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target: move node ACL allocation to core code
[linux-2.6-block.git] / drivers / target / sbp / sbp_target.c
CommitLineData
a511ce33
CB		 1/*
2 * SBP2 target driver (SCSI over IEEE1394 in target mode)
3 *
4 * Copyright (C) 2011 Chris Boot <bootc@bootc.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
20
21#define KMSG_COMPONENT "sbp_target"
22#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/string.h>
29#include <linux/configfs.h>
30#include <linux/ctype.h>
31#include <linux/firewire.h>
32#include <linux/firewire-constants.h>
33#include <scsi/scsi.h>
34#include <scsi/scsi_tcq.h>
35#include <target/target_core_base.h>
36#include <target/target_core_backend.h>
37#include <target/target_core_fabric.h>
38#include <target/target_core_fabric_configfs.h>
39#include <target/target_core_configfs.h>
40#include <target/configfs_macros.h>
41#include <asm/unaligned.h>
42
43#include "sbp_target.h"
44
9ac8928e 45static const struct target_core_fabric_ops sbp_ops;
a511ce33
CB		 46
47/* FireWire address region for management and command block address handlers */
48static const struct fw_address_region sbp_register_region = {
49 .start = CSR_REGISTER_BASE + 0x10000,
50 .end = 0x1000000000000ULL,
51};
52
53static 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
64static atomic_t login_id = ATOMIC_INIT(0);
65
66static void session_maintenance_work(struct work_struct *);
67static int sbp_run_transaction(struct fw_card *, int, int, int, int,
68 unsigned long long, void *, size_t);
69
70static 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
94static 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
111static 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
126static 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
155static 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
178static 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
197static 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
e70beee7 212 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
a511ce33
CB		 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
246static 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
267static void sbp_target_agent_unregister(struct sbp_target_agent *);
268
269static 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
289static struct sbp_target_agent *sbp_target_agent_register(
290 struct sbp_login_descriptor *);
291
292static 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
466already_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
512static 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
524static 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
583static 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;
5f2a3d61 589 int id;
a511ce33
CB		 590 struct sbp_login_descriptor *login;
591
5f2a3d61 592 id = LOGOUT_ORB_LOGIN_ID(be32_to_cpu(req->orb.misc));
a511ce33 593
5f2a3d61 594 login = sbp_login_find_by_id(tpg, id);
a511ce33 595 if (!login) {
5f2a3d61 596 pr_warn("cannot find login: %d\n", id);
a511ce33
CB		 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
623static 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
652static 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;
bf11eefc 662 list_move_tail(&login->link, &login_list);
a511ce33
CB		 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
674static 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
703static int tgt_agent_rw_agent_state(struct fw_card *card, int tcode, void *data,
704 struct sbp_target_agent *agent)
705{
37419d67 706 int state;
a511ce33
CB		 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);
37419d67 713 state = agent->state;
a511ce33 714 spin_unlock_bh(&agent->lock);
37419d67
CB		 715
716 *(__be32 *)data = cpu_to_be32(state);
a511ce33
CB		 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
729static 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
745static 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
784static 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
814static 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
831static 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
881out:
882 fw_send_response(card, request, rcode);
883}
884
885static void sbp_handle_command(struct sbp_target_request *);
886static int sbp_send_status(struct sbp_target_request *);
887static void sbp_free_request(struct sbp_target_request *);
888
889static 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 */
936static 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
947static 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
1030static 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
1062static 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 */
1073static 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 */
1103static 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
1127static 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
1156static 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
1183static 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
1210static 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);
7c78b8de 1221 goto err;
a511ce33
CB		 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);
7c78b8de 1228 goto err;
a511ce33
CB		 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
d6dfc868
RD		 1237 if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf,
1238 req->sense_buf, unpacked_lun, data_length,
68d81f40 1239 TCM_SIMPLE_TAG, data_dir, 0))
d6dfc868
RD		 1240 goto err;
1241
7c78b8de
RD		 1242 return;
1243
1244err:
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);
a511ce33
CB		 1252}
1253
1254/*
1255 * DMA_TO_DEVICE = read from initiator (SCSI WRITE)
1256 * DMA_FROM_DEVICE = write to initiator (SCSI READ)
1257 */
1258static 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
1348static 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
1368static 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
1435static 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
1452static 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
1459static 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
1578out:
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
1587static 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
1640out:
1641 fw_send_response(card, request, rcode);
1642}
1643
1644static 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
1674static 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
1681static int sbp_check_true(struct se_portal_group *se_tpg)
1682{
1683 return 1;
1684}
1685
1686static int sbp_check_false(struct se_portal_group *se_tpg)
1687{
1688 return 0;
1689}
1690
1691static char *sbp_get_fabric_name(void)
1692{
1693 return "sbp";
1694}
1695
1696static 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
1704static 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
a511ce33
CB		 1710static u32 sbp_tpg_get_inst_index(struct se_portal_group *se_tpg)
1711{
1712 return 1;
1713}
1714
1715static void sbp_release_cmd(struct se_cmd *se_cmd)
1716{
1717 struct sbp_target_request *req = container_of(se_cmd,
1718 struct sbp_target_request, se_cmd);
1719
1720 sbp_free_request(req);
1721}
1722
1723static int sbp_shutdown_session(struct se_session *se_sess)
1724{
1725 return 0;
1726}
1727
1728static void sbp_close_session(struct se_session *se_sess)
1729{
1730 return;
1731}
1732
1733static u32 sbp_sess_get_index(struct se_session *se_sess)
1734{
1735 return 0;
1736}
1737
1738static int sbp_write_pending(struct se_cmd *se_cmd)
1739{
1740 struct sbp_target_request *req = container_of(se_cmd,
1741 struct sbp_target_request, se_cmd);
1742 int ret;
1743
1744 ret = sbp_rw_data(req);
1745 if (ret) {
1746 req->status.status |= cpu_to_be32(
1747 STATUS_BLOCK_RESP(
1748 STATUS_RESP_TRANSPORT_FAILURE) |
1749 STATUS_BLOCK_DEAD(0) |
1750 STATUS_BLOCK_LEN(1) |
1751 STATUS_BLOCK_SBP_STATUS(
1752 SBP_STATUS_UNSPECIFIED_ERROR));
1753 sbp_send_status(req);
1754 return ret;
1755 }
1756
70baf0ab 1757 target_execute_cmd(se_cmd);
a511ce33
CB		 1758 return 0;
1759}
1760
1761static int sbp_write_pending_status(struct se_cmd *se_cmd)
1762{
1763 return 0;
1764}
1765
1766static void sbp_set_default_node_attrs(struct se_node_acl *nacl)
1767{
1768 return;
1769}
1770
1771static u32 sbp_get_task_tag(struct se_cmd *se_cmd)
1772{
1773 struct sbp_target_request *req = container_of(se_cmd,
1774 struct sbp_target_request, se_cmd);
1775
1776 /* only used for printk until we do TMRs */
1777 return (u32)req->orb_pointer;
1778}
1779
1780static int sbp_get_cmd_state(struct se_cmd *se_cmd)
1781{
1782 return 0;
1783}
1784
1785static int sbp_queue_data_in(struct se_cmd *se_cmd)
1786{
1787 struct sbp_target_request *req = container_of(se_cmd,
1788 struct sbp_target_request, se_cmd);
1789 int ret;
1790
1791 ret = sbp_rw_data(req);
1792 if (ret) {
1793 req->status.status |= cpu_to_be32(
1794 STATUS_BLOCK_RESP(STATUS_RESP_TRANSPORT_FAILURE) |
1795 STATUS_BLOCK_DEAD(0) |
1796 STATUS_BLOCK_LEN(1) |
1797 STATUS_BLOCK_SBP_STATUS(SBP_STATUS_UNSPECIFIED_ERROR));
1798 sbp_send_status(req);
1799 return ret;
1800 }
1801
1802 return sbp_send_sense(req);
1803}
1804
1805/*
1806 * Called after command (no data transfer) or after the write (to device)
1807 * operation is completed
1808 */
1809static int sbp_queue_status(struct se_cmd *se_cmd)
1810{
1811 struct sbp_target_request *req = container_of(se_cmd,
1812 struct sbp_target_request, se_cmd);
1813
1814 return sbp_send_sense(req);
1815}
1816
b79fafac 1817static void sbp_queue_tm_rsp(struct se_cmd *se_cmd)
a511ce33 1818{
a511ce33
CB		 1819}
1820
131e6abc
NB		 1821static void sbp_aborted_task(struct se_cmd *se_cmd)
1822{
1823 return;
1824}
1825
a511ce33
CB		 1826static int sbp_check_stop_free(struct se_cmd *se_cmd)
1827{
1828 struct sbp_target_request *req = container_of(se_cmd,
1829 struct sbp_target_request, se_cmd);
1830
1831 transport_generic_free_cmd(&req->se_cmd, 0);
1832 return 1;
1833}
1834
1835/*
1836 * Handlers for Serial Bus Protocol 2/3 (SBP-2 / SBP-3)
1837 */
1838static u8 sbp_get_fabric_proto_ident(struct se_portal_group *se_tpg)
1839{
1840 /*
1841 * Return a IEEE 1394 SCSI Protocol identifier for loopback operations
1842 * This is defined in section 7.5.1 Table 362 in spc4r17
1843 */
1844 return SCSI_PROTOCOL_SBP;
1845}
1846
1847static u32 sbp_get_pr_transport_id(
1848 struct se_portal_group *se_tpg,
1849 struct se_node_acl *se_nacl,
1850 struct t10_pr_registration *pr_reg,
1851 int *format_code,
1852 unsigned char *buf)
1853{
1854 int ret;
1855
1856 /*
1857 * Set PROTOCOL IDENTIFIER to 3h for SBP
1858 */
1859 buf[0] = SCSI_PROTOCOL_SBP;
1860 /*
1861 * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1862 * over IEEE 1394
1863 */
1864 ret = hex2bin(&buf[8], se_nacl->initiatorname, 8);
1865 if (ret < 0)
1866 pr_debug("sbp transport_id: invalid hex string\n");
1867
1868 /*
1869 * The IEEE 1394 Transport ID is a hardcoded 24-byte length
1870 */
1871 return 24;
1872}
1873
1874static u32 sbp_get_pr_transport_id_len(
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{
1880 *format_code = 0;
1881 /*
1882 * From spc4r17, 7.5.4.4 TransportID for initiator ports using SCSI
1883 * over IEEE 1394
1884 *
1885 * The SBP Transport ID is a hardcoded 24-byte length
1886 */
1887 return 24;
1888}
1889
1890/*
1891 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
1892 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
1893 */
1894static char *sbp_parse_pr_out_transport_id(
1895 struct se_portal_group *se_tpg,
1896 const char *buf,
1897 u32 *out_tid_len,
1898 char **port_nexus_ptr)
1899{
1900 /*
1901 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.4 TransportID
1902 * for initiator ports using SCSI over SBP Serial SCSI Protocol
1903 *
1904 * The TransportID for a IEEE 1394 Initiator Port is of fixed size of
1905 * 24 bytes, and IEEE 1394 does not contain a I_T nexus identifier,
1906 * so we return the **port_nexus_ptr set to NULL.
1907 */
1908 *port_nexus_ptr = NULL;
1909 *out_tid_len = 24;
1910
1911 return (char *)&buf[8];
1912}
1913
1914static int sbp_count_se_tpg_luns(struct se_portal_group *tpg)
1915{
1916 int i, count = 0;
1917
1918 spin_lock(&tpg->tpg_lun_lock);
1919 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1920 struct se_lun *se_lun = tpg->tpg_lun_list[i];
1921
1922 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
1923 continue;
1924
1925 count++;
1926 }
1927 spin_unlock(&tpg->tpg_lun_lock);
1928
1929 return count;
1930}
1931
1932static int sbp_update_unit_directory(struct sbp_tport *tport)
1933{
1934 int num_luns, num_entries, idx = 0, mgt_agt_addr, ret, i;
1935 u32 *data;
1936
1937 if (tport->unit_directory.data) {
1938 fw_core_remove_descriptor(&tport->unit_directory);
1939 kfree(tport->unit_directory.data);
1940 tport->unit_directory.data = NULL;
1941 }
1942
1943 if (!tport->enable || !tport->tpg)
1944 return 0;
1945
1946 num_luns = sbp_count_se_tpg_luns(&tport->tpg->se_tpg);
1947
1948 /*
1949 * Number of entries in the final unit directory:
1950 * - all of those in the template
1951 * - management_agent
1952 * - unit_characteristics
1953 * - reconnect_timeout
1954 * - unit unique ID
1955 * - one for each LUN
1956 *
1957 * MUST NOT include leaf or sub-directory entries
1958 */
1959 num_entries = ARRAY_SIZE(sbp_unit_directory_template) + 4 + num_luns;
1960
1961 if (tport->directory_id != -1)
1962 num_entries++;
1963
1964 /* allocate num_entries + 4 for the header and unique ID leaf */
1965 data = kcalloc((num_entries + 4), sizeof(u32), GFP_KERNEL);
1966 if (!data)
1967 return -ENOMEM;
1968
1969 /* directory_length */
1970 data[idx++] = num_entries << 16;
1971
1972 /* directory_id */
1973 if (tport->directory_id != -1)
1974 data[idx++] = (CSR_DIRECTORY_ID << 24) | tport->directory_id;
1975
1976 /* unit directory template */
1977 memcpy(&data[idx], sbp_unit_directory_template,
1978 sizeof(sbp_unit_directory_template));
1979 idx += ARRAY_SIZE(sbp_unit_directory_template);
1980
1981 /* management_agent */
1982 mgt_agt_addr = (tport->mgt_agt->handler.offset - CSR_REGISTER_BASE) / 4;
1983 data[idx++] = 0x54000000 | (mgt_agt_addr & 0x00ffffff);
1984
1985 /* unit_characteristics */
1986 data[idx++] = 0x3a000000 |
1987 (((tport->mgt_orb_timeout * 2) << 8) & 0xff00) |
1988 SBP_ORB_FETCH_SIZE;
1989
1990 /* reconnect_timeout */
1991 data[idx++] = 0x3d000000 | (tport->max_reconnect_timeout & 0xffff);
1992
1993 /* unit unique ID (leaf is just after LUNs) */
1994 data[idx++] = 0x8d000000 | (num_luns + 1);
1995
1996 spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
1997 for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
1998 struct se_lun *se_lun = tport->tpg->se_tpg.tpg_lun_list[i];
1999 struct se_device *dev;
2000 int type;
2001
2002 if (se_lun->lun_status == TRANSPORT_LUN_STATUS_FREE)
2003 continue;
2004
2005 spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2006
2007 dev = se_lun->lun_se_dev;
2008 type = dev->transport->get_device_type(dev);
2009
2010 /* logical_unit_number */
2011 data[idx++] = 0x14000000 |
2012 ((type << 16) & 0x1f0000) |
2013 (se_lun->unpacked_lun & 0xffff);
2014
2015 spin_lock(&tport->tpg->se_tpg.tpg_lun_lock);
2016 }
2017 spin_unlock(&tport->tpg->se_tpg.tpg_lun_lock);
2018
2019 /* unit unique ID leaf */
2020 data[idx++] = 2 << 16;
2021 data[idx++] = tport->guid >> 32;
2022 data[idx++] = tport->guid;
2023
2024 tport->unit_directory.length = idx;
2025 tport->unit_directory.key = (CSR_DIRECTORY | CSR_UNIT) << 24;
2026 tport->unit_directory.data = data;
2027
2028 ret = fw_core_add_descriptor(&tport->unit_directory);
2029 if (ret < 0) {
2030 kfree(tport->unit_directory.data);
2031 tport->unit_directory.data = NULL;
2032 }
2033
2034 return ret;
2035}
2036
343d475d 2037static ssize_t sbp_parse_wwn(const char *name, u64 *wwn)
a511ce33
CB		 2038{
2039 const char *cp;
2040 char c, nibble;
2041 int pos = 0, err;
2042
2043 *wwn = 0;
2044 for (cp = name; cp < &name[SBP_NAMELEN - 1]; cp++) {
2045 c = *cp;
2046 if (c == '\n' && cp[1] == '\0')
2047 continue;
2048 if (c == '\0') {
2049 err = 2;
2050 if (pos != 16)
2051 goto fail;
2052 return cp - name;
2053 }
2054 err = 3;
2055 if (isdigit(c))
2056 nibble = c - '0';
343d475d 2057 else if (isxdigit(c))
a511ce33
CB		 2058 nibble = tolower(c) - 'a' + 10;
2059 else
2060 goto fail;
2061 *wwn = (*wwn << 4) | nibble;
2062 pos++;
2063 }
2064 err = 4;
2065fail:
2066 printk(KERN_INFO "err %u len %zu pos %u\n",
2067 err, cp - name, pos);
2068 return -1;
2069}
2070
2071static ssize_t sbp_format_wwn(char *buf, size_t len, u64 wwn)
2072{
2073 return snprintf(buf, len, "%016llx", wwn);
2074}
2075
c7d6a803 2076static int sbp_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
a511ce33 2077{
a511ce33 2078 u64 guid = 0;
a511ce33 2079
343d475d 2080 if (sbp_parse_wwn(name, &guid) < 0)
c7d6a803
CH		 2081 return -EINVAL;
2082 return 0;
a511ce33
CB		 2083}
2084
2085static int sbp_post_link_lun(
2086 struct se_portal_group *se_tpg,
2087 struct se_lun *se_lun)
2088{
2089 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2090
2091 return sbp_update_unit_directory(tpg->tport);
2092}
2093
2094static void sbp_pre_unlink_lun(
2095 struct se_portal_group *se_tpg,
2096 struct se_lun *se_lun)
2097{
2098 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2099 struct sbp_tport *tport = tpg->tport;
2100 int ret;
2101
2102 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0)
2103 tport->enable = 0;
2104
2105 ret = sbp_update_unit_directory(tport);
2106 if (ret < 0)
2107 pr_err("unlink LUN: failed to update unit directory\n");
2108}
2109
2110static struct se_portal_group *sbp_make_tpg(
2111 struct se_wwn *wwn,
2112 struct config_group *group,
2113 const char *name)
2114{
2115 struct sbp_tport *tport =
2116 container_of(wwn, struct sbp_tport, tport_wwn);
2117
2118 struct sbp_tpg *tpg;
2119 unsigned long tpgt;
2120 int ret;
2121
2122 if (strstr(name, "tpgt_") != name)
2123 return ERR_PTR(-EINVAL);
2124 if (kstrtoul(name + 5, 10, &tpgt) || tpgt > UINT_MAX)
2125 return ERR_PTR(-EINVAL);
2126
2127 if (tport->tpg) {
2128 pr_err("Only one TPG per Unit is possible.\n");
2129 return ERR_PTR(-EBUSY);
2130 }
2131
2132 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
2133 if (!tpg) {
2134 pr_err("Unable to allocate struct sbp_tpg\n");
2135 return ERR_PTR(-ENOMEM);
2136 }
2137
2138 tpg->tport = tport;
2139 tpg->tport_tpgt = tpgt;
2140 tport->tpg = tpg;
2141
2142 /* default attribute values */
2143 tport->enable = 0;
2144 tport->directory_id = -1;
2145 tport->mgt_orb_timeout = 15;
2146 tport->max_reconnect_timeout = 5;
2147 tport->max_logins_per_lun = 1;
2148
2149 tport->mgt_agt = sbp_management_agent_register(tport);
2150 if (IS_ERR(tport->mgt_agt)) {
2151 ret = PTR_ERR(tport->mgt_agt);
e1fe2060 2152 goto out_free_tpg;
a511ce33
CB		 2153 }
2154
9ac8928e 2155 ret = core_tpg_register(&sbp_ops, wwn, &tpg->se_tpg, tpg,
a511ce33 2156 TRANSPORT_TPG_TYPE_NORMAL);
e1fe2060
CB		 2157 if (ret < 0)
2158 goto out_unreg_mgt_agt;
a511ce33
CB		 2159
2160 return &tpg->se_tpg;
e1fe2060
CB		 2161
2162out_unreg_mgt_agt:
2163 sbp_management_agent_unregister(tport->mgt_agt);
2164out_free_tpg:
2165 tport->tpg = NULL;
2166 kfree(tpg);
2167 return ERR_PTR(ret);
a511ce33
CB		 2168}
2169
2170static void sbp_drop_tpg(struct se_portal_group *se_tpg)
2171{
2172 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2173 struct sbp_tport *tport = tpg->tport;
2174
2175 core_tpg_deregister(se_tpg);
2176 sbp_management_agent_unregister(tport->mgt_agt);
2177 tport->tpg = NULL;
2178 kfree(tpg);
2179}
2180
2181static struct se_wwn *sbp_make_tport(
2182 struct target_fabric_configfs *tf,
2183 struct config_group *group,
2184 const char *name)
2185{
2186 struct sbp_tport *tport;
2187 u64 guid = 0;
2188
343d475d 2189 if (sbp_parse_wwn(name, &guid) < 0)
a511ce33
CB		 2190 return ERR_PTR(-EINVAL);
2191
2192 tport = kzalloc(sizeof(*tport), GFP_KERNEL);
2193 if (!tport) {
2194 pr_err("Unable to allocate struct sbp_tport\n");
2195 return ERR_PTR(-ENOMEM);
2196 }
2197
2198 tport->guid = guid;
2199 sbp_format_wwn(tport->tport_name, SBP_NAMELEN, guid);
2200
2201 return &tport->tport_wwn;
2202}
2203
2204static void sbp_drop_tport(struct se_wwn *wwn)
2205{
2206 struct sbp_tport *tport =
2207 container_of(wwn, struct sbp_tport, tport_wwn);
2208
2209 kfree(tport);
2210}
2211
2212static ssize_t sbp_wwn_show_attr_version(
2213 struct target_fabric_configfs *tf,
2214 char *page)
2215{
2216 return sprintf(page, "FireWire SBP fabric module %s\n", SBP_VERSION);
2217}
2218
2219TF_WWN_ATTR_RO(sbp, version);
2220
2221static struct configfs_attribute *sbp_wwn_attrs[] = {
2222 &sbp_wwn_version.attr,
2223 NULL,
2224};
2225
2226static ssize_t sbp_tpg_show_directory_id(
2227 struct se_portal_group *se_tpg,
2228 char *page)
2229{
2230 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2231 struct sbp_tport *tport = tpg->tport;
2232
2233 if (tport->directory_id == -1)
2234 return sprintf(page, "implicit\n");
2235 else
2236 return sprintf(page, "%06x\n", tport->directory_id);
2237}
2238
2239static ssize_t sbp_tpg_store_directory_id(
2240 struct se_portal_group *se_tpg,
2241 const char *page,
2242 size_t count)
2243{
2244 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2245 struct sbp_tport *tport = tpg->tport;
2246 unsigned long val;
2247
2248 if (tport->enable) {
2249 pr_err("Cannot change the directory_id on an active target.\n");
2250 return -EBUSY;
2251 }
2252
2253 if (strstr(page, "implicit") == page) {
2254 tport->directory_id = -1;
2255 } else {
2256 if (kstrtoul(page, 16, &val) < 0)
2257 return -EINVAL;
2258 if (val > 0xffffff)
2259 return -EINVAL;
2260
2261 tport->directory_id = val;
2262 }
2263
2264 return count;
2265}
2266
2267static ssize_t sbp_tpg_show_enable(
2268 struct se_portal_group *se_tpg,
2269 char *page)
2270{
2271 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2272 struct sbp_tport *tport = tpg->tport;
2273 return sprintf(page, "%d\n", tport->enable);
2274}
2275
2276static ssize_t sbp_tpg_store_enable(
2277 struct se_portal_group *se_tpg,
2278 const char *page,
2279 size_t count)
2280{
2281 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2282 struct sbp_tport *tport = tpg->tport;
2283 unsigned long val;
2284 int ret;
2285
2286 if (kstrtoul(page, 0, &val) < 0)
2287 return -EINVAL;
2288 if ((val != 0) && (val != 1))
2289 return -EINVAL;
2290
2291 if (tport->enable == val)
2292 return count;
2293
2294 if (val) {
2295 if (sbp_count_se_tpg_luns(&tpg->se_tpg) == 0) {
2296 pr_err("Cannot enable a target with no LUNs!\n");
2297 return -EINVAL;
2298 }
2299 } else {
2300 /* XXX: force-shutdown sessions instead? */
2301 spin_lock_bh(&se_tpg->session_lock);
2302 if (!list_empty(&se_tpg->tpg_sess_list)) {
2303 spin_unlock_bh(&se_tpg->session_lock);
2304 return -EBUSY;
2305 }
2306 spin_unlock_bh(&se_tpg->session_lock);
2307 }
2308
2309 tport->enable = val;
2310
2311 ret = sbp_update_unit_directory(tport);
2312 if (ret < 0) {
2313 pr_err("Could not update Config ROM\n");
2314 return ret;
2315 }
2316
2317 return count;
2318}
2319
2320TF_TPG_BASE_ATTR(sbp, directory_id, S_IRUGO | S_IWUSR);
2321TF_TPG_BASE_ATTR(sbp, enable, S_IRUGO | S_IWUSR);
2322
2323static struct configfs_attribute *sbp_tpg_base_attrs[] = {
2324 &sbp_tpg_directory_id.attr,
2325 &sbp_tpg_enable.attr,
2326 NULL,
2327};
2328
2329static ssize_t sbp_tpg_attrib_show_mgt_orb_timeout(
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->mgt_orb_timeout);
2336}
2337
2338static ssize_t sbp_tpg_attrib_store_mgt_orb_timeout(
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 < 1) || (val > 127))
2351 return -EINVAL;
2352
2353 if (tport->mgt_orb_timeout == val)
2354 return count;
2355
2356 tport->mgt_orb_timeout = val;
2357
2358 ret = sbp_update_unit_directory(tport);
2359 if (ret < 0)
2360 return ret;
2361
2362 return count;
2363}
2364
2365static ssize_t sbp_tpg_attrib_show_max_reconnect_timeout(
2366 struct se_portal_group *se_tpg,
2367 char *page)
2368{
2369 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2370 struct sbp_tport *tport = tpg->tport;
2371 return sprintf(page, "%d\n", tport->max_reconnect_timeout);
2372}
2373
2374static ssize_t sbp_tpg_attrib_store_max_reconnect_timeout(
2375 struct se_portal_group *se_tpg,
2376 const char *page,
2377 size_t count)
2378{
2379 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2380 struct sbp_tport *tport = tpg->tport;
2381 unsigned long val;
2382 int ret;
2383
2384 if (kstrtoul(page, 0, &val) < 0)
2385 return -EINVAL;
2386 if ((val < 1) || (val > 32767))
2387 return -EINVAL;
2388
2389 if (tport->max_reconnect_timeout == val)
2390 return count;
2391
2392 tport->max_reconnect_timeout = val;
2393
2394 ret = sbp_update_unit_directory(tport);
2395 if (ret < 0)
2396 return ret;
2397
2398 return count;
2399}
2400
2401static ssize_t sbp_tpg_attrib_show_max_logins_per_lun(
2402 struct se_portal_group *se_tpg,
2403 char *page)
2404{
2405 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2406 struct sbp_tport *tport = tpg->tport;
2407 return sprintf(page, "%d\n", tport->max_logins_per_lun);
2408}
2409
2410static ssize_t sbp_tpg_attrib_store_max_logins_per_lun(
2411 struct se_portal_group *se_tpg,
2412 const char *page,
2413 size_t count)
2414{
2415 struct sbp_tpg *tpg = container_of(se_tpg, struct sbp_tpg, se_tpg);
2416 struct sbp_tport *tport = tpg->tport;
2417 unsigned long val;
2418
2419 if (kstrtoul(page, 0, &val) < 0)
2420 return -EINVAL;
2421 if ((val < 1) || (val > 127))
2422 return -EINVAL;
2423
2424 /* XXX: also check against current count? */
2425
2426 tport->max_logins_per_lun = val;
2427
2428 return count;
2429}
2430
2431TF_TPG_ATTRIB_ATTR(sbp, mgt_orb_timeout, S_IRUGO | S_IWUSR);
2432TF_TPG_ATTRIB_ATTR(sbp, max_reconnect_timeout, S_IRUGO | S_IWUSR);
2433TF_TPG_ATTRIB_ATTR(sbp, max_logins_per_lun, S_IRUGO | S_IWUSR);
2434
2435static struct configfs_attribute *sbp_tpg_attrib_attrs[] = {
2436 &sbp_tpg_attrib_mgt_orb_timeout.attr,
2437 &sbp_tpg_attrib_max_reconnect_timeout.attr,
2438 &sbp_tpg_attrib_max_logins_per_lun.attr,
2439 NULL,
2440};
2441
9ac8928e
CH		 2442static const struct target_core_fabric_ops sbp_ops = {
2443 .module = THIS_MODULE,
2444 .name = "sbp",
a511ce33
CB		 2445 .get_fabric_name = sbp_get_fabric_name,
2446 .get_fabric_proto_ident = sbp_get_fabric_proto_ident,
2447 .tpg_get_wwn = sbp_get_fabric_wwn,
2448 .tpg_get_tag = sbp_get_tag,
a511ce33
CB		 2449 .tpg_get_pr_transport_id = sbp_get_pr_transport_id,
2450 .tpg_get_pr_transport_id_len = sbp_get_pr_transport_id_len,
2451 .tpg_parse_pr_out_transport_id = sbp_parse_pr_out_transport_id,
2452 .tpg_check_demo_mode = sbp_check_true,
2453 .tpg_check_demo_mode_cache = sbp_check_true,
2454 .tpg_check_demo_mode_write_protect = sbp_check_false,
2455 .tpg_check_prod_mode_write_protect = sbp_check_false,
a511ce33
CB		 2456 .tpg_get_inst_index = sbp_tpg_get_inst_index,
2457 .release_cmd = sbp_release_cmd,
2458 .shutdown_session = sbp_shutdown_session,
2459 .close_session = sbp_close_session,
2460 .sess_get_index = sbp_sess_get_index,
2461 .write_pending = sbp_write_pending,
2462 .write_pending_status = sbp_write_pending_status,
2463 .set_default_node_attributes = sbp_set_default_node_attrs,
2464 .get_task_tag = sbp_get_task_tag,
2465 .get_cmd_state = sbp_get_cmd_state,
2466 .queue_data_in = sbp_queue_data_in,
2467 .queue_status = sbp_queue_status,
2468 .queue_tm_rsp = sbp_queue_tm_rsp,
131e6abc 2469 .aborted_task = sbp_aborted_task,
a511ce33
CB		 2470 .check_stop_free = sbp_check_stop_free,
2471
2472 .fabric_make_wwn = sbp_make_tport,
2473 .fabric_drop_wwn = sbp_drop_tport,
2474 .fabric_make_tpg = sbp_make_tpg,
2475 .fabric_drop_tpg = sbp_drop_tpg,
2476 .fabric_post_link = sbp_post_link_lun,
2477 .fabric_pre_unlink = sbp_pre_unlink_lun,
2478 .fabric_make_np = NULL,
2479 .fabric_drop_np = NULL,
c7d6a803 2480 .fabric_init_nodeacl = sbp_init_nodeacl,
a511ce33 2481
9ac8928e
CH		 2482 .tfc_wwn_attrs = sbp_wwn_attrs,
2483 .tfc_tpg_base_attrs = sbp_tpg_base_attrs,
2484 .tfc_tpg_attrib_attrs = sbp_tpg_attrib_attrs,
a511ce33
CB		 2485};
2486
2487static int __init sbp_init(void)
2488{
9ac8928e 2489 return target_register_template(&sbp_ops);
a511ce33
CB		 2490};
2491
63b91d5a 2492static void __exit sbp_exit(void)
a511ce33 2493{
9ac8928e 2494 target_unregister_template(&sbp_ops);
a511ce33
CB		 2495};
2496
2497MODULE_DESCRIPTION("FireWire SBP fabric driver");
2498MODULE_LICENSE("GPL");
2499module_init(sbp_init);
2500module_exit(sbp_exit);
Linux 6.x block layer and io_uring tree(s)