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

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