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_device.h>
  49 #include <target/target_core_tmr.h>
  50 #include <target/target_core_tpg.h>
  51 #include <target/target_core_transport.h>
  52 #include <target/target_core_fabric_ops.h>
  53 #include <target/target_core_configfs.h>
  54
  55 #include "target_core_alua.h"
  56 #include "target_core_cdb.h"
  57 #include "target_core_hba.h"
  58 #include "target_core_pr.h"
  59 #include "target_core_ua.h"
  60
  61 static int sub_api_initialized;
  62
  63 static struct workqueue_struct *target_completion_wq;
  64 static struct kmem_cache *se_sess_cache;
  65 struct kmem_cache *se_tmr_req_cache;
  66 struct kmem_cache *se_ua_cache;
  67 struct kmem_cache *t10_pr_reg_cache;
  68 struct kmem_cache *t10_alua_lu_gp_cache;
  69 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  70 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  71 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  72
  73 static int transport_generic_write_pending(struct se_cmd *);
  74 static int transport_processing_thread(void *param);
  75 static int __transport_execute_tasks(struct se_device *dev);
  76 static void transport_complete_task_attr(struct se_cmd *cmd);
  77 static void transport_handle_queue_full(struct se_cmd *cmd,
  78                 struct se_device *dev);
  79 static void transport_free_dev_tasks(struct se_cmd *cmd);
  80 static int transport_generic_get_mem(struct se_cmd *cmd);
  81 static void transport_put_cmd(struct se_cmd *cmd);
  82 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  83 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  84 static void transport_generic_request_failure(struct se_cmd *);
  85 static void target_complete_ok_work(struct work_struct *work);
  86
  87 int init_se_kmem_caches(void)
  88 {
  89         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
  90                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
  91                         0, NULL);
  92         if (!se_tmr_req_cache) {
  93                 pr_err("kmem_cache_create() for struct se_tmr_req"
  94                                 " failed\n");
  95                 goto out;
  96         }
  97         se_sess_cache = kmem_cache_create("se_sess_cache",
  98                         sizeof(struct se_session), __alignof__(struct se_session),
  99                         0, NULL);
 100         if (!se_sess_cache) {
 101                 pr_err("kmem_cache_create() for struct se_session"
 102                                 " failed\n");
 103                 goto out_free_tmr_req_cache;
 104         }
 105         se_ua_cache = kmem_cache_create("se_ua_cache",
 106                         sizeof(struct se_ua), __alignof__(struct se_ua),
 107                         0, NULL);
 108         if (!se_ua_cache) {
 109                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 110                 goto out_free_sess_cache;
 111         }
 112         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 113                         sizeof(struct t10_pr_registration),
 114                         __alignof__(struct t10_pr_registration), 0, NULL);
 115         if (!t10_pr_reg_cache) {
 116                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 117                                 " failed\n");
 118                 goto out_free_ua_cache;
 119         }
 120         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 121                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 122                         0, NULL);
 123         if (!t10_alua_lu_gp_cache) {
 124                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 125                                 " failed\n");
 126                 goto out_free_pr_reg_cache;
 127         }
 128         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 129                         sizeof(struct t10_alua_lu_gp_member),
 130                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 131         if (!t10_alua_lu_gp_mem_cache) {
 132                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 133                                 "cache failed\n");
 134                 goto out_free_lu_gp_cache;
 135         }
 136         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 137                         sizeof(struct t10_alua_tg_pt_gp),
 138                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 139         if (!t10_alua_tg_pt_gp_cache) {
 140                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 141                                 "cache failed\n");
 142                 goto out_free_lu_gp_mem_cache;
 143         }
 144         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 145                         "t10_alua_tg_pt_gp_mem_cache",
 146                         sizeof(struct t10_alua_tg_pt_gp_member),
 147                         __alignof__(struct t10_alua_tg_pt_gp_member),
 148                         0, NULL);
 149         if (!t10_alua_tg_pt_gp_mem_cache) {
 150                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 151                                 "mem_t failed\n");
 152                 goto out_free_tg_pt_gp_cache;
 153         }
 154
 155         target_completion_wq = alloc_workqueue("target_completion",
 156                                                WQ_MEM_RECLAIM, 0);
 157         if (!target_completion_wq)
 158                 goto out_free_tg_pt_gp_mem_cache;
 159
 160         return 0;
 161
 162 out_free_tg_pt_gp_mem_cache:
 163         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 164 out_free_tg_pt_gp_cache:
 165         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 166 out_free_lu_gp_mem_cache:
 167         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 168 out_free_lu_gp_cache:
 169         kmem_cache_destroy(t10_alua_lu_gp_cache);
 170 out_free_pr_reg_cache:
 171         kmem_cache_destroy(t10_pr_reg_cache);
 172 out_free_ua_cache:
 173         kmem_cache_destroy(se_ua_cache);
 174 out_free_sess_cache:
 175         kmem_cache_destroy(se_sess_cache);
 176 out_free_tmr_req_cache:
 177         kmem_cache_destroy(se_tmr_req_cache);
 178 out:
 179         return -ENOMEM;
 180 }
 181
 182 void release_se_kmem_caches(void)
 183 {
 184         destroy_workqueue(target_completion_wq);
 185         kmem_cache_destroy(se_tmr_req_cache);
 186         kmem_cache_destroy(se_sess_cache);
 187         kmem_cache_destroy(se_ua_cache);
 188         kmem_cache_destroy(t10_pr_reg_cache);
 189         kmem_cache_destroy(t10_alua_lu_gp_cache);
 190         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 191         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 192         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 193 }
 194
 195 /* This code ensures unique mib indexes are handed out. */
 196 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 197 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 198
 199 /*
 200  * Allocate a new row index for the entry type specified
 201  */
 202 u32 scsi_get_new_index(scsi_index_t type)
 203 {
 204         u32 new_index;
 205
 206         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 207
 208         spin_lock(&scsi_mib_index_lock);
 209         new_index = ++scsi_mib_index[type];
 210         spin_unlock(&scsi_mib_index_lock);
 211
 212         return new_index;
 213 }
 214
 215 void transport_init_queue_obj(struct se_queue_obj *qobj)
 216 {
 217         atomic_set(&qobj->queue_cnt, 0);
 218         INIT_LIST_HEAD(&qobj->qobj_list);
 219         init_waitqueue_head(&qobj->thread_wq);
 220         spin_lock_init(&qobj->cmd_queue_lock);
 221 }
 222 EXPORT_SYMBOL(transport_init_queue_obj);
 223
 224 void transport_subsystem_check_init(void)
 225 {
 226         int ret;
 227
 228         if (sub_api_initialized)
 229                 return;
 230
 231         ret = request_module("target_core_iblock");
 232         if (ret != 0)
 233                 pr_err("Unable to load target_core_iblock\n");
 234
 235         ret = request_module("target_core_file");
 236         if (ret != 0)
 237                 pr_err("Unable to load target_core_file\n");
 238
 239         ret = request_module("target_core_pscsi");
 240         if (ret != 0)
 241                 pr_err("Unable to load target_core_pscsi\n");
 242
 243         ret = request_module("target_core_stgt");
 244         if (ret != 0)
 245                 pr_err("Unable to load target_core_stgt\n");
 246
 247         sub_api_initialized = 1;
 248         return;
 249 }
 250
 251 struct se_session *transport_init_session(void)
 252 {
 253         struct se_session *se_sess;
 254
 255         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 256         if (!se_sess) {
 257                 pr_err("Unable to allocate struct se_session from"
 258                                 " se_sess_cache\n");
 259                 return ERR_PTR(-ENOMEM);
 260         }
 261         INIT_LIST_HEAD(&se_sess->sess_list);
 262         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 263         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 264         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 265         spin_lock_init(&se_sess->sess_cmd_lock);
 266
 267         return se_sess;
 268 }
 269 EXPORT_SYMBOL(transport_init_session);
 270
 271 /*
 272  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 273  */
 274 void __transport_register_session(
 275         struct se_portal_group *se_tpg,
 276         struct se_node_acl *se_nacl,
 277         struct se_session *se_sess,
 278         void *fabric_sess_ptr)
 279 {
 280         unsigned char buf[PR_REG_ISID_LEN];
 281
 282         se_sess->se_tpg = se_tpg;
 283         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 284         /*
 285          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 286          *
 287          * Only set for struct se_session's that will actually be moving I/O.
 288          * eg: *NOT* discovery sessions.
 289          */
 290         if (se_nacl) {
 291                 /*
 292                  * If the fabric module supports an ISID based TransportID,
 293                  * save this value in binary from the fabric I_T Nexus now.
 294                  */
 295                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 296                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 297                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 298                                         &buf[0], PR_REG_ISID_LEN);
 299                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 300                 }
 301                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 302                 /*
 303                  * The se_nacl->nacl_sess pointer will be set to the
 304                  * last active I_T Nexus for each struct se_node_acl.
 305                  */
 306                 se_nacl->nacl_sess = se_sess;
 307
 308                 list_add_tail(&se_sess->sess_acl_list,
 309                               &se_nacl->acl_sess_list);
 310                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 311         }
 312         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 313
 314         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 315                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 316 }
 317 EXPORT_SYMBOL(__transport_register_session);
 318
 319 void transport_register_session(
 320         struct se_portal_group *se_tpg,
 321         struct se_node_acl *se_nacl,
 322         struct se_session *se_sess,
 323         void *fabric_sess_ptr)
 324 {
 325         spin_lock_bh(&se_tpg->session_lock);
 326         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 327         spin_unlock_bh(&se_tpg->session_lock);
 328 }
 329 EXPORT_SYMBOL(transport_register_session);
 330
 331 void transport_deregister_session_configfs(struct se_session *se_sess)
 332 {
 333         struct se_node_acl *se_nacl;
 334         unsigned long flags;
 335         /*
 336          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 337          */
 338         se_nacl = se_sess->se_node_acl;
 339         if (se_nacl) {
 340                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 341                 list_del(&se_sess->sess_acl_list);
 342                 /*
 343                  * If the session list is empty, then clear the pointer.
 344                  * Otherwise, set the struct se_session pointer from the tail
 345                  * element of the per struct se_node_acl active session list.
 346                  */
 347                 if (list_empty(&se_nacl->acl_sess_list))
 348                         se_nacl->nacl_sess = NULL;
 349                 else {
 350                         se_nacl->nacl_sess = container_of(
 351                                         se_nacl->acl_sess_list.prev,
 352                                         struct se_session, sess_acl_list);
 353                 }
 354                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 355         }
 356 }
 357 EXPORT_SYMBOL(transport_deregister_session_configfs);
 358
 359 void transport_free_session(struct se_session *se_sess)
 360 {
 361         kmem_cache_free(se_sess_cache, se_sess);
 362 }
 363 EXPORT_SYMBOL(transport_free_session);
 364
 365 void transport_deregister_session(struct se_session *se_sess)
 366 {
 367         struct se_portal_group *se_tpg = se_sess->se_tpg;
 368         struct se_node_acl *se_nacl;
 369         unsigned long flags;
 370
 371         if (!se_tpg) {
 372                 transport_free_session(se_sess);
 373                 return;
 374         }
 375
 376         spin_lock_irqsave(&se_tpg->session_lock, flags);
 377         list_del(&se_sess->sess_list);
 378         se_sess->se_tpg = NULL;
 379         se_sess->fabric_sess_ptr = NULL;
 380         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 381
 382         /*
 383          * Determine if we need to do extra work for this initiator node's
 384          * struct se_node_acl if it had been previously dynamically generated.
 385          */
 386         se_nacl = se_sess->se_node_acl;
 387         if (se_nacl) {
 388                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 389                 if (se_nacl->dynamic_node_acl) {
 390                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 391                                         se_tpg)) {
 392                                 list_del(&se_nacl->acl_list);
 393                                 se_tpg->num_node_acls--;
 394                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 395
 396                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 397                                 core_free_device_list_for_node(se_nacl, se_tpg);
 398                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 399                                                 se_nacl);
 400                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 401                         }
 402                 }
 403                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 404         }
 405
 406         transport_free_session(se_sess);
 407
 408         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 409                 se_tpg->se_tpg_tfo->get_fabric_name());
 410 }
 411 EXPORT_SYMBOL(transport_deregister_session);
 412
 413 /*
 414  * Called with cmd->t_state_lock held.
 415  */
 416 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 417 {
 418         struct se_device *dev = cmd->se_dev;
 419         struct se_task *task;
 420         unsigned long flags;
 421
 422         if (!dev)
 423                 return;
 424
 425         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 426                 if (task->task_flags & TF_ACTIVE)
 427                         continue;
 428
 429                 if (!atomic_read(&task->task_state_active))
 430                         continue;
 431
 432                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 433                 list_del(&task->t_state_list);
 434                 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 435                         cmd->se_tfo->get_task_tag(cmd), dev, task);
 436                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 437
 438                 atomic_set(&task->task_state_active, 0);
 439                 atomic_dec(&cmd->t_task_cdbs_ex_left);
 440         }
 441 }
 442
 443 /*      transport_cmd_check_stop():
 444  *
 445  *      'transport_off = 1' determines if t_transport_active should be cleared.
 446  *      'transport_off = 2' determines if task_dev_state should be removed.
 447  *
 448  *      A non-zero u8 t_state sets cmd->t_state.
 449  *      Returns 1 when command is stopped, else 0.
 450  */
 451 static int transport_cmd_check_stop(
 452         struct se_cmd *cmd,
 453         int transport_off,
 454         u8 t_state)
 455 {
 456         unsigned long flags;
 457
 458         spin_lock_irqsave(&cmd->t_state_lock, flags);
 459         /*
 460          * Determine if IOCTL context caller in requesting the stopping of this
 461          * command for LUN shutdown purposes.
 462          */
 463         if (atomic_read(&cmd->transport_lun_stop)) {
 464                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 465                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 466                         cmd->se_tfo->get_task_tag(cmd));
 467
 468                 atomic_set(&cmd->t_transport_active, 0);
 469                 if (transport_off == 2)
 470                         transport_all_task_dev_remove_state(cmd);
 471                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 472
 473                 complete(&cmd->transport_lun_stop_comp);
 474                 return 1;
 475         }
 476         /*
 477          * Determine if frontend context caller is requesting the stopping of
 478          * this command for frontend exceptions.
 479          */
 480         if (atomic_read(&cmd->t_transport_stop)) {
 481                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 482                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 483                         cmd->se_tfo->get_task_tag(cmd));
 484
 485                 if (transport_off == 2)
 486                         transport_all_task_dev_remove_state(cmd);
 487
 488                 /*
 489                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 490                  * to FE.
 491                  */
 492                 if (transport_off == 2)
 493                         cmd->se_lun = NULL;
 494                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 495
 496                 complete(&cmd->t_transport_stop_comp);
 497                 return 1;
 498         }
 499         if (transport_off) {
 500                 atomic_set(&cmd->t_transport_active, 0);
 501                 if (transport_off == 2) {
 502                         transport_all_task_dev_remove_state(cmd);
 503                         /*
 504                          * Clear struct se_cmd->se_lun before the transport_off == 2
 505                          * handoff to fabric module.
 506                          */
 507                         cmd->se_lun = NULL;
 508                         /*
 509                          * Some fabric modules like tcm_loop can release
 510                          * their internally allocated I/O reference now and
 511                          * struct se_cmd now.
 512                          *
 513                          * Fabric modules are expected to return '1' here if the
 514                          * se_cmd being passed is released at this point,
 515                          * or zero if not being released.
 516                          */
 517                         if (cmd->se_tfo->check_stop_free != NULL) {
 518                                 spin_unlock_irqrestore(
 519                                         &cmd->t_state_lock, flags);
 520
 521                                 return cmd->se_tfo->check_stop_free(cmd);
 522                         }
 523                 }
 524                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 525
 526                 return 0;
 527         } else if (t_state)
 528                 cmd->t_state = t_state;
 529         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 530
 531         return 0;
 532 }
 533
 534 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 535 {
 536         return transport_cmd_check_stop(cmd, 2, 0);
 537 }
 538
 539 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 540 {
 541         struct se_lun *lun = cmd->se_lun;
 542         unsigned long flags;
 543
 544         if (!lun)
 545                 return;
 546
 547         spin_lock_irqsave(&cmd->t_state_lock, flags);
 548         if (!atomic_read(&cmd->transport_dev_active)) {
 549                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 550                 goto check_lun;
 551         }
 552         atomic_set(&cmd->transport_dev_active, 0);
 553         transport_all_task_dev_remove_state(cmd);
 554         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 555
 556
 557 check_lun:
 558         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 559         if (atomic_read(&cmd->transport_lun_active)) {
 560                 list_del(&cmd->se_lun_node);
 561                 atomic_set(&cmd->transport_lun_active, 0);
 562 #if 0
 563                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 564                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 565 #endif
 566         }
 567         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 568 }
 569
 570 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 571 {
 572         if (!cmd->se_tmr_req)
 573                 transport_lun_remove_cmd(cmd);
 574
 575         if (transport_cmd_check_stop_to_fabric(cmd))
 576                 return;
 577         if (remove) {
 578                 transport_remove_cmd_from_queue(cmd);
 579                 transport_put_cmd(cmd);
 580         }
 581 }
 582
 583 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 584                 bool at_head)
 585 {
 586         struct se_device *dev = cmd->se_dev;
 587         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 588         unsigned long flags;
 589
 590         if (t_state) {
 591                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 592                 cmd->t_state = t_state;
 593                 atomic_set(&cmd->t_transport_active, 1);
 594                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 595         }
 596
 597         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 598
 599         /* If the cmd is already on the list, remove it before we add it */
 600         if (!list_empty(&cmd->se_queue_node))
 601                 list_del(&cmd->se_queue_node);
 602         else
 603                 atomic_inc(&qobj->queue_cnt);
 604
 605         if (at_head)
 606                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 607         else
 608                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 609         atomic_set(&cmd->t_transport_queue_active, 1);
 610         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 611
 612         wake_up_interruptible(&qobj->thread_wq);
 613 }
 614
 615 static struct se_cmd *
 616 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 617 {
 618         struct se_cmd *cmd;
 619         unsigned long flags;
 620
 621         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 622         if (list_empty(&qobj->qobj_list)) {
 623                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 624                 return NULL;
 625         }
 626         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 627
 628         atomic_set(&cmd->t_transport_queue_active, 0);
 629
 630         list_del_init(&cmd->se_queue_node);
 631         atomic_dec(&qobj->queue_cnt);
 632         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 633
 634         return cmd;
 635 }
 636
 637 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 638 {
 639         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 640         unsigned long flags;
 641
 642         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 643         if (!atomic_read(&cmd->t_transport_queue_active)) {
 644                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 645                 return;
 646         }
 647         atomic_set(&cmd->t_transport_queue_active, 0);
 648         atomic_dec(&qobj->queue_cnt);
 649         list_del_init(&cmd->se_queue_node);
 650         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 651
 652         if (atomic_read(&cmd->t_transport_queue_active)) {
 653                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 654                         cmd->se_tfo->get_task_tag(cmd),
 655                         atomic_read(&cmd->t_transport_queue_active));
 656         }
 657 }
 658
 659 /*
 660  * Completion function used by TCM subsystem plugins (such as FILEIO)
 661  * for queueing up response from struct se_subsystem_api->do_task()
 662  */
 663 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 664 {
 665         struct se_task *task = list_entry(cmd->t_task_list.next,
 666                                 struct se_task, t_list);
 667
 668         if (good) {
 669                 cmd->scsi_status = SAM_STAT_GOOD;
 670                 task->task_scsi_status = GOOD;
 671         } else {
 672                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 673                 task->task_se_cmd->scsi_sense_reason =
 674                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 675
 676         }
 677
 678         transport_complete_task(task, good);
 679 }
 680 EXPORT_SYMBOL(transport_complete_sync_cache);
 681
 682 static void target_complete_failure_work(struct work_struct *work)
 683 {
 684         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 685
 686         transport_generic_request_failure(cmd);
 687 }
 688
 689 /*      transport_complete_task():
 690  *
 691  *      Called from interrupt and non interrupt context depending
 692  *      on the transport plugin.
 693  */
 694 void transport_complete_task(struct se_task *task, int success)
 695 {
 696         struct se_cmd *cmd = task->task_se_cmd;
 697         struct se_device *dev = cmd->se_dev;
 698         unsigned long flags;
 699 #if 0
 700         pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
 701                         cmd->t_task_cdb[0], dev);
 702 #endif
 703         if (dev)
 704                 atomic_inc(&dev->depth_left);
 705
 706         spin_lock_irqsave(&cmd->t_state_lock, flags);
 707         task->task_flags &= ~TF_ACTIVE;
 708
 709         /*
 710          * See if any sense data exists, if so set the TASK_SENSE flag.
 711          * Also check for any other post completion work that needs to be
 712          * done by the plugins.
 713          */
 714         if (dev && dev->transport->transport_complete) {
 715                 if (dev->transport->transport_complete(task) != 0) {
 716                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 717                         task->task_sense = 1;
 718                         success = 1;
 719                 }
 720         }
 721
 722         /*
 723          * See if we are waiting for outstanding struct se_task
 724          * to complete for an exception condition
 725          */
 726         if (task->task_flags & TF_REQUEST_STOP) {
 727                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 728                 complete(&task->task_stop_comp);
 729                 return;
 730         }
 731
 732         if (!success)
 733                 cmd->t_tasks_failed = 1;
 734
 735         /*
 736          * Decrement the outstanding t_task_cdbs_left count.  The last
 737          * struct se_task from struct se_cmd will complete itself into the
 738          * device queue depending upon int success.
 739          */
 740         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 741                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 742                 return;
 743         }
 744
 745         if (cmd->t_tasks_failed) {
 746                 if (!task->task_error_status) {
 747                         task->task_error_status =
 748                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 749                         cmd->scsi_sense_reason =
 750                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 751                 }
 752
 753                 INIT_WORK(&cmd->work, target_complete_failure_work);
 754         } else {
 755                 atomic_set(&cmd->t_transport_complete, 1);
 756                 INIT_WORK(&cmd->work, target_complete_ok_work);
 757         }
 758
 759         cmd->t_state = TRANSPORT_COMPLETE;
 760         atomic_set(&cmd->t_transport_active, 1);
 761         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 762
 763         queue_work(target_completion_wq, &cmd->work);
 764 }
 765 EXPORT_SYMBOL(transport_complete_task);
 766
 767 /*
 768  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 769  * struct se_task list are ready to be added to the active execution list
 770  * struct se_device
 771
 772  * Called with se_dev_t->execute_task_lock called.
 773  */
 774 static inline int transport_add_task_check_sam_attr(
 775         struct se_task *task,
 776         struct se_task *task_prev,
 777         struct se_device *dev)
 778 {
 779         /*
 780          * No SAM Task attribute emulation enabled, add to tail of
 781          * execution queue
 782          */
 783         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 784                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 785                 return 0;
 786         }
 787         /*
 788          * HEAD_OF_QUEUE attribute for received CDB, which means
 789          * the first task that is associated with a struct se_cmd goes to
 790          * head of the struct se_device->execute_task_list, and task_prev
 791          * after that for each subsequent task
 792          */
 793         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 794                 list_add(&task->t_execute_list,
 795                                 (task_prev != NULL) ?
 796                                 &task_prev->t_execute_list :
 797                                 &dev->execute_task_list);
 798
 799                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 800                                 " in execution queue\n",
 801                                 task->task_se_cmd->t_task_cdb[0]);
 802                 return 1;
 803         }
 804         /*
 805          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 806          * transitioned from Dermant -> Active state, and are added to the end
 807          * of the struct se_device->execute_task_list
 808          */
 809         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 810         return 0;
 811 }
 812
 813 /*      __transport_add_task_to_execute_queue():
 814  *
 815  *      Called with se_dev_t->execute_task_lock called.
 816  */
 817 static void __transport_add_task_to_execute_queue(
 818         struct se_task *task,
 819         struct se_task *task_prev,
 820         struct se_device *dev)
 821 {
 822         int head_of_queue;
 823
 824         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 825         atomic_inc(&dev->execute_tasks);
 826
 827         if (atomic_read(&task->task_state_active))
 828                 return;
 829         /*
 830          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 831          * state list as well.  Running with SAM Task Attribute emulation
 832          * will always return head_of_queue == 0 here
 833          */
 834         if (head_of_queue)
 835                 list_add(&task->t_state_list, (task_prev) ?
 836                                 &task_prev->t_state_list :
 837                                 &dev->state_task_list);
 838         else
 839                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 840
 841         atomic_set(&task->task_state_active, 1);
 842
 843         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 844                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 845                 task, dev);
 846 }
 847
 848 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 849 {
 850         struct se_device *dev = cmd->se_dev;
 851         struct se_task *task;
 852         unsigned long flags;
 853
 854         spin_lock_irqsave(&cmd->t_state_lock, flags);
 855         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 856                 if (atomic_read(&task->task_state_active))
 857                         continue;
 858
 859                 spin_lock(&dev->execute_task_lock);
 860                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 861                 atomic_set(&task->task_state_active, 1);
 862
 863                 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 864                         task->task_se_cmd->se_tfo->get_task_tag(
 865                         task->task_se_cmd), task, dev);
 866
 867                 spin_unlock(&dev->execute_task_lock);
 868         }
 869         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 870 }
 871
 872 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 873 {
 874         struct se_device *dev = cmd->se_dev;
 875         struct se_task *task, *task_prev = NULL;
 876         unsigned long flags;
 877
 878         spin_lock_irqsave(&dev->execute_task_lock, flags);
 879         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 880                 if (!list_empty(&task->t_execute_list))
 881                         continue;
 882                 /*
 883                  * __transport_add_task_to_execute_queue() handles the
 884                  * SAM Task Attribute emulation if enabled
 885                  */
 886                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 887                 task_prev = task;
 888         }
 889         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 890 }
 891
 892 void __transport_remove_task_from_execute_queue(struct se_task *task,
 893                 struct se_device *dev)
 894 {
 895         list_del_init(&task->t_execute_list);
 896         atomic_dec(&dev->execute_tasks);
 897 }
 898
 899 void transport_remove_task_from_execute_queue(
 900         struct se_task *task,
 901         struct se_device *dev)
 902 {
 903         unsigned long flags;
 904
 905         if (WARN_ON(list_empty(&task->t_execute_list)))
 906                 return;
 907
 908         spin_lock_irqsave(&dev->execute_task_lock, flags);
 909         __transport_remove_task_from_execute_queue(task, dev);
 910         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 911 }
 912
 913 /*
 914  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 915  */
 916
 917 static void target_qf_do_work(struct work_struct *work)
 918 {
 919         struct se_device *dev = container_of(work, struct se_device,
 920                                         qf_work_queue);
 921         LIST_HEAD(qf_cmd_list);
 922         struct se_cmd *cmd, *cmd_tmp;
 923
 924         spin_lock_irq(&dev->qf_cmd_lock);
 925         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 926         spin_unlock_irq(&dev->qf_cmd_lock);
 927
 928         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 929                 list_del(&cmd->se_qf_node);
 930                 atomic_dec(&dev->dev_qf_count);
 931                 smp_mb__after_atomic_dec();
 932
 933                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 934                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 935                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 936                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 937                         : "UNKNOWN");
 938
 939                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 940         }
 941 }
 942
 943 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 944 {
 945         switch (cmd->data_direction) {
 946         case DMA_NONE:
 947                 return "NONE";
 948         case DMA_FROM_DEVICE:
 949                 return "READ";
 950         case DMA_TO_DEVICE:
 951                 return "WRITE";
 952         case DMA_BIDIRECTIONAL:
 953                 return "BIDI";
 954         default:
 955                 break;
 956         }
 957
 958         return "UNKNOWN";
 959 }
 960
 961 void transport_dump_dev_state(
 962         struct se_device *dev,
 963         char *b,
 964         int *bl)
 965 {
 966         *bl += sprintf(b + *bl, "Status: ");
 967         switch (dev->dev_status) {
 968         case TRANSPORT_DEVICE_ACTIVATED:
 969                 *bl += sprintf(b + *bl, "ACTIVATED");
 970                 break;
 971         case TRANSPORT_DEVICE_DEACTIVATED:
 972                 *bl += sprintf(b + *bl, "DEACTIVATED");
 973                 break;
 974         case TRANSPORT_DEVICE_SHUTDOWN:
 975                 *bl += sprintf(b + *bl, "SHUTDOWN");
 976                 break;
 977         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 978         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 979                 *bl += sprintf(b + *bl, "OFFLINE");
 980                 break;
 981         default:
 982                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 983                 break;
 984         }
 985
 986         *bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
 987                 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
 988                 dev->queue_depth);
 989         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
 990                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 991         *bl += sprintf(b + *bl, "        ");
 992 }
 993
 994 void transport_dump_vpd_proto_id(
 995         struct t10_vpd *vpd,
 996         unsigned char *p_buf,
 997         int p_buf_len)
 998 {
 999         unsigned char buf[VPD_TMP_BUF_SIZE];
1000         int len;
1001
1002         memset(buf, 0, VPD_TMP_BUF_SIZE);
1003         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1004
1005         switch (vpd->protocol_identifier) {
1006         case 0x00:
1007                 sprintf(buf+len, "Fibre Channel\n");
1008                 break;
1009         case 0x10:
1010                 sprintf(buf+len, "Parallel SCSI\n");
1011                 break;
1012         case 0x20:
1013                 sprintf(buf+len, "SSA\n");
1014                 break;
1015         case 0x30:
1016                 sprintf(buf+len, "IEEE 1394\n");
1017                 break;
1018         case 0x40:
1019                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1020                                 " Protocol\n");
1021                 break;
1022         case 0x50:
1023                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1024                 break;
1025         case 0x60:
1026                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1027                 break;
1028         case 0x70:
1029                 sprintf(buf+len, "Automation/Drive Interface Transport"
1030                                 " Protocol\n");
1031                 break;
1032         case 0x80:
1033                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1034                 break;
1035         default:
1036                 sprintf(buf+len, "Unknown 0x%02x\n",
1037                                 vpd->protocol_identifier);
1038                 break;
1039         }
1040
1041         if (p_buf)
1042                 strncpy(p_buf, buf, p_buf_len);
1043         else
1044                 pr_debug("%s", buf);
1045 }
1046
1047 void
1048 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1049 {
1050         /*
1051          * Check if the Protocol Identifier Valid (PIV) bit is set..
1052          *
1053          * from spc3r23.pdf section 7.5.1
1054          */
1055          if (page_83[1] & 0x80) {
1056                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1057                 vpd->protocol_identifier_set = 1;
1058                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1059         }
1060 }
1061 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1062
1063 int transport_dump_vpd_assoc(
1064         struct t10_vpd *vpd,
1065         unsigned char *p_buf,
1066         int p_buf_len)
1067 {
1068         unsigned char buf[VPD_TMP_BUF_SIZE];
1069         int ret = 0;
1070         int len;
1071
1072         memset(buf, 0, VPD_TMP_BUF_SIZE);
1073         len = sprintf(buf, "T10 VPD Identifier Association: ");
1074
1075         switch (vpd->association) {
1076         case 0x00:
1077                 sprintf(buf+len, "addressed logical unit\n");
1078                 break;
1079         case 0x10:
1080                 sprintf(buf+len, "target port\n");
1081                 break;
1082         case 0x20:
1083                 sprintf(buf+len, "SCSI target device\n");
1084                 break;
1085         default:
1086                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1087                 ret = -EINVAL;
1088                 break;
1089         }
1090
1091         if (p_buf)
1092                 strncpy(p_buf, buf, p_buf_len);
1093         else
1094                 pr_debug("%s", buf);
1095
1096         return ret;
1097 }
1098
1099 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1100 {
1101         /*
1102          * The VPD identification association..
1103          *
1104          * from spc3r23.pdf Section 7.6.3.1 Table 297
1105          */
1106         vpd->association = (page_83[1] & 0x30);
1107         return transport_dump_vpd_assoc(vpd, NULL, 0);
1108 }
1109 EXPORT_SYMBOL(transport_set_vpd_assoc);
1110
1111 int transport_dump_vpd_ident_type(
1112         struct t10_vpd *vpd,
1113         unsigned char *p_buf,
1114         int p_buf_len)
1115 {
1116         unsigned char buf[VPD_TMP_BUF_SIZE];
1117         int ret = 0;
1118         int len;
1119
1120         memset(buf, 0, VPD_TMP_BUF_SIZE);
1121         len = sprintf(buf, "T10 VPD Identifier Type: ");
1122
1123         switch (vpd->device_identifier_type) {
1124         case 0x00:
1125                 sprintf(buf+len, "Vendor specific\n");
1126                 break;
1127         case 0x01:
1128                 sprintf(buf+len, "T10 Vendor ID based\n");
1129                 break;
1130         case 0x02:
1131                 sprintf(buf+len, "EUI-64 based\n");
1132                 break;
1133         case 0x03:
1134                 sprintf(buf+len, "NAA\n");
1135                 break;
1136         case 0x04:
1137                 sprintf(buf+len, "Relative target port identifier\n");
1138                 break;
1139         case 0x08:
1140                 sprintf(buf+len, "SCSI name string\n");
1141                 break;
1142         default:
1143                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1144                                 vpd->device_identifier_type);
1145                 ret = -EINVAL;
1146                 break;
1147         }
1148
1149         if (p_buf) {
1150                 if (p_buf_len < strlen(buf)+1)
1151                         return -EINVAL;
1152                 strncpy(p_buf, buf, p_buf_len);
1153         } else {
1154                 pr_debug("%s", buf);
1155         }
1156
1157         return ret;
1158 }
1159
1160 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1161 {
1162         /*
1163          * The VPD identifier type..
1164          *
1165          * from spc3r23.pdf Section 7.6.3.1 Table 298
1166          */
1167         vpd->device_identifier_type = (page_83[1] & 0x0f);
1168         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1169 }
1170 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1171
1172 int transport_dump_vpd_ident(
1173         struct t10_vpd *vpd,
1174         unsigned char *p_buf,
1175         int p_buf_len)
1176 {
1177         unsigned char buf[VPD_TMP_BUF_SIZE];
1178         int ret = 0;
1179
1180         memset(buf, 0, VPD_TMP_BUF_SIZE);
1181
1182         switch (vpd->device_identifier_code_set) {
1183         case 0x01: /* Binary */
1184                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1185                         &vpd->device_identifier[0]);
1186                 break;
1187         case 0x02: /* ASCII */
1188                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1189                         &vpd->device_identifier[0]);
1190                 break;
1191         case 0x03: /* UTF-8 */
1192                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1193                         &vpd->device_identifier[0]);
1194                 break;
1195         default:
1196                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1197                         " 0x%02x", vpd->device_identifier_code_set);
1198                 ret = -EINVAL;
1199                 break;
1200         }
1201
1202         if (p_buf)
1203                 strncpy(p_buf, buf, p_buf_len);
1204         else
1205                 pr_debug("%s", buf);
1206
1207         return ret;
1208 }
1209
1210 int
1211 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1212 {
1213         static const char hex_str[] = "0123456789abcdef";
1214         int j = 0, i = 4; /* offset to start of the identifer */
1215
1216         /*
1217          * The VPD Code Set (encoding)
1218          *
1219          * from spc3r23.pdf Section 7.6.3.1 Table 296
1220          */
1221         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1222         switch (vpd->device_identifier_code_set) {
1223         case 0x01: /* Binary */
1224                 vpd->device_identifier[j++] =
1225                                 hex_str[vpd->device_identifier_type];
1226                 while (i < (4 + page_83[3])) {
1227                         vpd->device_identifier[j++] =
1228                                 hex_str[(page_83[i] & 0xf0) >> 4];
1229                         vpd->device_identifier[j++] =
1230                                 hex_str[page_83[i] & 0x0f];
1231                         i++;
1232                 }
1233                 break;
1234         case 0x02: /* ASCII */
1235         case 0x03: /* UTF-8 */
1236                 while (i < (4 + page_83[3]))
1237                         vpd->device_identifier[j++] = page_83[i++];
1238                 break;
1239         default:
1240                 break;
1241         }
1242
1243         return transport_dump_vpd_ident(vpd, NULL, 0);
1244 }
1245 EXPORT_SYMBOL(transport_set_vpd_ident);
1246
1247 static void core_setup_task_attr_emulation(struct se_device *dev)
1248 {
1249         /*
1250          * If this device is from Target_Core_Mod/pSCSI, disable the
1251          * SAM Task Attribute emulation.
1252          *
1253          * This is currently not available in upsream Linux/SCSI Target
1254          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1255          */
1256         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1257                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1258                 return;
1259         }
1260
1261         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1262         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1263                 " device\n", dev->transport->name,
1264                 dev->transport->get_device_rev(dev));
1265 }
1266
1267 static void scsi_dump_inquiry(struct se_device *dev)
1268 {
1269         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1270         int i, device_type;
1271         /*
1272          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1273          */
1274         pr_debug("  Vendor: ");
1275         for (i = 0; i < 8; i++)
1276                 if (wwn->vendor[i] >= 0x20)
1277                         pr_debug("%c", wwn->vendor[i]);
1278                 else
1279                         pr_debug(" ");
1280
1281         pr_debug("  Model: ");
1282         for (i = 0; i < 16; i++)
1283                 if (wwn->model[i] >= 0x20)
1284                         pr_debug("%c", wwn->model[i]);
1285                 else
1286                         pr_debug(" ");
1287
1288         pr_debug("  Revision: ");
1289         for (i = 0; i < 4; i++)
1290                 if (wwn->revision[i] >= 0x20)
1291                         pr_debug("%c", wwn->revision[i]);
1292                 else
1293                         pr_debug(" ");
1294
1295         pr_debug("\n");
1296
1297         device_type = dev->transport->get_device_type(dev);
1298         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1299         pr_debug("                 ANSI SCSI revision: %02x\n",
1300                                 dev->transport->get_device_rev(dev));
1301 }
1302
1303 struct se_device *transport_add_device_to_core_hba(
1304         struct se_hba *hba,
1305         struct se_subsystem_api *transport,
1306         struct se_subsystem_dev *se_dev,
1307         u32 device_flags,
1308         void *transport_dev,
1309         struct se_dev_limits *dev_limits,
1310         const char *inquiry_prod,
1311         const char *inquiry_rev)
1312 {
1313         int force_pt;
1314         struct se_device  *dev;
1315
1316         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1317         if (!dev) {
1318                 pr_err("Unable to allocate memory for se_dev_t\n");
1319                 return NULL;
1320         }
1321
1322         transport_init_queue_obj(&dev->dev_queue_obj);
1323         dev->dev_flags          = device_flags;
1324         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1325         dev->dev_ptr            = transport_dev;
1326         dev->se_hba             = hba;
1327         dev->se_sub_dev         = se_dev;
1328         dev->transport          = transport;
1329         INIT_LIST_HEAD(&dev->dev_list);
1330         INIT_LIST_HEAD(&dev->dev_sep_list);
1331         INIT_LIST_HEAD(&dev->dev_tmr_list);
1332         INIT_LIST_HEAD(&dev->execute_task_list);
1333         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1334         INIT_LIST_HEAD(&dev->state_task_list);
1335         INIT_LIST_HEAD(&dev->qf_cmd_list);
1336         spin_lock_init(&dev->execute_task_lock);
1337         spin_lock_init(&dev->delayed_cmd_lock);
1338         spin_lock_init(&dev->dev_reservation_lock);
1339         spin_lock_init(&dev->dev_status_lock);
1340         spin_lock_init(&dev->se_port_lock);
1341         spin_lock_init(&dev->se_tmr_lock);
1342         spin_lock_init(&dev->qf_cmd_lock);
1343
1344         dev->queue_depth        = dev_limits->queue_depth;
1345         atomic_set(&dev->depth_left, dev->queue_depth);
1346         atomic_set(&dev->dev_ordered_id, 0);
1347
1348         se_dev_set_default_attribs(dev, dev_limits);
1349
1350         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1351         dev->creation_time = get_jiffies_64();
1352         spin_lock_init(&dev->stats_lock);
1353
1354         spin_lock(&hba->device_lock);
1355         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1356         hba->dev_count++;
1357         spin_unlock(&hba->device_lock);
1358         /*
1359          * Setup the SAM Task Attribute emulation for struct se_device
1360          */
1361         core_setup_task_attr_emulation(dev);
1362         /*
1363          * Force PR and ALUA passthrough emulation with internal object use.
1364          */
1365         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1366         /*
1367          * Setup the Reservations infrastructure for struct se_device
1368          */
1369         core_setup_reservations(dev, force_pt);
1370         /*
1371          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1372          */
1373         if (core_setup_alua(dev, force_pt) < 0)
1374                 goto out;
1375
1376         /*
1377          * Startup the struct se_device processing thread
1378          */
1379         dev->process_thread = kthread_run(transport_processing_thread, dev,
1380                                           "LIO_%s", dev->transport->name);
1381         if (IS_ERR(dev->process_thread)) {
1382                 pr_err("Unable to create kthread: LIO_%s\n",
1383                         dev->transport->name);
1384                 goto out;
1385         }
1386         /*
1387          * Setup work_queue for QUEUE_FULL
1388          */
1389         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1390         /*
1391          * Preload the initial INQUIRY const values if we are doing
1392          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1393          * passthrough because this is being provided by the backend LLD.
1394          * This is required so that transport_get_inquiry() copies these
1395          * originals once back into DEV_T10_WWN(dev) for the virtual device
1396          * setup.
1397          */
1398         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1399                 if (!inquiry_prod || !inquiry_rev) {
1400                         pr_err("All non TCM/pSCSI plugins require"
1401                                 " INQUIRY consts\n");
1402                         goto out;
1403                 }
1404
1405                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1406                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1407                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1408         }
1409         scsi_dump_inquiry(dev);
1410
1411         return dev;
1412 out:
1413         kthread_stop(dev->process_thread);
1414
1415         spin_lock(&hba->device_lock);
1416         list_del(&dev->dev_list);
1417         hba->dev_count--;
1418         spin_unlock(&hba->device_lock);
1419
1420         se_release_vpd_for_dev(dev);
1421
1422         kfree(dev);
1423
1424         return NULL;
1425 }
1426 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1427
1428 /*      transport_generic_prepare_cdb():
1429  *
1430  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1431  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1432  *      The point of this is since we are mapping iSCSI LUNs to
1433  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1434  *      devices and HBAs for a loop.
1435  */
1436 static inline void transport_generic_prepare_cdb(
1437         unsigned char *cdb)
1438 {
1439         switch (cdb[0]) {
1440         case READ_10: /* SBC - RDProtect */
1441         case READ_12: /* SBC - RDProtect */
1442         case READ_16: /* SBC - RDProtect */
1443         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1444         case VERIFY: /* SBC - VRProtect */
1445         case VERIFY_16: /* SBC - VRProtect */
1446         case WRITE_VERIFY: /* SBC - VRProtect */
1447         case WRITE_VERIFY_12: /* SBC - VRProtect */
1448                 break;
1449         default:
1450                 cdb[1] &= 0x1f; /* clear logical unit number */
1451                 break;
1452         }
1453 }
1454
1455 static struct se_task *
1456 transport_generic_get_task(struct se_cmd *cmd,
1457                 enum dma_data_direction data_direction)
1458 {
1459         struct se_task *task;
1460         struct se_device *dev = cmd->se_dev;
1461
1462         task = dev->transport->alloc_task(cmd->t_task_cdb);
1463         if (!task) {
1464                 pr_err("Unable to allocate struct se_task\n");
1465                 return NULL;
1466         }
1467
1468         INIT_LIST_HEAD(&task->t_list);
1469         INIT_LIST_HEAD(&task->t_execute_list);
1470         INIT_LIST_HEAD(&task->t_state_list);
1471         init_completion(&task->task_stop_comp);
1472         task->task_se_cmd = cmd;
1473         task->task_data_direction = data_direction;
1474
1475         return task;
1476 }
1477
1478 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1479
1480 /*
1481  * Used by fabric modules containing a local struct se_cmd within their
1482  * fabric dependent per I/O descriptor.
1483  */
1484 void transport_init_se_cmd(
1485         struct se_cmd *cmd,
1486         struct target_core_fabric_ops *tfo,
1487         struct se_session *se_sess,
1488         u32 data_length,
1489         int data_direction,
1490         int task_attr,
1491         unsigned char *sense_buffer)
1492 {
1493         INIT_LIST_HEAD(&cmd->se_lun_node);
1494         INIT_LIST_HEAD(&cmd->se_delayed_node);
1495         INIT_LIST_HEAD(&cmd->se_qf_node);
1496         INIT_LIST_HEAD(&cmd->se_queue_node);
1497         INIT_LIST_HEAD(&cmd->se_cmd_list);
1498         INIT_LIST_HEAD(&cmd->t_task_list);
1499         init_completion(&cmd->transport_lun_fe_stop_comp);
1500         init_completion(&cmd->transport_lun_stop_comp);
1501         init_completion(&cmd->t_transport_stop_comp);
1502         init_completion(&cmd->cmd_wait_comp);
1503         spin_lock_init(&cmd->t_state_lock);
1504         atomic_set(&cmd->transport_dev_active, 1);
1505
1506         cmd->se_tfo = tfo;
1507         cmd->se_sess = se_sess;
1508         cmd->data_length = data_length;
1509         cmd->data_direction = data_direction;
1510         cmd->sam_task_attr = task_attr;
1511         cmd->sense_buffer = sense_buffer;
1512 }
1513 EXPORT_SYMBOL(transport_init_se_cmd);
1514
1515 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1516 {
1517         /*
1518          * Check if SAM Task Attribute emulation is enabled for this
1519          * struct se_device storage object
1520          */
1521         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1522                 return 0;
1523
1524         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1525                 pr_debug("SAM Task Attribute ACA"
1526                         " emulation is not supported\n");
1527                 return -EINVAL;
1528         }
1529         /*
1530          * Used to determine when ORDERED commands should go from
1531          * Dormant to Active status.
1532          */
1533         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1534         smp_mb__after_atomic_inc();
1535         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1536                         cmd->se_ordered_id, cmd->sam_task_attr,
1537                         cmd->se_dev->transport->name);
1538         return 0;
1539 }
1540
1541 /*      transport_generic_allocate_tasks():
1542  *
1543  *      Called from fabric RX Thread.
1544  */
1545 int transport_generic_allocate_tasks(
1546         struct se_cmd *cmd,
1547         unsigned char *cdb)
1548 {
1549         int ret;
1550
1551         transport_generic_prepare_cdb(cdb);
1552         /*
1553          * Ensure that the received CDB is less than the max (252 + 8) bytes
1554          * for VARIABLE_LENGTH_CMD
1555          */
1556         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1557                 pr_err("Received SCSI CDB with command_size: %d that"
1558                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1559                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1560                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1561                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1562                 return -EINVAL;
1563         }
1564         /*
1565          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1566          * allocate the additional extended CDB buffer now..  Otherwise
1567          * setup the pointer from __t_task_cdb to t_task_cdb.
1568          */
1569         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1570                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1571                                                 GFP_KERNEL);
1572                 if (!cmd->t_task_cdb) {
1573                         pr_err("Unable to allocate cmd->t_task_cdb"
1574                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1575                                 scsi_command_size(cdb),
1576                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1577                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1578                         cmd->scsi_sense_reason =
1579                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1580                         return -ENOMEM;
1581                 }
1582         } else
1583                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1584         /*
1585          * Copy the original CDB into cmd->
1586          */
1587         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1588         /*
1589          * Setup the received CDB based on SCSI defined opcodes and
1590          * perform unit attention, persistent reservations and ALUA
1591          * checks for virtual device backends.  The cmd->t_task_cdb
1592          * pointer is expected to be setup before we reach this point.
1593          */
1594         ret = transport_generic_cmd_sequencer(cmd, cdb);
1595         if (ret < 0)
1596                 return ret;
1597         /*
1598          * Check for SAM Task Attribute Emulation
1599          */
1600         if (transport_check_alloc_task_attr(cmd) < 0) {
1601                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1602                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1603                 return -EINVAL;
1604         }
1605         spin_lock(&cmd->se_lun->lun_sep_lock);
1606         if (cmd->se_lun->lun_sep)
1607                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1608         spin_unlock(&cmd->se_lun->lun_sep_lock);
1609         return 0;
1610 }
1611 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1612
1613 /*
1614  * Used by fabric module frontends to queue tasks directly.
1615  * Many only be used from process context only
1616  */
1617 int transport_handle_cdb_direct(
1618         struct se_cmd *cmd)
1619 {
1620         int ret;
1621
1622         if (!cmd->se_lun) {
1623                 dump_stack();
1624                 pr_err("cmd->se_lun is NULL\n");
1625                 return -EINVAL;
1626         }
1627         if (in_interrupt()) {
1628                 dump_stack();
1629                 pr_err("transport_generic_handle_cdb cannot be called"
1630                                 " from interrupt context\n");
1631                 return -EINVAL;
1632         }
1633         /*
1634          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1635          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1636          * in existing usage to ensure that outstanding descriptors are handled
1637          * correctly during shutdown via transport_wait_for_tasks()
1638          *
1639          * Also, we don't take cmd->t_state_lock here as we only expect
1640          * this to be called for initial descriptor submission.
1641          */
1642         cmd->t_state = TRANSPORT_NEW_CMD;
1643         atomic_set(&cmd->t_transport_active, 1);
1644         /*
1645          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1646          * so follow TRANSPORT_NEW_CMD processing thread context usage
1647          * and call transport_generic_request_failure() if necessary..
1648          */
1649         ret = transport_generic_new_cmd(cmd);
1650         if (ret < 0)
1651                 transport_generic_request_failure(cmd);
1652
1653         return 0;
1654 }
1655 EXPORT_SYMBOL(transport_handle_cdb_direct);
1656
1657 /*
1658  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1659  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1660  * complete setup in TCM process context w/ TFO->new_cmd_map().
1661  */
1662 int transport_generic_handle_cdb_map(
1663         struct se_cmd *cmd)
1664 {
1665         if (!cmd->se_lun) {
1666                 dump_stack();
1667                 pr_err("cmd->se_lun is NULL\n");
1668                 return -EINVAL;
1669         }
1670
1671         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1672         return 0;
1673 }
1674 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1675
1676 /*      transport_generic_handle_data():
1677  *
1678  *
1679  */
1680 int transport_generic_handle_data(
1681         struct se_cmd *cmd)
1682 {
1683         /*
1684          * For the software fabric case, then we assume the nexus is being
1685          * failed/shutdown when signals are pending from the kthread context
1686          * caller, so we return a failure.  For the HW target mode case running
1687          * in interrupt code, the signal_pending() check is skipped.
1688          */
1689         if (!in_interrupt() && signal_pending(current))
1690                 return -EPERM;
1691         /*
1692          * If the received CDB has aleady been ABORTED by the generic
1693          * target engine, we now call transport_check_aborted_status()
1694          * to queue any delated TASK_ABORTED status for the received CDB to the
1695          * fabric module as we are expecting no further incoming DATA OUT
1696          * sequences at this point.
1697          */
1698         if (transport_check_aborted_status(cmd, 1) != 0)
1699                 return 0;
1700
1701         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1702         return 0;
1703 }
1704 EXPORT_SYMBOL(transport_generic_handle_data);
1705
1706 /*      transport_generic_handle_tmr():
1707  *
1708  *
1709  */
1710 int transport_generic_handle_tmr(
1711         struct se_cmd *cmd)
1712 {
1713         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1714         return 0;
1715 }
1716 EXPORT_SYMBOL(transport_generic_handle_tmr);
1717
1718 /*
1719  * If the task is active, request it to be stopped and sleep until it
1720  * has completed.
1721  */
1722 bool target_stop_task(struct se_task *task, unsigned long *flags)
1723 {
1724         struct se_cmd *cmd = task->task_se_cmd;
1725         bool was_active = false;
1726
1727         if (task->task_flags & TF_ACTIVE) {
1728                 task->task_flags |= TF_REQUEST_STOP;
1729                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1730
1731                 pr_debug("Task %p waiting to complete\n", task);
1732                 wait_for_completion(&task->task_stop_comp);
1733                 pr_debug("Task %p stopped successfully\n", task);
1734
1735                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1736                 atomic_dec(&cmd->t_task_cdbs_left);
1737                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1738                 was_active = true;
1739         }
1740
1741         return was_active;
1742 }
1743
1744 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1745 {
1746         struct se_task *task, *task_tmp;
1747         unsigned long flags;
1748         int ret = 0;
1749
1750         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1751                 cmd->se_tfo->get_task_tag(cmd));
1752
1753         /*
1754          * No tasks remain in the execution queue
1755          */
1756         spin_lock_irqsave(&cmd->t_state_lock, flags);
1757         list_for_each_entry_safe(task, task_tmp,
1758                                 &cmd->t_task_list, t_list) {
1759                 pr_debug("Processing task %p\n", task);
1760                 /*
1761                  * If the struct se_task has not been sent and is not active,
1762                  * remove the struct se_task from the execution queue.
1763                  */
1764                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1765                         spin_unlock_irqrestore(&cmd->t_state_lock,
1766                                         flags);
1767                         transport_remove_task_from_execute_queue(task,
1768                                         cmd->se_dev);
1769
1770                         pr_debug("Task %p removed from execute queue\n", task);
1771                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1772                         continue;
1773                 }
1774
1775                 if (!target_stop_task(task, &flags)) {
1776                         pr_debug("Task %p - did nothing\n", task);
1777                         ret++;
1778                 }
1779         }
1780         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1781
1782         return ret;
1783 }
1784
1785 /*
1786  * Handle SAM-esque emulation for generic transport request failures.
1787  */
1788 static void transport_generic_request_failure(struct se_cmd *cmd)
1789 {
1790         int ret = 0;
1791
1792         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1793                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1794                 cmd->t_task_cdb[0]);
1795         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1796                 cmd->se_tfo->get_cmd_state(cmd),
1797                 cmd->t_state, cmd->scsi_sense_reason);
1798         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1799                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1800                 " t_transport_active: %d t_transport_stop: %d"
1801                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1802                 atomic_read(&cmd->t_task_cdbs_left),
1803                 atomic_read(&cmd->t_task_cdbs_sent),
1804                 atomic_read(&cmd->t_task_cdbs_ex_left),
1805                 atomic_read(&cmd->t_transport_active),
1806                 atomic_read(&cmd->t_transport_stop),
1807                 atomic_read(&cmd->t_transport_sent));
1808
1809         /*
1810          * For SAM Task Attribute emulation for failed struct se_cmd
1811          */
1812         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1813                 transport_complete_task_attr(cmd);
1814
1815         switch (cmd->scsi_sense_reason) {
1816         case TCM_NON_EXISTENT_LUN:
1817         case TCM_UNSUPPORTED_SCSI_OPCODE:
1818         case TCM_INVALID_CDB_FIELD:
1819         case TCM_INVALID_PARAMETER_LIST:
1820         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1821         case TCM_UNKNOWN_MODE_PAGE:
1822         case TCM_WRITE_PROTECTED:
1823         case TCM_ADDRESS_OUT_OF_RANGE:
1824         case TCM_CHECK_CONDITION_ABORT_CMD:
1825         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1826         case TCM_CHECK_CONDITION_NOT_READY:
1827                 break;
1828         case TCM_RESERVATION_CONFLICT:
1829                 /*
1830                  * No SENSE Data payload for this case, set SCSI Status
1831                  * and queue the response to $FABRIC_MOD.
1832                  *
1833                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1834                  */
1835                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1836                 /*
1837                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1838                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1839                  * CONFLICT STATUS.
1840                  *
1841                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1842                  */
1843                 if (cmd->se_sess &&
1844                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1845                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1846                                 cmd->orig_fe_lun, 0x2C,
1847                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1848
1849                 ret = cmd->se_tfo->queue_status(cmd);
1850                 if (ret == -EAGAIN || ret == -ENOMEM)
1851                         goto queue_full;
1852                 goto check_stop;
1853         default:
1854                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1855                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1856                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1857                 break;
1858         }
1859         /*
1860          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1861          * make the call to transport_send_check_condition_and_sense()
1862          * directly.  Otherwise expect the fabric to make the call to
1863          * transport_send_check_condition_and_sense() after handling
1864          * possible unsoliticied write data payloads.
1865          */
1866         ret = transport_send_check_condition_and_sense(cmd,
1867                         cmd->scsi_sense_reason, 0);
1868         if (ret == -EAGAIN || ret == -ENOMEM)
1869                 goto queue_full;
1870
1871 check_stop:
1872         transport_lun_remove_cmd(cmd);
1873         if (!transport_cmd_check_stop_to_fabric(cmd))
1874                 ;
1875         return;
1876
1877 queue_full:
1878         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1879         transport_handle_queue_full(cmd, cmd->se_dev);
1880 }
1881
1882 static inline u32 transport_lba_21(unsigned char *cdb)
1883 {
1884         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1885 }
1886
1887 static inline u32 transport_lba_32(unsigned char *cdb)
1888 {
1889         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1890 }
1891
1892 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1893 {
1894         unsigned int __v1, __v2;
1895
1896         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1897         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1898
1899         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1900 }
1901
1902 /*
1903  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1904  */
1905 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1906 {
1907         unsigned int __v1, __v2;
1908
1909         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1910         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1911
1912         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1913 }
1914
1915 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1916 {
1917         unsigned long flags;
1918
1919         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1920         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1921         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1922 }
1923
1924 static inline int transport_tcq_window_closed(struct se_device *dev)
1925 {
1926         if (dev->dev_tcq_window_closed++ <
1927                         PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1928                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1929         } else
1930                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1931
1932         wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
1933         return 0;
1934 }
1935
1936 /*
1937  * Called from Fabric Module context from transport_execute_tasks()
1938  *
1939  * The return of this function determins if the tasks from struct se_cmd
1940  * get added to the execution queue in transport_execute_tasks(),
1941  * or are added to the delayed or ordered lists here.
1942  */
1943 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1944 {
1945         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1946                 return 1;
1947         /*
1948          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1949          * to allow the passed struct se_cmd list of tasks to the front of the list.
1950          */
1951          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1952                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1953                         " 0x%02x, se_ordered_id: %u\n",
1954                         cmd->t_task_cdb[0],
1955                         cmd->se_ordered_id);
1956                 return 1;
1957         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1958                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1959                 smp_mb__after_atomic_inc();
1960
1961                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1962                                 " list, se_ordered_id: %u\n",
1963                                 cmd->t_task_cdb[0],
1964                                 cmd->se_ordered_id);
1965                 /*
1966                  * Add ORDERED command to tail of execution queue if
1967                  * no other older commands exist that need to be
1968                  * completed first.
1969                  */
1970                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1971                         return 1;
1972         } else {
1973                 /*
1974                  * For SIMPLE and UNTAGGED Task Attribute commands
1975                  */
1976                 atomic_inc(&cmd->se_dev->simple_cmds);
1977                 smp_mb__after_atomic_inc();
1978         }
1979         /*
1980          * Otherwise if one or more outstanding ORDERED task attribute exist,
1981          * add the dormant task(s) built for the passed struct se_cmd to the
1982          * execution queue and become in Active state for this struct se_device.
1983          */
1984         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1985                 /*
1986                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1987                  * will be drained upon completion of HEAD_OF_QUEUE task.
1988                  */
1989                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1990                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1991                 list_add_tail(&cmd->se_delayed_node,
1992                                 &cmd->se_dev->delayed_cmd_list);
1993                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1994
1995                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1996                         " delayed CMD list, se_ordered_id: %u\n",
1997                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1998                         cmd->se_ordered_id);
1999                 /*
2000                  * Return zero to let transport_execute_tasks() know
2001                  * not to add the delayed tasks to the execution list.
2002                  */
2003                 return 0;
2004         }
2005         /*
2006          * Otherwise, no ORDERED task attributes exist..
2007          */
2008         return 1;
2009 }
2010
2011 /*
2012  * Called from fabric module context in transport_generic_new_cmd() and
2013  * transport_generic_process_write()
2014  */
2015 static int transport_execute_tasks(struct se_cmd *cmd)
2016 {
2017         int add_tasks;
2018
2019         if (se_dev_check_online(cmd->se_dev) != 0) {
2020                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2021                 transport_generic_request_failure(cmd);
2022                 return 0;
2023         }
2024
2025         /*
2026          * Call transport_cmd_check_stop() to see if a fabric exception
2027          * has occurred that prevents execution.
2028          */
2029         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2030                 /*
2031                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2032                  * attribute for the tasks of the received struct se_cmd CDB
2033                  */
2034                 add_tasks = transport_execute_task_attr(cmd);
2035                 if (!add_tasks)
2036                         goto execute_tasks;
2037                 /*
2038                  * This calls transport_add_tasks_from_cmd() to handle
2039                  * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2040                  * (if enabled) in __transport_add_task_to_execute_queue() and
2041                  * transport_add_task_check_sam_attr().
2042                  */
2043                 transport_add_tasks_from_cmd(cmd);
2044         }
2045         /*
2046          * Kick the execution queue for the cmd associated struct se_device
2047          * storage object.
2048          */
2049 execute_tasks:
2050         __transport_execute_tasks(cmd->se_dev);
2051         return 0;
2052 }
2053
2054 /*
2055  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2056  * from struct se_device->execute_task_list and
2057  *
2058  * Called from transport_processing_thread()
2059  */
2060 static int __transport_execute_tasks(struct se_device *dev)
2061 {
2062         int error;
2063         struct se_cmd *cmd = NULL;
2064         struct se_task *task = NULL;
2065         unsigned long flags;
2066
2067         /*
2068          * Check if there is enough room in the device and HBA queue to send
2069          * struct se_tasks to the selected transport.
2070          */
2071 check_depth:
2072         if (!atomic_read(&dev->depth_left))
2073                 return transport_tcq_window_closed(dev);
2074
2075         dev->dev_tcq_window_closed = 0;
2076
2077         spin_lock_irq(&dev->execute_task_lock);
2078         if (list_empty(&dev->execute_task_list)) {
2079                 spin_unlock_irq(&dev->execute_task_lock);
2080                 return 0;
2081         }
2082         task = list_first_entry(&dev->execute_task_list,
2083                                 struct se_task, t_execute_list);
2084         __transport_remove_task_from_execute_queue(task, dev);
2085         spin_unlock_irq(&dev->execute_task_lock);
2086
2087         atomic_dec(&dev->depth_left);
2088
2089         cmd = task->task_se_cmd;
2090
2091         spin_lock_irqsave(&cmd->t_state_lock, flags);
2092         task->task_flags |= (TF_ACTIVE | TF_SENT);
2093         atomic_inc(&cmd->t_task_cdbs_sent);
2094
2095         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2096             cmd->t_task_list_num)
2097                 atomic_set(&cmd->t_transport_sent, 1);
2098
2099         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2100
2101         if (cmd->execute_task)
2102                 error = cmd->execute_task(task);
2103         else
2104                 error = dev->transport->do_task(task);
2105         if (error != 0) {
2106                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2107                 task->task_flags &= ~TF_ACTIVE;
2108                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2109                 atomic_set(&cmd->t_transport_sent, 0);
2110                 transport_stop_tasks_for_cmd(cmd);
2111                 atomic_inc(&dev->depth_left);
2112                 transport_generic_request_failure(cmd);
2113         }
2114
2115         goto check_depth;
2116
2117         return 0;
2118 }
2119
2120 static inline u32 transport_get_sectors_6(
2121         unsigned char *cdb,
2122         struct se_cmd *cmd,
2123         int *ret)
2124 {
2125         struct se_device *dev = cmd->se_dev;
2126
2127         /*
2128          * Assume TYPE_DISK for non struct se_device objects.
2129          * Use 8-bit sector value.
2130          */
2131         if (!dev)
2132                 goto type_disk;
2133
2134         /*
2135          * Use 24-bit allocation length for TYPE_TAPE.
2136          */
2137         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2138                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2139
2140         /*
2141          * Everything else assume TYPE_DISK Sector CDB location.
2142          * Use 8-bit sector value.  SBC-3 says:
2143          *
2144          *   A TRANSFER LENGTH field set to zero specifies that 256
2145          *   logical blocks shall be written.  Any other value
2146          *   specifies the number of logical blocks that shall be
2147          *   written.
2148          */
2149 type_disk:
2150         return cdb[4] ? : 256;
2151 }
2152
2153 static inline u32 transport_get_sectors_10(
2154         unsigned char *cdb,
2155         struct se_cmd *cmd,
2156         int *ret)
2157 {
2158         struct se_device *dev = cmd->se_dev;
2159
2160         /*
2161          * Assume TYPE_DISK for non struct se_device objects.
2162          * Use 16-bit sector value.
2163          */
2164         if (!dev)
2165                 goto type_disk;
2166
2167         /*
2168          * XXX_10 is not defined in SSC, throw an exception
2169          */
2170         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2171                 *ret = -EINVAL;
2172                 return 0;
2173         }
2174
2175         /*
2176          * Everything else assume TYPE_DISK Sector CDB location.
2177          * Use 16-bit sector value.
2178          */
2179 type_disk:
2180         return (u32)(cdb[7] << 8) + cdb[8];
2181 }
2182
2183 static inline u32 transport_get_sectors_12(
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 32-bit sector value.
2193          */
2194         if (!dev)
2195                 goto type_disk;
2196
2197         /*
2198          * XXX_12 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 32-bit sector value.
2208          */
2209 type_disk:
2210         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2211 }
2212
2213 static inline u32 transport_get_sectors_16(
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          * Use 24-bit allocation length for TYPE_TAPE.
2229          */
2230         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2231                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2232
2233 type_disk:
2234         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2235                     (cdb[12] << 8) + cdb[13];
2236 }
2237
2238 /*
2239  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2240  */
2241 static inline u32 transport_get_sectors_32(
2242         unsigned char *cdb,
2243         struct se_cmd *cmd,
2244         int *ret)
2245 {
2246         /*
2247          * Assume TYPE_DISK for non struct se_device objects.
2248          * Use 32-bit sector value.
2249          */
2250         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2251                     (cdb[30] << 8) + cdb[31];
2252
2253 }
2254
2255 static inline u32 transport_get_size(
2256         u32 sectors,
2257         unsigned char *cdb,
2258         struct se_cmd *cmd)
2259 {
2260         struct se_device *dev = cmd->se_dev;
2261
2262         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2263                 if (cdb[1] & 1) { /* sectors */
2264                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2265                 } else /* bytes */
2266                         return sectors;
2267         }
2268 #if 0
2269         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2270                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2271                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2272                         dev->transport->name);
2273 #endif
2274         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2275 }
2276
2277 static void transport_xor_callback(struct se_cmd *cmd)
2278 {
2279         unsigned char *buf, *addr;
2280         struct scatterlist *sg;
2281         unsigned int offset;
2282         int i;
2283         int count;
2284         /*
2285          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2286          *
2287          * 1) read the specified logical block(s);
2288          * 2) transfer logical blocks from the data-out buffer;
2289          * 3) XOR the logical blocks transferred from the data-out buffer with
2290          *    the logical blocks read, storing the resulting XOR data in a buffer;
2291          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2292          *    blocks transferred from the data-out buffer; and
2293          * 5) transfer the resulting XOR data to the data-in buffer.
2294          */
2295         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2296         if (!buf) {
2297                 pr_err("Unable to allocate xor_callback buf\n");
2298                 return;
2299         }
2300         /*
2301          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2302          * into the locally allocated *buf
2303          */
2304         sg_copy_to_buffer(cmd->t_data_sg,
2305                           cmd->t_data_nents,
2306                           buf,
2307                           cmd->data_length);
2308
2309         /*
2310          * Now perform the XOR against the BIDI read memory located at
2311          * cmd->t_mem_bidi_list
2312          */
2313
2314         offset = 0;
2315         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2316                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2317                 if (!addr)
2318                         goto out;
2319
2320                 for (i = 0; i < sg->length; i++)
2321                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2322
2323                 offset += sg->length;
2324                 kunmap_atomic(addr, KM_USER0);
2325         }
2326
2327 out:
2328         kfree(buf);
2329 }
2330
2331 /*
2332  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2333  */
2334 static int transport_get_sense_data(struct se_cmd *cmd)
2335 {
2336         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2337         struct se_device *dev = cmd->se_dev;
2338         struct se_task *task = NULL, *task_tmp;
2339         unsigned long flags;
2340         u32 offset = 0;
2341
2342         WARN_ON(!cmd->se_lun);
2343
2344         if (!dev)
2345                 return 0;
2346
2347         spin_lock_irqsave(&cmd->t_state_lock, flags);
2348         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2349                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2350                 return 0;
2351         }
2352
2353         list_for_each_entry_safe(task, task_tmp,
2354                                 &cmd->t_task_list, t_list) {
2355                 if (!task->task_sense)
2356                         continue;
2357
2358                 if (!dev->transport->get_sense_buffer) {
2359                         pr_err("dev->transport->get_sense_buffer"
2360                                         " is NULL\n");
2361                         continue;
2362                 }
2363
2364                 sense_buffer = dev->transport->get_sense_buffer(task);
2365                 if (!sense_buffer) {
2366                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2367                                 " sense buffer for task with sense\n",
2368                                 cmd->se_tfo->get_task_tag(cmd), task);
2369                         continue;
2370                 }
2371                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2372
2373                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2374                                 TRANSPORT_SENSE_BUFFER);
2375
2376                 memcpy(&buffer[offset], sense_buffer,
2377                                 TRANSPORT_SENSE_BUFFER);
2378                 cmd->scsi_status = task->task_scsi_status;
2379                 /* Automatically padded */
2380                 cmd->scsi_sense_length =
2381                                 (TRANSPORT_SENSE_BUFFER + offset);
2382
2383                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2384                                 " and sense\n",
2385                         dev->se_hba->hba_id, dev->transport->name,
2386                                 cmd->scsi_status);
2387                 return 0;
2388         }
2389         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2390
2391         return -1;
2392 }
2393
2394 static inline long long transport_dev_end_lba(struct se_device *dev)
2395 {
2396         return dev->transport->get_blocks(dev) + 1;
2397 }
2398
2399 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2400 {
2401         struct se_device *dev = cmd->se_dev;
2402         u32 sectors;
2403
2404         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2405                 return 0;
2406
2407         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2408
2409         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2410                 pr_err("LBA: %llu Sectors: %u exceeds"
2411                         " transport_dev_end_lba(): %llu\n",
2412                         cmd->t_task_lba, sectors,
2413                         transport_dev_end_lba(dev));
2414                 return -EINVAL;
2415         }
2416
2417         return 0;
2418 }
2419
2420 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2421 {
2422         /*
2423          * Determine if the received WRITE_SAME is used to for direct
2424          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2425          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2426          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2427          */
2428         int passthrough = (dev->transport->transport_type ==
2429                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2430
2431         if (!passthrough) {
2432                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2433                         pr_err("WRITE_SAME PBDATA and LBDATA"
2434                                 " bits not supported for Block Discard"
2435                                 " Emulation\n");
2436                         return -ENOSYS;
2437                 }
2438                 /*
2439                  * Currently for the emulated case we only accept
2440                  * tpws with the UNMAP=1 bit set.
2441                  */
2442                 if (!(flags[0] & 0x08)) {
2443                         pr_err("WRITE_SAME w/o UNMAP bit not"
2444                                 " supported for Block Discard Emulation\n");
2445                         return -ENOSYS;
2446                 }
2447         }
2448
2449         return 0;
2450 }
2451
2452 /*      transport_generic_cmd_sequencer():
2453  *
2454  *      Generic Command Sequencer that should work for most DAS transport
2455  *      drivers.
2456  *
2457  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2458  *      RX Thread.
2459  *
2460  *      FIXME: Need to support other SCSI OPCODES where as well.
2461  */
2462 static int transport_generic_cmd_sequencer(
2463         struct se_cmd *cmd,
2464         unsigned char *cdb)
2465 {
2466         struct se_device *dev = cmd->se_dev;
2467         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2468         int ret = 0, sector_ret = 0, passthrough;
2469         u32 sectors = 0, size = 0, pr_reg_type = 0;
2470         u16 service_action;
2471         u8 alua_ascq = 0;
2472         /*
2473          * Check for an existing UNIT ATTENTION condition
2474          */
2475         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2476                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2477                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2478                 return -EINVAL;
2479         }
2480         /*
2481          * Check status of Asymmetric Logical Unit Assignment port
2482          */
2483         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2484         if (ret != 0) {
2485                 /*
2486                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2487                  * The ALUA additional sense code qualifier (ASCQ) is determined
2488                  * by the ALUA primary or secondary access state..
2489                  */
2490                 if (ret > 0) {
2491 #if 0
2492                         pr_debug("[%s]: ALUA TG Port not available,"
2493                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2494                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2495 #endif
2496                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2497                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2498                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2499                         return -EINVAL;
2500                 }
2501                 goto out_invalid_cdb_field;
2502         }
2503         /*
2504          * Check status for SPC-3 Persistent Reservations
2505          */
2506         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2507                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2508                                         cmd, cdb, pr_reg_type) != 0) {
2509                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2510                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2511                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2512                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2513                         return -EBUSY;
2514                 }
2515                 /*
2516                  * This means the CDB is allowed for the SCSI Initiator port
2517                  * when said port is *NOT* holding the legacy SPC-2 or
2518                  * SPC-3 Persistent Reservation.
2519                  */
2520         }
2521
2522         /*
2523          * If we operate in passthrough mode we skip most CDB emulation and
2524          * instead hand the commands down to the physical SCSI device.
2525          */
2526         passthrough =
2527                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2528
2529         switch (cdb[0]) {
2530         case READ_6:
2531                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2532                 if (sector_ret)
2533                         goto out_unsupported_cdb;
2534                 size = transport_get_size(sectors, cdb, cmd);
2535                 cmd->t_task_lba = transport_lba_21(cdb);
2536                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2537                 break;
2538         case READ_10:
2539                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2540                 if (sector_ret)
2541                         goto out_unsupported_cdb;
2542                 size = transport_get_size(sectors, cdb, cmd);
2543                 cmd->t_task_lba = transport_lba_32(cdb);
2544                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2545                 break;
2546         case READ_12:
2547                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2548                 if (sector_ret)
2549                         goto out_unsupported_cdb;
2550                 size = transport_get_size(sectors, cdb, cmd);
2551                 cmd->t_task_lba = transport_lba_32(cdb);
2552                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2553                 break;
2554         case READ_16:
2555                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2556                 if (sector_ret)
2557                         goto out_unsupported_cdb;
2558                 size = transport_get_size(sectors, cdb, cmd);
2559                 cmd->t_task_lba = transport_lba_64(cdb);
2560                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2561                 break;
2562         case WRITE_6:
2563                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2564                 if (sector_ret)
2565                         goto out_unsupported_cdb;
2566                 size = transport_get_size(sectors, cdb, cmd);
2567                 cmd->t_task_lba = transport_lba_21(cdb);
2568                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2569                 break;
2570         case WRITE_10:
2571                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2572                 if (sector_ret)
2573                         goto out_unsupported_cdb;
2574                 size = transport_get_size(sectors, cdb, cmd);
2575                 cmd->t_task_lba = transport_lba_32(cdb);
2576                 if (cdb[1] & 0x8)
2577                         cmd->se_cmd_flags |= SCF_FUA;
2578                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2579                 break;
2580         case WRITE_12:
2581                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2582                 if (sector_ret)
2583                         goto out_unsupported_cdb;
2584                 size = transport_get_size(sectors, cdb, cmd);
2585                 cmd->t_task_lba = transport_lba_32(cdb);
2586                 if (cdb[1] & 0x8)
2587                         cmd->se_cmd_flags |= SCF_FUA;
2588                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2589                 break;
2590         case WRITE_16:
2591                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2592                 if (sector_ret)
2593                         goto out_unsupported_cdb;
2594                 size = transport_get_size(sectors, cdb, cmd);
2595                 cmd->t_task_lba = transport_lba_64(cdb);
2596                 if (cdb[1] & 0x8)
2597                         cmd->se_cmd_flags |= SCF_FUA;
2598                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2599                 break;
2600         case XDWRITEREAD_10:
2601                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2602                     !(cmd->se_cmd_flags & SCF_BIDI))
2603                         goto out_invalid_cdb_field;
2604                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2605                 if (sector_ret)
2606                         goto out_unsupported_cdb;
2607                 size = transport_get_size(sectors, cdb, cmd);
2608                 cmd->t_task_lba = transport_lba_32(cdb);
2609                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2610
2611                 /*
2612                  * Do now allow BIDI commands for passthrough mode.
2613                  */
2614                 if (passthrough)
2615                         goto out_unsupported_cdb;
2616
2617                 /*
2618                  * Setup BIDI XOR callback to be run after I/O completion.
2619                  */
2620                 cmd->transport_complete_callback = &transport_xor_callback;
2621                 if (cdb[1] & 0x8)
2622                         cmd->se_cmd_flags |= SCF_FUA;
2623                 break;
2624         case VARIABLE_LENGTH_CMD:
2625                 service_action = get_unaligned_be16(&cdb[8]);
2626                 switch (service_action) {
2627                 case XDWRITEREAD_32:
2628                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2629                         if (sector_ret)
2630                                 goto out_unsupported_cdb;
2631                         size = transport_get_size(sectors, cdb, cmd);
2632                         /*
2633                          * Use WRITE_32 and READ_32 opcodes for the emulated
2634                          * XDWRITE_READ_32 logic.
2635                          */
2636                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2637                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2638
2639                         /*
2640                          * Do now allow BIDI commands for passthrough mode.
2641                          */
2642                         if (passthrough)
2643                                 goto out_unsupported_cdb;
2644
2645                         /*
2646                          * Setup BIDI XOR callback to be run during after I/O
2647                          * 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 WRITE_SAME_32:
2654                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2655                         if (sector_ret)
2656                                 goto out_unsupported_cdb;
2657
2658                         if (sectors)
2659                                 size = transport_get_size(1, cdb, cmd);
2660                         else {
2661                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2662                                        " supported\n");
2663                                 goto out_invalid_cdb_field;
2664                         }
2665
2666                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2667                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2668
2669                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2670                                 goto out_unsupported_cdb;
2671                         if (!passthrough)
2672                                 cmd->execute_task = target_emulate_write_same;
2673                         break;
2674                 default:
2675                         pr_err("VARIABLE_LENGTH_CMD service action"
2676                                 " 0x%04x not supported\n", service_action);
2677                         goto out_unsupported_cdb;
2678                 }
2679                 break;
2680         case MAINTENANCE_IN:
2681                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2682                         /* MAINTENANCE_IN from SCC-2 */
2683                         /*
2684                          * Check for emulated MI_REPORT_TARGET_PGS.
2685                          */
2686                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2687                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2688                                 cmd->execute_task =
2689                                         target_emulate_report_target_port_groups;
2690                         }
2691                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2692                                (cdb[8] << 8) | cdb[9];
2693                 } else {
2694                         /* GPCMD_SEND_KEY from multi media commands */
2695                         size = (cdb[8] << 8) + cdb[9];
2696                 }
2697                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2698                 break;
2699         case MODE_SELECT:
2700                 size = cdb[4];
2701                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702                 break;
2703         case MODE_SELECT_10:
2704                 size = (cdb[7] << 8) + cdb[8];
2705                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2706                 break;
2707         case MODE_SENSE:
2708                 size = cdb[4];
2709                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2710                 if (!passthrough)
2711                         cmd->execute_task = target_emulate_modesense;
2712                 break;
2713         case MODE_SENSE_10:
2714                 size = (cdb[7] << 8) + cdb[8];
2715                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2716                 if (!passthrough)
2717                         cmd->execute_task = target_emulate_modesense;
2718                 break;
2719         case GPCMD_READ_BUFFER_CAPACITY:
2720         case GPCMD_SEND_OPC:
2721         case LOG_SELECT:
2722         case LOG_SENSE:
2723                 size = (cdb[7] << 8) + cdb[8];
2724                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2725                 break;
2726         case READ_BLOCK_LIMITS:
2727                 size = READ_BLOCK_LEN;
2728                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2729                 break;
2730         case GPCMD_GET_CONFIGURATION:
2731         case GPCMD_READ_FORMAT_CAPACITIES:
2732         case GPCMD_READ_DISC_INFO:
2733         case GPCMD_READ_TRACK_RZONE_INFO:
2734                 size = (cdb[7] << 8) + cdb[8];
2735                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2736                 break;
2737         case PERSISTENT_RESERVE_IN:
2738                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2739                         cmd->execute_task = target_scsi3_emulate_pr_in;
2740                 size = (cdb[7] << 8) + cdb[8];
2741                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2742                 break;
2743         case PERSISTENT_RESERVE_OUT:
2744                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2745                         cmd->execute_task = target_scsi3_emulate_pr_out;
2746                 size = (cdb[7] << 8) + cdb[8];
2747                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2748                 break;
2749         case GPCMD_MECHANISM_STATUS:
2750         case GPCMD_READ_DVD_STRUCTURE:
2751                 size = (cdb[8] << 8) + cdb[9];
2752                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2753                 break;
2754         case READ_POSITION:
2755                 size = READ_POSITION_LEN;
2756                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2757                 break;
2758         case MAINTENANCE_OUT:
2759                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2760                         /* MAINTENANCE_OUT from SCC-2
2761                          *
2762                          * Check for emulated MO_SET_TARGET_PGS.
2763                          */
2764                         if (cdb[1] == MO_SET_TARGET_PGS &&
2765                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2766                                 cmd->execute_task =
2767                                         target_emulate_set_target_port_groups;
2768                         }
2769
2770                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2771                                (cdb[8] << 8) | cdb[9];
2772                 } else  {
2773                         /* GPCMD_REPORT_KEY from multi media commands */
2774                         size = (cdb[8] << 8) + cdb[9];
2775                 }
2776                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2777                 break;
2778         case INQUIRY:
2779                 size = (cdb[3] << 8) + cdb[4];
2780                 /*
2781                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2782                  * See spc4r17 section 5.3
2783                  */
2784                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2785                         cmd->sam_task_attr = MSG_HEAD_TAG;
2786                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2787                 if (!passthrough)
2788                         cmd->execute_task = target_emulate_inquiry;
2789                 break;
2790         case READ_BUFFER:
2791                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2792                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2793                 break;
2794         case READ_CAPACITY:
2795                 size = READ_CAP_LEN;
2796                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2797                 if (!passthrough)
2798                         cmd->execute_task = target_emulate_readcapacity;
2799                 break;
2800         case READ_MEDIA_SERIAL_NUMBER:
2801         case SECURITY_PROTOCOL_IN:
2802         case SECURITY_PROTOCOL_OUT:
2803                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2804                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2805                 break;
2806         case SERVICE_ACTION_IN:
2807                 switch (cmd->t_task_cdb[1] & 0x1f) {
2808                 case SAI_READ_CAPACITY_16:
2809                         if (!passthrough)
2810                                 cmd->execute_task =
2811                                         target_emulate_readcapacity_16;
2812                         break;
2813                 default:
2814                         if (passthrough)
2815                                 break;
2816
2817                         pr_err("Unsupported SA: 0x%02x\n",
2818                                 cmd->t_task_cdb[1] & 0x1f);
2819                         goto out_unsupported_cdb;
2820                 }
2821                 /*FALLTHROUGH*/
2822         case ACCESS_CONTROL_IN:
2823         case ACCESS_CONTROL_OUT:
2824         case EXTENDED_COPY:
2825         case READ_ATTRIBUTE:
2826         case RECEIVE_COPY_RESULTS:
2827         case WRITE_ATTRIBUTE:
2828                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2829                        (cdb[12] << 8) | cdb[13];
2830                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2831                 break;
2832         case RECEIVE_DIAGNOSTIC:
2833         case SEND_DIAGNOSTIC:
2834                 size = (cdb[3] << 8) | cdb[4];
2835                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2836                 break;
2837 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2838 #if 0
2839         case GPCMD_READ_CD:
2840                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2841                 size = (2336 * sectors);
2842                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2843                 break;
2844 #endif
2845         case READ_TOC:
2846                 size = cdb[8];
2847                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2848                 break;
2849         case REQUEST_SENSE:
2850                 size = cdb[4];
2851                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2852                 if (!passthrough)
2853                         cmd->execute_task = target_emulate_request_sense;
2854                 break;
2855         case READ_ELEMENT_STATUS:
2856                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2857                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2858                 break;
2859         case WRITE_BUFFER:
2860                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2861                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2862                 break;
2863         case RESERVE:
2864         case RESERVE_10:
2865                 /*
2866                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2867                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2868                  */
2869                 if (cdb[0] == RESERVE_10)
2870                         size = (cdb[7] << 8) | cdb[8];
2871                 else
2872                         size = cmd->data_length;
2873
2874                 /*
2875                  * Setup the legacy emulated handler for SPC-2 and
2876                  * >= SPC-3 compatible reservation handling (CRH=1)
2877                  * Otherwise, we assume the underlying SCSI logic is
2878                  * is running in SPC_PASSTHROUGH, and wants reservations
2879                  * emulation disabled.
2880                  */
2881                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2882                         cmd->execute_task = target_scsi2_reservation_reserve;
2883                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2884                 break;
2885         case RELEASE:
2886         case RELEASE_10:
2887                 /*
2888                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2889                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2890                 */
2891                 if (cdb[0] == RELEASE_10)
2892                         size = (cdb[7] << 8) | cdb[8];
2893                 else
2894                         size = cmd->data_length;
2895
2896                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2897                         cmd->execute_task = target_scsi2_reservation_release;
2898                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2899                 break;
2900         case SYNCHRONIZE_CACHE:
2901         case 0x91: /* SYNCHRONIZE_CACHE_16: */
2902                 /*
2903                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2904                  */
2905                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2906                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2907                         cmd->t_task_lba = transport_lba_32(cdb);
2908                 } else {
2909                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2910                         cmd->t_task_lba = transport_lba_64(cdb);
2911                 }
2912                 if (sector_ret)
2913                         goto out_unsupported_cdb;
2914
2915                 size = transport_get_size(sectors, cdb, cmd);
2916                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2917
2918                 if (passthrough)
2919                         break;
2920
2921                 /*
2922                  * Check to ensure that LBA + Range does not exceed past end of
2923                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2924                  */
2925                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2926                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2927                                 goto out_invalid_cdb_field;
2928                 }
2929                 cmd->execute_task = target_emulate_synchronize_cache;
2930                 break;
2931         case UNMAP:
2932                 size = get_unaligned_be16(&cdb[7]);
2933                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2934                 if (!passthrough)
2935                         cmd->execute_task = target_emulate_unmap;
2936                 break;
2937         case WRITE_SAME_16:
2938                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2939                 if (sector_ret)
2940                         goto out_unsupported_cdb;
2941
2942                 if (sectors)
2943                         size = transport_get_size(1, cdb, cmd);
2944                 else {
2945                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2946                         goto out_invalid_cdb_field;
2947                 }
2948
2949                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2950                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2951
2952                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2953                         goto out_unsupported_cdb;
2954                 if (!passthrough)
2955                         cmd->execute_task = target_emulate_write_same;
2956                 break;
2957         case WRITE_SAME:
2958                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2959                 if (sector_ret)
2960                         goto out_unsupported_cdb;
2961
2962                 if (sectors)
2963                         size = transport_get_size(1, cdb, cmd);
2964                 else {
2965                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2966                         goto out_invalid_cdb_field;
2967                 }
2968
2969                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2970                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2971                 /*
2972                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2973                  * of byte 1 bit 3 UNMAP instead of original reserved field
2974                  */
2975                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2976                         goto out_unsupported_cdb;
2977                 if (!passthrough)
2978                         cmd->execute_task = target_emulate_write_same;
2979                 break;
2980         case ALLOW_MEDIUM_REMOVAL:
2981         case ERASE:
2982         case REZERO_UNIT:
2983         case SEEK_10:
2984         case SPACE:
2985         case START_STOP:
2986         case TEST_UNIT_READY:
2987         case VERIFY:
2988         case WRITE_FILEMARKS:
2989                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2990                 if (!passthrough)
2991                         cmd->execute_task = target_emulate_noop;
2992                 break;
2993         case GPCMD_CLOSE_TRACK:
2994         case INITIALIZE_ELEMENT_STATUS:
2995         case GPCMD_LOAD_UNLOAD:
2996         case GPCMD_SET_SPEED:
2997         case MOVE_MEDIUM:
2998                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2999                 break;
3000         case REPORT_LUNS:
3001                 cmd->execute_task = target_report_luns;
3002                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3003                 /*
3004                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3005                  * See spc4r17 section 5.3
3006                  */
3007                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3008                         cmd->sam_task_attr = MSG_HEAD_TAG;
3009                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3010                 break;
3011         default:
3012                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3013                         " 0x%02x, sending CHECK_CONDITION.\n",
3014                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3015                 goto out_unsupported_cdb;
3016         }
3017
3018         if (size != cmd->data_length) {
3019                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3020                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3021                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3022                                 cmd->data_length, size, cdb[0]);
3023
3024                 cmd->cmd_spdtl = size;
3025
3026                 if (cmd->data_direction == DMA_TO_DEVICE) {
3027                         pr_err("Rejecting underflow/overflow"
3028                                         " WRITE data\n");
3029                         goto out_invalid_cdb_field;
3030                 }
3031                 /*
3032                  * Reject READ_* or WRITE_* with overflow/underflow for
3033                  * type SCF_SCSI_DATA_SG_IO_CDB.
3034                  */
3035                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3036                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3037                                 " CDB on non 512-byte sector setup subsystem"
3038                                 " plugin: %s\n", dev->transport->name);
3039                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3040                         goto out_invalid_cdb_field;
3041                 }
3042
3043                 if (size > cmd->data_length) {
3044                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3045                         cmd->residual_count = (size - cmd->data_length);
3046                 } else {
3047                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3048                         cmd->residual_count = (cmd->data_length - size);
3049                 }
3050                 cmd->data_length = size;
3051         }
3052
3053         /* reject any command that we don't have a handler for */
3054         if (!(passthrough || cmd->execute_task ||
3055              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3056                 goto out_unsupported_cdb;
3057
3058         transport_set_supported_SAM_opcode(cmd);
3059         return ret;
3060
3061 out_unsupported_cdb:
3062         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3063         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3064         return -EINVAL;
3065 out_invalid_cdb_field:
3066         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3067         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3068         return -EINVAL;
3069 }
3070
3071 /*
3072  * Called from I/O completion to determine which dormant/delayed
3073  * and ordered cmds need to have their tasks added to the execution queue.
3074  */
3075 static void transport_complete_task_attr(struct se_cmd *cmd)
3076 {
3077         struct se_device *dev = cmd->se_dev;
3078         struct se_cmd *cmd_p, *cmd_tmp;
3079         int new_active_tasks = 0;
3080
3081         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3082                 atomic_dec(&dev->simple_cmds);
3083                 smp_mb__after_atomic_dec();
3084                 dev->dev_cur_ordered_id++;
3085                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3086                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3087                         cmd->se_ordered_id);
3088         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3089                 dev->dev_cur_ordered_id++;
3090                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3091                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3092                         cmd->se_ordered_id);
3093         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3094                 atomic_dec(&dev->dev_ordered_sync);
3095                 smp_mb__after_atomic_dec();
3096
3097                 dev->dev_cur_ordered_id++;
3098                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3099                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3100         }
3101         /*
3102          * Process all commands up to the last received
3103          * ORDERED task attribute which requires another blocking
3104          * boundary
3105          */
3106         spin_lock(&dev->delayed_cmd_lock);
3107         list_for_each_entry_safe(cmd_p, cmd_tmp,
3108                         &dev->delayed_cmd_list, se_delayed_node) {
3109
3110                 list_del(&cmd_p->se_delayed_node);
3111                 spin_unlock(&dev->delayed_cmd_lock);
3112
3113                 pr_debug("Calling add_tasks() for"
3114                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3115                         " Dormant -> Active, se_ordered_id: %u\n",
3116                         cmd_p->t_task_cdb[0],
3117                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3118
3119                 transport_add_tasks_from_cmd(cmd_p);
3120                 new_active_tasks++;
3121
3122                 spin_lock(&dev->delayed_cmd_lock);
3123                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3124                         break;
3125         }
3126         spin_unlock(&dev->delayed_cmd_lock);
3127         /*
3128          * If new tasks have become active, wake up the transport thread
3129          * to do the processing of the Active tasks.
3130          */
3131         if (new_active_tasks != 0)
3132                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3133 }
3134
3135 static void transport_complete_qf(struct se_cmd *cmd)
3136 {
3137         int ret = 0;
3138
3139         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3140                 transport_complete_task_attr(cmd);
3141
3142         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3143                 ret = cmd->se_tfo->queue_status(cmd);
3144                 if (ret)
3145                         goto out;
3146         }
3147
3148         switch (cmd->data_direction) {
3149         case DMA_FROM_DEVICE:
3150                 ret = cmd->se_tfo->queue_data_in(cmd);
3151                 break;
3152         case DMA_TO_DEVICE:
3153                 if (cmd->t_bidi_data_sg) {
3154                         ret = cmd->se_tfo->queue_data_in(cmd);
3155                         if (ret < 0)
3156                                 break;
3157                 }
3158                 /* Fall through for DMA_TO_DEVICE */
3159         case DMA_NONE:
3160                 ret = cmd->se_tfo->queue_status(cmd);
3161                 break;
3162         default:
3163                 break;
3164         }
3165
3166 out:
3167         if (ret < 0) {
3168                 transport_handle_queue_full(cmd, cmd->se_dev);
3169                 return;
3170         }
3171         transport_lun_remove_cmd(cmd);
3172         transport_cmd_check_stop_to_fabric(cmd);
3173 }
3174
3175 static void transport_handle_queue_full(
3176         struct se_cmd *cmd,
3177         struct se_device *dev)
3178 {
3179         spin_lock_irq(&dev->qf_cmd_lock);
3180         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3181         atomic_inc(&dev->dev_qf_count);
3182         smp_mb__after_atomic_inc();
3183         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3184
3185         schedule_work(&cmd->se_dev->qf_work_queue);
3186 }
3187
3188 static void target_complete_ok_work(struct work_struct *work)
3189 {
3190         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3191         int reason = 0, ret;
3192
3193         /*
3194          * Check if we need to move delayed/dormant tasks from cmds on the
3195          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3196          * Attribute.
3197          */
3198         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3199                 transport_complete_task_attr(cmd);
3200         /*
3201          * Check to schedule QUEUE_FULL work, or execute an existing
3202          * cmd->transport_qf_callback()
3203          */
3204         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3205                 schedule_work(&cmd->se_dev->qf_work_queue);
3206
3207         /*
3208          * Check if we need to retrieve a sense buffer from
3209          * the struct se_cmd in question.
3210          */
3211         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3212                 if (transport_get_sense_data(cmd) < 0)
3213                         reason = TCM_NON_EXISTENT_LUN;
3214
3215                 /*
3216                  * Only set when an struct se_task->task_scsi_status returned
3217                  * a non GOOD status.
3218                  */
3219                 if (cmd->scsi_status) {
3220                         ret = transport_send_check_condition_and_sense(
3221                                         cmd, reason, 1);
3222                         if (ret == -EAGAIN || ret == -ENOMEM)
3223                                 goto queue_full;
3224
3225                         transport_lun_remove_cmd(cmd);
3226                         transport_cmd_check_stop_to_fabric(cmd);
3227                         return;
3228                 }
3229         }
3230         /*
3231          * Check for a callback, used by amongst other things
3232          * XDWRITE_READ_10 emulation.
3233          */
3234         if (cmd->transport_complete_callback)
3235                 cmd->transport_complete_callback(cmd);
3236
3237         switch (cmd->data_direction) {
3238         case DMA_FROM_DEVICE:
3239                 spin_lock(&cmd->se_lun->lun_sep_lock);
3240                 if (cmd->se_lun->lun_sep) {
3241                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3242                                         cmd->data_length;
3243                 }
3244                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3245
3246                 ret = cmd->se_tfo->queue_data_in(cmd);
3247                 if (ret == -EAGAIN || ret == -ENOMEM)
3248                         goto queue_full;
3249                 break;
3250         case DMA_TO_DEVICE:
3251                 spin_lock(&cmd->se_lun->lun_sep_lock);
3252                 if (cmd->se_lun->lun_sep) {
3253                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3254                                 cmd->data_length;
3255                 }
3256                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3257                 /*
3258                  * Check if we need to send READ payload for BIDI-COMMAND
3259                  */
3260                 if (cmd->t_bidi_data_sg) {
3261                         spin_lock(&cmd->se_lun->lun_sep_lock);
3262                         if (cmd->se_lun->lun_sep) {
3263                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3264                                         cmd->data_length;
3265                         }
3266                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3267                         ret = cmd->se_tfo->queue_data_in(cmd);
3268                         if (ret == -EAGAIN || ret == -ENOMEM)
3269                                 goto queue_full;
3270                         break;
3271                 }
3272                 /* Fall through for DMA_TO_DEVICE */
3273         case DMA_NONE:
3274                 ret = cmd->se_tfo->queue_status(cmd);
3275                 if (ret == -EAGAIN || ret == -ENOMEM)
3276                         goto queue_full;
3277                 break;
3278         default:
3279                 break;
3280         }
3281
3282         transport_lun_remove_cmd(cmd);
3283         transport_cmd_check_stop_to_fabric(cmd);
3284         return;
3285
3286 queue_full:
3287         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3288                 " data_direction: %d\n", cmd, cmd->data_direction);
3289         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3290         transport_handle_queue_full(cmd, cmd->se_dev);
3291 }
3292
3293 static void transport_free_dev_tasks(struct se_cmd *cmd)
3294 {
3295         struct se_task *task, *task_tmp;
3296         unsigned long flags;
3297         LIST_HEAD(dispose_list);
3298
3299         spin_lock_irqsave(&cmd->t_state_lock, flags);
3300         list_for_each_entry_safe(task, task_tmp,
3301                                 &cmd->t_task_list, t_list) {
3302                 if (!(task->task_flags & TF_ACTIVE))
3303                         list_move_tail(&task->t_list, &dispose_list);
3304         }
3305         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3306
3307         while (!list_empty(&dispose_list)) {
3308                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3309
3310                 if (task->task_sg != cmd->t_data_sg &&
3311                     task->task_sg != cmd->t_bidi_data_sg)
3312                         kfree(task->task_sg);
3313
3314                 list_del(&task->t_list);
3315
3316                 cmd->se_dev->transport->free_task(task);
3317         }
3318 }
3319
3320 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3321 {
3322         struct scatterlist *sg;
3323         int count;
3324
3325         for_each_sg(sgl, sg, nents, count)
3326                 __free_page(sg_page(sg));
3327
3328         kfree(sgl);
3329 }
3330
3331 static inline void transport_free_pages(struct se_cmd *cmd)
3332 {
3333         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3334                 return;
3335
3336         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3337         cmd->t_data_sg = NULL;
3338         cmd->t_data_nents = 0;
3339
3340         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3341         cmd->t_bidi_data_sg = NULL;
3342         cmd->t_bidi_data_nents = 0;
3343 }
3344
3345 /**
3346  * transport_put_cmd - release a reference to a command
3347  * @cmd:       command to release
3348  *
3349  * This routine releases our reference to the command and frees it if possible.
3350  */
3351 static void transport_put_cmd(struct se_cmd *cmd)
3352 {
3353         unsigned long flags;
3354         int free_tasks = 0;
3355
3356         spin_lock_irqsave(&cmd->t_state_lock, flags);
3357         if (atomic_read(&cmd->t_fe_count)) {
3358                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3359                         goto out_busy;
3360         }
3361
3362         if (atomic_read(&cmd->t_se_count)) {
3363                 if (!atomic_dec_and_test(&cmd->t_se_count))
3364                         goto out_busy;
3365         }
3366
3367         if (atomic_read(&cmd->transport_dev_active)) {
3368                 atomic_set(&cmd->transport_dev_active, 0);
3369                 transport_all_task_dev_remove_state(cmd);
3370                 free_tasks = 1;
3371         }
3372         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3373
3374         if (free_tasks != 0)
3375                 transport_free_dev_tasks(cmd);
3376
3377         transport_free_pages(cmd);
3378         transport_release_cmd(cmd);
3379         return;
3380 out_busy:
3381         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3382 }
3383
3384 /*
3385  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3386  * allocating in the core.
3387  * @cmd:  Associated se_cmd descriptor
3388  * @mem:  SGL style memory for TCM WRITE / READ
3389  * @sg_mem_num: Number of SGL elements
3390  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3391  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3392  *
3393  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3394  * of parameters.
3395  */
3396 int transport_generic_map_mem_to_cmd(
3397         struct se_cmd *cmd,
3398         struct scatterlist *sgl,
3399         u32 sgl_count,
3400         struct scatterlist *sgl_bidi,
3401         u32 sgl_bidi_count)
3402 {
3403         if (!sgl || !sgl_count)
3404                 return 0;
3405
3406         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3407             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3408                 /*
3409                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3410                  * scatterlists already have been set to follow what the fabric
3411                  * passes for the original expected data transfer length.
3412                  */
3413                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3414                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3415                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3416                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3417                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3418                         return -EINVAL;
3419                 }
3420
3421                 cmd->t_data_sg = sgl;
3422                 cmd->t_data_nents = sgl_count;
3423
3424                 if (sgl_bidi && sgl_bidi_count) {
3425                         cmd->t_bidi_data_sg = sgl_bidi;
3426                         cmd->t_bidi_data_nents = sgl_bidi_count;
3427                 }
3428                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3429         }
3430
3431         return 0;
3432 }
3433 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3434
3435 void *transport_kmap_data_sg(struct se_cmd *cmd)
3436 {
3437         struct scatterlist *sg = cmd->t_data_sg;
3438         struct page **pages;
3439         int i;
3440
3441         BUG_ON(!sg);
3442         /*
3443          * We need to take into account a possible offset here for fabrics like
3444          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3445          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3446          */
3447         if (!cmd->t_data_nents)
3448                 return NULL;
3449         else if (cmd->t_data_nents == 1)
3450                 return kmap(sg_page(sg)) + sg->offset;
3451
3452         /* >1 page. use vmap */
3453         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3454         if (!pages)
3455                 return NULL;
3456
3457         /* convert sg[] to pages[] */
3458         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3459                 pages[i] = sg_page(sg);
3460         }
3461
3462         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3463         kfree(pages);
3464         if (!cmd->t_data_vmap)
3465                 return NULL;
3466
3467         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3468 }
3469 EXPORT_SYMBOL(transport_kmap_data_sg);
3470
3471 void transport_kunmap_data_sg(struct se_cmd *cmd)
3472 {
3473         if (!cmd->t_data_nents)
3474                 return;
3475         else if (cmd->t_data_nents == 1)
3476                 kunmap(sg_page(cmd->t_data_sg));
3477
3478         vunmap(cmd->t_data_vmap);
3479         cmd->t_data_vmap = NULL;
3480 }
3481 EXPORT_SYMBOL(transport_kunmap_data_sg);
3482
3483 static int
3484 transport_generic_get_mem(struct se_cmd *cmd)
3485 {
3486         u32 length = cmd->data_length;
3487         unsigned int nents;
3488         struct page *page;
3489         int i = 0;
3490
3491         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3492         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3493         if (!cmd->t_data_sg)
3494                 return -ENOMEM;
3495
3496         cmd->t_data_nents = nents;
3497         sg_init_table(cmd->t_data_sg, nents);
3498
3499         while (length) {
3500                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3501                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3502                 if (!page)
3503                         goto out;
3504
3505                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3506                 length -= page_len;
3507                 i++;
3508         }
3509         return 0;
3510
3511 out:
3512         while (i > 0) {
3513                 i--;
3514                 __free_page(sg_page(&cmd->t_data_sg[i]));
3515         }
3516         kfree(cmd->t_data_sg);
3517         cmd->t_data_sg = NULL;
3518         return -ENOMEM;
3519 }
3520
3521 /* Reduce sectors if they are too long for the device */
3522 static inline sector_t transport_limit_task_sectors(
3523         struct se_device *dev,
3524         unsigned long long lba,
3525         sector_t sectors)
3526 {
3527         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3528
3529         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3530                 if ((lba + sectors) > transport_dev_end_lba(dev))
3531                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3532
3533         return sectors;
3534 }
3535
3536
3537 /*
3538  * This function can be used by HW target mode drivers to create a linked
3539  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3540  * This is intended to be called during the completion path by TCM Core
3541  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3542  */
3543 void transport_do_task_sg_chain(struct se_cmd *cmd)
3544 {
3545         struct scatterlist *sg_first = NULL;
3546         struct scatterlist *sg_prev = NULL;
3547         int sg_prev_nents = 0;
3548         struct scatterlist *sg;
3549         struct se_task *task;
3550         u32 chained_nents = 0;
3551         int i;
3552
3553         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3554
3555         /*
3556          * Walk the struct se_task list and setup scatterlist chains
3557          * for each contiguously allocated struct se_task->task_sg[].
3558          */
3559         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3560                 if (!task->task_sg)
3561                         continue;
3562
3563                 if (!sg_first) {
3564                         sg_first = task->task_sg;
3565                         chained_nents = task->task_sg_nents;
3566                 } else {
3567                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3568                         chained_nents += task->task_sg_nents;
3569                 }
3570                 /*
3571                  * For the padded tasks, use the extra SGL vector allocated
3572                  * in transport_allocate_data_tasks() for the sg_prev_nents
3573                  * offset into sg_chain() above.
3574                  *
3575                  * We do not need the padding for the last task (or a single
3576                  * task), but in that case we will never use the sg_prev_nents
3577                  * value below which would be incorrect.
3578                  */
3579                 sg_prev_nents = (task->task_sg_nents + 1);
3580                 sg_prev = task->task_sg;
3581         }
3582         /*
3583          * Setup the starting pointer and total t_tasks_sg_linked_no including
3584          * padding SGs for linking and to mark the end.
3585          */
3586         cmd->t_tasks_sg_chained = sg_first;
3587         cmd->t_tasks_sg_chained_no = chained_nents;
3588
3589         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3590                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3591                 cmd->t_tasks_sg_chained_no);
3592
3593         for_each_sg(cmd->t_tasks_sg_chained, sg,
3594                         cmd->t_tasks_sg_chained_no, i) {
3595
3596                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3597                         i, sg, sg_page(sg), sg->length, sg->offset);
3598                 if (sg_is_chain(sg))
3599                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3600                 if (sg_is_last(sg))
3601                         pr_debug("SG: %p sg_is_last=1\n", sg);
3602         }
3603 }
3604 EXPORT_SYMBOL(transport_do_task_sg_chain);
3605
3606 /*
3607  * Break up cmd into chunks transport can handle
3608  */
3609 static int
3610 transport_allocate_data_tasks(struct se_cmd *cmd,
3611         enum dma_data_direction data_direction,
3612         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3613 {
3614         struct se_device *dev = cmd->se_dev;
3615         int task_count, i;
3616         unsigned long long lba;
3617         sector_t sectors, dev_max_sectors;
3618         u32 sector_size;
3619
3620         if (transport_cmd_get_valid_sectors(cmd) < 0)
3621                 return -EINVAL;
3622
3623         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3624         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3625
3626         WARN_ON(cmd->data_length % sector_size);
3627
3628         lba = cmd->t_task_lba;
3629         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3630         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3631
3632         /*
3633          * If we need just a single task reuse the SG list in the command
3634          * and avoid a lot of work.
3635          */
3636         if (task_count == 1) {
3637                 struct se_task *task;
3638                 unsigned long flags;
3639
3640                 task = transport_generic_get_task(cmd, data_direction);
3641                 if (!task)
3642                         return -ENOMEM;
3643
3644                 task->task_sg = cmd_sg;
3645                 task->task_sg_nents = sgl_nents;
3646
3647                 task->task_lba = lba;
3648                 task->task_sectors = sectors;
3649                 task->task_size = task->task_sectors * sector_size;
3650
3651                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3652                 list_add_tail(&task->t_list, &cmd->t_task_list);
3653                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3654
3655                 return task_count;
3656         }
3657
3658         for (i = 0; i < task_count; i++) {
3659                 struct se_task *task;
3660                 unsigned int task_size, task_sg_nents_padded;
3661                 struct scatterlist *sg;
3662                 unsigned long flags;
3663                 int count;
3664
3665                 task = transport_generic_get_task(cmd, data_direction);
3666                 if (!task)
3667                         return -ENOMEM;
3668
3669                 task->task_lba = lba;
3670                 task->task_sectors = min(sectors, dev_max_sectors);
3671                 task->task_size = task->task_sectors * sector_size;
3672
3673                 /*
3674                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3675                  * in order to calculate the number per task SGL entries
3676                  */
3677                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3678                 /*
3679                  * Check if the fabric module driver is requesting that all
3680                  * struct se_task->task_sg[] be chained together..  If so,
3681                  * then allocate an extra padding SG entry for linking and
3682                  * marking the end of the chained SGL for every task except
3683                  * the last one for (task_count > 1) operation, or skipping
3684                  * the extra padding for the (task_count == 1) case.
3685                  */
3686                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3687                         task_sg_nents_padded = (task->task_sg_nents + 1);
3688                 } else
3689                         task_sg_nents_padded = task->task_sg_nents;
3690
3691                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3692                                         task_sg_nents_padded, GFP_KERNEL);
3693                 if (!task->task_sg) {
3694                         cmd->se_dev->transport->free_task(task);
3695                         return -ENOMEM;
3696                 }
3697
3698                 sg_init_table(task->task_sg, task_sg_nents_padded);
3699
3700                 task_size = task->task_size;
3701
3702                 /* Build new sgl, only up to task_size */
3703                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3704                         if (cmd_sg->length > task_size)
3705                                 break;
3706
3707                         *sg = *cmd_sg;
3708                         task_size -= cmd_sg->length;
3709                         cmd_sg = sg_next(cmd_sg);
3710                 }
3711
3712                 lba += task->task_sectors;
3713                 sectors -= task->task_sectors;
3714
3715                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3716                 list_add_tail(&task->t_list, &cmd->t_task_list);
3717                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3718         }
3719
3720         return task_count;
3721 }
3722
3723 static int
3724 transport_allocate_control_task(struct se_cmd *cmd)
3725 {
3726         struct se_task *task;
3727         unsigned long flags;
3728
3729         /* Workaround for handling zero-length control CDBs */
3730         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3731             !cmd->data_length)
3732                 return 0;
3733
3734         task = transport_generic_get_task(cmd, cmd->data_direction);
3735         if (!task)
3736                 return -ENOMEM;
3737
3738         task->task_sg = cmd->t_data_sg;
3739         task->task_size = cmd->data_length;
3740         task->task_sg_nents = cmd->t_data_nents;
3741
3742         spin_lock_irqsave(&cmd->t_state_lock, flags);
3743         list_add_tail(&task->t_list, &cmd->t_task_list);
3744         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3745
3746         /* Success! Return number of tasks allocated */
3747         return 1;
3748 }
3749
3750 /*
3751  * Allocate any required ressources to execute the command, and either place
3752  * it on the execution queue if possible.  For writes we might not have the
3753  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3754  */
3755 int transport_generic_new_cmd(struct se_cmd *cmd)
3756 {
3757         struct se_device *dev = cmd->se_dev;
3758         int task_cdbs, task_cdbs_bidi = 0;
3759         int set_counts = 1;
3760         int ret = 0;
3761
3762         /*
3763          * Determine is the TCM fabric module has already allocated physical
3764          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3765          * beforehand.
3766          */
3767         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3768             cmd->data_length) {
3769                 ret = transport_generic_get_mem(cmd);
3770                 if (ret < 0)
3771                         goto out_fail;
3772         }
3773
3774         /*
3775          * For BIDI command set up the read tasks first.
3776          */
3777         if (cmd->t_bidi_data_sg &&
3778             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3779                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3780
3781                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3782                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3783                                 cmd->t_bidi_data_nents);
3784                 if (task_cdbs_bidi <= 0)
3785                         goto out_fail;
3786
3787                 atomic_inc(&cmd->t_fe_count);
3788                 atomic_inc(&cmd->t_se_count);
3789                 set_counts = 0;
3790         }
3791
3792         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3793                 task_cdbs = transport_allocate_data_tasks(cmd,
3794                                         cmd->data_direction, cmd->t_data_sg,
3795                                         cmd->t_data_nents);
3796         } else {
3797                 task_cdbs = transport_allocate_control_task(cmd);
3798         }
3799
3800         if (task_cdbs < 0)
3801                 goto out_fail;
3802         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3803                 cmd->t_state = TRANSPORT_COMPLETE;
3804                 atomic_set(&cmd->t_transport_active, 1);
3805
3806                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3807                         u8 ua_asc = 0, ua_ascq = 0;
3808
3809                         core_scsi3_ua_clear_for_request_sense(cmd,
3810                                         &ua_asc, &ua_ascq);
3811                 }
3812
3813                 INIT_WORK(&cmd->work, target_complete_ok_work);
3814                 queue_work(target_completion_wq, &cmd->work);
3815                 return 0;
3816         }
3817
3818         if (set_counts) {
3819                 atomic_inc(&cmd->t_fe_count);
3820                 atomic_inc(&cmd->t_se_count);
3821         }
3822
3823         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3824         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3825         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3826
3827         /*
3828          * For WRITEs, let the fabric know its buffer is ready..
3829          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3830          * will be added to the struct se_device execution queue after its WRITE
3831          * data has arrived. (ie: It gets handled by the transport processing
3832          * thread a second time)
3833          */
3834         if (cmd->data_direction == DMA_TO_DEVICE) {
3835                 transport_add_tasks_to_state_queue(cmd);
3836                 return transport_generic_write_pending(cmd);
3837         }
3838         /*
3839          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3840          * to the execution queue.
3841          */
3842         transport_execute_tasks(cmd);
3843         return 0;
3844
3845 out_fail:
3846         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3847         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3848         return -EINVAL;
3849 }
3850 EXPORT_SYMBOL(transport_generic_new_cmd);
3851
3852 /*      transport_generic_process_write():
3853  *
3854  *
3855  */
3856 void transport_generic_process_write(struct se_cmd *cmd)
3857 {
3858         transport_execute_tasks(cmd);
3859 }
3860 EXPORT_SYMBOL(transport_generic_process_write);
3861
3862 static void transport_write_pending_qf(struct se_cmd *cmd)
3863 {
3864         int ret;
3865
3866         ret = cmd->se_tfo->write_pending(cmd);
3867         if (ret == -EAGAIN || ret == -ENOMEM) {
3868                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3869                          cmd);
3870                 transport_handle_queue_full(cmd, cmd->se_dev);
3871         }
3872 }
3873
3874 static int transport_generic_write_pending(struct se_cmd *cmd)
3875 {
3876         unsigned long flags;
3877         int ret;
3878
3879         spin_lock_irqsave(&cmd->t_state_lock, flags);
3880         cmd->t_state = TRANSPORT_WRITE_PENDING;
3881         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3882
3883         /*
3884          * Clear the se_cmd for WRITE_PENDING status in order to set
3885          * cmd->t_transport_active=0 so that transport_generic_handle_data
3886          * can be called from HW target mode interrupt code.  This is safe
3887          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3888          * because the se_cmd->se_lun pointer is not being cleared.
3889          */
3890         transport_cmd_check_stop(cmd, 1, 0);
3891
3892         /*
3893          * Call the fabric write_pending function here to let the
3894          * frontend know that WRITE buffers are ready.
3895          */
3896         ret = cmd->se_tfo->write_pending(cmd);
3897         if (ret == -EAGAIN || ret == -ENOMEM)
3898                 goto queue_full;
3899         else if (ret < 0)
3900                 return ret;
3901
3902         return 1;
3903
3904 queue_full:
3905         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3906         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3907         transport_handle_queue_full(cmd, cmd->se_dev);
3908         return 0;
3909 }
3910
3911 /**
3912  * transport_release_cmd - free a command
3913  * @cmd:       command to free
3914  *
3915  * This routine unconditionally frees a command, and reference counting
3916  * or list removal must be done in the caller.
3917  */
3918 void transport_release_cmd(struct se_cmd *cmd)
3919 {
3920         BUG_ON(!cmd->se_tfo);
3921
3922         if (cmd->se_tmr_req)
3923                 core_tmr_release_req(cmd->se_tmr_req);
3924         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3925                 kfree(cmd->t_task_cdb);
3926         /*
3927          * Check if target_wait_for_sess_cmds() is expecting to
3928          * release se_cmd directly here..
3929          */
3930         if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3931                 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3932                         return;
3933
3934         cmd->se_tfo->release_cmd(cmd);
3935 }
3936 EXPORT_SYMBOL(transport_release_cmd);
3937
3938 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3939 {
3940         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3941                 if (wait_for_tasks && cmd->se_tmr_req)
3942                          transport_wait_for_tasks(cmd);
3943
3944                 transport_release_cmd(cmd);
3945         } else {
3946                 if (wait_for_tasks)
3947                         transport_wait_for_tasks(cmd);
3948
3949                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3950
3951                 if (cmd->se_lun)
3952                         transport_lun_remove_cmd(cmd);
3953
3954                 transport_free_dev_tasks(cmd);
3955
3956                 transport_put_cmd(cmd);
3957         }
3958 }
3959 EXPORT_SYMBOL(transport_generic_free_cmd);
3960
3961 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3962  * @se_sess:    session to reference
3963  * @se_cmd:     command descriptor to add
3964  */
3965 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3966 {
3967         unsigned long flags;
3968
3969         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3970         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3971         se_cmd->check_release = 1;
3972         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3973 }
3974 EXPORT_SYMBOL(target_get_sess_cmd);
3975
3976 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
3977  * @se_sess:    session to reference
3978  * @se_cmd:     command descriptor to drop
3979  */
3980 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3981 {
3982         unsigned long flags;
3983
3984         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3985         if (list_empty(&se_cmd->se_cmd_list)) {
3986                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3987                 WARN_ON(1);
3988                 return 0;
3989         }
3990
3991         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3992                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3993                 complete(&se_cmd->cmd_wait_comp);
3994                 return 1;
3995         }
3996         list_del(&se_cmd->se_cmd_list);
3997         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3998
3999         return 0;
4000 }
4001 EXPORT_SYMBOL(target_put_sess_cmd);
4002
4003 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
4004  * @se_sess:    session to split
4005  */
4006 void target_splice_sess_cmd_list(struct se_session *se_sess)
4007 {
4008         struct se_cmd *se_cmd;
4009         unsigned long flags;
4010
4011         WARN_ON(!list_empty(&se_sess->sess_wait_list));
4012         INIT_LIST_HEAD(&se_sess->sess_wait_list);
4013
4014         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
4015         se_sess->sess_tearing_down = 1;
4016
4017         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
4018
4019         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
4020                 se_cmd->cmd_wait_set = 1;
4021
4022         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
4023 }
4024 EXPORT_SYMBOL(target_splice_sess_cmd_list);
4025
4026 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
4027  * @se_sess:    session to wait for active I/O
4028  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
4029  */
4030 void target_wait_for_sess_cmds(
4031         struct se_session *se_sess,
4032         int wait_for_tasks)
4033 {
4034         struct se_cmd *se_cmd, *tmp_cmd;
4035         bool rc = false;
4036
4037         list_for_each_entry_safe(se_cmd, tmp_cmd,
4038                                 &se_sess->sess_wait_list, se_cmd_list) {
4039                 list_del(&se_cmd->se_cmd_list);
4040
4041                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4042                         " %d\n", se_cmd, se_cmd->t_state,
4043                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4044
4045                 if (wait_for_tasks) {
4046                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4047                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4048                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4049
4050                         rc = transport_wait_for_tasks(se_cmd);
4051
4052                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4053                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4054                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4055                 }
4056
4057                 if (!rc) {
4058                         wait_for_completion(&se_cmd->cmd_wait_comp);
4059                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4060                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4061                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4062                 }
4063
4064                 se_cmd->se_tfo->release_cmd(se_cmd);
4065         }
4066 }
4067 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4068
4069 /*      transport_lun_wait_for_tasks():
4070  *
4071  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4072  *      an struct se_lun to be successfully shutdown.
4073  */
4074 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4075 {
4076         unsigned long flags;
4077         int ret;
4078         /*
4079          * If the frontend has already requested this struct se_cmd to
4080          * be stopped, we can safely ignore this struct se_cmd.
4081          */
4082         spin_lock_irqsave(&cmd->t_state_lock, flags);
4083         if (atomic_read(&cmd->t_transport_stop)) {
4084                 atomic_set(&cmd->transport_lun_stop, 0);
4085                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4086                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4087                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4088                 transport_cmd_check_stop(cmd, 1, 0);
4089                 return -EPERM;
4090         }
4091         atomic_set(&cmd->transport_lun_fe_stop, 1);
4092         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4093
4094         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4095
4096         ret = transport_stop_tasks_for_cmd(cmd);
4097
4098         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4099                         " %d\n", cmd, cmd->t_task_list_num, ret);
4100         if (!ret) {
4101                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4102                                 cmd->se_tfo->get_task_tag(cmd));
4103                 wait_for_completion(&cmd->transport_lun_stop_comp);
4104                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4105                                 cmd->se_tfo->get_task_tag(cmd));
4106         }
4107         transport_remove_cmd_from_queue(cmd);
4108
4109         return 0;
4110 }
4111
4112 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4113 {
4114         struct se_cmd *cmd = NULL;
4115         unsigned long lun_flags, cmd_flags;
4116         /*
4117          * Do exception processing and return CHECK_CONDITION status to the
4118          * Initiator Port.
4119          */
4120         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4121         while (!list_empty(&lun->lun_cmd_list)) {
4122                 cmd = list_first_entry(&lun->lun_cmd_list,
4123                        struct se_cmd, se_lun_node);
4124                 list_del(&cmd->se_lun_node);
4125
4126                 atomic_set(&cmd->transport_lun_active, 0);
4127                 /*
4128                  * This will notify iscsi_target_transport.c:
4129                  * transport_cmd_check_stop() that a LUN shutdown is in
4130                  * progress for the iscsi_cmd_t.
4131                  */
4132                 spin_lock(&cmd->t_state_lock);
4133                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4134                         "_lun_stop for  ITT: 0x%08x\n",
4135                         cmd->se_lun->unpacked_lun,
4136                         cmd->se_tfo->get_task_tag(cmd));
4137                 atomic_set(&cmd->transport_lun_stop, 1);
4138                 spin_unlock(&cmd->t_state_lock);
4139
4140                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4141
4142                 if (!cmd->se_lun) {
4143                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4144                                 cmd->se_tfo->get_task_tag(cmd),
4145                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4146                         BUG();
4147                 }
4148                 /*
4149                  * If the Storage engine still owns the iscsi_cmd_t, determine
4150                  * and/or stop its context.
4151                  */
4152                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4153                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4154                         cmd->se_tfo->get_task_tag(cmd));
4155
4156                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4157                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4158                         continue;
4159                 }
4160
4161                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4162                         "_wait_for_tasks(): SUCCESS\n",
4163                         cmd->se_lun->unpacked_lun,
4164                         cmd->se_tfo->get_task_tag(cmd));
4165
4166                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4167                 if (!atomic_read(&cmd->transport_dev_active)) {
4168                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4169                         goto check_cond;
4170                 }
4171                 atomic_set(&cmd->transport_dev_active, 0);
4172                 transport_all_task_dev_remove_state(cmd);
4173                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4174
4175                 transport_free_dev_tasks(cmd);
4176                 /*
4177                  * The Storage engine stopped this struct se_cmd before it was
4178                  * send to the fabric frontend for delivery back to the
4179                  * Initiator Node.  Return this SCSI CDB back with an
4180                  * CHECK_CONDITION status.
4181                  */
4182 check_cond:
4183                 transport_send_check_condition_and_sense(cmd,
4184                                 TCM_NON_EXISTENT_LUN, 0);
4185                 /*
4186                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4187                  * be released, notify the waiting thread now that LU has
4188                  * finished accessing it.
4189                  */
4190                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4191                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4192                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4193                                 " struct se_cmd: %p ITT: 0x%08x\n",
4194                                 lun->unpacked_lun,
4195                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4196
4197                         spin_unlock_irqrestore(&cmd->t_state_lock,
4198                                         cmd_flags);
4199                         transport_cmd_check_stop(cmd, 1, 0);
4200                         complete(&cmd->transport_lun_fe_stop_comp);
4201                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4202                         continue;
4203                 }
4204                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4205                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4206
4207                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4208                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4209         }
4210         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4211 }
4212
4213 static int transport_clear_lun_thread(void *p)
4214 {
4215         struct se_lun *lun = (struct se_lun *)p;
4216
4217         __transport_clear_lun_from_sessions(lun);
4218         complete(&lun->lun_shutdown_comp);
4219
4220         return 0;
4221 }
4222
4223 int transport_clear_lun_from_sessions(struct se_lun *lun)
4224 {
4225         struct task_struct *kt;
4226
4227         kt = kthread_run(transport_clear_lun_thread, lun,
4228                         "tcm_cl_%u", lun->unpacked_lun);
4229         if (IS_ERR(kt)) {
4230                 pr_err("Unable to start clear_lun thread\n");
4231                 return PTR_ERR(kt);
4232         }
4233         wait_for_completion(&lun->lun_shutdown_comp);
4234
4235         return 0;
4236 }
4237
4238 /**
4239  * transport_wait_for_tasks - wait for completion to occur
4240  * @cmd:        command to wait
4241  *
4242  * Called from frontend fabric context to wait for storage engine
4243  * to pause and/or release frontend generated struct se_cmd.
4244  */
4245 bool transport_wait_for_tasks(struct se_cmd *cmd)
4246 {
4247         unsigned long flags;
4248
4249         spin_lock_irqsave(&cmd->t_state_lock, flags);
4250         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4251                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4252                 return false;
4253         }
4254         /*
4255          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4256          * has been set in transport_set_supported_SAM_opcode().
4257          */
4258         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4259                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4260                 return false;
4261         }
4262         /*
4263          * If we are already stopped due to an external event (ie: LUN shutdown)
4264          * sleep until the connection can have the passed struct se_cmd back.
4265          * The cmd->transport_lun_stopped_sem will be upped by
4266          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4267          * has completed its operation on the struct se_cmd.
4268          */
4269         if (atomic_read(&cmd->transport_lun_stop)) {
4270
4271                 pr_debug("wait_for_tasks: Stopping"
4272                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4273                         "_stop_comp); for ITT: 0x%08x\n",
4274                         cmd->se_tfo->get_task_tag(cmd));
4275                 /*
4276                  * There is a special case for WRITES where a FE exception +
4277                  * LUN shutdown means ConfigFS context is still sleeping on
4278                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4279                  * We go ahead and up transport_lun_stop_comp just to be sure
4280                  * here.
4281                  */
4282                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4283                 complete(&cmd->transport_lun_stop_comp);
4284                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4285                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4286
4287                 transport_all_task_dev_remove_state(cmd);
4288                 /*
4289                  * At this point, the frontend who was the originator of this
4290                  * struct se_cmd, now owns the structure and can be released through
4291                  * normal means below.
4292                  */
4293                 pr_debug("wait_for_tasks: Stopped"
4294                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4295                         "stop_comp); for ITT: 0x%08x\n",
4296                         cmd->se_tfo->get_task_tag(cmd));
4297
4298                 atomic_set(&cmd->transport_lun_stop, 0);
4299         }
4300         if (!atomic_read(&cmd->t_transport_active) ||
4301              atomic_read(&cmd->t_transport_aborted)) {
4302                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4303                 return false;
4304         }
4305
4306         atomic_set(&cmd->t_transport_stop, 1);
4307
4308         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4309                 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4310                 cmd, cmd->se_tfo->get_task_tag(cmd),
4311                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4312
4313         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4314
4315         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4316
4317         wait_for_completion(&cmd->t_transport_stop_comp);
4318
4319         spin_lock_irqsave(&cmd->t_state_lock, flags);
4320         atomic_set(&cmd->t_transport_active, 0);
4321         atomic_set(&cmd->t_transport_stop, 0);
4322
4323         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4324                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4325                 cmd->se_tfo->get_task_tag(cmd));
4326
4327         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4328
4329         return true;
4330 }
4331 EXPORT_SYMBOL(transport_wait_for_tasks);
4332
4333 static int transport_get_sense_codes(
4334         struct se_cmd *cmd,
4335         u8 *asc,
4336         u8 *ascq)
4337 {
4338         *asc = cmd->scsi_asc;
4339         *ascq = cmd->scsi_ascq;
4340
4341         return 0;
4342 }
4343
4344 static int transport_set_sense_codes(
4345         struct se_cmd *cmd,
4346         u8 asc,
4347         u8 ascq)
4348 {
4349         cmd->scsi_asc = asc;
4350         cmd->scsi_ascq = ascq;
4351
4352         return 0;
4353 }
4354
4355 int transport_send_check_condition_and_sense(
4356         struct se_cmd *cmd,
4357         u8 reason,
4358         int from_transport)
4359 {
4360         unsigned char *buffer = cmd->sense_buffer;
4361         unsigned long flags;
4362         int offset;
4363         u8 asc = 0, ascq = 0;
4364
4365         spin_lock_irqsave(&cmd->t_state_lock, flags);
4366         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4367                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4368                 return 0;
4369         }
4370         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4371         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4372
4373         if (!reason && from_transport)
4374                 goto after_reason;
4375
4376         if (!from_transport)
4377                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4378         /*
4379          * Data Segment and SenseLength of the fabric response PDU.
4380          *
4381          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4382          * from include/scsi/scsi_cmnd.h
4383          */
4384         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4385                                 TRANSPORT_SENSE_BUFFER);
4386         /*
4387          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4388          * SENSE KEY values from include/scsi/scsi.h
4389          */
4390         switch (reason) {
4391         case TCM_NON_EXISTENT_LUN:
4392                 /* CURRENT ERROR */
4393                 buffer[offset] = 0x70;
4394                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4395                 /* ILLEGAL REQUEST */
4396                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4397                 /* LOGICAL UNIT NOT SUPPORTED */
4398                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4399                 break;
4400         case TCM_UNSUPPORTED_SCSI_OPCODE:
4401         case TCM_SECTOR_COUNT_TOO_MANY:
4402                 /* CURRENT ERROR */
4403                 buffer[offset] = 0x70;
4404                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4405                 /* ILLEGAL REQUEST */
4406                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4407                 /* INVALID COMMAND OPERATION CODE */
4408                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4409                 break;
4410         case TCM_UNKNOWN_MODE_PAGE:
4411                 /* CURRENT ERROR */
4412                 buffer[offset] = 0x70;
4413                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4414                 /* ILLEGAL REQUEST */
4415                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4416                 /* INVALID FIELD IN CDB */
4417                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4418                 break;
4419         case TCM_CHECK_CONDITION_ABORT_CMD:
4420                 /* CURRENT ERROR */
4421                 buffer[offset] = 0x70;
4422                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4423                 /* ABORTED COMMAND */
4424                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4425                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4426                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4427                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4428                 break;
4429         case TCM_INCORRECT_AMOUNT_OF_DATA:
4430                 /* CURRENT ERROR */
4431                 buffer[offset] = 0x70;
4432                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4433                 /* ABORTED COMMAND */
4434                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4435                 /* WRITE ERROR */
4436                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4437                 /* NOT ENOUGH UNSOLICITED DATA */
4438                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4439                 break;
4440         case TCM_INVALID_CDB_FIELD:
4441                 /* CURRENT ERROR */
4442                 buffer[offset] = 0x70;
4443                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4444                 /* ILLEGAL REQUEST */
4445                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4446                 /* INVALID FIELD IN CDB */
4447                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4448                 break;
4449         case TCM_INVALID_PARAMETER_LIST:
4450                 /* CURRENT ERROR */
4451                 buffer[offset] = 0x70;
4452                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4453                 /* ILLEGAL REQUEST */
4454                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4455                 /* INVALID FIELD IN PARAMETER LIST */
4456                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4457                 break;
4458         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4459                 /* CURRENT ERROR */
4460                 buffer[offset] = 0x70;
4461                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4462                 /* ABORTED COMMAND */
4463                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4464                 /* WRITE ERROR */
4465                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4466                 /* UNEXPECTED_UNSOLICITED_DATA */
4467                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4468                 break;
4469         case TCM_SERVICE_CRC_ERROR:
4470                 /* CURRENT ERROR */
4471                 buffer[offset] = 0x70;
4472                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4473                 /* ABORTED COMMAND */
4474                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4475                 /* PROTOCOL SERVICE CRC ERROR */
4476                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4477                 /* N/A */
4478                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4479                 break;
4480         case TCM_SNACK_REJECTED:
4481                 /* CURRENT ERROR */
4482                 buffer[offset] = 0x70;
4483                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4484                 /* ABORTED COMMAND */
4485                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4486                 /* READ ERROR */
4487                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4488                 /* FAILED RETRANSMISSION REQUEST */
4489                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4490                 break;
4491         case TCM_WRITE_PROTECTED:
4492                 /* CURRENT ERROR */
4493                 buffer[offset] = 0x70;
4494                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4495                 /* DATA PROTECT */
4496                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4497                 /* WRITE PROTECTED */
4498                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4499                 break;
4500         case TCM_ADDRESS_OUT_OF_RANGE:
4501                 /* CURRENT ERROR */
4502                 buffer[offset] = 0x70;
4503                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4504                 /* ILLEGAL REQUEST */
4505                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4506                 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
4507                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x21;
4508                 break;
4509         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4510                 /* CURRENT ERROR */
4511                 buffer[offset] = 0x70;
4512                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4513                 /* UNIT ATTENTION */
4514                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4515                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4516                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4517                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4518                 break;
4519         case TCM_CHECK_CONDITION_NOT_READY:
4520                 /* CURRENT ERROR */
4521                 buffer[offset] = 0x70;
4522                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4523                 /* Not Ready */
4524                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4525                 transport_get_sense_codes(cmd, &asc, &ascq);
4526                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4527                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4528                 break;
4529         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4530         default:
4531                 /* CURRENT ERROR */
4532                 buffer[offset] = 0x70;
4533                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4534                 /* ILLEGAL REQUEST */
4535                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4536                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4537                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4538                 break;
4539         }
4540         /*
4541          * This code uses linux/include/scsi/scsi.h SAM status codes!
4542          */
4543         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4544         /*
4545          * Automatically padded, this value is encoded in the fabric's
4546          * data_length response PDU containing the SCSI defined sense data.
4547          */
4548         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4549
4550 after_reason:
4551         return cmd->se_tfo->queue_status(cmd);
4552 }
4553 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4554
4555 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4556 {
4557         int ret = 0;
4558
4559         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4560                 if (!send_status ||
4561                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4562                         return 1;
4563 #if 0
4564                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4565                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4566                         cmd->t_task_cdb[0],
4567                         cmd->se_tfo->get_task_tag(cmd));
4568 #endif
4569                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4570                 cmd->se_tfo->queue_status(cmd);
4571                 ret = 1;
4572         }
4573         return ret;
4574 }
4575 EXPORT_SYMBOL(transport_check_aborted_status);
4576
4577 void transport_send_task_abort(struct se_cmd *cmd)
4578 {
4579         unsigned long flags;
4580
4581         spin_lock_irqsave(&cmd->t_state_lock, flags);
4582         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4583                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4584                 return;
4585         }
4586         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4587
4588         /*
4589          * If there are still expected incoming fabric WRITEs, we wait
4590          * until until they have completed before sending a TASK_ABORTED
4591          * response.  This response with TASK_ABORTED status will be
4592          * queued back to fabric module by transport_check_aborted_status().
4593          */
4594         if (cmd->data_direction == DMA_TO_DEVICE) {
4595                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4596                         atomic_inc(&cmd->t_transport_aborted);
4597                         smp_mb__after_atomic_inc();
4598                 }
4599         }
4600         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4601 #if 0
4602         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4603                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4604                 cmd->se_tfo->get_task_tag(cmd));
4605 #endif
4606         cmd->se_tfo->queue_status(cmd);
4607 }
4608
4609 /*      transport_generic_do_tmr():
4610  *
4611  *
4612  */
4613 int transport_generic_do_tmr(struct se_cmd *cmd)
4614 {
4615         struct se_device *dev = cmd->se_dev;
4616         struct se_tmr_req *tmr = cmd->se_tmr_req;
4617         int ret;
4618
4619         switch (tmr->function) {
4620         case TMR_ABORT_TASK:
4621                 tmr->response = TMR_FUNCTION_REJECTED;
4622                 break;
4623         case TMR_ABORT_TASK_SET:
4624         case TMR_CLEAR_ACA:
4625         case TMR_CLEAR_TASK_SET:
4626                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4627                 break;
4628         case TMR_LUN_RESET:
4629                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4630                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4631                                          TMR_FUNCTION_REJECTED;
4632                 break;
4633         case TMR_TARGET_WARM_RESET:
4634                 tmr->response = TMR_FUNCTION_REJECTED;
4635                 break;
4636         case TMR_TARGET_COLD_RESET:
4637                 tmr->response = TMR_FUNCTION_REJECTED;
4638                 break;
4639         default:
4640                 pr_err("Uknown TMR function: 0x%02x.\n",
4641                                 tmr->function);
4642                 tmr->response = TMR_FUNCTION_REJECTED;
4643                 break;
4644         }
4645
4646         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4647         cmd->se_tfo->queue_tm_rsp(cmd);
4648
4649         transport_cmd_check_stop_to_fabric(cmd);
4650         return 0;
4651 }
4652
4653 /*      transport_processing_thread():
4654  *
4655  *
4656  */
4657 static int transport_processing_thread(void *param)
4658 {
4659         int ret;
4660         struct se_cmd *cmd;
4661         struct se_device *dev = (struct se_device *) param;
4662
4663         while (!kthread_should_stop()) {
4664                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4665                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4666                                 kthread_should_stop());
4667                 if (ret < 0)
4668                         goto out;
4669
4670 get_cmd:
4671                 __transport_execute_tasks(dev);
4672
4673                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4674                 if (!cmd)
4675                         continue;
4676
4677                 switch (cmd->t_state) {
4678                 case TRANSPORT_NEW_CMD:
4679                         BUG();
4680                         break;
4681                 case TRANSPORT_NEW_CMD_MAP:
4682                         if (!cmd->se_tfo->new_cmd_map) {
4683                                 pr_err("cmd->se_tfo->new_cmd_map is"
4684                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4685                                 BUG();
4686                         }
4687                         ret = cmd->se_tfo->new_cmd_map(cmd);
4688                         if (ret < 0) {
4689                                 transport_generic_request_failure(cmd);
4690                                 break;
4691                         }
4692                         ret = transport_generic_new_cmd(cmd);
4693                         if (ret < 0) {
4694                                 transport_generic_request_failure(cmd);
4695                                 break;
4696                         }
4697                         break;
4698                 case TRANSPORT_PROCESS_WRITE:
4699                         transport_generic_process_write(cmd);
4700                         break;
4701                 case TRANSPORT_PROCESS_TMR:
4702                         transport_generic_do_tmr(cmd);
4703                         break;
4704                 case TRANSPORT_COMPLETE_QF_WP:
4705                         transport_write_pending_qf(cmd);
4706                         break;
4707                 case TRANSPORT_COMPLETE_QF_OK:
4708                         transport_complete_qf(cmd);
4709                         break;
4710                 default:
4711                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4712                                 "i_state: %d on SE LUN: %u\n",
4713                                 cmd->t_state,
4714                                 cmd->se_tfo->get_task_tag(cmd),
4715                                 cmd->se_tfo->get_cmd_state(cmd),
4716                                 cmd->se_lun->unpacked_lun);
4717                         BUG();
4718                 }
4719
4720                 goto get_cmd;
4721         }
4722
4723 out:
4724         WARN_ON(!list_empty(&dev->state_task_list));
4725         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4726         dev->process_thread = NULL;
4727         return 0;
4728 }