drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <linux/ratelimit.h>
  41 #include <asm/unaligned.h>
  42 #include <net/sock.h>
  43 #include <net/tcp.h>
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50 #include <target/target_core_fabric.h>
  51 #include <target/target_core_configfs.h>
  52
  53 #include "target_core_internal.h"
  54 #include "target_core_alua.h"
  55 #include "target_core_pr.h"
  56 #include "target_core_ua.h"
  57
  58 static int sub_api_initialized;
  59
  60 static struct workqueue_struct *target_completion_wq;
  61 static struct kmem_cache *se_sess_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static void transport_complete_task_attr(struct se_cmd *cmd);
  70 static void transport_handle_queue_full(struct se_cmd *cmd,
  71                 struct se_device *dev);
  72 static int transport_generic_get_mem(struct se_cmd *cmd);
  73 static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
  74 static void transport_put_cmd(struct se_cmd *cmd);
  75 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  76 static void target_complete_ok_work(struct work_struct *work);
  77
  78 int init_se_kmem_caches(void)
  79 {
  80         se_sess_cache = kmem_cache_create("se_sess_cache",
  81                         sizeof(struct se_session), __alignof__(struct se_session),
  82                         0, NULL);
  83         if (!se_sess_cache) {
  84                 pr_err("kmem_cache_create() for struct se_session"
  85                                 " failed\n");
  86                 goto out;
  87         }
  88         se_ua_cache = kmem_cache_create("se_ua_cache",
  89                         sizeof(struct se_ua), __alignof__(struct se_ua),
  90                         0, NULL);
  91         if (!se_ua_cache) {
  92                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  93                 goto out_free_sess_cache;
  94         }
  95         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  96                         sizeof(struct t10_pr_registration),
  97                         __alignof__(struct t10_pr_registration), 0, NULL);
  98         if (!t10_pr_reg_cache) {
  99                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 100                                 " failed\n");
 101                 goto out_free_ua_cache;
 102         }
 103         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 104                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 105                         0, NULL);
 106         if (!t10_alua_lu_gp_cache) {
 107                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 108                                 " failed\n");
 109                 goto out_free_pr_reg_cache;
 110         }
 111         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 112                         sizeof(struct t10_alua_lu_gp_member),
 113                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 114         if (!t10_alua_lu_gp_mem_cache) {
 115                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 116                                 "cache failed\n");
 117                 goto out_free_lu_gp_cache;
 118         }
 119         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 120                         sizeof(struct t10_alua_tg_pt_gp),
 121                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 122         if (!t10_alua_tg_pt_gp_cache) {
 123                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 124                                 "cache failed\n");
 125                 goto out_free_lu_gp_mem_cache;
 126         }
 127         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 128                         "t10_alua_tg_pt_gp_mem_cache",
 129                         sizeof(struct t10_alua_tg_pt_gp_member),
 130                         __alignof__(struct t10_alua_tg_pt_gp_member),
 131                         0, NULL);
 132         if (!t10_alua_tg_pt_gp_mem_cache) {
 133                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 134                                 "mem_t failed\n");
 135                 goto out_free_tg_pt_gp_cache;
 136         }
 137
 138         target_completion_wq = alloc_workqueue("target_completion",
 139                                                WQ_MEM_RECLAIM, 0);
 140         if (!target_completion_wq)
 141                 goto out_free_tg_pt_gp_mem_cache;
 142
 143         return 0;
 144
 145 out_free_tg_pt_gp_mem_cache:
 146         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 147 out_free_tg_pt_gp_cache:
 148         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 149 out_free_lu_gp_mem_cache:
 150         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 151 out_free_lu_gp_cache:
 152         kmem_cache_destroy(t10_alua_lu_gp_cache);
 153 out_free_pr_reg_cache:
 154         kmem_cache_destroy(t10_pr_reg_cache);
 155 out_free_ua_cache:
 156         kmem_cache_destroy(se_ua_cache);
 157 out_free_sess_cache:
 158         kmem_cache_destroy(se_sess_cache);
 159 out:
 160         return -ENOMEM;
 161 }
 162
 163 void release_se_kmem_caches(void)
 164 {
 165         destroy_workqueue(target_completion_wq);
 166         kmem_cache_destroy(se_sess_cache);
 167         kmem_cache_destroy(se_ua_cache);
 168         kmem_cache_destroy(t10_pr_reg_cache);
 169         kmem_cache_destroy(t10_alua_lu_gp_cache);
 170         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 171         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 172         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 173 }
 174
 175 /* This code ensures unique mib indexes are handed out. */
 176 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 177 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 178
 179 /*
 180  * Allocate a new row index for the entry type specified
 181  */
 182 u32 scsi_get_new_index(scsi_index_t type)
 183 {
 184         u32 new_index;
 185
 186         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 187
 188         spin_lock(&scsi_mib_index_lock);
 189         new_index = ++scsi_mib_index[type];
 190         spin_unlock(&scsi_mib_index_lock);
 191
 192         return new_index;
 193 }
 194
 195 void transport_subsystem_check_init(void)
 196 {
 197         int ret;
 198
 199         if (sub_api_initialized)
 200                 return;
 201
 202         ret = request_module("target_core_iblock");
 203         if (ret != 0)
 204                 pr_err("Unable to load target_core_iblock\n");
 205
 206         ret = request_module("target_core_file");
 207         if (ret != 0)
 208                 pr_err("Unable to load target_core_file\n");
 209
 210         ret = request_module("target_core_pscsi");
 211         if (ret != 0)
 212                 pr_err("Unable to load target_core_pscsi\n");
 213
 214         ret = request_module("target_core_stgt");
 215         if (ret != 0)
 216                 pr_err("Unable to load target_core_stgt\n");
 217
 218         sub_api_initialized = 1;
 219         return;
 220 }
 221
 222 struct se_session *transport_init_session(void)
 223 {
 224         struct se_session *se_sess;
 225
 226         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 227         if (!se_sess) {
 228                 pr_err("Unable to allocate struct se_session from"
 229                                 " se_sess_cache\n");
 230                 return ERR_PTR(-ENOMEM);
 231         }
 232         INIT_LIST_HEAD(&se_sess->sess_list);
 233         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 234         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 235         spin_lock_init(&se_sess->sess_cmd_lock);
 236         kref_init(&se_sess->sess_kref);
 237
 238         return se_sess;
 239 }
 240 EXPORT_SYMBOL(transport_init_session);
 241
 242 /*
 243  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 244  */
 245 void __transport_register_session(
 246         struct se_portal_group *se_tpg,
 247         struct se_node_acl *se_nacl,
 248         struct se_session *se_sess,
 249         void *fabric_sess_ptr)
 250 {
 251         unsigned char buf[PR_REG_ISID_LEN];
 252
 253         se_sess->se_tpg = se_tpg;
 254         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 255         /*
 256          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 257          *
 258          * Only set for struct se_session's that will actually be moving I/O.
 259          * eg: *NOT* discovery sessions.
 260          */
 261         if (se_nacl) {
 262                 /*
 263                  * If the fabric module supports an ISID based TransportID,
 264                  * save this value in binary from the fabric I_T Nexus now.
 265                  */
 266                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 267                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 268                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 269                                         &buf[0], PR_REG_ISID_LEN);
 270                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 271                 }
 272                 kref_get(&se_nacl->acl_kref);
 273
 274                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 275                 /*
 276                  * The se_nacl->nacl_sess pointer will be set to the
 277                  * last active I_T Nexus for each struct se_node_acl.
 278                  */
 279                 se_nacl->nacl_sess = se_sess;
 280
 281                 list_add_tail(&se_sess->sess_acl_list,
 282                               &se_nacl->acl_sess_list);
 283                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 284         }
 285         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 286
 287         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 288                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 289 }
 290 EXPORT_SYMBOL(__transport_register_session);
 291
 292 void transport_register_session(
 293         struct se_portal_group *se_tpg,
 294         struct se_node_acl *se_nacl,
 295         struct se_session *se_sess,
 296         void *fabric_sess_ptr)
 297 {
 298         unsigned long flags;
 299
 300         spin_lock_irqsave(&se_tpg->session_lock, flags);
 301         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 302         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 303 }
 304 EXPORT_SYMBOL(transport_register_session);
 305
 306 void target_release_session(struct kref *kref)
 307 {
 308         struct se_session *se_sess = container_of(kref,
 309                         struct se_session, sess_kref);
 310         struct se_portal_group *se_tpg = se_sess->se_tpg;
 311
 312         se_tpg->se_tpg_tfo->close_session(se_sess);
 313 }
 314
 315 void target_get_session(struct se_session *se_sess)
 316 {
 317         kref_get(&se_sess->sess_kref);
 318 }
 319 EXPORT_SYMBOL(target_get_session);
 320
 321 void target_put_session(struct se_session *se_sess)
 322 {
 323         struct se_portal_group *tpg = se_sess->se_tpg;
 324
 325         if (tpg->se_tpg_tfo->put_session != NULL) {
 326                 tpg->se_tpg_tfo->put_session(se_sess);
 327                 return;
 328         }
 329         kref_put(&se_sess->sess_kref, target_release_session);
 330 }
 331 EXPORT_SYMBOL(target_put_session);
 332
 333 static void target_complete_nacl(struct kref *kref)
 334 {
 335         struct se_node_acl *nacl = container_of(kref,
 336                                 struct se_node_acl, acl_kref);
 337
 338         complete(&nacl->acl_free_comp);
 339 }
 340
 341 void target_put_nacl(struct se_node_acl *nacl)
 342 {
 343         kref_put(&nacl->acl_kref, target_complete_nacl);
 344 }
 345
 346 void transport_deregister_session_configfs(struct se_session *se_sess)
 347 {
 348         struct se_node_acl *se_nacl;
 349         unsigned long flags;
 350         /*
 351          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 352          */
 353         se_nacl = se_sess->se_node_acl;
 354         if (se_nacl) {
 355                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 356                 if (se_nacl->acl_stop == 0)
 357                         list_del(&se_sess->sess_acl_list);
 358                 /*
 359                  * If the session list is empty, then clear the pointer.
 360                  * Otherwise, set the struct se_session pointer from the tail
 361                  * element of the per struct se_node_acl active session list.
 362                  */
 363                 if (list_empty(&se_nacl->acl_sess_list))
 364                         se_nacl->nacl_sess = NULL;
 365                 else {
 366                         se_nacl->nacl_sess = container_of(
 367                                         se_nacl->acl_sess_list.prev,
 368                                         struct se_session, sess_acl_list);
 369                 }
 370                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 371         }
 372 }
 373 EXPORT_SYMBOL(transport_deregister_session_configfs);
 374
 375 void transport_free_session(struct se_session *se_sess)
 376 {
 377         kmem_cache_free(se_sess_cache, se_sess);
 378 }
 379 EXPORT_SYMBOL(transport_free_session);
 380
 381 void transport_deregister_session(struct se_session *se_sess)
 382 {
 383         struct se_portal_group *se_tpg = se_sess->se_tpg;
 384         struct target_core_fabric_ops *se_tfo;
 385         struct se_node_acl *se_nacl;
 386         unsigned long flags;
 387         bool comp_nacl = true;
 388
 389         if (!se_tpg) {
 390                 transport_free_session(se_sess);
 391                 return;
 392         }
 393         se_tfo = se_tpg->se_tpg_tfo;
 394
 395         spin_lock_irqsave(&se_tpg->session_lock, flags);
 396         list_del(&se_sess->sess_list);
 397         se_sess->se_tpg = NULL;
 398         se_sess->fabric_sess_ptr = NULL;
 399         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 400
 401         /*
 402          * Determine if we need to do extra work for this initiator node's
 403          * struct se_node_acl if it had been previously dynamically generated.
 404          */
 405         se_nacl = se_sess->se_node_acl;
 406
 407         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 408         if (se_nacl && se_nacl->dynamic_node_acl) {
 409                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 410                         list_del(&se_nacl->acl_list);
 411                         se_tpg->num_node_acls--;
 412                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 413                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 414                         core_free_device_list_for_node(se_nacl, se_tpg);
 415                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 416
 417                         comp_nacl = false;
 418                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 419                 }
 420         }
 421         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 422
 423         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 424                 se_tpg->se_tpg_tfo->get_fabric_name());
 425         /*
 426          * If last kref is dropping now for an explict NodeACL, awake sleeping
 427          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 428          * removal context.
 429          */
 430         if (se_nacl && comp_nacl == true)
 431                 target_put_nacl(se_nacl);
 432
 433         transport_free_session(se_sess);
 434 }
 435 EXPORT_SYMBOL(transport_deregister_session);
 436
 437 /*
 438  * Called with cmd->t_state_lock held.
 439  */
 440 static void target_remove_from_state_list(struct se_cmd *cmd)
 441 {
 442         struct se_device *dev = cmd->se_dev;
 443         unsigned long flags;
 444
 445         if (!dev)
 446                 return;
 447
 448         if (cmd->transport_state & CMD_T_BUSY)
 449                 return;
 450
 451         spin_lock_irqsave(&dev->execute_task_lock, flags);
 452         if (cmd->state_active) {
 453                 list_del(&cmd->state_list);
 454                 cmd->state_active = false;
 455         }
 456         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 457 }
 458
 459 static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 460 {
 461         unsigned long flags;
 462
 463         spin_lock_irqsave(&cmd->t_state_lock, flags);
 464         /*
 465          * Determine if IOCTL context caller in requesting the stopping of this
 466          * command for LUN shutdown purposes.
 467          */
 468         if (cmd->transport_state & CMD_T_LUN_STOP) {
 469                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 470                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 471
 472                 cmd->transport_state &= ~CMD_T_ACTIVE;
 473                 if (remove_from_lists)
 474                         target_remove_from_state_list(cmd);
 475                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 476
 477                 complete(&cmd->transport_lun_stop_comp);
 478                 return 1;
 479         }
 480
 481         if (remove_from_lists) {
 482                 target_remove_from_state_list(cmd);
 483
 484                 /*
 485                  * Clear struct se_cmd->se_lun before the handoff to FE.
 486                  */
 487                 cmd->se_lun = NULL;
 488         }
 489
 490         /*
 491          * Determine if frontend context caller is requesting the stopping of
 492          * this command for frontend exceptions.
 493          */
 494         if (cmd->transport_state & CMD_T_STOP) {
 495                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 496                         __func__, __LINE__,
 497                         cmd->se_tfo->get_task_tag(cmd));
 498
 499                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 500
 501                 complete(&cmd->t_transport_stop_comp);
 502                 return 1;
 503         }
 504
 505         cmd->transport_state &= ~CMD_T_ACTIVE;
 506         if (remove_from_lists) {
 507                 /*
 508                  * Some fabric modules like tcm_loop can release
 509                  * their internally allocated I/O reference now and
 510                  * struct se_cmd now.
 511                  *
 512                  * Fabric modules are expected to return '1' here if the
 513                  * se_cmd being passed is released at this point,
 514                  * or zero if not being released.
 515                  */
 516                 if (cmd->se_tfo->check_stop_free != NULL) {
 517                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 518                         return cmd->se_tfo->check_stop_free(cmd);
 519                 }
 520         }
 521
 522         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 523         return 0;
 524 }
 525
 526 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 527 {
 528         return transport_cmd_check_stop(cmd, true);
 529 }
 530
 531 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 532 {
 533         struct se_lun *lun = cmd->se_lun;
 534         unsigned long flags;
 535
 536         if (!lun)
 537                 return;
 538
 539         spin_lock_irqsave(&cmd->t_state_lock, flags);
 540         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 541                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 542                 target_remove_from_state_list(cmd);
 543         }
 544         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 545
 546         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 547         if (!list_empty(&cmd->se_lun_node))
 548                 list_del_init(&cmd->se_lun_node);
 549         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 550 }
 551
 552 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 553 {
 554         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 555                 transport_lun_remove_cmd(cmd);
 556
 557         if (transport_cmd_check_stop_to_fabric(cmd))
 558                 return;
 559         if (remove)
 560                 transport_put_cmd(cmd);
 561 }
 562
 563 static void target_complete_failure_work(struct work_struct *work)
 564 {
 565         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 566
 567         transport_generic_request_failure(cmd);
 568 }
 569
 570 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 571 {
 572         struct se_device *dev = cmd->se_dev;
 573         int success = scsi_status == GOOD;
 574         unsigned long flags;
 575
 576         cmd->scsi_status = scsi_status;
 577
 578
 579         spin_lock_irqsave(&cmd->t_state_lock, flags);
 580         cmd->transport_state &= ~CMD_T_BUSY;
 581
 582         if (dev && dev->transport->transport_complete) {
 583                 if (dev->transport->transport_complete(cmd,
 584                                 cmd->t_data_sg) != 0) {
 585                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 586                         success = 1;
 587                 }
 588         }
 589
 590         /*
 591          * See if we are waiting to complete for an exception condition.
 592          */
 593         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 594                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 595                 complete(&cmd->task_stop_comp);
 596                 return;
 597         }
 598
 599         if (!success)
 600                 cmd->transport_state |= CMD_T_FAILED;
 601
 602         /*
 603          * Check for case where an explict ABORT_TASK has been received
 604          * and transport_wait_for_tasks() will be waiting for completion..
 605          */
 606         if (cmd->transport_state & CMD_T_ABORTED &&
 607             cmd->transport_state & CMD_T_STOP) {
 608                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 609                 complete(&cmd->t_transport_stop_comp);
 610                 return;
 611         } else if (cmd->transport_state & CMD_T_FAILED) {
 612                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 613                 INIT_WORK(&cmd->work, target_complete_failure_work);
 614         } else {
 615                 INIT_WORK(&cmd->work, target_complete_ok_work);
 616         }
 617
 618         cmd->t_state = TRANSPORT_COMPLETE;
 619         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 620         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 621
 622         queue_work(target_completion_wq, &cmd->work);
 623 }
 624 EXPORT_SYMBOL(target_complete_cmd);
 625
 626 static void target_add_to_state_list(struct se_cmd *cmd)
 627 {
 628         struct se_device *dev = cmd->se_dev;
 629         unsigned long flags;
 630
 631         spin_lock_irqsave(&dev->execute_task_lock, flags);
 632         if (!cmd->state_active) {
 633                 list_add_tail(&cmd->state_list, &dev->state_list);
 634                 cmd->state_active = true;
 635         }
 636         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 637 }
 638
 639 /*
 640  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 641  */
 642 static void transport_write_pending_qf(struct se_cmd *cmd);
 643 static void transport_complete_qf(struct se_cmd *cmd);
 644
 645 static void target_qf_do_work(struct work_struct *work)
 646 {
 647         struct se_device *dev = container_of(work, struct se_device,
 648                                         qf_work_queue);
 649         LIST_HEAD(qf_cmd_list);
 650         struct se_cmd *cmd, *cmd_tmp;
 651
 652         spin_lock_irq(&dev->qf_cmd_lock);
 653         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 654         spin_unlock_irq(&dev->qf_cmd_lock);
 655
 656         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 657                 list_del(&cmd->se_qf_node);
 658                 atomic_dec(&dev->dev_qf_count);
 659                 smp_mb__after_atomic_dec();
 660
 661                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 662                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 663                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 664                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 665                         : "UNKNOWN");
 666
 667                 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 668                         transport_write_pending_qf(cmd);
 669                 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 670                         transport_complete_qf(cmd);
 671         }
 672 }
 673
 674 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 675 {
 676         switch (cmd->data_direction) {
 677         case DMA_NONE:
 678                 return "NONE";
 679         case DMA_FROM_DEVICE:
 680                 return "READ";
 681         case DMA_TO_DEVICE:
 682                 return "WRITE";
 683         case DMA_BIDIRECTIONAL:
 684                 return "BIDI";
 685         default:
 686                 break;
 687         }
 688
 689         return "UNKNOWN";
 690 }
 691
 692 void transport_dump_dev_state(
 693         struct se_device *dev,
 694         char *b,
 695         int *bl)
 696 {
 697         *bl += sprintf(b + *bl, "Status: ");
 698         switch (dev->dev_status) {
 699         case TRANSPORT_DEVICE_ACTIVATED:
 700                 *bl += sprintf(b + *bl, "ACTIVATED");
 701                 break;
 702         case TRANSPORT_DEVICE_DEACTIVATED:
 703                 *bl += sprintf(b + *bl, "DEACTIVATED");
 704                 break;
 705         case TRANSPORT_DEVICE_SHUTDOWN:
 706                 *bl += sprintf(b + *bl, "SHUTDOWN");
 707                 break;
 708         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 709         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 710                 *bl += sprintf(b + *bl, "OFFLINE");
 711                 break;
 712         default:
 713                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 714                 break;
 715         }
 716
 717         *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 718         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 719                 dev->se_sub_dev->se_dev_attrib.block_size,
 720                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 721         *bl += sprintf(b + *bl, "        ");
 722 }
 723
 724 void transport_dump_vpd_proto_id(
 725         struct t10_vpd *vpd,
 726         unsigned char *p_buf,
 727         int p_buf_len)
 728 {
 729         unsigned char buf[VPD_TMP_BUF_SIZE];
 730         int len;
 731
 732         memset(buf, 0, VPD_TMP_BUF_SIZE);
 733         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 734
 735         switch (vpd->protocol_identifier) {
 736         case 0x00:
 737                 sprintf(buf+len, "Fibre Channel\n");
 738                 break;
 739         case 0x10:
 740                 sprintf(buf+len, "Parallel SCSI\n");
 741                 break;
 742         case 0x20:
 743                 sprintf(buf+len, "SSA\n");
 744                 break;
 745         case 0x30:
 746                 sprintf(buf+len, "IEEE 1394\n");
 747                 break;
 748         case 0x40:
 749                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 750                                 " Protocol\n");
 751                 break;
 752         case 0x50:
 753                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 754                 break;
 755         case 0x60:
 756                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 757                 break;
 758         case 0x70:
 759                 sprintf(buf+len, "Automation/Drive Interface Transport"
 760                                 " Protocol\n");
 761                 break;
 762         case 0x80:
 763                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 764                 break;
 765         default:
 766                 sprintf(buf+len, "Unknown 0x%02x\n",
 767                                 vpd->protocol_identifier);
 768                 break;
 769         }
 770
 771         if (p_buf)
 772                 strncpy(p_buf, buf, p_buf_len);
 773         else
 774                 pr_debug("%s", buf);
 775 }
 776
 777 void
 778 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 779 {
 780         /*
 781          * Check if the Protocol Identifier Valid (PIV) bit is set..
 782          *
 783          * from spc3r23.pdf section 7.5.1
 784          */
 785          if (page_83[1] & 0x80) {
 786                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 787                 vpd->protocol_identifier_set = 1;
 788                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 789         }
 790 }
 791 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 792
 793 int transport_dump_vpd_assoc(
 794         struct t10_vpd *vpd,
 795         unsigned char *p_buf,
 796         int p_buf_len)
 797 {
 798         unsigned char buf[VPD_TMP_BUF_SIZE];
 799         int ret = 0;
 800         int len;
 801
 802         memset(buf, 0, VPD_TMP_BUF_SIZE);
 803         len = sprintf(buf, "T10 VPD Identifier Association: ");
 804
 805         switch (vpd->association) {
 806         case 0x00:
 807                 sprintf(buf+len, "addressed logical unit\n");
 808                 break;
 809         case 0x10:
 810                 sprintf(buf+len, "target port\n");
 811                 break;
 812         case 0x20:
 813                 sprintf(buf+len, "SCSI target device\n");
 814                 break;
 815         default:
 816                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 817                 ret = -EINVAL;
 818                 break;
 819         }
 820
 821         if (p_buf)
 822                 strncpy(p_buf, buf, p_buf_len);
 823         else
 824                 pr_debug("%s", buf);
 825
 826         return ret;
 827 }
 828
 829 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 830 {
 831         /*
 832          * The VPD identification association..
 833          *
 834          * from spc3r23.pdf Section 7.6.3.1 Table 297
 835          */
 836         vpd->association = (page_83[1] & 0x30);
 837         return transport_dump_vpd_assoc(vpd, NULL, 0);
 838 }
 839 EXPORT_SYMBOL(transport_set_vpd_assoc);
 840
 841 int transport_dump_vpd_ident_type(
 842         struct t10_vpd *vpd,
 843         unsigned char *p_buf,
 844         int p_buf_len)
 845 {
 846         unsigned char buf[VPD_TMP_BUF_SIZE];
 847         int ret = 0;
 848         int len;
 849
 850         memset(buf, 0, VPD_TMP_BUF_SIZE);
 851         len = sprintf(buf, "T10 VPD Identifier Type: ");
 852
 853         switch (vpd->device_identifier_type) {
 854         case 0x00:
 855                 sprintf(buf+len, "Vendor specific\n");
 856                 break;
 857         case 0x01:
 858                 sprintf(buf+len, "T10 Vendor ID based\n");
 859                 break;
 860         case 0x02:
 861                 sprintf(buf+len, "EUI-64 based\n");
 862                 break;
 863         case 0x03:
 864                 sprintf(buf+len, "NAA\n");
 865                 break;
 866         case 0x04:
 867                 sprintf(buf+len, "Relative target port identifier\n");
 868                 break;
 869         case 0x08:
 870                 sprintf(buf+len, "SCSI name string\n");
 871                 break;
 872         default:
 873                 sprintf(buf+len, "Unsupported: 0x%02x\n",
 874                                 vpd->device_identifier_type);
 875                 ret = -EINVAL;
 876                 break;
 877         }
 878
 879         if (p_buf) {
 880                 if (p_buf_len < strlen(buf)+1)
 881                         return -EINVAL;
 882                 strncpy(p_buf, buf, p_buf_len);
 883         } else {
 884                 pr_debug("%s", buf);
 885         }
 886
 887         return ret;
 888 }
 889
 890 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 891 {
 892         /*
 893          * The VPD identifier type..
 894          *
 895          * from spc3r23.pdf Section 7.6.3.1 Table 298
 896          */
 897         vpd->device_identifier_type = (page_83[1] & 0x0f);
 898         return transport_dump_vpd_ident_type(vpd, NULL, 0);
 899 }
 900 EXPORT_SYMBOL(transport_set_vpd_ident_type);
 901
 902 int transport_dump_vpd_ident(
 903         struct t10_vpd *vpd,
 904         unsigned char *p_buf,
 905         int p_buf_len)
 906 {
 907         unsigned char buf[VPD_TMP_BUF_SIZE];
 908         int ret = 0;
 909
 910         memset(buf, 0, VPD_TMP_BUF_SIZE);
 911
 912         switch (vpd->device_identifier_code_set) {
 913         case 0x01: /* Binary */
 914                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 915                         &vpd->device_identifier[0]);
 916                 break;
 917         case 0x02: /* ASCII */
 918                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 919                         &vpd->device_identifier[0]);
 920                 break;
 921         case 0x03: /* UTF-8 */
 922                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 923                         &vpd->device_identifier[0]);
 924                 break;
 925         default:
 926                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 927                         " 0x%02x", vpd->device_identifier_code_set);
 928                 ret = -EINVAL;
 929                 break;
 930         }
 931
 932         if (p_buf)
 933                 strncpy(p_buf, buf, p_buf_len);
 934         else
 935                 pr_debug("%s", buf);
 936
 937         return ret;
 938 }
 939
 940 int
 941 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 942 {
 943         static const char hex_str[] = "0123456789abcdef";
 944         int j = 0, i = 4; /* offset to start of the identifer */
 945
 946         /*
 947          * The VPD Code Set (encoding)
 948          *
 949          * from spc3r23.pdf Section 7.6.3.1 Table 296
 950          */
 951         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
 952         switch (vpd->device_identifier_code_set) {
 953         case 0x01: /* Binary */
 954                 vpd->device_identifier[j++] =
 955                                 hex_str[vpd->device_identifier_type];
 956                 while (i < (4 + page_83[3])) {
 957                         vpd->device_identifier[j++] =
 958                                 hex_str[(page_83[i] & 0xf0) >> 4];
 959                         vpd->device_identifier[j++] =
 960                                 hex_str[page_83[i] & 0x0f];
 961                         i++;
 962                 }
 963                 break;
 964         case 0x02: /* ASCII */
 965         case 0x03: /* UTF-8 */
 966                 while (i < (4 + page_83[3]))
 967                         vpd->device_identifier[j++] = page_83[i++];
 968                 break;
 969         default:
 970                 break;
 971         }
 972
 973         return transport_dump_vpd_ident(vpd, NULL, 0);
 974 }
 975 EXPORT_SYMBOL(transport_set_vpd_ident);
 976
 977 static void core_setup_task_attr_emulation(struct se_device *dev)
 978 {
 979         /*
 980          * If this device is from Target_Core_Mod/pSCSI, disable the
 981          * SAM Task Attribute emulation.
 982          *
 983          * This is currently not available in upsream Linux/SCSI Target
 984          * mode code, and is assumed to be disabled while using TCM/pSCSI.
 985          */
 986         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
 987                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
 988                 return;
 989         }
 990
 991         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
 992         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
 993                 " device\n", dev->transport->name,
 994                 dev->transport->get_device_rev(dev));
 995 }
 996
 997 static void scsi_dump_inquiry(struct se_device *dev)
 998 {
 999         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1000         char buf[17];
1001         int i, device_type;
1002         /*
1003          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1004          */
1005         for (i = 0; i < 8; i++)
1006                 if (wwn->vendor[i] >= 0x20)
1007                         buf[i] = wwn->vendor[i];
1008                 else
1009                         buf[i] = ' ';
1010         buf[i] = '\0';
1011         pr_debug("  Vendor: %s\n", buf);
1012
1013         for (i = 0; i < 16; i++)
1014                 if (wwn->model[i] >= 0x20)
1015                         buf[i] = wwn->model[i];
1016                 else
1017                         buf[i] = ' ';
1018         buf[i] = '\0';
1019         pr_debug("  Model: %s\n", buf);
1020
1021         for (i = 0; i < 4; i++)
1022                 if (wwn->revision[i] >= 0x20)
1023                         buf[i] = wwn->revision[i];
1024                 else
1025                         buf[i] = ' ';
1026         buf[i] = '\0';
1027         pr_debug("  Revision: %s\n", buf);
1028
1029         device_type = dev->transport->get_device_type(dev);
1030         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1031         pr_debug("                 ANSI SCSI revision: %02x\n",
1032                                 dev->transport->get_device_rev(dev));
1033 }
1034
1035 struct se_device *transport_add_device_to_core_hba(
1036         struct se_hba *hba,
1037         struct se_subsystem_api *transport,
1038         struct se_subsystem_dev *se_dev,
1039         u32 device_flags,
1040         void *transport_dev,
1041         struct se_dev_limits *dev_limits,
1042         const char *inquiry_prod,
1043         const char *inquiry_rev)
1044 {
1045         int force_pt;
1046         struct se_device  *dev;
1047
1048         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1049         if (!dev) {
1050                 pr_err("Unable to allocate memory for se_dev_t\n");
1051                 return NULL;
1052         }
1053
1054         dev->dev_flags          = device_flags;
1055         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1056         dev->dev_ptr            = transport_dev;
1057         dev->se_hba             = hba;
1058         dev->se_sub_dev         = se_dev;
1059         dev->transport          = transport;
1060         INIT_LIST_HEAD(&dev->dev_list);
1061         INIT_LIST_HEAD(&dev->dev_sep_list);
1062         INIT_LIST_HEAD(&dev->dev_tmr_list);
1063         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1064         INIT_LIST_HEAD(&dev->state_list);
1065         INIT_LIST_HEAD(&dev->qf_cmd_list);
1066         spin_lock_init(&dev->execute_task_lock);
1067         spin_lock_init(&dev->delayed_cmd_lock);
1068         spin_lock_init(&dev->dev_reservation_lock);
1069         spin_lock_init(&dev->dev_status_lock);
1070         spin_lock_init(&dev->se_port_lock);
1071         spin_lock_init(&dev->se_tmr_lock);
1072         spin_lock_init(&dev->qf_cmd_lock);
1073         atomic_set(&dev->dev_ordered_id, 0);
1074
1075         se_dev_set_default_attribs(dev, dev_limits);
1076
1077         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1078         dev->creation_time = get_jiffies_64();
1079         spin_lock_init(&dev->stats_lock);
1080
1081         spin_lock(&hba->device_lock);
1082         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1083         hba->dev_count++;
1084         spin_unlock(&hba->device_lock);
1085         /*
1086          * Setup the SAM Task Attribute emulation for struct se_device
1087          */
1088         core_setup_task_attr_emulation(dev);
1089         /*
1090          * Force PR and ALUA passthrough emulation with internal object use.
1091          */
1092         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1093         /*
1094          * Setup the Reservations infrastructure for struct se_device
1095          */
1096         core_setup_reservations(dev, force_pt);
1097         /*
1098          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1099          */
1100         if (core_setup_alua(dev, force_pt) < 0)
1101                 goto err_dev_list;
1102
1103         /*
1104          * Startup the struct se_device processing thread
1105          */
1106         dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1107                                       dev->transport->name);
1108         if (!dev->tmr_wq) {
1109                 pr_err("Unable to create tmr workqueue for %s\n",
1110                         dev->transport->name);
1111                 goto err_dev_list;
1112         }
1113         /*
1114          * Setup work_queue for QUEUE_FULL
1115          */
1116         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1117         /*
1118          * Preload the initial INQUIRY const values if we are doing
1119          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1120          * passthrough because this is being provided by the backend LLD.
1121          * This is required so that transport_get_inquiry() copies these
1122          * originals once back into DEV_T10_WWN(dev) for the virtual device
1123          * setup.
1124          */
1125         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1126                 if (!inquiry_prod || !inquiry_rev) {
1127                         pr_err("All non TCM/pSCSI plugins require"
1128                                 " INQUIRY consts\n");
1129                         goto err_wq;
1130                 }
1131
1132                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1133                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1134                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1135         }
1136         scsi_dump_inquiry(dev);
1137
1138         return dev;
1139
1140 err_wq:
1141         destroy_workqueue(dev->tmr_wq);
1142 err_dev_list:
1143         spin_lock(&hba->device_lock);
1144         list_del(&dev->dev_list);
1145         hba->dev_count--;
1146         spin_unlock(&hba->device_lock);
1147
1148         se_release_vpd_for_dev(dev);
1149
1150         kfree(dev);
1151
1152         return NULL;
1153 }
1154 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1155
1156 int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1157 {
1158         struct se_device *dev = cmd->se_dev;
1159
1160         if (cmd->unknown_data_length) {
1161                 cmd->data_length = size;
1162         } else if (size != cmd->data_length) {
1163                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1164                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1165                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1166                                 cmd->data_length, size, cmd->t_task_cdb[0]);
1167
1168                 cmd->cmd_spdtl = size;
1169
1170                 if (cmd->data_direction == DMA_TO_DEVICE) {
1171                         pr_err("Rejecting underflow/overflow"
1172                                         " WRITE data\n");
1173                         goto out_invalid_cdb_field;
1174                 }
1175                 /*
1176                  * Reject READ_* or WRITE_* with overflow/underflow for
1177                  * type SCF_SCSI_DATA_CDB.
1178                  */
1179                 if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1180                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1181                                 " CDB on non 512-byte sector setup subsystem"
1182                                 " plugin: %s\n", dev->transport->name);
1183                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1184                         goto out_invalid_cdb_field;
1185                 }
1186
1187                 if (size > cmd->data_length) {
1188                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1189                         cmd->residual_count = (size - cmd->data_length);
1190                 } else {
1191                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1192                         cmd->residual_count = (cmd->data_length - size);
1193                 }
1194                 cmd->data_length = size;
1195         }
1196
1197         return 0;
1198
1199 out_invalid_cdb_field:
1200         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1201         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1202         return -EINVAL;
1203 }
1204
1205 /*
1206  * Used by fabric modules containing a local struct se_cmd within their
1207  * fabric dependent per I/O descriptor.
1208  */
1209 void transport_init_se_cmd(
1210         struct se_cmd *cmd,
1211         struct target_core_fabric_ops *tfo,
1212         struct se_session *se_sess,
1213         u32 data_length,
1214         int data_direction,
1215         int task_attr,
1216         unsigned char *sense_buffer)
1217 {
1218         INIT_LIST_HEAD(&cmd->se_lun_node);
1219         INIT_LIST_HEAD(&cmd->se_delayed_node);
1220         INIT_LIST_HEAD(&cmd->se_qf_node);
1221         INIT_LIST_HEAD(&cmd->se_cmd_list);
1222         INIT_LIST_HEAD(&cmd->state_list);
1223         init_completion(&cmd->transport_lun_fe_stop_comp);
1224         init_completion(&cmd->transport_lun_stop_comp);
1225         init_completion(&cmd->t_transport_stop_comp);
1226         init_completion(&cmd->cmd_wait_comp);
1227         init_completion(&cmd->task_stop_comp);
1228         spin_lock_init(&cmd->t_state_lock);
1229         cmd->transport_state = CMD_T_DEV_ACTIVE;
1230
1231         cmd->se_tfo = tfo;
1232         cmd->se_sess = se_sess;
1233         cmd->data_length = data_length;
1234         cmd->data_direction = data_direction;
1235         cmd->sam_task_attr = task_attr;
1236         cmd->sense_buffer = sense_buffer;
1237
1238         cmd->state_active = false;
1239 }
1240 EXPORT_SYMBOL(transport_init_se_cmd);
1241
1242 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1243 {
1244         /*
1245          * Check if SAM Task Attribute emulation is enabled for this
1246          * struct se_device storage object
1247          */
1248         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1249                 return 0;
1250
1251         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1252                 pr_debug("SAM Task Attribute ACA"
1253                         " emulation is not supported\n");
1254                 return -EINVAL;
1255         }
1256         /*
1257          * Used to determine when ORDERED commands should go from
1258          * Dormant to Active status.
1259          */
1260         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1261         smp_mb__after_atomic_inc();
1262         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1263                         cmd->se_ordered_id, cmd->sam_task_attr,
1264                         cmd->se_dev->transport->name);
1265         return 0;
1266 }
1267
1268 /*      target_setup_cmd_from_cdb():
1269  *
1270  *      Called from fabric RX Thread.
1271  */
1272 int target_setup_cmd_from_cdb(
1273         struct se_cmd *cmd,
1274         unsigned char *cdb)
1275 {
1276         struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1277         u32 pr_reg_type = 0;
1278         u8 alua_ascq = 0;
1279         unsigned long flags;
1280         int ret;
1281
1282         /*
1283          * Ensure that the received CDB is less than the max (252 + 8) bytes
1284          * for VARIABLE_LENGTH_CMD
1285          */
1286         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1287                 pr_err("Received SCSI CDB with command_size: %d that"
1288                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1289                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1290                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1291                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1292                 return -EINVAL;
1293         }
1294         /*
1295          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1296          * allocate the additional extended CDB buffer now..  Otherwise
1297          * setup the pointer from __t_task_cdb to t_task_cdb.
1298          */
1299         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1300                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1301                                                 GFP_KERNEL);
1302                 if (!cmd->t_task_cdb) {
1303                         pr_err("Unable to allocate cmd->t_task_cdb"
1304                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1305                                 scsi_command_size(cdb),
1306                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1307                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1308                         cmd->scsi_sense_reason =
1309                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1310                         return -ENOMEM;
1311                 }
1312         } else
1313                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1314         /*
1315          * Copy the original CDB into cmd->
1316          */
1317         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1318
1319         /*
1320          * Check for an existing UNIT ATTENTION condition
1321          */
1322         if (core_scsi3_ua_check(cmd, cdb) < 0) {
1323                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1324                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1325                 return -EINVAL;
1326         }
1327
1328         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1329         if (ret != 0) {
1330                 /*
1331                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1332                  * The ALUA additional sense code qualifier (ASCQ) is determined
1333                  * by the ALUA primary or secondary access state..
1334                  */
1335                 if (ret > 0) {
1336                         pr_debug("[%s]: ALUA TG Port not available, "
1337                                 "SenseKey: NOT_READY, ASC/ASCQ: "
1338                                 "0x04/0x%02x\n",
1339                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
1340
1341                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
1342                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1343                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1344                         return -EINVAL;
1345                 }
1346                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1347                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1348                 return -EINVAL;
1349         }
1350
1351         /*
1352          * Check status for SPC-3 Persistent Reservations
1353          */
1354         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1355                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1356                                         cmd, cdb, pr_reg_type) != 0) {
1357                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1358                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1359                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1360                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1361                         return -EBUSY;
1362                 }
1363                 /*
1364                  * This means the CDB is allowed for the SCSI Initiator port
1365                  * when said port is *NOT* holding the legacy SPC-2 or
1366                  * SPC-3 Persistent Reservation.
1367                  */
1368         }
1369
1370         ret = cmd->se_dev->transport->parse_cdb(cmd);
1371         if (ret < 0)
1372                 return ret;
1373
1374         spin_lock_irqsave(&cmd->t_state_lock, flags);
1375         cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1376         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1377
1378         /*
1379          * Check for SAM Task Attribute Emulation
1380          */
1381         if (transport_check_alloc_task_attr(cmd) < 0) {
1382                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1383                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1384                 return -EINVAL;
1385         }
1386         spin_lock(&cmd->se_lun->lun_sep_lock);
1387         if (cmd->se_lun->lun_sep)
1388                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1389         spin_unlock(&cmd->se_lun->lun_sep_lock);
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1393
1394 /*
1395  * Used by fabric module frontends to queue tasks directly.
1396  * Many only be used from process context only
1397  */
1398 int transport_handle_cdb_direct(
1399         struct se_cmd *cmd)
1400 {
1401         int ret;
1402
1403         if (!cmd->se_lun) {
1404                 dump_stack();
1405                 pr_err("cmd->se_lun is NULL\n");
1406                 return -EINVAL;
1407         }
1408         if (in_interrupt()) {
1409                 dump_stack();
1410                 pr_err("transport_generic_handle_cdb cannot be called"
1411                                 " from interrupt context\n");
1412                 return -EINVAL;
1413         }
1414         /*
1415          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1416          * outstanding descriptors are handled correctly during shutdown via
1417          * transport_wait_for_tasks()
1418          *
1419          * Also, we don't take cmd->t_state_lock here as we only expect
1420          * this to be called for initial descriptor submission.
1421          */
1422         cmd->t_state = TRANSPORT_NEW_CMD;
1423         cmd->transport_state |= CMD_T_ACTIVE;
1424
1425         /*
1426          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1427          * so follow TRANSPORT_NEW_CMD processing thread context usage
1428          * and call transport_generic_request_failure() if necessary..
1429          */
1430         ret = transport_generic_new_cmd(cmd);
1431         if (ret < 0)
1432                 transport_generic_request_failure(cmd);
1433
1434         return 0;
1435 }
1436 EXPORT_SYMBOL(transport_handle_cdb_direct);
1437
1438 /**
1439  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1440  *
1441  * @se_cmd: command descriptor to submit
1442  * @se_sess: associated se_sess for endpoint
1443  * @cdb: pointer to SCSI CDB
1444  * @sense: pointer to SCSI sense buffer
1445  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1446  * @data_length: fabric expected data transfer length
1447  * @task_addr: SAM task attribute
1448  * @data_dir: DMA data direction
1449  * @flags: flags for command submission from target_sc_flags_tables
1450  *
1451  * Returns non zero to signal active I/O shutdown failure.  All other
1452  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1453  * but still return zero here.
1454  *
1455  * This may only be called from process context, and also currently
1456  * assumes internal allocation of fabric payload buffer by target-core.
1457  **/
1458 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1459                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1460                 u32 data_length, int task_attr, int data_dir, int flags)
1461 {
1462         struct se_portal_group *se_tpg;
1463         int rc;
1464
1465         se_tpg = se_sess->se_tpg;
1466         BUG_ON(!se_tpg);
1467         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1468         BUG_ON(in_interrupt());
1469         /*
1470          * Initialize se_cmd for target operation.  From this point
1471          * exceptions are handled by sending exception status via
1472          * target_core_fabric_ops->queue_status() callback
1473          */
1474         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1475                                 data_length, data_dir, task_attr, sense);
1476         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1477                 se_cmd->unknown_data_length = 1;
1478         /*
1479          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1480          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1481          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1482          * kref_put() to happen during fabric packet acknowledgement.
1483          */
1484         rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1485         if (rc)
1486                 return rc;
1487         /*
1488          * Signal bidirectional data payloads to target-core
1489          */
1490         if (flags & TARGET_SCF_BIDI_OP)
1491                 se_cmd->se_cmd_flags |= SCF_BIDI;
1492         /*
1493          * Locate se_lun pointer and attach it to struct se_cmd
1494          */
1495         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1496                 transport_send_check_condition_and_sense(se_cmd,
1497                                 se_cmd->scsi_sense_reason, 0);
1498                 target_put_sess_cmd(se_sess, se_cmd);
1499                 return 0;
1500         }
1501
1502         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1503         if (rc != 0) {
1504                 transport_generic_request_failure(se_cmd);
1505                 return 0;
1506         }
1507
1508         /*
1509          * Check if we need to delay processing because of ALUA
1510          * Active/NonOptimized primary access state..
1511          */
1512         core_alua_check_nonop_delay(se_cmd);
1513
1514         transport_handle_cdb_direct(se_cmd);
1515         return 0;
1516 }
1517 EXPORT_SYMBOL(target_submit_cmd);
1518
1519 static void target_complete_tmr_failure(struct work_struct *work)
1520 {
1521         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1522
1523         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1524         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1525         transport_generic_free_cmd(se_cmd, 0);
1526 }
1527
1528 /**
1529  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1530  *                     for TMR CDBs
1531  *
1532  * @se_cmd: command descriptor to submit
1533  * @se_sess: associated se_sess for endpoint
1534  * @sense: pointer to SCSI sense buffer
1535  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1536  * @fabric_context: fabric context for TMR req
1537  * @tm_type: Type of TM request
1538  * @gfp: gfp type for caller
1539  * @tag: referenced task tag for TMR_ABORT_TASK
1540  * @flags: submit cmd flags
1541  *
1542  * Callable from all contexts.
1543  **/
1544
1545 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1546                 unsigned char *sense, u32 unpacked_lun,
1547                 void *fabric_tmr_ptr, unsigned char tm_type,
1548                 gfp_t gfp, unsigned int tag, int flags)
1549 {
1550         struct se_portal_group *se_tpg;
1551         int ret;
1552
1553         se_tpg = se_sess->se_tpg;
1554         BUG_ON(!se_tpg);
1555
1556         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1557                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1558         /*
1559          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1560          * allocation failure.
1561          */
1562         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1563         if (ret < 0)
1564                 return -ENOMEM;
1565
1566         if (tm_type == TMR_ABORT_TASK)
1567                 se_cmd->se_tmr_req->ref_task_tag = tag;
1568
1569         /* See target_submit_cmd for commentary */
1570         ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1571         if (ret) {
1572                 core_tmr_release_req(se_cmd->se_tmr_req);
1573                 return ret;
1574         }
1575
1576         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1577         if (ret) {
1578                 /*
1579                  * For callback during failure handling, push this work off
1580                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1581                  */
1582                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1583                 schedule_work(&se_cmd->work);
1584                 return 0;
1585         }
1586         transport_generic_handle_tmr(se_cmd);
1587         return 0;
1588 }
1589 EXPORT_SYMBOL(target_submit_tmr);
1590
1591 /*
1592  * If the cmd is active, request it to be stopped and sleep until it
1593  * has completed.
1594  */
1595 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1596 {
1597         bool was_active = false;
1598
1599         if (cmd->transport_state & CMD_T_BUSY) {
1600                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1601                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1602
1603                 pr_debug("cmd %p waiting to complete\n", cmd);
1604                 wait_for_completion(&cmd->task_stop_comp);
1605                 pr_debug("cmd %p stopped successfully\n", cmd);
1606
1607                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1608                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1609                 cmd->transport_state &= ~CMD_T_BUSY;
1610                 was_active = true;
1611         }
1612
1613         return was_active;
1614 }
1615
1616 /*
1617  * Handle SAM-esque emulation for generic transport request failures.
1618  */
1619 void transport_generic_request_failure(struct se_cmd *cmd)
1620 {
1621         int ret = 0;
1622
1623         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1624                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1625                 cmd->t_task_cdb[0]);
1626         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1627                 cmd->se_tfo->get_cmd_state(cmd),
1628                 cmd->t_state, cmd->scsi_sense_reason);
1629         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1630                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1631                 (cmd->transport_state & CMD_T_STOP) != 0,
1632                 (cmd->transport_state & CMD_T_SENT) != 0);
1633
1634         /*
1635          * For SAM Task Attribute emulation for failed struct se_cmd
1636          */
1637         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1638                 transport_complete_task_attr(cmd);
1639
1640         switch (cmd->scsi_sense_reason) {
1641         case TCM_NON_EXISTENT_LUN:
1642         case TCM_UNSUPPORTED_SCSI_OPCODE:
1643         case TCM_INVALID_CDB_FIELD:
1644         case TCM_INVALID_PARAMETER_LIST:
1645         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1646         case TCM_UNKNOWN_MODE_PAGE:
1647         case TCM_WRITE_PROTECTED:
1648         case TCM_ADDRESS_OUT_OF_RANGE:
1649         case TCM_CHECK_CONDITION_ABORT_CMD:
1650         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1651         case TCM_CHECK_CONDITION_NOT_READY:
1652                 break;
1653         case TCM_RESERVATION_CONFLICT:
1654                 /*
1655                  * No SENSE Data payload for this case, set SCSI Status
1656                  * and queue the response to $FABRIC_MOD.
1657                  *
1658                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1659                  */
1660                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1661                 /*
1662                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1663                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1664                  * CONFLICT STATUS.
1665                  *
1666                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1667                  */
1668                 if (cmd->se_sess &&
1669                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1670                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1671                                 cmd->orig_fe_lun, 0x2C,
1672                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1673
1674                 ret = cmd->se_tfo->queue_status(cmd);
1675                 if (ret == -EAGAIN || ret == -ENOMEM)
1676                         goto queue_full;
1677                 goto check_stop;
1678         default:
1679                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1680                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1681                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1682                 break;
1683         }
1684
1685         ret = transport_send_check_condition_and_sense(cmd,
1686                         cmd->scsi_sense_reason, 0);
1687         if (ret == -EAGAIN || ret == -ENOMEM)
1688                 goto queue_full;
1689
1690 check_stop:
1691         transport_lun_remove_cmd(cmd);
1692         if (!transport_cmd_check_stop_to_fabric(cmd))
1693                 ;
1694         return;
1695
1696 queue_full:
1697         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1698         transport_handle_queue_full(cmd, cmd->se_dev);
1699 }
1700 EXPORT_SYMBOL(transport_generic_request_failure);
1701
1702 static void __target_execute_cmd(struct se_cmd *cmd)
1703 {
1704         int error = 0;
1705
1706         spin_lock_irq(&cmd->t_state_lock);
1707         cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1708         spin_unlock_irq(&cmd->t_state_lock);
1709
1710         if (cmd->execute_cmd)
1711                 error = cmd->execute_cmd(cmd);
1712
1713         if (error) {
1714                 spin_lock_irq(&cmd->t_state_lock);
1715                 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1716                 spin_unlock_irq(&cmd->t_state_lock);
1717
1718                 transport_generic_request_failure(cmd);
1719         }
1720 }
1721
1722 void target_execute_cmd(struct se_cmd *cmd)
1723 {
1724         struct se_device *dev = cmd->se_dev;
1725
1726         /*
1727          * If the received CDB has aleady been aborted stop processing it here.
1728          */
1729         if (transport_check_aborted_status(cmd, 1))
1730                 return;
1731
1732         /*
1733          * Determine if IOCTL context caller in requesting the stopping of this
1734          * command for LUN shutdown purposes.
1735          */
1736         spin_lock_irq(&cmd->t_state_lock);
1737         if (cmd->transport_state & CMD_T_LUN_STOP) {
1738                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1739                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1740
1741                 cmd->transport_state &= ~CMD_T_ACTIVE;
1742                 spin_unlock_irq(&cmd->t_state_lock);
1743                 complete(&cmd->transport_lun_stop_comp);
1744                 return;
1745         }
1746         /*
1747          * Determine if frontend context caller is requesting the stopping of
1748          * this command for frontend exceptions.
1749          */
1750         if (cmd->transport_state & CMD_T_STOP) {
1751                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1752                         __func__, __LINE__,
1753                         cmd->se_tfo->get_task_tag(cmd));
1754
1755                 spin_unlock_irq(&cmd->t_state_lock);
1756                 complete(&cmd->t_transport_stop_comp);
1757                 return;
1758         }
1759
1760         cmd->t_state = TRANSPORT_PROCESSING;
1761         spin_unlock_irq(&cmd->t_state_lock);
1762
1763         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1764                 goto execute;
1765
1766         /*
1767          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1768          * to allow the passed struct se_cmd list of tasks to the front of the list.
1769          */
1770         switch (cmd->sam_task_attr) {
1771         case MSG_HEAD_TAG:
1772                 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1773                          "se_ordered_id: %u\n",
1774                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1775                 goto execute;
1776         case MSG_ORDERED_TAG:
1777                 atomic_inc(&dev->dev_ordered_sync);
1778                 smp_mb__after_atomic_inc();
1779
1780                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1781                          " se_ordered_id: %u\n",
1782                          cmd->t_task_cdb[0], cmd->se_ordered_id);
1783
1784                 /*
1785                  * Execute an ORDERED command if no other older commands
1786                  * exist that need to be completed first.
1787                  */
1788                 if (!atomic_read(&dev->simple_cmds))
1789                         goto execute;
1790                 break;
1791         default:
1792                 /*
1793                  * For SIMPLE and UNTAGGED Task Attribute commands
1794                  */
1795                 atomic_inc(&dev->simple_cmds);
1796                 smp_mb__after_atomic_inc();
1797                 break;
1798         }
1799
1800         if (atomic_read(&dev->dev_ordered_sync) != 0) {
1801                 spin_lock(&dev->delayed_cmd_lock);
1802                 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1803                 spin_unlock(&dev->delayed_cmd_lock);
1804
1805                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1806                         " delayed CMD list, se_ordered_id: %u\n",
1807                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1808                         cmd->se_ordered_id);
1809                 return;
1810         }
1811
1812 execute:
1813         /*
1814          * Otherwise, no ORDERED task attributes exist..
1815          */
1816         __target_execute_cmd(cmd);
1817 }
1818 EXPORT_SYMBOL(target_execute_cmd);
1819
1820 /*
1821  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
1822  */
1823 static int transport_get_sense_data(struct se_cmd *cmd)
1824 {
1825         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
1826         struct se_device *dev = cmd->se_dev;
1827         unsigned long flags;
1828         u32 offset = 0;
1829
1830         WARN_ON(!cmd->se_lun);
1831
1832         if (!dev)
1833                 return 0;
1834
1835         spin_lock_irqsave(&cmd->t_state_lock, flags);
1836         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
1837                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1838                 return 0;
1839         }
1840
1841         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
1842                 goto out;
1843
1844         if (!dev->transport->get_sense_buffer) {
1845                 pr_err("dev->transport->get_sense_buffer is NULL\n");
1846                 goto out;
1847         }
1848
1849         sense_buffer = dev->transport->get_sense_buffer(cmd);
1850         if (!sense_buffer) {
1851                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
1852                         " sense buffer for task with sense\n",
1853                         cmd->se_tfo->get_task_tag(cmd), cmd);
1854                 goto out;
1855         }
1856
1857         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1858
1859         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
1860
1861         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
1862
1863         /* Automatically padded */
1864         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
1865
1866         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
1867                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
1868         return 0;
1869
1870 out:
1871         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1872         return -1;
1873 }
1874
1875 /*
1876  * Process all commands up to the last received ORDERED task attribute which
1877  * requires another blocking boundary
1878  */
1879 static void target_restart_delayed_cmds(struct se_device *dev)
1880 {
1881         for (;;) {
1882                 struct se_cmd *cmd;
1883
1884                 spin_lock(&dev->delayed_cmd_lock);
1885                 if (list_empty(&dev->delayed_cmd_list)) {
1886                         spin_unlock(&dev->delayed_cmd_lock);
1887                         break;
1888                 }
1889
1890                 cmd = list_entry(dev->delayed_cmd_list.next,
1891                                  struct se_cmd, se_delayed_node);
1892                 list_del(&cmd->se_delayed_node);
1893                 spin_unlock(&dev->delayed_cmd_lock);
1894
1895                 __target_execute_cmd(cmd);
1896
1897                 if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1898                         break;
1899         }
1900 }
1901
1902 /*
1903  * Called from I/O completion to determine which dormant/delayed
1904  * and ordered cmds need to have their tasks added to the execution queue.
1905  */
1906 static void transport_complete_task_attr(struct se_cmd *cmd)
1907 {
1908         struct se_device *dev = cmd->se_dev;
1909
1910         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1911                 atomic_dec(&dev->simple_cmds);
1912                 smp_mb__after_atomic_dec();
1913                 dev->dev_cur_ordered_id++;
1914                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1915                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1916                         cmd->se_ordered_id);
1917         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1918                 dev->dev_cur_ordered_id++;
1919                 pr_debug("Incremented dev_cur_ordered_id: %u for"
1920                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1921                         cmd->se_ordered_id);
1922         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1923                 atomic_dec(&dev->dev_ordered_sync);
1924                 smp_mb__after_atomic_dec();
1925
1926                 dev->dev_cur_ordered_id++;
1927                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1928                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1929         }
1930
1931         target_restart_delayed_cmds(dev);
1932 }
1933
1934 static void transport_complete_qf(struct se_cmd *cmd)
1935 {
1936         int ret = 0;
1937
1938         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1939                 transport_complete_task_attr(cmd);
1940
1941         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1942                 ret = cmd->se_tfo->queue_status(cmd);
1943                 if (ret)
1944                         goto out;
1945         }
1946
1947         switch (cmd->data_direction) {
1948         case DMA_FROM_DEVICE:
1949                 ret = cmd->se_tfo->queue_data_in(cmd);
1950                 break;
1951         case DMA_TO_DEVICE:
1952                 if (cmd->t_bidi_data_sg) {
1953                         ret = cmd->se_tfo->queue_data_in(cmd);
1954                         if (ret < 0)
1955                                 break;
1956                 }
1957                 /* Fall through for DMA_TO_DEVICE */
1958         case DMA_NONE:
1959                 ret = cmd->se_tfo->queue_status(cmd);
1960                 break;
1961         default:
1962                 break;
1963         }
1964
1965 out:
1966         if (ret < 0) {
1967                 transport_handle_queue_full(cmd, cmd->se_dev);
1968                 return;
1969         }
1970         transport_lun_remove_cmd(cmd);
1971         transport_cmd_check_stop_to_fabric(cmd);
1972 }
1973
1974 static void transport_handle_queue_full(
1975         struct se_cmd *cmd,
1976         struct se_device *dev)
1977 {
1978         spin_lock_irq(&dev->qf_cmd_lock);
1979         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
1980         atomic_inc(&dev->dev_qf_count);
1981         smp_mb__after_atomic_inc();
1982         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1983
1984         schedule_work(&cmd->se_dev->qf_work_queue);
1985 }
1986
1987 static void target_complete_ok_work(struct work_struct *work)
1988 {
1989         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
1990         int reason = 0, ret;
1991
1992         /*
1993          * Check if we need to move delayed/dormant tasks from cmds on the
1994          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
1995          * Attribute.
1996          */
1997         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1998                 transport_complete_task_attr(cmd);
1999         /*
2000          * Check to schedule QUEUE_FULL work, or execute an existing
2001          * cmd->transport_qf_callback()
2002          */
2003         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2004                 schedule_work(&cmd->se_dev->qf_work_queue);
2005
2006         /*
2007          * Check if we need to retrieve a sense buffer from
2008          * the struct se_cmd in question.
2009          */
2010         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2011                 if (transport_get_sense_data(cmd) < 0)
2012                         reason = TCM_NON_EXISTENT_LUN;
2013
2014                 if (cmd->scsi_status) {
2015                         ret = transport_send_check_condition_and_sense(
2016                                         cmd, reason, 1);
2017                         if (ret == -EAGAIN || ret == -ENOMEM)
2018                                 goto queue_full;
2019
2020                         transport_lun_remove_cmd(cmd);
2021                         transport_cmd_check_stop_to_fabric(cmd);
2022                         return;
2023                 }
2024         }
2025         /*
2026          * Check for a callback, used by amongst other things
2027          * XDWRITE_READ_10 emulation.
2028          */
2029         if (cmd->transport_complete_callback)
2030                 cmd->transport_complete_callback(cmd);
2031
2032         switch (cmd->data_direction) {
2033         case DMA_FROM_DEVICE:
2034                 spin_lock(&cmd->se_lun->lun_sep_lock);
2035                 if (cmd->se_lun->lun_sep) {
2036                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2037                                         cmd->data_length;
2038                 }
2039                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2040
2041                 ret = cmd->se_tfo->queue_data_in(cmd);
2042                 if (ret == -EAGAIN || ret == -ENOMEM)
2043                         goto queue_full;
2044                 break;
2045         case DMA_TO_DEVICE:
2046                 spin_lock(&cmd->se_lun->lun_sep_lock);
2047                 if (cmd->se_lun->lun_sep) {
2048                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2049                                 cmd->data_length;
2050                 }
2051                 spin_unlock(&cmd->se_lun->lun_sep_lock);
2052                 /*
2053                  * Check if we need to send READ payload for BIDI-COMMAND
2054                  */
2055                 if (cmd->t_bidi_data_sg) {
2056                         spin_lock(&cmd->se_lun->lun_sep_lock);
2057                         if (cmd->se_lun->lun_sep) {
2058                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2059                                         cmd->data_length;
2060                         }
2061                         spin_unlock(&cmd->se_lun->lun_sep_lock);
2062                         ret = cmd->se_tfo->queue_data_in(cmd);
2063                         if (ret == -EAGAIN || ret == -ENOMEM)
2064                                 goto queue_full;
2065                         break;
2066                 }
2067                 /* Fall through for DMA_TO_DEVICE */
2068         case DMA_NONE:
2069                 ret = cmd->se_tfo->queue_status(cmd);
2070                 if (ret == -EAGAIN || ret == -ENOMEM)
2071                         goto queue_full;
2072                 break;
2073         default:
2074                 break;
2075         }
2076
2077         transport_lun_remove_cmd(cmd);
2078         transport_cmd_check_stop_to_fabric(cmd);
2079         return;
2080
2081 queue_full:
2082         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2083                 " data_direction: %d\n", cmd, cmd->data_direction);
2084         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2085         transport_handle_queue_full(cmd, cmd->se_dev);
2086 }
2087
2088 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2089 {
2090         struct scatterlist *sg;
2091         int count;
2092
2093         for_each_sg(sgl, sg, nents, count)
2094                 __free_page(sg_page(sg));
2095
2096         kfree(sgl);
2097 }
2098
2099 static inline void transport_free_pages(struct se_cmd *cmd)
2100 {
2101         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2102                 return;
2103
2104         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2105         cmd->t_data_sg = NULL;
2106         cmd->t_data_nents = 0;
2107
2108         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2109         cmd->t_bidi_data_sg = NULL;
2110         cmd->t_bidi_data_nents = 0;
2111 }
2112
2113 /**
2114  * transport_release_cmd - free a command
2115  * @cmd:       command to free
2116  *
2117  * This routine unconditionally frees a command, and reference counting
2118  * or list removal must be done in the caller.
2119  */
2120 static void transport_release_cmd(struct se_cmd *cmd)
2121 {
2122         BUG_ON(!cmd->se_tfo);
2123
2124         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2125                 core_tmr_release_req(cmd->se_tmr_req);
2126         if (cmd->t_task_cdb != cmd->__t_task_cdb)
2127                 kfree(cmd->t_task_cdb);
2128         /*
2129          * If this cmd has been setup with target_get_sess_cmd(), drop
2130          * the kref and call ->release_cmd() in kref callback.
2131          */
2132          if (cmd->check_release != 0) {
2133                 target_put_sess_cmd(cmd->se_sess, cmd);
2134                 return;
2135         }
2136         cmd->se_tfo->release_cmd(cmd);
2137 }
2138
2139 /**
2140  * transport_put_cmd - release a reference to a command
2141  * @cmd:       command to release
2142  *
2143  * This routine releases our reference to the command and frees it if possible.
2144  */
2145 static void transport_put_cmd(struct se_cmd *cmd)
2146 {
2147         unsigned long flags;
2148
2149         spin_lock_irqsave(&cmd->t_state_lock, flags);
2150         if (atomic_read(&cmd->t_fe_count)) {
2151                 if (!atomic_dec_and_test(&cmd->t_fe_count))
2152                         goto out_busy;
2153         }
2154
2155         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2156                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2157                 target_remove_from_state_list(cmd);
2158         }
2159         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2160
2161         transport_free_pages(cmd);
2162         transport_release_cmd(cmd);
2163         return;
2164 out_busy:
2165         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2166 }
2167
2168 /*
2169  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2170  * allocating in the core.
2171  * @cmd:  Associated se_cmd descriptor
2172  * @mem:  SGL style memory for TCM WRITE / READ
2173  * @sg_mem_num: Number of SGL elements
2174  * @mem_bidi_in: SGL style memory for TCM BIDI READ
2175  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2176  *
2177  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2178  * of parameters.
2179  */
2180 int transport_generic_map_mem_to_cmd(
2181         struct se_cmd *cmd,
2182         struct scatterlist *sgl,
2183         u32 sgl_count,
2184         struct scatterlist *sgl_bidi,
2185         u32 sgl_bidi_count)
2186 {
2187         if (!sgl || !sgl_count)
2188                 return 0;
2189
2190         /*
2191          * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2192          * scatterlists already have been set to follow what the fabric
2193          * passes for the original expected data transfer length.
2194          */
2195         if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2196                 pr_warn("Rejecting SCSI DATA overflow for fabric using"
2197                         " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2198                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2199                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2200                 return -EINVAL;
2201         }
2202
2203         cmd->t_data_sg = sgl;
2204         cmd->t_data_nents = sgl_count;
2205
2206         if (sgl_bidi && sgl_bidi_count) {
2207                 cmd->t_bidi_data_sg = sgl_bidi;
2208                 cmd->t_bidi_data_nents = sgl_bidi_count;
2209         }
2210         cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2211         return 0;
2212 }
2213 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2214
2215 void *transport_kmap_data_sg(struct se_cmd *cmd)
2216 {
2217         struct scatterlist *sg = cmd->t_data_sg;
2218         struct page **pages;
2219         int i;
2220
2221         BUG_ON(!sg);
2222         /*
2223          * We need to take into account a possible offset here for fabrics like
2224          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2225          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2226          */
2227         if (!cmd->t_data_nents)
2228                 return NULL;
2229         else if (cmd->t_data_nents == 1)
2230                 return kmap(sg_page(sg)) + sg->offset;
2231
2232         /* >1 page. use vmap */
2233         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2234         if (!pages)
2235                 return NULL;
2236
2237         /* convert sg[] to pages[] */
2238         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2239                 pages[i] = sg_page(sg);
2240         }
2241
2242         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2243         kfree(pages);
2244         if (!cmd->t_data_vmap)
2245                 return NULL;
2246
2247         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2248 }
2249 EXPORT_SYMBOL(transport_kmap_data_sg);
2250
2251 void transport_kunmap_data_sg(struct se_cmd *cmd)
2252 {
2253         if (!cmd->t_data_nents) {
2254                 return;
2255         } else if (cmd->t_data_nents == 1) {
2256                 kunmap(sg_page(cmd->t_data_sg));
2257                 return;
2258         }
2259
2260         vunmap(cmd->t_data_vmap);
2261         cmd->t_data_vmap = NULL;
2262 }
2263 EXPORT_SYMBOL(transport_kunmap_data_sg);
2264
2265 static int
2266 transport_generic_get_mem(struct se_cmd *cmd)
2267 {
2268         u32 length = cmd->data_length;
2269         unsigned int nents;
2270         struct page *page;
2271         gfp_t zero_flag;
2272         int i = 0;
2273
2274         nents = DIV_ROUND_UP(length, PAGE_SIZE);
2275         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2276         if (!cmd->t_data_sg)
2277                 return -ENOMEM;
2278
2279         cmd->t_data_nents = nents;
2280         sg_init_table(cmd->t_data_sg, nents);
2281
2282         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2283
2284         while (length) {
2285                 u32 page_len = min_t(u32, length, PAGE_SIZE);
2286                 page = alloc_page(GFP_KERNEL | zero_flag);
2287                 if (!page)
2288                         goto out;
2289
2290                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2291                 length -= page_len;
2292                 i++;
2293         }
2294         return 0;
2295
2296 out:
2297         while (i >= 0) {
2298                 __free_page(sg_page(&cmd->t_data_sg[i]));
2299                 i--;
2300         }
2301         kfree(cmd->t_data_sg);
2302         cmd->t_data_sg = NULL;
2303         return -ENOMEM;
2304 }
2305
2306 /*
2307  * Allocate any required resources to execute the command.  For writes we
2308  * might not have the payload yet, so notify the fabric via a call to
2309  * ->write_pending instead. Otherwise place it on the execution queue.
2310  */
2311 int transport_generic_new_cmd(struct se_cmd *cmd)
2312 {
2313         int ret = 0;
2314
2315         /*
2316          * Determine is the TCM fabric module has already allocated physical
2317          * memory, and is directly calling transport_generic_map_mem_to_cmd()
2318          * beforehand.
2319          */
2320         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2321             cmd->data_length) {
2322                 ret = transport_generic_get_mem(cmd);
2323                 if (ret < 0)
2324                         goto out_fail;
2325         }
2326
2327         /* Workaround for handling zero-length control CDBs */
2328         if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && !cmd->data_length) {
2329                 spin_lock_irq(&cmd->t_state_lock);
2330                 cmd->t_state = TRANSPORT_COMPLETE;
2331                 cmd->transport_state |= CMD_T_ACTIVE;
2332                 spin_unlock_irq(&cmd->t_state_lock);
2333
2334                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
2335                         u8 ua_asc = 0, ua_ascq = 0;
2336
2337                         core_scsi3_ua_clear_for_request_sense(cmd,
2338                                         &ua_asc, &ua_ascq);
2339                 }
2340
2341                 INIT_WORK(&cmd->work, target_complete_ok_work);
2342                 queue_work(target_completion_wq, &cmd->work);
2343                 return 0;
2344         }
2345
2346         atomic_inc(&cmd->t_fe_count);
2347
2348         /*
2349          * If this command is not a write we can execute it right here,
2350          * for write buffers we need to notify the fabric driver first
2351          * and let it call back once the write buffers are ready.
2352          */
2353         target_add_to_state_list(cmd);
2354         if (cmd->data_direction != DMA_TO_DEVICE) {
2355                 target_execute_cmd(cmd);
2356                 return 0;
2357         }
2358
2359         spin_lock_irq(&cmd->t_state_lock);
2360         cmd->t_state = TRANSPORT_WRITE_PENDING;
2361         spin_unlock_irq(&cmd->t_state_lock);
2362
2363         transport_cmd_check_stop(cmd, false);
2364
2365         ret = cmd->se_tfo->write_pending(cmd);
2366         if (ret == -EAGAIN || ret == -ENOMEM)
2367                 goto queue_full;
2368
2369         if (ret < 0)
2370                 return ret;
2371         return 1;
2372
2373 out_fail:
2374         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2375         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2376         return -EINVAL;
2377 queue_full:
2378         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2379         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2380         transport_handle_queue_full(cmd, cmd->se_dev);
2381         return 0;
2382 }
2383 EXPORT_SYMBOL(transport_generic_new_cmd);
2384
2385 static void transport_write_pending_qf(struct se_cmd *cmd)
2386 {
2387         int ret;
2388
2389         ret = cmd->se_tfo->write_pending(cmd);
2390         if (ret == -EAGAIN || ret == -ENOMEM) {
2391                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2392                          cmd);
2393                 transport_handle_queue_full(cmd, cmd->se_dev);
2394         }
2395 }
2396
2397 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2398 {
2399         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2400                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2401                          transport_wait_for_tasks(cmd);
2402
2403                 transport_release_cmd(cmd);
2404         } else {
2405                 if (wait_for_tasks)
2406                         transport_wait_for_tasks(cmd);
2407
2408                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2409
2410                 if (cmd->se_lun)
2411                         transport_lun_remove_cmd(cmd);
2412
2413                 transport_put_cmd(cmd);
2414         }
2415 }
2416 EXPORT_SYMBOL(transport_generic_free_cmd);
2417
2418 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
2419  * @se_sess:    session to reference
2420  * @se_cmd:     command descriptor to add
2421  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2422  */
2423 static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2424                                bool ack_kref)
2425 {
2426         unsigned long flags;
2427         int ret = 0;
2428
2429         kref_init(&se_cmd->cmd_kref);
2430         /*
2431          * Add a second kref if the fabric caller is expecting to handle
2432          * fabric acknowledgement that requires two target_put_sess_cmd()
2433          * invocations before se_cmd descriptor release.
2434          */
2435         if (ack_kref == true) {
2436                 kref_get(&se_cmd->cmd_kref);
2437                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2438         }
2439
2440         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2441         if (se_sess->sess_tearing_down) {
2442                 ret = -ESHUTDOWN;
2443                 goto out;
2444         }
2445         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2446         se_cmd->check_release = 1;
2447
2448 out:
2449         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2450         return ret;
2451 }
2452
2453 static void target_release_cmd_kref(struct kref *kref)
2454 {
2455         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2456         struct se_session *se_sess = se_cmd->se_sess;
2457         unsigned long flags;
2458
2459         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2460         if (list_empty(&se_cmd->se_cmd_list)) {
2461                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2462                 se_cmd->se_tfo->release_cmd(se_cmd);
2463                 return;
2464         }
2465         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2466                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2467                 complete(&se_cmd->cmd_wait_comp);
2468                 return;
2469         }
2470         list_del(&se_cmd->se_cmd_list);
2471         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2472
2473         se_cmd->se_tfo->release_cmd(se_cmd);
2474 }
2475
2476 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2477  * @se_sess:    session to reference
2478  * @se_cmd:     command descriptor to drop
2479  */
2480 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2481 {
2482         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2483 }
2484 EXPORT_SYMBOL(target_put_sess_cmd);
2485
2486 /* target_sess_cmd_list_set_waiting - Flag all commands in
2487  *         sess_cmd_list to complete cmd_wait_comp.  Set
2488  *         sess_tearing_down so no more commands are queued.
2489  * @se_sess:    session to flag
2490  */
2491 void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2492 {
2493         struct se_cmd *se_cmd;
2494         unsigned long flags;
2495
2496         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2497
2498         WARN_ON(se_sess->sess_tearing_down);
2499         se_sess->sess_tearing_down = 1;
2500
2501         list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2502                 se_cmd->cmd_wait_set = 1;
2503
2504         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2505 }
2506 EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2507
2508 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
2509  * @se_sess:    session to wait for active I/O
2510  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2511  */
2512 void target_wait_for_sess_cmds(
2513         struct se_session *se_sess,
2514         int wait_for_tasks)
2515 {
2516         struct se_cmd *se_cmd, *tmp_cmd;
2517         bool rc = false;
2518
2519         list_for_each_entry_safe(se_cmd, tmp_cmd,
2520                                 &se_sess->sess_cmd_list, se_cmd_list) {
2521                 list_del(&se_cmd->se_cmd_list);
2522
2523                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2524                         " %d\n", se_cmd, se_cmd->t_state,
2525                         se_cmd->se_tfo->get_cmd_state(se_cmd));
2526
2527                 if (wait_for_tasks) {
2528                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2529                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2530                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2531
2532                         rc = transport_wait_for_tasks(se_cmd);
2533
2534                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2535                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2536                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2537                 }
2538
2539                 if (!rc) {
2540                         wait_for_completion(&se_cmd->cmd_wait_comp);
2541                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2542                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2543                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
2544                 }
2545
2546                 se_cmd->se_tfo->release_cmd(se_cmd);
2547         }
2548 }
2549 EXPORT_SYMBOL(target_wait_for_sess_cmds);
2550
2551 /*      transport_lun_wait_for_tasks():
2552  *
2553  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2554  *      an struct se_lun to be successfully shutdown.
2555  */
2556 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2557 {
2558         unsigned long flags;
2559         int ret = 0;
2560
2561         /*
2562          * If the frontend has already requested this struct se_cmd to
2563          * be stopped, we can safely ignore this struct se_cmd.
2564          */
2565         spin_lock_irqsave(&cmd->t_state_lock, flags);
2566         if (cmd->transport_state & CMD_T_STOP) {
2567                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2568
2569                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2570                          cmd->se_tfo->get_task_tag(cmd));
2571                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2572                 transport_cmd_check_stop(cmd, false);
2573                 return -EPERM;
2574         }
2575         cmd->transport_state |= CMD_T_LUN_FE_STOP;
2576         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2577
2578         // XXX: audit task_flags checks.
2579         spin_lock_irqsave(&cmd->t_state_lock, flags);
2580         if ((cmd->transport_state & CMD_T_BUSY) &&
2581             (cmd->transport_state & CMD_T_SENT)) {
2582                 if (!target_stop_cmd(cmd, &flags))
2583                         ret++;
2584         }
2585         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2586
2587         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2588                         " %d\n", cmd, ret);
2589         if (!ret) {
2590                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2591                                 cmd->se_tfo->get_task_tag(cmd));
2592                 wait_for_completion(&cmd->transport_lun_stop_comp);
2593                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2594                                 cmd->se_tfo->get_task_tag(cmd));
2595         }
2596
2597         return 0;
2598 }
2599
2600 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2601 {
2602         struct se_cmd *cmd = NULL;
2603         unsigned long lun_flags, cmd_flags;
2604         /*
2605          * Do exception processing and return CHECK_CONDITION status to the
2606          * Initiator Port.
2607          */
2608         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2609         while (!list_empty(&lun->lun_cmd_list)) {
2610                 cmd = list_first_entry(&lun->lun_cmd_list,
2611                        struct se_cmd, se_lun_node);
2612                 list_del_init(&cmd->se_lun_node);
2613
2614                 spin_lock(&cmd->t_state_lock);
2615                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
2616                         "_lun_stop for  ITT: 0x%08x\n",
2617                         cmd->se_lun->unpacked_lun,
2618                         cmd->se_tfo->get_task_tag(cmd));
2619                 cmd->transport_state |= CMD_T_LUN_STOP;
2620                 spin_unlock(&cmd->t_state_lock);
2621
2622                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2623
2624                 if (!cmd->se_lun) {
2625                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2626                                 cmd->se_tfo->get_task_tag(cmd),
2627                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2628                         BUG();
2629                 }
2630                 /*
2631                  * If the Storage engine still owns the iscsi_cmd_t, determine
2632                  * and/or stop its context.
2633                  */
2634                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2635                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2636                         cmd->se_tfo->get_task_tag(cmd));
2637
2638                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2639                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2640                         continue;
2641                 }
2642
2643                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2644                         "_wait_for_tasks(): SUCCESS\n",
2645                         cmd->se_lun->unpacked_lun,
2646                         cmd->se_tfo->get_task_tag(cmd));
2647
2648                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2649                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2650                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2651                         goto check_cond;
2652                 }
2653                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2654                 target_remove_from_state_list(cmd);
2655                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2656
2657                 /*
2658                  * The Storage engine stopped this struct se_cmd before it was
2659                  * send to the fabric frontend for delivery back to the
2660                  * Initiator Node.  Return this SCSI CDB back with an
2661                  * CHECK_CONDITION status.
2662                  */
2663 check_cond:
2664                 transport_send_check_condition_and_sense(cmd,
2665                                 TCM_NON_EXISTENT_LUN, 0);
2666                 /*
2667                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
2668                  * be released, notify the waiting thread now that LU has
2669                  * finished accessing it.
2670                  */
2671                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2672                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2673                         pr_debug("SE_LUN[%d] - Detected FE stop for"
2674                                 " struct se_cmd: %p ITT: 0x%08x\n",
2675                                 lun->unpacked_lun,
2676                                 cmd, cmd->se_tfo->get_task_tag(cmd));
2677
2678                         spin_unlock_irqrestore(&cmd->t_state_lock,
2679                                         cmd_flags);
2680                         transport_cmd_check_stop(cmd, false);
2681                         complete(&cmd->transport_lun_fe_stop_comp);
2682                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2683                         continue;
2684                 }
2685                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2686                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2687
2688                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2689                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2690         }
2691         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2692 }
2693
2694 static int transport_clear_lun_thread(void *p)
2695 {
2696         struct se_lun *lun = p;
2697
2698         __transport_clear_lun_from_sessions(lun);
2699         complete(&lun->lun_shutdown_comp);
2700
2701         return 0;
2702 }
2703
2704 int transport_clear_lun_from_sessions(struct se_lun *lun)
2705 {
2706         struct task_struct *kt;
2707
2708         kt = kthread_run(transport_clear_lun_thread, lun,
2709                         "tcm_cl_%u", lun->unpacked_lun);
2710         if (IS_ERR(kt)) {
2711                 pr_err("Unable to start clear_lun thread\n");
2712                 return PTR_ERR(kt);
2713         }
2714         wait_for_completion(&lun->lun_shutdown_comp);
2715
2716         return 0;
2717 }
2718
2719 /**
2720  * transport_wait_for_tasks - wait for completion to occur
2721  * @cmd:        command to wait
2722  *
2723  * Called from frontend fabric context to wait for storage engine
2724  * to pause and/or release frontend generated struct se_cmd.
2725  */
2726 bool transport_wait_for_tasks(struct se_cmd *cmd)
2727 {
2728         unsigned long flags;
2729
2730         spin_lock_irqsave(&cmd->t_state_lock, flags);
2731         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2732             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2733                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2734                 return false;
2735         }
2736
2737         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2738             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2739                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2740                 return false;
2741         }
2742         /*
2743          * If we are already stopped due to an external event (ie: LUN shutdown)
2744          * sleep until the connection can have the passed struct se_cmd back.
2745          * The cmd->transport_lun_stopped_sem will be upped by
2746          * transport_clear_lun_from_sessions() once the ConfigFS context caller
2747          * has completed its operation on the struct se_cmd.
2748          */
2749         if (cmd->transport_state & CMD_T_LUN_STOP) {
2750                 pr_debug("wait_for_tasks: Stopping"
2751                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2752                         "_stop_comp); for ITT: 0x%08x\n",
2753                         cmd->se_tfo->get_task_tag(cmd));
2754                 /*
2755                  * There is a special case for WRITES where a FE exception +
2756                  * LUN shutdown means ConfigFS context is still sleeping on
2757                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2758                  * We go ahead and up transport_lun_stop_comp just to be sure
2759                  * here.
2760                  */
2761                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2762                 complete(&cmd->transport_lun_stop_comp);
2763                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2764                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2765
2766                 target_remove_from_state_list(cmd);
2767                 /*
2768                  * At this point, the frontend who was the originator of this
2769                  * struct se_cmd, now owns the structure and can be released through
2770                  * normal means below.
2771                  */
2772                 pr_debug("wait_for_tasks: Stopped"
2773                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2774                         "stop_comp); for ITT: 0x%08x\n",
2775                         cmd->se_tfo->get_task_tag(cmd));
2776
2777                 cmd->transport_state &= ~CMD_T_LUN_STOP;
2778         }
2779
2780         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2781                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2782                 return false;
2783         }
2784
2785         cmd->transport_state |= CMD_T_STOP;
2786
2787         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2788                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
2789                 cmd, cmd->se_tfo->get_task_tag(cmd),
2790                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2791
2792         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2793
2794         wait_for_completion(&cmd->t_transport_stop_comp);
2795
2796         spin_lock_irqsave(&cmd->t_state_lock, flags);
2797         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2798
2799         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
2800                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2801                 cmd->se_tfo->get_task_tag(cmd));
2802
2803         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2804
2805         return true;
2806 }
2807 EXPORT_SYMBOL(transport_wait_for_tasks);
2808
2809 static int transport_get_sense_codes(
2810         struct se_cmd *cmd,
2811         u8 *asc,
2812         u8 *ascq)
2813 {
2814         *asc = cmd->scsi_asc;
2815         *ascq = cmd->scsi_ascq;
2816
2817         return 0;
2818 }
2819
2820 static int transport_set_sense_codes(
2821         struct se_cmd *cmd,
2822         u8 asc,
2823         u8 ascq)
2824 {
2825         cmd->scsi_asc = asc;
2826         cmd->scsi_ascq = ascq;
2827
2828         return 0;
2829 }
2830
2831 int transport_send_check_condition_and_sense(
2832         struct se_cmd *cmd,
2833         u8 reason,
2834         int from_transport)
2835 {
2836         unsigned char *buffer = cmd->sense_buffer;
2837         unsigned long flags;
2838         int offset;
2839         u8 asc = 0, ascq = 0;
2840
2841         spin_lock_irqsave(&cmd->t_state_lock, flags);
2842         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2843                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2844                 return 0;
2845         }
2846         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2847         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2848
2849         if (!reason && from_transport)
2850                 goto after_reason;
2851
2852         if (!from_transport)
2853                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2854         /*
2855          * Data Segment and SenseLength of the fabric response PDU.
2856          *
2857          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
2858          * from include/scsi/scsi_cmnd.h
2859          */
2860         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2861                                 TRANSPORT_SENSE_BUFFER);
2862         /*
2863          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2864          * SENSE KEY values from include/scsi/scsi.h
2865          */
2866         switch (reason) {
2867         case TCM_NON_EXISTENT_LUN:
2868                 /* CURRENT ERROR */
2869                 buffer[offset] = 0x70;
2870                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2871                 /* ILLEGAL REQUEST */
2872                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2873                 /* LOGICAL UNIT NOT SUPPORTED */
2874                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
2875                 break;
2876         case TCM_UNSUPPORTED_SCSI_OPCODE:
2877         case TCM_SECTOR_COUNT_TOO_MANY:
2878                 /* CURRENT ERROR */
2879                 buffer[offset] = 0x70;
2880                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2881                 /* ILLEGAL REQUEST */
2882                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2883                 /* INVALID COMMAND OPERATION CODE */
2884                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
2885                 break;
2886         case TCM_UNKNOWN_MODE_PAGE:
2887                 /* CURRENT ERROR */
2888                 buffer[offset] = 0x70;
2889                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2890                 /* ILLEGAL REQUEST */
2891                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2892                 /* INVALID FIELD IN CDB */
2893                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2894                 break;
2895         case TCM_CHECK_CONDITION_ABORT_CMD:
2896                 /* CURRENT ERROR */
2897                 buffer[offset] = 0x70;
2898                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2899                 /* ABORTED COMMAND */
2900                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2901                 /* BUS DEVICE RESET FUNCTION OCCURRED */
2902                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
2903                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
2904                 break;
2905         case TCM_INCORRECT_AMOUNT_OF_DATA:
2906                 /* CURRENT ERROR */
2907                 buffer[offset] = 0x70;
2908                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2909                 /* ABORTED COMMAND */
2910                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2911                 /* WRITE ERROR */
2912                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2913                 /* NOT ENOUGH UNSOLICITED DATA */
2914                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
2915                 break;
2916         case TCM_INVALID_CDB_FIELD:
2917                 /* CURRENT ERROR */
2918                 buffer[offset] = 0x70;
2919                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2920                 /* ILLEGAL REQUEST */
2921                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2922                 /* INVALID FIELD IN CDB */
2923                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
2924                 break;
2925         case TCM_INVALID_PARAMETER_LIST:
2926                 /* CURRENT ERROR */
2927                 buffer[offset] = 0x70;
2928                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2929                 /* ILLEGAL REQUEST */
2930                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2931                 /* INVALID FIELD IN PARAMETER LIST */
2932                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
2933                 break;
2934         case TCM_UNEXPECTED_UNSOLICITED_DATA:
2935                 /* CURRENT ERROR */
2936                 buffer[offset] = 0x70;
2937                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2938                 /* ABORTED COMMAND */
2939                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2940                 /* WRITE ERROR */
2941                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
2942                 /* UNEXPECTED_UNSOLICITED_DATA */
2943                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
2944                 break;
2945         case TCM_SERVICE_CRC_ERROR:
2946                 /* CURRENT ERROR */
2947                 buffer[offset] = 0x70;
2948                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2949                 /* ABORTED COMMAND */
2950                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2951                 /* PROTOCOL SERVICE CRC ERROR */
2952                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
2953                 /* N/A */
2954                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
2955                 break;
2956         case TCM_SNACK_REJECTED:
2957                 /* CURRENT ERROR */
2958                 buffer[offset] = 0x70;
2959                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2960                 /* ABORTED COMMAND */
2961                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2962                 /* READ ERROR */
2963                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
2964                 /* FAILED RETRANSMISSION REQUEST */
2965                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
2966                 break;
2967         case TCM_WRITE_PROTECTED:
2968                 /* CURRENT ERROR */
2969                 buffer[offset] = 0x70;
2970                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2971                 /* DATA PROTECT */
2972                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2973                 /* WRITE PROTECTED */
2974                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
2975                 break;
2976         case TCM_ADDRESS_OUT_OF_RANGE:
2977                 /* CURRENT ERROR */
2978                 buffer[offset] = 0x70;
2979                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2980                 /* ILLEGAL REQUEST */
2981                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2982                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2983                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
2984                 break;
2985         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2986                 /* CURRENT ERROR */
2987                 buffer[offset] = 0x70;
2988                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2989                 /* UNIT ATTENTION */
2990                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
2991                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
2992                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
2993                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
2994                 break;
2995         case TCM_CHECK_CONDITION_NOT_READY:
2996                 /* CURRENT ERROR */
2997                 buffer[offset] = 0x70;
2998                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
2999                 /* Not Ready */
3000                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
3001                 transport_get_sense_codes(cmd, &asc, &ascq);
3002                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
3003                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
3004                 break;
3005         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3006         default:
3007                 /* CURRENT ERROR */
3008                 buffer[offset] = 0x70;
3009                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
3010                 /* ILLEGAL REQUEST */
3011                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3012                 /* LOGICAL UNIT COMMUNICATION FAILURE */
3013                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
3014                 break;
3015         }
3016         /*
3017          * This code uses linux/include/scsi/scsi.h SAM status codes!
3018          */
3019         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3020         /*
3021          * Automatically padded, this value is encoded in the fabric's
3022          * data_length response PDU containing the SCSI defined sense data.
3023          */
3024         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
3025
3026 after_reason:
3027         return cmd->se_tfo->queue_status(cmd);
3028 }
3029 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3030
3031 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3032 {
3033         int ret = 0;
3034
3035         if (cmd->transport_state & CMD_T_ABORTED) {
3036                 if (!send_status ||
3037                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3038                         return 1;
3039
3040                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3041                         " status for CDB: 0x%02x ITT: 0x%08x\n",
3042                         cmd->t_task_cdb[0],
3043                         cmd->se_tfo->get_task_tag(cmd));
3044
3045                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3046                 cmd->se_tfo->queue_status(cmd);
3047                 ret = 1;
3048         }
3049         return ret;
3050 }
3051 EXPORT_SYMBOL(transport_check_aborted_status);
3052
3053 void transport_send_task_abort(struct se_cmd *cmd)
3054 {
3055         unsigned long flags;
3056
3057         spin_lock_irqsave(&cmd->t_state_lock, flags);
3058         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
3059                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3060                 return;
3061         }
3062         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3063
3064         /*
3065          * If there are still expected incoming fabric WRITEs, we wait
3066          * until until they have completed before sending a TASK_ABORTED
3067          * response.  This response with TASK_ABORTED status will be
3068          * queued back to fabric module by transport_check_aborted_status().
3069          */
3070         if (cmd->data_direction == DMA_TO_DEVICE) {
3071                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3072                         cmd->transport_state |= CMD_T_ABORTED;
3073                         smp_mb__after_atomic_inc();
3074                 }
3075         }
3076         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3077
3078         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3079                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3080                 cmd->se_tfo->get_task_tag(cmd));
3081
3082         cmd->se_tfo->queue_status(cmd);
3083 }
3084
3085 static void target_tmr_work(struct work_struct *work)
3086 {
3087         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3088         struct se_device *dev = cmd->se_dev;
3089         struct se_tmr_req *tmr = cmd->se_tmr_req;
3090         int ret;
3091
3092         switch (tmr->function) {
3093         case TMR_ABORT_TASK:
3094                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
3095                 break;
3096         case TMR_ABORT_TASK_SET:
3097         case TMR_CLEAR_ACA:
3098         case TMR_CLEAR_TASK_SET:
3099                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3100                 break;
3101         case TMR_LUN_RESET:
3102                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3103                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3104                                          TMR_FUNCTION_REJECTED;
3105                 break;
3106         case TMR_TARGET_WARM_RESET:
3107                 tmr->response = TMR_FUNCTION_REJECTED;
3108                 break;
3109         case TMR_TARGET_COLD_RESET:
3110                 tmr->response = TMR_FUNCTION_REJECTED;
3111                 break;
3112         default:
3113                 pr_err("Uknown TMR function: 0x%02x.\n",
3114                                 tmr->function);
3115                 tmr->response = TMR_FUNCTION_REJECTED;
3116                 break;
3117         }
3118
3119         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3120         cmd->se_tfo->queue_tm_rsp(cmd);
3121
3122         transport_cmd_check_stop_to_fabric(cmd);
3123 }
3124
3125 int transport_generic_handle_tmr(
3126         struct se_cmd *cmd)
3127 {
3128         INIT_WORK(&cmd->work, target_tmr_work);
3129         queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3130         return 0;
3131 }
3132 EXPORT_SYMBOL(transport_generic_handle_tmr);