Pileus Git - ~andy/linux/blob - drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <linux/ratelimit.h>
  41 #include <asm/unaligned.h>
  42 #include <net/sock.h>
  43 #include <net/tcp.h>
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50 #include <target/target_core_fabric.h>
  51 #include <target/target_core_configfs.h>
  52
  53 #include "target_core_internal.h"
  54 #include "target_core_alua.h"
  55 #include "target_core_pr.h"
  56 #include "target_core_ua.h"
  57
  58 static struct workqueue_struct *target_completion_wq;
  59 static struct kmem_cache *se_sess_cache;
  60 struct kmem_cache *se_ua_cache;
  61 struct kmem_cache *t10_pr_reg_cache;
  62 struct kmem_cache *t10_alua_lu_gp_cache;
  63 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  64 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  65 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  66
  67 static void transport_complete_task_attr(struct se_cmd *cmd);
  68 static void transport_handle_queue_full(struct se_cmd *cmd,
  69                 struct se_device *dev);
  70 static int transport_generic_get_mem(struct se_cmd *cmd);
  71 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
  72 static void transport_put_cmd(struct se_cmd *cmd);
  73 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  74 static void target_complete_ok_work(struct work_struct *work);
  75
  76 int init_se_kmem_caches(void)
  77 {
  78         se_sess_cache = kmem_cache_create("se_sess_cache",
  79                         sizeof(struct se_session), __alignof__(struct se_session),
  80                         0, NULL);
  81         if (!se_sess_cache) {
  82                 pr_err("kmem_cache_create() for struct se_session"
  83                                 " failed\n");
  84                 goto out;
  85         }
  86         se_ua_cache = kmem_cache_create("se_ua_cache",
  87                         sizeof(struct se_ua), __alignof__(struct se_ua),
  88                         0, NULL);
  89         if (!se_ua_cache) {
  90                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  91                 goto out_free_sess_cache;
  92         }
  93         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  94                         sizeof(struct t10_pr_registration),
  95                         __alignof__(struct t10_pr_registration), 0, NULL);
  96         if (!t10_pr_reg_cache) {
  97                 pr_err("kmem_cache_create() for struct t10_pr_registration"
  98                                 " failed\n");
  99                 goto out_free_ua_cache;
 100         }
 101         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 102                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 103                         0, NULL);
 104         if (!t10_alua_lu_gp_cache) {
 105                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 106                                 " failed\n");
 107                 goto out_free_pr_reg_cache;
 108         }
 109         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 110                         sizeof(struct t10_alua_lu_gp_member),
 111                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 112         if (!t10_alua_lu_gp_mem_cache) {
 113                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 114                                 "cache failed\n");
 115                 goto out_free_lu_gp_cache;
 116         }
 117         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 118                         sizeof(struct t10_alua_tg_pt_gp),
 119                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 120         if (!t10_alua_tg_pt_gp_cache) {
 121                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 122                                 "cache failed\n");
 123                 goto out_free_lu_gp_mem_cache;
 124         }
 125         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 126                         "t10_alua_tg_pt_gp_mem_cache",
 127                         sizeof(struct t10_alua_tg_pt_gp_member),
 128                         __alignof__(struct t10_alua_tg_pt_gp_member),
 129                         0, NULL);
 130         if (!t10_alua_tg_pt_gp_mem_cache) {
 131                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 132                                 "mem_t failed\n");
 133                 goto out_free_tg_pt_gp_cache;
 134         }
 135
 136         target_completion_wq = alloc_workqueue("target_completion",
 137                                                WQ_MEM_RECLAIM, 0);
 138         if (!target_completion_wq)
 139                 goto out_free_tg_pt_gp_mem_cache;
 140
 141         return 0;
 142
 143 out_free_tg_pt_gp_mem_cache:
 144         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 145 out_free_tg_pt_gp_cache:
 146         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 147 out_free_lu_gp_mem_cache:
 148         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 149 out_free_lu_gp_cache:
 150         kmem_cache_destroy(t10_alua_lu_gp_cache);
 151 out_free_pr_reg_cache:
 152         kmem_cache_destroy(t10_pr_reg_cache);
 153 out_free_ua_cache:
 154         kmem_cache_destroy(se_ua_cache);
 155 out_free_sess_cache:
 156         kmem_cache_destroy(se_sess_cache);
 157 out:
 158         return -ENOMEM;
 159 }
 160
 161 void release_se_kmem_caches(void)
 162 {
 163         destroy_workqueue(target_completion_wq);
 164         kmem_cache_destroy(se_sess_cache);
 165         kmem_cache_destroy(se_ua_cache);
 166         kmem_cache_destroy(t10_pr_reg_cache);
 167         kmem_cache_destroy(t10_alua_lu_gp_cache);
 168         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 169         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 170         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 171 }
 172
 173 /* This code ensures unique mib indexes are handed out. */
 174 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 175 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 176
 177 /*
 178  * Allocate a new row index for the entry type specified
 179  */
 180 u32 scsi_get_new_index(scsi_index_t type)
 181 {
 182         u32 new_index;
 183
 184         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 185
 186         spin_lock(&scsi_mib_index_lock);
 187         new_index = ++scsi_mib_index[type];
 188         spin_unlock(&scsi_mib_index_lock);
 189
 190         return new_index;
 191 }
 192
 193 void transport_subsystem_check_init(void)
 194 {
 195         int ret;
 196         static int sub_api_initialized;
 197
 198         if (sub_api_initialized)
 199                 return;
 200
 201         ret = request_module("target_core_iblock");
 202         if (ret != 0)
 203                 pr_err("Unable to load target_core_iblock\n");
 204
 205         ret = request_module("target_core_file");
 206         if (ret != 0)
 207                 pr_err("Unable to load target_core_file\n");
 208
 209         ret = request_module("target_core_pscsi");
 210         if (ret != 0)
 211                 pr_err("Unable to load target_core_pscsi\n");
 212
 213         sub_api_initialized = 1;
 214 }
 215
 216 struct se_session *transport_init_session(void)
 217 {
 218         struct se_session *se_sess;
 219
 220         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 221         if (!se_sess) {
 222                 pr_err("Unable to allocate struct se_session from"
 223                                 " se_sess_cache\n");
 224                 return ERR_PTR(-ENOMEM);
 225         }
 226         INIT_LIST_HEAD(&se_sess->sess_list);
 227         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 228         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 229         spin_lock_init(&se_sess->sess_cmd_lock);
 230         kref_init(&se_sess->sess_kref);
 231
 232         return se_sess;
 233 }
 234 EXPORT_SYMBOL(transport_init_session);
 235
 236 /*
 237  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 238  */
 239 void __transport_register_session(
 240         struct se_portal_group *se_tpg,
 241         struct se_node_acl *se_nacl,
 242         struct se_session *se_sess,
 243         void *fabric_sess_ptr)
 244 {
 245         unsigned char buf[PR_REG_ISID_LEN];
 246
 247         se_sess->se_tpg = se_tpg;
 248         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 249         /*
 250          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 251          *
 252          * Only set for struct se_session's that will actually be moving I/O.
 253          * eg: *NOT* discovery sessions.
 254          */
 255         if (se_nacl) {
 256                 /*
 257                  * If the fabric module supports an ISID based TransportID,
 258                  * save this value in binary from the fabric I_T Nexus now.
 259                  */
 260                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 261                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 262                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 263                                         &buf[0], PR_REG_ISID_LEN);
 264                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 265                 }
 266                 kref_get(&se_nacl->acl_kref);
 267
 268                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 269                 /*
 270                  * The se_nacl->nacl_sess pointer will be set to the
 271                  * last active I_T Nexus for each struct se_node_acl.
 272                  */
 273                 se_nacl->nacl_sess = se_sess;
 274
 275                 list_add_tail(&se_sess->sess_acl_list,
 276                               &se_nacl->acl_sess_list);
 277                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 278         }
 279         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 280
 281         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 282                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 283 }
 284 EXPORT_SYMBOL(__transport_register_session);
 285
 286 void transport_register_session(
 287         struct se_portal_group *se_tpg,
 288         struct se_node_acl *se_nacl,
 289         struct se_session *se_sess,
 290         void *fabric_sess_ptr)
 291 {
 292         unsigned long flags;
 293
 294         spin_lock_irqsave(&se_tpg->session_lock, flags);
 295         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 296         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 297 }
 298 EXPORT_SYMBOL(transport_register_session);
 299
 300 void target_release_session(struct kref *kref)
 301 {
 302         struct se_session *se_sess = container_of(kref,
 303                         struct se_session, sess_kref);
 304         struct se_portal_group *se_tpg = se_sess->se_tpg;
 305
 306         se_tpg->se_tpg_tfo->close_session(se_sess);
 307 }
 308
 309 void target_get_session(struct se_session *se_sess)
 310 {
 311         kref_get(&se_sess->sess_kref);
 312 }
 313 EXPORT_SYMBOL(target_get_session);
 314
 315 void target_put_session(struct se_session *se_sess)
 316 {
 317         struct se_portal_group *tpg = se_sess->se_tpg;
 318
 319         if (tpg->se_tpg_tfo->put_session != NULL) {
 320                 tpg->se_tpg_tfo->put_session(se_sess);
 321                 return;
 322         }
 323         kref_put(&se_sess->sess_kref, target_release_session);
 324 }
 325 EXPORT_SYMBOL(target_put_session);
 326
 327 static void target_complete_nacl(struct kref *kref)
 328 {
 329         struct se_node_acl *nacl = container_of(kref,
 330                                 struct se_node_acl, acl_kref);
 331
 332         complete(&nacl->acl_free_comp);
 333 }
 334
 335 void target_put_nacl(struct se_node_acl *nacl)
 336 {
 337         kref_put(&nacl->acl_kref, target_complete_nacl);
 338 }
 339
 340 void transport_deregister_session_configfs(struct se_session *se_sess)
 341 {
 342         struct se_node_acl *se_nacl;
 343         unsigned long flags;
 344         /*
 345          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 346          */
 347         se_nacl = se_sess->se_node_acl;
 348         if (se_nacl) {
 349                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 350                 if (se_nacl->acl_stop == 0)
 351                         list_del(&se_sess->sess_acl_list);
 352                 /*
 353                  * If the session list is empty, then clear the pointer.
 354                  * Otherwise, set the struct se_session pointer from the tail
 355                  * element of the per struct se_node_acl active session list.
 356                  */
 357                 if (list_empty(&se_nacl->acl_sess_list))
 358                         se_nacl->nacl_sess = NULL;
 359                 else {
 360                         se_nacl->nacl_sess = container_of(
 361                                         se_nacl->acl_sess_list.prev,
 362                                         struct se_session, sess_acl_list);
 363                 }
 364                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 365         }
 366 }
 367 EXPORT_SYMBOL(transport_deregister_session_configfs);
 368
 369 void transport_free_session(struct se_session *se_sess)
 370 {
 371         kmem_cache_free(se_sess_cache, se_sess);
 372 }
 373 EXPORT_SYMBOL(transport_free_session);
 374
 375 void transport_deregister_session(struct se_session *se_sess)
 376 {
 377         struct se_portal_group *se_tpg = se_sess->se_tpg;
 378         struct target_core_fabric_ops *se_tfo;
 379         struct se_node_acl *se_nacl;
 380         unsigned long flags;
 381         bool comp_nacl = true;
 382
 383         if (!se_tpg) {
 384                 transport_free_session(se_sess);
 385                 return;
 386         }
 387         se_tfo = se_tpg->se_tpg_tfo;
 388
 389         spin_lock_irqsave(&se_tpg->session_lock, flags);
 390         list_del(&se_sess->sess_list);
 391         se_sess->se_tpg = NULL;
 392         se_sess->fabric_sess_ptr = NULL;
 393         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 394
 395         /*
 396          * Determine if we need to do extra work for this initiator node's
 397          * struct se_node_acl if it had been previously dynamically generated.
 398          */
 399         se_nacl = se_sess->se_node_acl;
 400
 401         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 402         if (se_nacl && se_nacl->dynamic_node_acl) {
 403                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 404                         list_del(&se_nacl->acl_list);
 405                         se_tpg->num_node_acls--;
 406                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 407                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 408                         core_free_device_list_for_node(se_nacl, se_tpg);
 409                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 410
 411                         comp_nacl = false;
 412                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 413                 }
 414         }
 415         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 416
 417         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 418                 se_tpg->se_tpg_tfo->get_fabric_name());
 419         /*
 420          * If last kref is dropping now for an explict NodeACL, awake sleeping
 421          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 422          * removal context.
 423          */
 424         if (se_nacl && comp_nacl == true)
 425                 target_put_nacl(se_nacl);
 426
 427         transport_free_session(se_sess);
 428 }
 429 EXPORT_SYMBOL(transport_deregister_session);
 430
 431 /*
 432  * Called with cmd->t_state_lock held.
 433  */
 434 static void target_remove_from_state_list(struct se_cmd *cmd)
 435 {
 436         struct se_device *dev = cmd->se_dev;
 437         unsigned long flags;
 438
 439         if (!dev)
 440                 return;
 441
 442         if (cmd->transport_state & CMD_T_BUSY)
 443                 return;
 444
 445         spin_lock_irqsave(&dev->execute_task_lock, flags);
 446         if (cmd->state_active) {
 447                 list_del(&cmd->state_list);
 448                 cmd->state_active = false;
 449         }
 450         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 451 }
 452
 453 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 454 {
 455         unsigned long flags;
 456
 457         spin_lock_irqsave(&cmd->t_state_lock, flags);
 458         /*
 459          * Determine if IOCTL context caller in requesting the stopping of this
 460          * command for LUN shutdown purposes.
 461          */
 462         if (cmd->transport_state & CMD_T_LUN_STOP) {
 463                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 464                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 465
 466                 cmd->transport_state &= ~CMD_T_ACTIVE;
 467                 if (remove_from_lists)
 468                         target_remove_from_state_list(cmd);
 469                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 470
 471                 complete(&cmd->transport_lun_stop_comp);
 472                 return 1;
 473         }
 474
 475         if (remove_from_lists) {
 476                 target_remove_from_state_list(cmd);
 477
 478                 /*
 479                  * Clear struct se_cmd->se_lun before the handoff to FE.
 480                  */
 481                 cmd->se_lun = NULL;
 482         }
 483
 484         /*
 485          * Determine if frontend context caller is requesting the stopping of
 486          * this command for frontend exceptions.
 487          */
 488         if (cmd->transport_state & CMD_T_STOP) {
 489                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 490                         __func__, __LINE__,
 491                         cmd->se_tfo->get_task_tag(cmd));
 492
 493                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 494
 495                 complete(&cmd->t_transport_stop_comp);
 496                 return 1;
 497         }
 498
 499         cmd->transport_state &= ~CMD_T_ACTIVE;
 500         if (remove_from_lists) {
 501                 /*
 502                  * Some fabric modules like tcm_loop can release
 503                  * their internally allocated I/O reference now and
 504                  * struct se_cmd now.
 505                  *
 506                  * Fabric modules are expected to return '1' here if the
 507                  * se_cmd being passed is released at this point,
 508                  * or zero if not being released.
 509                  */
 510                 if (cmd->se_tfo->check_stop_free != NULL) {
 511                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 512                         return cmd->se_tfo->check_stop_free(cmd);
 513                 }
 514         }
 515
 516         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 517         return 0;
 518 }
 519
 520 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 521 {
 522         return transport_cmd_check_stop(cmd, true);
 523 }
 524
 525 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 526 {
 527         struct se_lun *lun = cmd->se_lun;
 528         unsigned long flags;
 529
 530         if (!lun)
 531                 return;
 532
 533         spin_lock_irqsave(&cmd->t_state_lock, flags);
 534         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 535                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 536                 target_remove_from_state_list(cmd);
 537         }
 538         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 539
 540         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 541         if (!list_empty(&cmd->se_lun_node))
 542                 list_del_init(&cmd->se_lun_node);
 543         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 544 }
 545
 546 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 547 {
 548         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 549                 transport_lun_remove_cmd(cmd);
 550
 551         if (transport_cmd_check_stop_to_fabric(cmd))
 552                 return;
 553         if (remove)
 554                 transport_put_cmd(cmd);
 555 }
 556
 557 static void target_complete_failure_work(struct work_struct *work)
 558 {
 559         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 560
 561         transport_generic_request_failure(cmd);
 562 }
 563
 564 /*
 565  * Used when asking transport to copy Sense Data from the underlying
 566  * Linux/SCSI struct scsi_cmnd
 567  */
 568 static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 569 {
 570         struct se_device *dev = cmd->se_dev;
 571
 572         WARN_ON(!cmd->se_lun);
 573
 574         if (!dev)
 575                 return NULL;
 576
 577         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 578                 return NULL;
 579
 580         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
 581
 582         pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
 583                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 584         return cmd->sense_buffer;
 585 }
 586
 587 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 588 {
 589         struct se_device *dev = cmd->se_dev;
 590         int success = scsi_status == GOOD;
 591         unsigned long flags;
 592
 593         cmd->scsi_status = scsi_status;
 594
 595
 596         spin_lock_irqsave(&cmd->t_state_lock, flags);
 597         cmd->transport_state &= ~CMD_T_BUSY;
 598
 599         if (dev && dev->transport->transport_complete) {
 600                 dev->transport->transport_complete(cmd,
 601                                 cmd->t_data_sg,
 602                                 transport_get_sense_buffer(cmd));
 603                 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
 604                         success = 1;
 605         }
 606
 607         /*
 608          * See if we are waiting to complete for an exception condition.
 609          */
 610         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 611                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 612                 complete(&cmd->task_stop_comp);
 613                 return;
 614         }
 615
 616         if (!success)
 617                 cmd->transport_state |= CMD_T_FAILED;
 618
 619         /*
 620          * Check for case where an explict ABORT_TASK has been received
 621          * and transport_wait_for_tasks() will be waiting for completion..
 622          */
 623         if (cmd->transport_state & CMD_T_ABORTED &&
 624             cmd->transport_state & CMD_T_STOP) {
 625                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 626                 complete(&cmd->t_transport_stop_comp);
 627                 return;
 628         } else if (cmd->transport_state & CMD_T_FAILED) {
 629                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 630                 INIT_WORK(&cmd->work, target_complete_failure_work);
 631         } else {
 632                 INIT_WORK(&cmd->work, target_complete_ok_work);
 633         }
 634
 635         cmd->t_state = TRANSPORT_COMPLETE;
 636         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 637         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 638
 639         queue_work(target_completion_wq, &cmd->work);
 640 }
 641 EXPORT_SYMBOL(target_complete_cmd);
 642
 643 static void target_add_to_state_list(struct se_cmd *cmd)
 644 {
 645         struct se_device *dev = cmd->se_dev;
 646         unsigned long flags;
 647
 648         spin_lock_irqsave(&dev->execute_task_lock, flags);
 649         if (!cmd->state_active) {
 650                 list_add_tail(&cmd->state_list, &dev->state_list);
 651                 cmd->state_active = true;
 652         }
 653         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 654 }
 655
 656 /*
 657  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 658  */
 659 static void transport_write_pending_qf(struct se_cmd *cmd);
 660 static void transport_complete_qf(struct se_cmd *cmd);
 661
 662 static void target_qf_do_work(struct work_struct *work)
 663 {
 664         struct se_device *dev = container_of(work, struct se_device,
 665                                         qf_work_queue);
 666         LIST_HEAD(qf_cmd_list);
 667         struct se_cmd *cmd, *cmd_tmp;
 668
 669         spin_lock_irq(&dev->qf_cmd_lock);
 670         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 671         spin_unlock_irq(&dev->qf_cmd_lock);
 672
 673         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 674                 list_del(&cmd->se_qf_node);
 675                 atomic_dec(&dev->dev_qf_count);
 676                 smp_mb__after_atomic_dec();
 677
 678                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 679                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 680                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 681                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 682                         : "UNKNOWN");
 683
 684                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 685                         transport_write_pending_qf(cmd);
 686                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 687                         transport_complete_qf(cmd);
 688         }
 689 }
 690
 691 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 692 {
 693         switch (cmd->data_direction) {
 694         case DMA_NONE:
 695                 return "NONE";
 696         case DMA_FROM_DEVICE:
 697                 return "READ";
 698         case DMA_TO_DEVICE:
 699                 return "WRITE";
 700         case DMA_BIDIRECTIONAL:
 701                 return "BIDI";
 702         default:
 703                 break;
 704         }
 705
 706         return "UNKNOWN";
 707 }
 708
 709 void transport_dump_dev_state(
 710         struct se_device *dev,
 711         char *b,
 712         int *bl)
 713 {
 714         *bl += sprintf(b + *bl, "Status: ");
 715         switch (dev->dev_status) {
 716         case TRANSPORT_DEVICE_ACTIVATED:
 717                 *bl += sprintf(b + *bl, "ACTIVATED");
 718                 break;
 719         case TRANSPORT_DEVICE_DEACTIVATED:
 720                 *bl += sprintf(b + *bl, "DEACTIVATED");
 721                 break;
 722         case TRANSPORT_DEVICE_SHUTDOWN:
 723                 *bl += sprintf(b + *bl, "SHUTDOWN");
 724                 break;
 725         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 726         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 727                 *bl += sprintf(b + *bl, "OFFLINE");
 728                 break;
 729         default:
 730                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 731                 break;
 732         }
 733
 734         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 735         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 736                 dev->se_sub_dev->se_dev_attrib.block_size,
 737                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 738         *bl += sprintf(b + *bl, "        ");
 739 }
 740
 741 void transport_dump_vpd_proto_id(
 742         struct t10_vpd *vpd,
 743         unsigned char *p_buf,
 744         int p_buf_len)
 745 {
 746         unsigned char buf[VPD_TMP_BUF_SIZE];
 747         int len;
 748
 749         memset(buf, 0, VPD_TMP_BUF_SIZE);
 750         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 751
 752         switch (vpd->protocol_identifier) {
 753         case 0x00:
 754                 sprintf(buf+len, "Fibre Channel\n");
 755                 break;
 756         case 0x10:
 757                 sprintf(buf+len, "Parallel SCSI\n");
 758                 break;
 759         case 0x20:
 760                 sprintf(buf+len, "SSA\n");
 761                 break;
 762         case 0x30:
 763                 sprintf(buf+len, "IEEE 1394\n");
 764                 break;
 765         case 0x40:
 766                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 767                                 " Protocol\n");
 768                 break;
 769         case 0x50:
 770                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 771                 break;
 772         case 0x60:
 773                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 774                 break;
 775         case 0x70:
 776                 sprintf(buf+len, "Automation/Drive Interface Transport"
 777                                 " Protocol\n");
 778                 break;
 779         case 0x80:
 780                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 781                 break;
 782         default:
 783                 sprintf(buf+len, "Unknown 0x%02x\n",
 784                                 vpd->protocol_identifier);
 785                 break;
 786         }
 787
 788         if (p_buf)
 789                 strncpy(p_buf, buf, p_buf_len);
 790         else
 791                 pr_debug("%s", buf);
 792 }
 793
 794 void
 795 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 796 {
 797         /*
 798          * Check if the Protocol Identifier Valid (PIV) bit is set..
 799          *
 800          * from spc3r23.pdf section 7.5.1
 801          */
 802          if (page_83[1] & 0x80) {
 803                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 804                 vpd->protocol_identifier_set = 1;
 805                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 806         }
 807 }
 808 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 809
 810 int transport_dump_vpd_assoc(
 811         struct t10_vpd *vpd,
 812         unsigned char *p_buf,
 813         int p_buf_len)
 814 {
 815         unsigned char buf[VPD_TMP_BUF_SIZE];
 816         int ret = 0;
 817         int len;
 818
 819         memset(buf, 0, VPD_TMP_BUF_SIZE);
 820         len = sprintf(buf, "T10 VPD Identifier Association: ");
 821
 822         switch (vpd->association) {
 823         case 0x00:
 824                 sprintf(buf+len, "addressed logical unit\n");
 825                 break;
 826         case 0x10:
 827                 sprintf(buf+len, "target port\n");
 828                 break;
 829         case 0x20:
 830                 sprintf(buf+len, "SCSI target device\n");
 831                 break;
 832         default:
 833                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 834                 ret = -EINVAL;
 835                 break;
 836         }
 837
 838         if (p_buf)
 839                 strncpy(p_buf, buf, p_buf_len);
 840         else
 841                 pr_debug("%s", buf);
 842
 843         return ret;
 844 }
 845
 846 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 847 {
 848         /*
 849          * The VPD identification association..
 850          *
 851          * from spc3r23.pdf Section 7.6.3.1 Table 297
 852          */
 853         vpd->association = (page_83[1] & 0x30);
 854         return transport_dump_vpd_assoc(vpd, NULL, 0);
 855 }
 856 EXPORT_SYMBOL(transport_set_vpd_assoc);
 857
 858 int transport_dump_vpd_ident_type(
 859         struct t10_vpd *vpd,
 860         unsigned char *p_buf,
 861         int p_buf_len)
 862 {
 863         unsigned char buf[VPD_TMP_BUF_SIZE];
 864         int ret = 0;
 865         int len;
 866
 867         memset(buf, 0, VPD_TMP_BUF_SIZE);
 868         len = sprintf(buf, "T10 VPD Identifier Type: ");
 869
 870         switch (vpd->device_identifier_type) {
 871         case 0x00:
 872                 sprintf(buf+len, "Vendor specific\n");
 873                 break;
 874         case 0x01:
 875                 sprintf(buf+len, "T10 Vendor ID based\n");
 876                 break;
 877         case 0x02:
 878                 sprintf(buf+len, "EUI-64 based\n");
 879                 break;
 880         case 0x03:
 881                 sprintf(buf+len, "NAA\n");
 882                 break;
 883         case 0x04:
 884                 sprintf(buf+len, "Relative target port identifier\n");
 885                 break;
 886         case 0x08:
 887                 sprintf(buf+len, "SCSI name string\n");
 888                 break;
 889         default:
 890                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 891                                 vpd->device_identifier_type);
 892                 ret = -EINVAL;
 893                 break;
 894         }
 895
 896         if (p_buf) {
 897                 if (p_buf_len < strlen(buf)+1)
 898                         return -EINVAL;
 899                 strncpy(p_buf, buf, p_buf_len);
 900         } else {
 901                 pr_debug("%s", buf);
 902         }
 903
 904         return ret;
 905 }
 906
 907 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 908 {
 909         /*
 910          * The VPD identifier type..
 911          *
 912          * from spc3r23.pdf Section 7.6.3.1 Table 298
 913          */
 914         vpd->device_identifier_type = (page_83[1] & 0x0f);
 915         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 916 }
 917 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 918
 919 int transport_dump_vpd_ident(
 920         struct t10_vpd *vpd,
 921         unsigned char *p_buf,
 922         int p_buf_len)
 923 {
 924         unsigned char buf[VPD_TMP_BUF_SIZE];
 925         int ret = 0;
 926
 927         memset(buf, 0, VPD_TMP_BUF_SIZE);
 928
 929         switch (vpd->device_identifier_code_set) {
 930         case 0x01: /* Binary */
 931                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 932                         &vpd->device_identifier[0]);
 933                 break;
 934         case 0x02: /* ASCII */
 935                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 936                         &vpd->device_identifier[0]);
 937                 break;
 938         case 0x03: /* UTF-8 */
 939                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 940                         &vpd->device_identifier[0]);
 941                 break;
 942         default:
 943                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 944                         " 0x%02x", vpd->device_identifier_code_set);
 945                 ret = -EINVAL;
 946                 break;
 947         }
 948
 949         if (p_buf)
 950                 strncpy(p_buf, buf, p_buf_len);
 951         else
 952                 pr_debug("%s", buf);
 953
 954         return ret;
 955 }
 956
 957 int
 958 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 959 {
 960         static const char hex_str[] = "0123456789abcdef";
 961         int j = 0, i = 4; /* offset to start of the identifier */
 962
 963         /*
 964          * The VPD Code Set (encoding)
 965          *
 966          * from spc3r23.pdf Section 7.6.3.1 Table 296
 967          */
 968         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
 969         switch (vpd->device_identifier_code_set) {
 970         case 0x01: /* Binary */
 971                 vpd->device_identifier[j++] =
 972                                 hex_str[vpd->device_identifier_type];
 973                 while (i < (4 + page_83[3])) {
 974                         vpd->device_identifier[j++] =
 975                                 hex_str[(page_83[i] & 0xf0) >> 4];
 976                         vpd->device_identifier[j++] =
 977                                 hex_str[page_83[i] & 0x0f];
 978                         i++;
 979                 }
 980                 break;
 981         case 0x02: /* ASCII */
 982         case 0x03: /* UTF-8 */
 983                 while (i < (4 + page_83[3]))
 984                         vpd->device_identifier[j++] = page_83[i++];
 985                 break;
 986         default:
 987                 break;
 988         }
 989
 990         return transport_dump_vpd_ident(vpd, NULL, 0);
 991 }
 992 EXPORT_SYMBOL(transport_set_vpd_ident);
 993
 994 static void core_setup_task_attr_emulation(struct se_device *dev)
 995 {
 996         /*
 997          * If this device is from Target_Core_Mod/pSCSI, disable the
 998          * SAM Task Attribute emulation.
 999          *
1000          * This is currently not available in upsream Linux/SCSI Target
1001          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1002          */
1003         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1004                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1005                 return;
1006         }
1007
1008         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1009         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1010                 " device\n", dev->transport->name,
1011                 dev->transport->get_device_rev(dev));
1012 }
1013
1014 static void scsi_dump_inquiry(struct se_device *dev)
1015 {
1016         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1017         char buf[17];
1018         int i, device_type;
1019         /*
1020          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1021          */
1022         for (i = 0; i < 8; i++)
1023                 if (wwn->vendor[i] >= 0x20)
1024                         buf[i] = wwn->vendor[i];
1025                 else
1026                         buf[i] = ' ';
1027         buf[i] = '\0';
1028         pr_debug("  Vendor: %s\n", buf);
1029
1030         for (i = 0; i < 16; i++)
1031                 if (wwn->model[i] >= 0x20)
1032                         buf[i] = wwn->model[i];
1033                 else
1034                         buf[i] = ' ';
1035         buf[i] = '\0';
1036         pr_debug("  Model: %s\n", buf);
1037
1038         for (i = 0; i < 4; i++)
1039                 if (wwn->revision[i] >= 0x20)
1040                         buf[i] = wwn->revision[i];
1041                 else
1042                         buf[i] = ' ';
1043         buf[i] = '\0';
1044         pr_debug("  Revision: %s\n", buf);
1045
1046         device_type = dev->transport->get_device_type(dev);
1047         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1048         pr_debug("                 ANSI SCSI revision: %02x\n",
1049                                 dev->transport->get_device_rev(dev));
1050 }
1051
1052 struct se_device *transport_add_device_to_core_hba(
1053         struct se_hba *hba,
1054         struct se_subsystem_api *transport,
1055         struct se_subsystem_dev *se_dev,
1056         u32 device_flags,
1057         void *transport_dev,
1058         struct se_dev_limits *dev_limits,
1059         const char *inquiry_prod,
1060         const char *inquiry_rev)
1061 {
1062         int force_pt;
1063         struct se_device  *dev;
1064
1065         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1066         if (!dev) {
1067                 pr_err("Unable to allocate memory for se_dev_t\n");
1068                 return NULL;
1069         }
1070
1071         dev->dev_flags          = device_flags;
1072         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1073         dev->dev_ptr            = transport_dev;
1074         dev->se_hba             = hba;
1075         dev->se_sub_dev         = se_dev;
1076         dev->transport          = transport;
1077         INIT_LIST_HEAD(&dev->dev_list);
1078         INIT_LIST_HEAD(&dev->dev_sep_list);
1079         INIT_LIST_HEAD(&dev->dev_tmr_list);
1080         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1081         INIT_LIST_HEAD(&dev->state_list);
1082         INIT_LIST_HEAD(&dev->qf_cmd_list);
1083         spin_lock_init(&dev->execute_task_lock);
1084         spin_lock_init(&dev->delayed_cmd_lock);
1085         spin_lock_init(&dev->dev_reservation_lock);
1086         spin_lock_init(&dev->dev_status_lock);
1087         spin_lock_init(&dev->se_port_lock);
1088         spin_lock_init(&dev->se_tmr_lock);
1089         spin_lock_init(&dev->qf_cmd_lock);
1090         atomic_set(&dev->dev_ordered_id, 0);
1091
1092         se_dev_set_default_attribs(dev, dev_limits);
1093
1094         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1095         dev->creation_time = get_jiffies_64();
1096         spin_lock_init(&dev->stats_lock);
1097
1098         spin_lock(&hba->device_lock);
1099         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1100         hba->dev_count++;
1101         spin_unlock(&hba->device_lock);
1102         /*
1103          * Setup the SAM Task Attribute emulation for struct se_device
1104          */
1105         core_setup_task_attr_emulation(dev);
1106         /*
1107          * Force PR and ALUA passthrough emulation with internal object use.
1108          */
1109         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1110         /*
1111          * Setup the Reservations infrastructure for struct se_device
1112          */
1113         core_setup_reservations(dev, force_pt);
1114         /*
1115          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1116          */
1117         if (core_setup_alua(dev, force_pt) < 0)
1118                 goto err_dev_list;
1119
1120         /*
1121          * Startup the struct se_device processing thread
1122          */
1123         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1124                                       dev->transport->name);
1125         if (!dev->tmr_wq) {
1126                 pr_err("Unable to create tmr workqueue for %s\n",
1127                         dev->transport->name);
1128                 goto err_dev_list;
1129         }
1130         /*
1131          * Setup work_queue for QUEUE_FULL
1132          */
1133         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1134         /*
1135          * Preload the initial INQUIRY const values if we are doing
1136          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1137          * passthrough because this is being provided by the backend LLD.
1138          * This is required so that transport_get_inquiry() copies these
1139          * originals once back into DEV_T10_WWN(dev) for the virtual device
1140          * setup.
1141          */
1142         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1143                 if (!inquiry_prod || !inquiry_rev) {
1144                         pr_err("All non TCM/pSCSI plugins require"
1145                                 " INQUIRY consts\n");
1146                         goto err_wq;
1147                 }
1148
1149                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1150                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1151                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1152         }
1153         scsi_dump_inquiry(dev);
1154
1155         return dev;
1156
1157 err_wq:
1158         destroy_workqueue(dev->tmr_wq);
1159 err_dev_list:
1160         spin_lock(&hba->device_lock);
1161         list_del(&dev->dev_list);
1162         hba->dev_count--;
1163         spin_unlock(&hba->device_lock);
1164
1165         se_release_vpd_for_dev(dev);
1166
1167         kfree(dev);
1168
1169         return NULL;
1170 }
1171 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1172
1173 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1174 {
1175         struct se_device *dev = cmd->se_dev;
1176
1177         if (cmd->unknown_data_length) {
1178                 cmd->data_length = size;
1179         } else if (size != cmd->data_length) {
1180                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1181                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1182                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1183                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1184
1185                 if (cmd->data_direction == DMA_TO_DEVICE) {
1186                         pr_err("Rejecting underflow/overflow"
1187                                         " WRITE data\n");
1188                         goto out_invalid_cdb_field;
1189                 }
1190                 /*
1191                  * Reject READ_* or WRITE_* with overflow/underflow for
1192                  * type SCF_SCSI_DATA_CDB.
1193                  */
1194                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1195                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1196                                 " CDB on non 512-byte sector setup subsystem"
1197                                 " plugin: %s\n", dev->transport->name);
1198                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1199                         goto out_invalid_cdb_field;
1200                 }
1201                 /*
1202                  * For the overflow case keep the existing fabric provided
1203                  * ->data_length.  Otherwise for the underflow case, reset
1204                  * ->data_length to the smaller SCSI expected data transfer
1205                  * length.
1206                  */
1207                 if (size > cmd->data_length) {
1208                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1209                         cmd->residual_count = (size - cmd->data_length);
1210                 } else {
1211                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1212                         cmd->residual_count = (cmd->data_length - size);
1213                         cmd->data_length = size;
1214                 }
1215         }
1216
1217         return 0;
1218
1219 out_invalid_cdb_field:
1220         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1221         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1222         return -EINVAL;
1223 }
1224
1225 /*
1226  * Used by fabric modules containing a local struct se_cmd within their
1227  * fabric dependent per I/O descriptor.
1228  */
1229 void transport_init_se_cmd(
1230         struct se_cmd *cmd,
1231         struct target_core_fabric_ops *tfo,
1232         struct se_session *se_sess,
1233         u32 data_length,
1234         int data_direction,
1235         int task_attr,
1236         unsigned char *sense_buffer)
1237 {
1238         INIT_LIST_HEAD(&cmd->se_lun_node);
1239         INIT_LIST_HEAD(&cmd->se_delayed_node);
1240         INIT_LIST_HEAD(&cmd->se_qf_node);
1241         INIT_LIST_HEAD(&cmd->se_cmd_list);
1242         INIT_LIST_HEAD(&cmd->state_list);
1243         init_completion(&cmd->transport_lun_fe_stop_comp);
1244         init_completion(&cmd->transport_lun_stop_comp);
1245         init_completion(&cmd->t_transport_stop_comp);
1246         init_completion(&cmd->cmd_wait_comp);
1247         init_completion(&cmd->task_stop_comp);
1248         spin_lock_init(&cmd->t_state_lock);
1249         cmd->transport_state = CMD_T_DEV_ACTIVE;
1250
1251         cmd->se_tfo = tfo;
1252         cmd->se_sess = se_sess;
1253         cmd->data_length = data_length;
1254         cmd->data_direction = data_direction;
1255         cmd->sam_task_attr = task_attr;
1256         cmd->sense_buffer = sense_buffer;
1257
1258         cmd->state_active = false;
1259 }
1260 EXPORT_SYMBOL(transport_init_se_cmd);
1261
1262 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1263 {
1264         /*
1265          * Check if SAM Task Attribute emulation is enabled for this
1266          * struct se_device storage object
1267          */
1268         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1269                 return 0;
1270
1271         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1272                 pr_debug("SAM Task Attribute ACA"
1273                         " emulation is not supported\n");
1274                 return -EINVAL;
1275         }
1276         /*
1277          * Used to determine when ORDERED commands should go from
1278          * Dormant to Active status.
1279          */
1280         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1281         smp_mb__after_atomic_inc();
1282         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1283                         cmd->se_ordered_id, cmd->sam_task_attr,
1284                         cmd->se_dev->transport->name);
1285         return 0;
1286 }
1287
1288 /*      target_setup_cmd_from_cdb():
1289  *
1290  *      Called from fabric RX Thread.
1291  */
1292 int target_setup_cmd_from_cdb(
1293         struct se_cmd *cmd,
1294         unsigned char *cdb)
1295 {
1296         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1297         u32 pr_reg_type = 0;
1298         u8 alua_ascq = 0;
1299         unsigned long flags;
1300         int ret;
1301
1302         /*
1303          * Ensure that the received CDB is less than the max (252 + 8) bytes
1304          * for VARIABLE_LENGTH_CMD
1305          */
1306         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1307                 pr_err("Received SCSI CDB with command_size: %d that"
1308                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1309                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1310                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1311                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1312                 return -EINVAL;
1313         }
1314         /*
1315          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1316          * allocate the additional extended CDB buffer now..  Otherwise
1317          * setup the pointer from __t_task_cdb to t_task_cdb.
1318          */
1319         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1320                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1321                                                 GFP_KERNEL);
1322                 if (!cmd->t_task_cdb) {
1323                         pr_err("Unable to allocate cmd->t_task_cdb"
1324                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1325                                 scsi_command_size(cdb),
1326                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1327                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1328                         cmd->scsi_sense_reason =
1329                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1330                         return -ENOMEM;
1331                 }
1332         } else
1333                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1334         /*
1335          * Copy the original CDB into cmd->
1336          */
1337         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1338
1339         /*
1340          * Check for an existing UNIT ATTENTION condition
1341          */
1342         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1343                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1344                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1345                 return -EINVAL;
1346         }
1347
1348         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1349         if (ret != 0) {
1350                 /*
1351                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1352                  * The ALUA additional sense code qualifier (ASCQ) is determined
1353                  * by the ALUA primary or secondary access state..
1354                  */
1355                 if (ret > 0) {
1356                         pr_debug("[%s]: ALUA TG Port not available, "
1357                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1358                                 "0x04/0x%02x\n",
1359                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1360
1361                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1362                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1363                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1364                         return -EINVAL;
1365                 }
1366                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1367                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1368                 return -EINVAL;
1369         }
1370
1371         /*
1372          * Check status for SPC-3 Persistent Reservations
1373          */
1374         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1375                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1376                                         cmd, cdb, pr_reg_type) != 0) {
1377                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1378                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1379                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1380                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1381                         return -EBUSY;
1382                 }
1383                 /*
1384                  * This means the CDB is allowed for the SCSI Initiator port
1385                  * when said port is *NOT* holding the legacy SPC-2 or
1386                  * SPC-3 Persistent Reservation.
1387                  */
1388         }
1389
1390         ret = cmd->se_dev->transport->parse_cdb(cmd);
1391         if (ret < 0)
1392                 return ret;
1393
1394         spin_lock_irqsave(&cmd->t_state_lock, flags);
1395         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1396         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1397
1398         /*
1399          * Check for SAM Task Attribute Emulation
1400          */
1401         if (transport_check_alloc_task_attr(cmd) < 0) {
1402                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1403                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1404                 return -EINVAL;
1405         }
1406         spin_lock(&cmd->se_lun->lun_sep_lock);
1407         if (cmd->se_lun->lun_sep)
1408                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1409         spin_unlock(&cmd->se_lun->lun_sep_lock);
1410         return 0;
1411 }
1412 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1413
1414 /*
1415  * Used by fabric module frontends to queue tasks directly.
1416  * Many only be used from process context only
1417  */
1418 int transport_handle_cdb_direct(
1419         struct se_cmd *cmd)
1420 {
1421         int ret;
1422
1423         if (!cmd->se_lun) {
1424                 dump_stack();
1425                 pr_err("cmd->se_lun is NULL\n");
1426                 return -EINVAL;
1427         }
1428         if (in_interrupt()) {
1429                 dump_stack();
1430                 pr_err("transport_generic_handle_cdb cannot be called"
1431                                 " from interrupt context\n");
1432                 return -EINVAL;
1433         }
1434         /*
1435          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1436          * outstanding descriptors are handled correctly during shutdown via
1437          * transport_wait_for_tasks()
1438          *
1439          * Also, we don't take cmd->t_state_lock here as we only expect
1440          * this to be called for initial descriptor submission.
1441          */
1442         cmd->t_state = TRANSPORT_NEW_CMD;
1443         cmd->transport_state |= CMD_T_ACTIVE;
1444
1445         /*
1446          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1447          * so follow TRANSPORT_NEW_CMD processing thread context usage
1448          * and call transport_generic_request_failure() if necessary..
1449          */
1450         ret = transport_generic_new_cmd(cmd);
1451         if (ret < 0)
1452                 transport_generic_request_failure(cmd);
1453
1454         return 0;
1455 }
1456 EXPORT_SYMBOL(transport_handle_cdb_direct);
1457
1458 /*
1459  * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1460  *                       se_cmd + use pre-allocated SGL memory.
1461  *
1462  * @se_cmd: command descriptor to submit
1463  * @se_sess: associated se_sess for endpoint
1464  * @cdb: pointer to SCSI CDB
1465  * @sense: pointer to SCSI sense buffer
1466  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1467  * @data_length: fabric expected data transfer length
1468  * @task_addr: SAM task attribute
1469  * @data_dir: DMA data direction
1470  * @flags: flags for command submission from target_sc_flags_tables
1471  * @sgl: struct scatterlist memory for unidirectional mapping
1472  * @sgl_count: scatterlist count for unidirectional mapping
1473  * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1474  * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1475  *
1476  * Returns non zero to signal active I/O shutdown failure.  All other
1477  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478  * but still return zero here.
1479  *
1480  * This may only be called from process context, and also currently
1481  * assumes internal allocation of fabric payload buffer by target-core.
1482  */
1483 int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1484                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1485                 u32 data_length, int task_attr, int data_dir, int flags,
1486                 struct scatterlist *sgl, u32 sgl_count,
1487                 struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1488 {
1489         struct se_portal_group *se_tpg;
1490         int rc;
1491
1492         se_tpg = se_sess->se_tpg;
1493         BUG_ON(!se_tpg);
1494         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1495         BUG_ON(in_interrupt());
1496         /*
1497          * Initialize se_cmd for target operation.  From this point
1498          * exceptions are handled by sending exception status via
1499          * target_core_fabric_ops->queue_status() callback
1500          */
1501         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1502                                 data_length, data_dir, task_attr, sense);
1503         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1504                 se_cmd->unknown_data_length = 1;
1505         /*
1506          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1507          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1508          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1509          * kref_put() to happen during fabric packet acknowledgement.
1510          */
1511         rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1512         if (rc)
1513                 return rc;
1514         /*
1515          * Signal bidirectional data payloads to target-core
1516          */
1517         if (flags & TARGET_SCF_BIDI_OP)
1518                 se_cmd->se_cmd_flags |= SCF_BIDI;
1519         /*
1520          * Locate se_lun pointer and attach it to struct se_cmd
1521          */
1522         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1523                 transport_send_check_condition_and_sense(se_cmd,
1524                                 se_cmd->scsi_sense_reason, 0);
1525                 target_put_sess_cmd(se_sess, se_cmd);
1526                 return 0;
1527         }
1528
1529         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1530         if (rc != 0) {
1531                 transport_generic_request_failure(se_cmd);
1532                 return 0;
1533         }
1534         /*
1535          * When a non zero sgl_count has been passed perform SGL passthrough
1536          * mapping for pre-allocated fabric memory instead of having target
1537          * core perform an internal SGL allocation..
1538          */
1539         if (sgl_count != 0) {
1540                 BUG_ON(!sgl);
1541
1542                 /*
1543                  * A work-around for tcm_loop as some userspace code via
1544                  * scsi-generic do not memset their associated read buffers,
1545                  * so go ahead and do that here for type non-data CDBs.  Also
1546                  * note that this is currently guaranteed to be a single SGL
1547                  * for this case by target core in target_setup_cmd_from_cdb()
1548                  * -> transport_generic_cmd_sequencer().
1549                  */
1550                 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1551                      se_cmd->data_direction == DMA_FROM_DEVICE) {
1552                         unsigned char *buf = NULL;
1553
1554                         if (sgl)
1555                                 buf = kmap(sg_page(sgl)) + sgl->offset;
1556
1557                         if (buf) {
1558                                 memset(buf, 0, sgl->length);
1559                                 kunmap(sg_page(sgl));
1560                         }
1561                 }
1562
1563                 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1564                                 sgl_bidi, sgl_bidi_count);
1565                 if (rc != 0) {
1566                         transport_generic_request_failure(se_cmd);
1567                         return 0;
1568                 }
1569         }
1570         /*
1571          * Check if we need to delay processing because of ALUA
1572          * Active/NonOptimized primary access state..
1573          */
1574         core_alua_check_nonop_delay(se_cmd);
1575
1576         transport_handle_cdb_direct(se_cmd);
1577         return 0;
1578 }
1579 EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1580
1581 /*
1582  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1583  *
1584  * @se_cmd: command descriptor to submit
1585  * @se_sess: associated se_sess for endpoint
1586  * @cdb: pointer to SCSI CDB
1587  * @sense: pointer to SCSI sense buffer
1588  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1589  * @data_length: fabric expected data transfer length
1590  * @task_addr: SAM task attribute
1591  * @data_dir: DMA data direction
1592  * @flags: flags for command submission from target_sc_flags_tables
1593  *
1594  * Returns non zero to signal active I/O shutdown failure.  All other
1595  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1596  * but still return zero here.
1597  *
1598  * This may only be called from process context, and also currently
1599  * assumes internal allocation of fabric payload buffer by target-core.
1600  *
1601  * It also assumes interal target core SGL memory allocation.
1602  */
1603 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1604                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1605                 u32 data_length, int task_attr, int data_dir, int flags)
1606 {
1607         return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1608                         unpacked_lun, data_length, task_attr, data_dir,
1609                         flags, NULL, 0, NULL, 0);
1610 }
1611 EXPORT_SYMBOL(target_submit_cmd);
1612
1613 static void target_complete_tmr_failure(struct work_struct *work)
1614 {
1615         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1616
1617         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1618         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1619         transport_generic_free_cmd(se_cmd, 0);
1620 }
1621
1622 /**
1623  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1624  *                     for TMR CDBs
1625  *
1626  * @se_cmd: command descriptor to submit
1627  * @se_sess: associated se_sess for endpoint
1628  * @sense: pointer to SCSI sense buffer
1629  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1630  * @fabric_context: fabric context for TMR req
1631  * @tm_type: Type of TM request
1632  * @gfp: gfp type for caller
1633  * @tag: referenced task tag for TMR_ABORT_TASK
1634  * @flags: submit cmd flags
1635  *
1636  * Callable from all contexts.
1637  **/
1638
1639 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1640                 unsigned char *sense, u32 unpacked_lun,
1641                 void *fabric_tmr_ptr, unsigned char tm_type,
1642                 gfp_t gfp, unsigned int tag, int flags)
1643 {
1644         struct se_portal_group *se_tpg;
1645         int ret;
1646
1647         se_tpg = se_sess->se_tpg;
1648         BUG_ON(!se_tpg);
1649
1650         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1651                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1652         /*
1653          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1654          * allocation failure.
1655          */
1656         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1657         if (ret < 0)
1658                 return -ENOMEM;
1659
1660         if (tm_type == TMR_ABORT_TASK)
1661                 se_cmd->se_tmr_req->ref_task_tag = tag;
1662
1663         /* See target_submit_cmd for commentary */
1664         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1665         if (ret) {
1666                 core_tmr_release_req(se_cmd->se_tmr_req);
1667                 return ret;
1668         }
1669
1670         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1671         if (ret) {
1672                 /*
1673                  * For callback during failure handling, push this work off
1674                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1675                  */
1676                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1677                 schedule_work(&se_cmd->work);
1678                 return 0;
1679         }
1680         transport_generic_handle_tmr(se_cmd);
1681         return 0;
1682 }
1683 EXPORT_SYMBOL(target_submit_tmr);
1684
1685 /*
1686  * If the cmd is active, request it to be stopped and sleep until it
1687  * has completed.
1688  */
1689 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1690 {
1691         bool was_active = false;
1692
1693         if (cmd->transport_state & CMD_T_BUSY) {
1694                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1695                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1696
1697                 pr_debug("cmd %p waiting to complete\n", cmd);
1698                 wait_for_completion(&cmd->task_stop_comp);
1699                 pr_debug("cmd %p stopped successfully\n", cmd);
1700
1701                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1702                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1703                 cmd->transport_state &= ~CMD_T_BUSY;
1704                 was_active = true;
1705         }
1706
1707         return was_active;
1708 }
1709
1710 /*
1711  * Handle SAM-esque emulation for generic transport request failures.
1712  */
1713 void transport_generic_request_failure(struct se_cmd *cmd)
1714 {
1715         int ret = 0;
1716
1717         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1718                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1719                 cmd->t_task_cdb[0]);
1720         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1721                 cmd->se_tfo->get_cmd_state(cmd),
1722                 cmd->t_state, cmd->scsi_sense_reason);
1723         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1724                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1725                 (cmd->transport_state & CMD_T_STOP) != 0,
1726                 (cmd->transport_state & CMD_T_SENT) != 0);
1727
1728         /*
1729          * For SAM Task Attribute emulation for failed struct se_cmd
1730          */
1731         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1732                 transport_complete_task_attr(cmd);
1733
1734         switch (cmd->scsi_sense_reason) {
1735         case TCM_NON_EXISTENT_LUN:
1736         case TCM_UNSUPPORTED_SCSI_OPCODE:
1737         case TCM_INVALID_CDB_FIELD:
1738         case TCM_INVALID_PARAMETER_LIST:
1739         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1740         case TCM_UNKNOWN_MODE_PAGE:
1741         case TCM_WRITE_PROTECTED:
1742         case TCM_ADDRESS_OUT_OF_RANGE:
1743         case TCM_CHECK_CONDITION_ABORT_CMD:
1744         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1745         case TCM_CHECK_CONDITION_NOT_READY:
1746                 break;
1747         case TCM_RESERVATION_CONFLICT:
1748                 /*
1749                  * No SENSE Data payload for this case, set SCSI Status
1750                  * and queue the response to $FABRIC_MOD.
1751                  *
1752                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1753                  */
1754                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1755                 /*
1756                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1757                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1758                  * CONFLICT STATUS.
1759                  *
1760                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1761                  */
1762                 if (cmd->se_sess &&
1763                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1764                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1765                                 cmd->orig_fe_lun, 0x2C,
1766                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1767
1768                 ret = cmd->se_tfo->queue_status(cmd);
1769                 if (ret == -EAGAIN || ret == -ENOMEM)
1770                         goto queue_full;
1771                 goto check_stop;
1772         default:
1773                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1774                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1775                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1776                 break;
1777         }
1778
1779         ret = transport_send_check_condition_and_sense(cmd,
1780                         cmd->scsi_sense_reason, 0);
1781         if (ret == -EAGAIN || ret == -ENOMEM)
1782                 goto queue_full;
1783
1784 check_stop:
1785         transport_lun_remove_cmd(cmd);
1786         if (!transport_cmd_check_stop_to_fabric(cmd))
1787                 ;
1788         return;
1789
1790 queue_full:
1791         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1792         transport_handle_queue_full(cmd, cmd->se_dev);
1793 }
1794 EXPORT_SYMBOL(transport_generic_request_failure);
1795
1796 static void __target_execute_cmd(struct se_cmd *cmd)
1797 {
1798         int error = 0;
1799
1800         spin_lock_irq(&cmd->t_state_lock);
1801         cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1802         spin_unlock_irq(&cmd->t_state_lock);
1803
1804         if (cmd->execute_cmd)
1805                 error = cmd->execute_cmd(cmd);
1806
1807         if (error) {
1808                 spin_lock_irq(&cmd->t_state_lock);
1809                 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1810                 spin_unlock_irq(&cmd->t_state_lock);
1811
1812                 transport_generic_request_failure(cmd);
1813         }
1814 }
1815
1816 void target_execute_cmd(struct se_cmd *cmd)
1817 {
1818         struct se_device *dev = cmd->se_dev;
1819
1820         /*
1821          * If the received CDB has aleady been aborted stop processing it here.
1822          */
1823         if (transport_check_aborted_status(cmd, 1))
1824                 return;
1825
1826         /*
1827          * Determine if IOCTL context caller in requesting the stopping of this
1828          * command for LUN shutdown purposes.
1829          */
1830         spin_lock_irq(&cmd->t_state_lock);
1831         if (cmd->transport_state & CMD_T_LUN_STOP) {
1832                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1833                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1834
1835                 cmd->transport_state &= ~CMD_T_ACTIVE;
1836                 spin_unlock_irq(&cmd->t_state_lock);
1837                 complete(&cmd->transport_lun_stop_comp);
1838                 return;
1839         }
1840         /*
1841          * Determine if frontend context caller is requesting the stopping of
1842          * this command for frontend exceptions.
1843          */
1844         if (cmd->transport_state & CMD_T_STOP) {
1845                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1846                         __func__, __LINE__,
1847                         cmd->se_tfo->get_task_tag(cmd));
1848
1849                 spin_unlock_irq(&cmd->t_state_lock);
1850                 complete(&cmd->t_transport_stop_comp);
1851                 return;
1852         }
1853
1854         cmd->t_state = TRANSPORT_PROCESSING;
1855         spin_unlock_irq(&cmd->t_state_lock);
1856
1857         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1858                 goto execute;
1859
1860         /*
1861          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1862          * to allow the passed struct se_cmd list of tasks to the front of the list.
1863          */
1864         switch (cmd->sam_task_attr) {
1865         case MSG_HEAD_TAG:
1866                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1867                          "se_ordered_id: %u\n",
1868                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1869                 goto execute;
1870         case MSG_ORDERED_TAG:
1871                 atomic_inc(&dev->dev_ordered_sync);
1872                 smp_mb__after_atomic_inc();
1873
1874                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1875                          " se_ordered_id: %u\n",
1876                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1877
1878                 /*
1879                  * Execute an ORDERED command if no other older commands
1880                  * exist that need to be completed first.
1881                  */
1882                 if (!atomic_read(&dev->simple_cmds))
1883                         goto execute;
1884                 break;
1885         default:
1886                 /*
1887                  * For SIMPLE and UNTAGGED Task Attribute commands
1888                  */
1889                 atomic_inc(&dev->simple_cmds);
1890                 smp_mb__after_atomic_inc();
1891                 break;
1892         }
1893
1894         if (atomic_read(&dev->dev_ordered_sync) != 0) {
1895                 spin_lock(&dev->delayed_cmd_lock);
1896                 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1897                 spin_unlock(&dev->delayed_cmd_lock);
1898
1899                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1900                         " delayed CMD list, se_ordered_id: %u\n",
1901                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1902                         cmd->se_ordered_id);
1903                 return;
1904         }
1905
1906 execute:
1907         /*
1908          * Otherwise, no ORDERED task attributes exist..
1909          */
1910         __target_execute_cmd(cmd);
1911 }
1912 EXPORT_SYMBOL(target_execute_cmd);
1913
1914 /*
1915  * Process all commands up to the last received ORDERED task attribute which
1916  * requires another blocking boundary
1917  */
1918 static void target_restart_delayed_cmds(struct se_device *dev)
1919 {
1920         for (;;) {
1921                 struct se_cmd *cmd;
1922
1923                 spin_lock(&dev->delayed_cmd_lock);
1924                 if (list_empty(&dev->delayed_cmd_list)) {
1925                         spin_unlock(&dev->delayed_cmd_lock);
1926                         break;
1927                 }
1928
1929                 cmd = list_entry(dev->delayed_cmd_list.next,
1930                                  struct se_cmd, se_delayed_node);
1931                 list_del(&cmd->se_delayed_node);
1932                 spin_unlock(&dev->delayed_cmd_lock);
1933
1934                 __target_execute_cmd(cmd);
1935
1936                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1937                         break;
1938         }
1939 }
1940
1941 /*
1942  * Called from I/O completion to determine which dormant/delayed
1943  * and ordered cmds need to have their tasks added to the execution queue.
1944  */
1945 static void transport_complete_task_attr(struct se_cmd *cmd)
1946 {
1947         struct se_device *dev = cmd->se_dev;
1948
1949         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1950                 atomic_dec(&dev->simple_cmds);
1951                 smp_mb__after_atomic_dec();
1952                 dev->dev_cur_ordered_id++;
1953                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1954                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1955                         cmd->se_ordered_id);
1956         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1957                 dev->dev_cur_ordered_id++;
1958                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1959                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1960                         cmd->se_ordered_id);
1961         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1962                 atomic_dec(&dev->dev_ordered_sync);
1963                 smp_mb__after_atomic_dec();
1964
1965                 dev->dev_cur_ordered_id++;
1966                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1967                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1968         }
1969
1970         target_restart_delayed_cmds(dev);
1971 }
1972
1973 static void transport_complete_qf(struct se_cmd *cmd)
1974 {
1975         int ret = 0;
1976
1977         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1978                 transport_complete_task_attr(cmd);
1979
1980         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1981                 ret = cmd->se_tfo->queue_status(cmd);
1982                 if (ret)
1983                         goto out;
1984         }
1985
1986         switch (cmd->data_direction) {
1987         case DMA_FROM_DEVICE:
1988                 ret = cmd->se_tfo->queue_data_in(cmd);
1989                 break;
1990         case DMA_TO_DEVICE:
1991                 if (cmd->t_bidi_data_sg) {
1992                         ret = cmd->se_tfo->queue_data_in(cmd);
1993                         if (ret < 0)
1994                                 break;
1995                 }
1996                 /* Fall through for DMA_TO_DEVICE */
1997         case DMA_NONE:
1998                 ret = cmd->se_tfo->queue_status(cmd);
1999                 break;
2000         default:
2001                 break;
2002         }
2003
2004 out:
2005         if (ret < 0) {
2006                 transport_handle_queue_full(cmd, cmd->se_dev);
2007                 return;
2008         }
2009         transport_lun_remove_cmd(cmd);
2010         transport_cmd_check_stop_to_fabric(cmd);
2011 }
2012
2013 static void transport_handle_queue_full(
2014         struct se_cmd *cmd,
2015         struct se_device *dev)
2016 {
2017         spin_lock_irq(&dev->qf_cmd_lock);
2018         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2019         atomic_inc(&dev->dev_qf_count);
2020         smp_mb__after_atomic_inc();
2021         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2022
2023         schedule_work(&cmd->se_dev->qf_work_queue);
2024 }
2025
2026 static void target_complete_ok_work(struct work_struct *work)
2027 {
2028         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2029         int ret;
2030
2031         /*
2032          * Check if we need to move delayed/dormant tasks from cmds on the
2033          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2034          * Attribute.
2035          */
2036         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2037                 transport_complete_task_attr(cmd);
2038         /*
2039          * Check to schedule QUEUE_FULL work, or execute an existing
2040          * cmd->transport_qf_callback()
2041          */
2042         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2043                 schedule_work(&cmd->se_dev->qf_work_queue);
2044
2045         /*
2046          * Check if we need to send a sense buffer from
2047          * the struct se_cmd in question.
2048          */
2049         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2050                 WARN_ON(!cmd->scsi_status);
2051                 ret = transport_send_check_condition_and_sense(
2052                                         cmd, 0, 1);
2053                 if (ret == -EAGAIN || ret == -ENOMEM)
2054                         goto queue_full;
2055
2056                 transport_lun_remove_cmd(cmd);
2057                 transport_cmd_check_stop_to_fabric(cmd);
2058                 return;
2059         }
2060         /*
2061          * Check for a callback, used by amongst other things
2062          * XDWRITE_READ_10 emulation.
2063          */
2064         if (cmd->transport_complete_callback)
2065                 cmd->transport_complete_callback(cmd);
2066
2067         switch (cmd->data_direction) {
2068         case DMA_FROM_DEVICE:
2069                 spin_lock(&cmd->se_lun->lun_sep_lock);
2070                 if (cmd->se_lun->lun_sep) {
2071                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2072                                         cmd->data_length;
2073                 }
2074                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2075
2076                 ret = cmd->se_tfo->queue_data_in(cmd);
2077                 if (ret == -EAGAIN || ret == -ENOMEM)
2078                         goto queue_full;
2079                 break;
2080         case DMA_TO_DEVICE:
2081                 spin_lock(&cmd->se_lun->lun_sep_lock);
2082                 if (cmd->se_lun->lun_sep) {
2083                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2084                                 cmd->data_length;
2085                 }
2086                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2087                 /*
2088                  * Check if we need to send READ payload for BIDI-COMMAND
2089                  */
2090                 if (cmd->t_bidi_data_sg) {
2091                         spin_lock(&cmd->se_lun->lun_sep_lock);
2092                         if (cmd->se_lun->lun_sep) {
2093                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2094                                         cmd->data_length;
2095                         }
2096                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2097                         ret = cmd->se_tfo->queue_data_in(cmd);
2098                         if (ret == -EAGAIN || ret == -ENOMEM)
2099                                 goto queue_full;
2100                         break;
2101                 }
2102                 /* Fall through for DMA_TO_DEVICE */
2103         case DMA_NONE:
2104                 ret = cmd->se_tfo->queue_status(cmd);
2105                 if (ret == -EAGAIN || ret == -ENOMEM)
2106                         goto queue_full;
2107                 break;
2108         default:
2109                 break;
2110         }
2111
2112         transport_lun_remove_cmd(cmd);
2113         transport_cmd_check_stop_to_fabric(cmd);
2114         return;
2115
2116 queue_full:
2117         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2118                 " data_direction: %d\n", cmd, cmd->data_direction);
2119         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2120         transport_handle_queue_full(cmd, cmd->se_dev);
2121 }
2122
2123 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2124 {
2125         struct scatterlist *sg;
2126         int count;
2127
2128         for_each_sg(sgl, sg, nents, count)
2129                 __free_page(sg_page(sg));
2130
2131         kfree(sgl);
2132 }
2133
2134 static inline void transport_free_pages(struct se_cmd *cmd)
2135 {
2136         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2137                 return;
2138
2139         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2140         cmd->t_data_sg = NULL;
2141         cmd->t_data_nents = 0;
2142
2143         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2144         cmd->t_bidi_data_sg = NULL;
2145         cmd->t_bidi_data_nents = 0;
2146 }
2147
2148 /**
2149  * transport_release_cmd - free a command
2150  * @cmd:       command to free
2151  *
2152  * This routine unconditionally frees a command, and reference counting
2153  * or list removal must be done in the caller.
2154  */
2155 static void transport_release_cmd(struct se_cmd *cmd)
2156 {
2157         BUG_ON(!cmd->se_tfo);
2158
2159         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2160                 core_tmr_release_req(cmd->se_tmr_req);
2161         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2162                 kfree(cmd->t_task_cdb);
2163         /*
2164          * If this cmd has been setup with target_get_sess_cmd(), drop
2165          * the kref and call ->release_cmd() in kref callback.
2166          */
2167          if (cmd->check_release != 0) {
2168                 target_put_sess_cmd(cmd->se_sess, cmd);
2169                 return;
2170         }
2171         cmd->se_tfo->release_cmd(cmd);
2172 }
2173
2174 /**
2175  * transport_put_cmd - release a reference to a command
2176  * @cmd:       command to release
2177  *
2178  * This routine releases our reference to the command and frees it if possible.
2179  */
2180 static void transport_put_cmd(struct se_cmd *cmd)
2181 {
2182         unsigned long flags;
2183
2184         spin_lock_irqsave(&cmd->t_state_lock, flags);
2185         if (atomic_read(&cmd->t_fe_count)) {
2186                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2187                         goto out_busy;
2188         }
2189
2190         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2191                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2192                 target_remove_from_state_list(cmd);
2193         }
2194         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2195
2196         transport_free_pages(cmd);
2197         transport_release_cmd(cmd);
2198         return;
2199 out_busy:
2200         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2201 }
2202
2203 /*
2204  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2205  * allocating in the core.
2206  * @cmd:  Associated se_cmd descriptor
2207  * @mem:  SGL style memory for TCM WRITE / READ
2208  * @sg_mem_num: Number of SGL elements
2209  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2210  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2211  *
2212  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2213  * of parameters.
2214  */
2215 int transport_generic_map_mem_to_cmd(
2216         struct se_cmd *cmd,
2217         struct scatterlist *sgl,
2218         u32 sgl_count,
2219         struct scatterlist *sgl_bidi,
2220         u32 sgl_bidi_count)
2221 {
2222         if (!sgl || !sgl_count)
2223                 return 0;
2224
2225         /*
2226          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2227          * scatterlists already have been set to follow what the fabric
2228          * passes for the original expected data transfer length.
2229          */
2230         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2231                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2232                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2233                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2234                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2235                 return -EINVAL;
2236         }
2237
2238         cmd->t_data_sg = sgl;
2239         cmd->t_data_nents = sgl_count;
2240
2241         if (sgl_bidi && sgl_bidi_count) {
2242                 cmd->t_bidi_data_sg = sgl_bidi;
2243                 cmd->t_bidi_data_nents = sgl_bidi_count;
2244         }
2245         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2246         return 0;
2247 }
2248 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2249
2250 void *transport_kmap_data_sg(struct se_cmd *cmd)
2251 {
2252         struct scatterlist *sg = cmd->t_data_sg;
2253         struct page **pages;
2254         int i;
2255
2256         /*
2257          * We need to take into account a possible offset here for fabrics like
2258          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2259          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2260          */
2261         if (!cmd->t_data_nents)
2262                 return NULL;
2263
2264         BUG_ON(!sg);
2265         if (cmd->t_data_nents == 1)
2266                 return kmap(sg_page(sg)) + sg->offset;
2267
2268         /* >1 page. use vmap */
2269         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2270         if (!pages) {
2271                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2272                 return NULL;
2273         }
2274
2275         /* convert sg[] to pages[] */
2276         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2277                 pages[i] = sg_page(sg);
2278         }
2279
2280         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2281         kfree(pages);
2282         if (!cmd->t_data_vmap) {
2283                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2284                 return NULL;
2285         }
2286
2287         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2288 }
2289 EXPORT_SYMBOL(transport_kmap_data_sg);
2290
2291 void transport_kunmap_data_sg(struct se_cmd *cmd)
2292 {
2293         if (!cmd->t_data_nents) {
2294                 return;
2295         } else if (cmd->t_data_nents == 1) {
2296                 kunmap(sg_page(cmd->t_data_sg));
2297                 return;
2298         }
2299
2300         vunmap(cmd->t_data_vmap);
2301         cmd->t_data_vmap = NULL;
2302 }
2303 EXPORT_SYMBOL(transport_kunmap_data_sg);
2304
2305 static int
2306 transport_generic_get_mem(struct se_cmd *cmd)
2307 {
2308         u32 length = cmd->data_length;
2309         unsigned int nents;
2310         struct page *page;
2311         gfp_t zero_flag;
2312         int i = 0;
2313
2314         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2315         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2316         if (!cmd->t_data_sg)
2317                 return -ENOMEM;
2318
2319         cmd->t_data_nents = nents;
2320         sg_init_table(cmd->t_data_sg, nents);
2321
2322         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2323
2324         while (length) {
2325                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2326                 page = alloc_page(GFP_KERNEL | zero_flag);
2327                 if (!page)
2328                         goto out;
2329
2330                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2331                 length -= page_len;
2332                 i++;
2333         }
2334         return 0;
2335
2336 out:
2337         while (i > 0) {
2338                 i--;
2339                 __free_page(sg_page(&cmd->t_data_sg[i]));
2340         }
2341         kfree(cmd->t_data_sg);
2342         cmd->t_data_sg = NULL;
2343         return -ENOMEM;
2344 }
2345
2346 /*
2347  * Allocate any required resources to execute the command.  For writes we
2348  * might not have the payload yet, so notify the fabric via a call to
2349  * ->write_pending instead. Otherwise place it on the execution queue.
2350  */
2351 int transport_generic_new_cmd(struct se_cmd *cmd)
2352 {
2353         int ret = 0;
2354
2355         /*
2356          * Determine is the TCM fabric module has already allocated physical
2357          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2358          * beforehand.
2359          */
2360         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2361             cmd->data_length) {
2362                 ret = transport_generic_get_mem(cmd);
2363                 if (ret < 0)
2364                         goto out_fail;
2365         }
2366
2367         atomic_inc(&cmd->t_fe_count);
2368
2369         /*
2370          * If this command is not a write we can execute it right here,
2371          * for write buffers we need to notify the fabric driver first
2372          * and let it call back once the write buffers are ready.
2373          */
2374         target_add_to_state_list(cmd);
2375         if (cmd->data_direction != DMA_TO_DEVICE) {
2376                 target_execute_cmd(cmd);
2377                 return 0;
2378         }
2379
2380         spin_lock_irq(&cmd->t_state_lock);
2381         cmd->t_state = TRANSPORT_WRITE_PENDING;
2382         spin_unlock_irq(&cmd->t_state_lock);
2383
2384         transport_cmd_check_stop(cmd, false);
2385
2386         ret = cmd->se_tfo->write_pending(cmd);
2387         if (ret == -EAGAIN || ret == -ENOMEM)
2388                 goto queue_full;
2389
2390         if (ret < 0)
2391                 return ret;
2392         return 1;
2393
2394 out_fail:
2395         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2396         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2397         return -EINVAL;
2398 queue_full:
2399         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2400         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2401         transport_handle_queue_full(cmd, cmd->se_dev);
2402         return 0;
2403 }
2404 EXPORT_SYMBOL(transport_generic_new_cmd);
2405
2406 static void transport_write_pending_qf(struct se_cmd *cmd)
2407 {
2408         int ret;
2409
2410         ret = cmd->se_tfo->write_pending(cmd);
2411         if (ret == -EAGAIN || ret == -ENOMEM) {
2412                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2413                          cmd);
2414                 transport_handle_queue_full(cmd, cmd->se_dev);
2415         }
2416 }
2417
2418 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2419 {
2420         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2421                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2422                          transport_wait_for_tasks(cmd);
2423
2424                 transport_release_cmd(cmd);
2425         } else {
2426                 if (wait_for_tasks)
2427                         transport_wait_for_tasks(cmd);
2428
2429                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2430
2431                 if (cmd->se_lun)
2432                         transport_lun_remove_cmd(cmd);
2433
2434                 transport_put_cmd(cmd);
2435         }
2436 }
2437 EXPORT_SYMBOL(transport_generic_free_cmd);
2438
2439 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2440  * @se_sess:    session to reference
2441  * @se_cmd:     command descriptor to add
2442  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2443  */
2444 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2445                                bool ack_kref)
2446 {
2447         unsigned long flags;
2448         int ret = 0;
2449
2450         kref_init(&se_cmd->cmd_kref);
2451         /*
2452          * Add a second kref if the fabric caller is expecting to handle
2453          * fabric acknowledgement that requires two target_put_sess_cmd()
2454          * invocations before se_cmd descriptor release.
2455          */
2456         if (ack_kref == true) {
2457                 kref_get(&se_cmd->cmd_kref);
2458                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2459         }
2460
2461         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2462         if (se_sess->sess_tearing_down) {
2463                 ret = -ESHUTDOWN;
2464                 goto out;
2465         }
2466         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2467         se_cmd->check_release = 1;
2468
2469 out:
2470         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2471         return ret;
2472 }
2473
2474 static void target_release_cmd_kref(struct kref *kref)
2475 {
2476         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2477         struct se_session *se_sess = se_cmd->se_sess;
2478         unsigned long flags;
2479
2480         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2481         if (list_empty(&se_cmd->se_cmd_list)) {
2482                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2483                 se_cmd->se_tfo->release_cmd(se_cmd);
2484                 return;
2485         }
2486         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2487                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2488                 complete(&se_cmd->cmd_wait_comp);
2489                 return;
2490         }
2491         list_del(&se_cmd->se_cmd_list);
2492         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2493
2494         se_cmd->se_tfo->release_cmd(se_cmd);
2495 }
2496
2497 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2498  * @se_sess:    session to reference
2499  * @se_cmd:     command descriptor to drop
2500  */
2501 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2502 {
2503         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2504 }
2505 EXPORT_SYMBOL(target_put_sess_cmd);
2506
2507 /* target_sess_cmd_list_set_waiting - Flag all commands in
2508  *         sess_cmd_list to complete cmd_wait_comp.  Set
2509  *         sess_tearing_down so no more commands are queued.
2510  * @se_sess:    session to flag
2511  */
2512 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2513 {
2514         struct se_cmd *se_cmd;
2515         unsigned long flags;
2516
2517         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2518
2519         WARN_ON(se_sess->sess_tearing_down);
2520         se_sess->sess_tearing_down = 1;
2521
2522         list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2523                 se_cmd->cmd_wait_set = 1;
2524
2525         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2526 }
2527 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2528
2529 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2530  * @se_sess:    session to wait for active I/O
2531  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2532  */
2533 void target_wait_for_sess_cmds(
2534         struct se_session *se_sess,
2535         int wait_for_tasks)
2536 {
2537         struct se_cmd *se_cmd, *tmp_cmd;
2538         bool rc = false;
2539
2540         list_for_each_entry_safe(se_cmd, tmp_cmd,
2541                                 &se_sess->sess_cmd_list, se_cmd_list) {
2542                 list_del(&se_cmd->se_cmd_list);
2543
2544                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2545                         " %d\n", se_cmd, se_cmd->t_state,
2546                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2547
2548                 if (wait_for_tasks) {
2549                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2550                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2551                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2552
2553                         rc = transport_wait_for_tasks(se_cmd);
2554
2555                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2556                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2557                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2558                 }
2559
2560                 if (!rc) {
2561                         wait_for_completion(&se_cmd->cmd_wait_comp);
2562                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2563                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2564                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2565                 }
2566
2567                 se_cmd->se_tfo->release_cmd(se_cmd);
2568         }
2569 }
2570 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2571
2572 /*      transport_lun_wait_for_tasks():
2573  *
2574  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2575  *      an struct se_lun to be successfully shutdown.
2576  */
2577 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2578 {
2579         unsigned long flags;
2580         int ret = 0;
2581
2582         /*
2583          * If the frontend has already requested this struct se_cmd to
2584          * be stopped, we can safely ignore this struct se_cmd.
2585          */
2586         spin_lock_irqsave(&cmd->t_state_lock, flags);
2587         if (cmd->transport_state & CMD_T_STOP) {
2588                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2589
2590                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2591                          cmd->se_tfo->get_task_tag(cmd));
2592                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2593                 transport_cmd_check_stop(cmd, false);
2594                 return -EPERM;
2595         }
2596         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2597         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2598
2599         // XXX: audit task_flags checks.
2600         spin_lock_irqsave(&cmd->t_state_lock, flags);
2601         if ((cmd->transport_state & CMD_T_BUSY) &&
2602             (cmd->transport_state & CMD_T_SENT)) {
2603                 if (!target_stop_cmd(cmd, &flags))
2604                         ret++;
2605         }
2606         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2607
2608         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2609                         " %d\n", cmd, ret);
2610         if (!ret) {
2611                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2612                                 cmd->se_tfo->get_task_tag(cmd));
2613                 wait_for_completion(&cmd->transport_lun_stop_comp);
2614                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2615                                 cmd->se_tfo->get_task_tag(cmd));
2616         }
2617
2618         return 0;
2619 }
2620
2621 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2622 {
2623         struct se_cmd *cmd = NULL;
2624         unsigned long lun_flags, cmd_flags;
2625         /*
2626          * Do exception processing and return CHECK_CONDITION status to the
2627          * Initiator Port.
2628          */
2629         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2630         while (!list_empty(&lun->lun_cmd_list)) {
2631                 cmd = list_first_entry(&lun->lun_cmd_list,
2632                        struct se_cmd, se_lun_node);
2633                 list_del_init(&cmd->se_lun_node);
2634
2635                 spin_lock(&cmd->t_state_lock);
2636                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2637                         "_lun_stop for  ITT: 0x%08x\n",
2638                         cmd->se_lun->unpacked_lun,
2639                         cmd->se_tfo->get_task_tag(cmd));
2640                 cmd->transport_state |= CMD_T_LUN_STOP;
2641                 spin_unlock(&cmd->t_state_lock);
2642
2643                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2644
2645                 if (!cmd->se_lun) {
2646                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2647                                 cmd->se_tfo->get_task_tag(cmd),
2648                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2649                         BUG();
2650                 }
2651                 /*
2652                  * If the Storage engine still owns the iscsi_cmd_t, determine
2653                  * and/or stop its context.
2654                  */
2655                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2656                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2657                         cmd->se_tfo->get_task_tag(cmd));
2658
2659                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2660                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2661                         continue;
2662                 }
2663
2664                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2665                         "_wait_for_tasks(): SUCCESS\n",
2666                         cmd->se_lun->unpacked_lun,
2667                         cmd->se_tfo->get_task_tag(cmd));
2668
2669                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2670                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2671                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2672                         goto check_cond;
2673                 }
2674                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2675                 target_remove_from_state_list(cmd);
2676                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2677
2678                 /*
2679                  * The Storage engine stopped this struct se_cmd before it was
2680                  * send to the fabric frontend for delivery back to the
2681                  * Initiator Node.  Return this SCSI CDB back with an
2682                  * CHECK_CONDITION status.
2683                  */
2684 check_cond:
2685                 transport_send_check_condition_and_sense(cmd,
2686                                 TCM_NON_EXISTENT_LUN, 0);
2687                 /*
2688                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
2689                  * be released, notify the waiting thread now that LU has
2690                  * finished accessing it.
2691                  */
2692                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2693                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2694                         pr_debug("SE_LUN[%d] - Detected FE stop for"
2695                                 " struct se_cmd: %p ITT: 0x%08x\n",
2696                                 lun->unpacked_lun,
2697                                 cmd, cmd->se_tfo->get_task_tag(cmd));
2698
2699                         spin_unlock_irqrestore(&cmd->t_state_lock,
2700                                         cmd_flags);
2701                         transport_cmd_check_stop(cmd, false);
2702                         complete(&cmd->transport_lun_fe_stop_comp);
2703                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2704                         continue;
2705                 }
2706                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2707                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2708
2709                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2710                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2711         }
2712         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2713 }
2714
2715 static int transport_clear_lun_thread(void *p)
2716 {
2717         struct se_lun *lun = p;
2718
2719         __transport_clear_lun_from_sessions(lun);
2720         complete(&lun->lun_shutdown_comp);
2721
2722         return 0;
2723 }
2724
2725 int transport_clear_lun_from_sessions(struct se_lun *lun)
2726 {
2727         struct task_struct *kt;
2728
2729         kt = kthread_run(transport_clear_lun_thread, lun,
2730                         "tcm_cl_%u", lun->unpacked_lun);
2731         if (IS_ERR(kt)) {
2732                 pr_err("Unable to start clear_lun thread\n");
2733                 return PTR_ERR(kt);
2734         }
2735         wait_for_completion(&lun->lun_shutdown_comp);
2736
2737         return 0;
2738 }
2739
2740 /**
2741  * transport_wait_for_tasks - wait for completion to occur
2742  * @cmd:        command to wait
2743  *
2744  * Called from frontend fabric context to wait for storage engine
2745  * to pause and/or release frontend generated struct se_cmd.
2746  */
2747 bool transport_wait_for_tasks(struct se_cmd *cmd)
2748 {
2749         unsigned long flags;
2750
2751         spin_lock_irqsave(&cmd->t_state_lock, flags);
2752         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2753             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2754                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2755                 return false;
2756         }
2757
2758         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2759             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2760                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2761                 return false;
2762         }
2763         /*
2764          * If we are already stopped due to an external event (ie: LUN shutdown)
2765          * sleep until the connection can have the passed struct se_cmd back.
2766          * The cmd->transport_lun_stopped_sem will be upped by
2767          * transport_clear_lun_from_sessions() once the ConfigFS context caller
2768          * has completed its operation on the struct se_cmd.
2769          */
2770         if (cmd->transport_state & CMD_T_LUN_STOP) {
2771                 pr_debug("wait_for_tasks: Stopping"
2772                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2773                         "_stop_comp); for ITT: 0x%08x\n",
2774                         cmd->se_tfo->get_task_tag(cmd));
2775                 /*
2776                  * There is a special case for WRITES where a FE exception +
2777                  * LUN shutdown means ConfigFS context is still sleeping on
2778                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2779                  * We go ahead and up transport_lun_stop_comp just to be sure
2780                  * here.
2781                  */
2782                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2783                 complete(&cmd->transport_lun_stop_comp);
2784                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2785                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2786
2787                 target_remove_from_state_list(cmd);
2788                 /*
2789                  * At this point, the frontend who was the originator of this
2790                  * struct se_cmd, now owns the structure and can be released through
2791                  * normal means below.
2792                  */
2793                 pr_debug("wait_for_tasks: Stopped"
2794                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2795                         "stop_comp); for ITT: 0x%08x\n",
2796                         cmd->se_tfo->get_task_tag(cmd));
2797
2798                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2799         }
2800
2801         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2802                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2803                 return false;
2804         }
2805
2806         cmd->transport_state |= CMD_T_STOP;
2807
2808         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2809                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2810                 cmd, cmd->se_tfo->get_task_tag(cmd),
2811                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2812
2813         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2814
2815         wait_for_completion(&cmd->t_transport_stop_comp);
2816
2817         spin_lock_irqsave(&cmd->t_state_lock, flags);
2818         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2819
2820         pr_debug("wait_for_tasks: Stopped wait_for_completion("
2821                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2822                 cmd->se_tfo->get_task_tag(cmd));
2823
2824         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2825
2826         return true;
2827 }
2828 EXPORT_SYMBOL(transport_wait_for_tasks);
2829
2830 static int transport_get_sense_codes(
2831         struct se_cmd *cmd,
2832         u8 *asc,
2833         u8 *ascq)
2834 {
2835         *asc = cmd->scsi_asc;
2836         *ascq = cmd->scsi_ascq;
2837
2838         return 0;
2839 }
2840
2841 static int transport_set_sense_codes(
2842         struct se_cmd *cmd,
2843         u8 asc,
2844         u8 ascq)
2845 {
2846         cmd->scsi_asc = asc;
2847         cmd->scsi_ascq = ascq;
2848
2849         return 0;
2850 }
2851
2852 int transport_send_check_condition_and_sense(
2853         struct se_cmd *cmd,
2854         u8 reason,
2855         int from_transport)
2856 {
2857         unsigned char *buffer = cmd->sense_buffer;
2858         unsigned long flags;
2859         u8 asc = 0, ascq = 0;
2860
2861         spin_lock_irqsave(&cmd->t_state_lock, flags);
2862         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2863                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2864                 return 0;
2865         }
2866         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2867         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2868
2869         if (!reason && from_transport)
2870                 goto after_reason;
2871
2872         if (!from_transport)
2873                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2874
2875         /*
2876          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2877          * SENSE KEY values from include/scsi/scsi.h
2878          */
2879         switch (reason) {
2880         case TCM_NON_EXISTENT_LUN:
2881                 /* CURRENT ERROR */
2882                 buffer[0] = 0x70;
2883                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2884                 /* ILLEGAL REQUEST */
2885                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2886                 /* LOGICAL UNIT NOT SUPPORTED */
2887                 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2888                 break;
2889         case TCM_UNSUPPORTED_SCSI_OPCODE:
2890         case TCM_SECTOR_COUNT_TOO_MANY:
2891                 /* CURRENT ERROR */
2892                 buffer[0] = 0x70;
2893                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2894                 /* ILLEGAL REQUEST */
2895                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2896                 /* INVALID COMMAND OPERATION CODE */
2897                 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2898                 break;
2899         case TCM_UNKNOWN_MODE_PAGE:
2900                 /* CURRENT ERROR */
2901                 buffer[0] = 0x70;
2902                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2903                 /* ILLEGAL REQUEST */
2904                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2905                 /* INVALID FIELD IN CDB */
2906                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2907                 break;
2908         case TCM_CHECK_CONDITION_ABORT_CMD:
2909                 /* CURRENT ERROR */
2910                 buffer[0] = 0x70;
2911                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2912                 /* ABORTED COMMAND */
2913                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2914                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2915                 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2916                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2917                 break;
2918         case TCM_INCORRECT_AMOUNT_OF_DATA:
2919                 /* CURRENT ERROR */
2920                 buffer[0] = 0x70;
2921                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2922                 /* ABORTED COMMAND */
2923                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2924                 /* WRITE ERROR */
2925                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2926                 /* NOT ENOUGH UNSOLICITED DATA */
2927                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2928                 break;
2929         case TCM_INVALID_CDB_FIELD:
2930                 /* CURRENT ERROR */
2931                 buffer[0] = 0x70;
2932                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2933                 /* ILLEGAL REQUEST */
2934                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2935                 /* INVALID FIELD IN CDB */
2936                 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2937                 break;
2938         case TCM_INVALID_PARAMETER_LIST:
2939                 /* CURRENT ERROR */
2940                 buffer[0] = 0x70;
2941                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2942                 /* ILLEGAL REQUEST */
2943                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2944                 /* INVALID FIELD IN PARAMETER LIST */
2945                 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2946                 break;
2947         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2948                 /* CURRENT ERROR */
2949                 buffer[0] = 0x70;
2950                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2951                 /* ABORTED COMMAND */
2952                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2953                 /* WRITE ERROR */
2954                 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2955                 /* UNEXPECTED_UNSOLICITED_DATA */
2956                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2957                 break;
2958         case TCM_SERVICE_CRC_ERROR:
2959                 /* CURRENT ERROR */
2960                 buffer[0] = 0x70;
2961                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2962                 /* ABORTED COMMAND */
2963                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2964                 /* PROTOCOL SERVICE CRC ERROR */
2965                 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2966                 /* N/A */
2967                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2968                 break;
2969         case TCM_SNACK_REJECTED:
2970                 /* CURRENT ERROR */
2971                 buffer[0] = 0x70;
2972                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2973                 /* ABORTED COMMAND */
2974                 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2975                 /* READ ERROR */
2976                 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2977                 /* FAILED RETRANSMISSION REQUEST */
2978                 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2979                 break;
2980         case TCM_WRITE_PROTECTED:
2981                 /* CURRENT ERROR */
2982                 buffer[0] = 0x70;
2983                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2984                 /* DATA PROTECT */
2985                 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2986                 /* WRITE PROTECTED */
2987                 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2988                 break;
2989         case TCM_ADDRESS_OUT_OF_RANGE:
2990                 /* CURRENT ERROR */
2991                 buffer[0] = 0x70;
2992                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2993                 /* ILLEGAL REQUEST */
2994                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2995                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2996                 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2997                 break;
2998         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2999                 /* CURRENT ERROR */
3000                 buffer[0] = 0x70;
3001                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3002                 /* UNIT ATTENTION */
3003                 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3004                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3005                 buffer[SPC_ASC_KEY_OFFSET] = asc;
3006                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3007                 break;
3008         case TCM_CHECK_CONDITION_NOT_READY:
3009                 /* CURRENT ERROR */
3010                 buffer[0] = 0x70;
3011                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3012                 /* Not Ready */
3013                 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
3014                 transport_get_sense_codes(cmd, &asc, &ascq);
3015                 buffer[SPC_ASC_KEY_OFFSET] = asc;
3016                 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3017                 break;
3018         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3019         default:
3020                 /* CURRENT ERROR */
3021                 buffer[0] = 0x70;
3022                 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3023                 /* ILLEGAL REQUEST */
3024                 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3025                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3026                 buffer[SPC_ASC_KEY_OFFSET] = 0x80;
3027                 break;
3028         }
3029         /*
3030          * This code uses linux/include/scsi/scsi.h SAM status codes!
3031          */
3032         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3033         /*
3034          * Automatically padded, this value is encoded in the fabric's
3035          * data_length response PDU containing the SCSI defined sense data.
3036          */
3037         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER;
3038
3039 after_reason:
3040         return cmd->se_tfo->queue_status(cmd);
3041 }
3042 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3043
3044 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3045 {
3046         int ret = 0;
3047
3048         if (cmd->transport_state & CMD_T_ABORTED) {
3049                 if (!send_status ||
3050                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3051                         return 1;
3052
3053                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3054                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3055                         cmd->t_task_cdb[0],
3056                         cmd->se_tfo->get_task_tag(cmd));
3057
3058                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3059                 cmd->se_tfo->queue_status(cmd);
3060                 ret = 1;
3061         }
3062         return ret;
3063 }
3064 EXPORT_SYMBOL(transport_check_aborted_status);
3065
3066 void transport_send_task_abort(struct se_cmd *cmd)
3067 {
3068         unsigned long flags;
3069
3070         spin_lock_irqsave(&cmd->t_state_lock, flags);
3071         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3072                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3073                 return;
3074         }
3075         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3076
3077         /*
3078          * If there are still expected incoming fabric WRITEs, we wait
3079          * until until they have completed before sending a TASK_ABORTED
3080          * response.  This response with TASK_ABORTED status will be
3081          * queued back to fabric module by transport_check_aborted_status().
3082          */
3083         if (cmd->data_direction == DMA_TO_DEVICE) {
3084                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3085                         cmd->transport_state |= CMD_T_ABORTED;
3086                         smp_mb__after_atomic_inc();
3087                 }
3088         }
3089         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3090
3091         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3092                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3093                 cmd->se_tfo->get_task_tag(cmd));
3094
3095         cmd->se_tfo->queue_status(cmd);
3096 }
3097
3098 static void target_tmr_work(struct work_struct *work)
3099 {
3100         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3101         struct se_device *dev = cmd->se_dev;
3102         struct se_tmr_req *tmr = cmd->se_tmr_req;
3103         int ret;
3104
3105         switch (tmr->function) {
3106         case TMR_ABORT_TASK:
3107                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3108                 break;
3109         case TMR_ABORT_TASK_SET:
3110         case TMR_CLEAR_ACA:
3111         case TMR_CLEAR_TASK_SET:
3112                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3113                 break;
3114         case TMR_LUN_RESET:
3115                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3116                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3117                                          TMR_FUNCTION_REJECTED;
3118                 break;
3119         case TMR_TARGET_WARM_RESET:
3120                 tmr->response = TMR_FUNCTION_REJECTED;
3121                 break;
3122         case TMR_TARGET_COLD_RESET:
3123                 tmr->response = TMR_FUNCTION_REJECTED;
3124                 break;
3125         default:
3126                 pr_err("Uknown TMR function: 0x%02x.\n",
3127                                 tmr->function);
3128                 tmr->response = TMR_FUNCTION_REJECTED;
3129                 break;
3130         }
3131
3132         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3133         cmd->se_tfo->queue_tm_rsp(cmd);
3134
3135         transport_cmd_check_stop_to_fabric(cmd);
3136 }
3137
3138 int transport_generic_handle_tmr(
3139         struct se_cmd *cmd)
3140 {
3141         INIT_WORK(&cmd->work, target_tmr_work);
3142         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3143         return 0;
3144 }
3145 EXPORT_SYMBOL(transport_generic_handle_tmr);