834 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1835 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1836 cmd->init_task_tag = hdr->itt;
1837 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1838 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1839 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1840 se_tmr = cmd->se_cmd.se_tmr_req;
1841 tmr_req = cmd->tmr_req;
1842 /*
1843 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1844 */
1845 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1846 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1847 scsilun_to_int(&hdr->lun));
e48354ce 1848 if (ret < 0) {
e48354ce
NB		 1849 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1850 goto attach;
1851 }
1852 }
1853
1854 switch (function) {
1855 case ISCSI_TM_FUNC_ABORT_TASK:
1856 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1857 if (se_tmr->response)
e48354ce 1858 goto attach;
e48354ce
NB		 1859 break;
1860 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1861 case ISCSI_TM_FUNC_CLEAR_ACA:
1862 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1863 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1864 break;
1865 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1866 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1867 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1868 goto attach;
1869 }
1870 break;
1871 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1872 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1873 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1874 goto attach;
1875 }
1876 break;
1877 case ISCSI_TM_FUNC_TASK_REASSIGN:
1878 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1879 /*
1880 * Perform sanity checks on the ExpDataSN only if the
1881 * TASK_REASSIGN was successful.
1882 */
de103c93 1883 if (se_tmr->response)
e48354ce
NB		 1884 break;
1885
1886 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 1887 return iscsit_add_reject_cmd(cmd,
1888 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1889 break;
1890 default:
1891 pr_err("Unknown TMR function: 0x%02x, protocol"
1892 " error.\n", function);
e48354ce
NB		 1893 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1894 goto attach;
1895 }
1896
1897 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1898 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1899 se_tmr->call_transport = 1;
1900attach:
1901 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1902 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1903 spin_unlock_bh(&conn->cmd_lock);
1904
1905 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 1906 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1907 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1908 out_of_order_cmdsn = 1;
5a4c8666 1909 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1910 return 0;
5a4c8666 1911 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1912 return -1;
e48354ce 1913 }
50e5c87d 1914 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1915
5a4c8666 1916 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1917 return 0;
1918 /*
1919 * Found the referenced task, send to transport for processing.
1920 */
1921 if (se_tmr->call_transport)
1922 return transport_generic_handle_tmr(&cmd->se_cmd);
1923
1924 /*
1925 * Could not find the referenced LUN, task, or Task Management
1926 * command not authorized or supported. Change state and
1927 * let the tx_thread send the response.
1928 *
1929 * For connection recovery, this is also the default action for
1930 * TMR TASK_REASSIGN.
1931 */
186a9647
NB		 1932 if (sess_ref) {
1933 pr_debug("Handle TMR, using sess_ref=true check\n");
1934 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1935 }
1936
e48354ce
NB		 1937 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1938 return 0;
1939}
3e1c81a9 1940EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1941
1942/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 1943int
1944iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1945 struct iscsi_text *hdr)
e48354ce 1946{
64534aa7 1947 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1948
21f5aa7e 1949 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1950 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1951 "greater than MaxXmitDataSegmentLength %u.\n",
1952 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1953 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1954 (unsigned char *)hdr);
e48354ce
NB		 1955 }
1956
1957 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1958 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1959 hdr->exp_statsn, payload_length);
1960
64534aa7
NB		 1961 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1962 cmd->i_state = ISTATE_SEND_TEXTRSP;
1963 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1964 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1965 cmd->targ_xfer_tag = 0xFFFFFFFF;
1966 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1967 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1968 cmd->data_direction = DMA_NONE;
1969
1970 return 0;
1971}
1972EXPORT_SYMBOL(iscsit_setup_text_cmd);
1973
1974int
1975iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1976 struct iscsi_text *hdr)
1977{
9864ca9d 1978 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 1979 int cmdsn_ret;
1980
9864ca9d
NB		 1981 if (!text_in) {
1982 pr_err("Unable to locate text_in buffer for sendtargets"
1983 " discovery\n");
1984 goto reject;
1985 }
1986 if (strncmp("SendTargets", text_in, 11) != 0) {
1987 pr_err("Received Text Data that is not"
1988 " SendTargets, cannot continue.\n");
1989 goto reject;
1990 }
1991 text_ptr = strchr(text_in, '=');
1992 if (!text_ptr) {
1993 pr_err("No \"=\" separator found in Text Data,"
1994 " cannot continue.\n");
1995 goto reject;
1996 }
1997 if (!strncmp("=All", text_ptr, 4)) {
1998 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
6665889c
NB		 1999 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2000 !strncmp("=eui.", text_ptr, 5)) {
2001 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
9864ca9d
NB		 2002 } else {
2003 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2004 goto reject;
2005 }
2006
64534aa7
NB		 2007 spin_lock_bh(&conn->cmd_lock);
2008 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2009 spin_unlock_bh(&conn->cmd_lock);
2010
2011 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2012
2013 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2014 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2015 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2016 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2017 return -1;
2018
64534aa7
NB		 2019 return 0;
2020 }
2021
2022 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2023
2024reject:
ba159914
NB		 2025 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2026 (unsigned char *)hdr);
64534aa7
NB		 2027}
2028EXPORT_SYMBOL(iscsit_process_text_cmd);
2029
2030static int
2031iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2032 unsigned char *buf)
2033{
2034 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2035 char *text_in = NULL;
2036 u32 payload_length = ntoh24(hdr->dlength);
2037 int rx_size, rc;
2038
2039 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2040 if (rc < 0)
561bf158 2041 return 0;
64534aa7
NB		 2042
2043 rx_size = payload_length;
2044 if (payload_length) {
64534aa7
NB		 2045 u32 checksum = 0, data_crc = 0;
2046 u32 padding = 0, pad_bytes = 0;
2047 int niov = 0, rx_got;
2048 struct kvec iov[3];
2049
2050 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2051 if (!text_in) {
2052 pr_err("Unable to allocate memory for"
2053 " incoming text parameters\n");
64534aa7 2054 goto reject;
e48354ce 2055 }
9864ca9d 2056 cmd->text_in_ptr = text_in;
e48354ce
NB		 2057
2058 memset(iov, 0, 3 * sizeof(struct kvec));
2059 iov[niov].iov_base = text_in;
64534aa7 2060 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2061
2062 padding = ((-payload_length) & 3);
2063 if (padding != 0) {
76f1928e 2064 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2065 iov[niov++].iov_len = padding;
2066 rx_size += padding;
2067 pr_debug("Receiving %u additional bytes"
2068 " for padding.\n", padding);
2069 }
2070 if (conn->conn_ops->DataDigest) {
2071 iov[niov].iov_base = &checksum;
2072 iov[niov++].iov_len = ISCSI_CRC_LEN;
2073 rx_size += ISCSI_CRC_LEN;
2074 }
2075
2076 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2077 if (rx_got != rx_size)
2078 goto reject;
e48354ce
NB		 2079
2080 if (conn->conn_ops->DataDigest) {
2081 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
64534aa7 2082 text_in, payload_length,
76f1928e 2083 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2084 (u8 *)&data_crc);
2085
2086 if (checksum != data_crc) {
2087 pr_err("Text data CRC32C DataDigest"
2088 " 0x%08x does not match computed"
2089 " 0x%08x\n", checksum, data_crc);
2090 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2091 pr_err("Unable to recover from"
2092 " Text Data digest failure while in"
2093 " ERL=0.\n");
64534aa7 2094 goto reject;
e48354ce
NB		 2095 } else {
2096 /*
2097 * Silently drop this PDU and let the
2098 * initiator plug the CmdSN gap.
2099 */
2100 pr_debug("Dropping Text"
2101 " Command CmdSN: 0x%08x due to"
2102 " DataCRC error.\n", hdr->cmdsn);
2103 kfree(text_in);
2104 return 0;
2105 }
2106 } else {
2107 pr_debug("Got CRC32C DataDigest"
2108 " 0x%08x for %u bytes of text data.\n",
64534aa7 2109 checksum, payload_length);
e48354ce
NB		 2110 }
2111 }
64534aa7 2112 text_in[payload_length - 1] = '\0';
e48354ce 2113 pr_debug("Successfully read %d bytes of text"
64534aa7 2114 " data.\n", payload_length);
e48354ce
NB		 2115 }
2116
64534aa7 2117 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2118
64534aa7 2119reject:
9864ca9d
NB		 2120 kfree(cmd->text_in_ptr);
2121 cmd->text_in_ptr = NULL;
ba159914 2122 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce 2123}
64534aa7 2124EXPORT_SYMBOL(iscsit_handle_text_cmd);
e48354ce
NB		 2125
2126int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2127{
2128 struct iscsi_conn *conn_p;
2129 struct iscsi_session *sess = conn->sess;
2130
2131 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2132 " for SID: %u.\n", conn->cid, conn->sess->sid);
2133
2134 atomic_set(&sess->session_logout, 1);
2135 atomic_set(&conn->conn_logout_remove, 1);
2136 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2137
2138 iscsit_inc_conn_usage_count(conn);
2139 iscsit_inc_session_usage_count(sess);
2140
2141 spin_lock_bh(&sess->conn_lock);
2142 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2143 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2144 continue;
2145
2146 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2147 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2148 }
2149 spin_unlock_bh(&sess->conn_lock);
2150
2151 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2152
2153 return 0;
2154}
2155
2156int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2157{
2158 struct iscsi_conn *l_conn;
2159 struct iscsi_session *sess = conn->sess;
2160
2161 pr_debug("Received logout request CLOSECONNECTION for CID:"
2162 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2163
2164 /*
2165 * A Logout Request with a CLOSECONNECTION reason code for a CID
2166 * can arrive on a connection with a differing CID.
2167 */
2168 if (conn->cid == cmd->logout_cid) {
2169 spin_lock_bh(&conn->state_lock);
2170 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2171 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2172
2173 atomic_set(&conn->conn_logout_remove, 1);
2174 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2175 iscsit_inc_conn_usage_count(conn);
2176
2177 spin_unlock_bh(&conn->state_lock);
2178 } else {
2179 /*
2180 * Handle all different cid CLOSECONNECTION requests in
2181 * iscsit_logout_post_handler_diffcid() as to give enough
2182 * time for any non immediate command's CmdSN to be
2183 * acknowledged on the connection in question.
2184 *
2185 * Here we simply make sure the CID is still around.
2186 */
2187 l_conn = iscsit_get_conn_from_cid(sess,
2188 cmd->logout_cid);
2189 if (!l_conn) {
2190 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2191 iscsit_add_cmd_to_response_queue(cmd, conn,
2192 cmd->i_state);
2193 return 0;
2194 }
2195
2196 iscsit_dec_conn_usage_count(l_conn);
2197 }
2198
2199 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2200
2201 return 0;
2202}
2203
2204int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2205{
2206 struct iscsi_session *sess = conn->sess;
2207
2208 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2209 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2210
2211 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2212 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213 " while ERL!=2.\n");
2214 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2215 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2216 return 0;
2217 }
2218
2219 if (conn->cid == cmd->logout_cid) {
2220 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2221 " with CID: %hu on CID: %hu, implementation error.\n",
2222 cmd->logout_cid, conn->cid);
2223 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2224 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2225 return 0;
2226 }
2227
2228 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2229
2230 return 0;
2231}
2232
3e1c81a9
NB		 2233int
2234iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2235 unsigned char *buf)
e48354ce
NB		 2236{
2237 int cmdsn_ret, logout_remove = 0;
2238 u8 reason_code = 0;
e48354ce
NB		 2239 struct iscsi_logout *hdr;
2240 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2241
2242 hdr = (struct iscsi_logout *) buf;
2243 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2244
2245 if (tiqn) {
2246 spin_lock(&tiqn->logout_stats.lock);
2247 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2248 tiqn->logout_stats.normal_logouts++;
2249 else
2250 tiqn->logout_stats.abnormal_logouts++;
2251 spin_unlock(&tiqn->logout_stats.lock);
2252 }
2253
2254 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2255 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2256 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2257 hdr->cid, conn->cid);
2258
2259 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2260 pr_err("Received logout request on connection that"
2261 " is not in logged in state, ignoring request.\n");
aafc9d15 2262 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2263 return 0;
2264 }
2265
e48354ce
NB		 2266 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2267 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2268 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2269 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2270 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2271 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2272 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2273 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2274 cmd->logout_reason = reason_code;
2275 cmd->data_direction = DMA_NONE;
2276
2277 /*
2278 * We need to sleep in these cases (by returning 1) until the Logout
2279 * Response gets sent in the tx thread.
2280 */
2281 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2282 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2283 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2284 logout_remove = 1;
2285
2286 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2287 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2288 spin_unlock_bh(&conn->cmd_lock);
2289
2290 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2291 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2292
2293 /*
2294 * Immediate commands are executed, well, immediately.
2295 * Non-Immediate Logout Commands are executed in CmdSN order.
2296 */
c6037cc5 2297 if (cmd->immediate_cmd) {
e48354ce
NB		 2298 int ret = iscsit_execute_cmd(cmd, 0);
2299
2300 if (ret < 0)
2301 return ret;
2302 } else {
561bf158 2303 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2304 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2305 logout_remove = 0;
ba159914
NB		 2306 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2307 return -1;
e48354ce
NB		 2308 }
2309
2310 return logout_remove;
2311}
3e1c81a9 2312EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2313
2314static int iscsit_handle_snack(
2315 struct iscsi_conn *conn,
2316 unsigned char *buf)
2317{
e48354ce
NB		 2318 struct iscsi_snack *hdr;
2319
2320 hdr = (struct iscsi_snack *) buf;
2321 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2322
2323 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2324 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2325 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2326 hdr->begrun, hdr->runlength, conn->cid);
2327
2328 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2329 pr_err("Initiator sent SNACK request while in"
2330 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2331 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2332 buf);
e48354ce
NB		 2333 }
2334 /*
2335 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2336 * call from inside iscsi_send_recovery_datain_or_r2t().
2337 */
2338 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2339 case 0:
2340 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2341 hdr->itt,
2342 be32_to_cpu(hdr->ttt),
2343 be32_to_cpu(hdr->begrun),
2344 be32_to_cpu(hdr->runlength));
e48354ce 2345 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2346 return iscsit_handle_status_snack(conn, hdr->itt,
2347 be32_to_cpu(hdr->ttt),
2348 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2349 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2350 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2351 be32_to_cpu(hdr->begrun),
2352 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2353 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2354 /* FIXME: Support R-Data SNACK */
2355 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2356 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2357 buf);
e48354ce
NB		 2358 default:
2359 pr_err("Unknown SNACK type 0x%02x, protocol"
2360 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2361 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2362 buf);
e48354ce
NB		 2363 }
2364
2365 return 0;
2366}
2367
2368static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2369{
2370 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2371 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2372 wait_for_completion_interruptible_timeout(
2373 &conn->rx_half_close_comp,
2374 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2375 }
2376}
2377
2378static int iscsit_handle_immediate_data(
2379 struct iscsi_cmd *cmd,
3e1c81a9 2380 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2381 u32 length)
2382{
2383 int iov_ret, rx_got = 0, rx_size = 0;
2384 u32 checksum, iov_count = 0, padding = 0;
2385 struct iscsi_conn *conn = cmd->conn;
2386 struct kvec *iov;
2387
2388 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2389 if (iov_ret < 0)
2390 return IMMEDIATE_DATA_CANNOT_RECOVER;
2391
2392 rx_size = length;
2393 iov_count = iov_ret;
2394 iov = &cmd->iov_data[0];
2395
2396 padding = ((-length) & 3);
2397 if (padding != 0) {
2398 iov[iov_count].iov_base = cmd->pad_bytes;
2399 iov[iov_count++].iov_len = padding;
2400 rx_size += padding;
2401 }
2402
2403 if (conn->conn_ops->DataDigest) {
2404 iov[iov_count].iov_base = &checksum;
2405 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2406 rx_size += ISCSI_CRC_LEN;
2407 }
2408
2409 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2410
2411 iscsit_unmap_iovec(cmd);
2412
2413 if (rx_got != rx_size) {
2414 iscsit_rx_thread_wait_for_tcp(conn);
2415 return IMMEDIATE_DATA_CANNOT_RECOVER;
2416 }
2417
2418 if (conn->conn_ops->DataDigest) {
2419 u32 data_crc;
2420
2421 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2422 cmd->write_data_done, length, padding,
2423 cmd->pad_bytes);
2424
2425 if (checksum != data_crc) {
2426 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2427 " does not match computed 0x%08x\n", checksum,
2428 data_crc);
2429
2430 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2431 pr_err("Unable to recover from"
2432 " Immediate Data digest failure while"
2433 " in ERL=0.\n");
ba159914 2434 iscsit_reject_cmd(cmd,
e48354ce 2435 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2436 (unsigned char *)hdr);
e48354ce
NB		 2437 return IMMEDIATE_DATA_CANNOT_RECOVER;
2438 } else {
ba159914 2439 iscsit_reject_cmd(cmd,
e48354ce 2440 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2441 (unsigned char *)hdr);
e48354ce
NB		 2442 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2443 }
2444 } else {
2445 pr_debug("Got CRC32C DataDigest 0x%08x for"
2446 " %u bytes of Immediate Data\n", checksum,
2447 length);
2448 }
2449 }
2450
2451 cmd->write_data_done += length;
2452
ebf1d95c 2453 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2454 spin_lock_bh(&cmd->istate_lock);
2455 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2456 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2457 spin_unlock_bh(&cmd->istate_lock);
2458 }
2459
2460 return IMMEDIATE_DATA_NORMAL_OPERATION;
2461}
2462
2463/*
2464 * Called with sess->conn_lock held.
2465 */
2466/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2467 with active network interface */
2468static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2469{
2470 struct iscsi_cmd *cmd;
2471 struct iscsi_conn *conn_p;
2472
2473 /*
2474 * Only send a Asynchronous Message on connections whos network
2475 * interface is still functional.
2476 */
2477 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2478 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2479 iscsit_inc_conn_usage_count(conn_p);
2480 break;
2481 }
2482 }
2483
2484 if (!conn_p)
2485 return;
2486
3c989d76 2487 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
e48354ce
NB		 2488 if (!cmd) {
2489 iscsit_dec_conn_usage_count(conn_p);
2490 return;
2491 }
2492
2493 cmd->logout_cid = conn->cid;
2494 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2495 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2496
2497 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2498 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2499 spin_unlock_bh(&conn_p->cmd_lock);
2500
2501 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2502 iscsit_dec_conn_usage_count(conn_p);
2503}
2504
2505static int iscsit_send_conn_drop_async_message(
2506 struct iscsi_cmd *cmd,
2507 struct iscsi_conn *conn)
2508{
2509 struct iscsi_async *hdr;
2510
2511 cmd->tx_size = ISCSI_HDR_LEN;
2512 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2513
2514 hdr = (struct iscsi_async *) cmd->pdu;
2515 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2516 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2517 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2518 cmd->targ_xfer_tag = 0xFFFFFFFF;
2519 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2520 cmd->stat_sn = conn->stat_sn++;
2521 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2523 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2524 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2525 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2526 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2527 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2528
2529 if (conn->conn_ops->HeaderDigest) {
2530 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2531
80690fdb
GU		 2532 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2533 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2534
2535 cmd->tx_size += ISCSI_CRC_LEN;
2536 pr_debug("Attaching CRC32C HeaderDigest to"
2537 " Async Message 0x%08x\n", *header_digest);
2538 }
2539
2540 cmd->iov_misc[0].iov_base = cmd->pdu;
2541 cmd->iov_misc[0].iov_len = cmd->tx_size;
2542 cmd->iov_misc_count = 1;
2543
2544 pr_debug("Sending Connection Dropped Async Message StatSN:"
2545 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2546 cmd->logout_cid, conn->cid);
2547 return 0;
2548}
2549
6f3c0e69
AG		 2550static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2551{
2552 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2553 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2554 wait_for_completion_interruptible_timeout(
2555 &conn->tx_half_close_comp,
2556 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2557 }
2558}
2559
2ec5a8c1
NB		 2560static void
2561iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2562 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2563 bool set_statsn)
e48354ce 2564{
2ec5a8c1
NB		 2565 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2566 hdr->flags = datain->flags;
2567 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2568 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2569 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2570 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2571 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2572 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2573 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2574 }
2575 }
2576 hton24(hdr->dlength, datain->length);
2577 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2578 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2579 (struct scsi_lun *)&hdr->lun);
2580 else
2581 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2582
2583 hdr->itt = cmd->init_task_tag;
2584
2585 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2586 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2587 else
2588 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2589 if (set_statsn)
2590 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2591 else
2592 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2593
2594 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2595 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2596 hdr->datasn = cpu_to_be32(datain->data_sn);
2597 hdr->offset = cpu_to_be32(datain->offset);
2598
2599 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2600 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2601 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2602 ntohl(hdr->offset), datain->length, conn->cid);
2603}
2604
2605static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2606{
2607 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2608 struct iscsi_datain datain;
2609 struct iscsi_datain_req *dr;
e48354ce 2610 struct kvec *iov;
2ec5a8c1
NB		 2611 u32 iov_count = 0, tx_size = 0;
2612 int eodr = 0, ret, iov_ret;
2613 bool set_statsn = false;
e48354ce
NB		 2614
2615 memset(&datain, 0, sizeof(struct iscsi_datain));
2616 dr = iscsit_get_datain_values(cmd, &datain);
2617 if (!dr) {
2618 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2619 cmd->init_task_tag);
2620 return -1;
2621 }
e48354ce
NB		 2622 /*
2623 * Be paranoid and double check the logic for now.
2624 */
ebf1d95c 2625 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2626 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2627 " datain.length: %u exceeds cmd->data_length: %u\n",
2628 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2629 cmd->se_cmd.data_length);
e48354ce
NB		 2630 return -1;
2631 }
2632
2633 spin_lock_bh(&conn->sess->session_stats_lock);
2634 conn->sess->tx_data_octets += datain.length;
2635 if (conn->sess->se_sess->se_node_acl) {
2636 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2637 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2638 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2639 }
2640 spin_unlock_bh(&conn->sess->session_stats_lock);
2641 /*
2642 * Special case for successfully execution w/ both DATAIN
2643 * and Sense Data.
2644 */
2645 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2646 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2647 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2648 else {
2649 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2650 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2651 iscsit_increment_maxcmdsn(cmd, conn->sess);
2652 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2653 set_statsn = true;
e48354ce 2654 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2655 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2656 set_statsn = true;
e48354ce
NB		 2657 }
2658
2ec5a8c1 2659 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2660
2661 iov = &cmd->iov_data[0];
2662 iov[iov_count].iov_base = cmd->pdu;
2663 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2664 tx_size += ISCSI_HDR_LEN;
2665
2666 if (conn->conn_ops->HeaderDigest) {
2667 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2668
80690fdb
GU		 2669 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2670 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2671
2672 iov[0].iov_len += ISCSI_CRC_LEN;
2673 tx_size += ISCSI_CRC_LEN;
2674
2675 pr_debug("Attaching CRC32 HeaderDigest"
2676 " for DataIN PDU 0x%08x\n", *header_digest);
2677 }
2678
2ec5a8c1
NB		 2679 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2680 datain.offset, datain.length);
e48354ce
NB		 2681 if (iov_ret < 0)
2682 return -1;
2683
2684 iov_count += iov_ret;
2685 tx_size += datain.length;
2686
2687 cmd->padding = ((-datain.length) & 3);
2688 if (cmd->padding) {
2689 iov[iov_count].iov_base = cmd->pad_bytes;
2690 iov[iov_count++].iov_len = cmd->padding;
2691 tx_size += cmd->padding;
2692
2693 pr_debug("Attaching %u padding bytes\n",
2694 cmd->padding);
2695 }
2696 if (conn->conn_ops->DataDigest) {
2697 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2698 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2699
2700 iov[iov_count].iov_base = &cmd->data_crc;
2701 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2702 tx_size += ISCSI_CRC_LEN;
2703
2704 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2705 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2706 }
2707
2708 cmd->iov_data_count = iov_count;
2709 cmd->tx_size = tx_size;
2710
6f3c0e69
AG		 2711 /* sendpage is preferred but can't insert markers */
2712 if (!conn->conn_ops->IFMarker)
2713 ret = iscsit_fe_sendpage_sg(cmd, conn);
2714 else
2715 ret = iscsit_send_tx_data(cmd, conn, 0);
2716
2717 iscsit_unmap_iovec(cmd);
2718
2719 if (ret < 0) {
2720 iscsit_tx_thread_wait_for_tcp(conn);
2721 return ret;
2722 }
2723
e48354ce 2724 if (dr->dr_complete) {
6f3c0e69 2725 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2726 2 : 1;
2727 iscsit_free_datain_req(cmd, dr);
2728 }
2729
6f3c0e69 2730 return eodr;
e48354ce
NB		 2731}
2732
2ec5a8c1
NB		 2733int
2734iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2735 struct iscsi_logout_rsp *hdr)
e48354ce 2736{
e48354ce
NB		 2737 struct iscsi_conn *logout_conn = NULL;
2738 struct iscsi_conn_recovery *cr = NULL;
2739 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2740 /*
2741 * The actual shutting down of Sessions and/or Connections
2742 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2743 * is done in scsi_logout_post_handler().
2744 */
2745 switch (cmd->logout_reason) {
2746 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2747 pr_debug("iSCSI session logout successful, setting"
2748 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2749 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2750 break;
2751 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2752 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2753 break;
2754 /*
2755 * For CLOSECONNECTION logout requests carrying
2756 * a matching logout CID -> local CID, the reference
2757 * for the local CID will have been incremented in
2758 * iscsi_logout_closeconnection().
2759 *
2760 * For CLOSECONNECTION logout requests carrying
2761 * a different CID than the connection it arrived
2762 * on, the connection responding to cmd->logout_cid
2763 * is stopped in iscsit_logout_post_handler_diffcid().
2764 */
2765
2766 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2767 " successful.\n", cmd->logout_cid, conn->cid);
2768 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2769 break;
2770 case ISCSI_LOGOUT_REASON_RECOVERY:
2771 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2772 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2773 break;
2774 /*
2775 * If the connection is still active from our point of view
2776 * force connection recovery to occur.
2777 */
2778 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2779 cmd->logout_cid);
ee1b1b9c 2780 if (logout_conn) {
e48354ce
NB		 2781 iscsit_connection_reinstatement_rcfr(logout_conn);
2782 iscsit_dec_conn_usage_count(logout_conn);
2783 }
2784
2785 cr = iscsit_get_inactive_connection_recovery_entry(
2786 conn->sess, cmd->logout_cid);
2787 if (!cr) {
2788 pr_err("Unable to locate CID: %hu for"
2789 " REMOVECONNFORRECOVERY Logout Request.\n",
2790 cmd->logout_cid);
2791 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2792 break;
2793 }
2794
2795 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2796
2797 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2798 " for recovery for CID: %hu on CID: %hu successful.\n",
2799 cmd->logout_cid, conn->cid);
2800 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2801 break;
2802 default:
2803 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2804 cmd->logout_reason);
2805 return -1;
2806 }
2807
e48354ce
NB		 2808 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2809 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2810 hdr->response = cmd->logout_response;
66c7db68 2811 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2812 cmd->stat_sn = conn->stat_sn++;
2813 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2814
2815 iscsit_increment_maxcmdsn(cmd, conn->sess);
2816 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2817 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2818
2ec5a8c1
NB		 2819 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2820 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2821 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2822 cmd->logout_cid, conn->cid);
2823
2824 return 0;
2825}
2826EXPORT_SYMBOL(iscsit_build_logout_rsp);
2827
2828static int
2829iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2830{
2831 struct kvec *iov;
2832 int niov = 0, tx_size, rc;
2833
2834 rc = iscsit_build_logout_rsp(cmd, conn,
2835 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2836 if (rc < 0)
2837 return rc;
2838
2839 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2840 iov = &cmd->iov_misc[0];
2841 iov[niov].iov_base = cmd->pdu;
2842 iov[niov++].iov_len = ISCSI_HDR_LEN;
2843
2844 if (conn->conn_ops->HeaderDigest) {
2845 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2846
80690fdb
GU		 2847 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2848 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2849
2850 iov[0].iov_len += ISCSI_CRC_LEN;
2851 tx_size += ISCSI_CRC_LEN;
2852 pr_debug("Attaching CRC32C HeaderDigest to"
2853 " Logout Response 0x%08x\n", *header_digest);
2854 }
2855 cmd->iov_misc_count = niov;
2856 cmd->tx_size = tx_size;
2857
e48354ce
NB		 2858 return 0;
2859}
2860
2ec5a8c1
NB		 2861void
2862iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2863 struct iscsi_nopin *hdr, bool nopout_response)
2864{
2865 hdr->opcode = ISCSI_OP_NOOP_IN;
2866 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2867 hton24(hdr->dlength, cmd->buf_ptr_size);
2868 if (nopout_response)
2869 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2870 hdr->itt = cmd->init_task_tag;
2871 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2872 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2873 conn->stat_sn;
2874 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2875
2876 if (nopout_response)
2877 iscsit_increment_maxcmdsn(cmd, conn->sess);
2878
2879 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2880 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2881
2882 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2883 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2884 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2885 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2886}
2887EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2888
e48354ce
NB		 2889/*
2890 * Unsolicited NOPIN, either requesting a response or not.
2891 */
2892static int iscsit_send_unsolicited_nopin(
2893 struct iscsi_cmd *cmd,
2894 struct iscsi_conn *conn,
2895 int want_response)
2896{
2ec5a8c1
NB		 2897 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2898 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2899
2ec5a8c1 2900 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2901
2902 if (conn->conn_ops->HeaderDigest) {
2903 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2904
80690fdb
GU		 2905 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2906 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2907
2908 tx_size += ISCSI_CRC_LEN;
2909 pr_debug("Attaching CRC32C HeaderDigest to"
2910 " NopIN 0x%08x\n", *header_digest);
2911 }
2912
2913 cmd->iov_misc[0].iov_base = cmd->pdu;
2914 cmd->iov_misc[0].iov_len = tx_size;
2915 cmd->iov_misc_count = 1;
2916 cmd->tx_size = tx_size;
2917
2918 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2919 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2920
6f3c0e69
AG		 2921 ret = iscsit_send_tx_data(cmd, conn, 1);
2922 if (ret < 0) {
2923 iscsit_tx_thread_wait_for_tcp(conn);
2924 return ret;
2925 }
2926
2927 spin_lock_bh(&cmd->istate_lock);
2928 cmd->i_state = want_response ?
2929 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2930 spin_unlock_bh(&cmd->istate_lock);
2931
e48354ce
NB		 2932 return 0;
2933}
2934
2ec5a8c1
NB		 2935static int
2936iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2937{
2ec5a8c1 2938 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2939 struct kvec *iov;
2ec5a8c1
NB		 2940 u32 padding = 0;
2941 int niov = 0, tx_size;
e48354ce 2942
2ec5a8c1 2943 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2944
2ec5a8c1 2945 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2946 iov = &cmd->iov_misc[0];
2947 iov[niov].iov_base = cmd->pdu;
2948 iov[niov++].iov_len = ISCSI_HDR_LEN;
2949
2950 if (conn->conn_ops->HeaderDigest) {
2951 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2952
80690fdb
GU		 2953 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2954 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2955
2956 iov[0].iov_len += ISCSI_CRC_LEN;
2957 tx_size += ISCSI_CRC_LEN;
2958 pr_debug("Attaching CRC32C HeaderDigest"
2959 " to NopIn 0x%08x\n", *header_digest);
2960 }
2961
2962 /*
2963 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2964 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2965 */
2966 if (cmd->buf_ptr_size) {
2967 iov[niov].iov_base = cmd->buf_ptr;
2968 iov[niov++].iov_len = cmd->buf_ptr_size;
2969 tx_size += cmd->buf_ptr_size;
2970
2971 pr_debug("Echoing back %u bytes of ping"
2972 " data.\n", cmd->buf_ptr_size);
2973
2974 padding = ((-cmd->buf_ptr_size) & 3);
2975 if (padding != 0) {
2976 iov[niov].iov_base = &cmd->pad_bytes;
2977 iov[niov++].iov_len = padding;
2978 tx_size += padding;
2979 pr_debug("Attaching %u additional"
2980 " padding bytes.\n", padding);
2981 }
2982 if (conn->conn_ops->DataDigest) {
2983 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2984 cmd->buf_ptr, cmd->buf_ptr_size,
2985 padding, (u8 *)&cmd->pad_bytes,
2986 (u8 *)&cmd->data_crc);
2987
2988 iov[niov].iov_base = &cmd->data_crc;
2989 iov[niov++].iov_len = ISCSI_CRC_LEN;
2990 tx_size += ISCSI_CRC_LEN;
2991 pr_debug("Attached DataDigest for %u"
2992 " bytes of ping data, CRC 0x%08x\n",
2993 cmd->buf_ptr_size, cmd->data_crc);
2994 }
2995 }
2996
2997 cmd->iov_misc_count = niov;
2998 cmd->tx_size = tx_size;
2999
e48354ce
NB		 3000 return 0;
3001}
3002
6f3c0e69 3003static int iscsit_send_r2t(
e48354ce
NB		 3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn)
3006{
3007 int tx_size = 0;
3008 struct iscsi_r2t *r2t;
3009 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3010 int ret;
e48354ce
NB		 3011
3012 r2t = iscsit_get_r2t_from_list(cmd);
3013 if (!r2t)
3014 return -1;
3015
3016 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3017 memset(hdr, 0, ISCSI_HDR_LEN);
3018 hdr->opcode = ISCSI_OP_R2T;
3019 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3020 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3021 (struct scsi_lun *)&hdr->lun);
66c7db68 3022 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3023 spin_lock_bh(&conn->sess->ttt_lock);
3024 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3025 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3026 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027 spin_unlock_bh(&conn->sess->ttt_lock);
3028 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3029 hdr->statsn = cpu_to_be32(conn->stat_sn);
3030 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3031 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3032 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3033 hdr->data_offset = cpu_to_be32(r2t->offset);
3034 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3035
3036 cmd->iov_misc[0].iov_base = cmd->pdu;
3037 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3038 tx_size += ISCSI_HDR_LEN;
3039
3040 if (conn->conn_ops->HeaderDigest) {
3041 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3042
80690fdb
GU		 3043 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3044 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3045
3046 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3047 tx_size += ISCSI_CRC_LEN;
3048 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3049 " PDU 0x%08x\n", *header_digest);
3050 }
3051
3052 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3053 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3054 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3055 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3056 r2t->offset, r2t->xfer_len, conn->cid);
3057
3058 cmd->iov_misc_count = 1;
3059 cmd->tx_size = tx_size;
3060
3061 spin_lock_bh(&cmd->r2t_lock);
3062 r2t->sent_r2t = 1;
3063 spin_unlock_bh(&cmd->r2t_lock);
3064
6f3c0e69
AG		 3065 ret = iscsit_send_tx_data(cmd, conn, 1);
3066 if (ret < 0) {
3067 iscsit_tx_thread_wait_for_tcp(conn);
3068 return ret;
3069 }
3070
3071 spin_lock_bh(&cmd->dataout_timeout_lock);
3072 iscsit_start_dataout_timer(cmd, conn);
3073 spin_unlock_bh(&cmd->dataout_timeout_lock);
3074
e48354ce
NB		 3075 return 0;
3076}
3077
3078/*
8b1e1244
AG		 3079 * @recovery: If called from iscsi_task_reassign_complete_write() for
3080 * connection recovery.
e48354ce
NB		 3081 */
3082int iscsit_build_r2ts_for_cmd(
e48354ce 3083 struct iscsi_conn *conn,
3e1c81a9 3084 struct iscsi_cmd *cmd,
8b1e1244 3085 bool recovery)
e48354ce
NB		 3086{
3087 int first_r2t = 1;
3088 u32 offset = 0, xfer_len = 0;
3089
3090 spin_lock_bh(&cmd->r2t_lock);
3091 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3092 spin_unlock_bh(&cmd->r2t_lock);
3093 return 0;
3094 }
3095
8b1e1244
AG		 3096 if (conn->sess->sess_ops->DataSequenceInOrder &&
3097 !recovery)
c6037cc5 3098 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3099
3100 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3101 if (conn->sess->sess_ops->DataSequenceInOrder) {
3102 offset = cmd->r2t_offset;
3103
8b1e1244
AG		 3104 if (first_r2t && recovery) {
3105 int new_data_end = offset +
3106 conn->sess->sess_ops->MaxBurstLength -
3107 cmd->next_burst_len;
3108
ebf1d95c
AG		 3109 if (new_data_end > cmd->se_cmd.data_length)
3110 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3111 else
3112 xfer_len =
3113 conn->sess->sess_ops->MaxBurstLength -
3114 cmd->next_burst_len;
e48354ce 3115 } else {
8b1e1244
AG		 3116 int new_data_end = offset +
3117 conn->sess->sess_ops->MaxBurstLength;
3118
ebf1d95c
AG		 3119 if (new_data_end > cmd->se_cmd.data_length)
3120 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3121 else
3122 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3123 }
3124 cmd->r2t_offset += xfer_len;
3125
ebf1d95c 3126 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3127 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3128 } else {
3129 struct iscsi_seq *seq;
3130
3131 seq = iscsit_get_seq_holder_for_r2t(cmd);
3132 if (!seq) {
3133 spin_unlock_bh(&cmd->r2t_lock);
3134 return -1;
3135 }
3136
3137 offset = seq->offset;
3138 xfer_len = seq->xfer_len;
3139
3140 if (cmd->seq_send_order == cmd->seq_count)
3141 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3142 }
3143 cmd->outstanding_r2ts++;
3144 first_r2t = 0;
3145
3146 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3147 spin_unlock_bh(&cmd->r2t_lock);
3148 return -1;
3149 }
3150
3151 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3152 break;
3153 }
3154 spin_unlock_bh(&cmd->r2t_lock);
3155
3156 return 0;
3157}
3158
2ec5a8c1
NB		 3159void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3160 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3161{
2ec5a8c1 3162 if (inc_stat_sn)
e48354ce
NB		 3163 cmd->stat_sn = conn->stat_sn++;
3164
3165 spin_lock_bh(&conn->sess->session_stats_lock);
3166 conn->sess->rsp_pdus++;
3167 spin_unlock_bh(&conn->sess->session_stats_lock);
3168
e48354ce
NB		 3169 memset(hdr, 0, ISCSI_HDR_LEN);
3170 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3171 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3172 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3173 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3174 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3175 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3176 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3177 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3178 }
3179 hdr->response = cmd->iscsi_response;
3180 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3181 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3182 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3183
3184 iscsit_increment_maxcmdsn(cmd, conn->sess);
3185 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3186 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3187
2ec5a8c1
NB		 3188 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3189 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3190 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3191 cmd->se_cmd.scsi_status, conn->cid);
3192}
3193EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3194
3195static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3196{
3197 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3198 struct kvec *iov;
3199 u32 padding = 0, tx_size = 0;
3200 int iov_count = 0;
3201 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3202
3203 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3204
e48354ce
NB		 3205 iov = &cmd->iov_misc[0];
3206 iov[iov_count].iov_base = cmd->pdu;
3207 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3208 tx_size += ISCSI_HDR_LEN;
3209
3210 /*
3211 * Attach SENSE DATA payload to iSCSI Response PDU
3212 */
3213 if (cmd->se_cmd.sense_buffer &&
3214 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3215 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3216 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3217 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3218
e48354ce 3219 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3220 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3221 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3222 iov[iov_count++].iov_len =
3223 (cmd->se_cmd.scsi_sense_length + padding);
3224 tx_size += cmd->se_cmd.scsi_sense_length;
3225
3226 if (padding) {
9c58b7dd 3227 memset(cmd->sense_buffer +
e48354ce
NB		 3228 cmd->se_cmd.scsi_sense_length, 0, padding);
3229 tx_size += padding;
3230 pr_debug("Adding %u bytes of padding to"
3231 " SENSE.\n", padding);
3232 }
3233
3234 if (conn->conn_ops->DataDigest) {
3235 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3236 cmd->sense_buffer,
e48354ce
NB		 3237 (cmd->se_cmd.scsi_sense_length + padding),
3238 0, NULL, (u8 *)&cmd->data_crc);
3239
3240 iov[iov_count].iov_base = &cmd->data_crc;
3241 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3242 tx_size += ISCSI_CRC_LEN;
3243
3244 pr_debug("Attaching CRC32 DataDigest for"
3245 " SENSE, %u bytes CRC 0x%08x\n",
3246 (cmd->se_cmd.scsi_sense_length + padding),
3247 cmd->data_crc);
3248 }
3249
3250 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3251 " Response PDU\n",
3252 cmd->se_cmd.scsi_sense_length);
3253 }
3254
3255 if (conn->conn_ops->HeaderDigest) {
3256 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3257
80690fdb
GU		 3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3259 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3260
3261 iov[0].iov_len += ISCSI_CRC_LEN;
3262 tx_size += ISCSI_CRC_LEN;
3263 pr_debug("Attaching CRC32 HeaderDigest for Response"
3264 " PDU 0x%08x\n", *header_digest);
3265 }
3266
3267 cmd->iov_misc_count = iov_count;
3268 cmd->tx_size = tx_size;
3269
e48354ce
NB		 3270 return 0;
3271}
3272
3273static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3274{
3275 switch (se_tmr->response) {
3276 case TMR_FUNCTION_COMPLETE:
3277 return ISCSI_TMF_RSP_COMPLETE;
3278 case TMR_TASK_DOES_NOT_EXIST:
3279 return ISCSI_TMF_RSP_NO_TASK;
3280 case TMR_LUN_DOES_NOT_EXIST:
3281 return ISCSI_TMF_RSP_NO_LUN;
3282 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3283 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3284 case TMR_FUNCTION_REJECTED:
3285 default:
3286 return ISCSI_TMF_RSP_REJECTED;
3287 }
3288}
3289
2ec5a8c1
NB		 3290void
3291iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3292 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3293{
3294 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3295
e48354ce 3296 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3297 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3298 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3299 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3300 cmd->stat_sn = conn->stat_sn++;
3301 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3302
3303 iscsit_increment_maxcmdsn(cmd, conn->sess);
3304 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3305 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3306
2ec5a8c1
NB		 3307 pr_debug("Built Task Management Response ITT: 0x%08x,"
3308 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3309 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3310}
3311EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3312
3313static int
3314iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3315{
3316 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3317 u32 tx_size = 0;
3318
3319 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3320
e48354ce
NB		 3321 cmd->iov_misc[0].iov_base = cmd->pdu;
3322 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3323 tx_size += ISCSI_HDR_LEN;
3324
3325 if (conn->conn_ops->HeaderDigest) {
3326 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3327
80690fdb
GU		 3328 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3329 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3330
3331 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3332 tx_size += ISCSI_CRC_LEN;
3333 pr_debug("Attaching CRC32 HeaderDigest for Task"
3334 " Mgmt Response PDU 0x%08x\n", *header_digest);
3335 }
3336
3337 cmd->iov_misc_count = 1;
3338 cmd->tx_size = tx_size;
3339
e48354ce
NB		 3340 return 0;
3341}
3342
2f9bc894
NB		 3343static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3344{
3345 bool ret = false;
3346
3347 if (np->np_sockaddr.ss_family == AF_INET6) {
3348 const struct sockaddr_in6 sin6 = {
3349 .sin6_addr = IN6ADDR_ANY_INIT };
3350 struct sockaddr_in6 *sock_in6 =
3351 (struct sockaddr_in6 *)&np->np_sockaddr;
3352
3353 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3354 sin6.sin6_addr.s6_addr, 16))
3355 ret = true;
3356 } else {
3357 struct sockaddr_in * sock_in =
3358 (struct sockaddr_in *)&np->np_sockaddr;
3359
cea0b4ce 3360 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3361 ret = true;
3362 }
3363
3364 return ret;
3365}
3366
8b1e1244
AG		 3367#define SENDTARGETS_BUF_LIMIT 32768U
3368
e48354ce
NB		 3369static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3370{
3371 char *payload = NULL;
3372 struct iscsi_conn *conn = cmd->conn;
3373 struct iscsi_portal_group *tpg;
3374 struct iscsi_tiqn *tiqn;
3375 struct iscsi_tpg_np *tpg_np;
3376 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
8b1e1244 3377 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3378 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
e48354ce 3379
8b1e1244
AG		 3380 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3381 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3382
3383 payload = kzalloc(buffer_len, GFP_KERNEL);
3384 if (!payload) {
3385 pr_err("Unable to allocate memory for sendtargets"
3386 " response.\n");
3387 return -ENOMEM;
3388 }
6665889c
NB		 3389 /*
3390 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3391 * explicit case..
3392 */
3393 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3394 text_ptr = strchr(text_in, '=');
3395 if (!text_ptr) {
3396 pr_err("Unable to locate '=' string in text_in:"
3397 " %s\n", text_in);
4f45d320 3398 kfree(payload);
6665889c
NB		 3399 return -EINVAL;
3400 }
3401 /*
3402 * Skip over '=' character..
3403 */
3404 text_ptr += 1;
3405 }
e48354ce
NB		 3406
3407 spin_lock(&tiqn_lock);
3408 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
6665889c
NB		 3409 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3410 strcmp(tiqn->tiqn, text_ptr)) {
3411 continue;
3412 }
3413
e48354ce
NB		 3414 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3415 len += 1;
3416
3417 if ((len + payload_len) > buffer_len) {
e48354ce
NB		 3418 end_of_buf = 1;
3419 goto eob;
3420 }
8359cf43 3421 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3422 payload_len += len;
3423
3424 spin_lock(&tiqn->tiqn_tpg_lock);
3425 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3426
3427 spin_lock(&tpg->tpg_state_lock);
3428 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3429 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3430 spin_unlock(&tpg->tpg_state_lock);
3431 continue;
3432 }
3433 spin_unlock(&tpg->tpg_state_lock);
3434
3435 spin_lock(&tpg->tpg_np_lock);
3436 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3437 tpg_np_list) {
2f9bc894
NB		 3438 struct iscsi_np *np = tpg_np->tpg_np;
3439 bool inaddr_any = iscsit_check_inaddr_any(np);
3440
e48354ce 3441 len = sprintf(buf, "TargetAddress="
dfecf611
CL		 3442 "%s:%hu,%hu",
3443 (inaddr_any == false) ?
2f9bc894 3444 np->np_ip : conn->local_ip,
dfecf611 3445 (inaddr_any == false) ?
2f9bc894 3446 np->np_port : conn->local_port,
e48354ce
NB		 3447 tpg->tpgt);
3448 len += 1;
3449
3450 if ((len + payload_len) > buffer_len) {
3451 spin_unlock(&tpg->tpg_np_lock);
3452 spin_unlock(&tiqn->tiqn_tpg_lock);
3453 end_of_buf = 1;
3454 goto eob;
3455 }
8359cf43 3456 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3457 payload_len += len;
3458 }
3459 spin_unlock(&tpg->tpg_np_lock);
3460 }
3461 spin_unlock(&tiqn->tiqn_tpg_lock);
3462eob:
3463 if (end_of_buf)
3464 break;
6665889c
NB		 3465
3466 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3467 break;
e48354ce
NB		 3468 }
3469 spin_unlock(&tiqn_lock);
3470
3471 cmd->buf_ptr = payload;
3472
3473 return payload_len;
3474}
3475
889c8a68
NB		 3476int
3477iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3478 struct iscsi_text_rsp *hdr)
e48354ce 3479{
889c8a68 3480 int text_length, padding;
e48354ce
NB		 3481
3482 text_length = iscsit_build_sendtargets_response(cmd);
3483 if (text_length < 0)
3484 return text_length;
3485
889c8a68
NB		 3486 hdr->opcode = ISCSI_OP_TEXT_RSP;
3487 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
e48354ce 3488 padding = ((-text_length) & 3);
e48354ce 3489 hton24(hdr->dlength, text_length);
889c8a68
NB		 3490 hdr->itt = cmd->init_task_tag;
3491 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3492 cmd->stat_sn = conn->stat_sn++;
3493 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3494
3495 iscsit_increment_maxcmdsn(cmd, conn->sess);
889c8a68
NB		 3496 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3497 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
e48354ce 3498
889c8a68
NB		 3499 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3500 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3501 text_length, conn->cid);
3502
3503 return text_length + padding;
3504}
3505EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3506
889c8a68
NB		 3507/*
3508 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3509 * MaxRecvDataSegmentLength.
3510 */
3511static int iscsit_send_text_rsp(
3512 struct iscsi_cmd *cmd,
3513 struct iscsi_conn *conn)
3514{
3515 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3516 struct kvec *iov;
3517 u32 tx_size = 0;
3518 int text_length, iov_count = 0, rc;
3519
3520 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3521 if (rc < 0)
3522 return rc;
3523
3524 text_length = rc;
3525 iov = &cmd->iov_misc[0];
e48354ce
NB		 3526 iov[iov_count].iov_base = cmd->pdu;
3527 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3528 iov[iov_count].iov_base = cmd->buf_ptr;
889c8a68 3529 iov[iov_count++].iov_len = text_length;
e48354ce 3530
889c8a68 3531 tx_size += (ISCSI_HDR_LEN + text_length);
e48354ce
NB		 3532
3533 if (conn->conn_ops->HeaderDigest) {
3534 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3535
80690fdb
GU		 3536 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3537 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3538
3539 iov[0].iov_len += ISCSI_CRC_LEN;
3540 tx_size += ISCSI_CRC_LEN;
3541 pr_debug("Attaching CRC32 HeaderDigest for"
3542 " Text Response PDU 0x%08x\n", *header_digest);
3543 }
3544
3545 if (conn->conn_ops->DataDigest) {
3546 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
889c8a68 3547 cmd->buf_ptr, text_length,
e48354ce
NB		 3548 0, NULL, (u8 *)&cmd->data_crc);
3549
3550 iov[iov_count].iov_base = &cmd->data_crc;
3551 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3552 tx_size += ISCSI_CRC_LEN;
3553
3554 pr_debug("Attaching DataDigest for %u bytes of text"
889c8a68 3555 " data, CRC 0x%08x\n", text_length,
e48354ce
NB		 3556 cmd->data_crc);
3557 }
3558
3559 cmd->iov_misc_count = iov_count;
3560 cmd->tx_size = tx_size;
3561
e48354ce
NB		 3562 return 0;
3563}
3564
2ec5a8c1
NB		 3565void
3566iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3567 struct iscsi_reject *hdr)
3568{
3569 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3570 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3571 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3572 hton24(hdr->dlength, ISCSI_HDR_LEN);
3573 hdr->ffffffff = cpu_to_be32(0xffffffff);
3574 cmd->stat_sn = conn->stat_sn++;
3575 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3576 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3577 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3578
3579}
3580EXPORT_SYMBOL(iscsit_build_reject);
3581
e48354ce
NB		 3582static int iscsit_send_reject(
3583 struct iscsi_cmd *cmd,
3584 struct iscsi_conn *conn)
3585{
bfbdb31d 3586 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3587 struct kvec *iov;
bfbdb31d 3588 u32 iov_count = 0, tx_size;
e48354ce 3589
bfbdb31d 3590 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3591
3592 iov = &cmd->iov_misc[0];
e48354ce
NB		 3593 iov[iov_count].iov_base = cmd->pdu;
3594 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3595 iov[iov_count].iov_base = cmd->buf_ptr;
3596 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3597
3598 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3599
3600 if (conn->conn_ops->HeaderDigest) {
3601 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3602
80690fdb
GU		 3603 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3604 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3605
3606 iov[0].iov_len += ISCSI_CRC_LEN;
3607 tx_size += ISCSI_CRC_LEN;
3608 pr_debug("Attaching CRC32 HeaderDigest for"
3609 " REJECT PDU 0x%08x\n", *header_digest);
3610 }
3611
3612 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3613 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3614 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3615
3616 iov[iov_count].iov_base = &cmd->data_crc;
3617 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3618 tx_size += ISCSI_CRC_LEN;
3619 pr_debug("Attaching CRC32 DataDigest for REJECT"
3620 " PDU 0x%08x\n", cmd->data_crc);
3621 }
3622
3623 cmd->iov_misc_count = iov_count;
3624 cmd->tx_size = tx_size;
3625
3626 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3627 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3628
3629 return 0;
3630}
3631
e48354ce
NB		 3632void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3633{
3634 struct iscsi_thread_set *ts = conn->thread_set;
3635 int ord, cpu;
3636 /*
3637 * thread_id is assigned from iscsit_global->ts_bitmap from
3638 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3639 *
3640 * Here we use thread_id to determine which CPU that this
3641 * iSCSI connection's iscsi_thread_set will be scheduled to
3642 * execute upon.
3643 */
3644 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3645 for_each_online_cpu(cpu) {
3646 if (ord-- == 0) {
3647 cpumask_set_cpu(cpu, conn->conn_cpumask);
3648 return;
3649 }
3650 }
3651 /*
3652 * This should never be reached..
3653 */
3654 dump_stack();
3655 cpumask_setall(conn->conn_cpumask);
3656}
3657
3658static inline void iscsit_thread_check_cpumask(
3659 struct iscsi_conn *conn,
3660 struct task_struct *p,
3661 int mode)
3662{
3663 char buf[128];
3664 /*
3665 * mode == 1 signals iscsi_target_tx_thread() usage.
3666 * mode == 0 signals iscsi_target_rx_thread() usage.
3667 */
3668 if (mode == 1) {
3669 if (!conn->conn_tx_reset_cpumask)
3670 return;
3671 conn->conn_tx_reset_cpumask = 0;
3672 } else {
3673 if (!conn->conn_rx_reset_cpumask)
3674 return;
3675 conn->conn_rx_reset_cpumask = 0;
3676 }
3677 /*
3678 * Update the CPU mask for this single kthread so that
3679 * both TX and RX kthreads are scheduled to run on the
3680 * same CPU.
3681 */
3682 memset(buf, 0, 128);
3683 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3684 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3685}
3686
2ec5a8c1
NB		 3687static int
3688iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3689{
6f3c0e69
AG		 3690 int ret;
3691
2ec5a8c1
NB		 3692 switch (state) {
3693 case ISTATE_SEND_R2T:
3694 ret = iscsit_send_r2t(cmd, conn);
3695 if (ret < 0)
3696 goto err;
3697 break;
3698 case ISTATE_REMOVE:
3699 spin_lock_bh(&conn->cmd_lock);
3700 list_del(&cmd->i_conn_node);
3701 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3702
aafc9d15 3703 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3704 break;
3705 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3706 iscsit_mod_nopin_response_timer(conn);
3707 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3708 if (ret < 0)
6f3c0e69 3709 goto err;
2ec5a8c1
NB		 3710 break;
3711 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3712 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3713 if (ret < 0)
3714 goto err;
3715 break;
3716 default:
3717 pr_err("Unknown Opcode: 0x%02x ITT:"
3718 " 0x%08x, i_state: %d on CID: %hu\n",
3719 cmd->iscsi_opcode, cmd->init_task_tag, state,
3720 conn->cid);
3721 goto err;
6f3c0e69
AG		 3722 }
3723
3724 return 0;
3725
3726err:
3727 return -1;
3728}
3729
2ec5a8c1
NB		 3730static int
3731iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3732{
2ec5a8c1 3733 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3734 struct iscsi_queue_req *qr;
3735 struct iscsi_cmd *cmd;
3736 u8 state;
3737 int ret;
3738
2ec5a8c1
NB		 3739 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3740 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3741 cmd = qr->cmd;
3742 state = qr->state;
3743 kmem_cache_free(lio_qr_cache, qr);
3744
2ec5a8c1
NB		 3745 ret = t->iscsit_immediate_queue(conn, cmd, state);
3746 if (ret < 0)
3747 return ret;
3748 }
fd3a9025 3749
2ec5a8c1
NB		 3750 return 0;
3751}
6f3c0e69 3752
2ec5a8c1
NB		 3753static int
3754iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3755{
3756 int ret;
3757
3758check_rsp_state:
3759 switch (state) {
3760 case ISTATE_SEND_DATAIN:
3761 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3762 if (ret < 0)
3763 goto err;
2ec5a8c1
NB		 3764 else if (!ret)
3765 /* more drs */
3766 goto check_rsp_state;
3767 else if (ret == 1) {
3768 /* all done */
3769 spin_lock_bh(&cmd->istate_lock);
3770 cmd->i_state = ISTATE_SENT_STATUS;
3771 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3772
2ec5a8c1
NB		 3773 if (atomic_read(&conn->check_immediate_queue))
3774 return 1;
6f3c0e69 3775
2ec5a8c1
NB		 3776 return 0;
3777 } else if (ret == 2) {
3778 /* Still must send status,
3779 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3780 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3781 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3782 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3783 state = ISTATE_SEND_STATUS;
3784 goto check_rsp_state;
3785 }
3786
3787 break;
3788 case ISTATE_SEND_STATUS:
3789 case ISTATE_SEND_STATUS_RECOVERY:
3790 ret = iscsit_send_response(cmd, conn);
3791 break;
3792 case ISTATE_SEND_LOGOUTRSP:
3793 ret = iscsit_send_logout(cmd, conn);
3794 break;
3795 case ISTATE_SEND_ASYNCMSG:
3796 ret = iscsit_send_conn_drop_async_message(
3797 cmd, conn);
3798 break;
3799 case ISTATE_SEND_NOPIN:
3800 ret = iscsit_send_nopin(cmd, conn);
3801 break;
3802 case ISTATE_SEND_REJECT:
3803 ret = iscsit_send_reject(cmd, conn);
3804 break;
3805 case ISTATE_SEND_TASKMGTRSP:
3806 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3807 if (ret != 0)
6f3c0e69 3808 break;
2ec5a8c1
NB		 3809 ret = iscsit_tmr_post_handler(cmd, conn);
3810 if (ret != 0)
3811 iscsit_fall_back_to_erl0(conn->sess);
3812 break;
3813 case ISTATE_SEND_TEXTRSP:
3814 ret = iscsit_send_text_rsp(cmd, conn);
3815 break;
3816 default:
3817 pr_err("Unknown Opcode: 0x%02x ITT:"
3818 " 0x%08x, i_state: %d on CID: %hu\n",
3819 cmd->iscsi_opcode, cmd->init_task_tag,
3820 state, conn->cid);
3821 goto err;
3822 }
3823 if (ret < 0)
3824 goto err;
3825
3826 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3827 iscsit_tx_thread_wait_for_tcp(conn);
3828 iscsit_unmap_iovec(cmd);
3829 goto err;
3830 }
3831 iscsit_unmap_iovec(cmd);
3832
3833 switch (state) {
3834 case ISTATE_SEND_LOGOUTRSP:
3835 if (!iscsit_logout_post_handler(cmd, conn))
3836 goto restart;
3837 /* fall through */
3838 case ISTATE_SEND_STATUS:
3839 case ISTATE_SEND_ASYNCMSG:
3840 case ISTATE_SEND_NOPIN:
3841 case ISTATE_SEND_STATUS_RECOVERY:
3842 case ISTATE_SEND_TEXTRSP:
3843 case ISTATE_SEND_TASKMGTRSP:
ba159914 3844 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3845 spin_lock_bh(&cmd->istate_lock);
3846 cmd->i_state = ISTATE_SENT_STATUS;
3847 spin_unlock_bh(&cmd->istate_lock);
3848 break;
2ec5a8c1
NB		 3849 default:
3850 pr_err("Unknown Opcode: 0x%02x ITT:"
3851 " 0x%08x, i_state: %d on CID: %hu\n",
3852 cmd->iscsi_opcode, cmd->init_task_tag,
3853 cmd->i_state, conn->cid);
3854 goto err;
6f3c0e69
AG		 3855 }
3856
2ec5a8c1
NB		 3857 if (atomic_read(&conn->check_immediate_queue))
3858 return 1;
3859
6f3c0e69
AG		 3860 return 0;
3861
3862err:
3863 return -1;
3864restart:
3865 return -EAGAIN;
3866}
3867
2ec5a8c1
NB		 3868static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3869{
3870 struct iscsit_transport *t = conn->conn_transport;
3871 struct iscsi_queue_req *qr;
3872 struct iscsi_cmd *cmd;
3873 u8 state;
3874 int ret;
3875
3876 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3877 cmd = qr->cmd;
3878 state = qr->state;
3879 kmem_cache_free(lio_qr_cache, qr);
3880
3881 ret = t->iscsit_response_queue(conn, cmd, state);
3882 if (ret == 1 || ret < 0)
3883 return ret;
3884 }
3885
3886 return 0;
3887}
3888
6f3c0e69
AG		 3889int iscsi_target_tx_thread(void *arg)
3890{
e48354ce 3891 int ret = 0;
e48354ce 3892 struct iscsi_conn *conn;
8359cf43 3893 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3894 /*
3895 * Allow ourselves to be interrupted by SIGINT so that a
3896 * connection recovery / failure event can be triggered externally.
3897 */
3898 allow_signal(SIGINT);
3899
3900restart:
3901 conn = iscsi_tx_thread_pre_handler(ts);
3902 if (!conn)
3903 goto out;
3904
6f3c0e69 3905 ret = 0;
e48354ce
NB		 3906
3907 while (!kthread_should_stop()) {
3908 /*
3909 * Ensure that both TX and RX per connection kthreads
3910 * are scheduled to run on the same CPU.
3911 */
3912 iscsit_thread_check_cpumask(conn, current, 1);
3913
d5627acb
RD		 3914 wait_event_interruptible(conn->queues_wq,
3915 !iscsit_conn_all_queues_empty(conn) ||
3916 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3917
3918 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3919 signal_pending(current))
3920 goto transport_err;
3921
fd3a9025 3922get_immediate:
2ec5a8c1 3923 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3924 if (ret < 0)
3925 goto transport_err;
e48354ce 3926
2ec5a8c1 3927 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3928 if (ret == 1)
3929 goto get_immediate;
3930 else if (ret == -EAGAIN)
6f3c0e69
AG		 3931 goto restart;
3932 else if (ret < 0)
3933 goto transport_err;
e48354ce
NB		 3934 }
3935
3936transport_err:
3937 iscsit_take_action_for_connection_exit(conn);
3938 goto restart;
3939out:
3940 return 0;
3941}
3942
3e1c81a9
NB		 3943static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3944{
3945 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3946 struct iscsi_cmd *cmd;
3947 int ret = 0;
3948
3949 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3950 case ISCSI_OP_SCSI_CMD:
3951 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3952 if (!cmd)
ba159914 3953 goto reject;
3e1c81a9
NB		 3954
3955 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3956 break;
3957 case ISCSI_OP_SCSI_DATA_OUT:
3958 ret = iscsit_handle_data_out(conn, buf);
3959 break;
3960 case ISCSI_OP_NOOP_OUT:
3961 cmd = NULL;
3962 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3963 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3964 if (!cmd)
ba159914 3965 goto reject;
3e1c81a9
NB		 3966 }
3967 ret = iscsit_handle_nop_out(conn, cmd, buf);
3968 break;
3969 case ISCSI_OP_SCSI_TMFUNC:
3970 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3971 if (!cmd)
ba159914 3972 goto reject;
3e1c81a9
NB		 3973
3974 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3975 break;
3976 case ISCSI_OP_TEXT:
64534aa7
NB		 3977 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3978 if (!cmd)
ba159914 3979 goto reject;
64534aa7
NB		 3980
3981 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 3982 break;
3983 case ISCSI_OP_LOGOUT:
3984 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3985 if (!cmd)
ba159914 3986 goto reject;
3e1c81a9
NB		 3987
3988 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3989 if (ret > 0)
3990 wait_for_completion_timeout(&conn->conn_logout_comp,
3991 SECONDS_FOR_LOGOUT_COMP * HZ);
3992 break;
3993 case ISCSI_OP_SNACK:
3994 ret = iscsit_handle_snack(conn, buf);
3995 break;
3996 default:
3997 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3998 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3999 pr_err("Cannot recover from unknown"
4000 " opcode while ERL=0, closing iSCSI connection.\n");
4001 return -1;
4002 }
4003 if (!conn->conn_ops->OFMarker) {
4004 pr_err("Unable to recover from unknown"
4005 " opcode while OFMarker=No, closing iSCSI"
4006 " connection.\n");
4007 return -1;
4008 }
4009 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4010 pr_err("Unable to recover from unknown"
4011 " opcode, closing iSCSI connection.\n");
4012 return -1;
4013 }
4014 break;
4015 }
4016
4017 return ret;
ba159914
NB		 4018reject:
4019 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 4020}
4021
e48354ce
NB		 4022int iscsi_target_rx_thread(void *arg)
4023{
4024 int ret;
4025 u8 buffer[ISCSI_HDR_LEN], opcode;
4026 u32 checksum = 0, digest = 0;
4027 struct iscsi_conn *conn = NULL;
8359cf43 4028 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 4029 struct kvec iov;
4030 /*
4031 * Allow ourselves to be interrupted by SIGINT so that a
4032 * connection recovery / failure event can be triggered externally.
4033 */
4034 allow_signal(SIGINT);
4035
4036restart:
4037 conn = iscsi_rx_thread_pre_handler(ts);
4038 if (!conn)
4039 goto out;
4040
3e1c81a9
NB		 4041 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4042 struct completion comp;
4043 int rc;
4044
4045 init_completion(&comp);
4046 rc = wait_for_completion_interruptible(&comp);
4047 if (rc < 0)
4048 goto transport_err;
4049
4050 goto out;
4051 }
4052
e48354ce
NB		 4053 while (!kthread_should_stop()) {
4054 /*
4055 * Ensure that both TX and RX per connection kthreads
4056 * are scheduled to run on the same CPU.
4057 */
4058 iscsit_thread_check_cpumask(conn, current, 0);
4059
4060 memset(buffer, 0, ISCSI_HDR_LEN);
4061 memset(&iov, 0, sizeof(struct kvec));
4062
4063 iov.iov_base = buffer;
4064 iov.iov_len = ISCSI_HDR_LEN;
4065
4066 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4067 if (ret != ISCSI_HDR_LEN) {
4068 iscsit_rx_thread_wait_for_tcp(conn);
4069 goto transport_err;
4070 }
4071
e48354ce
NB		 4072 if (conn->conn_ops->HeaderDigest) {
4073 iov.iov_base = &digest;
4074 iov.iov_len = ISCSI_CRC_LEN;
4075
4076 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4077 if (ret != ISCSI_CRC_LEN) {
4078 iscsit_rx_thread_wait_for_tcp(conn);
4079 goto transport_err;
4080 }
4081
4082 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4083 buffer, ISCSI_HDR_LEN,
4084 0, NULL, (u8 *)&checksum);
4085
4086 if (digest != checksum) {
4087 pr_err("HeaderDigest CRC32C failed,"
4088 " received 0x%08x, computed 0x%08x\n",
4089 digest, checksum);
4090 /*
4091 * Set the PDU to 0xff so it will intentionally
4092 * hit default in the switch below.
4093 */
4094 memset(buffer, 0xff, ISCSI_HDR_LEN);
4095 spin_lock_bh(&conn->sess->session_stats_lock);
4096 conn->sess->conn_digest_errors++;
4097 spin_unlock_bh(&conn->sess->session_stats_lock);
4098 } else {
4099 pr_debug("Got HeaderDigest CRC32C"
4100 " 0x%08x\n", checksum);
4101 }
4102 }
4103
4104 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4105 goto transport_err;
4106
4107 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4108
4109 if (conn->sess->sess_ops->SessionType &&
4110 ((!(opcode & ISCSI_OP_TEXT)) ||
4111 (!(opcode & ISCSI_OP_LOGOUT)))) {
4112 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4113 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4114 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4115 buffer);
e48354ce
NB		 4116 goto transport_err;
4117 }
4118
3e1c81a9
NB		 4119 ret = iscsi_target_rx_opcode(conn, buffer);
4120 if (ret < 0)
4121 goto transport_err;
e48354ce
NB		 4122 }
4123
4124transport_err:
4125 if (!signal_pending(current))
4126 atomic_set(&conn->transport_failed, 1);
4127 iscsit_take_action_for_connection_exit(conn);
4128 goto restart;
4129out:
4130 return 0;
4131}
4132
4133static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4134{
4135 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4136 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4137 /*
4138 * We expect this function to only ever be called from either RX or TX
4139 * thread context via iscsit_close_connection() once the other context
4140 * has been reset -> returned sleeping pre-handler state.
4141 */
4142 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4143 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4144
2fbb471e 4145 list_del(&cmd->i_conn_node);
e48354ce
NB		 4146 spin_unlock_bh(&conn->cmd_lock);
4147
4148 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4149
aafc9d15 4150 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4151
4152 spin_lock_bh(&conn->cmd_lock);
4153 }
4154 spin_unlock_bh(&conn->cmd_lock);
4155}
4156
4157static void iscsit_stop_timers_for_cmds(
4158 struct iscsi_conn *conn)
4159{
4160 struct iscsi_cmd *cmd;
4161
4162 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4163 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4164 if (cmd->data_direction == DMA_TO_DEVICE)
4165 iscsit_stop_dataout_timer(cmd);
4166 }
4167 spin_unlock_bh(&conn->cmd_lock);
4168}
4169
4170int iscsit_close_connection(
4171 struct iscsi_conn *conn)
4172{
4173 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4174 struct iscsi_session *sess = conn->sess;
4175
4176 pr_debug("Closing iSCSI connection CID %hu on SID:"
4177 " %u\n", conn->cid, sess->sid);
4178 /*
4179 * Always up conn_logout_comp just in case the RX Thread is sleeping
4180 * and the logout response never got sent because the connection
4181 * failed.
4182 */
4183 complete(&conn->conn_logout_comp);
4184
4185 iscsi_release_thread_set(conn);
4186
4187 iscsit_stop_timers_for_cmds(conn);
4188 iscsit_stop_nopin_response_timer(conn);
4189 iscsit_stop_nopin_timer(conn);
4190 iscsit_free_queue_reqs_for_conn(conn);
4191
4192 /*
4193 * During Connection recovery drop unacknowledged out of order
4194 * commands for this connection, and prepare the other commands
4195 * for realligence.
4196 *
4197 * During normal operation clear the out of order commands (but
4198 * do not free the struct iscsi_ooo_cmdsn's) and release all
4199 * struct iscsi_cmds.
4200 */
4201 if (atomic_read(&conn->connection_recovery)) {
4202 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4203 iscsit_prepare_cmds_for_realligance(conn);
4204 } else {
4205 iscsit_clear_ooo_cmdsns_for_conn(conn);
4206 iscsit_release_commands_from_conn(conn);
4207 }
4208
4209 /*
4210 * Handle decrementing session or connection usage count if
4211 * a logout response was not able to be sent because the
4212 * connection failed. Fall back to Session Recovery here.
4213 */
4214 if (atomic_read(&conn->conn_logout_remove)) {
4215 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4216 iscsit_dec_conn_usage_count(conn);
4217 iscsit_dec_session_usage_count(sess);
4218 }
4219 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4220 iscsit_dec_conn_usage_count(conn);
4221
4222 atomic_set(&conn->conn_logout_remove, 0);
4223 atomic_set(&sess->session_reinstatement, 0);
4224 atomic_set(&sess->session_fall_back_to_erl0, 1);
4225 }
4226
4227 spin_lock_bh(&sess->conn_lock);
4228 list_del(&conn->conn_list);
4229
4230 /*
4231 * Attempt to let the Initiator know this connection failed by
4232 * sending an Connection Dropped Async Message on another
4233 * active connection.
4234 */
4235 if (atomic_read(&conn->connection_recovery))
4236 iscsit_build_conn_drop_async_message(conn);
4237
4238 spin_unlock_bh(&sess->conn_lock);
4239
4240 /*
4241 * If connection reinstatement is being performed on this connection,
4242 * up the connection reinstatement semaphore that is being blocked on
4243 * in iscsit_cause_connection_reinstatement().
4244 */
4245 spin_lock_bh(&conn->state_lock);
4246 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4247 spin_unlock_bh(&conn->state_lock);
4248 complete(&conn->conn_wait_comp);
4249 wait_for_completion(&conn->conn_post_wait_comp);
4250 spin_lock_bh(&conn->state_lock);
4251 }
4252
4253 /*
4254 * If connection reinstatement is being performed on this connection
4255 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4256 * connection wait rcfr semaphore that is being blocked on
4257 * an iscsit_connection_reinstatement_rcfr().
4258 */
4259 if (atomic_read(&conn->connection_wait_rcfr)) {
4260 spin_unlock_bh(&conn->state_lock);
4261 complete(&conn->conn_wait_rcfr_comp);
4262 wait_for_completion(&conn->conn_post_wait_comp);
4263 spin_lock_bh(&conn->state_lock);
4264 }
4265 atomic_set(&conn->connection_reinstatement, 1);
4266 spin_unlock_bh(&conn->state_lock);
4267
4268 /*
4269 * If any other processes are accessing this connection pointer we
4270 * must wait until they have completed.
4271 */
4272 iscsit_check_conn_usage_count(conn);
4273
4274 if (conn->conn_rx_hash.tfm)
4275 crypto_free_hash(conn->conn_rx_hash.tfm);
4276 if (conn->conn_tx_hash.tfm)
4277 crypto_free_hash(conn->conn_tx_hash.tfm);
4278
4279 if (conn->conn_cpumask)
4280 free_cpumask_var(conn->conn_cpumask);
4281
4282 kfree(conn->conn_ops);
4283 conn->conn_ops = NULL;
4284
bf6932f4 4285 if (conn->sock)
e48354ce 4286 sock_release(conn->sock);
baa4d64b
NB		 4287
4288 if (conn->conn_transport->iscsit_free_conn)
4289 conn->conn_transport->iscsit_free_conn(conn);
4290
4291 iscsit_put_transport(conn->conn_transport);
4292
e48354ce
NB		 4293 conn->thread_set = NULL;
4294
4295 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4296 conn->conn_state = TARG_CONN_STATE_FREE;
4297 kfree(conn);
4298
4299 spin_lock_bh(&sess->conn_lock);
4300 atomic_dec(&sess->nconn);
4301 pr_debug("Decremented iSCSI connection count to %hu from node:"
4302 " %s\n", atomic_read(&sess->nconn),
4303 sess->sess_ops->InitiatorName);
4304 /*
4305 * Make sure that if one connection fails in an non ERL=2 iSCSI
4306 * Session that they all fail.
4307 */
4308 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4309 !atomic_read(&sess->session_logout))
4310 atomic_set(&sess->session_fall_back_to_erl0, 1);
4311
4312 /*
4313 * If this was not the last connection in the session, and we are
4314 * performing session reinstatement or falling back to ERL=0, call
4315 * iscsit_stop_session() without sleeping to shutdown the other
4316 * active connections.
4317 */
4318 if (atomic_read(&sess->nconn)) {
4319 if (!atomic_read(&sess->session_reinstatement) &&
4320 !atomic_read(&sess->session_fall_back_to_erl0)) {
4321 spin_unlock_bh(&sess->conn_lock);
4322 return 0;
4323 }
4324 if (!atomic_read(&sess->session_stop_active)) {
4325 atomic_set(&sess->session_stop_active, 1);
4326 spin_unlock_bh(&sess->conn_lock);
4327 iscsit_stop_session(sess, 0, 0);
4328 return 0;
4329 }
4330 spin_unlock_bh(&sess->conn_lock);
4331 return 0;
4332 }
4333
4334 /*
4335 * If this was the last connection in the session and one of the
4336 * following is occurring:
4337 *
4338 * Session Reinstatement is not being performed, and are falling back
4339 * to ERL=0 call iscsit_close_session().
4340 *
4341 * Session Logout was requested. iscsit_close_session() will be called
4342 * elsewhere.
4343 *
4344 * Session Continuation is not being performed, start the Time2Retain
4345 * handler and check if sleep_on_sess_wait_sem is active.
4346 */
4347 if (!atomic_read(&sess->session_reinstatement) &&
4348 atomic_read(&sess->session_fall_back_to_erl0)) {
4349 spin_unlock_bh(&sess->conn_lock);
99367f01 4350 target_put_session(sess->se_sess);
e48354ce
NB		 4351
4352 return 0;
4353 } else if (atomic_read(&sess->session_logout)) {
4354 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4355 sess->session_state = TARG_SESS_STATE_FREE;
4356 spin_unlock_bh(&sess->conn_lock);
4357
4358 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4359 complete(&sess->session_wait_comp);
4360
4361 return 0;
4362 } else {
4363 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4364 sess->session_state = TARG_SESS_STATE_FAILED;
4365
4366 if (!atomic_read(&sess->session_continuation)) {
4367 spin_unlock_bh(&sess->conn_lock);
4368 iscsit_start_time2retain_handler(sess);
4369 } else
4370 spin_unlock_bh(&sess->conn_lock);
4371
4372 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4373 complete(&sess->session_wait_comp);
4374
4375 return 0;
4376 }
4377 spin_unlock_bh(&sess->conn_lock);
4378
4379 return 0;
4380}
4381
4382int iscsit_close_session(struct iscsi_session *sess)
4383{
4384 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4385 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4386
4387 if (atomic_read(&sess->nconn)) {
4388 pr_err("%d connection(s) still exist for iSCSI session"
4389 " to %s\n", atomic_read(&sess->nconn),
4390 sess->sess_ops->InitiatorName);
4391 BUG();
4392 }
4393
4394 spin_lock_bh(&se_tpg->session_lock);
4395 atomic_set(&sess->session_logout, 1);
4396 atomic_set(&sess->session_reinstatement, 1);
4397 iscsit_stop_time2retain_timer(sess);
4398 spin_unlock_bh(&se_tpg->session_lock);
4399
4400 /*
4401 * transport_deregister_session_configfs() will clear the
4402 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4403 * can be setting it again with __transport_register_session() in
4404 * iscsi_post_login_handler() again after the iscsit_stop_session()
4405 * completes in iscsi_np context.
4406 */
4407 transport_deregister_session_configfs(sess->se_sess);
4408
4409 /*
4410 * If any other processes are accessing this session pointer we must
4411 * wait until they have completed. If we are in an interrupt (the
4412 * time2retain handler) and contain and active session usage count we
4413 * restart the timer and exit.
4414 */
4415 if (!in_interrupt()) {
4416 if (iscsit_check_session_usage_count(sess) == 1)
4417 iscsit_stop_session(sess, 1, 1);
4418 } else {
4419 if (iscsit_check_session_usage_count(sess) == 2) {
4420 atomic_set(&sess->session_logout, 0);
4421 iscsit_start_time2retain_handler(sess);
4422 return 0;
4423 }
4424 }
4425
4426 transport_deregister_session(sess->se_sess);
4427
4428 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4429 iscsit_free_connection_recovery_entires(sess);
4430
4431 iscsit_free_all_ooo_cmdsns(sess);
4432
4433 spin_lock_bh(&se_tpg->session_lock);
4434 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4435 sess->session_state = TARG_SESS_STATE_FREE;
4436 pr_debug("Released iSCSI session from node: %s\n",
4437 sess->sess_ops->InitiatorName);
4438 tpg->nsessions--;
4439 if (tpg->tpg_tiqn)
4440 tpg->tpg_tiqn->tiqn_nsessions--;
4441
4442 pr_debug("Decremented number of active iSCSI Sessions on"
4443 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4444
4445 spin_lock(&sess_idr_lock);
4446 idr_remove(&sess_idr, sess->session_index);
4447 spin_unlock(&sess_idr_lock);
4448
4449 kfree(sess->sess_ops);
4450 sess->sess_ops = NULL;
4451 spin_unlock_bh(&se_tpg->session_lock);
4452
4453 kfree(sess);
4454 return 0;
4455}
4456
4457static void iscsit_logout_post_handler_closesession(
4458 struct iscsi_conn *conn)
4459{
4460 struct iscsi_session *sess = conn->sess;
4461
4462 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4463 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4464
4465 atomic_set(&conn->conn_logout_remove, 0);
4466 complete(&conn->conn_logout_comp);
4467
4468 iscsit_dec_conn_usage_count(conn);
4469 iscsit_stop_session(sess, 1, 1);
4470 iscsit_dec_session_usage_count(sess);
99367f01 4471 target_put_session(sess->se_sess);
e48354ce
NB		 4472}
4473
4474static void iscsit_logout_post_handler_samecid(
4475 struct iscsi_conn *conn)
4476{
4477 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4478 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4479
4480 atomic_set(&conn->conn_logout_remove, 0);
4481 complete(&conn->conn_logout_comp);
4482
4483 iscsit_cause_connection_reinstatement(conn, 1);
4484 iscsit_dec_conn_usage_count(conn);
4485}
4486
4487static void iscsit_logout_post_handler_diffcid(
4488 struct iscsi_conn *conn,
4489 u16 cid)
4490{
4491 struct iscsi_conn *l_conn;
4492 struct iscsi_session *sess = conn->sess;
4493
4494 if (!sess)
4495 return;
4496
4497 spin_lock_bh(&sess->conn_lock);
4498 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4499 if (l_conn->cid == cid) {
4500 iscsit_inc_conn_usage_count(l_conn);
4501 break;
4502 }
4503 }
4504 spin_unlock_bh(&sess->conn_lock);
4505
4506 if (!l_conn)
4507 return;
4508
4509 if (l_conn->sock)
4510 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4511
4512 spin_lock_bh(&l_conn->state_lock);
4513 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4514 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4515 spin_unlock_bh(&l_conn->state_lock);
4516
4517 iscsit_cause_connection_reinstatement(l_conn, 1);
4518 iscsit_dec_conn_usage_count(l_conn);
4519}
4520
4521/*
4522 * Return of 0 causes the TX thread to restart.
4523 */
2ec5a8c1 4524int iscsit_logout_post_handler(
e48354ce
NB		 4525 struct iscsi_cmd *cmd,
4526 struct iscsi_conn *conn)
4527{
4528 int ret = 0;
4529
4530 switch (cmd->logout_reason) {
4531 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4532 switch (cmd->logout_response) {
4533 case ISCSI_LOGOUT_SUCCESS:
4534 case ISCSI_LOGOUT_CLEANUP_FAILED:
4535 default:
4536 iscsit_logout_post_handler_closesession(conn);
4537 break;
4538 }
4539 ret = 0;
4540 break;
4541 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4542 if (conn->cid == cmd->logout_cid) {
4543 switch (cmd->logout_response) {
4544 case ISCSI_LOGOUT_SUCCESS:
4545 case ISCSI_LOGOUT_CLEANUP_FAILED:
4546 default:
4547 iscsit_logout_post_handler_samecid(conn);
4548 break;
4549 }
4550 ret = 0;
4551 } else {
4552 switch (cmd->logout_response) {
4553 case ISCSI_LOGOUT_SUCCESS:
4554 iscsit_logout_post_handler_diffcid(conn,
4555 cmd->logout_cid);
4556 break;
4557 case ISCSI_LOGOUT_CID_NOT_FOUND:
4558 case ISCSI_LOGOUT_CLEANUP_FAILED:
4559 default:
4560 break;
4561 }
4562 ret = 1;
4563 }
4564 break;
4565 case ISCSI_LOGOUT_REASON_RECOVERY:
4566 switch (cmd->logout_response) {
4567 case ISCSI_LOGOUT_SUCCESS:
4568 case ISCSI_LOGOUT_CID_NOT_FOUND:
4569 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4570 case ISCSI_LOGOUT_CLEANUP_FAILED:
4571 default:
4572 break;
4573 }
4574 ret = 1;
4575 break;
4576 default:
4577 break;
4578
4579 }
4580 return ret;
4581}
2ec5a8c1 4582EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4583
4584void iscsit_fail_session(struct iscsi_session *sess)
4585{
4586 struct iscsi_conn *conn;
4587
4588 spin_lock_bh(&sess->conn_lock);
4589 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4590 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4591 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4592 }
4593 spin_unlock_bh(&sess->conn_lock);
4594
4595 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4596 sess->session_state = TARG_SESS_STATE_FAILED;
4597}
4598
4599int iscsit_free_session(struct iscsi_session *sess)
4600{
4601 u16 conn_count = atomic_read(&sess->nconn);
4602 struct iscsi_conn *conn, *conn_tmp = NULL;
4603 int is_last;
4604
4605 spin_lock_bh(&sess->conn_lock);
4606 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4607
4608 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4609 conn_list) {
4610 if (conn_count == 0)
4611 break;
4612
4613 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4614 is_last = 1;
4615 } else {
4616 iscsit_inc_conn_usage_count(conn_tmp);
4617 is_last = 0;
4618 }
4619 iscsit_inc_conn_usage_count(conn);
4620
4621 spin_unlock_bh(&sess->conn_lock);
4622 iscsit_cause_connection_reinstatement(conn, 1);
4623 spin_lock_bh(&sess->conn_lock);
4624
4625 iscsit_dec_conn_usage_count(conn);
4626 if (is_last == 0)
4627 iscsit_dec_conn_usage_count(conn_tmp);
4628
4629 conn_count--;
4630 }
4631
4632 if (atomic_read(&sess->nconn)) {
4633 spin_unlock_bh(&sess->conn_lock);
4634 wait_for_completion(&sess->session_wait_comp);
4635 } else
4636 spin_unlock_bh(&sess->conn_lock);
4637
99367f01 4638 target_put_session(sess->se_sess);
e48354ce
NB		 4639 return 0;
4640}
4641
4642void iscsit_stop_session(
4643 struct iscsi_session *sess,
4644 int session_sleep,
4645 int connection_sleep)
4646{
4647 u16 conn_count = atomic_read(&sess->nconn);
4648 struct iscsi_conn *conn, *conn_tmp = NULL;
4649 int is_last;
4650
4651 spin_lock_bh(&sess->conn_lock);
4652 if (session_sleep)
4653 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4654
4655 if (connection_sleep) {
4656 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4657 conn_list) {
4658 if (conn_count == 0)
4659 break;
4660
4661 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4662 is_last = 1;
4663 } else {
4664 iscsit_inc_conn_usage_count(conn_tmp);
4665 is_last = 0;
4666 }
4667 iscsit_inc_conn_usage_count(conn);
4668
4669 spin_unlock_bh(&sess->conn_lock);
4670 iscsit_cause_connection_reinstatement(conn, 1);
4671 spin_lock_bh(&sess->conn_lock);
4672
4673 iscsit_dec_conn_usage_count(conn);
4674 if (is_last == 0)
4675 iscsit_dec_conn_usage_count(conn_tmp);
4676 conn_count--;
4677 }
4678 } else {
4679 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4680 iscsit_cause_connection_reinstatement(conn, 0);
4681 }
4682
4683 if (session_sleep && atomic_read(&sess->nconn)) {
4684 spin_unlock_bh(&sess->conn_lock);
4685 wait_for_completion(&sess->session_wait_comp);
4686 } else
4687 spin_unlock_bh(&sess->conn_lock);
4688}
4689
4690int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4691{
4692 struct iscsi_session *sess;
4693 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4694 struct se_session *se_sess, *se_sess_tmp;
4695 int session_count = 0;
4696
4697 spin_lock_bh(&se_tpg->session_lock);
4698 if (tpg->nsessions && !force) {
4699 spin_unlock_bh(&se_tpg->session_lock);
4700 return -1;
4701 }
4702
4703 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4704 sess_list) {
4705 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4706
4707 spin_lock(&sess->conn_lock);
4708 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4709 atomic_read(&sess->session_logout) ||
4710 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4711 spin_unlock(&sess->conn_lock);
4712 continue;
4713 }
4714 atomic_set(&sess->session_reinstatement, 1);
4715 spin_unlock(&sess->conn_lock);
4716 spin_unlock_bh(&se_tpg->session_lock);
4717
4718 iscsit_free_session(sess);
4719 spin_lock_bh(&se_tpg->session_lock);
4720
4721 session_count++;
4722 }
4723 spin_unlock_bh(&se_tpg->session_lock);
4724
4725 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4726 " Group: %hu\n", session_count, tpg->tpgt);
4727 return 0;
4728}
4729
4730MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4731MODULE_VERSION("4.1.x");
4732MODULE_AUTHOR("nab@Linux-iSCSI.org");
4733MODULE_LICENSE("GPL");
4734
4735module_init(iscsi_target_init_module);
4736module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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