1 /******************************************************************************* 2 * Filename: target_core_transport.c 3 * 4 * This file contains the Generic Target Engine Core. 5 * 6 * (c) Copyright 2002-2013 Datera, Inc. 7 * 8 * Nicholas A. Bellinger <nab@kernel.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 ******************************************************************************/ 25 26 #include <linux/net.h> 27 #include <linux/delay.h> 28 #include <linux/string.h> 29 #include <linux/timer.h> 30 #include <linux/slab.h> 31 #include <linux/spinlock.h> 32 #include <linux/kthread.h> 33 #include <linux/in.h> 34 #include <linux/cdrom.h> 35 #include <linux/module.h> 36 #include <linux/ratelimit.h> 37 #include <asm/unaligned.h> 38 #include <net/sock.h> 39 #include <net/tcp.h> 40 #include <scsi/scsi_proto.h> 41 42 #include <target/target_core_base.h> 43 #include <target/target_core_backend.h> 44 #include <target/target_core_fabric.h> 45 #include <target/target_core_configfs.h> 46 47 #include "target_core_internal.h" 48 #include "target_core_alua.h" 49 #include "target_core_pr.h" 50 #include "target_core_ua.h" 51 52 #define CREATE_TRACE_POINTS 53 #include <trace/events/target.h> 54 55 static struct workqueue_struct *target_completion_wq; 56 static struct kmem_cache *se_sess_cache; 57 struct kmem_cache *se_ua_cache; 58 struct kmem_cache *t10_pr_reg_cache; 59 struct kmem_cache *t10_alua_lu_gp_cache; 60 struct kmem_cache *t10_alua_lu_gp_mem_cache; 61 struct kmem_cache *t10_alua_tg_pt_gp_cache; 62 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; 63 struct kmem_cache *t10_alua_lba_map_cache; 64 struct kmem_cache *t10_alua_lba_map_mem_cache; 65 66 static void transport_complete_task_attr(struct se_cmd *cmd); 67 static void transport_handle_queue_full(struct se_cmd *cmd, 68 struct se_device *dev); 69 static int transport_put_cmd(struct se_cmd *cmd); 70 static void target_complete_ok_work(struct work_struct *work); 71 72 int init_se_kmem_caches(void) 73 { 74 se_sess_cache = kmem_cache_create("se_sess_cache", 75 sizeof(struct se_session), __alignof__(struct se_session), 76 0, NULL); 77 if (!se_sess_cache) { 78 pr_err("kmem_cache_create() for struct se_session" 79 " failed\n"); 80 goto out; 81 } 82 se_ua_cache = kmem_cache_create("se_ua_cache", 83 sizeof(struct se_ua), __alignof__(struct se_ua), 84 0, NULL); 85 if (!se_ua_cache) { 86 pr_err("kmem_cache_create() for struct se_ua failed\n"); 87 goto out_free_sess_cache; 88 } 89 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", 90 sizeof(struct t10_pr_registration), 91 __alignof__(struct t10_pr_registration), 0, NULL); 92 if (!t10_pr_reg_cache) { 93 pr_err("kmem_cache_create() for struct t10_pr_registration" 94 " failed\n"); 95 goto out_free_ua_cache; 96 } 97 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", 98 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), 99 0, NULL); 100 if (!t10_alua_lu_gp_cache) { 101 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache" 102 " failed\n"); 103 goto out_free_pr_reg_cache; 104 } 105 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", 106 sizeof(struct t10_alua_lu_gp_member), 107 __alignof__(struct t10_alua_lu_gp_member), 0, NULL); 108 if (!t10_alua_lu_gp_mem_cache) { 109 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_" 110 "cache failed\n"); 111 goto out_free_lu_gp_cache; 112 } 113 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", 114 sizeof(struct t10_alua_tg_pt_gp), 115 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); 116 if (!t10_alua_tg_pt_gp_cache) { 117 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" 118 "cache failed\n"); 119 goto out_free_lu_gp_mem_cache; 120 } 121 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( 122 "t10_alua_tg_pt_gp_mem_cache", 123 sizeof(struct t10_alua_tg_pt_gp_member), 124 __alignof__(struct t10_alua_tg_pt_gp_member), 125 0, NULL); 126 if (!t10_alua_tg_pt_gp_mem_cache) { 127 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_" 128 "mem_t failed\n"); 129 goto out_free_tg_pt_gp_cache; 130 } 131 t10_alua_lba_map_cache = kmem_cache_create( 132 "t10_alua_lba_map_cache", 133 sizeof(struct t10_alua_lba_map), 134 __alignof__(struct t10_alua_lba_map), 0, NULL); 135 if (!t10_alua_lba_map_cache) { 136 pr_err("kmem_cache_create() for t10_alua_lba_map_" 137 "cache failed\n"); 138 goto out_free_tg_pt_gp_mem_cache; 139 } 140 t10_alua_lba_map_mem_cache = kmem_cache_create( 141 "t10_alua_lba_map_mem_cache", 142 sizeof(struct t10_alua_lba_map_member), 143 __alignof__(struct t10_alua_lba_map_member), 0, NULL); 144 if (!t10_alua_lba_map_mem_cache) { 145 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_" 146 "cache failed\n"); 147 goto out_free_lba_map_cache; 148 } 149 150 target_completion_wq = alloc_workqueue("target_completion", 151 WQ_MEM_RECLAIM, 0); 152 if (!target_completion_wq) 153 goto out_free_lba_map_mem_cache; 154 155 return 0; 156 157 out_free_lba_map_mem_cache: 158 kmem_cache_destroy(t10_alua_lba_map_mem_cache); 159 out_free_lba_map_cache: 160 kmem_cache_destroy(t10_alua_lba_map_cache); 161 out_free_tg_pt_gp_mem_cache: 162 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); 163 out_free_tg_pt_gp_cache: 164 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 165 out_free_lu_gp_mem_cache: 166 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 167 out_free_lu_gp_cache: 168 kmem_cache_destroy(t10_alua_lu_gp_cache); 169 out_free_pr_reg_cache: 170 kmem_cache_destroy(t10_pr_reg_cache); 171 out_free_ua_cache: 172 kmem_cache_destroy(se_ua_cache); 173 out_free_sess_cache: 174 kmem_cache_destroy(se_sess_cache); 175 out: 176 return -ENOMEM; 177 } 178 179 void release_se_kmem_caches(void) 180 { 181 destroy_workqueue(target_completion_wq); 182 kmem_cache_destroy(se_sess_cache); 183 kmem_cache_destroy(se_ua_cache); 184 kmem_cache_destroy(t10_pr_reg_cache); 185 kmem_cache_destroy(t10_alua_lu_gp_cache); 186 kmem_cache_destroy(t10_alua_lu_gp_mem_cache); 187 kmem_cache_destroy(t10_alua_tg_pt_gp_cache); 188 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); 189 kmem_cache_destroy(t10_alua_lba_map_cache); 190 kmem_cache_destroy(t10_alua_lba_map_mem_cache); 191 } 192 193 /* This code ensures unique mib indexes are handed out. */ 194 static DEFINE_SPINLOCK(scsi_mib_index_lock); 195 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX]; 196 197 /* 198 * Allocate a new row index for the entry type specified 199 */ 200 u32 scsi_get_new_index(scsi_index_t type) 201 { 202 u32 new_index; 203 204 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)); 205 206 spin_lock(&scsi_mib_index_lock); 207 new_index = ++scsi_mib_index[type]; 208 spin_unlock(&scsi_mib_index_lock); 209 210 return new_index; 211 } 212 213 void transport_subsystem_check_init(void) 214 { 215 int ret; 216 static int sub_api_initialized; 217 218 if (sub_api_initialized) 219 return; 220 221 ret = request_module("target_core_iblock"); 222 if (ret != 0) 223 pr_err("Unable to load target_core_iblock\n"); 224 225 ret = request_module("target_core_file"); 226 if (ret != 0) 227 pr_err("Unable to load target_core_file\n"); 228 229 ret = request_module("target_core_pscsi"); 230 if (ret != 0) 231 pr_err("Unable to load target_core_pscsi\n"); 232 233 ret = request_module("target_core_user"); 234 if (ret != 0) 235 pr_err("Unable to load target_core_user\n"); 236 237 sub_api_initialized = 1; 238 } 239 240 struct se_session *transport_init_session(enum target_prot_op sup_prot_ops) 241 { 242 struct se_session *se_sess; 243 244 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); 245 if (!se_sess) { 246 pr_err("Unable to allocate struct se_session from" 247 " se_sess_cache\n"); 248 return ERR_PTR(-ENOMEM); 249 } 250 INIT_LIST_HEAD(&se_sess->sess_list); 251 INIT_LIST_HEAD(&se_sess->sess_acl_list); 252 INIT_LIST_HEAD(&se_sess->sess_cmd_list); 253 INIT_LIST_HEAD(&se_sess->sess_wait_list); 254 spin_lock_init(&se_sess->sess_cmd_lock); 255 kref_init(&se_sess->sess_kref); 256 se_sess->sup_prot_ops = sup_prot_ops; 257 258 return se_sess; 259 } 260 EXPORT_SYMBOL(transport_init_session); 261 262 int transport_alloc_session_tags(struct se_session *se_sess, 263 unsigned int tag_num, unsigned int tag_size) 264 { 265 int rc; 266 267 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, 268 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 269 if (!se_sess->sess_cmd_map) { 270 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size); 271 if (!se_sess->sess_cmd_map) { 272 pr_err("Unable to allocate se_sess->sess_cmd_map\n"); 273 return -ENOMEM; 274 } 275 } 276 277 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num); 278 if (rc < 0) { 279 pr_err("Unable to init se_sess->sess_tag_pool," 280 " tag_num: %u\n", tag_num); 281 if (is_vmalloc_addr(se_sess->sess_cmd_map)) 282 vfree(se_sess->sess_cmd_map); 283 else 284 kfree(se_sess->sess_cmd_map); 285 se_sess->sess_cmd_map = NULL; 286 return -ENOMEM; 287 } 288 289 return 0; 290 } 291 EXPORT_SYMBOL(transport_alloc_session_tags); 292 293 struct se_session *transport_init_session_tags(unsigned int tag_num, 294 unsigned int tag_size, 295 enum target_prot_op sup_prot_ops) 296 { 297 struct se_session *se_sess; 298 int rc; 299 300 se_sess = transport_init_session(sup_prot_ops); 301 if (IS_ERR(se_sess)) 302 return se_sess; 303 304 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size); 305 if (rc < 0) { 306 transport_free_session(se_sess); 307 return ERR_PTR(-ENOMEM); 308 } 309 310 return se_sess; 311 } 312 EXPORT_SYMBOL(transport_init_session_tags); 313 314 /* 315 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called. 316 */ 317 void __transport_register_session( 318 struct se_portal_group *se_tpg, 319 struct se_node_acl *se_nacl, 320 struct se_session *se_sess, 321 void *fabric_sess_ptr) 322 { 323 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo; 324 unsigned char buf[PR_REG_ISID_LEN]; 325 326 se_sess->se_tpg = se_tpg; 327 se_sess->fabric_sess_ptr = fabric_sess_ptr; 328 /* 329 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t 330 * 331 * Only set for struct se_session's that will actually be moving I/O. 332 * eg: *NOT* discovery sessions. 333 */ 334 if (se_nacl) { 335 /* 336 * 337 * Determine if fabric allows for T10-PI feature bits exposed to 338 * initiators for device backends with !dev->dev_attrib.pi_prot_type. 339 * 340 * If so, then always save prot_type on a per se_node_acl node 341 * basis and re-instate the previous sess_prot_type to avoid 342 * disabling PI from below any previously initiator side 343 * registered LUNs. 344 */ 345 if (se_nacl->saved_prot_type) 346 se_sess->sess_prot_type = se_nacl->saved_prot_type; 347 else if (tfo->tpg_check_prot_fabric_only) 348 se_sess->sess_prot_type = se_nacl->saved_prot_type = 349 tfo->tpg_check_prot_fabric_only(se_tpg); 350 /* 351 * If the fabric module supports an ISID based TransportID, 352 * save this value in binary from the fabric I_T Nexus now. 353 */ 354 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { 355 memset(&buf[0], 0, PR_REG_ISID_LEN); 356 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, 357 &buf[0], PR_REG_ISID_LEN); 358 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); 359 } 360 kref_get(&se_nacl->acl_kref); 361 362 spin_lock_irq(&se_nacl->nacl_sess_lock); 363 /* 364 * The se_nacl->nacl_sess pointer will be set to the 365 * last active I_T Nexus for each struct se_node_acl. 366 */ 367 se_nacl->nacl_sess = se_sess; 368 369 list_add_tail(&se_sess->sess_acl_list, 370 &se_nacl->acl_sess_list); 371 spin_unlock_irq(&se_nacl->nacl_sess_lock); 372 } 373 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); 374 375 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", 376 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr); 377 } 378 EXPORT_SYMBOL(__transport_register_session); 379 380 void transport_register_session( 381 struct se_portal_group *se_tpg, 382 struct se_node_acl *se_nacl, 383 struct se_session *se_sess, 384 void *fabric_sess_ptr) 385 { 386 unsigned long flags; 387 388 spin_lock_irqsave(&se_tpg->session_lock, flags); 389 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); 390 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 391 } 392 EXPORT_SYMBOL(transport_register_session); 393 394 static void target_release_session(struct kref *kref) 395 { 396 struct se_session *se_sess = container_of(kref, 397 struct se_session, sess_kref); 398 struct se_portal_group *se_tpg = se_sess->se_tpg; 399 400 se_tpg->se_tpg_tfo->close_session(se_sess); 401 } 402 403 void target_get_session(struct se_session *se_sess) 404 { 405 kref_get(&se_sess->sess_kref); 406 } 407 EXPORT_SYMBOL(target_get_session); 408 409 void target_put_session(struct se_session *se_sess) 410 { 411 struct se_portal_group *tpg = se_sess->se_tpg; 412 413 if (tpg->se_tpg_tfo->put_session != NULL) { 414 tpg->se_tpg_tfo->put_session(se_sess); 415 return; 416 } 417 kref_put(&se_sess->sess_kref, target_release_session); 418 } 419 EXPORT_SYMBOL(target_put_session); 420 421 ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page) 422 { 423 struct se_session *se_sess; 424 ssize_t len = 0; 425 426 spin_lock_bh(&se_tpg->session_lock); 427 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) { 428 if (!se_sess->se_node_acl) 429 continue; 430 if (!se_sess->se_node_acl->dynamic_node_acl) 431 continue; 432 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE) 433 break; 434 435 len += snprintf(page + len, PAGE_SIZE - len, "%s\n", 436 se_sess->se_node_acl->initiatorname); 437 len += 1; /* Include NULL terminator */ 438 } 439 spin_unlock_bh(&se_tpg->session_lock); 440 441 return len; 442 } 443 EXPORT_SYMBOL(target_show_dynamic_sessions); 444 445 static void target_complete_nacl(struct kref *kref) 446 { 447 struct se_node_acl *nacl = container_of(kref, 448 struct se_node_acl, acl_kref); 449 450 complete(&nacl->acl_free_comp); 451 } 452 453 void target_put_nacl(struct se_node_acl *nacl) 454 { 455 kref_put(&nacl->acl_kref, target_complete_nacl); 456 } 457 458 void transport_deregister_session_configfs(struct se_session *se_sess) 459 { 460 struct se_node_acl *se_nacl; 461 unsigned long flags; 462 /* 463 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session 464 */ 465 se_nacl = se_sess->se_node_acl; 466 if (se_nacl) { 467 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags); 468 if (se_nacl->acl_stop == 0) 469 list_del(&se_sess->sess_acl_list); 470 /* 471 * If the session list is empty, then clear the pointer. 472 * Otherwise, set the struct se_session pointer from the tail 473 * element of the per struct se_node_acl active session list. 474 */ 475 if (list_empty(&se_nacl->acl_sess_list)) 476 se_nacl->nacl_sess = NULL; 477 else { 478 se_nacl->nacl_sess = container_of( 479 se_nacl->acl_sess_list.prev, 480 struct se_session, sess_acl_list); 481 } 482 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags); 483 } 484 } 485 EXPORT_SYMBOL(transport_deregister_session_configfs); 486 487 void transport_free_session(struct se_session *se_sess) 488 { 489 if (se_sess->sess_cmd_map) { 490 percpu_ida_destroy(&se_sess->sess_tag_pool); 491 if (is_vmalloc_addr(se_sess->sess_cmd_map)) 492 vfree(se_sess->sess_cmd_map); 493 else 494 kfree(se_sess->sess_cmd_map); 495 } 496 kmem_cache_free(se_sess_cache, se_sess); 497 } 498 EXPORT_SYMBOL(transport_free_session); 499 500 void transport_deregister_session(struct se_session *se_sess) 501 { 502 struct se_portal_group *se_tpg = se_sess->se_tpg; 503 const struct target_core_fabric_ops *se_tfo; 504 struct se_node_acl *se_nacl; 505 unsigned long flags; 506 bool comp_nacl = true; 507 508 if (!se_tpg) { 509 transport_free_session(se_sess); 510 return; 511 } 512 se_tfo = se_tpg->se_tpg_tfo; 513 514 spin_lock_irqsave(&se_tpg->session_lock, flags); 515 list_del(&se_sess->sess_list); 516 se_sess->se_tpg = NULL; 517 se_sess->fabric_sess_ptr = NULL; 518 spin_unlock_irqrestore(&se_tpg->session_lock, flags); 519 520 /* 521 * Determine if we need to do extra work for this initiator node's 522 * struct se_node_acl if it had been previously dynamically generated. 523 */ 524 se_nacl = se_sess->se_node_acl; 525 526 spin_lock_irqsave(&se_tpg->acl_node_lock, flags); 527 if (se_nacl && se_nacl->dynamic_node_acl) { 528 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) { 529 list_del(&se_nacl->acl_list); 530 se_tpg->num_node_acls--; 531 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); 532 core_tpg_wait_for_nacl_pr_ref(se_nacl); 533 core_free_device_list_for_node(se_nacl, se_tpg); 534 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl); 535 536 comp_nacl = false; 537 spin_lock_irqsave(&se_tpg->acl_node_lock, flags); 538 } 539 } 540 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags); 541 542 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n", 543 se_tpg->se_tpg_tfo->get_fabric_name()); 544 /* 545 * If last kref is dropping now for an explicit NodeACL, awake sleeping 546 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group 547 * removal context. 548 */ 549 if (se_nacl && comp_nacl) 550 target_put_nacl(se_nacl); 551 552 transport_free_session(se_sess); 553 } 554 EXPORT_SYMBOL(transport_deregister_session); 555 556 /* 557 * Called with cmd->t_state_lock held. 558 */ 559 static void target_remove_from_state_list(struct se_cmd *cmd) 560 { 561 struct se_device *dev = cmd->se_dev; 562 unsigned long flags; 563 564 if (!dev) 565 return; 566 567 if (cmd->transport_state & CMD_T_BUSY) 568 return; 569 570 spin_lock_irqsave(&dev->execute_task_lock, flags); 571 if (cmd->state_active) { 572 list_del(&cmd->state_list); 573 cmd->state_active = false; 574 } 575 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 576 } 577 578 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, 579 bool write_pending) 580 { 581 unsigned long flags; 582 583 spin_lock_irqsave(&cmd->t_state_lock, flags); 584 if (write_pending) 585 cmd->t_state = TRANSPORT_WRITE_PENDING; 586 587 if (remove_from_lists) { 588 target_remove_from_state_list(cmd); 589 590 /* 591 * Clear struct se_cmd->se_lun before the handoff to FE. 592 */ 593 cmd->se_lun = NULL; 594 } 595 596 /* 597 * Determine if frontend context caller is requesting the stopping of 598 * this command for frontend exceptions. 599 */ 600 if (cmd->transport_state & CMD_T_STOP) { 601 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", 602 __func__, __LINE__, 603 cmd->se_tfo->get_task_tag(cmd)); 604 605 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 606 607 complete_all(&cmd->t_transport_stop_comp); 608 return 1; 609 } 610 611 cmd->transport_state &= ~CMD_T_ACTIVE; 612 if (remove_from_lists) { 613 /* 614 * Some fabric modules like tcm_loop can release 615 * their internally allocated I/O reference now and 616 * struct se_cmd now. 617 * 618 * Fabric modules are expected to return '1' here if the 619 * se_cmd being passed is released at this point, 620 * or zero if not being released. 621 */ 622 if (cmd->se_tfo->check_stop_free != NULL) { 623 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 624 return cmd->se_tfo->check_stop_free(cmd); 625 } 626 } 627 628 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 629 return 0; 630 } 631 632 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) 633 { 634 return transport_cmd_check_stop(cmd, true, false); 635 } 636 637 static void transport_lun_remove_cmd(struct se_cmd *cmd) 638 { 639 struct se_lun *lun = cmd->se_lun; 640 641 if (!lun) 642 return; 643 644 if (cmpxchg(&cmd->lun_ref_active, true, false)) 645 percpu_ref_put(&lun->lun_ref); 646 } 647 648 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) 649 { 650 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD) 651 transport_lun_remove_cmd(cmd); 652 /* 653 * Allow the fabric driver to unmap any resources before 654 * releasing the descriptor via TFO->release_cmd() 655 */ 656 if (remove) 657 cmd->se_tfo->aborted_task(cmd); 658 659 if (transport_cmd_check_stop_to_fabric(cmd)) 660 return; 661 if (remove) 662 transport_put_cmd(cmd); 663 } 664 665 static void target_complete_failure_work(struct work_struct *work) 666 { 667 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 668 669 transport_generic_request_failure(cmd, 670 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE); 671 } 672 673 /* 674 * Used when asking transport to copy Sense Data from the underlying 675 * Linux/SCSI struct scsi_cmnd 676 */ 677 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd) 678 { 679 struct se_device *dev = cmd->se_dev; 680 681 WARN_ON(!cmd->se_lun); 682 683 if (!dev) 684 return NULL; 685 686 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) 687 return NULL; 688 689 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; 690 691 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n", 692 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status); 693 return cmd->sense_buffer; 694 } 695 696 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) 697 { 698 struct se_device *dev = cmd->se_dev; 699 int success = scsi_status == GOOD; 700 unsigned long flags; 701 702 cmd->scsi_status = scsi_status; 703 704 705 spin_lock_irqsave(&cmd->t_state_lock, flags); 706 cmd->transport_state &= ~CMD_T_BUSY; 707 708 if (dev && dev->transport->transport_complete) { 709 dev->transport->transport_complete(cmd, 710 cmd->t_data_sg, 711 transport_get_sense_buffer(cmd)); 712 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) 713 success = 1; 714 } 715 716 /* 717 * See if we are waiting to complete for an exception condition. 718 */ 719 if (cmd->transport_state & CMD_T_REQUEST_STOP) { 720 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 721 complete(&cmd->task_stop_comp); 722 return; 723 } 724 725 /* 726 * Check for case where an explicit ABORT_TASK has been received 727 * and transport_wait_for_tasks() will be waiting for completion.. 728 */ 729 if (cmd->transport_state & CMD_T_ABORTED && 730 cmd->transport_state & CMD_T_STOP) { 731 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 732 complete_all(&cmd->t_transport_stop_comp); 733 return; 734 } else if (!success) { 735 INIT_WORK(&cmd->work, target_complete_failure_work); 736 } else { 737 INIT_WORK(&cmd->work, target_complete_ok_work); 738 } 739 740 cmd->t_state = TRANSPORT_COMPLETE; 741 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE); 742 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 743 744 queue_work(target_completion_wq, &cmd->work); 745 } 746 EXPORT_SYMBOL(target_complete_cmd); 747 748 void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) 749 { 750 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) { 751 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { 752 cmd->residual_count += cmd->data_length - length; 753 } else { 754 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 755 cmd->residual_count = cmd->data_length - length; 756 } 757 758 cmd->data_length = length; 759 } 760 761 target_complete_cmd(cmd, scsi_status); 762 } 763 EXPORT_SYMBOL(target_complete_cmd_with_length); 764 765 static void target_add_to_state_list(struct se_cmd *cmd) 766 { 767 struct se_device *dev = cmd->se_dev; 768 unsigned long flags; 769 770 spin_lock_irqsave(&dev->execute_task_lock, flags); 771 if (!cmd->state_active) { 772 list_add_tail(&cmd->state_list, &dev->state_list); 773 cmd->state_active = true; 774 } 775 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 776 } 777 778 /* 779 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status 780 */ 781 static void transport_write_pending_qf(struct se_cmd *cmd); 782 static void transport_complete_qf(struct se_cmd *cmd); 783 784 void target_qf_do_work(struct work_struct *work) 785 { 786 struct se_device *dev = container_of(work, struct se_device, 787 qf_work_queue); 788 LIST_HEAD(qf_cmd_list); 789 struct se_cmd *cmd, *cmd_tmp; 790 791 spin_lock_irq(&dev->qf_cmd_lock); 792 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list); 793 spin_unlock_irq(&dev->qf_cmd_lock); 794 795 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) { 796 list_del(&cmd->se_qf_node); 797 atomic_dec_mb(&dev->dev_qf_count); 798 799 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue" 800 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd, 801 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" : 802 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING" 803 : "UNKNOWN"); 804 805 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) 806 transport_write_pending_qf(cmd); 807 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) 808 transport_complete_qf(cmd); 809 } 810 } 811 812 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) 813 { 814 switch (cmd->data_direction) { 815 case DMA_NONE: 816 return "NONE"; 817 case DMA_FROM_DEVICE: 818 return "READ"; 819 case DMA_TO_DEVICE: 820 return "WRITE"; 821 case DMA_BIDIRECTIONAL: 822 return "BIDI"; 823 default: 824 break; 825 } 826 827 return "UNKNOWN"; 828 } 829 830 void transport_dump_dev_state( 831 struct se_device *dev, 832 char *b, 833 int *bl) 834 { 835 *bl += sprintf(b + *bl, "Status: "); 836 if (dev->export_count) 837 *bl += sprintf(b + *bl, "ACTIVATED"); 838 else 839 *bl += sprintf(b + *bl, "DEACTIVATED"); 840 841 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth); 842 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n", 843 dev->dev_attrib.block_size, 844 dev->dev_attrib.hw_max_sectors); 845 *bl += sprintf(b + *bl, " "); 846 } 847 848 void transport_dump_vpd_proto_id( 849 struct t10_vpd *vpd, 850 unsigned char *p_buf, 851 int p_buf_len) 852 { 853 unsigned char buf[VPD_TMP_BUF_SIZE]; 854 int len; 855 856 memset(buf, 0, VPD_TMP_BUF_SIZE); 857 len = sprintf(buf, "T10 VPD Protocol Identifier: "); 858 859 switch (vpd->protocol_identifier) { 860 case 0x00: 861 sprintf(buf+len, "Fibre Channel\n"); 862 break; 863 case 0x10: 864 sprintf(buf+len, "Parallel SCSI\n"); 865 break; 866 case 0x20: 867 sprintf(buf+len, "SSA\n"); 868 break; 869 case 0x30: 870 sprintf(buf+len, "IEEE 1394\n"); 871 break; 872 case 0x40: 873 sprintf(buf+len, "SCSI Remote Direct Memory Access" 874 " Protocol\n"); 875 break; 876 case 0x50: 877 sprintf(buf+len, "Internet SCSI (iSCSI)\n"); 878 break; 879 case 0x60: 880 sprintf(buf+len, "SAS Serial SCSI Protocol\n"); 881 break; 882 case 0x70: 883 sprintf(buf+len, "Automation/Drive Interface Transport" 884 " Protocol\n"); 885 break; 886 case 0x80: 887 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); 888 break; 889 default: 890 sprintf(buf+len, "Unknown 0x%02x\n", 891 vpd->protocol_identifier); 892 break; 893 } 894 895 if (p_buf) 896 strncpy(p_buf, buf, p_buf_len); 897 else 898 pr_debug("%s", buf); 899 } 900 901 void 902 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) 903 { 904 /* 905 * Check if the Protocol Identifier Valid (PIV) bit is set.. 906 * 907 * from spc3r23.pdf section 7.5.1 908 */ 909 if (page_83[1] & 0x80) { 910 vpd->protocol_identifier = (page_83[0] & 0xf0); 911 vpd->protocol_identifier_set = 1; 912 transport_dump_vpd_proto_id(vpd, NULL, 0); 913 } 914 } 915 EXPORT_SYMBOL(transport_set_vpd_proto_id); 916 917 int transport_dump_vpd_assoc( 918 struct t10_vpd *vpd, 919 unsigned char *p_buf, 920 int p_buf_len) 921 { 922 unsigned char buf[VPD_TMP_BUF_SIZE]; 923 int ret = 0; 924 int len; 925 926 memset(buf, 0, VPD_TMP_BUF_SIZE); 927 len = sprintf(buf, "T10 VPD Identifier Association: "); 928 929 switch (vpd->association) { 930 case 0x00: 931 sprintf(buf+len, "addressed logical unit\n"); 932 break; 933 case 0x10: 934 sprintf(buf+len, "target port\n"); 935 break; 936 case 0x20: 937 sprintf(buf+len, "SCSI target device\n"); 938 break; 939 default: 940 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); 941 ret = -EINVAL; 942 break; 943 } 944 945 if (p_buf) 946 strncpy(p_buf, buf, p_buf_len); 947 else 948 pr_debug("%s", buf); 949 950 return ret; 951 } 952 953 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) 954 { 955 /* 956 * The VPD identification association.. 957 * 958 * from spc3r23.pdf Section 7.6.3.1 Table 297 959 */ 960 vpd->association = (page_83[1] & 0x30); 961 return transport_dump_vpd_assoc(vpd, NULL, 0); 962 } 963 EXPORT_SYMBOL(transport_set_vpd_assoc); 964 965 int transport_dump_vpd_ident_type( 966 struct t10_vpd *vpd, 967 unsigned char *p_buf, 968 int p_buf_len) 969 { 970 unsigned char buf[VPD_TMP_BUF_SIZE]; 971 int ret = 0; 972 int len; 973 974 memset(buf, 0, VPD_TMP_BUF_SIZE); 975 len = sprintf(buf, "T10 VPD Identifier Type: "); 976 977 switch (vpd->device_identifier_type) { 978 case 0x00: 979 sprintf(buf+len, "Vendor specific\n"); 980 break; 981 case 0x01: 982 sprintf(buf+len, "T10 Vendor ID based\n"); 983 break; 984 case 0x02: 985 sprintf(buf+len, "EUI-64 based\n"); 986 break; 987 case 0x03: 988 sprintf(buf+len, "NAA\n"); 989 break; 990 case 0x04: 991 sprintf(buf+len, "Relative target port identifier\n"); 992 break; 993 case 0x08: 994 sprintf(buf+len, "SCSI name string\n"); 995 break; 996 default: 997 sprintf(buf+len, "Unsupported: 0x%02x\n", 998 vpd->device_identifier_type); 999 ret = -EINVAL; 1000 break; 1001 } 1002 1003 if (p_buf) { 1004 if (p_buf_len < strlen(buf)+1) 1005 return -EINVAL; 1006 strncpy(p_buf, buf, p_buf_len); 1007 } else { 1008 pr_debug("%s", buf); 1009 } 1010 1011 return ret; 1012 } 1013 1014 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) 1015 { 1016 /* 1017 * The VPD identifier type.. 1018 * 1019 * from spc3r23.pdf Section 7.6.3.1 Table 298 1020 */ 1021 vpd->device_identifier_type = (page_83[1] & 0x0f); 1022 return transport_dump_vpd_ident_type(vpd, NULL, 0); 1023 } 1024 EXPORT_SYMBOL(transport_set_vpd_ident_type); 1025 1026 int transport_dump_vpd_ident( 1027 struct t10_vpd *vpd, 1028 unsigned char *p_buf, 1029 int p_buf_len) 1030 { 1031 unsigned char buf[VPD_TMP_BUF_SIZE]; 1032 int ret = 0; 1033 1034 memset(buf, 0, VPD_TMP_BUF_SIZE); 1035 1036 switch (vpd->device_identifier_code_set) { 1037 case 0x01: /* Binary */ 1038 snprintf(buf, sizeof(buf), 1039 "T10 VPD Binary Device Identifier: %s\n", 1040 &vpd->device_identifier[0]); 1041 break; 1042 case 0x02: /* ASCII */ 1043 snprintf(buf, sizeof(buf), 1044 "T10 VPD ASCII Device Identifier: %s\n", 1045 &vpd->device_identifier[0]); 1046 break; 1047 case 0x03: /* UTF-8 */ 1048 snprintf(buf, sizeof(buf), 1049 "T10 VPD UTF-8 Device Identifier: %s\n", 1050 &vpd->device_identifier[0]); 1051 break; 1052 default: 1053 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" 1054 " 0x%02x", vpd->device_identifier_code_set); 1055 ret = -EINVAL; 1056 break; 1057 } 1058 1059 if (p_buf) 1060 strncpy(p_buf, buf, p_buf_len); 1061 else 1062 pr_debug("%s", buf); 1063 1064 return ret; 1065 } 1066 1067 int 1068 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) 1069 { 1070 static const char hex_str[] = "0123456789abcdef"; 1071 int j = 0, i = 4; /* offset to start of the identifier */ 1072 1073 /* 1074 * The VPD Code Set (encoding) 1075 * 1076 * from spc3r23.pdf Section 7.6.3.1 Table 296 1077 */ 1078 vpd->device_identifier_code_set = (page_83[0] & 0x0f); 1079 switch (vpd->device_identifier_code_set) { 1080 case 0x01: /* Binary */ 1081 vpd->device_identifier[j++] = 1082 hex_str[vpd->device_identifier_type]; 1083 while (i < (4 + page_83[3])) { 1084 vpd->device_identifier[j++] = 1085 hex_str[(page_83[i] & 0xf0) >> 4]; 1086 vpd->device_identifier[j++] = 1087 hex_str[page_83[i] & 0x0f]; 1088 i++; 1089 } 1090 break; 1091 case 0x02: /* ASCII */ 1092 case 0x03: /* UTF-8 */ 1093 while (i < (4 + page_83[3])) 1094 vpd->device_identifier[j++] = page_83[i++]; 1095 break; 1096 default: 1097 break; 1098 } 1099 1100 return transport_dump_vpd_ident(vpd, NULL, 0); 1101 } 1102 EXPORT_SYMBOL(transport_set_vpd_ident); 1103 1104 sense_reason_t 1105 target_cmd_size_check(struct se_cmd *cmd, unsigned int size) 1106 { 1107 struct se_device *dev = cmd->se_dev; 1108 1109 if (cmd->unknown_data_length) { 1110 cmd->data_length = size; 1111 } else if (size != cmd->data_length) { 1112 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:" 1113 " %u does not match SCSI CDB Length: %u for SAM Opcode:" 1114 " 0x%02x\n", cmd->se_tfo->get_fabric_name(), 1115 cmd->data_length, size, cmd->t_task_cdb[0]); 1116 1117 if (cmd->data_direction == DMA_TO_DEVICE) { 1118 pr_err("Rejecting underflow/overflow" 1119 " WRITE data\n"); 1120 return TCM_INVALID_CDB_FIELD; 1121 } 1122 /* 1123 * Reject READ_* or WRITE_* with overflow/underflow for 1124 * type SCF_SCSI_DATA_CDB. 1125 */ 1126 if (dev->dev_attrib.block_size != 512) { 1127 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op" 1128 " CDB on non 512-byte sector setup subsystem" 1129 " plugin: %s\n", dev->transport->name); 1130 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ 1131 return TCM_INVALID_CDB_FIELD; 1132 } 1133 /* 1134 * For the overflow case keep the existing fabric provided 1135 * ->data_length. Otherwise for the underflow case, reset 1136 * ->data_length to the smaller SCSI expected data transfer 1137 * length. 1138 */ 1139 if (size > cmd->data_length) { 1140 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; 1141 cmd->residual_count = (size - cmd->data_length); 1142 } else { 1143 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; 1144 cmd->residual_count = (cmd->data_length - size); 1145 cmd->data_length = size; 1146 } 1147 } 1148 1149 return 0; 1150 1151 } 1152 1153 /* 1154 * Used by fabric modules containing a local struct se_cmd within their 1155 * fabric dependent per I/O descriptor. 1156 */ 1157 void transport_init_se_cmd( 1158 struct se_cmd *cmd, 1159 const struct target_core_fabric_ops *tfo, 1160 struct se_session *se_sess, 1161 u32 data_length, 1162 int data_direction, 1163 int task_attr, 1164 unsigned char *sense_buffer) 1165 { 1166 INIT_LIST_HEAD(&cmd->se_delayed_node); 1167 INIT_LIST_HEAD(&cmd->se_qf_node); 1168 INIT_LIST_HEAD(&cmd->se_cmd_list); 1169 INIT_LIST_HEAD(&cmd->state_list); 1170 init_completion(&cmd->t_transport_stop_comp); 1171 init_completion(&cmd->cmd_wait_comp); 1172 init_completion(&cmd->task_stop_comp); 1173 spin_lock_init(&cmd->t_state_lock); 1174 kref_init(&cmd->cmd_kref); 1175 cmd->transport_state = CMD_T_DEV_ACTIVE; 1176 1177 cmd->se_tfo = tfo; 1178 cmd->se_sess = se_sess; 1179 cmd->data_length = data_length; 1180 cmd->data_direction = data_direction; 1181 cmd->sam_task_attr = task_attr; 1182 cmd->sense_buffer = sense_buffer; 1183 1184 cmd->state_active = false; 1185 } 1186 EXPORT_SYMBOL(transport_init_se_cmd); 1187 1188 static sense_reason_t 1189 transport_check_alloc_task_attr(struct se_cmd *cmd) 1190 { 1191 struct se_device *dev = cmd->se_dev; 1192 1193 /* 1194 * Check if SAM Task Attribute emulation is enabled for this 1195 * struct se_device storage object 1196 */ 1197 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 1198 return 0; 1199 1200 if (cmd->sam_task_attr == TCM_ACA_TAG) { 1201 pr_debug("SAM Task Attribute ACA" 1202 " emulation is not supported\n"); 1203 return TCM_INVALID_CDB_FIELD; 1204 } 1205 /* 1206 * Used to determine when ORDERED commands should go from 1207 * Dormant to Active status. 1208 */ 1209 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id); 1210 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", 1211 cmd->se_ordered_id, cmd->sam_task_attr, 1212 dev->transport->name); 1213 return 0; 1214 } 1215 1216 sense_reason_t 1217 target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb) 1218 { 1219 struct se_device *dev = cmd->se_dev; 1220 sense_reason_t ret; 1221 1222 /* 1223 * Ensure that the received CDB is less than the max (252 + 8) bytes 1224 * for VARIABLE_LENGTH_CMD 1225 */ 1226 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { 1227 pr_err("Received SCSI CDB with command_size: %d that" 1228 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", 1229 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); 1230 return TCM_INVALID_CDB_FIELD; 1231 } 1232 /* 1233 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, 1234 * allocate the additional extended CDB buffer now.. Otherwise 1235 * setup the pointer from __t_task_cdb to t_task_cdb. 1236 */ 1237 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) { 1238 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb), 1239 GFP_KERNEL); 1240 if (!cmd->t_task_cdb) { 1241 pr_err("Unable to allocate cmd->t_task_cdb" 1242 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n", 1243 scsi_command_size(cdb), 1244 (unsigned long)sizeof(cmd->__t_task_cdb)); 1245 return TCM_OUT_OF_RESOURCES; 1246 } 1247 } else 1248 cmd->t_task_cdb = &cmd->__t_task_cdb[0]; 1249 /* 1250 * Copy the original CDB into cmd-> 1251 */ 1252 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb)); 1253 1254 trace_target_sequencer_start(cmd); 1255 1256 /* 1257 * Check for an existing UNIT ATTENTION condition 1258 */ 1259 ret = target_scsi3_ua_check(cmd); 1260 if (ret) 1261 return ret; 1262 1263 ret = target_alua_state_check(cmd); 1264 if (ret) 1265 return ret; 1266 1267 ret = target_check_reservation(cmd); 1268 if (ret) { 1269 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1270 return ret; 1271 } 1272 1273 ret = dev->transport->parse_cdb(cmd); 1274 if (ret) 1275 return ret; 1276 1277 ret = transport_check_alloc_task_attr(cmd); 1278 if (ret) 1279 return ret; 1280 1281 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; 1282 1283 spin_lock(&cmd->se_lun->lun_sep_lock); 1284 if (cmd->se_lun->lun_sep) 1285 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; 1286 spin_unlock(&cmd->se_lun->lun_sep_lock); 1287 return 0; 1288 } 1289 EXPORT_SYMBOL(target_setup_cmd_from_cdb); 1290 1291 /* 1292 * Used by fabric module frontends to queue tasks directly. 1293 * Many only be used from process context only 1294 */ 1295 int transport_handle_cdb_direct( 1296 struct se_cmd *cmd) 1297 { 1298 sense_reason_t ret; 1299 1300 if (!cmd->se_lun) { 1301 dump_stack(); 1302 pr_err("cmd->se_lun is NULL\n"); 1303 return -EINVAL; 1304 } 1305 if (in_interrupt()) { 1306 dump_stack(); 1307 pr_err("transport_generic_handle_cdb cannot be called" 1308 " from interrupt context\n"); 1309 return -EINVAL; 1310 } 1311 /* 1312 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that 1313 * outstanding descriptors are handled correctly during shutdown via 1314 * transport_wait_for_tasks() 1315 * 1316 * Also, we don't take cmd->t_state_lock here as we only expect 1317 * this to be called for initial descriptor submission. 1318 */ 1319 cmd->t_state = TRANSPORT_NEW_CMD; 1320 cmd->transport_state |= CMD_T_ACTIVE; 1321 1322 /* 1323 * transport_generic_new_cmd() is already handling QUEUE_FULL, 1324 * so follow TRANSPORT_NEW_CMD processing thread context usage 1325 * and call transport_generic_request_failure() if necessary.. 1326 */ 1327 ret = transport_generic_new_cmd(cmd); 1328 if (ret) 1329 transport_generic_request_failure(cmd, ret); 1330 return 0; 1331 } 1332 EXPORT_SYMBOL(transport_handle_cdb_direct); 1333 1334 sense_reason_t 1335 transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl, 1336 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count) 1337 { 1338 if (!sgl || !sgl_count) 1339 return 0; 1340 1341 /* 1342 * Reject SCSI data overflow with map_mem_to_cmd() as incoming 1343 * scatterlists already have been set to follow what the fabric 1344 * passes for the original expected data transfer length. 1345 */ 1346 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) { 1347 pr_warn("Rejecting SCSI DATA overflow for fabric using" 1348 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n"); 1349 return TCM_INVALID_CDB_FIELD; 1350 } 1351 1352 cmd->t_data_sg = sgl; 1353 cmd->t_data_nents = sgl_count; 1354 1355 if (sgl_bidi && sgl_bidi_count) { 1356 cmd->t_bidi_data_sg = sgl_bidi; 1357 cmd->t_bidi_data_nents = sgl_bidi_count; 1358 } 1359 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; 1360 return 0; 1361 } 1362 1363 /* 1364 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized 1365 * se_cmd + use pre-allocated SGL memory. 1366 * 1367 * @se_cmd: command descriptor to submit 1368 * @se_sess: associated se_sess for endpoint 1369 * @cdb: pointer to SCSI CDB 1370 * @sense: pointer to SCSI sense buffer 1371 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1372 * @data_length: fabric expected data transfer length 1373 * @task_addr: SAM task attribute 1374 * @data_dir: DMA data direction 1375 * @flags: flags for command submission from target_sc_flags_tables 1376 * @sgl: struct scatterlist memory for unidirectional mapping 1377 * @sgl_count: scatterlist count for unidirectional mapping 1378 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping 1379 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping 1380 * @sgl_prot: struct scatterlist memory protection information 1381 * @sgl_prot_count: scatterlist count for protection information 1382 * 1383 * Returns non zero to signal active I/O shutdown failure. All other 1384 * setup exceptions will be returned as a SCSI CHECK_CONDITION response, 1385 * but still return zero here. 1386 * 1387 * This may only be called from process context, and also currently 1388 * assumes internal allocation of fabric payload buffer by target-core. 1389 */ 1390 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess, 1391 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, 1392 u32 data_length, int task_attr, int data_dir, int flags, 1393 struct scatterlist *sgl, u32 sgl_count, 1394 struct scatterlist *sgl_bidi, u32 sgl_bidi_count, 1395 struct scatterlist *sgl_prot, u32 sgl_prot_count) 1396 { 1397 struct se_portal_group *se_tpg; 1398 sense_reason_t rc; 1399 int ret; 1400 1401 se_tpg = se_sess->se_tpg; 1402 BUG_ON(!se_tpg); 1403 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess); 1404 BUG_ON(in_interrupt()); 1405 /* 1406 * Initialize se_cmd for target operation. From this point 1407 * exceptions are handled by sending exception status via 1408 * target_core_fabric_ops->queue_status() callback 1409 */ 1410 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1411 data_length, data_dir, task_attr, sense); 1412 if (flags & TARGET_SCF_UNKNOWN_SIZE) 1413 se_cmd->unknown_data_length = 1; 1414 /* 1415 * Obtain struct se_cmd->cmd_kref reference and add new cmd to 1416 * se_sess->sess_cmd_list. A second kref_get here is necessary 1417 * for fabrics using TARGET_SCF_ACK_KREF that expect a second 1418 * kref_put() to happen during fabric packet acknowledgement. 1419 */ 1420 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1421 if (ret) 1422 return ret; 1423 /* 1424 * Signal bidirectional data payloads to target-core 1425 */ 1426 if (flags & TARGET_SCF_BIDI_OP) 1427 se_cmd->se_cmd_flags |= SCF_BIDI; 1428 /* 1429 * Locate se_lun pointer and attach it to struct se_cmd 1430 */ 1431 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun); 1432 if (rc) { 1433 transport_send_check_condition_and_sense(se_cmd, rc, 0); 1434 target_put_sess_cmd(se_sess, se_cmd); 1435 return 0; 1436 } 1437 1438 rc = target_setup_cmd_from_cdb(se_cmd, cdb); 1439 if (rc != 0) { 1440 transport_generic_request_failure(se_cmd, rc); 1441 return 0; 1442 } 1443 1444 /* 1445 * Save pointers for SGLs containing protection information, 1446 * if present. 1447 */ 1448 if (sgl_prot_count) { 1449 se_cmd->t_prot_sg = sgl_prot; 1450 se_cmd->t_prot_nents = sgl_prot_count; 1451 } 1452 1453 /* 1454 * When a non zero sgl_count has been passed perform SGL passthrough 1455 * mapping for pre-allocated fabric memory instead of having target 1456 * core perform an internal SGL allocation.. 1457 */ 1458 if (sgl_count != 0) { 1459 BUG_ON(!sgl); 1460 1461 /* 1462 * A work-around for tcm_loop as some userspace code via 1463 * scsi-generic do not memset their associated read buffers, 1464 * so go ahead and do that here for type non-data CDBs. Also 1465 * note that this is currently guaranteed to be a single SGL 1466 * for this case by target core in target_setup_cmd_from_cdb() 1467 * -> transport_generic_cmd_sequencer(). 1468 */ 1469 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && 1470 se_cmd->data_direction == DMA_FROM_DEVICE) { 1471 unsigned char *buf = NULL; 1472 1473 if (sgl) 1474 buf = kmap(sg_page(sgl)) + sgl->offset; 1475 1476 if (buf) { 1477 memset(buf, 0, sgl->length); 1478 kunmap(sg_page(sgl)); 1479 } 1480 } 1481 1482 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count, 1483 sgl_bidi, sgl_bidi_count); 1484 if (rc != 0) { 1485 transport_generic_request_failure(se_cmd, rc); 1486 return 0; 1487 } 1488 } 1489 1490 /* 1491 * Check if we need to delay processing because of ALUA 1492 * Active/NonOptimized primary access state.. 1493 */ 1494 core_alua_check_nonop_delay(se_cmd); 1495 1496 transport_handle_cdb_direct(se_cmd); 1497 return 0; 1498 } 1499 EXPORT_SYMBOL(target_submit_cmd_map_sgls); 1500 1501 /* 1502 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd 1503 * 1504 * @se_cmd: command descriptor to submit 1505 * @se_sess: associated se_sess for endpoint 1506 * @cdb: pointer to SCSI CDB 1507 * @sense: pointer to SCSI sense buffer 1508 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1509 * @data_length: fabric expected data transfer length 1510 * @task_addr: SAM task attribute 1511 * @data_dir: DMA data direction 1512 * @flags: flags for command submission from target_sc_flags_tables 1513 * 1514 * Returns non zero to signal active I/O shutdown failure. All other 1515 * setup exceptions will be returned as a SCSI CHECK_CONDITION response, 1516 * but still return zero here. 1517 * 1518 * This may only be called from process context, and also currently 1519 * assumes internal allocation of fabric payload buffer by target-core. 1520 * 1521 * It also assumes interal target core SGL memory allocation. 1522 */ 1523 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess, 1524 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun, 1525 u32 data_length, int task_attr, int data_dir, int flags) 1526 { 1527 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense, 1528 unpacked_lun, data_length, task_attr, data_dir, 1529 flags, NULL, 0, NULL, 0, NULL, 0); 1530 } 1531 EXPORT_SYMBOL(target_submit_cmd); 1532 1533 static void target_complete_tmr_failure(struct work_struct *work) 1534 { 1535 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work); 1536 1537 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; 1538 se_cmd->se_tfo->queue_tm_rsp(se_cmd); 1539 1540 transport_cmd_check_stop_to_fabric(se_cmd); 1541 } 1542 1543 /** 1544 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd 1545 * for TMR CDBs 1546 * 1547 * @se_cmd: command descriptor to submit 1548 * @se_sess: associated se_sess for endpoint 1549 * @sense: pointer to SCSI sense buffer 1550 * @unpacked_lun: unpacked LUN to reference for struct se_lun 1551 * @fabric_context: fabric context for TMR req 1552 * @tm_type: Type of TM request 1553 * @gfp: gfp type for caller 1554 * @tag: referenced task tag for TMR_ABORT_TASK 1555 * @flags: submit cmd flags 1556 * 1557 * Callable from all contexts. 1558 **/ 1559 1560 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess, 1561 unsigned char *sense, u32 unpacked_lun, 1562 void *fabric_tmr_ptr, unsigned char tm_type, 1563 gfp_t gfp, unsigned int tag, int flags) 1564 { 1565 struct se_portal_group *se_tpg; 1566 int ret; 1567 1568 se_tpg = se_sess->se_tpg; 1569 BUG_ON(!se_tpg); 1570 1571 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 1572 0, DMA_NONE, TCM_SIMPLE_TAG, sense); 1573 /* 1574 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req 1575 * allocation failure. 1576 */ 1577 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp); 1578 if (ret < 0) 1579 return -ENOMEM; 1580 1581 if (tm_type == TMR_ABORT_TASK) 1582 se_cmd->se_tmr_req->ref_task_tag = tag; 1583 1584 /* See target_submit_cmd for commentary */ 1585 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF)); 1586 if (ret) { 1587 core_tmr_release_req(se_cmd->se_tmr_req); 1588 return ret; 1589 } 1590 1591 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun); 1592 if (ret) { 1593 /* 1594 * For callback during failure handling, push this work off 1595 * to process context with TMR_LUN_DOES_NOT_EXIST status. 1596 */ 1597 INIT_WORK(&se_cmd->work, target_complete_tmr_failure); 1598 schedule_work(&se_cmd->work); 1599 return 0; 1600 } 1601 transport_generic_handle_tmr(se_cmd); 1602 return 0; 1603 } 1604 EXPORT_SYMBOL(target_submit_tmr); 1605 1606 /* 1607 * If the cmd is active, request it to be stopped and sleep until it 1608 * has completed. 1609 */ 1610 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags) 1611 __releases(&cmd->t_state_lock) 1612 __acquires(&cmd->t_state_lock) 1613 { 1614 bool was_active = false; 1615 1616 if (cmd->transport_state & CMD_T_BUSY) { 1617 cmd->transport_state |= CMD_T_REQUEST_STOP; 1618 spin_unlock_irqrestore(&cmd->t_state_lock, *flags); 1619 1620 pr_debug("cmd %p waiting to complete\n", cmd); 1621 wait_for_completion(&cmd->task_stop_comp); 1622 pr_debug("cmd %p stopped successfully\n", cmd); 1623 1624 spin_lock_irqsave(&cmd->t_state_lock, *flags); 1625 cmd->transport_state &= ~CMD_T_REQUEST_STOP; 1626 cmd->transport_state &= ~CMD_T_BUSY; 1627 was_active = true; 1628 } 1629 1630 return was_active; 1631 } 1632 1633 /* 1634 * Handle SAM-esque emulation for generic transport request failures. 1635 */ 1636 void transport_generic_request_failure(struct se_cmd *cmd, 1637 sense_reason_t sense_reason) 1638 { 1639 int ret = 0; 1640 1641 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" 1642 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd), 1643 cmd->t_task_cdb[0]); 1644 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n", 1645 cmd->se_tfo->get_cmd_state(cmd), 1646 cmd->t_state, sense_reason); 1647 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n", 1648 (cmd->transport_state & CMD_T_ACTIVE) != 0, 1649 (cmd->transport_state & CMD_T_STOP) != 0, 1650 (cmd->transport_state & CMD_T_SENT) != 0); 1651 1652 /* 1653 * For SAM Task Attribute emulation for failed struct se_cmd 1654 */ 1655 transport_complete_task_attr(cmd); 1656 /* 1657 * Handle special case for COMPARE_AND_WRITE failure, where the 1658 * callback is expected to drop the per device ->caw_sem. 1659 */ 1660 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && 1661 cmd->transport_complete_callback) 1662 cmd->transport_complete_callback(cmd, false); 1663 1664 switch (sense_reason) { 1665 case TCM_NON_EXISTENT_LUN: 1666 case TCM_UNSUPPORTED_SCSI_OPCODE: 1667 case TCM_INVALID_CDB_FIELD: 1668 case TCM_INVALID_PARAMETER_LIST: 1669 case TCM_PARAMETER_LIST_LENGTH_ERROR: 1670 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 1671 case TCM_UNKNOWN_MODE_PAGE: 1672 case TCM_WRITE_PROTECTED: 1673 case TCM_ADDRESS_OUT_OF_RANGE: 1674 case TCM_CHECK_CONDITION_ABORT_CMD: 1675 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 1676 case TCM_CHECK_CONDITION_NOT_READY: 1677 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: 1678 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: 1679 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: 1680 break; 1681 case TCM_OUT_OF_RESOURCES: 1682 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1683 break; 1684 case TCM_RESERVATION_CONFLICT: 1685 /* 1686 * No SENSE Data payload for this case, set SCSI Status 1687 * and queue the response to $FABRIC_MOD. 1688 * 1689 * Uses linux/include/scsi/scsi.h SAM status codes defs 1690 */ 1691 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; 1692 /* 1693 * For UA Interlock Code 11b, a RESERVATION CONFLICT will 1694 * establish a UNIT ATTENTION with PREVIOUS RESERVATION 1695 * CONFLICT STATUS. 1696 * 1697 * See spc4r17, section 7.4.6 Control Mode Page, Table 349 1698 */ 1699 if (cmd->se_sess && 1700 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2) 1701 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl, 1702 cmd->orig_fe_lun, 0x2C, 1703 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); 1704 1705 trace_target_cmd_complete(cmd); 1706 ret = cmd->se_tfo-> queue_status(cmd); 1707 if (ret == -EAGAIN || ret == -ENOMEM) 1708 goto queue_full; 1709 goto check_stop; 1710 default: 1711 pr_err("Unknown transport error for CDB 0x%02x: %d\n", 1712 cmd->t_task_cdb[0], sense_reason); 1713 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; 1714 break; 1715 } 1716 1717 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0); 1718 if (ret == -EAGAIN || ret == -ENOMEM) 1719 goto queue_full; 1720 1721 check_stop: 1722 transport_lun_remove_cmd(cmd); 1723 if (!transport_cmd_check_stop_to_fabric(cmd)) 1724 ; 1725 return; 1726 1727 queue_full: 1728 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 1729 transport_handle_queue_full(cmd, cmd->se_dev); 1730 } 1731 EXPORT_SYMBOL(transport_generic_request_failure); 1732 1733 void __target_execute_cmd(struct se_cmd *cmd) 1734 { 1735 sense_reason_t ret; 1736 1737 if (cmd->execute_cmd) { 1738 ret = cmd->execute_cmd(cmd); 1739 if (ret) { 1740 spin_lock_irq(&cmd->t_state_lock); 1741 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); 1742 spin_unlock_irq(&cmd->t_state_lock); 1743 1744 transport_generic_request_failure(cmd, ret); 1745 } 1746 } 1747 } 1748 1749 static int target_write_prot_action(struct se_cmd *cmd) 1750 { 1751 u32 sectors; 1752 /* 1753 * Perform WRITE_INSERT of PI using software emulation when backend 1754 * device has PI enabled, if the transport has not already generated 1755 * PI using hardware WRITE_INSERT offload. 1756 */ 1757 switch (cmd->prot_op) { 1758 case TARGET_PROT_DOUT_INSERT: 1759 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT)) 1760 sbc_dif_generate(cmd); 1761 break; 1762 case TARGET_PROT_DOUT_STRIP: 1763 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP) 1764 break; 1765 1766 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size); 1767 cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba, 1768 sectors, 0, NULL, 0); 1769 if (unlikely(cmd->pi_err)) { 1770 spin_lock_irq(&cmd->t_state_lock); 1771 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT); 1772 spin_unlock_irq(&cmd->t_state_lock); 1773 transport_generic_request_failure(cmd, cmd->pi_err); 1774 return -1; 1775 } 1776 break; 1777 default: 1778 break; 1779 } 1780 1781 return 0; 1782 } 1783 1784 static bool target_handle_task_attr(struct se_cmd *cmd) 1785 { 1786 struct se_device *dev = cmd->se_dev; 1787 1788 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 1789 return false; 1790 1791 /* 1792 * Check for the existence of HEAD_OF_QUEUE, and if true return 1 1793 * to allow the passed struct se_cmd list of tasks to the front of the list. 1794 */ 1795 switch (cmd->sam_task_attr) { 1796 case TCM_HEAD_TAG: 1797 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, " 1798 "se_ordered_id: %u\n", 1799 cmd->t_task_cdb[0], cmd->se_ordered_id); 1800 return false; 1801 case TCM_ORDERED_TAG: 1802 atomic_inc_mb(&dev->dev_ordered_sync); 1803 1804 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, " 1805 " se_ordered_id: %u\n", 1806 cmd->t_task_cdb[0], cmd->se_ordered_id); 1807 1808 /* 1809 * Execute an ORDERED command if no other older commands 1810 * exist that need to be completed first. 1811 */ 1812 if (!atomic_read(&dev->simple_cmds)) 1813 return false; 1814 break; 1815 default: 1816 /* 1817 * For SIMPLE and UNTAGGED Task Attribute commands 1818 */ 1819 atomic_inc_mb(&dev->simple_cmds); 1820 break; 1821 } 1822 1823 if (atomic_read(&dev->dev_ordered_sync) == 0) 1824 return false; 1825 1826 spin_lock(&dev->delayed_cmd_lock); 1827 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); 1828 spin_unlock(&dev->delayed_cmd_lock); 1829 1830 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to" 1831 " delayed CMD list, se_ordered_id: %u\n", 1832 cmd->t_task_cdb[0], cmd->sam_task_attr, 1833 cmd->se_ordered_id); 1834 return true; 1835 } 1836 1837 void target_execute_cmd(struct se_cmd *cmd) 1838 { 1839 /* 1840 * If the received CDB has aleady been aborted stop processing it here. 1841 */ 1842 if (transport_check_aborted_status(cmd, 1)) 1843 return; 1844 1845 /* 1846 * Determine if frontend context caller is requesting the stopping of 1847 * this command for frontend exceptions. 1848 */ 1849 spin_lock_irq(&cmd->t_state_lock); 1850 if (cmd->transport_state & CMD_T_STOP) { 1851 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n", 1852 __func__, __LINE__, 1853 cmd->se_tfo->get_task_tag(cmd)); 1854 1855 spin_unlock_irq(&cmd->t_state_lock); 1856 complete_all(&cmd->t_transport_stop_comp); 1857 return; 1858 } 1859 1860 cmd->t_state = TRANSPORT_PROCESSING; 1861 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT; 1862 spin_unlock_irq(&cmd->t_state_lock); 1863 1864 if (target_write_prot_action(cmd)) 1865 return; 1866 1867 if (target_handle_task_attr(cmd)) { 1868 spin_lock_irq(&cmd->t_state_lock); 1869 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT); 1870 spin_unlock_irq(&cmd->t_state_lock); 1871 return; 1872 } 1873 1874 __target_execute_cmd(cmd); 1875 } 1876 EXPORT_SYMBOL(target_execute_cmd); 1877 1878 /* 1879 * Process all commands up to the last received ORDERED task attribute which 1880 * requires another blocking boundary 1881 */ 1882 static void target_restart_delayed_cmds(struct se_device *dev) 1883 { 1884 for (;;) { 1885 struct se_cmd *cmd; 1886 1887 spin_lock(&dev->delayed_cmd_lock); 1888 if (list_empty(&dev->delayed_cmd_list)) { 1889 spin_unlock(&dev->delayed_cmd_lock); 1890 break; 1891 } 1892 1893 cmd = list_entry(dev->delayed_cmd_list.next, 1894 struct se_cmd, se_delayed_node); 1895 list_del(&cmd->se_delayed_node); 1896 spin_unlock(&dev->delayed_cmd_lock); 1897 1898 __target_execute_cmd(cmd); 1899 1900 if (cmd->sam_task_attr == TCM_ORDERED_TAG) 1901 break; 1902 } 1903 } 1904 1905 /* 1906 * Called from I/O completion to determine which dormant/delayed 1907 * and ordered cmds need to have their tasks added to the execution queue. 1908 */ 1909 static void transport_complete_task_attr(struct se_cmd *cmd) 1910 { 1911 struct se_device *dev = cmd->se_dev; 1912 1913 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) 1914 return; 1915 1916 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { 1917 atomic_dec_mb(&dev->simple_cmds); 1918 dev->dev_cur_ordered_id++; 1919 pr_debug("Incremented dev->dev_cur_ordered_id: %u for" 1920 " SIMPLE: %u\n", dev->dev_cur_ordered_id, 1921 cmd->se_ordered_id); 1922 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) { 1923 dev->dev_cur_ordered_id++; 1924 pr_debug("Incremented dev_cur_ordered_id: %u for" 1925 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, 1926 cmd->se_ordered_id); 1927 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) { 1928 atomic_dec_mb(&dev->dev_ordered_sync); 1929 1930 dev->dev_cur_ordered_id++; 1931 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:" 1932 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); 1933 } 1934 1935 target_restart_delayed_cmds(dev); 1936 } 1937 1938 static void transport_complete_qf(struct se_cmd *cmd) 1939 { 1940 int ret = 0; 1941 1942 transport_complete_task_attr(cmd); 1943 1944 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 1945 trace_target_cmd_complete(cmd); 1946 ret = cmd->se_tfo->queue_status(cmd); 1947 goto out; 1948 } 1949 1950 switch (cmd->data_direction) { 1951 case DMA_FROM_DEVICE: 1952 trace_target_cmd_complete(cmd); 1953 ret = cmd->se_tfo->queue_data_in(cmd); 1954 break; 1955 case DMA_TO_DEVICE: 1956 if (cmd->se_cmd_flags & SCF_BIDI) { 1957 ret = cmd->se_tfo->queue_data_in(cmd); 1958 break; 1959 } 1960 /* Fall through for DMA_TO_DEVICE */ 1961 case DMA_NONE: 1962 trace_target_cmd_complete(cmd); 1963 ret = cmd->se_tfo->queue_status(cmd); 1964 break; 1965 default: 1966 break; 1967 } 1968 1969 out: 1970 if (ret < 0) { 1971 transport_handle_queue_full(cmd, cmd->se_dev); 1972 return; 1973 } 1974 transport_lun_remove_cmd(cmd); 1975 transport_cmd_check_stop_to_fabric(cmd); 1976 } 1977 1978 static void transport_handle_queue_full( 1979 struct se_cmd *cmd, 1980 struct se_device *dev) 1981 { 1982 spin_lock_irq(&dev->qf_cmd_lock); 1983 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list); 1984 atomic_inc_mb(&dev->dev_qf_count); 1985 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock); 1986 1987 schedule_work(&cmd->se_dev->qf_work_queue); 1988 } 1989 1990 static bool target_read_prot_action(struct se_cmd *cmd) 1991 { 1992 sense_reason_t rc; 1993 1994 switch (cmd->prot_op) { 1995 case TARGET_PROT_DIN_STRIP: 1996 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) { 1997 rc = sbc_dif_read_strip(cmd); 1998 if (rc) { 1999 cmd->pi_err = rc; 2000 return true; 2001 } 2002 } 2003 break; 2004 case TARGET_PROT_DIN_INSERT: 2005 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT) 2006 break; 2007 2008 sbc_dif_generate(cmd); 2009 break; 2010 default: 2011 break; 2012 } 2013 2014 return false; 2015 } 2016 2017 static void target_complete_ok_work(struct work_struct *work) 2018 { 2019 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 2020 int ret; 2021 2022 /* 2023 * Check if we need to move delayed/dormant tasks from cmds on the 2024 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task 2025 * Attribute. 2026 */ 2027 transport_complete_task_attr(cmd); 2028 2029 /* 2030 * Check to schedule QUEUE_FULL work, or execute an existing 2031 * cmd->transport_qf_callback() 2032 */ 2033 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0) 2034 schedule_work(&cmd->se_dev->qf_work_queue); 2035 2036 /* 2037 * Check if we need to send a sense buffer from 2038 * the struct se_cmd in question. 2039 */ 2040 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { 2041 WARN_ON(!cmd->scsi_status); 2042 ret = transport_send_check_condition_and_sense( 2043 cmd, 0, 1); 2044 if (ret == -EAGAIN || ret == -ENOMEM) 2045 goto queue_full; 2046 2047 transport_lun_remove_cmd(cmd); 2048 transport_cmd_check_stop_to_fabric(cmd); 2049 return; 2050 } 2051 /* 2052 * Check for a callback, used by amongst other things 2053 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation. 2054 */ 2055 if (cmd->transport_complete_callback) { 2056 sense_reason_t rc; 2057 2058 rc = cmd->transport_complete_callback(cmd, true); 2059 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) { 2060 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && 2061 !cmd->data_length) 2062 goto queue_rsp; 2063 2064 return; 2065 } else if (rc) { 2066 ret = transport_send_check_condition_and_sense(cmd, 2067 rc, 0); 2068 if (ret == -EAGAIN || ret == -ENOMEM) 2069 goto queue_full; 2070 2071 transport_lun_remove_cmd(cmd); 2072 transport_cmd_check_stop_to_fabric(cmd); 2073 return; 2074 } 2075 } 2076 2077 queue_rsp: 2078 switch (cmd->data_direction) { 2079 case DMA_FROM_DEVICE: 2080 spin_lock(&cmd->se_lun->lun_sep_lock); 2081 if (cmd->se_lun->lun_sep) { 2082 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2083 cmd->data_length; 2084 } 2085 spin_unlock(&cmd->se_lun->lun_sep_lock); 2086 /* 2087 * Perform READ_STRIP of PI using software emulation when 2088 * backend had PI enabled, if the transport will not be 2089 * performing hardware READ_STRIP offload. 2090 */ 2091 if (target_read_prot_action(cmd)) { 2092 ret = transport_send_check_condition_and_sense(cmd, 2093 cmd->pi_err, 0); 2094 if (ret == -EAGAIN || ret == -ENOMEM) 2095 goto queue_full; 2096 2097 transport_lun_remove_cmd(cmd); 2098 transport_cmd_check_stop_to_fabric(cmd); 2099 return; 2100 } 2101 2102 trace_target_cmd_complete(cmd); 2103 ret = cmd->se_tfo->queue_data_in(cmd); 2104 if (ret == -EAGAIN || ret == -ENOMEM) 2105 goto queue_full; 2106 break; 2107 case DMA_TO_DEVICE: 2108 spin_lock(&cmd->se_lun->lun_sep_lock); 2109 if (cmd->se_lun->lun_sep) { 2110 cmd->se_lun->lun_sep->sep_stats.rx_data_octets += 2111 cmd->data_length; 2112 } 2113 spin_unlock(&cmd->se_lun->lun_sep_lock); 2114 /* 2115 * Check if we need to send READ payload for BIDI-COMMAND 2116 */ 2117 if (cmd->se_cmd_flags & SCF_BIDI) { 2118 spin_lock(&cmd->se_lun->lun_sep_lock); 2119 if (cmd->se_lun->lun_sep) { 2120 cmd->se_lun->lun_sep->sep_stats.tx_data_octets += 2121 cmd->data_length; 2122 } 2123 spin_unlock(&cmd->se_lun->lun_sep_lock); 2124 ret = cmd->se_tfo->queue_data_in(cmd); 2125 if (ret == -EAGAIN || ret == -ENOMEM) 2126 goto queue_full; 2127 break; 2128 } 2129 /* Fall through for DMA_TO_DEVICE */ 2130 case DMA_NONE: 2131 trace_target_cmd_complete(cmd); 2132 ret = cmd->se_tfo->queue_status(cmd); 2133 if (ret == -EAGAIN || ret == -ENOMEM) 2134 goto queue_full; 2135 break; 2136 default: 2137 break; 2138 } 2139 2140 transport_lun_remove_cmd(cmd); 2141 transport_cmd_check_stop_to_fabric(cmd); 2142 return; 2143 2144 queue_full: 2145 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p," 2146 " data_direction: %d\n", cmd, cmd->data_direction); 2147 cmd->t_state = TRANSPORT_COMPLETE_QF_OK; 2148 transport_handle_queue_full(cmd, cmd->se_dev); 2149 } 2150 2151 static inline void transport_free_sgl(struct scatterlist *sgl, int nents) 2152 { 2153 struct scatterlist *sg; 2154 int count; 2155 2156 for_each_sg(sgl, sg, nents, count) 2157 __free_page(sg_page(sg)); 2158 2159 kfree(sgl); 2160 } 2161 2162 static inline void transport_reset_sgl_orig(struct se_cmd *cmd) 2163 { 2164 /* 2165 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE 2166 * emulation, and free + reset pointers if necessary.. 2167 */ 2168 if (!cmd->t_data_sg_orig) 2169 return; 2170 2171 kfree(cmd->t_data_sg); 2172 cmd->t_data_sg = cmd->t_data_sg_orig; 2173 cmd->t_data_sg_orig = NULL; 2174 cmd->t_data_nents = cmd->t_data_nents_orig; 2175 cmd->t_data_nents_orig = 0; 2176 } 2177 2178 static inline void transport_free_pages(struct se_cmd *cmd) 2179 { 2180 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) { 2181 /* 2182 * Release special case READ buffer payload required for 2183 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE 2184 */ 2185 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) { 2186 transport_free_sgl(cmd->t_bidi_data_sg, 2187 cmd->t_bidi_data_nents); 2188 cmd->t_bidi_data_sg = NULL; 2189 cmd->t_bidi_data_nents = 0; 2190 } 2191 transport_reset_sgl_orig(cmd); 2192 return; 2193 } 2194 transport_reset_sgl_orig(cmd); 2195 2196 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents); 2197 cmd->t_data_sg = NULL; 2198 cmd->t_data_nents = 0; 2199 2200 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents); 2201 cmd->t_bidi_data_sg = NULL; 2202 cmd->t_bidi_data_nents = 0; 2203 2204 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents); 2205 cmd->t_prot_sg = NULL; 2206 cmd->t_prot_nents = 0; 2207 } 2208 2209 /** 2210 * transport_release_cmd - free a command 2211 * @cmd: command to free 2212 * 2213 * This routine unconditionally frees a command, and reference counting 2214 * or list removal must be done in the caller. 2215 */ 2216 static int transport_release_cmd(struct se_cmd *cmd) 2217 { 2218 BUG_ON(!cmd->se_tfo); 2219 2220 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 2221 core_tmr_release_req(cmd->se_tmr_req); 2222 if (cmd->t_task_cdb != cmd->__t_task_cdb) 2223 kfree(cmd->t_task_cdb); 2224 /* 2225 * If this cmd has been setup with target_get_sess_cmd(), drop 2226 * the kref and call ->release_cmd() in kref callback. 2227 */ 2228 return target_put_sess_cmd(cmd->se_sess, cmd); 2229 } 2230 2231 /** 2232 * transport_put_cmd - release a reference to a command 2233 * @cmd: command to release 2234 * 2235 * This routine releases our reference to the command and frees it if possible. 2236 */ 2237 static int transport_put_cmd(struct se_cmd *cmd) 2238 { 2239 transport_free_pages(cmd); 2240 return transport_release_cmd(cmd); 2241 } 2242 2243 void *transport_kmap_data_sg(struct se_cmd *cmd) 2244 { 2245 struct scatterlist *sg = cmd->t_data_sg; 2246 struct page **pages; 2247 int i; 2248 2249 /* 2250 * We need to take into account a possible offset here for fabrics like 2251 * tcm_loop who may be using a contig buffer from the SCSI midlayer for 2252 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd() 2253 */ 2254 if (!cmd->t_data_nents) 2255 return NULL; 2256 2257 BUG_ON(!sg); 2258 if (cmd->t_data_nents == 1) 2259 return kmap(sg_page(sg)) + sg->offset; 2260 2261 /* >1 page. use vmap */ 2262 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL); 2263 if (!pages) 2264 return NULL; 2265 2266 /* convert sg[] to pages[] */ 2267 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) { 2268 pages[i] = sg_page(sg); 2269 } 2270 2271 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL); 2272 kfree(pages); 2273 if (!cmd->t_data_vmap) 2274 return NULL; 2275 2276 return cmd->t_data_vmap + cmd->t_data_sg[0].offset; 2277 } 2278 EXPORT_SYMBOL(transport_kmap_data_sg); 2279 2280 void transport_kunmap_data_sg(struct se_cmd *cmd) 2281 { 2282 if (!cmd->t_data_nents) { 2283 return; 2284 } else if (cmd->t_data_nents == 1) { 2285 kunmap(sg_page(cmd->t_data_sg)); 2286 return; 2287 } 2288 2289 vunmap(cmd->t_data_vmap); 2290 cmd->t_data_vmap = NULL; 2291 } 2292 EXPORT_SYMBOL(transport_kunmap_data_sg); 2293 2294 int 2295 target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length, 2296 bool zero_page) 2297 { 2298 struct scatterlist *sg; 2299 struct page *page; 2300 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0; 2301 unsigned int nent; 2302 int i = 0; 2303 2304 nent = DIV_ROUND_UP(length, PAGE_SIZE); 2305 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL); 2306 if (!sg) 2307 return -ENOMEM; 2308 2309 sg_init_table(sg, nent); 2310 2311 while (length) { 2312 u32 page_len = min_t(u32, length, PAGE_SIZE); 2313 page = alloc_page(GFP_KERNEL | zero_flag); 2314 if (!page) 2315 goto out; 2316 2317 sg_set_page(&sg[i], page, page_len, 0); 2318 length -= page_len; 2319 i++; 2320 } 2321 *sgl = sg; 2322 *nents = nent; 2323 return 0; 2324 2325 out: 2326 while (i > 0) { 2327 i--; 2328 __free_page(sg_page(&sg[i])); 2329 } 2330 kfree(sg); 2331 return -ENOMEM; 2332 } 2333 2334 /* 2335 * Allocate any required resources to execute the command. For writes we 2336 * might not have the payload yet, so notify the fabric via a call to 2337 * ->write_pending instead. Otherwise place it on the execution queue. 2338 */ 2339 sense_reason_t 2340 transport_generic_new_cmd(struct se_cmd *cmd) 2341 { 2342 int ret = 0; 2343 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB); 2344 2345 /* 2346 * Determine is the TCM fabric module has already allocated physical 2347 * memory, and is directly calling transport_generic_map_mem_to_cmd() 2348 * beforehand. 2349 */ 2350 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) && 2351 cmd->data_length) { 2352 2353 if ((cmd->se_cmd_flags & SCF_BIDI) || 2354 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) { 2355 u32 bidi_length; 2356 2357 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) 2358 bidi_length = cmd->t_task_nolb * 2359 cmd->se_dev->dev_attrib.block_size; 2360 else 2361 bidi_length = cmd->data_length; 2362 2363 ret = target_alloc_sgl(&cmd->t_bidi_data_sg, 2364 &cmd->t_bidi_data_nents, 2365 bidi_length, zero_flag); 2366 if (ret < 0) 2367 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2368 } 2369 2370 if (cmd->prot_op != TARGET_PROT_NORMAL) { 2371 ret = target_alloc_sgl(&cmd->t_prot_sg, 2372 &cmd->t_prot_nents, 2373 cmd->prot_length, true); 2374 if (ret < 0) 2375 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2376 } 2377 2378 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents, 2379 cmd->data_length, zero_flag); 2380 if (ret < 0) 2381 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2382 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) && 2383 cmd->data_length) { 2384 /* 2385 * Special case for COMPARE_AND_WRITE with fabrics 2386 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC. 2387 */ 2388 u32 caw_length = cmd->t_task_nolb * 2389 cmd->se_dev->dev_attrib.block_size; 2390 2391 ret = target_alloc_sgl(&cmd->t_bidi_data_sg, 2392 &cmd->t_bidi_data_nents, 2393 caw_length, zero_flag); 2394 if (ret < 0) 2395 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2396 } 2397 /* 2398 * If this command is not a write we can execute it right here, 2399 * for write buffers we need to notify the fabric driver first 2400 * and let it call back once the write buffers are ready. 2401 */ 2402 target_add_to_state_list(cmd); 2403 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) { 2404 target_execute_cmd(cmd); 2405 return 0; 2406 } 2407 transport_cmd_check_stop(cmd, false, true); 2408 2409 ret = cmd->se_tfo->write_pending(cmd); 2410 if (ret == -EAGAIN || ret == -ENOMEM) 2411 goto queue_full; 2412 2413 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */ 2414 WARN_ON(ret); 2415 2416 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 2417 2418 queue_full: 2419 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd); 2420 cmd->t_state = TRANSPORT_COMPLETE_QF_WP; 2421 transport_handle_queue_full(cmd, cmd->se_dev); 2422 return 0; 2423 } 2424 EXPORT_SYMBOL(transport_generic_new_cmd); 2425 2426 static void transport_write_pending_qf(struct se_cmd *cmd) 2427 { 2428 int ret; 2429 2430 ret = cmd->se_tfo->write_pending(cmd); 2431 if (ret == -EAGAIN || ret == -ENOMEM) { 2432 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", 2433 cmd); 2434 transport_handle_queue_full(cmd, cmd->se_dev); 2435 } 2436 } 2437 2438 int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks) 2439 { 2440 unsigned long flags; 2441 int ret = 0; 2442 2443 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) { 2444 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) 2445 transport_wait_for_tasks(cmd); 2446 2447 ret = transport_release_cmd(cmd); 2448 } else { 2449 if (wait_for_tasks) 2450 transport_wait_for_tasks(cmd); 2451 /* 2452 * Handle WRITE failure case where transport_generic_new_cmd() 2453 * has already added se_cmd to state_list, but fabric has 2454 * failed command before I/O submission. 2455 */ 2456 if (cmd->state_active) { 2457 spin_lock_irqsave(&cmd->t_state_lock, flags); 2458 target_remove_from_state_list(cmd); 2459 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2460 } 2461 2462 if (cmd->se_lun) 2463 transport_lun_remove_cmd(cmd); 2464 2465 ret = transport_put_cmd(cmd); 2466 } 2467 return ret; 2468 } 2469 EXPORT_SYMBOL(transport_generic_free_cmd); 2470 2471 /* target_get_sess_cmd - Add command to active ->sess_cmd_list 2472 * @se_sess: session to reference 2473 * @se_cmd: command descriptor to add 2474 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd() 2475 */ 2476 int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd, 2477 bool ack_kref) 2478 { 2479 unsigned long flags; 2480 int ret = 0; 2481 2482 /* 2483 * Add a second kref if the fabric caller is expecting to handle 2484 * fabric acknowledgement that requires two target_put_sess_cmd() 2485 * invocations before se_cmd descriptor release. 2486 */ 2487 if (ack_kref) 2488 kref_get(&se_cmd->cmd_kref); 2489 2490 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2491 if (se_sess->sess_tearing_down) { 2492 ret = -ESHUTDOWN; 2493 goto out; 2494 } 2495 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list); 2496 out: 2497 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2498 2499 if (ret && ack_kref) 2500 target_put_sess_cmd(se_sess, se_cmd); 2501 2502 return ret; 2503 } 2504 EXPORT_SYMBOL(target_get_sess_cmd); 2505 2506 static void target_release_cmd_kref(struct kref *kref) 2507 __releases(&se_cmd->se_sess->sess_cmd_lock) 2508 { 2509 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref); 2510 struct se_session *se_sess = se_cmd->se_sess; 2511 2512 if (list_empty(&se_cmd->se_cmd_list)) { 2513 spin_unlock(&se_sess->sess_cmd_lock); 2514 se_cmd->se_tfo->release_cmd(se_cmd); 2515 return; 2516 } 2517 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) { 2518 spin_unlock(&se_sess->sess_cmd_lock); 2519 complete(&se_cmd->cmd_wait_comp); 2520 return; 2521 } 2522 list_del(&se_cmd->se_cmd_list); 2523 spin_unlock(&se_sess->sess_cmd_lock); 2524 2525 se_cmd->se_tfo->release_cmd(se_cmd); 2526 } 2527 2528 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put 2529 * @se_sess: session to reference 2530 * @se_cmd: command descriptor to drop 2531 */ 2532 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd) 2533 { 2534 if (!se_sess) { 2535 se_cmd->se_tfo->release_cmd(se_cmd); 2536 return 1; 2537 } 2538 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref, 2539 &se_sess->sess_cmd_lock); 2540 } 2541 EXPORT_SYMBOL(target_put_sess_cmd); 2542 2543 /* target_sess_cmd_list_set_waiting - Flag all commands in 2544 * sess_cmd_list to complete cmd_wait_comp. Set 2545 * sess_tearing_down so no more commands are queued. 2546 * @se_sess: session to flag 2547 */ 2548 void target_sess_cmd_list_set_waiting(struct se_session *se_sess) 2549 { 2550 struct se_cmd *se_cmd; 2551 unsigned long flags; 2552 2553 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2554 if (se_sess->sess_tearing_down) { 2555 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2556 return; 2557 } 2558 se_sess->sess_tearing_down = 1; 2559 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list); 2560 2561 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) 2562 se_cmd->cmd_wait_set = 1; 2563 2564 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2565 } 2566 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting); 2567 2568 /* target_wait_for_sess_cmds - Wait for outstanding descriptors 2569 * @se_sess: session to wait for active I/O 2570 */ 2571 void target_wait_for_sess_cmds(struct se_session *se_sess) 2572 { 2573 struct se_cmd *se_cmd, *tmp_cmd; 2574 unsigned long flags; 2575 2576 list_for_each_entry_safe(se_cmd, tmp_cmd, 2577 &se_sess->sess_wait_list, se_cmd_list) { 2578 list_del(&se_cmd->se_cmd_list); 2579 2580 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:" 2581 " %d\n", se_cmd, se_cmd->t_state, 2582 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2583 2584 wait_for_completion(&se_cmd->cmd_wait_comp); 2585 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d" 2586 " fabric state: %d\n", se_cmd, se_cmd->t_state, 2587 se_cmd->se_tfo->get_cmd_state(se_cmd)); 2588 2589 se_cmd->se_tfo->release_cmd(se_cmd); 2590 } 2591 2592 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 2593 WARN_ON(!list_empty(&se_sess->sess_cmd_list)); 2594 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 2595 2596 } 2597 EXPORT_SYMBOL(target_wait_for_sess_cmds); 2598 2599 static int transport_clear_lun_ref_thread(void *p) 2600 { 2601 struct se_lun *lun = p; 2602 2603 percpu_ref_kill(&lun->lun_ref); 2604 2605 wait_for_completion(&lun->lun_ref_comp); 2606 complete(&lun->lun_shutdown_comp); 2607 2608 return 0; 2609 } 2610 2611 int transport_clear_lun_ref(struct se_lun *lun) 2612 { 2613 struct task_struct *kt; 2614 2615 kt = kthread_run(transport_clear_lun_ref_thread, lun, 2616 "tcm_cl_%u", lun->unpacked_lun); 2617 if (IS_ERR(kt)) { 2618 pr_err("Unable to start clear_lun thread\n"); 2619 return PTR_ERR(kt); 2620 } 2621 wait_for_completion(&lun->lun_shutdown_comp); 2622 2623 return 0; 2624 } 2625 2626 /** 2627 * transport_wait_for_tasks - wait for completion to occur 2628 * @cmd: command to wait 2629 * 2630 * Called from frontend fabric context to wait for storage engine 2631 * to pause and/or release frontend generated struct se_cmd. 2632 */ 2633 bool transport_wait_for_tasks(struct se_cmd *cmd) 2634 { 2635 unsigned long flags; 2636 2637 spin_lock_irqsave(&cmd->t_state_lock, flags); 2638 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && 2639 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2640 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2641 return false; 2642 } 2643 2644 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && 2645 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) { 2646 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2647 return false; 2648 } 2649 2650 if (!(cmd->transport_state & CMD_T_ACTIVE)) { 2651 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2652 return false; 2653 } 2654 2655 cmd->transport_state |= CMD_T_STOP; 2656 2657 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x" 2658 " i_state: %d, t_state: %d, CMD_T_STOP\n", 2659 cmd, cmd->se_tfo->get_task_tag(cmd), 2660 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state); 2661 2662 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2663 2664 wait_for_completion(&cmd->t_transport_stop_comp); 2665 2666 spin_lock_irqsave(&cmd->t_state_lock, flags); 2667 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP); 2668 2669 pr_debug("wait_for_tasks: Stopped wait_for_completion(" 2670 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n", 2671 cmd->se_tfo->get_task_tag(cmd)); 2672 2673 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2674 2675 return true; 2676 } 2677 EXPORT_SYMBOL(transport_wait_for_tasks); 2678 2679 static int transport_get_sense_codes( 2680 struct se_cmd *cmd, 2681 u8 *asc, 2682 u8 *ascq) 2683 { 2684 *asc = cmd->scsi_asc; 2685 *ascq = cmd->scsi_ascq; 2686 2687 return 0; 2688 } 2689 2690 static 2691 void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector) 2692 { 2693 /* Place failed LBA in sense data information descriptor 0. */ 2694 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc; 2695 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */ 2696 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa; 2697 buffer[SPC_VALIDITY_OFFSET] = 0x80; 2698 2699 /* Descriptor Information: failing sector */ 2700 put_unaligned_be64(bad_sector, &buffer[12]); 2701 } 2702 2703 int 2704 transport_send_check_condition_and_sense(struct se_cmd *cmd, 2705 sense_reason_t reason, int from_transport) 2706 { 2707 unsigned char *buffer = cmd->sense_buffer; 2708 unsigned long flags; 2709 u8 asc = 0, ascq = 0; 2710 2711 spin_lock_irqsave(&cmd->t_state_lock, flags); 2712 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { 2713 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2714 return 0; 2715 } 2716 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; 2717 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2718 2719 if (!reason && from_transport) 2720 goto after_reason; 2721 2722 if (!from_transport) 2723 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; 2724 2725 /* 2726 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses 2727 * SENSE KEY values from include/scsi/scsi.h 2728 */ 2729 switch (reason) { 2730 case TCM_NO_SENSE: 2731 /* CURRENT ERROR */ 2732 buffer[0] = 0x70; 2733 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2734 /* Not Ready */ 2735 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; 2736 /* NO ADDITIONAL SENSE INFORMATION */ 2737 buffer[SPC_ASC_KEY_OFFSET] = 0; 2738 buffer[SPC_ASCQ_KEY_OFFSET] = 0; 2739 break; 2740 case TCM_NON_EXISTENT_LUN: 2741 /* CURRENT ERROR */ 2742 buffer[0] = 0x70; 2743 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2744 /* ILLEGAL REQUEST */ 2745 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2746 /* LOGICAL UNIT NOT SUPPORTED */ 2747 buffer[SPC_ASC_KEY_OFFSET] = 0x25; 2748 break; 2749 case TCM_UNSUPPORTED_SCSI_OPCODE: 2750 case TCM_SECTOR_COUNT_TOO_MANY: 2751 /* CURRENT ERROR */ 2752 buffer[0] = 0x70; 2753 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2754 /* ILLEGAL REQUEST */ 2755 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2756 /* INVALID COMMAND OPERATION CODE */ 2757 buffer[SPC_ASC_KEY_OFFSET] = 0x20; 2758 break; 2759 case TCM_UNKNOWN_MODE_PAGE: 2760 /* CURRENT ERROR */ 2761 buffer[0] = 0x70; 2762 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2763 /* ILLEGAL REQUEST */ 2764 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2765 /* INVALID FIELD IN CDB */ 2766 buffer[SPC_ASC_KEY_OFFSET] = 0x24; 2767 break; 2768 case TCM_CHECK_CONDITION_ABORT_CMD: 2769 /* CURRENT ERROR */ 2770 buffer[0] = 0x70; 2771 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2772 /* ABORTED COMMAND */ 2773 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2774 /* BUS DEVICE RESET FUNCTION OCCURRED */ 2775 buffer[SPC_ASC_KEY_OFFSET] = 0x29; 2776 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; 2777 break; 2778 case TCM_INCORRECT_AMOUNT_OF_DATA: 2779 /* CURRENT ERROR */ 2780 buffer[0] = 0x70; 2781 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2782 /* ABORTED COMMAND */ 2783 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2784 /* WRITE ERROR */ 2785 buffer[SPC_ASC_KEY_OFFSET] = 0x0c; 2786 /* NOT ENOUGH UNSOLICITED DATA */ 2787 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d; 2788 break; 2789 case TCM_INVALID_CDB_FIELD: 2790 /* CURRENT ERROR */ 2791 buffer[0] = 0x70; 2792 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2793 /* ILLEGAL REQUEST */ 2794 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2795 /* INVALID FIELD IN CDB */ 2796 buffer[SPC_ASC_KEY_OFFSET] = 0x24; 2797 break; 2798 case TCM_INVALID_PARAMETER_LIST: 2799 /* CURRENT ERROR */ 2800 buffer[0] = 0x70; 2801 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2802 /* ILLEGAL REQUEST */ 2803 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2804 /* INVALID FIELD IN PARAMETER LIST */ 2805 buffer[SPC_ASC_KEY_OFFSET] = 0x26; 2806 break; 2807 case TCM_PARAMETER_LIST_LENGTH_ERROR: 2808 /* CURRENT ERROR */ 2809 buffer[0] = 0x70; 2810 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2811 /* ILLEGAL REQUEST */ 2812 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2813 /* PARAMETER LIST LENGTH ERROR */ 2814 buffer[SPC_ASC_KEY_OFFSET] = 0x1a; 2815 break; 2816 case TCM_UNEXPECTED_UNSOLICITED_DATA: 2817 /* CURRENT ERROR */ 2818 buffer[0] = 0x70; 2819 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2820 /* ABORTED COMMAND */ 2821 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2822 /* WRITE ERROR */ 2823 buffer[SPC_ASC_KEY_OFFSET] = 0x0c; 2824 /* UNEXPECTED_UNSOLICITED_DATA */ 2825 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c; 2826 break; 2827 case TCM_SERVICE_CRC_ERROR: 2828 /* CURRENT ERROR */ 2829 buffer[0] = 0x70; 2830 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2831 /* ABORTED COMMAND */ 2832 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2833 /* PROTOCOL SERVICE CRC ERROR */ 2834 buffer[SPC_ASC_KEY_OFFSET] = 0x47; 2835 /* N/A */ 2836 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05; 2837 break; 2838 case TCM_SNACK_REJECTED: 2839 /* CURRENT ERROR */ 2840 buffer[0] = 0x70; 2841 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2842 /* ABORTED COMMAND */ 2843 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; 2844 /* READ ERROR */ 2845 buffer[SPC_ASC_KEY_OFFSET] = 0x11; 2846 /* FAILED RETRANSMISSION REQUEST */ 2847 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13; 2848 break; 2849 case TCM_WRITE_PROTECTED: 2850 /* CURRENT ERROR */ 2851 buffer[0] = 0x70; 2852 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2853 /* DATA PROTECT */ 2854 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; 2855 /* WRITE PROTECTED */ 2856 buffer[SPC_ASC_KEY_OFFSET] = 0x27; 2857 break; 2858 case TCM_ADDRESS_OUT_OF_RANGE: 2859 /* CURRENT ERROR */ 2860 buffer[0] = 0x70; 2861 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2862 /* ILLEGAL REQUEST */ 2863 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2864 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */ 2865 buffer[SPC_ASC_KEY_OFFSET] = 0x21; 2866 break; 2867 case TCM_CHECK_CONDITION_UNIT_ATTENTION: 2868 /* CURRENT ERROR */ 2869 buffer[0] = 0x70; 2870 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2871 /* UNIT ATTENTION */ 2872 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; 2873 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); 2874 buffer[SPC_ASC_KEY_OFFSET] = asc; 2875 buffer[SPC_ASCQ_KEY_OFFSET] = ascq; 2876 break; 2877 case TCM_CHECK_CONDITION_NOT_READY: 2878 /* CURRENT ERROR */ 2879 buffer[0] = 0x70; 2880 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2881 /* Not Ready */ 2882 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; 2883 transport_get_sense_codes(cmd, &asc, &ascq); 2884 buffer[SPC_ASC_KEY_OFFSET] = asc; 2885 buffer[SPC_ASCQ_KEY_OFFSET] = ascq; 2886 break; 2887 case TCM_MISCOMPARE_VERIFY: 2888 /* CURRENT ERROR */ 2889 buffer[0] = 0x70; 2890 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2891 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE; 2892 /* MISCOMPARE DURING VERIFY OPERATION */ 2893 buffer[SPC_ASC_KEY_OFFSET] = 0x1d; 2894 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00; 2895 break; 2896 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED: 2897 /* CURRENT ERROR */ 2898 buffer[0] = 0x70; 2899 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2900 /* ILLEGAL REQUEST */ 2901 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2902 /* LOGICAL BLOCK GUARD CHECK FAILED */ 2903 buffer[SPC_ASC_KEY_OFFSET] = 0x10; 2904 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01; 2905 transport_err_sector_info(buffer, cmd->bad_sector); 2906 break; 2907 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED: 2908 /* CURRENT ERROR */ 2909 buffer[0] = 0x70; 2910 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2911 /* ILLEGAL REQUEST */ 2912 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2913 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */ 2914 buffer[SPC_ASC_KEY_OFFSET] = 0x10; 2915 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02; 2916 transport_err_sector_info(buffer, cmd->bad_sector); 2917 break; 2918 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED: 2919 /* CURRENT ERROR */ 2920 buffer[0] = 0x70; 2921 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2922 /* ILLEGAL REQUEST */ 2923 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; 2924 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */ 2925 buffer[SPC_ASC_KEY_OFFSET] = 0x10; 2926 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03; 2927 transport_err_sector_info(buffer, cmd->bad_sector); 2928 break; 2929 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: 2930 default: 2931 /* CURRENT ERROR */ 2932 buffer[0] = 0x70; 2933 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10; 2934 /* 2935 * Returning ILLEGAL REQUEST would cause immediate IO errors on 2936 * Solaris initiators. Returning NOT READY instead means the 2937 * operations will be retried a finite number of times and we 2938 * can survive intermittent errors. 2939 */ 2940 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY; 2941 /* LOGICAL UNIT COMMUNICATION FAILURE */ 2942 buffer[SPC_ASC_KEY_OFFSET] = 0x08; 2943 break; 2944 } 2945 /* 2946 * This code uses linux/include/scsi/scsi.h SAM status codes! 2947 */ 2948 cmd->scsi_status = SAM_STAT_CHECK_CONDITION; 2949 /* 2950 * Automatically padded, this value is encoded in the fabric's 2951 * data_length response PDU containing the SCSI defined sense data. 2952 */ 2953 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER; 2954 2955 after_reason: 2956 trace_target_cmd_complete(cmd); 2957 return cmd->se_tfo->queue_status(cmd); 2958 } 2959 EXPORT_SYMBOL(transport_send_check_condition_and_sense); 2960 2961 int transport_check_aborted_status(struct se_cmd *cmd, int send_status) 2962 { 2963 if (!(cmd->transport_state & CMD_T_ABORTED)) 2964 return 0; 2965 2966 /* 2967 * If cmd has been aborted but either no status is to be sent or it has 2968 * already been sent, just return 2969 */ 2970 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) 2971 return 1; 2972 2973 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n", 2974 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd)); 2975 2976 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS; 2977 cmd->scsi_status = SAM_STAT_TASK_ABORTED; 2978 trace_target_cmd_complete(cmd); 2979 cmd->se_tfo->queue_status(cmd); 2980 2981 return 1; 2982 } 2983 EXPORT_SYMBOL(transport_check_aborted_status); 2984 2985 void transport_send_task_abort(struct se_cmd *cmd) 2986 { 2987 unsigned long flags; 2988 2989 spin_lock_irqsave(&cmd->t_state_lock, flags); 2990 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) { 2991 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2992 return; 2993 } 2994 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2995 2996 /* 2997 * If there are still expected incoming fabric WRITEs, we wait 2998 * until until they have completed before sending a TASK_ABORTED 2999 * response. This response with TASK_ABORTED status will be 3000 * queued back to fabric module by transport_check_aborted_status(). 3001 */ 3002 if (cmd->data_direction == DMA_TO_DEVICE) { 3003 if (cmd->se_tfo->write_pending_status(cmd) != 0) { 3004 cmd->transport_state |= CMD_T_ABORTED; 3005 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS; 3006 return; 3007 } 3008 } 3009 cmd->scsi_status = SAM_STAT_TASK_ABORTED; 3010 3011 transport_lun_remove_cmd(cmd); 3012 3013 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," 3014 " ITT: 0x%08x\n", cmd->t_task_cdb[0], 3015 cmd->se_tfo->get_task_tag(cmd)); 3016 3017 trace_target_cmd_complete(cmd); 3018 cmd->se_tfo->queue_status(cmd); 3019 } 3020 3021 static void target_tmr_work(struct work_struct *work) 3022 { 3023 struct se_cmd *cmd = container_of(work, struct se_cmd, work); 3024 struct se_device *dev = cmd->se_dev; 3025 struct se_tmr_req *tmr = cmd->se_tmr_req; 3026 int ret; 3027 3028 switch (tmr->function) { 3029 case TMR_ABORT_TASK: 3030 core_tmr_abort_task(dev, tmr, cmd->se_sess); 3031 break; 3032 case TMR_ABORT_TASK_SET: 3033 case TMR_CLEAR_ACA: 3034 case TMR_CLEAR_TASK_SET: 3035 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; 3036 break; 3037 case TMR_LUN_RESET: 3038 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); 3039 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : 3040 TMR_FUNCTION_REJECTED; 3041 break; 3042 case TMR_TARGET_WARM_RESET: 3043 tmr->response = TMR_FUNCTION_REJECTED; 3044 break; 3045 case TMR_TARGET_COLD_RESET: 3046 tmr->response = TMR_FUNCTION_REJECTED; 3047 break; 3048 default: 3049 pr_err("Uknown TMR function: 0x%02x.\n", 3050 tmr->function); 3051 tmr->response = TMR_FUNCTION_REJECTED; 3052 break; 3053 } 3054 3055 cmd->t_state = TRANSPORT_ISTATE_PROCESSING; 3056 cmd->se_tfo->queue_tm_rsp(cmd); 3057 3058 transport_cmd_check_stop_to_fabric(cmd); 3059 } 3060 3061 int transport_generic_handle_tmr( 3062 struct se_cmd *cmd) 3063 { 3064 unsigned long flags; 3065 3066 spin_lock_irqsave(&cmd->t_state_lock, flags); 3067 cmd->transport_state |= CMD_T_ACTIVE; 3068 spin_unlock_irqrestore(&cmd->t_state_lock, flags); 3069 3070 INIT_WORK(&cmd->work, target_tmr_work); 3071 queue_work(cmd->se_dev->tmr_wq, &cmd->work); 3072 return 0; 3073 } 3074 EXPORT_SYMBOL(transport_generic_handle_tmr); 3075