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target: Fix inverted logic in SE_DEV_ALUA_SUPPORT_STATE_STORE
[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19#include <linux/string.h>
20#include <linux/kthread.h>
21#include <linux/crypto.h>
22#include <linux/completion.h>
827509e3 23#include <linux/module.h>
40401530 24#include <linux/idr.h>
e48354ce
NB		 25#include <asm/unaligned.h>
26#include <scsi/scsi_device.h>
27#include <scsi/iscsi_proto.h>
d28b1169 28#include <scsi/scsi_tcq.h>
e48354ce 29#include <target/target_core_base.h>
c4795fb2 30#include <target/target_core_fabric.h>
d28b1169 31#include <target/target_core_configfs.h>
e48354ce
NB		 32
33#include "iscsi_target_core.h"
34#include "iscsi_target_parameters.h"
35#include "iscsi_target_seq_pdu_list.h"
36#include "iscsi_target_tq.h"
37#include "iscsi_target_configfs.h"
38#include "iscsi_target_datain_values.h"
39#include "iscsi_target_erl0.h"
40#include "iscsi_target_erl1.h"
41#include "iscsi_target_erl2.h"
42#include "iscsi_target_login.h"
43#include "iscsi_target_tmr.h"
44#include "iscsi_target_tpg.h"
45#include "iscsi_target_util.h"
46#include "iscsi_target.h"
47#include "iscsi_target_device.h"
48#include "iscsi_target_stat.h"
49
baa4d64b
NB		 50#include <target/iscsi/iscsi_transport.h>
51
e48354ce
NB		 52static LIST_HEAD(g_tiqn_list);
53static LIST_HEAD(g_np_list);
54static DEFINE_SPINLOCK(tiqn_lock);
ee291e63 55static DEFINE_MUTEX(np_lock);
e48354ce
NB		 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
0bcc297e 303 if (ip_match && (np->np_port == port) &&
05b96892
NB		 304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308}
309
ee291e63
AG		 310/*
311 * Called with mutex np_lock held
312 */
05b96892
NB		 313static struct iscsi_np *iscsit_get_np(
314 struct __kernel_sockaddr_storage *sockaddr,
315 int network_transport)
316{
317 struct iscsi_np *np;
318 bool match;
319
e48354ce 320 list_for_each_entry(np, &g_np_list, np_list) {
ee291e63 321 spin_lock_bh(&np->np_thread_lock);
e48354ce 322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
ee291e63 323 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 324 continue;
325 }
326
05b96892 327 match = iscsit_check_np_match(sockaddr, np, network_transport);
0bcc297e 328 if (match) {
e48354ce
NB		 329 /*
330 * Increment the np_exports reference count now to
331 * prevent iscsit_del_np() below from being called
332 * while iscsi_tpg_add_network_portal() is called.
333 */
334 np->np_exports++;
ee291e63 335 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 336 return np;
337 }
ee291e63 338 spin_unlock_bh(&np->np_thread_lock);
e48354ce 339 }
e48354ce
NB		 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;
ee291e63
AG		 353
354 mutex_lock(&np_lock);
355
e48354ce
NB		 356 /*
357 * Locate the existing struct iscsi_np if already active..
358 */
359 np = iscsit_get_np(sockaddr, network_transport);
ee291e63
AG		 360 if (np) {
361 mutex_unlock(&np_lock);
e48354ce 362 return np;
ee291e63 363 }
e48354ce
NB		 364
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
366 if (!np) {
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
ee291e63 368 mutex_unlock(&np_lock);
e48354ce
NB		 369 return ERR_PTR(-ENOMEM);
370 }
371
372 np->np_flags |= NPF_IP_NETWORK;
373 if (sockaddr->ss_family == AF_INET6) {
374 sock_in6 = (struct sockaddr_in6 *)sockaddr;
375 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
376 np->np_port = ntohs(sock_in6->sin6_port);
377 } else {
378 sock_in = (struct sockaddr_in *)sockaddr;
379 sprintf(np->np_ip, "%s", ip_str);
380 np->np_port = ntohs(sock_in->sin_port);
381 }
382
383 np->np_network_transport = network_transport;
384 spin_lock_init(&np->np_thread_lock);
385 init_completion(&np->np_restart_comp);
386 INIT_LIST_HEAD(&np->np_list);
387
388 ret = iscsi_target_setup_login_socket(np, sockaddr);
389 if (ret != 0) {
390 kfree(np);
ee291e63 391 mutex_unlock(&np_lock);
e48354ce
NB		 392 return ERR_PTR(ret);
393 }
394
395 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
396 if (IS_ERR(np->np_thread)) {
397 pr_err("Unable to create kthread: iscsi_np\n");
398 ret = PTR_ERR(np->np_thread);
399 kfree(np);
ee291e63 400 mutex_unlock(&np_lock);
e48354ce
NB		 401 return ERR_PTR(ret);
402 }
403 /*
404 * Increment the np_exports reference count now to prevent
405 * iscsit_del_np() below from being run while a new call to
406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
407 * active. We don't need to hold np->np_thread_lock at this
408 * point because iscsi_np has not been added to g_np_list yet.
409 */
410 np->np_exports = 1;
ee291e63 411 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 412
e48354ce 413 list_add_tail(&np->np_list, &g_np_list);
ee291e63 414 mutex_unlock(&np_lock);
e48354ce
NB		 415
416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 417 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 418
419 return np;
420}
421
422int iscsit_reset_np_thread(
423 struct iscsi_np *np,
424 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 425 struct iscsi_portal_group *tpg,
426 bool shutdown)
e48354ce
NB		 427{
428 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 429 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
430 spin_unlock_bh(&np->np_thread_lock);
431 return 0;
432 }
433 np->np_thread_state = ISCSI_NP_THREAD_RESET;
434
435 if (np->np_thread) {
436 spin_unlock_bh(&np->np_thread_lock);
437 send_sig(SIGINT, np->np_thread, 1);
438 wait_for_completion(&np->np_restart_comp);
439 spin_lock_bh(&np->np_thread_lock);
440 }
441 spin_unlock_bh(&np->np_thread_lock);
442
a91eb7d9
NB		 443 if (tpg_np && shutdown) {
444 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
445
446 wait_for_completion(&tpg_np->tpg_np_comp);
447 }
448
e48354ce
NB		 449 return 0;
450}
451
baa4d64b 452static void iscsit_free_np(struct iscsi_np *np)
e48354ce 453{
bf6932f4
AV		 454 if (np->np_socket)
455 sock_release(np->np_socket);
e48354ce
NB		 456}
457
458int iscsit_del_np(struct iscsi_np *np)
459{
460 spin_lock_bh(&np->np_thread_lock);
461 np->np_exports--;
462 if (np->np_exports) {
2363d196 463 np->enabled = true;
e48354ce
NB		 464 spin_unlock_bh(&np->np_thread_lock);
465 return 0;
466 }
467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
468 spin_unlock_bh(&np->np_thread_lock);
469
470 if (np->np_thread) {
471 /*
472 * We need to send the signal to wakeup Linux/Net
473 * which may be sleeping in sock_accept()..
474 */
475 send_sig(SIGINT, np->np_thread, 1);
476 kthread_stop(np->np_thread);
db6077fd 477 np->np_thread = NULL;
e48354ce 478 }
baa4d64b
NB		 479
480 np->np_transport->iscsit_free_np(np);
e48354ce 481
ee291e63 482 mutex_lock(&np_lock);
e48354ce 483 list_del(&np->np_list);
ee291e63 484 mutex_unlock(&np_lock);
e48354ce
NB		 485
486 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 487 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 488
baa4d64b 489 iscsit_put_transport(np->np_transport);
e48354ce
NB		 490 kfree(np);
491 return 0;
492}
493
2ec5a8c1
NB		 494static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
496
497static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
498{
499 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
500 return 0;
501}
502
131e6abc
NB		 503static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
504{
505 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
506
507 spin_lock_bh(&conn->cmd_lock);
508 if (!list_empty(&cmd->i_conn_node))
509 list_del_init(&cmd->i_conn_node);
510 spin_unlock_bh(&conn->cmd_lock);
511
512 __iscsit_free_cmd(cmd, scsi_cmd, true);
513}
514
e70beee7
NB		 515static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
516{
517 return TARGET_PROT_NORMAL;
518}
519
baa4d64b
NB		 520static struct iscsit_transport iscsi_target_transport = {
521 .name = "iSCSI/TCP",
522 .transport_type = ISCSI_TCP,
523 .owner = NULL,
524 .iscsit_setup_np = iscsit_setup_np,
525 .iscsit_accept_np = iscsit_accept_np,
526 .iscsit_free_np = iscsit_free_np,
527 .iscsit_get_login_rx = iscsit_get_login_rx,
528 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 529 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 530 .iscsit_immediate_queue = iscsit_immediate_queue,
531 .iscsit_response_queue = iscsit_response_queue,
532 .iscsit_queue_data_in = iscsit_queue_rsp,
533 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 534 .iscsit_aborted_task = iscsit_aborted_task,
e70beee7 535 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
baa4d64b
NB		 536};
537
e48354ce
NB		 538static int __init iscsi_target_init_module(void)
539{
540 int ret = 0;
541
542 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
543
544 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
545 if (!iscsit_global) {
546 pr_err("Unable to allocate memory for iscsit_global\n");
547 return -1;
548 }
549 mutex_init(&auth_id_lock);
550 spin_lock_init(&sess_idr_lock);
551 idr_init(&tiqn_idr);
552 idr_init(&sess_idr);
553
554 ret = iscsi_target_register_configfs();
555 if (ret < 0)
556 goto out;
557
558 ret = iscsi_thread_set_init();
559 if (ret < 0)
560 goto configfs_out;
561
562 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
563 TARGET_THREAD_SET_COUNT) {
564 pr_err("iscsi_allocate_thread_sets() returned"
565 " unexpected value!\n");
566 goto ts_out1;
567 }
568
e48354ce
NB		 569 lio_qr_cache = kmem_cache_create("lio_qr_cache",
570 sizeof(struct iscsi_queue_req),
571 __alignof__(struct iscsi_queue_req), 0, NULL);
572 if (!lio_qr_cache) {
573 pr_err("nable to kmem_cache_create() for"
574 " lio_qr_cache\n");
d703ce2f 575 goto ts_out2;
e48354ce
NB		 576 }
577
578 lio_dr_cache = kmem_cache_create("lio_dr_cache",
579 sizeof(struct iscsi_datain_req),
580 __alignof__(struct iscsi_datain_req), 0, NULL);
581 if (!lio_dr_cache) {
582 pr_err("Unable to kmem_cache_create() for"
583 " lio_dr_cache\n");
584 goto qr_out;
585 }
586
587 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
588 sizeof(struct iscsi_ooo_cmdsn),
589 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
590 if (!lio_ooo_cache) {
591 pr_err("Unable to kmem_cache_create() for"
592 " lio_ooo_cache\n");
593 goto dr_out;
594 }
595
596 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
597 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
598 0, NULL);
599 if (!lio_r2t_cache) {
600 pr_err("Unable to kmem_cache_create() for"
601 " lio_r2t_cache\n");
602 goto ooo_out;
603 }
604
baa4d64b
NB		 605 iscsit_register_transport(&iscsi_target_transport);
606
e48354ce
NB		 607 if (iscsit_load_discovery_tpg() < 0)
608 goto r2t_out;
609
610 return ret;
611r2t_out:
612 kmem_cache_destroy(lio_r2t_cache);
613ooo_out:
614 kmem_cache_destroy(lio_ooo_cache);
615dr_out:
616 kmem_cache_destroy(lio_dr_cache);
617qr_out:
618 kmem_cache_destroy(lio_qr_cache);
e48354ce
NB		 619ts_out2:
620 iscsi_deallocate_thread_sets();
621ts_out1:
622 iscsi_thread_set_free();
623configfs_out:
624 iscsi_target_deregister_configfs();
625out:
626 kfree(iscsit_global);
627 return -ENOMEM;
628}
629
630static void __exit iscsi_target_cleanup_module(void)
631{
632 iscsi_deallocate_thread_sets();
633 iscsi_thread_set_free();
634 iscsit_release_discovery_tpg();
baa4d64b 635 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 636 kmem_cache_destroy(lio_qr_cache);
637 kmem_cache_destroy(lio_dr_cache);
638 kmem_cache_destroy(lio_ooo_cache);
639 kmem_cache_destroy(lio_r2t_cache);
640
641 iscsi_target_deregister_configfs();
642
643 kfree(iscsit_global);
644}
645
8b1e1244 646static int iscsit_add_reject(
ba159914 647 struct iscsi_conn *conn,
e48354ce 648 u8 reason,
ba159914 649 unsigned char *buf)
e48354ce
NB		 650{
651 struct iscsi_cmd *cmd;
e48354ce 652
676687c6 653 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 654 if (!cmd)
655 return -1;
656
657 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 658 cmd->reject_reason = reason;
e48354ce 659
1c3d5794 660 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 661 if (!cmd->buf_ptr) {
662 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 663 iscsit_free_cmd(cmd, false);
e48354ce
NB		 664 return -1;
665 }
e48354ce
NB		 666
667 spin_lock_bh(&conn->cmd_lock);
2fbb471e 668 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 669 spin_unlock_bh(&conn->cmd_lock);
670
671 cmd->i_state = ISTATE_SEND_REJECT;
672 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
673
ba159914 674 return -1;
e48354ce
NB		 675}
676
ba159914
NB		 677static int iscsit_add_reject_from_cmd(
678 struct iscsi_cmd *cmd,
e48354ce 679 u8 reason,
ba159914
NB		 680 bool add_to_conn,
681 unsigned char *buf)
e48354ce
NB		 682{
683 struct iscsi_conn *conn;
e48354ce
NB		 684
685 if (!cmd->conn) {
686 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
687 cmd->init_task_tag);
688 return -1;
689 }
690 conn = cmd->conn;
691
692 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 693 cmd->reject_reason = reason;
e48354ce 694
1c3d5794 695 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 696 if (!cmd->buf_ptr) {
697 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 698 iscsit_free_cmd(cmd, false);
e48354ce
NB		 699 return -1;
700 }
e48354ce
NB		 701
702 if (add_to_conn) {
703 spin_lock_bh(&conn->cmd_lock);
2fbb471e 704 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 705 spin_unlock_bh(&conn->cmd_lock);
706 }
707
708 cmd->i_state = ISTATE_SEND_REJECT;
709 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 710 /*
711 * Perform the kref_put now if se_cmd has already been setup by
712 * scsit_setup_scsi_cmd()
713 */
714 if (cmd->se_cmd.se_tfo != NULL) {
715 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
716 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
717 }
ba159914
NB		 718 return -1;
719}
e48354ce 720
ba159914
NB		 721static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
722 unsigned char *buf)
723{
724 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
725}
726
727int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
728{
729 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 730}
731
732/*
733 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 734 * kernel sockets to copy data in/out.
e48354ce
NB		 735 */
736static int iscsit_map_iovec(
737 struct iscsi_cmd *cmd,
738 struct kvec *iov,
739 u32 data_offset,
740 u32 data_length)
741{
742 u32 i = 0;
743 struct scatterlist *sg;
744 unsigned int page_off;
745
746 /*
bfb79eac 747 * We know each entry in t_data_sg contains a page.
e48354ce 748 */
bfb79eac 749 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 750 page_off = (data_offset % PAGE_SIZE);
751
752 cmd->first_data_sg = sg;
753 cmd->first_data_sg_off = page_off;
754
755 while (data_length) {
756 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
757
758 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
759 iov[i].iov_len = cur_len;
760
761 data_length -= cur_len;
762 page_off = 0;
763 sg = sg_next(sg);
764 i++;
765 }
766
767 cmd->kmapped_nents = i;
768
769 return i;
770}
771
772static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
773{
774 u32 i;
775 struct scatterlist *sg;
776
777 sg = cmd->first_data_sg;
778
779 for (i = 0; i < cmd->kmapped_nents; i++)
780 kunmap(sg_page(&sg[i]));
781}
782
783static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
784{
f56cbbb4
NB		 785 LIST_HEAD(ack_list);
786 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 787
788 conn->exp_statsn = exp_statsn;
789
3e1c81a9
NB		 790 if (conn->sess->sess_ops->RDMAExtensions)
791 return;
792
e48354ce 793 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 794 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 795 spin_lock(&cmd->istate_lock);
796 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 797 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 798 cmd->i_state = ISTATE_REMOVE;
799 spin_unlock(&cmd->istate_lock);
f56cbbb4 800 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 801 continue;
802 }
803 spin_unlock(&cmd->istate_lock);
804 }
805 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 806
807 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 808 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 809 iscsit_free_cmd(cmd, false);
810 }
e48354ce
NB		 811}
812
813static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
814{
f80e8ed3 815 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 816
c0427f15 817 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 818
819 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
820 if (!cmd->iov_data) {
821 pr_err("Unable to allocate cmd->iov_data\n");
822 return -ENOMEM;
823 }
824
825 cmd->orig_iov_data_count = iov_count;
826 return 0;
827}
828
3e1c81a9
NB		 829int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
830 unsigned char *buf)
e48354ce 831{
3e1c81a9 832 int data_direction, payload_length;
e48354ce 833 struct iscsi_scsi_req *hdr;
d28b1169
AG		 834 int iscsi_task_attr;
835 int sam_task_attr;
e48354ce 836
04f3b31b 837 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 838
839 hdr = (struct iscsi_scsi_req *) buf;
840 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 841
842 /* FIXME; Add checks for AdditionalHeaderSegment */
843
844 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
845 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
846 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
847 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 848 return iscsit_add_reject_cmd(cmd,
849 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 850 }
851
852 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
853 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
854 /*
4454b66c
NB		 855 * From RFC-3720 Section 10.3.1:
856 *
857 * "Either or both of R and W MAY be 1 when either the
858 * Expected Data Transfer Length and/or Bidirectional Read
859 * Expected Data Transfer Length are 0"
860 *
861 * For this case, go ahead and clear the unnecssary bits
862 * to avoid any confusion with ->data_direction.
e48354ce 863 */
4454b66c
NB		 864 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
865 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 866
4454b66c 867 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 868 " set when Expected Data Transfer Length is 0 for"
4454b66c 869 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 870 }
e48354ce
NB		 871
872 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
873 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
874 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
875 " MUST be set if Expected Data Transfer Length is not 0."
876 " Bad iSCSI Initiator\n");
ba159914
NB		 877 return iscsit_add_reject_cmd(cmd,
878 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 879 }
880
881 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
882 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
883 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 884 return iscsit_add_reject_cmd(cmd,
885 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 886 }
887
888 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
889 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
890 " Scsi Command PDU.\n");
ba159914
NB		 891 return iscsit_add_reject_cmd(cmd,
892 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 893 }
894
895 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
896 pr_err("ImmediateData=No but DataSegmentLength=%u,"
897 " protocol error.\n", payload_length);
ba159914
NB		 898 return iscsit_add_reject_cmd(cmd,
899 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 900 }
901
ba159914 902 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 903 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
904 pr_err("Expected Data Transfer Length and Length of"
905 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
906 " bit is not set protocol error\n");
ba159914
NB		 907 return iscsit_add_reject_cmd(cmd,
908 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 909 }
910
50e5c87d 911 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 912 pr_err("DataSegmentLength: %u is greater than"
913 " EDTL: %u, protocol error.\n", payload_length,
914 hdr->data_length);
ba159914
NB		 915 return iscsit_add_reject_cmd(cmd,
916 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 917 }
918
21f5aa7e 919 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 920 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 921 " MaxXmitDataSegmentLength: %u, protocol error.\n",
922 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 923 return iscsit_add_reject_cmd(cmd,
924 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 925 }
926
927 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
928 pr_err("DataSegmentLength: %u is greater than"
929 " FirstBurstLength: %u, protocol error.\n",
930 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 931 return iscsit_add_reject_cmd(cmd,
932 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 933 }
934
935 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
936 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
937 DMA_NONE;
938
d28b1169 939 cmd->data_direction = data_direction;
d28b1169
AG		 940 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
941 /*
942 * Figure out the SAM Task Attribute for the incoming SCSI CDB
943 */
944 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
945 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
946 sam_task_attr = MSG_SIMPLE_TAG;
947 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
948 sam_task_attr = MSG_ORDERED_TAG;
949 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
950 sam_task_attr = MSG_HEAD_TAG;
951 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
952 sam_task_attr = MSG_ACA_TAG;
953 else {
954 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
955 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
956 sam_task_attr = MSG_SIMPLE_TAG;
957 }
958
e48354ce
NB		 959 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
960 cmd->i_state = ISTATE_NEW_CMD;
961 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
962 cmd->immediate_data = (payload_length) ? 1 : 0;
963 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
964 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
965 if (cmd->unsolicited_data)
966 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
967
968 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
969 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
970 spin_lock_bh(&conn->sess->ttt_lock);
971 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
972 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
973 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
974 spin_unlock_bh(&conn->sess->ttt_lock);
975 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
976 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 977 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
978 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 979 cmd->first_burst_len = payload_length;
980
3e1c81a9
NB		 981 if (!conn->sess->sess_ops->RDMAExtensions &&
982 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 983 struct iscsi_datain_req *dr;
984
985 dr = iscsit_allocate_datain_req();
986 if (!dr)
ba159914
NB		 987 return iscsit_add_reject_cmd(cmd,
988 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 989
990 iscsit_attach_datain_req(cmd, dr);
991 }
992
065ca1e4
AG		 993 /*
994 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
995 */
996 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 997 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
998 cmd->data_direction, sam_task_attr,
999 cmd->sense_buffer + 2);
065ca1e4
AG		 1000
1001 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1002 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 1003 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1004 conn->cid);
1005
1006 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 1007
de103c93
CH		 1008 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1009 scsilun_to_int(&hdr->lun));
1010 if (cmd->sense_reason)
1011 goto attach_cmd;
1012
1013 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1014 if (cmd->sense_reason) {
1015 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1016 return iscsit_add_reject_cmd(cmd,
1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1018 }
de103c93 1019
e48354ce
NB		 1020 goto attach_cmd;
1021 }
a12f41f8 1022
de103c93 1023 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1024 return iscsit_add_reject_cmd(cmd,
1025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1026 }
1027
1028attach_cmd:
1029 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1031 spin_unlock_bh(&conn->cmd_lock);
1032 /*
1033 * Check if we need to delay processing because of ALUA
1034 * Active/NonOptimized primary access state..
1035 */
1036 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1037
3e1c81a9
NB		 1038 return 0;
1039}
1040EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1041
3e1c81a9
NB		 1042void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1043{
1044 iscsit_set_dataout_sequence_values(cmd);
1045
1046 spin_lock_bh(&cmd->dataout_timeout_lock);
1047 iscsit_start_dataout_timer(cmd, cmd->conn);
1048 spin_unlock_bh(&cmd->dataout_timeout_lock);
1049}
1050EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1051
1052int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1053 struct iscsi_scsi_req *hdr)
1054{
1055 int cmdsn_ret = 0;
e48354ce
NB		 1056 /*
1057 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1058 * the Immediate Bit is not set, and no Immediate
1059 * Data is attached.
1060 *
1061 * A PDU/CmdSN carrying Immediate Data can only
1062 * be processed after the DataCRC has passed.
1063 * If the DataCRC fails, the CmdSN MUST NOT
1064 * be acknowledged. (See below)
1065 */
1066 if (!cmd->immediate_data) {
561bf158
NB		 1067 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1068 (unsigned char *)hdr, hdr->cmdsn);
1069 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1070 return -1;
1071 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1072 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1073 return 0;
3e1c81a9 1074 }
e48354ce
NB		 1075 }
1076
50e5c87d 1077 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1078
1079 /*
1080 * If no Immediate Data is attached, it's OK to return now.
1081 */
1082 if (!cmd->immediate_data) {
3e1c81a9
NB		 1083 if (!cmd->sense_reason && cmd->unsolicited_data)
1084 iscsit_set_unsoliticed_dataout(cmd);
1085 if (!cmd->sense_reason)
1086 return 0;
e48354ce 1087
3e1c81a9 1088 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1089 return 0;
1090 }
1091
1092 /*
3e1c81a9
NB		 1093 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1094 * execution. These exceptions are processed in CmdSN order using
1095 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1096 */
de103c93 1097 if (cmd->sense_reason) {
561bf158
NB		 1098 if (cmd->reject_reason)
1099 return 0;
1100
3e1c81a9 1101 return 1;
e48354ce
NB		 1102 }
1103 /*
1104 * Call directly into transport_generic_new_cmd() to perform
1105 * the backend memory allocation.
1106 */
de103c93 1107 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1108 if (cmd->sense_reason)
3e1c81a9 1109 return 1;
e48354ce 1110
3e1c81a9
NB		 1111 return 0;
1112}
1113EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1114
1115static int
1116iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1117 bool dump_payload)
1118{
561bf158 1119 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1120 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121 /*
1122 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1123 */
0bcc297e 1124 if (dump_payload)
3e1c81a9
NB		 1125 goto after_immediate_data;
1126
1127 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1128 cmd->first_burst_len);
e48354ce
NB		 1129after_immediate_data:
1130 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1131 /*
1132 * A PDU/CmdSN carrying Immediate Data passed
1133 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1134 * Immediate Bit is not set.
1135 */
561bf158
NB		 1136 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1137 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1138 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1139 return -1;
3e1c81a9 1140
9d86a2be 1141 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1142 int rc;
1143
1144 rc = iscsit_dump_data_payload(cmd->conn,
1145 cmd->first_burst_len, 1);
1146 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1147 return rc;
3e1c81a9
NB		 1148 } else if (cmd->unsolicited_data)
1149 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1150
e48354ce
NB		 1151 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1152 /*
1153 * Immediate Data failed DataCRC and ERL>=1,
1154 * silently drop this PDU and let the initiator
1155 * plug the CmdSN gap.
1156 *
1157 * FIXME: Send Unsolicited NOPIN with reserved
1158 * TTT here to help the initiator figure out
1159 * the missing CmdSN, although they should be
1160 * intelligent enough to determine the missing
1161 * CmdSN and issue a retry to plug the sequence.
1162 */
1163 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1164 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1165 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1166 return -1;
1167
1168 return 0;
1169}
1170
3e1c81a9
NB		 1171static int
1172iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1173 unsigned char *buf)
1174{
1175 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1176 int rc, immed_data;
1177 bool dump_payload = false;
1178
1179 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1180 if (rc < 0)
561bf158 1181 return 0;
3e1c81a9
NB		 1182 /*
1183 * Allocation iovecs needed for struct socket operations for
1184 * traditional iSCSI block I/O.
1185 */
1186 if (iscsit_allocate_iovecs(cmd) < 0) {
ba159914
NB		 1187 return iscsit_add_reject_cmd(cmd,
1188 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1189 }
1190 immed_data = cmd->immediate_data;
1191
1192 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1193 if (rc < 0)
1194 return rc;
1195 else if (rc > 0)
1196 dump_payload = true;
1197
1198 if (!immed_data)
1199 return 0;
1200
1201 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1202}
1203
e48354ce
NB		 1204static u32 iscsit_do_crypto_hash_sg(
1205 struct hash_desc *hash,
1206 struct iscsi_cmd *cmd,
1207 u32 data_offset,
1208 u32 data_length,
1209 u32 padding,
1210 u8 *pad_bytes)
1211{
1212 u32 data_crc;
1213 u32 i;
1214 struct scatterlist *sg;
1215 unsigned int page_off;
1216
1217 crypto_hash_init(hash);
1218
1219 sg = cmd->first_data_sg;
1220 page_off = cmd->first_data_sg_off;
1221
1222 i = 0;
1223 while (data_length) {
1224 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1225
1226 crypto_hash_update(hash, &sg[i], cur_len);
1227
1228 data_length -= cur_len;
1229 page_off = 0;
1230 i++;
1231 }
1232
1233 if (padding) {
1234 struct scatterlist pad_sg;
1235
1236 sg_init_one(&pad_sg, pad_bytes, padding);
1237 crypto_hash_update(hash, &pad_sg, padding);
1238 }
1239 crypto_hash_final(hash, (u8 *) &data_crc);
1240
1241 return data_crc;
1242}
1243
1244static void iscsit_do_crypto_hash_buf(
1245 struct hash_desc *hash,
80690fdb 1246 const void *buf,
e48354ce
NB		 1247 u32 payload_length,
1248 u32 padding,
1249 u8 *pad_bytes,
1250 u8 *data_crc)
1251{
1252 struct scatterlist sg;
1253
1254 crypto_hash_init(hash);
1255
8359cf43 1256 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1257 crypto_hash_update(hash, &sg, payload_length);
1258
1259 if (padding) {
1260 sg_init_one(&sg, pad_bytes, padding);
1261 crypto_hash_update(hash, &sg, padding);
1262 }
1263 crypto_hash_final(hash, data_crc);
1264}
1265
3e1c81a9
NB		 1266int
1267iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1268 struct iscsi_cmd **out_cmd)
e48354ce 1269{
3e1c81a9 1270 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1271 struct iscsi_cmd *cmd = NULL;
1272 struct se_cmd *se_cmd;
3e1c81a9
NB		 1273 u32 payload_length = ntoh24(hdr->dlength);
1274 int rc;
e48354ce
NB		 1275
1276 if (!payload_length) {
dbcbc95c
NB		 1277 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1278 return 0;
e48354ce
NB		 1279 }
1280
1281 /* iSCSI write */
04f3b31b 1282 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1283
21f5aa7e 1284 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1285 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1286 " MaxXmitDataSegmentLength: %u\n", payload_length,
1287 conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1288 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1289 buf);
e48354ce
NB		 1290 }
1291
1292 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1293 payload_length);
1294 if (!cmd)
1295 return 0;
1296
1297 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1298 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1299 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1300 payload_length, conn->cid);
1301
1302 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1303 pr_err("Command ITT: 0x%08x received DataOUT after"
1304 " last DataOUT received, dumping payload\n",
1305 cmd->init_task_tag);
1306 return iscsit_dump_data_payload(conn, payload_length, 1);
1307 }
1308
1309 if (cmd->data_direction != DMA_TO_DEVICE) {
1310 pr_err("Command ITT: 0x%08x received DataOUT for a"
1311 " NON-WRITE command.\n", cmd->init_task_tag);
97c99b47 1312 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1313 }
1314 se_cmd = &cmd->se_cmd;
1315 iscsit_mod_dataout_timer(cmd);
1316
50e5c87d 1317 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1318 pr_err("DataOut Offset: %u, Length %u greater than"
1319 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1320 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1321 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1322 }
1323
1324 if (cmd->unsolicited_data) {
1325 int dump_unsolicited_data = 0;
1326
1327 if (conn->sess->sess_ops->InitialR2T) {
1328 pr_err("Received unexpected unsolicited data"
1329 " while InitialR2T=Yes, protocol error.\n");
1330 transport_send_check_condition_and_sense(&cmd->se_cmd,
1331 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1332 return -1;
1333 }
1334 /*
1335 * Special case for dealing with Unsolicited DataOUT
1336 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1337 * failures;
1338 */
1339
1340 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1341 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1342 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1343 dump_unsolicited_data = 1;
e48354ce
NB		 1344
1345 if (dump_unsolicited_data) {
1346 /*
1347 * Check if a delayed TASK_ABORTED status needs to
1348 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1349 * received with the unsolicitied data out.
1350 */
1351 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1352 iscsit_stop_dataout_timer(cmd);
1353
1354 transport_check_aborted_status(se_cmd,
1355 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1356 return iscsit_dump_data_payload(conn, payload_length, 1);
1357 }
1358 } else {
1359 /*
1360 * For the normal solicited data path:
1361 *
1362 * Check for a delayed TASK_ABORTED status and dump any
1363 * incoming data out payload if one exists. Also, when the
1364 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1365 * data out sequence, we decrement outstanding_r2ts. Once
1366 * outstanding_r2ts reaches zero, go ahead and send the delayed
1367 * TASK_ABORTED status.
1368 */
7d680f3b 1369 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1370 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371 if (--cmd->outstanding_r2ts < 1) {
1372 iscsit_stop_dataout_timer(cmd);
1373 transport_check_aborted_status(
1374 se_cmd, 1);
1375 }
1376
1377 return iscsit_dump_data_payload(conn, payload_length, 1);
1378 }
1379 }
1380 /*
1381 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1382 * within-command recovery checks before receiving the payload.
1383 */
3e1c81a9
NB		 1384 rc = iscsit_check_pre_dataout(cmd, buf);
1385 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1386 return 0;
3e1c81a9 1387 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1388 return -1;
1389
3e1c81a9
NB		 1390 *out_cmd = cmd;
1391 return 0;
1392}
1393EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1394
1395static int
1396iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1397 struct iscsi_data *hdr)
1398{
1399 struct kvec *iov;
1400 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1401 u32 payload_length = ntoh24(hdr->dlength);
1402 int iov_ret, data_crc_failed = 0;
1403
e48354ce
NB		 1404 rx_size += payload_length;
1405 iov = &cmd->iov_data[0];
1406
50e5c87d
CH		 1407 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1408 payload_length);
e48354ce
NB		 1409 if (iov_ret < 0)
1410 return -1;
1411
1412 iov_count += iov_ret;
1413
1414 padding = ((-payload_length) & 3);
1415 if (padding != 0) {
1416 iov[iov_count].iov_base = cmd->pad_bytes;
1417 iov[iov_count++].iov_len = padding;
1418 rx_size += padding;
1419 pr_debug("Receiving %u padding bytes.\n", padding);
1420 }
1421
1422 if (conn->conn_ops->DataDigest) {
1423 iov[iov_count].iov_base = &checksum;
1424 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1425 rx_size += ISCSI_CRC_LEN;
1426 }
1427
1428 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1429
1430 iscsit_unmap_iovec(cmd);
1431
1432 if (rx_got != rx_size)
1433 return -1;
1434
1435 if (conn->conn_ops->DataDigest) {
1436 u32 data_crc;
1437
1438 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1439 be32_to_cpu(hdr->offset),
1440 payload_length, padding,
e48354ce
NB		 1441 cmd->pad_bytes);
1442
1443 if (checksum != data_crc) {
1444 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1445 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1446 " does not match computed 0x%08x\n",
1447 hdr->itt, hdr->offset, payload_length,
1448 hdr->datasn, checksum, data_crc);
1449 data_crc_failed = 1;
1450 } else {
1451 pr_debug("Got CRC32C DataDigest 0x%08x for"
1452 " %u bytes of Data Out\n", checksum,
1453 payload_length);
1454 }
1455 }
3e1c81a9
NB		 1456
1457 return data_crc_failed;
1458}
1459
1460int
1461iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1462 bool data_crc_failed)
1463{
1464 struct iscsi_conn *conn = cmd->conn;
1465 int rc, ooo_cmdsn;
e48354ce
NB		 1466 /*
1467 * Increment post receive data and CRC values or perform
1468 * within-command recovery.
1469 */
3e1c81a9
NB		 1470 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1471 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1472 return 0;
3e1c81a9 1473 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1474 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1475 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1476 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1477 /*
1478 * Handle extra special case for out of order
1479 * Unsolicited Data Out.
1480 */
1481 spin_lock_bh(&cmd->istate_lock);
1482 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1483 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1484 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1485 spin_unlock_bh(&cmd->istate_lock);
1486
1487 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1488 if (ooo_cmdsn)
1489 return 0;
1490 target_execute_cmd(&cmd->se_cmd);
1491 return 0;
e48354ce
NB		 1492 } else /* DATAOUT_CANNOT_RECOVER */
1493 return -1;
1494
1495 return 0;
1496}
3e1c81a9 1497EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1498
3e1c81a9
NB		 1499static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1500{
dbcbc95c 1501 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1502 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1503 int rc;
1504 bool data_crc_failed = false;
1505
1506 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1507 if (rc < 0)
561bf158 1508 return 0;
3e1c81a9
NB		 1509 else if (!cmd)
1510 return 0;
1511
1512 rc = iscsit_get_dataout(conn, cmd, hdr);
1513 if (rc < 0)
1514 return rc;
1515 else if (rc > 0)
1516 data_crc_failed = true;
1517
1518 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1519}
1520
778de368
NB		 1521int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1522 struct iscsi_nopout *hdr)
e48354ce 1523{
778de368 1524 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1525
a3662605
AH		 1526 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1527 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1528 if (!cmd)
1529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1530 (unsigned char *)hdr);
1531
1532 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1533 (unsigned char *)hdr);
1534 }
1535
66c7db68 1536 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1537 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1538 " not set, protocol error.\n");
28aaa950
NB		 1539 if (!cmd)
1540 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1541 (unsigned char *)hdr);
1542
ba159914
NB		 1543 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1544 (unsigned char *)hdr);
e48354ce
NB		 1545 }
1546
21f5aa7e 1547 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1548 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1549 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1550 " error.\n", payload_length,
21f5aa7e 1551 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1552 if (!cmd)
1553 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1554 (unsigned char *)hdr);
1555
ba159914
NB		 1556 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1557 (unsigned char *)hdr);
e48354ce
NB		 1558 }
1559
3e1c81a9 1560 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1561 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1562 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1563 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1564 payload_length);
1565 /*
1566 * This is not a response to a Unsolicited NopIN, which means
1567 * it can either be a NOPOUT ping request (with a valid ITT),
1568 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1569 * Either way, make sure we allocate an struct iscsi_cmd, as both
1570 * can contain ping data.
1571 */
50e5c87d 1572 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1573 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1574 cmd->i_state = ISTATE_SEND_NOPIN;
1575 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1576 1 : 0);
1577 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1578 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1579 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1580 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1581 cmd->data_direction = DMA_NONE;
1582 }
1583
778de368
NB		 1584 return 0;
1585}
1586EXPORT_SYMBOL(iscsit_setup_nop_out);
1587
1588int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589 struct iscsi_nopout *hdr)
1590{
1591 struct iscsi_cmd *cmd_p = NULL;
1592 int cmdsn_ret = 0;
1593 /*
1594 * Initiator is expecting a NopIN ping reply..
1595 */
1596 if (hdr->itt != RESERVED_ITT) {
7cbfcc95
NB		 1597 if (!cmd)
1598 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1599 (unsigned char *)hdr);
778de368
NB		 1600
1601 spin_lock_bh(&conn->cmd_lock);
1602 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1603 spin_unlock_bh(&conn->cmd_lock);
1604
1605 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1606
1607 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1608 iscsit_add_cmd_to_response_queue(cmd, conn,
1609 cmd->i_state);
1610 return 0;
1611 }
1612
561bf158
NB		 1613 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1614 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1615 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1616 return 0;
778de368 1617 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1618 return -1;
778de368
NB		 1619
1620 return 0;
1621 }
1622 /*
1623 * This was a response to a unsolicited NOPIN ping.
1624 */
1625 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1626 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1627 if (!cmd_p)
1628 return -EINVAL;
1629
1630 iscsit_stop_nopin_response_timer(conn);
1631
1632 cmd_p->i_state = ISTATE_REMOVE;
1633 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1634
1635 iscsit_start_nopin_timer(conn);
1636 return 0;
1637 }
1638 /*
1639 * Otherwise, initiator is not expecting a NOPIN is response.
1640 * Just ignore for now.
1641 */
1642 return 0;
1643}
1644EXPORT_SYMBOL(iscsit_process_nop_out);
1645
1646static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1647 unsigned char *buf)
1648{
1649 unsigned char *ping_data = NULL;
1650 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1651 struct kvec *iov = NULL;
1652 u32 payload_length = ntoh24(hdr->dlength);
1653 int ret;
1654
1655 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1656 if (ret < 0)
561bf158 1657 return 0;
778de368
NB		 1658 /*
1659 * Handle NOP-OUT payload for traditional iSCSI sockets
1660 */
50e5c87d 1661 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1662 u32 checksum, data_crc, padding = 0;
1663 int niov = 0, rx_got, rx_size = payload_length;
1664
e48354ce
NB		 1665 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1666 if (!ping_data) {
1667 pr_err("Unable to allocate memory for"
1668 " NOPOUT ping data.\n");
1669 ret = -1;
1670 goto out;
1671 }
1672
1673 iov = &cmd->iov_misc[0];
1674 iov[niov].iov_base = ping_data;
1675 iov[niov++].iov_len = payload_length;
1676
1677 padding = ((-payload_length) & 3);
1678 if (padding != 0) {
1679 pr_debug("Receiving %u additional bytes"
1680 " for padding.\n", padding);
1681 iov[niov].iov_base = &cmd->pad_bytes;
1682 iov[niov++].iov_len = padding;
1683 rx_size += padding;
1684 }
1685 if (conn->conn_ops->DataDigest) {
1686 iov[niov].iov_base = &checksum;
1687 iov[niov++].iov_len = ISCSI_CRC_LEN;
1688 rx_size += ISCSI_CRC_LEN;
1689 }
1690
1691 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1692 if (rx_got != rx_size) {
1693 ret = -1;
1694 goto out;
1695 }
1696
1697 if (conn->conn_ops->DataDigest) {
1698 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1699 ping_data, payload_length,
1700 padding, cmd->pad_bytes,
1701 (u8 *)&data_crc);
1702
1703 if (checksum != data_crc) {
1704 pr_err("Ping data CRC32C DataDigest"
1705 " 0x%08x does not match computed 0x%08x\n",
1706 checksum, data_crc);
1707 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1708 pr_err("Unable to recover from"
1709 " NOPOUT Ping DataCRC failure while in"
1710 " ERL=0.\n");
1711 ret = -1;
1712 goto out;
1713 } else {
1714 /*
1715 * Silently drop this PDU and let the
1716 * initiator plug the CmdSN gap.
1717 */
1718 pr_debug("Dropping NOPOUT"
1719 " Command CmdSN: 0x%08x due to"
1720 " DataCRC error.\n", hdr->cmdsn);
1721 ret = 0;
1722 goto out;
1723 }
1724 } else {
1725 pr_debug("Got CRC32C DataDigest"
1726 " 0x%08x for %u bytes of ping data.\n",
1727 checksum, payload_length);
1728 }
1729 }
1730
1731 ping_data[payload_length] = '\0';
1732 /*
1733 * Attach ping data to struct iscsi_cmd->buf_ptr.
1734 */
8359cf43 1735 cmd->buf_ptr = ping_data;
e48354ce
NB		 1736 cmd->buf_ptr_size = payload_length;
1737
1738 pr_debug("Got %u bytes of NOPOUT ping"
1739 " data.\n", payload_length);
1740 pr_debug("Ping Data: \"%s\"\n", ping_data);
1741 }
1742
778de368 1743 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1744out:
1745 if (cmd)
aafc9d15 1746 iscsit_free_cmd(cmd, false);
778de368 1747
e48354ce
NB		 1748 kfree(ping_data);
1749 return ret;
1750}
1751
3e1c81a9
NB		 1752int
1753iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754 unsigned char *buf)
e48354ce 1755{
e48354ce
NB		 1756 struct se_tmr_req *se_tmr;
1757 struct iscsi_tmr_req *tmr_req;
1758 struct iscsi_tm *hdr;
186a9647
NB		 1759 int out_of_order_cmdsn = 0, ret;
1760 bool sess_ref = false;
e48354ce
NB		 1761 u8 function;
1762
1763 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1764 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1765 function = hdr->flags;
1766
1767 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1768 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1769 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1770 hdr->rtt, hdr->refcmdsn, conn->cid);
1771
1772 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1773 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1774 hdr->rtt != RESERVED_ITT)) {
e48354ce 1775 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1776 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1777 }
1778
1779 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1781 pr_err("Task Management Request TASK_REASSIGN not"
1782 " issued as immediate command, bad iSCSI Initiator"
1783 "implementation\n");
ba159914
NB		 1784 return iscsit_add_reject_cmd(cmd,
1785 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1786 }
1787 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1788 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1789 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1790
d28b1169
AG		 1791 cmd->data_direction = DMA_NONE;
1792
1793 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1794 if (!cmd->tmr_req) {
1795 pr_err("Unable to allocate memory for"
1796 " Task Management command!\n");
ba159914
NB		 1797 return iscsit_add_reject_cmd(cmd,
1798 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1799 buf);
d28b1169
AG		 1800 }
1801
1802 /*
1803 * TASK_REASSIGN for ERL=2 / connection stays inside of
1804 * LIO-Target $FABRIC_MOD
1805 */
1806 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1807
1808 u8 tcm_function;
1809 int ret;
1810
1811 transport_init_se_cmd(&cmd->se_cmd,
1812 &lio_target_fabric_configfs->tf_ops,
1813 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1814 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1815
186a9647
NB		 1816 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1817 sess_ref = true;
1818
d28b1169
AG		 1819 switch (function) {
1820 case ISCSI_TM_FUNC_ABORT_TASK:
1821 tcm_function = TMR_ABORT_TASK;
1822 break;
1823 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1824 tcm_function = TMR_ABORT_TASK_SET;
1825 break;
1826 case ISCSI_TM_FUNC_CLEAR_ACA:
1827 tcm_function = TMR_CLEAR_ACA;
1828 break;
1829 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1830 tcm_function = TMR_CLEAR_TASK_SET;
1831 break;
1832 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1833 tcm_function = TMR_LUN_RESET;
1834 break;
1835 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1836 tcm_function = TMR_TARGET_WARM_RESET;
1837 break;
1838 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1839 tcm_function = TMR_TARGET_COLD_RESET;
1840 break;
1841 default:
1842 pr_err("Unknown iSCSI TMR Function:"
1843 " 0x%02x\n", function);
ba159914
NB		 1844 return iscsit_add_reject_cmd(cmd,
1845 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1846 }
1847
1848 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1849 tcm_function, GFP_KERNEL);
1850 if (ret < 0)
ba159914
NB		 1851 return iscsit_add_reject_cmd(cmd,
1852 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1853
1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855 }
e48354ce
NB		 1856
1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860 cmd->init_task_tag = hdr->itt;
1861 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1864 se_tmr = cmd->se_cmd.se_tmr_req;
1865 tmr_req = cmd->tmr_req;
1866 /*
1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1868 */
1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871 scsilun_to_int(&hdr->lun));
e48354ce 1872 if (ret < 0) {
e48354ce
NB		 1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1874 goto attach;
1875 }
1876 }
1877
1878 switch (function) {
1879 case ISCSI_TM_FUNC_ABORT_TASK:
1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1881 if (se_tmr->response)
e48354ce 1882 goto attach;
e48354ce
NB		 1883 break;
1884 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885 case ISCSI_TM_FUNC_CLEAR_ACA:
1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1888 break;
1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892 goto attach;
1893 }
1894 break;
1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898 goto attach;
1899 }
1900 break;
1901 case ISCSI_TM_FUNC_TASK_REASSIGN:
1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1903 /*
1904 * Perform sanity checks on the ExpDataSN only if the
1905 * TASK_REASSIGN was successful.
1906 */
de103c93 1907 if (se_tmr->response)
e48354ce
NB		 1908 break;
1909
1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 1911 return iscsit_add_reject_cmd(cmd,
1912 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1913 break;
1914 default:
1915 pr_err("Unknown TMR function: 0x%02x, protocol"
1916 " error.\n", function);
e48354ce
NB		 1917 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1918 goto attach;
1919 }
1920
1921 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1922 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1923 se_tmr->call_transport = 1;
1924attach:
1925 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1926 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1927 spin_unlock_bh(&conn->cmd_lock);
1928
1929 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 1930 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1931 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1932 out_of_order_cmdsn = 1;
5a4c8666 1933 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1934 return 0;
5a4c8666 1935 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1936 return -1;
e48354ce 1937 }
50e5c87d 1938 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1939
5a4c8666 1940 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1941 return 0;
1942 /*
1943 * Found the referenced task, send to transport for processing.
1944 */
1945 if (se_tmr->call_transport)
1946 return transport_generic_handle_tmr(&cmd->se_cmd);
1947
1948 /*
1949 * Could not find the referenced LUN, task, or Task Management
1950 * command not authorized or supported. Change state and
1951 * let the tx_thread send the response.
1952 *
1953 * For connection recovery, this is also the default action for
1954 * TMR TASK_REASSIGN.
1955 */
186a9647
NB		 1956 if (sess_ref) {
1957 pr_debug("Handle TMR, using sess_ref=true check\n");
1958 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1959 }
1960
e48354ce
NB		 1961 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1962 return 0;
1963}
3e1c81a9 1964EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1965
1966/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 1967int
1968iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1969 struct iscsi_text *hdr)
e48354ce 1970{
64534aa7 1971 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1972
21f5aa7e 1973 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1974 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1975 "greater than MaxXmitDataSegmentLength %u.\n",
1976 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1977 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1978 (unsigned char *)hdr);
e48354ce
NB		 1979 }
1980
122f8afc
NB		 1981 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1982 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1983 pr_err("Multi sequence text commands currently not supported\n");
1984 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1985 (unsigned char *)hdr);
1986 }
1987
e48354ce
NB		 1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990 hdr->exp_statsn, payload_length);
1991
64534aa7
NB		 1992 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1993 cmd->i_state = ISTATE_SEND_TEXTRSP;
1994 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1995 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1996 cmd->targ_xfer_tag = 0xFFFFFFFF;
1997 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1998 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1999 cmd->data_direction = DMA_NONE;
2000
2001 return 0;
2002}
2003EXPORT_SYMBOL(iscsit_setup_text_cmd);
2004
2005int
2006iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2007 struct iscsi_text *hdr)
2008{
9864ca9d 2009 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2010 int cmdsn_ret;
2011
9864ca9d
NB		 2012 if (!text_in) {
2013 pr_err("Unable to locate text_in buffer for sendtargets"
2014 " discovery\n");
2015 goto reject;
2016 }
2017 if (strncmp("SendTargets", text_in, 11) != 0) {
2018 pr_err("Received Text Data that is not"
2019 " SendTargets, cannot continue.\n");
2020 goto reject;
2021 }
2022 text_ptr = strchr(text_in, '=');
2023 if (!text_ptr) {
2024 pr_err("No \"=\" separator found in Text Data,"
2025 " cannot continue.\n");
2026 goto reject;
2027 }
2028 if (!strncmp("=All", text_ptr, 4)) {
2029 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
6665889c
NB		 2030 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2031 !strncmp("=eui.", text_ptr, 5)) {
2032 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
9864ca9d
NB		 2033 } else {
2034 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2035 goto reject;
2036 }
2037
64534aa7
NB		 2038 spin_lock_bh(&conn->cmd_lock);
2039 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2040 spin_unlock_bh(&conn->cmd_lock);
2041
2042 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2043
2044 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2045 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2046 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2047 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2048 return -1;
2049
64534aa7
NB		 2050 return 0;
2051 }
2052
2053 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2054
2055reject:
ba159914
NB		 2056 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2057 (unsigned char *)hdr);
64534aa7
NB		 2058}
2059EXPORT_SYMBOL(iscsit_process_text_cmd);
2060
2061static int
2062iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2063 unsigned char *buf)
2064{
2065 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2066 char *text_in = NULL;
2067 u32 payload_length = ntoh24(hdr->dlength);
2068 int rx_size, rc;
2069
2070 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2071 if (rc < 0)
561bf158 2072 return 0;
64534aa7
NB		 2073
2074 rx_size = payload_length;
2075 if (payload_length) {
64534aa7
NB		 2076 u32 checksum = 0, data_crc = 0;
2077 u32 padding = 0, pad_bytes = 0;
2078 int niov = 0, rx_got;
2079 struct kvec iov[3];
2080
2081 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2082 if (!text_in) {
2083 pr_err("Unable to allocate memory for"
2084 " incoming text parameters\n");
64534aa7 2085 goto reject;
e48354ce 2086 }
9864ca9d 2087 cmd->text_in_ptr = text_in;
e48354ce
NB		 2088
2089 memset(iov, 0, 3 * sizeof(struct kvec));
2090 iov[niov].iov_base = text_in;
64534aa7 2091 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2092
2093 padding = ((-payload_length) & 3);
2094 if (padding != 0) {
76f1928e 2095 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2096 iov[niov++].iov_len = padding;
2097 rx_size += padding;
2098 pr_debug("Receiving %u additional bytes"
2099 " for padding.\n", padding);
2100 }
2101 if (conn->conn_ops->DataDigest) {
2102 iov[niov].iov_base = &checksum;
2103 iov[niov++].iov_len = ISCSI_CRC_LEN;
2104 rx_size += ISCSI_CRC_LEN;
2105 }
2106
2107 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2108 if (rx_got != rx_size)
2109 goto reject;
e48354ce
NB		 2110
2111 if (conn->conn_ops->DataDigest) {
2112 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
64534aa7 2113 text_in, payload_length,
76f1928e 2114 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2115 (u8 *)&data_crc);
2116
2117 if (checksum != data_crc) {
2118 pr_err("Text data CRC32C DataDigest"
2119 " 0x%08x does not match computed"
2120 " 0x%08x\n", checksum, data_crc);
2121 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2122 pr_err("Unable to recover from"
2123 " Text Data digest failure while in"
2124 " ERL=0.\n");
64534aa7 2125 goto reject;
e48354ce
NB		 2126 } else {
2127 /*
2128 * Silently drop this PDU and let the
2129 * initiator plug the CmdSN gap.
2130 */
2131 pr_debug("Dropping Text"
2132 " Command CmdSN: 0x%08x due to"
2133 " DataCRC error.\n", hdr->cmdsn);
2134 kfree(text_in);
2135 return 0;
2136 }
2137 } else {
2138 pr_debug("Got CRC32C DataDigest"
2139 " 0x%08x for %u bytes of text data.\n",
64534aa7 2140 checksum, payload_length);
e48354ce
NB		 2141 }
2142 }
64534aa7 2143 text_in[payload_length - 1] = '\0';
e48354ce 2144 pr_debug("Successfully read %d bytes of text"
64534aa7 2145 " data.\n", payload_length);
e48354ce
NB		 2146 }
2147
64534aa7 2148 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2149
64534aa7 2150reject:
9864ca9d
NB		 2151 kfree(cmd->text_in_ptr);
2152 cmd->text_in_ptr = NULL;
ba159914 2153 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce 2154}
64534aa7 2155EXPORT_SYMBOL(iscsit_handle_text_cmd);
e48354ce
NB		 2156
2157int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2158{
2159 struct iscsi_conn *conn_p;
2160 struct iscsi_session *sess = conn->sess;
2161
2162 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2163 " for SID: %u.\n", conn->cid, conn->sess->sid);
2164
2165 atomic_set(&sess->session_logout, 1);
2166 atomic_set(&conn->conn_logout_remove, 1);
2167 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2168
2169 iscsit_inc_conn_usage_count(conn);
2170 iscsit_inc_session_usage_count(sess);
2171
2172 spin_lock_bh(&sess->conn_lock);
2173 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2174 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2175 continue;
2176
2177 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2178 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2179 }
2180 spin_unlock_bh(&sess->conn_lock);
2181
2182 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2183
2184 return 0;
2185}
2186
2187int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2188{
2189 struct iscsi_conn *l_conn;
2190 struct iscsi_session *sess = conn->sess;
2191
2192 pr_debug("Received logout request CLOSECONNECTION for CID:"
2193 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2194
2195 /*
2196 * A Logout Request with a CLOSECONNECTION reason code for a CID
2197 * can arrive on a connection with a differing CID.
2198 */
2199 if (conn->cid == cmd->logout_cid) {
2200 spin_lock_bh(&conn->state_lock);
2201 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2202 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2203
2204 atomic_set(&conn->conn_logout_remove, 1);
2205 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2206 iscsit_inc_conn_usage_count(conn);
2207
2208 spin_unlock_bh(&conn->state_lock);
2209 } else {
2210 /*
2211 * Handle all different cid CLOSECONNECTION requests in
2212 * iscsit_logout_post_handler_diffcid() as to give enough
2213 * time for any non immediate command's CmdSN to be
2214 * acknowledged on the connection in question.
2215 *
2216 * Here we simply make sure the CID is still around.
2217 */
2218 l_conn = iscsit_get_conn_from_cid(sess,
2219 cmd->logout_cid);
2220 if (!l_conn) {
2221 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2222 iscsit_add_cmd_to_response_queue(cmd, conn,
2223 cmd->i_state);
2224 return 0;
2225 }
2226
2227 iscsit_dec_conn_usage_count(l_conn);
2228 }
2229
2230 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2231
2232 return 0;
2233}
2234
2235int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2236{
2237 struct iscsi_session *sess = conn->sess;
2238
2239 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2240 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2241
2242 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2243 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2244 " while ERL!=2.\n");
2245 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2246 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247 return 0;
2248 }
2249
2250 if (conn->cid == cmd->logout_cid) {
2251 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2252 " with CID: %hu on CID: %hu, implementation error.\n",
2253 cmd->logout_cid, conn->cid);
2254 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2255 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2256 return 0;
2257 }
2258
2259 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2260
2261 return 0;
2262}
2263
3e1c81a9
NB		 2264int
2265iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2266 unsigned char *buf)
e48354ce
NB		 2267{
2268 int cmdsn_ret, logout_remove = 0;
2269 u8 reason_code = 0;
e48354ce
NB		 2270 struct iscsi_logout *hdr;
2271 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2272
2273 hdr = (struct iscsi_logout *) buf;
2274 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2275
2276 if (tiqn) {
2277 spin_lock(&tiqn->logout_stats.lock);
2278 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2279 tiqn->logout_stats.normal_logouts++;
2280 else
2281 tiqn->logout_stats.abnormal_logouts++;
2282 spin_unlock(&tiqn->logout_stats.lock);
2283 }
2284
2285 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2286 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2287 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2288 hdr->cid, conn->cid);
2289
2290 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2291 pr_err("Received logout request on connection that"
2292 " is not in logged in state, ignoring request.\n");
aafc9d15 2293 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2294 return 0;
2295 }
2296
e48354ce
NB		 2297 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2298 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2299 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2300 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2301 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2302 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2303 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2304 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2305 cmd->logout_reason = reason_code;
2306 cmd->data_direction = DMA_NONE;
2307
2308 /*
2309 * We need to sleep in these cases (by returning 1) until the Logout
2310 * Response gets sent in the tx thread.
2311 */
2312 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2313 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2314 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2315 logout_remove = 1;
2316
2317 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2318 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2319 spin_unlock_bh(&conn->cmd_lock);
2320
2321 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2322 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2323
2324 /*
2325 * Immediate commands are executed, well, immediately.
2326 * Non-Immediate Logout Commands are executed in CmdSN order.
2327 */
c6037cc5 2328 if (cmd->immediate_cmd) {
e48354ce
NB		 2329 int ret = iscsit_execute_cmd(cmd, 0);
2330
2331 if (ret < 0)
2332 return ret;
2333 } else {
561bf158 2334 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2335 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2336 logout_remove = 0;
ba159914
NB		 2337 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2338 return -1;
e48354ce
NB		 2339 }
2340
2341 return logout_remove;
2342}
3e1c81a9 2343EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2344
2345static int iscsit_handle_snack(
2346 struct iscsi_conn *conn,
2347 unsigned char *buf)
2348{
e48354ce
NB		 2349 struct iscsi_snack *hdr;
2350
2351 hdr = (struct iscsi_snack *) buf;
2352 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2353
2354 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2355 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2356 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2357 hdr->begrun, hdr->runlength, conn->cid);
2358
2359 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2360 pr_err("Initiator sent SNACK request while in"
2361 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2362 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2363 buf);
e48354ce
NB		 2364 }
2365 /*
2366 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2367 * call from inside iscsi_send_recovery_datain_or_r2t().
2368 */
2369 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2370 case 0:
2371 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2372 hdr->itt,
2373 be32_to_cpu(hdr->ttt),
2374 be32_to_cpu(hdr->begrun),
2375 be32_to_cpu(hdr->runlength));
e48354ce 2376 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2377 return iscsit_handle_status_snack(conn, hdr->itt,
2378 be32_to_cpu(hdr->ttt),
2379 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2380 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2381 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2382 be32_to_cpu(hdr->begrun),
2383 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2384 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2385 /* FIXME: Support R-Data SNACK */
2386 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2387 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2388 buf);
e48354ce
NB		 2389 default:
2390 pr_err("Unknown SNACK type 0x%02x, protocol"
2391 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2392 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2393 buf);
e48354ce
NB		 2394 }
2395
2396 return 0;
2397}
2398
2399static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2400{
2401 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2402 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2403 wait_for_completion_interruptible_timeout(
2404 &conn->rx_half_close_comp,
2405 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2406 }
2407}
2408
2409static int iscsit_handle_immediate_data(
2410 struct iscsi_cmd *cmd,
3e1c81a9 2411 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2412 u32 length)
2413{
2414 int iov_ret, rx_got = 0, rx_size = 0;
2415 u32 checksum, iov_count = 0, padding = 0;
2416 struct iscsi_conn *conn = cmd->conn;
2417 struct kvec *iov;
2418
2419 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2420 if (iov_ret < 0)
2421 return IMMEDIATE_DATA_CANNOT_RECOVER;
2422
2423 rx_size = length;
2424 iov_count = iov_ret;
2425 iov = &cmd->iov_data[0];
2426
2427 padding = ((-length) & 3);
2428 if (padding != 0) {
2429 iov[iov_count].iov_base = cmd->pad_bytes;
2430 iov[iov_count++].iov_len = padding;
2431 rx_size += padding;
2432 }
2433
2434 if (conn->conn_ops->DataDigest) {
2435 iov[iov_count].iov_base = &checksum;
2436 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2437 rx_size += ISCSI_CRC_LEN;
2438 }
2439
2440 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2441
2442 iscsit_unmap_iovec(cmd);
2443
2444 if (rx_got != rx_size) {
2445 iscsit_rx_thread_wait_for_tcp(conn);
2446 return IMMEDIATE_DATA_CANNOT_RECOVER;
2447 }
2448
2449 if (conn->conn_ops->DataDigest) {
2450 u32 data_crc;
2451
2452 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2453 cmd->write_data_done, length, padding,
2454 cmd->pad_bytes);
2455
2456 if (checksum != data_crc) {
2457 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2458 " does not match computed 0x%08x\n", checksum,
2459 data_crc);
2460
2461 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2462 pr_err("Unable to recover from"
2463 " Immediate Data digest failure while"
2464 " in ERL=0.\n");
ba159914 2465 iscsit_reject_cmd(cmd,
e48354ce 2466 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2467 (unsigned char *)hdr);
e48354ce
NB		 2468 return IMMEDIATE_DATA_CANNOT_RECOVER;
2469 } else {
ba159914 2470 iscsit_reject_cmd(cmd,
e48354ce 2471 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2472 (unsigned char *)hdr);
e48354ce
NB		 2473 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2474 }
2475 } else {
2476 pr_debug("Got CRC32C DataDigest 0x%08x for"
2477 " %u bytes of Immediate Data\n", checksum,
2478 length);
2479 }
2480 }
2481
2482 cmd->write_data_done += length;
2483
ebf1d95c 2484 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2485 spin_lock_bh(&cmd->istate_lock);
2486 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2487 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2488 spin_unlock_bh(&cmd->istate_lock);
2489 }
2490
2491 return IMMEDIATE_DATA_NORMAL_OPERATION;
2492}
2493
2494/*
2495 * Called with sess->conn_lock held.
2496 */
2497/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2498 with active network interface */
2499static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2500{
2501 struct iscsi_cmd *cmd;
2502 struct iscsi_conn *conn_p;
d444edc6 2503 bool found = false;
e48354ce
NB		 2504
2505 /*
2506 * Only send a Asynchronous Message on connections whos network
2507 * interface is still functional.
2508 */
2509 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2510 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2511 iscsit_inc_conn_usage_count(conn_p);
d444edc6 2512 found = true;
e48354ce
NB		 2513 break;
2514 }
2515 }
2516
d444edc6 2517 if (!found)
e48354ce
NB		 2518 return;
2519
676687c6 2520 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2521 if (!cmd) {
2522 iscsit_dec_conn_usage_count(conn_p);
2523 return;
2524 }
2525
2526 cmd->logout_cid = conn->cid;
2527 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2528 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2529
2530 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2531 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2532 spin_unlock_bh(&conn_p->cmd_lock);
2533
2534 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2535 iscsit_dec_conn_usage_count(conn_p);
2536}
2537
2538static int iscsit_send_conn_drop_async_message(
2539 struct iscsi_cmd *cmd,
2540 struct iscsi_conn *conn)
2541{
2542 struct iscsi_async *hdr;
2543
2544 cmd->tx_size = ISCSI_HDR_LEN;
2545 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2546
2547 hdr = (struct iscsi_async *) cmd->pdu;
2548 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2549 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2550 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2551 cmd->targ_xfer_tag = 0xFFFFFFFF;
2552 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2553 cmd->stat_sn = conn->stat_sn++;
2554 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2556 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2557 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2558 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2559 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2560 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2561
2562 if (conn->conn_ops->HeaderDigest) {
2563 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2564
80690fdb
GU		 2565 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2566 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2567
2568 cmd->tx_size += ISCSI_CRC_LEN;
2569 pr_debug("Attaching CRC32C HeaderDigest to"
2570 " Async Message 0x%08x\n", *header_digest);
2571 }
2572
2573 cmd->iov_misc[0].iov_base = cmd->pdu;
2574 cmd->iov_misc[0].iov_len = cmd->tx_size;
2575 cmd->iov_misc_count = 1;
2576
2577 pr_debug("Sending Connection Dropped Async Message StatSN:"
2578 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2579 cmd->logout_cid, conn->cid);
2580 return 0;
2581}
2582
6f3c0e69
AG		 2583static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2584{
2585 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2586 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2587 wait_for_completion_interruptible_timeout(
2588 &conn->tx_half_close_comp,
2589 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2590 }
2591}
2592
2ec5a8c1
NB		 2593static void
2594iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2595 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2596 bool set_statsn)
e48354ce 2597{
2ec5a8c1
NB		 2598 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2599 hdr->flags = datain->flags;
2600 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2601 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2602 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2603 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2605 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607 }
2608 }
2609 hton24(hdr->dlength, datain->length);
2610 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2611 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2612 (struct scsi_lun *)&hdr->lun);
2613 else
2614 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2615
2616 hdr->itt = cmd->init_task_tag;
2617
2618 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2619 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2620 else
2621 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2622 if (set_statsn)
2623 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2624 else
2625 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2626
2627 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2628 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2629 hdr->datasn = cpu_to_be32(datain->data_sn);
2630 hdr->offset = cpu_to_be32(datain->offset);
2631
2632 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2633 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2634 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2635 ntohl(hdr->offset), datain->length, conn->cid);
2636}
2637
2638static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2639{
2640 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2641 struct iscsi_datain datain;
2642 struct iscsi_datain_req *dr;
e48354ce 2643 struct kvec *iov;
2ec5a8c1
NB		 2644 u32 iov_count = 0, tx_size = 0;
2645 int eodr = 0, ret, iov_ret;
2646 bool set_statsn = false;
e48354ce
NB		 2647
2648 memset(&datain, 0, sizeof(struct iscsi_datain));
2649 dr = iscsit_get_datain_values(cmd, &datain);
2650 if (!dr) {
2651 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2652 cmd->init_task_tag);
2653 return -1;
2654 }
e48354ce
NB		 2655 /*
2656 * Be paranoid and double check the logic for now.
2657 */
ebf1d95c 2658 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2659 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2660 " datain.length: %u exceeds cmd->data_length: %u\n",
2661 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2662 cmd->se_cmd.data_length);
e48354ce
NB		 2663 return -1;
2664 }
2665
04f3b31b 2666 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2667 /*
2668 * Special case for successfully execution w/ both DATAIN
2669 * and Sense Data.
2670 */
2671 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2672 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2673 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2674 else {
2675 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2676 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2677 iscsit_increment_maxcmdsn(cmd, conn->sess);
2678 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2679 set_statsn = true;
e48354ce 2680 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2681 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2682 set_statsn = true;
e48354ce
NB		 2683 }
2684
2ec5a8c1 2685 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2686
2687 iov = &cmd->iov_data[0];
2688 iov[iov_count].iov_base = cmd->pdu;
2689 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2690 tx_size += ISCSI_HDR_LEN;
2691
2692 if (conn->conn_ops->HeaderDigest) {
2693 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2694
80690fdb
GU		 2695 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2696 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2697
2698 iov[0].iov_len += ISCSI_CRC_LEN;
2699 tx_size += ISCSI_CRC_LEN;
2700
2701 pr_debug("Attaching CRC32 HeaderDigest"
2702 " for DataIN PDU 0x%08x\n", *header_digest);
2703 }
2704
2ec5a8c1
NB		 2705 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2706 datain.offset, datain.length);
e48354ce
NB		 2707 if (iov_ret < 0)
2708 return -1;
2709
2710 iov_count += iov_ret;
2711 tx_size += datain.length;
2712
2713 cmd->padding = ((-datain.length) & 3);
2714 if (cmd->padding) {
2715 iov[iov_count].iov_base = cmd->pad_bytes;
2716 iov[iov_count++].iov_len = cmd->padding;
2717 tx_size += cmd->padding;
2718
2719 pr_debug("Attaching %u padding bytes\n",
2720 cmd->padding);
2721 }
2722 if (conn->conn_ops->DataDigest) {
2723 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2724 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2725
2726 iov[iov_count].iov_base = &cmd->data_crc;
2727 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2728 tx_size += ISCSI_CRC_LEN;
2729
2730 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2731 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2732 }
2733
2734 cmd->iov_data_count = iov_count;
2735 cmd->tx_size = tx_size;
2736
6f3c0e69
AG		 2737 /* sendpage is preferred but can't insert markers */
2738 if (!conn->conn_ops->IFMarker)
2739 ret = iscsit_fe_sendpage_sg(cmd, conn);
2740 else
2741 ret = iscsit_send_tx_data(cmd, conn, 0);
2742
2743 iscsit_unmap_iovec(cmd);
2744
2745 if (ret < 0) {
2746 iscsit_tx_thread_wait_for_tcp(conn);
2747 return ret;
2748 }
2749
e48354ce 2750 if (dr->dr_complete) {
6f3c0e69 2751 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2752 2 : 1;
2753 iscsit_free_datain_req(cmd, dr);
2754 }
2755
6f3c0e69 2756 return eodr;
e48354ce
NB		 2757}
2758
2ec5a8c1
NB		 2759int
2760iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2761 struct iscsi_logout_rsp *hdr)
e48354ce 2762{
e48354ce
NB		 2763 struct iscsi_conn *logout_conn = NULL;
2764 struct iscsi_conn_recovery *cr = NULL;
2765 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2766 /*
2767 * The actual shutting down of Sessions and/or Connections
2768 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2769 * is done in scsi_logout_post_handler().
2770 */
2771 switch (cmd->logout_reason) {
2772 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2773 pr_debug("iSCSI session logout successful, setting"
2774 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2775 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2776 break;
2777 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2778 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2779 break;
2780 /*
2781 * For CLOSECONNECTION logout requests carrying
2782 * a matching logout CID -> local CID, the reference
2783 * for the local CID will have been incremented in
2784 * iscsi_logout_closeconnection().
2785 *
2786 * For CLOSECONNECTION logout requests carrying
2787 * a different CID than the connection it arrived
2788 * on, the connection responding to cmd->logout_cid
2789 * is stopped in iscsit_logout_post_handler_diffcid().
2790 */
2791
2792 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2793 " successful.\n", cmd->logout_cid, conn->cid);
2794 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2795 break;
2796 case ISCSI_LOGOUT_REASON_RECOVERY:
2797 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2798 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2799 break;
2800 /*
2801 * If the connection is still active from our point of view
2802 * force connection recovery to occur.
2803 */
2804 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2805 cmd->logout_cid);
ee1b1b9c 2806 if (logout_conn) {
e48354ce
NB		 2807 iscsit_connection_reinstatement_rcfr(logout_conn);
2808 iscsit_dec_conn_usage_count(logout_conn);
2809 }
2810
2811 cr = iscsit_get_inactive_connection_recovery_entry(
2812 conn->sess, cmd->logout_cid);
2813 if (!cr) {
2814 pr_err("Unable to locate CID: %hu for"
2815 " REMOVECONNFORRECOVERY Logout Request.\n",
2816 cmd->logout_cid);
2817 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2818 break;
2819 }
2820
2821 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2822
2823 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2824 " for recovery for CID: %hu on CID: %hu successful.\n",
2825 cmd->logout_cid, conn->cid);
2826 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2827 break;
2828 default:
2829 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2830 cmd->logout_reason);
2831 return -1;
2832 }
2833
e48354ce
NB		 2834 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2835 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2836 hdr->response = cmd->logout_response;
66c7db68 2837 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2838 cmd->stat_sn = conn->stat_sn++;
2839 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2840
2841 iscsit_increment_maxcmdsn(cmd, conn->sess);
2842 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2843 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2844
2ec5a8c1
NB		 2845 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2846 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2847 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2848 cmd->logout_cid, conn->cid);
2849
2850 return 0;
2851}
2852EXPORT_SYMBOL(iscsit_build_logout_rsp);
2853
2854static int
2855iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2856{
2857 struct kvec *iov;
2858 int niov = 0, tx_size, rc;
2859
2860 rc = iscsit_build_logout_rsp(cmd, conn,
2861 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2862 if (rc < 0)
2863 return rc;
2864
2865 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2866 iov = &cmd->iov_misc[0];
2867 iov[niov].iov_base = cmd->pdu;
2868 iov[niov++].iov_len = ISCSI_HDR_LEN;
2869
2870 if (conn->conn_ops->HeaderDigest) {
2871 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2872
80690fdb
GU		 2873 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2874 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2875
2876 iov[0].iov_len += ISCSI_CRC_LEN;
2877 tx_size += ISCSI_CRC_LEN;
2878 pr_debug("Attaching CRC32C HeaderDigest to"
2879 " Logout Response 0x%08x\n", *header_digest);
2880 }
2881 cmd->iov_misc_count = niov;
2882 cmd->tx_size = tx_size;
2883
e48354ce
NB		 2884 return 0;
2885}
2886
2ec5a8c1
NB		 2887void
2888iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2889 struct iscsi_nopin *hdr, bool nopout_response)
2890{
2891 hdr->opcode = ISCSI_OP_NOOP_IN;
2892 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2893 hton24(hdr->dlength, cmd->buf_ptr_size);
2894 if (nopout_response)
2895 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2896 hdr->itt = cmd->init_task_tag;
2897 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2898 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2899 conn->stat_sn;
2900 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2901
2902 if (nopout_response)
2903 iscsit_increment_maxcmdsn(cmd, conn->sess);
2904
2905 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2906 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2907
2908 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2909 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2910 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2911 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2912}
2913EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2914
e48354ce
NB		 2915/*
2916 * Unsolicited NOPIN, either requesting a response or not.
2917 */
2918static int iscsit_send_unsolicited_nopin(
2919 struct iscsi_cmd *cmd,
2920 struct iscsi_conn *conn,
2921 int want_response)
2922{
2ec5a8c1
NB		 2923 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2924 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2925
2ec5a8c1 2926 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2927
2928 if (conn->conn_ops->HeaderDigest) {
2929 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2930
80690fdb
GU		 2931 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2932 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2933
2934 tx_size += ISCSI_CRC_LEN;
2935 pr_debug("Attaching CRC32C HeaderDigest to"
2936 " NopIN 0x%08x\n", *header_digest);
2937 }
2938
2939 cmd->iov_misc[0].iov_base = cmd->pdu;
2940 cmd->iov_misc[0].iov_len = tx_size;
2941 cmd->iov_misc_count = 1;
2942 cmd->tx_size = tx_size;
2943
2944 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2945 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2946
6f3c0e69
AG		 2947 ret = iscsit_send_tx_data(cmd, conn, 1);
2948 if (ret < 0) {
2949 iscsit_tx_thread_wait_for_tcp(conn);
2950 return ret;
2951 }
2952
2953 spin_lock_bh(&cmd->istate_lock);
2954 cmd->i_state = want_response ?
2955 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2956 spin_unlock_bh(&cmd->istate_lock);
2957
e48354ce
NB		 2958 return 0;
2959}
2960
2ec5a8c1
NB		 2961static int
2962iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2963{
2ec5a8c1 2964 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2965 struct kvec *iov;
2ec5a8c1
NB		 2966 u32 padding = 0;
2967 int niov = 0, tx_size;
e48354ce 2968
2ec5a8c1 2969 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2970
2ec5a8c1 2971 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2972 iov = &cmd->iov_misc[0];
2973 iov[niov].iov_base = cmd->pdu;
2974 iov[niov++].iov_len = ISCSI_HDR_LEN;
2975
2976 if (conn->conn_ops->HeaderDigest) {
2977 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2978
80690fdb
GU		 2979 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2980 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2981
2982 iov[0].iov_len += ISCSI_CRC_LEN;
2983 tx_size += ISCSI_CRC_LEN;
2984 pr_debug("Attaching CRC32C HeaderDigest"
2985 " to NopIn 0x%08x\n", *header_digest);
2986 }
2987
2988 /*
2989 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2990 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2991 */
2992 if (cmd->buf_ptr_size) {
2993 iov[niov].iov_base = cmd->buf_ptr;
2994 iov[niov++].iov_len = cmd->buf_ptr_size;
2995 tx_size += cmd->buf_ptr_size;
2996
2997 pr_debug("Echoing back %u bytes of ping"
2998 " data.\n", cmd->buf_ptr_size);
2999
3000 padding = ((-cmd->buf_ptr_size) & 3);
3001 if (padding != 0) {
3002 iov[niov].iov_base = &cmd->pad_bytes;
3003 iov[niov++].iov_len = padding;
3004 tx_size += padding;
3005 pr_debug("Attaching %u additional"
3006 " padding bytes.\n", padding);
3007 }
3008 if (conn->conn_ops->DataDigest) {
3009 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3010 cmd->buf_ptr, cmd->buf_ptr_size,
3011 padding, (u8 *)&cmd->pad_bytes,
3012 (u8 *)&cmd->data_crc);
3013
3014 iov[niov].iov_base = &cmd->data_crc;
3015 iov[niov++].iov_len = ISCSI_CRC_LEN;
3016 tx_size += ISCSI_CRC_LEN;
3017 pr_debug("Attached DataDigest for %u"
3018 " bytes of ping data, CRC 0x%08x\n",
3019 cmd->buf_ptr_size, cmd->data_crc);
3020 }
3021 }
3022
3023 cmd->iov_misc_count = niov;
3024 cmd->tx_size = tx_size;
3025
e48354ce
NB		 3026 return 0;
3027}
3028
6f3c0e69 3029static int iscsit_send_r2t(
e48354ce
NB		 3030 struct iscsi_cmd *cmd,
3031 struct iscsi_conn *conn)
3032{
3033 int tx_size = 0;
3034 struct iscsi_r2t *r2t;
3035 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3036 int ret;
e48354ce
NB		 3037
3038 r2t = iscsit_get_r2t_from_list(cmd);
3039 if (!r2t)
3040 return -1;
3041
3042 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3043 memset(hdr, 0, ISCSI_HDR_LEN);
3044 hdr->opcode = ISCSI_OP_R2T;
3045 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3046 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3047 (struct scsi_lun *)&hdr->lun);
66c7db68 3048 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3049 spin_lock_bh(&conn->sess->ttt_lock);
3050 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3051 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3052 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3053 spin_unlock_bh(&conn->sess->ttt_lock);
3054 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3055 hdr->statsn = cpu_to_be32(conn->stat_sn);
3056 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3057 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3058 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3059 hdr->data_offset = cpu_to_be32(r2t->offset);
3060 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3061
3062 cmd->iov_misc[0].iov_base = cmd->pdu;
3063 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3064 tx_size += ISCSI_HDR_LEN;
3065
3066 if (conn->conn_ops->HeaderDigest) {
3067 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3068
80690fdb
GU		 3069 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3070 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3071
3072 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3073 tx_size += ISCSI_CRC_LEN;
3074 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3075 " PDU 0x%08x\n", *header_digest);
3076 }
3077
3078 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3079 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3080 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3081 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3082 r2t->offset, r2t->xfer_len, conn->cid);
3083
3084 cmd->iov_misc_count = 1;
3085 cmd->tx_size = tx_size;
3086
3087 spin_lock_bh(&cmd->r2t_lock);
3088 r2t->sent_r2t = 1;
3089 spin_unlock_bh(&cmd->r2t_lock);
3090
6f3c0e69
AG		 3091 ret = iscsit_send_tx_data(cmd, conn, 1);
3092 if (ret < 0) {
3093 iscsit_tx_thread_wait_for_tcp(conn);
3094 return ret;
3095 }
3096
3097 spin_lock_bh(&cmd->dataout_timeout_lock);
3098 iscsit_start_dataout_timer(cmd, conn);
3099 spin_unlock_bh(&cmd->dataout_timeout_lock);
3100
e48354ce
NB		 3101 return 0;
3102}
3103
3104/*
8b1e1244
AG		 3105 * @recovery: If called from iscsi_task_reassign_complete_write() for
3106 * connection recovery.
e48354ce
NB		 3107 */
3108int iscsit_build_r2ts_for_cmd(
e48354ce 3109 struct iscsi_conn *conn,
3e1c81a9 3110 struct iscsi_cmd *cmd,
8b1e1244 3111 bool recovery)
e48354ce
NB		 3112{
3113 int first_r2t = 1;
3114 u32 offset = 0, xfer_len = 0;
3115
3116 spin_lock_bh(&cmd->r2t_lock);
3117 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3118 spin_unlock_bh(&cmd->r2t_lock);
3119 return 0;
3120 }
3121
8b1e1244
AG		 3122 if (conn->sess->sess_ops->DataSequenceInOrder &&
3123 !recovery)
c6037cc5 3124 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3125
3126 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3127 if (conn->sess->sess_ops->DataSequenceInOrder) {
3128 offset = cmd->r2t_offset;
3129
8b1e1244
AG		 3130 if (first_r2t && recovery) {
3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength -
3133 cmd->next_burst_len;
3134
ebf1d95c
AG		 3135 if (new_data_end > cmd->se_cmd.data_length)
3136 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3137 else
3138 xfer_len =
3139 conn->sess->sess_ops->MaxBurstLength -
3140 cmd->next_burst_len;
e48354ce 3141 } else {
8b1e1244
AG		 3142 int new_data_end = offset +
3143 conn->sess->sess_ops->MaxBurstLength;
3144
ebf1d95c
AG		 3145 if (new_data_end > cmd->se_cmd.data_length)
3146 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3147 else
3148 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3149 }
3150 cmd->r2t_offset += xfer_len;
3151
ebf1d95c 3152 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3154 } else {
3155 struct iscsi_seq *seq;
3156
3157 seq = iscsit_get_seq_holder_for_r2t(cmd);
3158 if (!seq) {
3159 spin_unlock_bh(&cmd->r2t_lock);
3160 return -1;
3161 }
3162
3163 offset = seq->offset;
3164 xfer_len = seq->xfer_len;
3165
3166 if (cmd->seq_send_order == cmd->seq_count)
3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3168 }
3169 cmd->outstanding_r2ts++;
3170 first_r2t = 0;
3171
3172 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3173 spin_unlock_bh(&cmd->r2t_lock);
3174 return -1;
3175 }
3176
3177 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3178 break;
3179 }
3180 spin_unlock_bh(&cmd->r2t_lock);
3181
3182 return 0;
3183}
3184
2ec5a8c1
NB		 3185void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3186 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3187{
2ec5a8c1 3188 if (inc_stat_sn)
e48354ce
NB		 3189 cmd->stat_sn = conn->stat_sn++;
3190
04f3b31b 3191 atomic_long_inc(&conn->sess->rsp_pdus);
e48354ce 3192
e48354ce
NB		 3193 memset(hdr, 0, ISCSI_HDR_LEN);
3194 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3195 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3196 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3197 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3198 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3199 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3200 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3202 }
3203 hdr->response = cmd->iscsi_response;
3204 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3205 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3206 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3207
3208 iscsit_increment_maxcmdsn(cmd, conn->sess);
3209 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3210 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3211
2ec5a8c1
NB		 3212 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3213 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3214 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3215 cmd->se_cmd.scsi_status, conn->cid);
3216}
3217EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3218
3219static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3220{
3221 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3222 struct kvec *iov;
3223 u32 padding = 0, tx_size = 0;
3224 int iov_count = 0;
3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3226
3227 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3228
e48354ce
NB		 3229 iov = &cmd->iov_misc[0];
3230 iov[iov_count].iov_base = cmd->pdu;
3231 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3232 tx_size += ISCSI_HDR_LEN;
3233
3234 /*
3235 * Attach SENSE DATA payload to iSCSI Response PDU
3236 */
3237 if (cmd->se_cmd.sense_buffer &&
3238 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3239 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3240 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3241 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3242
e48354ce 3243 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3244 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3245 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3246 iov[iov_count++].iov_len =
3247 (cmd->se_cmd.scsi_sense_length + padding);
3248 tx_size += cmd->se_cmd.scsi_sense_length;
3249
3250 if (padding) {
9c58b7dd 3251 memset(cmd->sense_buffer +
e48354ce
NB		 3252 cmd->se_cmd.scsi_sense_length, 0, padding);
3253 tx_size += padding;
3254 pr_debug("Adding %u bytes of padding to"
3255 " SENSE.\n", padding);
3256 }
3257
3258 if (conn->conn_ops->DataDigest) {
3259 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3260 cmd->sense_buffer,
e48354ce
NB		 3261 (cmd->se_cmd.scsi_sense_length + padding),
3262 0, NULL, (u8 *)&cmd->data_crc);
3263
3264 iov[iov_count].iov_base = &cmd->data_crc;
3265 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3266 tx_size += ISCSI_CRC_LEN;
3267
3268 pr_debug("Attaching CRC32 DataDigest for"
3269 " SENSE, %u bytes CRC 0x%08x\n",
3270 (cmd->se_cmd.scsi_sense_length + padding),
3271 cmd->data_crc);
3272 }
3273
3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275 " Response PDU\n",
3276 cmd->se_cmd.scsi_sense_length);
3277 }
3278
3279 if (conn->conn_ops->HeaderDigest) {
3280 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3281
80690fdb
GU		 3282 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3283 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3284
3285 iov[0].iov_len += ISCSI_CRC_LEN;
3286 tx_size += ISCSI_CRC_LEN;
3287 pr_debug("Attaching CRC32 HeaderDigest for Response"
3288 " PDU 0x%08x\n", *header_digest);
3289 }
3290
3291 cmd->iov_misc_count = iov_count;
3292 cmd->tx_size = tx_size;
3293
e48354ce
NB		 3294 return 0;
3295}
3296
3297static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3298{
3299 switch (se_tmr->response) {
3300 case TMR_FUNCTION_COMPLETE:
3301 return ISCSI_TMF_RSP_COMPLETE;
3302 case TMR_TASK_DOES_NOT_EXIST:
3303 return ISCSI_TMF_RSP_NO_TASK;
3304 case TMR_LUN_DOES_NOT_EXIST:
3305 return ISCSI_TMF_RSP_NO_LUN;
3306 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3307 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3308 case TMR_FUNCTION_REJECTED:
3309 default:
3310 return ISCSI_TMF_RSP_REJECTED;
3311 }
3312}
3313
2ec5a8c1
NB		 3314void
3315iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3316 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3317{
3318 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3319
e48354ce 3320 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3321 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3322 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3323 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3324 cmd->stat_sn = conn->stat_sn++;
3325 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3326
3327 iscsit_increment_maxcmdsn(cmd, conn->sess);
3328 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3329 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3330
2ec5a8c1
NB		 3331 pr_debug("Built Task Management Response ITT: 0x%08x,"
3332 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3333 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3334}
3335EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3336
3337static int
3338iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3339{
3340 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3341 u32 tx_size = 0;
3342
3343 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3344
e48354ce
NB		 3345 cmd->iov_misc[0].iov_base = cmd->pdu;
3346 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3347 tx_size += ISCSI_HDR_LEN;
3348
3349 if (conn->conn_ops->HeaderDigest) {
3350 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3351
80690fdb
GU		 3352 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3353 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3354
3355 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3356 tx_size += ISCSI_CRC_LEN;
3357 pr_debug("Attaching CRC32 HeaderDigest for Task"
3358 " Mgmt Response PDU 0x%08x\n", *header_digest);
3359 }
3360
3361 cmd->iov_misc_count = 1;
3362 cmd->tx_size = tx_size;
3363
e48354ce
NB		 3364 return 0;
3365}
3366
2f9bc894
NB		 3367static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3368{
3369 bool ret = false;
3370
3371 if (np->np_sockaddr.ss_family == AF_INET6) {
3372 const struct sockaddr_in6 sin6 = {
3373 .sin6_addr = IN6ADDR_ANY_INIT };
3374 struct sockaddr_in6 *sock_in6 =
3375 (struct sockaddr_in6 *)&np->np_sockaddr;
3376
3377 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3378 sin6.sin6_addr.s6_addr, 16))
3379 ret = true;
3380 } else {
3381 struct sockaddr_in * sock_in =
3382 (struct sockaddr_in *)&np->np_sockaddr;
3383
cea0b4ce 3384 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3385 ret = true;
3386 }
3387
3388 return ret;
3389}
3390
8b1e1244
AG		 3391#define SENDTARGETS_BUF_LIMIT 32768U
3392
22c7aaa5
SG		 3393static int
3394iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3395 enum iscsit_transport_type network_transport)
e48354ce
NB		 3396{
3397 char *payload = NULL;
3398 struct iscsi_conn *conn = cmd->conn;
3399 struct iscsi_portal_group *tpg;
3400 struct iscsi_tiqn *tiqn;
3401 struct iscsi_tpg_np *tpg_np;
3402 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3403 int target_name_printed;
8b1e1244 3404 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3405 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
e48354ce 3406
8b1e1244
AG		 3407 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3408 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3409
3410 payload = kzalloc(buffer_len, GFP_KERNEL);
3411 if (!payload) {
3412 pr_err("Unable to allocate memory for sendtargets"
3413 " response.\n");
3414 return -ENOMEM;
3415 }
6665889c
NB		 3416 /*
3417 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3418 * explicit case..
3419 */
3420 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3421 text_ptr = strchr(text_in, '=');
3422 if (!text_ptr) {
3423 pr_err("Unable to locate '=' string in text_in:"
3424 " %s\n", text_in);
4f45d320 3425 kfree(payload);
6665889c
NB		 3426 return -EINVAL;
3427 }
3428 /*
3429 * Skip over '=' character..
3430 */
3431 text_ptr += 1;
3432 }
e48354ce
NB		 3433
3434 spin_lock(&tiqn_lock);
3435 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
6665889c
NB		 3436 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3437 strcmp(tiqn->tiqn, text_ptr)) {
3438 continue;
3439 }
3440
2dd1d53f 3441 target_name_printed = 0;
e48354ce
NB		 3442
3443 spin_lock(&tiqn->tiqn_tpg_lock);
3444 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
2dd1d53f
TG		 3446 /* If demo_mode_discovery=0 and generate_node_acls=0
3447 * (demo mode dislabed) do not return
3448 * TargetName+TargetAddress unless a NodeACL exists.
3449 */
3450
3451 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454 cmd->conn->sess->sess_ops->InitiatorName))) {
3455 continue;
3456 }
3457
e48354ce
NB		 3458 spin_lock(&tpg->tpg_state_lock);
3459 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461 spin_unlock(&tpg->tpg_state_lock);
3462 continue;
3463 }
3464 spin_unlock(&tpg->tpg_state_lock);
3465
3466 spin_lock(&tpg->tpg_np_lock);
3467 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468 tpg_np_list) {
2f9bc894
NB		 3469 struct iscsi_np *np = tpg_np->tpg_np;
3470 bool inaddr_any = iscsit_check_inaddr_any(np);
3471
22c7aaa5
SG		 3472 if (np->np_network_transport != network_transport)
3473 continue;
3474
2dd1d53f
TG		 3475 if (!target_name_printed) {
3476 len = sprintf(buf, "TargetName=%s",
3477 tiqn->tiqn);
3478 len += 1;
3479
3480 if ((len + payload_len) > buffer_len) {
3481 spin_unlock(&tpg->tpg_np_lock);
3482 spin_unlock(&tiqn->tiqn_tpg_lock);
3483 end_of_buf = 1;
3484 goto eob;
3485 }
3486 memcpy(payload + payload_len, buf, len);
3487 payload_len += len;
3488 target_name_printed = 1;
3489 }
3490
e48354ce 3491 len = sprintf(buf, "TargetAddress="
dfecf611 3492 "%s:%hu,%hu",
0bcc297e
CVB		 3493 inaddr_any ? conn->local_ip : np->np_ip,
3494 inaddr_any ? conn->local_port : np->np_port,
e48354ce
NB		 3495 tpg->tpgt);
3496 len += 1;
3497
3498 if ((len + payload_len) > buffer_len) {
3499 spin_unlock(&tpg->tpg_np_lock);
3500 spin_unlock(&tiqn->tiqn_tpg_lock);
3501 end_of_buf = 1;
3502 goto eob;
3503 }
8359cf43 3504 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3505 payload_len += len;
3506 }
3507 spin_unlock(&tpg->tpg_np_lock);
3508 }
3509 spin_unlock(&tiqn->tiqn_tpg_lock);
3510eob:
3511 if (end_of_buf)
3512 break;
6665889c
NB		 3513
3514 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3515 break;
e48354ce
NB		 3516 }
3517 spin_unlock(&tiqn_lock);
3518
3519 cmd->buf_ptr = payload;
3520
3521 return payload_len;
3522}
3523
889c8a68
NB		 3524int
3525iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
22c7aaa5
SG		 3526 struct iscsi_text_rsp *hdr,
3527 enum iscsit_transport_type network_transport)
e48354ce 3528{
889c8a68 3529 int text_length, padding;
e48354ce 3530
22c7aaa5 3531 text_length = iscsit_build_sendtargets_response(cmd, network_transport);
e48354ce
NB		 3532 if (text_length < 0)
3533 return text_length;
3534
889c8a68
NB		 3535 hdr->opcode = ISCSI_OP_TEXT_RSP;
3536 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
e48354ce 3537 padding = ((-text_length) & 3);
e48354ce 3538 hton24(hdr->dlength, text_length);
889c8a68
NB		 3539 hdr->itt = cmd->init_task_tag;
3540 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3541 cmd->stat_sn = conn->stat_sn++;
3542 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3543
3544 iscsit_increment_maxcmdsn(cmd, conn->sess);
889c8a68
NB		 3545 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3546 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
e48354ce 3547
889c8a68
NB		 3548 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3549 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3550 text_length, conn->cid);
3551
3552 return text_length + padding;
3553}
3554EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3555
889c8a68
NB		 3556/*
3557 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3558 * MaxRecvDataSegmentLength.
3559 */
3560static int iscsit_send_text_rsp(
3561 struct iscsi_cmd *cmd,
3562 struct iscsi_conn *conn)
3563{
3564 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3565 struct kvec *iov;
3566 u32 tx_size = 0;
3567 int text_length, iov_count = 0, rc;
3568
22c7aaa5 3569 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
889c8a68
NB		 3570 if (rc < 0)
3571 return rc;
3572
3573 text_length = rc;
3574 iov = &cmd->iov_misc[0];
e48354ce
NB		 3575 iov[iov_count].iov_base = cmd->pdu;
3576 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3577 iov[iov_count].iov_base = cmd->buf_ptr;
889c8a68 3578 iov[iov_count++].iov_len = text_length;
e48354ce 3579
889c8a68 3580 tx_size += (ISCSI_HDR_LEN + text_length);
e48354ce
NB		 3581
3582 if (conn->conn_ops->HeaderDigest) {
3583 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3584
80690fdb
GU		 3585 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3586 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3587
3588 iov[0].iov_len += ISCSI_CRC_LEN;
3589 tx_size += ISCSI_CRC_LEN;
3590 pr_debug("Attaching CRC32 HeaderDigest for"
3591 " Text Response PDU 0x%08x\n", *header_digest);
3592 }
3593
3594 if (conn->conn_ops->DataDigest) {
3595 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
889c8a68 3596 cmd->buf_ptr, text_length,
e48354ce
NB		 3597 0, NULL, (u8 *)&cmd->data_crc);
3598
3599 iov[iov_count].iov_base = &cmd->data_crc;
3600 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3601 tx_size += ISCSI_CRC_LEN;
3602
3603 pr_debug("Attaching DataDigest for %u bytes of text"
889c8a68 3604 " data, CRC 0x%08x\n", text_length,
e48354ce
NB		 3605 cmd->data_crc);
3606 }
3607
3608 cmd->iov_misc_count = iov_count;
3609 cmd->tx_size = tx_size;
3610
e48354ce
NB		 3611 return 0;
3612}
3613
2ec5a8c1
NB		 3614void
3615iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3616 struct iscsi_reject *hdr)
3617{
3618 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3619 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3620 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3621 hton24(hdr->dlength, ISCSI_HDR_LEN);
3622 hdr->ffffffff = cpu_to_be32(0xffffffff);
3623 cmd->stat_sn = conn->stat_sn++;
3624 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3625 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3626 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3627
3628}
3629EXPORT_SYMBOL(iscsit_build_reject);
3630
e48354ce
NB		 3631static int iscsit_send_reject(
3632 struct iscsi_cmd *cmd,
3633 struct iscsi_conn *conn)
3634{
bfbdb31d 3635 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3636 struct kvec *iov;
bfbdb31d 3637 u32 iov_count = 0, tx_size;
e48354ce 3638
bfbdb31d 3639 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3640
3641 iov = &cmd->iov_misc[0];
e48354ce
NB		 3642 iov[iov_count].iov_base = cmd->pdu;
3643 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3644 iov[iov_count].iov_base = cmd->buf_ptr;
3645 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3646
3647 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3648
3649 if (conn->conn_ops->HeaderDigest) {
3650 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3651
80690fdb
GU		 3652 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3653 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3654
3655 iov[0].iov_len += ISCSI_CRC_LEN;
3656 tx_size += ISCSI_CRC_LEN;
3657 pr_debug("Attaching CRC32 HeaderDigest for"
3658 " REJECT PDU 0x%08x\n", *header_digest);
3659 }
3660
3661 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3662 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3663 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3664
3665 iov[iov_count].iov_base = &cmd->data_crc;
3666 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3667 tx_size += ISCSI_CRC_LEN;
3668 pr_debug("Attaching CRC32 DataDigest for REJECT"
3669 " PDU 0x%08x\n", cmd->data_crc);
3670 }
3671
3672 cmd->iov_misc_count = iov_count;
3673 cmd->tx_size = tx_size;
3674
3675 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3676 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3677
3678 return 0;
3679}
3680
e48354ce
NB		 3681void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3682{
3683 struct iscsi_thread_set *ts = conn->thread_set;
3684 int ord, cpu;
3685 /*
3686 * thread_id is assigned from iscsit_global->ts_bitmap from
3687 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3688 *
3689 * Here we use thread_id to determine which CPU that this
3690 * iSCSI connection's iscsi_thread_set will be scheduled to
3691 * execute upon.
3692 */
3693 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3694 for_each_online_cpu(cpu) {
3695 if (ord-- == 0) {
3696 cpumask_set_cpu(cpu, conn->conn_cpumask);
3697 return;
3698 }
3699 }
3700 /*
3701 * This should never be reached..
3702 */
3703 dump_stack();
3704 cpumask_setall(conn->conn_cpumask);
3705}
3706
3707static inline void iscsit_thread_check_cpumask(
3708 struct iscsi_conn *conn,
3709 struct task_struct *p,
3710 int mode)
3711{
3712 char buf[128];
3713 /*
3714 * mode == 1 signals iscsi_target_tx_thread() usage.
3715 * mode == 0 signals iscsi_target_rx_thread() usage.
3716 */
3717 if (mode == 1) {
3718 if (!conn->conn_tx_reset_cpumask)
3719 return;
3720 conn->conn_tx_reset_cpumask = 0;
3721 } else {
3722 if (!conn->conn_rx_reset_cpumask)
3723 return;
3724 conn->conn_rx_reset_cpumask = 0;
3725 }
3726 /*
3727 * Update the CPU mask for this single kthread so that
3728 * both TX and RX kthreads are scheduled to run on the
3729 * same CPU.
3730 */
3731 memset(buf, 0, 128);
3732 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3733 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3734}
3735
2ec5a8c1
NB		 3736static int
3737iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3738{
6f3c0e69
AG		 3739 int ret;
3740
2ec5a8c1
NB		 3741 switch (state) {
3742 case ISTATE_SEND_R2T:
3743 ret = iscsit_send_r2t(cmd, conn);
3744 if (ret < 0)
3745 goto err;
3746 break;
3747 case ISTATE_REMOVE:
3748 spin_lock_bh(&conn->cmd_lock);
5159d763 3749 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3750 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3751
aafc9d15 3752 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3753 break;
3754 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3755 iscsit_mod_nopin_response_timer(conn);
3756 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3757 if (ret < 0)
6f3c0e69 3758 goto err;
2ec5a8c1
NB		 3759 break;
3760 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3761 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3762 if (ret < 0)
3763 goto err;
3764 break;
3765 default:
3766 pr_err("Unknown Opcode: 0x%02x ITT:"
3767 " 0x%08x, i_state: %d on CID: %hu\n",
3768 cmd->iscsi_opcode, cmd->init_task_tag, state,
3769 conn->cid);
3770 goto err;
6f3c0e69
AG		 3771 }
3772
3773 return 0;
3774
3775err:
3776 return -1;
3777}
3778
2ec5a8c1
NB		 3779static int
3780iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3781{
2ec5a8c1 3782 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3783 struct iscsi_queue_req *qr;
3784 struct iscsi_cmd *cmd;
3785 u8 state;
3786 int ret;
3787
2ec5a8c1
NB		 3788 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3789 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3790 cmd = qr->cmd;
3791 state = qr->state;
3792 kmem_cache_free(lio_qr_cache, qr);
3793
2ec5a8c1
NB		 3794 ret = t->iscsit_immediate_queue(conn, cmd, state);
3795 if (ret < 0)
3796 return ret;
3797 }
fd3a9025 3798
2ec5a8c1
NB		 3799 return 0;
3800}
6f3c0e69 3801
2ec5a8c1
NB		 3802static int
3803iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3804{
3805 int ret;
3806
3807check_rsp_state:
3808 switch (state) {
3809 case ISTATE_SEND_DATAIN:
3810 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3811 if (ret < 0)
3812 goto err;
2ec5a8c1
NB		 3813 else if (!ret)
3814 /* more drs */
3815 goto check_rsp_state;
3816 else if (ret == 1) {
3817 /* all done */
3818 spin_lock_bh(&cmd->istate_lock);
3819 cmd->i_state = ISTATE_SENT_STATUS;
3820 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3821
2ec5a8c1
NB		 3822 if (atomic_read(&conn->check_immediate_queue))
3823 return 1;
6f3c0e69 3824
2ec5a8c1
NB		 3825 return 0;
3826 } else if (ret == 2) {
3827 /* Still must send status,
3828 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3829 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3830 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3831 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3832 state = ISTATE_SEND_STATUS;
3833 goto check_rsp_state;
3834 }
3835
3836 break;
3837 case ISTATE_SEND_STATUS:
3838 case ISTATE_SEND_STATUS_RECOVERY:
3839 ret = iscsit_send_response(cmd, conn);
3840 break;
3841 case ISTATE_SEND_LOGOUTRSP:
3842 ret = iscsit_send_logout(cmd, conn);
3843 break;
3844 case ISTATE_SEND_ASYNCMSG:
3845 ret = iscsit_send_conn_drop_async_message(
3846 cmd, conn);
3847 break;
3848 case ISTATE_SEND_NOPIN:
3849 ret = iscsit_send_nopin(cmd, conn);
3850 break;
3851 case ISTATE_SEND_REJECT:
3852 ret = iscsit_send_reject(cmd, conn);
3853 break;
3854 case ISTATE_SEND_TASKMGTRSP:
3855 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3856 if (ret != 0)
6f3c0e69 3857 break;
2ec5a8c1
NB		 3858 ret = iscsit_tmr_post_handler(cmd, conn);
3859 if (ret != 0)
3860 iscsit_fall_back_to_erl0(conn->sess);
3861 break;
3862 case ISTATE_SEND_TEXTRSP:
3863 ret = iscsit_send_text_rsp(cmd, conn);
3864 break;
3865 default:
3866 pr_err("Unknown Opcode: 0x%02x ITT:"
3867 " 0x%08x, i_state: %d on CID: %hu\n",
3868 cmd->iscsi_opcode, cmd->init_task_tag,
3869 state, conn->cid);
3870 goto err;
3871 }
3872 if (ret < 0)
3873 goto err;
3874
3875 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3876 iscsit_tx_thread_wait_for_tcp(conn);
3877 iscsit_unmap_iovec(cmd);
3878 goto err;
3879 }
3880 iscsit_unmap_iovec(cmd);
3881
3882 switch (state) {
3883 case ISTATE_SEND_LOGOUTRSP:
3884 if (!iscsit_logout_post_handler(cmd, conn))
3885 goto restart;
3886 /* fall through */
3887 case ISTATE_SEND_STATUS:
3888 case ISTATE_SEND_ASYNCMSG:
3889 case ISTATE_SEND_NOPIN:
3890 case ISTATE_SEND_STATUS_RECOVERY:
3891 case ISTATE_SEND_TEXTRSP:
3892 case ISTATE_SEND_TASKMGTRSP:
ba159914 3893 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3894 spin_lock_bh(&cmd->istate_lock);
3895 cmd->i_state = ISTATE_SENT_STATUS;
3896 spin_unlock_bh(&cmd->istate_lock);
3897 break;
2ec5a8c1
NB		 3898 default:
3899 pr_err("Unknown Opcode: 0x%02x ITT:"
3900 " 0x%08x, i_state: %d on CID: %hu\n",
3901 cmd->iscsi_opcode, cmd->init_task_tag,
3902 cmd->i_state, conn->cid);
3903 goto err;
6f3c0e69
AG		 3904 }
3905
2ec5a8c1
NB		 3906 if (atomic_read(&conn->check_immediate_queue))
3907 return 1;
3908
6f3c0e69
AG		 3909 return 0;
3910
3911err:
3912 return -1;
3913restart:
3914 return -EAGAIN;
3915}
3916
2ec5a8c1
NB		 3917static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3918{
3919 struct iscsit_transport *t = conn->conn_transport;
3920 struct iscsi_queue_req *qr;
3921 struct iscsi_cmd *cmd;
3922 u8 state;
3923 int ret;
3924
3925 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3926 cmd = qr->cmd;
3927 state = qr->state;
3928 kmem_cache_free(lio_qr_cache, qr);
3929
3930 ret = t->iscsit_response_queue(conn, cmd, state);
3931 if (ret == 1 || ret < 0)
3932 return ret;
3933 }
3934
3935 return 0;
3936}
3937
6f3c0e69
AG		 3938int iscsi_target_tx_thread(void *arg)
3939{
e48354ce 3940 int ret = 0;
e48354ce 3941 struct iscsi_conn *conn;
8359cf43 3942 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3943 /*
3944 * Allow ourselves to be interrupted by SIGINT so that a
3945 * connection recovery / failure event can be triggered externally.
3946 */
3947 allow_signal(SIGINT);
3948
3949restart:
3950 conn = iscsi_tx_thread_pre_handler(ts);
3951 if (!conn)
3952 goto out;
3953
6f3c0e69 3954 ret = 0;
e48354ce
NB		 3955
3956 while (!kthread_should_stop()) {
3957 /*
3958 * Ensure that both TX and RX per connection kthreads
3959 * are scheduled to run on the same CPU.
3960 */
3961 iscsit_thread_check_cpumask(conn, current, 1);
3962
d5627acb
RD		 3963 wait_event_interruptible(conn->queues_wq,
3964 !iscsit_conn_all_queues_empty(conn) ||
3965 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3966
3967 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3968 signal_pending(current))
3969 goto transport_err;
3970
fd3a9025 3971get_immediate:
2ec5a8c1 3972 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3973 if (ret < 0)
3974 goto transport_err;
e48354ce 3975
2ec5a8c1 3976 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3977 if (ret == 1)
3978 goto get_immediate;
3979 else if (ret == -EAGAIN)
6f3c0e69
AG		 3980 goto restart;
3981 else if (ret < 0)
3982 goto transport_err;
e48354ce
NB		 3983 }
3984
3985transport_err:
3986 iscsit_take_action_for_connection_exit(conn);
3987 goto restart;
3988out:
3989 return 0;
3990}
3991
3e1c81a9
NB		 3992static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3993{
3994 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3995 struct iscsi_cmd *cmd;
3996 int ret = 0;
3997
3998 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3999 case ISCSI_OP_SCSI_CMD:
676687c6 4000 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4001 if (!cmd)
ba159914 4002 goto reject;
3e1c81a9
NB		 4003
4004 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4005 break;
4006 case ISCSI_OP_SCSI_DATA_OUT:
4007 ret = iscsit_handle_data_out(conn, buf);
4008 break;
4009 case ISCSI_OP_NOOP_OUT:
4010 cmd = NULL;
4011 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
676687c6 4012 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4013 if (!cmd)
ba159914 4014 goto reject;
3e1c81a9
NB		 4015 }
4016 ret = iscsit_handle_nop_out(conn, cmd, buf);
4017 break;
4018 case ISCSI_OP_SCSI_TMFUNC:
676687c6 4019 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4020 if (!cmd)
ba159914 4021 goto reject;
3e1c81a9
NB		 4022
4023 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4024 break;
4025 case ISCSI_OP_TEXT:
676687c6 4026 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
64534aa7 4027 if (!cmd)
ba159914 4028 goto reject;
64534aa7
NB		 4029
4030 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 4031 break;
4032 case ISCSI_OP_LOGOUT:
676687c6 4033 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4034 if (!cmd)
ba159914 4035 goto reject;
3e1c81a9
NB		 4036
4037 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4038 if (ret > 0)
4039 wait_for_completion_timeout(&conn->conn_logout_comp,
4040 SECONDS_FOR_LOGOUT_COMP * HZ);
4041 break;
4042 case ISCSI_OP_SNACK:
4043 ret = iscsit_handle_snack(conn, buf);
4044 break;
4045 default:
4046 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4047 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4048 pr_err("Cannot recover from unknown"
4049 " opcode while ERL=0, closing iSCSI connection.\n");
4050 return -1;
4051 }
4052 if (!conn->conn_ops->OFMarker) {
4053 pr_err("Unable to recover from unknown"
4054 " opcode while OFMarker=No, closing iSCSI"
4055 " connection.\n");
4056 return -1;
4057 }
4058 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4059 pr_err("Unable to recover from unknown"
4060 " opcode, closing iSCSI connection.\n");
4061 return -1;
4062 }
4063 break;
4064 }
4065
4066 return ret;
ba159914
NB		 4067reject:
4068 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 4069}
4070
e48354ce
NB		 4071int iscsi_target_rx_thread(void *arg)
4072{
4073 int ret;
4074 u8 buffer[ISCSI_HDR_LEN], opcode;
4075 u32 checksum = 0, digest = 0;
4076 struct iscsi_conn *conn = NULL;
8359cf43 4077 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 4078 struct kvec iov;
4079 /*
4080 * Allow ourselves to be interrupted by SIGINT so that a
4081 * connection recovery / failure event can be triggered externally.
4082 */
4083 allow_signal(SIGINT);
4084
4085restart:
4086 conn = iscsi_rx_thread_pre_handler(ts);
4087 if (!conn)
4088 goto out;
4089
3e1c81a9
NB		 4090 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4091 struct completion comp;
4092 int rc;
4093
4094 init_completion(&comp);
4095 rc = wait_for_completion_interruptible(&comp);
4096 if (rc < 0)
4097 goto transport_err;
4098
4099 goto out;
4100 }
4101
e48354ce
NB		 4102 while (!kthread_should_stop()) {
4103 /*
4104 * Ensure that both TX and RX per connection kthreads
4105 * are scheduled to run on the same CPU.
4106 */
4107 iscsit_thread_check_cpumask(conn, current, 0);
4108
4109 memset(buffer, 0, ISCSI_HDR_LEN);
4110 memset(&iov, 0, sizeof(struct kvec));
4111
4112 iov.iov_base = buffer;
4113 iov.iov_len = ISCSI_HDR_LEN;
4114
4115 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4116 if (ret != ISCSI_HDR_LEN) {
4117 iscsit_rx_thread_wait_for_tcp(conn);
4118 goto transport_err;
4119 }
4120
e48354ce
NB		 4121 if (conn->conn_ops->HeaderDigest) {
4122 iov.iov_base = &digest;
4123 iov.iov_len = ISCSI_CRC_LEN;
4124
4125 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4126 if (ret != ISCSI_CRC_LEN) {
4127 iscsit_rx_thread_wait_for_tcp(conn);
4128 goto transport_err;
4129 }
4130
4131 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4132 buffer, ISCSI_HDR_LEN,
4133 0, NULL, (u8 *)&checksum);
4134
4135 if (digest != checksum) {
4136 pr_err("HeaderDigest CRC32C failed,"
4137 " received 0x%08x, computed 0x%08x\n",
4138 digest, checksum);
4139 /*
4140 * Set the PDU to 0xff so it will intentionally
4141 * hit default in the switch below.
4142 */
4143 memset(buffer, 0xff, ISCSI_HDR_LEN);
04f3b31b 4144 atomic_long_inc(&conn->sess->conn_digest_errors);
e48354ce
NB		 4145 } else {
4146 pr_debug("Got HeaderDigest CRC32C"
4147 " 0x%08x\n", checksum);
4148 }
4149 }
4150
4151 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4152 goto transport_err;
4153
4154 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4155
4156 if (conn->sess->sess_ops->SessionType &&
4157 ((!(opcode & ISCSI_OP_TEXT)) ||
4158 (!(opcode & ISCSI_OP_LOGOUT)))) {
4159 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4160 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4161 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4162 buffer);
e48354ce
NB		 4163 goto transport_err;
4164 }
4165
3e1c81a9
NB		 4166 ret = iscsi_target_rx_opcode(conn, buffer);
4167 if (ret < 0)
4168 goto transport_err;
e48354ce
NB		 4169 }
4170
4171transport_err:
4172 if (!signal_pending(current))
4173 atomic_set(&conn->transport_failed, 1);
4174 iscsit_take_action_for_connection_exit(conn);
4175 goto restart;
4176out:
4177 return 0;
4178}
4179
4180static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4181{
4182 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4183 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4184 /*
4185 * We expect this function to only ever be called from either RX or TX
4186 * thread context via iscsit_close_connection() once the other context
4187 * has been reset -> returned sleeping pre-handler state.
4188 */
4189 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4190 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4191
5159d763 4192 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4193 spin_unlock_bh(&conn->cmd_lock);
4194
4195 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4196
aafc9d15 4197 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4198
4199 spin_lock_bh(&conn->cmd_lock);
4200 }
4201 spin_unlock_bh(&conn->cmd_lock);
4202}
4203
4204static void iscsit_stop_timers_for_cmds(
4205 struct iscsi_conn *conn)
4206{
4207 struct iscsi_cmd *cmd;
4208
4209 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4210 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4211 if (cmd->data_direction == DMA_TO_DEVICE)
4212 iscsit_stop_dataout_timer(cmd);
4213 }
4214 spin_unlock_bh(&conn->cmd_lock);
4215}
4216
4217int iscsit_close_connection(
4218 struct iscsi_conn *conn)
4219{
4220 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4221 struct iscsi_session *sess = conn->sess;
4222
4223 pr_debug("Closing iSCSI connection CID %hu on SID:"
4224 " %u\n", conn->cid, sess->sid);
4225 /*
4226 * Always up conn_logout_comp just in case the RX Thread is sleeping
4227 * and the logout response never got sent because the connection
4228 * failed.
4229 */
4230 complete(&conn->conn_logout_comp);
4231
4232 iscsi_release_thread_set(conn);
4233
4234 iscsit_stop_timers_for_cmds(conn);
4235 iscsit_stop_nopin_response_timer(conn);
4236 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4237
4238 if (conn->conn_transport->iscsit_wait_conn)
4239 conn->conn_transport->iscsit_wait_conn(conn);
4240
e48354ce
NB		 4241 /*
4242 * During Connection recovery drop unacknowledged out of order
4243 * commands for this connection, and prepare the other commands
4244 * for realligence.
4245 *
4246 * During normal operation clear the out of order commands (but
4247 * do not free the struct iscsi_ooo_cmdsn's) and release all
4248 * struct iscsi_cmds.
4249 */
4250 if (atomic_read(&conn->connection_recovery)) {
4251 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4252 iscsit_prepare_cmds_for_realligance(conn);
4253 } else {
4254 iscsit_clear_ooo_cmdsns_for_conn(conn);
4255 iscsit_release_commands_from_conn(conn);
4256 }
bbc05048 4257 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4258
4259 /*
4260 * Handle decrementing session or connection usage count if
4261 * a logout response was not able to be sent because the
4262 * connection failed. Fall back to Session Recovery here.
4263 */
4264 if (atomic_read(&conn->conn_logout_remove)) {
4265 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4266 iscsit_dec_conn_usage_count(conn);
4267 iscsit_dec_session_usage_count(sess);
4268 }
4269 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4270 iscsit_dec_conn_usage_count(conn);
4271
4272 atomic_set(&conn->conn_logout_remove, 0);
4273 atomic_set(&sess->session_reinstatement, 0);
4274 atomic_set(&sess->session_fall_back_to_erl0, 1);
4275 }
4276
4277 spin_lock_bh(&sess->conn_lock);
4278 list_del(&conn->conn_list);
4279
4280 /*
4281 * Attempt to let the Initiator know this connection failed by
4282 * sending an Connection Dropped Async Message on another
4283 * active connection.
4284 */
4285 if (atomic_read(&conn->connection_recovery))
4286 iscsit_build_conn_drop_async_message(conn);
4287
4288 spin_unlock_bh(&sess->conn_lock);
4289
4290 /*
4291 * If connection reinstatement is being performed on this connection,
4292 * up the connection reinstatement semaphore that is being blocked on
4293 * in iscsit_cause_connection_reinstatement().
4294 */
4295 spin_lock_bh(&conn->state_lock);
4296 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4297 spin_unlock_bh(&conn->state_lock);
4298 complete(&conn->conn_wait_comp);
4299 wait_for_completion(&conn->conn_post_wait_comp);
4300 spin_lock_bh(&conn->state_lock);
4301 }
4302
4303 /*
4304 * If connection reinstatement is being performed on this connection
4305 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4306 * connection wait rcfr semaphore that is being blocked on
4307 * an iscsit_connection_reinstatement_rcfr().
4308 */
4309 if (atomic_read(&conn->connection_wait_rcfr)) {
4310 spin_unlock_bh(&conn->state_lock);
4311 complete(&conn->conn_wait_rcfr_comp);
4312 wait_for_completion(&conn->conn_post_wait_comp);
4313 spin_lock_bh(&conn->state_lock);
4314 }
4315 atomic_set(&conn->connection_reinstatement, 1);
4316 spin_unlock_bh(&conn->state_lock);
4317
4318 /*
4319 * If any other processes are accessing this connection pointer we
4320 * must wait until they have completed.
4321 */
4322 iscsit_check_conn_usage_count(conn);
4323
4324 if (conn->conn_rx_hash.tfm)
4325 crypto_free_hash(conn->conn_rx_hash.tfm);
4326 if (conn->conn_tx_hash.tfm)
4327 crypto_free_hash(conn->conn_tx_hash.tfm);
4328
4329 if (conn->conn_cpumask)
4330 free_cpumask_var(conn->conn_cpumask);
4331
4332 kfree(conn->conn_ops);
4333 conn->conn_ops = NULL;
4334
bf6932f4 4335 if (conn->sock)
e48354ce 4336 sock_release(conn->sock);
baa4d64b
NB		 4337
4338 if (conn->conn_transport->iscsit_free_conn)
4339 conn->conn_transport->iscsit_free_conn(conn);
4340
4341 iscsit_put_transport(conn->conn_transport);
4342
e48354ce
NB		 4343 conn->thread_set = NULL;
4344
4345 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4346 conn->conn_state = TARG_CONN_STATE_FREE;
4347 kfree(conn);
4348
4349 spin_lock_bh(&sess->conn_lock);
4350 atomic_dec(&sess->nconn);
4351 pr_debug("Decremented iSCSI connection count to %hu from node:"
4352 " %s\n", atomic_read(&sess->nconn),
4353 sess->sess_ops->InitiatorName);
4354 /*
4355 * Make sure that if one connection fails in an non ERL=2 iSCSI
4356 * Session that they all fail.
4357 */
4358 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4359 !atomic_read(&sess->session_logout))
4360 atomic_set(&sess->session_fall_back_to_erl0, 1);
4361
4362 /*
4363 * If this was not the last connection in the session, and we are
4364 * performing session reinstatement or falling back to ERL=0, call
4365 * iscsit_stop_session() without sleeping to shutdown the other
4366 * active connections.
4367 */
4368 if (atomic_read(&sess->nconn)) {
4369 if (!atomic_read(&sess->session_reinstatement) &&
4370 !atomic_read(&sess->session_fall_back_to_erl0)) {
4371 spin_unlock_bh(&sess->conn_lock);
4372 return 0;
4373 }
4374 if (!atomic_read(&sess->session_stop_active)) {
4375 atomic_set(&sess->session_stop_active, 1);
4376 spin_unlock_bh(&sess->conn_lock);
4377 iscsit_stop_session(sess, 0, 0);
4378 return 0;
4379 }
4380 spin_unlock_bh(&sess->conn_lock);
4381 return 0;
4382 }
4383
4384 /*
4385 * If this was the last connection in the session and one of the
4386 * following is occurring:
4387 *
4388 * Session Reinstatement is not being performed, and are falling back
4389 * to ERL=0 call iscsit_close_session().
4390 *
4391 * Session Logout was requested. iscsit_close_session() will be called
4392 * elsewhere.
4393 *
4394 * Session Continuation is not being performed, start the Time2Retain
4395 * handler and check if sleep_on_sess_wait_sem is active.
4396 */
4397 if (!atomic_read(&sess->session_reinstatement) &&
4398 atomic_read(&sess->session_fall_back_to_erl0)) {
4399 spin_unlock_bh(&sess->conn_lock);
99367f01 4400 target_put_session(sess->se_sess);
e48354ce
NB		 4401
4402 return 0;
4403 } else if (atomic_read(&sess->session_logout)) {
4404 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4405 sess->session_state = TARG_SESS_STATE_FREE;
4406 spin_unlock_bh(&sess->conn_lock);
4407
4408 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4409 complete(&sess->session_wait_comp);
4410
4411 return 0;
4412 } else {
4413 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4414 sess->session_state = TARG_SESS_STATE_FAILED;
4415
4416 if (!atomic_read(&sess->session_continuation)) {
4417 spin_unlock_bh(&sess->conn_lock);
4418 iscsit_start_time2retain_handler(sess);
4419 } else
4420 spin_unlock_bh(&sess->conn_lock);
4421
4422 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4423 complete(&sess->session_wait_comp);
4424
4425 return 0;
4426 }
4427 spin_unlock_bh(&sess->conn_lock);
4428
4429 return 0;
4430}
4431
4432int iscsit_close_session(struct iscsi_session *sess)
4433{
60bfcf8e 4434 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4435 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4436
4437 if (atomic_read(&sess->nconn)) {
4438 pr_err("%d connection(s) still exist for iSCSI session"
4439 " to %s\n", atomic_read(&sess->nconn),
4440 sess->sess_ops->InitiatorName);
4441 BUG();
4442 }
4443
4444 spin_lock_bh(&se_tpg->session_lock);
4445 atomic_set(&sess->session_logout, 1);
4446 atomic_set(&sess->session_reinstatement, 1);
4447 iscsit_stop_time2retain_timer(sess);
4448 spin_unlock_bh(&se_tpg->session_lock);
4449
4450 /*
4451 * transport_deregister_session_configfs() will clear the
4452 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4453 * can be setting it again with __transport_register_session() in
4454 * iscsi_post_login_handler() again after the iscsit_stop_session()
4455 * completes in iscsi_np context.
4456 */
4457 transport_deregister_session_configfs(sess->se_sess);
4458
4459 /*
4460 * If any other processes are accessing this session pointer we must
4461 * wait until they have completed. If we are in an interrupt (the
4462 * time2retain handler) and contain and active session usage count we
4463 * restart the timer and exit.
4464 */
4465 if (!in_interrupt()) {
4466 if (iscsit_check_session_usage_count(sess) == 1)
4467 iscsit_stop_session(sess, 1, 1);
4468 } else {
4469 if (iscsit_check_session_usage_count(sess) == 2) {
4470 atomic_set(&sess->session_logout, 0);
4471 iscsit_start_time2retain_handler(sess);
4472 return 0;
4473 }
4474 }
4475
4476 transport_deregister_session(sess->se_sess);
4477
4478 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4479 iscsit_free_connection_recovery_entires(sess);
4480
4481 iscsit_free_all_ooo_cmdsns(sess);
4482
4483 spin_lock_bh(&se_tpg->session_lock);
4484 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4485 sess->session_state = TARG_SESS_STATE_FREE;
4486 pr_debug("Released iSCSI session from node: %s\n",
4487 sess->sess_ops->InitiatorName);
4488 tpg->nsessions--;
4489 if (tpg->tpg_tiqn)
4490 tpg->tpg_tiqn->tiqn_nsessions--;
4491
4492 pr_debug("Decremented number of active iSCSI Sessions on"
4493 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4494
4495 spin_lock(&sess_idr_lock);
4496 idr_remove(&sess_idr, sess->session_index);
4497 spin_unlock(&sess_idr_lock);
4498
4499 kfree(sess->sess_ops);
4500 sess->sess_ops = NULL;
4501 spin_unlock_bh(&se_tpg->session_lock);
4502
4503 kfree(sess);
4504 return 0;
4505}
4506
4507static void iscsit_logout_post_handler_closesession(
4508 struct iscsi_conn *conn)
4509{
4510 struct iscsi_session *sess = conn->sess;
4511
4512 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4513 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4514
4515 atomic_set(&conn->conn_logout_remove, 0);
4516 complete(&conn->conn_logout_comp);
4517
4518 iscsit_dec_conn_usage_count(conn);
4519 iscsit_stop_session(sess, 1, 1);
4520 iscsit_dec_session_usage_count(sess);
99367f01 4521 target_put_session(sess->se_sess);
e48354ce
NB		 4522}
4523
4524static void iscsit_logout_post_handler_samecid(
4525 struct iscsi_conn *conn)
4526{
4527 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4528 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4529
4530 atomic_set(&conn->conn_logout_remove, 0);
4531 complete(&conn->conn_logout_comp);
4532
4533 iscsit_cause_connection_reinstatement(conn, 1);
4534 iscsit_dec_conn_usage_count(conn);
4535}
4536
4537static void iscsit_logout_post_handler_diffcid(
4538 struct iscsi_conn *conn,
4539 u16 cid)
4540{
4541 struct iscsi_conn *l_conn;
4542 struct iscsi_session *sess = conn->sess;
4543
4544 if (!sess)
4545 return;
4546
4547 spin_lock_bh(&sess->conn_lock);
4548 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4549 if (l_conn->cid == cid) {
4550 iscsit_inc_conn_usage_count(l_conn);
4551 break;
4552 }
4553 }
4554 spin_unlock_bh(&sess->conn_lock);
4555
4556 if (!l_conn)
4557 return;
4558
4559 if (l_conn->sock)
4560 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4561
4562 spin_lock_bh(&l_conn->state_lock);
4563 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4564 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4565 spin_unlock_bh(&l_conn->state_lock);
4566
4567 iscsit_cause_connection_reinstatement(l_conn, 1);
4568 iscsit_dec_conn_usage_count(l_conn);
4569}
4570
4571/*
4572 * Return of 0 causes the TX thread to restart.
4573 */
2ec5a8c1 4574int iscsit_logout_post_handler(
e48354ce
NB		 4575 struct iscsi_cmd *cmd,
4576 struct iscsi_conn *conn)
4577{
4578 int ret = 0;
4579
4580 switch (cmd->logout_reason) {
4581 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4582 switch (cmd->logout_response) {
4583 case ISCSI_LOGOUT_SUCCESS:
4584 case ISCSI_LOGOUT_CLEANUP_FAILED:
4585 default:
4586 iscsit_logout_post_handler_closesession(conn);
4587 break;
4588 }
4589 ret = 0;
4590 break;
4591 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4592 if (conn->cid == cmd->logout_cid) {
4593 switch (cmd->logout_response) {
4594 case ISCSI_LOGOUT_SUCCESS:
4595 case ISCSI_LOGOUT_CLEANUP_FAILED:
4596 default:
4597 iscsit_logout_post_handler_samecid(conn);
4598 break;
4599 }
4600 ret = 0;
4601 } else {
4602 switch (cmd->logout_response) {
4603 case ISCSI_LOGOUT_SUCCESS:
4604 iscsit_logout_post_handler_diffcid(conn,
4605 cmd->logout_cid);
4606 break;
4607 case ISCSI_LOGOUT_CID_NOT_FOUND:
4608 case ISCSI_LOGOUT_CLEANUP_FAILED:
4609 default:
4610 break;
4611 }
4612 ret = 1;
4613 }
4614 break;
4615 case ISCSI_LOGOUT_REASON_RECOVERY:
4616 switch (cmd->logout_response) {
4617 case ISCSI_LOGOUT_SUCCESS:
4618 case ISCSI_LOGOUT_CID_NOT_FOUND:
4619 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4620 case ISCSI_LOGOUT_CLEANUP_FAILED:
4621 default:
4622 break;
4623 }
4624 ret = 1;
4625 break;
4626 default:
4627 break;
4628
4629 }
4630 return ret;
4631}
2ec5a8c1 4632EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4633
4634void iscsit_fail_session(struct iscsi_session *sess)
4635{
4636 struct iscsi_conn *conn;
4637
4638 spin_lock_bh(&sess->conn_lock);
4639 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4640 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4641 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4642 }
4643 spin_unlock_bh(&sess->conn_lock);
4644
4645 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4646 sess->session_state = TARG_SESS_STATE_FAILED;
4647}
4648
4649int iscsit_free_session(struct iscsi_session *sess)
4650{
4651 u16 conn_count = atomic_read(&sess->nconn);
4652 struct iscsi_conn *conn, *conn_tmp = NULL;
4653 int is_last;
4654
4655 spin_lock_bh(&sess->conn_lock);
4656 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4657
4658 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4659 conn_list) {
4660 if (conn_count == 0)
4661 break;
4662
4663 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4664 is_last = 1;
4665 } else {
4666 iscsit_inc_conn_usage_count(conn_tmp);
4667 is_last = 0;
4668 }
4669 iscsit_inc_conn_usage_count(conn);
4670
4671 spin_unlock_bh(&sess->conn_lock);
4672 iscsit_cause_connection_reinstatement(conn, 1);
4673 spin_lock_bh(&sess->conn_lock);
4674
4675 iscsit_dec_conn_usage_count(conn);
4676 if (is_last == 0)
4677 iscsit_dec_conn_usage_count(conn_tmp);
4678
4679 conn_count--;
4680 }
4681
4682 if (atomic_read(&sess->nconn)) {
4683 spin_unlock_bh(&sess->conn_lock);
4684 wait_for_completion(&sess->session_wait_comp);
4685 } else
4686 spin_unlock_bh(&sess->conn_lock);
4687
99367f01 4688 target_put_session(sess->se_sess);
e48354ce
NB		 4689 return 0;
4690}
4691
4692void iscsit_stop_session(
4693 struct iscsi_session *sess,
4694 int session_sleep,
4695 int connection_sleep)
4696{
4697 u16 conn_count = atomic_read(&sess->nconn);
4698 struct iscsi_conn *conn, *conn_tmp = NULL;
4699 int is_last;
4700
4701 spin_lock_bh(&sess->conn_lock);
4702 if (session_sleep)
4703 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4704
4705 if (connection_sleep) {
4706 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4707 conn_list) {
4708 if (conn_count == 0)
4709 break;
4710
4711 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4712 is_last = 1;
4713 } else {
4714 iscsit_inc_conn_usage_count(conn_tmp);
4715 is_last = 0;
4716 }
4717 iscsit_inc_conn_usage_count(conn);
4718
4719 spin_unlock_bh(&sess->conn_lock);
4720 iscsit_cause_connection_reinstatement(conn, 1);
4721 spin_lock_bh(&sess->conn_lock);
4722
4723 iscsit_dec_conn_usage_count(conn);
4724 if (is_last == 0)
4725 iscsit_dec_conn_usage_count(conn_tmp);
4726 conn_count--;
4727 }
4728 } else {
4729 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4730 iscsit_cause_connection_reinstatement(conn, 0);
4731 }
4732
4733 if (session_sleep && atomic_read(&sess->nconn)) {
4734 spin_unlock_bh(&sess->conn_lock);
4735 wait_for_completion(&sess->session_wait_comp);
4736 } else
4737 spin_unlock_bh(&sess->conn_lock);
4738}
4739
4740int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4741{
4742 struct iscsi_session *sess;
4743 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4744 struct se_session *se_sess, *se_sess_tmp;
4745 int session_count = 0;
4746
4747 spin_lock_bh(&se_tpg->session_lock);
4748 if (tpg->nsessions && !force) {
4749 spin_unlock_bh(&se_tpg->session_lock);
4750 return -1;
4751 }
4752
4753 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4754 sess_list) {
4755 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4756
4757 spin_lock(&sess->conn_lock);
4758 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4759 atomic_read(&sess->session_logout) ||
4760 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4761 spin_unlock(&sess->conn_lock);
4762 continue;
4763 }
4764 atomic_set(&sess->session_reinstatement, 1);
4765 spin_unlock(&sess->conn_lock);
4766 spin_unlock_bh(&se_tpg->session_lock);
4767
4768 iscsit_free_session(sess);
4769 spin_lock_bh(&se_tpg->session_lock);
4770
4771 session_count++;
4772 }
4773 spin_unlock_bh(&se_tpg->session_lock);
4774
4775 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4776 " Group: %hu\n", session_count, tpg->tpgt);
4777 return 0;
4778}
4779
4780MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4781MODULE_VERSION("4.1.x");
4782MODULE_AUTHOR("nab@Linux-iSCSI.org");
4783MODULE_LICENSE("GPL");
4784
4785module_init(iscsi_target_init_module);
4786module_exit(iscsi_target_cleanup_module);
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