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Merge branch 'bind_unbind' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
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
69110e3c 19#include <crypto/hash.h>
e48354ce
NB		 20#include <linux/string.h>
21#include <linux/kthread.h>
e48354ce 22#include <linux/completion.h>
827509e3 23#include <linux/module.h>
5538d294 24#include <linux/vmalloc.h>
40401530 25#include <linux/idr.h>
8dcf07be 26#include <linux/delay.h>
3f07c014 27#include <linux/sched/signal.h>
e48354ce 28#include <asm/unaligned.h>
8dcf07be 29#include <net/ipv6.h>
ba929992 30#include <scsi/scsi_proto.h>
e48354ce 31#include <scsi/iscsi_proto.h>
d28b1169 32#include <scsi/scsi_tcq.h>
e48354ce 33#include <target/target_core_base.h>
c4795fb2 34#include <target/target_core_fabric.h>
e48354ce 35
67f091f2 36#include <target/iscsi/iscsi_target_core.h>
e48354ce
NB		 37#include "iscsi_target_parameters.h"
38#include "iscsi_target_seq_pdu_list.h"
e48354ce
NB		 39#include "iscsi_target_datain_values.h"
40#include "iscsi_target_erl0.h"
41#include "iscsi_target_erl1.h"
42#include "iscsi_target_erl2.h"
43#include "iscsi_target_login.h"
44#include "iscsi_target_tmr.h"
45#include "iscsi_target_tpg.h"
46#include "iscsi_target_util.h"
47#include "iscsi_target.h"
48#include "iscsi_target_device.h"
67f091f2 49#include <target/iscsi/iscsi_target_stat.h>
e48354ce 50
baa4d64b
NB		 51#include <target/iscsi/iscsi_transport.h>
52
e48354ce
NB		 53static LIST_HEAD(g_tiqn_list);
54static LIST_HEAD(g_np_list);
55static DEFINE_SPINLOCK(tiqn_lock);
ee291e63 56static DEFINE_MUTEX(np_lock);
e48354ce
NB		 57
58static struct idr tiqn_idr;
59struct idr sess_idr;
60struct mutex auth_id_lock;
61spinlock_t sess_idr_lock;
62
63struct iscsit_global *iscsit_global;
64
e48354ce
NB		 65struct kmem_cache *lio_qr_cache;
66struct kmem_cache *lio_dr_cache;
67struct kmem_cache *lio_ooo_cache;
68struct kmem_cache *lio_r2t_cache;
69
70static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 71 struct iscsi_scsi_req *, u32);
e48354ce
NB		 72
73struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74{
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94}
95
96static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97{
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107}
108
109void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110{
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114}
115
116/*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121{
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
8f50c7f5 125 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
3829f381 131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
c46e22f1 132 if (!tiqn)
e48354ce 133 return ERR_PTR(-ENOMEM);
e48354ce
NB		 134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
e48354ce
NB		 144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
c9365bd0 146 idr_preload(GFP_KERNEL);
e48354ce 147 spin_lock(&tiqn_lock);
c9365bd0
TH		 148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 150 if (ret < 0) {
c9365bd0 151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 152 spin_unlock(&tiqn_lock);
c9365bd0 153 idr_preload_end();
e48354ce
NB		 154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
c9365bd0 157 tiqn->tiqn_index = ret;
e48354ce 158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 159
e48354ce 160 spin_unlock(&tiqn_lock);
c9365bd0 161 idr_preload_end();
e48354ce
NB		 162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167}
168
169static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170{
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181}
182
183void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184{
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206}
207
208int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209{
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
e48354ce
NB		 219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
a91eb7d9 233 ret = down_interruptible(&tpg->np_login_sem);
ee7619f2 234 if (ret != 0)
e48354ce
NB		 235 return -1;
236
a91eb7d9
NB		 237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
e48354ce
NB		 244
245 return 0;
246}
247
a91eb7d9
NB		 248void iscsit_login_kref_put(struct kref *kref)
249{
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254}
255
256int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
e48354ce
NB		 258{
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
a91eb7d9 261 up(&tpg->np_login_sem);
e48354ce 262
a91eb7d9
NB		 263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
e48354ce
NB		 265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270}
271
05b96892 272bool iscsit_check_np_match(
13a3cf08 273 struct sockaddr_storage *sockaddr,
05b96892 274 struct iscsi_np *np,
e48354ce
NB		 275 int network_transport)
276{
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 279 bool ip_match = false;
69d75574 280 u16 port, port_e;
e48354ce 281
05b96892
NB		 282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
69d75574 292 port_e = ntohs(sock_in6_e->sin6_port);
05b96892
NB		 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);
69d75574 301 port_e = ntohs(sock_in_e->sin_port);
05b96892
NB		 302 }
303
69d75574 304 if (ip_match && (port_e == port) &&
05b96892
NB		 305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309}
310
ee291e63
AG		 311/*
312 * Called with mutex np_lock held
313 */
05b96892 314static struct iscsi_np *iscsit_get_np(
13a3cf08 315 struct sockaddr_storage *sockaddr,
05b96892
NB		 316 int network_transport)
317{
318 struct iscsi_np *np;
319 bool match;
320
e48354ce 321 list_for_each_entry(np, &g_np_list, np_list) {
ee291e63 322 spin_lock_bh(&np->np_thread_lock);
e48354ce 323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
ee291e63 324 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 325 continue;
326 }
327
05b96892 328 match = iscsit_check_np_match(sockaddr, np, network_transport);
0bcc297e 329 if (match) {
e48354ce
NB		 330 /*
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
334 */
335 np->np_exports++;
ee291e63 336 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 337 return np;
338 }
ee291e63 339 spin_unlock_bh(&np->np_thread_lock);
e48354ce 340 }
e48354ce
NB		 341
342 return NULL;
343}
344
345struct iscsi_np *iscsit_add_np(
13a3cf08 346 struct sockaddr_storage *sockaddr,
e48354ce
NB		 347 int network_transport)
348{
e48354ce
NB		 349 struct iscsi_np *np;
350 int ret;
ee291e63
AG		 351
352 mutex_lock(&np_lock);
353
e48354ce
NB		 354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
ee291e63
AG		 358 if (np) {
359 mutex_unlock(&np_lock);
e48354ce 360 return np;
ee291e63 361 }
e48354ce 362
3829f381 363 np = kzalloc(sizeof(*np), GFP_KERNEL);
e48354ce 364 if (!np) {
ee291e63 365 mutex_unlock(&np_lock);
e48354ce
NB		 366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
e48354ce
NB		 370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
375 ret = iscsi_target_setup_login_socket(np, sockaddr);
376 if (ret != 0) {
377 kfree(np);
ee291e63 378 mutex_unlock(&np_lock);
e48354ce
NB		 379 return ERR_PTR(ret);
380 }
381
382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
383 if (IS_ERR(np->np_thread)) {
384 pr_err("Unable to create kthread: iscsi_np\n");
385 ret = PTR_ERR(np->np_thread);
386 kfree(np);
ee291e63 387 mutex_unlock(&np_lock);
e48354ce
NB		 388 return ERR_PTR(ret);
389 }
390 /*
391 * Increment the np_exports reference count now to prevent
392 * iscsit_del_np() below from being run while a new call to
393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
394 * active. We don't need to hold np->np_thread_lock at this
395 * point because iscsi_np has not been added to g_np_list yet.
396 */
397 np->np_exports = 1;
ee291e63 398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 399
e48354ce 400 list_add_tail(&np->np_list, &g_np_list);
ee291e63 401 mutex_unlock(&np_lock);
e48354ce 402
69d75574
AG		 403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
404 &np->np_sockaddr, np->np_transport->name);
e48354ce
NB		 405
406 return np;
407}
408
409int iscsit_reset_np_thread(
410 struct iscsi_np *np,
411 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 412 struct iscsi_portal_group *tpg,
413 bool shutdown)
e48354ce
NB		 414{
415 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
417 spin_unlock_bh(&np->np_thread_lock);
418 return 0;
419 }
420 np->np_thread_state = ISCSI_NP_THREAD_RESET;
421
422 if (np->np_thread) {
423 spin_unlock_bh(&np->np_thread_lock);
424 send_sig(SIGINT, np->np_thread, 1);
425 wait_for_completion(&np->np_restart_comp);
426 spin_lock_bh(&np->np_thread_lock);
427 }
428 spin_unlock_bh(&np->np_thread_lock);
429
a91eb7d9
NB		 430 if (tpg_np && shutdown) {
431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
432
433 wait_for_completion(&tpg_np->tpg_np_comp);
434 }
435
e48354ce
NB		 436 return 0;
437}
438
baa4d64b 439static void iscsit_free_np(struct iscsi_np *np)
e48354ce 440{
bf6932f4
AV		 441 if (np->np_socket)
442 sock_release(np->np_socket);
e48354ce
NB		 443}
444
445int iscsit_del_np(struct iscsi_np *np)
446{
447 spin_lock_bh(&np->np_thread_lock);
448 np->np_exports--;
449 if (np->np_exports) {
2363d196 450 np->enabled = true;
e48354ce
NB		 451 spin_unlock_bh(&np->np_thread_lock);
452 return 0;
453 }
454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
455 spin_unlock_bh(&np->np_thread_lock);
456
457 if (np->np_thread) {
458 /*
459 * We need to send the signal to wakeup Linux/Net
460 * which may be sleeping in sock_accept()..
461 */
462 send_sig(SIGINT, np->np_thread, 1);
463 kthread_stop(np->np_thread);
db6077fd 464 np->np_thread = NULL;
e48354ce 465 }
baa4d64b
NB		 466
467 np->np_transport->iscsit_free_np(np);
e48354ce 468
ee291e63 469 mutex_lock(&np_lock);
e48354ce 470 list_del(&np->np_list);
ee291e63 471 mutex_unlock(&np_lock);
e48354ce 472
69d75574
AG		 473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
474 &np->np_sockaddr, np->np_transport->name);
e48354ce 475
baa4d64b 476 iscsit_put_transport(np->np_transport);
e48354ce
NB		 477 kfree(np);
478 return 0;
479}
480
e8205cca 481static void iscsit_get_rx_pdu(struct iscsi_conn *);
2ec5a8c1 482
d2faaefb 483int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2ec5a8c1 484{
a4467018 485 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
2ec5a8c1 486}
d2faaefb 487EXPORT_SYMBOL(iscsit_queue_rsp);
2ec5a8c1 488
d2faaefb 489void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
131e6abc
NB		 490{
491 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
492
493 spin_lock_bh(&conn->cmd_lock);
064cdd2d
NB		 494 if (!list_empty(&cmd->i_conn_node) &&
495 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
131e6abc
NB		 496 list_del_init(&cmd->i_conn_node);
497 spin_unlock_bh(&conn->cmd_lock);
498
499 __iscsit_free_cmd(cmd, scsi_cmd, true);
500}
d2faaefb 501EXPORT_SYMBOL(iscsit_aborted_task);
131e6abc 502
2854bb23
VP		 503static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
504 u32, u32, u8 *, u8 *);
505static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
506
507static int
508iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
509 const void *data_buf, u32 data_buf_len)
510{
511 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
512 struct kvec *iov;
513 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
514 int ret;
515
516 iov = &cmd->iov_misc[0];
517 iov[niov].iov_base = cmd->pdu;
518 iov[niov++].iov_len = ISCSI_HDR_LEN;
519
520 if (conn->conn_ops->HeaderDigest) {
521 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
522
523 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
524 ISCSI_HDR_LEN, 0, NULL,
525 (u8 *)header_digest);
526
527 iov[0].iov_len += ISCSI_CRC_LEN;
528 tx_size += ISCSI_CRC_LEN;
529 pr_debug("Attaching CRC32C HeaderDigest"
530 " to opcode 0x%x 0x%08x\n",
531 hdr->opcode, *header_digest);
532 }
533
534 if (data_buf_len) {
535 u32 padding = ((-data_buf_len) & 3);
536
537 iov[niov].iov_base = (void *)data_buf;
538 iov[niov++].iov_len = data_buf_len;
539 tx_size += data_buf_len;
540
541 if (padding != 0) {
542 iov[niov].iov_base = &cmd->pad_bytes;
543 iov[niov++].iov_len = padding;
544 tx_size += padding;
545 pr_debug("Attaching %u additional"
546 " padding bytes.\n", padding);
547 }
548
549 if (conn->conn_ops->DataDigest) {
550 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
551 data_buf, data_buf_len,
552 padding,
553 (u8 *)&cmd->pad_bytes,
554 (u8 *)&cmd->data_crc);
555
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
562 }
563 }
564
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
567
568 ret = iscsit_send_tx_data(cmd, conn, 1);
569 if (ret < 0) {
570 iscsit_tx_thread_wait_for_tcp(conn);
571 return ret;
572 }
573
574 return 0;
575}
576
577static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578static void iscsit_unmap_iovec(struct iscsi_cmd *);
579static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
581static int
582iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
584{
585 struct kvec *iov;
586 u32 iov_count = 0, tx_size = 0;
587 int ret, iov_ret;
588
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
593
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
599 (u8 *)header_digest);
600
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
603
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
605 *header_digest);
606 }
607
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
610 if (iov_ret < 0)
611 return -1;
612
613 iov_count += iov_ret;
614 tx_size += datain->length;
615
616 cmd->padding = ((-datain->length) & 3);
617 if (cmd->padding) {
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
621
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 }
624
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
627 cmd, datain->offset,
628 datain->length,
629 cmd->padding,
630 cmd->pad_bytes);
631
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
635
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
638 }
639
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
642
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
644
645 iscsit_unmap_iovec(cmd);
646
647 if (ret < 0) {
648 iscsit_tx_thread_wait_for_tcp(conn);
649 return ret;
650 }
651
652 return 0;
653}
654
655static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
657 u32 buf_len)
658{
659 if (dr)
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 else
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663}
664
e70beee7
NB		 665static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666{
667 return TARGET_PROT_NORMAL;
668}
669
baa4d64b
NB		 670static struct iscsit_transport iscsi_target_transport = {
671 .name = "iSCSI/TCP",
672 .transport_type = ISCSI_TCP,
bd027d85 673 .rdma_shutdown = false,
baa4d64b
NB		 674 .owner = NULL,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 685 .iscsit_aborted_task = iscsit_aborted_task,
2854bb23 686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
e8205cca 687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
e70beee7 688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
baa4d64b
NB		 689};
690
e48354ce
NB		 691static int __init iscsi_target_init_module(void)
692{
88dcd2da 693 int ret = 0, size;
e48354ce
NB		 694
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
3829f381 696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
c46e22f1 697 if (!iscsit_global)
e48354ce 698 return -1;
c46e22f1 699
88dcd2da 700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 701 mutex_init(&auth_id_lock);
702 spin_lock_init(&sess_idr_lock);
703 idr_init(&tiqn_idr);
704 idr_init(&sess_idr);
705
9ac8928e
CH		 706 ret = target_register_template(&iscsi_ops);
707 if (ret)
e48354ce
NB		 708 goto out;
709
88dcd2da
NB		 710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
711 iscsit_global->ts_bitmap = vzalloc(size);
c46e22f1 712 if (!iscsit_global->ts_bitmap)
e48354ce 713 goto configfs_out;
e48354ce 714
e48354ce
NB		 715 lio_qr_cache = kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req),
717 __alignof__(struct iscsi_queue_req), 0, NULL);
718 if (!lio_qr_cache) {
719 pr_err("nable to kmem_cache_create() for"
720 " lio_qr_cache\n");
88dcd2da 721 goto bitmap_out;
e48354ce
NB		 722 }
723
724 lio_dr_cache = kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req),
726 __alignof__(struct iscsi_datain_req), 0, NULL);
727 if (!lio_dr_cache) {
728 pr_err("Unable to kmem_cache_create() for"
729 " lio_dr_cache\n");
730 goto qr_out;
731 }
732
733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn),
735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
736 if (!lio_ooo_cache) {
737 pr_err("Unable to kmem_cache_create() for"
738 " lio_ooo_cache\n");
739 goto dr_out;
740 }
741
742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 0, NULL);
745 if (!lio_r2t_cache) {
746 pr_err("Unable to kmem_cache_create() for"
747 " lio_r2t_cache\n");
748 goto ooo_out;
749 }
750
baa4d64b
NB		 751 iscsit_register_transport(&iscsi_target_transport);
752
e48354ce
NB		 753 if (iscsit_load_discovery_tpg() < 0)
754 goto r2t_out;
755
756 return ret;
757r2t_out:
7f2c53bb 758 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 759 kmem_cache_destroy(lio_r2t_cache);
760ooo_out:
761 kmem_cache_destroy(lio_ooo_cache);
762dr_out:
763 kmem_cache_destroy(lio_dr_cache);
764qr_out:
765 kmem_cache_destroy(lio_qr_cache);
88dcd2da
NB		 766bitmap_out:
767 vfree(iscsit_global->ts_bitmap);
e48354ce 768configfs_out:
9ac8928e
CH		 769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global->discovery_tpg)
771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
772 target_unregister_template(&iscsi_ops);
e48354ce
NB		 773out:
774 kfree(iscsit_global);
775 return -ENOMEM;
776}
777
778static void __exit iscsi_target_cleanup_module(void)
779{
e48354ce 780 iscsit_release_discovery_tpg();
baa4d64b 781 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 782 kmem_cache_destroy(lio_qr_cache);
783 kmem_cache_destroy(lio_dr_cache);
784 kmem_cache_destroy(lio_ooo_cache);
785 kmem_cache_destroy(lio_r2t_cache);
786
9ac8928e
CH		 787 /*
788 * Shutdown discovery sessions and disable discovery TPG
789 */
790 if (iscsit_global->discovery_tpg)
791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
e48354ce 792
9ac8928e 793 target_unregister_template(&iscsi_ops);
e48354ce 794
88dcd2da 795 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 796 kfree(iscsit_global);
797}
798
d2faaefb 799int iscsit_add_reject(
ba159914 800 struct iscsi_conn *conn,
e48354ce 801 u8 reason,
ba159914 802 unsigned char *buf)
e48354ce
NB		 803{
804 struct iscsi_cmd *cmd;
e48354ce 805
676687c6 806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 807 if (!cmd)
808 return -1;
809
810 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 811 cmd->reject_reason = reason;
e48354ce 812
1c3d5794 813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 814 if (!cmd->buf_ptr) {
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 816 iscsit_free_cmd(cmd, false);
e48354ce
NB		 817 return -1;
818 }
e48354ce
NB		 819
820 spin_lock_bh(&conn->cmd_lock);
2fbb471e 821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 822 spin_unlock_bh(&conn->cmd_lock);
823
824 cmd->i_state = ISTATE_SEND_REJECT;
825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
826
ba159914 827 return -1;
e48354ce 828}
d2faaefb 829EXPORT_SYMBOL(iscsit_add_reject);
e48354ce 830
ba159914
NB		 831static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd *cmd,
e48354ce 833 u8 reason,
ba159914
NB		 834 bool add_to_conn,
835 unsigned char *buf)
e48354ce
NB		 836{
837 struct iscsi_conn *conn;
e48354ce
NB		 838
839 if (!cmd->conn) {
840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
841 cmd->init_task_tag);
842 return -1;
843 }
844 conn = cmd->conn;
845
846 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 847 cmd->reject_reason = reason;
e48354ce 848
1c3d5794 849 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 850 if (!cmd->buf_ptr) {
851 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 852 iscsit_free_cmd(cmd, false);
e48354ce
NB		 853 return -1;
854 }
e48354ce
NB		 855
856 if (add_to_conn) {
857 spin_lock_bh(&conn->cmd_lock);
2fbb471e 858 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 859 spin_unlock_bh(&conn->cmd_lock);
860 }
861
862 cmd->i_state = ISTATE_SEND_REJECT;
863 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 864 /*
865 * Perform the kref_put now if se_cmd has already been setup by
866 * scsit_setup_scsi_cmd()
867 */
868 if (cmd->se_cmd.se_tfo != NULL) {
869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
afc16604 870 target_put_sess_cmd(&cmd->se_cmd);
3e1c81a9 871 }
ba159914
NB		 872 return -1;
873}
e48354ce 874
ba159914
NB		 875static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
876 unsigned char *buf)
877{
878 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
879}
880
881int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
882{
883 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce 884}
d2faaefb 885EXPORT_SYMBOL(iscsit_reject_cmd);
e48354ce
NB		 886
887/*
888 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 889 * kernel sockets to copy data in/out.
e48354ce
NB		 890 */
891static int iscsit_map_iovec(
892 struct iscsi_cmd *cmd,
893 struct kvec *iov,
894 u32 data_offset,
895 u32 data_length)
896{
897 u32 i = 0;
898 struct scatterlist *sg;
899 unsigned int page_off;
900
901 /*
bfb79eac 902 * We know each entry in t_data_sg contains a page.
e48354ce 903 */
2b16509c
IH		 904 u32 ent = data_offset / PAGE_SIZE;
905
906 if (ent >= cmd->se_cmd.t_data_nents) {
907 pr_err("Initial page entry out-of-bounds\n");
908 return -1;
909 }
910
911 sg = &cmd->se_cmd.t_data_sg[ent];
e48354ce
NB		 912 page_off = (data_offset % PAGE_SIZE);
913
914 cmd->first_data_sg = sg;
915 cmd->first_data_sg_off = page_off;
916
917 while (data_length) {
918 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
919
920 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
921 iov[i].iov_len = cur_len;
922
923 data_length -= cur_len;
924 page_off = 0;
925 sg = sg_next(sg);
926 i++;
927 }
928
929 cmd->kmapped_nents = i;
930
931 return i;
932}
933
934static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
935{
936 u32 i;
937 struct scatterlist *sg;
938
939 sg = cmd->first_data_sg;
940
941 for (i = 0; i < cmd->kmapped_nents; i++)
942 kunmap(sg_page(&sg[i]));
943}
944
945static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
946{
f56cbbb4
NB		 947 LIST_HEAD(ack_list);
948 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 949
950 conn->exp_statsn = exp_statsn;
951
3e1c81a9
NB		 952 if (conn->sess->sess_ops->RDMAExtensions)
953 return;
954
e48354ce 955 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 956 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 957 spin_lock(&cmd->istate_lock);
958 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 959 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 960 cmd->i_state = ISTATE_REMOVE;
961 spin_unlock(&cmd->istate_lock);
f56cbbb4 962 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 963 continue;
964 }
965 spin_unlock(&cmd->istate_lock);
966 }
967 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 968
969 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 970 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 971 iscsit_free_cmd(cmd, false);
972 }
e48354ce
NB		 973}
974
975static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
976{
f80e8ed3 977 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 978
c0427f15 979 iov_count += ISCSI_IOV_DATA_BUFFER;
f1725110 980 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
c46e22f1 981 if (!cmd->iov_data)
e48354ce 982 return -ENOMEM;
e48354ce
NB		 983
984 cmd->orig_iov_data_count = iov_count;
985 return 0;
986}
987
3e1c81a9
NB		 988int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
989 unsigned char *buf)
e48354ce 990{
3e1c81a9 991 int data_direction, payload_length;
e48354ce 992 struct iscsi_scsi_req *hdr;
d28b1169
AG		 993 int iscsi_task_attr;
994 int sam_task_attr;
e48354ce 995
04f3b31b 996 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 997
998 hdr = (struct iscsi_scsi_req *) buf;
999 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 1000
1001 /* FIXME; Add checks for AdditionalHeaderSegment */
1002
1003 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1004 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1005 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1006 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 1007 return iscsit_add_reject_cmd(cmd,
1008 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1009 }
1010
1011 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1012 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013 /*
4454b66c
NB		 1014 * From RFC-3720 Section 10.3.1:
1015 *
1016 * "Either or both of R and W MAY be 1 when either the
1017 * Expected Data Transfer Length and/or Bidirectional Read
1018 * Expected Data Transfer Length are 0"
1019 *
1020 * For this case, go ahead and clear the unnecssary bits
1021 * to avoid any confusion with ->data_direction.
e48354ce 1022 */
4454b66c
NB		 1023 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1024 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 1025
4454b66c 1026 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 1027 " set when Expected Data Transfer Length is 0 for"
4454b66c 1028 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 1029 }
e48354ce
NB		 1030
1031 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1032 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1033 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1034 " MUST be set if Expected Data Transfer Length is not 0."
1035 " Bad iSCSI Initiator\n");
ba159914
NB		 1036 return iscsit_add_reject_cmd(cmd,
1037 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1038 }
1039
1040 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1041 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1042 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 1043 return iscsit_add_reject_cmd(cmd,
1044 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1045 }
1046
1047 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1048 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1049 " Scsi Command PDU.\n");
ba159914
NB		 1050 return iscsit_add_reject_cmd(cmd,
1051 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1052 }
1053
1054 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1055 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1056 " protocol error.\n", payload_length);
ba159914
NB		 1057 return iscsit_add_reject_cmd(cmd,
1058 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1059 }
1060
ba159914 1061 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 1062 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1063 pr_err("Expected Data Transfer Length and Length of"
1064 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1065 " bit is not set protocol error\n");
ba159914
NB		 1066 return iscsit_add_reject_cmd(cmd,
1067 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1068 }
1069
50e5c87d 1070 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 1071 pr_err("DataSegmentLength: %u is greater than"
1072 " EDTL: %u, protocol error.\n", payload_length,
1073 hdr->data_length);
ba159914
NB		 1074 return iscsit_add_reject_cmd(cmd,
1075 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1076 }
1077
21f5aa7e 1078 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1079 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1080 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1081 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1082 return iscsit_add_reject_cmd(cmd,
1083 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1084 }
1085
1086 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1087 pr_err("DataSegmentLength: %u is greater than"
1088 " FirstBurstLength: %u, protocol error.\n",
1089 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 1090 return iscsit_add_reject_cmd(cmd,
1091 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1092 }
1093
1094 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1095 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1096 DMA_NONE;
1097
d28b1169 1098 cmd->data_direction = data_direction;
d28b1169
AG		 1099 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100 /*
1101 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102 */
1103 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1104 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
68d81f40 1105 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169 1106 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
68d81f40 1107 sam_task_attr = TCM_ORDERED_TAG;
d28b1169 1108 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
68d81f40 1109 sam_task_attr = TCM_HEAD_TAG;
d28b1169 1110 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
68d81f40 1111 sam_task_attr = TCM_ACA_TAG;
d28b1169
AG		 1112 else {
1113 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
68d81f40
CH		 1114 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1115 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169
AG		 1116 }
1117
e48354ce
NB		 1118 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1119 cmd->i_state = ISTATE_NEW_CMD;
1120 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1121 cmd->immediate_data = (payload_length) ? 1 : 0;
1122 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1123 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1124 if (cmd->unsolicited_data)
1125 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126
1127 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
9547308b 1128 if (hdr->flags & ISCSI_FLAG_CMD_READ)
c1e34b64 1129 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
9547308b 1130 else
e48354ce 1131 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1132 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1133 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1134 cmd->first_burst_len = payload_length;
1135
3e1c81a9
NB		 1136 if (!conn->sess->sess_ops->RDMAExtensions &&
1137 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 1138 struct iscsi_datain_req *dr;
1139
1140 dr = iscsit_allocate_datain_req();
1141 if (!dr)
ba159914
NB		 1142 return iscsit_add_reject_cmd(cmd,
1143 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1144
1145 iscsit_attach_datain_req(cmd, dr);
1146 }
1147
065ca1e4
AG		 1148 /*
1149 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150 */
9ac8928e 1151 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
50e5c87d
CH		 1152 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1153 cmd->data_direction, sam_task_attr,
1154 cmd->sense_buffer + 2);
065ca1e4
AG		 1155
1156 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1157 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 1158 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1159 conn->cid);
1160
afc16604 1161 target_get_sess_cmd(&cmd->se_cmd, true);
065ca1e4 1162
de103c93
CH		 1163 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1164 scsilun_to_int(&hdr->lun));
1165 if (cmd->sense_reason)
1166 goto attach_cmd;
1167
649ee054
BVA		 1168 /* only used for printks or comparing with ->ref_task_tag */
1169 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
de103c93
CH		 1170 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1171 if (cmd->sense_reason) {
1172 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1173 return iscsit_add_reject_cmd(cmd,
1174 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1175 }
de103c93 1176
e48354ce
NB		 1177 goto attach_cmd;
1178 }
a12f41f8 1179
de103c93 1180 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1181 return iscsit_add_reject_cmd(cmd,
1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1183 }
1184
1185attach_cmd:
1186 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1187 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1188 spin_unlock_bh(&conn->cmd_lock);
1189 /*
1190 * Check if we need to delay processing because of ALUA
1191 * Active/NonOptimized primary access state..
1192 */
1193 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1194
3e1c81a9
NB		 1195 return 0;
1196}
1197EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1198
3e1c81a9
NB		 1199void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200{
1201 iscsit_set_dataout_sequence_values(cmd);
1202
1203 spin_lock_bh(&cmd->dataout_timeout_lock);
1204 iscsit_start_dataout_timer(cmd, cmd->conn);
1205 spin_unlock_bh(&cmd->dataout_timeout_lock);
1206}
1207EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208
1209int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1210 struct iscsi_scsi_req *hdr)
1211{
1212 int cmdsn_ret = 0;
e48354ce
NB		 1213 /*
1214 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1215 * the Immediate Bit is not set, and no Immediate
1216 * Data is attached.
1217 *
1218 * A PDU/CmdSN carrying Immediate Data can only
1219 * be processed after the DataCRC has passed.
1220 * If the DataCRC fails, the CmdSN MUST NOT
1221 * be acknowledged. (See below)
1222 */
1223 if (!cmd->immediate_data) {
561bf158
NB		 1224 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1225 (unsigned char *)hdr, hdr->cmdsn);
1226 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227 return -1;
1228 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
afc16604 1229 target_put_sess_cmd(&cmd->se_cmd);
7e32da55 1230 return 0;
3e1c81a9 1231 }
e48354ce
NB		 1232 }
1233
50e5c87d 1234 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1235
1236 /*
1237 * If no Immediate Data is attached, it's OK to return now.
1238 */
1239 if (!cmd->immediate_data) {
3e1c81a9
NB		 1240 if (!cmd->sense_reason && cmd->unsolicited_data)
1241 iscsit_set_unsoliticed_dataout(cmd);
1242 if (!cmd->sense_reason)
1243 return 0;
e48354ce 1244
afc16604 1245 target_put_sess_cmd(&cmd->se_cmd);
e48354ce
NB		 1246 return 0;
1247 }
1248
1249 /*
3e1c81a9
NB		 1250 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1251 * execution. These exceptions are processed in CmdSN order using
1252 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1253 */
de103c93 1254 if (cmd->sense_reason) {
561bf158
NB		 1255 if (cmd->reject_reason)
1256 return 0;
1257
3e1c81a9 1258 return 1;
e48354ce
NB		 1259 }
1260 /*
1261 * Call directly into transport_generic_new_cmd() to perform
1262 * the backend memory allocation.
1263 */
de103c93 1264 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1265 if (cmd->sense_reason)
3e1c81a9 1266 return 1;
e48354ce 1267
3e1c81a9
NB		 1268 return 0;
1269}
1270EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1271
1272static int
1273iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1274 bool dump_payload)
1275{
1276 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1277 /*
1278 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1279 */
0bcc297e 1280 if (dump_payload)
3e1c81a9 1281 goto after_immediate_data;
abb85a9b
NB		 1282 /*
1283 * Check for underflow case where both EDTL and immediate data payload
1284 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1285 * already been set in target_cmd_size_check() as se_cmd->data_length.
1286 *
1287 * For this special case, fail the command and dump the immediate data
1288 * payload.
1289 */
1290 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1291 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1292 goto after_immediate_data;
1293 }
3e1c81a9
NB		 1294
1295 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1296 cmd->first_burst_len);
e48354ce
NB		 1297after_immediate_data:
1298 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1299 /*
1300 * A PDU/CmdSN carrying Immediate Data passed
1301 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1302 * Immediate Bit is not set.
1303 */
561bf158
NB		 1304 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1305 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1306 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1307 return -1;
3e1c81a9 1308
9d86a2be 1309 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1310 int rc;
1311
1312 rc = iscsit_dump_data_payload(cmd->conn,
1313 cmd->first_burst_len, 1);
afc16604 1314 target_put_sess_cmd(&cmd->se_cmd);
561bf158 1315 return rc;
3e1c81a9
NB		 1316 } else if (cmd->unsolicited_data)
1317 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1318
e48354ce
NB		 1319 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1320 /*
1321 * Immediate Data failed DataCRC and ERL>=1,
1322 * silently drop this PDU and let the initiator
1323 * plug the CmdSN gap.
1324 *
1325 * FIXME: Send Unsolicited NOPIN with reserved
1326 * TTT here to help the initiator figure out
1327 * the missing CmdSN, although they should be
1328 * intelligent enough to determine the missing
1329 * CmdSN and issue a retry to plug the sequence.
1330 */
1331 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1332 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1333 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1334 return -1;
1335
1336 return 0;
1337}
1338
3e1c81a9
NB		 1339static int
1340iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1341 unsigned char *buf)
1342{
1343 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1344 int rc, immed_data;
1345 bool dump_payload = false;
1346
1347 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1348 if (rc < 0)
561bf158 1349 return 0;
3e1c81a9
NB		 1350 /*
1351 * Allocation iovecs needed for struct socket operations for
1352 * traditional iSCSI block I/O.
1353 */
1354 if (iscsit_allocate_iovecs(cmd) < 0) {
b815fc12 1355 return iscsit_reject_cmd(cmd,
ba159914 1356 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1357 }
1358 immed_data = cmd->immediate_data;
1359
1360 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1361 if (rc < 0)
1362 return rc;
1363 else if (rc > 0)
1364 dump_payload = true;
1365
1366 if (!immed_data)
1367 return 0;
1368
1369 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1370}
1371
e48354ce 1372static u32 iscsit_do_crypto_hash_sg(
69110e3c 1373 struct ahash_request *hash,
e48354ce
NB		 1374 struct iscsi_cmd *cmd,
1375 u32 data_offset,
1376 u32 data_length,
1377 u32 padding,
1378 u8 *pad_bytes)
1379{
1380 u32 data_crc;
e48354ce
NB		 1381 struct scatterlist *sg;
1382 unsigned int page_off;
1383
69110e3c 1384 crypto_ahash_init(hash);
e48354ce
NB		 1385
1386 sg = cmd->first_data_sg;
1387 page_off = cmd->first_data_sg_off;
1388
e48354ce 1389 while (data_length) {
aa75679c 1390 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
e48354ce 1391
69110e3c
HX		 1392 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1393 crypto_ahash_update(hash);
e48354ce
NB		 1394
1395 data_length -= cur_len;
1396 page_off = 0;
aa75679c
AP		 1397 /* iscsit_map_iovec has already checked for invalid sg pointers */
1398 sg = sg_next(sg);
e48354ce
NB		 1399 }
1400
1401 if (padding) {
1402 struct scatterlist pad_sg;
1403
1404 sg_init_one(&pad_sg, pad_bytes, padding);
69110e3c
HX		 1405 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1406 padding);
1407 crypto_ahash_finup(hash);
1408 } else {
1409 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1410 crypto_ahash_final(hash);
e48354ce 1411 }
e48354ce
NB		 1412
1413 return data_crc;
1414}
1415
1416static void iscsit_do_crypto_hash_buf(
69110e3c 1417 struct ahash_request *hash,
80690fdb 1418 const void *buf,
e48354ce
NB		 1419 u32 payload_length,
1420 u32 padding,
1421 u8 *pad_bytes,
1422 u8 *data_crc)
1423{
69110e3c 1424 struct scatterlist sg[2];
e48354ce 1425
69110e3c
HX		 1426 sg_init_table(sg, ARRAY_SIZE(sg));
1427 sg_set_buf(sg, buf, payload_length);
1428 sg_set_buf(sg + 1, pad_bytes, padding);
e48354ce 1429
69110e3c 1430 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
e48354ce 1431
69110e3c 1432 crypto_ahash_digest(hash);
e48354ce
NB		 1433}
1434
3e1c81a9 1435int
9a584bf9
VP		 1436__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1437 struct iscsi_cmd *cmd, u32 payload_length,
1438 bool *success)
e48354ce 1439{
9a584bf9 1440 struct iscsi_data *hdr = buf;
e48354ce 1441 struct se_cmd *se_cmd;
3e1c81a9 1442 int rc;
e48354ce 1443
e48354ce 1444 /* iSCSI write */
04f3b31b 1445 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1446
e48354ce
NB		 1447 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1448 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1449 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1450 payload_length, conn->cid);
1451
1452 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1453 pr_err("Command ITT: 0x%08x received DataOUT after"
1454 " last DataOUT received, dumping payload\n",
1455 cmd->init_task_tag);
1456 return iscsit_dump_data_payload(conn, payload_length, 1);
1457 }
1458
1459 if (cmd->data_direction != DMA_TO_DEVICE) {
1460 pr_err("Command ITT: 0x%08x received DataOUT for a"
1461 " NON-WRITE command.\n", cmd->init_task_tag);
97c99b47 1462 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1463 }
1464 se_cmd = &cmd->se_cmd;
1465 iscsit_mod_dataout_timer(cmd);
1466
50e5c87d 1467 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1468 pr_err("DataOut Offset: %u, Length %u greater than"
1469 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1470 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1471 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1472 }
1473
1474 if (cmd->unsolicited_data) {
1475 int dump_unsolicited_data = 0;
1476
1477 if (conn->sess->sess_ops->InitialR2T) {
1478 pr_err("Received unexpected unsolicited data"
1479 " while InitialR2T=Yes, protocol error.\n");
1480 transport_send_check_condition_and_sense(&cmd->se_cmd,
1481 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1482 return -1;
1483 }
1484 /*
1485 * Special case for dealing with Unsolicited DataOUT
1486 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1487 * failures;
1488 */
1489
1490 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1491 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1492 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1493 dump_unsolicited_data = 1;
e48354ce
NB		 1494
1495 if (dump_unsolicited_data) {
1496 /*
1497 * Check if a delayed TASK_ABORTED status needs to
1498 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
5a342521 1499 * received with the unsolicited data out.
e48354ce
NB		 1500 */
1501 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1502 iscsit_stop_dataout_timer(cmd);
1503
1504 transport_check_aborted_status(se_cmd,
1505 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1506 return iscsit_dump_data_payload(conn, payload_length, 1);
1507 }
1508 } else {
1509 /*
1510 * For the normal solicited data path:
1511 *
1512 * Check for a delayed TASK_ABORTED status and dump any
1513 * incoming data out payload if one exists. Also, when the
1514 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1515 * data out sequence, we decrement outstanding_r2ts. Once
1516 * outstanding_r2ts reaches zero, go ahead and send the delayed
1517 * TASK_ABORTED status.
1518 */
7d680f3b 1519 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1520 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1521 if (--cmd->outstanding_r2ts < 1) {
1522 iscsit_stop_dataout_timer(cmd);
1523 transport_check_aborted_status(
1524 se_cmd, 1);
1525 }
1526
1527 return iscsit_dump_data_payload(conn, payload_length, 1);
1528 }
1529 }
1530 /*
0d5efb8a 1531 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
e48354ce
NB		 1532 * within-command recovery checks before receiving the payload.
1533 */
3e1c81a9
NB		 1534 rc = iscsit_check_pre_dataout(cmd, buf);
1535 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1536 return 0;
3e1c81a9 1537 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce 1538 return -1;
9a584bf9 1539 *success = true;
3e1c81a9
NB		 1540 return 0;
1541}
9a584bf9
VP		 1542EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1543
1544int
1545iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1546 struct iscsi_cmd **out_cmd)
1547{
1548 struct iscsi_data *hdr = buf;
1549 struct iscsi_cmd *cmd;
1550 u32 payload_length = ntoh24(hdr->dlength);
1551 int rc;
1552 bool success = false;
1553
1554 if (!payload_length) {
1555 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1556 return 0;
1557 }
1558
1559 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1560 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1561 " MaxXmitDataSegmentLength: %u\n", payload_length,
1562 conn->conn_ops->MaxXmitDataSegmentLength);
1563 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1564 }
1565
1566 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1567 if (!cmd)
1568 return 0;
1569
1570 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1571
1572 if (success)
1573 *out_cmd = cmd;
1574
1575 return rc;
1576}
3e1c81a9
NB		 1577EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1578
1579static int
1580iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1581 struct iscsi_data *hdr)
1582{
1583 struct kvec *iov;
1584 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1585 u32 payload_length = ntoh24(hdr->dlength);
1586 int iov_ret, data_crc_failed = 0;
1587
e48354ce
NB		 1588 rx_size += payload_length;
1589 iov = &cmd->iov_data[0];
1590
50e5c87d
CH		 1591 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1592 payload_length);
e48354ce
NB		 1593 if (iov_ret < 0)
1594 return -1;
1595
1596 iov_count += iov_ret;
1597
1598 padding = ((-payload_length) & 3);
1599 if (padding != 0) {
1600 iov[iov_count].iov_base = cmd->pad_bytes;
1601 iov[iov_count++].iov_len = padding;
1602 rx_size += padding;
1603 pr_debug("Receiving %u padding bytes.\n", padding);
1604 }
1605
1606 if (conn->conn_ops->DataDigest) {
1607 iov[iov_count].iov_base = &checksum;
1608 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1609 rx_size += ISCSI_CRC_LEN;
1610 }
1611
1612 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1613
1614 iscsit_unmap_iovec(cmd);
1615
1616 if (rx_got != rx_size)
1617 return -1;
1618
1619 if (conn->conn_ops->DataDigest) {
1620 u32 data_crc;
1621
69110e3c 1622 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
50e5c87d
CH		 1623 be32_to_cpu(hdr->offset),
1624 payload_length, padding,
e48354ce
NB		 1625 cmd->pad_bytes);
1626
1627 if (checksum != data_crc) {
1628 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1629 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1630 " does not match computed 0x%08x\n",
1631 hdr->itt, hdr->offset, payload_length,
1632 hdr->datasn, checksum, data_crc);
1633 data_crc_failed = 1;
1634 } else {
1635 pr_debug("Got CRC32C DataDigest 0x%08x for"
1636 " %u bytes of Data Out\n", checksum,
1637 payload_length);
1638 }
1639 }
3e1c81a9
NB		 1640
1641 return data_crc_failed;
1642}
1643
1644int
1645iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1646 bool data_crc_failed)
1647{
1648 struct iscsi_conn *conn = cmd->conn;
1649 int rc, ooo_cmdsn;
e48354ce
NB		 1650 /*
1651 * Increment post receive data and CRC values or perform
1652 * within-command recovery.
1653 */
3e1c81a9
NB		 1654 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1655 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1656 return 0;
3e1c81a9 1657 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1658 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1659 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1660 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1661 /*
1662 * Handle extra special case for out of order
1663 * Unsolicited Data Out.
1664 */
1665 spin_lock_bh(&cmd->istate_lock);
1666 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1667 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1668 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1669 spin_unlock_bh(&cmd->istate_lock);
1670
1671 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1672 if (ooo_cmdsn)
1673 return 0;
1674 target_execute_cmd(&cmd->se_cmd);
1675 return 0;
e48354ce
NB		 1676 } else /* DATAOUT_CANNOT_RECOVER */
1677 return -1;
1678
1679 return 0;
1680}
3e1c81a9 1681EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1682
3e1c81a9
NB		 1683static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1684{
dbcbc95c 1685 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1686 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1687 int rc;
1688 bool data_crc_failed = false;
1689
1690 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1691 if (rc < 0)
561bf158 1692 return 0;
3e1c81a9
NB		 1693 else if (!cmd)
1694 return 0;
1695
1696 rc = iscsit_get_dataout(conn, cmd, hdr);
1697 if (rc < 0)
1698 return rc;
1699 else if (rc > 0)
1700 data_crc_failed = true;
1701
1702 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1703}
1704
778de368
NB		 1705int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1706 struct iscsi_nopout *hdr)
e48354ce 1707{
778de368 1708 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1709
a3662605
AH		 1710 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1711 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1712 if (!cmd)
1713 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1714 (unsigned char *)hdr);
1715
1716 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1717 (unsigned char *)hdr);
1718 }
1719
66c7db68 1720 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1721 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1722 " not set, protocol error.\n");
28aaa950
NB		 1723 if (!cmd)
1724 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725 (unsigned char *)hdr);
1726
ba159914
NB		 1727 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728 (unsigned char *)hdr);
e48354ce
NB		 1729 }
1730
21f5aa7e 1731 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1732 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1733 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1734 " error.\n", payload_length,
21f5aa7e 1735 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1736 if (!cmd)
1737 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1738 (unsigned char *)hdr);
1739
ba159914
NB		 1740 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1741 (unsigned char *)hdr);
e48354ce
NB		 1742 }
1743
3e1c81a9 1744 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1745 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1746 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1747 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1748 payload_length);
1749 /*
1750 * This is not a response to a Unsolicited NopIN, which means
1751 * it can either be a NOPOUT ping request (with a valid ITT),
1752 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1753 * Either way, make sure we allocate an struct iscsi_cmd, as both
1754 * can contain ping data.
1755 */
50e5c87d 1756 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1757 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1758 cmd->i_state = ISTATE_SEND_NOPIN;
1759 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1760 1 : 0);
1761 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1762 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1763 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1764 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1765 cmd->data_direction = DMA_NONE;
1766 }
1767
778de368
NB		 1768 return 0;
1769}
1770EXPORT_SYMBOL(iscsit_setup_nop_out);
1771
1772int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1773 struct iscsi_nopout *hdr)
1774{
1775 struct iscsi_cmd *cmd_p = NULL;
1776 int cmdsn_ret = 0;
1777 /*
1778 * Initiator is expecting a NopIN ping reply..
1779 */
1780 if (hdr->itt != RESERVED_ITT) {
7cbfcc95
NB		 1781 if (!cmd)
1782 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1783 (unsigned char *)hdr);
778de368
NB		 1784
1785 spin_lock_bh(&conn->cmd_lock);
1786 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1787 spin_unlock_bh(&conn->cmd_lock);
1788
1789 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1790
1791 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1792 iscsit_add_cmd_to_response_queue(cmd, conn,
1793 cmd->i_state);
1794 return 0;
1795 }
1796
561bf158
NB		 1797 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1798 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1799 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1800 return 0;
778de368 1801 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1802 return -1;
778de368
NB		 1803
1804 return 0;
1805 }
1806 /*
1807 * This was a response to a unsolicited NOPIN ping.
1808 */
1809 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1810 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1811 if (!cmd_p)
1812 return -EINVAL;
1813
1814 iscsit_stop_nopin_response_timer(conn);
1815
1816 cmd_p->i_state = ISTATE_REMOVE;
1817 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1818
1819 iscsit_start_nopin_timer(conn);
1820 return 0;
1821 }
1822 /*
1823 * Otherwise, initiator is not expecting a NOPIN is response.
1824 * Just ignore for now.
1825 */
1a40f0a3
VP		 1826
1827 if (cmd)
1828 iscsit_free_cmd(cmd, false);
1829
778de368
NB		 1830 return 0;
1831}
1832EXPORT_SYMBOL(iscsit_process_nop_out);
1833
1834static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1835 unsigned char *buf)
1836{
1837 unsigned char *ping_data = NULL;
1838 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1839 struct kvec *iov = NULL;
1840 u32 payload_length = ntoh24(hdr->dlength);
1841 int ret;
1842
1843 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1844 if (ret < 0)
561bf158 1845 return 0;
778de368
NB		 1846 /*
1847 * Handle NOP-OUT payload for traditional iSCSI sockets
1848 */
50e5c87d 1849 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1850 u32 checksum, data_crc, padding = 0;
1851 int niov = 0, rx_got, rx_size = payload_length;
1852
e48354ce
NB		 1853 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1854 if (!ping_data) {
e48354ce
NB		 1855 ret = -1;
1856 goto out;
1857 }
1858
1859 iov = &cmd->iov_misc[0];
1860 iov[niov].iov_base = ping_data;
1861 iov[niov++].iov_len = payload_length;
1862
1863 padding = ((-payload_length) & 3);
1864 if (padding != 0) {
1865 pr_debug("Receiving %u additional bytes"
1866 " for padding.\n", padding);
1867 iov[niov].iov_base = &cmd->pad_bytes;
1868 iov[niov++].iov_len = padding;
1869 rx_size += padding;
1870 }
1871 if (conn->conn_ops->DataDigest) {
1872 iov[niov].iov_base = &checksum;
1873 iov[niov++].iov_len = ISCSI_CRC_LEN;
1874 rx_size += ISCSI_CRC_LEN;
1875 }
1876
1877 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1878 if (rx_got != rx_size) {
1879 ret = -1;
1880 goto out;
1881 }
1882
1883 if (conn->conn_ops->DataDigest) {
69110e3c 1884 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
e48354ce
NB		 1885 ping_data, payload_length,
1886 padding, cmd->pad_bytes,
1887 (u8 *)&data_crc);
1888
1889 if (checksum != data_crc) {
1890 pr_err("Ping data CRC32C DataDigest"
1891 " 0x%08x does not match computed 0x%08x\n",
1892 checksum, data_crc);
1893 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1894 pr_err("Unable to recover from"
1895 " NOPOUT Ping DataCRC failure while in"
1896 " ERL=0.\n");
1897 ret = -1;
1898 goto out;
1899 } else {
1900 /*
1901 * Silently drop this PDU and let the
1902 * initiator plug the CmdSN gap.
1903 */
1904 pr_debug("Dropping NOPOUT"
1905 " Command CmdSN: 0x%08x due to"
1906 " DataCRC error.\n", hdr->cmdsn);
1907 ret = 0;
1908 goto out;
1909 }
1910 } else {
1911 pr_debug("Got CRC32C DataDigest"
1912 " 0x%08x for %u bytes of ping data.\n",
1913 checksum, payload_length);
1914 }
1915 }
1916
1917 ping_data[payload_length] = '\0';
1918 /*
1919 * Attach ping data to struct iscsi_cmd->buf_ptr.
1920 */
8359cf43 1921 cmd->buf_ptr = ping_data;
e48354ce
NB		 1922 cmd->buf_ptr_size = payload_length;
1923
1924 pr_debug("Got %u bytes of NOPOUT ping"
1925 " data.\n", payload_length);
1926 pr_debug("Ping Data: \"%s\"\n", ping_data);
1927 }
1928
778de368 1929 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1930out:
1931 if (cmd)
aafc9d15 1932 iscsit_free_cmd(cmd, false);
778de368 1933
e48354ce
NB		 1934 kfree(ping_data);
1935 return ret;
1936}
1937
e381fe9e
BVA		 1938static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1939{
1940 switch (iscsi_tmf) {
1941 case ISCSI_TM_FUNC_ABORT_TASK:
1942 return TMR_ABORT_TASK;
1943 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1944 return TMR_ABORT_TASK_SET;
1945 case ISCSI_TM_FUNC_CLEAR_ACA:
1946 return TMR_CLEAR_ACA;
1947 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1948 return TMR_CLEAR_TASK_SET;
1949 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1950 return TMR_LUN_RESET;
1951 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1952 return TMR_TARGET_WARM_RESET;
1953 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1954 return TMR_TARGET_COLD_RESET;
1955 default:
1956 return TMR_UNKNOWN;
1957 }
1958}
1959
3e1c81a9
NB		 1960int
1961iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1962 unsigned char *buf)
e48354ce 1963{
e48354ce
NB		 1964 struct se_tmr_req *se_tmr;
1965 struct iscsi_tmr_req *tmr_req;
1966 struct iscsi_tm *hdr;
186a9647
NB		 1967 int out_of_order_cmdsn = 0, ret;
1968 bool sess_ref = false;
59b6986d 1969 u8 function, tcm_function = TMR_UNKNOWN;
e48354ce
NB		 1970
1971 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1972 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1973 function = hdr->flags;
1974
1975 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1976 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1977 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1978 hdr->rtt, hdr->refcmdsn, conn->cid);
1979
1980 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1981 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1982 hdr->rtt != RESERVED_ITT)) {
e48354ce 1983 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1984 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1985 }
1986
1987 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1988 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1989 pr_err("Task Management Request TASK_REASSIGN not"
1990 " issued as immediate command, bad iSCSI Initiator"
1991 "implementation\n");
ba159914
NB		 1992 return iscsit_add_reject_cmd(cmd,
1993 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1994 }
1995 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1996 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1997 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1998
d28b1169 1999 cmd->data_direction = DMA_NONE;
3829f381 2000 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
c46e22f1 2001 if (!cmd->tmr_req)
ba159914
NB		 2002 return iscsit_add_reject_cmd(cmd,
2003 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2004 buf);
d28b1169
AG		 2005
2006 /*
2007 * TASK_REASSIGN for ERL=2 / connection stays inside of
2008 * LIO-Target $FABRIC_MOD
2009 */
2010 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
9ac8928e 2011 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
d28b1169 2012 conn->sess->se_sess, 0, DMA_NONE,
68d81f40 2013 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 2014
afc16604 2015 target_get_sess_cmd(&cmd->se_cmd, true);
186a9647 2016 sess_ref = true;
e381fe9e
BVA		 2017 tcm_function = iscsit_convert_tmf(function);
2018 if (tcm_function == TMR_UNKNOWN) {
d28b1169
AG		 2019 pr_err("Unknown iSCSI TMR Function:"
2020 " 0x%02x\n", function);
ba159914
NB		 2021 return iscsit_add_reject_cmd(cmd,
2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2023 }
59b6986d
BVA		 2024 }
2025 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2026 GFP_KERNEL);
2027 if (ret < 0)
2028 return iscsit_add_reject_cmd(cmd,
ba159914 2029 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2030
59b6986d 2031 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
e48354ce
NB		 2032
2033 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2034 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2035 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2036 cmd->init_task_tag = hdr->itt;
2037 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2038 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2039 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2040 se_tmr = cmd->se_cmd.se_tmr_req;
2041 tmr_req = cmd->tmr_req;
2042 /*
2043 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2044 */
2045 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 2046 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2047 scsilun_to_int(&hdr->lun));
e48354ce 2048 if (ret < 0) {
e48354ce
NB		 2049 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2050 goto attach;
2051 }
2052 }
2053
2054 switch (function) {
2055 case ISCSI_TM_FUNC_ABORT_TASK:
2056 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 2057 if (se_tmr->response)
e48354ce 2058 goto attach;
e48354ce
NB		 2059 break;
2060 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2061 case ISCSI_TM_FUNC_CLEAR_ACA:
2062 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2063 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2064 break;
2065 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2066 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2067 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2068 goto attach;
2069 }
2070 break;
2071 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2072 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2073 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2074 goto attach;
2075 }
2076 break;
2077 case ISCSI_TM_FUNC_TASK_REASSIGN:
2078 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2079 /*
2080 * Perform sanity checks on the ExpDataSN only if the
2081 * TASK_REASSIGN was successful.
2082 */
de103c93 2083 if (se_tmr->response)
e48354ce
NB		 2084 break;
2085
2086 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 2087 return iscsit_add_reject_cmd(cmd,
2088 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 2089 break;
2090 default:
2091 pr_err("Unknown TMR function: 0x%02x, protocol"
2092 " error.\n", function);
e48354ce
NB		 2093 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2094 goto attach;
2095 }
2096
2097 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2098 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2099 se_tmr->call_transport = 1;
2100attach:
2101 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2102 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2103 spin_unlock_bh(&conn->cmd_lock);
2104
2105 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 2106 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 2107 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2108 out_of_order_cmdsn = 1;
5a4c8666 2109 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2110 return 0;
5a4c8666 2111 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 2112 return -1;
e48354ce 2113 }
50e5c87d 2114 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 2115
5a4c8666 2116 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 2117 return 0;
2118 /*
2119 * Found the referenced task, send to transport for processing.
2120 */
2121 if (se_tmr->call_transport)
2122 return transport_generic_handle_tmr(&cmd->se_cmd);
2123
2124 /*
2125 * Could not find the referenced LUN, task, or Task Management
2126 * command not authorized or supported. Change state and
2127 * let the tx_thread send the response.
2128 *
2129 * For connection recovery, this is also the default action for
2130 * TMR TASK_REASSIGN.
2131 */
186a9647
NB		 2132 if (sess_ref) {
2133 pr_debug("Handle TMR, using sess_ref=true check\n");
afc16604 2134 target_put_sess_cmd(&cmd->se_cmd);
186a9647
NB		 2135 }
2136
e48354ce
NB		 2137 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2138 return 0;
2139}
3e1c81a9 2140EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 2141
2142/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 2143int
2144iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2145 struct iscsi_text *hdr)
e48354ce 2146{
64534aa7 2147 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 2148
21f5aa7e 2149 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 2150 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 2151 "greater than MaxXmitDataSegmentLength %u.\n",
2152 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 2153 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2154 (unsigned char *)hdr);
e48354ce
NB		 2155 }
2156
122f8afc
NB		 2157 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2158 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2159 pr_err("Multi sequence text commands currently not supported\n");
2160 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2161 (unsigned char *)hdr);
2162 }
2163
e48354ce
NB		 2164 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2165 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2166 hdr->exp_statsn, payload_length);
2167
64534aa7
NB		 2168 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2169 cmd->i_state = ISTATE_SEND_TEXTRSP;
2170 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2171 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2172 cmd->targ_xfer_tag = 0xFFFFFFFF;
2173 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2174 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2175 cmd->data_direction = DMA_NONE;
e4f4e801 2176 cmd->text_in_ptr = NULL;
64534aa7
NB		 2177
2178 return 0;
2179}
2180EXPORT_SYMBOL(iscsit_setup_text_cmd);
2181
2182int
2183iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2184 struct iscsi_text *hdr)
2185{
9864ca9d 2186 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2187 int cmdsn_ret;
2188
9864ca9d 2189 if (!text_in) {
e4f4e801
SG		 2190 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2191 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2192 pr_err("Unable to locate text_in buffer for sendtargets"
2193 " discovery\n");
2194 goto reject;
2195 }
2196 goto empty_sendtargets;
9864ca9d
NB		 2197 }
2198 if (strncmp("SendTargets", text_in, 11) != 0) {
2199 pr_err("Received Text Data that is not"
2200 " SendTargets, cannot continue.\n");
2201 goto reject;
2202 }
2203 text_ptr = strchr(text_in, '=');
2204 if (!text_ptr) {
2205 pr_err("No \"=\" separator found in Text Data,"
2206 " cannot continue.\n");
2207 goto reject;
2208 }
2209 if (!strncmp("=All", text_ptr, 4)) {
8060b8dd 2210 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
6665889c
NB		 2211 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2212 !strncmp("=eui.", text_ptr, 5)) {
8060b8dd 2213 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
9864ca9d
NB		 2214 } else {
2215 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2216 goto reject;
2217 }
2218
64534aa7
NB		 2219 spin_lock_bh(&conn->cmd_lock);
2220 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2221 spin_unlock_bh(&conn->cmd_lock);
2222
e4f4e801 2223empty_sendtargets:
64534aa7
NB		 2224 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2225
2226 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2227 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2228 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2229 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2230 return -1;
2231
64534aa7
NB		 2232 return 0;
2233 }
2234
2235 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2236
2237reject:
ba159914
NB		 2238 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2239 (unsigned char *)hdr);
64534aa7
NB		 2240}
2241EXPORT_SYMBOL(iscsit_process_text_cmd);
2242
2243static int
2244iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2245 unsigned char *buf)
2246{
2247 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2248 char *text_in = NULL;
2249 u32 payload_length = ntoh24(hdr->dlength);
2250 int rx_size, rc;
2251
2252 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2253 if (rc < 0)
561bf158 2254 return 0;
64534aa7
NB		 2255
2256 rx_size = payload_length;
2257 if (payload_length) {
64534aa7
NB		 2258 u32 checksum = 0, data_crc = 0;
2259 u32 padding = 0, pad_bytes = 0;
2260 int niov = 0, rx_got;
2261 struct kvec iov[3];
2262
2263 text_in = kzalloc(payload_length, GFP_KERNEL);
c46e22f1 2264 if (!text_in)
64534aa7 2265 goto reject;
c46e22f1 2266
9864ca9d 2267 cmd->text_in_ptr = text_in;
e48354ce
NB		 2268
2269 memset(iov, 0, 3 * sizeof(struct kvec));
2270 iov[niov].iov_base = text_in;
64534aa7 2271 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2272
2273 padding = ((-payload_length) & 3);
2274 if (padding != 0) {
76f1928e 2275 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2276 iov[niov++].iov_len = padding;
2277 rx_size += padding;
2278 pr_debug("Receiving %u additional bytes"
2279 " for padding.\n", padding);
2280 }
2281 if (conn->conn_ops->DataDigest) {
2282 iov[niov].iov_base = &checksum;
2283 iov[niov++].iov_len = ISCSI_CRC_LEN;
2284 rx_size += ISCSI_CRC_LEN;
2285 }
2286
2287 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2288 if (rx_got != rx_size)
2289 goto reject;
e48354ce
NB		 2290
2291 if (conn->conn_ops->DataDigest) {
69110e3c 2292 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
64534aa7 2293 text_in, payload_length,
76f1928e 2294 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2295 (u8 *)&data_crc);
2296
2297 if (checksum != data_crc) {
2298 pr_err("Text data CRC32C DataDigest"
2299 " 0x%08x does not match computed"
2300 " 0x%08x\n", checksum, data_crc);
2301 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2302 pr_err("Unable to recover from"
2303 " Text Data digest failure while in"
2304 " ERL=0.\n");
64534aa7 2305 goto reject;
e48354ce
NB		 2306 } else {
2307 /*
2308 * Silently drop this PDU and let the
2309 * initiator plug the CmdSN gap.
2310 */
2311 pr_debug("Dropping Text"
2312 " Command CmdSN: 0x%08x due to"
2313 " DataCRC error.\n", hdr->cmdsn);
2314 kfree(text_in);
2315 return 0;
2316 }
2317 } else {
2318 pr_debug("Got CRC32C DataDigest"
2319 " 0x%08x for %u bytes of text data.\n",
64534aa7 2320 checksum, payload_length);
e48354ce
NB		 2321 }
2322 }
64534aa7 2323 text_in[payload_length - 1] = '\0';
e48354ce 2324 pr_debug("Successfully read %d bytes of text"
64534aa7 2325 " data.\n", payload_length);
e48354ce
NB		 2326 }
2327
64534aa7 2328 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2329
64534aa7 2330reject:
9864ca9d
NB		 2331 kfree(cmd->text_in_ptr);
2332 cmd->text_in_ptr = NULL;
ba159914 2333 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 2334}
2335
2336int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2337{
2338 struct iscsi_conn *conn_p;
2339 struct iscsi_session *sess = conn->sess;
2340
2341 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2342 " for SID: %u.\n", conn->cid, conn->sess->sid);
2343
2344 atomic_set(&sess->session_logout, 1);
2345 atomic_set(&conn->conn_logout_remove, 1);
2346 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2347
2348 iscsit_inc_conn_usage_count(conn);
2349 iscsit_inc_session_usage_count(sess);
2350
2351 spin_lock_bh(&sess->conn_lock);
2352 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2353 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2354 continue;
2355
2356 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2357 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2358 }
2359 spin_unlock_bh(&sess->conn_lock);
2360
2361 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2362
2363 return 0;
2364}
2365
2366int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2367{
2368 struct iscsi_conn *l_conn;
2369 struct iscsi_session *sess = conn->sess;
2370
2371 pr_debug("Received logout request CLOSECONNECTION for CID:"
2372 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2373
2374 /*
2375 * A Logout Request with a CLOSECONNECTION reason code for a CID
2376 * can arrive on a connection with a differing CID.
2377 */
2378 if (conn->cid == cmd->logout_cid) {
2379 spin_lock_bh(&conn->state_lock);
2380 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2381 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2382
2383 atomic_set(&conn->conn_logout_remove, 1);
2384 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2385 iscsit_inc_conn_usage_count(conn);
2386
2387 spin_unlock_bh(&conn->state_lock);
2388 } else {
2389 /*
2390 * Handle all different cid CLOSECONNECTION requests in
2391 * iscsit_logout_post_handler_diffcid() as to give enough
2392 * time for any non immediate command's CmdSN to be
2393 * acknowledged on the connection in question.
2394 *
2395 * Here we simply make sure the CID is still around.
2396 */
2397 l_conn = iscsit_get_conn_from_cid(sess,
2398 cmd->logout_cid);
2399 if (!l_conn) {
2400 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2401 iscsit_add_cmd_to_response_queue(cmd, conn,
2402 cmd->i_state);
2403 return 0;
2404 }
2405
2406 iscsit_dec_conn_usage_count(l_conn);
2407 }
2408
2409 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410
2411 return 0;
2412}
2413
2414int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2415{
2416 struct iscsi_session *sess = conn->sess;
2417
2418 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2419 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2420
2421 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2422 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2423 " while ERL!=2.\n");
2424 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2425 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426 return 0;
2427 }
2428
2429 if (conn->cid == cmd->logout_cid) {
2430 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431 " with CID: %hu on CID: %hu, implementation error.\n",
2432 cmd->logout_cid, conn->cid);
2433 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2434 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2435 return 0;
2436 }
2437
2438 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439
2440 return 0;
2441}
2442
3e1c81a9
NB		 2443int
2444iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2445 unsigned char *buf)
e48354ce
NB		 2446{
2447 int cmdsn_ret, logout_remove = 0;
2448 u8 reason_code = 0;
e48354ce
NB		 2449 struct iscsi_logout *hdr;
2450 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2451
2452 hdr = (struct iscsi_logout *) buf;
2453 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2454
2455 if (tiqn) {
2456 spin_lock(&tiqn->logout_stats.lock);
2457 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2458 tiqn->logout_stats.normal_logouts++;
2459 else
2460 tiqn->logout_stats.abnormal_logouts++;
2461 spin_unlock(&tiqn->logout_stats.lock);
2462 }
2463
2464 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2465 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2466 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2467 hdr->cid, conn->cid);
2468
2469 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2470 pr_err("Received logout request on connection that"
2471 " is not in logged in state, ignoring request.\n");
aafc9d15 2472 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2473 return 0;
2474 }
2475
e48354ce
NB		 2476 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2477 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2478 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2479 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2480 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2481 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2482 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2483 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2484 cmd->logout_reason = reason_code;
2485 cmd->data_direction = DMA_NONE;
2486
2487 /*
2488 * We need to sleep in these cases (by returning 1) until the Logout
2489 * Response gets sent in the tx thread.
2490 */
2491 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2492 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2493 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2494 logout_remove = 1;
2495
2496 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2497 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2498 spin_unlock_bh(&conn->cmd_lock);
2499
2500 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2501 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2502
2503 /*
2504 * Immediate commands are executed, well, immediately.
2505 * Non-Immediate Logout Commands are executed in CmdSN order.
2506 */
c6037cc5 2507 if (cmd->immediate_cmd) {
e48354ce
NB		 2508 int ret = iscsit_execute_cmd(cmd, 0);
2509
2510 if (ret < 0)
2511 return ret;
2512 } else {
561bf158 2513 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2514 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2515 logout_remove = 0;
ba159914
NB		 2516 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2517 return -1;
e48354ce
NB		 2518 }
2519
2520 return logout_remove;
2521}
3e1c81a9 2522EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce 2523
d2faaefb 2524int iscsit_handle_snack(
e48354ce
NB		 2525 struct iscsi_conn *conn,
2526 unsigned char *buf)
2527{
e48354ce
NB		 2528 struct iscsi_snack *hdr;
2529
2530 hdr = (struct iscsi_snack *) buf;
2531 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2532
2533 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2534 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2535 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2536 hdr->begrun, hdr->runlength, conn->cid);
2537
2538 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2539 pr_err("Initiator sent SNACK request while in"
2540 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2541 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2542 buf);
e48354ce
NB		 2543 }
2544 /*
2545 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2546 * call from inside iscsi_send_recovery_datain_or_r2t().
2547 */
2548 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2549 case 0:
2550 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2551 hdr->itt,
2552 be32_to_cpu(hdr->ttt),
2553 be32_to_cpu(hdr->begrun),
2554 be32_to_cpu(hdr->runlength));
e48354ce 2555 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2556 return iscsit_handle_status_snack(conn, hdr->itt,
2557 be32_to_cpu(hdr->ttt),
2558 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2559 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2560 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2561 be32_to_cpu(hdr->begrun),
2562 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2563 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2564 /* FIXME: Support R-Data SNACK */
2565 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2566 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2567 buf);
e48354ce
NB		 2568 default:
2569 pr_err("Unknown SNACK type 0x%02x, protocol"
2570 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572 buf);
e48354ce
NB		 2573 }
2574
2575 return 0;
2576}
d2faaefb 2577EXPORT_SYMBOL(iscsit_handle_snack);
e48354ce
NB		 2578
2579static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2580{
2581 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2582 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2583 wait_for_completion_interruptible_timeout(
2584 &conn->rx_half_close_comp,
2585 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2586 }
2587}
2588
2589static int iscsit_handle_immediate_data(
2590 struct iscsi_cmd *cmd,
3e1c81a9 2591 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2592 u32 length)
2593{
2594 int iov_ret, rx_got = 0, rx_size = 0;
2595 u32 checksum, iov_count = 0, padding = 0;
2596 struct iscsi_conn *conn = cmd->conn;
2597 struct kvec *iov;
2598
2599 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2600 if (iov_ret < 0)
2601 return IMMEDIATE_DATA_CANNOT_RECOVER;
2602
2603 rx_size = length;
2604 iov_count = iov_ret;
2605 iov = &cmd->iov_data[0];
2606
2607 padding = ((-length) & 3);
2608 if (padding != 0) {
2609 iov[iov_count].iov_base = cmd->pad_bytes;
2610 iov[iov_count++].iov_len = padding;
2611 rx_size += padding;
2612 }
2613
2614 if (conn->conn_ops->DataDigest) {
2615 iov[iov_count].iov_base = &checksum;
2616 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2617 rx_size += ISCSI_CRC_LEN;
2618 }
2619
2620 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2621
2622 iscsit_unmap_iovec(cmd);
2623
2624 if (rx_got != rx_size) {
2625 iscsit_rx_thread_wait_for_tcp(conn);
2626 return IMMEDIATE_DATA_CANNOT_RECOVER;
2627 }
2628
2629 if (conn->conn_ops->DataDigest) {
2630 u32 data_crc;
2631
69110e3c 2632 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
e48354ce
NB		 2633 cmd->write_data_done, length, padding,
2634 cmd->pad_bytes);
2635
2636 if (checksum != data_crc) {
2637 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2638 " does not match computed 0x%08x\n", checksum,
2639 data_crc);
2640
2641 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2642 pr_err("Unable to recover from"
2643 " Immediate Data digest failure while"
2644 " in ERL=0.\n");
ba159914 2645 iscsit_reject_cmd(cmd,
e48354ce 2646 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2647 (unsigned char *)hdr);
e48354ce
NB		 2648 return IMMEDIATE_DATA_CANNOT_RECOVER;
2649 } else {
ba159914 2650 iscsit_reject_cmd(cmd,
e48354ce 2651 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2652 (unsigned char *)hdr);
e48354ce
NB		 2653 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2654 }
2655 } else {
2656 pr_debug("Got CRC32C DataDigest 0x%08x for"
2657 " %u bytes of Immediate Data\n", checksum,
2658 length);
2659 }
2660 }
2661
2662 cmd->write_data_done += length;
2663
ebf1d95c 2664 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2665 spin_lock_bh(&cmd->istate_lock);
2666 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2667 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2668 spin_unlock_bh(&cmd->istate_lock);
2669 }
2670
2671 return IMMEDIATE_DATA_NORMAL_OPERATION;
2672}
2673
2674/*
2675 * Called with sess->conn_lock held.
2676 */
2677/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2678 with active network interface */
2679static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2680{
2681 struct iscsi_cmd *cmd;
2682 struct iscsi_conn *conn_p;
d444edc6 2683 bool found = false;
e48354ce
NB		 2684
2685 /*
2686 * Only send a Asynchronous Message on connections whos network
2687 * interface is still functional.
2688 */
2689 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2690 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2691 iscsit_inc_conn_usage_count(conn_p);
d444edc6 2692 found = true;
e48354ce
NB		 2693 break;
2694 }
2695 }
2696
d444edc6 2697 if (!found)
e48354ce
NB		 2698 return;
2699
676687c6 2700 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2701 if (!cmd) {
2702 iscsit_dec_conn_usage_count(conn_p);
2703 return;
2704 }
2705
2706 cmd->logout_cid = conn->cid;
2707 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2708 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2709
2710 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2711 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2712 spin_unlock_bh(&conn_p->cmd_lock);
2713
2714 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2715 iscsit_dec_conn_usage_count(conn_p);
2716}
2717
2718static int iscsit_send_conn_drop_async_message(
2719 struct iscsi_cmd *cmd,
2720 struct iscsi_conn *conn)
2721{
2722 struct iscsi_async *hdr;
2723
e48354ce
NB		 2724 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2725
2726 hdr = (struct iscsi_async *) cmd->pdu;
2727 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2728 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2729 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2730 cmd->targ_xfer_tag = 0xFFFFFFFF;
2731 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2732 cmd->stat_sn = conn->stat_sn++;
2733 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2734 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2735 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 2736 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2737 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2738 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2739 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2740
e48354ce
NB		 2741 pr_debug("Sending Connection Dropped Async Message StatSN:"
2742 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2743 cmd->logout_cid, conn->cid);
2854bb23
VP		 2744
2745 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2746}
2747
6f3c0e69
AG		 2748static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2749{
2750 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2751 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2752 wait_for_completion_interruptible_timeout(
2753 &conn->tx_half_close_comp,
2754 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2755 }
2756}
2757
d2faaefb 2758void
2ec5a8c1
NB		 2759iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2761 bool set_statsn)
e48354ce 2762{
2ec5a8c1
NB		 2763 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2764 hdr->flags = datain->flags;
2765 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2766 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2767 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2768 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2769 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2770 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2771 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2772 }
2773 }
2774 hton24(hdr->dlength, datain->length);
2775 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2776 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2777 (struct scsi_lun *)&hdr->lun);
2778 else
2779 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2780
2781 hdr->itt = cmd->init_task_tag;
2782
2783 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2784 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2785 else
2786 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2787 if (set_statsn)
2788 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2789 else
2790 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2791
2792 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2793 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2794 hdr->datasn = cpu_to_be32(datain->data_sn);
2795 hdr->offset = cpu_to_be32(datain->offset);
2796
2797 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2798 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2799 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2800 ntohl(hdr->offset), datain->length, conn->cid);
2801}
d2faaefb 2802EXPORT_SYMBOL(iscsit_build_datain_pdu);
2ec5a8c1
NB		 2803
2804static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2805{
2806 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2807 struct iscsi_datain datain;
2808 struct iscsi_datain_req *dr;
2854bb23 2809 int eodr = 0, ret;
2ec5a8c1 2810 bool set_statsn = false;
e48354ce
NB		 2811
2812 memset(&datain, 0, sizeof(struct iscsi_datain));
2813 dr = iscsit_get_datain_values(cmd, &datain);
2814 if (!dr) {
2815 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2816 cmd->init_task_tag);
2817 return -1;
2818 }
e48354ce
NB		 2819 /*
2820 * Be paranoid and double check the logic for now.
2821 */
ebf1d95c 2822 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2823 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2824 " datain.length: %u exceeds cmd->data_length: %u\n",
2825 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2826 cmd->se_cmd.data_length);
e48354ce
NB		 2827 return -1;
2828 }
2829
04f3b31b 2830 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2831 /*
2832 * Special case for successfully execution w/ both DATAIN
2833 * and Sense Data.
2834 */
2835 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2836 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2837 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2838 else {
2839 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2840 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2841 iscsit_increment_maxcmdsn(cmd, conn->sess);
2842 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2843 set_statsn = true;
e48354ce 2844 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2845 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2846 set_statsn = true;
e48354ce
NB		 2847 }
2848
2ec5a8c1 2849 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce 2850
2854bb23
VP		 2851 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2852 if (ret < 0)
6f3c0e69 2853 return ret;
6f3c0e69 2854
e48354ce 2855 if (dr->dr_complete) {
6f3c0e69 2856 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2857 2 : 1;
2858 iscsit_free_datain_req(cmd, dr);
2859 }
2860
6f3c0e69 2861 return eodr;
e48354ce
NB		 2862}
2863
2ec5a8c1
NB		 2864int
2865iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2866 struct iscsi_logout_rsp *hdr)
e48354ce 2867{
e48354ce
NB		 2868 struct iscsi_conn *logout_conn = NULL;
2869 struct iscsi_conn_recovery *cr = NULL;
2870 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2871 /*
2872 * The actual shutting down of Sessions and/or Connections
2873 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2874 * is done in scsi_logout_post_handler().
2875 */
2876 switch (cmd->logout_reason) {
2877 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2878 pr_debug("iSCSI session logout successful, setting"
2879 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2880 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2881 break;
2882 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2883 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2884 break;
2885 /*
2886 * For CLOSECONNECTION logout requests carrying
2887 * a matching logout CID -> local CID, the reference
2888 * for the local CID will have been incremented in
2889 * iscsi_logout_closeconnection().
2890 *
2891 * For CLOSECONNECTION logout requests carrying
2892 * a different CID than the connection it arrived
2893 * on, the connection responding to cmd->logout_cid
2894 * is stopped in iscsit_logout_post_handler_diffcid().
2895 */
2896
2897 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2898 " successful.\n", cmd->logout_cid, conn->cid);
2899 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2900 break;
2901 case ISCSI_LOGOUT_REASON_RECOVERY:
2902 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2903 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2904 break;
2905 /*
2906 * If the connection is still active from our point of view
2907 * force connection recovery to occur.
2908 */
2909 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2910 cmd->logout_cid);
ee1b1b9c 2911 if (logout_conn) {
e48354ce
NB		 2912 iscsit_connection_reinstatement_rcfr(logout_conn);
2913 iscsit_dec_conn_usage_count(logout_conn);
2914 }
2915
2916 cr = iscsit_get_inactive_connection_recovery_entry(
2917 conn->sess, cmd->logout_cid);
2918 if (!cr) {
2919 pr_err("Unable to locate CID: %hu for"
2920 " REMOVECONNFORRECOVERY Logout Request.\n",
2921 cmd->logout_cid);
2922 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2923 break;
2924 }
2925
2926 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2927
2928 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2929 " for recovery for CID: %hu on CID: %hu successful.\n",
2930 cmd->logout_cid, conn->cid);
2931 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2932 break;
2933 default:
2934 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2935 cmd->logout_reason);
2936 return -1;
2937 }
2938
e48354ce
NB		 2939 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2940 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2941 hdr->response = cmd->logout_response;
66c7db68 2942 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2943 cmd->stat_sn = conn->stat_sn++;
2944 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2945
2946 iscsit_increment_maxcmdsn(cmd, conn->sess);
2947 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2948 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 2949
2ec5a8c1
NB		 2950 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2951 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2952 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2953 cmd->logout_cid, conn->cid);
2954
2955 return 0;
2956}
2957EXPORT_SYMBOL(iscsit_build_logout_rsp);
2958
2959static int
2960iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2961{
2854bb23 2962 int rc;
2ec5a8c1
NB		 2963
2964 rc = iscsit_build_logout_rsp(cmd, conn,
2965 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2966 if (rc < 0)
2967 return rc;
2968
2854bb23 2969 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2970}
2971
2ec5a8c1
NB		 2972void
2973iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2974 struct iscsi_nopin *hdr, bool nopout_response)
2975{
2976 hdr->opcode = ISCSI_OP_NOOP_IN;
2977 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2978 hton24(hdr->dlength, cmd->buf_ptr_size);
2979 if (nopout_response)
2980 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2981 hdr->itt = cmd->init_task_tag;
2982 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2983 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2984 conn->stat_sn;
2985 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2986
2987 if (nopout_response)
2988 iscsit_increment_maxcmdsn(cmd, conn->sess);
2989
2990 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2991 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2992
2993 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2994 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3fc6a642 2995 "Solicited" : "Unsolicited", cmd->init_task_tag,
2ec5a8c1
NB		 2996 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2997}
2998EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2999
e48354ce
NB		 3000/*
3001 * Unsolicited NOPIN, either requesting a response or not.
3002 */
3003static int iscsit_send_unsolicited_nopin(
3004 struct iscsi_cmd *cmd,
3005 struct iscsi_conn *conn,
3006 int want_response)
3007{
2ec5a8c1 3008 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2854bb23 3009 int ret;
e48354ce 3010
2ec5a8c1 3011 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce 3012
e48354ce
NB		 3013 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3014 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3015
2854bb23
VP		 3016 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3017 if (ret < 0)
6f3c0e69 3018 return ret;
6f3c0e69
AG		 3019
3020 spin_lock_bh(&cmd->istate_lock);
3021 cmd->i_state = want_response ?
3022 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3023 spin_unlock_bh(&cmd->istate_lock);
3024
e48354ce
NB		 3025 return 0;
3026}
3027
2ec5a8c1
NB		 3028static int
3029iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 3030{
2ec5a8c1 3031 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 3032
2ec5a8c1 3033 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 3034
e48354ce
NB		 3035 /*
3036 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3037 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3038 */
2854bb23 3039 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
e48354ce 3040
2854bb23
VP		 3041 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3042 cmd->buf_ptr,
3043 cmd->buf_ptr_size);
e48354ce
NB		 3044}
3045
6f3c0e69 3046static int iscsit_send_r2t(
e48354ce
NB		 3047 struct iscsi_cmd *cmd,
3048 struct iscsi_conn *conn)
3049{
e48354ce
NB		 3050 struct iscsi_r2t *r2t;
3051 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3052 int ret;
e48354ce
NB		 3053
3054 r2t = iscsit_get_r2t_from_list(cmd);
3055 if (!r2t)
3056 return -1;
3057
3058 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3059 memset(hdr, 0, ISCSI_HDR_LEN);
3060 hdr->opcode = ISCSI_OP_R2T;
3061 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3062 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3063 (struct scsi_lun *)&hdr->lun);
66c7db68 3064 hdr->itt = cmd->init_task_tag;
8567270d
VP		 3065 if (conn->conn_transport->iscsit_get_r2t_ttt)
3066 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3067 else
3068 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
e48354ce
NB		 3069 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3070 hdr->statsn = cpu_to_be32(conn->stat_sn);
3071 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3072 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 3073 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3074 hdr->data_offset = cpu_to_be32(r2t->offset);
3075 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3076
e48354ce
NB		 3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081 r2t->offset, r2t->xfer_len, conn->cid);
3082
e48354ce
NB		 3083 spin_lock_bh(&cmd->r2t_lock);
3084 r2t->sent_r2t = 1;
3085 spin_unlock_bh(&cmd->r2t_lock);
3086
2854bb23 3087 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
6f3c0e69 3088 if (ret < 0) {
6f3c0e69
AG		 3089 return ret;
3090 }
3091
3092 spin_lock_bh(&cmd->dataout_timeout_lock);
3093 iscsit_start_dataout_timer(cmd, conn);
3094 spin_unlock_bh(&cmd->dataout_timeout_lock);
3095
e48354ce
NB		 3096 return 0;
3097}
3098
3099/*
8b1e1244
AG		 3100 * @recovery: If called from iscsi_task_reassign_complete_write() for
3101 * connection recovery.
e48354ce
NB		 3102 */
3103int iscsit_build_r2ts_for_cmd(
e48354ce 3104 struct iscsi_conn *conn,
3e1c81a9 3105 struct iscsi_cmd *cmd,
8b1e1244 3106 bool recovery)
e48354ce
NB		 3107{
3108 int first_r2t = 1;
3109 u32 offset = 0, xfer_len = 0;
3110
3111 spin_lock_bh(&cmd->r2t_lock);
3112 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113 spin_unlock_bh(&cmd->r2t_lock);
3114 return 0;
3115 }
3116
8b1e1244
AG		 3117 if (conn->sess->sess_ops->DataSequenceInOrder &&
3118 !recovery)
c6037cc5 3119 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3120
3121 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123 offset = cmd->r2t_offset;
3124
8b1e1244
AG		 3125 if (first_r2t && recovery) {
3126 int new_data_end = offset +
3127 conn->sess->sess_ops->MaxBurstLength -
3128 cmd->next_burst_len;
3129
ebf1d95c
AG		 3130 if (new_data_end > cmd->se_cmd.data_length)
3131 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3132 else
3133 xfer_len =
3134 conn->sess->sess_ops->MaxBurstLength -
3135 cmd->next_burst_len;
e48354ce 3136 } else {
8b1e1244
AG		 3137 int new_data_end = offset +
3138 conn->sess->sess_ops->MaxBurstLength;
3139
ebf1d95c
AG		 3140 if (new_data_end > cmd->se_cmd.data_length)
3141 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3142 else
3143 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3144 }
3145 cmd->r2t_offset += xfer_len;
3146
ebf1d95c 3147 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3148 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3149 } else {
3150 struct iscsi_seq *seq;
3151
3152 seq = iscsit_get_seq_holder_for_r2t(cmd);
3153 if (!seq) {
3154 spin_unlock_bh(&cmd->r2t_lock);
3155 return -1;
3156 }
3157
3158 offset = seq->offset;
3159 xfer_len = seq->xfer_len;
3160
3161 if (cmd->seq_send_order == cmd->seq_count)
3162 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163 }
3164 cmd->outstanding_r2ts++;
3165 first_r2t = 0;
3166
3167 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168 spin_unlock_bh(&cmd->r2t_lock);
3169 return -1;
3170 }
3171
3172 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173 break;
3174 }
3175 spin_unlock_bh(&cmd->r2t_lock);
3176
3177 return 0;
3178}
d2faaefb 3179EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
e48354ce 3180
2ec5a8c1
NB		 3181void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3182 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3183{
2ec5a8c1 3184 if (inc_stat_sn)
e48354ce
NB		 3185 cmd->stat_sn = conn->stat_sn++;
3186
04f3b31b 3187 atomic_long_inc(&conn->sess->rsp_pdus);
e48354ce 3188
e48354ce
NB		 3189 memset(hdr, 0, ISCSI_HDR_LEN);
3190 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3191 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3192 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3193 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3194 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3195 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3196 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3197 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3198 }
3199 hdr->response = cmd->iscsi_response;
3200 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3201 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3202 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3203
3204 iscsit_increment_maxcmdsn(cmd, conn->sess);
3205 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3206 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3207
2ec5a8c1
NB		 3208 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3209 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3210 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3211 cmd->se_cmd.scsi_status, conn->cid);
3212}
3213EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3214
3215static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3216{
3217 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
2ec5a8c1 3218 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
2854bb23
VP		 3219 void *data_buf = NULL;
3220 u32 padding = 0, data_buf_len = 0;
2ec5a8c1
NB		 3221
3222 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3223
e48354ce
NB		 3224 /*
3225 * Attach SENSE DATA payload to iSCSI Response PDU
3226 */
3227 if (cmd->se_cmd.sense_buffer &&
3228 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3229 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3230 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3231 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3232
e48354ce 3233 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3234 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2854bb23
VP		 3235 data_buf = cmd->sense_buffer;
3236 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
e48354ce
NB		 3237
3238 if (padding) {
9c58b7dd 3239 memset(cmd->sense_buffer +
e48354ce 3240 cmd->se_cmd.scsi_sense_length, 0, padding);
e48354ce
NB		 3241 pr_debug("Adding %u bytes of padding to"
3242 " SENSE.\n", padding);
3243 }
3244
e48354ce
NB		 3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3246 " Response PDU\n",
3247 cmd->se_cmd.scsi_sense_length);
3248 }
3249
2854bb23
VP		 3250 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3251 data_buf_len);
e48354ce
NB		 3252}
3253
3254static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3255{
3256 switch (se_tmr->response) {
3257 case TMR_FUNCTION_COMPLETE:
3258 return ISCSI_TMF_RSP_COMPLETE;
3259 case TMR_TASK_DOES_NOT_EXIST:
3260 return ISCSI_TMF_RSP_NO_TASK;
3261 case TMR_LUN_DOES_NOT_EXIST:
3262 return ISCSI_TMF_RSP_NO_LUN;
3263 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3264 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3265 case TMR_FUNCTION_REJECTED:
3266 default:
3267 return ISCSI_TMF_RSP_REJECTED;
3268 }
3269}
3270
2ec5a8c1
NB		 3271void
3272iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3273 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3274{
3275 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3276
e48354ce 3277 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3278 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3279 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3280 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3281 cmd->stat_sn = conn->stat_sn++;
3282 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3283
3284 iscsit_increment_maxcmdsn(cmd, conn->sess);
3285 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3286 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3287
2ec5a8c1
NB		 3288 pr_debug("Built Task Management Response ITT: 0x%08x,"
3289 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3290 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3291}
3292EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3293
3294static int
3295iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3296{
3297 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
2ec5a8c1
NB		 3298
3299 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3300
2854bb23 3301 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 3302}
3303
2f9bc894
NB		 3304static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3305{
3306 bool ret = false;
3307
3308 if (np->np_sockaddr.ss_family == AF_INET6) {
3309 const struct sockaddr_in6 sin6 = {
3310 .sin6_addr = IN6ADDR_ANY_INIT };
3311 struct sockaddr_in6 *sock_in6 =
3312 (struct sockaddr_in6 *)&np->np_sockaddr;
3313
3314 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3315 sin6.sin6_addr.s6_addr, 16))
3316 ret = true;
3317 } else {
3318 struct sockaddr_in * sock_in =
3319 (struct sockaddr_in *)&np->np_sockaddr;
3320
cea0b4ce 3321 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3322 ret = true;
3323 }
3324
3325 return ret;
3326}
3327
8b1e1244
AG		 3328#define SENDTARGETS_BUF_LIMIT 32768U
3329
22c7aaa5
SG		 3330static int
3331iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
e4f4e801
SG		 3332 enum iscsit_transport_type network_transport,
3333 int skip_bytes, bool *completed)
e48354ce
NB		 3334{
3335 char *payload = NULL;
3336 struct iscsi_conn *conn = cmd->conn;
3337 struct iscsi_portal_group *tpg;
3338 struct iscsi_tiqn *tiqn;
3339 struct iscsi_tpg_np *tpg_np;
3340 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3341 int target_name_printed;
8b1e1244 3342 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3343 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
a6415cdd 3344 bool active;
e48354ce 3345
be7dcfb6 3346 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
8b1e1244 3347 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3348
3349 payload = kzalloc(buffer_len, GFP_KERNEL);
c46e22f1 3350 if (!payload)
e48354ce 3351 return -ENOMEM;
c46e22f1 3352
6665889c 3353 /*
8060b8dd 3354 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
6665889c
NB		 3355 * explicit case..
3356 */
8060b8dd 3357 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
6665889c
NB		 3358 text_ptr = strchr(text_in, '=');
3359 if (!text_ptr) {
3360 pr_err("Unable to locate '=' string in text_in:"
3361 " %s\n", text_in);
4f45d320 3362 kfree(payload);
6665889c
NB		 3363 return -EINVAL;
3364 }
3365 /*
3366 * Skip over '=' character..
3367 */
3368 text_ptr += 1;
3369 }
e48354ce
NB		 3370
3371 spin_lock(&tiqn_lock);
3372 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
8060b8dd 3373 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
6665889c
NB		 3374 strcmp(tiqn->tiqn, text_ptr)) {
3375 continue;
3376 }
3377
2dd1d53f 3378 target_name_printed = 0;
e48354ce
NB		 3379
3380 spin_lock(&tiqn->tiqn_tpg_lock);
3381 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3382
2dd1d53f
TG		 3383 /* If demo_mode_discovery=0 and generate_node_acls=0
3384 * (demo mode dislabed) do not return
3385 * TargetName+TargetAddress unless a NodeACL exists.
3386 */
3387
3388 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3389 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
21aaa23b 3390 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
2dd1d53f
TG		 3391 cmd->conn->sess->sess_ops->InitiatorName))) {
3392 continue;
3393 }
3394
e48354ce 3395 spin_lock(&tpg->tpg_state_lock);
a6415cdd 3396 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
e48354ce
NB		 3397 spin_unlock(&tpg->tpg_state_lock);
3398
a6415cdd
DD		 3399 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3400 continue;
3401
e48354ce
NB		 3402 spin_lock(&tpg->tpg_np_lock);
3403 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3404 tpg_np_list) {
2f9bc894
NB		 3405 struct iscsi_np *np = tpg_np->tpg_np;
3406 bool inaddr_any = iscsit_check_inaddr_any(np);
13a3cf08 3407 struct sockaddr_storage *sockaddr;
2f9bc894 3408
22c7aaa5
SG		 3409 if (np->np_network_transport != network_transport)
3410 continue;
3411
2dd1d53f
TG		 3412 if (!target_name_printed) {
3413 len = sprintf(buf, "TargetName=%s",
3414 tiqn->tiqn);
3415 len += 1;
3416
3417 if ((len + payload_len) > buffer_len) {
3418 spin_unlock(&tpg->tpg_np_lock);
3419 spin_unlock(&tiqn->tiqn_tpg_lock);
3420 end_of_buf = 1;
3421 goto eob;
3422 }
e4f4e801
SG		 3423
3424 if (skip_bytes && len <= skip_bytes) {
3425 skip_bytes -= len;
3426 } else {
3427 memcpy(payload + payload_len, buf, len);
3428 payload_len += len;
3429 target_name_printed = 1;
3430 if (len > skip_bytes)
3431 skip_bytes = 0;
3432 }
2dd1d53f
TG		 3433 }
3434
69d75574
AG		 3435 if (inaddr_any)
3436 sockaddr = &conn->local_sockaddr;
1997e625 3437 else
69d75574 3438 sockaddr = &np->np_sockaddr;
1997e625 3439
69d75574
AG		 3440 len = sprintf(buf, "TargetAddress="
3441 "%pISpc,%hu",
3442 sockaddr,
3443 tpg->tpgt);
e48354ce
NB		 3444 len += 1;
3445
3446 if ((len + payload_len) > buffer_len) {
3447 spin_unlock(&tpg->tpg_np_lock);
3448 spin_unlock(&tiqn->tiqn_tpg_lock);
3449 end_of_buf = 1;
3450 goto eob;
3451 }
e4f4e801
SG		 3452
3453 if (skip_bytes && len <= skip_bytes) {
3454 skip_bytes -= len;
3455 } else {
3456 memcpy(payload + payload_len, buf, len);
3457 payload_len += len;
3458 if (len > skip_bytes)
3459 skip_bytes = 0;
3460 }
e48354ce
NB		 3461 }
3462 spin_unlock(&tpg->tpg_np_lock);
3463 }
3464 spin_unlock(&tiqn->tiqn_tpg_lock);
3465eob:
e4f4e801
SG		 3466 if (end_of_buf) {
3467 *completed = false;
e48354ce 3468 break;
e4f4e801 3469 }
6665889c 3470
8060b8dd 3471 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
6665889c 3472 break;
e48354ce
NB		 3473 }
3474 spin_unlock(&tiqn_lock);
3475
3476 cmd->buf_ptr = payload;
3477
3478 return payload_len;
3479}
3480
889c8a68
NB		 3481int
3482iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
22c7aaa5
SG		 3483 struct iscsi_text_rsp *hdr,
3484 enum iscsit_transport_type network_transport)
e48354ce 3485{
889c8a68 3486 int text_length, padding;
e4f4e801 3487 bool completed = true;
e48354ce 3488
e4f4e801
SG		 3489 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3490 cmd->read_data_done,
3491 &completed);
e48354ce
NB		 3492 if (text_length < 0)
3493 return text_length;
3494
e4f4e801
SG		 3495 if (completed) {
3496 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3497 } else {
3498 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3499 cmd->read_data_done += text_length;
3500 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3501 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3502 }
889c8a68 3503 hdr->opcode = ISCSI_OP_TEXT_RSP;
e48354ce 3504 padding = ((-text_length) & 3);
e48354ce 3505 hton24(hdr->dlength, text_length);
889c8a68
NB		 3506 hdr->itt = cmd->init_task_tag;
3507 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3508 cmd->stat_sn = conn->stat_sn++;
3509 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3510
3511 iscsit_increment_maxcmdsn(cmd, conn->sess);
e4f4e801
SG		 3512 /*
3513 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3514 * correctly increment MaxCmdSN for each response answering a
3515 * non immediate text request with a valid CmdSN.
3516 */
3517 cmd->maxcmdsn_inc = 0;
889c8a68 3518 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3519 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3520
e4f4e801
SG		 3521 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3522 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3523 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3524 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3525 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
889c8a68
NB		 3526
3527 return text_length + padding;
3528}
3529EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3530
889c8a68
NB		 3531static int iscsit_send_text_rsp(
3532 struct iscsi_cmd *cmd,
3533 struct iscsi_conn *conn)
3534{
3535 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
2854bb23 3536 int text_length;
e48354ce 3537
864e504a
VP		 3538 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3539 conn->conn_transport->transport_type);
2854bb23
VP		 3540 if (text_length < 0)
3541 return text_length;
e48354ce 3542
2854bb23
VP		 3543 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3544 cmd->buf_ptr,
3545 text_length);
e48354ce
NB		 3546}
3547
2ec5a8c1
NB		 3548void
3549iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3550 struct iscsi_reject *hdr)
3551{
3552 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3553 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3554 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3555 hton24(hdr->dlength, ISCSI_HDR_LEN);
3556 hdr->ffffffff = cpu_to_be32(0xffffffff);
3557 cmd->stat_sn = conn->stat_sn++;
3558 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3559 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3560 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 3561
3562}
3563EXPORT_SYMBOL(iscsit_build_reject);
3564
e48354ce
NB		 3565static int iscsit_send_reject(
3566 struct iscsi_cmd *cmd,
3567 struct iscsi_conn *conn)
3568{
bfbdb31d 3569 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3570
bfbdb31d 3571 iscsit_build_reject(cmd, conn, hdr);
e48354ce 3572
e48354ce
NB		 3573 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3574 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3575
2854bb23
VP		 3576 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3577 cmd->buf_ptr,
3578 ISCSI_HDR_LEN);
e48354ce
NB		 3579}
3580
e48354ce
NB		 3581void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3582{
e48354ce
NB		 3583 int ord, cpu;
3584 /*
88dcd2da
NB		 3585 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3586 * within iscsit_start_kthreads()
e48354ce 3587 *
88dcd2da
NB		 3588 * Here we use bitmap_id to determine which CPU that this
3589 * iSCSI connection's RX/TX threads will be scheduled to
e48354ce
NB		 3590 * execute upon.
3591 */
88dcd2da 3592 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3593 for_each_online_cpu(cpu) {
3594 if (ord-- == 0) {
3595 cpumask_set_cpu(cpu, conn->conn_cpumask);
3596 return;
3597 }
3598 }
3599 /*
3600 * This should never be reached..
3601 */
3602 dump_stack();
3603 cpumask_setall(conn->conn_cpumask);
3604}
3605
d2faaefb 3606int
2ec5a8c1 3607iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3608{
6f3c0e69
AG		 3609 int ret;
3610
2ec5a8c1
NB		 3611 switch (state) {
3612 case ISTATE_SEND_R2T:
3613 ret = iscsit_send_r2t(cmd, conn);
3614 if (ret < 0)
3615 goto err;
3616 break;
3617 case ISTATE_REMOVE:
3618 spin_lock_bh(&conn->cmd_lock);
5159d763 3619 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3620 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3621
aafc9d15 3622 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3623 break;
3624 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3625 iscsit_mod_nopin_response_timer(conn);
3626 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3627 if (ret < 0)
6f3c0e69 3628 goto err;
2ec5a8c1
NB		 3629 break;
3630 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3631 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3632 if (ret < 0)
3633 goto err;
3634 break;
3635 default:
3636 pr_err("Unknown Opcode: 0x%02x ITT:"
3637 " 0x%08x, i_state: %d on CID: %hu\n",
3638 cmd->iscsi_opcode, cmd->init_task_tag, state,
3639 conn->cid);
3640 goto err;
6f3c0e69
AG		 3641 }
3642
3643 return 0;
3644
3645err:
3646 return -1;
3647}
d2faaefb 3648EXPORT_SYMBOL(iscsit_immediate_queue);
6f3c0e69 3649
2ec5a8c1
NB		 3650static int
3651iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3652{
2ec5a8c1 3653 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3654 struct iscsi_queue_req *qr;
3655 struct iscsi_cmd *cmd;
3656 u8 state;
3657 int ret;
3658
2ec5a8c1
NB		 3659 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3660 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3661 cmd = qr->cmd;
3662 state = qr->state;
3663 kmem_cache_free(lio_qr_cache, qr);
3664
2ec5a8c1
NB		 3665 ret = t->iscsit_immediate_queue(conn, cmd, state);
3666 if (ret < 0)
3667 return ret;
3668 }
fd3a9025 3669
2ec5a8c1
NB		 3670 return 0;
3671}
6f3c0e69 3672
d2faaefb 3673int
2ec5a8c1
NB		 3674iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3675{
3676 int ret;
3677
3678check_rsp_state:
3679 switch (state) {
3680 case ISTATE_SEND_DATAIN:
3681 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3682 if (ret < 0)
3683 goto err;
2ec5a8c1
NB		 3684 else if (!ret)
3685 /* more drs */
3686 goto check_rsp_state;
3687 else if (ret == 1) {
3688 /* all done */
3689 spin_lock_bh(&cmd->istate_lock);
3690 cmd->i_state = ISTATE_SENT_STATUS;
3691 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3692
2ec5a8c1
NB		 3693 if (atomic_read(&conn->check_immediate_queue))
3694 return 1;
6f3c0e69 3695
2ec5a8c1
NB		 3696 return 0;
3697 } else if (ret == 2) {
3698 /* Still must send status,
3699 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3700 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3701 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3702 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3703 state = ISTATE_SEND_STATUS;
3704 goto check_rsp_state;
3705 }
3706
3707 break;
3708 case ISTATE_SEND_STATUS:
3709 case ISTATE_SEND_STATUS_RECOVERY:
3710 ret = iscsit_send_response(cmd, conn);
3711 break;
3712 case ISTATE_SEND_LOGOUTRSP:
3713 ret = iscsit_send_logout(cmd, conn);
3714 break;
3715 case ISTATE_SEND_ASYNCMSG:
3716 ret = iscsit_send_conn_drop_async_message(
3717 cmd, conn);
3718 break;
3719 case ISTATE_SEND_NOPIN:
3720 ret = iscsit_send_nopin(cmd, conn);
3721 break;
3722 case ISTATE_SEND_REJECT:
3723 ret = iscsit_send_reject(cmd, conn);
3724 break;
3725 case ISTATE_SEND_TASKMGTRSP:
3726 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3727 if (ret != 0)
6f3c0e69 3728 break;
2ec5a8c1
NB		 3729 ret = iscsit_tmr_post_handler(cmd, conn);
3730 if (ret != 0)
3731 iscsit_fall_back_to_erl0(conn->sess);
3732 break;
3733 case ISTATE_SEND_TEXTRSP:
3734 ret = iscsit_send_text_rsp(cmd, conn);
3735 break;
3736 default:
3737 pr_err("Unknown Opcode: 0x%02x ITT:"
3738 " 0x%08x, i_state: %d on CID: %hu\n",
3739 cmd->iscsi_opcode, cmd->init_task_tag,
3740 state, conn->cid);
3741 goto err;
3742 }
3743 if (ret < 0)
3744 goto err;
3745
2ec5a8c1
NB		 3746 switch (state) {
3747 case ISTATE_SEND_LOGOUTRSP:
3748 if (!iscsit_logout_post_handler(cmd, conn))
88dcd2da 3749 return -ECONNRESET;
2ec5a8c1
NB		 3750 /* fall through */
3751 case ISTATE_SEND_STATUS:
3752 case ISTATE_SEND_ASYNCMSG:
3753 case ISTATE_SEND_NOPIN:
3754 case ISTATE_SEND_STATUS_RECOVERY:
3755 case ISTATE_SEND_TEXTRSP:
3756 case ISTATE_SEND_TASKMGTRSP:
ba159914 3757 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3758 spin_lock_bh(&cmd->istate_lock);
3759 cmd->i_state = ISTATE_SENT_STATUS;
3760 spin_unlock_bh(&cmd->istate_lock);
3761 break;
2ec5a8c1
NB		 3762 default:
3763 pr_err("Unknown Opcode: 0x%02x ITT:"
3764 " 0x%08x, i_state: %d on CID: %hu\n",
3765 cmd->iscsi_opcode, cmd->init_task_tag,
3766 cmd->i_state, conn->cid);
3767 goto err;
6f3c0e69
AG		 3768 }
3769
2ec5a8c1
NB		 3770 if (atomic_read(&conn->check_immediate_queue))
3771 return 1;
3772
6f3c0e69
AG		 3773 return 0;
3774
3775err:
3776 return -1;
6f3c0e69 3777}
d2faaefb 3778EXPORT_SYMBOL(iscsit_response_queue);
6f3c0e69 3779
2ec5a8c1
NB		 3780static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3781{
3782 struct iscsit_transport *t = conn->conn_transport;
3783 struct iscsi_queue_req *qr;
3784 struct iscsi_cmd *cmd;
3785 u8 state;
3786 int ret;
3787
3788 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3789 cmd = qr->cmd;
3790 state = qr->state;
3791 kmem_cache_free(lio_qr_cache, qr);
3792
3793 ret = t->iscsit_response_queue(conn, cmd, state);
3794 if (ret == 1 || ret < 0)
3795 return ret;
3796 }
3797
3798 return 0;
3799}
3800
6f3c0e69
AG		 3801int iscsi_target_tx_thread(void *arg)
3802{
e48354ce 3803 int ret = 0;
88dcd2da 3804 struct iscsi_conn *conn = arg;
5e0cf5e6
JY		 3805 bool conn_freed = false;
3806
e48354ce
NB		 3807 /*
3808 * Allow ourselves to be interrupted by SIGINT so that a
3809 * connection recovery / failure event can be triggered externally.
3810 */
3811 allow_signal(SIGINT);
3812
e48354ce
NB		 3813 while (!kthread_should_stop()) {
3814 /*
3815 * Ensure that both TX and RX per connection kthreads
3816 * are scheduled to run on the same CPU.
3817 */
3818 iscsit_thread_check_cpumask(conn, current, 1);
3819
d5627acb 3820 wait_event_interruptible(conn->queues_wq,
88dcd2da 3821 !iscsit_conn_all_queues_empty(conn));
e48354ce 3822
88dcd2da 3823 if (signal_pending(current))
e48354ce
NB		 3824 goto transport_err;
3825
fd3a9025 3826get_immediate:
2ec5a8c1 3827 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3828 if (ret < 0)
3829 goto transport_err;
e48354ce 3830
2ec5a8c1 3831 ret = iscsit_handle_response_queue(conn);
5e0cf5e6 3832 if (ret == 1) {
fd3a9025 3833 goto get_immediate;
5e0cf5e6
JY		 3834 } else if (ret == -ECONNRESET) {
3835 conn_freed = true;
88dcd2da 3836 goto out;
5e0cf5e6 3837 } else if (ret < 0) {
6f3c0e69 3838 goto transport_err;
5e0cf5e6 3839 }
e48354ce
NB		 3840 }
3841
3842transport_err:
e5419865
NB		 3843 /*
3844 * Avoid the normal connection failure code-path if this connection
3845 * is still within LOGIN mode, and iscsi_np process context is
3846 * responsible for cleaning up the early connection failure.
3847 */
3848 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
5e0cf5e6 3849 iscsit_take_action_for_connection_exit(conn, &conn_freed);
e48354ce 3850out:
5e0cf5e6
JY		 3851 if (!conn_freed) {
3852 while (!kthread_should_stop()) {
3853 msleep(100);
3854 }
3855 }
e48354ce
NB		 3856 return 0;
3857}
3858
3e1c81a9
NB		 3859static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3860{
3861 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3862 struct iscsi_cmd *cmd;
3863 int ret = 0;
3864
3865 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3866 case ISCSI_OP_SCSI_CMD:
676687c6 3867 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3868 if (!cmd)
ba159914 3869 goto reject;
3e1c81a9
NB		 3870
3871 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3872 break;
3873 case ISCSI_OP_SCSI_DATA_OUT:
3874 ret = iscsit_handle_data_out(conn, buf);
3875 break;
3876 case ISCSI_OP_NOOP_OUT:
3877 cmd = NULL;
3878 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
676687c6 3879 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3880 if (!cmd)
ba159914 3881 goto reject;
3e1c81a9
NB		 3882 }
3883 ret = iscsit_handle_nop_out(conn, cmd, buf);
3884 break;
3885 case ISCSI_OP_SCSI_TMFUNC:
676687c6 3886 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3887 if (!cmd)
ba159914 3888 goto reject;
3e1c81a9
NB		 3889
3890 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3891 break;
3892 case ISCSI_OP_TEXT:
e4f4e801
SG		 3893 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3894 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3895 if (!cmd)
3896 goto reject;
3897 } else {
3898 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3899 if (!cmd)
3900 goto reject;
3901 }
64534aa7
NB		 3902
3903 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 3904 break;
3905 case ISCSI_OP_LOGOUT:
676687c6 3906 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3907 if (!cmd)
ba159914 3908 goto reject;
3e1c81a9
NB		 3909
3910 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3911 if (ret > 0)
3912 wait_for_completion_timeout(&conn->conn_logout_comp,
3913 SECONDS_FOR_LOGOUT_COMP * HZ);
3914 break;
3915 case ISCSI_OP_SNACK:
3916 ret = iscsit_handle_snack(conn, buf);
3917 break;
3918 default:
3919 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3920 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3921 pr_err("Cannot recover from unknown"
3922 " opcode while ERL=0, closing iSCSI connection.\n");
3923 return -1;
3924 }
c04a6091
CVB		 3925 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3926 " closing iSCSI connection.\n");
3927 ret = -1;
3e1c81a9
NB		 3928 break;
3929 }
3930
3931 return ret;
ba159914
NB		 3932reject:
3933 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 3934}
3935
ca82c2bd
NB		 3936static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3937{
3938 bool ret;
3939
3940 spin_lock_bh(&conn->state_lock);
3941 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3942 spin_unlock_bh(&conn->state_lock);
3943
3944 return ret;
3945}
3946
e8205cca 3947static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
e48354ce 3948{
e8205cca 3949 int ret;
e48354ce
NB		 3950 u8 buffer[ISCSI_HDR_LEN], opcode;
3951 u32 checksum = 0, digest = 0;
e48354ce 3952 struct kvec iov;
3e1c81a9 3953
e48354ce
NB		 3954 while (!kthread_should_stop()) {
3955 /*
3956 * Ensure that both TX and RX per connection kthreads
3957 * are scheduled to run on the same CPU.
3958 */
3959 iscsit_thread_check_cpumask(conn, current, 0);
3960
3961 memset(buffer, 0, ISCSI_HDR_LEN);
3962 memset(&iov, 0, sizeof(struct kvec));
3963
3964 iov.iov_base = buffer;
3965 iov.iov_len = ISCSI_HDR_LEN;
3966
3967 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3968 if (ret != ISCSI_HDR_LEN) {
3969 iscsit_rx_thread_wait_for_tcp(conn);
e8205cca 3970 return;
e48354ce
NB		 3971 }
3972
e48354ce
NB		 3973 if (conn->conn_ops->HeaderDigest) {
3974 iov.iov_base = &digest;
3975 iov.iov_len = ISCSI_CRC_LEN;
3976
3977 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3978 if (ret != ISCSI_CRC_LEN) {
3979 iscsit_rx_thread_wait_for_tcp(conn);
e8205cca 3980 return;
e48354ce
NB		 3981 }
3982
69110e3c 3983 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
e48354ce
NB		 3984 buffer, ISCSI_HDR_LEN,
3985 0, NULL, (u8 *)&checksum);
3986
3987 if (digest != checksum) {
3988 pr_err("HeaderDigest CRC32C failed,"
3989 " received 0x%08x, computed 0x%08x\n",
3990 digest, checksum);
3991 /*
3992 * Set the PDU to 0xff so it will intentionally
3993 * hit default in the switch below.
3994 */
3995 memset(buffer, 0xff, ISCSI_HDR_LEN);
04f3b31b 3996 atomic_long_inc(&conn->sess->conn_digest_errors);
e48354ce
NB		 3997 } else {
3998 pr_debug("Got HeaderDigest CRC32C"
3999 " 0x%08x\n", checksum);
4000 }
4001 }
4002
4003 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
e8205cca 4004 return;
e48354ce
NB		 4005
4006 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4007
4008 if (conn->sess->sess_ops->SessionType &&
4009 ((!(opcode & ISCSI_OP_TEXT)) ||
4010 (!(opcode & ISCSI_OP_LOGOUT)))) {
4011 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4012 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4013 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4014 buffer);
e8205cca 4015 return;
e48354ce
NB		 4016 }
4017
3e1c81a9
NB		 4018 ret = iscsi_target_rx_opcode(conn, buffer);
4019 if (ret < 0)
e8205cca 4020 return;
e48354ce 4021 }
e8205cca
VP		 4022}
4023
4024int iscsi_target_rx_thread(void *arg)
4025{
4026 int rc;
4027 struct iscsi_conn *conn = arg;
5e0cf5e6 4028 bool conn_freed = false;
e8205cca
VP		 4029
4030 /*
4031 * Allow ourselves to be interrupted by SIGINT so that a
4032 * connection recovery / failure event can be triggered externally.
4033 */
4034 allow_signal(SIGINT);
4035 /*
4036 * Wait for iscsi_post_login_handler() to complete before allowing
4037 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4038 */
4039 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4040 if (rc < 0 || iscsi_target_check_conn_state(conn))
5e0cf5e6 4041 goto out;
e8205cca
VP		 4042
4043 if (!conn->conn_transport->iscsit_get_rx_pdu)
4044 return 0;
4045
4046 conn->conn_transport->iscsit_get_rx_pdu(conn);
e48354ce 4047
e48354ce
NB		 4048 if (!signal_pending(current))
4049 atomic_set(&conn->transport_failed, 1);
5e0cf5e6
JY		 4050 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4051
4052out:
4053 if (!conn_freed) {
4054 while (!kthread_should_stop()) {
4055 msleep(100);
4056 }
4057 }
4058
e48354ce
NB		 4059 return 0;
4060}
4061
4062static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4063{
064cdd2d 4064 LIST_HEAD(tmp_list);
e48354ce
NB		 4065 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4066 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4067 /*
4068 * We expect this function to only ever be called from either RX or TX
4069 * thread context via iscsit_close_connection() once the other context
4070 * has been reset -> returned sleeping pre-handler state.
4071 */
4072 spin_lock_bh(&conn->cmd_lock);
064cdd2d 4073 list_splice_init(&conn->conn_cmd_list, &tmp_list);
e48354ce 4074
064cdd2d
NB		 4075 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4076 struct se_cmd *se_cmd = &cmd->se_cmd;
4077
4078 if (se_cmd->se_tfo != NULL) {
4079 spin_lock(&se_cmd->t_state_lock);
4080 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4081 spin_unlock(&se_cmd->t_state_lock);
4082 }
4083 }
4084 spin_unlock_bh(&conn->cmd_lock);
4085
4086 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
5159d763 4087 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4088
4089 iscsit_increment_maxcmdsn(cmd, sess);
aafc9d15 4090 iscsit_free_cmd(cmd, true);
e48354ce 4091
e48354ce 4092 }
e48354ce
NB		 4093}
4094
4095static void iscsit_stop_timers_for_cmds(
4096 struct iscsi_conn *conn)
4097{
4098 struct iscsi_cmd *cmd;
4099
4100 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4101 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4102 if (cmd->data_direction == DMA_TO_DEVICE)
4103 iscsit_stop_dataout_timer(cmd);
4104 }
4105 spin_unlock_bh(&conn->cmd_lock);
4106}
4107
4108int iscsit_close_connection(
4109 struct iscsi_conn *conn)
4110{
4111 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4112 struct iscsi_session *sess = conn->sess;
4113
4114 pr_debug("Closing iSCSI connection CID %hu on SID:"
4115 " %u\n", conn->cid, sess->sid);
4116 /*
b4869ee9
VP		 4117 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4118 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4119 * sleeping and the logout response never got sent because the
4120 * connection failed.
f068fbc8
NB		 4121 *
4122 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4123 * to signal logout response TX interrupt completion. Go ahead and skip
4124 * this for iser since isert_rx_opcode() does not wait on logout failure,
4125 * and to avoid iscsi_conn pointer dereference in iser-target code.
e48354ce 4126 */
bd027d85 4127 if (!conn->conn_transport->rdma_shutdown)
f068fbc8 4128 complete(&conn->conn_logout_comp);
e48354ce 4129
88dcd2da
NB		 4130 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4131 if (conn->tx_thread &&
4132 cmpxchg(&conn->tx_thread_active, true, false)) {
4133 send_sig(SIGINT, conn->tx_thread, 1);
4134 kthread_stop(conn->tx_thread);
4135 }
4136 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4137 if (conn->rx_thread &&
4138 cmpxchg(&conn->rx_thread_active, true, false)) {
4139 send_sig(SIGINT, conn->rx_thread, 1);
4140 kthread_stop(conn->rx_thread);
4141 }
4142 }
4143
4144 spin_lock(&iscsit_global->ts_bitmap_lock);
4145 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4146 get_order(1));
4147 spin_unlock(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 4148
4149 iscsit_stop_timers_for_cmds(conn);
4150 iscsit_stop_nopin_response_timer(conn);
4151 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4152
4153 if (conn->conn_transport->iscsit_wait_conn)
4154 conn->conn_transport->iscsit_wait_conn(conn);
4155
e48354ce
NB		 4156 /*
4157 * During Connection recovery drop unacknowledged out of order
4158 * commands for this connection, and prepare the other commands
53c561dc 4159 * for reallegiance.
e48354ce
NB		 4160 *
4161 * During normal operation clear the out of order commands (but
4162 * do not free the struct iscsi_ooo_cmdsn's) and release all
4163 * struct iscsi_cmds.
4164 */
4165 if (atomic_read(&conn->connection_recovery)) {
4166 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
53c561dc 4167 iscsit_prepare_cmds_for_reallegiance(conn);
e48354ce
NB		 4168 } else {
4169 iscsit_clear_ooo_cmdsns_for_conn(conn);
4170 iscsit_release_commands_from_conn(conn);
4171 }
bbc05048 4172 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4173
4174 /*
4175 * Handle decrementing session or connection usage count if
4176 * a logout response was not able to be sent because the
4177 * connection failed. Fall back to Session Recovery here.
4178 */
4179 if (atomic_read(&conn->conn_logout_remove)) {
4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4181 iscsit_dec_conn_usage_count(conn);
4182 iscsit_dec_session_usage_count(sess);
4183 }
4184 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4185 iscsit_dec_conn_usage_count(conn);
4186
4187 atomic_set(&conn->conn_logout_remove, 0);
4188 atomic_set(&sess->session_reinstatement, 0);
4189 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190 }
4191
4192 spin_lock_bh(&sess->conn_lock);
4193 list_del(&conn->conn_list);
4194
4195 /*
4196 * Attempt to let the Initiator know this connection failed by
4197 * sending an Connection Dropped Async Message on another
4198 * active connection.
4199 */
4200 if (atomic_read(&conn->connection_recovery))
4201 iscsit_build_conn_drop_async_message(conn);
4202
4203 spin_unlock_bh(&sess->conn_lock);
4204
4205 /*
4206 * If connection reinstatement is being performed on this connection,
4207 * up the connection reinstatement semaphore that is being blocked on
4208 * in iscsit_cause_connection_reinstatement().
4209 */
4210 spin_lock_bh(&conn->state_lock);
4211 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4212 spin_unlock_bh(&conn->state_lock);
4213 complete(&conn->conn_wait_comp);
4214 wait_for_completion(&conn->conn_post_wait_comp);
4215 spin_lock_bh(&conn->state_lock);
4216 }
4217
4218 /*
4219 * If connection reinstatement is being performed on this connection
4220 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4221 * connection wait rcfr semaphore that is being blocked on
4222 * an iscsit_connection_reinstatement_rcfr().
4223 */
4224 if (atomic_read(&conn->connection_wait_rcfr)) {
4225 spin_unlock_bh(&conn->state_lock);
4226 complete(&conn->conn_wait_rcfr_comp);
4227 wait_for_completion(&conn->conn_post_wait_comp);
4228 spin_lock_bh(&conn->state_lock);
4229 }
4230 atomic_set(&conn->connection_reinstatement, 1);
4231 spin_unlock_bh(&conn->state_lock);
4232
4233 /*
4234 * If any other processes are accessing this connection pointer we
4235 * must wait until they have completed.
4236 */
4237 iscsit_check_conn_usage_count(conn);
4238
69110e3c
HX		 4239 ahash_request_free(conn->conn_tx_hash);
4240 if (conn->conn_rx_hash) {
4241 struct crypto_ahash *tfm;
4242
4243 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4244 ahash_request_free(conn->conn_rx_hash);
4245 crypto_free_ahash(tfm);
4246 }
e48354ce 4247
fbecb659 4248 free_cpumask_var(conn->conn_cpumask);
e48354ce
NB		 4249
4250 kfree(conn->conn_ops);
4251 conn->conn_ops = NULL;
4252
bf6932f4 4253 if (conn->sock)
e48354ce 4254 sock_release(conn->sock);
baa4d64b
NB		 4255
4256 if (conn->conn_transport->iscsit_free_conn)
4257 conn->conn_transport->iscsit_free_conn(conn);
4258
4259 iscsit_put_transport(conn->conn_transport);
4260
e48354ce
NB		 4261 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4262 conn->conn_state = TARG_CONN_STATE_FREE;
4263 kfree(conn);
4264
4265 spin_lock_bh(&sess->conn_lock);
4266 atomic_dec(&sess->nconn);
4267 pr_debug("Decremented iSCSI connection count to %hu from node:"
4268 " %s\n", atomic_read(&sess->nconn),
4269 sess->sess_ops->InitiatorName);
4270 /*
4271 * Make sure that if one connection fails in an non ERL=2 iSCSI
4272 * Session that they all fail.
4273 */
4274 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4275 !atomic_read(&sess->session_logout))
4276 atomic_set(&sess->session_fall_back_to_erl0, 1);
4277
4278 /*
4279 * If this was not the last connection in the session, and we are
4280 * performing session reinstatement or falling back to ERL=0, call
4281 * iscsit_stop_session() without sleeping to shutdown the other
4282 * active connections.
4283 */
4284 if (atomic_read(&sess->nconn)) {
4285 if (!atomic_read(&sess->session_reinstatement) &&
4286 !atomic_read(&sess->session_fall_back_to_erl0)) {
4287 spin_unlock_bh(&sess->conn_lock);
4288 return 0;
4289 }
4290 if (!atomic_read(&sess->session_stop_active)) {
4291 atomic_set(&sess->session_stop_active, 1);
4292 spin_unlock_bh(&sess->conn_lock);
4293 iscsit_stop_session(sess, 0, 0);
4294 return 0;
4295 }
4296 spin_unlock_bh(&sess->conn_lock);
4297 return 0;
4298 }
4299
4300 /*
4301 * If this was the last connection in the session and one of the
4302 * following is occurring:
4303 *
4304 * Session Reinstatement is not being performed, and are falling back
4305 * to ERL=0 call iscsit_close_session().
4306 *
4307 * Session Logout was requested. iscsit_close_session() will be called
4308 * elsewhere.
4309 *
4310 * Session Continuation is not being performed, start the Time2Retain
4311 * handler and check if sleep_on_sess_wait_sem is active.
4312 */
4313 if (!atomic_read(&sess->session_reinstatement) &&
4314 atomic_read(&sess->session_fall_back_to_erl0)) {
4315 spin_unlock_bh(&sess->conn_lock);
44f33d0f 4316 iscsit_close_session(sess);
e48354ce
NB		 4317
4318 return 0;
4319 } else if (atomic_read(&sess->session_logout)) {
4320 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4321 sess->session_state = TARG_SESS_STATE_FREE;
4322 spin_unlock_bh(&sess->conn_lock);
4323
4324 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4325 complete(&sess->session_wait_comp);
4326
4327 return 0;
4328 } else {
4329 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4330 sess->session_state = TARG_SESS_STATE_FAILED;
4331
4332 if (!atomic_read(&sess->session_continuation)) {
4333 spin_unlock_bh(&sess->conn_lock);
4334 iscsit_start_time2retain_handler(sess);
4335 } else
4336 spin_unlock_bh(&sess->conn_lock);
4337
4338 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4339 complete(&sess->session_wait_comp);
4340
4341 return 0;
4342 }
e48354ce
NB		 4343}
4344
44f33d0f
CH		 4345/*
4346 * If the iSCSI Session for the iSCSI Initiator Node exists,
4347 * forcefully shutdown the iSCSI NEXUS.
4348 */
e48354ce
NB		 4349int iscsit_close_session(struct iscsi_session *sess)
4350{
60bfcf8e 4351 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4352 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4353
4354 if (atomic_read(&sess->nconn)) {
4355 pr_err("%d connection(s) still exist for iSCSI session"
4356 " to %s\n", atomic_read(&sess->nconn),
4357 sess->sess_ops->InitiatorName);
4358 BUG();
4359 }
4360
4361 spin_lock_bh(&se_tpg->session_lock);
4362 atomic_set(&sess->session_logout, 1);
4363 atomic_set(&sess->session_reinstatement, 1);
4364 iscsit_stop_time2retain_timer(sess);
4365 spin_unlock_bh(&se_tpg->session_lock);
4366
4367 /*
4368 * transport_deregister_session_configfs() will clear the
4369 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4370 * can be setting it again with __transport_register_session() in
4371 * iscsi_post_login_handler() again after the iscsit_stop_session()
4372 * completes in iscsi_np context.
4373 */
4374 transport_deregister_session_configfs(sess->se_sess);
4375
4376 /*
4377 * If any other processes are accessing this session pointer we must
4378 * wait until they have completed. If we are in an interrupt (the
4379 * time2retain handler) and contain and active session usage count we
4380 * restart the timer and exit.
4381 */
4382 if (!in_interrupt()) {
4383 if (iscsit_check_session_usage_count(sess) == 1)
4384 iscsit_stop_session(sess, 1, 1);
4385 } else {
4386 if (iscsit_check_session_usage_count(sess) == 2) {
4387 atomic_set(&sess->session_logout, 0);
4388 iscsit_start_time2retain_handler(sess);
4389 return 0;
4390 }
4391 }
4392
4393 transport_deregister_session(sess->se_sess);
4394
4395 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4396 iscsit_free_connection_recovery_entires(sess);
4397
4398 iscsit_free_all_ooo_cmdsns(sess);
4399
4400 spin_lock_bh(&se_tpg->session_lock);
4401 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402 sess->session_state = TARG_SESS_STATE_FREE;
4403 pr_debug("Released iSCSI session from node: %s\n",
4404 sess->sess_ops->InitiatorName);
4405 tpg->nsessions--;
4406 if (tpg->tpg_tiqn)
4407 tpg->tpg_tiqn->tiqn_nsessions--;
4408
4409 pr_debug("Decremented number of active iSCSI Sessions on"
4410 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4411
4412 spin_lock(&sess_idr_lock);
4413 idr_remove(&sess_idr, sess->session_index);
4414 spin_unlock(&sess_idr_lock);
4415
4416 kfree(sess->sess_ops);
4417 sess->sess_ops = NULL;
4418 spin_unlock_bh(&se_tpg->session_lock);
4419
4420 kfree(sess);
4421 return 0;
4422}
4423
4424static void iscsit_logout_post_handler_closesession(
4425 struct iscsi_conn *conn)
4426{
4427 struct iscsi_session *sess = conn->sess;
007d038b
NB		 4428 int sleep = 1;
4429 /*
4430 * Traditional iscsi/tcp will invoke this logic from TX thread
4431 * context during session logout, so clear tx_thread_active and
4432 * sleep if iscsit_close_connection() has not already occured.
4433 *
4434 * Since iser-target invokes this logic from it's own workqueue,
4435 * always sleep waiting for RX/TX thread shutdown to complete
4436 * within iscsit_close_connection().
4437 */
105fa2f4 4438 if (!conn->conn_transport->rdma_shutdown) {
007d038b 4439 sleep = cmpxchg(&conn->tx_thread_active, true, false);
105fa2f4
NB		 4440 if (!sleep)
4441 return;
4442 }
e48354ce
NB		 4443
4444 atomic_set(&conn->conn_logout_remove, 0);
4445 complete(&conn->conn_logout_comp);
4446
4447 iscsit_dec_conn_usage_count(conn);
88dcd2da 4448 iscsit_stop_session(sess, sleep, sleep);
e48354ce 4449 iscsit_dec_session_usage_count(sess);
44f33d0f 4450 iscsit_close_session(sess);
e48354ce
NB		 4451}
4452
4453static void iscsit_logout_post_handler_samecid(
4454 struct iscsi_conn *conn)
4455{
007d038b
NB		 4456 int sleep = 1;
4457
105fa2f4 4458 if (!conn->conn_transport->rdma_shutdown) {
007d038b 4459 sleep = cmpxchg(&conn->tx_thread_active, true, false);
105fa2f4
NB		 4460 if (!sleep)
4461 return;
4462 }
e48354ce
NB		 4463
4464 atomic_set(&conn->conn_logout_remove, 0);
4465 complete(&conn->conn_logout_comp);
4466
88dcd2da 4467 iscsit_cause_connection_reinstatement(conn, sleep);
e48354ce
NB		 4468 iscsit_dec_conn_usage_count(conn);
4469}
4470
4471static void iscsit_logout_post_handler_diffcid(
4472 struct iscsi_conn *conn,
4473 u16 cid)
4474{
4475 struct iscsi_conn *l_conn;
4476 struct iscsi_session *sess = conn->sess;
b53b0d99 4477 bool conn_found = false;
e48354ce
NB		 4478
4479 if (!sess)
4480 return;
4481
4482 spin_lock_bh(&sess->conn_lock);
4483 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4484 if (l_conn->cid == cid) {
4485 iscsit_inc_conn_usage_count(l_conn);
b53b0d99 4486 conn_found = true;
e48354ce
NB		 4487 break;
4488 }
4489 }
4490 spin_unlock_bh(&sess->conn_lock);
4491
b53b0d99 4492 if (!conn_found)
e48354ce
NB		 4493 return;
4494
4495 if (l_conn->sock)
4496 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4497
4498 spin_lock_bh(&l_conn->state_lock);
4499 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4500 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4501 spin_unlock_bh(&l_conn->state_lock);
4502
4503 iscsit_cause_connection_reinstatement(l_conn, 1);
4504 iscsit_dec_conn_usage_count(l_conn);
4505}
4506
4507/*
4508 * Return of 0 causes the TX thread to restart.
4509 */
2ec5a8c1 4510int iscsit_logout_post_handler(
e48354ce
NB		 4511 struct iscsi_cmd *cmd,
4512 struct iscsi_conn *conn)
4513{
4514 int ret = 0;
4515
4516 switch (cmd->logout_reason) {
4517 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4518 switch (cmd->logout_response) {
4519 case ISCSI_LOGOUT_SUCCESS:
4520 case ISCSI_LOGOUT_CLEANUP_FAILED:
4521 default:
4522 iscsit_logout_post_handler_closesession(conn);
4523 break;
4524 }
4525 ret = 0;
4526 break;
4527 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4528 if (conn->cid == cmd->logout_cid) {
4529 switch (cmd->logout_response) {
4530 case ISCSI_LOGOUT_SUCCESS:
4531 case ISCSI_LOGOUT_CLEANUP_FAILED:
4532 default:
4533 iscsit_logout_post_handler_samecid(conn);
4534 break;
4535 }
4536 ret = 0;
4537 } else {
4538 switch (cmd->logout_response) {
4539 case ISCSI_LOGOUT_SUCCESS:
4540 iscsit_logout_post_handler_diffcid(conn,
4541 cmd->logout_cid);
4542 break;
4543 case ISCSI_LOGOUT_CID_NOT_FOUND:
4544 case ISCSI_LOGOUT_CLEANUP_FAILED:
4545 default:
4546 break;
4547 }
4548 ret = 1;
4549 }
4550 break;
4551 case ISCSI_LOGOUT_REASON_RECOVERY:
4552 switch (cmd->logout_response) {
4553 case ISCSI_LOGOUT_SUCCESS:
4554 case ISCSI_LOGOUT_CID_NOT_FOUND:
4555 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4556 case ISCSI_LOGOUT_CLEANUP_FAILED:
4557 default:
4558 break;
4559 }
4560 ret = 1;
4561 break;
4562 default:
4563 break;
4564
4565 }
4566 return ret;
4567}
2ec5a8c1 4568EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4569
4570void iscsit_fail_session(struct iscsi_session *sess)
4571{
4572 struct iscsi_conn *conn;
4573
4574 spin_lock_bh(&sess->conn_lock);
4575 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4576 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4577 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4578 }
4579 spin_unlock_bh(&sess->conn_lock);
4580
4581 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4582 sess->session_state = TARG_SESS_STATE_FAILED;
4583}
4584
4585int iscsit_free_session(struct iscsi_session *sess)
4586{
4587 u16 conn_count = atomic_read(&sess->nconn);
4588 struct iscsi_conn *conn, *conn_tmp = NULL;
4589 int is_last;
4590
4591 spin_lock_bh(&sess->conn_lock);
4592 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4593
4594 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4595 conn_list) {
4596 if (conn_count == 0)
4597 break;
4598
4599 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4600 is_last = 1;
4601 } else {
4602 iscsit_inc_conn_usage_count(conn_tmp);
4603 is_last = 0;
4604 }
4605 iscsit_inc_conn_usage_count(conn);
4606
4607 spin_unlock_bh(&sess->conn_lock);
4608 iscsit_cause_connection_reinstatement(conn, 1);
4609 spin_lock_bh(&sess->conn_lock);
4610
4611 iscsit_dec_conn_usage_count(conn);
4612 if (is_last == 0)
4613 iscsit_dec_conn_usage_count(conn_tmp);
4614
4615 conn_count--;
4616 }
4617
4618 if (atomic_read(&sess->nconn)) {
4619 spin_unlock_bh(&sess->conn_lock);
4620 wait_for_completion(&sess->session_wait_comp);
4621 } else
4622 spin_unlock_bh(&sess->conn_lock);
4623
44f33d0f 4624 iscsit_close_session(sess);
e48354ce
NB		 4625 return 0;
4626}
4627
4628void iscsit_stop_session(
4629 struct iscsi_session *sess,
4630 int session_sleep,
4631 int connection_sleep)
4632{
4633 u16 conn_count = atomic_read(&sess->nconn);
4634 struct iscsi_conn *conn, *conn_tmp = NULL;
4635 int is_last;
4636
4637 spin_lock_bh(&sess->conn_lock);
4638 if (session_sleep)
4639 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4640
4641 if (connection_sleep) {
4642 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4643 conn_list) {
4644 if (conn_count == 0)
4645 break;
4646
4647 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4648 is_last = 1;
4649 } else {
4650 iscsit_inc_conn_usage_count(conn_tmp);
4651 is_last = 0;
4652 }
4653 iscsit_inc_conn_usage_count(conn);
4654
4655 spin_unlock_bh(&sess->conn_lock);
4656 iscsit_cause_connection_reinstatement(conn, 1);
4657 spin_lock_bh(&sess->conn_lock);
4658
4659 iscsit_dec_conn_usage_count(conn);
4660 if (is_last == 0)
4661 iscsit_dec_conn_usage_count(conn_tmp);
4662 conn_count--;
4663 }
4664 } else {
4665 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4666 iscsit_cause_connection_reinstatement(conn, 0);
4667 }
4668
4669 if (session_sleep && atomic_read(&sess->nconn)) {
4670 spin_unlock_bh(&sess->conn_lock);
4671 wait_for_completion(&sess->session_wait_comp);
4672 } else
4673 spin_unlock_bh(&sess->conn_lock);
4674}
4675
4676int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4677{
4678 struct iscsi_session *sess;
4679 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4680 struct se_session *se_sess, *se_sess_tmp;
417c20a9 4681 LIST_HEAD(free_list);
e48354ce
NB		 4682 int session_count = 0;
4683
4684 spin_lock_bh(&se_tpg->session_lock);
4685 if (tpg->nsessions && !force) {
4686 spin_unlock_bh(&se_tpg->session_lock);
4687 return -1;
4688 }
4689
4690 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4691 sess_list) {
4692 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4693
4694 spin_lock(&sess->conn_lock);
4695 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4696 atomic_read(&sess->session_logout) ||
4697 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4698 spin_unlock(&sess->conn_lock);
4699 continue;
4700 }
4701 atomic_set(&sess->session_reinstatement, 1);
197b806a 4702 atomic_set(&sess->session_fall_back_to_erl0, 1);
e48354ce 4703 spin_unlock(&sess->conn_lock);
e48354ce 4704
417c20a9
NB		 4705 list_move_tail(&se_sess->sess_list, &free_list);
4706 }
4707 spin_unlock_bh(&se_tpg->session_lock);
e48354ce 4708
417c20a9
NB		 4709 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4710 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4711
4712 iscsit_free_session(sess);
e48354ce
NB		 4713 session_count++;
4714 }
e48354ce
NB		 4715
4716 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4717 " Group: %hu\n", session_count, tpg->tpgt);
4718 return 0;
4719}
4720
4721MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4722MODULE_VERSION("4.1.x");
4723MODULE_AUTHOR("nab@Linux-iSCSI.org");
4724MODULE_LICENSE("GPL");
4725
4726module_init(iscsi_target_init_module);
4727module_exit(iscsi_target_cleanup_module);