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target: Add TFO->abort_task for aborted task resources release
[GitHub/exynos8895/android_kernel_samsung_universal8895.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
303 if ((ip_match == true) && (np->np_port == port) &&
304 (np->np_network_transport == network_transport))
305 return true;
306
307 return false;
308}
309
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
NB		 327 match = iscsit_check_np_match(sockaddr, np, network_transport);
328 if (match == true) {
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) {
463 spin_unlock_bh(&np->np_thread_lock);
464 return 0;
465 }
466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
467 spin_unlock_bh(&np->np_thread_lock);
468
469 if (np->np_thread) {
470 /*
471 * We need to send the signal to wakeup Linux/Net
472 * which may be sleeping in sock_accept()..
473 */
474 send_sig(SIGINT, np->np_thread, 1);
475 kthread_stop(np->np_thread);
db6077fd 476 np->np_thread = NULL;
e48354ce 477 }
baa4d64b
NB		 478
479 np->np_transport->iscsit_free_np(np);
e48354ce 480
ee291e63 481 mutex_lock(&np_lock);
e48354ce 482 list_del(&np->np_list);
ee291e63 483 mutex_unlock(&np_lock);
e48354ce
NB		 484
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 486 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 487
baa4d64b 488 iscsit_put_transport(np->np_transport);
e48354ce
NB		 489 kfree(np);
490 return 0;
491}
492
2ec5a8c1
NB		 493static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495
496static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497{
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
499 return 0;
500}
501
131e6abc
NB		 502static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
503{
504 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
505
506 spin_lock_bh(&conn->cmd_lock);
507 if (!list_empty(&cmd->i_conn_node))
508 list_del_init(&cmd->i_conn_node);
509 spin_unlock_bh(&conn->cmd_lock);
510
511 __iscsit_free_cmd(cmd, scsi_cmd, true);
512}
513
baa4d64b
NB		 514static struct iscsit_transport iscsi_target_transport = {
515 .name = "iSCSI/TCP",
516 .transport_type = ISCSI_TCP,
517 .owner = NULL,
518 .iscsit_setup_np = iscsit_setup_np,
519 .iscsit_accept_np = iscsit_accept_np,
520 .iscsit_free_np = iscsit_free_np,
521 .iscsit_get_login_rx = iscsit_get_login_rx,
522 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 523 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 524 .iscsit_immediate_queue = iscsit_immediate_queue,
525 .iscsit_response_queue = iscsit_response_queue,
526 .iscsit_queue_data_in = iscsit_queue_rsp,
527 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 528 .iscsit_aborted_task = iscsit_aborted_task,
baa4d64b
NB		 529};
530
e48354ce
NB		 531static int __init iscsi_target_init_module(void)
532{
533 int ret = 0;
534
535 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
536
537 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
538 if (!iscsit_global) {
539 pr_err("Unable to allocate memory for iscsit_global\n");
540 return -1;
541 }
542 mutex_init(&auth_id_lock);
543 spin_lock_init(&sess_idr_lock);
544 idr_init(&tiqn_idr);
545 idr_init(&sess_idr);
546
547 ret = iscsi_target_register_configfs();
548 if (ret < 0)
549 goto out;
550
551 ret = iscsi_thread_set_init();
552 if (ret < 0)
553 goto configfs_out;
554
555 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
556 TARGET_THREAD_SET_COUNT) {
557 pr_err("iscsi_allocate_thread_sets() returned"
558 " unexpected value!\n");
559 goto ts_out1;
560 }
561
e48354ce
NB		 562 lio_qr_cache = kmem_cache_create("lio_qr_cache",
563 sizeof(struct iscsi_queue_req),
564 __alignof__(struct iscsi_queue_req), 0, NULL);
565 if (!lio_qr_cache) {
566 pr_err("nable to kmem_cache_create() for"
567 " lio_qr_cache\n");
d703ce2f 568 goto ts_out2;
e48354ce
NB		 569 }
570
571 lio_dr_cache = kmem_cache_create("lio_dr_cache",
572 sizeof(struct iscsi_datain_req),
573 __alignof__(struct iscsi_datain_req), 0, NULL);
574 if (!lio_dr_cache) {
575 pr_err("Unable to kmem_cache_create() for"
576 " lio_dr_cache\n");
577 goto qr_out;
578 }
579
580 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
581 sizeof(struct iscsi_ooo_cmdsn),
582 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
583 if (!lio_ooo_cache) {
584 pr_err("Unable to kmem_cache_create() for"
585 " lio_ooo_cache\n");
586 goto dr_out;
587 }
588
589 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
590 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
591 0, NULL);
592 if (!lio_r2t_cache) {
593 pr_err("Unable to kmem_cache_create() for"
594 " lio_r2t_cache\n");
595 goto ooo_out;
596 }
597
baa4d64b
NB		 598 iscsit_register_transport(&iscsi_target_transport);
599
e48354ce
NB		 600 if (iscsit_load_discovery_tpg() < 0)
601 goto r2t_out;
602
603 return ret;
604r2t_out:
605 kmem_cache_destroy(lio_r2t_cache);
606ooo_out:
607 kmem_cache_destroy(lio_ooo_cache);
608dr_out:
609 kmem_cache_destroy(lio_dr_cache);
610qr_out:
611 kmem_cache_destroy(lio_qr_cache);
e48354ce
NB		 612ts_out2:
613 iscsi_deallocate_thread_sets();
614ts_out1:
615 iscsi_thread_set_free();
616configfs_out:
617 iscsi_target_deregister_configfs();
618out:
619 kfree(iscsit_global);
620 return -ENOMEM;
621}
622
623static void __exit iscsi_target_cleanup_module(void)
624{
625 iscsi_deallocate_thread_sets();
626 iscsi_thread_set_free();
627 iscsit_release_discovery_tpg();
baa4d64b 628 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 629 kmem_cache_destroy(lio_qr_cache);
630 kmem_cache_destroy(lio_dr_cache);
631 kmem_cache_destroy(lio_ooo_cache);
632 kmem_cache_destroy(lio_r2t_cache);
633
634 iscsi_target_deregister_configfs();
635
636 kfree(iscsit_global);
637}
638
8b1e1244 639static int iscsit_add_reject(
ba159914 640 struct iscsi_conn *conn,
e48354ce 641 u8 reason,
ba159914 642 unsigned char *buf)
e48354ce
NB		 643{
644 struct iscsi_cmd *cmd;
e48354ce 645
676687c6 646 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 647 if (!cmd)
648 return -1;
649
650 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 651 cmd->reject_reason = reason;
e48354ce 652
1c3d5794 653 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 654 if (!cmd->buf_ptr) {
655 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 656 iscsit_free_cmd(cmd, false);
e48354ce
NB		 657 return -1;
658 }
e48354ce
NB		 659
660 spin_lock_bh(&conn->cmd_lock);
2fbb471e 661 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 662 spin_unlock_bh(&conn->cmd_lock);
663
664 cmd->i_state = ISTATE_SEND_REJECT;
665 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
666
ba159914 667 return -1;
e48354ce
NB		 668}
669
ba159914
NB		 670static int iscsit_add_reject_from_cmd(
671 struct iscsi_cmd *cmd,
e48354ce 672 u8 reason,
ba159914
NB		 673 bool add_to_conn,
674 unsigned char *buf)
e48354ce
NB		 675{
676 struct iscsi_conn *conn;
e48354ce
NB		 677
678 if (!cmd->conn) {
679 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
680 cmd->init_task_tag);
681 return -1;
682 }
683 conn = cmd->conn;
684
685 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 686 cmd->reject_reason = reason;
e48354ce 687
1c3d5794 688 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 689 if (!cmd->buf_ptr) {
690 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 691 iscsit_free_cmd(cmd, false);
e48354ce
NB		 692 return -1;
693 }
e48354ce
NB		 694
695 if (add_to_conn) {
696 spin_lock_bh(&conn->cmd_lock);
2fbb471e 697 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 698 spin_unlock_bh(&conn->cmd_lock);
699 }
700
701 cmd->i_state = ISTATE_SEND_REJECT;
702 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 703 /*
704 * Perform the kref_put now if se_cmd has already been setup by
705 * scsit_setup_scsi_cmd()
706 */
707 if (cmd->se_cmd.se_tfo != NULL) {
708 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
709 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
710 }
ba159914
NB		 711 return -1;
712}
e48354ce 713
ba159914
NB		 714static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
715 unsigned char *buf)
716{
717 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
718}
719
720int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
721{
722 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 723}
724
725/*
726 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 727 * kernel sockets to copy data in/out.
e48354ce
NB		 728 */
729static int iscsit_map_iovec(
730 struct iscsi_cmd *cmd,
731 struct kvec *iov,
732 u32 data_offset,
733 u32 data_length)
734{
735 u32 i = 0;
736 struct scatterlist *sg;
737 unsigned int page_off;
738
739 /*
bfb79eac 740 * We know each entry in t_data_sg contains a page.
e48354ce 741 */
bfb79eac 742 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 743 page_off = (data_offset % PAGE_SIZE);
744
745 cmd->first_data_sg = sg;
746 cmd->first_data_sg_off = page_off;
747
748 while (data_length) {
749 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
750
751 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
752 iov[i].iov_len = cur_len;
753
754 data_length -= cur_len;
755 page_off = 0;
756 sg = sg_next(sg);
757 i++;
758 }
759
760 cmd->kmapped_nents = i;
761
762 return i;
763}
764
765static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
766{
767 u32 i;
768 struct scatterlist *sg;
769
770 sg = cmd->first_data_sg;
771
772 for (i = 0; i < cmd->kmapped_nents; i++)
773 kunmap(sg_page(&sg[i]));
774}
775
776static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
777{
f56cbbb4
NB		 778 LIST_HEAD(ack_list);
779 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 780
781 conn->exp_statsn = exp_statsn;
782
3e1c81a9
NB		 783 if (conn->sess->sess_ops->RDMAExtensions)
784 return;
785
e48354ce 786 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 787 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 788 spin_lock(&cmd->istate_lock);
789 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 790 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 791 cmd->i_state = ISTATE_REMOVE;
792 spin_unlock(&cmd->istate_lock);
f56cbbb4 793 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 794 continue;
795 }
796 spin_unlock(&cmd->istate_lock);
797 }
798 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 799
800 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 801 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 802 iscsit_free_cmd(cmd, false);
803 }
e48354ce
NB		 804}
805
806static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
807{
f80e8ed3 808 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 809
c0427f15 810 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 811
812 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
813 if (!cmd->iov_data) {
814 pr_err("Unable to allocate cmd->iov_data\n");
815 return -ENOMEM;
816 }
817
818 cmd->orig_iov_data_count = iov_count;
819 return 0;
820}
821
3e1c81a9
NB		 822int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
823 unsigned char *buf)
e48354ce 824{
3e1c81a9 825 int data_direction, payload_length;
e48354ce 826 struct iscsi_scsi_req *hdr;
d28b1169
AG		 827 int iscsi_task_attr;
828 int sam_task_attr;
e48354ce 829
04f3b31b 830 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 831
832 hdr = (struct iscsi_scsi_req *) buf;
833 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 834
835 /* FIXME; Add checks for AdditionalHeaderSegment */
836
837 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
838 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
839 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
840 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 841 return iscsit_add_reject_cmd(cmd,
842 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 843 }
844
845 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
846 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
847 /*
4454b66c
NB		 848 * From RFC-3720 Section 10.3.1:
849 *
850 * "Either or both of R and W MAY be 1 when either the
851 * Expected Data Transfer Length and/or Bidirectional Read
852 * Expected Data Transfer Length are 0"
853 *
854 * For this case, go ahead and clear the unnecssary bits
855 * to avoid any confusion with ->data_direction.
e48354ce 856 */
4454b66c
NB		 857 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
858 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 859
4454b66c 860 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 861 " set when Expected Data Transfer Length is 0 for"
4454b66c 862 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 863 }
e48354ce
NB		 864
865 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
866 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
867 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
868 " MUST be set if Expected Data Transfer Length is not 0."
869 " Bad iSCSI Initiator\n");
ba159914
NB		 870 return iscsit_add_reject_cmd(cmd,
871 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 872 }
873
874 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
875 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
876 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 877 return iscsit_add_reject_cmd(cmd,
878 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 879 }
880
881 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
882 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
883 " Scsi Command PDU.\n");
ba159914
NB		 884 return iscsit_add_reject_cmd(cmd,
885 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 886 }
887
888 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
889 pr_err("ImmediateData=No but DataSegmentLength=%u,"
890 " protocol error.\n", payload_length);
ba159914
NB		 891 return iscsit_add_reject_cmd(cmd,
892 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 893 }
894
ba159914 895 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 896 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
897 pr_err("Expected Data Transfer Length and Length of"
898 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
899 " bit is not set protocol error\n");
ba159914
NB		 900 return iscsit_add_reject_cmd(cmd,
901 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 902 }
903
50e5c87d 904 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 905 pr_err("DataSegmentLength: %u is greater than"
906 " EDTL: %u, protocol error.\n", payload_length,
907 hdr->data_length);
ba159914
NB		 908 return iscsit_add_reject_cmd(cmd,
909 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 910 }
911
21f5aa7e 912 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 913 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 914 " MaxXmitDataSegmentLength: %u, protocol error.\n",
915 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 916 return iscsit_add_reject_cmd(cmd,
917 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 918 }
919
920 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
921 pr_err("DataSegmentLength: %u is greater than"
922 " FirstBurstLength: %u, protocol error.\n",
923 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 924 return iscsit_add_reject_cmd(cmd,
925 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 926 }
927
928 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
929 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
930 DMA_NONE;
931
d28b1169 932 cmd->data_direction = data_direction;
d28b1169
AG		 933 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
934 /*
935 * Figure out the SAM Task Attribute for the incoming SCSI CDB
936 */
937 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
938 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
939 sam_task_attr = MSG_SIMPLE_TAG;
940 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
941 sam_task_attr = MSG_ORDERED_TAG;
942 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
943 sam_task_attr = MSG_HEAD_TAG;
944 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
945 sam_task_attr = MSG_ACA_TAG;
946 else {
947 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
948 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
949 sam_task_attr = MSG_SIMPLE_TAG;
950 }
951
e48354ce
NB		 952 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
953 cmd->i_state = ISTATE_NEW_CMD;
954 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
955 cmd->immediate_data = (payload_length) ? 1 : 0;
956 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
957 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
958 if (cmd->unsolicited_data)
959 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
960
961 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
962 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
963 spin_lock_bh(&conn->sess->ttt_lock);
964 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
965 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
966 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
967 spin_unlock_bh(&conn->sess->ttt_lock);
968 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
969 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 970 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
971 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 972 cmd->first_burst_len = payload_length;
973
3e1c81a9
NB		 974 if (!conn->sess->sess_ops->RDMAExtensions &&
975 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 976 struct iscsi_datain_req *dr;
977
978 dr = iscsit_allocate_datain_req();
979 if (!dr)
ba159914
NB		 980 return iscsit_add_reject_cmd(cmd,
981 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 982
983 iscsit_attach_datain_req(cmd, dr);
984 }
985
065ca1e4
AG		 986 /*
987 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
988 */
989 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 990 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
991 cmd->data_direction, sam_task_attr,
992 cmd->sense_buffer + 2);
065ca1e4
AG		 993
994 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
995 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 996 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
997 conn->cid);
998
999 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 1000
de103c93
CH		 1001 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1002 scsilun_to_int(&hdr->lun));
1003 if (cmd->sense_reason)
1004 goto attach_cmd;
1005
1006 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1007 if (cmd->sense_reason) {
1008 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1009 return iscsit_add_reject_cmd(cmd,
1010 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1011 }
de103c93 1012
e48354ce
NB		 1013 goto attach_cmd;
1014 }
a12f41f8 1015
de103c93 1016 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1017 return iscsit_add_reject_cmd(cmd,
1018 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1019 }
1020
1021attach_cmd:
1022 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1023 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1024 spin_unlock_bh(&conn->cmd_lock);
1025 /*
1026 * Check if we need to delay processing because of ALUA
1027 * Active/NonOptimized primary access state..
1028 */
1029 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1030
3e1c81a9
NB		 1031 return 0;
1032}
1033EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1034
3e1c81a9
NB		 1035void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1036{
1037 iscsit_set_dataout_sequence_values(cmd);
1038
1039 spin_lock_bh(&cmd->dataout_timeout_lock);
1040 iscsit_start_dataout_timer(cmd, cmd->conn);
1041 spin_unlock_bh(&cmd->dataout_timeout_lock);
1042}
1043EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1044
1045int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1046 struct iscsi_scsi_req *hdr)
1047{
1048 int cmdsn_ret = 0;
e48354ce
NB		 1049 /*
1050 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1051 * the Immediate Bit is not set, and no Immediate
1052 * Data is attached.
1053 *
1054 * A PDU/CmdSN carrying Immediate Data can only
1055 * be processed after the DataCRC has passed.
1056 * If the DataCRC fails, the CmdSN MUST NOT
1057 * be acknowledged. (See below)
1058 */
1059 if (!cmd->immediate_data) {
561bf158
NB		 1060 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1061 (unsigned char *)hdr, hdr->cmdsn);
1062 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1063 return -1;
1064 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1065 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1066 return 0;
3e1c81a9 1067 }
e48354ce
NB		 1068 }
1069
50e5c87d 1070 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1071
1072 /*
1073 * If no Immediate Data is attached, it's OK to return now.
1074 */
1075 if (!cmd->immediate_data) {
3e1c81a9
NB		 1076 if (!cmd->sense_reason && cmd->unsolicited_data)
1077 iscsit_set_unsoliticed_dataout(cmd);
1078 if (!cmd->sense_reason)
1079 return 0;
e48354ce 1080
3e1c81a9 1081 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1082 return 0;
1083 }
1084
1085 /*
3e1c81a9
NB		 1086 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1087 * execution. These exceptions are processed in CmdSN order using
1088 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1089 */
de103c93 1090 if (cmd->sense_reason) {
561bf158
NB		 1091 if (cmd->reject_reason)
1092 return 0;
1093
3e1c81a9 1094 return 1;
e48354ce
NB		 1095 }
1096 /*
1097 * Call directly into transport_generic_new_cmd() to perform
1098 * the backend memory allocation.
1099 */
de103c93 1100 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1101 if (cmd->sense_reason)
3e1c81a9 1102 return 1;
e48354ce 1103
3e1c81a9
NB		 1104 return 0;
1105}
1106EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1107
1108static int
1109iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1110 bool dump_payload)
1111{
561bf158 1112 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1113 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1114 /*
1115 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1116 */
1117 if (dump_payload == true)
1118 goto after_immediate_data;
1119
1120 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1121 cmd->first_burst_len);
e48354ce
NB		 1122after_immediate_data:
1123 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1124 /*
1125 * A PDU/CmdSN carrying Immediate Data passed
1126 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1127 * Immediate Bit is not set.
1128 */
561bf158
NB		 1129 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1130 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1131 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1132 return -1;
3e1c81a9 1133
9d86a2be 1134 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1135 int rc;
1136
1137 rc = iscsit_dump_data_payload(cmd->conn,
1138 cmd->first_burst_len, 1);
1139 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1140 return rc;
3e1c81a9
NB		 1141 } else if (cmd->unsolicited_data)
1142 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1143
e48354ce
NB		 1144 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1145 /*
1146 * Immediate Data failed DataCRC and ERL>=1,
1147 * silently drop this PDU and let the initiator
1148 * plug the CmdSN gap.
1149 *
1150 * FIXME: Send Unsolicited NOPIN with reserved
1151 * TTT here to help the initiator figure out
1152 * the missing CmdSN, although they should be
1153 * intelligent enough to determine the missing
1154 * CmdSN and issue a retry to plug the sequence.
1155 */
1156 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1157 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1158 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1159 return -1;
1160
1161 return 0;
1162}
1163
3e1c81a9
NB		 1164static int
1165iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1166 unsigned char *buf)
1167{
1168 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1169 int rc, immed_data;
1170 bool dump_payload = false;
1171
1172 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1173 if (rc < 0)
561bf158 1174 return 0;
3e1c81a9
NB		 1175 /*
1176 * Allocation iovecs needed for struct socket operations for
1177 * traditional iSCSI block I/O.
1178 */
1179 if (iscsit_allocate_iovecs(cmd) < 0) {
ba159914
NB		 1180 return iscsit_add_reject_cmd(cmd,
1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1182 }
1183 immed_data = cmd->immediate_data;
1184
1185 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1186 if (rc < 0)
1187 return rc;
1188 else if (rc > 0)
1189 dump_payload = true;
1190
1191 if (!immed_data)
1192 return 0;
1193
1194 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1195}
1196
e48354ce
NB		 1197static u32 iscsit_do_crypto_hash_sg(
1198 struct hash_desc *hash,
1199 struct iscsi_cmd *cmd,
1200 u32 data_offset,
1201 u32 data_length,
1202 u32 padding,
1203 u8 *pad_bytes)
1204{
1205 u32 data_crc;
1206 u32 i;
1207 struct scatterlist *sg;
1208 unsigned int page_off;
1209
1210 crypto_hash_init(hash);
1211
1212 sg = cmd->first_data_sg;
1213 page_off = cmd->first_data_sg_off;
1214
1215 i = 0;
1216 while (data_length) {
1217 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1218
1219 crypto_hash_update(hash, &sg[i], cur_len);
1220
1221 data_length -= cur_len;
1222 page_off = 0;
1223 i++;
1224 }
1225
1226 if (padding) {
1227 struct scatterlist pad_sg;
1228
1229 sg_init_one(&pad_sg, pad_bytes, padding);
1230 crypto_hash_update(hash, &pad_sg, padding);
1231 }
1232 crypto_hash_final(hash, (u8 *) &data_crc);
1233
1234 return data_crc;
1235}
1236
1237static void iscsit_do_crypto_hash_buf(
1238 struct hash_desc *hash,
80690fdb 1239 const void *buf,
e48354ce
NB		 1240 u32 payload_length,
1241 u32 padding,
1242 u8 *pad_bytes,
1243 u8 *data_crc)
1244{
1245 struct scatterlist sg;
1246
1247 crypto_hash_init(hash);
1248
8359cf43 1249 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1250 crypto_hash_update(hash, &sg, payload_length);
1251
1252 if (padding) {
1253 sg_init_one(&sg, pad_bytes, padding);
1254 crypto_hash_update(hash, &sg, padding);
1255 }
1256 crypto_hash_final(hash, data_crc);
1257}
1258
3e1c81a9
NB		 1259int
1260iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1261 struct iscsi_cmd **out_cmd)
e48354ce 1262{
3e1c81a9 1263 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1264 struct iscsi_cmd *cmd = NULL;
1265 struct se_cmd *se_cmd;
3e1c81a9
NB		 1266 u32 payload_length = ntoh24(hdr->dlength);
1267 int rc;
e48354ce
NB		 1268
1269 if (!payload_length) {
dbcbc95c
NB		 1270 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1271 return 0;
e48354ce
NB		 1272 }
1273
1274 /* iSCSI write */
04f3b31b 1275 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1276
21f5aa7e 1277 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1278 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1279 " MaxXmitDataSegmentLength: %u\n", payload_length,
1280 conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1281 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1282 buf);
e48354ce
NB		 1283 }
1284
1285 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1286 payload_length);
1287 if (!cmd)
1288 return 0;
1289
1290 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1291 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1292 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1293 payload_length, conn->cid);
1294
1295 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1296 pr_err("Command ITT: 0x%08x received DataOUT after"
1297 " last DataOUT received, dumping payload\n",
1298 cmd->init_task_tag);
1299 return iscsit_dump_data_payload(conn, payload_length, 1);
1300 }
1301
1302 if (cmd->data_direction != DMA_TO_DEVICE) {
1303 pr_err("Command ITT: 0x%08x received DataOUT for a"
1304 " NON-WRITE command.\n", cmd->init_task_tag);
ba159914 1305 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1306 }
1307 se_cmd = &cmd->se_cmd;
1308 iscsit_mod_dataout_timer(cmd);
1309
50e5c87d 1310 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1311 pr_err("DataOut Offset: %u, Length %u greater than"
1312 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1313 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1314 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1315 }
1316
1317 if (cmd->unsolicited_data) {
1318 int dump_unsolicited_data = 0;
1319
1320 if (conn->sess->sess_ops->InitialR2T) {
1321 pr_err("Received unexpected unsolicited data"
1322 " while InitialR2T=Yes, protocol error.\n");
1323 transport_send_check_condition_and_sense(&cmd->se_cmd,
1324 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1325 return -1;
1326 }
1327 /*
1328 * Special case for dealing with Unsolicited DataOUT
1329 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1330 * failures;
1331 */
1332
1333 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1334 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1335 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1336 dump_unsolicited_data = 1;
e48354ce
NB		 1337
1338 if (dump_unsolicited_data) {
1339 /*
1340 * Check if a delayed TASK_ABORTED status needs to
1341 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1342 * received with the unsolicitied data out.
1343 */
1344 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1345 iscsit_stop_dataout_timer(cmd);
1346
1347 transport_check_aborted_status(se_cmd,
1348 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1349 return iscsit_dump_data_payload(conn, payload_length, 1);
1350 }
1351 } else {
1352 /*
1353 * For the normal solicited data path:
1354 *
1355 * Check for a delayed TASK_ABORTED status and dump any
1356 * incoming data out payload if one exists. Also, when the
1357 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1358 * data out sequence, we decrement outstanding_r2ts. Once
1359 * outstanding_r2ts reaches zero, go ahead and send the delayed
1360 * TASK_ABORTED status.
1361 */
7d680f3b 1362 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1363 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1364 if (--cmd->outstanding_r2ts < 1) {
1365 iscsit_stop_dataout_timer(cmd);
1366 transport_check_aborted_status(
1367 se_cmd, 1);
1368 }
1369
1370 return iscsit_dump_data_payload(conn, payload_length, 1);
1371 }
1372 }
1373 /*
1374 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1375 * within-command recovery checks before receiving the payload.
1376 */
3e1c81a9
NB		 1377 rc = iscsit_check_pre_dataout(cmd, buf);
1378 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1379 return 0;
3e1c81a9 1380 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1381 return -1;
1382
3e1c81a9
NB		 1383 *out_cmd = cmd;
1384 return 0;
1385}
1386EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1387
1388static int
1389iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1390 struct iscsi_data *hdr)
1391{
1392 struct kvec *iov;
1393 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1394 u32 payload_length = ntoh24(hdr->dlength);
1395 int iov_ret, data_crc_failed = 0;
1396
e48354ce
NB		 1397 rx_size += payload_length;
1398 iov = &cmd->iov_data[0];
1399
50e5c87d
CH		 1400 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1401 payload_length);
e48354ce
NB		 1402 if (iov_ret < 0)
1403 return -1;
1404
1405 iov_count += iov_ret;
1406
1407 padding = ((-payload_length) & 3);
1408 if (padding != 0) {
1409 iov[iov_count].iov_base = cmd->pad_bytes;
1410 iov[iov_count++].iov_len = padding;
1411 rx_size += padding;
1412 pr_debug("Receiving %u padding bytes.\n", padding);
1413 }
1414
1415 if (conn->conn_ops->DataDigest) {
1416 iov[iov_count].iov_base = &checksum;
1417 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1418 rx_size += ISCSI_CRC_LEN;
1419 }
1420
1421 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1422
1423 iscsit_unmap_iovec(cmd);
1424
1425 if (rx_got != rx_size)
1426 return -1;
1427
1428 if (conn->conn_ops->DataDigest) {
1429 u32 data_crc;
1430
1431 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1432 be32_to_cpu(hdr->offset),
1433 payload_length, padding,
e48354ce
NB		 1434 cmd->pad_bytes);
1435
1436 if (checksum != data_crc) {
1437 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1438 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1439 " does not match computed 0x%08x\n",
1440 hdr->itt, hdr->offset, payload_length,
1441 hdr->datasn, checksum, data_crc);
1442 data_crc_failed = 1;
1443 } else {
1444 pr_debug("Got CRC32C DataDigest 0x%08x for"
1445 " %u bytes of Data Out\n", checksum,
1446 payload_length);
1447 }
1448 }
3e1c81a9
NB		 1449
1450 return data_crc_failed;
1451}
1452
1453int
1454iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1455 bool data_crc_failed)
1456{
1457 struct iscsi_conn *conn = cmd->conn;
1458 int rc, ooo_cmdsn;
e48354ce
NB		 1459 /*
1460 * Increment post receive data and CRC values or perform
1461 * within-command recovery.
1462 */
3e1c81a9
NB		 1463 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1464 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1465 return 0;
3e1c81a9 1466 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1467 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1468 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1469 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1470 /*
1471 * Handle extra special case for out of order
1472 * Unsolicited Data Out.
1473 */
1474 spin_lock_bh(&cmd->istate_lock);
1475 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1476 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1477 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1478 spin_unlock_bh(&cmd->istate_lock);
1479
1480 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1481 if (ooo_cmdsn)
1482 return 0;
1483 target_execute_cmd(&cmd->se_cmd);
1484 return 0;
e48354ce
NB		 1485 } else /* DATAOUT_CANNOT_RECOVER */
1486 return -1;
1487
1488 return 0;
1489}
3e1c81a9 1490EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1491
3e1c81a9
NB		 1492static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1493{
dbcbc95c 1494 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1495 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1496 int rc;
1497 bool data_crc_failed = false;
1498
1499 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1500 if (rc < 0)
561bf158 1501 return 0;
3e1c81a9
NB		 1502 else if (!cmd)
1503 return 0;
1504
1505 rc = iscsit_get_dataout(conn, cmd, hdr);
1506 if (rc < 0)
1507 return rc;
1508 else if (rc > 0)
1509 data_crc_failed = true;
1510
1511 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1512}
1513
778de368
NB		 1514int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1515 struct iscsi_nopout *hdr)
e48354ce 1516{
778de368 1517 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1518
a3662605
AH		 1519 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1520 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1521 if (!cmd)
1522 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1523 (unsigned char *)hdr);
1524
1525 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1526 (unsigned char *)hdr);
1527 }
1528
66c7db68 1529 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1530 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1531 " not set, protocol error.\n");
28aaa950
NB		 1532 if (!cmd)
1533 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1534 (unsigned char *)hdr);
1535
ba159914
NB		 1536 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1537 (unsigned char *)hdr);
e48354ce
NB		 1538 }
1539
21f5aa7e 1540 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1541 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1542 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1543 " error.\n", payload_length,
21f5aa7e 1544 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1545 if (!cmd)
1546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1547 (unsigned char *)hdr);
1548
ba159914
NB		 1549 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1550 (unsigned char *)hdr);
e48354ce
NB		 1551 }
1552
3e1c81a9 1553 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1554 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1555 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1556 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1557 payload_length);
1558 /*
1559 * This is not a response to a Unsolicited NopIN, which means
1560 * it can either be a NOPOUT ping request (with a valid ITT),
1561 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1562 * Either way, make sure we allocate an struct iscsi_cmd, as both
1563 * can contain ping data.
1564 */
50e5c87d 1565 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1566 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1567 cmd->i_state = ISTATE_SEND_NOPIN;
1568 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1569 1 : 0);
1570 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1571 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1572 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1573 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1574 cmd->data_direction = DMA_NONE;
1575 }
1576
778de368
NB		 1577 return 0;
1578}
1579EXPORT_SYMBOL(iscsit_setup_nop_out);
1580
1581int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1582 struct iscsi_nopout *hdr)
1583{
1584 struct iscsi_cmd *cmd_p = NULL;
1585 int cmdsn_ret = 0;
1586 /*
1587 * Initiator is expecting a NopIN ping reply..
1588 */
1589 if (hdr->itt != RESERVED_ITT) {
1590 BUG_ON(!cmd);
1591
1592 spin_lock_bh(&conn->cmd_lock);
1593 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1594 spin_unlock_bh(&conn->cmd_lock);
1595
1596 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1597
1598 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1599 iscsit_add_cmd_to_response_queue(cmd, conn,
1600 cmd->i_state);
1601 return 0;
1602 }
1603
561bf158
NB		 1604 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1605 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1606 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1607 return 0;
778de368 1608 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1609 return -1;
778de368
NB		 1610
1611 return 0;
1612 }
1613 /*
1614 * This was a response to a unsolicited NOPIN ping.
1615 */
1616 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1617 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1618 if (!cmd_p)
1619 return -EINVAL;
1620
1621 iscsit_stop_nopin_response_timer(conn);
1622
1623 cmd_p->i_state = ISTATE_REMOVE;
1624 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1625
1626 iscsit_start_nopin_timer(conn);
1627 return 0;
1628 }
1629 /*
1630 * Otherwise, initiator is not expecting a NOPIN is response.
1631 * Just ignore for now.
1632 */
1633 return 0;
1634}
1635EXPORT_SYMBOL(iscsit_process_nop_out);
1636
1637static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1638 unsigned char *buf)
1639{
1640 unsigned char *ping_data = NULL;
1641 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1642 struct kvec *iov = NULL;
1643 u32 payload_length = ntoh24(hdr->dlength);
1644 int ret;
1645
1646 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1647 if (ret < 0)
561bf158 1648 return 0;
778de368
NB		 1649 /*
1650 * Handle NOP-OUT payload for traditional iSCSI sockets
1651 */
50e5c87d 1652 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1653 u32 checksum, data_crc, padding = 0;
1654 int niov = 0, rx_got, rx_size = payload_length;
1655
e48354ce
NB		 1656 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1657 if (!ping_data) {
1658 pr_err("Unable to allocate memory for"
1659 " NOPOUT ping data.\n");
1660 ret = -1;
1661 goto out;
1662 }
1663
1664 iov = &cmd->iov_misc[0];
1665 iov[niov].iov_base = ping_data;
1666 iov[niov++].iov_len = payload_length;
1667
1668 padding = ((-payload_length) & 3);
1669 if (padding != 0) {
1670 pr_debug("Receiving %u additional bytes"
1671 " for padding.\n", padding);
1672 iov[niov].iov_base = &cmd->pad_bytes;
1673 iov[niov++].iov_len = padding;
1674 rx_size += padding;
1675 }
1676 if (conn->conn_ops->DataDigest) {
1677 iov[niov].iov_base = &checksum;
1678 iov[niov++].iov_len = ISCSI_CRC_LEN;
1679 rx_size += ISCSI_CRC_LEN;
1680 }
1681
1682 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1683 if (rx_got != rx_size) {
1684 ret = -1;
1685 goto out;
1686 }
1687
1688 if (conn->conn_ops->DataDigest) {
1689 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1690 ping_data, payload_length,
1691 padding, cmd->pad_bytes,
1692 (u8 *)&data_crc);
1693
1694 if (checksum != data_crc) {
1695 pr_err("Ping data CRC32C DataDigest"
1696 " 0x%08x does not match computed 0x%08x\n",
1697 checksum, data_crc);
1698 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1699 pr_err("Unable to recover from"
1700 " NOPOUT Ping DataCRC failure while in"
1701 " ERL=0.\n");
1702 ret = -1;
1703 goto out;
1704 } else {
1705 /*
1706 * Silently drop this PDU and let the
1707 * initiator plug the CmdSN gap.
1708 */
1709 pr_debug("Dropping NOPOUT"
1710 " Command CmdSN: 0x%08x due to"
1711 " DataCRC error.\n", hdr->cmdsn);
1712 ret = 0;
1713 goto out;
1714 }
1715 } else {
1716 pr_debug("Got CRC32C DataDigest"
1717 " 0x%08x for %u bytes of ping data.\n",
1718 checksum, payload_length);
1719 }
1720 }
1721
1722 ping_data[payload_length] = '\0';
1723 /*
1724 * Attach ping data to struct iscsi_cmd->buf_ptr.
1725 */
8359cf43 1726 cmd->buf_ptr = ping_data;
e48354ce
NB		 1727 cmd->buf_ptr_size = payload_length;
1728
1729 pr_debug("Got %u bytes of NOPOUT ping"
1730 " data.\n", payload_length);
1731 pr_debug("Ping Data: \"%s\"\n", ping_data);
1732 }
1733
778de368 1734 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1735out:
1736 if (cmd)
aafc9d15 1737 iscsit_free_cmd(cmd, false);
778de368 1738
e48354ce
NB		 1739 kfree(ping_data);
1740 return ret;
1741}
1742
3e1c81a9
NB		 1743int
1744iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1745 unsigned char *buf)
e48354ce 1746{
e48354ce
NB		 1747 struct se_tmr_req *se_tmr;
1748 struct iscsi_tmr_req *tmr_req;
1749 struct iscsi_tm *hdr;
186a9647
NB		 1750 int out_of_order_cmdsn = 0, ret;
1751 bool sess_ref = false;
e48354ce
NB		 1752 u8 function;
1753
1754 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1755 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1756 function = hdr->flags;
1757
1758 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1759 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1760 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1761 hdr->rtt, hdr->refcmdsn, conn->cid);
1762
1763 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1764 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1765 hdr->rtt != RESERVED_ITT)) {
e48354ce 1766 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1767 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1768 }
1769
1770 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1771 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1772 pr_err("Task Management Request TASK_REASSIGN not"
1773 " issued as immediate command, bad iSCSI Initiator"
1774 "implementation\n");
ba159914
NB		 1775 return iscsit_add_reject_cmd(cmd,
1776 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1777 }
1778 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1779 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1780 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1781
d28b1169
AG		 1782 cmd->data_direction = DMA_NONE;
1783
1784 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1785 if (!cmd->tmr_req) {
1786 pr_err("Unable to allocate memory for"
1787 " Task Management command!\n");
ba159914
NB		 1788 return iscsit_add_reject_cmd(cmd,
1789 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1790 buf);
d28b1169
AG		 1791 }
1792
1793 /*
1794 * TASK_REASSIGN for ERL=2 / connection stays inside of
1795 * LIO-Target $FABRIC_MOD
1796 */
1797 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1798
1799 u8 tcm_function;
1800 int ret;
1801
1802 transport_init_se_cmd(&cmd->se_cmd,
1803 &lio_target_fabric_configfs->tf_ops,
1804 conn->sess->se_sess, 0, DMA_NONE,
9c58b7dd 1805 MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1806
186a9647
NB		 1807 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1808 sess_ref = true;
1809
d28b1169
AG		 1810 switch (function) {
1811 case ISCSI_TM_FUNC_ABORT_TASK:
1812 tcm_function = TMR_ABORT_TASK;
1813 break;
1814 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1815 tcm_function = TMR_ABORT_TASK_SET;
1816 break;
1817 case ISCSI_TM_FUNC_CLEAR_ACA:
1818 tcm_function = TMR_CLEAR_ACA;
1819 break;
1820 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1821 tcm_function = TMR_CLEAR_TASK_SET;
1822 break;
1823 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1824 tcm_function = TMR_LUN_RESET;
1825 break;
1826 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1827 tcm_function = TMR_TARGET_WARM_RESET;
1828 break;
1829 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1830 tcm_function = TMR_TARGET_COLD_RESET;
1831 break;
1832 default:
1833 pr_err("Unknown iSCSI TMR Function:"
1834 " 0x%02x\n", function);
ba159914
NB		 1835 return iscsit_add_reject_cmd(cmd,
1836 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1837 }
1838
1839 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1840 tcm_function, GFP_KERNEL);
1841 if (ret < 0)
ba159914
NB		 1842 return iscsit_add_reject_cmd(cmd,
1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1844
1845 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1846 }
e48354ce
NB		 1847
1848 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1849 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1850 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1851 cmd->init_task_tag = hdr->itt;
1852 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1853 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1854 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1855 se_tmr = cmd->se_cmd.se_tmr_req;
1856 tmr_req = cmd->tmr_req;
1857 /*
1858 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1859 */
1860 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1861 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1862 scsilun_to_int(&hdr->lun));
e48354ce 1863 if (ret < 0) {
e48354ce
NB		 1864 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1865 goto attach;
1866 }
1867 }
1868
1869 switch (function) {
1870 case ISCSI_TM_FUNC_ABORT_TASK:
1871 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1872 if (se_tmr->response)
e48354ce 1873 goto attach;
e48354ce
NB		 1874 break;
1875 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1876 case ISCSI_TM_FUNC_CLEAR_ACA:
1877 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1878 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1879 break;
1880 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1881 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1882 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1883 goto attach;
1884 }
1885 break;
1886 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1887 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1889 goto attach;
1890 }
1891 break;
1892 case ISCSI_TM_FUNC_TASK_REASSIGN:
1893 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1894 /*
1895 * Perform sanity checks on the ExpDataSN only if the
1896 * TASK_REASSIGN was successful.
1897 */
de103c93 1898 if (se_tmr->response)
e48354ce
NB		 1899 break;
1900
1901 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 1902 return iscsit_add_reject_cmd(cmd,
1903 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1904 break;
1905 default:
1906 pr_err("Unknown TMR function: 0x%02x, protocol"
1907 " error.\n", function);
e48354ce
NB		 1908 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1909 goto attach;
1910 }
1911
1912 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1913 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1914 se_tmr->call_transport = 1;
1915attach:
1916 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1917 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1918 spin_unlock_bh(&conn->cmd_lock);
1919
1920 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 1921 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1922 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1923 out_of_order_cmdsn = 1;
5a4c8666 1924 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1925 return 0;
5a4c8666 1926 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1927 return -1;
e48354ce 1928 }
50e5c87d 1929 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1930
5a4c8666 1931 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1932 return 0;
1933 /*
1934 * Found the referenced task, send to transport for processing.
1935 */
1936 if (se_tmr->call_transport)
1937 return transport_generic_handle_tmr(&cmd->se_cmd);
1938
1939 /*
1940 * Could not find the referenced LUN, task, or Task Management
1941 * command not authorized or supported. Change state and
1942 * let the tx_thread send the response.
1943 *
1944 * For connection recovery, this is also the default action for
1945 * TMR TASK_REASSIGN.
1946 */
186a9647
NB		 1947 if (sess_ref) {
1948 pr_debug("Handle TMR, using sess_ref=true check\n");
1949 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1950 }
1951
e48354ce
NB		 1952 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1953 return 0;
1954}
3e1c81a9 1955EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1956
1957/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 1958int
1959iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1960 struct iscsi_text *hdr)
e48354ce 1961{
64534aa7 1962 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1963
21f5aa7e 1964 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1965 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1966 "greater than MaxXmitDataSegmentLength %u.\n",
1967 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1968 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1969 (unsigned char *)hdr);
e48354ce
NB		 1970 }
1971
122f8afc
NB		 1972 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1973 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1974 pr_err("Multi sequence text commands currently not supported\n");
1975 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1976 (unsigned char *)hdr);
1977 }
1978
e48354ce
NB		 1979 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1980 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1981 hdr->exp_statsn, payload_length);
1982
64534aa7
NB		 1983 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1984 cmd->i_state = ISTATE_SEND_TEXTRSP;
1985 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1986 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1987 cmd->targ_xfer_tag = 0xFFFFFFFF;
1988 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1989 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1990 cmd->data_direction = DMA_NONE;
1991
1992 return 0;
1993}
1994EXPORT_SYMBOL(iscsit_setup_text_cmd);
1995
1996int
1997iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1998 struct iscsi_text *hdr)
1999{
9864ca9d 2000 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2001 int cmdsn_ret;
2002
9864ca9d
NB		 2003 if (!text_in) {
2004 pr_err("Unable to locate text_in buffer for sendtargets"
2005 " discovery\n");
2006 goto reject;
2007 }
2008 if (strncmp("SendTargets", text_in, 11) != 0) {
2009 pr_err("Received Text Data that is not"
2010 " SendTargets, cannot continue.\n");
2011 goto reject;
2012 }
2013 text_ptr = strchr(text_in, '=');
2014 if (!text_ptr) {
2015 pr_err("No \"=\" separator found in Text Data,"
2016 " cannot continue.\n");
2017 goto reject;
2018 }
2019 if (!strncmp("=All", text_ptr, 4)) {
2020 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
6665889c
NB		 2021 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2022 !strncmp("=eui.", text_ptr, 5)) {
2023 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
9864ca9d
NB		 2024 } else {
2025 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2026 goto reject;
2027 }
2028
64534aa7
NB		 2029 spin_lock_bh(&conn->cmd_lock);
2030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2031 spin_unlock_bh(&conn->cmd_lock);
2032
2033 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2034
2035 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2036 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2037 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2038 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2039 return -1;
2040
64534aa7
NB		 2041 return 0;
2042 }
2043
2044 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2045
2046reject:
ba159914
NB		 2047 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2048 (unsigned char *)hdr);
64534aa7
NB		 2049}
2050EXPORT_SYMBOL(iscsit_process_text_cmd);
2051
2052static int
2053iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2054 unsigned char *buf)
2055{
2056 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2057 char *text_in = NULL;
2058 u32 payload_length = ntoh24(hdr->dlength);
2059 int rx_size, rc;
2060
2061 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2062 if (rc < 0)
561bf158 2063 return 0;
64534aa7
NB		 2064
2065 rx_size = payload_length;
2066 if (payload_length) {
64534aa7
NB		 2067 u32 checksum = 0, data_crc = 0;
2068 u32 padding = 0, pad_bytes = 0;
2069 int niov = 0, rx_got;
2070 struct kvec iov[3];
2071
2072 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2073 if (!text_in) {
2074 pr_err("Unable to allocate memory for"
2075 " incoming text parameters\n");
64534aa7 2076 goto reject;
e48354ce 2077 }
9864ca9d 2078 cmd->text_in_ptr = text_in;
e48354ce
NB		 2079
2080 memset(iov, 0, 3 * sizeof(struct kvec));
2081 iov[niov].iov_base = text_in;
64534aa7 2082 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2083
2084 padding = ((-payload_length) & 3);
2085 if (padding != 0) {
76f1928e 2086 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2087 iov[niov++].iov_len = padding;
2088 rx_size += padding;
2089 pr_debug("Receiving %u additional bytes"
2090 " for padding.\n", padding);
2091 }
2092 if (conn->conn_ops->DataDigest) {
2093 iov[niov].iov_base = &checksum;
2094 iov[niov++].iov_len = ISCSI_CRC_LEN;
2095 rx_size += ISCSI_CRC_LEN;
2096 }
2097
2098 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2099 if (rx_got != rx_size)
2100 goto reject;
e48354ce
NB		 2101
2102 if (conn->conn_ops->DataDigest) {
2103 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
64534aa7 2104 text_in, payload_length,
76f1928e 2105 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2106 (u8 *)&data_crc);
2107
2108 if (checksum != data_crc) {
2109 pr_err("Text data CRC32C DataDigest"
2110 " 0x%08x does not match computed"
2111 " 0x%08x\n", checksum, data_crc);
2112 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2113 pr_err("Unable to recover from"
2114 " Text Data digest failure while in"
2115 " ERL=0.\n");
64534aa7 2116 goto reject;
e48354ce
NB		 2117 } else {
2118 /*
2119 * Silently drop this PDU and let the
2120 * initiator plug the CmdSN gap.
2121 */
2122 pr_debug("Dropping Text"
2123 " Command CmdSN: 0x%08x due to"
2124 " DataCRC error.\n", hdr->cmdsn);
2125 kfree(text_in);
2126 return 0;
2127 }
2128 } else {
2129 pr_debug("Got CRC32C DataDigest"
2130 " 0x%08x for %u bytes of text data.\n",
64534aa7 2131 checksum, payload_length);
e48354ce
NB		 2132 }
2133 }
64534aa7 2134 text_in[payload_length - 1] = '\0';
e48354ce 2135 pr_debug("Successfully read %d bytes of text"
64534aa7 2136 " data.\n", payload_length);
e48354ce
NB		 2137 }
2138
64534aa7 2139 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2140
64534aa7 2141reject:
9864ca9d
NB		 2142 kfree(cmd->text_in_ptr);
2143 cmd->text_in_ptr = NULL;
ba159914 2144 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce 2145}
64534aa7 2146EXPORT_SYMBOL(iscsit_handle_text_cmd);
e48354ce
NB		 2147
2148int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2149{
2150 struct iscsi_conn *conn_p;
2151 struct iscsi_session *sess = conn->sess;
2152
2153 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2154 " for SID: %u.\n", conn->cid, conn->sess->sid);
2155
2156 atomic_set(&sess->session_logout, 1);
2157 atomic_set(&conn->conn_logout_remove, 1);
2158 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2159
2160 iscsit_inc_conn_usage_count(conn);
2161 iscsit_inc_session_usage_count(sess);
2162
2163 spin_lock_bh(&sess->conn_lock);
2164 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2165 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2166 continue;
2167
2168 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2169 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2170 }
2171 spin_unlock_bh(&sess->conn_lock);
2172
2173 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2174
2175 return 0;
2176}
2177
2178int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2179{
2180 struct iscsi_conn *l_conn;
2181 struct iscsi_session *sess = conn->sess;
2182
2183 pr_debug("Received logout request CLOSECONNECTION for CID:"
2184 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2185
2186 /*
2187 * A Logout Request with a CLOSECONNECTION reason code for a CID
2188 * can arrive on a connection with a differing CID.
2189 */
2190 if (conn->cid == cmd->logout_cid) {
2191 spin_lock_bh(&conn->state_lock);
2192 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2193 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2194
2195 atomic_set(&conn->conn_logout_remove, 1);
2196 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2197 iscsit_inc_conn_usage_count(conn);
2198
2199 spin_unlock_bh(&conn->state_lock);
2200 } else {
2201 /*
2202 * Handle all different cid CLOSECONNECTION requests in
2203 * iscsit_logout_post_handler_diffcid() as to give enough
2204 * time for any non immediate command's CmdSN to be
2205 * acknowledged on the connection in question.
2206 *
2207 * Here we simply make sure the CID is still around.
2208 */
2209 l_conn = iscsit_get_conn_from_cid(sess,
2210 cmd->logout_cid);
2211 if (!l_conn) {
2212 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2213 iscsit_add_cmd_to_response_queue(cmd, conn,
2214 cmd->i_state);
2215 return 0;
2216 }
2217
2218 iscsit_dec_conn_usage_count(l_conn);
2219 }
2220
2221 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2222
2223 return 0;
2224}
2225
2226int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2227{
2228 struct iscsi_session *sess = conn->sess;
2229
2230 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2231 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2232
2233 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2234 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2235 " while ERL!=2.\n");
2236 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2237 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2238 return 0;
2239 }
2240
2241 if (conn->cid == cmd->logout_cid) {
2242 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2243 " with CID: %hu on CID: %hu, implementation error.\n",
2244 cmd->logout_cid, conn->cid);
2245 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2246 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247 return 0;
2248 }
2249
2250 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2251
2252 return 0;
2253}
2254
3e1c81a9
NB		 2255int
2256iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2257 unsigned char *buf)
e48354ce
NB		 2258{
2259 int cmdsn_ret, logout_remove = 0;
2260 u8 reason_code = 0;
e48354ce
NB		 2261 struct iscsi_logout *hdr;
2262 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2263
2264 hdr = (struct iscsi_logout *) buf;
2265 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2266
2267 if (tiqn) {
2268 spin_lock(&tiqn->logout_stats.lock);
2269 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2270 tiqn->logout_stats.normal_logouts++;
2271 else
2272 tiqn->logout_stats.abnormal_logouts++;
2273 spin_unlock(&tiqn->logout_stats.lock);
2274 }
2275
2276 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2277 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2278 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2279 hdr->cid, conn->cid);
2280
2281 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2282 pr_err("Received logout request on connection that"
2283 " is not in logged in state, ignoring request.\n");
aafc9d15 2284 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2285 return 0;
2286 }
2287
e48354ce
NB		 2288 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2289 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2290 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2291 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2292 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2293 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2294 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2295 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2296 cmd->logout_reason = reason_code;
2297 cmd->data_direction = DMA_NONE;
2298
2299 /*
2300 * We need to sleep in these cases (by returning 1) until the Logout
2301 * Response gets sent in the tx thread.
2302 */
2303 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2304 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2305 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2306 logout_remove = 1;
2307
2308 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2309 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2310 spin_unlock_bh(&conn->cmd_lock);
2311
2312 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2313 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2314
2315 /*
2316 * Immediate commands are executed, well, immediately.
2317 * Non-Immediate Logout Commands are executed in CmdSN order.
2318 */
c6037cc5 2319 if (cmd->immediate_cmd) {
e48354ce
NB		 2320 int ret = iscsit_execute_cmd(cmd, 0);
2321
2322 if (ret < 0)
2323 return ret;
2324 } else {
561bf158 2325 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2326 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2327 logout_remove = 0;
ba159914
NB		 2328 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2329 return -1;
e48354ce
NB		 2330 }
2331
2332 return logout_remove;
2333}
3e1c81a9 2334EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2335
2336static int iscsit_handle_snack(
2337 struct iscsi_conn *conn,
2338 unsigned char *buf)
2339{
e48354ce
NB		 2340 struct iscsi_snack *hdr;
2341
2342 hdr = (struct iscsi_snack *) buf;
2343 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2344
2345 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2346 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2347 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2348 hdr->begrun, hdr->runlength, conn->cid);
2349
2350 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2351 pr_err("Initiator sent SNACK request while in"
2352 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2353 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2354 buf);
e48354ce
NB		 2355 }
2356 /*
2357 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2358 * call from inside iscsi_send_recovery_datain_or_r2t().
2359 */
2360 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2361 case 0:
2362 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2363 hdr->itt,
2364 be32_to_cpu(hdr->ttt),
2365 be32_to_cpu(hdr->begrun),
2366 be32_to_cpu(hdr->runlength));
e48354ce 2367 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2368 return iscsit_handle_status_snack(conn, hdr->itt,
2369 be32_to_cpu(hdr->ttt),
2370 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2371 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2372 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2373 be32_to_cpu(hdr->begrun),
2374 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2375 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2376 /* FIXME: Support R-Data SNACK */
2377 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2378 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2379 buf);
e48354ce
NB		 2380 default:
2381 pr_err("Unknown SNACK type 0x%02x, protocol"
2382 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2383 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2384 buf);
e48354ce
NB		 2385 }
2386
2387 return 0;
2388}
2389
2390static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2391{
2392 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2393 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2394 wait_for_completion_interruptible_timeout(
2395 &conn->rx_half_close_comp,
2396 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2397 }
2398}
2399
2400static int iscsit_handle_immediate_data(
2401 struct iscsi_cmd *cmd,
3e1c81a9 2402 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2403 u32 length)
2404{
2405 int iov_ret, rx_got = 0, rx_size = 0;
2406 u32 checksum, iov_count = 0, padding = 0;
2407 struct iscsi_conn *conn = cmd->conn;
2408 struct kvec *iov;
2409
2410 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2411 if (iov_ret < 0)
2412 return IMMEDIATE_DATA_CANNOT_RECOVER;
2413
2414 rx_size = length;
2415 iov_count = iov_ret;
2416 iov = &cmd->iov_data[0];
2417
2418 padding = ((-length) & 3);
2419 if (padding != 0) {
2420 iov[iov_count].iov_base = cmd->pad_bytes;
2421 iov[iov_count++].iov_len = padding;
2422 rx_size += padding;
2423 }
2424
2425 if (conn->conn_ops->DataDigest) {
2426 iov[iov_count].iov_base = &checksum;
2427 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2428 rx_size += ISCSI_CRC_LEN;
2429 }
2430
2431 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2432
2433 iscsit_unmap_iovec(cmd);
2434
2435 if (rx_got != rx_size) {
2436 iscsit_rx_thread_wait_for_tcp(conn);
2437 return IMMEDIATE_DATA_CANNOT_RECOVER;
2438 }
2439
2440 if (conn->conn_ops->DataDigest) {
2441 u32 data_crc;
2442
2443 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2444 cmd->write_data_done, length, padding,
2445 cmd->pad_bytes);
2446
2447 if (checksum != data_crc) {
2448 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2449 " does not match computed 0x%08x\n", checksum,
2450 data_crc);
2451
2452 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2453 pr_err("Unable to recover from"
2454 " Immediate Data digest failure while"
2455 " in ERL=0.\n");
ba159914 2456 iscsit_reject_cmd(cmd,
e48354ce 2457 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2458 (unsigned char *)hdr);
e48354ce
NB		 2459 return IMMEDIATE_DATA_CANNOT_RECOVER;
2460 } else {
ba159914 2461 iscsit_reject_cmd(cmd,
e48354ce 2462 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2463 (unsigned char *)hdr);
e48354ce
NB		 2464 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2465 }
2466 } else {
2467 pr_debug("Got CRC32C DataDigest 0x%08x for"
2468 " %u bytes of Immediate Data\n", checksum,
2469 length);
2470 }
2471 }
2472
2473 cmd->write_data_done += length;
2474
ebf1d95c 2475 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2476 spin_lock_bh(&cmd->istate_lock);
2477 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2478 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2479 spin_unlock_bh(&cmd->istate_lock);
2480 }
2481
2482 return IMMEDIATE_DATA_NORMAL_OPERATION;
2483}
2484
2485/*
2486 * Called with sess->conn_lock held.
2487 */
2488/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2489 with active network interface */
2490static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2491{
2492 struct iscsi_cmd *cmd;
2493 struct iscsi_conn *conn_p;
2494
2495 /*
2496 * Only send a Asynchronous Message on connections whos network
2497 * interface is still functional.
2498 */
2499 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2500 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2501 iscsit_inc_conn_usage_count(conn_p);
2502 break;
2503 }
2504 }
2505
2506 if (!conn_p)
2507 return;
2508
676687c6 2509 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2510 if (!cmd) {
2511 iscsit_dec_conn_usage_count(conn_p);
2512 return;
2513 }
2514
2515 cmd->logout_cid = conn->cid;
2516 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2517 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2518
2519 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2520 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2521 spin_unlock_bh(&conn_p->cmd_lock);
2522
2523 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2524 iscsit_dec_conn_usage_count(conn_p);
2525}
2526
2527static int iscsit_send_conn_drop_async_message(
2528 struct iscsi_cmd *cmd,
2529 struct iscsi_conn *conn)
2530{
2531 struct iscsi_async *hdr;
2532
2533 cmd->tx_size = ISCSI_HDR_LEN;
2534 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2535
2536 hdr = (struct iscsi_async *) cmd->pdu;
2537 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2538 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2539 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2540 cmd->targ_xfer_tag = 0xFFFFFFFF;
2541 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2542 cmd->stat_sn = conn->stat_sn++;
2543 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2544 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2545 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2546 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2547 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2548 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2549 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2550
2551 if (conn->conn_ops->HeaderDigest) {
2552 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2553
80690fdb
GU		 2554 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2555 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2556
2557 cmd->tx_size += ISCSI_CRC_LEN;
2558 pr_debug("Attaching CRC32C HeaderDigest to"
2559 " Async Message 0x%08x\n", *header_digest);
2560 }
2561
2562 cmd->iov_misc[0].iov_base = cmd->pdu;
2563 cmd->iov_misc[0].iov_len = cmd->tx_size;
2564 cmd->iov_misc_count = 1;
2565
2566 pr_debug("Sending Connection Dropped Async Message StatSN:"
2567 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2568 cmd->logout_cid, conn->cid);
2569 return 0;
2570}
2571
6f3c0e69
AG		 2572static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2573{
2574 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2575 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2576 wait_for_completion_interruptible_timeout(
2577 &conn->tx_half_close_comp,
2578 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2579 }
2580}
2581
2ec5a8c1
NB		 2582static void
2583iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2584 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2585 bool set_statsn)
e48354ce 2586{
2ec5a8c1
NB		 2587 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2588 hdr->flags = datain->flags;
2589 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2590 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2591 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2592 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2593 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2594 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2595 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2596 }
2597 }
2598 hton24(hdr->dlength, datain->length);
2599 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2600 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2601 (struct scsi_lun *)&hdr->lun);
2602 else
2603 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2604
2605 hdr->itt = cmd->init_task_tag;
2606
2607 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2609 else
2610 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2611 if (set_statsn)
2612 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2613 else
2614 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2615
2616 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2617 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2618 hdr->datasn = cpu_to_be32(datain->data_sn);
2619 hdr->offset = cpu_to_be32(datain->offset);
2620
2621 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2622 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2623 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2624 ntohl(hdr->offset), datain->length, conn->cid);
2625}
2626
2627static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2628{
2629 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2630 struct iscsi_datain datain;
2631 struct iscsi_datain_req *dr;
e48354ce 2632 struct kvec *iov;
2ec5a8c1
NB		 2633 u32 iov_count = 0, tx_size = 0;
2634 int eodr = 0, ret, iov_ret;
2635 bool set_statsn = false;
e48354ce
NB		 2636
2637 memset(&datain, 0, sizeof(struct iscsi_datain));
2638 dr = iscsit_get_datain_values(cmd, &datain);
2639 if (!dr) {
2640 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2641 cmd->init_task_tag);
2642 return -1;
2643 }
e48354ce
NB		 2644 /*
2645 * Be paranoid and double check the logic for now.
2646 */
ebf1d95c 2647 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2648 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2649 " datain.length: %u exceeds cmd->data_length: %u\n",
2650 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2651 cmd->se_cmd.data_length);
e48354ce
NB		 2652 return -1;
2653 }
2654
04f3b31b 2655 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2656 /*
2657 * Special case for successfully execution w/ both DATAIN
2658 * and Sense Data.
2659 */
2660 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2661 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2662 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2663 else {
2664 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2665 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2666 iscsit_increment_maxcmdsn(cmd, conn->sess);
2667 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2668 set_statsn = true;
e48354ce 2669 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2670 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2671 set_statsn = true;
e48354ce
NB		 2672 }
2673
2ec5a8c1 2674 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2675
2676 iov = &cmd->iov_data[0];
2677 iov[iov_count].iov_base = cmd->pdu;
2678 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2679 tx_size += ISCSI_HDR_LEN;
2680
2681 if (conn->conn_ops->HeaderDigest) {
2682 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2683
80690fdb
GU		 2684 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2685 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2686
2687 iov[0].iov_len += ISCSI_CRC_LEN;
2688 tx_size += ISCSI_CRC_LEN;
2689
2690 pr_debug("Attaching CRC32 HeaderDigest"
2691 " for DataIN PDU 0x%08x\n", *header_digest);
2692 }
2693
2ec5a8c1
NB		 2694 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2695 datain.offset, datain.length);
e48354ce
NB		 2696 if (iov_ret < 0)
2697 return -1;
2698
2699 iov_count += iov_ret;
2700 tx_size += datain.length;
2701
2702 cmd->padding = ((-datain.length) & 3);
2703 if (cmd->padding) {
2704 iov[iov_count].iov_base = cmd->pad_bytes;
2705 iov[iov_count++].iov_len = cmd->padding;
2706 tx_size += cmd->padding;
2707
2708 pr_debug("Attaching %u padding bytes\n",
2709 cmd->padding);
2710 }
2711 if (conn->conn_ops->DataDigest) {
2712 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2713 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2714
2715 iov[iov_count].iov_base = &cmd->data_crc;
2716 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2717 tx_size += ISCSI_CRC_LEN;
2718
2719 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2720 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2721 }
2722
2723 cmd->iov_data_count = iov_count;
2724 cmd->tx_size = tx_size;
2725
6f3c0e69
AG		 2726 /* sendpage is preferred but can't insert markers */
2727 if (!conn->conn_ops->IFMarker)
2728 ret = iscsit_fe_sendpage_sg(cmd, conn);
2729 else
2730 ret = iscsit_send_tx_data(cmd, conn, 0);
2731
2732 iscsit_unmap_iovec(cmd);
2733
2734 if (ret < 0) {
2735 iscsit_tx_thread_wait_for_tcp(conn);
2736 return ret;
2737 }
2738
e48354ce 2739 if (dr->dr_complete) {
6f3c0e69 2740 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2741 2 : 1;
2742 iscsit_free_datain_req(cmd, dr);
2743 }
2744
6f3c0e69 2745 return eodr;
e48354ce
NB		 2746}
2747
2ec5a8c1
NB		 2748int
2749iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2750 struct iscsi_logout_rsp *hdr)
e48354ce 2751{
e48354ce
NB		 2752 struct iscsi_conn *logout_conn = NULL;
2753 struct iscsi_conn_recovery *cr = NULL;
2754 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2755 /*
2756 * The actual shutting down of Sessions and/or Connections
2757 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2758 * is done in scsi_logout_post_handler().
2759 */
2760 switch (cmd->logout_reason) {
2761 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2762 pr_debug("iSCSI session logout successful, setting"
2763 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2764 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2765 break;
2766 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2767 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2768 break;
2769 /*
2770 * For CLOSECONNECTION logout requests carrying
2771 * a matching logout CID -> local CID, the reference
2772 * for the local CID will have been incremented in
2773 * iscsi_logout_closeconnection().
2774 *
2775 * For CLOSECONNECTION logout requests carrying
2776 * a different CID than the connection it arrived
2777 * on, the connection responding to cmd->logout_cid
2778 * is stopped in iscsit_logout_post_handler_diffcid().
2779 */
2780
2781 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2782 " successful.\n", cmd->logout_cid, conn->cid);
2783 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2784 break;
2785 case ISCSI_LOGOUT_REASON_RECOVERY:
2786 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2787 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2788 break;
2789 /*
2790 * If the connection is still active from our point of view
2791 * force connection recovery to occur.
2792 */
2793 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2794 cmd->logout_cid);
ee1b1b9c 2795 if (logout_conn) {
e48354ce
NB		 2796 iscsit_connection_reinstatement_rcfr(logout_conn);
2797 iscsit_dec_conn_usage_count(logout_conn);
2798 }
2799
2800 cr = iscsit_get_inactive_connection_recovery_entry(
2801 conn->sess, cmd->logout_cid);
2802 if (!cr) {
2803 pr_err("Unable to locate CID: %hu for"
2804 " REMOVECONNFORRECOVERY Logout Request.\n",
2805 cmd->logout_cid);
2806 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2807 break;
2808 }
2809
2810 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2811
2812 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2813 " for recovery for CID: %hu on CID: %hu successful.\n",
2814 cmd->logout_cid, conn->cid);
2815 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2816 break;
2817 default:
2818 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2819 cmd->logout_reason);
2820 return -1;
2821 }
2822
e48354ce
NB		 2823 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2824 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2825 hdr->response = cmd->logout_response;
66c7db68 2826 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2827 cmd->stat_sn = conn->stat_sn++;
2828 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2829
2830 iscsit_increment_maxcmdsn(cmd, conn->sess);
2831 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2832 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2833
2ec5a8c1
NB		 2834 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2835 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2836 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2837 cmd->logout_cid, conn->cid);
2838
2839 return 0;
2840}
2841EXPORT_SYMBOL(iscsit_build_logout_rsp);
2842
2843static int
2844iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2845{
2846 struct kvec *iov;
2847 int niov = 0, tx_size, rc;
2848
2849 rc = iscsit_build_logout_rsp(cmd, conn,
2850 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2851 if (rc < 0)
2852 return rc;
2853
2854 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2855 iov = &cmd->iov_misc[0];
2856 iov[niov].iov_base = cmd->pdu;
2857 iov[niov++].iov_len = ISCSI_HDR_LEN;
2858
2859 if (conn->conn_ops->HeaderDigest) {
2860 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2861
80690fdb
GU		 2862 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2863 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2864
2865 iov[0].iov_len += ISCSI_CRC_LEN;
2866 tx_size += ISCSI_CRC_LEN;
2867 pr_debug("Attaching CRC32C HeaderDigest to"
2868 " Logout Response 0x%08x\n", *header_digest);
2869 }
2870 cmd->iov_misc_count = niov;
2871 cmd->tx_size = tx_size;
2872
e48354ce
NB		 2873 return 0;
2874}
2875
2ec5a8c1
NB		 2876void
2877iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2878 struct iscsi_nopin *hdr, bool nopout_response)
2879{
2880 hdr->opcode = ISCSI_OP_NOOP_IN;
2881 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2882 hton24(hdr->dlength, cmd->buf_ptr_size);
2883 if (nopout_response)
2884 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2885 hdr->itt = cmd->init_task_tag;
2886 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2887 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2888 conn->stat_sn;
2889 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2890
2891 if (nopout_response)
2892 iscsit_increment_maxcmdsn(cmd, conn->sess);
2893
2894 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2895 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2896
2897 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2898 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2899 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2900 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2901}
2902EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2903
e48354ce
NB		 2904/*
2905 * Unsolicited NOPIN, either requesting a response or not.
2906 */
2907static int iscsit_send_unsolicited_nopin(
2908 struct iscsi_cmd *cmd,
2909 struct iscsi_conn *conn,
2910 int want_response)
2911{
2ec5a8c1
NB		 2912 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2913 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2914
2ec5a8c1 2915 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2916
2917 if (conn->conn_ops->HeaderDigest) {
2918 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2919
80690fdb
GU		 2920 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2921 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2922
2923 tx_size += ISCSI_CRC_LEN;
2924 pr_debug("Attaching CRC32C HeaderDigest to"
2925 " NopIN 0x%08x\n", *header_digest);
2926 }
2927
2928 cmd->iov_misc[0].iov_base = cmd->pdu;
2929 cmd->iov_misc[0].iov_len = tx_size;
2930 cmd->iov_misc_count = 1;
2931 cmd->tx_size = tx_size;
2932
2933 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2934 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2935
6f3c0e69
AG		 2936 ret = iscsit_send_tx_data(cmd, conn, 1);
2937 if (ret < 0) {
2938 iscsit_tx_thread_wait_for_tcp(conn);
2939 return ret;
2940 }
2941
2942 spin_lock_bh(&cmd->istate_lock);
2943 cmd->i_state = want_response ?
2944 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2945 spin_unlock_bh(&cmd->istate_lock);
2946
e48354ce
NB		 2947 return 0;
2948}
2949
2ec5a8c1
NB		 2950static int
2951iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2952{
2ec5a8c1 2953 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2954 struct kvec *iov;
2ec5a8c1
NB		 2955 u32 padding = 0;
2956 int niov = 0, tx_size;
e48354ce 2957
2ec5a8c1 2958 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2959
2ec5a8c1 2960 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2961 iov = &cmd->iov_misc[0];
2962 iov[niov].iov_base = cmd->pdu;
2963 iov[niov++].iov_len = ISCSI_HDR_LEN;
2964
2965 if (conn->conn_ops->HeaderDigest) {
2966 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2967
80690fdb
GU		 2968 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2969 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2970
2971 iov[0].iov_len += ISCSI_CRC_LEN;
2972 tx_size += ISCSI_CRC_LEN;
2973 pr_debug("Attaching CRC32C HeaderDigest"
2974 " to NopIn 0x%08x\n", *header_digest);
2975 }
2976
2977 /*
2978 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2979 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2980 */
2981 if (cmd->buf_ptr_size) {
2982 iov[niov].iov_base = cmd->buf_ptr;
2983 iov[niov++].iov_len = cmd->buf_ptr_size;
2984 tx_size += cmd->buf_ptr_size;
2985
2986 pr_debug("Echoing back %u bytes of ping"
2987 " data.\n", cmd->buf_ptr_size);
2988
2989 padding = ((-cmd->buf_ptr_size) & 3);
2990 if (padding != 0) {
2991 iov[niov].iov_base = &cmd->pad_bytes;
2992 iov[niov++].iov_len = padding;
2993 tx_size += padding;
2994 pr_debug("Attaching %u additional"
2995 " padding bytes.\n", padding);
2996 }
2997 if (conn->conn_ops->DataDigest) {
2998 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2999 cmd->buf_ptr, cmd->buf_ptr_size,
3000 padding, (u8 *)&cmd->pad_bytes,
3001 (u8 *)&cmd->data_crc);
3002
3003 iov[niov].iov_base = &cmd->data_crc;
3004 iov[niov++].iov_len = ISCSI_CRC_LEN;
3005 tx_size += ISCSI_CRC_LEN;
3006 pr_debug("Attached DataDigest for %u"
3007 " bytes of ping data, CRC 0x%08x\n",
3008 cmd->buf_ptr_size, cmd->data_crc);
3009 }
3010 }
3011
3012 cmd->iov_misc_count = niov;
3013 cmd->tx_size = tx_size;
3014
e48354ce
NB		 3015 return 0;
3016}
3017
6f3c0e69 3018static int iscsit_send_r2t(
e48354ce
NB		 3019 struct iscsi_cmd *cmd,
3020 struct iscsi_conn *conn)
3021{
3022 int tx_size = 0;
3023 struct iscsi_r2t *r2t;
3024 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3025 int ret;
e48354ce
NB		 3026
3027 r2t = iscsit_get_r2t_from_list(cmd);
3028 if (!r2t)
3029 return -1;
3030
3031 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3032 memset(hdr, 0, ISCSI_HDR_LEN);
3033 hdr->opcode = ISCSI_OP_R2T;
3034 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3035 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3036 (struct scsi_lun *)&hdr->lun);
66c7db68 3037 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3038 spin_lock_bh(&conn->sess->ttt_lock);
3039 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3040 if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3041 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3042 spin_unlock_bh(&conn->sess->ttt_lock);
3043 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3044 hdr->statsn = cpu_to_be32(conn->stat_sn);
3045 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3046 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3047 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3048 hdr->data_offset = cpu_to_be32(r2t->offset);
3049 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3050
3051 cmd->iov_misc[0].iov_base = cmd->pdu;
3052 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3053 tx_size += ISCSI_HDR_LEN;
3054
3055 if (conn->conn_ops->HeaderDigest) {
3056 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3057
80690fdb
GU		 3058 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3059 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3060
3061 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3062 tx_size += ISCSI_CRC_LEN;
3063 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3064 " PDU 0x%08x\n", *header_digest);
3065 }
3066
3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071 r2t->offset, r2t->xfer_len, conn->cid);
3072
3073 cmd->iov_misc_count = 1;
3074 cmd->tx_size = tx_size;
3075
3076 spin_lock_bh(&cmd->r2t_lock);
3077 r2t->sent_r2t = 1;
3078 spin_unlock_bh(&cmd->r2t_lock);
3079
6f3c0e69
AG		 3080 ret = iscsit_send_tx_data(cmd, conn, 1);
3081 if (ret < 0) {
3082 iscsit_tx_thread_wait_for_tcp(conn);
3083 return ret;
3084 }
3085
3086 spin_lock_bh(&cmd->dataout_timeout_lock);
3087 iscsit_start_dataout_timer(cmd, conn);
3088 spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
e48354ce
NB		 3090 return 0;
3091}
3092
3093/*
8b1e1244
AG		 3094 * @recovery: If called from iscsi_task_reassign_complete_write() for
3095 * connection recovery.
e48354ce
NB		 3096 */
3097int iscsit_build_r2ts_for_cmd(
e48354ce 3098 struct iscsi_conn *conn,
3e1c81a9 3099 struct iscsi_cmd *cmd,
8b1e1244 3100 bool recovery)
e48354ce
NB		 3101{
3102 int first_r2t = 1;
3103 u32 offset = 0, xfer_len = 0;
3104
3105 spin_lock_bh(&cmd->r2t_lock);
3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107 spin_unlock_bh(&cmd->r2t_lock);
3108 return 0;
3109 }
3110
8b1e1244
AG		 3111 if (conn->sess->sess_ops->DataSequenceInOrder &&
3112 !recovery)
c6037cc5 3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3114
3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117 offset = cmd->r2t_offset;
3118
8b1e1244
AG		 3119 if (first_r2t && recovery) {
3120 int new_data_end = offset +
3121 conn->sess->sess_ops->MaxBurstLength -
3122 cmd->next_burst_len;
3123
ebf1d95c
AG		 3124 if (new_data_end > cmd->se_cmd.data_length)
3125 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3126 else
3127 xfer_len =
3128 conn->sess->sess_ops->MaxBurstLength -
3129 cmd->next_burst_len;
e48354ce 3130 } else {
8b1e1244
AG		 3131 int new_data_end = offset +
3132 conn->sess->sess_ops->MaxBurstLength;
3133
ebf1d95c
AG		 3134 if (new_data_end > cmd->se_cmd.data_length)
3135 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3136 else
3137 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3138 }
3139 cmd->r2t_offset += xfer_len;
3140
ebf1d95c 3141 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143 } else {
3144 struct iscsi_seq *seq;
3145
3146 seq = iscsit_get_seq_holder_for_r2t(cmd);
3147 if (!seq) {
3148 spin_unlock_bh(&cmd->r2t_lock);
3149 return -1;
3150 }
3151
3152 offset = seq->offset;
3153 xfer_len = seq->xfer_len;
3154
3155 if (cmd->seq_send_order == cmd->seq_count)
3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157 }
3158 cmd->outstanding_r2ts++;
3159 first_r2t = 0;
3160
3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162 spin_unlock_bh(&cmd->r2t_lock);
3163 return -1;
3164 }
3165
3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167 break;
3168 }
3169 spin_unlock_bh(&cmd->r2t_lock);
3170
3171 return 0;
3172}
3173
2ec5a8c1
NB		 3174void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3175 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3176{
2ec5a8c1 3177 if (inc_stat_sn)
e48354ce
NB		 3178 cmd->stat_sn = conn->stat_sn++;
3179
04f3b31b 3180 atomic_long_inc(&conn->sess->rsp_pdus);
e48354ce 3181
e48354ce
NB		 3182 memset(hdr, 0, ISCSI_HDR_LEN);
3183 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3184 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3185 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3186 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3188 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3189 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3190 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3191 }
3192 hdr->response = cmd->iscsi_response;
3193 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3194 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3195 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3196
3197 iscsit_increment_maxcmdsn(cmd, conn->sess);
3198 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3199 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3200
2ec5a8c1
NB		 3201 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3202 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3203 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3204 cmd->se_cmd.scsi_status, conn->cid);
3205}
3206EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3207
3208static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3209{
3210 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3211 struct kvec *iov;
3212 u32 padding = 0, tx_size = 0;
3213 int iov_count = 0;
3214 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3215
3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
e48354ce
NB		 3218 iov = &cmd->iov_misc[0];
3219 iov[iov_count].iov_base = cmd->pdu;
3220 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3221 tx_size += ISCSI_HDR_LEN;
3222
3223 /*
3224 * Attach SENSE DATA payload to iSCSI Response PDU
3225 */
3226 if (cmd->se_cmd.sense_buffer &&
3227 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3228 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3229 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3230 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3231
e48354ce 3232 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3233 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3234 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3235 iov[iov_count++].iov_len =
3236 (cmd->se_cmd.scsi_sense_length + padding);
3237 tx_size += cmd->se_cmd.scsi_sense_length;
3238
3239 if (padding) {
9c58b7dd 3240 memset(cmd->sense_buffer +
e48354ce
NB		 3241 cmd->se_cmd.scsi_sense_length, 0, padding);
3242 tx_size += padding;
3243 pr_debug("Adding %u bytes of padding to"
3244 " SENSE.\n", padding);
3245 }
3246
3247 if (conn->conn_ops->DataDigest) {
3248 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3249 cmd->sense_buffer,
e48354ce
NB		 3250 (cmd->se_cmd.scsi_sense_length + padding),
3251 0, NULL, (u8 *)&cmd->data_crc);
3252
3253 iov[iov_count].iov_base = &cmd->data_crc;
3254 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3255 tx_size += ISCSI_CRC_LEN;
3256
3257 pr_debug("Attaching CRC32 DataDigest for"
3258 " SENSE, %u bytes CRC 0x%08x\n",
3259 (cmd->se_cmd.scsi_sense_length + padding),
3260 cmd->data_crc);
3261 }
3262
3263 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3264 " Response PDU\n",
3265 cmd->se_cmd.scsi_sense_length);
3266 }
3267
3268 if (conn->conn_ops->HeaderDigest) {
3269 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3270
80690fdb
GU		 3271 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3272 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3273
3274 iov[0].iov_len += ISCSI_CRC_LEN;
3275 tx_size += ISCSI_CRC_LEN;
3276 pr_debug("Attaching CRC32 HeaderDigest for Response"
3277 " PDU 0x%08x\n", *header_digest);
3278 }
3279
3280 cmd->iov_misc_count = iov_count;
3281 cmd->tx_size = tx_size;
3282
e48354ce
NB		 3283 return 0;
3284}
3285
3286static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3287{
3288 switch (se_tmr->response) {
3289 case TMR_FUNCTION_COMPLETE:
3290 return ISCSI_TMF_RSP_COMPLETE;
3291 case TMR_TASK_DOES_NOT_EXIST:
3292 return ISCSI_TMF_RSP_NO_TASK;
3293 case TMR_LUN_DOES_NOT_EXIST:
3294 return ISCSI_TMF_RSP_NO_LUN;
3295 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3296 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3297 case TMR_FUNCTION_REJECTED:
3298 default:
3299 return ISCSI_TMF_RSP_REJECTED;
3300 }
3301}
3302
2ec5a8c1
NB		 3303void
3304iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3305 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3306{
3307 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3308
e48354ce 3309 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3310 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3311 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3312 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3313 cmd->stat_sn = conn->stat_sn++;
3314 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3315
3316 iscsit_increment_maxcmdsn(cmd, conn->sess);
3317 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3318 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3319
2ec5a8c1
NB		 3320 pr_debug("Built Task Management Response ITT: 0x%08x,"
3321 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3322 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3323}
3324EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3325
3326static int
3327iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3328{
3329 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3330 u32 tx_size = 0;
3331
3332 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3333
e48354ce
NB		 3334 cmd->iov_misc[0].iov_base = cmd->pdu;
3335 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3336 tx_size += ISCSI_HDR_LEN;
3337
3338 if (conn->conn_ops->HeaderDigest) {
3339 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3340
80690fdb
GU		 3341 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3342 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3343
3344 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3345 tx_size += ISCSI_CRC_LEN;
3346 pr_debug("Attaching CRC32 HeaderDigest for Task"
3347 " Mgmt Response PDU 0x%08x\n", *header_digest);
3348 }
3349
3350 cmd->iov_misc_count = 1;
3351 cmd->tx_size = tx_size;
3352
e48354ce
NB		 3353 return 0;
3354}
3355
2f9bc894
NB		 3356static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3357{
3358 bool ret = false;
3359
3360 if (np->np_sockaddr.ss_family == AF_INET6) {
3361 const struct sockaddr_in6 sin6 = {
3362 .sin6_addr = IN6ADDR_ANY_INIT };
3363 struct sockaddr_in6 *sock_in6 =
3364 (struct sockaddr_in6 *)&np->np_sockaddr;
3365
3366 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3367 sin6.sin6_addr.s6_addr, 16))
3368 ret = true;
3369 } else {
3370 struct sockaddr_in * sock_in =
3371 (struct sockaddr_in *)&np->np_sockaddr;
3372
cea0b4ce 3373 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3374 ret = true;
3375 }
3376
3377 return ret;
3378}
3379
8b1e1244
AG		 3380#define SENDTARGETS_BUF_LIMIT 32768U
3381
e48354ce
NB		 3382static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3383{
3384 char *payload = NULL;
3385 struct iscsi_conn *conn = cmd->conn;
3386 struct iscsi_portal_group *tpg;
3387 struct iscsi_tiqn *tiqn;
3388 struct iscsi_tpg_np *tpg_np;
3389 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3390 int target_name_printed;
8b1e1244 3391 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3392 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
e48354ce 3393
8b1e1244
AG		 3394 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3395 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3396
3397 payload = kzalloc(buffer_len, GFP_KERNEL);
3398 if (!payload) {
3399 pr_err("Unable to allocate memory for sendtargets"
3400 " response.\n");
3401 return -ENOMEM;
3402 }
6665889c
NB		 3403 /*
3404 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3405 * explicit case..
3406 */
3407 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3408 text_ptr = strchr(text_in, '=');
3409 if (!text_ptr) {
3410 pr_err("Unable to locate '=' string in text_in:"
3411 " %s\n", text_in);
4f45d320 3412 kfree(payload);
6665889c
NB		 3413 return -EINVAL;
3414 }
3415 /*
3416 * Skip over '=' character..
3417 */
3418 text_ptr += 1;
3419 }
e48354ce
NB		 3420
3421 spin_lock(&tiqn_lock);
3422 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
6665889c
NB		 3423 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3424 strcmp(tiqn->tiqn, text_ptr)) {
3425 continue;
3426 }
3427
2dd1d53f 3428 target_name_printed = 0;
e48354ce
NB		 3429
3430 spin_lock(&tiqn->tiqn_tpg_lock);
3431 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3432
2dd1d53f
TG		 3433 /* If demo_mode_discovery=0 and generate_node_acls=0
3434 * (demo mode dislabed) do not return
3435 * TargetName+TargetAddress unless a NodeACL exists.
3436 */
3437
3438 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3439 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3440 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3441 cmd->conn->sess->sess_ops->InitiatorName))) {
3442 continue;
3443 }
3444
e48354ce
NB		 3445 spin_lock(&tpg->tpg_state_lock);
3446 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3447 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3448 spin_unlock(&tpg->tpg_state_lock);
3449 continue;
3450 }
3451 spin_unlock(&tpg->tpg_state_lock);
3452
3453 spin_lock(&tpg->tpg_np_lock);
3454 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3455 tpg_np_list) {
2f9bc894
NB		 3456 struct iscsi_np *np = tpg_np->tpg_np;
3457 bool inaddr_any = iscsit_check_inaddr_any(np);
3458
2dd1d53f
TG		 3459 if (!target_name_printed) {
3460 len = sprintf(buf, "TargetName=%s",
3461 tiqn->tiqn);
3462 len += 1;
3463
3464 if ((len + payload_len) > buffer_len) {
3465 spin_unlock(&tpg->tpg_np_lock);
3466 spin_unlock(&tiqn->tiqn_tpg_lock);
3467 end_of_buf = 1;
3468 goto eob;
3469 }
3470 memcpy(payload + payload_len, buf, len);
3471 payload_len += len;
3472 target_name_printed = 1;
3473 }
3474
e48354ce 3475 len = sprintf(buf, "TargetAddress="
dfecf611
CL		 3476 "%s:%hu,%hu",
3477 (inaddr_any == false) ?
2f9bc894 3478 np->np_ip : conn->local_ip,
dfecf611 3479 (inaddr_any == false) ?
2f9bc894 3480 np->np_port : conn->local_port,
e48354ce
NB		 3481 tpg->tpgt);
3482 len += 1;
3483
3484 if ((len + payload_len) > buffer_len) {
3485 spin_unlock(&tpg->tpg_np_lock);
3486 spin_unlock(&tiqn->tiqn_tpg_lock);
3487 end_of_buf = 1;
3488 goto eob;
3489 }
8359cf43 3490 memcpy(payload + payload_len, buf, len);
e48354ce
NB		 3491 payload_len += len;
3492 }
3493 spin_unlock(&tpg->tpg_np_lock);
3494 }
3495 spin_unlock(&tiqn->tiqn_tpg_lock);
3496eob:
3497 if (end_of_buf)
3498 break;
6665889c
NB		 3499
3500 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3501 break;
e48354ce
NB		 3502 }
3503 spin_unlock(&tiqn_lock);
3504
3505 cmd->buf_ptr = payload;
3506
3507 return payload_len;
3508}
3509
889c8a68
NB		 3510int
3511iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3512 struct iscsi_text_rsp *hdr)
e48354ce 3513{
889c8a68 3514 int text_length, padding;
e48354ce
NB		 3515
3516 text_length = iscsit_build_sendtargets_response(cmd);
3517 if (text_length < 0)
3518 return text_length;
3519
889c8a68
NB		 3520 hdr->opcode = ISCSI_OP_TEXT_RSP;
3521 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
e48354ce 3522 padding = ((-text_length) & 3);
e48354ce 3523 hton24(hdr->dlength, text_length);
889c8a68
NB		 3524 hdr->itt = cmd->init_task_tag;
3525 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3526 cmd->stat_sn = conn->stat_sn++;
3527 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3528
3529 iscsit_increment_maxcmdsn(cmd, conn->sess);
889c8a68
NB		 3530 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3531 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
e48354ce 3532
889c8a68
NB		 3533 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3534 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3535 text_length, conn->cid);
3536
3537 return text_length + padding;
3538}
3539EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3540
889c8a68
NB		 3541/*
3542 * FIXME: Add support for F_BIT and C_BIT when the length is longer than
3543 * MaxRecvDataSegmentLength.
3544 */
3545static int iscsit_send_text_rsp(
3546 struct iscsi_cmd *cmd,
3547 struct iscsi_conn *conn)
3548{
3549 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3550 struct kvec *iov;
3551 u32 tx_size = 0;
3552 int text_length, iov_count = 0, rc;
3553
3554 rc = iscsit_build_text_rsp(cmd, conn, hdr);
3555 if (rc < 0)
3556 return rc;
3557
3558 text_length = rc;
3559 iov = &cmd->iov_misc[0];
e48354ce
NB		 3560 iov[iov_count].iov_base = cmd->pdu;
3561 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3562 iov[iov_count].iov_base = cmd->buf_ptr;
889c8a68 3563 iov[iov_count++].iov_len = text_length;
e48354ce 3564
889c8a68 3565 tx_size += (ISCSI_HDR_LEN + text_length);
e48354ce
NB		 3566
3567 if (conn->conn_ops->HeaderDigest) {
3568 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3569
80690fdb
GU		 3570 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3571 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3572
3573 iov[0].iov_len += ISCSI_CRC_LEN;
3574 tx_size += ISCSI_CRC_LEN;
3575 pr_debug("Attaching CRC32 HeaderDigest for"
3576 " Text Response PDU 0x%08x\n", *header_digest);
3577 }
3578
3579 if (conn->conn_ops->DataDigest) {
3580 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
889c8a68 3581 cmd->buf_ptr, text_length,
e48354ce
NB		 3582 0, NULL, (u8 *)&cmd->data_crc);
3583
3584 iov[iov_count].iov_base = &cmd->data_crc;
3585 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3586 tx_size += ISCSI_CRC_LEN;
3587
3588 pr_debug("Attaching DataDigest for %u bytes of text"
889c8a68 3589 " data, CRC 0x%08x\n", text_length,
e48354ce
NB		 3590 cmd->data_crc);
3591 }
3592
3593 cmd->iov_misc_count = iov_count;
3594 cmd->tx_size = tx_size;
3595
e48354ce
NB		 3596 return 0;
3597}
3598
2ec5a8c1
NB		 3599void
3600iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3601 struct iscsi_reject *hdr)
3602{
3603 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3604 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3605 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3606 hton24(hdr->dlength, ISCSI_HDR_LEN);
3607 hdr->ffffffff = cpu_to_be32(0xffffffff);
3608 cmd->stat_sn = conn->stat_sn++;
3609 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3610 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3611 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3612
3613}
3614EXPORT_SYMBOL(iscsit_build_reject);
3615
e48354ce
NB		 3616static int iscsit_send_reject(
3617 struct iscsi_cmd *cmd,
3618 struct iscsi_conn *conn)
3619{
bfbdb31d 3620 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3621 struct kvec *iov;
bfbdb31d 3622 u32 iov_count = 0, tx_size;
e48354ce 3623
bfbdb31d 3624 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3625
3626 iov = &cmd->iov_misc[0];
e48354ce
NB		 3627 iov[iov_count].iov_base = cmd->pdu;
3628 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3629 iov[iov_count].iov_base = cmd->buf_ptr;
3630 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3631
3632 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3633
3634 if (conn->conn_ops->HeaderDigest) {
3635 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3636
80690fdb
GU		 3637 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3638 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3639
3640 iov[0].iov_len += ISCSI_CRC_LEN;
3641 tx_size += ISCSI_CRC_LEN;
3642 pr_debug("Attaching CRC32 HeaderDigest for"
3643 " REJECT PDU 0x%08x\n", *header_digest);
3644 }
3645
3646 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3647 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3648 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3649
3650 iov[iov_count].iov_base = &cmd->data_crc;
3651 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3652 tx_size += ISCSI_CRC_LEN;
3653 pr_debug("Attaching CRC32 DataDigest for REJECT"
3654 " PDU 0x%08x\n", cmd->data_crc);
3655 }
3656
3657 cmd->iov_misc_count = iov_count;
3658 cmd->tx_size = tx_size;
3659
3660 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3661 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3662
3663 return 0;
3664}
3665
e48354ce
NB		 3666void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3667{
3668 struct iscsi_thread_set *ts = conn->thread_set;
3669 int ord, cpu;
3670 /*
3671 * thread_id is assigned from iscsit_global->ts_bitmap from
3672 * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3673 *
3674 * Here we use thread_id to determine which CPU that this
3675 * iSCSI connection's iscsi_thread_set will be scheduled to
3676 * execute upon.
3677 */
3678 ord = ts->thread_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3679 for_each_online_cpu(cpu) {
3680 if (ord-- == 0) {
3681 cpumask_set_cpu(cpu, conn->conn_cpumask);
3682 return;
3683 }
3684 }
3685 /*
3686 * This should never be reached..
3687 */
3688 dump_stack();
3689 cpumask_setall(conn->conn_cpumask);
3690}
3691
3692static inline void iscsit_thread_check_cpumask(
3693 struct iscsi_conn *conn,
3694 struct task_struct *p,
3695 int mode)
3696{
3697 char buf[128];
3698 /*
3699 * mode == 1 signals iscsi_target_tx_thread() usage.
3700 * mode == 0 signals iscsi_target_rx_thread() usage.
3701 */
3702 if (mode == 1) {
3703 if (!conn->conn_tx_reset_cpumask)
3704 return;
3705 conn->conn_tx_reset_cpumask = 0;
3706 } else {
3707 if (!conn->conn_rx_reset_cpumask)
3708 return;
3709 conn->conn_rx_reset_cpumask = 0;
3710 }
3711 /*
3712 * Update the CPU mask for this single kthread so that
3713 * both TX and RX kthreads are scheduled to run on the
3714 * same CPU.
3715 */
3716 memset(buf, 0, 128);
3717 cpumask_scnprintf(buf, 128, conn->conn_cpumask);
e48354ce
NB		 3718 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3719}
3720
2ec5a8c1
NB		 3721static int
3722iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3723{
6f3c0e69
AG		 3724 int ret;
3725
2ec5a8c1
NB		 3726 switch (state) {
3727 case ISTATE_SEND_R2T:
3728 ret = iscsit_send_r2t(cmd, conn);
3729 if (ret < 0)
3730 goto err;
3731 break;
3732 case ISTATE_REMOVE:
3733 spin_lock_bh(&conn->cmd_lock);
5159d763 3734 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3735 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3736
aafc9d15 3737 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3738 break;
3739 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3740 iscsit_mod_nopin_response_timer(conn);
3741 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3742 if (ret < 0)
6f3c0e69 3743 goto err;
2ec5a8c1
NB		 3744 break;
3745 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3746 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3747 if (ret < 0)
3748 goto err;
3749 break;
3750 default:
3751 pr_err("Unknown Opcode: 0x%02x ITT:"
3752 " 0x%08x, i_state: %d on CID: %hu\n",
3753 cmd->iscsi_opcode, cmd->init_task_tag, state,
3754 conn->cid);
3755 goto err;
6f3c0e69
AG		 3756 }
3757
3758 return 0;
3759
3760err:
3761 return -1;
3762}
3763
2ec5a8c1
NB		 3764static int
3765iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3766{
2ec5a8c1 3767 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3768 struct iscsi_queue_req *qr;
3769 struct iscsi_cmd *cmd;
3770 u8 state;
3771 int ret;
3772
2ec5a8c1
NB		 3773 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3774 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3775 cmd = qr->cmd;
3776 state = qr->state;
3777 kmem_cache_free(lio_qr_cache, qr);
3778
2ec5a8c1
NB		 3779 ret = t->iscsit_immediate_queue(conn, cmd, state);
3780 if (ret < 0)
3781 return ret;
3782 }
fd3a9025 3783
2ec5a8c1
NB		 3784 return 0;
3785}
6f3c0e69 3786
2ec5a8c1
NB		 3787static int
3788iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3789{
3790 int ret;
3791
3792check_rsp_state:
3793 switch (state) {
3794 case ISTATE_SEND_DATAIN:
3795 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3796 if (ret < 0)
3797 goto err;
2ec5a8c1
NB		 3798 else if (!ret)
3799 /* more drs */
3800 goto check_rsp_state;
3801 else if (ret == 1) {
3802 /* all done */
3803 spin_lock_bh(&cmd->istate_lock);
3804 cmd->i_state = ISTATE_SENT_STATUS;
3805 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3806
2ec5a8c1
NB		 3807 if (atomic_read(&conn->check_immediate_queue))
3808 return 1;
6f3c0e69 3809
2ec5a8c1
NB		 3810 return 0;
3811 } else if (ret == 2) {
3812 /* Still must send status,
3813 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3814 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3815 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3816 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3817 state = ISTATE_SEND_STATUS;
3818 goto check_rsp_state;
3819 }
3820
3821 break;
3822 case ISTATE_SEND_STATUS:
3823 case ISTATE_SEND_STATUS_RECOVERY:
3824 ret = iscsit_send_response(cmd, conn);
3825 break;
3826 case ISTATE_SEND_LOGOUTRSP:
3827 ret = iscsit_send_logout(cmd, conn);
3828 break;
3829 case ISTATE_SEND_ASYNCMSG:
3830 ret = iscsit_send_conn_drop_async_message(
3831 cmd, conn);
3832 break;
3833 case ISTATE_SEND_NOPIN:
3834 ret = iscsit_send_nopin(cmd, conn);
3835 break;
3836 case ISTATE_SEND_REJECT:
3837 ret = iscsit_send_reject(cmd, conn);
3838 break;
3839 case ISTATE_SEND_TASKMGTRSP:
3840 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3841 if (ret != 0)
6f3c0e69 3842 break;
2ec5a8c1
NB		 3843 ret = iscsit_tmr_post_handler(cmd, conn);
3844 if (ret != 0)
3845 iscsit_fall_back_to_erl0(conn->sess);
3846 break;
3847 case ISTATE_SEND_TEXTRSP:
3848 ret = iscsit_send_text_rsp(cmd, conn);
3849 break;
3850 default:
3851 pr_err("Unknown Opcode: 0x%02x ITT:"
3852 " 0x%08x, i_state: %d on CID: %hu\n",
3853 cmd->iscsi_opcode, cmd->init_task_tag,
3854 state, conn->cid);
3855 goto err;
3856 }
3857 if (ret < 0)
3858 goto err;
3859
3860 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3861 iscsit_tx_thread_wait_for_tcp(conn);
3862 iscsit_unmap_iovec(cmd);
3863 goto err;
3864 }
3865 iscsit_unmap_iovec(cmd);
3866
3867 switch (state) {
3868 case ISTATE_SEND_LOGOUTRSP:
3869 if (!iscsit_logout_post_handler(cmd, conn))
3870 goto restart;
3871 /* fall through */
3872 case ISTATE_SEND_STATUS:
3873 case ISTATE_SEND_ASYNCMSG:
3874 case ISTATE_SEND_NOPIN:
3875 case ISTATE_SEND_STATUS_RECOVERY:
3876 case ISTATE_SEND_TEXTRSP:
3877 case ISTATE_SEND_TASKMGTRSP:
ba159914 3878 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3879 spin_lock_bh(&cmd->istate_lock);
3880 cmd->i_state = ISTATE_SENT_STATUS;
3881 spin_unlock_bh(&cmd->istate_lock);
3882 break;
2ec5a8c1
NB		 3883 default:
3884 pr_err("Unknown Opcode: 0x%02x ITT:"
3885 " 0x%08x, i_state: %d on CID: %hu\n",
3886 cmd->iscsi_opcode, cmd->init_task_tag,
3887 cmd->i_state, conn->cid);
3888 goto err;
6f3c0e69
AG		 3889 }
3890
2ec5a8c1
NB		 3891 if (atomic_read(&conn->check_immediate_queue))
3892 return 1;
3893
6f3c0e69
AG		 3894 return 0;
3895
3896err:
3897 return -1;
3898restart:
3899 return -EAGAIN;
3900}
3901
2ec5a8c1
NB		 3902static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3903{
3904 struct iscsit_transport *t = conn->conn_transport;
3905 struct iscsi_queue_req *qr;
3906 struct iscsi_cmd *cmd;
3907 u8 state;
3908 int ret;
3909
3910 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3911 cmd = qr->cmd;
3912 state = qr->state;
3913 kmem_cache_free(lio_qr_cache, qr);
3914
3915 ret = t->iscsit_response_queue(conn, cmd, state);
3916 if (ret == 1 || ret < 0)
3917 return ret;
3918 }
3919
3920 return 0;
3921}
3922
6f3c0e69
AG		 3923int iscsi_target_tx_thread(void *arg)
3924{
e48354ce 3925 int ret = 0;
e48354ce 3926 struct iscsi_conn *conn;
8359cf43 3927 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 3928 /*
3929 * Allow ourselves to be interrupted by SIGINT so that a
3930 * connection recovery / failure event can be triggered externally.
3931 */
3932 allow_signal(SIGINT);
3933
3934restart:
3935 conn = iscsi_tx_thread_pre_handler(ts);
3936 if (!conn)
3937 goto out;
3938
6f3c0e69 3939 ret = 0;
e48354ce
NB		 3940
3941 while (!kthread_should_stop()) {
3942 /*
3943 * Ensure that both TX and RX per connection kthreads
3944 * are scheduled to run on the same CPU.
3945 */
3946 iscsit_thread_check_cpumask(conn, current, 1);
3947
d5627acb
RD		 3948 wait_event_interruptible(conn->queues_wq,
3949 !iscsit_conn_all_queues_empty(conn) ||
3950 ts->status == ISCSI_THREAD_SET_RESET);
e48354ce
NB		 3951
3952 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3953 signal_pending(current))
3954 goto transport_err;
3955
fd3a9025 3956get_immediate:
2ec5a8c1 3957 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3958 if (ret < 0)
3959 goto transport_err;
e48354ce 3960
2ec5a8c1 3961 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3962 if (ret == 1)
3963 goto get_immediate;
3964 else if (ret == -EAGAIN)
6f3c0e69
AG		 3965 goto restart;
3966 else if (ret < 0)
3967 goto transport_err;
e48354ce
NB		 3968 }
3969
3970transport_err:
3971 iscsit_take_action_for_connection_exit(conn);
3972 goto restart;
3973out:
3974 return 0;
3975}
3976
3e1c81a9
NB		 3977static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3978{
3979 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3980 struct iscsi_cmd *cmd;
3981 int ret = 0;
3982
3983 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3984 case ISCSI_OP_SCSI_CMD:
676687c6 3985 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3986 if (!cmd)
ba159914 3987 goto reject;
3e1c81a9
NB		 3988
3989 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3990 break;
3991 case ISCSI_OP_SCSI_DATA_OUT:
3992 ret = iscsit_handle_data_out(conn, buf);
3993 break;
3994 case ISCSI_OP_NOOP_OUT:
3995 cmd = NULL;
3996 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
676687c6 3997 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3998 if (!cmd)
ba159914 3999 goto reject;
3e1c81a9
NB		 4000 }
4001 ret = iscsit_handle_nop_out(conn, cmd, buf);
4002 break;
4003 case ISCSI_OP_SCSI_TMFUNC:
676687c6 4004 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4005 if (!cmd)
ba159914 4006 goto reject;
3e1c81a9
NB		 4007
4008 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4009 break;
4010 case ISCSI_OP_TEXT:
676687c6 4011 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
64534aa7 4012 if (!cmd)
ba159914 4013 goto reject;
64534aa7
NB		 4014
4015 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 4016 break;
4017 case ISCSI_OP_LOGOUT:
676687c6 4018 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4019 if (!cmd)
ba159914 4020 goto reject;
3e1c81a9
NB		 4021
4022 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4023 if (ret > 0)
4024 wait_for_completion_timeout(&conn->conn_logout_comp,
4025 SECONDS_FOR_LOGOUT_COMP * HZ);
4026 break;
4027 case ISCSI_OP_SNACK:
4028 ret = iscsit_handle_snack(conn, buf);
4029 break;
4030 default:
4031 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4032 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4033 pr_err("Cannot recover from unknown"
4034 " opcode while ERL=0, closing iSCSI connection.\n");
4035 return -1;
4036 }
4037 if (!conn->conn_ops->OFMarker) {
4038 pr_err("Unable to recover from unknown"
4039 " opcode while OFMarker=No, closing iSCSI"
4040 " connection.\n");
4041 return -1;
4042 }
4043 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4044 pr_err("Unable to recover from unknown"
4045 " opcode, closing iSCSI connection.\n");
4046 return -1;
4047 }
4048 break;
4049 }
4050
4051 return ret;
ba159914
NB		 4052reject:
4053 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 4054}
4055
e48354ce
NB		 4056int iscsi_target_rx_thread(void *arg)
4057{
4058 int ret;
4059 u8 buffer[ISCSI_HDR_LEN], opcode;
4060 u32 checksum = 0, digest = 0;
4061 struct iscsi_conn *conn = NULL;
8359cf43 4062 struct iscsi_thread_set *ts = arg;
e48354ce
NB		 4063 struct kvec iov;
4064 /*
4065 * Allow ourselves to be interrupted by SIGINT so that a
4066 * connection recovery / failure event can be triggered externally.
4067 */
4068 allow_signal(SIGINT);
4069
4070restart:
4071 conn = iscsi_rx_thread_pre_handler(ts);
4072 if (!conn)
4073 goto out;
4074
3e1c81a9
NB		 4075 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4076 struct completion comp;
4077 int rc;
4078
4079 init_completion(&comp);
4080 rc = wait_for_completion_interruptible(&comp);
4081 if (rc < 0)
4082 goto transport_err;
4083
4084 goto out;
4085 }
4086
e48354ce
NB		 4087 while (!kthread_should_stop()) {
4088 /*
4089 * Ensure that both TX and RX per connection kthreads
4090 * are scheduled to run on the same CPU.
4091 */
4092 iscsit_thread_check_cpumask(conn, current, 0);
4093
4094 memset(buffer, 0, ISCSI_HDR_LEN);
4095 memset(&iov, 0, sizeof(struct kvec));
4096
4097 iov.iov_base = buffer;
4098 iov.iov_len = ISCSI_HDR_LEN;
4099
4100 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4101 if (ret != ISCSI_HDR_LEN) {
4102 iscsit_rx_thread_wait_for_tcp(conn);
4103 goto transport_err;
4104 }
4105
e48354ce
NB		 4106 if (conn->conn_ops->HeaderDigest) {
4107 iov.iov_base = &digest;
4108 iov.iov_len = ISCSI_CRC_LEN;
4109
4110 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4111 if (ret != ISCSI_CRC_LEN) {
4112 iscsit_rx_thread_wait_for_tcp(conn);
4113 goto transport_err;
4114 }
4115
4116 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4117 buffer, ISCSI_HDR_LEN,
4118 0, NULL, (u8 *)&checksum);
4119
4120 if (digest != checksum) {
4121 pr_err("HeaderDigest CRC32C failed,"
4122 " received 0x%08x, computed 0x%08x\n",
4123 digest, checksum);
4124 /*
4125 * Set the PDU to 0xff so it will intentionally
4126 * hit default in the switch below.
4127 */
4128 memset(buffer, 0xff, ISCSI_HDR_LEN);
04f3b31b 4129 atomic_long_inc(&conn->sess->conn_digest_errors);
e48354ce
NB		 4130 } else {
4131 pr_debug("Got HeaderDigest CRC32C"
4132 " 0x%08x\n", checksum);
4133 }
4134 }
4135
4136 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4137 goto transport_err;
4138
4139 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4140
4141 if (conn->sess->sess_ops->SessionType &&
4142 ((!(opcode & ISCSI_OP_TEXT)) ||
4143 (!(opcode & ISCSI_OP_LOGOUT)))) {
4144 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4145 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4146 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4147 buffer);
e48354ce
NB		 4148 goto transport_err;
4149 }
4150
3e1c81a9
NB		 4151 ret = iscsi_target_rx_opcode(conn, buffer);
4152 if (ret < 0)
4153 goto transport_err;
e48354ce
NB		 4154 }
4155
4156transport_err:
4157 if (!signal_pending(current))
4158 atomic_set(&conn->transport_failed, 1);
4159 iscsit_take_action_for_connection_exit(conn);
4160 goto restart;
4161out:
4162 return 0;
4163}
4164
4165static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4166{
4167 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4168 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4169 /*
4170 * We expect this function to only ever be called from either RX or TX
4171 * thread context via iscsit_close_connection() once the other context
4172 * has been reset -> returned sleeping pre-handler state.
4173 */
4174 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4175 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4176
5159d763 4177 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4178 spin_unlock_bh(&conn->cmd_lock);
4179
4180 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4181
aafc9d15 4182 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4183
4184 spin_lock_bh(&conn->cmd_lock);
4185 }
4186 spin_unlock_bh(&conn->cmd_lock);
4187}
4188
4189static void iscsit_stop_timers_for_cmds(
4190 struct iscsi_conn *conn)
4191{
4192 struct iscsi_cmd *cmd;
4193
4194 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4195 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4196 if (cmd->data_direction == DMA_TO_DEVICE)
4197 iscsit_stop_dataout_timer(cmd);
4198 }
4199 spin_unlock_bh(&conn->cmd_lock);
4200}
4201
4202int iscsit_close_connection(
4203 struct iscsi_conn *conn)
4204{
4205 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4206 struct iscsi_session *sess = conn->sess;
4207
4208 pr_debug("Closing iSCSI connection CID %hu on SID:"
4209 " %u\n", conn->cid, sess->sid);
4210 /*
4211 * Always up conn_logout_comp just in case the RX Thread is sleeping
4212 * and the logout response never got sent because the connection
4213 * failed.
4214 */
4215 complete(&conn->conn_logout_comp);
4216
4217 iscsi_release_thread_set(conn);
4218
4219 iscsit_stop_timers_for_cmds(conn);
4220 iscsit_stop_nopin_response_timer(conn);
4221 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4222
4223 if (conn->conn_transport->iscsit_wait_conn)
4224 conn->conn_transport->iscsit_wait_conn(conn);
4225
e48354ce
NB		 4226 iscsit_free_queue_reqs_for_conn(conn);
4227
4228 /*
4229 * During Connection recovery drop unacknowledged out of order
4230 * commands for this connection, and prepare the other commands
4231 * for realligence.
4232 *
4233 * During normal operation clear the out of order commands (but
4234 * do not free the struct iscsi_ooo_cmdsn's) and release all
4235 * struct iscsi_cmds.
4236 */
4237 if (atomic_read(&conn->connection_recovery)) {
4238 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4239 iscsit_prepare_cmds_for_realligance(conn);
4240 } else {
4241 iscsit_clear_ooo_cmdsns_for_conn(conn);
4242 iscsit_release_commands_from_conn(conn);
4243 }
4244
4245 /*
4246 * Handle decrementing session or connection usage count if
4247 * a logout response was not able to be sent because the
4248 * connection failed. Fall back to Session Recovery here.
4249 */
4250 if (atomic_read(&conn->conn_logout_remove)) {
4251 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4252 iscsit_dec_conn_usage_count(conn);
4253 iscsit_dec_session_usage_count(sess);
4254 }
4255 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4256 iscsit_dec_conn_usage_count(conn);
4257
4258 atomic_set(&conn->conn_logout_remove, 0);
4259 atomic_set(&sess->session_reinstatement, 0);
4260 atomic_set(&sess->session_fall_back_to_erl0, 1);
4261 }
4262
4263 spin_lock_bh(&sess->conn_lock);
4264 list_del(&conn->conn_list);
4265
4266 /*
4267 * Attempt to let the Initiator know this connection failed by
4268 * sending an Connection Dropped Async Message on another
4269 * active connection.
4270 */
4271 if (atomic_read(&conn->connection_recovery))
4272 iscsit_build_conn_drop_async_message(conn);
4273
4274 spin_unlock_bh(&sess->conn_lock);
4275
4276 /*
4277 * If connection reinstatement is being performed on this connection,
4278 * up the connection reinstatement semaphore that is being blocked on
4279 * in iscsit_cause_connection_reinstatement().
4280 */
4281 spin_lock_bh(&conn->state_lock);
4282 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4283 spin_unlock_bh(&conn->state_lock);
4284 complete(&conn->conn_wait_comp);
4285 wait_for_completion(&conn->conn_post_wait_comp);
4286 spin_lock_bh(&conn->state_lock);
4287 }
4288
4289 /*
4290 * If connection reinstatement is being performed on this connection
4291 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4292 * connection wait rcfr semaphore that is being blocked on
4293 * an iscsit_connection_reinstatement_rcfr().
4294 */
4295 if (atomic_read(&conn->connection_wait_rcfr)) {
4296 spin_unlock_bh(&conn->state_lock);
4297 complete(&conn->conn_wait_rcfr_comp);
4298 wait_for_completion(&conn->conn_post_wait_comp);
4299 spin_lock_bh(&conn->state_lock);
4300 }
4301 atomic_set(&conn->connection_reinstatement, 1);
4302 spin_unlock_bh(&conn->state_lock);
4303
4304 /*
4305 * If any other processes are accessing this connection pointer we
4306 * must wait until they have completed.
4307 */
4308 iscsit_check_conn_usage_count(conn);
4309
4310 if (conn->conn_rx_hash.tfm)
4311 crypto_free_hash(conn->conn_rx_hash.tfm);
4312 if (conn->conn_tx_hash.tfm)
4313 crypto_free_hash(conn->conn_tx_hash.tfm);
4314
4315 if (conn->conn_cpumask)
4316 free_cpumask_var(conn->conn_cpumask);
4317
4318 kfree(conn->conn_ops);
4319 conn->conn_ops = NULL;
4320
bf6932f4 4321 if (conn->sock)
e48354ce 4322 sock_release(conn->sock);
baa4d64b
NB		 4323
4324 if (conn->conn_transport->iscsit_free_conn)
4325 conn->conn_transport->iscsit_free_conn(conn);
4326
4327 iscsit_put_transport(conn->conn_transport);
4328
e48354ce
NB		 4329 conn->thread_set = NULL;
4330
4331 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4332 conn->conn_state = TARG_CONN_STATE_FREE;
4333 kfree(conn);
4334
4335 spin_lock_bh(&sess->conn_lock);
4336 atomic_dec(&sess->nconn);
4337 pr_debug("Decremented iSCSI connection count to %hu from node:"
4338 " %s\n", atomic_read(&sess->nconn),
4339 sess->sess_ops->InitiatorName);
4340 /*
4341 * Make sure that if one connection fails in an non ERL=2 iSCSI
4342 * Session that they all fail.
4343 */
4344 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4345 !atomic_read(&sess->session_logout))
4346 atomic_set(&sess->session_fall_back_to_erl0, 1);
4347
4348 /*
4349 * If this was not the last connection in the session, and we are
4350 * performing session reinstatement or falling back to ERL=0, call
4351 * iscsit_stop_session() without sleeping to shutdown the other
4352 * active connections.
4353 */
4354 if (atomic_read(&sess->nconn)) {
4355 if (!atomic_read(&sess->session_reinstatement) &&
4356 !atomic_read(&sess->session_fall_back_to_erl0)) {
4357 spin_unlock_bh(&sess->conn_lock);
4358 return 0;
4359 }
4360 if (!atomic_read(&sess->session_stop_active)) {
4361 atomic_set(&sess->session_stop_active, 1);
4362 spin_unlock_bh(&sess->conn_lock);
4363 iscsit_stop_session(sess, 0, 0);
4364 return 0;
4365 }
4366 spin_unlock_bh(&sess->conn_lock);
4367 return 0;
4368 }
4369
4370 /*
4371 * If this was the last connection in the session and one of the
4372 * following is occurring:
4373 *
4374 * Session Reinstatement is not being performed, and are falling back
4375 * to ERL=0 call iscsit_close_session().
4376 *
4377 * Session Logout was requested. iscsit_close_session() will be called
4378 * elsewhere.
4379 *
4380 * Session Continuation is not being performed, start the Time2Retain
4381 * handler and check if sleep_on_sess_wait_sem is active.
4382 */
4383 if (!atomic_read(&sess->session_reinstatement) &&
4384 atomic_read(&sess->session_fall_back_to_erl0)) {
4385 spin_unlock_bh(&sess->conn_lock);
99367f01 4386 target_put_session(sess->se_sess);
e48354ce
NB		 4387
4388 return 0;
4389 } else if (atomic_read(&sess->session_logout)) {
4390 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4391 sess->session_state = TARG_SESS_STATE_FREE;
4392 spin_unlock_bh(&sess->conn_lock);
4393
4394 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4395 complete(&sess->session_wait_comp);
4396
4397 return 0;
4398 } else {
4399 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4400 sess->session_state = TARG_SESS_STATE_FAILED;
4401
4402 if (!atomic_read(&sess->session_continuation)) {
4403 spin_unlock_bh(&sess->conn_lock);
4404 iscsit_start_time2retain_handler(sess);
4405 } else
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 }
4413 spin_unlock_bh(&sess->conn_lock);
4414
4415 return 0;
4416}
4417
4418int iscsit_close_session(struct iscsi_session *sess)
4419{
60bfcf8e 4420 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4421 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4422
4423 if (atomic_read(&sess->nconn)) {
4424 pr_err("%d connection(s) still exist for iSCSI session"
4425 " to %s\n", atomic_read(&sess->nconn),
4426 sess->sess_ops->InitiatorName);
4427 BUG();
4428 }
4429
4430 spin_lock_bh(&se_tpg->session_lock);
4431 atomic_set(&sess->session_logout, 1);
4432 atomic_set(&sess->session_reinstatement, 1);
4433 iscsit_stop_time2retain_timer(sess);
4434 spin_unlock_bh(&se_tpg->session_lock);
4435
4436 /*
4437 * transport_deregister_session_configfs() will clear the
4438 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4439 * can be setting it again with __transport_register_session() in
4440 * iscsi_post_login_handler() again after the iscsit_stop_session()
4441 * completes in iscsi_np context.
4442 */
4443 transport_deregister_session_configfs(sess->se_sess);
4444
4445 /*
4446 * If any other processes are accessing this session pointer we must
4447 * wait until they have completed. If we are in an interrupt (the
4448 * time2retain handler) and contain and active session usage count we
4449 * restart the timer and exit.
4450 */
4451 if (!in_interrupt()) {
4452 if (iscsit_check_session_usage_count(sess) == 1)
4453 iscsit_stop_session(sess, 1, 1);
4454 } else {
4455 if (iscsit_check_session_usage_count(sess) == 2) {
4456 atomic_set(&sess->session_logout, 0);
4457 iscsit_start_time2retain_handler(sess);
4458 return 0;
4459 }
4460 }
4461
4462 transport_deregister_session(sess->se_sess);
4463
4464 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4465 iscsit_free_connection_recovery_entires(sess);
4466
4467 iscsit_free_all_ooo_cmdsns(sess);
4468
4469 spin_lock_bh(&se_tpg->session_lock);
4470 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4471 sess->session_state = TARG_SESS_STATE_FREE;
4472 pr_debug("Released iSCSI session from node: %s\n",
4473 sess->sess_ops->InitiatorName);
4474 tpg->nsessions--;
4475 if (tpg->tpg_tiqn)
4476 tpg->tpg_tiqn->tiqn_nsessions--;
4477
4478 pr_debug("Decremented number of active iSCSI Sessions on"
4479 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4480
4481 spin_lock(&sess_idr_lock);
4482 idr_remove(&sess_idr, sess->session_index);
4483 spin_unlock(&sess_idr_lock);
4484
4485 kfree(sess->sess_ops);
4486 sess->sess_ops = NULL;
4487 spin_unlock_bh(&se_tpg->session_lock);
4488
4489 kfree(sess);
4490 return 0;
4491}
4492
4493static void iscsit_logout_post_handler_closesession(
4494 struct iscsi_conn *conn)
4495{
4496 struct iscsi_session *sess = conn->sess;
4497
4498 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4499 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4500
4501 atomic_set(&conn->conn_logout_remove, 0);
4502 complete(&conn->conn_logout_comp);
4503
4504 iscsit_dec_conn_usage_count(conn);
4505 iscsit_stop_session(sess, 1, 1);
4506 iscsit_dec_session_usage_count(sess);
99367f01 4507 target_put_session(sess->se_sess);
e48354ce
NB		 4508}
4509
4510static void iscsit_logout_post_handler_samecid(
4511 struct iscsi_conn *conn)
4512{
4513 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4514 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4515
4516 atomic_set(&conn->conn_logout_remove, 0);
4517 complete(&conn->conn_logout_comp);
4518
4519 iscsit_cause_connection_reinstatement(conn, 1);
4520 iscsit_dec_conn_usage_count(conn);
4521}
4522
4523static void iscsit_logout_post_handler_diffcid(
4524 struct iscsi_conn *conn,
4525 u16 cid)
4526{
4527 struct iscsi_conn *l_conn;
4528 struct iscsi_session *sess = conn->sess;
4529
4530 if (!sess)
4531 return;
4532
4533 spin_lock_bh(&sess->conn_lock);
4534 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4535 if (l_conn->cid == cid) {
4536 iscsit_inc_conn_usage_count(l_conn);
4537 break;
4538 }
4539 }
4540 spin_unlock_bh(&sess->conn_lock);
4541
4542 if (!l_conn)
4543 return;
4544
4545 if (l_conn->sock)
4546 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4547
4548 spin_lock_bh(&l_conn->state_lock);
4549 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4550 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4551 spin_unlock_bh(&l_conn->state_lock);
4552
4553 iscsit_cause_connection_reinstatement(l_conn, 1);
4554 iscsit_dec_conn_usage_count(l_conn);
4555}
4556
4557/*
4558 * Return of 0 causes the TX thread to restart.
4559 */
2ec5a8c1 4560int iscsit_logout_post_handler(
e48354ce
NB		 4561 struct iscsi_cmd *cmd,
4562 struct iscsi_conn *conn)
4563{
4564 int ret = 0;
4565
4566 switch (cmd->logout_reason) {
4567 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4568 switch (cmd->logout_response) {
4569 case ISCSI_LOGOUT_SUCCESS:
4570 case ISCSI_LOGOUT_CLEANUP_FAILED:
4571 default:
4572 iscsit_logout_post_handler_closesession(conn);
4573 break;
4574 }
4575 ret = 0;
4576 break;
4577 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4578 if (conn->cid == cmd->logout_cid) {
4579 switch (cmd->logout_response) {
4580 case ISCSI_LOGOUT_SUCCESS:
4581 case ISCSI_LOGOUT_CLEANUP_FAILED:
4582 default:
4583 iscsit_logout_post_handler_samecid(conn);
4584 break;
4585 }
4586 ret = 0;
4587 } else {
4588 switch (cmd->logout_response) {
4589 case ISCSI_LOGOUT_SUCCESS:
4590 iscsit_logout_post_handler_diffcid(conn,
4591 cmd->logout_cid);
4592 break;
4593 case ISCSI_LOGOUT_CID_NOT_FOUND:
4594 case ISCSI_LOGOUT_CLEANUP_FAILED:
4595 default:
4596 break;
4597 }
4598 ret = 1;
4599 }
4600 break;
4601 case ISCSI_LOGOUT_REASON_RECOVERY:
4602 switch (cmd->logout_response) {
4603 case ISCSI_LOGOUT_SUCCESS:
4604 case ISCSI_LOGOUT_CID_NOT_FOUND:
4605 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4606 case ISCSI_LOGOUT_CLEANUP_FAILED:
4607 default:
4608 break;
4609 }
4610 ret = 1;
4611 break;
4612 default:
4613 break;
4614
4615 }
4616 return ret;
4617}
2ec5a8c1 4618EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4619
4620void iscsit_fail_session(struct iscsi_session *sess)
4621{
4622 struct iscsi_conn *conn;
4623
4624 spin_lock_bh(&sess->conn_lock);
4625 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4626 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4627 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4628 }
4629 spin_unlock_bh(&sess->conn_lock);
4630
4631 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4632 sess->session_state = TARG_SESS_STATE_FAILED;
4633}
4634
4635int iscsit_free_session(struct iscsi_session *sess)
4636{
4637 u16 conn_count = atomic_read(&sess->nconn);
4638 struct iscsi_conn *conn, *conn_tmp = NULL;
4639 int is_last;
4640
4641 spin_lock_bh(&sess->conn_lock);
4642 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4643
4644 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4645 conn_list) {
4646 if (conn_count == 0)
4647 break;
4648
4649 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4650 is_last = 1;
4651 } else {
4652 iscsit_inc_conn_usage_count(conn_tmp);
4653 is_last = 0;
4654 }
4655 iscsit_inc_conn_usage_count(conn);
4656
4657 spin_unlock_bh(&sess->conn_lock);
4658 iscsit_cause_connection_reinstatement(conn, 1);
4659 spin_lock_bh(&sess->conn_lock);
4660
4661 iscsit_dec_conn_usage_count(conn);
4662 if (is_last == 0)
4663 iscsit_dec_conn_usage_count(conn_tmp);
4664
4665 conn_count--;
4666 }
4667
4668 if (atomic_read(&sess->nconn)) {
4669 spin_unlock_bh(&sess->conn_lock);
4670 wait_for_completion(&sess->session_wait_comp);
4671 } else
4672 spin_unlock_bh(&sess->conn_lock);
4673
99367f01 4674 target_put_session(sess->se_sess);
e48354ce
NB		 4675 return 0;
4676}
4677
4678void iscsit_stop_session(
4679 struct iscsi_session *sess,
4680 int session_sleep,
4681 int connection_sleep)
4682{
4683 u16 conn_count = atomic_read(&sess->nconn);
4684 struct iscsi_conn *conn, *conn_tmp = NULL;
4685 int is_last;
4686
4687 spin_lock_bh(&sess->conn_lock);
4688 if (session_sleep)
4689 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4690
4691 if (connection_sleep) {
4692 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4693 conn_list) {
4694 if (conn_count == 0)
4695 break;
4696
4697 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4698 is_last = 1;
4699 } else {
4700 iscsit_inc_conn_usage_count(conn_tmp);
4701 is_last = 0;
4702 }
4703 iscsit_inc_conn_usage_count(conn);
4704
4705 spin_unlock_bh(&sess->conn_lock);
4706 iscsit_cause_connection_reinstatement(conn, 1);
4707 spin_lock_bh(&sess->conn_lock);
4708
4709 iscsit_dec_conn_usage_count(conn);
4710 if (is_last == 0)
4711 iscsit_dec_conn_usage_count(conn_tmp);
4712 conn_count--;
4713 }
4714 } else {
4715 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4716 iscsit_cause_connection_reinstatement(conn, 0);
4717 }
4718
4719 if (session_sleep && atomic_read(&sess->nconn)) {
4720 spin_unlock_bh(&sess->conn_lock);
4721 wait_for_completion(&sess->session_wait_comp);
4722 } else
4723 spin_unlock_bh(&sess->conn_lock);
4724}
4725
4726int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4727{
4728 struct iscsi_session *sess;
4729 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4730 struct se_session *se_sess, *se_sess_tmp;
4731 int session_count = 0;
4732
4733 spin_lock_bh(&se_tpg->session_lock);
4734 if (tpg->nsessions && !force) {
4735 spin_unlock_bh(&se_tpg->session_lock);
4736 return -1;
4737 }
4738
4739 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4740 sess_list) {
4741 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4742
4743 spin_lock(&sess->conn_lock);
4744 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4745 atomic_read(&sess->session_logout) ||
4746 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4747 spin_unlock(&sess->conn_lock);
4748 continue;
4749 }
4750 atomic_set(&sess->session_reinstatement, 1);
4751 spin_unlock(&sess->conn_lock);
4752 spin_unlock_bh(&se_tpg->session_lock);
4753
4754 iscsit_free_session(sess);
4755 spin_lock_bh(&se_tpg->session_lock);
4756
4757 session_count++;
4758 }
4759 spin_unlock_bh(&se_tpg->session_lock);
4760
4761 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4762 " Group: %hu\n", session_count, tpg->tpgt);
4763 return 0;
4764}
4765
4766MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4767MODULE_VERSION("4.1.x");
4768MODULE_AUTHOR("nab@Linux-iSCSI.org");
4769MODULE_LICENSE("GPL");
4770
4771module_init(iscsi_target_init_module);
4772module_exit(iscsi_target_cleanup_module);