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