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iscsi-target: Drop legacy iscsi_target_tq.c logic
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains main functions related to the iSCSI Target Core Driver.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19#include <linux/string.h>
20#include <linux/kthread.h>
21#include <linux/crypto.h>
22#include <linux/completion.h>
827509e3 23#include <linux/module.h>
40401530 24#include <linux/idr.h>
e48354ce
NB		 25#include <asm/unaligned.h>
26#include <scsi/scsi_device.h>
27#include <scsi/iscsi_proto.h>
d28b1169 28#include <scsi/scsi_tcq.h>
e48354ce 29#include <target/target_core_base.h>
c4795fb2 30#include <target/target_core_fabric.h>
d28b1169 31#include <target/target_core_configfs.h>
e48354ce 32
67f091f2 33#include <target/iscsi/iscsi_target_core.h>
e48354ce
NB		 34#include "iscsi_target_parameters.h"
35#include "iscsi_target_seq_pdu_list.h"
e48354ce
NB		 36#include "iscsi_target_configfs.h"
37#include "iscsi_target_datain_values.h"
38#include "iscsi_target_erl0.h"
39#include "iscsi_target_erl1.h"
40#include "iscsi_target_erl2.h"
41#include "iscsi_target_login.h"
42#include "iscsi_target_tmr.h"
43#include "iscsi_target_tpg.h"
44#include "iscsi_target_util.h"
45#include "iscsi_target.h"
46#include "iscsi_target_device.h"
67f091f2 47#include <target/iscsi/iscsi_target_stat.h>
e48354ce 48
baa4d64b
NB		 49#include <target/iscsi/iscsi_transport.h>
50
e48354ce
NB		 51static LIST_HEAD(g_tiqn_list);
52static LIST_HEAD(g_np_list);
53static DEFINE_SPINLOCK(tiqn_lock);
ee291e63 54static DEFINE_MUTEX(np_lock);
e48354ce
NB		 55
56static struct idr tiqn_idr;
57struct idr sess_idr;
58struct mutex auth_id_lock;
59spinlock_t sess_idr_lock;
60
61struct iscsit_global *iscsit_global;
62
e48354ce
NB		 63struct kmem_cache *lio_qr_cache;
64struct kmem_cache *lio_dr_cache;
65struct kmem_cache *lio_ooo_cache;
66struct kmem_cache *lio_r2t_cache;
67
68static int iscsit_handle_immediate_data(struct iscsi_cmd *,
2ec5a8c1 69 struct iscsi_scsi_req *, u32);
e48354ce
NB		 70
71struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
72{
73 struct iscsi_tiqn *tiqn = NULL;
74
75 spin_lock(&tiqn_lock);
76 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
77 if (!strcmp(tiqn->tiqn, buf)) {
78
79 spin_lock(&tiqn->tiqn_state_lock);
80 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
81 tiqn->tiqn_access_count++;
82 spin_unlock(&tiqn->tiqn_state_lock);
83 spin_unlock(&tiqn_lock);
84 return tiqn;
85 }
86 spin_unlock(&tiqn->tiqn_state_lock);
87 }
88 }
89 spin_unlock(&tiqn_lock);
90
91 return NULL;
92}
93
94static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
95{
96 spin_lock(&tiqn->tiqn_state_lock);
97 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
98 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
99 spin_unlock(&tiqn->tiqn_state_lock);
100 return 0;
101 }
102 spin_unlock(&tiqn->tiqn_state_lock);
103
104 return -1;
105}
106
107void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
108{
109 spin_lock(&tiqn->tiqn_state_lock);
110 tiqn->tiqn_access_count--;
111 spin_unlock(&tiqn->tiqn_state_lock);
112}
113
114/*
115 * Note that IQN formatting is expected to be done in userspace, and
116 * no explict IQN format checks are done here.
117 */
118struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
119{
120 struct iscsi_tiqn *tiqn = NULL;
121 int ret;
122
8f50c7f5 123 if (strlen(buf) >= ISCSI_IQN_LEN) {
e48354ce
NB		 124 pr_err("Target IQN exceeds %d bytes\n",
125 ISCSI_IQN_LEN);
126 return ERR_PTR(-EINVAL);
127 }
128
129 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
130 if (!tiqn) {
131 pr_err("Unable to allocate struct iscsi_tiqn\n");
132 return ERR_PTR(-ENOMEM);
133 }
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);
e48354ce
NB		 234 if ((ret != 0) || signal_pending(current))
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(
e48354ce 273 struct __kernel_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;
e48354ce
NB		 280 u16 port;
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);
292 } else {
293 sock_in = (struct sockaddr_in *)sockaddr;
294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
295
296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
297 ip_match = true;
298
299 port = ntohs(sock_in->sin_port);
300 }
301
0bcc297e 302 if (ip_match && (np->np_port == port) &&
05b96892
NB		 303 (np->np_network_transport == network_transport))
304 return true;
305
306 return false;
307}
308
ee291e63
AG		 309/*
310 * Called with mutex np_lock held
311 */
05b96892
NB		 312static struct iscsi_np *iscsit_get_np(
313 struct __kernel_sockaddr_storage *sockaddr,
314 int network_transport)
315{
316 struct iscsi_np *np;
317 bool match;
318
e48354ce 319 list_for_each_entry(np, &g_np_list, np_list) {
ee291e63 320 spin_lock_bh(&np->np_thread_lock);
e48354ce 321 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
ee291e63 322 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 323 continue;
324 }
325
05b96892 326 match = iscsit_check_np_match(sockaddr, np, network_transport);
0bcc297e 327 if (match) {
e48354ce
NB		 328 /*
329 * Increment the np_exports reference count now to
330 * prevent iscsit_del_np() below from being called
331 * while iscsi_tpg_add_network_portal() is called.
332 */
333 np->np_exports++;
ee291e63 334 spin_unlock_bh(&np->np_thread_lock);
e48354ce
NB		 335 return np;
336 }
ee291e63 337 spin_unlock_bh(&np->np_thread_lock);
e48354ce 338 }
e48354ce
NB		 339
340 return NULL;
341}
342
343struct iscsi_np *iscsit_add_np(
344 struct __kernel_sockaddr_storage *sockaddr,
345 char *ip_str,
346 int network_transport)
347{
348 struct sockaddr_in *sock_in;
349 struct sockaddr_in6 *sock_in6;
350 struct iscsi_np *np;
351 int ret;
ee291e63
AG		 352
353 mutex_lock(&np_lock);
354
e48354ce
NB		 355 /*
356 * Locate the existing struct iscsi_np if already active..
357 */
358 np = iscsit_get_np(sockaddr, network_transport);
ee291e63
AG		 359 if (np) {
360 mutex_unlock(&np_lock);
e48354ce 361 return np;
ee291e63 362 }
e48354ce
NB		 363
364 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
365 if (!np) {
366 pr_err("Unable to allocate memory for struct iscsi_np\n");
ee291e63 367 mutex_unlock(&np_lock);
e48354ce
NB		 368 return ERR_PTR(-ENOMEM);
369 }
370
371 np->np_flags |= NPF_IP_NETWORK;
372 if (sockaddr->ss_family == AF_INET6) {
373 sock_in6 = (struct sockaddr_in6 *)sockaddr;
374 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
375 np->np_port = ntohs(sock_in6->sin6_port);
376 } else {
377 sock_in = (struct sockaddr_in *)sockaddr;
378 sprintf(np->np_ip, "%s", ip_str);
379 np->np_port = ntohs(sock_in->sin_port);
380 }
381
382 np->np_network_transport = network_transport;
383 spin_lock_init(&np->np_thread_lock);
384 init_completion(&np->np_restart_comp);
385 INIT_LIST_HEAD(&np->np_list);
386
387 ret = iscsi_target_setup_login_socket(np, sockaddr);
388 if (ret != 0) {
389 kfree(np);
ee291e63 390 mutex_unlock(&np_lock);
e48354ce
NB		 391 return ERR_PTR(ret);
392 }
393
394 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
395 if (IS_ERR(np->np_thread)) {
396 pr_err("Unable to create kthread: iscsi_np\n");
397 ret = PTR_ERR(np->np_thread);
398 kfree(np);
ee291e63 399 mutex_unlock(&np_lock);
e48354ce
NB		 400 return ERR_PTR(ret);
401 }
402 /*
403 * Increment the np_exports reference count now to prevent
404 * iscsit_del_np() below from being run while a new call to
405 * iscsi_tpg_add_network_portal() for a matching iscsi_np is
406 * active. We don't need to hold np->np_thread_lock at this
407 * point because iscsi_np has not been added to g_np_list yet.
408 */
409 np->np_exports = 1;
ee291e63 410 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
e48354ce 411
e48354ce 412 list_add_tail(&np->np_list, &g_np_list);
ee291e63 413 mutex_unlock(&np_lock);
e48354ce
NB		 414
415 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
baa4d64b 416 np->np_ip, np->np_port, np->np_transport->name);
e48354ce
NB		 417
418 return np;
419}
420
421int iscsit_reset_np_thread(
422 struct iscsi_np *np,
423 struct iscsi_tpg_np *tpg_np,
a91eb7d9
NB		 424 struct iscsi_portal_group *tpg,
425 bool shutdown)
e48354ce
NB		 426{
427 spin_lock_bh(&np->np_thread_lock);
e48354ce
NB		 428 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
429 spin_unlock_bh(&np->np_thread_lock);
430 return 0;
431 }
432 np->np_thread_state = ISCSI_NP_THREAD_RESET;
433
434 if (np->np_thread) {
435 spin_unlock_bh(&np->np_thread_lock);
436 send_sig(SIGINT, np->np_thread, 1);
437 wait_for_completion(&np->np_restart_comp);
438 spin_lock_bh(&np->np_thread_lock);
439 }
440 spin_unlock_bh(&np->np_thread_lock);
441
a91eb7d9
NB		 442 if (tpg_np && shutdown) {
443 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
444
445 wait_for_completion(&tpg_np->tpg_np_comp);
446 }
447
e48354ce
NB		 448 return 0;
449}
450
baa4d64b 451static void iscsit_free_np(struct iscsi_np *np)
e48354ce 452{
bf6932f4
AV		 453 if (np->np_socket)
454 sock_release(np->np_socket);
e48354ce
NB		 455}
456
457int iscsit_del_np(struct iscsi_np *np)
458{
459 spin_lock_bh(&np->np_thread_lock);
460 np->np_exports--;
461 if (np->np_exports) {
2363d196 462 np->enabled = true;
e48354ce
NB		 463 spin_unlock_bh(&np->np_thread_lock);
464 return 0;
465 }
466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
467 spin_unlock_bh(&np->np_thread_lock);
468
469 if (np->np_thread) {
470 /*
471 * We need to send the signal to wakeup Linux/Net
472 * which may be sleeping in sock_accept()..
473 */
474 send_sig(SIGINT, np->np_thread, 1);
475 kthread_stop(np->np_thread);
db6077fd 476 np->np_thread = NULL;
e48354ce 477 }
baa4d64b
NB		 478
479 np->np_transport->iscsit_free_np(np);
e48354ce 480
ee291e63 481 mutex_lock(&np_lock);
e48354ce 482 list_del(&np->np_list);
ee291e63 483 mutex_unlock(&np_lock);
e48354ce
NB		 484
485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
baa4d64b 486 np->np_ip, np->np_port, np->np_transport->name);
e48354ce 487
baa4d64b 488 iscsit_put_transport(np->np_transport);
e48354ce
NB		 489 kfree(np);
490 return 0;
491}
492
2ec5a8c1
NB		 493static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
494static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
495
496static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
497{
498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
499 return 0;
500}
501
131e6abc
NB		 502static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
503{
504 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
505
506 spin_lock_bh(&conn->cmd_lock);
507 if (!list_empty(&cmd->i_conn_node))
508 list_del_init(&cmd->i_conn_node);
509 spin_unlock_bh(&conn->cmd_lock);
510
511 __iscsit_free_cmd(cmd, scsi_cmd, true);
512}
513
e70beee7
NB		 514static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
515{
516 return TARGET_PROT_NORMAL;
517}
518
baa4d64b
NB		 519static struct iscsit_transport iscsi_target_transport = {
520 .name = "iSCSI/TCP",
521 .transport_type = ISCSI_TCP,
522 .owner = NULL,
523 .iscsit_setup_np = iscsit_setup_np,
524 .iscsit_accept_np = iscsit_accept_np,
525 .iscsit_free_np = iscsit_free_np,
526 .iscsit_get_login_rx = iscsit_get_login_rx,
527 .iscsit_put_login_tx = iscsit_put_login_tx,
3e1c81a9 528 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd,
2ec5a8c1
NB		 529 .iscsit_immediate_queue = iscsit_immediate_queue,
530 .iscsit_response_queue = iscsit_response_queue,
531 .iscsit_queue_data_in = iscsit_queue_rsp,
532 .iscsit_queue_status = iscsit_queue_rsp,
131e6abc 533 .iscsit_aborted_task = iscsit_aborted_task,
e70beee7 534 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
baa4d64b
NB		 535};
536
e48354ce
NB		 537static int __init iscsi_target_init_module(void)
538{
88dcd2da 539 int ret = 0, size;
e48354ce
NB		 540
541 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
542
543 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
544 if (!iscsit_global) {
545 pr_err("Unable to allocate memory for iscsit_global\n");
546 return -1;
547 }
88dcd2da 548 spin_lock_init(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 549 mutex_init(&auth_id_lock);
550 spin_lock_init(&sess_idr_lock);
551 idr_init(&tiqn_idr);
552 idr_init(&sess_idr);
553
554 ret = iscsi_target_register_configfs();
555 if (ret < 0)
556 goto out;
557
88dcd2da
NB		 558 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
559 iscsit_global->ts_bitmap = vzalloc(size);
560 if (!iscsit_global->ts_bitmap) {
561 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
e48354ce 562 goto configfs_out;
e48354ce
NB		 563 }
564
e48354ce
NB		 565 lio_qr_cache = kmem_cache_create("lio_qr_cache",
566 sizeof(struct iscsi_queue_req),
567 __alignof__(struct iscsi_queue_req), 0, NULL);
568 if (!lio_qr_cache) {
569 pr_err("nable to kmem_cache_create() for"
570 " lio_qr_cache\n");
88dcd2da 571 goto bitmap_out;
e48354ce
NB		 572 }
573
574 lio_dr_cache = kmem_cache_create("lio_dr_cache",
575 sizeof(struct iscsi_datain_req),
576 __alignof__(struct iscsi_datain_req), 0, NULL);
577 if (!lio_dr_cache) {
578 pr_err("Unable to kmem_cache_create() for"
579 " lio_dr_cache\n");
580 goto qr_out;
581 }
582
583 lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
584 sizeof(struct iscsi_ooo_cmdsn),
585 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
586 if (!lio_ooo_cache) {
587 pr_err("Unable to kmem_cache_create() for"
588 " lio_ooo_cache\n");
589 goto dr_out;
590 }
591
592 lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
593 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
594 0, NULL);
595 if (!lio_r2t_cache) {
596 pr_err("Unable to kmem_cache_create() for"
597 " lio_r2t_cache\n");
598 goto ooo_out;
599 }
600
baa4d64b
NB		 601 iscsit_register_transport(&iscsi_target_transport);
602
e48354ce
NB		 603 if (iscsit_load_discovery_tpg() < 0)
604 goto r2t_out;
605
606 return ret;
607r2t_out:
7f2c53bb 608 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 609 kmem_cache_destroy(lio_r2t_cache);
610ooo_out:
611 kmem_cache_destroy(lio_ooo_cache);
612dr_out:
613 kmem_cache_destroy(lio_dr_cache);
614qr_out:
615 kmem_cache_destroy(lio_qr_cache);
88dcd2da
NB		 616bitmap_out:
617 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 618configfs_out:
619 iscsi_target_deregister_configfs();
620out:
621 kfree(iscsit_global);
622 return -ENOMEM;
623}
624
625static void __exit iscsi_target_cleanup_module(void)
626{
e48354ce 627 iscsit_release_discovery_tpg();
baa4d64b 628 iscsit_unregister_transport(&iscsi_target_transport);
e48354ce
NB		 629 kmem_cache_destroy(lio_qr_cache);
630 kmem_cache_destroy(lio_dr_cache);
631 kmem_cache_destroy(lio_ooo_cache);
632 kmem_cache_destroy(lio_r2t_cache);
633
634 iscsi_target_deregister_configfs();
635
88dcd2da 636 vfree(iscsit_global->ts_bitmap);
e48354ce
NB		 637 kfree(iscsit_global);
638}
639
8b1e1244 640static int iscsit_add_reject(
ba159914 641 struct iscsi_conn *conn,
e48354ce 642 u8 reason,
ba159914 643 unsigned char *buf)
e48354ce
NB		 644{
645 struct iscsi_cmd *cmd;
e48354ce 646
676687c6 647 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
e48354ce
NB		 648 if (!cmd)
649 return -1;
650
651 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 652 cmd->reject_reason = reason;
e48354ce 653
1c3d5794 654 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 655 if (!cmd->buf_ptr) {
656 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 657 iscsit_free_cmd(cmd, false);
e48354ce
NB		 658 return -1;
659 }
e48354ce
NB		 660
661 spin_lock_bh(&conn->cmd_lock);
2fbb471e 662 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 663 spin_unlock_bh(&conn->cmd_lock);
664
665 cmd->i_state = ISTATE_SEND_REJECT;
666 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
667
ba159914 668 return -1;
e48354ce
NB		 669}
670
ba159914
NB		 671static int iscsit_add_reject_from_cmd(
672 struct iscsi_cmd *cmd,
e48354ce 673 u8 reason,
ba159914
NB		 674 bool add_to_conn,
675 unsigned char *buf)
e48354ce
NB		 676{
677 struct iscsi_conn *conn;
e48354ce
NB		 678
679 if (!cmd->conn) {
680 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
681 cmd->init_task_tag);
682 return -1;
683 }
684 conn = cmd->conn;
685
686 cmd->iscsi_opcode = ISCSI_OP_REJECT;
ba159914 687 cmd->reject_reason = reason;
e48354ce 688
1c3d5794 689 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
e48354ce
NB		 690 if (!cmd->buf_ptr) {
691 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
aafc9d15 692 iscsit_free_cmd(cmd, false);
e48354ce
NB		 693 return -1;
694 }
e48354ce
NB		 695
696 if (add_to_conn) {
697 spin_lock_bh(&conn->cmd_lock);
2fbb471e 698 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 699 spin_unlock_bh(&conn->cmd_lock);
700 }
701
702 cmd->i_state = ISTATE_SEND_REJECT;
703 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
3e1c81a9
NB		 704 /*
705 * Perform the kref_put now if se_cmd has already been setup by
706 * scsit_setup_scsi_cmd()
707 */
708 if (cmd->se_cmd.se_tfo != NULL) {
709 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
710 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
711 }
ba159914
NB		 712 return -1;
713}
e48354ce 714
ba159914
NB		 715static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
716 unsigned char *buf)
717{
718 return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
719}
720
721int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
722{
723 return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
e48354ce
NB		 724}
725
726/*
727 * Map some portion of the allocated scatterlist to an iovec, suitable for
bfb79eac 728 * kernel sockets to copy data in/out.
e48354ce
NB		 729 */
730static int iscsit_map_iovec(
731 struct iscsi_cmd *cmd,
732 struct kvec *iov,
733 u32 data_offset,
734 u32 data_length)
735{
736 u32 i = 0;
737 struct scatterlist *sg;
738 unsigned int page_off;
739
740 /*
bfb79eac 741 * We know each entry in t_data_sg contains a page.
e48354ce 742 */
bfb79eac 743 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
e48354ce
NB		 744 page_off = (data_offset % PAGE_SIZE);
745
746 cmd->first_data_sg = sg;
747 cmd->first_data_sg_off = page_off;
748
749 while (data_length) {
750 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
751
752 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
753 iov[i].iov_len = cur_len;
754
755 data_length -= cur_len;
756 page_off = 0;
757 sg = sg_next(sg);
758 i++;
759 }
760
761 cmd->kmapped_nents = i;
762
763 return i;
764}
765
766static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
767{
768 u32 i;
769 struct scatterlist *sg;
770
771 sg = cmd->first_data_sg;
772
773 for (i = 0; i < cmd->kmapped_nents; i++)
774 kunmap(sg_page(&sg[i]));
775}
776
777static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
778{
f56cbbb4
NB		 779 LIST_HEAD(ack_list);
780 struct iscsi_cmd *cmd, *cmd_p;
e48354ce
NB		 781
782 conn->exp_statsn = exp_statsn;
783
3e1c81a9
NB		 784 if (conn->sess->sess_ops->RDMAExtensions)
785 return;
786
e48354ce 787 spin_lock_bh(&conn->cmd_lock);
f56cbbb4 788 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 789 spin_lock(&cmd->istate_lock);
790 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
64c13330 791 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
e48354ce
NB		 792 cmd->i_state = ISTATE_REMOVE;
793 spin_unlock(&cmd->istate_lock);
f56cbbb4 794 list_move_tail(&cmd->i_conn_node, &ack_list);
e48354ce
NB		 795 continue;
796 }
797 spin_unlock(&cmd->istate_lock);
798 }
799 spin_unlock_bh(&conn->cmd_lock);
f56cbbb4
NB		 800
801 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
5159d763 802 list_del_init(&cmd->i_conn_node);
f56cbbb4
NB		 803 iscsit_free_cmd(cmd, false);
804 }
e48354ce
NB		 805}
806
807static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
808{
f80e8ed3 809 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
e48354ce 810
c0427f15 811 iov_count += ISCSI_IOV_DATA_BUFFER;
e48354ce
NB		 812
813 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
814 if (!cmd->iov_data) {
815 pr_err("Unable to allocate cmd->iov_data\n");
816 return -ENOMEM;
817 }
818
819 cmd->orig_iov_data_count = iov_count;
820 return 0;
821}
822
3e1c81a9
NB		 823int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
824 unsigned char *buf)
e48354ce 825{
3e1c81a9 826 int data_direction, payload_length;
e48354ce 827 struct iscsi_scsi_req *hdr;
d28b1169
AG		 828 int iscsi_task_attr;
829 int sam_task_attr;
e48354ce 830
04f3b31b 831 atomic_long_inc(&conn->sess->cmd_pdus);
e48354ce
NB		 832
833 hdr = (struct iscsi_scsi_req *) buf;
834 payload_length = ntoh24(hdr->dlength);
e48354ce
NB		 835
836 /* FIXME; Add checks for AdditionalHeaderSegment */
837
838 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
839 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
840 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
841 " not set. Bad iSCSI Initiator.\n");
ba159914
NB		 842 return iscsit_add_reject_cmd(cmd,
843 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 844 }
845
846 if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
847 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
848 /*
4454b66c
NB		 849 * From RFC-3720 Section 10.3.1:
850 *
851 * "Either or both of R and W MAY be 1 when either the
852 * Expected Data Transfer Length and/or Bidirectional Read
853 * Expected Data Transfer Length are 0"
854 *
855 * For this case, go ahead and clear the unnecssary bits
856 * to avoid any confusion with ->data_direction.
e48354ce 857 */
4454b66c
NB		 858 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
859 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
e48354ce 860
4454b66c 861 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
e48354ce 862 " set when Expected Data Transfer Length is 0 for"
4454b66c 863 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
e48354ce 864 }
e48354ce
NB		 865
866 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
867 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
868 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
869 " MUST be set if Expected Data Transfer Length is not 0."
870 " Bad iSCSI Initiator\n");
ba159914
NB		 871 return iscsit_add_reject_cmd(cmd,
872 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 873 }
874
875 if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
876 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
877 pr_err("Bidirectional operations not supported!\n");
ba159914
NB		 878 return iscsit_add_reject_cmd(cmd,
879 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 880 }
881
882 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
883 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
884 " Scsi Command PDU.\n");
ba159914
NB		 885 return iscsit_add_reject_cmd(cmd,
886 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 887 }
888
889 if (payload_length && !conn->sess->sess_ops->ImmediateData) {
890 pr_err("ImmediateData=No but DataSegmentLength=%u,"
891 " protocol error.\n", payload_length);
ba159914
NB		 892 return iscsit_add_reject_cmd(cmd,
893 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 894 }
895
ba159914 896 if ((be32_to_cpu(hdr->data_length) == payload_length) &&
e48354ce
NB		 897 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
898 pr_err("Expected Data Transfer Length and Length of"
899 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
900 " bit is not set protocol error\n");
ba159914
NB		 901 return iscsit_add_reject_cmd(cmd,
902 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 903 }
904
50e5c87d 905 if (payload_length > be32_to_cpu(hdr->data_length)) {
e48354ce
NB		 906 pr_err("DataSegmentLength: %u is greater than"
907 " EDTL: %u, protocol error.\n", payload_length,
908 hdr->data_length);
ba159914
NB		 909 return iscsit_add_reject_cmd(cmd,
910 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 911 }
912
21f5aa7e 913 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 914 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 915 " MaxXmitDataSegmentLength: %u, protocol error.\n",
916 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 917 return iscsit_add_reject_cmd(cmd,
918 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 919 }
920
921 if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
922 pr_err("DataSegmentLength: %u is greater than"
923 " FirstBurstLength: %u, protocol error.\n",
924 payload_length, conn->sess->sess_ops->FirstBurstLength);
ba159914
NB		 925 return iscsit_add_reject_cmd(cmd,
926 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 927 }
928
929 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
930 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
931 DMA_NONE;
932
d28b1169 933 cmd->data_direction = data_direction;
d28b1169
AG		 934 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
935 /*
936 * Figure out the SAM Task Attribute for the incoming SCSI CDB
937 */
938 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
939 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
68d81f40 940 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169 941 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
68d81f40 942 sam_task_attr = TCM_ORDERED_TAG;
d28b1169 943 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
68d81f40 944 sam_task_attr = TCM_HEAD_TAG;
d28b1169 945 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
68d81f40 946 sam_task_attr = TCM_ACA_TAG;
d28b1169
AG		 947 else {
948 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
68d81f40
CH		 949 " TCM_SIMPLE_TAG\n", iscsi_task_attr);
950 sam_task_attr = TCM_SIMPLE_TAG;
d28b1169
AG		 951 }
952
e48354ce
NB		 953 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD;
954 cmd->i_state = ISTATE_NEW_CMD;
955 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
956 cmd->immediate_data = (payload_length) ? 1 : 0;
957 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
958 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
959 if (cmd->unsolicited_data)
960 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
961
962 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
963 if (hdr->flags & ISCSI_FLAG_CMD_READ) {
c1e34b64 964 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
e48354ce
NB		 965 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
966 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 967 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
968 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 969 cmd->first_burst_len = payload_length;
970
3e1c81a9
NB		 971 if (!conn->sess->sess_ops->RDMAExtensions &&
972 cmd->data_direction == DMA_FROM_DEVICE) {
e48354ce
NB		 973 struct iscsi_datain_req *dr;
974
975 dr = iscsit_allocate_datain_req();
976 if (!dr)
ba159914
NB		 977 return iscsit_add_reject_cmd(cmd,
978 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 979
980 iscsit_attach_datain_req(cmd, dr);
981 }
982
065ca1e4
AG		 983 /*
984 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
985 */
986 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
50e5c87d
CH		 987 conn->sess->se_sess, be32_to_cpu(hdr->data_length),
988 cmd->data_direction, sam_task_attr,
989 cmd->sense_buffer + 2);
065ca1e4
AG		 990
991 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
992 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
3e1c81a9
NB		 993 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
994 conn->cid);
995
996 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
065ca1e4 997
de103c93
CH		 998 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
999 scsilun_to_int(&hdr->lun));
1000 if (cmd->sense_reason)
1001 goto attach_cmd;
1002
1003 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1004 if (cmd->sense_reason) {
1005 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
ba159914
NB		 1006 return iscsit_add_reject_cmd(cmd,
1007 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce 1008 }
de103c93 1009
e48354ce
NB		 1010 goto attach_cmd;
1011 }
a12f41f8 1012
de103c93 1013 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
ba159914
NB		 1014 return iscsit_add_reject_cmd(cmd,
1015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
e48354ce
NB		 1016 }
1017
1018attach_cmd:
1019 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1020 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1021 spin_unlock_bh(&conn->cmd_lock);
1022 /*
1023 * Check if we need to delay processing because of ALUA
1024 * Active/NonOptimized primary access state..
1025 */
1026 core_alua_check_nonop_delay(&cmd->se_cmd);
bfb79eac 1027
3e1c81a9
NB		 1028 return 0;
1029}
1030EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
de103c93 1031
3e1c81a9
NB		 1032void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1033{
1034 iscsit_set_dataout_sequence_values(cmd);
1035
1036 spin_lock_bh(&cmd->dataout_timeout_lock);
1037 iscsit_start_dataout_timer(cmd, cmd->conn);
1038 spin_unlock_bh(&cmd->dataout_timeout_lock);
1039}
1040EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1041
1042int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1043 struct iscsi_scsi_req *hdr)
1044{
1045 int cmdsn_ret = 0;
e48354ce
NB		 1046 /*
1047 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1048 * the Immediate Bit is not set, and no Immediate
1049 * Data is attached.
1050 *
1051 * A PDU/CmdSN carrying Immediate Data can only
1052 * be processed after the DataCRC has passed.
1053 * If the DataCRC fails, the CmdSN MUST NOT
1054 * be acknowledged. (See below)
1055 */
1056 if (!cmd->immediate_data) {
561bf158
NB		 1057 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1058 (unsigned char *)hdr, hdr->cmdsn);
1059 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1060 return -1;
1061 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
3e1c81a9 1062 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
7e32da55 1063 return 0;
3e1c81a9 1064 }
e48354ce
NB		 1065 }
1066
50e5c87d 1067 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 1068
1069 /*
1070 * If no Immediate Data is attached, it's OK to return now.
1071 */
1072 if (!cmd->immediate_data) {
3e1c81a9
NB		 1073 if (!cmd->sense_reason && cmd->unsolicited_data)
1074 iscsit_set_unsoliticed_dataout(cmd);
1075 if (!cmd->sense_reason)
1076 return 0;
e48354ce 1077
3e1c81a9 1078 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
e48354ce
NB		 1079 return 0;
1080 }
1081
1082 /*
3e1c81a9
NB		 1083 * Early CHECK_CONDITIONs with ImmediateData never make it to command
1084 * execution. These exceptions are processed in CmdSN order using
1085 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
e48354ce 1086 */
de103c93 1087 if (cmd->sense_reason) {
561bf158
NB		 1088 if (cmd->reject_reason)
1089 return 0;
1090
3e1c81a9 1091 return 1;
e48354ce
NB		 1092 }
1093 /*
1094 * Call directly into transport_generic_new_cmd() to perform
1095 * the backend memory allocation.
1096 */
de103c93 1097 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
561bf158 1098 if (cmd->sense_reason)
3e1c81a9 1099 return 1;
e48354ce 1100
3e1c81a9
NB		 1101 return 0;
1102}
1103EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1104
1105static int
1106iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1107 bool dump_payload)
1108{
561bf158 1109 struct iscsi_conn *conn = cmd->conn;
3e1c81a9
NB		 1110 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1111 /*
1112 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1113 */
0bcc297e 1114 if (dump_payload)
3e1c81a9
NB		 1115 goto after_immediate_data;
1116
1117 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1118 cmd->first_burst_len);
e48354ce
NB		 1119after_immediate_data:
1120 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1121 /*
1122 * A PDU/CmdSN carrying Immediate Data passed
1123 * DataCRC, check against ExpCmdSN/MaxCmdSN if
1124 * Immediate Bit is not set.
1125 */
561bf158
NB		 1126 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1127 (unsigned char *)hdr, hdr->cmdsn);
9d86a2be 1128 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
561bf158 1129 return -1;
3e1c81a9 1130
9d86a2be 1131 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
561bf158
NB		 1132 int rc;
1133
1134 rc = iscsit_dump_data_payload(cmd->conn,
1135 cmd->first_burst_len, 1);
1136 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1137 return rc;
3e1c81a9
NB		 1138 } else if (cmd->unsolicited_data)
1139 iscsit_set_unsoliticed_dataout(cmd);
e48354ce 1140
e48354ce
NB		 1141 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1142 /*
1143 * Immediate Data failed DataCRC and ERL>=1,
1144 * silently drop this PDU and let the initiator
1145 * plug the CmdSN gap.
1146 *
1147 * FIXME: Send Unsolicited NOPIN with reserved
1148 * TTT here to help the initiator figure out
1149 * the missing CmdSN, although they should be
1150 * intelligent enough to determine the missing
1151 * CmdSN and issue a retry to plug the sequence.
1152 */
1153 cmd->i_state = ISTATE_REMOVE;
3e1c81a9 1154 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
e48354ce
NB		 1155 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1156 return -1;
1157
1158 return 0;
1159}
1160
3e1c81a9
NB		 1161static int
1162iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1163 unsigned char *buf)
1164{
1165 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1166 int rc, immed_data;
1167 bool dump_payload = false;
1168
1169 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1170 if (rc < 0)
561bf158 1171 return 0;
3e1c81a9
NB		 1172 /*
1173 * Allocation iovecs needed for struct socket operations for
1174 * traditional iSCSI block I/O.
1175 */
1176 if (iscsit_allocate_iovecs(cmd) < 0) {
ba159914
NB		 1177 return iscsit_add_reject_cmd(cmd,
1178 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 1179 }
1180 immed_data = cmd->immediate_data;
1181
1182 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1183 if (rc < 0)
1184 return rc;
1185 else if (rc > 0)
1186 dump_payload = true;
1187
1188 if (!immed_data)
1189 return 0;
1190
1191 return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1192}
1193
e48354ce
NB		 1194static u32 iscsit_do_crypto_hash_sg(
1195 struct hash_desc *hash,
1196 struct iscsi_cmd *cmd,
1197 u32 data_offset,
1198 u32 data_length,
1199 u32 padding,
1200 u8 *pad_bytes)
1201{
1202 u32 data_crc;
1203 u32 i;
1204 struct scatterlist *sg;
1205 unsigned int page_off;
1206
1207 crypto_hash_init(hash);
1208
1209 sg = cmd->first_data_sg;
1210 page_off = cmd->first_data_sg_off;
1211
1212 i = 0;
1213 while (data_length) {
1214 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1215
1216 crypto_hash_update(hash, &sg[i], cur_len);
1217
1218 data_length -= cur_len;
1219 page_off = 0;
1220 i++;
1221 }
1222
1223 if (padding) {
1224 struct scatterlist pad_sg;
1225
1226 sg_init_one(&pad_sg, pad_bytes, padding);
1227 crypto_hash_update(hash, &pad_sg, padding);
1228 }
1229 crypto_hash_final(hash, (u8 *) &data_crc);
1230
1231 return data_crc;
1232}
1233
1234static void iscsit_do_crypto_hash_buf(
1235 struct hash_desc *hash,
80690fdb 1236 const void *buf,
e48354ce
NB		 1237 u32 payload_length,
1238 u32 padding,
1239 u8 *pad_bytes,
1240 u8 *data_crc)
1241{
1242 struct scatterlist sg;
1243
1244 crypto_hash_init(hash);
1245
8359cf43 1246 sg_init_one(&sg, buf, payload_length);
e48354ce
NB		 1247 crypto_hash_update(hash, &sg, payload_length);
1248
1249 if (padding) {
1250 sg_init_one(&sg, pad_bytes, padding);
1251 crypto_hash_update(hash, &sg, padding);
1252 }
1253 crypto_hash_final(hash, data_crc);
1254}
1255
3e1c81a9
NB		 1256int
1257iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1258 struct iscsi_cmd **out_cmd)
e48354ce 1259{
3e1c81a9 1260 struct iscsi_data *hdr = (struct iscsi_data *)buf;
e48354ce
NB		 1261 struct iscsi_cmd *cmd = NULL;
1262 struct se_cmd *se_cmd;
3e1c81a9
NB		 1263 u32 payload_length = ntoh24(hdr->dlength);
1264 int rc;
e48354ce
NB		 1265
1266 if (!payload_length) {
dbcbc95c
NB		 1267 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1268 return 0;
e48354ce
NB		 1269 }
1270
1271 /* iSCSI write */
04f3b31b 1272 atomic_long_add(payload_length, &conn->sess->rx_data_octets);
e48354ce 1273
21f5aa7e 1274 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1275 pr_err("DataSegmentLength: %u is greater than"
21f5aa7e
NB		 1276 " MaxXmitDataSegmentLength: %u\n", payload_length,
1277 conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1278 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1279 buf);
e48354ce
NB		 1280 }
1281
1282 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1283 payload_length);
1284 if (!cmd)
1285 return 0;
1286
1287 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1288 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
3e1c81a9 1289 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
e48354ce
NB		 1290 payload_length, conn->cid);
1291
1292 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1293 pr_err("Command ITT: 0x%08x received DataOUT after"
1294 " last DataOUT received, dumping payload\n",
1295 cmd->init_task_tag);
1296 return iscsit_dump_data_payload(conn, payload_length, 1);
1297 }
1298
1299 if (cmd->data_direction != DMA_TO_DEVICE) {
1300 pr_err("Command ITT: 0x%08x received DataOUT for a"
1301 " NON-WRITE command.\n", cmd->init_task_tag);
97c99b47 1302 return iscsit_dump_data_payload(conn, payload_length, 1);
e48354ce
NB		 1303 }
1304 se_cmd = &cmd->se_cmd;
1305 iscsit_mod_dataout_timer(cmd);
1306
50e5c87d 1307 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
e48354ce
NB		 1308 pr_err("DataOut Offset: %u, Length %u greater than"
1309 " iSCSI Command EDTL %u, protocol error.\n",
ebf1d95c 1310 hdr->offset, payload_length, cmd->se_cmd.data_length);
ba159914 1311 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1312 }
1313
1314 if (cmd->unsolicited_data) {
1315 int dump_unsolicited_data = 0;
1316
1317 if (conn->sess->sess_ops->InitialR2T) {
1318 pr_err("Received unexpected unsolicited data"
1319 " while InitialR2T=Yes, protocol error.\n");
1320 transport_send_check_condition_and_sense(&cmd->se_cmd,
1321 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1322 return -1;
1323 }
1324 /*
1325 * Special case for dealing with Unsolicited DataOUT
1326 * and Unsupported SAM WRITE Opcodes and SE resource allocation
1327 * failures;
1328 */
1329
1330 /* Something's amiss if we're not in WRITE_PENDING state... */
e48354ce 1331 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
de103c93 1332 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
e48354ce 1333 dump_unsolicited_data = 1;
e48354ce
NB		 1334
1335 if (dump_unsolicited_data) {
1336 /*
1337 * Check if a delayed TASK_ABORTED status needs to
1338 * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1339 * received with the unsolicitied data out.
1340 */
1341 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1342 iscsit_stop_dataout_timer(cmd);
1343
1344 transport_check_aborted_status(se_cmd,
1345 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1346 return iscsit_dump_data_payload(conn, payload_length, 1);
1347 }
1348 } else {
1349 /*
1350 * For the normal solicited data path:
1351 *
1352 * Check for a delayed TASK_ABORTED status and dump any
1353 * incoming data out payload if one exists. Also, when the
1354 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1355 * data out sequence, we decrement outstanding_r2ts. Once
1356 * outstanding_r2ts reaches zero, go ahead and send the delayed
1357 * TASK_ABORTED status.
1358 */
7d680f3b 1359 if (se_cmd->transport_state & CMD_T_ABORTED) {
e48354ce
NB		 1360 if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1361 if (--cmd->outstanding_r2ts < 1) {
1362 iscsit_stop_dataout_timer(cmd);
1363 transport_check_aborted_status(
1364 se_cmd, 1);
1365 }
1366
1367 return iscsit_dump_data_payload(conn, payload_length, 1);
1368 }
1369 }
1370 /*
1371 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1372 * within-command recovery checks before receiving the payload.
1373 */
3e1c81a9
NB		 1374 rc = iscsit_check_pre_dataout(cmd, buf);
1375 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
e48354ce 1376 return 0;
3e1c81a9 1377 else if (rc == DATAOUT_CANNOT_RECOVER)
e48354ce
NB		 1378 return -1;
1379
3e1c81a9
NB		 1380 *out_cmd = cmd;
1381 return 0;
1382}
1383EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1384
1385static int
1386iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1387 struct iscsi_data *hdr)
1388{
1389 struct kvec *iov;
1390 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1391 u32 payload_length = ntoh24(hdr->dlength);
1392 int iov_ret, data_crc_failed = 0;
1393
e48354ce
NB		 1394 rx_size += payload_length;
1395 iov = &cmd->iov_data[0];
1396
50e5c87d
CH		 1397 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1398 payload_length);
e48354ce
NB		 1399 if (iov_ret < 0)
1400 return -1;
1401
1402 iov_count += iov_ret;
1403
1404 padding = ((-payload_length) & 3);
1405 if (padding != 0) {
1406 iov[iov_count].iov_base = cmd->pad_bytes;
1407 iov[iov_count++].iov_len = padding;
1408 rx_size += padding;
1409 pr_debug("Receiving %u padding bytes.\n", padding);
1410 }
1411
1412 if (conn->conn_ops->DataDigest) {
1413 iov[iov_count].iov_base = &checksum;
1414 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1415 rx_size += ISCSI_CRC_LEN;
1416 }
1417
1418 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1419
1420 iscsit_unmap_iovec(cmd);
1421
1422 if (rx_got != rx_size)
1423 return -1;
1424
1425 if (conn->conn_ops->DataDigest) {
1426 u32 data_crc;
1427
1428 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
50e5c87d
CH		 1429 be32_to_cpu(hdr->offset),
1430 payload_length, padding,
e48354ce
NB		 1431 cmd->pad_bytes);
1432
1433 if (checksum != data_crc) {
1434 pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1435 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1436 " does not match computed 0x%08x\n",
1437 hdr->itt, hdr->offset, payload_length,
1438 hdr->datasn, checksum, data_crc);
1439 data_crc_failed = 1;
1440 } else {
1441 pr_debug("Got CRC32C DataDigest 0x%08x for"
1442 " %u bytes of Data Out\n", checksum,
1443 payload_length);
1444 }
1445 }
3e1c81a9
NB		 1446
1447 return data_crc_failed;
1448}
1449
1450int
1451iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1452 bool data_crc_failed)
1453{
1454 struct iscsi_conn *conn = cmd->conn;
1455 int rc, ooo_cmdsn;
e48354ce
NB		 1456 /*
1457 * Increment post receive data and CRC values or perform
1458 * within-command recovery.
1459 */
3e1c81a9
NB		 1460 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1461 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
e48354ce 1462 return 0;
3e1c81a9 1463 else if (rc == DATAOUT_SEND_R2T) {
e48354ce 1464 iscsit_set_dataout_sequence_values(cmd);
3e1c81a9
NB		 1465 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1466 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
e48354ce
NB		 1467 /*
1468 * Handle extra special case for out of order
1469 * Unsolicited Data Out.
1470 */
1471 spin_lock_bh(&cmd->istate_lock);
1472 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1473 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1474 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1475 spin_unlock_bh(&cmd->istate_lock);
1476
1477 iscsit_stop_dataout_timer(cmd);
67441b68
CH		 1478 if (ooo_cmdsn)
1479 return 0;
1480 target_execute_cmd(&cmd->se_cmd);
1481 return 0;
e48354ce
NB		 1482 } else /* DATAOUT_CANNOT_RECOVER */
1483 return -1;
1484
1485 return 0;
1486}
3e1c81a9 1487EXPORT_SYMBOL(iscsit_check_dataout_payload);
e48354ce 1488
3e1c81a9
NB		 1489static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1490{
dbcbc95c 1491 struct iscsi_cmd *cmd = NULL;
3e1c81a9
NB		 1492 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1493 int rc;
1494 bool data_crc_failed = false;
1495
1496 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1497 if (rc < 0)
561bf158 1498 return 0;
3e1c81a9
NB		 1499 else if (!cmd)
1500 return 0;
1501
1502 rc = iscsit_get_dataout(conn, cmd, hdr);
1503 if (rc < 0)
1504 return rc;
1505 else if (rc > 0)
1506 data_crc_failed = true;
1507
1508 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1509}
1510
778de368
NB		 1511int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1512 struct iscsi_nopout *hdr)
e48354ce 1513{
778de368 1514 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1515
a3662605
AH		 1516 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1517 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1518 if (!cmd)
1519 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1520 (unsigned char *)hdr);
1521
1522 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1523 (unsigned char *)hdr);
1524 }
1525
66c7db68 1526 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
e48354ce
NB		 1527 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1528 " not set, protocol error.\n");
28aaa950
NB		 1529 if (!cmd)
1530 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1531 (unsigned char *)hdr);
1532
ba159914
NB		 1533 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1534 (unsigned char *)hdr);
e48354ce
NB		 1535 }
1536
21f5aa7e 1537 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1538 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
21f5aa7e 1539 " greater than MaxXmitDataSegmentLength: %u, protocol"
e48354ce 1540 " error.\n", payload_length,
21f5aa7e 1541 conn->conn_ops->MaxXmitDataSegmentLength);
28aaa950
NB		 1542 if (!cmd)
1543 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1544 (unsigned char *)hdr);
1545
ba159914
NB		 1546 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1547 (unsigned char *)hdr);
e48354ce
NB		 1548 }
1549
3e1c81a9 1550 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
e48354ce 1551 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
66c7db68 1552 hdr->itt == RESERVED_ITT ? "Response" : "Request",
e48354ce
NB		 1553 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1554 payload_length);
1555 /*
1556 * This is not a response to a Unsolicited NopIN, which means
1557 * it can either be a NOPOUT ping request (with a valid ITT),
1558 * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1559 * Either way, make sure we allocate an struct iscsi_cmd, as both
1560 * can contain ping data.
1561 */
50e5c87d 1562 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
e48354ce
NB		 1563 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT;
1564 cmd->i_state = ISTATE_SEND_NOPIN;
1565 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1566 1 : 0);
1567 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1568 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1569 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1570 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1571 cmd->data_direction = DMA_NONE;
1572 }
1573
778de368
NB		 1574 return 0;
1575}
1576EXPORT_SYMBOL(iscsit_setup_nop_out);
1577
1578int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1579 struct iscsi_nopout *hdr)
1580{
1581 struct iscsi_cmd *cmd_p = NULL;
1582 int cmdsn_ret = 0;
1583 /*
1584 * Initiator is expecting a NopIN ping reply..
1585 */
1586 if (hdr->itt != RESERVED_ITT) {
7cbfcc95
NB		 1587 if (!cmd)
1588 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1589 (unsigned char *)hdr);
778de368
NB		 1590
1591 spin_lock_bh(&conn->cmd_lock);
1592 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1593 spin_unlock_bh(&conn->cmd_lock);
1594
1595 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1596
1597 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1598 iscsit_add_cmd_to_response_queue(cmd, conn,
1599 cmd->i_state);
1600 return 0;
1601 }
1602
561bf158
NB		 1603 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1604 (unsigned char *)hdr, hdr->cmdsn);
778de368
NB		 1605 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1606 return 0;
778de368 1607 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1608 return -1;
778de368
NB		 1609
1610 return 0;
1611 }
1612 /*
1613 * This was a response to a unsolicited NOPIN ping.
1614 */
1615 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1616 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1617 if (!cmd_p)
1618 return -EINVAL;
1619
1620 iscsit_stop_nopin_response_timer(conn);
1621
1622 cmd_p->i_state = ISTATE_REMOVE;
1623 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1624
1625 iscsit_start_nopin_timer(conn);
1626 return 0;
1627 }
1628 /*
1629 * Otherwise, initiator is not expecting a NOPIN is response.
1630 * Just ignore for now.
1631 */
1632 return 0;
1633}
1634EXPORT_SYMBOL(iscsit_process_nop_out);
1635
1636static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1637 unsigned char *buf)
1638{
1639 unsigned char *ping_data = NULL;
1640 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1641 struct kvec *iov = NULL;
1642 u32 payload_length = ntoh24(hdr->dlength);
1643 int ret;
1644
1645 ret = iscsit_setup_nop_out(conn, cmd, hdr);
1646 if (ret < 0)
561bf158 1647 return 0;
778de368
NB		 1648 /*
1649 * Handle NOP-OUT payload for traditional iSCSI sockets
1650 */
50e5c87d 1651 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
778de368
NB		 1652 u32 checksum, data_crc, padding = 0;
1653 int niov = 0, rx_got, rx_size = payload_length;
1654
e48354ce
NB		 1655 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1656 if (!ping_data) {
1657 pr_err("Unable to allocate memory for"
1658 " NOPOUT ping data.\n");
1659 ret = -1;
1660 goto out;
1661 }
1662
1663 iov = &cmd->iov_misc[0];
1664 iov[niov].iov_base = ping_data;
1665 iov[niov++].iov_len = payload_length;
1666
1667 padding = ((-payload_length) & 3);
1668 if (padding != 0) {
1669 pr_debug("Receiving %u additional bytes"
1670 " for padding.\n", padding);
1671 iov[niov].iov_base = &cmd->pad_bytes;
1672 iov[niov++].iov_len = padding;
1673 rx_size += padding;
1674 }
1675 if (conn->conn_ops->DataDigest) {
1676 iov[niov].iov_base = &checksum;
1677 iov[niov++].iov_len = ISCSI_CRC_LEN;
1678 rx_size += ISCSI_CRC_LEN;
1679 }
1680
1681 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1682 if (rx_got != rx_size) {
1683 ret = -1;
1684 goto out;
1685 }
1686
1687 if (conn->conn_ops->DataDigest) {
1688 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1689 ping_data, payload_length,
1690 padding, cmd->pad_bytes,
1691 (u8 *)&data_crc);
1692
1693 if (checksum != data_crc) {
1694 pr_err("Ping data CRC32C DataDigest"
1695 " 0x%08x does not match computed 0x%08x\n",
1696 checksum, data_crc);
1697 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1698 pr_err("Unable to recover from"
1699 " NOPOUT Ping DataCRC failure while in"
1700 " ERL=0.\n");
1701 ret = -1;
1702 goto out;
1703 } else {
1704 /*
1705 * Silently drop this PDU and let the
1706 * initiator plug the CmdSN gap.
1707 */
1708 pr_debug("Dropping NOPOUT"
1709 " Command CmdSN: 0x%08x due to"
1710 " DataCRC error.\n", hdr->cmdsn);
1711 ret = 0;
1712 goto out;
1713 }
1714 } else {
1715 pr_debug("Got CRC32C DataDigest"
1716 " 0x%08x for %u bytes of ping data.\n",
1717 checksum, payload_length);
1718 }
1719 }
1720
1721 ping_data[payload_length] = '\0';
1722 /*
1723 * Attach ping data to struct iscsi_cmd->buf_ptr.
1724 */
8359cf43 1725 cmd->buf_ptr = ping_data;
e48354ce
NB		 1726 cmd->buf_ptr_size = payload_length;
1727
1728 pr_debug("Got %u bytes of NOPOUT ping"
1729 " data.\n", payload_length);
1730 pr_debug("Ping Data: \"%s\"\n", ping_data);
1731 }
1732
778de368 1733 return iscsit_process_nop_out(conn, cmd, hdr);
e48354ce
NB		 1734out:
1735 if (cmd)
aafc9d15 1736 iscsit_free_cmd(cmd, false);
778de368 1737
e48354ce
NB		 1738 kfree(ping_data);
1739 return ret;
1740}
1741
3e1c81a9
NB		 1742int
1743iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1744 unsigned char *buf)
e48354ce 1745{
e48354ce
NB		 1746 struct se_tmr_req *se_tmr;
1747 struct iscsi_tmr_req *tmr_req;
1748 struct iscsi_tm *hdr;
186a9647
NB		 1749 int out_of_order_cmdsn = 0, ret;
1750 bool sess_ref = false;
e48354ce
NB		 1751 u8 function;
1752
1753 hdr = (struct iscsi_tm *) buf;
e48354ce
NB		 1754 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1755 function = hdr->flags;
1756
1757 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1758 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1759 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1760 hdr->rtt, hdr->refcmdsn, conn->cid);
1761
1762 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1763 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
66c7db68 1764 hdr->rtt != RESERVED_ITT)) {
e48354ce 1765 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
66c7db68 1766 hdr->rtt = RESERVED_ITT;
e48354ce
NB		 1767 }
1768
1769 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1770 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1771 pr_err("Task Management Request TASK_REASSIGN not"
1772 " issued as immediate command, bad iSCSI Initiator"
1773 "implementation\n");
ba159914
NB		 1774 return iscsit_add_reject_cmd(cmd,
1775 ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 1776 }
1777 if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
50e5c87d
CH		 1778 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1779 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
e48354ce 1780
d28b1169
AG		 1781 cmd->data_direction = DMA_NONE;
1782
1783 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1784 if (!cmd->tmr_req) {
1785 pr_err("Unable to allocate memory for"
1786 " Task Management command!\n");
ba159914
NB		 1787 return iscsit_add_reject_cmd(cmd,
1788 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1789 buf);
d28b1169
AG		 1790 }
1791
1792 /*
1793 * TASK_REASSIGN for ERL=2 / connection stays inside of
1794 * LIO-Target $FABRIC_MOD
1795 */
1796 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1797
1798 u8 tcm_function;
1799 int ret;
1800
1801 transport_init_se_cmd(&cmd->se_cmd,
1802 &lio_target_fabric_configfs->tf_ops,
1803 conn->sess->se_sess, 0, DMA_NONE,
68d81f40 1804 TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
d28b1169 1805
186a9647
NB		 1806 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1807 sess_ref = true;
1808
d28b1169
AG		 1809 switch (function) {
1810 case ISCSI_TM_FUNC_ABORT_TASK:
1811 tcm_function = TMR_ABORT_TASK;
1812 break;
1813 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1814 tcm_function = TMR_ABORT_TASK_SET;
1815 break;
1816 case ISCSI_TM_FUNC_CLEAR_ACA:
1817 tcm_function = TMR_CLEAR_ACA;
1818 break;
1819 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1820 tcm_function = TMR_CLEAR_TASK_SET;
1821 break;
1822 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1823 tcm_function = TMR_LUN_RESET;
1824 break;
1825 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1826 tcm_function = TMR_TARGET_WARM_RESET;
1827 break;
1828 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1829 tcm_function = TMR_TARGET_COLD_RESET;
1830 break;
1831 default:
1832 pr_err("Unknown iSCSI TMR Function:"
1833 " 0x%02x\n", function);
ba159914
NB		 1834 return iscsit_add_reject_cmd(cmd,
1835 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1836 }
1837
1838 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1839 tcm_function, GFP_KERNEL);
1840 if (ret < 0)
ba159914
NB		 1841 return iscsit_add_reject_cmd(cmd,
1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
d28b1169
AG		 1843
1844 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1845 }
e48354ce
NB		 1846
1847 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC;
1848 cmd->i_state = ISTATE_SEND_TASKMGTRSP;
1849 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1850 cmd->init_task_tag = hdr->itt;
1851 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 1852 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1853 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
e48354ce
NB		 1854 se_tmr = cmd->se_cmd.se_tmr_req;
1855 tmr_req = cmd->tmr_req;
1856 /*
1857 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1858 */
1859 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
4f26998a
AG		 1860 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1861 scsilun_to_int(&hdr->lun));
e48354ce 1862 if (ret < 0) {
e48354ce
NB		 1863 se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1864 goto attach;
1865 }
1866 }
1867
1868 switch (function) {
1869 case ISCSI_TM_FUNC_ABORT_TASK:
1870 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
de103c93 1871 if (se_tmr->response)
e48354ce 1872 goto attach;
e48354ce
NB		 1873 break;
1874 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1875 case ISCSI_TM_FUNC_CLEAR_ACA:
1876 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1877 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1878 break;
1879 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1880 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1881 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1882 goto attach;
1883 }
1884 break;
1885 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1886 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
e48354ce
NB		 1887 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1888 goto attach;
1889 }
1890 break;
1891 case ISCSI_TM_FUNC_TASK_REASSIGN:
1892 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1893 /*
1894 * Perform sanity checks on the ExpDataSN only if the
1895 * TASK_REASSIGN was successful.
1896 */
de103c93 1897 if (se_tmr->response)
e48354ce
NB		 1898 break;
1899
1900 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
ba159914
NB		 1901 return iscsit_add_reject_cmd(cmd,
1902 ISCSI_REASON_BOOKMARK_INVALID, buf);
e48354ce
NB		 1903 break;
1904 default:
1905 pr_err("Unknown TMR function: 0x%02x, protocol"
1906 " error.\n", function);
e48354ce
NB		 1907 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1908 goto attach;
1909 }
1910
1911 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1912 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1913 se_tmr->call_transport = 1;
1914attach:
1915 spin_lock_bh(&conn->cmd_lock);
2fbb471e 1916 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 1917 spin_unlock_bh(&conn->cmd_lock);
1918
1919 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158 1920 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
e48354ce
NB		 1921 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1922 out_of_order_cmdsn = 1;
5a4c8666 1923 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 1924 return 0;
5a4c8666 1925 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914 1926 return -1;
e48354ce 1927 }
50e5c87d 1928 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce 1929
5a4c8666 1930 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
e48354ce
NB		 1931 return 0;
1932 /*
1933 * Found the referenced task, send to transport for processing.
1934 */
1935 if (se_tmr->call_transport)
1936 return transport_generic_handle_tmr(&cmd->se_cmd);
1937
1938 /*
1939 * Could not find the referenced LUN, task, or Task Management
1940 * command not authorized or supported. Change state and
1941 * let the tx_thread send the response.
1942 *
1943 * For connection recovery, this is also the default action for
1944 * TMR TASK_REASSIGN.
1945 */
186a9647
NB		 1946 if (sess_ref) {
1947 pr_debug("Handle TMR, using sess_ref=true check\n");
1948 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1949 }
1950
e48354ce
NB		 1951 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1952 return 0;
1953}
3e1c81a9 1954EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
e48354ce
NB		 1955
1956/* #warning FIXME: Support Text Command parameters besides SendTargets */
64534aa7
NB		 1957int
1958iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1959 struct iscsi_text *hdr)
e48354ce 1960{
64534aa7 1961 u32 payload_length = ntoh24(hdr->dlength);
e48354ce 1962
21f5aa7e 1963 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
e48354ce 1964 pr_err("Unable to accept text parameter length: %u"
21f5aa7e
NB		 1965 "greater than MaxXmitDataSegmentLength %u.\n",
1966 payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
ba159914
NB		 1967 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1968 (unsigned char *)hdr);
e48354ce
NB		 1969 }
1970
122f8afc
NB		 1971 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1972 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1973 pr_err("Multi sequence text commands currently not supported\n");
1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1975 (unsigned char *)hdr);
1976 }
1977
e48354ce
NB		 1978 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1979 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1980 hdr->exp_statsn, payload_length);
1981
64534aa7
NB		 1982 cmd->iscsi_opcode = ISCSI_OP_TEXT;
1983 cmd->i_state = ISTATE_SEND_TEXTRSP;
1984 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1985 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1986 cmd->targ_xfer_tag = 0xFFFFFFFF;
1987 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
1988 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
1989 cmd->data_direction = DMA_NONE;
e4f4e801 1990 cmd->text_in_ptr = NULL;
64534aa7
NB		 1991
1992 return 0;
1993}
1994EXPORT_SYMBOL(iscsit_setup_text_cmd);
1995
1996int
1997iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1998 struct iscsi_text *hdr)
1999{
9864ca9d 2000 unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
64534aa7
NB		 2001 int cmdsn_ret;
2002
9864ca9d 2003 if (!text_in) {
e4f4e801
SG		 2004 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2005 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2006 pr_err("Unable to locate text_in buffer for sendtargets"
2007 " discovery\n");
2008 goto reject;
2009 }
2010 goto empty_sendtargets;
9864ca9d
NB		 2011 }
2012 if (strncmp("SendTargets", text_in, 11) != 0) {
2013 pr_err("Received Text Data that is not"
2014 " SendTargets, cannot continue.\n");
2015 goto reject;
2016 }
2017 text_ptr = strchr(text_in, '=');
2018 if (!text_ptr) {
2019 pr_err("No \"=\" separator found in Text Data,"
2020 " cannot continue.\n");
2021 goto reject;
2022 }
2023 if (!strncmp("=All", text_ptr, 4)) {
8060b8dd 2024 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
6665889c
NB		 2025 } else if (!strncmp("=iqn.", text_ptr, 5) ||
2026 !strncmp("=eui.", text_ptr, 5)) {
8060b8dd 2027 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
9864ca9d
NB		 2028 } else {
2029 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2030 goto reject;
2031 }
2032
64534aa7
NB		 2033 spin_lock_bh(&conn->cmd_lock);
2034 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2035 spin_unlock_bh(&conn->cmd_lock);
2036
e4f4e801 2037empty_sendtargets:
64534aa7
NB		 2038 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2039
2040 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
561bf158
NB		 2041 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2042 (unsigned char *)hdr, hdr->cmdsn);
64534aa7 2043 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
ba159914
NB		 2044 return -1;
2045
64534aa7
NB		 2046 return 0;
2047 }
2048
2049 return iscsit_execute_cmd(cmd, 0);
9864ca9d
NB		 2050
2051reject:
ba159914
NB		 2052 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2053 (unsigned char *)hdr);
64534aa7
NB		 2054}
2055EXPORT_SYMBOL(iscsit_process_text_cmd);
2056
2057static int
2058iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2059 unsigned char *buf)
2060{
2061 struct iscsi_text *hdr = (struct iscsi_text *)buf;
2062 char *text_in = NULL;
2063 u32 payload_length = ntoh24(hdr->dlength);
2064 int rx_size, rc;
2065
2066 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2067 if (rc < 0)
561bf158 2068 return 0;
64534aa7
NB		 2069
2070 rx_size = payload_length;
2071 if (payload_length) {
64534aa7
NB		 2072 u32 checksum = 0, data_crc = 0;
2073 u32 padding = 0, pad_bytes = 0;
2074 int niov = 0, rx_got;
2075 struct kvec iov[3];
2076
2077 text_in = kzalloc(payload_length, GFP_KERNEL);
e48354ce
NB		 2078 if (!text_in) {
2079 pr_err("Unable to allocate memory for"
2080 " incoming text parameters\n");
64534aa7 2081 goto reject;
e48354ce 2082 }
9864ca9d 2083 cmd->text_in_ptr = text_in;
e48354ce
NB		 2084
2085 memset(iov, 0, 3 * sizeof(struct kvec));
2086 iov[niov].iov_base = text_in;
64534aa7 2087 iov[niov++].iov_len = payload_length;
e48354ce
NB		 2088
2089 padding = ((-payload_length) & 3);
2090 if (padding != 0) {
76f1928e 2091 iov[niov].iov_base = &pad_bytes;
e48354ce
NB		 2092 iov[niov++].iov_len = padding;
2093 rx_size += padding;
2094 pr_debug("Receiving %u additional bytes"
2095 " for padding.\n", padding);
2096 }
2097 if (conn->conn_ops->DataDigest) {
2098 iov[niov].iov_base = &checksum;
2099 iov[niov++].iov_len = ISCSI_CRC_LEN;
2100 rx_size += ISCSI_CRC_LEN;
2101 }
2102
2103 rx_got = rx_data(conn, &iov[0], niov, rx_size);
64534aa7
NB		 2104 if (rx_got != rx_size)
2105 goto reject;
e48354ce
NB		 2106
2107 if (conn->conn_ops->DataDigest) {
2108 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
64534aa7 2109 text_in, payload_length,
76f1928e 2110 padding, (u8 *)&pad_bytes,
e48354ce
NB		 2111 (u8 *)&data_crc);
2112
2113 if (checksum != data_crc) {
2114 pr_err("Text data CRC32C DataDigest"
2115 " 0x%08x does not match computed"
2116 " 0x%08x\n", checksum, data_crc);
2117 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2118 pr_err("Unable to recover from"
2119 " Text Data digest failure while in"
2120 " ERL=0.\n");
64534aa7 2121 goto reject;
e48354ce
NB		 2122 } else {
2123 /*
2124 * Silently drop this PDU and let the
2125 * initiator plug the CmdSN gap.
2126 */
2127 pr_debug("Dropping Text"
2128 " Command CmdSN: 0x%08x due to"
2129 " DataCRC error.\n", hdr->cmdsn);
2130 kfree(text_in);
2131 return 0;
2132 }
2133 } else {
2134 pr_debug("Got CRC32C DataDigest"
2135 " 0x%08x for %u bytes of text data.\n",
64534aa7 2136 checksum, payload_length);
e48354ce
NB		 2137 }
2138 }
64534aa7 2139 text_in[payload_length - 1] = '\0';
e48354ce 2140 pr_debug("Successfully read %d bytes of text"
64534aa7 2141 " data.\n", payload_length);
e48354ce
NB		 2142 }
2143
64534aa7 2144 return iscsit_process_text_cmd(conn, cmd, hdr);
e48354ce 2145
64534aa7 2146reject:
9864ca9d
NB		 2147 kfree(cmd->text_in_ptr);
2148 cmd->text_in_ptr = NULL;
ba159914 2149 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
e48354ce
NB		 2150}
2151
2152int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2153{
2154 struct iscsi_conn *conn_p;
2155 struct iscsi_session *sess = conn->sess;
2156
2157 pr_debug("Received logout request CLOSESESSION on CID: %hu"
2158 " for SID: %u.\n", conn->cid, conn->sess->sid);
2159
2160 atomic_set(&sess->session_logout, 1);
2161 atomic_set(&conn->conn_logout_remove, 1);
2162 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2163
2164 iscsit_inc_conn_usage_count(conn);
2165 iscsit_inc_session_usage_count(sess);
2166
2167 spin_lock_bh(&sess->conn_lock);
2168 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2169 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2170 continue;
2171
2172 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2173 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2174 }
2175 spin_unlock_bh(&sess->conn_lock);
2176
2177 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2178
2179 return 0;
2180}
2181
2182int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2183{
2184 struct iscsi_conn *l_conn;
2185 struct iscsi_session *sess = conn->sess;
2186
2187 pr_debug("Received logout request CLOSECONNECTION for CID:"
2188 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2189
2190 /*
2191 * A Logout Request with a CLOSECONNECTION reason code for a CID
2192 * can arrive on a connection with a differing CID.
2193 */
2194 if (conn->cid == cmd->logout_cid) {
2195 spin_lock_bh(&conn->state_lock);
2196 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2197 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2198
2199 atomic_set(&conn->conn_logout_remove, 1);
2200 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2201 iscsit_inc_conn_usage_count(conn);
2202
2203 spin_unlock_bh(&conn->state_lock);
2204 } else {
2205 /*
2206 * Handle all different cid CLOSECONNECTION requests in
2207 * iscsit_logout_post_handler_diffcid() as to give enough
2208 * time for any non immediate command's CmdSN to be
2209 * acknowledged on the connection in question.
2210 *
2211 * Here we simply make sure the CID is still around.
2212 */
2213 l_conn = iscsit_get_conn_from_cid(sess,
2214 cmd->logout_cid);
2215 if (!l_conn) {
2216 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2217 iscsit_add_cmd_to_response_queue(cmd, conn,
2218 cmd->i_state);
2219 return 0;
2220 }
2221
2222 iscsit_dec_conn_usage_count(l_conn);
2223 }
2224
2225 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2226
2227 return 0;
2228}
2229
2230int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2231{
2232 struct iscsi_session *sess = conn->sess;
2233
2234 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2235 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2236
2237 if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2238 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2239 " while ERL!=2.\n");
2240 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2241 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2242 return 0;
2243 }
2244
2245 if (conn->cid == cmd->logout_cid) {
2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2247 " with CID: %hu on CID: %hu, implementation error.\n",
2248 cmd->logout_cid, conn->cid);
2249 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2250 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2251 return 0;
2252 }
2253
2254 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2255
2256 return 0;
2257}
2258
3e1c81a9
NB		 2259int
2260iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2261 unsigned char *buf)
e48354ce
NB		 2262{
2263 int cmdsn_ret, logout_remove = 0;
2264 u8 reason_code = 0;
e48354ce
NB		 2265 struct iscsi_logout *hdr;
2266 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2267
2268 hdr = (struct iscsi_logout *) buf;
2269 reason_code = (hdr->flags & 0x7f);
e48354ce
NB		 2270
2271 if (tiqn) {
2272 spin_lock(&tiqn->logout_stats.lock);
2273 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2274 tiqn->logout_stats.normal_logouts++;
2275 else
2276 tiqn->logout_stats.abnormal_logouts++;
2277 spin_unlock(&tiqn->logout_stats.lock);
2278 }
2279
2280 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2281 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2282 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2283 hdr->cid, conn->cid);
2284
2285 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2286 pr_err("Received logout request on connection that"
2287 " is not in logged in state, ignoring request.\n");
aafc9d15 2288 iscsit_free_cmd(cmd, false);
e48354ce
NB		 2289 return 0;
2290 }
2291
e48354ce
NB		 2292 cmd->iscsi_opcode = ISCSI_OP_LOGOUT;
2293 cmd->i_state = ISTATE_SEND_LOGOUTRSP;
2294 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2295 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
2296 cmd->targ_xfer_tag = 0xFFFFFFFF;
50e5c87d
CH		 2297 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn);
2298 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn);
2299 cmd->logout_cid = be16_to_cpu(hdr->cid);
e48354ce
NB		 2300 cmd->logout_reason = reason_code;
2301 cmd->data_direction = DMA_NONE;
2302
2303 /*
2304 * We need to sleep in these cases (by returning 1) until the Logout
2305 * Response gets sent in the tx thread.
2306 */
2307 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2308 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
50e5c87d 2309 be16_to_cpu(hdr->cid) == conn->cid))
e48354ce
NB		 2310 logout_remove = 1;
2311
2312 spin_lock_bh(&conn->cmd_lock);
2fbb471e 2313 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 2314 spin_unlock_bh(&conn->cmd_lock);
2315
2316 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
50e5c87d 2317 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
e48354ce
NB		 2318
2319 /*
2320 * Immediate commands are executed, well, immediately.
2321 * Non-Immediate Logout Commands are executed in CmdSN order.
2322 */
c6037cc5 2323 if (cmd->immediate_cmd) {
e48354ce
NB		 2324 int ret = iscsit_execute_cmd(cmd, 0);
2325
2326 if (ret < 0)
2327 return ret;
2328 } else {
561bf158 2329 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
ba159914 2330 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
e48354ce 2331 logout_remove = 0;
ba159914
NB		 2332 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2333 return -1;
e48354ce
NB		 2334 }
2335
2336 return logout_remove;
2337}
3e1c81a9 2338EXPORT_SYMBOL(iscsit_handle_logout_cmd);
e48354ce
NB		 2339
2340static int iscsit_handle_snack(
2341 struct iscsi_conn *conn,
2342 unsigned char *buf)
2343{
e48354ce
NB		 2344 struct iscsi_snack *hdr;
2345
2346 hdr = (struct iscsi_snack *) buf;
2347 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
e48354ce
NB		 2348
2349 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2350 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2351 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2352 hdr->begrun, hdr->runlength, conn->cid);
2353
2354 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2355 pr_err("Initiator sent SNACK request while in"
2356 " ErrorRecoveryLevel=0.\n");
ba159914
NB		 2357 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2358 buf);
e48354ce
NB		 2359 }
2360 /*
2361 * SNACK_DATA and SNACK_R2T are both 0, so check which function to
2362 * call from inside iscsi_send_recovery_datain_or_r2t().
2363 */
2364 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2365 case 0:
2366 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
50e5c87d
CH		 2367 hdr->itt,
2368 be32_to_cpu(hdr->ttt),
2369 be32_to_cpu(hdr->begrun),
2370 be32_to_cpu(hdr->runlength));
e48354ce 2371 case ISCSI_FLAG_SNACK_TYPE_STATUS:
50e5c87d
CH		 2372 return iscsit_handle_status_snack(conn, hdr->itt,
2373 be32_to_cpu(hdr->ttt),
2374 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
e48354ce 2375 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
50e5c87d
CH		 2376 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2377 be32_to_cpu(hdr->begrun),
2378 be32_to_cpu(hdr->runlength));
e48354ce
NB		 2379 case ISCSI_FLAG_SNACK_TYPE_RDATA:
2380 /* FIXME: Support R-Data SNACK */
2381 pr_err("R-Data SNACK Not Supported.\n");
ba159914
NB		 2382 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2383 buf);
e48354ce
NB		 2384 default:
2385 pr_err("Unknown SNACK type 0x%02x, protocol"
2386 " error.\n", hdr->flags & 0x0f);
ba159914
NB		 2387 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2388 buf);
e48354ce
NB		 2389 }
2390
2391 return 0;
2392}
2393
2394static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2395{
2396 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2397 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2398 wait_for_completion_interruptible_timeout(
2399 &conn->rx_half_close_comp,
2400 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2401 }
2402}
2403
2404static int iscsit_handle_immediate_data(
2405 struct iscsi_cmd *cmd,
3e1c81a9 2406 struct iscsi_scsi_req *hdr,
e48354ce
NB		 2407 u32 length)
2408{
2409 int iov_ret, rx_got = 0, rx_size = 0;
2410 u32 checksum, iov_count = 0, padding = 0;
2411 struct iscsi_conn *conn = cmd->conn;
2412 struct kvec *iov;
2413
2414 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2415 if (iov_ret < 0)
2416 return IMMEDIATE_DATA_CANNOT_RECOVER;
2417
2418 rx_size = length;
2419 iov_count = iov_ret;
2420 iov = &cmd->iov_data[0];
2421
2422 padding = ((-length) & 3);
2423 if (padding != 0) {
2424 iov[iov_count].iov_base = cmd->pad_bytes;
2425 iov[iov_count++].iov_len = padding;
2426 rx_size += padding;
2427 }
2428
2429 if (conn->conn_ops->DataDigest) {
2430 iov[iov_count].iov_base = &checksum;
2431 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2432 rx_size += ISCSI_CRC_LEN;
2433 }
2434
2435 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2436
2437 iscsit_unmap_iovec(cmd);
2438
2439 if (rx_got != rx_size) {
2440 iscsit_rx_thread_wait_for_tcp(conn);
2441 return IMMEDIATE_DATA_CANNOT_RECOVER;
2442 }
2443
2444 if (conn->conn_ops->DataDigest) {
2445 u32 data_crc;
2446
2447 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2448 cmd->write_data_done, length, padding,
2449 cmd->pad_bytes);
2450
2451 if (checksum != data_crc) {
2452 pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2453 " does not match computed 0x%08x\n", checksum,
2454 data_crc);
2455
2456 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2457 pr_err("Unable to recover from"
2458 " Immediate Data digest failure while"
2459 " in ERL=0.\n");
ba159914 2460 iscsit_reject_cmd(cmd,
e48354ce 2461 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2462 (unsigned char *)hdr);
e48354ce
NB		 2463 return IMMEDIATE_DATA_CANNOT_RECOVER;
2464 } else {
ba159914 2465 iscsit_reject_cmd(cmd,
e48354ce 2466 ISCSI_REASON_DATA_DIGEST_ERROR,
ba159914 2467 (unsigned char *)hdr);
e48354ce
NB		 2468 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2469 }
2470 } else {
2471 pr_debug("Got CRC32C DataDigest 0x%08x for"
2472 " %u bytes of Immediate Data\n", checksum,
2473 length);
2474 }
2475 }
2476
2477 cmd->write_data_done += length;
2478
ebf1d95c 2479 if (cmd->write_data_done == cmd->se_cmd.data_length) {
e48354ce
NB		 2480 spin_lock_bh(&cmd->istate_lock);
2481 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2482 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2483 spin_unlock_bh(&cmd->istate_lock);
2484 }
2485
2486 return IMMEDIATE_DATA_NORMAL_OPERATION;
2487}
2488
2489/*
2490 * Called with sess->conn_lock held.
2491 */
2492/* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2493 with active network interface */
2494static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2495{
2496 struct iscsi_cmd *cmd;
2497 struct iscsi_conn *conn_p;
d444edc6 2498 bool found = false;
e48354ce
NB		 2499
2500 /*
2501 * Only send a Asynchronous Message on connections whos network
2502 * interface is still functional.
2503 */
2504 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2505 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2506 iscsit_inc_conn_usage_count(conn_p);
d444edc6 2507 found = true;
e48354ce
NB		 2508 break;
2509 }
2510 }
2511
d444edc6 2512 if (!found)
e48354ce
NB		 2513 return;
2514
676687c6 2515 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
e48354ce
NB		 2516 if (!cmd) {
2517 iscsit_dec_conn_usage_count(conn_p);
2518 return;
2519 }
2520
2521 cmd->logout_cid = conn->cid;
2522 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2523 cmd->i_state = ISTATE_SEND_ASYNCMSG;
2524
2525 spin_lock_bh(&conn_p->cmd_lock);
2fbb471e 2526 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
e48354ce
NB		 2527 spin_unlock_bh(&conn_p->cmd_lock);
2528
2529 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2530 iscsit_dec_conn_usage_count(conn_p);
2531}
2532
2533static int iscsit_send_conn_drop_async_message(
2534 struct iscsi_cmd *cmd,
2535 struct iscsi_conn *conn)
2536{
2537 struct iscsi_async *hdr;
2538
2539 cmd->tx_size = ISCSI_HDR_LEN;
2540 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2541
2542 hdr = (struct iscsi_async *) cmd->pdu;
2543 hdr->opcode = ISCSI_OP_ASYNC_EVENT;
2544 hdr->flags = ISCSI_FLAG_CMD_FINAL;
66c7db68 2545 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 2546 cmd->targ_xfer_tag = 0xFFFFFFFF;
2547 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2548 cmd->stat_sn = conn->stat_sn++;
2549 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2550 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2551 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2552 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2553 hdr->param1 = cpu_to_be16(cmd->logout_cid);
2554 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2555 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2556
2557 if (conn->conn_ops->HeaderDigest) {
2558 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2559
80690fdb
GU		 2560 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2561 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2562
2563 cmd->tx_size += ISCSI_CRC_LEN;
2564 pr_debug("Attaching CRC32C HeaderDigest to"
2565 " Async Message 0x%08x\n", *header_digest);
2566 }
2567
2568 cmd->iov_misc[0].iov_base = cmd->pdu;
2569 cmd->iov_misc[0].iov_len = cmd->tx_size;
2570 cmd->iov_misc_count = 1;
2571
2572 pr_debug("Sending Connection Dropped Async Message StatSN:"
2573 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2574 cmd->logout_cid, conn->cid);
2575 return 0;
2576}
2577
6f3c0e69
AG		 2578static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2579{
2580 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2581 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2582 wait_for_completion_interruptible_timeout(
2583 &conn->tx_half_close_comp,
2584 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2585 }
2586}
2587
2ec5a8c1
NB		 2588static void
2589iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2590 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2591 bool set_statsn)
e48354ce 2592{
2ec5a8c1
NB		 2593 hdr->opcode = ISCSI_OP_SCSI_DATA_IN;
2594 hdr->flags = datain->flags;
2595 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2596 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2597 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2598 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2599 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2600 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2601 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2602 }
2603 }
2604 hton24(hdr->dlength, datain->length);
2605 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2606 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2607 (struct scsi_lun *)&hdr->lun);
2608 else
2609 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2610
2611 hdr->itt = cmd->init_task_tag;
2612
2613 if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2614 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2615 else
2616 hdr->ttt = cpu_to_be32(0xFFFFFFFF);
2617 if (set_statsn)
2618 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2619 else
2620 hdr->statsn = cpu_to_be32(0xFFFFFFFF);
2621
2622 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2623 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2624 hdr->datasn = cpu_to_be32(datain->data_sn);
2625 hdr->offset = cpu_to_be32(datain->offset);
2626
2627 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2628 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2629 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2630 ntohl(hdr->offset), datain->length, conn->cid);
2631}
2632
2633static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2634{
2635 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
e48354ce
NB		 2636 struct iscsi_datain datain;
2637 struct iscsi_datain_req *dr;
e48354ce 2638 struct kvec *iov;
2ec5a8c1
NB		 2639 u32 iov_count = 0, tx_size = 0;
2640 int eodr = 0, ret, iov_ret;
2641 bool set_statsn = false;
e48354ce
NB		 2642
2643 memset(&datain, 0, sizeof(struct iscsi_datain));
2644 dr = iscsit_get_datain_values(cmd, &datain);
2645 if (!dr) {
2646 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2647 cmd->init_task_tag);
2648 return -1;
2649 }
e48354ce
NB		 2650 /*
2651 * Be paranoid and double check the logic for now.
2652 */
ebf1d95c 2653 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
e48354ce
NB		 2654 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2655 " datain.length: %u exceeds cmd->data_length: %u\n",
2656 cmd->init_task_tag, datain.offset, datain.length,
2ec5a8c1 2657 cmd->se_cmd.data_length);
e48354ce
NB		 2658 return -1;
2659 }
2660
04f3b31b 2661 atomic_long_add(datain.length, &conn->sess->tx_data_octets);
e48354ce
NB		 2662 /*
2663 * Special case for successfully execution w/ both DATAIN
2664 * and Sense Data.
2665 */
2666 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2667 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2668 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2669 else {
2670 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2671 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2672 iscsit_increment_maxcmdsn(cmd, conn->sess);
2673 cmd->stat_sn = conn->stat_sn++;
2ec5a8c1 2674 set_statsn = true;
e48354ce 2675 } else if (dr->dr_complete ==
2ec5a8c1
NB		 2676 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2677 set_statsn = true;
e48354ce
NB		 2678 }
2679
2ec5a8c1 2680 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
e48354ce
NB		 2681
2682 iov = &cmd->iov_data[0];
2683 iov[iov_count].iov_base = cmd->pdu;
2684 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
2685 tx_size += ISCSI_HDR_LEN;
2686
2687 if (conn->conn_ops->HeaderDigest) {
2688 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2689
80690fdb
GU		 2690 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2691 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2692
2693 iov[0].iov_len += ISCSI_CRC_LEN;
2694 tx_size += ISCSI_CRC_LEN;
2695
2696 pr_debug("Attaching CRC32 HeaderDigest"
2697 " for DataIN PDU 0x%08x\n", *header_digest);
2698 }
2699
2ec5a8c1
NB		 2700 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2701 datain.offset, datain.length);
e48354ce
NB		 2702 if (iov_ret < 0)
2703 return -1;
2704
2705 iov_count += iov_ret;
2706 tx_size += datain.length;
2707
2708 cmd->padding = ((-datain.length) & 3);
2709 if (cmd->padding) {
2710 iov[iov_count].iov_base = cmd->pad_bytes;
2711 iov[iov_count++].iov_len = cmd->padding;
2712 tx_size += cmd->padding;
2713
2714 pr_debug("Attaching %u padding bytes\n",
2715 cmd->padding);
2716 }
2717 if (conn->conn_ops->DataDigest) {
2718 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2719 datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2720
2721 iov[iov_count].iov_base = &cmd->data_crc;
2722 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2723 tx_size += ISCSI_CRC_LEN;
2724
2725 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2726 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2727 }
2728
2729 cmd->iov_data_count = iov_count;
2730 cmd->tx_size = tx_size;
2731
6f3c0e69
AG		 2732 /* sendpage is preferred but can't insert markers */
2733 if (!conn->conn_ops->IFMarker)
2734 ret = iscsit_fe_sendpage_sg(cmd, conn);
2735 else
2736 ret = iscsit_send_tx_data(cmd, conn, 0);
2737
2738 iscsit_unmap_iovec(cmd);
2739
2740 if (ret < 0) {
2741 iscsit_tx_thread_wait_for_tcp(conn);
2742 return ret;
2743 }
2744
e48354ce 2745 if (dr->dr_complete) {
6f3c0e69 2746 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
e48354ce
NB		 2747 2 : 1;
2748 iscsit_free_datain_req(cmd, dr);
2749 }
2750
6f3c0e69 2751 return eodr;
e48354ce
NB		 2752}
2753
2ec5a8c1
NB		 2754int
2755iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2756 struct iscsi_logout_rsp *hdr)
e48354ce 2757{
e48354ce
NB		 2758 struct iscsi_conn *logout_conn = NULL;
2759 struct iscsi_conn_recovery *cr = NULL;
2760 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 2761 /*
2762 * The actual shutting down of Sessions and/or Connections
2763 * for CLOSESESSION and CLOSECONNECTION Logout Requests
2764 * is done in scsi_logout_post_handler().
2765 */
2766 switch (cmd->logout_reason) {
2767 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2768 pr_debug("iSCSI session logout successful, setting"
2769 " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2770 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2771 break;
2772 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2773 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2774 break;
2775 /*
2776 * For CLOSECONNECTION logout requests carrying
2777 * a matching logout CID -> local CID, the reference
2778 * for the local CID will have been incremented in
2779 * iscsi_logout_closeconnection().
2780 *
2781 * For CLOSECONNECTION logout requests carrying
2782 * a different CID than the connection it arrived
2783 * on, the connection responding to cmd->logout_cid
2784 * is stopped in iscsit_logout_post_handler_diffcid().
2785 */
2786
2787 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2788 " successful.\n", cmd->logout_cid, conn->cid);
2789 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2790 break;
2791 case ISCSI_LOGOUT_REASON_RECOVERY:
2792 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2793 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2794 break;
2795 /*
2796 * If the connection is still active from our point of view
2797 * force connection recovery to occur.
2798 */
2799 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2800 cmd->logout_cid);
ee1b1b9c 2801 if (logout_conn) {
e48354ce
NB		 2802 iscsit_connection_reinstatement_rcfr(logout_conn);
2803 iscsit_dec_conn_usage_count(logout_conn);
2804 }
2805
2806 cr = iscsit_get_inactive_connection_recovery_entry(
2807 conn->sess, cmd->logout_cid);
2808 if (!cr) {
2809 pr_err("Unable to locate CID: %hu for"
2810 " REMOVECONNFORRECOVERY Logout Request.\n",
2811 cmd->logout_cid);
2812 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2813 break;
2814 }
2815
2816 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2817
2818 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2819 " for recovery for CID: %hu on CID: %hu successful.\n",
2820 cmd->logout_cid, conn->cid);
2821 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2822 break;
2823 default:
2824 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2825 cmd->logout_reason);
2826 return -1;
2827 }
2828
e48354ce
NB		 2829 hdr->opcode = ISCSI_OP_LOGOUT_RSP;
2830 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2831 hdr->response = cmd->logout_response;
66c7db68 2832 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 2833 cmd->stat_sn = conn->stat_sn++;
2834 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2835
2836 iscsit_increment_maxcmdsn(cmd, conn->sess);
2837 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2838 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2839
2ec5a8c1
NB		 2840 pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2841 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2842 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2843 cmd->logout_cid, conn->cid);
2844
2845 return 0;
2846}
2847EXPORT_SYMBOL(iscsit_build_logout_rsp);
2848
2849static int
2850iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2851{
2852 struct kvec *iov;
2853 int niov = 0, tx_size, rc;
2854
2855 rc = iscsit_build_logout_rsp(cmd, conn,
2856 (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2857 if (rc < 0)
2858 return rc;
2859
2860 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2861 iov = &cmd->iov_misc[0];
2862 iov[niov].iov_base = cmd->pdu;
2863 iov[niov++].iov_len = ISCSI_HDR_LEN;
2864
2865 if (conn->conn_ops->HeaderDigest) {
2866 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2867
80690fdb
GU		 2868 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2869 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2870
2871 iov[0].iov_len += ISCSI_CRC_LEN;
2872 tx_size += ISCSI_CRC_LEN;
2873 pr_debug("Attaching CRC32C HeaderDigest to"
2874 " Logout Response 0x%08x\n", *header_digest);
2875 }
2876 cmd->iov_misc_count = niov;
2877 cmd->tx_size = tx_size;
2878
e48354ce
NB		 2879 return 0;
2880}
2881
2ec5a8c1
NB		 2882void
2883iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2884 struct iscsi_nopin *hdr, bool nopout_response)
2885{
2886 hdr->opcode = ISCSI_OP_NOOP_IN;
2887 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
2888 hton24(hdr->dlength, cmd->buf_ptr_size);
2889 if (nopout_response)
2890 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2891 hdr->itt = cmd->init_task_tag;
2892 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
2893 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ :
2894 conn->stat_sn;
2895 hdr->statsn = cpu_to_be32(cmd->stat_sn);
2896
2897 if (nopout_response)
2898 iscsit_increment_maxcmdsn(cmd, conn->sess);
2899
2900 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
2901 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
2902
2903 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2904 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2905 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2906 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2907}
2908EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2909
e48354ce
NB		 2910/*
2911 * Unsolicited NOPIN, either requesting a response or not.
2912 */
2913static int iscsit_send_unsolicited_nopin(
2914 struct iscsi_cmd *cmd,
2915 struct iscsi_conn *conn,
2916 int want_response)
2917{
2ec5a8c1
NB		 2918 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2919 int tx_size = ISCSI_HDR_LEN, ret;
e48354ce 2920
2ec5a8c1 2921 iscsit_build_nopin_rsp(cmd, conn, hdr, false);
e48354ce
NB		 2922
2923 if (conn->conn_ops->HeaderDigest) {
2924 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2925
80690fdb
GU		 2926 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2927 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2928
2929 tx_size += ISCSI_CRC_LEN;
2930 pr_debug("Attaching CRC32C HeaderDigest to"
2931 " NopIN 0x%08x\n", *header_digest);
2932 }
2933
2934 cmd->iov_misc[0].iov_base = cmd->pdu;
2935 cmd->iov_misc[0].iov_len = tx_size;
2936 cmd->iov_misc_count = 1;
2937 cmd->tx_size = tx_size;
2938
2939 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2940 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2941
6f3c0e69
AG		 2942 ret = iscsit_send_tx_data(cmd, conn, 1);
2943 if (ret < 0) {
2944 iscsit_tx_thread_wait_for_tcp(conn);
2945 return ret;
2946 }
2947
2948 spin_lock_bh(&cmd->istate_lock);
2949 cmd->i_state = want_response ?
2950 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2951 spin_unlock_bh(&cmd->istate_lock);
2952
e48354ce
NB		 2953 return 0;
2954}
2955
2ec5a8c1
NB		 2956static int
2957iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
e48354ce 2958{
2ec5a8c1 2959 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
e48354ce 2960 struct kvec *iov;
2ec5a8c1
NB		 2961 u32 padding = 0;
2962 int niov = 0, tx_size;
e48354ce 2963
2ec5a8c1 2964 iscsit_build_nopin_rsp(cmd, conn, hdr, true);
e48354ce 2965
2ec5a8c1 2966 tx_size = ISCSI_HDR_LEN;
e48354ce
NB		 2967 iov = &cmd->iov_misc[0];
2968 iov[niov].iov_base = cmd->pdu;
2969 iov[niov++].iov_len = ISCSI_HDR_LEN;
2970
2971 if (conn->conn_ops->HeaderDigest) {
2972 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2973
80690fdb
GU		 2974 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2975 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 2976
2977 iov[0].iov_len += ISCSI_CRC_LEN;
2978 tx_size += ISCSI_CRC_LEN;
2979 pr_debug("Attaching CRC32C HeaderDigest"
2980 " to NopIn 0x%08x\n", *header_digest);
2981 }
2982
2983 /*
2984 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2985 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2986 */
2987 if (cmd->buf_ptr_size) {
2988 iov[niov].iov_base = cmd->buf_ptr;
2989 iov[niov++].iov_len = cmd->buf_ptr_size;
2990 tx_size += cmd->buf_ptr_size;
2991
2992 pr_debug("Echoing back %u bytes of ping"
2993 " data.\n", cmd->buf_ptr_size);
2994
2995 padding = ((-cmd->buf_ptr_size) & 3);
2996 if (padding != 0) {
2997 iov[niov].iov_base = &cmd->pad_bytes;
2998 iov[niov++].iov_len = padding;
2999 tx_size += padding;
3000 pr_debug("Attaching %u additional"
3001 " padding bytes.\n", padding);
3002 }
3003 if (conn->conn_ops->DataDigest) {
3004 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3005 cmd->buf_ptr, cmd->buf_ptr_size,
3006 padding, (u8 *)&cmd->pad_bytes,
3007 (u8 *)&cmd->data_crc);
3008
3009 iov[niov].iov_base = &cmd->data_crc;
3010 iov[niov++].iov_len = ISCSI_CRC_LEN;
3011 tx_size += ISCSI_CRC_LEN;
3012 pr_debug("Attached DataDigest for %u"
3013 " bytes of ping data, CRC 0x%08x\n",
3014 cmd->buf_ptr_size, cmd->data_crc);
3015 }
3016 }
3017
3018 cmd->iov_misc_count = niov;
3019 cmd->tx_size = tx_size;
3020
e48354ce
NB		 3021 return 0;
3022}
3023
6f3c0e69 3024static int iscsit_send_r2t(
e48354ce
NB		 3025 struct iscsi_cmd *cmd,
3026 struct iscsi_conn *conn)
3027{
3028 int tx_size = 0;
3029 struct iscsi_r2t *r2t;
3030 struct iscsi_r2t_rsp *hdr;
6f3c0e69 3031 int ret;
e48354ce
NB		 3032
3033 r2t = iscsit_get_r2t_from_list(cmd);
3034 if (!r2t)
3035 return -1;
3036
3037 hdr = (struct iscsi_r2t_rsp *) cmd->pdu;
3038 memset(hdr, 0, ISCSI_HDR_LEN);
3039 hdr->opcode = ISCSI_OP_R2T;
3040 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3041 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3042 (struct scsi_lun *)&hdr->lun);
66c7db68 3043 hdr->itt = cmd->init_task_tag;
c1e34b64 3044 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
e48354ce
NB		 3045 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag);
3046 hdr->statsn = cpu_to_be32(conn->stat_sn);
3047 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3048 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3049 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn);
3050 hdr->data_offset = cpu_to_be32(r2t->offset);
3051 hdr->data_length = cpu_to_be32(r2t->xfer_len);
3052
3053 cmd->iov_misc[0].iov_base = cmd->pdu;
3054 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3055 tx_size += ISCSI_HDR_LEN;
3056
3057 if (conn->conn_ops->HeaderDigest) {
3058 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3059
80690fdb
GU		 3060 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3061 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3062
3063 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3064 tx_size += ISCSI_CRC_LEN;
3065 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3066 " PDU 0x%08x\n", *header_digest);
3067 }
3068
3069 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3070 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3071 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3072 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3073 r2t->offset, r2t->xfer_len, conn->cid);
3074
3075 cmd->iov_misc_count = 1;
3076 cmd->tx_size = tx_size;
3077
3078 spin_lock_bh(&cmd->r2t_lock);
3079 r2t->sent_r2t = 1;
3080 spin_unlock_bh(&cmd->r2t_lock);
3081
6f3c0e69
AG		 3082 ret = iscsit_send_tx_data(cmd, conn, 1);
3083 if (ret < 0) {
3084 iscsit_tx_thread_wait_for_tcp(conn);
3085 return ret;
3086 }
3087
3088 spin_lock_bh(&cmd->dataout_timeout_lock);
3089 iscsit_start_dataout_timer(cmd, conn);
3090 spin_unlock_bh(&cmd->dataout_timeout_lock);
3091
e48354ce
NB		 3092 return 0;
3093}
3094
3095/*
8b1e1244
AG		 3096 * @recovery: If called from iscsi_task_reassign_complete_write() for
3097 * connection recovery.
e48354ce
NB		 3098 */
3099int iscsit_build_r2ts_for_cmd(
e48354ce 3100 struct iscsi_conn *conn,
3e1c81a9 3101 struct iscsi_cmd *cmd,
8b1e1244 3102 bool recovery)
e48354ce
NB		 3103{
3104 int first_r2t = 1;
3105 u32 offset = 0, xfer_len = 0;
3106
3107 spin_lock_bh(&cmd->r2t_lock);
3108 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3109 spin_unlock_bh(&cmd->r2t_lock);
3110 return 0;
3111 }
3112
8b1e1244
AG		 3113 if (conn->sess->sess_ops->DataSequenceInOrder &&
3114 !recovery)
c6037cc5 3115 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
e48354ce
NB		 3116
3117 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3118 if (conn->sess->sess_ops->DataSequenceInOrder) {
3119 offset = cmd->r2t_offset;
3120
8b1e1244
AG		 3121 if (first_r2t && recovery) {
3122 int new_data_end = offset +
3123 conn->sess->sess_ops->MaxBurstLength -
3124 cmd->next_burst_len;
3125
ebf1d95c
AG		 3126 if (new_data_end > cmd->se_cmd.data_length)
3127 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3128 else
3129 xfer_len =
3130 conn->sess->sess_ops->MaxBurstLength -
3131 cmd->next_burst_len;
e48354ce 3132 } else {
8b1e1244
AG		 3133 int new_data_end = offset +
3134 conn->sess->sess_ops->MaxBurstLength;
3135
ebf1d95c
AG		 3136 if (new_data_end > cmd->se_cmd.data_length)
3137 xfer_len = cmd->se_cmd.data_length - offset;
8b1e1244
AG		 3138 else
3139 xfer_len = conn->sess->sess_ops->MaxBurstLength;
e48354ce
NB		 3140 }
3141 cmd->r2t_offset += xfer_len;
3142
ebf1d95c 3143 if (cmd->r2t_offset == cmd->se_cmd.data_length)
e48354ce
NB		 3144 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3145 } else {
3146 struct iscsi_seq *seq;
3147
3148 seq = iscsit_get_seq_holder_for_r2t(cmd);
3149 if (!seq) {
3150 spin_unlock_bh(&cmd->r2t_lock);
3151 return -1;
3152 }
3153
3154 offset = seq->offset;
3155 xfer_len = seq->xfer_len;
3156
3157 if (cmd->seq_send_order == cmd->seq_count)
3158 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3159 }
3160 cmd->outstanding_r2ts++;
3161 first_r2t = 0;
3162
3163 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3164 spin_unlock_bh(&cmd->r2t_lock);
3165 return -1;
3166 }
3167
3168 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3169 break;
3170 }
3171 spin_unlock_bh(&cmd->r2t_lock);
3172
3173 return 0;
3174}
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);
3201 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
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];
3213 struct kvec *iov;
3214 u32 padding = 0, tx_size = 0;
3215 int iov_count = 0;
3216 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3217
3218 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3219
e48354ce
NB		 3220 iov = &cmd->iov_misc[0];
3221 iov[iov_count].iov_base = cmd->pdu;
3222 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3223 tx_size += ISCSI_HDR_LEN;
3224
3225 /*
3226 * Attach SENSE DATA payload to iSCSI Response PDU
3227 */
3228 if (cmd->se_cmd.sense_buffer &&
3229 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3230 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
9c58b7dd
RD		 3231 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3232 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3233
e48354ce 3234 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
50e5c87d 3235 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
9c58b7dd 3236 iov[iov_count].iov_base = cmd->sense_buffer;
e48354ce
NB		 3237 iov[iov_count++].iov_len =
3238 (cmd->se_cmd.scsi_sense_length + padding);
3239 tx_size += cmd->se_cmd.scsi_sense_length;
3240
3241 if (padding) {
9c58b7dd 3242 memset(cmd->sense_buffer +
e48354ce
NB		 3243 cmd->se_cmd.scsi_sense_length, 0, padding);
3244 tx_size += padding;
3245 pr_debug("Adding %u bytes of padding to"
3246 " SENSE.\n", padding);
3247 }
3248
3249 if (conn->conn_ops->DataDigest) {
3250 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
9c58b7dd 3251 cmd->sense_buffer,
e48354ce
NB		 3252 (cmd->se_cmd.scsi_sense_length + padding),
3253 0, NULL, (u8 *)&cmd->data_crc);
3254
3255 iov[iov_count].iov_base = &cmd->data_crc;
3256 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3257 tx_size += ISCSI_CRC_LEN;
3258
3259 pr_debug("Attaching CRC32 DataDigest for"
3260 " SENSE, %u bytes CRC 0x%08x\n",
3261 (cmd->se_cmd.scsi_sense_length + padding),
3262 cmd->data_crc);
3263 }
3264
3265 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3266 " Response PDU\n",
3267 cmd->se_cmd.scsi_sense_length);
3268 }
3269
3270 if (conn->conn_ops->HeaderDigest) {
3271 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3272
80690fdb
GU		 3273 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3274 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3275
3276 iov[0].iov_len += ISCSI_CRC_LEN;
3277 tx_size += ISCSI_CRC_LEN;
3278 pr_debug("Attaching CRC32 HeaderDigest for Response"
3279 " PDU 0x%08x\n", *header_digest);
3280 }
3281
3282 cmd->iov_misc_count = iov_count;
3283 cmd->tx_size = tx_size;
3284
e48354ce
NB		 3285 return 0;
3286}
3287
3288static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3289{
3290 switch (se_tmr->response) {
3291 case TMR_FUNCTION_COMPLETE:
3292 return ISCSI_TMF_RSP_COMPLETE;
3293 case TMR_TASK_DOES_NOT_EXIST:
3294 return ISCSI_TMF_RSP_NO_TASK;
3295 case TMR_LUN_DOES_NOT_EXIST:
3296 return ISCSI_TMF_RSP_NO_LUN;
3297 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3298 return ISCSI_TMF_RSP_NOT_SUPPORTED;
e48354ce
NB		 3299 case TMR_FUNCTION_REJECTED:
3300 default:
3301 return ISCSI_TMF_RSP_REJECTED;
3302 }
3303}
3304
2ec5a8c1
NB		 3305void
3306iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3307 struct iscsi_tm_rsp *hdr)
e48354ce
NB		 3308{
3309 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
e48354ce 3310
e48354ce 3311 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP;
7ae0b103 3312 hdr->flags = ISCSI_FLAG_CMD_FINAL;
e48354ce 3313 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr);
66c7db68 3314 hdr->itt = cmd->init_task_tag;
e48354ce
NB		 3315 cmd->stat_sn = conn->stat_sn++;
3316 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3317
3318 iscsit_increment_maxcmdsn(cmd, conn->sess);
3319 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3320 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3321
2ec5a8c1
NB		 3322 pr_debug("Built Task Management Response ITT: 0x%08x,"
3323 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3324 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3325}
3326EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3327
3328static int
3329iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3330{
3331 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3332 u32 tx_size = 0;
3333
3334 iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3335
e48354ce
NB		 3336 cmd->iov_misc[0].iov_base = cmd->pdu;
3337 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN;
3338 tx_size += ISCSI_HDR_LEN;
3339
3340 if (conn->conn_ops->HeaderDigest) {
3341 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3342
80690fdb
GU		 3343 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3344 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3345
3346 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3347 tx_size += ISCSI_CRC_LEN;
3348 pr_debug("Attaching CRC32 HeaderDigest for Task"
3349 " Mgmt Response PDU 0x%08x\n", *header_digest);
3350 }
3351
3352 cmd->iov_misc_count = 1;
3353 cmd->tx_size = tx_size;
3354
e48354ce
NB		 3355 return 0;
3356}
3357
2f9bc894
NB		 3358static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3359{
3360 bool ret = false;
3361
3362 if (np->np_sockaddr.ss_family == AF_INET6) {
3363 const struct sockaddr_in6 sin6 = {
3364 .sin6_addr = IN6ADDR_ANY_INIT };
3365 struct sockaddr_in6 *sock_in6 =
3366 (struct sockaddr_in6 *)&np->np_sockaddr;
3367
3368 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3369 sin6.sin6_addr.s6_addr, 16))
3370 ret = true;
3371 } else {
3372 struct sockaddr_in * sock_in =
3373 (struct sockaddr_in *)&np->np_sockaddr;
3374
cea0b4ce 3375 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
2f9bc894
NB		 3376 ret = true;
3377 }
3378
3379 return ret;
3380}
3381
8b1e1244
AG		 3382#define SENDTARGETS_BUF_LIMIT 32768U
3383
22c7aaa5
SG		 3384static int
3385iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
e4f4e801
SG		 3386 enum iscsit_transport_type network_transport,
3387 int skip_bytes, bool *completed)
e48354ce
NB		 3388{
3389 char *payload = NULL;
3390 struct iscsi_conn *conn = cmd->conn;
3391 struct iscsi_portal_group *tpg;
3392 struct iscsi_tiqn *tiqn;
3393 struct iscsi_tpg_np *tpg_np;
3394 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
2dd1d53f 3395 int target_name_printed;
8b1e1244 3396 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
6665889c 3397 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
e48354ce 3398
be7dcfb6 3399 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
8b1e1244 3400 SENDTARGETS_BUF_LIMIT);
e48354ce
NB		 3401
3402 payload = kzalloc(buffer_len, GFP_KERNEL);
3403 if (!payload) {
3404 pr_err("Unable to allocate memory for sendtargets"
3405 " response.\n");
3406 return -ENOMEM;
3407 }
6665889c 3408 /*
8060b8dd 3409 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
6665889c
NB		 3410 * explicit case..
3411 */
8060b8dd 3412 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
6665889c
NB		 3413 text_ptr = strchr(text_in, '=');
3414 if (!text_ptr) {
3415 pr_err("Unable to locate '=' string in text_in:"
3416 " %s\n", text_in);
4f45d320 3417 kfree(payload);
6665889c
NB		 3418 return -EINVAL;
3419 }
3420 /*
3421 * Skip over '=' character..
3422 */
3423 text_ptr += 1;
3424 }
e48354ce
NB		 3425
3426 spin_lock(&tiqn_lock);
3427 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
8060b8dd 3428 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
6665889c
NB		 3429 strcmp(tiqn->tiqn, text_ptr)) {
3430 continue;
3431 }
3432
2dd1d53f 3433 target_name_printed = 0;
e48354ce
NB		 3434
3435 spin_lock(&tiqn->tiqn_tpg_lock);
3436 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3437
2dd1d53f
TG		 3438 /* If demo_mode_discovery=0 and generate_node_acls=0
3439 * (demo mode dislabed) do not return
3440 * TargetName+TargetAddress unless a NodeACL exists.
3441 */
3442
3443 if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3444 (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3445 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3446 cmd->conn->sess->sess_ops->InitiatorName))) {
3447 continue;
3448 }
3449
e48354ce
NB		 3450 spin_lock(&tpg->tpg_state_lock);
3451 if ((tpg->tpg_state == TPG_STATE_FREE) ||
3452 (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3453 spin_unlock(&tpg->tpg_state_lock);
3454 continue;
3455 }
3456 spin_unlock(&tpg->tpg_state_lock);
3457
3458 spin_lock(&tpg->tpg_np_lock);
3459 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3460 tpg_np_list) {
2f9bc894
NB		 3461 struct iscsi_np *np = tpg_np->tpg_np;
3462 bool inaddr_any = iscsit_check_inaddr_any(np);
3463
22c7aaa5
SG		 3464 if (np->np_network_transport != network_transport)
3465 continue;
3466
2dd1d53f
TG		 3467 if (!target_name_printed) {
3468 len = sprintf(buf, "TargetName=%s",
3469 tiqn->tiqn);
3470 len += 1;
3471
3472 if ((len + payload_len) > buffer_len) {
3473 spin_unlock(&tpg->tpg_np_lock);
3474 spin_unlock(&tiqn->tiqn_tpg_lock);
3475 end_of_buf = 1;
3476 goto eob;
3477 }
e4f4e801
SG		 3478
3479 if (skip_bytes && len <= skip_bytes) {
3480 skip_bytes -= len;
3481 } else {
3482 memcpy(payload + payload_len, buf, len);
3483 payload_len += len;
3484 target_name_printed = 1;
3485 if (len > skip_bytes)
3486 skip_bytes = 0;
3487 }
2dd1d53f
TG		 3488 }
3489
e48354ce 3490 len = sprintf(buf, "TargetAddress="
dfecf611 3491 "%s:%hu,%hu",
0bcc297e 3492 inaddr_any ? conn->local_ip : np->np_ip,
f2774f43 3493 np->np_port,
e48354ce
NB		 3494 tpg->tpgt);
3495 len += 1;
3496
3497 if ((len + payload_len) > buffer_len) {
3498 spin_unlock(&tpg->tpg_np_lock);
3499 spin_unlock(&tiqn->tiqn_tpg_lock);
3500 end_of_buf = 1;
3501 goto eob;
3502 }
e4f4e801
SG		 3503
3504 if (skip_bytes && len <= skip_bytes) {
3505 skip_bytes -= len;
3506 } else {
3507 memcpy(payload + payload_len, buf, len);
3508 payload_len += len;
3509 if (len > skip_bytes)
3510 skip_bytes = 0;
3511 }
e48354ce
NB		 3512 }
3513 spin_unlock(&tpg->tpg_np_lock);
3514 }
3515 spin_unlock(&tiqn->tiqn_tpg_lock);
3516eob:
e4f4e801
SG		 3517 if (end_of_buf) {
3518 *completed = false;
e48354ce 3519 break;
e4f4e801 3520 }
6665889c 3521
8060b8dd 3522 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
6665889c 3523 break;
e48354ce
NB		 3524 }
3525 spin_unlock(&tiqn_lock);
3526
3527 cmd->buf_ptr = payload;
3528
3529 return payload_len;
3530}
3531
889c8a68
NB		 3532int
3533iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
22c7aaa5
SG		 3534 struct iscsi_text_rsp *hdr,
3535 enum iscsit_transport_type network_transport)
e48354ce 3536{
889c8a68 3537 int text_length, padding;
e4f4e801 3538 bool completed = true;
e48354ce 3539
e4f4e801
SG		 3540 text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3541 cmd->read_data_done,
3542 &completed);
e48354ce
NB		 3543 if (text_length < 0)
3544 return text_length;
3545
e4f4e801
SG		 3546 if (completed) {
3547 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3548 } else {
3549 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3550 cmd->read_data_done += text_length;
3551 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3552 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3553 }
889c8a68 3554 hdr->opcode = ISCSI_OP_TEXT_RSP;
e48354ce 3555 padding = ((-text_length) & 3);
e48354ce 3556 hton24(hdr->dlength, text_length);
889c8a68
NB		 3557 hdr->itt = cmd->init_task_tag;
3558 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3559 cmd->stat_sn = conn->stat_sn++;
3560 hdr->statsn = cpu_to_be32(cmd->stat_sn);
e48354ce
NB		 3561
3562 iscsit_increment_maxcmdsn(cmd, conn->sess);
e4f4e801
SG		 3563 /*
3564 * Reset maxcmdsn_inc in multi-part text payload exchanges to
3565 * correctly increment MaxCmdSN for each response answering a
3566 * non immediate text request with a valid CmdSN.
3567 */
3568 cmd->maxcmdsn_inc = 0;
889c8a68
NB		 3569 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3570 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
e48354ce 3571
e4f4e801
SG		 3572 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3573 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3574 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3575 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3576 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
889c8a68
NB		 3577
3578 return text_length + padding;
3579}
3580EXPORT_SYMBOL(iscsit_build_text_rsp);
e48354ce 3581
889c8a68
NB		 3582static int iscsit_send_text_rsp(
3583 struct iscsi_cmd *cmd,
3584 struct iscsi_conn *conn)
3585{
3586 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3587 struct kvec *iov;
3588 u32 tx_size = 0;
3589 int text_length, iov_count = 0, rc;
3590
22c7aaa5 3591 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
889c8a68
NB		 3592 if (rc < 0)
3593 return rc;
3594
3595 text_length = rc;
3596 iov = &cmd->iov_misc[0];
e48354ce
NB		 3597 iov[iov_count].iov_base = cmd->pdu;
3598 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3599 iov[iov_count].iov_base = cmd->buf_ptr;
889c8a68 3600 iov[iov_count++].iov_len = text_length;
e48354ce 3601
889c8a68 3602 tx_size += (ISCSI_HDR_LEN + text_length);
e48354ce
NB		 3603
3604 if (conn->conn_ops->HeaderDigest) {
3605 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3606
80690fdb
GU		 3607 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3608 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3609
3610 iov[0].iov_len += ISCSI_CRC_LEN;
3611 tx_size += ISCSI_CRC_LEN;
3612 pr_debug("Attaching CRC32 HeaderDigest for"
3613 " Text Response PDU 0x%08x\n", *header_digest);
3614 }
3615
3616 if (conn->conn_ops->DataDigest) {
3617 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
889c8a68 3618 cmd->buf_ptr, text_length,
e48354ce
NB		 3619 0, NULL, (u8 *)&cmd->data_crc);
3620
3621 iov[iov_count].iov_base = &cmd->data_crc;
3622 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3623 tx_size += ISCSI_CRC_LEN;
3624
3625 pr_debug("Attaching DataDigest for %u bytes of text"
889c8a68 3626 " data, CRC 0x%08x\n", text_length,
e48354ce
NB		 3627 cmd->data_crc);
3628 }
3629
3630 cmd->iov_misc_count = iov_count;
3631 cmd->tx_size = tx_size;
3632
e48354ce
NB		 3633 return 0;
3634}
3635
2ec5a8c1
NB		 3636void
3637iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3638 struct iscsi_reject *hdr)
3639{
3640 hdr->opcode = ISCSI_OP_REJECT;
ba159914 3641 hdr->reason = cmd->reject_reason;
2ec5a8c1
NB		 3642 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3643 hton24(hdr->dlength, ISCSI_HDR_LEN);
3644 hdr->ffffffff = cpu_to_be32(0xffffffff);
3645 cmd->stat_sn = conn->stat_sn++;
3646 hdr->statsn = cpu_to_be32(cmd->stat_sn);
3647 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3648 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3649
3650}
3651EXPORT_SYMBOL(iscsit_build_reject);
3652
e48354ce
NB		 3653static int iscsit_send_reject(
3654 struct iscsi_cmd *cmd,
3655 struct iscsi_conn *conn)
3656{
bfbdb31d 3657 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
e48354ce 3658 struct kvec *iov;
bfbdb31d 3659 u32 iov_count = 0, tx_size;
e48354ce 3660
bfbdb31d 3661 iscsit_build_reject(cmd, conn, hdr);
e48354ce
NB		 3662
3663 iov = &cmd->iov_misc[0];
e48354ce
NB		 3664 iov[iov_count].iov_base = cmd->pdu;
3665 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3666 iov[iov_count].iov_base = cmd->buf_ptr;
3667 iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3668
3669 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3670
3671 if (conn->conn_ops->HeaderDigest) {
3672 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3673
80690fdb
GU		 3674 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3675 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
e48354ce
NB		 3676
3677 iov[0].iov_len += ISCSI_CRC_LEN;
3678 tx_size += ISCSI_CRC_LEN;
3679 pr_debug("Attaching CRC32 HeaderDigest for"
3680 " REJECT PDU 0x%08x\n", *header_digest);
3681 }
3682
3683 if (conn->conn_ops->DataDigest) {
80690fdb
GU		 3684 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3685 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
e48354ce
NB		 3686
3687 iov[iov_count].iov_base = &cmd->data_crc;
3688 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3689 tx_size += ISCSI_CRC_LEN;
3690 pr_debug("Attaching CRC32 DataDigest for REJECT"
3691 " PDU 0x%08x\n", cmd->data_crc);
3692 }
3693
3694 cmd->iov_misc_count = iov_count;
3695 cmd->tx_size = tx_size;
3696
3697 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3698 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3699
3700 return 0;
3701}
3702
e48354ce
NB		 3703void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3704{
e48354ce
NB		 3705 int ord, cpu;
3706 /*
88dcd2da
NB		 3707 * bitmap_id is assigned from iscsit_global->ts_bitmap from
3708 * within iscsit_start_kthreads()
e48354ce 3709 *
88dcd2da
NB		 3710 * Here we use bitmap_id to determine which CPU that this
3711 * iSCSI connection's RX/TX threads will be scheduled to
e48354ce
NB		 3712 * execute upon.
3713 */
88dcd2da 3714 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
e48354ce
NB		 3715 for_each_online_cpu(cpu) {
3716 if (ord-- == 0) {
3717 cpumask_set_cpu(cpu, conn->conn_cpumask);
3718 return;
3719 }
3720 }
3721 /*
3722 * This should never be reached..
3723 */
3724 dump_stack();
3725 cpumask_setall(conn->conn_cpumask);
3726}
3727
3728static inline void iscsit_thread_check_cpumask(
3729 struct iscsi_conn *conn,
3730 struct task_struct *p,
3731 int mode)
3732{
e48354ce
NB		 3733 /*
3734 * mode == 1 signals iscsi_target_tx_thread() usage.
3735 * mode == 0 signals iscsi_target_rx_thread() usage.
3736 */
3737 if (mode == 1) {
3738 if (!conn->conn_tx_reset_cpumask)
3739 return;
3740 conn->conn_tx_reset_cpumask = 0;
3741 } else {
3742 if (!conn->conn_rx_reset_cpumask)
3743 return;
3744 conn->conn_rx_reset_cpumask = 0;
3745 }
3746 /*
3747 * Update the CPU mask for this single kthread so that
3748 * both TX and RX kthreads are scheduled to run on the
3749 * same CPU.
3750 */
e48354ce
NB		 3751 set_cpus_allowed_ptr(p, conn->conn_cpumask);
3752}
3753
2ec5a8c1
NB		 3754static int
3755iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
e48354ce 3756{
6f3c0e69
AG		 3757 int ret;
3758
2ec5a8c1
NB		 3759 switch (state) {
3760 case ISTATE_SEND_R2T:
3761 ret = iscsit_send_r2t(cmd, conn);
3762 if (ret < 0)
3763 goto err;
3764 break;
3765 case ISTATE_REMOVE:
3766 spin_lock_bh(&conn->cmd_lock);
5159d763 3767 list_del_init(&cmd->i_conn_node);
2ec5a8c1 3768 spin_unlock_bh(&conn->cmd_lock);
6f3c0e69 3769
aafc9d15 3770 iscsit_free_cmd(cmd, false);
2ec5a8c1
NB		 3771 break;
3772 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3773 iscsit_mod_nopin_response_timer(conn);
3774 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3775 if (ret < 0)
6f3c0e69 3776 goto err;
2ec5a8c1
NB		 3777 break;
3778 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3779 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3780 if (ret < 0)
3781 goto err;
3782 break;
3783 default:
3784 pr_err("Unknown Opcode: 0x%02x ITT:"
3785 " 0x%08x, i_state: %d on CID: %hu\n",
3786 cmd->iscsi_opcode, cmd->init_task_tag, state,
3787 conn->cid);
3788 goto err;
6f3c0e69
AG		 3789 }
3790
3791 return 0;
3792
3793err:
3794 return -1;
3795}
3796
2ec5a8c1
NB		 3797static int
3798iscsit_handle_immediate_queue(struct iscsi_conn *conn)
6f3c0e69 3799{
2ec5a8c1 3800 struct iscsit_transport *t = conn->conn_transport;
6f3c0e69
AG		 3801 struct iscsi_queue_req *qr;
3802 struct iscsi_cmd *cmd;
3803 u8 state;
3804 int ret;
3805
2ec5a8c1
NB		 3806 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3807 atomic_set(&conn->check_immediate_queue, 0);
6f3c0e69
AG		 3808 cmd = qr->cmd;
3809 state = qr->state;
3810 kmem_cache_free(lio_qr_cache, qr);
3811
2ec5a8c1
NB		 3812 ret = t->iscsit_immediate_queue(conn, cmd, state);
3813 if (ret < 0)
3814 return ret;
3815 }
fd3a9025 3816
2ec5a8c1
NB		 3817 return 0;
3818}
6f3c0e69 3819
2ec5a8c1
NB		 3820static int
3821iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3822{
3823 int ret;
3824
3825check_rsp_state:
3826 switch (state) {
3827 case ISTATE_SEND_DATAIN:
3828 ret = iscsit_send_datain(cmd, conn);
6f3c0e69
AG		 3829 if (ret < 0)
3830 goto err;
2ec5a8c1
NB		 3831 else if (!ret)
3832 /* more drs */
3833 goto check_rsp_state;
3834 else if (ret == 1) {
3835 /* all done */
3836 spin_lock_bh(&cmd->istate_lock);
3837 cmd->i_state = ISTATE_SENT_STATUS;
3838 spin_unlock_bh(&cmd->istate_lock);
6f3c0e69 3839
2ec5a8c1
NB		 3840 if (atomic_read(&conn->check_immediate_queue))
3841 return 1;
6f3c0e69 3842
2ec5a8c1
NB		 3843 return 0;
3844 } else if (ret == 2) {
3845 /* Still must send status,
3846 SCF_TRANSPORT_TASK_SENSE was set */
6f3c0e69 3847 spin_lock_bh(&cmd->istate_lock);
2ec5a8c1 3848 cmd->i_state = ISTATE_SEND_STATUS;
6f3c0e69 3849 spin_unlock_bh(&cmd->istate_lock);
2ec5a8c1
NB		 3850 state = ISTATE_SEND_STATUS;
3851 goto check_rsp_state;
3852 }
3853
3854 break;
3855 case ISTATE_SEND_STATUS:
3856 case ISTATE_SEND_STATUS_RECOVERY:
3857 ret = iscsit_send_response(cmd, conn);
3858 break;
3859 case ISTATE_SEND_LOGOUTRSP:
3860 ret = iscsit_send_logout(cmd, conn);
3861 break;
3862 case ISTATE_SEND_ASYNCMSG:
3863 ret = iscsit_send_conn_drop_async_message(
3864 cmd, conn);
3865 break;
3866 case ISTATE_SEND_NOPIN:
3867 ret = iscsit_send_nopin(cmd, conn);
3868 break;
3869 case ISTATE_SEND_REJECT:
3870 ret = iscsit_send_reject(cmd, conn);
3871 break;
3872 case ISTATE_SEND_TASKMGTRSP:
3873 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3874 if (ret != 0)
6f3c0e69 3875 break;
2ec5a8c1
NB		 3876 ret = iscsit_tmr_post_handler(cmd, conn);
3877 if (ret != 0)
3878 iscsit_fall_back_to_erl0(conn->sess);
3879 break;
3880 case ISTATE_SEND_TEXTRSP:
3881 ret = iscsit_send_text_rsp(cmd, conn);
3882 break;
3883 default:
3884 pr_err("Unknown Opcode: 0x%02x ITT:"
3885 " 0x%08x, i_state: %d on CID: %hu\n",
3886 cmd->iscsi_opcode, cmd->init_task_tag,
3887 state, conn->cid);
3888 goto err;
3889 }
3890 if (ret < 0)
3891 goto err;
3892
3893 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3894 iscsit_tx_thread_wait_for_tcp(conn);
3895 iscsit_unmap_iovec(cmd);
3896 goto err;
3897 }
3898 iscsit_unmap_iovec(cmd);
3899
3900 switch (state) {
3901 case ISTATE_SEND_LOGOUTRSP:
3902 if (!iscsit_logout_post_handler(cmd, conn))
88dcd2da 3903 return -ECONNRESET;
2ec5a8c1
NB		 3904 /* fall through */
3905 case ISTATE_SEND_STATUS:
3906 case ISTATE_SEND_ASYNCMSG:
3907 case ISTATE_SEND_NOPIN:
3908 case ISTATE_SEND_STATUS_RECOVERY:
3909 case ISTATE_SEND_TEXTRSP:
3910 case ISTATE_SEND_TASKMGTRSP:
ba159914 3911 case ISTATE_SEND_REJECT:
2ec5a8c1
NB		 3912 spin_lock_bh(&cmd->istate_lock);
3913 cmd->i_state = ISTATE_SENT_STATUS;
3914 spin_unlock_bh(&cmd->istate_lock);
3915 break;
2ec5a8c1
NB		 3916 default:
3917 pr_err("Unknown Opcode: 0x%02x ITT:"
3918 " 0x%08x, i_state: %d on CID: %hu\n",
3919 cmd->iscsi_opcode, cmd->init_task_tag,
3920 cmd->i_state, conn->cid);
3921 goto err;
6f3c0e69
AG		 3922 }
3923
2ec5a8c1
NB		 3924 if (atomic_read(&conn->check_immediate_queue))
3925 return 1;
3926
6f3c0e69
AG		 3927 return 0;
3928
3929err:
3930 return -1;
6f3c0e69
AG		 3931}
3932
2ec5a8c1
NB		 3933static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3934{
3935 struct iscsit_transport *t = conn->conn_transport;
3936 struct iscsi_queue_req *qr;
3937 struct iscsi_cmd *cmd;
3938 u8 state;
3939 int ret;
3940
3941 while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3942 cmd = qr->cmd;
3943 state = qr->state;
3944 kmem_cache_free(lio_qr_cache, qr);
3945
3946 ret = t->iscsit_response_queue(conn, cmd, state);
3947 if (ret == 1 || ret < 0)
3948 return ret;
3949 }
3950
3951 return 0;
3952}
3953
6f3c0e69
AG		 3954int iscsi_target_tx_thread(void *arg)
3955{
e48354ce 3956 int ret = 0;
88dcd2da 3957 struct iscsi_conn *conn = arg;
e48354ce
NB		 3958 /*
3959 * Allow ourselves to be interrupted by SIGINT so that a
3960 * connection recovery / failure event can be triggered externally.
3961 */
3962 allow_signal(SIGINT);
3963
e48354ce
NB		 3964 while (!kthread_should_stop()) {
3965 /*
3966 * Ensure that both TX and RX per connection kthreads
3967 * are scheduled to run on the same CPU.
3968 */
3969 iscsit_thread_check_cpumask(conn, current, 1);
3970
d5627acb 3971 wait_event_interruptible(conn->queues_wq,
88dcd2da 3972 !iscsit_conn_all_queues_empty(conn));
e48354ce 3973
88dcd2da 3974 if (signal_pending(current))
e48354ce
NB		 3975 goto transport_err;
3976
fd3a9025 3977get_immediate:
2ec5a8c1 3978 ret = iscsit_handle_immediate_queue(conn);
6f3c0e69
AG		 3979 if (ret < 0)
3980 goto transport_err;
e48354ce 3981
2ec5a8c1 3982 ret = iscsit_handle_response_queue(conn);
fd3a9025
NB		 3983 if (ret == 1)
3984 goto get_immediate;
88dcd2da
NB		 3985 else if (ret == -ECONNRESET)
3986 goto out;
6f3c0e69
AG		 3987 else if (ret < 0)
3988 goto transport_err;
e48354ce
NB		 3989 }
3990
3991transport_err:
3992 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 3993out:
3994 return 0;
3995}
3996
3e1c81a9
NB		 3997static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3998{
3999 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4000 struct iscsi_cmd *cmd;
4001 int ret = 0;
4002
4003 switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4004 case ISCSI_OP_SCSI_CMD:
676687c6 4005 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4006 if (!cmd)
ba159914 4007 goto reject;
3e1c81a9
NB		 4008
4009 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4010 break;
4011 case ISCSI_OP_SCSI_DATA_OUT:
4012 ret = iscsit_handle_data_out(conn, buf);
4013 break;
4014 case ISCSI_OP_NOOP_OUT:
4015 cmd = NULL;
4016 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
676687c6 4017 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4018 if (!cmd)
ba159914 4019 goto reject;
3e1c81a9
NB		 4020 }
4021 ret = iscsit_handle_nop_out(conn, cmd, buf);
4022 break;
4023 case ISCSI_OP_SCSI_TMFUNC:
676687c6 4024 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4025 if (!cmd)
ba159914 4026 goto reject;
3e1c81a9
NB		 4027
4028 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4029 break;
4030 case ISCSI_OP_TEXT:
e4f4e801
SG		 4031 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4032 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4033 if (!cmd)
4034 goto reject;
4035 } else {
4036 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4037 if (!cmd)
4038 goto reject;
4039 }
64534aa7
NB		 4040
4041 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3e1c81a9
NB		 4042 break;
4043 case ISCSI_OP_LOGOUT:
676687c6 4044 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3e1c81a9 4045 if (!cmd)
ba159914 4046 goto reject;
3e1c81a9
NB		 4047
4048 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4049 if (ret > 0)
4050 wait_for_completion_timeout(&conn->conn_logout_comp,
4051 SECONDS_FOR_LOGOUT_COMP * HZ);
4052 break;
4053 case ISCSI_OP_SNACK:
4054 ret = iscsit_handle_snack(conn, buf);
4055 break;
4056 default:
4057 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4058 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4059 pr_err("Cannot recover from unknown"
4060 " opcode while ERL=0, closing iSCSI connection.\n");
4061 return -1;
4062 }
4063 if (!conn->conn_ops->OFMarker) {
4064 pr_err("Unable to recover from unknown"
4065 " opcode while OFMarker=No, closing iSCSI"
4066 " connection.\n");
4067 return -1;
4068 }
4069 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4070 pr_err("Unable to recover from unknown"
4071 " opcode, closing iSCSI connection.\n");
4072 return -1;
4073 }
4074 break;
4075 }
4076
4077 return ret;
ba159914
NB		 4078reject:
4079 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3e1c81a9
NB		 4080}
4081
e48354ce
NB		 4082int iscsi_target_rx_thread(void *arg)
4083{
4084 int ret;
4085 u8 buffer[ISCSI_HDR_LEN], opcode;
4086 u32 checksum = 0, digest = 0;
88dcd2da 4087 struct iscsi_conn *conn = arg;
e48354ce
NB		 4088 struct kvec iov;
4089 /*
4090 * Allow ourselves to be interrupted by SIGINT so that a
4091 * connection recovery / failure event can be triggered externally.
4092 */
4093 allow_signal(SIGINT);
4094
3e1c81a9
NB		 4095 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4096 struct completion comp;
4097 int rc;
4098
4099 init_completion(&comp);
4100 rc = wait_for_completion_interruptible(&comp);
4101 if (rc < 0)
4102 goto transport_err;
4103
88dcd2da 4104 goto transport_err;
3e1c81a9
NB		 4105 }
4106
e48354ce
NB		 4107 while (!kthread_should_stop()) {
4108 /*
4109 * Ensure that both TX and RX per connection kthreads
4110 * are scheduled to run on the same CPU.
4111 */
4112 iscsit_thread_check_cpumask(conn, current, 0);
4113
4114 memset(buffer, 0, ISCSI_HDR_LEN);
4115 memset(&iov, 0, sizeof(struct kvec));
4116
4117 iov.iov_base = buffer;
4118 iov.iov_len = ISCSI_HDR_LEN;
4119
4120 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4121 if (ret != ISCSI_HDR_LEN) {
4122 iscsit_rx_thread_wait_for_tcp(conn);
4123 goto transport_err;
4124 }
4125
e48354ce
NB		 4126 if (conn->conn_ops->HeaderDigest) {
4127 iov.iov_base = &digest;
4128 iov.iov_len = ISCSI_CRC_LEN;
4129
4130 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4131 if (ret != ISCSI_CRC_LEN) {
4132 iscsit_rx_thread_wait_for_tcp(conn);
4133 goto transport_err;
4134 }
4135
4136 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4137 buffer, ISCSI_HDR_LEN,
4138 0, NULL, (u8 *)&checksum);
4139
4140 if (digest != checksum) {
4141 pr_err("HeaderDigest CRC32C failed,"
4142 " received 0x%08x, computed 0x%08x\n",
4143 digest, checksum);
4144 /*
4145 * Set the PDU to 0xff so it will intentionally
4146 * hit default in the switch below.
4147 */
4148 memset(buffer, 0xff, ISCSI_HDR_LEN);
04f3b31b 4149 atomic_long_inc(&conn->sess->conn_digest_errors);
e48354ce
NB		 4150 } else {
4151 pr_debug("Got HeaderDigest CRC32C"
4152 " 0x%08x\n", checksum);
4153 }
4154 }
4155
4156 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4157 goto transport_err;
4158
4159 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4160
4161 if (conn->sess->sess_ops->SessionType &&
4162 ((!(opcode & ISCSI_OP_TEXT)) ||
4163 (!(opcode & ISCSI_OP_LOGOUT)))) {
4164 pr_err("Received illegal iSCSI Opcode: 0x%02x"
4165 " while in Discovery Session, rejecting.\n", opcode);
ba159914
NB		 4166 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4167 buffer);
e48354ce
NB		 4168 goto transport_err;
4169 }
4170
3e1c81a9
NB		 4171 ret = iscsi_target_rx_opcode(conn, buffer);
4172 if (ret < 0)
4173 goto transport_err;
e48354ce
NB		 4174 }
4175
4176transport_err:
4177 if (!signal_pending(current))
4178 atomic_set(&conn->transport_failed, 1);
4179 iscsit_take_action_for_connection_exit(conn);
e48354ce
NB		 4180 return 0;
4181}
4182
4183static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4184{
4185 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4186 struct iscsi_session *sess = conn->sess;
e48354ce
NB		 4187 /*
4188 * We expect this function to only ever be called from either RX or TX
4189 * thread context via iscsit_close_connection() once the other context
4190 * has been reset -> returned sleeping pre-handler state.
4191 */
4192 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4193 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
e48354ce 4194
5159d763 4195 list_del_init(&cmd->i_conn_node);
e48354ce
NB		 4196 spin_unlock_bh(&conn->cmd_lock);
4197
4198 iscsit_increment_maxcmdsn(cmd, sess);
e48354ce 4199
aafc9d15 4200 iscsit_free_cmd(cmd, true);
e48354ce
NB		 4201
4202 spin_lock_bh(&conn->cmd_lock);
4203 }
4204 spin_unlock_bh(&conn->cmd_lock);
4205}
4206
4207static void iscsit_stop_timers_for_cmds(
4208 struct iscsi_conn *conn)
4209{
4210 struct iscsi_cmd *cmd;
4211
4212 spin_lock_bh(&conn->cmd_lock);
2fbb471e 4213 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 4214 if (cmd->data_direction == DMA_TO_DEVICE)
4215 iscsit_stop_dataout_timer(cmd);
4216 }
4217 spin_unlock_bh(&conn->cmd_lock);
4218}
4219
4220int iscsit_close_connection(
4221 struct iscsi_conn *conn)
4222{
4223 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4224 struct iscsi_session *sess = conn->sess;
4225
4226 pr_debug("Closing iSCSI connection CID %hu on SID:"
4227 " %u\n", conn->cid, sess->sid);
4228 /*
4229 * Always up conn_logout_comp just in case the RX Thread is sleeping
4230 * and the logout response never got sent because the connection
4231 * failed.
4232 */
4233 complete(&conn->conn_logout_comp);
4234
88dcd2da
NB		 4235 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4236 if (conn->tx_thread &&
4237 cmpxchg(&conn->tx_thread_active, true, false)) {
4238 send_sig(SIGINT, conn->tx_thread, 1);
4239 kthread_stop(conn->tx_thread);
4240 }
4241 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4242 if (conn->rx_thread &&
4243 cmpxchg(&conn->rx_thread_active, true, false)) {
4244 send_sig(SIGINT, conn->rx_thread, 1);
4245 kthread_stop(conn->rx_thread);
4246 }
4247 }
4248
4249 spin_lock(&iscsit_global->ts_bitmap_lock);
4250 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4251 get_order(1));
4252 spin_unlock(&iscsit_global->ts_bitmap_lock);
e48354ce
NB		 4253
4254 iscsit_stop_timers_for_cmds(conn);
4255 iscsit_stop_nopin_response_timer(conn);
4256 iscsit_stop_nopin_timer(conn);
defd8848
NB		 4257
4258 if (conn->conn_transport->iscsit_wait_conn)
4259 conn->conn_transport->iscsit_wait_conn(conn);
4260
e48354ce
NB		 4261 /*
4262 * During Connection recovery drop unacknowledged out of order
4263 * commands for this connection, and prepare the other commands
4264 * for realligence.
4265 *
4266 * During normal operation clear the out of order commands (but
4267 * do not free the struct iscsi_ooo_cmdsn's) and release all
4268 * struct iscsi_cmds.
4269 */
4270 if (atomic_read(&conn->connection_recovery)) {
4271 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4272 iscsit_prepare_cmds_for_realligance(conn);
4273 } else {
4274 iscsit_clear_ooo_cmdsns_for_conn(conn);
4275 iscsit_release_commands_from_conn(conn);
4276 }
bbc05048 4277 iscsit_free_queue_reqs_for_conn(conn);
e48354ce
NB		 4278
4279 /*
4280 * Handle decrementing session or connection usage count if
4281 * a logout response was not able to be sent because the
4282 * connection failed. Fall back to Session Recovery here.
4283 */
4284 if (atomic_read(&conn->conn_logout_remove)) {
4285 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4286 iscsit_dec_conn_usage_count(conn);
4287 iscsit_dec_session_usage_count(sess);
4288 }
4289 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4290 iscsit_dec_conn_usage_count(conn);
4291
4292 atomic_set(&conn->conn_logout_remove, 0);
4293 atomic_set(&sess->session_reinstatement, 0);
4294 atomic_set(&sess->session_fall_back_to_erl0, 1);
4295 }
4296
4297 spin_lock_bh(&sess->conn_lock);
4298 list_del(&conn->conn_list);
4299
4300 /*
4301 * Attempt to let the Initiator know this connection failed by
4302 * sending an Connection Dropped Async Message on another
4303 * active connection.
4304 */
4305 if (atomic_read(&conn->connection_recovery))
4306 iscsit_build_conn_drop_async_message(conn);
4307
4308 spin_unlock_bh(&sess->conn_lock);
4309
4310 /*
4311 * If connection reinstatement is being performed on this connection,
4312 * up the connection reinstatement semaphore that is being blocked on
4313 * in iscsit_cause_connection_reinstatement().
4314 */
4315 spin_lock_bh(&conn->state_lock);
4316 if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4317 spin_unlock_bh(&conn->state_lock);
4318 complete(&conn->conn_wait_comp);
4319 wait_for_completion(&conn->conn_post_wait_comp);
4320 spin_lock_bh(&conn->state_lock);
4321 }
4322
4323 /*
4324 * If connection reinstatement is being performed on this connection
4325 * by receiving a REMOVECONNFORRECOVERY logout request, up the
4326 * connection wait rcfr semaphore that is being blocked on
4327 * an iscsit_connection_reinstatement_rcfr().
4328 */
4329 if (atomic_read(&conn->connection_wait_rcfr)) {
4330 spin_unlock_bh(&conn->state_lock);
4331 complete(&conn->conn_wait_rcfr_comp);
4332 wait_for_completion(&conn->conn_post_wait_comp);
4333 spin_lock_bh(&conn->state_lock);
4334 }
4335 atomic_set(&conn->connection_reinstatement, 1);
4336 spin_unlock_bh(&conn->state_lock);
4337
4338 /*
4339 * If any other processes are accessing this connection pointer we
4340 * must wait until they have completed.
4341 */
4342 iscsit_check_conn_usage_count(conn);
4343
4344 if (conn->conn_rx_hash.tfm)
4345 crypto_free_hash(conn->conn_rx_hash.tfm);
4346 if (conn->conn_tx_hash.tfm)
4347 crypto_free_hash(conn->conn_tx_hash.tfm);
4348
fbecb659 4349 free_cpumask_var(conn->conn_cpumask);
e48354ce
NB		 4350
4351 kfree(conn->conn_ops);
4352 conn->conn_ops = NULL;
4353
bf6932f4 4354 if (conn->sock)
e48354ce 4355 sock_release(conn->sock);
baa4d64b
NB		 4356
4357 if (conn->conn_transport->iscsit_free_conn)
4358 conn->conn_transport->iscsit_free_conn(conn);
4359
4360 iscsit_put_transport(conn->conn_transport);
4361
e48354ce
NB		 4362 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4363 conn->conn_state = TARG_CONN_STATE_FREE;
4364 kfree(conn);
4365
4366 spin_lock_bh(&sess->conn_lock);
4367 atomic_dec(&sess->nconn);
4368 pr_debug("Decremented iSCSI connection count to %hu from node:"
4369 " %s\n", atomic_read(&sess->nconn),
4370 sess->sess_ops->InitiatorName);
4371 /*
4372 * Make sure that if one connection fails in an non ERL=2 iSCSI
4373 * Session that they all fail.
4374 */
4375 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4376 !atomic_read(&sess->session_logout))
4377 atomic_set(&sess->session_fall_back_to_erl0, 1);
4378
4379 /*
4380 * If this was not the last connection in the session, and we are
4381 * performing session reinstatement or falling back to ERL=0, call
4382 * iscsit_stop_session() without sleeping to shutdown the other
4383 * active connections.
4384 */
4385 if (atomic_read(&sess->nconn)) {
4386 if (!atomic_read(&sess->session_reinstatement) &&
4387 !atomic_read(&sess->session_fall_back_to_erl0)) {
4388 spin_unlock_bh(&sess->conn_lock);
4389 return 0;
4390 }
4391 if (!atomic_read(&sess->session_stop_active)) {
4392 atomic_set(&sess->session_stop_active, 1);
4393 spin_unlock_bh(&sess->conn_lock);
4394 iscsit_stop_session(sess, 0, 0);
4395 return 0;
4396 }
4397 spin_unlock_bh(&sess->conn_lock);
4398 return 0;
4399 }
4400
4401 /*
4402 * If this was the last connection in the session and one of the
4403 * following is occurring:
4404 *
4405 * Session Reinstatement is not being performed, and are falling back
4406 * to ERL=0 call iscsit_close_session().
4407 *
4408 * Session Logout was requested. iscsit_close_session() will be called
4409 * elsewhere.
4410 *
4411 * Session Continuation is not being performed, start the Time2Retain
4412 * handler and check if sleep_on_sess_wait_sem is active.
4413 */
4414 if (!atomic_read(&sess->session_reinstatement) &&
4415 atomic_read(&sess->session_fall_back_to_erl0)) {
4416 spin_unlock_bh(&sess->conn_lock);
99367f01 4417 target_put_session(sess->se_sess);
e48354ce
NB		 4418
4419 return 0;
4420 } else if (atomic_read(&sess->session_logout)) {
4421 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4422 sess->session_state = TARG_SESS_STATE_FREE;
4423 spin_unlock_bh(&sess->conn_lock);
4424
4425 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4426 complete(&sess->session_wait_comp);
4427
4428 return 0;
4429 } else {
4430 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4431 sess->session_state = TARG_SESS_STATE_FAILED;
4432
4433 if (!atomic_read(&sess->session_continuation)) {
4434 spin_unlock_bh(&sess->conn_lock);
4435 iscsit_start_time2retain_handler(sess);
4436 } else
4437 spin_unlock_bh(&sess->conn_lock);
4438
4439 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4440 complete(&sess->session_wait_comp);
4441
4442 return 0;
4443 }
4444 spin_unlock_bh(&sess->conn_lock);
4445
4446 return 0;
4447}
4448
4449int iscsit_close_session(struct iscsi_session *sess)
4450{
60bfcf8e 4451 struct iscsi_portal_group *tpg = sess->tpg;
e48354ce
NB		 4452 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4453
4454 if (atomic_read(&sess->nconn)) {
4455 pr_err("%d connection(s) still exist for iSCSI session"
4456 " to %s\n", atomic_read(&sess->nconn),
4457 sess->sess_ops->InitiatorName);
4458 BUG();
4459 }
4460
4461 spin_lock_bh(&se_tpg->session_lock);
4462 atomic_set(&sess->session_logout, 1);
4463 atomic_set(&sess->session_reinstatement, 1);
4464 iscsit_stop_time2retain_timer(sess);
4465 spin_unlock_bh(&se_tpg->session_lock);
4466
4467 /*
4468 * transport_deregister_session_configfs() will clear the
4469 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4470 * can be setting it again with __transport_register_session() in
4471 * iscsi_post_login_handler() again after the iscsit_stop_session()
4472 * completes in iscsi_np context.
4473 */
4474 transport_deregister_session_configfs(sess->se_sess);
4475
4476 /*
4477 * If any other processes are accessing this session pointer we must
4478 * wait until they have completed. If we are in an interrupt (the
4479 * time2retain handler) and contain and active session usage count we
4480 * restart the timer and exit.
4481 */
4482 if (!in_interrupt()) {
4483 if (iscsit_check_session_usage_count(sess) == 1)
4484 iscsit_stop_session(sess, 1, 1);
4485 } else {
4486 if (iscsit_check_session_usage_count(sess) == 2) {
4487 atomic_set(&sess->session_logout, 0);
4488 iscsit_start_time2retain_handler(sess);
4489 return 0;
4490 }
4491 }
4492
4493 transport_deregister_session(sess->se_sess);
4494
4495 if (sess->sess_ops->ErrorRecoveryLevel == 2)
4496 iscsit_free_connection_recovery_entires(sess);
4497
4498 iscsit_free_all_ooo_cmdsns(sess);
4499
4500 spin_lock_bh(&se_tpg->session_lock);
4501 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4502 sess->session_state = TARG_SESS_STATE_FREE;
4503 pr_debug("Released iSCSI session from node: %s\n",
4504 sess->sess_ops->InitiatorName);
4505 tpg->nsessions--;
4506 if (tpg->tpg_tiqn)
4507 tpg->tpg_tiqn->tiqn_nsessions--;
4508
4509 pr_debug("Decremented number of active iSCSI Sessions on"
4510 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4511
4512 spin_lock(&sess_idr_lock);
4513 idr_remove(&sess_idr, sess->session_index);
4514 spin_unlock(&sess_idr_lock);
4515
4516 kfree(sess->sess_ops);
4517 sess->sess_ops = NULL;
4518 spin_unlock_bh(&se_tpg->session_lock);
4519
4520 kfree(sess);
4521 return 0;
4522}
4523
4524static void iscsit_logout_post_handler_closesession(
4525 struct iscsi_conn *conn)
4526{
4527 struct iscsi_session *sess = conn->sess;
88dcd2da 4528 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4529
4530 atomic_set(&conn->conn_logout_remove, 0);
4531 complete(&conn->conn_logout_comp);
4532
4533 iscsit_dec_conn_usage_count(conn);
88dcd2da 4534 iscsit_stop_session(sess, sleep, sleep);
e48354ce 4535 iscsit_dec_session_usage_count(sess);
99367f01 4536 target_put_session(sess->se_sess);
e48354ce
NB		 4537}
4538
4539static void iscsit_logout_post_handler_samecid(
4540 struct iscsi_conn *conn)
4541{
88dcd2da 4542 int sleep = cmpxchg(&conn->tx_thread_active, true, false);
e48354ce
NB		 4543
4544 atomic_set(&conn->conn_logout_remove, 0);
4545 complete(&conn->conn_logout_comp);
4546
88dcd2da 4547 iscsit_cause_connection_reinstatement(conn, sleep);
e48354ce
NB		 4548 iscsit_dec_conn_usage_count(conn);
4549}
4550
4551static void iscsit_logout_post_handler_diffcid(
4552 struct iscsi_conn *conn,
4553 u16 cid)
4554{
4555 struct iscsi_conn *l_conn;
4556 struct iscsi_session *sess = conn->sess;
b53b0d99 4557 bool conn_found = false;
e48354ce
NB		 4558
4559 if (!sess)
4560 return;
4561
4562 spin_lock_bh(&sess->conn_lock);
4563 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4564 if (l_conn->cid == cid) {
4565 iscsit_inc_conn_usage_count(l_conn);
b53b0d99 4566 conn_found = true;
e48354ce
NB		 4567 break;
4568 }
4569 }
4570 spin_unlock_bh(&sess->conn_lock);
4571
b53b0d99 4572 if (!conn_found)
e48354ce
NB		 4573 return;
4574
4575 if (l_conn->sock)
4576 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4577
4578 spin_lock_bh(&l_conn->state_lock);
4579 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4580 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4581 spin_unlock_bh(&l_conn->state_lock);
4582
4583 iscsit_cause_connection_reinstatement(l_conn, 1);
4584 iscsit_dec_conn_usage_count(l_conn);
4585}
4586
4587/*
4588 * Return of 0 causes the TX thread to restart.
4589 */
2ec5a8c1 4590int iscsit_logout_post_handler(
e48354ce
NB		 4591 struct iscsi_cmd *cmd,
4592 struct iscsi_conn *conn)
4593{
4594 int ret = 0;
4595
4596 switch (cmd->logout_reason) {
4597 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4598 switch (cmd->logout_response) {
4599 case ISCSI_LOGOUT_SUCCESS:
4600 case ISCSI_LOGOUT_CLEANUP_FAILED:
4601 default:
4602 iscsit_logout_post_handler_closesession(conn);
4603 break;
4604 }
4605 ret = 0;
4606 break;
4607 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4608 if (conn->cid == cmd->logout_cid) {
4609 switch (cmd->logout_response) {
4610 case ISCSI_LOGOUT_SUCCESS:
4611 case ISCSI_LOGOUT_CLEANUP_FAILED:
4612 default:
4613 iscsit_logout_post_handler_samecid(conn);
4614 break;
4615 }
4616 ret = 0;
4617 } else {
4618 switch (cmd->logout_response) {
4619 case ISCSI_LOGOUT_SUCCESS:
4620 iscsit_logout_post_handler_diffcid(conn,
4621 cmd->logout_cid);
4622 break;
4623 case ISCSI_LOGOUT_CID_NOT_FOUND:
4624 case ISCSI_LOGOUT_CLEANUP_FAILED:
4625 default:
4626 break;
4627 }
4628 ret = 1;
4629 }
4630 break;
4631 case ISCSI_LOGOUT_REASON_RECOVERY:
4632 switch (cmd->logout_response) {
4633 case ISCSI_LOGOUT_SUCCESS:
4634 case ISCSI_LOGOUT_CID_NOT_FOUND:
4635 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4636 case ISCSI_LOGOUT_CLEANUP_FAILED:
4637 default:
4638 break;
4639 }
4640 ret = 1;
4641 break;
4642 default:
4643 break;
4644
4645 }
4646 return ret;
4647}
2ec5a8c1 4648EXPORT_SYMBOL(iscsit_logout_post_handler);
e48354ce
NB		 4649
4650void iscsit_fail_session(struct iscsi_session *sess)
4651{
4652 struct iscsi_conn *conn;
4653
4654 spin_lock_bh(&sess->conn_lock);
4655 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4656 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4657 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4658 }
4659 spin_unlock_bh(&sess->conn_lock);
4660
4661 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4662 sess->session_state = TARG_SESS_STATE_FAILED;
4663}
4664
4665int iscsit_free_session(struct iscsi_session *sess)
4666{
4667 u16 conn_count = atomic_read(&sess->nconn);
4668 struct iscsi_conn *conn, *conn_tmp = NULL;
4669 int is_last;
4670
4671 spin_lock_bh(&sess->conn_lock);
4672 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4673
4674 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4675 conn_list) {
4676 if (conn_count == 0)
4677 break;
4678
4679 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4680 is_last = 1;
4681 } else {
4682 iscsit_inc_conn_usage_count(conn_tmp);
4683 is_last = 0;
4684 }
4685 iscsit_inc_conn_usage_count(conn);
4686
4687 spin_unlock_bh(&sess->conn_lock);
4688 iscsit_cause_connection_reinstatement(conn, 1);
4689 spin_lock_bh(&sess->conn_lock);
4690
4691 iscsit_dec_conn_usage_count(conn);
4692 if (is_last == 0)
4693 iscsit_dec_conn_usage_count(conn_tmp);
4694
4695 conn_count--;
4696 }
4697
4698 if (atomic_read(&sess->nconn)) {
4699 spin_unlock_bh(&sess->conn_lock);
4700 wait_for_completion(&sess->session_wait_comp);
4701 } else
4702 spin_unlock_bh(&sess->conn_lock);
4703
99367f01 4704 target_put_session(sess->se_sess);
e48354ce
NB		 4705 return 0;
4706}
4707
4708void iscsit_stop_session(
4709 struct iscsi_session *sess,
4710 int session_sleep,
4711 int connection_sleep)
4712{
4713 u16 conn_count = atomic_read(&sess->nconn);
4714 struct iscsi_conn *conn, *conn_tmp = NULL;
4715 int is_last;
4716
4717 spin_lock_bh(&sess->conn_lock);
4718 if (session_sleep)
4719 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4720
4721 if (connection_sleep) {
4722 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4723 conn_list) {
4724 if (conn_count == 0)
4725 break;
4726
4727 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4728 is_last = 1;
4729 } else {
4730 iscsit_inc_conn_usage_count(conn_tmp);
4731 is_last = 0;
4732 }
4733 iscsit_inc_conn_usage_count(conn);
4734
4735 spin_unlock_bh(&sess->conn_lock);
4736 iscsit_cause_connection_reinstatement(conn, 1);
4737 spin_lock_bh(&sess->conn_lock);
4738
4739 iscsit_dec_conn_usage_count(conn);
4740 if (is_last == 0)
4741 iscsit_dec_conn_usage_count(conn_tmp);
4742 conn_count--;
4743 }
4744 } else {
4745 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4746 iscsit_cause_connection_reinstatement(conn, 0);
4747 }
4748
4749 if (session_sleep && atomic_read(&sess->nconn)) {
4750 spin_unlock_bh(&sess->conn_lock);
4751 wait_for_completion(&sess->session_wait_comp);
4752 } else
4753 spin_unlock_bh(&sess->conn_lock);
4754}
4755
4756int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4757{
4758 struct iscsi_session *sess;
4759 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4760 struct se_session *se_sess, *se_sess_tmp;
4761 int session_count = 0;
4762
4763 spin_lock_bh(&se_tpg->session_lock);
4764 if (tpg->nsessions && !force) {
4765 spin_unlock_bh(&se_tpg->session_lock);
4766 return -1;
4767 }
4768
4769 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4770 sess_list) {
4771 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4772
4773 spin_lock(&sess->conn_lock);
4774 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4775 atomic_read(&sess->session_logout) ||
4776 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4777 spin_unlock(&sess->conn_lock);
4778 continue;
4779 }
4780 atomic_set(&sess->session_reinstatement, 1);
4781 spin_unlock(&sess->conn_lock);
4782 spin_unlock_bh(&se_tpg->session_lock);
4783
4784 iscsit_free_session(sess);
4785 spin_lock_bh(&se_tpg->session_lock);
4786
4787 session_count++;
4788 }
4789 spin_unlock_bh(&se_tpg->session_lock);
4790
4791 pr_debug("Released %d iSCSI Session(s) from Target Portal"
4792 " Group: %hu\n", session_count, tpg->tpgt);
4793 return 0;
4794}
4795
4796MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4797MODULE_VERSION("4.1.x");
4798MODULE_AUTHOR("nab@Linux-iSCSI.org");
4799MODULE_LICENSE("GPL");
4800
4801module_init(iscsi_target_init_module);
4802module_exit(iscsi_target_cleanup_module);
Linux kernel - Deliverables
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