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 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) 571 { 572 struct se_device *dev = cmd->se_dev; 573 int success = scsi_status == GOOD; 574 unsigned long flags; 575 576 cmd->scsi_status = scsi_status; 577 578 579 spin_lock_irqsave(&cmd->t_state_lock, flags); 580 cmd->transport_state &= ~CMD_T_BUSY; 581 582 if (dev && dev->transport->transport_complete) { 583 if (dev->transport->transport_complete(cmd, 584 cmd->t_data_sg) != 0) { 585 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; 586 success = 1; 587 } 588 } 589 590 /* 591 * See if we are waiting to complete for an exception condition. 592 */ 593 if (cmd->transport_state & CMD_T_REQUEST_STOP) { 594 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 595 complete(&cmd->task_stop_comp); 596 return; 597 } 598 599 if (!success) 600 cmd->transport_state |= CMD_T_FAILED; 601 602 /* 603 * Check for case where an explict ABORT_TASK has been received 604 * and transport_wait_for_tasks() will be waiting for completion.. 605 */ 606 if (cmd->transport_state & CMD_T_ABORTED && 607 cmd->transport_state & CMD_T_STOP) { 608 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 609 complete(&cmd->t_transport_stop_comp); 610 return; 611 } else if (cmd->transport_state & CMD_T_FAILED) { 612 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 613 INIT_WORK(&cmd->work, target_complete_failure_work); 614 } else { 615 INIT_WORK(&cmd->work, target_complete_ok_work); 616 } 617 618 cmd->t_state = TRANSPORT_COMPLETE; 619 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); 620 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 621 622 queue_work(target_completion_wq, &cmd->work); 623 } 624 EXPORT_SYMBOL(target_complete_cmd); 625 626 static void target_add_to_state_list(struct se_cmd *cmd) 627 { 628 struct se_device *dev = cmd->se_dev; 629 unsigned long flags; 630 631 spin_lock_irqsave(&dev->execute_task_lock, flags); 632 if (!cmd->state_active) { 633 list_add_tail(&cmd->state_list, &dev->state_list); 634 cmd->state_active = true; 635 } 636 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 637 } 638 639 /* 640 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status 641 */ 642 static void transport_write_pending_qf(struct se_cmd *cmd); 643 static void transport_complete_qf(struct se_cmd *cmd); 644 645 static void target_qf_do_work(struct work_struct *work) 646 { 647 struct se_device *dev = container_of(work, struct se_device, 648 qf_work_queue); 649 LIST_HEAD(qf_cmd_list); 650 struct se_cmd *cmd, *cmd_tmp; 651 652 spin_lock_irq(&dev->qf_cmd_lock); 653 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); 654 spin_unlock_irq(&dev->qf_cmd_lock); 655 656 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { 657 list_del(&cmd->se_qf_node); 658 atomic_dec(&dev->dev_qf_count); 659 smp_mb__after_atomic_dec(); 660 661 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" 662 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, 663 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : 664 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" 665 : "UNKNOWN"); 666 667 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) 668 transport_write_pending_qf(cmd); 669 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) 670 transport_complete_qf(cmd); 671 } 672 } 673 674 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) 675 { 676 switch (cmd->data_direction) { 677 case DMA_NONE: 678 return "NONE"; 679 case DMA_FROM_DEVICE: 680 return "READ"; 681 case DMA_TO_DEVICE: 682 return "WRITE"; 683 case DMA_BIDIRECTIONAL: 684 return "BIDI"; 685 default: 686 break; 687 } 688 689 return "UNKNOWN"; 690 } 691 692 void transport_dump_dev_state( 693 struct se_device *dev, 694 char *b, 695 int *bl) 696 { 697 *bl += sprintf(b + *bl, "Status: "); 698 switch (dev->dev_status) { 699 case TRANSPORT_DEVICE_ACTIVATED: 700 *bl += sprintf(b + *bl, "ACTIVATED"); 701 break; 702 case TRANSPORT_DEVICE_DEACTIVATED: 703 *bl += sprintf(b + *bl, "DEACTIVATED"); 704 break; 705 case TRANSPORT_DEVICE_SHUTDOWN: 706 *bl += sprintf(b + *bl, "SHUTDOWN"); 707 break; 708 case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: 709 case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: 710 *bl += sprintf(b + *bl, "OFFLINE"); 711 break; 712 default: 713 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); 714 break; 715 } 716 717 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); 718 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", 719 dev->se_sub_dev->se_dev_attrib.block_size, 720 dev->se_sub_dev->se_dev_attrib.hw_max_sectors); 721 *bl += sprintf(b + *bl, " "); 722 } 723 724 void transport_dump_vpd_proto_id( 725 struct t10_vpd *vpd, 726 unsigned char *p_buf, 727 int p_buf_len) 728 { 729 unsigned char buf[VPD_TMP_BUF_SIZE]; 730 int len; 731 732 memset(buf, 0, VPD_TMP_BUF_SIZE); 733 len = sprintf(buf, "T10 VPD Protocol Identifier: "); 734 735 switch (vpd->protocol_identifier) { 736 case 0x00: 737 sprintf(buf+len, "Fibre Channel\n"); 738 break; 739 case 0x10: 740 sprintf(buf+len, "Parallel SCSI\n"); 741 break; 742 case 0x20: 743 sprintf(buf+len, "SSA\n"); 744 break; 745 case 0x30: 746 sprintf(buf+len, "IEEE 1394\n"); 747 break; 748 case 0x40: 749 sprintf(buf+len, "SCSI Remote Direct Memory Access" 750 " Protocol\n"); 751 break; 752 case 0x50: 753 sprintf(buf+len, "Internet SCSI (iSCSI)\n"); 754 break; 755 case 0x60: 756 sprintf(buf+len, "SAS Serial SCSI Protocol\n"); 757 break; 758 case 0x70: 759 sprintf(buf+len, "Automation/Drive Interface Transport" 760 " Protocol\n"); 761 break; 762 case 0x80: 763 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); 764 break; 765 default: 766 sprintf(buf+len, "Unknown 0x%02x\n", 767 vpd->protocol_identifier); 768 break; 769 } 770 771 if (p_buf) 772 strncpy(p_buf, buf, p_buf_len); 773 else 774 pr_debug("%s", buf); 775 } 776 777 void 778 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) 779 { 780 /* 781 * Check if the Protocol Identifier Valid (PIV) bit is set.. 782 * 783 * from spc3r23.pdf section 7.5.1 784 */ 785 if (page_83[1] & 0x80) { 786 vpd->protocol_identifier = (page_83[0] & 0xf0); 787 vpd->protocol_identifier_set = 1; 788 transport_dump_vpd_proto_id(vpd, NULL, 0); 789 } 790 } 791 EXPORT_SYMBOL(transport_set_vpd_proto_id); 792 793 int transport_dump_vpd_assoc( 794 struct t10_vpd *vpd, 795 unsigned char *p_buf, 796 int p_buf_len) 797 { 798 unsigned char buf[VPD_TMP_BUF_SIZE]; 799 int ret = 0; 800 int len; 801 802 memset(buf, 0, VPD_TMP_BUF_SIZE); 803 len = sprintf(buf, "T10 VPD Identifier Association: "); 804 805 switch (vpd->association) { 806 case 0x00: 807 sprintf(buf+len, "addressed logical unit\n"); 808 break; 809 case 0x10: 810 sprintf(buf+len, "target port\n"); 811 break; 812 case 0x20: 813 sprintf(buf+len, "SCSI target device\n"); 814 break; 815 default: 816 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); 817 ret = -EINVAL; 818 break; 819 } 820 821 if (p_buf) 822 strncpy(p_buf, buf, p_buf_len); 823 else 824 pr_debug("%s", buf); 825 826 return ret; 827 } 828 829 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) 830 { 831 /* 832 * The VPD identification association.. 833 * 834 * from spc3r23.pdf Section 7.6.3.1 Table 297 835 */ 836 vpd->association = (page_83[1] & 0x30); 837 return transport_dump_vpd_assoc(vpd, NULL, 0); 838 } 839 EXPORT_SYMBOL(transport_set_vpd_assoc); 840 841 int transport_dump_vpd_ident_type( 842 struct t10_vpd *vpd, 843 unsigned char *p_buf, 844 int p_buf_len) 845 { 846 unsigned char buf[VPD_TMP_BUF_SIZE]; 847 int ret = 0; 848 int len; 849 850 memset(buf, 0, VPD_TMP_BUF_SIZE); 851 len = sprintf(buf, "T10 VPD Identifier Type: "); 852 853 switch (vpd->device_identifier_type) { 854 case 0x00: 855 sprintf(buf+len, "Vendor specific\n"); 856 break; 857 case 0x01: 858 sprintf(buf+len, "T10 Vendor ID based\n"); 859 break; 860 case 0x02: 861 sprintf(buf+len, "EUI-64 based\n"); 862 break; 863 case 0x03: 864 sprintf(buf+len, "NAA\n"); 865 break; 866 case 0x04: 867 sprintf(buf+len, "Relative target port identifier\n"); 868 break; 869 case 0x08: 870 sprintf(buf+len, "SCSI name string\n"); 871 break; 872 default: 873 sprintf(buf+len, "Unsupported: 0x%02x\n", 874 vpd->device_identifier_type); 875 ret = -EINVAL; 876 break; 877 } 878 879 if (p_buf) { 880 if (p_buf_len < strlen(buf)+1) 881 return -EINVAL; 882 strncpy(p_buf, buf, p_buf_len); 883 } else { 884 pr_debug("%s", buf); 885 } 886 887 return ret; 888 } 889 890 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) 891 { 892 /* 893 * The VPD identifier type.. 894 * 895 * from spc3r23.pdf Section 7.6.3.1 Table 298 896 */ 897 vpd->device_identifier_type = (page_83[1] & 0x0f); 898 return transport_dump_vpd_ident_type(vpd, NULL, 0); 899 } 900 EXPORT_SYMBOL(transport_set_vpd_ident_type); 901 902 int transport_dump_vpd_ident( 903 struct t10_vpd *vpd, 904 unsigned char *p_buf, 905 int p_buf_len) 906 { 907 unsigned char buf[VPD_TMP_BUF_SIZE]; 908 int ret = 0; 909 910 memset(buf, 0, VPD_TMP_BUF_SIZE); 911 912 switch (vpd->device_identifier_code_set) { 913 case 0x01: /* Binary */ 914 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", 915 &vpd->device_identifier[0]); 916 break; 917 case 0x02: /* ASCII */ 918 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", 919 &vpd->device_identifier[0]); 920 break; 921 case 0x03: /* UTF-8 */ 922 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", 923 &vpd->device_identifier[0]); 924 break; 925 default: 926 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" 927 " 0x%02x", vpd->device_identifier_code_set); 928 ret = -EINVAL; 929 break; 930 } 931 932 if (p_buf) 933 strncpy(p_buf, buf, p_buf_len); 934 else 935 pr_debug("%s", buf); 936 937 return ret; 938 } 939 940 int 941 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) 942 { 943 static const char hex_str[] = "0123456789abcdef"; 944 int j = 0, i = 4; /* offset to start of the identifer */ 945 946 /* 947 * The VPD Code Set (encoding) 948 * 949 * from spc3r23.pdf Section 7.6.3.1 Table 296 950 */ 951 vpd->device_identifier_code_set = (page_83[0] & 0x0f); 952 switch (vpd->device_identifier_code_set) { 953 case 0x01: /* Binary */ 954 vpd->device_identifier[j++] = 955 hex_str[vpd->device_identifier_type]; 956 while (i < (4 + page_83[3])) { 957 vpd->device_identifier[j++] = 958 hex_str[(page_83[i] & 0xf0) >> 4]; 959 vpd->device_identifier[j++] = 960 hex_str[page_83[i] & 0x0f]; 961 i++; 962 } 963 break; 964 case 0x02: /* ASCII */ 965 case 0x03: /* UTF-8 */ 966 while (i < (4 + page_83[3])) 967 vpd->device_identifier[j++] = page_83[i++]; 968 break; 969 default: 970 break; 971 } 972 973 return transport_dump_vpd_ident(vpd, NULL, 0); 974 } 975 EXPORT_SYMBOL(transport_set_vpd_ident); 976 977 static void core_setup_task_attr_emulation(struct se_device *dev) 978 { 979 /* 980 * If this device is from Target_Core_Mod/pSCSI, disable the 981 * SAM Task Attribute emulation. 982 * 983 * This is currently not available in upsream Linux/SCSI Target 984 * mode code, and is assumed to be disabled while using TCM/pSCSI. 985 */ 986 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { 987 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; 988 return; 989 } 990 991 dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; 992 pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" 993 " device\n", dev->transport->name, 994 dev->transport->get_device_rev(dev)); 995 } 996 997 static void scsi_dump_inquiry(struct se_device *dev) 998 { 999 struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn; 1000 char buf[17]; 1001 int i, device_type; 1002 /* 1003 * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer 1004 */ 1005 for (i = 0; i < 8; i++) 1006 if (wwn->vendor[i] >= 0x20) 1007 buf[i] = wwn->vendor[i]; 1008 else 1009 buf[i] = ' '; 1010 buf[i] = '\0'; 1011 pr_debug(" Vendor: %s\n", buf); 1012 1013 for (i = 0; i < 16; i++) 1014 if (wwn->model[i] >= 0x20) 1015 buf[i] = wwn->model[i]; 1016 else 1017 buf[i] = ' '; 1018 buf[i] = '\0'; 1019 pr_debug(" Model: %s\n", buf); 1020 1021 for (i = 0; i < 4; i++) 1022 if (wwn->revision[i] >= 0x20) 1023 buf[i] = wwn->revision[i]; 1024 else 1025 buf[i] = ' '; 1026 buf[i] = '\0'; 1027 pr_debug(" Revision: %s\n", buf); 1028 1029 device_type = dev->transport->get_device_type(dev); 1030 pr_debug(" Type: %s ", scsi_device_type(device_type)); 1031 pr_debug(" ANSI SCSI revision: %02x\n", 1032 dev->transport->get_device_rev(dev)); 1033 } 1034 1035 struct se_device *transport_add_device_to_core_hba( 1036 struct se_hba *hba, 1037 struct se_subsystem_api *transport, 1038 struct se_subsystem_dev *se_dev, 1039 u32 device_flags, 1040 void *transport_dev, 1041 struct se_dev_limits *dev_limits, 1042 const char *inquiry_prod, 1043 const char *inquiry_rev) 1044 { 1045 int force_pt; 1046 struct se_device *dev; 1047 1048 dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); 1049 if (!dev) { 1050 pr_err("Unable to allocate memory for se_dev_t\n"); 1051 return NULL; 1052 } 1053 1054 dev->dev_flags = device_flags; 1055 dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; 1056 dev->dev_ptr = transport_dev; 1057 dev->se_hba = hba; 1058 dev->se_sub_dev = se_dev; 1059 dev->transport = transport; 1060 INIT_LIST_HEAD(&dev->dev_list); 1061 INIT_LIST_HEAD(&dev->dev_sep_list); 1062 INIT_LIST_HEAD(&dev->dev_tmr_list); 1063 INIT_LIST_HEAD(&dev->delayed_cmd_list); 1064 INIT_LIST_HEAD(&dev->state_list); 1065 INIT_LIST_HEAD(&dev->qf_cmd_list); 1066 spin_lock_init(&dev->execute_task_lock); 1067 spin_lock_init(&dev->delayed_cmd_lock); 1068 spin_lock_init(&dev->dev_reservation_lock); 1069 spin_lock_init(&dev->dev_status_lock); 1070 spin_lock_init(&dev->se_port_lock); 1071 spin_lock_init(&dev->se_tmr_lock); 1072 spin_lock_init(&dev->qf_cmd_lock); 1073 atomic_set(&dev->dev_ordered_id, 0); 1074 1075 se_dev_set_default_attribs(dev, dev_limits); 1076 1077 dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); 1078 dev->creation_time = get_jiffies_64(); 1079 spin_lock_init(&dev->stats_lock); 1080 1081 spin_lock(&hba->device_lock); 1082 list_add_tail(&dev->dev_list, &hba->hba_dev_list); 1083 hba->dev_count++; 1084 spin_unlock(&hba->device_lock); 1085 /* 1086 * Setup the SAM Task Attribute emulation for struct se_device 1087 */ 1088 core_setup_task_attr_emulation(dev); 1089 /* 1090 * Force PR and ALUA passthrough emulation with internal object use. 1091 */ 1092 force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); 1093 /* 1094 * Setup the Reservations infrastructure for struct se_device 1095 */ 1096 core_setup_reservations(dev, force_pt); 1097 /* 1098 * Setup the Asymmetric Logical Unit Assignment for struct se_device 1099 */ 1100 if (core_setup_alua(dev, force_pt) < 0) 1101 goto err_dev_list; 1102 1103 /* 1104 * Startup the struct se_device processing thread 1105 */ 1106 dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1, 1107 dev->transport->name); 1108 if (!dev->tmr_wq) { 1109 pr_err("Unable to create tmr workqueue for %s\n", 1110 dev->transport->name); 1111 goto err_dev_list; 1112 } 1113 /* 1114 * Setup work_queue for QUEUE_FULL 1115 */ 1116 INIT_WORK(&dev->qf_work_queue, target_qf_do_work); 1117 /* 1118 * Preload the initial INQUIRY const values if we are doing 1119 * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI 1120 * passthrough because this is being provided by the backend LLD. 1121 * This is required so that transport_get_inquiry() copies these 1122 * originals once back into DEV_T10_WWN(dev) for the virtual device 1123 * setup. 1124 */ 1125 if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { 1126 if (!inquiry_prod || !inquiry_rev) { 1127 pr_err("All non TCM/pSCSI plugins require" 1128 " INQUIRY consts\n"); 1129 goto err_wq; 1130 } 1131 1132 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8); 1133 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16); 1134 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4); 1135 } 1136 scsi_dump_inquiry(dev); 1137 1138 return dev; 1139 1140 err_wq: 1141 destroy_workqueue(dev->tmr_wq); 1142 err_dev_list: 1143 spin_lock(&hba->device_lock); 1144 list_del(&dev->dev_list); 1145 hba->dev_count--; 1146 spin_unlock(&hba->device_lock); 1147 1148 se_release_vpd_for_dev(dev); 1149 1150 kfree(dev); 1151 1152 return NULL; 1153 } 1154 EXPORT_SYMBOL(transport_add_device_to_core_hba); 1155 1156 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size) 1157 { 1158 struct se_device *dev = cmd->se_dev; 1159 1160 if (cmd->unknown_data_length) { 1161 cmd->data_length = size; 1162 } else if (size != cmd->data_length) { 1163 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" 1164 " %u does not match SCSI CDB Length: %u for SAM Opcode:" 1165 " 0x%02x\n", cmd->se_tfo->get_fabric_name(), 1166 cmd->data_length, size, cmd->t_task_cdb[0]); 1167 1168 if (cmd->data_direction == DMA_TO_DEVICE) { 1169 pr_err("Rejecting underflow/overflow" 1170 " WRITE data\n"); 1171 goto out_invalid_cdb_field; 1172 } 1173 /* 1174 * Reject READ_* or WRITE_* with overflow/underflow for 1175 * type SCF_SCSI_DATA_CDB. 1176 */ 1177 if (dev->se_sub_dev->se_dev_attrib.block_size != 512) { 1178 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" 1179 " CDB on non 512-byte sector setup subsystem" 1180 " plugin: %s\n", dev->transport->name); 1181 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ 1182 goto out_invalid_cdb_field; 1183 } 1184 1185 if (size > cmd->data_length) { 1186 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; 1187 cmd->residual_count = (size - cmd->data_length); 1188 } else { 1189 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 1190 cmd->residual_count = (cmd->data_length - size); 1191 } 1192 cmd->data_length = size; 1193 } 1194 1195 return 0; 1196 1197 out_invalid_cdb_field: 1198 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1199 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1200 return -EINVAL; 1201 } 1202 1203 /* 1204 * Used by fabric modules containing a local struct se_cmd within their 1205 * fabric dependent per I/O descriptor. 1206 */ 1207 void transport_init_se_cmd( 1208 struct se_cmd *cmd, 1209 struct target_core_fabric_ops *tfo, 1210 struct se_session *se_sess, 1211 u32 data_length, 1212 int data_direction, 1213 int task_attr, 1214 unsigned char *sense_buffer) 1215 { 1216 INIT_LIST_HEAD(&cmd->se_lun_node); 1217 INIT_LIST_HEAD(&cmd->se_delayed_node); 1218 INIT_LIST_HEAD(&cmd->se_qf_node); 1219 INIT_LIST_HEAD(&cmd->se_cmd_list); 1220 INIT_LIST_HEAD(&cmd->state_list); 1221 init_completion(&cmd->transport_lun_fe_stop_comp); 1222 init_completion(&cmd->transport_lun_stop_comp); 1223 init_completion(&cmd->t_transport_stop_comp); 1224 init_completion(&cmd->cmd_wait_comp); 1225 init_completion(&cmd->task_stop_comp); 1226 spin_lock_init(&cmd->t_state_lock); 1227 cmd->transport_state = CMD_T_DEV_ACTIVE; 1228 1229 cmd->se_tfo = tfo; 1230 cmd->se_sess = se_sess; 1231 cmd->data_length = data_length; 1232 cmd->data_direction = data_direction; 1233 cmd->sam_task_attr = task_attr; 1234 cmd->sense_buffer = sense_buffer; 1235 1236 cmd->state_active = false; 1237 } 1238 EXPORT_SYMBOL(transport_init_se_cmd); 1239 1240 static int transport_check_alloc_task_attr(struct se_cmd *cmd) 1241 { 1242 /* 1243 * Check if SAM Task Attribute emulation is enabled for this 1244 * struct se_device storage object 1245 */ 1246 if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) 1247 return 0; 1248 1249 if (cmd->sam_task_attr == MSG_ACA_TAG) { 1250 pr_debug("SAM Task Attribute ACA" 1251 " emulation is not supported\n"); 1252 return -EINVAL; 1253 } 1254 /* 1255 * Used to determine when ORDERED commands should go from 1256 * Dormant to Active status. 1257 */ 1258 cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id); 1259 smp_mb__after_atomic_inc(); 1260 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", 1261 cmd->se_ordered_id, cmd->sam_task_attr, 1262 cmd->se_dev->transport->name); 1263 return 0; 1264 } 1265 1266 /* target_setup_cmd_from_cdb(): 1267 * 1268 * Called from fabric RX Thread. 1269 */ 1270 int target_setup_cmd_from_cdb( 1271 struct se_cmd *cmd, 1272 unsigned char *cdb) 1273 { 1274 struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev; 1275 u32 pr_reg_type = 0; 1276 u8 alua_ascq = 0; 1277 unsigned long flags; 1278 int ret; 1279 1280 /* 1281 * Ensure that the received CDB is less than the max (252 + 8) bytes 1282 * for VARIABLE_LENGTH_CMD 1283 */ 1284 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { 1285 pr_err("Received SCSI CDB with command_size: %d that" 1286 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", 1287 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); 1288 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1289 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1290 return -EINVAL; 1291 } 1292 /* 1293 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, 1294 * allocate the additional extended CDB buffer now.. Otherwise 1295 * setup the pointer from __t_task_cdb to t_task_cdb. 1296 */ 1297 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { 1298 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), 1299 GFP_KERNEL); 1300 if (!cmd->t_task_cdb) { 1301 pr_err("Unable to allocate cmd->t_task_cdb" 1302 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", 1303 scsi_command_size(cdb), 1304 (unsigned long)sizeof(cmd->__t_task_cdb)); 1305 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1306 cmd->scsi_sense_reason = 1307 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1308 return -ENOMEM; 1309 } 1310 } else 1311 cmd->t_task_cdb = &cmd->__t_task_cdb[0]; 1312 /* 1313 * Copy the original CDB into cmd-> 1314 */ 1315 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); 1316 1317 /* 1318 * Check for an existing UNIT ATTENTION condition 1319 */ 1320 if (core_scsi3_ua_check(cmd, cdb) < 0) { 1321 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1322 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; 1323 return -EINVAL; 1324 } 1325 1326 ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq); 1327 if (ret != 0) { 1328 /* 1329 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; 1330 * The ALUA additional sense code qualifier (ASCQ) is determined 1331 * by the ALUA primary or secondary access state.. 1332 */ 1333 if (ret > 0) { 1334 pr_debug("[%s]: ALUA TG Port not available, " 1335 "SenseKey: NOT_READY, ASC/ASCQ: " 1336 "0x04/0x%02x\n", 1337 cmd->se_tfo->get_fabric_name(), alua_ascq); 1338 1339 transport_set_sense_codes(cmd, 0x04, alua_ascq); 1340 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1341 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; 1342 return -EINVAL; 1343 } 1344 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1345 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1346 return -EINVAL; 1347 } 1348 1349 /* 1350 * Check status for SPC-3 Persistent Reservations 1351 */ 1352 if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) { 1353 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder( 1354 cmd, cdb, pr_reg_type) != 0) { 1355 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1356 cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; 1357 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1358 cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT; 1359 return -EBUSY; 1360 } 1361 /* 1362 * This means the CDB is allowed for the SCSI Initiator port 1363 * when said port is *NOT* holding the legacy SPC-2 or 1364 * SPC-3 Persistent Reservation. 1365 */ 1366 } 1367 1368 ret = cmd->se_dev->transport->parse_cdb(cmd); 1369 if (ret < 0) 1370 return ret; 1371 1372 spin_lock_irqsave(&cmd->t_state_lock, flags); 1373 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; 1374 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 1375 1376 /* 1377 * Check for SAM Task Attribute Emulation 1378 */ 1379 if (transport_check_alloc_task_attr(cmd) < 0) { 1380 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 1381 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 1382 return -EINVAL; 1383 } 1384 spin_lock(&cmd->se_lun->lun_sep_lock); 1385 if (cmd->se_lun->lun_sep) 1386 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; 1387 spin_unlock(&cmd->se_lun->lun_sep_lock); 1388 return 0; 1389 } 1390 EXPORT_SYMBOL(target_setup_cmd_from_cdb); 1391 1392 /* 1393 * Used by fabric module frontends to queue tasks directly. 1394 * Many only be used from process context only 1395 */ 1396 int transport_handle_cdb_direct( 1397 struct se_cmd *cmd) 1398 { 1399 int ret; 1400 1401 if (!cmd->se_lun) { 1402 dump_stack(); 1403 pr_err("cmd->se_lun is NULL\n"); 1404 return -EINVAL; 1405 } 1406 if (in_interrupt()) { 1407 dump_stack(); 1408 pr_err("transport_generic_handle_cdb cannot be called" 1409 " from interrupt context\n"); 1410 return -EINVAL; 1411 } 1412 /* 1413 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that 1414 * outstanding descriptors are handled correctly during shutdown via 1415 * transport_wait_for_tasks() 1416 * 1417 * Also, we don't take cmd->t_state_lock here as we only expect 1418 * this to be called for initial descriptor submission. 1419 */ 1420 cmd->t_state = TRANSPORT_NEW_CMD; 1421 cmd->transport_state |= CMD_T_ACTIVE; 1422 1423 /* 1424 * transport_generic_new_cmd() is already handling QUEUE_FULL, 1425 * so follow TRANSPORT_NEW_CMD processing thread context usage 1426 * and call transport_generic_request_failure() if necessary.. 1427 */ 1428 ret = transport_generic_new_cmd(cmd); 1429 if (ret < 0) 1430 transport_generic_request_failure(cmd); 1431 1432 return 0; 1433 } 1434 EXPORT_SYMBOL(transport_handle_cdb_direct); 1435 1436 /** 1437 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd 1438 * 1439 * @se_cmd: command descriptor to submit 1440 * @se_sess: associated se_sess for endpoint 1441 * @cdb: pointer to SCSI CDB 1442 * @sense: pointer to SCSI sense buffer 1443 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1444 * @data_length: fabric expected data transfer length 1445 * @task_addr: SAM task attribute 1446 * @data_dir: DMA data direction 1447 * @flags: flags for command submission from target_sc_flags_tables 1448 * 1449 * Returns non zero to signal active I/O shutdown failure. All other 1450 * setup exceptions will be returned as a SCSI CHECK_CONDITION response, 1451 * but still return zero here. 1452 * 1453 * This may only be called from process context, and also currently 1454 * assumes internal allocation of fabric payload buffer by target-core. 1455 **/ 1456 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, 1457 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, 1458 u32 data_length, int task_attr, int data_dir, int flags) 1459 { 1460 struct se_portal_group *se_tpg; 1461 int rc; 1462 1463 se_tpg = se_sess->se_tpg; 1464 BUG_ON(!se_tpg); 1465 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); 1466 BUG_ON(in_interrupt()); 1467 /* 1468 * Initialize se_cmd for target operation. From this point 1469 * exceptions are handled by sending exception status via 1470 * target_core_fabric_ops->queue_status() callback 1471 */ 1472 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1473 data_length, data_dir, task_attr, sense); 1474 if (flags & TARGET_SCF_UNKNOWN_SIZE) 1475 se_cmd->unknown_data_length = 1; 1476 /* 1477 * Obtain struct se_cmd->cmd_kref reference and add new cmd to 1478 * se_sess->sess_cmd_list. A second kref_get here is necessary 1479 * for fabrics using TARGET_SCF_ACK_KREF that expect a second 1480 * kref_put() to happen during fabric packet acknowledgement. 1481 */ 1482 rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1483 if (rc) 1484 return rc; 1485 /* 1486 * Signal bidirectional data payloads to target-core 1487 */ 1488 if (flags & TARGET_SCF_BIDI_OP) 1489 se_cmd->se_cmd_flags |= SCF_BIDI; 1490 /* 1491 * Locate se_lun pointer and attach it to struct se_cmd 1492 */ 1493 if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) { 1494 transport_send_check_condition_and_sense(se_cmd, 1495 se_cmd->scsi_sense_reason, 0); 1496 target_put_sess_cmd(se_sess, se_cmd); 1497 return 0; 1498 } 1499 1500 rc = target_setup_cmd_from_cdb(se_cmd, cdb); 1501 if (rc != 0) { 1502 transport_generic_request_failure(se_cmd); 1503 return 0; 1504 } 1505 1506 /* 1507 * Check if we need to delay processing because of ALUA 1508 * Active/NonOptimized primary access state.. 1509 */ 1510 core_alua_check_nonop_delay(se_cmd); 1511 1512 transport_handle_cdb_direct(se_cmd); 1513 return 0; 1514 } 1515 EXPORT_SYMBOL(target_submit_cmd); 1516 1517 static void target_complete_tmr_failure(struct work_struct *work) 1518 { 1519 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); 1520 1521 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; 1522 se_cmd->se_tfo->queue_tm_rsp(se_cmd); 1523 transport_generic_free_cmd(se_cmd, 0); 1524 } 1525 1526 /** 1527 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd 1528 * for TMR CDBs 1529 * 1530 * @se_cmd: command descriptor to submit 1531 * @se_sess: associated se_sess for endpoint 1532 * @sense: pointer to SCSI sense buffer 1533 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1534 * @fabric_context: fabric context for TMR req 1535 * @tm_type: Type of TM request 1536 * @gfp: gfp type for caller 1537 * @tag: referenced task tag for TMR_ABORT_TASK 1538 * @flags: submit cmd flags 1539 * 1540 * Callable from all contexts. 1541 **/ 1542 1543 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, 1544 unsigned char *sense, u32 unpacked_lun, 1545 void *fabric_tmr_ptr, unsigned char tm_type, 1546 gfp_t gfp, unsigned int tag, int flags) 1547 { 1548 struct se_portal_group *se_tpg; 1549 int ret; 1550 1551 se_tpg = se_sess->se_tpg; 1552 BUG_ON(!se_tpg); 1553 1554 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1555 0, DMA_NONE, MSG_SIMPLE_TAG, sense); 1556 /* 1557 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req 1558 * allocation failure. 1559 */ 1560 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); 1561 if (ret < 0) 1562 return -ENOMEM; 1563 1564 if (tm_type == TMR_ABORT_TASK) 1565 se_cmd->se_tmr_req->ref_task_tag = tag; 1566 1567 /* See target_submit_cmd for commentary */ 1568 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1569 if (ret) { 1570 core_tmr_release_req(se_cmd->se_tmr_req); 1571 return ret; 1572 } 1573 1574 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); 1575 if (ret) { 1576 /* 1577 * For callback during failure handling, push this work off 1578 * to process context with TMR_LUN_DOES_NOT_EXIST status. 1579 */ 1580 INIT_WORK(&se_cmd->work, target_complete_tmr_failure); 1581 schedule_work(&se_cmd->work); 1582 return 0; 1583 } 1584 transport_generic_handle_tmr(se_cmd); 1585 return 0; 1586 } 1587 EXPORT_SYMBOL(target_submit_tmr); 1588 1589 /* 1590 * If the cmd is active, request it to be stopped and sleep until it 1591 * has completed. 1592 */ 1593 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) 1594 { 1595 bool was_active = false; 1596 1597 if (cmd->transport_state & CMD_T_BUSY) { 1598 cmd->transport_state |= CMD_T_REQUEST_STOP; 1599 spin_unlock_irqrestore(&cmd->t_state_lock, *flags); 1600 1601 pr_debug("cmd %p waiting to complete\n", cmd); 1602 wait_for_completion(&cmd->task_stop_comp); 1603 pr_debug("cmd %p stopped successfully\n", cmd); 1604 1605 spin_lock_irqsave(&cmd->t_state_lock, *flags); 1606 cmd->transport_state &= ~CMD_T_REQUEST_STOP; 1607 cmd->transport_state &= ~CMD_T_BUSY; 1608 was_active = true; 1609 } 1610 1611 return was_active; 1612 } 1613 1614 /* 1615 * Handle SAM-esque emulation for generic transport request failures. 1616 */ 1617 void transport_generic_request_failure(struct se_cmd *cmd) 1618 { 1619 int ret = 0; 1620 1621 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" 1622 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), 1623 cmd->t_task_cdb[0]); 1624 pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n", 1625 cmd->se_tfo->get_cmd_state(cmd), 1626 cmd->t_state, cmd->scsi_sense_reason); 1627 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", 1628 (cmd->transport_state & CMD_T_ACTIVE) != 0, 1629 (cmd->transport_state & CMD_T_STOP) != 0, 1630 (cmd->transport_state & CMD_T_SENT) != 0); 1631 1632 /* 1633 * For SAM Task Attribute emulation for failed struct se_cmd 1634 */ 1635 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1636 transport_complete_task_attr(cmd); 1637 1638 switch (cmd->scsi_sense_reason) { 1639 case TCM_NON_EXISTENT_LUN: 1640 case TCM_UNSUPPORTED_SCSI_OPCODE: 1641 case TCM_INVALID_CDB_FIELD: 1642 case TCM_INVALID_PARAMETER_LIST: 1643 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 1644 case TCM_UNKNOWN_MODE_PAGE: 1645 case TCM_WRITE_PROTECTED: 1646 case TCM_ADDRESS_OUT_OF_RANGE: 1647 case TCM_CHECK_CONDITION_ABORT_CMD: 1648 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 1649 case TCM_CHECK_CONDITION_NOT_READY: 1650 break; 1651 case TCM_RESERVATION_CONFLICT: 1652 /* 1653 * No SENSE Data payload for this case, set SCSI Status 1654 * and queue the response to $FABRIC_MOD. 1655 * 1656 * Uses linux/include/scsi/scsi.h SAM status codes defs 1657 */ 1658 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1659 /* 1660 * For UA Interlock Code 11b, a RESERVATION CONFLICT will 1661 * establish a UNIT ATTENTION with PREVIOUS RESERVATION 1662 * CONFLICT STATUS. 1663 * 1664 * See spc4r17, section 7.4.6 Control Mode Page, Table 349 1665 */ 1666 if (cmd->se_sess && 1667 cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2) 1668 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, 1669 cmd->orig_fe_lun, 0x2C, 1670 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); 1671 1672 ret = cmd->se_tfo->queue_status(cmd); 1673 if (ret == -EAGAIN || ret == -ENOMEM) 1674 goto queue_full; 1675 goto check_stop; 1676 default: 1677 pr_err("Unknown transport error for CDB 0x%02x: %d\n", 1678 cmd->t_task_cdb[0], cmd->scsi_sense_reason); 1679 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1680 break; 1681 } 1682 1683 ret = transport_send_check_condition_and_sense(cmd, 1684 cmd->scsi_sense_reason, 0); 1685 if (ret == -EAGAIN || ret == -ENOMEM) 1686 goto queue_full; 1687 1688 check_stop: 1689 transport_lun_remove_cmd(cmd); 1690 if (!transport_cmd_check_stop_to_fabric(cmd)) 1691 ; 1692 return; 1693 1694 queue_full: 1695 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 1696 transport_handle_queue_full(cmd, cmd->se_dev); 1697 } 1698 EXPORT_SYMBOL(transport_generic_request_failure); 1699 1700 static void __target_execute_cmd(struct se_cmd *cmd) 1701 { 1702 int error = 0; 1703 1704 spin_lock_irq(&cmd->t_state_lock); 1705 cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT); 1706 spin_unlock_irq(&cmd->t_state_lock); 1707 1708 if (cmd->execute_cmd) 1709 error = cmd->execute_cmd(cmd); 1710 1711 if (error) { 1712 spin_lock_irq(&cmd->t_state_lock); 1713 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); 1714 spin_unlock_irq(&cmd->t_state_lock); 1715 1716 transport_generic_request_failure(cmd); 1717 } 1718 } 1719 1720 void target_execute_cmd(struct se_cmd *cmd) 1721 { 1722 struct se_device *dev = cmd->se_dev; 1723 1724 /* 1725 * If the received CDB has aleady been aborted stop processing it here. 1726 */ 1727 if (transport_check_aborted_status(cmd, 1)) 1728 return; 1729 1730 /* 1731 * Determine if IOCTL context caller in requesting the stopping of this 1732 * command for LUN shutdown purposes. 1733 */ 1734 spin_lock_irq(&cmd->t_state_lock); 1735 if (cmd->transport_state & CMD_T_LUN_STOP) { 1736 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n", 1737 __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd)); 1738 1739 cmd->transport_state &= ~CMD_T_ACTIVE; 1740 spin_unlock_irq(&cmd->t_state_lock); 1741 complete(&cmd->transport_lun_stop_comp); 1742 return; 1743 } 1744 /* 1745 * Determine if frontend context caller is requesting the stopping of 1746 * this command for frontend exceptions. 1747 */ 1748 if (cmd->transport_state & CMD_T_STOP) { 1749 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", 1750 __func__, __LINE__, 1751 cmd->se_tfo->get_task_tag(cmd)); 1752 1753 spin_unlock_irq(&cmd->t_state_lock); 1754 complete(&cmd->t_transport_stop_comp); 1755 return; 1756 } 1757 1758 cmd->t_state = TRANSPORT_PROCESSING; 1759 spin_unlock_irq(&cmd->t_state_lock); 1760 1761 if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) 1762 goto execute; 1763 1764 /* 1765 * Check for the existence of HEAD_OF_QUEUE, and if true return 1 1766 * to allow the passed struct se_cmd list of tasks to the front of the list. 1767 */ 1768 switch (cmd->sam_task_attr) { 1769 case MSG_HEAD_TAG: 1770 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " 1771 "se_ordered_id: %u\n", 1772 cmd->t_task_cdb[0], cmd->se_ordered_id); 1773 goto execute; 1774 case MSG_ORDERED_TAG: 1775 atomic_inc(&dev->dev_ordered_sync); 1776 smp_mb__after_atomic_inc(); 1777 1778 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " 1779 " se_ordered_id: %u\n", 1780 cmd->t_task_cdb[0], cmd->se_ordered_id); 1781 1782 /* 1783 * Execute an ORDERED command if no other older commands 1784 * exist that need to be completed first. 1785 */ 1786 if (!atomic_read(&dev->simple_cmds)) 1787 goto execute; 1788 break; 1789 default: 1790 /* 1791 * For SIMPLE and UNTAGGED Task Attribute commands 1792 */ 1793 atomic_inc(&dev->simple_cmds); 1794 smp_mb__after_atomic_inc(); 1795 break; 1796 } 1797 1798 if (atomic_read(&dev->dev_ordered_sync) != 0) { 1799 spin_lock(&dev->delayed_cmd_lock); 1800 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); 1801 spin_unlock(&dev->delayed_cmd_lock); 1802 1803 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" 1804 " delayed CMD list, se_ordered_id: %u\n", 1805 cmd->t_task_cdb[0], cmd->sam_task_attr, 1806 cmd->se_ordered_id); 1807 return; 1808 } 1809 1810 execute: 1811 /* 1812 * Otherwise, no ORDERED task attributes exist.. 1813 */ 1814 __target_execute_cmd(cmd); 1815 } 1816 EXPORT_SYMBOL(target_execute_cmd); 1817 1818 /* 1819 * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd 1820 */ 1821 static int transport_get_sense_data(struct se_cmd *cmd) 1822 { 1823 unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; 1824 struct se_device *dev = cmd->se_dev; 1825 unsigned long flags; 1826 u32 offset = 0; 1827 1828 WARN_ON(!cmd->se_lun); 1829 1830 if (!dev) 1831 return 0; 1832 1833 spin_lock_irqsave(&cmd->t_state_lock, flags); 1834 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 1835 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 1836 return 0; 1837 } 1838 1839 if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 1840 goto out; 1841 1842 if (!dev->transport->get_sense_buffer) { 1843 pr_err("dev->transport->get_sense_buffer is NULL\n"); 1844 goto out; 1845 } 1846 1847 sense_buffer = dev->transport->get_sense_buffer(cmd); 1848 if (!sense_buffer) { 1849 pr_err("ITT 0x%08x cmd %p: Unable to locate" 1850 " sense buffer for task with sense\n", 1851 cmd->se_tfo->get_task_tag(cmd), cmd); 1852 goto out; 1853 } 1854 1855 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 1856 1857 offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER); 1858 1859 memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER); 1860 1861 /* Automatically padded */ 1862 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; 1863 1864 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n", 1865 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); 1866 return 0; 1867 1868 out: 1869 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 1870 return -1; 1871 } 1872 1873 /* 1874 * Process all commands up to the last received ORDERED task attribute which 1875 * requires another blocking boundary 1876 */ 1877 static void target_restart_delayed_cmds(struct se_device *dev) 1878 { 1879 for (;;) { 1880 struct se_cmd *cmd; 1881 1882 spin_lock(&dev->delayed_cmd_lock); 1883 if (list_empty(&dev->delayed_cmd_list)) { 1884 spin_unlock(&dev->delayed_cmd_lock); 1885 break; 1886 } 1887 1888 cmd = list_entry(dev->delayed_cmd_list.next, 1889 struct se_cmd, se_delayed_node); 1890 list_del(&cmd->se_delayed_node); 1891 spin_unlock(&dev->delayed_cmd_lock); 1892 1893 __target_execute_cmd(cmd); 1894 1895 if (cmd->sam_task_attr == MSG_ORDERED_TAG) 1896 break; 1897 } 1898 } 1899 1900 /* 1901 * Called from I/O completion to determine which dormant/delayed 1902 * and ordered cmds need to have their tasks added to the execution queue. 1903 */ 1904 static void transport_complete_task_attr(struct se_cmd *cmd) 1905 { 1906 struct se_device *dev = cmd->se_dev; 1907 1908 if (cmd->sam_task_attr == MSG_SIMPLE_TAG) { 1909 atomic_dec(&dev->simple_cmds); 1910 smp_mb__after_atomic_dec(); 1911 dev->dev_cur_ordered_id++; 1912 pr_debug("Incremented dev->dev_cur_ordered_id: %u for" 1913 " SIMPLE: %u\n", dev->dev_cur_ordered_id, 1914 cmd->se_ordered_id); 1915 } else if (cmd->sam_task_attr == MSG_HEAD_TAG) { 1916 dev->dev_cur_ordered_id++; 1917 pr_debug("Incremented dev_cur_ordered_id: %u for" 1918 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, 1919 cmd->se_ordered_id); 1920 } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) { 1921 atomic_dec(&dev->dev_ordered_sync); 1922 smp_mb__after_atomic_dec(); 1923 1924 dev->dev_cur_ordered_id++; 1925 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" 1926 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); 1927 } 1928 1929 target_restart_delayed_cmds(dev); 1930 } 1931 1932 static void transport_complete_qf(struct se_cmd *cmd) 1933 { 1934 int ret = 0; 1935 1936 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1937 transport_complete_task_attr(cmd); 1938 1939 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 1940 ret = cmd->se_tfo->queue_status(cmd); 1941 if (ret) 1942 goto out; 1943 } 1944 1945 switch (cmd->data_direction) { 1946 case DMA_FROM_DEVICE: 1947 ret = cmd->se_tfo->queue_data_in(cmd); 1948 break; 1949 case DMA_TO_DEVICE: 1950 if (cmd->t_bidi_data_sg) { 1951 ret = cmd->se_tfo->queue_data_in(cmd); 1952 if (ret < 0) 1953 break; 1954 } 1955 /* Fall through for DMA_TO_DEVICE */ 1956 case DMA_NONE: 1957 ret = cmd->se_tfo->queue_status(cmd); 1958 break; 1959 default: 1960 break; 1961 } 1962 1963 out: 1964 if (ret < 0) { 1965 transport_handle_queue_full(cmd, cmd->se_dev); 1966 return; 1967 } 1968 transport_lun_remove_cmd(cmd); 1969 transport_cmd_check_stop_to_fabric(cmd); 1970 } 1971 1972 static void transport_handle_queue_full( 1973 struct se_cmd *cmd, 1974 struct se_device *dev) 1975 { 1976 spin_lock_irq(&dev->qf_cmd_lock); 1977 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); 1978 atomic_inc(&dev->dev_qf_count); 1979 smp_mb__after_atomic_inc(); 1980 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); 1981 1982 schedule_work(&cmd->se_dev->qf_work_queue); 1983 } 1984 1985 static void target_complete_ok_work(struct work_struct *work) 1986 { 1987 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 1988 int reason = 0, ret; 1989 1990 /* 1991 * Check if we need to move delayed/dormant tasks from cmds on the 1992 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task 1993 * Attribute. 1994 */ 1995 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) 1996 transport_complete_task_attr(cmd); 1997 /* 1998 * Check to schedule QUEUE_FULL work, or execute an existing 1999 * cmd->transport_qf_callback() 2000 */ 2001 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) 2002 schedule_work(&cmd->se_dev->qf_work_queue); 2003 2004 /* 2005 * Check if we need to retrieve a sense buffer from 2006 * the struct se_cmd in question. 2007 */ 2008 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 2009 if (transport_get_sense_data(cmd) < 0) 2010 reason = TCM_NON_EXISTENT_LUN; 2011 2012 if (cmd->scsi_status) { 2013 ret = transport_send_check_condition_and_sense( 2014 cmd, reason, 1); 2015 if (ret == -EAGAIN || ret == -ENOMEM) 2016 goto queue_full; 2017 2018 transport_lun_remove_cmd(cmd); 2019 transport_cmd_check_stop_to_fabric(cmd); 2020 return; 2021 } 2022 } 2023 /* 2024 * Check for a callback, used by amongst other things 2025 * XDWRITE_READ_10 emulation. 2026 */ 2027 if (cmd->transport_complete_callback) 2028 cmd->transport_complete_callback(cmd); 2029 2030 switch (cmd->data_direction) { 2031 case DMA_FROM_DEVICE: 2032 spin_lock(&cmd->se_lun->lun_sep_lock); 2033 if (cmd->se_lun->lun_sep) { 2034 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2035 cmd->data_length; 2036 } 2037 spin_unlock(&cmd->se_lun->lun_sep_lock); 2038 2039 ret = cmd->se_tfo->queue_data_in(cmd); 2040 if (ret == -EAGAIN || ret == -ENOMEM) 2041 goto queue_full; 2042 break; 2043 case DMA_TO_DEVICE: 2044 spin_lock(&cmd->se_lun->lun_sep_lock); 2045 if (cmd->se_lun->lun_sep) { 2046 cmd->se_lun->lun_sep->sep_stats.rx_data_octets += 2047 cmd->data_length; 2048 } 2049 spin_unlock(&cmd->se_lun->lun_sep_lock); 2050 /* 2051 * Check if we need to send READ payload for BIDI-COMMAND 2052 */ 2053 if (cmd->t_bidi_data_sg) { 2054 spin_lock(&cmd->se_lun->lun_sep_lock); 2055 if (cmd->se_lun->lun_sep) { 2056 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2057 cmd->data_length; 2058 } 2059 spin_unlock(&cmd->se_lun->lun_sep_lock); 2060 ret = cmd->se_tfo->queue_data_in(cmd); 2061 if (ret == -EAGAIN || ret == -ENOMEM) 2062 goto queue_full; 2063 break; 2064 } 2065 /* Fall through for DMA_TO_DEVICE */ 2066 case DMA_NONE: 2067 ret = cmd->se_tfo->queue_status(cmd); 2068 if (ret == -EAGAIN || ret == -ENOMEM) 2069 goto queue_full; 2070 break; 2071 default: 2072 break; 2073 } 2074 2075 transport_lun_remove_cmd(cmd); 2076 transport_cmd_check_stop_to_fabric(cmd); 2077 return; 2078 2079 queue_full: 2080 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," 2081 " data_direction: %d\n", cmd, cmd->data_direction); 2082 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 2083 transport_handle_queue_full(cmd, cmd->se_dev); 2084 } 2085 2086 static inline void transport_free_sgl(struct scatterlist *sgl, int nents) 2087 { 2088 struct scatterlist *sg; 2089 int count; 2090 2091 for_each_sg(sgl, sg, nents, count) 2092 __free_page(sg_page(sg)); 2093 2094 kfree(sgl); 2095 } 2096 2097 static inline void transport_free_pages(struct se_cmd *cmd) 2098 { 2099 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) 2100 return; 2101 2102 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); 2103 cmd->t_data_sg = NULL; 2104 cmd->t_data_nents = 0; 2105 2106 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); 2107 cmd->t_bidi_data_sg = NULL; 2108 cmd->t_bidi_data_nents = 0; 2109 } 2110 2111 /** 2112 * transport_release_cmd - free a command 2113 * @cmd: command to free 2114 * 2115 * This routine unconditionally frees a command, and reference counting 2116 * or list removal must be done in the caller. 2117 */ 2118 static void transport_release_cmd(struct se_cmd *cmd) 2119 { 2120 BUG_ON(!cmd->se_tfo); 2121 2122 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 2123 core_tmr_release_req(cmd->se_tmr_req); 2124 if (cmd->t_task_cdb != cmd->__t_task_cdb) 2125 kfree(cmd->t_task_cdb); 2126 /* 2127 * If this cmd has been setup with target_get_sess_cmd(), drop 2128 * the kref and call ->release_cmd() in kref callback. 2129 */ 2130 if (cmd->check_release != 0) { 2131 target_put_sess_cmd(cmd->se_sess, cmd); 2132 return; 2133 } 2134 cmd->se_tfo->release_cmd(cmd); 2135 } 2136 2137 /** 2138 * transport_put_cmd - release a reference to a command 2139 * @cmd: command to release 2140 * 2141 * This routine releases our reference to the command and frees it if possible. 2142 */ 2143 static void transport_put_cmd(struct se_cmd *cmd) 2144 { 2145 unsigned long flags; 2146 2147 spin_lock_irqsave(&cmd->t_state_lock, flags); 2148 if (atomic_read(&cmd->t_fe_count)) { 2149 if (!atomic_dec_and_test(&cmd->t_fe_count)) 2150 goto out_busy; 2151 } 2152 2153 if (cmd->transport_state & CMD_T_DEV_ACTIVE) { 2154 cmd->transport_state &= ~CMD_T_DEV_ACTIVE; 2155 target_remove_from_state_list(cmd); 2156 } 2157 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2158 2159 transport_free_pages(cmd); 2160 transport_release_cmd(cmd); 2161 return; 2162 out_busy: 2163 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2164 } 2165 2166 /* 2167 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of 2168 * allocating in the core. 2169 * @cmd: Associated se_cmd descriptor 2170 * @mem: SGL style memory for TCM WRITE / READ 2171 * @sg_mem_num: Number of SGL elements 2172 * @mem_bidi_in: SGL style memory for TCM BIDI READ 2173 * @sg_mem_bidi_num: Number of BIDI READ SGL elements 2174 * 2175 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage 2176 * of parameters. 2177 */ 2178 int transport_generic_map_mem_to_cmd( 2179 struct se_cmd *cmd, 2180 struct scatterlist *sgl, 2181 u32 sgl_count, 2182 struct scatterlist *sgl_bidi, 2183 u32 sgl_bidi_count) 2184 { 2185 if (!sgl || !sgl_count) 2186 return 0; 2187 2188 /* 2189 * Reject SCSI data overflow with map_mem_to_cmd() as incoming 2190 * scatterlists already have been set to follow what the fabric 2191 * passes for the original expected data transfer length. 2192 */ 2193 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { 2194 pr_warn("Rejecting SCSI DATA overflow for fabric using" 2195 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); 2196 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 2197 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; 2198 return -EINVAL; 2199 } 2200 2201 cmd->t_data_sg = sgl; 2202 cmd->t_data_nents = sgl_count; 2203 2204 if (sgl_bidi && sgl_bidi_count) { 2205 cmd->t_bidi_data_sg = sgl_bidi; 2206 cmd->t_bidi_data_nents = sgl_bidi_count; 2207 } 2208 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 2209 return 0; 2210 } 2211 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); 2212 2213 void *transport_kmap_data_sg(struct se_cmd *cmd) 2214 { 2215 struct scatterlist *sg = cmd->t_data_sg; 2216 struct page **pages; 2217 int i; 2218 2219 BUG_ON(!sg); 2220 /* 2221 * We need to take into account a possible offset here for fabrics like 2222 * tcm_loop who may be using a contig buffer from the SCSI midlayer for 2223 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() 2224 */ 2225 if (!cmd->t_data_nents) 2226 return NULL; 2227 else if (cmd->t_data_nents == 1) 2228 return kmap(sg_page(sg)) + sg->offset; 2229 2230 /* >1 page. use vmap */ 2231 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); 2232 if (!pages) 2233 return NULL; 2234 2235 /* convert sg[] to pages[] */ 2236 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { 2237 pages[i] = sg_page(sg); 2238 } 2239 2240 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); 2241 kfree(pages); 2242 if (!cmd->t_data_vmap) 2243 return NULL; 2244 2245 return cmd->t_data_vmap + cmd->t_data_sg[0].offset; 2246 } 2247 EXPORT_SYMBOL(transport_kmap_data_sg); 2248 2249 void transport_kunmap_data_sg(struct se_cmd *cmd) 2250 { 2251 if (!cmd->t_data_nents) { 2252 return; 2253 } else if (cmd->t_data_nents == 1) { 2254 kunmap(sg_page(cmd->t_data_sg)); 2255 return; 2256 } 2257 2258 vunmap(cmd->t_data_vmap); 2259 cmd->t_data_vmap = NULL; 2260 } 2261 EXPORT_SYMBOL(transport_kunmap_data_sg); 2262 2263 static int 2264 transport_generic_get_mem(struct se_cmd *cmd) 2265 { 2266 u32 length = cmd->data_length; 2267 unsigned int nents; 2268 struct page *page; 2269 gfp_t zero_flag; 2270 int i = 0; 2271 2272 nents = DIV_ROUND_UP(length, PAGE_SIZE); 2273 cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL); 2274 if (!cmd->t_data_sg) 2275 return -ENOMEM; 2276 2277 cmd->t_data_nents = nents; 2278 sg_init_table(cmd->t_data_sg, nents); 2279 2280 zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO; 2281 2282 while (length) { 2283 u32 page_len = min_t(u32, length, PAGE_SIZE); 2284 page = alloc_page(GFP_KERNEL | zero_flag); 2285 if (!page) 2286 goto out; 2287 2288 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0); 2289 length -= page_len; 2290 i++; 2291 } 2292 return 0; 2293 2294 out: 2295 while (i > 0) { 2296 i--; 2297 __free_page(sg_page(&cmd->t_data_sg[i])); 2298 } 2299 kfree(cmd->t_data_sg); 2300 cmd->t_data_sg = NULL; 2301 return -ENOMEM; 2302 } 2303 2304 /* 2305 * Allocate any required resources to execute the command. For writes we 2306 * might not have the payload yet, so notify the fabric via a call to 2307 * ->write_pending instead. Otherwise place it on the execution queue. 2308 */ 2309 int transport_generic_new_cmd(struct se_cmd *cmd) 2310 { 2311 int ret = 0; 2312 2313 /* 2314 * Determine is the TCM fabric module has already allocated physical 2315 * memory, and is directly calling transport_generic_map_mem_to_cmd() 2316 * beforehand. 2317 */ 2318 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && 2319 cmd->data_length) { 2320 ret = transport_generic_get_mem(cmd); 2321 if (ret < 0) 2322 goto out_fail; 2323 } 2324 /* 2325 * If this command doesn't have any payload and we don't have to call 2326 * into the fabric for data transfers, go ahead and complete it right 2327 * away. 2328 */ 2329 if (!cmd->data_length) { 2330 spin_lock_irq(&cmd->t_state_lock); 2331 cmd->t_state = TRANSPORT_COMPLETE; 2332 cmd->transport_state |= CMD_T_ACTIVE; 2333 spin_unlock_irq(&cmd->t_state_lock); 2334 2335 if (cmd->t_task_cdb[0] == REQUEST_SENSE) { 2336 u8 ua_asc = 0, ua_ascq = 0; 2337 2338 core_scsi3_ua_clear_for_request_sense(cmd, 2339 &ua_asc, &ua_ascq); 2340 } 2341 2342 INIT_WORK(&cmd->work, target_complete_ok_work); 2343 queue_work(target_completion_wq, &cmd->work); 2344 return 0; 2345 } 2346 2347 atomic_inc(&cmd->t_fe_count); 2348 2349 /* 2350 * If this command is not a write we can execute it right here, 2351 * for write buffers we need to notify the fabric driver first 2352 * and let it call back once the write buffers are ready. 2353 */ 2354 target_add_to_state_list(cmd); 2355 if (cmd->data_direction != DMA_TO_DEVICE) { 2356 target_execute_cmd(cmd); 2357 return 0; 2358 } 2359 2360 spin_lock_irq(&cmd->t_state_lock); 2361 cmd->t_state = TRANSPORT_WRITE_PENDING; 2362 spin_unlock_irq(&cmd->t_state_lock); 2363 2364 transport_cmd_check_stop(cmd, false); 2365 2366 ret = cmd->se_tfo->write_pending(cmd); 2367 if (ret == -EAGAIN || ret == -ENOMEM) 2368 goto queue_full; 2369 2370 if (ret < 0) 2371 return ret; 2372 return 1; 2373 2374 out_fail: 2375 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; 2376 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2377 return -EINVAL; 2378 queue_full: 2379 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); 2380 cmd->t_state = TRANSPORT_COMPLETE_QF_WP; 2381 transport_handle_queue_full(cmd, cmd->se_dev); 2382 return 0; 2383 } 2384 EXPORT_SYMBOL(transport_generic_new_cmd); 2385 2386 static void transport_write_pending_qf(struct se_cmd *cmd) 2387 { 2388 int ret; 2389 2390 ret = cmd->se_tfo->write_pending(cmd); 2391 if (ret == -EAGAIN || ret == -ENOMEM) { 2392 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", 2393 cmd); 2394 transport_handle_queue_full(cmd, cmd->se_dev); 2395 } 2396 } 2397 2398 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) 2399 { 2400 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { 2401 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 2402 transport_wait_for_tasks(cmd); 2403 2404 transport_release_cmd(cmd); 2405 } else { 2406 if (wait_for_tasks) 2407 transport_wait_for_tasks(cmd); 2408 2409 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); 2410 2411 if (cmd->se_lun) 2412 transport_lun_remove_cmd(cmd); 2413 2414 transport_put_cmd(cmd); 2415 } 2416 } 2417 EXPORT_SYMBOL(transport_generic_free_cmd); 2418 2419 /* target_get_sess_cmd - Add command to active ->sess_cmd_list 2420 * @se_sess: session to reference 2421 * @se_cmd: command descriptor to add 2422 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() 2423 */ 2424 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, 2425 bool ack_kref) 2426 { 2427 unsigned long flags; 2428 int ret = 0; 2429 2430 kref_init(&se_cmd->cmd_kref); 2431 /* 2432 * Add a second kref if the fabric caller is expecting to handle 2433 * fabric acknowledgement that requires two target_put_sess_cmd() 2434 * invocations before se_cmd descriptor release. 2435 */ 2436 if (ack_kref == true) { 2437 kref_get(&se_cmd->cmd_kref); 2438 se_cmd->se_cmd_flags |= SCF_ACK_KREF; 2439 } 2440 2441 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2442 if (se_sess->sess_tearing_down) { 2443 ret = -ESHUTDOWN; 2444 goto out; 2445 } 2446 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); 2447 se_cmd->check_release = 1; 2448 2449 out: 2450 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2451 return ret; 2452 } 2453 2454 static void target_release_cmd_kref(struct kref *kref) 2455 { 2456 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); 2457 struct se_session *se_sess = se_cmd->se_sess; 2458 unsigned long flags; 2459 2460 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2461 if (list_empty(&se_cmd->se_cmd_list)) { 2462 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2463 se_cmd->se_tfo->release_cmd(se_cmd); 2464 return; 2465 } 2466 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { 2467 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2468 complete(&se_cmd->cmd_wait_comp); 2469 return; 2470 } 2471 list_del(&se_cmd->se_cmd_list); 2472 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2473 2474 se_cmd->se_tfo->release_cmd(se_cmd); 2475 } 2476 2477 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put 2478 * @se_sess: session to reference 2479 * @se_cmd: command descriptor to drop 2480 */ 2481 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) 2482 { 2483 return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref); 2484 } 2485 EXPORT_SYMBOL(target_put_sess_cmd); 2486 2487 /* target_sess_cmd_list_set_waiting - Flag all commands in 2488 * sess_cmd_list to complete cmd_wait_comp. Set 2489 * sess_tearing_down so no more commands are queued. 2490 * @se_sess: session to flag 2491 */ 2492 void target_sess_cmd_list_set_waiting(struct se_session *se_sess) 2493 { 2494 struct se_cmd *se_cmd; 2495 unsigned long flags; 2496 2497 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2498 2499 WARN_ON(se_sess->sess_tearing_down); 2500 se_sess->sess_tearing_down = 1; 2501 2502 list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) 2503 se_cmd->cmd_wait_set = 1; 2504 2505 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2506 } 2507 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); 2508 2509 /* target_wait_for_sess_cmds - Wait for outstanding descriptors 2510 * @se_sess: session to wait for active I/O 2511 * @wait_for_tasks: Make extra transport_wait_for_tasks call 2512 */ 2513 void target_wait_for_sess_cmds( 2514 struct se_session *se_sess, 2515 int wait_for_tasks) 2516 { 2517 struct se_cmd *se_cmd, *tmp_cmd; 2518 bool rc = false; 2519 2520 list_for_each_entry_safe(se_cmd, tmp_cmd, 2521 &se_sess->sess_cmd_list, se_cmd_list) { 2522 list_del(&se_cmd->se_cmd_list); 2523 2524 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" 2525 " %d\n", se_cmd, se_cmd->t_state, 2526 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2527 2528 if (wait_for_tasks) { 2529 pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d," 2530 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2531 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2532 2533 rc = transport_wait_for_tasks(se_cmd); 2534 2535 pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d," 2536 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2537 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2538 } 2539 2540 if (!rc) { 2541 wait_for_completion(&se_cmd->cmd_wait_comp); 2542 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" 2543 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2544 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2545 } 2546 2547 se_cmd->se_tfo->release_cmd(se_cmd); 2548 } 2549 } 2550 EXPORT_SYMBOL(target_wait_for_sess_cmds); 2551 2552 /* transport_lun_wait_for_tasks(): 2553 * 2554 * Called from ConfigFS context to stop the passed struct se_cmd to allow 2555 * an struct se_lun to be successfully shutdown. 2556 */ 2557 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) 2558 { 2559 unsigned long flags; 2560 int ret = 0; 2561 2562 /* 2563 * If the frontend has already requested this struct se_cmd to 2564 * be stopped, we can safely ignore this struct se_cmd. 2565 */ 2566 spin_lock_irqsave(&cmd->t_state_lock, flags); 2567 if (cmd->transport_state & CMD_T_STOP) { 2568 cmd->transport_state &= ~CMD_T_LUN_STOP; 2569 2570 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n", 2571 cmd->se_tfo->get_task_tag(cmd)); 2572 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2573 transport_cmd_check_stop(cmd, false); 2574 return -EPERM; 2575 } 2576 cmd->transport_state |= CMD_T_LUN_FE_STOP; 2577 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2578 2579 // XXX: audit task_flags checks. 2580 spin_lock_irqsave(&cmd->t_state_lock, flags); 2581 if ((cmd->transport_state & CMD_T_BUSY) && 2582 (cmd->transport_state & CMD_T_SENT)) { 2583 if (!target_stop_cmd(cmd, &flags)) 2584 ret++; 2585 } 2586 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2587 2588 pr_debug("ConfigFS: cmd: %p stop tasks ret:" 2589 " %d\n", cmd, ret); 2590 if (!ret) { 2591 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n", 2592 cmd->se_tfo->get_task_tag(cmd)); 2593 wait_for_completion(&cmd->transport_lun_stop_comp); 2594 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n", 2595 cmd->se_tfo->get_task_tag(cmd)); 2596 } 2597 2598 return 0; 2599 } 2600 2601 static void __transport_clear_lun_from_sessions(struct se_lun *lun) 2602 { 2603 struct se_cmd *cmd = NULL; 2604 unsigned long lun_flags, cmd_flags; 2605 /* 2606 * Do exception processing and return CHECK_CONDITION status to the 2607 * Initiator Port. 2608 */ 2609 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2610 while (!list_empty(&lun->lun_cmd_list)) { 2611 cmd = list_first_entry(&lun->lun_cmd_list, 2612 struct se_cmd, se_lun_node); 2613 list_del_init(&cmd->se_lun_node); 2614 2615 spin_lock(&cmd->t_state_lock); 2616 pr_debug("SE_LUN[%d] - Setting cmd->transport" 2617 "_lun_stop for ITT: 0x%08x\n", 2618 cmd->se_lun->unpacked_lun, 2619 cmd->se_tfo->get_task_tag(cmd)); 2620 cmd->transport_state |= CMD_T_LUN_STOP; 2621 spin_unlock(&cmd->t_state_lock); 2622 2623 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); 2624 2625 if (!cmd->se_lun) { 2626 pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n", 2627 cmd->se_tfo->get_task_tag(cmd), 2628 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); 2629 BUG(); 2630 } 2631 /* 2632 * If the Storage engine still owns the iscsi_cmd_t, determine 2633 * and/or stop its context. 2634 */ 2635 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport" 2636 "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun, 2637 cmd->se_tfo->get_task_tag(cmd)); 2638 2639 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) { 2640 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2641 continue; 2642 } 2643 2644 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun" 2645 "_wait_for_tasks(): SUCCESS\n", 2646 cmd->se_lun->unpacked_lun, 2647 cmd->se_tfo->get_task_tag(cmd)); 2648 2649 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); 2650 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) { 2651 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2652 goto check_cond; 2653 } 2654 cmd->transport_state &= ~CMD_T_DEV_ACTIVE; 2655 target_remove_from_state_list(cmd); 2656 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2657 2658 /* 2659 * The Storage engine stopped this struct se_cmd before it was 2660 * send to the fabric frontend for delivery back to the 2661 * Initiator Node. Return this SCSI CDB back with an 2662 * CHECK_CONDITION status. 2663 */ 2664 check_cond: 2665 transport_send_check_condition_and_sense(cmd, 2666 TCM_NON_EXISTENT_LUN, 0); 2667 /* 2668 * If the fabric frontend is waiting for this iscsi_cmd_t to 2669 * be released, notify the waiting thread now that LU has 2670 * finished accessing it. 2671 */ 2672 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags); 2673 if (cmd->transport_state & CMD_T_LUN_FE_STOP) { 2674 pr_debug("SE_LUN[%d] - Detected FE stop for" 2675 " struct se_cmd: %p ITT: 0x%08x\n", 2676 lun->unpacked_lun, 2677 cmd, cmd->se_tfo->get_task_tag(cmd)); 2678 2679 spin_unlock_irqrestore(&cmd->t_state_lock, 2680 cmd_flags); 2681 transport_cmd_check_stop(cmd, false); 2682 complete(&cmd->transport_lun_fe_stop_comp); 2683 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2684 continue; 2685 } 2686 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n", 2687 lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd)); 2688 2689 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags); 2690 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); 2691 } 2692 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); 2693 } 2694 2695 static int transport_clear_lun_thread(void *p) 2696 { 2697 struct se_lun *lun = p; 2698 2699 __transport_clear_lun_from_sessions(lun); 2700 complete(&lun->lun_shutdown_comp); 2701 2702 return 0; 2703 } 2704 2705 int transport_clear_lun_from_sessions(struct se_lun *lun) 2706 { 2707 struct task_struct *kt; 2708 2709 kt = kthread_run(transport_clear_lun_thread, lun, 2710 "tcm_cl_%u", lun->unpacked_lun); 2711 if (IS_ERR(kt)) { 2712 pr_err("Unable to start clear_lun thread\n"); 2713 return PTR_ERR(kt); 2714 } 2715 wait_for_completion(&lun->lun_shutdown_comp); 2716 2717 return 0; 2718 } 2719 2720 /** 2721 * transport_wait_for_tasks - wait for completion to occur 2722 * @cmd: command to wait 2723 * 2724 * Called from frontend fabric context to wait for storage engine 2725 * to pause and/or release frontend generated struct se_cmd. 2726 */ 2727 bool transport_wait_for_tasks(struct se_cmd *cmd) 2728 { 2729 unsigned long flags; 2730 2731 spin_lock_irqsave(&cmd->t_state_lock, flags); 2732 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && 2733 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2734 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2735 return false; 2736 } 2737 2738 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && 2739 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2740 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2741 return false; 2742 } 2743 /* 2744 * If we are already stopped due to an external event (ie: LUN shutdown) 2745 * sleep until the connection can have the passed struct se_cmd back. 2746 * The cmd->transport_lun_stopped_sem will be upped by 2747 * transport_clear_lun_from_sessions() once the ConfigFS context caller 2748 * has completed its operation on the struct se_cmd. 2749 */ 2750 if (cmd->transport_state & CMD_T_LUN_STOP) { 2751 pr_debug("wait_for_tasks: Stopping" 2752 " wait_for_completion(&cmd->t_tasktransport_lun_fe" 2753 "_stop_comp); for ITT: 0x%08x\n", 2754 cmd->se_tfo->get_task_tag(cmd)); 2755 /* 2756 * There is a special case for WRITES where a FE exception + 2757 * LUN shutdown means ConfigFS context is still sleeping on 2758 * transport_lun_stop_comp in transport_lun_wait_for_tasks(). 2759 * We go ahead and up transport_lun_stop_comp just to be sure 2760 * here. 2761 */ 2762 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2763 complete(&cmd->transport_lun_stop_comp); 2764 wait_for_completion(&cmd->transport_lun_fe_stop_comp); 2765 spin_lock_irqsave(&cmd->t_state_lock, flags); 2766 2767 target_remove_from_state_list(cmd); 2768 /* 2769 * At this point, the frontend who was the originator of this 2770 * struct se_cmd, now owns the structure and can be released through 2771 * normal means below. 2772 */ 2773 pr_debug("wait_for_tasks: Stopped" 2774 " wait_for_completion(&cmd->t_tasktransport_lun_fe_" 2775 "stop_comp); for ITT: 0x%08x\n", 2776 cmd->se_tfo->get_task_tag(cmd)); 2777 2778 cmd->transport_state &= ~CMD_T_LUN_STOP; 2779 } 2780 2781 if (!(cmd->transport_state & CMD_T_ACTIVE)) { 2782 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2783 return false; 2784 } 2785 2786 cmd->transport_state |= CMD_T_STOP; 2787 2788 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" 2789 " i_state: %d, t_state: %d, CMD_T_STOP\n", 2790 cmd, cmd->se_tfo->get_task_tag(cmd), 2791 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); 2792 2793 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2794 2795 wait_for_completion(&cmd->t_transport_stop_comp); 2796 2797 spin_lock_irqsave(&cmd->t_state_lock, flags); 2798 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); 2799 2800 pr_debug("wait_for_tasks: Stopped wait_for_compltion(" 2801 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", 2802 cmd->se_tfo->get_task_tag(cmd)); 2803 2804 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2805 2806 return true; 2807 } 2808 EXPORT_SYMBOL(transport_wait_for_tasks); 2809 2810 static int transport_get_sense_codes( 2811 struct se_cmd *cmd, 2812 u8 *asc, 2813 u8 *ascq) 2814 { 2815 *asc = cmd->scsi_asc; 2816 *ascq = cmd->scsi_ascq; 2817 2818 return 0; 2819 } 2820 2821 static int transport_set_sense_codes( 2822 struct se_cmd *cmd, 2823 u8 asc, 2824 u8 ascq) 2825 { 2826 cmd->scsi_asc = asc; 2827 cmd->scsi_ascq = ascq; 2828 2829 return 0; 2830 } 2831 2832 int transport_send_check_condition_and_sense( 2833 struct se_cmd *cmd, 2834 u8 reason, 2835 int from_transport) 2836 { 2837 unsigned char *buffer = cmd->sense_buffer; 2838 unsigned long flags; 2839 int offset; 2840 u8 asc = 0, ascq = 0; 2841 2842 spin_lock_irqsave(&cmd->t_state_lock, flags); 2843 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 2844 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2845 return 0; 2846 } 2847 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; 2848 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2849 2850 if (!reason && from_transport) 2851 goto after_reason; 2852 2853 if (!from_transport) 2854 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; 2855 /* 2856 * Data Segment and SenseLength of the fabric response PDU. 2857 * 2858 * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE 2859 * from include/scsi/scsi_cmnd.h 2860 */ 2861 offset = cmd->se_tfo->set_fabric_sense_len(cmd, 2862 TRANSPORT_SENSE_BUFFER); 2863 /* 2864 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses 2865 * SENSE KEY values from include/scsi/scsi.h 2866 */ 2867 switch (reason) { 2868 case TCM_NON_EXISTENT_LUN: 2869 /* CURRENT ERROR */ 2870 buffer[offset] = 0x70; 2871 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2872 /* ILLEGAL REQUEST */ 2873 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2874 /* LOGICAL UNIT NOT SUPPORTED */ 2875 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25; 2876 break; 2877 case TCM_UNSUPPORTED_SCSI_OPCODE: 2878 case TCM_SECTOR_COUNT_TOO_MANY: 2879 /* CURRENT ERROR */ 2880 buffer[offset] = 0x70; 2881 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2882 /* ILLEGAL REQUEST */ 2883 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2884 /* INVALID COMMAND OPERATION CODE */ 2885 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; 2886 break; 2887 case TCM_UNKNOWN_MODE_PAGE: 2888 /* CURRENT ERROR */ 2889 buffer[offset] = 0x70; 2890 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2891 /* ILLEGAL REQUEST */ 2892 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2893 /* INVALID FIELD IN CDB */ 2894 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; 2895 break; 2896 case TCM_CHECK_CONDITION_ABORT_CMD: 2897 /* CURRENT ERROR */ 2898 buffer[offset] = 0x70; 2899 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2900 /* ABORTED COMMAND */ 2901 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2902 /* BUS DEVICE RESET FUNCTION OCCURRED */ 2903 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; 2904 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; 2905 break; 2906 case TCM_INCORRECT_AMOUNT_OF_DATA: 2907 /* CURRENT ERROR */ 2908 buffer[offset] = 0x70; 2909 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2910 /* ABORTED COMMAND */ 2911 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2912 /* WRITE ERROR */ 2913 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; 2914 /* NOT ENOUGH UNSOLICITED DATA */ 2915 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; 2916 break; 2917 case TCM_INVALID_CDB_FIELD: 2918 /* CURRENT ERROR */ 2919 buffer[offset] = 0x70; 2920 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2921 /* ILLEGAL REQUEST */ 2922 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2923 /* INVALID FIELD IN CDB */ 2924 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; 2925 break; 2926 case TCM_INVALID_PARAMETER_LIST: 2927 /* CURRENT ERROR */ 2928 buffer[offset] = 0x70; 2929 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2930 /* ILLEGAL REQUEST */ 2931 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2932 /* INVALID FIELD IN PARAMETER LIST */ 2933 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; 2934 break; 2935 case TCM_UNEXPECTED_UNSOLICITED_DATA: 2936 /* CURRENT ERROR */ 2937 buffer[offset] = 0x70; 2938 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2939 /* ABORTED COMMAND */ 2940 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2941 /* WRITE ERROR */ 2942 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; 2943 /* UNEXPECTED_UNSOLICITED_DATA */ 2944 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; 2945 break; 2946 case TCM_SERVICE_CRC_ERROR: 2947 /* CURRENT ERROR */ 2948 buffer[offset] = 0x70; 2949 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2950 /* ABORTED COMMAND */ 2951 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2952 /* PROTOCOL SERVICE CRC ERROR */ 2953 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; 2954 /* N/A */ 2955 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; 2956 break; 2957 case TCM_SNACK_REJECTED: 2958 /* CURRENT ERROR */ 2959 buffer[offset] = 0x70; 2960 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2961 /* ABORTED COMMAND */ 2962 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2963 /* READ ERROR */ 2964 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; 2965 /* FAILED RETRANSMISSION REQUEST */ 2966 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; 2967 break; 2968 case TCM_WRITE_PROTECTED: 2969 /* CURRENT ERROR */ 2970 buffer[offset] = 0x70; 2971 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2972 /* DATA PROTECT */ 2973 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; 2974 /* WRITE PROTECTED */ 2975 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; 2976 break; 2977 case TCM_ADDRESS_OUT_OF_RANGE: 2978 /* CURRENT ERROR */ 2979 buffer[offset] = 0x70; 2980 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2981 /* ILLEGAL REQUEST */ 2982 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2983 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ 2984 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21; 2985 break; 2986 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 2987 /* CURRENT ERROR */ 2988 buffer[offset] = 0x70; 2989 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 2990 /* UNIT ATTENTION */ 2991 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; 2992 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); 2993 buffer[offset+SPC_ASC_KEY_OFFSET] = asc; 2994 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; 2995 break; 2996 case TCM_CHECK_CONDITION_NOT_READY: 2997 /* CURRENT ERROR */ 2998 buffer[offset] = 0x70; 2999 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 3000 /* Not Ready */ 3001 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; 3002 transport_get_sense_codes(cmd, &asc, &ascq); 3003 buffer[offset+SPC_ASC_KEY_OFFSET] = asc; 3004 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; 3005 break; 3006 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 3007 default: 3008 /* CURRENT ERROR */ 3009 buffer[offset] = 0x70; 3010 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10; 3011 /* ILLEGAL REQUEST */ 3012 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 3013 /* LOGICAL UNIT COMMUNICATION FAILURE */ 3014 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; 3015 break; 3016 } 3017 /* 3018 * This code uses linux/include/scsi/scsi.h SAM status codes! 3019 */ 3020 cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 3021 /* 3022 * Automatically padded, this value is encoded in the fabric's 3023 * data_length response PDU containing the SCSI defined sense data. 3024 */ 3025 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; 3026 3027 after_reason: 3028 return cmd->se_tfo->queue_status(cmd); 3029 } 3030 EXPORT_SYMBOL(transport_send_check_condition_and_sense); 3031 3032 int transport_check_aborted_status(struct se_cmd *cmd, int send_status) 3033 { 3034 int ret = 0; 3035 3036 if (cmd->transport_state & CMD_T_ABORTED) { 3037 if (!send_status || 3038 (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) 3039 return 1; 3040 3041 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED" 3042 " status for CDB: 0x%02x ITT: 0x%08x\n", 3043 cmd->t_task_cdb[0], 3044 cmd->se_tfo->get_task_tag(cmd)); 3045 3046 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; 3047 cmd->se_tfo->queue_status(cmd); 3048 ret = 1; 3049 } 3050 return ret; 3051 } 3052 EXPORT_SYMBOL(transport_check_aborted_status); 3053 3054 void transport_send_task_abort(struct se_cmd *cmd) 3055 { 3056 unsigned long flags; 3057 3058 spin_lock_irqsave(&cmd->t_state_lock, flags); 3059 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 3060 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3061 return; 3062 } 3063 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3064 3065 /* 3066 * If there are still expected incoming fabric WRITEs, we wait 3067 * until until they have completed before sending a TASK_ABORTED 3068 * response. This response with TASK_ABORTED status will be 3069 * queued back to fabric module by transport_check_aborted_status(). 3070 */ 3071 if (cmd->data_direction == DMA_TO_DEVICE) { 3072 if (cmd->se_tfo->write_pending_status(cmd) != 0) { 3073 cmd->transport_state |= CMD_T_ABORTED; 3074 smp_mb__after_atomic_inc(); 3075 } 3076 } 3077 cmd->scsi_status = SAM_STAT_TASK_ABORTED; 3078 3079 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," 3080 " ITT: 0x%08x\n", cmd->t_task_cdb[0], 3081 cmd->se_tfo->get_task_tag(cmd)); 3082 3083 cmd->se_tfo->queue_status(cmd); 3084 } 3085 3086 static void target_tmr_work(struct work_struct *work) 3087 { 3088 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 3089 struct se_device *dev = cmd->se_dev; 3090 struct se_tmr_req *tmr = cmd->se_tmr_req; 3091 int ret; 3092 3093 switch (tmr->function) { 3094 case TMR_ABORT_TASK: 3095 core_tmr_abort_task(dev, tmr, cmd->se_sess); 3096 break; 3097 case TMR_ABORT_TASK_SET: 3098 case TMR_CLEAR_ACA: 3099 case TMR_CLEAR_TASK_SET: 3100 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; 3101 break; 3102 case TMR_LUN_RESET: 3103 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); 3104 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : 3105 TMR_FUNCTION_REJECTED; 3106 break; 3107 case TMR_TARGET_WARM_RESET: 3108 tmr->response = TMR_FUNCTION_REJECTED; 3109 break; 3110 case TMR_TARGET_COLD_RESET: 3111 tmr->response = TMR_FUNCTION_REJECTED; 3112 break; 3113 default: 3114 pr_err("Uknown TMR function: 0x%02x.\n", 3115 tmr->function); 3116 tmr->response = TMR_FUNCTION_REJECTED; 3117 break; 3118 } 3119 3120 cmd->t_state = TRANSPORT_ISTATE_PROCESSING; 3121 cmd->se_tfo->queue_tm_rsp(cmd); 3122 3123 transport_cmd_check_stop_to_fabric(cmd); 3124 } 3125 3126 int transport_generic_handle_tmr( 3127 struct se_cmd *cmd) 3128 { 3129 INIT_WORK(&cmd->work, target_tmr_work); 3130 queue_work(cmd->se_dev->tmr_wq, &cmd->work); 3131 return 0; 3132 } 3133 EXPORT_SYMBOL(transport_generic_handle_tmr); 3134