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 int target_put_session(struct se_session *se_sess)
 334 {
 335         return 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  MaxSectors: %u\n",
 874                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 875         *bl += sprintf(b + *bl, "        ");
 876 }
 877
 878 void transport_dump_vpd_proto_id(
 879         struct t10_vpd *vpd,
 880         unsigned char *p_buf,
 881         int p_buf_len)
 882 {
 883         unsigned char buf[VPD_TMP_BUF_SIZE];
 884         int len;
 885
 886         memset(buf, 0, VPD_TMP_BUF_SIZE);
 887         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 888
 889         switch (vpd->protocol_identifier) {
 890         case 0x00:
 891                 sprintf(buf+len, "Fibre Channel\n");
 892                 break;
 893         case 0x10:
 894                 sprintf(buf+len, "Parallel SCSI\n");
 895                 break;
 896         case 0x20:
 897                 sprintf(buf+len, "SSA\n");
 898                 break;
 899         case 0x30:
 900                 sprintf(buf+len, "IEEE 1394\n");
 901                 break;
 902         case 0x40:
 903                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
 904                                 " Protocol\n");
 905                 break;
 906         case 0x50:
 907                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 908                 break;
 909         case 0x60:
 910                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 911                 break;
 912         case 0x70:
 913                 sprintf(buf+len, "Automation/Drive Interface Transport"
 914                                 " Protocol\n");
 915                 break;
 916         case 0x80:
 917                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 918                 break;
 919         default:
 920                 sprintf(buf+len, "Unknown 0x%02x\n",
 921                                 vpd->protocol_identifier);
 922                 break;
 923         }
 924
 925         if (p_buf)
 926                 strncpy(p_buf, buf, p_buf_len);
 927         else
 928                 pr_debug("%s", buf);
 929 }
 930
 931 void
 932 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 933 {
 934         /*
 935          * Check if the Protocol Identifier Valid (PIV) bit is set..
 936          *
 937          * from spc3r23.pdf section 7.5.1
 938          */
 939          if (page_83[1] & 0x80) {
 940                 vpd->protocol_identifier = (page_83[0] & 0xf0);
 941                 vpd->protocol_identifier_set = 1;
 942                 transport_dump_vpd_proto_id(vpd, NULL, 0);
 943         }
 944 }
 945 EXPORT_SYMBOL(transport_set_vpd_proto_id);
 946
 947 int transport_dump_vpd_assoc(
 948         struct t10_vpd *vpd,
 949         unsigned char *p_buf,
 950         int p_buf_len)
 951 {
 952         unsigned char buf[VPD_TMP_BUF_SIZE];
 953         int ret = 0;
 954         int len;
 955
 956         memset(buf, 0, VPD_TMP_BUF_SIZE);
 957         len = sprintf(buf, "T10 VPD Identifier Association: ");
 958
 959         switch (vpd->association) {
 960         case 0x00:
 961                 sprintf(buf+len, "addressed logical unit\n");
 962                 break;
 963         case 0x10:
 964                 sprintf(buf+len, "target port\n");
 965                 break;
 966         case 0x20:
 967                 sprintf(buf+len, "SCSI target device\n");
 968                 break;
 969         default:
 970                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 971                 ret = -EINVAL;
 972                 break;
 973         }
 974
 975         if (p_buf)
 976                 strncpy(p_buf, buf, p_buf_len);
 977         else
 978                 pr_debug("%s", buf);
 979
 980         return ret;
 981 }
 982
 983 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 984 {
 985         /*
 986          * The VPD identification association..
 987          *
 988          * from spc3r23.pdf Section 7.6.3.1 Table 297
 989          */
 990         vpd->association = (page_83[1] & 0x30);
 991         return transport_dump_vpd_assoc(vpd, NULL, 0);
 992 }
 993 EXPORT_SYMBOL(transport_set_vpd_assoc);
 994
 995 int transport_dump_vpd_ident_type(
 996         struct t10_vpd *vpd,
 997         unsigned char *p_buf,
 998         int p_buf_len)
 999 {
1000         unsigned char buf[VPD_TMP_BUF_SIZE];
1001         int ret = 0;
1002         int len;
1003
1004         memset(buf, 0, VPD_TMP_BUF_SIZE);
1005         len = sprintf(buf, "T10 VPD Identifier Type: ");
1006
1007         switch (vpd->device_identifier_type) {
1008         case 0x00:
1009                 sprintf(buf+len, "Vendor specific\n");
1010                 break;
1011         case 0x01:
1012                 sprintf(buf+len, "T10 Vendor ID based\n");
1013                 break;
1014         case 0x02:
1015                 sprintf(buf+len, "EUI-64 based\n");
1016                 break;
1017         case 0x03:
1018                 sprintf(buf+len, "NAA\n");
1019                 break;
1020         case 0x04:
1021                 sprintf(buf+len, "Relative target port identifier\n");
1022                 break;
1023         case 0x08:
1024                 sprintf(buf+len, "SCSI name string\n");
1025                 break;
1026         default:
1027                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1028                                 vpd->device_identifier_type);
1029                 ret = -EINVAL;
1030                 break;
1031         }
1032
1033         if (p_buf) {
1034                 if (p_buf_len < strlen(buf)+1)
1035                         return -EINVAL;
1036                 strncpy(p_buf, buf, p_buf_len);
1037         } else {
1038                 pr_debug("%s", buf);
1039         }
1040
1041         return ret;
1042 }
1043
1044 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1045 {
1046         /*
1047          * The VPD identifier type..
1048          *
1049          * from spc3r23.pdf Section 7.6.3.1 Table 298
1050          */
1051         vpd->device_identifier_type = (page_83[1] & 0x0f);
1052         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1053 }
1054 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1055
1056 int transport_dump_vpd_ident(
1057         struct t10_vpd *vpd,
1058         unsigned char *p_buf,
1059         int p_buf_len)
1060 {
1061         unsigned char buf[VPD_TMP_BUF_SIZE];
1062         int ret = 0;
1063
1064         memset(buf, 0, VPD_TMP_BUF_SIZE);
1065
1066         switch (vpd->device_identifier_code_set) {
1067         case 0x01: /* Binary */
1068                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1069                         &vpd->device_identifier[0]);
1070                 break;
1071         case 0x02: /* ASCII */
1072                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1073                         &vpd->device_identifier[0]);
1074                 break;
1075         case 0x03: /* UTF-8 */
1076                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1077                         &vpd->device_identifier[0]);
1078                 break;
1079         default:
1080                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1081                         " 0x%02x", vpd->device_identifier_code_set);
1082                 ret = -EINVAL;
1083                 break;
1084         }
1085
1086         if (p_buf)
1087                 strncpy(p_buf, buf, p_buf_len);
1088         else
1089                 pr_debug("%s", buf);
1090
1091         return ret;
1092 }
1093
1094 int
1095 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1096 {
1097         static const char hex_str[] = "0123456789abcdef";
1098         int j = 0, i = 4; /* offset to start of the identifer */
1099
1100         /*
1101          * The VPD Code Set (encoding)
1102          *
1103          * from spc3r23.pdf Section 7.6.3.1 Table 296
1104          */
1105         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1106         switch (vpd->device_identifier_code_set) {
1107         case 0x01: /* Binary */
1108                 vpd->device_identifier[j++] =
1109                                 hex_str[vpd->device_identifier_type];
1110                 while (i < (4 + page_83[3])) {
1111                         vpd->device_identifier[j++] =
1112                                 hex_str[(page_83[i] & 0xf0) >> 4];
1113                         vpd->device_identifier[j++] =
1114                                 hex_str[page_83[i] & 0x0f];
1115                         i++;
1116                 }
1117                 break;
1118         case 0x02: /* ASCII */
1119         case 0x03: /* UTF-8 */
1120                 while (i < (4 + page_83[3]))
1121                         vpd->device_identifier[j++] = page_83[i++];
1122                 break;
1123         default:
1124                 break;
1125         }
1126
1127         return transport_dump_vpd_ident(vpd, NULL, 0);
1128 }
1129 EXPORT_SYMBOL(transport_set_vpd_ident);
1130
1131 static void core_setup_task_attr_emulation(struct se_device *dev)
1132 {
1133         /*
1134          * If this device is from Target_Core_Mod/pSCSI, disable the
1135          * SAM Task Attribute emulation.
1136          *
1137          * This is currently not available in upsream Linux/SCSI Target
1138          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1139          */
1140         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1141                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1142                 return;
1143         }
1144
1145         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1146         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1147                 " device\n", dev->transport->name,
1148                 dev->transport->get_device_rev(dev));
1149 }
1150
1151 static void scsi_dump_inquiry(struct se_device *dev)
1152 {
1153         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1154         char buf[17];
1155         int i, device_type;
1156         /*
1157          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1158          */
1159         for (i = 0; i < 8; i++)
1160                 if (wwn->vendor[i] >= 0x20)
1161                         buf[i] = wwn->vendor[i];
1162                 else
1163                         buf[i] = ' ';
1164         buf[i] = '\0';
1165         pr_debug("  Vendor: %s\n", buf);
1166
1167         for (i = 0; i < 16; i++)
1168                 if (wwn->model[i] >= 0x20)
1169                         buf[i] = wwn->model[i];
1170                 else
1171                         buf[i] = ' ';
1172         buf[i] = '\0';
1173         pr_debug("  Model: %s\n", buf);
1174
1175         for (i = 0; i < 4; i++)
1176                 if (wwn->revision[i] >= 0x20)
1177                         buf[i] = wwn->revision[i];
1178                 else
1179                         buf[i] = ' ';
1180         buf[i] = '\0';
1181         pr_debug("  Revision: %s\n", buf);
1182
1183         device_type = dev->transport->get_device_type(dev);
1184         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1185         pr_debug("                 ANSI SCSI revision: %02x\n",
1186                                 dev->transport->get_device_rev(dev));
1187 }
1188
1189 struct se_device *transport_add_device_to_core_hba(
1190         struct se_hba *hba,
1191         struct se_subsystem_api *transport,
1192         struct se_subsystem_dev *se_dev,
1193         u32 device_flags,
1194         void *transport_dev,
1195         struct se_dev_limits *dev_limits,
1196         const char *inquiry_prod,
1197         const char *inquiry_rev)
1198 {
1199         int force_pt;
1200         struct se_device  *dev;
1201
1202         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1203         if (!dev) {
1204                 pr_err("Unable to allocate memory for se_dev_t\n");
1205                 return NULL;
1206         }
1207
1208         transport_init_queue_obj(&dev->dev_queue_obj);
1209         dev->dev_flags          = device_flags;
1210         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1211         dev->dev_ptr            = transport_dev;
1212         dev->se_hba             = hba;
1213         dev->se_sub_dev         = se_dev;
1214         dev->transport          = transport;
1215         INIT_LIST_HEAD(&dev->dev_list);
1216         INIT_LIST_HEAD(&dev->dev_sep_list);
1217         INIT_LIST_HEAD(&dev->dev_tmr_list);
1218         INIT_LIST_HEAD(&dev->execute_list);
1219         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1220         INIT_LIST_HEAD(&dev->state_list);
1221         INIT_LIST_HEAD(&dev->qf_cmd_list);
1222         spin_lock_init(&dev->execute_task_lock);
1223         spin_lock_init(&dev->delayed_cmd_lock);
1224         spin_lock_init(&dev->dev_reservation_lock);
1225         spin_lock_init(&dev->dev_status_lock);
1226         spin_lock_init(&dev->se_port_lock);
1227         spin_lock_init(&dev->se_tmr_lock);
1228         spin_lock_init(&dev->qf_cmd_lock);
1229         atomic_set(&dev->dev_ordered_id, 0);
1230
1231         se_dev_set_default_attribs(dev, dev_limits);
1232
1233         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1234         dev->creation_time = get_jiffies_64();
1235         spin_lock_init(&dev->stats_lock);
1236
1237         spin_lock(&hba->device_lock);
1238         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1239         hba->dev_count++;
1240         spin_unlock(&hba->device_lock);
1241         /*
1242          * Setup the SAM Task Attribute emulation for struct se_device
1243          */
1244         core_setup_task_attr_emulation(dev);
1245         /*
1246          * Force PR and ALUA passthrough emulation with internal object use.
1247          */
1248         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1249         /*
1250          * Setup the Reservations infrastructure for struct se_device
1251          */
1252         core_setup_reservations(dev, force_pt);
1253         /*
1254          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1255          */
1256         if (core_setup_alua(dev, force_pt) < 0)
1257                 goto out;
1258
1259         /*
1260          * Startup the struct se_device processing thread
1261          */
1262         dev->process_thread = kthread_run(transport_processing_thread, dev,
1263                                           "LIO_%s", dev->transport->name);
1264         if (IS_ERR(dev->process_thread)) {
1265                 pr_err("Unable to create kthread: LIO_%s\n",
1266                         dev->transport->name);
1267                 goto out;
1268         }
1269         /*
1270          * Setup work_queue for QUEUE_FULL
1271          */
1272         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1273         /*
1274          * Preload the initial INQUIRY const values if we are doing
1275          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1276          * passthrough because this is being provided by the backend LLD.
1277          * This is required so that transport_get_inquiry() copies these
1278          * originals once back into DEV_T10_WWN(dev) for the virtual device
1279          * setup.
1280          */
1281         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1282                 if (!inquiry_prod || !inquiry_rev) {
1283                         pr_err("All non TCM/pSCSI plugins require"
1284                                 " INQUIRY consts\n");
1285                         goto out;
1286                 }
1287
1288                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1289                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1290                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1291         }
1292         scsi_dump_inquiry(dev);
1293
1294         return dev;
1295 out:
1296         kthread_stop(dev->process_thread);
1297
1298         spin_lock(&hba->device_lock);
1299         list_del(&dev->dev_list);
1300         hba->dev_count--;
1301         spin_unlock(&hba->device_lock);
1302
1303         se_release_vpd_for_dev(dev);
1304
1305         kfree(dev);
1306
1307         return NULL;
1308 }
1309 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1310
1311 /*      transport_generic_prepare_cdb():
1312  *
1313  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1314  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1315  *      The point of this is since we are mapping iSCSI LUNs to
1316  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1317  *      devices and HBAs for a loop.
1318  */
1319 static inline void transport_generic_prepare_cdb(
1320         unsigned char *cdb)
1321 {
1322         switch (cdb[0]) {
1323         case READ_10: /* SBC - RDProtect */
1324         case READ_12: /* SBC - RDProtect */
1325         case READ_16: /* SBC - RDProtect */
1326         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1327         case VERIFY: /* SBC - VRProtect */
1328         case VERIFY_16: /* SBC - VRProtect */
1329         case WRITE_VERIFY: /* SBC - VRProtect */
1330         case WRITE_VERIFY_12: /* SBC - VRProtect */
1331                 break;
1332         default:
1333                 cdb[1] &= 0x1f; /* clear logical unit number */
1334                 break;
1335         }
1336 }
1337
1338 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1339
1340 /*
1341  * Used by fabric modules containing a local struct se_cmd within their
1342  * fabric dependent per I/O descriptor.
1343  */
1344 void transport_init_se_cmd(
1345         struct se_cmd *cmd,
1346         struct target_core_fabric_ops *tfo,
1347         struct se_session *se_sess,
1348         u32 data_length,
1349         int data_direction,
1350         int task_attr,
1351         unsigned char *sense_buffer)
1352 {
1353         INIT_LIST_HEAD(&cmd->se_lun_node);
1354         INIT_LIST_HEAD(&cmd->se_delayed_node);
1355         INIT_LIST_HEAD(&cmd->se_qf_node);
1356         INIT_LIST_HEAD(&cmd->se_queue_node);
1357         INIT_LIST_HEAD(&cmd->se_cmd_list);
1358         INIT_LIST_HEAD(&cmd->execute_list);
1359         INIT_LIST_HEAD(&cmd->state_list);
1360         init_completion(&cmd->transport_lun_fe_stop_comp);
1361         init_completion(&cmd->transport_lun_stop_comp);
1362         init_completion(&cmd->t_transport_stop_comp);
1363         init_completion(&cmd->cmd_wait_comp);
1364         init_completion(&cmd->task_stop_comp);
1365         spin_lock_init(&cmd->t_state_lock);
1366         cmd->transport_state = CMD_T_DEV_ACTIVE;
1367
1368         cmd->se_tfo = tfo;
1369         cmd->se_sess = se_sess;
1370         cmd->data_length = data_length;
1371         cmd->data_direction = data_direction;
1372         cmd->sam_task_attr = task_attr;
1373         cmd->sense_buffer = sense_buffer;
1374
1375         cmd->state_active = false;
1376 }
1377 EXPORT_SYMBOL(transport_init_se_cmd);
1378
1379 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1380 {
1381         /*
1382          * Check if SAM Task Attribute emulation is enabled for this
1383          * struct se_device storage object
1384          */
1385         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1386                 return 0;
1387
1388         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1389                 pr_debug("SAM Task Attribute ACA"
1390                         " emulation is not supported\n");
1391                 return -EINVAL;
1392         }
1393         /*
1394          * Used to determine when ORDERED commands should go from
1395          * Dormant to Active status.
1396          */
1397         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1398         smp_mb__after_atomic_inc();
1399         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1400                         cmd->se_ordered_id, cmd->sam_task_attr,
1401                         cmd->se_dev->transport->name);
1402         return 0;
1403 }
1404
1405 /*      target_setup_cmd_from_cdb():
1406  *
1407  *      Called from fabric RX Thread.
1408  */
1409 int target_setup_cmd_from_cdb(
1410         struct se_cmd *cmd,
1411         unsigned char *cdb)
1412 {
1413         int ret;
1414
1415         transport_generic_prepare_cdb(cdb);
1416         /*
1417          * Ensure that the received CDB is less than the max (252 + 8) bytes
1418          * for VARIABLE_LENGTH_CMD
1419          */
1420         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1421                 pr_err("Received SCSI CDB with command_size: %d that"
1422                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1423                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1424                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1425                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1426                 return -EINVAL;
1427         }
1428         /*
1429          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1430          * allocate the additional extended CDB buffer now..  Otherwise
1431          * setup the pointer from __t_task_cdb to t_task_cdb.
1432          */
1433         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1434                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1435                                                 GFP_KERNEL);
1436                 if (!cmd->t_task_cdb) {
1437                         pr_err("Unable to allocate cmd->t_task_cdb"
1438                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1439                                 scsi_command_size(cdb),
1440                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1441                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1442                         cmd->scsi_sense_reason =
1443                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1444                         return -ENOMEM;
1445                 }
1446         } else
1447                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1448         /*
1449          * Copy the original CDB into cmd->
1450          */
1451         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1452         /*
1453          * Setup the received CDB based on SCSI defined opcodes and
1454          * perform unit attention, persistent reservations and ALUA
1455          * checks for virtual device backends.  The cmd->t_task_cdb
1456          * pointer is expected to be setup before we reach this point.
1457          */
1458         ret = transport_generic_cmd_sequencer(cmd, cdb);
1459         if (ret < 0)
1460                 return ret;
1461         /*
1462          * Check for SAM Task Attribute Emulation
1463          */
1464         if (transport_check_alloc_task_attr(cmd) < 0) {
1465                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1466                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1467                 return -EINVAL;
1468         }
1469         spin_lock(&cmd->se_lun->lun_sep_lock);
1470         if (cmd->se_lun->lun_sep)
1471                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1472         spin_unlock(&cmd->se_lun->lun_sep_lock);
1473         return 0;
1474 }
1475 EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1476
1477 /*
1478  * Used by fabric module frontends to queue tasks directly.
1479  * Many only be used from process context only
1480  */
1481 int transport_handle_cdb_direct(
1482         struct se_cmd *cmd)
1483 {
1484         int ret;
1485
1486         if (!cmd->se_lun) {
1487                 dump_stack();
1488                 pr_err("cmd->se_lun is NULL\n");
1489                 return -EINVAL;
1490         }
1491         if (in_interrupt()) {
1492                 dump_stack();
1493                 pr_err("transport_generic_handle_cdb cannot be called"
1494                                 " from interrupt context\n");
1495                 return -EINVAL;
1496         }
1497         /*
1498          * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
1499          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1500          * in existing usage to ensure that outstanding descriptors are handled
1501          * correctly during shutdown via transport_wait_for_tasks()
1502          *
1503          * Also, we don't take cmd->t_state_lock here as we only expect
1504          * this to be called for initial descriptor submission.
1505          */
1506         cmd->t_state = TRANSPORT_NEW_CMD;
1507         cmd->transport_state |= CMD_T_ACTIVE;
1508
1509         /*
1510          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1511          * so follow TRANSPORT_NEW_CMD processing thread context usage
1512          * and call transport_generic_request_failure() if necessary..
1513          */
1514         ret = transport_generic_new_cmd(cmd);
1515         if (ret < 0)
1516                 transport_generic_request_failure(cmd);
1517
1518         return 0;
1519 }
1520 EXPORT_SYMBOL(transport_handle_cdb_direct);
1521
1522 /**
1523  * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1524  *
1525  * @se_cmd: command descriptor to submit
1526  * @se_sess: associated se_sess for endpoint
1527  * @cdb: pointer to SCSI CDB
1528  * @sense: pointer to SCSI sense buffer
1529  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1530  * @data_length: fabric expected data transfer length
1531  * @task_addr: SAM task attribute
1532  * @data_dir: DMA data direction
1533  * @flags: flags for command submission from target_sc_flags_tables
1534  *
1535  * This may only be called from process context, and also currently
1536  * assumes internal allocation of fabric payload buffer by target-core.
1537  **/
1538 void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1539                 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1540                 u32 data_length, int task_attr, int data_dir, int flags)
1541 {
1542         struct se_portal_group *se_tpg;
1543         int rc;
1544
1545         se_tpg = se_sess->se_tpg;
1546         BUG_ON(!se_tpg);
1547         BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1548         BUG_ON(in_interrupt());
1549         /*
1550          * Initialize se_cmd for target operation.  From this point
1551          * exceptions are handled by sending exception status via
1552          * target_core_fabric_ops->queue_status() callback
1553          */
1554         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1555                                 data_length, data_dir, task_attr, sense);
1556         if (flags & TARGET_SCF_UNKNOWN_SIZE)
1557                 se_cmd->unknown_data_length = 1;
1558         /*
1559          * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1560          * se_sess->sess_cmd_list.  A second kref_get here is necessary
1561          * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1562          * kref_put() to happen during fabric packet acknowledgement.
1563          */
1564         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1565         /*
1566          * Signal bidirectional data payloads to target-core
1567          */
1568         if (flags & TARGET_SCF_BIDI_OP)
1569                 se_cmd->se_cmd_flags |= SCF_BIDI;
1570         /*
1571          * Locate se_lun pointer and attach it to struct se_cmd
1572          */
1573         if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1574                 transport_send_check_condition_and_sense(se_cmd,
1575                                 se_cmd->scsi_sense_reason, 0);
1576                 target_put_sess_cmd(se_sess, se_cmd);
1577                 return;
1578         }
1579         /*
1580          * Sanitize CDBs via transport_generic_cmd_sequencer() and
1581          * allocate the necessary tasks to complete the received CDB+data
1582          */
1583         rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1584         if (rc != 0) {
1585                 transport_generic_request_failure(se_cmd);
1586                 return;
1587         }
1588
1589         /*
1590          * Check if we need to delay processing because of ALUA
1591          * Active/NonOptimized primary access state..
1592          */
1593         core_alua_check_nonop_delay(se_cmd);
1594
1595         /*
1596          * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
1597          * for immediate execution of READs, otherwise wait for
1598          * transport_generic_handle_data() to be called for WRITEs
1599          * when fabric has filled the incoming buffer.
1600          */
1601         transport_handle_cdb_direct(se_cmd);
1602         return;
1603 }
1604 EXPORT_SYMBOL(target_submit_cmd);
1605
1606 static void target_complete_tmr_failure(struct work_struct *work)
1607 {
1608         struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1609
1610         se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1611         se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1612         transport_generic_free_cmd(se_cmd, 0);
1613 }
1614
1615 /**
1616  * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1617  *                     for TMR CDBs
1618  *
1619  * @se_cmd: command descriptor to submit
1620  * @se_sess: associated se_sess for endpoint
1621  * @sense: pointer to SCSI sense buffer
1622  * @unpacked_lun: unpacked LUN to reference for struct se_lun
1623  * @fabric_context: fabric context for TMR req
1624  * @tm_type: Type of TM request
1625  * @gfp: gfp type for caller
1626  * @tag: referenced task tag for TMR_ABORT_TASK
1627  * @flags: submit cmd flags
1628  *
1629  * Callable from all contexts.
1630  **/
1631
1632 int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1633                 unsigned char *sense, u32 unpacked_lun,
1634                 void *fabric_tmr_ptr, unsigned char tm_type,
1635                 gfp_t gfp, unsigned int tag, int flags)
1636 {
1637         struct se_portal_group *se_tpg;
1638         int ret;
1639
1640         se_tpg = se_sess->se_tpg;
1641         BUG_ON(!se_tpg);
1642
1643         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1644                               0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1645         /*
1646          * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1647          * allocation failure.
1648          */
1649         ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1650         if (ret < 0)
1651                 return -ENOMEM;
1652
1653         if (tm_type == TMR_ABORT_TASK)
1654                 se_cmd->se_tmr_req->ref_task_tag = tag;
1655
1656         /* See target_submit_cmd for commentary */
1657         target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1658
1659         ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1660         if (ret) {
1661                 /*
1662                  * For callback during failure handling, push this work off
1663                  * to process context with TMR_LUN_DOES_NOT_EXIST status.
1664                  */
1665                 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1666                 schedule_work(&se_cmd->work);
1667                 return 0;
1668         }
1669         transport_generic_handle_tmr(se_cmd);
1670         return 0;
1671 }
1672 EXPORT_SYMBOL(target_submit_tmr);
1673
1674 /*
1675  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1676  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1677  * complete setup in TCM process context w/ TFO->new_cmd_map().
1678  */
1679 int transport_generic_handle_cdb_map(
1680         struct se_cmd *cmd)
1681 {
1682         if (!cmd->se_lun) {
1683                 dump_stack();
1684                 pr_err("cmd->se_lun is NULL\n");
1685                 return -EINVAL;
1686         }
1687
1688         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1689         return 0;
1690 }
1691 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1692
1693 /*      transport_generic_handle_data():
1694  *
1695  *
1696  */
1697 int transport_generic_handle_data(
1698         struct se_cmd *cmd)
1699 {
1700         /*
1701          * For the software fabric case, then we assume the nexus is being
1702          * failed/shutdown when signals are pending from the kthread context
1703          * caller, so we return a failure.  For the HW target mode case running
1704          * in interrupt code, the signal_pending() check is skipped.
1705          */
1706         if (!in_interrupt() && signal_pending(current))
1707                 return -EPERM;
1708         /*
1709          * If the received CDB has aleady been ABORTED by the generic
1710          * target engine, we now call transport_check_aborted_status()
1711          * to queue any delated TASK_ABORTED status for the received CDB to the
1712          * fabric module as we are expecting no further incoming DATA OUT
1713          * sequences at this point.
1714          */
1715         if (transport_check_aborted_status(cmd, 1) != 0)
1716                 return 0;
1717
1718         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1719         return 0;
1720 }
1721 EXPORT_SYMBOL(transport_generic_handle_data);
1722
1723 /*      transport_generic_handle_tmr():
1724  *
1725  *
1726  */
1727 int transport_generic_handle_tmr(
1728         struct se_cmd *cmd)
1729 {
1730         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1731         return 0;
1732 }
1733 EXPORT_SYMBOL(transport_generic_handle_tmr);
1734
1735 /*
1736  * If the cmd is active, request it to be stopped and sleep until it
1737  * has completed.
1738  */
1739 bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1740 {
1741         bool was_active = false;
1742
1743         if (cmd->transport_state & CMD_T_BUSY) {
1744                 cmd->transport_state |= CMD_T_REQUEST_STOP;
1745                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1746
1747                 pr_debug("cmd %p waiting to complete\n", cmd);
1748                 wait_for_completion(&cmd->task_stop_comp);
1749                 pr_debug("cmd %p stopped successfully\n", cmd);
1750
1751                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1752                 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1753                 cmd->transport_state &= ~CMD_T_BUSY;
1754                 was_active = true;
1755         }
1756
1757         return was_active;
1758 }
1759
1760 /*
1761  * Handle SAM-esque emulation for generic transport request failures.
1762  */
1763 void transport_generic_request_failure(struct se_cmd *cmd)
1764 {
1765         int ret = 0;
1766
1767         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1768                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1769                 cmd->t_task_cdb[0]);
1770         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1771                 cmd->se_tfo->get_cmd_state(cmd),
1772                 cmd->t_state, cmd->scsi_sense_reason);
1773         pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1774                 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1775                 (cmd->transport_state & CMD_T_STOP) != 0,
1776                 (cmd->transport_state & CMD_T_SENT) != 0);
1777
1778         /*
1779          * For SAM Task Attribute emulation for failed struct se_cmd
1780          */
1781         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1782                 transport_complete_task_attr(cmd);
1783
1784         switch (cmd->scsi_sense_reason) {
1785         case TCM_NON_EXISTENT_LUN:
1786         case TCM_UNSUPPORTED_SCSI_OPCODE:
1787         case TCM_INVALID_CDB_FIELD:
1788         case TCM_INVALID_PARAMETER_LIST:
1789         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1790         case TCM_UNKNOWN_MODE_PAGE:
1791         case TCM_WRITE_PROTECTED:
1792         case TCM_CHECK_CONDITION_ABORT_CMD:
1793         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1794         case TCM_CHECK_CONDITION_NOT_READY:
1795                 break;
1796         case TCM_RESERVATION_CONFLICT:
1797                 /*
1798                  * No SENSE Data payload for this case, set SCSI Status
1799                  * and queue the response to $FABRIC_MOD.
1800                  *
1801                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1802                  */
1803                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1804                 /*
1805                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1806                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1807                  * CONFLICT STATUS.
1808                  *
1809                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1810                  */
1811                 if (cmd->se_sess &&
1812                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1813                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1814                                 cmd->orig_fe_lun, 0x2C,
1815                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1816
1817                 ret = cmd->se_tfo->queue_status(cmd);
1818                 if (ret == -EAGAIN || ret == -ENOMEM)
1819                         goto queue_full;
1820                 goto check_stop;
1821         default:
1822                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1823                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1824                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1825                 break;
1826         }
1827         /*
1828          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1829          * make the call to transport_send_check_condition_and_sense()
1830          * directly.  Otherwise expect the fabric to make the call to
1831          * transport_send_check_condition_and_sense() after handling
1832          * possible unsoliticied write data payloads.
1833          */
1834         ret = transport_send_check_condition_and_sense(cmd,
1835                         cmd->scsi_sense_reason, 0);
1836         if (ret == -EAGAIN || ret == -ENOMEM)
1837                 goto queue_full;
1838
1839 check_stop:
1840         transport_lun_remove_cmd(cmd);
1841         if (!transport_cmd_check_stop_to_fabric(cmd))
1842                 ;
1843         return;
1844
1845 queue_full:
1846         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1847         transport_handle_queue_full(cmd, cmd->se_dev);
1848 }
1849 EXPORT_SYMBOL(transport_generic_request_failure);
1850
1851 static inline u32 transport_lba_21(unsigned char *cdb)
1852 {
1853         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1854 }
1855
1856 static inline u32 transport_lba_32(unsigned char *cdb)
1857 {
1858         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1859 }
1860
1861 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1862 {
1863         unsigned int __v1, __v2;
1864
1865         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1866         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1867
1868         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1869 }
1870
1871 /*
1872  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1873  */
1874 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1875 {
1876         unsigned int __v1, __v2;
1877
1878         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1879         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1880
1881         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1882 }
1883
1884 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1885 {
1886         unsigned long flags;
1887
1888         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1889         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1890         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1891 }
1892
1893 /*
1894  * Called from Fabric Module context from transport_execute_tasks()
1895  *
1896  * The return of this function determins if the tasks from struct se_cmd
1897  * get added to the execution queue in transport_execute_tasks(),
1898  * or are added to the delayed or ordered lists here.
1899  */
1900 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1901 {
1902         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1903                 return 1;
1904         /*
1905          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1906          * to allow the passed struct se_cmd list of tasks to the front of the list.
1907          */
1908          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1909                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1910                         " 0x%02x, se_ordered_id: %u\n",
1911                         cmd->t_task_cdb[0],
1912                         cmd->se_ordered_id);
1913                 return 1;
1914         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1915                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1916                 smp_mb__after_atomic_inc();
1917
1918                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1919                                 " list, se_ordered_id: %u\n",
1920                                 cmd->t_task_cdb[0],
1921                                 cmd->se_ordered_id);
1922                 /*
1923                  * Add ORDERED command to tail of execution queue if
1924                  * no other older commands exist that need to be
1925                  * completed first.
1926                  */
1927                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1928                         return 1;
1929         } else {
1930                 /*
1931                  * For SIMPLE and UNTAGGED Task Attribute commands
1932                  */
1933                 atomic_inc(&cmd->se_dev->simple_cmds);
1934                 smp_mb__after_atomic_inc();
1935         }
1936         /*
1937          * Otherwise if one or more outstanding ORDERED task attribute exist,
1938          * add the dormant task(s) built for the passed struct se_cmd to the
1939          * execution queue and become in Active state for this struct se_device.
1940          */
1941         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1942                 /*
1943                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1944                  * will be drained upon completion of HEAD_OF_QUEUE task.
1945                  */
1946                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1947                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1948                 list_add_tail(&cmd->se_delayed_node,
1949                                 &cmd->se_dev->delayed_cmd_list);
1950                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1951
1952                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1953                         " delayed CMD list, se_ordered_id: %u\n",
1954                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1955                         cmd->se_ordered_id);
1956                 /*
1957                  * Return zero to let transport_execute_tasks() know
1958                  * not to add the delayed tasks to the execution list.
1959                  */
1960                 return 0;
1961         }
1962         /*
1963          * Otherwise, no ORDERED task attributes exist..
1964          */
1965         return 1;
1966 }
1967
1968 /*
1969  * Called from fabric module context in transport_generic_new_cmd() and
1970  * transport_generic_process_write()
1971  */
1972 static int transport_execute_tasks(struct se_cmd *cmd)
1973 {
1974         int add_tasks;
1975         struct se_device *se_dev = cmd->se_dev;
1976         /*
1977          * Call transport_cmd_check_stop() to see if a fabric exception
1978          * has occurred that prevents execution.
1979          */
1980         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
1981                 /*
1982                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
1983                  * attribute for the tasks of the received struct se_cmd CDB
1984                  */
1985                 add_tasks = transport_execute_task_attr(cmd);
1986                 if (!add_tasks)
1987                         goto execute_tasks;
1988
1989                 __transport_execute_tasks(se_dev, cmd);
1990                 return 0;
1991         }
1992
1993 execute_tasks:
1994         __transport_execute_tasks(se_dev, NULL);
1995         return 0;
1996 }
1997
1998 static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
1999 {
2000         int error;
2001         struct se_cmd *cmd = NULL;
2002         unsigned long flags;
2003
2004 check_depth:
2005         spin_lock_irq(&dev->execute_task_lock);
2006         if (new_cmd != NULL)
2007                 __target_add_to_execute_list(new_cmd);
2008
2009         if (list_empty(&dev->execute_list)) {
2010                 spin_unlock_irq(&dev->execute_task_lock);
2011                 return 0;
2012         }
2013         cmd = list_first_entry(&dev->execute_list, struct se_cmd, execute_list);
2014         __target_remove_from_execute_list(cmd);
2015         spin_unlock_irq(&dev->execute_task_lock);
2016
2017         spin_lock_irqsave(&cmd->t_state_lock, flags);
2018         cmd->transport_state |= CMD_T_BUSY;
2019         cmd->transport_state |= CMD_T_SENT;
2020
2021         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2022
2023         if (cmd->execute_cmd)
2024                 error = cmd->execute_cmd(cmd);
2025         else {
2026                 error = dev->transport->execute_cmd(cmd, cmd->t_data_sg,
2027                                 cmd->t_data_nents, cmd->data_direction);
2028         }
2029
2030         if (error != 0) {
2031                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2032                 cmd->transport_state &= ~CMD_T_BUSY;
2033                 cmd->transport_state &= ~CMD_T_SENT;
2034                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2035
2036                 transport_generic_request_failure(cmd);
2037         }
2038
2039         new_cmd = NULL;
2040         goto check_depth;
2041
2042         return 0;
2043 }
2044
2045 static inline u32 transport_get_sectors_6(
2046         unsigned char *cdb,
2047         struct se_cmd *cmd,
2048         int *ret)
2049 {
2050         struct se_device *dev = cmd->se_dev;
2051
2052         /*
2053          * Assume TYPE_DISK for non struct se_device objects.
2054          * Use 8-bit sector value.
2055          */
2056         if (!dev)
2057                 goto type_disk;
2058
2059         /*
2060          * Use 24-bit allocation length for TYPE_TAPE.
2061          */
2062         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2063                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2064
2065         /*
2066          * Everything else assume TYPE_DISK Sector CDB location.
2067          * Use 8-bit sector value.  SBC-3 says:
2068          *
2069          *   A TRANSFER LENGTH field set to zero specifies that 256
2070          *   logical blocks shall be written.  Any other value
2071          *   specifies the number of logical blocks that shall be
2072          *   written.
2073          */
2074 type_disk:
2075         return cdb[4] ? : 256;
2076 }
2077
2078 static inline u32 transport_get_sectors_10(
2079         unsigned char *cdb,
2080         struct se_cmd *cmd,
2081         int *ret)
2082 {
2083         struct se_device *dev = cmd->se_dev;
2084
2085         /*
2086          * Assume TYPE_DISK for non struct se_device objects.
2087          * Use 16-bit sector value.
2088          */
2089         if (!dev)
2090                 goto type_disk;
2091
2092         /*
2093          * XXX_10 is not defined in SSC, throw an exception
2094          */
2095         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2096                 *ret = -EINVAL;
2097                 return 0;
2098         }
2099
2100         /*
2101          * Everything else assume TYPE_DISK Sector CDB location.
2102          * Use 16-bit sector value.
2103          */
2104 type_disk:
2105         return (u32)(cdb[7] << 8) + cdb[8];
2106 }
2107
2108 static inline u32 transport_get_sectors_12(
2109         unsigned char *cdb,
2110         struct se_cmd *cmd,
2111         int *ret)
2112 {
2113         struct se_device *dev = cmd->se_dev;
2114
2115         /*
2116          * Assume TYPE_DISK for non struct se_device objects.
2117          * Use 32-bit sector value.
2118          */
2119         if (!dev)
2120                 goto type_disk;
2121
2122         /*
2123          * XXX_12 is not defined in SSC, throw an exception
2124          */
2125         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2126                 *ret = -EINVAL;
2127                 return 0;
2128         }
2129
2130         /*
2131          * Everything else assume TYPE_DISK Sector CDB location.
2132          * Use 32-bit sector value.
2133          */
2134 type_disk:
2135         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2136 }
2137
2138 static inline u32 transport_get_sectors_16(
2139         unsigned char *cdb,
2140         struct se_cmd *cmd,
2141         int *ret)
2142 {
2143         struct se_device *dev = cmd->se_dev;
2144
2145         /*
2146          * Assume TYPE_DISK for non struct se_device objects.
2147          * Use 32-bit sector value.
2148          */
2149         if (!dev)
2150                 goto type_disk;
2151
2152         /*
2153          * Use 24-bit allocation length for TYPE_TAPE.
2154          */
2155         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2156                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2157
2158 type_disk:
2159         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2160                     (cdb[12] << 8) + cdb[13];
2161 }
2162
2163 /*
2164  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2165  */
2166 static inline u32 transport_get_sectors_32(
2167         unsigned char *cdb,
2168         struct se_cmd *cmd,
2169         int *ret)
2170 {
2171         /*
2172          * Assume TYPE_DISK for non struct se_device objects.
2173          * Use 32-bit sector value.
2174          */
2175         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2176                     (cdb[30] << 8) + cdb[31];
2177
2178 }
2179
2180 static inline u32 transport_get_size(
2181         u32 sectors,
2182         unsigned char *cdb,
2183         struct se_cmd *cmd)
2184 {
2185         struct se_device *dev = cmd->se_dev;
2186
2187         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2188                 if (cdb[1] & 1) { /* sectors */
2189                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2190                 } else /* bytes */
2191                         return sectors;
2192         }
2193
2194         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2195                 " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size,
2196                 sectors, dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2197                 dev->transport->name);
2198
2199         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2200 }
2201
2202 static void transport_xor_callback(struct se_cmd *cmd)
2203 {
2204         unsigned char *buf, *addr;
2205         struct scatterlist *sg;
2206         unsigned int offset;
2207         int i;
2208         int count;
2209         /*
2210          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2211          *
2212          * 1) read the specified logical block(s);
2213          * 2) transfer logical blocks from the data-out buffer;
2214          * 3) XOR the logical blocks transferred from the data-out buffer with
2215          *    the logical blocks read, storing the resulting XOR data in a buffer;
2216          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2217          *    blocks transferred from the data-out buffer; and
2218          * 5) transfer the resulting XOR data to the data-in buffer.
2219          */
2220         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2221         if (!buf) {
2222                 pr_err("Unable to allocate xor_callback buf\n");
2223                 return;
2224         }
2225         /*
2226          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2227          * into the locally allocated *buf
2228          */
2229         sg_copy_to_buffer(cmd->t_data_sg,
2230                           cmd->t_data_nents,
2231                           buf,
2232                           cmd->data_length);
2233
2234         /*
2235          * Now perform the XOR against the BIDI read memory located at
2236          * cmd->t_mem_bidi_list
2237          */
2238
2239         offset = 0;
2240         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2241                 addr = kmap_atomic(sg_page(sg));
2242                 if (!addr)
2243                         goto out;
2244
2245                 for (i = 0; i < sg->length; i++)
2246                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2247
2248                 offset += sg->length;
2249                 kunmap_atomic(addr);
2250         }
2251
2252 out:
2253         kfree(buf);
2254 }
2255
2256 /*
2257  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2258  */
2259 static int transport_get_sense_data(struct se_cmd *cmd)
2260 {
2261         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2262         struct se_device *dev = cmd->se_dev;
2263         unsigned long flags;
2264         u32 offset = 0;
2265
2266         WARN_ON(!cmd->se_lun);
2267
2268         if (!dev)
2269                 return 0;
2270
2271         spin_lock_irqsave(&cmd->t_state_lock, flags);
2272         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2273                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2274                 return 0;
2275         }
2276
2277         if (!(cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2278                 goto out;
2279
2280         if (!dev->transport->get_sense_buffer) {
2281                 pr_err("dev->transport->get_sense_buffer is NULL\n");
2282                 goto out;
2283         }
2284
2285         sense_buffer = dev->transport->get_sense_buffer(cmd);
2286         if (!sense_buffer) {
2287                 pr_err("ITT 0x%08x cmd %p: Unable to locate"
2288                         " sense buffer for task with sense\n",
2289                         cmd->se_tfo->get_task_tag(cmd), cmd);
2290                 goto out;
2291         }
2292
2293         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2294
2295         offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);
2296
2297         memcpy(&buffer[offset], sense_buffer, TRANSPORT_SENSE_BUFFER);
2298
2299         /* Automatically padded */
2300         cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
2301
2302         pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x and sense\n",
2303                 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
2304         return 0;
2305
2306 out:
2307         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2308         return -1;
2309 }
2310
2311 static inline long long transport_dev_end_lba(struct se_device *dev)
2312 {
2313         return dev->transport->get_blocks(dev) + 1;
2314 }
2315
2316 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2317 {
2318         struct se_device *dev = cmd->se_dev;
2319         u32 sectors;
2320
2321         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2322                 return 0;
2323
2324         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2325
2326         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2327                 pr_err("LBA: %llu Sectors: %u exceeds"
2328                         " transport_dev_end_lba(): %llu\n",
2329                         cmd->t_task_lba, sectors,
2330                         transport_dev_end_lba(dev));
2331                 return -EINVAL;
2332         }
2333
2334         return 0;
2335 }
2336
2337 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2338 {
2339         /*
2340          * Determine if the received WRITE_SAME is used to for direct
2341          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2342          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2343          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2344          */
2345         int passthrough = (dev->transport->transport_type ==
2346                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2347
2348         if (!passthrough) {
2349                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2350                         pr_err("WRITE_SAME PBDATA and LBDATA"
2351                                 " bits not supported for Block Discard"
2352                                 " Emulation\n");
2353                         return -ENOSYS;
2354                 }
2355                 /*
2356                  * Currently for the emulated case we only accept
2357                  * tpws with the UNMAP=1 bit set.
2358                  */
2359                 if (!(flags[0] & 0x08)) {
2360                         pr_err("WRITE_SAME w/o UNMAP bit not"
2361                                 " supported for Block Discard Emulation\n");
2362                         return -ENOSYS;
2363                 }
2364         }
2365
2366         return 0;
2367 }
2368
2369 /*      transport_generic_cmd_sequencer():
2370  *
2371  *      Generic Command Sequencer that should work for most DAS transport
2372  *      drivers.
2373  *
2374  *      Called from target_setup_cmd_from_cdb() in the $FABRIC_MOD
2375  *      RX Thread.
2376  *
2377  *      FIXME: Need to support other SCSI OPCODES where as well.
2378  */
2379 static int transport_generic_cmd_sequencer(
2380         struct se_cmd *cmd,
2381         unsigned char *cdb)
2382 {
2383         struct se_device *dev = cmd->se_dev;
2384         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2385         int ret = 0, sector_ret = 0, passthrough;
2386         u32 sectors = 0, size = 0, pr_reg_type = 0;
2387         u16 service_action;
2388         u8 alua_ascq = 0;
2389         /*
2390          * Check for an existing UNIT ATTENTION condition
2391          */
2392         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2393                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2394                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2395                 return -EINVAL;
2396         }
2397         /*
2398          * Check status of Asymmetric Logical Unit Assignment port
2399          */
2400         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2401         if (ret != 0) {
2402                 /*
2403                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2404                  * The ALUA additional sense code qualifier (ASCQ) is determined
2405                  * by the ALUA primary or secondary access state..
2406                  */
2407                 if (ret > 0) {
2408                         pr_debug("[%s]: ALUA TG Port not available,"
2409                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2410                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2411
2412                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2413                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2414                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2415                         return -EINVAL;
2416                 }
2417                 goto out_invalid_cdb_field;
2418         }
2419         /*
2420          * Check status for SPC-3 Persistent Reservations
2421          */
2422         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2423                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2424                                         cmd, cdb, pr_reg_type) != 0) {
2425                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2426                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2427                         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2428                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2429                         return -EBUSY;
2430                 }
2431                 /*
2432                  * This means the CDB is allowed for the SCSI Initiator port
2433                  * when said port is *NOT* holding the legacy SPC-2 or
2434                  * SPC-3 Persistent Reservation.
2435                  */
2436         }
2437
2438         /*
2439          * If we operate in passthrough mode we skip most CDB emulation and
2440          * instead hand the commands down to the physical SCSI device.
2441          */
2442         passthrough =
2443                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2444
2445         switch (cdb[0]) {
2446         case READ_6:
2447                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2448                 if (sector_ret)
2449                         goto out_unsupported_cdb;
2450                 size = transport_get_size(sectors, cdb, cmd);
2451                 cmd->t_task_lba = transport_lba_21(cdb);
2452                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2453                 break;
2454         case READ_10:
2455                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2456                 if (sector_ret)
2457                         goto out_unsupported_cdb;
2458                 size = transport_get_size(sectors, cdb, cmd);
2459                 cmd->t_task_lba = transport_lba_32(cdb);
2460                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2461                 break;
2462         case READ_12:
2463                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2464                 if (sector_ret)
2465                         goto out_unsupported_cdb;
2466                 size = transport_get_size(sectors, cdb, cmd);
2467                 cmd->t_task_lba = transport_lba_32(cdb);
2468                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2469                 break;
2470         case READ_16:
2471                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2472                 if (sector_ret)
2473                         goto out_unsupported_cdb;
2474                 size = transport_get_size(sectors, cdb, cmd);
2475                 cmd->t_task_lba = transport_lba_64(cdb);
2476                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2477                 break;
2478         case WRITE_6:
2479                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2480                 if (sector_ret)
2481                         goto out_unsupported_cdb;
2482                 size = transport_get_size(sectors, cdb, cmd);
2483                 cmd->t_task_lba = transport_lba_21(cdb);
2484                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2485                 break;
2486         case WRITE_10:
2487                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2488                 if (sector_ret)
2489                         goto out_unsupported_cdb;
2490                 size = transport_get_size(sectors, cdb, cmd);
2491                 cmd->t_task_lba = transport_lba_32(cdb);
2492                 if (cdb[1] & 0x8)
2493                         cmd->se_cmd_flags |= SCF_FUA;
2494                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2495                 break;
2496         case WRITE_12:
2497                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2498                 if (sector_ret)
2499                         goto out_unsupported_cdb;
2500                 size = transport_get_size(sectors, cdb, cmd);
2501                 cmd->t_task_lba = transport_lba_32(cdb);
2502                 if (cdb[1] & 0x8)
2503                         cmd->se_cmd_flags |= SCF_FUA;
2504                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2505                 break;
2506         case WRITE_16:
2507                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2508                 if (sector_ret)
2509                         goto out_unsupported_cdb;
2510                 size = transport_get_size(sectors, cdb, cmd);
2511                 cmd->t_task_lba = transport_lba_64(cdb);
2512                 if (cdb[1] & 0x8)
2513                         cmd->se_cmd_flags |= SCF_FUA;
2514                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2515                 break;
2516         case XDWRITEREAD_10:
2517                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2518                     !(cmd->se_cmd_flags & SCF_BIDI))
2519                         goto out_invalid_cdb_field;
2520                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2521                 if (sector_ret)
2522                         goto out_unsupported_cdb;
2523                 size = transport_get_size(sectors, cdb, cmd);
2524                 cmd->t_task_lba = transport_lba_32(cdb);
2525                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2526
2527                 /*
2528                  * Do now allow BIDI commands for passthrough mode.
2529                  */
2530                 if (passthrough)
2531                         goto out_unsupported_cdb;
2532
2533                 /*
2534                  * Setup BIDI XOR callback to be run after I/O completion.
2535                  */
2536                 cmd->transport_complete_callback = &transport_xor_callback;
2537                 if (cdb[1] & 0x8)
2538                         cmd->se_cmd_flags |= SCF_FUA;
2539                 break;
2540         case VARIABLE_LENGTH_CMD:
2541                 service_action = get_unaligned_be16(&cdb[8]);
2542                 switch (service_action) {
2543                 case XDWRITEREAD_32:
2544                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2545                         if (sector_ret)
2546                                 goto out_unsupported_cdb;
2547                         size = transport_get_size(sectors, cdb, cmd);
2548                         /*
2549                          * Use WRITE_32 and READ_32 opcodes for the emulated
2550                          * XDWRITE_READ_32 logic.
2551                          */
2552                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2553                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2554
2555                         /*
2556                          * Do now allow BIDI commands for passthrough mode.
2557                          */
2558                         if (passthrough)
2559                                 goto out_unsupported_cdb;
2560
2561                         /*
2562                          * Setup BIDI XOR callback to be run during after I/O
2563                          * completion.
2564                          */
2565                         cmd->transport_complete_callback = &transport_xor_callback;
2566                         if (cdb[1] & 0x8)
2567                                 cmd->se_cmd_flags |= SCF_FUA;
2568                         break;
2569                 case WRITE_SAME_32:
2570                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2571                         if (sector_ret)
2572                                 goto out_unsupported_cdb;
2573
2574                         if (sectors)
2575                                 size = transport_get_size(1, cdb, cmd);
2576                         else {
2577                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2578                                        " supported\n");
2579                                 goto out_invalid_cdb_field;
2580                         }
2581
2582                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2583                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2584
2585                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2586                                 goto out_unsupported_cdb;
2587                         if (!passthrough)
2588                                 cmd->execute_cmd = target_emulate_write_same;
2589                         break;
2590                 default:
2591                         pr_err("VARIABLE_LENGTH_CMD service action"
2592                                 " 0x%04x not supported\n", service_action);
2593                         goto out_unsupported_cdb;
2594                 }
2595                 break;
2596         case MAINTENANCE_IN:
2597                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2598                         /* MAINTENANCE_IN from SCC-2 */
2599                         /*
2600                          * Check for emulated MI_REPORT_TARGET_PGS.
2601                          */
2602                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2603                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2604                                 cmd->execute_cmd =
2605                                         target_emulate_report_target_port_groups;
2606                         }
2607                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2608                                (cdb[8] << 8) | cdb[9];
2609                 } else {
2610                         /* GPCMD_SEND_KEY from multi media commands */
2611                         size = (cdb[8] << 8) + cdb[9];
2612                 }
2613                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2614                 break;
2615         case MODE_SELECT:
2616                 size = cdb[4];
2617                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2618                 break;
2619         case MODE_SELECT_10:
2620                 size = (cdb[7] << 8) + cdb[8];
2621                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2622                 break;
2623         case MODE_SENSE:
2624                 size = cdb[4];
2625                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2626                 if (!passthrough)
2627                         cmd->execute_cmd = target_emulate_modesense;
2628                 break;
2629         case MODE_SENSE_10:
2630                 size = (cdb[7] << 8) + cdb[8];
2631                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2632                 if (!passthrough)
2633                         cmd->execute_cmd = target_emulate_modesense;
2634                 break;
2635         case GPCMD_READ_BUFFER_CAPACITY:
2636         case GPCMD_SEND_OPC:
2637         case LOG_SELECT:
2638         case LOG_SENSE:
2639                 size = (cdb[7] << 8) + cdb[8];
2640                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2641                 break;
2642         case READ_BLOCK_LIMITS:
2643                 size = READ_BLOCK_LEN;
2644                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2645                 break;
2646         case GPCMD_GET_CONFIGURATION:
2647         case GPCMD_READ_FORMAT_CAPACITIES:
2648         case GPCMD_READ_DISC_INFO:
2649         case GPCMD_READ_TRACK_RZONE_INFO:
2650                 size = (cdb[7] << 8) + cdb[8];
2651                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2652                 break;
2653         case PERSISTENT_RESERVE_IN:
2654                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2655                         cmd->execute_cmd = target_scsi3_emulate_pr_in;
2656                 size = (cdb[7] << 8) + cdb[8];
2657                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2658                 break;
2659         case PERSISTENT_RESERVE_OUT:
2660                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2661                         cmd->execute_cmd = target_scsi3_emulate_pr_out;
2662                 size = (cdb[7] << 8) + cdb[8];
2663                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2664                 break;
2665         case GPCMD_MECHANISM_STATUS:
2666         case GPCMD_READ_DVD_STRUCTURE:
2667                 size = (cdb[8] << 8) + cdb[9];
2668                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2669                 break;
2670         case READ_POSITION:
2671                 size = READ_POSITION_LEN;
2672                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2673                 break;
2674         case MAINTENANCE_OUT:
2675                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2676                         /* MAINTENANCE_OUT from SCC-2
2677                          *
2678                          * Check for emulated MO_SET_TARGET_PGS.
2679                          */
2680                         if (cdb[1] == MO_SET_TARGET_PGS &&
2681                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2682                                 cmd->execute_cmd =
2683                                         target_emulate_set_target_port_groups;
2684                         }
2685
2686                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2687                                (cdb[8] << 8) | cdb[9];
2688                 } else  {
2689                         /* GPCMD_REPORT_KEY from multi media commands */
2690                         size = (cdb[8] << 8) + cdb[9];
2691                 }
2692                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2693                 break;
2694         case INQUIRY:
2695                 size = (cdb[3] << 8) + cdb[4];
2696                 /*
2697                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2698                  * See spc4r17 section 5.3
2699                  */
2700                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2701                         cmd->sam_task_attr = MSG_HEAD_TAG;
2702                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2703                 if (!passthrough)
2704                         cmd->execute_cmd = target_emulate_inquiry;
2705                 break;
2706         case READ_BUFFER:
2707                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2708                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2709                 break;
2710         case READ_CAPACITY:
2711                 size = READ_CAP_LEN;
2712                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2713                 if (!passthrough)
2714                         cmd->execute_cmd = target_emulate_readcapacity;
2715                 break;
2716         case READ_MEDIA_SERIAL_NUMBER:
2717         case SECURITY_PROTOCOL_IN:
2718         case SECURITY_PROTOCOL_OUT:
2719                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2720                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2721                 break;
2722         case SERVICE_ACTION_IN:
2723                 switch (cmd->t_task_cdb[1] & 0x1f) {
2724                 case SAI_READ_CAPACITY_16:
2725                         if (!passthrough)
2726                                 cmd->execute_cmd =
2727                                         target_emulate_readcapacity_16;
2728                         break;
2729                 default:
2730                         if (passthrough)
2731                                 break;
2732
2733                         pr_err("Unsupported SA: 0x%02x\n",
2734                                 cmd->t_task_cdb[1] & 0x1f);
2735                         goto out_invalid_cdb_field;
2736                 }
2737                 /*FALLTHROUGH*/
2738         case ACCESS_CONTROL_IN:
2739         case ACCESS_CONTROL_OUT:
2740         case EXTENDED_COPY:
2741         case READ_ATTRIBUTE:
2742         case RECEIVE_COPY_RESULTS:
2743         case WRITE_ATTRIBUTE:
2744                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2745                        (cdb[12] << 8) | cdb[13];
2746                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2747                 break;
2748         case RECEIVE_DIAGNOSTIC:
2749         case SEND_DIAGNOSTIC:
2750                 size = (cdb[3] << 8) | cdb[4];
2751                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2752                 break;
2753 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2754 #if 0
2755         case GPCMD_READ_CD:
2756                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2757                 size = (2336 * sectors);
2758                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2759                 break;
2760 #endif
2761         case READ_TOC:
2762                 size = cdb[8];
2763                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2764                 break;
2765         case REQUEST_SENSE:
2766                 size = cdb[4];
2767                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2768                 if (!passthrough)
2769                         cmd->execute_cmd = target_emulate_request_sense;
2770                 break;
2771         case READ_ELEMENT_STATUS:
2772                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2773                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2774                 break;
2775         case WRITE_BUFFER:
2776                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2777                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2778                 break;
2779         case RESERVE:
2780         case RESERVE_10:
2781                 /*
2782                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2783                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2784                  */
2785                 if (cdb[0] == RESERVE_10)
2786                         size = (cdb[7] << 8) | cdb[8];
2787                 else
2788                         size = cmd->data_length;
2789
2790                 /*
2791                  * Setup the legacy emulated handler for SPC-2 and
2792                  * >= SPC-3 compatible reservation handling (CRH=1)
2793                  * Otherwise, we assume the underlying SCSI logic is
2794                  * is running in SPC_PASSTHROUGH, and wants reservations
2795                  * emulation disabled.
2796                  */
2797                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2798                         cmd->execute_cmd = target_scsi2_reservation_reserve;
2799                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2800                 break;
2801         case RELEASE:
2802         case RELEASE_10:
2803                 /*
2804                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2805                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2806                 */
2807                 if (cdb[0] == RELEASE_10)
2808                         size = (cdb[7] << 8) | cdb[8];
2809                 else
2810                         size = cmd->data_length;
2811
2812                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2813                         cmd->execute_cmd = target_scsi2_reservation_release;
2814                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2815                 break;
2816         case SYNCHRONIZE_CACHE:
2817         case SYNCHRONIZE_CACHE_16:
2818                 /*
2819                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2820                  */
2821                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2822                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2823                         cmd->t_task_lba = transport_lba_32(cdb);
2824                 } else {
2825                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2826                         cmd->t_task_lba = transport_lba_64(cdb);
2827                 }
2828                 if (sector_ret)
2829                         goto out_unsupported_cdb;
2830
2831                 size = transport_get_size(sectors, cdb, cmd);
2832                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2833
2834                 if (passthrough)
2835                         break;
2836
2837                 /*
2838                  * Check to ensure that LBA + Range does not exceed past end of
2839                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2840                  */
2841                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2842                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2843                                 goto out_invalid_cdb_field;
2844                 }
2845                 cmd->execute_cmd = target_emulate_synchronize_cache;
2846                 break;
2847         case UNMAP:
2848                 size = get_unaligned_be16(&cdb[7]);
2849                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2850                 if (!passthrough)
2851                         cmd->execute_cmd = target_emulate_unmap;
2852                 break;
2853         case WRITE_SAME_16:
2854                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2855                 if (sector_ret)
2856                         goto out_unsupported_cdb;
2857
2858                 if (sectors)
2859                         size = transport_get_size(1, cdb, cmd);
2860                 else {
2861                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2862                         goto out_invalid_cdb_field;
2863                 }
2864
2865                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2866                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2867
2868                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2869                         goto out_unsupported_cdb;
2870                 if (!passthrough)
2871                         cmd->execute_cmd = target_emulate_write_same;
2872                 break;
2873         case WRITE_SAME:
2874                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2875                 if (sector_ret)
2876                         goto out_unsupported_cdb;
2877
2878                 if (sectors)
2879                         size = transport_get_size(1, cdb, cmd);
2880                 else {
2881                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2882                         goto out_invalid_cdb_field;
2883                 }
2884
2885                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2886                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2887                 /*
2888                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2889                  * of byte 1 bit 3 UNMAP instead of original reserved field
2890                  */
2891                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2892                         goto out_unsupported_cdb;
2893                 if (!passthrough)
2894                         cmd->execute_cmd = target_emulate_write_same;
2895                 break;
2896         case ALLOW_MEDIUM_REMOVAL:
2897         case ERASE:
2898         case REZERO_UNIT:
2899         case SEEK_10:
2900         case SPACE:
2901         case START_STOP:
2902         case TEST_UNIT_READY:
2903         case VERIFY:
2904         case WRITE_FILEMARKS:
2905                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2906                 if (!passthrough)
2907                         cmd->execute_cmd = target_emulate_noop;
2908                 break;
2909         case GPCMD_CLOSE_TRACK:
2910         case INITIALIZE_ELEMENT_STATUS:
2911         case GPCMD_LOAD_UNLOAD:
2912         case GPCMD_SET_SPEED:
2913         case MOVE_MEDIUM:
2914                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2915                 break;
2916         case REPORT_LUNS:
2917                 cmd->execute_cmd = target_report_luns;
2918                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2919                 /*
2920                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
2921                  * See spc4r17 section 5.3
2922                  */
2923                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2924                         cmd->sam_task_attr = MSG_HEAD_TAG;
2925                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2926                 break;
2927         case GET_EVENT_STATUS_NOTIFICATION:
2928                 size = (cdb[7] << 8) | cdb[8];
2929                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2930                 break;
2931         default:
2932                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
2933                         " 0x%02x, sending CHECK_CONDITION.\n",
2934                         cmd->se_tfo->get_fabric_name(), cdb[0]);
2935                 goto out_unsupported_cdb;
2936         }
2937
2938         if (cmd->unknown_data_length)
2939                 cmd->data_length = size;
2940
2941         if (size != cmd->data_length) {
2942                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
2943                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
2944                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
2945                                 cmd->data_length, size, cdb[0]);
2946
2947                 cmd->cmd_spdtl = size;
2948
2949                 if (cmd->data_direction == DMA_TO_DEVICE) {
2950                         pr_err("Rejecting underflow/overflow"
2951                                         " WRITE data\n");
2952                         goto out_invalid_cdb_field;
2953                 }
2954                 /*
2955                  * Reject READ_* or WRITE_* with overflow/underflow for
2956                  * type SCF_SCSI_DATA_SG_IO_CDB.
2957                  */
2958                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
2959                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
2960                                 " CDB on non 512-byte sector setup subsystem"
2961                                 " plugin: %s\n", dev->transport->name);
2962                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
2963                         goto out_invalid_cdb_field;
2964                 }
2965
2966                 if (size > cmd->data_length) {
2967                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
2968                         cmd->residual_count = (size - cmd->data_length);
2969                 } else {
2970                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
2971                         cmd->residual_count = (cmd->data_length - size);
2972                 }
2973                 cmd->data_length = size;
2974         }
2975
2976         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
2977                 if (sectors > su_dev->se_dev_attrib.fabric_max_sectors) {
2978                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2979                                 " big sectors %u exceeds fabric_max_sectors:"
2980                                 " %u\n", cdb[0], sectors,
2981                                 su_dev->se_dev_attrib.fabric_max_sectors);
2982                         goto out_invalid_cdb_field;
2983                 }
2984                 if (sectors > su_dev->se_dev_attrib.hw_max_sectors) {
2985                         printk_ratelimited(KERN_ERR "SCSI OP %02xh with too"
2986                                 " big sectors %u exceeds backend hw_max_sectors:"
2987                                 " %u\n", cdb[0], sectors,
2988                                 su_dev->se_dev_attrib.hw_max_sectors);
2989                         goto out_invalid_cdb_field;
2990                 }
2991         }
2992
2993         /* reject any command that we don't have a handler for */
2994         if (!(passthrough || cmd->execute_cmd ||
2995              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2996                 goto out_unsupported_cdb;
2997
2998         transport_set_supported_SAM_opcode(cmd);
2999         return ret;
3000
3001 out_unsupported_cdb:
3002         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3003         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3004         return -EINVAL;
3005 out_invalid_cdb_field:
3006         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3007         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3008         return -EINVAL;
3009 }
3010
3011 /*
3012  * Called from I/O completion to determine which dormant/delayed
3013  * and ordered cmds need to have their tasks added to the execution queue.
3014  */
3015 static void transport_complete_task_attr(struct se_cmd *cmd)
3016 {
3017         struct se_device *dev = cmd->se_dev;
3018         struct se_cmd *cmd_p, *cmd_tmp;
3019         int new_active_tasks = 0;
3020
3021         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3022                 atomic_dec(&dev->simple_cmds);
3023                 smp_mb__after_atomic_dec();
3024                 dev->dev_cur_ordered_id++;
3025                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3026                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3027                         cmd->se_ordered_id);
3028         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3029                 dev->dev_cur_ordered_id++;
3030                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3031                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3032                         cmd->se_ordered_id);
3033         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3034                 atomic_dec(&dev->dev_ordered_sync);
3035                 smp_mb__after_atomic_dec();
3036
3037                 dev->dev_cur_ordered_id++;
3038                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3039                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3040         }
3041         /*
3042          * Process all commands up to the last received
3043          * ORDERED task attribute which requires another blocking
3044          * boundary
3045          */
3046         spin_lock(&dev->delayed_cmd_lock);
3047         list_for_each_entry_safe(cmd_p, cmd_tmp,
3048                         &dev->delayed_cmd_list, se_delayed_node) {
3049
3050                 list_del(&cmd_p->se_delayed_node);
3051                 spin_unlock(&dev->delayed_cmd_lock);
3052
3053                 pr_debug("Calling add_tasks() for"
3054                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3055                         " Dormant -> Active, se_ordered_id: %u\n",
3056                         cmd_p->t_task_cdb[0],
3057                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3058
3059                 target_add_to_execute_list(cmd_p);
3060                 new_active_tasks++;
3061
3062                 spin_lock(&dev->delayed_cmd_lock);
3063                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3064                         break;
3065         }
3066         spin_unlock(&dev->delayed_cmd_lock);
3067         /*
3068          * If new tasks have become active, wake up the transport thread
3069          * to do the processing of the Active tasks.
3070          */
3071         if (new_active_tasks != 0)
3072                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3073 }
3074
3075 static void transport_complete_qf(struct se_cmd *cmd)
3076 {
3077         int ret = 0;
3078
3079         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3080                 transport_complete_task_attr(cmd);
3081
3082         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3083                 ret = cmd->se_tfo->queue_status(cmd);
3084                 if (ret)
3085                         goto out;
3086         }
3087
3088         switch (cmd->data_direction) {
3089         case DMA_FROM_DEVICE:
3090                 ret = cmd->se_tfo->queue_data_in(cmd);
3091                 break;
3092         case DMA_TO_DEVICE:
3093                 if (cmd->t_bidi_data_sg) {
3094                         ret = cmd->se_tfo->queue_data_in(cmd);
3095                         if (ret < 0)
3096                                 break;
3097                 }
3098                 /* Fall through for DMA_TO_DEVICE */
3099         case DMA_NONE:
3100                 ret = cmd->se_tfo->queue_status(cmd);
3101                 break;
3102         default:
3103                 break;
3104         }
3105
3106 out:
3107         if (ret < 0) {
3108                 transport_handle_queue_full(cmd, cmd->se_dev);
3109                 return;
3110         }
3111         transport_lun_remove_cmd(cmd);
3112         transport_cmd_check_stop_to_fabric(cmd);
3113 }
3114
3115 static void transport_handle_queue_full(
3116         struct se_cmd *cmd,
3117         struct se_device *dev)
3118 {
3119         spin_lock_irq(&dev->qf_cmd_lock);
3120         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3121         atomic_inc(&dev->dev_qf_count);
3122         smp_mb__after_atomic_inc();
3123         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3124
3125         schedule_work(&cmd->se_dev->qf_work_queue);
3126 }
3127
3128 static void target_complete_ok_work(struct work_struct *work)
3129 {
3130         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3131         int reason = 0, ret;
3132
3133         /*
3134          * Check if we need to move delayed/dormant tasks from cmds on the
3135          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3136          * Attribute.
3137          */
3138         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3139                 transport_complete_task_attr(cmd);
3140         /*
3141          * Check to schedule QUEUE_FULL work, or execute an existing
3142          * cmd->transport_qf_callback()
3143          */
3144         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3145                 schedule_work(&cmd->se_dev->qf_work_queue);
3146
3147         /*
3148          * Check if we need to retrieve a sense buffer from
3149          * the struct se_cmd in question.
3150          */
3151         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3152                 if (transport_get_sense_data(cmd) < 0)
3153                         reason = TCM_NON_EXISTENT_LUN;
3154
3155                 if (cmd->scsi_status) {
3156                         ret = transport_send_check_condition_and_sense(
3157                                         cmd, reason, 1);
3158                         if (ret == -EAGAIN || ret == -ENOMEM)
3159                                 goto queue_full;
3160
3161                         transport_lun_remove_cmd(cmd);
3162                         transport_cmd_check_stop_to_fabric(cmd);
3163                         return;
3164                 }
3165         }
3166         /*
3167          * Check for a callback, used by amongst other things
3168          * XDWRITE_READ_10 emulation.
3169          */
3170         if (cmd->transport_complete_callback)
3171                 cmd->transport_complete_callback(cmd);
3172
3173         switch (cmd->data_direction) {
3174         case DMA_FROM_DEVICE:
3175                 spin_lock(&cmd->se_lun->lun_sep_lock);
3176                 if (cmd->se_lun->lun_sep) {
3177                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3178                                         cmd->data_length;
3179                 }
3180                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3181
3182                 ret = cmd->se_tfo->queue_data_in(cmd);
3183                 if (ret == -EAGAIN || ret == -ENOMEM)
3184                         goto queue_full;
3185                 break;
3186         case DMA_TO_DEVICE:
3187                 spin_lock(&cmd->se_lun->lun_sep_lock);
3188                 if (cmd->se_lun->lun_sep) {
3189                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3190                                 cmd->data_length;
3191                 }
3192                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3193                 /*
3194                  * Check if we need to send READ payload for BIDI-COMMAND
3195                  */
3196                 if (cmd->t_bidi_data_sg) {
3197                         spin_lock(&cmd->se_lun->lun_sep_lock);
3198                         if (cmd->se_lun->lun_sep) {
3199                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3200                                         cmd->data_length;
3201                         }
3202                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3203                         ret = cmd->se_tfo->queue_data_in(cmd);
3204                         if (ret == -EAGAIN || ret == -ENOMEM)
3205                                 goto queue_full;
3206                         break;
3207                 }
3208                 /* Fall through for DMA_TO_DEVICE */
3209         case DMA_NONE:
3210                 ret = cmd->se_tfo->queue_status(cmd);
3211                 if (ret == -EAGAIN || ret == -ENOMEM)
3212                         goto queue_full;
3213                 break;
3214         default:
3215                 break;
3216         }
3217
3218         transport_lun_remove_cmd(cmd);
3219         transport_cmd_check_stop_to_fabric(cmd);
3220         return;
3221
3222 queue_full:
3223         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3224                 " data_direction: %d\n", cmd, cmd->data_direction);
3225         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3226         transport_handle_queue_full(cmd, cmd->se_dev);
3227 }
3228
3229 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3230 {
3231         struct scatterlist *sg;
3232         int count;
3233
3234         for_each_sg(sgl, sg, nents, count)
3235                 __free_page(sg_page(sg));
3236
3237         kfree(sgl);
3238 }
3239
3240 static inline void transport_free_pages(struct se_cmd *cmd)
3241 {
3242         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3243                 return;
3244
3245         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3246         cmd->t_data_sg = NULL;
3247         cmd->t_data_nents = 0;
3248
3249         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3250         cmd->t_bidi_data_sg = NULL;
3251         cmd->t_bidi_data_nents = 0;
3252 }
3253
3254 /**
3255  * transport_release_cmd - free a command
3256  * @cmd:       command to free
3257  *
3258  * This routine unconditionally frees a command, and reference counting
3259  * or list removal must be done in the caller.
3260  */
3261 static void transport_release_cmd(struct se_cmd *cmd)
3262 {
3263         BUG_ON(!cmd->se_tfo);
3264
3265         if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
3266                 core_tmr_release_req(cmd->se_tmr_req);
3267         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3268                 kfree(cmd->t_task_cdb);
3269         /*
3270          * If this cmd has been setup with target_get_sess_cmd(), drop
3271          * the kref and call ->release_cmd() in kref callback.
3272          */
3273          if (cmd->check_release != 0) {
3274                 target_put_sess_cmd(cmd->se_sess, cmd);
3275                 return;
3276         }
3277         cmd->se_tfo->release_cmd(cmd);
3278 }
3279
3280 /**
3281  * transport_put_cmd - release a reference to a command
3282  * @cmd:       command to release
3283  *
3284  * This routine releases our reference to the command and frees it if possible.
3285  */
3286 static void transport_put_cmd(struct se_cmd *cmd)
3287 {
3288         unsigned long flags;
3289
3290         spin_lock_irqsave(&cmd->t_state_lock, flags);
3291         if (atomic_read(&cmd->t_fe_count)) {
3292                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3293                         goto out_busy;
3294         }
3295
3296         if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
3297                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3298                 target_remove_from_state_list(cmd);
3299         }
3300         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3301
3302         transport_free_pages(cmd);
3303         transport_release_cmd(cmd);
3304         return;
3305 out_busy:
3306         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3307 }
3308
3309 /*
3310  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3311  * allocating in the core.
3312  * @cmd:  Associated se_cmd descriptor
3313  * @mem:  SGL style memory for TCM WRITE / READ
3314  * @sg_mem_num: Number of SGL elements
3315  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3316  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3317  *
3318  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3319  * of parameters.
3320  */
3321 int transport_generic_map_mem_to_cmd(
3322         struct se_cmd *cmd,
3323         struct scatterlist *sgl,
3324         u32 sgl_count,
3325         struct scatterlist *sgl_bidi,
3326         u32 sgl_bidi_count)
3327 {
3328         if (!sgl || !sgl_count)
3329                 return 0;
3330
3331         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3332             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3333                 /*
3334                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3335                  * scatterlists already have been set to follow what the fabric
3336                  * passes for the original expected data transfer length.
3337                  */
3338                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3339                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3340                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3341                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3342                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3343                         return -EINVAL;
3344                 }
3345
3346                 cmd->t_data_sg = sgl;
3347                 cmd->t_data_nents = sgl_count;
3348
3349                 if (sgl_bidi && sgl_bidi_count) {
3350                         cmd->t_bidi_data_sg = sgl_bidi;
3351                         cmd->t_bidi_data_nents = sgl_bidi_count;
3352                 }
3353                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3354         }
3355
3356         return 0;
3357 }
3358 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3359
3360 void *transport_kmap_data_sg(struct se_cmd *cmd)
3361 {
3362         struct scatterlist *sg = cmd->t_data_sg;
3363         struct page **pages;
3364         int i;
3365
3366         BUG_ON(!sg);
3367         /*
3368          * We need to take into account a possible offset here for fabrics like
3369          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3370          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3371          */
3372         if (!cmd->t_data_nents)
3373                 return NULL;
3374         else if (cmd->t_data_nents == 1)
3375                 return kmap(sg_page(sg)) + sg->offset;
3376
3377         /* >1 page. use vmap */
3378         pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
3379         if (!pages)
3380                 return NULL;
3381
3382         /* convert sg[] to pages[] */
3383         for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
3384                 pages[i] = sg_page(sg);
3385         }
3386
3387         cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
3388         kfree(pages);
3389         if (!cmd->t_data_vmap)
3390                 return NULL;
3391
3392         return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
3393 }
3394 EXPORT_SYMBOL(transport_kmap_data_sg);
3395
3396 void transport_kunmap_data_sg(struct se_cmd *cmd)
3397 {
3398         if (!cmd->t_data_nents) {
3399                 return;
3400         } else if (cmd->t_data_nents == 1) {
3401                 kunmap(sg_page(cmd->t_data_sg));
3402                 return;
3403         }
3404
3405         vunmap(cmd->t_data_vmap);
3406         cmd->t_data_vmap = NULL;
3407 }
3408 EXPORT_SYMBOL(transport_kunmap_data_sg);
3409
3410 static int
3411 transport_generic_get_mem(struct se_cmd *cmd)
3412 {
3413         u32 length = cmd->data_length;
3414         unsigned int nents;
3415         struct page *page;
3416         gfp_t zero_flag;
3417         int i = 0;
3418
3419         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3420         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3421         if (!cmd->t_data_sg)
3422                 return -ENOMEM;
3423
3424         cmd->t_data_nents = nents;
3425         sg_init_table(cmd->t_data_sg, nents);
3426
3427         zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
3428
3429         while (length) {
3430                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3431                 page = alloc_page(GFP_KERNEL | zero_flag);
3432                 if (!page)
3433                         goto out;
3434
3435                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3436                 length -= page_len;
3437                 i++;
3438         }
3439         return 0;
3440
3441 out:
3442         while (i >= 0) {
3443                 __free_page(sg_page(&cmd->t_data_sg[i]));
3444                 i--;
3445         }
3446         kfree(cmd->t_data_sg);
3447         cmd->t_data_sg = NULL;
3448         return -ENOMEM;
3449 }
3450
3451 /*
3452  * Allocate any required resources to execute the command.  For writes we
3453  * might not have the payload yet, so notify the fabric via a call to
3454  * ->write_pending instead. Otherwise place it on the execution queue.
3455  */
3456 int transport_generic_new_cmd(struct se_cmd *cmd)
3457 {
3458         struct se_device *dev = cmd->se_dev;
3459         int ret = 0;
3460
3461         /*
3462          * Determine is the TCM fabric module has already allocated physical
3463          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3464          * beforehand.
3465          */
3466         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3467             cmd->data_length) {
3468                 ret = transport_generic_get_mem(cmd);
3469                 if (ret < 0)
3470                         goto out_fail;
3471         }
3472
3473         /* Workaround for handling zero-length control CDBs */
3474         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3475             !cmd->data_length) {
3476                 spin_lock_irq(&cmd->t_state_lock);
3477                 cmd->t_state = TRANSPORT_COMPLETE;
3478                 cmd->transport_state |= CMD_T_ACTIVE;
3479                 spin_unlock_irq(&cmd->t_state_lock);
3480
3481                 if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
3482                         u8 ua_asc = 0, ua_ascq = 0;
3483
3484                         core_scsi3_ua_clear_for_request_sense(cmd,
3485                                         &ua_asc, &ua_ascq);
3486                 }
3487
3488                 INIT_WORK(&cmd->work, target_complete_ok_work);
3489                 queue_work(target_completion_wq, &cmd->work);
3490                 return 0;
3491         }
3492
3493         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3494                 struct se_dev_attrib *attr = &dev->se_sub_dev->se_dev_attrib;
3495
3496                 if (transport_cmd_get_valid_sectors(cmd) < 0)
3497                         return -EINVAL;
3498
3499                 BUG_ON(cmd->data_length % attr->block_size);
3500                 BUG_ON(DIV_ROUND_UP(cmd->data_length, attr->block_size) >
3501                         attr->max_sectors);
3502         }
3503
3504         atomic_inc(&cmd->t_fe_count);
3505
3506         /*
3507          * For WRITEs, let the fabric know its buffer is ready.
3508          *
3509          * The command will be added to the execution queue after its write
3510          * data has arrived.
3511          */
3512         if (cmd->data_direction == DMA_TO_DEVICE) {
3513                 target_add_to_state_list(cmd);
3514                 return transport_generic_write_pending(cmd);
3515         }
3516         /*
3517          * Everything else but a WRITE, add the command to the execution queue.
3518          */
3519         transport_execute_tasks(cmd);
3520         return 0;
3521
3522 out_fail:
3523         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3524         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3525         return -EINVAL;
3526 }
3527 EXPORT_SYMBOL(transport_generic_new_cmd);
3528
3529 /*      transport_generic_process_write():
3530  *
3531  *
3532  */
3533 void transport_generic_process_write(struct se_cmd *cmd)
3534 {
3535         transport_execute_tasks(cmd);
3536 }
3537 EXPORT_SYMBOL(transport_generic_process_write);
3538
3539 static void transport_write_pending_qf(struct se_cmd *cmd)
3540 {
3541         int ret;
3542
3543         ret = cmd->se_tfo->write_pending(cmd);
3544         if (ret == -EAGAIN || ret == -ENOMEM) {
3545                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3546                          cmd);
3547                 transport_handle_queue_full(cmd, cmd->se_dev);
3548         }
3549 }
3550
3551 static int transport_generic_write_pending(struct se_cmd *cmd)
3552 {
3553         unsigned long flags;
3554         int ret;
3555
3556         spin_lock_irqsave(&cmd->t_state_lock, flags);
3557         cmd->t_state = TRANSPORT_WRITE_PENDING;
3558         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3559
3560         /*
3561          * Clear the se_cmd for WRITE_PENDING status in order to set
3562          * CMD_T_ACTIVE so that transport_generic_handle_data can be called
3563          * from HW target mode interrupt code.  This is safe to be called
3564          * with transport_off=1 before the cmd->se_tfo->write_pending
3565          * because the se_cmd->se_lun pointer is not being cleared.
3566          */
3567         transport_cmd_check_stop(cmd, 1, 0);
3568
3569         /*
3570          * Call the fabric write_pending function here to let the
3571          * frontend know that WRITE buffers are ready.
3572          */
3573         ret = cmd->se_tfo->write_pending(cmd);
3574         if (ret == -EAGAIN || ret == -ENOMEM)
3575                 goto queue_full;
3576         else if (ret < 0)
3577                 return ret;
3578
3579         return 1;
3580
3581 queue_full:
3582         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3583         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3584         transport_handle_queue_full(cmd, cmd->se_dev);
3585         return 0;
3586 }
3587
3588 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3589 {
3590         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3591                 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
3592                          transport_wait_for_tasks(cmd);
3593
3594                 transport_release_cmd(cmd);
3595         } else {
3596                 if (wait_for_tasks)
3597                         transport_wait_for_tasks(cmd);
3598
3599                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3600
3601                 if (cmd->se_lun)
3602                         transport_lun_remove_cmd(cmd);
3603
3604                 transport_put_cmd(cmd);
3605         }
3606 }
3607 EXPORT_SYMBOL(transport_generic_free_cmd);
3608
3609 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3610  * @se_sess:    session to reference
3611  * @se_cmd:     command descriptor to add
3612  * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
3613  */
3614 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
3615                         bool ack_kref)
3616 {
3617         unsigned long flags;
3618
3619         kref_init(&se_cmd->cmd_kref);
3620         /*
3621          * Add a second kref if the fabric caller is expecting to handle
3622          * fabric acknowledgement that requires two target_put_sess_cmd()
3623          * invocations before se_cmd descriptor release.
3624          */
3625         if (ack_kref == true) {
3626                 kref_get(&se_cmd->cmd_kref);
3627                 se_cmd->se_cmd_flags |= SCF_ACK_KREF;
3628         }
3629
3630         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3631         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3632         se_cmd->check_release = 1;
3633         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3634 }
3635 EXPORT_SYMBOL(target_get_sess_cmd);
3636
3637 static void target_release_cmd_kref(struct kref *kref)
3638 {
3639         struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
3640         struct se_session *se_sess = se_cmd->se_sess;
3641         unsigned long flags;
3642
3643         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3644         if (list_empty(&se_cmd->se_cmd_list)) {
3645                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3646                 se_cmd->se_tfo->release_cmd(se_cmd);
3647                 return;
3648         }
3649         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3650                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3651                 complete(&se_cmd->cmd_wait_comp);
3652                 return;
3653         }
3654         list_del(&se_cmd->se_cmd_list);
3655         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3656
3657         se_cmd->se_tfo->release_cmd(se_cmd);
3658 }
3659
3660 /* target_put_sess_cmd - Check for active I/O shutdown via kref_put
3661  * @se_sess:    session to reference
3662  * @se_cmd:     command descriptor to drop
3663  */
3664 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3665 {
3666         return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
3667 }
3668 EXPORT_SYMBOL(target_put_sess_cmd);
3669
3670 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3671  * @se_sess:    session to split
3672  */
3673 void target_splice_sess_cmd_list(struct se_session *se_sess)
3674 {
3675         struct se_cmd *se_cmd;
3676         unsigned long flags;
3677
3678         WARN_ON(!list_empty(&se_sess->sess_wait_list));
3679         INIT_LIST_HEAD(&se_sess->sess_wait_list);
3680
3681         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3682         se_sess->sess_tearing_down = 1;
3683
3684         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3685
3686         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3687                 se_cmd->cmd_wait_set = 1;
3688
3689         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3690 }
3691 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3692
3693 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3694  * @se_sess:    session to wait for active I/O
3695  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
3696  */
3697 void target_wait_for_sess_cmds(
3698         struct se_session *se_sess,
3699         int wait_for_tasks)
3700 {
3701         struct se_cmd *se_cmd, *tmp_cmd;
3702         bool rc = false;
3703
3704         list_for_each_entry_safe(se_cmd, tmp_cmd,
3705                                 &se_sess->sess_wait_list, se_cmd_list) {
3706                 list_del(&se_cmd->se_cmd_list);
3707
3708                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
3709                         " %d\n", se_cmd, se_cmd->t_state,
3710                         se_cmd->se_tfo->get_cmd_state(se_cmd));
3711
3712                 if (wait_for_tasks) {
3713                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
3714                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3715                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3716
3717                         rc = transport_wait_for_tasks(se_cmd);
3718
3719                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
3720                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3721                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3722                 }
3723
3724                 if (!rc) {
3725                         wait_for_completion(&se_cmd->cmd_wait_comp);
3726                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
3727                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
3728                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
3729                 }
3730
3731                 se_cmd->se_tfo->release_cmd(se_cmd);
3732         }
3733 }
3734 EXPORT_SYMBOL(target_wait_for_sess_cmds);
3735
3736 /*      transport_lun_wait_for_tasks():
3737  *
3738  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
3739  *      an struct se_lun to be successfully shutdown.
3740  */
3741 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
3742 {
3743         unsigned long flags;
3744         int ret = 0;
3745
3746         /*
3747          * If the frontend has already requested this struct se_cmd to
3748          * be stopped, we can safely ignore this struct se_cmd.
3749          */
3750         spin_lock_irqsave(&cmd->t_state_lock, flags);
3751         if (cmd->transport_state & CMD_T_STOP) {
3752                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3753
3754                 pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
3755                          cmd->se_tfo->get_task_tag(cmd));
3756                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3757                 transport_cmd_check_stop(cmd, 1, 0);
3758                 return -EPERM;
3759         }
3760         cmd->transport_state |= CMD_T_LUN_FE_STOP;
3761         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3762
3763         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3764
3765         // XXX: audit task_flags checks.
3766         spin_lock_irqsave(&cmd->t_state_lock, flags);
3767         if ((cmd->transport_state & CMD_T_BUSY) &&
3768             (cmd->transport_state & CMD_T_SENT)) {
3769                 if (!target_stop_cmd(cmd, &flags))
3770                         ret++;
3771                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3772         } else {
3773                 spin_unlock_irqrestore(&cmd->t_state_lock,
3774                                 flags);
3775                 target_remove_from_execute_list(cmd);
3776         }
3777
3778         pr_debug("ConfigFS: cmd: %p stop tasks ret:"
3779                         " %d\n", cmd, ret);
3780         if (!ret) {
3781                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
3782                                 cmd->se_tfo->get_task_tag(cmd));
3783                 wait_for_completion(&cmd->transport_lun_stop_comp);
3784                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
3785                                 cmd->se_tfo->get_task_tag(cmd));
3786         }
3787         transport_remove_cmd_from_queue(cmd);
3788
3789         return 0;
3790 }
3791
3792 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
3793 {
3794         struct se_cmd *cmd = NULL;
3795         unsigned long lun_flags, cmd_flags;
3796         /*
3797          * Do exception processing and return CHECK_CONDITION status to the
3798          * Initiator Port.
3799          */
3800         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3801         while (!list_empty(&lun->lun_cmd_list)) {
3802                 cmd = list_first_entry(&lun->lun_cmd_list,
3803                        struct se_cmd, se_lun_node);
3804                 list_del_init(&cmd->se_lun_node);
3805
3806                 /*
3807                  * This will notify iscsi_target_transport.c:
3808                  * transport_cmd_check_stop() that a LUN shutdown is in
3809                  * progress for the iscsi_cmd_t.
3810                  */
3811                 spin_lock(&cmd->t_state_lock);
3812                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
3813                         "_lun_stop for  ITT: 0x%08x\n",
3814                         cmd->se_lun->unpacked_lun,
3815                         cmd->se_tfo->get_task_tag(cmd));
3816                 cmd->transport_state |= CMD_T_LUN_STOP;
3817                 spin_unlock(&cmd->t_state_lock);
3818
3819                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3820
3821                 if (!cmd->se_lun) {
3822                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
3823                                 cmd->se_tfo->get_task_tag(cmd),
3824                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3825                         BUG();
3826                 }
3827                 /*
3828                  * If the Storage engine still owns the iscsi_cmd_t, determine
3829                  * and/or stop its context.
3830                  */
3831                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
3832                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
3833                         cmd->se_tfo->get_task_tag(cmd));
3834
3835                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
3836                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3837                         continue;
3838                 }
3839
3840                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
3841                         "_wait_for_tasks(): SUCCESS\n",
3842                         cmd->se_lun->unpacked_lun,
3843                         cmd->se_tfo->get_task_tag(cmd));
3844
3845                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3846                 if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
3847                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3848                         goto check_cond;
3849                 }
3850                 cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
3851                 target_remove_from_state_list(cmd);
3852                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3853
3854                 /*
3855                  * The Storage engine stopped this struct se_cmd before it was
3856                  * send to the fabric frontend for delivery back to the
3857                  * Initiator Node.  Return this SCSI CDB back with an
3858                  * CHECK_CONDITION status.
3859                  */
3860 check_cond:
3861                 transport_send_check_condition_and_sense(cmd,
3862                                 TCM_NON_EXISTENT_LUN, 0);
3863                 /*
3864                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
3865                  * be released, notify the waiting thread now that LU has
3866                  * finished accessing it.
3867                  */
3868                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
3869                 if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
3870                         pr_debug("SE_LUN[%d] - Detected FE stop for"
3871                                 " struct se_cmd: %p ITT: 0x%08x\n",
3872                                 lun->unpacked_lun,
3873                                 cmd, cmd->se_tfo->get_task_tag(cmd));
3874
3875                         spin_unlock_irqrestore(&cmd->t_state_lock,
3876                                         cmd_flags);
3877                         transport_cmd_check_stop(cmd, 1, 0);
3878                         complete(&cmd->transport_lun_fe_stop_comp);
3879                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3880                         continue;
3881                 }
3882                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
3883                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
3884
3885                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
3886                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
3887         }
3888         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
3889 }
3890
3891 static int transport_clear_lun_thread(void *p)
3892 {
3893         struct se_lun *lun = p;
3894
3895         __transport_clear_lun_from_sessions(lun);
3896         complete(&lun->lun_shutdown_comp);
3897
3898         return 0;
3899 }
3900
3901 int transport_clear_lun_from_sessions(struct se_lun *lun)
3902 {
3903         struct task_struct *kt;
3904
3905         kt = kthread_run(transport_clear_lun_thread, lun,
3906                         "tcm_cl_%u", lun->unpacked_lun);
3907         if (IS_ERR(kt)) {
3908                 pr_err("Unable to start clear_lun thread\n");
3909                 return PTR_ERR(kt);
3910         }
3911         wait_for_completion(&lun->lun_shutdown_comp);
3912
3913         return 0;
3914 }
3915
3916 /**
3917  * transport_wait_for_tasks - wait for completion to occur
3918  * @cmd:        command to wait
3919  *
3920  * Called from frontend fabric context to wait for storage engine
3921  * to pause and/or release frontend generated struct se_cmd.
3922  */
3923 bool transport_wait_for_tasks(struct se_cmd *cmd)
3924 {
3925         unsigned long flags;
3926
3927         spin_lock_irqsave(&cmd->t_state_lock, flags);
3928         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
3929             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3930                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3931                 return false;
3932         }
3933         /*
3934          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
3935          * has been set in transport_set_supported_SAM_opcode().
3936          */
3937         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
3938             !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
3939                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3940                 return false;
3941         }
3942         /*
3943          * If we are already stopped due to an external event (ie: LUN shutdown)
3944          * sleep until the connection can have the passed struct se_cmd back.
3945          * The cmd->transport_lun_stopped_sem will be upped by
3946          * transport_clear_lun_from_sessions() once the ConfigFS context caller
3947          * has completed its operation on the struct se_cmd.
3948          */
3949         if (cmd->transport_state & CMD_T_LUN_STOP) {
3950                 pr_debug("wait_for_tasks: Stopping"
3951                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
3952                         "_stop_comp); for ITT: 0x%08x\n",
3953                         cmd->se_tfo->get_task_tag(cmd));
3954                 /*
3955                  * There is a special case for WRITES where a FE exception +
3956                  * LUN shutdown means ConfigFS context is still sleeping on
3957                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
3958                  * We go ahead and up transport_lun_stop_comp just to be sure
3959                  * here.
3960                  */
3961                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3962                 complete(&cmd->transport_lun_stop_comp);
3963                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
3964                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3965
3966                 target_remove_from_state_list(cmd);
3967                 /*
3968                  * At this point, the frontend who was the originator of this
3969                  * struct se_cmd, now owns the structure and can be released through
3970                  * normal means below.
3971                  */
3972                 pr_debug("wait_for_tasks: Stopped"
3973                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
3974                         "stop_comp); for ITT: 0x%08x\n",
3975                         cmd->se_tfo->get_task_tag(cmd));
3976
3977                 cmd->transport_state &= ~CMD_T_LUN_STOP;
3978         }
3979
3980         if (!(cmd->transport_state & CMD_T_ACTIVE)) {
3981                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3982                 return false;
3983         }
3984
3985         cmd->transport_state |= CMD_T_STOP;
3986
3987         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
3988                 " i_state: %d, t_state: %d, CMD_T_STOP\n",
3989                 cmd, cmd->se_tfo->get_task_tag(cmd),
3990                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
3991
3992         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3993
3994         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
3995
3996         wait_for_completion(&cmd->t_transport_stop_comp);
3997
3998         spin_lock_irqsave(&cmd->t_state_lock, flags);
3999         cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
4000
4001         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4002                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4003                 cmd->se_tfo->get_task_tag(cmd));
4004
4005         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4006
4007         return true;
4008 }
4009 EXPORT_SYMBOL(transport_wait_for_tasks);
4010
4011 static int transport_get_sense_codes(
4012         struct se_cmd *cmd,
4013         u8 *asc,
4014         u8 *ascq)
4015 {
4016         *asc = cmd->scsi_asc;
4017         *ascq = cmd->scsi_ascq;
4018
4019         return 0;
4020 }
4021
4022 static int transport_set_sense_codes(
4023         struct se_cmd *cmd,
4024         u8 asc,
4025         u8 ascq)
4026 {
4027         cmd->scsi_asc = asc;
4028         cmd->scsi_ascq = ascq;
4029
4030         return 0;
4031 }
4032
4033 int transport_send_check_condition_and_sense(
4034         struct se_cmd *cmd,
4035         u8 reason,
4036         int from_transport)
4037 {
4038         unsigned char *buffer = cmd->sense_buffer;
4039         unsigned long flags;
4040         int offset;
4041         u8 asc = 0, ascq = 0;
4042
4043         spin_lock_irqsave(&cmd->t_state_lock, flags);
4044         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4045                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4046                 return 0;
4047         }
4048         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4049         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4050
4051         if (!reason && from_transport)
4052                 goto after_reason;
4053
4054         if (!from_transport)
4055                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4056         /*
4057          * Data Segment and SenseLength of the fabric response PDU.
4058          *
4059          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4060          * from include/scsi/scsi_cmnd.h
4061          */
4062         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4063                                 TRANSPORT_SENSE_BUFFER);
4064         /*
4065          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4066          * SENSE KEY values from include/scsi/scsi.h
4067          */
4068         switch (reason) {
4069         case TCM_NON_EXISTENT_LUN:
4070                 /* CURRENT ERROR */
4071                 buffer[offset] = 0x70;
4072                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4073                 /* ILLEGAL REQUEST */
4074                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4075                 /* LOGICAL UNIT NOT SUPPORTED */
4076                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4077                 break;
4078         case TCM_UNSUPPORTED_SCSI_OPCODE:
4079         case TCM_SECTOR_COUNT_TOO_MANY:
4080                 /* CURRENT ERROR */
4081                 buffer[offset] = 0x70;
4082                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4083                 /* ILLEGAL REQUEST */
4084                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4085                 /* INVALID COMMAND OPERATION CODE */
4086                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4087                 break;
4088         case TCM_UNKNOWN_MODE_PAGE:
4089                 /* CURRENT ERROR */
4090                 buffer[offset] = 0x70;
4091                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4092                 /* ILLEGAL REQUEST */
4093                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4094                 /* INVALID FIELD IN CDB */
4095                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4096                 break;
4097         case TCM_CHECK_CONDITION_ABORT_CMD:
4098                 /* CURRENT ERROR */
4099                 buffer[offset] = 0x70;
4100                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4101                 /* ABORTED COMMAND */
4102                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4103                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4104                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4105                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4106                 break;
4107         case TCM_INCORRECT_AMOUNT_OF_DATA:
4108                 /* CURRENT ERROR */
4109                 buffer[offset] = 0x70;
4110                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4111                 /* ABORTED COMMAND */
4112                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4113                 /* WRITE ERROR */
4114                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4115                 /* NOT ENOUGH UNSOLICITED DATA */
4116                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4117                 break;
4118         case TCM_INVALID_CDB_FIELD:
4119                 /* CURRENT ERROR */
4120                 buffer[offset] = 0x70;
4121                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4122                 /* ILLEGAL REQUEST */
4123                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4124                 /* INVALID FIELD IN CDB */
4125                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4126                 break;
4127         case TCM_INVALID_PARAMETER_LIST:
4128                 /* CURRENT ERROR */
4129                 buffer[offset] = 0x70;
4130                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4131                 /* ILLEGAL REQUEST */
4132                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4133                 /* INVALID FIELD IN PARAMETER LIST */
4134                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4135                 break;
4136         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4137                 /* CURRENT ERROR */
4138                 buffer[offset] = 0x70;
4139                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4140                 /* ABORTED COMMAND */
4141                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4142                 /* WRITE ERROR */
4143                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4144                 /* UNEXPECTED_UNSOLICITED_DATA */
4145                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4146                 break;
4147         case TCM_SERVICE_CRC_ERROR:
4148                 /* CURRENT ERROR */
4149                 buffer[offset] = 0x70;
4150                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4151                 /* ABORTED COMMAND */
4152                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4153                 /* PROTOCOL SERVICE CRC ERROR */
4154                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4155                 /* N/A */
4156                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4157                 break;
4158         case TCM_SNACK_REJECTED:
4159                 /* CURRENT ERROR */
4160                 buffer[offset] = 0x70;
4161                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4162                 /* ABORTED COMMAND */
4163                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4164                 /* READ ERROR */
4165                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4166                 /* FAILED RETRANSMISSION REQUEST */
4167                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4168                 break;
4169         case TCM_WRITE_PROTECTED:
4170                 /* CURRENT ERROR */
4171                 buffer[offset] = 0x70;
4172                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4173                 /* DATA PROTECT */
4174                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4175                 /* WRITE PROTECTED */
4176                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4177                 break;
4178         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4179                 /* CURRENT ERROR */
4180                 buffer[offset] = 0x70;
4181                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4182                 /* UNIT ATTENTION */
4183                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4184                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4185                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4186                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4187                 break;
4188         case TCM_CHECK_CONDITION_NOT_READY:
4189                 /* CURRENT ERROR */
4190                 buffer[offset] = 0x70;
4191                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4192                 /* Not Ready */
4193                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4194                 transport_get_sense_codes(cmd, &asc, &ascq);
4195                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4196                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4197                 break;
4198         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4199         default:
4200                 /* CURRENT ERROR */
4201                 buffer[offset] = 0x70;
4202                 buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
4203                 /* ILLEGAL REQUEST */
4204                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4205                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4206                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4207                 break;
4208         }
4209         /*
4210          * This code uses linux/include/scsi/scsi.h SAM status codes!
4211          */
4212         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4213         /*
4214          * Automatically padded, this value is encoded in the fabric's
4215          * data_length response PDU containing the SCSI defined sense data.
4216          */
4217         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4218
4219 after_reason:
4220         return cmd->se_tfo->queue_status(cmd);
4221 }
4222 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4223
4224 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4225 {
4226         int ret = 0;
4227
4228         if (cmd->transport_state & CMD_T_ABORTED) {
4229                 if (!send_status ||
4230                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4231                         return 1;
4232
4233                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4234                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4235                         cmd->t_task_cdb[0],
4236                         cmd->se_tfo->get_task_tag(cmd));
4237
4238                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4239                 cmd->se_tfo->queue_status(cmd);
4240                 ret = 1;
4241         }
4242         return ret;
4243 }
4244 EXPORT_SYMBOL(transport_check_aborted_status);
4245
4246 void transport_send_task_abort(struct se_cmd *cmd)
4247 {
4248         unsigned long flags;
4249
4250         spin_lock_irqsave(&cmd->t_state_lock, flags);
4251         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4252                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4253                 return;
4254         }
4255         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4256
4257         /*
4258          * If there are still expected incoming fabric WRITEs, we wait
4259          * until until they have completed before sending a TASK_ABORTED
4260          * response.  This response with TASK_ABORTED status will be
4261          * queued back to fabric module by transport_check_aborted_status().
4262          */
4263         if (cmd->data_direction == DMA_TO_DEVICE) {
4264                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4265                         cmd->transport_state |= CMD_T_ABORTED;
4266                         smp_mb__after_atomic_inc();
4267                 }
4268         }
4269         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4270
4271         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4272                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4273                 cmd->se_tfo->get_task_tag(cmd));
4274
4275         cmd->se_tfo->queue_status(cmd);
4276 }
4277
4278 static int transport_generic_do_tmr(struct se_cmd *cmd)
4279 {
4280         struct se_device *dev = cmd->se_dev;
4281         struct se_tmr_req *tmr = cmd->se_tmr_req;
4282         int ret;
4283
4284         switch (tmr->function) {
4285         case TMR_ABORT_TASK:
4286                 core_tmr_abort_task(dev, tmr, cmd->se_sess);
4287                 break;
4288         case TMR_ABORT_TASK_SET:
4289         case TMR_CLEAR_ACA:
4290         case TMR_CLEAR_TASK_SET:
4291                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4292                 break;
4293         case TMR_LUN_RESET:
4294                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4295                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4296                                          TMR_FUNCTION_REJECTED;
4297                 break;
4298         case TMR_TARGET_WARM_RESET:
4299                 tmr->response = TMR_FUNCTION_REJECTED;
4300                 break;
4301         case TMR_TARGET_COLD_RESET:
4302                 tmr->response = TMR_FUNCTION_REJECTED;
4303                 break;
4304         default:
4305                 pr_err("Uknown TMR function: 0x%02x.\n",
4306                                 tmr->function);
4307                 tmr->response = TMR_FUNCTION_REJECTED;
4308                 break;
4309         }
4310
4311         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4312         cmd->se_tfo->queue_tm_rsp(cmd);
4313
4314         transport_cmd_check_stop_to_fabric(cmd);
4315         return 0;
4316 }
4317
4318 /*      transport_processing_thread():
4319  *
4320  *
4321  */
4322 static int transport_processing_thread(void *param)
4323 {
4324         int ret;
4325         struct se_cmd *cmd;
4326         struct se_device *dev = param;
4327
4328         while (!kthread_should_stop()) {
4329                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4330                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4331                                 kthread_should_stop());
4332                 if (ret < 0)
4333                         goto out;
4334
4335 get_cmd:
4336                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4337                 if (!cmd)
4338                         continue;
4339
4340                 switch (cmd->t_state) {
4341                 case TRANSPORT_NEW_CMD:
4342                         BUG();
4343                         break;
4344                 case TRANSPORT_NEW_CMD_MAP:
4345                         if (!cmd->se_tfo->new_cmd_map) {
4346                                 pr_err("cmd->se_tfo->new_cmd_map is"
4347                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4348                                 BUG();
4349                         }
4350                         ret = cmd->se_tfo->new_cmd_map(cmd);
4351                         if (ret < 0) {
4352                                 transport_generic_request_failure(cmd);
4353                                 break;
4354                         }
4355                         ret = transport_generic_new_cmd(cmd);
4356                         if (ret < 0) {
4357                                 transport_generic_request_failure(cmd);
4358                                 break;
4359                         }
4360                         break;
4361                 case TRANSPORT_PROCESS_WRITE:
4362                         transport_generic_process_write(cmd);
4363                         break;
4364                 case TRANSPORT_PROCESS_TMR:
4365                         transport_generic_do_tmr(cmd);
4366                         break;
4367                 case TRANSPORT_COMPLETE_QF_WP:
4368                         transport_write_pending_qf(cmd);
4369                         break;
4370                 case TRANSPORT_COMPLETE_QF_OK:
4371                         transport_complete_qf(cmd);
4372                         break;
4373                 default:
4374                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4375                                 "i_state: %d on SE LUN: %u\n",
4376                                 cmd->t_state,
4377                                 cmd->se_tfo->get_task_tag(cmd),
4378                                 cmd->se_tfo->get_cmd_state(cmd),
4379                                 cmd->se_lun->unpacked_lun);
4380                         BUG();
4381                 }
4382
4383                 goto get_cmd;
4384         }
4385
4386 out:
4387         WARN_ON(!list_empty(&dev->state_list));
4388         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4389         dev->process_thread = NULL;
4390         return 0;
4391 }