?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Adding support for MOXA ART SoC. Testing port of linux-2.6.32.60-moxart.
[linux-3.6.7-moxart.git] / drivers / target / sbp / sbp_target.c
blob39ddba584b30e9d08950bd3143c257da20c80b55
1 /*
2 * SBP2 target driver (SCSI over IEEE1394 in target mode)
3 *
4 * Copyright (C) 2011 Chris Boot <bootc@bootc.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21 #define KMSG_COMPONENT "sbp_target"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/string.h>
29 #include <linux/configfs.h>
30 #include <linux/ctype.h>
31 #include <linux/firewire.h>
32 #include <linux/firewire-constants.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_tcq.h>
35 #include <target/target_core_base.h>
36 #include <target/target_core_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_fabric_configfs.h>
39 #include <target/target_core_configfs.h>
40 #include <target/configfs_macros.h>
41 #include <asm/unaligned.h>
42
43 #include "sbp_target.h"
44
45 /* Local pointer to allocated TCM configfs fabric module */
46 static struct target_fabric_configfs *sbp_fabric_configfs;
47
48 /* FireWire address region for management and command block address handlers */
49 static const struct fw_address_region sbp_register_region = {
50 .start = CSR_REGISTER_BASE + 0x10000,
51 .end = 0x1000000000000ULL,
52 };
53
54 static const u32 sbp_unit_directory_template[] = {
55 0x1200609e, /* unit_specifier_id: NCITS/T10 */
56 0x13010483, /* unit_sw_version: 1155D Rev 4 */
57 0x3800609e, /* command_set_specifier_id: NCITS/T10 */
58 0x390104d8, /* command_set: SPC-2 */
59 0x3b000000, /* command_set_revision: 0 */
60 0x3c000001, /* firmware_revision: 1 */
61 };
62
63 #define SESSION_MAINTENANCE_INTERVAL HZ
64
65 static atomic_t login_id = ATOMIC_INIT(0);
66
67 static void session_maintenance_work(struct work_struct *);
68 static int sbp_run_transaction(struct fw_card *, int, int, int, int,
69 unsigned long long, void *, size_t);
70
71 static int read_peer_guid(u64 *guid, const struct sbp_management_request *req)
72 {
73 int ret;
74 __be32 high, low;
75
76 ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
77 req->node_addr, req->generation, req->speed,
78 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 3 * 4,
79 &high, sizeof(high));
80 if (ret != RCODE_COMPLETE)
81 return ret;
82
83 ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
84 req->node_addr, req->generation, req->speed,
85 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 4 * 4,
86 &low, sizeof(low));
87 if (ret != RCODE_COMPLETE)
88 return ret;
89
90 *guid = (u64)be32_to_cpu(high) << 32 | be32_to_cpu(low);
91
92 return RCODE_COMPLETE;
93 }
94
95 static struct sbp_session *sbp_session_find_by_guid(
96 struct sbp_tpg *tpg, u64 guid)
97 {
98 struct se_session *se_sess;
99 struct sbp_session *sess, *found = NULL;
100
101 spin_lock_bh(&tpg->se_tpg.session_lock);
102 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
103 sess = se_sess->fabric_sess_ptr;
104 if (sess->guid == guid)
105 found = sess;
106 }
107 spin_unlock_bh(&tpg->se_tpg.session_lock);
108
109 return found;
110 }
111
112 static struct sbp_login_descriptor *sbp_login_find_by_lun(
113 struct sbp_session *session, struct se_lun *lun)
114 {
115 struct sbp_login_descriptor *login, *found = NULL;
116
117 spin_lock_bh(&session->lock);
118 list_for_each_entry(login, &session->login_list, link) {
119 if (login->lun == lun)
120 found = login;
121 }
122 spin_unlock_bh(&session->lock);
123
124 return found;
125 }
126
127 static int sbp_login_count_all_by_lun(
128 struct sbp_tpg *tpg,
129 struct se_lun *lun,
130 int exclusive)
131 {
132 struct se_session *se_sess;
133 struct sbp_session *sess;
134 struct sbp_login_descriptor *login;
135 int count = 0;
136
137 spin_lock_bh(&tpg->se_tpg.session_lock);
138 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
139 sess = se_sess->fabric_sess_ptr;
140
141 spin_lock_bh(&sess->lock);
142 list_for_each_entry(login, &sess->login_list, link) {
143 if (login->lun != lun)
144 continue;
145
146 if (!exclusive || login->exclusive)
147 count++;
148 }
149 spin_unlock_bh(&sess->lock);
150 }
151 spin_unlock_bh(&tpg->se_tpg.session_lock);
152
153 return count;
154 }
155
156 static struct sbp_login_descriptor *sbp_login_find_by_id(
157 struct sbp_tpg *tpg, int login_id)
158 {
159 struct se_session *se_sess;
160 struct sbp_session *sess;
161 struct sbp_login_descriptor *login, *found = NULL;
162
163 spin_lock_bh(&tpg->se_tpg.session_lock);
164 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
165 sess = se_sess->fabric_sess_ptr;
166
167 spin_lock_bh(&sess->lock);
168 list_for_each_entry(login, &sess->login_list, link) {
169 if (login->login_id == login_id)
170 found = login;
171 }
172 spin_unlock_bh(&sess->lock);
173 }
174 spin_unlock_bh(&tpg->se_tpg.session_lock);
175
176 return found;
177 }
178
179 static struct se_lun *sbp_get_lun_from_tpg(struct sbp_tpg *tpg, int lun)
180 {
181 struct se_portal_group *se_tpg = &tpg->se_tpg;
182 struct se_lun *se_lun;
183
184 if (lun >= TRANSPORT_MAX_LUNS_PER_TPG)
185 return ERR_PTR(-EINVAL);
186
187 spin_lock(&se_tpg->tpg_lun_lock);
188 se_lun = se_tpg->tpg_lun_list[lun];
189
190 if (se_lun->lun_status != TRANSPORT_LUN_STATUS_ACTIVE)
191 se_lun = ERR_PTR(-ENODEV);
192
193 spin_unlock(&se_tpg->tpg_lun_lock);
194
195 return se_lun;
196 }
197
198 static struct sbp_session *sbp_session_create(
199 struct sbp_tpg *tpg,
200 u64 guid)
201 {
202 struct sbp_session *sess;
203 int ret;
204 char guid_str[17];
205 struct se_node_acl *se_nacl;
206
207 sess = kmalloc(sizeof(*sess), GFP_KERNEL);
208 if (!sess) {
209 pr_err("failed to allocate session descriptor\n");
210 return ERR_PTR(-ENOMEM);
211 }
212
213 sess->se_sess = transport_init_session();
214 if (IS_ERR(sess->se_sess)) {
215 pr_err("failed to init se_session\n");
216
217 ret = PTR_ERR(sess->se_sess);
218 kfree(sess);
219 return ERR_PTR(ret);
220 }
221
222 snprintf(guid_str, sizeof(guid_str), "%016llx", guid);
223
224 se_nacl = core_tpg_check_initiator_node_acl(&tpg->se_tpg, guid_str);
225 if (!se_nacl) {
226 pr_warn("Node ACL not found for %s\n", guid_str);
227
228 transport_free_session(sess->se_sess);
229 kfree(sess);
230
231 return ERR_PTR(-EPERM);
232 }
233
234 sess->se_sess->se_node_acl = se_nacl;
235
236 spin_lock_init(&sess->lock);
237 INIT_LIST_HEAD(&sess->login_list);
238 INIT_DELAYED_WORK(&sess->maint_work, session_maintenance_work);
239
240 sess->guid = guid;
241
242 transport_register_session(&tpg->se_tpg, se_nacl, sess->se_sess, sess);
243
244 return sess;
245 }
246
247 static void sbp_session_release(struct sbp_session *sess, bool cancel_work)
248 {
249 spin_lock_bh(&sess->lock);
250 if (!list_empty(&sess->login_list)) {
251 spin_unlock_bh(&sess->lock);
252 return;
253 }
254 spin_unlock_bh(&sess->lock);
255
256 if (cancel_work)
257 cancel_delayed_work_sync(&sess->maint_work);
258
259 transport_deregister_session_configfs(sess->se_sess);
260 transport_deregister_session(sess->se_sess);
261
262 if (sess->card)
263 fw_card_put(sess->card);
264
265 kfree(sess);
266 }
267
268 static void sbp_target_agent_unregister(struct sbp_target_agent *);
269
270 static void sbp_login_release(struct sbp_login_descriptor *login,
271 bool cancel_work)
272 {
273 struct sbp_session *sess = login->sess;
274
275 /* FIXME: abort/wait on tasks */
276
277 sbp_target_agent_unregister(login->tgt_agt);
278
279 if (sess) {
280 spin_lock_bh(&sess->lock);
281 list_del(&login->link);
282 spin_unlock_bh(&sess->lock);
283
284 sbp_session_release(sess, cancel_work);
285 }
286
287 kfree(login);
288 }
289
290 static struct sbp_target_agent *sbp_target_agent_register(
291 struct sbp_login_descriptor *);
292
293 static void sbp_management_request_login(
294 struct sbp_management_agent *agent, struct sbp_management_request *req,
295 int *status_data_size)
296 {
297 struct sbp_tport *tport = agent->tport;
298 struct sbp_tpg *tpg = tport->tpg;
299 struct se_lun *se_lun;
300 int ret;
301 u64 guid;
302 struct sbp_session *sess;
303 struct sbp_login_descriptor *login;
304 struct sbp_login_response_block *response;
305 int login_response_len;
306
307 se_lun = sbp_get_lun_from_tpg(tpg,
308 LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
309 if (IS_ERR(se_lun)) {
310 pr_notice("login to unknown LUN: %d\n",
311 LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
312
313 req->status.status = cpu_to_be32(
314 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
315 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LUN_NOTSUPP));
316 return;
317 }
318
319 ret = read_peer_guid(&guid, req);
320 if (ret != RCODE_COMPLETE) {
321 pr_warn("failed to read peer GUID: %d\n", ret);
322
323 req->status.status = cpu_to_be32(
324 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
325 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
326 return;
327 }
328
329 pr_notice("mgt_agent LOGIN to LUN %d from %016llx\n",
330 se_lun->unpacked_lun, guid);
331
332 sess = sbp_session_find_by_guid(tpg, guid);
333 if (sess) {
334 login = sbp_login_find_by_lun(sess, se_lun);
335 if (login) {
336 pr_notice("initiator already logged-in\n");
337
338 /*
339 * SBP-2 R4 says we should return access denied, but
340 * that can confuse initiators. Instead we need to
341 * treat this like a reconnect, but send the login
342 * response block like a fresh login.
343 *
344 * This is required particularly in the case of Apple
345 * devices booting off the FireWire target, where
346 * the firmware has an active login to the target. When
347 * the OS takes control of the session it issues its own
348 * LOGIN rather than a RECONNECT. To avoid the machine
349 * waiting until the reconnect_hold expires, we can skip
350 * the ACCESS_DENIED errors to speed things up.
351 */
352
353 goto already_logged_in;
354 }
355 }
356
357 /*
358 * check exclusive bit in login request
359 * reject with access_denied if any logins present
360 */
361 if (LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)) &&
362 sbp_login_count_all_by_lun(tpg, se_lun, 0)) {
363 pr_warn("refusing exclusive login with other active logins\n");
364
365 req->status.status = cpu_to_be32(
366 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
367 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
368 return;
369 }
370
371 /*
372 * check exclusive bit in any existing login descriptor
373 * reject with access_denied if any exclusive logins present
374 */
375 if (sbp_login_count_all_by_lun(tpg, se_lun, 1)) {
376 pr_warn("refusing login while another exclusive login present\n");
377
378 req->status.status = cpu_to_be32(
379 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
380 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
381 return;
382 }
383
384 /*
385 * check we haven't exceeded the number of allowed logins
386 * reject with resources_unavailable if we have
387 */
388 if (sbp_login_count_all_by_lun(tpg, se_lun, 0) >=
389 tport->max_logins_per_lun) {
390 pr_warn("max number of logins reached\n");
391
392 req->status.status = cpu_to_be32(
393 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
394 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
395 return;
396 }
397
398 if (!sess) {
399 sess = sbp_session_create(tpg, guid);
400 if (IS_ERR(sess)) {
401 switch (PTR_ERR(sess)) {
402 case -EPERM:
403 ret = SBP_STATUS_ACCESS_DENIED;
404 break;
405 default:
406 ret = SBP_STATUS_RESOURCES_UNAVAIL;
407 break;
408 }
409
410 req->status.status = cpu_to_be32(
411 STATUS_BLOCK_RESP(
412 STATUS_RESP_REQUEST_COMPLETE) |
413 STATUS_BLOCK_SBP_STATUS(ret));
414 return;
415 }
416
417 sess->node_id = req->node_addr;
418 sess->card = fw_card_get(req->card);
419 sess->generation = req->generation;
420 sess->speed = req->speed;
421
422 schedule_delayed_work(&sess->maint_work,
423 SESSION_MAINTENANCE_INTERVAL);
424 }
425
426 /* only take the latest reconnect_hold into account */
427 sess->reconnect_hold = min(
428 1 << LOGIN_ORB_RECONNECT(be32_to_cpu(req->orb.misc)),
429 tport->max_reconnect_timeout) - 1;
430
431 login = kmalloc(sizeof(*login), GFP_KERNEL);
432 if (!login) {
433 pr_err("failed to allocate login descriptor\n");
434
435 sbp_session_release(sess, true);
436
437 req->status.status = cpu_to_be32(
438 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
439 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
440 return;
441 }
442
443 login->sess = sess;
444 login->lun = se_lun;
445 login->status_fifo_addr = sbp2_pointer_to_addr(&req->orb.status_fifo);
446 login->exclusive = LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc));
447 login->login_id = atomic_inc_return(&login_id);
448
449 login->tgt_agt = sbp_target_agent_register(login);
450 if (IS_ERR(login->tgt_agt)) {
451 ret = PTR_ERR(login->tgt_agt);
452 pr_err("failed to map command block handler: %d\n", ret);
453
454 sbp_session_release(sess, true);
455 kfree(login);
456
457 req->status.status = cpu_to_be32(
458 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
459 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
460 return;
461 }
462
463 spin_lock_bh(&sess->lock);
464 list_add_tail(&login->link, &sess->login_list);
465 spin_unlock_bh(&sess->lock);
466
467 already_logged_in:
468 response = kzalloc(sizeof(*response), GFP_KERNEL);
469 if (!response) {
470 pr_err("failed to allocate login response block\n");
471
472 sbp_login_release(login, true);
473
474 req->status.status = cpu_to_be32(
475 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
476 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
477 return;
478 }
479
480 login_response_len = clamp_val(
481 LOGIN_ORB_RESPONSE_LENGTH(be32_to_cpu(req->orb.length)),
482 12, sizeof(*response));
483 response->misc = cpu_to_be32(
484 ((login_response_len & 0xffff) << 16) |
485 (login->login_id & 0xffff));
486 response->reconnect_hold = cpu_to_be32(sess->reconnect_hold & 0xffff);
487 addr_to_sbp2_pointer(login->tgt_agt->handler.offset,
488 &response->command_block_agent);
489
490 ret = sbp_run_transaction(sess->card, TCODE_WRITE_BLOCK_REQUEST,
491 sess->node_id, sess->generation, sess->speed,
492 sbp2_pointer_to_addr(&req->orb.ptr2), response,
493 login_response_len);
494 if (ret != RCODE_COMPLETE) {
495 pr_debug("failed to write login response block: %x\n", ret);
496
497 kfree(response);
498 sbp_login_release(login, true);
499
500 req->status.status = cpu_to_be32(
501 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
502 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
503 return;
504 }
505
506 kfree(response);
507
508 req->status.status = cpu_to_be32(
509 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
510 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
511 }
512
513 static void sbp_management_request_query_logins(
514 struct sbp_management_agent *agent, struct sbp_management_request *req,
515 int *status_data_size)
516 {
517 pr_notice("QUERY LOGINS not implemented\n");
518 /* FIXME: implement */
519
520 req->status.status = cpu_to_be32(
521 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
522 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
523 }
524
525 static void sbp_management_request_reconnect(
526 struct sbp_management_agent *agent, struct sbp_management_request *req,
527 int *status_data_size)
528 {
529 struct sbp_tport *tport = agent->tport;
530 struct sbp_tpg *tpg = tport->tpg;
531 int ret;
532 u64 guid;
533 struct sbp_login_descriptor *login;
534
535 ret = read_peer_guid(&guid, req);
536 if (ret != RCODE_COMPLETE) {
537 pr_warn("failed to read peer GUID: %d\n", ret);
538
539 req->status.status = cpu_to_be32(
540 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
541 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
542 return;
543 }
544
545 pr_notice("mgt_agent RECONNECT from %016llx\n", guid);
546
547 login = sbp_login_find_by_id(tpg,
548 RECONNECT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc)));
549
550 if (!login) {
551 pr_err("mgt_agent RECONNECT unknown login ID\n");
552
553 req->status.status = cpu_to_be32(
554 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
555 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
556 return;
557 }
558
559 if (login->sess->guid != guid) {
560 pr_err("mgt_agent RECONNECT login GUID doesn't match\n");
561
562 req->status.status = cpu_to_be32(
563 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
564 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
565 return;
566 }
567
568 spin_lock_bh(&login->sess->lock);
569 if (login->sess->card)
570 fw_card_put(login->sess->card);
571
572 /* update the node details */
573 login->sess->generation = req->generation;
574 login->sess->node_id = req->node_addr;
575 login->sess->card = fw_card_get(req->card);
576 login->sess->speed = req->speed;
577 spin_unlock_bh(&login->sess->lock);
578
579 req->status.status = cpu_to_be32(
580 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
581 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
582 }
583
584 static void sbp_management_request_logout(
585 struct sbp_management_agent *agent, struct sbp_management_request *req,
586 int *status_data_size)
587 {
588 struct sbp_tport *tport = agent->tport;
589 struct sbp_tpg *tpg = tport->tpg;
590 int id;
591 struct sbp_login_descriptor *login;
592
593 id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc));
594
595 login = sbp_login_find_by_id(tpg, id);
596 if (!login) {
597 pr_warn("cannot find login: %d\n", id);
598
599 req->status.status = cpu_to_be32(
600 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
601 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LOGIN_ID_UNKNOWN));
602 return;
603 }
604
605 pr_info("mgt_agent LOGOUT from LUN %d session %d\n",
606 login->lun->unpacked_lun, login->login_id);
607
608 if (req->node_addr != login->sess->node_id) {
609 pr_warn("logout from different node ID\n");
610
611 req->status.status = cpu_to_be32(
612 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
613 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
614 return;
615 }
616
617 sbp_login_release(login, true);
618
619 req->status.status = cpu_to_be32(
620 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
621 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
622 }
623
624 static void session_check_for_reset(struct sbp_session *sess)
625 {
626 bool card_valid = false;
627
628 spin_lock_bh(&sess->lock);
629
630 if (sess->card) {
631 spin_lock_irq(&sess->card->lock);
632 card_valid = (sess->card->local_node != NULL);
633 spin_unlock_irq(&sess->card->lock);
634
635 if (!card_valid) {
636 fw_card_put(sess->card);
637 sess->card = NULL;
638 }
639 }
640
641 if (!card_valid || (sess->generation != sess->card->generation)) {
642 pr_info("Waiting for reconnect from node: %016llx\n",
643 sess->guid);
644
645 sess->node_id = -1;
646 sess->reconnect_expires = get_jiffies_64() +
647 ((sess->reconnect_hold + 1) * HZ);
648 }
649
650 spin_unlock_bh(&sess->lock);
651 }
652
653 static void session_reconnect_expired(struct sbp_session *sess)
654 {
655 struct sbp_login_descriptor *login, *temp;
656 LIST_HEAD(login_list);
657
658 pr_info("Reconnect timer expired for node: %016llx\n", sess->guid);
659
660 spin_lock_bh(&sess->lock);
661 list_for_each_entry_safe(login, temp, &sess->login_list, link) {
662 login->sess = NULL;
663 list_del(&login->link);
664 list_add_tail(&login->link, &login_list);
665 }
666 spin_unlock_bh(&sess->lock);
667
668 list_for_each_entry_safe(login, temp, &login_list, link) {
669 list_del(&login->link);
670 sbp_login_release(login, false);
671 }
672
673 sbp_session_release(sess, false);
674 }
675
676 static void session_maintenance_work(struct work_struct *work)
677 {
678 struct sbp_session *sess = container_of(work, struct sbp_session,
679 maint_work.work);
680
681 /* could be called while tearing down the session */
682 spin_lock_bh(&sess->lock);
683 if (list_empty(&sess->login_list)) {
684 spin_unlock_bh(&sess->lock);
685 return;
686 }
687 spin_unlock_bh(&sess->lock);
688
689 if (sess->node_id != -1) {
690 /* check for bus reset and make node_id invalid */
691 session_check_for_reset(sess);
692
693 schedule_delayed_work(&sess->maint_work,
694 SESSION_MAINTENANCE_INTERVAL);
695 } else if (!time_after64(get_jiffies_64(), sess->reconnect_expires)) {
696 /* still waiting for reconnect */
697 schedule_delayed_work(&sess->maint_work,
698 SESSION_MAINTENANCE_INTERVAL);
699 } else {
700 /* reconnect timeout has expired */
701 session_reconnect_expired(sess);
702 }
703 }
704
705 static int tgt_agent_rw_agent_state(struct fw_card *card, int tcode, void *data,
706 struct sbp_target_agent *agent)
707 {
708 __be32 state;
709
710 switch (tcode) {
711 case TCODE_READ_QUADLET_REQUEST:
712 pr_debug("tgt_agent AGENT_STATE READ\n");
713
714 spin_lock_bh(&agent->lock);
715 state = cpu_to_be32(agent->state);
716 spin_unlock_bh(&agent->lock);
717 memcpy(data, &state, sizeof(state));
718
719 return RCODE_COMPLETE;
720
721 case TCODE_WRITE_QUADLET_REQUEST:
722 /* ignored */
723 return RCODE_COMPLETE;
724
725 default:
726 return RCODE_TYPE_ERROR;
727 }
728 }
729
730 static int tgt_agent_rw_agent_reset(struct fw_card *card, int tcode, void *data,
731 struct sbp_target_agent *agent)
732 {
733 switch (tcode) {
734 case TCODE_WRITE_QUADLET_REQUEST:
735 pr_debug("tgt_agent AGENT_RESET\n");
736 spin_lock_bh(&agent->lock);
737 agent->state = AGENT_STATE_RESET;
738 spin_unlock_bh(&agent->lock);
739 return RCODE_COMPLETE;
740
741 default:
742 return RCODE_TYPE_ERROR;
743 }
744 }
745
746 static int tgt_agent_rw_orb_pointer(struct fw_card *card, int tcode, void *data,
747 struct sbp_target_agent *agent)
748 {
749 struct sbp2_pointer *ptr = data;
750
751 switch (tcode) {
752 case TCODE_WRITE_BLOCK_REQUEST:
753 spin_lock_bh(&agent->lock);
754 if (agent->state != AGENT_STATE_SUSPENDED &&
755 agent->state != AGENT_STATE_RESET) {
756 spin_unlock_bh(&agent->lock);
757 pr_notice("Ignoring ORB_POINTER write while active.\n");
758 return RCODE_CONFLICT_ERROR;
759 }
760 agent->state = AGENT_STATE_ACTIVE;
761 spin_unlock_bh(&agent->lock);
762
763 agent->orb_pointer = sbp2_pointer_to_addr(ptr);
764 agent->doorbell = false;
765
766 pr_debug("tgt_agent ORB_POINTER write: 0x%llx\n",
767 agent->orb_pointer);
768
769 queue_work(system_unbound_wq, &agent->work);
770
771 return RCODE_COMPLETE;
772
773 case TCODE_READ_BLOCK_REQUEST:
774 pr_debug("tgt_agent ORB_POINTER READ\n");
775 spin_lock_bh(&agent->lock);
776 addr_to_sbp2_pointer(agent->orb_pointer, ptr);
777 spin_unlock_bh(&agent->lock);
778 return RCODE_COMPLETE;
779
780 default:
781 return RCODE_TYPE_ERROR;
782 }
783 }
784
785 static int tgt_agent_rw_doorbell(struct fw_card *card, int tcode, void *data,
786 struct sbp_target_agent *agent)
787 {
788 switch (tcode) {
789 case TCODE_WRITE_QUADLET_REQUEST:
790 spin_lock_bh(&agent->lock);
791 if (agent->state != AGENT_STATE_SUSPENDED) {
792 spin_unlock_bh(&agent->lock);
793 pr_debug("Ignoring DOORBELL while active.\n");
794 return RCODE_CONFLICT_ERROR;
795 }
796 agent->state = AGENT_STATE_ACTIVE;
797 spin_unlock_bh(&agent->lock);
798
799 agent->doorbell = true;
800
801 pr_debug("tgt_agent DOORBELL\n");
802
803 queue_work(system_unbound_wq, &agent->work);
804
805 return RCODE_COMPLETE;
806
807 case TCODE_READ_QUADLET_REQUEST:
808 return RCODE_COMPLETE;
809
810 default:
811 return RCODE_TYPE_ERROR;
812 }
813 }
814
815 static int tgt_agent_rw_unsolicited_status_enable(struct fw_card *card,
816 int tcode, void *data, struct sbp_target_agent *agent)
817 {
818 switch (tcode) {
819 case TCODE_WRITE_QUADLET_REQUEST:
820 pr_debug("tgt_agent UNSOLICITED_STATUS_ENABLE\n");
821 /* ignored as we don't send unsolicited status */
822 return RCODE_COMPLETE;
823
824 case TCODE_READ_QUADLET_REQUEST:
825 return RCODE_COMPLETE;
826
827 default:
828 return RCODE_TYPE_ERROR;
829 }
830 }
831
832 static void tgt_agent_rw(struct fw_card *card, struct fw_request *request,
833 int tcode, int destination, int source, int generation,
834 unsigned long long offset, void *data, size_t length,
835 void *callback_data)
836 {
837 struct sbp_target_agent *agent = callback_data;
838 struct sbp_session *sess = agent->login->sess;
839 int sess_gen, sess_node, rcode;
840
841 spin_lock_bh(&sess->lock);
842 sess_gen = sess->generation;
843 sess_node = sess->node_id;
844 spin_unlock_bh(&sess->lock);
845
846 if (generation != sess_gen) {
847 pr_notice("ignoring request with wrong generation\n");
848 rcode = RCODE_TYPE_ERROR;
849 goto out;
850 }
851
852 if (source != sess_node) {
853 pr_notice("ignoring request from foreign node (%x != %x)\n",
854 source, sess_node);
855 rcode = RCODE_TYPE_ERROR;
856 goto out;
857 }
858
859 /* turn offset into the offset from the start of the block */
860 offset -= agent->handler.offset;
861
862 if (offset == 0x00 && length == 4) {
863 /* AGENT_STATE */
864 rcode = tgt_agent_rw_agent_state(card, tcode, data, agent);
865 } else if (offset == 0x04 && length == 4) {
866 /* AGENT_RESET */
867 rcode = tgt_agent_rw_agent_reset(card, tcode, data, agent);
868 } else if (offset == 0x08 && length == 8) {
869 /* ORB_POINTER */
870 rcode = tgt_agent_rw_orb_pointer(card, tcode, data, agent);
871 } else if (offset == 0x10 && length == 4) {
872 /* DOORBELL */
873 rcode = tgt_agent_rw_doorbell(card, tcode, data, agent);
874 } else if (offset == 0x14 && length == 4) {
875 /* UNSOLICITED_STATUS_ENABLE */
876 rcode = tgt_agent_rw_unsolicited_status_enable(card, tcode,
877 data, agent);
878 } else {
879 rcode = RCODE_ADDRESS_ERROR;
880 }
881
882 out:
883 fw_send_response(card, request, rcode);
884 }
885
886 static void sbp_handle_command(struct sbp_target_request *);
887 static int sbp_send_status(struct sbp_target_request *);
888 static void sbp_free_request(struct sbp_target_request *);
889
890 static void tgt_agent_process_work(struct work_struct *work)
891 {
892 struct sbp_target_request *req =
893 container_of(work, struct sbp_target_request, work);
894
895 pr_debug("tgt_orb ptr:0x%llx next_ORB:0x%llx data_descriptor:0x%llx misc:0x%x\n",
896 req->orb_pointer,
897 sbp2_pointer_to_addr(&req->orb.next_orb),
898 sbp2_pointer_to_addr(&req->orb.data_descriptor),
899 be32_to_cpu(req->orb.misc));
900
901 if (req->orb_pointer >> 32)
902 pr_debug("ORB with high bits set\n");
903
904 switch (ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc))) {
905 case 0:/* Format specified by this standard */
906 sbp_handle_command(req);
907 return;
908 case 1: /* Reserved for future standardization */
909 case 2: /* Vendor-dependent */
910 req->status.status |= cpu_to_be32(
911 STATUS_BLOCK_RESP(
912 STATUS_RESP_REQUEST_COMPLETE) |
913 STATUS_BLOCK_DEAD(0) |
914 STATUS_BLOCK_LEN(1) |
915 STATUS_BLOCK_SBP_STATUS(
916 SBP_STATUS_REQ_TYPE_NOTSUPP));
917 sbp_send_status(req);
918 sbp_free_request(req);
919 return;
920 case 3: /* Dummy ORB */
921 req->status.status |= cpu_to_be32(
922 STATUS_BLOCK_RESP(
923 STATUS_RESP_REQUEST_COMPLETE) |
924 STATUS_BLOCK_DEAD(0) |
925 STATUS_BLOCK_LEN(1) |
926 STATUS_BLOCK_SBP_STATUS(
927 SBP_STATUS_DUMMY_ORB_COMPLETE));
928 sbp_send_status(req);
929 sbp_free_request(req);
930 return;
931 default:
932 BUG();
933 }
934 }
935
936 /* used to double-check we haven't been issued an AGENT_RESET */
937 static inline bool tgt_agent_check_active(struct sbp_target_agent *agent)
938 {
939 bool active;
940
941 spin_lock_bh(&agent->lock);
942 active = (agent->state == AGENT_STATE_ACTIVE);
943 spin_unlock_bh(&agent->lock);
944
945 return active;
946 }
947
948 static void tgt_agent_fetch_work(struct work_struct *work)
949 {
950 struct sbp_target_agent *agent =
951 container_of(work, struct sbp_target_agent, work);
952 struct sbp_session *sess = agent->login->sess;
953 struct sbp_target_request *req;
954 int ret;
955 bool doorbell = agent->doorbell;
956 u64 next_orb = agent->orb_pointer;
957
958 while (next_orb && tgt_agent_check_active(agent)) {
959 req = kzalloc(sizeof(*req), GFP_KERNEL);
960 if (!req) {
961 spin_lock_bh(&agent->lock);
962 agent->state = AGENT_STATE_DEAD;
963 spin_unlock_bh(&agent->lock);
964 return;
965 }
966
967 req->login = agent->login;
968 req->orb_pointer = next_orb;
969
970 req->status.status = cpu_to_be32(STATUS_BLOCK_ORB_OFFSET_HIGH(
971 req->orb_pointer >> 32));
972 req->status.orb_low = cpu_to_be32(
973 req->orb_pointer & 0xfffffffc);
974
975 /* read in the ORB */
976 ret = sbp_run_transaction(sess->card, TCODE_READ_BLOCK_REQUEST,
977 sess->node_id, sess->generation, sess->speed,
978 req->orb_pointer, &req->orb, sizeof(req->orb));
979 if (ret != RCODE_COMPLETE) {
980 pr_debug("tgt_orb fetch failed: %x\n", ret);
981 req->status.status |= cpu_to_be32(
982 STATUS_BLOCK_SRC(
983 STATUS_SRC_ORB_FINISHED) |
984 STATUS_BLOCK_RESP(
985 STATUS_RESP_TRANSPORT_FAILURE) |
986 STATUS_BLOCK_DEAD(1) |
987 STATUS_BLOCK_LEN(1) |
988 STATUS_BLOCK_SBP_STATUS(
989 SBP_STATUS_UNSPECIFIED_ERROR));
990 spin_lock_bh(&agent->lock);
991 agent->state = AGENT_STATE_DEAD;
992 spin_unlock_bh(&agent->lock);
993
994 sbp_send_status(req);
995 sbp_free_request(req);
996 return;
997 }
998
999 /* check the next_ORB field */
1000 if (be32_to_cpu(req->orb.next_orb.high) & 0x80000000) {
1001 next_orb = 0;
1002 req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
1003 STATUS_SRC_ORB_FINISHED));
1004 } else {
1005 next_orb = sbp2_pointer_to_addr(&req->orb.next_orb);
1006 req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
1007 STATUS_SRC_ORB_CONTINUING));
1008 }
1009
1010 if (tgt_agent_check_active(agent) && !doorbell) {
1011 INIT_WORK(&req->work, tgt_agent_process_work);
1012 queue_work(system_unbound_wq, &req->work);
1013 } else {
1014 /* don't process this request, just check next_ORB */
1015 sbp_free_request(req);
1016 }
1017
1018 spin_lock_bh(&agent->lock);
1019 doorbell = agent->doorbell = false;
1020
1021 /* check if we should carry on processing */
1022 if (next_orb)
1023 agent->orb_pointer = next_orb;
1024 else
1025 agent->state = AGENT_STATE_SUSPENDED;
1026
1027 spin_unlock_bh(&agent->lock);
1028 };
1029 }
1030
1031 static struct sbp_target_agent *sbp_target_agent_register(
1032 struct sbp_login_descriptor *login)
1033 {
1034 struct sbp_target_agent *agent;
1035 int ret;
1036
1037 agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1038 if (!agent)
1039 return ERR_PTR(-ENOMEM);
1040
1041 spin_lock_init(&agent->lock);
1042
1043 agent->handler.length = 0x20;
1044 agent->handler.address_callback = tgt_agent_rw;
1045 agent->handler.callback_data = agent;
1046
1047 agent->login = login;
1048 agent->state = AGENT_STATE_RESET;
1049 INIT_WORK(&agent->work, tgt_agent_fetch_work);
1050 agent->orb_pointer = 0;
1051 agent->doorbell = false;
1052
1053 ret = fw_core_add_address_handler(&agent->handler,
1054 &sbp_register_region);
1055 if (ret < 0) {
1056 kfree(agent);
1057 return ERR_PTR(ret);
1058 }
1059
1060 return agent;
1061 }
1062
1063 static void sbp_target_agent_unregister(struct sbp_target_agent *agent)
1064 {
1065 fw_core_remove_address_handler(&agent->handler);
1066 cancel_work_sync(&agent->work);
1067 kfree(agent);
1068 }
1069
1070 /*
1071 * Simple wrapper around fw_run_transaction that retries the transaction several
1072 * times in case of failure, with an exponential backoff.
1073 */
1074 static int sbp_run_transaction(struct fw_card *card, int tcode, int destination_id,
1075 int generation, int speed, unsigned long long offset,
1076 void *payload, size_t length)
1077 {
1078 int attempt, ret, delay;
1079
1080 for (attempt = 1; attempt <= 5; attempt++) {
1081 ret = fw_run_transaction(card, tcode, destination_id,
1082 generation, speed, offset, payload, length);
1083
1084 switch (ret) {
1085 case RCODE_COMPLETE:
1086 case RCODE_TYPE_ERROR:
1087 case RCODE_ADDRESS_ERROR:
1088 case RCODE_GENERATION:
1089 return ret;
1090
1091 default:
1092 delay = 5 * attempt * attempt;
1093 usleep_range(delay, delay * 2);
1094 }
1095 }
1096
1097 return ret;
1098 }
1099
1100 /*
1101 * Wrapper around sbp_run_transaction that gets the card, destination,
1102 * generation and speed out of the request's session.
1103 */
1104 static int sbp_run_request_transaction(struct sbp_target_request *req,
1105 int tcode, unsigned long long offset, void *payload,
1106 size_t length)
1107 {
1108 struct sbp_login_descriptor *login = req->login;
1109 struct sbp_session *sess = login->sess;
1110 struct fw_card *card;
1111 int node_id, generation, speed, ret;
1112
1113 spin_lock_bh(&sess->lock);
1114 card = fw_card_get(sess->card);
1115 node_id = sess->node_id;
1116 generation = sess->generation;
1117 speed = sess->speed;
1118 spin_unlock_bh(&sess->lock);
1119
1120 ret = sbp_run_transaction(card, tcode, node_id, generation, speed,
1121 offset, payload, length);
1122
1123 fw_card_put(card);
1124
1125 return ret;
1126 }
1127
1128 static int sbp_fetch_command(struct sbp_target_request *req)
1129 {
1130 int ret, cmd_len, copy_len;
1131
1132 cmd_len = scsi_command_size(req->orb.command_block);
1133
1134 req->cmd_buf = kmalloc(cmd_len, GFP_KERNEL);
1135 if (!req->cmd_buf)
1136 return -ENOMEM;
1137
1138 memcpy(req->cmd_buf, req->orb.command_block,
1139 min_t(int, cmd_len, sizeof(req->orb.command_block)));
1140
1141 if (cmd_len > sizeof(req->orb.command_block)) {
1142 pr_debug("sbp_fetch_command: filling in long command\n");
1143 copy_len = cmd_len - sizeof(req->orb.command_block);
1144
1145 ret = sbp_run_request_transaction(req,
1146 TCODE_READ_BLOCK_REQUEST,
1147 req->orb_pointer + sizeof(req->orb),
1148 req->cmd_buf + sizeof(req->orb.command_block),
1149 copy_len);
1150 if (ret != RCODE_COMPLETE)
1151 return -EIO;
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int sbp_fetch_page_table(struct sbp_target_request *req)
1158 {
1159 int pg_tbl_sz, ret;
1160 struct sbp_page_table_entry *pg_tbl;
1161
1162 if (!CMDBLK_ORB_PG_TBL_PRESENT(be32_to_cpu(req->orb.misc)))
1163 return 0;
1164
1165 pg_tbl_sz = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)) *
1166 sizeof(struct sbp_page_table_entry);
1167
1168 pg_tbl = kmalloc(pg_tbl_sz, GFP_KERNEL);
1169 if (!pg_tbl)
1170 return -ENOMEM;
1171
1172 ret = sbp_run_request_transaction(req, TCODE_READ_BLOCK_REQUEST,
1173 sbp2_pointer_to_addr(&req->orb.data_descriptor),
1174 pg_tbl, pg_tbl_sz);
1175 if (ret != RCODE_COMPLETE) {
1176 kfree(pg_tbl);
1177 return -EIO;
1178 }
1179
1180 req->pg_tbl = pg_tbl;
1181 return 0;
1182 }
1183
1184 static void sbp_calc_data_length_direction(struct sbp_target_request *req,
1185 u32 *data_len, enum dma_data_direction *data_dir)
1186 {
1187 int data_size, direction, idx;
1188
1189 data_size = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1190 direction = CMDBLK_ORB_DIRECTION(be32_to_cpu(req->orb.misc));
1191
1192 if (!data_size) {
1193 *data_len = 0;
1194 *data_dir = DMA_NONE;
1195 return;
1196 }
1197
1198 *data_dir = direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1199
1200 if (req->pg_tbl) {
1201 *data_len = 0;
1202 for (idx = 0; idx < data_size; idx++) {
1203 *data_len += be16_to_cpu(
1204 req->pg_tbl[idx].segment_length);
1205 }
1206 } else {
1207 *data_len = data_size;
1208 }
1209 }
1210
1211 static void sbp_handle_command(struct sbp_target_request *req)
1212 {
1213 struct sbp_login_descriptor *login = req->login;
1214 struct sbp_session *sess = login->sess;
1215 int ret, unpacked_lun;
1216 u32 data_length;
1217 enum dma_data_direction data_dir;
1218
1219 ret = sbp_fetch_command(req);
1220 if (ret) {
1221 pr_debug("sbp_handle_command: fetch command failed: %d\n", ret);
1222 goto err;
1223 }
1224
1225 ret = sbp_fetch_page_table(req);
1226 if (ret) {
1227 pr_debug("sbp_handle_command: fetch page table failed: %d\n",
1228 ret);
1229 goto err;
1230 }
1231
1232 unpacked_lun = req->login->lun->unpacked_lun;
1233 sbp_calc_data_length_direction(req, &data_length, &data_dir);
1234
1235 pr_debug("sbp_handle_command ORB:0x%llx unpacked_lun:%d data_len:%d data_dir:%d\n",
1236 req->orb_pointer, unpacked_lun, data_length, data_dir);
1237
1238 if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf,
1239 req->sense_buf, unpacked_lun, data_length,
1240 MSG_SIMPLE_TAG, data_dir, 0))
1241 goto err;
1242
1243 return;
1244
1245 err:
1246 req->status.status |= cpu_to_be32(
1247 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1248 STATUS_BLOCK_DEAD(0) |
1249 STATUS_BLOCK_LEN(1) |
1250 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1251 sbp_send_status(req);
1252 sbp_free_request(req);
1253 }
1254
1255 /*
1256 * DMA_TO_DEVICE = read from initiator (SCSI WRITE)
1257 * DMA_FROM_DEVICE = write to initiator (SCSI READ)
1258 */
1259 static int sbp_rw_data(struct sbp_target_request *req)
1260 {
1261 struct sbp_session *sess = req->login->sess;
1262 int tcode, sg_miter_flags, max_payload, pg_size, speed, node_id,
1263 generation, num_pte, length, tfr_length,
1264 rcode = RCODE_COMPLETE;
1265 struct sbp_page_table_entry *pte;
1266 unsigned long long offset;
1267 struct fw_card *card;
1268 struct sg_mapping_iter iter;
1269
1270 if (req->se_cmd.data_direction == DMA_FROM_DEVICE) {
1271 tcode = TCODE_WRITE_BLOCK_REQUEST;
1272 sg_miter_flags = SG_MITER_FROM_SG;
1273 } else {
1274 tcode = TCODE_READ_BLOCK_REQUEST;
1275 sg_miter_flags = SG_MITER_TO_SG;
1276 }
1277
1278 max_payload = 4 << CMDBLK_ORB_MAX_PAYLOAD(be32_to_cpu(req->orb.misc));
1279 speed = CMDBLK_ORB_SPEED(be32_to_cpu(req->orb.misc));
1280
1281 pg_size = CMDBLK_ORB_PG_SIZE(be32_to_cpu(req->orb.misc));
1282 if (pg_size) {
1283 pr_err("sbp_run_transaction: page size ignored\n");
1284 pg_size = 0x100 << pg_size;
1285 }
1286
1287 spin_lock_bh(&sess->lock);
1288 card = fw_card_get(sess->card);
1289 node_id = sess->node_id;
1290 generation = sess->generation;
1291 spin_unlock_bh(&sess->lock);
1292
1293 if (req->pg_tbl) {
1294 pte = req->pg_tbl;
1295 num_pte = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1296
1297 offset = 0;
1298 length = 0;
1299 } else {
1300 pte = NULL;
1301 num_pte = 0;
1302
1303 offset = sbp2_pointer_to_addr(&req->orb.data_descriptor);
1304 length = req->se_cmd.data_length;
1305 }
1306
1307 sg_miter_start(&iter, req->se_cmd.t_data_sg, req->se_cmd.t_data_nents,
1308 sg_miter_flags);
1309
1310 while (length || num_pte) {
1311 if (!length) {
1312 offset = (u64)be16_to_cpu(pte->segment_base_hi) << 32 |
1313 be32_to_cpu(pte->segment_base_lo);
1314 length = be16_to_cpu(pte->segment_length);
1315
1316 pte++;
1317 num_pte--;
1318 }
1319
1320 sg_miter_next(&iter);
1321
1322 tfr_length = min3(length, max_payload, (int)iter.length);
1323
1324 /* FIXME: take page_size into account */
1325
1326 rcode = sbp_run_transaction(card, tcode, node_id,
1327 generation, speed,
1328 offset, iter.addr, tfr_length);
1329
1330 if (rcode != RCODE_COMPLETE)
1331 break;
1332
1333 length -= tfr_length;
1334 offset += tfr_length;
1335 iter.consumed = tfr_length;
1336 }
1337
1338 sg_miter_stop(&iter);
1339 fw_card_put(card);
1340
1341 if (rcode == RCODE_COMPLETE) {
1342 WARN_ON(length != 0);
1343 return 0;
1344 } else {
1345 return -EIO;
1346 }
1347 }
1348
1349 static int sbp_send_status(struct sbp_target_request *req)
1350 {
1351 int ret, length;
1352 struct sbp_login_descriptor *login = req->login;
1353
1354 length = (((be32_to_cpu(req->status.status) >> 24) & 0x07) + 1) * 4;
1355
1356 ret = sbp_run_request_transaction(req, TCODE_WRITE_BLOCK_REQUEST,
1357 login->status_fifo_addr, &req->status, length);
1358 if (ret != RCODE_COMPLETE) {
1359 pr_debug("sbp_send_status: write failed: 0x%x\n", ret);
1360 return -EIO;
1361 }
1362
1363 pr_debug("sbp_send_status: status write complete for ORB: 0x%llx\n",
1364 req->orb_pointer);
1365
1366 return 0;
1367 }
1368
1369 static void sbp_sense_mangle(struct sbp_target_request *req)
1370 {
1371 struct se_cmd *se_cmd = &req->se_cmd;
1372 u8 *sense = req->sense_buf;
1373 u8 *status = req->status.data;
1374
1375 WARN_ON(se_cmd->scsi_sense_length < 18);
1376
1377 switch (sense[0] & 0x7f) { /* sfmt */
1378 case 0x70: /* current, fixed */
1379 status[0] = 0 << 6;
1380 break;
1381 case 0x71: /* deferred, fixed */
1382 status[0] = 1 << 6;
1383 break;
1384 case 0x72: /* current, descriptor */
1385 case 0x73: /* deferred, descriptor */
1386 default:
1387 /*
1388 * TODO: SBP-3 specifies what we should do with descriptor
1389 * format sense data
1390 */
1391 pr_err("sbp_send_sense: unknown sense format: 0x%x\n",
1392 sense[0]);
1393 req->status.status |= cpu_to_be32(
1394 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1395 STATUS_BLOCK_DEAD(0) |
1396 STATUS_BLOCK_LEN(1) |
1397 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQUEST_ABORTED));
1398 return;
1399 }
1400
1401 status[0] |= se_cmd->scsi_status & 0x3f;/* status */
1402 status[1] =
1403 (sense[0] & 0x80) | /* valid */
1404 ((sense[2] & 0xe0) >> 1) | /* mark, eom, ili */
1405 (sense[2] & 0x0f); /* sense_key */
1406 status[2] = se_cmd->scsi_asc; /* sense_code */
1407 status[3] = se_cmd->scsi_ascq; /* sense_qualifier */
1408
1409 /* information */
1410 status[4] = sense[3];
1411 status[5] = sense[4];
1412 status[6] = sense[5];
1413 status[7] = sense[6];
1414
1415 /* CDB-dependent */
1416 status[8] = sense[8];
1417 status[9] = sense[9];
1418 status[10] = sense[10];
1419 status[11] = sense[11];
1420
1421 /* fru */
1422 status[12] = sense[14];
1423
1424 /* sense_key-dependent */
1425 status[13] = sense[15];
1426 status[14] = sense[16];
1427 status[15] = sense[17];
1428
1429 req->status.status |= cpu_to_be32(
1430 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1431 STATUS_BLOCK_DEAD(0) |
1432 STATUS_BLOCK_LEN(5) |
1433 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1434 }
1435
1436 static int sbp_send_sense(struct sbp_target_request *req)
1437 {
1438 struct se_cmd *se_cmd = &req->se_cmd;
1439
1440 if (se_cmd->scsi_sense_length) {
1441 sbp_sense_mangle(req);
1442 } else {
1443 req->status.status |= cpu_to_be32(
1444 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1445 STATUS_BLOCK_DEAD(0) |
1446 STATUS_BLOCK_LEN(1) |
1447 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1448 }
1449
1450 return sbp_send_status(req);
1451 }
1452
1453 static void sbp_free_request(struct sbp_target_request *req)
1454 {
1455 kfree(req->pg_tbl);
1456 kfree(req->cmd_buf);
1457 kfree(req);
1458 }
1459
1460 static void sbp_mgt_agent_process(struct work_struct *work)
1461 {
1462 struct sbp_management_agent *agent =
1463 container_of(work, struct sbp_management_agent, work);
1464 struct sbp_management_request *req = agent->request;
1465 int ret;
1466 int status_data_len = 0;
1467
1468 /* fetch the ORB from the initiator */
1469 ret = sbp_run_transaction(req->card, TCODE_READ_BLOCK_REQUEST,
1470 req->node_addr, req->generation, req->speed,
1471 agent->orb_offset, &req->orb, sizeof(req->orb));
1472 if (ret != RCODE_COMPLETE) {
1473 pr_debug("mgt_orb fetch failed: %x\n", ret);
1474 goto out;
1475 }
1476
1477 pr_debug("mgt_orb ptr1:0x%llx ptr2:0x%llx misc:0x%x len:0x%x status_fifo:0x%llx\n",
1478 sbp2_pointer_to_addr(&req->orb.ptr1),
1479 sbp2_pointer_to_addr(&req->orb.ptr2),
1480 be32_to_cpu(req->orb.misc), be32_to_cpu(req->orb.length),
1481 sbp2_pointer_to_addr(&req->orb.status_fifo));
1482
1483 if (!ORB_NOTIFY(be32_to_cpu(req->orb.misc)) ||
1484 ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc)) != 0) {
1485 pr_err("mgt_orb bad request\n");
1486 goto out;
1487 }
1488
1489 switch (MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc))) {
1490 case MANAGEMENT_ORB_FUNCTION_LOGIN:
1491 sbp_management_request_login(agent, req, &status_data_len);
1492 break;
1493
1494 case MANAGEMENT_ORB_FUNCTION_QUERY_LOGINS:
1495 sbp_management_request_query_logins(agent, req,
1496 &status_data_len);
1497 break;
1498
1499 case MANAGEMENT_ORB_FUNCTION_RECONNECT:
1500 sbp_management_request_reconnect(agent, req, &status_data_len);
1501 break;
1502
1503 case MANAGEMENT_ORB_FUNCTION_SET_PASSWORD:
1504 pr_notice("SET PASSWORD not implemented\n");
1505
1506 req->status.status = cpu_to_be32(
1507 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1508 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1509
1510 break;
1511
1512 case MANAGEMENT_ORB_FUNCTION_LOGOUT:
1513 sbp_management_request_logout(agent, req, &status_data_len);
1514 break;
1515
1516 case MANAGEMENT_ORB_FUNCTION_ABORT_TASK:
1517 pr_notice("ABORT TASK not implemented\n");
1518
1519 req->status.status = cpu_to_be32(
1520 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1521 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1522
1523 break;
1524
1525 case MANAGEMENT_ORB_FUNCTION_ABORT_TASK_SET:
1526 pr_notice("ABORT TASK SET not implemented\n");
1527
1528 req->status.status = cpu_to_be32(
1529 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1530 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1531
1532 break;
1533
1534 case MANAGEMENT_ORB_FUNCTION_LOGICAL_UNIT_RESET:
1535 pr_notice("LOGICAL UNIT RESET not implemented\n");
1536
1537 req->status.status = cpu_to_be32(
1538 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1539 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1540
1541 break;
1542
1543 case MANAGEMENT_ORB_FUNCTION_TARGET_RESET:
1544 pr_notice("TARGET RESET not implemented\n");
1545
1546 req->status.status = cpu_to_be32(
1547 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1548 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1549
1550 break;
1551
1552 default:
1553 pr_notice("unknown management function 0x%x\n",
1554 MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc)));
1555
1556 req->status.status = cpu_to_be32(
1557 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1558 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1559
1560 break;
1561 }
1562
1563 req->status.status |= cpu_to_be32(
1564 STATUS_BLOCK_SRC(1) | /* Response to ORB, next_ORB absent */
1565 STATUS_BLOCK_LEN(DIV_ROUND_UP(status_data_len, 4) + 1) |
1566 STATUS_BLOCK_ORB_OFFSET_HIGH(agent->orb_offset >> 32));
1567 req->status.orb_low = cpu_to_be32(agent->orb_offset);
1568
1569 /* write the status block back to the initiator */
1570 ret = sbp_run_transaction(req->card, TCODE_WRITE_BLOCK_REQUEST,
1571 req->node_addr, req->generation, req->speed,
1572 sbp2_pointer_to_addr(&req->orb.status_fifo),
1573 &req->status, 8 + status_data_len);
1574 if (ret != RCODE_COMPLETE) {
1575 pr_debug("mgt_orb status write failed: %x\n", ret);
1576 goto out;
1577 }
1578
1579 out:
1580 fw_card_put(req->card);
1581 kfree(req);
1582
1583 spin_lock_bh(&agent->lock);
1584 agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1585 spin_unlock_bh(&agent->lock);
1586 }
1587
1588 static void sbp_mgt_agent_rw(struct fw_card *card,
1589 struct fw_request *request, int tcode, int destination, int source,
1590 int generation, unsigned long long offset, void *data, size_t length,
1591 void *callback_data)
1592 {
1593 struct sbp_management_agent *agent = callback_data;
1594 struct sbp2_pointer *ptr = data;
1595 int rcode = RCODE_ADDRESS_ERROR;
1596
1597 if (!agent->tport->enable)
1598 goto out;
1599
1600 if ((offset != agent->handler.offset) || (length != 8))
1601 goto out;
1602
1603 if (tcode == TCODE_WRITE_BLOCK_REQUEST) {
1604 struct sbp_management_request *req;
1605 int prev_state;
1606
1607 spin_lock_bh(&agent->lock);
1608 prev_state = agent->state;
1609 agent->state = MANAGEMENT_AGENT_STATE_BUSY;
1610 spin_unlock_bh(&agent->lock);
1611
1612 if (prev_state == MANAGEMENT_AGENT_STATE_BUSY) {
1613 pr_notice("ignoring management request while busy\n");
1614 rcode = RCODE_CONFLICT_ERROR;
1615 goto out;
1616 }
1617
1618 req = kzalloc(sizeof(*req), GFP_ATOMIC);
1619 if (!req) {
1620 rcode = RCODE_CONFLICT_ERROR;
1621 goto out;
1622 }
1623
1624 req->card = fw_card_get(card);
1625 req->generation = generation;
1626 req->node_addr = source;
1627 req->speed = fw_get_request_speed(request);
1628
1629 agent->orb_offset = sbp2_pointer_to_addr(ptr);
1630 agent->request = req;
1631
1632 queue_work(system_unbound_wq, &agent->work);
1633 rcode = RCODE_COMPLETE;
1634 } else if (tcode == TCODE_READ_BLOCK_REQUEST) {
1635 addr_to_sbp2_pointer(agent->orb_offset, ptr);
1636 rcode = RCODE_COMPLETE;
1637 } else {
1638 rcode = RCODE_TYPE_ERROR;
1639 }
1640
1641 out:
1642 fw_send_response(card, request, rcode);
1643 }
1644
1645 static struct sbp_management_agent *sbp_management_agent_register(
1646 struct sbp_tport *tport)
1647 {
1648 int ret;
1649 struct sbp_management_agent *agent;
1650
1651 agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1652 if (!agent)
1653 return ERR_PTR(-ENOMEM);
1654
1655 spin_lock_init(&agent->lock);
1656 agent->tport = tport;
1657 agent->handler.length = 0x08;
1658 agent->handler.address_callback = sbp_mgt_agent_rw;
1659 agent->handler.callback_data = agent;
1660 agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1661 INIT_WORK(&agent->work, sbp_mgt_agent_process);
1662 agent->orb_offset = 0;
1663 agent->request = NULL;
1664
1665 ret = fw_core_add_address_handler(&agent->handler,
1666 &sbp_register_region);
1667 if (ret < 0) {
1668 kfree(agent);
1669 return ERR_PTR(ret);
1670 }
1671
1672 return agent;
1673 }
1674
1675 static void sbp_management_agent_unregister(struct sbp_management_agent *agent)
1676 {
1677 fw_core_remove_address_handler(&agent->handler);
1678 cancel_work_sync(&agent->work);
1679 kfree(agent);
1680 }
1681
1682 static int sbp_check_true(struct se_portal_group *se_tpg)
1683 {
1684 return 1;
1685 }
1686
1687 static int sbp_check_false(struct se_portal_group *se_tpg)
1688 {
1689 return 0;
1690 }
1691
1692 static char *sbp_get_fabric_name(void)
1693 {
1694 return "sbp";
1695 }
1696
1697 static char *sbp_get_fabric_wwn(struct se_portal_group *se_tpg)
1698 {
1699 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1700 struct sbp_tport *tport = tpg->tport;
1701
1702 return &tport->tport_name[0];
1703 }
1704
1705 static u16 sbp_get_tag(struct se_portal_group *se_tpg)
1706 {
1707 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1708 return tpg->tport_tpgt;
1709 }
1710
1711 static u32 sbp_get_default_depth(struct se_portal_group *se_tpg)
1712 {
1713 return 1;
1714 }
1715
1716 static struct se_node_acl *sbp_alloc_fabric_acl(struct se_portal_group *se_tpg)
1717 {
1718 struct sbp_nacl *nacl;
1719
1720 nacl = kzalloc(sizeof(struct sbp_nacl), GFP_KERNEL);
1721 if (!nacl) {
1722 pr_err("Unable to alocate struct sbp_nacl\n");
1723 return NULL;
1724 }
1725
1726 return &nacl->se_node_acl;
1727 }
1728
1729 static void sbp_release_fabric_acl(
1730 struct se_portal_group *se_tpg,
1731 struct se_node_acl *se_nacl)
1732 {
1733 struct sbp_nacl *nacl =
1734 container_of(se_nacl, struct sbp_nacl, se_node_acl);
1735 kfree(nacl);
1736 }
1737
1738 static u32 sbp_tpg_get_inst_index(struct se_portal_group *se_tpg)
1739 {
1740 return 1;
1741 }
1742
1743 static void sbp_release_cmd(struct se_cmd *se_cmd)
1744 {
1745 struct sbp_target_request *req = container_of(se_cmd,
1746 struct sbp_target_request, se_cmd);
1747
1748 sbp_free_request(req);
1749 }
1750
1751 static int sbp_shutdown_session(struct se_session *se_sess)
1752 {
1753 return 0;
1754 }
1755
1756 static void sbp_close_session(struct se_session *se_sess)
1757 {
1758 return;
1759 }
1760
1761 static u32 sbp_sess_get_index(struct se_session *se_sess)
1762 {
1763 return 0;
1764 }
1765
1766 static int sbp_write_pending(struct se_cmd *se_cmd)
1767 {
1768 struct sbp_target_request *req = container_of(se_cmd,
1769 struct sbp_target_request, se_cmd);
1770 int ret;
1771
1772 ret = sbp_rw_data(req);
1773 if (ret) {
1774 req->status.status |= cpu_to_be32(
1775 STATUS_BLOCK_RESP(
1776 STATUS_RESP_TRANSPORT_FAILURE) |
1777 STATUS_BLOCK_DEAD(0) |
1778 STATUS_BLOCK_LEN(1) |
1779 STATUS_BLOCK_SBP_STATUS(
1780 SBP_STATUS_UNSPECIFIED_ERROR));
1781 sbp_send_status(req);
1782 return ret;
1783 }
1784
1785 target_execute_cmd(se_cmd);
1786 return 0;
1787 }
1788
1789 static int sbp_write_pending_status(struct se_cmd *se_cmd)
1790 {
1791 return 0;
1792 }
1793
1794 static void sbp_set_default_node_attrs(struct se_node_acl *nacl)
1795 {
1796 return;
1797 }
1798
1799 static u32 sbp_get_task_tag(struct se_cmd *se_cmd)
1800 {
1801 struct sbp_target_request *req = container_of(se_cmd,
1802 struct sbp_target_request, se_cmd);
1803
1804 /* only used for printk until we do TMRs */
1805 return (u32)req->orb_pointer;
1806 }
1807
1808 static int sbp_get_cmd_state(struct se_cmd *se_cmd)
1809 {
1810 return 0;
1811 }
1812
1813 static int sbp_queue_data_in(struct se_cmd *se_cmd)
1814 {
1815 struct sbp_target_request *req = container_of(se_cmd,
1816 struct sbp_target_request, se_cmd);
1817 int ret;
1818
1819 ret = sbp_rw_data(req);
1820 if (ret) {
1821 req->status.status |= cpu_to_be32(
1822 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1823 STATUS_BLOCK_DEAD(0) |
1824 STATUS_BLOCK_LEN(1) |
1825 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1826 sbp_send_status(req);
1827 return ret;
1828 }
1829
1830 return sbp_send_sense(req);
1831 }
1832
1833 /*
1834 * Called after command (no data transfer) or after the write (to device)
1835 * operation is completed
1836 */
1837 static int sbp_queue_status(struct se_cmd *se_cmd)
1838 {
1839 struct sbp_target_request *req = container_of(se_cmd,
1840 struct sbp_target_request, se_cmd);
1841
1842 return sbp_send_sense(req);
1843 }
1844
1845 static int sbp_queue_tm_rsp(struct se_cmd *se_cmd)
1846 {
1847 return 0;
1848 }
1849
1850 static u16 sbp_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
1851 {
1852 return 0;
1853 }
1854
1855 static u16 sbp_get_fabric_sense_len(void)
1856 {
1857 return 0;
1858 }
1859
1860 static int sbp_check_stop_free(struct se_cmd *se_cmd)
1861 {
1862 struct sbp_target_request *req = container_of(se_cmd,
1863 struct sbp_target_request, se_cmd);
1864
1865 transport_generic_free_cmd(&req->se_cmd, 0);
1866 return 1;
1867 }
1868
1869 /*
1870 * Handlers for Serial Bus Protocol 2/3 (SBP-2 / SBP-3)
1871 */
1872 static u8 sbp_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1873 {
1874 /*
1875 * Return a IEEE 1394 SCSI Protocol identifier for loopback operations
1876 * This is defined in section 7.5.1 Table 362 in spc4r17
1877 */
1878 return SCSI_PROTOCOL_SBP;
1879 }
1880
1881 static u32 sbp_get_pr_transport_id(
1882 struct se_portal_group *se_tpg,
1883 struct se_node_acl *se_nacl,
1884 struct t10_pr_registration *pr_reg,
1885 int *format_code,
1886 unsigned char *buf)
1887 {
1888 int ret;
1889
1890 /*
1891 * Set PROTOCOL IDENTIFIER to 3h for SBP
1892 */
1893 buf[0] = SCSI_PROTOCOL_SBP;
1894 /*
1895 * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1896 * over IEEE 1394
1897 */
1898 ret = hex2bin(&buf[8], se_nacl->initiatorname, 8);
1899 if (ret < 0)
1900 pr_debug("sbp transport_id: invalid hex string\n");
1901
1902 /*
1903 * The IEEE 1394 Transport ID is a hardcoded 24-byte length
1904 */
1905 return 24;
1906 }
1907
1908 static u32 sbp_get_pr_transport_id_len(
1909 struct se_portal_group *se_tpg,
1910 struct se_node_acl *se_nacl,
1911 struct t10_pr_registration *pr_reg,
1912 int *format_code)
1913 {
1914 *format_code = 0;
1915 /*
1916 * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1917 * over IEEE 1394
1918 *
1919 * The SBP Transport ID is a hardcoded 24-byte length
1920 */
1921 return 24;
1922 }
1923
1924 /*
1925 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
1926 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
1927 */
1928 static char *sbp_parse_pr_out_transport_id(
1929 struct se_portal_group *se_tpg,
1930 const char *buf,
1931 u32 *out_tid_len,
1932 char **port_nexus_ptr)
1933 {
1934 /*
1935 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.4 TransportID
1936 * for initiator ports using SCSI over SBP Serial SCSI Protocol
1937 *
1938 * The TransportID for a IEEE 1394 Initiator Port is of fixed size of
1939 * 24 bytes, and IEEE 1394 does not contain a I_T nexus identifier,
1940 * so we return the **port_nexus_ptr set to NULL.
1941 */
1942 *port_nexus_ptr = NULL;
1943 *out_tid_len = 24;
1944
1945 return (char *)&buf[8];
1946 }
1947
1948 static int sbp_count_se_tpg_luns(struct se_portal_group *tpg)
1949 {
1950 int i, count = 0;
1951
1952 spin_lock(&tpg->tpg_lun_lock);
1953 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1954 struct se_lun *se_lun = tpg->tpg_lun_list[i];
1955
1956 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
1957 continue;
1958
1959 count++;
1960 }
1961 spin_unlock(&tpg->tpg_lun_lock);
1962
1963 return count;
1964 }
1965
1966 static int sbp_update_unit_directory(struct sbp_tport *tport)
1967 {
1968 int num_luns, num_entries, idx = 0, mgt_agt_addr, ret, i;
1969 u32 *data;
1970
1971 if (tport->unit_directory.data) {
1972 fw_core_remove_descriptor(&tport->unit_directory);
1973 kfree(tport->unit_directory.data);
1974 tport->unit_directory.data = NULL;
1975 }
1976
1977 if (!tport->enable || !tport->tpg)
1978 return 0;
1979
1980 num_luns = sbp_count_se_tpg_luns(&tport->tpg->se_tpg);
1981
1982 /*
1983 * Number of entries in the final unit directory:
1984 * - all of those in the template
1985 * - management_agent
1986 * - unit_characteristics
1987 * - reconnect_timeout
1988 * - unit unique ID
1989 * - one for each LUN
1990 *
1991 * MUST NOT include leaf or sub-directory entries
1992 */
1993 num_entries = ARRAY_SIZE(sbp_unit_directory_template) + 4 + num_luns;
1994
1995 if (tport->directory_id != -1)
1996 num_entries++;
1997
1998 /* allocate num_entries + 4 for the header and unique ID leaf */
1999 data = kcalloc((num_entries + 4), sizeof(u32), GFP_KERNEL);
2000 if (!data)
2001 return -ENOMEM;
2002
2003 /* directory_length */
2004 data[idx++] = num_entries << 16;
2005
2006 /* directory_id */
2007 if (tport->directory_id != -1)
2008 data[idx++] = (CSR_DIRECTORY_ID << 24) | tport->directory_id;
2009
2010 /* unit directory template */
2011 memcpy(&data[idx], sbp_unit_directory_template,
2012 sizeof(sbp_unit_directory_template));
2013 idx += ARRAY_SIZE(sbp_unit_directory_template);
2014
2015 /* management_agent */
2016 mgt_agt_addr = (tport->mgt_agt->handler.offset - CSR_REGISTER_BASE) / 4;
2017 data[idx++] = 0x54000000 | (mgt_agt_addr & 0x00ffffff);
2018
2019 /* unit_characteristics */
2020 data[idx++] = 0x3a000000 |
2021 (((tport->mgt_orb_timeout * 2) << 8) & 0xff00) |
2022 SBP_ORB_FETCH_SIZE;
2023
2024 /* reconnect_timeout */
2025 data[idx++] = 0x3d000000 | (tport->max_reconnect_timeout & 0xffff);
2026
2027 /* unit unique ID (leaf is just after LUNs) */
2028 data[idx++] = 0x8d000000 | (num_luns + 1);
2029
2030 spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
2031 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
2032 struct se_lun *se_lun = tport->tpg->se_tpg.tpg_lun_list[i];
2033 struct se_device *dev;
2034 int type;
2035
2036 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
2037 continue;
2038
2039 spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2040
2041 dev = se_lun->lun_se_dev;
2042 type = dev->transport->get_device_type(dev);
2043
2044 /* logical_unit_number */
2045 data[idx++] = 0x14000000 |
2046 ((type << 16) & 0x1f0000) |
2047 (se_lun->unpacked_lun & 0xffff);
2048
2049 spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
2050 }
2051 spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2052
2053 /* unit unique ID leaf */
2054 data[idx++] = 2 << 16;
2055 data[idx++] = tport->guid >> 32;
2056 data[idx++] = tport->guid;
2057
2058 tport->unit_directory.length = idx;
2059 tport->unit_directory.key = (CSR_DIRECTORY | CSR_UNIT) << 24;
2060 tport->unit_directory.data = data;
2061
2062 ret = fw_core_add_descriptor(&tport->unit_directory);
2063 if (ret < 0) {
2064 kfree(tport->unit_directory.data);
2065 tport->unit_directory.data = NULL;
2066 }
2067
2068 return ret;
2069 }
2070
2071 static ssize_t sbp_parse_wwn(const char *name, u64 *wwn, int strict)
2072 {
2073 const char *cp;
2074 char c, nibble;
2075 int pos = 0, err;
2076
2077 *wwn = 0;
2078 for (cp = name; cp < &name[SBP_NAMELEN - 1]; cp++) {
2079 c = *cp;
2080 if (c == '\n' && cp[1] == '\0')
2081 continue;
2082 if (c == '\0') {
2083 err = 2;
2084 if (pos != 16)
2085 goto fail;
2086 return cp - name;
2087 }
2088 err = 3;
2089 if (isdigit(c))
2090 nibble = c - '0';
2091 else if (isxdigit(c) && (islower(c) || !strict))
2092 nibble = tolower(c) - 'a' + 10;
2093 else
2094 goto fail;
2095 *wwn = (*wwn << 4) | nibble;
2096 pos++;
2097 }
2098 err = 4;
2099 fail:
2100 printk(KERN_INFO "err %u len %zu pos %u\n",
2101 err, cp - name, pos);
2102 return -1;
2103 }
2104
2105 static ssize_t sbp_format_wwn(char *buf, size_t len, u64 wwn)
2106 {
2107 return snprintf(buf, len, "%016llx", wwn);
2108 }
2109
2110 static struct se_node_acl *sbp_make_nodeacl(
2111 struct se_portal_group *se_tpg,
2112 struct config_group *group,
2113 const char *name)
2114 {
2115 struct se_node_acl *se_nacl, *se_nacl_new;
2116 struct sbp_nacl *nacl;
2117 u64 guid = 0;
2118 u32 nexus_depth = 1;
2119
2120 if (sbp_parse_wwn(name, &guid, 1) < 0)
2121 return ERR_PTR(-EINVAL);
2122
2123 se_nacl_new = sbp_alloc_fabric_acl(se_tpg);
2124 if (!se_nacl_new)
2125 return ERR_PTR(-ENOMEM);
2126
2127 /*
2128 * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
2129 * when converting a NodeACL from demo mode -> explict
2130 */
2131 se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
2132 name, nexus_depth);
2133 if (IS_ERR(se_nacl)) {
2134 sbp_release_fabric_acl(se_tpg, se_nacl_new);
2135 return se_nacl;
2136 }
2137
2138 nacl = container_of(se_nacl, struct sbp_nacl, se_node_acl);
2139 nacl->guid = guid;
2140 sbp_format_wwn(nacl->iport_name, SBP_NAMELEN, guid);
2141
2142 return se_nacl;
2143 }
2144
2145 static void sbp_drop_nodeacl(struct se_node_acl *se_acl)
2146 {
2147 struct sbp_nacl *nacl =
2148 container_of(se_acl, struct sbp_nacl, se_node_acl);
2149
2150 core_tpg_del_initiator_node_acl(se_acl->se_tpg, se_acl, 1);
2151 kfree(nacl);
2152 }
2153
2154 static int sbp_post_link_lun(
2155 struct se_portal_group *se_tpg,
2156 struct se_lun *se_lun)
2157 {
2158 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2159
2160 return sbp_update_unit_directory(tpg->tport);
2161 }
2162
2163 static void sbp_pre_unlink_lun(
2164 struct se_portal_group *se_tpg,
2165 struct se_lun *se_lun)
2166 {
2167 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2168 struct sbp_tport *tport = tpg->tport;
2169 int ret;
2170
2171 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0)
2172 tport->enable = 0;
2173
2174 ret = sbp_update_unit_directory(tport);
2175 if (ret < 0)
2176 pr_err("unlink LUN: failed to update unit directory\n");
2177 }
2178
2179 static struct se_portal_group *sbp_make_tpg(
2180 struct se_wwn *wwn,
2181 struct config_group *group,
2182 const char *name)
2183 {
2184 struct sbp_tport *tport =
2185 container_of(wwn, struct sbp_tport, tport_wwn);
2186
2187 struct sbp_tpg *tpg;
2188 unsigned long tpgt;
2189 int ret;
2190
2191 if (strstr(name, "tpgt_") != name)
2192 return ERR_PTR(-EINVAL);
2193 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
2194 return ERR_PTR(-EINVAL);
2195
2196 if (tport->tpg) {
2197 pr_err("Only one TPG per Unit is possible.\n");
2198 return ERR_PTR(-EBUSY);
2199 }
2200
2201 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2202 if (!tpg) {
2203 pr_err("Unable to allocate struct sbp_tpg\n");
2204 return ERR_PTR(-ENOMEM);
2205 }
2206
2207 tpg->tport = tport;
2208 tpg->tport_tpgt = tpgt;
2209 tport->tpg = tpg;
2210
2211 /* default attribute values */
2212 tport->enable = 0;
2213 tport->directory_id = -1;
2214 tport->mgt_orb_timeout = 15;
2215 tport->max_reconnect_timeout = 5;
2216 tport->max_logins_per_lun = 1;
2217
2218 tport->mgt_agt = sbp_management_agent_register(tport);
2219 if (IS_ERR(tport->mgt_agt)) {
2220 ret = PTR_ERR(tport->mgt_agt);
2221 kfree(tpg);
2222 return ERR_PTR(ret);
2223 }
2224
2225 ret = core_tpg_register(&sbp_fabric_configfs->tf_ops, wwn,
2226 &tpg->se_tpg, (void *)tpg,
2227 TRANSPORT_TPG_TYPE_NORMAL);
2228 if (ret < 0) {
2229 sbp_management_agent_unregister(tport->mgt_agt);
2230 kfree(tpg);
2231 return ERR_PTR(ret);
2232 }
2233
2234 return &tpg->se_tpg;
2235 }
2236
2237 static void sbp_drop_tpg(struct se_portal_group *se_tpg)
2238 {
2239 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2240 struct sbp_tport *tport = tpg->tport;
2241
2242 core_tpg_deregister(se_tpg);
2243 sbp_management_agent_unregister(tport->mgt_agt);
2244 tport->tpg = NULL;
2245 kfree(tpg);
2246 }
2247
2248 static struct se_wwn *sbp_make_tport(
2249 struct target_fabric_configfs *tf,
2250 struct config_group *group,
2251 const char *name)
2252 {
2253 struct sbp_tport *tport;
2254 u64 guid = 0;
2255
2256 if (sbp_parse_wwn(name, &guid, 1) < 0)
2257 return ERR_PTR(-EINVAL);
2258
2259 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2260 if (!tport) {
2261 pr_err("Unable to allocate struct sbp_tport\n");
2262 return ERR_PTR(-ENOMEM);
2263 }
2264
2265 tport->guid = guid;
2266 sbp_format_wwn(tport->tport_name, SBP_NAMELEN, guid);
2267
2268 return &tport->tport_wwn;
2269 }
2270
2271 static void sbp_drop_tport(struct se_wwn *wwn)
2272 {
2273 struct sbp_tport *tport =
2274 container_of(wwn, struct sbp_tport, tport_wwn);
2275
2276 kfree(tport);
2277 }
2278
2279 static ssize_t sbp_wwn_show_attr_version(
2280 struct target_fabric_configfs *tf,
2281 char *page)
2282 {
2283 return sprintf(page, "FireWire SBP fabric module %s\n", SBP_VERSION);
2284 }
2285
2286 TF_WWN_ATTR_RO(sbp, version);
2287
2288 static struct configfs_attribute *sbp_wwn_attrs[] = {
2289 &sbp_wwn_version.attr,
2290 NULL,
2291 };
2292
2293 static ssize_t sbp_tpg_show_directory_id(
2294 struct se_portal_group *se_tpg,
2295 char *page)
2296 {
2297 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2298 struct sbp_tport *tport = tpg->tport;
2299
2300 if (tport->directory_id == -1)
2301 return sprintf(page, "implicit\n");
2302 else
2303 return sprintf(page, "%06x\n", tport->directory_id);
2304 }
2305
2306 static ssize_t sbp_tpg_store_directory_id(
2307 struct se_portal_group *se_tpg,
2308 const char *page,
2309 size_t count)
2310 {
2311 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2312 struct sbp_tport *tport = tpg->tport;
2313 unsigned long val;
2314
2315 if (tport->enable) {
2316 pr_err("Cannot change the directory_id on an active target.\n");
2317 return -EBUSY;
2318 }
2319
2320 if (strstr(page, "implicit") == page) {
2321 tport->directory_id = -1;
2322 } else {
2323 if (kstrtoul(page, 16, &val) < 0)
2324 return -EINVAL;
2325 if (val > 0xffffff)
2326 return -EINVAL;
2327
2328 tport->directory_id = val;
2329 }
2330
2331 return count;
2332 }
2333
2334 static ssize_t sbp_tpg_show_enable(
2335 struct se_portal_group *se_tpg,
2336 char *page)
2337 {
2338 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2339 struct sbp_tport *tport = tpg->tport;
2340 return sprintf(page, "%d\n", tport->enable);
2341 }
2342
2343 static ssize_t sbp_tpg_store_enable(
2344 struct se_portal_group *se_tpg,
2345 const char *page,
2346 size_t count)
2347 {
2348 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2349 struct sbp_tport *tport = tpg->tport;
2350 unsigned long val;
2351 int ret;
2352
2353 if (kstrtoul(page, 0, &val) < 0)
2354 return -EINVAL;
2355 if ((val != 0) && (val != 1))
2356 return -EINVAL;
2357
2358 if (tport->enable == val)
2359 return count;
2360
2361 if (val) {
2362 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) {
2363 pr_err("Cannot enable a target with no LUNs!\n");
2364 return -EINVAL;
2365 }
2366 } else {
2367 /* XXX: force-shutdown sessions instead? */
2368 spin_lock_bh(&se_tpg->session_lock);
2369 if (!list_empty(&se_tpg->tpg_sess_list)) {
2370 spin_unlock_bh(&se_tpg->session_lock);
2371 return -EBUSY;
2372 }
2373 spin_unlock_bh(&se_tpg->session_lock);
2374 }
2375
2376 tport->enable = val;
2377
2378 ret = sbp_update_unit_directory(tport);
2379 if (ret < 0) {
2380 pr_err("Could not update Config ROM\n");
2381 return ret;
2382 }
2383
2384 return count;
2385 }
2386
2387 TF_TPG_BASE_ATTR(sbp, directory_id, S_IRUGO | S_IWUSR);
2388 TF_TPG_BASE_ATTR(sbp, enable, S_IRUGO | S_IWUSR);
2389
2390 static struct configfs_attribute *sbp_tpg_base_attrs[] = {
2391 &sbp_tpg_directory_id.attr,
2392 &sbp_tpg_enable.attr,
2393 NULL,
2394 };
2395
2396 static ssize_t sbp_tpg_attrib_show_mgt_orb_timeout(
2397 struct se_portal_group *se_tpg,
2398 char *page)
2399 {
2400 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2401 struct sbp_tport *tport = tpg->tport;
2402 return sprintf(page, "%d\n", tport->mgt_orb_timeout);
2403 }
2404
2405 static ssize_t sbp_tpg_attrib_store_mgt_orb_timeout(
2406 struct se_portal_group *se_tpg,
2407 const char *page,
2408 size_t count)
2409 {
2410 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2411 struct sbp_tport *tport = tpg->tport;
2412 unsigned long val;
2413 int ret;
2414
2415 if (kstrtoul(page, 0, &val) < 0)
2416 return -EINVAL;
2417 if ((val < 1) || (val > 127))
2418 return -EINVAL;
2419
2420 if (tport->mgt_orb_timeout == val)
2421 return count;
2422
2423 tport->mgt_orb_timeout = val;
2424
2425 ret = sbp_update_unit_directory(tport);
2426 if (ret < 0)
2427 return ret;
2428
2429 return count;
2430 }
2431
2432 static ssize_t sbp_tpg_attrib_show_max_reconnect_timeout(
2433 struct se_portal_group *se_tpg,
2434 char *page)
2435 {
2436 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2437 struct sbp_tport *tport = tpg->tport;
2438 return sprintf(page, "%d\n", tport->max_reconnect_timeout);
2439 }
2440
2441 static ssize_t sbp_tpg_attrib_store_max_reconnect_timeout(
2442 struct se_portal_group *se_tpg,
2443 const char *page,
2444 size_t count)
2445 {
2446 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2447 struct sbp_tport *tport = tpg->tport;
2448 unsigned long val;
2449 int ret;
2450
2451 if (kstrtoul(page, 0, &val) < 0)
2452 return -EINVAL;
2453 if ((val < 1) || (val > 32767))
2454 return -EINVAL;
2455
2456 if (tport->max_reconnect_timeout == val)
2457 return count;
2458
2459 tport->max_reconnect_timeout = val;
2460
2461 ret = sbp_update_unit_directory(tport);
2462 if (ret < 0)
2463 return ret;
2464
2465 return count;
2466 }
2467
2468 static ssize_t sbp_tpg_attrib_show_max_logins_per_lun(
2469 struct se_portal_group *se_tpg,
2470 char *page)
2471 {
2472 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2473 struct sbp_tport *tport = tpg->tport;
2474 return sprintf(page, "%d\n", tport->max_logins_per_lun);
2475 }
2476
2477 static ssize_t sbp_tpg_attrib_store_max_logins_per_lun(
2478 struct se_portal_group *se_tpg,
2479 const char *page,
2480 size_t count)
2481 {
2482 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2483 struct sbp_tport *tport = tpg->tport;
2484 unsigned long val;
2485
2486 if (kstrtoul(page, 0, &val) < 0)
2487 return -EINVAL;
2488 if ((val < 1) || (val > 127))
2489 return -EINVAL;
2490
2491 /* XXX: also check against current count? */
2492
2493 tport->max_logins_per_lun = val;
2494
2495 return count;
2496 }
2497
2498 TF_TPG_ATTRIB_ATTR(sbp, mgt_orb_timeout, S_IRUGO | S_IWUSR);
2499 TF_TPG_ATTRIB_ATTR(sbp, max_reconnect_timeout, S_IRUGO | S_IWUSR);
2500 TF_TPG_ATTRIB_ATTR(sbp, max_logins_per_lun, S_IRUGO | S_IWUSR);
2501
2502 static struct configfs_attribute *sbp_tpg_attrib_attrs[] = {
2503 &sbp_tpg_attrib_mgt_orb_timeout.attr,
2504 &sbp_tpg_attrib_max_reconnect_timeout.attr,
2505 &sbp_tpg_attrib_max_logins_per_lun.attr,
2506 NULL,
2507 };
2508
2509 static struct target_core_fabric_ops sbp_ops = {
2510 .get_fabric_name = sbp_get_fabric_name,
2511 .get_fabric_proto_ident = sbp_get_fabric_proto_ident,
2512 .tpg_get_wwn = sbp_get_fabric_wwn,
2513 .tpg_get_tag = sbp_get_tag,
2514 .tpg_get_default_depth = sbp_get_default_depth,
2515 .tpg_get_pr_transport_id = sbp_get_pr_transport_id,
2516 .tpg_get_pr_transport_id_len = sbp_get_pr_transport_id_len,
2517 .tpg_parse_pr_out_transport_id = sbp_parse_pr_out_transport_id,
2518 .tpg_check_demo_mode = sbp_check_true,
2519 .tpg_check_demo_mode_cache = sbp_check_true,
2520 .tpg_check_demo_mode_write_protect = sbp_check_false,
2521 .tpg_check_prod_mode_write_protect = sbp_check_false,
2522 .tpg_alloc_fabric_acl = sbp_alloc_fabric_acl,
2523 .tpg_release_fabric_acl = sbp_release_fabric_acl,
2524 .tpg_get_inst_index = sbp_tpg_get_inst_index,
2525 .release_cmd = sbp_release_cmd,
2526 .shutdown_session = sbp_shutdown_session,
2527 .close_session = sbp_close_session,
2528 .sess_get_index = sbp_sess_get_index,
2529 .write_pending = sbp_write_pending,
2530 .write_pending_status = sbp_write_pending_status,
2531 .set_default_node_attributes = sbp_set_default_node_attrs,
2532 .get_task_tag = sbp_get_task_tag,
2533 .get_cmd_state = sbp_get_cmd_state,
2534 .queue_data_in = sbp_queue_data_in,
2535 .queue_status = sbp_queue_status,
2536 .queue_tm_rsp = sbp_queue_tm_rsp,
2537 .get_fabric_sense_len = sbp_get_fabric_sense_len,
2538 .set_fabric_sense_len = sbp_set_fabric_sense_len,
2539 .check_stop_free = sbp_check_stop_free,
2540
2541 .fabric_make_wwn = sbp_make_tport,
2542 .fabric_drop_wwn = sbp_drop_tport,
2543 .fabric_make_tpg = sbp_make_tpg,
2544 .fabric_drop_tpg = sbp_drop_tpg,
2545 .fabric_post_link = sbp_post_link_lun,
2546 .fabric_pre_unlink = sbp_pre_unlink_lun,
2547 .fabric_make_np = NULL,
2548 .fabric_drop_np = NULL,
2549 .fabric_make_nodeacl = sbp_make_nodeacl,
2550 .fabric_drop_nodeacl = sbp_drop_nodeacl,
2551 };
2552
2553 static int sbp_register_configfs(void)
2554 {
2555 struct target_fabric_configfs *fabric;
2556 int ret;
2557
2558 fabric = target_fabric_configfs_init(THIS_MODULE, "sbp");
2559 if (!fabric) {
2560 pr_err("target_fabric_configfs_init() failed\n");
2561 return -ENOMEM;
2562 }
2563
2564 fabric->tf_ops = sbp_ops;
2565
2566 /*
2567 * Setup default attribute lists for various fabric->tf_cit_tmpl
2568 */
2569 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = sbp_wwn_attrs;
2570 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = sbp_tpg_base_attrs;
2571 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = sbp_tpg_attrib_attrs;
2572 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
2573 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
2574 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2575 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2576 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2577 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
2578
2579 ret = target_fabric_configfs_register(fabric);
2580 if (ret < 0) {
2581 pr_err("target_fabric_configfs_register() failed for SBP\n");
2582 return ret;
2583 }
2584
2585 sbp_fabric_configfs = fabric;
2586
2587 return 0;
2588 };
2589
2590 static void sbp_deregister_configfs(void)
2591 {
2592 if (!sbp_fabric_configfs)
2593 return;
2594
2595 target_fabric_configfs_deregister(sbp_fabric_configfs);
2596 sbp_fabric_configfs = NULL;
2597 };
2598
2599 static int __init sbp_init(void)
2600 {
2601 int ret;
2602
2603 ret = sbp_register_configfs();
2604 if (ret < 0)
2605 return ret;
2606
2607 return 0;
2608 };
2609
2610 static void sbp_exit(void)
2611 {
2612 sbp_deregister_configfs();
2613 };
2614
2615 MODULE_DESCRIPTION("FireWire SBP fabric driver");
2616 MODULE_LICENSE("GPL");
2617 module_init(sbp_init);
2618 module_exit(sbp_exit);
Linux ARM platform port for MOXA ART SoC