drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <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_backend.h>
  49 #include <target/target_core_fabric.h>
  50 #include <target/target_core_configfs.h>
  51
  52 #include "target_core_internal.h"
  53 #include "target_core_alua.h"
  54 #include "target_core_pr.h"
  55 #include "target_core_ua.h"
  56
  57 static int sub_api_initialized;
  58
  59 static struct workqueue_struct *target_completion_wq;
  60 static struct kmem_cache *se_sess_cache;
  61 struct kmem_cache *se_tmr_req_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static int transport_generic_write_pending(struct se_cmd *);
  70 static int transport_processing_thread(void *param);
  71 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
  72 static void transport_complete_task_attr(struct se_cmd *cmd);
  73 static void transport_handle_queue_full(struct se_cmd *cmd,
  74                 struct se_device *dev);
  75 static void transport_free_dev_tasks(struct se_cmd *cmd);
  76 static int transport_generic_get_mem(struct se_cmd *cmd);
  77 static void transport_put_cmd(struct se_cmd *cmd);
  78 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  79 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  80 static void transport_generic_request_failure(struct se_cmd *);
  81 static void target_complete_ok_work(struct work_struct *work);
  82
  83 int init_se_kmem_caches(void)
  84 {
  85         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
  86                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
  87                         0, NULL);
  88         if (!se_tmr_req_cache) {
  89                 pr_err("kmem_cache_create() for struct se_tmr_req"
  90                                 " failed\n");
  91                 goto out;
  92         }
  93         se_sess_cache = kmem_cache_create("se_sess_cache",
  94                         sizeof(struct se_session), __alignof__(struct se_session),
  95                         0, NULL);
  96         if (!se_sess_cache) {
  97                 pr_err("kmem_cache_create() for struct se_session"
  98                                 " failed\n");
  99                 goto out_free_tmr_req_cache;
 100         }
 101         se_ua_cache = kmem_cache_create("se_ua_cache",
 102                         sizeof(struct se_ua), __alignof__(struct se_ua),
 103                         0, NULL);
 104         if (!se_ua_cache) {
 105                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 106                 goto out_free_sess_cache;
 107         }
 108         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 109                         sizeof(struct t10_pr_registration),
 110                         __alignof__(struct t10_pr_registration), 0, NULL);
 111         if (!t10_pr_reg_cache) {
 112                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 113                                 " failed\n");
 114                 goto out_free_ua_cache;
 115         }
 116         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 117                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 118                         0, NULL);
 119         if (!t10_alua_lu_gp_cache) {
 120                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 121                                 " failed\n");
 122                 goto out_free_pr_reg_cache;
 123         }
 124         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 125                         sizeof(struct t10_alua_lu_gp_member),
 126                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 127         if (!t10_alua_lu_gp_mem_cache) {
 128                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 129                                 "cache failed\n");
 130                 goto out_free_lu_gp_cache;
 131         }
 132         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 133                         sizeof(struct t10_alua_tg_pt_gp),
 134                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 135         if (!t10_alua_tg_pt_gp_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "cache failed\n");
 138                 goto out_free_lu_gp_mem_cache;
 139         }
 140         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 141                         "t10_alua_tg_pt_gp_mem_cache",
 142                         sizeof(struct t10_alua_tg_pt_gp_member),
 143                         __alignof__(struct t10_alua_tg_pt_gp_member),
 144                         0, NULL);
 145         if (!t10_alua_tg_pt_gp_mem_cache) {
 146                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 147                                 "mem_t failed\n");
 148                 goto out_free_tg_pt_gp_cache;
 149         }
 150
 151         target_completion_wq = alloc_workqueue("target_completion",
 152                                                WQ_MEM_RECLAIM, 0);
 153         if (!target_completion_wq)
 154                 goto out_free_tg_pt_gp_mem_cache;
 155
 156         return 0;
 157
 158 out_free_tg_pt_gp_mem_cache:
 159         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 160 out_free_tg_pt_gp_cache:
 161         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 162 out_free_lu_gp_mem_cache:
 163         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 164 out_free_lu_gp_cache:
 165         kmem_cache_destroy(t10_alua_lu_gp_cache);
 166 out_free_pr_reg_cache:
 167         kmem_cache_destroy(t10_pr_reg_cache);
 168 out_free_ua_cache:
 169         kmem_cache_destroy(se_ua_cache);
 170 out_free_sess_cache:
 171         kmem_cache_destroy(se_sess_cache);
 172 out_free_tmr_req_cache:
 173         kmem_cache_destroy(se_tmr_req_cache);
 174 out:
 175         return -ENOMEM;
 176 }
 177
 178 void release_se_kmem_caches(void)
 179 {
 180         destroy_workqueue(target_completion_wq);
 181         kmem_cache_destroy(se_tmr_req_cache);
 182         kmem_cache_destroy(se_sess_cache);
 183         kmem_cache_destroy(se_ua_cache);
 184         kmem_cache_destroy(t10_pr_reg_cache);
 185         kmem_cache_destroy(t10_alua_lu_gp_cache);
 186         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 187         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 188         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 189 }
 190
 191 /* This code ensures unique mib indexes are handed out. */
 192 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 193 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 194
 195 /*
 196  * Allocate a new row index for the entry type specified
 197  */
 198 u32 scsi_get_new_index(scsi_index_t type)
 199 {
 200         u32 new_index;
 201
 202         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 203
 204         spin_lock(&scsi_mib_index_lock);
 205         new_index = ++scsi_mib_index[type];
 206         spin_unlock(&scsi_mib_index_lock);
 207
 208         return new_index;
 209 }
 210
 211 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 212 {
 213         atomic_set(&qobj->queue_cnt, 0);
 214         INIT_LIST_HEAD(&qobj->qobj_list);
 215         init_waitqueue_head(&qobj->thread_wq);
 216         spin_lock_init(&qobj->cmd_queue_lock);
 217 }
 218
 219 void transport_subsystem_check_init(void)
 220 {
 221         int ret;
 222
 223         if (sub_api_initialized)
 224                 return;
 225
 226         ret = request_module("target_core_iblock");
 227         if (ret != 0)
 228                 pr_err("Unable to load target_core_iblock\n");
 229
 230         ret = request_module("target_core_file");
 231         if (ret != 0)
 232                 pr_err("Unable to load target_core_file\n");
 233
 234         ret = request_module("target_core_pscsi");
 235         if (ret != 0)
 236                 pr_err("Unable to load target_core_pscsi\n");
 237
 238         ret = request_module("target_core_stgt");
 239         if (ret != 0)
 240                 pr_err("Unable to load target_core_stgt\n");
 241
 242         sub_api_initialized = 1;
 243         return;
 244 }
 245
 246 struct se_session *transport_init_session(void)
 247 {
 248         struct se_session *se_sess;
 249
 250         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 251         if (!se_sess) {
 252                 pr_err("Unable to allocate struct se_session from"
 253                                 " se_sess_cache\n");
 254                 return ERR_PTR(-ENOMEM);
 255         }
 256         INIT_LIST_HEAD(&se_sess->sess_list);
 257         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 258         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 259         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 260         spin_lock_init(&se_sess->sess_cmd_lock);
 261
 262         return se_sess;
 263 }
 264 EXPORT_SYMBOL(transport_init_session);
 265
 266 /*
 267  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 268  */
 269 void __transport_register_session(
 270         struct se_portal_group *se_tpg,
 271         struct se_node_acl *se_nacl,
 272         struct se_session *se_sess,
 273         void *fabric_sess_ptr)
 274 {
 275         unsigned char buf[PR_REG_ISID_LEN];
 276
 277         se_sess->se_tpg = se_tpg;
 278         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 279         /*
 280          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 281          *
 282          * Only set for struct se_session's that will actually be moving I/O.
 283          * eg: *NOT* discovery sessions.
 284          */
 285         if (se_nacl) {
 286                 /*
 287                  * If the fabric module supports an ISID based TransportID,
 288                  * save this value in binary from the fabric I_T Nexus now.
 289                  */
 290                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 291                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 292                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 293                                         &buf[0], PR_REG_ISID_LEN);
 294                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 295                 }
 296                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 297                 /*
 298                  * The se_nacl->nacl_sess pointer will be set to the
 299                  * last active I_T Nexus for each struct se_node_acl.
 300                  */
 301                 se_nacl->nacl_sess = se_sess;
 302
 303                 list_add_tail(&se_sess->sess_acl_list,
 304                               &se_nacl->acl_sess_list);
 305                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 306         }
 307         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 308
 309         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 310                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 311 }
 312 EXPORT_SYMBOL(__transport_register_session);
 313
 314 void transport_register_session(
 315         struct se_portal_group *se_tpg,
 316         struct se_node_acl *se_nacl,
 317         struct se_session *se_sess,
 318         void *fabric_sess_ptr)
 319 {
 320         spin_lock_bh(&se_tpg->session_lock);
 321         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 322         spin_unlock_bh(&se_tpg->session_lock);
 323 }
 324 EXPORT_SYMBOL(transport_register_session);
 325
 326 void transport_deregister_session_configfs(struct se_session *se_sess)
 327 {
 328         struct se_node_acl *se_nacl;
 329         unsigned long flags;
 330         /*
 331          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 332          */
 333         se_nacl = se_sess->se_node_acl;
 334         if (se_nacl) {
 335                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 336                 list_del(&se_sess->sess_acl_list);
 337                 /*
 338                  * If the session list is empty, then clear the pointer.
 339                  * Otherwise, set the struct se_session pointer from the tail
 340                  * element of the per struct se_node_acl active session list.
 341                  */
 342                 if (list_empty(&se_nacl->acl_sess_list))
 343                         se_nacl->nacl_sess = NULL;
 344                 else {
 345                         se_nacl->nacl_sess = container_of(
 346                                         se_nacl->acl_sess_list.prev,
 347                                         struct se_session, sess_acl_list);
 348                 }
 349                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 350         }
 351 }
 352 EXPORT_SYMBOL(transport_deregister_session_configfs);
 353
 354 void transport_free_session(struct se_session *se_sess)
 355 {
 356         kmem_cache_free(se_sess_cache, se_sess);
 357 }
 358 EXPORT_SYMBOL(transport_free_session);
 359
 360 void transport_deregister_session(struct se_session *se_sess)
 361 {
 362         struct se_portal_group *se_tpg = se_sess->se_tpg;
 363         struct se_node_acl *se_nacl;
 364         unsigned long flags;
 365
 366         if (!se_tpg) {
 367                 transport_free_session(se_sess);
 368                 return;
 369         }
 370
 371         spin_lock_irqsave(&se_tpg->session_lock, flags);
 372         list_del(&se_sess->sess_list);
 373         se_sess->se_tpg = NULL;
 374         se_sess->fabric_sess_ptr = NULL;
 375         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 376
 377         /*
 378          * Determine if we need to do extra work for this initiator node's
 379          * struct se_node_acl if it had been previously dynamically generated.
 380          */
 381         se_nacl = se_sess->se_node_acl;
 382         if (se_nacl) {
 383                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 384                 if (se_nacl->dynamic_node_acl) {
 385                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 386                                         se_tpg)) {
 387                                 list_del(&se_nacl->acl_list);
 388                                 se_tpg->num_node_acls--;
 389                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 390
 391                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 392                                 core_free_device_list_for_node(se_nacl, se_tpg);
 393                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 394                                                 se_nacl);
 395                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 396                         }
 397                 }
 398                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 399         }
 400
 401         transport_free_session(se_sess);
 402
 403         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 404                 se_tpg->se_tpg_tfo->get_fabric_name());
 405 }
 406 EXPORT_SYMBOL(transport_deregister_session);
 407
 408 /*
 409  * Called with cmd->t_state_lock held.
 410  */
 411 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 412 {
 413         struct se_device *dev = cmd->se_dev;
 414         struct se_task *task;
 415         unsigned long flags;
 416
 417         if (!dev)
 418                 return;
 419
 420         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 421                 if (task->task_flags & TF_ACTIVE)
 422                         continue;
 423
 424                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 425                 if (task->t_state_active) {
 426                         pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 427                                 cmd->se_tfo->get_task_tag(cmd), dev, task);
 428
 429                         list_del(&task->t_state_list);
 430                         atomic_dec(&cmd->t_task_cdbs_ex_left);
 431                         task->t_state_active = false;
 432                 }
 433                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 434         }
 435
 436 }
 437
 438 /*      transport_cmd_check_stop():
 439  *
 440  *      'transport_off = 1' determines if t_transport_active should be cleared.
 441  *      'transport_off = 2' determines if task_dev_state should be removed.
 442  *
 443  *      A non-zero u8 t_state sets cmd->t_state.
 444  *      Returns 1 when command is stopped, else 0.
 445  */
 446 static int transport_cmd_check_stop(
 447         struct se_cmd *cmd,
 448         int transport_off,
 449         u8 t_state)
 450 {
 451         unsigned long flags;
 452
 453         spin_lock_irqsave(&cmd->t_state_lock, flags);
 454         /*
 455          * Determine if IOCTL context caller in requesting the stopping of this
 456          * command for LUN shutdown purposes.
 457          */
 458         if (atomic_read(&cmd->transport_lun_stop)) {
 459                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 460                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 461                         cmd->se_tfo->get_task_tag(cmd));
 462
 463                 atomic_set(&cmd->t_transport_active, 0);
 464                 if (transport_off == 2)
 465                         transport_all_task_dev_remove_state(cmd);
 466                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 467
 468                 complete(&cmd->transport_lun_stop_comp);
 469                 return 1;
 470         }
 471         /*
 472          * Determine if frontend context caller is requesting the stopping of
 473          * this command for frontend exceptions.
 474          */
 475         if (atomic_read(&cmd->t_transport_stop)) {
 476                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 477                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 478                         cmd->se_tfo->get_task_tag(cmd));
 479
 480                 if (transport_off == 2)
 481                         transport_all_task_dev_remove_state(cmd);
 482
 483                 /*
 484                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 485                  * to FE.
 486                  */
 487                 if (transport_off == 2)
 488                         cmd->se_lun = NULL;
 489                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 490
 491                 complete(&cmd->t_transport_stop_comp);
 492                 return 1;
 493         }
 494         if (transport_off) {
 495                 atomic_set(&cmd->t_transport_active, 0);
 496                 if (transport_off == 2) {
 497                         transport_all_task_dev_remove_state(cmd);
 498                         /*
 499                          * Clear struct se_cmd->se_lun before the transport_off == 2
 500                          * handoff to fabric module.
 501                          */
 502                         cmd->se_lun = NULL;
 503                         /*
 504                          * Some fabric modules like tcm_loop can release
 505                          * their internally allocated I/O reference now and
 506                          * struct se_cmd now.
 507                          *
 508                          * Fabric modules are expected to return '1' here if the
 509                          * se_cmd being passed is released at this point,
 510                          * or zero if not being released.
 511                          */
 512                         if (cmd->se_tfo->check_stop_free != NULL) {
 513                                 spin_unlock_irqrestore(
 514                                         &cmd->t_state_lock, flags);
 515
 516                                 return cmd->se_tfo->check_stop_free(cmd);
 517                         }
 518                 }
 519                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 520
 521                 return 0;
 522         } else if (t_state)
 523                 cmd->t_state = t_state;
 524         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 525
 526         return 0;
 527 }
 528
 529 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 530 {
 531         return transport_cmd_check_stop(cmd, 2, 0);
 532 }
 533
 534 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 535 {
 536         struct se_lun *lun = cmd->se_lun;
 537         unsigned long flags;
 538
 539         if (!lun)
 540                 return;
 541
 542         spin_lock_irqsave(&cmd->t_state_lock, flags);
 543         if (!atomic_read(&cmd->transport_dev_active)) {
 544                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 545                 goto check_lun;
 546         }
 547         atomic_set(&cmd->transport_dev_active, 0);
 548         transport_all_task_dev_remove_state(cmd);
 549         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 550
 551
 552 check_lun:
 553         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 554         if (atomic_read(&cmd->transport_lun_active)) {
 555                 list_del(&cmd->se_lun_node);
 556                 atomic_set(&cmd->transport_lun_active, 0);
 557 #if 0
 558                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 559                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 560 #endif
 561         }
 562         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 563 }
 564
 565 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 566 {
 567         if (!cmd->se_tmr_req)
 568                 transport_lun_remove_cmd(cmd);
 569
 570         if (transport_cmd_check_stop_to_fabric(cmd))
 571                 return;
 572         if (remove) {
 573                 transport_remove_cmd_from_queue(cmd);
 574                 transport_put_cmd(cmd);
 575         }
 576 }
 577
 578 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 579                 bool at_head)
 580 {
 581         struct se_device *dev = cmd->se_dev;
 582         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 583         unsigned long flags;
 584
 585         if (t_state) {
 586                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 587                 cmd->t_state = t_state;
 588                 atomic_set(&cmd->t_transport_active, 1);
 589                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 590         }
 591
 592         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 593
 594         /* If the cmd is already on the list, remove it before we add it */
 595         if (!list_empty(&cmd->se_queue_node))
 596                 list_del(&cmd->se_queue_node);
 597         else
 598                 atomic_inc(&qobj->queue_cnt);
 599
 600         if (at_head)
 601                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 602         else
 603                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 604         atomic_set(&cmd->t_transport_queue_active, 1);
 605         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 606
 607         wake_up_interruptible(&qobj->thread_wq);
 608 }
 609
 610 static struct se_cmd *
 611 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 612 {
 613         struct se_cmd *cmd;
 614         unsigned long flags;
 615
 616         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 617         if (list_empty(&qobj->qobj_list)) {
 618                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 619                 return NULL;
 620         }
 621         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 622
 623         atomic_set(&cmd->t_transport_queue_active, 0);
 624
 625         list_del_init(&cmd->se_queue_node);
 626         atomic_dec(&qobj->queue_cnt);
 627         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 628
 629         return cmd;
 630 }
 631
 632 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 633 {
 634         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 638         if (!atomic_read(&cmd->t_transport_queue_active)) {
 639                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 640                 return;
 641         }
 642         atomic_set(&cmd->t_transport_queue_active, 0);
 643         atomic_dec(&qobj->queue_cnt);
 644         list_del_init(&cmd->se_queue_node);
 645         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 646
 647         if (atomic_read(&cmd->t_transport_queue_active)) {
 648                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 649                         cmd->se_tfo->get_task_tag(cmd),
 650                         atomic_read(&cmd->t_transport_queue_active));
 651         }
 652 }
 653
 654 /*
 655  * Completion function used by TCM subsystem plugins (such as FILEIO)
 656  * for queueing up response from struct se_subsystem_api->do_task()
 657  */
 658 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 659 {
 660         struct se_task *task = list_entry(cmd->t_task_list.next,
 661                                 struct se_task, t_list);
 662
 663         if (good) {
 664                 cmd->scsi_status = SAM_STAT_GOOD;
 665                 task->task_scsi_status = GOOD;
 666         } else {
 667                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 668                 task->task_se_cmd->scsi_sense_reason =
 669                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 670
 671         }
 672
 673         transport_complete_task(task, good);
 674 }
 675 EXPORT_SYMBOL(transport_complete_sync_cache);
 676
 677 static void target_complete_failure_work(struct work_struct *work)
 678 {
 679         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 680
 681         transport_generic_request_failure(cmd);
 682 }
 683
 684 /*      transport_complete_task():
 685  *
 686  *      Called from interrupt and non interrupt context depending
 687  *      on the transport plugin.
 688  */
 689 void transport_complete_task(struct se_task *task, int success)
 690 {
 691         struct se_cmd *cmd = task->task_se_cmd;
 692         struct se_device *dev = cmd->se_dev;
 693         unsigned long flags;
 694
 695         spin_lock_irqsave(&cmd->t_state_lock, flags);
 696         task->task_flags &= ~TF_ACTIVE;
 697
 698         /*
 699          * See if any sense data exists, if so set the TASK_SENSE flag.
 700          * Also check for any other post completion work that needs to be
 701          * done by the plugins.
 702          */
 703         if (dev && dev->transport->transport_complete) {
 704                 if (dev->transport->transport_complete(task) != 0) {
 705                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 706                         task->task_flags |= TF_HAS_SENSE;
 707                         success = 1;
 708                 }
 709         }
 710
 711         /*
 712          * See if we are waiting for outstanding struct se_task
 713          * to complete for an exception condition
 714          */
 715         if (task->task_flags & TF_REQUEST_STOP) {
 716                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 717                 complete(&task->task_stop_comp);
 718                 return;
 719         }
 720
 721         if (!success)
 722                 cmd->t_tasks_failed = 1;
 723
 724         /*
 725          * Decrement the outstanding t_task_cdbs_left count.  The last
 726          * struct se_task from struct se_cmd will complete itself into the
 727          * device queue depending upon int success.
 728          */
 729         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 730                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 731                 return;
 732         }
 733
 734         if (cmd->t_tasks_failed) {
 735                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 736                 INIT_WORK(&cmd->work, target_complete_failure_work);
 737         } else {
 738                 atomic_set(&cmd->t_transport_complete, 1);
 739                 INIT_WORK(&cmd->work, target_complete_ok_work);
 740         }
 741
 742         cmd->t_state = TRANSPORT_COMPLETE;
 743         atomic_set(&cmd->t_transport_active, 1);
 744         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 745
 746         queue_work(target_completion_wq, &cmd->work);
 747 }
 748 EXPORT_SYMBOL(transport_complete_task);
 749
 750 /*
 751  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 752  * struct se_task list are ready to be added to the active execution list
 753  * struct se_device
 754
 755  * Called with se_dev_t->execute_task_lock called.
 756  */
 757 static inline int transport_add_task_check_sam_attr(
 758         struct se_task *task,
 759         struct se_task *task_prev,
 760         struct se_device *dev)
 761 {
 762         /*
 763          * No SAM Task attribute emulation enabled, add to tail of
 764          * execution queue
 765          */
 766         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 767                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 768                 return 0;
 769         }
 770         /*
 771          * HEAD_OF_QUEUE attribute for received CDB, which means
 772          * the first task that is associated with a struct se_cmd goes to
 773          * head of the struct se_device->execute_task_list, and task_prev
 774          * after that for each subsequent task
 775          */
 776         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 777                 list_add(&task->t_execute_list,
 778                                 (task_prev != NULL) ?
 779                                 &task_prev->t_execute_list :
 780                                 &dev->execute_task_list);
 781
 782                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 783                                 " in execution queue\n",
 784                                 task->task_se_cmd->t_task_cdb[0]);
 785                 return 1;
 786         }
 787         /*
 788          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 789          * transitioned from Dermant -> Active state, and are added to the end
 790          * of the struct se_device->execute_task_list
 791          */
 792         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 793         return 0;
 794 }
 795
 796 /*      __transport_add_task_to_execute_queue():
 797  *
 798  *      Called with se_dev_t->execute_task_lock called.
 799  */
 800 static void __transport_add_task_to_execute_queue(
 801         struct se_task *task,
 802         struct se_task *task_prev,
 803         struct se_device *dev)
 804 {
 805         int head_of_queue;
 806
 807         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 808         atomic_inc(&dev->execute_tasks);
 809
 810         if (task->t_state_active)
 811                 return;
 812         /*
 813          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 814          * state list as well.  Running with SAM Task Attribute emulation
 815          * will always return head_of_queue == 0 here
 816          */
 817         if (head_of_queue)
 818                 list_add(&task->t_state_list, (task_prev) ?
 819                                 &task_prev->t_state_list :
 820                                 &dev->state_task_list);
 821         else
 822                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 823
 824         task->t_state_active = true;
 825
 826         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 827                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 828                 task, dev);
 829 }
 830
 831 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 832 {
 833         struct se_device *dev = cmd->se_dev;
 834         struct se_task *task;
 835         unsigned long flags;
 836
 837         spin_lock_irqsave(&cmd->t_state_lock, flags);
 838         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 839                 spin_lock(&dev->execute_task_lock);
 840                 if (!task->t_state_active) {
 841                         list_add_tail(&task->t_state_list,
 842                                       &dev->state_task_list);
 843                         task->t_state_active = true;
 844
 845                         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 846                                 task->task_se_cmd->se_tfo->get_task_tag(
 847                                 task->task_se_cmd), task, dev);
 848                 }
 849                 spin_unlock(&dev->execute_task_lock);
 850         }
 851         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 852 }
 853
 854 static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
 855 {
 856         struct se_device *dev = cmd->se_dev;
 857         struct se_task *task, *task_prev = NULL;
 858
 859         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 860                 if (!list_empty(&task->t_execute_list))
 861                         continue;
 862                 /*
 863                  * __transport_add_task_to_execute_queue() handles the
 864                  * SAM Task Attribute emulation if enabled
 865                  */
 866                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 867                 task_prev = task;
 868         }
 869 }
 870
 871 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 872 {
 873         unsigned long flags;
 874         struct se_device *dev = cmd->se_dev;
 875
 876         spin_lock_irqsave(&dev->execute_task_lock, flags);
 877         __transport_add_tasks_from_cmd(cmd);
 878         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 879 }
 880
 881 void __transport_remove_task_from_execute_queue(struct se_task *task,
 882                 struct se_device *dev)
 883 {
 884         list_del_init(&task->t_execute_list);
 885         atomic_dec(&dev->execute_tasks);
 886 }
 887
 888 static void transport_remove_task_from_execute_queue(
 889         struct se_task *task,
 890         struct se_device *dev)
 891 {
 892         unsigned long flags;
 893
 894         if (WARN_ON(list_empty(&task->t_execute_list)))
 895                 return;
 896
 897         spin_lock_irqsave(&dev->execute_task_lock, flags);
 898         __transport_remove_task_from_execute_queue(task, dev);
 899         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 900 }
 901
 902 /*
 903  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 904  */
 905
 906 static void target_qf_do_work(struct work_struct *work)
 907 {
 908         struct se_device *dev = container_of(work, struct se_device,
 909                                         qf_work_queue);
 910         LIST_HEAD(qf_cmd_list);
 911         struct se_cmd *cmd, *cmd_tmp;
 912
 913         spin_lock_irq(&dev->qf_cmd_lock);
 914         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 915         spin_unlock_irq(&dev->qf_cmd_lock);
 916
 917         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 918                 list_del(&cmd->se_qf_node);
 919                 atomic_dec(&dev->dev_qf_count);
 920                 smp_mb__after_atomic_dec();
 921
 922                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 923                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 924                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 925                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 926                         : "UNKNOWN");
 927
 928                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 929         }
 930 }
 931
 932 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 933 {
 934         switch (cmd->data_direction) {
 935         case DMA_NONE:
 936                 return "NONE";
 937         case DMA_FROM_DEVICE:
 938                 return "READ";
 939         case DMA_TO_DEVICE:
 940                 return "WRITE";
 941         case DMA_BIDIRECTIONAL:
 942                 return "BIDI";
 943         default:
 944                 break;
 945         }
 946
 947         return "UNKNOWN";
 948 }
 949
 950 void transport_dump_dev_state(
 951         struct se_device *dev,
 952         char *b,
 953         int *bl)
 954 {
 955         *bl += sprintf(b + *bl, "Status: ");
 956         switch (dev->dev_status) {
 957         case TRANSPORT_DEVICE_ACTIVATED:
 958                 *bl += sprintf(b + *bl, "ACTIVATED");
 959                 break;
 960         case TRANSPORT_DEVICE_DEACTIVATED:
 961                 *bl += sprintf(b + *bl, "DEACTIVATED");
 962                 break;
 963         case TRANSPORT_DEVICE_SHUTDOWN:
 964                 *bl += sprintf(b + *bl, "SHUTDOWN");
 965                 break;
 966         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 967         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 968                 *bl += sprintf(b + *bl, "OFFLINE");
 969                 break;
 970         default:
 971                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 972                 break;
 973         }
 974
 975         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 976                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 977         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
 978                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 979         *bl += sprintf(b + *bl, "        ");
 980 }
 981
 982 void transport_dump_vpd_proto_id(
 983         struct t10_vpd *vpd,
 984         unsigned char *p_buf,
 985         int p_buf_len)
 986 {
 987         unsigned char buf[VPD_TMP_BUF_SIZE];
 988         int len;
 989
 990         memset(buf, 0, VPD_TMP_BUF_SIZE);
 991         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 992
 993         switch (vpd->protocol_identifier) {
 994         case 0x00:
 995                 sprintf(buf+len, "Fibre Channel\n");
 996                 break;
 997         case 0x10:
 998                 sprintf(buf+len, "Parallel SCSI\n");
 999                 break;
1000         case 0x20:
1001                 sprintf(buf+len, "SSA\n");
1002                 break;
1003         case 0x30:
1004                 sprintf(buf+len, "IEEE 1394\n");
1005                 break;
1006         case 0x40:
1007                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1008                                 " Protocol\n");
1009                 break;
1010         case 0x50:
1011                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1012                 break;
1013         case 0x60:
1014                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1015                 break;
1016         case 0x70:
1017                 sprintf(buf+len, "Automation/Drive Interface Transport"
1018                                 " Protocol\n");
1019                 break;
1020         case 0x80:
1021                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1022                 break;
1023         default:
1024                 sprintf(buf+len, "Unknown 0x%02x\n",
1025                                 vpd->protocol_identifier);
1026                 break;
1027         }
1028
1029         if (p_buf)
1030                 strncpy(p_buf, buf, p_buf_len);
1031         else
1032                 pr_debug("%s", buf);
1033 }
1034
1035 void
1036 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1037 {
1038         /*
1039          * Check if the Protocol Identifier Valid (PIV) bit is set..
1040          *
1041          * from spc3r23.pdf section 7.5.1
1042          */
1043          if (page_83[1] & 0x80) {
1044                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1045                 vpd->protocol_identifier_set = 1;
1046                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1047         }
1048 }
1049 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1050
1051 int transport_dump_vpd_assoc(
1052         struct t10_vpd *vpd,
1053         unsigned char *p_buf,
1054         int p_buf_len)
1055 {
1056         unsigned char buf[VPD_TMP_BUF_SIZE];
1057         int ret = 0;
1058         int len;
1059
1060         memset(buf, 0, VPD_TMP_BUF_SIZE);
1061         len = sprintf(buf, "T10 VPD Identifier Association: ");
1062
1063         switch (vpd->association) {
1064         case 0x00:
1065                 sprintf(buf+len, "addressed logical unit\n");
1066                 break;
1067         case 0x10:
1068                 sprintf(buf+len, "target port\n");
1069                 break;
1070         case 0x20:
1071                 sprintf(buf+len, "SCSI target device\n");
1072                 break;
1073         default:
1074                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1075                 ret = -EINVAL;
1076                 break;
1077         }
1078
1079         if (p_buf)
1080                 strncpy(p_buf, buf, p_buf_len);
1081         else
1082                 pr_debug("%s", buf);
1083
1084         return ret;
1085 }
1086
1087 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1088 {
1089         /*
1090          * The VPD identification association..
1091          *
1092          * from spc3r23.pdf Section 7.6.3.1 Table 297
1093          */
1094         vpd->association = (page_83[1] & 0x30);
1095         return transport_dump_vpd_assoc(vpd, NULL, 0);
1096 }
1097 EXPORT_SYMBOL(transport_set_vpd_assoc);
1098
1099 int transport_dump_vpd_ident_type(
1100         struct t10_vpd *vpd,
1101         unsigned char *p_buf,
1102         int p_buf_len)
1103 {
1104         unsigned char buf[VPD_TMP_BUF_SIZE];
1105         int ret = 0;
1106         int len;
1107
1108         memset(buf, 0, VPD_TMP_BUF_SIZE);
1109         len = sprintf(buf, "T10 VPD Identifier Type: ");
1110
1111         switch (vpd->device_identifier_type) {
1112         case 0x00:
1113                 sprintf(buf+len, "Vendor specific\n");
1114                 break;
1115         case 0x01:
1116                 sprintf(buf+len, "T10 Vendor ID based\n");
1117                 break;
1118         case 0x02:
1119                 sprintf(buf+len, "EUI-64 based\n");
1120                 break;
1121         case 0x03:
1122                 sprintf(buf+len, "NAA\n");
1123                 break;
1124         case 0x04:
1125                 sprintf(buf+len, "Relative target port identifier\n");
1126                 break;
1127         case 0x08:
1128                 sprintf(buf+len, "SCSI name string\n");
1129                 break;
1130         default:
1131                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1132                                 vpd->device_identifier_type);
1133                 ret = -EINVAL;
1134                 break;
1135         }
1136
1137         if (p_buf) {
1138                 if (p_buf_len < strlen(buf)+1)
1139                         return -EINVAL;
1140                 strncpy(p_buf, buf, p_buf_len);
1141         } else {
1142                 pr_debug("%s", buf);
1143         }
1144
1145         return ret;
1146 }
1147
1148 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1149 {
1150         /*
1151          * The VPD identifier type..
1152          *
1153          * from spc3r23.pdf Section 7.6.3.1 Table 298
1154          */
1155         vpd->device_identifier_type = (page_83[1] & 0x0f);
1156         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1157 }
1158 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1159
1160 int transport_dump_vpd_ident(
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
1168         memset(buf, 0, VPD_TMP_BUF_SIZE);
1169
1170         switch (vpd->device_identifier_code_set) {
1171         case 0x01: /* Binary */
1172                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1173                         &vpd->device_identifier[0]);
1174                 break;
1175         case 0x02: /* ASCII */
1176                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1177                         &vpd->device_identifier[0]);
1178                 break;
1179         case 0x03: /* UTF-8 */
1180                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1181                         &vpd->device_identifier[0]);
1182                 break;
1183         default:
1184                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1185                         " 0x%02x", vpd->device_identifier_code_set);
1186                 ret = -EINVAL;
1187                 break;
1188         }
1189
1190         if (p_buf)
1191                 strncpy(p_buf, buf, p_buf_len);
1192         else
1193                 pr_debug("%s", buf);
1194
1195         return ret;
1196 }
1197
1198 int
1199 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1200 {
1201         static const char hex_str[] = "0123456789abcdef";
1202         int j = 0, i = 4; /* offset to start of the identifer */
1203
1204         /*
1205          * The VPD Code Set (encoding)
1206          *
1207          * from spc3r23.pdf Section 7.6.3.1 Table 296
1208          */
1209         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1210         switch (vpd->device_identifier_code_set) {
1211         case 0x01: /* Binary */
1212                 vpd->device_identifier[j++] =
1213                                 hex_str[vpd->device_identifier_type];
1214                 while (i < (4 + page_83[3])) {
1215                         vpd->device_identifier[j++] =
1216                                 hex_str[(page_83[i] & 0xf0) >> 4];
1217                         vpd->device_identifier[j++] =
1218                                 hex_str[page_83[i] & 0x0f];
1219                         i++;
1220                 }
1221                 break;
1222         case 0x02: /* ASCII */
1223         case 0x03: /* UTF-8 */
1224                 while (i < (4 + page_83[3]))
1225                         vpd->device_identifier[j++] = page_83[i++];
1226                 break;
1227         default:
1228                 break;
1229         }
1230
1231         return transport_dump_vpd_ident(vpd, NULL, 0);
1232 }
1233 EXPORT_SYMBOL(transport_set_vpd_ident);
1234
1235 static void core_setup_task_attr_emulation(struct se_device *dev)
1236 {
1237         /*
1238          * If this device is from Target_Core_Mod/pSCSI, disable the
1239          * SAM Task Attribute emulation.
1240          *
1241          * This is currently not available in upsream Linux/SCSI Target
1242          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1243          */
1244         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1245                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1246                 return;
1247         }
1248
1249         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1250         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1251                 " device\n", dev->transport->name,
1252                 dev->transport->get_device_rev(dev));
1253 }
1254
1255 static void scsi_dump_inquiry(struct se_device *dev)
1256 {
1257         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1258         char buf[17];
1259         int i, device_type;
1260         /*
1261          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1262          */
1263         for (i = 0; i < 8; i++)
1264                 if (wwn->vendor[i] >= 0x20)
1265                         buf[i] = wwn->vendor[i];
1266                 else
1267                         buf[i] = ' ';
1268         buf[i] = '\0';
1269         pr_debug("  Vendor: %s\n", buf);
1270
1271         for (i = 0; i < 16; i++)
1272                 if (wwn->model[i] >= 0x20)
1273                         buf[i] = wwn->model[i];
1274                 else
1275                         buf[i] = ' ';
1276         buf[i] = '\0';
1277         pr_debug("  Model: %s\n", buf);
1278
1279         for (i = 0; i < 4; i++)
1280                 if (wwn->revision[i] >= 0x20)
1281                         buf[i] = wwn->revision[i];
1282                 else
1283                         buf[i] = ' ';
1284         buf[i] = '\0';
1285         pr_debug("  Revision: %s\n", buf);
1286
1287         device_type = dev->transport->get_device_type(dev);
1288         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1289         pr_debug("                 ANSI SCSI revision: %02x\n",
1290                                 dev->transport->get_device_rev(dev));
1291 }
1292
1293 struct se_device *transport_add_device_to_core_hba(
1294         struct se_hba *hba,
1295         struct se_subsystem_api *transport,
1296         struct se_subsystem_dev *se_dev,
1297         u32 device_flags,
1298         void *transport_dev,
1299         struct se_dev_limits *dev_limits,
1300         const char *inquiry_prod,
1301         const char *inquiry_rev)
1302 {
1303         int force_pt;
1304         struct se_device  *dev;
1305
1306         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1307         if (!dev) {
1308                 pr_err("Unable to allocate memory for se_dev_t\n");
1309                 return NULL;
1310         }
1311
1312         transport_init_queue_obj(&dev->dev_queue_obj);
1313         dev->dev_flags          = device_flags;
1314         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1315         dev->dev_ptr            = transport_dev;
1316         dev->se_hba             = hba;
1317         dev->se_sub_dev         = se_dev;
1318         dev->transport          = transport;
1319         INIT_LIST_HEAD(&dev->dev_list);
1320         INIT_LIST_HEAD(&dev->dev_sep_list);
1321         INIT_LIST_HEAD(&dev->dev_tmr_list);
1322         INIT_LIST_HEAD(&dev->execute_task_list);
1323         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1324         INIT_LIST_HEAD(&dev->state_task_list);
1325         INIT_LIST_HEAD(&dev->qf_cmd_list);
1326         spin_lock_init(&dev->execute_task_lock);
1327         spin_lock_init(&dev->delayed_cmd_lock);
1328         spin_lock_init(&dev->dev_reservation_lock);
1329         spin_lock_init(&dev->dev_status_lock);
1330         spin_lock_init(&dev->se_port_lock);
1331         spin_lock_init(&dev->se_tmr_lock);
1332         spin_lock_init(&dev->qf_cmd_lock);
1333         atomic_set(&dev->dev_ordered_id, 0);
1334
1335         se_dev_set_default_attribs(dev, dev_limits);
1336
1337         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1338         dev->creation_time = get_jiffies_64();
1339         spin_lock_init(&dev->stats_lock);
1340
1341         spin_lock(&hba->device_lock);
1342         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1343         hba->dev_count++;
1344         spin_unlock(&hba->device_lock);
1345         /*
1346          * Setup the SAM Task Attribute emulation for struct se_device
1347          */
1348         core_setup_task_attr_emulation(dev);
1349         /*
1350          * Force PR and ALUA passthrough emulation with internal object use.
1351          */
1352         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1353         /*
1354          * Setup the Reservations infrastructure for struct se_device
1355          */
1356         core_setup_reservations(dev, force_pt);
1357         /*
1358          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1359          */
1360         if (core_setup_alua(dev, force_pt) < 0)
1361                 goto out;
1362
1363         /*
1364          * Startup the struct se_device processing thread
1365          */
1366         dev->process_thread = kthread_run(transport_processing_thread, dev,
1367                                           "LIO_%s", dev->transport->name);
1368         if (IS_ERR(dev->process_thread)) {
1369                 pr_err("Unable to create kthread: LIO_%s\n",
1370                         dev->transport->name);
1371                 goto out;
1372         }
1373         /*
1374          * Setup work_queue for QUEUE_FULL
1375          */
1376         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1377         /*
1378          * Preload the initial INQUIRY const values if we are doing
1379          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1380          * passthrough because this is being provided by the backend LLD.
1381          * This is required so that transport_get_inquiry() copies these
1382          * originals once back into DEV_T10_WWN(dev) for the virtual device
1383          * setup.
1384          */
1385         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1386                 if (!inquiry_prod || !inquiry_rev) {
1387                         pr_err("All non TCM/pSCSI plugins require"
1388                                 " INQUIRY consts\n");
1389                         goto out;
1390                 }
1391
1392                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1393                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1394                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1395         }
1396         scsi_dump_inquiry(dev);
1397
1398         return dev;
1399 out:
1400         kthread_stop(dev->process_thread);
1401
1402         spin_lock(&hba->device_lock);
1403         list_del(&dev->dev_list);
1404         hba->dev_count--;
1405         spin_unlock(&hba->device_lock);
1406
1407         se_release_vpd_for_dev(dev);
1408
1409         kfree(dev);
1410
1411         return NULL;
1412 }
1413 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1414
1415 /*      transport_generic_prepare_cdb():
1416  *
1417  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1418  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1419  *      The point of this is since we are mapping iSCSI LUNs to
1420  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1421  *      devices and HBAs for a loop.
1422  */
1423 static inline void transport_generic_prepare_cdb(
1424         unsigned char *cdb)
1425 {
1426         switch (cdb[0]) {
1427         case READ_10: /* SBC - RDProtect */
1428         case READ_12: /* SBC - RDProtect */
1429         case READ_16: /* SBC - RDProtect */
1430         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1431         case VERIFY: /* SBC - VRProtect */
1432         case VERIFY_16: /* SBC - VRProtect */
1433         case WRITE_VERIFY: /* SBC - VRProtect */
1434         case WRITE_VERIFY_12: /* SBC - VRProtect */
1435                 break;
1436         default:
1437                 cdb[1] &= 0x1f; /* clear logical unit number */
1438                 break;
1439         }
1440 }
1441
1442 static struct se_task *
1443 transport_generic_get_task(struct se_cmd *cmd,
1444                 enum dma_data_direction data_direction)
1445 {
1446         struct se_task *task;
1447         struct se_device *dev = cmd->se_dev;
1448
1449         task = dev->transport->alloc_task(cmd->t_task_cdb);
1450         if (!task) {
1451                 pr_err("Unable to allocate struct se_task\n");
1452                 return NULL;
1453         }
1454
1455         INIT_LIST_HEAD(&task->t_list);
1456         INIT_LIST_HEAD(&task->t_execute_list);
1457         INIT_LIST_HEAD(&task->t_state_list);
1458         init_completion(&task->task_stop_comp);
1459         task->task_se_cmd = cmd;
1460         task->task_data_direction = data_direction;
1461
1462         return task;
1463 }
1464
1465 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1466
1467 /*
1468  * Used by fabric modules containing a local struct se_cmd within their
1469  * fabric dependent per I/O descriptor.
1470  */
1471 void transport_init_se_cmd(
1472         struct se_cmd *cmd,
1473         struct target_core_fabric_ops *tfo,
1474         struct se_session *se_sess,
1475         u32 data_length,
1476         int data_direction,
1477         int task_attr,
1478         unsigned char *sense_buffer)
1479 {
1480         INIT_LIST_HEAD(&cmd->se_lun_node);
1481         INIT_LIST_HEAD(&cmd->se_delayed_node);
1482         INIT_LIST_HEAD(&cmd->se_qf_node);
1483         INIT_LIST_HEAD(&cmd->se_queue_node);
1484         INIT_LIST_HEAD(&cmd->se_cmd_list);
1485         INIT_LIST_HEAD(&cmd->t_task_list);
1486         init_completion(&cmd->transport_lun_fe_stop_comp);
1487         init_completion(&cmd->transport_lun_stop_comp);
1488         init_completion(&cmd->t_transport_stop_comp);
1489         init_completion(&cmd->cmd_wait_comp);
1490         spin_lock_init(&cmd->t_state_lock);
1491         atomic_set(&cmd->transport_dev_active, 1);
1492
1493         cmd->se_tfo = tfo;
1494         cmd->se_sess = se_sess;
1495         cmd->data_length = data_length;
1496         cmd->data_direction = data_direction;
1497         cmd->sam_task_attr = task_attr;
1498         cmd->sense_buffer = sense_buffer;
1499 }
1500 EXPORT_SYMBOL(transport_init_se_cmd);
1501
1502 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1503 {
1504         /*
1505          * Check if SAM Task Attribute emulation is enabled for this
1506          * struct se_device storage object
1507          */
1508         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1509                 return 0;
1510
1511         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1512                 pr_debug("SAM Task Attribute ACA"
1513                         " emulation is not supported\n");
1514                 return -EINVAL;
1515         }
1516         /*
1517          * Used to determine when ORDERED commands should go from
1518          * Dormant to Active status.
1519          */
1520         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1521         smp_mb__after_atomic_inc();
1522         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1523                         cmd->se_ordered_id, cmd->sam_task_attr,
1524                         cmd->se_dev->transport->name);
1525         return 0;
1526 }
1527
1528 /*      transport_generic_allocate_tasks():
1529  *
1530  *      Called from fabric RX Thread.
1531  */
1532 int transport_generic_allocate_tasks(
1533         struct se_cmd *cmd,
1534         unsigned char *cdb)
1535 {
1536         int ret;
1537
1538         transport_generic_prepare_cdb(cdb);
1539         /*
1540          * Ensure that the received CDB is less than the max (252 + 8) bytes
1541          * for VARIABLE_LENGTH_CMD
1542          */
1543         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1544                 pr_err("Received SCSI CDB with command_size: %d that"
1545                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1546                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1547                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1548                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1549                 return -EINVAL;
1550         }
1551         /*
1552          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1553          * allocate the additional extended CDB buffer now..  Otherwise
1554          * setup the pointer from __t_task_cdb to t_task_cdb.
1555          */
1556         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1557                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1558                                                 GFP_KERNEL);
1559                 if (!cmd->t_task_cdb) {
1560                         pr_err("Unable to allocate cmd->t_task_cdb"
1561                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1562                                 scsi_command_size(cdb),
1563                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1564                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1565                         cmd->scsi_sense_reason =
1566                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1567                         return -ENOMEM;
1568                 }
1569         } else
1570                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1571         /*
1572          * Copy the original CDB into cmd->
1573          */
1574         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1575         /*
1576          * Setup the received CDB based on SCSI defined opcodes and
1577          * perform unit attention, persistent reservations and ALUA
1578          * checks for virtual device backends.  The cmd->t_task_cdb
1579          * pointer is expected to be setup before we reach this point.
1580          */
1581         ret = transport_generic_cmd_sequencer(cmd, cdb);
1582         if (ret < 0)
1583                 return ret;
1584         /*
1585          * Check for SAM Task Attribute Emulation
1586          */
1587         if (transport_check_alloc_task_attr(cmd) < 0) {
1588                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1589                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1590                 return -EINVAL;
1591         }
1592         spin_lock(&cmd->se_lun->lun_sep_lock);
1593         if (cmd->se_lun->lun_sep)
1594                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1595         spin_unlock(&cmd->se_lun->lun_sep_lock);
1596         return 0;
1597 }
1598 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1599
1600 /*
1601  * Used by fabric module frontends to queue tasks directly.
1602  * Many only be used from process context only
1603  */
1604 int transport_handle_cdb_direct(
1605         struct se_cmd *cmd)
1606 {
1607         int ret;
1608
1609         if (!cmd->se_lun) {
1610                 dump_stack();
1611                 pr_err("cmd->se_lun is NULL\n");
1612                 return -EINVAL;
1613         }
1614         if (in_interrupt()) {
1615                 dump_stack();
1616                 pr_err("transport_generic_handle_cdb cannot be called"
1617                                 " from interrupt context\n");
1618                 return -EINVAL;
1619         }
1620         /*
1621          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1622          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1623          * in existing usage to ensure that outstanding descriptors are handled
1624          * correctly during shutdown via transport_wait_for_tasks()
1625          *
1626          * Also, we don't take cmd->t_state_lock here as we only expect
1627          * this to be called for initial descriptor submission.
1628          */
1629         cmd->t_state = TRANSPORT_NEW_CMD;
1630         atomic_set(&cmd->t_transport_active, 1);
1631         /*
1632          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1633          * so follow TRANSPORT_NEW_CMD processing thread context usage
1634          * and call transport_generic_request_failure() if necessary..
1635          */
1636         ret = transport_generic_new_cmd(cmd);
1637         if (ret < 0)
1638                 transport_generic_request_failure(cmd);
1639
1640         return 0;
1641 }
1642 EXPORT_SYMBOL(transport_handle_cdb_direct);
1643
1644 /**
1645  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1646  *
1647  * @se_cmd: command descriptor to submit
1648  * @se_sess: associated se_sess for endpoint
1649  * @cdb: pointer to SCSI CDB
1650  * @sense: pointer to SCSI sense buffer
1651  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1652  * @data_length: fabric expected data transfer length
1653  * @task_addr: SAM task attribute
1654  * @data_dir: DMA data direction
1655  * @flags: flags for command submission from target_sc_flags_tables
1656  *
1657  * This may only be called from process context, and also currently
1658  * assumes internal allocation of fabric payload buffer by target-core.
1659  **/
1660 int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1661                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1662                 u32 data_length, int task_attr, int data_dir, int flags)
1663 {
1664         struct se_portal_group *se_tpg;
1665         int rc;
1666
1667         se_tpg = se_sess->se_tpg;
1668         BUG_ON(!se_tpg);
1669         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1670         BUG_ON(in_interrupt());
1671         /*
1672          * Initialize se_cmd for target operation.  From this point
1673          * exceptions are handled by sending exception status via
1674          * target_core_fabric_ops->queue_status() callback
1675          */
1676         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1677                                 data_length, data_dir, task_attr, sense);
1678         /*
1679          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1680          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1681          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1682          * kref_put() to happen during fabric packet acknowledgement.
1683          */
1684         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1685         /*
1686          * Signal bidirectional data payloads to target-core
1687          */
1688         if (flags & TARGET_SCF_BIDI_OP)
1689                 se_cmd->se_cmd_flags |= SCF_BIDI;
1690         /*
1691          * Locate se_lun pointer and attach it to struct se_cmd
1692          */
1693         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
1694                 goto out_check_cond;
1695         /*
1696          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1697          * allocate the necessary tasks to complete the received CDB+data
1698          */
1699         rc = transport_generic_allocate_tasks(se_cmd, cdb);
1700         if (rc != 0)
1701                 goto out_check_cond;
1702         /*
1703          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1704          * for immediate execution of READs, otherwise wait for
1705          * transport_generic_handle_data() to be called for WRITEs
1706          * when fabric has filled the incoming buffer.
1707          */
1708         transport_handle_cdb_direct(se_cmd);
1709         return 0;
1710
1711 out_check_cond:
1712         transport_send_check_condition_and_sense(se_cmd,
1713                                 se_cmd->scsi_sense_reason, 0);
1714         return 0;
1715 }
1716 EXPORT_SYMBOL(target_submit_cmd);
1717
1718 /*
1719  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1720  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1721  * complete setup in TCM process context w/ TFO->new_cmd_map().
1722  */
1723 int transport_generic_handle_cdb_map(
1724         struct se_cmd *cmd)
1725 {
1726         if (!cmd->se_lun) {
1727                 dump_stack();
1728                 pr_err("cmd->se_lun is NULL\n");
1729                 return -EINVAL;
1730         }
1731
1732         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1733         return 0;
1734 }
1735 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1736
1737 /*      transport_generic_handle_data():
1738  *
1739  *
1740  */
1741 int transport_generic_handle_data(
1742         struct se_cmd *cmd)
1743 {
1744         /*
1745          * For the software fabric case, then we assume the nexus is being
1746          * failed/shutdown when signals are pending from the kthread context
1747          * caller, so we return a failure.  For the HW target mode case running
1748          * in interrupt code, the signal_pending() check is skipped.
1749          */
1750         if (!in_interrupt() && signal_pending(current))
1751                 return -EPERM;
1752         /*
1753          * If the received CDB has aleady been ABORTED by the generic
1754          * target engine, we now call transport_check_aborted_status()
1755          * to queue any delated TASK_ABORTED status for the received CDB to the
1756          * fabric module as we are expecting no further incoming DATA OUT
1757          * sequences at this point.
1758          */
1759         if (transport_check_aborted_status(cmd, 1) != 0)
1760                 return 0;
1761
1762         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1763         return 0;
1764 }
1765 EXPORT_SYMBOL(transport_generic_handle_data);
1766
1767 /*      transport_generic_handle_tmr():
1768  *
1769  *
1770  */
1771 int transport_generic_handle_tmr(
1772         struct se_cmd *cmd)
1773 {
1774         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1775         return 0;
1776 }
1777 EXPORT_SYMBOL(transport_generic_handle_tmr);
1778
1779 /*
1780  * If the task is active, request it to be stopped and sleep until it
1781  * has completed.
1782  */
1783 bool target_stop_task(struct se_task *task, unsigned long *flags)
1784 {
1785         struct se_cmd *cmd = task->task_se_cmd;
1786         bool was_active = false;
1787
1788         if (task->task_flags & TF_ACTIVE) {
1789                 task->task_flags |= TF_REQUEST_STOP;
1790                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1791
1792                 pr_debug("Task %p waiting to complete\n", task);
1793                 wait_for_completion(&task->task_stop_comp);
1794                 pr_debug("Task %p stopped successfully\n", task);
1795
1796                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1797                 atomic_dec(&cmd->t_task_cdbs_left);
1798                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1799                 was_active = true;
1800         }
1801
1802         return was_active;
1803 }
1804
1805 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1806 {
1807         struct se_task *task, *task_tmp;
1808         unsigned long flags;
1809         int ret = 0;
1810
1811         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1812                 cmd->se_tfo->get_task_tag(cmd));
1813
1814         /*
1815          * No tasks remain in the execution queue
1816          */
1817         spin_lock_irqsave(&cmd->t_state_lock, flags);
1818         list_for_each_entry_safe(task, task_tmp,
1819                                 &cmd->t_task_list, t_list) {
1820                 pr_debug("Processing task %p\n", task);
1821                 /*
1822                  * If the struct se_task has not been sent and is not active,
1823                  * remove the struct se_task from the execution queue.
1824                  */
1825                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1826                         spin_unlock_irqrestore(&cmd->t_state_lock,
1827                                         flags);
1828                         transport_remove_task_from_execute_queue(task,
1829                                         cmd->se_dev);
1830
1831                         pr_debug("Task %p removed from execute queue\n", task);
1832                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1833                         continue;
1834                 }
1835
1836                 if (!target_stop_task(task, &flags)) {
1837                         pr_debug("Task %p - did nothing\n", task);
1838                         ret++;
1839                 }
1840         }
1841         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1842
1843         return ret;
1844 }
1845
1846 /*
1847  * Handle SAM-esque emulation for generic transport request failures.
1848  */
1849 static void transport_generic_request_failure(struct se_cmd *cmd)
1850 {
1851         int ret = 0;
1852
1853         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1854                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1855                 cmd->t_task_cdb[0]);
1856         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1857                 cmd->se_tfo->get_cmd_state(cmd),
1858                 cmd->t_state, cmd->scsi_sense_reason);
1859         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1860                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1861                 " t_transport_active: %d t_transport_stop: %d"
1862                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1863                 atomic_read(&cmd->t_task_cdbs_left),
1864                 atomic_read(&cmd->t_task_cdbs_sent),
1865                 atomic_read(&cmd->t_task_cdbs_ex_left),
1866                 atomic_read(&cmd->t_transport_active),
1867                 atomic_read(&cmd->t_transport_stop),
1868                 atomic_read(&cmd->t_transport_sent));
1869
1870         /*
1871          * For SAM Task Attribute emulation for failed struct se_cmd
1872          */
1873         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1874                 transport_complete_task_attr(cmd);
1875
1876         switch (cmd->scsi_sense_reason) {
1877         case TCM_NON_EXISTENT_LUN:
1878         case TCM_UNSUPPORTED_SCSI_OPCODE:
1879         case TCM_INVALID_CDB_FIELD:
1880         case TCM_INVALID_PARAMETER_LIST:
1881         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1882         case TCM_UNKNOWN_MODE_PAGE:
1883         case TCM_WRITE_PROTECTED:
1884         case TCM_CHECK_CONDITION_ABORT_CMD:
1885         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1886         case TCM_CHECK_CONDITION_NOT_READY:
1887                 break;
1888         case TCM_RESERVATION_CONFLICT:
1889                 /*
1890                  * No SENSE Data payload for this case, set SCSI Status
1891                  * and queue the response to $FABRIC_MOD.
1892                  *
1893                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1894                  */
1895                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1896                 /*
1897                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1898                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1899                  * CONFLICT STATUS.
1900                  *
1901                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1902                  */
1903                 if (cmd->se_sess &&
1904                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1905                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1906                                 cmd->orig_fe_lun, 0x2C,
1907                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1908
1909                 ret = cmd->se_tfo->queue_status(cmd);
1910                 if (ret == -EAGAIN || ret == -ENOMEM)
1911                         goto queue_full;
1912                 goto check_stop;
1913         default:
1914                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1915                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1916                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1917                 break;
1918         }
1919         /*
1920          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1921          * make the call to transport_send_check_condition_and_sense()
1922          * directly.  Otherwise expect the fabric to make the call to
1923          * transport_send_check_condition_and_sense() after handling
1924          * possible unsoliticied write data payloads.
1925          */
1926         ret = transport_send_check_condition_and_sense(cmd,
1927                         cmd->scsi_sense_reason, 0);
1928         if (ret == -EAGAIN || ret == -ENOMEM)
1929                 goto queue_full;
1930
1931 check_stop:
1932         transport_lun_remove_cmd(cmd);
1933         if (!transport_cmd_check_stop_to_fabric(cmd))
1934                 ;
1935         return;
1936
1937 queue_full:
1938         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1939         transport_handle_queue_full(cmd, cmd->se_dev);
1940 }
1941
1942 static inline u32 transport_lba_21(unsigned char *cdb)
1943 {
1944         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1945 }
1946
1947 static inline u32 transport_lba_32(unsigned char *cdb)
1948 {
1949         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1950 }
1951
1952 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1953 {
1954         unsigned int __v1, __v2;
1955
1956         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1957         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1958
1959         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1960 }
1961
1962 /*
1963  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1964  */
1965 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1966 {
1967         unsigned int __v1, __v2;
1968
1969         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1970         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1971
1972         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1973 }
1974
1975 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1976 {
1977         unsigned long flags;
1978
1979         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1980         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1981         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1982 }
1983
1984 /*
1985  * Called from Fabric Module context from transport_execute_tasks()
1986  *
1987  * The return of this function determins if the tasks from struct se_cmd
1988  * get added to the execution queue in transport_execute_tasks(),
1989  * or are added to the delayed or ordered lists here.
1990  */
1991 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1992 {
1993         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1994                 return 1;
1995         /*
1996          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1997          * to allow the passed struct se_cmd list of tasks to the front of the list.
1998          */
1999          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2000                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2001                         " 0x%02x, se_ordered_id: %u\n",
2002                         cmd->t_task_cdb[0],
2003                         cmd->se_ordered_id);
2004                 return 1;
2005         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2006                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2007                 smp_mb__after_atomic_inc();
2008
2009                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2010                                 " list, se_ordered_id: %u\n",
2011                                 cmd->t_task_cdb[0],
2012                                 cmd->se_ordered_id);
2013                 /*
2014                  * Add ORDERED command to tail of execution queue if
2015                  * no other older commands exist that need to be
2016                  * completed first.
2017                  */
2018                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2019                         return 1;
2020         } else {
2021                 /*
2022                  * For SIMPLE and UNTAGGED Task Attribute commands
2023                  */
2024                 atomic_inc(&cmd->se_dev->simple_cmds);
2025                 smp_mb__after_atomic_inc();
2026         }
2027         /*
2028          * Otherwise if one or more outstanding ORDERED task attribute exist,
2029          * add the dormant task(s) built for the passed struct se_cmd to the
2030          * execution queue and become in Active state for this struct se_device.
2031          */
2032         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2033                 /*
2034                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2035                  * will be drained upon completion of HEAD_OF_QUEUE task.
2036                  */
2037                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2038                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2039                 list_add_tail(&cmd->se_delayed_node,
2040                                 &cmd->se_dev->delayed_cmd_list);
2041                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2042
2043                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2044                         " delayed CMD list, se_ordered_id: %u\n",
2045                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2046                         cmd->se_ordered_id);
2047                 /*
2048                  * Return zero to let transport_execute_tasks() know
2049                  * not to add the delayed tasks to the execution list.
2050                  */
2051                 return 0;
2052         }
2053         /*
2054          * Otherwise, no ORDERED task attributes exist..
2055          */
2056         return 1;
2057 }
2058
2059 /*
2060  * Called from fabric module context in transport_generic_new_cmd() and
2061  * transport_generic_process_write()
2062  */
2063 static int transport_execute_tasks(struct se_cmd *cmd)
2064 {
2065         int add_tasks;
2066         struct se_device *se_dev = cmd->se_dev;
2067         /*
2068          * Call transport_cmd_check_stop() to see if a fabric exception
2069          * has occurred that prevents execution.
2070          */
2071         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2072                 /*
2073                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2074                  * attribute for the tasks of the received struct se_cmd CDB
2075                  */
2076                 add_tasks = transport_execute_task_attr(cmd);
2077                 if (!add_tasks)
2078                         goto execute_tasks;
2079                 /*
2080                  * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
2081                  * adds associated se_tasks while holding dev->execute_task_lock
2082                  * before I/O dispath to avoid a double spinlock access.
2083                  */
2084                 __transport_execute_tasks(se_dev, cmd);
2085                 return 0;
2086         }
2087
2088 execute_tasks:
2089         __transport_execute_tasks(se_dev, NULL);
2090         return 0;
2091 }
2092
2093 /*
2094  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2095  * from struct se_device->execute_task_list and
2096  *
2097  * Called from transport_processing_thread()
2098  */
2099 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2100 {
2101         int error;
2102         struct se_cmd *cmd = NULL;
2103         struct se_task *task = NULL;
2104         unsigned long flags;
2105
2106 check_depth:
2107         spin_lock_irq(&dev->execute_task_lock);
2108         if (new_cmd != NULL)
2109                 __transport_add_tasks_from_cmd(new_cmd);
2110
2111         if (list_empty(&dev->execute_task_list)) {
2112                 spin_unlock_irq(&dev->execute_task_lock);
2113                 return 0;
2114         }
2115         task = list_first_entry(&dev->execute_task_list,
2116                                 struct se_task, t_execute_list);
2117         __transport_remove_task_from_execute_queue(task, dev);
2118         spin_unlock_irq(&dev->execute_task_lock);
2119
2120         cmd = task->task_se_cmd;
2121         spin_lock_irqsave(&cmd->t_state_lock, flags);
2122         task->task_flags |= (TF_ACTIVE | TF_SENT);
2123         atomic_inc(&cmd->t_task_cdbs_sent);
2124
2125         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2126             cmd->t_task_list_num)
2127                 atomic_set(&cmd->t_transport_sent, 1);
2128
2129         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2130
2131         if (cmd->execute_task)
2132                 error = cmd->execute_task(task);
2133         else
2134                 error = dev->transport->do_task(task);
2135         if (error != 0) {
2136                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2137                 task->task_flags &= ~TF_ACTIVE;
2138                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2139                 atomic_set(&cmd->t_transport_sent, 0);
2140                 transport_stop_tasks_for_cmd(cmd);
2141                 transport_generic_request_failure(cmd);
2142         }
2143
2144         new_cmd = NULL;
2145         goto check_depth;
2146
2147         return 0;
2148 }
2149
2150 static inline u32 transport_get_sectors_6(
2151         unsigned char *cdb,
2152         struct se_cmd *cmd,
2153         int *ret)
2154 {
2155         struct se_device *dev = cmd->se_dev;
2156
2157         /*
2158          * Assume TYPE_DISK for non struct se_device objects.
2159          * Use 8-bit sector value.
2160          */
2161         if (!dev)
2162                 goto type_disk;
2163
2164         /*
2165          * Use 24-bit allocation length for TYPE_TAPE.
2166          */
2167         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2168                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2169
2170         /*
2171          * Everything else assume TYPE_DISK Sector CDB location.
2172          * Use 8-bit sector value.  SBC-3 says:
2173          *
2174          *   A TRANSFER LENGTH field set to zero specifies that 256
2175          *   logical blocks shall be written.  Any other value
2176          *   specifies the number of logical blocks that shall be
2177          *   written.
2178          */
2179 type_disk:
2180         return cdb[4] ? : 256;
2181 }
2182
2183 static inline u32 transport_get_sectors_10(
2184         unsigned char *cdb,
2185         struct se_cmd *cmd,
2186         int *ret)
2187 {
2188         struct se_device *dev = cmd->se_dev;
2189
2190         /*
2191          * Assume TYPE_DISK for non struct se_device objects.
2192          * Use 16-bit sector value.
2193          */
2194         if (!dev)
2195                 goto type_disk;
2196
2197         /*
2198          * XXX_10 is not defined in SSC, throw an exception
2199          */
2200         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2201                 *ret = -EINVAL;
2202                 return 0;
2203         }
2204
2205         /*
2206          * Everything else assume TYPE_DISK Sector CDB location.
2207          * Use 16-bit sector value.
2208          */
2209 type_disk:
2210         return (u32)(cdb[7] << 8) + cdb[8];
2211 }
2212
2213 static inline u32 transport_get_sectors_12(
2214         unsigned char *cdb,
2215         struct se_cmd *cmd,
2216         int *ret)
2217 {
2218         struct se_device *dev = cmd->se_dev;
2219
2220         /*
2221          * Assume TYPE_DISK for non struct se_device objects.
2222          * Use 32-bit sector value.
2223          */
2224         if (!dev)
2225                 goto type_disk;
2226
2227         /*
2228          * XXX_12 is not defined in SSC, throw an exception
2229          */
2230         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2231                 *ret = -EINVAL;
2232                 return 0;
2233         }
2234
2235         /*
2236          * Everything else assume TYPE_DISK Sector CDB location.
2237          * Use 32-bit sector value.
2238          */
2239 type_disk:
2240         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2241 }
2242
2243 static inline u32 transport_get_sectors_16(
2244         unsigned char *cdb,
2245         struct se_cmd *cmd,
2246         int *ret)
2247 {
2248         struct se_device *dev = cmd->se_dev;
2249
2250         /*
2251          * Assume TYPE_DISK for non struct se_device objects.
2252          * Use 32-bit sector value.
2253          */
2254         if (!dev)
2255                 goto type_disk;
2256
2257         /*
2258          * Use 24-bit allocation length for TYPE_TAPE.
2259          */
2260         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2261                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2262
2263 type_disk:
2264         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2265                     (cdb[12] << 8) + cdb[13];
2266 }
2267
2268 /*
2269  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2270  */
2271 static inline u32 transport_get_sectors_32(
2272         unsigned char *cdb,
2273         struct se_cmd *cmd,
2274         int *ret)
2275 {
2276         /*
2277          * Assume TYPE_DISK for non struct se_device objects.
2278          * Use 32-bit sector value.
2279          */
2280         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2281                     (cdb[30] << 8) + cdb[31];
2282
2283 }
2284
2285 static inline u32 transport_get_size(
2286         u32 sectors,
2287         unsigned char *cdb,
2288         struct se_cmd *cmd)
2289 {
2290         struct se_device *dev = cmd->se_dev;
2291
2292         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2293                 if (cdb[1] & 1) { /* sectors */
2294                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2295                 } else /* bytes */
2296                         return sectors;
2297         }
2298 #if 0
2299         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2300                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2301                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2302                         dev->transport->name);
2303 #endif
2304         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2305 }
2306
2307 static void transport_xor_callback(struct se_cmd *cmd)
2308 {
2309         unsigned char *buf, *addr;
2310         struct scatterlist *sg;
2311         unsigned int offset;
2312         int i;
2313         int count;
2314         /*
2315          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2316          *
2317          * 1) read the specified logical block(s);
2318          * 2) transfer logical blocks from the data-out buffer;
2319          * 3) XOR the logical blocks transferred from the data-out buffer with
2320          *    the logical blocks read, storing the resulting XOR data in a buffer;
2321          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2322          *    blocks transferred from the data-out buffer; and
2323          * 5) transfer the resulting XOR data to the data-in buffer.
2324          */
2325         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2326         if (!buf) {
2327                 pr_err("Unable to allocate xor_callback buf\n");
2328                 return;
2329         }
2330         /*
2331          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2332          * into the locally allocated *buf
2333          */
2334         sg_copy_to_buffer(cmd->t_data_sg,
2335                           cmd->t_data_nents,
2336                           buf,
2337                           cmd->data_length);
2338
2339         /*
2340          * Now perform the XOR against the BIDI read memory located at
2341          * cmd->t_mem_bidi_list
2342          */
2343
2344         offset = 0;
2345         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2346                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2347                 if (!addr)
2348                         goto out;
2349
2350                 for (i = 0; i < sg->length; i++)
2351                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2352
2353                 offset += sg->length;
2354                 kunmap_atomic(addr, KM_USER0);
2355         }
2356
2357 out:
2358         kfree(buf);
2359 }
2360
2361 /*
2362  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2363  */
2364 static int transport_get_sense_data(struct se_cmd *cmd)
2365 {
2366         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2367         struct se_device *dev = cmd->se_dev;
2368         struct se_task *task = NULL, *task_tmp;
2369         unsigned long flags;
2370         u32 offset = 0;
2371
2372         WARN_ON(!cmd->se_lun);
2373
2374         if (!dev)
2375                 return 0;
2376
2377         spin_lock_irqsave(&cmd->t_state_lock, flags);
2378         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2379                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2380                 return 0;
2381         }
2382
2383         list_for_each_entry_safe(task, task_tmp,
2384                                 &cmd->t_task_list, t_list) {
2385                 if (!(task->task_flags & TF_HAS_SENSE))
2386                         continue;
2387
2388                 if (!dev->transport->get_sense_buffer) {
2389                         pr_err("dev->transport->get_sense_buffer"
2390                                         " is NULL\n");
2391                         continue;
2392                 }
2393
2394                 sense_buffer = dev->transport->get_sense_buffer(task);
2395                 if (!sense_buffer) {
2396                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2397                                 " sense buffer for task with sense\n",
2398                                 cmd->se_tfo->get_task_tag(cmd), task);
2399                         continue;
2400                 }
2401                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2402
2403                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2404                                 TRANSPORT_SENSE_BUFFER);
2405
2406                 memcpy(&buffer[offset], sense_buffer,
2407                                 TRANSPORT_SENSE_BUFFER);
2408                 cmd->scsi_status = task->task_scsi_status;
2409                 /* Automatically padded */
2410                 cmd->scsi_sense_length =
2411                                 (TRANSPORT_SENSE_BUFFER + offset);
2412
2413                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2414                                 " and sense\n",
2415                         dev->se_hba->hba_id, dev->transport->name,
2416                                 cmd->scsi_status);
2417                 return 0;
2418         }
2419         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2420
2421         return -1;
2422 }
2423
2424 static inline long long transport_dev_end_lba(struct se_device *dev)
2425 {
2426         return dev->transport->get_blocks(dev) + 1;
2427 }
2428
2429 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2430 {
2431         struct se_device *dev = cmd->se_dev;
2432         u32 sectors;
2433
2434         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2435                 return 0;
2436
2437         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2438
2439         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2440                 pr_err("LBA: %llu Sectors: %u exceeds"
2441                         " transport_dev_end_lba(): %llu\n",
2442                         cmd->t_task_lba, sectors,
2443                         transport_dev_end_lba(dev));
2444                 return -EINVAL;
2445         }
2446
2447         return 0;
2448 }
2449
2450 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2451 {
2452         /*
2453          * Determine if the received WRITE_SAME is used to for direct
2454          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2455          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2456          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2457          */
2458         int passthrough = (dev->transport->transport_type ==
2459                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2460
2461         if (!passthrough) {
2462                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2463                         pr_err("WRITE_SAME PBDATA and LBDATA"
2464                                 " bits not supported for Block Discard"
2465                                 " Emulation\n");
2466                         return -ENOSYS;
2467                 }
2468                 /*
2469                  * Currently for the emulated case we only accept
2470                  * tpws with the UNMAP=1 bit set.
2471                  */
2472                 if (!(flags[0] & 0x08)) {
2473                         pr_err("WRITE_SAME w/o UNMAP bit not"
2474                                 " supported for Block Discard Emulation\n");
2475                         return -ENOSYS;
2476                 }
2477         }
2478
2479         return 0;
2480 }
2481
2482 /*      transport_generic_cmd_sequencer():
2483  *
2484  *      Generic Command Sequencer that should work for most DAS transport
2485  *      drivers.
2486  *
2487  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2488  *      RX Thread.
2489  *
2490  *      FIXME: Need to support other SCSI OPCODES where as well.
2491  */
2492 static int transport_generic_cmd_sequencer(
2493         struct se_cmd *cmd,
2494         unsigned char *cdb)
2495 {
2496         struct se_device *dev = cmd->se_dev;
2497         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2498         int ret = 0, sector_ret = 0, passthrough;
2499         u32 sectors = 0, size = 0, pr_reg_type = 0;
2500         u16 service_action;
2501         u8 alua_ascq = 0;
2502         /*
2503          * Check for an existing UNIT ATTENTION condition
2504          */
2505         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2506                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2507                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2508                 return -EINVAL;
2509         }
2510         /*
2511          * Check status of Asymmetric Logical Unit Assignment port
2512          */
2513         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2514         if (ret != 0) {
2515                 /*
2516                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2517                  * The ALUA additional sense code qualifier (ASCQ) is determined
2518                  * by the ALUA primary or secondary access state..
2519                  */
2520                 if (ret > 0) {
2521 #if 0
2522                         pr_debug("[%s]: ALUA TG Port not available,"
2523                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2524                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2525 #endif
2526                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2527                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2528                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2529                         return -EINVAL;
2530                 }
2531                 goto out_invalid_cdb_field;
2532         }
2533         /*
2534          * Check status for SPC-3 Persistent Reservations
2535          */
2536         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2537                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2538                                         cmd, cdb, pr_reg_type) != 0) {
2539                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2540                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2541                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2542                         return -EBUSY;
2543                 }
2544                 /*
2545                  * This means the CDB is allowed for the SCSI Initiator port
2546                  * when said port is *NOT* holding the legacy SPC-2 or
2547                  * SPC-3 Persistent Reservation.
2548                  */
2549         }
2550
2551         /*
2552          * If we operate in passthrough mode we skip most CDB emulation and
2553          * instead hand the commands down to the physical SCSI device.
2554          */
2555         passthrough =
2556                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2557
2558         switch (cdb[0]) {
2559         case READ_6:
2560                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2561                 if (sector_ret)
2562                         goto out_unsupported_cdb;
2563                 size = transport_get_size(sectors, cdb, cmd);
2564                 cmd->t_task_lba = transport_lba_21(cdb);
2565                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2566                 break;
2567         case READ_10:
2568                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2569                 if (sector_ret)
2570                         goto out_unsupported_cdb;
2571                 size = transport_get_size(sectors, cdb, cmd);
2572                 cmd->t_task_lba = transport_lba_32(cdb);
2573                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2574                 break;
2575         case READ_12:
2576                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2577                 if (sector_ret)
2578                         goto out_unsupported_cdb;
2579                 size = transport_get_size(sectors, cdb, cmd);
2580                 cmd->t_task_lba = transport_lba_32(cdb);
2581                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2582                 break;
2583         case READ_16:
2584                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2585                 if (sector_ret)
2586                         goto out_unsupported_cdb;
2587                 size = transport_get_size(sectors, cdb, cmd);
2588                 cmd->t_task_lba = transport_lba_64(cdb);
2589                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2590                 break;
2591         case WRITE_6:
2592                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2593                 if (sector_ret)
2594                         goto out_unsupported_cdb;
2595                 size = transport_get_size(sectors, cdb, cmd);
2596                 cmd->t_task_lba = transport_lba_21(cdb);
2597                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2598                 break;
2599         case WRITE_10:
2600                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2601                 if (sector_ret)
2602                         goto out_unsupported_cdb;
2603                 size = transport_get_size(sectors, cdb, cmd);
2604                 cmd->t_task_lba = transport_lba_32(cdb);
2605                 if (cdb[1] & 0x8)
2606                         cmd->se_cmd_flags |= SCF_FUA;
2607                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2608                 break;
2609         case WRITE_12:
2610                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2611                 if (sector_ret)
2612                         goto out_unsupported_cdb;
2613                 size = transport_get_size(sectors, cdb, cmd);
2614                 cmd->t_task_lba = transport_lba_32(cdb);
2615                 if (cdb[1] & 0x8)
2616                         cmd->se_cmd_flags |= SCF_FUA;
2617                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2618                 break;
2619         case WRITE_16:
2620                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2621                 if (sector_ret)
2622                         goto out_unsupported_cdb;
2623                 size = transport_get_size(sectors, cdb, cmd);
2624                 cmd->t_task_lba = transport_lba_64(cdb);
2625                 if (cdb[1] & 0x8)
2626                         cmd->se_cmd_flags |= SCF_FUA;
2627                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2628                 break;
2629         case XDWRITEREAD_10:
2630                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2631                     !(cmd->se_cmd_flags & SCF_BIDI))
2632                         goto out_invalid_cdb_field;
2633                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2634                 if (sector_ret)
2635                         goto out_unsupported_cdb;
2636                 size = transport_get_size(sectors, cdb, cmd);
2637                 cmd->t_task_lba = transport_lba_32(cdb);
2638                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2639
2640                 /*
2641                  * Do now allow BIDI commands for passthrough mode.
2642                  */
2643                 if (passthrough)
2644                         goto out_unsupported_cdb;
2645
2646                 /*
2647                  * Setup BIDI XOR callback to be run after I/O completion.
2648                  */
2649                 cmd->transport_complete_callback = &transport_xor_callback;
2650                 if (cdb[1] & 0x8)
2651                         cmd->se_cmd_flags |= SCF_FUA;
2652                 break;
2653         case VARIABLE_LENGTH_CMD:
2654                 service_action = get_unaligned_be16(&cdb[8]);
2655                 switch (service_action) {
2656                 case XDWRITEREAD_32:
2657                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2658                         if (sector_ret)
2659                                 goto out_unsupported_cdb;
2660                         size = transport_get_size(sectors, cdb, cmd);
2661                         /*
2662                          * Use WRITE_32 and READ_32 opcodes for the emulated
2663                          * XDWRITE_READ_32 logic.
2664                          */
2665                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2666                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2667
2668                         /*
2669                          * Do now allow BIDI commands for passthrough mode.
2670                          */
2671                         if (passthrough)
2672                                 goto out_unsupported_cdb;
2673
2674                         /*
2675                          * Setup BIDI XOR callback to be run during after I/O
2676                          * completion.
2677                          */
2678                         cmd->transport_complete_callback = &transport_xor_callback;
2679                         if (cdb[1] & 0x8)
2680                                 cmd->se_cmd_flags |= SCF_FUA;
2681                         break;
2682                 case WRITE_SAME_32:
2683                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2684                         if (sector_ret)
2685                                 goto out_unsupported_cdb;
2686
2687                         if (sectors)
2688                                 size = transport_get_size(1, cdb, cmd);
2689                         else {
2690                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2691                                        " supported\n");
2692                                 goto out_invalid_cdb_field;
2693                         }
2694
2695                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2696                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2697
2698                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2699                                 goto out_invalid_cdb_field;
2700                         if (!passthrough)
2701                                 cmd->execute_task = target_emulate_write_same;
2702                         break;
2703                 default:
2704                         pr_err("VARIABLE_LENGTH_CMD service action"
2705                                 " 0x%04x not supported\n", service_action);
2706                         goto out_unsupported_cdb;
2707                 }
2708                 break;
2709         case MAINTENANCE_IN:
2710                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2711                         /* MAINTENANCE_IN from SCC-2 */
2712                         /*
2713                          * Check for emulated MI_REPORT_TARGET_PGS.
2714                          */
2715                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2716                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2717                                 cmd->execute_task =
2718                                         target_emulate_report_target_port_groups;
2719                         }
2720                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2721                                (cdb[8] << 8) | cdb[9];
2722                 } else {
2723                         /* GPCMD_SEND_KEY from multi media commands */
2724                         size = (cdb[8] << 8) + cdb[9];
2725                 }
2726                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2727                 break;
2728         case MODE_SELECT:
2729                 size = cdb[4];
2730                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2731                 break;
2732         case MODE_SELECT_10:
2733                 size = (cdb[7] << 8) + cdb[8];
2734                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2735                 break;
2736         case MODE_SENSE:
2737                 size = cdb[4];
2738                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2739                 if (!passthrough)
2740                         cmd->execute_task = target_emulate_modesense;
2741                 break;
2742         case MODE_SENSE_10:
2743                 size = (cdb[7] << 8) + cdb[8];
2744                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2745                 if (!passthrough)
2746                         cmd->execute_task = target_emulate_modesense;
2747                 break;
2748         case GPCMD_READ_BUFFER_CAPACITY:
2749         case GPCMD_SEND_OPC:
2750         case LOG_SELECT:
2751         case LOG_SENSE:
2752                 size = (cdb[7] << 8) + cdb[8];
2753                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2754                 break;
2755         case READ_BLOCK_LIMITS:
2756                 size = READ_BLOCK_LEN;
2757                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2758                 break;
2759         case GPCMD_GET_CONFIGURATION:
2760         case GPCMD_READ_FORMAT_CAPACITIES:
2761         case GPCMD_READ_DISC_INFO:
2762         case GPCMD_READ_TRACK_RZONE_INFO:
2763                 size = (cdb[7] << 8) + cdb[8];
2764                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2765                 break;
2766         case PERSISTENT_RESERVE_IN:
2767                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2768                         cmd->execute_task = target_scsi3_emulate_pr_in;
2769                 size = (cdb[7] << 8) + cdb[8];
2770                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2771                 break;
2772         case PERSISTENT_RESERVE_OUT:
2773                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2774                         cmd->execute_task = target_scsi3_emulate_pr_out;
2775                 size = (cdb[7] << 8) + cdb[8];
2776                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2777                 break;
2778         case GPCMD_MECHANISM_STATUS:
2779         case GPCMD_READ_DVD_STRUCTURE:
2780                 size = (cdb[8] << 8) + cdb[9];
2781                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2782                 break;
2783         case READ_POSITION:
2784                 size = READ_POSITION_LEN;
2785                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2786                 break;
2787         case MAINTENANCE_OUT:
2788                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2789                         /* MAINTENANCE_OUT from SCC-2
2790                          *
2791                          * Check for emulated MO_SET_TARGET_PGS.
2792                          */
2793                         if (cdb[1] == MO_SET_TARGET_PGS &&
2794                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2795                                 cmd->execute_task =
2796                                         target_emulate_set_target_port_groups;
2797                         }
2798
2799                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2800                                (cdb[8] << 8) | cdb[9];
2801                 } else  {
2802                         /* GPCMD_REPORT_KEY from multi media commands */
2803                         size = (cdb[8] << 8) + cdb[9];
2804                 }
2805                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2806                 break;
2807         case INQUIRY:
2808                 size = (cdb[3] << 8) + cdb[4];
2809                 /*
2810                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2811                  * See spc4r17 section 5.3
2812                  */
2813                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2814                         cmd->sam_task_attr = MSG_HEAD_TAG;
2815                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2816                 if (!passthrough)
2817                         cmd->execute_task = target_emulate_inquiry;
2818                 break;
2819         case READ_BUFFER:
2820                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2821                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2822                 break;
2823         case READ_CAPACITY:
2824                 size = READ_CAP_LEN;
2825                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2826                 if (!passthrough)
2827                         cmd->execute_task = target_emulate_readcapacity;
2828                 break;
2829         case READ_MEDIA_SERIAL_NUMBER:
2830         case SECURITY_PROTOCOL_IN:
2831         case SECURITY_PROTOCOL_OUT:
2832                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2833                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2834                 break;
2835         case SERVICE_ACTION_IN:
2836                 switch (cmd->t_task_cdb[1] & 0x1f) {
2837                 case SAI_READ_CAPACITY_16:
2838                         if (!passthrough)
2839                                 cmd->execute_task =
2840                                         target_emulate_readcapacity_16;
2841                         break;
2842                 default:
2843                         if (passthrough)
2844                                 break;
2845
2846                         pr_err("Unsupported SA: 0x%02x\n",
2847                                 cmd->t_task_cdb[1] & 0x1f);
2848                         goto out_unsupported_cdb;
2849                 }
2850                 /*FALLTHROUGH*/
2851         case ACCESS_CONTROL_IN:
2852         case ACCESS_CONTROL_OUT:
2853         case EXTENDED_COPY:
2854         case READ_ATTRIBUTE:
2855         case RECEIVE_COPY_RESULTS:
2856         case WRITE_ATTRIBUTE:
2857                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2858                        (cdb[12] << 8) | cdb[13];
2859                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2860                 break;
2861         case RECEIVE_DIAGNOSTIC:
2862         case SEND_DIAGNOSTIC:
2863                 size = (cdb[3] << 8) | cdb[4];
2864                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2865                 break;
2866 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2867 #if 0
2868         case GPCMD_READ_CD:
2869                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2870                 size = (2336 * sectors);
2871                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2872                 break;
2873 #endif
2874         case READ_TOC:
2875                 size = cdb[8];
2876                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2877                 break;
2878         case REQUEST_SENSE:
2879                 size = cdb[4];
2880                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2881                 if (!passthrough)
2882                         cmd->execute_task = target_emulate_request_sense;
2883                 break;
2884         case READ_ELEMENT_STATUS:
2885                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2886                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2887                 break;
2888         case WRITE_BUFFER:
2889                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2890                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2891                 break;
2892         case RESERVE:
2893         case RESERVE_10:
2894                 /*
2895                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2896                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2897                  */
2898                 if (cdb[0] == RESERVE_10)
2899                         size = (cdb[7] << 8) | cdb[8];
2900                 else
2901                         size = cmd->data_length;
2902
2903                 /*
2904                  * Setup the legacy emulated handler for SPC-2 and
2905                  * >= SPC-3 compatible reservation handling (CRH=1)
2906                  * Otherwise, we assume the underlying SCSI logic is
2907                  * is running in SPC_PASSTHROUGH, and wants reservations
2908                  * emulation disabled.
2909                  */
2910                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2911                         cmd->execute_task = target_scsi2_reservation_reserve;
2912                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2913                 break;
2914         case RELEASE:
2915         case RELEASE_10:
2916                 /*
2917                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2918                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2919                 */
2920                 if (cdb[0] == RELEASE_10)
2921                         size = (cdb[7] << 8) | cdb[8];
2922                 else
2923                         size = cmd->data_length;
2924
2925                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2926                         cmd->execute_task = target_scsi2_reservation_release;
2927                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2928                 break;
2929         case SYNCHRONIZE_CACHE:
2930         case 0x91: /* SYNCHRONIZE_CACHE_16: */
2931                 /*
2932                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2933                  */
2934                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2935                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2936                         cmd->t_task_lba = transport_lba_32(cdb);
2937                 } else {
2938                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2939                         cmd->t_task_lba = transport_lba_64(cdb);
2940                 }
2941                 if (sector_ret)
2942                         goto out_unsupported_cdb;
2943
2944                 size = transport_get_size(sectors, cdb, cmd);
2945                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2946
2947                 if (passthrough)
2948                         break;
2949
2950                 /*
2951                  * Check to ensure that LBA + Range does not exceed past end of
2952                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2953                  */
2954                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2955                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2956                                 goto out_invalid_cdb_field;
2957                 }
2958                 cmd->execute_task = target_emulate_synchronize_cache;
2959                 break;
2960         case UNMAP:
2961                 size = get_unaligned_be16(&cdb[7]);
2962                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2963                 if (!passthrough)
2964                         cmd->execute_task = target_emulate_unmap;
2965                 break;
2966         case WRITE_SAME_16:
2967                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2968                 if (sector_ret)
2969                         goto out_unsupported_cdb;
2970
2971                 if (sectors)
2972                         size = transport_get_size(1, cdb, cmd);
2973                 else {
2974                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2975                         goto out_invalid_cdb_field;
2976                 }
2977
2978                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2979                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2980
2981                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2982                         goto out_invalid_cdb_field;
2983                 if (!passthrough)
2984                         cmd->execute_task = target_emulate_write_same;
2985                 break;
2986         case WRITE_SAME:
2987                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2988                 if (sector_ret)
2989                         goto out_unsupported_cdb;
2990
2991                 if (sectors)
2992                         size = transport_get_size(1, cdb, cmd);
2993                 else {
2994                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2995                         goto out_invalid_cdb_field;
2996                 }
2997
2998                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2999                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3000                 /*
3001                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3002                  * of byte 1 bit 3 UNMAP instead of original reserved field
3003                  */
3004                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3005                         goto out_invalid_cdb_field;
3006                 if (!passthrough)
3007                         cmd->execute_task = target_emulate_write_same;
3008                 break;
3009         case ALLOW_MEDIUM_REMOVAL:
3010         case ERASE:
3011         case REZERO_UNIT:
3012         case SEEK_10:
3013         case SPACE:
3014         case START_STOP:
3015         case TEST_UNIT_READY:
3016         case VERIFY:
3017         case WRITE_FILEMARKS:
3018                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3019                 if (!passthrough)
3020                         cmd->execute_task = target_emulate_noop;
3021                 break;
3022         case GPCMD_CLOSE_TRACK:
3023         case INITIALIZE_ELEMENT_STATUS:
3024         case GPCMD_LOAD_UNLOAD:
3025         case GPCMD_SET_SPEED:
3026         case MOVE_MEDIUM:
3027                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3028                 break;
3029         case REPORT_LUNS:
3030                 cmd->execute_task = target_report_luns;
3031                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3032                 /*
3033                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3034                  * See spc4r17 section 5.3
3035                  */
3036                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3037                         cmd->sam_task_attr = MSG_HEAD_TAG;
3038                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3039                 break;
3040         default:
3041                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3042                         " 0x%02x, sending CHECK_CONDITION.\n",
3043                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3044                 goto out_unsupported_cdb;
3045         }
3046
3047         if (size != cmd->data_length) {
3048                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3049                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3050                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3051                                 cmd->data_length, size, cdb[0]);
3052
3053                 cmd->cmd_spdtl = size;
3054
3055                 if (cmd->data_direction == DMA_TO_DEVICE) {
3056                         pr_err("Rejecting underflow/overflow"
3057                                         " WRITE data\n");
3058                         goto out_invalid_cdb_field;
3059                 }
3060                 /*
3061                  * Reject READ_* or WRITE_* with overflow/underflow for
3062                  * type SCF_SCSI_DATA_SG_IO_CDB.
3063                  */
3064                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3065                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3066                                 " CDB on non 512-byte sector setup subsystem"
3067                                 " plugin: %s\n", dev->transport->name);
3068                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3069                         goto out_invalid_cdb_field;
3070                 }
3071
3072                 if (size > cmd->data_length) {
3073                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3074                         cmd->residual_count = (size - cmd->data_length);
3075                 } else {
3076                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3077                         cmd->residual_count = (cmd->data_length - size);
3078                 }
3079                 cmd->data_length = size;
3080         }
3081
3082         /* reject any command that we don't have a handler for */
3083         if (!(passthrough || cmd->execute_task ||
3084              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3085                 goto out_unsupported_cdb;
3086
3087         /* Let's limit control cdbs to a page, for simplicity's sake. */
3088         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3089             size > PAGE_SIZE)
3090                 goto out_invalid_cdb_field;
3091
3092         transport_set_supported_SAM_opcode(cmd);
3093         return ret;
3094
3095 out_unsupported_cdb:
3096         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3097         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3098         return -EINVAL;
3099 out_invalid_cdb_field:
3100         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3101         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3102         return -EINVAL;
3103 }
3104
3105 /*
3106  * Called from I/O completion to determine which dormant/delayed
3107  * and ordered cmds need to have their tasks added to the execution queue.
3108  */
3109 static void transport_complete_task_attr(struct se_cmd *cmd)
3110 {
3111         struct se_device *dev = cmd->se_dev;
3112         struct se_cmd *cmd_p, *cmd_tmp;
3113         int new_active_tasks = 0;
3114
3115         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3116                 atomic_dec(&dev->simple_cmds);
3117                 smp_mb__after_atomic_dec();
3118                 dev->dev_cur_ordered_id++;
3119                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3120                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3121                         cmd->se_ordered_id);
3122         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3123                 dev->dev_cur_ordered_id++;
3124                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3125                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3126                         cmd->se_ordered_id);
3127         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3128                 atomic_dec(&dev->dev_ordered_sync);
3129                 smp_mb__after_atomic_dec();
3130
3131                 dev->dev_cur_ordered_id++;
3132                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3133                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3134         }
3135         /*
3136          * Process all commands up to the last received
3137          * ORDERED task attribute which requires another blocking
3138          * boundary
3139          */
3140         spin_lock(&dev->delayed_cmd_lock);
3141         list_for_each_entry_safe(cmd_p, cmd_tmp,
3142                         &dev->delayed_cmd_list, se_delayed_node) {
3143
3144                 list_del(&cmd_p->se_delayed_node);
3145                 spin_unlock(&dev->delayed_cmd_lock);
3146
3147                 pr_debug("Calling add_tasks() for"
3148                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3149                         " Dormant -> Active, se_ordered_id: %u\n",
3150                         cmd_p->t_task_cdb[0],
3151                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3152
3153                 transport_add_tasks_from_cmd(cmd_p);
3154                 new_active_tasks++;
3155
3156                 spin_lock(&dev->delayed_cmd_lock);
3157                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3158                         break;
3159         }
3160         spin_unlock(&dev->delayed_cmd_lock);
3161         /*
3162          * If new tasks have become active, wake up the transport thread
3163          * to do the processing of the Active tasks.
3164          */
3165         if (new_active_tasks != 0)
3166                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3167 }
3168
3169 static void transport_complete_qf(struct se_cmd *cmd)
3170 {
3171         int ret = 0;
3172
3173         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3174                 transport_complete_task_attr(cmd);
3175
3176         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3177                 ret = cmd->se_tfo->queue_status(cmd);
3178                 if (ret)
3179                         goto out;
3180         }
3181
3182         switch (cmd->data_direction) {
3183         case DMA_FROM_DEVICE:
3184                 ret = cmd->se_tfo->queue_data_in(cmd);
3185                 break;
3186         case DMA_TO_DEVICE:
3187                 if (cmd->t_bidi_data_sg) {
3188                         ret = cmd->se_tfo->queue_data_in(cmd);
3189                         if (ret < 0)
3190                                 break;
3191                 }
3192                 /* Fall through for DMA_TO_DEVICE */
3193         case DMA_NONE:
3194                 ret = cmd->se_tfo->queue_status(cmd);
3195                 break;
3196         default:
3197                 break;
3198         }
3199
3200 out:
3201         if (ret < 0) {
3202                 transport_handle_queue_full(cmd, cmd->se_dev);
3203                 return;
3204         }
3205         transport_lun_remove_cmd(cmd);
3206         transport_cmd_check_stop_to_fabric(cmd);
3207 }
3208
3209 static void transport_handle_queue_full(
3210         struct se_cmd *cmd,
3211         struct se_device *dev)
3212 {
3213         spin_lock_irq(&dev->qf_cmd_lock);
3214         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3215         atomic_inc(&dev->dev_qf_count);
3216         smp_mb__after_atomic_inc();
3217         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3218
3219         schedule_work(&cmd->se_dev->qf_work_queue);
3220 }
3221
3222 static void target_complete_ok_work(struct work_struct *work)
3223 {
3224         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3225         int reason = 0, ret;
3226
3227         /*
3228          * Check if we need to move delayed/dormant tasks from cmds on the
3229          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3230          * Attribute.
3231          */
3232         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3233                 transport_complete_task_attr(cmd);
3234         /*
3235          * Check to schedule QUEUE_FULL work, or execute an existing
3236          * cmd->transport_qf_callback()
3237          */
3238         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3239                 schedule_work(&cmd->se_dev->qf_work_queue);
3240
3241         /*
3242          * Check if we need to retrieve a sense buffer from
3243          * the struct se_cmd in question.
3244          */
3245         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3246                 if (transport_get_sense_data(cmd) < 0)
3247                         reason = TCM_NON_EXISTENT_LUN;
3248
3249                 /*
3250                  * Only set when an struct se_task->task_scsi_status returned
3251                  * a non GOOD status.
3252                  */
3253                 if (cmd->scsi_status) {
3254                         ret = transport_send_check_condition_and_sense(
3255                                         cmd, reason, 1);
3256                         if (ret == -EAGAIN || ret == -ENOMEM)
3257                                 goto queue_full;
3258
3259                         transport_lun_remove_cmd(cmd);
3260                         transport_cmd_check_stop_to_fabric(cmd);
3261                         return;
3262                 }
3263         }
3264         /*
3265          * Check for a callback, used by amongst other things
3266          * XDWRITE_READ_10 emulation.
3267          */
3268         if (cmd->transport_complete_callback)
3269                 cmd->transport_complete_callback(cmd);
3270
3271         switch (cmd->data_direction) {
3272         case DMA_FROM_DEVICE:
3273                 spin_lock(&cmd->se_lun->lun_sep_lock);
3274                 if (cmd->se_lun->lun_sep) {
3275                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3276                                         cmd->data_length;
3277                 }
3278                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3279
3280                 ret = cmd->se_tfo->queue_data_in(cmd);
3281                 if (ret == -EAGAIN || ret == -ENOMEM)
3282                         goto queue_full;
3283                 break;
3284         case DMA_TO_DEVICE:
3285                 spin_lock(&cmd->se_lun->lun_sep_lock);
3286                 if (cmd->se_lun->lun_sep) {
3287                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3288                                 cmd->data_length;
3289                 }
3290                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3291                 /*
3292                  * Check if we need to send READ payload for BIDI-COMMAND
3293                  */
3294                 if (cmd->t_bidi_data_sg) {
3295                         spin_lock(&cmd->se_lun->lun_sep_lock);
3296                         if (cmd->se_lun->lun_sep) {
3297                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3298                                         cmd->data_length;
3299                         }
3300                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3301                         ret = cmd->se_tfo->queue_data_in(cmd);
3302                         if (ret == -EAGAIN || ret == -ENOMEM)
3303                                 goto queue_full;
3304                         break;
3305                 }
3306                 /* Fall through for DMA_TO_DEVICE */
3307         case DMA_NONE:
3308                 ret = cmd->se_tfo->queue_status(cmd);
3309                 if (ret == -EAGAIN || ret == -ENOMEM)
3310                         goto queue_full;
3311                 break;
3312         default:
3313                 break;
3314         }
3315
3316         transport_lun_remove_cmd(cmd);
3317         transport_cmd_check_stop_to_fabric(cmd);
3318         return;
3319
3320 queue_full:
3321         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3322                 " data_direction: %d\n", cmd, cmd->data_direction);
3323         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3324         transport_handle_queue_full(cmd, cmd->se_dev);
3325 }
3326
3327 static void transport_free_dev_tasks(struct se_cmd *cmd)
3328 {
3329         struct se_task *task, *task_tmp;
3330         unsigned long flags;
3331         LIST_HEAD(dispose_list);
3332
3333         spin_lock_irqsave(&cmd->t_state_lock, flags);
3334         list_for_each_entry_safe(task, task_tmp,
3335                                 &cmd->t_task_list, t_list) {
3336                 if (!(task->task_flags & TF_ACTIVE))
3337                         list_move_tail(&task->t_list, &dispose_list);
3338         }
3339         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3340
3341         while (!list_empty(&dispose_list)) {
3342                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3343
3344                 if (task->task_sg != cmd->t_data_sg &&
3345                     task->task_sg != cmd->t_bidi_data_sg)
3346                         kfree(task->task_sg);
3347
3348                 list_del(&task->t_list);
3349
3350                 cmd->se_dev->transport->free_task(task);
3351         }
3352 }
3353
3354 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3355 {
3356         struct scatterlist *sg;
3357         int count;
3358
3359         for_each_sg(sgl, sg, nents, count)
3360                 __free_page(sg_page(sg));
3361
3362         kfree(sgl);
3363 }
3364
3365 static inline void transport_free_pages(struct se_cmd *cmd)
3366 {
3367         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3368                 return;
3369
3370         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3371         cmd->t_data_sg = NULL;
3372         cmd->t_data_nents = 0;
3373
3374         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3375         cmd->t_bidi_data_sg = NULL;
3376         cmd->t_bidi_data_nents = 0;
3377 }
3378
3379 /**
3380  * transport_release_cmd - free a command
3381  * @cmd:       command to free
3382  *
3383  * This routine unconditionally frees a command, and reference counting
3384  * or list removal must be done in the caller.
3385  */
3386 static void transport_release_cmd(struct se_cmd *cmd)
3387 {
3388         BUG_ON(!cmd->se_tfo);
3389
3390         if (cmd->se_tmr_req)
3391                 core_tmr_release_req(cmd->se_tmr_req);
3392         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3393                 kfree(cmd->t_task_cdb);
3394         /*
3395          * If this cmd has been setup with target_get_sess_cmd(), drop
3396          * the kref and call ->release_cmd() in kref callback.
3397          */
3398          if (cmd->check_release != 0) {
3399                 target_put_sess_cmd(cmd->se_sess, cmd);
3400                 return;
3401         }
3402         cmd->se_tfo->release_cmd(cmd);
3403 }
3404
3405 /**
3406  * transport_put_cmd - release a reference to a command
3407  * @cmd:       command to release
3408  *
3409  * This routine releases our reference to the command and frees it if possible.
3410  */
3411 static void transport_put_cmd(struct se_cmd *cmd)
3412 {
3413         unsigned long flags;
3414         int free_tasks = 0;
3415
3416         spin_lock_irqsave(&cmd->t_state_lock, flags);
3417         if (atomic_read(&cmd->t_fe_count)) {
3418                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3419                         goto out_busy;
3420         }
3421
3422         if (atomic_read(&cmd->t_se_count)) {
3423                 if (!atomic_dec_and_test(&cmd->t_se_count))
3424                         goto out_busy;
3425         }
3426
3427         if (atomic_read(&cmd->transport_dev_active)) {
3428                 atomic_set(&cmd->transport_dev_active, 0);
3429                 transport_all_task_dev_remove_state(cmd);
3430                 free_tasks = 1;
3431         }
3432         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3433
3434         if (free_tasks != 0)
3435                 transport_free_dev_tasks(cmd);
3436
3437         transport_free_pages(cmd);
3438         transport_release_cmd(cmd);
3439         return;
3440 out_busy:
3441         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3442 }
3443
3444 /*
3445  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3446  * allocating in the core.
3447  * @cmd:  Associated se_cmd descriptor
3448  * @mem:  SGL style memory for TCM WRITE / READ
3449  * @sg_mem_num: Number of SGL elements
3450  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3451  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3452  *
3453  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3454  * of parameters.
3455  */
3456 int transport_generic_map_mem_to_cmd(
3457         struct se_cmd *cmd,
3458         struct scatterlist *sgl,
3459         u32 sgl_count,
3460         struct scatterlist *sgl_bidi,
3461         u32 sgl_bidi_count)
3462 {
3463         if (!sgl || !sgl_count)
3464                 return 0;
3465
3466         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3467             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3468                 /*
3469                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3470                  * scatterlists already have been set to follow what the fabric
3471                  * passes for the original expected data transfer length.
3472                  */
3473                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3474                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3475                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3476                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3477                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3478                         return -EINVAL;
3479                 }
3480
3481                 cmd->t_data_sg = sgl;
3482                 cmd->t_data_nents = sgl_count;
3483
3484                 if (sgl_bidi && sgl_bidi_count) {
3485                         cmd->t_bidi_data_sg = sgl_bidi;
3486                         cmd->t_bidi_data_nents = sgl_bidi_count;
3487                 }
3488                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3489         }
3490
3491         return 0;
3492 }
3493 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3494
3495 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3496 {
3497         struct scatterlist *sg = cmd->t_data_sg;
3498
3499         BUG_ON(!sg);
3500         /*
3501          * We need to take into account a possible offset here for fabrics like
3502          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3503          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3504          */
3505         return kmap(sg_page(sg)) + sg->offset;
3506 }
3507 EXPORT_SYMBOL(transport_kmap_first_data_page);
3508
3509 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3510 {
3511         kunmap(sg_page(cmd->t_data_sg));
3512 }
3513 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3514
3515 static int
3516 transport_generic_get_mem(struct se_cmd *cmd)
3517 {
3518         u32 length = cmd->data_length;
3519         unsigned int nents;
3520         struct page *page;
3521         gfp_t zero_flag;
3522         int i = 0;
3523
3524         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3525         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3526         if (!cmd->t_data_sg)
3527                 return -ENOMEM;
3528
3529         cmd->t_data_nents = nents;
3530         sg_init_table(cmd->t_data_sg, nents);
3531
3532         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3533
3534         while (length) {
3535                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3536                 page = alloc_page(GFP_KERNEL | zero_flag);
3537                 if (!page)
3538                         goto out;
3539
3540                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3541                 length -= page_len;
3542                 i++;
3543         }
3544         return 0;
3545
3546 out:
3547         while (i >= 0) {
3548                 __free_page(sg_page(&cmd->t_data_sg[i]));
3549                 i--;
3550         }
3551         kfree(cmd->t_data_sg);
3552         cmd->t_data_sg = NULL;
3553         return -ENOMEM;
3554 }
3555
3556 /* Reduce sectors if they are too long for the device */
3557 static inline sector_t transport_limit_task_sectors(
3558         struct se_device *dev,
3559         unsigned long long lba,
3560         sector_t sectors)
3561 {
3562         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3563
3564         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3565                 if ((lba + sectors) > transport_dev_end_lba(dev))
3566                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3567
3568         return sectors;
3569 }
3570
3571
3572 /*
3573  * This function can be used by HW target mode drivers to create a linked
3574  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3575  * This is intended to be called during the completion path by TCM Core
3576  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3577  */
3578 void transport_do_task_sg_chain(struct se_cmd *cmd)
3579 {
3580         struct scatterlist *sg_first = NULL;
3581         struct scatterlist *sg_prev = NULL;
3582         int sg_prev_nents = 0;
3583         struct scatterlist *sg;
3584         struct se_task *task;
3585         u32 chained_nents = 0;
3586         int i;
3587
3588         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3589
3590         /*
3591          * Walk the struct se_task list and setup scatterlist chains
3592          * for each contiguously allocated struct se_task->task_sg[].
3593          */
3594         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3595                 if (!task->task_sg)
3596                         continue;
3597
3598                 if (!sg_first) {
3599                         sg_first = task->task_sg;
3600                         chained_nents = task->task_sg_nents;
3601                 } else {
3602                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3603                         chained_nents += task->task_sg_nents;
3604                 }
3605                 /*
3606                  * For the padded tasks, use the extra SGL vector allocated
3607                  * in transport_allocate_data_tasks() for the sg_prev_nents
3608                  * offset into sg_chain() above.
3609                  *
3610                  * We do not need the padding for the last task (or a single
3611                  * task), but in that case we will never use the sg_prev_nents
3612                  * value below which would be incorrect.
3613                  */
3614                 sg_prev_nents = (task->task_sg_nents + 1);
3615                 sg_prev = task->task_sg;
3616         }
3617         /*
3618          * Setup the starting pointer and total t_tasks_sg_linked_no including
3619          * padding SGs for linking and to mark the end.
3620          */
3621         cmd->t_tasks_sg_chained = sg_first;
3622         cmd->t_tasks_sg_chained_no = chained_nents;
3623
3624         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3625                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3626                 cmd->t_tasks_sg_chained_no);
3627
3628         for_each_sg(cmd->t_tasks_sg_chained, sg,
3629                         cmd->t_tasks_sg_chained_no, i) {
3630
3631                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3632                         i, sg, sg_page(sg), sg->length, sg->offset);
3633                 if (sg_is_chain(sg))
3634                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3635                 if (sg_is_last(sg))
3636                         pr_debug("SG: %p sg_is_last=1\n", sg);
3637         }
3638 }
3639 EXPORT_SYMBOL(transport_do_task_sg_chain);
3640
3641 /*
3642  * Break up cmd into chunks transport can handle
3643  */
3644 static int
3645 transport_allocate_data_tasks(struct se_cmd *cmd,
3646         enum dma_data_direction data_direction,
3647         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3648 {
3649         struct se_device *dev = cmd->se_dev;
3650         int task_count, i;
3651         unsigned long long lba;
3652         sector_t sectors, dev_max_sectors;
3653         u32 sector_size;
3654
3655         if (transport_cmd_get_valid_sectors(cmd) < 0)
3656                 return -EINVAL;
3657
3658         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3659         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3660
3661         WARN_ON(cmd->data_length % sector_size);
3662
3663         lba = cmd->t_task_lba;
3664         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3665         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3666
3667         /*
3668          * If we need just a single task reuse the SG list in the command
3669          * and avoid a lot of work.
3670          */
3671         if (task_count == 1) {
3672                 struct se_task *task;
3673                 unsigned long flags;
3674
3675                 task = transport_generic_get_task(cmd, data_direction);
3676                 if (!task)
3677                         return -ENOMEM;
3678
3679                 task->task_sg = cmd_sg;
3680                 task->task_sg_nents = sgl_nents;
3681
3682                 task->task_lba = lba;
3683                 task->task_sectors = sectors;
3684                 task->task_size = task->task_sectors * sector_size;
3685
3686                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3687                 list_add_tail(&task->t_list, &cmd->t_task_list);
3688                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3689
3690                 return task_count;
3691         }
3692
3693         for (i = 0; i < task_count; i++) {
3694                 struct se_task *task;
3695                 unsigned int task_size, task_sg_nents_padded;
3696                 struct scatterlist *sg;
3697                 unsigned long flags;
3698                 int count;
3699
3700                 task = transport_generic_get_task(cmd, data_direction);
3701                 if (!task)
3702                         return -ENOMEM;
3703
3704                 task->task_lba = lba;
3705                 task->task_sectors = min(sectors, dev_max_sectors);
3706                 task->task_size = task->task_sectors * sector_size;
3707
3708                 /*
3709                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3710                  * in order to calculate the number per task SGL entries
3711                  */
3712                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3713                 /*
3714                  * Check if the fabric module driver is requesting that all
3715                  * struct se_task->task_sg[] be chained together..  If so,
3716                  * then allocate an extra padding SG entry for linking and
3717                  * marking the end of the chained SGL for every task except
3718                  * the last one for (task_count > 1) operation, or skipping
3719                  * the extra padding for the (task_count == 1) case.
3720                  */
3721                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3722                         task_sg_nents_padded = (task->task_sg_nents + 1);
3723                 } else
3724                         task_sg_nents_padded = task->task_sg_nents;
3725
3726                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3727                                         task_sg_nents_padded, GFP_KERNEL);
3728                 if (!task->task_sg) {
3729                         cmd->se_dev->transport->free_task(task);
3730                         return -ENOMEM;
3731                 }
3732
3733                 sg_init_table(task->task_sg, task_sg_nents_padded);
3734
3735                 task_size = task->task_size;
3736
3737                 /* Build new sgl, only up to task_size */
3738                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3739                         if (cmd_sg->length > task_size)
3740                                 break;
3741
3742                         *sg = *cmd_sg;
3743                         task_size -= cmd_sg->length;
3744                         cmd_sg = sg_next(cmd_sg);
3745                 }
3746
3747                 lba += task->task_sectors;
3748                 sectors -= task->task_sectors;
3749
3750                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3751                 list_add_tail(&task->t_list, &cmd->t_task_list);
3752                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3753         }
3754
3755         return task_count;
3756 }
3757
3758 static int
3759 transport_allocate_control_task(struct se_cmd *cmd)
3760 {
3761         struct se_task *task;
3762         unsigned long flags;
3763
3764         /* Workaround for handling zero-length control CDBs */
3765         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3766             !cmd->data_length)
3767                 return 0;
3768
3769         task = transport_generic_get_task(cmd, cmd->data_direction);
3770         if (!task)
3771                 return -ENOMEM;
3772
3773         task->task_sg = cmd->t_data_sg;
3774         task->task_size = cmd->data_length;
3775         task->task_sg_nents = cmd->t_data_nents;
3776
3777         spin_lock_irqsave(&cmd->t_state_lock, flags);
3778         list_add_tail(&task->t_list, &cmd->t_task_list);
3779         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3780
3781         /* Success! Return number of tasks allocated */
3782         return 1;
3783 }
3784
3785 /*
3786  * Allocate any required ressources to execute the command, and either place
3787  * it on the execution queue if possible.  For writes we might not have the
3788  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3789  */
3790 int transport_generic_new_cmd(struct se_cmd *cmd)
3791 {
3792         struct se_device *dev = cmd->se_dev;
3793         int task_cdbs, task_cdbs_bidi = 0;
3794         int set_counts = 1;
3795         int ret = 0;
3796
3797         /*
3798          * Determine is the TCM fabric module has already allocated physical
3799          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3800          * beforehand.
3801          */
3802         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3803             cmd->data_length) {
3804                 ret = transport_generic_get_mem(cmd);
3805                 if (ret < 0)
3806                         goto out_fail;
3807         }
3808
3809         /*
3810          * For BIDI command set up the read tasks first.
3811          */
3812         if (cmd->t_bidi_data_sg &&
3813             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3814                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3815
3816                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3817                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3818                                 cmd->t_bidi_data_nents);
3819                 if (task_cdbs_bidi <= 0)
3820                         goto out_fail;
3821
3822                 atomic_inc(&cmd->t_fe_count);
3823                 atomic_inc(&cmd->t_se_count);
3824                 set_counts = 0;
3825         }
3826
3827         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3828                 task_cdbs = transport_allocate_data_tasks(cmd,
3829                                         cmd->data_direction, cmd->t_data_sg,
3830                                         cmd->t_data_nents);
3831         } else {
3832                 task_cdbs = transport_allocate_control_task(cmd);
3833         }
3834
3835         if (task_cdbs < 0)
3836                 goto out_fail;
3837         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3838                 cmd->t_state = TRANSPORT_COMPLETE;
3839                 atomic_set(&cmd->t_transport_active, 1);
3840
3841                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3842                         u8 ua_asc = 0, ua_ascq = 0;
3843
3844                         core_scsi3_ua_clear_for_request_sense(cmd,
3845                                         &ua_asc, &ua_ascq);
3846                 }
3847
3848                 INIT_WORK(&cmd->work, target_complete_ok_work);
3849                 queue_work(target_completion_wq, &cmd->work);
3850                 return 0;
3851         }
3852
3853         if (set_counts) {
3854                 atomic_inc(&cmd->t_fe_count);
3855                 atomic_inc(&cmd->t_se_count);
3856         }
3857
3858         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3859         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3860         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3861
3862         /*
3863          * For WRITEs, let the fabric know its buffer is ready..
3864          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3865          * will be added to the struct se_device execution queue after its WRITE
3866          * data has arrived. (ie: It gets handled by the transport processing
3867          * thread a second time)
3868          */
3869         if (cmd->data_direction == DMA_TO_DEVICE) {
3870                 transport_add_tasks_to_state_queue(cmd);
3871                 return transport_generic_write_pending(cmd);
3872         }
3873         /*
3874          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3875          * to the execution queue.
3876          */
3877         transport_execute_tasks(cmd);
3878         return 0;
3879
3880 out_fail:
3881         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3882         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3883         return -EINVAL;
3884 }
3885 EXPORT_SYMBOL(transport_generic_new_cmd);
3886
3887 /*      transport_generic_process_write():
3888  *
3889  *
3890  */
3891 void transport_generic_process_write(struct se_cmd *cmd)
3892 {
3893         transport_execute_tasks(cmd);
3894 }
3895 EXPORT_SYMBOL(transport_generic_process_write);
3896
3897 static void transport_write_pending_qf(struct se_cmd *cmd)
3898 {
3899         int ret;
3900
3901         ret = cmd->se_tfo->write_pending(cmd);
3902         if (ret == -EAGAIN || ret == -ENOMEM) {
3903                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3904                          cmd);
3905                 transport_handle_queue_full(cmd, cmd->se_dev);
3906         }
3907 }
3908
3909 static int transport_generic_write_pending(struct se_cmd *cmd)
3910 {
3911         unsigned long flags;
3912         int ret;
3913
3914         spin_lock_irqsave(&cmd->t_state_lock, flags);
3915         cmd->t_state = TRANSPORT_WRITE_PENDING;
3916         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3917
3918         /*
3919          * Clear the se_cmd for WRITE_PENDING status in order to set
3920          * cmd->t_transport_active=0 so that transport_generic_handle_data
3921          * can be called from HW target mode interrupt code.  This is safe
3922          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3923          * because the se_cmd->se_lun pointer is not being cleared.
3924          */
3925         transport_cmd_check_stop(cmd, 1, 0);
3926
3927         /*
3928          * Call the fabric write_pending function here to let the
3929          * frontend know that WRITE buffers are ready.
3930          */
3931         ret = cmd->se_tfo->write_pending(cmd);
3932         if (ret == -EAGAIN || ret == -ENOMEM)
3933                 goto queue_full;
3934         else if (ret < 0)
3935                 return ret;
3936
3937         return 1;
3938
3939 queue_full:
3940         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3941         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3942         transport_handle_queue_full(cmd, cmd->se_dev);
3943         return 0;
3944 }
3945
3946 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3947 {
3948         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3949                 if (wait_for_tasks && cmd->se_tmr_req)
3950                          transport_wait_for_tasks(cmd);
3951
3952                 transport_release_cmd(cmd);
3953         } else {
3954                 if (wait_for_tasks)
3955                         transport_wait_for_tasks(cmd);
3956
3957                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3958
3959                 if (cmd->se_lun)
3960                         transport_lun_remove_cmd(cmd);
3961
3962                 transport_free_dev_tasks(cmd);
3963
3964                 transport_put_cmd(cmd);
3965         }
3966 }
3967 EXPORT_SYMBOL(transport_generic_free_cmd);
3968
3969 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3970  * @se_sess:    session to reference
3971  * @se_cmd:     command descriptor to add
3972  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3973  */
3974 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3975                         bool ack_kref)
3976 {
3977         unsigned long flags;
3978
3979         kref_init(&se_cmd->cmd_kref);
3980         /*
3981          * Add a second kref if the fabric caller is expecting to handle
3982          * fabric acknowledgement that requires two target_put_sess_cmd()
3983          * invocations before se_cmd descriptor release.
3984          */
3985         if (ack_kref == true)
3986                 kref_get(&se_cmd->cmd_kref);
3987
3988         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3989         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3990         se_cmd->check_release = 1;
3991         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3992 }
3993 EXPORT_SYMBOL(target_get_sess_cmd);
3994
3995 static void target_release_cmd_kref(struct kref *kref)
3996 {
3997         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3998         struct se_session *se_sess = se_cmd->se_sess;
3999         unsigned long flags;
4000
4001         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4002         if (list_empty(&se_cmd->se_cmd_list)) {
4003                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4004                 WARN_ON(1);
4005                 return;
4006         }
4007         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
4008                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4009                 complete(&se_cmd->cmd_wait_comp);
4010                 return;
4011         }
4012         list_del(&se_cmd->se_cmd_list);
4013         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4014
4015         se_cmd->se_tfo->release_cmd(se_cmd);
4016 }
4017
4018 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
4019  * @se_sess:    session to reference
4020  * @se_cmd:     command descriptor to drop
4021  */
4022 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
4023 {
4024         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
4025 }
4026 EXPORT_SYMBOL(target_put_sess_cmd);
4027
4028 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4029  * @se_sess:    session to split
4030  */
4031 void target_splice_sess_cmd_list(struct se_session *se_sess)
4032 {
4033         struct se_cmd *se_cmd;
4034         unsigned long flags;
4035
4036         WARN_ON(!list_empty(&se_sess->sess_wait_list));
4037         INIT_LIST_HEAD(&se_sess->sess_wait_list);
4038
4039         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4040         se_sess->sess_tearing_down = 1;
4041
4042         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4043
4044         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4045                 se_cmd->cmd_wait_set = 1;
4046
4047         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4048 }
4049 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4050
4051 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4052  * @se_sess:    session to wait for active I/O
4053  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
4054  */
4055 void target_wait_for_sess_cmds(
4056         struct se_session *se_sess,
4057         int wait_for_tasks)
4058 {
4059         struct se_cmd *se_cmd, *tmp_cmd;
4060         bool rc = false;
4061
4062         list_for_each_entry_safe(se_cmd, tmp_cmd,
4063                                 &se_sess->sess_wait_list, se_cmd_list) {
4064                 list_del(&se_cmd->se_cmd_list);
4065
4066                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4067                         " %d\n", se_cmd, se_cmd->t_state,
4068                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4069
4070                 if (wait_for_tasks) {
4071                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4072                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4073                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4074
4075                         rc = transport_wait_for_tasks(se_cmd);
4076
4077                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4078                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4079                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4080                 }
4081
4082                 if (!rc) {
4083                         wait_for_completion(&se_cmd->cmd_wait_comp);
4084                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4085                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4086                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4087                 }
4088
4089                 se_cmd->se_tfo->release_cmd(se_cmd);
4090         }
4091 }
4092 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4093
4094 /*      transport_lun_wait_for_tasks():
4095  *
4096  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4097  *      an struct se_lun to be successfully shutdown.
4098  */
4099 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4100 {
4101         unsigned long flags;
4102         int ret;
4103         /*
4104          * If the frontend has already requested this struct se_cmd to
4105          * be stopped, we can safely ignore this struct se_cmd.
4106          */
4107         spin_lock_irqsave(&cmd->t_state_lock, flags);
4108         if (atomic_read(&cmd->t_transport_stop)) {
4109                 atomic_set(&cmd->transport_lun_stop, 0);
4110                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4111                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4112                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4113                 transport_cmd_check_stop(cmd, 1, 0);
4114                 return -EPERM;
4115         }
4116         atomic_set(&cmd->transport_lun_fe_stop, 1);
4117         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4118
4119         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4120
4121         ret = transport_stop_tasks_for_cmd(cmd);
4122
4123         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4124                         " %d\n", cmd, cmd->t_task_list_num, ret);
4125         if (!ret) {
4126                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4127                                 cmd->se_tfo->get_task_tag(cmd));
4128                 wait_for_completion(&cmd->transport_lun_stop_comp);
4129                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4130                                 cmd->se_tfo->get_task_tag(cmd));
4131         }
4132         transport_remove_cmd_from_queue(cmd);
4133
4134         return 0;
4135 }
4136
4137 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4138 {
4139         struct se_cmd *cmd = NULL;
4140         unsigned long lun_flags, cmd_flags;
4141         /*
4142          * Do exception processing and return CHECK_CONDITION status to the
4143          * Initiator Port.
4144          */
4145         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4146         while (!list_empty(&lun->lun_cmd_list)) {
4147                 cmd = list_first_entry(&lun->lun_cmd_list,
4148                        struct se_cmd, se_lun_node);
4149                 list_del(&cmd->se_lun_node);
4150
4151                 atomic_set(&cmd->transport_lun_active, 0);
4152                 /*
4153                  * This will notify iscsi_target_transport.c:
4154                  * transport_cmd_check_stop() that a LUN shutdown is in
4155                  * progress for the iscsi_cmd_t.
4156                  */
4157                 spin_lock(&cmd->t_state_lock);
4158                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4159                         "_lun_stop for  ITT: 0x%08x\n",
4160                         cmd->se_lun->unpacked_lun,
4161                         cmd->se_tfo->get_task_tag(cmd));
4162                 atomic_set(&cmd->transport_lun_stop, 1);
4163                 spin_unlock(&cmd->t_state_lock);
4164
4165                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4166
4167                 if (!cmd->se_lun) {
4168                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4169                                 cmd->se_tfo->get_task_tag(cmd),
4170                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4171                         BUG();
4172                 }
4173                 /*
4174                  * If the Storage engine still owns the iscsi_cmd_t, determine
4175                  * and/or stop its context.
4176                  */
4177                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4178                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4179                         cmd->se_tfo->get_task_tag(cmd));
4180
4181                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4182                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4183                         continue;
4184                 }
4185
4186                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4187                         "_wait_for_tasks(): SUCCESS\n",
4188                         cmd->se_lun->unpacked_lun,
4189                         cmd->se_tfo->get_task_tag(cmd));
4190
4191                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4192                 if (!atomic_read(&cmd->transport_dev_active)) {
4193                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4194                         goto check_cond;
4195                 }
4196                 atomic_set(&cmd->transport_dev_active, 0);
4197                 transport_all_task_dev_remove_state(cmd);
4198                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4199
4200                 transport_free_dev_tasks(cmd);
4201                 /*
4202                  * The Storage engine stopped this struct se_cmd before it was
4203                  * send to the fabric frontend for delivery back to the
4204                  * Initiator Node.  Return this SCSI CDB back with an
4205                  * CHECK_CONDITION status.
4206                  */
4207 check_cond:
4208                 transport_send_check_condition_and_sense(cmd,
4209                                 TCM_NON_EXISTENT_LUN, 0);
4210                 /*
4211                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4212                  * be released, notify the waiting thread now that LU has
4213                  * finished accessing it.
4214                  */
4215                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4216                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4217                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4218                                 " struct se_cmd: %p ITT: 0x%08x\n",
4219                                 lun->unpacked_lun,
4220                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4221
4222                         spin_unlock_irqrestore(&cmd->t_state_lock,
4223                                         cmd_flags);
4224                         transport_cmd_check_stop(cmd, 1, 0);
4225                         complete(&cmd->transport_lun_fe_stop_comp);
4226                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4227                         continue;
4228                 }
4229                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4230                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4231
4232                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4233                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4234         }
4235         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4236 }
4237
4238 static int transport_clear_lun_thread(void *p)
4239 {
4240         struct se_lun *lun = p;
4241
4242         __transport_clear_lun_from_sessions(lun);
4243         complete(&lun->lun_shutdown_comp);
4244
4245         return 0;
4246 }
4247
4248 int transport_clear_lun_from_sessions(struct se_lun *lun)
4249 {
4250         struct task_struct *kt;
4251
4252         kt = kthread_run(transport_clear_lun_thread, lun,
4253                         "tcm_cl_%u", lun->unpacked_lun);
4254         if (IS_ERR(kt)) {
4255                 pr_err("Unable to start clear_lun thread\n");
4256                 return PTR_ERR(kt);
4257         }
4258         wait_for_completion(&lun->lun_shutdown_comp);
4259
4260         return 0;
4261 }
4262
4263 /**
4264  * transport_wait_for_tasks - wait for completion to occur
4265  * @cmd:        command to wait
4266  *
4267  * Called from frontend fabric context to wait for storage engine
4268  * to pause and/or release frontend generated struct se_cmd.
4269  */
4270 bool transport_wait_for_tasks(struct se_cmd *cmd)
4271 {
4272         unsigned long flags;
4273
4274         spin_lock_irqsave(&cmd->t_state_lock, flags);
4275         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4276                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4277                 return false;
4278         }
4279         /*
4280          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4281          * has been set in transport_set_supported_SAM_opcode().
4282          */
4283         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4284                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4285                 return false;
4286         }
4287         /*
4288          * If we are already stopped due to an external event (ie: LUN shutdown)
4289          * sleep until the connection can have the passed struct se_cmd back.
4290          * The cmd->transport_lun_stopped_sem will be upped by
4291          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4292          * has completed its operation on the struct se_cmd.
4293          */
4294         if (atomic_read(&cmd->transport_lun_stop)) {
4295
4296                 pr_debug("wait_for_tasks: Stopping"
4297                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4298                         "_stop_comp); for ITT: 0x%08x\n",
4299                         cmd->se_tfo->get_task_tag(cmd));
4300                 /*
4301                  * There is a special case for WRITES where a FE exception +
4302                  * LUN shutdown means ConfigFS context is still sleeping on
4303                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4304                  * We go ahead and up transport_lun_stop_comp just to be sure
4305                  * here.
4306                  */
4307                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4308                 complete(&cmd->transport_lun_stop_comp);
4309                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4310                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4311
4312                 transport_all_task_dev_remove_state(cmd);
4313                 /*
4314                  * At this point, the frontend who was the originator of this
4315                  * struct se_cmd, now owns the structure and can be released through
4316                  * normal means below.
4317                  */
4318                 pr_debug("wait_for_tasks: Stopped"
4319                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4320                         "stop_comp); for ITT: 0x%08x\n",
4321                         cmd->se_tfo->get_task_tag(cmd));
4322
4323                 atomic_set(&cmd->transport_lun_stop, 0);
4324         }
4325         if (!atomic_read(&cmd->t_transport_active) ||
4326              atomic_read(&cmd->t_transport_aborted)) {
4327                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4328                 return false;
4329         }
4330
4331         atomic_set(&cmd->t_transport_stop, 1);
4332
4333         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4334                 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4335                 cmd, cmd->se_tfo->get_task_tag(cmd),
4336                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4337
4338         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4339
4340         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4341
4342         wait_for_completion(&cmd->t_transport_stop_comp);
4343
4344         spin_lock_irqsave(&cmd->t_state_lock, flags);
4345         atomic_set(&cmd->t_transport_active, 0);
4346         atomic_set(&cmd->t_transport_stop, 0);
4347
4348         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4349                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4350                 cmd->se_tfo->get_task_tag(cmd));
4351
4352         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4353
4354         return true;
4355 }
4356 EXPORT_SYMBOL(transport_wait_for_tasks);
4357
4358 static int transport_get_sense_codes(
4359         struct se_cmd *cmd,
4360         u8 *asc,
4361         u8 *ascq)
4362 {
4363         *asc = cmd->scsi_asc;
4364         *ascq = cmd->scsi_ascq;
4365
4366         return 0;
4367 }
4368
4369 static int transport_set_sense_codes(
4370         struct se_cmd *cmd,
4371         u8 asc,
4372         u8 ascq)
4373 {
4374         cmd->scsi_asc = asc;
4375         cmd->scsi_ascq = ascq;
4376
4377         return 0;
4378 }
4379
4380 int transport_send_check_condition_and_sense(
4381         struct se_cmd *cmd,
4382         u8 reason,
4383         int from_transport)
4384 {
4385         unsigned char *buffer = cmd->sense_buffer;
4386         unsigned long flags;
4387         int offset;
4388         u8 asc = 0, ascq = 0;
4389
4390         spin_lock_irqsave(&cmd->t_state_lock, flags);
4391         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4392                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4393                 return 0;
4394         }
4395         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4396         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4397
4398         if (!reason && from_transport)
4399                 goto after_reason;
4400
4401         if (!from_transport)
4402                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4403         /*
4404          * Data Segment and SenseLength of the fabric response PDU.
4405          *
4406          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4407          * from include/scsi/scsi_cmnd.h
4408          */
4409         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4410                                 TRANSPORT_SENSE_BUFFER);
4411         /*
4412          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4413          * SENSE KEY values from include/scsi/scsi.h
4414          */
4415         switch (reason) {
4416         case TCM_NON_EXISTENT_LUN:
4417                 /* CURRENT ERROR */
4418                 buffer[offset] = 0x70;
4419                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4420                 /* ILLEGAL REQUEST */
4421                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4422                 /* LOGICAL UNIT NOT SUPPORTED */
4423                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4424                 break;
4425         case TCM_UNSUPPORTED_SCSI_OPCODE:
4426         case TCM_SECTOR_COUNT_TOO_MANY:
4427                 /* CURRENT ERROR */
4428                 buffer[offset] = 0x70;
4429                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4430                 /* ILLEGAL REQUEST */
4431                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4432                 /* INVALID COMMAND OPERATION CODE */
4433                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4434                 break;
4435         case TCM_UNKNOWN_MODE_PAGE:
4436                 /* CURRENT ERROR */
4437                 buffer[offset] = 0x70;
4438                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4439                 /* ILLEGAL REQUEST */
4440                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4441                 /* INVALID FIELD IN CDB */
4442                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4443                 break;
4444         case TCM_CHECK_CONDITION_ABORT_CMD:
4445                 /* CURRENT ERROR */
4446                 buffer[offset] = 0x70;
4447                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4448                 /* ABORTED COMMAND */
4449                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4450                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4451                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4452                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4453                 break;
4454         case TCM_INCORRECT_AMOUNT_OF_DATA:
4455                 /* CURRENT ERROR */
4456                 buffer[offset] = 0x70;
4457                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4458                 /* ABORTED COMMAND */
4459                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4460                 /* WRITE ERROR */
4461                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4462                 /* NOT ENOUGH UNSOLICITED DATA */
4463                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4464                 break;
4465         case TCM_INVALID_CDB_FIELD:
4466                 /* CURRENT ERROR */
4467                 buffer[offset] = 0x70;
4468                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4469                 /* ILLEGAL REQUEST */
4470                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4471                 /* INVALID FIELD IN CDB */
4472                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4473                 break;
4474         case TCM_INVALID_PARAMETER_LIST:
4475                 /* CURRENT ERROR */
4476                 buffer[offset] = 0x70;
4477                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4478                 /* ILLEGAL REQUEST */
4479                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4480                 /* INVALID FIELD IN PARAMETER LIST */
4481                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4482                 break;
4483         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4484                 /* CURRENT ERROR */
4485                 buffer[offset] = 0x70;
4486                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4487                 /* ABORTED COMMAND */
4488                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4489                 /* WRITE ERROR */
4490                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4491                 /* UNEXPECTED_UNSOLICITED_DATA */
4492                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4493                 break;
4494         case TCM_SERVICE_CRC_ERROR:
4495                 /* CURRENT ERROR */
4496                 buffer[offset] = 0x70;
4497                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4498                 /* ABORTED COMMAND */
4499                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4500                 /* PROTOCOL SERVICE CRC ERROR */
4501                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4502                 /* N/A */
4503                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4504                 break;
4505         case TCM_SNACK_REJECTED:
4506                 /* CURRENT ERROR */
4507                 buffer[offset] = 0x70;
4508                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4509                 /* ABORTED COMMAND */
4510                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4511                 /* READ ERROR */
4512                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4513                 /* FAILED RETRANSMISSION REQUEST */
4514                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4515                 break;
4516         case TCM_WRITE_PROTECTED:
4517                 /* CURRENT ERROR */
4518                 buffer[offset] = 0x70;
4519                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4520                 /* DATA PROTECT */
4521                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4522                 /* WRITE PROTECTED */
4523                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4524                 break;
4525         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4526                 /* CURRENT ERROR */
4527                 buffer[offset] = 0x70;
4528                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4529                 /* UNIT ATTENTION */
4530                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4531                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4532                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4533                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4534                 break;
4535         case TCM_CHECK_CONDITION_NOT_READY:
4536                 /* CURRENT ERROR */
4537                 buffer[offset] = 0x70;
4538                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4539                 /* Not Ready */
4540                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4541                 transport_get_sense_codes(cmd, &asc, &ascq);
4542                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4543                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4544                 break;
4545         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4546         default:
4547                 /* CURRENT ERROR */
4548                 buffer[offset] = 0x70;
4549                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4550                 /* ILLEGAL REQUEST */
4551                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4552                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4553                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4554                 break;
4555         }
4556         /*
4557          * This code uses linux/include/scsi/scsi.h SAM status codes!
4558          */
4559         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4560         /*
4561          * Automatically padded, this value is encoded in the fabric's
4562          * data_length response PDU containing the SCSI defined sense data.
4563          */
4564         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4565
4566 after_reason:
4567         return cmd->se_tfo->queue_status(cmd);
4568 }
4569 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4570
4571 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4572 {
4573         int ret = 0;
4574
4575         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4576                 if (!send_status ||
4577                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4578                         return 1;
4579 #if 0
4580                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4581                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4582                         cmd->t_task_cdb[0],
4583                         cmd->se_tfo->get_task_tag(cmd));
4584 #endif
4585                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4586                 cmd->se_tfo->queue_status(cmd);
4587                 ret = 1;
4588         }
4589         return ret;
4590 }
4591 EXPORT_SYMBOL(transport_check_aborted_status);
4592
4593 void transport_send_task_abort(struct se_cmd *cmd)
4594 {
4595         unsigned long flags;
4596
4597         spin_lock_irqsave(&cmd->t_state_lock, flags);
4598         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4599                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4600                 return;
4601         }
4602         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4603
4604         /*
4605          * If there are still expected incoming fabric WRITEs, we wait
4606          * until until they have completed before sending a TASK_ABORTED
4607          * response.  This response with TASK_ABORTED status will be
4608          * queued back to fabric module by transport_check_aborted_status().
4609          */
4610         if (cmd->data_direction == DMA_TO_DEVICE) {
4611                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4612                         atomic_inc(&cmd->t_transport_aborted);
4613                         smp_mb__after_atomic_inc();
4614                 }
4615         }
4616         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4617 #if 0
4618         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4619                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4620                 cmd->se_tfo->get_task_tag(cmd));
4621 #endif
4622         cmd->se_tfo->queue_status(cmd);
4623 }
4624
4625 static int transport_generic_do_tmr(struct se_cmd *cmd)
4626 {
4627         struct se_device *dev = cmd->se_dev;
4628         struct se_tmr_req *tmr = cmd->se_tmr_req;
4629         int ret;
4630
4631         switch (tmr->function) {
4632         case TMR_ABORT_TASK:
4633                 tmr->response = TMR_FUNCTION_REJECTED;
4634                 break;
4635         case TMR_ABORT_TASK_SET:
4636         case TMR_CLEAR_ACA:
4637         case TMR_CLEAR_TASK_SET:
4638                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4639                 break;
4640         case TMR_LUN_RESET:
4641                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4642                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4643                                          TMR_FUNCTION_REJECTED;
4644                 break;
4645         case TMR_TARGET_WARM_RESET:
4646                 tmr->response = TMR_FUNCTION_REJECTED;
4647                 break;
4648         case TMR_TARGET_COLD_RESET:
4649                 tmr->response = TMR_FUNCTION_REJECTED;
4650                 break;
4651         default:
4652                 pr_err("Uknown TMR function: 0x%02x.\n",
4653                                 tmr->function);
4654                 tmr->response = TMR_FUNCTION_REJECTED;
4655                 break;
4656         }
4657
4658         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4659         cmd->se_tfo->queue_tm_rsp(cmd);
4660
4661         transport_cmd_check_stop_to_fabric(cmd);
4662         return 0;
4663 }
4664
4665 /*      transport_processing_thread():
4666  *
4667  *
4668  */
4669 static int transport_processing_thread(void *param)
4670 {
4671         int ret;
4672         struct se_cmd *cmd;
4673         struct se_device *dev = param;
4674
4675         while (!kthread_should_stop()) {
4676                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4677                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4678                                 kthread_should_stop());
4679                 if (ret < 0)
4680                         goto out;
4681
4682 get_cmd:
4683                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4684                 if (!cmd)
4685                         continue;
4686
4687                 switch (cmd->t_state) {
4688                 case TRANSPORT_NEW_CMD:
4689                         BUG();
4690                         break;
4691                 case TRANSPORT_NEW_CMD_MAP:
4692                         if (!cmd->se_tfo->new_cmd_map) {
4693                                 pr_err("cmd->se_tfo->new_cmd_map is"
4694                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4695                                 BUG();
4696                         }
4697                         ret = cmd->se_tfo->new_cmd_map(cmd);
4698                         if (ret < 0) {
4699                                 transport_generic_request_failure(cmd);
4700                                 break;
4701                         }
4702                         ret = transport_generic_new_cmd(cmd);
4703                         if (ret < 0) {
4704                                 transport_generic_request_failure(cmd);
4705                                 break;
4706                         }
4707                         break;
4708                 case TRANSPORT_PROCESS_WRITE:
4709                         transport_generic_process_write(cmd);
4710                         break;
4711                 case TRANSPORT_PROCESS_TMR:
4712                         transport_generic_do_tmr(cmd);
4713                         break;
4714                 case TRANSPORT_COMPLETE_QF_WP:
4715                         transport_write_pending_qf(cmd);
4716                         break;
4717                 case TRANSPORT_COMPLETE_QF_OK:
4718                         transport_complete_qf(cmd);
4719                         break;
4720                 default:
4721                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4722                                 "i_state: %d on SE LUN: %u\n",
4723                                 cmd->t_state,
4724                                 cmd->se_tfo->get_task_tag(cmd),
4725                                 cmd->se_tfo->get_cmd_state(cmd),
4726                                 cmd->se_lun->unpacked_lun);
4727                         BUG();
4728                 }
4729
4730                 goto get_cmd;
4731         }
4732
4733 out:
4734         WARN_ON(!list_empty(&dev->state_task_list));
4735         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4736         dev->process_thread = NULL;
4737         return 0;
4738 }