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scsi: target: iscsi: Wait for all commands to finish before freeing a session
[mirror_ubuntu-bionic-kernel.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
69110e3c 19#include <crypto/hash.h>
e48354ce
NB		 20#include <linux/string.h>
21#include <linux/kthread.h>
e48354ce 22#include <linux/completion.h>
827509e3 23#include <linux/module.h>
5538d294 24#include <linux/vmalloc.h>
40401530 25#include <linux/idr.h>
8dcf07be 26#include <linux/delay.h>
3f07c014 27#include <linux/sched/signal.h>
e48354ce 28#include <asm/unaligned.h>
8dcf07be 29#include <net/ipv6.h>
ba929992 30#include <scsi/scsi_proto.h>
e48354ce 31#include <scsi/iscsi_proto.h>
d28b1169 32#include <scsi/scsi_tcq.h>
e48354ce 33#include <target/target_core_base.h>
c4795fb2 34#include <target/target_core_fabric.h>
e48354ce 35
67f091f2 36#include <target/iscsi/iscsi_target_core.h>
e48354ce
NB		 37#include "iscsi_target_parameters.h"
38#include "iscsi_target_seq_pdu_list.h"
e48354ce
NB		 39#include "iscsi_target_datain_values.h"
40#include "iscsi_target_erl0.h"
41#include "iscsi_target_erl1.h"
42#include "iscsi_target_erl2.h"
43#include "iscsi_target_login.h"
44#include "iscsi_target_tmr.h"
45#include "iscsi_target_tpg.h"
46#include "iscsi_target_util.h"
47#include "iscsi_target.h"
48#include "iscsi_target_device.h"
67f091f2 49#include <target/iscsi/iscsi_target_stat.h>
e48354ce 50
baa4d64b
NB		 51#include <target/iscsi/iscsi_transport.h>
52
e48354ce
NB		 53static LIST_HEAD(g_tiqn_list);
54static LIST_HEAD(g_np_list);
55static DEFINE_SPINLOCK(tiqn_lock);
ee291e63 56static DEFINE_MUTEX(np_lock);
e48354ce
NB		 57
58static struct idr tiqn_idr;
59struct idr sess_idr;
60struct mutex auth_id_lock;
61spinlock_t sess_idr_lock;
62
63struct iscsit_global *iscsit_global;
64
e48354ce
NB		 65struct kmem_cache *lio_qr_cache;
66struct kmem_cache *lio_dr_cache;
67struct kmem_cache *lio_ooo_cache;
68struct kmem_cache *lio_r2t_cache;
69
70static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 71 struct iscsi_scsi_req *, u32);
e48354ce
NB		 72
73struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
74{
75 struct iscsi_tiqn *tiqn = NULL;
76
77 spin_lock(&tiqn_lock);
78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
79 if (!strcmp(tiqn->tiqn, buf)) {
80
81 spin_lock(&tiqn->tiqn_state_lock);
82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
83 tiqn->tiqn_access_count++;
84 spin_unlock(&tiqn->tiqn_state_lock);
85 spin_unlock(&tiqn_lock);
86 return tiqn;
87 }
88 spin_unlock(&tiqn->tiqn_state_lock);
89 }
90 }
91 spin_unlock(&tiqn_lock);
92
93 return NULL;
94}
95
96static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
97{
98 spin_lock(&tiqn->tiqn_state_lock);
99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
101 spin_unlock(&tiqn->tiqn_state_lock);
102 return 0;
103 }
104 spin_unlock(&tiqn->tiqn_state_lock);
105
106 return -1;
107}
108
109void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
110{
111 spin_lock(&tiqn->tiqn_state_lock);
112 tiqn->tiqn_access_count--;
113 spin_unlock(&tiqn->tiqn_state_lock);
114}
115
116/*
117 * Note that IQN formatting is expected to be done in userspace, and
118 * no explict IQN format checks are done here.
119 */
120struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
121{
122 struct iscsi_tiqn *tiqn = NULL;
123 int ret;
124
8f50c7f5 125 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 126 pr_err("Target IQN exceeds %d bytes\n",
127 ISCSI_IQN_LEN);
128 return ERR_PTR(-EINVAL);
129 }
130
3829f381 131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
c46e22f1 132 if (!tiqn)
e48354ce 133 return ERR_PTR(-ENOMEM);
e48354ce
NB		 134
135 sprintf(tiqn->tiqn, "%s", buf);
136 INIT_LIST_HEAD(&tiqn->tiqn_list);
137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
138 spin_lock_init(&tiqn->tiqn_state_lock);
139 spin_lock_init(&tiqn->tiqn_tpg_lock);
140 spin_lock_init(&tiqn->sess_err_stats.lock);
141 spin_lock_init(&tiqn->login_stats.lock);
142 spin_lock_init(&tiqn->logout_stats.lock);
143
e48354ce
NB		 144 tiqn->tiqn_state = TIQN_STATE_ACTIVE;
145
c9365bd0 146 idr_preload(GFP_KERNEL);
e48354ce 147 spin_lock(&tiqn_lock);
c9365bd0
TH		 148
149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
e48354ce 150 if (ret < 0) {
c9365bd0 151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
e48354ce 152 spin_unlock(&tiqn_lock);
c9365bd0 153 idr_preload_end();
e48354ce
NB		 154 kfree(tiqn);
155 return ERR_PTR(ret);
156 }
c9365bd0 157 tiqn->tiqn_index = ret;
e48354ce 158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
c9365bd0 159
e48354ce 160 spin_unlock(&tiqn_lock);
c9365bd0 161 idr_preload_end();
e48354ce
NB		 162
163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
164
165 return tiqn;
166
167}
168
169static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
170{
171 /*
172 * Wait for accesses to said struct iscsi_tiqn to end.
173 */
174 spin_lock(&tiqn->tiqn_state_lock);
175 while (tiqn->tiqn_access_count != 0) {
176 spin_unlock(&tiqn->tiqn_state_lock);
177 msleep(10);
178 spin_lock(&tiqn->tiqn_state_lock);
179 }
180 spin_unlock(&tiqn->tiqn_state_lock);
181}
182
183void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
184{
185 /*
186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
187 * while holding tiqn->tiqn_state_lock. This means that all subsequent
188 * attempts to access this struct iscsi_tiqn will fail from both transport
189 * fabric and control code paths.
190 */
191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
192 pr_err("iscsit_set_tiqn_shutdown() failed\n");
193 return;
194 }
195
196 iscsit_wait_for_tiqn(tiqn);
197
198 spin_lock(&tiqn_lock);
199 list_del(&tiqn->tiqn_list);
200 idr_remove(&tiqn_idr, tiqn->tiqn_index);
201 spin_unlock(&tiqn_lock);
202
203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
204 tiqn->tiqn);
205 kfree(tiqn);
206}
207
208int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
209{
210 int ret;
211 /*
212 * Determine if the network portal is accepting storage traffic.
213 */
214 spin_lock_bh(&np->np_thread_lock);
215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
216 spin_unlock_bh(&np->np_thread_lock);
217 return -1;
218 }
e48354ce
NB		 219 spin_unlock_bh(&np->np_thread_lock);
220 /*
221 * Determine if the portal group is accepting storage traffic.
222 */
223 spin_lock_bh(&tpg->tpg_state_lock);
224 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
225 spin_unlock_bh(&tpg->tpg_state_lock);
226 return -1;
227 }
228 spin_unlock_bh(&tpg->tpg_state_lock);
229
230 /*
231 * Here we serialize access across the TIQN+TPG Tuple.
232 */
a91eb7d9 233 ret = down_interruptible(&tpg->np_login_sem);
ee7619f2 234 if (ret != 0)
e48354ce
NB		 235 return -1;
236
a91eb7d9
NB		 237 spin_lock_bh(&tpg->tpg_state_lock);
238 if (tpg->tpg_state != TPG_STATE_ACTIVE) {
239 spin_unlock_bh(&tpg->tpg_state_lock);
240 up(&tpg->np_login_sem);
241 return -1;
242 }
243 spin_unlock_bh(&tpg->tpg_state_lock);
e48354ce
NB		 244
245 return 0;
246}
247
a91eb7d9
NB		 248void iscsit_login_kref_put(struct kref *kref)
249{
250 struct iscsi_tpg_np *tpg_np = container_of(kref,
251 struct iscsi_tpg_np, tpg_np_kref);
252
253 complete(&tpg_np->tpg_np_comp);
254}
255
256int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
257 struct iscsi_tpg_np *tpg_np)
e48354ce
NB		 258{
259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
260
a91eb7d9 261 up(&tpg->np_login_sem);
e48354ce 262
a91eb7d9
NB		 263 if (tpg_np)
264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
e48354ce
NB		 265
266 if (tiqn)
267 iscsit_put_tiqn_for_login(tiqn);
268
269 return 0;
270}
271
05b96892 272bool iscsit_check_np_match(
13a3cf08 273 struct sockaddr_storage *sockaddr,
05b96892 274 struct iscsi_np *np,
e48354ce
NB		 275 int network_transport)
276{
277 struct sockaddr_in *sock_in, *sock_in_e;
278 struct sockaddr_in6 *sock_in6, *sock_in6_e;
05b96892 279 bool ip_match = false;
69d75574 280 u16 port, port_e;
e48354ce 281
05b96892
NB		 282 if (sockaddr->ss_family == AF_INET6) {
283 sock_in6 = (struct sockaddr_in6 *)sockaddr;
284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
285
286 if (!memcmp(&sock_in6->sin6_addr.in6_u,
287 &sock_in6_e->sin6_addr.in6_u,
288 sizeof(struct in6_addr)))
289 ip_match = true;
290
291 port = ntohs(sock_in6->sin6_port);
69d75574 292 port_e = ntohs(sock_in6_e->sin6_port);
05b96892
NB		 293 } else {
294 sock_in = (struct sockaddr_in *)sockaddr;
295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
296
297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
298 ip_match = true;
299
300 port = ntohs(sock_in->sin_port);
69d75574 301 port_e = ntohs(sock_in_e->sin_port);
05b96892
NB		 302 }
303
69d75574 304 if (ip_match && (port_e == port) &&
05b96892
NB		 305 (np->np_network_transport == network_transport))
306 return true;
307
308 return false;
309}
310
ee291e63
AG		 311/*
312 * Called with mutex np_lock held
313 */
05b96892 314static struct iscsi_np *iscsit_get_np(
13a3cf08 315 struct sockaddr_storage *sockaddr,
05b96892
NB		 316 int network_transport)
317{
318 struct iscsi_np *np;
319 bool match;
320
e48354ce 321 list_for_each_entry(np, &g_np_list, np_list) {
ee291e63 322 spin_lock_bh(&np->np_thread_lock);
e48354ce 323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
ee291e63 324 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 325 continue;
326 }
327
05b96892 328 match = iscsit_check_np_match(sockaddr, np, network_transport);
0bcc297e 329 if (match) {
e48354ce
NB		 330 /*
331 * Increment the np_exports reference count now to
332 * prevent iscsit_del_np() below from being called
333 * while iscsi_tpg_add_network_portal() is called.
334 */
335 np->np_exports++;
ee291e63 336 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 337 return np;
338 }
ee291e63 339 spin_unlock_bh(&np->np_thread_lock);
e48354ce 340 }
e48354ce
NB		 341
342 return NULL;
343}
344
345struct iscsi_np *iscsit_add_np(
13a3cf08 346 struct sockaddr_storage *sockaddr,
e48354ce
NB		 347 int network_transport)
348{
e48354ce
NB		 349 struct iscsi_np *np;
350 int ret;
ee291e63
AG		 351
352 mutex_lock(&np_lock);
353
e48354ce
NB		 354 /*
355 * Locate the existing struct iscsi_np if already active..
356 */
357 np = iscsit_get_np(sockaddr, network_transport);
ee291e63
AG		 358 if (np) {
359 mutex_unlock(&np_lock);
e48354ce 360 return np;
ee291e63 361 }
e48354ce 362
3829f381 363 np = kzalloc(sizeof(*np), GFP_KERNEL);
e48354ce 364 if (!np) {
ee291e63 365 mutex_unlock(&np_lock);
e48354ce
NB		 366 return ERR_PTR(-ENOMEM);
367 }
368
369 np->np_flags |= NPF_IP_NETWORK;
e48354ce
NB		 370 np->np_network_transport = network_transport;
371 spin_lock_init(&np->np_thread_lock);
372 init_completion(&np->np_restart_comp);
373 INIT_LIST_HEAD(&np->np_list);
374
f7c9564a 375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
8a47aa9d 376
e48354ce
NB		 377 ret = iscsi_target_setup_login_socket(np, sockaddr);
378 if (ret != 0) {
379 kfree(np);
ee291e63 380 mutex_unlock(&np_lock);
e48354ce
NB		 381 return ERR_PTR(ret);
382 }
383
384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
385 if (IS_ERR(np->np_thread)) {
386 pr_err("Unable to create kthread: iscsi_np\n");
387 ret = PTR_ERR(np->np_thread);
388 kfree(np);
ee291e63 389 mutex_unlock(&np_lock);
e48354ce
NB		 390 return ERR_PTR(ret);
391 }
392 /*
393 * Increment the np_exports reference count now to prevent
394 * iscsit_del_np() below from being run while a new call to
395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
396 * active. We don't need to hold np->np_thread_lock at this
397 * point because iscsi_np has not been added to g_np_list yet.
398 */
399 np->np_exports = 1;
ee291e63 400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 401
e48354ce 402 list_add_tail(&np->np_list, &g_np_list);
ee291e63 403 mutex_unlock(&np_lock);
e48354ce 404
69d75574
AG		 405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
406 &np->np_sockaddr, np->np_transport->name);
e48354ce
NB		 407
408 return np;
409}
410
411int iscsit_reset_np_thread(
412 struct iscsi_np *np,
413 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 414 struct iscsi_portal_group *tpg,
415 bool shutdown)
e48354ce
NB		 416{
417 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
419 spin_unlock_bh(&np->np_thread_lock);
420 return 0;
421 }
422 np->np_thread_state = ISCSI_NP_THREAD_RESET;
978d13d6 423 atomic_inc(&np->np_reset_count);
e48354ce
NB		 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 487{
a4467018 488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
2ec5a8c1 489}
d2faaefb 490EXPORT_SYMBOL(iscsit_queue_rsp);
2ec5a8c1 491
d2faaefb 492void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
131e6abc 493{
131e6abc 494 spin_lock_bh(&conn->cmd_lock);
064cdd2d
NB		 495 if (!list_empty(&cmd->i_conn_node) &&
496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
131e6abc
NB		 497 list_del_init(&cmd->i_conn_node);
498 spin_unlock_bh(&conn->cmd_lock);
499
4412a671 500 __iscsit_free_cmd(cmd, true);
131e6abc 501}
d2faaefb 502EXPORT_SYMBOL(iscsit_aborted_task);
131e6abc 503
2854bb23 504static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
e1dfb21f 505 u32, u32, const void *, void *);
2854bb23
VP		 506static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
507
508static int
509iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
510 const void *data_buf, u32 data_buf_len)
511{
512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
513 struct kvec *iov;
514 u32 niov = 0, tx_size = ISCSI_HDR_LEN;
515 int ret;
516
517 iov = &cmd->iov_misc[0];
518 iov[niov].iov_base = cmd->pdu;
519 iov[niov++].iov_len = ISCSI_HDR_LEN;
520
521 if (conn->conn_ops->HeaderDigest) {
522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
523
524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
525 ISCSI_HDR_LEN, 0, NULL,
e1dfb21f 526 header_digest);
2854bb23
VP		 527
528 iov[0].iov_len += ISCSI_CRC_LEN;
529 tx_size += ISCSI_CRC_LEN;
530 pr_debug("Attaching CRC32C HeaderDigest"
531 " to opcode 0x%x 0x%08x\n",
532 hdr->opcode, *header_digest);
533 }
534
535 if (data_buf_len) {
536 u32 padding = ((-data_buf_len) & 3);
537
538 iov[niov].iov_base = (void *)data_buf;
539 iov[niov++].iov_len = data_buf_len;
540 tx_size += data_buf_len;
541
542 if (padding != 0) {
543 iov[niov].iov_base = &cmd->pad_bytes;
544 iov[niov++].iov_len = padding;
545 tx_size += padding;
546 pr_debug("Attaching %u additional"
547 " padding bytes.\n", padding);
548 }
549
550 if (conn->conn_ops->DataDigest) {
551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
552 data_buf, data_buf_len,
e1dfb21f
BVA		 553 padding, &cmd->pad_bytes,
554 &cmd->data_crc);
2854bb23
VP		 555
556 iov[niov].iov_base = &cmd->data_crc;
557 iov[niov++].iov_len = ISCSI_CRC_LEN;
558 tx_size += ISCSI_CRC_LEN;
559 pr_debug("Attached DataDigest for %u"
560 " bytes opcode 0x%x, CRC 0x%08x\n",
561 data_buf_len, hdr->opcode, cmd->data_crc);
562 }
563 }
564
565 cmd->iov_misc_count = niov;
566 cmd->tx_size = tx_size;
567
568 ret = iscsit_send_tx_data(cmd, conn, 1);
569 if (ret < 0) {
570 iscsit_tx_thread_wait_for_tcp(conn);
571 return ret;
572 }
573
574 return 0;
575}
576
577static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
578static void iscsit_unmap_iovec(struct iscsi_cmd *);
579static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
580 u32, u32, u32, u8 *);
581static int
582iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
583 const struct iscsi_datain *datain)
584{
585 struct kvec *iov;
586 u32 iov_count = 0, tx_size = 0;
587 int ret, iov_ret;
588
589 iov = &cmd->iov_data[0];
590 iov[iov_count].iov_base = cmd->pdu;
591 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
592 tx_size += ISCSI_HDR_LEN;
593
594 if (conn->conn_ops->HeaderDigest) {
595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
596
597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
598 ISCSI_HDR_LEN, 0, NULL,
e1dfb21f 599 header_digest);
2854bb23
VP		 600
601 iov[0].iov_len += ISCSI_CRC_LEN;
602 tx_size += ISCSI_CRC_LEN;
603
604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
605 *header_digest);
606 }
607
608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
609 datain->offset, datain->length);
610 if (iov_ret < 0)
611 return -1;
612
613 iov_count += iov_ret;
614 tx_size += datain->length;
615
616 cmd->padding = ((-datain->length) & 3);
617 if (cmd->padding) {
618 iov[iov_count].iov_base = cmd->pad_bytes;
619 iov[iov_count++].iov_len = cmd->padding;
620 tx_size += cmd->padding;
621
622 pr_debug("Attaching %u padding bytes\n", cmd->padding);
623 }
624
625 if (conn->conn_ops->DataDigest) {
626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
627 cmd, datain->offset,
628 datain->length,
629 cmd->padding,
630 cmd->pad_bytes);
631
632 iov[iov_count].iov_base = &cmd->data_crc;
633 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
634 tx_size += ISCSI_CRC_LEN;
635
636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
637 datain->length + cmd->padding, cmd->data_crc);
638 }
639
640 cmd->iov_data_count = iov_count;
641 cmd->tx_size = tx_size;
642
643 ret = iscsit_fe_sendpage_sg(cmd, conn);
644
645 iscsit_unmap_iovec(cmd);
646
647 if (ret < 0) {
648 iscsit_tx_thread_wait_for_tcp(conn);
649 return ret;
650 }
651
652 return 0;
653}
654
655static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
656 struct iscsi_datain_req *dr, const void *buf,
657 u32 buf_len)
658{
659 if (dr)
660 return iscsit_xmit_datain_pdu(conn, cmd, buf);
661 else
662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
663}
664
e70beee7
NB		 665static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
666{
667 return TARGET_PROT_NORMAL;
668}
669
baa4d64b
NB		 670static struct iscsit_transport iscsi_target_transport = {
671 .name = "iSCSI/TCP",
672 .transport_type = ISCSI_TCP,
bd027d85 673 .rdma_shutdown = false,
baa4d64b
NB		 674 .owner = NULL,
675 .iscsit_setup_np = iscsit_setup_np,
676 .iscsit_accept_np = iscsit_accept_np,
677 .iscsit_free_np = iscsit_free_np,
678 .iscsit_get_login_rx = iscsit_get_login_rx,
679 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 681 .iscsit_immediate_queue = iscsit_immediate_queue,
682 .iscsit_response_queue = iscsit_response_queue,
683 .iscsit_queue_data_in = iscsit_queue_rsp,
684 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 685 .iscsit_aborted_task = iscsit_aborted_task,
2854bb23 686 .iscsit_xmit_pdu = iscsit_xmit_pdu,
e8205cca 687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu,
e70beee7 688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
baa4d64b
NB		 689};
690
e48354ce
NB		 691static int __init iscsi_target_init_module(void)
692{
88dcd2da 693 int ret = 0, size;
e48354ce
NB		 694
695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
3829f381 696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
c46e22f1 697 if (!iscsit_global)
e48354ce 698 return -1;
c46e22f1 699
88dcd2da 700 spin_lock_init(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 701 mutex_init(&auth_id_lock);
702 spin_lock_init(&sess_idr_lock);
703 idr_init(&tiqn_idr);
704 idr_init(&sess_idr);
705
9ac8928e
CH		 706 ret = target_register_template(&iscsi_ops);
707 if (ret)
e48354ce
NB		 708 goto out;
709
88dcd2da
NB		 710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
711 iscsit_global->ts_bitmap = vzalloc(size);
c46e22f1 712 if (!iscsit_global->ts_bitmap)
e48354ce 713 goto configfs_out;
e48354ce 714
e48354ce
NB		 715 lio_qr_cache = kmem_cache_create("lio_qr_cache",
716 sizeof(struct iscsi_queue_req),
717 __alignof__(struct iscsi_queue_req), 0, NULL);
718 if (!lio_qr_cache) {
719 pr_err("nable to kmem_cache_create() for"
720 " lio_qr_cache\n");
88dcd2da 721 goto bitmap_out;
e48354ce
NB		 722 }
723
724 lio_dr_cache = kmem_cache_create("lio_dr_cache",
725 sizeof(struct iscsi_datain_req),
726 __alignof__(struct iscsi_datain_req), 0, NULL);
727 if (!lio_dr_cache) {
728 pr_err("Unable to kmem_cache_create() for"
729 " lio_dr_cache\n");
730 goto qr_out;
731 }
732
733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
734 sizeof(struct iscsi_ooo_cmdsn),
735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
736 if (!lio_ooo_cache) {
737 pr_err("Unable to kmem_cache_create() for"
738 " lio_ooo_cache\n");
739 goto dr_out;
740 }
741
742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
744 0, NULL);
745 if (!lio_r2t_cache) {
746 pr_err("Unable to kmem_cache_create() for"
747 " lio_r2t_cache\n");
748 goto ooo_out;
749 }
750
baa4d64b
NB		 751 iscsit_register_transport(&iscsi_target_transport);
752
e48354ce
NB		 753 if (iscsit_load_discovery_tpg() < 0)
754 goto r2t_out;
755
756 return ret;
757r2t_out:
7f2c53bb 758 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 759 kmem_cache_destroy(lio_r2t_cache);
760ooo_out:
761 kmem_cache_destroy(lio_ooo_cache);
762dr_out:
763 kmem_cache_destroy(lio_dr_cache);
764qr_out:
765 kmem_cache_destroy(lio_qr_cache);
88dcd2da
NB		 766bitmap_out:
767 vfree(iscsit_global->ts_bitmap);
e48354ce 768configfs_out:
9ac8928e
CH		 769 /* XXX: this probably wants it to be it's own unwind step.. */
770 if (iscsit_global->discovery_tpg)
771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
772 target_unregister_template(&iscsi_ops);
e48354ce
NB		 773out:
774 kfree(iscsit_global);
775 return -ENOMEM;
776}
777
778static void __exit iscsi_target_cleanup_module(void)
779{
e48354ce 780 iscsit_release_discovery_tpg();
baa4d64b 781 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 782 kmem_cache_destroy(lio_qr_cache);
783 kmem_cache_destroy(lio_dr_cache);
784 kmem_cache_destroy(lio_ooo_cache);
785 kmem_cache_destroy(lio_r2t_cache);
786
9ac8928e
CH		 787 /*
788 * Shutdown discovery sessions and disable discovery TPG
789 */
790 if (iscsit_global->discovery_tpg)
791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
e48354ce 792
9ac8928e 793 target_unregister_template(&iscsi_ops);
e48354ce 794
88dcd2da 795 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 796 kfree(iscsit_global);
797}
798
d2faaefb 799int iscsit_add_reject(
ba159914 800 struct iscsi_conn *conn,
e48354ce 801 u8 reason,
ba159914 802 unsigned char *buf)
e48354ce
NB		 803{
804 struct iscsi_cmd *cmd;
e48354ce 805
676687c6 806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 807 if (!cmd)
808 return -1;
809
810 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 811 cmd->reject_reason = reason;
e48354ce 812
1c3d5794 813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 814 if (!cmd->buf_ptr) {
815 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 816 iscsit_free_cmd(cmd, false);
e48354ce
NB		 817 return -1;
818 }
e48354ce
NB		 819
820 spin_lock_bh(&conn->cmd_lock);
2fbb471e 821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 822 spin_unlock_bh(&conn->cmd_lock);
823
824 cmd->i_state = ISTATE_SEND_REJECT;
825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
826
ba159914 827 return -1;
e48354ce 828}
d2faaefb 829EXPORT_SYMBOL(iscsit_add_reject);
e48354ce 830
ba159914
NB		 831static int iscsit_add_reject_from_cmd(
832 struct iscsi_cmd *cmd,
e48354ce 833 u8 reason,
ba159914
NB		 834 bool add_to_conn,
835 unsigned char *buf)
e48354ce
NB		 836{
837 struct iscsi_conn *conn;
cfe2b621 838 const bool do_put = cmd->se_cmd.se_tfo != NULL;
e48354ce
NB		 839
840 if (!cmd->conn) {
841 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
842 cmd->init_task_tag);
843 return -1;
844 }
845 conn = cmd->conn;
846
847 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 848 cmd->reject_reason = reason;
e48354ce 849
1c3d5794 850 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 851 if (!cmd->buf_ptr) {
852 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 853 iscsit_free_cmd(cmd, false);
e48354ce
NB		 854 return -1;
855 }
e48354ce
NB		 856
857 if (add_to_conn) {
858 spin_lock_bh(&conn->cmd_lock);
2fbb471e 859 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 860 spin_unlock_bh(&conn->cmd_lock);
861 }
862
863 cmd->i_state = ISTATE_SEND_REJECT;
864 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 865 /*
866 * Perform the kref_put now if se_cmd has already been setup by
867 * scsit_setup_scsi_cmd()
868 */
cfe2b621 869 if (do_put) {
3e1c81a9 870 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
afc16604 871 target_put_sess_cmd(&cmd->se_cmd);
3e1c81a9 872 }
ba159914
NB		 873 return -1;
874}
e48354ce 875
ba159914
NB		 876static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
877 unsigned char *buf)
878{
879 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
880}
881
882int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
883{
884 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce 885}
d2faaefb 886EXPORT_SYMBOL(iscsit_reject_cmd);
e48354ce
NB		 887
888/*
889 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 890 * kernel sockets to copy data in/out.
e48354ce
NB		 891 */
892static int iscsit_map_iovec(
893 struct iscsi_cmd *cmd,
894 struct kvec *iov,
895 u32 data_offset,
896 u32 data_length)
897{
898 u32 i = 0;
899 struct scatterlist *sg;
900 unsigned int page_off;
901
902 /*
bfb79eac 903 * We know each entry in t_data_sg contains a page.
e48354ce 904 */
2b16509c
IH		 905 u32 ent = data_offset / PAGE_SIZE;
906
907 if (ent >= cmd->se_cmd.t_data_nents) {
908 pr_err("Initial page entry out-of-bounds\n");
909 return -1;
910 }
911
912 sg = &cmd->se_cmd.t_data_sg[ent];
e48354ce
NB		 913 page_off = (data_offset % PAGE_SIZE);
914
915 cmd->first_data_sg = sg;
916 cmd->first_data_sg_off = page_off;
917
918 while (data_length) {
919 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
920
921 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
922 iov[i].iov_len = cur_len;
923
924 data_length -= cur_len;
925 page_off = 0;
926 sg = sg_next(sg);
927 i++;
928 }
929
930 cmd->kmapped_nents = i;
931
932 return i;
933}
934
935static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
936{
937 u32 i;
938 struct scatterlist *sg;
939
940 sg = cmd->first_data_sg;
941
942 for (i = 0; i < cmd->kmapped_nents; i++)
943 kunmap(sg_page(&sg[i]));
944}
945
946static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
947{
f56cbbb4
NB		 948 LIST_HEAD(ack_list);
949 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 950
951 conn->exp_statsn = exp_statsn;
952
3e1c81a9
NB		 953 if (conn->sess->sess_ops->RDMAExtensions)
954 return;
955
e48354ce 956 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 957 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 958 spin_lock(&cmd->istate_lock);
959 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 960 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 961 cmd->i_state = ISTATE_REMOVE;
962 spin_unlock(&cmd->istate_lock);
f56cbbb4 963 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 964 continue;
965 }
966 spin_unlock(&cmd->istate_lock);
967 }
968 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 969
970 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 971 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 972 iscsit_free_cmd(cmd, false);
973 }
e48354ce
NB		 974}
975
976static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
977{
f80e8ed3 978 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 979
c0427f15 980 iov_count += ISCSI_IOV_DATA_BUFFER;
f1725110 981 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
c46e22f1 982 if (!cmd->iov_data)
e48354ce 983 return -ENOMEM;
e48354ce
NB		 984
985 cmd->orig_iov_data_count = iov_count;
986 return 0;
987}
988
3e1c81a9
NB		 989int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
990 unsigned char *buf)
e48354ce 991{
3e1c81a9 992 int data_direction, payload_length;
e48354ce 993 struct iscsi_scsi_req *hdr;
d28b1169
AG		 994 int iscsi_task_attr;
995 int sam_task_attr;
e48354ce 996
04f3b31b 997 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 998
999 hdr = (struct iscsi_scsi_req *) buf;
1000 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 1001
1002 /* FIXME; Add checks for AdditionalHeaderSegment */
1003
1004 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 1008 return iscsit_add_reject_cmd(cmd,
1009 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1010 }
1011
1012 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014 /*
4454b66c
NB		 1015 * From RFC-3720 Section 10.3.1:
1016 *
1017 * "Either or both of R and W MAY be 1 when either the
1018 * Expected Data Transfer Length and/or Bidirectional Read
1019 * Expected Data Transfer Length are 0"
1020 *
1021 * For this case, go ahead and clear the unnecssary bits
1022 * to avoid any confusion with ->data_direction.
e48354ce 1023 */
4454b66c
NB		 1024 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 1026
4454b66c 1027 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 1028 " set when Expected Data Transfer Length is 0 for"
4454b66c 1029 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 1030 }
e48354ce
NB		 1031
1032 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035 " MUST be set if Expected Data Transfer Length is not 0."
1036 " Bad iSCSI Initiator\n");
ba159914
NB		 1037 return iscsit_add_reject_cmd(cmd,
1038 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1039 }
1040
1041 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 1044 return iscsit_add_reject_cmd(cmd,
1045 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1046 }
1047
1048 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050 " Scsi Command PDU.\n");
ba159914
NB		 1051 return iscsit_add_reject_cmd(cmd,
1052 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1053 }
1054
1055 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057 " protocol error.\n", payload_length);
ba159914
NB		 1058 return iscsit_add_reject_cmd(cmd,
1059 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1060 }
1061
ba159914 1062 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 1063 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064 pr_err("Expected Data Transfer Length and Length of"
1065 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066 " bit is not set protocol error\n");
ba159914
NB		 1067 return iscsit_add_reject_cmd(cmd,
1068 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1069 }
1070
50e5c87d 1071 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 1072 pr_err("DataSegmentLength: %u is greater than"
1073 " EDTL: %u, protocol error.\n", payload_length,
1074 hdr->data_length);
ba159914
NB		 1075 return iscsit_add_reject_cmd(cmd,
1076 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1077 }
1078
21f5aa7e 1079 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1080 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1081 " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1083 return iscsit_add_reject_cmd(cmd,
1084 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1085 }
1086
1087 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088 pr_err("DataSegmentLength: %u is greater than"
1089 " FirstBurstLength: %u, protocol error.\n",
1090 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 1091 return iscsit_add_reject_cmd(cmd,
1092 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1093 }
1094
1095 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097 DMA_NONE;
1098
d28b1169 1099 cmd->data_direction = data_direction;
d28b1169
AG		 1100 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101 /*
1102 * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103 */
1104 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
68d81f40 1106 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169 1107 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
68d81f40 1108 sam_task_attr = TCM_ORDERED_TAG;
d28b1169 1109 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
68d81f40 1110 sam_task_attr = TCM_HEAD_TAG;
d28b1169 1111 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
68d81f40 1112 sam_task_attr = TCM_ACA_TAG;
d28b1169
AG		 1113 else {
1114 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
68d81f40
CH		 1115 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169
AG		 1117 }
1118
e48354ce
NB		 1119 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
1120 cmd->i_state = ISTATE_NEW_CMD;
1121 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122 cmd->immediate_data = (payload_length) ? 1 : 0;
1123 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125 if (cmd->unsolicited_data)
1126 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127
1128 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
9547308b 1129 if (hdr->flags & ISCSI_FLAG_CMD_READ)
c1e34b64 1130 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
9547308b 1131 else
e48354ce 1132 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1133 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1134 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1135 cmd->first_burst_len = payload_length;
1136
3e1c81a9
NB		 1137 if (!conn->sess->sess_ops->RDMAExtensions &&
1138 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 1139 struct iscsi_datain_req *dr;
1140
1141 dr = iscsit_allocate_datain_req();
1142 if (!dr)
ba159914
NB		 1143 return iscsit_add_reject_cmd(cmd,
1144 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1145
1146 iscsit_attach_datain_req(cmd, dr);
1147 }
1148
065ca1e4
AG		 1149 /*
1150 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151 */
9ac8928e 1152 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
50e5c87d
CH		 1153 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154 cmd->data_direction, sam_task_attr,
1155 cmd->sense_buffer + 2);
065ca1e4
AG		 1156
1157 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 1159 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160 conn->cid);
1161
53eb5c32
BVA		 1162 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
1163 return iscsit_add_reject_cmd(cmd,
1164 ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
065ca1e4 1165
de103c93
CH		 1166 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1167 scsilun_to_int(&hdr->lun));
1168 if (cmd->sense_reason)
1169 goto attach_cmd;
1170
649ee054
BVA		 1171 /* only used for printks or comparing with ->ref_task_tag */
1172 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
de103c93
CH		 1173 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1174 if (cmd->sense_reason) {
1175 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1176 return iscsit_add_reject_cmd(cmd,
1177 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1178 }
de103c93 1179
e48354ce
NB		 1180 goto attach_cmd;
1181 }
a12f41f8 1182
de103c93 1183 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1184 return iscsit_add_reject_cmd(cmd,
1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1186 }
1187
1188attach_cmd:
1189 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1190 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1191 spin_unlock_bh(&conn->cmd_lock);
1192 /*
1193 * Check if we need to delay processing because of ALUA
1194 * Active/NonOptimized primary access state..
1195 */
1196 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1197
3e1c81a9
NB		 1198 return 0;
1199}
1200EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1201
3e1c81a9
NB		 1202void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1203{
1204 iscsit_set_dataout_sequence_values(cmd);
1205
1206 spin_lock_bh(&cmd->dataout_timeout_lock);
1207 iscsit_start_dataout_timer(cmd, cmd->conn);
1208 spin_unlock_bh(&cmd->dataout_timeout_lock);
1209}
1210EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1211
1212int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1213 struct iscsi_scsi_req *hdr)
1214{
1215 int cmdsn_ret = 0;
e48354ce
NB		 1216 /*
1217 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1218 * the Immediate Bit is not set, and no Immediate
1219 * Data is attached.
1220 *
1221 * A PDU/CmdSN carrying Immediate Data can only
1222 * be processed after the DataCRC has passed.
1223 * If the DataCRC fails, the CmdSN MUST NOT
1224 * be acknowledged. (See below)
1225 */
1226 if (!cmd->immediate_data) {
561bf158
NB		 1227 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1228 (unsigned char *)hdr, hdr->cmdsn);
1229 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1230 return -1;
1231 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
afc16604 1232 target_put_sess_cmd(&cmd->se_cmd);
7e32da55 1233 return 0;
3e1c81a9 1234 }
e48354ce
NB		 1235 }
1236
50e5c87d 1237 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1238
1239 /*
1240 * If no Immediate Data is attached, it's OK to return now.
1241 */
1242 if (!cmd->immediate_data) {
3e1c81a9
NB		 1243 if (!cmd->sense_reason && cmd->unsolicited_data)
1244 iscsit_set_unsoliticed_dataout(cmd);
1245 if (!cmd->sense_reason)
1246 return 0;
e48354ce 1247
afc16604 1248 target_put_sess_cmd(&cmd->se_cmd);
e48354ce
NB		 1249 return 0;
1250 }
1251
1252 /*
3e1c81a9
NB		 1253 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1254 * execution. These exceptions are processed in CmdSN order using
1255 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1256 */
8fa4011e 1257 if (cmd->sense_reason)
3e1c81a9 1258 return 1;
e48354ce
NB		 1259 /*
1260 * Call directly into transport_generic_new_cmd() to perform
1261 * the backend memory allocation.
1262 */
de103c93 1263 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1264 if (cmd->sense_reason)
3e1c81a9 1265 return 1;
e48354ce 1266
3e1c81a9
NB		 1267 return 0;
1268}
1269EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1270
1271static int
1272iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1273 bool dump_payload)
1274{
1275 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1276 /*
1277 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1278 */
0bcc297e 1279 if (dump_payload)
3e1c81a9 1280 goto after_immediate_data;
abb85a9b
NB		 1281 /*
1282 * Check for underflow case where both EDTL and immediate data payload
1283 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1284 * already been set in target_cmd_size_check() as se_cmd->data_length.
1285 *
1286 * For this special case, fail the command and dump the immediate data
1287 * payload.
1288 */
1289 if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1290 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1291 goto after_immediate_data;
1292 }
3e1c81a9
NB		 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
e1dfb21f
BVA		 1415static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1416 const void *buf, u32 payload_length, u32 padding,
1417 const void *pad_bytes, void *data_crc)
e48354ce 1418{
69110e3c 1419 struct scatterlist sg[2];
e48354ce 1420
69110e3c
HX		 1421 sg_init_table(sg, ARRAY_SIZE(sg));
1422 sg_set_buf(sg, buf, payload_length);
dd2c954f
LA		 1423 if (padding)
1424 sg_set_buf(sg + 1, pad_bytes, padding);
e48354ce 1425
69110e3c 1426 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
e48354ce 1427
69110e3c 1428 crypto_ahash_digest(hash);
e48354ce
NB		 1429}
1430
3e1c81a9 1431int
9a584bf9
VP		 1432__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1433 struct iscsi_cmd *cmd, u32 payload_length,
1434 bool *success)
e48354ce 1435{
9a584bf9 1436 struct iscsi_data *hdr = buf;
e48354ce 1437 struct se_cmd *se_cmd;
3e1c81a9 1438 int rc;
e48354ce 1439
e48354ce 1440 /* iSCSI write */
04f3b31b 1441 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1442
e48354ce
NB		 1443 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1444 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1445 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1446 payload_length, conn->cid);
1447
1448 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1449 pr_err("Command ITT: 0x%08x received DataOUT after"
1450 " last DataOUT received, dumping payload\n",
1451 cmd->init_task_tag);
1452 return iscsit_dump_data_payload(conn, payload_length, 1);
1453 }
1454
1455 if (cmd->data_direction != DMA_TO_DEVICE) {
1456 pr_err("Command ITT: 0x%08x received DataOUT for a"
1457 " NON-WRITE command.\n", cmd->init_task_tag);
97c99b47 1458 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1459 }
1460 se_cmd = &cmd->se_cmd;
1461 iscsit_mod_dataout_timer(cmd);
1462
50e5c87d 1463 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
de3493ae
BVA		 1464 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1465 be32_to_cpu(hdr->offset), payload_length,
1466 cmd->se_cmd.data_length);
ba159914 1467 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1468 }
1469
1470 if (cmd->unsolicited_data) {
1471 int dump_unsolicited_data = 0;
1472
1473 if (conn->sess->sess_ops->InitialR2T) {
1474 pr_err("Received unexpected unsolicited data"
1475 " while InitialR2T=Yes, protocol error.\n");
1476 transport_send_check_condition_and_sense(&cmd->se_cmd,
1477 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1478 return -1;
1479 }
1480 /*
1481 * Special case for dealing with Unsolicited DataOUT
1482 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1483 * failures;
1484 */
1485
1486 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1487 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1488 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1489 dump_unsolicited_data = 1;
e48354ce
NB		 1490
1491 if (dump_unsolicited_data) {
1492 /*
1493 * Check if a delayed TASK_ABORTED status needs to
1494 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
5a342521 1495 * received with the unsolicited data out.
e48354ce
NB		 1496 */
1497 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1498 iscsit_stop_dataout_timer(cmd);
1499
1500 transport_check_aborted_status(se_cmd,
1501 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1502 return iscsit_dump_data_payload(conn, payload_length, 1);
1503 }
1504 } else {
1505 /*
1506 * For the normal solicited data path:
1507 *
1508 * Check for a delayed TASK_ABORTED status and dump any
1509 * incoming data out payload if one exists. Also, when the
1510 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1511 * data out sequence, we decrement outstanding_r2ts. Once
1512 * outstanding_r2ts reaches zero, go ahead and send the delayed
1513 * TASK_ABORTED status.
1514 */
7d680f3b 1515 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1516 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1517 if (--cmd->outstanding_r2ts < 1) {
1518 iscsit_stop_dataout_timer(cmd);
1519 transport_check_aborted_status(
1520 se_cmd, 1);
1521 }
1522
1523 return iscsit_dump_data_payload(conn, payload_length, 1);
1524 }
1525 }
1526 /*
0d5efb8a 1527 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
e48354ce
NB		 1528 * within-command recovery checks before receiving the payload.
1529 */
3e1c81a9
NB		 1530 rc = iscsit_check_pre_dataout(cmd, buf);
1531 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1532 return 0;
3e1c81a9 1533 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce 1534 return -1;
9a584bf9 1535 *success = true;
3e1c81a9
NB		 1536 return 0;
1537}
9a584bf9
VP		 1538EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1539
1540int
1541iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1542 struct iscsi_cmd **out_cmd)
1543{
1544 struct iscsi_data *hdr = buf;
1545 struct iscsi_cmd *cmd;
1546 u32 payload_length = ntoh24(hdr->dlength);
1547 int rc;
1548 bool success = false;
1549
1550 if (!payload_length) {
1551 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1552 return 0;
1553 }
1554
1555 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1556 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1557 " MaxXmitDataSegmentLength: %u\n", payload_length,
1558 conn->conn_ops->MaxXmitDataSegmentLength);
1559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1560 }
1561
1562 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1563 if (!cmd)
1564 return 0;
1565
1566 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1567
1568 if (success)
1569 *out_cmd = cmd;
1570
1571 return rc;
1572}
3e1c81a9
NB		 1573EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1574
1575static int
1576iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1577 struct iscsi_data *hdr)
1578{
1579 struct kvec *iov;
1580 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1581 u32 payload_length = ntoh24(hdr->dlength);
1582 int iov_ret, data_crc_failed = 0;
1583
e48354ce
NB		 1584 rx_size += payload_length;
1585 iov = &cmd->iov_data[0];
1586
50e5c87d
CH		 1587 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1588 payload_length);
e48354ce
NB		 1589 if (iov_ret < 0)
1590 return -1;
1591
1592 iov_count += iov_ret;
1593
1594 padding = ((-payload_length) & 3);
1595 if (padding != 0) {
1596 iov[iov_count].iov_base = cmd->pad_bytes;
1597 iov[iov_count++].iov_len = padding;
1598 rx_size += padding;
1599 pr_debug("Receiving %u padding bytes.\n", padding);
1600 }
1601
1602 if (conn->conn_ops->DataDigest) {
1603 iov[iov_count].iov_base = &checksum;
1604 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1605 rx_size += ISCSI_CRC_LEN;
1606 }
1607
1608 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1609
1610 iscsit_unmap_iovec(cmd);
1611
1612 if (rx_got != rx_size)
1613 return -1;
1614
1615 if (conn->conn_ops->DataDigest) {
1616 u32 data_crc;
1617
69110e3c 1618 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
50e5c87d
CH		 1619 be32_to_cpu(hdr->offset),
1620 payload_length, padding,
e48354ce
NB		 1621 cmd->pad_bytes);
1622
1623 if (checksum != data_crc) {
1624 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1625 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1626 " does not match computed 0x%08x\n",
1627 hdr->itt, hdr->offset, payload_length,
1628 hdr->datasn, checksum, data_crc);
1629 data_crc_failed = 1;
1630 } else {
1631 pr_debug("Got CRC32C DataDigest 0x%08x for"
1632 " %u bytes of Data Out\n", checksum,
1633 payload_length);
1634 }
1635 }
3e1c81a9
NB		 1636
1637 return data_crc_failed;
1638}
1639
1640int
1641iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1642 bool data_crc_failed)
1643{
1644 struct iscsi_conn *conn = cmd->conn;
1645 int rc, ooo_cmdsn;
e48354ce
NB		 1646 /*
1647 * Increment post receive data and CRC values or perform
1648 * within-command recovery.
1649 */
3e1c81a9
NB		 1650 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1651 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1652 return 0;
3e1c81a9 1653 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1654 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1655 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1656 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1657 /*
1658 * Handle extra special case for out of order
1659 * Unsolicited Data Out.
1660 */
1661 spin_lock_bh(&cmd->istate_lock);
1662 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1663 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1664 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1665 spin_unlock_bh(&cmd->istate_lock);
1666
1667 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1668 if (ooo_cmdsn)
1669 return 0;
1670 target_execute_cmd(&cmd->se_cmd);
1671 return 0;
e48354ce
NB		 1672 } else /* DATAOUT_CANNOT_RECOVER */
1673 return -1;
1674
1675 return 0;
1676}
3e1c81a9 1677EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1678
3e1c81a9
NB		 1679static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1680{
dbcbc95c 1681 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1682 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1683 int rc;
1684 bool data_crc_failed = false;
1685
1686 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1687 if (rc < 0)
561bf158 1688 return 0;
3e1c81a9
NB		 1689 else if (!cmd)
1690 return 0;
1691
1692 rc = iscsit_get_dataout(conn, cmd, hdr);
1693 if (rc < 0)
1694 return rc;
1695 else if (rc > 0)
1696 data_crc_failed = true;
1697
1698 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1699}
1700
778de368
NB		 1701int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1702 struct iscsi_nopout *hdr)
e48354ce 1703{
778de368 1704 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1705
a3662605
AH		 1706 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1707 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1708 if (!cmd)
1709 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1710 (unsigned char *)hdr);
1711
1712 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1713 (unsigned char *)hdr);
1714 }
1715
66c7db68 1716 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1717 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1718 " not set, protocol error.\n");
28aaa950
NB		 1719 if (!cmd)
1720 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1721 (unsigned char *)hdr);
1722
ba159914
NB		 1723 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1724 (unsigned char *)hdr);
e48354ce
NB		 1725 }
1726
21f5aa7e 1727 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1728 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1729 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1730 " error.\n", payload_length,
21f5aa7e 1731 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1732 if (!cmd)
1733 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1734 (unsigned char *)hdr);
1735
ba159914
NB		 1736 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1737 (unsigned char *)hdr);
e48354ce
NB		 1738 }
1739
3e1c81a9 1740 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1741 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1742 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1743 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1744 payload_length);
1745 /*
1746 * This is not a response to a Unsolicited NopIN, which means
1747 * it can either be a NOPOUT ping request (with a valid ITT),
1748 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1749 * Either way, make sure we allocate an struct iscsi_cmd, as both
1750 * can contain ping data.
1751 */
50e5c87d 1752 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1753 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1754 cmd->i_state = ISTATE_SEND_NOPIN;
1755 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1756 1 : 0);
1757 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1758 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1759 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1760 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1761 cmd->data_direction = DMA_NONE;
1762 }
1763
778de368
NB		 1764 return 0;
1765}
1766EXPORT_SYMBOL(iscsit_setup_nop_out);
1767
1768int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1769 struct iscsi_nopout *hdr)
1770{
1771 struct iscsi_cmd *cmd_p = NULL;
1772 int cmdsn_ret = 0;
1773 /*
1774 * Initiator is expecting a NopIN ping reply..
1775 */
1776 if (hdr->itt != RESERVED_ITT) {
7cbfcc95
NB		 1777 if (!cmd)
1778 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1779 (unsigned char *)hdr);
778de368
NB		 1780
1781 spin_lock_bh(&conn->cmd_lock);
1782 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1783 spin_unlock_bh(&conn->cmd_lock);
1784
1785 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1786
1787 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1788 iscsit_add_cmd_to_response_queue(cmd, conn,
1789 cmd->i_state);
1790 return 0;
1791 }
1792
561bf158
NB		 1793 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1794 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1795 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1796 return 0;
778de368 1797 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1798 return -1;
778de368
NB		 1799
1800 return 0;
1801 }
1802 /*
1803 * This was a response to a unsolicited NOPIN ping.
1804 */
1805 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1806 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1807 if (!cmd_p)
1808 return -EINVAL;
1809
1810 iscsit_stop_nopin_response_timer(conn);
1811
1812 cmd_p->i_state = ISTATE_REMOVE;
1813 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1814
1815 iscsit_start_nopin_timer(conn);
1816 return 0;
1817 }
1818 /*
1819 * Otherwise, initiator is not expecting a NOPIN is response.
1820 * Just ignore for now.
1821 */
1a40f0a3
VP		 1822
1823 if (cmd)
1824 iscsit_free_cmd(cmd, false);
1825
778de368
NB		 1826 return 0;
1827}
1828EXPORT_SYMBOL(iscsit_process_nop_out);
1829
1830static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1831 unsigned char *buf)
1832{
1833 unsigned char *ping_data = NULL;
1834 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1835 struct kvec *iov = NULL;
1836 u32 payload_length = ntoh24(hdr->dlength);
1837 int ret;
1838
1839 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1840 if (ret < 0)
561bf158 1841 return 0;
778de368
NB		 1842 /*
1843 * Handle NOP-OUT payload for traditional iSCSI sockets
1844 */
50e5c87d 1845 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1846 u32 checksum, data_crc, padding = 0;
1847 int niov = 0, rx_got, rx_size = payload_length;
1848
e48354ce
NB		 1849 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1850 if (!ping_data) {
e48354ce
NB		 1851 ret = -1;
1852 goto out;
1853 }
1854
1855 iov = &cmd->iov_misc[0];
1856 iov[niov].iov_base = ping_data;
1857 iov[niov++].iov_len = payload_length;
1858
1859 padding = ((-payload_length) & 3);
1860 if (padding != 0) {
1861 pr_debug("Receiving %u additional bytes"
1862 " for padding.\n", padding);
1863 iov[niov].iov_base = &cmd->pad_bytes;
1864 iov[niov++].iov_len = padding;
1865 rx_size += padding;
1866 }
1867 if (conn->conn_ops->DataDigest) {
1868 iov[niov].iov_base = &checksum;
1869 iov[niov++].iov_len = ISCSI_CRC_LEN;
1870 rx_size += ISCSI_CRC_LEN;
1871 }
1872
1873 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1874 if (rx_got != rx_size) {
1875 ret = -1;
1876 goto out;
1877 }
1878
1879 if (conn->conn_ops->DataDigest) {
e1dfb21f
BVA		 1880 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1881 payload_length, padding,
1882 cmd->pad_bytes, &data_crc);
e48354ce
NB		 1883
1884 if (checksum != data_crc) {
1885 pr_err("Ping data CRC32C DataDigest"
1886 " 0x%08x does not match computed 0x%08x\n",
1887 checksum, data_crc);
1888 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1889 pr_err("Unable to recover from"
1890 " NOPOUT Ping DataCRC failure while in"
1891 " ERL=0.\n");
1892 ret = -1;
1893 goto out;
1894 } else {
1895 /*
1896 * Silently drop this PDU and let the
1897 * initiator plug the CmdSN gap.
1898 */
1899 pr_debug("Dropping NOPOUT"
1900 " Command CmdSN: 0x%08x due to"
1901 " DataCRC error.\n", hdr->cmdsn);
1902 ret = 0;
1903 goto out;
1904 }
1905 } else {
1906 pr_debug("Got CRC32C DataDigest"
1907 " 0x%08x for %u bytes of ping data.\n",
1908 checksum, payload_length);
1909 }
1910 }
1911
1912 ping_data[payload_length] = '\0';
1913 /*
1914 * Attach ping data to struct iscsi_cmd->buf_ptr.
1915 */
8359cf43 1916 cmd->buf_ptr = ping_data;
e48354ce
NB		 1917 cmd->buf_ptr_size = payload_length;
1918
1919 pr_debug("Got %u bytes of NOPOUT ping"
1920 " data.\n", payload_length);
1921 pr_debug("Ping Data: \"%s\"\n", ping_data);
1922 }
1923
778de368 1924 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1925out:
1926 if (cmd)
aafc9d15 1927 iscsit_free_cmd(cmd, false);
778de368 1928
e48354ce
NB		 1929 kfree(ping_data);
1930 return ret;
1931}
1932
e381fe9e
BVA		 1933static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1934{
1935 switch (iscsi_tmf) {
1936 case ISCSI_TM_FUNC_ABORT_TASK:
1937 return TMR_ABORT_TASK;
1938 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1939 return TMR_ABORT_TASK_SET;
1940 case ISCSI_TM_FUNC_CLEAR_ACA:
1941 return TMR_CLEAR_ACA;
1942 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1943 return TMR_CLEAR_TASK_SET;
1944 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1945 return TMR_LUN_RESET;
1946 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1947 return TMR_TARGET_WARM_RESET;
1948 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1949 return TMR_TARGET_COLD_RESET;
1950 default:
1951 return TMR_UNKNOWN;
1952 }
1953}
1954
3e1c81a9
NB		 1955int
1956iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1957 unsigned char *buf)
e48354ce 1958{
e48354ce
NB		 1959 struct se_tmr_req *se_tmr;
1960 struct iscsi_tmr_req *tmr_req;
1961 struct iscsi_tm *hdr;
186a9647 1962 int out_of_order_cmdsn = 0, ret;
59b6986d 1963 u8 function, tcm_function = TMR_UNKNOWN;
e48354ce
NB		 1964
1965 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1966 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1967 function = hdr->flags;
1968
1969 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1970 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1971 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1972 hdr->rtt, hdr->refcmdsn, conn->cid);
1973
1974 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1975 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1976 hdr->rtt != RESERVED_ITT)) {
e48354ce 1977 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1978 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1979 }
1980
1981 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983 pr_err("Task Management Request TASK_REASSIGN not"
1984 " issued as immediate command, bad iSCSI Initiator"
1985 "implementation\n");
ba159914
NB		 1986 return iscsit_add_reject_cmd(cmd,
1987 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1988 }
1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1990 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1991 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1992
d28b1169 1993 cmd->data_direction = DMA_NONE;
3829f381 1994 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
ae072726 1995 if (!cmd->tmr_req) {
ba159914
NB		 1996 return iscsit_add_reject_cmd(cmd,
1997 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1998 buf);
ae072726
NB		 1999 }
2000
2001 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2002 conn->sess->se_sess, 0, DMA_NONE,
2003 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2004
53eb5c32
BVA		 2005 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0)
2006 return iscsit_add_reject_cmd(cmd,
2007 ISCSI_REASON_WAITING_FOR_LOGOUT, buf);
d28b1169
AG		 2008
2009 /*
2010 * TASK_REASSIGN for ERL=2 / connection stays inside of
2011 * LIO-Target $FABRIC_MOD
2012 */
2013 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
e381fe9e
BVA		 2014 tcm_function = iscsit_convert_tmf(function);
2015 if (tcm_function == TMR_UNKNOWN) {
d28b1169
AG		 2016 pr_err("Unknown iSCSI TMR Function:"
2017 " 0x%02x\n", function);
ba159914
NB		 2018 return iscsit_add_reject_cmd(cmd,
2019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2020 }
59b6986d
BVA		 2021 }
2022 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2023 GFP_KERNEL);
2024 if (ret < 0)
2025 return iscsit_add_reject_cmd(cmd,
ba159914 2026 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169 2027
59b6986d 2028 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
e48354ce
NB		 2029
2030 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
2031 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
2032 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2033 cmd->init_task_tag = hdr->itt;
2034 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2035 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2036 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 2037 se_tmr = cmd->se_cmd.se_tmr_req;
2038 tmr_req = cmd->tmr_req;
2039 /*
2040 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2041 */
2042 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 2043 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2044 scsilun_to_int(&hdr->lun));
e48354ce 2045 if (ret < 0) {
e48354ce
NB		 2046 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2047 goto attach;
2048 }
2049 }
2050
2051 switch (function) {
2052 case ISCSI_TM_FUNC_ABORT_TASK:
2053 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 2054 if (se_tmr->response)
e48354ce 2055 goto attach;
e48354ce
NB		 2056 break;
2057 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2058 case ISCSI_TM_FUNC_CLEAR_ACA:
2059 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2060 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2061 break;
2062 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2063 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2064 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2065 goto attach;
2066 }
2067 break;
2068 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2069 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 2070 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2071 goto attach;
2072 }
2073 break;
2074 case ISCSI_TM_FUNC_TASK_REASSIGN:
2075 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2076 /*
2077 * Perform sanity checks on the ExpDataSN only if the
2078 * TASK_REASSIGN was successful.
2079 */
de103c93 2080 if (se_tmr->response)
e48354ce
NB		 2081 break;
2082
2083 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 2084 return iscsit_add_reject_cmd(cmd,
2085 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 2086 break;
2087 default:
2088 pr_err("Unknown TMR function: 0x%02x, protocol"
2089 " error.\n", function);
e48354ce
NB		 2090 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2091 goto attach;
2092 }
2093
2094 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2095 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2096 se_tmr->call_transport = 1;
2097attach:
2098 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2099 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2100 spin_unlock_bh(&conn->cmd_lock);
2101
2102 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 2103 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
3fc9fb13 2104 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
e48354ce 2105 out_of_order_cmdsn = 1;
3fc9fb13
NB		 2106 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2107 target_put_sess_cmd(&cmd->se_cmd);
e48354ce 2108 return 0;
3fc9fb13 2109 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
ba159914 2110 return -1;
3fc9fb13 2111 }
e48354ce 2112 }
50e5c87d 2113 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 2114
5a4c8666 2115 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 2116 return 0;
2117 /*
2118 * Found the referenced task, send to transport for processing.
2119 */
2120 if (se_tmr->call_transport)
2121 return transport_generic_handle_tmr(&cmd->se_cmd);
2122
2123 /*
2124 * Could not find the referenced LUN, task, or Task Management
2125 * command not authorized or supported. Change state and
2126 * let the tx_thread send the response.
2127 *
2128 * For connection recovery, this is also the default action for
2129 * TMR TASK_REASSIGN.
2130 */
2131 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
ae072726 2132 target_put_sess_cmd(&cmd->se_cmd);
e48354ce
NB		 2133 return 0;
2134}
3e1c81a9 2135EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 2136
2137/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 2138int
2139iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2140 struct iscsi_text *hdr)
e48354ce 2141{
64534aa7 2142 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 2143
21f5aa7e 2144 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 2145 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 2146 "greater than MaxXmitDataSegmentLength %u.\n",
2147 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2149 (unsigned char *)hdr);
e48354ce
NB		 2150 }
2151
122f8afc
NB		 2152 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2153 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2154 pr_err("Multi sequence text commands currently not supported\n");
2155 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2156 (unsigned char *)hdr);
2157 }
2158
e48354ce
NB		 2159 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2160 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2161 hdr->exp_statsn, payload_length);
2162
64534aa7
NB		 2163 cmd->iscsi_opcode = ISCSI_OP_TEXT;
2164 cmd->i_state = ISTATE_SEND_TEXTRSP;
2165 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2166 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2167 cmd->targ_xfer_tag = 0xFFFFFFFF;
2168 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2169 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2170 cmd->data_direction = DMA_NONE;
ea8dc5b4 2171 kfree(cmd->text_in_ptr);
e4f4e801 2172 cmd->text_in_ptr = NULL;
64534aa7
NB		 2173
2174 return 0;
2175}
2176EXPORT_SYMBOL(iscsit_setup_text_cmd);
2177
2178int
2179iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2180 struct iscsi_text *hdr)
2181{
9864ca9d 2182 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2183 int cmdsn_ret;
2184
9864ca9d 2185 if (!text_in) {
e4f4e801
SG		 2186 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2187 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2188 pr_err("Unable to locate text_in buffer for sendtargets"
2189 " discovery\n");
2190 goto reject;
2191 }
2192 goto empty_sendtargets;
9864ca9d
NB		 2193 }
2194 if (strncmp("SendTargets", text_in, 11) != 0) {
2195 pr_err("Received Text Data that is not"
2196 " SendTargets, cannot continue.\n");
2197 goto reject;
2198 }
2199 text_ptr = strchr(text_in, '=');
2200 if (!text_ptr) {
2201 pr_err("No \"=\" separator found in Text Data,"
2202 " cannot continue.\n");
2203 goto reject;
2204 }
2205 if (!strncmp("=All", text_ptr, 4)) {
8060b8dd 2206 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
6665889c
NB		 2207 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2208 !strncmp("=eui.", text_ptr, 5)) {
8060b8dd 2209 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
9864ca9d
NB		 2210 } else {
2211 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2212 goto reject;
2213 }
2214
64534aa7
NB		 2215 spin_lock_bh(&conn->cmd_lock);
2216 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2217 spin_unlock_bh(&conn->cmd_lock);
2218
e4f4e801 2219empty_sendtargets:
64534aa7
NB		 2220 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2221
2222 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2224 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2226 return -1;
2227
64534aa7
NB		 2228 return 0;
2229 }
2230
2231 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2232
2233reject:
ba159914
NB		 2234 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2235 (unsigned char *)hdr);
64534aa7
NB		 2236}
2237EXPORT_SYMBOL(iscsit_process_text_cmd);
2238
2239static int
2240iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2241 unsigned char *buf)
2242{
2243 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2244 char *text_in = NULL;
2245 u32 payload_length = ntoh24(hdr->dlength);
2246 int rx_size, rc;
2247
2248 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2249 if (rc < 0)
561bf158 2250 return 0;
64534aa7
NB		 2251
2252 rx_size = payload_length;
2253 if (payload_length) {
64534aa7
NB		 2254 u32 checksum = 0, data_crc = 0;
2255 u32 padding = 0, pad_bytes = 0;
2256 int niov = 0, rx_got;
2257 struct kvec iov[3];
2258
2259 text_in = kzalloc(payload_length, GFP_KERNEL);
c46e22f1 2260 if (!text_in)
64534aa7 2261 goto reject;
c46e22f1 2262
9864ca9d 2263 cmd->text_in_ptr = text_in;
e48354ce
NB		 2264
2265 memset(iov, 0, 3 * sizeof(struct kvec));
2266 iov[niov].iov_base = text_in;
64534aa7 2267 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2268
2269 padding = ((-payload_length) & 3);
2270 if (padding != 0) {
76f1928e 2271 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2272 iov[niov++].iov_len = padding;
2273 rx_size += padding;
2274 pr_debug("Receiving %u additional bytes"
2275 " for padding.\n", padding);
2276 }
2277 if (conn->conn_ops->DataDigest) {
2278 iov[niov].iov_base = &checksum;
2279 iov[niov++].iov_len = ISCSI_CRC_LEN;
2280 rx_size += ISCSI_CRC_LEN;
2281 }
2282
2283 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2284 if (rx_got != rx_size)
2285 goto reject;
e48354ce
NB		 2286
2287 if (conn->conn_ops->DataDigest) {
e1dfb21f
BVA		 2288 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2289 payload_length, padding,
2290 &pad_bytes, &data_crc);
e48354ce
NB		 2291
2292 if (checksum != data_crc) {
2293 pr_err("Text data CRC32C DataDigest"
2294 " 0x%08x does not match computed"
2295 " 0x%08x\n", checksum, data_crc);
2296 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2297 pr_err("Unable to recover from"
2298 " Text Data digest failure while in"
2299 " ERL=0.\n");
64534aa7 2300 goto reject;
e48354ce
NB		 2301 } else {
2302 /*
2303 * Silently drop this PDU and let the
2304 * initiator plug the CmdSN gap.
2305 */
2306 pr_debug("Dropping Text"
2307 " Command CmdSN: 0x%08x due to"
2308 " DataCRC error.\n", hdr->cmdsn);
2309 kfree(text_in);
2310 return 0;
2311 }
2312 } else {
2313 pr_debug("Got CRC32C DataDigest"
2314 " 0x%08x for %u bytes of text data.\n",
64534aa7 2315 checksum, payload_length);
e48354ce
NB		 2316 }
2317 }
64534aa7 2318 text_in[payload_length - 1] = '\0';
e48354ce 2319 pr_debug("Successfully read %d bytes of text"
64534aa7 2320 " data.\n", payload_length);
e48354ce
NB		 2321 }
2322
64534aa7 2323 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2324
64534aa7 2325reject:
9864ca9d
NB		 2326 kfree(cmd->text_in_ptr);
2327 cmd->text_in_ptr = NULL;
ba159914 2328 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 2329}
2330
2331int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2332{
2333 struct iscsi_conn *conn_p;
2334 struct iscsi_session *sess = conn->sess;
2335
2336 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2337 " for SID: %u.\n", conn->cid, conn->sess->sid);
2338
2339 atomic_set(&sess->session_logout, 1);
2340 atomic_set(&conn->conn_logout_remove, 1);
2341 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2342
2343 iscsit_inc_conn_usage_count(conn);
2344 iscsit_inc_session_usage_count(sess);
2345
2346 spin_lock_bh(&sess->conn_lock);
2347 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2348 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2349 continue;
2350
2351 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2352 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2353 }
2354 spin_unlock_bh(&sess->conn_lock);
2355
2356 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2357
2358 return 0;
2359}
2360
2361int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2362{
2363 struct iscsi_conn *l_conn;
2364 struct iscsi_session *sess = conn->sess;
2365
2366 pr_debug("Received logout request CLOSECONNECTION for CID:"
2367 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2368
2369 /*
2370 * A Logout Request with a CLOSECONNECTION reason code for a CID
2371 * can arrive on a connection with a differing CID.
2372 */
2373 if (conn->cid == cmd->logout_cid) {
2374 spin_lock_bh(&conn->state_lock);
2375 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2376 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2377
2378 atomic_set(&conn->conn_logout_remove, 1);
2379 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2380 iscsit_inc_conn_usage_count(conn);
2381
2382 spin_unlock_bh(&conn->state_lock);
2383 } else {
2384 /*
2385 * Handle all different cid CLOSECONNECTION requests in
2386 * iscsit_logout_post_handler_diffcid() as to give enough
2387 * time for any non immediate command's CmdSN to be
2388 * acknowledged on the connection in question.
2389 *
2390 * Here we simply make sure the CID is still around.
2391 */
2392 l_conn = iscsit_get_conn_from_cid(sess,
2393 cmd->logout_cid);
2394 if (!l_conn) {
2395 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2396 iscsit_add_cmd_to_response_queue(cmd, conn,
2397 cmd->i_state);
2398 return 0;
2399 }
2400
2401 iscsit_dec_conn_usage_count(l_conn);
2402 }
2403
2404 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2405
2406 return 0;
2407}
2408
2409int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2410{
2411 struct iscsi_session *sess = conn->sess;
2412
2413 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2414 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2415
2416 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2417 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2418 " while ERL!=2.\n");
2419 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2420 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2421 return 0;
2422 }
2423
2424 if (conn->cid == cmd->logout_cid) {
2425 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2426 " with CID: %hu on CID: %hu, implementation error.\n",
2427 cmd->logout_cid, conn->cid);
2428 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2429 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430 return 0;
2431 }
2432
2433 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2434
2435 return 0;
2436}
2437
3e1c81a9
NB		 2438int
2439iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2440 unsigned char *buf)
e48354ce
NB		 2441{
2442 int cmdsn_ret, logout_remove = 0;
2443 u8 reason_code = 0;
e48354ce
NB		 2444 struct iscsi_logout *hdr;
2445 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2446
2447 hdr = (struct iscsi_logout *) buf;
2448 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2449
2450 if (tiqn) {
2451 spin_lock(&tiqn->logout_stats.lock);
2452 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2453 tiqn->logout_stats.normal_logouts++;
2454 else
2455 tiqn->logout_stats.abnormal_logouts++;
2456 spin_unlock(&tiqn->logout_stats.lock);
2457 }
2458
2459 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2460 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2461 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2462 hdr->cid, conn->cid);
2463
2464 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2465 pr_err("Received logout request on connection that"
2466 " is not in logged in state, ignoring request.\n");
aafc9d15 2467 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2468 return 0;
2469 }
2470
e48354ce
NB		 2471 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2472 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2473 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2474 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2475 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2476 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2477 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2478 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2479 cmd->logout_reason = reason_code;
2480 cmd->data_direction = DMA_NONE;
2481
2482 /*
2483 * We need to sleep in these cases (by returning 1) until the Logout
2484 * Response gets sent in the tx thread.
2485 */
2486 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2487 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2488 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2489 logout_remove = 1;
2490
2491 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2492 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2493 spin_unlock_bh(&conn->cmd_lock);
2494
2495 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2496 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2497
2498 /*
2499 * Immediate commands are executed, well, immediately.
2500 * Non-Immediate Logout Commands are executed in CmdSN order.
2501 */
c6037cc5 2502 if (cmd->immediate_cmd) {
e48354ce
NB		 2503 int ret = iscsit_execute_cmd(cmd, 0);
2504
2505 if (ret < 0)
2506 return ret;
2507 } else {
561bf158 2508 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2509 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2510 logout_remove = 0;
ba159914
NB		 2511 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2512 return -1;
e48354ce
NB		 2513 }
2514
2515 return logout_remove;
2516}
3e1c81a9 2517EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce 2518
d2faaefb 2519int iscsit_handle_snack(
e48354ce
NB		 2520 struct iscsi_conn *conn,
2521 unsigned char *buf)
2522{
e48354ce
NB		 2523 struct iscsi_snack *hdr;
2524
2525 hdr = (struct iscsi_snack *) buf;
2526 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2527
2528 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2529 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2530 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2531 hdr->begrun, hdr->runlength, conn->cid);
2532
2533 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2534 pr_err("Initiator sent SNACK request while in"
2535 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2536 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2537 buf);
e48354ce
NB		 2538 }
2539 /*
2540 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2541 * call from inside iscsi_send_recovery_datain_or_r2t().
2542 */
2543 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2544 case 0:
2545 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2546 hdr->itt,
2547 be32_to_cpu(hdr->ttt),
2548 be32_to_cpu(hdr->begrun),
2549 be32_to_cpu(hdr->runlength));
e48354ce 2550 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2551 return iscsit_handle_status_snack(conn, hdr->itt,
2552 be32_to_cpu(hdr->ttt),
2553 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2554 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2555 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2556 be32_to_cpu(hdr->begrun),
2557 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2558 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2559 /* FIXME: Support R-Data SNACK */
2560 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2561 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2562 buf);
e48354ce
NB		 2563 default:
2564 pr_err("Unknown SNACK type 0x%02x, protocol"
2565 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2566 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2567 buf);
e48354ce
NB		 2568 }
2569
2570 return 0;
2571}
d2faaefb 2572EXPORT_SYMBOL(iscsit_handle_snack);
e48354ce
NB		 2573
2574static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2575{
2576 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2577 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2578 wait_for_completion_interruptible_timeout(
2579 &conn->rx_half_close_comp,
2580 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2581 }
2582}
2583
2584static int iscsit_handle_immediate_data(
2585 struct iscsi_cmd *cmd,
3e1c81a9 2586 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2587 u32 length)
2588{
2589 int iov_ret, rx_got = 0, rx_size = 0;
2590 u32 checksum, iov_count = 0, padding = 0;
2591 struct iscsi_conn *conn = cmd->conn;
2592 struct kvec *iov;
2593
2594 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2595 if (iov_ret < 0)
2596 return IMMEDIATE_DATA_CANNOT_RECOVER;
2597
2598 rx_size = length;
2599 iov_count = iov_ret;
2600 iov = &cmd->iov_data[0];
2601
2602 padding = ((-length) & 3);
2603 if (padding != 0) {
2604 iov[iov_count].iov_base = cmd->pad_bytes;
2605 iov[iov_count++].iov_len = padding;
2606 rx_size += padding;
2607 }
2608
2609 if (conn->conn_ops->DataDigest) {
2610 iov[iov_count].iov_base = &checksum;
2611 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2612 rx_size += ISCSI_CRC_LEN;
2613 }
2614
2615 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2616
2617 iscsit_unmap_iovec(cmd);
2618
2619 if (rx_got != rx_size) {
2620 iscsit_rx_thread_wait_for_tcp(conn);
2621 return IMMEDIATE_DATA_CANNOT_RECOVER;
2622 }
2623
2624 if (conn->conn_ops->DataDigest) {
2625 u32 data_crc;
2626
69110e3c 2627 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
e48354ce
NB		 2628 cmd->write_data_done, length, padding,
2629 cmd->pad_bytes);
2630
2631 if (checksum != data_crc) {
2632 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2633 " does not match computed 0x%08x\n", checksum,
2634 data_crc);
2635
2636 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2637 pr_err("Unable to recover from"
2638 " Immediate Data digest failure while"
2639 " in ERL=0.\n");
ba159914 2640 iscsit_reject_cmd(cmd,
e48354ce 2641 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2642 (unsigned char *)hdr);
e48354ce
NB		 2643 return IMMEDIATE_DATA_CANNOT_RECOVER;
2644 } else {
ba159914 2645 iscsit_reject_cmd(cmd,
e48354ce 2646 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2647 (unsigned char *)hdr);
e48354ce
NB		 2648 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2649 }
2650 } else {
2651 pr_debug("Got CRC32C DataDigest 0x%08x for"
2652 " %u bytes of Immediate Data\n", checksum,
2653 length);
2654 }
2655 }
2656
2657 cmd->write_data_done += length;
2658
ebf1d95c 2659 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2660 spin_lock_bh(&cmd->istate_lock);
2661 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2662 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2663 spin_unlock_bh(&cmd->istate_lock);
2664 }
2665
2666 return IMMEDIATE_DATA_NORMAL_OPERATION;
2667}
2668
2669/*
2670 * Called with sess->conn_lock held.
2671 */
2672/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2673 with active network interface */
2674static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2675{
2676 struct iscsi_cmd *cmd;
2677 struct iscsi_conn *conn_p;
d444edc6 2678 bool found = false;
e48354ce
NB		 2679
2680 /*
2681 * Only send a Asynchronous Message on connections whos network
2682 * interface is still functional.
2683 */
2684 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2685 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2686 iscsit_inc_conn_usage_count(conn_p);
d444edc6 2687 found = true;
e48354ce
NB		 2688 break;
2689 }
2690 }
2691
d444edc6 2692 if (!found)
e48354ce
NB		 2693 return;
2694
676687c6 2695 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2696 if (!cmd) {
2697 iscsit_dec_conn_usage_count(conn_p);
2698 return;
2699 }
2700
2701 cmd->logout_cid = conn->cid;
2702 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2703 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2704
2705 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2706 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2707 spin_unlock_bh(&conn_p->cmd_lock);
2708
2709 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2710 iscsit_dec_conn_usage_count(conn_p);
2711}
2712
2713static int iscsit_send_conn_drop_async_message(
2714 struct iscsi_cmd *cmd,
2715 struct iscsi_conn *conn)
2716{
2717 struct iscsi_async *hdr;
2718
e48354ce
NB		 2719 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2720
2721 hdr = (struct iscsi_async *) cmd->pdu;
2722 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2723 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2724 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2725 cmd->targ_xfer_tag = 0xFFFFFFFF;
2726 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2727 cmd->stat_sn = conn->stat_sn++;
2728 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2729 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2730 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 2731 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2732 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2733 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2734 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2735
e48354ce
NB		 2736 pr_debug("Sending Connection Dropped Async Message StatSN:"
2737 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2738 cmd->logout_cid, conn->cid);
2854bb23
VP		 2739
2740 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2741}
2742
6f3c0e69
AG		 2743static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2744{
2745 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2746 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2747 wait_for_completion_interruptible_timeout(
2748 &conn->tx_half_close_comp,
2749 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2750 }
2751}
2752
d2faaefb 2753void
2ec5a8c1
NB		 2754iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2755 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2756 bool set_statsn)
e48354ce 2757{
2ec5a8c1
NB		 2758 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2759 hdr->flags = datain->flags;
2760 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2761 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2762 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2763 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2764 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2765 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2766 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2767 }
2768 }
2769 hton24(hdr->dlength, datain->length);
2770 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2771 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2772 (struct scsi_lun *)&hdr->lun);
2773 else
2774 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2775
2776 hdr->itt = cmd->init_task_tag;
2777
2778 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2779 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2780 else
2781 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2782 if (set_statsn)
2783 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2784 else
2785 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2786
2787 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2788 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2789 hdr->datasn = cpu_to_be32(datain->data_sn);
2790 hdr->offset = cpu_to_be32(datain->offset);
2791
2792 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2793 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2794 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2795 ntohl(hdr->offset), datain->length, conn->cid);
2796}
d2faaefb 2797EXPORT_SYMBOL(iscsit_build_datain_pdu);
2ec5a8c1
NB		 2798
2799static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2800{
2801 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2802 struct iscsi_datain datain;
2803 struct iscsi_datain_req *dr;
2854bb23 2804 int eodr = 0, ret;
2ec5a8c1 2805 bool set_statsn = false;
e48354ce
NB		 2806
2807 memset(&datain, 0, sizeof(struct iscsi_datain));
2808 dr = iscsit_get_datain_values(cmd, &datain);
2809 if (!dr) {
2810 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2811 cmd->init_task_tag);
2812 return -1;
2813 }
e48354ce
NB		 2814 /*
2815 * Be paranoid and double check the logic for now.
2816 */
ebf1d95c 2817 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2818 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2819 " datain.length: %u exceeds cmd->data_length: %u\n",
2820 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2821 cmd->se_cmd.data_length);
e48354ce
NB		 2822 return -1;
2823 }
2824
04f3b31b 2825 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2826 /*
2827 * Special case for successfully execution w/ both DATAIN
2828 * and Sense Data.
2829 */
2830 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2831 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2832 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2833 else {
2834 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2835 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2836 iscsit_increment_maxcmdsn(cmd, conn->sess);
2837 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2838 set_statsn = true;
e48354ce 2839 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2840 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2841 set_statsn = true;
e48354ce
NB		 2842 }
2843
2ec5a8c1 2844 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce 2845
2854bb23
VP		 2846 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2847 if (ret < 0)
6f3c0e69 2848 return ret;
6f3c0e69 2849
e48354ce 2850 if (dr->dr_complete) {
6f3c0e69 2851 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2852 2 : 1;
2853 iscsit_free_datain_req(cmd, dr);
2854 }
2855
6f3c0e69 2856 return eodr;
e48354ce
NB		 2857}
2858
2ec5a8c1
NB		 2859int
2860iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2861 struct iscsi_logout_rsp *hdr)
e48354ce 2862{
e48354ce
NB		 2863 struct iscsi_conn *logout_conn = NULL;
2864 struct iscsi_conn_recovery *cr = NULL;
2865 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2866 /*
2867 * The actual shutting down of Sessions and/or Connections
2868 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2869 * is done in scsi_logout_post_handler().
2870 */
2871 switch (cmd->logout_reason) {
2872 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2873 pr_debug("iSCSI session logout successful, setting"
2874 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2875 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2876 break;
2877 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2878 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2879 break;
2880 /*
2881 * For CLOSECONNECTION logout requests carrying
2882 * a matching logout CID -> local CID, the reference
2883 * for the local CID will have been incremented in
2884 * iscsi_logout_closeconnection().
2885 *
2886 * For CLOSECONNECTION logout requests carrying
2887 * a different CID than the connection it arrived
2888 * on, the connection responding to cmd->logout_cid
2889 * is stopped in iscsit_logout_post_handler_diffcid().
2890 */
2891
2892 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2893 " successful.\n", cmd->logout_cid, conn->cid);
2894 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2895 break;
2896 case ISCSI_LOGOUT_REASON_RECOVERY:
2897 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2898 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2899 break;
2900 /*
2901 * If the connection is still active from our point of view
2902 * force connection recovery to occur.
2903 */
2904 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2905 cmd->logout_cid);
ee1b1b9c 2906 if (logout_conn) {
e48354ce
NB		 2907 iscsit_connection_reinstatement_rcfr(logout_conn);
2908 iscsit_dec_conn_usage_count(logout_conn);
2909 }
2910
2911 cr = iscsit_get_inactive_connection_recovery_entry(
2912 conn->sess, cmd->logout_cid);
2913 if (!cr) {
2914 pr_err("Unable to locate CID: %hu for"
2915 " REMOVECONNFORRECOVERY Logout Request.\n",
2916 cmd->logout_cid);
2917 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2918 break;
2919 }
2920
2921 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2922
2923 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2924 " for recovery for CID: %hu on CID: %hu successful.\n",
2925 cmd->logout_cid, conn->cid);
2926 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2927 break;
2928 default:
2929 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2930 cmd->logout_reason);
2931 return -1;
2932 }
2933
e48354ce
NB		 2934 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2935 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2936 hdr->response = cmd->logout_response;
66c7db68 2937 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2938 cmd->stat_sn = conn->stat_sn++;
2939 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2940
2941 iscsit_increment_maxcmdsn(cmd, conn->sess);
2942 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2943 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 2944
2ec5a8c1
NB		 2945 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2946 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2947 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2948 cmd->logout_cid, conn->cid);
2949
2950 return 0;
2951}
2952EXPORT_SYMBOL(iscsit_build_logout_rsp);
2953
2954static int
2955iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2956{
2854bb23 2957 int rc;
2ec5a8c1
NB		 2958
2959 rc = iscsit_build_logout_rsp(cmd, conn,
2960 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2961 if (rc < 0)
2962 return rc;
2963
2854bb23 2964 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 2965}
2966
2ec5a8c1
NB		 2967void
2968iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2969 struct iscsi_nopin *hdr, bool nopout_response)
2970{
2971 hdr->opcode = ISCSI_OP_NOOP_IN;
2972 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2973 hton24(hdr->dlength, cmd->buf_ptr_size);
2974 if (nopout_response)
2975 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2976 hdr->itt = cmd->init_task_tag;
2977 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2978 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2979 conn->stat_sn;
2980 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2981
2982 if (nopout_response)
2983 iscsit_increment_maxcmdsn(cmd, conn->sess);
2984
2985 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 2986 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 2987
2988 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2989 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3fc6a642 2990 "Solicited" : "Unsolicited", cmd->init_task_tag,
2ec5a8c1
NB		 2991 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2992}
2993EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2994
e48354ce
NB		 2995/*
2996 * Unsolicited NOPIN, either requesting a response or not.
2997 */
2998static int iscsit_send_unsolicited_nopin(
2999 struct iscsi_cmd *cmd,
3000 struct iscsi_conn *conn,
3001 int want_response)
3002{
2ec5a8c1 3003 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2854bb23 3004 int ret;
e48354ce 3005
2ec5a8c1 3006 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce 3007
e48354ce
NB		 3008 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3009 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3010
2854bb23
VP		 3011 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3012 if (ret < 0)
6f3c0e69 3013 return ret;
6f3c0e69
AG		 3014
3015 spin_lock_bh(&cmd->istate_lock);
3016 cmd->i_state = want_response ?
3017 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3018 spin_unlock_bh(&cmd->istate_lock);
3019
e48354ce
NB		 3020 return 0;
3021}
3022
2ec5a8c1
NB		 3023static int
3024iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 3025{
2ec5a8c1 3026 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 3027
2ec5a8c1 3028 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 3029
e48354ce
NB		 3030 /*
3031 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3032 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3033 */
2854bb23 3034 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
e48354ce 3035
2854bb23
VP		 3036 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3037 cmd->buf_ptr,
3038 cmd->buf_ptr_size);
e48354ce
NB		 3039}
3040
6f3c0e69 3041static int iscsit_send_r2t(
e48354ce
NB		 3042 struct iscsi_cmd *cmd,
3043 struct iscsi_conn *conn)
3044{
e48354ce
NB		 3045 struct iscsi_r2t *r2t;
3046 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3047 int ret;
e48354ce
NB		 3048
3049 r2t = iscsit_get_r2t_from_list(cmd);
3050 if (!r2t)
3051 return -1;
3052
3053 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3054 memset(hdr, 0, ISCSI_HDR_LEN);
3055 hdr->opcode = ISCSI_OP_R2T;
3056 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3057 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3058 (struct scsi_lun *)&hdr->lun);
66c7db68 3059 hdr->itt = cmd->init_task_tag;
8567270d
VP		 3060 if (conn->conn_transport->iscsit_get_r2t_ttt)
3061 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3062 else
3063 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
e48354ce
NB		 3064 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3065 hdr->statsn = cpu_to_be32(conn->stat_sn);
3066 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3067 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce
NB		 3068 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3069 hdr->data_offset = cpu_to_be32(r2t->offset);
3070 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3071
e48354ce
NB		 3072 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3073 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3074 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3075 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3076 r2t->offset, r2t->xfer_len, conn->cid);
3077
e48354ce
NB		 3078 spin_lock_bh(&cmd->r2t_lock);
3079 r2t->sent_r2t = 1;
3080 spin_unlock_bh(&cmd->r2t_lock);
3081
2854bb23 3082 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
6f3c0e69 3083 if (ret < 0) {
6f3c0e69
AG		 3084 return ret;
3085 }
3086
3087 spin_lock_bh(&cmd->dataout_timeout_lock);
3088 iscsit_start_dataout_timer(cmd, conn);
3089 spin_unlock_bh(&cmd->dataout_timeout_lock);
3090
e48354ce
NB		 3091 return 0;
3092}
3093
3094/*
8b1e1244
AG		 3095 * @recovery: If called from iscsi_task_reassign_complete_write() for
3096 * connection recovery.
e48354ce
NB		 3097 */
3098int iscsit_build_r2ts_for_cmd(
e48354ce 3099 struct iscsi_conn *conn,
3e1c81a9 3100 struct iscsi_cmd *cmd,
8b1e1244 3101 bool recovery)
e48354ce
NB		 3102{
3103 int first_r2t = 1;
3104 u32 offset = 0, xfer_len = 0;
3105
3106 spin_lock_bh(&cmd->r2t_lock);
3107 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3108 spin_unlock_bh(&cmd->r2t_lock);
3109 return 0;
3110 }
3111
8b1e1244
AG		 3112 if (conn->sess->sess_ops->DataSequenceInOrder &&
3113 !recovery)
c6037cc5 3114 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3115
3116 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3117 if (conn->sess->sess_ops->DataSequenceInOrder) {
3118 offset = cmd->r2t_offset;
3119
8b1e1244
AG		 3120 if (first_r2t && recovery) {
3121 int new_data_end = offset +
3122 conn->sess->sess_ops->MaxBurstLength -
3123 cmd->next_burst_len;
3124
ebf1d95c
AG		 3125 if (new_data_end > cmd->se_cmd.data_length)
3126 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3127 else
3128 xfer_len =
3129 conn->sess->sess_ops->MaxBurstLength -
3130 cmd->next_burst_len;
e48354ce 3131 } else {
8b1e1244
AG		 3132 int new_data_end = offset +
3133 conn->sess->sess_ops->MaxBurstLength;
3134
ebf1d95c
AG		 3135 if (new_data_end > cmd->se_cmd.data_length)
3136 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3137 else
3138 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3139 }
3140 cmd->r2t_offset += xfer_len;
3141
ebf1d95c 3142 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3143 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3144 } else {
3145 struct iscsi_seq *seq;
3146
3147 seq = iscsit_get_seq_holder_for_r2t(cmd);
3148 if (!seq) {
3149 spin_unlock_bh(&cmd->r2t_lock);
3150 return -1;
3151 }
3152
3153 offset = seq->offset;
3154 xfer_len = seq->xfer_len;
3155
3156 if (cmd->seq_send_order == cmd->seq_count)
3157 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3158 }
3159 cmd->outstanding_r2ts++;
3160 first_r2t = 0;
3161
3162 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3163 spin_unlock_bh(&cmd->r2t_lock);
3164 return -1;
3165 }
3166
3167 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3168 break;
3169 }
3170 spin_unlock_bh(&cmd->r2t_lock);
3171
3172 return 0;
3173}
d2faaefb 3174EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
e48354ce 3175
2ec5a8c1
NB		 3176void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3177 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
e48354ce 3178{
2ec5a8c1 3179 if (inc_stat_sn)
e48354ce
NB		 3180 cmd->stat_sn = conn->stat_sn++;
3181
04f3b31b 3182 atomic_long_inc(&conn->sess->rsp_pdus);
e48354ce 3183
e48354ce
NB		 3184 memset(hdr, 0, ISCSI_HDR_LEN);
3185 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP;
3186 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3187 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3188 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
7e46cf02 3189 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3190 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3191 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
7e46cf02 3192 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
e48354ce
NB		 3193 }
3194 hdr->response = cmd->iscsi_response;
3195 hdr->cmd_status = cmd->se_cmd.scsi_status;
66c7db68 3196 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3197 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3198
3199 iscsit_increment_maxcmdsn(cmd, conn->sess);
3200 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3201 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3202
2ec5a8c1
NB		 3203 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3204 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3205 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3206 cmd->se_cmd.scsi_status, conn->cid);
3207}
3208EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3209
3210static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3211{
3212 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
2ec5a8c1 3213 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
2854bb23
VP		 3214 void *data_buf = NULL;
3215 u32 padding = 0, data_buf_len = 0;
2ec5a8c1
NB		 3216
3217 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3218
e48354ce
NB		 3219 /*
3220 * Attach SENSE DATA payload to iSCSI Response PDU
3221 */
3222 if (cmd->se_cmd.sense_buffer &&
3223 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3224 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3225 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3226 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3227
e48354ce 3228 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3229 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2854bb23
VP		 3230 data_buf = cmd->sense_buffer;
3231 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
e48354ce
NB		 3232
3233 if (padding) {
9c58b7dd 3234 memset(cmd->sense_buffer +
e48354ce 3235 cmd->se_cmd.scsi_sense_length, 0, padding);
e48354ce
NB		 3236 pr_debug("Adding %u bytes of padding to"
3237 " SENSE.\n", padding);
3238 }
3239
e48354ce
NB		 3240 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3241 " Response PDU\n",
3242 cmd->se_cmd.scsi_sense_length);
3243 }
3244
2854bb23
VP		 3245 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3246 data_buf_len);
e48354ce
NB		 3247}
3248
3249static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3250{
3251 switch (se_tmr->response) {
3252 case TMR_FUNCTION_COMPLETE:
3253 return ISCSI_TMF_RSP_COMPLETE;
3254 case TMR_TASK_DOES_NOT_EXIST:
3255 return ISCSI_TMF_RSP_NO_TASK;
3256 case TMR_LUN_DOES_NOT_EXIST:
3257 return ISCSI_TMF_RSP_NO_LUN;
3258 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3259 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3260 case TMR_FUNCTION_REJECTED:
3261 default:
3262 return ISCSI_TMF_RSP_REJECTED;
3263 }
3264}
3265
2ec5a8c1
NB		 3266void
3267iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3268 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3269{
3270 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3271
e48354ce 3272 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3273 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3274 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3275 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3276 cmd->stat_sn = conn->stat_sn++;
3277 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3278
3279 iscsit_increment_maxcmdsn(cmd, conn->sess);
3280 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3281 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3282
2ec5a8c1
NB		 3283 pr_debug("Built Task Management Response ITT: 0x%08x,"
3284 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3285 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3286}
3287EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3288
3289static int
3290iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3291{
3292 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
2ec5a8c1
NB		 3293
3294 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3295
2854bb23 3296 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
e48354ce
NB		 3297}
3298
2f9bc894
NB		 3299static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3300{
3301 bool ret = false;
3302
3303 if (np->np_sockaddr.ss_family == AF_INET6) {
3304 const struct sockaddr_in6 sin6 = {
3305 .sin6_addr = IN6ADDR_ANY_INIT };
3306 struct sockaddr_in6 *sock_in6 =
3307 (struct sockaddr_in6 *)&np->np_sockaddr;
3308
3309 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3310 sin6.sin6_addr.s6_addr, 16))
3311 ret = true;
3312 } else {
3313 struct sockaddr_in * sock_in =
3314 (struct sockaddr_in *)&np->np_sockaddr;
3315
cea0b4ce 3316 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3317 ret = true;
3318 }
3319
3320 return ret;
3321}
3322
8b1e1244
AG		 3323#define SENDTARGETS_BUF_LIMIT 32768U
3324
22c7aaa5
SG		 3325static int
3326iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
e4f4e801
SG		 3327 enum iscsit_transport_type network_transport,
3328 int skip_bytes, bool *completed)
e48354ce
NB		 3329{
3330 char *payload = NULL;
3331 struct iscsi_conn *conn = cmd->conn;
3332 struct iscsi_portal_group *tpg;
3333 struct iscsi_tiqn *tiqn;
3334 struct iscsi_tpg_np *tpg_np;
3335 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3336 int target_name_printed;
8b1e1244 3337 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3338 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
a6415cdd 3339 bool active;
e48354ce 3340
be7dcfb6 3341 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
8b1e1244 3342 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3343
3344 payload = kzalloc(buffer_len, GFP_KERNEL);
c46e22f1 3345 if (!payload)
e48354ce 3346 return -ENOMEM;
c46e22f1 3347
6665889c 3348 /*
8060b8dd 3349 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
6665889c
NB		 3350 * explicit case..
3351 */
8060b8dd 3352 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
6665889c
NB		 3353 text_ptr = strchr(text_in, '=');
3354 if (!text_ptr) {
3355 pr_err("Unable to locate '=' string in text_in:"
3356 " %s\n", text_in);
4f45d320 3357 kfree(payload);
6665889c
NB		 3358 return -EINVAL;
3359 }
3360 /*
3361 * Skip over '=' character..
3362 */
3363 text_ptr += 1;
3364 }
e48354ce
NB		 3365
3366 spin_lock(&tiqn_lock);
3367 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
8060b8dd 3368 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
6665889c
NB		 3369 strcmp(tiqn->tiqn, text_ptr)) {
3370 continue;
3371 }
3372
2dd1d53f 3373 target_name_printed = 0;
e48354ce
NB		 3374
3375 spin_lock(&tiqn->tiqn_tpg_lock);
3376 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3377
2dd1d53f
TG		 3378 /* If demo_mode_discovery=0 and generate_node_acls=0
3379 * (demo mode dislabed) do not return
3380 * TargetName+TargetAddress unless a NodeACL exists.
3381 */
3382
3383 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3384 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
21aaa23b 3385 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
2dd1d53f
TG		 3386 cmd->conn->sess->sess_ops->InitiatorName))) {
3387 continue;
3388 }
3389
e48354ce 3390 spin_lock(&tpg->tpg_state_lock);
a6415cdd 3391 active = (tpg->tpg_state == TPG_STATE_ACTIVE);
e48354ce
NB		 3392 spin_unlock(&tpg->tpg_state_lock);
3393
a6415cdd
DD		 3394 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3395 continue;
3396
e48354ce
NB		 3397 spin_lock(&tpg->tpg_np_lock);
3398 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3399 tpg_np_list) {
2f9bc894
NB		 3400 struct iscsi_np *np = tpg_np->tpg_np;
3401 bool inaddr_any = iscsit_check_inaddr_any(np);
13a3cf08 3402 struct sockaddr_storage *sockaddr;
2f9bc894 3403
22c7aaa5
SG		 3404 if (np->np_network_transport != network_transport)
3405 continue;
3406
2dd1d53f
TG		 3407 if (!target_name_printed) {
3408 len = sprintf(buf, "TargetName=%s",
3409 tiqn->tiqn);
3410 len += 1;
3411
3412 if ((len + payload_len) > buffer_len) {
3413 spin_unlock(&tpg->tpg_np_lock);
3414 spin_unlock(&tiqn->tiqn_tpg_lock);
3415 end_of_buf = 1;
3416 goto eob;
3417 }
e4f4e801
SG		 3418
3419 if (skip_bytes && len <= skip_bytes) {
3420 skip_bytes -= len;
3421 } else {
3422 memcpy(payload + payload_len, buf, len);
3423 payload_len += len;
3424 target_name_printed = 1;
3425 if (len > skip_bytes)
3426 skip_bytes = 0;
3427 }
2dd1d53f
TG		 3428 }
3429
69d75574
AG		 3430 if (inaddr_any)
3431 sockaddr = &conn->local_sockaddr;
1997e625 3432 else
69d75574 3433 sockaddr = &np->np_sockaddr;
1997e625 3434
69d75574
AG		 3435 len = sprintf(buf, "TargetAddress="
3436 "%pISpc,%hu",
3437 sockaddr,
3438 tpg->tpgt);
e48354ce
NB		 3439 len += 1;
3440
3441 if ((len + payload_len) > buffer_len) {
3442 spin_unlock(&tpg->tpg_np_lock);
3443 spin_unlock(&tiqn->tiqn_tpg_lock);
3444 end_of_buf = 1;
3445 goto eob;
3446 }
e4f4e801
SG		 3447
3448 if (skip_bytes && len <= skip_bytes) {
3449 skip_bytes -= len;
3450 } else {
3451 memcpy(payload + payload_len, buf, len);
3452 payload_len += len;
3453 if (len > skip_bytes)
3454 skip_bytes = 0;
3455 }
e48354ce
NB		 3456 }
3457 spin_unlock(&tpg->tpg_np_lock);
3458 }
3459 spin_unlock(&tiqn->tiqn_tpg_lock);
3460eob:
e4f4e801
SG		 3461 if (end_of_buf) {
3462 *completed = false;
e48354ce 3463 break;
e4f4e801 3464 }
6665889c 3465
8060b8dd 3466 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
6665889c 3467 break;
e48354ce
NB		 3468 }
3469 spin_unlock(&tiqn_lock);
3470
3471 cmd->buf_ptr = payload;
3472
3473 return payload_len;
3474}
3475
889c8a68
NB		 3476int
3477iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
22c7aaa5
SG		 3478 struct iscsi_text_rsp *hdr,
3479 enum iscsit_transport_type network_transport)
e48354ce 3480{
889c8a68 3481 int text_length, padding;
e4f4e801 3482 bool completed = true;
e48354ce 3483
e4f4e801
SG		 3484 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3485 cmd->read_data_done,
3486 &completed);
e48354ce
NB		 3487 if (text_length < 0)
3488 return text_length;
3489
e4f4e801 3490 if (completed) {
310d40a9 3491 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e4f4e801 3492 } else {
310d40a9 3493 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
e4f4e801
SG		 3494 cmd->read_data_done += text_length;
3495 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3496 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3497 }
889c8a68 3498 hdr->opcode = ISCSI_OP_TEXT_RSP;
e48354ce 3499 padding = ((-text_length) & 3);
e48354ce 3500 hton24(hdr->dlength, text_length);
889c8a68
NB		 3501 hdr->itt = cmd->init_task_tag;
3502 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3503 cmd->stat_sn = conn->stat_sn++;
3504 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3505
3506 iscsit_increment_maxcmdsn(cmd, conn->sess);
e4f4e801
SG		 3507 /*
3508 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3509 * correctly increment MaxCmdSN for each response answering a
3510 * non immediate text request with a valid CmdSN.
3511 */
3512 cmd->maxcmdsn_inc = 0;
889c8a68 3513 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3514 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
e48354ce 3515
e4f4e801
SG		 3516 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3517 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3518 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3519 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3520 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
889c8a68
NB		 3521
3522 return text_length + padding;
3523}
3524EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3525
889c8a68
NB		 3526static int iscsit_send_text_rsp(
3527 struct iscsi_cmd *cmd,
3528 struct iscsi_conn *conn)
3529{
3530 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
2854bb23 3531 int text_length;
e48354ce 3532
864e504a
VP		 3533 text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3534 conn->conn_transport->transport_type);
2854bb23
VP		 3535 if (text_length < 0)
3536 return text_length;
e48354ce 3537
2854bb23
VP		 3538 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3539 cmd->buf_ptr,
3540 text_length);
e48354ce
NB		 3541}
3542
2ec5a8c1
NB		 3543void
3544iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3545 struct iscsi_reject *hdr)
3546{
3547 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3548 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3549 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3550 hton24(hdr->dlength, ISCSI_HDR_LEN);
3551 hdr->ffffffff = cpu_to_be32(0xffffffff);
3552 cmd->stat_sn = conn->stat_sn++;
3553 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3554 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
109e2381 3555 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2ec5a8c1
NB		 3556
3557}
3558EXPORT_SYMBOL(iscsit_build_reject);
3559
e48354ce
NB		 3560static int iscsit_send_reject(
3561 struct iscsi_cmd *cmd,
3562 struct iscsi_conn *conn)
3563{
bfbdb31d 3564 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3565
bfbdb31d 3566 iscsit_build_reject(cmd, conn, hdr);
e48354ce 3567
e48354ce
NB		 3568 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3569 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3570
2854bb23
VP		 3571 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3572 cmd->buf_ptr,
3573 ISCSI_HDR_LEN);
e48354ce
NB		 3574}
3575
e48354ce
NB		 3576void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3577{
e48354ce
NB		 3578 int ord, cpu;
3579 /*
88dcd2da
NB		 3580 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3581 * within iscsit_start_kthreads()
e48354ce 3582 *
88dcd2da
NB		 3583 * Here we use bitmap_id to determine which CPU that this
3584 * iSCSI connection's RX/TX threads will be scheduled to
e48354ce
NB		 3585 * execute upon.
3586 */
88dcd2da 3587 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3588 for_each_online_cpu(cpu) {
3589 if (ord-- == 0) {
3590 cpumask_set_cpu(cpu, conn->conn_cpumask);
3591 return;
3592 }
3593 }
3594 /*
3595 * This should never be reached..
3596 */
3597 dump_stack();
3598 cpumask_setall(conn->conn_cpumask);
3599}
3600
d2faaefb 3601int
2ec5a8c1 3602iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3603{
6f3c0e69
AG		 3604 int ret;
3605
2ec5a8c1
NB		 3606 switch (state) {
3607 case ISTATE_SEND_R2T:
3608 ret = iscsit_send_r2t(cmd, conn);
3609 if (ret < 0)
3610 goto err;
3611 break;
3612 case ISTATE_REMOVE:
3613 spin_lock_bh(&conn->cmd_lock);
5159d763 3614 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3615 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3616
aafc9d15 3617 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3618 break;
3619 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3620 iscsit_mod_nopin_response_timer(conn);
3621 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3622 if (ret < 0)
6f3c0e69 3623 goto err;
2ec5a8c1
NB		 3624 break;
3625 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3626 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3627 if (ret < 0)
3628 goto err;
3629 break;
3630 default:
3631 pr_err("Unknown Opcode: 0x%02x ITT:"
3632 " 0x%08x, i_state: %d on CID: %hu\n",
3633 cmd->iscsi_opcode, cmd->init_task_tag, state,
3634 conn->cid);
3635 goto err;
6f3c0e69
AG		 3636 }
3637
3638 return 0;
3639
3640err:
3641 return -1;
3642}
d2faaefb 3643EXPORT_SYMBOL(iscsit_immediate_queue);
6f3c0e69 3644
2ec5a8c1
NB		 3645static int
3646iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3647{
2ec5a8c1 3648 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3649 struct iscsi_queue_req *qr;
3650 struct iscsi_cmd *cmd;
3651 u8 state;
3652 int ret;
3653
2ec5a8c1
NB		 3654 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3655 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3656 cmd = qr->cmd;
3657 state = qr->state;
3658 kmem_cache_free(lio_qr_cache, qr);
3659
2ec5a8c1
NB		 3660 ret = t->iscsit_immediate_queue(conn, cmd, state);
3661 if (ret < 0)
3662 return ret;
3663 }
fd3a9025 3664
2ec5a8c1
NB		 3665 return 0;
3666}
6f3c0e69 3667
d2faaefb 3668int
2ec5a8c1
NB		 3669iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3670{
3671 int ret;
3672
3673check_rsp_state:
3674 switch (state) {
3675 case ISTATE_SEND_DATAIN:
3676 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3677 if (ret < 0)
3678 goto err;
2ec5a8c1
NB		 3679 else if (!ret)
3680 /* more drs */
3681 goto check_rsp_state;
3682 else if (ret == 1) {
3683 /* all done */
3684 spin_lock_bh(&cmd->istate_lock);
3685 cmd->i_state = ISTATE_SENT_STATUS;
3686 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3687
2ec5a8c1
NB		 3688 if (atomic_read(&conn->check_immediate_queue))
3689 return 1;
6f3c0e69 3690
2ec5a8c1
NB		 3691 return 0;
3692 } else if (ret == 2) {
3693 /* Still must send status,
3694 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3695 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3696 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3697 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3698 state = ISTATE_SEND_STATUS;
3699 goto check_rsp_state;
3700 }
3701
3702 break;
3703 case ISTATE_SEND_STATUS:
3704 case ISTATE_SEND_STATUS_RECOVERY:
3705 ret = iscsit_send_response(cmd, conn);
3706 break;
3707 case ISTATE_SEND_LOGOUTRSP:
3708 ret = iscsit_send_logout(cmd, conn);
3709 break;
3710 case ISTATE_SEND_ASYNCMSG:
3711 ret = iscsit_send_conn_drop_async_message(
3712 cmd, conn);
3713 break;
3714 case ISTATE_SEND_NOPIN:
3715 ret = iscsit_send_nopin(cmd, conn);
3716 break;
3717 case ISTATE_SEND_REJECT:
3718 ret = iscsit_send_reject(cmd, conn);
3719 break;
3720 case ISTATE_SEND_TASKMGTRSP:
3721 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3722 if (ret != 0)
6f3c0e69 3723 break;
2ec5a8c1
NB		 3724 ret = iscsit_tmr_post_handler(cmd, conn);
3725 if (ret != 0)
3726 iscsit_fall_back_to_erl0(conn->sess);
3727 break;
3728 case ISTATE_SEND_TEXTRSP:
3729 ret = iscsit_send_text_rsp(cmd, conn);
3730 break;
3731 default:
3732 pr_err("Unknown Opcode: 0x%02x ITT:"
3733 " 0x%08x, i_state: %d on CID: %hu\n",
3734 cmd->iscsi_opcode, cmd->init_task_tag,
3735 state, conn->cid);
3736 goto err;
3737 }
3738 if (ret < 0)
3739 goto err;
3740
2ec5a8c1
NB		 3741 switch (state) {
3742 case ISTATE_SEND_LOGOUTRSP:
3743 if (!iscsit_logout_post_handler(cmd, conn))
88dcd2da 3744 return -ECONNRESET;
2ec5a8c1
NB		 3745 /* fall through */
3746 case ISTATE_SEND_STATUS:
3747 case ISTATE_SEND_ASYNCMSG:
3748 case ISTATE_SEND_NOPIN:
3749 case ISTATE_SEND_STATUS_RECOVERY:
3750 case ISTATE_SEND_TEXTRSP:
3751 case ISTATE_SEND_TASKMGTRSP:
ba159914 3752 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3753 spin_lock_bh(&cmd->istate_lock);
3754 cmd->i_state = ISTATE_SENT_STATUS;
3755 spin_unlock_bh(&cmd->istate_lock);
3756 break;
2ec5a8c1
NB		 3757 default:
3758 pr_err("Unknown Opcode: 0x%02x ITT:"
3759 " 0x%08x, i_state: %d on CID: %hu\n",
3760 cmd->iscsi_opcode, cmd->init_task_tag,
3761 cmd->i_state, conn->cid);
3762 goto err;
6f3c0e69
AG		 3763 }
3764
2ec5a8c1
NB		 3765 if (atomic_read(&conn->check_immediate_queue))
3766 return 1;
3767
6f3c0e69
AG		 3768 return 0;
3769
3770err:
3771 return -1;
6f3c0e69 3772}
d2faaefb 3773EXPORT_SYMBOL(iscsit_response_queue);
6f3c0e69 3774
2ec5a8c1
NB		 3775static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3776{
3777 struct iscsit_transport *t = conn->conn_transport;
3778 struct iscsi_queue_req *qr;
3779 struct iscsi_cmd *cmd;
3780 u8 state;
3781 int ret;
3782
3783 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3784 cmd = qr->cmd;
3785 state = qr->state;
3786 kmem_cache_free(lio_qr_cache, qr);
3787
3788 ret = t->iscsit_response_queue(conn, cmd, state);
3789 if (ret == 1 || ret < 0)
3790 return ret;
3791 }
3792
3793 return 0;
3794}
3795
6f3c0e69
AG		 3796int iscsi_target_tx_thread(void *arg)
3797{
e48354ce 3798 int ret = 0;
88dcd2da 3799 struct iscsi_conn *conn = arg;
5e0cf5e6
JY		 3800 bool conn_freed = false;
3801
e48354ce
NB		 3802 /*
3803 * Allow ourselves to be interrupted by SIGINT so that a
3804 * connection recovery / failure event can be triggered externally.
3805 */
3806 allow_signal(SIGINT);
3807
e48354ce
NB		 3808 while (!kthread_should_stop()) {
3809 /*
3810 * Ensure that both TX and RX per connection kthreads
3811 * are scheduled to run on the same CPU.
3812 */
3813 iscsit_thread_check_cpumask(conn, current, 1);
3814
d5627acb 3815 wait_event_interruptible(conn->queues_wq,
88dcd2da 3816 !iscsit_conn_all_queues_empty(conn));
e48354ce 3817
88dcd2da 3818 if (signal_pending(current))
e48354ce
NB		 3819 goto transport_err;
3820
fd3a9025 3821get_immediate:
2ec5a8c1 3822 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3823 if (ret < 0)
3824 goto transport_err;
e48354ce 3825
2ec5a8c1 3826 ret = iscsit_handle_response_queue(conn);
5e0cf5e6 3827 if (ret == 1) {
fd3a9025 3828 goto get_immediate;
5e0cf5e6
JY		 3829 } else if (ret == -ECONNRESET) {
3830 conn_freed = true;
88dcd2da 3831 goto out;
5e0cf5e6 3832 } else if (ret < 0) {
6f3c0e69 3833 goto transport_err;
5e0cf5e6 3834 }
e48354ce
NB		 3835 }
3836
3837transport_err:
e5419865
NB		 3838 /*
3839 * Avoid the normal connection failure code-path if this connection
3840 * is still within LOGIN mode, and iscsi_np process context is
3841 * responsible for cleaning up the early connection failure.
3842 */
3843 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
5e0cf5e6 3844 iscsit_take_action_for_connection_exit(conn, &conn_freed);
e48354ce 3845out:
5e0cf5e6
JY		 3846 if (!conn_freed) {
3847 while (!kthread_should_stop()) {
3848 msleep(100);
3849 }
3850 }
e48354ce
NB		 3851 return 0;
3852}
3853
3e1c81a9
NB		 3854static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3855{
3856 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3857 struct iscsi_cmd *cmd;
3858 int ret = 0;
3859
3860 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3861 case ISCSI_OP_SCSI_CMD:
676687c6 3862 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3863 if (!cmd)
ba159914 3864 goto reject;
3e1c81a9
NB		 3865
3866 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3867 break;
3868 case ISCSI_OP_SCSI_DATA_OUT:
3869 ret = iscsit_handle_data_out(conn, buf);
3870 break;
3871 case ISCSI_OP_NOOP_OUT:
3872 cmd = NULL;
3873 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
676687c6 3874 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3875 if (!cmd)
ba159914 3876 goto reject;
3e1c81a9
NB		 3877 }
3878 ret = iscsit_handle_nop_out(conn, cmd, buf);
3879 break;
3880 case ISCSI_OP_SCSI_TMFUNC:
676687c6 3881 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3882 if (!cmd)
ba159914 3883 goto reject;
3e1c81a9
NB		 3884
3885 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3886 break;
3887 case ISCSI_OP_TEXT:
e4f4e801
SG		 3888 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3889 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3890 if (!cmd)
3891 goto reject;
3892 } else {
3893 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3894 if (!cmd)
3895 goto reject;
3896 }
64534aa7
NB		 3897
3898 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 3899 break;
3900 case ISCSI_OP_LOGOUT:
676687c6 3901 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 3902 if (!cmd)
ba159914 3903 goto reject;
3e1c81a9
NB		 3904
3905 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3906 if (ret > 0)
3907 wait_for_completion_timeout(&conn->conn_logout_comp,
3908 SECONDS_FOR_LOGOUT_COMP * HZ);
3909 break;
3910 case ISCSI_OP_SNACK:
3911 ret = iscsit_handle_snack(conn, buf);
3912 break;
3913 default:
3914 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3915 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3916 pr_err("Cannot recover from unknown"
3917 " opcode while ERL=0, closing iSCSI connection.\n");
3918 return -1;
3919 }
c04a6091
CVB		 3920 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3921 " closing iSCSI connection.\n");
3922 ret = -1;
3e1c81a9
NB		 3923 break;
3924 }
3925
3926 return ret;
ba159914
NB		 3927reject:
3928 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 3929}
3930
ca82c2bd
NB		 3931static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3932{
3933 bool ret;
3934
3935 spin_lock_bh(&conn->state_lock);
3936 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3937 spin_unlock_bh(&conn->state_lock);
3938
3939 return ret;
3940}
3941
e8205cca 3942static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
e48354ce 3943{
e8205cca 3944 int ret;
dd2c954f 3945 u8 *buffer, opcode;
e48354ce 3946 u32 checksum = 0, digest = 0;
e48354ce 3947 struct kvec iov;
3e1c81a9 3948
dd2c954f
LA		 3949 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3950 if (!buffer)
3951 return;
3952
e48354ce
NB		 3953 while (!kthread_should_stop()) {
3954 /*
3955 * Ensure that both TX and RX per connection kthreads
3956 * are scheduled to run on the same CPU.
3957 */
3958 iscsit_thread_check_cpumask(conn, current, 0);
3959
e48354ce
NB		 3960 memset(&iov, 0, sizeof(struct kvec));
3961
3962 iov.iov_base = buffer;
3963 iov.iov_len = ISCSI_HDR_LEN;
3964
3965 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3966 if (ret != ISCSI_HDR_LEN) {
3967 iscsit_rx_thread_wait_for_tcp(conn);
dd2c954f 3968 break;
e48354ce
NB		 3969 }
3970
e48354ce
NB		 3971 if (conn->conn_ops->HeaderDigest) {
3972 iov.iov_base = &digest;
3973 iov.iov_len = ISCSI_CRC_LEN;
3974
3975 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3976 if (ret != ISCSI_CRC_LEN) {
3977 iscsit_rx_thread_wait_for_tcp(conn);
dd2c954f 3978 break;
e48354ce
NB		 3979 }
3980
e1dfb21f
BVA		 3981 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3982 ISCSI_HDR_LEN, 0, NULL,
3983 &checksum);
e48354ce
NB		 3984
3985 if (digest != checksum) {
3986 pr_err("HeaderDigest CRC32C failed,"
3987 " received 0x%08x, computed 0x%08x\n",
3988 digest, checksum);
3989 /*
3990 * Set the PDU to 0xff so it will intentionally
3991 * hit default in the switch below.
3992 */
3993 memset(buffer, 0xff, ISCSI_HDR_LEN);
04f3b31b 3994 atomic_long_inc(&conn->sess->conn_digest_errors);
e48354ce
NB		 3995 } else {
3996 pr_debug("Got HeaderDigest CRC32C"
3997 " 0x%08x\n", checksum);
3998 }
3999 }
4000
4001 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
dd2c954f 4002 break;
e48354ce
NB		 4003
4004 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4005
4006 if (conn->sess->sess_ops->SessionType &&
4007 ((!(opcode & ISCSI_OP_TEXT)) ||
4008 (!(opcode & ISCSI_OP_LOGOUT)))) {
4009 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4010 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4011 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4012 buffer);
dd2c954f 4013 break;
e48354ce
NB		 4014 }
4015
3e1c81a9
NB		 4016 ret = iscsi_target_rx_opcode(conn, buffer);
4017 if (ret < 0)
dd2c954f 4018 break;
e48354ce 4019 }
dd2c954f
LA		 4020
4021 kfree(buffer);
e8205cca
VP		 4022}
4023
4024int iscsi_target_rx_thread(void *arg)
4025{
4026 int rc;
4027 struct iscsi_conn *conn = arg;
5e0cf5e6 4028 bool conn_freed = false;
e8205cca
VP		 4029
4030 /*
4031 * Allow ourselves to be interrupted by SIGINT so that a
4032 * connection recovery / failure event can be triggered externally.
4033 */
4034 allow_signal(SIGINT);
4035 /*
4036 * Wait for iscsi_post_login_handler() to complete before allowing
4037 * incoming iscsi/tcp socket I/O, and/or failing the connection.
4038 */
4039 rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4040 if (rc < 0 || iscsi_target_check_conn_state(conn))
5e0cf5e6 4041 goto out;
e8205cca
VP		 4042
4043 if (!conn->conn_transport->iscsit_get_rx_pdu)
4044 return 0;
4045
4046 conn->conn_transport->iscsit_get_rx_pdu(conn);
e48354ce 4047
e48354ce
NB		 4048 if (!signal_pending(current))
4049 atomic_set(&conn->transport_failed, 1);
5e0cf5e6
JY		 4050 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4051
4052out:
4053 if (!conn_freed) {
4054 while (!kthread_should_stop()) {
4055 msleep(100);
4056 }
4057 }
4058
e48354ce
NB		 4059 return 0;
4060}
4061
4062static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4063{
064cdd2d 4064 LIST_HEAD(tmp_list);
e48354ce
NB		 4065 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4066 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4067 /*
4068 * We expect this function to only ever be called from either RX or TX
4069 * thread context via iscsit_close_connection() once the other context
4070 * has been reset -> returned sleeping pre-handler state.
4071 */
4072 spin_lock_bh(&conn->cmd_lock);
064cdd2d 4073 list_splice_init(&conn->conn_cmd_list, &tmp_list);
e48354ce 4074
064cdd2d
NB		 4075 list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4076 struct se_cmd *se_cmd = &cmd->se_cmd;
4077
4078 if (se_cmd->se_tfo != NULL) {
226e8556 4079 spin_lock_irq(&se_cmd->t_state_lock);
064cdd2d 4080 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
226e8556 4081 spin_unlock_irq(&se_cmd->t_state_lock);
064cdd2d
NB		 4082 }
4083 }
4084 spin_unlock_bh(&conn->cmd_lock);
4085
4086 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
5159d763 4087 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4088
4089 iscsit_increment_maxcmdsn(cmd, sess);
aafc9d15 4090 iscsit_free_cmd(cmd, true);
e48354ce 4091
e48354ce 4092 }
e48354ce
NB		 4093}
4094
4095static void iscsit_stop_timers_for_cmds(
4096 struct iscsi_conn *conn)
4097{
4098 struct iscsi_cmd *cmd;
4099
4100 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4101 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4102 if (cmd->data_direction == DMA_TO_DEVICE)
4103 iscsit_stop_dataout_timer(cmd);
4104 }
4105 spin_unlock_bh(&conn->cmd_lock);
4106}
4107
4108int iscsit_close_connection(
4109 struct iscsi_conn *conn)
4110{
4111 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4112 struct iscsi_session *sess = conn->sess;
4113
4114 pr_debug("Closing iSCSI connection CID %hu on SID:"
4115 " %u\n", conn->cid, sess->sid);
4116 /*
b4869ee9
VP		 4117 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4118 * case just in case the RX Thread in iscsi_target_rx_opcode() is
4119 * sleeping and the logout response never got sent because the
4120 * connection failed.
f068fbc8
NB		 4121 *
4122 * However for iser-target, isert_wait4logout() is using conn_logout_comp
4123 * to signal logout response TX interrupt completion. Go ahead and skip
4124 * this for iser since isert_rx_opcode() does not wait on logout failure,
4125 * and to avoid iscsi_conn pointer dereference in iser-target code.
e48354ce 4126 */
bd027d85 4127 if (!conn->conn_transport->rdma_shutdown)
f068fbc8 4128 complete(&conn->conn_logout_comp);
e48354ce 4129
88dcd2da
NB		 4130 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4131 if (conn->tx_thread &&
4132 cmpxchg(&conn->tx_thread_active, true, false)) {
4133 send_sig(SIGINT, conn->tx_thread, 1);
4134 kthread_stop(conn->tx_thread);
4135 }
4136 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4137 if (conn->rx_thread &&
4138 cmpxchg(&conn->rx_thread_active, true, false)) {
4139 send_sig(SIGINT, conn->rx_thread, 1);
4140 kthread_stop(conn->rx_thread);
4141 }
4142 }
4143
4144 spin_lock(&iscsit_global->ts_bitmap_lock);
4145 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4146 get_order(1));
4147 spin_unlock(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 4148
4149 iscsit_stop_timers_for_cmds(conn);
4150 iscsit_stop_nopin_response_timer(conn);
4151 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4152
4153 if (conn->conn_transport->iscsit_wait_conn)
4154 conn->conn_transport->iscsit_wait_conn(conn);
4155
e48354ce
NB		 4156 /*
4157 * During Connection recovery drop unacknowledged out of order
4158 * commands for this connection, and prepare the other commands
53c561dc 4159 * for reallegiance.
e48354ce
NB		 4160 *
4161 * During normal operation clear the out of order commands (but
4162 * do not free the struct iscsi_ooo_cmdsn's) and release all
4163 * struct iscsi_cmds.
4164 */
4165 if (atomic_read(&conn->connection_recovery)) {
4166 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
53c561dc 4167 iscsit_prepare_cmds_for_reallegiance(conn);
e48354ce
NB		 4168 } else {
4169 iscsit_clear_ooo_cmdsns_for_conn(conn);
4170 iscsit_release_commands_from_conn(conn);
4171 }
bbc05048 4172 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4173
4174 /*
4175 * Handle decrementing session or connection usage count if
4176 * a logout response was not able to be sent because the
4177 * connection failed. Fall back to Session Recovery here.
4178 */
4179 if (atomic_read(&conn->conn_logout_remove)) {
4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4181 iscsit_dec_conn_usage_count(conn);
4182 iscsit_dec_session_usage_count(sess);
4183 }
4184 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4185 iscsit_dec_conn_usage_count(conn);
4186
4187 atomic_set(&conn->conn_logout_remove, 0);
4188 atomic_set(&sess->session_reinstatement, 0);
4189 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190 }
4191
4192 spin_lock_bh(&sess->conn_lock);
4193 list_del(&conn->conn_list);
4194
4195 /*
4196 * Attempt to let the Initiator know this connection failed by
4197 * sending an Connection Dropped Async Message on another
4198 * active connection.
4199 */
4200 if (atomic_read(&conn->connection_recovery))
4201 iscsit_build_conn_drop_async_message(conn);
4202
4203 spin_unlock_bh(&sess->conn_lock);
4204
4205 /*
4206 * If connection reinstatement is being performed on this connection,
4207 * up the connection reinstatement semaphore that is being blocked on
4208 * in iscsit_cause_connection_reinstatement().
4209 */
4210 spin_lock_bh(&conn->state_lock);
4211 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4212 spin_unlock_bh(&conn->state_lock);
4213 complete(&conn->conn_wait_comp);
4214 wait_for_completion(&conn->conn_post_wait_comp);
4215 spin_lock_bh(&conn->state_lock);
4216 }
4217
4218 /*
4219 * If connection reinstatement is being performed on this connection
4220 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4221 * connection wait rcfr semaphore that is being blocked on
4222 * an iscsit_connection_reinstatement_rcfr().
4223 */
4224 if (atomic_read(&conn->connection_wait_rcfr)) {
4225 spin_unlock_bh(&conn->state_lock);
4226 complete(&conn->conn_wait_rcfr_comp);
4227 wait_for_completion(&conn->conn_post_wait_comp);
4228 spin_lock_bh(&conn->state_lock);
4229 }
4230 atomic_set(&conn->connection_reinstatement, 1);
4231 spin_unlock_bh(&conn->state_lock);
4232
4233 /*
4234 * If any other processes are accessing this connection pointer we
4235 * must wait until they have completed.
4236 */
4237 iscsit_check_conn_usage_count(conn);
53eb5c32
BVA		 4238 target_sess_cmd_list_set_waiting(sess->se_sess);
4239 target_wait_for_sess_cmds(sess->se_sess);
e48354ce 4240
69110e3c
HX		 4241 ahash_request_free(conn->conn_tx_hash);
4242 if (conn->conn_rx_hash) {
4243 struct crypto_ahash *tfm;
4244
4245 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4246 ahash_request_free(conn->conn_rx_hash);
4247 crypto_free_ahash(tfm);
4248 }
e48354ce 4249
bf6932f4 4250 if (conn->sock)
e48354ce 4251 sock_release(conn->sock);
baa4d64b
NB		 4252
4253 if (conn->conn_transport->iscsit_free_conn)
4254 conn->conn_transport->iscsit_free_conn(conn);
4255
e48354ce
NB		 4256 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4257 conn->conn_state = TARG_CONN_STATE_FREE;
fbb61ddb 4258 iscsit_free_conn(conn);
e48354ce
NB		 4259
4260 spin_lock_bh(&sess->conn_lock);
4261 atomic_dec(&sess->nconn);
4262 pr_debug("Decremented iSCSI connection count to %hu from node:"
4263 " %s\n", atomic_read(&sess->nconn),
4264 sess->sess_ops->InitiatorName);
4265 /*
4266 * Make sure that if one connection fails in an non ERL=2 iSCSI
4267 * Session that they all fail.
4268 */
4269 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4270 !atomic_read(&sess->session_logout))
4271 atomic_set(&sess->session_fall_back_to_erl0, 1);
4272
4273 /*
4274 * If this was not the last connection in the session, and we are
4275 * performing session reinstatement or falling back to ERL=0, call
4276 * iscsit_stop_session() without sleeping to shutdown the other
4277 * active connections.
4278 */
4279 if (atomic_read(&sess->nconn)) {
4280 if (!atomic_read(&sess->session_reinstatement) &&
4281 !atomic_read(&sess->session_fall_back_to_erl0)) {
4282 spin_unlock_bh(&sess->conn_lock);
4283 return 0;
4284 }
4285 if (!atomic_read(&sess->session_stop_active)) {
4286 atomic_set(&sess->session_stop_active, 1);
4287 spin_unlock_bh(&sess->conn_lock);
4288 iscsit_stop_session(sess, 0, 0);
4289 return 0;
4290 }
4291 spin_unlock_bh(&sess->conn_lock);
4292 return 0;
4293 }
4294
4295 /*
4296 * If this was the last connection in the session and one of the
4297 * following is occurring:
4298 *
4299 * Session Reinstatement is not being performed, and are falling back
4300 * to ERL=0 call iscsit_close_session().
4301 *
4302 * Session Logout was requested. iscsit_close_session() will be called
4303 * elsewhere.
4304 *
4305 * Session Continuation is not being performed, start the Time2Retain
4306 * handler and check if sleep_on_sess_wait_sem is active.
4307 */
4308 if (!atomic_read(&sess->session_reinstatement) &&
4309 atomic_read(&sess->session_fall_back_to_erl0)) {
4310 spin_unlock_bh(&sess->conn_lock);
44f33d0f 4311 iscsit_close_session(sess);
e48354ce
NB		 4312
4313 return 0;
4314 } else if (atomic_read(&sess->session_logout)) {
4315 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4316 sess->session_state = TARG_SESS_STATE_FREE;
4317 spin_unlock_bh(&sess->conn_lock);
4318
4319 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4320 complete(&sess->session_wait_comp);
4321
4322 return 0;
4323 } else {
4324 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4325 sess->session_state = TARG_SESS_STATE_FAILED;
4326
4327 if (!atomic_read(&sess->session_continuation)) {
4328 spin_unlock_bh(&sess->conn_lock);
4329 iscsit_start_time2retain_handler(sess);
4330 } else
4331 spin_unlock_bh(&sess->conn_lock);
4332
4333 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4334 complete(&sess->session_wait_comp);
4335
4336 return 0;
4337 }
e48354ce
NB		 4338}
4339
44f33d0f
CH		 4340/*
4341 * If the iSCSI Session for the iSCSI Initiator Node exists,
4342 * forcefully shutdown the iSCSI NEXUS.
4343 */
e48354ce
NB		 4344int iscsit_close_session(struct iscsi_session *sess)
4345{
60bfcf8e 4346 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4347 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4348
4349 if (atomic_read(&sess->nconn)) {
4350 pr_err("%d connection(s) still exist for iSCSI session"
4351 " to %s\n", atomic_read(&sess->nconn),
4352 sess->sess_ops->InitiatorName);
4353 BUG();
4354 }
4355
4356 spin_lock_bh(&se_tpg->session_lock);
4357 atomic_set(&sess->session_logout, 1);
4358 atomic_set(&sess->session_reinstatement, 1);
4359 iscsit_stop_time2retain_timer(sess);
4360 spin_unlock_bh(&se_tpg->session_lock);
4361
4362 /*
4363 * transport_deregister_session_configfs() will clear the
4364 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4365 * can be setting it again with __transport_register_session() in
4366 * iscsi_post_login_handler() again after the iscsit_stop_session()
4367 * completes in iscsi_np context.
4368 */
4369 transport_deregister_session_configfs(sess->se_sess);
4370
4371 /*
4372 * If any other processes are accessing this session pointer we must
4373 * wait until they have completed. If we are in an interrupt (the
4374 * time2retain handler) and contain and active session usage count we
4375 * restart the timer and exit.
4376 */
4377 if (!in_interrupt()) {
4378 if (iscsit_check_session_usage_count(sess) == 1)
4379 iscsit_stop_session(sess, 1, 1);
4380 } else {
4381 if (iscsit_check_session_usage_count(sess) == 2) {
4382 atomic_set(&sess->session_logout, 0);
4383 iscsit_start_time2retain_handler(sess);
4384 return 0;
4385 }
4386 }
4387
4388 transport_deregister_session(sess->se_sess);
4389
4390 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4391 iscsit_free_connection_recovery_entires(sess);
4392
4393 iscsit_free_all_ooo_cmdsns(sess);
4394
4395 spin_lock_bh(&se_tpg->session_lock);
4396 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4397 sess->session_state = TARG_SESS_STATE_FREE;
4398 pr_debug("Released iSCSI session from node: %s\n",
4399 sess->sess_ops->InitiatorName);
4400 tpg->nsessions--;
4401 if (tpg->tpg_tiqn)
4402 tpg->tpg_tiqn->tiqn_nsessions--;
4403
4404 pr_debug("Decremented number of active iSCSI Sessions on"
4405 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4406
4407 spin_lock(&sess_idr_lock);
4408 idr_remove(&sess_idr, sess->session_index);
4409 spin_unlock(&sess_idr_lock);
4410
4411 kfree(sess->sess_ops);
4412 sess->sess_ops = NULL;
4413 spin_unlock_bh(&se_tpg->session_lock);
4414
4415 kfree(sess);
4416 return 0;
4417}
4418
4419static void iscsit_logout_post_handler_closesession(
4420 struct iscsi_conn *conn)
4421{
4422 struct iscsi_session *sess = conn->sess;
007d038b
NB		 4423 int sleep = 1;
4424 /*
4425 * Traditional iscsi/tcp will invoke this logic from TX thread
4426 * context during session logout, so clear tx_thread_active and
4427 * sleep if iscsit_close_connection() has not already occured.
4428 *
4429 * Since iser-target invokes this logic from it's own workqueue,
4430 * always sleep waiting for RX/TX thread shutdown to complete
4431 * within iscsit_close_connection().
4432 */
105fa2f4 4433 if (!conn->conn_transport->rdma_shutdown) {
007d038b 4434 sleep = cmpxchg(&conn->tx_thread_active, true, false);
105fa2f4
NB		 4435 if (!sleep)
4436 return;
4437 }
e48354ce
NB		 4438
4439 atomic_set(&conn->conn_logout_remove, 0);
4440 complete(&conn->conn_logout_comp);
4441
4442 iscsit_dec_conn_usage_count(conn);
88dcd2da 4443 iscsit_stop_session(sess, sleep, sleep);
e48354ce 4444 iscsit_dec_session_usage_count(sess);
44f33d0f 4445 iscsit_close_session(sess);
e48354ce
NB		 4446}
4447
4448static void iscsit_logout_post_handler_samecid(
4449 struct iscsi_conn *conn)
4450{
007d038b
NB		 4451 int sleep = 1;
4452
105fa2f4 4453 if (!conn->conn_transport->rdma_shutdown) {
007d038b 4454 sleep = cmpxchg(&conn->tx_thread_active, true, false);
105fa2f4
NB		 4455 if (!sleep)
4456 return;
4457 }
e48354ce
NB		 4458
4459 atomic_set(&conn->conn_logout_remove, 0);
4460 complete(&conn->conn_logout_comp);
4461
88dcd2da 4462 iscsit_cause_connection_reinstatement(conn, sleep);
e48354ce
NB		 4463 iscsit_dec_conn_usage_count(conn);
4464}
4465
4466static void iscsit_logout_post_handler_diffcid(
4467 struct iscsi_conn *conn,
4468 u16 cid)
4469{
4470 struct iscsi_conn *l_conn;
4471 struct iscsi_session *sess = conn->sess;
b53b0d99 4472 bool conn_found = false;
e48354ce
NB		 4473
4474 if (!sess)
4475 return;
4476
4477 spin_lock_bh(&sess->conn_lock);
4478 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4479 if (l_conn->cid == cid) {
4480 iscsit_inc_conn_usage_count(l_conn);
b53b0d99 4481 conn_found = true;
e48354ce
NB		 4482 break;
4483 }
4484 }
4485 spin_unlock_bh(&sess->conn_lock);
4486
b53b0d99 4487 if (!conn_found)
e48354ce
NB		 4488 return;
4489
4490 if (l_conn->sock)
4491 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4492
4493 spin_lock_bh(&l_conn->state_lock);
4494 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4495 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4496 spin_unlock_bh(&l_conn->state_lock);
4497
4498 iscsit_cause_connection_reinstatement(l_conn, 1);
4499 iscsit_dec_conn_usage_count(l_conn);
4500}
4501
4502/*
4503 * Return of 0 causes the TX thread to restart.
4504 */
2ec5a8c1 4505int iscsit_logout_post_handler(
e48354ce
NB		 4506 struct iscsi_cmd *cmd,
4507 struct iscsi_conn *conn)
4508{
4509 int ret = 0;
4510
4511 switch (cmd->logout_reason) {
4512 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4513 switch (cmd->logout_response) {
4514 case ISCSI_LOGOUT_SUCCESS:
4515 case ISCSI_LOGOUT_CLEANUP_FAILED:
4516 default:
4517 iscsit_logout_post_handler_closesession(conn);
4518 break;
4519 }
4520 ret = 0;
4521 break;
4522 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4523 if (conn->cid == cmd->logout_cid) {
4524 switch (cmd->logout_response) {
4525 case ISCSI_LOGOUT_SUCCESS:
4526 case ISCSI_LOGOUT_CLEANUP_FAILED:
4527 default:
4528 iscsit_logout_post_handler_samecid(conn);
4529 break;
4530 }
4531 ret = 0;
4532 } else {
4533 switch (cmd->logout_response) {
4534 case ISCSI_LOGOUT_SUCCESS:
4535 iscsit_logout_post_handler_diffcid(conn,
4536 cmd->logout_cid);
4537 break;
4538 case ISCSI_LOGOUT_CID_NOT_FOUND:
4539 case ISCSI_LOGOUT_CLEANUP_FAILED:
4540 default:
4541 break;
4542 }
4543 ret = 1;
4544 }
4545 break;
4546 case ISCSI_LOGOUT_REASON_RECOVERY:
4547 switch (cmd->logout_response) {
4548 case ISCSI_LOGOUT_SUCCESS:
4549 case ISCSI_LOGOUT_CID_NOT_FOUND:
4550 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4551 case ISCSI_LOGOUT_CLEANUP_FAILED:
4552 default:
4553 break;
4554 }
4555 ret = 1;
4556 break;
4557 default:
4558 break;
4559
4560 }
4561 return ret;
4562}
2ec5a8c1 4563EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4564
4565void iscsit_fail_session(struct iscsi_session *sess)
4566{
4567 struct iscsi_conn *conn;
4568
4569 spin_lock_bh(&sess->conn_lock);
4570 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4571 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4572 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4573 }
4574 spin_unlock_bh(&sess->conn_lock);
4575
4576 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4577 sess->session_state = TARG_SESS_STATE_FAILED;
4578}
4579
4580int iscsit_free_session(struct iscsi_session *sess)
4581{
4582 u16 conn_count = atomic_read(&sess->nconn);
4583 struct iscsi_conn *conn, *conn_tmp = NULL;
4584 int is_last;
4585
4586 spin_lock_bh(&sess->conn_lock);
4587 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4588
4589 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4590 conn_list) {
4591 if (conn_count == 0)
4592 break;
4593
4594 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4595 is_last = 1;
4596 } else {
4597 iscsit_inc_conn_usage_count(conn_tmp);
4598 is_last = 0;
4599 }
4600 iscsit_inc_conn_usage_count(conn);
4601
4602 spin_unlock_bh(&sess->conn_lock);
4603 iscsit_cause_connection_reinstatement(conn, 1);
4604 spin_lock_bh(&sess->conn_lock);
4605
4606 iscsit_dec_conn_usage_count(conn);
4607 if (is_last == 0)
4608 iscsit_dec_conn_usage_count(conn_tmp);
4609
4610 conn_count--;
4611 }
4612
4613 if (atomic_read(&sess->nconn)) {
4614 spin_unlock_bh(&sess->conn_lock);
4615 wait_for_completion(&sess->session_wait_comp);
4616 } else
4617 spin_unlock_bh(&sess->conn_lock);
4618
44f33d0f 4619 iscsit_close_session(sess);
e48354ce
NB		 4620 return 0;
4621}
4622
4623void iscsit_stop_session(
4624 struct iscsi_session *sess,
4625 int session_sleep,
4626 int connection_sleep)
4627{
4628 u16 conn_count = atomic_read(&sess->nconn);
4629 struct iscsi_conn *conn, *conn_tmp = NULL;
4630 int is_last;
4631
4632 spin_lock_bh(&sess->conn_lock);
4633 if (session_sleep)
4634 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4635
4636 if (connection_sleep) {
4637 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4638 conn_list) {
4639 if (conn_count == 0)
4640 break;
4641
4642 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4643 is_last = 1;
4644 } else {
4645 iscsit_inc_conn_usage_count(conn_tmp);
4646 is_last = 0;
4647 }
4648 iscsit_inc_conn_usage_count(conn);
4649
4650 spin_unlock_bh(&sess->conn_lock);
4651 iscsit_cause_connection_reinstatement(conn, 1);
4652 spin_lock_bh(&sess->conn_lock);
4653
4654 iscsit_dec_conn_usage_count(conn);
4655 if (is_last == 0)
4656 iscsit_dec_conn_usage_count(conn_tmp);
4657 conn_count--;
4658 }
4659 } else {
4660 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4661 iscsit_cause_connection_reinstatement(conn, 0);
4662 }
4663
4664 if (session_sleep && atomic_read(&sess->nconn)) {
4665 spin_unlock_bh(&sess->conn_lock);
4666 wait_for_completion(&sess->session_wait_comp);
4667 } else
4668 spin_unlock_bh(&sess->conn_lock);
4669}
4670
4671int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4672{
4673 struct iscsi_session *sess;
4674 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4675 struct se_session *se_sess, *se_sess_tmp;
417c20a9 4676 LIST_HEAD(free_list);
e48354ce
NB		 4677 int session_count = 0;
4678
4679 spin_lock_bh(&se_tpg->session_lock);
4680 if (tpg->nsessions && !force) {
4681 spin_unlock_bh(&se_tpg->session_lock);
4682 return -1;
4683 }
4684
4685 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4686 sess_list) {
4687 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4688
4689 spin_lock(&sess->conn_lock);
4690 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4691 atomic_read(&sess->session_logout) ||
4692 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4693 spin_unlock(&sess->conn_lock);
4694 continue;
4695 }
4696 atomic_set(&sess->session_reinstatement, 1);
197b806a 4697 atomic_set(&sess->session_fall_back_to_erl0, 1);
e48354ce 4698 spin_unlock(&sess->conn_lock);
e48354ce 4699
417c20a9
NB		 4700 list_move_tail(&se_sess->sess_list, &free_list);
4701 }
4702 spin_unlock_bh(&se_tpg->session_lock);
e48354ce 4703
417c20a9
NB		 4704 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4705 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4706
4707 iscsit_free_session(sess);
e48354ce
NB		 4708 session_count++;
4709 }
e48354ce
NB		 4710
4711 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4712 " Group: %hu\n", session_count, tpg->tpgt);
4713 return 0;
4714}
4715
4716MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4717MODULE_VERSION("4.1.x");
4718MODULE_AUTHOR("nab@Linux-iSCSI.org");
4719MODULE_LICENSE("GPL");
4720
4721module_init(iscsi_target_init_module);
4722module_exit(iscsi_target_cleanup_module);
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