drivers/target/target_core_transport.c

   1 /*******************************************************************************
   2  * Filename:  target_core_transport.c
   3  *
   4  * This file contains the Generic Target Engine Core.
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7  * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8  * Copyright (c) 2007-2010 Rising Tide Systems
   9  * Copyright (c) 2008-2010 Linux-iSCSI.org
  10  *
  11  * Nicholas A. Bellinger <nab@kernel.org>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  *
  27  ******************************************************************************/
  28
  29 #include <linux/net.h>
  30 #include <linux/delay.h>
  31 #include <linux/string.h>
  32 #include <linux/timer.h>
  33 #include <linux/slab.h>
  34 #include <linux/blkdev.h>
  35 #include <linux/spinlock.h>
  36 #include <linux/kthread.h>
  37 #include <linux/in.h>
  38 #include <linux/cdrom.h>
  39 #include <linux/module.h>
  40 #include <asm/unaligned.h>
  41 #include <net/sock.h>
  42 #include <net/tcp.h>
  43 #include <scsi/scsi.h>
  44 #include <scsi/scsi_cmnd.h>
  45 #include <scsi/scsi_tcq.h>
  46
  47 #include <target/target_core_base.h>
  48 #include <target/target_core_device.h>
  49 #include <target/target_core_tmr.h>
  50 #include <target/target_core_tpg.h>
  51 #include <target/target_core_transport.h>
  52 #include <target/target_core_fabric_ops.h>
  53 #include <target/target_core_configfs.h>
  54
  55 #include "target_core_internal.h"
  56 #include "target_core_alua.h"
  57 #include "target_core_pr.h"
  58 #include "target_core_ua.h"
  59
  60 static int sub_api_initialized;
  61
  62 static struct workqueue_struct *target_completion_wq;
  63 static struct kmem_cache *se_sess_cache;
  64 struct kmem_cache *se_tmr_req_cache;
  65 struct kmem_cache *se_ua_cache;
  66 struct kmem_cache *t10_pr_reg_cache;
  67 struct kmem_cache *t10_alua_lu_gp_cache;
  68 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  69 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  70 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  71
  72 static int transport_generic_write_pending(struct se_cmd *);
  73 static int transport_processing_thread(void *param);
  74 static int __transport_execute_tasks(struct se_device *dev);
  75 static void transport_complete_task_attr(struct se_cmd *cmd);
  76 static void transport_handle_queue_full(struct se_cmd *cmd,
  77                 struct se_device *dev);
  78 static void transport_free_dev_tasks(struct se_cmd *cmd);
  79 static int transport_generic_get_mem(struct se_cmd *cmd);
  80 static void transport_put_cmd(struct se_cmd *cmd);
  81 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  82 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  83 static void transport_generic_request_failure(struct se_cmd *);
  84 static void target_complete_ok_work(struct work_struct *work);
  85
  86 int init_se_kmem_caches(void)
  87 {
  88         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
  89                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
  90                         0, NULL);
  91         if (!se_tmr_req_cache) {
  92                 pr_err("kmem_cache_create() for struct se_tmr_req"
  93                                 " failed\n");
  94                 goto out;
  95         }
  96         se_sess_cache = kmem_cache_create("se_sess_cache",
  97                         sizeof(struct se_session), __alignof__(struct se_session),
  98                         0, NULL);
  99         if (!se_sess_cache) {
 100                 pr_err("kmem_cache_create() for struct se_session"
 101                                 " failed\n");
 102                 goto out_free_tmr_req_cache;
 103         }
 104         se_ua_cache = kmem_cache_create("se_ua_cache",
 105                         sizeof(struct se_ua), __alignof__(struct se_ua),
 106                         0, NULL);
 107         if (!se_ua_cache) {
 108                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 109                 goto out_free_sess_cache;
 110         }
 111         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 112                         sizeof(struct t10_pr_registration),
 113                         __alignof__(struct t10_pr_registration), 0, NULL);
 114         if (!t10_pr_reg_cache) {
 115                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 116                                 " failed\n");
 117                 goto out_free_ua_cache;
 118         }
 119         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 120                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 121                         0, NULL);
 122         if (!t10_alua_lu_gp_cache) {
 123                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 124                                 " failed\n");
 125                 goto out_free_pr_reg_cache;
 126         }
 127         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 128                         sizeof(struct t10_alua_lu_gp_member),
 129                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 130         if (!t10_alua_lu_gp_mem_cache) {
 131                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 132                                 "cache failed\n");
 133                 goto out_free_lu_gp_cache;
 134         }
 135         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 136                         sizeof(struct t10_alua_tg_pt_gp),
 137                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 138         if (!t10_alua_tg_pt_gp_cache) {
 139                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 140                                 "cache failed\n");
 141                 goto out_free_lu_gp_mem_cache;
 142         }
 143         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 144                         "t10_alua_tg_pt_gp_mem_cache",
 145                         sizeof(struct t10_alua_tg_pt_gp_member),
 146                         __alignof__(struct t10_alua_tg_pt_gp_member),
 147                         0, NULL);
 148         if (!t10_alua_tg_pt_gp_mem_cache) {
 149                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 150                                 "mem_t failed\n");
 151                 goto out_free_tg_pt_gp_cache;
 152         }
 153
 154         target_completion_wq = alloc_workqueue("target_completion",
 155                                                WQ_MEM_RECLAIM, 0);
 156         if (!target_completion_wq)
 157                 goto out_free_tg_pt_gp_mem_cache;
 158
 159         return 0;
 160
 161 out_free_tg_pt_gp_mem_cache:
 162         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 163 out_free_tg_pt_gp_cache:
 164         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 165 out_free_lu_gp_mem_cache:
 166         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 167 out_free_lu_gp_cache:
 168         kmem_cache_destroy(t10_alua_lu_gp_cache);
 169 out_free_pr_reg_cache:
 170         kmem_cache_destroy(t10_pr_reg_cache);
 171 out_free_ua_cache:
 172         kmem_cache_destroy(se_ua_cache);
 173 out_free_sess_cache:
 174         kmem_cache_destroy(se_sess_cache);
 175 out_free_tmr_req_cache:
 176         kmem_cache_destroy(se_tmr_req_cache);
 177 out:
 178         return -ENOMEM;
 179 }
 180
 181 void release_se_kmem_caches(void)
 182 {
 183         destroy_workqueue(target_completion_wq);
 184         kmem_cache_destroy(se_tmr_req_cache);
 185         kmem_cache_destroy(se_sess_cache);
 186         kmem_cache_destroy(se_ua_cache);
 187         kmem_cache_destroy(t10_pr_reg_cache);
 188         kmem_cache_destroy(t10_alua_lu_gp_cache);
 189         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 190         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 191         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 192 }
 193
 194 /* This code ensures unique mib indexes are handed out. */
 195 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 196 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 197
 198 /*
 199  * Allocate a new row index for the entry type specified
 200  */
 201 u32 scsi_get_new_index(scsi_index_t type)
 202 {
 203         u32 new_index;
 204
 205         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 206
 207         spin_lock(&scsi_mib_index_lock);
 208         new_index = ++scsi_mib_index[type];
 209         spin_unlock(&scsi_mib_index_lock);
 210
 211         return new_index;
 212 }
 213
 214 static void transport_init_queue_obj(struct se_queue_obj *qobj)
 215 {
 216         atomic_set(&qobj->queue_cnt, 0);
 217         INIT_LIST_HEAD(&qobj->qobj_list);
 218         init_waitqueue_head(&qobj->thread_wq);
 219         spin_lock_init(&qobj->cmd_queue_lock);
 220 }
 221
 222 void transport_subsystem_check_init(void)
 223 {
 224         int ret;
 225
 226         if (sub_api_initialized)
 227                 return;
 228
 229         ret = request_module("target_core_iblock");
 230         if (ret != 0)
 231                 pr_err("Unable to load target_core_iblock\n");
 232
 233         ret = request_module("target_core_file");
 234         if (ret != 0)
 235                 pr_err("Unable to load target_core_file\n");
 236
 237         ret = request_module("target_core_pscsi");
 238         if (ret != 0)
 239                 pr_err("Unable to load target_core_pscsi\n");
 240
 241         ret = request_module("target_core_stgt");
 242         if (ret != 0)
 243                 pr_err("Unable to load target_core_stgt\n");
 244
 245         sub_api_initialized = 1;
 246         return;
 247 }
 248
 249 struct se_session *transport_init_session(void)
 250 {
 251         struct se_session *se_sess;
 252
 253         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 254         if (!se_sess) {
 255                 pr_err("Unable to allocate struct se_session from"
 256                                 " se_sess_cache\n");
 257                 return ERR_PTR(-ENOMEM);
 258         }
 259         INIT_LIST_HEAD(&se_sess->sess_list);
 260         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 261         INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 262         INIT_LIST_HEAD(&se_sess->sess_wait_list);
 263         spin_lock_init(&se_sess->sess_cmd_lock);
 264
 265         return se_sess;
 266 }
 267 EXPORT_SYMBOL(transport_init_session);
 268
 269 /*
 270  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 271  */
 272 void __transport_register_session(
 273         struct se_portal_group *se_tpg,
 274         struct se_node_acl *se_nacl,
 275         struct se_session *se_sess,
 276         void *fabric_sess_ptr)
 277 {
 278         unsigned char buf[PR_REG_ISID_LEN];
 279
 280         se_sess->se_tpg = se_tpg;
 281         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 282         /*
 283          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 284          *
 285          * Only set for struct se_session's that will actually be moving I/O.
 286          * eg: *NOT* discovery sessions.
 287          */
 288         if (se_nacl) {
 289                 /*
 290                  * If the fabric module supports an ISID based TransportID,
 291                  * save this value in binary from the fabric I_T Nexus now.
 292                  */
 293                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 294                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 295                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 296                                         &buf[0], PR_REG_ISID_LEN);
 297                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 298                 }
 299                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 300                 /*
 301                  * The se_nacl->nacl_sess pointer will be set to the
 302                  * last active I_T Nexus for each struct se_node_acl.
 303                  */
 304                 se_nacl->nacl_sess = se_sess;
 305
 306                 list_add_tail(&se_sess->sess_acl_list,
 307                               &se_nacl->acl_sess_list);
 308                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 309         }
 310         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 311
 312         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 313                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 314 }
 315 EXPORT_SYMBOL(__transport_register_session);
 316
 317 void transport_register_session(
 318         struct se_portal_group *se_tpg,
 319         struct se_node_acl *se_nacl,
 320         struct se_session *se_sess,
 321         void *fabric_sess_ptr)
 322 {
 323         spin_lock_bh(&se_tpg->session_lock);
 324         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 325         spin_unlock_bh(&se_tpg->session_lock);
 326 }
 327 EXPORT_SYMBOL(transport_register_session);
 328
 329 void transport_deregister_session_configfs(struct se_session *se_sess)
 330 {
 331         struct se_node_acl *se_nacl;
 332         unsigned long flags;
 333         /*
 334          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 335          */
 336         se_nacl = se_sess->se_node_acl;
 337         if (se_nacl) {
 338                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 339                 list_del(&se_sess->sess_acl_list);
 340                 /*
 341                  * If the session list is empty, then clear the pointer.
 342                  * Otherwise, set the struct se_session pointer from the tail
 343                  * element of the per struct se_node_acl active session list.
 344                  */
 345                 if (list_empty(&se_nacl->acl_sess_list))
 346                         se_nacl->nacl_sess = NULL;
 347                 else {
 348                         se_nacl->nacl_sess = container_of(
 349                                         se_nacl->acl_sess_list.prev,
 350                                         struct se_session, sess_acl_list);
 351                 }
 352                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 353         }
 354 }
 355 EXPORT_SYMBOL(transport_deregister_session_configfs);
 356
 357 void transport_free_session(struct se_session *se_sess)
 358 {
 359         kmem_cache_free(se_sess_cache, se_sess);
 360 }
 361 EXPORT_SYMBOL(transport_free_session);
 362
 363 void transport_deregister_session(struct se_session *se_sess)
 364 {
 365         struct se_portal_group *se_tpg = se_sess->se_tpg;
 366         struct se_node_acl *se_nacl;
 367         unsigned long flags;
 368
 369         if (!se_tpg) {
 370                 transport_free_session(se_sess);
 371                 return;
 372         }
 373
 374         spin_lock_irqsave(&se_tpg->session_lock, flags);
 375         list_del(&se_sess->sess_list);
 376         se_sess->se_tpg = NULL;
 377         se_sess->fabric_sess_ptr = NULL;
 378         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 379
 380         /*
 381          * Determine if we need to do extra work for this initiator node's
 382          * struct se_node_acl if it had been previously dynamically generated.
 383          */
 384         se_nacl = se_sess->se_node_acl;
 385         if (se_nacl) {
 386                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 387                 if (se_nacl->dynamic_node_acl) {
 388                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 389                                         se_tpg)) {
 390                                 list_del(&se_nacl->acl_list);
 391                                 se_tpg->num_node_acls--;
 392                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 393
 394                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 395                                 core_free_device_list_for_node(se_nacl, se_tpg);
 396                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 397                                                 se_nacl);
 398                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 399                         }
 400                 }
 401                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 402         }
 403
 404         transport_free_session(se_sess);
 405
 406         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 407                 se_tpg->se_tpg_tfo->get_fabric_name());
 408 }
 409 EXPORT_SYMBOL(transport_deregister_session);
 410
 411 /*
 412  * Called with cmd->t_state_lock held.
 413  */
 414 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 415 {
 416         struct se_device *dev = cmd->se_dev;
 417         struct se_task *task;
 418         unsigned long flags;
 419
 420         if (!dev)
 421                 return;
 422
 423         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 424                 if (task->task_flags & TF_ACTIVE)
 425                         continue;
 426
 427                 if (!atomic_read(&task->task_state_active))
 428                         continue;
 429
 430                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 431                 list_del(&task->t_state_list);
 432                 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 433                         cmd->se_tfo->get_task_tag(cmd), dev, task);
 434                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 435
 436                 atomic_set(&task->task_state_active, 0);
 437                 atomic_dec(&cmd->t_task_cdbs_ex_left);
 438         }
 439 }
 440
 441 /*      transport_cmd_check_stop():
 442  *
 443  *      'transport_off = 1' determines if t_transport_active should be cleared.
 444  *      'transport_off = 2' determines if task_dev_state should be removed.
 445  *
 446  *      A non-zero u8 t_state sets cmd->t_state.
 447  *      Returns 1 when command is stopped, else 0.
 448  */
 449 static int transport_cmd_check_stop(
 450         struct se_cmd *cmd,
 451         int transport_off,
 452         u8 t_state)
 453 {
 454         unsigned long flags;
 455
 456         spin_lock_irqsave(&cmd->t_state_lock, flags);
 457         /*
 458          * Determine if IOCTL context caller in requesting the stopping of this
 459          * command for LUN shutdown purposes.
 460          */
 461         if (atomic_read(&cmd->transport_lun_stop)) {
 462                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 463                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 464                         cmd->se_tfo->get_task_tag(cmd));
 465
 466                 atomic_set(&cmd->t_transport_active, 0);
 467                 if (transport_off == 2)
 468                         transport_all_task_dev_remove_state(cmd);
 469                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 470
 471                 complete(&cmd->transport_lun_stop_comp);
 472                 return 1;
 473         }
 474         /*
 475          * Determine if frontend context caller is requesting the stopping of
 476          * this command for frontend exceptions.
 477          */
 478         if (atomic_read(&cmd->t_transport_stop)) {
 479                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 480                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 481                         cmd->se_tfo->get_task_tag(cmd));
 482
 483                 if (transport_off == 2)
 484                         transport_all_task_dev_remove_state(cmd);
 485
 486                 /*
 487                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 488                  * to FE.
 489                  */
 490                 if (transport_off == 2)
 491                         cmd->se_lun = NULL;
 492                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 493
 494                 complete(&cmd->t_transport_stop_comp);
 495                 return 1;
 496         }
 497         if (transport_off) {
 498                 atomic_set(&cmd->t_transport_active, 0);
 499                 if (transport_off == 2) {
 500                         transport_all_task_dev_remove_state(cmd);
 501                         /*
 502                          * Clear struct se_cmd->se_lun before the transport_off == 2
 503                          * handoff to fabric module.
 504                          */
 505                         cmd->se_lun = NULL;
 506                         /*
 507                          * Some fabric modules like tcm_loop can release
 508                          * their internally allocated I/O reference now and
 509                          * struct se_cmd now.
 510                          *
 511                          * Fabric modules are expected to return '1' here if the
 512                          * se_cmd being passed is released at this point,
 513                          * or zero if not being released.
 514                          */
 515                         if (cmd->se_tfo->check_stop_free != NULL) {
 516                                 spin_unlock_irqrestore(
 517                                         &cmd->t_state_lock, flags);
 518
 519                                 return cmd->se_tfo->check_stop_free(cmd);
 520                         }
 521                 }
 522                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 523
 524                 return 0;
 525         } else if (t_state)
 526                 cmd->t_state = t_state;
 527         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 528
 529         return 0;
 530 }
 531
 532 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 533 {
 534         return transport_cmd_check_stop(cmd, 2, 0);
 535 }
 536
 537 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 538 {
 539         struct se_lun *lun = cmd->se_lun;
 540         unsigned long flags;
 541
 542         if (!lun)
 543                 return;
 544
 545         spin_lock_irqsave(&cmd->t_state_lock, flags);
 546         if (!atomic_read(&cmd->transport_dev_active)) {
 547                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 548                 goto check_lun;
 549         }
 550         atomic_set(&cmd->transport_dev_active, 0);
 551         transport_all_task_dev_remove_state(cmd);
 552         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 553
 554
 555 check_lun:
 556         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 557         if (atomic_read(&cmd->transport_lun_active)) {
 558                 list_del(&cmd->se_lun_node);
 559                 atomic_set(&cmd->transport_lun_active, 0);
 560 #if 0
 561                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 562                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 563 #endif
 564         }
 565         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 566 }
 567
 568 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 569 {
 570         if (!cmd->se_tmr_req)
 571                 transport_lun_remove_cmd(cmd);
 572
 573         if (transport_cmd_check_stop_to_fabric(cmd))
 574                 return;
 575         if (remove) {
 576                 transport_remove_cmd_from_queue(cmd);
 577                 transport_put_cmd(cmd);
 578         }
 579 }
 580
 581 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 582                 bool at_head)
 583 {
 584         struct se_device *dev = cmd->se_dev;
 585         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 586         unsigned long flags;
 587
 588         if (t_state) {
 589                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 590                 cmd->t_state = t_state;
 591                 atomic_set(&cmd->t_transport_active, 1);
 592                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 593         }
 594
 595         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 596
 597         /* If the cmd is already on the list, remove it before we add it */
 598         if (!list_empty(&cmd->se_queue_node))
 599                 list_del(&cmd->se_queue_node);
 600         else
 601                 atomic_inc(&qobj->queue_cnt);
 602
 603         if (at_head)
 604                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 605         else
 606                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 607         atomic_set(&cmd->t_transport_queue_active, 1);
 608         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 609
 610         wake_up_interruptible(&qobj->thread_wq);
 611 }
 612
 613 static struct se_cmd *
 614 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 615 {
 616         struct se_cmd *cmd;
 617         unsigned long flags;
 618
 619         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 620         if (list_empty(&qobj->qobj_list)) {
 621                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 622                 return NULL;
 623         }
 624         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 625
 626         atomic_set(&cmd->t_transport_queue_active, 0);
 627
 628         list_del_init(&cmd->se_queue_node);
 629         atomic_dec(&qobj->queue_cnt);
 630         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 631
 632         return cmd;
 633 }
 634
 635 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 636 {
 637         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 638         unsigned long flags;
 639
 640         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 641         if (!atomic_read(&cmd->t_transport_queue_active)) {
 642                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 643                 return;
 644         }
 645         atomic_set(&cmd->t_transport_queue_active, 0);
 646         atomic_dec(&qobj->queue_cnt);
 647         list_del_init(&cmd->se_queue_node);
 648         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 649
 650         if (atomic_read(&cmd->t_transport_queue_active)) {
 651                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 652                         cmd->se_tfo->get_task_tag(cmd),
 653                         atomic_read(&cmd->t_transport_queue_active));
 654         }
 655 }
 656
 657 /*
 658  * Completion function used by TCM subsystem plugins (such as FILEIO)
 659  * for queueing up response from struct se_subsystem_api->do_task()
 660  */
 661 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 662 {
 663         struct se_task *task = list_entry(cmd->t_task_list.next,
 664                                 struct se_task, t_list);
 665
 666         if (good) {
 667                 cmd->scsi_status = SAM_STAT_GOOD;
 668                 task->task_scsi_status = GOOD;
 669         } else {
 670                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 671                 task->task_se_cmd->scsi_sense_reason =
 672                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 673
 674         }
 675
 676         transport_complete_task(task, good);
 677 }
 678 EXPORT_SYMBOL(transport_complete_sync_cache);
 679
 680 static void target_complete_failure_work(struct work_struct *work)
 681 {
 682         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 683
 684         transport_generic_request_failure(cmd);
 685 }
 686
 687 /*      transport_complete_task():
 688  *
 689  *      Called from interrupt and non interrupt context depending
 690  *      on the transport plugin.
 691  */
 692 void transport_complete_task(struct se_task *task, int success)
 693 {
 694         struct se_cmd *cmd = task->task_se_cmd;
 695         struct se_device *dev = cmd->se_dev;
 696         unsigned long flags;
 697 #if 0
 698         pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
 699                         cmd->t_task_cdb[0], dev);
 700 #endif
 701         if (dev)
 702                 atomic_inc(&dev->depth_left);
 703
 704         spin_lock_irqsave(&cmd->t_state_lock, flags);
 705         task->task_flags &= ~TF_ACTIVE;
 706
 707         /*
 708          * See if any sense data exists, if so set the TASK_SENSE flag.
 709          * Also check for any other post completion work that needs to be
 710          * done by the plugins.
 711          */
 712         if (dev && dev->transport->transport_complete) {
 713                 if (dev->transport->transport_complete(task) != 0) {
 714                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 715                         task->task_sense = 1;
 716                         success = 1;
 717                 }
 718         }
 719
 720         /*
 721          * See if we are waiting for outstanding struct se_task
 722          * to complete for an exception condition
 723          */
 724         if (task->task_flags & TF_REQUEST_STOP) {
 725                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 726                 complete(&task->task_stop_comp);
 727                 return;
 728         }
 729
 730         if (!success)
 731                 cmd->t_tasks_failed = 1;
 732
 733         /*
 734          * Decrement the outstanding t_task_cdbs_left count.  The last
 735          * struct se_task from struct se_cmd will complete itself into the
 736          * device queue depending upon int success.
 737          */
 738         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 739                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 740                 return;
 741         }
 742
 743         if (cmd->t_tasks_failed) {
 744                 if (!task->task_error_status) {
 745                         task->task_error_status =
 746                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 747                         cmd->scsi_sense_reason =
 748                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 749                 }
 750
 751                 INIT_WORK(&cmd->work, target_complete_failure_work);
 752         } else {
 753                 atomic_set(&cmd->t_transport_complete, 1);
 754                 INIT_WORK(&cmd->work, target_complete_ok_work);
 755         }
 756
 757         cmd->t_state = TRANSPORT_COMPLETE;
 758         atomic_set(&cmd->t_transport_active, 1);
 759         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 760
 761         queue_work(target_completion_wq, &cmd->work);
 762 }
 763 EXPORT_SYMBOL(transport_complete_task);
 764
 765 /*
 766  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 767  * struct se_task list are ready to be added to the active execution list
 768  * struct se_device
 769
 770  * Called with se_dev_t->execute_task_lock called.
 771  */
 772 static inline int transport_add_task_check_sam_attr(
 773         struct se_task *task,
 774         struct se_task *task_prev,
 775         struct se_device *dev)
 776 {
 777         /*
 778          * No SAM Task attribute emulation enabled, add to tail of
 779          * execution queue
 780          */
 781         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 782                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 783                 return 0;
 784         }
 785         /*
 786          * HEAD_OF_QUEUE attribute for received CDB, which means
 787          * the first task that is associated with a struct se_cmd goes to
 788          * head of the struct se_device->execute_task_list, and task_prev
 789          * after that for each subsequent task
 790          */
 791         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 792                 list_add(&task->t_execute_list,
 793                                 (task_prev != NULL) ?
 794                                 &task_prev->t_execute_list :
 795                                 &dev->execute_task_list);
 796
 797                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 798                                 " in execution queue\n",
 799                                 task->task_se_cmd->t_task_cdb[0]);
 800                 return 1;
 801         }
 802         /*
 803          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 804          * transitioned from Dermant -> Active state, and are added to the end
 805          * of the struct se_device->execute_task_list
 806          */
 807         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 808         return 0;
 809 }
 810
 811 /*      __transport_add_task_to_execute_queue():
 812  *
 813  *      Called with se_dev_t->execute_task_lock called.
 814  */
 815 static void __transport_add_task_to_execute_queue(
 816         struct se_task *task,
 817         struct se_task *task_prev,
 818         struct se_device *dev)
 819 {
 820         int head_of_queue;
 821
 822         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 823         atomic_inc(&dev->execute_tasks);
 824
 825         if (atomic_read(&task->task_state_active))
 826                 return;
 827         /*
 828          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 829          * state list as well.  Running with SAM Task Attribute emulation
 830          * will always return head_of_queue == 0 here
 831          */
 832         if (head_of_queue)
 833                 list_add(&task->t_state_list, (task_prev) ?
 834                                 &task_prev->t_state_list :
 835                                 &dev->state_task_list);
 836         else
 837                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 838
 839         atomic_set(&task->task_state_active, 1);
 840
 841         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 842                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 843                 task, dev);
 844 }
 845
 846 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 847 {
 848         struct se_device *dev = cmd->se_dev;
 849         struct se_task *task;
 850         unsigned long flags;
 851
 852         spin_lock_irqsave(&cmd->t_state_lock, flags);
 853         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 854                 if (atomic_read(&task->task_state_active))
 855                         continue;
 856
 857                 spin_lock(&dev->execute_task_lock);
 858                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 859                 atomic_set(&task->task_state_active, 1);
 860
 861                 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 862                         task->task_se_cmd->se_tfo->get_task_tag(
 863                         task->task_se_cmd), task, dev);
 864
 865                 spin_unlock(&dev->execute_task_lock);
 866         }
 867         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 868 }
 869
 870 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 871 {
 872         struct se_device *dev = cmd->se_dev;
 873         struct se_task *task, *task_prev = NULL;
 874         unsigned long flags;
 875
 876         spin_lock_irqsave(&dev->execute_task_lock, flags);
 877         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 878                 if (!list_empty(&task->t_execute_list))
 879                         continue;
 880                 /*
 881                  * __transport_add_task_to_execute_queue() handles the
 882                  * SAM Task Attribute emulation if enabled
 883                  */
 884                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 885                 task_prev = task;
 886         }
 887         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 888 }
 889
 890 void __transport_remove_task_from_execute_queue(struct se_task *task,
 891                 struct se_device *dev)
 892 {
 893         list_del_init(&task->t_execute_list);
 894         atomic_dec(&dev->execute_tasks);
 895 }
 896
 897 static void transport_remove_task_from_execute_queue(
 898         struct se_task *task,
 899         struct se_device *dev)
 900 {
 901         unsigned long flags;
 902
 903         if (WARN_ON(list_empty(&task->t_execute_list)))
 904                 return;
 905
 906         spin_lock_irqsave(&dev->execute_task_lock, flags);
 907         __transport_remove_task_from_execute_queue(task, dev);
 908         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 909 }
 910
 911 /*
 912  * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 913  */
 914
 915 static void target_qf_do_work(struct work_struct *work)
 916 {
 917         struct se_device *dev = container_of(work, struct se_device,
 918                                         qf_work_queue);
 919         LIST_HEAD(qf_cmd_list);
 920         struct se_cmd *cmd, *cmd_tmp;
 921
 922         spin_lock_irq(&dev->qf_cmd_lock);
 923         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 924         spin_unlock_irq(&dev->qf_cmd_lock);
 925
 926         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 927                 list_del(&cmd->se_qf_node);
 928                 atomic_dec(&dev->dev_qf_count);
 929                 smp_mb__after_atomic_dec();
 930
 931                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 932                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 933                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 934                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 935                         : "UNKNOWN");
 936
 937                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 938         }
 939 }
 940
 941 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 942 {
 943         switch (cmd->data_direction) {
 944         case DMA_NONE:
 945                 return "NONE";
 946         case DMA_FROM_DEVICE:
 947                 return "READ";
 948         case DMA_TO_DEVICE:
 949                 return "WRITE";
 950         case DMA_BIDIRECTIONAL:
 951                 return "BIDI";
 952         default:
 953                 break;
 954         }
 955
 956         return "UNKNOWN";
 957 }
 958
 959 void transport_dump_dev_state(
 960         struct se_device *dev,
 961         char *b,
 962         int *bl)
 963 {
 964         *bl += sprintf(b + *bl, "Status: ");
 965         switch (dev->dev_status) {
 966         case TRANSPORT_DEVICE_ACTIVATED:
 967                 *bl += sprintf(b + *bl, "ACTIVATED");
 968                 break;
 969         case TRANSPORT_DEVICE_DEACTIVATED:
 970                 *bl += sprintf(b + *bl, "DEACTIVATED");
 971                 break;
 972         case TRANSPORT_DEVICE_SHUTDOWN:
 973                 *bl += sprintf(b + *bl, "SHUTDOWN");
 974                 break;
 975         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 976         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 977                 *bl += sprintf(b + *bl, "OFFLINE");
 978                 break;
 979         default:
 980                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 981                 break;
 982         }
 983
 984         *bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
 985                 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
 986                 dev->queue_depth);
 987         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
 988                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
 989         *bl += sprintf(b + *bl, "        ");
 990 }
 991
 992 void transport_dump_vpd_proto_id(
 993         struct t10_vpd *vpd,
 994         unsigned char *p_buf,
 995         int p_buf_len)
 996 {
 997         unsigned char buf[VPD_TMP_BUF_SIZE];
 998         int len;
 999
1000         memset(buf, 0, VPD_TMP_BUF_SIZE);
1001         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1002
1003         switch (vpd->protocol_identifier) {
1004         case 0x00:
1005                 sprintf(buf+len, "Fibre Channel\n");
1006                 break;
1007         case 0x10:
1008                 sprintf(buf+len, "Parallel SCSI\n");
1009                 break;
1010         case 0x20:
1011                 sprintf(buf+len, "SSA\n");
1012                 break;
1013         case 0x30:
1014                 sprintf(buf+len, "IEEE 1394\n");
1015                 break;
1016         case 0x40:
1017                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1018                                 " Protocol\n");
1019                 break;
1020         case 0x50:
1021                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1022                 break;
1023         case 0x60:
1024                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1025                 break;
1026         case 0x70:
1027                 sprintf(buf+len, "Automation/Drive Interface Transport"
1028                                 " Protocol\n");
1029                 break;
1030         case 0x80:
1031                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1032                 break;
1033         default:
1034                 sprintf(buf+len, "Unknown 0x%02x\n",
1035                                 vpd->protocol_identifier);
1036                 break;
1037         }
1038
1039         if (p_buf)
1040                 strncpy(p_buf, buf, p_buf_len);
1041         else
1042                 pr_debug("%s", buf);
1043 }
1044
1045 void
1046 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1047 {
1048         /*
1049          * Check if the Protocol Identifier Valid (PIV) bit is set..
1050          *
1051          * from spc3r23.pdf section 7.5.1
1052          */
1053          if (page_83[1] & 0x80) {
1054                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1055                 vpd->protocol_identifier_set = 1;
1056                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1057         }
1058 }
1059 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1060
1061 int transport_dump_vpd_assoc(
1062         struct t10_vpd *vpd,
1063         unsigned char *p_buf,
1064         int p_buf_len)
1065 {
1066         unsigned char buf[VPD_TMP_BUF_SIZE];
1067         int ret = 0;
1068         int len;
1069
1070         memset(buf, 0, VPD_TMP_BUF_SIZE);
1071         len = sprintf(buf, "T10 VPD Identifier Association: ");
1072
1073         switch (vpd->association) {
1074         case 0x00:
1075                 sprintf(buf+len, "addressed logical unit\n");
1076                 break;
1077         case 0x10:
1078                 sprintf(buf+len, "target port\n");
1079                 break;
1080         case 0x20:
1081                 sprintf(buf+len, "SCSI target device\n");
1082                 break;
1083         default:
1084                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1085                 ret = -EINVAL;
1086                 break;
1087         }
1088
1089         if (p_buf)
1090                 strncpy(p_buf, buf, p_buf_len);
1091         else
1092                 pr_debug("%s", buf);
1093
1094         return ret;
1095 }
1096
1097 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1098 {
1099         /*
1100          * The VPD identification association..
1101          *
1102          * from spc3r23.pdf Section 7.6.3.1 Table 297
1103          */
1104         vpd->association = (page_83[1] & 0x30);
1105         return transport_dump_vpd_assoc(vpd, NULL, 0);
1106 }
1107 EXPORT_SYMBOL(transport_set_vpd_assoc);
1108
1109 int transport_dump_vpd_ident_type(
1110         struct t10_vpd *vpd,
1111         unsigned char *p_buf,
1112         int p_buf_len)
1113 {
1114         unsigned char buf[VPD_TMP_BUF_SIZE];
1115         int ret = 0;
1116         int len;
1117
1118         memset(buf, 0, VPD_TMP_BUF_SIZE);
1119         len = sprintf(buf, "T10 VPD Identifier Type: ");
1120
1121         switch (vpd->device_identifier_type) {
1122         case 0x00:
1123                 sprintf(buf+len, "Vendor specific\n");
1124                 break;
1125         case 0x01:
1126                 sprintf(buf+len, "T10 Vendor ID based\n");
1127                 break;
1128         case 0x02:
1129                 sprintf(buf+len, "EUI-64 based\n");
1130                 break;
1131         case 0x03:
1132                 sprintf(buf+len, "NAA\n");
1133                 break;
1134         case 0x04:
1135                 sprintf(buf+len, "Relative target port identifier\n");
1136                 break;
1137         case 0x08:
1138                 sprintf(buf+len, "SCSI name string\n");
1139                 break;
1140         default:
1141                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1142                                 vpd->device_identifier_type);
1143                 ret = -EINVAL;
1144                 break;
1145         }
1146
1147         if (p_buf) {
1148                 if (p_buf_len < strlen(buf)+1)
1149                         return -EINVAL;
1150                 strncpy(p_buf, buf, p_buf_len);
1151         } else {
1152                 pr_debug("%s", buf);
1153         }
1154
1155         return ret;
1156 }
1157
1158 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1159 {
1160         /*
1161          * The VPD identifier type..
1162          *
1163          * from spc3r23.pdf Section 7.6.3.1 Table 298
1164          */
1165         vpd->device_identifier_type = (page_83[1] & 0x0f);
1166         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1167 }
1168 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1169
1170 int transport_dump_vpd_ident(
1171         struct t10_vpd *vpd,
1172         unsigned char *p_buf,
1173         int p_buf_len)
1174 {
1175         unsigned char buf[VPD_TMP_BUF_SIZE];
1176         int ret = 0;
1177
1178         memset(buf, 0, VPD_TMP_BUF_SIZE);
1179
1180         switch (vpd->device_identifier_code_set) {
1181         case 0x01: /* Binary */
1182                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1183                         &vpd->device_identifier[0]);
1184                 break;
1185         case 0x02: /* ASCII */
1186                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1187                         &vpd->device_identifier[0]);
1188                 break;
1189         case 0x03: /* UTF-8 */
1190                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1191                         &vpd->device_identifier[0]);
1192                 break;
1193         default:
1194                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1195                         " 0x%02x", vpd->device_identifier_code_set);
1196                 ret = -EINVAL;
1197                 break;
1198         }
1199
1200         if (p_buf)
1201                 strncpy(p_buf, buf, p_buf_len);
1202         else
1203                 pr_debug("%s", buf);
1204
1205         return ret;
1206 }
1207
1208 int
1209 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1210 {
1211         static const char hex_str[] = "0123456789abcdef";
1212         int j = 0, i = 4; /* offset to start of the identifer */
1213
1214         /*
1215          * The VPD Code Set (encoding)
1216          *
1217          * from spc3r23.pdf Section 7.6.3.1 Table 296
1218          */
1219         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1220         switch (vpd->device_identifier_code_set) {
1221         case 0x01: /* Binary */
1222                 vpd->device_identifier[j++] =
1223                                 hex_str[vpd->device_identifier_type];
1224                 while (i < (4 + page_83[3])) {
1225                         vpd->device_identifier[j++] =
1226                                 hex_str[(page_83[i] & 0xf0) >> 4];
1227                         vpd->device_identifier[j++] =
1228                                 hex_str[page_83[i] & 0x0f];
1229                         i++;
1230                 }
1231                 break;
1232         case 0x02: /* ASCII */
1233         case 0x03: /* UTF-8 */
1234                 while (i < (4 + page_83[3]))
1235                         vpd->device_identifier[j++] = page_83[i++];
1236                 break;
1237         default:
1238                 break;
1239         }
1240
1241         return transport_dump_vpd_ident(vpd, NULL, 0);
1242 }
1243 EXPORT_SYMBOL(transport_set_vpd_ident);
1244
1245 static void core_setup_task_attr_emulation(struct se_device *dev)
1246 {
1247         /*
1248          * If this device is from Target_Core_Mod/pSCSI, disable the
1249          * SAM Task Attribute emulation.
1250          *
1251          * This is currently not available in upsream Linux/SCSI Target
1252          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1253          */
1254         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1255                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1256                 return;
1257         }
1258
1259         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1260         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1261                 " device\n", dev->transport->name,
1262                 dev->transport->get_device_rev(dev));
1263 }
1264
1265 static void scsi_dump_inquiry(struct se_device *dev)
1266 {
1267         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1268         int i, device_type;
1269         /*
1270          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1271          */
1272         pr_debug("  Vendor: ");
1273         for (i = 0; i < 8; i++)
1274                 if (wwn->vendor[i] >= 0x20)
1275                         pr_debug("%c", wwn->vendor[i]);
1276                 else
1277                         pr_debug(" ");
1278
1279         pr_debug("  Model: ");
1280         for (i = 0; i < 16; i++)
1281                 if (wwn->model[i] >= 0x20)
1282                         pr_debug("%c", wwn->model[i]);
1283                 else
1284                         pr_debug(" ");
1285
1286         pr_debug("  Revision: ");
1287         for (i = 0; i < 4; i++)
1288                 if (wwn->revision[i] >= 0x20)
1289                         pr_debug("%c", wwn->revision[i]);
1290                 else
1291                         pr_debug(" ");
1292
1293         pr_debug("\n");
1294
1295         device_type = dev->transport->get_device_type(dev);
1296         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1297         pr_debug("                 ANSI SCSI revision: %02x\n",
1298                                 dev->transport->get_device_rev(dev));
1299 }
1300
1301 struct se_device *transport_add_device_to_core_hba(
1302         struct se_hba *hba,
1303         struct se_subsystem_api *transport,
1304         struct se_subsystem_dev *se_dev,
1305         u32 device_flags,
1306         void *transport_dev,
1307         struct se_dev_limits *dev_limits,
1308         const char *inquiry_prod,
1309         const char *inquiry_rev)
1310 {
1311         int force_pt;
1312         struct se_device  *dev;
1313
1314         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1315         if (!dev) {
1316                 pr_err("Unable to allocate memory for se_dev_t\n");
1317                 return NULL;
1318         }
1319
1320         transport_init_queue_obj(&dev->dev_queue_obj);
1321         dev->dev_flags          = device_flags;
1322         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1323         dev->dev_ptr            = transport_dev;
1324         dev->se_hba             = hba;
1325         dev->se_sub_dev         = se_dev;
1326         dev->transport          = transport;
1327         INIT_LIST_HEAD(&dev->dev_list);
1328         INIT_LIST_HEAD(&dev->dev_sep_list);
1329         INIT_LIST_HEAD(&dev->dev_tmr_list);
1330         INIT_LIST_HEAD(&dev->execute_task_list);
1331         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1332         INIT_LIST_HEAD(&dev->state_task_list);
1333         INIT_LIST_HEAD(&dev->qf_cmd_list);
1334         spin_lock_init(&dev->execute_task_lock);
1335         spin_lock_init(&dev->delayed_cmd_lock);
1336         spin_lock_init(&dev->dev_reservation_lock);
1337         spin_lock_init(&dev->dev_status_lock);
1338         spin_lock_init(&dev->se_port_lock);
1339         spin_lock_init(&dev->se_tmr_lock);
1340         spin_lock_init(&dev->qf_cmd_lock);
1341
1342         dev->queue_depth        = dev_limits->queue_depth;
1343         atomic_set(&dev->depth_left, dev->queue_depth);
1344         atomic_set(&dev->dev_ordered_id, 0);
1345
1346         se_dev_set_default_attribs(dev, dev_limits);
1347
1348         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1349         dev->creation_time = get_jiffies_64();
1350         spin_lock_init(&dev->stats_lock);
1351
1352         spin_lock(&hba->device_lock);
1353         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1354         hba->dev_count++;
1355         spin_unlock(&hba->device_lock);
1356         /*
1357          * Setup the SAM Task Attribute emulation for struct se_device
1358          */
1359         core_setup_task_attr_emulation(dev);
1360         /*
1361          * Force PR and ALUA passthrough emulation with internal object use.
1362          */
1363         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1364         /*
1365          * Setup the Reservations infrastructure for struct se_device
1366          */
1367         core_setup_reservations(dev, force_pt);
1368         /*
1369          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1370          */
1371         if (core_setup_alua(dev, force_pt) < 0)
1372                 goto out;
1373
1374         /*
1375          * Startup the struct se_device processing thread
1376          */
1377         dev->process_thread = kthread_run(transport_processing_thread, dev,
1378                                           "LIO_%s", dev->transport->name);
1379         if (IS_ERR(dev->process_thread)) {
1380                 pr_err("Unable to create kthread: LIO_%s\n",
1381                         dev->transport->name);
1382                 goto out;
1383         }
1384         /*
1385          * Setup work_queue for QUEUE_FULL
1386          */
1387         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1388         /*
1389          * Preload the initial INQUIRY const values if we are doing
1390          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1391          * passthrough because this is being provided by the backend LLD.
1392          * This is required so that transport_get_inquiry() copies these
1393          * originals once back into DEV_T10_WWN(dev) for the virtual device
1394          * setup.
1395          */
1396         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1397                 if (!inquiry_prod || !inquiry_rev) {
1398                         pr_err("All non TCM/pSCSI plugins require"
1399                                 " INQUIRY consts\n");
1400                         goto out;
1401                 }
1402
1403                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1404                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1405                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1406         }
1407         scsi_dump_inquiry(dev);
1408
1409         return dev;
1410 out:
1411         kthread_stop(dev->process_thread);
1412
1413         spin_lock(&hba->device_lock);
1414         list_del(&dev->dev_list);
1415         hba->dev_count--;
1416         spin_unlock(&hba->device_lock);
1417
1418         se_release_vpd_for_dev(dev);
1419
1420         kfree(dev);
1421
1422         return NULL;
1423 }
1424 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1425
1426 /*      transport_generic_prepare_cdb():
1427  *
1428  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1429  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1430  *      The point of this is since we are mapping iSCSI LUNs to
1431  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1432  *      devices and HBAs for a loop.
1433  */
1434 static inline void transport_generic_prepare_cdb(
1435         unsigned char *cdb)
1436 {
1437         switch (cdb[0]) {
1438         case READ_10: /* SBC - RDProtect */
1439         case READ_12: /* SBC - RDProtect */
1440         case READ_16: /* SBC - RDProtect */
1441         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1442         case VERIFY: /* SBC - VRProtect */
1443         case VERIFY_16: /* SBC - VRProtect */
1444         case WRITE_VERIFY: /* SBC - VRProtect */
1445         case WRITE_VERIFY_12: /* SBC - VRProtect */
1446                 break;
1447         default:
1448                 cdb[1] &= 0x1f; /* clear logical unit number */
1449                 break;
1450         }
1451 }
1452
1453 static struct se_task *
1454 transport_generic_get_task(struct se_cmd *cmd,
1455                 enum dma_data_direction data_direction)
1456 {
1457         struct se_task *task;
1458         struct se_device *dev = cmd->se_dev;
1459
1460         task = dev->transport->alloc_task(cmd->t_task_cdb);
1461         if (!task) {
1462                 pr_err("Unable to allocate struct se_task\n");
1463                 return NULL;
1464         }
1465
1466         INIT_LIST_HEAD(&task->t_list);
1467         INIT_LIST_HEAD(&task->t_execute_list);
1468         INIT_LIST_HEAD(&task->t_state_list);
1469         init_completion(&task->task_stop_comp);
1470         task->task_se_cmd = cmd;
1471         task->task_data_direction = data_direction;
1472
1473         return task;
1474 }
1475
1476 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1477
1478 /*
1479  * Used by fabric modules containing a local struct se_cmd within their
1480  * fabric dependent per I/O descriptor.
1481  */
1482 void transport_init_se_cmd(
1483         struct se_cmd *cmd,
1484         struct target_core_fabric_ops *tfo,
1485         struct se_session *se_sess,
1486         u32 data_length,
1487         int data_direction,
1488         int task_attr,
1489         unsigned char *sense_buffer)
1490 {
1491         INIT_LIST_HEAD(&cmd->se_lun_node);
1492         INIT_LIST_HEAD(&cmd->se_delayed_node);
1493         INIT_LIST_HEAD(&cmd->se_qf_node);
1494         INIT_LIST_HEAD(&cmd->se_queue_node);
1495         INIT_LIST_HEAD(&cmd->se_cmd_list);
1496         INIT_LIST_HEAD(&cmd->t_task_list);
1497         init_completion(&cmd->transport_lun_fe_stop_comp);
1498         init_completion(&cmd->transport_lun_stop_comp);
1499         init_completion(&cmd->t_transport_stop_comp);
1500         init_completion(&cmd->cmd_wait_comp);
1501         spin_lock_init(&cmd->t_state_lock);
1502         atomic_set(&cmd->transport_dev_active, 1);
1503
1504         cmd->se_tfo = tfo;
1505         cmd->se_sess = se_sess;
1506         cmd->data_length = data_length;
1507         cmd->data_direction = data_direction;
1508         cmd->sam_task_attr = task_attr;
1509         cmd->sense_buffer = sense_buffer;
1510 }
1511 EXPORT_SYMBOL(transport_init_se_cmd);
1512
1513 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1514 {
1515         /*
1516          * Check if SAM Task Attribute emulation is enabled for this
1517          * struct se_device storage object
1518          */
1519         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1520                 return 0;
1521
1522         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1523                 pr_debug("SAM Task Attribute ACA"
1524                         " emulation is not supported\n");
1525                 return -EINVAL;
1526         }
1527         /*
1528          * Used to determine when ORDERED commands should go from
1529          * Dormant to Active status.
1530          */
1531         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1532         smp_mb__after_atomic_inc();
1533         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1534                         cmd->se_ordered_id, cmd->sam_task_attr,
1535                         cmd->se_dev->transport->name);
1536         return 0;
1537 }
1538
1539 /*      transport_generic_allocate_tasks():
1540  *
1541  *      Called from fabric RX Thread.
1542  */
1543 int transport_generic_allocate_tasks(
1544         struct se_cmd *cmd,
1545         unsigned char *cdb)
1546 {
1547         int ret;
1548
1549         transport_generic_prepare_cdb(cdb);
1550         /*
1551          * Ensure that the received CDB is less than the max (252 + 8) bytes
1552          * for VARIABLE_LENGTH_CMD
1553          */
1554         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1555                 pr_err("Received SCSI CDB with command_size: %d that"
1556                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1557                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1558                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1559                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1560                 return -EINVAL;
1561         }
1562         /*
1563          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1564          * allocate the additional extended CDB buffer now..  Otherwise
1565          * setup the pointer from __t_task_cdb to t_task_cdb.
1566          */
1567         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1568                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1569                                                 GFP_KERNEL);
1570                 if (!cmd->t_task_cdb) {
1571                         pr_err("Unable to allocate cmd->t_task_cdb"
1572                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1573                                 scsi_command_size(cdb),
1574                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1575                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1576                         cmd->scsi_sense_reason =
1577                                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1578                         return -ENOMEM;
1579                 }
1580         } else
1581                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1582         /*
1583          * Copy the original CDB into cmd->
1584          */
1585         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1586         /*
1587          * Setup the received CDB based on SCSI defined opcodes and
1588          * perform unit attention, persistent reservations and ALUA
1589          * checks for virtual device backends.  The cmd->t_task_cdb
1590          * pointer is expected to be setup before we reach this point.
1591          */
1592         ret = transport_generic_cmd_sequencer(cmd, cdb);
1593         if (ret < 0)
1594                 return ret;
1595         /*
1596          * Check for SAM Task Attribute Emulation
1597          */
1598         if (transport_check_alloc_task_attr(cmd) < 0) {
1599                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1600                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1601                 return -EINVAL;
1602         }
1603         spin_lock(&cmd->se_lun->lun_sep_lock);
1604         if (cmd->se_lun->lun_sep)
1605                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1606         spin_unlock(&cmd->se_lun->lun_sep_lock);
1607         return 0;
1608 }
1609 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1610
1611 /*
1612  * Used by fabric module frontends to queue tasks directly.
1613  * Many only be used from process context only
1614  */
1615 int transport_handle_cdb_direct(
1616         struct se_cmd *cmd)
1617 {
1618         int ret;
1619
1620         if (!cmd->se_lun) {
1621                 dump_stack();
1622                 pr_err("cmd->se_lun is NULL\n");
1623                 return -EINVAL;
1624         }
1625         if (in_interrupt()) {
1626                 dump_stack();
1627                 pr_err("transport_generic_handle_cdb cannot be called"
1628                                 " from interrupt context\n");
1629                 return -EINVAL;
1630         }
1631         /*
1632          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1633          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1634          * in existing usage to ensure that outstanding descriptors are handled
1635          * correctly during shutdown via transport_wait_for_tasks()
1636          *
1637          * Also, we don't take cmd->t_state_lock here as we only expect
1638          * this to be called for initial descriptor submission.
1639          */
1640         cmd->t_state = TRANSPORT_NEW_CMD;
1641         atomic_set(&cmd->t_transport_active, 1);
1642         /*
1643          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1644          * so follow TRANSPORT_NEW_CMD processing thread context usage
1645          * and call transport_generic_request_failure() if necessary..
1646          */
1647         ret = transport_generic_new_cmd(cmd);
1648         if (ret < 0)
1649                 transport_generic_request_failure(cmd);
1650
1651         return 0;
1652 }
1653 EXPORT_SYMBOL(transport_handle_cdb_direct);
1654
1655 /*
1656  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1657  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1658  * complete setup in TCM process context w/ TFO->new_cmd_map().
1659  */
1660 int transport_generic_handle_cdb_map(
1661         struct se_cmd *cmd)
1662 {
1663         if (!cmd->se_lun) {
1664                 dump_stack();
1665                 pr_err("cmd->se_lun is NULL\n");
1666                 return -EINVAL;
1667         }
1668
1669         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1670         return 0;
1671 }
1672 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1673
1674 /*      transport_generic_handle_data():
1675  *
1676  *
1677  */
1678 int transport_generic_handle_data(
1679         struct se_cmd *cmd)
1680 {
1681         /*
1682          * For the software fabric case, then we assume the nexus is being
1683          * failed/shutdown when signals are pending from the kthread context
1684          * caller, so we return a failure.  For the HW target mode case running
1685          * in interrupt code, the signal_pending() check is skipped.
1686          */
1687         if (!in_interrupt() && signal_pending(current))
1688                 return -EPERM;
1689         /*
1690          * If the received CDB has aleady been ABORTED by the generic
1691          * target engine, we now call transport_check_aborted_status()
1692          * to queue any delated TASK_ABORTED status for the received CDB to the
1693          * fabric module as we are expecting no further incoming DATA OUT
1694          * sequences at this point.
1695          */
1696         if (transport_check_aborted_status(cmd, 1) != 0)
1697                 return 0;
1698
1699         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1700         return 0;
1701 }
1702 EXPORT_SYMBOL(transport_generic_handle_data);
1703
1704 /*      transport_generic_handle_tmr():
1705  *
1706  *
1707  */
1708 int transport_generic_handle_tmr(
1709         struct se_cmd *cmd)
1710 {
1711         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1712         return 0;
1713 }
1714 EXPORT_SYMBOL(transport_generic_handle_tmr);
1715
1716 /*
1717  * If the task is active, request it to be stopped and sleep until it
1718  * has completed.
1719  */
1720 bool target_stop_task(struct se_task *task, unsigned long *flags)
1721 {
1722         struct se_cmd *cmd = task->task_se_cmd;
1723         bool was_active = false;
1724
1725         if (task->task_flags & TF_ACTIVE) {
1726                 task->task_flags |= TF_REQUEST_STOP;
1727                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1728
1729                 pr_debug("Task %p waiting to complete\n", task);
1730                 wait_for_completion(&task->task_stop_comp);
1731                 pr_debug("Task %p stopped successfully\n", task);
1732
1733                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1734                 atomic_dec(&cmd->t_task_cdbs_left);
1735                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1736                 was_active = true;
1737         }
1738
1739         return was_active;
1740 }
1741
1742 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1743 {
1744         struct se_task *task, *task_tmp;
1745         unsigned long flags;
1746         int ret = 0;
1747
1748         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1749                 cmd->se_tfo->get_task_tag(cmd));
1750
1751         /*
1752          * No tasks remain in the execution queue
1753          */
1754         spin_lock_irqsave(&cmd->t_state_lock, flags);
1755         list_for_each_entry_safe(task, task_tmp,
1756                                 &cmd->t_task_list, t_list) {
1757                 pr_debug("Processing task %p\n", task);
1758                 /*
1759                  * If the struct se_task has not been sent and is not active,
1760                  * remove the struct se_task from the execution queue.
1761                  */
1762                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1763                         spin_unlock_irqrestore(&cmd->t_state_lock,
1764                                         flags);
1765                         transport_remove_task_from_execute_queue(task,
1766                                         cmd->se_dev);
1767
1768                         pr_debug("Task %p removed from execute queue\n", task);
1769                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1770                         continue;
1771                 }
1772
1773                 if (!target_stop_task(task, &flags)) {
1774                         pr_debug("Task %p - did nothing\n", task);
1775                         ret++;
1776                 }
1777         }
1778         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1779
1780         return ret;
1781 }
1782
1783 /*
1784  * Handle SAM-esque emulation for generic transport request failures.
1785  */
1786 static void transport_generic_request_failure(struct se_cmd *cmd)
1787 {
1788         int ret = 0;
1789
1790         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1791                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1792                 cmd->t_task_cdb[0]);
1793         pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1794                 cmd->se_tfo->get_cmd_state(cmd),
1795                 cmd->t_state, cmd->scsi_sense_reason);
1796         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1797                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1798                 " t_transport_active: %d t_transport_stop: %d"
1799                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1800                 atomic_read(&cmd->t_task_cdbs_left),
1801                 atomic_read(&cmd->t_task_cdbs_sent),
1802                 atomic_read(&cmd->t_task_cdbs_ex_left),
1803                 atomic_read(&cmd->t_transport_active),
1804                 atomic_read(&cmd->t_transport_stop),
1805                 atomic_read(&cmd->t_transport_sent));
1806
1807         /*
1808          * For SAM Task Attribute emulation for failed struct se_cmd
1809          */
1810         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1811                 transport_complete_task_attr(cmd);
1812
1813         switch (cmd->scsi_sense_reason) {
1814         case TCM_NON_EXISTENT_LUN:
1815         case TCM_UNSUPPORTED_SCSI_OPCODE:
1816         case TCM_INVALID_CDB_FIELD:
1817         case TCM_INVALID_PARAMETER_LIST:
1818         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1819         case TCM_UNKNOWN_MODE_PAGE:
1820         case TCM_WRITE_PROTECTED:
1821         case TCM_CHECK_CONDITION_ABORT_CMD:
1822         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1823         case TCM_CHECK_CONDITION_NOT_READY:
1824                 break;
1825         case TCM_RESERVATION_CONFLICT:
1826                 /*
1827                  * No SENSE Data payload for this case, set SCSI Status
1828                  * and queue the response to $FABRIC_MOD.
1829                  *
1830                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1831                  */
1832                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1833                 /*
1834                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1835                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1836                  * CONFLICT STATUS.
1837                  *
1838                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1839                  */
1840                 if (cmd->se_sess &&
1841                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1842                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1843                                 cmd->orig_fe_lun, 0x2C,
1844                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1845
1846                 ret = cmd->se_tfo->queue_status(cmd);
1847                 if (ret == -EAGAIN || ret == -ENOMEM)
1848                         goto queue_full;
1849                 goto check_stop;
1850         default:
1851                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1852                         cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1853                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1854                 break;
1855         }
1856         /*
1857          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1858          * make the call to transport_send_check_condition_and_sense()
1859          * directly.  Otherwise expect the fabric to make the call to
1860          * transport_send_check_condition_and_sense() after handling
1861          * possible unsoliticied write data payloads.
1862          */
1863         ret = transport_send_check_condition_and_sense(cmd,
1864                         cmd->scsi_sense_reason, 0);
1865         if (ret == -EAGAIN || ret == -ENOMEM)
1866                 goto queue_full;
1867
1868 check_stop:
1869         transport_lun_remove_cmd(cmd);
1870         if (!transport_cmd_check_stop_to_fabric(cmd))
1871                 ;
1872         return;
1873
1874 queue_full:
1875         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1876         transport_handle_queue_full(cmd, cmd->se_dev);
1877 }
1878
1879 static inline u32 transport_lba_21(unsigned char *cdb)
1880 {
1881         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
1882 }
1883
1884 static inline u32 transport_lba_32(unsigned char *cdb)
1885 {
1886         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1887 }
1888
1889 static inline unsigned long long transport_lba_64(unsigned char *cdb)
1890 {
1891         unsigned int __v1, __v2;
1892
1893         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
1894         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
1895
1896         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1897 }
1898
1899 /*
1900  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
1901  */
1902 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
1903 {
1904         unsigned int __v1, __v2;
1905
1906         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
1907         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
1908
1909         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
1910 }
1911
1912 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
1913 {
1914         unsigned long flags;
1915
1916         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1917         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1918         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1919 }
1920
1921 static inline int transport_tcq_window_closed(struct se_device *dev)
1922 {
1923         if (dev->dev_tcq_window_closed++ <
1924                         PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
1925                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
1926         } else
1927                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
1928
1929         wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
1930         return 0;
1931 }
1932
1933 /*
1934  * Called from Fabric Module context from transport_execute_tasks()
1935  *
1936  * The return of this function determins if the tasks from struct se_cmd
1937  * get added to the execution queue in transport_execute_tasks(),
1938  * or are added to the delayed or ordered lists here.
1939  */
1940 static inline int transport_execute_task_attr(struct se_cmd *cmd)
1941 {
1942         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1943                 return 1;
1944         /*
1945          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1946          * to allow the passed struct se_cmd list of tasks to the front of the list.
1947          */
1948          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1949                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
1950                         " 0x%02x, se_ordered_id: %u\n",
1951                         cmd->t_task_cdb[0],
1952                         cmd->se_ordered_id);
1953                 return 1;
1954         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1955                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
1956                 smp_mb__after_atomic_inc();
1957
1958                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
1959                                 " list, se_ordered_id: %u\n",
1960                                 cmd->t_task_cdb[0],
1961                                 cmd->se_ordered_id);
1962                 /*
1963                  * Add ORDERED command to tail of execution queue if
1964                  * no other older commands exist that need to be
1965                  * completed first.
1966                  */
1967                 if (!atomic_read(&cmd->se_dev->simple_cmds))
1968                         return 1;
1969         } else {
1970                 /*
1971                  * For SIMPLE and UNTAGGED Task Attribute commands
1972                  */
1973                 atomic_inc(&cmd->se_dev->simple_cmds);
1974                 smp_mb__after_atomic_inc();
1975         }
1976         /*
1977          * Otherwise if one or more outstanding ORDERED task attribute exist,
1978          * add the dormant task(s) built for the passed struct se_cmd to the
1979          * execution queue and become in Active state for this struct se_device.
1980          */
1981         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
1982                 /*
1983                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
1984                  * will be drained upon completion of HEAD_OF_QUEUE task.
1985                  */
1986                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
1987                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
1988                 list_add_tail(&cmd->se_delayed_node,
1989                                 &cmd->se_dev->delayed_cmd_list);
1990                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
1991
1992                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1993                         " delayed CMD list, se_ordered_id: %u\n",
1994                         cmd->t_task_cdb[0], cmd->sam_task_attr,
1995                         cmd->se_ordered_id);
1996                 /*
1997                  * Return zero to let transport_execute_tasks() know
1998                  * not to add the delayed tasks to the execution list.
1999                  */
2000                 return 0;
2001         }
2002         /*
2003          * Otherwise, no ORDERED task attributes exist..
2004          */
2005         return 1;
2006 }
2007
2008 /*
2009  * Called from fabric module context in transport_generic_new_cmd() and
2010  * transport_generic_process_write()
2011  */
2012 static int transport_execute_tasks(struct se_cmd *cmd)
2013 {
2014         int add_tasks;
2015
2016         if (se_dev_check_online(cmd->se_dev) != 0) {
2017                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2018                 transport_generic_request_failure(cmd);
2019                 return 0;
2020         }
2021
2022         /*
2023          * Call transport_cmd_check_stop() to see if a fabric exception
2024          * has occurred that prevents execution.
2025          */
2026         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2027                 /*
2028                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2029                  * attribute for the tasks of the received struct se_cmd CDB
2030                  */
2031                 add_tasks = transport_execute_task_attr(cmd);
2032                 if (!add_tasks)
2033                         goto execute_tasks;
2034                 /*
2035                  * This calls transport_add_tasks_from_cmd() to handle
2036                  * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2037                  * (if enabled) in __transport_add_task_to_execute_queue() and
2038                  * transport_add_task_check_sam_attr().
2039                  */
2040                 transport_add_tasks_from_cmd(cmd);
2041         }
2042         /*
2043          * Kick the execution queue for the cmd associated struct se_device
2044          * storage object.
2045          */
2046 execute_tasks:
2047         __transport_execute_tasks(cmd->se_dev);
2048         return 0;
2049 }
2050
2051 /*
2052  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2053  * from struct se_device->execute_task_list and
2054  *
2055  * Called from transport_processing_thread()
2056  */
2057 static int __transport_execute_tasks(struct se_device *dev)
2058 {
2059         int error;
2060         struct se_cmd *cmd = NULL;
2061         struct se_task *task = NULL;
2062         unsigned long flags;
2063
2064         /*
2065          * Check if there is enough room in the device and HBA queue to send
2066          * struct se_tasks to the selected transport.
2067          */
2068 check_depth:
2069         if (!atomic_read(&dev->depth_left))
2070                 return transport_tcq_window_closed(dev);
2071
2072         dev->dev_tcq_window_closed = 0;
2073
2074         spin_lock_irq(&dev->execute_task_lock);
2075         if (list_empty(&dev->execute_task_list)) {
2076                 spin_unlock_irq(&dev->execute_task_lock);
2077                 return 0;
2078         }
2079         task = list_first_entry(&dev->execute_task_list,
2080                                 struct se_task, t_execute_list);
2081         __transport_remove_task_from_execute_queue(task, dev);
2082         spin_unlock_irq(&dev->execute_task_lock);
2083
2084         atomic_dec(&dev->depth_left);
2085
2086         cmd = task->task_se_cmd;
2087
2088         spin_lock_irqsave(&cmd->t_state_lock, flags);
2089         task->task_flags |= (TF_ACTIVE | TF_SENT);
2090         atomic_inc(&cmd->t_task_cdbs_sent);
2091
2092         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2093             cmd->t_task_list_num)
2094                 atomic_set(&cmd->t_transport_sent, 1);
2095
2096         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2097
2098         if (cmd->execute_task)
2099                 error = cmd->execute_task(task);
2100         else
2101                 error = dev->transport->do_task(task);
2102         if (error != 0) {
2103                 spin_lock_irqsave(&cmd->t_state_lock, flags);
2104                 task->task_flags &= ~TF_ACTIVE;
2105                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2106                 atomic_set(&cmd->t_transport_sent, 0);
2107                 transport_stop_tasks_for_cmd(cmd);
2108                 atomic_inc(&dev->depth_left);
2109                 transport_generic_request_failure(cmd);
2110         }
2111
2112         goto check_depth;
2113
2114         return 0;
2115 }
2116
2117 static inline u32 transport_get_sectors_6(
2118         unsigned char *cdb,
2119         struct se_cmd *cmd,
2120         int *ret)
2121 {
2122         struct se_device *dev = cmd->se_dev;
2123
2124         /*
2125          * Assume TYPE_DISK for non struct se_device objects.
2126          * Use 8-bit sector value.
2127          */
2128         if (!dev)
2129                 goto type_disk;
2130
2131         /*
2132          * Use 24-bit allocation length for TYPE_TAPE.
2133          */
2134         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2135                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2136
2137         /*
2138          * Everything else assume TYPE_DISK Sector CDB location.
2139          * Use 8-bit sector value.  SBC-3 says:
2140          *
2141          *   A TRANSFER LENGTH field set to zero specifies that 256
2142          *   logical blocks shall be written.  Any other value
2143          *   specifies the number of logical blocks that shall be
2144          *   written.
2145          */
2146 type_disk:
2147         return cdb[4] ? : 256;
2148 }
2149
2150 static inline u32 transport_get_sectors_10(
2151         unsigned char *cdb,
2152         struct se_cmd *cmd,
2153         int *ret)
2154 {
2155         struct se_device *dev = cmd->se_dev;
2156
2157         /*
2158          * Assume TYPE_DISK for non struct se_device objects.
2159          * Use 16-bit sector value.
2160          */
2161         if (!dev)
2162                 goto type_disk;
2163
2164         /*
2165          * XXX_10 is not defined in SSC, throw an exception
2166          */
2167         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2168                 *ret = -EINVAL;
2169                 return 0;
2170         }
2171
2172         /*
2173          * Everything else assume TYPE_DISK Sector CDB location.
2174          * Use 16-bit sector value.
2175          */
2176 type_disk:
2177         return (u32)(cdb[7] << 8) + cdb[8];
2178 }
2179
2180 static inline u32 transport_get_sectors_12(
2181         unsigned char *cdb,
2182         struct se_cmd *cmd,
2183         int *ret)
2184 {
2185         struct se_device *dev = cmd->se_dev;
2186
2187         /*
2188          * Assume TYPE_DISK for non struct se_device objects.
2189          * Use 32-bit sector value.
2190          */
2191         if (!dev)
2192                 goto type_disk;
2193
2194         /*
2195          * XXX_12 is not defined in SSC, throw an exception
2196          */
2197         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2198                 *ret = -EINVAL;
2199                 return 0;
2200         }
2201
2202         /*
2203          * Everything else assume TYPE_DISK Sector CDB location.
2204          * Use 32-bit sector value.
2205          */
2206 type_disk:
2207         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2208 }
2209
2210 static inline u32 transport_get_sectors_16(
2211         unsigned char *cdb,
2212         struct se_cmd *cmd,
2213         int *ret)
2214 {
2215         struct se_device *dev = cmd->se_dev;
2216
2217         /*
2218          * Assume TYPE_DISK for non struct se_device objects.
2219          * Use 32-bit sector value.
2220          */
2221         if (!dev)
2222                 goto type_disk;
2223
2224         /*
2225          * Use 24-bit allocation length for TYPE_TAPE.
2226          */
2227         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2228                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2229
2230 type_disk:
2231         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2232                     (cdb[12] << 8) + cdb[13];
2233 }
2234
2235 /*
2236  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2237  */
2238 static inline u32 transport_get_sectors_32(
2239         unsigned char *cdb,
2240         struct se_cmd *cmd,
2241         int *ret)
2242 {
2243         /*
2244          * Assume TYPE_DISK for non struct se_device objects.
2245          * Use 32-bit sector value.
2246          */
2247         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2248                     (cdb[30] << 8) + cdb[31];
2249
2250 }
2251
2252 static inline u32 transport_get_size(
2253         u32 sectors,
2254         unsigned char *cdb,
2255         struct se_cmd *cmd)
2256 {
2257         struct se_device *dev = cmd->se_dev;
2258
2259         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2260                 if (cdb[1] & 1) { /* sectors */
2261                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2262                 } else /* bytes */
2263                         return sectors;
2264         }
2265 #if 0
2266         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2267                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2268                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2269                         dev->transport->name);
2270 #endif
2271         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2272 }
2273
2274 static void transport_xor_callback(struct se_cmd *cmd)
2275 {
2276         unsigned char *buf, *addr;
2277         struct scatterlist *sg;
2278         unsigned int offset;
2279         int i;
2280         int count;
2281         /*
2282          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2283          *
2284          * 1) read the specified logical block(s);
2285          * 2) transfer logical blocks from the data-out buffer;
2286          * 3) XOR the logical blocks transferred from the data-out buffer with
2287          *    the logical blocks read, storing the resulting XOR data in a buffer;
2288          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2289          *    blocks transferred from the data-out buffer; and
2290          * 5) transfer the resulting XOR data to the data-in buffer.
2291          */
2292         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2293         if (!buf) {
2294                 pr_err("Unable to allocate xor_callback buf\n");
2295                 return;
2296         }
2297         /*
2298          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2299          * into the locally allocated *buf
2300          */
2301         sg_copy_to_buffer(cmd->t_data_sg,
2302                           cmd->t_data_nents,
2303                           buf,
2304                           cmd->data_length);
2305
2306         /*
2307          * Now perform the XOR against the BIDI read memory located at
2308          * cmd->t_mem_bidi_list
2309          */
2310
2311         offset = 0;
2312         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2313                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2314                 if (!addr)
2315                         goto out;
2316
2317                 for (i = 0; i < sg->length; i++)
2318                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2319
2320                 offset += sg->length;
2321                 kunmap_atomic(addr, KM_USER0);
2322         }
2323
2324 out:
2325         kfree(buf);
2326 }
2327
2328 /*
2329  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2330  */
2331 static int transport_get_sense_data(struct se_cmd *cmd)
2332 {
2333         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2334         struct se_device *dev = cmd->se_dev;
2335         struct se_task *task = NULL, *task_tmp;
2336         unsigned long flags;
2337         u32 offset = 0;
2338
2339         WARN_ON(!cmd->se_lun);
2340
2341         if (!dev)
2342                 return 0;
2343
2344         spin_lock_irqsave(&cmd->t_state_lock, flags);
2345         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2346                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2347                 return 0;
2348         }
2349
2350         list_for_each_entry_safe(task, task_tmp,
2351                                 &cmd->t_task_list, t_list) {
2352                 if (!task->task_sense)
2353                         continue;
2354
2355                 if (!dev->transport->get_sense_buffer) {
2356                         pr_err("dev->transport->get_sense_buffer"
2357                                         " is NULL\n");
2358                         continue;
2359                 }
2360
2361                 sense_buffer = dev->transport->get_sense_buffer(task);
2362                 if (!sense_buffer) {
2363                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2364                                 " sense buffer for task with sense\n",
2365                                 cmd->se_tfo->get_task_tag(cmd), task);
2366                         continue;
2367                 }
2368                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2369
2370                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2371                                 TRANSPORT_SENSE_BUFFER);
2372
2373                 memcpy(&buffer[offset], sense_buffer,
2374                                 TRANSPORT_SENSE_BUFFER);
2375                 cmd->scsi_status = task->task_scsi_status;
2376                 /* Automatically padded */
2377                 cmd->scsi_sense_length =
2378                                 (TRANSPORT_SENSE_BUFFER + offset);
2379
2380                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2381                                 " and sense\n",
2382                         dev->se_hba->hba_id, dev->transport->name,
2383                                 cmd->scsi_status);
2384                 return 0;
2385         }
2386         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2387
2388         return -1;
2389 }
2390
2391 static inline long long transport_dev_end_lba(struct se_device *dev)
2392 {
2393         return dev->transport->get_blocks(dev) + 1;
2394 }
2395
2396 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2397 {
2398         struct se_device *dev = cmd->se_dev;
2399         u32 sectors;
2400
2401         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2402                 return 0;
2403
2404         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2405
2406         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2407                 pr_err("LBA: %llu Sectors: %u exceeds"
2408                         " transport_dev_end_lba(): %llu\n",
2409                         cmd->t_task_lba, sectors,
2410                         transport_dev_end_lba(dev));
2411                 return -EINVAL;
2412         }
2413
2414         return 0;
2415 }
2416
2417 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2418 {
2419         /*
2420          * Determine if the received WRITE_SAME is used to for direct
2421          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2422          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2423          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2424          */
2425         int passthrough = (dev->transport->transport_type ==
2426                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2427
2428         if (!passthrough) {
2429                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2430                         pr_err("WRITE_SAME PBDATA and LBDATA"
2431                                 " bits not supported for Block Discard"
2432                                 " Emulation\n");
2433                         return -ENOSYS;
2434                 }
2435                 /*
2436                  * Currently for the emulated case we only accept
2437                  * tpws with the UNMAP=1 bit set.
2438                  */
2439                 if (!(flags[0] & 0x08)) {
2440                         pr_err("WRITE_SAME w/o UNMAP bit not"
2441                                 " supported for Block Discard Emulation\n");
2442                         return -ENOSYS;
2443                 }
2444         }
2445
2446         return 0;
2447 }
2448
2449 /*      transport_generic_cmd_sequencer():
2450  *
2451  *      Generic Command Sequencer that should work for most DAS transport
2452  *      drivers.
2453  *
2454  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2455  *      RX Thread.
2456  *
2457  *      FIXME: Need to support other SCSI OPCODES where as well.
2458  */
2459 static int transport_generic_cmd_sequencer(
2460         struct se_cmd *cmd,
2461         unsigned char *cdb)
2462 {
2463         struct se_device *dev = cmd->se_dev;
2464         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2465         int ret = 0, sector_ret = 0, passthrough;
2466         u32 sectors = 0, size = 0, pr_reg_type = 0;
2467         u16 service_action;
2468         u8 alua_ascq = 0;
2469         /*
2470          * Check for an existing UNIT ATTENTION condition
2471          */
2472         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2473                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2474                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2475                 return -EINVAL;
2476         }
2477         /*
2478          * Check status of Asymmetric Logical Unit Assignment port
2479          */
2480         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2481         if (ret != 0) {
2482                 /*
2483                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2484                  * The ALUA additional sense code qualifier (ASCQ) is determined
2485                  * by the ALUA primary or secondary access state..
2486                  */
2487                 if (ret > 0) {
2488 #if 0
2489                         pr_debug("[%s]: ALUA TG Port not available,"
2490                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2491                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2492 #endif
2493                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2494                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2495                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2496                         return -EINVAL;
2497                 }
2498                 goto out_invalid_cdb_field;
2499         }
2500         /*
2501          * Check status for SPC-3 Persistent Reservations
2502          */
2503         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2504                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2505                                         cmd, cdb, pr_reg_type) != 0) {
2506                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2507                         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2508                         cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
2509                         return -EBUSY;
2510                 }
2511                 /*
2512                  * This means the CDB is allowed for the SCSI Initiator port
2513                  * when said port is *NOT* holding the legacy SPC-2 or
2514                  * SPC-3 Persistent Reservation.
2515                  */
2516         }
2517
2518         /*
2519          * If we operate in passthrough mode we skip most CDB emulation and
2520          * instead hand the commands down to the physical SCSI device.
2521          */
2522         passthrough =
2523                 (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
2524
2525         switch (cdb[0]) {
2526         case READ_6:
2527                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2528                 if (sector_ret)
2529                         goto out_unsupported_cdb;
2530                 size = transport_get_size(sectors, cdb, cmd);
2531                 cmd->t_task_lba = transport_lba_21(cdb);
2532                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2533                 break;
2534         case READ_10:
2535                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2536                 if (sector_ret)
2537                         goto out_unsupported_cdb;
2538                 size = transport_get_size(sectors, cdb, cmd);
2539                 cmd->t_task_lba = transport_lba_32(cdb);
2540                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2541                 break;
2542         case READ_12:
2543                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2544                 if (sector_ret)
2545                         goto out_unsupported_cdb;
2546                 size = transport_get_size(sectors, cdb, cmd);
2547                 cmd->t_task_lba = transport_lba_32(cdb);
2548                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2549                 break;
2550         case READ_16:
2551                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2552                 if (sector_ret)
2553                         goto out_unsupported_cdb;
2554                 size = transport_get_size(sectors, cdb, cmd);
2555                 cmd->t_task_lba = transport_lba_64(cdb);
2556                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2557                 break;
2558         case WRITE_6:
2559                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2560                 if (sector_ret)
2561                         goto out_unsupported_cdb;
2562                 size = transport_get_size(sectors, cdb, cmd);
2563                 cmd->t_task_lba = transport_lba_21(cdb);
2564                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2565                 break;
2566         case WRITE_10:
2567                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2568                 if (sector_ret)
2569                         goto out_unsupported_cdb;
2570                 size = transport_get_size(sectors, cdb, cmd);
2571                 cmd->t_task_lba = transport_lba_32(cdb);
2572                 if (cdb[1] & 0x8)
2573                         cmd->se_cmd_flags |= SCF_FUA;
2574                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2575                 break;
2576         case WRITE_12:
2577                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2578                 if (sector_ret)
2579                         goto out_unsupported_cdb;
2580                 size = transport_get_size(sectors, cdb, cmd);
2581                 cmd->t_task_lba = transport_lba_32(cdb);
2582                 if (cdb[1] & 0x8)
2583                         cmd->se_cmd_flags |= SCF_FUA;
2584                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2585                 break;
2586         case WRITE_16:
2587                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2588                 if (sector_ret)
2589                         goto out_unsupported_cdb;
2590                 size = transport_get_size(sectors, cdb, cmd);
2591                 cmd->t_task_lba = transport_lba_64(cdb);
2592                 if (cdb[1] & 0x8)
2593                         cmd->se_cmd_flags |= SCF_FUA;
2594                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2595                 break;
2596         case XDWRITEREAD_10:
2597                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2598                     !(cmd->se_cmd_flags & SCF_BIDI))
2599                         goto out_invalid_cdb_field;
2600                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2601                 if (sector_ret)
2602                         goto out_unsupported_cdb;
2603                 size = transport_get_size(sectors, cdb, cmd);
2604                 cmd->t_task_lba = transport_lba_32(cdb);
2605                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2606
2607                 /*
2608                  * Do now allow BIDI commands for passthrough mode.
2609                  */
2610                 if (passthrough)
2611                         goto out_unsupported_cdb;
2612
2613                 /*
2614                  * Setup BIDI XOR callback to be run after I/O completion.
2615                  */
2616                 cmd->transport_complete_callback = &transport_xor_callback;
2617                 if (cdb[1] & 0x8)
2618                         cmd->se_cmd_flags |= SCF_FUA;
2619                 break;
2620         case VARIABLE_LENGTH_CMD:
2621                 service_action = get_unaligned_be16(&cdb[8]);
2622                 switch (service_action) {
2623                 case XDWRITEREAD_32:
2624                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2625                         if (sector_ret)
2626                                 goto out_unsupported_cdb;
2627                         size = transport_get_size(sectors, cdb, cmd);
2628                         /*
2629                          * Use WRITE_32 and READ_32 opcodes for the emulated
2630                          * XDWRITE_READ_32 logic.
2631                          */
2632                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2633                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2634
2635                         /*
2636                          * Do now allow BIDI commands for passthrough mode.
2637                          */
2638                         if (passthrough)
2639                                 goto out_unsupported_cdb;
2640
2641                         /*
2642                          * Setup BIDI XOR callback to be run during after I/O
2643                          * completion.
2644                          */
2645                         cmd->transport_complete_callback = &transport_xor_callback;
2646                         if (cdb[1] & 0x8)
2647                                 cmd->se_cmd_flags |= SCF_FUA;
2648                         break;
2649                 case WRITE_SAME_32:
2650                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2651                         if (sector_ret)
2652                                 goto out_unsupported_cdb;
2653
2654                         if (sectors)
2655                                 size = transport_get_size(1, cdb, cmd);
2656                         else {
2657                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2658                                        " supported\n");
2659                                 goto out_invalid_cdb_field;
2660                         }
2661
2662                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2663                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2664
2665                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2666                                 goto out_invalid_cdb_field;
2667                         if (!passthrough)
2668                                 cmd->execute_task = target_emulate_write_same;
2669                         break;
2670                 default:
2671                         pr_err("VARIABLE_LENGTH_CMD service action"
2672                                 " 0x%04x not supported\n", service_action);
2673                         goto out_unsupported_cdb;
2674                 }
2675                 break;
2676         case MAINTENANCE_IN:
2677                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2678                         /* MAINTENANCE_IN from SCC-2 */
2679                         /*
2680                          * Check for emulated MI_REPORT_TARGET_PGS.
2681                          */
2682                         if (cdb[1] == MI_REPORT_TARGET_PGS &&
2683                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2684                                 cmd->execute_task =
2685                                         target_emulate_report_target_port_groups;
2686                         }
2687                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2688                                (cdb[8] << 8) | cdb[9];
2689                 } else {
2690                         /* GPCMD_SEND_KEY from multi media commands */
2691                         size = (cdb[8] << 8) + cdb[9];
2692                 }
2693                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2694                 break;
2695         case MODE_SELECT:
2696                 size = cdb[4];
2697                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2698                 break;
2699         case MODE_SELECT_10:
2700                 size = (cdb[7] << 8) + cdb[8];
2701                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2702                 break;
2703         case MODE_SENSE:
2704                 size = cdb[4];
2705                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2706                 if (!passthrough)
2707                         cmd->execute_task = target_emulate_modesense;
2708                 break;
2709         case MODE_SENSE_10:
2710                 size = (cdb[7] << 8) + cdb[8];
2711                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2712                 if (!passthrough)
2713                         cmd->execute_task = target_emulate_modesense;
2714                 break;
2715         case GPCMD_READ_BUFFER_CAPACITY:
2716         case GPCMD_SEND_OPC:
2717         case LOG_SELECT:
2718         case LOG_SENSE:
2719                 size = (cdb[7] << 8) + cdb[8];
2720                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2721                 break;
2722         case READ_BLOCK_LIMITS:
2723                 size = READ_BLOCK_LEN;
2724                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2725                 break;
2726         case GPCMD_GET_CONFIGURATION:
2727         case GPCMD_READ_FORMAT_CAPACITIES:
2728         case GPCMD_READ_DISC_INFO:
2729         case GPCMD_READ_TRACK_RZONE_INFO:
2730                 size = (cdb[7] << 8) + cdb[8];
2731                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2732                 break;
2733         case PERSISTENT_RESERVE_IN:
2734                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2735                         cmd->execute_task = target_scsi3_emulate_pr_in;
2736                 size = (cdb[7] << 8) + cdb[8];
2737                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2738                 break;
2739         case PERSISTENT_RESERVE_OUT:
2740                 if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
2741                         cmd->execute_task = target_scsi3_emulate_pr_out;
2742                 size = (cdb[7] << 8) + cdb[8];
2743                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2744                 break;
2745         case GPCMD_MECHANISM_STATUS:
2746         case GPCMD_READ_DVD_STRUCTURE:
2747                 size = (cdb[8] << 8) + cdb[9];
2748                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2749                 break;
2750         case READ_POSITION:
2751                 size = READ_POSITION_LEN;
2752                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2753                 break;
2754         case MAINTENANCE_OUT:
2755                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2756                         /* MAINTENANCE_OUT from SCC-2
2757                          *
2758                          * Check for emulated MO_SET_TARGET_PGS.
2759                          */
2760                         if (cdb[1] == MO_SET_TARGET_PGS &&
2761                             su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
2762                                 cmd->execute_task =
2763                                         target_emulate_set_target_port_groups;
2764                         }
2765
2766                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2767                                (cdb[8] << 8) | cdb[9];
2768                 } else  {
2769                         /* GPCMD_REPORT_KEY from multi media commands */
2770                         size = (cdb[8] << 8) + cdb[9];
2771                 }
2772                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2773                 break;
2774         case INQUIRY:
2775                 size = (cdb[3] << 8) + cdb[4];
2776                 /*
2777                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
2778                  * See spc4r17 section 5.3
2779                  */
2780                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2781                         cmd->sam_task_attr = MSG_HEAD_TAG;
2782                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2783                 if (!passthrough)
2784                         cmd->execute_task = target_emulate_inquiry;
2785                 break;
2786         case READ_BUFFER:
2787                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2788                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2789                 break;
2790         case READ_CAPACITY:
2791                 size = READ_CAP_LEN;
2792                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2793                 if (!passthrough)
2794                         cmd->execute_task = target_emulate_readcapacity;
2795                 break;
2796         case READ_MEDIA_SERIAL_NUMBER:
2797         case SECURITY_PROTOCOL_IN:
2798         case SECURITY_PROTOCOL_OUT:
2799                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2800                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2801                 break;
2802         case SERVICE_ACTION_IN:
2803                 switch (cmd->t_task_cdb[1] & 0x1f) {
2804                 case SAI_READ_CAPACITY_16:
2805                         if (!passthrough)
2806                                 cmd->execute_task =
2807                                         target_emulate_readcapacity_16;
2808                         break;
2809                 default:
2810                         if (passthrough)
2811                                 break;
2812
2813                         pr_err("Unsupported SA: 0x%02x\n",
2814                                 cmd->t_task_cdb[1] & 0x1f);
2815                         goto out_unsupported_cdb;
2816                 }
2817                 /*FALLTHROUGH*/
2818         case ACCESS_CONTROL_IN:
2819         case ACCESS_CONTROL_OUT:
2820         case EXTENDED_COPY:
2821         case READ_ATTRIBUTE:
2822         case RECEIVE_COPY_RESULTS:
2823         case WRITE_ATTRIBUTE:
2824                 size = (cdb[10] << 24) | (cdb[11] << 16) |
2825                        (cdb[12] << 8) | cdb[13];
2826                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2827                 break;
2828         case RECEIVE_DIAGNOSTIC:
2829         case SEND_DIAGNOSTIC:
2830                 size = (cdb[3] << 8) | cdb[4];
2831                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2832                 break;
2833 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
2834 #if 0
2835         case GPCMD_READ_CD:
2836                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2837                 size = (2336 * sectors);
2838                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2839                 break;
2840 #endif
2841         case READ_TOC:
2842                 size = cdb[8];
2843                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2844                 break;
2845         case REQUEST_SENSE:
2846                 size = cdb[4];
2847                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2848                 if (!passthrough)
2849                         cmd->execute_task = target_emulate_request_sense;
2850                 break;
2851         case READ_ELEMENT_STATUS:
2852                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
2853                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2854                 break;
2855         case WRITE_BUFFER:
2856                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
2857                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2858                 break;
2859         case RESERVE:
2860         case RESERVE_10:
2861                 /*
2862                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
2863                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2864                  */
2865                 if (cdb[0] == RESERVE_10)
2866                         size = (cdb[7] << 8) | cdb[8];
2867                 else
2868                         size = cmd->data_length;
2869
2870                 /*
2871                  * Setup the legacy emulated handler for SPC-2 and
2872                  * >= SPC-3 compatible reservation handling (CRH=1)
2873                  * Otherwise, we assume the underlying SCSI logic is
2874                  * is running in SPC_PASSTHROUGH, and wants reservations
2875                  * emulation disabled.
2876                  */
2877                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2878                         cmd->execute_task = target_scsi2_reservation_reserve;
2879                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2880                 break;
2881         case RELEASE:
2882         case RELEASE_10:
2883                 /*
2884                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
2885                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
2886                 */
2887                 if (cdb[0] == RELEASE_10)
2888                         size = (cdb[7] << 8) | cdb[8];
2889                 else
2890                         size = cmd->data_length;
2891
2892                 if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
2893                         cmd->execute_task = target_scsi2_reservation_release;
2894                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2895                 break;
2896         case SYNCHRONIZE_CACHE:
2897         case 0x91: /* SYNCHRONIZE_CACHE_16: */
2898                 /*
2899                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
2900                  */
2901                 if (cdb[0] == SYNCHRONIZE_CACHE) {
2902                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2903                         cmd->t_task_lba = transport_lba_32(cdb);
2904                 } else {
2905                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2906                         cmd->t_task_lba = transport_lba_64(cdb);
2907                 }
2908                 if (sector_ret)
2909                         goto out_unsupported_cdb;
2910
2911                 size = transport_get_size(sectors, cdb, cmd);
2912                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2913
2914                 if (passthrough)
2915                         break;
2916
2917                 /*
2918                  * Check to ensure that LBA + Range does not exceed past end of
2919                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
2920                  */
2921                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
2922                         if (transport_cmd_get_valid_sectors(cmd) < 0)
2923                                 goto out_invalid_cdb_field;
2924                 }
2925                 cmd->execute_task = target_emulate_synchronize_cache;
2926                 break;
2927         case UNMAP:
2928                 size = get_unaligned_be16(&cdb[7]);
2929                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2930                 if (!passthrough)
2931                         cmd->execute_task = target_emulate_unmap;
2932                 break;
2933         case WRITE_SAME_16:
2934                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2935                 if (sector_ret)
2936                         goto out_unsupported_cdb;
2937
2938                 if (sectors)
2939                         size = transport_get_size(1, cdb, cmd);
2940                 else {
2941                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2942                         goto out_invalid_cdb_field;
2943                 }
2944
2945                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
2946                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2947
2948                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2949                         goto out_invalid_cdb_field;
2950                 if (!passthrough)
2951                         cmd->execute_task = target_emulate_write_same;
2952                 break;
2953         case WRITE_SAME:
2954                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2955                 if (sector_ret)
2956                         goto out_unsupported_cdb;
2957
2958                 if (sectors)
2959                         size = transport_get_size(1, cdb, cmd);
2960                 else {
2961                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
2962                         goto out_invalid_cdb_field;
2963                 }
2964
2965                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
2966                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2967                 /*
2968                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
2969                  * of byte 1 bit 3 UNMAP instead of original reserved field
2970                  */
2971                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
2972                         goto out_invalid_cdb_field;
2973                 if (!passthrough)
2974                         cmd->execute_task = target_emulate_write_same;
2975                 break;
2976         case ALLOW_MEDIUM_REMOVAL:
2977         case ERASE:
2978         case REZERO_UNIT:
2979         case SEEK_10:
2980         case SPACE:
2981         case START_STOP:
2982         case TEST_UNIT_READY:
2983         case VERIFY:
2984         case WRITE_FILEMARKS:
2985                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2986                 if (!passthrough)
2987                         cmd->execute_task = target_emulate_noop;
2988                 break;
2989         case GPCMD_CLOSE_TRACK:
2990         case INITIALIZE_ELEMENT_STATUS:
2991         case GPCMD_LOAD_UNLOAD:
2992         case GPCMD_SET_SPEED:
2993         case MOVE_MEDIUM:
2994                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
2995                 break;
2996         case REPORT_LUNS:
2997                 cmd->execute_task = target_report_luns;
2998                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2999                 /*
3000                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3001                  * See spc4r17 section 5.3
3002                  */
3003                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3004                         cmd->sam_task_attr = MSG_HEAD_TAG;
3005                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3006                 break;
3007         default:
3008                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3009                         " 0x%02x, sending CHECK_CONDITION.\n",
3010                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3011                 goto out_unsupported_cdb;
3012         }
3013
3014         if (size != cmd->data_length) {
3015                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3016                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3017                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3018                                 cmd->data_length, size, cdb[0]);
3019
3020                 cmd->cmd_spdtl = size;
3021
3022                 if (cmd->data_direction == DMA_TO_DEVICE) {
3023                         pr_err("Rejecting underflow/overflow"
3024                                         " WRITE data\n");
3025                         goto out_invalid_cdb_field;
3026                 }
3027                 /*
3028                  * Reject READ_* or WRITE_* with overflow/underflow for
3029                  * type SCF_SCSI_DATA_SG_IO_CDB.
3030                  */
3031                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3032                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3033                                 " CDB on non 512-byte sector setup subsystem"
3034                                 " plugin: %s\n", dev->transport->name);
3035                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3036                         goto out_invalid_cdb_field;
3037                 }
3038
3039                 if (size > cmd->data_length) {
3040                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3041                         cmd->residual_count = (size - cmd->data_length);
3042                 } else {
3043                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3044                         cmd->residual_count = (cmd->data_length - size);
3045                 }
3046                 cmd->data_length = size;
3047         }
3048
3049         /* reject any command that we don't have a handler for */
3050         if (!(passthrough || cmd->execute_task ||
3051              (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
3052                 goto out_unsupported_cdb;
3053
3054         /* Let's limit control cdbs to a page, for simplicity's sake. */
3055         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3056             size > PAGE_SIZE)
3057                 goto out_invalid_cdb_field;
3058
3059         transport_set_supported_SAM_opcode(cmd);
3060         return ret;
3061
3062 out_unsupported_cdb:
3063         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3064         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3065         return -EINVAL;
3066 out_invalid_cdb_field:
3067         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3068         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3069         return -EINVAL;
3070 }
3071
3072 /*
3073  * Called from I/O completion to determine which dormant/delayed
3074  * and ordered cmds need to have their tasks added to the execution queue.
3075  */
3076 static void transport_complete_task_attr(struct se_cmd *cmd)
3077 {
3078         struct se_device *dev = cmd->se_dev;
3079         struct se_cmd *cmd_p, *cmd_tmp;
3080         int new_active_tasks = 0;
3081
3082         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3083                 atomic_dec(&dev->simple_cmds);
3084                 smp_mb__after_atomic_dec();
3085                 dev->dev_cur_ordered_id++;
3086                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3087                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3088                         cmd->se_ordered_id);
3089         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3090                 dev->dev_cur_ordered_id++;
3091                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3092                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3093                         cmd->se_ordered_id);
3094         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3095                 atomic_dec(&dev->dev_ordered_sync);
3096                 smp_mb__after_atomic_dec();
3097
3098                 dev->dev_cur_ordered_id++;
3099                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3100                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3101         }
3102         /*
3103          * Process all commands up to the last received
3104          * ORDERED task attribute which requires another blocking
3105          * boundary
3106          */
3107         spin_lock(&dev->delayed_cmd_lock);
3108         list_for_each_entry_safe(cmd_p, cmd_tmp,
3109                         &dev->delayed_cmd_list, se_delayed_node) {
3110
3111                 list_del(&cmd_p->se_delayed_node);
3112                 spin_unlock(&dev->delayed_cmd_lock);
3113
3114                 pr_debug("Calling add_tasks() for"
3115                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3116                         " Dormant -> Active, se_ordered_id: %u\n",
3117                         cmd_p->t_task_cdb[0],
3118                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3119
3120                 transport_add_tasks_from_cmd(cmd_p);
3121                 new_active_tasks++;
3122
3123                 spin_lock(&dev->delayed_cmd_lock);
3124                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3125                         break;
3126         }
3127         spin_unlock(&dev->delayed_cmd_lock);
3128         /*
3129          * If new tasks have become active, wake up the transport thread
3130          * to do the processing of the Active tasks.
3131          */
3132         if (new_active_tasks != 0)
3133                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3134 }
3135
3136 static void transport_complete_qf(struct se_cmd *cmd)
3137 {
3138         int ret = 0;
3139
3140         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3141                 transport_complete_task_attr(cmd);
3142
3143         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3144                 ret = cmd->se_tfo->queue_status(cmd);
3145                 if (ret)
3146                         goto out;
3147         }
3148
3149         switch (cmd->data_direction) {
3150         case DMA_FROM_DEVICE:
3151                 ret = cmd->se_tfo->queue_data_in(cmd);
3152                 break;
3153         case DMA_TO_DEVICE:
3154                 if (cmd->t_bidi_data_sg) {
3155                         ret = cmd->se_tfo->queue_data_in(cmd);
3156                         if (ret < 0)
3157                                 break;
3158                 }
3159                 /* Fall through for DMA_TO_DEVICE */
3160         case DMA_NONE:
3161                 ret = cmd->se_tfo->queue_status(cmd);
3162                 break;
3163         default:
3164                 break;
3165         }
3166
3167 out:
3168         if (ret < 0) {
3169                 transport_handle_queue_full(cmd, cmd->se_dev);
3170                 return;
3171         }
3172         transport_lun_remove_cmd(cmd);
3173         transport_cmd_check_stop_to_fabric(cmd);
3174 }
3175
3176 static void transport_handle_queue_full(
3177         struct se_cmd *cmd,
3178         struct se_device *dev)
3179 {
3180         spin_lock_irq(&dev->qf_cmd_lock);
3181         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3182         atomic_inc(&dev->dev_qf_count);
3183         smp_mb__after_atomic_inc();
3184         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3185
3186         schedule_work(&cmd->se_dev->qf_work_queue);
3187 }
3188
3189 static void target_complete_ok_work(struct work_struct *work)
3190 {
3191         struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3192         int reason = 0, ret;
3193
3194         /*
3195          * Check if we need to move delayed/dormant tasks from cmds on the
3196          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3197          * Attribute.
3198          */
3199         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3200                 transport_complete_task_attr(cmd);
3201         /*
3202          * Check to schedule QUEUE_FULL work, or execute an existing
3203          * cmd->transport_qf_callback()
3204          */
3205         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3206                 schedule_work(&cmd->se_dev->qf_work_queue);
3207
3208         /*
3209          * Check if we need to retrieve a sense buffer from
3210          * the struct se_cmd in question.
3211          */
3212         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3213                 if (transport_get_sense_data(cmd) < 0)
3214                         reason = TCM_NON_EXISTENT_LUN;
3215
3216                 /*
3217                  * Only set when an struct se_task->task_scsi_status returned
3218                  * a non GOOD status.
3219                  */
3220                 if (cmd->scsi_status) {
3221                         ret = transport_send_check_condition_and_sense(
3222                                         cmd, reason, 1);
3223                         if (ret == -EAGAIN || ret == -ENOMEM)
3224                                 goto queue_full;
3225
3226                         transport_lun_remove_cmd(cmd);
3227                         transport_cmd_check_stop_to_fabric(cmd);
3228                         return;
3229                 }
3230         }
3231         /*
3232          * Check for a callback, used by amongst other things
3233          * XDWRITE_READ_10 emulation.
3234          */
3235         if (cmd->transport_complete_callback)
3236                 cmd->transport_complete_callback(cmd);
3237
3238         switch (cmd->data_direction) {
3239         case DMA_FROM_DEVICE:
3240                 spin_lock(&cmd->se_lun->lun_sep_lock);
3241                 if (cmd->se_lun->lun_sep) {
3242                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3243                                         cmd->data_length;
3244                 }
3245                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3246
3247                 ret = cmd->se_tfo->queue_data_in(cmd);
3248                 if (ret == -EAGAIN || ret == -ENOMEM)
3249                         goto queue_full;
3250                 break;
3251         case DMA_TO_DEVICE:
3252                 spin_lock(&cmd->se_lun->lun_sep_lock);
3253                 if (cmd->se_lun->lun_sep) {
3254                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3255                                 cmd->data_length;
3256                 }
3257                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3258                 /*
3259                  * Check if we need to send READ payload for BIDI-COMMAND
3260                  */
3261                 if (cmd->t_bidi_data_sg) {
3262                         spin_lock(&cmd->se_lun->lun_sep_lock);
3263                         if (cmd->se_lun->lun_sep) {
3264                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3265                                         cmd->data_length;
3266                         }
3267                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3268                         ret = cmd->se_tfo->queue_data_in(cmd);
3269                         if (ret == -EAGAIN || ret == -ENOMEM)
3270                                 goto queue_full;
3271                         break;
3272                 }
3273                 /* Fall through for DMA_TO_DEVICE */
3274         case DMA_NONE:
3275                 ret = cmd->se_tfo->queue_status(cmd);
3276                 if (ret == -EAGAIN || ret == -ENOMEM)
3277                         goto queue_full;
3278                 break;
3279         default:
3280                 break;
3281         }
3282
3283         transport_lun_remove_cmd(cmd);
3284         transport_cmd_check_stop_to_fabric(cmd);
3285         return;
3286
3287 queue_full:
3288         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3289                 " data_direction: %d\n", cmd, cmd->data_direction);
3290         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3291         transport_handle_queue_full(cmd, cmd->se_dev);
3292 }
3293
3294 static void transport_free_dev_tasks(struct se_cmd *cmd)
3295 {
3296         struct se_task *task, *task_tmp;
3297         unsigned long flags;
3298         LIST_HEAD(dispose_list);
3299
3300         spin_lock_irqsave(&cmd->t_state_lock, flags);
3301         list_for_each_entry_safe(task, task_tmp,
3302                                 &cmd->t_task_list, t_list) {
3303                 if (!(task->task_flags & TF_ACTIVE))
3304                         list_move_tail(&task->t_list, &dispose_list);
3305         }
3306         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3307
3308         while (!list_empty(&dispose_list)) {
3309                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3310
3311                 if (task->task_sg != cmd->t_data_sg &&
3312                     task->task_sg != cmd->t_bidi_data_sg)
3313                         kfree(task->task_sg);
3314
3315                 list_del(&task->t_list);
3316
3317                 cmd->se_dev->transport->free_task(task);
3318         }
3319 }
3320
3321 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3322 {
3323         struct scatterlist *sg;
3324         int count;
3325
3326         for_each_sg(sgl, sg, nents, count)
3327                 __free_page(sg_page(sg));
3328
3329         kfree(sgl);
3330 }
3331
3332 static inline void transport_free_pages(struct se_cmd *cmd)
3333 {
3334         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3335                 return;
3336
3337         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3338         cmd->t_data_sg = NULL;
3339         cmd->t_data_nents = 0;
3340
3341         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3342         cmd->t_bidi_data_sg = NULL;
3343         cmd->t_bidi_data_nents = 0;
3344 }
3345
3346 /**
3347  * transport_release_cmd - free a command
3348  * @cmd:       command to free
3349  *
3350  * This routine unconditionally frees a command, and reference counting
3351  * or list removal must be done in the caller.
3352  */
3353 static void transport_release_cmd(struct se_cmd *cmd)
3354 {
3355         BUG_ON(!cmd->se_tfo);
3356
3357         if (cmd->se_tmr_req)
3358                 core_tmr_release_req(cmd->se_tmr_req);
3359         if (cmd->t_task_cdb != cmd->__t_task_cdb)
3360                 kfree(cmd->t_task_cdb);
3361         /*
3362          * Check if target_wait_for_sess_cmds() is expecting to
3363          * release se_cmd directly here..
3364          */
3365         if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
3366                 if (cmd->se_tfo->check_release_cmd(cmd) != 0)
3367                         return;
3368
3369         cmd->se_tfo->release_cmd(cmd);
3370 }
3371
3372 /**
3373  * transport_put_cmd - release a reference to a command
3374  * @cmd:       command to release
3375  *
3376  * This routine releases our reference to the command and frees it if possible.
3377  */
3378 static void transport_put_cmd(struct se_cmd *cmd)
3379 {
3380         unsigned long flags;
3381         int free_tasks = 0;
3382
3383         spin_lock_irqsave(&cmd->t_state_lock, flags);
3384         if (atomic_read(&cmd->t_fe_count)) {
3385                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3386                         goto out_busy;
3387         }
3388
3389         if (atomic_read(&cmd->t_se_count)) {
3390                 if (!atomic_dec_and_test(&cmd->t_se_count))
3391                         goto out_busy;
3392         }
3393
3394         if (atomic_read(&cmd->transport_dev_active)) {
3395                 atomic_set(&cmd->transport_dev_active, 0);
3396                 transport_all_task_dev_remove_state(cmd);
3397                 free_tasks = 1;
3398         }
3399         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3400
3401         if (free_tasks != 0)
3402                 transport_free_dev_tasks(cmd);
3403
3404         transport_free_pages(cmd);
3405         transport_release_cmd(cmd);
3406         return;
3407 out_busy:
3408         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3409 }
3410
3411 /*
3412  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3413  * allocating in the core.
3414  * @cmd:  Associated se_cmd descriptor
3415  * @mem:  SGL style memory for TCM WRITE / READ
3416  * @sg_mem_num: Number of SGL elements
3417  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3418  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3419  *
3420  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3421  * of parameters.
3422  */
3423 int transport_generic_map_mem_to_cmd(
3424         struct se_cmd *cmd,
3425         struct scatterlist *sgl,
3426         u32 sgl_count,
3427         struct scatterlist *sgl_bidi,
3428         u32 sgl_bidi_count)
3429 {
3430         if (!sgl || !sgl_count)
3431                 return 0;
3432
3433         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3434             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3435                 /*
3436                  * Reject SCSI data overflow with map_mem_to_cmd() as incoming
3437                  * scatterlists already have been set to follow what the fabric
3438                  * passes for the original expected data transfer length.
3439                  */
3440                 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
3441                         pr_warn("Rejecting SCSI DATA overflow for fabric using"
3442                                 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
3443                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3444                         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3445                         return -EINVAL;
3446                 }
3447
3448                 cmd->t_data_sg = sgl;
3449                 cmd->t_data_nents = sgl_count;
3450
3451                 if (sgl_bidi && sgl_bidi_count) {
3452                         cmd->t_bidi_data_sg = sgl_bidi;
3453                         cmd->t_bidi_data_nents = sgl_bidi_count;
3454                 }
3455                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3456         }
3457
3458         return 0;
3459 }
3460 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3461
3462 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3463 {
3464         struct scatterlist *sg = cmd->t_data_sg;
3465
3466         BUG_ON(!sg);
3467         /*
3468          * We need to take into account a possible offset here for fabrics like
3469          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3470          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3471          */
3472         return kmap(sg_page(sg)) + sg->offset;
3473 }
3474 EXPORT_SYMBOL(transport_kmap_first_data_page);
3475
3476 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3477 {
3478         kunmap(sg_page(cmd->t_data_sg));
3479 }
3480 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3481
3482 static int
3483 transport_generic_get_mem(struct se_cmd *cmd)
3484 {
3485         u32 length = cmd->data_length;
3486         unsigned int nents;
3487         struct page *page;
3488         int i = 0;
3489
3490         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3491         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3492         if (!cmd->t_data_sg)
3493                 return -ENOMEM;
3494
3495         cmd->t_data_nents = nents;
3496         sg_init_table(cmd->t_data_sg, nents);
3497
3498         while (length) {
3499                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3500                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3501                 if (!page)
3502                         goto out;
3503
3504                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3505                 length -= page_len;
3506                 i++;
3507         }
3508         return 0;
3509
3510 out:
3511         while (i >= 0) {
3512                 __free_page(sg_page(&cmd->t_data_sg[i]));
3513                 i--;
3514         }
3515         kfree(cmd->t_data_sg);
3516         cmd->t_data_sg = NULL;
3517         return -ENOMEM;
3518 }
3519
3520 /* Reduce sectors if they are too long for the device */
3521 static inline sector_t transport_limit_task_sectors(
3522         struct se_device *dev,
3523         unsigned long long lba,
3524         sector_t sectors)
3525 {
3526         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3527
3528         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3529                 if ((lba + sectors) > transport_dev_end_lba(dev))
3530                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3531
3532         return sectors;
3533 }
3534
3535
3536 /*
3537  * This function can be used by HW target mode drivers to create a linked
3538  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3539  * This is intended to be called during the completion path by TCM Core
3540  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3541  */
3542 void transport_do_task_sg_chain(struct se_cmd *cmd)
3543 {
3544         struct scatterlist *sg_first = NULL;
3545         struct scatterlist *sg_prev = NULL;
3546         int sg_prev_nents = 0;
3547         struct scatterlist *sg;
3548         struct se_task *task;
3549         u32 chained_nents = 0;
3550         int i;
3551
3552         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3553
3554         /*
3555          * Walk the struct se_task list and setup scatterlist chains
3556          * for each contiguously allocated struct se_task->task_sg[].
3557          */
3558         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3559                 if (!task->task_sg)
3560                         continue;
3561
3562                 if (!sg_first) {
3563                         sg_first = task->task_sg;
3564                         chained_nents = task->task_sg_nents;
3565                 } else {
3566                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3567                         chained_nents += task->task_sg_nents;
3568                 }
3569                 /*
3570                  * For the padded tasks, use the extra SGL vector allocated
3571                  * in transport_allocate_data_tasks() for the sg_prev_nents
3572                  * offset into sg_chain() above.
3573                  *
3574                  * We do not need the padding for the last task (or a single
3575                  * task), but in that case we will never use the sg_prev_nents
3576                  * value below which would be incorrect.
3577                  */
3578                 sg_prev_nents = (task->task_sg_nents + 1);
3579                 sg_prev = task->task_sg;
3580         }
3581         /*
3582          * Setup the starting pointer and total t_tasks_sg_linked_no including
3583          * padding SGs for linking and to mark the end.
3584          */
3585         cmd->t_tasks_sg_chained = sg_first;
3586         cmd->t_tasks_sg_chained_no = chained_nents;
3587
3588         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3589                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3590                 cmd->t_tasks_sg_chained_no);
3591
3592         for_each_sg(cmd->t_tasks_sg_chained, sg,
3593                         cmd->t_tasks_sg_chained_no, i) {
3594
3595                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3596                         i, sg, sg_page(sg), sg->length, sg->offset);
3597                 if (sg_is_chain(sg))
3598                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3599                 if (sg_is_last(sg))
3600                         pr_debug("SG: %p sg_is_last=1\n", sg);
3601         }
3602 }
3603 EXPORT_SYMBOL(transport_do_task_sg_chain);
3604
3605 /*
3606  * Break up cmd into chunks transport can handle
3607  */
3608 static int
3609 transport_allocate_data_tasks(struct se_cmd *cmd,
3610         enum dma_data_direction data_direction,
3611         struct scatterlist *cmd_sg, unsigned int sgl_nents)
3612 {
3613         struct se_device *dev = cmd->se_dev;
3614         int task_count, i;
3615         unsigned long long lba;
3616         sector_t sectors, dev_max_sectors;
3617         u32 sector_size;
3618
3619         if (transport_cmd_get_valid_sectors(cmd) < 0)
3620                 return -EINVAL;
3621
3622         dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3623         sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3624
3625         WARN_ON(cmd->data_length % sector_size);
3626
3627         lba = cmd->t_task_lba;
3628         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3629         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3630
3631         /*
3632          * If we need just a single task reuse the SG list in the command
3633          * and avoid a lot of work.
3634          */
3635         if (task_count == 1) {
3636                 struct se_task *task;
3637                 unsigned long flags;
3638
3639                 task = transport_generic_get_task(cmd, data_direction);
3640                 if (!task)
3641                         return -ENOMEM;
3642
3643                 task->task_sg = cmd_sg;
3644                 task->task_sg_nents = sgl_nents;
3645
3646                 task->task_lba = lba;
3647                 task->task_sectors = sectors;
3648                 task->task_size = task->task_sectors * sector_size;
3649
3650                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3651                 list_add_tail(&task->t_list, &cmd->t_task_list);
3652                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3653
3654                 return task_count;
3655         }
3656
3657         for (i = 0; i < task_count; i++) {
3658                 struct se_task *task;
3659                 unsigned int task_size, task_sg_nents_padded;
3660                 struct scatterlist *sg;
3661                 unsigned long flags;
3662                 int count;
3663
3664                 task = transport_generic_get_task(cmd, data_direction);
3665                 if (!task)
3666                         return -ENOMEM;
3667
3668                 task->task_lba = lba;
3669                 task->task_sectors = min(sectors, dev_max_sectors);
3670                 task->task_size = task->task_sectors * sector_size;
3671
3672                 /*
3673                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3674                  * in order to calculate the number per task SGL entries
3675                  */
3676                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3677                 /*
3678                  * Check if the fabric module driver is requesting that all
3679                  * struct se_task->task_sg[] be chained together..  If so,
3680                  * then allocate an extra padding SG entry for linking and
3681                  * marking the end of the chained SGL for every task except
3682                  * the last one for (task_count > 1) operation, or skipping
3683                  * the extra padding for the (task_count == 1) case.
3684                  */
3685                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3686                         task_sg_nents_padded = (task->task_sg_nents + 1);
3687                 } else
3688                         task_sg_nents_padded = task->task_sg_nents;
3689
3690                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3691                                         task_sg_nents_padded, GFP_KERNEL);
3692                 if (!task->task_sg) {
3693                         cmd->se_dev->transport->free_task(task);
3694                         return -ENOMEM;
3695                 }
3696
3697                 sg_init_table(task->task_sg, task_sg_nents_padded);
3698
3699                 task_size = task->task_size;
3700
3701                 /* Build new sgl, only up to task_size */
3702                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3703                         if (cmd_sg->length > task_size)
3704                                 break;
3705
3706                         *sg = *cmd_sg;
3707                         task_size -= cmd_sg->length;
3708                         cmd_sg = sg_next(cmd_sg);
3709                 }
3710
3711                 lba += task->task_sectors;
3712                 sectors -= task->task_sectors;
3713
3714                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3715                 list_add_tail(&task->t_list, &cmd->t_task_list);
3716                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3717         }
3718
3719         return task_count;
3720 }
3721
3722 static int
3723 transport_allocate_control_task(struct se_cmd *cmd)
3724 {
3725         struct se_task *task;
3726         unsigned long flags;
3727
3728         task = transport_generic_get_task(cmd, cmd->data_direction);
3729         if (!task)
3730                 return -ENOMEM;
3731
3732         task->task_sg = cmd->t_data_sg;
3733         task->task_size = cmd->data_length;
3734         task->task_sg_nents = cmd->t_data_nents;
3735
3736         spin_lock_irqsave(&cmd->t_state_lock, flags);
3737         list_add_tail(&task->t_list, &cmd->t_task_list);
3738         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3739
3740         /* Success! Return number of tasks allocated */
3741         return 1;
3742 }
3743
3744 /*
3745  * Allocate any required ressources to execute the command, and either place
3746  * it on the execution queue if possible.  For writes we might not have the
3747  * payload yet, thus notify the fabric via a call to ->write_pending instead.
3748  */
3749 int transport_generic_new_cmd(struct se_cmd *cmd)
3750 {
3751         struct se_device *dev = cmd->se_dev;
3752         int task_cdbs, task_cdbs_bidi = 0;
3753         int set_counts = 1;
3754         int ret = 0;
3755
3756         /*
3757          * Determine is the TCM fabric module has already allocated physical
3758          * memory, and is directly calling transport_generic_map_mem_to_cmd()
3759          * beforehand.
3760          */
3761         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
3762             cmd->data_length) {
3763                 ret = transport_generic_get_mem(cmd);
3764                 if (ret < 0)
3765                         goto out_fail;
3766         }
3767
3768         /*
3769          * For BIDI command set up the read tasks first.
3770          */
3771         if (cmd->t_bidi_data_sg &&
3772             dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
3773                 BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
3774
3775                 task_cdbs_bidi = transport_allocate_data_tasks(cmd,
3776                                 DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
3777                                 cmd->t_bidi_data_nents);
3778                 if (task_cdbs_bidi <= 0)
3779                         goto out_fail;
3780
3781                 atomic_inc(&cmd->t_fe_count);
3782                 atomic_inc(&cmd->t_se_count);
3783                 set_counts = 0;
3784         }
3785
3786         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
3787                 task_cdbs = transport_allocate_data_tasks(cmd,
3788                                         cmd->data_direction, cmd->t_data_sg,
3789                                         cmd->t_data_nents);
3790         } else {
3791                 task_cdbs = transport_allocate_control_task(cmd);
3792         }
3793
3794         if (task_cdbs < 0)
3795                 goto out_fail;
3796         else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
3797                 cmd->t_state = TRANSPORT_COMPLETE;
3798                 atomic_set(&cmd->t_transport_active, 1);
3799                 INIT_WORK(&cmd->work, target_complete_ok_work);
3800                 queue_work(target_completion_wq, &cmd->work);
3801                 return 0;
3802         }
3803
3804         if (set_counts) {
3805                 atomic_inc(&cmd->t_fe_count);
3806                 atomic_inc(&cmd->t_se_count);
3807         }
3808
3809         cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
3810         atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
3811         atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
3812
3813         /*
3814          * For WRITEs, let the fabric know its buffer is ready..
3815          * This WRITE struct se_cmd (and all of its associated struct se_task's)
3816          * will be added to the struct se_device execution queue after its WRITE
3817          * data has arrived. (ie: It gets handled by the transport processing
3818          * thread a second time)
3819          */
3820         if (cmd->data_direction == DMA_TO_DEVICE) {
3821                 transport_add_tasks_to_state_queue(cmd);
3822                 return transport_generic_write_pending(cmd);
3823         }
3824         /*
3825          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
3826          * to the execution queue.
3827          */
3828         transport_execute_tasks(cmd);
3829         return 0;
3830
3831 out_fail:
3832         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3833         cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3834         return -EINVAL;
3835 }
3836 EXPORT_SYMBOL(transport_generic_new_cmd);
3837
3838 /*      transport_generic_process_write():
3839  *
3840  *
3841  */
3842 void transport_generic_process_write(struct se_cmd *cmd)
3843 {
3844         transport_execute_tasks(cmd);
3845 }
3846 EXPORT_SYMBOL(transport_generic_process_write);
3847
3848 static void transport_write_pending_qf(struct se_cmd *cmd)
3849 {
3850         int ret;
3851
3852         ret = cmd->se_tfo->write_pending(cmd);
3853         if (ret == -EAGAIN || ret == -ENOMEM) {
3854                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
3855                          cmd);
3856                 transport_handle_queue_full(cmd, cmd->se_dev);
3857         }
3858 }
3859
3860 static int transport_generic_write_pending(struct se_cmd *cmd)
3861 {
3862         unsigned long flags;
3863         int ret;
3864
3865         spin_lock_irqsave(&cmd->t_state_lock, flags);
3866         cmd->t_state = TRANSPORT_WRITE_PENDING;
3867         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3868
3869         /*
3870          * Clear the se_cmd for WRITE_PENDING status in order to set
3871          * cmd->t_transport_active=0 so that transport_generic_handle_data
3872          * can be called from HW target mode interrupt code.  This is safe
3873          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
3874          * because the se_cmd->se_lun pointer is not being cleared.
3875          */
3876         transport_cmd_check_stop(cmd, 1, 0);
3877
3878         /*
3879          * Call the fabric write_pending function here to let the
3880          * frontend know that WRITE buffers are ready.
3881          */
3882         ret = cmd->se_tfo->write_pending(cmd);
3883         if (ret == -EAGAIN || ret == -ENOMEM)
3884                 goto queue_full;
3885         else if (ret < 0)
3886                 return ret;
3887
3888         return 1;
3889
3890 queue_full:
3891         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
3892         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
3893         transport_handle_queue_full(cmd, cmd->se_dev);
3894         return 0;
3895 }
3896
3897 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
3898 {
3899         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
3900                 if (wait_for_tasks && cmd->se_tmr_req)
3901                          transport_wait_for_tasks(cmd);
3902
3903                 transport_release_cmd(cmd);
3904         } else {
3905                 if (wait_for_tasks)
3906                         transport_wait_for_tasks(cmd);
3907
3908                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
3909
3910                 if (cmd->se_lun)
3911                         transport_lun_remove_cmd(cmd);
3912
3913                 transport_free_dev_tasks(cmd);
3914
3915                 transport_put_cmd(cmd);
3916         }
3917 }
3918 EXPORT_SYMBOL(transport_generic_free_cmd);
3919
3920 /* target_get_sess_cmd - Add command to active ->sess_cmd_list
3921  * @se_sess:    session to reference
3922  * @se_cmd:     command descriptor to add
3923  */
3924 void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3925 {
3926         unsigned long flags;
3927
3928         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3929         list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
3930         se_cmd->check_release = 1;
3931         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3932 }
3933 EXPORT_SYMBOL(target_get_sess_cmd);
3934
3935 /* target_put_sess_cmd - Check for active I/O shutdown or list delete
3936  * @se_sess:    session to reference
3937  * @se_cmd:     command descriptor to drop
3938  */
3939 int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
3940 {
3941         unsigned long flags;
3942
3943         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3944         if (list_empty(&se_cmd->se_cmd_list)) {
3945                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3946                 WARN_ON(1);
3947                 return 0;
3948         }
3949
3950         if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
3951                 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3952                 complete(&se_cmd->cmd_wait_comp);
3953                 return 1;
3954         }
3955         list_del(&se_cmd->se_cmd_list);
3956         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3957
3958         return 0;
3959 }
3960 EXPORT_SYMBOL(target_put_sess_cmd);
3961
3962 /* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
3963  * @se_sess:    session to split
3964  */
3965 void target_splice_sess_cmd_list(struct se_session *se_sess)
3966 {
3967         struct se_cmd *se_cmd;
3968         unsigned long flags;
3969
3970         WARN_ON(!list_empty(&se_sess->sess_wait_list));
3971         INIT_LIST_HEAD(&se_sess->sess_wait_list);
3972
3973         spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
3974         se_sess->sess_tearing_down = 1;
3975
3976         list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
3977
3978         list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
3979                 se_cmd->cmd_wait_set = 1;
3980
3981         spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
3982 }
3983 EXPORT_SYMBOL(target_splice_sess_cmd_list);
3984
3985 /* target_wait_for_sess_cmds - Wait for outstanding descriptors
3986  * @se_sess:    session to wait for active I/O
3987  * @wait_for_tasks:     Make extra transport_wait_for_tasks call
3988  */
3989 void target_wait_for_sess_cmds(
3990         struct se_session *se_sess,
3991         int wait_for_tasks)
3992 {
3993         struct se_cmd *se_cmd, *tmp_cmd;
3994         bool rc = false;
3995
3996         list_for_each_entry_safe(se_cmd, tmp_cmd,
3997                                 &se_sess->sess_wait_list, se_cmd_list) {
3998                 list_del(&se_cmd->se_cmd_list);
3999
4000                 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
4001                         " %d\n", se_cmd, se_cmd->t_state,
4002                         se_cmd->se_tfo->get_cmd_state(se_cmd));
4003
4004                 if (wait_for_tasks) {
4005                         pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
4006                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4007                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4008
4009                         rc = transport_wait_for_tasks(se_cmd);
4010
4011                         pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
4012                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4013                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4014                 }
4015
4016                 if (!rc) {
4017                         wait_for_completion(&se_cmd->cmd_wait_comp);
4018                         pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
4019                                 " fabric state: %d\n", se_cmd, se_cmd->t_state,
4020                                 se_cmd->se_tfo->get_cmd_state(se_cmd));
4021                 }
4022
4023                 se_cmd->se_tfo->release_cmd(se_cmd);
4024         }
4025 }
4026 EXPORT_SYMBOL(target_wait_for_sess_cmds);
4027
4028 /*      transport_lun_wait_for_tasks():
4029  *
4030  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4031  *      an struct se_lun to be successfully shutdown.
4032  */
4033 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4034 {
4035         unsigned long flags;
4036         int ret;
4037         /*
4038          * If the frontend has already requested this struct se_cmd to
4039          * be stopped, we can safely ignore this struct se_cmd.
4040          */
4041         spin_lock_irqsave(&cmd->t_state_lock, flags);
4042         if (atomic_read(&cmd->t_transport_stop)) {
4043                 atomic_set(&cmd->transport_lun_stop, 0);
4044                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4045                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4046                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4047                 transport_cmd_check_stop(cmd, 1, 0);
4048                 return -EPERM;
4049         }
4050         atomic_set(&cmd->transport_lun_fe_stop, 1);
4051         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4052
4053         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4054
4055         ret = transport_stop_tasks_for_cmd(cmd);
4056
4057         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4058                         " %d\n", cmd, cmd->t_task_list_num, ret);
4059         if (!ret) {
4060                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4061                                 cmd->se_tfo->get_task_tag(cmd));
4062                 wait_for_completion(&cmd->transport_lun_stop_comp);
4063                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4064                                 cmd->se_tfo->get_task_tag(cmd));
4065         }
4066         transport_remove_cmd_from_queue(cmd);
4067
4068         return 0;
4069 }
4070
4071 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4072 {
4073         struct se_cmd *cmd = NULL;
4074         unsigned long lun_flags, cmd_flags;
4075         /*
4076          * Do exception processing and return CHECK_CONDITION status to the
4077          * Initiator Port.
4078          */
4079         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4080         while (!list_empty(&lun->lun_cmd_list)) {
4081                 cmd = list_first_entry(&lun->lun_cmd_list,
4082                        struct se_cmd, se_lun_node);
4083                 list_del(&cmd->se_lun_node);
4084
4085                 atomic_set(&cmd->transport_lun_active, 0);
4086                 /*
4087                  * This will notify iscsi_target_transport.c:
4088                  * transport_cmd_check_stop() that a LUN shutdown is in
4089                  * progress for the iscsi_cmd_t.
4090                  */
4091                 spin_lock(&cmd->t_state_lock);
4092                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4093                         "_lun_stop for  ITT: 0x%08x\n",
4094                         cmd->se_lun->unpacked_lun,
4095                         cmd->se_tfo->get_task_tag(cmd));
4096                 atomic_set(&cmd->transport_lun_stop, 1);
4097                 spin_unlock(&cmd->t_state_lock);
4098
4099                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4100
4101                 if (!cmd->se_lun) {
4102                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4103                                 cmd->se_tfo->get_task_tag(cmd),
4104                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4105                         BUG();
4106                 }
4107                 /*
4108                  * If the Storage engine still owns the iscsi_cmd_t, determine
4109                  * and/or stop its context.
4110                  */
4111                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4112                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4113                         cmd->se_tfo->get_task_tag(cmd));
4114
4115                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4116                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4117                         continue;
4118                 }
4119
4120                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4121                         "_wait_for_tasks(): SUCCESS\n",
4122                         cmd->se_lun->unpacked_lun,
4123                         cmd->se_tfo->get_task_tag(cmd));
4124
4125                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4126                 if (!atomic_read(&cmd->transport_dev_active)) {
4127                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4128                         goto check_cond;
4129                 }
4130                 atomic_set(&cmd->transport_dev_active, 0);
4131                 transport_all_task_dev_remove_state(cmd);
4132                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4133
4134                 transport_free_dev_tasks(cmd);
4135                 /*
4136                  * The Storage engine stopped this struct se_cmd before it was
4137                  * send to the fabric frontend for delivery back to the
4138                  * Initiator Node.  Return this SCSI CDB back with an
4139                  * CHECK_CONDITION status.
4140                  */
4141 check_cond:
4142                 transport_send_check_condition_and_sense(cmd,
4143                                 TCM_NON_EXISTENT_LUN, 0);
4144                 /*
4145                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4146                  * be released, notify the waiting thread now that LU has
4147                  * finished accessing it.
4148                  */
4149                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4150                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4151                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4152                                 " struct se_cmd: %p ITT: 0x%08x\n",
4153                                 lun->unpacked_lun,
4154                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4155
4156                         spin_unlock_irqrestore(&cmd->t_state_lock,
4157                                         cmd_flags);
4158                         transport_cmd_check_stop(cmd, 1, 0);
4159                         complete(&cmd->transport_lun_fe_stop_comp);
4160                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4161                         continue;
4162                 }
4163                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4164                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4165
4166                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4167                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4168         }
4169         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4170 }
4171
4172 static int transport_clear_lun_thread(void *p)
4173 {
4174         struct se_lun *lun = (struct se_lun *)p;
4175
4176         __transport_clear_lun_from_sessions(lun);
4177         complete(&lun->lun_shutdown_comp);
4178
4179         return 0;
4180 }
4181
4182 int transport_clear_lun_from_sessions(struct se_lun *lun)
4183 {
4184         struct task_struct *kt;
4185
4186         kt = kthread_run(transport_clear_lun_thread, lun,
4187                         "tcm_cl_%u", lun->unpacked_lun);
4188         if (IS_ERR(kt)) {
4189                 pr_err("Unable to start clear_lun thread\n");
4190                 return PTR_ERR(kt);
4191         }
4192         wait_for_completion(&lun->lun_shutdown_comp);
4193
4194         return 0;
4195 }
4196
4197 /**
4198  * transport_wait_for_tasks - wait for completion to occur
4199  * @cmd:        command to wait
4200  *
4201  * Called from frontend fabric context to wait for storage engine
4202  * to pause and/or release frontend generated struct se_cmd.
4203  */
4204 bool transport_wait_for_tasks(struct se_cmd *cmd)
4205 {
4206         unsigned long flags;
4207
4208         spin_lock_irqsave(&cmd->t_state_lock, flags);
4209         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4210                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4211                 return false;
4212         }
4213         /*
4214          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4215          * has been set in transport_set_supported_SAM_opcode().
4216          */
4217         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4218                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4219                 return false;
4220         }
4221         /*
4222          * If we are already stopped due to an external event (ie: LUN shutdown)
4223          * sleep until the connection can have the passed struct se_cmd back.
4224          * The cmd->transport_lun_stopped_sem will be upped by
4225          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4226          * has completed its operation on the struct se_cmd.
4227          */
4228         if (atomic_read(&cmd->transport_lun_stop)) {
4229
4230                 pr_debug("wait_for_tasks: Stopping"
4231                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4232                         "_stop_comp); for ITT: 0x%08x\n",
4233                         cmd->se_tfo->get_task_tag(cmd));
4234                 /*
4235                  * There is a special case for WRITES where a FE exception +
4236                  * LUN shutdown means ConfigFS context is still sleeping on
4237                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4238                  * We go ahead and up transport_lun_stop_comp just to be sure
4239                  * here.
4240                  */
4241                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4242                 complete(&cmd->transport_lun_stop_comp);
4243                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4244                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4245
4246                 transport_all_task_dev_remove_state(cmd);
4247                 /*
4248                  * At this point, the frontend who was the originator of this
4249                  * struct se_cmd, now owns the structure and can be released through
4250                  * normal means below.
4251                  */
4252                 pr_debug("wait_for_tasks: Stopped"
4253                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4254                         "stop_comp); for ITT: 0x%08x\n",
4255                         cmd->se_tfo->get_task_tag(cmd));
4256
4257                 atomic_set(&cmd->transport_lun_stop, 0);
4258         }
4259         if (!atomic_read(&cmd->t_transport_active) ||
4260              atomic_read(&cmd->t_transport_aborted)) {
4261                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4262                 return false;
4263         }
4264
4265         atomic_set(&cmd->t_transport_stop, 1);
4266
4267         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4268                 " i_state: %d, t_state: %d, t_transport_stop = TRUE\n",
4269                 cmd, cmd->se_tfo->get_task_tag(cmd),
4270                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4271
4272         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4273
4274         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4275
4276         wait_for_completion(&cmd->t_transport_stop_comp);
4277
4278         spin_lock_irqsave(&cmd->t_state_lock, flags);
4279         atomic_set(&cmd->t_transport_active, 0);
4280         atomic_set(&cmd->t_transport_stop, 0);
4281
4282         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4283                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4284                 cmd->se_tfo->get_task_tag(cmd));
4285
4286         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4287
4288         return true;
4289 }
4290 EXPORT_SYMBOL(transport_wait_for_tasks);
4291
4292 static int transport_get_sense_codes(
4293         struct se_cmd *cmd,
4294         u8 *asc,
4295         u8 *ascq)
4296 {
4297         *asc = cmd->scsi_asc;
4298         *ascq = cmd->scsi_ascq;
4299
4300         return 0;
4301 }
4302
4303 static int transport_set_sense_codes(
4304         struct se_cmd *cmd,
4305         u8 asc,
4306         u8 ascq)
4307 {
4308         cmd->scsi_asc = asc;
4309         cmd->scsi_ascq = ascq;
4310
4311         return 0;
4312 }
4313
4314 int transport_send_check_condition_and_sense(
4315         struct se_cmd *cmd,
4316         u8 reason,
4317         int from_transport)
4318 {
4319         unsigned char *buffer = cmd->sense_buffer;
4320         unsigned long flags;
4321         int offset;
4322         u8 asc = 0, ascq = 0;
4323
4324         spin_lock_irqsave(&cmd->t_state_lock, flags);
4325         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4326                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4327                 return 0;
4328         }
4329         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4330         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4331
4332         if (!reason && from_transport)
4333                 goto after_reason;
4334
4335         if (!from_transport)
4336                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4337         /*
4338          * Data Segment and SenseLength of the fabric response PDU.
4339          *
4340          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4341          * from include/scsi/scsi_cmnd.h
4342          */
4343         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4344                                 TRANSPORT_SENSE_BUFFER);
4345         /*
4346          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4347          * SENSE KEY values from include/scsi/scsi.h
4348          */
4349         switch (reason) {
4350         case TCM_NON_EXISTENT_LUN:
4351                 /* CURRENT ERROR */
4352                 buffer[offset] = 0x70;
4353                 /* ILLEGAL REQUEST */
4354                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4355                 /* LOGICAL UNIT NOT SUPPORTED */
4356                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4357                 break;
4358         case TCM_UNSUPPORTED_SCSI_OPCODE:
4359         case TCM_SECTOR_COUNT_TOO_MANY:
4360                 /* CURRENT ERROR */
4361                 buffer[offset] = 0x70;
4362                 /* ILLEGAL REQUEST */
4363                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4364                 /* INVALID COMMAND OPERATION CODE */
4365                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4366                 break;
4367         case TCM_UNKNOWN_MODE_PAGE:
4368                 /* CURRENT ERROR */
4369                 buffer[offset] = 0x70;
4370                 /* ILLEGAL REQUEST */
4371                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4372                 /* INVALID FIELD IN CDB */
4373                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4374                 break;
4375         case TCM_CHECK_CONDITION_ABORT_CMD:
4376                 /* CURRENT ERROR */
4377                 buffer[offset] = 0x70;
4378                 /* ABORTED COMMAND */
4379                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4380                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4381                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4382                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4383                 break;
4384         case TCM_INCORRECT_AMOUNT_OF_DATA:
4385                 /* CURRENT ERROR */
4386                 buffer[offset] = 0x70;
4387                 /* ABORTED COMMAND */
4388                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4389                 /* WRITE ERROR */
4390                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4391                 /* NOT ENOUGH UNSOLICITED DATA */
4392                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4393                 break;
4394         case TCM_INVALID_CDB_FIELD:
4395                 /* CURRENT ERROR */
4396                 buffer[offset] = 0x70;
4397                 /* ABORTED COMMAND */
4398                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4399                 /* INVALID FIELD IN CDB */
4400                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4401                 break;
4402         case TCM_INVALID_PARAMETER_LIST:
4403                 /* CURRENT ERROR */
4404                 buffer[offset] = 0x70;
4405                 /* ABORTED COMMAND */
4406                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4407                 /* INVALID FIELD IN PARAMETER LIST */
4408                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4409                 break;
4410         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4411                 /* CURRENT ERROR */
4412                 buffer[offset] = 0x70;
4413                 /* ABORTED COMMAND */
4414                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4415                 /* WRITE ERROR */
4416                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4417                 /* UNEXPECTED_UNSOLICITED_DATA */
4418                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4419                 break;
4420         case TCM_SERVICE_CRC_ERROR:
4421                 /* CURRENT ERROR */
4422                 buffer[offset] = 0x70;
4423                 /* ABORTED COMMAND */
4424                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4425                 /* PROTOCOL SERVICE CRC ERROR */
4426                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4427                 /* N/A */
4428                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4429                 break;
4430         case TCM_SNACK_REJECTED:
4431                 /* CURRENT ERROR */
4432                 buffer[offset] = 0x70;
4433                 /* ABORTED COMMAND */
4434                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4435                 /* READ ERROR */
4436                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4437                 /* FAILED RETRANSMISSION REQUEST */
4438                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4439                 break;
4440         case TCM_WRITE_PROTECTED:
4441                 /* CURRENT ERROR */
4442                 buffer[offset] = 0x70;
4443                 /* DATA PROTECT */
4444                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4445                 /* WRITE PROTECTED */
4446                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4447                 break;
4448         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4449                 /* CURRENT ERROR */
4450                 buffer[offset] = 0x70;
4451                 /* UNIT ATTENTION */
4452                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4453                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4454                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4455                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4456                 break;
4457         case TCM_CHECK_CONDITION_NOT_READY:
4458                 /* CURRENT ERROR */
4459                 buffer[offset] = 0x70;
4460                 /* Not Ready */
4461                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4462                 transport_get_sense_codes(cmd, &asc, &ascq);
4463                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4464                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4465                 break;
4466         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4467         default:
4468                 /* CURRENT ERROR */
4469                 buffer[offset] = 0x70;
4470                 /* ILLEGAL REQUEST */
4471                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4472                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4473                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4474                 break;
4475         }
4476         /*
4477          * This code uses linux/include/scsi/scsi.h SAM status codes!
4478          */
4479         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4480         /*
4481          * Automatically padded, this value is encoded in the fabric's
4482          * data_length response PDU containing the SCSI defined sense data.
4483          */
4484         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4485
4486 after_reason:
4487         return cmd->se_tfo->queue_status(cmd);
4488 }
4489 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4490
4491 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4492 {
4493         int ret = 0;
4494
4495         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4496                 if (!send_status ||
4497                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4498                         return 1;
4499 #if 0
4500                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4501                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4502                         cmd->t_task_cdb[0],
4503                         cmd->se_tfo->get_task_tag(cmd));
4504 #endif
4505                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4506                 cmd->se_tfo->queue_status(cmd);
4507                 ret = 1;
4508         }
4509         return ret;
4510 }
4511 EXPORT_SYMBOL(transport_check_aborted_status);
4512
4513 void transport_send_task_abort(struct se_cmd *cmd)
4514 {
4515         unsigned long flags;
4516
4517         spin_lock_irqsave(&cmd->t_state_lock, flags);
4518         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4519                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4520                 return;
4521         }
4522         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4523
4524         /*
4525          * If there are still expected incoming fabric WRITEs, we wait
4526          * until until they have completed before sending a TASK_ABORTED
4527          * response.  This response with TASK_ABORTED status will be
4528          * queued back to fabric module by transport_check_aborted_status().
4529          */
4530         if (cmd->data_direction == DMA_TO_DEVICE) {
4531                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4532                         atomic_inc(&cmd->t_transport_aborted);
4533                         smp_mb__after_atomic_inc();
4534                 }
4535         }
4536         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4537 #if 0
4538         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4539                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4540                 cmd->se_tfo->get_task_tag(cmd));
4541 #endif
4542         cmd->se_tfo->queue_status(cmd);
4543 }
4544
4545 static int transport_generic_do_tmr(struct se_cmd *cmd)
4546 {
4547         struct se_device *dev = cmd->se_dev;
4548         struct se_tmr_req *tmr = cmd->se_tmr_req;
4549         int ret;
4550
4551         switch (tmr->function) {
4552         case TMR_ABORT_TASK:
4553                 tmr->response = TMR_FUNCTION_REJECTED;
4554                 break;
4555         case TMR_ABORT_TASK_SET:
4556         case TMR_CLEAR_ACA:
4557         case TMR_CLEAR_TASK_SET:
4558                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4559                 break;
4560         case TMR_LUN_RESET:
4561                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4562                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4563                                          TMR_FUNCTION_REJECTED;
4564                 break;
4565         case TMR_TARGET_WARM_RESET:
4566                 tmr->response = TMR_FUNCTION_REJECTED;
4567                 break;
4568         case TMR_TARGET_COLD_RESET:
4569                 tmr->response = TMR_FUNCTION_REJECTED;
4570                 break;
4571         default:
4572                 pr_err("Uknown TMR function: 0x%02x.\n",
4573                                 tmr->function);
4574                 tmr->response = TMR_FUNCTION_REJECTED;
4575                 break;
4576         }
4577
4578         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4579         cmd->se_tfo->queue_tm_rsp(cmd);
4580
4581         transport_cmd_check_stop_to_fabric(cmd);
4582         return 0;
4583 }
4584
4585 /*      transport_processing_thread():
4586  *
4587  *
4588  */
4589 static int transport_processing_thread(void *param)
4590 {
4591         int ret;
4592         struct se_cmd *cmd;
4593         struct se_device *dev = (struct se_device *) param;
4594
4595         while (!kthread_should_stop()) {
4596                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4597                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4598                                 kthread_should_stop());
4599                 if (ret < 0)
4600                         goto out;
4601
4602 get_cmd:
4603                 __transport_execute_tasks(dev);
4604
4605                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4606                 if (!cmd)
4607                         continue;
4608
4609                 switch (cmd->t_state) {
4610                 case TRANSPORT_NEW_CMD:
4611                         BUG();
4612                         break;
4613                 case TRANSPORT_NEW_CMD_MAP:
4614                         if (!cmd->se_tfo->new_cmd_map) {
4615                                 pr_err("cmd->se_tfo->new_cmd_map is"
4616                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4617                                 BUG();
4618                         }
4619                         ret = cmd->se_tfo->new_cmd_map(cmd);
4620                         if (ret < 0) {
4621                                 transport_generic_request_failure(cmd);
4622                                 break;
4623                         }
4624                         ret = transport_generic_new_cmd(cmd);
4625                         if (ret < 0) {
4626                                 transport_generic_request_failure(cmd);
4627                                 break;
4628                         }
4629                         break;
4630                 case TRANSPORT_PROCESS_WRITE:
4631                         transport_generic_process_write(cmd);
4632                         break;
4633                 case TRANSPORT_PROCESS_TMR:
4634                         transport_generic_do_tmr(cmd);
4635                         break;
4636                 case TRANSPORT_COMPLETE_QF_WP:
4637                         transport_write_pending_qf(cmd);
4638                         break;
4639                 case TRANSPORT_COMPLETE_QF_OK:
4640                         transport_complete_qf(cmd);
4641                         break;
4642                 default:
4643                         pr_err("Unknown t_state: %d  for ITT: 0x%08x "
4644                                 "i_state: %d on SE LUN: %u\n",
4645                                 cmd->t_state,
4646                                 cmd->se_tfo->get_task_tag(cmd),
4647                                 cmd->se_tfo->get_cmd_state(cmd),
4648                                 cmd->se_lun->unpacked_lun);
4649                         BUG();
4650                 }
4651
4652                 goto get_cmd;
4653         }
4654
4655 out:
4656         WARN_ON(!list_empty(&dev->state_task_list));
4657         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4658         dev->process_thread = NULL;
4659         return 0;
4660 }