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/version.h>
  30 #include <linux/net.h>
  31 #include <linux/delay.h>
  32 #include <linux/string.h>
  33 #include <linux/timer.h>
  34 #include <linux/slab.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/kthread.h>
  38 #include <linux/in.h>
  39 #include <linux/cdrom.h>
  40 #include <asm/unaligned.h>
  41 #include <net/sock.h>
  42 #include <net/tcp.h>
  43 #include <scsi/scsi.h>
  44 #include <scsi/scsi_cmnd.h>
  45 #include <scsi/scsi_tcq.h>
  46
  47 #include <target/target_core_base.h>
  48 #include <target/target_core_device.h>
  49 #include <target/target_core_tmr.h>
  50 #include <target/target_core_tpg.h>
  51 #include <target/target_core_transport.h>
  52 #include <target/target_core_fabric_ops.h>
  53 #include <target/target_core_configfs.h>
  54
  55 #include "target_core_alua.h"
  56 #include "target_core_hba.h"
  57 #include "target_core_pr.h"
  58 #include "target_core_scdb.h"
  59 #include "target_core_ua.h"
  60
  61 static int sub_api_initialized;
  62
  63 static struct kmem_cache *se_cmd_cache;
  64 static struct kmem_cache *se_sess_cache;
  65 struct kmem_cache *se_tmr_req_cache;
  66 struct kmem_cache *se_ua_cache;
  67 struct kmem_cache *t10_pr_reg_cache;
  68 struct kmem_cache *t10_alua_lu_gp_cache;
  69 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  70 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  71 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  72
  73 /* Used for transport_dev_get_map_*() */
  74 typedef int (*map_func_t)(struct se_task *, u32);
  75
  76 static int transport_generic_write_pending(struct se_cmd *);
  77 static int transport_processing_thread(void *param);
  78 static int __transport_execute_tasks(struct se_device *dev);
  79 static void transport_complete_task_attr(struct se_cmd *cmd);
  80 static int transport_complete_qf(struct se_cmd *cmd);
  81 static void transport_handle_queue_full(struct se_cmd *cmd,
  82                 struct se_device *dev, int (*qf_callback)(struct se_cmd *));
  83 static void transport_direct_request_timeout(struct se_cmd *cmd);
  84 static void transport_free_dev_tasks(struct se_cmd *cmd);
  85 static u32 transport_allocate_tasks(struct se_cmd *cmd,
  86                 unsigned long long starting_lba,
  87                 enum dma_data_direction data_direction,
  88                 struct scatterlist *sgl, unsigned int nents);
  89 static int transport_generic_get_mem(struct se_cmd *cmd);
  90 static int transport_generic_remove(struct se_cmd *cmd,
  91                 int session_reinstatement);
  92 static void transport_release_fe_cmd(struct se_cmd *cmd);
  93 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
  94                 struct se_queue_obj *qobj);
  95 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  96 static void transport_stop_all_task_timers(struct se_cmd *cmd);
  97
  98 int init_se_kmem_caches(void)
  99 {
 100         se_cmd_cache = kmem_cache_create("se_cmd_cache",
 101                         sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
 102         if (!se_cmd_cache) {
 103                 pr_err("kmem_cache_create for struct se_cmd failed\n");
 104                 goto out;
 105         }
 106         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
 107                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
 108                         0, NULL);
 109         if (!se_tmr_req_cache) {
 110                 pr_err("kmem_cache_create() for struct se_tmr_req"
 111                                 " failed\n");
 112                 goto out;
 113         }
 114         se_sess_cache = kmem_cache_create("se_sess_cache",
 115                         sizeof(struct se_session), __alignof__(struct se_session),
 116                         0, NULL);
 117         if (!se_sess_cache) {
 118                 pr_err("kmem_cache_create() for struct se_session"
 119                                 " failed\n");
 120                 goto out;
 121         }
 122         se_ua_cache = kmem_cache_create("se_ua_cache",
 123                         sizeof(struct se_ua), __alignof__(struct se_ua),
 124                         0, NULL);
 125         if (!se_ua_cache) {
 126                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 127                 goto out;
 128         }
 129         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 130                         sizeof(struct t10_pr_registration),
 131                         __alignof__(struct t10_pr_registration), 0, NULL);
 132         if (!t10_pr_reg_cache) {
 133                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 134                                 " failed\n");
 135                 goto out;
 136         }
 137         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 138                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 139                         0, NULL);
 140         if (!t10_alua_lu_gp_cache) {
 141                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 142                                 " failed\n");
 143                 goto out;
 144         }
 145         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 146                         sizeof(struct t10_alua_lu_gp_member),
 147                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 148         if (!t10_alua_lu_gp_mem_cache) {
 149                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 150                                 "cache failed\n");
 151                 goto out;
 152         }
 153         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 154                         sizeof(struct t10_alua_tg_pt_gp),
 155                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 156         if (!t10_alua_tg_pt_gp_cache) {
 157                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 158                                 "cache failed\n");
 159                 goto out;
 160         }
 161         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 162                         "t10_alua_tg_pt_gp_mem_cache",
 163                         sizeof(struct t10_alua_tg_pt_gp_member),
 164                         __alignof__(struct t10_alua_tg_pt_gp_member),
 165                         0, NULL);
 166         if (!t10_alua_tg_pt_gp_mem_cache) {
 167                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 168                                 "mem_t failed\n");
 169                 goto out;
 170         }
 171
 172         return 0;
 173 out:
 174         if (se_cmd_cache)
 175                 kmem_cache_destroy(se_cmd_cache);
 176         if (se_tmr_req_cache)
 177                 kmem_cache_destroy(se_tmr_req_cache);
 178         if (se_sess_cache)
 179                 kmem_cache_destroy(se_sess_cache);
 180         if (se_ua_cache)
 181                 kmem_cache_destroy(se_ua_cache);
 182         if (t10_pr_reg_cache)
 183                 kmem_cache_destroy(t10_pr_reg_cache);
 184         if (t10_alua_lu_gp_cache)
 185                 kmem_cache_destroy(t10_alua_lu_gp_cache);
 186         if (t10_alua_lu_gp_mem_cache)
 187                 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 188         if (t10_alua_tg_pt_gp_cache)
 189                 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 190         if (t10_alua_tg_pt_gp_mem_cache)
 191                 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 192         return -ENOMEM;
 193 }
 194
 195 void release_se_kmem_caches(void)
 196 {
 197         kmem_cache_destroy(se_cmd_cache);
 198         kmem_cache_destroy(se_tmr_req_cache);
 199         kmem_cache_destroy(se_sess_cache);
 200         kmem_cache_destroy(se_ua_cache);
 201         kmem_cache_destroy(t10_pr_reg_cache);
 202         kmem_cache_destroy(t10_alua_lu_gp_cache);
 203         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 204         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 205         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 206 }
 207
 208 /* This code ensures unique mib indexes are handed out. */
 209 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 210 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 211
 212 /*
 213  * Allocate a new row index for the entry type specified
 214  */
 215 u32 scsi_get_new_index(scsi_index_t type)
 216 {
 217         u32 new_index;
 218
 219         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 220
 221         spin_lock(&scsi_mib_index_lock);
 222         new_index = ++scsi_mib_index[type];
 223         spin_unlock(&scsi_mib_index_lock);
 224
 225         return new_index;
 226 }
 227
 228 void transport_init_queue_obj(struct se_queue_obj *qobj)
 229 {
 230         atomic_set(&qobj->queue_cnt, 0);
 231         INIT_LIST_HEAD(&qobj->qobj_list);
 232         init_waitqueue_head(&qobj->thread_wq);
 233         spin_lock_init(&qobj->cmd_queue_lock);
 234 }
 235 EXPORT_SYMBOL(transport_init_queue_obj);
 236
 237 static int transport_subsystem_reqmods(void)
 238 {
 239         int ret;
 240
 241         ret = request_module("target_core_iblock");
 242         if (ret != 0)
 243                 pr_err("Unable to load target_core_iblock\n");
 244
 245         ret = request_module("target_core_file");
 246         if (ret != 0)
 247                 pr_err("Unable to load target_core_file\n");
 248
 249         ret = request_module("target_core_pscsi");
 250         if (ret != 0)
 251                 pr_err("Unable to load target_core_pscsi\n");
 252
 253         ret = request_module("target_core_stgt");
 254         if (ret != 0)
 255                 pr_err("Unable to load target_core_stgt\n");
 256
 257         return 0;
 258 }
 259
 260 int transport_subsystem_check_init(void)
 261 {
 262         int ret;
 263
 264         if (sub_api_initialized)
 265                 return 0;
 266         /*
 267          * Request the loading of known TCM subsystem plugins..
 268          */
 269         ret = transport_subsystem_reqmods();
 270         if (ret < 0)
 271                 return ret;
 272
 273         sub_api_initialized = 1;
 274         return 0;
 275 }
 276
 277 struct se_session *transport_init_session(void)
 278 {
 279         struct se_session *se_sess;
 280
 281         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 282         if (!se_sess) {
 283                 pr_err("Unable to allocate struct se_session from"
 284                                 " se_sess_cache\n");
 285                 return ERR_PTR(-ENOMEM);
 286         }
 287         INIT_LIST_HEAD(&se_sess->sess_list);
 288         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 289
 290         return se_sess;
 291 }
 292 EXPORT_SYMBOL(transport_init_session);
 293
 294 /*
 295  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 296  */
 297 void __transport_register_session(
 298         struct se_portal_group *se_tpg,
 299         struct se_node_acl *se_nacl,
 300         struct se_session *se_sess,
 301         void *fabric_sess_ptr)
 302 {
 303         unsigned char buf[PR_REG_ISID_LEN];
 304
 305         se_sess->se_tpg = se_tpg;
 306         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 307         /*
 308          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 309          *
 310          * Only set for struct se_session's that will actually be moving I/O.
 311          * eg: *NOT* discovery sessions.
 312          */
 313         if (se_nacl) {
 314                 /*
 315                  * If the fabric module supports an ISID based TransportID,
 316                  * save this value in binary from the fabric I_T Nexus now.
 317                  */
 318                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 319                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 320                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 321                                         &buf[0], PR_REG_ISID_LEN);
 322                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 323                 }
 324                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 325                 /*
 326                  * The se_nacl->nacl_sess pointer will be set to the
 327                  * last active I_T Nexus for each struct se_node_acl.
 328                  */
 329                 se_nacl->nacl_sess = se_sess;
 330
 331                 list_add_tail(&se_sess->sess_acl_list,
 332                               &se_nacl->acl_sess_list);
 333                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 334         }
 335         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 336
 337         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 338                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 339 }
 340 EXPORT_SYMBOL(__transport_register_session);
 341
 342 void transport_register_session(
 343         struct se_portal_group *se_tpg,
 344         struct se_node_acl *se_nacl,
 345         struct se_session *se_sess,
 346         void *fabric_sess_ptr)
 347 {
 348         spin_lock_bh(&se_tpg->session_lock);
 349         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 350         spin_unlock_bh(&se_tpg->session_lock);
 351 }
 352 EXPORT_SYMBOL(transport_register_session);
 353
 354 void transport_deregister_session_configfs(struct se_session *se_sess)
 355 {
 356         struct se_node_acl *se_nacl;
 357         unsigned long flags;
 358         /*
 359          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 360          */
 361         se_nacl = se_sess->se_node_acl;
 362         if (se_nacl) {
 363                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 364                 list_del(&se_sess->sess_acl_list);
 365                 /*
 366                  * If the session list is empty, then clear the pointer.
 367                  * Otherwise, set the struct se_session pointer from the tail
 368                  * element of the per struct se_node_acl active session list.
 369                  */
 370                 if (list_empty(&se_nacl->acl_sess_list))
 371                         se_nacl->nacl_sess = NULL;
 372                 else {
 373                         se_nacl->nacl_sess = container_of(
 374                                         se_nacl->acl_sess_list.prev,
 375                                         struct se_session, sess_acl_list);
 376                 }
 377                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 378         }
 379 }
 380 EXPORT_SYMBOL(transport_deregister_session_configfs);
 381
 382 void transport_free_session(struct se_session *se_sess)
 383 {
 384         kmem_cache_free(se_sess_cache, se_sess);
 385 }
 386 EXPORT_SYMBOL(transport_free_session);
 387
 388 void transport_deregister_session(struct se_session *se_sess)
 389 {
 390         struct se_portal_group *se_tpg = se_sess->se_tpg;
 391         struct se_node_acl *se_nacl;
 392
 393         if (!se_tpg) {
 394                 transport_free_session(se_sess);
 395                 return;
 396         }
 397
 398         spin_lock_bh(&se_tpg->session_lock);
 399         list_del(&se_sess->sess_list);
 400         se_sess->se_tpg = NULL;
 401         se_sess->fabric_sess_ptr = NULL;
 402         spin_unlock_bh(&se_tpg->session_lock);
 403
 404         /*
 405          * Determine if we need to do extra work for this initiator node's
 406          * struct se_node_acl if it had been previously dynamically generated.
 407          */
 408         se_nacl = se_sess->se_node_acl;
 409         if (se_nacl) {
 410                 spin_lock_bh(&se_tpg->acl_node_lock);
 411                 if (se_nacl->dynamic_node_acl) {
 412                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 413                                         se_tpg)) {
 414                                 list_del(&se_nacl->acl_list);
 415                                 se_tpg->num_node_acls--;
 416                                 spin_unlock_bh(&se_tpg->acl_node_lock);
 417
 418                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 419                                 core_free_device_list_for_node(se_nacl, se_tpg);
 420                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 421                                                 se_nacl);
 422                                 spin_lock_bh(&se_tpg->acl_node_lock);
 423                         }
 424                 }
 425                 spin_unlock_bh(&se_tpg->acl_node_lock);
 426         }
 427
 428         transport_free_session(se_sess);
 429
 430         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 431                 se_tpg->se_tpg_tfo->get_fabric_name());
 432 }
 433 EXPORT_SYMBOL(transport_deregister_session);
 434
 435 /*
 436  * Called with cmd->t_state_lock held.
 437  */
 438 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 439 {
 440         struct se_device *dev;
 441         struct se_task *task;
 442         unsigned long flags;
 443
 444         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 445                 dev = task->se_dev;
 446                 if (!dev)
 447                         continue;
 448
 449                 if (atomic_read(&task->task_active))
 450                         continue;
 451
 452                 if (!atomic_read(&task->task_state_active))
 453                         continue;
 454
 455                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 456                 list_del(&task->t_state_list);
 457                 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 458                         cmd->se_tfo->get_task_tag(cmd), dev, task);
 459                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 460
 461                 atomic_set(&task->task_state_active, 0);
 462                 atomic_dec(&cmd->t_task_cdbs_ex_left);
 463         }
 464 }
 465
 466 /*      transport_cmd_check_stop():
 467  *
 468  *      'transport_off = 1' determines if t_transport_active should be cleared.
 469  *      'transport_off = 2' determines if task_dev_state should be removed.
 470  *
 471  *      A non-zero u8 t_state sets cmd->t_state.
 472  *      Returns 1 when command is stopped, else 0.
 473  */
 474 static int transport_cmd_check_stop(
 475         struct se_cmd *cmd,
 476         int transport_off,
 477         u8 t_state)
 478 {
 479         unsigned long flags;
 480
 481         spin_lock_irqsave(&cmd->t_state_lock, flags);
 482         /*
 483          * Determine if IOCTL context caller in requesting the stopping of this
 484          * command for LUN shutdown purposes.
 485          */
 486         if (atomic_read(&cmd->transport_lun_stop)) {
 487                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 488                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 489                         cmd->se_tfo->get_task_tag(cmd));
 490
 491                 cmd->deferred_t_state = cmd->t_state;
 492                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
 493                 atomic_set(&cmd->t_transport_active, 0);
 494                 if (transport_off == 2)
 495                         transport_all_task_dev_remove_state(cmd);
 496                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 497
 498                 complete(&cmd->transport_lun_stop_comp);
 499                 return 1;
 500         }
 501         /*
 502          * Determine if frontend context caller is requesting the stopping of
 503          * this command for frontend exceptions.
 504          */
 505         if (atomic_read(&cmd->t_transport_stop)) {
 506                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 507                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 508                         cmd->se_tfo->get_task_tag(cmd));
 509
 510                 cmd->deferred_t_state = cmd->t_state;
 511                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
 512                 if (transport_off == 2)
 513                         transport_all_task_dev_remove_state(cmd);
 514
 515                 /*
 516                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 517                  * to FE.
 518                  */
 519                 if (transport_off == 2)
 520                         cmd->se_lun = NULL;
 521                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 522
 523                 complete(&cmd->t_transport_stop_comp);
 524                 return 1;
 525         }
 526         if (transport_off) {
 527                 atomic_set(&cmd->t_transport_active, 0);
 528                 if (transport_off == 2) {
 529                         transport_all_task_dev_remove_state(cmd);
 530                         /*
 531                          * Clear struct se_cmd->se_lun before the transport_off == 2
 532                          * handoff to fabric module.
 533                          */
 534                         cmd->se_lun = NULL;
 535                         /*
 536                          * Some fabric modules like tcm_loop can release
 537                          * their internally allocated I/O reference now and
 538                          * struct se_cmd now.
 539                          */
 540                         if (cmd->se_tfo->check_stop_free != NULL) {
 541                                 spin_unlock_irqrestore(
 542                                         &cmd->t_state_lock, flags);
 543
 544                                 cmd->se_tfo->check_stop_free(cmd);
 545                                 return 1;
 546                         }
 547                 }
 548                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 549
 550                 return 0;
 551         } else if (t_state)
 552                 cmd->t_state = t_state;
 553         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 554
 555         return 0;
 556 }
 557
 558 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 559 {
 560         return transport_cmd_check_stop(cmd, 2, 0);
 561 }
 562
 563 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 564 {
 565         struct se_lun *lun = cmd->se_lun;
 566         unsigned long flags;
 567
 568         if (!lun)
 569                 return;
 570
 571         spin_lock_irqsave(&cmd->t_state_lock, flags);
 572         if (!atomic_read(&cmd->transport_dev_active)) {
 573                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 574                 goto check_lun;
 575         }
 576         atomic_set(&cmd->transport_dev_active, 0);
 577         transport_all_task_dev_remove_state(cmd);
 578         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 579
 580
 581 check_lun:
 582         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 583         if (atomic_read(&cmd->transport_lun_active)) {
 584                 list_del(&cmd->se_lun_node);
 585                 atomic_set(&cmd->transport_lun_active, 0);
 586 #if 0
 587                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 588                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 589 #endif
 590         }
 591         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 592 }
 593
 594 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 595 {
 596         transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
 597         transport_lun_remove_cmd(cmd);
 598
 599         if (transport_cmd_check_stop_to_fabric(cmd))
 600                 return;
 601         if (remove)
 602                 transport_generic_remove(cmd, 0);
 603 }
 604
 605 void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
 606 {
 607         transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
 608
 609         if (transport_cmd_check_stop_to_fabric(cmd))
 610                 return;
 611
 612         transport_generic_remove(cmd, 0);
 613 }
 614
 615 static void transport_add_cmd_to_queue(
 616         struct se_cmd *cmd,
 617         int t_state)
 618 {
 619         struct se_device *dev = cmd->se_dev;
 620         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 621         unsigned long flags;
 622
 623         INIT_LIST_HEAD(&cmd->se_queue_node);
 624
 625         if (t_state) {
 626                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 627                 cmd->t_state = t_state;
 628                 atomic_set(&cmd->t_transport_active, 1);
 629                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 630         }
 631
 632         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 633         if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
 634                 cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
 635                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 636         } else
 637                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 638         atomic_inc(&cmd->t_transport_queue_active);
 639         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 640
 641         atomic_inc(&qobj->queue_cnt);
 642         wake_up_interruptible(&qobj->thread_wq);
 643 }
 644
 645 static struct se_cmd *
 646 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 647 {
 648         struct se_cmd *cmd;
 649         unsigned long flags;
 650
 651         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 652         if (list_empty(&qobj->qobj_list)) {
 653                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 654                 return NULL;
 655         }
 656         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 657
 658         atomic_dec(&cmd->t_transport_queue_active);
 659
 660         list_del(&cmd->se_queue_node);
 661         atomic_dec(&qobj->queue_cnt);
 662         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 663
 664         return cmd;
 665 }
 666
 667 static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
 668                 struct se_queue_obj *qobj)
 669 {
 670         struct se_cmd *t;
 671         unsigned long flags;
 672
 673         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 674         if (!atomic_read(&cmd->t_transport_queue_active)) {
 675                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 676                 return;
 677         }
 678
 679         list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
 680                 if (t == cmd) {
 681                         atomic_dec(&cmd->t_transport_queue_active);
 682                         atomic_dec(&qobj->queue_cnt);
 683                         list_del(&cmd->se_queue_node);
 684                         break;
 685                 }
 686         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 687
 688         if (atomic_read(&cmd->t_transport_queue_active)) {
 689                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 690                         cmd->se_tfo->get_task_tag(cmd),
 691                         atomic_read(&cmd->t_transport_queue_active));
 692         }
 693 }
 694
 695 /*
 696  * Completion function used by TCM subsystem plugins (such as FILEIO)
 697  * for queueing up response from struct se_subsystem_api->do_task()
 698  */
 699 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 700 {
 701         struct se_task *task = list_entry(cmd->t_task_list.next,
 702                                 struct se_task, t_list);
 703
 704         if (good) {
 705                 cmd->scsi_status = SAM_STAT_GOOD;
 706                 task->task_scsi_status = GOOD;
 707         } else {
 708                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 709                 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
 710                 task->task_se_cmd->transport_error_status =
 711                                         PYX_TRANSPORT_ILLEGAL_REQUEST;
 712         }
 713
 714         transport_complete_task(task, good);
 715 }
 716 EXPORT_SYMBOL(transport_complete_sync_cache);
 717
 718 /*      transport_complete_task():
 719  *
 720  *      Called from interrupt and non interrupt context depending
 721  *      on the transport plugin.
 722  */
 723 void transport_complete_task(struct se_task *task, int success)
 724 {
 725         struct se_cmd *cmd = task->task_se_cmd;
 726         struct se_device *dev = task->se_dev;
 727         int t_state;
 728         unsigned long flags;
 729 #if 0
 730         pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
 731                         cmd->t_task_cdb[0], dev);
 732 #endif
 733         if (dev)
 734                 atomic_inc(&dev->depth_left);
 735
 736         spin_lock_irqsave(&cmd->t_state_lock, flags);
 737         atomic_set(&task->task_active, 0);
 738
 739         /*
 740          * See if any sense data exists, if so set the TASK_SENSE flag.
 741          * Also check for any other post completion work that needs to be
 742          * done by the plugins.
 743          */
 744         if (dev && dev->transport->transport_complete) {
 745                 if (dev->transport->transport_complete(task) != 0) {
 746                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 747                         task->task_sense = 1;
 748                         success = 1;
 749                 }
 750         }
 751
 752         /*
 753          * See if we are waiting for outstanding struct se_task
 754          * to complete for an exception condition
 755          */
 756         if (atomic_read(&task->task_stop)) {
 757                 /*
 758                  * Decrement cmd->t_se_count if this task had
 759                  * previously thrown its timeout exception handler.
 760                  */
 761                 if (atomic_read(&task->task_timeout)) {
 762                         atomic_dec(&cmd->t_se_count);
 763                         atomic_set(&task->task_timeout, 0);
 764                 }
 765                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 766
 767                 complete(&task->task_stop_comp);
 768                 return;
 769         }
 770         /*
 771          * If the task's timeout handler has fired, use the t_task_cdbs_timeout
 772          * left counter to determine when the struct se_cmd is ready to be queued to
 773          * the processing thread.
 774          */
 775         if (atomic_read(&task->task_timeout)) {
 776                 if (!atomic_dec_and_test(
 777                                 &cmd->t_task_cdbs_timeout_left)) {
 778                         spin_unlock_irqrestore(&cmd->t_state_lock,
 779                                 flags);
 780                         return;
 781                 }
 782                 t_state = TRANSPORT_COMPLETE_TIMEOUT;
 783                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 784
 785                 transport_add_cmd_to_queue(cmd, t_state);
 786                 return;
 787         }
 788         atomic_dec(&cmd->t_task_cdbs_timeout_left);
 789
 790         /*
 791          * Decrement the outstanding t_task_cdbs_left count.  The last
 792          * struct se_task from struct se_cmd will complete itself into the
 793          * device queue depending upon int success.
 794          */
 795         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 796                 if (!success)
 797                         cmd->t_tasks_failed = 1;
 798
 799                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 800                 return;
 801         }
 802
 803         if (!success || cmd->t_tasks_failed) {
 804                 t_state = TRANSPORT_COMPLETE_FAILURE;
 805                 if (!task->task_error_status) {
 806                         task->task_error_status =
 807                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 808                         cmd->transport_error_status =
 809                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 810                 }
 811         } else {
 812                 atomic_set(&cmd->t_transport_complete, 1);
 813                 t_state = TRANSPORT_COMPLETE_OK;
 814         }
 815         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 816
 817         transport_add_cmd_to_queue(cmd, t_state);
 818 }
 819 EXPORT_SYMBOL(transport_complete_task);
 820
 821 /*
 822  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 823  * struct se_task list are ready to be added to the active execution list
 824  * struct se_device
 825
 826  * Called with se_dev_t->execute_task_lock called.
 827  */
 828 static inline int transport_add_task_check_sam_attr(
 829         struct se_task *task,
 830         struct se_task *task_prev,
 831         struct se_device *dev)
 832 {
 833         /*
 834          * No SAM Task attribute emulation enabled, add to tail of
 835          * execution queue
 836          */
 837         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 838                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 839                 return 0;
 840         }
 841         /*
 842          * HEAD_OF_QUEUE attribute for received CDB, which means
 843          * the first task that is associated with a struct se_cmd goes to
 844          * head of the struct se_device->execute_task_list, and task_prev
 845          * after that for each subsequent task
 846          */
 847         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 848                 list_add(&task->t_execute_list,
 849                                 (task_prev != NULL) ?
 850                                 &task_prev->t_execute_list :
 851                                 &dev->execute_task_list);
 852
 853                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 854                                 " in execution queue\n",
 855                                 task->task_se_cmd->t_task_cdb[0]);
 856                 return 1;
 857         }
 858         /*
 859          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 860          * transitioned from Dermant -> Active state, and are added to the end
 861          * of the struct se_device->execute_task_list
 862          */
 863         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 864         return 0;
 865 }
 866
 867 /*      __transport_add_task_to_execute_queue():
 868  *
 869  *      Called with se_dev_t->execute_task_lock called.
 870  */
 871 static void __transport_add_task_to_execute_queue(
 872         struct se_task *task,
 873         struct se_task *task_prev,
 874         struct se_device *dev)
 875 {
 876         int head_of_queue;
 877
 878         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 879         atomic_inc(&dev->execute_tasks);
 880
 881         if (atomic_read(&task->task_state_active))
 882                 return;
 883         /*
 884          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 885          * state list as well.  Running with SAM Task Attribute emulation
 886          * will always return head_of_queue == 0 here
 887          */
 888         if (head_of_queue)
 889                 list_add(&task->t_state_list, (task_prev) ?
 890                                 &task_prev->t_state_list :
 891                                 &dev->state_task_list);
 892         else
 893                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 894
 895         atomic_set(&task->task_state_active, 1);
 896
 897         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 898                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 899                 task, dev);
 900 }
 901
 902 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 903 {
 904         struct se_device *dev;
 905         struct se_task *task;
 906         unsigned long flags;
 907
 908         spin_lock_irqsave(&cmd->t_state_lock, flags);
 909         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 910                 dev = task->se_dev;
 911
 912                 if (atomic_read(&task->task_state_active))
 913                         continue;
 914
 915                 spin_lock(&dev->execute_task_lock);
 916                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 917                 atomic_set(&task->task_state_active, 1);
 918
 919                 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 920                         task->task_se_cmd->se_tfo->get_task_tag(
 921                         task->task_se_cmd), task, dev);
 922
 923                 spin_unlock(&dev->execute_task_lock);
 924         }
 925         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 926 }
 927
 928 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 929 {
 930         struct se_device *dev = cmd->se_dev;
 931         struct se_task *task, *task_prev = NULL;
 932         unsigned long flags;
 933
 934         spin_lock_irqsave(&dev->execute_task_lock, flags);
 935         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 936                 if (atomic_read(&task->task_execute_queue))
 937                         continue;
 938                 /*
 939                  * __transport_add_task_to_execute_queue() handles the
 940                  * SAM Task Attribute emulation if enabled
 941                  */
 942                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 943                 atomic_set(&task->task_execute_queue, 1);
 944                 task_prev = task;
 945         }
 946         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 947 }
 948
 949 /*      transport_remove_task_from_execute_queue():
 950  *
 951  *
 952  */
 953 void transport_remove_task_from_execute_queue(
 954         struct se_task *task,
 955         struct se_device *dev)
 956 {
 957         unsigned long flags;
 958
 959         if (atomic_read(&task->task_execute_queue) == 0) {
 960                 dump_stack();
 961                 return;
 962         }
 963
 964         spin_lock_irqsave(&dev->execute_task_lock, flags);
 965         list_del(&task->t_execute_list);
 966         atomic_set(&task->task_execute_queue, 0);
 967         atomic_dec(&dev->execute_tasks);
 968         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 969 }
 970
 971 /*
 972  * Handle QUEUE_FULL / -EAGAIN status
 973  */
 974
 975 static void target_qf_do_work(struct work_struct *work)
 976 {
 977         struct se_device *dev = container_of(work, struct se_device,
 978                                         qf_work_queue);
 979         struct se_cmd *cmd, *cmd_tmp;
 980
 981         spin_lock_irq(&dev->qf_cmd_lock);
 982         list_for_each_entry_safe(cmd, cmd_tmp, &dev->qf_cmd_list, se_qf_node) {
 983
 984                 list_del(&cmd->se_qf_node);
 985                 atomic_dec(&dev->dev_qf_count);
 986                 smp_mb__after_atomic_dec();
 987                 spin_unlock_irq(&dev->qf_cmd_lock);
 988
 989                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 990                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 991                         (cmd->t_state == TRANSPORT_COMPLETE_OK) ? "COMPLETE_OK" :
 992                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 993                         : "UNKNOWN");
 994                 /*
 995                  * The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
 996                  * has been added to head of queue
 997                  */
 998                 transport_add_cmd_to_queue(cmd, cmd->t_state);
 999
1000                 spin_lock_irq(&dev->qf_cmd_lock);
1001         }
1002         spin_unlock_irq(&dev->qf_cmd_lock);
1003 }
1004
1005 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
1006 {
1007         switch (cmd->data_direction) {
1008         case DMA_NONE:
1009                 return "NONE";
1010         case DMA_FROM_DEVICE:
1011                 return "READ";
1012         case DMA_TO_DEVICE:
1013                 return "WRITE";
1014         case DMA_BIDIRECTIONAL:
1015                 return "BIDI";
1016         default:
1017                 break;
1018         }
1019
1020         return "UNKNOWN";
1021 }
1022
1023 void transport_dump_dev_state(
1024         struct se_device *dev,
1025         char *b,
1026         int *bl)
1027 {
1028         *bl += sprintf(b + *bl, "Status: ");
1029         switch (dev->dev_status) {
1030         case TRANSPORT_DEVICE_ACTIVATED:
1031                 *bl += sprintf(b + *bl, "ACTIVATED");
1032                 break;
1033         case TRANSPORT_DEVICE_DEACTIVATED:
1034                 *bl += sprintf(b + *bl, "DEACTIVATED");
1035                 break;
1036         case TRANSPORT_DEVICE_SHUTDOWN:
1037                 *bl += sprintf(b + *bl, "SHUTDOWN");
1038                 break;
1039         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1040         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1041                 *bl += sprintf(b + *bl, "OFFLINE");
1042                 break;
1043         default:
1044                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1045                 break;
1046         }
1047
1048         *bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
1049                 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1050                 dev->queue_depth);
1051         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
1052                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1053         *bl += sprintf(b + *bl, "        ");
1054 }
1055
1056 /*      transport_release_all_cmds():
1057  *
1058  *
1059  */
1060 static void transport_release_all_cmds(struct se_device *dev)
1061 {
1062         struct se_cmd *cmd, *tcmd;
1063         int bug_out = 0, t_state;
1064         unsigned long flags;
1065
1066         spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1067         list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
1068                                 se_queue_node) {
1069                 t_state = cmd->t_state;
1070                 list_del(&cmd->se_queue_node);
1071                 spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
1072                                 flags);
1073
1074                 pr_err("Releasing ITT: 0x%08x, i_state: %u,"
1075                         " t_state: %u directly\n",
1076                         cmd->se_tfo->get_task_tag(cmd),
1077                         cmd->se_tfo->get_cmd_state(cmd), t_state);
1078
1079                 transport_release_fe_cmd(cmd);
1080                 bug_out = 1;
1081
1082                 spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
1083         }
1084         spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
1085 #if 0
1086         if (bug_out)
1087                 BUG();
1088 #endif
1089 }
1090
1091 void transport_dump_vpd_proto_id(
1092         struct t10_vpd *vpd,
1093         unsigned char *p_buf,
1094         int p_buf_len)
1095 {
1096         unsigned char buf[VPD_TMP_BUF_SIZE];
1097         int len;
1098
1099         memset(buf, 0, VPD_TMP_BUF_SIZE);
1100         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1101
1102         switch (vpd->protocol_identifier) {
1103         case 0x00:
1104                 sprintf(buf+len, "Fibre Channel\n");
1105                 break;
1106         case 0x10:
1107                 sprintf(buf+len, "Parallel SCSI\n");
1108                 break;
1109         case 0x20:
1110                 sprintf(buf+len, "SSA\n");
1111                 break;
1112         case 0x30:
1113                 sprintf(buf+len, "IEEE 1394\n");
1114                 break;
1115         case 0x40:
1116                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1117                                 " Protocol\n");
1118                 break;
1119         case 0x50:
1120                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1121                 break;
1122         case 0x60:
1123                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1124                 break;
1125         case 0x70:
1126                 sprintf(buf+len, "Automation/Drive Interface Transport"
1127                                 " Protocol\n");
1128                 break;
1129         case 0x80:
1130                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1131                 break;
1132         default:
1133                 sprintf(buf+len, "Unknown 0x%02x\n",
1134                                 vpd->protocol_identifier);
1135                 break;
1136         }
1137
1138         if (p_buf)
1139                 strncpy(p_buf, buf, p_buf_len);
1140         else
1141                 pr_debug("%s", buf);
1142 }
1143
1144 void
1145 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1146 {
1147         /*
1148          * Check if the Protocol Identifier Valid (PIV) bit is set..
1149          *
1150          * from spc3r23.pdf section 7.5.1
1151          */
1152          if (page_83[1] & 0x80) {
1153                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1154                 vpd->protocol_identifier_set = 1;
1155                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1156         }
1157 }
1158 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1159
1160 int transport_dump_vpd_assoc(
1161         struct t10_vpd *vpd,
1162         unsigned char *p_buf,
1163         int p_buf_len)
1164 {
1165         unsigned char buf[VPD_TMP_BUF_SIZE];
1166         int ret = 0;
1167         int len;
1168
1169         memset(buf, 0, VPD_TMP_BUF_SIZE);
1170         len = sprintf(buf, "T10 VPD Identifier Association: ");
1171
1172         switch (vpd->association) {
1173         case 0x00:
1174                 sprintf(buf+len, "addressed logical unit\n");
1175                 break;
1176         case 0x10:
1177                 sprintf(buf+len, "target port\n");
1178                 break;
1179         case 0x20:
1180                 sprintf(buf+len, "SCSI target device\n");
1181                 break;
1182         default:
1183                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1184                 ret = -EINVAL;
1185                 break;
1186         }
1187
1188         if (p_buf)
1189                 strncpy(p_buf, buf, p_buf_len);
1190         else
1191                 pr_debug("%s", buf);
1192
1193         return ret;
1194 }
1195
1196 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1197 {
1198         /*
1199          * The VPD identification association..
1200          *
1201          * from spc3r23.pdf Section 7.6.3.1 Table 297
1202          */
1203         vpd->association = (page_83[1] & 0x30);
1204         return transport_dump_vpd_assoc(vpd, NULL, 0);
1205 }
1206 EXPORT_SYMBOL(transport_set_vpd_assoc);
1207
1208 int transport_dump_vpd_ident_type(
1209         struct t10_vpd *vpd,
1210         unsigned char *p_buf,
1211         int p_buf_len)
1212 {
1213         unsigned char buf[VPD_TMP_BUF_SIZE];
1214         int ret = 0;
1215         int len;
1216
1217         memset(buf, 0, VPD_TMP_BUF_SIZE);
1218         len = sprintf(buf, "T10 VPD Identifier Type: ");
1219
1220         switch (vpd->device_identifier_type) {
1221         case 0x00:
1222                 sprintf(buf+len, "Vendor specific\n");
1223                 break;
1224         case 0x01:
1225                 sprintf(buf+len, "T10 Vendor ID based\n");
1226                 break;
1227         case 0x02:
1228                 sprintf(buf+len, "EUI-64 based\n");
1229                 break;
1230         case 0x03:
1231                 sprintf(buf+len, "NAA\n");
1232                 break;
1233         case 0x04:
1234                 sprintf(buf+len, "Relative target port identifier\n");
1235                 break;
1236         case 0x08:
1237                 sprintf(buf+len, "SCSI name string\n");
1238                 break;
1239         default:
1240                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1241                                 vpd->device_identifier_type);
1242                 ret = -EINVAL;
1243                 break;
1244         }
1245
1246         if (p_buf) {
1247                 if (p_buf_len < strlen(buf)+1)
1248                         return -EINVAL;
1249                 strncpy(p_buf, buf, p_buf_len);
1250         } else {
1251                 pr_debug("%s", buf);
1252         }
1253
1254         return ret;
1255 }
1256
1257 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1258 {
1259         /*
1260          * The VPD identifier type..
1261          *
1262          * from spc3r23.pdf Section 7.6.3.1 Table 298
1263          */
1264         vpd->device_identifier_type = (page_83[1] & 0x0f);
1265         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1266 }
1267 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1268
1269 int transport_dump_vpd_ident(
1270         struct t10_vpd *vpd,
1271         unsigned char *p_buf,
1272         int p_buf_len)
1273 {
1274         unsigned char buf[VPD_TMP_BUF_SIZE];
1275         int ret = 0;
1276
1277         memset(buf, 0, VPD_TMP_BUF_SIZE);
1278
1279         switch (vpd->device_identifier_code_set) {
1280         case 0x01: /* Binary */
1281                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1282                         &vpd->device_identifier[0]);
1283                 break;
1284         case 0x02: /* ASCII */
1285                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1286                         &vpd->device_identifier[0]);
1287                 break;
1288         case 0x03: /* UTF-8 */
1289                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1290                         &vpd->device_identifier[0]);
1291                 break;
1292         default:
1293                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1294                         " 0x%02x", vpd->device_identifier_code_set);
1295                 ret = -EINVAL;
1296                 break;
1297         }
1298
1299         if (p_buf)
1300                 strncpy(p_buf, buf, p_buf_len);
1301         else
1302                 pr_debug("%s", buf);
1303
1304         return ret;
1305 }
1306
1307 int
1308 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1309 {
1310         static const char hex_str[] = "0123456789abcdef";
1311         int j = 0, i = 4; /* offset to start of the identifer */
1312
1313         /*
1314          * The VPD Code Set (encoding)
1315          *
1316          * from spc3r23.pdf Section 7.6.3.1 Table 296
1317          */
1318         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1319         switch (vpd->device_identifier_code_set) {
1320         case 0x01: /* Binary */
1321                 vpd->device_identifier[j++] =
1322                                 hex_str[vpd->device_identifier_type];
1323                 while (i < (4 + page_83[3])) {
1324                         vpd->device_identifier[j++] =
1325                                 hex_str[(page_83[i] & 0xf0) >> 4];
1326                         vpd->device_identifier[j++] =
1327                                 hex_str[page_83[i] & 0x0f];
1328                         i++;
1329                 }
1330                 break;
1331         case 0x02: /* ASCII */
1332         case 0x03: /* UTF-8 */
1333                 while (i < (4 + page_83[3]))
1334                         vpd->device_identifier[j++] = page_83[i++];
1335                 break;
1336         default:
1337                 break;
1338         }
1339
1340         return transport_dump_vpd_ident(vpd, NULL, 0);
1341 }
1342 EXPORT_SYMBOL(transport_set_vpd_ident);
1343
1344 static void core_setup_task_attr_emulation(struct se_device *dev)
1345 {
1346         /*
1347          * If this device is from Target_Core_Mod/pSCSI, disable the
1348          * SAM Task Attribute emulation.
1349          *
1350          * This is currently not available in upsream Linux/SCSI Target
1351          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1352          */
1353         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1354                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1355                 return;
1356         }
1357
1358         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1359         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1360                 " device\n", dev->transport->name,
1361                 dev->transport->get_device_rev(dev));
1362 }
1363
1364 static void scsi_dump_inquiry(struct se_device *dev)
1365 {
1366         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1367         int i, device_type;
1368         /*
1369          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1370          */
1371         pr_debug("  Vendor: ");
1372         for (i = 0; i < 8; i++)
1373                 if (wwn->vendor[i] >= 0x20)
1374                         pr_debug("%c", wwn->vendor[i]);
1375                 else
1376                         pr_debug(" ");
1377
1378         pr_debug("  Model: ");
1379         for (i = 0; i < 16; i++)
1380                 if (wwn->model[i] >= 0x20)
1381                         pr_debug("%c", wwn->model[i]);
1382                 else
1383                         pr_debug(" ");
1384
1385         pr_debug("  Revision: ");
1386         for (i = 0; i < 4; i++)
1387                 if (wwn->revision[i] >= 0x20)
1388                         pr_debug("%c", wwn->revision[i]);
1389                 else
1390                         pr_debug(" ");
1391
1392         pr_debug("\n");
1393
1394         device_type = dev->transport->get_device_type(dev);
1395         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1396         pr_debug("                 ANSI SCSI revision: %02x\n",
1397                                 dev->transport->get_device_rev(dev));
1398 }
1399
1400 struct se_device *transport_add_device_to_core_hba(
1401         struct se_hba *hba,
1402         struct se_subsystem_api *transport,
1403         struct se_subsystem_dev *se_dev,
1404         u32 device_flags,
1405         void *transport_dev,
1406         struct se_dev_limits *dev_limits,
1407         const char *inquiry_prod,
1408         const char *inquiry_rev)
1409 {
1410         int force_pt;
1411         struct se_device  *dev;
1412
1413         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1414         if (!dev) {
1415                 pr_err("Unable to allocate memory for se_dev_t\n");
1416                 return NULL;
1417         }
1418
1419         transport_init_queue_obj(&dev->dev_queue_obj);
1420         dev->dev_flags          = device_flags;
1421         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1422         dev->dev_ptr            = transport_dev;
1423         dev->se_hba             = hba;
1424         dev->se_sub_dev         = se_dev;
1425         dev->transport          = transport;
1426         atomic_set(&dev->active_cmds, 0);
1427         INIT_LIST_HEAD(&dev->dev_list);
1428         INIT_LIST_HEAD(&dev->dev_sep_list);
1429         INIT_LIST_HEAD(&dev->dev_tmr_list);
1430         INIT_LIST_HEAD(&dev->execute_task_list);
1431         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1432         INIT_LIST_HEAD(&dev->ordered_cmd_list);
1433         INIT_LIST_HEAD(&dev->state_task_list);
1434         INIT_LIST_HEAD(&dev->qf_cmd_list);
1435         spin_lock_init(&dev->execute_task_lock);
1436         spin_lock_init(&dev->delayed_cmd_lock);
1437         spin_lock_init(&dev->ordered_cmd_lock);
1438         spin_lock_init(&dev->state_task_lock);
1439         spin_lock_init(&dev->dev_alua_lock);
1440         spin_lock_init(&dev->dev_reservation_lock);
1441         spin_lock_init(&dev->dev_status_lock);
1442         spin_lock_init(&dev->dev_status_thr_lock);
1443         spin_lock_init(&dev->se_port_lock);
1444         spin_lock_init(&dev->se_tmr_lock);
1445         spin_lock_init(&dev->qf_cmd_lock);
1446
1447         dev->queue_depth        = dev_limits->queue_depth;
1448         atomic_set(&dev->depth_left, dev->queue_depth);
1449         atomic_set(&dev->dev_ordered_id, 0);
1450
1451         se_dev_set_default_attribs(dev, dev_limits);
1452
1453         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1454         dev->creation_time = get_jiffies_64();
1455         spin_lock_init(&dev->stats_lock);
1456
1457         spin_lock(&hba->device_lock);
1458         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1459         hba->dev_count++;
1460         spin_unlock(&hba->device_lock);
1461         /*
1462          * Setup the SAM Task Attribute emulation for struct se_device
1463          */
1464         core_setup_task_attr_emulation(dev);
1465         /*
1466          * Force PR and ALUA passthrough emulation with internal object use.
1467          */
1468         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1469         /*
1470          * Setup the Reservations infrastructure for struct se_device
1471          */
1472         core_setup_reservations(dev, force_pt);
1473         /*
1474          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1475          */
1476         if (core_setup_alua(dev, force_pt) < 0)
1477                 goto out;
1478
1479         /*
1480          * Startup the struct se_device processing thread
1481          */
1482         dev->process_thread = kthread_run(transport_processing_thread, dev,
1483                                           "LIO_%s", dev->transport->name);
1484         if (IS_ERR(dev->process_thread)) {
1485                 pr_err("Unable to create kthread: LIO_%s\n",
1486                         dev->transport->name);
1487                 goto out;
1488         }
1489         /*
1490          * Setup work_queue for QUEUE_FULL
1491          */
1492         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1493         /*
1494          * Preload the initial INQUIRY const values if we are doing
1495          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1496          * passthrough because this is being provided by the backend LLD.
1497          * This is required so that transport_get_inquiry() copies these
1498          * originals once back into DEV_T10_WWN(dev) for the virtual device
1499          * setup.
1500          */
1501         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1502                 if (!inquiry_prod || !inquiry_rev) {
1503                         pr_err("All non TCM/pSCSI plugins require"
1504                                 " INQUIRY consts\n");
1505                         goto out;
1506                 }
1507
1508                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1509                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1510                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1511         }
1512         scsi_dump_inquiry(dev);
1513
1514         return dev;
1515 out:
1516         kthread_stop(dev->process_thread);
1517
1518         spin_lock(&hba->device_lock);
1519         list_del(&dev->dev_list);
1520         hba->dev_count--;
1521         spin_unlock(&hba->device_lock);
1522
1523         se_release_vpd_for_dev(dev);
1524
1525         kfree(dev);
1526
1527         return NULL;
1528 }
1529 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1530
1531 /*      transport_generic_prepare_cdb():
1532  *
1533  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1534  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1535  *      The point of this is since we are mapping iSCSI LUNs to
1536  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1537  *      devices and HBAs for a loop.
1538  */
1539 static inline void transport_generic_prepare_cdb(
1540         unsigned char *cdb)
1541 {
1542         switch (cdb[0]) {
1543         case READ_10: /* SBC - RDProtect */
1544         case READ_12: /* SBC - RDProtect */
1545         case READ_16: /* SBC - RDProtect */
1546         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1547         case VERIFY: /* SBC - VRProtect */
1548         case VERIFY_16: /* SBC - VRProtect */
1549         case WRITE_VERIFY: /* SBC - VRProtect */
1550         case WRITE_VERIFY_12: /* SBC - VRProtect */
1551                 break;
1552         default:
1553                 cdb[1] &= 0x1f; /* clear logical unit number */
1554                 break;
1555         }
1556 }
1557
1558 static struct se_task *
1559 transport_generic_get_task(struct se_cmd *cmd,
1560                 enum dma_data_direction data_direction)
1561 {
1562         struct se_task *task;
1563         struct se_device *dev = cmd->se_dev;
1564
1565         task = dev->transport->alloc_task(cmd->t_task_cdb);
1566         if (!task) {
1567                 pr_err("Unable to allocate struct se_task\n");
1568                 return NULL;
1569         }
1570
1571         INIT_LIST_HEAD(&task->t_list);
1572         INIT_LIST_HEAD(&task->t_execute_list);
1573         INIT_LIST_HEAD(&task->t_state_list);
1574         init_completion(&task->task_stop_comp);
1575         task->task_se_cmd = cmd;
1576         task->se_dev = dev;
1577         task->task_data_direction = data_direction;
1578
1579         return task;
1580 }
1581
1582 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1583
1584 /*
1585  * Used by fabric modules containing a local struct se_cmd within their
1586  * fabric dependent per I/O descriptor.
1587  */
1588 void transport_init_se_cmd(
1589         struct se_cmd *cmd,
1590         struct target_core_fabric_ops *tfo,
1591         struct se_session *se_sess,
1592         u32 data_length,
1593         int data_direction,
1594         int task_attr,
1595         unsigned char *sense_buffer)
1596 {
1597         INIT_LIST_HEAD(&cmd->se_lun_node);
1598         INIT_LIST_HEAD(&cmd->se_delayed_node);
1599         INIT_LIST_HEAD(&cmd->se_ordered_node);
1600         INIT_LIST_HEAD(&cmd->se_qf_node);
1601
1602         INIT_LIST_HEAD(&cmd->t_task_list);
1603         init_completion(&cmd->transport_lun_fe_stop_comp);
1604         init_completion(&cmd->transport_lun_stop_comp);
1605         init_completion(&cmd->t_transport_stop_comp);
1606         spin_lock_init(&cmd->t_state_lock);
1607         atomic_set(&cmd->transport_dev_active, 1);
1608
1609         cmd->se_tfo = tfo;
1610         cmd->se_sess = se_sess;
1611         cmd->data_length = data_length;
1612         cmd->data_direction = data_direction;
1613         cmd->sam_task_attr = task_attr;
1614         cmd->sense_buffer = sense_buffer;
1615 }
1616 EXPORT_SYMBOL(transport_init_se_cmd);
1617
1618 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1619 {
1620         /*
1621          * Check if SAM Task Attribute emulation is enabled for this
1622          * struct se_device storage object
1623          */
1624         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1625                 return 0;
1626
1627         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1628                 pr_debug("SAM Task Attribute ACA"
1629                         " emulation is not supported\n");
1630                 return -EINVAL;
1631         }
1632         /*
1633          * Used to determine when ORDERED commands should go from
1634          * Dormant to Active status.
1635          */
1636         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1637         smp_mb__after_atomic_inc();
1638         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1639                         cmd->se_ordered_id, cmd->sam_task_attr,
1640                         cmd->se_dev->transport->name);
1641         return 0;
1642 }
1643
1644 void transport_free_se_cmd(
1645         struct se_cmd *se_cmd)
1646 {
1647         if (se_cmd->se_tmr_req)
1648                 core_tmr_release_req(se_cmd->se_tmr_req);
1649         /*
1650          * Check and free any extended CDB buffer that was allocated
1651          */
1652         if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
1653                 kfree(se_cmd->t_task_cdb);
1654 }
1655 EXPORT_SYMBOL(transport_free_se_cmd);
1656
1657 static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
1658
1659 /*      transport_generic_allocate_tasks():
1660  *
1661  *      Called from fabric RX Thread.
1662  */
1663 int transport_generic_allocate_tasks(
1664         struct se_cmd *cmd,
1665         unsigned char *cdb)
1666 {
1667         int ret;
1668
1669         transport_generic_prepare_cdb(cdb);
1670
1671         /*
1672          * This is needed for early exceptions.
1673          */
1674         cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1675
1676         /*
1677          * Ensure that the received CDB is less than the max (252 + 8) bytes
1678          * for VARIABLE_LENGTH_CMD
1679          */
1680         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1681                 pr_err("Received SCSI CDB with command_size: %d that"
1682                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1683                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1684                 return -EINVAL;
1685         }
1686         /*
1687          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1688          * allocate the additional extended CDB buffer now..  Otherwise
1689          * setup the pointer from __t_task_cdb to t_task_cdb.
1690          */
1691         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1692                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1693                                                 GFP_KERNEL);
1694                 if (!cmd->t_task_cdb) {
1695                         pr_err("Unable to allocate cmd->t_task_cdb"
1696                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1697                                 scsi_command_size(cdb),
1698                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1699                         return -ENOMEM;
1700                 }
1701         } else
1702                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1703         /*
1704          * Copy the original CDB into cmd->
1705          */
1706         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1707         /*
1708          * Setup the received CDB based on SCSI defined opcodes and
1709          * perform unit attention, persistent reservations and ALUA
1710          * checks for virtual device backends.  The cmd->t_task_cdb
1711          * pointer is expected to be setup before we reach this point.
1712          */
1713         ret = transport_generic_cmd_sequencer(cmd, cdb);
1714         if (ret < 0)
1715                 return ret;
1716         /*
1717          * Check for SAM Task Attribute Emulation
1718          */
1719         if (transport_check_alloc_task_attr(cmd) < 0) {
1720                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1721                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1722                 return -EINVAL;
1723         }
1724         spin_lock(&cmd->se_lun->lun_sep_lock);
1725         if (cmd->se_lun->lun_sep)
1726                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1727         spin_unlock(&cmd->se_lun->lun_sep_lock);
1728         return 0;
1729 }
1730 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1731
1732 /*
1733  * Used by fabric module frontends not defining a TFO->new_cmd_map()
1734  * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
1735  */
1736 int transport_generic_handle_cdb(
1737         struct se_cmd *cmd)
1738 {
1739         if (!cmd->se_lun) {
1740                 dump_stack();
1741                 pr_err("cmd->se_lun is NULL\n");
1742                 return -EINVAL;
1743         }
1744
1745         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
1746         return 0;
1747 }
1748 EXPORT_SYMBOL(transport_generic_handle_cdb);
1749
1750 /*
1751  * Used by fabric module frontends to queue tasks directly.
1752  * Many only be used from process context only
1753  */
1754 int transport_handle_cdb_direct(
1755         struct se_cmd *cmd)
1756 {
1757         if (!cmd->se_lun) {
1758                 dump_stack();
1759                 pr_err("cmd->se_lun is NULL\n");
1760                 return -EINVAL;
1761         }
1762         if (in_interrupt()) {
1763                 dump_stack();
1764                 pr_err("transport_generic_handle_cdb cannot be called"
1765                                 " from interrupt context\n");
1766                 return -EINVAL;
1767         }
1768
1769         return transport_generic_new_cmd(cmd);
1770 }
1771 EXPORT_SYMBOL(transport_handle_cdb_direct);
1772
1773 /*
1774  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1775  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1776  * complete setup in TCM process context w/ TFO->new_cmd_map().
1777  */
1778 int transport_generic_handle_cdb_map(
1779         struct se_cmd *cmd)
1780 {
1781         if (!cmd->se_lun) {
1782                 dump_stack();
1783                 pr_err("cmd->se_lun is NULL\n");
1784                 return -EINVAL;
1785         }
1786
1787         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
1788         return 0;
1789 }
1790 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1791
1792 /*      transport_generic_handle_data():
1793  *
1794  *
1795  */
1796 int transport_generic_handle_data(
1797         struct se_cmd *cmd)
1798 {
1799         /*
1800          * For the software fabric case, then we assume the nexus is being
1801          * failed/shutdown when signals are pending from the kthread context
1802          * caller, so we return a failure.  For the HW target mode case running
1803          * in interrupt code, the signal_pending() check is skipped.
1804          */
1805         if (!in_interrupt() && signal_pending(current))
1806                 return -EPERM;
1807         /*
1808          * If the received CDB has aleady been ABORTED by the generic
1809          * target engine, we now call transport_check_aborted_status()
1810          * to queue any delated TASK_ABORTED status for the received CDB to the
1811          * fabric module as we are expecting no further incoming DATA OUT
1812          * sequences at this point.
1813          */
1814         if (transport_check_aborted_status(cmd, 1) != 0)
1815                 return 0;
1816
1817         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
1818         return 0;
1819 }
1820 EXPORT_SYMBOL(transport_generic_handle_data);
1821
1822 /*      transport_generic_handle_tmr():
1823  *
1824  *
1825  */
1826 int transport_generic_handle_tmr(
1827         struct se_cmd *cmd)
1828 {
1829         /*
1830          * This is needed for early exceptions.
1831          */
1832         cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
1833
1834         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
1835         return 0;
1836 }
1837 EXPORT_SYMBOL(transport_generic_handle_tmr);
1838
1839 void transport_generic_free_cmd_intr(
1840         struct se_cmd *cmd)
1841 {
1842         transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
1843 }
1844 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1845
1846 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1847 {
1848         struct se_task *task, *task_tmp;
1849         unsigned long flags;
1850         int ret = 0;
1851
1852         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1853                 cmd->se_tfo->get_task_tag(cmd));
1854
1855         /*
1856          * No tasks remain in the execution queue
1857          */
1858         spin_lock_irqsave(&cmd->t_state_lock, flags);
1859         list_for_each_entry_safe(task, task_tmp,
1860                                 &cmd->t_task_list, t_list) {
1861                 pr_debug("task_no[%d] - Processing task %p\n",
1862                                 task->task_no, task);
1863                 /*
1864                  * If the struct se_task has not been sent and is not active,
1865                  * remove the struct se_task from the execution queue.
1866                  */
1867                 if (!atomic_read(&task->task_sent) &&
1868                     !atomic_read(&task->task_active)) {
1869                         spin_unlock_irqrestore(&cmd->t_state_lock,
1870                                         flags);
1871                         transport_remove_task_from_execute_queue(task,
1872                                         task->se_dev);
1873
1874                         pr_debug("task_no[%d] - Removed from execute queue\n",
1875                                 task->task_no);
1876                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1877                         continue;
1878                 }
1879
1880                 /*
1881                  * If the struct se_task is active, sleep until it is returned
1882                  * from the plugin.
1883                  */
1884                 if (atomic_read(&task->task_active)) {
1885                         atomic_set(&task->task_stop, 1);
1886                         spin_unlock_irqrestore(&cmd->t_state_lock,
1887                                         flags);
1888
1889                         pr_debug("task_no[%d] - Waiting to complete\n",
1890                                 task->task_no);
1891                         wait_for_completion(&task->task_stop_comp);
1892                         pr_debug("task_no[%d] - Stopped successfully\n",
1893                                 task->task_no);
1894
1895                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1896                         atomic_dec(&cmd->t_task_cdbs_left);
1897
1898                         atomic_set(&task->task_active, 0);
1899                         atomic_set(&task->task_stop, 0);
1900                 } else {
1901                         pr_debug("task_no[%d] - Did nothing\n", task->task_no);
1902                         ret++;
1903                 }
1904
1905                 __transport_stop_task_timer(task, &flags);
1906         }
1907         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1908
1909         return ret;
1910 }
1911
1912 /*
1913  * Handle SAM-esque emulation for generic transport request failures.
1914  */
1915 static void transport_generic_request_failure(
1916         struct se_cmd *cmd,
1917         struct se_device *dev,
1918         int complete,
1919         int sc)
1920 {
1921         int ret = 0;
1922
1923         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1924                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1925                 cmd->t_task_cdb[0]);
1926         pr_debug("-----[ i_state: %d t_state/def_t_state:"
1927                 " %d/%d transport_error_status: %d\n",
1928                 cmd->se_tfo->get_cmd_state(cmd),
1929                 cmd->t_state, cmd->deferred_t_state,
1930                 cmd->transport_error_status);
1931         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1932                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1933                 " t_transport_active: %d t_transport_stop: %d"
1934                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1935                 atomic_read(&cmd->t_task_cdbs_left),
1936                 atomic_read(&cmd->t_task_cdbs_sent),
1937                 atomic_read(&cmd->t_task_cdbs_ex_left),
1938                 atomic_read(&cmd->t_transport_active),
1939                 atomic_read(&cmd->t_transport_stop),
1940                 atomic_read(&cmd->t_transport_sent));
1941
1942         transport_stop_all_task_timers(cmd);
1943
1944         if (dev)
1945                 atomic_inc(&dev->depth_left);
1946         /*
1947          * For SAM Task Attribute emulation for failed struct se_cmd
1948          */
1949         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1950                 transport_complete_task_attr(cmd);
1951
1952         if (complete) {
1953                 transport_direct_request_timeout(cmd);
1954                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1955         }
1956
1957         switch (cmd->transport_error_status) {
1958         case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1959                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1960                 break;
1961         case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1962                 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1963                 break;
1964         case PYX_TRANSPORT_INVALID_CDB_FIELD:
1965                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1966                 break;
1967         case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1968                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1969                 break;
1970         case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1971                 if (!sc)
1972                         transport_new_cmd_failure(cmd);
1973                 /*
1974                  * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1975                  * we force this session to fall back to session
1976                  * recovery.
1977                  */
1978                 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1979                 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1980
1981                 goto check_stop;
1982         case PYX_TRANSPORT_LU_COMM_FAILURE:
1983         case PYX_TRANSPORT_ILLEGAL_REQUEST:
1984                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1985                 break;
1986         case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1987                 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1988                 break;
1989         case PYX_TRANSPORT_WRITE_PROTECTED:
1990                 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1991                 break;
1992         case PYX_TRANSPORT_RESERVATION_CONFLICT:
1993                 /*
1994                  * No SENSE Data payload for this case, set SCSI Status
1995                  * and queue the response to $FABRIC_MOD.
1996                  *
1997                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1998                  */
1999                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2000                 /*
2001                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2002                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2003                  * CONFLICT STATUS.
2004                  *
2005                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2006                  */
2007                 if (cmd->se_sess &&
2008                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2009                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2010                                 cmd->orig_fe_lun, 0x2C,
2011                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2012
2013                 ret = cmd->se_tfo->queue_status(cmd);
2014                 if (ret == -EAGAIN)
2015                         goto queue_full;
2016                 goto check_stop;
2017         case PYX_TRANSPORT_USE_SENSE_REASON:
2018                 /*
2019                  * struct se_cmd->scsi_sense_reason already set
2020                  */
2021                 break;
2022         default:
2023                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
2024                         cmd->t_task_cdb[0],
2025                         cmd->transport_error_status);
2026                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
2027                 break;
2028         }
2029
2030         if (!sc)
2031                 transport_new_cmd_failure(cmd);
2032         else {
2033                 ret = transport_send_check_condition_and_sense(cmd,
2034                                 cmd->scsi_sense_reason, 0);
2035                 if (ret == -EAGAIN)
2036                         goto queue_full;
2037         }
2038
2039 check_stop:
2040         transport_lun_remove_cmd(cmd);
2041         if (!transport_cmd_check_stop_to_fabric(cmd))
2042                 ;
2043         return;
2044
2045 queue_full:
2046         cmd->t_state = TRANSPORT_COMPLETE_OK;
2047         transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
2048 }
2049
2050 static void transport_direct_request_timeout(struct se_cmd *cmd)
2051 {
2052         unsigned long flags;
2053
2054         spin_lock_irqsave(&cmd->t_state_lock, flags);
2055         if (!atomic_read(&cmd->t_transport_timeout)) {
2056                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2057                 return;
2058         }
2059         if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
2060                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2061                 return;
2062         }
2063
2064         atomic_sub(atomic_read(&cmd->t_transport_timeout),
2065                    &cmd->t_se_count);
2066         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2067 }
2068
2069 static void transport_generic_request_timeout(struct se_cmd *cmd)
2070 {
2071         unsigned long flags;
2072
2073         /*
2074          * Reset cmd->t_se_count to allow transport_generic_remove()
2075          * to allow last call to free memory resources.
2076          */
2077         spin_lock_irqsave(&cmd->t_state_lock, flags);
2078         if (atomic_read(&cmd->t_transport_timeout) > 1) {
2079                 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
2080
2081                 atomic_sub(tmp, &cmd->t_se_count);
2082         }
2083         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2084
2085         transport_generic_remove(cmd, 0);
2086 }
2087
2088 static inline u32 transport_lba_21(unsigned char *cdb)
2089 {
2090         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2091 }
2092
2093 static inline u32 transport_lba_32(unsigned char *cdb)
2094 {
2095         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2096 }
2097
2098 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2099 {
2100         unsigned int __v1, __v2;
2101
2102         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2103         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2104
2105         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2106 }
2107
2108 /*
2109  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2110  */
2111 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2112 {
2113         unsigned int __v1, __v2;
2114
2115         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2116         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2117
2118         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2119 }
2120
2121 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2122 {
2123         unsigned long flags;
2124
2125         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2126         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2127         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2128 }
2129
2130 /*
2131  * Called from interrupt context.
2132  */
2133 static void transport_task_timeout_handler(unsigned long data)
2134 {
2135         struct se_task *task = (struct se_task *)data;
2136         struct se_cmd *cmd = task->task_se_cmd;
2137         unsigned long flags;
2138
2139         pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2140
2141         spin_lock_irqsave(&cmd->t_state_lock, flags);
2142         if (task->task_flags & TF_STOP) {
2143                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2144                 return;
2145         }
2146         task->task_flags &= ~TF_RUNNING;
2147
2148         /*
2149          * Determine if transport_complete_task() has already been called.
2150          */
2151         if (!atomic_read(&task->task_active)) {
2152                 pr_debug("transport task: %p cmd: %p timeout task_active"
2153                                 " == 0\n", task, cmd);
2154                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2155                 return;
2156         }
2157
2158         atomic_inc(&cmd->t_se_count);
2159         atomic_inc(&cmd->t_transport_timeout);
2160         cmd->t_tasks_failed = 1;
2161
2162         atomic_set(&task->task_timeout, 1);
2163         task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2164         task->task_scsi_status = 1;
2165
2166         if (atomic_read(&task->task_stop)) {
2167                 pr_debug("transport task: %p cmd: %p timeout task_stop"
2168                                 " == 1\n", task, cmd);
2169                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2170                 complete(&task->task_stop_comp);
2171                 return;
2172         }
2173
2174         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2175                 pr_debug("transport task: %p cmd: %p timeout non zero"
2176                                 " t_task_cdbs_left\n", task, cmd);
2177                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2178                 return;
2179         }
2180         pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2181                         task, cmd);
2182
2183         cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2184         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2185
2186         transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
2187 }
2188
2189 /*
2190  * Called with cmd->t_state_lock held.
2191  */
2192 static void transport_start_task_timer(struct se_task *task)
2193 {
2194         struct se_device *dev = task->se_dev;
2195         int timeout;
2196
2197         if (task->task_flags & TF_RUNNING)
2198                 return;
2199         /*
2200          * If the task_timeout is disabled, exit now.
2201          */
2202         timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2203         if (!timeout)
2204                 return;
2205
2206         init_timer(&task->task_timer);
2207         task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2208         task->task_timer.data = (unsigned long) task;
2209         task->task_timer.function = transport_task_timeout_handler;
2210
2211         task->task_flags |= TF_RUNNING;
2212         add_timer(&task->task_timer);
2213 #if 0
2214         pr_debug("Starting task timer for cmd: %p task: %p seconds:"
2215                 " %d\n", task->task_se_cmd, task, timeout);
2216 #endif
2217 }
2218
2219 /*
2220  * Called with spin_lock_irq(&cmd->t_state_lock) held.
2221  */
2222 void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
2223 {
2224         struct se_cmd *cmd = task->task_se_cmd;
2225
2226         if (!task->task_flags & TF_RUNNING)
2227                 return;
2228
2229         task->task_flags |= TF_STOP;
2230         spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
2231
2232         del_timer_sync(&task->task_timer);
2233
2234         spin_lock_irqsave(&cmd->t_state_lock, *flags);
2235         task->task_flags &= ~TF_RUNNING;
2236         task->task_flags &= ~TF_STOP;
2237 }
2238
2239 static void transport_stop_all_task_timers(struct se_cmd *cmd)
2240 {
2241         struct se_task *task = NULL, *task_tmp;
2242         unsigned long flags;
2243
2244         spin_lock_irqsave(&cmd->t_state_lock, flags);
2245         list_for_each_entry_safe(task, task_tmp,
2246                                 &cmd->t_task_list, t_list)
2247                 __transport_stop_task_timer(task, &flags);
2248         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2249 }
2250
2251 static inline int transport_tcq_window_closed(struct se_device *dev)
2252 {
2253         if (dev->dev_tcq_window_closed++ <
2254                         PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2255                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2256         } else
2257                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2258
2259         wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2260         return 0;
2261 }
2262
2263 /*
2264  * Called from Fabric Module context from transport_execute_tasks()
2265  *
2266  * The return of this function determins if the tasks from struct se_cmd
2267  * get added to the execution queue in transport_execute_tasks(),
2268  * or are added to the delayed or ordered lists here.
2269  */
2270 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2271 {
2272         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2273                 return 1;
2274         /*
2275          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2276          * to allow the passed struct se_cmd list of tasks to the front of the list.
2277          */
2278          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2279                 atomic_inc(&cmd->se_dev->dev_hoq_count);
2280                 smp_mb__after_atomic_inc();
2281                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2282                         " 0x%02x, se_ordered_id: %u\n",
2283                         cmd->t_task_cdb[0],
2284                         cmd->se_ordered_id);
2285                 return 1;
2286         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2287                 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2288                 list_add_tail(&cmd->se_ordered_node,
2289                                 &cmd->se_dev->ordered_cmd_list);
2290                 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2291
2292                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2293                 smp_mb__after_atomic_inc();
2294
2295                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2296                                 " list, se_ordered_id: %u\n",
2297                                 cmd->t_task_cdb[0],
2298                                 cmd->se_ordered_id);
2299                 /*
2300                  * Add ORDERED command to tail of execution queue if
2301                  * no other older commands exist that need to be
2302                  * completed first.
2303                  */
2304                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2305                         return 1;
2306         } else {
2307                 /*
2308                  * For SIMPLE and UNTAGGED Task Attribute commands
2309                  */
2310                 atomic_inc(&cmd->se_dev->simple_cmds);
2311                 smp_mb__after_atomic_inc();
2312         }
2313         /*
2314          * Otherwise if one or more outstanding ORDERED task attribute exist,
2315          * add the dormant task(s) built for the passed struct se_cmd to the
2316          * execution queue and become in Active state for this struct se_device.
2317          */
2318         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2319                 /*
2320                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2321                  * will be drained upon completion of HEAD_OF_QUEUE task.
2322                  */
2323                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2324                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2325                 list_add_tail(&cmd->se_delayed_node,
2326                                 &cmd->se_dev->delayed_cmd_list);
2327                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2328
2329                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2330                         " delayed CMD list, se_ordered_id: %u\n",
2331                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2332                         cmd->se_ordered_id);
2333                 /*
2334                  * Return zero to let transport_execute_tasks() know
2335                  * not to add the delayed tasks to the execution list.
2336                  */
2337                 return 0;
2338         }
2339         /*
2340          * Otherwise, no ORDERED task attributes exist..
2341          */
2342         return 1;
2343 }
2344
2345 /*
2346  * Called from fabric module context in transport_generic_new_cmd() and
2347  * transport_generic_process_write()
2348  */
2349 static int transport_execute_tasks(struct se_cmd *cmd)
2350 {
2351         int add_tasks;
2352
2353         if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2354                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2355                 transport_generic_request_failure(cmd, NULL, 0, 1);
2356                 return 0;
2357         }
2358
2359         /*
2360          * Call transport_cmd_check_stop() to see if a fabric exception
2361          * has occurred that prevents execution.
2362          */
2363         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2364                 /*
2365                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2366                  * attribute for the tasks of the received struct se_cmd CDB
2367                  */
2368                 add_tasks = transport_execute_task_attr(cmd);
2369                 if (!add_tasks)
2370                         goto execute_tasks;
2371                 /*
2372                  * This calls transport_add_tasks_from_cmd() to handle
2373                  * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2374                  * (if enabled) in __transport_add_task_to_execute_queue() and
2375                  * transport_add_task_check_sam_attr().
2376                  */
2377                 transport_add_tasks_from_cmd(cmd);
2378         }
2379         /*
2380          * Kick the execution queue for the cmd associated struct se_device
2381          * storage object.
2382          */
2383 execute_tasks:
2384         __transport_execute_tasks(cmd->se_dev);
2385         return 0;
2386 }
2387
2388 /*
2389  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2390  * from struct se_device->execute_task_list and
2391  *
2392  * Called from transport_processing_thread()
2393  */
2394 static int __transport_execute_tasks(struct se_device *dev)
2395 {
2396         int error;
2397         struct se_cmd *cmd = NULL;
2398         struct se_task *task = NULL;
2399         unsigned long flags;
2400
2401         /*
2402          * Check if there is enough room in the device and HBA queue to send
2403          * struct se_tasks to the selected transport.
2404          */
2405 check_depth:
2406         if (!atomic_read(&dev->depth_left))
2407                 return transport_tcq_window_closed(dev);
2408
2409         dev->dev_tcq_window_closed = 0;
2410
2411         spin_lock_irq(&dev->execute_task_lock);
2412         if (list_empty(&dev->execute_task_list)) {
2413                 spin_unlock_irq(&dev->execute_task_lock);
2414                 return 0;
2415         }
2416         task = list_first_entry(&dev->execute_task_list,
2417                                 struct se_task, t_execute_list);
2418         list_del(&task->t_execute_list);
2419         atomic_set(&task->task_execute_queue, 0);
2420         atomic_dec(&dev->execute_tasks);
2421         spin_unlock_irq(&dev->execute_task_lock);
2422
2423         atomic_dec(&dev->depth_left);
2424
2425         cmd = task->task_se_cmd;
2426
2427         spin_lock_irqsave(&cmd->t_state_lock, flags);
2428         atomic_set(&task->task_active, 1);
2429         atomic_set(&task->task_sent, 1);
2430         atomic_inc(&cmd->t_task_cdbs_sent);
2431
2432         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2433             cmd->t_task_list_num)
2434                 atomic_set(&cmd->transport_sent, 1);
2435
2436         transport_start_task_timer(task);
2437         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2438         /*
2439          * The struct se_cmd->transport_emulate_cdb() function pointer is used
2440          * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2441          * struct se_subsystem_api->do_task() caller below.
2442          */
2443         if (cmd->transport_emulate_cdb) {
2444                 error = cmd->transport_emulate_cdb(cmd);
2445                 if (error != 0) {
2446                         cmd->transport_error_status = error;
2447                         atomic_set(&task->task_active, 0);
2448                         atomic_set(&cmd->transport_sent, 0);
2449                         transport_stop_tasks_for_cmd(cmd);
2450                         transport_generic_request_failure(cmd, dev, 0, 1);
2451                         goto check_depth;
2452                 }
2453                 /*
2454                  * Handle the successful completion for transport_emulate_cdb()
2455                  * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2456                  * Otherwise the caller is expected to complete the task with
2457                  * proper status.
2458                  */
2459                 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2460                         cmd->scsi_status = SAM_STAT_GOOD;
2461                         task->task_scsi_status = GOOD;
2462                         transport_complete_task(task, 1);
2463                 }
2464         } else {
2465                 /*
2466                  * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2467                  * RAMDISK we use the internal transport_emulate_control_cdb() logic
2468                  * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2469                  * LUN emulation code.
2470                  *
2471                  * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2472                  * call ->do_task() directly and let the underlying TCM subsystem plugin
2473                  * code handle the CDB emulation.
2474                  */
2475                 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2476                     (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2477                         error = transport_emulate_control_cdb(task);
2478                 else
2479                         error = dev->transport->do_task(task);
2480
2481                 if (error != 0) {
2482                         cmd->transport_error_status = error;
2483                         atomic_set(&task->task_active, 0);
2484                         atomic_set(&cmd->transport_sent, 0);
2485                         transport_stop_tasks_for_cmd(cmd);
2486                         transport_generic_request_failure(cmd, dev, 0, 1);
2487                 }
2488         }
2489
2490         goto check_depth;
2491
2492         return 0;
2493 }
2494
2495 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2496 {
2497         unsigned long flags;
2498         /*
2499          * Any unsolicited data will get dumped for failed command inside of
2500          * the fabric plugin
2501          */
2502         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2503         se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2504         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2505         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2506 }
2507
2508 static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
2509
2510 static inline u32 transport_get_sectors_6(
2511         unsigned char *cdb,
2512         struct se_cmd *cmd,
2513         int *ret)
2514 {
2515         struct se_device *dev = cmd->se_dev;
2516
2517         /*
2518          * Assume TYPE_DISK for non struct se_device objects.
2519          * Use 8-bit sector value.
2520          */
2521         if (!dev)
2522                 goto type_disk;
2523
2524         /*
2525          * Use 24-bit allocation length for TYPE_TAPE.
2526          */
2527         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2528                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2529
2530         /*
2531          * Everything else assume TYPE_DISK Sector CDB location.
2532          * Use 8-bit sector value.
2533          */
2534 type_disk:
2535         return (u32)cdb[4];
2536 }
2537
2538 static inline u32 transport_get_sectors_10(
2539         unsigned char *cdb,
2540         struct se_cmd *cmd,
2541         int *ret)
2542 {
2543         struct se_device *dev = cmd->se_dev;
2544
2545         /*
2546          * Assume TYPE_DISK for non struct se_device objects.
2547          * Use 16-bit sector value.
2548          */
2549         if (!dev)
2550                 goto type_disk;
2551
2552         /*
2553          * XXX_10 is not defined in SSC, throw an exception
2554          */
2555         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2556                 *ret = -EINVAL;
2557                 return 0;
2558         }
2559
2560         /*
2561          * Everything else assume TYPE_DISK Sector CDB location.
2562          * Use 16-bit sector value.
2563          */
2564 type_disk:
2565         return (u32)(cdb[7] << 8) + cdb[8];
2566 }
2567
2568 static inline u32 transport_get_sectors_12(
2569         unsigned char *cdb,
2570         struct se_cmd *cmd,
2571         int *ret)
2572 {
2573         struct se_device *dev = cmd->se_dev;
2574
2575         /*
2576          * Assume TYPE_DISK for non struct se_device objects.
2577          * Use 32-bit sector value.
2578          */
2579         if (!dev)
2580                 goto type_disk;
2581
2582         /*
2583          * XXX_12 is not defined in SSC, throw an exception
2584          */
2585         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2586                 *ret = -EINVAL;
2587                 return 0;
2588         }
2589
2590         /*
2591          * Everything else assume TYPE_DISK Sector CDB location.
2592          * Use 32-bit sector value.
2593          */
2594 type_disk:
2595         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2596 }
2597
2598 static inline u32 transport_get_sectors_16(
2599         unsigned char *cdb,
2600         struct se_cmd *cmd,
2601         int *ret)
2602 {
2603         struct se_device *dev = cmd->se_dev;
2604
2605         /*
2606          * Assume TYPE_DISK for non struct se_device objects.
2607          * Use 32-bit sector value.
2608          */
2609         if (!dev)
2610                 goto type_disk;
2611
2612         /*
2613          * Use 24-bit allocation length for TYPE_TAPE.
2614          */
2615         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2616                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2617
2618 type_disk:
2619         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2620                     (cdb[12] << 8) + cdb[13];
2621 }
2622
2623 /*
2624  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2625  */
2626 static inline u32 transport_get_sectors_32(
2627         unsigned char *cdb,
2628         struct se_cmd *cmd,
2629         int *ret)
2630 {
2631         /*
2632          * Assume TYPE_DISK for non struct se_device objects.
2633          * Use 32-bit sector value.
2634          */
2635         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2636                     (cdb[30] << 8) + cdb[31];
2637
2638 }
2639
2640 static inline u32 transport_get_size(
2641         u32 sectors,
2642         unsigned char *cdb,
2643         struct se_cmd *cmd)
2644 {
2645         struct se_device *dev = cmd->se_dev;
2646
2647         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2648                 if (cdb[1] & 1) { /* sectors */
2649                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2650                 } else /* bytes */
2651                         return sectors;
2652         }
2653 #if 0
2654         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2655                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2656                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2657                         dev->transport->name);
2658 #endif
2659         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2660 }
2661
2662 unsigned char transport_asciihex_to_binaryhex(unsigned char val[2])
2663 {
2664         unsigned char result = 0;
2665         /*
2666          * MSB
2667          */
2668         if ((val[0] >= 'a') && (val[0] <= 'f'))
2669                 result = ((val[0] - 'a' + 10) & 0xf) << 4;
2670         else
2671                 if ((val[0] >= 'A') && (val[0] <= 'F'))
2672                         result = ((val[0] - 'A' + 10) & 0xf) << 4;
2673                 else /* digit */
2674                         result = ((val[0] - '0') & 0xf) << 4;
2675         /*
2676          * LSB
2677          */
2678         if ((val[1] >= 'a') && (val[1] <= 'f'))
2679                 result |= ((val[1] - 'a' + 10) & 0xf);
2680         else
2681                 if ((val[1] >= 'A') && (val[1] <= 'F'))
2682                         result |= ((val[1] - 'A' + 10) & 0xf);
2683                 else /* digit */
2684                         result |= ((val[1] - '0') & 0xf);
2685
2686         return result;
2687 }
2688 EXPORT_SYMBOL(transport_asciihex_to_binaryhex);
2689
2690 static void transport_xor_callback(struct se_cmd *cmd)
2691 {
2692         unsigned char *buf, *addr;
2693         struct scatterlist *sg;
2694         unsigned int offset;
2695         int i;
2696         int count;
2697         /*
2698          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2699          *
2700          * 1) read the specified logical block(s);
2701          * 2) transfer logical blocks from the data-out buffer;
2702          * 3) XOR the logical blocks transferred from the data-out buffer with
2703          *    the logical blocks read, storing the resulting XOR data in a buffer;
2704          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2705          *    blocks transferred from the data-out buffer; and
2706          * 5) transfer the resulting XOR data to the data-in buffer.
2707          */
2708         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2709         if (!buf) {
2710                 pr_err("Unable to allocate xor_callback buf\n");
2711                 return;
2712         }
2713         /*
2714          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2715          * into the locally allocated *buf
2716          */
2717         sg_copy_to_buffer(cmd->t_data_sg,
2718                           cmd->t_data_nents,
2719                           buf,
2720                           cmd->data_length);
2721
2722         /*
2723          * Now perform the XOR against the BIDI read memory located at
2724          * cmd->t_mem_bidi_list
2725          */
2726
2727         offset = 0;
2728         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2729                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2730                 if (!addr)
2731                         goto out;
2732
2733                 for (i = 0; i < sg->length; i++)
2734                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2735
2736                 offset += sg->length;
2737                 kunmap_atomic(addr, KM_USER0);
2738         }
2739
2740 out:
2741         kfree(buf);
2742 }
2743
2744 /*
2745  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2746  */
2747 static int transport_get_sense_data(struct se_cmd *cmd)
2748 {
2749         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2750         struct se_device *dev;
2751         struct se_task *task = NULL, *task_tmp;
2752         unsigned long flags;
2753         u32 offset = 0;
2754
2755         WARN_ON(!cmd->se_lun);
2756
2757         spin_lock_irqsave(&cmd->t_state_lock, flags);
2758         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2759                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2760                 return 0;
2761         }
2762
2763         list_for_each_entry_safe(task, task_tmp,
2764                                 &cmd->t_task_list, t_list) {
2765
2766                 if (!task->task_sense)
2767                         continue;
2768
2769                 dev = task->se_dev;
2770                 if (!dev)
2771                         continue;
2772
2773                 if (!dev->transport->get_sense_buffer) {
2774                         pr_err("dev->transport->get_sense_buffer"
2775                                         " is NULL\n");
2776                         continue;
2777                 }
2778
2779                 sense_buffer = dev->transport->get_sense_buffer(task);
2780                 if (!sense_buffer) {
2781                         pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
2782                                 " sense buffer for task with sense\n",
2783                                 cmd->se_tfo->get_task_tag(cmd), task->task_no);
2784                         continue;
2785                 }
2786                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2787
2788                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2789                                 TRANSPORT_SENSE_BUFFER);
2790
2791                 memcpy(&buffer[offset], sense_buffer,
2792                                 TRANSPORT_SENSE_BUFFER);
2793                 cmd->scsi_status = task->task_scsi_status;
2794                 /* Automatically padded */
2795                 cmd->scsi_sense_length =
2796                                 (TRANSPORT_SENSE_BUFFER + offset);
2797
2798                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2799                                 " and sense\n",
2800                         dev->se_hba->hba_id, dev->transport->name,
2801                                 cmd->scsi_status);
2802                 return 0;
2803         }
2804         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2805
2806         return -1;
2807 }
2808
2809 static int
2810 transport_handle_reservation_conflict(struct se_cmd *cmd)
2811 {
2812         cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2813         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2814         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2815         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2816         /*
2817          * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2818          * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2819          * CONFLICT STATUS.
2820          *
2821          * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2822          */
2823         if (cmd->se_sess &&
2824             cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2825                 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2826                         cmd->orig_fe_lun, 0x2C,
2827                         ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2828         return -EINVAL;
2829 }
2830
2831 static inline long long transport_dev_end_lba(struct se_device *dev)
2832 {
2833         return dev->transport->get_blocks(dev) + 1;
2834 }
2835
2836 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2837 {
2838         struct se_device *dev = cmd->se_dev;
2839         u32 sectors;
2840
2841         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2842                 return 0;
2843
2844         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2845
2846         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2847                 pr_err("LBA: %llu Sectors: %u exceeds"
2848                         " transport_dev_end_lba(): %llu\n",
2849                         cmd->t_task_lba, sectors,
2850                         transport_dev_end_lba(dev));
2851                 pr_err("  We should return CHECK_CONDITION"
2852                        " but we don't yet\n");
2853                 return 0;
2854         }
2855
2856         return sectors;
2857 }
2858
2859 /*      transport_generic_cmd_sequencer():
2860  *
2861  *      Generic Command Sequencer that should work for most DAS transport
2862  *      drivers.
2863  *
2864  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2865  *      RX Thread.
2866  *
2867  *      FIXME: Need to support other SCSI OPCODES where as well.
2868  */
2869 static int transport_generic_cmd_sequencer(
2870         struct se_cmd *cmd,
2871         unsigned char *cdb)
2872 {
2873         struct se_device *dev = cmd->se_dev;
2874         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2875         int ret = 0, sector_ret = 0, passthrough;
2876         u32 sectors = 0, size = 0, pr_reg_type = 0;
2877         u16 service_action;
2878         u8 alua_ascq = 0;
2879         /*
2880          * Check for an existing UNIT ATTENTION condition
2881          */
2882         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2883                 cmd->transport_wait_for_tasks =
2884                                 &transport_nop_wait_for_tasks;
2885                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2886                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2887                 return -EINVAL;
2888         }
2889         /*
2890          * Check status of Asymmetric Logical Unit Assignment port
2891          */
2892         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2893         if (ret != 0) {
2894                 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
2895                 /*
2896                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2897                  * The ALUA additional sense code qualifier (ASCQ) is determined
2898                  * by the ALUA primary or secondary access state..
2899                  */
2900                 if (ret > 0) {
2901 #if 0
2902                         pr_debug("[%s]: ALUA TG Port not available,"
2903                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2904                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2905 #endif
2906                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2907                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2908                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2909                         return -EINVAL;
2910                 }
2911                 goto out_invalid_cdb_field;
2912         }
2913         /*
2914          * Check status for SPC-3 Persistent Reservations
2915          */
2916         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2917                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2918                                         cmd, cdb, pr_reg_type) != 0)
2919                         return transport_handle_reservation_conflict(cmd);
2920                 /*
2921                  * This means the CDB is allowed for the SCSI Initiator port
2922                  * when said port is *NOT* holding the legacy SPC-2 or
2923                  * SPC-3 Persistent Reservation.
2924                  */
2925         }
2926
2927         switch (cdb[0]) {
2928         case READ_6:
2929                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2930                 if (sector_ret)
2931                         goto out_unsupported_cdb;
2932                 size = transport_get_size(sectors, cdb, cmd);
2933                 cmd->transport_split_cdb = &split_cdb_XX_6;
2934                 cmd->t_task_lba = transport_lba_21(cdb);
2935                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2936                 break;
2937         case READ_10:
2938                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2939                 if (sector_ret)
2940                         goto out_unsupported_cdb;
2941                 size = transport_get_size(sectors, cdb, cmd);
2942                 cmd->transport_split_cdb = &split_cdb_XX_10;
2943                 cmd->t_task_lba = transport_lba_32(cdb);
2944                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2945                 break;
2946         case READ_12:
2947                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2948                 if (sector_ret)
2949                         goto out_unsupported_cdb;
2950                 size = transport_get_size(sectors, cdb, cmd);
2951                 cmd->transport_split_cdb = &split_cdb_XX_12;
2952                 cmd->t_task_lba = transport_lba_32(cdb);
2953                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2954                 break;
2955         case READ_16:
2956                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2957                 if (sector_ret)
2958                         goto out_unsupported_cdb;
2959                 size = transport_get_size(sectors, cdb, cmd);
2960                 cmd->transport_split_cdb = &split_cdb_XX_16;
2961                 cmd->t_task_lba = transport_lba_64(cdb);
2962                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2963                 break;
2964         case WRITE_6:
2965                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2966                 if (sector_ret)
2967                         goto out_unsupported_cdb;
2968                 size = transport_get_size(sectors, cdb, cmd);
2969                 cmd->transport_split_cdb = &split_cdb_XX_6;
2970                 cmd->t_task_lba = transport_lba_21(cdb);
2971                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2972                 break;
2973         case WRITE_10:
2974                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2975                 if (sector_ret)
2976                         goto out_unsupported_cdb;
2977                 size = transport_get_size(sectors, cdb, cmd);
2978                 cmd->transport_split_cdb = &split_cdb_XX_10;
2979                 cmd->t_task_lba = transport_lba_32(cdb);
2980                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2981                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2982                 break;
2983         case WRITE_12:
2984                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2985                 if (sector_ret)
2986                         goto out_unsupported_cdb;
2987                 size = transport_get_size(sectors, cdb, cmd);
2988                 cmd->transport_split_cdb = &split_cdb_XX_12;
2989                 cmd->t_task_lba = transport_lba_32(cdb);
2990                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2991                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2992                 break;
2993         case WRITE_16:
2994                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2995                 if (sector_ret)
2996                         goto out_unsupported_cdb;
2997                 size = transport_get_size(sectors, cdb, cmd);
2998                 cmd->transport_split_cdb = &split_cdb_XX_16;
2999                 cmd->t_task_lba = transport_lba_64(cdb);
3000                 cmd->t_tasks_fua = (cdb[1] & 0x8);
3001                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3002                 break;
3003         case XDWRITEREAD_10:
3004                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
3005                     !(cmd->t_tasks_bidi))
3006                         goto out_invalid_cdb_field;
3007                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3008                 if (sector_ret)
3009                         goto out_unsupported_cdb;
3010                 size = transport_get_size(sectors, cdb, cmd);
3011                 cmd->transport_split_cdb = &split_cdb_XX_10;
3012                 cmd->t_task_lba = transport_lba_32(cdb);
3013                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3014                 passthrough = (dev->transport->transport_type ==
3015                                 TRANSPORT_PLUGIN_PHBA_PDEV);
3016                 /*
3017                  * Skip the remaining assignments for TCM/PSCSI passthrough
3018                  */
3019                 if (passthrough)
3020                         break;
3021                 /*
3022                  * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
3023                  */
3024                 cmd->transport_complete_callback = &transport_xor_callback;
3025                 cmd->t_tasks_fua = (cdb[1] & 0x8);
3026                 break;
3027         case VARIABLE_LENGTH_CMD:
3028                 service_action = get_unaligned_be16(&cdb[8]);
3029                 /*
3030                  * Determine if this is TCM/PSCSI device and we should disable
3031                  * internal emulation for this CDB.
3032                  */
3033                 passthrough = (dev->transport->transport_type ==
3034                                         TRANSPORT_PLUGIN_PHBA_PDEV);
3035
3036                 switch (service_action) {
3037                 case XDWRITEREAD_32:
3038                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3039                         if (sector_ret)
3040                                 goto out_unsupported_cdb;
3041                         size = transport_get_size(sectors, cdb, cmd);
3042                         /*
3043                          * Use WRITE_32 and READ_32 opcodes for the emulated
3044                          * XDWRITE_READ_32 logic.
3045                          */
3046                         cmd->transport_split_cdb = &split_cdb_XX_32;
3047                         cmd->t_task_lba = transport_lba_64_ext(cdb);
3048                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
3049
3050                         /*
3051                          * Skip the remaining assignments for TCM/PSCSI passthrough
3052                          */
3053                         if (passthrough)
3054                                 break;
3055
3056                         /*
3057                          * Setup BIDI XOR callback to be run during
3058                          * transport_generic_complete_ok()
3059                          */
3060                         cmd->transport_complete_callback = &transport_xor_callback;
3061                         cmd->t_tasks_fua = (cdb[10] & 0x8);
3062                         break;
3063                 case WRITE_SAME_32:
3064                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
3065                         if (sector_ret)
3066                                 goto out_unsupported_cdb;
3067
3068                         if (sectors)
3069                                 size = transport_get_size(sectors, cdb, cmd);
3070                         else {
3071                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
3072                                        " supported\n");
3073                                 goto out_invalid_cdb_field;
3074                         }
3075
3076                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
3077                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3078
3079                         /*
3080                          * Skip the remaining assignments for TCM/PSCSI passthrough
3081                          */
3082                         if (passthrough)
3083                                 break;
3084
3085                         if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) {
3086                                 pr_err("WRITE_SAME PBDATA and LBDATA"
3087                                         " bits not supported for Block Discard"
3088                                         " Emulation\n");
3089                                 goto out_invalid_cdb_field;
3090                         }
3091                         /*
3092                          * Currently for the emulated case we only accept
3093                          * tpws with the UNMAP=1 bit set.
3094                          */
3095                         if (!(cdb[10] & 0x08)) {
3096                                 pr_err("WRITE_SAME w/o UNMAP bit not"
3097                                         " supported for Block Discard Emulation\n");
3098                                 goto out_invalid_cdb_field;
3099                         }
3100                         break;
3101                 default:
3102                         pr_err("VARIABLE_LENGTH_CMD service action"
3103                                 " 0x%04x not supported\n", service_action);
3104                         goto out_unsupported_cdb;
3105                 }
3106                 break;
3107         case MAINTENANCE_IN:
3108                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3109                         /* MAINTENANCE_IN from SCC-2 */
3110                         /*
3111                          * Check for emulated MI_REPORT_TARGET_PGS.
3112                          */
3113                         if (cdb[1] == MI_REPORT_TARGET_PGS) {
3114                                 cmd->transport_emulate_cdb =
3115                                 (su_dev->t10_alua.alua_type ==
3116                                  SPC3_ALUA_EMULATED) ?
3117                                 core_emulate_report_target_port_groups :
3118                                 NULL;
3119                         }
3120                         size = (cdb[6] << 24) | (cdb[7] << 16) |
3121                                (cdb[8] << 8) | cdb[9];
3122                 } else {
3123                         /* GPCMD_SEND_KEY from multi media commands */
3124                         size = (cdb[8] << 8) + cdb[9];
3125                 }
3126                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3127                 break;
3128         case MODE_SELECT:
3129                 size = cdb[4];
3130                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3131                 break;
3132         case MODE_SELECT_10:
3133                 size = (cdb[7] << 8) + cdb[8];
3134                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3135                 break;
3136         case MODE_SENSE:
3137                 size = cdb[4];
3138                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3139                 break;
3140         case MODE_SENSE_10:
3141         case GPCMD_READ_BUFFER_CAPACITY:
3142         case GPCMD_SEND_OPC:
3143         case LOG_SELECT:
3144         case LOG_SENSE:
3145                 size = (cdb[7] << 8) + cdb[8];
3146                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3147                 break;
3148         case READ_BLOCK_LIMITS:
3149                 size = READ_BLOCK_LEN;
3150                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3151                 break;
3152         case GPCMD_GET_CONFIGURATION:
3153         case GPCMD_READ_FORMAT_CAPACITIES:
3154         case GPCMD_READ_DISC_INFO:
3155         case GPCMD_READ_TRACK_RZONE_INFO:
3156                 size = (cdb[7] << 8) + cdb[8];
3157                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3158                 break;
3159         case PERSISTENT_RESERVE_IN:
3160         case PERSISTENT_RESERVE_OUT:
3161                 cmd->transport_emulate_cdb =
3162                         (su_dev->t10_pr.res_type ==
3163                          SPC3_PERSISTENT_RESERVATIONS) ?
3164                         core_scsi3_emulate_pr : NULL;
3165                 size = (cdb[7] << 8) + cdb[8];
3166                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3167                 break;
3168         case GPCMD_MECHANISM_STATUS:
3169         case GPCMD_READ_DVD_STRUCTURE:
3170                 size = (cdb[8] << 8) + cdb[9];
3171                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3172                 break;
3173         case READ_POSITION:
3174                 size = READ_POSITION_LEN;
3175                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3176                 break;
3177         case MAINTENANCE_OUT:
3178                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3179                         /* MAINTENANCE_OUT from SCC-2
3180                          *
3181                          * Check for emulated MO_SET_TARGET_PGS.
3182                          */
3183                         if (cdb[1] == MO_SET_TARGET_PGS) {
3184                                 cmd->transport_emulate_cdb =
3185                                 (su_dev->t10_alua.alua_type ==
3186                                         SPC3_ALUA_EMULATED) ?
3187                                 core_emulate_set_target_port_groups :
3188                                 NULL;
3189                         }
3190
3191                         size = (cdb[6] << 24) | (cdb[7] << 16) |
3192                                (cdb[8] << 8) | cdb[9];
3193                 } else  {
3194                         /* GPCMD_REPORT_KEY from multi media commands */
3195                         size = (cdb[8] << 8) + cdb[9];
3196                 }
3197                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3198                 break;
3199         case INQUIRY:
3200                 size = (cdb[3] << 8) + cdb[4];
3201                 /*
3202                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3203                  * See spc4r17 section 5.3
3204                  */
3205                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3206                         cmd->sam_task_attr = MSG_HEAD_TAG;
3207                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3208                 break;
3209         case READ_BUFFER:
3210                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3211                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3212                 break;
3213         case READ_CAPACITY:
3214                 size = READ_CAP_LEN;
3215                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3216                 break;
3217         case READ_MEDIA_SERIAL_NUMBER:
3218         case SECURITY_PROTOCOL_IN:
3219         case SECURITY_PROTOCOL_OUT:
3220                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3221                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3222                 break;
3223         case SERVICE_ACTION_IN:
3224         case ACCESS_CONTROL_IN:
3225         case ACCESS_CONTROL_OUT:
3226         case EXTENDED_COPY:
3227         case READ_ATTRIBUTE:
3228         case RECEIVE_COPY_RESULTS:
3229         case WRITE_ATTRIBUTE:
3230                 size = (cdb[10] << 24) | (cdb[11] << 16) |
3231                        (cdb[12] << 8) | cdb[13];
3232                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3233                 break;
3234         case RECEIVE_DIAGNOSTIC:
3235         case SEND_DIAGNOSTIC:
3236                 size = (cdb[3] << 8) | cdb[4];
3237                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3238                 break;
3239 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3240 #if 0
3241         case GPCMD_READ_CD:
3242                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3243                 size = (2336 * sectors);
3244                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3245                 break;
3246 #endif
3247         case READ_TOC:
3248                 size = cdb[8];
3249                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3250                 break;
3251         case REQUEST_SENSE:
3252                 size = cdb[4];
3253                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3254                 break;
3255         case READ_ELEMENT_STATUS:
3256                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3257                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3258                 break;
3259         case WRITE_BUFFER:
3260                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3261                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3262                 break;
3263         case RESERVE:
3264         case RESERVE_10:
3265                 /*
3266                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3267                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3268                  */
3269                 if (cdb[0] == RESERVE_10)
3270                         size = (cdb[7] << 8) | cdb[8];
3271                 else
3272                         size = cmd->data_length;
3273
3274                 /*
3275                  * Setup the legacy emulated handler for SPC-2 and
3276                  * >= SPC-3 compatible reservation handling (CRH=1)
3277                  * Otherwise, we assume the underlying SCSI logic is
3278                  * is running in SPC_PASSTHROUGH, and wants reservations
3279                  * emulation disabled.
3280                  */
3281                 cmd->transport_emulate_cdb =
3282                                 (su_dev->t10_pr.res_type !=
3283                                  SPC_PASSTHROUGH) ?
3284                                 core_scsi2_emulate_crh : NULL;
3285                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3286                 break;
3287         case RELEASE:
3288         case RELEASE_10:
3289                 /*
3290                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3291                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3292                 */
3293                 if (cdb[0] == RELEASE_10)
3294                         size = (cdb[7] << 8) | cdb[8];
3295                 else
3296                         size = cmd->data_length;
3297
3298                 cmd->transport_emulate_cdb =
3299                                 (su_dev->t10_pr.res_type !=
3300                                  SPC_PASSTHROUGH) ?
3301                                 core_scsi2_emulate_crh : NULL;
3302                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3303                 break;
3304         case SYNCHRONIZE_CACHE:
3305         case 0x91: /* SYNCHRONIZE_CACHE_16: */
3306                 /*
3307                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3308                  */
3309                 if (cdb[0] == SYNCHRONIZE_CACHE) {
3310                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3311                         cmd->t_task_lba = transport_lba_32(cdb);
3312                 } else {
3313                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3314                         cmd->t_task_lba = transport_lba_64(cdb);
3315                 }
3316                 if (sector_ret)
3317                         goto out_unsupported_cdb;
3318
3319                 size = transport_get_size(sectors, cdb, cmd);
3320                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3321
3322                 /*
3323                  * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3324                  */
3325                 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3326                         break;
3327                 /*
3328                  * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3329                  * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3330                  */
3331                 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3332                 /*
3333                  * Check to ensure that LBA + Range does not exceed past end of
3334                  * device.
3335                  */
3336                 if (!transport_cmd_get_valid_sectors(cmd))
3337                         goto out_invalid_cdb_field;
3338                 break;
3339         case UNMAP:
3340                 size = get_unaligned_be16(&cdb[7]);
3341                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3342                 break;
3343         case WRITE_SAME_16:
3344                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3345                 if (sector_ret)
3346                         goto out_unsupported_cdb;
3347
3348                 if (sectors)
3349                         size = transport_get_size(sectors, cdb, cmd);
3350                 else {
3351                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3352                         goto out_invalid_cdb_field;
3353                 }
3354
3355                 cmd->t_task_lba = get_unaligned_be16(&cdb[2]);
3356                 passthrough = (dev->transport->transport_type ==
3357                                 TRANSPORT_PLUGIN_PHBA_PDEV);
3358                 /*
3359                  * Determine if the received WRITE_SAME_16 is used to for direct
3360                  * passthrough into Linux/SCSI with struct request via TCM/pSCSI
3361                  * or we are signaling the use of internal WRITE_SAME + UNMAP=1
3362                  * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and
3363                  * TCM/FILEIO subsystem plugin backstores.
3364                  */
3365                 if (!passthrough) {
3366                         if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) {
3367                                 pr_err("WRITE_SAME PBDATA and LBDATA"
3368                                         " bits not supported for Block Discard"
3369                                         " Emulation\n");
3370                                 goto out_invalid_cdb_field;
3371                         }
3372                         /*
3373                          * Currently for the emulated case we only accept
3374                          * tpws with the UNMAP=1 bit set.
3375                          */
3376                         if (!(cdb[1] & 0x08)) {
3377                                 pr_err("WRITE_SAME w/o UNMAP bit not "
3378                                         " supported for Block Discard Emulation\n");
3379                                 goto out_invalid_cdb_field;
3380                         }
3381                 }
3382                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3383                 break;
3384         case ALLOW_MEDIUM_REMOVAL:
3385         case GPCMD_CLOSE_TRACK:
3386         case ERASE:
3387         case INITIALIZE_ELEMENT_STATUS:
3388         case GPCMD_LOAD_UNLOAD:
3389         case REZERO_UNIT:
3390         case SEEK_10:
3391         case GPCMD_SET_SPEED:
3392         case SPACE:
3393         case START_STOP:
3394         case TEST_UNIT_READY:
3395         case VERIFY:
3396         case WRITE_FILEMARKS:
3397         case MOVE_MEDIUM:
3398                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3399                 break;
3400         case REPORT_LUNS:
3401                 cmd->transport_emulate_cdb =
3402                                 transport_core_report_lun_response;
3403                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3404                 /*
3405                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3406                  * See spc4r17 section 5.3
3407                  */
3408                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3409                         cmd->sam_task_attr = MSG_HEAD_TAG;
3410                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3411                 break;
3412         default:
3413                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3414                         " 0x%02x, sending CHECK_CONDITION.\n",
3415                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3416                 cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
3417                 goto out_unsupported_cdb;
3418         }
3419
3420         if (size != cmd->data_length) {
3421                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3422                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3423                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3424                                 cmd->data_length, size, cdb[0]);
3425
3426                 cmd->cmd_spdtl = size;
3427
3428                 if (cmd->data_direction == DMA_TO_DEVICE) {
3429                         pr_err("Rejecting underflow/overflow"
3430                                         " WRITE data\n");
3431                         goto out_invalid_cdb_field;
3432                 }
3433                 /*
3434                  * Reject READ_* or WRITE_* with overflow/underflow for
3435                  * type SCF_SCSI_DATA_SG_IO_CDB.
3436                  */
3437                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3438                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3439                                 " CDB on non 512-byte sector setup subsystem"
3440                                 " plugin: %s\n", dev->transport->name);
3441                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3442                         goto out_invalid_cdb_field;
3443                 }
3444
3445                 if (size > cmd->data_length) {
3446                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3447                         cmd->residual_count = (size - cmd->data_length);
3448                 } else {
3449                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3450                         cmd->residual_count = (cmd->data_length - size);
3451                 }
3452                 cmd->data_length = size;
3453         }
3454
3455         /* Let's limit control cdbs to a page, for simplicity's sake. */
3456         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3457             size > PAGE_SIZE)
3458                 goto out_invalid_cdb_field;
3459
3460         transport_set_supported_SAM_opcode(cmd);
3461         return ret;
3462
3463 out_unsupported_cdb:
3464         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3465         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3466         return -EINVAL;
3467 out_invalid_cdb_field:
3468         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3469         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3470         return -EINVAL;
3471 }
3472
3473 /*
3474  * Called from transport_generic_complete_ok() and
3475  * transport_generic_request_failure() to determine which dormant/delayed
3476  * and ordered cmds need to have their tasks added to the execution queue.
3477  */
3478 static void transport_complete_task_attr(struct se_cmd *cmd)
3479 {
3480         struct se_device *dev = cmd->se_dev;
3481         struct se_cmd *cmd_p, *cmd_tmp;
3482         int new_active_tasks = 0;
3483
3484         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3485                 atomic_dec(&dev->simple_cmds);
3486                 smp_mb__after_atomic_dec();
3487                 dev->dev_cur_ordered_id++;
3488                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3489                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3490                         cmd->se_ordered_id);
3491         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3492                 atomic_dec(&dev->dev_hoq_count);
3493                 smp_mb__after_atomic_dec();
3494                 dev->dev_cur_ordered_id++;
3495                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3496                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3497                         cmd->se_ordered_id);
3498         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3499                 spin_lock(&dev->ordered_cmd_lock);
3500                 list_del(&cmd->se_ordered_node);
3501                 atomic_dec(&dev->dev_ordered_sync);
3502                 smp_mb__after_atomic_dec();
3503                 spin_unlock(&dev->ordered_cmd_lock);
3504
3505                 dev->dev_cur_ordered_id++;
3506                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3507                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3508         }
3509         /*
3510          * Process all commands up to the last received
3511          * ORDERED task attribute which requires another blocking
3512          * boundary
3513          */
3514         spin_lock(&dev->delayed_cmd_lock);
3515         list_for_each_entry_safe(cmd_p, cmd_tmp,
3516                         &dev->delayed_cmd_list, se_delayed_node) {
3517
3518                 list_del(&cmd_p->se_delayed_node);
3519                 spin_unlock(&dev->delayed_cmd_lock);
3520
3521                 pr_debug("Calling add_tasks() for"
3522                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3523                         " Dormant -> Active, se_ordered_id: %u\n",
3524                         cmd_p->t_task_cdb[0],
3525                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3526
3527                 transport_add_tasks_from_cmd(cmd_p);
3528                 new_active_tasks++;
3529
3530                 spin_lock(&dev->delayed_cmd_lock);
3531                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3532                         break;
3533         }
3534         spin_unlock(&dev->delayed_cmd_lock);
3535         /*
3536          * If new tasks have become active, wake up the transport thread
3537          * to do the processing of the Active tasks.
3538          */
3539         if (new_active_tasks != 0)
3540                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3541 }
3542
3543 static int transport_complete_qf(struct se_cmd *cmd)
3544 {
3545         int ret = 0;
3546
3547         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
3548                 return cmd->se_tfo->queue_status(cmd);
3549
3550         switch (cmd->data_direction) {
3551         case DMA_FROM_DEVICE:
3552                 ret = cmd->se_tfo->queue_data_in(cmd);
3553                 break;
3554         case DMA_TO_DEVICE:
3555                 if (cmd->t_bidi_data_sg) {
3556                         ret = cmd->se_tfo->queue_data_in(cmd);
3557                         if (ret < 0)
3558                                 return ret;
3559                 }
3560                 /* Fall through for DMA_TO_DEVICE */
3561         case DMA_NONE:
3562                 ret = cmd->se_tfo->queue_status(cmd);
3563                 break;
3564         default:
3565                 break;
3566         }
3567
3568         return ret;
3569 }
3570
3571 static void transport_handle_queue_full(
3572         struct se_cmd *cmd,
3573         struct se_device *dev,
3574         int (*qf_callback)(struct se_cmd *))
3575 {
3576         spin_lock_irq(&dev->qf_cmd_lock);
3577         cmd->se_cmd_flags |= SCF_EMULATE_QUEUE_FULL;
3578         cmd->transport_qf_callback = qf_callback;
3579         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3580         atomic_inc(&dev->dev_qf_count);
3581         smp_mb__after_atomic_inc();
3582         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3583
3584         schedule_work(&cmd->se_dev->qf_work_queue);
3585 }
3586
3587 static void transport_generic_complete_ok(struct se_cmd *cmd)
3588 {
3589         int reason = 0, ret;
3590         /*
3591          * Check if we need to move delayed/dormant tasks from cmds on the
3592          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3593          * Attribute.
3594          */
3595         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3596                 transport_complete_task_attr(cmd);
3597         /*
3598          * Check to schedule QUEUE_FULL work, or execute an existing
3599          * cmd->transport_qf_callback()
3600          */
3601         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3602                 schedule_work(&cmd->se_dev->qf_work_queue);
3603
3604         if (cmd->transport_qf_callback) {
3605                 ret = cmd->transport_qf_callback(cmd);
3606                 if (ret < 0)
3607                         goto queue_full;
3608
3609                 cmd->transport_qf_callback = NULL;
3610                 goto done;
3611         }
3612         /*
3613          * Check if we need to retrieve a sense buffer from
3614          * the struct se_cmd in question.
3615          */
3616         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3617                 if (transport_get_sense_data(cmd) < 0)
3618                         reason = TCM_NON_EXISTENT_LUN;
3619
3620                 /*
3621                  * Only set when an struct se_task->task_scsi_status returned
3622                  * a non GOOD status.
3623                  */
3624                 if (cmd->scsi_status) {
3625                         ret = transport_send_check_condition_and_sense(
3626                                         cmd, reason, 1);
3627                         if (ret == -EAGAIN)
3628                                 goto queue_full;
3629
3630                         transport_lun_remove_cmd(cmd);
3631                         transport_cmd_check_stop_to_fabric(cmd);
3632                         return;
3633                 }
3634         }
3635         /*
3636          * Check for a callback, used by amongst other things
3637          * XDWRITE_READ_10 emulation.
3638          */
3639         if (cmd->transport_complete_callback)
3640                 cmd->transport_complete_callback(cmd);
3641
3642         switch (cmd->data_direction) {
3643         case DMA_FROM_DEVICE:
3644                 spin_lock(&cmd->se_lun->lun_sep_lock);
3645                 if (cmd->se_lun->lun_sep) {
3646                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3647                                         cmd->data_length;
3648                 }
3649                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3650
3651                 ret = cmd->se_tfo->queue_data_in(cmd);
3652                 if (ret == -EAGAIN)
3653                         goto queue_full;
3654                 break;
3655         case DMA_TO_DEVICE:
3656                 spin_lock(&cmd->se_lun->lun_sep_lock);
3657                 if (cmd->se_lun->lun_sep) {
3658                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3659                                 cmd->data_length;
3660                 }
3661                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3662                 /*
3663                  * Check if we need to send READ payload for BIDI-COMMAND
3664                  */
3665                 if (cmd->t_bidi_data_sg) {
3666                         spin_lock(&cmd->se_lun->lun_sep_lock);
3667                         if (cmd->se_lun->lun_sep) {
3668                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3669                                         cmd->data_length;
3670                         }
3671                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3672                         ret = cmd->se_tfo->queue_data_in(cmd);
3673                         if (ret == -EAGAIN)
3674                                 goto queue_full;
3675                         break;
3676                 }
3677                 /* Fall through for DMA_TO_DEVICE */
3678         case DMA_NONE:
3679                 ret = cmd->se_tfo->queue_status(cmd);
3680                 if (ret == -EAGAIN)
3681                         goto queue_full;
3682                 break;
3683         default:
3684                 break;
3685         }
3686
3687 done:
3688         transport_lun_remove_cmd(cmd);
3689         transport_cmd_check_stop_to_fabric(cmd);
3690         return;
3691
3692 queue_full:
3693         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3694                 " data_direction: %d\n", cmd, cmd->data_direction);
3695         transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
3696 }
3697
3698 static void transport_free_dev_tasks(struct se_cmd *cmd)
3699 {
3700         struct se_task *task, *task_tmp;
3701         unsigned long flags;
3702
3703         spin_lock_irqsave(&cmd->t_state_lock, flags);
3704         list_for_each_entry_safe(task, task_tmp,
3705                                 &cmd->t_task_list, t_list) {
3706                 if (atomic_read(&task->task_active))
3707                         continue;
3708
3709                 kfree(task->task_sg_bidi);
3710                 kfree(task->task_sg);
3711
3712                 list_del(&task->t_list);
3713
3714                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3715                 if (task->se_dev)
3716                         task->se_dev->transport->free_task(task);
3717                 else
3718                         pr_err("task[%u] - task->se_dev is NULL\n",
3719                                 task->task_no);
3720                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3721         }
3722         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3723 }
3724
3725 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3726 {
3727         struct scatterlist *sg;
3728         int count;
3729
3730         for_each_sg(sgl, sg, nents, count)
3731                 __free_page(sg_page(sg));
3732
3733         kfree(sgl);
3734 }
3735
3736 static inline void transport_free_pages(struct se_cmd *cmd)
3737 {
3738         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3739                 return;
3740
3741         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3742         cmd->t_data_sg = NULL;
3743         cmd->t_data_nents = 0;
3744
3745         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3746         cmd->t_bidi_data_sg = NULL;
3747         cmd->t_bidi_data_nents = 0;
3748 }
3749
3750 static inline void transport_release_tasks(struct se_cmd *cmd)
3751 {
3752         transport_free_dev_tasks(cmd);
3753 }
3754
3755 static inline int transport_dec_and_check(struct se_cmd *cmd)
3756 {
3757         unsigned long flags;
3758
3759         spin_lock_irqsave(&cmd->t_state_lock, flags);
3760         if (atomic_read(&cmd->t_fe_count)) {
3761                 if (!atomic_dec_and_test(&cmd->t_fe_count)) {
3762                         spin_unlock_irqrestore(&cmd->t_state_lock,
3763                                         flags);
3764                         return 1;
3765                 }
3766         }
3767
3768         if (atomic_read(&cmd->t_se_count)) {
3769                 if (!atomic_dec_and_test(&cmd->t_se_count)) {
3770                         spin_unlock_irqrestore(&cmd->t_state_lock,
3771                                         flags);
3772                         return 1;
3773                 }
3774         }
3775         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3776
3777         return 0;
3778 }
3779
3780 static void transport_release_fe_cmd(struct se_cmd *cmd)
3781 {
3782         unsigned long flags;
3783
3784         if (transport_dec_and_check(cmd))
3785                 return;
3786
3787         spin_lock_irqsave(&cmd->t_state_lock, flags);
3788         if (!atomic_read(&cmd->transport_dev_active)) {
3789                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3790                 goto free_pages;
3791         }
3792         atomic_set(&cmd->transport_dev_active, 0);
3793         transport_all_task_dev_remove_state(cmd);
3794         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3795
3796         transport_release_tasks(cmd);
3797 free_pages:
3798         transport_free_pages(cmd);
3799         transport_free_se_cmd(cmd);
3800         cmd->se_tfo->release_cmd(cmd);
3801 }
3802
3803 static int
3804 transport_generic_remove(struct se_cmd *cmd, int session_reinstatement)
3805 {
3806         unsigned long flags;
3807
3808         if (transport_dec_and_check(cmd)) {
3809                 if (session_reinstatement) {
3810                         spin_lock_irqsave(&cmd->t_state_lock, flags);
3811                         transport_all_task_dev_remove_state(cmd);
3812                         spin_unlock_irqrestore(&cmd->t_state_lock,
3813                                         flags);
3814                 }
3815                 return 1;
3816         }
3817
3818         spin_lock_irqsave(&cmd->t_state_lock, flags);
3819         if (!atomic_read(&cmd->transport_dev_active)) {
3820                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3821                 goto free_pages;
3822         }
3823         atomic_set(&cmd->transport_dev_active, 0);
3824         transport_all_task_dev_remove_state(cmd);
3825         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3826
3827         transport_release_tasks(cmd);
3828
3829 free_pages:
3830         transport_free_pages(cmd);
3831         transport_release_cmd(cmd);
3832         return 0;
3833 }
3834
3835 /*
3836  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3837  * allocating in the core.
3838  * @cmd:  Associated se_cmd descriptor
3839  * @mem:  SGL style memory for TCM WRITE / READ
3840  * @sg_mem_num: Number of SGL elements
3841  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3842  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3843  *
3844  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3845  * of parameters.
3846  */
3847 int transport_generic_map_mem_to_cmd(
3848         struct se_cmd *cmd,
3849         struct scatterlist *sgl,
3850         u32 sgl_count,
3851         struct scatterlist *sgl_bidi,
3852         u32 sgl_bidi_count)
3853 {
3854         if (!sgl || !sgl_count)
3855                 return 0;
3856
3857         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3858             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3859
3860                 cmd->t_data_sg = sgl;
3861                 cmd->t_data_nents = sgl_count;
3862
3863                 if (sgl_bidi && sgl_bidi_count) {
3864                         cmd->t_bidi_data_sg = sgl_bidi;
3865                         cmd->t_bidi_data_nents = sgl_bidi_count;
3866                 }
3867                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3868         }
3869
3870         return 0;
3871 }
3872 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3873
3874 static int transport_new_cmd_obj(struct se_cmd *cmd)
3875 {
3876         struct se_device *dev = cmd->se_dev;
3877         u32 task_cdbs;
3878         u32 rc;
3879         int set_counts = 1;
3880
3881         /*
3882          * Setup any BIDI READ tasks and memory from
3883          * cmd->t_mem_bidi_list so the READ struct se_tasks
3884          * are queued first for the non pSCSI passthrough case.
3885          */
3886         if (cmd->t_bidi_data_sg &&
3887             (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3888                 rc = transport_allocate_tasks(cmd,
3889                                               cmd->t_task_lba,
3890                                               DMA_FROM_DEVICE,
3891                                               cmd->t_bidi_data_sg,
3892                                               cmd->t_bidi_data_nents);
3893                 if (rc <= 0) {
3894                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3895                         cmd->scsi_sense_reason =
3896                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3897                         return PYX_TRANSPORT_LU_COMM_FAILURE;
3898                 }
3899                 atomic_inc(&cmd->t_fe_count);
3900                 atomic_inc(&cmd->t_se_count);
3901                 set_counts = 0;
3902         }
3903         /*
3904          * Setup the tasks and memory from cmd->t_mem_list
3905          * Note for BIDI transfers this will contain the WRITE payload
3906          */
3907         task_cdbs = transport_allocate_tasks(cmd,
3908                                              cmd->t_task_lba,
3909                                              cmd->data_direction,
3910                                              cmd->t_data_sg,
3911                                              cmd->t_data_nents);
3912         if (task_cdbs <= 0) {
3913                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3914                 cmd->scsi_sense_reason =
3915                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3916                 return PYX_TRANSPORT_LU_COMM_FAILURE;
3917         }
3918
3919         if (set_counts) {
3920                 atomic_inc(&cmd->t_fe_count);
3921                 atomic_inc(&cmd->t_se_count);
3922         }
3923
3924         cmd->t_task_list_num = task_cdbs;
3925
3926         atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3927         atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3928         atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3929         return 0;
3930 }
3931
3932 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3933 {
3934         struct scatterlist *sg = cmd->t_data_sg;
3935
3936         BUG_ON(!sg);
3937         /*
3938          * We need to take into account a possible offset here for fabrics like
3939          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3940          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3941          */
3942         return kmap(sg_page(sg)) + sg->offset;
3943 }
3944 EXPORT_SYMBOL(transport_kmap_first_data_page);
3945
3946 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3947 {
3948         kunmap(sg_page(cmd->t_data_sg));
3949 }
3950 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3951
3952 static int
3953 transport_generic_get_mem(struct se_cmd *cmd)
3954 {
3955         u32 length = cmd->data_length;
3956         unsigned int nents;
3957         struct page *page;
3958         int i = 0;
3959
3960         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3961         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3962         if (!cmd->t_data_sg)
3963                 return -ENOMEM;
3964
3965         cmd->t_data_nents = nents;
3966         sg_init_table(cmd->t_data_sg, nents);
3967
3968         while (length) {
3969                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3970                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3971                 if (!page)
3972                         goto out;
3973
3974                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3975                 length -= page_len;
3976                 i++;
3977         }
3978         return 0;
3979
3980 out:
3981         while (i >= 0) {
3982                 __free_page(sg_page(&cmd->t_data_sg[i]));
3983                 i--;
3984         }
3985         kfree(cmd->t_data_sg);
3986         cmd->t_data_sg = NULL;
3987         return -ENOMEM;
3988 }
3989
3990 /* Reduce sectors if they are too long for the device */
3991 static inline sector_t transport_limit_task_sectors(
3992         struct se_device *dev,
3993         unsigned long long lba,
3994         sector_t sectors)
3995 {
3996         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3997
3998         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3999                 if ((lba + sectors) > transport_dev_end_lba(dev))
4000                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
4001
4002         return sectors;
4003 }
4004
4005
4006 /*
4007  * This function can be used by HW target mode drivers to create a linked
4008  * scatterlist from all contiguously allocated struct se_task->task_sg[].
4009  * This is intended to be called during the completion path by TCM Core
4010  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
4011  */
4012 void transport_do_task_sg_chain(struct se_cmd *cmd)
4013 {
4014         struct scatterlist *sg_first = NULL;
4015         struct scatterlist *sg_prev = NULL;
4016         int sg_prev_nents = 0;
4017         struct scatterlist *sg;
4018         struct se_task *task;
4019         u32 chained_nents = 0;
4020         int i;
4021
4022         BUG_ON(!cmd->se_tfo->task_sg_chaining);
4023
4024         /*
4025          * Walk the struct se_task list and setup scatterlist chains
4026          * for each contiguously allocated struct se_task->task_sg[].
4027          */
4028         list_for_each_entry(task, &cmd->t_task_list, t_list) {
4029                 if (!task->task_sg)
4030                         continue;
4031
4032                 BUG_ON(!task->task_padded_sg);
4033
4034                 if (!sg_first) {
4035                         sg_first = task->task_sg;
4036                         chained_nents = task->task_sg_nents;
4037                 } else {
4038                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
4039                         chained_nents += task->task_sg_nents;
4040                 }
4041
4042                 sg_prev = task->task_sg;
4043                 sg_prev_nents = task->task_sg_nents;
4044         }
4045         /*
4046          * Setup the starting pointer and total t_tasks_sg_linked_no including
4047          * padding SGs for linking and to mark the end.
4048          */
4049         cmd->t_tasks_sg_chained = sg_first;
4050         cmd->t_tasks_sg_chained_no = chained_nents;
4051
4052         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
4053                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
4054                 cmd->t_tasks_sg_chained_no);
4055
4056         for_each_sg(cmd->t_tasks_sg_chained, sg,
4057                         cmd->t_tasks_sg_chained_no, i) {
4058
4059                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
4060                         i, sg, sg_page(sg), sg->length, sg->offset);
4061                 if (sg_is_chain(sg))
4062                         pr_debug("SG: %p sg_is_chain=1\n", sg);
4063                 if (sg_is_last(sg))
4064                         pr_debug("SG: %p sg_is_last=1\n", sg);
4065         }
4066 }
4067 EXPORT_SYMBOL(transport_do_task_sg_chain);
4068
4069 /*
4070  * Break up cmd into chunks transport can handle
4071  */
4072 static int transport_allocate_data_tasks(
4073         struct se_cmd *cmd,
4074         unsigned long long lba,
4075         enum dma_data_direction data_direction,
4076         struct scatterlist *sgl,
4077         unsigned int sgl_nents)
4078 {
4079         unsigned char *cdb = NULL;
4080         struct se_task *task;
4081         struct se_device *dev = cmd->se_dev;
4082         unsigned long flags;
4083         sector_t sectors;
4084         int task_count, i, ret;
4085         sector_t dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
4086         u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
4087         struct scatterlist *sg;
4088         struct scatterlist *cmd_sg;
4089
4090         WARN_ON(cmd->data_length % sector_size);
4091         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
4092         task_count = DIV_ROUND_UP(sectors, dev_max_sectors);
4093
4094         cmd_sg = sgl;
4095         for (i = 0; i < task_count; i++) {
4096                 unsigned int task_size;
4097                 int count;
4098
4099                 task = transport_generic_get_task(cmd, data_direction);
4100                 if (!task)
4101                         return -ENOMEM;
4102
4103                 task->task_lba = lba;
4104                 task->task_sectors = min(sectors, dev_max_sectors);
4105                 task->task_size = task->task_sectors * sector_size;
4106
4107                 cdb = dev->transport->get_cdb(task);
4108                 BUG_ON(!cdb);
4109
4110                 memcpy(cdb, cmd->t_task_cdb,
4111                        scsi_command_size(cmd->t_task_cdb));
4112
4113                 /* Update new cdb with updated lba/sectors */
4114                 cmd->transport_split_cdb(task->task_lba, task->task_sectors, cdb);
4115
4116                 /*
4117                  * Check if the fabric module driver is requesting that all
4118                  * struct se_task->task_sg[] be chained together..  If so,
4119                  * then allocate an extra padding SG entry for linking and
4120                  * marking the end of the chained SGL.
4121                  * Possibly over-allocate task sgl size by using cmd sgl size.
4122                  * It's so much easier and only a waste when task_count > 1.
4123                  * That is extremely rare.
4124                  */
4125                 task->task_sg_nents = sgl_nents;
4126                 if (cmd->se_tfo->task_sg_chaining) {
4127                         task->task_sg_nents++;
4128                         task->task_padded_sg = 1;
4129                 }
4130
4131                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
4132                                         task->task_sg_nents, GFP_KERNEL);
4133                 if (!task->task_sg) {
4134                         cmd->se_dev->transport->free_task(task);
4135                         return -ENOMEM;
4136                 }
4137
4138                 sg_init_table(task->task_sg, task->task_sg_nents);
4139
4140                 task_size = task->task_size;
4141
4142                 /* Build new sgl, only up to task_size */
4143                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
4144                         if (cmd_sg->length > task_size)
4145                                 break;
4146
4147                         *sg = *cmd_sg;
4148                         task_size -= cmd_sg->length;
4149                         cmd_sg = sg_next(cmd_sg);
4150                 }
4151
4152                 lba += task->task_sectors;
4153                 sectors -= task->task_sectors;
4154
4155                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4156                 list_add_tail(&task->t_list, &cmd->t_task_list);
4157                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4158         }
4159         /*
4160          * Now perform the memory map of task->task_sg[] into backend
4161          * subsystem memory..
4162          */
4163         list_for_each_entry(task, &cmd->t_task_list, t_list) {
4164                 if (atomic_read(&task->task_sent))
4165                         continue;
4166                 if (!dev->transport->map_data_SG)
4167                         continue;
4168
4169                 ret = dev->transport->map_data_SG(task);
4170                 if (ret < 0)
4171                         return 0;
4172         }
4173
4174         return task_count;
4175 }
4176
4177 static int
4178 transport_allocate_control_task(struct se_cmd *cmd)
4179 {
4180         struct se_device *dev = cmd->se_dev;
4181         unsigned char *cdb;
4182         struct se_task *task;
4183         unsigned long flags;
4184         int ret = 0;
4185
4186         task = transport_generic_get_task(cmd, cmd->data_direction);
4187         if (!task)
4188                 return -ENOMEM;
4189
4190         cdb = dev->transport->get_cdb(task);
4191         BUG_ON(!cdb);
4192         memcpy(cdb, cmd->t_task_cdb,
4193                scsi_command_size(cmd->t_task_cdb));
4194
4195         task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
4196                                 GFP_KERNEL);
4197         if (!task->task_sg) {
4198                 cmd->se_dev->transport->free_task(task);
4199                 return -ENOMEM;
4200         }
4201
4202         memcpy(task->task_sg, cmd->t_data_sg,
4203                sizeof(struct scatterlist) * cmd->t_data_nents);
4204         task->task_size = cmd->data_length;
4205         task->task_sg_nents = cmd->t_data_nents;
4206
4207         spin_lock_irqsave(&cmd->t_state_lock, flags);
4208         list_add_tail(&task->t_list, &cmd->t_task_list);
4209         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4210
4211         if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) {
4212                 if (dev->transport->map_control_SG)
4213                         ret = dev->transport->map_control_SG(task);
4214         } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) {
4215                 if (dev->transport->cdb_none)
4216                         ret = dev->transport->cdb_none(task);
4217         } else {
4218                 pr_err("target: Unknown control cmd type!\n");
4219                 BUG();
4220         }
4221
4222         /* Success! Return number of tasks allocated */
4223         if (ret == 0)
4224                 return 1;
4225         return ret;
4226 }
4227
4228 static u32 transport_allocate_tasks(
4229         struct se_cmd *cmd,
4230         unsigned long long lba,
4231         enum dma_data_direction data_direction,
4232         struct scatterlist *sgl,
4233         unsigned int sgl_nents)
4234 {
4235         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)
4236                 return transport_allocate_data_tasks(cmd, lba, data_direction,
4237                                                      sgl, sgl_nents);
4238         else
4239                 return transport_allocate_control_task(cmd);
4240
4241 }
4242
4243
4244 /*       transport_generic_new_cmd(): Called from transport_processing_thread()
4245  *
4246  *       Allocate storage transport resources from a set of values predefined
4247  *       by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4248  *       Any non zero return here is treated as an "out of resource' op here.
4249  */
4250         /*
4251          * Generate struct se_task(s) and/or their payloads for this CDB.
4252          */
4253 int transport_generic_new_cmd(struct se_cmd *cmd)
4254 {
4255         int ret = 0;
4256
4257         /*
4258          * Determine is the TCM fabric module has already allocated physical
4259          * memory, and is directly calling transport_generic_map_mem_to_cmd()
4260          * beforehand.
4261          */
4262         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4263             cmd->data_length) {
4264                 ret = transport_generic_get_mem(cmd);
4265                 if (ret < 0)
4266                         return ret;
4267         }
4268         /*
4269          * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4270          * control or data CDB types, and perform the map to backend subsystem
4271          * code from SGL memory allocated here by transport_generic_get_mem(), or
4272          * via pre-existing SGL memory setup explictly by fabric module code with
4273          * transport_generic_map_mem_to_cmd().
4274          */
4275         ret = transport_new_cmd_obj(cmd);
4276         if (ret < 0)
4277                 return ret;
4278         /*
4279          * For WRITEs, let the fabric know its buffer is ready..
4280          * This WRITE struct se_cmd (and all of its associated struct se_task's)
4281          * will be added to the struct se_device execution queue after its WRITE
4282          * data has arrived. (ie: It gets handled by the transport processing
4283          * thread a second time)
4284          */
4285         if (cmd->data_direction == DMA_TO_DEVICE) {
4286                 transport_add_tasks_to_state_queue(cmd);
4287                 return transport_generic_write_pending(cmd);
4288         }
4289         /*
4290          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4291          * to the execution queue.
4292          */
4293         transport_execute_tasks(cmd);
4294         return 0;
4295 }
4296 EXPORT_SYMBOL(transport_generic_new_cmd);
4297
4298 /*      transport_generic_process_write():
4299  *
4300  *
4301  */
4302 void transport_generic_process_write(struct se_cmd *cmd)
4303 {
4304         transport_execute_tasks(cmd);
4305 }
4306 EXPORT_SYMBOL(transport_generic_process_write);
4307
4308 static int transport_write_pending_qf(struct se_cmd *cmd)
4309 {
4310         return cmd->se_tfo->write_pending(cmd);
4311 }
4312
4313 /*      transport_generic_write_pending():
4314  *
4315  *
4316  */
4317 static int transport_generic_write_pending(struct se_cmd *cmd)
4318 {
4319         unsigned long flags;
4320         int ret;
4321
4322         spin_lock_irqsave(&cmd->t_state_lock, flags);
4323         cmd->t_state = TRANSPORT_WRITE_PENDING;
4324         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4325
4326         if (cmd->transport_qf_callback) {
4327                 ret = cmd->transport_qf_callback(cmd);
4328                 if (ret == -EAGAIN)
4329                         goto queue_full;
4330                 else if (ret < 0)
4331                         return ret;
4332
4333                 cmd->transport_qf_callback = NULL;
4334                 return 0;
4335         }
4336
4337         /*
4338          * Clear the se_cmd for WRITE_PENDING status in order to set
4339          * cmd->t_transport_active=0 so that transport_generic_handle_data
4340          * can be called from HW target mode interrupt code.  This is safe
4341          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4342          * because the se_cmd->se_lun pointer is not being cleared.
4343          */
4344         transport_cmd_check_stop(cmd, 1, 0);
4345
4346         /*
4347          * Call the fabric write_pending function here to let the
4348          * frontend know that WRITE buffers are ready.
4349          */
4350         ret = cmd->se_tfo->write_pending(cmd);
4351         if (ret == -EAGAIN)
4352                 goto queue_full;
4353         else if (ret < 0)
4354                 return ret;
4355
4356         return PYX_TRANSPORT_WRITE_PENDING;
4357
4358 queue_full:
4359         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4360         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4361         transport_handle_queue_full(cmd, cmd->se_dev,
4362                         transport_write_pending_qf);
4363         return ret;
4364 }
4365
4366 void transport_release_cmd(struct se_cmd *cmd)
4367 {
4368         BUG_ON(!cmd->se_tfo);
4369
4370         transport_free_se_cmd(cmd);
4371         cmd->se_tfo->release_cmd(cmd);
4372 }
4373 EXPORT_SYMBOL(transport_release_cmd);
4374
4375 /*      transport_generic_free_cmd():
4376  *
4377  *      Called from processing frontend to release storage engine resources
4378  */
4379 void transport_generic_free_cmd(
4380         struct se_cmd *cmd,
4381         int wait_for_tasks,
4382         int session_reinstatement)
4383 {
4384         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD))
4385                 transport_release_cmd(cmd);
4386         else {
4387                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4388
4389                 if (cmd->se_lun) {
4390 #if 0
4391                         pr_debug("cmd: %p ITT: 0x%08x contains"
4392                                 " cmd->se_lun\n", cmd,
4393                                 cmd->se_tfo->get_task_tag(cmd));
4394 #endif
4395                         transport_lun_remove_cmd(cmd);
4396                 }
4397
4398                 if (wait_for_tasks && cmd->transport_wait_for_tasks)
4399                         cmd->transport_wait_for_tasks(cmd, 0, 0);
4400
4401                 transport_free_dev_tasks(cmd);
4402
4403                 transport_generic_remove(cmd, session_reinstatement);
4404         }
4405 }
4406 EXPORT_SYMBOL(transport_generic_free_cmd);
4407
4408 static void transport_nop_wait_for_tasks(
4409         struct se_cmd *cmd,
4410         int remove_cmd,
4411         int session_reinstatement)
4412 {
4413         return;
4414 }
4415
4416 /*      transport_lun_wait_for_tasks():
4417  *
4418  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4419  *      an struct se_lun to be successfully shutdown.
4420  */
4421 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4422 {
4423         unsigned long flags;
4424         int ret;
4425         /*
4426          * If the frontend has already requested this struct se_cmd to
4427          * be stopped, we can safely ignore this struct se_cmd.
4428          */
4429         spin_lock_irqsave(&cmd->t_state_lock, flags);
4430         if (atomic_read(&cmd->t_transport_stop)) {
4431                 atomic_set(&cmd->transport_lun_stop, 0);
4432                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4433                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4434                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4435                 transport_cmd_check_stop(cmd, 1, 0);
4436                 return -EPERM;
4437         }
4438         atomic_set(&cmd->transport_lun_fe_stop, 1);
4439         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4440
4441         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4442
4443         ret = transport_stop_tasks_for_cmd(cmd);
4444
4445         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4446                         " %d\n", cmd, cmd->t_task_list_num, ret);
4447         if (!ret) {
4448                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4449                                 cmd->se_tfo->get_task_tag(cmd));
4450                 wait_for_completion(&cmd->transport_lun_stop_comp);
4451                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4452                                 cmd->se_tfo->get_task_tag(cmd));
4453         }
4454         transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
4455
4456         return 0;
4457 }
4458
4459 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4460 {
4461         struct se_cmd *cmd = NULL;
4462         unsigned long lun_flags, cmd_flags;
4463         /*
4464          * Do exception processing and return CHECK_CONDITION status to the
4465          * Initiator Port.
4466          */
4467         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4468         while (!list_empty(&lun->lun_cmd_list)) {
4469                 cmd = list_first_entry(&lun->lun_cmd_list,
4470                        struct se_cmd, se_lun_node);
4471                 list_del(&cmd->se_lun_node);
4472
4473                 atomic_set(&cmd->transport_lun_active, 0);
4474                 /*
4475                  * This will notify iscsi_target_transport.c:
4476                  * transport_cmd_check_stop() that a LUN shutdown is in
4477                  * progress for the iscsi_cmd_t.
4478                  */
4479                 spin_lock(&cmd->t_state_lock);
4480                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4481                         "_lun_stop for  ITT: 0x%08x\n",
4482                         cmd->se_lun->unpacked_lun,
4483                         cmd->se_tfo->get_task_tag(cmd));
4484                 atomic_set(&cmd->transport_lun_stop, 1);
4485                 spin_unlock(&cmd->t_state_lock);
4486
4487                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4488
4489                 if (!cmd->se_lun) {
4490                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4491                                 cmd->se_tfo->get_task_tag(cmd),
4492                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4493                         BUG();
4494                 }
4495                 /*
4496                  * If the Storage engine still owns the iscsi_cmd_t, determine
4497                  * and/or stop its context.
4498                  */
4499                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4500                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4501                         cmd->se_tfo->get_task_tag(cmd));
4502
4503                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4504                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4505                         continue;
4506                 }
4507
4508                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4509                         "_wait_for_tasks(): SUCCESS\n",
4510                         cmd->se_lun->unpacked_lun,
4511                         cmd->se_tfo->get_task_tag(cmd));
4512
4513                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4514                 if (!atomic_read(&cmd->transport_dev_active)) {
4515                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4516                         goto check_cond;
4517                 }
4518                 atomic_set(&cmd->transport_dev_active, 0);
4519                 transport_all_task_dev_remove_state(cmd);
4520                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4521
4522                 transport_free_dev_tasks(cmd);
4523                 /*
4524                  * The Storage engine stopped this struct se_cmd before it was
4525                  * send to the fabric frontend for delivery back to the
4526                  * Initiator Node.  Return this SCSI CDB back with an
4527                  * CHECK_CONDITION status.
4528                  */
4529 check_cond:
4530                 transport_send_check_condition_and_sense(cmd,
4531                                 TCM_NON_EXISTENT_LUN, 0);
4532                 /*
4533                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4534                  * be released, notify the waiting thread now that LU has
4535                  * finished accessing it.
4536                  */
4537                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4538                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4539                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4540                                 " struct se_cmd: %p ITT: 0x%08x\n",
4541                                 lun->unpacked_lun,
4542                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4543
4544                         spin_unlock_irqrestore(&cmd->t_state_lock,
4545                                         cmd_flags);
4546                         transport_cmd_check_stop(cmd, 1, 0);
4547                         complete(&cmd->transport_lun_fe_stop_comp);
4548                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4549                         continue;
4550                 }
4551                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4552                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4553
4554                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4555                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4556         }
4557         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4558 }
4559
4560 static int transport_clear_lun_thread(void *p)
4561 {
4562         struct se_lun *lun = (struct se_lun *)p;
4563
4564         __transport_clear_lun_from_sessions(lun);
4565         complete(&lun->lun_shutdown_comp);
4566
4567         return 0;
4568 }
4569
4570 int transport_clear_lun_from_sessions(struct se_lun *lun)
4571 {
4572         struct task_struct *kt;
4573
4574         kt = kthread_run(transport_clear_lun_thread, lun,
4575                         "tcm_cl_%u", lun->unpacked_lun);
4576         if (IS_ERR(kt)) {
4577                 pr_err("Unable to start clear_lun thread\n");
4578                 return PTR_ERR(kt);
4579         }
4580         wait_for_completion(&lun->lun_shutdown_comp);
4581
4582         return 0;
4583 }
4584
4585 /*      transport_generic_wait_for_tasks():
4586  *
4587  *      Called from frontend or passthrough context to wait for storage engine
4588  *      to pause and/or release frontend generated struct se_cmd.
4589  */
4590 static void transport_generic_wait_for_tasks(
4591         struct se_cmd *cmd,
4592         int remove_cmd,
4593         int session_reinstatement)
4594 {
4595         unsigned long flags;
4596
4597         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req))
4598                 return;
4599
4600         spin_lock_irqsave(&cmd->t_state_lock, flags);
4601         /*
4602          * If we are already stopped due to an external event (ie: LUN shutdown)
4603          * sleep until the connection can have the passed struct se_cmd back.
4604          * The cmd->transport_lun_stopped_sem will be upped by
4605          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4606          * has completed its operation on the struct se_cmd.
4607          */
4608         if (atomic_read(&cmd->transport_lun_stop)) {
4609
4610                 pr_debug("wait_for_tasks: Stopping"
4611                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4612                         "_stop_comp); for ITT: 0x%08x\n",
4613                         cmd->se_tfo->get_task_tag(cmd));
4614                 /*
4615                  * There is a special case for WRITES where a FE exception +
4616                  * LUN shutdown means ConfigFS context is still sleeping on
4617                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4618                  * We go ahead and up transport_lun_stop_comp just to be sure
4619                  * here.
4620                  */
4621                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4622                 complete(&cmd->transport_lun_stop_comp);
4623                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4624                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4625
4626                 transport_all_task_dev_remove_state(cmd);
4627                 /*
4628                  * At this point, the frontend who was the originator of this
4629                  * struct se_cmd, now owns the structure and can be released through
4630                  * normal means below.
4631                  */
4632                 pr_debug("wait_for_tasks: Stopped"
4633                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4634                         "stop_comp); for ITT: 0x%08x\n",
4635                         cmd->se_tfo->get_task_tag(cmd));
4636
4637                 atomic_set(&cmd->transport_lun_stop, 0);
4638         }
4639         if (!atomic_read(&cmd->t_transport_active) ||
4640              atomic_read(&cmd->t_transport_aborted))
4641                 goto remove;
4642
4643         atomic_set(&cmd->t_transport_stop, 1);
4644
4645         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4646                 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4647                 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4648                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4649                 cmd->deferred_t_state);
4650
4651         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4652
4653         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4654
4655         wait_for_completion(&cmd->t_transport_stop_comp);
4656
4657         spin_lock_irqsave(&cmd->t_state_lock, flags);
4658         atomic_set(&cmd->t_transport_active, 0);
4659         atomic_set(&cmd->t_transport_stop, 0);
4660
4661         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4662                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4663                 cmd->se_tfo->get_task_tag(cmd));
4664 remove:
4665         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4666         if (!remove_cmd)
4667                 return;
4668
4669         transport_generic_free_cmd(cmd, 0, session_reinstatement);
4670 }
4671
4672 static int transport_get_sense_codes(
4673         struct se_cmd *cmd,
4674         u8 *asc,
4675         u8 *ascq)
4676 {
4677         *asc = cmd->scsi_asc;
4678         *ascq = cmd->scsi_ascq;
4679
4680         return 0;
4681 }
4682
4683 static int transport_set_sense_codes(
4684         struct se_cmd *cmd,
4685         u8 asc,
4686         u8 ascq)
4687 {
4688         cmd->scsi_asc = asc;
4689         cmd->scsi_ascq = ascq;
4690
4691         return 0;
4692 }
4693
4694 int transport_send_check_condition_and_sense(
4695         struct se_cmd *cmd,
4696         u8 reason,
4697         int from_transport)
4698 {
4699         unsigned char *buffer = cmd->sense_buffer;
4700         unsigned long flags;
4701         int offset;
4702         u8 asc = 0, ascq = 0;
4703
4704         spin_lock_irqsave(&cmd->t_state_lock, flags);
4705         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4706                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4707                 return 0;
4708         }
4709         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4710         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4711
4712         if (!reason && from_transport)
4713                 goto after_reason;
4714
4715         if (!from_transport)
4716                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4717         /*
4718          * Data Segment and SenseLength of the fabric response PDU.
4719          *
4720          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4721          * from include/scsi/scsi_cmnd.h
4722          */
4723         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4724                                 TRANSPORT_SENSE_BUFFER);
4725         /*
4726          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4727          * SENSE KEY values from include/scsi/scsi.h
4728          */
4729         switch (reason) {
4730         case TCM_NON_EXISTENT_LUN:
4731         case TCM_UNSUPPORTED_SCSI_OPCODE:
4732         case TCM_SECTOR_COUNT_TOO_MANY:
4733                 /* CURRENT ERROR */
4734                 buffer[offset] = 0x70;
4735                 /* ILLEGAL REQUEST */
4736                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4737                 /* INVALID COMMAND OPERATION CODE */
4738                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4739                 break;
4740         case TCM_UNKNOWN_MODE_PAGE:
4741                 /* CURRENT ERROR */
4742                 buffer[offset] = 0x70;
4743                 /* ILLEGAL REQUEST */
4744                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4745                 /* INVALID FIELD IN CDB */
4746                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4747                 break;
4748         case TCM_CHECK_CONDITION_ABORT_CMD:
4749                 /* CURRENT ERROR */
4750                 buffer[offset] = 0x70;
4751                 /* ABORTED COMMAND */
4752                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4753                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4754                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4755                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4756                 break;
4757         case TCM_INCORRECT_AMOUNT_OF_DATA:
4758                 /* CURRENT ERROR */
4759                 buffer[offset] = 0x70;
4760                 /* ABORTED COMMAND */
4761                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4762                 /* WRITE ERROR */
4763                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4764                 /* NOT ENOUGH UNSOLICITED DATA */
4765                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4766                 break;
4767         case TCM_INVALID_CDB_FIELD:
4768                 /* CURRENT ERROR */
4769                 buffer[offset] = 0x70;
4770                 /* ABORTED COMMAND */
4771                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4772                 /* INVALID FIELD IN CDB */
4773                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4774                 break;
4775         case TCM_INVALID_PARAMETER_LIST:
4776                 /* CURRENT ERROR */
4777                 buffer[offset] = 0x70;
4778                 /* ABORTED COMMAND */
4779                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4780                 /* INVALID FIELD IN PARAMETER LIST */
4781                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4782                 break;
4783         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4784                 /* CURRENT ERROR */
4785                 buffer[offset] = 0x70;
4786                 /* ABORTED COMMAND */
4787                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4788                 /* WRITE ERROR */
4789                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4790                 /* UNEXPECTED_UNSOLICITED_DATA */
4791                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4792                 break;
4793         case TCM_SERVICE_CRC_ERROR:
4794                 /* CURRENT ERROR */
4795                 buffer[offset] = 0x70;
4796                 /* ABORTED COMMAND */
4797                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4798                 /* PROTOCOL SERVICE CRC ERROR */
4799                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4800                 /* N/A */
4801                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4802                 break;
4803         case TCM_SNACK_REJECTED:
4804                 /* CURRENT ERROR */
4805                 buffer[offset] = 0x70;
4806                 /* ABORTED COMMAND */
4807                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4808                 /* READ ERROR */
4809                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4810                 /* FAILED RETRANSMISSION REQUEST */
4811                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4812                 break;
4813         case TCM_WRITE_PROTECTED:
4814                 /* CURRENT ERROR */
4815                 buffer[offset] = 0x70;
4816                 /* DATA PROTECT */
4817                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4818                 /* WRITE PROTECTED */
4819                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4820                 break;
4821         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4822                 /* CURRENT ERROR */
4823                 buffer[offset] = 0x70;
4824                 /* UNIT ATTENTION */
4825                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4826                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4827                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4828                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4829                 break;
4830         case TCM_CHECK_CONDITION_NOT_READY:
4831                 /* CURRENT ERROR */
4832                 buffer[offset] = 0x70;
4833                 /* Not Ready */
4834                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4835                 transport_get_sense_codes(cmd, &asc, &ascq);
4836                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4837                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4838                 break;
4839         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4840         default:
4841                 /* CURRENT ERROR */
4842                 buffer[offset] = 0x70;
4843                 /* ILLEGAL REQUEST */
4844                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4845                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4846                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4847                 break;
4848         }
4849         /*
4850          * This code uses linux/include/scsi/scsi.h SAM status codes!
4851          */
4852         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4853         /*
4854          * Automatically padded, this value is encoded in the fabric's
4855          * data_length response PDU containing the SCSI defined sense data.
4856          */
4857         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4858
4859 after_reason:
4860         return cmd->se_tfo->queue_status(cmd);
4861 }
4862 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4863
4864 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4865 {
4866         int ret = 0;
4867
4868         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4869                 if (!send_status ||
4870                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4871                         return 1;
4872 #if 0
4873                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4874                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4875                         cmd->t_task_cdb[0],
4876                         cmd->se_tfo->get_task_tag(cmd));
4877 #endif
4878                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4879                 cmd->se_tfo->queue_status(cmd);
4880                 ret = 1;
4881         }
4882         return ret;
4883 }
4884 EXPORT_SYMBOL(transport_check_aborted_status);
4885
4886 void transport_send_task_abort(struct se_cmd *cmd)
4887 {
4888         /*
4889          * If there are still expected incoming fabric WRITEs, we wait
4890          * until until they have completed before sending a TASK_ABORTED
4891          * response.  This response with TASK_ABORTED status will be
4892          * queued back to fabric module by transport_check_aborted_status().
4893          */
4894         if (cmd->data_direction == DMA_TO_DEVICE) {
4895                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4896                         atomic_inc(&cmd->t_transport_aborted);
4897                         smp_mb__after_atomic_inc();
4898                         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4899                         transport_new_cmd_failure(cmd);
4900                         return;
4901                 }
4902         }
4903         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4904 #if 0
4905         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4906                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4907                 cmd->se_tfo->get_task_tag(cmd));
4908 #endif
4909         cmd->se_tfo->queue_status(cmd);
4910 }
4911
4912 /*      transport_generic_do_tmr():
4913  *
4914  *
4915  */
4916 int transport_generic_do_tmr(struct se_cmd *cmd)
4917 {
4918         struct se_device *dev = cmd->se_dev;
4919         struct se_tmr_req *tmr = cmd->se_tmr_req;
4920         int ret;
4921
4922         switch (tmr->function) {
4923         case TMR_ABORT_TASK:
4924                 tmr->response = TMR_FUNCTION_REJECTED;
4925                 break;
4926         case TMR_ABORT_TASK_SET:
4927         case TMR_CLEAR_ACA:
4928         case TMR_CLEAR_TASK_SET:
4929                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4930                 break;
4931         case TMR_LUN_RESET:
4932                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4933                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4934                                          TMR_FUNCTION_REJECTED;
4935                 break;
4936         case TMR_TARGET_WARM_RESET:
4937                 tmr->response = TMR_FUNCTION_REJECTED;
4938                 break;
4939         case TMR_TARGET_COLD_RESET:
4940                 tmr->response = TMR_FUNCTION_REJECTED;
4941                 break;
4942         default:
4943                 pr_err("Uknown TMR function: 0x%02x.\n",
4944                                 tmr->function);
4945                 tmr->response = TMR_FUNCTION_REJECTED;
4946                 break;
4947         }
4948
4949         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4950         cmd->se_tfo->queue_tm_rsp(cmd);
4951
4952         transport_cmd_check_stop(cmd, 2, 0);
4953         return 0;
4954 }
4955
4956 /*
4957  *      Called with spin_lock_irq(&dev->execute_task_lock); held
4958  *
4959  */
4960 static struct se_task *
4961 transport_get_task_from_state_list(struct se_device *dev)
4962 {
4963         struct se_task *task;
4964
4965         if (list_empty(&dev->state_task_list))
4966                 return NULL;
4967
4968         list_for_each_entry(task, &dev->state_task_list, t_state_list)
4969                 break;
4970
4971         list_del(&task->t_state_list);
4972         atomic_set(&task->task_state_active, 0);
4973
4974         return task;
4975 }
4976
4977 static void transport_processing_shutdown(struct se_device *dev)
4978 {
4979         struct se_cmd *cmd;
4980         struct se_task *task;
4981         unsigned long flags;
4982         /*
4983          * Empty the struct se_device's struct se_task state list.
4984          */
4985         spin_lock_irqsave(&dev->execute_task_lock, flags);
4986         while ((task = transport_get_task_from_state_list(dev))) {
4987                 if (!task->task_se_cmd) {
4988                         pr_err("task->task_se_cmd is NULL!\n");
4989                         continue;
4990                 }
4991                 cmd = task->task_se_cmd;
4992
4993                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
4994
4995                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4996
4997                 pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
4998                         " i_state: %d, t_state/def_t_state:"
4999                         " %d/%d cdb: 0x%02x\n", cmd, task,
5000                         cmd->se_tfo->get_task_tag(cmd),
5001                         cmd->se_tfo->get_cmd_state(cmd),
5002                         cmd->t_state, cmd->deferred_t_state,
5003                         cmd->t_task_cdb[0]);
5004                 pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
5005                         " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
5006                         " t_transport_stop: %d t_transport_sent: %d\n",
5007                         cmd->se_tfo->get_task_tag(cmd),
5008                         cmd->t_task_list_num,
5009                         atomic_read(&cmd->t_task_cdbs_left),
5010                         atomic_read(&cmd->t_task_cdbs_sent),
5011                         atomic_read(&cmd->t_transport_active),
5012                         atomic_read(&cmd->t_transport_stop),
5013                         atomic_read(&cmd->t_transport_sent));
5014
5015                 if (atomic_read(&task->task_active)) {
5016                         atomic_set(&task->task_stop, 1);
5017                         spin_unlock_irqrestore(
5018                                 &cmd->t_state_lock, flags);
5019
5020                         pr_debug("Waiting for task: %p to shutdown for dev:"
5021                                 " %p\n", task, dev);
5022                         wait_for_completion(&task->task_stop_comp);
5023                         pr_debug("Completed task: %p shutdown for dev: %p\n",
5024                                 task, dev);
5025
5026                         spin_lock_irqsave(&cmd->t_state_lock, flags);
5027                         atomic_dec(&cmd->t_task_cdbs_left);
5028
5029                         atomic_set(&task->task_active, 0);
5030                         atomic_set(&task->task_stop, 0);
5031                 } else {
5032                         if (atomic_read(&task->task_execute_queue) != 0)
5033                                 transport_remove_task_from_execute_queue(task, dev);
5034                 }
5035                 __transport_stop_task_timer(task, &flags);
5036
5037                 if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
5038                         spin_unlock_irqrestore(
5039                                         &cmd->t_state_lock, flags);
5040
5041                         pr_debug("Skipping task: %p, dev: %p for"
5042                                 " t_task_cdbs_ex_left: %d\n", task, dev,
5043                                 atomic_read(&cmd->t_task_cdbs_ex_left));
5044
5045                         spin_lock_irqsave(&dev->execute_task_lock, flags);
5046                         continue;
5047                 }
5048
5049                 if (atomic_read(&cmd->t_transport_active)) {
5050                         pr_debug("got t_transport_active = 1 for task: %p, dev:"
5051                                         " %p\n", task, dev);
5052
5053                         if (atomic_read(&cmd->t_fe_count)) {
5054                                 spin_unlock_irqrestore(
5055                                         &cmd->t_state_lock, flags);
5056                                 transport_send_check_condition_and_sense(
5057                                         cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
5058                                         0);
5059                                 transport_remove_cmd_from_queue(cmd,
5060                                         &cmd->se_dev->dev_queue_obj);
5061
5062                                 transport_lun_remove_cmd(cmd);
5063                                 transport_cmd_check_stop(cmd, 1, 0);
5064                         } else {
5065                                 spin_unlock_irqrestore(
5066                                         &cmd->t_state_lock, flags);
5067
5068                                 transport_remove_cmd_from_queue(cmd,
5069                                         &cmd->se_dev->dev_queue_obj);
5070
5071                                 transport_lun_remove_cmd(cmd);
5072
5073                                 if (transport_cmd_check_stop(cmd, 1, 0))
5074                                         transport_generic_remove(cmd, 0);
5075                         }
5076
5077                         spin_lock_irqsave(&dev->execute_task_lock, flags);
5078                         continue;
5079                 }
5080                 pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
5081                                 task, dev);
5082
5083                 if (atomic_read(&cmd->t_fe_count)) {
5084                         spin_unlock_irqrestore(
5085                                 &cmd->t_state_lock, flags);
5086                         transport_send_check_condition_and_sense(cmd,
5087                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5088                         transport_remove_cmd_from_queue(cmd,
5089                                 &cmd->se_dev->dev_queue_obj);
5090
5091                         transport_lun_remove_cmd(cmd);
5092                         transport_cmd_check_stop(cmd, 1, 0);
5093                 } else {
5094                         spin_unlock_irqrestore(
5095                                 &cmd->t_state_lock, flags);
5096
5097                         transport_remove_cmd_from_queue(cmd,
5098                                 &cmd->se_dev->dev_queue_obj);
5099                         transport_lun_remove_cmd(cmd);
5100
5101                         if (transport_cmd_check_stop(cmd, 1, 0))
5102                                 transport_generic_remove(cmd, 0);
5103                 }
5104
5105                 spin_lock_irqsave(&dev->execute_task_lock, flags);
5106         }
5107         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
5108         /*
5109          * Empty the struct se_device's struct se_cmd list.
5110          */
5111         while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
5112
5113                 pr_debug("From Device Queue: cmd: %p t_state: %d\n",
5114                                 cmd, cmd->t_state);
5115
5116                 if (atomic_read(&cmd->t_fe_count)) {
5117                         transport_send_check_condition_and_sense(cmd,
5118                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
5119
5120                         transport_lun_remove_cmd(cmd);
5121                         transport_cmd_check_stop(cmd, 1, 0);
5122                 } else {
5123                         transport_lun_remove_cmd(cmd);
5124                         if (transport_cmd_check_stop(cmd, 1, 0))
5125                                 transport_generic_remove(cmd, 0);
5126                 }
5127         }
5128 }
5129
5130 /*      transport_processing_thread():
5131  *
5132  *
5133  */
5134 static int transport_processing_thread(void *param)
5135 {
5136         int ret;
5137         struct se_cmd *cmd;
5138         struct se_device *dev = (struct se_device *) param;
5139
5140         set_user_nice(current, -20);
5141
5142         while (!kthread_should_stop()) {
5143                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
5144                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
5145                                 kthread_should_stop());
5146                 if (ret < 0)
5147                         goto out;
5148
5149                 spin_lock_irq(&dev->dev_status_lock);
5150                 if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
5151                         spin_unlock_irq(&dev->dev_status_lock);
5152                         transport_processing_shutdown(dev);
5153                         continue;
5154                 }
5155                 spin_unlock_irq(&dev->dev_status_lock);
5156
5157 get_cmd:
5158                 __transport_execute_tasks(dev);
5159
5160                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
5161                 if (!cmd)
5162                         continue;
5163
5164                 switch (cmd->t_state) {
5165                 case TRANSPORT_NEW_CMD_MAP:
5166                         if (!cmd->se_tfo->new_cmd_map) {
5167                                 pr_err("cmd->se_tfo->new_cmd_map is"
5168                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
5169                                 BUG();
5170                         }
5171                         ret = cmd->se_tfo->new_cmd_map(cmd);
5172                         if (ret < 0) {
5173                                 cmd->transport_error_status = ret;
5174                                 transport_generic_request_failure(cmd, NULL,
5175                                                 0, (cmd->data_direction !=
5176                                                     DMA_TO_DEVICE));
5177                                 break;
5178                         }
5179                         /* Fall through */
5180                 case TRANSPORT_NEW_CMD:
5181                         ret = transport_generic_new_cmd(cmd);
5182                         if (ret == -EAGAIN)
5183                                 break;
5184                         else if (ret < 0) {
5185                                 cmd->transport_error_status = ret;
5186                                 transport_generic_request_failure(cmd, NULL,
5187                                         0, (cmd->data_direction !=
5188                                          DMA_TO_DEVICE));
5189                         }
5190                         break;
5191                 case TRANSPORT_PROCESS_WRITE:
5192                         transport_generic_process_write(cmd);
5193                         break;
5194                 case TRANSPORT_COMPLETE_OK:
5195                         transport_stop_all_task_timers(cmd);
5196                         transport_generic_complete_ok(cmd);
5197                         break;
5198                 case TRANSPORT_REMOVE:
5199                         transport_generic_remove(cmd, 0);
5200                         break;
5201                 case TRANSPORT_FREE_CMD_INTR:
5202                         transport_generic_free_cmd(cmd, 0, 0);
5203                         break;
5204                 case TRANSPORT_PROCESS_TMR:
5205                         transport_generic_do_tmr(cmd);
5206                         break;
5207                 case TRANSPORT_COMPLETE_FAILURE:
5208                         transport_generic_request_failure(cmd, NULL, 1, 1);
5209                         break;
5210                 case TRANSPORT_COMPLETE_TIMEOUT:
5211                         transport_stop_all_task_timers(cmd);
5212                         transport_generic_request_timeout(cmd);
5213                         break;
5214                 case TRANSPORT_COMPLETE_QF_WP:
5215                         transport_generic_write_pending(cmd);
5216                         break;
5217                 default:
5218                         pr_err("Unknown t_state: %d deferred_t_state:"
5219                                 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
5220                                 " %u\n", cmd->t_state, cmd->deferred_t_state,
5221                                 cmd->se_tfo->get_task_tag(cmd),
5222                                 cmd->se_tfo->get_cmd_state(cmd),
5223                                 cmd->se_lun->unpacked_lun);
5224                         BUG();
5225                 }
5226
5227                 goto get_cmd;
5228         }
5229
5230 out:
5231         transport_release_all_cmds(dev);
5232         dev->process_thread = NULL;
5233         return 0;
5234 }