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 /*
 571  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
 572  */
 573 static int transport_get_sense_data(struct se_cmd *cmd)
 574 {
 575         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
 576         struct se_device *dev = cmd->se_dev;
 577         unsigned long flags;
 578         u32 offset = 0;
 579
 580         WARN_ON(!cmd->se_lun);
 581
 582         if (!dev)
 583                 return 0;
 584
 585         spin_lock_irqsave(&cmd->t_state_lock, flags);
 586         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
 587                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 588                 return 0;
 589         }
 590
 591         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
 592                 goto out;
 593
 594         if (!dev->transport->get_sense_buffer) {
 595                 pr_err("dev->transport->get_sense_buffer is NULL\n");
 596                 goto out;
 597         }
 598
 599         sense_buffer = dev->transport->get_sense_buffer(cmd);
 600         if (!sense_buffer) {
 601                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
 602                         " sense buffer for task with sense\n",
 603                         cmd->se_tfo->get_task_tag(cmd), cmd);
 604                 goto out;
 605         }
 606
 607         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 608
 609         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
 610
 611         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
 612
 613         /* Automatically padded */
 614         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
 615
 616         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
 617                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 618         return 0;
 619
 620 out:
 621         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 622         return -1;
 623 }
 624
 625 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 626 {
 627         struct se_device *dev = cmd->se_dev;
 628         int success = scsi_status == GOOD;
 629         unsigned long flags;
 630
 631         cmd->scsi_status = scsi_status;
 632
 633
 634         spin_lock_irqsave(&cmd->t_state_lock, flags);
 635         cmd->transport_state &= ~CMD_T_BUSY;
 636
 637         if (dev && dev->transport->transport_complete) {
 638                 if (dev->transport->transport_complete(cmd,
 639                                 cmd->t_data_sg) != 0) {
 640                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 641                         success = 1;
 642                 }
 643         }
 644
 645         /*
 646          * See if we are waiting to complete for an exception condition.
 647          */
 648         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 649                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 650                 complete(&cmd->task_stop_comp);
 651                 return;
 652         }
 653
 654         if (!success)
 655                 cmd->transport_state |= CMD_T_FAILED;
 656
 657         /*
 658          * Check for case where an explict ABORT_TASK has been received
 659          * and transport_wait_for_tasks() will be waiting for completion..
 660          */
 661         if (cmd->transport_state & CMD_T_ABORTED &&
 662             cmd->transport_state & CMD_T_STOP) {
 663                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 664                 complete(&cmd->t_transport_stop_comp);
 665                 return;
 666         } else if (cmd->transport_state & CMD_T_FAILED) {
 667                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 668                 INIT_WORK(&cmd->work, target_complete_failure_work);
 669         } else {
 670                 INIT_WORK(&cmd->work, target_complete_ok_work);
 671         }
 672
 673         cmd->t_state = TRANSPORT_COMPLETE;
 674         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 675         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 676
 677         queue_work(target_completion_wq, &cmd->work);
 678 }
 679 EXPORT_SYMBOL(target_complete_cmd);
 680
 681 static void target_add_to_state_list(struct se_cmd *cmd)
 682 {
 683         struct se_device *dev = cmd->se_dev;
 684         unsigned long flags;
 685
 686         spin_lock_irqsave(&dev->execute_task_lock, flags);
 687         if (!cmd->state_active) {
 688                 list_add_tail(&cmd->state_list, &dev->state_list);
 689                 cmd->state_active = true;
 690         }
 691         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 692 }
 693
 694 /*
 695  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 696  */
 697 static void transport_write_pending_qf(struct se_cmd *cmd);
 698 static void transport_complete_qf(struct se_cmd *cmd);
 699
 700 static void target_qf_do_work(struct work_struct *work)
 701 {
 702         struct se_device *dev = container_of(work, struct se_device,
 703                                         qf_work_queue);
 704         LIST_HEAD(qf_cmd_list);
 705         struct se_cmd *cmd, *cmd_tmp;
 706
 707         spin_lock_irq(&dev->qf_cmd_lock);
 708         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 709         spin_unlock_irq(&dev->qf_cmd_lock);
 710
 711         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 712                 list_del(&cmd->se_qf_node);
 713                 atomic_dec(&dev->dev_qf_count);
 714                 smp_mb__after_atomic_dec();
 715
 716                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 717                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 718                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 719                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 720                         : "UNKNOWN");
 721
 722                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 723                         transport_write_pending_qf(cmd);
 724                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 725                         transport_complete_qf(cmd);
 726         }
 727 }
 728
 729 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 730 {
 731         switch (cmd->data_direction) {
 732         case DMA_NONE:
 733                 return "NONE";
 734         case DMA_FROM_DEVICE:
 735                 return "READ";
 736         case DMA_TO_DEVICE:
 737                 return "WRITE";
 738         case DMA_BIDIRECTIONAL:
 739                 return "BIDI";
 740         default:
 741                 break;
 742         }
 743
 744         return "UNKNOWN";
 745 }
 746
 747 void transport_dump_dev_state(
 748         struct se_device *dev,
 749         char *b,
 750         int *bl)
 751 {
 752         *bl += sprintf(b + *bl, "Status: ");
 753         switch (dev->dev_status) {
 754         case TRANSPORT_DEVICE_ACTIVATED:
 755                 *bl += sprintf(b + *bl, "ACTIVATED");
 756                 break;
 757         case TRANSPORT_DEVICE_DEACTIVATED:
 758                 *bl += sprintf(b + *bl, "DEACTIVATED");
 759                 break;
 760         case TRANSPORT_DEVICE_SHUTDOWN:
 761                 *bl += sprintf(b + *bl, "SHUTDOWN");
 762                 break;
 763         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 764         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 765                 *bl += sprintf(b + *bl, "OFFLINE");
 766                 break;
 767         default:
 768                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 769                 break;
 770         }
 771
 772         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 773         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 774                 dev->se_sub_dev->se_dev_attrib.block_size,
 775                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 776         *bl += sprintf(b + *bl, "        ");
 777 }
 778
 779 void transport_dump_vpd_proto_id(
 780         struct t10_vpd *vpd,
 781         unsigned char *p_buf,
 782         int p_buf_len)
 783 {
 784         unsigned char buf[VPD_TMP_BUF_SIZE];
 785         int len;
 786
 787         memset(buf, 0, VPD_TMP_BUF_SIZE);
 788         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 789
 790         switch (vpd->protocol_identifier) {
 791         case 0x00:
 792                 sprintf(buf+len, "Fibre Channel\n");
 793                 break;
 794         case 0x10:
 795                 sprintf(buf+len, "Parallel SCSI\n");
 796                 break;
 797         case 0x20:
 798                 sprintf(buf+len, "SSA\n");
 799                 break;
 800         case 0x30:
 801                 sprintf(buf+len, "IEEE 1394\n");
 802                 break;
 803         case 0x40:
 804                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 805                                 " Protocol\n");
 806                 break;
 807         case 0x50:
 808                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 809                 break;
 810         case 0x60:
 811                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 812                 break;
 813         case 0x70:
 814                 sprintf(buf+len, "Automation/Drive Interface Transport"
 815                                 " Protocol\n");
 816                 break;
 817         case 0x80:
 818                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 819                 break;
 820         default:
 821                 sprintf(buf+len, "Unknown 0x%02x\n",
 822                                 vpd->protocol_identifier);
 823                 break;
 824         }
 825
 826         if (p_buf)
 827                 strncpy(p_buf, buf, p_buf_len);
 828         else
 829                 pr_debug("%s", buf);
 830 }
 831
 832 void
 833 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 834 {
 835         /*
 836          * Check if the Protocol Identifier Valid (PIV) bit is set..
 837          *
 838          * from spc3r23.pdf section 7.5.1
 839          */
 840          if (page_83[1] & 0x80) {
 841                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 842                 vpd->protocol_identifier_set = 1;
 843                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 844         }
 845 }
 846 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 847
 848 int transport_dump_vpd_assoc(
 849         struct t10_vpd *vpd,
 850         unsigned char *p_buf,
 851         int p_buf_len)
 852 {
 853         unsigned char buf[VPD_TMP_BUF_SIZE];
 854         int ret = 0;
 855         int len;
 856
 857         memset(buf, 0, VPD_TMP_BUF_SIZE);
 858         len = sprintf(buf, "T10 VPD Identifier Association: ");
 859
 860         switch (vpd->association) {
 861         case 0x00:
 862                 sprintf(buf+len, "addressed logical unit\n");
 863                 break;
 864         case 0x10:
 865                 sprintf(buf+len, "target port\n");
 866                 break;
 867         case 0x20:
 868                 sprintf(buf+len, "SCSI target device\n");
 869                 break;
 870         default:
 871                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 872                 ret = -EINVAL;
 873                 break;
 874         }
 875
 876         if (p_buf)
 877                 strncpy(p_buf, buf, p_buf_len);
 878         else
 879                 pr_debug("%s", buf);
 880
 881         return ret;
 882 }
 883
 884 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 885 {
 886         /*
 887          * The VPD identification association..
 888          *
 889          * from spc3r23.pdf Section 7.6.3.1 Table 297
 890          */
 891         vpd->association = (page_83[1] & 0x30);
 892         return transport_dump_vpd_assoc(vpd, NULL, 0);
 893 }
 894 EXPORT_SYMBOL(transport_set_vpd_assoc);
 895
 896 int transport_dump_vpd_ident_type(
 897         struct t10_vpd *vpd,
 898         unsigned char *p_buf,
 899         int p_buf_len)
 900 {
 901         unsigned char buf[VPD_TMP_BUF_SIZE];
 902         int ret = 0;
 903         int len;
 904
 905         memset(buf, 0, VPD_TMP_BUF_SIZE);
 906         len = sprintf(buf, "T10 VPD Identifier Type: ");
 907
 908         switch (vpd->device_identifier_type) {
 909         case 0x00:
 910                 sprintf(buf+len, "Vendor specific\n");
 911                 break;
 912         case 0x01:
 913                 sprintf(buf+len, "T10 Vendor ID based\n");
 914                 break;
 915         case 0x02:
 916                 sprintf(buf+len, "EUI-64 based\n");
 917                 break;
 918         case 0x03:
 919                 sprintf(buf+len, "NAA\n");
 920                 break;
 921         case 0x04:
 922                 sprintf(buf+len, "Relative target port identifier\n");
 923                 break;
 924         case 0x08:
 925                 sprintf(buf+len, "SCSI name string\n");
 926                 break;
 927         default:
 928                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 929                                 vpd->device_identifier_type);
 930                 ret = -EINVAL;
 931                 break;
 932         }
 933
 934         if (p_buf) {
 935                 if (p_buf_len < strlen(buf)+1)
 936                         return -EINVAL;
 937                 strncpy(p_buf, buf, p_buf_len);
 938         } else {
 939                 pr_debug("%s", buf);
 940         }
 941
 942         return ret;
 943 }
 944
 945 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 946 {
 947         /*
 948          * The VPD identifier type..
 949          *
 950          * from spc3r23.pdf Section 7.6.3.1 Table 298
 951          */
 952         vpd->device_identifier_type = (page_83[1] & 0x0f);
 953         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 954 }
 955 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 956
 957 int transport_dump_vpd_ident(
 958         struct t10_vpd *vpd,
 959         unsigned char *p_buf,
 960         int p_buf_len)
 961 {
 962         unsigned char buf[VPD_TMP_BUF_SIZE];
 963         int ret = 0;
 964
 965         memset(buf, 0, VPD_TMP_BUF_SIZE);
 966
 967         switch (vpd->device_identifier_code_set) {
 968         case 0x01: /* Binary */
 969                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 970                         &vpd->device_identifier[0]);
 971                 break;
 972         case 0x02: /* ASCII */
 973                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 974                         &vpd->device_identifier[0]);
 975                 break;
 976         case 0x03: /* UTF-8 */
 977                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 978                         &vpd->device_identifier[0]);
 979                 break;
 980         default:
 981                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 982                         " 0x%02x", vpd->device_identifier_code_set);
 983                 ret = -EINVAL;
 984                 break;
 985         }
 986
 987         if (p_buf)
 988                 strncpy(p_buf, buf, p_buf_len);
 989         else
 990                 pr_debug("%s", buf);
 991
 992         return ret;
 993 }
 994
 995 int
 996 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 997 {
 998         static const char hex_str[] = "0123456789abcdef";
 999         int j = 0, i = 4; /* offset to start of the identifer */
1000
1001         /*
1002          * The VPD Code Set (encoding)
1003          *
1004          * from spc3r23.pdf Section 7.6.3.1 Table 296
1005          */
1006         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1007         switch (vpd->device_identifier_code_set) {
1008         case 0x01: /* Binary */
1009                 vpd->device_identifier[j++] =
1010                                 hex_str[vpd->device_identifier_type];
1011                 while (i < (4 + page_83[3])) {
1012                         vpd->device_identifier[j++] =
1013                                 hex_str[(page_83[i] & 0xf0) >> 4];
1014                         vpd->device_identifier[j++] =
1015                                 hex_str[page_83[i] & 0x0f];
1016                         i++;
1017                 }
1018                 break;
1019         case 0x02: /* ASCII */
1020         case 0x03: /* UTF-8 */
1021                 while (i < (4 + page_83[3]))
1022                         vpd->device_identifier[j++] = page_83[i++];
1023                 break;
1024         default:
1025                 break;
1026         }
1027
1028         return transport_dump_vpd_ident(vpd, NULL, 0);
1029 }
1030 EXPORT_SYMBOL(transport_set_vpd_ident);
1031
1032 static void core_setup_task_attr_emulation(struct se_device *dev)
1033 {
1034         /*
1035          * If this device is from Target_Core_Mod/pSCSI, disable the
1036          * SAM Task Attribute emulation.
1037          *
1038          * This is currently not available in upsream Linux/SCSI Target
1039          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1040          */
1041         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1042                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1043                 return;
1044         }
1045
1046         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1047         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1048                 " device\n", dev->transport->name,
1049                 dev->transport->get_device_rev(dev));
1050 }
1051
1052 static void scsi_dump_inquiry(struct se_device *dev)
1053 {
1054         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1055         char buf[17];
1056         int i, device_type;
1057         /*
1058          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1059          */
1060         for (i = 0; i < 8; i++)
1061                 if (wwn->vendor[i] >= 0x20)
1062                         buf[i] = wwn->vendor[i];
1063                 else
1064                         buf[i] = ' ';
1065         buf[i] = '\0';
1066         pr_debug("  Vendor: %s\n", buf);
1067
1068         for (i = 0; i < 16; i++)
1069                 if (wwn->model[i] >= 0x20)
1070                         buf[i] = wwn->model[i];
1071                 else
1072                         buf[i] = ' ';
1073         buf[i] = '\0';
1074         pr_debug("  Model: %s\n", buf);
1075
1076         for (i = 0; i < 4; i++)
1077                 if (wwn->revision[i] >= 0x20)
1078                         buf[i] = wwn->revision[i];
1079                 else
1080                         buf[i] = ' ';
1081         buf[i] = '\0';
1082         pr_debug("  Revision: %s\n", buf);
1083
1084         device_type = dev->transport->get_device_type(dev);
1085         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1086         pr_debug("                 ANSI SCSI revision: %02x\n",
1087                                 dev->transport->get_device_rev(dev));
1088 }
1089
1090 struct se_device *transport_add_device_to_core_hba(
1091         struct se_hba *hba,
1092         struct se_subsystem_api *transport,
1093         struct se_subsystem_dev *se_dev,
1094         u32 device_flags,
1095         void *transport_dev,
1096         struct se_dev_limits *dev_limits,
1097         const char *inquiry_prod,
1098         const char *inquiry_rev)
1099 {
1100         int force_pt;
1101         struct se_device  *dev;
1102
1103         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1104         if (!dev) {
1105                 pr_err("Unable to allocate memory for se_dev_t\n");
1106                 return NULL;
1107         }
1108
1109         dev->dev_flags          = device_flags;
1110         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1111         dev->dev_ptr            = transport_dev;
1112         dev->se_hba             = hba;
1113         dev->se_sub_dev         = se_dev;
1114         dev->transport          = transport;
1115         INIT_LIST_HEAD(&dev->dev_list);
1116         INIT_LIST_HEAD(&dev->dev_sep_list);
1117         INIT_LIST_HEAD(&dev->dev_tmr_list);
1118         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1119         INIT_LIST_HEAD(&dev->state_list);
1120         INIT_LIST_HEAD(&dev->qf_cmd_list);
1121         spin_lock_init(&dev->execute_task_lock);
1122         spin_lock_init(&dev->delayed_cmd_lock);
1123         spin_lock_init(&dev->dev_reservation_lock);
1124         spin_lock_init(&dev->dev_status_lock);
1125         spin_lock_init(&dev->se_port_lock);
1126         spin_lock_init(&dev->se_tmr_lock);
1127         spin_lock_init(&dev->qf_cmd_lock);
1128         atomic_set(&dev->dev_ordered_id, 0);
1129
1130         se_dev_set_default_attribs(dev, dev_limits);
1131
1132         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1133         dev->creation_time = get_jiffies_64();
1134         spin_lock_init(&dev->stats_lock);
1135
1136         spin_lock(&hba->device_lock);
1137         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1138         hba->dev_count++;
1139         spin_unlock(&hba->device_lock);
1140         /*
1141          * Setup the SAM Task Attribute emulation for struct se_device
1142          */
1143         core_setup_task_attr_emulation(dev);
1144         /*
1145          * Force PR and ALUA passthrough emulation with internal object use.
1146          */
1147         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1148         /*
1149          * Setup the Reservations infrastructure for struct se_device
1150          */
1151         core_setup_reservations(dev, force_pt);
1152         /*
1153          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1154          */
1155         if (core_setup_alua(dev, force_pt) < 0)
1156                 goto err_dev_list;
1157
1158         /*
1159          * Startup the struct se_device processing thread
1160          */
1161         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1162                                       dev->transport->name);
1163         if (!dev->tmr_wq) {
1164                 pr_err("Unable to create tmr workqueue for %s\n",
1165                         dev->transport->name);
1166                 goto err_dev_list;
1167         }
1168         /*
1169          * Setup work_queue for QUEUE_FULL
1170          */
1171         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1172         /*
1173          * Preload the initial INQUIRY const values if we are doing
1174          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1175          * passthrough because this is being provided by the backend LLD.
1176          * This is required so that transport_get_inquiry() copies these
1177          * originals once back into DEV_T10_WWN(dev) for the virtual device
1178          * setup.
1179          */
1180         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1181                 if (!inquiry_prod || !inquiry_rev) {
1182                         pr_err("All non TCM/pSCSI plugins require"
1183                                 " INQUIRY consts\n");
1184                         goto err_wq;
1185                 }
1186
1187                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1188                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1189                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1190         }
1191         scsi_dump_inquiry(dev);
1192
1193         return dev;
1194
1195 err_wq:
1196         destroy_workqueue(dev->tmr_wq);
1197 err_dev_list:
1198         spin_lock(&hba->device_lock);
1199         list_del(&dev->dev_list);
1200         hba->dev_count--;
1201         spin_unlock(&hba->device_lock);
1202
1203         se_release_vpd_for_dev(dev);
1204
1205         kfree(dev);
1206
1207         return NULL;
1208 }
1209 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1210
1211 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1212 {
1213         struct se_device *dev = cmd->se_dev;
1214
1215         if (cmd->unknown_data_length) {
1216                 cmd->data_length = size;
1217         } else if (size != cmd->data_length) {
1218                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1219                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1220                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1221                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1222
1223                 if (cmd->data_direction == DMA_TO_DEVICE) {
1224                         pr_err("Rejecting underflow/overflow"
1225                                         " WRITE data\n");
1226                         goto out_invalid_cdb_field;
1227                 }
1228                 /*
1229                  * Reject READ_* or WRITE_* with overflow/underflow for
1230                  * type SCF_SCSI_DATA_CDB.
1231                  */
1232                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1233                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1234                                 " CDB on non 512-byte sector setup subsystem"
1235                                 " plugin: %s\n", dev->transport->name);
1236                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1237                         goto out_invalid_cdb_field;
1238                 }
1239                 /*
1240                  * For the overflow case keep the existing fabric provided
1241                  * ->data_length.  Otherwise for the underflow case, reset
1242                  * ->data_length to the smaller SCSI expected data transfer
1243                  * length.
1244                  */
1245                 if (size > cmd->data_length) {
1246                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1247                         cmd->residual_count = (size - cmd->data_length);
1248                 } else {
1249                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1250                         cmd->residual_count = (cmd->data_length - size);
1251                         cmd->data_length = size;
1252                 }
1253         }
1254
1255         return 0;
1256
1257 out_invalid_cdb_field:
1258         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1259         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1260         return -EINVAL;
1261 }
1262
1263 /*
1264  * Used by fabric modules containing a local struct se_cmd within their
1265  * fabric dependent per I/O descriptor.
1266  */
1267 void transport_init_se_cmd(
1268         struct se_cmd *cmd,
1269         struct target_core_fabric_ops *tfo,
1270         struct se_session *se_sess,
1271         u32 data_length,
1272         int data_direction,
1273         int task_attr,
1274         unsigned char *sense_buffer)
1275 {
1276         INIT_LIST_HEAD(&cmd->se_lun_node);
1277         INIT_LIST_HEAD(&cmd->se_delayed_node);
1278         INIT_LIST_HEAD(&cmd->se_qf_node);
1279         INIT_LIST_HEAD(&cmd->se_cmd_list);
1280         INIT_LIST_HEAD(&cmd->state_list);
1281         init_completion(&cmd->transport_lun_fe_stop_comp);
1282         init_completion(&cmd->transport_lun_stop_comp);
1283         init_completion(&cmd->t_transport_stop_comp);
1284         init_completion(&cmd->cmd_wait_comp);
1285         init_completion(&cmd->task_stop_comp);
1286         spin_lock_init(&cmd->t_state_lock);
1287         cmd->transport_state = CMD_T_DEV_ACTIVE;
1288
1289         cmd->se_tfo = tfo;
1290         cmd->se_sess = se_sess;
1291         cmd->data_length = data_length;
1292         cmd->data_direction = data_direction;
1293         cmd->sam_task_attr = task_attr;
1294         cmd->sense_buffer = sense_buffer;
1295
1296         cmd->state_active = false;
1297 }
1298 EXPORT_SYMBOL(transport_init_se_cmd);
1299
1300 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1301 {
1302         /*
1303          * Check if SAM Task Attribute emulation is enabled for this
1304          * struct se_device storage object
1305          */
1306         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1307                 return 0;
1308
1309         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1310                 pr_debug("SAM Task Attribute ACA"
1311                         " emulation is not supported\n");
1312                 return -EINVAL;
1313         }
1314         /*
1315          * Used to determine when ORDERED commands should go from
1316          * Dormant to Active status.
1317          */
1318         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1319         smp_mb__after_atomic_inc();
1320         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1321                         cmd->se_ordered_id, cmd->sam_task_attr,
1322                         cmd->se_dev->transport->name);
1323         return 0;
1324 }
1325
1326 /*      target_setup_cmd_from_cdb():
1327  *
1328  *      Called from fabric RX Thread.
1329  */
1330 int target_setup_cmd_from_cdb(
1331         struct se_cmd *cmd,
1332         unsigned char *cdb)
1333 {
1334         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1335         u32 pr_reg_type = 0;
1336         u8 alua_ascq = 0;
1337         unsigned long flags;
1338         int ret;
1339
1340         /*
1341          * Ensure that the received CDB is less than the max (252 + 8) bytes
1342          * for VARIABLE_LENGTH_CMD
1343          */
1344         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1345                 pr_err("Received SCSI CDB with command_size: %d that"
1346                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1347                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1348                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1349                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1350                 return -EINVAL;
1351         }
1352         /*
1353          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1354          * allocate the additional extended CDB buffer now..  Otherwise
1355          * setup the pointer from __t_task_cdb to t_task_cdb.
1356          */
1357         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1358                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1359                                                 GFP_KERNEL);
1360                 if (!cmd->t_task_cdb) {
1361                         pr_err("Unable to allocate cmd->t_task_cdb"
1362                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1363                                 scsi_command_size(cdb),
1364                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1365                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1366                         cmd->scsi_sense_reason =
1367                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1368                         return -ENOMEM;
1369                 }
1370         } else
1371                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1372         /*
1373          * Copy the original CDB into cmd->
1374          */
1375         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1376
1377         /*
1378          * Check for an existing UNIT ATTENTION condition
1379          */
1380         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1381                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1382                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1383                 return -EINVAL;
1384         }
1385
1386         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1387         if (ret != 0) {
1388                 /*
1389                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1390                  * The ALUA additional sense code qualifier (ASCQ) is determined
1391                  * by the ALUA primary or secondary access state..
1392                  */
1393                 if (ret > 0) {
1394                         pr_debug("[%s]: ALUA TG Port not available, "
1395                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1396                                 "0x04/0x%02x\n",
1397                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1398
1399                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1400                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1401                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1402                         return -EINVAL;
1403                 }
1404                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1405                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1406                 return -EINVAL;
1407         }
1408
1409         /*
1410          * Check status for SPC-3 Persistent Reservations
1411          */
1412         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1413                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1414                                         cmd, cdb, pr_reg_type) != 0) {
1415                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1416                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1417                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1418                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1419                         return -EBUSY;
1420                 }
1421                 /*
1422                  * This means the CDB is allowed for the SCSI Initiator port
1423                  * when said port is *NOT* holding the legacy SPC-2 or
1424                  * SPC-3 Persistent Reservation.
1425                  */
1426         }
1427
1428         ret = cmd->se_dev->transport->parse_cdb(cmd);
1429         if (ret < 0)
1430                 return ret;
1431
1432         spin_lock_irqsave(&cmd->t_state_lock, flags);
1433         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1434         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1435
1436         /*
1437          * Check for SAM Task Attribute Emulation
1438          */
1439         if (transport_check_alloc_task_attr(cmd) < 0) {
1440                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1441                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1442                 return -EINVAL;
1443         }
1444         spin_lock(&cmd->se_lun->lun_sep_lock);
1445         if (cmd->se_lun->lun_sep)
1446                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1447         spin_unlock(&cmd->se_lun->lun_sep_lock);
1448         return 0;
1449 }
1450 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1451
1452 /*
1453  * Used by fabric module frontends to queue tasks directly.
1454  * Many only be used from process context only
1455  */
1456 int transport_handle_cdb_direct(
1457         struct se_cmd *cmd)
1458 {
1459         int ret;
1460
1461         if (!cmd->se_lun) {
1462                 dump_stack();
1463                 pr_err("cmd->se_lun is NULL\n");
1464                 return -EINVAL;
1465         }
1466         if (in_interrupt()) {
1467                 dump_stack();
1468                 pr_err("transport_generic_handle_cdb cannot be called"
1469                                 " from interrupt context\n");
1470                 return -EINVAL;
1471         }
1472         /*
1473          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1474          * outstanding descriptors are handled correctly during shutdown via
1475          * transport_wait_for_tasks()
1476          *
1477          * Also, we don't take cmd->t_state_lock here as we only expect
1478          * this to be called for initial descriptor submission.
1479          */
1480         cmd->t_state = TRANSPORT_NEW_CMD;
1481         cmd->transport_state |= CMD_T_ACTIVE;
1482
1483         /*
1484          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1485          * so follow TRANSPORT_NEW_CMD processing thread context usage
1486          * and call transport_generic_request_failure() if necessary..
1487          */
1488         ret = transport_generic_new_cmd(cmd);
1489         if (ret < 0)
1490                 transport_generic_request_failure(cmd);
1491
1492         return 0;
1493 }
1494 EXPORT_SYMBOL(transport_handle_cdb_direct);
1495
1496 /**
1497  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1498  *
1499  * @se_cmd: command descriptor to submit
1500  * @se_sess: associated se_sess for endpoint
1501  * @cdb: pointer to SCSI CDB
1502  * @sense: pointer to SCSI sense buffer
1503  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1504  * @data_length: fabric expected data transfer length
1505  * @task_addr: SAM task attribute
1506  * @data_dir: DMA data direction
1507  * @flags: flags for command submission from target_sc_flags_tables
1508  *
1509  * Returns non zero to signal active I/O shutdown failure.  All other
1510  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1511  * but still return zero here.
1512  *
1513  * This may only be called from process context, and also currently
1514  * assumes internal allocation of fabric payload buffer by target-core.
1515  **/
1516 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1517                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1518                 u32 data_length, int task_attr, int data_dir, int flags)
1519 {
1520         struct se_portal_group *se_tpg;
1521         int rc;
1522
1523         se_tpg = se_sess->se_tpg;
1524         BUG_ON(!se_tpg);
1525         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1526         BUG_ON(in_interrupt());
1527         /*
1528          * Initialize se_cmd for target operation.  From this point
1529          * exceptions are handled by sending exception status via
1530          * target_core_fabric_ops->queue_status() callback
1531          */
1532         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1533                                 data_length, data_dir, task_attr, sense);
1534         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1535                 se_cmd->unknown_data_length = 1;
1536         /*
1537          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1538          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1539          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1540          * kref_put() to happen during fabric packet acknowledgement.
1541          */
1542         rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1543         if (rc)
1544                 return rc;
1545         /*
1546          * Signal bidirectional data payloads to target-core
1547          */
1548         if (flags & TARGET_SCF_BIDI_OP)
1549                 se_cmd->se_cmd_flags |= SCF_BIDI;
1550         /*
1551          * Locate se_lun pointer and attach it to struct se_cmd
1552          */
1553         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1554                 transport_send_check_condition_and_sense(se_cmd,
1555                                 se_cmd->scsi_sense_reason, 0);
1556                 target_put_sess_cmd(se_sess, se_cmd);
1557                 return 0;
1558         }
1559
1560         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1561         if (rc != 0) {
1562                 transport_generic_request_failure(se_cmd);
1563                 return 0;
1564         }
1565
1566         /*
1567          * Check if we need to delay processing because of ALUA
1568          * Active/NonOptimized primary access state..
1569          */
1570         core_alua_check_nonop_delay(se_cmd);
1571
1572         transport_handle_cdb_direct(se_cmd);
1573         return 0;
1574 }
1575 EXPORT_SYMBOL(target_submit_cmd);
1576
1577 static void target_complete_tmr_failure(struct work_struct *work)
1578 {
1579         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1580
1581         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1582         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1583         transport_generic_free_cmd(se_cmd, 0);
1584 }
1585
1586 /**
1587  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1588  *                     for TMR CDBs
1589  *
1590  * @se_cmd: command descriptor to submit
1591  * @se_sess: associated se_sess for endpoint
1592  * @sense: pointer to SCSI sense buffer
1593  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1594  * @fabric_context: fabric context for TMR req
1595  * @tm_type: Type of TM request
1596  * @gfp: gfp type for caller
1597  * @tag: referenced task tag for TMR_ABORT_TASK
1598  * @flags: submit cmd flags
1599  *
1600  * Callable from all contexts.
1601  **/
1602
1603 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1604                 unsigned char *sense, u32 unpacked_lun,
1605                 void *fabric_tmr_ptr, unsigned char tm_type,
1606                 gfp_t gfp, unsigned int tag, int flags)
1607 {
1608         struct se_portal_group *se_tpg;
1609         int ret;
1610
1611         se_tpg = se_sess->se_tpg;
1612         BUG_ON(!se_tpg);
1613
1614         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1615                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1616         /*
1617          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1618          * allocation failure.
1619          */
1620         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1621         if (ret < 0)
1622                 return -ENOMEM;
1623
1624         if (tm_type == TMR_ABORT_TASK)
1625                 se_cmd->se_tmr_req->ref_task_tag = tag;
1626
1627         /* See target_submit_cmd for commentary */
1628         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1629         if (ret) {
1630                 core_tmr_release_req(se_cmd->se_tmr_req);
1631                 return ret;
1632         }
1633
1634         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1635         if (ret) {
1636                 /*
1637                  * For callback during failure handling, push this work off
1638                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1639                  */
1640                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1641                 schedule_work(&se_cmd->work);
1642                 return 0;
1643         }
1644         transport_generic_handle_tmr(se_cmd);
1645         return 0;
1646 }
1647 EXPORT_SYMBOL(target_submit_tmr);
1648
1649 /*
1650  * If the cmd is active, request it to be stopped and sleep until it
1651  * has completed.
1652  */
1653 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1654 {
1655         bool was_active = false;
1656
1657         if (cmd->transport_state & CMD_T_BUSY) {
1658                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1659                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1660
1661                 pr_debug("cmd %p waiting to complete\n", cmd);
1662                 wait_for_completion(&cmd->task_stop_comp);
1663                 pr_debug("cmd %p stopped successfully\n", cmd);
1664
1665                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1666                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1667                 cmd->transport_state &= ~CMD_T_BUSY;
1668                 was_active = true;
1669         }
1670
1671         return was_active;
1672 }
1673
1674 /*
1675  * Handle SAM-esque emulation for generic transport request failures.
1676  */
1677 void transport_generic_request_failure(struct se_cmd *cmd)
1678 {
1679         int ret = 0;
1680
1681         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1682                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1683                 cmd->t_task_cdb[0]);
1684         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1685                 cmd->se_tfo->get_cmd_state(cmd),
1686                 cmd->t_state, cmd->scsi_sense_reason);
1687         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1688                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1689                 (cmd->transport_state & CMD_T_STOP) != 0,
1690                 (cmd->transport_state & CMD_T_SENT) != 0);
1691
1692         /*
1693          * For SAM Task Attribute emulation for failed struct se_cmd
1694          */
1695         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1696                 transport_complete_task_attr(cmd);
1697
1698         switch (cmd->scsi_sense_reason) {
1699         case TCM_NON_EXISTENT_LUN:
1700         case TCM_UNSUPPORTED_SCSI_OPCODE:
1701         case TCM_INVALID_CDB_FIELD:
1702         case TCM_INVALID_PARAMETER_LIST:
1703         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1704         case TCM_UNKNOWN_MODE_PAGE:
1705         case TCM_WRITE_PROTECTED:
1706         case TCM_ADDRESS_OUT_OF_RANGE:
1707         case TCM_CHECK_CONDITION_ABORT_CMD:
1708         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1709         case TCM_CHECK_CONDITION_NOT_READY:
1710                 break;
1711         case TCM_RESERVATION_CONFLICT:
1712                 /*
1713                  * No SENSE Data payload for this case, set SCSI Status
1714                  * and queue the response to $FABRIC_MOD.
1715                  *
1716                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1717                  */
1718                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1719                 /*
1720                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1721                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1722                  * CONFLICT STATUS.
1723                  *
1724                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1725                  */
1726                 if (cmd->se_sess &&
1727                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1728                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1729                                 cmd->orig_fe_lun, 0x2C,
1730                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1731
1732                 ret = cmd->se_tfo->queue_status(cmd);
1733                 if (ret == -EAGAIN || ret == -ENOMEM)
1734                         goto queue_full;
1735                 goto check_stop;
1736         default:
1737                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1738                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1739                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1740                 break;
1741         }
1742
1743         ret = transport_send_check_condition_and_sense(cmd,
1744                         cmd->scsi_sense_reason, 0);
1745         if (ret == -EAGAIN || ret == -ENOMEM)
1746                 goto queue_full;
1747
1748 check_stop:
1749         transport_lun_remove_cmd(cmd);
1750         if (!transport_cmd_check_stop_to_fabric(cmd))
1751                 ;
1752         return;
1753
1754 queue_full:
1755         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1756         transport_handle_queue_full(cmd, cmd->se_dev);
1757 }
1758 EXPORT_SYMBOL(transport_generic_request_failure);
1759
1760 static void __target_execute_cmd(struct se_cmd *cmd)
1761 {
1762         int error = 0;
1763
1764         spin_lock_irq(&cmd->t_state_lock);
1765         cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1766         spin_unlock_irq(&cmd->t_state_lock);
1767
1768         if (cmd->execute_cmd)
1769                 error = cmd->execute_cmd(cmd);
1770
1771         if (error) {
1772                 spin_lock_irq(&cmd->t_state_lock);
1773                 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1774                 spin_unlock_irq(&cmd->t_state_lock);
1775
1776                 transport_generic_request_failure(cmd);
1777         }
1778 }
1779
1780 void target_execute_cmd(struct se_cmd *cmd)
1781 {
1782         struct se_device *dev = cmd->se_dev;
1783
1784         /*
1785          * If the received CDB has aleady been aborted stop processing it here.
1786          */
1787         if (transport_check_aborted_status(cmd, 1))
1788                 return;
1789
1790         /*
1791          * Determine if IOCTL context caller in requesting the stopping of this
1792          * command for LUN shutdown purposes.
1793          */
1794         spin_lock_irq(&cmd->t_state_lock);
1795         if (cmd->transport_state & CMD_T_LUN_STOP) {
1796                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1797                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1798
1799                 cmd->transport_state &= ~CMD_T_ACTIVE;
1800                 spin_unlock_irq(&cmd->t_state_lock);
1801                 complete(&cmd->transport_lun_stop_comp);
1802                 return;
1803         }
1804         /*
1805          * Determine if frontend context caller is requesting the stopping of
1806          * this command for frontend exceptions.
1807          */
1808         if (cmd->transport_state & CMD_T_STOP) {
1809                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1810                         __func__, __LINE__,
1811                         cmd->se_tfo->get_task_tag(cmd));
1812
1813                 spin_unlock_irq(&cmd->t_state_lock);
1814                 complete(&cmd->t_transport_stop_comp);
1815                 return;
1816         }
1817
1818         cmd->t_state = TRANSPORT_PROCESSING;
1819         spin_unlock_irq(&cmd->t_state_lock);
1820
1821         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1822                 goto execute;
1823
1824         /*
1825          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1826          * to allow the passed struct se_cmd list of tasks to the front of the list.
1827          */
1828         switch (cmd->sam_task_attr) {
1829         case MSG_HEAD_TAG:
1830                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1831                          "se_ordered_id: %u\n",
1832                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1833                 goto execute;
1834         case MSG_ORDERED_TAG:
1835                 atomic_inc(&dev->dev_ordered_sync);
1836                 smp_mb__after_atomic_inc();
1837
1838                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1839                          " se_ordered_id: %u\n",
1840                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1841
1842                 /*
1843                  * Execute an ORDERED command if no other older commands
1844                  * exist that need to be completed first.
1845                  */
1846                 if (!atomic_read(&dev->simple_cmds))
1847                         goto execute;
1848                 break;
1849         default:
1850                 /*
1851                  * For SIMPLE and UNTAGGED Task Attribute commands
1852                  */
1853                 atomic_inc(&dev->simple_cmds);
1854                 smp_mb__after_atomic_inc();
1855                 break;
1856         }
1857
1858         if (atomic_read(&dev->dev_ordered_sync) != 0) {
1859                 spin_lock(&dev->delayed_cmd_lock);
1860                 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1861                 spin_unlock(&dev->delayed_cmd_lock);
1862
1863                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1864                         " delayed CMD list, se_ordered_id: %u\n",
1865                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1866                         cmd->se_ordered_id);
1867                 return;
1868         }
1869
1870 execute:
1871         /*
1872          * Otherwise, no ORDERED task attributes exist..
1873          */
1874         __target_execute_cmd(cmd);
1875 }
1876 EXPORT_SYMBOL(target_execute_cmd);
1877
1878 /*
1879  * Process all commands up to the last received ORDERED task attribute which
1880  * requires another blocking boundary
1881  */
1882 static void target_restart_delayed_cmds(struct se_device *dev)
1883 {
1884         for (;;) {
1885                 struct se_cmd *cmd;
1886
1887                 spin_lock(&dev->delayed_cmd_lock);
1888                 if (list_empty(&dev->delayed_cmd_list)) {
1889                         spin_unlock(&dev->delayed_cmd_lock);
1890                         break;
1891                 }
1892
1893                 cmd = list_entry(dev->delayed_cmd_list.next,
1894                                  struct se_cmd, se_delayed_node);
1895                 list_del(&cmd->se_delayed_node);
1896                 spin_unlock(&dev->delayed_cmd_lock);
1897
1898                 __target_execute_cmd(cmd);
1899
1900                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1901                         break;
1902         }
1903 }
1904
1905 /*
1906  * Called from I/O completion to determine which dormant/delayed
1907  * and ordered cmds need to have their tasks added to the execution queue.
1908  */
1909 static void transport_complete_task_attr(struct se_cmd *cmd)
1910 {
1911         struct se_device *dev = cmd->se_dev;
1912
1913         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1914                 atomic_dec(&dev->simple_cmds);
1915                 smp_mb__after_atomic_dec();
1916                 dev->dev_cur_ordered_id++;
1917                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1918                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1919                         cmd->se_ordered_id);
1920         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1921                 dev->dev_cur_ordered_id++;
1922                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1923                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1924                         cmd->se_ordered_id);
1925         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1926                 atomic_dec(&dev->dev_ordered_sync);
1927                 smp_mb__after_atomic_dec();
1928
1929                 dev->dev_cur_ordered_id++;
1930                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1931                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1932         }
1933
1934         target_restart_delayed_cmds(dev);
1935 }
1936
1937 static void transport_complete_qf(struct se_cmd *cmd)
1938 {
1939         int ret = 0;
1940
1941         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1942                 transport_complete_task_attr(cmd);
1943
1944         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1945                 ret = cmd->se_tfo->queue_status(cmd);
1946                 if (ret)
1947                         goto out;
1948         }
1949
1950         switch (cmd->data_direction) {
1951         case DMA_FROM_DEVICE:
1952                 ret = cmd->se_tfo->queue_data_in(cmd);
1953                 break;
1954         case DMA_TO_DEVICE:
1955                 if (cmd->t_bidi_data_sg) {
1956                         ret = cmd->se_tfo->queue_data_in(cmd);
1957                         if (ret < 0)
1958                                 break;
1959                 }
1960                 /* Fall through for DMA_TO_DEVICE */
1961         case DMA_NONE:
1962                 ret = cmd->se_tfo->queue_status(cmd);
1963                 break;
1964         default:
1965                 break;
1966         }
1967
1968 out:
1969         if (ret < 0) {
1970                 transport_handle_queue_full(cmd, cmd->se_dev);
1971                 return;
1972         }
1973         transport_lun_remove_cmd(cmd);
1974         transport_cmd_check_stop_to_fabric(cmd);
1975 }
1976
1977 static void transport_handle_queue_full(
1978         struct se_cmd *cmd,
1979         struct se_device *dev)
1980 {
1981         spin_lock_irq(&dev->qf_cmd_lock);
1982         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1983         atomic_inc(&dev->dev_qf_count);
1984         smp_mb__after_atomic_inc();
1985         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1986
1987         schedule_work(&cmd->se_dev->qf_work_queue);
1988 }
1989
1990 static void target_complete_ok_work(struct work_struct *work)
1991 {
1992         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1993         int reason = 0, ret;
1994
1995         /*
1996          * Check if we need to move delayed/dormant tasks from cmds on the
1997          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1998          * Attribute.
1999          */
2000         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2001                 transport_complete_task_attr(cmd);
2002         /*
2003          * Check to schedule QUEUE_FULL work, or execute an existing
2004          * cmd->transport_qf_callback()
2005          */
2006         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2007                 schedule_work(&cmd->se_dev->qf_work_queue);
2008
2009         /*
2010          * Check if we need to retrieve a sense buffer from
2011          * the struct se_cmd in question.
2012          */
2013         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2014                 if (transport_get_sense_data(cmd) < 0)
2015                         reason = TCM_NON_EXISTENT_LUN;
2016
2017                 if (cmd->scsi_status) {
2018                         ret = transport_send_check_condition_and_sense(
2019                                         cmd, reason, 1);
2020                         if (ret == -EAGAIN || ret == -ENOMEM)
2021                                 goto queue_full;
2022
2023                         transport_lun_remove_cmd(cmd);
2024                         transport_cmd_check_stop_to_fabric(cmd);
2025                         return;
2026                 }
2027         }
2028         /*
2029          * Check for a callback, used by amongst other things
2030          * XDWRITE_READ_10 emulation.
2031          */
2032         if (cmd->transport_complete_callback)
2033                 cmd->transport_complete_callback(cmd);
2034
2035         switch (cmd->data_direction) {
2036         case DMA_FROM_DEVICE:
2037                 spin_lock(&cmd->se_lun->lun_sep_lock);
2038                 if (cmd->se_lun->lun_sep) {
2039                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2040                                         cmd->data_length;
2041                 }
2042                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2043
2044                 ret = cmd->se_tfo->queue_data_in(cmd);
2045                 if (ret == -EAGAIN || ret == -ENOMEM)
2046                         goto queue_full;
2047                 break;
2048         case DMA_TO_DEVICE:
2049                 spin_lock(&cmd->se_lun->lun_sep_lock);
2050                 if (cmd->se_lun->lun_sep) {
2051                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2052                                 cmd->data_length;
2053                 }
2054                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2055                 /*
2056                  * Check if we need to send READ payload for BIDI-COMMAND
2057                  */
2058                 if (cmd->t_bidi_data_sg) {
2059                         spin_lock(&cmd->se_lun->lun_sep_lock);
2060                         if (cmd->se_lun->lun_sep) {
2061                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2062                                         cmd->data_length;
2063                         }
2064                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2065                         ret = cmd->se_tfo->queue_data_in(cmd);
2066                         if (ret == -EAGAIN || ret == -ENOMEM)
2067                                 goto queue_full;
2068                         break;
2069                 }
2070                 /* Fall through for DMA_TO_DEVICE */
2071         case DMA_NONE:
2072                 ret = cmd->se_tfo->queue_status(cmd);
2073                 if (ret == -EAGAIN || ret == -ENOMEM)
2074                         goto queue_full;
2075                 break;
2076         default:
2077                 break;
2078         }
2079
2080         transport_lun_remove_cmd(cmd);
2081         transport_cmd_check_stop_to_fabric(cmd);
2082         return;
2083
2084 queue_full:
2085         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2086                 " data_direction: %d\n", cmd, cmd->data_direction);
2087         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2088         transport_handle_queue_full(cmd, cmd->se_dev);
2089 }
2090
2091 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2092 {
2093         struct scatterlist *sg;
2094         int count;
2095
2096         for_each_sg(sgl, sg, nents, count)
2097                 __free_page(sg_page(sg));
2098
2099         kfree(sgl);
2100 }
2101
2102 static inline void transport_free_pages(struct se_cmd *cmd)
2103 {
2104         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2105                 return;
2106
2107         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2108         cmd->t_data_sg = NULL;
2109         cmd->t_data_nents = 0;
2110
2111         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2112         cmd->t_bidi_data_sg = NULL;
2113         cmd->t_bidi_data_nents = 0;
2114 }
2115
2116 /**
2117  * transport_release_cmd - free a command
2118  * @cmd:       command to free
2119  *
2120  * This routine unconditionally frees a command, and reference counting
2121  * or list removal must be done in the caller.
2122  */
2123 static void transport_release_cmd(struct se_cmd *cmd)
2124 {
2125         BUG_ON(!cmd->se_tfo);
2126
2127         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2128                 core_tmr_release_req(cmd->se_tmr_req);
2129         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2130                 kfree(cmd->t_task_cdb);
2131         /*
2132          * If this cmd has been setup with target_get_sess_cmd(), drop
2133          * the kref and call ->release_cmd() in kref callback.
2134          */
2135          if (cmd->check_release != 0) {
2136                 target_put_sess_cmd(cmd->se_sess, cmd);
2137                 return;
2138         }
2139         cmd->se_tfo->release_cmd(cmd);
2140 }
2141
2142 /**
2143  * transport_put_cmd - release a reference to a command
2144  * @cmd:       command to release
2145  *
2146  * This routine releases our reference to the command and frees it if possible.
2147  */
2148 static void transport_put_cmd(struct se_cmd *cmd)
2149 {
2150         unsigned long flags;
2151
2152         spin_lock_irqsave(&cmd->t_state_lock, flags);
2153         if (atomic_read(&cmd->t_fe_count)) {
2154                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2155                         goto out_busy;
2156         }
2157
2158         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2159                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2160                 target_remove_from_state_list(cmd);
2161         }
2162         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2163
2164         transport_free_pages(cmd);
2165         transport_release_cmd(cmd);
2166         return;
2167 out_busy:
2168         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2169 }
2170
2171 /*
2172  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2173  * allocating in the core.
2174  * @cmd:  Associated se_cmd descriptor
2175  * @mem:  SGL style memory for TCM WRITE / READ
2176  * @sg_mem_num: Number of SGL elements
2177  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2178  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2179  *
2180  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2181  * of parameters.
2182  */
2183 int transport_generic_map_mem_to_cmd(
2184         struct se_cmd *cmd,
2185         struct scatterlist *sgl,
2186         u32 sgl_count,
2187         struct scatterlist *sgl_bidi,
2188         u32 sgl_bidi_count)
2189 {
2190         if (!sgl || !sgl_count)
2191                 return 0;
2192
2193         /*
2194          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2195          * scatterlists already have been set to follow what the fabric
2196          * passes for the original expected data transfer length.
2197          */
2198         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2199                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2200                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2201                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2202                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2203                 return -EINVAL;
2204         }
2205
2206         cmd->t_data_sg = sgl;
2207         cmd->t_data_nents = sgl_count;
2208
2209         if (sgl_bidi && sgl_bidi_count) {
2210                 cmd->t_bidi_data_sg = sgl_bidi;
2211                 cmd->t_bidi_data_nents = sgl_bidi_count;
2212         }
2213         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2214         return 0;
2215 }
2216 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2217
2218 void *transport_kmap_data_sg(struct se_cmd *cmd)
2219 {
2220         struct scatterlist *sg = cmd->t_data_sg;
2221         struct page **pages;
2222         int i;
2223
2224         BUG_ON(!sg);
2225         /*
2226          * We need to take into account a possible offset here for fabrics like
2227          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2228          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2229          */
2230         if (!cmd->t_data_nents)
2231                 return NULL;
2232         else if (cmd->t_data_nents == 1)
2233                 return kmap(sg_page(sg)) + sg->offset;
2234
2235         /* >1 page. use vmap */
2236         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2237         if (!pages)
2238                 return NULL;
2239
2240         /* convert sg[] to pages[] */
2241         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2242                 pages[i] = sg_page(sg);
2243         }
2244
2245         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2246         kfree(pages);
2247         if (!cmd->t_data_vmap)
2248                 return NULL;
2249
2250         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2251 }
2252 EXPORT_SYMBOL(transport_kmap_data_sg);
2253
2254 void transport_kunmap_data_sg(struct se_cmd *cmd)
2255 {
2256         if (!cmd->t_data_nents) {
2257                 return;
2258         } else if (cmd->t_data_nents == 1) {
2259                 kunmap(sg_page(cmd->t_data_sg));
2260                 return;
2261         }
2262
2263         vunmap(cmd->t_data_vmap);
2264         cmd->t_data_vmap = NULL;
2265 }
2266 EXPORT_SYMBOL(transport_kunmap_data_sg);
2267
2268 static int
2269 transport_generic_get_mem(struct se_cmd *cmd)
2270 {
2271         u32 length = cmd->data_length;
2272         unsigned int nents;
2273         struct page *page;
2274         gfp_t zero_flag;
2275         int i = 0;
2276
2277         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2278         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2279         if (!cmd->t_data_sg)
2280                 return -ENOMEM;
2281
2282         cmd->t_data_nents = nents;
2283         sg_init_table(cmd->t_data_sg, nents);
2284
2285         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2286
2287         while (length) {
2288                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2289                 page = alloc_page(GFP_KERNEL | zero_flag);
2290                 if (!page)
2291                         goto out;
2292
2293                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2294                 length -= page_len;
2295                 i++;
2296         }
2297         return 0;
2298
2299 out:
2300         while (i > 0) {
2301                 i--;
2302                 __free_page(sg_page(&cmd->t_data_sg[i]));
2303         }
2304         kfree(cmd->t_data_sg);
2305         cmd->t_data_sg = NULL;
2306         return -ENOMEM;
2307 }
2308
2309 /*
2310  * Allocate any required resources to execute the command.  For writes we
2311  * might not have the payload yet, so notify the fabric via a call to
2312  * ->write_pending instead. Otherwise place it on the execution queue.
2313  */
2314 int transport_generic_new_cmd(struct se_cmd *cmd)
2315 {
2316         int ret = 0;
2317
2318         /*
2319          * Determine is the TCM fabric module has already allocated physical
2320          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2321          * beforehand.
2322          */
2323         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2324             cmd->data_length) {
2325                 ret = transport_generic_get_mem(cmd);
2326                 if (ret < 0)
2327                         goto out_fail;
2328         }
2329         /*
2330          * If this command doesn't have any payload and we don't have to call
2331          * into the fabric for data transfers, go ahead and complete it right
2332          * away.
2333          */
2334         if (!cmd->data_length) {
2335                 spin_lock_irq(&cmd->t_state_lock);
2336                 cmd->t_state = TRANSPORT_COMPLETE;
2337                 cmd->transport_state |= CMD_T_ACTIVE;
2338                 spin_unlock_irq(&cmd->t_state_lock);
2339
2340                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2341                         u8 ua_asc = 0, ua_ascq = 0;
2342
2343                         core_scsi3_ua_clear_for_request_sense(cmd,
2344                                         &ua_asc, &ua_ascq);
2345                 }
2346
2347                 INIT_WORK(&cmd->work, target_complete_ok_work);
2348                 queue_work(target_completion_wq, &cmd->work);
2349                 return 0;
2350         }
2351
2352         atomic_inc(&cmd->t_fe_count);
2353
2354         /*
2355          * If this command is not a write we can execute it right here,
2356          * for write buffers we need to notify the fabric driver first
2357          * and let it call back once the write buffers are ready.
2358          */
2359         target_add_to_state_list(cmd);
2360         if (cmd->data_direction != DMA_TO_DEVICE) {
2361                 target_execute_cmd(cmd);
2362                 return 0;
2363         }
2364
2365         spin_lock_irq(&cmd->t_state_lock);
2366         cmd->t_state = TRANSPORT_WRITE_PENDING;
2367         spin_unlock_irq(&cmd->t_state_lock);
2368
2369         transport_cmd_check_stop(cmd, false);
2370
2371         ret = cmd->se_tfo->write_pending(cmd);
2372         if (ret == -EAGAIN || ret == -ENOMEM)
2373                 goto queue_full;
2374
2375         if (ret < 0)
2376                 return ret;
2377         return 1;
2378
2379 out_fail:
2380         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2381         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2382         return -EINVAL;
2383 queue_full:
2384         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2385         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2386         transport_handle_queue_full(cmd, cmd->se_dev);
2387         return 0;
2388 }
2389 EXPORT_SYMBOL(transport_generic_new_cmd);
2390
2391 static void transport_write_pending_qf(struct se_cmd *cmd)
2392 {
2393         int ret;
2394
2395         ret = cmd->se_tfo->write_pending(cmd);
2396         if (ret == -EAGAIN || ret == -ENOMEM) {
2397                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2398                          cmd);
2399                 transport_handle_queue_full(cmd, cmd->se_dev);
2400         }
2401 }
2402
2403 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2404 {
2405         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2406                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2407                          transport_wait_for_tasks(cmd);
2408
2409                 transport_release_cmd(cmd);
2410         } else {
2411                 if (wait_for_tasks)
2412                         transport_wait_for_tasks(cmd);
2413
2414                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2415
2416                 if (cmd->se_lun)
2417                         transport_lun_remove_cmd(cmd);
2418
2419                 transport_put_cmd(cmd);
2420         }
2421 }
2422 EXPORT_SYMBOL(transport_generic_free_cmd);
2423
2424 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2425  * @se_sess:    session to reference
2426  * @se_cmd:     command descriptor to add
2427  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2428  */
2429 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2430                                bool ack_kref)
2431 {
2432         unsigned long flags;
2433         int ret = 0;
2434
2435         kref_init(&se_cmd->cmd_kref);
2436         /*
2437          * Add a second kref if the fabric caller is expecting to handle
2438          * fabric acknowledgement that requires two target_put_sess_cmd()
2439          * invocations before se_cmd descriptor release.
2440          */
2441         if (ack_kref == true) {
2442                 kref_get(&se_cmd->cmd_kref);
2443                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2444         }
2445
2446         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2447         if (se_sess->sess_tearing_down) {
2448                 ret = -ESHUTDOWN;
2449                 goto out;
2450         }
2451         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2452         se_cmd->check_release = 1;
2453
2454 out:
2455         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2456         return ret;
2457 }
2458
2459 static void target_release_cmd_kref(struct kref *kref)
2460 {
2461         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2462         struct se_session *se_sess = se_cmd->se_sess;
2463         unsigned long flags;
2464
2465         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2466         if (list_empty(&se_cmd->se_cmd_list)) {
2467                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2468                 se_cmd->se_tfo->release_cmd(se_cmd);
2469                 return;
2470         }
2471         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2472                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473                 complete(&se_cmd->cmd_wait_comp);
2474                 return;
2475         }
2476         list_del(&se_cmd->se_cmd_list);
2477         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2478
2479         se_cmd->se_tfo->release_cmd(se_cmd);
2480 }
2481
2482 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2483  * @se_sess:    session to reference
2484  * @se_cmd:     command descriptor to drop
2485  */
2486 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2487 {
2488         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2489 }
2490 EXPORT_SYMBOL(target_put_sess_cmd);
2491
2492 /* target_sess_cmd_list_set_waiting - Flag all commands in
2493  *         sess_cmd_list to complete cmd_wait_comp.  Set
2494  *         sess_tearing_down so no more commands are queued.
2495  * @se_sess:    session to flag
2496  */
2497 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2498 {
2499         struct se_cmd *se_cmd;
2500         unsigned long flags;
2501
2502         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2503
2504         WARN_ON(se_sess->sess_tearing_down);
2505         se_sess->sess_tearing_down = 1;
2506
2507         list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2508                 se_cmd->cmd_wait_set = 1;
2509
2510         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2511 }
2512 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2513
2514 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2515  * @se_sess:    session to wait for active I/O
2516  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2517  */
2518 void target_wait_for_sess_cmds(
2519         struct se_session *se_sess,
2520         int wait_for_tasks)
2521 {
2522         struct se_cmd *se_cmd, *tmp_cmd;
2523         bool rc = false;
2524
2525         list_for_each_entry_safe(se_cmd, tmp_cmd,
2526                                 &se_sess->sess_cmd_list, se_cmd_list) {
2527                 list_del(&se_cmd->se_cmd_list);
2528
2529                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2530                         " %d\n", se_cmd, se_cmd->t_state,
2531                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2532
2533                 if (wait_for_tasks) {
2534                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2535                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2536                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2537
2538                         rc = transport_wait_for_tasks(se_cmd);
2539
2540                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2541                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2542                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2543                 }
2544
2545                 if (!rc) {
2546                         wait_for_completion(&se_cmd->cmd_wait_comp);
2547                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2548                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2549                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2550                 }
2551
2552                 se_cmd->se_tfo->release_cmd(se_cmd);
2553         }
2554 }
2555 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2556
2557 /*      transport_lun_wait_for_tasks():
2558  *
2559  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2560  *      an struct se_lun to be successfully shutdown.
2561  */
2562 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2563 {
2564         unsigned long flags;
2565         int ret = 0;
2566
2567         /*
2568          * If the frontend has already requested this struct se_cmd to
2569          * be stopped, we can safely ignore this struct se_cmd.
2570          */
2571         spin_lock_irqsave(&cmd->t_state_lock, flags);
2572         if (cmd->transport_state & CMD_T_STOP) {
2573                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2574
2575                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2576                          cmd->se_tfo->get_task_tag(cmd));
2577                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2578                 transport_cmd_check_stop(cmd, false);
2579                 return -EPERM;
2580         }
2581         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2582         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2583
2584         // XXX: audit task_flags checks.
2585         spin_lock_irqsave(&cmd->t_state_lock, flags);
2586         if ((cmd->transport_state & CMD_T_BUSY) &&
2587             (cmd->transport_state & CMD_T_SENT)) {
2588                 if (!target_stop_cmd(cmd, &flags))
2589                         ret++;
2590         }
2591         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2592
2593         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2594                         " %d\n", cmd, ret);
2595         if (!ret) {
2596                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2597                                 cmd->se_tfo->get_task_tag(cmd));
2598                 wait_for_completion(&cmd->transport_lun_stop_comp);
2599                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2600                                 cmd->se_tfo->get_task_tag(cmd));
2601         }
2602
2603         return 0;
2604 }
2605
2606 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2607 {
2608         struct se_cmd *cmd = NULL;
2609         unsigned long lun_flags, cmd_flags;
2610         /*
2611          * Do exception processing and return CHECK_CONDITION status to the
2612          * Initiator Port.
2613          */
2614         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2615         while (!list_empty(&lun->lun_cmd_list)) {
2616                 cmd = list_first_entry(&lun->lun_cmd_list,
2617                        struct se_cmd, se_lun_node);
2618                 list_del_init(&cmd->se_lun_node);
2619
2620                 spin_lock(&cmd->t_state_lock);
2621                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2622                         "_lun_stop for  ITT: 0x%08x\n",
2623                         cmd->se_lun->unpacked_lun,
2624                         cmd->se_tfo->get_task_tag(cmd));
2625                 cmd->transport_state |= CMD_T_LUN_STOP;
2626                 spin_unlock(&cmd->t_state_lock);
2627
2628                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2629
2630                 if (!cmd->se_lun) {
2631                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2632                                 cmd->se_tfo->get_task_tag(cmd),
2633                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2634                         BUG();
2635                 }
2636                 /*
2637                  * If the Storage engine still owns the iscsi_cmd_t, determine
2638                  * and/or stop its context.
2639                  */
2640                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2641                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2642                         cmd->se_tfo->get_task_tag(cmd));
2643
2644                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2645                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2646                         continue;
2647                 }
2648
2649                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2650                         "_wait_for_tasks(): SUCCESS\n",
2651                         cmd->se_lun->unpacked_lun,
2652                         cmd->se_tfo->get_task_tag(cmd));
2653
2654                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2655                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2656                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2657                         goto check_cond;
2658                 }
2659                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2660                 target_remove_from_state_list(cmd);
2661                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2662
2663                 /*
2664                  * The Storage engine stopped this struct se_cmd before it was
2665                  * send to the fabric frontend for delivery back to the
2666                  * Initiator Node.  Return this SCSI CDB back with an
2667                  * CHECK_CONDITION status.
2668                  */
2669 check_cond:
2670                 transport_send_check_condition_and_sense(cmd,
2671                                 TCM_NON_EXISTENT_LUN, 0);
2672                 /*
2673                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
2674                  * be released, notify the waiting thread now that LU has
2675                  * finished accessing it.
2676                  */
2677                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2678                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2679                         pr_debug("SE_LUN[%d] - Detected FE stop for"
2680                                 " struct se_cmd: %p ITT: 0x%08x\n",
2681                                 lun->unpacked_lun,
2682                                 cmd, cmd->se_tfo->get_task_tag(cmd));
2683
2684                         spin_unlock_irqrestore(&cmd->t_state_lock,
2685                                         cmd_flags);
2686                         transport_cmd_check_stop(cmd, false);
2687                         complete(&cmd->transport_lun_fe_stop_comp);
2688                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2689                         continue;
2690                 }
2691                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2692                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2693
2694                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2695                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2696         }
2697         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2698 }
2699
2700 static int transport_clear_lun_thread(void *p)
2701 {
2702         struct se_lun *lun = p;
2703
2704         __transport_clear_lun_from_sessions(lun);
2705         complete(&lun->lun_shutdown_comp);
2706
2707         return 0;
2708 }
2709
2710 int transport_clear_lun_from_sessions(struct se_lun *lun)
2711 {
2712         struct task_struct *kt;
2713
2714         kt = kthread_run(transport_clear_lun_thread, lun,
2715                         "tcm_cl_%u", lun->unpacked_lun);
2716         if (IS_ERR(kt)) {
2717                 pr_err("Unable to start clear_lun thread\n");
2718                 return PTR_ERR(kt);
2719         }
2720         wait_for_completion(&lun->lun_shutdown_comp);
2721
2722         return 0;
2723 }
2724
2725 /**
2726  * transport_wait_for_tasks - wait for completion to occur
2727  * @cmd:        command to wait
2728  *
2729  * Called from frontend fabric context to wait for storage engine
2730  * to pause and/or release frontend generated struct se_cmd.
2731  */
2732 bool transport_wait_for_tasks(struct se_cmd *cmd)
2733 {
2734         unsigned long flags;
2735
2736         spin_lock_irqsave(&cmd->t_state_lock, flags);
2737         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2738             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2739                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2740                 return false;
2741         }
2742
2743         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2744             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2745                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2746                 return false;
2747         }
2748         /*
2749          * If we are already stopped due to an external event (ie: LUN shutdown)
2750          * sleep until the connection can have the passed struct se_cmd back.
2751          * The cmd->transport_lun_stopped_sem will be upped by
2752          * transport_clear_lun_from_sessions() once the ConfigFS context caller
2753          * has completed its operation on the struct se_cmd.
2754          */
2755         if (cmd->transport_state & CMD_T_LUN_STOP) {
2756                 pr_debug("wait_for_tasks: Stopping"
2757                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2758                         "_stop_comp); for ITT: 0x%08x\n",
2759                         cmd->se_tfo->get_task_tag(cmd));
2760                 /*
2761                  * There is a special case for WRITES where a FE exception +
2762                  * LUN shutdown means ConfigFS context is still sleeping on
2763                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2764                  * We go ahead and up transport_lun_stop_comp just to be sure
2765                  * here.
2766                  */
2767                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2768                 complete(&cmd->transport_lun_stop_comp);
2769                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2770                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2771
2772                 target_remove_from_state_list(cmd);
2773                 /*
2774                  * At this point, the frontend who was the originator of this
2775                  * struct se_cmd, now owns the structure and can be released through
2776                  * normal means below.
2777                  */
2778                 pr_debug("wait_for_tasks: Stopped"
2779                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2780                         "stop_comp); for ITT: 0x%08x\n",
2781                         cmd->se_tfo->get_task_tag(cmd));
2782
2783                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2784         }
2785
2786         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2787                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2788                 return false;
2789         }
2790
2791         cmd->transport_state |= CMD_T_STOP;
2792
2793         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2794                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2795                 cmd, cmd->se_tfo->get_task_tag(cmd),
2796                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2797
2798         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2799
2800         wait_for_completion(&cmd->t_transport_stop_comp);
2801
2802         spin_lock_irqsave(&cmd->t_state_lock, flags);
2803         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2804
2805         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2806                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2807                 cmd->se_tfo->get_task_tag(cmd));
2808
2809         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2810
2811         return true;
2812 }
2813 EXPORT_SYMBOL(transport_wait_for_tasks);
2814
2815 static int transport_get_sense_codes(
2816         struct se_cmd *cmd,
2817         u8 *asc,
2818         u8 *ascq)
2819 {
2820         *asc = cmd->scsi_asc;
2821         *ascq = cmd->scsi_ascq;
2822
2823         return 0;
2824 }
2825
2826 static int transport_set_sense_codes(
2827         struct se_cmd *cmd,
2828         u8 asc,
2829         u8 ascq)
2830 {
2831         cmd->scsi_asc = asc;
2832         cmd->scsi_ascq = ascq;
2833
2834         return 0;
2835 }
2836
2837 int transport_send_check_condition_and_sense(
2838         struct se_cmd *cmd,
2839         u8 reason,
2840         int from_transport)
2841 {
2842         unsigned char *buffer = cmd->sense_buffer;
2843         unsigned long flags;
2844         int offset;
2845         u8 asc = 0, ascq = 0;
2846
2847         spin_lock_irqsave(&cmd->t_state_lock, flags);
2848         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2849                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2850                 return 0;
2851         }
2852         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2853         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2854
2855         if (!reason && from_transport)
2856                 goto after_reason;
2857
2858         if (!from_transport)
2859                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2860         /*
2861          * Data Segment and SenseLength of the fabric response PDU.
2862          *
2863          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2864          * from include/scsi/scsi_cmnd.h
2865          */
2866         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2867                                 TRANSPORT_SENSE_BUFFER);
2868         /*
2869          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2870          * SENSE KEY values from include/scsi/scsi.h
2871          */
2872         switch (reason) {
2873         case TCM_NON_EXISTENT_LUN:
2874                 /* CURRENT ERROR */
2875                 buffer[offset] = 0x70;
2876                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2877                 /* ILLEGAL REQUEST */
2878                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2879                 /* LOGICAL UNIT NOT SUPPORTED */
2880                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2881                 break;
2882         case TCM_UNSUPPORTED_SCSI_OPCODE:
2883         case TCM_SECTOR_COUNT_TOO_MANY:
2884                 /* CURRENT ERROR */
2885                 buffer[offset] = 0x70;
2886                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2887                 /* ILLEGAL REQUEST */
2888                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2889                 /* INVALID COMMAND OPERATION CODE */
2890                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2891                 break;
2892         case TCM_UNKNOWN_MODE_PAGE:
2893                 /* CURRENT ERROR */
2894                 buffer[offset] = 0x70;
2895                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2896                 /* ILLEGAL REQUEST */
2897                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2898                 /* INVALID FIELD IN CDB */
2899                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2900                 break;
2901         case TCM_CHECK_CONDITION_ABORT_CMD:
2902                 /* CURRENT ERROR */
2903                 buffer[offset] = 0x70;
2904                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2905                 /* ABORTED COMMAND */
2906                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2907                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2908                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2909                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2910                 break;
2911         case TCM_INCORRECT_AMOUNT_OF_DATA:
2912                 /* CURRENT ERROR */
2913                 buffer[offset] = 0x70;
2914                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2915                 /* ABORTED COMMAND */
2916                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2917                 /* WRITE ERROR */
2918                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2919                 /* NOT ENOUGH UNSOLICITED DATA */
2920                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2921                 break;
2922         case TCM_INVALID_CDB_FIELD:
2923                 /* CURRENT ERROR */
2924                 buffer[offset] = 0x70;
2925                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2926                 /* ILLEGAL REQUEST */
2927                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2928                 /* INVALID FIELD IN CDB */
2929                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2930                 break;
2931         case TCM_INVALID_PARAMETER_LIST:
2932                 /* CURRENT ERROR */
2933                 buffer[offset] = 0x70;
2934                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2935                 /* ILLEGAL REQUEST */
2936                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2937                 /* INVALID FIELD IN PARAMETER LIST */
2938                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2939                 break;
2940         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2941                 /* CURRENT ERROR */
2942                 buffer[offset] = 0x70;
2943                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2944                 /* ABORTED COMMAND */
2945                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2946                 /* WRITE ERROR */
2947                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2948                 /* UNEXPECTED_UNSOLICITED_DATA */
2949                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2950                 break;
2951         case TCM_SERVICE_CRC_ERROR:
2952                 /* CURRENT ERROR */
2953                 buffer[offset] = 0x70;
2954                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2955                 /* ABORTED COMMAND */
2956                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2957                 /* PROTOCOL SERVICE CRC ERROR */
2958                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2959                 /* N/A */
2960                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2961                 break;
2962         case TCM_SNACK_REJECTED:
2963                 /* CURRENT ERROR */
2964                 buffer[offset] = 0x70;
2965                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2966                 /* ABORTED COMMAND */
2967                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2968                 /* READ ERROR */
2969                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2970                 /* FAILED RETRANSMISSION REQUEST */
2971                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2972                 break;
2973         case TCM_WRITE_PROTECTED:
2974                 /* CURRENT ERROR */
2975                 buffer[offset] = 0x70;
2976                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2977                 /* DATA PROTECT */
2978                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2979                 /* WRITE PROTECTED */
2980                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2981                 break;
2982         case TCM_ADDRESS_OUT_OF_RANGE:
2983                 /* CURRENT ERROR */
2984                 buffer[offset] = 0x70;
2985                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2986                 /* ILLEGAL REQUEST */
2987                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2988                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2989                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2990                 break;
2991         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2992                 /* CURRENT ERROR */
2993                 buffer[offset] = 0x70;
2994                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2995                 /* UNIT ATTENTION */
2996                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2997                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2998                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2999                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3000                 break;
3001         case TCM_CHECK_CONDITION_NOT_READY:
3002                 /* CURRENT ERROR */
3003                 buffer[offset] = 0x70;
3004                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3005                 /* Not Ready */
3006                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3007                 transport_get_sense_codes(cmd, &asc, &ascq);
3008                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3009                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3010                 break;
3011         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3012         default:
3013                 /* CURRENT ERROR */
3014                 buffer[offset] = 0x70;
3015                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3016                 /* ILLEGAL REQUEST */
3017                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3018                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3019                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3020                 break;
3021         }
3022         /*
3023          * This code uses linux/include/scsi/scsi.h SAM status codes!
3024          */
3025         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3026         /*
3027          * Automatically padded, this value is encoded in the fabric's
3028          * data_length response PDU containing the SCSI defined sense data.
3029          */
3030         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
3031
3032 after_reason:
3033         return cmd->se_tfo->queue_status(cmd);
3034 }
3035 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3036
3037 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3038 {
3039         int ret = 0;
3040
3041         if (cmd->transport_state & CMD_T_ABORTED) {
3042                 if (!send_status ||
3043                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3044                         return 1;
3045
3046                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3047                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3048                         cmd->t_task_cdb[0],
3049                         cmd->se_tfo->get_task_tag(cmd));
3050
3051                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3052                 cmd->se_tfo->queue_status(cmd);
3053                 ret = 1;
3054         }
3055         return ret;
3056 }
3057 EXPORT_SYMBOL(transport_check_aborted_status);
3058
3059 void transport_send_task_abort(struct se_cmd *cmd)
3060 {
3061         unsigned long flags;
3062
3063         spin_lock_irqsave(&cmd->t_state_lock, flags);
3064         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3065                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3066                 return;
3067         }
3068         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3069
3070         /*
3071          * If there are still expected incoming fabric WRITEs, we wait
3072          * until until they have completed before sending a TASK_ABORTED
3073          * response.  This response with TASK_ABORTED status will be
3074          * queued back to fabric module by transport_check_aborted_status().
3075          */
3076         if (cmd->data_direction == DMA_TO_DEVICE) {
3077                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3078                         cmd->transport_state |= CMD_T_ABORTED;
3079                         smp_mb__after_atomic_inc();
3080                 }
3081         }
3082         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3083
3084         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3085                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3086                 cmd->se_tfo->get_task_tag(cmd));
3087
3088         cmd->se_tfo->queue_status(cmd);
3089 }
3090
3091 static void target_tmr_work(struct work_struct *work)
3092 {
3093         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3094         struct se_device *dev = cmd->se_dev;
3095         struct se_tmr_req *tmr = cmd->se_tmr_req;
3096         int ret;
3097
3098         switch (tmr->function) {
3099         case TMR_ABORT_TASK:
3100                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3101                 break;
3102         case TMR_ABORT_TASK_SET:
3103         case TMR_CLEAR_ACA:
3104         case TMR_CLEAR_TASK_SET:
3105                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3106                 break;
3107         case TMR_LUN_RESET:
3108                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3109                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3110                                          TMR_FUNCTION_REJECTED;
3111                 break;
3112         case TMR_TARGET_WARM_RESET:
3113                 tmr->response = TMR_FUNCTION_REJECTED;
3114                 break;
3115         case TMR_TARGET_COLD_RESET:
3116                 tmr->response = TMR_FUNCTION_REJECTED;
3117                 break;
3118         default:
3119                 pr_err("Uknown TMR function: 0x%02x.\n",
3120                                 tmr->function);
3121                 tmr->response = TMR_FUNCTION_REJECTED;
3122                 break;
3123         }
3124
3125         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3126         cmd->se_tfo->queue_tm_rsp(cmd);
3127
3128         transport_cmd_check_stop_to_fabric(cmd);
3129 }
3130
3131 int transport_generic_handle_tmr(
3132         struct se_cmd *cmd)
3133 {
3134         INIT_WORK(&cmd->work, target_tmr_work);
3135         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3136         return 0;
3137 }
3138 EXPORT_SYMBOL(transport_generic_handle_tmr);