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 int sub_api_initialized;
  59
  60 static struct workqueue_struct *target_completion_wq;
  61 static struct kmem_cache *se_sess_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static void transport_complete_task_attr(struct se_cmd *cmd);
  70 static void transport_handle_queue_full(struct se_cmd *cmd,
  71                 struct se_device *dev);
  72 static int transport_generic_get_mem(struct se_cmd *cmd);
  73 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
  74 static void transport_put_cmd(struct se_cmd *cmd);
  75 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  76 static void target_complete_ok_work(struct work_struct *work);
  77
  78 int init_se_kmem_caches(void)
  79 {
  80         se_sess_cache = kmem_cache_create("se_sess_cache",
  81                         sizeof(struct se_session), __alignof__(struct se_session),
  82                         0, NULL);
  83         if (!se_sess_cache) {
  84                 pr_err("kmem_cache_create() for struct se_session"
  85                                 " failed\n");
  86                 goto out;
  87         }
  88         se_ua_cache = kmem_cache_create("se_ua_cache",
  89                         sizeof(struct se_ua), __alignof__(struct se_ua),
  90                         0, NULL);
  91         if (!se_ua_cache) {
  92                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  93                 goto out_free_sess_cache;
  94         }
  95         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  96                         sizeof(struct t10_pr_registration),
  97                         __alignof__(struct t10_pr_registration), 0, NULL);
  98         if (!t10_pr_reg_cache) {
  99                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 100                                 " failed\n");
 101                 goto out_free_ua_cache;
 102         }
 103         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 104                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 105                         0, NULL);
 106         if (!t10_alua_lu_gp_cache) {
 107                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 108                                 " failed\n");
 109                 goto out_free_pr_reg_cache;
 110         }
 111         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 112                         sizeof(struct t10_alua_lu_gp_member),
 113                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 114         if (!t10_alua_lu_gp_mem_cache) {
 115                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 116                                 "cache failed\n");
 117                 goto out_free_lu_gp_cache;
 118         }
 119         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 120                         sizeof(struct t10_alua_tg_pt_gp),
 121                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 122         if (!t10_alua_tg_pt_gp_cache) {
 123                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 124                                 "cache failed\n");
 125                 goto out_free_lu_gp_mem_cache;
 126         }
 127         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 128                         "t10_alua_tg_pt_gp_mem_cache",
 129                         sizeof(struct t10_alua_tg_pt_gp_member),
 130                         __alignof__(struct t10_alua_tg_pt_gp_member),
 131                         0, NULL);
 132         if (!t10_alua_tg_pt_gp_mem_cache) {
 133                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 134                                 "mem_t failed\n");
 135                 goto out_free_tg_pt_gp_cache;
 136         }
 137
 138         target_completion_wq = alloc_workqueue("target_completion",
 139                                                WQ_MEM_RECLAIM, 0);
 140         if (!target_completion_wq)
 141                 goto out_free_tg_pt_gp_mem_cache;
 142
 143         return 0;
 144
 145 out_free_tg_pt_gp_mem_cache:
 146         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 147 out_free_tg_pt_gp_cache:
 148         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 149 out_free_lu_gp_mem_cache:
 150         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 151 out_free_lu_gp_cache:
 152         kmem_cache_destroy(t10_alua_lu_gp_cache);
 153 out_free_pr_reg_cache:
 154         kmem_cache_destroy(t10_pr_reg_cache);
 155 out_free_ua_cache:
 156         kmem_cache_destroy(se_ua_cache);
 157 out_free_sess_cache:
 158         kmem_cache_destroy(se_sess_cache);
 159 out:
 160         return -ENOMEM;
 161 }
 162
 163 void release_se_kmem_caches(void)
 164 {
 165         destroy_workqueue(target_completion_wq);
 166         kmem_cache_destroy(se_sess_cache);
 167         kmem_cache_destroy(se_ua_cache);
 168         kmem_cache_destroy(t10_pr_reg_cache);
 169         kmem_cache_destroy(t10_alua_lu_gp_cache);
 170         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 171         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 172         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 173 }
 174
 175 /* This code ensures unique mib indexes are handed out. */
 176 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 177 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 178
 179 /*
 180  * Allocate a new row index for the entry type specified
 181  */
 182 u32 scsi_get_new_index(scsi_index_t type)
 183 {
 184         u32 new_index;
 185
 186         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 187
 188         spin_lock(&scsi_mib_index_lock);
 189         new_index = ++scsi_mib_index[type];
 190         spin_unlock(&scsi_mib_index_lock);
 191
 192         return new_index;
 193 }
 194
 195 void transport_subsystem_check_init(void)
 196 {
 197         int ret;
 198
 199         if (sub_api_initialized)
 200                 return;
 201
 202         ret = request_module("target_core_iblock");
 203         if (ret != 0)
 204                 pr_err("Unable to load target_core_iblock\n");
 205
 206         ret = request_module("target_core_file");
 207         if (ret != 0)
 208                 pr_err("Unable to load target_core_file\n");
 209
 210         ret = request_module("target_core_pscsi");
 211         if (ret != 0)
 212                 pr_err("Unable to load target_core_pscsi\n");
 213
 214         ret = request_module("target_core_stgt");
 215         if (ret != 0)
 216                 pr_err("Unable to load target_core_stgt\n");
 217
 218         sub_api_initialized = 1;
 219         return;
 220 }
 221
 222 struct se_session *transport_init_session(void)
 223 {
 224         struct se_session *se_sess;
 225
 226         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 227         if (!se_sess) {
 228                 pr_err("Unable to allocate struct se_session from"
 229                                 " se_sess_cache\n");
 230                 return ERR_PTR(-ENOMEM);
 231         }
 232         INIT_LIST_HEAD(&se_sess->sess_list);
 233         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 234         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 235         spin_lock_init(&se_sess->sess_cmd_lock);
 236         kref_init(&se_sess->sess_kref);
 237
 238         return se_sess;
 239 }
 240 EXPORT_SYMBOL(transport_init_session);
 241
 242 /*
 243  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 244  */
 245 void __transport_register_session(
 246         struct se_portal_group *se_tpg,
 247         struct se_node_acl *se_nacl,
 248         struct se_session *se_sess,
 249         void *fabric_sess_ptr)
 250 {
 251         unsigned char buf[PR_REG_ISID_LEN];
 252
 253         se_sess->se_tpg = se_tpg;
 254         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 255         /*
 256          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 257          *
 258          * Only set for struct se_session's that will actually be moving I/O.
 259          * eg: *NOT* discovery sessions.
 260          */
 261         if (se_nacl) {
 262                 /*
 263                  * If the fabric module supports an ISID based TransportID,
 264                  * save this value in binary from the fabric I_T Nexus now.
 265                  */
 266                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 267                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 268                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 269                                         &buf[0], PR_REG_ISID_LEN);
 270                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 271                 }
 272                 kref_get(&se_nacl->acl_kref);
 273
 274                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 275                 /*
 276                  * The se_nacl->nacl_sess pointer will be set to the
 277                  * last active I_T Nexus for each struct se_node_acl.
 278                  */
 279                 se_nacl->nacl_sess = se_sess;
 280
 281                 list_add_tail(&se_sess->sess_acl_list,
 282                               &se_nacl->acl_sess_list);
 283                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 284         }
 285         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 286
 287         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 288                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 289 }
 290 EXPORT_SYMBOL(__transport_register_session);
 291
 292 void transport_register_session(
 293         struct se_portal_group *se_tpg,
 294         struct se_node_acl *se_nacl,
 295         struct se_session *se_sess,
 296         void *fabric_sess_ptr)
 297 {
 298         unsigned long flags;
 299
 300         spin_lock_irqsave(&se_tpg->session_lock, flags);
 301         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 302         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 303 }
 304 EXPORT_SYMBOL(transport_register_session);
 305
 306 void target_release_session(struct kref *kref)
 307 {
 308         struct se_session *se_sess = container_of(kref,
 309                         struct se_session, sess_kref);
 310         struct se_portal_group *se_tpg = se_sess->se_tpg;
 311
 312         se_tpg->se_tpg_tfo->close_session(se_sess);
 313 }
 314
 315 void target_get_session(struct se_session *se_sess)
 316 {
 317         kref_get(&se_sess->sess_kref);
 318 }
 319 EXPORT_SYMBOL(target_get_session);
 320
 321 void target_put_session(struct se_session *se_sess)
 322 {
 323         struct se_portal_group *tpg = se_sess->se_tpg;
 324
 325         if (tpg->se_tpg_tfo->put_session != NULL) {
 326                 tpg->se_tpg_tfo->put_session(se_sess);
 327                 return;
 328         }
 329         kref_put(&se_sess->sess_kref, target_release_session);
 330 }
 331 EXPORT_SYMBOL(target_put_session);
 332
 333 static void target_complete_nacl(struct kref *kref)
 334 {
 335         struct se_node_acl *nacl = container_of(kref,
 336                                 struct se_node_acl, acl_kref);
 337
 338         complete(&nacl->acl_free_comp);
 339 }
 340
 341 void target_put_nacl(struct se_node_acl *nacl)
 342 {
 343         kref_put(&nacl->acl_kref, target_complete_nacl);
 344 }
 345
 346 void transport_deregister_session_configfs(struct se_session *se_sess)
 347 {
 348         struct se_node_acl *se_nacl;
 349         unsigned long flags;
 350         /*
 351          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 352          */
 353         se_nacl = se_sess->se_node_acl;
 354         if (se_nacl) {
 355                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 356                 if (se_nacl->acl_stop == 0)
 357                         list_del(&se_sess->sess_acl_list);
 358                 /*
 359                  * If the session list is empty, then clear the pointer.
 360                  * Otherwise, set the struct se_session pointer from the tail
 361                  * element of the per struct se_node_acl active session list.
 362                  */
 363                 if (list_empty(&se_nacl->acl_sess_list))
 364                         se_nacl->nacl_sess = NULL;
 365                 else {
 366                         se_nacl->nacl_sess = container_of(
 367                                         se_nacl->acl_sess_list.prev,
 368                                         struct se_session, sess_acl_list);
 369                 }
 370                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 371         }
 372 }
 373 EXPORT_SYMBOL(transport_deregister_session_configfs);
 374
 375 void transport_free_session(struct se_session *se_sess)
 376 {
 377         kmem_cache_free(se_sess_cache, se_sess);
 378 }
 379 EXPORT_SYMBOL(transport_free_session);
 380
 381 void transport_deregister_session(struct se_session *se_sess)
 382 {
 383         struct se_portal_group *se_tpg = se_sess->se_tpg;
 384         struct target_core_fabric_ops *se_tfo;
 385         struct se_node_acl *se_nacl;
 386         unsigned long flags;
 387         bool comp_nacl = true;
 388
 389         if (!se_tpg) {
 390                 transport_free_session(se_sess);
 391                 return;
 392         }
 393         se_tfo = se_tpg->se_tpg_tfo;
 394
 395         spin_lock_irqsave(&se_tpg->session_lock, flags);
 396         list_del(&se_sess->sess_list);
 397         se_sess->se_tpg = NULL;
 398         se_sess->fabric_sess_ptr = NULL;
 399         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 400
 401         /*
 402          * Determine if we need to do extra work for this initiator node's
 403          * struct se_node_acl if it had been previously dynamically generated.
 404          */
 405         se_nacl = se_sess->se_node_acl;
 406
 407         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 408         if (se_nacl && se_nacl->dynamic_node_acl) {
 409                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 410                         list_del(&se_nacl->acl_list);
 411                         se_tpg->num_node_acls--;
 412                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 413                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 414                         core_free_device_list_for_node(se_nacl, se_tpg);
 415                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 416
 417                         comp_nacl = false;
 418                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 419                 }
 420         }
 421         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 422
 423         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 424                 se_tpg->se_tpg_tfo->get_fabric_name());
 425         /*
 426          * If last kref is dropping now for an explict NodeACL, awake sleeping
 427          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 428          * removal context.
 429          */
 430         if (se_nacl && comp_nacl == true)
 431                 target_put_nacl(se_nacl);
 432
 433         transport_free_session(se_sess);
 434 }
 435 EXPORT_SYMBOL(transport_deregister_session);
 436
 437 /*
 438  * Called with cmd->t_state_lock held.
 439  */
 440 static void target_remove_from_state_list(struct se_cmd *cmd)
 441 {
 442         struct se_device *dev = cmd->se_dev;
 443         unsigned long flags;
 444
 445         if (!dev)
 446                 return;
 447
 448         if (cmd->transport_state & CMD_T_BUSY)
 449                 return;
 450
 451         spin_lock_irqsave(&dev->execute_task_lock, flags);
 452         if (cmd->state_active) {
 453                 list_del(&cmd->state_list);
 454                 cmd->state_active = false;
 455         }
 456         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 457 }
 458
 459 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 460 {
 461         unsigned long flags;
 462
 463         spin_lock_irqsave(&cmd->t_state_lock, flags);
 464         /*
 465          * Determine if IOCTL context caller in requesting the stopping of this
 466          * command for LUN shutdown purposes.
 467          */
 468         if (cmd->transport_state & CMD_T_LUN_STOP) {
 469                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 470                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 471
 472                 cmd->transport_state &= ~CMD_T_ACTIVE;
 473                 if (remove_from_lists)
 474                         target_remove_from_state_list(cmd);
 475                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 476
 477                 complete(&cmd->transport_lun_stop_comp);
 478                 return 1;
 479         }
 480
 481         if (remove_from_lists) {
 482                 target_remove_from_state_list(cmd);
 483
 484                 /*
 485                  * Clear struct se_cmd->se_lun before the handoff to FE.
 486                  */
 487                 cmd->se_lun = NULL;
 488         }
 489
 490         /*
 491          * Determine if frontend context caller is requesting the stopping of
 492          * this command for frontend exceptions.
 493          */
 494         if (cmd->transport_state & CMD_T_STOP) {
 495                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 496                         __func__, __LINE__,
 497                         cmd->se_tfo->get_task_tag(cmd));
 498
 499                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 500
 501                 complete(&cmd->t_transport_stop_comp);
 502                 return 1;
 503         }
 504
 505         cmd->transport_state &= ~CMD_T_ACTIVE;
 506         if (remove_from_lists) {
 507                 /*
 508                  * Some fabric modules like tcm_loop can release
 509                  * their internally allocated I/O reference now and
 510                  * struct se_cmd now.
 511                  *
 512                  * Fabric modules are expected to return '1' here if the
 513                  * se_cmd being passed is released at this point,
 514                  * or zero if not being released.
 515                  */
 516                 if (cmd->se_tfo->check_stop_free != NULL) {
 517                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 518                         return cmd->se_tfo->check_stop_free(cmd);
 519                 }
 520         }
 521
 522         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 523         return 0;
 524 }
 525
 526 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 527 {
 528         return transport_cmd_check_stop(cmd, true);
 529 }
 530
 531 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 532 {
 533         struct se_lun *lun = cmd->se_lun;
 534         unsigned long flags;
 535
 536         if (!lun)
 537                 return;
 538
 539         spin_lock_irqsave(&cmd->t_state_lock, flags);
 540         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 541                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 542                 target_remove_from_state_list(cmd);
 543         }
 544         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 545
 546         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 547         if (!list_empty(&cmd->se_lun_node))
 548                 list_del_init(&cmd->se_lun_node);
 549         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 550 }
 551
 552 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 553 {
 554         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 555                 transport_lun_remove_cmd(cmd);
 556
 557         if (transport_cmd_check_stop_to_fabric(cmd))
 558                 return;
 559         if (remove)
 560                 transport_put_cmd(cmd);
 561 }
 562
 563 static void target_complete_failure_work(struct work_struct *work)
 564 {
 565         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 566
 567         transport_generic_request_failure(cmd);
 568 }
 569
 570 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 571 {
 572         struct se_device *dev = cmd->se_dev;
 573         int success = scsi_status == GOOD;
 574         unsigned long flags;
 575
 576         cmd->scsi_status = scsi_status;
 577
 578
 579         spin_lock_irqsave(&cmd->t_state_lock, flags);
 580         cmd->transport_state &= ~CMD_T_BUSY;
 581
 582         if (dev && dev->transport->transport_complete) {
 583                 if (dev->transport->transport_complete(cmd,
 584                                 cmd->t_data_sg) != 0) {
 585                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 586                         success = 1;
 587                 }
 588         }
 589
 590         /*
 591          * See if we are waiting to complete for an exception condition.
 592          */
 593         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 594                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 595                 complete(&cmd->task_stop_comp);
 596                 return;
 597         }
 598
 599         if (!success)
 600                 cmd->transport_state |= CMD_T_FAILED;
 601
 602         /*
 603          * Check for case where an explict ABORT_TASK has been received
 604          * and transport_wait_for_tasks() will be waiting for completion..
 605          */
 606         if (cmd->transport_state & CMD_T_ABORTED &&
 607             cmd->transport_state & CMD_T_STOP) {
 608                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 609                 complete(&cmd->t_transport_stop_comp);
 610                 return;
 611         } else if (cmd->transport_state & CMD_T_FAILED) {
 612                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 613                 INIT_WORK(&cmd->work, target_complete_failure_work);
 614         } else {
 615                 INIT_WORK(&cmd->work, target_complete_ok_work);
 616         }
 617
 618         cmd->t_state = TRANSPORT_COMPLETE;
 619         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 620         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 621
 622         queue_work(target_completion_wq, &cmd->work);
 623 }
 624 EXPORT_SYMBOL(target_complete_cmd);
 625
 626 static void target_add_to_state_list(struct se_cmd *cmd)
 627 {
 628         struct se_device *dev = cmd->se_dev;
 629         unsigned long flags;
 630
 631         spin_lock_irqsave(&dev->execute_task_lock, flags);
 632         if (!cmd->state_active) {
 633                 list_add_tail(&cmd->state_list, &dev->state_list);
 634                 cmd->state_active = true;
 635         }
 636         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 637 }
 638
 639 /*
 640  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 641  */
 642 static void transport_write_pending_qf(struct se_cmd *cmd);
 643 static void transport_complete_qf(struct se_cmd *cmd);
 644
 645 static void target_qf_do_work(struct work_struct *work)
 646 {
 647         struct se_device *dev = container_of(work, struct se_device,
 648                                         qf_work_queue);
 649         LIST_HEAD(qf_cmd_list);
 650         struct se_cmd *cmd, *cmd_tmp;
 651
 652         spin_lock_irq(&dev->qf_cmd_lock);
 653         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 654         spin_unlock_irq(&dev->qf_cmd_lock);
 655
 656         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 657                 list_del(&cmd->se_qf_node);
 658                 atomic_dec(&dev->dev_qf_count);
 659                 smp_mb__after_atomic_dec();
 660
 661                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 662                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 663                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 664                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 665                         : "UNKNOWN");
 666
 667                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 668                         transport_write_pending_qf(cmd);
 669                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 670                         transport_complete_qf(cmd);
 671         }
 672 }
 673
 674 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 675 {
 676         switch (cmd->data_direction) {
 677         case DMA_NONE:
 678                 return "NONE";
 679         case DMA_FROM_DEVICE:
 680                 return "READ";
 681         case DMA_TO_DEVICE:
 682                 return "WRITE";
 683         case DMA_BIDIRECTIONAL:
 684                 return "BIDI";
 685         default:
 686                 break;
 687         }
 688
 689         return "UNKNOWN";
 690 }
 691
 692 void transport_dump_dev_state(
 693         struct se_device *dev,
 694         char *b,
 695         int *bl)
 696 {
 697         *bl += sprintf(b + *bl, "Status: ");
 698         switch (dev->dev_status) {
 699         case TRANSPORT_DEVICE_ACTIVATED:
 700                 *bl += sprintf(b + *bl, "ACTIVATED");
 701                 break;
 702         case TRANSPORT_DEVICE_DEACTIVATED:
 703                 *bl += sprintf(b + *bl, "DEACTIVATED");
 704                 break;
 705         case TRANSPORT_DEVICE_SHUTDOWN:
 706                 *bl += sprintf(b + *bl, "SHUTDOWN");
 707                 break;
 708         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 709         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 710                 *bl += sprintf(b + *bl, "OFFLINE");
 711                 break;
 712         default:
 713                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 714                 break;
 715         }
 716
 717         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 718         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 719                 dev->se_sub_dev->se_dev_attrib.block_size,
 720                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 721         *bl += sprintf(b + *bl, "        ");
 722 }
 723
 724 void transport_dump_vpd_proto_id(
 725         struct t10_vpd *vpd,
 726         unsigned char *p_buf,
 727         int p_buf_len)
 728 {
 729         unsigned char buf[VPD_TMP_BUF_SIZE];
 730         int len;
 731
 732         memset(buf, 0, VPD_TMP_BUF_SIZE);
 733         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 734
 735         switch (vpd->protocol_identifier) {
 736         case 0x00:
 737                 sprintf(buf+len, "Fibre Channel\n");
 738                 break;
 739         case 0x10:
 740                 sprintf(buf+len, "Parallel SCSI\n");
 741                 break;
 742         case 0x20:
 743                 sprintf(buf+len, "SSA\n");
 744                 break;
 745         case 0x30:
 746                 sprintf(buf+len, "IEEE 1394\n");
 747                 break;
 748         case 0x40:
 749                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 750                                 " Protocol\n");
 751                 break;
 752         case 0x50:
 753                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 754                 break;
 755         case 0x60:
 756                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 757                 break;
 758         case 0x70:
 759                 sprintf(buf+len, "Automation/Drive Interface Transport"
 760                                 " Protocol\n");
 761                 break;
 762         case 0x80:
 763                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 764                 break;
 765         default:
 766                 sprintf(buf+len, "Unknown 0x%02x\n",
 767                                 vpd->protocol_identifier);
 768                 break;
 769         }
 770
 771         if (p_buf)
 772                 strncpy(p_buf, buf, p_buf_len);
 773         else
 774                 pr_debug("%s", buf);
 775 }
 776
 777 void
 778 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 779 {
 780         /*
 781          * Check if the Protocol Identifier Valid (PIV) bit is set..
 782          *
 783          * from spc3r23.pdf section 7.5.1
 784          */
 785          if (page_83[1] & 0x80) {
 786                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 787                 vpd->protocol_identifier_set = 1;
 788                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 789         }
 790 }
 791 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 792
 793 int transport_dump_vpd_assoc(
 794         struct t10_vpd *vpd,
 795         unsigned char *p_buf,
 796         int p_buf_len)
 797 {
 798         unsigned char buf[VPD_TMP_BUF_SIZE];
 799         int ret = 0;
 800         int len;
 801
 802         memset(buf, 0, VPD_TMP_BUF_SIZE);
 803         len = sprintf(buf, "T10 VPD Identifier Association: ");
 804
 805         switch (vpd->association) {
 806         case 0x00:
 807                 sprintf(buf+len, "addressed logical unit\n");
 808                 break;
 809         case 0x10:
 810                 sprintf(buf+len, "target port\n");
 811                 break;
 812         case 0x20:
 813                 sprintf(buf+len, "SCSI target device\n");
 814                 break;
 815         default:
 816                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 817                 ret = -EINVAL;
 818                 break;
 819         }
 820
 821         if (p_buf)
 822                 strncpy(p_buf, buf, p_buf_len);
 823         else
 824                 pr_debug("%s", buf);
 825
 826         return ret;
 827 }
 828
 829 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 830 {
 831         /*
 832          * The VPD identification association..
 833          *
 834          * from spc3r23.pdf Section 7.6.3.1 Table 297
 835          */
 836         vpd->association = (page_83[1] & 0x30);
 837         return transport_dump_vpd_assoc(vpd, NULL, 0);
 838 }
 839 EXPORT_SYMBOL(transport_set_vpd_assoc);
 840
 841 int transport_dump_vpd_ident_type(
 842         struct t10_vpd *vpd,
 843         unsigned char *p_buf,
 844         int p_buf_len)
 845 {
 846         unsigned char buf[VPD_TMP_BUF_SIZE];
 847         int ret = 0;
 848         int len;
 849
 850         memset(buf, 0, VPD_TMP_BUF_SIZE);
 851         len = sprintf(buf, "T10 VPD Identifier Type: ");
 852
 853         switch (vpd->device_identifier_type) {
 854         case 0x00:
 855                 sprintf(buf+len, "Vendor specific\n");
 856                 break;
 857         case 0x01:
 858                 sprintf(buf+len, "T10 Vendor ID based\n");
 859                 break;
 860         case 0x02:
 861                 sprintf(buf+len, "EUI-64 based\n");
 862                 break;
 863         case 0x03:
 864                 sprintf(buf+len, "NAA\n");
 865                 break;
 866         case 0x04:
 867                 sprintf(buf+len, "Relative target port identifier\n");
 868                 break;
 869         case 0x08:
 870                 sprintf(buf+len, "SCSI name string\n");
 871                 break;
 872         default:
 873                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 874                                 vpd->device_identifier_type);
 875                 ret = -EINVAL;
 876                 break;
 877         }
 878
 879         if (p_buf) {
 880                 if (p_buf_len < strlen(buf)+1)
 881                         return -EINVAL;
 882                 strncpy(p_buf, buf, p_buf_len);
 883         } else {
 884                 pr_debug("%s", buf);
 885         }
 886
 887         return ret;
 888 }
 889
 890 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 891 {
 892         /*
 893          * The VPD identifier type..
 894          *
 895          * from spc3r23.pdf Section 7.6.3.1 Table 298
 896          */
 897         vpd->device_identifier_type = (page_83[1] & 0x0f);
 898         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 899 }
 900 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 901
 902 int transport_dump_vpd_ident(
 903         struct t10_vpd *vpd,
 904         unsigned char *p_buf,
 905         int p_buf_len)
 906 {
 907         unsigned char buf[VPD_TMP_BUF_SIZE];
 908         int ret = 0;
 909
 910         memset(buf, 0, VPD_TMP_BUF_SIZE);
 911
 912         switch (vpd->device_identifier_code_set) {
 913         case 0x01: /* Binary */
 914                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 915                         &vpd->device_identifier[0]);
 916                 break;
 917         case 0x02: /* ASCII */
 918                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 919                         &vpd->device_identifier[0]);
 920                 break;
 921         case 0x03: /* UTF-8 */
 922                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 923                         &vpd->device_identifier[0]);
 924                 break;
 925         default:
 926                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 927                         " 0x%02x", vpd->device_identifier_code_set);
 928                 ret = -EINVAL;
 929                 break;
 930         }
 931
 932         if (p_buf)
 933                 strncpy(p_buf, buf, p_buf_len);
 934         else
 935                 pr_debug("%s", buf);
 936
 937         return ret;
 938 }
 939
 940 int
 941 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 942 {
 943         static const char hex_str[] = "0123456789abcdef";
 944         int j = 0, i = 4; /* offset to start of the identifer */
 945
 946         /*
 947          * The VPD Code Set (encoding)
 948          *
 949          * from spc3r23.pdf Section 7.6.3.1 Table 296
 950          */
 951         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
 952         switch (vpd->device_identifier_code_set) {
 953         case 0x01: /* Binary */
 954                 vpd->device_identifier[j++] =
 955                                 hex_str[vpd->device_identifier_type];
 956                 while (i < (4 + page_83[3])) {
 957                         vpd->device_identifier[j++] =
 958                                 hex_str[(page_83[i] & 0xf0) >> 4];
 959                         vpd->device_identifier[j++] =
 960                                 hex_str[page_83[i] & 0x0f];
 961                         i++;
 962                 }
 963                 break;
 964         case 0x02: /* ASCII */
 965         case 0x03: /* UTF-8 */
 966                 while (i < (4 + page_83[3]))
 967                         vpd->device_identifier[j++] = page_83[i++];
 968                 break;
 969         default:
 970                 break;
 971         }
 972
 973         return transport_dump_vpd_ident(vpd, NULL, 0);
 974 }
 975 EXPORT_SYMBOL(transport_set_vpd_ident);
 976
 977 static void core_setup_task_attr_emulation(struct se_device *dev)
 978 {
 979         /*
 980          * If this device is from Target_Core_Mod/pSCSI, disable the
 981          * SAM Task Attribute emulation.
 982          *
 983          * This is currently not available in upsream Linux/SCSI Target
 984          * mode code, and is assumed to be disabled while using TCM/pSCSI.
 985          */
 986         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 987                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
 988                 return;
 989         }
 990
 991         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
 992         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
 993                 " device\n", dev->transport->name,
 994                 dev->transport->get_device_rev(dev));
 995 }
 996
 997 static void scsi_dump_inquiry(struct se_device *dev)
 998 {
 999         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1000         char buf[17];
1001         int i, device_type;
1002         /*
1003          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1004          */
1005         for (i = 0; i < 8; i++)
1006                 if (wwn->vendor[i] >= 0x20)
1007                         buf[i] = wwn->vendor[i];
1008                 else
1009                         buf[i] = ' ';
1010         buf[i] = '\0';
1011         pr_debug("  Vendor: %s\n", buf);
1012
1013         for (i = 0; i < 16; i++)
1014                 if (wwn->model[i] >= 0x20)
1015                         buf[i] = wwn->model[i];
1016                 else
1017                         buf[i] = ' ';
1018         buf[i] = '\0';
1019         pr_debug("  Model: %s\n", buf);
1020
1021         for (i = 0; i < 4; i++)
1022                 if (wwn->revision[i] >= 0x20)
1023                         buf[i] = wwn->revision[i];
1024                 else
1025                         buf[i] = ' ';
1026         buf[i] = '\0';
1027         pr_debug("  Revision: %s\n", buf);
1028
1029         device_type = dev->transport->get_device_type(dev);
1030         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1031         pr_debug("                 ANSI SCSI revision: %02x\n",
1032                                 dev->transport->get_device_rev(dev));
1033 }
1034
1035 struct se_device *transport_add_device_to_core_hba(
1036         struct se_hba *hba,
1037         struct se_subsystem_api *transport,
1038         struct se_subsystem_dev *se_dev,
1039         u32 device_flags,
1040         void *transport_dev,
1041         struct se_dev_limits *dev_limits,
1042         const char *inquiry_prod,
1043         const char *inquiry_rev)
1044 {
1045         int force_pt;
1046         struct se_device  *dev;
1047
1048         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1049         if (!dev) {
1050                 pr_err("Unable to allocate memory for se_dev_t\n");
1051                 return NULL;
1052         }
1053
1054         dev->dev_flags          = device_flags;
1055         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1056         dev->dev_ptr            = transport_dev;
1057         dev->se_hba             = hba;
1058         dev->se_sub_dev         = se_dev;
1059         dev->transport          = transport;
1060         INIT_LIST_HEAD(&dev->dev_list);
1061         INIT_LIST_HEAD(&dev->dev_sep_list);
1062         INIT_LIST_HEAD(&dev->dev_tmr_list);
1063         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1064         INIT_LIST_HEAD(&dev->state_list);
1065         INIT_LIST_HEAD(&dev->qf_cmd_list);
1066         spin_lock_init(&dev->execute_task_lock);
1067         spin_lock_init(&dev->delayed_cmd_lock);
1068         spin_lock_init(&dev->dev_reservation_lock);
1069         spin_lock_init(&dev->dev_status_lock);
1070         spin_lock_init(&dev->se_port_lock);
1071         spin_lock_init(&dev->se_tmr_lock);
1072         spin_lock_init(&dev->qf_cmd_lock);
1073         atomic_set(&dev->dev_ordered_id, 0);
1074
1075         se_dev_set_default_attribs(dev, dev_limits);
1076
1077         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1078         dev->creation_time = get_jiffies_64();
1079         spin_lock_init(&dev->stats_lock);
1080
1081         spin_lock(&hba->device_lock);
1082         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1083         hba->dev_count++;
1084         spin_unlock(&hba->device_lock);
1085         /*
1086          * Setup the SAM Task Attribute emulation for struct se_device
1087          */
1088         core_setup_task_attr_emulation(dev);
1089         /*
1090          * Force PR and ALUA passthrough emulation with internal object use.
1091          */
1092         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1093         /*
1094          * Setup the Reservations infrastructure for struct se_device
1095          */
1096         core_setup_reservations(dev, force_pt);
1097         /*
1098          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1099          */
1100         if (core_setup_alua(dev, force_pt) < 0)
1101                 goto err_dev_list;
1102
1103         /*
1104          * Startup the struct se_device processing thread
1105          */
1106         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1107                                       dev->transport->name);
1108         if (!dev->tmr_wq) {
1109                 pr_err("Unable to create tmr workqueue for %s\n",
1110                         dev->transport->name);
1111                 goto err_dev_list;
1112         }
1113         /*
1114          * Setup work_queue for QUEUE_FULL
1115          */
1116         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1117         /*
1118          * Preload the initial INQUIRY const values if we are doing
1119          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1120          * passthrough because this is being provided by the backend LLD.
1121          * This is required so that transport_get_inquiry() copies these
1122          * originals once back into DEV_T10_WWN(dev) for the virtual device
1123          * setup.
1124          */
1125         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1126                 if (!inquiry_prod || !inquiry_rev) {
1127                         pr_err("All non TCM/pSCSI plugins require"
1128                                 " INQUIRY consts\n");
1129                         goto err_wq;
1130                 }
1131
1132                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1133                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1134                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1135         }
1136         scsi_dump_inquiry(dev);
1137
1138         return dev;
1139
1140 err_wq:
1141         destroy_workqueue(dev->tmr_wq);
1142 err_dev_list:
1143         spin_lock(&hba->device_lock);
1144         list_del(&dev->dev_list);
1145         hba->dev_count--;
1146         spin_unlock(&hba->device_lock);
1147
1148         se_release_vpd_for_dev(dev);
1149
1150         kfree(dev);
1151
1152         return NULL;
1153 }
1154 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1155
1156 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1157 {
1158         struct se_device *dev = cmd->se_dev;
1159
1160         if (cmd->unknown_data_length) {
1161                 cmd->data_length = size;
1162         } else if (size != cmd->data_length) {
1163                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1164                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1167
1168                 if (cmd->data_direction == DMA_TO_DEVICE) {
1169                         pr_err("Rejecting underflow/overflow"
1170                                         " WRITE data\n");
1171                         goto out_invalid_cdb_field;
1172                 }
1173                 /*
1174                  * Reject READ_* or WRITE_* with overflow/underflow for
1175                  * type SCF_SCSI_DATA_CDB.
1176                  */
1177                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1178                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1179                                 " CDB on non 512-byte sector setup subsystem"
1180                                 " plugin: %s\n", dev->transport->name);
1181                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1182                         goto out_invalid_cdb_field;
1183                 }
1184
1185                 if (size > cmd->data_length) {
1186                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1187                         cmd->residual_count = (size - cmd->data_length);
1188                 } else {
1189                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1190                         cmd->residual_count = (cmd->data_length - size);
1191                 }
1192                 cmd->data_length = size;
1193         }
1194
1195         return 0;
1196
1197 out_invalid_cdb_field:
1198         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1199         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1200         return -EINVAL;
1201 }
1202
1203 /*
1204  * Used by fabric modules containing a local struct se_cmd within their
1205  * fabric dependent per I/O descriptor.
1206  */
1207 void transport_init_se_cmd(
1208         struct se_cmd *cmd,
1209         struct target_core_fabric_ops *tfo,
1210         struct se_session *se_sess,
1211         u32 data_length,
1212         int data_direction,
1213         int task_attr,
1214         unsigned char *sense_buffer)
1215 {
1216         INIT_LIST_HEAD(&cmd->se_lun_node);
1217         INIT_LIST_HEAD(&cmd->se_delayed_node);
1218         INIT_LIST_HEAD(&cmd->se_qf_node);
1219         INIT_LIST_HEAD(&cmd->se_cmd_list);
1220         INIT_LIST_HEAD(&cmd->state_list);
1221         init_completion(&cmd->transport_lun_fe_stop_comp);
1222         init_completion(&cmd->transport_lun_stop_comp);
1223         init_completion(&cmd->t_transport_stop_comp);
1224         init_completion(&cmd->cmd_wait_comp);
1225         init_completion(&cmd->task_stop_comp);
1226         spin_lock_init(&cmd->t_state_lock);
1227         cmd->transport_state = CMD_T_DEV_ACTIVE;
1228
1229         cmd->se_tfo = tfo;
1230         cmd->se_sess = se_sess;
1231         cmd->data_length = data_length;
1232         cmd->data_direction = data_direction;
1233         cmd->sam_task_attr = task_attr;
1234         cmd->sense_buffer = sense_buffer;
1235
1236         cmd->state_active = false;
1237 }
1238 EXPORT_SYMBOL(transport_init_se_cmd);
1239
1240 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1241 {
1242         /*
1243          * Check if SAM Task Attribute emulation is enabled for this
1244          * struct se_device storage object
1245          */
1246         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1247                 return 0;
1248
1249         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1250                 pr_debug("SAM Task Attribute ACA"
1251                         " emulation is not supported\n");
1252                 return -EINVAL;
1253         }
1254         /*
1255          * Used to determine when ORDERED commands should go from
1256          * Dormant to Active status.
1257          */
1258         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1259         smp_mb__after_atomic_inc();
1260         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1261                         cmd->se_ordered_id, cmd->sam_task_attr,
1262                         cmd->se_dev->transport->name);
1263         return 0;
1264 }
1265
1266 /*      target_setup_cmd_from_cdb():
1267  *
1268  *      Called from fabric RX Thread.
1269  */
1270 int target_setup_cmd_from_cdb(
1271         struct se_cmd *cmd,
1272         unsigned char *cdb)
1273 {
1274         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1275         u32 pr_reg_type = 0;
1276         u8 alua_ascq = 0;
1277         unsigned long flags;
1278         int ret;
1279
1280         /*
1281          * Ensure that the received CDB is less than the max (252 + 8) bytes
1282          * for VARIABLE_LENGTH_CMD
1283          */
1284         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1285                 pr_err("Received SCSI CDB with command_size: %d that"
1286                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1287                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1288                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1289                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1290                 return -EINVAL;
1291         }
1292         /*
1293          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1294          * allocate the additional extended CDB buffer now..  Otherwise
1295          * setup the pointer from __t_task_cdb to t_task_cdb.
1296          */
1297         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1298                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1299                                                 GFP_KERNEL);
1300                 if (!cmd->t_task_cdb) {
1301                         pr_err("Unable to allocate cmd->t_task_cdb"
1302                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1303                                 scsi_command_size(cdb),
1304                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1305                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1306                         cmd->scsi_sense_reason =
1307                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1308                         return -ENOMEM;
1309                 }
1310         } else
1311                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1312         /*
1313          * Copy the original CDB into cmd->
1314          */
1315         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1316
1317         /*
1318          * Check for an existing UNIT ATTENTION condition
1319          */
1320         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1321                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1322                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1323                 return -EINVAL;
1324         }
1325
1326         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1327         if (ret != 0) {
1328                 /*
1329                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1330                  * The ALUA additional sense code qualifier (ASCQ) is determined
1331                  * by the ALUA primary or secondary access state..
1332                  */
1333                 if (ret > 0) {
1334                         pr_debug("[%s]: ALUA TG Port not available, "
1335                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1336                                 "0x04/0x%02x\n",
1337                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1338
1339                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1340                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1341                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1342                         return -EINVAL;
1343                 }
1344                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1345                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1346                 return -EINVAL;
1347         }
1348
1349         /*
1350          * Check status for SPC-3 Persistent Reservations
1351          */
1352         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1353                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1354                                         cmd, cdb, pr_reg_type) != 0) {
1355                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1356                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1357                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1358                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1359                         return -EBUSY;
1360                 }
1361                 /*
1362                  * This means the CDB is allowed for the SCSI Initiator port
1363                  * when said port is *NOT* holding the legacy SPC-2 or
1364                  * SPC-3 Persistent Reservation.
1365                  */
1366         }
1367
1368         ret = cmd->se_dev->transport->parse_cdb(cmd);
1369         if (ret < 0)
1370                 return ret;
1371
1372         spin_lock_irqsave(&cmd->t_state_lock, flags);
1373         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1374         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1375
1376         /*
1377          * Check for SAM Task Attribute Emulation
1378          */
1379         if (transport_check_alloc_task_attr(cmd) < 0) {
1380                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1381                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1382                 return -EINVAL;
1383         }
1384         spin_lock(&cmd->se_lun->lun_sep_lock);
1385         if (cmd->se_lun->lun_sep)
1386                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1387         spin_unlock(&cmd->se_lun->lun_sep_lock);
1388         return 0;
1389 }
1390 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1391
1392 /*
1393  * Used by fabric module frontends to queue tasks directly.
1394  * Many only be used from process context only
1395  */
1396 int transport_handle_cdb_direct(
1397         struct se_cmd *cmd)
1398 {
1399         int ret;
1400
1401         if (!cmd->se_lun) {
1402                 dump_stack();
1403                 pr_err("cmd->se_lun is NULL\n");
1404                 return -EINVAL;
1405         }
1406         if (in_interrupt()) {
1407                 dump_stack();
1408                 pr_err("transport_generic_handle_cdb cannot be called"
1409                                 " from interrupt context\n");
1410                 return -EINVAL;
1411         }
1412         /*
1413          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1414          * outstanding descriptors are handled correctly during shutdown via
1415          * transport_wait_for_tasks()
1416          *
1417          * Also, we don't take cmd->t_state_lock here as we only expect
1418          * this to be called for initial descriptor submission.
1419          */
1420         cmd->t_state = TRANSPORT_NEW_CMD;
1421         cmd->transport_state |= CMD_T_ACTIVE;
1422
1423         /*
1424          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1425          * so follow TRANSPORT_NEW_CMD processing thread context usage
1426          * and call transport_generic_request_failure() if necessary..
1427          */
1428         ret = transport_generic_new_cmd(cmd);
1429         if (ret < 0)
1430                 transport_generic_request_failure(cmd);
1431
1432         return 0;
1433 }
1434 EXPORT_SYMBOL(transport_handle_cdb_direct);
1435
1436 /**
1437  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1438  *
1439  * @se_cmd: command descriptor to submit
1440  * @se_sess: associated se_sess for endpoint
1441  * @cdb: pointer to SCSI CDB
1442  * @sense: pointer to SCSI sense buffer
1443  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1444  * @data_length: fabric expected data transfer length
1445  * @task_addr: SAM task attribute
1446  * @data_dir: DMA data direction
1447  * @flags: flags for command submission from target_sc_flags_tables
1448  *
1449  * Returns non zero to signal active I/O shutdown failure.  All other
1450  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1451  * but still return zero here.
1452  *
1453  * This may only be called from process context, and also currently
1454  * assumes internal allocation of fabric payload buffer by target-core.
1455  **/
1456 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1457                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1458                 u32 data_length, int task_attr, int data_dir, int flags)
1459 {
1460         struct se_portal_group *se_tpg;
1461         int rc;
1462
1463         se_tpg = se_sess->se_tpg;
1464         BUG_ON(!se_tpg);
1465         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1466         BUG_ON(in_interrupt());
1467         /*
1468          * Initialize se_cmd for target operation.  From this point
1469          * exceptions are handled by sending exception status via
1470          * target_core_fabric_ops->queue_status() callback
1471          */
1472         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1473                                 data_length, data_dir, task_attr, sense);
1474         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1475                 se_cmd->unknown_data_length = 1;
1476         /*
1477          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1478          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1479          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1480          * kref_put() to happen during fabric packet acknowledgement.
1481          */
1482         rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1483         if (rc)
1484                 return rc;
1485         /*
1486          * Signal bidirectional data payloads to target-core
1487          */
1488         if (flags & TARGET_SCF_BIDI_OP)
1489                 se_cmd->se_cmd_flags |= SCF_BIDI;
1490         /*
1491          * Locate se_lun pointer and attach it to struct se_cmd
1492          */
1493         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1494                 transport_send_check_condition_and_sense(se_cmd,
1495                                 se_cmd->scsi_sense_reason, 0);
1496                 target_put_sess_cmd(se_sess, se_cmd);
1497                 return 0;
1498         }
1499
1500         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1501         if (rc != 0) {
1502                 transport_generic_request_failure(se_cmd);
1503                 return 0;
1504         }
1505
1506         /*
1507          * Check if we need to delay processing because of ALUA
1508          * Active/NonOptimized primary access state..
1509          */
1510         core_alua_check_nonop_delay(se_cmd);
1511
1512         transport_handle_cdb_direct(se_cmd);
1513         return 0;
1514 }
1515 EXPORT_SYMBOL(target_submit_cmd);
1516
1517 static void target_complete_tmr_failure(struct work_struct *work)
1518 {
1519         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1520
1521         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1522         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1523         transport_generic_free_cmd(se_cmd, 0);
1524 }
1525
1526 /**
1527  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1528  *                     for TMR CDBs
1529  *
1530  * @se_cmd: command descriptor to submit
1531  * @se_sess: associated se_sess for endpoint
1532  * @sense: pointer to SCSI sense buffer
1533  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1534  * @fabric_context: fabric context for TMR req
1535  * @tm_type: Type of TM request
1536  * @gfp: gfp type for caller
1537  * @tag: referenced task tag for TMR_ABORT_TASK
1538  * @flags: submit cmd flags
1539  *
1540  * Callable from all contexts.
1541  **/
1542
1543 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1544                 unsigned char *sense, u32 unpacked_lun,
1545                 void *fabric_tmr_ptr, unsigned char tm_type,
1546                 gfp_t gfp, unsigned int tag, int flags)
1547 {
1548         struct se_portal_group *se_tpg;
1549         int ret;
1550
1551         se_tpg = se_sess->se_tpg;
1552         BUG_ON(!se_tpg);
1553
1554         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1555                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1556         /*
1557          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1558          * allocation failure.
1559          */
1560         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1561         if (ret < 0)
1562                 return -ENOMEM;
1563
1564         if (tm_type == TMR_ABORT_TASK)
1565                 se_cmd->se_tmr_req->ref_task_tag = tag;
1566
1567         /* See target_submit_cmd for commentary */
1568         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1569         if (ret) {
1570                 core_tmr_release_req(se_cmd->se_tmr_req);
1571                 return ret;
1572         }
1573
1574         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1575         if (ret) {
1576                 /*
1577                  * For callback during failure handling, push this work off
1578                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1579                  */
1580                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1581                 schedule_work(&se_cmd->work);
1582                 return 0;
1583         }
1584         transport_generic_handle_tmr(se_cmd);
1585         return 0;
1586 }
1587 EXPORT_SYMBOL(target_submit_tmr);
1588
1589 /*
1590  * If the cmd is active, request it to be stopped and sleep until it
1591  * has completed.
1592  */
1593 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1594 {
1595         bool was_active = false;
1596
1597         if (cmd->transport_state & CMD_T_BUSY) {
1598                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1599                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1600
1601                 pr_debug("cmd %p waiting to complete\n", cmd);
1602                 wait_for_completion(&cmd->task_stop_comp);
1603                 pr_debug("cmd %p stopped successfully\n", cmd);
1604
1605                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1606                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1607                 cmd->transport_state &= ~CMD_T_BUSY;
1608                 was_active = true;
1609         }
1610
1611         return was_active;
1612 }
1613
1614 /*
1615  * Handle SAM-esque emulation for generic transport request failures.
1616  */
1617 void transport_generic_request_failure(struct se_cmd *cmd)
1618 {
1619         int ret = 0;
1620
1621         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1622                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1623                 cmd->t_task_cdb[0]);
1624         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1625                 cmd->se_tfo->get_cmd_state(cmd),
1626                 cmd->t_state, cmd->scsi_sense_reason);
1627         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1628                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1629                 (cmd->transport_state & CMD_T_STOP) != 0,
1630                 (cmd->transport_state & CMD_T_SENT) != 0);
1631
1632         /*
1633          * For SAM Task Attribute emulation for failed struct se_cmd
1634          */
1635         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1636                 transport_complete_task_attr(cmd);
1637
1638         switch (cmd->scsi_sense_reason) {
1639         case TCM_NON_EXISTENT_LUN:
1640         case TCM_UNSUPPORTED_SCSI_OPCODE:
1641         case TCM_INVALID_CDB_FIELD:
1642         case TCM_INVALID_PARAMETER_LIST:
1643         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1644         case TCM_UNKNOWN_MODE_PAGE:
1645         case TCM_WRITE_PROTECTED:
1646         case TCM_ADDRESS_OUT_OF_RANGE:
1647         case TCM_CHECK_CONDITION_ABORT_CMD:
1648         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1649         case TCM_CHECK_CONDITION_NOT_READY:
1650                 break;
1651         case TCM_RESERVATION_CONFLICT:
1652                 /*
1653                  * No SENSE Data payload for this case, set SCSI Status
1654                  * and queue the response to $FABRIC_MOD.
1655                  *
1656                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1657                  */
1658                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1659                 /*
1660                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1661                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1662                  * CONFLICT STATUS.
1663                  *
1664                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1665                  */
1666                 if (cmd->se_sess &&
1667                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1668                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1669                                 cmd->orig_fe_lun, 0x2C,
1670                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1671
1672                 ret = cmd->se_tfo->queue_status(cmd);
1673                 if (ret == -EAGAIN || ret == -ENOMEM)
1674                         goto queue_full;
1675                 goto check_stop;
1676         default:
1677                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1678                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1679                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1680                 break;
1681         }
1682
1683         ret = transport_send_check_condition_and_sense(cmd,
1684                         cmd->scsi_sense_reason, 0);
1685         if (ret == -EAGAIN || ret == -ENOMEM)
1686                 goto queue_full;
1687
1688 check_stop:
1689         transport_lun_remove_cmd(cmd);
1690         if (!transport_cmd_check_stop_to_fabric(cmd))
1691                 ;
1692         return;
1693
1694 queue_full:
1695         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1696         transport_handle_queue_full(cmd, cmd->se_dev);
1697 }
1698 EXPORT_SYMBOL(transport_generic_request_failure);
1699
1700 static void __target_execute_cmd(struct se_cmd *cmd)
1701 {
1702         int error = 0;
1703
1704         spin_lock_irq(&cmd->t_state_lock);
1705         cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1706         spin_unlock_irq(&cmd->t_state_lock);
1707
1708         if (cmd->execute_cmd)
1709                 error = cmd->execute_cmd(cmd);
1710
1711         if (error) {
1712                 spin_lock_irq(&cmd->t_state_lock);
1713                 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1714                 spin_unlock_irq(&cmd->t_state_lock);
1715
1716                 transport_generic_request_failure(cmd);
1717         }
1718 }
1719
1720 void target_execute_cmd(struct se_cmd *cmd)
1721 {
1722         struct se_device *dev = cmd->se_dev;
1723
1724         /*
1725          * If the received CDB has aleady been aborted stop processing it here.
1726          */
1727         if (transport_check_aborted_status(cmd, 1))
1728                 return;
1729
1730         /*
1731          * Determine if IOCTL context caller in requesting the stopping of this
1732          * command for LUN shutdown purposes.
1733          */
1734         spin_lock_irq(&cmd->t_state_lock);
1735         if (cmd->transport_state & CMD_T_LUN_STOP) {
1736                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1737                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1738
1739                 cmd->transport_state &= ~CMD_T_ACTIVE;
1740                 spin_unlock_irq(&cmd->t_state_lock);
1741                 complete(&cmd->transport_lun_stop_comp);
1742                 return;
1743         }
1744         /*
1745          * Determine if frontend context caller is requesting the stopping of
1746          * this command for frontend exceptions.
1747          */
1748         if (cmd->transport_state & CMD_T_STOP) {
1749                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1750                         __func__, __LINE__,
1751                         cmd->se_tfo->get_task_tag(cmd));
1752
1753                 spin_unlock_irq(&cmd->t_state_lock);
1754                 complete(&cmd->t_transport_stop_comp);
1755                 return;
1756         }
1757
1758         cmd->t_state = TRANSPORT_PROCESSING;
1759         spin_unlock_irq(&cmd->t_state_lock);
1760
1761         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1762                 goto execute;
1763
1764         /*
1765          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1766          * to allow the passed struct se_cmd list of tasks to the front of the list.
1767          */
1768         switch (cmd->sam_task_attr) {
1769         case MSG_HEAD_TAG:
1770                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1771                          "se_ordered_id: %u\n",
1772                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1773                 goto execute;
1774         case MSG_ORDERED_TAG:
1775                 atomic_inc(&dev->dev_ordered_sync);
1776                 smp_mb__after_atomic_inc();
1777
1778                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1779                          " se_ordered_id: %u\n",
1780                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1781
1782                 /*
1783                  * Execute an ORDERED command if no other older commands
1784                  * exist that need to be completed first.
1785                  */
1786                 if (!atomic_read(&dev->simple_cmds))
1787                         goto execute;
1788                 break;
1789         default:
1790                 /*
1791                  * For SIMPLE and UNTAGGED Task Attribute commands
1792                  */
1793                 atomic_inc(&dev->simple_cmds);
1794                 smp_mb__after_atomic_inc();
1795                 break;
1796         }
1797
1798         if (atomic_read(&dev->dev_ordered_sync) != 0) {
1799                 spin_lock(&dev->delayed_cmd_lock);
1800                 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1801                 spin_unlock(&dev->delayed_cmd_lock);
1802
1803                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1804                         " delayed CMD list, se_ordered_id: %u\n",
1805                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1806                         cmd->se_ordered_id);
1807                 return;
1808         }
1809
1810 execute:
1811         /*
1812          * Otherwise, no ORDERED task attributes exist..
1813          */
1814         __target_execute_cmd(cmd);
1815 }
1816 EXPORT_SYMBOL(target_execute_cmd);
1817
1818 /*
1819  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1820  */
1821 static int transport_get_sense_data(struct se_cmd *cmd)
1822 {
1823         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1824         struct se_device *dev = cmd->se_dev;
1825         unsigned long flags;
1826         u32 offset = 0;
1827
1828         WARN_ON(!cmd->se_lun);
1829
1830         if (!dev)
1831                 return 0;
1832
1833         spin_lock_irqsave(&cmd->t_state_lock, flags);
1834         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1835                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1836                 return 0;
1837         }
1838
1839         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1840                 goto out;
1841
1842         if (!dev->transport->get_sense_buffer) {
1843                 pr_err("dev->transport->get_sense_buffer is NULL\n");
1844                 goto out;
1845         }
1846
1847         sense_buffer = dev->transport->get_sense_buffer(cmd);
1848         if (!sense_buffer) {
1849                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1850                         " sense buffer for task with sense\n",
1851                         cmd->se_tfo->get_task_tag(cmd), cmd);
1852                 goto out;
1853         }
1854
1855         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1856
1857         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1858
1859         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1860
1861         /* Automatically padded */
1862         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1863
1864         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1865                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1866         return 0;
1867
1868 out:
1869         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1870         return -1;
1871 }
1872
1873 /*
1874  * Process all commands up to the last received ORDERED task attribute which
1875  * requires another blocking boundary
1876  */
1877 static void target_restart_delayed_cmds(struct se_device *dev)
1878 {
1879         for (;;) {
1880                 struct se_cmd *cmd;
1881
1882                 spin_lock(&dev->delayed_cmd_lock);
1883                 if (list_empty(&dev->delayed_cmd_list)) {
1884                         spin_unlock(&dev->delayed_cmd_lock);
1885                         break;
1886                 }
1887
1888                 cmd = list_entry(dev->delayed_cmd_list.next,
1889                                  struct se_cmd, se_delayed_node);
1890                 list_del(&cmd->se_delayed_node);
1891                 spin_unlock(&dev->delayed_cmd_lock);
1892
1893                 __target_execute_cmd(cmd);
1894
1895                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1896                         break;
1897         }
1898 }
1899
1900 /*
1901  * Called from I/O completion to determine which dormant/delayed
1902  * and ordered cmds need to have their tasks added to the execution queue.
1903  */
1904 static void transport_complete_task_attr(struct se_cmd *cmd)
1905 {
1906         struct se_device *dev = cmd->se_dev;
1907
1908         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1909                 atomic_dec(&dev->simple_cmds);
1910                 smp_mb__after_atomic_dec();
1911                 dev->dev_cur_ordered_id++;
1912                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1913                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1914                         cmd->se_ordered_id);
1915         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1916                 dev->dev_cur_ordered_id++;
1917                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1918                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1919                         cmd->se_ordered_id);
1920         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1921                 atomic_dec(&dev->dev_ordered_sync);
1922                 smp_mb__after_atomic_dec();
1923
1924                 dev->dev_cur_ordered_id++;
1925                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1926                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1927         }
1928
1929         target_restart_delayed_cmds(dev);
1930 }
1931
1932 static void transport_complete_qf(struct se_cmd *cmd)
1933 {
1934         int ret = 0;
1935
1936         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1937                 transport_complete_task_attr(cmd);
1938
1939         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1940                 ret = cmd->se_tfo->queue_status(cmd);
1941                 if (ret)
1942                         goto out;
1943         }
1944
1945         switch (cmd->data_direction) {
1946         case DMA_FROM_DEVICE:
1947                 ret = cmd->se_tfo->queue_data_in(cmd);
1948                 break;
1949         case DMA_TO_DEVICE:
1950                 if (cmd->t_bidi_data_sg) {
1951                         ret = cmd->se_tfo->queue_data_in(cmd);
1952                         if (ret < 0)
1953                                 break;
1954                 }
1955                 /* Fall through for DMA_TO_DEVICE */
1956         case DMA_NONE:
1957                 ret = cmd->se_tfo->queue_status(cmd);
1958                 break;
1959         default:
1960                 break;
1961         }
1962
1963 out:
1964         if (ret < 0) {
1965                 transport_handle_queue_full(cmd, cmd->se_dev);
1966                 return;
1967         }
1968         transport_lun_remove_cmd(cmd);
1969         transport_cmd_check_stop_to_fabric(cmd);
1970 }
1971
1972 static void transport_handle_queue_full(
1973         struct se_cmd *cmd,
1974         struct se_device *dev)
1975 {
1976         spin_lock_irq(&dev->qf_cmd_lock);
1977         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1978         atomic_inc(&dev->dev_qf_count);
1979         smp_mb__after_atomic_inc();
1980         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1981
1982         schedule_work(&cmd->se_dev->qf_work_queue);
1983 }
1984
1985 static void target_complete_ok_work(struct work_struct *work)
1986 {
1987         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1988         int reason = 0, ret;
1989
1990         /*
1991          * Check if we need to move delayed/dormant tasks from cmds on the
1992          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1993          * Attribute.
1994          */
1995         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1996                 transport_complete_task_attr(cmd);
1997         /*
1998          * Check to schedule QUEUE_FULL work, or execute an existing
1999          * cmd->transport_qf_callback()
2000          */
2001         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2002                 schedule_work(&cmd->se_dev->qf_work_queue);
2003
2004         /*
2005          * Check if we need to retrieve a sense buffer from
2006          * the struct se_cmd in question.
2007          */
2008         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2009                 if (transport_get_sense_data(cmd) < 0)
2010                         reason = TCM_NON_EXISTENT_LUN;
2011
2012                 if (cmd->scsi_status) {
2013                         ret = transport_send_check_condition_and_sense(
2014                                         cmd, reason, 1);
2015                         if (ret == -EAGAIN || ret == -ENOMEM)
2016                                 goto queue_full;
2017
2018                         transport_lun_remove_cmd(cmd);
2019                         transport_cmd_check_stop_to_fabric(cmd);
2020                         return;
2021                 }
2022         }
2023         /*
2024          * Check for a callback, used by amongst other things
2025          * XDWRITE_READ_10 emulation.
2026          */
2027         if (cmd->transport_complete_callback)
2028                 cmd->transport_complete_callback(cmd);
2029
2030         switch (cmd->data_direction) {
2031         case DMA_FROM_DEVICE:
2032                 spin_lock(&cmd->se_lun->lun_sep_lock);
2033                 if (cmd->se_lun->lun_sep) {
2034                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2035                                         cmd->data_length;
2036                 }
2037                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2038
2039                 ret = cmd->se_tfo->queue_data_in(cmd);
2040                 if (ret == -EAGAIN || ret == -ENOMEM)
2041                         goto queue_full;
2042                 break;
2043         case DMA_TO_DEVICE:
2044                 spin_lock(&cmd->se_lun->lun_sep_lock);
2045                 if (cmd->se_lun->lun_sep) {
2046                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2047                                 cmd->data_length;
2048                 }
2049                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2050                 /*
2051                  * Check if we need to send READ payload for BIDI-COMMAND
2052                  */
2053                 if (cmd->t_bidi_data_sg) {
2054                         spin_lock(&cmd->se_lun->lun_sep_lock);
2055                         if (cmd->se_lun->lun_sep) {
2056                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2057                                         cmd->data_length;
2058                         }
2059                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2060                         ret = cmd->se_tfo->queue_data_in(cmd);
2061                         if (ret == -EAGAIN || ret == -ENOMEM)
2062                                 goto queue_full;
2063                         break;
2064                 }
2065                 /* Fall through for DMA_TO_DEVICE */
2066         case DMA_NONE:
2067                 ret = cmd->se_tfo->queue_status(cmd);
2068                 if (ret == -EAGAIN || ret == -ENOMEM)
2069                         goto queue_full;
2070                 break;
2071         default:
2072                 break;
2073         }
2074
2075         transport_lun_remove_cmd(cmd);
2076         transport_cmd_check_stop_to_fabric(cmd);
2077         return;
2078
2079 queue_full:
2080         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2081                 " data_direction: %d\n", cmd, cmd->data_direction);
2082         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2083         transport_handle_queue_full(cmd, cmd->se_dev);
2084 }
2085
2086 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2087 {
2088         struct scatterlist *sg;
2089         int count;
2090
2091         for_each_sg(sgl, sg, nents, count)
2092                 __free_page(sg_page(sg));
2093
2094         kfree(sgl);
2095 }
2096
2097 static inline void transport_free_pages(struct se_cmd *cmd)
2098 {
2099         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2100                 return;
2101
2102         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2103         cmd->t_data_sg = NULL;
2104         cmd->t_data_nents = 0;
2105
2106         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2107         cmd->t_bidi_data_sg = NULL;
2108         cmd->t_bidi_data_nents = 0;
2109 }
2110
2111 /**
2112  * transport_release_cmd - free a command
2113  * @cmd:       command to free
2114  *
2115  * This routine unconditionally frees a command, and reference counting
2116  * or list removal must be done in the caller.
2117  */
2118 static void transport_release_cmd(struct se_cmd *cmd)
2119 {
2120         BUG_ON(!cmd->se_tfo);
2121
2122         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2123                 core_tmr_release_req(cmd->se_tmr_req);
2124         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2125                 kfree(cmd->t_task_cdb);
2126         /*
2127          * If this cmd has been setup with target_get_sess_cmd(), drop
2128          * the kref and call ->release_cmd() in kref callback.
2129          */
2130          if (cmd->check_release != 0) {
2131                 target_put_sess_cmd(cmd->se_sess, cmd);
2132                 return;
2133         }
2134         cmd->se_tfo->release_cmd(cmd);
2135 }
2136
2137 /**
2138  * transport_put_cmd - release a reference to a command
2139  * @cmd:       command to release
2140  *
2141  * This routine releases our reference to the command and frees it if possible.
2142  */
2143 static void transport_put_cmd(struct se_cmd *cmd)
2144 {
2145         unsigned long flags;
2146
2147         spin_lock_irqsave(&cmd->t_state_lock, flags);
2148         if (atomic_read(&cmd->t_fe_count)) {
2149                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2150                         goto out_busy;
2151         }
2152
2153         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2154                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2155                 target_remove_from_state_list(cmd);
2156         }
2157         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2158
2159         transport_free_pages(cmd);
2160         transport_release_cmd(cmd);
2161         return;
2162 out_busy:
2163         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2164 }
2165
2166 /*
2167  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2168  * allocating in the core.
2169  * @cmd:  Associated se_cmd descriptor
2170  * @mem:  SGL style memory for TCM WRITE / READ
2171  * @sg_mem_num: Number of SGL elements
2172  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2173  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2174  *
2175  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2176  * of parameters.
2177  */
2178 int transport_generic_map_mem_to_cmd(
2179         struct se_cmd *cmd,
2180         struct scatterlist *sgl,
2181         u32 sgl_count,
2182         struct scatterlist *sgl_bidi,
2183         u32 sgl_bidi_count)
2184 {
2185         if (!sgl || !sgl_count)
2186                 return 0;
2187
2188         /*
2189          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2190          * scatterlists already have been set to follow what the fabric
2191          * passes for the original expected data transfer length.
2192          */
2193         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2194                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2195                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2196                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2197                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2198                 return -EINVAL;
2199         }
2200
2201         cmd->t_data_sg = sgl;
2202         cmd->t_data_nents = sgl_count;
2203
2204         if (sgl_bidi && sgl_bidi_count) {
2205                 cmd->t_bidi_data_sg = sgl_bidi;
2206                 cmd->t_bidi_data_nents = sgl_bidi_count;
2207         }
2208         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2209         return 0;
2210 }
2211 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2212
2213 void *transport_kmap_data_sg(struct se_cmd *cmd)
2214 {
2215         struct scatterlist *sg = cmd->t_data_sg;
2216         struct page **pages;
2217         int i;
2218
2219         BUG_ON(!sg);
2220         /*
2221          * We need to take into account a possible offset here for fabrics like
2222          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2223          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2224          */
2225         if (!cmd->t_data_nents)
2226                 return NULL;
2227         else if (cmd->t_data_nents == 1)
2228                 return kmap(sg_page(sg)) + sg->offset;
2229
2230         /* >1 page. use vmap */
2231         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2232         if (!pages)
2233                 return NULL;
2234
2235         /* convert sg[] to pages[] */
2236         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2237                 pages[i] = sg_page(sg);
2238         }
2239
2240         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2241         kfree(pages);
2242         if (!cmd->t_data_vmap)
2243                 return NULL;
2244
2245         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2246 }
2247 EXPORT_SYMBOL(transport_kmap_data_sg);
2248
2249 void transport_kunmap_data_sg(struct se_cmd *cmd)
2250 {
2251         if (!cmd->t_data_nents) {
2252                 return;
2253         } else if (cmd->t_data_nents == 1) {
2254                 kunmap(sg_page(cmd->t_data_sg));
2255                 return;
2256         }
2257
2258         vunmap(cmd->t_data_vmap);
2259         cmd->t_data_vmap = NULL;
2260 }
2261 EXPORT_SYMBOL(transport_kunmap_data_sg);
2262
2263 static int
2264 transport_generic_get_mem(struct se_cmd *cmd)
2265 {
2266         u32 length = cmd->data_length;
2267         unsigned int nents;
2268         struct page *page;
2269         gfp_t zero_flag;
2270         int i = 0;
2271
2272         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2273         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2274         if (!cmd->t_data_sg)
2275                 return -ENOMEM;
2276
2277         cmd->t_data_nents = nents;
2278         sg_init_table(cmd->t_data_sg, nents);
2279
2280         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2281
2282         while (length) {
2283                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2284                 page = alloc_page(GFP_KERNEL | zero_flag);
2285                 if (!page)
2286                         goto out;
2287
2288                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2289                 length -= page_len;
2290                 i++;
2291         }
2292         return 0;
2293
2294 out:
2295         while (i > 0) {
2296                 i--;
2297                 __free_page(sg_page(&cmd->t_data_sg[i]));
2298         }
2299         kfree(cmd->t_data_sg);
2300         cmd->t_data_sg = NULL;
2301         return -ENOMEM;
2302 }
2303
2304 /*
2305  * Allocate any required resources to execute the command.  For writes we
2306  * might not have the payload yet, so notify the fabric via a call to
2307  * ->write_pending instead. Otherwise place it on the execution queue.
2308  */
2309 int transport_generic_new_cmd(struct se_cmd *cmd)
2310 {
2311         int ret = 0;
2312
2313         /*
2314          * Determine is the TCM fabric module has already allocated physical
2315          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2316          * beforehand.
2317          */
2318         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2319             cmd->data_length) {
2320                 ret = transport_generic_get_mem(cmd);
2321                 if (ret < 0)
2322                         goto out_fail;
2323         }
2324         /*
2325          * If this command doesn't have any payload and we don't have to call
2326          * into the fabric for data transfers, go ahead and complete it right
2327          * away.
2328          */
2329         if (!cmd->data_length) {
2330                 spin_lock_irq(&cmd->t_state_lock);
2331                 cmd->t_state = TRANSPORT_COMPLETE;
2332                 cmd->transport_state |= CMD_T_ACTIVE;
2333                 spin_unlock_irq(&cmd->t_state_lock);
2334
2335                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2336                         u8 ua_asc = 0, ua_ascq = 0;
2337
2338                         core_scsi3_ua_clear_for_request_sense(cmd,
2339                                         &ua_asc, &ua_ascq);
2340                 }
2341
2342                 INIT_WORK(&cmd->work, target_complete_ok_work);
2343                 queue_work(target_completion_wq, &cmd->work);
2344                 return 0;
2345         }
2346
2347         atomic_inc(&cmd->t_fe_count);
2348
2349         /*
2350          * If this command is not a write we can execute it right here,
2351          * for write buffers we need to notify the fabric driver first
2352          * and let it call back once the write buffers are ready.
2353          */
2354         target_add_to_state_list(cmd);
2355         if (cmd->data_direction != DMA_TO_DEVICE) {
2356                 target_execute_cmd(cmd);
2357                 return 0;
2358         }
2359
2360         spin_lock_irq(&cmd->t_state_lock);
2361         cmd->t_state = TRANSPORT_WRITE_PENDING;
2362         spin_unlock_irq(&cmd->t_state_lock);
2363
2364         transport_cmd_check_stop(cmd, false);
2365
2366         ret = cmd->se_tfo->write_pending(cmd);
2367         if (ret == -EAGAIN || ret == -ENOMEM)
2368                 goto queue_full;
2369
2370         if (ret < 0)
2371                 return ret;
2372         return 1;
2373
2374 out_fail:
2375         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2376         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2377         return -EINVAL;
2378 queue_full:
2379         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2380         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2381         transport_handle_queue_full(cmd, cmd->se_dev);
2382         return 0;
2383 }
2384 EXPORT_SYMBOL(transport_generic_new_cmd);
2385
2386 static void transport_write_pending_qf(struct se_cmd *cmd)
2387 {
2388         int ret;
2389
2390         ret = cmd->se_tfo->write_pending(cmd);
2391         if (ret == -EAGAIN || ret == -ENOMEM) {
2392                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2393                          cmd);
2394                 transport_handle_queue_full(cmd, cmd->se_dev);
2395         }
2396 }
2397
2398 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2399 {
2400         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2401                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2402                          transport_wait_for_tasks(cmd);
2403
2404                 transport_release_cmd(cmd);
2405         } else {
2406                 if (wait_for_tasks)
2407                         transport_wait_for_tasks(cmd);
2408
2409                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2410
2411                 if (cmd->se_lun)
2412                         transport_lun_remove_cmd(cmd);
2413
2414                 transport_put_cmd(cmd);
2415         }
2416 }
2417 EXPORT_SYMBOL(transport_generic_free_cmd);
2418
2419 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2420  * @se_sess:    session to reference
2421  * @se_cmd:     command descriptor to add
2422  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2423  */
2424 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2425                                bool ack_kref)
2426 {
2427         unsigned long flags;
2428         int ret = 0;
2429
2430         kref_init(&se_cmd->cmd_kref);
2431         /*
2432          * Add a second kref if the fabric caller is expecting to handle
2433          * fabric acknowledgement that requires two target_put_sess_cmd()
2434          * invocations before se_cmd descriptor release.
2435          */
2436         if (ack_kref == true) {
2437                 kref_get(&se_cmd->cmd_kref);
2438                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2439         }
2440
2441         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2442         if (se_sess->sess_tearing_down) {
2443                 ret = -ESHUTDOWN;
2444                 goto out;
2445         }
2446         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2447         se_cmd->check_release = 1;
2448
2449 out:
2450         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2451         return ret;
2452 }
2453
2454 static void target_release_cmd_kref(struct kref *kref)
2455 {
2456         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2457         struct se_session *se_sess = se_cmd->se_sess;
2458         unsigned long flags;
2459
2460         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2461         if (list_empty(&se_cmd->se_cmd_list)) {
2462                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2463                 se_cmd->se_tfo->release_cmd(se_cmd);
2464                 return;
2465         }
2466         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2467                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2468                 complete(&se_cmd->cmd_wait_comp);
2469                 return;
2470         }
2471         list_del(&se_cmd->se_cmd_list);
2472         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473
2474         se_cmd->se_tfo->release_cmd(se_cmd);
2475 }
2476
2477 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2478  * @se_sess:    session to reference
2479  * @se_cmd:     command descriptor to drop
2480  */
2481 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2482 {
2483         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2484 }
2485 EXPORT_SYMBOL(target_put_sess_cmd);
2486
2487 /* target_sess_cmd_list_set_waiting - Flag all commands in
2488  *         sess_cmd_list to complete cmd_wait_comp.  Set
2489  *         sess_tearing_down so no more commands are queued.
2490  * @se_sess:    session to flag
2491  */
2492 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2493 {
2494         struct se_cmd *se_cmd;
2495         unsigned long flags;
2496
2497         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2498
2499         WARN_ON(se_sess->sess_tearing_down);
2500         se_sess->sess_tearing_down = 1;
2501
2502         list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2503                 se_cmd->cmd_wait_set = 1;
2504
2505         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2506 }
2507 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2508
2509 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2510  * @se_sess:    session to wait for active I/O
2511  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2512  */
2513 void target_wait_for_sess_cmds(
2514         struct se_session *se_sess,
2515         int wait_for_tasks)
2516 {
2517         struct se_cmd *se_cmd, *tmp_cmd;
2518         bool rc = false;
2519
2520         list_for_each_entry_safe(se_cmd, tmp_cmd,
2521                                 &se_sess->sess_cmd_list, se_cmd_list) {
2522                 list_del(&se_cmd->se_cmd_list);
2523
2524                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2525                         " %d\n", se_cmd, se_cmd->t_state,
2526                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2527
2528                 if (wait_for_tasks) {
2529                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2530                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2531                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2532
2533                         rc = transport_wait_for_tasks(se_cmd);
2534
2535                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2536                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2537                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2538                 }
2539
2540                 if (!rc) {
2541                         wait_for_completion(&se_cmd->cmd_wait_comp);
2542                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2543                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2544                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2545                 }
2546
2547                 se_cmd->se_tfo->release_cmd(se_cmd);
2548         }
2549 }
2550 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2551
2552 /*      transport_lun_wait_for_tasks():
2553  *
2554  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2555  *      an struct se_lun to be successfully shutdown.
2556  */
2557 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2558 {
2559         unsigned long flags;
2560         int ret = 0;
2561
2562         /*
2563          * If the frontend has already requested this struct se_cmd to
2564          * be stopped, we can safely ignore this struct se_cmd.
2565          */
2566         spin_lock_irqsave(&cmd->t_state_lock, flags);
2567         if (cmd->transport_state & CMD_T_STOP) {
2568                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2569
2570                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2571                          cmd->se_tfo->get_task_tag(cmd));
2572                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2573                 transport_cmd_check_stop(cmd, false);
2574                 return -EPERM;
2575         }
2576         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2577         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2578
2579         // XXX: audit task_flags checks.
2580         spin_lock_irqsave(&cmd->t_state_lock, flags);
2581         if ((cmd->transport_state & CMD_T_BUSY) &&
2582             (cmd->transport_state & CMD_T_SENT)) {
2583                 if (!target_stop_cmd(cmd, &flags))
2584                         ret++;
2585         }
2586         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2587
2588         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2589                         " %d\n", cmd, ret);
2590         if (!ret) {
2591                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2592                                 cmd->se_tfo->get_task_tag(cmd));
2593                 wait_for_completion(&cmd->transport_lun_stop_comp);
2594                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2595                                 cmd->se_tfo->get_task_tag(cmd));
2596         }
2597
2598         return 0;
2599 }
2600
2601 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2602 {
2603         struct se_cmd *cmd = NULL;
2604         unsigned long lun_flags, cmd_flags;
2605         /*
2606          * Do exception processing and return CHECK_CONDITION status to the
2607          * Initiator Port.
2608          */
2609         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2610         while (!list_empty(&lun->lun_cmd_list)) {
2611                 cmd = list_first_entry(&lun->lun_cmd_list,
2612                        struct se_cmd, se_lun_node);
2613                 list_del_init(&cmd->se_lun_node);
2614
2615                 spin_lock(&cmd->t_state_lock);
2616                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2617                         "_lun_stop for  ITT: 0x%08x\n",
2618                         cmd->se_lun->unpacked_lun,
2619                         cmd->se_tfo->get_task_tag(cmd));
2620                 cmd->transport_state |= CMD_T_LUN_STOP;
2621                 spin_unlock(&cmd->t_state_lock);
2622
2623                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2624
2625                 if (!cmd->se_lun) {
2626                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2627                                 cmd->se_tfo->get_task_tag(cmd),
2628                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2629                         BUG();
2630                 }
2631                 /*
2632                  * If the Storage engine still owns the iscsi_cmd_t, determine
2633                  * and/or stop its context.
2634                  */
2635                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2636                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2637                         cmd->se_tfo->get_task_tag(cmd));
2638
2639                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2640                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2641                         continue;
2642                 }
2643
2644                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2645                         "_wait_for_tasks(): SUCCESS\n",
2646                         cmd->se_lun->unpacked_lun,
2647                         cmd->se_tfo->get_task_tag(cmd));
2648
2649                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2650                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2651                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2652                         goto check_cond;
2653                 }
2654                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2655                 target_remove_from_state_list(cmd);
2656                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2657
2658                 /*
2659                  * The Storage engine stopped this struct se_cmd before it was
2660                  * send to the fabric frontend for delivery back to the
2661                  * Initiator Node.  Return this SCSI CDB back with an
2662                  * CHECK_CONDITION status.
2663                  */
2664 check_cond:
2665                 transport_send_check_condition_and_sense(cmd,
2666                                 TCM_NON_EXISTENT_LUN, 0);
2667                 /*
2668                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
2669                  * be released, notify the waiting thread now that LU has
2670                  * finished accessing it.
2671                  */
2672                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2673                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2674                         pr_debug("SE_LUN[%d] - Detected FE stop for"
2675                                 " struct se_cmd: %p ITT: 0x%08x\n",
2676                                 lun->unpacked_lun,
2677                                 cmd, cmd->se_tfo->get_task_tag(cmd));
2678
2679                         spin_unlock_irqrestore(&cmd->t_state_lock,
2680                                         cmd_flags);
2681                         transport_cmd_check_stop(cmd, false);
2682                         complete(&cmd->transport_lun_fe_stop_comp);
2683                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2684                         continue;
2685                 }
2686                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2687                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2688
2689                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2690                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2691         }
2692         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2693 }
2694
2695 static int transport_clear_lun_thread(void *p)
2696 {
2697         struct se_lun *lun = p;
2698
2699         __transport_clear_lun_from_sessions(lun);
2700         complete(&lun->lun_shutdown_comp);
2701
2702         return 0;
2703 }
2704
2705 int transport_clear_lun_from_sessions(struct se_lun *lun)
2706 {
2707         struct task_struct *kt;
2708
2709         kt = kthread_run(transport_clear_lun_thread, lun,
2710                         "tcm_cl_%u", lun->unpacked_lun);
2711         if (IS_ERR(kt)) {
2712                 pr_err("Unable to start clear_lun thread\n");
2713                 return PTR_ERR(kt);
2714         }
2715         wait_for_completion(&lun->lun_shutdown_comp);
2716
2717         return 0;
2718 }
2719
2720 /**
2721  * transport_wait_for_tasks - wait for completion to occur
2722  * @cmd:        command to wait
2723  *
2724  * Called from frontend fabric context to wait for storage engine
2725  * to pause and/or release frontend generated struct se_cmd.
2726  */
2727 bool transport_wait_for_tasks(struct se_cmd *cmd)
2728 {
2729         unsigned long flags;
2730
2731         spin_lock_irqsave(&cmd->t_state_lock, flags);
2732         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2733             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2734                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2735                 return false;
2736         }
2737
2738         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2739             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2740                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2741                 return false;
2742         }
2743         /*
2744          * If we are already stopped due to an external event (ie: LUN shutdown)
2745          * sleep until the connection can have the passed struct se_cmd back.
2746          * The cmd->transport_lun_stopped_sem will be upped by
2747          * transport_clear_lun_from_sessions() once the ConfigFS context caller
2748          * has completed its operation on the struct se_cmd.
2749          */
2750         if (cmd->transport_state & CMD_T_LUN_STOP) {
2751                 pr_debug("wait_for_tasks: Stopping"
2752                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2753                         "_stop_comp); for ITT: 0x%08x\n",
2754                         cmd->se_tfo->get_task_tag(cmd));
2755                 /*
2756                  * There is a special case for WRITES where a FE exception +
2757                  * LUN shutdown means ConfigFS context is still sleeping on
2758                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2759                  * We go ahead and up transport_lun_stop_comp just to be sure
2760                  * here.
2761                  */
2762                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2763                 complete(&cmd->transport_lun_stop_comp);
2764                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2765                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2766
2767                 target_remove_from_state_list(cmd);
2768                 /*
2769                  * At this point, the frontend who was the originator of this
2770                  * struct se_cmd, now owns the structure and can be released through
2771                  * normal means below.
2772                  */
2773                 pr_debug("wait_for_tasks: Stopped"
2774                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2775                         "stop_comp); for ITT: 0x%08x\n",
2776                         cmd->se_tfo->get_task_tag(cmd));
2777
2778                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2779         }
2780
2781         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2782                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2783                 return false;
2784         }
2785
2786         cmd->transport_state |= CMD_T_STOP;
2787
2788         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2789                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2790                 cmd, cmd->se_tfo->get_task_tag(cmd),
2791                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2792
2793         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2794
2795         wait_for_completion(&cmd->t_transport_stop_comp);
2796
2797         spin_lock_irqsave(&cmd->t_state_lock, flags);
2798         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2799
2800         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2801                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2802                 cmd->se_tfo->get_task_tag(cmd));
2803
2804         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2805
2806         return true;
2807 }
2808 EXPORT_SYMBOL(transport_wait_for_tasks);
2809
2810 static int transport_get_sense_codes(
2811         struct se_cmd *cmd,
2812         u8 *asc,
2813         u8 *ascq)
2814 {
2815         *asc = cmd->scsi_asc;
2816         *ascq = cmd->scsi_ascq;
2817
2818         return 0;
2819 }
2820
2821 static int transport_set_sense_codes(
2822         struct se_cmd *cmd,
2823         u8 asc,
2824         u8 ascq)
2825 {
2826         cmd->scsi_asc = asc;
2827         cmd->scsi_ascq = ascq;
2828
2829         return 0;
2830 }
2831
2832 int transport_send_check_condition_and_sense(
2833         struct se_cmd *cmd,
2834         u8 reason,
2835         int from_transport)
2836 {
2837         unsigned char *buffer = cmd->sense_buffer;
2838         unsigned long flags;
2839         int offset;
2840         u8 asc = 0, ascq = 0;
2841
2842         spin_lock_irqsave(&cmd->t_state_lock, flags);
2843         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2844                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2845                 return 0;
2846         }
2847         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2848         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2849
2850         if (!reason && from_transport)
2851                 goto after_reason;
2852
2853         if (!from_transport)
2854                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2855         /*
2856          * Data Segment and SenseLength of the fabric response PDU.
2857          *
2858          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2859          * from include/scsi/scsi_cmnd.h
2860          */
2861         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2862                                 TRANSPORT_SENSE_BUFFER);
2863         /*
2864          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2865          * SENSE KEY values from include/scsi/scsi.h
2866          */
2867         switch (reason) {
2868         case TCM_NON_EXISTENT_LUN:
2869                 /* CURRENT ERROR */
2870                 buffer[offset] = 0x70;
2871                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2872                 /* ILLEGAL REQUEST */
2873                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2874                 /* LOGICAL UNIT NOT SUPPORTED */
2875                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2876                 break;
2877         case TCM_UNSUPPORTED_SCSI_OPCODE:
2878         case TCM_SECTOR_COUNT_TOO_MANY:
2879                 /* CURRENT ERROR */
2880                 buffer[offset] = 0x70;
2881                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2882                 /* ILLEGAL REQUEST */
2883                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2884                 /* INVALID COMMAND OPERATION CODE */
2885                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2886                 break;
2887         case TCM_UNKNOWN_MODE_PAGE:
2888                 /* CURRENT ERROR */
2889                 buffer[offset] = 0x70;
2890                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2891                 /* ILLEGAL REQUEST */
2892                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2893                 /* INVALID FIELD IN CDB */
2894                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2895                 break;
2896         case TCM_CHECK_CONDITION_ABORT_CMD:
2897                 /* CURRENT ERROR */
2898                 buffer[offset] = 0x70;
2899                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2900                 /* ABORTED COMMAND */
2901                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2902                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2903                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2904                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2905                 break;
2906         case TCM_INCORRECT_AMOUNT_OF_DATA:
2907                 /* CURRENT ERROR */
2908                 buffer[offset] = 0x70;
2909                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2910                 /* ABORTED COMMAND */
2911                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2912                 /* WRITE ERROR */
2913                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2914                 /* NOT ENOUGH UNSOLICITED DATA */
2915                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2916                 break;
2917         case TCM_INVALID_CDB_FIELD:
2918                 /* CURRENT ERROR */
2919                 buffer[offset] = 0x70;
2920                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2921                 /* ILLEGAL REQUEST */
2922                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2923                 /* INVALID FIELD IN CDB */
2924                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2925                 break;
2926         case TCM_INVALID_PARAMETER_LIST:
2927                 /* CURRENT ERROR */
2928                 buffer[offset] = 0x70;
2929                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2930                 /* ILLEGAL REQUEST */
2931                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2932                 /* INVALID FIELD IN PARAMETER LIST */
2933                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2934                 break;
2935         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2936                 /* CURRENT ERROR */
2937                 buffer[offset] = 0x70;
2938                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2939                 /* ABORTED COMMAND */
2940                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2941                 /* WRITE ERROR */
2942                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2943                 /* UNEXPECTED_UNSOLICITED_DATA */
2944                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2945                 break;
2946         case TCM_SERVICE_CRC_ERROR:
2947                 /* CURRENT ERROR */
2948                 buffer[offset] = 0x70;
2949                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2950                 /* ABORTED COMMAND */
2951                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2952                 /* PROTOCOL SERVICE CRC ERROR */
2953                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2954                 /* N/A */
2955                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2956                 break;
2957         case TCM_SNACK_REJECTED:
2958                 /* CURRENT ERROR */
2959                 buffer[offset] = 0x70;
2960                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2961                 /* ABORTED COMMAND */
2962                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2963                 /* READ ERROR */
2964                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2965                 /* FAILED RETRANSMISSION REQUEST */
2966                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2967                 break;
2968         case TCM_WRITE_PROTECTED:
2969                 /* CURRENT ERROR */
2970                 buffer[offset] = 0x70;
2971                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2972                 /* DATA PROTECT */
2973                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2974                 /* WRITE PROTECTED */
2975                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2976                 break;
2977         case TCM_ADDRESS_OUT_OF_RANGE:
2978                 /* CURRENT ERROR */
2979                 buffer[offset] = 0x70;
2980                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2981                 /* ILLEGAL REQUEST */
2982                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2983                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2984                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2985                 break;
2986         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2987                 /* CURRENT ERROR */
2988                 buffer[offset] = 0x70;
2989                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2990                 /* UNIT ATTENTION */
2991                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2992                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2993                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2994                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2995                 break;
2996         case TCM_CHECK_CONDITION_NOT_READY:
2997                 /* CURRENT ERROR */
2998                 buffer[offset] = 0x70;
2999                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3000                 /* Not Ready */
3001                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3002                 transport_get_sense_codes(cmd, &asc, &ascq);
3003                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3004                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3005                 break;
3006         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3007         default:
3008                 /* CURRENT ERROR */
3009                 buffer[offset] = 0x70;
3010                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3011                 /* ILLEGAL REQUEST */
3012                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3013                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3014                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3015                 break;
3016         }
3017         /*
3018          * This code uses linux/include/scsi/scsi.h SAM status codes!
3019          */
3020         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3021         /*
3022          * Automatically padded, this value is encoded in the fabric's
3023          * data_length response PDU containing the SCSI defined sense data.
3024          */
3025         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
3026
3027 after_reason:
3028         return cmd->se_tfo->queue_status(cmd);
3029 }
3030 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3031
3032 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3033 {
3034         int ret = 0;
3035
3036         if (cmd->transport_state & CMD_T_ABORTED) {
3037                 if (!send_status ||
3038                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3039                         return 1;
3040
3041                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3042                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3043                         cmd->t_task_cdb[0],
3044                         cmd->se_tfo->get_task_tag(cmd));
3045
3046                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3047                 cmd->se_tfo->queue_status(cmd);
3048                 ret = 1;
3049         }
3050         return ret;
3051 }
3052 EXPORT_SYMBOL(transport_check_aborted_status);
3053
3054 void transport_send_task_abort(struct se_cmd *cmd)
3055 {
3056         unsigned long flags;
3057
3058         spin_lock_irqsave(&cmd->t_state_lock, flags);
3059         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3060                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3061                 return;
3062         }
3063         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3064
3065         /*
3066          * If there are still expected incoming fabric WRITEs, we wait
3067          * until until they have completed before sending a TASK_ABORTED
3068          * response.  This response with TASK_ABORTED status will be
3069          * queued back to fabric module by transport_check_aborted_status().
3070          */
3071         if (cmd->data_direction == DMA_TO_DEVICE) {
3072                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3073                         cmd->transport_state |= CMD_T_ABORTED;
3074                         smp_mb__after_atomic_inc();
3075                 }
3076         }
3077         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3078
3079         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3080                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3081                 cmd->se_tfo->get_task_tag(cmd));
3082
3083         cmd->se_tfo->queue_status(cmd);
3084 }
3085
3086 static void target_tmr_work(struct work_struct *work)
3087 {
3088         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3089         struct se_device *dev = cmd->se_dev;
3090         struct se_tmr_req *tmr = cmd->se_tmr_req;
3091         int ret;
3092
3093         switch (tmr->function) {
3094         case TMR_ABORT_TASK:
3095                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3096                 break;
3097         case TMR_ABORT_TASK_SET:
3098         case TMR_CLEAR_ACA:
3099         case TMR_CLEAR_TASK_SET:
3100                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3101                 break;
3102         case TMR_LUN_RESET:
3103                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3104                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3105                                          TMR_FUNCTION_REJECTED;
3106                 break;
3107         case TMR_TARGET_WARM_RESET:
3108                 tmr->response = TMR_FUNCTION_REJECTED;
3109                 break;
3110         case TMR_TARGET_COLD_RESET:
3111                 tmr->response = TMR_FUNCTION_REJECTED;
3112                 break;
3113         default:
3114                 pr_err("Uknown TMR function: 0x%02x.\n",
3115                                 tmr->function);
3116                 tmr->response = TMR_FUNCTION_REJECTED;
3117                 break;
3118         }
3119
3120         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3121         cmd->se_tfo->queue_tm_rsp(cmd);
3122
3123         transport_cmd_check_stop_to_fabric(cmd);
3124 }
3125
3126 int transport_generic_handle_tmr(
3127         struct se_cmd *cmd)
3128 {
3129         INIT_WORK(&cmd->work, target_tmr_work);
3130         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3131         return 0;
3132 }
3133 EXPORT_SYMBOL(transport_generic_handle_tmr);