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