drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <linux/ratelimit.h>
  41 #include <asm/unaligned.h>
  42 #include <net/sock.h>
  43 #include <net/tcp.h>
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_tcq.h>
  47
  48 #include <target/target_core_base.h>
  49 #include <target/target_core_backend.h>
  50 #include <target/target_core_fabric.h>
  51 #include <target/target_core_configfs.h>
  52
  53 #include "target_core_internal.h"
  54 #include "target_core_alua.h"
  55 #include "target_core_pr.h"
  56 #include "target_core_ua.h"
  57
  58 static int sub_api_initialized;
  59
  60 static struct workqueue_struct *target_completion_wq;
  61 static struct kmem_cache *se_sess_cache;
  62 struct kmem_cache *se_ua_cache;
  63 struct kmem_cache *t10_pr_reg_cache;
  64 struct kmem_cache *t10_alua_lu_gp_cache;
  65 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  66 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  67 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  68
  69 static int transport_generic_write_pending(struct se_cmd *);
  70 static int transport_processing_thread(void *param);
  71 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
  72 static void transport_complete_task_attr(struct se_cmd *cmd);
  73 static void transport_handle_queue_full(struct se_cmd *cmd,
  74                 struct se_device *dev);
  75 static int transport_generic_get_mem(struct se_cmd *cmd);
  76 static void transport_put_cmd(struct se_cmd *cmd);
  77 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  78 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  79 static void target_complete_ok_work(struct work_struct *work);
  80
  81 int init_se_kmem_caches(void)
  82 {
  83         se_sess_cache = kmem_cache_create("se_sess_cache",
  84                         sizeof(struct se_session), __alignof__(struct se_session),
  85                         0, NULL);
  86         if (!se_sess_cache) {
  87                 pr_err("kmem_cache_create() for struct se_session"
  88                                 " failed\n");
  89                 goto out;
  90         }
  91         se_ua_cache = kmem_cache_create("se_ua_cache",
  92                         sizeof(struct se_ua), __alignof__(struct se_ua),
  93                         0, NULL);
  94         if (!se_ua_cache) {
  95                 pr_err("kmem_cache_create() for struct se_ua failed\n");
  96                 goto out_free_sess_cache;
  97         }
  98         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  99                         sizeof(struct t10_pr_registration),
 100                         __alignof__(struct t10_pr_registration), 0, NULL);
 101         if (!t10_pr_reg_cache) {
 102                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 103                                 " failed\n");
 104                 goto out_free_ua_cache;
 105         }
 106         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 107                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 108                         0, NULL);
 109         if (!t10_alua_lu_gp_cache) {
 110                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 111                                 " failed\n");
 112                 goto out_free_pr_reg_cache;
 113         }
 114         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 115                         sizeof(struct t10_alua_lu_gp_member),
 116                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 117         if (!t10_alua_lu_gp_mem_cache) {
 118                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 119                                 "cache failed\n");
 120                 goto out_free_lu_gp_cache;
 121         }
 122         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 123                         sizeof(struct t10_alua_tg_pt_gp),
 124                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 125         if (!t10_alua_tg_pt_gp_cache) {
 126                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 127                                 "cache failed\n");
 128                 goto out_free_lu_gp_mem_cache;
 129         }
 130         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 131                         "t10_alua_tg_pt_gp_mem_cache",
 132                         sizeof(struct t10_alua_tg_pt_gp_member),
 133                         __alignof__(struct t10_alua_tg_pt_gp_member),
 134                         0, NULL);
 135         if (!t10_alua_tg_pt_gp_mem_cache) {
 136                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 137                                 "mem_t failed\n");
 138                 goto out_free_tg_pt_gp_cache;
 139         }
 140
 141         target_completion_wq = alloc_workqueue("target_completion",
 142                                                WQ_MEM_RECLAIM, 0);
 143         if (!target_completion_wq)
 144                 goto out_free_tg_pt_gp_mem_cache;
 145
 146         return 0;
 147
 148 out_free_tg_pt_gp_mem_cache:
 149         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 150 out_free_tg_pt_gp_cache:
 151         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 152 out_free_lu_gp_mem_cache:
 153         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 154 out_free_lu_gp_cache:
 155         kmem_cache_destroy(t10_alua_lu_gp_cache);
 156 out_free_pr_reg_cache:
 157         kmem_cache_destroy(t10_pr_reg_cache);
 158 out_free_ua_cache:
 159         kmem_cache_destroy(se_ua_cache);
 160 out_free_sess_cache:
 161         kmem_cache_destroy(se_sess_cache);
 162 out:
 163         return -ENOMEM;
 164 }
 165
 166 void release_se_kmem_caches(void)
 167 {
 168         destroy_workqueue(target_completion_wq);
 169         kmem_cache_destroy(se_sess_cache);
 170         kmem_cache_destroy(se_ua_cache);
 171         kmem_cache_destroy(t10_pr_reg_cache);
 172         kmem_cache_destroy(t10_alua_lu_gp_cache);
 173         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 174         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 175         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 176 }
 177
 178 /* This code ensures unique mib indexes are handed out. */
 179 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 180 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 181
 182 /*
 183  * Allocate a new row index for the entry type specified
 184  */
 185 u32 scsi_get_new_index(scsi_index_t type)
 186 {
 187         u32 new_index;
 188
 189         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 190
 191         spin_lock(&scsi_mib_index_lock);
 192         new_index = ++scsi_mib_index[type];
 193         spin_unlock(&scsi_mib_index_lock);
 194
 195         return new_index;
 196 }
 197
 198 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 199 {
 200         atomic_set(&qobj->queue_cnt, 0);
 201         INIT_LIST_HEAD(&qobj->qobj_list);
 202         init_waitqueue_head(&qobj->thread_wq);
 203         spin_lock_init(&qobj->cmd_queue_lock);
 204 }
 205
 206 void transport_subsystem_check_init(void)
 207 {
 208         int ret;
 209
 210         if (sub_api_initialized)
 211                 return;
 212
 213         ret = request_module("target_core_iblock");
 214         if (ret != 0)
 215                 pr_err("Unable to load target_core_iblock\n");
 216
 217         ret = request_module("target_core_file");
 218         if (ret != 0)
 219                 pr_err("Unable to load target_core_file\n");
 220
 221         ret = request_module("target_core_pscsi");
 222         if (ret != 0)
 223                 pr_err("Unable to load target_core_pscsi\n");
 224
 225         ret = request_module("target_core_stgt");
 226         if (ret != 0)
 227                 pr_err("Unable to load target_core_stgt\n");
 228
 229         sub_api_initialized = 1;
 230         return;
 231 }
 232
 233 struct se_session *transport_init_session(void)
 234 {
 235         struct se_session *se_sess;
 236
 237         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 238         if (!se_sess) {
 239                 pr_err("Unable to allocate struct se_session from"
 240                                 " se_sess_cache\n");
 241                 return ERR_PTR(-ENOMEM);
 242         }
 243         INIT_LIST_HEAD(&se_sess->sess_list);
 244         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 245         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 246         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 247         spin_lock_init(&se_sess->sess_cmd_lock);
 248         kref_init(&se_sess->sess_kref);
 249
 250         return se_sess;
 251 }
 252 EXPORT_SYMBOL(transport_init_session);
 253
 254 /*
 255  * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 256  */
 257 void __transport_register_session(
 258         struct se_portal_group *se_tpg,
 259         struct se_node_acl *se_nacl,
 260         struct se_session *se_sess,
 261         void *fabric_sess_ptr)
 262 {
 263         unsigned char buf[PR_REG_ISID_LEN];
 264
 265         se_sess->se_tpg = se_tpg;
 266         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 267         /*
 268          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 269          *
 270          * Only set for struct se_session's that will actually be moving I/O.
 271          * eg: *NOT* discovery sessions.
 272          */
 273         if (se_nacl) {
 274                 /*
 275                  * If the fabric module supports an ISID based TransportID,
 276                  * save this value in binary from the fabric I_T Nexus now.
 277                  */
 278                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 279                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 280                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 281                                         &buf[0], PR_REG_ISID_LEN);
 282                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 283                 }
 284                 kref_get(&se_nacl->acl_kref);
 285
 286                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 287                 /*
 288                  * The se_nacl->nacl_sess pointer will be set to the
 289                  * last active I_T Nexus for each struct se_node_acl.
 290                  */
 291                 se_nacl->nacl_sess = se_sess;
 292
 293                 list_add_tail(&se_sess->sess_acl_list,
 294                               &se_nacl->acl_sess_list);
 295                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 296         }
 297         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 298
 299         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 300                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 301 }
 302 EXPORT_SYMBOL(__transport_register_session);
 303
 304 void transport_register_session(
 305         struct se_portal_group *se_tpg,
 306         struct se_node_acl *se_nacl,
 307         struct se_session *se_sess,
 308         void *fabric_sess_ptr)
 309 {
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&se_tpg->session_lock, flags);
 313         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 314         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 315 }
 316 EXPORT_SYMBOL(transport_register_session);
 317
 318 void target_release_session(struct kref *kref)
 319 {
 320         struct se_session *se_sess = container_of(kref,
 321                         struct se_session, sess_kref);
 322         struct se_portal_group *se_tpg = se_sess->se_tpg;
 323
 324         se_tpg->se_tpg_tfo->close_session(se_sess);
 325 }
 326
 327 void target_get_session(struct se_session *se_sess)
 328 {
 329         kref_get(&se_sess->sess_kref);
 330 }
 331 EXPORT_SYMBOL(target_get_session);
 332
 333 void target_put_session(struct se_session *se_sess)
 334 {
 335         struct se_portal_group *tpg = se_sess->se_tpg;
 336
 337         if (tpg->se_tpg_tfo->put_session != NULL) {
 338                 tpg->se_tpg_tfo->put_session(se_sess);
 339                 return;
 340         }
 341         kref_put(&se_sess->sess_kref, target_release_session);
 342 }
 343 EXPORT_SYMBOL(target_put_session);
 344
 345 static void target_complete_nacl(struct kref *kref)
 346 {
 347         struct se_node_acl *nacl = container_of(kref,
 348                                 struct se_node_acl, acl_kref);
 349
 350         complete(&nacl->acl_free_comp);
 351 }
 352
 353 void target_put_nacl(struct se_node_acl *nacl)
 354 {
 355         kref_put(&nacl->acl_kref, target_complete_nacl);
 356 }
 357
 358 void transport_deregister_session_configfs(struct se_session *se_sess)
 359 {
 360         struct se_node_acl *se_nacl;
 361         unsigned long flags;
 362         /*
 363          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 364          */
 365         se_nacl = se_sess->se_node_acl;
 366         if (se_nacl) {
 367                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 368                 if (se_nacl->acl_stop == 0)
 369                         list_del(&se_sess->sess_acl_list);
 370                 /*
 371                  * If the session list is empty, then clear the pointer.
 372                  * Otherwise, set the struct se_session pointer from the tail
 373                  * element of the per struct se_node_acl active session list.
 374                  */
 375                 if (list_empty(&se_nacl->acl_sess_list))
 376                         se_nacl->nacl_sess = NULL;
 377                 else {
 378                         se_nacl->nacl_sess = container_of(
 379                                         se_nacl->acl_sess_list.prev,
 380                                         struct se_session, sess_acl_list);
 381                 }
 382                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 383         }
 384 }
 385 EXPORT_SYMBOL(transport_deregister_session_configfs);
 386
 387 void transport_free_session(struct se_session *se_sess)
 388 {
 389         kmem_cache_free(se_sess_cache, se_sess);
 390 }
 391 EXPORT_SYMBOL(transport_free_session);
 392
 393 void transport_deregister_session(struct se_session *se_sess)
 394 {
 395         struct se_portal_group *se_tpg = se_sess->se_tpg;
 396         struct target_core_fabric_ops *se_tfo;
 397         struct se_node_acl *se_nacl;
 398         unsigned long flags;
 399         bool comp_nacl = true;
 400
 401         if (!se_tpg) {
 402                 transport_free_session(se_sess);
 403                 return;
 404         }
 405         se_tfo = se_tpg->se_tpg_tfo;
 406
 407         spin_lock_irqsave(&se_tpg->session_lock, flags);
 408         list_del(&se_sess->sess_list);
 409         se_sess->se_tpg = NULL;
 410         se_sess->fabric_sess_ptr = NULL;
 411         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 412
 413         /*
 414          * Determine if we need to do extra work for this initiator node's
 415          * struct se_node_acl if it had been previously dynamically generated.
 416          */
 417         se_nacl = se_sess->se_node_acl;
 418
 419         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 420         if (se_nacl && se_nacl->dynamic_node_acl) {
 421                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 422                         list_del(&se_nacl->acl_list);
 423                         se_tpg->num_node_acls--;
 424                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 425                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 426                         core_free_device_list_for_node(se_nacl, se_tpg);
 427                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 428
 429                         comp_nacl = false;
 430                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 431                 }
 432         }
 433         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 434
 435         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 436                 se_tpg->se_tpg_tfo->get_fabric_name());
 437         /*
 438          * If last kref is dropping now for an explict NodeACL, awake sleeping
 439          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 440          * removal context.
 441          */
 442         if (se_nacl && comp_nacl == true)
 443                 target_put_nacl(se_nacl);
 444
 445         transport_free_session(se_sess);
 446 }
 447 EXPORT_SYMBOL(transport_deregister_session);
 448
 449 /*
 450  * Called with cmd->t_state_lock held.
 451  */
 452 static void target_remove_from_state_list(struct se_cmd *cmd)
 453 {
 454         struct se_device *dev = cmd->se_dev;
 455         unsigned long flags;
 456
 457         if (!dev)
 458                 return;
 459
 460         if (cmd->transport_state & CMD_T_BUSY)
 461                 return;
 462
 463         spin_lock_irqsave(&dev->execute_task_lock, flags);
 464         if (cmd->state_active) {
 465                 list_del(&cmd->state_list);
 466                 cmd->state_active = false;
 467         }
 468         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 469 }
 470
 471 /*      transport_cmd_check_stop():
 472  *
 473  *      'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
 474  *      'transport_off = 2' determines if task_dev_state should be removed.
 475  *
 476  *      A non-zero u8 t_state sets cmd->t_state.
 477  *      Returns 1 when command is stopped, else 0.
 478  */
 479 static int transport_cmd_check_stop(
 480         struct se_cmd *cmd,
 481         int transport_off,
 482         u8 t_state)
 483 {
 484         unsigned long flags;
 485
 486         spin_lock_irqsave(&cmd->t_state_lock, flags);
 487         /*
 488          * Determine if IOCTL context caller in requesting the stopping of this
 489          * command for LUN shutdown purposes.
 490          */
 491         if (cmd->transport_state & CMD_T_LUN_STOP) {
 492                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 493                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 494
 495                 cmd->transport_state &= ~CMD_T_ACTIVE;
 496                 if (transport_off == 2)
 497                         target_remove_from_state_list(cmd);
 498                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 499
 500                 complete(&cmd->transport_lun_stop_comp);
 501                 return 1;
 502         }
 503         /*
 504          * Determine if frontend context caller is requesting the stopping of
 505          * this command for frontend exceptions.
 506          */
 507         if (cmd->transport_state & CMD_T_STOP) {
 508                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 509                         __func__, __LINE__,
 510                         cmd->se_tfo->get_task_tag(cmd));
 511
 512                 if (transport_off == 2)
 513                         target_remove_from_state_list(cmd);
 514
 515                 /*
 516                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 517                  * to FE.
 518                  */
 519                 if (transport_off == 2)
 520                         cmd->se_lun = NULL;
 521                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 522
 523                 complete(&cmd->t_transport_stop_comp);
 524                 return 1;
 525         }
 526         if (transport_off) {
 527                 cmd->transport_state &= ~CMD_T_ACTIVE;
 528                 if (transport_off == 2) {
 529                         target_remove_from_state_list(cmd);
 530                         /*
 531                          * Clear struct se_cmd->se_lun before the transport_off == 2
 532                          * handoff to fabric module.
 533                          */
 534                         cmd->se_lun = NULL;
 535                         /*
 536                          * Some fabric modules like tcm_loop can release
 537                          * their internally allocated I/O reference now and
 538                          * struct se_cmd now.
 539                          *
 540                          * Fabric modules are expected to return '1' here if the
 541                          * se_cmd being passed is released at this point,
 542                          * or zero if not being released.
 543                          */
 544                         if (cmd->se_tfo->check_stop_free != NULL) {
 545                                 spin_unlock_irqrestore(
 546                                         &cmd->t_state_lock, flags);
 547
 548                                 return cmd->se_tfo->check_stop_free(cmd);
 549                         }
 550                 }
 551                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 552
 553                 return 0;
 554         } else if (t_state)
 555                 cmd->t_state = t_state;
 556         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 557
 558         return 0;
 559 }
 560
 561 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 562 {
 563         return transport_cmd_check_stop(cmd, 2, 0);
 564 }
 565
 566 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 567 {
 568         struct se_lun *lun = cmd->se_lun;
 569         unsigned long flags;
 570
 571         if (!lun)
 572                 return;
 573
 574         spin_lock_irqsave(&cmd->t_state_lock, flags);
 575         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 576                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 577                 target_remove_from_state_list(cmd);
 578         }
 579         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 580
 581         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 582         if (!list_empty(&cmd->se_lun_node))
 583                 list_del_init(&cmd->se_lun_node);
 584         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 585 }
 586
 587 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 588 {
 589         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 590                 transport_lun_remove_cmd(cmd);
 591
 592         if (transport_cmd_check_stop_to_fabric(cmd))
 593                 return;
 594         if (remove) {
 595                 transport_remove_cmd_from_queue(cmd);
 596                 transport_put_cmd(cmd);
 597         }
 598 }
 599
 600 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 601                 bool at_head)
 602 {
 603         struct se_device *dev = cmd->se_dev;
 604         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 605         unsigned long flags;
 606
 607         if (t_state) {
 608                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 609                 cmd->t_state = t_state;
 610                 cmd->transport_state |= CMD_T_ACTIVE;
 611                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 612         }
 613
 614         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 615
 616         /* If the cmd is already on the list, remove it before we add it */
 617         if (!list_empty(&cmd->se_queue_node))
 618                 list_del(&cmd->se_queue_node);
 619         else
 620                 atomic_inc(&qobj->queue_cnt);
 621
 622         if (at_head)
 623                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 624         else
 625                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 626         cmd->transport_state |= CMD_T_QUEUED;
 627         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 628
 629         wake_up_interruptible(&qobj->thread_wq);
 630 }
 631
 632 static struct se_cmd *
 633 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 634 {
 635         struct se_cmd *cmd;
 636         unsigned long flags;
 637
 638         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 639         if (list_empty(&qobj->qobj_list)) {
 640                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 641                 return NULL;
 642         }
 643         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 644
 645         cmd->transport_state &= ~CMD_T_QUEUED;
 646         list_del_init(&cmd->se_queue_node);
 647         atomic_dec(&qobj->queue_cnt);
 648         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 649
 650         return cmd;
 651 }
 652
 653 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 654 {
 655         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 656         unsigned long flags;
 657
 658         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 659         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 660                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 661                 return;
 662         }
 663         cmd->transport_state &= ~CMD_T_QUEUED;
 664         atomic_dec(&qobj->queue_cnt);
 665         list_del_init(&cmd->se_queue_node);
 666         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 667 }
 668
 669 static void target_complete_failure_work(struct work_struct *work)
 670 {
 671         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 672
 673         transport_generic_request_failure(cmd);
 674 }
 675
 676 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 677 {
 678         struct se_device *dev = cmd->se_dev;
 679         int success = scsi_status == GOOD;
 680         unsigned long flags;
 681
 682         cmd->scsi_status = scsi_status;
 683
 684
 685         spin_lock_irqsave(&cmd->t_state_lock, flags);
 686         cmd->transport_state &= ~CMD_T_BUSY;
 687
 688         if (dev && dev->transport->transport_complete) {
 689                 if (dev->transport->transport_complete(cmd,
 690                                 cmd->t_data_sg) != 0) {
 691                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 692                         success = 1;
 693                 }
 694         }
 695
 696         /*
 697          * See if we are waiting to complete for an exception condition.
 698          */
 699         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 700                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 701                 complete(&cmd->task_stop_comp);
 702                 return;
 703         }
 704
 705         if (!success)
 706                 cmd->transport_state |= CMD_T_FAILED;
 707
 708         /*
 709          * Check for case where an explict ABORT_TASK has been received
 710          * and transport_wait_for_tasks() will be waiting for completion..
 711          */
 712         if (cmd->transport_state & CMD_T_ABORTED &&
 713             cmd->transport_state & CMD_T_STOP) {
 714                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 715                 complete(&cmd->t_transport_stop_comp);
 716                 return;
 717         } else if (cmd->transport_state & CMD_T_FAILED) {
 718                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 719                 INIT_WORK(&cmd->work, target_complete_failure_work);
 720         } else {
 721                 INIT_WORK(&cmd->work, target_complete_ok_work);
 722         }
 723
 724         cmd->t_state = TRANSPORT_COMPLETE;
 725         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 726         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 727
 728         queue_work(target_completion_wq, &cmd->work);
 729 }
 730 EXPORT_SYMBOL(target_complete_cmd);
 731
 732 static void target_add_to_state_list(struct se_cmd *cmd)
 733 {
 734         struct se_device *dev = cmd->se_dev;
 735         unsigned long flags;
 736
 737         spin_lock_irqsave(&dev->execute_task_lock, flags);
 738         if (!cmd->state_active) {
 739                 list_add_tail(&cmd->state_list, &dev->state_list);
 740                 cmd->state_active = true;
 741         }
 742         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 743 }
 744
 745 static void __target_add_to_execute_list(struct se_cmd *cmd)
 746 {
 747         struct se_device *dev = cmd->se_dev;
 748         bool head_of_queue = false;
 749
 750         if (!list_empty(&cmd->execute_list))
 751                 return;
 752
 753         if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
 754             cmd->sam_task_attr == MSG_HEAD_TAG)
 755                 head_of_queue = true;
 756
 757         if (head_of_queue)
 758                 list_add(&cmd->execute_list, &dev->execute_list);
 759         else
 760                 list_add_tail(&cmd->execute_list, &dev->execute_list);
 761
 762         atomic_inc(&dev->execute_tasks);
 763
 764         if (cmd->state_active)
 765                 return;
 766
 767         if (head_of_queue)
 768                 list_add(&cmd->state_list, &dev->state_list);
 769         else
 770                 list_add_tail(&cmd->state_list, &dev->state_list);
 771
 772         cmd->state_active = true;
 773 }
 774
 775 static void target_add_to_execute_list(struct se_cmd *cmd)
 776 {
 777         unsigned long flags;
 778         struct se_device *dev = cmd->se_dev;
 779
 780         spin_lock_irqsave(&dev->execute_task_lock, flags);
 781         __target_add_to_execute_list(cmd);
 782         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 783 }
 784
 785 void __target_remove_from_execute_list(struct se_cmd *cmd)
 786 {
 787         list_del_init(&cmd->execute_list);
 788         atomic_dec(&cmd->se_dev->execute_tasks);
 789 }
 790
 791 static void target_remove_from_execute_list(struct se_cmd *cmd)
 792 {
 793         struct se_device *dev = cmd->se_dev;
 794         unsigned long flags;
 795
 796         if (WARN_ON(list_empty(&cmd->execute_list)))
 797                 return;
 798
 799         spin_lock_irqsave(&dev->execute_task_lock, flags);
 800         __target_remove_from_execute_list(cmd);
 801         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 802 }
 803
 804 /*
 805  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 806  */
 807
 808 static void target_qf_do_work(struct work_struct *work)
 809 {
 810         struct se_device *dev = container_of(work, struct se_device,
 811                                         qf_work_queue);
 812         LIST_HEAD(qf_cmd_list);
 813         struct se_cmd *cmd, *cmd_tmp;
 814
 815         spin_lock_irq(&dev->qf_cmd_lock);
 816         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 817         spin_unlock_irq(&dev->qf_cmd_lock);
 818
 819         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 820                 list_del(&cmd->se_qf_node);
 821                 atomic_dec(&dev->dev_qf_count);
 822                 smp_mb__after_atomic_dec();
 823
 824                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 825                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 826                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 827                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 828                         : "UNKNOWN");
 829
 830                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 831         }
 832 }
 833
 834 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 835 {
 836         switch (cmd->data_direction) {
 837         case DMA_NONE:
 838                 return "NONE";
 839         case DMA_FROM_DEVICE:
 840                 return "READ";
 841         case DMA_TO_DEVICE:
 842                 return "WRITE";
 843         case DMA_BIDIRECTIONAL:
 844                 return "BIDI";
 845         default:
 846                 break;
 847         }
 848
 849         return "UNKNOWN";
 850 }
 851
 852 void transport_dump_dev_state(
 853         struct se_device *dev,
 854         char *b,
 855         int *bl)
 856 {
 857         *bl += sprintf(b + *bl, "Status: ");
 858         switch (dev->dev_status) {
 859         case TRANSPORT_DEVICE_ACTIVATED:
 860                 *bl += sprintf(b + *bl, "ACTIVATED");
 861                 break;
 862         case TRANSPORT_DEVICE_DEACTIVATED:
 863                 *bl += sprintf(b + *bl, "DEACTIVATED");
 864                 break;
 865         case TRANSPORT_DEVICE_SHUTDOWN:
 866                 *bl += sprintf(b + *bl, "SHUTDOWN");
 867                 break;
 868         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 869         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 870                 *bl += sprintf(b + *bl, "OFFLINE");
 871                 break;
 872         default:
 873                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 874                 break;
 875         }
 876
 877         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 878                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 879         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 880                 dev->se_sub_dev->se_dev_attrib.block_size,
 881                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 882         *bl += sprintf(b + *bl, "        ");
 883 }
 884
 885 void transport_dump_vpd_proto_id(
 886         struct t10_vpd *vpd,
 887         unsigned char *p_buf,
 888         int p_buf_len)
 889 {
 890         unsigned char buf[VPD_TMP_BUF_SIZE];
 891         int len;
 892
 893         memset(buf, 0, VPD_TMP_BUF_SIZE);
 894         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 895
 896         switch (vpd->protocol_identifier) {
 897         case 0x00:
 898                 sprintf(buf+len, "Fibre Channel\n");
 899                 break;
 900         case 0x10:
 901                 sprintf(buf+len, "Parallel SCSI\n");
 902                 break;
 903         case 0x20:
 904                 sprintf(buf+len, "SSA\n");
 905                 break;
 906         case 0x30:
 907                 sprintf(buf+len, "IEEE 1394\n");
 908                 break;
 909         case 0x40:
 910                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 911                                 " Protocol\n");
 912                 break;
 913         case 0x50:
 914                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 915                 break;
 916         case 0x60:
 917                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 918                 break;
 919         case 0x70:
 920                 sprintf(buf+len, "Automation/Drive Interface Transport"
 921                                 " Protocol\n");
 922                 break;
 923         case 0x80:
 924                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 925                 break;
 926         default:
 927                 sprintf(buf+len, "Unknown 0x%02x\n",
 928                                 vpd->protocol_identifier);
 929                 break;
 930         }
 931
 932         if (p_buf)
 933                 strncpy(p_buf, buf, p_buf_len);
 934         else
 935                 pr_debug("%s", buf);
 936 }
 937
 938 void
 939 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 940 {
 941         /*
 942          * Check if the Protocol Identifier Valid (PIV) bit is set..
 943          *
 944          * from spc3r23.pdf section 7.5.1
 945          */
 946          if (page_83[1] & 0x80) {
 947                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 948                 vpd->protocol_identifier_set = 1;
 949                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 950         }
 951 }
 952 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 953
 954 int transport_dump_vpd_assoc(
 955         struct t10_vpd *vpd,
 956         unsigned char *p_buf,
 957         int p_buf_len)
 958 {
 959         unsigned char buf[VPD_TMP_BUF_SIZE];
 960         int ret = 0;
 961         int len;
 962
 963         memset(buf, 0, VPD_TMP_BUF_SIZE);
 964         len = sprintf(buf, "T10 VPD Identifier Association: ");
 965
 966         switch (vpd->association) {
 967         case 0x00:
 968                 sprintf(buf+len, "addressed logical unit\n");
 969                 break;
 970         case 0x10:
 971                 sprintf(buf+len, "target port\n");
 972                 break;
 973         case 0x20:
 974                 sprintf(buf+len, "SCSI target device\n");
 975                 break;
 976         default:
 977                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 978                 ret = -EINVAL;
 979                 break;
 980         }
 981
 982         if (p_buf)
 983                 strncpy(p_buf, buf, p_buf_len);
 984         else
 985                 pr_debug("%s", buf);
 986
 987         return ret;
 988 }
 989
 990 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 991 {
 992         /*
 993          * The VPD identification association..
 994          *
 995          * from spc3r23.pdf Section 7.6.3.1 Table 297
 996          */
 997         vpd->association = (page_83[1] & 0x30);
 998         return transport_dump_vpd_assoc(vpd, NULL, 0);
 999 }
1000 EXPORT_SYMBOL(transport_set_vpd_assoc);
1001
1002 int transport_dump_vpd_ident_type(
1003         struct t10_vpd *vpd,
1004         unsigned char *p_buf,
1005         int p_buf_len)
1006 {
1007         unsigned char buf[VPD_TMP_BUF_SIZE];
1008         int ret = 0;
1009         int len;
1010
1011         memset(buf, 0, VPD_TMP_BUF_SIZE);
1012         len = sprintf(buf, "T10 VPD Identifier Type: ");
1013
1014         switch (vpd->device_identifier_type) {
1015         case 0x00:
1016                 sprintf(buf+len, "Vendor specific\n");
1017                 break;
1018         case 0x01:
1019                 sprintf(buf+len, "T10 Vendor ID based\n");
1020                 break;
1021         case 0x02:
1022                 sprintf(buf+len, "EUI-64 based\n");
1023                 break;
1024         case 0x03:
1025                 sprintf(buf+len, "NAA\n");
1026                 break;
1027         case 0x04:
1028                 sprintf(buf+len, "Relative target port identifier\n");
1029                 break;
1030         case 0x08:
1031                 sprintf(buf+len, "SCSI name string\n");
1032                 break;
1033         default:
1034                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1035                                 vpd->device_identifier_type);
1036                 ret = -EINVAL;
1037                 break;
1038         }
1039
1040         if (p_buf) {
1041                 if (p_buf_len < strlen(buf)+1)
1042                         return -EINVAL;
1043                 strncpy(p_buf, buf, p_buf_len);
1044         } else {
1045                 pr_debug("%s", buf);
1046         }
1047
1048         return ret;
1049 }
1050
1051 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1052 {
1053         /*
1054          * The VPD identifier type..
1055          *
1056          * from spc3r23.pdf Section 7.6.3.1 Table 298
1057          */
1058         vpd->device_identifier_type = (page_83[1] & 0x0f);
1059         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1060 }
1061 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1062
1063 int transport_dump_vpd_ident(
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
1071         memset(buf, 0, VPD_TMP_BUF_SIZE);
1072
1073         switch (vpd->device_identifier_code_set) {
1074         case 0x01: /* Binary */
1075                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1076                         &vpd->device_identifier[0]);
1077                 break;
1078         case 0x02: /* ASCII */
1079                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1080                         &vpd->device_identifier[0]);
1081                 break;
1082         case 0x03: /* UTF-8 */
1083                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1084                         &vpd->device_identifier[0]);
1085                 break;
1086         default:
1087                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1088                         " 0x%02x", vpd->device_identifier_code_set);
1089                 ret = -EINVAL;
1090                 break;
1091         }
1092
1093         if (p_buf)
1094                 strncpy(p_buf, buf, p_buf_len);
1095         else
1096                 pr_debug("%s", buf);
1097
1098         return ret;
1099 }
1100
1101 int
1102 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1103 {
1104         static const char hex_str[] = "0123456789abcdef";
1105         int j = 0, i = 4; /* offset to start of the identifer */
1106
1107         /*
1108          * The VPD Code Set (encoding)
1109          *
1110          * from spc3r23.pdf Section 7.6.3.1 Table 296
1111          */
1112         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1113         switch (vpd->device_identifier_code_set) {
1114         case 0x01: /* Binary */
1115                 vpd->device_identifier[j++] =
1116                                 hex_str[vpd->device_identifier_type];
1117                 while (i < (4 + page_83[3])) {
1118                         vpd->device_identifier[j++] =
1119                                 hex_str[(page_83[i] & 0xf0) >> 4];
1120                         vpd->device_identifier[j++] =
1121                                 hex_str[page_83[i] & 0x0f];
1122                         i++;
1123                 }
1124                 break;
1125         case 0x02: /* ASCII */
1126         case 0x03: /* UTF-8 */
1127                 while (i < (4 + page_83[3]))
1128                         vpd->device_identifier[j++] = page_83[i++];
1129                 break;
1130         default:
1131                 break;
1132         }
1133
1134         return transport_dump_vpd_ident(vpd, NULL, 0);
1135 }
1136 EXPORT_SYMBOL(transport_set_vpd_ident);
1137
1138 static void core_setup_task_attr_emulation(struct se_device *dev)
1139 {
1140         /*
1141          * If this device is from Target_Core_Mod/pSCSI, disable the
1142          * SAM Task Attribute emulation.
1143          *
1144          * This is currently not available in upsream Linux/SCSI Target
1145          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1146          */
1147         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1148                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1149                 return;
1150         }
1151
1152         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1153         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1154                 " device\n", dev->transport->name,
1155                 dev->transport->get_device_rev(dev));
1156 }
1157
1158 static void scsi_dump_inquiry(struct se_device *dev)
1159 {
1160         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1161         char buf[17];
1162         int i, device_type;
1163         /*
1164          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1165          */
1166         for (i = 0; i < 8; i++)
1167                 if (wwn->vendor[i] >= 0x20)
1168                         buf[i] = wwn->vendor[i];
1169                 else
1170                         buf[i] = ' ';
1171         buf[i] = '\0';
1172         pr_debug("  Vendor: %s\n", buf);
1173
1174         for (i = 0; i < 16; i++)
1175                 if (wwn->model[i] >= 0x20)
1176                         buf[i] = wwn->model[i];
1177                 else
1178                         buf[i] = ' ';
1179         buf[i] = '\0';
1180         pr_debug("  Model: %s\n", buf);
1181
1182         for (i = 0; i < 4; i++)
1183                 if (wwn->revision[i] >= 0x20)
1184                         buf[i] = wwn->revision[i];
1185                 else
1186                         buf[i] = ' ';
1187         buf[i] = '\0';
1188         pr_debug("  Revision: %s\n", buf);
1189
1190         device_type = dev->transport->get_device_type(dev);
1191         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1192         pr_debug("                 ANSI SCSI revision: %02x\n",
1193                                 dev->transport->get_device_rev(dev));
1194 }
1195
1196 struct se_device *transport_add_device_to_core_hba(
1197         struct se_hba *hba,
1198         struct se_subsystem_api *transport,
1199         struct se_subsystem_dev *se_dev,
1200         u32 device_flags,
1201         void *transport_dev,
1202         struct se_dev_limits *dev_limits,
1203         const char *inquiry_prod,
1204         const char *inquiry_rev)
1205 {
1206         int force_pt;
1207         struct se_device  *dev;
1208
1209         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1210         if (!dev) {
1211                 pr_err("Unable to allocate memory for se_dev_t\n");
1212                 return NULL;
1213         }
1214
1215         transport_init_queue_obj(&dev->dev_queue_obj);
1216         dev->dev_flags          = device_flags;
1217         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1218         dev->dev_ptr            = transport_dev;
1219         dev->se_hba             = hba;
1220         dev->se_sub_dev         = se_dev;
1221         dev->transport          = transport;
1222         INIT_LIST_HEAD(&dev->dev_list);
1223         INIT_LIST_HEAD(&dev->dev_sep_list);
1224         INIT_LIST_HEAD(&dev->dev_tmr_list);
1225         INIT_LIST_HEAD(&dev->execute_list);
1226         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1227         INIT_LIST_HEAD(&dev->state_list);
1228         INIT_LIST_HEAD(&dev->qf_cmd_list);
1229         spin_lock_init(&dev->execute_task_lock);
1230         spin_lock_init(&dev->delayed_cmd_lock);
1231         spin_lock_init(&dev->dev_reservation_lock);
1232         spin_lock_init(&dev->dev_status_lock);
1233         spin_lock_init(&dev->se_port_lock);
1234         spin_lock_init(&dev->se_tmr_lock);
1235         spin_lock_init(&dev->qf_cmd_lock);
1236         atomic_set(&dev->dev_ordered_id, 0);
1237
1238         se_dev_set_default_attribs(dev, dev_limits);
1239
1240         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1241         dev->creation_time = get_jiffies_64();
1242         spin_lock_init(&dev->stats_lock);
1243
1244         spin_lock(&hba->device_lock);
1245         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1246         hba->dev_count++;
1247         spin_unlock(&hba->device_lock);
1248         /*
1249          * Setup the SAM Task Attribute emulation for struct se_device
1250          */
1251         core_setup_task_attr_emulation(dev);
1252         /*
1253          * Force PR and ALUA passthrough emulation with internal object use.
1254          */
1255         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1256         /*
1257          * Setup the Reservations infrastructure for struct se_device
1258          */
1259         core_setup_reservations(dev, force_pt);
1260         /*
1261          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1262          */
1263         if (core_setup_alua(dev, force_pt) < 0)
1264                 goto out;
1265
1266         /*
1267          * Startup the struct se_device processing thread
1268          */
1269         dev->process_thread = kthread_run(transport_processing_thread, dev,
1270                                           "LIO_%s", dev->transport->name);
1271         if (IS_ERR(dev->process_thread)) {
1272                 pr_err("Unable to create kthread: LIO_%s\n",
1273                         dev->transport->name);
1274                 goto out;
1275         }
1276         /*
1277          * Setup work_queue for QUEUE_FULL
1278          */
1279         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1280         /*
1281          * Preload the initial INQUIRY const values if we are doing
1282          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1283          * passthrough because this is being provided by the backend LLD.
1284          * This is required so that transport_get_inquiry() copies these
1285          * originals once back into DEV_T10_WWN(dev) for the virtual device
1286          * setup.
1287          */
1288         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1289                 if (!inquiry_prod || !inquiry_rev) {
1290                         pr_err("All non TCM/pSCSI plugins require"
1291                                 " INQUIRY consts\n");
1292                         goto out;
1293                 }
1294
1295                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1296                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1297                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1298         }
1299         scsi_dump_inquiry(dev);
1300
1301         return dev;
1302 out:
1303         kthread_stop(dev->process_thread);
1304
1305         spin_lock(&hba->device_lock);
1306         list_del(&dev->dev_list);
1307         hba->dev_count--;
1308         spin_unlock(&hba->device_lock);
1309
1310         se_release_vpd_for_dev(dev);
1311
1312         kfree(dev);
1313
1314         return NULL;
1315 }
1316 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1317
1318 /*      transport_generic_prepare_cdb():
1319  *
1320  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1321  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1322  *      The point of this is since we are mapping iSCSI LUNs to
1323  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1324  *      devices and HBAs for a loop.
1325  */
1326 static inline void transport_generic_prepare_cdb(
1327         unsigned char *cdb)
1328 {
1329         switch (cdb[0]) {
1330         case READ_10: /* SBC - RDProtect */
1331         case READ_12: /* SBC - RDProtect */
1332         case READ_16: /* SBC - RDProtect */
1333         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1334         case VERIFY: /* SBC - VRProtect */
1335         case VERIFY_16: /* SBC - VRProtect */
1336         case WRITE_VERIFY: /* SBC - VRProtect */
1337         case WRITE_VERIFY_12: /* SBC - VRProtect */
1338         case MAINTENANCE_IN: /* SPC - Parameter Data Format for SA RTPG */
1339                 break;
1340         default:
1341                 cdb[1] &= 0x1f; /* clear logical unit number */
1342                 break;
1343         }
1344 }
1345
1346 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1347
1348 /*
1349  * Used by fabric modules containing a local struct se_cmd within their
1350  * fabric dependent per I/O descriptor.
1351  */
1352 void transport_init_se_cmd(
1353         struct se_cmd *cmd,
1354         struct target_core_fabric_ops *tfo,
1355         struct se_session *se_sess,
1356         u32 data_length,
1357         int data_direction,
1358         int task_attr,
1359         unsigned char *sense_buffer)
1360 {
1361         INIT_LIST_HEAD(&cmd->se_lun_node);
1362         INIT_LIST_HEAD(&cmd->se_delayed_node);
1363         INIT_LIST_HEAD(&cmd->se_qf_node);
1364         INIT_LIST_HEAD(&cmd->se_queue_node);
1365         INIT_LIST_HEAD(&cmd->se_cmd_list);
1366         INIT_LIST_HEAD(&cmd->execute_list);
1367         INIT_LIST_HEAD(&cmd->state_list);
1368         init_completion(&cmd->transport_lun_fe_stop_comp);
1369         init_completion(&cmd->transport_lun_stop_comp);
1370         init_completion(&cmd->t_transport_stop_comp);
1371         init_completion(&cmd->cmd_wait_comp);
1372         init_completion(&cmd->task_stop_comp);
1373         spin_lock_init(&cmd->t_state_lock);
1374         cmd->transport_state = CMD_T_DEV_ACTIVE;
1375
1376         cmd->se_tfo = tfo;
1377         cmd->se_sess = se_sess;
1378         cmd->data_length = data_length;
1379         cmd->data_direction = data_direction;
1380         cmd->sam_task_attr = task_attr;
1381         cmd->sense_buffer = sense_buffer;
1382
1383         cmd->state_active = false;
1384 }
1385 EXPORT_SYMBOL(transport_init_se_cmd);
1386
1387 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1388 {
1389         /*
1390          * Check if SAM Task Attribute emulation is enabled for this
1391          * struct se_device storage object
1392          */
1393         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1394                 return 0;
1395
1396         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1397                 pr_debug("SAM Task Attribute ACA"
1398                         " emulation is not supported\n");
1399                 return -EINVAL;
1400         }
1401         /*
1402          * Used to determine when ORDERED commands should go from
1403          * Dormant to Active status.
1404          */
1405         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1406         smp_mb__after_atomic_inc();
1407         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1408                         cmd->se_ordered_id, cmd->sam_task_attr,
1409                         cmd->se_dev->transport->name);
1410         return 0;
1411 }
1412
1413 /*      target_setup_cmd_from_cdb():
1414  *
1415  *      Called from fabric RX Thread.
1416  */
1417 int target_setup_cmd_from_cdb(
1418         struct se_cmd *cmd,
1419         unsigned char *cdb)
1420 {
1421         int ret;
1422
1423         transport_generic_prepare_cdb(cdb);
1424         /*
1425          * Ensure that the received CDB is less than the max (252 + 8) bytes
1426          * for VARIABLE_LENGTH_CMD
1427          */
1428         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1429                 pr_err("Received SCSI CDB with command_size: %d that"
1430                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1431                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1432                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1433                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1434                 return -EINVAL;
1435         }
1436         /*
1437          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1438          * allocate the additional extended CDB buffer now..  Otherwise
1439          * setup the pointer from __t_task_cdb to t_task_cdb.
1440          */
1441         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1442                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1443                                                 GFP_KERNEL);
1444                 if (!cmd->t_task_cdb) {
1445                         pr_err("Unable to allocate cmd->t_task_cdb"
1446                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1447                                 scsi_command_size(cdb),
1448                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1449                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1450                         cmd->scsi_sense_reason =
1451                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1452                         return -ENOMEM;
1453                 }
1454         } else
1455                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1456         /*
1457          * Copy the original CDB into cmd->
1458          */
1459         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1460         /*
1461          * Setup the received CDB based on SCSI defined opcodes and
1462          * perform unit attention, persistent reservations and ALUA
1463          * checks for virtual device backends.  The cmd->t_task_cdb
1464          * pointer is expected to be setup before we reach this point.
1465          */
1466         ret = transport_generic_cmd_sequencer(cmd, cdb);
1467         if (ret < 0)
1468                 return ret;
1469         /*
1470          * Check for SAM Task Attribute Emulation
1471          */
1472         if (transport_check_alloc_task_attr(cmd) < 0) {
1473                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1474                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1475                 return -EINVAL;
1476         }
1477         spin_lock(&cmd->se_lun->lun_sep_lock);
1478         if (cmd->se_lun->lun_sep)
1479                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1480         spin_unlock(&cmd->se_lun->lun_sep_lock);
1481         return 0;
1482 }
1483 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1484
1485 /*
1486  * Used by fabric module frontends to queue tasks directly.
1487  * Many only be used from process context only
1488  */
1489 int transport_handle_cdb_direct(
1490         struct se_cmd *cmd)
1491 {
1492         int ret;
1493
1494         if (!cmd->se_lun) {
1495                 dump_stack();
1496                 pr_err("cmd->se_lun is NULL\n");
1497                 return -EINVAL;
1498         }
1499         if (in_interrupt()) {
1500                 dump_stack();
1501                 pr_err("transport_generic_handle_cdb cannot be called"
1502                                 " from interrupt context\n");
1503                 return -EINVAL;
1504         }
1505         /*
1506          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1507          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1508          * in existing usage to ensure that outstanding descriptors are handled
1509          * correctly during shutdown via transport_wait_for_tasks()
1510          *
1511          * Also, we don't take cmd->t_state_lock here as we only expect
1512          * this to be called for initial descriptor submission.
1513          */
1514         cmd->t_state = TRANSPORT_NEW_CMD;
1515         cmd->transport_state |= CMD_T_ACTIVE;
1516
1517         /*
1518          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1519          * so follow TRANSPORT_NEW_CMD processing thread context usage
1520          * and call transport_generic_request_failure() if necessary..
1521          */
1522         ret = transport_generic_new_cmd(cmd);
1523         if (ret < 0)
1524                 transport_generic_request_failure(cmd);
1525
1526         return 0;
1527 }
1528 EXPORT_SYMBOL(transport_handle_cdb_direct);
1529
1530 /**
1531  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1532  *
1533  * @se_cmd: command descriptor to submit
1534  * @se_sess: associated se_sess for endpoint
1535  * @cdb: pointer to SCSI CDB
1536  * @sense: pointer to SCSI sense buffer
1537  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1538  * @data_length: fabric expected data transfer length
1539  * @task_addr: SAM task attribute
1540  * @data_dir: DMA data direction
1541  * @flags: flags for command submission from target_sc_flags_tables
1542  *
1543  * This may only be called from process context, and also currently
1544  * assumes internal allocation of fabric payload buffer by target-core.
1545  **/
1546 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1547                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1548                 u32 data_length, int task_attr, int data_dir, int flags)
1549 {
1550         struct se_portal_group *se_tpg;
1551         int rc;
1552
1553         se_tpg = se_sess->se_tpg;
1554         BUG_ON(!se_tpg);
1555         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1556         BUG_ON(in_interrupt());
1557         /*
1558          * Initialize se_cmd for target operation.  From this point
1559          * exceptions are handled by sending exception status via
1560          * target_core_fabric_ops->queue_status() callback
1561          */
1562         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1563                                 data_length, data_dir, task_attr, sense);
1564         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1565                 se_cmd->unknown_data_length = 1;
1566         /*
1567          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1568          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1569          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1570          * kref_put() to happen during fabric packet acknowledgement.
1571          */
1572         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1573         /*
1574          * Signal bidirectional data payloads to target-core
1575          */
1576         if (flags & TARGET_SCF_BIDI_OP)
1577                 se_cmd->se_cmd_flags |= SCF_BIDI;
1578         /*
1579          * Locate se_lun pointer and attach it to struct se_cmd
1580          */
1581         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1582                 transport_send_check_condition_and_sense(se_cmd,
1583                                 se_cmd->scsi_sense_reason, 0);
1584                 target_put_sess_cmd(se_sess, se_cmd);
1585                 return;
1586         }
1587         /*
1588          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1589          * allocate the necessary tasks to complete the received CDB+data
1590          */
1591         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1592         if (rc != 0) {
1593                 transport_generic_request_failure(se_cmd);
1594                 return;
1595         }
1596
1597         /*
1598          * Check if we need to delay processing because of ALUA
1599          * Active/NonOptimized primary access state..
1600          */
1601         core_alua_check_nonop_delay(se_cmd);
1602
1603         /*
1604          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1605          * for immediate execution of READs, otherwise wait for
1606          * transport_generic_handle_data() to be called for WRITEs
1607          * when fabric has filled the incoming buffer.
1608          */
1609         transport_handle_cdb_direct(se_cmd);
1610         return;
1611 }
1612 EXPORT_SYMBOL(target_submit_cmd);
1613
1614 static void target_complete_tmr_failure(struct work_struct *work)
1615 {
1616         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1617
1618         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1619         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1620         transport_generic_free_cmd(se_cmd, 0);
1621 }
1622
1623 /**
1624  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1625  *                     for TMR CDBs
1626  *
1627  * @se_cmd: command descriptor to submit
1628  * @se_sess: associated se_sess for endpoint
1629  * @sense: pointer to SCSI sense buffer
1630  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1631  * @fabric_context: fabric context for TMR req
1632  * @tm_type: Type of TM request
1633  * @gfp: gfp type for caller
1634  * @tag: referenced task tag for TMR_ABORT_TASK
1635  * @flags: submit cmd flags
1636  *
1637  * Callable from all contexts.
1638  **/
1639
1640 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1641                 unsigned char *sense, u32 unpacked_lun,
1642                 void *fabric_tmr_ptr, unsigned char tm_type,
1643                 gfp_t gfp, unsigned int tag, int flags)
1644 {
1645         struct se_portal_group *se_tpg;
1646         int ret;
1647
1648         se_tpg = se_sess->se_tpg;
1649         BUG_ON(!se_tpg);
1650
1651         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1652                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1653         /*
1654          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1655          * allocation failure.
1656          */
1657         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1658         if (ret < 0)
1659                 return -ENOMEM;
1660
1661         if (tm_type == TMR_ABORT_TASK)
1662                 se_cmd->se_tmr_req->ref_task_tag = tag;
1663
1664         /* See target_submit_cmd for commentary */
1665         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1666
1667         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1668         if (ret) {
1669                 /*
1670                  * For callback during failure handling, push this work off
1671                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1672                  */
1673                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1674                 schedule_work(&se_cmd->work);
1675                 return 0;
1676         }
1677         transport_generic_handle_tmr(se_cmd);
1678         return 0;
1679 }
1680 EXPORT_SYMBOL(target_submit_tmr);
1681
1682 /*
1683  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1684  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1685  * complete setup in TCM process context w/ TFO->new_cmd_map().
1686  */
1687 int transport_generic_handle_cdb_map(
1688         struct se_cmd *cmd)
1689 {
1690         if (!cmd->se_lun) {
1691                 dump_stack();
1692                 pr_err("cmd->se_lun is NULL\n");
1693                 return -EINVAL;
1694         }
1695
1696         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1697         return 0;
1698 }
1699 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1700
1701 /*      transport_generic_handle_data():
1702  *
1703  *
1704  */
1705 int transport_generic_handle_data(
1706         struct se_cmd *cmd)
1707 {
1708         /*
1709          * For the software fabric case, then we assume the nexus is being
1710          * failed/shutdown when signals are pending from the kthread context
1711          * caller, so we return a failure.  For the HW target mode case running
1712          * in interrupt code, the signal_pending() check is skipped.
1713          */
1714         if (!in_interrupt() && signal_pending(current))
1715                 return -EPERM;
1716         /*
1717          * If the received CDB has aleady been ABORTED by the generic
1718          * target engine, we now call transport_check_aborted_status()
1719          * to queue any delated TASK_ABORTED status for the received CDB to the
1720          * fabric module as we are expecting no further incoming DATA OUT
1721          * sequences at this point.
1722          */
1723         if (transport_check_aborted_status(cmd, 1) != 0)
1724                 return 0;
1725
1726         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1727         return 0;
1728 }
1729 EXPORT_SYMBOL(transport_generic_handle_data);
1730
1731 /*      transport_generic_handle_tmr():
1732  *
1733  *
1734  */
1735 int transport_generic_handle_tmr(
1736         struct se_cmd *cmd)
1737 {
1738         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1739         return 0;
1740 }
1741 EXPORT_SYMBOL(transport_generic_handle_tmr);
1742
1743 /*
1744  * If the cmd is active, request it to be stopped and sleep until it
1745  * has completed.
1746  */
1747 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1748 {
1749         bool was_active = false;
1750
1751         if (cmd->transport_state & CMD_T_BUSY) {
1752                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1753                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1754
1755                 pr_debug("cmd %p waiting to complete\n", cmd);
1756                 wait_for_completion(&cmd->task_stop_comp);
1757                 pr_debug("cmd %p stopped successfully\n", cmd);
1758
1759                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1760                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1761                 cmd->transport_state &= ~CMD_T_BUSY;
1762                 was_active = true;
1763         }
1764
1765         return was_active;
1766 }
1767
1768 /*
1769  * Handle SAM-esque emulation for generic transport request failures.
1770  */
1771 void transport_generic_request_failure(struct se_cmd *cmd)
1772 {
1773         int ret = 0;
1774
1775         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1776                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1777                 cmd->t_task_cdb[0]);
1778         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1779                 cmd->se_tfo->get_cmd_state(cmd),
1780                 cmd->t_state, cmd->scsi_sense_reason);
1781         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1782                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1783                 (cmd->transport_state & CMD_T_STOP) != 0,
1784                 (cmd->transport_state & CMD_T_SENT) != 0);
1785
1786         /*
1787          * For SAM Task Attribute emulation for failed struct se_cmd
1788          */
1789         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1790                 transport_complete_task_attr(cmd);
1791
1792         switch (cmd->scsi_sense_reason) {
1793         case TCM_NON_EXISTENT_LUN:
1794         case TCM_UNSUPPORTED_SCSI_OPCODE:
1795         case TCM_INVALID_CDB_FIELD:
1796         case TCM_INVALID_PARAMETER_LIST:
1797         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1798         case TCM_UNKNOWN_MODE_PAGE:
1799         case TCM_WRITE_PROTECTED:
1800         case TCM_CHECK_CONDITION_ABORT_CMD:
1801         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1802         case TCM_CHECK_CONDITION_NOT_READY:
1803                 break;
1804         case TCM_RESERVATION_CONFLICT:
1805                 /*
1806                  * No SENSE Data payload for this case, set SCSI Status
1807                  * and queue the response to $FABRIC_MOD.
1808                  *
1809                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1810                  */
1811                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1812                 /*
1813                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1814                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1815                  * CONFLICT STATUS.
1816                  *
1817                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1818                  */
1819                 if (cmd->se_sess &&
1820                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1821                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1822                                 cmd->orig_fe_lun, 0x2C,
1823                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1824
1825                 ret = cmd->se_tfo->queue_status(cmd);
1826                 if (ret == -EAGAIN || ret == -ENOMEM)
1827                         goto queue_full;
1828                 goto check_stop;
1829         default:
1830                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1831                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1832                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1833                 break;
1834         }
1835         /*
1836          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1837          * make the call to transport_send_check_condition_and_sense()
1838          * directly.  Otherwise expect the fabric to make the call to
1839          * transport_send_check_condition_and_sense() after handling
1840          * possible unsoliticied write data payloads.
1841          */
1842         ret = transport_send_check_condition_and_sense(cmd,
1843                         cmd->scsi_sense_reason, 0);
1844         if (ret == -EAGAIN || ret == -ENOMEM)
1845                 goto queue_full;
1846
1847 check_stop:
1848         transport_lun_remove_cmd(cmd);
1849         if (!transport_cmd_check_stop_to_fabric(cmd))
1850                 ;
1851         return;
1852
1853 queue_full:
1854         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1855         transport_handle_queue_full(cmd, cmd->se_dev);
1856 }
1857 EXPORT_SYMBOL(transport_generic_request_failure);
1858
1859 static inline u32 transport_lba_21(unsigned char *cdb)
1860 {
1861         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1862 }
1863
1864 static inline u32 transport_lba_32(unsigned char *cdb)
1865 {
1866         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1867 }
1868
1869 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1870 {
1871         unsigned int __v1, __v2;
1872
1873         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1874         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1875
1876         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1877 }
1878
1879 /*
1880  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1881  */
1882 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1883 {
1884         unsigned int __v1, __v2;
1885
1886         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1887         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1888
1889         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1890 }
1891
1892 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1893 {
1894         unsigned long flags;
1895
1896         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1897         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1898         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1899 }
1900
1901 /*
1902  * Called from Fabric Module context from transport_execute_tasks()
1903  *
1904  * The return of this function determins if the tasks from struct se_cmd
1905  * get added to the execution queue in transport_execute_tasks(),
1906  * or are added to the delayed or ordered lists here.
1907  */
1908 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1909 {
1910         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1911                 return 1;
1912         /*
1913          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1914          * to allow the passed struct se_cmd list of tasks to the front of the list.
1915          */
1916          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1917                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1918                         " 0x%02x, se_ordered_id: %u\n",
1919                         cmd->t_task_cdb[0],
1920                         cmd->se_ordered_id);
1921                 return 1;
1922         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1923                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1924                 smp_mb__after_atomic_inc();
1925
1926                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1927                                 " list, se_ordered_id: %u\n",
1928                                 cmd->t_task_cdb[0],
1929                                 cmd->se_ordered_id);
1930                 /*
1931                  * Add ORDERED command to tail of execution queue if
1932                  * no other older commands exist that need to be
1933                  * completed first.
1934                  */
1935                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1936                         return 1;
1937         } else {
1938                 /*
1939                  * For SIMPLE and UNTAGGED Task Attribute commands
1940                  */
1941                 atomic_inc(&cmd->se_dev->simple_cmds);
1942                 smp_mb__after_atomic_inc();
1943         }
1944         /*
1945          * Otherwise if one or more outstanding ORDERED task attribute exist,
1946          * add the dormant task(s) built for the passed struct se_cmd to the
1947          * execution queue and become in Active state for this struct se_device.
1948          */
1949         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1950                 /*
1951                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1952                  * will be drained upon completion of HEAD_OF_QUEUE task.
1953                  */
1954                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1955                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1956                 list_add_tail(&cmd->se_delayed_node,
1957                                 &cmd->se_dev->delayed_cmd_list);
1958                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1959
1960                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1961                         " delayed CMD list, se_ordered_id: %u\n",
1962                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1963                         cmd->se_ordered_id);
1964                 /*
1965                  * Return zero to let transport_execute_tasks() know
1966                  * not to add the delayed tasks to the execution list.
1967                  */
1968                 return 0;
1969         }
1970         /*
1971          * Otherwise, no ORDERED task attributes exist..
1972          */
1973         return 1;
1974 }
1975
1976 /*
1977  * Called from fabric module context in transport_generic_new_cmd() and
1978  * transport_generic_process_write()
1979  */
1980 static void transport_execute_tasks(struct se_cmd *cmd)
1981 {
1982         int add_tasks;
1983         struct se_device *se_dev = cmd->se_dev;
1984         /*
1985          * Call transport_cmd_check_stop() to see if a fabric exception
1986          * has occurred that prevents execution.
1987          */
1988         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
1989                 /*
1990                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1991                  * attribute for the tasks of the received struct se_cmd CDB
1992                  */
1993                 add_tasks = transport_execute_task_attr(cmd);
1994                 if (add_tasks) {
1995                         __transport_execute_tasks(se_dev, cmd);
1996                         return;
1997                 }
1998         }
1999         __transport_execute_tasks(se_dev, NULL);
2000 }
2001
2002 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
2003 {
2004         int error;
2005         struct se_cmd *cmd = NULL;
2006         unsigned long flags;
2007
2008 check_depth:
2009         spin_lock_irq(&dev->execute_task_lock);
2010         if (new_cmd != NULL)
2011                 __target_add_to_execute_list(new_cmd);
2012
2013         if (list_empty(&dev->execute_list)) {
2014                 spin_unlock_irq(&dev->execute_task_lock);
2015                 return 0;
2016         }
2017         cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2018         __target_remove_from_execute_list(cmd);
2019         spin_unlock_irq(&dev->execute_task_lock);
2020
2021         spin_lock_irqsave(&cmd->t_state_lock, flags);
2022         cmd->transport_state |= CMD_T_BUSY;
2023         cmd->transport_state |= CMD_T_SENT;
2024
2025         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2026
2027         if (cmd->execute_cmd)
2028                 error = cmd->execute_cmd(cmd);
2029         else {
2030                 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2031                                 cmd->t_data_nents, cmd->data_direction);
2032         }
2033
2034         if (error != 0) {
2035                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2036                 cmd->transport_state &= ~CMD_T_BUSY;
2037                 cmd->transport_state &= ~CMD_T_SENT;
2038                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2039
2040                 transport_generic_request_failure(cmd);
2041         }
2042
2043         new_cmd = NULL;
2044         goto check_depth;
2045
2046         return 0;
2047 }
2048
2049 static inline u32 transport_get_sectors_6(
2050         unsigned char *cdb,
2051         struct se_cmd *cmd,
2052         int *ret)
2053 {
2054         struct se_device *dev = cmd->se_dev;
2055
2056         /*
2057          * Assume TYPE_DISK for non struct se_device objects.
2058          * Use 8-bit sector value.
2059          */
2060         if (!dev)
2061                 goto type_disk;
2062
2063         /*
2064          * Use 24-bit allocation length for TYPE_TAPE.
2065          */
2066         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2067                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2068
2069         /*
2070          * Everything else assume TYPE_DISK Sector CDB location.
2071          * Use 8-bit sector value.  SBC-3 says:
2072          *
2073          *   A TRANSFER LENGTH field set to zero specifies that 256
2074          *   logical blocks shall be written.  Any other value
2075          *   specifies the number of logical blocks that shall be
2076          *   written.
2077          */
2078 type_disk:
2079         return cdb[4] ? : 256;
2080 }
2081
2082 static inline u32 transport_get_sectors_10(
2083         unsigned char *cdb,
2084         struct se_cmd *cmd,
2085         int *ret)
2086 {
2087         struct se_device *dev = cmd->se_dev;
2088
2089         /*
2090          * Assume TYPE_DISK for non struct se_device objects.
2091          * Use 16-bit sector value.
2092          */
2093         if (!dev)
2094                 goto type_disk;
2095
2096         /*
2097          * XXX_10 is not defined in SSC, throw an exception
2098          */
2099         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2100                 *ret = -EINVAL;
2101                 return 0;
2102         }
2103
2104         /*
2105          * Everything else assume TYPE_DISK Sector CDB location.
2106          * Use 16-bit sector value.
2107          */
2108 type_disk:
2109         return (u32)(cdb[7] << 8) + cdb[8];
2110 }
2111
2112 static inline u32 transport_get_sectors_12(
2113         unsigned char *cdb,
2114         struct se_cmd *cmd,
2115         int *ret)
2116 {
2117         struct se_device *dev = cmd->se_dev;
2118
2119         /*
2120          * Assume TYPE_DISK for non struct se_device objects.
2121          * Use 32-bit sector value.
2122          */
2123         if (!dev)
2124                 goto type_disk;
2125
2126         /*
2127          * XXX_12 is not defined in SSC, throw an exception
2128          */
2129         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2130                 *ret = -EINVAL;
2131                 return 0;
2132         }
2133
2134         /*
2135          * Everything else assume TYPE_DISK Sector CDB location.
2136          * Use 32-bit sector value.
2137          */
2138 type_disk:
2139         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2140 }
2141
2142 static inline u32 transport_get_sectors_16(
2143         unsigned char *cdb,
2144         struct se_cmd *cmd,
2145         int *ret)
2146 {
2147         struct se_device *dev = cmd->se_dev;
2148
2149         /*
2150          * Assume TYPE_DISK for non struct se_device objects.
2151          * Use 32-bit sector value.
2152          */
2153         if (!dev)
2154                 goto type_disk;
2155
2156         /*
2157          * Use 24-bit allocation length for TYPE_TAPE.
2158          */
2159         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2160                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2161
2162 type_disk:
2163         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2164                     (cdb[12] << 8) + cdb[13];
2165 }
2166
2167 /*
2168  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2169  */
2170 static inline u32 transport_get_sectors_32(
2171         unsigned char *cdb,
2172         struct se_cmd *cmd,
2173         int *ret)
2174 {
2175         /*
2176          * Assume TYPE_DISK for non struct se_device objects.
2177          * Use 32-bit sector value.
2178          */
2179         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2180                     (cdb[30] << 8) + cdb[31];
2181
2182 }
2183
2184 static inline u32 transport_get_size(
2185         u32 sectors,
2186         unsigned char *cdb,
2187         struct se_cmd *cmd)
2188 {
2189         struct se_device *dev = cmd->se_dev;
2190
2191         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2192                 if (cdb[1] & 1) { /* sectors */
2193                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2194                 } else /* bytes */
2195                         return sectors;
2196         }
2197
2198         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2199                 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2200                 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2201                 dev->transport->name);
2202
2203         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2204 }
2205
2206 static void transport_xor_callback(struct se_cmd *cmd)
2207 {
2208         unsigned char *buf, *addr;
2209         struct scatterlist *sg;
2210         unsigned int offset;
2211         int i;
2212         int count;
2213         /*
2214          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2215          *
2216          * 1) read the specified logical block(s);
2217          * 2) transfer logical blocks from the data-out buffer;
2218          * 3) XOR the logical blocks transferred from the data-out buffer with
2219          *    the logical blocks read, storing the resulting XOR data in a buffer;
2220          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2221          *    blocks transferred from the data-out buffer; and
2222          * 5) transfer the resulting XOR data to the data-in buffer.
2223          */
2224         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2225         if (!buf) {
2226                 pr_err("Unable to allocate xor_callback buf\n");
2227                 return;
2228         }
2229         /*
2230          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2231          * into the locally allocated *buf
2232          */
2233         sg_copy_to_buffer(cmd->t_data_sg,
2234                           cmd->t_data_nents,
2235                           buf,
2236                           cmd->data_length);
2237
2238         /*
2239          * Now perform the XOR against the BIDI read memory located at
2240          * cmd->t_mem_bidi_list
2241          */
2242
2243         offset = 0;
2244         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2245                 addr = kmap_atomic(sg_page(sg));
2246                 if (!addr)
2247                         goto out;
2248
2249                 for (i = 0; i < sg->length; i++)
2250                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2251
2252                 offset += sg->length;
2253                 kunmap_atomic(addr);
2254         }
2255
2256 out:
2257         kfree(buf);
2258 }
2259
2260 /*
2261  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2262  */
2263 static int transport_get_sense_data(struct se_cmd *cmd)
2264 {
2265         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2266         struct se_device *dev = cmd->se_dev;
2267         unsigned long flags;
2268         u32 offset = 0;
2269
2270         WARN_ON(!cmd->se_lun);
2271
2272         if (!dev)
2273                 return 0;
2274
2275         spin_lock_irqsave(&cmd->t_state_lock, flags);
2276         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2277                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2278                 return 0;
2279         }
2280
2281         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2282                 goto out;
2283
2284         if (!dev->transport->get_sense_buffer) {
2285                 pr_err("dev->transport->get_sense_buffer is NULL\n");
2286                 goto out;
2287         }
2288
2289         sense_buffer = dev->transport->get_sense_buffer(cmd);
2290         if (!sense_buffer) {
2291                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2292                         " sense buffer for task with sense\n",
2293                         cmd->se_tfo->get_task_tag(cmd), cmd);
2294                 goto out;
2295         }
2296
2297         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2298
2299         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2300
2301         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2302
2303         /* Automatically padded */
2304         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2305
2306         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2307                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2308         return 0;
2309
2310 out:
2311         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2312         return -1;
2313 }
2314
2315 static inline long long transport_dev_end_lba(struct se_device *dev)
2316 {
2317         return dev->transport->get_blocks(dev) + 1;
2318 }
2319
2320 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2321 {
2322         struct se_device *dev = cmd->se_dev;
2323         u32 sectors;
2324
2325         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2326                 return 0;
2327
2328         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2329
2330         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2331                 pr_err("LBA: %llu Sectors: %u exceeds"
2332                         " transport_dev_end_lba(): %llu\n",
2333                         cmd->t_task_lba, sectors,
2334                         transport_dev_end_lba(dev));
2335                 return -EINVAL;
2336         }
2337
2338         return 0;
2339 }
2340
2341 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2342 {
2343         /*
2344          * Determine if the received WRITE_SAME is used to for direct
2345          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2346          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2347          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2348          */
2349         int passthrough = (dev->transport->transport_type ==
2350                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2351
2352         if (!passthrough) {
2353                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2354                         pr_err("WRITE_SAME PBDATA and LBDATA"
2355                                 " bits not supported for Block Discard"
2356                                 " Emulation\n");
2357                         return -ENOSYS;
2358                 }
2359                 /*
2360                  * Currently for the emulated case we only accept
2361                  * tpws with the UNMAP=1 bit set.
2362                  */
2363                 if (!(flags[0] & 0x08)) {
2364                         pr_err("WRITE_SAME w/o UNMAP bit not"
2365                                 " supported for Block Discard Emulation\n");
2366                         return -ENOSYS;
2367                 }
2368         }
2369
2370         return 0;
2371 }
2372
2373 /*      transport_generic_cmd_sequencer():
2374  *
2375  *      Generic Command Sequencer that should work for most DAS transport
2376  *      drivers.
2377  *
2378  *      Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2379  *      RX Thread.
2380  *
2381  *      FIXME: Need to support other SCSI OPCODES where as well.
2382  */
2383 static int transport_generic_cmd_sequencer(
2384         struct se_cmd *cmd,
2385         unsigned char *cdb)
2386 {
2387         struct se_device *dev = cmd->se_dev;
2388         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2389         int ret = 0, sector_ret = 0, passthrough;
2390         u32 sectors = 0, size = 0, pr_reg_type = 0;
2391         u16 service_action;
2392         u8 alua_ascq = 0;
2393         /*
2394          * Check for an existing UNIT ATTENTION condition
2395          */
2396         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2397                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2398                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2399                 return -EINVAL;
2400         }
2401         /*
2402          * Check status of Asymmetric Logical Unit Assignment port
2403          */
2404         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2405         if (ret != 0) {
2406                 /*
2407                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2408                  * The ALUA additional sense code qualifier (ASCQ) is determined
2409                  * by the ALUA primary or secondary access state..
2410                  */
2411                 if (ret > 0) {
2412                         pr_debug("[%s]: ALUA TG Port not available,"
2413                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2414                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2415
2416                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2417                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2418                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2419                         return -EINVAL;
2420                 }
2421                 goto out_invalid_cdb_field;
2422         }
2423         /*
2424          * Check status for SPC-3 Persistent Reservations
2425          */
2426         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2427                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2428                                         cmd, cdb, pr_reg_type) != 0) {
2429                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2430                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2431                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2432                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2433                         return -EBUSY;
2434                 }
2435                 /*
2436                  * This means the CDB is allowed for the SCSI Initiator port
2437                  * when said port is *NOT* holding the legacy SPC-2 or
2438                  * SPC-3 Persistent Reservation.
2439                  */
2440         }
2441
2442         /*
2443          * If we operate in passthrough mode we skip most CDB emulation and
2444          * instead hand the commands down to the physical SCSI device.
2445          */
2446         passthrough =
2447                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2448
2449         switch (cdb[0]) {
2450         case READ_6:
2451                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2452                 if (sector_ret)
2453                         goto out_unsupported_cdb;
2454                 size = transport_get_size(sectors, cdb, cmd);
2455                 cmd->t_task_lba = transport_lba_21(cdb);
2456                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2457                 break;
2458         case READ_10:
2459                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2460                 if (sector_ret)
2461                         goto out_unsupported_cdb;
2462                 size = transport_get_size(sectors, cdb, cmd);
2463                 cmd->t_task_lba = transport_lba_32(cdb);
2464                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2465                 break;
2466         case READ_12:
2467                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2468                 if (sector_ret)
2469                         goto out_unsupported_cdb;
2470                 size = transport_get_size(sectors, cdb, cmd);
2471                 cmd->t_task_lba = transport_lba_32(cdb);
2472                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2473                 break;
2474         case READ_16:
2475                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2476                 if (sector_ret)
2477                         goto out_unsupported_cdb;
2478                 size = transport_get_size(sectors, cdb, cmd);
2479                 cmd->t_task_lba = transport_lba_64(cdb);
2480                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2481                 break;
2482         case WRITE_6:
2483                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2484                 if (sector_ret)
2485                         goto out_unsupported_cdb;
2486                 size = transport_get_size(sectors, cdb, cmd);
2487                 cmd->t_task_lba = transport_lba_21(cdb);
2488                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2489                 break;
2490         case WRITE_10:
2491         case WRITE_VERIFY:
2492                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2493                 if (sector_ret)
2494                         goto out_unsupported_cdb;
2495                 size = transport_get_size(sectors, cdb, cmd);
2496                 cmd->t_task_lba = transport_lba_32(cdb);
2497                 if (cdb[1] & 0x8)
2498                         cmd->se_cmd_flags |= SCF_FUA;
2499                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2500                 break;
2501         case WRITE_12:
2502                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2503                 if (sector_ret)
2504                         goto out_unsupported_cdb;
2505                 size = transport_get_size(sectors, cdb, cmd);
2506                 cmd->t_task_lba = transport_lba_32(cdb);
2507                 if (cdb[1] & 0x8)
2508                         cmd->se_cmd_flags |= SCF_FUA;
2509                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2510                 break;
2511         case WRITE_16:
2512                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2513                 if (sector_ret)
2514                         goto out_unsupported_cdb;
2515                 size = transport_get_size(sectors, cdb, cmd);
2516                 cmd->t_task_lba = transport_lba_64(cdb);
2517                 if (cdb[1] & 0x8)
2518                         cmd->se_cmd_flags |= SCF_FUA;
2519                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2520                 break;
2521         case XDWRITEREAD_10:
2522                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2523                     !(cmd->se_cmd_flags & SCF_BIDI))
2524                         goto out_invalid_cdb_field;
2525                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2526                 if (sector_ret)
2527                         goto out_unsupported_cdb;
2528                 size = transport_get_size(sectors, cdb, cmd);
2529                 cmd->t_task_lba = transport_lba_32(cdb);
2530                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2531
2532                 /*
2533                  * Do now allow BIDI commands for passthrough mode.
2534                  */
2535                 if (passthrough)
2536                         goto out_unsupported_cdb;
2537
2538                 /*
2539                  * Setup BIDI XOR callback to be run after I/O completion.
2540                  */
2541                 cmd->transport_complete_callback = &transport_xor_callback;
2542                 if (cdb[1] & 0x8)
2543                         cmd->se_cmd_flags |= SCF_FUA;
2544                 break;
2545         case VARIABLE_LENGTH_CMD:
2546                 service_action = get_unaligned_be16(&cdb[8]);
2547                 switch (service_action) {
2548                 case XDWRITEREAD_32:
2549                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2550                         if (sector_ret)
2551                                 goto out_unsupported_cdb;
2552                         size = transport_get_size(sectors, cdb, cmd);
2553                         /*
2554                          * Use WRITE_32 and READ_32 opcodes for the emulated
2555                          * XDWRITE_READ_32 logic.
2556                          */
2557                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2558                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2559
2560                         /*
2561                          * Do now allow BIDI commands for passthrough mode.
2562                          */
2563                         if (passthrough)
2564                                 goto out_unsupported_cdb;
2565
2566                         /*
2567                          * Setup BIDI XOR callback to be run during after I/O
2568                          * completion.
2569                          */
2570                         cmd->transport_complete_callback = &transport_xor_callback;
2571                         if (cdb[1] & 0x8)
2572                                 cmd->se_cmd_flags |= SCF_FUA;
2573                         break;
2574                 case WRITE_SAME_32:
2575                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2576                         if (sector_ret)
2577                                 goto out_unsupported_cdb;
2578
2579                         if (sectors)
2580                                 size = transport_get_size(1, cdb, cmd);
2581                         else {
2582                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2583                                        " supported\n");
2584                                 goto out_invalid_cdb_field;
2585                         }
2586
2587                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2588                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2589
2590                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2591                                 goto out_unsupported_cdb;
2592                         if (!passthrough)
2593                                 cmd->execute_cmd = target_emulate_write_same;
2594                         break;
2595                 default:
2596                         pr_err("VARIABLE_LENGTH_CMD service action"
2597                                 " 0x%04x not supported\n", service_action);
2598                         goto out_unsupported_cdb;
2599                 }
2600                 break;
2601         case MAINTENANCE_IN:
2602                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2603                         /* MAINTENANCE_IN from SCC-2 */
2604                         /*
2605                          * Check for emulated MI_REPORT_TARGET_PGS.
2606                          */
2607                         if ((cdb[1] & 0x1f) == MI_REPORT_TARGET_PGS &&
2608                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2609                                 cmd->execute_cmd =
2610                                         target_emulate_report_target_port_groups;
2611                         }
2612                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2613                                (cdb[8] << 8) | cdb[9];
2614                 } else {
2615                         /* GPCMD_SEND_KEY from multi media commands */
2616                         size = (cdb[8] << 8) + cdb[9];
2617                 }
2618                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2619                 break;
2620         case MODE_SELECT:
2621                 size = cdb[4];
2622                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2623                 break;
2624         case MODE_SELECT_10:
2625                 size = (cdb[7] << 8) + cdb[8];
2626                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2627                 break;
2628         case MODE_SENSE:
2629                 size = cdb[4];
2630                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2631                 if (!passthrough)
2632                         cmd->execute_cmd = target_emulate_modesense;
2633                 break;
2634         case MODE_SENSE_10:
2635                 size = (cdb[7] << 8) + cdb[8];
2636                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2637                 if (!passthrough)
2638                         cmd->execute_cmd = target_emulate_modesense;
2639                 break;
2640         case GPCMD_READ_BUFFER_CAPACITY:
2641         case GPCMD_SEND_OPC:
2642         case LOG_SELECT:
2643         case LOG_SENSE:
2644                 size = (cdb[7] << 8) + cdb[8];
2645                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2646                 break;
2647         case READ_BLOCK_LIMITS:
2648                 size = READ_BLOCK_LEN;
2649                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2650                 break;
2651         case GPCMD_GET_CONFIGURATION:
2652         case GPCMD_READ_FORMAT_CAPACITIES:
2653         case GPCMD_READ_DISC_INFO:
2654         case GPCMD_READ_TRACK_RZONE_INFO:
2655                 size = (cdb[7] << 8) + cdb[8];
2656                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2657                 break;
2658         case PERSISTENT_RESERVE_IN:
2659                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2660                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
2661                 size = (cdb[7] << 8) + cdb[8];
2662                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2663                 break;
2664         case PERSISTENT_RESERVE_OUT:
2665                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2666                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
2667                 size = (cdb[7] << 8) + cdb[8];
2668                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2669                 break;
2670         case GPCMD_MECHANISM_STATUS:
2671         case GPCMD_READ_DVD_STRUCTURE:
2672                 size = (cdb[8] << 8) + cdb[9];
2673                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2674                 break;
2675         case READ_POSITION:
2676                 size = READ_POSITION_LEN;
2677                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2678                 break;
2679         case MAINTENANCE_OUT:
2680                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2681                         /* MAINTENANCE_OUT from SCC-2
2682                          *
2683                          * Check for emulated MO_SET_TARGET_PGS.
2684                          */
2685                         if (cdb[1] == MO_SET_TARGET_PGS &&
2686                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2687                                 cmd->execute_cmd =
2688                                         target_emulate_set_target_port_groups;
2689                         }
2690
2691                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2692                                (cdb[8] << 8) | cdb[9];
2693                 } else  {
2694                         /* GPCMD_REPORT_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 INQUIRY:
2700                 size = (cdb[3] << 8) + cdb[4];
2701                 /*
2702                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2703                  * See spc4r17 section 5.3
2704                  */
2705                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2706                         cmd->sam_task_attr = MSG_HEAD_TAG;
2707                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2708                 if (!passthrough)
2709                         cmd->execute_cmd = target_emulate_inquiry;
2710                 break;
2711         case READ_BUFFER:
2712                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2713                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2714                 break;
2715         case READ_CAPACITY:
2716                 size = READ_CAP_LEN;
2717                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2718                 if (!passthrough)
2719                         cmd->execute_cmd = target_emulate_readcapacity;
2720                 break;
2721         case READ_MEDIA_SERIAL_NUMBER:
2722         case SECURITY_PROTOCOL_IN:
2723         case SECURITY_PROTOCOL_OUT:
2724                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2725                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2726                 break;
2727         case SERVICE_ACTION_IN:
2728                 switch (cmd->t_task_cdb[1] & 0x1f) {
2729                 case SAI_READ_CAPACITY_16:
2730                         if (!passthrough)
2731                                 cmd->execute_cmd =
2732                                         target_emulate_readcapacity_16;
2733                         break;
2734                 default:
2735                         if (passthrough)
2736                                 break;
2737
2738                         pr_err("Unsupported SA: 0x%02x\n",
2739                                 cmd->t_task_cdb[1] & 0x1f);
2740                         goto out_invalid_cdb_field;
2741                 }
2742                 /*FALLTHROUGH*/
2743         case ACCESS_CONTROL_IN:
2744         case ACCESS_CONTROL_OUT:
2745         case EXTENDED_COPY:
2746         case READ_ATTRIBUTE:
2747         case RECEIVE_COPY_RESULTS:
2748         case WRITE_ATTRIBUTE:
2749                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2750                        (cdb[12] << 8) | cdb[13];
2751                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2752                 break;
2753         case RECEIVE_DIAGNOSTIC:
2754         case SEND_DIAGNOSTIC:
2755                 size = (cdb[3] << 8) | cdb[4];
2756                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2757                 break;
2758 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2759 #if 0
2760         case GPCMD_READ_CD:
2761                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2762                 size = (2336 * sectors);
2763                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2764                 break;
2765 #endif
2766         case READ_TOC:
2767                 size = cdb[8];
2768                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2769                 break;
2770         case REQUEST_SENSE:
2771                 size = cdb[4];
2772                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2773                 if (!passthrough)
2774                         cmd->execute_cmd = target_emulate_request_sense;
2775                 break;
2776         case READ_ELEMENT_STATUS:
2777                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2778                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2779                 break;
2780         case WRITE_BUFFER:
2781                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2782                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2783                 break;
2784         case RESERVE:
2785         case RESERVE_10:
2786                 /*
2787                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2788                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2789                  */
2790                 if (cdb[0] == RESERVE_10)
2791                         size = (cdb[7] << 8) | cdb[8];
2792                 else
2793                         size = cmd->data_length;
2794
2795                 /*
2796                  * Setup the legacy emulated handler for SPC-2 and
2797                  * >= SPC-3 compatible reservation handling (CRH=1)
2798                  * Otherwise, we assume the underlying SCSI logic is
2799                  * is running in SPC_PASSTHROUGH, and wants reservations
2800                  * emulation disabled.
2801                  */
2802                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2803                         cmd->execute_cmd = target_scsi2_reservation_reserve;
2804                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2805                 break;
2806         case RELEASE:
2807         case RELEASE_10:
2808                 /*
2809                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2810                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2811                 */
2812                 if (cdb[0] == RELEASE_10)
2813                         size = (cdb[7] << 8) | cdb[8];
2814                 else
2815                         size = cmd->data_length;
2816
2817                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2818                         cmd->execute_cmd = target_scsi2_reservation_release;
2819                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2820                 break;
2821         case SYNCHRONIZE_CACHE:
2822         case SYNCHRONIZE_CACHE_16:
2823                 /*
2824                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2825                  */
2826                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2827                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2828                         cmd->t_task_lba = transport_lba_32(cdb);
2829                 } else {
2830                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2831                         cmd->t_task_lba = transport_lba_64(cdb);
2832                 }
2833                 if (sector_ret)
2834                         goto out_unsupported_cdb;
2835
2836                 size = transport_get_size(sectors, cdb, cmd);
2837                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2838
2839                 if (passthrough)
2840                         break;
2841
2842                 /*
2843                  * Check to ensure that LBA + Range does not exceed past end of
2844                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2845                  */
2846                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2847                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2848                                 goto out_invalid_cdb_field;
2849                 }
2850                 cmd->execute_cmd = target_emulate_synchronize_cache;
2851                 break;
2852         case UNMAP:
2853                 size = get_unaligned_be16(&cdb[7]);
2854                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2855                 if (!passthrough)
2856                         cmd->execute_cmd = target_emulate_unmap;
2857                 break;
2858         case WRITE_SAME_16:
2859                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2860                 if (sector_ret)
2861                         goto out_unsupported_cdb;
2862
2863                 if (sectors)
2864                         size = transport_get_size(1, cdb, cmd);
2865                 else {
2866                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2867                         goto out_invalid_cdb_field;
2868                 }
2869
2870                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2871                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2872
2873                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2874                         goto out_unsupported_cdb;
2875                 if (!passthrough)
2876                         cmd->execute_cmd = target_emulate_write_same;
2877                 break;
2878         case WRITE_SAME:
2879                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2880                 if (sector_ret)
2881                         goto out_unsupported_cdb;
2882
2883                 if (sectors)
2884                         size = transport_get_size(1, cdb, cmd);
2885                 else {
2886                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2887                         goto out_invalid_cdb_field;
2888                 }
2889
2890                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2891                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2892                 /*
2893                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2894                  * of byte 1 bit 3 UNMAP instead of original reserved field
2895                  */
2896                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2897                         goto out_unsupported_cdb;
2898                 if (!passthrough)
2899                         cmd->execute_cmd = target_emulate_write_same;
2900                 break;
2901         case ALLOW_MEDIUM_REMOVAL:
2902         case ERASE:
2903         case REZERO_UNIT:
2904         case SEEK_10:
2905         case SPACE:
2906         case START_STOP:
2907         case TEST_UNIT_READY:
2908         case VERIFY:
2909         case WRITE_FILEMARKS:
2910                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2911                 if (!passthrough)
2912                         cmd->execute_cmd = target_emulate_noop;
2913                 break;
2914         case GPCMD_CLOSE_TRACK:
2915         case INITIALIZE_ELEMENT_STATUS:
2916         case GPCMD_LOAD_UNLOAD:
2917         case GPCMD_SET_SPEED:
2918         case MOVE_MEDIUM:
2919                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2920                 break;
2921         case REPORT_LUNS:
2922                 cmd->execute_cmd = target_report_luns;
2923                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2924                 /*
2925                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2926                  * See spc4r17 section 5.3
2927                  */
2928                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2929                         cmd->sam_task_attr = MSG_HEAD_TAG;
2930                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2931                 break;
2932         case GET_EVENT_STATUS_NOTIFICATION:
2933                 size = (cdb[7] << 8) | cdb[8];
2934                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2935                 break;
2936         case ATA_16:
2937                 /* Only support ATA passthrough to pSCSI backends.. */
2938                 if (!passthrough)
2939                         goto out_unsupported_cdb;
2940
2941                 /* T_LENGTH */
2942                 switch (cdb[2] & 0x3) {
2943                 case 0x0:
2944                         sectors = 0;
2945                         break;
2946                 case 0x1:
2947                         sectors = (((cdb[1] & 0x1) ? cdb[3] : 0) << 8) | cdb[4];
2948                         break;
2949                 case 0x2:
2950                         sectors = (((cdb[1] & 0x1) ? cdb[5] : 0) << 8) | cdb[6];
2951                         break;
2952                 case 0x3:
2953                         pr_err("T_LENGTH=0x3 not supported for ATA_16\n");
2954                         goto out_invalid_cdb_field;
2955                 }
2956
2957                 /* BYTE_BLOCK */
2958                 if (cdb[2] & 0x4) {
2959                         /* BLOCK T_TYPE: 512 or sector */
2960                         size = sectors * ((cdb[2] & 0x10) ?
2961                                 dev->se_sub_dev->se_dev_attrib.block_size : 512);
2962                 } else {
2963                         /* BYTE */
2964                         size = sectors;
2965                 }
2966                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2967                 break;
2968         default:
2969                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2970                         " 0x%02x, sending CHECK_CONDITION.\n",
2971                         cmd->se_tfo->get_fabric_name(), cdb[0]);
2972                 goto out_unsupported_cdb;
2973         }
2974
2975         if (cmd->unknown_data_length)
2976                 cmd->data_length = size;
2977
2978         if (size != cmd->data_length) {
2979                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2980                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2981                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
2982                                 cmd->data_length, size, cdb[0]);
2983
2984                 cmd->cmd_spdtl = size;
2985
2986                 if (cmd->data_direction == DMA_TO_DEVICE) {
2987                         pr_err("Rejecting underflow/overflow"
2988                                         " WRITE data\n");
2989                         goto out_invalid_cdb_field;
2990                 }
2991                 /*
2992                  * Reject READ_* or WRITE_* with overflow/underflow for
2993                  * type SCF_SCSI_DATA_SG_IO_CDB.
2994                  */
2995                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
2996                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2997                                 " CDB on non 512-byte sector setup subsystem"
2998                                 " plugin: %s\n", dev->transport->name);
2999                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3000                         goto out_invalid_cdb_field;
3001                 }
3002
3003                 if (size > cmd->data_length) {
3004                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3005                         cmd->residual_count = (size - cmd->data_length);
3006                 } else {
3007                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3008                         cmd->residual_count = (cmd->data_length - size);
3009                 }
3010                 cmd->data_length = size;
3011         }
3012
3013         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3014                 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
3015                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3016                                 " big sectors %u exceeds fabric_max_sectors:"
3017                                 " %u\n", cdb[0], sectors,
3018                                 su_dev->se_dev_attrib.fabric_max_sectors);
3019                         goto out_invalid_cdb_field;
3020                 }
3021                 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
3022                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
3023                                 " big sectors %u exceeds backend hw_max_sectors:"
3024                                 " %u\n", cdb[0], sectors,
3025                                 su_dev->se_dev_attrib.hw_max_sectors);
3026                         goto out_invalid_cdb_field;
3027                 }
3028         }
3029
3030         /* reject any command that we don't have a handler for */
3031         if (!(passthrough || cmd->execute_cmd ||
3032              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3033                 goto out_unsupported_cdb;
3034
3035         transport_set_supported_SAM_opcode(cmd);
3036         return ret;
3037
3038 out_unsupported_cdb:
3039         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3040         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3041         return -EINVAL;
3042 out_invalid_cdb_field:
3043         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3044         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3045         return -EINVAL;
3046 }
3047
3048 /*
3049  * Called from I/O completion to determine which dormant/delayed
3050  * and ordered cmds need to have their tasks added to the execution queue.
3051  */
3052 static void transport_complete_task_attr(struct se_cmd *cmd)
3053 {
3054         struct se_device *dev = cmd->se_dev;
3055         struct se_cmd *cmd_p, *cmd_tmp;
3056         int new_active_tasks = 0;
3057
3058         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3059                 atomic_dec(&dev->simple_cmds);
3060                 smp_mb__after_atomic_dec();
3061                 dev->dev_cur_ordered_id++;
3062                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3063                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3064                         cmd->se_ordered_id);
3065         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3066                 dev->dev_cur_ordered_id++;
3067                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3068                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3069                         cmd->se_ordered_id);
3070         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3071                 atomic_dec(&dev->dev_ordered_sync);
3072                 smp_mb__after_atomic_dec();
3073
3074                 dev->dev_cur_ordered_id++;
3075                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3076                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3077         }
3078         /*
3079          * Process all commands up to the last received
3080          * ORDERED task attribute which requires another blocking
3081          * boundary
3082          */
3083         spin_lock(&dev->delayed_cmd_lock);
3084         list_for_each_entry_safe(cmd_p, cmd_tmp,
3085                         &dev->delayed_cmd_list, se_delayed_node) {
3086
3087                 list_del(&cmd_p->se_delayed_node);
3088                 spin_unlock(&dev->delayed_cmd_lock);
3089
3090                 pr_debug("Calling add_tasks() for"
3091                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3092                         " Dormant -> Active, se_ordered_id: %u\n",
3093                         cmd_p->t_task_cdb[0],
3094                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3095
3096                 target_add_to_execute_list(cmd_p);
3097                 new_active_tasks++;
3098
3099                 spin_lock(&dev->delayed_cmd_lock);
3100                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3101                         break;
3102         }
3103         spin_unlock(&dev->delayed_cmd_lock);
3104         /*
3105          * If new tasks have become active, wake up the transport thread
3106          * to do the processing of the Active tasks.
3107          */
3108         if (new_active_tasks != 0)
3109                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3110 }
3111
3112 static void transport_complete_qf(struct se_cmd *cmd)
3113 {
3114         int ret = 0;
3115
3116         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3117                 transport_complete_task_attr(cmd);
3118
3119         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3120                 ret = cmd->se_tfo->queue_status(cmd);
3121                 if (ret)
3122                         goto out;
3123         }
3124
3125         switch (cmd->data_direction) {
3126         case DMA_FROM_DEVICE:
3127                 ret = cmd->se_tfo->queue_data_in(cmd);
3128                 break;
3129         case DMA_TO_DEVICE:
3130                 if (cmd->t_bidi_data_sg) {
3131                         ret = cmd->se_tfo->queue_data_in(cmd);
3132                         if (ret < 0)
3133                                 break;
3134                 }
3135                 /* Fall through for DMA_TO_DEVICE */
3136         case DMA_NONE:
3137                 ret = cmd->se_tfo->queue_status(cmd);
3138                 break;
3139         default:
3140                 break;
3141         }
3142
3143 out:
3144         if (ret < 0) {
3145                 transport_handle_queue_full(cmd, cmd->se_dev);
3146                 return;
3147         }
3148         transport_lun_remove_cmd(cmd);
3149         transport_cmd_check_stop_to_fabric(cmd);
3150 }
3151
3152 static void transport_handle_queue_full(
3153         struct se_cmd *cmd,
3154         struct se_device *dev)
3155 {
3156         spin_lock_irq(&dev->qf_cmd_lock);
3157         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3158         atomic_inc(&dev->dev_qf_count);
3159         smp_mb__after_atomic_inc();
3160         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3161
3162         schedule_work(&cmd->se_dev->qf_work_queue);
3163 }
3164
3165 static void target_complete_ok_work(struct work_struct *work)
3166 {
3167         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3168         int reason = 0, ret;
3169
3170         /*
3171          * Check if we need to move delayed/dormant tasks from cmds on the
3172          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3173          * Attribute.
3174          */
3175         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3176                 transport_complete_task_attr(cmd);
3177         /*
3178          * Check to schedule QUEUE_FULL work, or execute an existing
3179          * cmd->transport_qf_callback()
3180          */
3181         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3182                 schedule_work(&cmd->se_dev->qf_work_queue);
3183
3184         /*
3185          * Check if we need to retrieve a sense buffer from
3186          * the struct se_cmd in question.
3187          */
3188         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3189                 if (transport_get_sense_data(cmd) < 0)
3190                         reason = TCM_NON_EXISTENT_LUN;
3191
3192                 if (cmd->scsi_status) {
3193                         ret = transport_send_check_condition_and_sense(
3194                                         cmd, reason, 1);
3195                         if (ret == -EAGAIN || ret == -ENOMEM)
3196                                 goto queue_full;
3197
3198                         transport_lun_remove_cmd(cmd);
3199                         transport_cmd_check_stop_to_fabric(cmd);
3200                         return;
3201                 }
3202         }
3203         /*
3204          * Check for a callback, used by amongst other things
3205          * XDWRITE_READ_10 emulation.
3206          */
3207         if (cmd->transport_complete_callback)
3208                 cmd->transport_complete_callback(cmd);
3209
3210         switch (cmd->data_direction) {
3211         case DMA_FROM_DEVICE:
3212                 spin_lock(&cmd->se_lun->lun_sep_lock);
3213                 if (cmd->se_lun->lun_sep) {
3214                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3215                                         cmd->data_length;
3216                 }
3217                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3218
3219                 ret = cmd->se_tfo->queue_data_in(cmd);
3220                 if (ret == -EAGAIN || ret == -ENOMEM)
3221                         goto queue_full;
3222                 break;
3223         case DMA_TO_DEVICE:
3224                 spin_lock(&cmd->se_lun->lun_sep_lock);
3225                 if (cmd->se_lun->lun_sep) {
3226                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3227                                 cmd->data_length;
3228                 }
3229                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3230                 /*
3231                  * Check if we need to send READ payload for BIDI-COMMAND
3232                  */
3233                 if (cmd->t_bidi_data_sg) {
3234                         spin_lock(&cmd->se_lun->lun_sep_lock);
3235                         if (cmd->se_lun->lun_sep) {
3236                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3237                                         cmd->data_length;
3238                         }
3239                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3240                         ret = cmd->se_tfo->queue_data_in(cmd);
3241                         if (ret == -EAGAIN || ret == -ENOMEM)
3242                                 goto queue_full;
3243                         break;
3244                 }
3245                 /* Fall through for DMA_TO_DEVICE */
3246         case DMA_NONE:
3247                 ret = cmd->se_tfo->queue_status(cmd);
3248                 if (ret == -EAGAIN || ret == -ENOMEM)
3249                         goto queue_full;
3250                 break;
3251         default:
3252                 break;
3253         }
3254
3255         transport_lun_remove_cmd(cmd);
3256         transport_cmd_check_stop_to_fabric(cmd);
3257         return;
3258
3259 queue_full:
3260         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3261                 " data_direction: %d\n", cmd, cmd->data_direction);
3262         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3263         transport_handle_queue_full(cmd, cmd->se_dev);
3264 }
3265
3266 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3267 {
3268         struct scatterlist *sg;
3269         int count;
3270
3271         for_each_sg(sgl, sg, nents, count)
3272                 __free_page(sg_page(sg));
3273
3274         kfree(sgl);
3275 }
3276
3277 static inline void transport_free_pages(struct se_cmd *cmd)
3278 {
3279         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3280                 return;
3281
3282         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3283         cmd->t_data_sg = NULL;
3284         cmd->t_data_nents = 0;
3285
3286         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3287         cmd->t_bidi_data_sg = NULL;
3288         cmd->t_bidi_data_nents = 0;
3289 }
3290
3291 /**
3292  * transport_release_cmd - free a command
3293  * @cmd:       command to free
3294  *
3295  * This routine unconditionally frees a command, and reference counting
3296  * or list removal must be done in the caller.
3297  */
3298 static void transport_release_cmd(struct se_cmd *cmd)
3299 {
3300         BUG_ON(!cmd->se_tfo);
3301
3302         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3303                 core_tmr_release_req(cmd->se_tmr_req);
3304         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3305                 kfree(cmd->t_task_cdb);
3306         /*
3307          * If this cmd has been setup with target_get_sess_cmd(), drop
3308          * the kref and call ->release_cmd() in kref callback.
3309          */
3310          if (cmd->check_release != 0) {
3311                 target_put_sess_cmd(cmd->se_sess, cmd);
3312                 return;
3313         }
3314         cmd->se_tfo->release_cmd(cmd);
3315 }
3316
3317 /**
3318  * transport_put_cmd - release a reference to a command
3319  * @cmd:       command to release
3320  *
3321  * This routine releases our reference to the command and frees it if possible.
3322  */
3323 static void transport_put_cmd(struct se_cmd *cmd)
3324 {
3325         unsigned long flags;
3326
3327         spin_lock_irqsave(&cmd->t_state_lock, flags);
3328         if (atomic_read(&cmd->t_fe_count)) {
3329                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3330                         goto out_busy;
3331         }
3332
3333         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3334                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3335                 target_remove_from_state_list(cmd);
3336         }
3337         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3338
3339         transport_free_pages(cmd);
3340         transport_release_cmd(cmd);
3341         return;
3342 out_busy:
3343         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3344 }
3345
3346 /*
3347  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3348  * allocating in the core.
3349  * @cmd:  Associated se_cmd descriptor
3350  * @mem:  SGL style memory for TCM WRITE / READ
3351  * @sg_mem_num: Number of SGL elements
3352  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3353  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3354  *
3355  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3356  * of parameters.
3357  */
3358 int transport_generic_map_mem_to_cmd(
3359         struct se_cmd *cmd,
3360         struct scatterlist *sgl,
3361         u32 sgl_count,
3362         struct scatterlist *sgl_bidi,
3363         u32 sgl_bidi_count)
3364 {
3365         if (!sgl || !sgl_count)
3366                 return 0;
3367
3368         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3369             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3370                 /*
3371                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3372                  * scatterlists already have been set to follow what the fabric
3373                  * passes for the original expected data transfer length.
3374                  */
3375                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3376                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3377                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3378                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3379                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3380                         return -EINVAL;
3381                 }
3382
3383                 cmd->t_data_sg = sgl;
3384                 cmd->t_data_nents = sgl_count;
3385
3386                 if (sgl_bidi && sgl_bidi_count) {
3387                         cmd->t_bidi_data_sg = sgl_bidi;
3388                         cmd->t_bidi_data_nents = sgl_bidi_count;
3389                 }
3390                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3391         }
3392
3393         return 0;
3394 }
3395 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3396
3397 void *transport_kmap_data_sg(struct se_cmd *cmd)
3398 {
3399         struct scatterlist *sg = cmd->t_data_sg;
3400         struct page **pages;
3401         int i;
3402
3403         BUG_ON(!sg);
3404         /*
3405          * We need to take into account a possible offset here for fabrics like
3406          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3407          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3408          */
3409         if (!cmd->t_data_nents)
3410                 return NULL;
3411         else if (cmd->t_data_nents == 1)
3412                 return kmap(sg_page(sg)) + sg->offset;
3413
3414         /* >1 page. use vmap */
3415         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3416         if (!pages)
3417                 return NULL;
3418
3419         /* convert sg[] to pages[] */
3420         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3421                 pages[i] = sg_page(sg);
3422         }
3423
3424         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3425         kfree(pages);
3426         if (!cmd->t_data_vmap)
3427                 return NULL;
3428
3429         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3430 }
3431 EXPORT_SYMBOL(transport_kmap_data_sg);
3432
3433 void transport_kunmap_data_sg(struct se_cmd *cmd)
3434 {
3435         if (!cmd->t_data_nents) {
3436                 return;
3437         } else if (cmd->t_data_nents == 1) {
3438                 kunmap(sg_page(cmd->t_data_sg));
3439                 return;
3440         }
3441
3442         vunmap(cmd->t_data_vmap);
3443         cmd->t_data_vmap = NULL;
3444 }
3445 EXPORT_SYMBOL(transport_kunmap_data_sg);
3446
3447 static int
3448 transport_generic_get_mem(struct se_cmd *cmd)
3449 {
3450         u32 length = cmd->data_length;
3451         unsigned int nents;
3452         struct page *page;
3453         gfp_t zero_flag;
3454         int i = 0;
3455
3456         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3457         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3458         if (!cmd->t_data_sg)
3459                 return -ENOMEM;
3460
3461         cmd->t_data_nents = nents;
3462         sg_init_table(cmd->t_data_sg, nents);
3463
3464         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3465
3466         while (length) {
3467                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3468                 page = alloc_page(GFP_KERNEL | zero_flag);
3469                 if (!page)
3470                         goto out;
3471
3472                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3473                 length -= page_len;
3474                 i++;
3475         }
3476         return 0;
3477
3478 out:
3479         while (i >= 0) {
3480                 __free_page(sg_page(&cmd->t_data_sg[i]));
3481                 i--;
3482         }
3483         kfree(cmd->t_data_sg);
3484         cmd->t_data_sg = NULL;
3485         return -ENOMEM;
3486 }
3487
3488 /*
3489  * Allocate any required resources to execute the command.  For writes we
3490  * might not have the payload yet, so notify the fabric via a call to
3491  * ->write_pending instead. Otherwise place it on the execution queue.
3492  */
3493 int transport_generic_new_cmd(struct se_cmd *cmd)
3494 {
3495         struct se_device *dev = cmd->se_dev;
3496         int ret = 0;
3497
3498         /*
3499          * Determine is the TCM fabric module has already allocated physical
3500          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3501          * beforehand.
3502          */
3503         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3504             cmd->data_length) {
3505                 ret = transport_generic_get_mem(cmd);
3506                 if (ret < 0)
3507                         goto out_fail;
3508         }
3509
3510         /* Workaround for handling zero-length control CDBs */
3511         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3512             !cmd->data_length) {
3513                 spin_lock_irq(&cmd->t_state_lock);
3514                 cmd->t_state = TRANSPORT_COMPLETE;
3515                 cmd->transport_state |= CMD_T_ACTIVE;
3516                 spin_unlock_irq(&cmd->t_state_lock);
3517
3518                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3519                         u8 ua_asc = 0, ua_ascq = 0;
3520
3521                         core_scsi3_ua_clear_for_request_sense(cmd,
3522                                         &ua_asc, &ua_ascq);
3523                 }
3524
3525                 INIT_WORK(&cmd->work, target_complete_ok_work);
3526                 queue_work(target_completion_wq, &cmd->work);
3527                 return 0;
3528         }
3529
3530         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3531                 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3532
3533                 if (transport_cmd_get_valid_sectors(cmd) < 0)
3534                         return -EINVAL;
3535
3536                 BUG_ON(cmd->data_length % attr->block_size);
3537                 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3538                         attr->hw_max_sectors);
3539         }
3540
3541         atomic_inc(&cmd->t_fe_count);
3542
3543         /*
3544          * For WRITEs, let the fabric know its buffer is ready.
3545          *
3546          * The command will be added to the execution queue after its write
3547          * data has arrived.
3548          */
3549         if (cmd->data_direction == DMA_TO_DEVICE) {
3550                 target_add_to_state_list(cmd);
3551                 return transport_generic_write_pending(cmd);
3552         }
3553         /*
3554          * Everything else but a WRITE, add the command to the execution queue.
3555          */
3556         transport_execute_tasks(cmd);
3557         return 0;
3558
3559 out_fail:
3560         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3561         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3562         return -EINVAL;
3563 }
3564 EXPORT_SYMBOL(transport_generic_new_cmd);
3565
3566 /*      transport_generic_process_write():
3567  *
3568  *
3569  */
3570 void transport_generic_process_write(struct se_cmd *cmd)
3571 {
3572         transport_execute_tasks(cmd);
3573 }
3574 EXPORT_SYMBOL(transport_generic_process_write);
3575
3576 static void transport_write_pending_qf(struct se_cmd *cmd)
3577 {
3578         int ret;
3579
3580         ret = cmd->se_tfo->write_pending(cmd);
3581         if (ret == -EAGAIN || ret == -ENOMEM) {
3582                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3583                          cmd);
3584                 transport_handle_queue_full(cmd, cmd->se_dev);
3585         }
3586 }
3587
3588 static int transport_generic_write_pending(struct se_cmd *cmd)
3589 {
3590         unsigned long flags;
3591         int ret;
3592
3593         spin_lock_irqsave(&cmd->t_state_lock, flags);
3594         cmd->t_state = TRANSPORT_WRITE_PENDING;
3595         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3596
3597         /*
3598          * Clear the se_cmd for WRITE_PENDING status in order to set
3599          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3600          * from HW target mode interrupt code.  This is safe to be called
3601          * with transport_off=1 before the cmd->se_tfo->write_pending
3602          * because the se_cmd->se_lun pointer is not being cleared.
3603          */
3604         transport_cmd_check_stop(cmd, 1, 0);
3605
3606         /*
3607          * Call the fabric write_pending function here to let the
3608          * frontend know that WRITE buffers are ready.
3609          */
3610         ret = cmd->se_tfo->write_pending(cmd);
3611         if (ret == -EAGAIN || ret == -ENOMEM)
3612                 goto queue_full;
3613         else if (ret < 0)
3614                 return ret;
3615
3616         return 1;
3617
3618 queue_full:
3619         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3620         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3621         transport_handle_queue_full(cmd, cmd->se_dev);
3622         return 0;
3623 }
3624
3625 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3626 {
3627         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3628                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3629                          transport_wait_for_tasks(cmd);
3630
3631                 transport_release_cmd(cmd);
3632         } else {
3633                 if (wait_for_tasks)
3634                         transport_wait_for_tasks(cmd);
3635
3636                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3637
3638                 if (cmd->se_lun)
3639                         transport_lun_remove_cmd(cmd);
3640
3641                 transport_put_cmd(cmd);
3642         }
3643 }
3644 EXPORT_SYMBOL(transport_generic_free_cmd);
3645
3646 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3647  * @se_sess:    session to reference
3648  * @se_cmd:     command descriptor to add
3649  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3650  */
3651 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3652                         bool ack_kref)
3653 {
3654         unsigned long flags;
3655
3656         kref_init(&se_cmd->cmd_kref);
3657         /*
3658          * Add a second kref if the fabric caller is expecting to handle
3659          * fabric acknowledgement that requires two target_put_sess_cmd()
3660          * invocations before se_cmd descriptor release.
3661          */
3662         if (ack_kref == true) {
3663                 kref_get(&se_cmd->cmd_kref);
3664                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3665         }
3666
3667         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3668         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3669         se_cmd->check_release = 1;
3670         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3671 }
3672 EXPORT_SYMBOL(target_get_sess_cmd);
3673
3674 static void target_release_cmd_kref(struct kref *kref)
3675 {
3676         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3677         struct se_session *se_sess = se_cmd->se_sess;
3678         unsigned long flags;
3679
3680         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3681         if (list_empty(&se_cmd->se_cmd_list)) {
3682                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3683                 se_cmd->se_tfo->release_cmd(se_cmd);
3684                 return;
3685         }
3686         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3687                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3688                 complete(&se_cmd->cmd_wait_comp);
3689                 return;
3690         }
3691         list_del(&se_cmd->se_cmd_list);
3692         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3693
3694         se_cmd->se_tfo->release_cmd(se_cmd);
3695 }
3696
3697 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3698  * @se_sess:    session to reference
3699  * @se_cmd:     command descriptor to drop
3700  */
3701 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3702 {
3703         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3704 }
3705 EXPORT_SYMBOL(target_put_sess_cmd);
3706
3707 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3708  * @se_sess:    session to split
3709  */
3710 void target_splice_sess_cmd_list(struct se_session *se_sess)
3711 {
3712         struct se_cmd *se_cmd;
3713         unsigned long flags;
3714
3715         WARN_ON(!list_empty(&se_sess->sess_wait_list));
3716         INIT_LIST_HEAD(&se_sess->sess_wait_list);
3717
3718         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3719         se_sess->sess_tearing_down = 1;
3720
3721         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3722
3723         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3724                 se_cmd->cmd_wait_set = 1;
3725
3726         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3727 }
3728 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3729
3730 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3731  * @se_sess:    session to wait for active I/O
3732  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
3733  */
3734 void target_wait_for_sess_cmds(
3735         struct se_session *se_sess,
3736         int wait_for_tasks)
3737 {
3738         struct se_cmd *se_cmd, *tmp_cmd;
3739         bool rc = false;
3740
3741         list_for_each_entry_safe(se_cmd, tmp_cmd,
3742                                 &se_sess->sess_wait_list, se_cmd_list) {
3743                 list_del(&se_cmd->se_cmd_list);
3744
3745                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3746                         " %d\n", se_cmd, se_cmd->t_state,
3747                         se_cmd->se_tfo->get_cmd_state(se_cmd));
3748
3749                 if (wait_for_tasks) {
3750                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3751                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3752                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3753
3754                         rc = transport_wait_for_tasks(se_cmd);
3755
3756                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3757                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3758                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3759                 }
3760
3761                 if (!rc) {
3762                         wait_for_completion(&se_cmd->cmd_wait_comp);
3763                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3764                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3765                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3766                 }
3767
3768                 se_cmd->se_tfo->release_cmd(se_cmd);
3769         }
3770 }
3771 EXPORT_SYMBOL(target_wait_for_sess_cmds);
3772
3773 /*      transport_lun_wait_for_tasks():
3774  *
3775  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
3776  *      an struct se_lun to be successfully shutdown.
3777  */
3778 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3779 {
3780         unsigned long flags;
3781         int ret = 0;
3782
3783         /*
3784          * If the frontend has already requested this struct se_cmd to
3785          * be stopped, we can safely ignore this struct se_cmd.
3786          */
3787         spin_lock_irqsave(&cmd->t_state_lock, flags);
3788         if (cmd->transport_state & CMD_T_STOP) {
3789                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3790
3791                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3792                          cmd->se_tfo->get_task_tag(cmd));
3793                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3794                 transport_cmd_check_stop(cmd, 1, 0);
3795                 return -EPERM;
3796         }
3797         cmd->transport_state |= CMD_T_LUN_FE_STOP;
3798         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3799
3800         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3801
3802         // XXX: audit task_flags checks.
3803         spin_lock_irqsave(&cmd->t_state_lock, flags);
3804         if ((cmd->transport_state & CMD_T_BUSY) &&
3805             (cmd->transport_state & CMD_T_SENT)) {
3806                 if (!target_stop_cmd(cmd, &flags))
3807                         ret++;
3808                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3809         } else {
3810                 spin_unlock_irqrestore(&cmd->t_state_lock,
3811                                 flags);
3812                 target_remove_from_execute_list(cmd);
3813         }
3814
3815         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3816                         " %d\n", cmd, ret);
3817         if (!ret) {
3818                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3819                                 cmd->se_tfo->get_task_tag(cmd));
3820                 wait_for_completion(&cmd->transport_lun_stop_comp);
3821                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3822                                 cmd->se_tfo->get_task_tag(cmd));
3823         }
3824         transport_remove_cmd_from_queue(cmd);
3825
3826         return 0;
3827 }
3828
3829 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3830 {
3831         struct se_cmd *cmd = NULL;
3832         unsigned long lun_flags, cmd_flags;
3833         /*
3834          * Do exception processing and return CHECK_CONDITION status to the
3835          * Initiator Port.
3836          */
3837         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3838         while (!list_empty(&lun->lun_cmd_list)) {
3839                 cmd = list_first_entry(&lun->lun_cmd_list,
3840                        struct se_cmd, se_lun_node);
3841                 list_del_init(&cmd->se_lun_node);
3842
3843                 /*
3844                  * This will notify iscsi_target_transport.c:
3845                  * transport_cmd_check_stop() that a LUN shutdown is in
3846                  * progress for the iscsi_cmd_t.
3847                  */
3848                 spin_lock(&cmd->t_state_lock);
3849                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3850                         "_lun_stop for  ITT: 0x%08x\n",
3851                         cmd->se_lun->unpacked_lun,
3852                         cmd->se_tfo->get_task_tag(cmd));
3853                 cmd->transport_state |= CMD_T_LUN_STOP;
3854                 spin_unlock(&cmd->t_state_lock);
3855
3856                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3857
3858                 if (!cmd->se_lun) {
3859                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3860                                 cmd->se_tfo->get_task_tag(cmd),
3861                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3862                         BUG();
3863                 }
3864                 /*
3865                  * If the Storage engine still owns the iscsi_cmd_t, determine
3866                  * and/or stop its context.
3867                  */
3868                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3869                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3870                         cmd->se_tfo->get_task_tag(cmd));
3871
3872                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3873                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3874                         continue;
3875                 }
3876
3877                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3878                         "_wait_for_tasks(): SUCCESS\n",
3879                         cmd->se_lun->unpacked_lun,
3880                         cmd->se_tfo->get_task_tag(cmd));
3881
3882                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3883                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3884                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3885                         goto check_cond;
3886                 }
3887                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3888                 target_remove_from_state_list(cmd);
3889                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3890
3891                 /*
3892                  * The Storage engine stopped this struct se_cmd before it was
3893                  * send to the fabric frontend for delivery back to the
3894                  * Initiator Node.  Return this SCSI CDB back with an
3895                  * CHECK_CONDITION status.
3896                  */
3897 check_cond:
3898                 transport_send_check_condition_and_sense(cmd,
3899                                 TCM_NON_EXISTENT_LUN, 0);
3900                 /*
3901                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
3902                  * be released, notify the waiting thread now that LU has
3903                  * finished accessing it.
3904                  */
3905                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3906                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3907                         pr_debug("SE_LUN[%d] - Detected FE stop for"
3908                                 " struct se_cmd: %p ITT: 0x%08x\n",
3909                                 lun->unpacked_lun,
3910                                 cmd, cmd->se_tfo->get_task_tag(cmd));
3911
3912                         spin_unlock_irqrestore(&cmd->t_state_lock,
3913                                         cmd_flags);
3914                         transport_cmd_check_stop(cmd, 1, 0);
3915                         complete(&cmd->transport_lun_fe_stop_comp);
3916                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3917                         continue;
3918                 }
3919                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3920                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3921
3922                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3923                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3924         }
3925         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3926 }
3927
3928 static int transport_clear_lun_thread(void *p)
3929 {
3930         struct se_lun *lun = p;
3931
3932         __transport_clear_lun_from_sessions(lun);
3933         complete(&lun->lun_shutdown_comp);
3934
3935         return 0;
3936 }
3937
3938 int transport_clear_lun_from_sessions(struct se_lun *lun)
3939 {
3940         struct task_struct *kt;
3941
3942         kt = kthread_run(transport_clear_lun_thread, lun,
3943                         "tcm_cl_%u", lun->unpacked_lun);
3944         if (IS_ERR(kt)) {
3945                 pr_err("Unable to start clear_lun thread\n");
3946                 return PTR_ERR(kt);
3947         }
3948         wait_for_completion(&lun->lun_shutdown_comp);
3949
3950         return 0;
3951 }
3952
3953 /**
3954  * transport_wait_for_tasks - wait for completion to occur
3955  * @cmd:        command to wait
3956  *
3957  * Called from frontend fabric context to wait for storage engine
3958  * to pause and/or release frontend generated struct se_cmd.
3959  */
3960 bool transport_wait_for_tasks(struct se_cmd *cmd)
3961 {
3962         unsigned long flags;
3963
3964         spin_lock_irqsave(&cmd->t_state_lock, flags);
3965         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3966             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3967                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3968                 return false;
3969         }
3970         /*
3971          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3972          * has been set in transport_set_supported_SAM_opcode().
3973          */
3974         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3975             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3976                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3977                 return false;
3978         }
3979         /*
3980          * If we are already stopped due to an external event (ie: LUN shutdown)
3981          * sleep until the connection can have the passed struct se_cmd back.
3982          * The cmd->transport_lun_stopped_sem will be upped by
3983          * transport_clear_lun_from_sessions() once the ConfigFS context caller
3984          * has completed its operation on the struct se_cmd.
3985          */
3986         if (cmd->transport_state & CMD_T_LUN_STOP) {
3987                 pr_debug("wait_for_tasks: Stopping"
3988                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3989                         "_stop_comp); for ITT: 0x%08x\n",
3990                         cmd->se_tfo->get_task_tag(cmd));
3991                 /*
3992                  * There is a special case for WRITES where a FE exception +
3993                  * LUN shutdown means ConfigFS context is still sleeping on
3994                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3995                  * We go ahead and up transport_lun_stop_comp just to be sure
3996                  * here.
3997                  */
3998                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3999                 complete(&cmd->transport_lun_stop_comp);
4000                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4001                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4002
4003                 target_remove_from_state_list(cmd);
4004                 /*
4005                  * At this point, the frontend who was the originator of this
4006                  * struct se_cmd, now owns the structure and can be released through
4007                  * normal means below.
4008                  */
4009                 pr_debug("wait_for_tasks: Stopped"
4010                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4011                         "stop_comp); for ITT: 0x%08x\n",
4012                         cmd->se_tfo->get_task_tag(cmd));
4013
4014                 cmd->transport_state &= ~CMD_T_LUN_STOP;
4015         }
4016
4017         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
4018                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4019                 return false;
4020         }
4021
4022         cmd->transport_state |= CMD_T_STOP;
4023
4024         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4025                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
4026                 cmd, cmd->se_tfo->get_task_tag(cmd),
4027                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4028
4029         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4030
4031         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4032
4033         wait_for_completion(&cmd->t_transport_stop_comp);
4034
4035         spin_lock_irqsave(&cmd->t_state_lock, flags);
4036         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4037
4038         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4039                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4040                 cmd->se_tfo->get_task_tag(cmd));
4041
4042         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4043
4044         return true;
4045 }
4046 EXPORT_SYMBOL(transport_wait_for_tasks);
4047
4048 static int transport_get_sense_codes(
4049         struct se_cmd *cmd,
4050         u8 *asc,
4051         u8 *ascq)
4052 {
4053         *asc = cmd->scsi_asc;
4054         *ascq = cmd->scsi_ascq;
4055
4056         return 0;
4057 }
4058
4059 static int transport_set_sense_codes(
4060         struct se_cmd *cmd,
4061         u8 asc,
4062         u8 ascq)
4063 {
4064         cmd->scsi_asc = asc;
4065         cmd->scsi_ascq = ascq;
4066
4067         return 0;
4068 }
4069
4070 int transport_send_check_condition_and_sense(
4071         struct se_cmd *cmd,
4072         u8 reason,
4073         int from_transport)
4074 {
4075         unsigned char *buffer = cmd->sense_buffer;
4076         unsigned long flags;
4077         int offset;
4078         u8 asc = 0, ascq = 0;
4079
4080         spin_lock_irqsave(&cmd->t_state_lock, flags);
4081         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4082                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4083                 return 0;
4084         }
4085         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4086         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4087
4088         if (!reason && from_transport)
4089                 goto after_reason;
4090
4091         if (!from_transport)
4092                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4093         /*
4094          * Data Segment and SenseLength of the fabric response PDU.
4095          *
4096          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4097          * from include/scsi/scsi_cmnd.h
4098          */
4099         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4100                                 TRANSPORT_SENSE_BUFFER);
4101         /*
4102          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4103          * SENSE KEY values from include/scsi/scsi.h
4104          */
4105         switch (reason) {
4106         case TCM_NON_EXISTENT_LUN:
4107                 /* CURRENT ERROR */
4108                 buffer[offset] = 0x70;
4109                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4110                 /* ILLEGAL REQUEST */
4111                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4112                 /* LOGICAL UNIT NOT SUPPORTED */
4113                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4114                 break;
4115         case TCM_UNSUPPORTED_SCSI_OPCODE:
4116         case TCM_SECTOR_COUNT_TOO_MANY:
4117                 /* CURRENT ERROR */
4118                 buffer[offset] = 0x70;
4119                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4120                 /* ILLEGAL REQUEST */
4121                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4122                 /* INVALID COMMAND OPERATION CODE */
4123                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4124                 break;
4125         case TCM_UNKNOWN_MODE_PAGE:
4126                 /* CURRENT ERROR */
4127                 buffer[offset] = 0x70;
4128                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4129                 /* ILLEGAL REQUEST */
4130                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4131                 /* INVALID FIELD IN CDB */
4132                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4133                 break;
4134         case TCM_CHECK_CONDITION_ABORT_CMD:
4135                 /* CURRENT ERROR */
4136                 buffer[offset] = 0x70;
4137                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4138                 /* ABORTED COMMAND */
4139                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4140                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4141                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4142                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4143                 break;
4144         case TCM_INCORRECT_AMOUNT_OF_DATA:
4145                 /* CURRENT ERROR */
4146                 buffer[offset] = 0x70;
4147                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4148                 /* ABORTED COMMAND */
4149                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4150                 /* WRITE ERROR */
4151                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4152                 /* NOT ENOUGH UNSOLICITED DATA */
4153                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4154                 break;
4155         case TCM_INVALID_CDB_FIELD:
4156                 /* CURRENT ERROR */
4157                 buffer[offset] = 0x70;
4158                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4159                 /* ILLEGAL REQUEST */
4160                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4161                 /* INVALID FIELD IN CDB */
4162                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4163                 break;
4164         case TCM_INVALID_PARAMETER_LIST:
4165                 /* CURRENT ERROR */
4166                 buffer[offset] = 0x70;
4167                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4168                 /* ILLEGAL REQUEST */
4169                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4170                 /* INVALID FIELD IN PARAMETER LIST */
4171                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4172                 break;
4173         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4174                 /* CURRENT ERROR */
4175                 buffer[offset] = 0x70;
4176                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4177                 /* ABORTED COMMAND */
4178                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4179                 /* WRITE ERROR */
4180                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4181                 /* UNEXPECTED_UNSOLICITED_DATA */
4182                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4183                 break;
4184         case TCM_SERVICE_CRC_ERROR:
4185                 /* CURRENT ERROR */
4186                 buffer[offset] = 0x70;
4187                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4188                 /* ABORTED COMMAND */
4189                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4190                 /* PROTOCOL SERVICE CRC ERROR */
4191                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4192                 /* N/A */
4193                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4194                 break;
4195         case TCM_SNACK_REJECTED:
4196                 /* CURRENT ERROR */
4197                 buffer[offset] = 0x70;
4198                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4199                 /* ABORTED COMMAND */
4200                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4201                 /* READ ERROR */
4202                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4203                 /* FAILED RETRANSMISSION REQUEST */
4204                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4205                 break;
4206         case TCM_WRITE_PROTECTED:
4207                 /* CURRENT ERROR */
4208                 buffer[offset] = 0x70;
4209                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4210                 /* DATA PROTECT */
4211                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4212                 /* WRITE PROTECTED */
4213                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4214                 break;
4215         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4216                 /* CURRENT ERROR */
4217                 buffer[offset] = 0x70;
4218                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4219                 /* UNIT ATTENTION */
4220                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4221                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4222                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4223                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4224                 break;
4225         case TCM_CHECK_CONDITION_NOT_READY:
4226                 /* CURRENT ERROR */
4227                 buffer[offset] = 0x70;
4228                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4229                 /* Not Ready */
4230                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4231                 transport_get_sense_codes(cmd, &asc, &ascq);
4232                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4233                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4234                 break;
4235         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4236         default:
4237                 /* CURRENT ERROR */
4238                 buffer[offset] = 0x70;
4239                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4240                 /* ILLEGAL REQUEST */
4241                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4242                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4243                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4244                 break;
4245         }
4246         /*
4247          * This code uses linux/include/scsi/scsi.h SAM status codes!
4248          */
4249         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4250         /*
4251          * Automatically padded, this value is encoded in the fabric's
4252          * data_length response PDU containing the SCSI defined sense data.
4253          */
4254         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4255
4256 after_reason:
4257         return cmd->se_tfo->queue_status(cmd);
4258 }
4259 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4260
4261 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4262 {
4263         int ret = 0;
4264
4265         if (cmd->transport_state & CMD_T_ABORTED) {
4266                 if (!send_status ||
4267                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4268                         return 1;
4269
4270                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4271                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4272                         cmd->t_task_cdb[0],
4273                         cmd->se_tfo->get_task_tag(cmd));
4274
4275                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4276                 cmd->se_tfo->queue_status(cmd);
4277                 ret = 1;
4278         }
4279         return ret;
4280 }
4281 EXPORT_SYMBOL(transport_check_aborted_status);
4282
4283 void transport_send_task_abort(struct se_cmd *cmd)
4284 {
4285         unsigned long flags;
4286
4287         spin_lock_irqsave(&cmd->t_state_lock, flags);
4288         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4289                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4290                 return;
4291         }
4292         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4293
4294         /*
4295          * If there are still expected incoming fabric WRITEs, we wait
4296          * until until they have completed before sending a TASK_ABORTED
4297          * response.  This response with TASK_ABORTED status will be
4298          * queued back to fabric module by transport_check_aborted_status().
4299          */
4300         if (cmd->data_direction == DMA_TO_DEVICE) {
4301                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4302                         cmd->transport_state |= CMD_T_ABORTED;
4303                         smp_mb__after_atomic_inc();
4304                 }
4305         }
4306         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4307
4308         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4309                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4310                 cmd->se_tfo->get_task_tag(cmd));
4311
4312         cmd->se_tfo->queue_status(cmd);
4313 }
4314
4315 static int transport_generic_do_tmr(struct se_cmd *cmd)
4316 {
4317         struct se_device *dev = cmd->se_dev;
4318         struct se_tmr_req *tmr = cmd->se_tmr_req;
4319         int ret;
4320
4321         switch (tmr->function) {
4322         case TMR_ABORT_TASK:
4323                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
4324                 break;
4325         case TMR_ABORT_TASK_SET:
4326         case TMR_CLEAR_ACA:
4327         case TMR_CLEAR_TASK_SET:
4328                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4329                 break;
4330         case TMR_LUN_RESET:
4331                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4332                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4333                                          TMR_FUNCTION_REJECTED;
4334                 break;
4335         case TMR_TARGET_WARM_RESET:
4336                 tmr->response = TMR_FUNCTION_REJECTED;
4337                 break;
4338         case TMR_TARGET_COLD_RESET:
4339                 tmr->response = TMR_FUNCTION_REJECTED;
4340                 break;
4341         default:
4342                 pr_err("Uknown TMR function: 0x%02x.\n",
4343                                 tmr->function);
4344                 tmr->response = TMR_FUNCTION_REJECTED;
4345                 break;
4346         }
4347
4348         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4349         cmd->se_tfo->queue_tm_rsp(cmd);
4350
4351         transport_cmd_check_stop_to_fabric(cmd);
4352         return 0;
4353 }
4354
4355 /*      transport_processing_thread():
4356  *
4357  *
4358  */
4359 static int transport_processing_thread(void *param)
4360 {
4361         int ret;
4362         struct se_cmd *cmd;
4363         struct se_device *dev = param;
4364
4365         while (!kthread_should_stop()) {
4366                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4367                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4368                                 kthread_should_stop());
4369                 if (ret < 0)
4370                         goto out;
4371
4372 get_cmd:
4373                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4374                 if (!cmd)
4375                         continue;
4376
4377                 switch (cmd->t_state) {
4378                 case TRANSPORT_NEW_CMD:
4379                         BUG();
4380                         break;
4381                 case TRANSPORT_NEW_CMD_MAP:
4382                         if (!cmd->se_tfo->new_cmd_map) {
4383                                 pr_err("cmd->se_tfo->new_cmd_map is"
4384                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4385                                 BUG();
4386                         }
4387                         ret = cmd->se_tfo->new_cmd_map(cmd);
4388                         if (ret < 0) {
4389                                 transport_generic_request_failure(cmd);
4390                                 break;
4391                         }
4392                         ret = transport_generic_new_cmd(cmd);
4393                         if (ret < 0) {
4394                                 transport_generic_request_failure(cmd);
4395                                 break;
4396                         }
4397                         break;
4398                 case TRANSPORT_PROCESS_WRITE:
4399                         transport_generic_process_write(cmd);
4400                         break;
4401                 case TRANSPORT_PROCESS_TMR:
4402                         transport_generic_do_tmr(cmd);
4403                         break;
4404                 case TRANSPORT_COMPLETE_QF_WP:
4405                         transport_write_pending_qf(cmd);
4406                         break;
4407                 case TRANSPORT_COMPLETE_QF_OK:
4408                         transport_complete_qf(cmd);
4409                         break;
4410                 default:
4411                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4412                                 "i_state: %d on SE LUN: %u\n",
4413                                 cmd->t_state,
4414                                 cmd->se_tfo->get_task_tag(cmd),
4415                                 cmd->se_tfo->get_cmd_state(cmd),
4416                                 cmd->se_lun->unpacked_lun);
4417                         BUG();
4418                 }
4419
4420                 goto get_cmd;
4421         }
4422
4423 out:
4424         WARN_ON(!list_empty(&dev->state_list));
4425         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4426         dev->process_thread = NULL;
4427         return 0;
4428 }