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 static 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         kref_put(&se_sess->sess_kref, target_release_session);
 336 }
 337 EXPORT_SYMBOL(target_put_session);
 338
 339 static void target_complete_nacl(struct kref *kref)
 340 {
 341         struct se_node_acl *nacl = container_of(kref,
 342                                 struct se_node_acl, acl_kref);
 343
 344         complete(&nacl->acl_free_comp);
 345 }
 346
 347 void target_put_nacl(struct se_node_acl *nacl)
 348 {
 349         kref_put(&nacl->acl_kref, target_complete_nacl);
 350 }
 351
 352 void transport_deregister_session_configfs(struct se_session *se_sess)
 353 {
 354         struct se_node_acl *se_nacl;
 355         unsigned long flags;
 356         /*
 357          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 358          */
 359         se_nacl = se_sess->se_node_acl;
 360         if (se_nacl) {
 361                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 362                 if (se_nacl->acl_stop == 0)
 363                         list_del(&se_sess->sess_acl_list);
 364                 /*
 365                  * If the session list is empty, then clear the pointer.
 366                  * Otherwise, set the struct se_session pointer from the tail
 367                  * element of the per struct se_node_acl active session list.
 368                  */
 369                 if (list_empty(&se_nacl->acl_sess_list))
 370                         se_nacl->nacl_sess = NULL;
 371                 else {
 372                         se_nacl->nacl_sess = container_of(
 373                                         se_nacl->acl_sess_list.prev,
 374                                         struct se_session, sess_acl_list);
 375                 }
 376                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 377         }
 378 }
 379 EXPORT_SYMBOL(transport_deregister_session_configfs);
 380
 381 void transport_free_session(struct se_session *se_sess)
 382 {
 383         kmem_cache_free(se_sess_cache, se_sess);
 384 }
 385 EXPORT_SYMBOL(transport_free_session);
 386
 387 void transport_deregister_session(struct se_session *se_sess)
 388 {
 389         struct se_portal_group *se_tpg = se_sess->se_tpg;
 390         struct target_core_fabric_ops *se_tfo;
 391         struct se_node_acl *se_nacl;
 392         unsigned long flags;
 393         bool comp_nacl = true;
 394
 395         if (!se_tpg) {
 396                 transport_free_session(se_sess);
 397                 return;
 398         }
 399         se_tfo = se_tpg->se_tpg_tfo;
 400
 401         spin_lock_irqsave(&se_tpg->session_lock, flags);
 402         list_del(&se_sess->sess_list);
 403         se_sess->se_tpg = NULL;
 404         se_sess->fabric_sess_ptr = NULL;
 405         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 406
 407         /*
 408          * Determine if we need to do extra work for this initiator node's
 409          * struct se_node_acl if it had been previously dynamically generated.
 410          */
 411         se_nacl = se_sess->se_node_acl;
 412
 413         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 414         if (se_nacl && se_nacl->dynamic_node_acl) {
 415                 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 416                         list_del(&se_nacl->acl_list);
 417                         se_tpg->num_node_acls--;
 418                         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 419                         core_tpg_wait_for_nacl_pr_ref(se_nacl);
 420                         core_free_device_list_for_node(se_nacl, se_tpg);
 421                         se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 422
 423                         comp_nacl = false;
 424                         spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 425                 }
 426         }
 427         spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 428
 429         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 430                 se_tpg->se_tpg_tfo->get_fabric_name());
 431         /*
 432          * If last kref is dropping now for an explict NodeACL, awake sleeping
 433          * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 434          * removal context.
 435          */
 436         if (se_nacl && comp_nacl == true)
 437                 target_put_nacl(se_nacl);
 438
 439         transport_free_session(se_sess);
 440 }
 441 EXPORT_SYMBOL(transport_deregister_session);
 442
 443 /*
 444  * Called with cmd->t_state_lock held.
 445  */
 446 static void target_remove_from_state_list(struct se_cmd *cmd)
 447 {
 448         struct se_device *dev = cmd->se_dev;
 449         unsigned long flags;
 450
 451         if (!dev)
 452                 return;
 453
 454         if (cmd->transport_state & CMD_T_BUSY)
 455                 return;
 456
 457         spin_lock_irqsave(&dev->execute_task_lock, flags);
 458         if (cmd->state_active) {
 459                 list_del(&cmd->state_list);
 460                 cmd->state_active = false;
 461         }
 462         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 463 }
 464
 465 /*      transport_cmd_check_stop():
 466  *
 467  *      'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
 468  *      'transport_off = 2' determines if task_dev_state should be removed.
 469  *
 470  *      A non-zero u8 t_state sets cmd->t_state.
 471  *      Returns 1 when command is stopped, else 0.
 472  */
 473 static int transport_cmd_check_stop(
 474         struct se_cmd *cmd,
 475         int transport_off,
 476         u8 t_state)
 477 {
 478         unsigned long flags;
 479
 480         spin_lock_irqsave(&cmd->t_state_lock, flags);
 481         /*
 482          * Determine if IOCTL context caller in requesting the stopping of this
 483          * command for LUN shutdown purposes.
 484          */
 485         if (cmd->transport_state & CMD_T_LUN_STOP) {
 486                 pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 487                         __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 488
 489                 cmd->transport_state &= ~CMD_T_ACTIVE;
 490                 if (transport_off == 2)
 491                         target_remove_from_state_list(cmd);
 492                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 493
 494                 complete(&cmd->transport_lun_stop_comp);
 495                 return 1;
 496         }
 497         /*
 498          * Determine if frontend context caller is requesting the stopping of
 499          * this command for frontend exceptions.
 500          */
 501         if (cmd->transport_state & CMD_T_STOP) {
 502                 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 503                         __func__, __LINE__,
 504                         cmd->se_tfo->get_task_tag(cmd));
 505
 506                 if (transport_off == 2)
 507                         target_remove_from_state_list(cmd);
 508
 509                 /*
 510                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 511                  * to FE.
 512                  */
 513                 if (transport_off == 2)
 514                         cmd->se_lun = NULL;
 515                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 516
 517                 complete(&cmd->t_transport_stop_comp);
 518                 return 1;
 519         }
 520         if (transport_off) {
 521                 cmd->transport_state &= ~CMD_T_ACTIVE;
 522                 if (transport_off == 2) {
 523                         target_remove_from_state_list(cmd);
 524                         /*
 525                          * Clear struct se_cmd->se_lun before the transport_off == 2
 526                          * handoff to fabric module.
 527                          */
 528                         cmd->se_lun = NULL;
 529                         /*
 530                          * Some fabric modules like tcm_loop can release
 531                          * their internally allocated I/O reference now and
 532                          * struct se_cmd now.
 533                          *
 534                          * Fabric modules are expected to return '1' here if the
 535                          * se_cmd being passed is released at this point,
 536                          * or zero if not being released.
 537                          */
 538                         if (cmd->se_tfo->check_stop_free != NULL) {
 539                                 spin_unlock_irqrestore(
 540                                         &cmd->t_state_lock, flags);
 541
 542                                 return cmd->se_tfo->check_stop_free(cmd);
 543                         }
 544                 }
 545                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 546
 547                 return 0;
 548         } else if (t_state)
 549                 cmd->t_state = t_state;
 550         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 551
 552         return 0;
 553 }
 554
 555 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 556 {
 557         return transport_cmd_check_stop(cmd, 2, 0);
 558 }
 559
 560 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 561 {
 562         struct se_lun *lun = cmd->se_lun;
 563         unsigned long flags;
 564
 565         if (!lun)
 566                 return;
 567
 568         spin_lock_irqsave(&cmd->t_state_lock, flags);
 569         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 570                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 571                 target_remove_from_state_list(cmd);
 572         }
 573         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 574
 575         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 576         if (!list_empty(&cmd->se_lun_node))
 577                 list_del_init(&cmd->se_lun_node);
 578         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 579 }
 580
 581 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 582 {
 583         if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 584                 transport_lun_remove_cmd(cmd);
 585
 586         if (transport_cmd_check_stop_to_fabric(cmd))
 587                 return;
 588         if (remove) {
 589                 transport_remove_cmd_from_queue(cmd);
 590                 transport_put_cmd(cmd);
 591         }
 592 }
 593
 594 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 595                 bool at_head)
 596 {
 597         struct se_device *dev = cmd->se_dev;
 598         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 599         unsigned long flags;
 600
 601         if (t_state) {
 602                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 603                 cmd->t_state = t_state;
 604                 cmd->transport_state |= CMD_T_ACTIVE;
 605                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 606         }
 607
 608         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 609
 610         /* If the cmd is already on the list, remove it before we add it */
 611         if (!list_empty(&cmd->se_queue_node))
 612                 list_del(&cmd->se_queue_node);
 613         else
 614                 atomic_inc(&qobj->queue_cnt);
 615
 616         if (at_head)
 617                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 618         else
 619                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 620         cmd->transport_state |= CMD_T_QUEUED;
 621         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 622
 623         wake_up_interruptible(&qobj->thread_wq);
 624 }
 625
 626 static struct se_cmd *
 627 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 628 {
 629         struct se_cmd *cmd;
 630         unsigned long flags;
 631
 632         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 633         if (list_empty(&qobj->qobj_list)) {
 634                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 635                 return NULL;
 636         }
 637         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 638
 639         cmd->transport_state &= ~CMD_T_QUEUED;
 640         list_del_init(&cmd->se_queue_node);
 641         atomic_dec(&qobj->queue_cnt);
 642         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 643
 644         return cmd;
 645 }
 646
 647 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 648 {
 649         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 650         unsigned long flags;
 651
 652         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 653         if (!(cmd->transport_state & CMD_T_QUEUED)) {
 654                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 655                 return;
 656         }
 657         cmd->transport_state &= ~CMD_T_QUEUED;
 658         atomic_dec(&qobj->queue_cnt);
 659         list_del_init(&cmd->se_queue_node);
 660         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 661 }
 662
 663 static void target_complete_failure_work(struct work_struct *work)
 664 {
 665         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 666
 667         transport_generic_request_failure(cmd);
 668 }
 669
 670 void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 671 {
 672         struct se_device *dev = cmd->se_dev;
 673         int success = scsi_status == GOOD;
 674         unsigned long flags;
 675
 676         cmd->scsi_status = scsi_status;
 677
 678
 679         spin_lock_irqsave(&cmd->t_state_lock, flags);
 680         cmd->transport_state &= ~CMD_T_BUSY;
 681
 682         if (dev && dev->transport->transport_complete) {
 683                 if (dev->transport->transport_complete(cmd,
 684                                 cmd->t_data_sg) != 0) {
 685                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 686                         success = 1;
 687                 }
 688         }
 689
 690         /*
 691          * See if we are waiting to complete for an exception condition.
 692          */
 693         if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 694                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 695                 complete(&cmd->task_stop_comp);
 696                 return;
 697         }
 698
 699         if (!success)
 700                 cmd->transport_state |= CMD_T_FAILED;
 701
 702         /*
 703          * Check for case where an explict ABORT_TASK has been received
 704          * and transport_wait_for_tasks() will be waiting for completion..
 705          */
 706         if (cmd->transport_state & CMD_T_ABORTED &&
 707             cmd->transport_state & CMD_T_STOP) {
 708                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 709                 complete(&cmd->t_transport_stop_comp);
 710                 return;
 711         } else if (cmd->transport_state & CMD_T_FAILED) {
 712                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 713                 INIT_WORK(&cmd->work, target_complete_failure_work);
 714         } else {
 715                 INIT_WORK(&cmd->work, target_complete_ok_work);
 716         }
 717
 718         cmd->t_state = TRANSPORT_COMPLETE;
 719         cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 720         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 721
 722         queue_work(target_completion_wq, &cmd->work);
 723 }
 724 EXPORT_SYMBOL(target_complete_cmd);
 725
 726 static void target_add_to_state_list(struct se_cmd *cmd)
 727 {
 728         struct se_device *dev = cmd->se_dev;
 729         unsigned long flags;
 730
 731         spin_lock_irqsave(&dev->execute_task_lock, flags);
 732         if (!cmd->state_active) {
 733                 list_add_tail(&cmd->state_list, &dev->state_list);
 734                 cmd->state_active = true;
 735         }
 736         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 737 }
 738
 739 static void __target_add_to_execute_list(struct se_cmd *cmd)
 740 {
 741         struct se_device *dev = cmd->se_dev;
 742         bool head_of_queue = false;
 743
 744         if (!list_empty(&cmd->execute_list))
 745                 return;
 746
 747         if (dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED &&
 748             cmd->sam_task_attr == MSG_HEAD_TAG)
 749                 head_of_queue = true;
 750
 751         if (head_of_queue)
 752                 list_add(&cmd->execute_list, &dev->execute_list);
 753         else
 754                 list_add_tail(&cmd->execute_list, &dev->execute_list);
 755
 756         atomic_inc(&dev->execute_tasks);
 757
 758         if (cmd->state_active)
 759                 return;
 760
 761         if (head_of_queue)
 762                 list_add(&cmd->state_list, &dev->state_list);
 763         else
 764                 list_add_tail(&cmd->state_list, &dev->state_list);
 765
 766         cmd->state_active = true;
 767 }
 768
 769 static void target_add_to_execute_list(struct se_cmd *cmd)
 770 {
 771         unsigned long flags;
 772         struct se_device *dev = cmd->se_dev;
 773
 774         spin_lock_irqsave(&dev->execute_task_lock, flags);
 775         __target_add_to_execute_list(cmd);
 776         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 777 }
 778
 779 void __target_remove_from_execute_list(struct se_cmd *cmd)
 780 {
 781         list_del_init(&cmd->execute_list);
 782         atomic_dec(&cmd->se_dev->execute_tasks);
 783 }
 784
 785 static void target_remove_from_execute_list(struct se_cmd *cmd)
 786 {
 787         struct se_device *dev = cmd->se_dev;
 788         unsigned long flags;
 789
 790         if (WARN_ON(list_empty(&cmd->execute_list)))
 791                 return;
 792
 793         spin_lock_irqsave(&dev->execute_task_lock, flags);
 794         __target_remove_from_execute_list(cmd);
 795         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 796 }
 797
 798 /*
 799  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 800  */
 801
 802 static void target_qf_do_work(struct work_struct *work)
 803 {
 804         struct se_device *dev = container_of(work, struct se_device,
 805                                         qf_work_queue);
 806         LIST_HEAD(qf_cmd_list);
 807         struct se_cmd *cmd, *cmd_tmp;
 808
 809         spin_lock_irq(&dev->qf_cmd_lock);
 810         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 811         spin_unlock_irq(&dev->qf_cmd_lock);
 812
 813         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 814                 list_del(&cmd->se_qf_node);
 815                 atomic_dec(&dev->dev_qf_count);
 816                 smp_mb__after_atomic_dec();
 817
 818                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 819                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 820                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 821                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 822                         : "UNKNOWN");
 823
 824                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 825         }
 826 }
 827
 828 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 829 {
 830         switch (cmd->data_direction) {
 831         case DMA_NONE:
 832                 return "NONE";
 833         case DMA_FROM_DEVICE:
 834                 return "READ";
 835         case DMA_TO_DEVICE:
 836                 return "WRITE";
 837         case DMA_BIDIRECTIONAL:
 838                 return "BIDI";
 839         default:
 840                 break;
 841         }
 842
 843         return "UNKNOWN";
 844 }
 845
 846 void transport_dump_dev_state(
 847         struct se_device *dev,
 848         char *b,
 849         int *bl)
 850 {
 851         *bl += sprintf(b + *bl, "Status: ");
 852         switch (dev->dev_status) {
 853         case TRANSPORT_DEVICE_ACTIVATED:
 854                 *bl += sprintf(b + *bl, "ACTIVATED");
 855                 break;
 856         case TRANSPORT_DEVICE_DEACTIVATED:
 857                 *bl += sprintf(b + *bl, "DEACTIVATED");
 858                 break;
 859         case TRANSPORT_DEVICE_SHUTDOWN:
 860                 *bl += sprintf(b + *bl, "SHUTDOWN");
 861                 break;
 862         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 863         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 864                 *bl += sprintf(b + *bl, "OFFLINE");
 865                 break;
 866         default:
 867                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 868                 break;
 869         }
 870
 871         *bl += sprintf(b + *bl, "  Execute/Max Queue Depth: %d/%d",
 872                 atomic_read(&dev->execute_tasks), dev->queue_depth);
 873         *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 874                 dev->se_sub_dev->se_dev_attrib.block_size,
 875                 dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 876         *bl += sprintf(b + *bl, "        ");
 877 }
 878
 879 void transport_dump_vpd_proto_id(
 880         struct t10_vpd *vpd,
 881         unsigned char *p_buf,
 882         int p_buf_len)
 883 {
 884         unsigned char buf[VPD_TMP_BUF_SIZE];
 885         int len;
 886
 887         memset(buf, 0, VPD_TMP_BUF_SIZE);
 888         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 889
 890         switch (vpd->protocol_identifier) {
 891         case 0x00:
 892                 sprintf(buf+len, "Fibre Channel\n");
 893                 break;
 894         case 0x10:
 895                 sprintf(buf+len, "Parallel SCSI\n");
 896                 break;
 897         case 0x20:
 898                 sprintf(buf+len, "SSA\n");
 899                 break;
 900         case 0x30:
 901                 sprintf(buf+len, "IEEE 1394\n");
 902                 break;
 903         case 0x40:
 904                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 905                                 " Protocol\n");
 906                 break;
 907         case 0x50:
 908                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 909                 break;
 910         case 0x60:
 911                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 912                 break;
 913         case 0x70:
 914                 sprintf(buf+len, "Automation/Drive Interface Transport"
 915                                 " Protocol\n");
 916                 break;
 917         case 0x80:
 918                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 919                 break;
 920         default:
 921                 sprintf(buf+len, "Unknown 0x%02x\n",
 922                                 vpd->protocol_identifier);
 923                 break;
 924         }
 925
 926         if (p_buf)
 927                 strncpy(p_buf, buf, p_buf_len);
 928         else
 929                 pr_debug("%s", buf);
 930 }
 931
 932 void
 933 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 934 {
 935         /*
 936          * Check if the Protocol Identifier Valid (PIV) bit is set..
 937          *
 938          * from spc3r23.pdf section 7.5.1
 939          */
 940          if (page_83[1] & 0x80) {
 941                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 942                 vpd->protocol_identifier_set = 1;
 943                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 944         }
 945 }
 946 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 947
 948 int transport_dump_vpd_assoc(
 949         struct t10_vpd *vpd,
 950         unsigned char *p_buf,
 951         int p_buf_len)
 952 {
 953         unsigned char buf[VPD_TMP_BUF_SIZE];
 954         int ret = 0;
 955         int len;
 956
 957         memset(buf, 0, VPD_TMP_BUF_SIZE);
 958         len = sprintf(buf, "T10 VPD Identifier Association: ");
 959
 960         switch (vpd->association) {
 961         case 0x00:
 962                 sprintf(buf+len, "addressed logical unit\n");
 963                 break;
 964         case 0x10:
 965                 sprintf(buf+len, "target port\n");
 966                 break;
 967         case 0x20:
 968                 sprintf(buf+len, "SCSI target device\n");
 969                 break;
 970         default:
 971                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 972                 ret = -EINVAL;
 973                 break;
 974         }
 975
 976         if (p_buf)
 977                 strncpy(p_buf, buf, p_buf_len);
 978         else
 979                 pr_debug("%s", buf);
 980
 981         return ret;
 982 }
 983
 984 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 985 {
 986         /*
 987          * The VPD identification association..
 988          *
 989          * from spc3r23.pdf Section 7.6.3.1 Table 297
 990          */
 991         vpd->association = (page_83[1] & 0x30);
 992         return transport_dump_vpd_assoc(vpd, NULL, 0);
 993 }
 994 EXPORT_SYMBOL(transport_set_vpd_assoc);
 995
 996 int transport_dump_vpd_ident_type(
 997         struct t10_vpd *vpd,
 998         unsigned char *p_buf,
 999         int p_buf_len)
1000 {
1001         unsigned char buf[VPD_TMP_BUF_SIZE];
1002         int ret = 0;
1003         int len;
1004
1005         memset(buf, 0, VPD_TMP_BUF_SIZE);
1006         len = sprintf(buf, "T10 VPD Identifier Type: ");
1007
1008         switch (vpd->device_identifier_type) {
1009         case 0x00:
1010                 sprintf(buf+len, "Vendor specific\n");
1011                 break;
1012         case 0x01:
1013                 sprintf(buf+len, "T10 Vendor ID based\n");
1014                 break;
1015         case 0x02:
1016                 sprintf(buf+len, "EUI-64 based\n");
1017                 break;
1018         case 0x03:
1019                 sprintf(buf+len, "NAA\n");
1020                 break;
1021         case 0x04:
1022                 sprintf(buf+len, "Relative target port identifier\n");
1023                 break;
1024         case 0x08:
1025                 sprintf(buf+len, "SCSI name string\n");
1026                 break;
1027         default:
1028                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1029                                 vpd->device_identifier_type);
1030                 ret = -EINVAL;
1031                 break;
1032         }
1033
1034         if (p_buf) {
1035                 if (p_buf_len < strlen(buf)+1)
1036                         return -EINVAL;
1037                 strncpy(p_buf, buf, p_buf_len);
1038         } else {
1039                 pr_debug("%s", buf);
1040         }
1041
1042         return ret;
1043 }
1044
1045 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1046 {
1047         /*
1048          * The VPD identifier type..
1049          *
1050          * from spc3r23.pdf Section 7.6.3.1 Table 298
1051          */
1052         vpd->device_identifier_type = (page_83[1] & 0x0f);
1053         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1054 }
1055 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1056
1057 int transport_dump_vpd_ident(
1058         struct t10_vpd *vpd,
1059         unsigned char *p_buf,
1060         int p_buf_len)
1061 {
1062         unsigned char buf[VPD_TMP_BUF_SIZE];
1063         int ret = 0;
1064
1065         memset(buf, 0, VPD_TMP_BUF_SIZE);
1066
1067         switch (vpd->device_identifier_code_set) {
1068         case 0x01: /* Binary */
1069                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1070                         &vpd->device_identifier[0]);
1071                 break;
1072         case 0x02: /* ASCII */
1073                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1074                         &vpd->device_identifier[0]);
1075                 break;
1076         case 0x03: /* UTF-8 */
1077                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1078                         &vpd->device_identifier[0]);
1079                 break;
1080         default:
1081                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1082                         " 0x%02x", vpd->device_identifier_code_set);
1083                 ret = -EINVAL;
1084                 break;
1085         }
1086
1087         if (p_buf)
1088                 strncpy(p_buf, buf, p_buf_len);
1089         else
1090                 pr_debug("%s", buf);
1091
1092         return ret;
1093 }
1094
1095 int
1096 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1097 {
1098         static const char hex_str[] = "0123456789abcdef";
1099         int j = 0, i = 4; /* offset to start of the identifer */
1100
1101         /*
1102          * The VPD Code Set (encoding)
1103          *
1104          * from spc3r23.pdf Section 7.6.3.1 Table 296
1105          */
1106         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1107         switch (vpd->device_identifier_code_set) {
1108         case 0x01: /* Binary */
1109                 vpd->device_identifier[j++] =
1110                                 hex_str[vpd->device_identifier_type];
1111                 while (i < (4 + page_83[3])) {
1112                         vpd->device_identifier[j++] =
1113                                 hex_str[(page_83[i] & 0xf0) >> 4];
1114                         vpd->device_identifier[j++] =
1115                                 hex_str[page_83[i] & 0x0f];
1116                         i++;
1117                 }
1118                 break;
1119         case 0x02: /* ASCII */
1120         case 0x03: /* UTF-8 */
1121                 while (i < (4 + page_83[3]))
1122                         vpd->device_identifier[j++] = page_83[i++];
1123                 break;
1124         default:
1125                 break;
1126         }
1127
1128         return transport_dump_vpd_ident(vpd, NULL, 0);
1129 }
1130 EXPORT_SYMBOL(transport_set_vpd_ident);
1131
1132 static void core_setup_task_attr_emulation(struct se_device *dev)
1133 {
1134         /*
1135          * If this device is from Target_Core_Mod/pSCSI, disable the
1136          * SAM Task Attribute emulation.
1137          *
1138          * This is currently not available in upsream Linux/SCSI Target
1139          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1140          */
1141         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1142                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1143                 return;
1144         }
1145
1146         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1147         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1148                 " device\n", dev->transport->name,
1149                 dev->transport->get_device_rev(dev));
1150 }
1151
1152 static void scsi_dump_inquiry(struct se_device *dev)
1153 {
1154         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1155         char buf[17];
1156         int i, device_type;
1157         /*
1158          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1159          */
1160         for (i = 0; i < 8; i++)
1161                 if (wwn->vendor[i] >= 0x20)
1162                         buf[i] = wwn->vendor[i];
1163                 else
1164                         buf[i] = ' ';
1165         buf[i] = '\0';
1166         pr_debug("  Vendor: %s\n", buf);
1167
1168         for (i = 0; i < 16; i++)
1169                 if (wwn->model[i] >= 0x20)
1170                         buf[i] = wwn->model[i];
1171                 else
1172                         buf[i] = ' ';
1173         buf[i] = '\0';
1174         pr_debug("  Model: %s\n", buf);
1175
1176         for (i = 0; i < 4; i++)
1177                 if (wwn->revision[i] >= 0x20)
1178                         buf[i] = wwn->revision[i];
1179                 else
1180                         buf[i] = ' ';
1181         buf[i] = '\0';
1182         pr_debug("  Revision: %s\n", buf);
1183
1184         device_type = dev->transport->get_device_type(dev);
1185         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1186         pr_debug("                 ANSI SCSI revision: %02x\n",
1187                                 dev->transport->get_device_rev(dev));
1188 }
1189
1190 struct se_device *transport_add_device_to_core_hba(
1191         struct se_hba *hba,
1192         struct se_subsystem_api *transport,
1193         struct se_subsystem_dev *se_dev,
1194         u32 device_flags,
1195         void *transport_dev,
1196         struct se_dev_limits *dev_limits,
1197         const char *inquiry_prod,
1198         const char *inquiry_rev)
1199 {
1200         int force_pt;
1201         struct se_device  *dev;
1202
1203         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1204         if (!dev) {
1205                 pr_err("Unable to allocate memory for se_dev_t\n");
1206                 return NULL;
1207         }
1208
1209         transport_init_queue_obj(&dev->dev_queue_obj);
1210         dev->dev_flags          = device_flags;
1211         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1212         dev->dev_ptr            = transport_dev;
1213         dev->se_hba             = hba;
1214         dev->se_sub_dev         = se_dev;
1215         dev->transport          = transport;
1216         INIT_LIST_HEAD(&dev->dev_list);
1217         INIT_LIST_HEAD(&dev->dev_sep_list);
1218         INIT_LIST_HEAD(&dev->dev_tmr_list);
1219         INIT_LIST_HEAD(&dev->execute_list);
1220         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1221         INIT_LIST_HEAD(&dev->state_list);
1222         INIT_LIST_HEAD(&dev->qf_cmd_list);
1223         spin_lock_init(&dev->execute_task_lock);
1224         spin_lock_init(&dev->delayed_cmd_lock);
1225         spin_lock_init(&dev->dev_reservation_lock);
1226         spin_lock_init(&dev->dev_status_lock);
1227         spin_lock_init(&dev->se_port_lock);
1228         spin_lock_init(&dev->se_tmr_lock);
1229         spin_lock_init(&dev->qf_cmd_lock);
1230         atomic_set(&dev->dev_ordered_id, 0);
1231
1232         se_dev_set_default_attribs(dev, dev_limits);
1233
1234         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1235         dev->creation_time = get_jiffies_64();
1236         spin_lock_init(&dev->stats_lock);
1237
1238         spin_lock(&hba->device_lock);
1239         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1240         hba->dev_count++;
1241         spin_unlock(&hba->device_lock);
1242         /*
1243          * Setup the SAM Task Attribute emulation for struct se_device
1244          */
1245         core_setup_task_attr_emulation(dev);
1246         /*
1247          * Force PR and ALUA passthrough emulation with internal object use.
1248          */
1249         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1250         /*
1251          * Setup the Reservations infrastructure for struct se_device
1252          */
1253         core_setup_reservations(dev, force_pt);
1254         /*
1255          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1256          */
1257         if (core_setup_alua(dev, force_pt) < 0)
1258                 goto out;
1259
1260         /*
1261          * Startup the struct se_device processing thread
1262          */
1263         dev->process_thread = kthread_run(transport_processing_thread, dev,
1264                                           "LIO_%s", dev->transport->name);
1265         if (IS_ERR(dev->process_thread)) {
1266                 pr_err("Unable to create kthread: LIO_%s\n",
1267                         dev->transport->name);
1268                 goto out;
1269         }
1270         /*
1271          * Setup work_queue for QUEUE_FULL
1272          */
1273         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1274         /*
1275          * Preload the initial INQUIRY const values if we are doing
1276          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1277          * passthrough because this is being provided by the backend LLD.
1278          * This is required so that transport_get_inquiry() copies these
1279          * originals once back into DEV_T10_WWN(dev) for the virtual device
1280          * setup.
1281          */
1282         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1283                 if (!inquiry_prod || !inquiry_rev) {
1284                         pr_err("All non TCM/pSCSI plugins require"
1285                                 " INQUIRY consts\n");
1286                         goto out;
1287                 }
1288
1289                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1290                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1291                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1292         }
1293         scsi_dump_inquiry(dev);
1294
1295         return dev;
1296 out:
1297         kthread_stop(dev->process_thread);
1298
1299         spin_lock(&hba->device_lock);
1300         list_del(&dev->dev_list);
1301         hba->dev_count--;
1302         spin_unlock(&hba->device_lock);
1303
1304         se_release_vpd_for_dev(dev);
1305
1306         kfree(dev);
1307
1308         return NULL;
1309 }
1310 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1311
1312 /*      transport_generic_prepare_cdb():
1313  *
1314  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1315  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1316  *      The point of this is since we are mapping iSCSI LUNs to
1317  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1318  *      devices and HBAs for a loop.
1319  */
1320 static inline void transport_generic_prepare_cdb(
1321         unsigned char *cdb)
1322 {
1323         switch (cdb[0]) {
1324         case READ_10: /* SBC - RDProtect */
1325         case READ_12: /* SBC - RDProtect */
1326         case READ_16: /* SBC - RDProtect */
1327         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1328         case VERIFY: /* SBC - VRProtect */
1329         case VERIFY_16: /* SBC - VRProtect */
1330         case WRITE_VERIFY: /* SBC - VRProtect */
1331         case WRITE_VERIFY_12: /* SBC - VRProtect */
1332                 break;
1333         default:
1334                 cdb[1] &= 0x1f; /* clear logical unit number */
1335                 break;
1336         }
1337 }
1338
1339 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1340
1341 /*
1342  * Used by fabric modules containing a local struct se_cmd within their
1343  * fabric dependent per I/O descriptor.
1344  */
1345 void transport_init_se_cmd(
1346         struct se_cmd *cmd,
1347         struct target_core_fabric_ops *tfo,
1348         struct se_session *se_sess,
1349         u32 data_length,
1350         int data_direction,
1351         int task_attr,
1352         unsigned char *sense_buffer)
1353 {
1354         INIT_LIST_HEAD(&cmd->se_lun_node);
1355         INIT_LIST_HEAD(&cmd->se_delayed_node);
1356         INIT_LIST_HEAD(&cmd->se_qf_node);
1357         INIT_LIST_HEAD(&cmd->se_queue_node);
1358         INIT_LIST_HEAD(&cmd->se_cmd_list);
1359         INIT_LIST_HEAD(&cmd->execute_list);
1360         INIT_LIST_HEAD(&cmd->state_list);
1361         init_completion(&cmd->transport_lun_fe_stop_comp);
1362         init_completion(&cmd->transport_lun_stop_comp);
1363         init_completion(&cmd->t_transport_stop_comp);
1364         init_completion(&cmd->cmd_wait_comp);
1365         init_completion(&cmd->task_stop_comp);
1366         spin_lock_init(&cmd->t_state_lock);
1367         cmd->transport_state = CMD_T_DEV_ACTIVE;
1368
1369         cmd->se_tfo = tfo;
1370         cmd->se_sess = se_sess;
1371         cmd->data_length = data_length;
1372         cmd->data_direction = data_direction;
1373         cmd->sam_task_attr = task_attr;
1374         cmd->sense_buffer = sense_buffer;
1375
1376         cmd->state_active = false;
1377 }
1378 EXPORT_SYMBOL(transport_init_se_cmd);
1379
1380 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1381 {
1382         /*
1383          * Check if SAM Task Attribute emulation is enabled for this
1384          * struct se_device storage object
1385          */
1386         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1387                 return 0;
1388
1389         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1390                 pr_debug("SAM Task Attribute ACA"
1391                         " emulation is not supported\n");
1392                 return -EINVAL;
1393         }
1394         /*
1395          * Used to determine when ORDERED commands should go from
1396          * Dormant to Active status.
1397          */
1398         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1399         smp_mb__after_atomic_inc();
1400         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1401                         cmd->se_ordered_id, cmd->sam_task_attr,
1402                         cmd->se_dev->transport->name);
1403         return 0;
1404 }
1405
1406 /*      target_setup_cmd_from_cdb():
1407  *
1408  *      Called from fabric RX Thread.
1409  */
1410 int target_setup_cmd_from_cdb(
1411         struct se_cmd *cmd,
1412         unsigned char *cdb)
1413 {
1414         int ret;
1415
1416         transport_generic_prepare_cdb(cdb);
1417         /*
1418          * Ensure that the received CDB is less than the max (252 + 8) bytes
1419          * for VARIABLE_LENGTH_CMD
1420          */
1421         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1422                 pr_err("Received SCSI CDB with command_size: %d that"
1423                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1424                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1425                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1426                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1427                 return -EINVAL;
1428         }
1429         /*
1430          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1431          * allocate the additional extended CDB buffer now..  Otherwise
1432          * setup the pointer from __t_task_cdb to t_task_cdb.
1433          */
1434         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1435                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1436                                                 GFP_KERNEL);
1437                 if (!cmd->t_task_cdb) {
1438                         pr_err("Unable to allocate cmd->t_task_cdb"
1439                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1440                                 scsi_command_size(cdb),
1441                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1442                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1443                         cmd->scsi_sense_reason =
1444                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1445                         return -ENOMEM;
1446                 }
1447         } else
1448                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1449         /*
1450          * Copy the original CDB into cmd->
1451          */
1452         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1453         /*
1454          * Setup the received CDB based on SCSI defined opcodes and
1455          * perform unit attention, persistent reservations and ALUA
1456          * checks for virtual device backends.  The cmd->t_task_cdb
1457          * pointer is expected to be setup before we reach this point.
1458          */
1459         ret = transport_generic_cmd_sequencer(cmd, cdb);
1460         if (ret < 0)
1461                 return ret;
1462         /*
1463          * Check for SAM Task Attribute Emulation
1464          */
1465         if (transport_check_alloc_task_attr(cmd) < 0) {
1466                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1467                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1468                 return -EINVAL;
1469         }
1470         spin_lock(&cmd->se_lun->lun_sep_lock);
1471         if (cmd->se_lun->lun_sep)
1472                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1473         spin_unlock(&cmd->se_lun->lun_sep_lock);
1474         return 0;
1475 }
1476 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1477
1478 /*
1479  * Used by fabric module frontends to queue tasks directly.
1480  * Many only be used from process context only
1481  */
1482 int transport_handle_cdb_direct(
1483         struct se_cmd *cmd)
1484 {
1485         int ret;
1486
1487         if (!cmd->se_lun) {
1488                 dump_stack();
1489                 pr_err("cmd->se_lun is NULL\n");
1490                 return -EINVAL;
1491         }
1492         if (in_interrupt()) {
1493                 dump_stack();
1494                 pr_err("transport_generic_handle_cdb cannot be called"
1495                                 " from interrupt context\n");
1496                 return -EINVAL;
1497         }
1498         /*
1499          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1500          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1501          * in existing usage to ensure that outstanding descriptors are handled
1502          * correctly during shutdown via transport_wait_for_tasks()
1503          *
1504          * Also, we don't take cmd->t_state_lock here as we only expect
1505          * this to be called for initial descriptor submission.
1506          */
1507         cmd->t_state = TRANSPORT_NEW_CMD;
1508         cmd->transport_state |= CMD_T_ACTIVE;
1509
1510         /*
1511          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1512          * so follow TRANSPORT_NEW_CMD processing thread context usage
1513          * and call transport_generic_request_failure() if necessary..
1514          */
1515         ret = transport_generic_new_cmd(cmd);
1516         if (ret < 0)
1517                 transport_generic_request_failure(cmd);
1518
1519         return 0;
1520 }
1521 EXPORT_SYMBOL(transport_handle_cdb_direct);
1522
1523 /**
1524  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1525  *
1526  * @se_cmd: command descriptor to submit
1527  * @se_sess: associated se_sess for endpoint
1528  * @cdb: pointer to SCSI CDB
1529  * @sense: pointer to SCSI sense buffer
1530  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1531  * @data_length: fabric expected data transfer length
1532  * @task_addr: SAM task attribute
1533  * @data_dir: DMA data direction
1534  * @flags: flags for command submission from target_sc_flags_tables
1535  *
1536  * This may only be called from process context, and also currently
1537  * assumes internal allocation of fabric payload buffer by target-core.
1538  **/
1539 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1540                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1541                 u32 data_length, int task_attr, int data_dir, int flags)
1542 {
1543         struct se_portal_group *se_tpg;
1544         int rc;
1545
1546         se_tpg = se_sess->se_tpg;
1547         BUG_ON(!se_tpg);
1548         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1549         BUG_ON(in_interrupt());
1550         /*
1551          * Initialize se_cmd for target operation.  From this point
1552          * exceptions are handled by sending exception status via
1553          * target_core_fabric_ops->queue_status() callback
1554          */
1555         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1556                                 data_length, data_dir, task_attr, sense);
1557         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1558                 se_cmd->unknown_data_length = 1;
1559         /*
1560          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1561          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1562          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1563          * kref_put() to happen during fabric packet acknowledgement.
1564          */
1565         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1566         /*
1567          * Signal bidirectional data payloads to target-core
1568          */
1569         if (flags & TARGET_SCF_BIDI_OP)
1570                 se_cmd->se_cmd_flags |= SCF_BIDI;
1571         /*
1572          * Locate se_lun pointer and attach it to struct se_cmd
1573          */
1574         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1575                 transport_send_check_condition_and_sense(se_cmd,
1576                                 se_cmd->scsi_sense_reason, 0);
1577                 target_put_sess_cmd(se_sess, se_cmd);
1578                 return;
1579         }
1580         /*
1581          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1582          * allocate the necessary tasks to complete the received CDB+data
1583          */
1584         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1585         if (rc != 0) {
1586                 transport_generic_request_failure(se_cmd);
1587                 return;
1588         }
1589
1590         /*
1591          * Check if we need to delay processing because of ALUA
1592          * Active/NonOptimized primary access state..
1593          */
1594         core_alua_check_nonop_delay(se_cmd);
1595
1596         /*
1597          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1598          * for immediate execution of READs, otherwise wait for
1599          * transport_generic_handle_data() to be called for WRITEs
1600          * when fabric has filled the incoming buffer.
1601          */
1602         transport_handle_cdb_direct(se_cmd);
1603         return;
1604 }
1605 EXPORT_SYMBOL(target_submit_cmd);
1606
1607 static void target_complete_tmr_failure(struct work_struct *work)
1608 {
1609         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1610
1611         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1612         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1613         transport_generic_free_cmd(se_cmd, 0);
1614 }
1615
1616 /**
1617  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1618  *                     for TMR CDBs
1619  *
1620  * @se_cmd: command descriptor to submit
1621  * @se_sess: associated se_sess for endpoint
1622  * @sense: pointer to SCSI sense buffer
1623  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1624  * @fabric_context: fabric context for TMR req
1625  * @tm_type: Type of TM request
1626  * @gfp: gfp type for caller
1627  * @tag: referenced task tag for TMR_ABORT_TASK
1628  * @flags: submit cmd flags
1629  *
1630  * Callable from all contexts.
1631  **/
1632
1633 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1634                 unsigned char *sense, u32 unpacked_lun,
1635                 void *fabric_tmr_ptr, unsigned char tm_type,
1636                 gfp_t gfp, unsigned int tag, int flags)
1637 {
1638         struct se_portal_group *se_tpg;
1639         int ret;
1640
1641         se_tpg = se_sess->se_tpg;
1642         BUG_ON(!se_tpg);
1643
1644         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1645                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1646         /*
1647          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1648          * allocation failure.
1649          */
1650         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1651         if (ret < 0)
1652                 return -ENOMEM;
1653
1654         if (tm_type == TMR_ABORT_TASK)
1655                 se_cmd->se_tmr_req->ref_task_tag = tag;
1656
1657         /* See target_submit_cmd for commentary */
1658         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1659
1660         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1661         if (ret) {
1662                 /*
1663                  * For callback during failure handling, push this work off
1664                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1665                  */
1666                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1667                 schedule_work(&se_cmd->work);
1668                 return 0;
1669         }
1670         transport_generic_handle_tmr(se_cmd);
1671         return 0;
1672 }
1673 EXPORT_SYMBOL(target_submit_tmr);
1674
1675 /*
1676  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1677  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1678  * complete setup in TCM process context w/ TFO->new_cmd_map().
1679  */
1680 int transport_generic_handle_cdb_map(
1681         struct se_cmd *cmd)
1682 {
1683         if (!cmd->se_lun) {
1684                 dump_stack();
1685                 pr_err("cmd->se_lun is NULL\n");
1686                 return -EINVAL;
1687         }
1688
1689         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1690         return 0;
1691 }
1692 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1693
1694 /*      transport_generic_handle_data():
1695  *
1696  *
1697  */
1698 int transport_generic_handle_data(
1699         struct se_cmd *cmd)
1700 {
1701         /*
1702          * For the software fabric case, then we assume the nexus is being
1703          * failed/shutdown when signals are pending from the kthread context
1704          * caller, so we return a failure.  For the HW target mode case running
1705          * in interrupt code, the signal_pending() check is skipped.
1706          */
1707         if (!in_interrupt() && signal_pending(current))
1708                 return -EPERM;
1709         /*
1710          * If the received CDB has aleady been ABORTED by the generic
1711          * target engine, we now call transport_check_aborted_status()
1712          * to queue any delated TASK_ABORTED status for the received CDB to the
1713          * fabric module as we are expecting no further incoming DATA OUT
1714          * sequences at this point.
1715          */
1716         if (transport_check_aborted_status(cmd, 1) != 0)
1717                 return 0;
1718
1719         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1720         return 0;
1721 }
1722 EXPORT_SYMBOL(transport_generic_handle_data);
1723
1724 /*      transport_generic_handle_tmr():
1725  *
1726  *
1727  */
1728 int transport_generic_handle_tmr(
1729         struct se_cmd *cmd)
1730 {
1731         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1732         return 0;
1733 }
1734 EXPORT_SYMBOL(transport_generic_handle_tmr);
1735
1736 /*
1737  * If the cmd is active, request it to be stopped and sleep until it
1738  * has completed.
1739  */
1740 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1741 {
1742         bool was_active = false;
1743
1744         if (cmd->transport_state & CMD_T_BUSY) {
1745                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1746                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1747
1748                 pr_debug("cmd %p waiting to complete\n", cmd);
1749                 wait_for_completion(&cmd->task_stop_comp);
1750                 pr_debug("cmd %p stopped successfully\n", cmd);
1751
1752                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1753                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1754                 cmd->transport_state &= ~CMD_T_BUSY;
1755                 was_active = true;
1756         }
1757
1758         return was_active;
1759 }
1760
1761 /*
1762  * Handle SAM-esque emulation for generic transport request failures.
1763  */
1764 void transport_generic_request_failure(struct se_cmd *cmd)
1765 {
1766         int ret = 0;
1767
1768         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1769                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1770                 cmd->t_task_cdb[0]);
1771         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1772                 cmd->se_tfo->get_cmd_state(cmd),
1773                 cmd->t_state, cmd->scsi_sense_reason);
1774         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1775                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1776                 (cmd->transport_state & CMD_T_STOP) != 0,
1777                 (cmd->transport_state & CMD_T_SENT) != 0);
1778
1779         /*
1780          * For SAM Task Attribute emulation for failed struct se_cmd
1781          */
1782         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1783                 transport_complete_task_attr(cmd);
1784
1785         switch (cmd->scsi_sense_reason) {
1786         case TCM_NON_EXISTENT_LUN:
1787         case TCM_UNSUPPORTED_SCSI_OPCODE:
1788         case TCM_INVALID_CDB_FIELD:
1789         case TCM_INVALID_PARAMETER_LIST:
1790         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1791         case TCM_UNKNOWN_MODE_PAGE:
1792         case TCM_WRITE_PROTECTED:
1793         case TCM_CHECK_CONDITION_ABORT_CMD:
1794         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1795         case TCM_CHECK_CONDITION_NOT_READY:
1796                 break;
1797         case TCM_RESERVATION_CONFLICT:
1798                 /*
1799                  * No SENSE Data payload for this case, set SCSI Status
1800                  * and queue the response to $FABRIC_MOD.
1801                  *
1802                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1803                  */
1804                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1805                 /*
1806                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1807                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1808                  * CONFLICT STATUS.
1809                  *
1810                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1811                  */
1812                 if (cmd->se_sess &&
1813                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1814                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1815                                 cmd->orig_fe_lun, 0x2C,
1816                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1817
1818                 ret = cmd->se_tfo->queue_status(cmd);
1819                 if (ret == -EAGAIN || ret == -ENOMEM)
1820                         goto queue_full;
1821                 goto check_stop;
1822         default:
1823                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1824                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1825                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1826                 break;
1827         }
1828         /*
1829          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1830          * make the call to transport_send_check_condition_and_sense()
1831          * directly.  Otherwise expect the fabric to make the call to
1832          * transport_send_check_condition_and_sense() after handling
1833          * possible unsoliticied write data payloads.
1834          */
1835         ret = transport_send_check_condition_and_sense(cmd,
1836                         cmd->scsi_sense_reason, 0);
1837         if (ret == -EAGAIN || ret == -ENOMEM)
1838                 goto queue_full;
1839
1840 check_stop:
1841         transport_lun_remove_cmd(cmd);
1842         if (!transport_cmd_check_stop_to_fabric(cmd))
1843                 ;
1844         return;
1845
1846 queue_full:
1847         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1848         transport_handle_queue_full(cmd, cmd->se_dev);
1849 }
1850 EXPORT_SYMBOL(transport_generic_request_failure);
1851
1852 static inline u32 transport_lba_21(unsigned char *cdb)
1853 {
1854         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1855 }
1856
1857 static inline u32 transport_lba_32(unsigned char *cdb)
1858 {
1859         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1860 }
1861
1862 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1863 {
1864         unsigned int __v1, __v2;
1865
1866         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1867         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1868
1869         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1870 }
1871
1872 /*
1873  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1874  */
1875 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1876 {
1877         unsigned int __v1, __v2;
1878
1879         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1880         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1881
1882         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1883 }
1884
1885 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1886 {
1887         unsigned long flags;
1888
1889         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1890         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1891         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1892 }
1893
1894 /*
1895  * Called from Fabric Module context from transport_execute_tasks()
1896  *
1897  * The return of this function determins if the tasks from struct se_cmd
1898  * get added to the execution queue in transport_execute_tasks(),
1899  * or are added to the delayed or ordered lists here.
1900  */
1901 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1902 {
1903         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1904                 return 1;
1905         /*
1906          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1907          * to allow the passed struct se_cmd list of tasks to the front of the list.
1908          */
1909          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1910                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1911                         " 0x%02x, se_ordered_id: %u\n",
1912                         cmd->t_task_cdb[0],
1913                         cmd->se_ordered_id);
1914                 return 1;
1915         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1916                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1917                 smp_mb__after_atomic_inc();
1918
1919                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1920                                 " list, se_ordered_id: %u\n",
1921                                 cmd->t_task_cdb[0],
1922                                 cmd->se_ordered_id);
1923                 /*
1924                  * Add ORDERED command to tail of execution queue if
1925                  * no other older commands exist that need to be
1926                  * completed first.
1927                  */
1928                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1929                         return 1;
1930         } else {
1931                 /*
1932                  * For SIMPLE and UNTAGGED Task Attribute commands
1933                  */
1934                 atomic_inc(&cmd->se_dev->simple_cmds);
1935                 smp_mb__after_atomic_inc();
1936         }
1937         /*
1938          * Otherwise if one or more outstanding ORDERED task attribute exist,
1939          * add the dormant task(s) built for the passed struct se_cmd to the
1940          * execution queue and become in Active state for this struct se_device.
1941          */
1942         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1943                 /*
1944                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1945                  * will be drained upon completion of HEAD_OF_QUEUE task.
1946                  */
1947                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1948                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1949                 list_add_tail(&cmd->se_delayed_node,
1950                                 &cmd->se_dev->delayed_cmd_list);
1951                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1952
1953                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1954                         " delayed CMD list, se_ordered_id: %u\n",
1955                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1956                         cmd->se_ordered_id);
1957                 /*
1958                  * Return zero to let transport_execute_tasks() know
1959                  * not to add the delayed tasks to the execution list.
1960                  */
1961                 return 0;
1962         }
1963         /*
1964          * Otherwise, no ORDERED task attributes exist..
1965          */
1966         return 1;
1967 }
1968
1969 /*
1970  * Called from fabric module context in transport_generic_new_cmd() and
1971  * transport_generic_process_write()
1972  */
1973 static void transport_execute_tasks(struct se_cmd *cmd)
1974 {
1975         int add_tasks;
1976         struct se_device *se_dev = cmd->se_dev;
1977         /*
1978          * Call transport_cmd_check_stop() to see if a fabric exception
1979          * has occurred that prevents execution.
1980          */
1981         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
1982                 /*
1983                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1984                  * attribute for the tasks of the received struct se_cmd CDB
1985                  */
1986                 add_tasks = transport_execute_task_attr(cmd);
1987                 if (add_tasks) {
1988                         __transport_execute_tasks(se_dev, cmd);
1989                         return;
1990                 }
1991         }
1992         __transport_execute_tasks(se_dev, NULL);
1993 }
1994
1995 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
1996 {
1997         int error;
1998         struct se_cmd *cmd = NULL;
1999         unsigned long flags;
2000
2001 check_depth:
2002         spin_lock_irq(&dev->execute_task_lock);
2003         if (new_cmd != NULL)
2004                 __target_add_to_execute_list(new_cmd);
2005
2006         if (list_empty(&dev->execute_list)) {
2007                 spin_unlock_irq(&dev->execute_task_lock);
2008                 return 0;
2009         }
2010         cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2011         __target_remove_from_execute_list(cmd);
2012         spin_unlock_irq(&dev->execute_task_lock);
2013
2014         spin_lock_irqsave(&cmd->t_state_lock, flags);
2015         cmd->transport_state |= CMD_T_BUSY;
2016         cmd->transport_state |= CMD_T_SENT;
2017
2018         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2019
2020         if (cmd->execute_cmd)
2021                 error = cmd->execute_cmd(cmd);
2022         else {
2023                 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2024                                 cmd->t_data_nents, cmd->data_direction);
2025         }
2026
2027         if (error != 0) {
2028                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2029                 cmd->transport_state &= ~CMD_T_BUSY;
2030                 cmd->transport_state &= ~CMD_T_SENT;
2031                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2032
2033                 transport_generic_request_failure(cmd);
2034         }
2035
2036         new_cmd = NULL;
2037         goto check_depth;
2038
2039         return 0;
2040 }
2041
2042 static inline u32 transport_get_sectors_6(
2043         unsigned char *cdb,
2044         struct se_cmd *cmd,
2045         int *ret)
2046 {
2047         struct se_device *dev = cmd->se_dev;
2048
2049         /*
2050          * Assume TYPE_DISK for non struct se_device objects.
2051          * Use 8-bit sector value.
2052          */
2053         if (!dev)
2054                 goto type_disk;
2055
2056         /*
2057          * Use 24-bit allocation length for TYPE_TAPE.
2058          */
2059         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2060                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2061
2062         /*
2063          * Everything else assume TYPE_DISK Sector CDB location.
2064          * Use 8-bit sector value.  SBC-3 says:
2065          *
2066          *   A TRANSFER LENGTH field set to zero specifies that 256
2067          *   logical blocks shall be written.  Any other value
2068          *   specifies the number of logical blocks that shall be
2069          *   written.
2070          */
2071 type_disk:
2072         return cdb[4] ? : 256;
2073 }
2074
2075 static inline u32 transport_get_sectors_10(
2076         unsigned char *cdb,
2077         struct se_cmd *cmd,
2078         int *ret)
2079 {
2080         struct se_device *dev = cmd->se_dev;
2081
2082         /*
2083          * Assume TYPE_DISK for non struct se_device objects.
2084          * Use 16-bit sector value.
2085          */
2086         if (!dev)
2087                 goto type_disk;
2088
2089         /*
2090          * XXX_10 is not defined in SSC, throw an exception
2091          */
2092         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2093                 *ret = -EINVAL;
2094                 return 0;
2095         }
2096
2097         /*
2098          * Everything else assume TYPE_DISK Sector CDB location.
2099          * Use 16-bit sector value.
2100          */
2101 type_disk:
2102         return (u32)(cdb[7] << 8) + cdb[8];
2103 }
2104
2105 static inline u32 transport_get_sectors_12(
2106         unsigned char *cdb,
2107         struct se_cmd *cmd,
2108         int *ret)
2109 {
2110         struct se_device *dev = cmd->se_dev;
2111
2112         /*
2113          * Assume TYPE_DISK for non struct se_device objects.
2114          * Use 32-bit sector value.
2115          */
2116         if (!dev)
2117                 goto type_disk;
2118
2119         /*
2120          * XXX_12 is not defined in SSC, throw an exception
2121          */
2122         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2123                 *ret = -EINVAL;
2124                 return 0;
2125         }
2126
2127         /*
2128          * Everything else assume TYPE_DISK Sector CDB location.
2129          * Use 32-bit sector value.
2130          */
2131 type_disk:
2132         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2133 }
2134
2135 static inline u32 transport_get_sectors_16(
2136         unsigned char *cdb,
2137         struct se_cmd *cmd,
2138         int *ret)
2139 {
2140         struct se_device *dev = cmd->se_dev;
2141
2142         /*
2143          * Assume TYPE_DISK for non struct se_device objects.
2144          * Use 32-bit sector value.
2145          */
2146         if (!dev)
2147                 goto type_disk;
2148
2149         /*
2150          * Use 24-bit allocation length for TYPE_TAPE.
2151          */
2152         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2153                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2154
2155 type_disk:
2156         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2157                     (cdb[12] << 8) + cdb[13];
2158 }
2159
2160 /*
2161  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2162  */
2163 static inline u32 transport_get_sectors_32(
2164         unsigned char *cdb,
2165         struct se_cmd *cmd,
2166         int *ret)
2167 {
2168         /*
2169          * Assume TYPE_DISK for non struct se_device objects.
2170          * Use 32-bit sector value.
2171          */
2172         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2173                     (cdb[30] << 8) + cdb[31];
2174
2175 }
2176
2177 static inline u32 transport_get_size(
2178         u32 sectors,
2179         unsigned char *cdb,
2180         struct se_cmd *cmd)
2181 {
2182         struct se_device *dev = cmd->se_dev;
2183
2184         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2185                 if (cdb[1] & 1) { /* sectors */
2186                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2187                 } else /* bytes */
2188                         return sectors;
2189         }
2190
2191         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2192                 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2193                 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2194                 dev->transport->name);
2195
2196         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2197 }
2198
2199 static void transport_xor_callback(struct se_cmd *cmd)
2200 {
2201         unsigned char *buf, *addr;
2202         struct scatterlist *sg;
2203         unsigned int offset;
2204         int i;
2205         int count;
2206         /*
2207          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2208          *
2209          * 1) read the specified logical block(s);
2210          * 2) transfer logical blocks from the data-out buffer;
2211          * 3) XOR the logical blocks transferred from the data-out buffer with
2212          *    the logical blocks read, storing the resulting XOR data in a buffer;
2213          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2214          *    blocks transferred from the data-out buffer; and
2215          * 5) transfer the resulting XOR data to the data-in buffer.
2216          */
2217         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2218         if (!buf) {
2219                 pr_err("Unable to allocate xor_callback buf\n");
2220                 return;
2221         }
2222         /*
2223          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2224          * into the locally allocated *buf
2225          */
2226         sg_copy_to_buffer(cmd->t_data_sg,
2227                           cmd->t_data_nents,
2228                           buf,
2229                           cmd->data_length);
2230
2231         /*
2232          * Now perform the XOR against the BIDI read memory located at
2233          * cmd->t_mem_bidi_list
2234          */
2235
2236         offset = 0;
2237         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2238                 addr = kmap_atomic(sg_page(sg));
2239                 if (!addr)
2240                         goto out;
2241
2242                 for (i = 0; i < sg->length; i++)
2243                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2244
2245                 offset += sg->length;
2246                 kunmap_atomic(addr);
2247         }
2248
2249 out:
2250         kfree(buf);
2251 }
2252
2253 /*
2254  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2255  */
2256 static int transport_get_sense_data(struct se_cmd *cmd)
2257 {
2258         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2259         struct se_device *dev = cmd->se_dev;
2260         unsigned long flags;
2261         u32 offset = 0;
2262
2263         WARN_ON(!cmd->se_lun);
2264
2265         if (!dev)
2266                 return 0;
2267
2268         spin_lock_irqsave(&cmd->t_state_lock, flags);
2269         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2270                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2271                 return 0;
2272         }
2273
2274         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2275                 goto out;
2276
2277         if (!dev->transport->get_sense_buffer) {
2278                 pr_err("dev->transport->get_sense_buffer is NULL\n");
2279                 goto out;
2280         }
2281
2282         sense_buffer = dev->transport->get_sense_buffer(cmd);
2283         if (!sense_buffer) {
2284                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2285                         " sense buffer for task with sense\n",
2286                         cmd->se_tfo->get_task_tag(cmd), cmd);
2287                 goto out;
2288         }
2289
2290         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2291
2292         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2293
2294         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2295
2296         /* Automatically padded */
2297         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2298
2299         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2300                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2301         return 0;
2302
2303 out:
2304         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2305         return -1;
2306 }
2307
2308 static inline long long transport_dev_end_lba(struct se_device *dev)
2309 {
2310         return dev->transport->get_blocks(dev) + 1;
2311 }
2312
2313 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2314 {
2315         struct se_device *dev = cmd->se_dev;
2316         u32 sectors;
2317
2318         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2319                 return 0;
2320
2321         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2322
2323         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2324                 pr_err("LBA: %llu Sectors: %u exceeds"
2325                         " transport_dev_end_lba(): %llu\n",
2326                         cmd->t_task_lba, sectors,
2327                         transport_dev_end_lba(dev));
2328                 return -EINVAL;
2329         }
2330
2331         return 0;
2332 }
2333
2334 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2335 {
2336         /*
2337          * Determine if the received WRITE_SAME is used to for direct
2338          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2339          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2340          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2341          */
2342         int passthrough = (dev->transport->transport_type ==
2343                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2344
2345         if (!passthrough) {
2346                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2347                         pr_err("WRITE_SAME PBDATA and LBDATA"
2348                                 " bits not supported for Block Discard"
2349                                 " Emulation\n");
2350                         return -ENOSYS;
2351                 }
2352                 /*
2353                  * Currently for the emulated case we only accept
2354                  * tpws with the UNMAP=1 bit set.
2355                  */
2356                 if (!(flags[0] & 0x08)) {
2357                         pr_err("WRITE_SAME w/o UNMAP bit not"
2358                                 " supported for Block Discard Emulation\n");
2359                         return -ENOSYS;
2360                 }
2361         }
2362
2363         return 0;
2364 }
2365
2366 /*      transport_generic_cmd_sequencer():
2367  *
2368  *      Generic Command Sequencer that should work for most DAS transport
2369  *      drivers.
2370  *
2371  *      Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2372  *      RX Thread.
2373  *
2374  *      FIXME: Need to support other SCSI OPCODES where as well.
2375  */
2376 static int transport_generic_cmd_sequencer(
2377         struct se_cmd *cmd,
2378         unsigned char *cdb)
2379 {
2380         struct se_device *dev = cmd->se_dev;
2381         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2382         int ret = 0, sector_ret = 0, passthrough;
2383         u32 sectors = 0, size = 0, pr_reg_type = 0;
2384         u16 service_action;
2385         u8 alua_ascq = 0;
2386         /*
2387          * Check for an existing UNIT ATTENTION condition
2388          */
2389         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2390                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2391                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2392                 return -EINVAL;
2393         }
2394         /*
2395          * Check status of Asymmetric Logical Unit Assignment port
2396          */
2397         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2398         if (ret != 0) {
2399                 /*
2400                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2401                  * The ALUA additional sense code qualifier (ASCQ) is determined
2402                  * by the ALUA primary or secondary access state..
2403                  */
2404                 if (ret > 0) {
2405                         pr_debug("[%s]: ALUA TG Port not available,"
2406                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2407                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2408
2409                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2410                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2411                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2412                         return -EINVAL;
2413                 }
2414                 goto out_invalid_cdb_field;
2415         }
2416         /*
2417          * Check status for SPC-3 Persistent Reservations
2418          */
2419         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2420                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2421                                         cmd, cdb, pr_reg_type) != 0) {
2422                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2423                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2424                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2425                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2426                         return -EBUSY;
2427                 }
2428                 /*
2429                  * This means the CDB is allowed for the SCSI Initiator port
2430                  * when said port is *NOT* holding the legacy SPC-2 or
2431                  * SPC-3 Persistent Reservation.
2432                  */
2433         }
2434
2435         /*
2436          * If we operate in passthrough mode we skip most CDB emulation and
2437          * instead hand the commands down to the physical SCSI device.
2438          */
2439         passthrough =
2440                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2441
2442         switch (cdb[0]) {
2443         case READ_6:
2444                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2445                 if (sector_ret)
2446                         goto out_unsupported_cdb;
2447                 size = transport_get_size(sectors, cdb, cmd);
2448                 cmd->t_task_lba = transport_lba_21(cdb);
2449                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2450                 break;
2451         case READ_10:
2452                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2453                 if (sector_ret)
2454                         goto out_unsupported_cdb;
2455                 size = transport_get_size(sectors, cdb, cmd);
2456                 cmd->t_task_lba = transport_lba_32(cdb);
2457                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2458                 break;
2459         case READ_12:
2460                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2461                 if (sector_ret)
2462                         goto out_unsupported_cdb;
2463                 size = transport_get_size(sectors, cdb, cmd);
2464                 cmd->t_task_lba = transport_lba_32(cdb);
2465                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2466                 break;
2467         case READ_16:
2468                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2469                 if (sector_ret)
2470                         goto out_unsupported_cdb;
2471                 size = transport_get_size(sectors, cdb, cmd);
2472                 cmd->t_task_lba = transport_lba_64(cdb);
2473                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2474                 break;
2475         case WRITE_6:
2476                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2477                 if (sector_ret)
2478                         goto out_unsupported_cdb;
2479                 size = transport_get_size(sectors, cdb, cmd);
2480                 cmd->t_task_lba = transport_lba_21(cdb);
2481                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2482                 break;
2483         case WRITE_10:
2484         case WRITE_VERIFY:
2485                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2486                 if (sector_ret)
2487                         goto out_unsupported_cdb;
2488                 size = transport_get_size(sectors, cdb, cmd);
2489                 cmd->t_task_lba = transport_lba_32(cdb);
2490                 if (cdb[1] & 0x8)
2491                         cmd->se_cmd_flags |= SCF_FUA;
2492                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2493                 break;
2494         case WRITE_12:
2495                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2496                 if (sector_ret)
2497                         goto out_unsupported_cdb;
2498                 size = transport_get_size(sectors, cdb, cmd);
2499                 cmd->t_task_lba = transport_lba_32(cdb);
2500                 if (cdb[1] & 0x8)
2501                         cmd->se_cmd_flags |= SCF_FUA;
2502                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2503                 break;
2504         case WRITE_16:
2505                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2506                 if (sector_ret)
2507                         goto out_unsupported_cdb;
2508                 size = transport_get_size(sectors, cdb, cmd);
2509                 cmd->t_task_lba = transport_lba_64(cdb);
2510                 if (cdb[1] & 0x8)
2511                         cmd->se_cmd_flags |= SCF_FUA;
2512                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2513                 break;
2514         case XDWRITEREAD_10:
2515                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2516                     !(cmd->se_cmd_flags & SCF_BIDI))
2517                         goto out_invalid_cdb_field;
2518                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2519                 if (sector_ret)
2520                         goto out_unsupported_cdb;
2521                 size = transport_get_size(sectors, cdb, cmd);
2522                 cmd->t_task_lba = transport_lba_32(cdb);
2523                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2524
2525                 /*
2526                  * Do now allow BIDI commands for passthrough mode.
2527                  */
2528                 if (passthrough)
2529                         goto out_unsupported_cdb;
2530
2531                 /*
2532                  * Setup BIDI XOR callback to be run after I/O completion.
2533                  */
2534                 cmd->transport_complete_callback = &transport_xor_callback;
2535                 if (cdb[1] & 0x8)
2536                         cmd->se_cmd_flags |= SCF_FUA;
2537                 break;
2538         case VARIABLE_LENGTH_CMD:
2539                 service_action = get_unaligned_be16(&cdb[8]);
2540                 switch (service_action) {
2541                 case XDWRITEREAD_32:
2542                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2543                         if (sector_ret)
2544                                 goto out_unsupported_cdb;
2545                         size = transport_get_size(sectors, cdb, cmd);
2546                         /*
2547                          * Use WRITE_32 and READ_32 opcodes for the emulated
2548                          * XDWRITE_READ_32 logic.
2549                          */
2550                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2551                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2552
2553                         /*
2554                          * Do now allow BIDI commands for passthrough mode.
2555                          */
2556                         if (passthrough)
2557                                 goto out_unsupported_cdb;
2558
2559                         /*
2560                          * Setup BIDI XOR callback to be run during after I/O
2561                          * completion.
2562                          */
2563                         cmd->transport_complete_callback = &transport_xor_callback;
2564                         if (cdb[1] & 0x8)
2565                                 cmd->se_cmd_flags |= SCF_FUA;
2566                         break;
2567                 case WRITE_SAME_32:
2568                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2569                         if (sector_ret)
2570                                 goto out_unsupported_cdb;
2571
2572                         if (sectors)
2573                                 size = transport_get_size(1, cdb, cmd);
2574                         else {
2575                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2576                                        " supported\n");
2577                                 goto out_invalid_cdb_field;
2578                         }
2579
2580                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2581                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2582
2583                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2584                                 goto out_unsupported_cdb;
2585                         if (!passthrough)
2586                                 cmd->execute_cmd = target_emulate_write_same;
2587                         break;
2588                 default:
2589                         pr_err("VARIABLE_LENGTH_CMD service action"
2590                                 " 0x%04x not supported\n", service_action);
2591                         goto out_unsupported_cdb;
2592                 }
2593                 break;
2594         case MAINTENANCE_IN:
2595                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2596                         /* MAINTENANCE_IN from SCC-2 */
2597                         /*
2598                          * Check for emulated MI_REPORT_TARGET_PGS.
2599                          */
2600                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2601                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2602                                 cmd->execute_cmd =
2603                                         target_emulate_report_target_port_groups;
2604                         }
2605                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2606                                (cdb[8] << 8) | cdb[9];
2607                 } else {
2608                         /* GPCMD_SEND_KEY from multi media commands */
2609                         size = (cdb[8] << 8) + cdb[9];
2610                 }
2611                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2612                 break;
2613         case MODE_SELECT:
2614                 size = cdb[4];
2615                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2616                 break;
2617         case MODE_SELECT_10:
2618                 size = (cdb[7] << 8) + cdb[8];
2619                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2620                 break;
2621         case MODE_SENSE:
2622                 size = cdb[4];
2623                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2624                 if (!passthrough)
2625                         cmd->execute_cmd = target_emulate_modesense;
2626                 break;
2627         case MODE_SENSE_10:
2628                 size = (cdb[7] << 8) + cdb[8];
2629                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2630                 if (!passthrough)
2631                         cmd->execute_cmd = target_emulate_modesense;
2632                 break;
2633         case GPCMD_READ_BUFFER_CAPACITY:
2634         case GPCMD_SEND_OPC:
2635         case LOG_SELECT:
2636         case LOG_SENSE:
2637                 size = (cdb[7] << 8) + cdb[8];
2638                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2639                 break;
2640         case READ_BLOCK_LIMITS:
2641                 size = READ_BLOCK_LEN;
2642                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2643                 break;
2644         case GPCMD_GET_CONFIGURATION:
2645         case GPCMD_READ_FORMAT_CAPACITIES:
2646         case GPCMD_READ_DISC_INFO:
2647         case GPCMD_READ_TRACK_RZONE_INFO:
2648                 size = (cdb[7] << 8) + cdb[8];
2649                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2650                 break;
2651         case PERSISTENT_RESERVE_IN:
2652                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2653                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
2654                 size = (cdb[7] << 8) + cdb[8];
2655                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2656                 break;
2657         case PERSISTENT_RESERVE_OUT:
2658                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2659                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
2660                 size = (cdb[7] << 8) + cdb[8];
2661                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2662                 break;
2663         case GPCMD_MECHANISM_STATUS:
2664         case GPCMD_READ_DVD_STRUCTURE:
2665                 size = (cdb[8] << 8) + cdb[9];
2666                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2667                 break;
2668         case READ_POSITION:
2669                 size = READ_POSITION_LEN;
2670                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2671                 break;
2672         case MAINTENANCE_OUT:
2673                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2674                         /* MAINTENANCE_OUT from SCC-2
2675                          *
2676                          * Check for emulated MO_SET_TARGET_PGS.
2677                          */
2678                         if (cdb[1] == MO_SET_TARGET_PGS &&
2679                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2680                                 cmd->execute_cmd =
2681                                         target_emulate_set_target_port_groups;
2682                         }
2683
2684                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2685                                (cdb[8] << 8) | cdb[9];
2686                 } else  {
2687                         /* GPCMD_REPORT_KEY from multi media commands */
2688                         size = (cdb[8] << 8) + cdb[9];
2689                 }
2690                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2691                 break;
2692         case INQUIRY:
2693                 size = (cdb[3] << 8) + cdb[4];
2694                 /*
2695                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2696                  * See spc4r17 section 5.3
2697                  */
2698                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2699                         cmd->sam_task_attr = MSG_HEAD_TAG;
2700                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2701                 if (!passthrough)
2702                         cmd->execute_cmd = target_emulate_inquiry;
2703                 break;
2704         case READ_BUFFER:
2705                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2706                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2707                 break;
2708         case READ_CAPACITY:
2709                 size = READ_CAP_LEN;
2710                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2711                 if (!passthrough)
2712                         cmd->execute_cmd = target_emulate_readcapacity;
2713                 break;
2714         case READ_MEDIA_SERIAL_NUMBER:
2715         case SECURITY_PROTOCOL_IN:
2716         case SECURITY_PROTOCOL_OUT:
2717                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2718                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2719                 break;
2720         case SERVICE_ACTION_IN:
2721                 switch (cmd->t_task_cdb[1] & 0x1f) {
2722                 case SAI_READ_CAPACITY_16:
2723                         if (!passthrough)
2724                                 cmd->execute_cmd =
2725                                         target_emulate_readcapacity_16;
2726                         break;
2727                 default:
2728                         if (passthrough)
2729                                 break;
2730
2731                         pr_err("Unsupported SA: 0x%02x\n",
2732                                 cmd->t_task_cdb[1] & 0x1f);
2733                         goto out_invalid_cdb_field;
2734                 }
2735                 /*FALLTHROUGH*/
2736         case ACCESS_CONTROL_IN:
2737         case ACCESS_CONTROL_OUT:
2738         case EXTENDED_COPY:
2739         case READ_ATTRIBUTE:
2740         case RECEIVE_COPY_RESULTS:
2741         case WRITE_ATTRIBUTE:
2742                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2743                        (cdb[12] << 8) | cdb[13];
2744                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2745                 break;
2746         case RECEIVE_DIAGNOSTIC:
2747         case SEND_DIAGNOSTIC:
2748                 size = (cdb[3] << 8) | cdb[4];
2749                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2750                 break;
2751 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2752 #if 0
2753         case GPCMD_READ_CD:
2754                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2755                 size = (2336 * sectors);
2756                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2757                 break;
2758 #endif
2759         case READ_TOC:
2760                 size = cdb[8];
2761                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2762                 break;
2763         case REQUEST_SENSE:
2764                 size = cdb[4];
2765                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2766                 if (!passthrough)
2767                         cmd->execute_cmd = target_emulate_request_sense;
2768                 break;
2769         case READ_ELEMENT_STATUS:
2770                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2771                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2772                 break;
2773         case WRITE_BUFFER:
2774                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2775                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2776                 break;
2777         case RESERVE:
2778         case RESERVE_10:
2779                 /*
2780                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2781                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2782                  */
2783                 if (cdb[0] == RESERVE_10)
2784                         size = (cdb[7] << 8) | cdb[8];
2785                 else
2786                         size = cmd->data_length;
2787
2788                 /*
2789                  * Setup the legacy emulated handler for SPC-2 and
2790                  * >= SPC-3 compatible reservation handling (CRH=1)
2791                  * Otherwise, we assume the underlying SCSI logic is
2792                  * is running in SPC_PASSTHROUGH, and wants reservations
2793                  * emulation disabled.
2794                  */
2795                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2796                         cmd->execute_cmd = target_scsi2_reservation_reserve;
2797                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2798                 break;
2799         case RELEASE:
2800         case RELEASE_10:
2801                 /*
2802                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2803                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2804                 */
2805                 if (cdb[0] == RELEASE_10)
2806                         size = (cdb[7] << 8) | cdb[8];
2807                 else
2808                         size = cmd->data_length;
2809
2810                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2811                         cmd->execute_cmd = target_scsi2_reservation_release;
2812                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2813                 break;
2814         case SYNCHRONIZE_CACHE:
2815         case SYNCHRONIZE_CACHE_16:
2816                 /*
2817                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2818                  */
2819                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2820                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2821                         cmd->t_task_lba = transport_lba_32(cdb);
2822                 } else {
2823                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2824                         cmd->t_task_lba = transport_lba_64(cdb);
2825                 }
2826                 if (sector_ret)
2827                         goto out_unsupported_cdb;
2828
2829                 size = transport_get_size(sectors, cdb, cmd);
2830                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2831
2832                 if (passthrough)
2833                         break;
2834
2835                 /*
2836                  * Check to ensure that LBA + Range does not exceed past end of
2837                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2838                  */
2839                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2840                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2841                                 goto out_invalid_cdb_field;
2842                 }
2843                 cmd->execute_cmd = target_emulate_synchronize_cache;
2844                 break;
2845         case UNMAP:
2846                 size = get_unaligned_be16(&cdb[7]);
2847                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2848                 if (!passthrough)
2849                         cmd->execute_cmd = target_emulate_unmap;
2850                 break;
2851         case WRITE_SAME_16:
2852                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2853                 if (sector_ret)
2854                         goto out_unsupported_cdb;
2855
2856                 if (sectors)
2857                         size = transport_get_size(1, cdb, cmd);
2858                 else {
2859                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2860                         goto out_invalid_cdb_field;
2861                 }
2862
2863                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2864                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2865
2866                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2867                         goto out_unsupported_cdb;
2868                 if (!passthrough)
2869                         cmd->execute_cmd = target_emulate_write_same;
2870                 break;
2871         case WRITE_SAME:
2872                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2873                 if (sector_ret)
2874                         goto out_unsupported_cdb;
2875
2876                 if (sectors)
2877                         size = transport_get_size(1, cdb, cmd);
2878                 else {
2879                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2880                         goto out_invalid_cdb_field;
2881                 }
2882
2883                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2884                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2885                 /*
2886                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2887                  * of byte 1 bit 3 UNMAP instead of original reserved field
2888                  */
2889                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2890                         goto out_unsupported_cdb;
2891                 if (!passthrough)
2892                         cmd->execute_cmd = target_emulate_write_same;
2893                 break;
2894         case ALLOW_MEDIUM_REMOVAL:
2895         case ERASE:
2896         case REZERO_UNIT:
2897         case SEEK_10:
2898         case SPACE:
2899         case START_STOP:
2900         case TEST_UNIT_READY:
2901         case VERIFY:
2902         case WRITE_FILEMARKS:
2903                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2904                 if (!passthrough)
2905                         cmd->execute_cmd = target_emulate_noop;
2906                 break;
2907         case GPCMD_CLOSE_TRACK:
2908         case INITIALIZE_ELEMENT_STATUS:
2909         case GPCMD_LOAD_UNLOAD:
2910         case GPCMD_SET_SPEED:
2911         case MOVE_MEDIUM:
2912                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2913                 break;
2914         case REPORT_LUNS:
2915                 cmd->execute_cmd = target_report_luns;
2916                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2917                 /*
2918                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2919                  * See spc4r17 section 5.3
2920                  */
2921                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2922                         cmd->sam_task_attr = MSG_HEAD_TAG;
2923                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2924                 break;
2925         case GET_EVENT_STATUS_NOTIFICATION:
2926                 size = (cdb[7] << 8) | cdb[8];
2927                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2928                 break;
2929         default:
2930                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2931                         " 0x%02x, sending CHECK_CONDITION.\n",
2932                         cmd->se_tfo->get_fabric_name(), cdb[0]);
2933                 goto out_unsupported_cdb;
2934         }
2935
2936         if (cmd->unknown_data_length)
2937                 cmd->data_length = size;
2938
2939         if (size != cmd->data_length) {
2940                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2941                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2942                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
2943                                 cmd->data_length, size, cdb[0]);
2944
2945                 cmd->cmd_spdtl = size;
2946
2947                 if (cmd->data_direction == DMA_TO_DEVICE) {
2948                         pr_err("Rejecting underflow/overflow"
2949                                         " WRITE data\n");
2950                         goto out_invalid_cdb_field;
2951                 }
2952                 /*
2953                  * Reject READ_* or WRITE_* with overflow/underflow for
2954                  * type SCF_SCSI_DATA_SG_IO_CDB.
2955                  */
2956                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
2957                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2958                                 " CDB on non 512-byte sector setup subsystem"
2959                                 " plugin: %s\n", dev->transport->name);
2960                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2961                         goto out_invalid_cdb_field;
2962                 }
2963
2964                 if (size > cmd->data_length) {
2965                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2966                         cmd->residual_count = (size - cmd->data_length);
2967                 } else {
2968                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
2969                         cmd->residual_count = (cmd->data_length - size);
2970                 }
2971                 cmd->data_length = size;
2972         }
2973
2974         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
2975                 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
2976                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2977                                 " big sectors %u exceeds fabric_max_sectors:"
2978                                 " %u\n", cdb[0], sectors,
2979                                 su_dev->se_dev_attrib.fabric_max_sectors);
2980                         goto out_invalid_cdb_field;
2981                 }
2982                 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
2983                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2984                                 " big sectors %u exceeds backend hw_max_sectors:"
2985                                 " %u\n", cdb[0], sectors,
2986                                 su_dev->se_dev_attrib.hw_max_sectors);
2987                         goto out_invalid_cdb_field;
2988                 }
2989         }
2990
2991         /* reject any command that we don't have a handler for */
2992         if (!(passthrough || cmd->execute_cmd ||
2993              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2994                 goto out_unsupported_cdb;
2995
2996         transport_set_supported_SAM_opcode(cmd);
2997         return ret;
2998
2999 out_unsupported_cdb:
3000         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3001         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3002         return -EINVAL;
3003 out_invalid_cdb_field:
3004         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3005         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3006         return -EINVAL;
3007 }
3008
3009 /*
3010  * Called from I/O completion to determine which dormant/delayed
3011  * and ordered cmds need to have their tasks added to the execution queue.
3012  */
3013 static void transport_complete_task_attr(struct se_cmd *cmd)
3014 {
3015         struct se_device *dev = cmd->se_dev;
3016         struct se_cmd *cmd_p, *cmd_tmp;
3017         int new_active_tasks = 0;
3018
3019         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3020                 atomic_dec(&dev->simple_cmds);
3021                 smp_mb__after_atomic_dec();
3022                 dev->dev_cur_ordered_id++;
3023                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3024                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3025                         cmd->se_ordered_id);
3026         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3027                 dev->dev_cur_ordered_id++;
3028                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3029                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3030                         cmd->se_ordered_id);
3031         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3032                 atomic_dec(&dev->dev_ordered_sync);
3033                 smp_mb__after_atomic_dec();
3034
3035                 dev->dev_cur_ordered_id++;
3036                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3037                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3038         }
3039         /*
3040          * Process all commands up to the last received
3041          * ORDERED task attribute which requires another blocking
3042          * boundary
3043          */
3044         spin_lock(&dev->delayed_cmd_lock);
3045         list_for_each_entry_safe(cmd_p, cmd_tmp,
3046                         &dev->delayed_cmd_list, se_delayed_node) {
3047
3048                 list_del(&cmd_p->se_delayed_node);
3049                 spin_unlock(&dev->delayed_cmd_lock);
3050
3051                 pr_debug("Calling add_tasks() for"
3052                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3053                         " Dormant -> Active, se_ordered_id: %u\n",
3054                         cmd_p->t_task_cdb[0],
3055                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3056
3057                 target_add_to_execute_list(cmd_p);
3058                 new_active_tasks++;
3059
3060                 spin_lock(&dev->delayed_cmd_lock);
3061                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3062                         break;
3063         }
3064         spin_unlock(&dev->delayed_cmd_lock);
3065         /*
3066          * If new tasks have become active, wake up the transport thread
3067          * to do the processing of the Active tasks.
3068          */
3069         if (new_active_tasks != 0)
3070                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3071 }
3072
3073 static void transport_complete_qf(struct se_cmd *cmd)
3074 {
3075         int ret = 0;
3076
3077         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3078                 transport_complete_task_attr(cmd);
3079
3080         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3081                 ret = cmd->se_tfo->queue_status(cmd);
3082                 if (ret)
3083                         goto out;
3084         }
3085
3086         switch (cmd->data_direction) {
3087         case DMA_FROM_DEVICE:
3088                 ret = cmd->se_tfo->queue_data_in(cmd);
3089                 break;
3090         case DMA_TO_DEVICE:
3091                 if (cmd->t_bidi_data_sg) {
3092                         ret = cmd->se_tfo->queue_data_in(cmd);
3093                         if (ret < 0)
3094                                 break;
3095                 }
3096                 /* Fall through for DMA_TO_DEVICE */
3097         case DMA_NONE:
3098                 ret = cmd->se_tfo->queue_status(cmd);
3099                 break;
3100         default:
3101                 break;
3102         }
3103
3104 out:
3105         if (ret < 0) {
3106                 transport_handle_queue_full(cmd, cmd->se_dev);
3107                 return;
3108         }
3109         transport_lun_remove_cmd(cmd);
3110         transport_cmd_check_stop_to_fabric(cmd);
3111 }
3112
3113 static void transport_handle_queue_full(
3114         struct se_cmd *cmd,
3115         struct se_device *dev)
3116 {
3117         spin_lock_irq(&dev->qf_cmd_lock);
3118         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3119         atomic_inc(&dev->dev_qf_count);
3120         smp_mb__after_atomic_inc();
3121         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3122
3123         schedule_work(&cmd->se_dev->qf_work_queue);
3124 }
3125
3126 static void target_complete_ok_work(struct work_struct *work)
3127 {
3128         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3129         int reason = 0, ret;
3130
3131         /*
3132          * Check if we need to move delayed/dormant tasks from cmds on the
3133          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3134          * Attribute.
3135          */
3136         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3137                 transport_complete_task_attr(cmd);
3138         /*
3139          * Check to schedule QUEUE_FULL work, or execute an existing
3140          * cmd->transport_qf_callback()
3141          */
3142         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3143                 schedule_work(&cmd->se_dev->qf_work_queue);
3144
3145         /*
3146          * Check if we need to retrieve a sense buffer from
3147          * the struct se_cmd in question.
3148          */
3149         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3150                 if (transport_get_sense_data(cmd) < 0)
3151                         reason = TCM_NON_EXISTENT_LUN;
3152
3153                 if (cmd->scsi_status) {
3154                         ret = transport_send_check_condition_and_sense(
3155                                         cmd, reason, 1);
3156                         if (ret == -EAGAIN || ret == -ENOMEM)
3157                                 goto queue_full;
3158
3159                         transport_lun_remove_cmd(cmd);
3160                         transport_cmd_check_stop_to_fabric(cmd);
3161                         return;
3162                 }
3163         }
3164         /*
3165          * Check for a callback, used by amongst other things
3166          * XDWRITE_READ_10 emulation.
3167          */
3168         if (cmd->transport_complete_callback)
3169                 cmd->transport_complete_callback(cmd);
3170
3171         switch (cmd->data_direction) {
3172         case DMA_FROM_DEVICE:
3173                 spin_lock(&cmd->se_lun->lun_sep_lock);
3174                 if (cmd->se_lun->lun_sep) {
3175                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3176                                         cmd->data_length;
3177                 }
3178                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3179
3180                 ret = cmd->se_tfo->queue_data_in(cmd);
3181                 if (ret == -EAGAIN || ret == -ENOMEM)
3182                         goto queue_full;
3183                 break;
3184         case DMA_TO_DEVICE:
3185                 spin_lock(&cmd->se_lun->lun_sep_lock);
3186                 if (cmd->se_lun->lun_sep) {
3187                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3188                                 cmd->data_length;
3189                 }
3190                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3191                 /*
3192                  * Check if we need to send READ payload for BIDI-COMMAND
3193                  */
3194                 if (cmd->t_bidi_data_sg) {
3195                         spin_lock(&cmd->se_lun->lun_sep_lock);
3196                         if (cmd->se_lun->lun_sep) {
3197                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3198                                         cmd->data_length;
3199                         }
3200                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3201                         ret = cmd->se_tfo->queue_data_in(cmd);
3202                         if (ret == -EAGAIN || ret == -ENOMEM)
3203                                 goto queue_full;
3204                         break;
3205                 }
3206                 /* Fall through for DMA_TO_DEVICE */
3207         case DMA_NONE:
3208                 ret = cmd->se_tfo->queue_status(cmd);
3209                 if (ret == -EAGAIN || ret == -ENOMEM)
3210                         goto queue_full;
3211                 break;
3212         default:
3213                 break;
3214         }
3215
3216         transport_lun_remove_cmd(cmd);
3217         transport_cmd_check_stop_to_fabric(cmd);
3218         return;
3219
3220 queue_full:
3221         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3222                 " data_direction: %d\n", cmd, cmd->data_direction);
3223         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3224         transport_handle_queue_full(cmd, cmd->se_dev);
3225 }
3226
3227 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3228 {
3229         struct scatterlist *sg;
3230         int count;
3231
3232         for_each_sg(sgl, sg, nents, count)
3233                 __free_page(sg_page(sg));
3234
3235         kfree(sgl);
3236 }
3237
3238 static inline void transport_free_pages(struct se_cmd *cmd)
3239 {
3240         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3241                 return;
3242
3243         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3244         cmd->t_data_sg = NULL;
3245         cmd->t_data_nents = 0;
3246
3247         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3248         cmd->t_bidi_data_sg = NULL;
3249         cmd->t_bidi_data_nents = 0;
3250 }
3251
3252 /**
3253  * transport_release_cmd - free a command
3254  * @cmd:       command to free
3255  *
3256  * This routine unconditionally frees a command, and reference counting
3257  * or list removal must be done in the caller.
3258  */
3259 static void transport_release_cmd(struct se_cmd *cmd)
3260 {
3261         BUG_ON(!cmd->se_tfo);
3262
3263         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3264                 core_tmr_release_req(cmd->se_tmr_req);
3265         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3266                 kfree(cmd->t_task_cdb);
3267         /*
3268          * If this cmd has been setup with target_get_sess_cmd(), drop
3269          * the kref and call ->release_cmd() in kref callback.
3270          */
3271          if (cmd->check_release != 0) {
3272                 target_put_sess_cmd(cmd->se_sess, cmd);
3273                 return;
3274         }
3275         cmd->se_tfo->release_cmd(cmd);
3276 }
3277
3278 /**
3279  * transport_put_cmd - release a reference to a command
3280  * @cmd:       command to release
3281  *
3282  * This routine releases our reference to the command and frees it if possible.
3283  */
3284 static void transport_put_cmd(struct se_cmd *cmd)
3285 {
3286         unsigned long flags;
3287
3288         spin_lock_irqsave(&cmd->t_state_lock, flags);
3289         if (atomic_read(&cmd->t_fe_count)) {
3290                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3291                         goto out_busy;
3292         }
3293
3294         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3295                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3296                 target_remove_from_state_list(cmd);
3297         }
3298         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3299
3300         transport_free_pages(cmd);
3301         transport_release_cmd(cmd);
3302         return;
3303 out_busy:
3304         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3305 }
3306
3307 /*
3308  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3309  * allocating in the core.
3310  * @cmd:  Associated se_cmd descriptor
3311  * @mem:  SGL style memory for TCM WRITE / READ
3312  * @sg_mem_num: Number of SGL elements
3313  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3314  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3315  *
3316  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3317  * of parameters.
3318  */
3319 int transport_generic_map_mem_to_cmd(
3320         struct se_cmd *cmd,
3321         struct scatterlist *sgl,
3322         u32 sgl_count,
3323         struct scatterlist *sgl_bidi,
3324         u32 sgl_bidi_count)
3325 {
3326         if (!sgl || !sgl_count)
3327                 return 0;
3328
3329         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3330             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3331                 /*
3332                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3333                  * scatterlists already have been set to follow what the fabric
3334                  * passes for the original expected data transfer length.
3335                  */
3336                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3337                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3338                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3339                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3340                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3341                         return -EINVAL;
3342                 }
3343
3344                 cmd->t_data_sg = sgl;
3345                 cmd->t_data_nents = sgl_count;
3346
3347                 if (sgl_bidi && sgl_bidi_count) {
3348                         cmd->t_bidi_data_sg = sgl_bidi;
3349                         cmd->t_bidi_data_nents = sgl_bidi_count;
3350                 }
3351                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3352         }
3353
3354         return 0;
3355 }
3356 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3357
3358 void *transport_kmap_data_sg(struct se_cmd *cmd)
3359 {
3360         struct scatterlist *sg = cmd->t_data_sg;
3361         struct page **pages;
3362         int i;
3363
3364         BUG_ON(!sg);
3365         /*
3366          * We need to take into account a possible offset here for fabrics like
3367          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3368          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3369          */
3370         if (!cmd->t_data_nents)
3371                 return NULL;
3372         else if (cmd->t_data_nents == 1)
3373                 return kmap(sg_page(sg)) + sg->offset;
3374
3375         /* >1 page. use vmap */
3376         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3377         if (!pages)
3378                 return NULL;
3379
3380         /* convert sg[] to pages[] */
3381         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3382                 pages[i] = sg_page(sg);
3383         }
3384
3385         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3386         kfree(pages);
3387         if (!cmd->t_data_vmap)
3388                 return NULL;
3389
3390         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3391 }
3392 EXPORT_SYMBOL(transport_kmap_data_sg);
3393
3394 void transport_kunmap_data_sg(struct se_cmd *cmd)
3395 {
3396         if (!cmd->t_data_nents) {
3397                 return;
3398         } else if (cmd->t_data_nents == 1) {
3399                 kunmap(sg_page(cmd->t_data_sg));
3400                 return;
3401         }
3402
3403         vunmap(cmd->t_data_vmap);
3404         cmd->t_data_vmap = NULL;
3405 }
3406 EXPORT_SYMBOL(transport_kunmap_data_sg);
3407
3408 static int
3409 transport_generic_get_mem(struct se_cmd *cmd)
3410 {
3411         u32 length = cmd->data_length;
3412         unsigned int nents;
3413         struct page *page;
3414         gfp_t zero_flag;
3415         int i = 0;
3416
3417         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3418         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3419         if (!cmd->t_data_sg)
3420                 return -ENOMEM;
3421
3422         cmd->t_data_nents = nents;
3423         sg_init_table(cmd->t_data_sg, nents);
3424
3425         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3426
3427         while (length) {
3428                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3429                 page = alloc_page(GFP_KERNEL | zero_flag);
3430                 if (!page)
3431                         goto out;
3432
3433                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3434                 length -= page_len;
3435                 i++;
3436         }
3437         return 0;
3438
3439 out:
3440         while (i >= 0) {
3441                 __free_page(sg_page(&cmd->t_data_sg[i]));
3442                 i--;
3443         }
3444         kfree(cmd->t_data_sg);
3445         cmd->t_data_sg = NULL;
3446         return -ENOMEM;
3447 }
3448
3449 /*
3450  * Allocate any required resources to execute the command.  For writes we
3451  * might not have the payload yet, so notify the fabric via a call to
3452  * ->write_pending instead. Otherwise place it on the execution queue.
3453  */
3454 int transport_generic_new_cmd(struct se_cmd *cmd)
3455 {
3456         struct se_device *dev = cmd->se_dev;
3457         int ret = 0;
3458
3459         /*
3460          * Determine is the TCM fabric module has already allocated physical
3461          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3462          * beforehand.
3463          */
3464         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3465             cmd->data_length) {
3466                 ret = transport_generic_get_mem(cmd);
3467                 if (ret < 0)
3468                         goto out_fail;
3469         }
3470
3471         /* Workaround for handling zero-length control CDBs */
3472         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3473             !cmd->data_length) {
3474                 spin_lock_irq(&cmd->t_state_lock);
3475                 cmd->t_state = TRANSPORT_COMPLETE;
3476                 cmd->transport_state |= CMD_T_ACTIVE;
3477                 spin_unlock_irq(&cmd->t_state_lock);
3478
3479                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3480                         u8 ua_asc = 0, ua_ascq = 0;
3481
3482                         core_scsi3_ua_clear_for_request_sense(cmd,
3483                                         &ua_asc, &ua_ascq);
3484                 }
3485
3486                 INIT_WORK(&cmd->work, target_complete_ok_work);
3487                 queue_work(target_completion_wq, &cmd->work);
3488                 return 0;
3489         }
3490
3491         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3492                 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3493
3494                 if (transport_cmd_get_valid_sectors(cmd) < 0)
3495                         return -EINVAL;
3496
3497                 BUG_ON(cmd->data_length % attr->block_size);
3498                 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3499                         attr->hw_max_sectors);
3500         }
3501
3502         atomic_inc(&cmd->t_fe_count);
3503
3504         /*
3505          * For WRITEs, let the fabric know its buffer is ready.
3506          *
3507          * The command will be added to the execution queue after its write
3508          * data has arrived.
3509          */
3510         if (cmd->data_direction == DMA_TO_DEVICE) {
3511                 target_add_to_state_list(cmd);
3512                 return transport_generic_write_pending(cmd);
3513         }
3514         /*
3515          * Everything else but a WRITE, add the command to the execution queue.
3516          */
3517         transport_execute_tasks(cmd);
3518         return 0;
3519
3520 out_fail:
3521         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3522         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3523         return -EINVAL;
3524 }
3525 EXPORT_SYMBOL(transport_generic_new_cmd);
3526
3527 /*      transport_generic_process_write():
3528  *
3529  *
3530  */
3531 void transport_generic_process_write(struct se_cmd *cmd)
3532 {
3533         transport_execute_tasks(cmd);
3534 }
3535 EXPORT_SYMBOL(transport_generic_process_write);
3536
3537 static void transport_write_pending_qf(struct se_cmd *cmd)
3538 {
3539         int ret;
3540
3541         ret = cmd->se_tfo->write_pending(cmd);
3542         if (ret == -EAGAIN || ret == -ENOMEM) {
3543                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3544                          cmd);
3545                 transport_handle_queue_full(cmd, cmd->se_dev);
3546         }
3547 }
3548
3549 static int transport_generic_write_pending(struct se_cmd *cmd)
3550 {
3551         unsigned long flags;
3552         int ret;
3553
3554         spin_lock_irqsave(&cmd->t_state_lock, flags);
3555         cmd->t_state = TRANSPORT_WRITE_PENDING;
3556         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3557
3558         /*
3559          * Clear the se_cmd for WRITE_PENDING status in order to set
3560          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3561          * from HW target mode interrupt code.  This is safe to be called
3562          * with transport_off=1 before the cmd->se_tfo->write_pending
3563          * because the se_cmd->se_lun pointer is not being cleared.
3564          */
3565         transport_cmd_check_stop(cmd, 1, 0);
3566
3567         /*
3568          * Call the fabric write_pending function here to let the
3569          * frontend know that WRITE buffers are ready.
3570          */
3571         ret = cmd->se_tfo->write_pending(cmd);
3572         if (ret == -EAGAIN || ret == -ENOMEM)
3573                 goto queue_full;
3574         else if (ret < 0)
3575                 return ret;
3576
3577         return 1;
3578
3579 queue_full:
3580         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3581         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3582         transport_handle_queue_full(cmd, cmd->se_dev);
3583         return 0;
3584 }
3585
3586 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3587 {
3588         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3589                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3590                          transport_wait_for_tasks(cmd);
3591
3592                 transport_release_cmd(cmd);
3593         } else {
3594                 if (wait_for_tasks)
3595                         transport_wait_for_tasks(cmd);
3596
3597                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3598
3599                 if (cmd->se_lun)
3600                         transport_lun_remove_cmd(cmd);
3601
3602                 transport_put_cmd(cmd);
3603         }
3604 }
3605 EXPORT_SYMBOL(transport_generic_free_cmd);
3606
3607 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3608  * @se_sess:    session to reference
3609  * @se_cmd:     command descriptor to add
3610  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3611  */
3612 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3613                         bool ack_kref)
3614 {
3615         unsigned long flags;
3616
3617         kref_init(&se_cmd->cmd_kref);
3618         /*
3619          * Add a second kref if the fabric caller is expecting to handle
3620          * fabric acknowledgement that requires two target_put_sess_cmd()
3621          * invocations before se_cmd descriptor release.
3622          */
3623         if (ack_kref == true) {
3624                 kref_get(&se_cmd->cmd_kref);
3625                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3626         }
3627
3628         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3629         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3630         se_cmd->check_release = 1;
3631         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3632 }
3633 EXPORT_SYMBOL(target_get_sess_cmd);
3634
3635 static void target_release_cmd_kref(struct kref *kref)
3636 {
3637         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3638         struct se_session *se_sess = se_cmd->se_sess;
3639         unsigned long flags;
3640
3641         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3642         if (list_empty(&se_cmd->se_cmd_list)) {
3643                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3644                 se_cmd->se_tfo->release_cmd(se_cmd);
3645                 return;
3646         }
3647         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3648                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3649                 complete(&se_cmd->cmd_wait_comp);
3650                 return;
3651         }
3652         list_del(&se_cmd->se_cmd_list);
3653         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3654
3655         se_cmd->se_tfo->release_cmd(se_cmd);
3656 }
3657
3658 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3659  * @se_sess:    session to reference
3660  * @se_cmd:     command descriptor to drop
3661  */
3662 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3663 {
3664         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3665 }
3666 EXPORT_SYMBOL(target_put_sess_cmd);
3667
3668 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3669  * @se_sess:    session to split
3670  */
3671 void target_splice_sess_cmd_list(struct se_session *se_sess)
3672 {
3673         struct se_cmd *se_cmd;
3674         unsigned long flags;
3675
3676         WARN_ON(!list_empty(&se_sess->sess_wait_list));
3677         INIT_LIST_HEAD(&se_sess->sess_wait_list);
3678
3679         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3680         se_sess->sess_tearing_down = 1;
3681
3682         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3683
3684         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3685                 se_cmd->cmd_wait_set = 1;
3686
3687         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3688 }
3689 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3690
3691 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3692  * @se_sess:    session to wait for active I/O
3693  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
3694  */
3695 void target_wait_for_sess_cmds(
3696         struct se_session *se_sess,
3697         int wait_for_tasks)
3698 {
3699         struct se_cmd *se_cmd, *tmp_cmd;
3700         bool rc = false;
3701
3702         list_for_each_entry_safe(se_cmd, tmp_cmd,
3703                                 &se_sess->sess_wait_list, se_cmd_list) {
3704                 list_del(&se_cmd->se_cmd_list);
3705
3706                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3707                         " %d\n", se_cmd, se_cmd->t_state,
3708                         se_cmd->se_tfo->get_cmd_state(se_cmd));
3709
3710                 if (wait_for_tasks) {
3711                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3712                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3713                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3714
3715                         rc = transport_wait_for_tasks(se_cmd);
3716
3717                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3718                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3719                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3720                 }
3721
3722                 if (!rc) {
3723                         wait_for_completion(&se_cmd->cmd_wait_comp);
3724                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3725                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3726                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3727                 }
3728
3729                 se_cmd->se_tfo->release_cmd(se_cmd);
3730         }
3731 }
3732 EXPORT_SYMBOL(target_wait_for_sess_cmds);
3733
3734 /*      transport_lun_wait_for_tasks():
3735  *
3736  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
3737  *      an struct se_lun to be successfully shutdown.
3738  */
3739 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3740 {
3741         unsigned long flags;
3742         int ret = 0;
3743
3744         /*
3745          * If the frontend has already requested this struct se_cmd to
3746          * be stopped, we can safely ignore this struct se_cmd.
3747          */
3748         spin_lock_irqsave(&cmd->t_state_lock, flags);
3749         if (cmd->transport_state & CMD_T_STOP) {
3750                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3751
3752                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3753                          cmd->se_tfo->get_task_tag(cmd));
3754                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3755                 transport_cmd_check_stop(cmd, 1, 0);
3756                 return -EPERM;
3757         }
3758         cmd->transport_state |= CMD_T_LUN_FE_STOP;
3759         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3760
3761         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3762
3763         // XXX: audit task_flags checks.
3764         spin_lock_irqsave(&cmd->t_state_lock, flags);
3765         if ((cmd->transport_state & CMD_T_BUSY) &&
3766             (cmd->transport_state & CMD_T_SENT)) {
3767                 if (!target_stop_cmd(cmd, &flags))
3768                         ret++;
3769                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3770         } else {
3771                 spin_unlock_irqrestore(&cmd->t_state_lock,
3772                                 flags);
3773                 target_remove_from_execute_list(cmd);
3774         }
3775
3776         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3777                         " %d\n", cmd, ret);
3778         if (!ret) {
3779                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3780                                 cmd->se_tfo->get_task_tag(cmd));
3781                 wait_for_completion(&cmd->transport_lun_stop_comp);
3782                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3783                                 cmd->se_tfo->get_task_tag(cmd));
3784         }
3785         transport_remove_cmd_from_queue(cmd);
3786
3787         return 0;
3788 }
3789
3790 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3791 {
3792         struct se_cmd *cmd = NULL;
3793         unsigned long lun_flags, cmd_flags;
3794         /*
3795          * Do exception processing and return CHECK_CONDITION status to the
3796          * Initiator Port.
3797          */
3798         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3799         while (!list_empty(&lun->lun_cmd_list)) {
3800                 cmd = list_first_entry(&lun->lun_cmd_list,
3801                        struct se_cmd, se_lun_node);
3802                 list_del_init(&cmd->se_lun_node);
3803
3804                 /*
3805                  * This will notify iscsi_target_transport.c:
3806                  * transport_cmd_check_stop() that a LUN shutdown is in
3807                  * progress for the iscsi_cmd_t.
3808                  */
3809                 spin_lock(&cmd->t_state_lock);
3810                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3811                         "_lun_stop for  ITT: 0x%08x\n",
3812                         cmd->se_lun->unpacked_lun,
3813                         cmd->se_tfo->get_task_tag(cmd));
3814                 cmd->transport_state |= CMD_T_LUN_STOP;
3815                 spin_unlock(&cmd->t_state_lock);
3816
3817                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3818
3819                 if (!cmd->se_lun) {
3820                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3821                                 cmd->se_tfo->get_task_tag(cmd),
3822                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3823                         BUG();
3824                 }
3825                 /*
3826                  * If the Storage engine still owns the iscsi_cmd_t, determine
3827                  * and/or stop its context.
3828                  */
3829                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3830                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3831                         cmd->se_tfo->get_task_tag(cmd));
3832
3833                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3834                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3835                         continue;
3836                 }
3837
3838                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3839                         "_wait_for_tasks(): SUCCESS\n",
3840                         cmd->se_lun->unpacked_lun,
3841                         cmd->se_tfo->get_task_tag(cmd));
3842
3843                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3844                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3845                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3846                         goto check_cond;
3847                 }
3848                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3849                 target_remove_from_state_list(cmd);
3850                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3851
3852                 /*
3853                  * The Storage engine stopped this struct se_cmd before it was
3854                  * send to the fabric frontend for delivery back to the
3855                  * Initiator Node.  Return this SCSI CDB back with an
3856                  * CHECK_CONDITION status.
3857                  */
3858 check_cond:
3859                 transport_send_check_condition_and_sense(cmd,
3860                                 TCM_NON_EXISTENT_LUN, 0);
3861                 /*
3862                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
3863                  * be released, notify the waiting thread now that LU has
3864                  * finished accessing it.
3865                  */
3866                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3867                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3868                         pr_debug("SE_LUN[%d] - Detected FE stop for"
3869                                 " struct se_cmd: %p ITT: 0x%08x\n",
3870                                 lun->unpacked_lun,
3871                                 cmd, cmd->se_tfo->get_task_tag(cmd));
3872
3873                         spin_unlock_irqrestore(&cmd->t_state_lock,
3874                                         cmd_flags);
3875                         transport_cmd_check_stop(cmd, 1, 0);
3876                         complete(&cmd->transport_lun_fe_stop_comp);
3877                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3878                         continue;
3879                 }
3880                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3881                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3882
3883                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3884                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3885         }
3886         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3887 }
3888
3889 static int transport_clear_lun_thread(void *p)
3890 {
3891         struct se_lun *lun = p;
3892
3893         __transport_clear_lun_from_sessions(lun);
3894         complete(&lun->lun_shutdown_comp);
3895
3896         return 0;
3897 }
3898
3899 int transport_clear_lun_from_sessions(struct se_lun *lun)
3900 {
3901         struct task_struct *kt;
3902
3903         kt = kthread_run(transport_clear_lun_thread, lun,
3904                         "tcm_cl_%u", lun->unpacked_lun);
3905         if (IS_ERR(kt)) {
3906                 pr_err("Unable to start clear_lun thread\n");
3907                 return PTR_ERR(kt);
3908         }
3909         wait_for_completion(&lun->lun_shutdown_comp);
3910
3911         return 0;
3912 }
3913
3914 /**
3915  * transport_wait_for_tasks - wait for completion to occur
3916  * @cmd:        command to wait
3917  *
3918  * Called from frontend fabric context to wait for storage engine
3919  * to pause and/or release frontend generated struct se_cmd.
3920  */
3921 bool transport_wait_for_tasks(struct se_cmd *cmd)
3922 {
3923         unsigned long flags;
3924
3925         spin_lock_irqsave(&cmd->t_state_lock, flags);
3926         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3927             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3928                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3929                 return false;
3930         }
3931         /*
3932          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3933          * has been set in transport_set_supported_SAM_opcode().
3934          */
3935         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3936             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3937                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3938                 return false;
3939         }
3940         /*
3941          * If we are already stopped due to an external event (ie: LUN shutdown)
3942          * sleep until the connection can have the passed struct se_cmd back.
3943          * The cmd->transport_lun_stopped_sem will be upped by
3944          * transport_clear_lun_from_sessions() once the ConfigFS context caller
3945          * has completed its operation on the struct se_cmd.
3946          */
3947         if (cmd->transport_state & CMD_T_LUN_STOP) {
3948                 pr_debug("wait_for_tasks: Stopping"
3949                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3950                         "_stop_comp); for ITT: 0x%08x\n",
3951                         cmd->se_tfo->get_task_tag(cmd));
3952                 /*
3953                  * There is a special case for WRITES where a FE exception +
3954                  * LUN shutdown means ConfigFS context is still sleeping on
3955                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3956                  * We go ahead and up transport_lun_stop_comp just to be sure
3957                  * here.
3958                  */
3959                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3960                 complete(&cmd->transport_lun_stop_comp);
3961                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3962                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3963
3964                 target_remove_from_state_list(cmd);
3965                 /*
3966                  * At this point, the frontend who was the originator of this
3967                  * struct se_cmd, now owns the structure and can be released through
3968                  * normal means below.
3969                  */
3970                 pr_debug("wait_for_tasks: Stopped"
3971                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
3972                         "stop_comp); for ITT: 0x%08x\n",
3973                         cmd->se_tfo->get_task_tag(cmd));
3974
3975                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3976         }
3977
3978         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
3979                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3980                 return false;
3981         }
3982
3983         cmd->transport_state |= CMD_T_STOP;
3984
3985         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
3986                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
3987                 cmd, cmd->se_tfo->get_task_tag(cmd),
3988                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3989
3990         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3991
3992         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3993
3994         wait_for_completion(&cmd->t_transport_stop_comp);
3995
3996         spin_lock_irqsave(&cmd->t_state_lock, flags);
3997         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
3998
3999         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4000                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4001                 cmd->se_tfo->get_task_tag(cmd));
4002
4003         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4004
4005         return true;
4006 }
4007 EXPORT_SYMBOL(transport_wait_for_tasks);
4008
4009 static int transport_get_sense_codes(
4010         struct se_cmd *cmd,
4011         u8 *asc,
4012         u8 *ascq)
4013 {
4014         *asc = cmd->scsi_asc;
4015         *ascq = cmd->scsi_ascq;
4016
4017         return 0;
4018 }
4019
4020 static int transport_set_sense_codes(
4021         struct se_cmd *cmd,
4022         u8 asc,
4023         u8 ascq)
4024 {
4025         cmd->scsi_asc = asc;
4026         cmd->scsi_ascq = ascq;
4027
4028         return 0;
4029 }
4030
4031 int transport_send_check_condition_and_sense(
4032         struct se_cmd *cmd,
4033         u8 reason,
4034         int from_transport)
4035 {
4036         unsigned char *buffer = cmd->sense_buffer;
4037         unsigned long flags;
4038         int offset;
4039         u8 asc = 0, ascq = 0;
4040
4041         spin_lock_irqsave(&cmd->t_state_lock, flags);
4042         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4043                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4044                 return 0;
4045         }
4046         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4047         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4048
4049         if (!reason && from_transport)
4050                 goto after_reason;
4051
4052         if (!from_transport)
4053                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4054         /*
4055          * Data Segment and SenseLength of the fabric response PDU.
4056          *
4057          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4058          * from include/scsi/scsi_cmnd.h
4059          */
4060         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4061                                 TRANSPORT_SENSE_BUFFER);
4062         /*
4063          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4064          * SENSE KEY values from include/scsi/scsi.h
4065          */
4066         switch (reason) {
4067         case TCM_NON_EXISTENT_LUN:
4068                 /* CURRENT ERROR */
4069                 buffer[offset] = 0x70;
4070                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4071                 /* ILLEGAL REQUEST */
4072                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4073                 /* LOGICAL UNIT NOT SUPPORTED */
4074                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4075                 break;
4076         case TCM_UNSUPPORTED_SCSI_OPCODE:
4077         case TCM_SECTOR_COUNT_TOO_MANY:
4078                 /* CURRENT ERROR */
4079                 buffer[offset] = 0x70;
4080                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4081                 /* ILLEGAL REQUEST */
4082                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4083                 /* INVALID COMMAND OPERATION CODE */
4084                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4085                 break;
4086         case TCM_UNKNOWN_MODE_PAGE:
4087                 /* CURRENT ERROR */
4088                 buffer[offset] = 0x70;
4089                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4090                 /* ILLEGAL REQUEST */
4091                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4092                 /* INVALID FIELD IN CDB */
4093                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4094                 break;
4095         case TCM_CHECK_CONDITION_ABORT_CMD:
4096                 /* CURRENT ERROR */
4097                 buffer[offset] = 0x70;
4098                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4099                 /* ABORTED COMMAND */
4100                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4101                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4102                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4103                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4104                 break;
4105         case TCM_INCORRECT_AMOUNT_OF_DATA:
4106                 /* CURRENT ERROR */
4107                 buffer[offset] = 0x70;
4108                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4109                 /* ABORTED COMMAND */
4110                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4111                 /* WRITE ERROR */
4112                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4113                 /* NOT ENOUGH UNSOLICITED DATA */
4114                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4115                 break;
4116         case TCM_INVALID_CDB_FIELD:
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 FIELD IN CDB */
4123                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4124                 break;
4125         case TCM_INVALID_PARAMETER_LIST:
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 PARAMETER LIST */
4132                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4133                 break;
4134         case TCM_UNEXPECTED_UNSOLICITED_DATA:
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                 /* WRITE ERROR */
4141                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4142                 /* UNEXPECTED_UNSOLICITED_DATA */
4143                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4144                 break;
4145         case TCM_SERVICE_CRC_ERROR:
4146                 /* CURRENT ERROR */
4147                 buffer[offset] = 0x70;
4148                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4149                 /* ABORTED COMMAND */
4150                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4151                 /* PROTOCOL SERVICE CRC ERROR */
4152                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4153                 /* N/A */
4154                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4155                 break;
4156         case TCM_SNACK_REJECTED:
4157                 /* CURRENT ERROR */
4158                 buffer[offset] = 0x70;
4159                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4160                 /* ABORTED COMMAND */
4161                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4162                 /* READ ERROR */
4163                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4164                 /* FAILED RETRANSMISSION REQUEST */
4165                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4166                 break;
4167         case TCM_WRITE_PROTECTED:
4168                 /* CURRENT ERROR */
4169                 buffer[offset] = 0x70;
4170                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4171                 /* DATA PROTECT */
4172                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4173                 /* WRITE PROTECTED */
4174                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4175                 break;
4176         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4177                 /* CURRENT ERROR */
4178                 buffer[offset] = 0x70;
4179                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4180                 /* UNIT ATTENTION */
4181                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4182                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4183                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4184                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4185                 break;
4186         case TCM_CHECK_CONDITION_NOT_READY:
4187                 /* CURRENT ERROR */
4188                 buffer[offset] = 0x70;
4189                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4190                 /* Not Ready */
4191                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4192                 transport_get_sense_codes(cmd, &asc, &ascq);
4193                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4194                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4195                 break;
4196         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4197         default:
4198                 /* CURRENT ERROR */
4199                 buffer[offset] = 0x70;
4200                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4201                 /* ILLEGAL REQUEST */
4202                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4203                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4204                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4205                 break;
4206         }
4207         /*
4208          * This code uses linux/include/scsi/scsi.h SAM status codes!
4209          */
4210         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4211         /*
4212          * Automatically padded, this value is encoded in the fabric's
4213          * data_length response PDU containing the SCSI defined sense data.
4214          */
4215         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4216
4217 after_reason:
4218         return cmd->se_tfo->queue_status(cmd);
4219 }
4220 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4221
4222 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4223 {
4224         int ret = 0;
4225
4226         if (cmd->transport_state & CMD_T_ABORTED) {
4227                 if (!send_status ||
4228                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4229                         return 1;
4230
4231                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4232                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4233                         cmd->t_task_cdb[0],
4234                         cmd->se_tfo->get_task_tag(cmd));
4235
4236                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4237                 cmd->se_tfo->queue_status(cmd);
4238                 ret = 1;
4239         }
4240         return ret;
4241 }
4242 EXPORT_SYMBOL(transport_check_aborted_status);
4243
4244 void transport_send_task_abort(struct se_cmd *cmd)
4245 {
4246         unsigned long flags;
4247
4248         spin_lock_irqsave(&cmd->t_state_lock, flags);
4249         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4250                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4251                 return;
4252         }
4253         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4254
4255         /*
4256          * If there are still expected incoming fabric WRITEs, we wait
4257          * until until they have completed before sending a TASK_ABORTED
4258          * response.  This response with TASK_ABORTED status will be
4259          * queued back to fabric module by transport_check_aborted_status().
4260          */
4261         if (cmd->data_direction == DMA_TO_DEVICE) {
4262                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4263                         cmd->transport_state |= CMD_T_ABORTED;
4264                         smp_mb__after_atomic_inc();
4265                 }
4266         }
4267         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4268
4269         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4270                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4271                 cmd->se_tfo->get_task_tag(cmd));
4272
4273         cmd->se_tfo->queue_status(cmd);
4274 }
4275
4276 static int transport_generic_do_tmr(struct se_cmd *cmd)
4277 {
4278         struct se_device *dev = cmd->se_dev;
4279         struct se_tmr_req *tmr = cmd->se_tmr_req;
4280         int ret;
4281
4282         switch (tmr->function) {
4283         case TMR_ABORT_TASK:
4284                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
4285                 break;
4286         case TMR_ABORT_TASK_SET:
4287         case TMR_CLEAR_ACA:
4288         case TMR_CLEAR_TASK_SET:
4289                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4290                 break;
4291         case TMR_LUN_RESET:
4292                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4293                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4294                                          TMR_FUNCTION_REJECTED;
4295                 break;
4296         case TMR_TARGET_WARM_RESET:
4297                 tmr->response = TMR_FUNCTION_REJECTED;
4298                 break;
4299         case TMR_TARGET_COLD_RESET:
4300                 tmr->response = TMR_FUNCTION_REJECTED;
4301                 break;
4302         default:
4303                 pr_err("Uknown TMR function: 0x%02x.\n",
4304                                 tmr->function);
4305                 tmr->response = TMR_FUNCTION_REJECTED;
4306                 break;
4307         }
4308
4309         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4310         cmd->se_tfo->queue_tm_rsp(cmd);
4311
4312         transport_cmd_check_stop_to_fabric(cmd);
4313         return 0;
4314 }
4315
4316 /*      transport_processing_thread():
4317  *
4318  *
4319  */
4320 static int transport_processing_thread(void *param)
4321 {
4322         int ret;
4323         struct se_cmd *cmd;
4324         struct se_device *dev = param;
4325
4326         while (!kthread_should_stop()) {
4327                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4328                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4329                                 kthread_should_stop());
4330                 if (ret < 0)
4331                         goto out;
4332
4333 get_cmd:
4334                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4335                 if (!cmd)
4336                         continue;
4337
4338                 switch (cmd->t_state) {
4339                 case TRANSPORT_NEW_CMD:
4340                         BUG();
4341                         break;
4342                 case TRANSPORT_NEW_CMD_MAP:
4343                         if (!cmd->se_tfo->new_cmd_map) {
4344                                 pr_err("cmd->se_tfo->new_cmd_map is"
4345                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4346                                 BUG();
4347                         }
4348                         ret = cmd->se_tfo->new_cmd_map(cmd);
4349                         if (ret < 0) {
4350                                 transport_generic_request_failure(cmd);
4351                                 break;
4352                         }
4353                         ret = transport_generic_new_cmd(cmd);
4354                         if (ret < 0) {
4355                                 transport_generic_request_failure(cmd);
4356                                 break;
4357                         }
4358                         break;
4359                 case TRANSPORT_PROCESS_WRITE:
4360                         transport_generic_process_write(cmd);
4361                         break;
4362                 case TRANSPORT_PROCESS_TMR:
4363                         transport_generic_do_tmr(cmd);
4364                         break;
4365                 case TRANSPORT_COMPLETE_QF_WP:
4366                         transport_write_pending_qf(cmd);
4367                         break;
4368                 case TRANSPORT_COMPLETE_QF_OK:
4369                         transport_complete_qf(cmd);
4370                         break;
4371                 default:
4372                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4373                                 "i_state: %d on SE LUN: %u\n",
4374                                 cmd->t_state,
4375                                 cmd->se_tfo->get_task_tag(cmd),
4376                                 cmd->se_tfo->get_cmd_state(cmd),
4377                                 cmd->se_lun->unpacked_lun);
4378                         BUG();
4379                 }
4380
4381                 goto get_cmd;
4382         }
4383
4384 out:
4385         WARN_ON(!list_empty(&dev->state_list));
4386         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4387         dev->process_thread = NULL;
4388         return 0;
4389 }