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