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e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains main functions related to the iSCSI Target Core Driver. | |
3 | * | |
4 | * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. | |
5 | * | |
6 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
7 | * | |
8 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | ******************************************************************************/ | |
20 | ||
21 | #include <linux/string.h> | |
22 | #include <linux/kthread.h> | |
23 | #include <linux/crypto.h> | |
24 | #include <linux/completion.h> | |
25 | #include <asm/unaligned.h> | |
26 | #include <scsi/scsi_device.h> | |
27 | #include <scsi/iscsi_proto.h> | |
28 | #include <target/target_core_base.h> | |
29 | #include <target/target_core_tmr.h> | |
30 | #include <target/target_core_transport.h> | |
31 | ||
32 | #include "iscsi_target_core.h" | |
33 | #include "iscsi_target_parameters.h" | |
34 | #include "iscsi_target_seq_pdu_list.h" | |
35 | #include "iscsi_target_tq.h" | |
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" | |
47 | #include "iscsi_target_stat.h" | |
48 | ||
49 | static LIST_HEAD(g_tiqn_list); | |
50 | static LIST_HEAD(g_np_list); | |
51 | static DEFINE_SPINLOCK(tiqn_lock); | |
52 | static DEFINE_SPINLOCK(np_lock); | |
53 | ||
54 | static struct idr tiqn_idr; | |
55 | struct idr sess_idr; | |
56 | struct mutex auth_id_lock; | |
57 | spinlock_t sess_idr_lock; | |
58 | ||
59 | struct iscsit_global *iscsit_global; | |
60 | ||
61 | struct kmem_cache *lio_cmd_cache; | |
62 | struct kmem_cache *lio_qr_cache; | |
63 | struct kmem_cache *lio_dr_cache; | |
64 | struct kmem_cache *lio_ooo_cache; | |
65 | struct kmem_cache *lio_r2t_cache; | |
66 | ||
67 | static int iscsit_handle_immediate_data(struct iscsi_cmd *, | |
68 | unsigned char *buf, u32); | |
69 | static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *); | |
70 | ||
71 | struct 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 | ||
94 | static 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 | ||
107 | void 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 | */ | |
118 | struct 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 | ||
144 | if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) { | |
145 | pr_err("idr_pre_get() for tiqn_idr failed\n"); | |
146 | kfree(tiqn); | |
147 | return ERR_PTR(-ENOMEM); | |
148 | } | |
149 | tiqn->tiqn_state = TIQN_STATE_ACTIVE; | |
150 | ||
151 | spin_lock(&tiqn_lock); | |
152 | ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index); | |
153 | if (ret < 0) { | |
154 | pr_err("idr_get_new() failed for tiqn->tiqn_index\n"); | |
155 | spin_unlock(&tiqn_lock); | |
156 | kfree(tiqn); | |
157 | return ERR_PTR(ret); | |
158 | } | |
159 | list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); | |
160 | spin_unlock(&tiqn_lock); | |
161 | ||
162 | pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); | |
163 | ||
164 | return tiqn; | |
165 | ||
166 | } | |
167 | ||
168 | static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) | |
169 | { | |
170 | /* | |
171 | * Wait for accesses to said struct iscsi_tiqn to end. | |
172 | */ | |
173 | spin_lock(&tiqn->tiqn_state_lock); | |
174 | while (tiqn->tiqn_access_count != 0) { | |
175 | spin_unlock(&tiqn->tiqn_state_lock); | |
176 | msleep(10); | |
177 | spin_lock(&tiqn->tiqn_state_lock); | |
178 | } | |
179 | spin_unlock(&tiqn->tiqn_state_lock); | |
180 | } | |
181 | ||
182 | void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) | |
183 | { | |
184 | /* | |
185 | * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN | |
186 | * while holding tiqn->tiqn_state_lock. This means that all subsequent | |
187 | * attempts to access this struct iscsi_tiqn will fail from both transport | |
188 | * fabric and control code paths. | |
189 | */ | |
190 | if (iscsit_set_tiqn_shutdown(tiqn) < 0) { | |
191 | pr_err("iscsit_set_tiqn_shutdown() failed\n"); | |
192 | return; | |
193 | } | |
194 | ||
195 | iscsit_wait_for_tiqn(tiqn); | |
196 | ||
197 | spin_lock(&tiqn_lock); | |
198 | list_del(&tiqn->tiqn_list); | |
199 | idr_remove(&tiqn_idr, tiqn->tiqn_index); | |
200 | spin_unlock(&tiqn_lock); | |
201 | ||
202 | pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", | |
203 | tiqn->tiqn); | |
204 | kfree(tiqn); | |
205 | } | |
206 | ||
207 | int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) | |
208 | { | |
209 | int ret; | |
210 | /* | |
211 | * Determine if the network portal is accepting storage traffic. | |
212 | */ | |
213 | spin_lock_bh(&np->np_thread_lock); | |
214 | if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { | |
215 | spin_unlock_bh(&np->np_thread_lock); | |
216 | return -1; | |
217 | } | |
218 | if (np->np_login_tpg) { | |
219 | pr_err("np->np_login_tpg() is not NULL!\n"); | |
220 | spin_unlock_bh(&np->np_thread_lock); | |
221 | return -1; | |
222 | } | |
223 | spin_unlock_bh(&np->np_thread_lock); | |
224 | /* | |
225 | * Determine if the portal group is accepting storage traffic. | |
226 | */ | |
227 | spin_lock_bh(&tpg->tpg_state_lock); | |
228 | if (tpg->tpg_state != TPG_STATE_ACTIVE) { | |
229 | spin_unlock_bh(&tpg->tpg_state_lock); | |
230 | return -1; | |
231 | } | |
232 | spin_unlock_bh(&tpg->tpg_state_lock); | |
233 | ||
234 | /* | |
235 | * Here we serialize access across the TIQN+TPG Tuple. | |
236 | */ | |
237 | ret = mutex_lock_interruptible(&tpg->np_login_lock); | |
238 | if ((ret != 0) || signal_pending(current)) | |
239 | return -1; | |
240 | ||
241 | spin_lock_bh(&np->np_thread_lock); | |
242 | np->np_login_tpg = tpg; | |
243 | spin_unlock_bh(&np->np_thread_lock); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) | |
249 | { | |
250 | struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; | |
251 | ||
252 | spin_lock_bh(&np->np_thread_lock); | |
253 | np->np_login_tpg = NULL; | |
254 | spin_unlock_bh(&np->np_thread_lock); | |
255 | ||
256 | mutex_unlock(&tpg->np_login_lock); | |
257 | ||
258 | if (tiqn) | |
259 | iscsit_put_tiqn_for_login(tiqn); | |
260 | ||
261 | return 0; | |
262 | } | |
263 | ||
264 | static struct iscsi_np *iscsit_get_np( | |
265 | struct __kernel_sockaddr_storage *sockaddr, | |
266 | int network_transport) | |
267 | { | |
268 | struct sockaddr_in *sock_in, *sock_in_e; | |
269 | struct sockaddr_in6 *sock_in6, *sock_in6_e; | |
270 | struct iscsi_np *np; | |
271 | int ip_match = 0; | |
272 | u16 port; | |
273 | ||
274 | spin_lock_bh(&np_lock); | |
275 | list_for_each_entry(np, &g_np_list, np_list) { | |
276 | spin_lock(&np->np_thread_lock); | |
277 | if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { | |
278 | spin_unlock(&np->np_thread_lock); | |
279 | continue; | |
280 | } | |
281 | ||
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((void *)&sock_in6->sin6_addr.in6_u, | |
287 | (void *)&sock_in6_e->sin6_addr.in6_u, | |
288 | sizeof(struct in6_addr))) | |
289 | ip_match = 1; | |
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 == | |
297 | sock_in_e->sin_addr.s_addr) | |
298 | ip_match = 1; | |
299 | ||
300 | port = ntohs(sock_in->sin_port); | |
301 | } | |
302 | ||
303 | if ((ip_match == 1) && (np->np_port == port) && | |
304 | (np->np_network_transport == network_transport)) { | |
305 | /* | |
306 | * Increment the np_exports reference count now to | |
307 | * prevent iscsit_del_np() below from being called | |
308 | * while iscsi_tpg_add_network_portal() is called. | |
309 | */ | |
310 | np->np_exports++; | |
311 | spin_unlock(&np->np_thread_lock); | |
312 | spin_unlock_bh(&np_lock); | |
313 | return np; | |
314 | } | |
315 | spin_unlock(&np->np_thread_lock); | |
316 | } | |
317 | spin_unlock_bh(&np_lock); | |
318 | ||
319 | return NULL; | |
320 | } | |
321 | ||
322 | struct iscsi_np *iscsit_add_np( | |
323 | struct __kernel_sockaddr_storage *sockaddr, | |
324 | char *ip_str, | |
325 | int network_transport) | |
326 | { | |
327 | struct sockaddr_in *sock_in; | |
328 | struct sockaddr_in6 *sock_in6; | |
329 | struct iscsi_np *np; | |
330 | int ret; | |
331 | /* | |
332 | * Locate the existing struct iscsi_np if already active.. | |
333 | */ | |
334 | np = iscsit_get_np(sockaddr, network_transport); | |
335 | if (np) | |
336 | return np; | |
337 | ||
338 | np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); | |
339 | if (!np) { | |
340 | pr_err("Unable to allocate memory for struct iscsi_np\n"); | |
341 | return ERR_PTR(-ENOMEM); | |
342 | } | |
343 | ||
344 | np->np_flags |= NPF_IP_NETWORK; | |
345 | if (sockaddr->ss_family == AF_INET6) { | |
346 | sock_in6 = (struct sockaddr_in6 *)sockaddr; | |
347 | snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); | |
348 | np->np_port = ntohs(sock_in6->sin6_port); | |
349 | } else { | |
350 | sock_in = (struct sockaddr_in *)sockaddr; | |
351 | sprintf(np->np_ip, "%s", ip_str); | |
352 | np->np_port = ntohs(sock_in->sin_port); | |
353 | } | |
354 | ||
355 | np->np_network_transport = network_transport; | |
356 | spin_lock_init(&np->np_thread_lock); | |
357 | init_completion(&np->np_restart_comp); | |
358 | INIT_LIST_HEAD(&np->np_list); | |
359 | ||
360 | ret = iscsi_target_setup_login_socket(np, sockaddr); | |
361 | if (ret != 0) { | |
362 | kfree(np); | |
363 | return ERR_PTR(ret); | |
364 | } | |
365 | ||
366 | np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); | |
367 | if (IS_ERR(np->np_thread)) { | |
368 | pr_err("Unable to create kthread: iscsi_np\n"); | |
369 | ret = PTR_ERR(np->np_thread); | |
370 | kfree(np); | |
371 | return ERR_PTR(ret); | |
372 | } | |
373 | /* | |
374 | * Increment the np_exports reference count now to prevent | |
375 | * iscsit_del_np() below from being run while a new call to | |
376 | * iscsi_tpg_add_network_portal() for a matching iscsi_np is | |
377 | * active. We don't need to hold np->np_thread_lock at this | |
378 | * point because iscsi_np has not been added to g_np_list yet. | |
379 | */ | |
380 | np->np_exports = 1; | |
381 | ||
382 | spin_lock_bh(&np_lock); | |
383 | list_add_tail(&np->np_list, &g_np_list); | |
384 | spin_unlock_bh(&np_lock); | |
385 | ||
386 | pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", | |
387 | np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? | |
388 | "TCP" : "SCTP"); | |
389 | ||
390 | return np; | |
391 | } | |
392 | ||
393 | int iscsit_reset_np_thread( | |
394 | struct iscsi_np *np, | |
395 | struct iscsi_tpg_np *tpg_np, | |
396 | struct iscsi_portal_group *tpg) | |
397 | { | |
398 | spin_lock_bh(&np->np_thread_lock); | |
399 | if (tpg && tpg_np) { | |
400 | /* | |
401 | * The reset operation need only be performed when the | |
402 | * passed struct iscsi_portal_group has a login in progress | |
403 | * to one of the network portals. | |
404 | */ | |
405 | if (tpg_np->tpg_np->np_login_tpg != tpg) { | |
406 | spin_unlock_bh(&np->np_thread_lock); | |
407 | return 0; | |
408 | } | |
409 | } | |
410 | if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { | |
411 | spin_unlock_bh(&np->np_thread_lock); | |
412 | return 0; | |
413 | } | |
414 | np->np_thread_state = ISCSI_NP_THREAD_RESET; | |
415 | ||
416 | if (np->np_thread) { | |
417 | spin_unlock_bh(&np->np_thread_lock); | |
418 | send_sig(SIGINT, np->np_thread, 1); | |
419 | wait_for_completion(&np->np_restart_comp); | |
420 | spin_lock_bh(&np->np_thread_lock); | |
421 | } | |
422 | spin_unlock_bh(&np->np_thread_lock); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | int iscsit_del_np_comm(struct iscsi_np *np) | |
428 | { | |
429 | if (!np->np_socket) | |
430 | return 0; | |
431 | ||
432 | /* | |
433 | * Some network transports allocate their own struct sock->file, | |
434 | * see if we need to free any additional allocated resources. | |
435 | */ | |
436 | if (np->np_flags & NPF_SCTP_STRUCT_FILE) { | |
437 | kfree(np->np_socket->file); | |
438 | np->np_socket->file = NULL; | |
439 | } | |
440 | ||
441 | sock_release(np->np_socket); | |
442 | return 0; | |
443 | } | |
444 | ||
445 | int iscsit_del_np(struct iscsi_np *np) | |
446 | { | |
447 | spin_lock_bh(&np->np_thread_lock); | |
448 | np->np_exports--; | |
449 | if (np->np_exports) { | |
450 | spin_unlock_bh(&np->np_thread_lock); | |
451 | return 0; | |
452 | } | |
453 | np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; | |
454 | spin_unlock_bh(&np->np_thread_lock); | |
455 | ||
456 | if (np->np_thread) { | |
457 | /* | |
458 | * We need to send the signal to wakeup Linux/Net | |
459 | * which may be sleeping in sock_accept().. | |
460 | */ | |
461 | send_sig(SIGINT, np->np_thread, 1); | |
462 | kthread_stop(np->np_thread); | |
463 | } | |
464 | iscsit_del_np_comm(np); | |
465 | ||
466 | spin_lock_bh(&np_lock); | |
467 | list_del(&np->np_list); | |
468 | spin_unlock_bh(&np_lock); | |
469 | ||
470 | pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", | |
471 | np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? | |
472 | "TCP" : "SCTP"); | |
473 | ||
474 | kfree(np); | |
475 | return 0; | |
476 | } | |
477 | ||
478 | static int __init iscsi_target_init_module(void) | |
479 | { | |
480 | int ret = 0; | |
481 | ||
482 | pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); | |
483 | ||
484 | iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); | |
485 | if (!iscsit_global) { | |
486 | pr_err("Unable to allocate memory for iscsit_global\n"); | |
487 | return -1; | |
488 | } | |
489 | mutex_init(&auth_id_lock); | |
490 | spin_lock_init(&sess_idr_lock); | |
491 | idr_init(&tiqn_idr); | |
492 | idr_init(&sess_idr); | |
493 | ||
494 | ret = iscsi_target_register_configfs(); | |
495 | if (ret < 0) | |
496 | goto out; | |
497 | ||
498 | ret = iscsi_thread_set_init(); | |
499 | if (ret < 0) | |
500 | goto configfs_out; | |
501 | ||
502 | if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != | |
503 | TARGET_THREAD_SET_COUNT) { | |
504 | pr_err("iscsi_allocate_thread_sets() returned" | |
505 | " unexpected value!\n"); | |
506 | goto ts_out1; | |
507 | } | |
508 | ||
509 | lio_cmd_cache = kmem_cache_create("lio_cmd_cache", | |
510 | sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd), | |
511 | 0, NULL); | |
512 | if (!lio_cmd_cache) { | |
513 | pr_err("Unable to kmem_cache_create() for" | |
514 | " lio_cmd_cache\n"); | |
515 | goto ts_out2; | |
516 | } | |
517 | ||
518 | lio_qr_cache = kmem_cache_create("lio_qr_cache", | |
519 | sizeof(struct iscsi_queue_req), | |
520 | __alignof__(struct iscsi_queue_req), 0, NULL); | |
521 | if (!lio_qr_cache) { | |
522 | pr_err("nable to kmem_cache_create() for" | |
523 | " lio_qr_cache\n"); | |
524 | goto cmd_out; | |
525 | } | |
526 | ||
527 | lio_dr_cache = kmem_cache_create("lio_dr_cache", | |
528 | sizeof(struct iscsi_datain_req), | |
529 | __alignof__(struct iscsi_datain_req), 0, NULL); | |
530 | if (!lio_dr_cache) { | |
531 | pr_err("Unable to kmem_cache_create() for" | |
532 | " lio_dr_cache\n"); | |
533 | goto qr_out; | |
534 | } | |
535 | ||
536 | lio_ooo_cache = kmem_cache_create("lio_ooo_cache", | |
537 | sizeof(struct iscsi_ooo_cmdsn), | |
538 | __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); | |
539 | if (!lio_ooo_cache) { | |
540 | pr_err("Unable to kmem_cache_create() for" | |
541 | " lio_ooo_cache\n"); | |
542 | goto dr_out; | |
543 | } | |
544 | ||
545 | lio_r2t_cache = kmem_cache_create("lio_r2t_cache", | |
546 | sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), | |
547 | 0, NULL); | |
548 | if (!lio_r2t_cache) { | |
549 | pr_err("Unable to kmem_cache_create() for" | |
550 | " lio_r2t_cache\n"); | |
551 | goto ooo_out; | |
552 | } | |
553 | ||
554 | if (iscsit_load_discovery_tpg() < 0) | |
555 | goto r2t_out; | |
556 | ||
557 | return ret; | |
558 | r2t_out: | |
559 | kmem_cache_destroy(lio_r2t_cache); | |
560 | ooo_out: | |
561 | kmem_cache_destroy(lio_ooo_cache); | |
562 | dr_out: | |
563 | kmem_cache_destroy(lio_dr_cache); | |
564 | qr_out: | |
565 | kmem_cache_destroy(lio_qr_cache); | |
566 | cmd_out: | |
567 | kmem_cache_destroy(lio_cmd_cache); | |
568 | ts_out2: | |
569 | iscsi_deallocate_thread_sets(); | |
570 | ts_out1: | |
571 | iscsi_thread_set_free(); | |
572 | configfs_out: | |
573 | iscsi_target_deregister_configfs(); | |
574 | out: | |
575 | kfree(iscsit_global); | |
576 | return -ENOMEM; | |
577 | } | |
578 | ||
579 | static void __exit iscsi_target_cleanup_module(void) | |
580 | { | |
581 | iscsi_deallocate_thread_sets(); | |
582 | iscsi_thread_set_free(); | |
583 | iscsit_release_discovery_tpg(); | |
584 | kmem_cache_destroy(lio_cmd_cache); | |
585 | kmem_cache_destroy(lio_qr_cache); | |
586 | kmem_cache_destroy(lio_dr_cache); | |
587 | kmem_cache_destroy(lio_ooo_cache); | |
588 | kmem_cache_destroy(lio_r2t_cache); | |
589 | ||
590 | iscsi_target_deregister_configfs(); | |
591 | ||
592 | kfree(iscsit_global); | |
593 | } | |
594 | ||
595 | int iscsit_add_reject( | |
596 | u8 reason, | |
597 | int fail_conn, | |
598 | unsigned char *buf, | |
599 | struct iscsi_conn *conn) | |
600 | { | |
601 | struct iscsi_cmd *cmd; | |
602 | struct iscsi_reject *hdr; | |
603 | int ret; | |
604 | ||
605 | cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); | |
606 | if (!cmd) | |
607 | return -1; | |
608 | ||
609 | cmd->iscsi_opcode = ISCSI_OP_REJECT; | |
610 | if (fail_conn) | |
611 | cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; | |
612 | ||
613 | hdr = (struct iscsi_reject *) cmd->pdu; | |
614 | hdr->reason = reason; | |
615 | ||
616 | cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); | |
617 | if (!cmd->buf_ptr) { | |
618 | pr_err("Unable to allocate memory for cmd->buf_ptr\n"); | |
619 | iscsit_release_cmd(cmd); | |
620 | return -1; | |
621 | } | |
622 | memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN); | |
623 | ||
624 | spin_lock_bh(&conn->cmd_lock); | |
625 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
626 | spin_unlock_bh(&conn->cmd_lock); | |
627 | ||
628 | cmd->i_state = ISTATE_SEND_REJECT; | |
629 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
630 | ||
631 | ret = wait_for_completion_interruptible(&cmd->reject_comp); | |
632 | if (ret != 0) | |
633 | return -1; | |
634 | ||
635 | return (!fail_conn) ? 0 : -1; | |
636 | } | |
637 | ||
638 | int iscsit_add_reject_from_cmd( | |
639 | u8 reason, | |
640 | int fail_conn, | |
641 | int add_to_conn, | |
642 | unsigned char *buf, | |
643 | struct iscsi_cmd *cmd) | |
644 | { | |
645 | struct iscsi_conn *conn; | |
646 | struct iscsi_reject *hdr; | |
647 | int ret; | |
648 | ||
649 | if (!cmd->conn) { | |
650 | pr_err("cmd->conn is NULL for ITT: 0x%08x\n", | |
651 | cmd->init_task_tag); | |
652 | return -1; | |
653 | } | |
654 | conn = cmd->conn; | |
655 | ||
656 | cmd->iscsi_opcode = ISCSI_OP_REJECT; | |
657 | if (fail_conn) | |
658 | cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; | |
659 | ||
660 | hdr = (struct iscsi_reject *) cmd->pdu; | |
661 | hdr->reason = reason; | |
662 | ||
663 | cmd->buf_ptr = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL); | |
664 | if (!cmd->buf_ptr) { | |
665 | pr_err("Unable to allocate memory for cmd->buf_ptr\n"); | |
666 | iscsit_release_cmd(cmd); | |
667 | return -1; | |
668 | } | |
669 | memcpy(cmd->buf_ptr, buf, ISCSI_HDR_LEN); | |
670 | ||
671 | if (add_to_conn) { | |
672 | spin_lock_bh(&conn->cmd_lock); | |
673 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
674 | spin_unlock_bh(&conn->cmd_lock); | |
675 | } | |
676 | ||
677 | cmd->i_state = ISTATE_SEND_REJECT; | |
678 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
679 | ||
680 | ret = wait_for_completion_interruptible(&cmd->reject_comp); | |
681 | if (ret != 0) | |
682 | return -1; | |
683 | ||
684 | return (!fail_conn) ? 0 : -1; | |
685 | } | |
686 | ||
687 | /* | |
688 | * Map some portion of the allocated scatterlist to an iovec, suitable for | |
689 | * kernel sockets to copy data in/out. This handles both pages and slab-allocated | |
690 | * buffers, since we have been tricky and mapped t_mem_sg to the buffer in | |
691 | * either case (see iscsit_alloc_buffs) | |
692 | */ | |
693 | static int iscsit_map_iovec( | |
694 | struct iscsi_cmd *cmd, | |
695 | struct kvec *iov, | |
696 | u32 data_offset, | |
697 | u32 data_length) | |
698 | { | |
699 | u32 i = 0; | |
700 | struct scatterlist *sg; | |
701 | unsigned int page_off; | |
702 | ||
703 | /* | |
704 | * We have a private mapping of the allocated pages in t_mem_sg. | |
705 | * At this point, we also know each contains a page. | |
706 | */ | |
707 | sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE]; | |
708 | page_off = (data_offset % PAGE_SIZE); | |
709 | ||
710 | cmd->first_data_sg = sg; | |
711 | cmd->first_data_sg_off = page_off; | |
712 | ||
713 | while (data_length) { | |
714 | u32 cur_len = min_t(u32, data_length, sg->length - page_off); | |
715 | ||
716 | iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; | |
717 | iov[i].iov_len = cur_len; | |
718 | ||
719 | data_length -= cur_len; | |
720 | page_off = 0; | |
721 | sg = sg_next(sg); | |
722 | i++; | |
723 | } | |
724 | ||
725 | cmd->kmapped_nents = i; | |
726 | ||
727 | return i; | |
728 | } | |
729 | ||
730 | static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) | |
731 | { | |
732 | u32 i; | |
733 | struct scatterlist *sg; | |
734 | ||
735 | sg = cmd->first_data_sg; | |
736 | ||
737 | for (i = 0; i < cmd->kmapped_nents; i++) | |
738 | kunmap(sg_page(&sg[i])); | |
739 | } | |
740 | ||
741 | static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) | |
742 | { | |
743 | struct iscsi_cmd *cmd; | |
744 | ||
745 | conn->exp_statsn = exp_statsn; | |
746 | ||
747 | spin_lock_bh(&conn->cmd_lock); | |
748 | list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { | |
749 | spin_lock(&cmd->istate_lock); | |
750 | if ((cmd->i_state == ISTATE_SENT_STATUS) && | |
751 | (cmd->stat_sn < exp_statsn)) { | |
752 | cmd->i_state = ISTATE_REMOVE; | |
753 | spin_unlock(&cmd->istate_lock); | |
754 | iscsit_add_cmd_to_immediate_queue(cmd, conn, | |
755 | cmd->i_state); | |
756 | continue; | |
757 | } | |
758 | spin_unlock(&cmd->istate_lock); | |
759 | } | |
760 | spin_unlock_bh(&conn->cmd_lock); | |
761 | } | |
762 | ||
763 | static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) | |
764 | { | |
765 | u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 : | |
766 | cmd->se_cmd.t_data_nents; | |
767 | ||
768 | iov_count += TRANSPORT_IOV_DATA_BUFFER; | |
769 | ||
770 | cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); | |
771 | if (!cmd->iov_data) { | |
772 | pr_err("Unable to allocate cmd->iov_data\n"); | |
773 | return -ENOMEM; | |
774 | } | |
775 | ||
776 | cmd->orig_iov_data_count = iov_count; | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static int iscsit_alloc_buffs(struct iscsi_cmd *cmd) | |
781 | { | |
782 | struct scatterlist *sgl; | |
783 | u32 length = cmd->se_cmd.data_length; | |
784 | int nents = DIV_ROUND_UP(length, PAGE_SIZE); | |
785 | int i = 0, ret; | |
786 | /* | |
787 | * If no SCSI payload is present, allocate the default iovecs used for | |
788 | * iSCSI PDU Header | |
789 | */ | |
790 | if (!length) | |
791 | return iscsit_allocate_iovecs(cmd); | |
792 | ||
793 | sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL); | |
794 | if (!sgl) | |
795 | return -ENOMEM; | |
796 | ||
797 | sg_init_table(sgl, nents); | |
798 | ||
799 | while (length) { | |
800 | int buf_size = min_t(int, length, PAGE_SIZE); | |
801 | struct page *page; | |
802 | ||
803 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
804 | if (!page) | |
805 | goto page_alloc_failed; | |
806 | ||
807 | sg_set_page(&sgl[i], page, buf_size, 0); | |
808 | ||
809 | length -= buf_size; | |
810 | i++; | |
811 | } | |
812 | ||
813 | cmd->t_mem_sg = sgl; | |
814 | cmd->t_mem_sg_nents = nents; | |
815 | ||
816 | /* BIDI ops not supported */ | |
817 | ||
818 | /* Tell the core about our preallocated memory */ | |
819 | transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0); | |
820 | /* | |
821 | * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd | |
822 | * so that cmd->se_cmd.t_tasks_se_num has been set. | |
823 | */ | |
824 | ret = iscsit_allocate_iovecs(cmd); | |
825 | if (ret < 0) | |
826 | goto page_alloc_failed; | |
827 | ||
828 | return 0; | |
829 | ||
830 | page_alloc_failed: | |
831 | while (i >= 0) { | |
832 | __free_page(sg_page(&sgl[i])); | |
833 | i--; | |
834 | } | |
835 | kfree(cmd->t_mem_sg); | |
836 | cmd->t_mem_sg = NULL; | |
837 | return -ENOMEM; | |
838 | } | |
839 | ||
840 | static int iscsit_handle_scsi_cmd( | |
841 | struct iscsi_conn *conn, | |
842 | unsigned char *buf) | |
843 | { | |
844 | int data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret; | |
845 | int dump_immediate_data = 0, send_check_condition = 0, payload_length; | |
846 | struct iscsi_cmd *cmd = NULL; | |
847 | struct iscsi_scsi_req *hdr; | |
848 | ||
849 | spin_lock_bh(&conn->sess->session_stats_lock); | |
850 | conn->sess->cmd_pdus++; | |
851 | if (conn->sess->se_sess->se_node_acl) { | |
852 | spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
853 | conn->sess->se_sess->se_node_acl->num_cmds++; | |
854 | spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
855 | } | |
856 | spin_unlock_bh(&conn->sess->session_stats_lock); | |
857 | ||
858 | hdr = (struct iscsi_scsi_req *) buf; | |
859 | payload_length = ntoh24(hdr->dlength); | |
860 | hdr->itt = be32_to_cpu(hdr->itt); | |
861 | hdr->data_length = be32_to_cpu(hdr->data_length); | |
862 | hdr->cmdsn = be32_to_cpu(hdr->cmdsn); | |
863 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
864 | ||
865 | /* FIXME; Add checks for AdditionalHeaderSegment */ | |
866 | ||
867 | if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && | |
868 | !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { | |
869 | pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" | |
870 | " not set. Bad iSCSI Initiator.\n"); | |
871 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
872 | buf, conn); | |
873 | } | |
874 | ||
875 | if (((hdr->flags & ISCSI_FLAG_CMD_READ) || | |
876 | (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { | |
877 | /* | |
878 | * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) | |
879 | * that adds support for RESERVE/RELEASE. There is a bug | |
880 | * add with this new functionality that sets R/W bits when | |
881 | * neither CDB carries any READ or WRITE datapayloads. | |
882 | */ | |
883 | if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { | |
884 | hdr->flags &= ~ISCSI_FLAG_CMD_READ; | |
885 | hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; | |
886 | goto done; | |
887 | } | |
888 | ||
889 | pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" | |
890 | " set when Expected Data Transfer Length is 0 for" | |
891 | " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); | |
892 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
893 | buf, conn); | |
894 | } | |
895 | done: | |
896 | ||
897 | if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && | |
898 | !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { | |
899 | pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" | |
900 | " MUST be set if Expected Data Transfer Length is not 0." | |
901 | " Bad iSCSI Initiator\n"); | |
902 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
903 | buf, conn); | |
904 | } | |
905 | ||
906 | if ((hdr->flags & ISCSI_FLAG_CMD_READ) && | |
907 | (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { | |
908 | pr_err("Bidirectional operations not supported!\n"); | |
909 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
910 | buf, conn); | |
911 | } | |
912 | ||
913 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) { | |
914 | pr_err("Illegally set Immediate Bit in iSCSI Initiator" | |
915 | " Scsi Command PDU.\n"); | |
916 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
917 | buf, conn); | |
918 | } | |
919 | ||
920 | if (payload_length && !conn->sess->sess_ops->ImmediateData) { | |
921 | pr_err("ImmediateData=No but DataSegmentLength=%u," | |
922 | " protocol error.\n", payload_length); | |
923 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
924 | buf, conn); | |
925 | } | |
926 | ||
927 | if ((hdr->data_length == payload_length) && | |
928 | (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { | |
929 | pr_err("Expected Data Transfer Length and Length of" | |
930 | " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" | |
931 | " bit is not set protocol error\n"); | |
932 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
933 | buf, conn); | |
934 | } | |
935 | ||
936 | if (payload_length > hdr->data_length) { | |
937 | pr_err("DataSegmentLength: %u is greater than" | |
938 | " EDTL: %u, protocol error.\n", payload_length, | |
939 | hdr->data_length); | |
940 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
941 | buf, conn); | |
942 | } | |
943 | ||
944 | if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { | |
945 | pr_err("DataSegmentLength: %u is greater than" | |
946 | " MaxRecvDataSegmentLength: %u, protocol error.\n", | |
947 | payload_length, conn->conn_ops->MaxRecvDataSegmentLength); | |
948 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
949 | buf, conn); | |
950 | } | |
951 | ||
952 | if (payload_length > conn->sess->sess_ops->FirstBurstLength) { | |
953 | pr_err("DataSegmentLength: %u is greater than" | |
954 | " FirstBurstLength: %u, protocol error.\n", | |
955 | payload_length, conn->sess->sess_ops->FirstBurstLength); | |
956 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, | |
957 | buf, conn); | |
958 | } | |
959 | ||
960 | data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : | |
961 | (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : | |
962 | DMA_NONE; | |
963 | ||
964 | cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction, | |
965 | (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK)); | |
966 | if (!cmd) | |
967 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, | |
968 | buf, conn); | |
969 | ||
970 | pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," | |
971 | " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, | |
972 | hdr->cmdsn, hdr->data_length, payload_length, conn->cid); | |
973 | ||
974 | cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; | |
975 | cmd->i_state = ISTATE_NEW_CMD; | |
976 | cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); | |
977 | cmd->immediate_data = (payload_length) ? 1 : 0; | |
978 | cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && | |
979 | (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); | |
980 | if (cmd->unsolicited_data) | |
981 | cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; | |
982 | ||
983 | conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; | |
984 | if (hdr->flags & ISCSI_FLAG_CMD_READ) { | |
985 | spin_lock_bh(&conn->sess->ttt_lock); | |
986 | cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; | |
987 | if (cmd->targ_xfer_tag == 0xFFFFFFFF) | |
988 | cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; | |
989 | spin_unlock_bh(&conn->sess->ttt_lock); | |
990 | } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) | |
991 | cmd->targ_xfer_tag = 0xFFFFFFFF; | |
992 | cmd->cmd_sn = hdr->cmdsn; | |
993 | cmd->exp_stat_sn = hdr->exp_statsn; | |
994 | cmd->first_burst_len = payload_length; | |
995 | ||
996 | if (cmd->data_direction == DMA_FROM_DEVICE) { | |
997 | struct iscsi_datain_req *dr; | |
998 | ||
999 | dr = iscsit_allocate_datain_req(); | |
1000 | if (!dr) | |
1001 | return iscsit_add_reject_from_cmd( | |
1002 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1003 | 1, 1, buf, cmd); | |
1004 | ||
1005 | iscsit_attach_datain_req(cmd, dr); | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * The CDB is going to an se_device_t. | |
1010 | */ | |
1011 | ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb, | |
1012 | get_unaligned_le64(&hdr->lun)); | |
1013 | if (ret < 0) { | |
1014 | if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) { | |
1015 | pr_debug("Responding to non-acl'ed," | |
1016 | " non-existent or non-exported iSCSI LUN:" | |
1017 | " 0x%016Lx\n", get_unaligned_le64(&hdr->lun)); | |
1018 | } | |
1019 | if (ret == PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES) | |
1020 | return iscsit_add_reject_from_cmd( | |
1021 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1022 | 1, 1, buf, cmd); | |
1023 | ||
1024 | send_check_condition = 1; | |
1025 | goto attach_cmd; | |
1026 | } | |
1027 | /* | |
1028 | * The Initiator Node has access to the LUN (the addressing method | |
1029 | * is handled inside of iscsit_get_lun_for_cmd()). Now it's time to | |
1030 | * allocate 1->N transport tasks (depending on sector count and | |
1031 | * maximum request size the physical HBA(s) can handle. | |
1032 | */ | |
1033 | transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb); | |
1034 | if (transport_ret == -ENOMEM) { | |
1035 | return iscsit_add_reject_from_cmd( | |
1036 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1037 | 1, 1, buf, cmd); | |
1038 | } else if (transport_ret == -EINVAL) { | |
1039 | /* | |
1040 | * Unsupported SAM Opcode. CHECK_CONDITION will be sent | |
1041 | * in iscsit_execute_cmd() during the CmdSN OOO Execution | |
1042 | * Mechinism. | |
1043 | */ | |
1044 | send_check_condition = 1; | |
1045 | } else { | |
1046 | if (iscsit_decide_list_to_build(cmd, payload_length) < 0) | |
1047 | return iscsit_add_reject_from_cmd( | |
1048 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1049 | 1, 1, buf, cmd); | |
1050 | } | |
1051 | ||
1052 | attach_cmd: | |
1053 | spin_lock_bh(&conn->cmd_lock); | |
1054 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
1055 | spin_unlock_bh(&conn->cmd_lock); | |
1056 | /* | |
1057 | * Check if we need to delay processing because of ALUA | |
1058 | * Active/NonOptimized primary access state.. | |
1059 | */ | |
1060 | core_alua_check_nonop_delay(&cmd->se_cmd); | |
1061 | /* | |
1062 | * Allocate and setup SGL used with transport_generic_map_mem_to_cmd(). | |
1063 | * also call iscsit_allocate_iovecs() | |
1064 | */ | |
1065 | ret = iscsit_alloc_buffs(cmd); | |
1066 | if (ret < 0) | |
1067 | return iscsit_add_reject_from_cmd( | |
1068 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1069 | 1, 1, buf, cmd); | |
1070 | /* | |
1071 | * Check the CmdSN against ExpCmdSN/MaxCmdSN here if | |
1072 | * the Immediate Bit is not set, and no Immediate | |
1073 | * Data is attached. | |
1074 | * | |
1075 | * A PDU/CmdSN carrying Immediate Data can only | |
1076 | * be processed after the DataCRC has passed. | |
1077 | * If the DataCRC fails, the CmdSN MUST NOT | |
1078 | * be acknowledged. (See below) | |
1079 | */ | |
1080 | if (!cmd->immediate_data) { | |
1081 | cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
1082 | if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) | |
1083 | return iscsit_add_reject_from_cmd( | |
1084 | ISCSI_REASON_PROTOCOL_ERROR, | |
1085 | 1, 0, buf, cmd); | |
1086 | } | |
1087 | ||
1088 | iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); | |
1089 | ||
1090 | /* | |
1091 | * If no Immediate Data is attached, it's OK to return now. | |
1092 | */ | |
1093 | if (!cmd->immediate_data) { | |
1094 | if (send_check_condition) | |
1095 | return 0; | |
1096 | ||
1097 | if (cmd->unsolicited_data) { | |
1098 | iscsit_set_dataout_sequence_values(cmd); | |
1099 | ||
1100 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1101 | iscsit_start_dataout_timer(cmd, cmd->conn); | |
1102 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1103 | } | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * Early CHECK_CONDITIONs never make it to the transport processing | |
1110 | * thread. They are processed in CmdSN order by | |
1111 | * iscsit_check_received_cmdsn() below. | |
1112 | */ | |
1113 | if (send_check_condition) { | |
1114 | immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; | |
1115 | dump_immediate_data = 1; | |
1116 | goto after_immediate_data; | |
1117 | } | |
1118 | /* | |
1119 | * Call directly into transport_generic_new_cmd() to perform | |
1120 | * the backend memory allocation. | |
1121 | */ | |
1122 | ret = transport_generic_new_cmd(&cmd->se_cmd); | |
1123 | if ((ret < 0) || (cmd->se_cmd.se_cmd_flags & SCF_SE_CMD_FAILED)) { | |
1124 | immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; | |
1125 | dump_immediate_data = 1; | |
1126 | goto after_immediate_data; | |
1127 | } | |
1128 | ||
1129 | immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length); | |
1130 | after_immediate_data: | |
1131 | if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { | |
1132 | /* | |
1133 | * A PDU/CmdSN carrying Immediate Data passed | |
1134 | * DataCRC, check against ExpCmdSN/MaxCmdSN if | |
1135 | * Immediate Bit is not set. | |
1136 | */ | |
1137 | cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
1138 | /* | |
1139 | * Special case for Unsupported SAM WRITE Opcodes | |
1140 | * and ImmediateData=Yes. | |
1141 | */ | |
1142 | if (dump_immediate_data) { | |
1143 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
1144 | return -1; | |
1145 | } else if (cmd->unsolicited_data) { | |
1146 | iscsit_set_dataout_sequence_values(cmd); | |
1147 | ||
1148 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1149 | iscsit_start_dataout_timer(cmd, cmd->conn); | |
1150 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1151 | } | |
1152 | ||
1153 | if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) | |
1154 | return iscsit_add_reject_from_cmd( | |
1155 | ISCSI_REASON_PROTOCOL_ERROR, | |
1156 | 1, 0, buf, cmd); | |
1157 | ||
1158 | } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { | |
1159 | /* | |
1160 | * Immediate Data failed DataCRC and ERL>=1, | |
1161 | * silently drop this PDU and let the initiator | |
1162 | * plug the CmdSN gap. | |
1163 | * | |
1164 | * FIXME: Send Unsolicited NOPIN with reserved | |
1165 | * TTT here to help the initiator figure out | |
1166 | * the missing CmdSN, although they should be | |
1167 | * intelligent enough to determine the missing | |
1168 | * CmdSN and issue a retry to plug the sequence. | |
1169 | */ | |
1170 | cmd->i_state = ISTATE_REMOVE; | |
1171 | iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); | |
1172 | } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ | |
1173 | return -1; | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static u32 iscsit_do_crypto_hash_sg( | |
1179 | struct hash_desc *hash, | |
1180 | struct iscsi_cmd *cmd, | |
1181 | u32 data_offset, | |
1182 | u32 data_length, | |
1183 | u32 padding, | |
1184 | u8 *pad_bytes) | |
1185 | { | |
1186 | u32 data_crc; | |
1187 | u32 i; | |
1188 | struct scatterlist *sg; | |
1189 | unsigned int page_off; | |
1190 | ||
1191 | crypto_hash_init(hash); | |
1192 | ||
1193 | sg = cmd->first_data_sg; | |
1194 | page_off = cmd->first_data_sg_off; | |
1195 | ||
1196 | i = 0; | |
1197 | while (data_length) { | |
1198 | u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); | |
1199 | ||
1200 | crypto_hash_update(hash, &sg[i], cur_len); | |
1201 | ||
1202 | data_length -= cur_len; | |
1203 | page_off = 0; | |
1204 | i++; | |
1205 | } | |
1206 | ||
1207 | if (padding) { | |
1208 | struct scatterlist pad_sg; | |
1209 | ||
1210 | sg_init_one(&pad_sg, pad_bytes, padding); | |
1211 | crypto_hash_update(hash, &pad_sg, padding); | |
1212 | } | |
1213 | crypto_hash_final(hash, (u8 *) &data_crc); | |
1214 | ||
1215 | return data_crc; | |
1216 | } | |
1217 | ||
1218 | static void iscsit_do_crypto_hash_buf( | |
1219 | struct hash_desc *hash, | |
1220 | unsigned char *buf, | |
1221 | u32 payload_length, | |
1222 | u32 padding, | |
1223 | u8 *pad_bytes, | |
1224 | u8 *data_crc) | |
1225 | { | |
1226 | struct scatterlist sg; | |
1227 | ||
1228 | crypto_hash_init(hash); | |
1229 | ||
1230 | sg_init_one(&sg, (u8 *)buf, payload_length); | |
1231 | crypto_hash_update(hash, &sg, payload_length); | |
1232 | ||
1233 | if (padding) { | |
1234 | sg_init_one(&sg, pad_bytes, padding); | |
1235 | crypto_hash_update(hash, &sg, padding); | |
1236 | } | |
1237 | crypto_hash_final(hash, data_crc); | |
1238 | } | |
1239 | ||
1240 | static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) | |
1241 | { | |
1242 | int iov_ret, ooo_cmdsn = 0, ret; | |
1243 | u8 data_crc_failed = 0; | |
1244 | u32 checksum, iov_count = 0, padding = 0, rx_got = 0; | |
1245 | u32 rx_size = 0, payload_length; | |
1246 | struct iscsi_cmd *cmd = NULL; | |
1247 | struct se_cmd *se_cmd; | |
1248 | struct iscsi_data *hdr; | |
1249 | struct kvec *iov; | |
1250 | unsigned long flags; | |
1251 | ||
1252 | hdr = (struct iscsi_data *) buf; | |
1253 | payload_length = ntoh24(hdr->dlength); | |
1254 | hdr->itt = be32_to_cpu(hdr->itt); | |
1255 | hdr->ttt = be32_to_cpu(hdr->ttt); | |
1256 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
1257 | hdr->datasn = be32_to_cpu(hdr->datasn); | |
1258 | hdr->offset = be32_to_cpu(hdr->offset); | |
1259 | ||
1260 | if (!payload_length) { | |
1261 | pr_err("DataOUT payload is ZERO, protocol error.\n"); | |
1262 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1263 | buf, conn); | |
1264 | } | |
1265 | ||
1266 | /* iSCSI write */ | |
1267 | spin_lock_bh(&conn->sess->session_stats_lock); | |
1268 | conn->sess->rx_data_octets += payload_length; | |
1269 | if (conn->sess->se_sess->se_node_acl) { | |
1270 | spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
1271 | conn->sess->se_sess->se_node_acl->write_bytes += payload_length; | |
1272 | spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
1273 | } | |
1274 | spin_unlock_bh(&conn->sess->session_stats_lock); | |
1275 | ||
1276 | if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { | |
1277 | pr_err("DataSegmentLength: %u is greater than" | |
1278 | " MaxRecvDataSegmentLength: %u\n", payload_length, | |
1279 | conn->conn_ops->MaxRecvDataSegmentLength); | |
1280 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1281 | buf, conn); | |
1282 | } | |
1283 | ||
1284 | cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, | |
1285 | payload_length); | |
1286 | if (!cmd) | |
1287 | return 0; | |
1288 | ||
1289 | pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," | |
1290 | " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", | |
1291 | hdr->itt, hdr->ttt, hdr->datasn, hdr->offset, | |
1292 | payload_length, conn->cid); | |
1293 | ||
1294 | if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { | |
1295 | pr_err("Command ITT: 0x%08x received DataOUT after" | |
1296 | " last DataOUT received, dumping payload\n", | |
1297 | cmd->init_task_tag); | |
1298 | return iscsit_dump_data_payload(conn, payload_length, 1); | |
1299 | } | |
1300 | ||
1301 | if (cmd->data_direction != DMA_TO_DEVICE) { | |
1302 | pr_err("Command ITT: 0x%08x received DataOUT for a" | |
1303 | " NON-WRITE command.\n", cmd->init_task_tag); | |
1304 | return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, | |
1305 | 1, 0, buf, cmd); | |
1306 | } | |
1307 | se_cmd = &cmd->se_cmd; | |
1308 | iscsit_mod_dataout_timer(cmd); | |
1309 | ||
1310 | if ((hdr->offset + payload_length) > cmd->data_length) { | |
1311 | pr_err("DataOut Offset: %u, Length %u greater than" | |
1312 | " iSCSI Command EDTL %u, protocol error.\n", | |
1313 | hdr->offset, payload_length, cmd->data_length); | |
1314 | return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, | |
1315 | 1, 0, buf, cmd); | |
1316 | } | |
1317 | ||
1318 | if (cmd->unsolicited_data) { | |
1319 | int dump_unsolicited_data = 0; | |
1320 | ||
1321 | if (conn->sess->sess_ops->InitialR2T) { | |
1322 | pr_err("Received unexpected unsolicited data" | |
1323 | " while InitialR2T=Yes, protocol error.\n"); | |
1324 | transport_send_check_condition_and_sense(&cmd->se_cmd, | |
1325 | TCM_UNEXPECTED_UNSOLICITED_DATA, 0); | |
1326 | return -1; | |
1327 | } | |
1328 | /* | |
1329 | * Special case for dealing with Unsolicited DataOUT | |
1330 | * and Unsupported SAM WRITE Opcodes and SE resource allocation | |
1331 | * failures; | |
1332 | */ | |
1333 | ||
1334 | /* Something's amiss if we're not in WRITE_PENDING state... */ | |
1335 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); | |
1336 | WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); | |
1337 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); | |
1338 | ||
1339 | spin_lock_irqsave(&se_cmd->t_state_lock, flags); | |
1340 | if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) || | |
1341 | (se_cmd->se_cmd_flags & SCF_SE_CMD_FAILED)) | |
1342 | dump_unsolicited_data = 1; | |
1343 | spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); | |
1344 | ||
1345 | if (dump_unsolicited_data) { | |
1346 | /* | |
1347 | * Check if a delayed TASK_ABORTED status needs to | |
1348 | * be sent now if the ISCSI_FLAG_CMD_FINAL has been | |
1349 | * received with the unsolicitied data out. | |
1350 | */ | |
1351 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) | |
1352 | iscsit_stop_dataout_timer(cmd); | |
1353 | ||
1354 | transport_check_aborted_status(se_cmd, | |
1355 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); | |
1356 | return iscsit_dump_data_payload(conn, payload_length, 1); | |
1357 | } | |
1358 | } else { | |
1359 | /* | |
1360 | * For the normal solicited data path: | |
1361 | * | |
1362 | * Check for a delayed TASK_ABORTED status and dump any | |
1363 | * incoming data out payload if one exists. Also, when the | |
1364 | * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current | |
1365 | * data out sequence, we decrement outstanding_r2ts. Once | |
1366 | * outstanding_r2ts reaches zero, go ahead and send the delayed | |
1367 | * TASK_ABORTED status. | |
1368 | */ | |
1369 | if (atomic_read(&se_cmd->t_transport_aborted) != 0) { | |
1370 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) | |
1371 | if (--cmd->outstanding_r2ts < 1) { | |
1372 | iscsit_stop_dataout_timer(cmd); | |
1373 | transport_check_aborted_status( | |
1374 | se_cmd, 1); | |
1375 | } | |
1376 | ||
1377 | return iscsit_dump_data_payload(conn, payload_length, 1); | |
1378 | } | |
1379 | } | |
1380 | /* | |
1381 | * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and | |
1382 | * within-command recovery checks before receiving the payload. | |
1383 | */ | |
1384 | ret = iscsit_check_pre_dataout(cmd, buf); | |
1385 | if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY) | |
1386 | return 0; | |
1387 | else if (ret == DATAOUT_CANNOT_RECOVER) | |
1388 | return -1; | |
1389 | ||
1390 | rx_size += payload_length; | |
1391 | iov = &cmd->iov_data[0]; | |
1392 | ||
1393 | iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length); | |
1394 | if (iov_ret < 0) | |
1395 | return -1; | |
1396 | ||
1397 | iov_count += iov_ret; | |
1398 | ||
1399 | padding = ((-payload_length) & 3); | |
1400 | if (padding != 0) { | |
1401 | iov[iov_count].iov_base = cmd->pad_bytes; | |
1402 | iov[iov_count++].iov_len = padding; | |
1403 | rx_size += padding; | |
1404 | pr_debug("Receiving %u padding bytes.\n", padding); | |
1405 | } | |
1406 | ||
1407 | if (conn->conn_ops->DataDigest) { | |
1408 | iov[iov_count].iov_base = &checksum; | |
1409 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
1410 | rx_size += ISCSI_CRC_LEN; | |
1411 | } | |
1412 | ||
1413 | rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); | |
1414 | ||
1415 | iscsit_unmap_iovec(cmd); | |
1416 | ||
1417 | if (rx_got != rx_size) | |
1418 | return -1; | |
1419 | ||
1420 | if (conn->conn_ops->DataDigest) { | |
1421 | u32 data_crc; | |
1422 | ||
1423 | data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, | |
1424 | hdr->offset, payload_length, padding, | |
1425 | cmd->pad_bytes); | |
1426 | ||
1427 | if (checksum != data_crc) { | |
1428 | pr_err("ITT: 0x%08x, Offset: %u, Length: %u," | |
1429 | " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" | |
1430 | " does not match computed 0x%08x\n", | |
1431 | hdr->itt, hdr->offset, payload_length, | |
1432 | hdr->datasn, checksum, data_crc); | |
1433 | data_crc_failed = 1; | |
1434 | } else { | |
1435 | pr_debug("Got CRC32C DataDigest 0x%08x for" | |
1436 | " %u bytes of Data Out\n", checksum, | |
1437 | payload_length); | |
1438 | } | |
1439 | } | |
1440 | /* | |
1441 | * Increment post receive data and CRC values or perform | |
1442 | * within-command recovery. | |
1443 | */ | |
1444 | ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed); | |
1445 | if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)) | |
1446 | return 0; | |
1447 | else if (ret == DATAOUT_SEND_R2T) { | |
1448 | iscsit_set_dataout_sequence_values(cmd); | |
1449 | iscsit_build_r2ts_for_cmd(cmd, conn, 0); | |
1450 | } else if (ret == DATAOUT_SEND_TO_TRANSPORT) { | |
1451 | /* | |
1452 | * Handle extra special case for out of order | |
1453 | * Unsolicited Data Out. | |
1454 | */ | |
1455 | spin_lock_bh(&cmd->istate_lock); | |
1456 | ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); | |
1457 | cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; | |
1458 | cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; | |
1459 | spin_unlock_bh(&cmd->istate_lock); | |
1460 | ||
1461 | iscsit_stop_dataout_timer(cmd); | |
1462 | return (!ooo_cmdsn) ? transport_generic_handle_data( | |
1463 | &cmd->se_cmd) : 0; | |
1464 | } else /* DATAOUT_CANNOT_RECOVER */ | |
1465 | return -1; | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | static int iscsit_handle_nop_out( | |
1471 | struct iscsi_conn *conn, | |
1472 | unsigned char *buf) | |
1473 | { | |
1474 | unsigned char *ping_data = NULL; | |
1475 | int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size; | |
1476 | u32 checksum, data_crc, padding = 0, payload_length; | |
1477 | u64 lun; | |
1478 | struct iscsi_cmd *cmd = NULL; | |
1479 | struct kvec *iov = NULL; | |
1480 | struct iscsi_nopout *hdr; | |
1481 | ||
1482 | hdr = (struct iscsi_nopout *) buf; | |
1483 | payload_length = ntoh24(hdr->dlength); | |
1484 | lun = get_unaligned_le64(&hdr->lun); | |
1485 | hdr->itt = be32_to_cpu(hdr->itt); | |
1486 | hdr->ttt = be32_to_cpu(hdr->ttt); | |
1487 | hdr->cmdsn = be32_to_cpu(hdr->cmdsn); | |
1488 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
1489 | ||
1490 | if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
1491 | pr_err("NOPOUT ITT is reserved, but Immediate Bit is" | |
1492 | " not set, protocol error.\n"); | |
1493 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1494 | buf, conn); | |
1495 | } | |
1496 | ||
1497 | if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { | |
1498 | pr_err("NOPOUT Ping Data DataSegmentLength: %u is" | |
1499 | " greater than MaxRecvDataSegmentLength: %u, protocol" | |
1500 | " error.\n", payload_length, | |
1501 | conn->conn_ops->MaxRecvDataSegmentLength); | |
1502 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1503 | buf, conn); | |
1504 | } | |
1505 | ||
1506 | pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x," | |
1507 | " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", | |
1508 | (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request", | |
1509 | hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, | |
1510 | payload_length); | |
1511 | /* | |
1512 | * This is not a response to a Unsolicited NopIN, which means | |
1513 | * it can either be a NOPOUT ping request (with a valid ITT), | |
1514 | * or a NOPOUT not requesting a NOPIN (with a reserved ITT). | |
1515 | * Either way, make sure we allocate an struct iscsi_cmd, as both | |
1516 | * can contain ping data. | |
1517 | */ | |
1518 | if (hdr->ttt == 0xFFFFFFFF) { | |
1519 | cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); | |
1520 | if (!cmd) | |
1521 | return iscsit_add_reject( | |
1522 | ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1523 | 1, buf, conn); | |
1524 | ||
1525 | cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; | |
1526 | cmd->i_state = ISTATE_SEND_NOPIN; | |
1527 | cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? | |
1528 | 1 : 0); | |
1529 | conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; | |
1530 | cmd->targ_xfer_tag = 0xFFFFFFFF; | |
1531 | cmd->cmd_sn = hdr->cmdsn; | |
1532 | cmd->exp_stat_sn = hdr->exp_statsn; | |
1533 | cmd->data_direction = DMA_NONE; | |
1534 | } | |
1535 | ||
1536 | if (payload_length && (hdr->ttt == 0xFFFFFFFF)) { | |
1537 | rx_size = payload_length; | |
1538 | ping_data = kzalloc(payload_length + 1, GFP_KERNEL); | |
1539 | if (!ping_data) { | |
1540 | pr_err("Unable to allocate memory for" | |
1541 | " NOPOUT ping data.\n"); | |
1542 | ret = -1; | |
1543 | goto out; | |
1544 | } | |
1545 | ||
1546 | iov = &cmd->iov_misc[0]; | |
1547 | iov[niov].iov_base = ping_data; | |
1548 | iov[niov++].iov_len = payload_length; | |
1549 | ||
1550 | padding = ((-payload_length) & 3); | |
1551 | if (padding != 0) { | |
1552 | pr_debug("Receiving %u additional bytes" | |
1553 | " for padding.\n", padding); | |
1554 | iov[niov].iov_base = &cmd->pad_bytes; | |
1555 | iov[niov++].iov_len = padding; | |
1556 | rx_size += padding; | |
1557 | } | |
1558 | if (conn->conn_ops->DataDigest) { | |
1559 | iov[niov].iov_base = &checksum; | |
1560 | iov[niov++].iov_len = ISCSI_CRC_LEN; | |
1561 | rx_size += ISCSI_CRC_LEN; | |
1562 | } | |
1563 | ||
1564 | rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); | |
1565 | if (rx_got != rx_size) { | |
1566 | ret = -1; | |
1567 | goto out; | |
1568 | } | |
1569 | ||
1570 | if (conn->conn_ops->DataDigest) { | |
1571 | iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, | |
1572 | ping_data, payload_length, | |
1573 | padding, cmd->pad_bytes, | |
1574 | (u8 *)&data_crc); | |
1575 | ||
1576 | if (checksum != data_crc) { | |
1577 | pr_err("Ping data CRC32C DataDigest" | |
1578 | " 0x%08x does not match computed 0x%08x\n", | |
1579 | checksum, data_crc); | |
1580 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
1581 | pr_err("Unable to recover from" | |
1582 | " NOPOUT Ping DataCRC failure while in" | |
1583 | " ERL=0.\n"); | |
1584 | ret = -1; | |
1585 | goto out; | |
1586 | } else { | |
1587 | /* | |
1588 | * Silently drop this PDU and let the | |
1589 | * initiator plug the CmdSN gap. | |
1590 | */ | |
1591 | pr_debug("Dropping NOPOUT" | |
1592 | " Command CmdSN: 0x%08x due to" | |
1593 | " DataCRC error.\n", hdr->cmdsn); | |
1594 | ret = 0; | |
1595 | goto out; | |
1596 | } | |
1597 | } else { | |
1598 | pr_debug("Got CRC32C DataDigest" | |
1599 | " 0x%08x for %u bytes of ping data.\n", | |
1600 | checksum, payload_length); | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | ping_data[payload_length] = '\0'; | |
1605 | /* | |
1606 | * Attach ping data to struct iscsi_cmd->buf_ptr. | |
1607 | */ | |
1608 | cmd->buf_ptr = (void *)ping_data; | |
1609 | cmd->buf_ptr_size = payload_length; | |
1610 | ||
1611 | pr_debug("Got %u bytes of NOPOUT ping" | |
1612 | " data.\n", payload_length); | |
1613 | pr_debug("Ping Data: \"%s\"\n", ping_data); | |
1614 | } | |
1615 | ||
1616 | if (hdr->itt != 0xFFFFFFFF) { | |
1617 | if (!cmd) { | |
1618 | pr_err("Checking CmdSN for NOPOUT," | |
1619 | " but cmd is NULL!\n"); | |
1620 | return -1; | |
1621 | } | |
1622 | /* | |
1623 | * Initiator is expecting a NopIN ping reply, | |
1624 | */ | |
1625 | spin_lock_bh(&conn->cmd_lock); | |
1626 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
1627 | spin_unlock_bh(&conn->cmd_lock); | |
1628 | ||
1629 | iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); | |
1630 | ||
1631 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) { | |
1632 | iscsit_add_cmd_to_response_queue(cmd, conn, | |
1633 | cmd->i_state); | |
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
1638 | if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { | |
1639 | ret = 0; | |
1640 | goto ping_out; | |
1641 | } | |
1642 | if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) | |
1643 | return iscsit_add_reject_from_cmd( | |
1644 | ISCSI_REASON_PROTOCOL_ERROR, | |
1645 | 1, 0, buf, cmd); | |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | ||
1650 | if (hdr->ttt != 0xFFFFFFFF) { | |
1651 | /* | |
1652 | * This was a response to a unsolicited NOPIN ping. | |
1653 | */ | |
1654 | cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt); | |
1655 | if (!cmd) | |
1656 | return -1; | |
1657 | ||
1658 | iscsit_stop_nopin_response_timer(conn); | |
1659 | ||
1660 | cmd->i_state = ISTATE_REMOVE; | |
1661 | iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); | |
1662 | iscsit_start_nopin_timer(conn); | |
1663 | } else { | |
1664 | /* | |
1665 | * Initiator is not expecting a NOPIN is response. | |
1666 | * Just ignore for now. | |
1667 | * | |
1668 | * iSCSI v19-91 10.18 | |
1669 | * "A NOP-OUT may also be used to confirm a changed | |
1670 | * ExpStatSN if another PDU will not be available | |
1671 | * for a long time." | |
1672 | */ | |
1673 | ret = 0; | |
1674 | goto out; | |
1675 | } | |
1676 | ||
1677 | return 0; | |
1678 | out: | |
1679 | if (cmd) | |
1680 | iscsit_release_cmd(cmd); | |
1681 | ping_out: | |
1682 | kfree(ping_data); | |
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | static int iscsit_handle_task_mgt_cmd( | |
1687 | struct iscsi_conn *conn, | |
1688 | unsigned char *buf) | |
1689 | { | |
1690 | struct iscsi_cmd *cmd; | |
1691 | struct se_tmr_req *se_tmr; | |
1692 | struct iscsi_tmr_req *tmr_req; | |
1693 | struct iscsi_tm *hdr; | |
1694 | u32 payload_length; | |
1695 | int out_of_order_cmdsn = 0; | |
1696 | int ret; | |
1697 | u8 function; | |
1698 | ||
1699 | hdr = (struct iscsi_tm *) buf; | |
1700 | payload_length = ntoh24(hdr->dlength); | |
1701 | hdr->itt = be32_to_cpu(hdr->itt); | |
1702 | hdr->rtt = be32_to_cpu(hdr->rtt); | |
1703 | hdr->cmdsn = be32_to_cpu(hdr->cmdsn); | |
1704 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
1705 | hdr->refcmdsn = be32_to_cpu(hdr->refcmdsn); | |
1706 | hdr->exp_datasn = be32_to_cpu(hdr->exp_datasn); | |
1707 | hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; | |
1708 | function = hdr->flags; | |
1709 | ||
1710 | pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" | |
1711 | " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" | |
1712 | " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, | |
1713 | hdr->rtt, hdr->refcmdsn, conn->cid); | |
1714 | ||
1715 | if ((function != ISCSI_TM_FUNC_ABORT_TASK) && | |
1716 | ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && | |
1717 | (hdr->rtt != ISCSI_RESERVED_TAG))) { | |
1718 | pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); | |
1719 | hdr->rtt = ISCSI_RESERVED_TAG; | |
1720 | } | |
1721 | ||
1722 | if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && | |
1723 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
1724 | pr_err("Task Management Request TASK_REASSIGN not" | |
1725 | " issued as immediate command, bad iSCSI Initiator" | |
1726 | "implementation\n"); | |
1727 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1728 | buf, conn); | |
1729 | } | |
1730 | if ((function != ISCSI_TM_FUNC_ABORT_TASK) && | |
1731 | (hdr->refcmdsn != ISCSI_RESERVED_TAG)) | |
1732 | hdr->refcmdsn = ISCSI_RESERVED_TAG; | |
1733 | ||
1734 | cmd = iscsit_allocate_se_cmd_for_tmr(conn, function); | |
1735 | if (!cmd) | |
1736 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1737 | 1, buf, conn); | |
1738 | ||
1739 | cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; | |
1740 | cmd->i_state = ISTATE_SEND_TASKMGTRSP; | |
1741 | cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); | |
1742 | cmd->init_task_tag = hdr->itt; | |
1743 | cmd->targ_xfer_tag = 0xFFFFFFFF; | |
1744 | cmd->cmd_sn = hdr->cmdsn; | |
1745 | cmd->exp_stat_sn = hdr->exp_statsn; | |
1746 | se_tmr = cmd->se_cmd.se_tmr_req; | |
1747 | tmr_req = cmd->tmr_req; | |
1748 | /* | |
1749 | * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN | |
1750 | */ | |
1751 | if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { | |
1752 | ret = iscsit_get_lun_for_tmr(cmd, | |
1753 | get_unaligned_le64(&hdr->lun)); | |
1754 | if (ret < 0) { | |
1755 | cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1756 | se_tmr->response = ISCSI_TMF_RSP_NO_LUN; | |
1757 | goto attach; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | switch (function) { | |
1762 | case ISCSI_TM_FUNC_ABORT_TASK: | |
1763 | se_tmr->response = iscsit_tmr_abort_task(cmd, buf); | |
1764 | if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) { | |
1765 | cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1766 | goto attach; | |
1767 | } | |
1768 | break; | |
1769 | case ISCSI_TM_FUNC_ABORT_TASK_SET: | |
1770 | case ISCSI_TM_FUNC_CLEAR_ACA: | |
1771 | case ISCSI_TM_FUNC_CLEAR_TASK_SET: | |
1772 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
1773 | break; | |
1774 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
1775 | if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { | |
1776 | cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1777 | se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; | |
1778 | goto attach; | |
1779 | } | |
1780 | break; | |
1781 | case ISCSI_TM_FUNC_TARGET_COLD_RESET: | |
1782 | if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { | |
1783 | cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1784 | se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; | |
1785 | goto attach; | |
1786 | } | |
1787 | break; | |
1788 | case ISCSI_TM_FUNC_TASK_REASSIGN: | |
1789 | se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); | |
1790 | /* | |
1791 | * Perform sanity checks on the ExpDataSN only if the | |
1792 | * TASK_REASSIGN was successful. | |
1793 | */ | |
1794 | if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) | |
1795 | break; | |
1796 | ||
1797 | if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) | |
1798 | return iscsit_add_reject_from_cmd( | |
1799 | ISCSI_REASON_BOOKMARK_INVALID, 1, 1, | |
1800 | buf, cmd); | |
1801 | break; | |
1802 | default: | |
1803 | pr_err("Unknown TMR function: 0x%02x, protocol" | |
1804 | " error.\n", function); | |
1805 | cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; | |
1806 | se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; | |
1807 | goto attach; | |
1808 | } | |
1809 | ||
1810 | if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && | |
1811 | (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) | |
1812 | se_tmr->call_transport = 1; | |
1813 | attach: | |
1814 | spin_lock_bh(&conn->cmd_lock); | |
1815 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
1816 | spin_unlock_bh(&conn->cmd_lock); | |
1817 | ||
1818 | if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
1819 | int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
1820 | if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) | |
1821 | out_of_order_cmdsn = 1; | |
1822 | else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { | |
1823 | return 0; | |
1824 | } else { /* (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) */ | |
1825 | return iscsit_add_reject_from_cmd( | |
1826 | ISCSI_REASON_PROTOCOL_ERROR, | |
1827 | 1, 0, buf, cmd); | |
1828 | } | |
1829 | } | |
1830 | iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); | |
1831 | ||
1832 | if (out_of_order_cmdsn) | |
1833 | return 0; | |
1834 | /* | |
1835 | * Found the referenced task, send to transport for processing. | |
1836 | */ | |
1837 | if (se_tmr->call_transport) | |
1838 | return transport_generic_handle_tmr(&cmd->se_cmd); | |
1839 | ||
1840 | /* | |
1841 | * Could not find the referenced LUN, task, or Task Management | |
1842 | * command not authorized or supported. Change state and | |
1843 | * let the tx_thread send the response. | |
1844 | * | |
1845 | * For connection recovery, this is also the default action for | |
1846 | * TMR TASK_REASSIGN. | |
1847 | */ | |
1848 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
1849 | return 0; | |
1850 | } | |
1851 | ||
1852 | /* #warning FIXME: Support Text Command parameters besides SendTargets */ | |
1853 | static int iscsit_handle_text_cmd( | |
1854 | struct iscsi_conn *conn, | |
1855 | unsigned char *buf) | |
1856 | { | |
1857 | char *text_ptr, *text_in; | |
1858 | int cmdsn_ret, niov = 0, rx_got, rx_size; | |
1859 | u32 checksum = 0, data_crc = 0, payload_length; | |
76f1928e | 1860 | u32 padding = 0, pad_bytes = 0, text_length = 0; |
e48354ce NB |
1861 | struct iscsi_cmd *cmd; |
1862 | struct kvec iov[3]; | |
1863 | struct iscsi_text *hdr; | |
1864 | ||
1865 | hdr = (struct iscsi_text *) buf; | |
1866 | payload_length = ntoh24(hdr->dlength); | |
1867 | hdr->itt = be32_to_cpu(hdr->itt); | |
1868 | hdr->ttt = be32_to_cpu(hdr->ttt); | |
1869 | hdr->cmdsn = be32_to_cpu(hdr->cmdsn); | |
1870 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
1871 | ||
1872 | if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) { | |
1873 | pr_err("Unable to accept text parameter length: %u" | |
1874 | "greater than MaxRecvDataSegmentLength %u.\n", | |
1875 | payload_length, conn->conn_ops->MaxRecvDataSegmentLength); | |
1876 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
1877 | buf, conn); | |
1878 | } | |
1879 | ||
1880 | pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," | |
1881 | " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, | |
1882 | hdr->exp_statsn, payload_length); | |
1883 | ||
1884 | rx_size = text_length = payload_length; | |
1885 | if (text_length) { | |
1886 | text_in = kzalloc(text_length, GFP_KERNEL); | |
1887 | if (!text_in) { | |
1888 | pr_err("Unable to allocate memory for" | |
1889 | " incoming text parameters\n"); | |
1890 | return -1; | |
1891 | } | |
1892 | ||
1893 | memset(iov, 0, 3 * sizeof(struct kvec)); | |
1894 | iov[niov].iov_base = text_in; | |
1895 | iov[niov++].iov_len = text_length; | |
1896 | ||
1897 | padding = ((-payload_length) & 3); | |
1898 | if (padding != 0) { | |
76f1928e | 1899 | iov[niov].iov_base = &pad_bytes; |
e48354ce NB |
1900 | iov[niov++].iov_len = padding; |
1901 | rx_size += padding; | |
1902 | pr_debug("Receiving %u additional bytes" | |
1903 | " for padding.\n", padding); | |
1904 | } | |
1905 | if (conn->conn_ops->DataDigest) { | |
1906 | iov[niov].iov_base = &checksum; | |
1907 | iov[niov++].iov_len = ISCSI_CRC_LEN; | |
1908 | rx_size += ISCSI_CRC_LEN; | |
1909 | } | |
1910 | ||
1911 | rx_got = rx_data(conn, &iov[0], niov, rx_size); | |
1912 | if (rx_got != rx_size) { | |
1913 | kfree(text_in); | |
1914 | return -1; | |
1915 | } | |
1916 | ||
1917 | if (conn->conn_ops->DataDigest) { | |
1918 | iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, | |
1919 | text_in, text_length, | |
76f1928e | 1920 | padding, (u8 *)&pad_bytes, |
e48354ce NB |
1921 | (u8 *)&data_crc); |
1922 | ||
1923 | if (checksum != data_crc) { | |
1924 | pr_err("Text data CRC32C DataDigest" | |
1925 | " 0x%08x does not match computed" | |
1926 | " 0x%08x\n", checksum, data_crc); | |
1927 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
1928 | pr_err("Unable to recover from" | |
1929 | " Text Data digest failure while in" | |
1930 | " ERL=0.\n"); | |
1931 | kfree(text_in); | |
1932 | return -1; | |
1933 | } else { | |
1934 | /* | |
1935 | * Silently drop this PDU and let the | |
1936 | * initiator plug the CmdSN gap. | |
1937 | */ | |
1938 | pr_debug("Dropping Text" | |
1939 | " Command CmdSN: 0x%08x due to" | |
1940 | " DataCRC error.\n", hdr->cmdsn); | |
1941 | kfree(text_in); | |
1942 | return 0; | |
1943 | } | |
1944 | } else { | |
1945 | pr_debug("Got CRC32C DataDigest" | |
1946 | " 0x%08x for %u bytes of text data.\n", | |
1947 | checksum, text_length); | |
1948 | } | |
1949 | } | |
1950 | text_in[text_length - 1] = '\0'; | |
1951 | pr_debug("Successfully read %d bytes of text" | |
1952 | " data.\n", text_length); | |
1953 | ||
1954 | if (strncmp("SendTargets", text_in, 11) != 0) { | |
1955 | pr_err("Received Text Data that is not" | |
1956 | " SendTargets, cannot continue.\n"); | |
1957 | kfree(text_in); | |
1958 | return -1; | |
1959 | } | |
1960 | text_ptr = strchr(text_in, '='); | |
1961 | if (!text_ptr) { | |
1962 | pr_err("No \"=\" separator found in Text Data," | |
1963 | " cannot continue.\n"); | |
1964 | kfree(text_in); | |
1965 | return -1; | |
1966 | } | |
1967 | if (strncmp("=All", text_ptr, 4) != 0) { | |
1968 | pr_err("Unable to locate All value for" | |
1969 | " SendTargets key, cannot continue.\n"); | |
1970 | kfree(text_in); | |
1971 | return -1; | |
1972 | } | |
1973 | /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */ | |
1974 | kfree(text_in); | |
1975 | } | |
1976 | ||
1977 | cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); | |
1978 | if (!cmd) | |
1979 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
1980 | 1, buf, conn); | |
1981 | ||
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 = hdr->cmdsn; | |
1988 | cmd->exp_stat_sn = hdr->exp_statsn; | |
1989 | cmd->data_direction = DMA_NONE; | |
1990 | ||
1991 | spin_lock_bh(&conn->cmd_lock); | |
1992 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
1993 | spin_unlock_bh(&conn->cmd_lock); | |
1994 | ||
1995 | iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); | |
1996 | ||
1997 | if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
1998 | cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
1999 | if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) | |
2000 | return iscsit_add_reject_from_cmd( | |
2001 | ISCSI_REASON_PROTOCOL_ERROR, | |
2002 | 1, 0, buf, cmd); | |
2003 | ||
2004 | return 0; | |
2005 | } | |
2006 | ||
2007 | return iscsit_execute_cmd(cmd, 0); | |
2008 | } | |
2009 | ||
2010 | int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) | |
2011 | { | |
2012 | struct iscsi_conn *conn_p; | |
2013 | struct iscsi_session *sess = conn->sess; | |
2014 | ||
2015 | pr_debug("Received logout request CLOSESESSION on CID: %hu" | |
2016 | " for SID: %u.\n", conn->cid, conn->sess->sid); | |
2017 | ||
2018 | atomic_set(&sess->session_logout, 1); | |
2019 | atomic_set(&conn->conn_logout_remove, 1); | |
2020 | conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; | |
2021 | ||
2022 | iscsit_inc_conn_usage_count(conn); | |
2023 | iscsit_inc_session_usage_count(sess); | |
2024 | ||
2025 | spin_lock_bh(&sess->conn_lock); | |
2026 | list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { | |
2027 | if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) | |
2028 | continue; | |
2029 | ||
2030 | pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); | |
2031 | conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; | |
2032 | } | |
2033 | spin_unlock_bh(&sess->conn_lock); | |
2034 | ||
2035 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
2036 | ||
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) | |
2041 | { | |
2042 | struct iscsi_conn *l_conn; | |
2043 | struct iscsi_session *sess = conn->sess; | |
2044 | ||
2045 | pr_debug("Received logout request CLOSECONNECTION for CID:" | |
2046 | " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); | |
2047 | ||
2048 | /* | |
2049 | * A Logout Request with a CLOSECONNECTION reason code for a CID | |
2050 | * can arrive on a connection with a differing CID. | |
2051 | */ | |
2052 | if (conn->cid == cmd->logout_cid) { | |
2053 | spin_lock_bh(&conn->state_lock); | |
2054 | pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); | |
2055 | conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; | |
2056 | ||
2057 | atomic_set(&conn->conn_logout_remove, 1); | |
2058 | conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; | |
2059 | iscsit_inc_conn_usage_count(conn); | |
2060 | ||
2061 | spin_unlock_bh(&conn->state_lock); | |
2062 | } else { | |
2063 | /* | |
2064 | * Handle all different cid CLOSECONNECTION requests in | |
2065 | * iscsit_logout_post_handler_diffcid() as to give enough | |
2066 | * time for any non immediate command's CmdSN to be | |
2067 | * acknowledged on the connection in question. | |
2068 | * | |
2069 | * Here we simply make sure the CID is still around. | |
2070 | */ | |
2071 | l_conn = iscsit_get_conn_from_cid(sess, | |
2072 | cmd->logout_cid); | |
2073 | if (!l_conn) { | |
2074 | cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; | |
2075 | iscsit_add_cmd_to_response_queue(cmd, conn, | |
2076 | cmd->i_state); | |
2077 | return 0; | |
2078 | } | |
2079 | ||
2080 | iscsit_dec_conn_usage_count(l_conn); | |
2081 | } | |
2082 | ||
2083 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
2084 | ||
2085 | return 0; | |
2086 | } | |
2087 | ||
2088 | int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) | |
2089 | { | |
2090 | struct iscsi_session *sess = conn->sess; | |
2091 | ||
2092 | pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" | |
2093 | " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); | |
2094 | ||
2095 | if (sess->sess_ops->ErrorRecoveryLevel != 2) { | |
2096 | pr_err("Received Logout Request REMOVECONNFORRECOVERY" | |
2097 | " while ERL!=2.\n"); | |
2098 | cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; | |
2099 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
2100 | return 0; | |
2101 | } | |
2102 | ||
2103 | if (conn->cid == cmd->logout_cid) { | |
2104 | pr_err("Received Logout Request REMOVECONNFORRECOVERY" | |
2105 | " with CID: %hu on CID: %hu, implementation error.\n", | |
2106 | cmd->logout_cid, conn->cid); | |
2107 | cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; | |
2108 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
2109 | return 0; | |
2110 | } | |
2111 | ||
2112 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
2113 | ||
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | static int iscsit_handle_logout_cmd( | |
2118 | struct iscsi_conn *conn, | |
2119 | unsigned char *buf) | |
2120 | { | |
2121 | int cmdsn_ret, logout_remove = 0; | |
2122 | u8 reason_code = 0; | |
2123 | struct iscsi_cmd *cmd; | |
2124 | struct iscsi_logout *hdr; | |
2125 | struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); | |
2126 | ||
2127 | hdr = (struct iscsi_logout *) buf; | |
2128 | reason_code = (hdr->flags & 0x7f); | |
2129 | hdr->itt = be32_to_cpu(hdr->itt); | |
2130 | hdr->cid = be16_to_cpu(hdr->cid); | |
2131 | hdr->cmdsn = be32_to_cpu(hdr->cmdsn); | |
2132 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
2133 | ||
2134 | if (tiqn) { | |
2135 | spin_lock(&tiqn->logout_stats.lock); | |
2136 | if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) | |
2137 | tiqn->logout_stats.normal_logouts++; | |
2138 | else | |
2139 | tiqn->logout_stats.abnormal_logouts++; | |
2140 | spin_unlock(&tiqn->logout_stats.lock); | |
2141 | } | |
2142 | ||
2143 | pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" | |
2144 | " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", | |
2145 | hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, | |
2146 | hdr->cid, conn->cid); | |
2147 | ||
2148 | if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { | |
2149 | pr_err("Received logout request on connection that" | |
2150 | " is not in logged in state, ignoring request.\n"); | |
2151 | return 0; | |
2152 | } | |
2153 | ||
2154 | cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); | |
2155 | if (!cmd) | |
2156 | return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, | |
2157 | buf, conn); | |
2158 | ||
2159 | cmd->iscsi_opcode = ISCSI_OP_LOGOUT; | |
2160 | cmd->i_state = ISTATE_SEND_LOGOUTRSP; | |
2161 | cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); | |
2162 | conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; | |
2163 | cmd->targ_xfer_tag = 0xFFFFFFFF; | |
2164 | cmd->cmd_sn = hdr->cmdsn; | |
2165 | cmd->exp_stat_sn = hdr->exp_statsn; | |
2166 | cmd->logout_cid = hdr->cid; | |
2167 | cmd->logout_reason = reason_code; | |
2168 | cmd->data_direction = DMA_NONE; | |
2169 | ||
2170 | /* | |
2171 | * We need to sleep in these cases (by returning 1) until the Logout | |
2172 | * Response gets sent in the tx thread. | |
2173 | */ | |
2174 | if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || | |
2175 | ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && | |
2176 | (hdr->cid == conn->cid))) | |
2177 | logout_remove = 1; | |
2178 | ||
2179 | spin_lock_bh(&conn->cmd_lock); | |
2180 | list_add_tail(&cmd->i_list, &conn->conn_cmd_list); | |
2181 | spin_unlock_bh(&conn->cmd_lock); | |
2182 | ||
2183 | if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) | |
2184 | iscsit_ack_from_expstatsn(conn, hdr->exp_statsn); | |
2185 | ||
2186 | /* | |
2187 | * Immediate commands are executed, well, immediately. | |
2188 | * Non-Immediate Logout Commands are executed in CmdSN order. | |
2189 | */ | |
2190 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) { | |
2191 | int ret = iscsit_execute_cmd(cmd, 0); | |
2192 | ||
2193 | if (ret < 0) | |
2194 | return ret; | |
2195 | } else { | |
2196 | cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); | |
2197 | if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { | |
2198 | logout_remove = 0; | |
2199 | } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { | |
2200 | return iscsit_add_reject_from_cmd( | |
2201 | ISCSI_REASON_PROTOCOL_ERROR, | |
2202 | 1, 0, buf, cmd); | |
2203 | } | |
2204 | } | |
2205 | ||
2206 | return logout_remove; | |
2207 | } | |
2208 | ||
2209 | static int iscsit_handle_snack( | |
2210 | struct iscsi_conn *conn, | |
2211 | unsigned char *buf) | |
2212 | { | |
2213 | u32 unpacked_lun; | |
2214 | u64 lun; | |
2215 | struct iscsi_snack *hdr; | |
2216 | ||
2217 | hdr = (struct iscsi_snack *) buf; | |
2218 | hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; | |
2219 | lun = get_unaligned_le64(&hdr->lun); | |
2220 | unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun); | |
2221 | hdr->itt = be32_to_cpu(hdr->itt); | |
2222 | hdr->ttt = be32_to_cpu(hdr->ttt); | |
2223 | hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn); | |
2224 | hdr->begrun = be32_to_cpu(hdr->begrun); | |
2225 | hdr->runlength = be32_to_cpu(hdr->runlength); | |
2226 | ||
2227 | pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" | |
2228 | " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," | |
2229 | " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, | |
2230 | hdr->begrun, hdr->runlength, conn->cid); | |
2231 | ||
2232 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
2233 | pr_err("Initiator sent SNACK request while in" | |
2234 | " ErrorRecoveryLevel=0.\n"); | |
2235 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
2236 | buf, conn); | |
2237 | } | |
2238 | /* | |
2239 | * SNACK_DATA and SNACK_R2T are both 0, so check which function to | |
2240 | * call from inside iscsi_send_recovery_datain_or_r2t(). | |
2241 | */ | |
2242 | switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { | |
2243 | case 0: | |
2244 | return iscsit_handle_recovery_datain_or_r2t(conn, buf, | |
2245 | hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength); | |
2246 | return 0; | |
2247 | case ISCSI_FLAG_SNACK_TYPE_STATUS: | |
2248 | return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt, | |
2249 | hdr->begrun, hdr->runlength); | |
2250 | case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: | |
2251 | return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun, | |
2252 | hdr->runlength); | |
2253 | case ISCSI_FLAG_SNACK_TYPE_RDATA: | |
2254 | /* FIXME: Support R-Data SNACK */ | |
2255 | pr_err("R-Data SNACK Not Supported.\n"); | |
2256 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
2257 | buf, conn); | |
2258 | default: | |
2259 | pr_err("Unknown SNACK type 0x%02x, protocol" | |
2260 | " error.\n", hdr->flags & 0x0f); | |
2261 | return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
2262 | buf, conn); | |
2263 | } | |
2264 | ||
2265 | return 0; | |
2266 | } | |
2267 | ||
2268 | static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) | |
2269 | { | |
2270 | if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || | |
2271 | (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { | |
2272 | wait_for_completion_interruptible_timeout( | |
2273 | &conn->rx_half_close_comp, | |
2274 | ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | static int iscsit_handle_immediate_data( | |
2279 | struct iscsi_cmd *cmd, | |
2280 | unsigned char *buf, | |
2281 | u32 length) | |
2282 | { | |
2283 | int iov_ret, rx_got = 0, rx_size = 0; | |
2284 | u32 checksum, iov_count = 0, padding = 0; | |
2285 | struct iscsi_conn *conn = cmd->conn; | |
2286 | struct kvec *iov; | |
2287 | ||
2288 | iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); | |
2289 | if (iov_ret < 0) | |
2290 | return IMMEDIATE_DATA_CANNOT_RECOVER; | |
2291 | ||
2292 | rx_size = length; | |
2293 | iov_count = iov_ret; | |
2294 | iov = &cmd->iov_data[0]; | |
2295 | ||
2296 | padding = ((-length) & 3); | |
2297 | if (padding != 0) { | |
2298 | iov[iov_count].iov_base = cmd->pad_bytes; | |
2299 | iov[iov_count++].iov_len = padding; | |
2300 | rx_size += padding; | |
2301 | } | |
2302 | ||
2303 | if (conn->conn_ops->DataDigest) { | |
2304 | iov[iov_count].iov_base = &checksum; | |
2305 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
2306 | rx_size += ISCSI_CRC_LEN; | |
2307 | } | |
2308 | ||
2309 | rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); | |
2310 | ||
2311 | iscsit_unmap_iovec(cmd); | |
2312 | ||
2313 | if (rx_got != rx_size) { | |
2314 | iscsit_rx_thread_wait_for_tcp(conn); | |
2315 | return IMMEDIATE_DATA_CANNOT_RECOVER; | |
2316 | } | |
2317 | ||
2318 | if (conn->conn_ops->DataDigest) { | |
2319 | u32 data_crc; | |
2320 | ||
2321 | data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, | |
2322 | cmd->write_data_done, length, padding, | |
2323 | cmd->pad_bytes); | |
2324 | ||
2325 | if (checksum != data_crc) { | |
2326 | pr_err("ImmediateData CRC32C DataDigest 0x%08x" | |
2327 | " does not match computed 0x%08x\n", checksum, | |
2328 | data_crc); | |
2329 | ||
2330 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
2331 | pr_err("Unable to recover from" | |
2332 | " Immediate Data digest failure while" | |
2333 | " in ERL=0.\n"); | |
2334 | iscsit_add_reject_from_cmd( | |
2335 | ISCSI_REASON_DATA_DIGEST_ERROR, | |
2336 | 1, 0, buf, cmd); | |
2337 | return IMMEDIATE_DATA_CANNOT_RECOVER; | |
2338 | } else { | |
2339 | iscsit_add_reject_from_cmd( | |
2340 | ISCSI_REASON_DATA_DIGEST_ERROR, | |
2341 | 0, 0, buf, cmd); | |
2342 | return IMMEDIATE_DATA_ERL1_CRC_FAILURE; | |
2343 | } | |
2344 | } else { | |
2345 | pr_debug("Got CRC32C DataDigest 0x%08x for" | |
2346 | " %u bytes of Immediate Data\n", checksum, | |
2347 | length); | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | cmd->write_data_done += length; | |
2352 | ||
2353 | if (cmd->write_data_done == cmd->data_length) { | |
2354 | spin_lock_bh(&cmd->istate_lock); | |
2355 | cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; | |
2356 | cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; | |
2357 | spin_unlock_bh(&cmd->istate_lock); | |
2358 | } | |
2359 | ||
2360 | return IMMEDIATE_DATA_NORMAL_OPERATION; | |
2361 | } | |
2362 | ||
2363 | /* | |
2364 | * Called with sess->conn_lock held. | |
2365 | */ | |
2366 | /* #warning iscsi_build_conn_drop_async_message() only sends out on connections | |
2367 | with active network interface */ | |
2368 | static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) | |
2369 | { | |
2370 | struct iscsi_cmd *cmd; | |
2371 | struct iscsi_conn *conn_p; | |
2372 | ||
2373 | /* | |
2374 | * Only send a Asynchronous Message on connections whos network | |
2375 | * interface is still functional. | |
2376 | */ | |
2377 | list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { | |
2378 | if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { | |
2379 | iscsit_inc_conn_usage_count(conn_p); | |
2380 | break; | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | if (!conn_p) | |
2385 | return; | |
2386 | ||
2387 | cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL); | |
2388 | if (!cmd) { | |
2389 | iscsit_dec_conn_usage_count(conn_p); | |
2390 | return; | |
2391 | } | |
2392 | ||
2393 | cmd->logout_cid = conn->cid; | |
2394 | cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; | |
2395 | cmd->i_state = ISTATE_SEND_ASYNCMSG; | |
2396 | ||
2397 | spin_lock_bh(&conn_p->cmd_lock); | |
2398 | list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list); | |
2399 | spin_unlock_bh(&conn_p->cmd_lock); | |
2400 | ||
2401 | iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); | |
2402 | iscsit_dec_conn_usage_count(conn_p); | |
2403 | } | |
2404 | ||
2405 | static int iscsit_send_conn_drop_async_message( | |
2406 | struct iscsi_cmd *cmd, | |
2407 | struct iscsi_conn *conn) | |
2408 | { | |
2409 | struct iscsi_async *hdr; | |
2410 | ||
2411 | cmd->tx_size = ISCSI_HDR_LEN; | |
2412 | cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; | |
2413 | ||
2414 | hdr = (struct iscsi_async *) cmd->pdu; | |
2415 | hdr->opcode = ISCSI_OP_ASYNC_EVENT; | |
2416 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
2417 | cmd->init_task_tag = 0xFFFFFFFF; | |
2418 | cmd->targ_xfer_tag = 0xFFFFFFFF; | |
2419 | put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); | |
2420 | cmd->stat_sn = conn->stat_sn++; | |
2421 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
2422 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2423 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2424 | hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; | |
2425 | hdr->param1 = cpu_to_be16(cmd->logout_cid); | |
2426 | hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); | |
2427 | hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); | |
2428 | ||
2429 | if (conn->conn_ops->HeaderDigest) { | |
2430 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2431 | ||
2432 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2433 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2434 | 0, NULL, (u8 *)header_digest); | |
2435 | ||
2436 | cmd->tx_size += ISCSI_CRC_LEN; | |
2437 | pr_debug("Attaching CRC32C HeaderDigest to" | |
2438 | " Async Message 0x%08x\n", *header_digest); | |
2439 | } | |
2440 | ||
2441 | cmd->iov_misc[0].iov_base = cmd->pdu; | |
2442 | cmd->iov_misc[0].iov_len = cmd->tx_size; | |
2443 | cmd->iov_misc_count = 1; | |
2444 | ||
2445 | pr_debug("Sending Connection Dropped Async Message StatSN:" | |
2446 | " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, | |
2447 | cmd->logout_cid, conn->cid); | |
2448 | return 0; | |
2449 | } | |
2450 | ||
2451 | static int iscsit_send_data_in( | |
2452 | struct iscsi_cmd *cmd, | |
2453 | struct iscsi_conn *conn, | |
2454 | int *eodr) | |
2455 | { | |
2456 | int iov_ret = 0, set_statsn = 0; | |
2457 | u32 iov_count = 0, tx_size = 0; | |
2458 | struct iscsi_datain datain; | |
2459 | struct iscsi_datain_req *dr; | |
2460 | struct iscsi_data_rsp *hdr; | |
2461 | struct kvec *iov; | |
2462 | ||
2463 | memset(&datain, 0, sizeof(struct iscsi_datain)); | |
2464 | dr = iscsit_get_datain_values(cmd, &datain); | |
2465 | if (!dr) { | |
2466 | pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", | |
2467 | cmd->init_task_tag); | |
2468 | return -1; | |
2469 | } | |
2470 | ||
2471 | /* | |
2472 | * Be paranoid and double check the logic for now. | |
2473 | */ | |
2474 | if ((datain.offset + datain.length) > cmd->data_length) { | |
2475 | pr_err("Command ITT: 0x%08x, datain.offset: %u and" | |
2476 | " datain.length: %u exceeds cmd->data_length: %u\n", | |
2477 | cmd->init_task_tag, datain.offset, datain.length, | |
2478 | cmd->data_length); | |
2479 | return -1; | |
2480 | } | |
2481 | ||
2482 | spin_lock_bh(&conn->sess->session_stats_lock); | |
2483 | conn->sess->tx_data_octets += datain.length; | |
2484 | if (conn->sess->se_sess->se_node_acl) { | |
2485 | spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
2486 | conn->sess->se_sess->se_node_acl->read_bytes += datain.length; | |
2487 | spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); | |
2488 | } | |
2489 | spin_unlock_bh(&conn->sess->session_stats_lock); | |
2490 | /* | |
2491 | * Special case for successfully execution w/ both DATAIN | |
2492 | * and Sense Data. | |
2493 | */ | |
2494 | if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && | |
2495 | (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) | |
2496 | datain.flags &= ~ISCSI_FLAG_DATA_STATUS; | |
2497 | else { | |
2498 | if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || | |
2499 | (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { | |
2500 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
2501 | cmd->stat_sn = conn->stat_sn++; | |
2502 | set_statsn = 1; | |
2503 | } else if (dr->dr_complete == | |
2504 | DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) | |
2505 | set_statsn = 1; | |
2506 | } | |
2507 | ||
2508 | hdr = (struct iscsi_data_rsp *) cmd->pdu; | |
2509 | memset(hdr, 0, ISCSI_HDR_LEN); | |
2510 | hdr->opcode = ISCSI_OP_SCSI_DATA_IN; | |
2511 | hdr->flags = datain.flags; | |
2512 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
2513 | if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { | |
2514 | hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; | |
2515 | hdr->residual_count = cpu_to_be32(cmd->residual_count); | |
2516 | } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
2517 | hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; | |
2518 | hdr->residual_count = cpu_to_be32(cmd->residual_count); | |
2519 | } | |
2520 | } | |
2521 | hton24(hdr->dlength, datain.length); | |
2522 | if (hdr->flags & ISCSI_FLAG_DATA_ACK) | |
2523 | int_to_scsilun(cmd->se_cmd.orig_fe_lun, | |
2524 | (struct scsi_lun *)&hdr->lun); | |
2525 | else | |
2526 | put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); | |
2527 | ||
2528 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
2529 | hdr->ttt = (hdr->flags & ISCSI_FLAG_DATA_ACK) ? | |
2530 | cpu_to_be32(cmd->targ_xfer_tag) : | |
2531 | 0xFFFFFFFF; | |
2532 | hdr->statsn = (set_statsn) ? cpu_to_be32(cmd->stat_sn) : | |
2533 | 0xFFFFFFFF; | |
2534 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2535 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2536 | hdr->datasn = cpu_to_be32(datain.data_sn); | |
2537 | hdr->offset = cpu_to_be32(datain.offset); | |
2538 | ||
2539 | iov = &cmd->iov_data[0]; | |
2540 | iov[iov_count].iov_base = cmd->pdu; | |
2541 | iov[iov_count++].iov_len = ISCSI_HDR_LEN; | |
2542 | tx_size += ISCSI_HDR_LEN; | |
2543 | ||
2544 | if (conn->conn_ops->HeaderDigest) { | |
2545 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2546 | ||
2547 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2548 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2549 | 0, NULL, (u8 *)header_digest); | |
2550 | ||
2551 | iov[0].iov_len += ISCSI_CRC_LEN; | |
2552 | tx_size += ISCSI_CRC_LEN; | |
2553 | ||
2554 | pr_debug("Attaching CRC32 HeaderDigest" | |
2555 | " for DataIN PDU 0x%08x\n", *header_digest); | |
2556 | } | |
2557 | ||
2558 | iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length); | |
2559 | if (iov_ret < 0) | |
2560 | return -1; | |
2561 | ||
2562 | iov_count += iov_ret; | |
2563 | tx_size += datain.length; | |
2564 | ||
2565 | cmd->padding = ((-datain.length) & 3); | |
2566 | if (cmd->padding) { | |
2567 | iov[iov_count].iov_base = cmd->pad_bytes; | |
2568 | iov[iov_count++].iov_len = cmd->padding; | |
2569 | tx_size += cmd->padding; | |
2570 | ||
2571 | pr_debug("Attaching %u padding bytes\n", | |
2572 | cmd->padding); | |
2573 | } | |
2574 | if (conn->conn_ops->DataDigest) { | |
2575 | cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, | |
2576 | datain.offset, datain.length, cmd->padding, cmd->pad_bytes); | |
2577 | ||
2578 | iov[iov_count].iov_base = &cmd->data_crc; | |
2579 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
2580 | tx_size += ISCSI_CRC_LEN; | |
2581 | ||
2582 | pr_debug("Attached CRC32C DataDigest %d bytes, crc" | |
2583 | " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); | |
2584 | } | |
2585 | ||
2586 | cmd->iov_data_count = iov_count; | |
2587 | cmd->tx_size = tx_size; | |
2588 | ||
2589 | pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," | |
2590 | " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", | |
2591 | cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), | |
2592 | ntohl(hdr->offset), datain.length, conn->cid); | |
2593 | ||
2594 | if (dr->dr_complete) { | |
2595 | *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? | |
2596 | 2 : 1; | |
2597 | iscsit_free_datain_req(cmd, dr); | |
2598 | } | |
2599 | ||
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | static int iscsit_send_logout_response( | |
2604 | struct iscsi_cmd *cmd, | |
2605 | struct iscsi_conn *conn) | |
2606 | { | |
2607 | int niov = 0, tx_size; | |
2608 | struct iscsi_conn *logout_conn = NULL; | |
2609 | struct iscsi_conn_recovery *cr = NULL; | |
2610 | struct iscsi_session *sess = conn->sess; | |
2611 | struct kvec *iov; | |
2612 | struct iscsi_logout_rsp *hdr; | |
2613 | /* | |
2614 | * The actual shutting down of Sessions and/or Connections | |
2615 | * for CLOSESESSION and CLOSECONNECTION Logout Requests | |
2616 | * is done in scsi_logout_post_handler(). | |
2617 | */ | |
2618 | switch (cmd->logout_reason) { | |
2619 | case ISCSI_LOGOUT_REASON_CLOSE_SESSION: | |
2620 | pr_debug("iSCSI session logout successful, setting" | |
2621 | " logout response to ISCSI_LOGOUT_SUCCESS.\n"); | |
2622 | cmd->logout_response = ISCSI_LOGOUT_SUCCESS; | |
2623 | break; | |
2624 | case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: | |
2625 | if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) | |
2626 | break; | |
2627 | /* | |
2628 | * For CLOSECONNECTION logout requests carrying | |
2629 | * a matching logout CID -> local CID, the reference | |
2630 | * for the local CID will have been incremented in | |
2631 | * iscsi_logout_closeconnection(). | |
2632 | * | |
2633 | * For CLOSECONNECTION logout requests carrying | |
2634 | * a different CID than the connection it arrived | |
2635 | * on, the connection responding to cmd->logout_cid | |
2636 | * is stopped in iscsit_logout_post_handler_diffcid(). | |
2637 | */ | |
2638 | ||
2639 | pr_debug("iSCSI CID: %hu logout on CID: %hu" | |
2640 | " successful.\n", cmd->logout_cid, conn->cid); | |
2641 | cmd->logout_response = ISCSI_LOGOUT_SUCCESS; | |
2642 | break; | |
2643 | case ISCSI_LOGOUT_REASON_RECOVERY: | |
2644 | if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || | |
2645 | (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) | |
2646 | break; | |
2647 | /* | |
2648 | * If the connection is still active from our point of view | |
2649 | * force connection recovery to occur. | |
2650 | */ | |
2651 | logout_conn = iscsit_get_conn_from_cid_rcfr(sess, | |
2652 | cmd->logout_cid); | |
2653 | if ((logout_conn)) { | |
2654 | iscsit_connection_reinstatement_rcfr(logout_conn); | |
2655 | iscsit_dec_conn_usage_count(logout_conn); | |
2656 | } | |
2657 | ||
2658 | cr = iscsit_get_inactive_connection_recovery_entry( | |
2659 | conn->sess, cmd->logout_cid); | |
2660 | if (!cr) { | |
2661 | pr_err("Unable to locate CID: %hu for" | |
2662 | " REMOVECONNFORRECOVERY Logout Request.\n", | |
2663 | cmd->logout_cid); | |
2664 | cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; | |
2665 | break; | |
2666 | } | |
2667 | ||
2668 | iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); | |
2669 | ||
2670 | pr_debug("iSCSI REMOVECONNFORRECOVERY logout" | |
2671 | " for recovery for CID: %hu on CID: %hu successful.\n", | |
2672 | cmd->logout_cid, conn->cid); | |
2673 | cmd->logout_response = ISCSI_LOGOUT_SUCCESS; | |
2674 | break; | |
2675 | default: | |
2676 | pr_err("Unknown cmd->logout_reason: 0x%02x\n", | |
2677 | cmd->logout_reason); | |
2678 | return -1; | |
2679 | } | |
2680 | ||
2681 | tx_size = ISCSI_HDR_LEN; | |
2682 | hdr = (struct iscsi_logout_rsp *)cmd->pdu; | |
2683 | memset(hdr, 0, ISCSI_HDR_LEN); | |
2684 | hdr->opcode = ISCSI_OP_LOGOUT_RSP; | |
2685 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2686 | hdr->response = cmd->logout_response; | |
2687 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
2688 | cmd->stat_sn = conn->stat_sn++; | |
2689 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
2690 | ||
2691 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
2692 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2693 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2694 | ||
2695 | iov = &cmd->iov_misc[0]; | |
2696 | iov[niov].iov_base = cmd->pdu; | |
2697 | iov[niov++].iov_len = ISCSI_HDR_LEN; | |
2698 | ||
2699 | if (conn->conn_ops->HeaderDigest) { | |
2700 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2701 | ||
2702 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2703 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2704 | 0, NULL, (u8 *)header_digest); | |
2705 | ||
2706 | iov[0].iov_len += ISCSI_CRC_LEN; | |
2707 | tx_size += ISCSI_CRC_LEN; | |
2708 | pr_debug("Attaching CRC32C HeaderDigest to" | |
2709 | " Logout Response 0x%08x\n", *header_digest); | |
2710 | } | |
2711 | cmd->iov_misc_count = niov; | |
2712 | cmd->tx_size = tx_size; | |
2713 | ||
2714 | pr_debug("Sending Logout Response ITT: 0x%08x StatSN:" | |
2715 | " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", | |
2716 | cmd->init_task_tag, cmd->stat_sn, hdr->response, | |
2717 | cmd->logout_cid, conn->cid); | |
2718 | ||
2719 | return 0; | |
2720 | } | |
2721 | ||
2722 | /* | |
2723 | * Unsolicited NOPIN, either requesting a response or not. | |
2724 | */ | |
2725 | static int iscsit_send_unsolicited_nopin( | |
2726 | struct iscsi_cmd *cmd, | |
2727 | struct iscsi_conn *conn, | |
2728 | int want_response) | |
2729 | { | |
2730 | int tx_size = ISCSI_HDR_LEN; | |
2731 | struct iscsi_nopin *hdr; | |
2732 | ||
2733 | hdr = (struct iscsi_nopin *) cmd->pdu; | |
2734 | memset(hdr, 0, ISCSI_HDR_LEN); | |
2735 | hdr->opcode = ISCSI_OP_NOOP_IN; | |
2736 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2737 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
2738 | hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); | |
2739 | cmd->stat_sn = conn->stat_sn; | |
2740 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
2741 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2742 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2743 | ||
2744 | if (conn->conn_ops->HeaderDigest) { | |
2745 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2746 | ||
2747 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2748 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2749 | 0, NULL, (u8 *)header_digest); | |
2750 | ||
2751 | tx_size += ISCSI_CRC_LEN; | |
2752 | pr_debug("Attaching CRC32C HeaderDigest to" | |
2753 | " NopIN 0x%08x\n", *header_digest); | |
2754 | } | |
2755 | ||
2756 | cmd->iov_misc[0].iov_base = cmd->pdu; | |
2757 | cmd->iov_misc[0].iov_len = tx_size; | |
2758 | cmd->iov_misc_count = 1; | |
2759 | cmd->tx_size = tx_size; | |
2760 | ||
2761 | pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" | |
2762 | " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); | |
2763 | ||
2764 | return 0; | |
2765 | } | |
2766 | ||
2767 | static int iscsit_send_nopin_response( | |
2768 | struct iscsi_cmd *cmd, | |
2769 | struct iscsi_conn *conn) | |
2770 | { | |
2771 | int niov = 0, tx_size; | |
2772 | u32 padding = 0; | |
2773 | struct kvec *iov; | |
2774 | struct iscsi_nopin *hdr; | |
2775 | ||
2776 | tx_size = ISCSI_HDR_LEN; | |
2777 | hdr = (struct iscsi_nopin *) cmd->pdu; | |
2778 | memset(hdr, 0, ISCSI_HDR_LEN); | |
2779 | hdr->opcode = ISCSI_OP_NOOP_IN; | |
2780 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2781 | hton24(hdr->dlength, cmd->buf_ptr_size); | |
2782 | put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); | |
2783 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
2784 | hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); | |
2785 | cmd->stat_sn = conn->stat_sn++; | |
2786 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
2787 | ||
2788 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
2789 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2790 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2791 | ||
2792 | iov = &cmd->iov_misc[0]; | |
2793 | iov[niov].iov_base = cmd->pdu; | |
2794 | iov[niov++].iov_len = ISCSI_HDR_LEN; | |
2795 | ||
2796 | if (conn->conn_ops->HeaderDigest) { | |
2797 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2798 | ||
2799 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2800 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2801 | 0, NULL, (u8 *)header_digest); | |
2802 | ||
2803 | iov[0].iov_len += ISCSI_CRC_LEN; | |
2804 | tx_size += ISCSI_CRC_LEN; | |
2805 | pr_debug("Attaching CRC32C HeaderDigest" | |
2806 | " to NopIn 0x%08x\n", *header_digest); | |
2807 | } | |
2808 | ||
2809 | /* | |
2810 | * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. | |
2811 | * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. | |
2812 | */ | |
2813 | if (cmd->buf_ptr_size) { | |
2814 | iov[niov].iov_base = cmd->buf_ptr; | |
2815 | iov[niov++].iov_len = cmd->buf_ptr_size; | |
2816 | tx_size += cmd->buf_ptr_size; | |
2817 | ||
2818 | pr_debug("Echoing back %u bytes of ping" | |
2819 | " data.\n", cmd->buf_ptr_size); | |
2820 | ||
2821 | padding = ((-cmd->buf_ptr_size) & 3); | |
2822 | if (padding != 0) { | |
2823 | iov[niov].iov_base = &cmd->pad_bytes; | |
2824 | iov[niov++].iov_len = padding; | |
2825 | tx_size += padding; | |
2826 | pr_debug("Attaching %u additional" | |
2827 | " padding bytes.\n", padding); | |
2828 | } | |
2829 | if (conn->conn_ops->DataDigest) { | |
2830 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2831 | cmd->buf_ptr, cmd->buf_ptr_size, | |
2832 | padding, (u8 *)&cmd->pad_bytes, | |
2833 | (u8 *)&cmd->data_crc); | |
2834 | ||
2835 | iov[niov].iov_base = &cmd->data_crc; | |
2836 | iov[niov++].iov_len = ISCSI_CRC_LEN; | |
2837 | tx_size += ISCSI_CRC_LEN; | |
2838 | pr_debug("Attached DataDigest for %u" | |
2839 | " bytes of ping data, CRC 0x%08x\n", | |
2840 | cmd->buf_ptr_size, cmd->data_crc); | |
2841 | } | |
2842 | } | |
2843 | ||
2844 | cmd->iov_misc_count = niov; | |
2845 | cmd->tx_size = tx_size; | |
2846 | ||
2847 | pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:" | |
2848 | " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag, | |
2849 | cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); | |
2850 | ||
2851 | return 0; | |
2852 | } | |
2853 | ||
2854 | int iscsit_send_r2t( | |
2855 | struct iscsi_cmd *cmd, | |
2856 | struct iscsi_conn *conn) | |
2857 | { | |
2858 | int tx_size = 0; | |
2859 | struct iscsi_r2t *r2t; | |
2860 | struct iscsi_r2t_rsp *hdr; | |
2861 | ||
2862 | r2t = iscsit_get_r2t_from_list(cmd); | |
2863 | if (!r2t) | |
2864 | return -1; | |
2865 | ||
2866 | hdr = (struct iscsi_r2t_rsp *) cmd->pdu; | |
2867 | memset(hdr, 0, ISCSI_HDR_LEN); | |
2868 | hdr->opcode = ISCSI_OP_R2T; | |
2869 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2870 | int_to_scsilun(cmd->se_cmd.orig_fe_lun, | |
2871 | (struct scsi_lun *)&hdr->lun); | |
2872 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
2873 | spin_lock_bh(&conn->sess->ttt_lock); | |
2874 | r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; | |
2875 | if (r2t->targ_xfer_tag == 0xFFFFFFFF) | |
2876 | r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; | |
2877 | spin_unlock_bh(&conn->sess->ttt_lock); | |
2878 | hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); | |
2879 | hdr->statsn = cpu_to_be32(conn->stat_sn); | |
2880 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
2881 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
2882 | hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); | |
2883 | hdr->data_offset = cpu_to_be32(r2t->offset); | |
2884 | hdr->data_length = cpu_to_be32(r2t->xfer_len); | |
2885 | ||
2886 | cmd->iov_misc[0].iov_base = cmd->pdu; | |
2887 | cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; | |
2888 | tx_size += ISCSI_HDR_LEN; | |
2889 | ||
2890 | if (conn->conn_ops->HeaderDigest) { | |
2891 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
2892 | ||
2893 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
2894 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
2895 | 0, NULL, (u8 *)header_digest); | |
2896 | ||
2897 | cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; | |
2898 | tx_size += ISCSI_CRC_LEN; | |
2899 | pr_debug("Attaching CRC32 HeaderDigest for R2T" | |
2900 | " PDU 0x%08x\n", *header_digest); | |
2901 | } | |
2902 | ||
2903 | pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" | |
2904 | " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", | |
2905 | (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, | |
2906 | r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, | |
2907 | r2t->offset, r2t->xfer_len, conn->cid); | |
2908 | ||
2909 | cmd->iov_misc_count = 1; | |
2910 | cmd->tx_size = tx_size; | |
2911 | ||
2912 | spin_lock_bh(&cmd->r2t_lock); | |
2913 | r2t->sent_r2t = 1; | |
2914 | spin_unlock_bh(&cmd->r2t_lock); | |
2915 | ||
2916 | return 0; | |
2917 | } | |
2918 | ||
2919 | /* | |
2920 | * type 0: Normal Operation. | |
2921 | * type 1: Called from Storage Transport. | |
2922 | * type 2: Called from iscsi_task_reassign_complete_write() for | |
2923 | * connection recovery. | |
2924 | */ | |
2925 | int iscsit_build_r2ts_for_cmd( | |
2926 | struct iscsi_cmd *cmd, | |
2927 | struct iscsi_conn *conn, | |
2928 | int type) | |
2929 | { | |
2930 | int first_r2t = 1; | |
2931 | u32 offset = 0, xfer_len = 0; | |
2932 | ||
2933 | spin_lock_bh(&cmd->r2t_lock); | |
2934 | if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { | |
2935 | spin_unlock_bh(&cmd->r2t_lock); | |
2936 | return 0; | |
2937 | } | |
2938 | ||
2939 | if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2)) | |
2940 | if (cmd->r2t_offset < cmd->write_data_done) | |
2941 | cmd->r2t_offset = cmd->write_data_done; | |
2942 | ||
2943 | while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { | |
2944 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
2945 | offset = cmd->r2t_offset; | |
2946 | ||
2947 | if (first_r2t && (type == 2)) { | |
2948 | xfer_len = ((offset + | |
2949 | (conn->sess->sess_ops->MaxBurstLength - | |
2950 | cmd->next_burst_len) > | |
2951 | cmd->data_length) ? | |
2952 | (cmd->data_length - offset) : | |
2953 | (conn->sess->sess_ops->MaxBurstLength - | |
2954 | cmd->next_burst_len)); | |
2955 | } else { | |
2956 | xfer_len = ((offset + | |
2957 | conn->sess->sess_ops->MaxBurstLength) > | |
2958 | cmd->data_length) ? | |
2959 | (cmd->data_length - offset) : | |
2960 | conn->sess->sess_ops->MaxBurstLength; | |
2961 | } | |
2962 | cmd->r2t_offset += xfer_len; | |
2963 | ||
2964 | if (cmd->r2t_offset == cmd->data_length) | |
2965 | cmd->cmd_flags |= ICF_SENT_LAST_R2T; | |
2966 | } else { | |
2967 | struct iscsi_seq *seq; | |
2968 | ||
2969 | seq = iscsit_get_seq_holder_for_r2t(cmd); | |
2970 | if (!seq) { | |
2971 | spin_unlock_bh(&cmd->r2t_lock); | |
2972 | return -1; | |
2973 | } | |
2974 | ||
2975 | offset = seq->offset; | |
2976 | xfer_len = seq->xfer_len; | |
2977 | ||
2978 | if (cmd->seq_send_order == cmd->seq_count) | |
2979 | cmd->cmd_flags |= ICF_SENT_LAST_R2T; | |
2980 | } | |
2981 | cmd->outstanding_r2ts++; | |
2982 | first_r2t = 0; | |
2983 | ||
2984 | if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { | |
2985 | spin_unlock_bh(&cmd->r2t_lock); | |
2986 | return -1; | |
2987 | } | |
2988 | ||
2989 | if (cmd->cmd_flags & ICF_SENT_LAST_R2T) | |
2990 | break; | |
2991 | } | |
2992 | spin_unlock_bh(&cmd->r2t_lock); | |
2993 | ||
2994 | return 0; | |
2995 | } | |
2996 | ||
2997 | static int iscsit_send_status( | |
2998 | struct iscsi_cmd *cmd, | |
2999 | struct iscsi_conn *conn) | |
3000 | { | |
3001 | u8 iov_count = 0, recovery; | |
3002 | u32 padding = 0, tx_size = 0; | |
3003 | struct iscsi_scsi_rsp *hdr; | |
3004 | struct kvec *iov; | |
3005 | ||
3006 | recovery = (cmd->i_state != ISTATE_SEND_STATUS); | |
3007 | if (!recovery) | |
3008 | cmd->stat_sn = conn->stat_sn++; | |
3009 | ||
3010 | spin_lock_bh(&conn->sess->session_stats_lock); | |
3011 | conn->sess->rsp_pdus++; | |
3012 | spin_unlock_bh(&conn->sess->session_stats_lock); | |
3013 | ||
3014 | hdr = (struct iscsi_scsi_rsp *) cmd->pdu; | |
3015 | memset(hdr, 0, ISCSI_HDR_LEN); | |
3016 | hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; | |
3017 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
3018 | if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { | |
3019 | hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; | |
3020 | hdr->residual_count = cpu_to_be32(cmd->residual_count); | |
3021 | } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { | |
3022 | hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; | |
3023 | hdr->residual_count = cpu_to_be32(cmd->residual_count); | |
3024 | } | |
3025 | hdr->response = cmd->iscsi_response; | |
3026 | hdr->cmd_status = cmd->se_cmd.scsi_status; | |
3027 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
3028 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
3029 | ||
3030 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
3031 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
3032 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
3033 | ||
3034 | iov = &cmd->iov_misc[0]; | |
3035 | iov[iov_count].iov_base = cmd->pdu; | |
3036 | iov[iov_count++].iov_len = ISCSI_HDR_LEN; | |
3037 | tx_size += ISCSI_HDR_LEN; | |
3038 | ||
3039 | /* | |
3040 | * Attach SENSE DATA payload to iSCSI Response PDU | |
3041 | */ | |
3042 | if (cmd->se_cmd.sense_buffer && | |
3043 | ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
3044 | (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
3045 | padding = -(cmd->se_cmd.scsi_sense_length) & 3; | |
3046 | hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length); | |
3047 | iov[iov_count].iov_base = cmd->se_cmd.sense_buffer; | |
3048 | iov[iov_count++].iov_len = | |
3049 | (cmd->se_cmd.scsi_sense_length + padding); | |
3050 | tx_size += cmd->se_cmd.scsi_sense_length; | |
3051 | ||
3052 | if (padding) { | |
3053 | memset(cmd->se_cmd.sense_buffer + | |
3054 | cmd->se_cmd.scsi_sense_length, 0, padding); | |
3055 | tx_size += padding; | |
3056 | pr_debug("Adding %u bytes of padding to" | |
3057 | " SENSE.\n", padding); | |
3058 | } | |
3059 | ||
3060 | if (conn->conn_ops->DataDigest) { | |
3061 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3062 | cmd->se_cmd.sense_buffer, | |
3063 | (cmd->se_cmd.scsi_sense_length + padding), | |
3064 | 0, NULL, (u8 *)&cmd->data_crc); | |
3065 | ||
3066 | iov[iov_count].iov_base = &cmd->data_crc; | |
3067 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
3068 | tx_size += ISCSI_CRC_LEN; | |
3069 | ||
3070 | pr_debug("Attaching CRC32 DataDigest for" | |
3071 | " SENSE, %u bytes CRC 0x%08x\n", | |
3072 | (cmd->se_cmd.scsi_sense_length + padding), | |
3073 | cmd->data_crc); | |
3074 | } | |
3075 | ||
3076 | pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" | |
3077 | " Response PDU\n", | |
3078 | cmd->se_cmd.scsi_sense_length); | |
3079 | } | |
3080 | ||
3081 | if (conn->conn_ops->HeaderDigest) { | |
3082 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
3083 | ||
3084 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3085 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
3086 | 0, NULL, (u8 *)header_digest); | |
3087 | ||
3088 | iov[0].iov_len += ISCSI_CRC_LEN; | |
3089 | tx_size += ISCSI_CRC_LEN; | |
3090 | pr_debug("Attaching CRC32 HeaderDigest for Response" | |
3091 | " PDU 0x%08x\n", *header_digest); | |
3092 | } | |
3093 | ||
3094 | cmd->iov_misc_count = iov_count; | |
3095 | cmd->tx_size = tx_size; | |
3096 | ||
3097 | pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x," | |
3098 | " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", | |
3099 | (!recovery) ? "" : "Recovery ", cmd->init_task_tag, | |
3100 | cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid); | |
3101 | ||
3102 | return 0; | |
3103 | } | |
3104 | ||
3105 | static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) | |
3106 | { | |
3107 | switch (se_tmr->response) { | |
3108 | case TMR_FUNCTION_COMPLETE: | |
3109 | return ISCSI_TMF_RSP_COMPLETE; | |
3110 | case TMR_TASK_DOES_NOT_EXIST: | |
3111 | return ISCSI_TMF_RSP_NO_TASK; | |
3112 | case TMR_LUN_DOES_NOT_EXIST: | |
3113 | return ISCSI_TMF_RSP_NO_LUN; | |
3114 | case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: | |
3115 | return ISCSI_TMF_RSP_NOT_SUPPORTED; | |
3116 | case TMR_FUNCTION_AUTHORIZATION_FAILED: | |
3117 | return ISCSI_TMF_RSP_AUTH_FAILED; | |
3118 | case TMR_FUNCTION_REJECTED: | |
3119 | default: | |
3120 | return ISCSI_TMF_RSP_REJECTED; | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | static int iscsit_send_task_mgt_rsp( | |
3125 | struct iscsi_cmd *cmd, | |
3126 | struct iscsi_conn *conn) | |
3127 | { | |
3128 | struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; | |
3129 | struct iscsi_tm_rsp *hdr; | |
3130 | u32 tx_size = 0; | |
3131 | ||
3132 | hdr = (struct iscsi_tm_rsp *) cmd->pdu; | |
3133 | memset(hdr, 0, ISCSI_HDR_LEN); | |
3134 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; | |
3135 | hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); | |
3136 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
3137 | cmd->stat_sn = conn->stat_sn++; | |
3138 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
3139 | ||
3140 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
3141 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
3142 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
3143 | ||
3144 | cmd->iov_misc[0].iov_base = cmd->pdu; | |
3145 | cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; | |
3146 | tx_size += ISCSI_HDR_LEN; | |
3147 | ||
3148 | if (conn->conn_ops->HeaderDigest) { | |
3149 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
3150 | ||
3151 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3152 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
3153 | 0, NULL, (u8 *)header_digest); | |
3154 | ||
3155 | cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; | |
3156 | tx_size += ISCSI_CRC_LEN; | |
3157 | pr_debug("Attaching CRC32 HeaderDigest for Task" | |
3158 | " Mgmt Response PDU 0x%08x\n", *header_digest); | |
3159 | } | |
3160 | ||
3161 | cmd->iov_misc_count = 1; | |
3162 | cmd->tx_size = tx_size; | |
3163 | ||
3164 | pr_debug("Built Task Management Response ITT: 0x%08x," | |
3165 | " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", | |
3166 | cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); | |
3167 | ||
3168 | return 0; | |
3169 | } | |
3170 | ||
3171 | static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) | |
3172 | { | |
3173 | char *payload = NULL; | |
3174 | struct iscsi_conn *conn = cmd->conn; | |
3175 | struct iscsi_portal_group *tpg; | |
3176 | struct iscsi_tiqn *tiqn; | |
3177 | struct iscsi_tpg_np *tpg_np; | |
3178 | int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; | |
3179 | unsigned char buf[256]; | |
3180 | ||
3181 | buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ? | |
3182 | 32768 : conn->conn_ops->MaxRecvDataSegmentLength; | |
3183 | ||
3184 | memset(buf, 0, 256); | |
3185 | ||
3186 | payload = kzalloc(buffer_len, GFP_KERNEL); | |
3187 | if (!payload) { | |
3188 | pr_err("Unable to allocate memory for sendtargets" | |
3189 | " response.\n"); | |
3190 | return -ENOMEM; | |
3191 | } | |
3192 | ||
3193 | spin_lock(&tiqn_lock); | |
3194 | list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { | |
3195 | len = sprintf(buf, "TargetName=%s", tiqn->tiqn); | |
3196 | len += 1; | |
3197 | ||
3198 | if ((len + payload_len) > buffer_len) { | |
3199 | spin_unlock(&tiqn->tiqn_tpg_lock); | |
3200 | end_of_buf = 1; | |
3201 | goto eob; | |
3202 | } | |
3203 | memcpy((void *)payload + payload_len, buf, len); | |
3204 | payload_len += len; | |
3205 | ||
3206 | spin_lock(&tiqn->tiqn_tpg_lock); | |
3207 | list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { | |
3208 | ||
3209 | spin_lock(&tpg->tpg_state_lock); | |
3210 | if ((tpg->tpg_state == TPG_STATE_FREE) || | |
3211 | (tpg->tpg_state == TPG_STATE_INACTIVE)) { | |
3212 | spin_unlock(&tpg->tpg_state_lock); | |
3213 | continue; | |
3214 | } | |
3215 | spin_unlock(&tpg->tpg_state_lock); | |
3216 | ||
3217 | spin_lock(&tpg->tpg_np_lock); | |
3218 | list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, | |
3219 | tpg_np_list) { | |
3220 | len = sprintf(buf, "TargetAddress=" | |
3221 | "%s%s%s:%hu,%hu", | |
3222 | (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? | |
3223 | "[" : "", tpg_np->tpg_np->np_ip, | |
3224 | (tpg_np->tpg_np->np_sockaddr.ss_family == AF_INET6) ? | |
3225 | "]" : "", tpg_np->tpg_np->np_port, | |
3226 | tpg->tpgt); | |
3227 | len += 1; | |
3228 | ||
3229 | if ((len + payload_len) > buffer_len) { | |
3230 | spin_unlock(&tpg->tpg_np_lock); | |
3231 | spin_unlock(&tiqn->tiqn_tpg_lock); | |
3232 | end_of_buf = 1; | |
3233 | goto eob; | |
3234 | } | |
3235 | memcpy((void *)payload + payload_len, buf, len); | |
3236 | payload_len += len; | |
3237 | } | |
3238 | spin_unlock(&tpg->tpg_np_lock); | |
3239 | } | |
3240 | spin_unlock(&tiqn->tiqn_tpg_lock); | |
3241 | eob: | |
3242 | if (end_of_buf) | |
3243 | break; | |
3244 | } | |
3245 | spin_unlock(&tiqn_lock); | |
3246 | ||
3247 | cmd->buf_ptr = payload; | |
3248 | ||
3249 | return payload_len; | |
3250 | } | |
3251 | ||
3252 | /* | |
3253 | * FIXME: Add support for F_BIT and C_BIT when the length is longer than | |
3254 | * MaxRecvDataSegmentLength. | |
3255 | */ | |
3256 | static int iscsit_send_text_rsp( | |
3257 | struct iscsi_cmd *cmd, | |
3258 | struct iscsi_conn *conn) | |
3259 | { | |
3260 | struct iscsi_text_rsp *hdr; | |
3261 | struct kvec *iov; | |
3262 | u32 padding = 0, tx_size = 0; | |
3263 | int text_length, iov_count = 0; | |
3264 | ||
3265 | text_length = iscsit_build_sendtargets_response(cmd); | |
3266 | if (text_length < 0) | |
3267 | return text_length; | |
3268 | ||
3269 | padding = ((-text_length) & 3); | |
3270 | if (padding != 0) { | |
3271 | memset(cmd->buf_ptr + text_length, 0, padding); | |
3272 | pr_debug("Attaching %u additional bytes for" | |
3273 | " padding.\n", padding); | |
3274 | } | |
3275 | ||
3276 | hdr = (struct iscsi_text_rsp *) cmd->pdu; | |
3277 | memset(hdr, 0, ISCSI_HDR_LEN); | |
3278 | hdr->opcode = ISCSI_OP_TEXT_RSP; | |
3279 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
3280 | hton24(hdr->dlength, text_length); | |
3281 | hdr->itt = cpu_to_be32(cmd->init_task_tag); | |
3282 | hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); | |
3283 | cmd->stat_sn = conn->stat_sn++; | |
3284 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
3285 | ||
3286 | iscsit_increment_maxcmdsn(cmd, conn->sess); | |
3287 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
3288 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
3289 | ||
3290 | iov = &cmd->iov_misc[0]; | |
3291 | ||
3292 | iov[iov_count].iov_base = cmd->pdu; | |
3293 | iov[iov_count++].iov_len = ISCSI_HDR_LEN; | |
3294 | iov[iov_count].iov_base = cmd->buf_ptr; | |
3295 | iov[iov_count++].iov_len = text_length + padding; | |
3296 | ||
3297 | tx_size += (ISCSI_HDR_LEN + text_length + padding); | |
3298 | ||
3299 | if (conn->conn_ops->HeaderDigest) { | |
3300 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
3301 | ||
3302 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3303 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
3304 | 0, NULL, (u8 *)header_digest); | |
3305 | ||
3306 | iov[0].iov_len += ISCSI_CRC_LEN; | |
3307 | tx_size += ISCSI_CRC_LEN; | |
3308 | pr_debug("Attaching CRC32 HeaderDigest for" | |
3309 | " Text Response PDU 0x%08x\n", *header_digest); | |
3310 | } | |
3311 | ||
3312 | if (conn->conn_ops->DataDigest) { | |
3313 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3314 | cmd->buf_ptr, (text_length + padding), | |
3315 | 0, NULL, (u8 *)&cmd->data_crc); | |
3316 | ||
3317 | iov[iov_count].iov_base = &cmd->data_crc; | |
3318 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
3319 | tx_size += ISCSI_CRC_LEN; | |
3320 | ||
3321 | pr_debug("Attaching DataDigest for %u bytes of text" | |
3322 | " data, CRC 0x%08x\n", (text_length + padding), | |
3323 | cmd->data_crc); | |
3324 | } | |
3325 | ||
3326 | cmd->iov_misc_count = iov_count; | |
3327 | cmd->tx_size = tx_size; | |
3328 | ||
3329 | pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," | |
3330 | " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, | |
3331 | text_length, conn->cid); | |
3332 | return 0; | |
3333 | } | |
3334 | ||
3335 | static int iscsit_send_reject( | |
3336 | struct iscsi_cmd *cmd, | |
3337 | struct iscsi_conn *conn) | |
3338 | { | |
3339 | u32 iov_count = 0, tx_size = 0; | |
3340 | struct iscsi_reject *hdr; | |
3341 | struct kvec *iov; | |
3342 | ||
3343 | hdr = (struct iscsi_reject *) cmd->pdu; | |
3344 | hdr->opcode = ISCSI_OP_REJECT; | |
3345 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
3346 | hton24(hdr->dlength, ISCSI_HDR_LEN); | |
3347 | cmd->stat_sn = conn->stat_sn++; | |
3348 | hdr->statsn = cpu_to_be32(cmd->stat_sn); | |
3349 | hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); | |
3350 | hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); | |
3351 | ||
3352 | iov = &cmd->iov_misc[0]; | |
3353 | ||
3354 | iov[iov_count].iov_base = cmd->pdu; | |
3355 | iov[iov_count++].iov_len = ISCSI_HDR_LEN; | |
3356 | iov[iov_count].iov_base = cmd->buf_ptr; | |
3357 | iov[iov_count++].iov_len = ISCSI_HDR_LEN; | |
3358 | ||
3359 | tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); | |
3360 | ||
3361 | if (conn->conn_ops->HeaderDigest) { | |
3362 | u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; | |
3363 | ||
3364 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3365 | (unsigned char *)hdr, ISCSI_HDR_LEN, | |
3366 | 0, NULL, (u8 *)header_digest); | |
3367 | ||
3368 | iov[0].iov_len += ISCSI_CRC_LEN; | |
3369 | tx_size += ISCSI_CRC_LEN; | |
3370 | pr_debug("Attaching CRC32 HeaderDigest for" | |
3371 | " REJECT PDU 0x%08x\n", *header_digest); | |
3372 | } | |
3373 | ||
3374 | if (conn->conn_ops->DataDigest) { | |
3375 | iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, | |
3376 | (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN, | |
3377 | 0, NULL, (u8 *)&cmd->data_crc); | |
3378 | ||
3379 | iov[iov_count].iov_base = &cmd->data_crc; | |
3380 | iov[iov_count++].iov_len = ISCSI_CRC_LEN; | |
3381 | tx_size += ISCSI_CRC_LEN; | |
3382 | pr_debug("Attaching CRC32 DataDigest for REJECT" | |
3383 | " PDU 0x%08x\n", cmd->data_crc); | |
3384 | } | |
3385 | ||
3386 | cmd->iov_misc_count = iov_count; | |
3387 | cmd->tx_size = tx_size; | |
3388 | ||
3389 | pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," | |
3390 | " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); | |
3391 | ||
3392 | return 0; | |
3393 | } | |
3394 | ||
3395 | static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) | |
3396 | { | |
3397 | if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || | |
3398 | (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { | |
3399 | wait_for_completion_interruptible_timeout( | |
3400 | &conn->tx_half_close_comp, | |
3401 | ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); | |
3402 | } | |
3403 | } | |
3404 | ||
3405 | #ifdef CONFIG_SMP | |
3406 | ||
3407 | void iscsit_thread_get_cpumask(struct iscsi_conn *conn) | |
3408 | { | |
3409 | struct iscsi_thread_set *ts = conn->thread_set; | |
3410 | int ord, cpu; | |
3411 | /* | |
3412 | * thread_id is assigned from iscsit_global->ts_bitmap from | |
3413 | * within iscsi_thread_set.c:iscsi_allocate_thread_sets() | |
3414 | * | |
3415 | * Here we use thread_id to determine which CPU that this | |
3416 | * iSCSI connection's iscsi_thread_set will be scheduled to | |
3417 | * execute upon. | |
3418 | */ | |
3419 | ord = ts->thread_id % cpumask_weight(cpu_online_mask); | |
3420 | #if 0 | |
3421 | pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from" | |
3422 | " thread_id: %d\n", ord, ts->thread_id); | |
3423 | #endif | |
3424 | for_each_online_cpu(cpu) { | |
3425 | if (ord-- == 0) { | |
3426 | cpumask_set_cpu(cpu, conn->conn_cpumask); | |
3427 | return; | |
3428 | } | |
3429 | } | |
3430 | /* | |
3431 | * This should never be reached.. | |
3432 | */ | |
3433 | dump_stack(); | |
3434 | cpumask_setall(conn->conn_cpumask); | |
3435 | } | |
3436 | ||
3437 | static inline void iscsit_thread_check_cpumask( | |
3438 | struct iscsi_conn *conn, | |
3439 | struct task_struct *p, | |
3440 | int mode) | |
3441 | { | |
3442 | char buf[128]; | |
3443 | /* | |
3444 | * mode == 1 signals iscsi_target_tx_thread() usage. | |
3445 | * mode == 0 signals iscsi_target_rx_thread() usage. | |
3446 | */ | |
3447 | if (mode == 1) { | |
3448 | if (!conn->conn_tx_reset_cpumask) | |
3449 | return; | |
3450 | conn->conn_tx_reset_cpumask = 0; | |
3451 | } else { | |
3452 | if (!conn->conn_rx_reset_cpumask) | |
3453 | return; | |
3454 | conn->conn_rx_reset_cpumask = 0; | |
3455 | } | |
3456 | /* | |
3457 | * Update the CPU mask for this single kthread so that | |
3458 | * both TX and RX kthreads are scheduled to run on the | |
3459 | * same CPU. | |
3460 | */ | |
3461 | memset(buf, 0, 128); | |
3462 | cpumask_scnprintf(buf, 128, conn->conn_cpumask); | |
3463 | #if 0 | |
3464 | pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():" | |
3465 | " %s for %s\n", buf, p->comm); | |
3466 | #endif | |
3467 | set_cpus_allowed_ptr(p, conn->conn_cpumask); | |
3468 | } | |
3469 | ||
3470 | #else | |
aadcec01 NB |
3471 | |
3472 | void iscsit_thread_get_cpumask(struct iscsi_conn *conn) | |
3473 | { | |
3474 | return; | |
3475 | } | |
3476 | ||
e48354ce NB |
3477 | #define iscsit_thread_check_cpumask(X, Y, Z) ({}) |
3478 | #endif /* CONFIG_SMP */ | |
3479 | ||
3480 | int iscsi_target_tx_thread(void *arg) | |
3481 | { | |
3482 | u8 state; | |
3483 | int eodr = 0; | |
3484 | int ret = 0; | |
3485 | int sent_status = 0; | |
3486 | int use_misc = 0; | |
3487 | int map_sg = 0; | |
3488 | struct iscsi_cmd *cmd = NULL; | |
3489 | struct iscsi_conn *conn; | |
3490 | struct iscsi_queue_req *qr = NULL; | |
3491 | struct se_cmd *se_cmd; | |
3492 | struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg; | |
3493 | /* | |
3494 | * Allow ourselves to be interrupted by SIGINT so that a | |
3495 | * connection recovery / failure event can be triggered externally. | |
3496 | */ | |
3497 | allow_signal(SIGINT); | |
3498 | ||
3499 | restart: | |
3500 | conn = iscsi_tx_thread_pre_handler(ts); | |
3501 | if (!conn) | |
3502 | goto out; | |
3503 | ||
3504 | eodr = map_sg = ret = sent_status = use_misc = 0; | |
3505 | ||
3506 | while (!kthread_should_stop()) { | |
3507 | /* | |
3508 | * Ensure that both TX and RX per connection kthreads | |
3509 | * are scheduled to run on the same CPU. | |
3510 | */ | |
3511 | iscsit_thread_check_cpumask(conn, current, 1); | |
3512 | ||
3513 | schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT); | |
3514 | ||
3515 | if ((ts->status == ISCSI_THREAD_SET_RESET) || | |
3516 | signal_pending(current)) | |
3517 | goto transport_err; | |
3518 | ||
3519 | get_immediate: | |
3520 | qr = iscsit_get_cmd_from_immediate_queue(conn); | |
3521 | if (qr) { | |
3522 | atomic_set(&conn->check_immediate_queue, 0); | |
3523 | cmd = qr->cmd; | |
3524 | state = qr->state; | |
3525 | kmem_cache_free(lio_qr_cache, qr); | |
3526 | ||
3527 | spin_lock_bh(&cmd->istate_lock); | |
3528 | switch (state) { | |
3529 | case ISTATE_SEND_R2T: | |
3530 | spin_unlock_bh(&cmd->istate_lock); | |
3531 | ret = iscsit_send_r2t(cmd, conn); | |
3532 | break; | |
3533 | case ISTATE_REMOVE: | |
3534 | spin_unlock_bh(&cmd->istate_lock); | |
3535 | ||
3536 | if (cmd->data_direction == DMA_TO_DEVICE) | |
3537 | iscsit_stop_dataout_timer(cmd); | |
3538 | ||
3539 | spin_lock_bh(&conn->cmd_lock); | |
3540 | list_del(&cmd->i_list); | |
3541 | spin_unlock_bh(&conn->cmd_lock); | |
3542 | /* | |
3543 | * Determine if a struct se_cmd is assoicated with | |
3544 | * this struct iscsi_cmd. | |
3545 | */ | |
3546 | if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) && | |
3547 | !(cmd->tmr_req)) | |
3548 | iscsit_release_cmd(cmd); | |
3549 | else | |
3550 | transport_generic_free_cmd(&cmd->se_cmd, | |
3551 | 1, 0); | |
3552 | goto get_immediate; | |
3553 | case ISTATE_SEND_NOPIN_WANT_RESPONSE: | |
3554 | spin_unlock_bh(&cmd->istate_lock); | |
3555 | iscsit_mod_nopin_response_timer(conn); | |
3556 | ret = iscsit_send_unsolicited_nopin(cmd, | |
3557 | conn, 1); | |
3558 | break; | |
3559 | case ISTATE_SEND_NOPIN_NO_RESPONSE: | |
3560 | spin_unlock_bh(&cmd->istate_lock); | |
3561 | ret = iscsit_send_unsolicited_nopin(cmd, | |
3562 | conn, 0); | |
3563 | break; | |
3564 | default: | |
3565 | pr_err("Unknown Opcode: 0x%02x ITT:" | |
3566 | " 0x%08x, i_state: %d on CID: %hu\n", | |
3567 | cmd->iscsi_opcode, cmd->init_task_tag, state, | |
3568 | conn->cid); | |
3569 | spin_unlock_bh(&cmd->istate_lock); | |
3570 | goto transport_err; | |
3571 | } | |
3572 | if (ret < 0) { | |
3573 | conn->tx_immediate_queue = 0; | |
3574 | goto transport_err; | |
3575 | } | |
3576 | ||
3577 | if (iscsit_send_tx_data(cmd, conn, 1) < 0) { | |
3578 | conn->tx_immediate_queue = 0; | |
3579 | iscsit_tx_thread_wait_for_tcp(conn); | |
3580 | goto transport_err; | |
3581 | } | |
3582 | ||
3583 | spin_lock_bh(&cmd->istate_lock); | |
3584 | switch (state) { | |
3585 | case ISTATE_SEND_R2T: | |
3586 | spin_unlock_bh(&cmd->istate_lock); | |
3587 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
3588 | iscsit_start_dataout_timer(cmd, conn); | |
3589 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
3590 | break; | |
3591 | case ISTATE_SEND_NOPIN_WANT_RESPONSE: | |
3592 | cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE; | |
3593 | spin_unlock_bh(&cmd->istate_lock); | |
3594 | break; | |
3595 | case ISTATE_SEND_NOPIN_NO_RESPONSE: | |
3596 | cmd->i_state = ISTATE_SENT_STATUS; | |
3597 | spin_unlock_bh(&cmd->istate_lock); | |
3598 | break; | |
3599 | default: | |
3600 | pr_err("Unknown Opcode: 0x%02x ITT:" | |
3601 | " 0x%08x, i_state: %d on CID: %hu\n", | |
3602 | cmd->iscsi_opcode, cmd->init_task_tag, | |
3603 | state, conn->cid); | |
3604 | spin_unlock_bh(&cmd->istate_lock); | |
3605 | goto transport_err; | |
3606 | } | |
3607 | goto get_immediate; | |
3608 | } else | |
3609 | conn->tx_immediate_queue = 0; | |
3610 | ||
3611 | get_response: | |
3612 | qr = iscsit_get_cmd_from_response_queue(conn); | |
3613 | if (qr) { | |
3614 | cmd = qr->cmd; | |
3615 | state = qr->state; | |
3616 | kmem_cache_free(lio_qr_cache, qr); | |
3617 | ||
3618 | spin_lock_bh(&cmd->istate_lock); | |
3619 | check_rsp_state: | |
3620 | switch (state) { | |
3621 | case ISTATE_SEND_DATAIN: | |
3622 | spin_unlock_bh(&cmd->istate_lock); | |
3623 | ret = iscsit_send_data_in(cmd, conn, | |
3624 | &eodr); | |
3625 | map_sg = 1; | |
3626 | break; | |
3627 | case ISTATE_SEND_STATUS: | |
3628 | case ISTATE_SEND_STATUS_RECOVERY: | |
3629 | spin_unlock_bh(&cmd->istate_lock); | |
3630 | use_misc = 1; | |
3631 | ret = iscsit_send_status(cmd, conn); | |
3632 | break; | |
3633 | case ISTATE_SEND_LOGOUTRSP: | |
3634 | spin_unlock_bh(&cmd->istate_lock); | |
3635 | use_misc = 1; | |
3636 | ret = iscsit_send_logout_response(cmd, conn); | |
3637 | break; | |
3638 | case ISTATE_SEND_ASYNCMSG: | |
3639 | spin_unlock_bh(&cmd->istate_lock); | |
3640 | use_misc = 1; | |
3641 | ret = iscsit_send_conn_drop_async_message( | |
3642 | cmd, conn); | |
3643 | break; | |
3644 | case ISTATE_SEND_NOPIN: | |
3645 | spin_unlock_bh(&cmd->istate_lock); | |
3646 | use_misc = 1; | |
3647 | ret = iscsit_send_nopin_response(cmd, conn); | |
3648 | break; | |
3649 | case ISTATE_SEND_REJECT: | |
3650 | spin_unlock_bh(&cmd->istate_lock); | |
3651 | use_misc = 1; | |
3652 | ret = iscsit_send_reject(cmd, conn); | |
3653 | break; | |
3654 | case ISTATE_SEND_TASKMGTRSP: | |
3655 | spin_unlock_bh(&cmd->istate_lock); | |
3656 | use_misc = 1; | |
3657 | ret = iscsit_send_task_mgt_rsp(cmd, conn); | |
3658 | if (ret != 0) | |
3659 | break; | |
3660 | ret = iscsit_tmr_post_handler(cmd, conn); | |
3661 | if (ret != 0) | |
3662 | iscsit_fall_back_to_erl0(conn->sess); | |
3663 | break; | |
3664 | case ISTATE_SEND_TEXTRSP: | |
3665 | spin_unlock_bh(&cmd->istate_lock); | |
3666 | use_misc = 1; | |
3667 | ret = iscsit_send_text_rsp(cmd, conn); | |
3668 | break; | |
3669 | default: | |
3670 | pr_err("Unknown Opcode: 0x%02x ITT:" | |
3671 | " 0x%08x, i_state: %d on CID: %hu\n", | |
3672 | cmd->iscsi_opcode, cmd->init_task_tag, | |
3673 | state, conn->cid); | |
3674 | spin_unlock_bh(&cmd->istate_lock); | |
3675 | goto transport_err; | |
3676 | } | |
3677 | if (ret < 0) { | |
3678 | conn->tx_response_queue = 0; | |
3679 | goto transport_err; | |
3680 | } | |
3681 | ||
3682 | se_cmd = &cmd->se_cmd; | |
3683 | ||
3684 | if (map_sg && !conn->conn_ops->IFMarker) { | |
3685 | if (iscsit_fe_sendpage_sg(cmd, conn) < 0) { | |
3686 | conn->tx_response_queue = 0; | |
3687 | iscsit_tx_thread_wait_for_tcp(conn); | |
3688 | iscsit_unmap_iovec(cmd); | |
3689 | goto transport_err; | |
3690 | } | |
3691 | } else { | |
3692 | if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) { | |
3693 | conn->tx_response_queue = 0; | |
3694 | iscsit_tx_thread_wait_for_tcp(conn); | |
3695 | iscsit_unmap_iovec(cmd); | |
3696 | goto transport_err; | |
3697 | } | |
3698 | } | |
3699 | map_sg = 0; | |
3700 | iscsit_unmap_iovec(cmd); | |
3701 | ||
3702 | spin_lock_bh(&cmd->istate_lock); | |
3703 | switch (state) { | |
3704 | case ISTATE_SEND_DATAIN: | |
3705 | if (!eodr) | |
3706 | goto check_rsp_state; | |
3707 | ||
3708 | if (eodr == 1) { | |
3709 | cmd->i_state = ISTATE_SENT_LAST_DATAIN; | |
3710 | sent_status = 1; | |
3711 | eodr = use_misc = 0; | |
3712 | } else if (eodr == 2) { | |
3713 | cmd->i_state = state = | |
3714 | ISTATE_SEND_STATUS; | |
3715 | sent_status = 0; | |
3716 | eodr = use_misc = 0; | |
3717 | goto check_rsp_state; | |
3718 | } | |
3719 | break; | |
3720 | case ISTATE_SEND_STATUS: | |
3721 | use_misc = 0; | |
3722 | sent_status = 1; | |
3723 | break; | |
3724 | case ISTATE_SEND_ASYNCMSG: | |
3725 | case ISTATE_SEND_NOPIN: | |
3726 | case ISTATE_SEND_STATUS_RECOVERY: | |
3727 | case ISTATE_SEND_TEXTRSP: | |
3728 | use_misc = 0; | |
3729 | sent_status = 1; | |
3730 | break; | |
3731 | case ISTATE_SEND_REJECT: | |
3732 | use_misc = 0; | |
3733 | if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) { | |
3734 | cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN; | |
3735 | spin_unlock_bh(&cmd->istate_lock); | |
3736 | complete(&cmd->reject_comp); | |
3737 | goto transport_err; | |
3738 | } | |
3739 | complete(&cmd->reject_comp); | |
3740 | break; | |
3741 | case ISTATE_SEND_TASKMGTRSP: | |
3742 | use_misc = 0; | |
3743 | sent_status = 1; | |
3744 | break; | |
3745 | case ISTATE_SEND_LOGOUTRSP: | |
3746 | spin_unlock_bh(&cmd->istate_lock); | |
3747 | if (!iscsit_logout_post_handler(cmd, conn)) | |
3748 | goto restart; | |
3749 | spin_lock_bh(&cmd->istate_lock); | |
3750 | use_misc = 0; | |
3751 | sent_status = 1; | |
3752 | break; | |
3753 | default: | |
3754 | pr_err("Unknown Opcode: 0x%02x ITT:" | |
3755 | " 0x%08x, i_state: %d on CID: %hu\n", | |
3756 | cmd->iscsi_opcode, cmd->init_task_tag, | |
3757 | cmd->i_state, conn->cid); | |
3758 | spin_unlock_bh(&cmd->istate_lock); | |
3759 | goto transport_err; | |
3760 | } | |
3761 | ||
3762 | if (sent_status) { | |
3763 | cmd->i_state = ISTATE_SENT_STATUS; | |
3764 | sent_status = 0; | |
3765 | } | |
3766 | spin_unlock_bh(&cmd->istate_lock); | |
3767 | ||
3768 | if (atomic_read(&conn->check_immediate_queue)) | |
3769 | goto get_immediate; | |
3770 | ||
3771 | goto get_response; | |
3772 | } else | |
3773 | conn->tx_response_queue = 0; | |
3774 | } | |
3775 | ||
3776 | transport_err: | |
3777 | iscsit_take_action_for_connection_exit(conn); | |
3778 | goto restart; | |
3779 | out: | |
3780 | return 0; | |
3781 | } | |
3782 | ||
3783 | int iscsi_target_rx_thread(void *arg) | |
3784 | { | |
3785 | int ret; | |
3786 | u8 buffer[ISCSI_HDR_LEN], opcode; | |
3787 | u32 checksum = 0, digest = 0; | |
3788 | struct iscsi_conn *conn = NULL; | |
3789 | struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg; | |
3790 | struct kvec iov; | |
3791 | /* | |
3792 | * Allow ourselves to be interrupted by SIGINT so that a | |
3793 | * connection recovery / failure event can be triggered externally. | |
3794 | */ | |
3795 | allow_signal(SIGINT); | |
3796 | ||
3797 | restart: | |
3798 | conn = iscsi_rx_thread_pre_handler(ts); | |
3799 | if (!conn) | |
3800 | goto out; | |
3801 | ||
3802 | while (!kthread_should_stop()) { | |
3803 | /* | |
3804 | * Ensure that both TX and RX per connection kthreads | |
3805 | * are scheduled to run on the same CPU. | |
3806 | */ | |
3807 | iscsit_thread_check_cpumask(conn, current, 0); | |
3808 | ||
3809 | memset(buffer, 0, ISCSI_HDR_LEN); | |
3810 | memset(&iov, 0, sizeof(struct kvec)); | |
3811 | ||
3812 | iov.iov_base = buffer; | |
3813 | iov.iov_len = ISCSI_HDR_LEN; | |
3814 | ||
3815 | ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); | |
3816 | if (ret != ISCSI_HDR_LEN) { | |
3817 | iscsit_rx_thread_wait_for_tcp(conn); | |
3818 | goto transport_err; | |
3819 | } | |
3820 | ||
3821 | /* | |
3822 | * Set conn->bad_hdr for use with REJECT PDUs. | |
3823 | */ | |
3824 | memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN); | |
3825 | ||
3826 | if (conn->conn_ops->HeaderDigest) { | |
3827 | iov.iov_base = &digest; | |
3828 | iov.iov_len = ISCSI_CRC_LEN; | |
3829 | ||
3830 | ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); | |
3831 | if (ret != ISCSI_CRC_LEN) { | |
3832 | iscsit_rx_thread_wait_for_tcp(conn); | |
3833 | goto transport_err; | |
3834 | } | |
3835 | ||
3836 | iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, | |
3837 | buffer, ISCSI_HDR_LEN, | |
3838 | 0, NULL, (u8 *)&checksum); | |
3839 | ||
3840 | if (digest != checksum) { | |
3841 | pr_err("HeaderDigest CRC32C failed," | |
3842 | " received 0x%08x, computed 0x%08x\n", | |
3843 | digest, checksum); | |
3844 | /* | |
3845 | * Set the PDU to 0xff so it will intentionally | |
3846 | * hit default in the switch below. | |
3847 | */ | |
3848 | memset(buffer, 0xff, ISCSI_HDR_LEN); | |
3849 | spin_lock_bh(&conn->sess->session_stats_lock); | |
3850 | conn->sess->conn_digest_errors++; | |
3851 | spin_unlock_bh(&conn->sess->session_stats_lock); | |
3852 | } else { | |
3853 | pr_debug("Got HeaderDigest CRC32C" | |
3854 | " 0x%08x\n", checksum); | |
3855 | } | |
3856 | } | |
3857 | ||
3858 | if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) | |
3859 | goto transport_err; | |
3860 | ||
3861 | opcode = buffer[0] & ISCSI_OPCODE_MASK; | |
3862 | ||
3863 | if (conn->sess->sess_ops->SessionType && | |
3864 | ((!(opcode & ISCSI_OP_TEXT)) || | |
3865 | (!(opcode & ISCSI_OP_LOGOUT)))) { | |
3866 | pr_err("Received illegal iSCSI Opcode: 0x%02x" | |
3867 | " while in Discovery Session, rejecting.\n", opcode); | |
3868 | iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, | |
3869 | buffer, conn); | |
3870 | goto transport_err; | |
3871 | } | |
3872 | ||
3873 | switch (opcode) { | |
3874 | case ISCSI_OP_SCSI_CMD: | |
3875 | if (iscsit_handle_scsi_cmd(conn, buffer) < 0) | |
3876 | goto transport_err; | |
3877 | break; | |
3878 | case ISCSI_OP_SCSI_DATA_OUT: | |
3879 | if (iscsit_handle_data_out(conn, buffer) < 0) | |
3880 | goto transport_err; | |
3881 | break; | |
3882 | case ISCSI_OP_NOOP_OUT: | |
3883 | if (iscsit_handle_nop_out(conn, buffer) < 0) | |
3884 | goto transport_err; | |
3885 | break; | |
3886 | case ISCSI_OP_SCSI_TMFUNC: | |
3887 | if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0) | |
3888 | goto transport_err; | |
3889 | break; | |
3890 | case ISCSI_OP_TEXT: | |
3891 | if (iscsit_handle_text_cmd(conn, buffer) < 0) | |
3892 | goto transport_err; | |
3893 | break; | |
3894 | case ISCSI_OP_LOGOUT: | |
3895 | ret = iscsit_handle_logout_cmd(conn, buffer); | |
3896 | if (ret > 0) { | |
3897 | wait_for_completion_timeout(&conn->conn_logout_comp, | |
3898 | SECONDS_FOR_LOGOUT_COMP * HZ); | |
3899 | goto transport_err; | |
3900 | } else if (ret < 0) | |
3901 | goto transport_err; | |
3902 | break; | |
3903 | case ISCSI_OP_SNACK: | |
3904 | if (iscsit_handle_snack(conn, buffer) < 0) | |
3905 | goto transport_err; | |
3906 | break; | |
3907 | default: | |
3908 | pr_err("Got unknown iSCSI OpCode: 0x%02x\n", | |
3909 | opcode); | |
3910 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
3911 | pr_err("Cannot recover from unknown" | |
3912 | " opcode while ERL=0, closing iSCSI connection" | |
3913 | ".\n"); | |
3914 | goto transport_err; | |
3915 | } | |
3916 | if (!conn->conn_ops->OFMarker) { | |
3917 | pr_err("Unable to recover from unknown" | |
3918 | " opcode while OFMarker=No, closing iSCSI" | |
3919 | " connection.\n"); | |
3920 | goto transport_err; | |
3921 | } | |
3922 | if (iscsit_recover_from_unknown_opcode(conn) < 0) { | |
3923 | pr_err("Unable to recover from unknown" | |
3924 | " opcode, closing iSCSI connection.\n"); | |
3925 | goto transport_err; | |
3926 | } | |
3927 | break; | |
3928 | } | |
3929 | } | |
3930 | ||
3931 | transport_err: | |
3932 | if (!signal_pending(current)) | |
3933 | atomic_set(&conn->transport_failed, 1); | |
3934 | iscsit_take_action_for_connection_exit(conn); | |
3935 | goto restart; | |
3936 | out: | |
3937 | return 0; | |
3938 | } | |
3939 | ||
3940 | static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) | |
3941 | { | |
3942 | struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; | |
3943 | struct iscsi_session *sess = conn->sess; | |
3944 | struct se_cmd *se_cmd; | |
3945 | /* | |
3946 | * We expect this function to only ever be called from either RX or TX | |
3947 | * thread context via iscsit_close_connection() once the other context | |
3948 | * has been reset -> returned sleeping pre-handler state. | |
3949 | */ | |
3950 | spin_lock_bh(&conn->cmd_lock); | |
3951 | list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) { | |
3952 | if (!(cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD)) { | |
3953 | ||
3954 | list_del(&cmd->i_list); | |
3955 | spin_unlock_bh(&conn->cmd_lock); | |
3956 | iscsit_increment_maxcmdsn(cmd, sess); | |
3957 | se_cmd = &cmd->se_cmd; | |
3958 | /* | |
3959 | * Special cases for active iSCSI TMR, and | |
3960 | * transport_lookup_cmd_lun() failing from | |
3961 | * iscsit_get_lun_for_cmd() in iscsit_handle_scsi_cmd(). | |
3962 | */ | |
3963 | if (cmd->tmr_req && se_cmd->transport_wait_for_tasks) | |
3964 | se_cmd->transport_wait_for_tasks(se_cmd, 1, 1); | |
3965 | else if (cmd->se_cmd.se_cmd_flags & SCF_SE_LUN_CMD) | |
3966 | transport_release_cmd(se_cmd); | |
3967 | else | |
3968 | iscsit_release_cmd(cmd); | |
3969 | ||
3970 | spin_lock_bh(&conn->cmd_lock); | |
3971 | continue; | |
3972 | } | |
3973 | list_del(&cmd->i_list); | |
3974 | spin_unlock_bh(&conn->cmd_lock); | |
3975 | ||
3976 | iscsit_increment_maxcmdsn(cmd, sess); | |
3977 | se_cmd = &cmd->se_cmd; | |
3978 | ||
3979 | if (se_cmd->transport_wait_for_tasks) | |
3980 | se_cmd->transport_wait_for_tasks(se_cmd, 1, 1); | |
3981 | ||
3982 | spin_lock_bh(&conn->cmd_lock); | |
3983 | } | |
3984 | spin_unlock_bh(&conn->cmd_lock); | |
3985 | } | |
3986 | ||
3987 | static void iscsit_stop_timers_for_cmds( | |
3988 | struct iscsi_conn *conn) | |
3989 | { | |
3990 | struct iscsi_cmd *cmd; | |
3991 | ||
3992 | spin_lock_bh(&conn->cmd_lock); | |
3993 | list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { | |
3994 | if (cmd->data_direction == DMA_TO_DEVICE) | |
3995 | iscsit_stop_dataout_timer(cmd); | |
3996 | } | |
3997 | spin_unlock_bh(&conn->cmd_lock); | |
3998 | } | |
3999 | ||
4000 | int iscsit_close_connection( | |
4001 | struct iscsi_conn *conn) | |
4002 | { | |
4003 | int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); | |
4004 | struct iscsi_session *sess = conn->sess; | |
4005 | ||
4006 | pr_debug("Closing iSCSI connection CID %hu on SID:" | |
4007 | " %u\n", conn->cid, sess->sid); | |
4008 | /* | |
4009 | * Always up conn_logout_comp just in case the RX Thread is sleeping | |
4010 | * and the logout response never got sent because the connection | |
4011 | * failed. | |
4012 | */ | |
4013 | complete(&conn->conn_logout_comp); | |
4014 | ||
4015 | iscsi_release_thread_set(conn); | |
4016 | ||
4017 | iscsit_stop_timers_for_cmds(conn); | |
4018 | iscsit_stop_nopin_response_timer(conn); | |
4019 | iscsit_stop_nopin_timer(conn); | |
4020 | iscsit_free_queue_reqs_for_conn(conn); | |
4021 | ||
4022 | /* | |
4023 | * During Connection recovery drop unacknowledged out of order | |
4024 | * commands for this connection, and prepare the other commands | |
4025 | * for realligence. | |
4026 | * | |
4027 | * During normal operation clear the out of order commands (but | |
4028 | * do not free the struct iscsi_ooo_cmdsn's) and release all | |
4029 | * struct iscsi_cmds. | |
4030 | */ | |
4031 | if (atomic_read(&conn->connection_recovery)) { | |
4032 | iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); | |
4033 | iscsit_prepare_cmds_for_realligance(conn); | |
4034 | } else { | |
4035 | iscsit_clear_ooo_cmdsns_for_conn(conn); | |
4036 | iscsit_release_commands_from_conn(conn); | |
4037 | } | |
4038 | ||
4039 | /* | |
4040 | * Handle decrementing session or connection usage count if | |
4041 | * a logout response was not able to be sent because the | |
4042 | * connection failed. Fall back to Session Recovery here. | |
4043 | */ | |
4044 | if (atomic_read(&conn->conn_logout_remove)) { | |
4045 | if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { | |
4046 | iscsit_dec_conn_usage_count(conn); | |
4047 | iscsit_dec_session_usage_count(sess); | |
4048 | } | |
4049 | if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) | |
4050 | iscsit_dec_conn_usage_count(conn); | |
4051 | ||
4052 | atomic_set(&conn->conn_logout_remove, 0); | |
4053 | atomic_set(&sess->session_reinstatement, 0); | |
4054 | atomic_set(&sess->session_fall_back_to_erl0, 1); | |
4055 | } | |
4056 | ||
4057 | spin_lock_bh(&sess->conn_lock); | |
4058 | list_del(&conn->conn_list); | |
4059 | ||
4060 | /* | |
4061 | * Attempt to let the Initiator know this connection failed by | |
4062 | * sending an Connection Dropped Async Message on another | |
4063 | * active connection. | |
4064 | */ | |
4065 | if (atomic_read(&conn->connection_recovery)) | |
4066 | iscsit_build_conn_drop_async_message(conn); | |
4067 | ||
4068 | spin_unlock_bh(&sess->conn_lock); | |
4069 | ||
4070 | /* | |
4071 | * If connection reinstatement is being performed on this connection, | |
4072 | * up the connection reinstatement semaphore that is being blocked on | |
4073 | * in iscsit_cause_connection_reinstatement(). | |
4074 | */ | |
4075 | spin_lock_bh(&conn->state_lock); | |
4076 | if (atomic_read(&conn->sleep_on_conn_wait_comp)) { | |
4077 | spin_unlock_bh(&conn->state_lock); | |
4078 | complete(&conn->conn_wait_comp); | |
4079 | wait_for_completion(&conn->conn_post_wait_comp); | |
4080 | spin_lock_bh(&conn->state_lock); | |
4081 | } | |
4082 | ||
4083 | /* | |
4084 | * If connection reinstatement is being performed on this connection | |
4085 | * by receiving a REMOVECONNFORRECOVERY logout request, up the | |
4086 | * connection wait rcfr semaphore that is being blocked on | |
4087 | * an iscsit_connection_reinstatement_rcfr(). | |
4088 | */ | |
4089 | if (atomic_read(&conn->connection_wait_rcfr)) { | |
4090 | spin_unlock_bh(&conn->state_lock); | |
4091 | complete(&conn->conn_wait_rcfr_comp); | |
4092 | wait_for_completion(&conn->conn_post_wait_comp); | |
4093 | spin_lock_bh(&conn->state_lock); | |
4094 | } | |
4095 | atomic_set(&conn->connection_reinstatement, 1); | |
4096 | spin_unlock_bh(&conn->state_lock); | |
4097 | ||
4098 | /* | |
4099 | * If any other processes are accessing this connection pointer we | |
4100 | * must wait until they have completed. | |
4101 | */ | |
4102 | iscsit_check_conn_usage_count(conn); | |
4103 | ||
4104 | if (conn->conn_rx_hash.tfm) | |
4105 | crypto_free_hash(conn->conn_rx_hash.tfm); | |
4106 | if (conn->conn_tx_hash.tfm) | |
4107 | crypto_free_hash(conn->conn_tx_hash.tfm); | |
4108 | ||
4109 | if (conn->conn_cpumask) | |
4110 | free_cpumask_var(conn->conn_cpumask); | |
4111 | ||
4112 | kfree(conn->conn_ops); | |
4113 | conn->conn_ops = NULL; | |
4114 | ||
4115 | if (conn->sock) { | |
4116 | if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) { | |
4117 | kfree(conn->sock->file); | |
4118 | conn->sock->file = NULL; | |
4119 | } | |
4120 | sock_release(conn->sock); | |
4121 | } | |
4122 | conn->thread_set = NULL; | |
4123 | ||
4124 | pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); | |
4125 | conn->conn_state = TARG_CONN_STATE_FREE; | |
4126 | kfree(conn); | |
4127 | ||
4128 | spin_lock_bh(&sess->conn_lock); | |
4129 | atomic_dec(&sess->nconn); | |
4130 | pr_debug("Decremented iSCSI connection count to %hu from node:" | |
4131 | " %s\n", atomic_read(&sess->nconn), | |
4132 | sess->sess_ops->InitiatorName); | |
4133 | /* | |
4134 | * Make sure that if one connection fails in an non ERL=2 iSCSI | |
4135 | * Session that they all fail. | |
4136 | */ | |
4137 | if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && | |
4138 | !atomic_read(&sess->session_logout)) | |
4139 | atomic_set(&sess->session_fall_back_to_erl0, 1); | |
4140 | ||
4141 | /* | |
4142 | * If this was not the last connection in the session, and we are | |
4143 | * performing session reinstatement or falling back to ERL=0, call | |
4144 | * iscsit_stop_session() without sleeping to shutdown the other | |
4145 | * active connections. | |
4146 | */ | |
4147 | if (atomic_read(&sess->nconn)) { | |
4148 | if (!atomic_read(&sess->session_reinstatement) && | |
4149 | !atomic_read(&sess->session_fall_back_to_erl0)) { | |
4150 | spin_unlock_bh(&sess->conn_lock); | |
4151 | return 0; | |
4152 | } | |
4153 | if (!atomic_read(&sess->session_stop_active)) { | |
4154 | atomic_set(&sess->session_stop_active, 1); | |
4155 | spin_unlock_bh(&sess->conn_lock); | |
4156 | iscsit_stop_session(sess, 0, 0); | |
4157 | return 0; | |
4158 | } | |
4159 | spin_unlock_bh(&sess->conn_lock); | |
4160 | return 0; | |
4161 | } | |
4162 | ||
4163 | /* | |
4164 | * If this was the last connection in the session and one of the | |
4165 | * following is occurring: | |
4166 | * | |
4167 | * Session Reinstatement is not being performed, and are falling back | |
4168 | * to ERL=0 call iscsit_close_session(). | |
4169 | * | |
4170 | * Session Logout was requested. iscsit_close_session() will be called | |
4171 | * elsewhere. | |
4172 | * | |
4173 | * Session Continuation is not being performed, start the Time2Retain | |
4174 | * handler and check if sleep_on_sess_wait_sem is active. | |
4175 | */ | |
4176 | if (!atomic_read(&sess->session_reinstatement) && | |
4177 | atomic_read(&sess->session_fall_back_to_erl0)) { | |
4178 | spin_unlock_bh(&sess->conn_lock); | |
4179 | iscsit_close_session(sess); | |
4180 | ||
4181 | return 0; | |
4182 | } else if (atomic_read(&sess->session_logout)) { | |
4183 | pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); | |
4184 | sess->session_state = TARG_SESS_STATE_FREE; | |
4185 | spin_unlock_bh(&sess->conn_lock); | |
4186 | ||
4187 | if (atomic_read(&sess->sleep_on_sess_wait_comp)) | |
4188 | complete(&sess->session_wait_comp); | |
4189 | ||
4190 | return 0; | |
4191 | } else { | |
4192 | pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); | |
4193 | sess->session_state = TARG_SESS_STATE_FAILED; | |
4194 | ||
4195 | if (!atomic_read(&sess->session_continuation)) { | |
4196 | spin_unlock_bh(&sess->conn_lock); | |
4197 | iscsit_start_time2retain_handler(sess); | |
4198 | } else | |
4199 | spin_unlock_bh(&sess->conn_lock); | |
4200 | ||
4201 | if (atomic_read(&sess->sleep_on_sess_wait_comp)) | |
4202 | complete(&sess->session_wait_comp); | |
4203 | ||
4204 | return 0; | |
4205 | } | |
4206 | spin_unlock_bh(&sess->conn_lock); | |
4207 | ||
4208 | return 0; | |
4209 | } | |
4210 | ||
4211 | int iscsit_close_session(struct iscsi_session *sess) | |
4212 | { | |
4213 | struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); | |
4214 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; | |
4215 | ||
4216 | if (atomic_read(&sess->nconn)) { | |
4217 | pr_err("%d connection(s) still exist for iSCSI session" | |
4218 | " to %s\n", atomic_read(&sess->nconn), | |
4219 | sess->sess_ops->InitiatorName); | |
4220 | BUG(); | |
4221 | } | |
4222 | ||
4223 | spin_lock_bh(&se_tpg->session_lock); | |
4224 | atomic_set(&sess->session_logout, 1); | |
4225 | atomic_set(&sess->session_reinstatement, 1); | |
4226 | iscsit_stop_time2retain_timer(sess); | |
4227 | spin_unlock_bh(&se_tpg->session_lock); | |
4228 | ||
4229 | /* | |
4230 | * transport_deregister_session_configfs() will clear the | |
4231 | * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context | |
4232 | * can be setting it again with __transport_register_session() in | |
4233 | * iscsi_post_login_handler() again after the iscsit_stop_session() | |
4234 | * completes in iscsi_np context. | |
4235 | */ | |
4236 | transport_deregister_session_configfs(sess->se_sess); | |
4237 | ||
4238 | /* | |
4239 | * If any other processes are accessing this session pointer we must | |
4240 | * wait until they have completed. If we are in an interrupt (the | |
4241 | * time2retain handler) and contain and active session usage count we | |
4242 | * restart the timer and exit. | |
4243 | */ | |
4244 | if (!in_interrupt()) { | |
4245 | if (iscsit_check_session_usage_count(sess) == 1) | |
4246 | iscsit_stop_session(sess, 1, 1); | |
4247 | } else { | |
4248 | if (iscsit_check_session_usage_count(sess) == 2) { | |
4249 | atomic_set(&sess->session_logout, 0); | |
4250 | iscsit_start_time2retain_handler(sess); | |
4251 | return 0; | |
4252 | } | |
4253 | } | |
4254 | ||
4255 | transport_deregister_session(sess->se_sess); | |
4256 | ||
4257 | if (sess->sess_ops->ErrorRecoveryLevel == 2) | |
4258 | iscsit_free_connection_recovery_entires(sess); | |
4259 | ||
4260 | iscsit_free_all_ooo_cmdsns(sess); | |
4261 | ||
4262 | spin_lock_bh(&se_tpg->session_lock); | |
4263 | pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); | |
4264 | sess->session_state = TARG_SESS_STATE_FREE; | |
4265 | pr_debug("Released iSCSI session from node: %s\n", | |
4266 | sess->sess_ops->InitiatorName); | |
4267 | tpg->nsessions--; | |
4268 | if (tpg->tpg_tiqn) | |
4269 | tpg->tpg_tiqn->tiqn_nsessions--; | |
4270 | ||
4271 | pr_debug("Decremented number of active iSCSI Sessions on" | |
4272 | " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); | |
4273 | ||
4274 | spin_lock(&sess_idr_lock); | |
4275 | idr_remove(&sess_idr, sess->session_index); | |
4276 | spin_unlock(&sess_idr_lock); | |
4277 | ||
4278 | kfree(sess->sess_ops); | |
4279 | sess->sess_ops = NULL; | |
4280 | spin_unlock_bh(&se_tpg->session_lock); | |
4281 | ||
4282 | kfree(sess); | |
4283 | return 0; | |
4284 | } | |
4285 | ||
4286 | static void iscsit_logout_post_handler_closesession( | |
4287 | struct iscsi_conn *conn) | |
4288 | { | |
4289 | struct iscsi_session *sess = conn->sess; | |
4290 | ||
4291 | iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); | |
4292 | iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); | |
4293 | ||
4294 | atomic_set(&conn->conn_logout_remove, 0); | |
4295 | complete(&conn->conn_logout_comp); | |
4296 | ||
4297 | iscsit_dec_conn_usage_count(conn); | |
4298 | iscsit_stop_session(sess, 1, 1); | |
4299 | iscsit_dec_session_usage_count(sess); | |
4300 | iscsit_close_session(sess); | |
4301 | } | |
4302 | ||
4303 | static void iscsit_logout_post_handler_samecid( | |
4304 | struct iscsi_conn *conn) | |
4305 | { | |
4306 | iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); | |
4307 | iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); | |
4308 | ||
4309 | atomic_set(&conn->conn_logout_remove, 0); | |
4310 | complete(&conn->conn_logout_comp); | |
4311 | ||
4312 | iscsit_cause_connection_reinstatement(conn, 1); | |
4313 | iscsit_dec_conn_usage_count(conn); | |
4314 | } | |
4315 | ||
4316 | static void iscsit_logout_post_handler_diffcid( | |
4317 | struct iscsi_conn *conn, | |
4318 | u16 cid) | |
4319 | { | |
4320 | struct iscsi_conn *l_conn; | |
4321 | struct iscsi_session *sess = conn->sess; | |
4322 | ||
4323 | if (!sess) | |
4324 | return; | |
4325 | ||
4326 | spin_lock_bh(&sess->conn_lock); | |
4327 | list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { | |
4328 | if (l_conn->cid == cid) { | |
4329 | iscsit_inc_conn_usage_count(l_conn); | |
4330 | break; | |
4331 | } | |
4332 | } | |
4333 | spin_unlock_bh(&sess->conn_lock); | |
4334 | ||
4335 | if (!l_conn) | |
4336 | return; | |
4337 | ||
4338 | if (l_conn->sock) | |
4339 | l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); | |
4340 | ||
4341 | spin_lock_bh(&l_conn->state_lock); | |
4342 | pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); | |
4343 | l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; | |
4344 | spin_unlock_bh(&l_conn->state_lock); | |
4345 | ||
4346 | iscsit_cause_connection_reinstatement(l_conn, 1); | |
4347 | iscsit_dec_conn_usage_count(l_conn); | |
4348 | } | |
4349 | ||
4350 | /* | |
4351 | * Return of 0 causes the TX thread to restart. | |
4352 | */ | |
4353 | static int iscsit_logout_post_handler( | |
4354 | struct iscsi_cmd *cmd, | |
4355 | struct iscsi_conn *conn) | |
4356 | { | |
4357 | int ret = 0; | |
4358 | ||
4359 | switch (cmd->logout_reason) { | |
4360 | case ISCSI_LOGOUT_REASON_CLOSE_SESSION: | |
4361 | switch (cmd->logout_response) { | |
4362 | case ISCSI_LOGOUT_SUCCESS: | |
4363 | case ISCSI_LOGOUT_CLEANUP_FAILED: | |
4364 | default: | |
4365 | iscsit_logout_post_handler_closesession(conn); | |
4366 | break; | |
4367 | } | |
4368 | ret = 0; | |
4369 | break; | |
4370 | case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: | |
4371 | if (conn->cid == cmd->logout_cid) { | |
4372 | switch (cmd->logout_response) { | |
4373 | case ISCSI_LOGOUT_SUCCESS: | |
4374 | case ISCSI_LOGOUT_CLEANUP_FAILED: | |
4375 | default: | |
4376 | iscsit_logout_post_handler_samecid(conn); | |
4377 | break; | |
4378 | } | |
4379 | ret = 0; | |
4380 | } else { | |
4381 | switch (cmd->logout_response) { | |
4382 | case ISCSI_LOGOUT_SUCCESS: | |
4383 | iscsit_logout_post_handler_diffcid(conn, | |
4384 | cmd->logout_cid); | |
4385 | break; | |
4386 | case ISCSI_LOGOUT_CID_NOT_FOUND: | |
4387 | case ISCSI_LOGOUT_CLEANUP_FAILED: | |
4388 | default: | |
4389 | break; | |
4390 | } | |
4391 | ret = 1; | |
4392 | } | |
4393 | break; | |
4394 | case ISCSI_LOGOUT_REASON_RECOVERY: | |
4395 | switch (cmd->logout_response) { | |
4396 | case ISCSI_LOGOUT_SUCCESS: | |
4397 | case ISCSI_LOGOUT_CID_NOT_FOUND: | |
4398 | case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: | |
4399 | case ISCSI_LOGOUT_CLEANUP_FAILED: | |
4400 | default: | |
4401 | break; | |
4402 | } | |
4403 | ret = 1; | |
4404 | break; | |
4405 | default: | |
4406 | break; | |
4407 | ||
4408 | } | |
4409 | return ret; | |
4410 | } | |
4411 | ||
4412 | void iscsit_fail_session(struct iscsi_session *sess) | |
4413 | { | |
4414 | struct iscsi_conn *conn; | |
4415 | ||
4416 | spin_lock_bh(&sess->conn_lock); | |
4417 | list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { | |
4418 | pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); | |
4419 | conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; | |
4420 | } | |
4421 | spin_unlock_bh(&sess->conn_lock); | |
4422 | ||
4423 | pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); | |
4424 | sess->session_state = TARG_SESS_STATE_FAILED; | |
4425 | } | |
4426 | ||
4427 | int iscsit_free_session(struct iscsi_session *sess) | |
4428 | { | |
4429 | u16 conn_count = atomic_read(&sess->nconn); | |
4430 | struct iscsi_conn *conn, *conn_tmp = NULL; | |
4431 | int is_last; | |
4432 | ||
4433 | spin_lock_bh(&sess->conn_lock); | |
4434 | atomic_set(&sess->sleep_on_sess_wait_comp, 1); | |
4435 | ||
4436 | list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, | |
4437 | conn_list) { | |
4438 | if (conn_count == 0) | |
4439 | break; | |
4440 | ||
4441 | if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { | |
4442 | is_last = 1; | |
4443 | } else { | |
4444 | iscsit_inc_conn_usage_count(conn_tmp); | |
4445 | is_last = 0; | |
4446 | } | |
4447 | iscsit_inc_conn_usage_count(conn); | |
4448 | ||
4449 | spin_unlock_bh(&sess->conn_lock); | |
4450 | iscsit_cause_connection_reinstatement(conn, 1); | |
4451 | spin_lock_bh(&sess->conn_lock); | |
4452 | ||
4453 | iscsit_dec_conn_usage_count(conn); | |
4454 | if (is_last == 0) | |
4455 | iscsit_dec_conn_usage_count(conn_tmp); | |
4456 | ||
4457 | conn_count--; | |
4458 | } | |
4459 | ||
4460 | if (atomic_read(&sess->nconn)) { | |
4461 | spin_unlock_bh(&sess->conn_lock); | |
4462 | wait_for_completion(&sess->session_wait_comp); | |
4463 | } else | |
4464 | spin_unlock_bh(&sess->conn_lock); | |
4465 | ||
4466 | iscsit_close_session(sess); | |
4467 | return 0; | |
4468 | } | |
4469 | ||
4470 | void iscsit_stop_session( | |
4471 | struct iscsi_session *sess, | |
4472 | int session_sleep, | |
4473 | int connection_sleep) | |
4474 | { | |
4475 | u16 conn_count = atomic_read(&sess->nconn); | |
4476 | struct iscsi_conn *conn, *conn_tmp = NULL; | |
4477 | int is_last; | |
4478 | ||
4479 | spin_lock_bh(&sess->conn_lock); | |
4480 | if (session_sleep) | |
4481 | atomic_set(&sess->sleep_on_sess_wait_comp, 1); | |
4482 | ||
4483 | if (connection_sleep) { | |
4484 | list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, | |
4485 | conn_list) { | |
4486 | if (conn_count == 0) | |
4487 | break; | |
4488 | ||
4489 | if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { | |
4490 | is_last = 1; | |
4491 | } else { | |
4492 | iscsit_inc_conn_usage_count(conn_tmp); | |
4493 | is_last = 0; | |
4494 | } | |
4495 | iscsit_inc_conn_usage_count(conn); | |
4496 | ||
4497 | spin_unlock_bh(&sess->conn_lock); | |
4498 | iscsit_cause_connection_reinstatement(conn, 1); | |
4499 | spin_lock_bh(&sess->conn_lock); | |
4500 | ||
4501 | iscsit_dec_conn_usage_count(conn); | |
4502 | if (is_last == 0) | |
4503 | iscsit_dec_conn_usage_count(conn_tmp); | |
4504 | conn_count--; | |
4505 | } | |
4506 | } else { | |
4507 | list_for_each_entry(conn, &sess->sess_conn_list, conn_list) | |
4508 | iscsit_cause_connection_reinstatement(conn, 0); | |
4509 | } | |
4510 | ||
4511 | if (session_sleep && atomic_read(&sess->nconn)) { | |
4512 | spin_unlock_bh(&sess->conn_lock); | |
4513 | wait_for_completion(&sess->session_wait_comp); | |
4514 | } else | |
4515 | spin_unlock_bh(&sess->conn_lock); | |
4516 | } | |
4517 | ||
4518 | int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) | |
4519 | { | |
4520 | struct iscsi_session *sess; | |
4521 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; | |
4522 | struct se_session *se_sess, *se_sess_tmp; | |
4523 | int session_count = 0; | |
4524 | ||
4525 | spin_lock_bh(&se_tpg->session_lock); | |
4526 | if (tpg->nsessions && !force) { | |
4527 | spin_unlock_bh(&se_tpg->session_lock); | |
4528 | return -1; | |
4529 | } | |
4530 | ||
4531 | list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, | |
4532 | sess_list) { | |
4533 | sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; | |
4534 | ||
4535 | spin_lock(&sess->conn_lock); | |
4536 | if (atomic_read(&sess->session_fall_back_to_erl0) || | |
4537 | atomic_read(&sess->session_logout) || | |
4538 | (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { | |
4539 | spin_unlock(&sess->conn_lock); | |
4540 | continue; | |
4541 | } | |
4542 | atomic_set(&sess->session_reinstatement, 1); | |
4543 | spin_unlock(&sess->conn_lock); | |
4544 | spin_unlock_bh(&se_tpg->session_lock); | |
4545 | ||
4546 | iscsit_free_session(sess); | |
4547 | spin_lock_bh(&se_tpg->session_lock); | |
4548 | ||
4549 | session_count++; | |
4550 | } | |
4551 | spin_unlock_bh(&se_tpg->session_lock); | |
4552 | ||
4553 | pr_debug("Released %d iSCSI Session(s) from Target Portal" | |
4554 | " Group: %hu\n", session_count, tpg->tpgt); | |
4555 | return 0; | |
4556 | } | |
4557 | ||
4558 | MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); | |
4559 | MODULE_VERSION("4.1.x"); | |
4560 | MODULE_AUTHOR("nab@Linux-iSCSI.org"); | |
4561 | MODULE_LICENSE("GPL"); | |
4562 | ||
4563 | module_init(iscsi_target_init_module); | |
4564 | module_exit(iscsi_target_cleanup_module); |