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