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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into...
[mirror_ubuntu-artful-kernel.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
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
131 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
132 if (!tiqn) {
133 pr_err("Unable to allocate struct iscsi_tiqn\n");
134 return ERR_PTR(-ENOMEM);
135 }
136
137 sprintf(tiqn->tiqn, "%s", buf);
138 INIT_LIST_HEAD(&tiqn->tiqn_list);
139 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
140 spin_lock_init(&tiqn->tiqn_state_lock);
141 spin_lock_init(&tiqn->tiqn_tpg_lock);
142 spin_lock_init(&tiqn->sess_err_stats.lock);
143 spin_lock_init(&tiqn->login_stats.lock);
144 spin_lock_init(&tiqn->logout_stats.lock);
145
e48354ce
NB		 146 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
147
c9365bd0 148 idr_preload(GFP_KERNEL);
e48354ce 149 spin_lock(&tiqn_lock);
c9365bd0
TH		 150
151 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 152 if (ret < 0) {
c9365bd0 153 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 154 spin_unlock(&tiqn_lock);
c9365bd0 155 idr_preload_end();
e48354ce
NB		 156 kfree(tiqn);
157 return ERR_PTR(ret);
158 }
c9365bd0 159 tiqn->tiqn_index = ret;
e48354ce 160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 161
e48354ce 162 spin_unlock(&tiqn_lock);
c9365bd0 163 idr_preload_end();
e48354ce
NB		 164
165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
166
167 return tiqn;
168
169}
170
171static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
172{
173 /*
174 * Wait for accesses to said struct iscsi_tiqn to end.
175 */
176 spin_lock(&tiqn->tiqn_state_lock);
177 while (tiqn->tiqn_access_count != 0) {
178 spin_unlock(&tiqn->tiqn_state_lock);
179 msleep(10);
180 spin_lock(&tiqn->tiqn_state_lock);
181 }
182 spin_unlock(&tiqn->tiqn_state_lock);
183}
184
185void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
186{
187 /*
188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
189 * while holding tiqn->tiqn_state_lock. This means that all subsequent
190 * attempts to access this struct iscsi_tiqn will fail from both transport
191 * fabric and control code paths.
192 */
193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
194 pr_err("iscsit_set_tiqn_shutdown() failed\n");
195 return;
196 }
197
198 iscsit_wait_for_tiqn(tiqn);
199
200 spin_lock(&tiqn_lock);
201 list_del(&tiqn->tiqn_list);
202 idr_remove(&tiqn_idr, tiqn->tiqn_index);
203 spin_unlock(&tiqn_lock);
204
205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
206 tiqn->tiqn);
207 kfree(tiqn);
208}
209
210int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
211{
212 int ret;
213 /*
214 * Determine if the network portal is accepting storage traffic.
215 */
216 spin_lock_bh(&np->np_thread_lock);
217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
218 spin_unlock_bh(&np->np_thread_lock);
219 return -1;
220 }
e48354ce
NB		 221 spin_unlock_bh(&np->np_thread_lock);
222 /*
223 * Determine if the portal group is accepting storage traffic.
224 */
225 spin_lock_bh(&tpg->tpg_state_lock);
226 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
227 spin_unlock_bh(&tpg->tpg_state_lock);
228 return -1;
229 }
230 spin_unlock_bh(&tpg->tpg_state_lock);
231
232 /*
233 * Here we serialize access across the TIQN+TPG Tuple.
234 */
a91eb7d9 235 ret = down_interruptible(&tpg->np_login_sem);
ee7619f2 236 if (ret != 0)
e48354ce
NB		 237 return -1;
238
a91eb7d9
NB		 239 spin_lock_bh(&tpg->tpg_state_lock);
240 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
241 spin_unlock_bh(&tpg->tpg_state_lock);
242 up(&tpg->np_login_sem);
243 return -1;
244 }
245 spin_unlock_bh(&tpg->tpg_state_lock);
e48354ce
NB		 246
247 return 0;
248}
249
a91eb7d9
NB		 250void iscsit_login_kref_put(struct kref *kref)
251{
252 struct iscsi_tpg_np *tpg_np = container_of(kref,
253 struct iscsi_tpg_np, tpg_np_kref);
254
255 complete(&tpg_np->tpg_np_comp);
256}
257
258int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
259 struct iscsi_tpg_np *tpg_np)
e48354ce
NB		 260{
261 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
262
a91eb7d9 263 up(&tpg->np_login_sem);
e48354ce 264
a91eb7d9
NB		 265 if (tpg_np)
266 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
e48354ce
NB		 267
268 if (tiqn)
269 iscsit_put_tiqn_for_login(tiqn);
270
271 return 0;
272}
273
05b96892 274bool iscsit_check_np_match(
13a3cf08 275 struct sockaddr_storage *sockaddr,
05b96892 276 struct iscsi_np *np,
e48354ce
NB		 277 int network_transport)
278{
279 struct sockaddr_in *sock_in, *sock_in_e;
280 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 281 bool ip_match = false;
69d75574 282 u16 port, port_e;
e48354ce 283
05b96892
NB		 284 if (sockaddr->ss_family == AF_INET6) {
285 sock_in6 = (struct sockaddr_in6 *)sockaddr;
286 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
287
288 if (!memcmp(&sock_in6->sin6_addr.in6_u,
289 &sock_in6_e->sin6_addr.in6_u,
290 sizeof(struct in6_addr)))
291 ip_match = true;
292
293 port = ntohs(sock_in6->sin6_port);
69d75574 294 port_e = ntohs(sock_in6_e->sin6_port);
05b96892
NB		 295 } else {
296 sock_in = (struct sockaddr_in *)sockaddr;
297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
298
299 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
300 ip_match = true;
301
302 port = ntohs(sock_in->sin_port);
69d75574 303 port_e = ntohs(sock_in_e->sin_port);
05b96892
NB		 304 }
305
69d75574 306 if (ip_match && (port_e == port) &&
05b96892
NB		 307 (np->np_network_transport == network_transport))
308 return true;
309
310 return false;
311}
312
ee291e63
AG		 313/*
314 * Called with mutex np_lock held
315 */
05b96892 316static struct iscsi_np *iscsit_get_np(
13a3cf08 317 struct sockaddr_storage *sockaddr,
05b96892
NB		 318 int network_transport)
319{
320 struct iscsi_np *np;
321 bool match;
322
e48354ce 323 list_for_each_entry(np, &g_np_list, np_list) {
ee291e63 324 spin_lock_bh(&np->np_thread_lock);
e48354ce 325 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
ee291e63 326 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 327 continue;
328 }
329
05b96892 330 match = iscsit_check_np_match(sockaddr, np, network_transport);
0bcc297e 331 if (match) {
e48354ce
NB		 332 /*
333 * Increment the np_exports reference count now to
334 * prevent iscsit_del_np() below from being called
335 * while iscsi_tpg_add_network_portal() is called.
336 */
337 np->np_exports++;
ee291e63 338 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 339 return np;
340 }
ee291e63 341 spin_unlock_bh(&np->np_thread_lock);
e48354ce 342 }
e48354ce
NB		 343
344 return NULL;
345}
346
347struct iscsi_np *iscsit_add_np(
13a3cf08 348 struct sockaddr_storage *sockaddr,
e48354ce
NB		 349 int network_transport)
350{
e48354ce
NB		 351 struct iscsi_np *np;
352 int ret;
ee291e63
AG		 353
354 mutex_lock(&np_lock);
355
e48354ce
NB		 356 /*
357 * Locate the existing struct iscsi_np if already active..
358 */
359 np = iscsit_get_np(sockaddr, network_transport);
ee291e63
AG		 360 if (np) {
361 mutex_unlock(&np_lock);
e48354ce 362 return np;
ee291e63 363 }
e48354ce
NB		 364
365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
366 if (!np) {
367 pr_err("Unable to allocate memory for struct iscsi_np\n");
ee291e63 368 mutex_unlock(&np_lock);
e48354ce
NB		 369 return ERR_PTR(-ENOMEM);
370 }
371
372 np->np_flags |= NPF_IP_NETWORK;
e48354ce
NB		 373 np->np_network_transport = network_transport;
374 spin_lock_init(&np->np_thread_lock);
375 init_completion(&np->np_restart_comp);
376 INIT_LIST_HEAD(&np->np_list);
377
378 ret = iscsi_target_setup_login_socket(np, sockaddr);
379 if (ret != 0) {
380 kfree(np);
ee291e63 381 mutex_unlock(&np_lock);
e48354ce
NB		 382 return ERR_PTR(ret);
383 }
384
385 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
386 if (IS_ERR(np->np_thread)) {
387 pr_err("Unable to create kthread: iscsi_np\n");
388 ret = PTR_ERR(np->np_thread);
389 kfree(np);
ee291e63 390 mutex_unlock(&np_lock);
e48354ce
NB		 391 return ERR_PTR(ret);
392 }
393 /*
394 * Increment the np_exports reference count now to prevent
395 * iscsit_del_np() below from being run while a new call to
396 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
397 * active. We don't need to hold np->np_thread_lock at this
398 * point because iscsi_np has not been added to g_np_list yet.
399 */
400 np->np_exports = 1;
ee291e63 401 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 402
e48354ce 403 list_add_tail(&np->np_list, &g_np_list);
ee291e63 404 mutex_unlock(&np_lock);
e48354ce 405
69d75574
AG		 406 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
407 &np->np_sockaddr, np->np_transport->name);
e48354ce
NB		 408
409 return np;
410}
411
412int iscsit_reset_np_thread(
413 struct iscsi_np *np,
414 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 415 struct iscsi_portal_group *tpg,
416 bool shutdown)
e48354ce
NB		 417{
418 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 419 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
420 spin_unlock_bh(&np->np_thread_lock);
421 return 0;
422 }
423 np->np_thread_state = ISCSI_NP_THREAD_RESET;
424
425 if (np->np_thread) {
426 spin_unlock_bh(&np->np_thread_lock);
427 send_sig(SIGINT, np->np_thread, 1);
428 wait_for_completion(&np->np_restart_comp);
429 spin_lock_bh(&np->np_thread_lock);
430 }
431 spin_unlock_bh(&np->np_thread_lock);
432
a91eb7d9
NB		 433 if (tpg_np && shutdown) {
434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
435
436 wait_for_completion(&tpg_np->tpg_np_comp);
437 }
438
e48354ce
NB		 439 return 0;
440}
441
baa4d64b 442static void iscsit_free_np(struct iscsi_np *np)
e48354ce 443{
bf6932f4
AV		 444 if (np->np_socket)
445 sock_release(np->np_socket);
e48354ce
NB		 446}
447
448int iscsit_del_np(struct iscsi_np *np)
449{
450 spin_lock_bh(&np->np_thread_lock);
451 np->np_exports--;
452 if (np->np_exports) {
2363d196 453 np->enabled = true;
e48354ce
NB		 454 spin_unlock_bh(&np->np_thread_lock);
455 return 0;
456 }
457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
458 spin_unlock_bh(&np->np_thread_lock);
459
460 if (np->np_thread) {
461 /*
462 * We need to send the signal to wakeup Linux/Net
463 * which may be sleeping in sock_accept()..
464 */
465 send_sig(SIGINT, np->np_thread, 1);
466 kthread_stop(np->np_thread);
db6077fd 467 np->np_thread = NULL;
e48354ce 468 }
baa4d64b
NB		 469
470 np->np_transport->iscsit_free_np(np);
e48354ce 471
ee291e63 472 mutex_lock(&np_lock);
e48354ce 473 list_del(&np->np_list);
ee291e63 474 mutex_unlock(&np_lock);
e48354ce 475
69d75574
AG		 476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
477 &np->np_sockaddr, np->np_transport->name);
e48354ce 478
baa4d64b 479 iscsit_put_transport(np->np_transport);
e48354ce
NB		 480 kfree(np);
481 return 0;
482}
483
e8205cca 484static void iscsit_get_rx_pdu(struct iscsi_conn *);
2ec5a8c1 485
d2faaefb 486int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2ec5a8c1
NB		 487{
488 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
489 return 0;
490}
d2faaefb 491EXPORT_SYMBOL(iscsit_queue_rsp);
2ec5a8c1 492
d2faaefb 493void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
131e6abc
NB		 494{
495 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
496
497 spin_lock_bh(&conn->cmd_lock);
064cdd2d
NB		 498 if (!list_empty(&cmd->i_conn_node) &&
499 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
131e6abc
NB		 500 list_del_init(&cmd->i_conn_node);
501 spin_unlock_bh(&conn->cmd_lock);
502
503 __iscsit_free_cmd(cmd, scsi_cmd, true);
504}
d2faaefb 505EXPORT_SYMBOL(iscsit_aborted_task);
131e6abc 506
2854bb23
VP		 507static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
508 u32, u32, u8 *, u8 *);
509static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
510
511static int
512iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
513 const void *data_buf, u32 data_buf_len)
514{
515 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
516 struct kvec *iov;
517 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
518 int ret;
519
520 iov = &cmd->iov_misc[0];
521 iov[niov].iov_base = cmd->pdu;
522 iov[niov++].iov_len = ISCSI_HDR_LEN;
523
524 if (conn->conn_ops->HeaderDigest) {
525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
526
527 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
528 ISCSI_HDR_LEN, 0, NULL,
529 (u8 *)header_digest);
530
531 iov[0].iov_len += ISCSI_CRC_LEN;
532 tx_size += ISCSI_CRC_LEN;
533 pr_debug("Attaching CRC32C HeaderDigest"
534 " to opcode 0x%x 0x%08x\n",
535 hdr->opcode, *header_digest);
536 }
537
538 if (data_buf_len) {
539 u32 padding = ((-data_buf_len) & 3);
540
541 iov[niov].iov_base = (void *)data_buf;
542 iov[niov++].iov_len = data_buf_len;
543 tx_size += data_buf_len;
544
545 if (padding != 0) {
546 iov[niov].iov_base = &cmd->pad_bytes;
547 iov[niov++].iov_len = padding;
548 tx_size += padding;
549 pr_debug("Attaching %u additional"
550 " padding bytes.\n", padding);
551 }
552
553 if (conn->conn_ops->DataDigest) {
554 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
555 data_buf, data_buf_len,
556 padding,
557 (u8 *)&cmd->pad_bytes,
558 (u8 *)&cmd->data_crc);
559
560 iov[niov].iov_base = &cmd->data_crc;
561 iov[niov++].iov_len = ISCSI_CRC_LEN;
562 tx_size += ISCSI_CRC_LEN;
563 pr_debug("Attached DataDigest for %u"
564 " bytes opcode 0x%x, CRC 0x%08x\n",
565 data_buf_len, hdr->opcode, cmd->data_crc);
566 }
567 }
568
569 cmd->iov_misc_count = niov;
570 cmd->tx_size = tx_size;
571
572 ret = iscsit_send_tx_data(cmd, conn, 1);
573 if (ret < 0) {
574 iscsit_tx_thread_wait_for_tcp(conn);
575 return ret;
576 }
577
578 return 0;
579}
580
581static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
582static void iscsit_unmap_iovec(struct iscsi_cmd *);
583static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
584 u32, u32, u32, u8 *);
585static int
586iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
587 const struct iscsi_datain *datain)
588{
589 struct kvec *iov;
590 u32 iov_count = 0, tx_size = 0;
591 int ret, iov_ret;
592
593 iov = &cmd->iov_data[0];
594 iov[iov_count].iov_base = cmd->pdu;
595 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
596 tx_size += ISCSI_HDR_LEN;
597
598 if (conn->conn_ops->HeaderDigest) {
599 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
600
601 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
602 ISCSI_HDR_LEN, 0, NULL,
603 (u8 *)header_digest);
604
605 iov[0].iov_len += ISCSI_CRC_LEN;
606 tx_size += ISCSI_CRC_LEN;
607
608 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
609 *header_digest);
610 }
611
612 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
613 datain->offset, datain->length);
614 if (iov_ret < 0)
615 return -1;
616
617 iov_count += iov_ret;
618 tx_size += datain->length;
619
620 cmd->padding = ((-datain->length) & 3);
621 if (cmd->padding) {
622 iov[iov_count].iov_base = cmd->pad_bytes;
623 iov[iov_count++].iov_len = cmd->padding;
624 tx_size += cmd->padding;
625
626 pr_debug("Attaching %u padding bytes\n", cmd->padding);
627 }
628
629 if (conn->conn_ops->DataDigest) {
630 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
631 cmd, datain->offset,
632 datain->length,
633 cmd->padding,
634 cmd->pad_bytes);
635
636 iov[iov_count].iov_base = &cmd->data_crc;
637 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
638 tx_size += ISCSI_CRC_LEN;
639
640 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
641 datain->length + cmd->padding, cmd->data_crc);
642 }
643
644 cmd->iov_data_count = iov_count;
645 cmd->tx_size = tx_size;
646
647 ret = iscsit_fe_sendpage_sg(cmd, conn);
648
649 iscsit_unmap_iovec(cmd);
650
651 if (ret < 0) {
652 iscsit_tx_thread_wait_for_tcp(conn);
653 return ret;
654 }
655
656 return 0;
657}
658
659static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
660 struct iscsi_datain_req *dr, const void *buf,
661 u32 buf_len)
662{
663 if (dr)
664 return iscsit_xmit_datain_pdu(conn, cmd, buf);
665 else
666 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
667}
668
e70beee7
NB		 669static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
670{
671 return TARGET_PROT_NORMAL;
672}
673
baa4d64b
NB		 674static struct iscsit_transport iscsi_target_transport = {
675 .name = "iSCSI/TCP",
676 .transport_type = ISCSI_TCP,
bd027d85 677 .rdma_shutdown = false,
baa4d64b
NB		 678 .owner = NULL,
679 .iscsit_setup_np = iscsit_setup_np,
680 .iscsit_accept_np = iscsit_accept_np,
681 .iscsit_free_np = iscsit_free_np,
682 .iscsit_get_login_rx = iscsit_get_login_rx,
683 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 684 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 685 .iscsit_immediate_queue = iscsit_immediate_queue,
686 .iscsit_response_queue = iscsit_response_queue,
687 .iscsit_queue_data_in = iscsit_queue_rsp,
688 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 689 .iscsit_aborted_task = iscsit_aborted_task,
2854bb23 690 .iscsit_xmit_pdu = iscsit_xmit_pdu,
e8205cca 691 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
e70beee7 692 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
baa4d64b
NB		 693};
694
e48354ce
NB		 695static int __init iscsi_target_init_module(void)
696{
88dcd2da 697 int ret = 0, size;
e48354ce
NB		 698
699 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
700
701 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
702 if (!iscsit_global) {
703 pr_err("Unable to allocate memory for iscsit_global\n");
704 return -1;
705 }
88dcd2da 706 spin_lock_init(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 707 mutex_init(&auth_id_lock);
708 spin_lock_init(&sess_idr_lock);
709 idr_init(&tiqn_idr);
710 idr_init(&sess_idr);
711
9ac8928e
CH		 712 ret = target_register_template(&iscsi_ops);
713 if (ret)
e48354ce
NB		 714 goto out;
715
88dcd2da
NB		 716 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
717 iscsit_global->ts_bitmap = vzalloc(size);
718 if (!iscsit_global->ts_bitmap) {
719 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
e48354ce 720 goto configfs_out;
e48354ce
NB		 721 }
722
e48354ce
NB		 723 lio_qr_cache = kmem_cache_create("lio_qr_cache",
724 sizeof(struct iscsi_queue_req),
725 __alignof__(struct iscsi_queue_req), 0, NULL);
726 if (!lio_qr_cache) {
727 pr_err("nable to kmem_cache_create() for"
728 " lio_qr_cache\n");
88dcd2da 729 goto bitmap_out;
e48354ce
NB		 730 }
731
732 lio_dr_cache = kmem_cache_create("lio_dr_cache",
733 sizeof(struct iscsi_datain_req),
734 __alignof__(struct iscsi_datain_req), 0, NULL);
735 if (!lio_dr_cache) {
736 pr_err("Unable to kmem_cache_create() for"
737 " lio_dr_cache\n");
738 goto qr_out;
739 }
740
741 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
742 sizeof(struct iscsi_ooo_cmdsn),
743 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
744 if (!lio_ooo_cache) {
745 pr_err("Unable to kmem_cache_create() for"
746 " lio_ooo_cache\n");
747 goto dr_out;
748 }
749
750 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
751 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
752 0, NULL);
753 if (!lio_r2t_cache) {
754 pr_err("Unable to kmem_cache_create() for"
755 " lio_r2t_cache\n");
756 goto ooo_out;
757 }
758
baa4d64b
NB		 759 iscsit_register_transport(&iscsi_target_transport);
760
e48354ce
NB		 761 if (iscsit_load_discovery_tpg() < 0)
762 goto r2t_out;
763
764 return ret;
765r2t_out:
7f2c53bb 766 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 767 kmem_cache_destroy(lio_r2t_cache);
768ooo_out:
769 kmem_cache_destroy(lio_ooo_cache);
770dr_out:
771 kmem_cache_destroy(lio_dr_cache);
772qr_out:
773 kmem_cache_destroy(lio_qr_cache);
88dcd2da
NB		 774bitmap_out:
775 vfree(iscsit_global->ts_bitmap);
e48354ce 776configfs_out:
9ac8928e
CH		 777 /* XXX: this probably wants it to be it's own unwind step.. */
778 if (iscsit_global->discovery_tpg)
779 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
780 target_unregister_template(&iscsi_ops);
e48354ce
NB		 781out:
782 kfree(iscsit_global);
783 return -ENOMEM;
784}
785
786static void __exit iscsi_target_cleanup_module(void)
787{
e48354ce 788 iscsit_release_discovery_tpg();
baa4d64b 789 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 790 kmem_cache_destroy(lio_qr_cache);
791 kmem_cache_destroy(lio_dr_cache);
792 kmem_cache_destroy(lio_ooo_cache);
793 kmem_cache_destroy(lio_r2t_cache);
794
9ac8928e
CH		 795 /*
796 * Shutdown discovery sessions and disable discovery TPG
797 */
798 if (iscsit_global->discovery_tpg)
799 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
e48354ce 800
9ac8928e 801 target_unregister_template(&iscsi_ops);
e48354ce 802
88dcd2da 803 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 804 kfree(iscsit_global);
805}
806
d2faaefb 807int iscsit_add_reject(
ba159914 808 struct iscsi_conn *conn,
e48354ce 809 u8 reason,
ba159914 810 unsigned char *buf)
e48354ce
NB		 811{
812 struct iscsi_cmd *cmd;
e48354ce 813
676687c6 814 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 815 if (!cmd)
816 return -1;
817
818 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 819 cmd->reject_reason = reason;
e48354ce 820
1c3d5794 821 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 822 if (!cmd->buf_ptr) {
823 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 824 iscsit_free_cmd(cmd, false);
e48354ce
NB		 825 return -1;
826 }
e48354ce
NB		 827
828 spin_lock_bh(&conn->cmd_lock);
2fbb471e 829 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 830 spin_unlock_bh(&conn->cmd_lock);
831
832 cmd->i_state = ISTATE_SEND_REJECT;
833 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
834
ba159914 835 return -1;
e48354ce 836}
d2faaefb 837EXPORT_SYMBOL(iscsit_add_reject);
e48354ce 838
ba159914
NB		 839static int iscsit_add_reject_from_cmd(
840 struct iscsi_cmd *cmd,
e48354ce 841 u8 reason,
ba159914
NB		 842 bool add_to_conn,
843 unsigned char *buf)
e48354ce
NB		 844{
845 struct iscsi_conn *conn;
e48354ce
NB		 846
847 if (!cmd->conn) {
848 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
849 cmd->init_task_tag);
850 return -1;
851 }
852 conn = cmd->conn;
853
854 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 855 cmd->reject_reason = reason;
e48354ce 856
1c3d5794 857 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 858 if (!cmd->buf_ptr) {
859 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 860 iscsit_free_cmd(cmd, false);
e48354ce
NB		 861 return -1;
862 }
e48354ce
NB		 863
864 if (add_to_conn) {
865 spin_lock_bh(&conn->cmd_lock);
2fbb471e 866 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 867 spin_unlock_bh(&conn->cmd_lock);
868 }
869
870 cmd->i_state = ISTATE_SEND_REJECT;
871 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 872 /*
873 * Perform the kref_put now if se_cmd has already been setup by
874 * scsit_setup_scsi_cmd()
875 */
876 if (cmd->se_cmd.se_tfo != NULL) {
877 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
afc16604 878 target_put_sess_cmd(&cmd->se_cmd);
3e1c81a9 879 }
ba159914
NB		 880 return -1;
881}
e48354ce 882
ba159914
NB		 883static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
884 unsigned char *buf)
885{
886 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
887}
888
889int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
890{
891 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce 892}
d2faaefb 893EXPORT_SYMBOL(iscsit_reject_cmd);
e48354ce
NB		 894
895/*
896 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 897 * kernel sockets to copy data in/out.
e48354ce
NB		 898 */
899static int iscsit_map_iovec(
900 struct iscsi_cmd *cmd,
901 struct kvec *iov,
902 u32 data_offset,
903 u32 data_length)
904{
905 u32 i = 0;
906 struct scatterlist *sg;
907 unsigned int page_off;
908
909 /*
bfb79eac 910 * We know each entry in t_data_sg contains a page.
e48354ce 911 */
2b16509c
IH		 912 u32 ent = data_offset / PAGE_SIZE;
913
914 if (ent >= cmd->se_cmd.t_data_nents) {
915 pr_err("Initial page entry out-of-bounds\n");
916 return -1;
917 }
918
919 sg = &cmd->se_cmd.t_data_sg[ent];
e48354ce
NB		 920 page_off = (data_offset % PAGE_SIZE);
921
922 cmd->first_data_sg = sg;
923 cmd->first_data_sg_off = page_off;
924
925 while (data_length) {
926 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
927
928 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
929 iov[i].iov_len = cur_len;
930
931 data_length -= cur_len;
932 page_off = 0;
933 sg = sg_next(sg);
934 i++;
935 }
936
937 cmd->kmapped_nents = i;
938
939 return i;
940}
941
942static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
943{
944 u32 i;
945 struct scatterlist *sg;
946
947 sg = cmd->first_data_sg;
948
949 for (i = 0; i < cmd->kmapped_nents; i++)
950 kunmap(sg_page(&sg[i]));
951}
952
953static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
954{
f56cbbb4
NB		 955 LIST_HEAD(ack_list);
956 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 957
958 conn->exp_statsn = exp_statsn;
959
3e1c81a9
NB		 960 if (conn->sess->sess_ops->RDMAExtensions)
961 return;
962
e48354ce 963 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 964 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 965 spin_lock(&cmd->istate_lock);
966 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 967 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 968 cmd->i_state = ISTATE_REMOVE;
969 spin_unlock(&cmd->istate_lock);
f56cbbb4 970 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 971 continue;
972 }
973 spin_unlock(&cmd->istate_lock);
974 }
975 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 976
977 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 978 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 979 iscsit_free_cmd(cmd, false);
980 }
e48354ce
NB		 981}
982
983static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
984{
f80e8ed3 985 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 986
c0427f15 987 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 988
989 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
990 if (!cmd->iov_data) {
991 pr_err("Unable to allocate cmd->iov_data\n");
992 return -ENOMEM;
993 }
994
995 cmd->orig_iov_data_count = iov_count;
996 return 0;
997}
998
3e1c81a9
NB		 999int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1000 unsigned char *buf)
e48354ce 1001{
3e1c81a9 1002 int data_direction, payload_length;
e48354ce 1003 struct iscsi_scsi_req *hdr;
d28b1169
AG		 1004 int iscsi_task_attr;
1005 int sam_task_attr;
e48354ce 1006
04f3b31b 1007 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 1008
1009 hdr = (struct iscsi_scsi_req *) buf;
1010 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 1011
1012 /* FIXME; Add checks for AdditionalHeaderSegment */
1013
1014 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1015 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1016 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1017 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 1018 return iscsit_add_reject_cmd(cmd,
1019 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1020 }
1021
1022 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1023 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1024 /*
4454b66c
NB		 1025 * From RFC-3720 Section 10.3.1:
1026 *
1027 * "Either or both of R and W MAY be 1 when either the
1028 * Expected Data Transfer Length and/or Bidirectional Read
1029 * Expected Data Transfer Length are 0"
1030 *
1031 * For this case, go ahead and clear the unnecssary bits
1032 * to avoid any confusion with ->data_direction.
e48354ce 1033 */
4454b66c
NB		 1034 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1035 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 1036
4454b66c 1037 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 1038 " set when Expected Data Transfer Length is 0 for"
4454b66c 1039 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 1040 }
e48354ce
NB		 1041
1042 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1043 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1044 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1045 " MUST be set if Expected Data Transfer Length is not 0."
1046 " Bad iSCSI Initiator\n");
ba159914
NB		 1047 return iscsit_add_reject_cmd(cmd,
1048 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1049 }
1050
1051 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1052 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1053 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 1054 return iscsit_add_reject_cmd(cmd,
1055 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1056 }
1057
1058 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1059 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1060 " Scsi Command PDU.\n");
ba159914
NB		 1061 return iscsit_add_reject_cmd(cmd,
1062 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1063 }
1064
1065 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1066 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1067 " protocol error.\n", payload_length);
ba159914
NB		 1068 return iscsit_add_reject_cmd(cmd,
1069 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1070 }
1071
ba159914 1072 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 1073 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1074 pr_err("Expected Data Transfer Length and Length of"
1075 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1076 " bit is not set protocol error\n");
ba159914
NB		 1077 return iscsit_add_reject_cmd(cmd,
1078 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1079 }
1080
50e5c87d 1081 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 1082 pr_err("DataSegmentLength: %u is greater than"
1083 " EDTL: %u, protocol error.\n", payload_length,
1084 hdr->data_length);
ba159914
NB		 1085 return iscsit_add_reject_cmd(cmd,
1086 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1087 }
1088
21f5aa7e 1089 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1090 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1091 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1092 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1093 return iscsit_add_reject_cmd(cmd,
1094 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1095 }
1096
1097 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1098 pr_err("DataSegmentLength: %u is greater than"
1099 " FirstBurstLength: %u, protocol error.\n",
1100 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 1101 return iscsit_add_reject_cmd(cmd,
1102 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1103 }
1104
1105 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1106 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1107 DMA_NONE;
1108
d28b1169 1109 cmd->data_direction = data_direction;
d28b1169
AG		 1110 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1111 /*
1112 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1113 */
1114 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1115 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
68d81f40 1116 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169 1117 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
68d81f40 1118 sam_task_attr = TCM_ORDERED_TAG;
d28b1169 1119 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
68d81f40 1120 sam_task_attr = TCM_HEAD_TAG;
d28b1169 1121 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
68d81f40 1122 sam_task_attr = TCM_ACA_TAG;
d28b1169
AG		 1123 else {
1124 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
68d81f40
CH		 1125 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1126 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169
AG		 1127 }
1128
e48354ce
NB		 1129 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1130 cmd->i_state = ISTATE_NEW_CMD;
1131 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1132 cmd->immediate_data = (payload_length) ? 1 : 0;
1133 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1134 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1135 if (cmd->unsolicited_data)
1136 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1137
1138 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
9547308b 1139 if (hdr->flags & ISCSI_FLAG_CMD_READ)
c1e34b64 1140 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
9547308b 1141 else
e48354ce 1142 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1143 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1144 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1145 cmd->first_burst_len = payload_length;
1146
3e1c81a9
NB		 1147 if (!conn->sess->sess_ops->RDMAExtensions &&
1148 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 1149 struct iscsi_datain_req *dr;
1150
1151 dr = iscsit_allocate_datain_req();
1152 if (!dr)
ba159914
NB		 1153 return iscsit_add_reject_cmd(cmd,
1154 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1155
1156 iscsit_attach_datain_req(cmd, dr);
1157 }
1158
065ca1e4
AG		 1159 /*
1160 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1161 */
9ac8928e 1162 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
50e5c87d
CH		 1163 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1164 cmd->data_direction, sam_task_attr,
1165 cmd->sense_buffer + 2);
065ca1e4
AG		 1166
1167 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1168 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 1169 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1170 conn->cid);
1171
afc16604 1172 target_get_sess_cmd(&cmd->se_cmd, true);
065ca1e4 1173
de103c93
CH		 1174 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1175 scsilun_to_int(&hdr->lun));
1176 if (cmd->sense_reason)
1177 goto attach_cmd;
1178
649ee054
BVA		 1179 /* only used for printks or comparing with ->ref_task_tag */
1180 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
de103c93
CH		 1181 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1182 if (cmd->sense_reason) {
1183 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1184 return iscsit_add_reject_cmd(cmd,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1186 }
de103c93 1187
e48354ce
NB		 1188 goto attach_cmd;
1189 }
a12f41f8 1190
de103c93 1191 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1192 return iscsit_add_reject_cmd(cmd,
1193 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1194 }
1195
1196attach_cmd:
1197 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1198 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1199 spin_unlock_bh(&conn->cmd_lock);
1200 /*
1201 * Check if we need to delay processing because of ALUA
1202 * Active/NonOptimized primary access state..
1203 */
1204 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1205
3e1c81a9
NB		 1206 return 0;
1207}
1208EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1209
3e1c81a9
NB		 1210void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1211{
1212 iscsit_set_dataout_sequence_values(cmd);
1213
1214 spin_lock_bh(&cmd->dataout_timeout_lock);
1215 iscsit_start_dataout_timer(cmd, cmd->conn);
1216 spin_unlock_bh(&cmd->dataout_timeout_lock);
1217}
1218EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1219
1220int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1221 struct iscsi_scsi_req *hdr)
1222{
1223 int cmdsn_ret = 0;
e48354ce
NB		 1224 /*
1225 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1226 * the Immediate Bit is not set, and no Immediate
1227 * Data is attached.
1228 *
1229 * A PDU/CmdSN carrying Immediate Data can only
1230 * be processed after the DataCRC has passed.
1231 * If the DataCRC fails, the CmdSN MUST NOT
1232 * be acknowledged. (See below)
1233 */
1234 if (!cmd->immediate_data) {
561bf158
NB		 1235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1236 (unsigned char *)hdr, hdr->cmdsn);
1237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1238 return -1;
1239 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
afc16604 1240 target_put_sess_cmd(&cmd->se_cmd);
7e32da55 1241 return 0;
3e1c81a9 1242 }
e48354ce
NB		 1243 }
1244
50e5c87d 1245 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1246
1247 /*
1248 * If no Immediate Data is attached, it's OK to return now.
1249 */
1250 if (!cmd->immediate_data) {
3e1c81a9
NB		 1251 if (!cmd->sense_reason && cmd->unsolicited_data)
1252 iscsit_set_unsoliticed_dataout(cmd);
1253 if (!cmd->sense_reason)
1254 return 0;
e48354ce 1255
afc16604 1256 target_put_sess_cmd(&cmd->se_cmd);
e48354ce
NB		 1257 return 0;
1258 }
1259
1260 /*
3e1c81a9
NB		 1261 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1262 * execution. These exceptions are processed in CmdSN order using
1263 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1264 */
de103c93 1265 if (cmd->sense_reason) {
561bf158
NB		 1266 if (cmd->reject_reason)
1267 return 0;
1268
3e1c81a9 1269 return 1;
e48354ce
NB		 1270 }
1271 /*
1272 * Call directly into transport_generic_new_cmd() to perform
1273 * the backend memory allocation.
1274 */
de103c93 1275 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1276 if (cmd->sense_reason)
3e1c81a9 1277 return 1;
e48354ce 1278
3e1c81a9
NB		 1279 return 0;
1280}
1281EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1282
1283static int
1284iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1285 bool dump_payload)
1286{
1287 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1288 /*
1289 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1290 */
0bcc297e 1291 if (dump_payload)
3e1c81a9
NB		 1292 goto after_immediate_data;
1293
1294 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1295 cmd->first_burst_len);
e48354ce
NB		 1296after_immediate_data:
1297 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1298 /*
1299 * A PDU/CmdSN carrying Immediate Data passed
1300 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1301 * Immediate Bit is not set.
1302 */
561bf158
NB		 1303 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1304 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1305 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1306 return -1;
3e1c81a9 1307
9d86a2be 1308 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1309 int rc;
1310
1311 rc = iscsit_dump_data_payload(cmd->conn,
1312 cmd->first_burst_len, 1);
afc16604 1313 target_put_sess_cmd(&cmd->se_cmd);
561bf158 1314 return rc;
3e1c81a9
NB		 1315 } else if (cmd->unsolicited_data)
1316 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1317
e48354ce
NB		 1318 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1319 /*
1320 * Immediate Data failed DataCRC and ERL>=1,
1321 * silently drop this PDU and let the initiator
1322 * plug the CmdSN gap.
1323 *
1324 * FIXME: Send Unsolicited NOPIN with reserved
1325 * TTT here to help the initiator figure out
1326 * the missing CmdSN, although they should be
1327 * intelligent enough to determine the missing
1328 * CmdSN and issue a retry to plug the sequence.
1329 */
1330 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1331 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1332 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1333 return -1;
1334
1335 return 0;
1336}
1337
3e1c81a9
NB		 1338static int
1339iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1340 unsigned char *buf)
1341{
1342 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1343 int rc, immed_data;
1344 bool dump_payload = false;
1345
1346 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1347 if (rc < 0)
561bf158 1348 return 0;
3e1c81a9
NB		 1349 /*
1350 * Allocation iovecs needed for struct socket operations for
1351 * traditional iSCSI block I/O.
1352 */
1353 if (iscsit_allocate_iovecs(cmd) < 0) {
b815fc12 1354 return iscsit_reject_cmd(cmd,
ba159914 1355 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1356 }
1357 immed_data = cmd->immediate_data;
1358
1359 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1360 if (rc < 0)
1361 return rc;
1362 else if (rc > 0)
1363 dump_payload = true;
1364
1365 if (!immed_data)
1366 return 0;
1367
1368 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1369}
1370
e48354ce 1371static u32 iscsit_do_crypto_hash_sg(
69110e3c 1372 struct ahash_request *hash,
e48354ce
NB		 1373 struct iscsi_cmd *cmd,
1374 u32 data_offset,
1375 u32 data_length,
1376 u32 padding,
1377 u8 *pad_bytes)
1378{
1379 u32 data_crc;
e48354ce
NB		 1380 struct scatterlist *sg;
1381 unsigned int page_off;
1382
69110e3c 1383 crypto_ahash_init(hash);
e48354ce
NB		 1384
1385 sg = cmd->first_data_sg;
1386 page_off = cmd->first_data_sg_off;
1387
e48354ce 1388 while (data_length) {
aa75679c 1389 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
e48354ce 1390
69110e3c
HX		 1391 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1392 crypto_ahash_update(hash);
e48354ce
NB		 1393
1394 data_length -= cur_len;
1395 page_off = 0;
aa75679c
AP		 1396 /* iscsit_map_iovec has already checked for invalid sg pointers */
1397 sg = sg_next(sg);
e48354ce
NB		 1398 }
1399
1400 if (padding) {
1401 struct scatterlist pad_sg;
1402
1403 sg_init_one(&pad_sg, pad_bytes, padding);
69110e3c
HX		 1404 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1405 padding);
1406 crypto_ahash_finup(hash);
1407 } else {
1408 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1409 crypto_ahash_final(hash);
e48354ce 1410 }
e48354ce
NB		 1411
1412 return data_crc;
1413}
1414
1415static void iscsit_do_crypto_hash_buf(
69110e3c 1416 struct ahash_request *hash,
80690fdb 1417 const void *buf,
e48354ce
NB		 1418 u32 payload_length,
1419 u32 padding,
1420 u8 *pad_bytes,
1421 u8 *data_crc)
1422{
69110e3c 1423 struct scatterlist sg[2];
e48354ce 1424
69110e3c
HX		 1425 sg_init_table(sg, ARRAY_SIZE(sg));
1426 sg_set_buf(sg, buf, payload_length);
1427 sg_set_buf(sg + 1, pad_bytes, padding);
e48354ce 1428
69110e3c 1429 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
e48354ce 1430
69110e3c 1431 crypto_ahash_digest(hash);
e48354ce
NB		 1432}
1433
3e1c81a9 1434int
9a584bf9
VP		 1435__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1436 struct iscsi_cmd *cmd, u32 payload_length,
1437 bool *success)
e48354ce 1438{
9a584bf9 1439 struct iscsi_data *hdr = buf;
e48354ce 1440 struct se_cmd *se_cmd;
3e1c81a9 1441 int rc;
e48354ce 1442
e48354ce 1443 /* iSCSI write */
04f3b31b 1444 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1445
e48354ce
NB		 1446 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1447 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1448 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1449 payload_length, conn->cid);
1450
1451 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1452 pr_err("Command ITT: 0x%08x received DataOUT after"
1453 " last DataOUT received, dumping payload\n",
1454 cmd->init_task_tag);
1455 return iscsit_dump_data_payload(conn, payload_length, 1);
1456 }
1457
1458 if (cmd->data_direction != DMA_TO_DEVICE) {
1459 pr_err("Command ITT: 0x%08x received DataOUT for a"
1460 " NON-WRITE command.\n", cmd->init_task_tag);
97c99b47 1461 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1462 }
1463 se_cmd = &cmd->se_cmd;
1464 iscsit_mod_dataout_timer(cmd);
1465
50e5c87d 1466 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1467 pr_err("DataOut Offset: %u, Length %u greater than"
1468 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1469 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1470 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1471 }
1472
1473 if (cmd->unsolicited_data) {
1474 int dump_unsolicited_data = 0;
1475
1476 if (conn->sess->sess_ops->InitialR2T) {
1477 pr_err("Received unexpected unsolicited data"
1478 " while InitialR2T=Yes, protocol error.\n");
1479 transport_send_check_condition_and_sense(&cmd->se_cmd,
1480 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1481 return -1;
1482 }
1483 /*
1484 * Special case for dealing with Unsolicited DataOUT
1485 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1486 * failures;
1487 */
1488
1489 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1490 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1491 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1492 dump_unsolicited_data = 1;
e48354ce
NB		 1493
1494 if (dump_unsolicited_data) {
1495 /*
1496 * Check if a delayed TASK_ABORTED status needs to
1497 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
5a342521 1498 * received with the unsolicited data out.
e48354ce
NB		 1499 */
1500 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1501 iscsit_stop_dataout_timer(cmd);
1502
1503 transport_check_aborted_status(se_cmd,
1504 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1505 return iscsit_dump_data_payload(conn, payload_length, 1);
1506 }
1507 } else {
1508 /*
1509 * For the normal solicited data path:
1510 *
1511 * Check for a delayed TASK_ABORTED status and dump any
1512 * incoming data out payload if one exists. Also, when the
1513 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1514 * data out sequence, we decrement outstanding_r2ts. Once
1515 * outstanding_r2ts reaches zero, go ahead and send the delayed
1516 * TASK_ABORTED status.
1517 */
7d680f3b 1518 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1519 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1520 if (--cmd->outstanding_r2ts < 1) {
1521 iscsit_stop_dataout_timer(cmd);
1522 transport_check_aborted_status(
1523 se_cmd, 1);
1524 }
1525
1526 return iscsit_dump_data_payload(conn, payload_length, 1);
1527 }
1528 }
1529 /*
0d5efb8a 1530 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
e48354ce
NB		 1531 * within-command recovery checks before receiving the payload.
1532 */
3e1c81a9
NB		 1533 rc = iscsit_check_pre_dataout(cmd, buf);
1534 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1535 return 0;
3e1c81a9 1536 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce 1537 return -1;
9a584bf9 1538 *success = true;
3e1c81a9
NB		 1539 return 0;
1540}
9a584bf9
VP		 1541EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1542
1543int
1544iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1545 struct iscsi_cmd **out_cmd)
1546{
1547 struct iscsi_data *hdr = buf;
1548 struct iscsi_cmd *cmd;
1549 u32 payload_length = ntoh24(hdr->dlength);
1550 int rc;
1551 bool success = false;
1552
1553 if (!payload_length) {
1554 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1555 return 0;
1556 }
1557
1558 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1559 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1560 " MaxXmitDataSegmentLength: %u\n", payload_length,
1561 conn->conn_ops->MaxXmitDataSegmentLength);
1562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1563 }
1564
1565 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1566 if (!cmd)
1567 return 0;
1568
1569 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1570
1571 if (success)
1572 *out_cmd = cmd;
1573
1574 return rc;
1575}
3e1c81a9
NB		 1576EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1577
1578static int
1579iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1580 struct iscsi_data *hdr)
1581{
1582 struct kvec *iov;
1583 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1584 u32 payload_length = ntoh24(hdr->dlength);
1585 int iov_ret, data_crc_failed = 0;
1586
e48354ce
NB		 1587 rx_size += payload_length;
1588 iov = &cmd->iov_data[0];
1589
50e5c87d
CH		 1590 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1591 payload_length);
e48354ce
NB		 1592 if (iov_ret < 0)
1593 return -1;
1594
1595 iov_count += iov_ret;
1596
1597 padding = ((-payload_length) & 3);
1598 if (padding != 0) {
1599 iov[iov_count].iov_base = cmd->pad_bytes;
1600 iov[iov_count++].iov_len = padding;
1601 rx_size += padding;
1602 pr_debug("Receiving %u padding bytes.\n", padding);
1603 }
1604
1605 if (conn->conn_ops->DataDigest) {
1606 iov[iov_count].iov_base = &checksum;
1607 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1608 rx_size += ISCSI_CRC_LEN;
1609 }
1610
1611 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1612
1613 iscsit_unmap_iovec(cmd);
1614
1615 if (rx_got != rx_size)
1616 return -1;
1617
1618 if (conn->conn_ops->DataDigest) {
1619 u32 data_crc;
1620
69110e3c 1621 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
50e5c87d
CH		 1622 be32_to_cpu(hdr->offset),
1623 payload_length, padding,
e48354ce
NB		 1624 cmd->pad_bytes);
1625
1626 if (checksum != data_crc) {
1627 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1628 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1629 " does not match computed 0x%08x\n",
1630 hdr->itt, hdr->offset, payload_length,
1631 hdr->datasn, checksum, data_crc);
1632 data_crc_failed = 1;
1633 } else {
1634 pr_debug("Got CRC32C DataDigest 0x%08x for"
1635 " %u bytes of Data Out\n", checksum,
1636 payload_length);
1637 }
1638 }
3e1c81a9
NB		 1639
1640 return data_crc_failed;
1641}
1642
1643int
1644iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1645 bool data_crc_failed)
1646{
1647 struct iscsi_conn *conn = cmd->conn;
1648 int rc, ooo_cmdsn;
e48354ce
NB		 1649 /*
1650 * Increment post receive data and CRC values or perform
1651 * within-command recovery.
1652 */
3e1c81a9
NB		 1653 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1654 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1655 return 0;
3e1c81a9 1656 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1657 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1658 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1659 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1660 /*
1661 * Handle extra special case for out of order
1662 * Unsolicited Data Out.
1663 */
1664 spin_lock_bh(&cmd->istate_lock);
1665 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1666 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1667 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1668 spin_unlock_bh(&cmd->istate_lock);
1669
1670 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1671 if (ooo_cmdsn)
1672 return 0;
1673 target_execute_cmd(&cmd->se_cmd);
1674 return 0;
e48354ce
NB		 1675 } else /* DATAOUT_CANNOT_RECOVER */
1676 return -1;
1677
1678 return 0;
1679}
3e1c81a9 1680EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1681
3e1c81a9
NB		 1682static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1683{
dbcbc95c 1684 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1685 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1686 int rc;
1687 bool data_crc_failed = false;
1688
1689 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1690 if (rc < 0)
561bf158 1691 return 0;
3e1c81a9
NB		 1692 else if (!cmd)
1693 return 0;
1694
1695 rc = iscsit_get_dataout(conn, cmd, hdr);
1696 if (rc < 0)
1697 return rc;
1698 else if (rc > 0)
1699 data_crc_failed = true;
1700
1701 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1702}
1703
778de368
NB		 1704int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1705 struct iscsi_nopout *hdr)
e48354ce 1706{
778de368 1707 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1708
a3662605
AH		 1709 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1710 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1711 if (!cmd)
1712 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1713 (unsigned char *)hdr);
1714
1715 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1716 (unsigned char *)hdr);
1717 }
1718
66c7db68 1719 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1720 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1721 " not set, protocol error.\n");
28aaa950
NB		 1722 if (!cmd)
1723 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724 (unsigned char *)hdr);
1725
ba159914
NB		 1726 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727 (unsigned char *)hdr);
e48354ce
NB		 1728 }
1729
21f5aa7e 1730 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1731 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1732 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1733 " error.\n", payload_length,
21f5aa7e 1734 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1735 if (!cmd)
1736 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
1738
ba159914
NB		 1739 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1740 (unsigned char *)hdr);
e48354ce
NB		 1741 }
1742
3e1c81a9 1743 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1744 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1745 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1746 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1747 payload_length);
1748 /*
1749 * This is not a response to a Unsolicited NopIN, which means
1750 * it can either be a NOPOUT ping request (with a valid ITT),
1751 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1752 * Either way, make sure we allocate an struct iscsi_cmd, as both
1753 * can contain ping data.
1754 */
50e5c87d 1755 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1756 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1757 cmd->i_state = ISTATE_SEND_NOPIN;
1758 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1759 1 : 0);
1760 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1761 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1762 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1763 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1764 cmd->data_direction = DMA_NONE;
1765 }
1766
778de368
NB		 1767 return 0;
1768}
1769EXPORT_SYMBOL(iscsit_setup_nop_out);
1770
1771int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1772 struct iscsi_nopout *hdr)
1773{
1774 struct iscsi_cmd *cmd_p = NULL;
1775 int cmdsn_ret = 0;
1776 /*
1777 * Initiator is expecting a NopIN ping reply..
1778 */
1779 if (hdr->itt != RESERVED_ITT) {
7cbfcc95
NB		 1780 if (!cmd)
1781 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1782 (unsigned char *)hdr);
778de368
NB		 1783
1784 spin_lock_bh(&conn->cmd_lock);
1785 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1786 spin_unlock_bh(&conn->cmd_lock);
1787
1788 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1789
1790 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1791 iscsit_add_cmd_to_response_queue(cmd, conn,
1792 cmd->i_state);
1793 return 0;
1794 }
1795
561bf158
NB		 1796 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1797 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1798 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1799 return 0;
778de368 1800 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1801 return -1;
778de368
NB		 1802
1803 return 0;
1804 }
1805 /*
1806 * This was a response to a unsolicited NOPIN ping.
1807 */
1808 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1809 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1810 if (!cmd_p)
1811 return -EINVAL;
1812
1813 iscsit_stop_nopin_response_timer(conn);
1814
1815 cmd_p->i_state = ISTATE_REMOVE;
1816 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1817
1818 iscsit_start_nopin_timer(conn);
1819 return 0;
1820 }
1821 /*
1822 * Otherwise, initiator is not expecting a NOPIN is response.
1823 * Just ignore for now.
1824 */
1a40f0a3
VP		 1825
1826 if (cmd)
1827 iscsit_free_cmd(cmd, false);
1828
778de368
NB		 1829 return 0;
1830}
1831EXPORT_SYMBOL(iscsit_process_nop_out);
1832
1833static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1834 unsigned char *buf)
1835{
1836 unsigned char *ping_data = NULL;
1837 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1838 struct kvec *iov = NULL;
1839 u32 payload_length = ntoh24(hdr->dlength);
1840 int ret;
1841
1842 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1843 if (ret < 0)
561bf158 1844 return 0;
778de368
NB		 1845 /*
1846 * Handle NOP-OUT payload for traditional iSCSI sockets
1847 */
50e5c87d 1848 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1849 u32 checksum, data_crc, padding = 0;
1850 int niov = 0, rx_got, rx_size = payload_length;
1851
e48354ce
NB		 1852 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1853 if (!ping_data) {
1854 pr_err("Unable to allocate memory for"
1855 " NOPOUT ping data.\n");
1856 ret = -1;
1857 goto out;
1858 }
1859
1860 iov = &cmd->iov_misc[0];
1861 iov[niov].iov_base = ping_data;
1862 iov[niov++].iov_len = payload_length;
1863
1864 padding = ((-payload_length) & 3);
1865 if (padding != 0) {
1866 pr_debug("Receiving %u additional bytes"
1867 " for padding.\n", padding);
1868 iov[niov].iov_base = &cmd->pad_bytes;
1869 iov[niov++].iov_len = padding;
1870 rx_size += padding;
1871 }
1872 if (conn->conn_ops->DataDigest) {
1873 iov[niov].iov_base = &checksum;
1874 iov[niov++].iov_len = ISCSI_CRC_LEN;
1875 rx_size += ISCSI_CRC_LEN;
1876 }
1877
1878 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1879 if (rx_got != rx_size) {
1880 ret = -1;
1881 goto out;
1882 }
1883
1884 if (conn->conn_ops->DataDigest) {
69110e3c 1885 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
e48354ce
NB		 1886 ping_data, payload_length,
1887 padding, cmd->pad_bytes,
1888 (u8 *)&data_crc);
1889
1890 if (checksum != data_crc) {
1891 pr_err("Ping data CRC32C DataDigest"
1892 " 0x%08x does not match computed 0x%08x\n",
1893 checksum, data_crc);
1894 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1895 pr_err("Unable to recover from"
1896 " NOPOUT Ping DataCRC failure while in"
1897 " ERL=0.\n");
1898 ret = -1;
1899 goto out;
1900 } else {
1901 /*
1902 * Silently drop this PDU and let the
1903 * initiator plug the CmdSN gap.
1904 */
1905 pr_debug("Dropping NOPOUT"
1906 " Command CmdSN: 0x%08x due to"
1907 " DataCRC error.\n", hdr->cmdsn);
1908 ret = 0;
1909 goto out;
1910 }
1911 } else {
1912 pr_debug("Got CRC32C DataDigest"
1913 " 0x%08x for %u bytes of ping data.\n",
1914 checksum, payload_length);
1915 }
1916 }
1917
1918 ping_data[payload_length] = '\0';
1919 /*
1920 * Attach ping data to struct iscsi_cmd->buf_ptr.
1921 */
8359cf43 1922 cmd->buf_ptr = ping_data;
e48354ce
NB		 1923 cmd->buf_ptr_size = payload_length;
1924
1925 pr_debug("Got %u bytes of NOPOUT ping"
1926 " data.\n", payload_length);
1927 pr_debug("Ping Data: \"%s\"\n", ping_data);
1928 }
1929
778de368 1930 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1931out:
1932 if (cmd)
aafc9d15 1933 iscsit_free_cmd(cmd, false);
778de368 1934
e48354ce
NB		 1935 kfree(ping_data);
1936 return ret;
1937}
1938
e381fe9e
BVA		 1939static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1940{
1941 switch (iscsi_tmf) {
1942 case ISCSI_TM_FUNC_ABORT_TASK:
1943 return TMR_ABORT_TASK;
1944 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1945 return TMR_ABORT_TASK_SET;
1946 case ISCSI_TM_FUNC_CLEAR_ACA:
1947 return TMR_CLEAR_ACA;
1948 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1949 return TMR_CLEAR_TASK_SET;
1950 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1951 return TMR_LUN_RESET;
1952 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1953 return TMR_TARGET_WARM_RESET;
1954 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1955 return TMR_TARGET_COLD_RESET;
1956 default:
1957 return TMR_UNKNOWN;
1958 }
1959}
1960
3e1c81a9
NB		 1961int
1962iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1963 unsigned char *buf)
e48354ce 1964{
e48354ce
NB		 1965 struct se_tmr_req *se_tmr;
1966 struct iscsi_tmr_req *tmr_req;
1967 struct iscsi_tm *hdr;
186a9647
NB		 1968 int out_of_order_cmdsn = 0, ret;
1969 bool sess_ref = false;
59b6986d 1970 u8 function, tcm_function = TMR_UNKNOWN;
e48354ce
NB		 1971
1972 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1973 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1974 function = hdr->flags;
1975
1976 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1977 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1978 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1979 hdr->rtt, hdr->refcmdsn, conn->cid);
1980
1981 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1982 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1983 hdr->rtt != RESERVED_ITT)) {
e48354ce 1984 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1985 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1986 }
1987
1988 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1989 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1990 pr_err("Task Management Request TASK_REASSIGN not"
1991 " issued as immediate command, bad iSCSI Initiator"
1992 "implementation\n");
ba159914
NB		 1993 return iscsit_add_reject_cmd(cmd,
1994 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1995 }
1996 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1997 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1998 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1999
d28b1169
AG		 2000 cmd->data_direction = DMA_NONE;
2001
2002 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
2003 if (!cmd->tmr_req) {
2004 pr_err("Unable to allocate memory for"
2005 " Task Management command!\n");
ba159914
NB		 2006 return iscsit_add_reject_cmd(cmd,
2007 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2008 buf);
d28b1169
AG		 2009 }
2010
2011 /*
2012 * TASK_REASSIGN for ERL=2 / connection stays inside of
2013 * LIO-Target $FABRIC_MOD
2014 */
2015 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
9ac8928e 2016 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
d28b1169 2017 conn->sess->se_sess, 0, DMA_NONE,
68d81f40 2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 2019
afc16604 2020 target_get_sess_cmd(&cmd->se_cmd, true);
186a9647 2021 sess_ref = true;
e381fe9e
BVA		 2022 tcm_function = iscsit_convert_tmf(function);
2023 if (tcm_function == TMR_UNKNOWN) {
d28b1169
AG		 2024 pr_err("Unknown iSCSI TMR Function:"
2025 " 0x%02x\n", function);
ba159914
NB		 2026 return iscsit_add_reject_cmd(cmd,
2027 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2028 }
59b6986d
BVA		 2029 }
2030 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2031 GFP_KERNEL);
2032 if (ret < 0)
2033 return iscsit_add_reject_cmd(cmd,
ba159914 2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2035
59b6986d 2036 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
e48354ce
NB		 2037
2038 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2039 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2040 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2041 cmd->init_task_tag = hdr->itt;
2042 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2043 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2044 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2045 se_tmr = cmd->se_cmd.se_tmr_req;
2046 tmr_req = cmd->tmr_req;
2047 /*
2048 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2049 */
2050 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 2051 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2052 scsilun_to_int(&hdr->lun));
e48354ce 2053 if (ret < 0) {
e48354ce
NB		 2054 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2055 goto attach;
2056 }
2057 }
2058
2059 switch (function) {
2060 case ISCSI_TM_FUNC_ABORT_TASK:
2061 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 2062 if (se_tmr->response)
e48354ce 2063 goto attach;
e48354ce
NB		 2064 break;
2065 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2066 case ISCSI_TM_FUNC_CLEAR_ACA:
2067 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2068 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2069 break;
2070 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2071 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2073 goto attach;
2074 }
2075 break;
2076 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2077 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2079 goto attach;
2080 }
2081 break;
2082 case ISCSI_TM_FUNC_TASK_REASSIGN:
2083 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2084 /*
2085 * Perform sanity checks on the ExpDataSN only if the
2086 * TASK_REASSIGN was successful.
2087 */
de103c93 2088 if (se_tmr->response)
e48354ce
NB		 2089 break;
2090
2091 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 2092 return iscsit_add_reject_cmd(cmd,
2093 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 2094 break;
2095 default:
2096 pr_err("Unknown TMR function: 0x%02x, protocol"
2097 " error.\n", function);
e48354ce
NB		 2098 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2099 goto attach;
2100 }
2101
2102 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2103 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2104 se_tmr->call_transport = 1;
2105attach:
2106 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2107 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2108 spin_unlock_bh(&conn->cmd_lock);
2109
2110 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 2111 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 2112 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2113 out_of_order_cmdsn = 1;
5a4c8666 2114 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2115 return 0;
5a4c8666 2116 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 2117 return -1;
e48354ce 2118 }
50e5c87d 2119 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 2120
5a4c8666 2121 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 2122 return 0;
2123 /*
2124 * Found the referenced task, send to transport for processing.
2125 */
2126 if (se_tmr->call_transport)
2127 return transport_generic_handle_tmr(&cmd->se_cmd);
2128
2129 /*
2130 * Could not find the referenced LUN, task, or Task Management
2131 * command not authorized or supported. Change state and
2132 * let the tx_thread send the response.
2133 *
2134 * For connection recovery, this is also the default action for
2135 * TMR TASK_REASSIGN.
2136 */
186a9647
NB		 2137 if (sess_ref) {
2138 pr_debug("Handle TMR, using sess_ref=true check\n");
afc16604 2139 target_put_sess_cmd(&cmd->se_cmd);
186a9647
NB		 2140 }
2141
e48354ce
NB		 2142 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2143 return 0;
2144}
3e1c81a9 2145EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 2146
2147/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 2148int
2149iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2150 struct iscsi_text *hdr)
e48354ce 2151{
64534aa7 2152 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 2153
21f5aa7e 2154 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 2155 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 2156 "greater than MaxXmitDataSegmentLength %u.\n",
2157 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 2158 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2159 (unsigned char *)hdr);
e48354ce
NB		 2160 }
2161
122f8afc
NB		 2162 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2163 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2164 pr_err("Multi sequence text commands currently not supported\n");
2165 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2166 (unsigned char *)hdr);
2167 }
2168
e48354ce
NB		 2169 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2170 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2171 hdr->exp_statsn, payload_length);
2172
64534aa7
NB		 2173 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2174 cmd->i_state = ISTATE_SEND_TEXTRSP;
2175 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2176 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2177 cmd->targ_xfer_tag = 0xFFFFFFFF;
2178 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2179 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2180 cmd->data_direction = DMA_NONE;
e4f4e801 2181 cmd->text_in_ptr = NULL;
64534aa7
NB		 2182
2183 return 0;
2184}
2185EXPORT_SYMBOL(iscsit_setup_text_cmd);
2186
2187int
2188iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2189 struct iscsi_text *hdr)
2190{
9864ca9d 2191 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2192 int cmdsn_ret;
2193
9864ca9d 2194 if (!text_in) {
e4f4e801
SG		 2195 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2196 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2197 pr_err("Unable to locate text_in buffer for sendtargets"
2198 " discovery\n");
2199 goto reject;
2200 }
2201 goto empty_sendtargets;
9864ca9d
NB		 2202 }
2203 if (strncmp("SendTargets", text_in, 11) != 0) {
2204 pr_err("Received Text Data that is not"
2205 " SendTargets, cannot continue.\n");
2206 goto reject;
2207 }
2208 text_ptr = strchr(text_in, '=');
2209 if (!text_ptr) {
2210 pr_err("No \"=\" separator found in Text Data,"
2211 " cannot continue.\n");
2212 goto reject;
2213 }
2214 if (!strncmp("=All", text_ptr, 4)) {
8060b8dd 2215 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
6665889c
NB		 2216 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2217 !strncmp("=eui.", text_ptr, 5)) {
8060b8dd 2218 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
9864ca9d
NB		 2219 } else {
2220 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2221 goto reject;
2222 }
2223
64534aa7
NB		 2224 spin_lock_bh(&conn->cmd_lock);
2225 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2226 spin_unlock_bh(&conn->cmd_lock);
2227
e4f4e801 2228empty_sendtargets:
64534aa7
NB		 2229 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2230
2231 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2233 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2235 return -1;
2236
64534aa7
NB		 2237 return 0;
2238 }
2239
2240 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2241
2242reject:
ba159914
NB		 2243 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2244 (unsigned char *)hdr);
64534aa7
NB		 2245}
2246EXPORT_SYMBOL(iscsit_process_text_cmd);
2247
2248static int
2249iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2250 unsigned char *buf)
2251{
2252 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2253 char *text_in = NULL;
2254 u32 payload_length = ntoh24(hdr->dlength);
2255 int rx_size, rc;
2256
2257 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2258 if (rc < 0)
561bf158 2259 return 0;
64534aa7
NB		 2260
2261 rx_size = payload_length;
2262 if (payload_length) {
64534aa7
NB		 2263 u32 checksum = 0, data_crc = 0;
2264 u32 padding = 0, pad_bytes = 0;
2265 int niov = 0, rx_got;
2266 struct kvec iov[3];
2267
2268 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2269 if (!text_in) {
2270 pr_err("Unable to allocate memory for"
2271 " incoming text parameters\n");
64534aa7 2272 goto reject;
e48354ce 2273 }
9864ca9d 2274 cmd->text_in_ptr = text_in;
e48354ce
NB		 2275
2276 memset(iov, 0, 3 * sizeof(struct kvec));
2277 iov[niov].iov_base = text_in;
64534aa7 2278 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2279
2280 padding = ((-payload_length) & 3);
2281 if (padding != 0) {
76f1928e 2282 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2283 iov[niov++].iov_len = padding;
2284 rx_size += padding;
2285 pr_debug("Receiving %u additional bytes"
2286 " for padding.\n", padding);
2287 }
2288 if (conn->conn_ops->DataDigest) {
2289 iov[niov].iov_base = &checksum;
2290 iov[niov++].iov_len = ISCSI_CRC_LEN;
2291 rx_size += ISCSI_CRC_LEN;
2292 }
2293
2294 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2295 if (rx_got != rx_size)
2296 goto reject;
e48354ce
NB		 2297
2298 if (conn->conn_ops->DataDigest) {
69110e3c 2299 iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
64534aa7 2300 text_in, payload_length,
76f1928e 2301 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2302 (u8 *)&data_crc);
2303
2304 if (checksum != data_crc) {
2305 pr_err("Text data CRC32C DataDigest"
2306 " 0x%08x does not match computed"
2307 " 0x%08x\n", checksum, data_crc);
2308 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2309 pr_err("Unable to recover from"
2310 " Text Data digest failure while in"
2311 " ERL=0.\n");
64534aa7 2312 goto reject;
e48354ce
NB		 2313 } else {
2314 /*
2315 * Silently drop this PDU and let the
2316 * initiator plug the CmdSN gap.
2317 */
2318 pr_debug("Dropping Text"
2319 " Command CmdSN: 0x%08x due to"
2320 " DataCRC error.\n", hdr->cmdsn);
2321 kfree(text_in);
2322 return 0;
2323 }
2324 } else {
2325 pr_debug("Got CRC32C DataDigest"
2326 " 0x%08x for %u bytes of text data.\n",
64534aa7 2327 checksum, payload_length);
e48354ce
NB		 2328 }
2329 }
64534aa7 2330 text_in[payload_length - 1] = '\0';
e48354ce 2331 pr_debug("Successfully read %d bytes of text"
64534aa7 2332 " data.\n", payload_length);
e48354ce
NB		 2333 }
2334
64534aa7 2335 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2336
64534aa7 2337reject:
9864ca9d
NB		 2338 kfree(cmd->text_in_ptr);
2339 cmd->text_in_ptr = NULL;
ba159914 2340 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 2341}
2342
2343int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2344{
2345 struct iscsi_conn *conn_p;
2346 struct iscsi_session *sess = conn->sess;
2347
2348 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2349 " for SID: %u.\n", conn->cid, conn->sess->sid);
2350
2351 atomic_set(&sess->session_logout, 1);
2352 atomic_set(&conn->conn_logout_remove, 1);
2353 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2354
2355 iscsit_inc_conn_usage_count(conn);
2356 iscsit_inc_session_usage_count(sess);
2357
2358 spin_lock_bh(&sess->conn_lock);
2359 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2360 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2361 continue;
2362
2363 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2364 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2365 }
2366 spin_unlock_bh(&sess->conn_lock);
2367
2368 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2369
2370 return 0;
2371}
2372
2373int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2374{
2375 struct iscsi_conn *l_conn;
2376 struct iscsi_session *sess = conn->sess;
2377
2378 pr_debug("Received logout request CLOSECONNECTION for CID:"
2379 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2380
2381 /*
2382 * A Logout Request with a CLOSECONNECTION reason code for a CID
2383 * can arrive on a connection with a differing CID.
2384 */
2385 if (conn->cid == cmd->logout_cid) {
2386 spin_lock_bh(&conn->state_lock);
2387 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2388 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2389
2390 atomic_set(&conn->conn_logout_remove, 1);
2391 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2392 iscsit_inc_conn_usage_count(conn);
2393
2394 spin_unlock_bh(&conn->state_lock);
2395 } else {
2396 /*
2397 * Handle all different cid CLOSECONNECTION requests in
2398 * iscsit_logout_post_handler_diffcid() as to give enough
2399 * time for any non immediate command's CmdSN to be
2400 * acknowledged on the connection in question.
2401 *
2402 * Here we simply make sure the CID is still around.
2403 */
2404 l_conn = iscsit_get_conn_from_cid(sess,
2405 cmd->logout_cid);
2406 if (!l_conn) {
2407 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2408 iscsit_add_cmd_to_response_queue(cmd, conn,
2409 cmd->i_state);
2410 return 0;
2411 }
2412
2413 iscsit_dec_conn_usage_count(l_conn);
2414 }
2415
2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2417
2418 return 0;
2419}
2420
2421int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2422{
2423 struct iscsi_session *sess = conn->sess;
2424
2425 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2426 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2427
2428 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2429 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2430 " while ERL!=2.\n");
2431 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433 return 0;
2434 }
2435
2436 if (conn->cid == cmd->logout_cid) {
2437 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2438 " with CID: %hu on CID: %hu, implementation error.\n",
2439 cmd->logout_cid, conn->cid);
2440 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2441 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2442 return 0;
2443 }
2444
2445 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2446
2447 return 0;
2448}
2449
3e1c81a9
NB		 2450int
2451iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2452 unsigned char *buf)
e48354ce
NB		 2453{
2454 int cmdsn_ret, logout_remove = 0;
2455 u8 reason_code = 0;
e48354ce
NB		 2456 struct iscsi_logout *hdr;
2457 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2458
2459 hdr = (struct iscsi_logout *) buf;
2460 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2461
2462 if (tiqn) {
2463 spin_lock(&tiqn->logout_stats.lock);
2464 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2465 tiqn->logout_stats.normal_logouts++;
2466 else
2467 tiqn->logout_stats.abnormal_logouts++;
2468 spin_unlock(&tiqn->logout_stats.lock);
2469 }
2470
2471 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2472 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2473 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2474 hdr->cid, conn->cid);
2475
2476 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2477 pr_err("Received logout request on connection that"
2478 " is not in logged in state, ignoring request.\n");
aafc9d15 2479 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2480 return 0;
2481 }
2482
e48354ce
NB		 2483 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2484 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2485 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2486 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2487 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2488 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2489 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2490 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2491 cmd->logout_reason = reason_code;
2492 cmd->data_direction = DMA_NONE;
2493
2494 /*
2495 * We need to sleep in these cases (by returning 1) until the Logout
2496 * Response gets sent in the tx thread.
2497 */
2498 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2499 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2500 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2501 logout_remove = 1;
2502
2503 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2504 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2505 spin_unlock_bh(&conn->cmd_lock);
2506
2507 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2508 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2509
2510 /*
2511 * Immediate commands are executed, well, immediately.
2512 * Non-Immediate Logout Commands are executed in CmdSN order.
2513 */
c6037cc5 2514 if (cmd->immediate_cmd) {
e48354ce
NB		 2515 int ret = iscsit_execute_cmd(cmd, 0);
2516
2517 if (ret < 0)
2518 return ret;
2519 } else {
561bf158 2520 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2521 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2522 logout_remove = 0;
ba159914
NB		 2523 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2524 return -1;
e48354ce
NB		 2525 }
2526
2527 return logout_remove;
2528}
3e1c81a9 2529EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce 2530
d2faaefb 2531int iscsit_handle_snack(
e48354ce
NB		 2532 struct iscsi_conn *conn,
2533 unsigned char *buf)
2534{
e48354ce
NB		 2535 struct iscsi_snack *hdr;
2536
2537 hdr = (struct iscsi_snack *) buf;
2538 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2539
2540 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2541 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2542 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2543 hdr->begrun, hdr->runlength, conn->cid);
2544
2545 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2546 pr_err("Initiator sent SNACK request while in"
2547 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2548 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2549 buf);
e48354ce
NB		 2550 }
2551 /*
2552 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2553 * call from inside iscsi_send_recovery_datain_or_r2t().
2554 */
2555 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2556 case 0:
2557 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2558 hdr->itt,
2559 be32_to_cpu(hdr->ttt),
2560 be32_to_cpu(hdr->begrun),
2561 be32_to_cpu(hdr->runlength));
e48354ce 2562 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2563 return iscsit_handle_status_snack(conn, hdr->itt,
2564 be32_to_cpu(hdr->ttt),
2565 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2566 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2567 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2568 be32_to_cpu(hdr->begrun),
2569 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2570 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2571 /* FIXME: Support R-Data SNACK */
2572 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2573 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2574 buf);
e48354ce
NB		 2575 default:
2576 pr_err("Unknown SNACK type 0x%02x, protocol"
2577 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2578 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2579 buf);
e48354ce
NB		 2580 }
2581
2582 return 0;
2583}
d2faaefb 2584EXPORT_SYMBOL(iscsit_handle_snack);
e48354ce
NB		 2585
2586static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2587{
2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2590 wait_for_completion_interruptible_timeout(
2591 &conn->rx_half_close_comp,
2592 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2593 }
2594}
2595
2596static int iscsit_handle_immediate_data(
2597 struct iscsi_cmd *cmd,
3e1c81a9 2598 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2599 u32 length)
2600{
2601 int iov_ret, rx_got = 0, rx_size = 0;
2602 u32 checksum, iov_count = 0, padding = 0;
2603 struct iscsi_conn *conn = cmd->conn;
2604 struct kvec *iov;
2605
2606 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2607 if (iov_ret < 0)
2608 return IMMEDIATE_DATA_CANNOT_RECOVER;
2609
2610 rx_size = length;
2611 iov_count = iov_ret;
2612 iov = &cmd->iov_data[0];
2613
2614 padding = ((-length) & 3);
2615 if (padding != 0) {
2616 iov[iov_count].iov_base = cmd->pad_bytes;
2617 iov[iov_count++].iov_len = padding;
2618 rx_size += padding;
2619 }
2620
2621 if (conn->conn_ops->DataDigest) {
2622 iov[iov_count].iov_base = &checksum;
2623 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2624 rx_size += ISCSI_CRC_LEN;
2625 }
2626
2627 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2628
2629 iscsit_unmap_iovec(cmd);
2630
2631 if (rx_got != rx_size) {
2632 iscsit_rx_thread_wait_for_tcp(conn);
2633 return IMMEDIATE_DATA_CANNOT_RECOVER;
2634 }
2635
2636 if (conn->conn_ops->DataDigest) {
2637 u32 data_crc;
2638
69110e3c 2639 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
e48354ce
NB		 2640 cmd->write_data_done, length, padding,
2641 cmd->pad_bytes);
2642
2643 if (checksum != data_crc) {
2644 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2645 " does not match computed 0x%08x\n", checksum,
2646 data_crc);
2647
2648 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2649 pr_err("Unable to recover from"
2650 " Immediate Data digest failure while"
2651 " in ERL=0.\n");
ba159914 2652 iscsit_reject_cmd(cmd,
e48354ce 2653 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2654 (unsigned char *)hdr);
e48354ce
NB		 2655 return IMMEDIATE_DATA_CANNOT_RECOVER;
2656 } else {
ba159914 2657 iscsit_reject_cmd(cmd,
e48354ce 2658 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2659 (unsigned char *)hdr);
e48354ce
NB		 2660 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2661 }
2662 } else {
2663 pr_debug("Got CRC32C DataDigest 0x%08x for"
2664 " %u bytes of Immediate Data\n", checksum,
2665 length);
2666 }
2667 }
2668
2669 cmd->write_data_done += length;
2670
ebf1d95c 2671 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2672 spin_lock_bh(&cmd->istate_lock);
2673 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2674 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2675 spin_unlock_bh(&cmd->istate_lock);
2676 }
2677
2678 return IMMEDIATE_DATA_NORMAL_OPERATION;
2679}
2680
2681/*
2682 * Called with sess->conn_lock held.
2683 */
2684/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2685 with active network interface */
2686static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2687{
2688 struct iscsi_cmd *cmd;
2689 struct iscsi_conn *conn_p;
d444edc6 2690 bool found = false;
e48354ce
NB		 2691
2692 /*
2693 * Only send a Asynchronous Message on connections whos network
2694 * interface is still functional.
2695 */
2696 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2697 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2698 iscsit_inc_conn_usage_count(conn_p);
d444edc6 2699 found = true;
e48354ce
NB		 2700 break;
2701 }
2702 }
2703
d444edc6 2704 if (!found)
e48354ce
NB		 2705 return;
2706
676687c6 2707 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2708 if (!cmd) {
2709 iscsit_dec_conn_usage_count(conn_p);
2710 return;
2711 }
2712
2713 cmd->logout_cid = conn->cid;
2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2715 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2716
2717 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2718 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2719 spin_unlock_bh(&conn_p->cmd_lock);
2720
2721 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2722 iscsit_dec_conn_usage_count(conn_p);
2723}
2724
2725static int iscsit_send_conn_drop_async_message(
2726 struct iscsi_cmd *cmd,
2727 struct iscsi_conn *conn)
2728{
2729 struct iscsi_async *hdr;
2730
e48354ce
NB		 2731 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2732
2733 hdr = (struct iscsi_async *) cmd->pdu;
2734 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2735 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2736 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2737 cmd->targ_xfer_tag = 0xFFFFFFFF;
2738 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2739 cmd->stat_sn = conn->stat_sn++;
2740 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2741 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2742 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 2743 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2744 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2745 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2746 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2747
e48354ce
NB		 2748 pr_debug("Sending Connection Dropped Async Message StatSN:"
2749 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2750 cmd->logout_cid, conn->cid);
2854bb23
VP		 2751
2752 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2753}
2754
6f3c0e69
AG		 2755static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2756{
2757 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2758 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2759 wait_for_completion_interruptible_timeout(
2760 &conn->tx_half_close_comp,
2761 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2762 }
2763}
2764
d2faaefb 2765void
2ec5a8c1
NB		 2766iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2767 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2768 bool set_statsn)
e48354ce 2769{
2ec5a8c1
NB		 2770 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2771 hdr->flags = datain->flags;
2772 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2773 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2774 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2775 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2776 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2777 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2778 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2779 }
2780 }
2781 hton24(hdr->dlength, datain->length);
2782 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2783 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2784 (struct scsi_lun *)&hdr->lun);
2785 else
2786 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2787
2788 hdr->itt = cmd->init_task_tag;
2789
2790 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2791 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2792 else
2793 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2794 if (set_statsn)
2795 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2796 else
2797 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2798
2799 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2800 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2801 hdr->datasn = cpu_to_be32(datain->data_sn);
2802 hdr->offset = cpu_to_be32(datain->offset);
2803
2804 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2805 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2806 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2807 ntohl(hdr->offset), datain->length, conn->cid);
2808}
d2faaefb 2809EXPORT_SYMBOL(iscsit_build_datain_pdu);
2ec5a8c1
NB		 2810
2811static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2812{
2813 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2814 struct iscsi_datain datain;
2815 struct iscsi_datain_req *dr;
2854bb23 2816 int eodr = 0, ret;
2ec5a8c1 2817 bool set_statsn = false;
e48354ce
NB		 2818
2819 memset(&datain, 0, sizeof(struct iscsi_datain));
2820 dr = iscsit_get_datain_values(cmd, &datain);
2821 if (!dr) {
2822 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2823 cmd->init_task_tag);
2824 return -1;
2825 }
e48354ce
NB		 2826 /*
2827 * Be paranoid and double check the logic for now.
2828 */
ebf1d95c 2829 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2830 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2831 " datain.length: %u exceeds cmd->data_length: %u\n",
2832 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2833 cmd->se_cmd.data_length);
e48354ce
NB		 2834 return -1;
2835 }
2836
04f3b31b 2837 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2838 /*
2839 * Special case for successfully execution w/ both DATAIN
2840 * and Sense Data.
2841 */
2842 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2843 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2844 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2845 else {
2846 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2847 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2848 iscsit_increment_maxcmdsn(cmd, conn->sess);
2849 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2850 set_statsn = true;
e48354ce 2851 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2852 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2853 set_statsn = true;
e48354ce
NB		 2854 }
2855
2ec5a8c1 2856 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce 2857
2854bb23
VP		 2858 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2859 if (ret < 0)
6f3c0e69 2860 return ret;
6f3c0e69 2861
e48354ce 2862 if (dr->dr_complete) {
6f3c0e69 2863 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2864 2 : 1;
2865 iscsit_free_datain_req(cmd, dr);
2866 }
2867
6f3c0e69 2868 return eodr;
e48354ce
NB		 2869}
2870
2ec5a8c1
NB		 2871int
2872iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2873 struct iscsi_logout_rsp *hdr)
e48354ce 2874{
e48354ce
NB		 2875 struct iscsi_conn *logout_conn = NULL;
2876 struct iscsi_conn_recovery *cr = NULL;
2877 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2878 /*
2879 * The actual shutting down of Sessions and/or Connections
2880 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2881 * is done in scsi_logout_post_handler().
2882 */
2883 switch (cmd->logout_reason) {
2884 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2885 pr_debug("iSCSI session logout successful, setting"
2886 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2888 break;
2889 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2890 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2891 break;
2892 /*
2893 * For CLOSECONNECTION logout requests carrying
2894 * a matching logout CID -> local CID, the reference
2895 * for the local CID will have been incremented in
2896 * iscsi_logout_closeconnection().
2897 *
2898 * For CLOSECONNECTION logout requests carrying
2899 * a different CID than the connection it arrived
2900 * on, the connection responding to cmd->logout_cid
2901 * is stopped in iscsit_logout_post_handler_diffcid().
2902 */
2903
2904 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2905 " successful.\n", cmd->logout_cid, conn->cid);
2906 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2907 break;
2908 case ISCSI_LOGOUT_REASON_RECOVERY:
2909 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2910 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2911 break;
2912 /*
2913 * If the connection is still active from our point of view
2914 * force connection recovery to occur.
2915 */
2916 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2917 cmd->logout_cid);
ee1b1b9c 2918 if (logout_conn) {
e48354ce
NB		 2919 iscsit_connection_reinstatement_rcfr(logout_conn);
2920 iscsit_dec_conn_usage_count(logout_conn);
2921 }
2922
2923 cr = iscsit_get_inactive_connection_recovery_entry(
2924 conn->sess, cmd->logout_cid);
2925 if (!cr) {
2926 pr_err("Unable to locate CID: %hu for"
2927 " REMOVECONNFORRECOVERY Logout Request.\n",
2928 cmd->logout_cid);
2929 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2930 break;
2931 }
2932
2933 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2934
2935 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2936 " for recovery for CID: %hu on CID: %hu successful.\n",
2937 cmd->logout_cid, conn->cid);
2938 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2939 break;
2940 default:
2941 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2942 cmd->logout_reason);
2943 return -1;
2944 }
2945
e48354ce
NB		 2946 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2947 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2948 hdr->response = cmd->logout_response;
66c7db68 2949 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2950 cmd->stat_sn = conn->stat_sn++;
2951 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2952
2953 iscsit_increment_maxcmdsn(cmd, conn->sess);
2954 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2955 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 2956
2ec5a8c1
NB		 2957 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2958 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2959 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2960 cmd->logout_cid, conn->cid);
2961
2962 return 0;
2963}
2964EXPORT_SYMBOL(iscsit_build_logout_rsp);
2965
2966static int
2967iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2968{
2854bb23 2969 int rc;
2ec5a8c1
NB		 2970
2971 rc = iscsit_build_logout_rsp(cmd, conn,
2972 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2973 if (rc < 0)
2974 return rc;
2975
2854bb23 2976 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2977}
2978
2ec5a8c1
NB		 2979void
2980iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2981 struct iscsi_nopin *hdr, bool nopout_response)
2982{
2983 hdr->opcode = ISCSI_OP_NOOP_IN;
2984 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2985 hton24(hdr->dlength, cmd->buf_ptr_size);
2986 if (nopout_response)
2987 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2988 hdr->itt = cmd->init_task_tag;
2989 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2990 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2991 conn->stat_sn;
2992 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2993
2994 if (nopout_response)
2995 iscsit_increment_maxcmdsn(cmd, conn->sess);
2996
2997 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2998 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2999
3000 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3001 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3fc6a642 3002 "Solicited" : "Unsolicited", cmd->init_task_tag,
2ec5a8c1
NB		 3003 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3004}
3005EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3006
e48354ce
NB		 3007/*
3008 * Unsolicited NOPIN, either requesting a response or not.
3009 */
3010static int iscsit_send_unsolicited_nopin(
3011 struct iscsi_cmd *cmd,
3012 struct iscsi_conn *conn,
3013 int want_response)
3014{
2ec5a8c1 3015 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2854bb23 3016 int ret;
e48354ce 3017
2ec5a8c1 3018 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce 3019
e48354ce
NB		 3020 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3021 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3022
2854bb23
VP		 3023 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3024 if (ret < 0)
6f3c0e69 3025 return ret;
6f3c0e69
AG		 3026
3027 spin_lock_bh(&cmd->istate_lock);
3028 cmd->i_state = want_response ?
3029 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3030 spin_unlock_bh(&cmd->istate_lock);
3031
e48354ce
NB		 3032 return 0;
3033}
3034
2ec5a8c1
NB		 3035static int
3036iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 3037{
2ec5a8c1 3038 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 3039
2ec5a8c1 3040 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 3041
e48354ce
NB		 3042 /*
3043 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3044 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3045 */
2854bb23 3046 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
e48354ce 3047
2854bb23
VP		 3048 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3049 cmd->buf_ptr,
3050 cmd->buf_ptr_size);
e48354ce
NB		 3051}
3052
6f3c0e69 3053static int iscsit_send_r2t(
e48354ce
NB		 3054 struct iscsi_cmd *cmd,
3055 struct iscsi_conn *conn)
3056{
e48354ce
NB		 3057 struct iscsi_r2t *r2t;
3058 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3059 int ret;
e48354ce
NB		 3060
3061 r2t = iscsit_get_r2t_from_list(cmd);
3062 if (!r2t)
3063 return -1;
3064
3065 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3066 memset(hdr, 0, ISCSI_HDR_LEN);
3067 hdr->opcode = ISCSI_OP_R2T;
3068 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3069 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3070 (struct scsi_lun *)&hdr->lun);
66c7db68 3071 hdr->itt = cmd->init_task_tag;
8567270d
VP		 3072 if (conn->conn_transport->iscsit_get_r2t_ttt)
3073 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3074 else
3075 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
e48354ce
NB		 3076 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3077 hdr->statsn = cpu_to_be32(conn->stat_sn);
3078 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3079 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 3080 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3081 hdr->data_offset = cpu_to_be32(r2t->offset);
3082 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3083
e48354ce
NB		 3084 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3085 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3086 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3087 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3088 r2t->offset, r2t->xfer_len, conn->cid);
3089
e48354ce
NB		 3090 spin_lock_bh(&cmd->r2t_lock);
3091 r2t->sent_r2t = 1;
3092 spin_unlock_bh(&cmd->r2t_lock);
3093
2854bb23 3094 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
6f3c0e69 3095 if (ret < 0) {
6f3c0e69
AG		 3096 return ret;
3097 }
3098
3099 spin_lock_bh(&cmd->dataout_timeout_lock);
3100 iscsit_start_dataout_timer(cmd, conn);
3101 spin_unlock_bh(&cmd->dataout_timeout_lock);
3102
e48354ce
NB		 3103 return 0;
3104}
3105
3106/*
8b1e1244
AG		 3107 * @recovery: If called from iscsi_task_reassign_complete_write() for
3108 * connection recovery.
e48354ce
NB		 3109 */
3110int iscsit_build_r2ts_for_cmd(
e48354ce 3111 struct iscsi_conn *conn,
3e1c81a9 3112 struct iscsi_cmd *cmd,
8b1e1244 3113 bool recovery)
e48354ce
NB		 3114{
3115 int first_r2t = 1;
3116 u32 offset = 0, xfer_len = 0;
3117
3118 spin_lock_bh(&cmd->r2t_lock);
3119 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3120 spin_unlock_bh(&cmd->r2t_lock);
3121 return 0;
3122 }
3123
8b1e1244
AG		 3124 if (conn->sess->sess_ops->DataSequenceInOrder &&
3125 !recovery)
c6037cc5 3126 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3127
3128 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3129 if (conn->sess->sess_ops->DataSequenceInOrder) {
3130 offset = cmd->r2t_offset;
3131
8b1e1244
AG		 3132 if (first_r2t && recovery) {
3133 int new_data_end = offset +
3134 conn->sess->sess_ops->MaxBurstLength -
3135 cmd->next_burst_len;
3136
ebf1d95c
AG		 3137 if (new_data_end > cmd->se_cmd.data_length)
3138 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3139 else
3140 xfer_len =
3141 conn->sess->sess_ops->MaxBurstLength -
3142 cmd->next_burst_len;
e48354ce 3143 } else {
8b1e1244
AG		 3144 int new_data_end = offset +
3145 conn->sess->sess_ops->MaxBurstLength;
3146
ebf1d95c
AG		 3147 if (new_data_end > cmd->se_cmd.data_length)
3148 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3149 else
3150 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3151 }
3152 cmd->r2t_offset += xfer_len;
3153
ebf1d95c 3154 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3155 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3156 } else {
3157 struct iscsi_seq *seq;
3158
3159 seq = iscsit_get_seq_holder_for_r2t(cmd);
3160 if (!seq) {
3161 spin_unlock_bh(&cmd->r2t_lock);
3162 return -1;
3163 }
3164
3165 offset = seq->offset;
3166 xfer_len = seq->xfer_len;
3167
3168 if (cmd->seq_send_order == cmd->seq_count)
3169 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3170 }
3171 cmd->outstanding_r2ts++;
3172 first_r2t = 0;
3173
3174 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3175 spin_unlock_bh(&cmd->r2t_lock);
3176 return -1;
3177 }
3178
3179 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3180 break;
3181 }
3182 spin_unlock_bh(&cmd->r2t_lock);
3183
3184 return 0;
3185}
d2faaefb 3186EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
e48354ce 3187
2ec5a8c1
NB		 3188void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3189 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3190{
2ec5a8c1 3191 if (inc_stat_sn)
e48354ce
NB		 3192 cmd->stat_sn = conn->stat_sn++;
3193
04f3b31b 3194 atomic_long_inc(&conn->sess->rsp_pdus);
e48354ce 3195
e48354ce
NB		 3196 memset(hdr, 0, ISCSI_HDR_LEN);
3197 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3198 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3199 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3200 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3202 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3203 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3204 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3205 }
3206 hdr->response = cmd->iscsi_response;
3207 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3208 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3209 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3210
3211 iscsit_increment_maxcmdsn(cmd, conn->sess);
3212 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3213 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3214
2ec5a8c1
NB		 3215 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3216 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3217 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3218 cmd->se_cmd.scsi_status, conn->cid);
3219}
3220EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3221
3222static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3223{
3224 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
2ec5a8c1 3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
2854bb23
VP		 3226 void *data_buf = NULL;
3227 u32 padding = 0, data_buf_len = 0;
2ec5a8c1
NB		 3228
3229 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3230
e48354ce
NB		 3231 /*
3232 * Attach SENSE DATA payload to iSCSI Response PDU
3233 */
3234 if (cmd->se_cmd.sense_buffer &&
3235 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3236 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3237 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3238 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3239
e48354ce 3240 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3241 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2854bb23
VP		 3242 data_buf = cmd->sense_buffer;
3243 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
e48354ce
NB		 3244
3245 if (padding) {
9c58b7dd 3246 memset(cmd->sense_buffer +
e48354ce 3247 cmd->se_cmd.scsi_sense_length, 0, padding);
e48354ce
NB		 3248 pr_debug("Adding %u bytes of padding to"
3249 " SENSE.\n", padding);
3250 }
3251
e48354ce
NB		 3252 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3253 " Response PDU\n",
3254 cmd->se_cmd.scsi_sense_length);
3255 }
3256
2854bb23
VP		 3257 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3258 data_buf_len);
e48354ce
NB		 3259}
3260
3261static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3262{
3263 switch (se_tmr->response) {
3264 case TMR_FUNCTION_COMPLETE:
3265 return ISCSI_TMF_RSP_COMPLETE;
3266 case TMR_TASK_DOES_NOT_EXIST:
3267 return ISCSI_TMF_RSP_NO_TASK;
3268 case TMR_LUN_DOES_NOT_EXIST:
3269 return ISCSI_TMF_RSP_NO_LUN;
3270 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3271 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3272 case TMR_FUNCTION_REJECTED:
3273 default:
3274 return ISCSI_TMF_RSP_REJECTED;
3275 }
3276}
3277
2ec5a8c1
NB		 3278void
3279iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3280 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3281{
3282 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3283
e48354ce 3284 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3285 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3286 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3287 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3288 cmd->stat_sn = conn->stat_sn++;
3289 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3290
3291 iscsit_increment_maxcmdsn(cmd, conn->sess);
3292 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3293 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3294
2ec5a8c1
NB		 3295 pr_debug("Built Task Management Response ITT: 0x%08x,"
3296 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3297 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3298}
3299EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3300
3301static int
3302iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3303{
3304 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
2ec5a8c1
NB		 3305
3306 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3307
2854bb23 3308 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 3309}
3310
2f9bc894
NB		 3311static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3312{
3313 bool ret = false;
3314
3315 if (np->np_sockaddr.ss_family == AF_INET6) {
3316 const struct sockaddr_in6 sin6 = {
3317 .sin6_addr = IN6ADDR_ANY_INIT };
3318 struct sockaddr_in6 *sock_in6 =
3319 (struct sockaddr_in6 *)&np->np_sockaddr;
3320
3321 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3322 sin6.sin6_addr.s6_addr, 16))
3323 ret = true;
3324 } else {
3325 struct sockaddr_in * sock_in =
3326 (struct sockaddr_in *)&np->np_sockaddr;
3327
cea0b4ce 3328 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3329 ret = true;
3330 }
3331
3332 return ret;
3333}
3334
8b1e1244
AG		 3335#define SENDTARGETS_BUF_LIMIT 32768U
3336
22c7aaa5
SG		 3337static int
3338iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
e4f4e801
SG		 3339 enum iscsit_transport_type network_transport,
3340 int skip_bytes, bool *completed)
e48354ce
NB		 3341{
3342 char *payload = NULL;
3343 struct iscsi_conn *conn = cmd->conn;
3344 struct iscsi_portal_group *tpg;
3345 struct iscsi_tiqn *tiqn;
3346 struct iscsi_tpg_np *tpg_np;
3347 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3348 int target_name_printed;
8b1e1244 3349 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3350 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
a6415cdd 3351 bool active;
e48354ce 3352
be7dcfb6 3353 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
8b1e1244 3354 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3355
3356 payload = kzalloc(buffer_len, GFP_KERNEL);
3357 if (!payload) {
3358 pr_err("Unable to allocate memory for sendtargets"
3359 " response.\n");
3360 return -ENOMEM;
3361 }
6665889c 3362 /*
8060b8dd 3363 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
6665889c
NB		 3364 * explicit case..
3365 */
8060b8dd 3366 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
6665889c
NB		 3367 text_ptr = strchr(text_in, '=');
3368 if (!text_ptr) {
3369 pr_err("Unable to locate '=' string in text_in:"
3370 " %s\n", text_in);
4f45d320 3371 kfree(payload);
6665889c
NB		 3372 return -EINVAL;
3373 }
3374 /*
3375 * Skip over '=' character..
3376 */
3377 text_ptr += 1;
3378 }
e48354ce
NB		 3379
3380 spin_lock(&tiqn_lock);
3381 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
8060b8dd 3382 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
6665889c
NB		 3383 strcmp(tiqn->tiqn, text_ptr)) {
3384 continue;
3385 }
3386
2dd1d53f 3387 target_name_printed = 0;
e48354ce
NB		 3388
3389 spin_lock(&tiqn->tiqn_tpg_lock);
3390 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3391
2dd1d53f
TG		 3392 /* If demo_mode_discovery=0 and generate_node_acls=0
3393 * (demo mode dislabed) do not return
3394 * TargetName+TargetAddress unless a NodeACL exists.
3395 */
3396
3397 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3398 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
21aaa23b 3399 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
2dd1d53f
TG		 3400 cmd->conn->sess->sess_ops->InitiatorName))) {
3401 continue;
3402 }
3403
e48354ce 3404 spin_lock(&tpg->tpg_state_lock);
a6415cdd 3405 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
e48354ce
NB		 3406 spin_unlock(&tpg->tpg_state_lock);
3407
a6415cdd
DD		 3408 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3409 continue;
3410
e48354ce
NB		 3411 spin_lock(&tpg->tpg_np_lock);
3412 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3413 tpg_np_list) {
2f9bc894
NB		 3414 struct iscsi_np *np = tpg_np->tpg_np;
3415 bool inaddr_any = iscsit_check_inaddr_any(np);
13a3cf08 3416 struct sockaddr_storage *sockaddr;
2f9bc894 3417
22c7aaa5
SG		 3418 if (np->np_network_transport != network_transport)
3419 continue;
3420
2dd1d53f
TG		 3421 if (!target_name_printed) {
3422 len = sprintf(buf, "TargetName=%s",
3423 tiqn->tiqn);
3424 len += 1;
3425
3426 if ((len + payload_len) > buffer_len) {
3427 spin_unlock(&tpg->tpg_np_lock);
3428 spin_unlock(&tiqn->tiqn_tpg_lock);
3429 end_of_buf = 1;
3430 goto eob;
3431 }
e4f4e801
SG		 3432
3433 if (skip_bytes && len <= skip_bytes) {
3434 skip_bytes -= len;
3435 } else {
3436 memcpy(payload + payload_len, buf, len);
3437 payload_len += len;
3438 target_name_printed = 1;
3439 if (len > skip_bytes)
3440 skip_bytes = 0;
3441 }
2dd1d53f
TG		 3442 }
3443
69d75574
AG		 3444 if (inaddr_any)
3445 sockaddr = &conn->local_sockaddr;
1997e625 3446 else
69d75574 3447 sockaddr = &np->np_sockaddr;
1997e625 3448
69d75574
AG		 3449 len = sprintf(buf, "TargetAddress="
3450 "%pISpc,%hu",
3451 sockaddr,
3452 tpg->tpgt);
e48354ce
NB		 3453 len += 1;
3454
3455 if ((len + payload_len) > buffer_len) {
3456 spin_unlock(&tpg->tpg_np_lock);
3457 spin_unlock(&tiqn->tiqn_tpg_lock);
3458 end_of_buf = 1;
3459 goto eob;
3460 }
e4f4e801
SG		 3461
3462 if (skip_bytes && len <= skip_bytes) {
3463 skip_bytes -= len;
3464 } else {
3465 memcpy(payload + payload_len, buf, len);
3466 payload_len += len;
3467 if (len > skip_bytes)
3468 skip_bytes = 0;
3469 }
e48354ce
NB		 3470 }
3471 spin_unlock(&tpg->tpg_np_lock);
3472 }
3473 spin_unlock(&tiqn->tiqn_tpg_lock);
3474eob:
e4f4e801
SG		 3475 if (end_of_buf) {
3476 *completed = false;
e48354ce 3477 break;
e4f4e801 3478 }
6665889c 3479
8060b8dd 3480 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
6665889c 3481 break;
e48354ce
NB		 3482 }
3483 spin_unlock(&tiqn_lock);
3484
3485 cmd->buf_ptr = payload;
3486
3487 return payload_len;
3488}
3489
889c8a68
NB		 3490int
3491iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
22c7aaa5
SG		 3492 struct iscsi_text_rsp *hdr,
3493 enum iscsit_transport_type network_transport)
e48354ce 3494{
889c8a68 3495 int text_length, padding;
e4f4e801 3496 bool completed = true;
e48354ce 3497
e4f4e801
SG		 3498 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3499 cmd->read_data_done,
3500 &completed);
e48354ce
NB		 3501 if (text_length < 0)
3502 return text_length;
3503
e4f4e801
SG		 3504 if (completed) {
3505 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3506 } else {
3507 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3508 cmd->read_data_done += text_length;
3509 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3510 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3511 }
889c8a68 3512 hdr->opcode = ISCSI_OP_TEXT_RSP;
e48354ce 3513 padding = ((-text_length) & 3);
e48354ce 3514 hton24(hdr->dlength, text_length);
889c8a68
NB		 3515 hdr->itt = cmd->init_task_tag;
3516 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3517 cmd->stat_sn = conn->stat_sn++;
3518 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3519
3520 iscsit_increment_maxcmdsn(cmd, conn->sess);
e4f4e801
SG		 3521 /*
3522 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3523 * correctly increment MaxCmdSN for each response answering a
3524 * non immediate text request with a valid CmdSN.
3525 */
3526 cmd->maxcmdsn_inc = 0;
889c8a68 3527 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3528 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3529
e4f4e801
SG		 3530 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3531 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3532 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3533 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3534 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
889c8a68
NB		 3535
3536 return text_length + padding;
3537}
3538EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3539
889c8a68
NB		 3540static int iscsit_send_text_rsp(
3541 struct iscsi_cmd *cmd,
3542 struct iscsi_conn *conn)
3543{
3544 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
2854bb23 3545 int text_length;
e48354ce 3546
864e504a
VP		 3547 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3548 conn->conn_transport->transport_type);
2854bb23
VP		 3549 if (text_length < 0)
3550 return text_length;
e48354ce 3551
2854bb23
VP		 3552 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3553 cmd->buf_ptr,
3554 text_length);
e48354ce
NB		 3555}
3556
2ec5a8c1
NB		 3557void
3558iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3559 struct iscsi_reject *hdr)
3560{
3561 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3562 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3563 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3564 hton24(hdr->dlength, ISCSI_HDR_LEN);
3565 hdr->ffffffff = cpu_to_be32(0xffffffff);
3566 cmd->stat_sn = conn->stat_sn++;
3567 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3568 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3569 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 3570
3571}
3572EXPORT_SYMBOL(iscsit_build_reject);
3573
e48354ce
NB		 3574static int iscsit_send_reject(
3575 struct iscsi_cmd *cmd,
3576 struct iscsi_conn *conn)
3577{
bfbdb31d 3578 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3579
bfbdb31d 3580 iscsit_build_reject(cmd, conn, hdr);
e48354ce 3581
e48354ce
NB		 3582 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3583 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3584
2854bb23
VP		 3585 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3586 cmd->buf_ptr,
3587 ISCSI_HDR_LEN);
e48354ce
NB		 3588}
3589
e48354ce
NB		 3590void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3591{
e48354ce
NB		 3592 int ord, cpu;
3593 /*
88dcd2da
NB		 3594 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3595 * within iscsit_start_kthreads()
e48354ce 3596 *
88dcd2da
NB		 3597 * Here we use bitmap_id to determine which CPU that this
3598 * iSCSI connection's RX/TX threads will be scheduled to
e48354ce
NB		 3599 * execute upon.
3600 */
88dcd2da 3601 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3602 for_each_online_cpu(cpu) {
3603 if (ord-- == 0) {
3604 cpumask_set_cpu(cpu, conn->conn_cpumask);
3605 return;
3606 }
3607 }
3608 /*
3609 * This should never be reached..
3610 */
3611 dump_stack();
3612 cpumask_setall(conn->conn_cpumask);
3613}
3614
d2faaefb 3615int
2ec5a8c1 3616iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3617{
6f3c0e69
AG		 3618 int ret;
3619
2ec5a8c1
NB		 3620 switch (state) {
3621 case ISTATE_SEND_R2T:
3622 ret = iscsit_send_r2t(cmd, conn);
3623 if (ret < 0)
3624 goto err;
3625 break;
3626 case ISTATE_REMOVE:
3627 spin_lock_bh(&conn->cmd_lock);
5159d763 3628 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3629 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3630
aafc9d15 3631 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3632 break;
3633 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3634 iscsit_mod_nopin_response_timer(conn);
3635 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3636 if (ret < 0)
6f3c0e69 3637 goto err;
2ec5a8c1
NB		 3638 break;
3639 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3640 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3641 if (ret < 0)
3642 goto err;
3643 break;
3644 default:
3645 pr_err("Unknown Opcode: 0x%02x ITT:"
3646 " 0x%08x, i_state: %d on CID: %hu\n",
3647 cmd->iscsi_opcode, cmd->init_task_tag, state,
3648 conn->cid);
3649 goto err;
6f3c0e69
AG		 3650 }
3651
3652 return 0;
3653
3654err:
3655 return -1;
3656}
d2faaefb 3657EXPORT_SYMBOL(iscsit_immediate_queue);
6f3c0e69 3658
2ec5a8c1
NB		 3659static int
3660iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3661{
2ec5a8c1 3662 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3663 struct iscsi_queue_req *qr;
3664 struct iscsi_cmd *cmd;
3665 u8 state;
3666 int ret;
3667
2ec5a8c1
NB		 3668 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3669 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3670 cmd = qr->cmd;
3671 state = qr->state;
3672 kmem_cache_free(lio_qr_cache, qr);
3673
2ec5a8c1
NB		 3674 ret = t->iscsit_immediate_queue(conn, cmd, state);
3675 if (ret < 0)
3676 return ret;
3677 }
fd3a9025 3678
2ec5a8c1
NB		 3679 return 0;
3680}
6f3c0e69 3681
d2faaefb 3682int
2ec5a8c1
NB		 3683iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3684{
3685 int ret;
3686
3687check_rsp_state:
3688 switch (state) {
3689 case ISTATE_SEND_DATAIN:
3690 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3691 if (ret < 0)
3692 goto err;
2ec5a8c1
NB		 3693 else if (!ret)
3694 /* more drs */
3695 goto check_rsp_state;
3696 else if (ret == 1) {
3697 /* all done */
3698 spin_lock_bh(&cmd->istate_lock);
3699 cmd->i_state = ISTATE_SENT_STATUS;
3700 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3701
2ec5a8c1
NB		 3702 if (atomic_read(&conn->check_immediate_queue))
3703 return 1;
6f3c0e69 3704
2ec5a8c1
NB		 3705 return 0;
3706 } else if (ret == 2) {
3707 /* Still must send status,
3708 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3709 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3710 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3711 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3712 state = ISTATE_SEND_STATUS;
3713 goto check_rsp_state;
3714 }
3715
3716 break;
3717 case ISTATE_SEND_STATUS:
3718 case ISTATE_SEND_STATUS_RECOVERY:
3719 ret = iscsit_send_response(cmd, conn);
3720 break;
3721 case ISTATE_SEND_LOGOUTRSP:
3722 ret = iscsit_send_logout(cmd, conn);
3723 break;
3724 case ISTATE_SEND_ASYNCMSG:
3725 ret = iscsit_send_conn_drop_async_message(
3726 cmd, conn);
3727 break;
3728 case ISTATE_SEND_NOPIN:
3729 ret = iscsit_send_nopin(cmd, conn);
3730 break;
3731 case ISTATE_SEND_REJECT:
3732 ret = iscsit_send_reject(cmd, conn);
3733 break;
3734 case ISTATE_SEND_TASKMGTRSP:
3735 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3736 if (ret != 0)
6f3c0e69 3737 break;
2ec5a8c1
NB		 3738 ret = iscsit_tmr_post_handler(cmd, conn);
3739 if (ret != 0)
3740 iscsit_fall_back_to_erl0(conn->sess);
3741 break;
3742 case ISTATE_SEND_TEXTRSP:
3743 ret = iscsit_send_text_rsp(cmd, conn);
3744 break;
3745 default:
3746 pr_err("Unknown Opcode: 0x%02x ITT:"
3747 " 0x%08x, i_state: %d on CID: %hu\n",
3748 cmd->iscsi_opcode, cmd->init_task_tag,
3749 state, conn->cid);
3750 goto err;
3751 }
3752 if (ret < 0)
3753 goto err;
3754
2ec5a8c1
NB		 3755 switch (state) {
3756 case ISTATE_SEND_LOGOUTRSP:
3757 if (!iscsit_logout_post_handler(cmd, conn))
88dcd2da 3758 return -ECONNRESET;
2ec5a8c1
NB		 3759 /* fall through */
3760 case ISTATE_SEND_STATUS:
3761 case ISTATE_SEND_ASYNCMSG:
3762 case ISTATE_SEND_NOPIN:
3763 case ISTATE_SEND_STATUS_RECOVERY:
3764 case ISTATE_SEND_TEXTRSP:
3765 case ISTATE_SEND_TASKMGTRSP:
ba159914 3766 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3767 spin_lock_bh(&cmd->istate_lock);
3768 cmd->i_state = ISTATE_SENT_STATUS;
3769 spin_unlock_bh(&cmd->istate_lock);
3770 break;
2ec5a8c1
NB		 3771 default:
3772 pr_err("Unknown Opcode: 0x%02x ITT:"
3773 " 0x%08x, i_state: %d on CID: %hu\n",
3774 cmd->iscsi_opcode, cmd->init_task_tag,
3775 cmd->i_state, conn->cid);
3776 goto err;
6f3c0e69
AG		 3777 }
3778
2ec5a8c1
NB		 3779 if (atomic_read(&conn->check_immediate_queue))
3780 return 1;
3781
6f3c0e69
AG		 3782 return 0;
3783
3784err:
3785 return -1;
6f3c0e69 3786}
d2faaefb 3787EXPORT_SYMBOL(iscsit_response_queue);
6f3c0e69 3788
2ec5a8c1
NB		 3789static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3790{
3791 struct iscsit_transport *t = conn->conn_transport;
3792 struct iscsi_queue_req *qr;
3793 struct iscsi_cmd *cmd;
3794 u8 state;
3795 int ret;
3796
3797 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3798 cmd = qr->cmd;
3799 state = qr->state;
3800 kmem_cache_free(lio_qr_cache, qr);
3801
3802 ret = t->iscsit_response_queue(conn, cmd, state);
3803 if (ret == 1 || ret < 0)
3804 return ret;
3805 }
3806
3807 return 0;
3808}
3809
6f3c0e69
AG		 3810int iscsi_target_tx_thread(void *arg)
3811{
e48354ce 3812 int ret = 0;
88dcd2da 3813 struct iscsi_conn *conn = arg;
e48354ce
NB		 3814 /*
3815 * Allow ourselves to be interrupted by SIGINT so that a
3816 * connection recovery / failure event can be triggered externally.
3817 */
3818 allow_signal(SIGINT);
3819
e48354ce
NB		 3820 while (!kthread_should_stop()) {
3821 /*
3822 * Ensure that both TX and RX per connection kthreads
3823 * are scheduled to run on the same CPU.
3824 */
3825 iscsit_thread_check_cpumask(conn, current, 1);
3826
d5627acb 3827 wait_event_interruptible(conn->queues_wq,
88dcd2da 3828 !iscsit_conn_all_queues_empty(conn));
e48354ce 3829
88dcd2da 3830 if (signal_pending(current))
e48354ce
NB		 3831 goto transport_err;
3832
fd3a9025 3833get_immediate:
2ec5a8c1 3834 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3835 if (ret < 0)
3836 goto transport_err;
e48354ce 3837
2ec5a8c1 3838 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3839 if (ret == 1)
3840 goto get_immediate;
88dcd2da
NB		 3841 else if (ret == -ECONNRESET)
3842 goto out;
6f3c0e69
AG		 3843 else if (ret < 0)
3844 goto transport_err;
e48354ce
NB		 3845 }
3846
3847transport_err:
e5419865
NB		 3848 /*
3849 * Avoid the normal connection failure code-path if this connection
3850 * is still within LOGIN mode, and iscsi_np process context is
3851 * responsible for cleaning up the early connection failure.
3852 */
3853 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3854 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 3855out:
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;
4028
4029 /*
4030 * Allow ourselves to be interrupted by SIGINT so that a
4031 * connection recovery / failure event can be triggered externally.
4032 */
4033 allow_signal(SIGINT);
4034 /*
4035 * Wait for iscsi_post_login_handler() to complete before allowing
4036 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4037 */
4038 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4039 if (rc < 0 || iscsi_target_check_conn_state(conn))
4040 return 0;
4041
4042 if (!conn->conn_transport->iscsit_get_rx_pdu)
4043 return 0;
4044
4045 conn->conn_transport->iscsit_get_rx_pdu(conn);
e48354ce 4046
e48354ce
NB		 4047 if (!signal_pending(current))
4048 atomic_set(&conn->transport_failed, 1);
4049 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 4050 return 0;
4051}
4052
4053static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4054{
064cdd2d 4055 LIST_HEAD(tmp_list);
e48354ce
NB		 4056 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4057 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4058 /*
4059 * We expect this function to only ever be called from either RX or TX
4060 * thread context via iscsit_close_connection() once the other context
4061 * has been reset -> returned sleeping pre-handler state.
4062 */
4063 spin_lock_bh(&conn->cmd_lock);
064cdd2d 4064 list_splice_init(&conn->conn_cmd_list, &tmp_list);
e48354ce 4065
064cdd2d
NB		 4066 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4067 struct se_cmd *se_cmd = &cmd->se_cmd;
4068
4069 if (se_cmd->se_tfo != NULL) {
4070 spin_lock(&se_cmd->t_state_lock);
4071 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4072 spin_unlock(&se_cmd->t_state_lock);
4073 }
4074 }
4075 spin_unlock_bh(&conn->cmd_lock);
4076
4077 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
5159d763 4078 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4079
4080 iscsit_increment_maxcmdsn(cmd, sess);
aafc9d15 4081 iscsit_free_cmd(cmd, true);
e48354ce 4082
e48354ce 4083 }
e48354ce
NB		 4084}
4085
4086static void iscsit_stop_timers_for_cmds(
4087 struct iscsi_conn *conn)
4088{
4089 struct iscsi_cmd *cmd;
4090
4091 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4092 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4093 if (cmd->data_direction == DMA_TO_DEVICE)
4094 iscsit_stop_dataout_timer(cmd);
4095 }
4096 spin_unlock_bh(&conn->cmd_lock);
4097}
4098
4099int iscsit_close_connection(
4100 struct iscsi_conn *conn)
4101{
4102 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4103 struct iscsi_session *sess = conn->sess;
4104
4105 pr_debug("Closing iSCSI connection CID %hu on SID:"
4106 " %u\n", conn->cid, sess->sid);
4107 /*
b4869ee9
VP		 4108 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4109 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4110 * sleeping and the logout response never got sent because the
4111 * connection failed.
f068fbc8
NB		 4112 *
4113 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4114 * to signal logout response TX interrupt completion. Go ahead and skip
4115 * this for iser since isert_rx_opcode() does not wait on logout failure,
4116 * and to avoid iscsi_conn pointer dereference in iser-target code.
e48354ce 4117 */
bd027d85 4118 if (!conn->conn_transport->rdma_shutdown)
f068fbc8 4119 complete(&conn->conn_logout_comp);
e48354ce 4120
88dcd2da
NB		 4121 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4122 if (conn->tx_thread &&
4123 cmpxchg(&conn->tx_thread_active, true, false)) {
4124 send_sig(SIGINT, conn->tx_thread, 1);
4125 kthread_stop(conn->tx_thread);
4126 }
4127 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4128 if (conn->rx_thread &&
4129 cmpxchg(&conn->rx_thread_active, true, false)) {
4130 send_sig(SIGINT, conn->rx_thread, 1);
4131 kthread_stop(conn->rx_thread);
4132 }
4133 }
4134
4135 spin_lock(&iscsit_global->ts_bitmap_lock);
4136 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4137 get_order(1));
4138 spin_unlock(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 4139
4140 iscsit_stop_timers_for_cmds(conn);
4141 iscsit_stop_nopin_response_timer(conn);
4142 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4143
4144 if (conn->conn_transport->iscsit_wait_conn)
4145 conn->conn_transport->iscsit_wait_conn(conn);
4146
e48354ce
NB		 4147 /*
4148 * During Connection recovery drop unacknowledged out of order
4149 * commands for this connection, and prepare the other commands
53c561dc 4150 * for reallegiance.
e48354ce
NB		 4151 *
4152 * During normal operation clear the out of order commands (but
4153 * do not free the struct iscsi_ooo_cmdsn's) and release all
4154 * struct iscsi_cmds.
4155 */
4156 if (atomic_read(&conn->connection_recovery)) {
4157 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
53c561dc 4158 iscsit_prepare_cmds_for_reallegiance(conn);
e48354ce
NB		 4159 } else {
4160 iscsit_clear_ooo_cmdsns_for_conn(conn);
4161 iscsit_release_commands_from_conn(conn);
4162 }
bbc05048 4163 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4164
4165 /*
4166 * Handle decrementing session or connection usage count if
4167 * a logout response was not able to be sent because the
4168 * connection failed. Fall back to Session Recovery here.
4169 */
4170 if (atomic_read(&conn->conn_logout_remove)) {
4171 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4172 iscsit_dec_conn_usage_count(conn);
4173 iscsit_dec_session_usage_count(sess);
4174 }
4175 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4176 iscsit_dec_conn_usage_count(conn);
4177
4178 atomic_set(&conn->conn_logout_remove, 0);
4179 atomic_set(&sess->session_reinstatement, 0);
4180 atomic_set(&sess->session_fall_back_to_erl0, 1);
4181 }
4182
4183 spin_lock_bh(&sess->conn_lock);
4184 list_del(&conn->conn_list);
4185
4186 /*
4187 * Attempt to let the Initiator know this connection failed by
4188 * sending an Connection Dropped Async Message on another
4189 * active connection.
4190 */
4191 if (atomic_read(&conn->connection_recovery))
4192 iscsit_build_conn_drop_async_message(conn);
4193
4194 spin_unlock_bh(&sess->conn_lock);
4195
4196 /*
4197 * If connection reinstatement is being performed on this connection,
4198 * up the connection reinstatement semaphore that is being blocked on
4199 * in iscsit_cause_connection_reinstatement().
4200 */
4201 spin_lock_bh(&conn->state_lock);
4202 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4203 spin_unlock_bh(&conn->state_lock);
4204 complete(&conn->conn_wait_comp);
4205 wait_for_completion(&conn->conn_post_wait_comp);
4206 spin_lock_bh(&conn->state_lock);
4207 }
4208
4209 /*
4210 * If connection reinstatement is being performed on this connection
4211 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4212 * connection wait rcfr semaphore that is being blocked on
4213 * an iscsit_connection_reinstatement_rcfr().
4214 */
4215 if (atomic_read(&conn->connection_wait_rcfr)) {
4216 spin_unlock_bh(&conn->state_lock);
4217 complete(&conn->conn_wait_rcfr_comp);
4218 wait_for_completion(&conn->conn_post_wait_comp);
4219 spin_lock_bh(&conn->state_lock);
4220 }
4221 atomic_set(&conn->connection_reinstatement, 1);
4222 spin_unlock_bh(&conn->state_lock);
4223
4224 /*
4225 * If any other processes are accessing this connection pointer we
4226 * must wait until they have completed.
4227 */
4228 iscsit_check_conn_usage_count(conn);
4229
69110e3c
HX		 4230 ahash_request_free(conn->conn_tx_hash);
4231 if (conn->conn_rx_hash) {
4232 struct crypto_ahash *tfm;
4233
4234 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4235 ahash_request_free(conn->conn_rx_hash);
4236 crypto_free_ahash(tfm);
4237 }
e48354ce 4238
fbecb659 4239 free_cpumask_var(conn->conn_cpumask);
e48354ce
NB		 4240
4241 kfree(conn->conn_ops);
4242 conn->conn_ops = NULL;
4243
bf6932f4 4244 if (conn->sock)
e48354ce 4245 sock_release(conn->sock);
baa4d64b
NB		 4246
4247 if (conn->conn_transport->iscsit_free_conn)
4248 conn->conn_transport->iscsit_free_conn(conn);
4249
4250 iscsit_put_transport(conn->conn_transport);
4251
e48354ce
NB		 4252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4253 conn->conn_state = TARG_CONN_STATE_FREE;
4254 kfree(conn);
4255
4256 spin_lock_bh(&sess->conn_lock);
4257 atomic_dec(&sess->nconn);
4258 pr_debug("Decremented iSCSI connection count to %hu from node:"
4259 " %s\n", atomic_read(&sess->nconn),
4260 sess->sess_ops->InitiatorName);
4261 /*
4262 * Make sure that if one connection fails in an non ERL=2 iSCSI
4263 * Session that they all fail.
4264 */
4265 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4266 !atomic_read(&sess->session_logout))
4267 atomic_set(&sess->session_fall_back_to_erl0, 1);
4268
4269 /*
4270 * If this was not the last connection in the session, and we are
4271 * performing session reinstatement or falling back to ERL=0, call
4272 * iscsit_stop_session() without sleeping to shutdown the other
4273 * active connections.
4274 */
4275 if (atomic_read(&sess->nconn)) {
4276 if (!atomic_read(&sess->session_reinstatement) &&
4277 !atomic_read(&sess->session_fall_back_to_erl0)) {
4278 spin_unlock_bh(&sess->conn_lock);
4279 return 0;
4280 }
4281 if (!atomic_read(&sess->session_stop_active)) {
4282 atomic_set(&sess->session_stop_active, 1);
4283 spin_unlock_bh(&sess->conn_lock);
4284 iscsit_stop_session(sess, 0, 0);
4285 return 0;
4286 }
4287 spin_unlock_bh(&sess->conn_lock);
4288 return 0;
4289 }
4290
4291 /*
4292 * If this was the last connection in the session and one of the
4293 * following is occurring:
4294 *
4295 * Session Reinstatement is not being performed, and are falling back
4296 * to ERL=0 call iscsit_close_session().
4297 *
4298 * Session Logout was requested. iscsit_close_session() will be called
4299 * elsewhere.
4300 *
4301 * Session Continuation is not being performed, start the Time2Retain
4302 * handler and check if sleep_on_sess_wait_sem is active.
4303 */
4304 if (!atomic_read(&sess->session_reinstatement) &&
4305 atomic_read(&sess->session_fall_back_to_erl0)) {
4306 spin_unlock_bh(&sess->conn_lock);
44f33d0f 4307 iscsit_close_session(sess);
e48354ce
NB		 4308
4309 return 0;
4310 } else if (atomic_read(&sess->session_logout)) {
4311 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4312 sess->session_state = TARG_SESS_STATE_FREE;
4313 spin_unlock_bh(&sess->conn_lock);
4314
4315 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4316 complete(&sess->session_wait_comp);
4317
4318 return 0;
4319 } else {
4320 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4321 sess->session_state = TARG_SESS_STATE_FAILED;
4322
4323 if (!atomic_read(&sess->session_continuation)) {
4324 spin_unlock_bh(&sess->conn_lock);
4325 iscsit_start_time2retain_handler(sess);
4326 } else
4327 spin_unlock_bh(&sess->conn_lock);
4328
4329 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4330 complete(&sess->session_wait_comp);
4331
4332 return 0;
4333 }
e48354ce
NB		 4334}
4335
44f33d0f
CH		 4336/*
4337 * If the iSCSI Session for the iSCSI Initiator Node exists,
4338 * forcefully shutdown the iSCSI NEXUS.
4339 */
e48354ce
NB		 4340int iscsit_close_session(struct iscsi_session *sess)
4341{
60bfcf8e 4342 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4343 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4344
4345 if (atomic_read(&sess->nconn)) {
4346 pr_err("%d connection(s) still exist for iSCSI session"
4347 " to %s\n", atomic_read(&sess->nconn),
4348 sess->sess_ops->InitiatorName);
4349 BUG();
4350 }
4351
4352 spin_lock_bh(&se_tpg->session_lock);
4353 atomic_set(&sess->session_logout, 1);
4354 atomic_set(&sess->session_reinstatement, 1);
4355 iscsit_stop_time2retain_timer(sess);
4356 spin_unlock_bh(&se_tpg->session_lock);
4357
4358 /*
4359 * transport_deregister_session_configfs() will clear the
4360 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4361 * can be setting it again with __transport_register_session() in
4362 * iscsi_post_login_handler() again after the iscsit_stop_session()
4363 * completes in iscsi_np context.
4364 */
4365 transport_deregister_session_configfs(sess->se_sess);
4366
4367 /*
4368 * If any other processes are accessing this session pointer we must
4369 * wait until they have completed. If we are in an interrupt (the
4370 * time2retain handler) and contain and active session usage count we
4371 * restart the timer and exit.
4372 */
4373 if (!in_interrupt()) {
4374 if (iscsit_check_session_usage_count(sess) == 1)
4375 iscsit_stop_session(sess, 1, 1);
4376 } else {
4377 if (iscsit_check_session_usage_count(sess) == 2) {
4378 atomic_set(&sess->session_logout, 0);
4379 iscsit_start_time2retain_handler(sess);
4380 return 0;
4381 }
4382 }
4383
4384 transport_deregister_session(sess->se_sess);
4385
4386 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4387 iscsit_free_connection_recovery_entires(sess);
4388
4389 iscsit_free_all_ooo_cmdsns(sess);
4390
4391 spin_lock_bh(&se_tpg->session_lock);
4392 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4393 sess->session_state = TARG_SESS_STATE_FREE;
4394 pr_debug("Released iSCSI session from node: %s\n",
4395 sess->sess_ops->InitiatorName);
4396 tpg->nsessions--;
4397 if (tpg->tpg_tiqn)
4398 tpg->tpg_tiqn->tiqn_nsessions--;
4399
4400 pr_debug("Decremented number of active iSCSI Sessions on"
4401 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4402
4403 spin_lock(&sess_idr_lock);
4404 idr_remove(&sess_idr, sess->session_index);
4405 spin_unlock(&sess_idr_lock);
4406
4407 kfree(sess->sess_ops);
4408 sess->sess_ops = NULL;
4409 spin_unlock_bh(&se_tpg->session_lock);
4410
4411 kfree(sess);
4412 return 0;
4413}
4414
4415static void iscsit_logout_post_handler_closesession(
4416 struct iscsi_conn *conn)
4417{
4418 struct iscsi_session *sess = conn->sess;
007d038b
NB		 4419 int sleep = 1;
4420 /*
4421 * Traditional iscsi/tcp will invoke this logic from TX thread
4422 * context during session logout, so clear tx_thread_active and
4423 * sleep if iscsit_close_connection() has not already occured.
4424 *
4425 * Since iser-target invokes this logic from it's own workqueue,
4426 * always sleep waiting for RX/TX thread shutdown to complete
4427 * within iscsit_close_connection().
4428 */
bd027d85 4429 if (!conn->conn_transport->rdma_shutdown)
007d038b 4430 sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4431
4432 atomic_set(&conn->conn_logout_remove, 0);
4433 complete(&conn->conn_logout_comp);
4434
4435 iscsit_dec_conn_usage_count(conn);
88dcd2da 4436 iscsit_stop_session(sess, sleep, sleep);
e48354ce 4437 iscsit_dec_session_usage_count(sess);
44f33d0f 4438 iscsit_close_session(sess);
e48354ce
NB		 4439}
4440
4441static void iscsit_logout_post_handler_samecid(
4442 struct iscsi_conn *conn)
4443{
007d038b
NB		 4444 int sleep = 1;
4445
bd027d85 4446 if (!conn->conn_transport->rdma_shutdown)
007d038b 4447 sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4448
4449 atomic_set(&conn->conn_logout_remove, 0);
4450 complete(&conn->conn_logout_comp);
4451
88dcd2da 4452 iscsit_cause_connection_reinstatement(conn, sleep);
e48354ce
NB		 4453 iscsit_dec_conn_usage_count(conn);
4454}
4455
4456static void iscsit_logout_post_handler_diffcid(
4457 struct iscsi_conn *conn,
4458 u16 cid)
4459{
4460 struct iscsi_conn *l_conn;
4461 struct iscsi_session *sess = conn->sess;
b53b0d99 4462 bool conn_found = false;
e48354ce
NB		 4463
4464 if (!sess)
4465 return;
4466
4467 spin_lock_bh(&sess->conn_lock);
4468 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4469 if (l_conn->cid == cid) {
4470 iscsit_inc_conn_usage_count(l_conn);
b53b0d99 4471 conn_found = true;
e48354ce
NB		 4472 break;
4473 }
4474 }
4475 spin_unlock_bh(&sess->conn_lock);
4476
b53b0d99 4477 if (!conn_found)
e48354ce
NB		 4478 return;
4479
4480 if (l_conn->sock)
4481 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4482
4483 spin_lock_bh(&l_conn->state_lock);
4484 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4485 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4486 spin_unlock_bh(&l_conn->state_lock);
4487
4488 iscsit_cause_connection_reinstatement(l_conn, 1);
4489 iscsit_dec_conn_usage_count(l_conn);
4490}
4491
4492/*
4493 * Return of 0 causes the TX thread to restart.
4494 */
2ec5a8c1 4495int iscsit_logout_post_handler(
e48354ce
NB		 4496 struct iscsi_cmd *cmd,
4497 struct iscsi_conn *conn)
4498{
4499 int ret = 0;
4500
4501 switch (cmd->logout_reason) {
4502 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4503 switch (cmd->logout_response) {
4504 case ISCSI_LOGOUT_SUCCESS:
4505 case ISCSI_LOGOUT_CLEANUP_FAILED:
4506 default:
4507 iscsit_logout_post_handler_closesession(conn);
4508 break;
4509 }
4510 ret = 0;
4511 break;
4512 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4513 if (conn->cid == cmd->logout_cid) {
4514 switch (cmd->logout_response) {
4515 case ISCSI_LOGOUT_SUCCESS:
4516 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517 default:
4518 iscsit_logout_post_handler_samecid(conn);
4519 break;
4520 }
4521 ret = 0;
4522 } else {
4523 switch (cmd->logout_response) {
4524 case ISCSI_LOGOUT_SUCCESS:
4525 iscsit_logout_post_handler_diffcid(conn,
4526 cmd->logout_cid);
4527 break;
4528 case ISCSI_LOGOUT_CID_NOT_FOUND:
4529 case ISCSI_LOGOUT_CLEANUP_FAILED:
4530 default:
4531 break;
4532 }
4533 ret = 1;
4534 }
4535 break;
4536 case ISCSI_LOGOUT_REASON_RECOVERY:
4537 switch (cmd->logout_response) {
4538 case ISCSI_LOGOUT_SUCCESS:
4539 case ISCSI_LOGOUT_CID_NOT_FOUND:
4540 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4541 case ISCSI_LOGOUT_CLEANUP_FAILED:
4542 default:
4543 break;
4544 }
4545 ret = 1;
4546 break;
4547 default:
4548 break;
4549
4550 }
4551 return ret;
4552}
2ec5a8c1 4553EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4554
4555void iscsit_fail_session(struct iscsi_session *sess)
4556{
4557 struct iscsi_conn *conn;
4558
4559 spin_lock_bh(&sess->conn_lock);
4560 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4561 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4562 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4563 }
4564 spin_unlock_bh(&sess->conn_lock);
4565
4566 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4567 sess->session_state = TARG_SESS_STATE_FAILED;
4568}
4569
4570int iscsit_free_session(struct iscsi_session *sess)
4571{
4572 u16 conn_count = atomic_read(&sess->nconn);
4573 struct iscsi_conn *conn, *conn_tmp = NULL;
4574 int is_last;
4575
4576 spin_lock_bh(&sess->conn_lock);
4577 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4578
4579 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4580 conn_list) {
4581 if (conn_count == 0)
4582 break;
4583
4584 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4585 is_last = 1;
4586 } else {
4587 iscsit_inc_conn_usage_count(conn_tmp);
4588 is_last = 0;
4589 }
4590 iscsit_inc_conn_usage_count(conn);
4591
4592 spin_unlock_bh(&sess->conn_lock);
4593 iscsit_cause_connection_reinstatement(conn, 1);
4594 spin_lock_bh(&sess->conn_lock);
4595
4596 iscsit_dec_conn_usage_count(conn);
4597 if (is_last == 0)
4598 iscsit_dec_conn_usage_count(conn_tmp);
4599
4600 conn_count--;
4601 }
4602
4603 if (atomic_read(&sess->nconn)) {
4604 spin_unlock_bh(&sess->conn_lock);
4605 wait_for_completion(&sess->session_wait_comp);
4606 } else
4607 spin_unlock_bh(&sess->conn_lock);
4608
44f33d0f 4609 iscsit_close_session(sess);
e48354ce
NB		 4610 return 0;
4611}
4612
4613void iscsit_stop_session(
4614 struct iscsi_session *sess,
4615 int session_sleep,
4616 int connection_sleep)
4617{
4618 u16 conn_count = atomic_read(&sess->nconn);
4619 struct iscsi_conn *conn, *conn_tmp = NULL;
4620 int is_last;
4621
4622 spin_lock_bh(&sess->conn_lock);
4623 if (session_sleep)
4624 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4625
4626 if (connection_sleep) {
4627 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4628 conn_list) {
4629 if (conn_count == 0)
4630 break;
4631
4632 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4633 is_last = 1;
4634 } else {
4635 iscsit_inc_conn_usage_count(conn_tmp);
4636 is_last = 0;
4637 }
4638 iscsit_inc_conn_usage_count(conn);
4639
4640 spin_unlock_bh(&sess->conn_lock);
4641 iscsit_cause_connection_reinstatement(conn, 1);
4642 spin_lock_bh(&sess->conn_lock);
4643
4644 iscsit_dec_conn_usage_count(conn);
4645 if (is_last == 0)
4646 iscsit_dec_conn_usage_count(conn_tmp);
4647 conn_count--;
4648 }
4649 } else {
4650 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4651 iscsit_cause_connection_reinstatement(conn, 0);
4652 }
4653
4654 if (session_sleep && atomic_read(&sess->nconn)) {
4655 spin_unlock_bh(&sess->conn_lock);
4656 wait_for_completion(&sess->session_wait_comp);
4657 } else
4658 spin_unlock_bh(&sess->conn_lock);
4659}
4660
4661int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4662{
4663 struct iscsi_session *sess;
4664 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4665 struct se_session *se_sess, *se_sess_tmp;
417c20a9 4666 LIST_HEAD(free_list);
e48354ce
NB		 4667 int session_count = 0;
4668
4669 spin_lock_bh(&se_tpg->session_lock);
4670 if (tpg->nsessions && !force) {
4671 spin_unlock_bh(&se_tpg->session_lock);
4672 return -1;
4673 }
4674
4675 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4676 sess_list) {
4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4678
4679 spin_lock(&sess->conn_lock);
4680 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4681 atomic_read(&sess->session_logout) ||
4682 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4683 spin_unlock(&sess->conn_lock);
4684 continue;
4685 }
4686 atomic_set(&sess->session_reinstatement, 1);
4687 spin_unlock(&sess->conn_lock);
e48354ce 4688
417c20a9
NB		 4689 list_move_tail(&se_sess->sess_list, &free_list);
4690 }
4691 spin_unlock_bh(&se_tpg->session_lock);
e48354ce 4692
417c20a9
NB		 4693 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4694 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4695
4696 iscsit_free_session(sess);
e48354ce
NB		 4697 session_count++;
4698 }
e48354ce
NB		 4699
4700 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4701 " Group: %hu\n", session_count, tpg->tpgt);
4702 return 0;
4703}
4704
4705MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4706MODULE_VERSION("4.1.x");
4707MODULE_AUTHOR("nab@Linux-iSCSI.org");
4708MODULE_LICENSE("GPL");
4709
4710module_init(iscsi_target_init_module);
4711module_exit(iscsi_target_cleanup_module);
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