1 /******************************************************************************* 2 * Filename: target_core_transport.c 3 * 4 * This file contains the Generic Target Engine Core. 5 * 6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. 7 * Copyright (c) 2005, 2006, 2007 SBE, Inc. 8 * Copyright (c) 2007-2010 Rising Tide Systems 9 * Copyright (c) 2008-2010 Linux-iSCSI.org 10 * 11 * Nicholas A. Bellinger <nab@kernel.org> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 26 * 27 ******************************************************************************/ 28 29 #include <linux/net.h> 30 #include <linux/delay.h> 31 #include <linux/string.h> 32 #include <linux/timer.h> 33 #include <linux/slab.h> 34 #include <linux/blkdev.h> 35 #include <linux/spinlock.h> 36 #include <linux/kthread.h> 37 #include <linux/in.h> 38 #include <linux/cdrom.h> 39 #include <linux/module.h> 40 #include <linux/ratelimit.h> 41 #include <asm/unaligned.h> 42 #include <net/sock.h> 43 #include <net/tcp.h> 44 #include <scsi/scsi.h> 45 #include <scsi/scsi_cmnd.h> 46 #include <scsi/scsi_tcq.h> 47 48 #include <target/target_core_base.h> 49 #include <target/target_core_backend.h> 50 #include <target/target_core_fabric.h> 51 #include <target/target_core_configfs.h> 52 53 #include "target_core_internal.h" 54 #include "target_core_alua.h" 55 #include "target_core_pr.h" 56 #include "target_core_ua.h" 57 58 static int sub_api_initialized; 59 60 static struct workqueue_struct *target_completion_wq; 61 static struct kmem_cache *se_sess_cache; 62 struct kmem_cache *se_ua_cache; 63 struct kmem_cache *t10_pr_reg_cache; 64 struct kmem_cache *t10_alua_lu_gp_cache; 65 struct kmem_cache *t10_alua_lu_gp_mem_cache; 66 struct kmem_cache *t10_alua_tg_pt_gp_cache; 67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; 68 69 static void transport_complete_task_attr(struct se_cmd *cmd); 70 static void transport_handle_queue_full(struct se_cmd *cmd, 71 struct se_device *dev); 72 static int transport_generic_get_mem(struct se_cmd *cmd); 73 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool); 74 static void transport_put_cmd(struct se_cmd *cmd); 75 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); 76 static void target_complete_ok_work(struct work_struct *work); 77 78 int init_se_kmem_caches(void) 79 { 80 se_sess_cache = kmem_cache_create("se_sess_cache", 81 sizeof(struct se_session), __alignof__(struct se_session), 82 0, NULL); 83 if (!se_sess_cache) { 84 pr_err("kmem_cache_create() for struct se_session" 85 " failed\n"); 86 goto out; 87 } 88 se_ua_cache = kmem_cache_create("se_ua_cache", 89 sizeof(struct se_ua), __alignof__(struct se_ua), 90 0, NULL); 91 if (!se_ua_cache) { 92 pr_err("kmem_cache_create() for struct se_ua failed\n"); 93 goto out_free_sess_cache; 94 } 95 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", 96 sizeof(struct t10_pr_registration), 97 __alignof__(struct t10_pr_registration), 0, NULL); 98 if (!t10_pr_reg_cache) { 99 pr_err("kmem_cache_create() for struct t10_pr_registration" 100 " failed\n"); 101 goto out_free_ua_cache; 102 } 103 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", 104 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), 105 0, NULL); 106 if (!t10_alua_lu_gp_cache) { 107 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" 108 " failed\n"); 109 goto out_free_pr_reg_cache; 110 } 111 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", 112 sizeof(struct t10_alua_lu_gp_member), 113 __alignof__(struct t10_alua_lu_gp_member), 0, NULL); 114 if (!t10_alua_lu_gp_mem_cache) { 115 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" 116 "cache failed\n"); 117 goto out_free_lu_gp_cache; 118 } 119 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", 120 sizeof(struct t10_alua_tg_pt_gp), 121 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); 122 if (!t10_alua_tg_pt_gp_cache) { 123 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" 124 "cache failed\n"); 125 goto out_free_lu_gp_mem_cache; 126 } 127 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( 128 "t10_alua_tg_pt_gp_mem_cache", 129 sizeof(struct t10_alua_tg_pt_gp_member), 130 __alignof__(struct t10_alua_tg_pt_gp_member), 131 0, NULL); 132 if (!t10_alua_tg_pt_gp_mem_cache) { 133 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" 134 "mem_t failed\n"); 135 goto out_free_tg_pt_gp_cache; 136 } 137 138 target_completion_wq = alloc_workqueue("target_completion", 139 WQ_MEM_RECLAIM, 0); 140 if (!target_completion_wq) 141 goto out_free_tg_pt_gp_mem_cache; 142 143 return 0; 144 145 out_free_tg_pt_gp_mem_cache: 146 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); 147 out_free_tg_pt_gp_cache: 148 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 149 out_free_lu_gp_mem_cache: 150 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 151 out_free_lu_gp_cache: 152 kmem_cache_destroy(t10_alua_lu_gp_cache); 153 out_free_pr_reg_cache: 154 kmem_cache_destroy(t10_pr_reg_cache); 155 out_free_ua_cache: 156 kmem_cache_destroy(se_ua_cache); 157 out_free_sess_cache: 158 kmem_cache_destroy(se_sess_cache); 159 out: 160 return -ENOMEM; 161 } 162 163 void release_se_kmem_caches(void) 164 { 165 destroy_workqueue(target_completion_wq); 166 kmem_cache_destroy(se_sess_cache); 167 kmem_cache_destroy(se_ua_cache); 168 kmem_cache_destroy(t10_pr_reg_cache); 169 kmem_cache_destroy(t10_alua_lu_gp_cache); 170 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 171 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 172 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); 173 } 174 175 /* This code ensures unique mib indexes are handed out. */ 176 static DEFINE_SPINLOCK(scsi_mib_index_lock); 177 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; 178 179 /* 180 * Allocate a new row index for the entry type specified 181 */ 182 u32 scsi_get_new_index(scsi_index_t type) 183 { 184 u32 new_index; 185 186 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); 187 188 spin_lock(&scsi_mib_index_lock); 189 new_index = ++scsi_mib_index[type]; 190 spin_unlock(&scsi_mib_index_lock); 191 192 return new_index; 193 } 194 195 void transport_subsystem_check_init(void) 196 { 197 int ret; 198 199 if (sub_api_initialized) 200 return; 201 202 ret = request_module("target_core_iblock"); 203 if (ret != 0) 204 pr_err("Unable to load target_core_iblock\n"); 205 206 ret = request_module("target_core_file"); 207 if (ret != 0) 208 pr_err("Unable to load target_core_file\n"); 209 210 ret = request_module("target_core_pscsi"); 211 if (ret != 0) 212 pr_err("Unable to load target_core_pscsi\n"); 213 214 ret = request_module("target_core_stgt"); 215 if (ret != 0) 216 pr_err("Unable to load target_core_stgt\n"); 217 218 sub_api_initialized = 1; 219 return; 220 } 221 222 struct se_session *transport_init_session(void) 223 { 224 struct se_session *se_sess; 225 226 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); 227 if (!se_sess) { 228 pr_err("Unable to allocate struct se_session from" 229 " se_sess_cache\n"); 230 return ERR_PTR(-ENOMEM); 231 } 232 INIT_LIST_HEAD(&se_sess->sess_list); 233 INIT_LIST_HEAD(&se_sess->sess_acl_list); 234 INIT_LIST_HEAD(&se_sess->sess_cmd_list); 235 spin_lock_init(&se_sess->sess_cmd_lock); 236 kref_init(&se_sess->sess_kref); 237 238 return se_sess; 239 } 240 EXPORT_SYMBOL(transport_init_session); 241 242 /* 243 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. 244 */ 245 void __transport_register_session( 246 struct se_portal_group *se_tpg, 247 struct se_node_acl *se_nacl, 248 struct se_session *se_sess, 249 void *fabric_sess_ptr) 250 { 251 unsigned char buf[PR_REG_ISID_LEN]; 252 253 se_sess->se_tpg = se_tpg; 254 se_sess->fabric_sess_ptr = fabric_sess_ptr; 255 /* 256 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t 257 * 258 * Only set for struct se_session's that will actually be moving I/O. 259 * eg: *NOT* discovery sessions. 260 */ 261 if (se_nacl) { 262 /* 263 * If the fabric module supports an ISID based TransportID, 264 * save this value in binary from the fabric I_T Nexus now. 265 */ 266 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 267 memset(&buf[0], 0, PR_REG_ISID_LEN); 268 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, 269 &buf[0], PR_REG_ISID_LEN); 270 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); 271 } 272 kref_get(&se_nacl->acl_kref); 273 274 spin_lock_irq(&se_nacl->nacl_sess_lock); 275 /* 276 * The se_nacl->nacl_sess pointer will be set to the 277 * last active I_T Nexus for each struct se_node_acl. 278 */ 279 se_nacl->nacl_sess = se_sess; 280 281 list_add_tail(&se_sess->sess_acl_list, 282 &se_nacl->acl_sess_list); 283 spin_unlock_irq(&se_nacl->nacl_sess_lock); 284 } 285 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); 286 287 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", 288 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); 289 } 290 EXPORT_SYMBOL(__transport_register_session); 291 292 void transport_register_session( 293 struct se_portal_group *se_tpg, 294 struct se_node_acl *se_nacl, 295 struct se_session *se_sess, 296 void *fabric_sess_ptr) 297 { 298 unsigned long flags; 299 300 spin_lock_irqsave(&se_tpg->session_lock, flags); 301 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); 302 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 303 } 304 EXPORT_SYMBOL(transport_register_session); 305 306 void target_release_session(struct kref *kref) 307 { 308 struct se_session *se_sess = container_of(kref, 309 struct se_session, sess_kref); 310 struct se_portal_group *se_tpg = se_sess->se_tpg; 311 312 se_tpg->se_tpg_tfo->close_session(se_sess); 313 } 314 315 void target_get_session(struct se_session *se_sess) 316 { 317 kref_get(&se_sess->sess_kref); 318 } 319 EXPORT_SYMBOL(target_get_session); 320 321 void target_put_session(struct se_session *se_sess) 322 { 323 struct se_portal_group *tpg = se_sess->se_tpg; 324 325 if (tpg->se_tpg_tfo->put_session != NULL) { 326 tpg->se_tpg_tfo->put_session(se_sess); 327 return; 328 } 329 kref_put(&se_sess->sess_kref, target_release_session); 330 } 331 EXPORT_SYMBOL(target_put_session); 332 333 static void target_complete_nacl(struct kref *kref) 334 { 335 struct se_node_acl *nacl = container_of(kref, 336 struct se_node_acl, acl_kref); 337 338 complete(&nacl->acl_free_comp); 339 } 340 341 void target_put_nacl(struct se_node_acl *nacl) 342 { 343 kref_put(&nacl->acl_kref, target_complete_nacl); 344 } 345 346 void transport_deregister_session_configfs(struct se_session *se_sess) 347 { 348 struct se_node_acl *se_nacl; 349 unsigned long flags; 350 /* 351 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session 352 */ 353 se_nacl = se_sess->se_node_acl; 354 if (se_nacl) { 355 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); 356 if (se_nacl->acl_stop == 0) 357 list_del(&se_sess->sess_acl_list); 358 /* 359 * If the session list is empty, then clear the pointer. 360 * Otherwise, set the struct se_session pointer from the tail 361 * element of the per struct se_node_acl active session list. 362 */ 363 if (list_empty(&se_nacl->acl_sess_list)) 364 se_nacl->nacl_sess = NULL; 365 else { 366 se_nacl->nacl_sess = container_of( 367 se_nacl->acl_sess_list.prev, 368 struct se_session, sess_acl_list); 369 } 370 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); 371 } 372 } 373 EXPORT_SYMBOL(transport_deregister_session_configfs); 374 375 void transport_free_session(struct se_session *se_sess) 376 { 377 kmem_cache_free(se_sess_cache, se_sess); 378 } 379 EXPORT_SYMBOL(transport_free_session); 380 381 void transport_deregister_session(struct se_session *se_sess) 382 { 383 struct se_portal_group *se_tpg = se_sess->se_tpg; 384 struct target_core_fabric_ops *se_tfo; 385 struct se_node_acl *se_nacl; 386 unsigned long flags; 387 bool comp_nacl = true; 388 389 if (!se_tpg) { 390 transport_free_session(se_sess); 391 return; 392 } 393 se_tfo = se_tpg->se_tpg_tfo; 394 395 spin_lock_irqsave(&se_tpg->session_lock, flags); 396 list_del(&se_sess->sess_list); 397 se_sess->se_tpg = NULL; 398 se_sess->fabric_sess_ptr = NULL; 399 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 400 401 /* 402 * Determine if we need to do extra work for this initiator node's 403 * struct se_node_acl if it had been previously dynamically generated. 404 */ 405 se_nacl = se_sess->se_node_acl; 406 407 spin_lock_irqsave(&se_tpg->acl_node_lock, flags); 408 if (se_nacl && se_nacl->dynamic_node_acl) { 409 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { 410 list_del(&se_nacl->acl_list); 411 se_tpg->num_node_acls--; 412 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); 413 core_tpg_wait_for_nacl_pr_ref(se_nacl); 414 core_free_device_list_for_node(se_nacl, se_tpg); 415 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); 416 417 comp_nacl = false; 418 spin_lock_irqsave(&se_tpg->acl_node_lock, flags); 419 } 420 } 421 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); 422 423 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", 424 se_tpg->se_tpg_tfo->get_fabric_name()); 425 /* 426 * If last kref is dropping now for an explict NodeACL, awake sleeping 427 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group 428 * removal context. 429 */ 430 if (se_nacl && comp_nacl == true) 431 target_put_nacl(se_nacl); 432 433 transport_free_session(se_sess); 434 } 435 EXPORT_SYMBOL(transport_deregister_session); 436 437 /* 438 * Called with cmd->t_state_lock held. 439 */ 440 static void target_remove_from_state_list(struct se_cmd *cmd) 441 { 442 struct se_device *dev = cmd->se_dev; 443 unsigned long flags; 444 445 if (!dev) 446 return; 447 448 if (cmd->transport_state & CMD_T_BUSY) 449 return; 450 451 spin_lock_irqsave(&dev->execute_task_lock, flags); 452 if (cmd->state_active) { 453 list_del(&cmd->state_list); 454 cmd->state_active = false; 455 } 456 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 457 } 458 459 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists) 460 { 461 unsigned long flags; 462 463 spin_lock_irqsave(&cmd->t_state_lock, flags); 464 /* 465 * Determine if IOCTL context caller in requesting the stopping of this 466 * command for LUN shutdown purposes. 467 */ 468 if (cmd->transport_state & CMD_T_LUN_STOP) { 469 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", 470 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); 471 472 cmd->transport_state &= ~CMD_T_ACTIVE; 473 if (remove_from_lists) 474 target_remove_from_state_list(cmd); 475 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 476 477 complete(&cmd->transport_lun_stop_comp); 478 return 1; 479 } 480 481 if (remove_from_lists) { 482 target_remove_from_state_list(cmd); 483 484 /* 485 * Clear struct se_cmd->se_lun before the handoff to FE. 486 */ 487 cmd->se_lun = NULL; 488 } 489 490 /* 491 * Determine if frontend context caller is requesting the stopping of 492 * this command for frontend exceptions. 493 */ 494 if (cmd->transport_state & CMD_T_STOP) { 495 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", 496 __func__, __LINE__, 497 cmd->se_tfo->get_task_tag(cmd)); 498 499 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 500 501 complete(&cmd->t_transport_stop_comp); 502 return 1; 503 } 504 505 cmd->transport_state &= ~CMD_T_ACTIVE; 506 if (remove_from_lists) { 507 /* 508 * Some fabric modules like tcm_loop can release 509 * their internally allocated I/O reference now and 510 * struct se_cmd now. 511 * 512 * Fabric modules are expected to return '1' here if the 513 * se_cmd being passed is released at this point, 514 * or zero if not being released. 515 */ 516 if (cmd->se_tfo->check_stop_free != NULL) { 517 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 518 return cmd->se_tfo->check_stop_free(cmd); 519 } 520 } 521 522 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 523 return 0; 524 } 525 526 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) 527 { 528 return transport_cmd_check_stop(cmd, true); 529 } 530 531 static void transport_lun_remove_cmd(struct se_cmd *cmd) 532 { 533 struct se_lun *lun = cmd->se_lun; 534 unsigned long flags; 535 536 if (!lun) 537 return; 538 539 spin_lock_irqsave(&cmd->t_state_lock, flags); 540 if (cmd->transport_state & CMD_T_DEV_ACTIVE) { 541 cmd->transport_state &= ~CMD_T_DEV_ACTIVE; 542 target_remove_from_state_list(cmd); 543 } 544 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 545 546 spin_lock_irqsave(&lun->lun_cmd_lock, flags); 547 if (!list_empty(&cmd->se_lun_node)) 548 list_del_init(&cmd->se_lun_node); 549 spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); 550 } 551 552 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) 553 { 554 if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 555 transport_lun_remove_cmd(cmd); 556 557 if (transport_cmd_check_stop_to_fabric(cmd)) 558 return; 559 if (remove) 560 transport_put_cmd(cmd); 561 } 562 563 static void target_complete_failure_work(struct work_struct *work) 564 { 565 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 566 567 transport_generic_request_failure(cmd); 568 } 569 570 /* 571 * Used when asking transport to copy Sense Data from the underlying 572 * Linux/SCSI struct scsi_cmnd 573 */ 574 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) 575 { 576 unsigned char *buffer = cmd->sense_buffer; 577 struct se_device *dev = cmd->se_dev; 578 u32 offset = 0; 579 580 WARN_ON(!cmd->se_lun); 581 582 if (!dev) 583 return NULL; 584 585 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) 586 return NULL; 587 588 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER); 589 590 /* Automatically padded */ 591 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; 592 593 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", 594 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); 595 return &buffer[offset]; 596 } 597 598 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) 599 { 600 struct se_device *dev = cmd->se_dev; 601 int success = scsi_status == GOOD; 602 unsigned long flags; 603 604 cmd->scsi_status = scsi_status; 605 606 607 spin_lock_irqsave(&cmd->t_state_lock, flags); 608 cmd->transport_state &= ~CMD_T_BUSY; 609 610 if (dev && dev->transport->transport_complete) { 611 dev->transport->transport_complete(cmd, 612 cmd->t_data_sg, 613 transport_get_sense_buffer(cmd)); 614 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) 615 success = 1; 616 } 617 618 /* 619 * See if we are waiting to complete for an exception condition. 620 */ 621 if (cmd->transport_state & CMD_T_REQUEST_STOP) { 622 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 623 complete(&cmd->task_stop_comp); 624 return; 625 } 626 627 if (!success) 628 cmd->transport_state |= CMD_T_FAILED; 629 630 /* 631 * Check for case where an explict ABORT_TASK has been received 632 * and transport_wait_for_tasks() will be waiting for completion.. 633 */ 634 if (cmd->transport_state & CMD_T_ABORTED && 635 cmd->transport_state & CMD_T_STOP) { 636 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 637 complete(&cmd->t_transport_stop_comp); 638 return; 639 } else if (cmd->transport_state & CMD_T_FAILED) { 640 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 641 INIT_WORK(&cmd->work, target_complete_failure_work); 642 } else { 643 INIT_WORK(&cmd->work, target_complete_ok_work); 644 } 645 646 cmd->t_state = TRANSPORT_COMPLETE; 647 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); 648 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 649 650 queue_work(target_completion_wq, &cmd->work); 651 } 652 EXPORT_SYMBOL(target_complete_cmd); 653 654 static void target_add_to_state_list(struct se_cmd *cmd) 655 { 656 struct se_device *dev = cmd->se_dev; 657 unsigned long flags; 658 659 spin_lock_irqsave(&dev->execute_task_lock, flags); 660 if (!cmd->state_active) { 661 list_add_tail(&cmd->state_list, &dev->state_list); 662 cmd->state_active = true; 663 } 664 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 665 } 666 667 /* 668 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status 669 */ 670 static void transport_write_pending_qf(struct se_cmd *cmd); 671 static void transport_complete_qf(struct se_cmd *cmd); 672 673 static void target_qf_do_work(struct work_struct *work) 674 { 675 struct se_device *dev = container_of(work, struct se_device, 676 qf_work_queue); 677 LIST_HEAD(qf_cmd_list); 678 struct se_cmd *cmd, *cmd_tmp; 679 680 spin_lock_irq(&dev->qf_cmd_lock); 681 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); 682 spin_unlock_irq(&dev->qf_cmd_lock); 683 684 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { 685 list_del(&cmd->se_qf_node); 686 atomic_dec(&dev->dev_qf_count); 687 smp_mb__after_atomic_dec(); 688 689 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" 690 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, 691 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : 692 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" 693 : "UNKNOWN"); 694 695 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) 696 transport_write_pending_qf(cmd); 697 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) 698 transport_complete_qf(cmd); 699 } 700 } 701 702 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) 703 { 704 switch (cmd->data_direction) { 705 case DMA_NONE: 706 return "NONE"; 707 case DMA_FROM_DEVICE: 708 return "READ"; 709 case DMA_TO_DEVICE: 710 return "WRITE"; 711 case DMA_BIDIRECTIONAL: 712 return "BIDI"; 713 default: 714 break; 715 } 716 717 return "UNKNOWN"; 718 } 719 720 void transport_dump_dev_state( 721 struct se_device *dev, 722 char *b, 723 int *bl) 724 { 725 *bl += sprintf(b + *bl, "Status: "); 726 switch (dev->dev_status) { 727 case TRANSPORT_DEVICE_ACTIVATED: 728 *bl += sprintf(b + *bl, "ACTIVATED"); 729 break; 730 case TRANSPORT_DEVICE_DEACTIVATED: 731 *bl += sprintf(b + *bl, "DEACTIVATED"); 732 break; 733 case TRANSPORT_DEVICE_SHUTDOWN: 734 *bl += sprintf(b + *bl, "SHUTDOWN"); 735 break; 736 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: 737 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: 738 *bl += sprintf(b + *bl, "OFFLINE"); 739 break; 740 default: 741 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); 742 break; 743 } 744 745 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); 746 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", 747 dev->se_sub_dev->se_dev_attrib.block_size, 748 dev->se_sub_dev->se_dev_attrib.hw_max_sectors); 749 *bl += sprintf(b + *bl, " "); 750 } 751 752 void transport_dump_vpd_proto_id( 753 struct t10_vpd *vpd, 754 unsigned char *p_buf, 755 int p_buf_len) 756 { 757 unsigned char buf[VPD_TMP_BUF_SIZE]; 758 int len; 759 760 memset(buf, 0, VPD_TMP_BUF_SIZE); 761 len = sprintf(buf, "T10 VPD Protocol Identifier: "); 762 763 switch (vpd->protocol_identifier) { 764 case 0x00: 765 sprintf(buf+len, "Fibre Channel\n"); 766 break; 767 case 0x10: 768 sprintf(buf+len, "Parallel SCSI\n"); 769 break; 770 case 0x20: 771 sprintf(buf+len, "SSA\n"); 772 break; 773 case 0x30: 774 sprintf(buf+len, "IEEE 1394\n"); 775 break; 776 case 0x40: 777 sprintf(buf+len, "SCSI Remote Direct Memory Access" 778 " Protocol\n"); 779 break; 780 case 0x50: 781 sprintf(buf+len, "Internet SCSI (iSCSI)\n"); 782 break; 783 case 0x60: 784 sprintf(buf+len, "SAS Serial SCSI Protocol\n"); 785 break; 786 case 0x70: 787 sprintf(buf+len, "Automation/Drive Interface Transport" 788 " Protocol\n"); 789 break; 790 case 0x80: 791 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); 792 break; 793 default: 794 sprintf(buf+len, "Unknown 0x%02x\n", 795 vpd->protocol_identifier); 796 break; 797 } 798 799 if (p_buf) 800 strncpy(p_buf, buf, p_buf_len); 801 else 802 pr_debug("%s", buf); 803 } 804 805 void 806 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) 807 { 808 /* 809 * Check if the Protocol Identifier Valid (PIV) bit is set.. 810 * 811 * from spc3r23.pdf section 7.5.1 812 */ 813 if (page_83[1] & 0x80) { 814 vpd->protocol_identifier = (page_83[0] & 0xf0); 815 vpd->protocol_identifier_set = 1; 816 transport_dump_vpd_proto_id(vpd, NULL, 0); 817 } 818 } 819 EXPORT_SYMBOL(transport_set_vpd_proto_id); 820 821 int transport_dump_vpd_assoc( 822 struct t10_vpd *vpd, 823 unsigned char *p_buf, 824 int p_buf_len) 825 { 826 unsigned char buf[VPD_TMP_BUF_SIZE]; 827 int ret = 0; 828 int len; 829 830 memset(buf, 0, VPD_TMP_BUF_SIZE); 831 len = sprintf(buf, "T10 VPD Identifier Association: "); 832 833 switch (vpd->association) { 834 case 0x00: 835 sprintf(buf+len, "addressed logical unit\n"); 836 break; 837 case 0x10: 838 sprintf(buf+len, "target port\n"); 839 break; 840 case 0x20: 841 sprintf(buf+len, "SCSI target device\n"); 842 break; 843 default: 844 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); 845 ret = -EINVAL; 846 break; 847 } 848 849 if (p_buf) 850 strncpy(p_buf, buf, p_buf_len); 851 else 852 pr_debug("%s", buf); 853 854 return ret; 855 } 856 857 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) 858 { 859 /* 860 * The VPD identification association.. 861 * 862 * from spc3r23.pdf Section 7.6.3.1 Table 297 863 */ 864 vpd->association = (page_83[1] & 0x30); 865 return transport_dump_vpd_assoc(vpd, NULL, 0); 866 } 867 EXPORT_SYMBOL(transport_set_vpd_assoc); 868 869 int transport_dump_vpd_ident_type( 870 struct t10_vpd *vpd, 871 unsigned char *p_buf, 872 int p_buf_len) 873 { 874 unsigned char buf[VPD_TMP_BUF_SIZE]; 875 int ret = 0; 876 int len; 877 878 memset(buf, 0, VPD_TMP_BUF_SIZE); 879 len = sprintf(buf, "T10 VPD Identifier Type: "); 880 881 switch (vpd->device_identifier_type) { 882 case 0x00: 883 sprintf(buf+len, "Vendor specific\n"); 884 break; 885 case 0x01: 886 sprintf(buf+len, "T10 Vendor ID based\n"); 887 break; 888 case 0x02: 889 sprintf(buf+len, "EUI-64 based\n"); 890 break; 891 case 0x03: 892 sprintf(buf+len, "NAA\n"); 893 break; 894 case 0x04: 895 sprintf(buf+len, "Relative target port identifier\n"); 896 break; 897 case 0x08: 898 sprintf(buf+len, "SCSI name string\n"); 899 break; 900 default: 901 sprintf(buf+len, "Unsupported: 0x%02x\n", 902 vpd->device_identifier_type); 903 ret = -EINVAL; 904 break; 905 } 906 907 if (p_buf) { 908 if (p_buf_len < strlen(buf)+1) 909 return -EINVAL; 910 strncpy(p_buf, buf, p_buf_len); 911 } else { 912 pr_debug("%s", buf); 913 } 914 915 return ret; 916 } 917 918 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) 919 { 920 /* 921 * The VPD identifier type.. 922 * 923 * from spc3r23.pdf Section 7.6.3.1 Table 298 924 */ 925 vpd->device_identifier_type = (page_83[1] & 0x0f); 926 return transport_dump_vpd_ident_type(vpd, NULL, 0); 927 } 928 EXPORT_SYMBOL(transport_set_vpd_ident_type); 929 930 int transport_dump_vpd_ident( 931 struct t10_vpd *vpd, 932 unsigned char *p_buf, 933 int p_buf_len) 934 { 935 unsigned char buf[VPD_TMP_BUF_SIZE]; 936 int ret = 0; 937 938 memset(buf, 0, VPD_TMP_BUF_SIZE); 939 940 switch (vpd->device_identifier_code_set) { 941 case 0x01: /* Binary */ 942 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", 943 &vpd->device_identifier[0]); 944 break; 945 case 0x02: /* ASCII */ 946 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", 947 &vpd->device_identifier[0]); 948 break; 949 case 0x03: /* UTF-8 */ 950 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", 951 &vpd->device_identifier[0]); 952 break; 953 default: 954 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" 955 " 0x%02x", vpd->device_identifier_code_set); 956 ret = -EINVAL; 957 break; 958 } 959 960 if (p_buf) 961 strncpy(p_buf, buf, p_buf_len); 962 else 963 pr_debug("%s", buf); 964 965 return ret; 966 } 967 968 int 969 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) 970 { 971 static const char hex_str[] = "0123456789abcdef"; 972 int j = 0, i = 4; /* offset to start of the identifer */ 973 974 /* 975 * The VPD Code Set (encoding) 976 * 977 * from spc3r23.pdf Section 7.6.3.1 Table 296 978 */ 979 vpd->device_identifier_code_set = (page_83[0] & 0x0f); 980 switch (vpd->device_identifier_code_set) { 981 case 0x01: /* Binary */ 982 vpd->device_identifier[j++] = 983 hex_str[vpd->device_identifier_type]; 984 while (i < (4 + page_83[3])) { 985 vpd->device_identifier[j++] = 986 hex_str[(page_83[i] & 0xf0) >> 4]; 987 vpd->device_identifier[j++] = 988 hex_str[page_83[i] & 0x0f]; 989 i++; 990 } 991 break; 992 case 0x02: /* ASCII */ 993 case 0x03: /* UTF-8 */ 994 while (i < (4 + page_83[3])) 995 vpd->device_identifier[j++] = page_83[i++]; 996 break; 997 default: 998 break; 999 } 1000 1001 return transport_dump_vpd_ident(vpd, NULL, 0); 1002 } 1003 EXPORT_SYMBOL(transport_set_vpd_ident); 1004 1005 static void core_setup_task_attr_emulation(struct se_device *dev) 1006 { 1007 /* 1008 * If this device is from Target_Core_Mod/pSCSI, disable the 1009 * SAM Task Attribute emulation. 1010 * 1011 * This is currently not available in upsream Linux/SCSI Target 1012 * mode code, and is assumed to be disabled while using TCM/pSCSI. 1013 */ 1014 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { 1015 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; 1016 return; 1017 } 1018 1019 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; 1020 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" 1021 " device\n", dev->transport->name, 1022 dev->transport->get_device_rev(dev)); 1023 } 1024 1025 static void scsi_dump_inquiry(struct se_device *dev) 1026 { 1027 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 1028 char buf[17]; 1029 int i, device_type; 1030 /* 1031 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer 1032 */ 1033 for (i = 0; i < 8; i++) 1034 if (wwn->vendor[i] >= 0x20) 1035 buf[i] = wwn->vendor[i]; 1036 else 1037 buf[i] = ' '; 1038 buf[i] = '\0'; 1039 pr_debug(" Vendor: %s\n", buf); 1040 1041 for (i = 0; i < 16; i++) 1042 if (wwn->model[i] >= 0x20) 1043 buf[i] = wwn->model[i]; 1044 else 1045 buf[i] = ' '; 1046 buf[i] = '\0'; 1047 pr_debug(" Model: %s\n", buf); 1048 1049 for (i = 0; i < 4; i++) 1050 if (wwn->revision[i] >= 0x20) 1051 buf[i] = wwn->revision[i]; 1052 else 1053 buf[i] = ' '; 1054 buf[i] = '\0'; 1055 pr_debug(" Revision: %s\n", buf); 1056 1057 device_type = dev->transport->get_device_type(dev); 1058 pr_debug(" Type: %s ", scsi_device_type(device_type)); 1059 pr_debug(" ANSI SCSI revision: %02x\n", 1060 dev->transport->get_device_rev(dev)); 1061 } 1062 1063 struct se_device *transport_add_device_to_core_hba( 1064 struct se_hba *hba, 1065 struct se_subsystem_api *transport, 1066 struct se_subsystem_dev *se_dev, 1067 u32 device_flags, 1068 void *transport_dev, 1069 struct se_dev_limits *dev_limits, 1070 const char *inquiry_prod, 1071 const char *inquiry_rev) 1072 { 1073 int force_pt; 1074 struct se_device *dev; 1075 1076 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); 1077 if (!dev) { 1078 pr_err("Unable to allocate memory for se_dev_t\n"); 1079 return NULL; 1080 } 1081 1082 dev->dev_flags = device_flags; 1083 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; 1084 dev->dev_ptr = transport_dev; 1085 dev->se_hba = hba; 1086 dev->se_sub_dev = se_dev; 1087 dev->transport = transport; 1088 INIT_LIST_HEAD(&dev->dev_list); 1089 INIT_LIST_HEAD(&dev->dev_sep_list); 1090 INIT_LIST_HEAD(&dev->dev_tmr_list); 1091 INIT_LIST_HEAD(&dev->delayed_cmd_list); 1092 INIT_LIST_HEAD(&dev->state_list); 1093 INIT_LIST_HEAD(&dev->qf_cmd_list); 1094 spin_lock_init(&dev->execute_task_lock); 1095 spin_lock_init(&dev->delayed_cmd_lock); 1096 spin_lock_init(&dev->dev_reservation_lock); 1097 spin_lock_init(&dev->dev_status_lock); 1098 spin_lock_init(&dev->se_port_lock); 1099 spin_lock_init(&dev->se_tmr_lock); 1100 spin_lock_init(&dev->qf_cmd_lock); 1101 atomic_set(&dev->dev_ordered_id, 0); 1102 1103 se_dev_set_default_attribs(dev, dev_limits); 1104 1105 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); 1106 dev->creation_time = get_jiffies_64(); 1107 spin_lock_init(&dev->stats_lock); 1108 1109 spin_lock(&hba->device_lock); 1110 list_add_tail(&dev->dev_list, &hba->hba_dev_list); 1111 hba->dev_count++; 1112 spin_unlock(&hba->device_lock); 1113 /* 1114 * Setup the SAM Task Attribute emulation for struct se_device 1115 */ 1116 core_setup_task_attr_emulation(dev); 1117 /* 1118 * Force PR and ALUA passthrough emulation with internal object use. 1119 */ 1120 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); 1121 /* 1122 * Setup the Reservations infrastructure for struct se_device 1123 */ 1124 core_setup_reservations(dev, force_pt); 1125 /* 1126 * Setup the Asymmetric Logical Unit Assignment for struct se_device 1127 */ 1128 if (core_setup_alua(dev, force_pt) < 0) 1129 goto err_dev_list; 1130 1131 /* 1132 * Startup the struct se_device processing thread 1133 */ 1134 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, 1135 dev->transport->name); 1136 if (!dev->tmr_wq) { 1137 pr_err("Unable to create tmr workqueue for %s\n", 1138 dev->transport->name); 1139 goto err_dev_list; 1140 } 1141 /* 1142 * Setup work_queue for QUEUE_FULL 1143 */ 1144 INIT_WORK(&dev->qf_work_queue, target_qf_do_work); 1145 /* 1146 * Preload the initial INQUIRY const values if we are doing 1147 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI 1148 * passthrough because this is being provided by the backend LLD. 1149 * This is required so that transport_get_inquiry() copies these 1150 * originals once back into DEV_T10_WWN(dev) for the virtual device 1151 * setup. 1152 */ 1153 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { 1154 if (!inquiry_prod || !inquiry_rev) { 1155 pr_err("All non TCM/pSCSI plugins require" 1156 " INQUIRY consts\n"); 1157 goto err_wq; 1158 } 1159 1160 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); 1161 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); 1162 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); 1163 } 1164 scsi_dump_inquiry(dev); 1165 1166 return dev; 1167 1168 err_wq: 1169 destroy_workqueue(dev->tmr_wq); 1170 err_dev_list: 1171 spin_lock(&hba->device_lock); 1172 list_del(&dev->dev_list); 1173 hba->dev_count--; 1174 spin_unlock(&hba->device_lock); 1175 1176 se_release_vpd_for_dev(dev); 1177 1178 kfree(dev); 1179 1180 return NULL; 1181 } 1182 EXPORT_SYMBOL(transport_add_device_to_core_hba); 1183 1184 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size) 1185 { 1186 struct se_device *dev = cmd->se_dev; 1187 1188 if (cmd->unknown_data_length) { 1189 cmd->data_length = size; 1190 } else if (size != cmd->data_length) { 1191 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" 1192 " %u does not match SCSI CDB Length: %u for SAM Opcode:" 1193 " 0x%02x\n", cmd->se_tfo->get_fabric_name(), 1194 cmd->data_length, size, cmd->t_task_cdb[0]); 1195 1196 if (cmd->data_direction == DMA_TO_DEVICE) { 1197 pr_err("Rejecting underflow/overflow" 1198 " WRITE data\n"); 1199 goto out_invalid_cdb_field; 1200 } 1201 /* 1202 * Reject READ_* or WRITE_* with overflow/underflow for 1203 * type SCF_SCSI_DATA_CDB. 1204 */ 1205 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) { 1206 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" 1207 " CDB on non 512-byte sector setup subsystem" 1208 " plugin: %s\n", dev->transport->name); 1209 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ 1210 goto out_invalid_cdb_field; 1211 } 1212 /* 1213 * For the overflow case keep the existing fabric provided 1214 * ->data_length. Otherwise for the underflow case, reset 1215 * ->data_length to the smaller SCSI expected data transfer 1216 * length. 1217 */ 1218 if (size > cmd->data_length) { 1219 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; 1220 cmd->residual_count = (size - cmd->data_length); 1221 } else { 1222 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 1223 cmd->residual_count = (cmd->data_length - size); 1224 cmd->data_length = size; 1225 } 1226 } 1227 1228 return 0; 1229 1230 out_invalid_cdb_field: 1231 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1232 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1233 return -EINVAL; 1234 } 1235 1236 /* 1237 * Used by fabric modules containing a local struct se_cmd within their 1238 * fabric dependent per I/O descriptor. 1239 */ 1240 void transport_init_se_cmd( 1241 struct se_cmd *cmd, 1242 struct target_core_fabric_ops *tfo, 1243 struct se_session *se_sess, 1244 u32 data_length, 1245 int data_direction, 1246 int task_attr, 1247 unsigned char *sense_buffer) 1248 { 1249 INIT_LIST_HEAD(&cmd->se_lun_node); 1250 INIT_LIST_HEAD(&cmd->se_delayed_node); 1251 INIT_LIST_HEAD(&cmd->se_qf_node); 1252 INIT_LIST_HEAD(&cmd->se_cmd_list); 1253 INIT_LIST_HEAD(&cmd->state_list); 1254 init_completion(&cmd->transport_lun_fe_stop_comp); 1255 init_completion(&cmd->transport_lun_stop_comp); 1256 init_completion(&cmd->t_transport_stop_comp); 1257 init_completion(&cmd->cmd_wait_comp); 1258 init_completion(&cmd->task_stop_comp); 1259 spin_lock_init(&cmd->t_state_lock); 1260 cmd->transport_state = CMD_T_DEV_ACTIVE; 1261 1262 cmd->se_tfo = tfo; 1263 cmd->se_sess = se_sess; 1264 cmd->data_length = data_length; 1265 cmd->data_direction = data_direction; 1266 cmd->sam_task_attr = task_attr; 1267 cmd->sense_buffer = sense_buffer; 1268 1269 cmd->state_active = false; 1270 } 1271 EXPORT_SYMBOL(transport_init_se_cmd); 1272 1273 static int transport_check_alloc_task_attr(struct se_cmd *cmd) 1274 { 1275 /* 1276 * Check if SAM Task Attribute emulation is enabled for this 1277 * struct se_device storage object 1278 */ 1279 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) 1280 return 0; 1281 1282 if (cmd->sam_task_attr == MSG_ACA_TAG) { 1283 pr_debug("SAM Task Attribute ACA" 1284 " emulation is not supported\n"); 1285 return -EINVAL; 1286 } 1287 /* 1288 * Used to determine when ORDERED commands should go from 1289 * Dormant to Active status. 1290 */ 1291 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); 1292 smp_mb__after_atomic_inc(); 1293 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", 1294 cmd->se_ordered_id, cmd->sam_task_attr, 1295 cmd->se_dev->transport->name); 1296 return 0; 1297 } 1298 1299 /* target_setup_cmd_from_cdb(): 1300 * 1301 * Called from fabric RX Thread. 1302 */ 1303 int target_setup_cmd_from_cdb( 1304 struct se_cmd *cmd, 1305 unsigned char *cdb) 1306 { 1307 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 1308 u32 pr_reg_type = 0; 1309 u8 alua_ascq = 0; 1310 unsigned long flags; 1311 int ret; 1312 1313 /* 1314 * Ensure that the received CDB is less than the max (252 + 8) bytes 1315 * for VARIABLE_LENGTH_CMD 1316 */ 1317 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { 1318 pr_err("Received SCSI CDB with command_size: %d that" 1319 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", 1320 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); 1321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1322 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1323 return -EINVAL; 1324 } 1325 /* 1326 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, 1327 * allocate the additional extended CDB buffer now.. Otherwise 1328 * setup the pointer from __t_task_cdb to t_task_cdb. 1329 */ 1330 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { 1331 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), 1332 GFP_KERNEL); 1333 if (!cmd->t_task_cdb) { 1334 pr_err("Unable to allocate cmd->t_task_cdb" 1335 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", 1336 scsi_command_size(cdb), 1337 (unsigned long)sizeof(cmd->__t_task_cdb)); 1338 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1339 cmd->scsi_sense_reason = 1340 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1341 return -ENOMEM; 1342 } 1343 } else 1344 cmd->t_task_cdb = &cmd->__t_task_cdb[0]; 1345 /* 1346 * Copy the original CDB into cmd-> 1347 */ 1348 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); 1349 1350 /* 1351 * Check for an existing UNIT ATTENTION condition 1352 */ 1353 if (core_scsi3_ua_check(cmd, cdb) < 0) { 1354 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1355 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; 1356 return -EINVAL; 1357 } 1358 1359 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); 1360 if (ret != 0) { 1361 /* 1362 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 1363 * The ALUA additional sense code qualifier (ASCQ) is determined 1364 * by the ALUA primary or secondary access state.. 1365 */ 1366 if (ret > 0) { 1367 pr_debug("[%s]: ALUA TG Port not available, " 1368 "SenseKey: NOT_READY, ASC/ASCQ: " 1369 "0x04/0x%02x\n", 1370 cmd->se_tfo->get_fabric_name(), alua_ascq); 1371 1372 transport_set_sense_codes(cmd, 0x04, alua_ascq); 1373 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1374 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; 1375 return -EINVAL; 1376 } 1377 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1378 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1379 return -EINVAL; 1380 } 1381 1382 /* 1383 * Check status for SPC-3 Persistent Reservations 1384 */ 1385 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) { 1386 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( 1387 cmd, cdb, pr_reg_type) != 0) { 1388 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1389 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; 1390 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1391 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 1392 return -EBUSY; 1393 } 1394 /* 1395 * This means the CDB is allowed for the SCSI Initiator port 1396 * when said port is *NOT* holding the legacy SPC-2 or 1397 * SPC-3 Persistent Reservation. 1398 */ 1399 } 1400 1401 ret = cmd->se_dev->transport->parse_cdb(cmd); 1402 if (ret < 0) 1403 return ret; 1404 1405 spin_lock_irqsave(&cmd->t_state_lock, flags); 1406 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; 1407 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 1408 1409 /* 1410 * Check for SAM Task Attribute Emulation 1411 */ 1412 if (transport_check_alloc_task_attr(cmd) < 0) { 1413 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1414 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1415 return -EINVAL; 1416 } 1417 spin_lock(&cmd->se_lun->lun_sep_lock); 1418 if (cmd->se_lun->lun_sep) 1419 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; 1420 spin_unlock(&cmd->se_lun->lun_sep_lock); 1421 return 0; 1422 } 1423 EXPORT_SYMBOL(target_setup_cmd_from_cdb); 1424 1425 /* 1426 * Used by fabric module frontends to queue tasks directly. 1427 * Many only be used from process context only 1428 */ 1429 int transport_handle_cdb_direct( 1430 struct se_cmd *cmd) 1431 { 1432 int ret; 1433 1434 if (!cmd->se_lun) { 1435 dump_stack(); 1436 pr_err("cmd->se_lun is NULL\n"); 1437 return -EINVAL; 1438 } 1439 if (in_interrupt()) { 1440 dump_stack(); 1441 pr_err("transport_generic_handle_cdb cannot be called" 1442 " from interrupt context\n"); 1443 return -EINVAL; 1444 } 1445 /* 1446 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that 1447 * outstanding descriptors are handled correctly during shutdown via 1448 * transport_wait_for_tasks() 1449 * 1450 * Also, we don't take cmd->t_state_lock here as we only expect 1451 * this to be called for initial descriptor submission. 1452 */ 1453 cmd->t_state = TRANSPORT_NEW_CMD; 1454 cmd->transport_state |= CMD_T_ACTIVE; 1455 1456 /* 1457 * transport_generic_new_cmd() is already handling QUEUE_FULL, 1458 * so follow TRANSPORT_NEW_CMD processing thread context usage 1459 * and call transport_generic_request_failure() if necessary.. 1460 */ 1461 ret = transport_generic_new_cmd(cmd); 1462 if (ret < 0) 1463 transport_generic_request_failure(cmd); 1464 1465 return 0; 1466 } 1467 EXPORT_SYMBOL(transport_handle_cdb_direct); 1468 1469 /** 1470 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd 1471 * 1472 * @se_cmd: command descriptor to submit 1473 * @se_sess: associated se_sess for endpoint 1474 * @cdb: pointer to SCSI CDB 1475 * @sense: pointer to SCSI sense buffer 1476 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1477 * @data_length: fabric expected data transfer length 1478 * @task_addr: SAM task attribute 1479 * @data_dir: DMA data direction 1480 * @flags: flags for command submission from target_sc_flags_tables 1481 * 1482 * Returns non zero to signal active I/O shutdown failure. All other 1483 * setup exceptions will be returned as a SCSI CHECK_CONDITION response, 1484 * but still return zero here. 1485 * 1486 * This may only be called from process context, and also currently 1487 * assumes internal allocation of fabric payload buffer by target-core. 1488 **/ 1489 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, 1490 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, 1491 u32 data_length, int task_attr, int data_dir, int flags) 1492 { 1493 struct se_portal_group *se_tpg; 1494 int rc; 1495 1496 se_tpg = se_sess->se_tpg; 1497 BUG_ON(!se_tpg); 1498 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); 1499 BUG_ON(in_interrupt()); 1500 /* 1501 * Initialize se_cmd for target operation. From this point 1502 * exceptions are handled by sending exception status via 1503 * target_core_fabric_ops->queue_status() callback 1504 */ 1505 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1506 data_length, data_dir, task_attr, sense); 1507 if (flags & TARGET_SCF_UNKNOWN_SIZE) 1508 se_cmd->unknown_data_length = 1; 1509 /* 1510 * Obtain struct se_cmd->cmd_kref reference and add new cmd to 1511 * se_sess->sess_cmd_list. A second kref_get here is necessary 1512 * for fabrics using TARGET_SCF_ACK_KREF that expect a second 1513 * kref_put() to happen during fabric packet acknowledgement. 1514 */ 1515 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1516 if (rc) 1517 return rc; 1518 /* 1519 * Signal bidirectional data payloads to target-core 1520 */ 1521 if (flags & TARGET_SCF_BIDI_OP) 1522 se_cmd->se_cmd_flags |= SCF_BIDI; 1523 /* 1524 * Locate se_lun pointer and attach it to struct se_cmd 1525 */ 1526 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { 1527 transport_send_check_condition_and_sense(se_cmd, 1528 se_cmd->scsi_sense_reason, 0); 1529 target_put_sess_cmd(se_sess, se_cmd); 1530 return 0; 1531 } 1532 1533 rc = target_setup_cmd_from_cdb(se_cmd, cdb); 1534 if (rc != 0) { 1535 transport_generic_request_failure(se_cmd); 1536 return 0; 1537 } 1538 1539 /* 1540 * Check if we need to delay processing because of ALUA 1541 * Active/NonOptimized primary access state.. 1542 */ 1543 core_alua_check_nonop_delay(se_cmd); 1544 1545 transport_handle_cdb_direct(se_cmd); 1546 return 0; 1547 } 1548 EXPORT_SYMBOL(target_submit_cmd); 1549 1550 static void target_complete_tmr_failure(struct work_struct *work) 1551 { 1552 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); 1553 1554 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; 1555 se_cmd->se_tfo->queue_tm_rsp(se_cmd); 1556 transport_generic_free_cmd(se_cmd, 0); 1557 } 1558 1559 /** 1560 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd 1561 * for TMR CDBs 1562 * 1563 * @se_cmd: command descriptor to submit 1564 * @se_sess: associated se_sess for endpoint 1565 * @sense: pointer to SCSI sense buffer 1566 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1567 * @fabric_context: fabric context for TMR req 1568 * @tm_type: Type of TM request 1569 * @gfp: gfp type for caller 1570 * @tag: referenced task tag for TMR_ABORT_TASK 1571 * @flags: submit cmd flags 1572 * 1573 * Callable from all contexts. 1574 **/ 1575 1576 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, 1577 unsigned char *sense, u32 unpacked_lun, 1578 void *fabric_tmr_ptr, unsigned char tm_type, 1579 gfp_t gfp, unsigned int tag, int flags) 1580 { 1581 struct se_portal_group *se_tpg; 1582 int ret; 1583 1584 se_tpg = se_sess->se_tpg; 1585 BUG_ON(!se_tpg); 1586 1587 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1588 0, DMA_NONE, MSG_SIMPLE_TAG, sense); 1589 /* 1590 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req 1591 * allocation failure. 1592 */ 1593 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); 1594 if (ret < 0) 1595 return -ENOMEM; 1596 1597 if (tm_type == TMR_ABORT_TASK) 1598 se_cmd->se_tmr_req->ref_task_tag = tag; 1599 1600 /* See target_submit_cmd for commentary */ 1601 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1602 if (ret) { 1603 core_tmr_release_req(se_cmd->se_tmr_req); 1604 return ret; 1605 } 1606 1607 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); 1608 if (ret) { 1609 /* 1610 * For callback during failure handling, push this work off 1611 * to process context with TMR_LUN_DOES_NOT_EXIST status. 1612 */ 1613 INIT_WORK(&se_cmd->work, target_complete_tmr_failure); 1614 schedule_work(&se_cmd->work); 1615 return 0; 1616 } 1617 transport_generic_handle_tmr(se_cmd); 1618 return 0; 1619 } 1620 EXPORT_SYMBOL(target_submit_tmr); 1621 1622 /* 1623 * If the cmd is active, request it to be stopped and sleep until it 1624 * has completed. 1625 */ 1626 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) 1627 { 1628 bool was_active = false; 1629 1630 if (cmd->transport_state & CMD_T_BUSY) { 1631 cmd->transport_state |= CMD_T_REQUEST_STOP; 1632 spin_unlock_irqrestore(&cmd->t_state_lock, *flags); 1633 1634 pr_debug("cmd %p waiting to complete\n", cmd); 1635 wait_for_completion(&cmd->task_stop_comp); 1636 pr_debug("cmd %p stopped successfully\n", cmd); 1637 1638 spin_lock_irqsave(&cmd->t_state_lock, *flags); 1639 cmd->transport_state &= ~CMD_T_REQUEST_STOP; 1640 cmd->transport_state &= ~CMD_T_BUSY; 1641 was_active = true; 1642 } 1643 1644 return was_active; 1645 } 1646 1647 /* 1648 * Handle SAM-esque emulation for generic transport request failures. 1649 */ 1650 void transport_generic_request_failure(struct se_cmd *cmd) 1651 { 1652 int ret = 0; 1653 1654 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" 1655 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), 1656 cmd->t_task_cdb[0]); 1657 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", 1658 cmd->se_tfo->get_cmd_state(cmd), 1659 cmd->t_state, cmd->scsi_sense_reason); 1660 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", 1661 (cmd->transport_state & CMD_T_ACTIVE) != 0, 1662 (cmd->transport_state & CMD_T_STOP) != 0, 1663 (cmd->transport_state & CMD_T_SENT) != 0); 1664 1665 /* 1666 * For SAM Task Attribute emulation for failed struct se_cmd 1667 */ 1668 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1669 transport_complete_task_attr(cmd); 1670 1671 switch (cmd->scsi_sense_reason) { 1672 case TCM_NON_EXISTENT_LUN: 1673 case TCM_UNSUPPORTED_SCSI_OPCODE: 1674 case TCM_INVALID_CDB_FIELD: 1675 case TCM_INVALID_PARAMETER_LIST: 1676 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 1677 case TCM_UNKNOWN_MODE_PAGE: 1678 case TCM_WRITE_PROTECTED: 1679 case TCM_ADDRESS_OUT_OF_RANGE: 1680 case TCM_CHECK_CONDITION_ABORT_CMD: 1681 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 1682 case TCM_CHECK_CONDITION_NOT_READY: 1683 break; 1684 case TCM_RESERVATION_CONFLICT: 1685 /* 1686 * No SENSE Data payload for this case, set SCSI Status 1687 * and queue the response to $FABRIC_MOD. 1688 * 1689 * Uses linux/include/scsi/scsi.h SAM status codes defs 1690 */ 1691 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1692 /* 1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will 1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION 1695 * CONFLICT STATUS. 1696 * 1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349 1698 */ 1699 if (cmd->se_sess && 1700 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) 1701 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, 1702 cmd->orig_fe_lun, 0x2C, 1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); 1704 1705 ret = cmd->se_tfo->queue_status(cmd); 1706 if (ret == -EAGAIN || ret == -ENOMEM) 1707 goto queue_full; 1708 goto check_stop; 1709 default: 1710 pr_err("Unknown transport error for CDB 0x%02x: %d\n", 1711 cmd->t_task_cdb[0], cmd->scsi_sense_reason); 1712 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1713 break; 1714 } 1715 1716 ret = transport_send_check_condition_and_sense(cmd, 1717 cmd->scsi_sense_reason, 0); 1718 if (ret == -EAGAIN || ret == -ENOMEM) 1719 goto queue_full; 1720 1721 check_stop: 1722 transport_lun_remove_cmd(cmd); 1723 if (!transport_cmd_check_stop_to_fabric(cmd)) 1724 ; 1725 return; 1726 1727 queue_full: 1728 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 1729 transport_handle_queue_full(cmd, cmd->se_dev); 1730 } 1731 EXPORT_SYMBOL(transport_generic_request_failure); 1732 1733 static void __target_execute_cmd(struct se_cmd *cmd) 1734 { 1735 int error = 0; 1736 1737 spin_lock_irq(&cmd->t_state_lock); 1738 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT); 1739 spin_unlock_irq(&cmd->t_state_lock); 1740 1741 if (cmd->execute_cmd) 1742 error = cmd->execute_cmd(cmd); 1743 1744 if (error) { 1745 spin_lock_irq(&cmd->t_state_lock); 1746 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); 1747 spin_unlock_irq(&cmd->t_state_lock); 1748 1749 transport_generic_request_failure(cmd); 1750 } 1751 } 1752 1753 void target_execute_cmd(struct se_cmd *cmd) 1754 { 1755 struct se_device *dev = cmd->se_dev; 1756 1757 /* 1758 * If the received CDB has aleady been aborted stop processing it here. 1759 */ 1760 if (transport_check_aborted_status(cmd, 1)) 1761 return; 1762 1763 /* 1764 * Determine if IOCTL context caller in requesting the stopping of this 1765 * command for LUN shutdown purposes. 1766 */ 1767 spin_lock_irq(&cmd->t_state_lock); 1768 if (cmd->transport_state & CMD_T_LUN_STOP) { 1769 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", 1770 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); 1771 1772 cmd->transport_state &= ~CMD_T_ACTIVE; 1773 spin_unlock_irq(&cmd->t_state_lock); 1774 complete(&cmd->transport_lun_stop_comp); 1775 return; 1776 } 1777 /* 1778 * Determine if frontend context caller is requesting the stopping of 1779 * this command for frontend exceptions. 1780 */ 1781 if (cmd->transport_state & CMD_T_STOP) { 1782 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", 1783 __func__, __LINE__, 1784 cmd->se_tfo->get_task_tag(cmd)); 1785 1786 spin_unlock_irq(&cmd->t_state_lock); 1787 complete(&cmd->t_transport_stop_comp); 1788 return; 1789 } 1790 1791 cmd->t_state = TRANSPORT_PROCESSING; 1792 spin_unlock_irq(&cmd->t_state_lock); 1793 1794 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) 1795 goto execute; 1796 1797 /* 1798 * Check for the existence of HEAD_OF_QUEUE, and if true return 1 1799 * to allow the passed struct se_cmd list of tasks to the front of the list. 1800 */ 1801 switch (cmd->sam_task_attr) { 1802 case MSG_HEAD_TAG: 1803 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " 1804 "se_ordered_id: %u\n", 1805 cmd->t_task_cdb[0], cmd->se_ordered_id); 1806 goto execute; 1807 case MSG_ORDERED_TAG: 1808 atomic_inc(&dev->dev_ordered_sync); 1809 smp_mb__after_atomic_inc(); 1810 1811 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " 1812 " se_ordered_id: %u\n", 1813 cmd->t_task_cdb[0], cmd->se_ordered_id); 1814 1815 /* 1816 * Execute an ORDERED command if no other older commands 1817 * exist that need to be completed first. 1818 */ 1819 if (!atomic_read(&dev->simple_cmds)) 1820 goto execute; 1821 break; 1822 default: 1823 /* 1824 * For SIMPLE and UNTAGGED Task Attribute commands 1825 */ 1826 atomic_inc(&dev->simple_cmds); 1827 smp_mb__after_atomic_inc(); 1828 break; 1829 } 1830 1831 if (atomic_read(&dev->dev_ordered_sync) != 0) { 1832 spin_lock(&dev->delayed_cmd_lock); 1833 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); 1834 spin_unlock(&dev->delayed_cmd_lock); 1835 1836 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" 1837 " delayed CMD list, se_ordered_id: %u\n", 1838 cmd->t_task_cdb[0], cmd->sam_task_attr, 1839 cmd->se_ordered_id); 1840 return; 1841 } 1842 1843 execute: 1844 /* 1845 * Otherwise, no ORDERED task attributes exist.. 1846 */ 1847 __target_execute_cmd(cmd); 1848 } 1849 EXPORT_SYMBOL(target_execute_cmd); 1850 1851 /* 1852 * Process all commands up to the last received ORDERED task attribute which 1853 * requires another blocking boundary 1854 */ 1855 static void target_restart_delayed_cmds(struct se_device *dev) 1856 { 1857 for (;;) { 1858 struct se_cmd *cmd; 1859 1860 spin_lock(&dev->delayed_cmd_lock); 1861 if (list_empty(&dev->delayed_cmd_list)) { 1862 spin_unlock(&dev->delayed_cmd_lock); 1863 break; 1864 } 1865 1866 cmd = list_entry(dev->delayed_cmd_list.next, 1867 struct se_cmd, se_delayed_node); 1868 list_del(&cmd->se_delayed_node); 1869 spin_unlock(&dev->delayed_cmd_lock); 1870 1871 __target_execute_cmd(cmd); 1872 1873 if (cmd->sam_task_attr == MSG_ORDERED_TAG) 1874 break; 1875 } 1876 } 1877 1878 /* 1879 * Called from I/O completion to determine which dormant/delayed 1880 * and ordered cmds need to have their tasks added to the execution queue. 1881 */ 1882 static void transport_complete_task_attr(struct se_cmd *cmd) 1883 { 1884 struct se_device *dev = cmd->se_dev; 1885 1886 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { 1887 atomic_dec(&dev->simple_cmds); 1888 smp_mb__after_atomic_dec(); 1889 dev->dev_cur_ordered_id++; 1890 pr_debug("Incremented dev->dev_cur_ordered_id: %u for" 1891 " SIMPLE: %u\n", dev->dev_cur_ordered_id, 1892 cmd->se_ordered_id); 1893 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { 1894 dev->dev_cur_ordered_id++; 1895 pr_debug("Incremented dev_cur_ordered_id: %u for" 1896 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, 1897 cmd->se_ordered_id); 1898 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { 1899 atomic_dec(&dev->dev_ordered_sync); 1900 smp_mb__after_atomic_dec(); 1901 1902 dev->dev_cur_ordered_id++; 1903 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" 1904 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); 1905 } 1906 1907 target_restart_delayed_cmds(dev); 1908 } 1909 1910 static void transport_complete_qf(struct se_cmd *cmd) 1911 { 1912 int ret = 0; 1913 1914 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1915 transport_complete_task_attr(cmd); 1916 1917 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 1918 ret = cmd->se_tfo->queue_status(cmd); 1919 if (ret) 1920 goto out; 1921 } 1922 1923 switch (cmd->data_direction) { 1924 case DMA_FROM_DEVICE: 1925 ret = cmd->se_tfo->queue_data_in(cmd); 1926 break; 1927 case DMA_TO_DEVICE: 1928 if (cmd->t_bidi_data_sg) { 1929 ret = cmd->se_tfo->queue_data_in(cmd); 1930 if (ret < 0) 1931 break; 1932 } 1933 /* Fall through for DMA_TO_DEVICE */ 1934 case DMA_NONE: 1935 ret = cmd->se_tfo->queue_status(cmd); 1936 break; 1937 default: 1938 break; 1939 } 1940 1941 out: 1942 if (ret < 0) { 1943 transport_handle_queue_full(cmd, cmd->se_dev); 1944 return; 1945 } 1946 transport_lun_remove_cmd(cmd); 1947 transport_cmd_check_stop_to_fabric(cmd); 1948 } 1949 1950 static void transport_handle_queue_full( 1951 struct se_cmd *cmd, 1952 struct se_device *dev) 1953 { 1954 spin_lock_irq(&dev->qf_cmd_lock); 1955 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); 1956 atomic_inc(&dev->dev_qf_count); 1957 smp_mb__after_atomic_inc(); 1958 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); 1959 1960 schedule_work(&cmd->se_dev->qf_work_queue); 1961 } 1962 1963 static void target_complete_ok_work(struct work_struct *work) 1964 { 1965 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 1966 int ret; 1967 1968 /* 1969 * Check if we need to move delayed/dormant tasks from cmds on the 1970 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task 1971 * Attribute. 1972 */ 1973 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1974 transport_complete_task_attr(cmd); 1975 /* 1976 * Check to schedule QUEUE_FULL work, or execute an existing 1977 * cmd->transport_qf_callback() 1978 */ 1979 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) 1980 schedule_work(&cmd->se_dev->qf_work_queue); 1981 1982 /* 1983 * Check if we need to send a sense buffer from 1984 * the struct se_cmd in question. 1985 */ 1986 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 1987 WARN_ON(!cmd->scsi_status); 1988 ret = transport_send_check_condition_and_sense( 1989 cmd, 0, 1); 1990 if (ret == -EAGAIN || ret == -ENOMEM) 1991 goto queue_full; 1992 1993 transport_lun_remove_cmd(cmd); 1994 transport_cmd_check_stop_to_fabric(cmd); 1995 return; 1996 } 1997 /* 1998 * Check for a callback, used by amongst other things 1999 * XDWRITE_READ_10 emulation. 2000 */ 2001 if (cmd->transport_complete_callback) 2002 cmd->transport_complete_callback(cmd); 2003 2004 switch (cmd->data_direction) { 2005 case DMA_FROM_DEVICE: 2006 spin_lock(&cmd->se_lun->lun_sep_lock); 2007 if (cmd->se_lun->lun_sep) { 2008 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2009 cmd->data_length; 2010 } 2011 spin_unlock(&cmd->se_lun->lun_sep_lock); 2012 2013 ret = cmd->se_tfo->queue_data_in(cmd); 2014 if (ret == -EAGAIN || ret == -ENOMEM) 2015 goto queue_full; 2016 break; 2017 case DMA_TO_DEVICE: 2018 spin_lock(&cmd->se_lun->lun_sep_lock); 2019 if (cmd->se_lun->lun_sep) { 2020 cmd->se_lun->lun_sep->sep_stats.rx_data_octets += 2021 cmd->data_length; 2022 } 2023 spin_unlock(&cmd->se_lun->lun_sep_lock); 2024 /* 2025 * Check if we need to send READ payload for BIDI-COMMAND 2026 */ 2027 if (cmd->t_bidi_data_sg) { 2028 spin_lock(&cmd->se_lun->lun_sep_lock); 2029 if (cmd->se_lun->lun_sep) { 2030 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2031 cmd->data_length; 2032 } 2033 spin_unlock(&cmd->se_lun->lun_sep_lock); 2034 ret = cmd->se_tfo->queue_data_in(cmd); 2035 if (ret == -EAGAIN || ret == -ENOMEM) 2036 goto queue_full; 2037 break; 2038 } 2039 /* Fall through for DMA_TO_DEVICE */ 2040 case DMA_NONE: 2041 ret = cmd->se_tfo->queue_status(cmd); 2042 if (ret == -EAGAIN || ret == -ENOMEM) 2043 goto queue_full; 2044 break; 2045 default: 2046 break; 2047 } 2048 2049 transport_lun_remove_cmd(cmd); 2050 transport_cmd_check_stop_to_fabric(cmd); 2051 return; 2052 2053 queue_full: 2054 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," 2055 " data_direction: %d\n", cmd, cmd->data_direction); 2056 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 2057 transport_handle_queue_full(cmd, cmd->se_dev); 2058 } 2059 2060 static inline void transport_free_sgl(struct scatterlist *sgl, int nents) 2061 { 2062 struct scatterlist *sg; 2063 int count; 2064 2065 for_each_sg(sgl, sg, nents, count) 2066 __free_page(sg_page(sg)); 2067 2068 kfree(sgl); 2069 } 2070 2071 static inline void transport_free_pages(struct se_cmd *cmd) 2072 { 2073 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) 2074 return; 2075 2076 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); 2077 cmd->t_data_sg = NULL; 2078 cmd->t_data_nents = 0; 2079 2080 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); 2081 cmd->t_bidi_data_sg = NULL; 2082 cmd->t_bidi_data_nents = 0; 2083 } 2084 2085 /** 2086 * transport_release_cmd - free a command 2087 * @cmd: command to free 2088 * 2089 * This routine unconditionally frees a command, and reference counting 2090 * or list removal must be done in the caller. 2091 */ 2092 static void transport_release_cmd(struct se_cmd *cmd) 2093 { 2094 BUG_ON(!cmd->se_tfo); 2095 2096 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 2097 core_tmr_release_req(cmd->se_tmr_req); 2098 if (cmd->t_task_cdb != cmd->__t_task_cdb) 2099 kfree(cmd->t_task_cdb); 2100 /* 2101 * If this cmd has been setup with target_get_sess_cmd(), drop 2102 * the kref and call ->release_cmd() in kref callback. 2103 */ 2104 if (cmd->check_release != 0) { 2105 target_put_sess_cmd(cmd->se_sess, cmd); 2106 return; 2107 } 2108 cmd->se_tfo->release_cmd(cmd); 2109 } 2110 2111 /** 2112 * transport_put_cmd - release a reference to a command 2113 * @cmd: command to release 2114 * 2115 * This routine releases our reference to the command and frees it if possible. 2116 */ 2117 static void transport_put_cmd(struct se_cmd *cmd) 2118 { 2119 unsigned long flags; 2120 2121 spin_lock_irqsave(&cmd->t_state_lock, flags); 2122 if (atomic_read(&cmd->t_fe_count)) { 2123 if (!atomic_dec_and_test(&cmd->t_fe_count)) 2124 goto out_busy; 2125 } 2126 2127 if (cmd->transport_state & CMD_T_DEV_ACTIVE) { 2128 cmd->transport_state &= ~CMD_T_DEV_ACTIVE; 2129 target_remove_from_state_list(cmd); 2130 } 2131 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2132 2133 transport_free_pages(cmd); 2134 transport_release_cmd(cmd); 2135 return; 2136 out_busy: 2137 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2138 } 2139 2140 /* 2141 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of 2142 * allocating in the core. 2143 * @cmd: Associated se_cmd descriptor 2144 * @mem: SGL style memory for TCM WRITE / READ 2145 * @sg_mem_num: Number of SGL elements 2146 * @mem_bidi_in: SGL style memory for TCM BIDI READ 2147 * @sg_mem_bidi_num: Number of BIDI READ SGL elements 2148 * 2149 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage 2150 * of parameters. 2151 */ 2152 int transport_generic_map_mem_to_cmd( 2153 struct se_cmd *cmd, 2154 struct scatterlist *sgl, 2155 u32 sgl_count, 2156 struct scatterlist *sgl_bidi, 2157 u32 sgl_bidi_count) 2158 { 2159 if (!sgl || !sgl_count) 2160 return 0; 2161 2162 /* 2163 * Reject SCSI data overflow with map_mem_to_cmd() as incoming 2164 * scatterlists already have been set to follow what the fabric 2165 * passes for the original expected data transfer length. 2166 */ 2167 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { 2168 pr_warn("Rejecting SCSI DATA overflow for fabric using" 2169 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); 2170 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 2171 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2172 return -EINVAL; 2173 } 2174 2175 cmd->t_data_sg = sgl; 2176 cmd->t_data_nents = sgl_count; 2177 2178 if (sgl_bidi && sgl_bidi_count) { 2179 cmd->t_bidi_data_sg = sgl_bidi; 2180 cmd->t_bidi_data_nents = sgl_bidi_count; 2181 } 2182 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 2183 return 0; 2184 } 2185 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); 2186 2187 void *transport_kmap_data_sg(struct se_cmd *cmd) 2188 { 2189 struct scatterlist *sg = cmd->t_data_sg; 2190 struct page **pages; 2191 int i; 2192 2193 /* 2194 * We need to take into account a possible offset here for fabrics like 2195 * tcm_loop who may be using a contig buffer from the SCSI midlayer for 2196 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() 2197 */ 2198 if (!cmd->t_data_nents) 2199 return NULL; 2200 2201 BUG_ON(!sg); 2202 if (cmd->t_data_nents == 1) 2203 return kmap(sg_page(sg)) + sg->offset; 2204 2205 /* >1 page. use vmap */ 2206 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); 2207 if (!pages) { 2208 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2209 return NULL; 2210 } 2211 2212 /* convert sg[] to pages[] */ 2213 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { 2214 pages[i] = sg_page(sg); 2215 } 2216 2217 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); 2218 kfree(pages); 2219 if (!cmd->t_data_vmap) { 2220 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2221 return NULL; 2222 } 2223 2224 return cmd->t_data_vmap + cmd->t_data_sg[0].offset; 2225 } 2226 EXPORT_SYMBOL(transport_kmap_data_sg); 2227 2228 void transport_kunmap_data_sg(struct se_cmd *cmd) 2229 { 2230 if (!cmd->t_data_nents) { 2231 return; 2232 } else if (cmd->t_data_nents == 1) { 2233 kunmap(sg_page(cmd->t_data_sg)); 2234 return; 2235 } 2236 2237 vunmap(cmd->t_data_vmap); 2238 cmd->t_data_vmap = NULL; 2239 } 2240 EXPORT_SYMBOL(transport_kunmap_data_sg); 2241 2242 static int 2243 transport_generic_get_mem(struct se_cmd *cmd) 2244 { 2245 u32 length = cmd->data_length; 2246 unsigned int nents; 2247 struct page *page; 2248 gfp_t zero_flag; 2249 int i = 0; 2250 2251 nents = DIV_ROUND_UP(length, PAGE_SIZE); 2252 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); 2253 if (!cmd->t_data_sg) 2254 return -ENOMEM; 2255 2256 cmd->t_data_nents = nents; 2257 sg_init_table(cmd->t_data_sg, nents); 2258 2259 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO; 2260 2261 while (length) { 2262 u32 page_len = min_t(u32, length, PAGE_SIZE); 2263 page = alloc_page(GFP_KERNEL | zero_flag); 2264 if (!page) 2265 goto out; 2266 2267 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); 2268 length -= page_len; 2269 i++; 2270 } 2271 return 0; 2272 2273 out: 2274 while (i > 0) { 2275 i--; 2276 __free_page(sg_page(&cmd->t_data_sg[i])); 2277 } 2278 kfree(cmd->t_data_sg); 2279 cmd->t_data_sg = NULL; 2280 return -ENOMEM; 2281 } 2282 2283 /* 2284 * Allocate any required resources to execute the command. For writes we 2285 * might not have the payload yet, so notify the fabric via a call to 2286 * ->write_pending instead. Otherwise place it on the execution queue. 2287 */ 2288 int transport_generic_new_cmd(struct se_cmd *cmd) 2289 { 2290 int ret = 0; 2291 2292 /* 2293 * Determine is the TCM fabric module has already allocated physical 2294 * memory, and is directly calling transport_generic_map_mem_to_cmd() 2295 * beforehand. 2296 */ 2297 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && 2298 cmd->data_length) { 2299 ret = transport_generic_get_mem(cmd); 2300 if (ret < 0) 2301 goto out_fail; 2302 } 2303 /* 2304 * If this command doesn't have any payload and we don't have to call 2305 * into the fabric for data transfers, go ahead and complete it right 2306 * away. 2307 */ 2308 if (!cmd->data_length && 2309 cmd->t_task_cdb[0] != REQUEST_SENSE && 2310 cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { 2311 spin_lock_irq(&cmd->t_state_lock); 2312 cmd->t_state = TRANSPORT_COMPLETE; 2313 cmd->transport_state |= CMD_T_ACTIVE; 2314 spin_unlock_irq(&cmd->t_state_lock); 2315 2316 INIT_WORK(&cmd->work, target_complete_ok_work); 2317 queue_work(target_completion_wq, &cmd->work); 2318 return 0; 2319 } 2320 2321 atomic_inc(&cmd->t_fe_count); 2322 2323 /* 2324 * If this command is not a write we can execute it right here, 2325 * for write buffers we need to notify the fabric driver first 2326 * and let it call back once the write buffers are ready. 2327 */ 2328 target_add_to_state_list(cmd); 2329 if (cmd->data_direction != DMA_TO_DEVICE) { 2330 target_execute_cmd(cmd); 2331 return 0; 2332 } 2333 2334 spin_lock_irq(&cmd->t_state_lock); 2335 cmd->t_state = TRANSPORT_WRITE_PENDING; 2336 spin_unlock_irq(&cmd->t_state_lock); 2337 2338 transport_cmd_check_stop(cmd, false); 2339 2340 ret = cmd->se_tfo->write_pending(cmd); 2341 if (ret == -EAGAIN || ret == -ENOMEM) 2342 goto queue_full; 2343 2344 if (ret < 0) 2345 return ret; 2346 return 1; 2347 2348 out_fail: 2349 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 2350 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2351 return -EINVAL; 2352 queue_full: 2353 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); 2354 cmd->t_state = TRANSPORT_COMPLETE_QF_WP; 2355 transport_handle_queue_full(cmd, cmd->se_dev); 2356 return 0; 2357 } 2358 EXPORT_SYMBOL(transport_generic_new_cmd); 2359 2360 static void transport_write_pending_qf(struct se_cmd *cmd) 2361 { 2362 int ret; 2363 2364 ret = cmd->se_tfo->write_pending(cmd); 2365 if (ret == -EAGAIN || ret == -ENOMEM) { 2366 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", 2367 cmd); 2368 transport_handle_queue_full(cmd, cmd->se_dev); 2369 } 2370 } 2371 2372 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) 2373 { 2374 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { 2375 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 2376 transport_wait_for_tasks(cmd); 2377 2378 transport_release_cmd(cmd); 2379 } else { 2380 if (wait_for_tasks) 2381 transport_wait_for_tasks(cmd); 2382 2383 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); 2384 2385 if (cmd->se_lun) 2386 transport_lun_remove_cmd(cmd); 2387 2388 transport_put_cmd(cmd); 2389 } 2390 } 2391 EXPORT_SYMBOL(transport_generic_free_cmd); 2392 2393 /* target_get_sess_cmd - Add command to active ->sess_cmd_list 2394 * @se_sess: session to reference 2395 * @se_cmd: command descriptor to add 2396 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() 2397 */ 2398 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, 2399 bool ack_kref) 2400 { 2401 unsigned long flags; 2402 int ret = 0; 2403 2404 kref_init(&se_cmd->cmd_kref); 2405 /* 2406 * Add a second kref if the fabric caller is expecting to handle 2407 * fabric acknowledgement that requires two target_put_sess_cmd() 2408 * invocations before se_cmd descriptor release. 2409 */ 2410 if (ack_kref == true) { 2411 kref_get(&se_cmd->cmd_kref); 2412 se_cmd->se_cmd_flags |= SCF_ACK_KREF; 2413 } 2414 2415 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2416 if (se_sess->sess_tearing_down) { 2417 ret = -ESHUTDOWN; 2418 goto out; 2419 } 2420 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); 2421 se_cmd->check_release = 1; 2422 2423 out: 2424 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2425 return ret; 2426 } 2427 2428 static void target_release_cmd_kref(struct kref *kref) 2429 { 2430 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); 2431 struct se_session *se_sess = se_cmd->se_sess; 2432 unsigned long flags; 2433 2434 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2435 if (list_empty(&se_cmd->se_cmd_list)) { 2436 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2437 se_cmd->se_tfo->release_cmd(se_cmd); 2438 return; 2439 } 2440 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { 2441 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2442 complete(&se_cmd->cmd_wait_comp); 2443 return; 2444 } 2445 list_del(&se_cmd->se_cmd_list); 2446 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2447 2448 se_cmd->se_tfo->release_cmd(se_cmd); 2449 } 2450 2451 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put 2452 * @se_sess: session to reference 2453 * @se_cmd: command descriptor to drop 2454 */ 2455 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) 2456 { 2457 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); 2458 } 2459 EXPORT_SYMBOL(target_put_sess_cmd); 2460 2461 /* target_sess_cmd_list_set_waiting - Flag all commands in 2462 * sess_cmd_list to complete cmd_wait_comp. Set 2463 * sess_tearing_down so no more commands are queued. 2464 * @se_sess: session to flag 2465 */ 2466 void target_sess_cmd_list_set_waiting(struct se_session *se_sess) 2467 { 2468 struct se_cmd *se_cmd; 2469 unsigned long flags; 2470 2471 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2472 2473 WARN_ON(se_sess->sess_tearing_down); 2474 se_sess->sess_tearing_down = 1; 2475 2476 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) 2477 se_cmd->cmd_wait_set = 1; 2478 2479 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2480 } 2481 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); 2482 2483 /* target_wait_for_sess_cmds - Wait for outstanding descriptors 2484 * @se_sess: session to wait for active I/O 2485 * @wait_for_tasks: Make extra transport_wait_for_tasks call 2486 */ 2487 void target_wait_for_sess_cmds( 2488 struct se_session *se_sess, 2489 int wait_for_tasks) 2490 { 2491 struct se_cmd *se_cmd, *tmp_cmd; 2492 bool rc = false; 2493 2494 list_for_each_entry_safe(se_cmd, tmp_cmd, 2495 &se_sess->sess_cmd_list, se_cmd_list) { 2496 list_del(&se_cmd->se_cmd_list); 2497 2498 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" 2499 " %d\n", se_cmd, se_cmd->t_state, 2500 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2501 2502 if (wait_for_tasks) { 2503 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," 2504 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2505 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2506 2507 rc = transport_wait_for_tasks(se_cmd); 2508 2509 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," 2510 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2511 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2512 } 2513 2514 if (!rc) { 2515 wait_for_completion(&se_cmd->cmd_wait_comp); 2516 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" 2517 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2518 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2519 } 2520 2521 se_cmd->se_tfo->release_cmd(se_cmd); 2522 } 2523 } 2524 EXPORT_SYMBOL(target_wait_for_sess_cmds); 2525 2526 /* transport_lun_wait_for_tasks(): 2527 * 2528 * Called from ConfigFS context to stop the passed struct se_cmd to allow 2529 * an struct se_lun to be successfully shutdown. 2530 */ 2531 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) 2532 { 2533 unsigned long flags; 2534 int ret = 0; 2535 2536 /* 2537 * If the frontend has already requested this struct se_cmd to 2538 * be stopped, we can safely ignore this struct se_cmd. 2539 */ 2540 spin_lock_irqsave(&cmd->t_state_lock, flags); 2541 if (cmd->transport_state & CMD_T_STOP) { 2542 cmd->transport_state &= ~CMD_T_LUN_STOP; 2543 2544 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", 2545 cmd->se_tfo->get_task_tag(cmd)); 2546 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2547 transport_cmd_check_stop(cmd, false); 2548 return -EPERM; 2549 } 2550 cmd->transport_state |= CMD_T_LUN_FE_STOP; 2551 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2552 2553 // XXX: audit task_flags checks. 2554 spin_lock_irqsave(&cmd->t_state_lock, flags); 2555 if ((cmd->transport_state & CMD_T_BUSY) && 2556 (cmd->transport_state & CMD_T_SENT)) { 2557 if (!target_stop_cmd(cmd, &flags)) 2558 ret++; 2559 } 2560 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2561 2562 pr_debug("ConfigFS: cmd: %p stop tasks ret:" 2563 " %d\n", cmd, ret); 2564 if (!ret) { 2565 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", 2566 cmd->se_tfo->get_task_tag(cmd)); 2567 wait_for_completion(&cmd->transport_lun_stop_comp); 2568 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", 2569 cmd->se_tfo->get_task_tag(cmd)); 2570 } 2571 2572 return 0; 2573 } 2574 2575 static void __transport_clear_lun_from_sessions(struct se_lun *lun) 2576 { 2577 struct se_cmd *cmd = NULL; 2578 unsigned long lun_flags, cmd_flags; 2579 /* 2580 * Do exception processing and return CHECK_CONDITION status to the 2581 * Initiator Port. 2582 */ 2583 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2584 while (!list_empty(&lun->lun_cmd_list)) { 2585 cmd = list_first_entry(&lun->lun_cmd_list, 2586 struct se_cmd, se_lun_node); 2587 list_del_init(&cmd->se_lun_node); 2588 2589 spin_lock(&cmd->t_state_lock); 2590 pr_debug("SE_LUN[%d] - Setting cmd->transport" 2591 "_lun_stop for ITT: 0x%08x\n", 2592 cmd->se_lun->unpacked_lun, 2593 cmd->se_tfo->get_task_tag(cmd)); 2594 cmd->transport_state |= CMD_T_LUN_STOP; 2595 spin_unlock(&cmd->t_state_lock); 2596 2597 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); 2598 2599 if (!cmd->se_lun) { 2600 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", 2601 cmd->se_tfo->get_task_tag(cmd), 2602 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); 2603 BUG(); 2604 } 2605 /* 2606 * If the Storage engine still owns the iscsi_cmd_t, determine 2607 * and/or stop its context. 2608 */ 2609 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" 2610 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, 2611 cmd->se_tfo->get_task_tag(cmd)); 2612 2613 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { 2614 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2615 continue; 2616 } 2617 2618 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" 2619 "_wait_for_tasks(): SUCCESS\n", 2620 cmd->se_lun->unpacked_lun, 2621 cmd->se_tfo->get_task_tag(cmd)); 2622 2623 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); 2624 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { 2625 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2626 goto check_cond; 2627 } 2628 cmd->transport_state &= ~CMD_T_DEV_ACTIVE; 2629 target_remove_from_state_list(cmd); 2630 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2631 2632 /* 2633 * The Storage engine stopped this struct se_cmd before it was 2634 * send to the fabric frontend for delivery back to the 2635 * Initiator Node. Return this SCSI CDB back with an 2636 * CHECK_CONDITION status. 2637 */ 2638 check_cond: 2639 transport_send_check_condition_and_sense(cmd, 2640 TCM_NON_EXISTENT_LUN, 0); 2641 /* 2642 * If the fabric frontend is waiting for this iscsi_cmd_t to 2643 * be released, notify the waiting thread now that LU has 2644 * finished accessing it. 2645 */ 2646 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); 2647 if (cmd->transport_state & CMD_T_LUN_FE_STOP) { 2648 pr_debug("SE_LUN[%d] - Detected FE stop for" 2649 " struct se_cmd: %p ITT: 0x%08x\n", 2650 lun->unpacked_lun, 2651 cmd, cmd->se_tfo->get_task_tag(cmd)); 2652 2653 spin_unlock_irqrestore(&cmd->t_state_lock, 2654 cmd_flags); 2655 transport_cmd_check_stop(cmd, false); 2656 complete(&cmd->transport_lun_fe_stop_comp); 2657 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2658 continue; 2659 } 2660 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", 2661 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); 2662 2663 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2664 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2665 } 2666 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); 2667 } 2668 2669 static int transport_clear_lun_thread(void *p) 2670 { 2671 struct se_lun *lun = p; 2672 2673 __transport_clear_lun_from_sessions(lun); 2674 complete(&lun->lun_shutdown_comp); 2675 2676 return 0; 2677 } 2678 2679 int transport_clear_lun_from_sessions(struct se_lun *lun) 2680 { 2681 struct task_struct *kt; 2682 2683 kt = kthread_run(transport_clear_lun_thread, lun, 2684 "tcm_cl_%u", lun->unpacked_lun); 2685 if (IS_ERR(kt)) { 2686 pr_err("Unable to start clear_lun thread\n"); 2687 return PTR_ERR(kt); 2688 } 2689 wait_for_completion(&lun->lun_shutdown_comp); 2690 2691 return 0; 2692 } 2693 2694 /** 2695 * transport_wait_for_tasks - wait for completion to occur 2696 * @cmd: command to wait 2697 * 2698 * Called from frontend fabric context to wait for storage engine 2699 * to pause and/or release frontend generated struct se_cmd. 2700 */ 2701 bool transport_wait_for_tasks(struct se_cmd *cmd) 2702 { 2703 unsigned long flags; 2704 2705 spin_lock_irqsave(&cmd->t_state_lock, flags); 2706 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && 2707 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2708 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2709 return false; 2710 } 2711 2712 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && 2713 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2714 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2715 return false; 2716 } 2717 /* 2718 * If we are already stopped due to an external event (ie: LUN shutdown) 2719 * sleep until the connection can have the passed struct se_cmd back. 2720 * The cmd->transport_lun_stopped_sem will be upped by 2721 * transport_clear_lun_from_sessions() once the ConfigFS context caller 2722 * has completed its operation on the struct se_cmd. 2723 */ 2724 if (cmd->transport_state & CMD_T_LUN_STOP) { 2725 pr_debug("wait_for_tasks: Stopping" 2726 " wait_for_completion(&cmd->t_tasktransport_lun_fe" 2727 "_stop_comp); for ITT: 0x%08x\n", 2728 cmd->se_tfo->get_task_tag(cmd)); 2729 /* 2730 * There is a special case for WRITES where a FE exception + 2731 * LUN shutdown means ConfigFS context is still sleeping on 2732 * transport_lun_stop_comp in transport_lun_wait_for_tasks(). 2733 * We go ahead and up transport_lun_stop_comp just to be sure 2734 * here. 2735 */ 2736 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2737 complete(&cmd->transport_lun_stop_comp); 2738 wait_for_completion(&cmd->transport_lun_fe_stop_comp); 2739 spin_lock_irqsave(&cmd->t_state_lock, flags); 2740 2741 target_remove_from_state_list(cmd); 2742 /* 2743 * At this point, the frontend who was the originator of this 2744 * struct se_cmd, now owns the structure and can be released through 2745 * normal means below. 2746 */ 2747 pr_debug("wait_for_tasks: Stopped" 2748 " wait_for_completion(&cmd->t_tasktransport_lun_fe_" 2749 "stop_comp); for ITT: 0x%08x\n", 2750 cmd->se_tfo->get_task_tag(cmd)); 2751 2752 cmd->transport_state &= ~CMD_T_LUN_STOP; 2753 } 2754 2755 if (!(cmd->transport_state & CMD_T_ACTIVE)) { 2756 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2757 return false; 2758 } 2759 2760 cmd->transport_state |= CMD_T_STOP; 2761 2762 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" 2763 " i_state: %d, t_state: %d, CMD_T_STOP\n", 2764 cmd, cmd->se_tfo->get_task_tag(cmd), 2765 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); 2766 2767 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2768 2769 wait_for_completion(&cmd->t_transport_stop_comp); 2770 2771 spin_lock_irqsave(&cmd->t_state_lock, flags); 2772 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); 2773 2774 pr_debug("wait_for_tasks: Stopped wait_for_compltion(" 2775 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", 2776 cmd->se_tfo->get_task_tag(cmd)); 2777 2778 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2779 2780 return true; 2781 } 2782 EXPORT_SYMBOL(transport_wait_for_tasks); 2783 2784 static int transport_get_sense_codes( 2785 struct se_cmd *cmd, 2786 u8 *asc, 2787 u8 *ascq) 2788 { 2789 *asc = cmd->scsi_asc; 2790 *ascq = cmd->scsi_ascq; 2791 2792 return 0; 2793 } 2794 2795 static int transport_set_sense_codes( 2796 struct se_cmd *cmd, 2797 u8 asc, 2798 u8 ascq) 2799 { 2800 cmd->scsi_asc = asc; 2801 cmd->scsi_ascq = ascq; 2802 2803 return 0; 2804 } 2805 2806 int transport_send_check_condition_and_sense( 2807 struct se_cmd *cmd, 2808 u8 reason, 2809 int from_transport) 2810 { 2811 unsigned char *buffer = cmd->sense_buffer; 2812 unsigned long flags; 2813 int offset; 2814 u8 asc = 0, ascq = 0; 2815 2816 spin_lock_irqsave(&cmd->t_state_lock, flags); 2817 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 2818 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2819 return 0; 2820 } 2821 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; 2822 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2823 2824 if (!reason && from_transport) 2825 goto after_reason; 2826 2827 if (!from_transport) 2828 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; 2829 /* 2830 * Data Segment and SenseLength of the fabric response PDU. 2831 * 2832 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE 2833 * from include/scsi/scsi_cmnd.h 2834 */ 2835 offset = cmd->se_tfo->set_fabric_sense_len(cmd, 2836 TRANSPORT_SENSE_BUFFER); 2837 /* 2838 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses 2839 * SENSE KEY values from include/scsi/scsi.h 2840 */ 2841 switch (reason) { 2842 case TCM_NON_EXISTENT_LUN: 2843 /* CURRENT ERROR */ 2844 buffer[offset] = 0x70; 2845 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2846 /* ILLEGAL REQUEST */ 2847 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2848 /* LOGICAL UNIT NOT SUPPORTED */ 2849 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; 2850 break; 2851 case TCM_UNSUPPORTED_SCSI_OPCODE: 2852 case TCM_SECTOR_COUNT_TOO_MANY: 2853 /* CURRENT ERROR */ 2854 buffer[offset] = 0x70; 2855 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2856 /* ILLEGAL REQUEST */ 2857 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2858 /* INVALID COMMAND OPERATION CODE */ 2859 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; 2860 break; 2861 case TCM_UNKNOWN_MODE_PAGE: 2862 /* CURRENT ERROR */ 2863 buffer[offset] = 0x70; 2864 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2865 /* ILLEGAL REQUEST */ 2866 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2867 /* INVALID FIELD IN CDB */ 2868 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; 2869 break; 2870 case TCM_CHECK_CONDITION_ABORT_CMD: 2871 /* CURRENT ERROR */ 2872 buffer[offset] = 0x70; 2873 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2874 /* ABORTED COMMAND */ 2875 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2876 /* BUS DEVICE RESET FUNCTION OCCURRED */ 2877 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; 2878 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; 2879 break; 2880 case TCM_INCORRECT_AMOUNT_OF_DATA: 2881 /* CURRENT ERROR */ 2882 buffer[offset] = 0x70; 2883 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2884 /* ABORTED COMMAND */ 2885 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2886 /* WRITE ERROR */ 2887 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; 2888 /* NOT ENOUGH UNSOLICITED DATA */ 2889 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; 2890 break; 2891 case TCM_INVALID_CDB_FIELD: 2892 /* CURRENT ERROR */ 2893 buffer[offset] = 0x70; 2894 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2895 /* ILLEGAL REQUEST */ 2896 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2897 /* INVALID FIELD IN CDB */ 2898 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; 2899 break; 2900 case TCM_INVALID_PARAMETER_LIST: 2901 /* CURRENT ERROR */ 2902 buffer[offset] = 0x70; 2903 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2904 /* ILLEGAL REQUEST */ 2905 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2906 /* INVALID FIELD IN PARAMETER LIST */ 2907 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; 2908 break; 2909 case TCM_UNEXPECTED_UNSOLICITED_DATA: 2910 /* CURRENT ERROR */ 2911 buffer[offset] = 0x70; 2912 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2913 /* ABORTED COMMAND */ 2914 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2915 /* WRITE ERROR */ 2916 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; 2917 /* UNEXPECTED_UNSOLICITED_DATA */ 2918 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; 2919 break; 2920 case TCM_SERVICE_CRC_ERROR: 2921 /* CURRENT ERROR */ 2922 buffer[offset] = 0x70; 2923 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2924 /* ABORTED COMMAND */ 2925 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2926 /* PROTOCOL SERVICE CRC ERROR */ 2927 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; 2928 /* N/A */ 2929 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; 2930 break; 2931 case TCM_SNACK_REJECTED: 2932 /* CURRENT ERROR */ 2933 buffer[offset] = 0x70; 2934 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2935 /* ABORTED COMMAND */ 2936 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2937 /* READ ERROR */ 2938 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; 2939 /* FAILED RETRANSMISSION REQUEST */ 2940 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; 2941 break; 2942 case TCM_WRITE_PROTECTED: 2943 /* CURRENT ERROR */ 2944 buffer[offset] = 0x70; 2945 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2946 /* DATA PROTECT */ 2947 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; 2948 /* WRITE PROTECTED */ 2949 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; 2950 break; 2951 case TCM_ADDRESS_OUT_OF_RANGE: 2952 /* CURRENT ERROR */ 2953 buffer[offset] = 0x70; 2954 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2955 /* ILLEGAL REQUEST */ 2956 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2957 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ 2958 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21; 2959 break; 2960 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 2961 /* CURRENT ERROR */ 2962 buffer[offset] = 0x70; 2963 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2964 /* UNIT ATTENTION */ 2965 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; 2966 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); 2967 buffer[offset+SPC_ASC_KEY_OFFSET] = asc; 2968 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; 2969 break; 2970 case TCM_CHECK_CONDITION_NOT_READY: 2971 /* CURRENT ERROR */ 2972 buffer[offset] = 0x70; 2973 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2974 /* Not Ready */ 2975 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; 2976 transport_get_sense_codes(cmd, &asc, &ascq); 2977 buffer[offset+SPC_ASC_KEY_OFFSET] = asc; 2978 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; 2979 break; 2980 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 2981 default: 2982 /* CURRENT ERROR */ 2983 buffer[offset] = 0x70; 2984 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2985 /* ILLEGAL REQUEST */ 2986 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2987 /* LOGICAL UNIT COMMUNICATION FAILURE */ 2988 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; 2989 break; 2990 } 2991 /* 2992 * This code uses linux/include/scsi/scsi.h SAM status codes! 2993 */ 2994 cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 2995 /* 2996 * Automatically padded, this value is encoded in the fabric's 2997 * data_length response PDU containing the SCSI defined sense data. 2998 */ 2999 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; 3000 3001 after_reason: 3002 return cmd->se_tfo->queue_status(cmd); 3003 } 3004 EXPORT_SYMBOL(transport_send_check_condition_and_sense); 3005 3006 int transport_check_aborted_status(struct se_cmd *cmd, int send_status) 3007 { 3008 int ret = 0; 3009 3010 if (cmd->transport_state & CMD_T_ABORTED) { 3011 if (!send_status || 3012 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) 3013 return 1; 3014 3015 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" 3016 " status for CDB: 0x%02x ITT: 0x%08x\n", 3017 cmd->t_task_cdb[0], 3018 cmd->se_tfo->get_task_tag(cmd)); 3019 3020 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; 3021 cmd->se_tfo->queue_status(cmd); 3022 ret = 1; 3023 } 3024 return ret; 3025 } 3026 EXPORT_SYMBOL(transport_check_aborted_status); 3027 3028 void transport_send_task_abort(struct se_cmd *cmd) 3029 { 3030 unsigned long flags; 3031 3032 spin_lock_irqsave(&cmd->t_state_lock, flags); 3033 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 3034 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3035 return; 3036 } 3037 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3038 3039 /* 3040 * If there are still expected incoming fabric WRITEs, we wait 3041 * until until they have completed before sending a TASK_ABORTED 3042 * response. This response with TASK_ABORTED status will be 3043 * queued back to fabric module by transport_check_aborted_status(). 3044 */ 3045 if (cmd->data_direction == DMA_TO_DEVICE) { 3046 if (cmd->se_tfo->write_pending_status(cmd) != 0) { 3047 cmd->transport_state |= CMD_T_ABORTED; 3048 smp_mb__after_atomic_inc(); 3049 } 3050 } 3051 cmd->scsi_status = SAM_STAT_TASK_ABORTED; 3052 3053 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," 3054 " ITT: 0x%08x\n", cmd->t_task_cdb[0], 3055 cmd->se_tfo->get_task_tag(cmd)); 3056 3057 cmd->se_tfo->queue_status(cmd); 3058 } 3059 3060 static void target_tmr_work(struct work_struct *work) 3061 { 3062 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 3063 struct se_device *dev = cmd->se_dev; 3064 struct se_tmr_req *tmr = cmd->se_tmr_req; 3065 int ret; 3066 3067 switch (tmr->function) { 3068 case TMR_ABORT_TASK: 3069 core_tmr_abort_task(dev, tmr, cmd->se_sess); 3070 break; 3071 case TMR_ABORT_TASK_SET: 3072 case TMR_CLEAR_ACA: 3073 case TMR_CLEAR_TASK_SET: 3074 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; 3075 break; 3076 case TMR_LUN_RESET: 3077 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); 3078 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : 3079 TMR_FUNCTION_REJECTED; 3080 break; 3081 case TMR_TARGET_WARM_RESET: 3082 tmr->response = TMR_FUNCTION_REJECTED; 3083 break; 3084 case TMR_TARGET_COLD_RESET: 3085 tmr->response = TMR_FUNCTION_REJECTED; 3086 break; 3087 default: 3088 pr_err("Uknown TMR function: 0x%02x.\n", 3089 tmr->function); 3090 tmr->response = TMR_FUNCTION_REJECTED; 3091 break; 3092 } 3093 3094 cmd->t_state = TRANSPORT_ISTATE_PROCESSING; 3095 cmd->se_tfo->queue_tm_rsp(cmd); 3096 3097 transport_cmd_check_stop_to_fabric(cmd); 3098 } 3099 3100 int transport_generic_handle_tmr( 3101 struct se_cmd *cmd) 3102 { 3103 INIT_WORK(&cmd->work, target_tmr_work); 3104 queue_work(cmd->se_dev->tmr_wq, &cmd->work); 3105 return 0; 3106 } 3107 EXPORT_SYMBOL(transport_generic_handle_tmr); 3108