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[mirror_ubuntu-hirsute-kernel.git] / drivers / target / sbp / sbp_target.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SBP2 target driver (SCSI over IEEE1394 in target mode)
4 *
5 * Copyright (C) 2011 Chris Boot <bootc@bootc.net>
6 */
7
8 #define KMSG_COMPONENT "sbp_target"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <linux/string.h>
16 #include <linux/configfs.h>
17 #include <linux/ctype.h>
18 #include <linux/delay.h>
19 #include <linux/firewire.h>
20 #include <linux/firewire-constants.h>
21 #include <scsi/scsi_proto.h>
22 #include <scsi/scsi_tcq.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_backend.h>
25 #include <target/target_core_fabric.h>
26 #include <asm/unaligned.h>
27
28 #include "sbp_target.h"
29
30 /* FireWire address region for management and command block address handlers */
31 static const struct fw_address_region sbp_register_region = {
32 .start = CSR_REGISTER_BASE + 0x10000,
33 .end = 0x1000000000000ULL,
34 };
35
36 static const u32 sbp_unit_directory_template[] = {
37 0x1200609e, /* unit_specifier_id: NCITS/T10 */
38 0x13010483, /* unit_sw_version: 1155D Rev 4 */
39 0x3800609e, /* command_set_specifier_id: NCITS/T10 */
40 0x390104d8, /* command_set: SPC-2 */
41 0x3b000000, /* command_set_revision: 0 */
42 0x3c000001, /* firmware_revision: 1 */
43 };
44
45 #define SESSION_MAINTENANCE_INTERVAL HZ
46
47 static atomic_t login_id = ATOMIC_INIT(0);
48
49 static void session_maintenance_work(struct work_struct *);
50 static int sbp_run_transaction(struct fw_card *, int, int, int, int,
51 unsigned long long, void *, size_t);
52
53 static int read_peer_guid(u64 *guid, const struct sbp_management_request *req)
54 {
55 int ret;
56 __be32 high, low;
57
58 ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
59 req->node_addr, req->generation, req->speed,
60 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 3 * 4,
61 &high, sizeof(high));
62 if (ret != RCODE_COMPLETE)
63 return ret;
64
65 ret = sbp_run_transaction(req->card, TCODE_READ_QUADLET_REQUEST,
66 req->node_addr, req->generation, req->speed,
67 (CSR_REGISTER_BASE | CSR_CONFIG_ROM) + 4 * 4,
68 &low, sizeof(low));
69 if (ret != RCODE_COMPLETE)
70 return ret;
71
72 *guid = (u64)be32_to_cpu(high) << 32 | be32_to_cpu(low);
73
74 return RCODE_COMPLETE;
75 }
76
77 static struct sbp_session *sbp_session_find_by_guid(
78 struct sbp_tpg *tpg, u64 guid)
79 {
80 struct se_session *se_sess;
81 struct sbp_session *sess, *found = NULL;
82
83 spin_lock_bh(&tpg->se_tpg.session_lock);
84 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
85 sess = se_sess->fabric_sess_ptr;
86 if (sess->guid == guid)
87 found = sess;
88 }
89 spin_unlock_bh(&tpg->se_tpg.session_lock);
90
91 return found;
92 }
93
94 static struct sbp_login_descriptor *sbp_login_find_by_lun(
95 struct sbp_session *session, u32 unpacked_lun)
96 {
97 struct sbp_login_descriptor *login, *found = NULL;
98
99 spin_lock_bh(&session->lock);
100 list_for_each_entry(login, &session->login_list, link) {
101 if (login->login_lun == unpacked_lun)
102 found = login;
103 }
104 spin_unlock_bh(&session->lock);
105
106 return found;
107 }
108
109 static int sbp_login_count_all_by_lun(
110 struct sbp_tpg *tpg,
111 u32 unpacked_lun,
112 int exclusive)
113 {
114 struct se_session *se_sess;
115 struct sbp_session *sess;
116 struct sbp_login_descriptor *login;
117 int count = 0;
118
119 spin_lock_bh(&tpg->se_tpg.session_lock);
120 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
121 sess = se_sess->fabric_sess_ptr;
122
123 spin_lock_bh(&sess->lock);
124 list_for_each_entry(login, &sess->login_list, link) {
125 if (login->login_lun != unpacked_lun)
126 continue;
127
128 if (!exclusive || login->exclusive)
129 count++;
130 }
131 spin_unlock_bh(&sess->lock);
132 }
133 spin_unlock_bh(&tpg->se_tpg.session_lock);
134
135 return count;
136 }
137
138 static struct sbp_login_descriptor *sbp_login_find_by_id(
139 struct sbp_tpg *tpg, int login_id)
140 {
141 struct se_session *se_sess;
142 struct sbp_session *sess;
143 struct sbp_login_descriptor *login, *found = NULL;
144
145 spin_lock_bh(&tpg->se_tpg.session_lock);
146 list_for_each_entry(se_sess, &tpg->se_tpg.tpg_sess_list, sess_list) {
147 sess = se_sess->fabric_sess_ptr;
148
149 spin_lock_bh(&sess->lock);
150 list_for_each_entry(login, &sess->login_list, link) {
151 if (login->login_id == login_id)
152 found = login;
153 }
154 spin_unlock_bh(&sess->lock);
155 }
156 spin_unlock_bh(&tpg->se_tpg.session_lock);
157
158 return found;
159 }
160
161 static u32 sbp_get_lun_from_tpg(struct sbp_tpg *tpg, u32 login_lun, int *err)
162 {
163 struct se_portal_group *se_tpg = &tpg->se_tpg;
164 struct se_lun *se_lun;
165
166 rcu_read_lock();
167 hlist_for_each_entry_rcu(se_lun, &se_tpg->tpg_lun_hlist, link) {
168 if (se_lun->unpacked_lun == login_lun) {
169 rcu_read_unlock();
170 *err = 0;
171 return login_lun;
172 }
173 }
174 rcu_read_unlock();
175
176 *err = -ENODEV;
177 return login_lun;
178 }
179
180 static struct sbp_session *sbp_session_create(
181 struct sbp_tpg *tpg,
182 u64 guid)
183 {
184 struct sbp_session *sess;
185 int ret;
186 char guid_str[17];
187
188 snprintf(guid_str, sizeof(guid_str), "%016llx", guid);
189
190 sess = kmalloc(sizeof(*sess), GFP_KERNEL);
191 if (!sess)
192 return ERR_PTR(-ENOMEM);
193
194 spin_lock_init(&sess->lock);
195 INIT_LIST_HEAD(&sess->login_list);
196 INIT_DELAYED_WORK(&sess->maint_work, session_maintenance_work);
197 sess->guid = guid;
198
199 sess->se_sess = target_setup_session(&tpg->se_tpg, 128,
200 sizeof(struct sbp_target_request),
201 TARGET_PROT_NORMAL, guid_str,
202 sess, NULL);
203 if (IS_ERR(sess->se_sess)) {
204 pr_err("failed to init se_session\n");
205 ret = PTR_ERR(sess->se_sess);
206 kfree(sess);
207 return ERR_PTR(ret);
208 }
209
210 return sess;
211 }
212
213 static void sbp_session_release(struct sbp_session *sess, bool cancel_work)
214 {
215 spin_lock_bh(&sess->lock);
216 if (!list_empty(&sess->login_list)) {
217 spin_unlock_bh(&sess->lock);
218 return;
219 }
220 spin_unlock_bh(&sess->lock);
221
222 if (cancel_work)
223 cancel_delayed_work_sync(&sess->maint_work);
224
225 target_remove_session(sess->se_sess);
226
227 if (sess->card)
228 fw_card_put(sess->card);
229
230 kfree(sess);
231 }
232
233 static void sbp_target_agent_unregister(struct sbp_target_agent *);
234
235 static void sbp_login_release(struct sbp_login_descriptor *login,
236 bool cancel_work)
237 {
238 struct sbp_session *sess = login->sess;
239
240 /* FIXME: abort/wait on tasks */
241
242 sbp_target_agent_unregister(login->tgt_agt);
243
244 if (sess) {
245 spin_lock_bh(&sess->lock);
246 list_del(&login->link);
247 spin_unlock_bh(&sess->lock);
248
249 sbp_session_release(sess, cancel_work);
250 }
251
252 kfree(login);
253 }
254
255 static struct sbp_target_agent *sbp_target_agent_register(
256 struct sbp_login_descriptor *);
257
258 static void sbp_management_request_login(
259 struct sbp_management_agent *agent, struct sbp_management_request *req,
260 int *status_data_size)
261 {
262 struct sbp_tport *tport = agent->tport;
263 struct sbp_tpg *tpg = tport->tpg;
264 struct sbp_session *sess;
265 struct sbp_login_descriptor *login;
266 struct sbp_login_response_block *response;
267 u64 guid;
268 u32 unpacked_lun;
269 int login_response_len, ret;
270
271 unpacked_lun = sbp_get_lun_from_tpg(tpg,
272 LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)), &ret);
273 if (ret) {
274 pr_notice("login to unknown LUN: %d\n",
275 LOGIN_ORB_LUN(be32_to_cpu(req->orb.misc)));
276
277 req->status.status = cpu_to_be32(
278 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
279 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LUN_NOTSUPP));
280 return;
281 }
282
283 ret = read_peer_guid(&guid, req);
284 if (ret != RCODE_COMPLETE) {
285 pr_warn("failed to read peer GUID: %d\n", ret);
286
287 req->status.status = cpu_to_be32(
288 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
289 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
290 return;
291 }
292
293 pr_notice("mgt_agent LOGIN to LUN %d from %016llx\n",
294 unpacked_lun, guid);
295
296 sess = sbp_session_find_by_guid(tpg, guid);
297 if (sess) {
298 login = sbp_login_find_by_lun(sess, unpacked_lun);
299 if (login) {
300 pr_notice("initiator already logged-in\n");
301
302 /*
303 * SBP-2 R4 says we should return access denied, but
304 * that can confuse initiators. Instead we need to
305 * treat this like a reconnect, but send the login
306 * response block like a fresh login.
307 *
308 * This is required particularly in the case of Apple
309 * devices booting off the FireWire target, where
310 * the firmware has an active login to the target. When
311 * the OS takes control of the session it issues its own
312 * LOGIN rather than a RECONNECT. To avoid the machine
313 * waiting until the reconnect_hold expires, we can skip
314 * the ACCESS_DENIED errors to speed things up.
315 */
316
317 goto already_logged_in;
318 }
319 }
320
321 /*
322 * check exclusive bit in login request
323 * reject with access_denied if any logins present
324 */
325 if (LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc)) &&
326 sbp_login_count_all_by_lun(tpg, unpacked_lun, 0)) {
327 pr_warn("refusing exclusive login with other active logins\n");
328
329 req->status.status = cpu_to_be32(
330 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
331 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
332 return;
333 }
334
335 /*
336 * check exclusive bit in any existing login descriptor
337 * reject with access_denied if any exclusive logins present
338 */
339 if (sbp_login_count_all_by_lun(tpg, unpacked_lun, 1)) {
340 pr_warn("refusing login while another exclusive login present\n");
341
342 req->status.status = cpu_to_be32(
343 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
344 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
345 return;
346 }
347
348 /*
349 * check we haven't exceeded the number of allowed logins
350 * reject with resources_unavailable if we have
351 */
352 if (sbp_login_count_all_by_lun(tpg, unpacked_lun, 0) >=
353 tport->max_logins_per_lun) {
354 pr_warn("max number of logins reached\n");
355
356 req->status.status = cpu_to_be32(
357 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
358 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
359 return;
360 }
361
362 if (!sess) {
363 sess = sbp_session_create(tpg, guid);
364 if (IS_ERR(sess)) {
365 switch (PTR_ERR(sess)) {
366 case -EPERM:
367 ret = SBP_STATUS_ACCESS_DENIED;
368 break;
369 default:
370 ret = SBP_STATUS_RESOURCES_UNAVAIL;
371 break;
372 }
373
374 req->status.status = cpu_to_be32(
375 STATUS_BLOCK_RESP(
376 STATUS_RESP_REQUEST_COMPLETE) |
377 STATUS_BLOCK_SBP_STATUS(ret));
378 return;
379 }
380
381 sess->node_id = req->node_addr;
382 sess->card = fw_card_get(req->card);
383 sess->generation = req->generation;
384 sess->speed = req->speed;
385
386 schedule_delayed_work(&sess->maint_work,
387 SESSION_MAINTENANCE_INTERVAL);
388 }
389
390 /* only take the latest reconnect_hold into account */
391 sess->reconnect_hold = min(
392 1 << LOGIN_ORB_RECONNECT(be32_to_cpu(req->orb.misc)),
393 tport->max_reconnect_timeout) - 1;
394
395 login = kmalloc(sizeof(*login), GFP_KERNEL);
396 if (!login) {
397 pr_err("failed to allocate login descriptor\n");
398
399 sbp_session_release(sess, true);
400
401 req->status.status = cpu_to_be32(
402 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
403 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
404 return;
405 }
406
407 login->sess = sess;
408 login->login_lun = unpacked_lun;
409 login->status_fifo_addr = sbp2_pointer_to_addr(&req->orb.status_fifo);
410 login->exclusive = LOGIN_ORB_EXCLUSIVE(be32_to_cpu(req->orb.misc));
411 login->login_id = atomic_inc_return(&login_id);
412
413 login->tgt_agt = sbp_target_agent_register(login);
414 if (IS_ERR(login->tgt_agt)) {
415 ret = PTR_ERR(login->tgt_agt);
416 pr_err("failed to map command block handler: %d\n", ret);
417
418 sbp_session_release(sess, true);
419 kfree(login);
420
421 req->status.status = cpu_to_be32(
422 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
423 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
424 return;
425 }
426
427 spin_lock_bh(&sess->lock);
428 list_add_tail(&login->link, &sess->login_list);
429 spin_unlock_bh(&sess->lock);
430
431 already_logged_in:
432 response = kzalloc(sizeof(*response), GFP_KERNEL);
433 if (!response) {
434 pr_err("failed to allocate login response block\n");
435
436 sbp_login_release(login, true);
437
438 req->status.status = cpu_to_be32(
439 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
440 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_RESOURCES_UNAVAIL));
441 return;
442 }
443
444 login_response_len = clamp_val(
445 LOGIN_ORB_RESPONSE_LENGTH(be32_to_cpu(req->orb.length)),
446 12, sizeof(*response));
447 response->misc = cpu_to_be32(
448 ((login_response_len & 0xffff) << 16) |
449 (login->login_id & 0xffff));
450 response->reconnect_hold = cpu_to_be32(sess->reconnect_hold & 0xffff);
451 addr_to_sbp2_pointer(login->tgt_agt->handler.offset,
452 &response->command_block_agent);
453
454 ret = sbp_run_transaction(sess->card, TCODE_WRITE_BLOCK_REQUEST,
455 sess->node_id, sess->generation, sess->speed,
456 sbp2_pointer_to_addr(&req->orb.ptr2), response,
457 login_response_len);
458 if (ret != RCODE_COMPLETE) {
459 pr_debug("failed to write login response block: %x\n", ret);
460
461 kfree(response);
462 sbp_login_release(login, true);
463
464 req->status.status = cpu_to_be32(
465 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
466 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
467 return;
468 }
469
470 kfree(response);
471
472 req->status.status = cpu_to_be32(
473 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
474 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
475 }
476
477 static void sbp_management_request_query_logins(
478 struct sbp_management_agent *agent, struct sbp_management_request *req,
479 int *status_data_size)
480 {
481 pr_notice("QUERY LOGINS not implemented\n");
482 /* FIXME: implement */
483
484 req->status.status = cpu_to_be32(
485 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
486 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
487 }
488
489 static void sbp_management_request_reconnect(
490 struct sbp_management_agent *agent, struct sbp_management_request *req,
491 int *status_data_size)
492 {
493 struct sbp_tport *tport = agent->tport;
494 struct sbp_tpg *tpg = tport->tpg;
495 int ret;
496 u64 guid;
497 struct sbp_login_descriptor *login;
498
499 ret = read_peer_guid(&guid, req);
500 if (ret != RCODE_COMPLETE) {
501 pr_warn("failed to read peer GUID: %d\n", ret);
502
503 req->status.status = cpu_to_be32(
504 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
505 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
506 return;
507 }
508
509 pr_notice("mgt_agent RECONNECT from %016llx\n", guid);
510
511 login = sbp_login_find_by_id(tpg,
512 RECONNECT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc)));
513
514 if (!login) {
515 pr_err("mgt_agent RECONNECT unknown login ID\n");
516
517 req->status.status = cpu_to_be32(
518 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
519 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
520 return;
521 }
522
523 if (login->sess->guid != guid) {
524 pr_err("mgt_agent RECONNECT login GUID doesn't match\n");
525
526 req->status.status = cpu_to_be32(
527 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
528 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
529 return;
530 }
531
532 spin_lock_bh(&login->sess->lock);
533 if (login->sess->card)
534 fw_card_put(login->sess->card);
535
536 /* update the node details */
537 login->sess->generation = req->generation;
538 login->sess->node_id = req->node_addr;
539 login->sess->card = fw_card_get(req->card);
540 login->sess->speed = req->speed;
541 spin_unlock_bh(&login->sess->lock);
542
543 req->status.status = cpu_to_be32(
544 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
545 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
546 }
547
548 static void sbp_management_request_logout(
549 struct sbp_management_agent *agent, struct sbp_management_request *req,
550 int *status_data_size)
551 {
552 struct sbp_tport *tport = agent->tport;
553 struct sbp_tpg *tpg = tport->tpg;
554 int id;
555 struct sbp_login_descriptor *login;
556
557 id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc));
558
559 login = sbp_login_find_by_id(tpg, id);
560 if (!login) {
561 pr_warn("cannot find login: %d\n", id);
562
563 req->status.status = cpu_to_be32(
564 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
565 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_LOGIN_ID_UNKNOWN));
566 return;
567 }
568
569 pr_info("mgt_agent LOGOUT from LUN %d session %d\n",
570 login->login_lun, login->login_id);
571
572 if (req->node_addr != login->sess->node_id) {
573 pr_warn("logout from different node ID\n");
574
575 req->status.status = cpu_to_be32(
576 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
577 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_ACCESS_DENIED));
578 return;
579 }
580
581 sbp_login_release(login, true);
582
583 req->status.status = cpu_to_be32(
584 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
585 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
586 }
587
588 static void session_check_for_reset(struct sbp_session *sess)
589 {
590 bool card_valid = false;
591
592 spin_lock_bh(&sess->lock);
593
594 if (sess->card) {
595 spin_lock_irq(&sess->card->lock);
596 card_valid = (sess->card->local_node != NULL);
597 spin_unlock_irq(&sess->card->lock);
598
599 if (!card_valid) {
600 fw_card_put(sess->card);
601 sess->card = NULL;
602 }
603 }
604
605 if (!card_valid || (sess->generation != sess->card->generation)) {
606 pr_info("Waiting for reconnect from node: %016llx\n",
607 sess->guid);
608
609 sess->node_id = -1;
610 sess->reconnect_expires = get_jiffies_64() +
611 ((sess->reconnect_hold + 1) * HZ);
612 }
613
614 spin_unlock_bh(&sess->lock);
615 }
616
617 static void session_reconnect_expired(struct sbp_session *sess)
618 {
619 struct sbp_login_descriptor *login, *temp;
620 LIST_HEAD(login_list);
621
622 pr_info("Reconnect timer expired for node: %016llx\n", sess->guid);
623
624 spin_lock_bh(&sess->lock);
625 list_for_each_entry_safe(login, temp, &sess->login_list, link) {
626 login->sess = NULL;
627 list_move_tail(&login->link, &login_list);
628 }
629 spin_unlock_bh(&sess->lock);
630
631 list_for_each_entry_safe(login, temp, &login_list, link) {
632 list_del(&login->link);
633 sbp_login_release(login, false);
634 }
635
636 sbp_session_release(sess, false);
637 }
638
639 static void session_maintenance_work(struct work_struct *work)
640 {
641 struct sbp_session *sess = container_of(work, struct sbp_session,
642 maint_work.work);
643
644 /* could be called while tearing down the session */
645 spin_lock_bh(&sess->lock);
646 if (list_empty(&sess->login_list)) {
647 spin_unlock_bh(&sess->lock);
648 return;
649 }
650 spin_unlock_bh(&sess->lock);
651
652 if (sess->node_id != -1) {
653 /* check for bus reset and make node_id invalid */
654 session_check_for_reset(sess);
655
656 schedule_delayed_work(&sess->maint_work,
657 SESSION_MAINTENANCE_INTERVAL);
658 } else if (!time_after64(get_jiffies_64(), sess->reconnect_expires)) {
659 /* still waiting for reconnect */
660 schedule_delayed_work(&sess->maint_work,
661 SESSION_MAINTENANCE_INTERVAL);
662 } else {
663 /* reconnect timeout has expired */
664 session_reconnect_expired(sess);
665 }
666 }
667
668 static int tgt_agent_rw_agent_state(struct fw_card *card, int tcode, void *data,
669 struct sbp_target_agent *agent)
670 {
671 int state;
672
673 switch (tcode) {
674 case TCODE_READ_QUADLET_REQUEST:
675 pr_debug("tgt_agent AGENT_STATE READ\n");
676
677 spin_lock_bh(&agent->lock);
678 state = agent->state;
679 spin_unlock_bh(&agent->lock);
680
681 *(__be32 *)data = cpu_to_be32(state);
682
683 return RCODE_COMPLETE;
684
685 case TCODE_WRITE_QUADLET_REQUEST:
686 /* ignored */
687 return RCODE_COMPLETE;
688
689 default:
690 return RCODE_TYPE_ERROR;
691 }
692 }
693
694 static int tgt_agent_rw_agent_reset(struct fw_card *card, int tcode, void *data,
695 struct sbp_target_agent *agent)
696 {
697 switch (tcode) {
698 case TCODE_WRITE_QUADLET_REQUEST:
699 pr_debug("tgt_agent AGENT_RESET\n");
700 spin_lock_bh(&agent->lock);
701 agent->state = AGENT_STATE_RESET;
702 spin_unlock_bh(&agent->lock);
703 return RCODE_COMPLETE;
704
705 default:
706 return RCODE_TYPE_ERROR;
707 }
708 }
709
710 static int tgt_agent_rw_orb_pointer(struct fw_card *card, int tcode, void *data,
711 struct sbp_target_agent *agent)
712 {
713 struct sbp2_pointer *ptr = data;
714
715 switch (tcode) {
716 case TCODE_WRITE_BLOCK_REQUEST:
717 spin_lock_bh(&agent->lock);
718 if (agent->state != AGENT_STATE_SUSPENDED &&
719 agent->state != AGENT_STATE_RESET) {
720 spin_unlock_bh(&agent->lock);
721 pr_notice("Ignoring ORB_POINTER write while active.\n");
722 return RCODE_CONFLICT_ERROR;
723 }
724 agent->state = AGENT_STATE_ACTIVE;
725 spin_unlock_bh(&agent->lock);
726
727 agent->orb_pointer = sbp2_pointer_to_addr(ptr);
728 agent->doorbell = false;
729
730 pr_debug("tgt_agent ORB_POINTER write: 0x%llx\n",
731 agent->orb_pointer);
732
733 queue_work(system_unbound_wq, &agent->work);
734
735 return RCODE_COMPLETE;
736
737 case TCODE_READ_BLOCK_REQUEST:
738 pr_debug("tgt_agent ORB_POINTER READ\n");
739 spin_lock_bh(&agent->lock);
740 addr_to_sbp2_pointer(agent->orb_pointer, ptr);
741 spin_unlock_bh(&agent->lock);
742 return RCODE_COMPLETE;
743
744 default:
745 return RCODE_TYPE_ERROR;
746 }
747 }
748
749 static int tgt_agent_rw_doorbell(struct fw_card *card, int tcode, void *data,
750 struct sbp_target_agent *agent)
751 {
752 switch (tcode) {
753 case TCODE_WRITE_QUADLET_REQUEST:
754 spin_lock_bh(&agent->lock);
755 if (agent->state != AGENT_STATE_SUSPENDED) {
756 spin_unlock_bh(&agent->lock);
757 pr_debug("Ignoring DOORBELL while active.\n");
758 return RCODE_CONFLICT_ERROR;
759 }
760 agent->state = AGENT_STATE_ACTIVE;
761 spin_unlock_bh(&agent->lock);
762
763 agent->doorbell = true;
764
765 pr_debug("tgt_agent DOORBELL\n");
766
767 queue_work(system_unbound_wq, &agent->work);
768
769 return RCODE_COMPLETE;
770
771 case TCODE_READ_QUADLET_REQUEST:
772 return RCODE_COMPLETE;
773
774 default:
775 return RCODE_TYPE_ERROR;
776 }
777 }
778
779 static int tgt_agent_rw_unsolicited_status_enable(struct fw_card *card,
780 int tcode, void *data, struct sbp_target_agent *agent)
781 {
782 switch (tcode) {
783 case TCODE_WRITE_QUADLET_REQUEST:
784 pr_debug("tgt_agent UNSOLICITED_STATUS_ENABLE\n");
785 /* ignored as we don't send unsolicited status */
786 return RCODE_COMPLETE;
787
788 case TCODE_READ_QUADLET_REQUEST:
789 return RCODE_COMPLETE;
790
791 default:
792 return RCODE_TYPE_ERROR;
793 }
794 }
795
796 static void tgt_agent_rw(struct fw_card *card, struct fw_request *request,
797 int tcode, int destination, int source, int generation,
798 unsigned long long offset, void *data, size_t length,
799 void *callback_data)
800 {
801 struct sbp_target_agent *agent = callback_data;
802 struct sbp_session *sess = agent->login->sess;
803 int sess_gen, sess_node, rcode;
804
805 spin_lock_bh(&sess->lock);
806 sess_gen = sess->generation;
807 sess_node = sess->node_id;
808 spin_unlock_bh(&sess->lock);
809
810 if (generation != sess_gen) {
811 pr_notice("ignoring request with wrong generation\n");
812 rcode = RCODE_TYPE_ERROR;
813 goto out;
814 }
815
816 if (source != sess_node) {
817 pr_notice("ignoring request from foreign node (%x != %x)\n",
818 source, sess_node);
819 rcode = RCODE_TYPE_ERROR;
820 goto out;
821 }
822
823 /* turn offset into the offset from the start of the block */
824 offset -= agent->handler.offset;
825
826 if (offset == 0x00 && length == 4) {
827 /* AGENT_STATE */
828 rcode = tgt_agent_rw_agent_state(card, tcode, data, agent);
829 } else if (offset == 0x04 && length == 4) {
830 /* AGENT_RESET */
831 rcode = tgt_agent_rw_agent_reset(card, tcode, data, agent);
832 } else if (offset == 0x08 && length == 8) {
833 /* ORB_POINTER */
834 rcode = tgt_agent_rw_orb_pointer(card, tcode, data, agent);
835 } else if (offset == 0x10 && length == 4) {
836 /* DOORBELL */
837 rcode = tgt_agent_rw_doorbell(card, tcode, data, agent);
838 } else if (offset == 0x14 && length == 4) {
839 /* UNSOLICITED_STATUS_ENABLE */
840 rcode = tgt_agent_rw_unsolicited_status_enable(card, tcode,
841 data, agent);
842 } else {
843 rcode = RCODE_ADDRESS_ERROR;
844 }
845
846 out:
847 fw_send_response(card, request, rcode);
848 }
849
850 static void sbp_handle_command(struct sbp_target_request *);
851 static int sbp_send_status(struct sbp_target_request *);
852 static void sbp_free_request(struct sbp_target_request *);
853
854 static void tgt_agent_process_work(struct work_struct *work)
855 {
856 struct sbp_target_request *req =
857 container_of(work, struct sbp_target_request, work);
858
859 pr_debug("tgt_orb ptr:0x%llx next_ORB:0x%llx data_descriptor:0x%llx misc:0x%x\n",
860 req->orb_pointer,
861 sbp2_pointer_to_addr(&req->orb.next_orb),
862 sbp2_pointer_to_addr(&req->orb.data_descriptor),
863 be32_to_cpu(req->orb.misc));
864
865 if (req->orb_pointer >> 32)
866 pr_debug("ORB with high bits set\n");
867
868 switch (ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc))) {
869 case 0:/* Format specified by this standard */
870 sbp_handle_command(req);
871 return;
872 case 1: /* Reserved for future standardization */
873 case 2: /* Vendor-dependent */
874 req->status.status |= cpu_to_be32(
875 STATUS_BLOCK_RESP(
876 STATUS_RESP_REQUEST_COMPLETE) |
877 STATUS_BLOCK_DEAD(0) |
878 STATUS_BLOCK_LEN(1) |
879 STATUS_BLOCK_SBP_STATUS(
880 SBP_STATUS_REQ_TYPE_NOTSUPP));
881 sbp_send_status(req);
882 return;
883 case 3: /* Dummy ORB */
884 req->status.status |= cpu_to_be32(
885 STATUS_BLOCK_RESP(
886 STATUS_RESP_REQUEST_COMPLETE) |
887 STATUS_BLOCK_DEAD(0) |
888 STATUS_BLOCK_LEN(1) |
889 STATUS_BLOCK_SBP_STATUS(
890 SBP_STATUS_DUMMY_ORB_COMPLETE));
891 sbp_send_status(req);
892 return;
893 default:
894 BUG();
895 }
896 }
897
898 /* used to double-check we haven't been issued an AGENT_RESET */
899 static inline bool tgt_agent_check_active(struct sbp_target_agent *agent)
900 {
901 bool active;
902
903 spin_lock_bh(&agent->lock);
904 active = (agent->state == AGENT_STATE_ACTIVE);
905 spin_unlock_bh(&agent->lock);
906
907 return active;
908 }
909
910 static struct sbp_target_request *sbp_mgt_get_req(struct sbp_session *sess,
911 struct fw_card *card, u64 next_orb)
912 {
913 struct se_session *se_sess = sess->se_sess;
914 struct sbp_target_request *req;
915 int tag, cpu;
916
917 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
918 if (tag < 0)
919 return ERR_PTR(-ENOMEM);
920
921 req = &((struct sbp_target_request *)se_sess->sess_cmd_map)[tag];
922 memset(req, 0, sizeof(*req));
923 req->se_cmd.map_tag = tag;
924 req->se_cmd.map_cpu = cpu;
925 req->se_cmd.tag = next_orb;
926
927 return req;
928 }
929
930 static void tgt_agent_fetch_work(struct work_struct *work)
931 {
932 struct sbp_target_agent *agent =
933 container_of(work, struct sbp_target_agent, work);
934 struct sbp_session *sess = agent->login->sess;
935 struct sbp_target_request *req;
936 int ret;
937 bool doorbell = agent->doorbell;
938 u64 next_orb = agent->orb_pointer;
939
940 while (next_orb && tgt_agent_check_active(agent)) {
941 req = sbp_mgt_get_req(sess, sess->card, next_orb);
942 if (IS_ERR(req)) {
943 spin_lock_bh(&agent->lock);
944 agent->state = AGENT_STATE_DEAD;
945 spin_unlock_bh(&agent->lock);
946 return;
947 }
948
949 req->login = agent->login;
950 req->orb_pointer = next_orb;
951
952 req->status.status = cpu_to_be32(STATUS_BLOCK_ORB_OFFSET_HIGH(
953 req->orb_pointer >> 32));
954 req->status.orb_low = cpu_to_be32(
955 req->orb_pointer & 0xfffffffc);
956
957 /* read in the ORB */
958 ret = sbp_run_transaction(sess->card, TCODE_READ_BLOCK_REQUEST,
959 sess->node_id, sess->generation, sess->speed,
960 req->orb_pointer, &req->orb, sizeof(req->orb));
961 if (ret != RCODE_COMPLETE) {
962 pr_debug("tgt_orb fetch failed: %x\n", ret);
963 req->status.status |= cpu_to_be32(
964 STATUS_BLOCK_SRC(
965 STATUS_SRC_ORB_FINISHED) |
966 STATUS_BLOCK_RESP(
967 STATUS_RESP_TRANSPORT_FAILURE) |
968 STATUS_BLOCK_DEAD(1) |
969 STATUS_BLOCK_LEN(1) |
970 STATUS_BLOCK_SBP_STATUS(
971 SBP_STATUS_UNSPECIFIED_ERROR));
972 spin_lock_bh(&agent->lock);
973 agent->state = AGENT_STATE_DEAD;
974 spin_unlock_bh(&agent->lock);
975
976 sbp_send_status(req);
977 return;
978 }
979
980 /* check the next_ORB field */
981 if (be32_to_cpu(req->orb.next_orb.high) & 0x80000000) {
982 next_orb = 0;
983 req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
984 STATUS_SRC_ORB_FINISHED));
985 } else {
986 next_orb = sbp2_pointer_to_addr(&req->orb.next_orb);
987 req->status.status |= cpu_to_be32(STATUS_BLOCK_SRC(
988 STATUS_SRC_ORB_CONTINUING));
989 }
990
991 if (tgt_agent_check_active(agent) && !doorbell) {
992 INIT_WORK(&req->work, tgt_agent_process_work);
993 queue_work(system_unbound_wq, &req->work);
994 } else {
995 /* don't process this request, just check next_ORB */
996 sbp_free_request(req);
997 }
998
999 spin_lock_bh(&agent->lock);
1000 doorbell = agent->doorbell = false;
1001
1002 /* check if we should carry on processing */
1003 if (next_orb)
1004 agent->orb_pointer = next_orb;
1005 else
1006 agent->state = AGENT_STATE_SUSPENDED;
1007
1008 spin_unlock_bh(&agent->lock);
1009 };
1010 }
1011
1012 static struct sbp_target_agent *sbp_target_agent_register(
1013 struct sbp_login_descriptor *login)
1014 {
1015 struct sbp_target_agent *agent;
1016 int ret;
1017
1018 agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1019 if (!agent)
1020 return ERR_PTR(-ENOMEM);
1021
1022 spin_lock_init(&agent->lock);
1023
1024 agent->handler.length = 0x20;
1025 agent->handler.address_callback = tgt_agent_rw;
1026 agent->handler.callback_data = agent;
1027
1028 agent->login = login;
1029 agent->state = AGENT_STATE_RESET;
1030 INIT_WORK(&agent->work, tgt_agent_fetch_work);
1031 agent->orb_pointer = 0;
1032 agent->doorbell = false;
1033
1034 ret = fw_core_add_address_handler(&agent->handler,
1035 &sbp_register_region);
1036 if (ret < 0) {
1037 kfree(agent);
1038 return ERR_PTR(ret);
1039 }
1040
1041 return agent;
1042 }
1043
1044 static void sbp_target_agent_unregister(struct sbp_target_agent *agent)
1045 {
1046 fw_core_remove_address_handler(&agent->handler);
1047 cancel_work_sync(&agent->work);
1048 kfree(agent);
1049 }
1050
1051 /*
1052 * Simple wrapper around fw_run_transaction that retries the transaction several
1053 * times in case of failure, with an exponential backoff.
1054 */
1055 static int sbp_run_transaction(struct fw_card *card, int tcode, int destination_id,
1056 int generation, int speed, unsigned long long offset,
1057 void *payload, size_t length)
1058 {
1059 int attempt, ret, delay;
1060
1061 for (attempt = 1; attempt <= 5; attempt++) {
1062 ret = fw_run_transaction(card, tcode, destination_id,
1063 generation, speed, offset, payload, length);
1064
1065 switch (ret) {
1066 case RCODE_COMPLETE:
1067 case RCODE_TYPE_ERROR:
1068 case RCODE_ADDRESS_ERROR:
1069 case RCODE_GENERATION:
1070 return ret;
1071
1072 default:
1073 delay = 5 * attempt * attempt;
1074 usleep_range(delay, delay * 2);
1075 }
1076 }
1077
1078 return ret;
1079 }
1080
1081 /*
1082 * Wrapper around sbp_run_transaction that gets the card, destination,
1083 * generation and speed out of the request's session.
1084 */
1085 static int sbp_run_request_transaction(struct sbp_target_request *req,
1086 int tcode, unsigned long long offset, void *payload,
1087 size_t length)
1088 {
1089 struct sbp_login_descriptor *login = req->login;
1090 struct sbp_session *sess = login->sess;
1091 struct fw_card *card;
1092 int node_id, generation, speed, ret;
1093
1094 spin_lock_bh(&sess->lock);
1095 card = fw_card_get(sess->card);
1096 node_id = sess->node_id;
1097 generation = sess->generation;
1098 speed = sess->speed;
1099 spin_unlock_bh(&sess->lock);
1100
1101 ret = sbp_run_transaction(card, tcode, node_id, generation, speed,
1102 offset, payload, length);
1103
1104 fw_card_put(card);
1105
1106 return ret;
1107 }
1108
1109 static int sbp_fetch_command(struct sbp_target_request *req)
1110 {
1111 int ret, cmd_len, copy_len;
1112
1113 cmd_len = scsi_command_size(req->orb.command_block);
1114
1115 req->cmd_buf = kmalloc(cmd_len, GFP_KERNEL);
1116 if (!req->cmd_buf)
1117 return -ENOMEM;
1118
1119 memcpy(req->cmd_buf, req->orb.command_block,
1120 min_t(int, cmd_len, sizeof(req->orb.command_block)));
1121
1122 if (cmd_len > sizeof(req->orb.command_block)) {
1123 pr_debug("sbp_fetch_command: filling in long command\n");
1124 copy_len = cmd_len - sizeof(req->orb.command_block);
1125
1126 ret = sbp_run_request_transaction(req,
1127 TCODE_READ_BLOCK_REQUEST,
1128 req->orb_pointer + sizeof(req->orb),
1129 req->cmd_buf + sizeof(req->orb.command_block),
1130 copy_len);
1131 if (ret != RCODE_COMPLETE)
1132 return -EIO;
1133 }
1134
1135 return 0;
1136 }
1137
1138 static int sbp_fetch_page_table(struct sbp_target_request *req)
1139 {
1140 int pg_tbl_sz, ret;
1141 struct sbp_page_table_entry *pg_tbl;
1142
1143 if (!CMDBLK_ORB_PG_TBL_PRESENT(be32_to_cpu(req->orb.misc)))
1144 return 0;
1145
1146 pg_tbl_sz = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc)) *
1147 sizeof(struct sbp_page_table_entry);
1148
1149 pg_tbl = kmalloc(pg_tbl_sz, GFP_KERNEL);
1150 if (!pg_tbl)
1151 return -ENOMEM;
1152
1153 ret = sbp_run_request_transaction(req, TCODE_READ_BLOCK_REQUEST,
1154 sbp2_pointer_to_addr(&req->orb.data_descriptor),
1155 pg_tbl, pg_tbl_sz);
1156 if (ret != RCODE_COMPLETE) {
1157 kfree(pg_tbl);
1158 return -EIO;
1159 }
1160
1161 req->pg_tbl = pg_tbl;
1162 return 0;
1163 }
1164
1165 static void sbp_calc_data_length_direction(struct sbp_target_request *req,
1166 u32 *data_len, enum dma_data_direction *data_dir)
1167 {
1168 int data_size, direction, idx;
1169
1170 data_size = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1171 direction = CMDBLK_ORB_DIRECTION(be32_to_cpu(req->orb.misc));
1172
1173 if (!data_size) {
1174 *data_len = 0;
1175 *data_dir = DMA_NONE;
1176 return;
1177 }
1178
1179 *data_dir = direction ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1180
1181 if (req->pg_tbl) {
1182 *data_len = 0;
1183 for (idx = 0; idx < data_size; idx++) {
1184 *data_len += be16_to_cpu(
1185 req->pg_tbl[idx].segment_length);
1186 }
1187 } else {
1188 *data_len = data_size;
1189 }
1190 }
1191
1192 static void sbp_handle_command(struct sbp_target_request *req)
1193 {
1194 struct sbp_login_descriptor *login = req->login;
1195 struct sbp_session *sess = login->sess;
1196 int ret, unpacked_lun;
1197 u32 data_length;
1198 enum dma_data_direction data_dir;
1199
1200 ret = sbp_fetch_command(req);
1201 if (ret) {
1202 pr_debug("sbp_handle_command: fetch command failed: %d\n", ret);
1203 goto err;
1204 }
1205
1206 ret = sbp_fetch_page_table(req);
1207 if (ret) {
1208 pr_debug("sbp_handle_command: fetch page table failed: %d\n",
1209 ret);
1210 goto err;
1211 }
1212
1213 unpacked_lun = req->login->login_lun;
1214 sbp_calc_data_length_direction(req, &data_length, &data_dir);
1215
1216 pr_debug("sbp_handle_command ORB:0x%llx unpacked_lun:%d data_len:%d data_dir:%d\n",
1217 req->orb_pointer, unpacked_lun, data_length, data_dir);
1218
1219 /* only used for printk until we do TMRs */
1220 req->se_cmd.tag = req->orb_pointer;
1221 if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf,
1222 req->sense_buf, unpacked_lun, data_length,
1223 TCM_SIMPLE_TAG, data_dir, TARGET_SCF_ACK_KREF))
1224 goto err;
1225
1226 return;
1227
1228 err:
1229 req->status.status |= cpu_to_be32(
1230 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1231 STATUS_BLOCK_DEAD(0) |
1232 STATUS_BLOCK_LEN(1) |
1233 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1234 sbp_send_status(req);
1235 }
1236
1237 /*
1238 * DMA_TO_DEVICE = read from initiator (SCSI WRITE)
1239 * DMA_FROM_DEVICE = write to initiator (SCSI READ)
1240 */
1241 static int sbp_rw_data(struct sbp_target_request *req)
1242 {
1243 struct sbp_session *sess = req->login->sess;
1244 int tcode, sg_miter_flags, max_payload, pg_size, speed, node_id,
1245 generation, num_pte, length, tfr_length,
1246 rcode = RCODE_COMPLETE;
1247 struct sbp_page_table_entry *pte;
1248 unsigned long long offset;
1249 struct fw_card *card;
1250 struct sg_mapping_iter iter;
1251
1252 if (req->se_cmd.data_direction == DMA_FROM_DEVICE) {
1253 tcode = TCODE_WRITE_BLOCK_REQUEST;
1254 sg_miter_flags = SG_MITER_FROM_SG;
1255 } else {
1256 tcode = TCODE_READ_BLOCK_REQUEST;
1257 sg_miter_flags = SG_MITER_TO_SG;
1258 }
1259
1260 max_payload = 4 << CMDBLK_ORB_MAX_PAYLOAD(be32_to_cpu(req->orb.misc));
1261 speed = CMDBLK_ORB_SPEED(be32_to_cpu(req->orb.misc));
1262
1263 pg_size = CMDBLK_ORB_PG_SIZE(be32_to_cpu(req->orb.misc));
1264 if (pg_size) {
1265 pr_err("sbp_run_transaction: page size ignored\n");
1266 pg_size = 0x100 << pg_size;
1267 }
1268
1269 spin_lock_bh(&sess->lock);
1270 card = fw_card_get(sess->card);
1271 node_id = sess->node_id;
1272 generation = sess->generation;
1273 spin_unlock_bh(&sess->lock);
1274
1275 if (req->pg_tbl) {
1276 pte = req->pg_tbl;
1277 num_pte = CMDBLK_ORB_DATA_SIZE(be32_to_cpu(req->orb.misc));
1278
1279 offset = 0;
1280 length = 0;
1281 } else {
1282 pte = NULL;
1283 num_pte = 0;
1284
1285 offset = sbp2_pointer_to_addr(&req->orb.data_descriptor);
1286 length = req->se_cmd.data_length;
1287 }
1288
1289 sg_miter_start(&iter, req->se_cmd.t_data_sg, req->se_cmd.t_data_nents,
1290 sg_miter_flags);
1291
1292 while (length || num_pte) {
1293 if (!length) {
1294 offset = (u64)be16_to_cpu(pte->segment_base_hi) << 32 |
1295 be32_to_cpu(pte->segment_base_lo);
1296 length = be16_to_cpu(pte->segment_length);
1297
1298 pte++;
1299 num_pte--;
1300 }
1301
1302 sg_miter_next(&iter);
1303
1304 tfr_length = min3(length, max_payload, (int)iter.length);
1305
1306 /* FIXME: take page_size into account */
1307
1308 rcode = sbp_run_transaction(card, tcode, node_id,
1309 generation, speed,
1310 offset, iter.addr, tfr_length);
1311
1312 if (rcode != RCODE_COMPLETE)
1313 break;
1314
1315 length -= tfr_length;
1316 offset += tfr_length;
1317 iter.consumed = tfr_length;
1318 }
1319
1320 sg_miter_stop(&iter);
1321 fw_card_put(card);
1322
1323 if (rcode == RCODE_COMPLETE) {
1324 WARN_ON(length != 0);
1325 return 0;
1326 } else {
1327 return -EIO;
1328 }
1329 }
1330
1331 static int sbp_send_status(struct sbp_target_request *req)
1332 {
1333 int rc, ret = 0, length;
1334 struct sbp_login_descriptor *login = req->login;
1335
1336 length = (((be32_to_cpu(req->status.status) >> 24) & 0x07) + 1) * 4;
1337
1338 rc = sbp_run_request_transaction(req, TCODE_WRITE_BLOCK_REQUEST,
1339 login->status_fifo_addr, &req->status, length);
1340 if (rc != RCODE_COMPLETE) {
1341 pr_debug("sbp_send_status: write failed: 0x%x\n", rc);
1342 ret = -EIO;
1343 goto put_ref;
1344 }
1345
1346 pr_debug("sbp_send_status: status write complete for ORB: 0x%llx\n",
1347 req->orb_pointer);
1348 /*
1349 * Drop the extra ACK_KREF reference taken by target_submit_cmd()
1350 * ahead of sbp_check_stop_free() -> transport_generic_free_cmd()
1351 * final se_cmd->cmd_kref put.
1352 */
1353 put_ref:
1354 target_put_sess_cmd(&req->se_cmd);
1355 return ret;
1356 }
1357
1358 static void sbp_sense_mangle(struct sbp_target_request *req)
1359 {
1360 struct se_cmd *se_cmd = &req->se_cmd;
1361 u8 *sense = req->sense_buf;
1362 u8 *status = req->status.data;
1363
1364 WARN_ON(se_cmd->scsi_sense_length < 18);
1365
1366 switch (sense[0] & 0x7f) { /* sfmt */
1367 case 0x70: /* current, fixed */
1368 status[0] = 0 << 6;
1369 break;
1370 case 0x71: /* deferred, fixed */
1371 status[0] = 1 << 6;
1372 break;
1373 case 0x72: /* current, descriptor */
1374 case 0x73: /* deferred, descriptor */
1375 default:
1376 /*
1377 * TODO: SBP-3 specifies what we should do with descriptor
1378 * format sense data
1379 */
1380 pr_err("sbp_send_sense: unknown sense format: 0x%x\n",
1381 sense[0]);
1382 req->status.status |= cpu_to_be32(
1383 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1384 STATUS_BLOCK_DEAD(0) |
1385 STATUS_BLOCK_LEN(1) |
1386 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQUEST_ABORTED));
1387 return;
1388 }
1389
1390 status[0] |= se_cmd->scsi_status & 0x3f;/* status */
1391 status[1] =
1392 (sense[0] & 0x80) | /* valid */
1393 ((sense[2] & 0xe0) >> 1) | /* mark, eom, ili */
1394 (sense[2] & 0x0f); /* sense_key */
1395 status[2] = se_cmd->scsi_asc; /* sense_code */
1396 status[3] = se_cmd->scsi_ascq; /* sense_qualifier */
1397
1398 /* information */
1399 status[4] = sense[3];
1400 status[5] = sense[4];
1401 status[6] = sense[5];
1402 status[7] = sense[6];
1403
1404 /* CDB-dependent */
1405 status[8] = sense[8];
1406 status[9] = sense[9];
1407 status[10] = sense[10];
1408 status[11] = sense[11];
1409
1410 /* fru */
1411 status[12] = sense[14];
1412
1413 /* sense_key-dependent */
1414 status[13] = sense[15];
1415 status[14] = sense[16];
1416 status[15] = sense[17];
1417
1418 req->status.status |= cpu_to_be32(
1419 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1420 STATUS_BLOCK_DEAD(0) |
1421 STATUS_BLOCK_LEN(5) |
1422 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1423 }
1424
1425 static int sbp_send_sense(struct sbp_target_request *req)
1426 {
1427 struct se_cmd *se_cmd = &req->se_cmd;
1428
1429 if (se_cmd->scsi_sense_length) {
1430 sbp_sense_mangle(req);
1431 } else {
1432 req->status.status |= cpu_to_be32(
1433 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1434 STATUS_BLOCK_DEAD(0) |
1435 STATUS_BLOCK_LEN(1) |
1436 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_OK));
1437 }
1438
1439 return sbp_send_status(req);
1440 }
1441
1442 static void sbp_free_request(struct sbp_target_request *req)
1443 {
1444 struct se_cmd *se_cmd = &req->se_cmd;
1445 struct se_session *se_sess = se_cmd->se_sess;
1446
1447 kfree(req->pg_tbl);
1448 kfree(req->cmd_buf);
1449
1450 target_free_tag(se_sess, se_cmd);
1451 }
1452
1453 static void sbp_mgt_agent_process(struct work_struct *work)
1454 {
1455 struct sbp_management_agent *agent =
1456 container_of(work, struct sbp_management_agent, work);
1457 struct sbp_management_request *req = agent->request;
1458 int ret;
1459 int status_data_len = 0;
1460
1461 /* fetch the ORB from the initiator */
1462 ret = sbp_run_transaction(req->card, TCODE_READ_BLOCK_REQUEST,
1463 req->node_addr, req->generation, req->speed,
1464 agent->orb_offset, &req->orb, sizeof(req->orb));
1465 if (ret != RCODE_COMPLETE) {
1466 pr_debug("mgt_orb fetch failed: %x\n", ret);
1467 goto out;
1468 }
1469
1470 pr_debug("mgt_orb ptr1:0x%llx ptr2:0x%llx misc:0x%x len:0x%x status_fifo:0x%llx\n",
1471 sbp2_pointer_to_addr(&req->orb.ptr1),
1472 sbp2_pointer_to_addr(&req->orb.ptr2),
1473 be32_to_cpu(req->orb.misc), be32_to_cpu(req->orb.length),
1474 sbp2_pointer_to_addr(&req->orb.status_fifo));
1475
1476 if (!ORB_NOTIFY(be32_to_cpu(req->orb.misc)) ||
1477 ORB_REQUEST_FORMAT(be32_to_cpu(req->orb.misc)) != 0) {
1478 pr_err("mgt_orb bad request\n");
1479 goto out;
1480 }
1481
1482 switch (MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc))) {
1483 case MANAGEMENT_ORB_FUNCTION_LOGIN:
1484 sbp_management_request_login(agent, req, &status_data_len);
1485 break;
1486
1487 case MANAGEMENT_ORB_FUNCTION_QUERY_LOGINS:
1488 sbp_management_request_query_logins(agent, req,
1489 &status_data_len);
1490 break;
1491
1492 case MANAGEMENT_ORB_FUNCTION_RECONNECT:
1493 sbp_management_request_reconnect(agent, req, &status_data_len);
1494 break;
1495
1496 case MANAGEMENT_ORB_FUNCTION_SET_PASSWORD:
1497 pr_notice("SET PASSWORD not implemented\n");
1498
1499 req->status.status = cpu_to_be32(
1500 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1501 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1502
1503 break;
1504
1505 case MANAGEMENT_ORB_FUNCTION_LOGOUT:
1506 sbp_management_request_logout(agent, req, &status_data_len);
1507 break;
1508
1509 case MANAGEMENT_ORB_FUNCTION_ABORT_TASK:
1510 pr_notice("ABORT TASK not implemented\n");
1511
1512 req->status.status = cpu_to_be32(
1513 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1514 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1515
1516 break;
1517
1518 case MANAGEMENT_ORB_FUNCTION_ABORT_TASK_SET:
1519 pr_notice("ABORT TASK SET not implemented\n");
1520
1521 req->status.status = cpu_to_be32(
1522 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1523 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1524
1525 break;
1526
1527 case MANAGEMENT_ORB_FUNCTION_LOGICAL_UNIT_RESET:
1528 pr_notice("LOGICAL UNIT RESET not implemented\n");
1529
1530 req->status.status = cpu_to_be32(
1531 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1532 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1533
1534 break;
1535
1536 case MANAGEMENT_ORB_FUNCTION_TARGET_RESET:
1537 pr_notice("TARGET RESET not implemented\n");
1538
1539 req->status.status = cpu_to_be32(
1540 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1541 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1542
1543 break;
1544
1545 default:
1546 pr_notice("unknown management function 0x%x\n",
1547 MANAGEMENT_ORB_FUNCTION(be32_to_cpu(req->orb.misc)));
1548
1549 req->status.status = cpu_to_be32(
1550 STATUS_BLOCK_RESP(STATUS_RESP_REQUEST_COMPLETE) |
1551 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_REQ_TYPE_NOTSUPP));
1552
1553 break;
1554 }
1555
1556 req->status.status |= cpu_to_be32(
1557 STATUS_BLOCK_SRC(1) | /* Response to ORB, next_ORB absent */
1558 STATUS_BLOCK_LEN(DIV_ROUND_UP(status_data_len, 4) + 1) |
1559 STATUS_BLOCK_ORB_OFFSET_HIGH(agent->orb_offset >> 32));
1560 req->status.orb_low = cpu_to_be32(agent->orb_offset);
1561
1562 /* write the status block back to the initiator */
1563 ret = sbp_run_transaction(req->card, TCODE_WRITE_BLOCK_REQUEST,
1564 req->node_addr, req->generation, req->speed,
1565 sbp2_pointer_to_addr(&req->orb.status_fifo),
1566 &req->status, 8 + status_data_len);
1567 if (ret != RCODE_COMPLETE) {
1568 pr_debug("mgt_orb status write failed: %x\n", ret);
1569 goto out;
1570 }
1571
1572 out:
1573 fw_card_put(req->card);
1574 kfree(req);
1575
1576 spin_lock_bh(&agent->lock);
1577 agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1578 spin_unlock_bh(&agent->lock);
1579 }
1580
1581 static void sbp_mgt_agent_rw(struct fw_card *card,
1582 struct fw_request *request, int tcode, int destination, int source,
1583 int generation, unsigned long long offset, void *data, size_t length,
1584 void *callback_data)
1585 {
1586 struct sbp_management_agent *agent = callback_data;
1587 struct sbp2_pointer *ptr = data;
1588 int rcode = RCODE_ADDRESS_ERROR;
1589
1590 if (!agent->tport->enable)
1591 goto out;
1592
1593 if ((offset != agent->handler.offset) || (length != 8))
1594 goto out;
1595
1596 if (tcode == TCODE_WRITE_BLOCK_REQUEST) {
1597 struct sbp_management_request *req;
1598 int prev_state;
1599
1600 spin_lock_bh(&agent->lock);
1601 prev_state = agent->state;
1602 agent->state = MANAGEMENT_AGENT_STATE_BUSY;
1603 spin_unlock_bh(&agent->lock);
1604
1605 if (prev_state == MANAGEMENT_AGENT_STATE_BUSY) {
1606 pr_notice("ignoring management request while busy\n");
1607 rcode = RCODE_CONFLICT_ERROR;
1608 goto out;
1609 }
1610 req = kzalloc(sizeof(*req), GFP_ATOMIC);
1611 if (!req) {
1612 rcode = RCODE_CONFLICT_ERROR;
1613 goto out;
1614 }
1615
1616 req->card = fw_card_get(card);
1617 req->generation = generation;
1618 req->node_addr = source;
1619 req->speed = fw_get_request_speed(request);
1620
1621 agent->orb_offset = sbp2_pointer_to_addr(ptr);
1622 agent->request = req;
1623
1624 queue_work(system_unbound_wq, &agent->work);
1625 rcode = RCODE_COMPLETE;
1626 } else if (tcode == TCODE_READ_BLOCK_REQUEST) {
1627 addr_to_sbp2_pointer(agent->orb_offset, ptr);
1628 rcode = RCODE_COMPLETE;
1629 } else {
1630 rcode = RCODE_TYPE_ERROR;
1631 }
1632
1633 out:
1634 fw_send_response(card, request, rcode);
1635 }
1636
1637 static struct sbp_management_agent *sbp_management_agent_register(
1638 struct sbp_tport *tport)
1639 {
1640 int ret;
1641 struct sbp_management_agent *agent;
1642
1643 agent = kmalloc(sizeof(*agent), GFP_KERNEL);
1644 if (!agent)
1645 return ERR_PTR(-ENOMEM);
1646
1647 spin_lock_init(&agent->lock);
1648 agent->tport = tport;
1649 agent->handler.length = 0x08;
1650 agent->handler.address_callback = sbp_mgt_agent_rw;
1651 agent->handler.callback_data = agent;
1652 agent->state = MANAGEMENT_AGENT_STATE_IDLE;
1653 INIT_WORK(&agent->work, sbp_mgt_agent_process);
1654 agent->orb_offset = 0;
1655 agent->request = NULL;
1656
1657 ret = fw_core_add_address_handler(&agent->handler,
1658 &sbp_register_region);
1659 if (ret < 0) {
1660 kfree(agent);
1661 return ERR_PTR(ret);
1662 }
1663
1664 return agent;
1665 }
1666
1667 static void sbp_management_agent_unregister(struct sbp_management_agent *agent)
1668 {
1669 fw_core_remove_address_handler(&agent->handler);
1670 cancel_work_sync(&agent->work);
1671 kfree(agent);
1672 }
1673
1674 static int sbp_check_true(struct se_portal_group *se_tpg)
1675 {
1676 return 1;
1677 }
1678
1679 static int sbp_check_false(struct se_portal_group *se_tpg)
1680 {
1681 return 0;
1682 }
1683
1684 static char *sbp_get_fabric_wwn(struct se_portal_group *se_tpg)
1685 {
1686 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1687 struct sbp_tport *tport = tpg->tport;
1688
1689 return &tport->tport_name[0];
1690 }
1691
1692 static u16 sbp_get_tag(struct se_portal_group *se_tpg)
1693 {
1694 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1695 return tpg->tport_tpgt;
1696 }
1697
1698 static u32 sbp_tpg_get_inst_index(struct se_portal_group *se_tpg)
1699 {
1700 return 1;
1701 }
1702
1703 static void sbp_release_cmd(struct se_cmd *se_cmd)
1704 {
1705 struct sbp_target_request *req = container_of(se_cmd,
1706 struct sbp_target_request, se_cmd);
1707
1708 sbp_free_request(req);
1709 }
1710
1711 static u32 sbp_sess_get_index(struct se_session *se_sess)
1712 {
1713 return 0;
1714 }
1715
1716 static int sbp_write_pending(struct se_cmd *se_cmd)
1717 {
1718 struct sbp_target_request *req = container_of(se_cmd,
1719 struct sbp_target_request, se_cmd);
1720 int ret;
1721
1722 ret = sbp_rw_data(req);
1723 if (ret) {
1724 req->status.status |= cpu_to_be32(
1725 STATUS_BLOCK_RESP(
1726 STATUS_RESP_TRANSPORT_FAILURE) |
1727 STATUS_BLOCK_DEAD(0) |
1728 STATUS_BLOCK_LEN(1) |
1729 STATUS_BLOCK_SBP_STATUS(
1730 SBP_STATUS_UNSPECIFIED_ERROR));
1731 sbp_send_status(req);
1732 return ret;
1733 }
1734
1735 target_execute_cmd(se_cmd);
1736 return 0;
1737 }
1738
1739 static void sbp_set_default_node_attrs(struct se_node_acl *nacl)
1740 {
1741 return;
1742 }
1743
1744 static int sbp_get_cmd_state(struct se_cmd *se_cmd)
1745 {
1746 return 0;
1747 }
1748
1749 static int sbp_queue_data_in(struct se_cmd *se_cmd)
1750 {
1751 struct sbp_target_request *req = container_of(se_cmd,
1752 struct sbp_target_request, se_cmd);
1753 int ret;
1754
1755 ret = sbp_rw_data(req);
1756 if (ret) {
1757 req->status.status |= cpu_to_be32(
1758 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1759 STATUS_BLOCK_DEAD(0) |
1760 STATUS_BLOCK_LEN(1) |
1761 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1762 sbp_send_status(req);
1763 return ret;
1764 }
1765
1766 return sbp_send_sense(req);
1767 }
1768
1769 /*
1770 * Called after command (no data transfer) or after the write (to device)
1771 * operation is completed
1772 */
1773 static int sbp_queue_status(struct se_cmd *se_cmd)
1774 {
1775 struct sbp_target_request *req = container_of(se_cmd,
1776 struct sbp_target_request, se_cmd);
1777
1778 return sbp_send_sense(req);
1779 }
1780
1781 static void sbp_queue_tm_rsp(struct se_cmd *se_cmd)
1782 {
1783 }
1784
1785 static void sbp_aborted_task(struct se_cmd *se_cmd)
1786 {
1787 return;
1788 }
1789
1790 static int sbp_check_stop_free(struct se_cmd *se_cmd)
1791 {
1792 struct sbp_target_request *req = container_of(se_cmd,
1793 struct sbp_target_request, se_cmd);
1794
1795 return transport_generic_free_cmd(&req->se_cmd, 0);
1796 }
1797
1798 static int sbp_count_se_tpg_luns(struct se_portal_group *tpg)
1799 {
1800 struct se_lun *lun;
1801 int count = 0;
1802
1803 rcu_read_lock();
1804 hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link)
1805 count++;
1806 rcu_read_unlock();
1807
1808 return count;
1809 }
1810
1811 static int sbp_update_unit_directory(struct sbp_tport *tport)
1812 {
1813 struct se_lun *lun;
1814 int num_luns, num_entries, idx = 0, mgt_agt_addr, ret;
1815 u32 *data;
1816
1817 if (tport->unit_directory.data) {
1818 fw_core_remove_descriptor(&tport->unit_directory);
1819 kfree(tport->unit_directory.data);
1820 tport->unit_directory.data = NULL;
1821 }
1822
1823 if (!tport->enable || !tport->tpg)
1824 return 0;
1825
1826 num_luns = sbp_count_se_tpg_luns(&tport->tpg->se_tpg);
1827
1828 /*
1829 * Number of entries in the final unit directory:
1830 * - all of those in the template
1831 * - management_agent
1832 * - unit_characteristics
1833 * - reconnect_timeout
1834 * - unit unique ID
1835 * - one for each LUN
1836 *
1837 * MUST NOT include leaf or sub-directory entries
1838 */
1839 num_entries = ARRAY_SIZE(sbp_unit_directory_template) + 4 + num_luns;
1840
1841 if (tport->directory_id != -1)
1842 num_entries++;
1843
1844 /* allocate num_entries + 4 for the header and unique ID leaf */
1845 data = kcalloc((num_entries + 4), sizeof(u32), GFP_KERNEL);
1846 if (!data)
1847 return -ENOMEM;
1848
1849 /* directory_length */
1850 data[idx++] = num_entries << 16;
1851
1852 /* directory_id */
1853 if (tport->directory_id != -1)
1854 data[idx++] = (CSR_DIRECTORY_ID << 24) | tport->directory_id;
1855
1856 /* unit directory template */
1857 memcpy(&data[idx], sbp_unit_directory_template,
1858 sizeof(sbp_unit_directory_template));
1859 idx += ARRAY_SIZE(sbp_unit_directory_template);
1860
1861 /* management_agent */
1862 mgt_agt_addr = (tport->mgt_agt->handler.offset - CSR_REGISTER_BASE) / 4;
1863 data[idx++] = 0x54000000 | (mgt_agt_addr & 0x00ffffff);
1864
1865 /* unit_characteristics */
1866 data[idx++] = 0x3a000000 |
1867 (((tport->mgt_orb_timeout * 2) << 8) & 0xff00) |
1868 SBP_ORB_FETCH_SIZE;
1869
1870 /* reconnect_timeout */
1871 data[idx++] = 0x3d000000 | (tport->max_reconnect_timeout & 0xffff);
1872
1873 /* unit unique ID (leaf is just after LUNs) */
1874 data[idx++] = 0x8d000000 | (num_luns + 1);
1875
1876 rcu_read_lock();
1877 hlist_for_each_entry_rcu(lun, &tport->tpg->se_tpg.tpg_lun_hlist, link) {
1878 struct se_device *dev;
1879 int type;
1880 /*
1881 * rcu_dereference_raw protected by se_lun->lun_group symlink
1882 * reference to se_device->dev_group.
1883 */
1884 dev = rcu_dereference_raw(lun->lun_se_dev);
1885 type = dev->transport->get_device_type(dev);
1886
1887 /* logical_unit_number */
1888 data[idx++] = 0x14000000 |
1889 ((type << 16) & 0x1f0000) |
1890 (lun->unpacked_lun & 0xffff);
1891 }
1892 rcu_read_unlock();
1893
1894 /* unit unique ID leaf */
1895 data[idx++] = 2 << 16;
1896 data[idx++] = tport->guid >> 32;
1897 data[idx++] = tport->guid;
1898
1899 tport->unit_directory.length = idx;
1900 tport->unit_directory.key = (CSR_DIRECTORY | CSR_UNIT) << 24;
1901 tport->unit_directory.data = data;
1902
1903 ret = fw_core_add_descriptor(&tport->unit_directory);
1904 if (ret < 0) {
1905 kfree(tport->unit_directory.data);
1906 tport->unit_directory.data = NULL;
1907 }
1908
1909 return ret;
1910 }
1911
1912 static ssize_t sbp_parse_wwn(const char *name, u64 *wwn)
1913 {
1914 const char *cp;
1915 char c, nibble;
1916 int pos = 0, err;
1917
1918 *wwn = 0;
1919 for (cp = name; cp < &name[SBP_NAMELEN - 1]; cp++) {
1920 c = *cp;
1921 if (c == '\n' && cp[1] == '\0')
1922 continue;
1923 if (c == '\0') {
1924 err = 2;
1925 if (pos != 16)
1926 goto fail;
1927 return cp - name;
1928 }
1929 err = 3;
1930 if (isdigit(c))
1931 nibble = c - '0';
1932 else if (isxdigit(c))
1933 nibble = tolower(c) - 'a' + 10;
1934 else
1935 goto fail;
1936 *wwn = (*wwn << 4) | nibble;
1937 pos++;
1938 }
1939 err = 4;
1940 fail:
1941 printk(KERN_INFO "err %u len %zu pos %u\n",
1942 err, cp - name, pos);
1943 return -1;
1944 }
1945
1946 static ssize_t sbp_format_wwn(char *buf, size_t len, u64 wwn)
1947 {
1948 return snprintf(buf, len, "%016llx", wwn);
1949 }
1950
1951 static int sbp_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
1952 {
1953 u64 guid = 0;
1954
1955 if (sbp_parse_wwn(name, &guid) < 0)
1956 return -EINVAL;
1957 return 0;
1958 }
1959
1960 static int sbp_post_link_lun(
1961 struct se_portal_group *se_tpg,
1962 struct se_lun *se_lun)
1963 {
1964 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1965
1966 return sbp_update_unit_directory(tpg->tport);
1967 }
1968
1969 static void sbp_pre_unlink_lun(
1970 struct se_portal_group *se_tpg,
1971 struct se_lun *se_lun)
1972 {
1973 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
1974 struct sbp_tport *tport = tpg->tport;
1975 int ret;
1976
1977 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0)
1978 tport->enable = 0;
1979
1980 ret = sbp_update_unit_directory(tport);
1981 if (ret < 0)
1982 pr_err("unlink LUN: failed to update unit directory\n");
1983 }
1984
1985 static struct se_portal_group *sbp_make_tpg(struct se_wwn *wwn,
1986 const char *name)
1987 {
1988 struct sbp_tport *tport =
1989 container_of(wwn, struct sbp_tport, tport_wwn);
1990
1991 struct sbp_tpg *tpg;
1992 unsigned long tpgt;
1993 int ret;
1994
1995 if (strstr(name, "tpgt_") != name)
1996 return ERR_PTR(-EINVAL);
1997 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
1998 return ERR_PTR(-EINVAL);
1999
2000 if (tport->tpg) {
2001 pr_err("Only one TPG per Unit is possible.\n");
2002 return ERR_PTR(-EBUSY);
2003 }
2004
2005 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2006 if (!tpg)
2007 return ERR_PTR(-ENOMEM);
2008
2009 tpg->tport = tport;
2010 tpg->tport_tpgt = tpgt;
2011 tport->tpg = tpg;
2012
2013 /* default attribute values */
2014 tport->enable = 0;
2015 tport->directory_id = -1;
2016 tport->mgt_orb_timeout = 15;
2017 tport->max_reconnect_timeout = 5;
2018 tport->max_logins_per_lun = 1;
2019
2020 tport->mgt_agt = sbp_management_agent_register(tport);
2021 if (IS_ERR(tport->mgt_agt)) {
2022 ret = PTR_ERR(tport->mgt_agt);
2023 goto out_free_tpg;
2024 }
2025
2026 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_SBP);
2027 if (ret < 0)
2028 goto out_unreg_mgt_agt;
2029
2030 return &tpg->se_tpg;
2031
2032 out_unreg_mgt_agt:
2033 sbp_management_agent_unregister(tport->mgt_agt);
2034 out_free_tpg:
2035 tport->tpg = NULL;
2036 kfree(tpg);
2037 return ERR_PTR(ret);
2038 }
2039
2040 static void sbp_drop_tpg(struct se_portal_group *se_tpg)
2041 {
2042 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2043 struct sbp_tport *tport = tpg->tport;
2044
2045 core_tpg_deregister(se_tpg);
2046 sbp_management_agent_unregister(tport->mgt_agt);
2047 tport->tpg = NULL;
2048 kfree(tpg);
2049 }
2050
2051 static struct se_wwn *sbp_make_tport(
2052 struct target_fabric_configfs *tf,
2053 struct config_group *group,
2054 const char *name)
2055 {
2056 struct sbp_tport *tport;
2057 u64 guid = 0;
2058
2059 if (sbp_parse_wwn(name, &guid) < 0)
2060 return ERR_PTR(-EINVAL);
2061
2062 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2063 if (!tport)
2064 return ERR_PTR(-ENOMEM);
2065
2066 tport->guid = guid;
2067 sbp_format_wwn(tport->tport_name, SBP_NAMELEN, guid);
2068
2069 return &tport->tport_wwn;
2070 }
2071
2072 static void sbp_drop_tport(struct se_wwn *wwn)
2073 {
2074 struct sbp_tport *tport =
2075 container_of(wwn, struct sbp_tport, tport_wwn);
2076
2077 kfree(tport);
2078 }
2079
2080 static ssize_t sbp_wwn_version_show(struct config_item *item, char *page)
2081 {
2082 return sprintf(page, "FireWire SBP fabric module %s\n", SBP_VERSION);
2083 }
2084
2085 CONFIGFS_ATTR_RO(sbp_wwn_, version);
2086
2087 static struct configfs_attribute *sbp_wwn_attrs[] = {
2088 &sbp_wwn_attr_version,
2089 NULL,
2090 };
2091
2092 static ssize_t sbp_tpg_directory_id_show(struct config_item *item, char *page)
2093 {
2094 struct se_portal_group *se_tpg = to_tpg(item);
2095 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2096 struct sbp_tport *tport = tpg->tport;
2097
2098 if (tport->directory_id == -1)
2099 return sprintf(page, "implicit\n");
2100 else
2101 return sprintf(page, "%06x\n", tport->directory_id);
2102 }
2103
2104 static ssize_t sbp_tpg_directory_id_store(struct config_item *item,
2105 const char *page, size_t count)
2106 {
2107 struct se_portal_group *se_tpg = to_tpg(item);
2108 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2109 struct sbp_tport *tport = tpg->tport;
2110 unsigned long val;
2111
2112 if (tport->enable) {
2113 pr_err("Cannot change the directory_id on an active target.\n");
2114 return -EBUSY;
2115 }
2116
2117 if (strstr(page, "implicit") == page) {
2118 tport->directory_id = -1;
2119 } else {
2120 if (kstrtoul(page, 16, &val) < 0)
2121 return -EINVAL;
2122 if (val > 0xffffff)
2123 return -EINVAL;
2124
2125 tport->directory_id = val;
2126 }
2127
2128 return count;
2129 }
2130
2131 static ssize_t sbp_tpg_enable_show(struct config_item *item, char *page)
2132 {
2133 struct se_portal_group *se_tpg = to_tpg(item);
2134 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2135 struct sbp_tport *tport = tpg->tport;
2136 return sprintf(page, "%d\n", tport->enable);
2137 }
2138
2139 static ssize_t sbp_tpg_enable_store(struct config_item *item,
2140 const char *page, size_t count)
2141 {
2142 struct se_portal_group *se_tpg = to_tpg(item);
2143 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2144 struct sbp_tport *tport = tpg->tport;
2145 unsigned long val;
2146 int ret;
2147
2148 if (kstrtoul(page, 0, &val) < 0)
2149 return -EINVAL;
2150 if ((val != 0) && (val != 1))
2151 return -EINVAL;
2152
2153 if (tport->enable == val)
2154 return count;
2155
2156 if (val) {
2157 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) {
2158 pr_err("Cannot enable a target with no LUNs!\n");
2159 return -EINVAL;
2160 }
2161 } else {
2162 /* XXX: force-shutdown sessions instead? */
2163 spin_lock_bh(&se_tpg->session_lock);
2164 if (!list_empty(&se_tpg->tpg_sess_list)) {
2165 spin_unlock_bh(&se_tpg->session_lock);
2166 return -EBUSY;
2167 }
2168 spin_unlock_bh(&se_tpg->session_lock);
2169 }
2170
2171 tport->enable = val;
2172
2173 ret = sbp_update_unit_directory(tport);
2174 if (ret < 0) {
2175 pr_err("Could not update Config ROM\n");
2176 return ret;
2177 }
2178
2179 return count;
2180 }
2181
2182 CONFIGFS_ATTR(sbp_tpg_, directory_id);
2183 CONFIGFS_ATTR(sbp_tpg_, enable);
2184
2185 static struct configfs_attribute *sbp_tpg_base_attrs[] = {
2186 &sbp_tpg_attr_directory_id,
2187 &sbp_tpg_attr_enable,
2188 NULL,
2189 };
2190
2191 static ssize_t sbp_tpg_attrib_mgt_orb_timeout_show(struct config_item *item,
2192 char *page)
2193 {
2194 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2195 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2196 struct sbp_tport *tport = tpg->tport;
2197 return sprintf(page, "%d\n", tport->mgt_orb_timeout);
2198 }
2199
2200 static ssize_t sbp_tpg_attrib_mgt_orb_timeout_store(struct config_item *item,
2201 const char *page, size_t count)
2202 {
2203 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2204 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2205 struct sbp_tport *tport = tpg->tport;
2206 unsigned long val;
2207 int ret;
2208
2209 if (kstrtoul(page, 0, &val) < 0)
2210 return -EINVAL;
2211 if ((val < 1) || (val > 127))
2212 return -EINVAL;
2213
2214 if (tport->mgt_orb_timeout == val)
2215 return count;
2216
2217 tport->mgt_orb_timeout = val;
2218
2219 ret = sbp_update_unit_directory(tport);
2220 if (ret < 0)
2221 return ret;
2222
2223 return count;
2224 }
2225
2226 static ssize_t sbp_tpg_attrib_max_reconnect_timeout_show(struct config_item *item,
2227 char *page)
2228 {
2229 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2230 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2231 struct sbp_tport *tport = tpg->tport;
2232 return sprintf(page, "%d\n", tport->max_reconnect_timeout);
2233 }
2234
2235 static ssize_t sbp_tpg_attrib_max_reconnect_timeout_store(struct config_item *item,
2236 const char *page, size_t count)
2237 {
2238 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2239 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2240 struct sbp_tport *tport = tpg->tport;
2241 unsigned long val;
2242 int ret;
2243
2244 if (kstrtoul(page, 0, &val) < 0)
2245 return -EINVAL;
2246 if ((val < 1) || (val > 32767))
2247 return -EINVAL;
2248
2249 if (tport->max_reconnect_timeout == val)
2250 return count;
2251
2252 tport->max_reconnect_timeout = val;
2253
2254 ret = sbp_update_unit_directory(tport);
2255 if (ret < 0)
2256 return ret;
2257
2258 return count;
2259 }
2260
2261 static ssize_t sbp_tpg_attrib_max_logins_per_lun_show(struct config_item *item,
2262 char *page)
2263 {
2264 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2265 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2266 struct sbp_tport *tport = tpg->tport;
2267 return sprintf(page, "%d\n", tport->max_logins_per_lun);
2268 }
2269
2270 static ssize_t sbp_tpg_attrib_max_logins_per_lun_store(struct config_item *item,
2271 const char *page, size_t count)
2272 {
2273 struct se_portal_group *se_tpg = attrib_to_tpg(item);
2274 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2275 struct sbp_tport *tport = tpg->tport;
2276 unsigned long val;
2277
2278 if (kstrtoul(page, 0, &val) < 0)
2279 return -EINVAL;
2280 if ((val < 1) || (val > 127))
2281 return -EINVAL;
2282
2283 /* XXX: also check against current count? */
2284
2285 tport->max_logins_per_lun = val;
2286
2287 return count;
2288 }
2289
2290 CONFIGFS_ATTR(sbp_tpg_attrib_, mgt_orb_timeout);
2291 CONFIGFS_ATTR(sbp_tpg_attrib_, max_reconnect_timeout);
2292 CONFIGFS_ATTR(sbp_tpg_attrib_, max_logins_per_lun);
2293
2294 static struct configfs_attribute *sbp_tpg_attrib_attrs[] = {
2295 &sbp_tpg_attrib_attr_mgt_orb_timeout,
2296 &sbp_tpg_attrib_attr_max_reconnect_timeout,
2297 &sbp_tpg_attrib_attr_max_logins_per_lun,
2298 NULL,
2299 };
2300
2301 static const struct target_core_fabric_ops sbp_ops = {
2302 .module = THIS_MODULE,
2303 .fabric_name = "sbp",
2304 .tpg_get_wwn = sbp_get_fabric_wwn,
2305 .tpg_get_tag = sbp_get_tag,
2306 .tpg_check_demo_mode = sbp_check_true,
2307 .tpg_check_demo_mode_cache = sbp_check_true,
2308 .tpg_check_demo_mode_write_protect = sbp_check_false,
2309 .tpg_check_prod_mode_write_protect = sbp_check_false,
2310 .tpg_get_inst_index = sbp_tpg_get_inst_index,
2311 .release_cmd = sbp_release_cmd,
2312 .sess_get_index = sbp_sess_get_index,
2313 .write_pending = sbp_write_pending,
2314 .set_default_node_attributes = sbp_set_default_node_attrs,
2315 .get_cmd_state = sbp_get_cmd_state,
2316 .queue_data_in = sbp_queue_data_in,
2317 .queue_status = sbp_queue_status,
2318 .queue_tm_rsp = sbp_queue_tm_rsp,
2319 .aborted_task = sbp_aborted_task,
2320 .check_stop_free = sbp_check_stop_free,
2321
2322 .fabric_make_wwn = sbp_make_tport,
2323 .fabric_drop_wwn = sbp_drop_tport,
2324 .fabric_make_tpg = sbp_make_tpg,
2325 .fabric_drop_tpg = sbp_drop_tpg,
2326 .fabric_post_link = sbp_post_link_lun,
2327 .fabric_pre_unlink = sbp_pre_unlink_lun,
2328 .fabric_make_np = NULL,
2329 .fabric_drop_np = NULL,
2330 .fabric_init_nodeacl = sbp_init_nodeacl,
2331
2332 .tfc_wwn_attrs = sbp_wwn_attrs,
2333 .tfc_tpg_base_attrs = sbp_tpg_base_attrs,
2334 .tfc_tpg_attrib_attrs = sbp_tpg_attrib_attrs,
2335 };
2336
2337 static int __init sbp_init(void)
2338 {
2339 return target_register_template(&sbp_ops);
2340 };
2341
2342 static void __exit sbp_exit(void)
2343 {
2344 target_unregister_template(&sbp_ops);
2345 };
2346
2347 MODULE_DESCRIPTION("FireWire SBP fabric driver");
2348 MODULE_LICENSE("GPL");
2349 module_init(sbp_init);
2350 module_exit(sbp_exit);
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