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 <asm/unaligned.h>
  40 #include <net/sock.h>
  41 #include <net/tcp.h>
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_cmnd.h>
  44 #include <scsi/scsi_tcq.h>
  45
  46 #include <target/target_core_base.h>
  47 #include <target/target_core_device.h>
  48 #include <target/target_core_tmr.h>
  49 #include <target/target_core_tpg.h>
  50 #include <target/target_core_transport.h>
  51 #include <target/target_core_fabric_ops.h>
  52 #include <target/target_core_configfs.h>
  53
  54 #include "target_core_alua.h"
  55 #include "target_core_hba.h"
  56 #include "target_core_pr.h"
  57 #include "target_core_ua.h"
  58
  59 static int sub_api_initialized;
  60
  61 static struct kmem_cache *se_cmd_cache;
  62 static struct kmem_cache *se_sess_cache;
  63 struct kmem_cache *se_tmr_req_cache;
  64 struct kmem_cache *se_ua_cache;
  65 struct kmem_cache *t10_pr_reg_cache;
  66 struct kmem_cache *t10_alua_lu_gp_cache;
  67 struct kmem_cache *t10_alua_lu_gp_mem_cache;
  68 struct kmem_cache *t10_alua_tg_pt_gp_cache;
  69 struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  70
  71 static int transport_generic_write_pending(struct se_cmd *);
  72 static int transport_processing_thread(void *param);
  73 static int __transport_execute_tasks(struct se_device *dev);
  74 static void transport_complete_task_attr(struct se_cmd *cmd);
  75 static void transport_handle_queue_full(struct se_cmd *cmd,
  76                 struct se_device *dev);
  77 static void transport_direct_request_timeout(struct se_cmd *cmd);
  78 static void transport_free_dev_tasks(struct se_cmd *cmd);
  79 static u32 transport_allocate_tasks(struct se_cmd *cmd,
  80                 unsigned long long starting_lba,
  81                 enum dma_data_direction data_direction,
  82                 struct scatterlist *sgl, unsigned int nents);
  83 static int transport_generic_get_mem(struct se_cmd *cmd);
  84 static void transport_put_cmd(struct se_cmd *cmd);
  85 static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
  86 static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  87
  88 int init_se_kmem_caches(void)
  89 {
  90         se_cmd_cache = kmem_cache_create("se_cmd_cache",
  91                         sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
  92         if (!se_cmd_cache) {
  93                 pr_err("kmem_cache_create for struct se_cmd failed\n");
  94                 goto out;
  95         }
  96         se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
  97                         sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
  98                         0, NULL);
  99         if (!se_tmr_req_cache) {
 100                 pr_err("kmem_cache_create() for struct se_tmr_req"
 101                                 " failed\n");
 102                 goto out;
 103         }
 104         se_sess_cache = kmem_cache_create("se_sess_cache",
 105                         sizeof(struct se_session), __alignof__(struct se_session),
 106                         0, NULL);
 107         if (!se_sess_cache) {
 108                 pr_err("kmem_cache_create() for struct se_session"
 109                                 " failed\n");
 110                 goto out;
 111         }
 112         se_ua_cache = kmem_cache_create("se_ua_cache",
 113                         sizeof(struct se_ua), __alignof__(struct se_ua),
 114                         0, NULL);
 115         if (!se_ua_cache) {
 116                 pr_err("kmem_cache_create() for struct se_ua failed\n");
 117                 goto out;
 118         }
 119         t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
 120                         sizeof(struct t10_pr_registration),
 121                         __alignof__(struct t10_pr_registration), 0, NULL);
 122         if (!t10_pr_reg_cache) {
 123                 pr_err("kmem_cache_create() for struct t10_pr_registration"
 124                                 " failed\n");
 125                 goto out;
 126         }
 127         t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 128                         sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 129                         0, NULL);
 130         if (!t10_alua_lu_gp_cache) {
 131                 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 132                                 " failed\n");
 133                 goto out;
 134         }
 135         t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 136                         sizeof(struct t10_alua_lu_gp_member),
 137                         __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 138         if (!t10_alua_lu_gp_mem_cache) {
 139                 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 140                                 "cache failed\n");
 141                 goto out;
 142         }
 143         t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 144                         sizeof(struct t10_alua_tg_pt_gp),
 145                         __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 146         if (!t10_alua_tg_pt_gp_cache) {
 147                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 148                                 "cache failed\n");
 149                 goto out;
 150         }
 151         t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 152                         "t10_alua_tg_pt_gp_mem_cache",
 153                         sizeof(struct t10_alua_tg_pt_gp_member),
 154                         __alignof__(struct t10_alua_tg_pt_gp_member),
 155                         0, NULL);
 156         if (!t10_alua_tg_pt_gp_mem_cache) {
 157                 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 158                                 "mem_t failed\n");
 159                 goto out;
 160         }
 161
 162         return 0;
 163 out:
 164         if (se_cmd_cache)
 165                 kmem_cache_destroy(se_cmd_cache);
 166         if (se_tmr_req_cache)
 167                 kmem_cache_destroy(se_tmr_req_cache);
 168         if (se_sess_cache)
 169                 kmem_cache_destroy(se_sess_cache);
 170         if (se_ua_cache)
 171                 kmem_cache_destroy(se_ua_cache);
 172         if (t10_pr_reg_cache)
 173                 kmem_cache_destroy(t10_pr_reg_cache);
 174         if (t10_alua_lu_gp_cache)
 175                 kmem_cache_destroy(t10_alua_lu_gp_cache);
 176         if (t10_alua_lu_gp_mem_cache)
 177                 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 178         if (t10_alua_tg_pt_gp_cache)
 179                 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 180         if (t10_alua_tg_pt_gp_mem_cache)
 181                 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 182         return -ENOMEM;
 183 }
 184
 185 void release_se_kmem_caches(void)
 186 {
 187         kmem_cache_destroy(se_cmd_cache);
 188         kmem_cache_destroy(se_tmr_req_cache);
 189         kmem_cache_destroy(se_sess_cache);
 190         kmem_cache_destroy(se_ua_cache);
 191         kmem_cache_destroy(t10_pr_reg_cache);
 192         kmem_cache_destroy(t10_alua_lu_gp_cache);
 193         kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 194         kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 195         kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 196 }
 197
 198 /* This code ensures unique mib indexes are handed out. */
 199 static DEFINE_SPINLOCK(scsi_mib_index_lock);
 200 static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 201
 202 /*
 203  * Allocate a new row index for the entry type specified
 204  */
 205 u32 scsi_get_new_index(scsi_index_t type)
 206 {
 207         u32 new_index;
 208
 209         BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 210
 211         spin_lock(&scsi_mib_index_lock);
 212         new_index = ++scsi_mib_index[type];
 213         spin_unlock(&scsi_mib_index_lock);
 214
 215         return new_index;
 216 }
 217
 218 void transport_init_queue_obj(struct se_queue_obj *qobj)
 219 {
 220         atomic_set(&qobj->queue_cnt, 0);
 221         INIT_LIST_HEAD(&qobj->qobj_list);
 222         init_waitqueue_head(&qobj->thread_wq);
 223         spin_lock_init(&qobj->cmd_queue_lock);
 224 }
 225 EXPORT_SYMBOL(transport_init_queue_obj);
 226
 227 static int transport_subsystem_reqmods(void)
 228 {
 229         int ret;
 230
 231         ret = request_module("target_core_iblock");
 232         if (ret != 0)
 233                 pr_err("Unable to load target_core_iblock\n");
 234
 235         ret = request_module("target_core_file");
 236         if (ret != 0)
 237                 pr_err("Unable to load target_core_file\n");
 238
 239         ret = request_module("target_core_pscsi");
 240         if (ret != 0)
 241                 pr_err("Unable to load target_core_pscsi\n");
 242
 243         ret = request_module("target_core_stgt");
 244         if (ret != 0)
 245                 pr_err("Unable to load target_core_stgt\n");
 246
 247         return 0;
 248 }
 249
 250 int transport_subsystem_check_init(void)
 251 {
 252         int ret;
 253
 254         if (sub_api_initialized)
 255                 return 0;
 256         /*
 257          * Request the loading of known TCM subsystem plugins..
 258          */
 259         ret = transport_subsystem_reqmods();
 260         if (ret < 0)
 261                 return ret;
 262
 263         sub_api_initialized = 1;
 264         return 0;
 265 }
 266
 267 struct se_session *transport_init_session(void)
 268 {
 269         struct se_session *se_sess;
 270
 271         se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 272         if (!se_sess) {
 273                 pr_err("Unable to allocate struct se_session from"
 274                                 " se_sess_cache\n");
 275                 return ERR_PTR(-ENOMEM);
 276         }
 277         INIT_LIST_HEAD(&se_sess->sess_list);
 278         INIT_LIST_HEAD(&se_sess->sess_acl_list);
 279
 280         return se_sess;
 281 }
 282 EXPORT_SYMBOL(transport_init_session);
 283
 284 /*
 285  * Called with spin_lock_bh(&struct se_portal_group->session_lock called.
 286  */
 287 void __transport_register_session(
 288         struct se_portal_group *se_tpg,
 289         struct se_node_acl *se_nacl,
 290         struct se_session *se_sess,
 291         void *fabric_sess_ptr)
 292 {
 293         unsigned char buf[PR_REG_ISID_LEN];
 294
 295         se_sess->se_tpg = se_tpg;
 296         se_sess->fabric_sess_ptr = fabric_sess_ptr;
 297         /*
 298          * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 299          *
 300          * Only set for struct se_session's that will actually be moving I/O.
 301          * eg: *NOT* discovery sessions.
 302          */
 303         if (se_nacl) {
 304                 /*
 305                  * If the fabric module supports an ISID based TransportID,
 306                  * save this value in binary from the fabric I_T Nexus now.
 307                  */
 308                 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 309                         memset(&buf[0], 0, PR_REG_ISID_LEN);
 310                         se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 311                                         &buf[0], PR_REG_ISID_LEN);
 312                         se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 313                 }
 314                 spin_lock_irq(&se_nacl->nacl_sess_lock);
 315                 /*
 316                  * The se_nacl->nacl_sess pointer will be set to the
 317                  * last active I_T Nexus for each struct se_node_acl.
 318                  */
 319                 se_nacl->nacl_sess = se_sess;
 320
 321                 list_add_tail(&se_sess->sess_acl_list,
 322                               &se_nacl->acl_sess_list);
 323                 spin_unlock_irq(&se_nacl->nacl_sess_lock);
 324         }
 325         list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 326
 327         pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 328                 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 329 }
 330 EXPORT_SYMBOL(__transport_register_session);
 331
 332 void transport_register_session(
 333         struct se_portal_group *se_tpg,
 334         struct se_node_acl *se_nacl,
 335         struct se_session *se_sess,
 336         void *fabric_sess_ptr)
 337 {
 338         spin_lock_bh(&se_tpg->session_lock);
 339         __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 340         spin_unlock_bh(&se_tpg->session_lock);
 341 }
 342 EXPORT_SYMBOL(transport_register_session);
 343
 344 void transport_deregister_session_configfs(struct se_session *se_sess)
 345 {
 346         struct se_node_acl *se_nacl;
 347         unsigned long flags;
 348         /*
 349          * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 350          */
 351         se_nacl = se_sess->se_node_acl;
 352         if (se_nacl) {
 353                 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 354                 list_del(&se_sess->sess_acl_list);
 355                 /*
 356                  * If the session list is empty, then clear the pointer.
 357                  * Otherwise, set the struct se_session pointer from the tail
 358                  * element of the per struct se_node_acl active session list.
 359                  */
 360                 if (list_empty(&se_nacl->acl_sess_list))
 361                         se_nacl->nacl_sess = NULL;
 362                 else {
 363                         se_nacl->nacl_sess = container_of(
 364                                         se_nacl->acl_sess_list.prev,
 365                                         struct se_session, sess_acl_list);
 366                 }
 367                 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 368         }
 369 }
 370 EXPORT_SYMBOL(transport_deregister_session_configfs);
 371
 372 void transport_free_session(struct se_session *se_sess)
 373 {
 374         kmem_cache_free(se_sess_cache, se_sess);
 375 }
 376 EXPORT_SYMBOL(transport_free_session);
 377
 378 void transport_deregister_session(struct se_session *se_sess)
 379 {
 380         struct se_portal_group *se_tpg = se_sess->se_tpg;
 381         struct se_node_acl *se_nacl;
 382         unsigned long flags;
 383
 384         if (!se_tpg) {
 385                 transport_free_session(se_sess);
 386                 return;
 387         }
 388
 389         spin_lock_irqsave(&se_tpg->session_lock, flags);
 390         list_del(&se_sess->sess_list);
 391         se_sess->se_tpg = NULL;
 392         se_sess->fabric_sess_ptr = NULL;
 393         spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 394
 395         /*
 396          * Determine if we need to do extra work for this initiator node's
 397          * struct se_node_acl if it had been previously dynamically generated.
 398          */
 399         se_nacl = se_sess->se_node_acl;
 400         if (se_nacl) {
 401                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 402                 if (se_nacl->dynamic_node_acl) {
 403                         if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
 404                                         se_tpg)) {
 405                                 list_del(&se_nacl->acl_list);
 406                                 se_tpg->num_node_acls--;
 407                                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 408
 409                                 core_tpg_wait_for_nacl_pr_ref(se_nacl);
 410                                 core_free_device_list_for_node(se_nacl, se_tpg);
 411                                 se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
 412                                                 se_nacl);
 413                                 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 414                         }
 415                 }
 416                 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 417         }
 418
 419         transport_free_session(se_sess);
 420
 421         pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 422                 se_tpg->se_tpg_tfo->get_fabric_name());
 423 }
 424 EXPORT_SYMBOL(transport_deregister_session);
 425
 426 /*
 427  * Called with cmd->t_state_lock held.
 428  */
 429 static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
 430 {
 431         struct se_device *dev = cmd->se_dev;
 432         struct se_task *task;
 433         unsigned long flags;
 434
 435         if (!dev)
 436                 return;
 437
 438         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 439                 if (task->task_flags & TF_ACTIVE)
 440                         continue;
 441
 442                 if (!atomic_read(&task->task_state_active))
 443                         continue;
 444
 445                 spin_lock_irqsave(&dev->execute_task_lock, flags);
 446                 list_del(&task->t_state_list);
 447                 pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
 448                         cmd->se_tfo->get_task_tag(cmd), dev, task);
 449                 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 450
 451                 atomic_set(&task->task_state_active, 0);
 452                 atomic_dec(&cmd->t_task_cdbs_ex_left);
 453         }
 454 }
 455
 456 /*      transport_cmd_check_stop():
 457  *
 458  *      'transport_off = 1' determines if t_transport_active should be cleared.
 459  *      'transport_off = 2' determines if task_dev_state should be removed.
 460  *
 461  *      A non-zero u8 t_state sets cmd->t_state.
 462  *      Returns 1 when command is stopped, else 0.
 463  */
 464 static int transport_cmd_check_stop(
 465         struct se_cmd *cmd,
 466         int transport_off,
 467         u8 t_state)
 468 {
 469         unsigned long flags;
 470
 471         spin_lock_irqsave(&cmd->t_state_lock, flags);
 472         /*
 473          * Determine if IOCTL context caller in requesting the stopping of this
 474          * command for LUN shutdown purposes.
 475          */
 476         if (atomic_read(&cmd->transport_lun_stop)) {
 477                 pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
 478                         " == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 479                         cmd->se_tfo->get_task_tag(cmd));
 480
 481                 cmd->deferred_t_state = cmd->t_state;
 482                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
 483                 atomic_set(&cmd->t_transport_active, 0);
 484                 if (transport_off == 2)
 485                         transport_all_task_dev_remove_state(cmd);
 486                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 487
 488                 complete(&cmd->transport_lun_stop_comp);
 489                 return 1;
 490         }
 491         /*
 492          * Determine if frontend context caller is requesting the stopping of
 493          * this command for frontend exceptions.
 494          */
 495         if (atomic_read(&cmd->t_transport_stop)) {
 496                 pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
 497                         " TRUE for ITT: 0x%08x\n", __func__, __LINE__,
 498                         cmd->se_tfo->get_task_tag(cmd));
 499
 500                 cmd->deferred_t_state = cmd->t_state;
 501                 cmd->t_state = TRANSPORT_DEFERRED_CMD;
 502                 if (transport_off == 2)
 503                         transport_all_task_dev_remove_state(cmd);
 504
 505                 /*
 506                  * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
 507                  * to FE.
 508                  */
 509                 if (transport_off == 2)
 510                         cmd->se_lun = NULL;
 511                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 512
 513                 complete(&cmd->t_transport_stop_comp);
 514                 return 1;
 515         }
 516         if (transport_off) {
 517                 atomic_set(&cmd->t_transport_active, 0);
 518                 if (transport_off == 2) {
 519                         transport_all_task_dev_remove_state(cmd);
 520                         /*
 521                          * Clear struct se_cmd->se_lun before the transport_off == 2
 522                          * handoff to fabric module.
 523                          */
 524                         cmd->se_lun = NULL;
 525                         /*
 526                          * Some fabric modules like tcm_loop can release
 527                          * their internally allocated I/O reference now and
 528                          * struct se_cmd now.
 529                          */
 530                         if (cmd->se_tfo->check_stop_free != NULL) {
 531                                 spin_unlock_irqrestore(
 532                                         &cmd->t_state_lock, flags);
 533
 534                                 cmd->se_tfo->check_stop_free(cmd);
 535                                 return 1;
 536                         }
 537                 }
 538                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 539
 540                 return 0;
 541         } else if (t_state)
 542                 cmd->t_state = t_state;
 543         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 544
 545         return 0;
 546 }
 547
 548 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 549 {
 550         return transport_cmd_check_stop(cmd, 2, 0);
 551 }
 552
 553 static void transport_lun_remove_cmd(struct se_cmd *cmd)
 554 {
 555         struct se_lun *lun = cmd->se_lun;
 556         unsigned long flags;
 557
 558         if (!lun)
 559                 return;
 560
 561         spin_lock_irqsave(&cmd->t_state_lock, flags);
 562         if (!atomic_read(&cmd->transport_dev_active)) {
 563                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 564                 goto check_lun;
 565         }
 566         atomic_set(&cmd->transport_dev_active, 0);
 567         transport_all_task_dev_remove_state(cmd);
 568         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 569
 570
 571 check_lun:
 572         spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 573         if (atomic_read(&cmd->transport_lun_active)) {
 574                 list_del(&cmd->se_lun_node);
 575                 atomic_set(&cmd->transport_lun_active, 0);
 576 #if 0
 577                 pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
 578                         cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
 579 #endif
 580         }
 581         spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 582 }
 583
 584 void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 585 {
 586         if (!cmd->se_tmr_req)
 587                 transport_lun_remove_cmd(cmd);
 588
 589         if (transport_cmd_check_stop_to_fabric(cmd))
 590                 return;
 591         if (remove) {
 592                 transport_remove_cmd_from_queue(cmd);
 593                 transport_put_cmd(cmd);
 594         }
 595 }
 596
 597 static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
 598                 bool at_head)
 599 {
 600         struct se_device *dev = cmd->se_dev;
 601         struct se_queue_obj *qobj = &dev->dev_queue_obj;
 602         unsigned long flags;
 603
 604         if (t_state) {
 605                 spin_lock_irqsave(&cmd->t_state_lock, flags);
 606                 cmd->t_state = t_state;
 607                 atomic_set(&cmd->t_transport_active, 1);
 608                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 609         }
 610
 611         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 612
 613         /* If the cmd is already on the list, remove it before we add it */
 614         if (!list_empty(&cmd->se_queue_node))
 615                 list_del(&cmd->se_queue_node);
 616         else
 617                 atomic_inc(&qobj->queue_cnt);
 618
 619         if (at_head)
 620                 list_add(&cmd->se_queue_node, &qobj->qobj_list);
 621         else
 622                 list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
 623         atomic_set(&cmd->t_transport_queue_active, 1);
 624         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 625
 626         wake_up_interruptible(&qobj->thread_wq);
 627 }
 628
 629 static struct se_cmd *
 630 transport_get_cmd_from_queue(struct se_queue_obj *qobj)
 631 {
 632         struct se_cmd *cmd;
 633         unsigned long flags;
 634
 635         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 636         if (list_empty(&qobj->qobj_list)) {
 637                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 638                 return NULL;
 639         }
 640         cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
 641
 642         atomic_set(&cmd->t_transport_queue_active, 0);
 643
 644         list_del_init(&cmd->se_queue_node);
 645         atomic_dec(&qobj->queue_cnt);
 646         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 647
 648         return cmd;
 649 }
 650
 651 static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
 652 {
 653         struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
 654         unsigned long flags;
 655
 656         spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 657         if (!atomic_read(&cmd->t_transport_queue_active)) {
 658                 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 659                 return;
 660         }
 661         atomic_set(&cmd->t_transport_queue_active, 0);
 662         atomic_dec(&qobj->queue_cnt);
 663         list_del_init(&cmd->se_queue_node);
 664         spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 665
 666         if (atomic_read(&cmd->t_transport_queue_active)) {
 667                 pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
 668                         cmd->se_tfo->get_task_tag(cmd),
 669                         atomic_read(&cmd->t_transport_queue_active));
 670         }
 671 }
 672
 673 /*
 674  * Completion function used by TCM subsystem plugins (such as FILEIO)
 675  * for queueing up response from struct se_subsystem_api->do_task()
 676  */
 677 void transport_complete_sync_cache(struct se_cmd *cmd, int good)
 678 {
 679         struct se_task *task = list_entry(cmd->t_task_list.next,
 680                                 struct se_task, t_list);
 681
 682         if (good) {
 683                 cmd->scsi_status = SAM_STAT_GOOD;
 684                 task->task_scsi_status = GOOD;
 685         } else {
 686                 task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
 687                 task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
 688                 task->task_se_cmd->transport_error_status =
 689                                         PYX_TRANSPORT_ILLEGAL_REQUEST;
 690         }
 691
 692         transport_complete_task(task, good);
 693 }
 694 EXPORT_SYMBOL(transport_complete_sync_cache);
 695
 696 /*      transport_complete_task():
 697  *
 698  *      Called from interrupt and non interrupt context depending
 699  *      on the transport plugin.
 700  */
 701 void transport_complete_task(struct se_task *task, int success)
 702 {
 703         struct se_cmd *cmd = task->task_se_cmd;
 704         struct se_device *dev = cmd->se_dev;
 705         int t_state;
 706         unsigned long flags;
 707 #if 0
 708         pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
 709                         cmd->t_task_cdb[0], dev);
 710 #endif
 711         if (dev)
 712                 atomic_inc(&dev->depth_left);
 713
 714         del_timer(&task->task_timer);
 715
 716         spin_lock_irqsave(&cmd->t_state_lock, flags);
 717         task->task_flags &= ~TF_ACTIVE;
 718
 719         /*
 720          * See if any sense data exists, if so set the TASK_SENSE flag.
 721          * Also check for any other post completion work that needs to be
 722          * done by the plugins.
 723          */
 724         if (dev && dev->transport->transport_complete) {
 725                 if (dev->transport->transport_complete(task) != 0) {
 726                         cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
 727                         task->task_sense = 1;
 728                         success = 1;
 729                 }
 730         }
 731
 732         /*
 733          * See if we are waiting for outstanding struct se_task
 734          * to complete for an exception condition
 735          */
 736         if (task->task_flags & TF_REQUEST_STOP) {
 737                 /*
 738                  * Decrement cmd->t_se_count if this task had
 739                  * previously thrown its timeout exception handler.
 740                  */
 741                 if (task->task_flags & TF_TIMEOUT) {
 742                         atomic_dec(&cmd->t_se_count);
 743                         task->task_flags &= ~TF_TIMEOUT;
 744                 }
 745                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 746
 747                 complete(&task->task_stop_comp);
 748                 return;
 749         }
 750         /*
 751          * If the task's timeout handler has fired, use the t_task_cdbs_timeout
 752          * left counter to determine when the struct se_cmd is ready to be queued to
 753          * the processing thread.
 754          */
 755         if (task->task_flags & TF_TIMEOUT) {
 756                 if (!atomic_dec_and_test(
 757                                 &cmd->t_task_cdbs_timeout_left)) {
 758                         spin_unlock_irqrestore(&cmd->t_state_lock,
 759                                 flags);
 760                         return;
 761                 }
 762                 t_state = TRANSPORT_COMPLETE_TIMEOUT;
 763                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 764
 765                 transport_add_cmd_to_queue(cmd, t_state, false);
 766                 return;
 767         }
 768         atomic_dec(&cmd->t_task_cdbs_timeout_left);
 769
 770         /*
 771          * Decrement the outstanding t_task_cdbs_left count.  The last
 772          * struct se_task from struct se_cmd will complete itself into the
 773          * device queue depending upon int success.
 774          */
 775         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
 776                 if (!success)
 777                         cmd->t_tasks_failed = 1;
 778
 779                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 780                 return;
 781         }
 782
 783         if (!success || cmd->t_tasks_failed) {
 784                 t_state = TRANSPORT_COMPLETE_FAILURE;
 785                 if (!task->task_error_status) {
 786                         task->task_error_status =
 787                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 788                         cmd->transport_error_status =
 789                                 PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
 790                 }
 791         } else {
 792                 atomic_set(&cmd->t_transport_complete, 1);
 793                 t_state = TRANSPORT_COMPLETE_OK;
 794         }
 795         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 796
 797         transport_add_cmd_to_queue(cmd, t_state, false);
 798 }
 799 EXPORT_SYMBOL(transport_complete_task);
 800
 801 /*
 802  * Called by transport_add_tasks_from_cmd() once a struct se_cmd's
 803  * struct se_task list are ready to be added to the active execution list
 804  * struct se_device
 805
 806  * Called with se_dev_t->execute_task_lock called.
 807  */
 808 static inline int transport_add_task_check_sam_attr(
 809         struct se_task *task,
 810         struct se_task *task_prev,
 811         struct se_device *dev)
 812 {
 813         /*
 814          * No SAM Task attribute emulation enabled, add to tail of
 815          * execution queue
 816          */
 817         if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
 818                 list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 819                 return 0;
 820         }
 821         /*
 822          * HEAD_OF_QUEUE attribute for received CDB, which means
 823          * the first task that is associated with a struct se_cmd goes to
 824          * head of the struct se_device->execute_task_list, and task_prev
 825          * after that for each subsequent task
 826          */
 827         if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
 828                 list_add(&task->t_execute_list,
 829                                 (task_prev != NULL) ?
 830                                 &task_prev->t_execute_list :
 831                                 &dev->execute_task_list);
 832
 833                 pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
 834                                 " in execution queue\n",
 835                                 task->task_se_cmd->t_task_cdb[0]);
 836                 return 1;
 837         }
 838         /*
 839          * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
 840          * transitioned from Dermant -> Active state, and are added to the end
 841          * of the struct se_device->execute_task_list
 842          */
 843         list_add_tail(&task->t_execute_list, &dev->execute_task_list);
 844         return 0;
 845 }
 846
 847 /*      __transport_add_task_to_execute_queue():
 848  *
 849  *      Called with se_dev_t->execute_task_lock called.
 850  */
 851 static void __transport_add_task_to_execute_queue(
 852         struct se_task *task,
 853         struct se_task *task_prev,
 854         struct se_device *dev)
 855 {
 856         int head_of_queue;
 857
 858         head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
 859         atomic_inc(&dev->execute_tasks);
 860
 861         if (atomic_read(&task->task_state_active))
 862                 return;
 863         /*
 864          * Determine if this task needs to go to HEAD_OF_QUEUE for the
 865          * state list as well.  Running with SAM Task Attribute emulation
 866          * will always return head_of_queue == 0 here
 867          */
 868         if (head_of_queue)
 869                 list_add(&task->t_state_list, (task_prev) ?
 870                                 &task_prev->t_state_list :
 871                                 &dev->state_task_list);
 872         else
 873                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 874
 875         atomic_set(&task->task_state_active, 1);
 876
 877         pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 878                 task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
 879                 task, dev);
 880 }
 881
 882 static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
 883 {
 884         struct se_device *dev = cmd->se_dev;
 885         struct se_task *task;
 886         unsigned long flags;
 887
 888         spin_lock_irqsave(&cmd->t_state_lock, flags);
 889         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 890                 if (atomic_read(&task->task_state_active))
 891                         continue;
 892
 893                 spin_lock(&dev->execute_task_lock);
 894                 list_add_tail(&task->t_state_list, &dev->state_task_list);
 895                 atomic_set(&task->task_state_active, 1);
 896
 897                 pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
 898                         task->task_se_cmd->se_tfo->get_task_tag(
 899                         task->task_se_cmd), task, dev);
 900
 901                 spin_unlock(&dev->execute_task_lock);
 902         }
 903         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 904 }
 905
 906 static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
 907 {
 908         struct se_device *dev = cmd->se_dev;
 909         struct se_task *task, *task_prev = NULL;
 910         unsigned long flags;
 911
 912         spin_lock_irqsave(&dev->execute_task_lock, flags);
 913         list_for_each_entry(task, &cmd->t_task_list, t_list) {
 914                 if (!list_empty(&task->t_execute_list))
 915                         continue;
 916                 /*
 917                  * __transport_add_task_to_execute_queue() handles the
 918                  * SAM Task Attribute emulation if enabled
 919                  */
 920                 __transport_add_task_to_execute_queue(task, task_prev, dev);
 921                 task_prev = task;
 922         }
 923         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 924 }
 925
 926 void __transport_remove_task_from_execute_queue(struct se_task *task,
 927                 struct se_device *dev)
 928 {
 929         list_del_init(&task->t_execute_list);
 930         atomic_dec(&dev->execute_tasks);
 931 }
 932
 933 void transport_remove_task_from_execute_queue(
 934         struct se_task *task,
 935         struct se_device *dev)
 936 {
 937         unsigned long flags;
 938
 939         if (WARN_ON(list_empty(&task->t_execute_list)))
 940                 return;
 941
 942         spin_lock_irqsave(&dev->execute_task_lock, flags);
 943         __transport_remove_task_from_execute_queue(task, dev);
 944         spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 945 }
 946
 947 /*
 948  * Handle QUEUE_FULL / -EAGAIN status
 949  */
 950
 951 static void target_qf_do_work(struct work_struct *work)
 952 {
 953         struct se_device *dev = container_of(work, struct se_device,
 954                                         qf_work_queue);
 955         LIST_HEAD(qf_cmd_list);
 956         struct se_cmd *cmd, *cmd_tmp;
 957
 958         spin_lock_irq(&dev->qf_cmd_lock);
 959         list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 960         spin_unlock_irq(&dev->qf_cmd_lock);
 961
 962         list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 963                 list_del(&cmd->se_qf_node);
 964                 atomic_dec(&dev->dev_qf_count);
 965                 smp_mb__after_atomic_dec();
 966
 967                 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 968                         " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 969                         (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 970                         (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 971                         : "UNKNOWN");
 972
 973                 transport_add_cmd_to_queue(cmd, cmd->t_state, true);
 974         }
 975 }
 976
 977 unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 978 {
 979         switch (cmd->data_direction) {
 980         case DMA_NONE:
 981                 return "NONE";
 982         case DMA_FROM_DEVICE:
 983                 return "READ";
 984         case DMA_TO_DEVICE:
 985                 return "WRITE";
 986         case DMA_BIDIRECTIONAL:
 987                 return "BIDI";
 988         default:
 989                 break;
 990         }
 991
 992         return "UNKNOWN";
 993 }
 994
 995 void transport_dump_dev_state(
 996         struct se_device *dev,
 997         char *b,
 998         int *bl)
 999 {
1000         *bl += sprintf(b + *bl, "Status: ");
1001         switch (dev->dev_status) {
1002         case TRANSPORT_DEVICE_ACTIVATED:
1003                 *bl += sprintf(b + *bl, "ACTIVATED");
1004                 break;
1005         case TRANSPORT_DEVICE_DEACTIVATED:
1006                 *bl += sprintf(b + *bl, "DEACTIVATED");
1007                 break;
1008         case TRANSPORT_DEVICE_SHUTDOWN:
1009                 *bl += sprintf(b + *bl, "SHUTDOWN");
1010                 break;
1011         case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
1012         case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
1013                 *bl += sprintf(b + *bl, "OFFLINE");
1014                 break;
1015         default:
1016                 *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
1017                 break;
1018         }
1019
1020         *bl += sprintf(b + *bl, "  Execute/Left/Max Queue Depth: %d/%d/%d",
1021                 atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
1022                 dev->queue_depth);
1023         *bl += sprintf(b + *bl, "  SectorSize: %u  MaxSectors: %u\n",
1024                 dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
1025         *bl += sprintf(b + *bl, "        ");
1026 }
1027
1028 void transport_dump_vpd_proto_id(
1029         struct t10_vpd *vpd,
1030         unsigned char *p_buf,
1031         int p_buf_len)
1032 {
1033         unsigned char buf[VPD_TMP_BUF_SIZE];
1034         int len;
1035
1036         memset(buf, 0, VPD_TMP_BUF_SIZE);
1037         len = sprintf(buf, "T10 VPD Protocol Identifier: ");
1038
1039         switch (vpd->protocol_identifier) {
1040         case 0x00:
1041                 sprintf(buf+len, "Fibre Channel\n");
1042                 break;
1043         case 0x10:
1044                 sprintf(buf+len, "Parallel SCSI\n");
1045                 break;
1046         case 0x20:
1047                 sprintf(buf+len, "SSA\n");
1048                 break;
1049         case 0x30:
1050                 sprintf(buf+len, "IEEE 1394\n");
1051                 break;
1052         case 0x40:
1053                 sprintf(buf+len, "SCSI Remote Direct Memory Access"
1054                                 " Protocol\n");
1055                 break;
1056         case 0x50:
1057                 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
1058                 break;
1059         case 0x60:
1060                 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
1061                 break;
1062         case 0x70:
1063                 sprintf(buf+len, "Automation/Drive Interface Transport"
1064                                 " Protocol\n");
1065                 break;
1066         case 0x80:
1067                 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
1068                 break;
1069         default:
1070                 sprintf(buf+len, "Unknown 0x%02x\n",
1071                                 vpd->protocol_identifier);
1072                 break;
1073         }
1074
1075         if (p_buf)
1076                 strncpy(p_buf, buf, p_buf_len);
1077         else
1078                 pr_debug("%s", buf);
1079 }
1080
1081 void
1082 transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
1083 {
1084         /*
1085          * Check if the Protocol Identifier Valid (PIV) bit is set..
1086          *
1087          * from spc3r23.pdf section 7.5.1
1088          */
1089          if (page_83[1] & 0x80) {
1090                 vpd->protocol_identifier = (page_83[0] & 0xf0);
1091                 vpd->protocol_identifier_set = 1;
1092                 transport_dump_vpd_proto_id(vpd, NULL, 0);
1093         }
1094 }
1095 EXPORT_SYMBOL(transport_set_vpd_proto_id);
1096
1097 int transport_dump_vpd_assoc(
1098         struct t10_vpd *vpd,
1099         unsigned char *p_buf,
1100         int p_buf_len)
1101 {
1102         unsigned char buf[VPD_TMP_BUF_SIZE];
1103         int ret = 0;
1104         int len;
1105
1106         memset(buf, 0, VPD_TMP_BUF_SIZE);
1107         len = sprintf(buf, "T10 VPD Identifier Association: ");
1108
1109         switch (vpd->association) {
1110         case 0x00:
1111                 sprintf(buf+len, "addressed logical unit\n");
1112                 break;
1113         case 0x10:
1114                 sprintf(buf+len, "target port\n");
1115                 break;
1116         case 0x20:
1117                 sprintf(buf+len, "SCSI target device\n");
1118                 break;
1119         default:
1120                 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
1121                 ret = -EINVAL;
1122                 break;
1123         }
1124
1125         if (p_buf)
1126                 strncpy(p_buf, buf, p_buf_len);
1127         else
1128                 pr_debug("%s", buf);
1129
1130         return ret;
1131 }
1132
1133 int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
1134 {
1135         /*
1136          * The VPD identification association..
1137          *
1138          * from spc3r23.pdf Section 7.6.3.1 Table 297
1139          */
1140         vpd->association = (page_83[1] & 0x30);
1141         return transport_dump_vpd_assoc(vpd, NULL, 0);
1142 }
1143 EXPORT_SYMBOL(transport_set_vpd_assoc);
1144
1145 int transport_dump_vpd_ident_type(
1146         struct t10_vpd *vpd,
1147         unsigned char *p_buf,
1148         int p_buf_len)
1149 {
1150         unsigned char buf[VPD_TMP_BUF_SIZE];
1151         int ret = 0;
1152         int len;
1153
1154         memset(buf, 0, VPD_TMP_BUF_SIZE);
1155         len = sprintf(buf, "T10 VPD Identifier Type: ");
1156
1157         switch (vpd->device_identifier_type) {
1158         case 0x00:
1159                 sprintf(buf+len, "Vendor specific\n");
1160                 break;
1161         case 0x01:
1162                 sprintf(buf+len, "T10 Vendor ID based\n");
1163                 break;
1164         case 0x02:
1165                 sprintf(buf+len, "EUI-64 based\n");
1166                 break;
1167         case 0x03:
1168                 sprintf(buf+len, "NAA\n");
1169                 break;
1170         case 0x04:
1171                 sprintf(buf+len, "Relative target port identifier\n");
1172                 break;
1173         case 0x08:
1174                 sprintf(buf+len, "SCSI name string\n");
1175                 break;
1176         default:
1177                 sprintf(buf+len, "Unsupported: 0x%02x\n",
1178                                 vpd->device_identifier_type);
1179                 ret = -EINVAL;
1180                 break;
1181         }
1182
1183         if (p_buf) {
1184                 if (p_buf_len < strlen(buf)+1)
1185                         return -EINVAL;
1186                 strncpy(p_buf, buf, p_buf_len);
1187         } else {
1188                 pr_debug("%s", buf);
1189         }
1190
1191         return ret;
1192 }
1193
1194 int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1195 {
1196         /*
1197          * The VPD identifier type..
1198          *
1199          * from spc3r23.pdf Section 7.6.3.1 Table 298
1200          */
1201         vpd->device_identifier_type = (page_83[1] & 0x0f);
1202         return transport_dump_vpd_ident_type(vpd, NULL, 0);
1203 }
1204 EXPORT_SYMBOL(transport_set_vpd_ident_type);
1205
1206 int transport_dump_vpd_ident(
1207         struct t10_vpd *vpd,
1208         unsigned char *p_buf,
1209         int p_buf_len)
1210 {
1211         unsigned char buf[VPD_TMP_BUF_SIZE];
1212         int ret = 0;
1213
1214         memset(buf, 0, VPD_TMP_BUF_SIZE);
1215
1216         switch (vpd->device_identifier_code_set) {
1217         case 0x01: /* Binary */
1218                 sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
1219                         &vpd->device_identifier[0]);
1220                 break;
1221         case 0x02: /* ASCII */
1222                 sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
1223                         &vpd->device_identifier[0]);
1224                 break;
1225         case 0x03: /* UTF-8 */
1226                 sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
1227                         &vpd->device_identifier[0]);
1228                 break;
1229         default:
1230                 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1231                         " 0x%02x", vpd->device_identifier_code_set);
1232                 ret = -EINVAL;
1233                 break;
1234         }
1235
1236         if (p_buf)
1237                 strncpy(p_buf, buf, p_buf_len);
1238         else
1239                 pr_debug("%s", buf);
1240
1241         return ret;
1242 }
1243
1244 int
1245 transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1246 {
1247         static const char hex_str[] = "0123456789abcdef";
1248         int j = 0, i = 4; /* offset to start of the identifer */
1249
1250         /*
1251          * The VPD Code Set (encoding)
1252          *
1253          * from spc3r23.pdf Section 7.6.3.1 Table 296
1254          */
1255         vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1256         switch (vpd->device_identifier_code_set) {
1257         case 0x01: /* Binary */
1258                 vpd->device_identifier[j++] =
1259                                 hex_str[vpd->device_identifier_type];
1260                 while (i < (4 + page_83[3])) {
1261                         vpd->device_identifier[j++] =
1262                                 hex_str[(page_83[i] & 0xf0) >> 4];
1263                         vpd->device_identifier[j++] =
1264                                 hex_str[page_83[i] & 0x0f];
1265                         i++;
1266                 }
1267                 break;
1268         case 0x02: /* ASCII */
1269         case 0x03: /* UTF-8 */
1270                 while (i < (4 + page_83[3]))
1271                         vpd->device_identifier[j++] = page_83[i++];
1272                 break;
1273         default:
1274                 break;
1275         }
1276
1277         return transport_dump_vpd_ident(vpd, NULL, 0);
1278 }
1279 EXPORT_SYMBOL(transport_set_vpd_ident);
1280
1281 static void core_setup_task_attr_emulation(struct se_device *dev)
1282 {
1283         /*
1284          * If this device is from Target_Core_Mod/pSCSI, disable the
1285          * SAM Task Attribute emulation.
1286          *
1287          * This is currently not available in upsream Linux/SCSI Target
1288          * mode code, and is assumed to be disabled while using TCM/pSCSI.
1289          */
1290         if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1291                 dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1292                 return;
1293         }
1294
1295         dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1296         pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1297                 " device\n", dev->transport->name,
1298                 dev->transport->get_device_rev(dev));
1299 }
1300
1301 static void scsi_dump_inquiry(struct se_device *dev)
1302 {
1303         struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1304         int i, device_type;
1305         /*
1306          * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1307          */
1308         pr_debug("  Vendor: ");
1309         for (i = 0; i < 8; i++)
1310                 if (wwn->vendor[i] >= 0x20)
1311                         pr_debug("%c", wwn->vendor[i]);
1312                 else
1313                         pr_debug(" ");
1314
1315         pr_debug("  Model: ");
1316         for (i = 0; i < 16; i++)
1317                 if (wwn->model[i] >= 0x20)
1318                         pr_debug("%c", wwn->model[i]);
1319                 else
1320                         pr_debug(" ");
1321
1322         pr_debug("  Revision: ");
1323         for (i = 0; i < 4; i++)
1324                 if (wwn->revision[i] >= 0x20)
1325                         pr_debug("%c", wwn->revision[i]);
1326                 else
1327                         pr_debug(" ");
1328
1329         pr_debug("\n");
1330
1331         device_type = dev->transport->get_device_type(dev);
1332         pr_debug("  Type:   %s ", scsi_device_type(device_type));
1333         pr_debug("                 ANSI SCSI revision: %02x\n",
1334                                 dev->transport->get_device_rev(dev));
1335 }
1336
1337 struct se_device *transport_add_device_to_core_hba(
1338         struct se_hba *hba,
1339         struct se_subsystem_api *transport,
1340         struct se_subsystem_dev *se_dev,
1341         u32 device_flags,
1342         void *transport_dev,
1343         struct se_dev_limits *dev_limits,
1344         const char *inquiry_prod,
1345         const char *inquiry_rev)
1346 {
1347         int force_pt;
1348         struct se_device  *dev;
1349
1350         dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1351         if (!dev) {
1352                 pr_err("Unable to allocate memory for se_dev_t\n");
1353                 return NULL;
1354         }
1355
1356         transport_init_queue_obj(&dev->dev_queue_obj);
1357         dev->dev_flags          = device_flags;
1358         dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1359         dev->dev_ptr            = transport_dev;
1360         dev->se_hba             = hba;
1361         dev->se_sub_dev         = se_dev;
1362         dev->transport          = transport;
1363         atomic_set(&dev->active_cmds, 0);
1364         INIT_LIST_HEAD(&dev->dev_list);
1365         INIT_LIST_HEAD(&dev->dev_sep_list);
1366         INIT_LIST_HEAD(&dev->dev_tmr_list);
1367         INIT_LIST_HEAD(&dev->execute_task_list);
1368         INIT_LIST_HEAD(&dev->delayed_cmd_list);
1369         INIT_LIST_HEAD(&dev->ordered_cmd_list);
1370         INIT_LIST_HEAD(&dev->state_task_list);
1371         INIT_LIST_HEAD(&dev->qf_cmd_list);
1372         spin_lock_init(&dev->execute_task_lock);
1373         spin_lock_init(&dev->delayed_cmd_lock);
1374         spin_lock_init(&dev->ordered_cmd_lock);
1375         spin_lock_init(&dev->state_task_lock);
1376         spin_lock_init(&dev->dev_alua_lock);
1377         spin_lock_init(&dev->dev_reservation_lock);
1378         spin_lock_init(&dev->dev_status_lock);
1379         spin_lock_init(&dev->dev_status_thr_lock);
1380         spin_lock_init(&dev->se_port_lock);
1381         spin_lock_init(&dev->se_tmr_lock);
1382         spin_lock_init(&dev->qf_cmd_lock);
1383
1384         dev->queue_depth        = dev_limits->queue_depth;
1385         atomic_set(&dev->depth_left, dev->queue_depth);
1386         atomic_set(&dev->dev_ordered_id, 0);
1387
1388         se_dev_set_default_attribs(dev, dev_limits);
1389
1390         dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1391         dev->creation_time = get_jiffies_64();
1392         spin_lock_init(&dev->stats_lock);
1393
1394         spin_lock(&hba->device_lock);
1395         list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1396         hba->dev_count++;
1397         spin_unlock(&hba->device_lock);
1398         /*
1399          * Setup the SAM Task Attribute emulation for struct se_device
1400          */
1401         core_setup_task_attr_emulation(dev);
1402         /*
1403          * Force PR and ALUA passthrough emulation with internal object use.
1404          */
1405         force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1406         /*
1407          * Setup the Reservations infrastructure for struct se_device
1408          */
1409         core_setup_reservations(dev, force_pt);
1410         /*
1411          * Setup the Asymmetric Logical Unit Assignment for struct se_device
1412          */
1413         if (core_setup_alua(dev, force_pt) < 0)
1414                 goto out;
1415
1416         /*
1417          * Startup the struct se_device processing thread
1418          */
1419         dev->process_thread = kthread_run(transport_processing_thread, dev,
1420                                           "LIO_%s", dev->transport->name);
1421         if (IS_ERR(dev->process_thread)) {
1422                 pr_err("Unable to create kthread: LIO_%s\n",
1423                         dev->transport->name);
1424                 goto out;
1425         }
1426         /*
1427          * Setup work_queue for QUEUE_FULL
1428          */
1429         INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1430         /*
1431          * Preload the initial INQUIRY const values if we are doing
1432          * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1433          * passthrough because this is being provided by the backend LLD.
1434          * This is required so that transport_get_inquiry() copies these
1435          * originals once back into DEV_T10_WWN(dev) for the virtual device
1436          * setup.
1437          */
1438         if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1439                 if (!inquiry_prod || !inquiry_rev) {
1440                         pr_err("All non TCM/pSCSI plugins require"
1441                                 " INQUIRY consts\n");
1442                         goto out;
1443                 }
1444
1445                 strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1446                 strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1447                 strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1448         }
1449         scsi_dump_inquiry(dev);
1450
1451         return dev;
1452 out:
1453         kthread_stop(dev->process_thread);
1454
1455         spin_lock(&hba->device_lock);
1456         list_del(&dev->dev_list);
1457         hba->dev_count--;
1458         spin_unlock(&hba->device_lock);
1459
1460         se_release_vpd_for_dev(dev);
1461
1462         kfree(dev);
1463
1464         return NULL;
1465 }
1466 EXPORT_SYMBOL(transport_add_device_to_core_hba);
1467
1468 /*      transport_generic_prepare_cdb():
1469  *
1470  *      Since the Initiator sees iSCSI devices as LUNs,  the SCSI CDB will
1471  *      contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
1472  *      The point of this is since we are mapping iSCSI LUNs to
1473  *      SCSI Target IDs having a non-zero LUN in the CDB will throw the
1474  *      devices and HBAs for a loop.
1475  */
1476 static inline void transport_generic_prepare_cdb(
1477         unsigned char *cdb)
1478 {
1479         switch (cdb[0]) {
1480         case READ_10: /* SBC - RDProtect */
1481         case READ_12: /* SBC - RDProtect */
1482         case READ_16: /* SBC - RDProtect */
1483         case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
1484         case VERIFY: /* SBC - VRProtect */
1485         case VERIFY_16: /* SBC - VRProtect */
1486         case WRITE_VERIFY: /* SBC - VRProtect */
1487         case WRITE_VERIFY_12: /* SBC - VRProtect */
1488                 break;
1489         default:
1490                 cdb[1] &= 0x1f; /* clear logical unit number */
1491                 break;
1492         }
1493 }
1494
1495 static struct se_task *
1496 transport_generic_get_task(struct se_cmd *cmd,
1497                 enum dma_data_direction data_direction)
1498 {
1499         struct se_task *task;
1500         struct se_device *dev = cmd->se_dev;
1501
1502         task = dev->transport->alloc_task(cmd->t_task_cdb);
1503         if (!task) {
1504                 pr_err("Unable to allocate struct se_task\n");
1505                 return NULL;
1506         }
1507
1508         INIT_LIST_HEAD(&task->t_list);
1509         INIT_LIST_HEAD(&task->t_execute_list);
1510         INIT_LIST_HEAD(&task->t_state_list);
1511         init_timer(&task->task_timer);
1512         init_completion(&task->task_stop_comp);
1513         task->task_se_cmd = cmd;
1514         task->task_data_direction = data_direction;
1515
1516         return task;
1517 }
1518
1519 static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
1520
1521 /*
1522  * Used by fabric modules containing a local struct se_cmd within their
1523  * fabric dependent per I/O descriptor.
1524  */
1525 void transport_init_se_cmd(
1526         struct se_cmd *cmd,
1527         struct target_core_fabric_ops *tfo,
1528         struct se_session *se_sess,
1529         u32 data_length,
1530         int data_direction,
1531         int task_attr,
1532         unsigned char *sense_buffer)
1533 {
1534         INIT_LIST_HEAD(&cmd->se_lun_node);
1535         INIT_LIST_HEAD(&cmd->se_delayed_node);
1536         INIT_LIST_HEAD(&cmd->se_ordered_node);
1537         INIT_LIST_HEAD(&cmd->se_qf_node);
1538         INIT_LIST_HEAD(&cmd->se_queue_node);
1539
1540         INIT_LIST_HEAD(&cmd->t_task_list);
1541         init_completion(&cmd->transport_lun_fe_stop_comp);
1542         init_completion(&cmd->transport_lun_stop_comp);
1543         init_completion(&cmd->t_transport_stop_comp);
1544         spin_lock_init(&cmd->t_state_lock);
1545         atomic_set(&cmd->transport_dev_active, 1);
1546
1547         cmd->se_tfo = tfo;
1548         cmd->se_sess = se_sess;
1549         cmd->data_length = data_length;
1550         cmd->data_direction = data_direction;
1551         cmd->sam_task_attr = task_attr;
1552         cmd->sense_buffer = sense_buffer;
1553 }
1554 EXPORT_SYMBOL(transport_init_se_cmd);
1555
1556 static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1557 {
1558         /*
1559          * Check if SAM Task Attribute emulation is enabled for this
1560          * struct se_device storage object
1561          */
1562         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1563                 return 0;
1564
1565         if (cmd->sam_task_attr == MSG_ACA_TAG) {
1566                 pr_debug("SAM Task Attribute ACA"
1567                         " emulation is not supported\n");
1568                 return -EINVAL;
1569         }
1570         /*
1571          * Used to determine when ORDERED commands should go from
1572          * Dormant to Active status.
1573          */
1574         cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1575         smp_mb__after_atomic_inc();
1576         pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1577                         cmd->se_ordered_id, cmd->sam_task_attr,
1578                         cmd->se_dev->transport->name);
1579         return 0;
1580 }
1581
1582 /*      transport_generic_allocate_tasks():
1583  *
1584  *      Called from fabric RX Thread.
1585  */
1586 int transport_generic_allocate_tasks(
1587         struct se_cmd *cmd,
1588         unsigned char *cdb)
1589 {
1590         int ret;
1591
1592         transport_generic_prepare_cdb(cdb);
1593         /*
1594          * Ensure that the received CDB is less than the max (252 + 8) bytes
1595          * for VARIABLE_LENGTH_CMD
1596          */
1597         if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1598                 pr_err("Received SCSI CDB with command_size: %d that"
1599                         " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1600                         scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1601                 return -EINVAL;
1602         }
1603         /*
1604          * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1605          * allocate the additional extended CDB buffer now..  Otherwise
1606          * setup the pointer from __t_task_cdb to t_task_cdb.
1607          */
1608         if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1609                 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1610                                                 GFP_KERNEL);
1611                 if (!cmd->t_task_cdb) {
1612                         pr_err("Unable to allocate cmd->t_task_cdb"
1613                                 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1614                                 scsi_command_size(cdb),
1615                                 (unsigned long)sizeof(cmd->__t_task_cdb));
1616                         return -ENOMEM;
1617                 }
1618         } else
1619                 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1620         /*
1621          * Copy the original CDB into cmd->
1622          */
1623         memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1624         /*
1625          * Setup the received CDB based on SCSI defined opcodes and
1626          * perform unit attention, persistent reservations and ALUA
1627          * checks for virtual device backends.  The cmd->t_task_cdb
1628          * pointer is expected to be setup before we reach this point.
1629          */
1630         ret = transport_generic_cmd_sequencer(cmd, cdb);
1631         if (ret < 0)
1632                 return ret;
1633         /*
1634          * Check for SAM Task Attribute Emulation
1635          */
1636         if (transport_check_alloc_task_attr(cmd) < 0) {
1637                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1638                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1639                 return -EINVAL;
1640         }
1641         spin_lock(&cmd->se_lun->lun_sep_lock);
1642         if (cmd->se_lun->lun_sep)
1643                 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1644         spin_unlock(&cmd->se_lun->lun_sep_lock);
1645         return 0;
1646 }
1647 EXPORT_SYMBOL(transport_generic_allocate_tasks);
1648
1649 static void transport_generic_request_failure(struct se_cmd *,
1650                         struct se_device *, int, int);
1651 /*
1652  * Used by fabric module frontends to queue tasks directly.
1653  * Many only be used from process context only
1654  */
1655 int transport_handle_cdb_direct(
1656         struct se_cmd *cmd)
1657 {
1658         int ret;
1659
1660         if (!cmd->se_lun) {
1661                 dump_stack();
1662                 pr_err("cmd->se_lun is NULL\n");
1663                 return -EINVAL;
1664         }
1665         if (in_interrupt()) {
1666                 dump_stack();
1667                 pr_err("transport_generic_handle_cdb cannot be called"
1668                                 " from interrupt context\n");
1669                 return -EINVAL;
1670         }
1671         /*
1672          * Set TRANSPORT_NEW_CMD state and cmd->t_transport_active=1 following
1673          * transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
1674          * in existing usage to ensure that outstanding descriptors are handled
1675          * correctly during shutdown via transport_wait_for_tasks()
1676          *
1677          * Also, we don't take cmd->t_state_lock here as we only expect
1678          * this to be called for initial descriptor submission.
1679          */
1680         cmd->t_state = TRANSPORT_NEW_CMD;
1681         atomic_set(&cmd->t_transport_active, 1);
1682         /*
1683          * transport_generic_new_cmd() is already handling QUEUE_FULL,
1684          * so follow TRANSPORT_NEW_CMD processing thread context usage
1685          * and call transport_generic_request_failure() if necessary..
1686          */
1687         ret = transport_generic_new_cmd(cmd);
1688         if (ret == -EAGAIN)
1689                 return 0;
1690         else if (ret < 0) {
1691                 cmd->transport_error_status = ret;
1692                 transport_generic_request_failure(cmd, NULL, 0,
1693                                 (cmd->data_direction != DMA_TO_DEVICE));
1694         }
1695         return 0;
1696 }
1697 EXPORT_SYMBOL(transport_handle_cdb_direct);
1698
1699 /*
1700  * Used by fabric module frontends defining a TFO->new_cmd_map() caller
1701  * to  queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
1702  * complete setup in TCM process context w/ TFO->new_cmd_map().
1703  */
1704 int transport_generic_handle_cdb_map(
1705         struct se_cmd *cmd)
1706 {
1707         if (!cmd->se_lun) {
1708                 dump_stack();
1709                 pr_err("cmd->se_lun is NULL\n");
1710                 return -EINVAL;
1711         }
1712
1713         transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
1714         return 0;
1715 }
1716 EXPORT_SYMBOL(transport_generic_handle_cdb_map);
1717
1718 /*      transport_generic_handle_data():
1719  *
1720  *
1721  */
1722 int transport_generic_handle_data(
1723         struct se_cmd *cmd)
1724 {
1725         /*
1726          * For the software fabric case, then we assume the nexus is being
1727          * failed/shutdown when signals are pending from the kthread context
1728          * caller, so we return a failure.  For the HW target mode case running
1729          * in interrupt code, the signal_pending() check is skipped.
1730          */
1731         if (!in_interrupt() && signal_pending(current))
1732                 return -EPERM;
1733         /*
1734          * If the received CDB has aleady been ABORTED by the generic
1735          * target engine, we now call transport_check_aborted_status()
1736          * to queue any delated TASK_ABORTED status for the received CDB to the
1737          * fabric module as we are expecting no further incoming DATA OUT
1738          * sequences at this point.
1739          */
1740         if (transport_check_aborted_status(cmd, 1) != 0)
1741                 return 0;
1742
1743         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
1744         return 0;
1745 }
1746 EXPORT_SYMBOL(transport_generic_handle_data);
1747
1748 /*      transport_generic_handle_tmr():
1749  *
1750  *
1751  */
1752 int transport_generic_handle_tmr(
1753         struct se_cmd *cmd)
1754 {
1755         transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
1756         return 0;
1757 }
1758 EXPORT_SYMBOL(transport_generic_handle_tmr);
1759
1760 void transport_generic_free_cmd_intr(
1761         struct se_cmd *cmd)
1762 {
1763         transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR, false);
1764 }
1765 EXPORT_SYMBOL(transport_generic_free_cmd_intr);
1766
1767 /*
1768  * If the task is active, request it to be stopped and sleep until it
1769  * has completed.
1770  */
1771 bool target_stop_task(struct se_task *task, unsigned long *flags)
1772 {
1773         struct se_cmd *cmd = task->task_se_cmd;
1774         bool was_active = false;
1775
1776         if (task->task_flags & TF_ACTIVE) {
1777                 task->task_flags |= TF_REQUEST_STOP;
1778                 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1779
1780                 pr_debug("Task %p waiting to complete\n", task);
1781                 del_timer_sync(&task->task_timer);
1782                 wait_for_completion(&task->task_stop_comp);
1783                 pr_debug("Task %p stopped successfully\n", task);
1784
1785                 spin_lock_irqsave(&cmd->t_state_lock, *flags);
1786                 atomic_dec(&cmd->t_task_cdbs_left);
1787                 task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
1788                 was_active = true;
1789         }
1790
1791         return was_active;
1792 }
1793
1794 static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
1795 {
1796         struct se_task *task, *task_tmp;
1797         unsigned long flags;
1798         int ret = 0;
1799
1800         pr_debug("ITT[0x%08x] - Stopping tasks\n",
1801                 cmd->se_tfo->get_task_tag(cmd));
1802
1803         /*
1804          * No tasks remain in the execution queue
1805          */
1806         spin_lock_irqsave(&cmd->t_state_lock, flags);
1807         list_for_each_entry_safe(task, task_tmp,
1808                                 &cmd->t_task_list, t_list) {
1809                 pr_debug("Processing task %p\n", task);
1810                 /*
1811                  * If the struct se_task has not been sent and is not active,
1812                  * remove the struct se_task from the execution queue.
1813                  */
1814                 if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
1815                         spin_unlock_irqrestore(&cmd->t_state_lock,
1816                                         flags);
1817                         transport_remove_task_from_execute_queue(task,
1818                                         cmd->se_dev);
1819
1820                         pr_debug("Task %p removed from execute queue\n", task);
1821                         spin_lock_irqsave(&cmd->t_state_lock, flags);
1822                         continue;
1823                 }
1824
1825                 if (!target_stop_task(task, &flags)) {
1826                         pr_debug("Task %p - did nothing\n", task);
1827                         ret++;
1828                 }
1829         }
1830         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1831
1832         return ret;
1833 }
1834
1835 /*
1836  * Handle SAM-esque emulation for generic transport request failures.
1837  */
1838 static void transport_generic_request_failure(
1839         struct se_cmd *cmd,
1840         struct se_device *dev,
1841         int complete,
1842         int sc)
1843 {
1844         int ret = 0;
1845
1846         pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1847                 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1848                 cmd->t_task_cdb[0]);
1849         pr_debug("-----[ i_state: %d t_state/def_t_state:"
1850                 " %d/%d transport_error_status: %d\n",
1851                 cmd->se_tfo->get_cmd_state(cmd),
1852                 cmd->t_state, cmd->deferred_t_state,
1853                 cmd->transport_error_status);
1854         pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
1855                 " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
1856                 " t_transport_active: %d t_transport_stop: %d"
1857                 " t_transport_sent: %d\n", cmd->t_task_list_num,
1858                 atomic_read(&cmd->t_task_cdbs_left),
1859                 atomic_read(&cmd->t_task_cdbs_sent),
1860                 atomic_read(&cmd->t_task_cdbs_ex_left),
1861                 atomic_read(&cmd->t_transport_active),
1862                 atomic_read(&cmd->t_transport_stop),
1863                 atomic_read(&cmd->t_transport_sent));
1864
1865         if (dev)
1866                 atomic_inc(&dev->depth_left);
1867         /*
1868          * For SAM Task Attribute emulation for failed struct se_cmd
1869          */
1870         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1871                 transport_complete_task_attr(cmd);
1872
1873         if (complete) {
1874                 transport_direct_request_timeout(cmd);
1875                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
1876         }
1877
1878         switch (cmd->transport_error_status) {
1879         case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
1880                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1881                 break;
1882         case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
1883                 cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
1884                 break;
1885         case PYX_TRANSPORT_INVALID_CDB_FIELD:
1886                 cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1887                 break;
1888         case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
1889                 cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
1890                 break;
1891         case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
1892                 if (!sc)
1893                         transport_new_cmd_failure(cmd);
1894                 /*
1895                  * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
1896                  * we force this session to fall back to session
1897                  * recovery.
1898                  */
1899                 cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
1900                 cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
1901
1902                 goto check_stop;
1903         case PYX_TRANSPORT_LU_COMM_FAILURE:
1904         case PYX_TRANSPORT_ILLEGAL_REQUEST:
1905                 cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1906                 break;
1907         case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
1908                 cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
1909                 break;
1910         case PYX_TRANSPORT_WRITE_PROTECTED:
1911                 cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
1912                 break;
1913         case PYX_TRANSPORT_RESERVATION_CONFLICT:
1914                 /*
1915                  * No SENSE Data payload for this case, set SCSI Status
1916                  * and queue the response to $FABRIC_MOD.
1917                  *
1918                  * Uses linux/include/scsi/scsi.h SAM status codes defs
1919                  */
1920                 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1921                 /*
1922                  * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1923                  * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1924                  * CONFLICT STATUS.
1925                  *
1926                  * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1927                  */
1928                 if (cmd->se_sess &&
1929                     cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1930                         core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1931                                 cmd->orig_fe_lun, 0x2C,
1932                                 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1933
1934                 ret = cmd->se_tfo->queue_status(cmd);
1935                 if (ret == -EAGAIN)
1936                         goto queue_full;
1937                 goto check_stop;
1938         case PYX_TRANSPORT_USE_SENSE_REASON:
1939                 /*
1940                  * struct se_cmd->scsi_sense_reason already set
1941                  */
1942                 break;
1943         default:
1944                 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1945                         cmd->t_task_cdb[0],
1946                         cmd->transport_error_status);
1947                 cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1948                 break;
1949         }
1950         /*
1951          * If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
1952          * make the call to transport_send_check_condition_and_sense()
1953          * directly.  Otherwise expect the fabric to make the call to
1954          * transport_send_check_condition_and_sense() after handling
1955          * possible unsoliticied write data payloads.
1956          */
1957         if (!sc && !cmd->se_tfo->new_cmd_map)
1958                 transport_new_cmd_failure(cmd);
1959         else {
1960                 ret = transport_send_check_condition_and_sense(cmd,
1961                                 cmd->scsi_sense_reason, 0);
1962                 if (ret == -EAGAIN)
1963                         goto queue_full;
1964         }
1965
1966 check_stop:
1967         transport_lun_remove_cmd(cmd);
1968         if (!transport_cmd_check_stop_to_fabric(cmd))
1969                 ;
1970         return;
1971
1972 queue_full:
1973         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1974         transport_handle_queue_full(cmd, cmd->se_dev);
1975 }
1976
1977 static void transport_direct_request_timeout(struct se_cmd *cmd)
1978 {
1979         unsigned long flags;
1980
1981         spin_lock_irqsave(&cmd->t_state_lock, flags);
1982         if (!atomic_read(&cmd->t_transport_timeout)) {
1983                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1984                 return;
1985         }
1986         if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
1987                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1988                 return;
1989         }
1990
1991         atomic_sub(atomic_read(&cmd->t_transport_timeout),
1992                    &cmd->t_se_count);
1993         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1994 }
1995
1996 static void transport_generic_request_timeout(struct se_cmd *cmd)
1997 {
1998         unsigned long flags;
1999
2000         /*
2001          * Reset cmd->t_se_count to allow transport_put_cmd()
2002          * to allow last call to free memory resources.
2003          */
2004         spin_lock_irqsave(&cmd->t_state_lock, flags);
2005         if (atomic_read(&cmd->t_transport_timeout) > 1) {
2006                 int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
2007
2008                 atomic_sub(tmp, &cmd->t_se_count);
2009         }
2010         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2011
2012         transport_put_cmd(cmd);
2013 }
2014
2015 static inline u32 transport_lba_21(unsigned char *cdb)
2016 {
2017         return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
2018 }
2019
2020 static inline u32 transport_lba_32(unsigned char *cdb)
2021 {
2022         return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2023 }
2024
2025 static inline unsigned long long transport_lba_64(unsigned char *cdb)
2026 {
2027         unsigned int __v1, __v2;
2028
2029         __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
2030         __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
2031
2032         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2033 }
2034
2035 /*
2036  * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
2037  */
2038 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
2039 {
2040         unsigned int __v1, __v2;
2041
2042         __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
2043         __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
2044
2045         return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
2046 }
2047
2048 static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
2049 {
2050         unsigned long flags;
2051
2052         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2053         se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
2054         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2055 }
2056
2057 /*
2058  * Called from interrupt context.
2059  */
2060 static void transport_task_timeout_handler(unsigned long data)
2061 {
2062         struct se_task *task = (struct se_task *)data;
2063         struct se_cmd *cmd = task->task_se_cmd;
2064         unsigned long flags;
2065
2066         pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
2067
2068         spin_lock_irqsave(&cmd->t_state_lock, flags);
2069
2070         /*
2071          * Determine if transport_complete_task() has already been called.
2072          */
2073         if (!(task->task_flags & TF_ACTIVE)) {
2074                 pr_debug("transport task: %p cmd: %p timeout !TF_ACTIVE\n",
2075                          task, cmd);
2076                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2077                 return;
2078         }
2079
2080         atomic_inc(&cmd->t_se_count);
2081         atomic_inc(&cmd->t_transport_timeout);
2082         cmd->t_tasks_failed = 1;
2083
2084         task->task_flags |= TF_TIMEOUT;
2085         task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
2086         task->task_scsi_status = 1;
2087
2088         if (task->task_flags & TF_REQUEST_STOP) {
2089                 pr_debug("transport task: %p cmd: %p timeout TF_REQUEST_STOP"
2090                                 " == 1\n", task, cmd);
2091                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2092                 complete(&task->task_stop_comp);
2093                 return;
2094         }
2095
2096         if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
2097                 pr_debug("transport task: %p cmd: %p timeout non zero"
2098                                 " t_task_cdbs_left\n", task, cmd);
2099                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2100                 return;
2101         }
2102         pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
2103                         task, cmd);
2104
2105         cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
2106         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2107
2108         transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE, false);
2109 }
2110
2111 static void transport_start_task_timer(struct se_task *task)
2112 {
2113         struct se_device *dev = task->task_se_cmd->se_dev;
2114         int timeout;
2115
2116         /*
2117          * If the task_timeout is disabled, exit now.
2118          */
2119         timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
2120         if (!timeout)
2121                 return;
2122
2123         task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
2124         task->task_timer.data = (unsigned long) task;
2125         task->task_timer.function = transport_task_timeout_handler;
2126         add_timer(&task->task_timer);
2127 }
2128
2129 static inline int transport_tcq_window_closed(struct se_device *dev)
2130 {
2131         if (dev->dev_tcq_window_closed++ <
2132                         PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
2133                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
2134         } else
2135                 msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
2136
2137         wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
2138         return 0;
2139 }
2140
2141 /*
2142  * Called from Fabric Module context from transport_execute_tasks()
2143  *
2144  * The return of this function determins if the tasks from struct se_cmd
2145  * get added to the execution queue in transport_execute_tasks(),
2146  * or are added to the delayed or ordered lists here.
2147  */
2148 static inline int transport_execute_task_attr(struct se_cmd *cmd)
2149 {
2150         if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
2151                 return 1;
2152         /*
2153          * Check for the existence of HEAD_OF_QUEUE, and if true return 1
2154          * to allow the passed struct se_cmd list of tasks to the front of the list.
2155          */
2156          if (cmd->sam_task_attr == MSG_HEAD_TAG) {
2157                 atomic_inc(&cmd->se_dev->dev_hoq_count);
2158                 smp_mb__after_atomic_inc();
2159                 pr_debug("Added HEAD_OF_QUEUE for CDB:"
2160                         " 0x%02x, se_ordered_id: %u\n",
2161                         cmd->t_task_cdb[0],
2162                         cmd->se_ordered_id);
2163                 return 1;
2164         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
2165                 spin_lock(&cmd->se_dev->ordered_cmd_lock);
2166                 list_add_tail(&cmd->se_ordered_node,
2167                                 &cmd->se_dev->ordered_cmd_list);
2168                 spin_unlock(&cmd->se_dev->ordered_cmd_lock);
2169
2170                 atomic_inc(&cmd->se_dev->dev_ordered_sync);
2171                 smp_mb__after_atomic_inc();
2172
2173                 pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
2174                                 " list, se_ordered_id: %u\n",
2175                                 cmd->t_task_cdb[0],
2176                                 cmd->se_ordered_id);
2177                 /*
2178                  * Add ORDERED command to tail of execution queue if
2179                  * no other older commands exist that need to be
2180                  * completed first.
2181                  */
2182                 if (!atomic_read(&cmd->se_dev->simple_cmds))
2183                         return 1;
2184         } else {
2185                 /*
2186                  * For SIMPLE and UNTAGGED Task Attribute commands
2187                  */
2188                 atomic_inc(&cmd->se_dev->simple_cmds);
2189                 smp_mb__after_atomic_inc();
2190         }
2191         /*
2192          * Otherwise if one or more outstanding ORDERED task attribute exist,
2193          * add the dormant task(s) built for the passed struct se_cmd to the
2194          * execution queue and become in Active state for this struct se_device.
2195          */
2196         if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
2197                 /*
2198                  * Otherwise, add cmd w/ tasks to delayed cmd queue that
2199                  * will be drained upon completion of HEAD_OF_QUEUE task.
2200                  */
2201                 spin_lock(&cmd->se_dev->delayed_cmd_lock);
2202                 cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
2203                 list_add_tail(&cmd->se_delayed_node,
2204                                 &cmd->se_dev->delayed_cmd_list);
2205                 spin_unlock(&cmd->se_dev->delayed_cmd_lock);
2206
2207                 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
2208                         " delayed CMD list, se_ordered_id: %u\n",
2209                         cmd->t_task_cdb[0], cmd->sam_task_attr,
2210                         cmd->se_ordered_id);
2211                 /*
2212                  * Return zero to let transport_execute_tasks() know
2213                  * not to add the delayed tasks to the execution list.
2214                  */
2215                 return 0;
2216         }
2217         /*
2218          * Otherwise, no ORDERED task attributes exist..
2219          */
2220         return 1;
2221 }
2222
2223 /*
2224  * Called from fabric module context in transport_generic_new_cmd() and
2225  * transport_generic_process_write()
2226  */
2227 static int transport_execute_tasks(struct se_cmd *cmd)
2228 {
2229         int add_tasks;
2230
2231         if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
2232                 cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
2233                 transport_generic_request_failure(cmd, NULL, 0, 1);
2234                 return 0;
2235         }
2236
2237         /*
2238          * Call transport_cmd_check_stop() to see if a fabric exception
2239          * has occurred that prevents execution.
2240          */
2241         if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
2242                 /*
2243                  * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
2244                  * attribute for the tasks of the received struct se_cmd CDB
2245                  */
2246                 add_tasks = transport_execute_task_attr(cmd);
2247                 if (!add_tasks)
2248                         goto execute_tasks;
2249                 /*
2250                  * This calls transport_add_tasks_from_cmd() to handle
2251                  * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
2252                  * (if enabled) in __transport_add_task_to_execute_queue() and
2253                  * transport_add_task_check_sam_attr().
2254                  */
2255                 transport_add_tasks_from_cmd(cmd);
2256         }
2257         /*
2258          * Kick the execution queue for the cmd associated struct se_device
2259          * storage object.
2260          */
2261 execute_tasks:
2262         __transport_execute_tasks(cmd->se_dev);
2263         return 0;
2264 }
2265
2266 /*
2267  * Called to check struct se_device tcq depth window, and once open pull struct se_task
2268  * from struct se_device->execute_task_list and
2269  *
2270  * Called from transport_processing_thread()
2271  */
2272 static int __transport_execute_tasks(struct se_device *dev)
2273 {
2274         int error;
2275         struct se_cmd *cmd = NULL;
2276         struct se_task *task = NULL;
2277         unsigned long flags;
2278
2279         /*
2280          * Check if there is enough room in the device and HBA queue to send
2281          * struct se_tasks to the selected transport.
2282          */
2283 check_depth:
2284         if (!atomic_read(&dev->depth_left))
2285                 return transport_tcq_window_closed(dev);
2286
2287         dev->dev_tcq_window_closed = 0;
2288
2289         spin_lock_irq(&dev->execute_task_lock);
2290         if (list_empty(&dev->execute_task_list)) {
2291                 spin_unlock_irq(&dev->execute_task_lock);
2292                 return 0;
2293         }
2294         task = list_first_entry(&dev->execute_task_list,
2295                                 struct se_task, t_execute_list);
2296         __transport_remove_task_from_execute_queue(task, dev);
2297         spin_unlock_irq(&dev->execute_task_lock);
2298
2299         atomic_dec(&dev->depth_left);
2300
2301         cmd = task->task_se_cmd;
2302
2303         spin_lock_irqsave(&cmd->t_state_lock, flags);
2304         task->task_flags |= (TF_ACTIVE | TF_SENT);
2305         atomic_inc(&cmd->t_task_cdbs_sent);
2306
2307         if (atomic_read(&cmd->t_task_cdbs_sent) ==
2308             cmd->t_task_list_num)
2309                 atomic_set(&cmd->transport_sent, 1);
2310
2311         transport_start_task_timer(task);
2312         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2313         /*
2314          * The struct se_cmd->transport_emulate_cdb() function pointer is used
2315          * to grab REPORT_LUNS and other CDBs we want to handle before they hit the
2316          * struct se_subsystem_api->do_task() caller below.
2317          */
2318         if (cmd->transport_emulate_cdb) {
2319                 error = cmd->transport_emulate_cdb(cmd);
2320                 if (error != 0) {
2321                         cmd->transport_error_status = error;
2322                         spin_lock_irqsave(&cmd->t_state_lock, flags);
2323                         task->task_flags &= ~TF_ACTIVE;
2324                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2325                         del_timer_sync(&task->task_timer);
2326                         atomic_set(&cmd->transport_sent, 0);
2327                         transport_stop_tasks_for_cmd(cmd);
2328                         transport_generic_request_failure(cmd, dev, 0, 1);
2329                         goto check_depth;
2330                 }
2331                 /*
2332                  * Handle the successful completion for transport_emulate_cdb()
2333                  * for synchronous operation, following SCF_EMULATE_CDB_ASYNC
2334                  * Otherwise the caller is expected to complete the task with
2335                  * proper status.
2336                  */
2337                 if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
2338                         cmd->scsi_status = SAM_STAT_GOOD;
2339                         task->task_scsi_status = GOOD;
2340                         transport_complete_task(task, 1);
2341                 }
2342         } else {
2343                 /*
2344                  * Currently for all virtual TCM plugins including IBLOCK, FILEIO and
2345                  * RAMDISK we use the internal transport_emulate_control_cdb() logic
2346                  * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
2347                  * LUN emulation code.
2348                  *
2349                  * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
2350                  * call ->do_task() directly and let the underlying TCM subsystem plugin
2351                  * code handle the CDB emulation.
2352                  */
2353                 if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
2354                     (!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
2355                         error = transport_emulate_control_cdb(task);
2356                 else
2357                         error = dev->transport->do_task(task);
2358
2359                 if (error != 0) {
2360                         cmd->transport_error_status = error;
2361                         spin_lock_irqsave(&cmd->t_state_lock, flags);
2362                         task->task_flags &= ~TF_ACTIVE;
2363                         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2364                         del_timer_sync(&task->task_timer);
2365                         atomic_set(&cmd->transport_sent, 0);
2366                         transport_stop_tasks_for_cmd(cmd);
2367                         transport_generic_request_failure(cmd, dev, 0, 1);
2368                 }
2369         }
2370
2371         goto check_depth;
2372
2373         return 0;
2374 }
2375
2376 void transport_new_cmd_failure(struct se_cmd *se_cmd)
2377 {
2378         unsigned long flags;
2379         /*
2380          * Any unsolicited data will get dumped for failed command inside of
2381          * the fabric plugin
2382          */
2383         spin_lock_irqsave(&se_cmd->t_state_lock, flags);
2384         se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
2385         se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2386         spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
2387 }
2388
2389 static inline u32 transport_get_sectors_6(
2390         unsigned char *cdb,
2391         struct se_cmd *cmd,
2392         int *ret)
2393 {
2394         struct se_device *dev = cmd->se_dev;
2395
2396         /*
2397          * Assume TYPE_DISK for non struct se_device objects.
2398          * Use 8-bit sector value.
2399          */
2400         if (!dev)
2401                 goto type_disk;
2402
2403         /*
2404          * Use 24-bit allocation length for TYPE_TAPE.
2405          */
2406         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2407                 return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
2408
2409         /*
2410          * Everything else assume TYPE_DISK Sector CDB location.
2411          * Use 8-bit sector value.
2412          */
2413 type_disk:
2414         return (u32)cdb[4];
2415 }
2416
2417 static inline u32 transport_get_sectors_10(
2418         unsigned char *cdb,
2419         struct se_cmd *cmd,
2420         int *ret)
2421 {
2422         struct se_device *dev = cmd->se_dev;
2423
2424         /*
2425          * Assume TYPE_DISK for non struct se_device objects.
2426          * Use 16-bit sector value.
2427          */
2428         if (!dev)
2429                 goto type_disk;
2430
2431         /*
2432          * XXX_10 is not defined in SSC, throw an exception
2433          */
2434         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2435                 *ret = -EINVAL;
2436                 return 0;
2437         }
2438
2439         /*
2440          * Everything else assume TYPE_DISK Sector CDB location.
2441          * Use 16-bit sector value.
2442          */
2443 type_disk:
2444         return (u32)(cdb[7] << 8) + cdb[8];
2445 }
2446
2447 static inline u32 transport_get_sectors_12(
2448         unsigned char *cdb,
2449         struct se_cmd *cmd,
2450         int *ret)
2451 {
2452         struct se_device *dev = cmd->se_dev;
2453
2454         /*
2455          * Assume TYPE_DISK for non struct se_device objects.
2456          * Use 32-bit sector value.
2457          */
2458         if (!dev)
2459                 goto type_disk;
2460
2461         /*
2462          * XXX_12 is not defined in SSC, throw an exception
2463          */
2464         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2465                 *ret = -EINVAL;
2466                 return 0;
2467         }
2468
2469         /*
2470          * Everything else assume TYPE_DISK Sector CDB location.
2471          * Use 32-bit sector value.
2472          */
2473 type_disk:
2474         return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
2475 }
2476
2477 static inline u32 transport_get_sectors_16(
2478         unsigned char *cdb,
2479         struct se_cmd *cmd,
2480         int *ret)
2481 {
2482         struct se_device *dev = cmd->se_dev;
2483
2484         /*
2485          * Assume TYPE_DISK for non struct se_device objects.
2486          * Use 32-bit sector value.
2487          */
2488         if (!dev)
2489                 goto type_disk;
2490
2491         /*
2492          * Use 24-bit allocation length for TYPE_TAPE.
2493          */
2494         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
2495                 return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
2496
2497 type_disk:
2498         return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
2499                     (cdb[12] << 8) + cdb[13];
2500 }
2501
2502 /*
2503  * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
2504  */
2505 static inline u32 transport_get_sectors_32(
2506         unsigned char *cdb,
2507         struct se_cmd *cmd,
2508         int *ret)
2509 {
2510         /*
2511          * Assume TYPE_DISK for non struct se_device objects.
2512          * Use 32-bit sector value.
2513          */
2514         return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
2515                     (cdb[30] << 8) + cdb[31];
2516
2517 }
2518
2519 static inline u32 transport_get_size(
2520         u32 sectors,
2521         unsigned char *cdb,
2522         struct se_cmd *cmd)
2523 {
2524         struct se_device *dev = cmd->se_dev;
2525
2526         if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
2527                 if (cdb[1] & 1) { /* sectors */
2528                         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2529                 } else /* bytes */
2530                         return sectors;
2531         }
2532 #if 0
2533         pr_debug("Returning block_size: %u, sectors: %u == %u for"
2534                         " %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
2535                         dev->se_sub_dev->se_dev_attrib.block_size * sectors,
2536                         dev->transport->name);
2537 #endif
2538         return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
2539 }
2540
2541 static void transport_xor_callback(struct se_cmd *cmd)
2542 {
2543         unsigned char *buf, *addr;
2544         struct scatterlist *sg;
2545         unsigned int offset;
2546         int i;
2547         int count;
2548         /*
2549          * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
2550          *
2551          * 1) read the specified logical block(s);
2552          * 2) transfer logical blocks from the data-out buffer;
2553          * 3) XOR the logical blocks transferred from the data-out buffer with
2554          *    the logical blocks read, storing the resulting XOR data in a buffer;
2555          * 4) if the DISABLE WRITE bit is set to zero, then write the logical
2556          *    blocks transferred from the data-out buffer; and
2557          * 5) transfer the resulting XOR data to the data-in buffer.
2558          */
2559         buf = kmalloc(cmd->data_length, GFP_KERNEL);
2560         if (!buf) {
2561                 pr_err("Unable to allocate xor_callback buf\n");
2562                 return;
2563         }
2564         /*
2565          * Copy the scatterlist WRITE buffer located at cmd->t_data_sg
2566          * into the locally allocated *buf
2567          */
2568         sg_copy_to_buffer(cmd->t_data_sg,
2569                           cmd->t_data_nents,
2570                           buf,
2571                           cmd->data_length);
2572
2573         /*
2574          * Now perform the XOR against the BIDI read memory located at
2575          * cmd->t_mem_bidi_list
2576          */
2577
2578         offset = 0;
2579         for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
2580                 addr = kmap_atomic(sg_page(sg), KM_USER0);
2581                 if (!addr)
2582                         goto out;
2583
2584                 for (i = 0; i < sg->length; i++)
2585                         *(addr + sg->offset + i) ^= *(buf + offset + i);
2586
2587                 offset += sg->length;
2588                 kunmap_atomic(addr, KM_USER0);
2589         }
2590
2591 out:
2592         kfree(buf);
2593 }
2594
2595 /*
2596  * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
2597  */
2598 static int transport_get_sense_data(struct se_cmd *cmd)
2599 {
2600         unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
2601         struct se_device *dev = cmd->se_dev;
2602         struct se_task *task = NULL, *task_tmp;
2603         unsigned long flags;
2604         u32 offset = 0;
2605
2606         WARN_ON(!cmd->se_lun);
2607
2608         if (!dev)
2609                 return 0;
2610
2611         spin_lock_irqsave(&cmd->t_state_lock, flags);
2612         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2613                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2614                 return 0;
2615         }
2616
2617         list_for_each_entry_safe(task, task_tmp,
2618                                 &cmd->t_task_list, t_list) {
2619                 if (!task->task_sense)
2620                         continue;
2621
2622                 if (!dev->transport->get_sense_buffer) {
2623                         pr_err("dev->transport->get_sense_buffer"
2624                                         " is NULL\n");
2625                         continue;
2626                 }
2627
2628                 sense_buffer = dev->transport->get_sense_buffer(task);
2629                 if (!sense_buffer) {
2630                         pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
2631                                 " sense buffer for task with sense\n",
2632                                 cmd->se_tfo->get_task_tag(cmd), task);
2633                         continue;
2634                 }
2635                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2636
2637                 offset = cmd->se_tfo->set_fabric_sense_len(cmd,
2638                                 TRANSPORT_SENSE_BUFFER);
2639
2640                 memcpy(&buffer[offset], sense_buffer,
2641                                 TRANSPORT_SENSE_BUFFER);
2642                 cmd->scsi_status = task->task_scsi_status;
2643                 /* Automatically padded */
2644                 cmd->scsi_sense_length =
2645                                 (TRANSPORT_SENSE_BUFFER + offset);
2646
2647                 pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
2648                                 " and sense\n",
2649                         dev->se_hba->hba_id, dev->transport->name,
2650                                 cmd->scsi_status);
2651                 return 0;
2652         }
2653         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2654
2655         return -1;
2656 }
2657
2658 static int
2659 transport_handle_reservation_conflict(struct se_cmd *cmd)
2660 {
2661         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2662         cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
2663         cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
2664         /*
2665          * For UA Interlock Code 11b, a RESERVATION CONFLICT will
2666          * establish a UNIT ATTENTION with PREVIOUS RESERVATION
2667          * CONFLICT STATUS.
2668          *
2669          * See spc4r17, section 7.4.6 Control Mode Page, Table 349
2670          */
2671         if (cmd->se_sess &&
2672             cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
2673                 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
2674                         cmd->orig_fe_lun, 0x2C,
2675                         ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
2676         return -EINVAL;
2677 }
2678
2679 static inline long long transport_dev_end_lba(struct se_device *dev)
2680 {
2681         return dev->transport->get_blocks(dev) + 1;
2682 }
2683
2684 static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
2685 {
2686         struct se_device *dev = cmd->se_dev;
2687         u32 sectors;
2688
2689         if (dev->transport->get_device_type(dev) != TYPE_DISK)
2690                 return 0;
2691
2692         sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
2693
2694         if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
2695                 pr_err("LBA: %llu Sectors: %u exceeds"
2696                         " transport_dev_end_lba(): %llu\n",
2697                         cmd->t_task_lba, sectors,
2698                         transport_dev_end_lba(dev));
2699                 return -EINVAL;
2700         }
2701
2702         return 0;
2703 }
2704
2705 static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
2706 {
2707         /*
2708          * Determine if the received WRITE_SAME is used to for direct
2709          * passthrough into Linux/SCSI with struct request via TCM/pSCSI
2710          * or we are signaling the use of internal WRITE_SAME + UNMAP=1
2711          * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
2712          */
2713         int passthrough = (dev->transport->transport_type ==
2714                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2715
2716         if (!passthrough) {
2717                 if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
2718                         pr_err("WRITE_SAME PBDATA and LBDATA"
2719                                 " bits not supported for Block Discard"
2720                                 " Emulation\n");
2721                         return -ENOSYS;
2722                 }
2723                 /*
2724                  * Currently for the emulated case we only accept
2725                  * tpws with the UNMAP=1 bit set.
2726                  */
2727                 if (!(flags[0] & 0x08)) {
2728                         pr_err("WRITE_SAME w/o UNMAP bit not"
2729                                 " supported for Block Discard Emulation\n");
2730                         return -ENOSYS;
2731                 }
2732         }
2733
2734         return 0;
2735 }
2736
2737 /*      transport_generic_cmd_sequencer():
2738  *
2739  *      Generic Command Sequencer that should work for most DAS transport
2740  *      drivers.
2741  *
2742  *      Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
2743  *      RX Thread.
2744  *
2745  *      FIXME: Need to support other SCSI OPCODES where as well.
2746  */
2747 static int transport_generic_cmd_sequencer(
2748         struct se_cmd *cmd,
2749         unsigned char *cdb)
2750 {
2751         struct se_device *dev = cmd->se_dev;
2752         struct se_subsystem_dev *su_dev = dev->se_sub_dev;
2753         int ret = 0, sector_ret = 0, passthrough;
2754         u32 sectors = 0, size = 0, pr_reg_type = 0;
2755         u16 service_action;
2756         u8 alua_ascq = 0;
2757         /*
2758          * Check for an existing UNIT ATTENTION condition
2759          */
2760         if (core_scsi3_ua_check(cmd, cdb) < 0) {
2761                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2762                 cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
2763                 return -EINVAL;
2764         }
2765         /*
2766          * Check status of Asymmetric Logical Unit Assignment port
2767          */
2768         ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
2769         if (ret != 0) {
2770                 /*
2771                  * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
2772                  * The ALUA additional sense code qualifier (ASCQ) is determined
2773                  * by the ALUA primary or secondary access state..
2774                  */
2775                 if (ret > 0) {
2776 #if 0
2777                         pr_debug("[%s]: ALUA TG Port not available,"
2778                                 " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
2779                                 cmd->se_tfo->get_fabric_name(), alua_ascq);
2780 #endif
2781                         transport_set_sense_codes(cmd, 0x04, alua_ascq);
2782                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2783                         cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
2784                         return -EINVAL;
2785                 }
2786                 goto out_invalid_cdb_field;
2787         }
2788         /*
2789          * Check status for SPC-3 Persistent Reservations
2790          */
2791         if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
2792                 if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
2793                                         cmd, cdb, pr_reg_type) != 0)
2794                         return transport_handle_reservation_conflict(cmd);
2795                 /*
2796                  * This means the CDB is allowed for the SCSI Initiator port
2797                  * when said port is *NOT* holding the legacy SPC-2 or
2798                  * SPC-3 Persistent Reservation.
2799                  */
2800         }
2801
2802         switch (cdb[0]) {
2803         case READ_6:
2804                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2805                 if (sector_ret)
2806                         goto out_unsupported_cdb;
2807                 size = transport_get_size(sectors, cdb, cmd);
2808                 cmd->t_task_lba = transport_lba_21(cdb);
2809                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2810                 break;
2811         case READ_10:
2812                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2813                 if (sector_ret)
2814                         goto out_unsupported_cdb;
2815                 size = transport_get_size(sectors, cdb, cmd);
2816                 cmd->t_task_lba = transport_lba_32(cdb);
2817                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2818                 break;
2819         case READ_12:
2820                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2821                 if (sector_ret)
2822                         goto out_unsupported_cdb;
2823                 size = transport_get_size(sectors, cdb, cmd);
2824                 cmd->t_task_lba = transport_lba_32(cdb);
2825                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2826                 break;
2827         case READ_16:
2828                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2829                 if (sector_ret)
2830                         goto out_unsupported_cdb;
2831                 size = transport_get_size(sectors, cdb, cmd);
2832                 cmd->t_task_lba = transport_lba_64(cdb);
2833                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2834                 break;
2835         case WRITE_6:
2836                 sectors = transport_get_sectors_6(cdb, cmd, &sector_ret);
2837                 if (sector_ret)
2838                         goto out_unsupported_cdb;
2839                 size = transport_get_size(sectors, cdb, cmd);
2840                 cmd->t_task_lba = transport_lba_21(cdb);
2841                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2842                 break;
2843         case WRITE_10:
2844                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2845                 if (sector_ret)
2846                         goto out_unsupported_cdb;
2847                 size = transport_get_size(sectors, cdb, cmd);
2848                 cmd->t_task_lba = transport_lba_32(cdb);
2849                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2850                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2851                 break;
2852         case WRITE_12:
2853                 sectors = transport_get_sectors_12(cdb, cmd, &sector_ret);
2854                 if (sector_ret)
2855                         goto out_unsupported_cdb;
2856                 size = transport_get_size(sectors, cdb, cmd);
2857                 cmd->t_task_lba = transport_lba_32(cdb);
2858                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2859                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2860                 break;
2861         case WRITE_16:
2862                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
2863                 if (sector_ret)
2864                         goto out_unsupported_cdb;
2865                 size = transport_get_size(sectors, cdb, cmd);
2866                 cmd->t_task_lba = transport_lba_64(cdb);
2867                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2868                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2869                 break;
2870         case XDWRITEREAD_10:
2871                 if ((cmd->data_direction != DMA_TO_DEVICE) ||
2872                     !(cmd->t_tasks_bidi))
2873                         goto out_invalid_cdb_field;
2874                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
2875                 if (sector_ret)
2876                         goto out_unsupported_cdb;
2877                 size = transport_get_size(sectors, cdb, cmd);
2878                 cmd->t_task_lba = transport_lba_32(cdb);
2879                 cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2880                 passthrough = (dev->transport->transport_type ==
2881                                 TRANSPORT_PLUGIN_PHBA_PDEV);
2882                 /*
2883                  * Skip the remaining assignments for TCM/PSCSI passthrough
2884                  */
2885                 if (passthrough)
2886                         break;
2887                 /*
2888                  * Setup BIDI XOR callback to be run during transport_generic_complete_ok()
2889                  */
2890                 cmd->transport_complete_callback = &transport_xor_callback;
2891                 cmd->t_tasks_fua = (cdb[1] & 0x8);
2892                 break;
2893         case VARIABLE_LENGTH_CMD:
2894                 service_action = get_unaligned_be16(&cdb[8]);
2895                 /*
2896                  * Determine if this is TCM/PSCSI device and we should disable
2897                  * internal emulation for this CDB.
2898                  */
2899                 passthrough = (dev->transport->transport_type ==
2900                                         TRANSPORT_PLUGIN_PHBA_PDEV);
2901
2902                 switch (service_action) {
2903                 case XDWRITEREAD_32:
2904                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2905                         if (sector_ret)
2906                                 goto out_unsupported_cdb;
2907                         size = transport_get_size(sectors, cdb, cmd);
2908                         /*
2909                          * Use WRITE_32 and READ_32 opcodes for the emulated
2910                          * XDWRITE_READ_32 logic.
2911                          */
2912                         cmd->t_task_lba = transport_lba_64_ext(cdb);
2913                         cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
2914
2915                         /*
2916                          * Skip the remaining assignments for TCM/PSCSI passthrough
2917                          */
2918                         if (passthrough)
2919                                 break;
2920
2921                         /*
2922                          * Setup BIDI XOR callback to be run during
2923                          * transport_generic_complete_ok()
2924                          */
2925                         cmd->transport_complete_callback = &transport_xor_callback;
2926                         cmd->t_tasks_fua = (cdb[10] & 0x8);
2927                         break;
2928                 case WRITE_SAME_32:
2929                         sectors = transport_get_sectors_32(cdb, cmd, &sector_ret);
2930                         if (sector_ret)
2931                                 goto out_unsupported_cdb;
2932
2933                         if (sectors)
2934                                 size = transport_get_size(1, cdb, cmd);
2935                         else {
2936                                 pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
2937                                        " supported\n");
2938                                 goto out_invalid_cdb_field;
2939                         }
2940
2941                         cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
2942                         cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2943
2944                         if (target_check_write_same_discard(&cdb[10], dev) < 0)
2945                                 goto out_invalid_cdb_field;
2946
2947                         break;
2948                 default:
2949                         pr_err("VARIABLE_LENGTH_CMD service action"
2950                                 " 0x%04x not supported\n", service_action);
2951                         goto out_unsupported_cdb;
2952                 }
2953                 break;
2954         case MAINTENANCE_IN:
2955                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
2956                         /* MAINTENANCE_IN from SCC-2 */
2957                         /*
2958                          * Check for emulated MI_REPORT_TARGET_PGS.
2959                          */
2960                         if (cdb[1] == MI_REPORT_TARGET_PGS) {
2961                                 cmd->transport_emulate_cdb =
2962                                 (su_dev->t10_alua.alua_type ==
2963                                  SPC3_ALUA_EMULATED) ?
2964                                 core_emulate_report_target_port_groups :
2965                                 NULL;
2966                         }
2967                         size = (cdb[6] << 24) | (cdb[7] << 16) |
2968                                (cdb[8] << 8) | cdb[9];
2969                 } else {
2970                         /* GPCMD_SEND_KEY from multi media commands */
2971                         size = (cdb[8] << 8) + cdb[9];
2972                 }
2973                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2974                 break;
2975         case MODE_SELECT:
2976                 size = cdb[4];
2977                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2978                 break;
2979         case MODE_SELECT_10:
2980                 size = (cdb[7] << 8) + cdb[8];
2981                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2982                 break;
2983         case MODE_SENSE:
2984                 size = cdb[4];
2985                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2986                 break;
2987         case MODE_SENSE_10:
2988         case GPCMD_READ_BUFFER_CAPACITY:
2989         case GPCMD_SEND_OPC:
2990         case LOG_SELECT:
2991         case LOG_SENSE:
2992                 size = (cdb[7] << 8) + cdb[8];
2993                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2994                 break;
2995         case READ_BLOCK_LIMITS:
2996                 size = READ_BLOCK_LEN;
2997                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
2998                 break;
2999         case GPCMD_GET_CONFIGURATION:
3000         case GPCMD_READ_FORMAT_CAPACITIES:
3001         case GPCMD_READ_DISC_INFO:
3002         case GPCMD_READ_TRACK_RZONE_INFO:
3003                 size = (cdb[7] << 8) + cdb[8];
3004                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3005                 break;
3006         case PERSISTENT_RESERVE_IN:
3007         case PERSISTENT_RESERVE_OUT:
3008                 cmd->transport_emulate_cdb =
3009                         (su_dev->t10_pr.res_type ==
3010                          SPC3_PERSISTENT_RESERVATIONS) ?
3011                         core_scsi3_emulate_pr : NULL;
3012                 size = (cdb[7] << 8) + cdb[8];
3013                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3014                 break;
3015         case GPCMD_MECHANISM_STATUS:
3016         case GPCMD_READ_DVD_STRUCTURE:
3017                 size = (cdb[8] << 8) + cdb[9];
3018                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3019                 break;
3020         case READ_POSITION:
3021                 size = READ_POSITION_LEN;
3022                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3023                 break;
3024         case MAINTENANCE_OUT:
3025                 if (dev->transport->get_device_type(dev) != TYPE_ROM) {
3026                         /* MAINTENANCE_OUT from SCC-2
3027                          *
3028                          * Check for emulated MO_SET_TARGET_PGS.
3029                          */
3030                         if (cdb[1] == MO_SET_TARGET_PGS) {
3031                                 cmd->transport_emulate_cdb =
3032                                 (su_dev->t10_alua.alua_type ==
3033                                         SPC3_ALUA_EMULATED) ?
3034                                 core_emulate_set_target_port_groups :
3035                                 NULL;
3036                         }
3037
3038                         size = (cdb[6] << 24) | (cdb[7] << 16) |
3039                                (cdb[8] << 8) | cdb[9];
3040                 } else  {
3041                         /* GPCMD_REPORT_KEY from multi media commands */
3042                         size = (cdb[8] << 8) + cdb[9];
3043                 }
3044                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3045                 break;
3046         case INQUIRY:
3047                 size = (cdb[3] << 8) + cdb[4];
3048                 /*
3049                  * Do implict HEAD_OF_QUEUE processing for INQUIRY.
3050                  * See spc4r17 section 5.3
3051                  */
3052                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3053                         cmd->sam_task_attr = MSG_HEAD_TAG;
3054                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3055                 break;
3056         case READ_BUFFER:
3057                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3058                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3059                 break;
3060         case READ_CAPACITY:
3061                 size = READ_CAP_LEN;
3062                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3063                 break;
3064         case READ_MEDIA_SERIAL_NUMBER:
3065         case SECURITY_PROTOCOL_IN:
3066         case SECURITY_PROTOCOL_OUT:
3067                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3068                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3069                 break;
3070         case SERVICE_ACTION_IN:
3071         case ACCESS_CONTROL_IN:
3072         case ACCESS_CONTROL_OUT:
3073         case EXTENDED_COPY:
3074         case READ_ATTRIBUTE:
3075         case RECEIVE_COPY_RESULTS:
3076         case WRITE_ATTRIBUTE:
3077                 size = (cdb[10] << 24) | (cdb[11] << 16) |
3078                        (cdb[12] << 8) | cdb[13];
3079                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3080                 break;
3081         case RECEIVE_DIAGNOSTIC:
3082         case SEND_DIAGNOSTIC:
3083                 size = (cdb[3] << 8) | cdb[4];
3084                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3085                 break;
3086 /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
3087 #if 0
3088         case GPCMD_READ_CD:
3089                 sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3090                 size = (2336 * sectors);
3091                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3092                 break;
3093 #endif
3094         case READ_TOC:
3095                 size = cdb[8];
3096                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3097                 break;
3098         case REQUEST_SENSE:
3099                 size = cdb[4];
3100                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3101                 break;
3102         case READ_ELEMENT_STATUS:
3103                 size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
3104                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3105                 break;
3106         case WRITE_BUFFER:
3107                 size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
3108                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3109                 break;
3110         case RESERVE:
3111         case RESERVE_10:
3112                 /*
3113                  * The SPC-2 RESERVE does not contain a size in the SCSI CDB.
3114                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3115                  */
3116                 if (cdb[0] == RESERVE_10)
3117                         size = (cdb[7] << 8) | cdb[8];
3118                 else
3119                         size = cmd->data_length;
3120
3121                 /*
3122                  * Setup the legacy emulated handler for SPC-2 and
3123                  * >= SPC-3 compatible reservation handling (CRH=1)
3124                  * Otherwise, we assume the underlying SCSI logic is
3125                  * is running in SPC_PASSTHROUGH, and wants reservations
3126                  * emulation disabled.
3127                  */
3128                 cmd->transport_emulate_cdb =
3129                                 (su_dev->t10_pr.res_type !=
3130                                  SPC_PASSTHROUGH) ?
3131                                 core_scsi2_emulate_crh : NULL;
3132                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3133                 break;
3134         case RELEASE:
3135         case RELEASE_10:
3136                 /*
3137                  * The SPC-2 RELEASE does not contain a size in the SCSI CDB.
3138                  * Assume the passthrough or $FABRIC_MOD will tell us about it.
3139                 */
3140                 if (cdb[0] == RELEASE_10)
3141                         size = (cdb[7] << 8) | cdb[8];
3142                 else
3143                         size = cmd->data_length;
3144
3145                 cmd->transport_emulate_cdb =
3146                                 (su_dev->t10_pr.res_type !=
3147                                  SPC_PASSTHROUGH) ?
3148                                 core_scsi2_emulate_crh : NULL;
3149                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3150                 break;
3151         case SYNCHRONIZE_CACHE:
3152         case 0x91: /* SYNCHRONIZE_CACHE_16: */
3153                 /*
3154                  * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
3155                  */
3156                 if (cdb[0] == SYNCHRONIZE_CACHE) {
3157                         sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3158                         cmd->t_task_lba = transport_lba_32(cdb);
3159                 } else {
3160                         sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3161                         cmd->t_task_lba = transport_lba_64(cdb);
3162                 }
3163                 if (sector_ret)
3164                         goto out_unsupported_cdb;
3165
3166                 size = transport_get_size(sectors, cdb, cmd);
3167                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3168
3169                 /*
3170                  * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb()
3171                  */
3172                 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
3173                         break;
3174                 /*
3175                  * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation
3176                  * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks()
3177                  */
3178                 cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC;
3179                 /*
3180                  * Check to ensure that LBA + Range does not exceed past end of
3181                  * device for IBLOCK and FILEIO ->do_sync_cache() backend calls
3182                  */
3183                 if ((cmd->t_task_lba != 0) || (sectors != 0)) {
3184                         if (transport_cmd_get_valid_sectors(cmd) < 0)
3185                                 goto out_invalid_cdb_field;
3186                 }
3187                 break;
3188         case UNMAP:
3189                 size = get_unaligned_be16(&cdb[7]);
3190                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3191                 break;
3192         case WRITE_SAME_16:
3193                 sectors = transport_get_sectors_16(cdb, cmd, &sector_ret);
3194                 if (sector_ret)
3195                         goto out_unsupported_cdb;
3196
3197                 if (sectors)
3198                         size = transport_get_size(1, cdb, cmd);
3199                 else {
3200                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3201                         goto out_invalid_cdb_field;
3202                 }
3203
3204                 cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
3205                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3206
3207                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3208                         goto out_invalid_cdb_field;
3209                 break;
3210         case WRITE_SAME:
3211                 sectors = transport_get_sectors_10(cdb, cmd, &sector_ret);
3212                 if (sector_ret)
3213                         goto out_unsupported_cdb;
3214
3215                 if (sectors)
3216                         size = transport_get_size(1, cdb, cmd);
3217                 else {
3218                         pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
3219                         goto out_invalid_cdb_field;
3220                 }
3221
3222                 cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
3223                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3224                 /*
3225                  * Follow sbcr26 with WRITE_SAME (10) and check for the existence
3226                  * of byte 1 bit 3 UNMAP instead of original reserved field
3227                  */
3228                 if (target_check_write_same_discard(&cdb[1], dev) < 0)
3229                         goto out_invalid_cdb_field;
3230                 break;
3231         case ALLOW_MEDIUM_REMOVAL:
3232         case GPCMD_CLOSE_TRACK:
3233         case ERASE:
3234         case INITIALIZE_ELEMENT_STATUS:
3235         case GPCMD_LOAD_UNLOAD:
3236         case REZERO_UNIT:
3237         case SEEK_10:
3238         case GPCMD_SET_SPEED:
3239         case SPACE:
3240         case START_STOP:
3241         case TEST_UNIT_READY:
3242         case VERIFY:
3243         case WRITE_FILEMARKS:
3244         case MOVE_MEDIUM:
3245                 cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
3246                 break;
3247         case REPORT_LUNS:
3248                 cmd->transport_emulate_cdb =
3249                                 transport_core_report_lun_response;
3250                 size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
3251                 /*
3252                  * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
3253                  * See spc4r17 section 5.3
3254                  */
3255                 if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3256                         cmd->sam_task_attr = MSG_HEAD_TAG;
3257                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
3258                 break;
3259         default:
3260                 pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
3261                         " 0x%02x, sending CHECK_CONDITION.\n",
3262                         cmd->se_tfo->get_fabric_name(), cdb[0]);
3263                 goto out_unsupported_cdb;
3264         }
3265
3266         if (size != cmd->data_length) {
3267                 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
3268                         " %u does not match SCSI CDB Length: %u for SAM Opcode:"
3269                         " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
3270                                 cmd->data_length, size, cdb[0]);
3271
3272                 cmd->cmd_spdtl = size;
3273
3274                 if (cmd->data_direction == DMA_TO_DEVICE) {
3275                         pr_err("Rejecting underflow/overflow"
3276                                         " WRITE data\n");
3277                         goto out_invalid_cdb_field;
3278                 }
3279                 /*
3280                  * Reject READ_* or WRITE_* with overflow/underflow for
3281                  * type SCF_SCSI_DATA_SG_IO_CDB.
3282                  */
3283                 if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512))  {
3284                         pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
3285                                 " CDB on non 512-byte sector setup subsystem"
3286                                 " plugin: %s\n", dev->transport->name);
3287                         /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
3288                         goto out_invalid_cdb_field;
3289                 }
3290
3291                 if (size > cmd->data_length) {
3292                         cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
3293                         cmd->residual_count = (size - cmd->data_length);
3294                 } else {
3295                         cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
3296                         cmd->residual_count = (cmd->data_length - size);
3297                 }
3298                 cmd->data_length = size;
3299         }
3300
3301         /* Let's limit control cdbs to a page, for simplicity's sake. */
3302         if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
3303             size > PAGE_SIZE)
3304                 goto out_invalid_cdb_field;
3305
3306         transport_set_supported_SAM_opcode(cmd);
3307         return ret;
3308
3309 out_unsupported_cdb:
3310         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3311         cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
3312         return -EINVAL;
3313 out_invalid_cdb_field:
3314         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3315         cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
3316         return -EINVAL;
3317 }
3318
3319 /*
3320  * Called from transport_generic_complete_ok() and
3321  * transport_generic_request_failure() to determine which dormant/delayed
3322  * and ordered cmds need to have their tasks added to the execution queue.
3323  */
3324 static void transport_complete_task_attr(struct se_cmd *cmd)
3325 {
3326         struct se_device *dev = cmd->se_dev;
3327         struct se_cmd *cmd_p, *cmd_tmp;
3328         int new_active_tasks = 0;
3329
3330         if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
3331                 atomic_dec(&dev->simple_cmds);
3332                 smp_mb__after_atomic_dec();
3333                 dev->dev_cur_ordered_id++;
3334                 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
3335                         " SIMPLE: %u\n", dev->dev_cur_ordered_id,
3336                         cmd->se_ordered_id);
3337         } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
3338                 atomic_dec(&dev->dev_hoq_count);
3339                 smp_mb__after_atomic_dec();
3340                 dev->dev_cur_ordered_id++;
3341                 pr_debug("Incremented dev_cur_ordered_id: %u for"
3342                         " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
3343                         cmd->se_ordered_id);
3344         } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
3345                 spin_lock(&dev->ordered_cmd_lock);
3346                 list_del(&cmd->se_ordered_node);
3347                 atomic_dec(&dev->dev_ordered_sync);
3348                 smp_mb__after_atomic_dec();
3349                 spin_unlock(&dev->ordered_cmd_lock);
3350
3351                 dev->dev_cur_ordered_id++;
3352                 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
3353                         " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
3354         }
3355         /*
3356          * Process all commands up to the last received
3357          * ORDERED task attribute which requires another blocking
3358          * boundary
3359          */
3360         spin_lock(&dev->delayed_cmd_lock);
3361         list_for_each_entry_safe(cmd_p, cmd_tmp,
3362                         &dev->delayed_cmd_list, se_delayed_node) {
3363
3364                 list_del(&cmd_p->se_delayed_node);
3365                 spin_unlock(&dev->delayed_cmd_lock);
3366
3367                 pr_debug("Calling add_tasks() for"
3368                         " cmd_p: 0x%02x Task Attr: 0x%02x"
3369                         " Dormant -> Active, se_ordered_id: %u\n",
3370                         cmd_p->t_task_cdb[0],
3371                         cmd_p->sam_task_attr, cmd_p->se_ordered_id);
3372
3373                 transport_add_tasks_from_cmd(cmd_p);
3374                 new_active_tasks++;
3375
3376                 spin_lock(&dev->delayed_cmd_lock);
3377                 if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
3378                         break;
3379         }
3380         spin_unlock(&dev->delayed_cmd_lock);
3381         /*
3382          * If new tasks have become active, wake up the transport thread
3383          * to do the processing of the Active tasks.
3384          */
3385         if (new_active_tasks != 0)
3386                 wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
3387 }
3388
3389 static void transport_complete_qf(struct se_cmd *cmd)
3390 {
3391         int ret = 0;
3392
3393         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3394                 transport_complete_task_attr(cmd);
3395
3396         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3397                 ret = cmd->se_tfo->queue_status(cmd);
3398                 if (ret)
3399                         goto out;
3400         }
3401
3402         switch (cmd->data_direction) {
3403         case DMA_FROM_DEVICE:
3404                 ret = cmd->se_tfo->queue_data_in(cmd);
3405                 break;
3406         case DMA_TO_DEVICE:
3407                 if (cmd->t_bidi_data_sg) {
3408                         ret = cmd->se_tfo->queue_data_in(cmd);
3409                         if (ret < 0)
3410                                 break;
3411                 }
3412                 /* Fall through for DMA_TO_DEVICE */
3413         case DMA_NONE:
3414                 ret = cmd->se_tfo->queue_status(cmd);
3415                 break;
3416         default:
3417                 break;
3418         }
3419
3420 out:
3421         if (ret < 0) {
3422                 transport_handle_queue_full(cmd, cmd->se_dev);
3423                 return;
3424         }
3425         transport_lun_remove_cmd(cmd);
3426         transport_cmd_check_stop_to_fabric(cmd);
3427 }
3428
3429 static void transport_handle_queue_full(
3430         struct se_cmd *cmd,
3431         struct se_device *dev)
3432 {
3433         spin_lock_irq(&dev->qf_cmd_lock);
3434         list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
3435         atomic_inc(&dev->dev_qf_count);
3436         smp_mb__after_atomic_inc();
3437         spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
3438
3439         schedule_work(&cmd->se_dev->qf_work_queue);
3440 }
3441
3442 static void transport_generic_complete_ok(struct se_cmd *cmd)
3443 {
3444         int reason = 0, ret;
3445         /*
3446          * Check if we need to move delayed/dormant tasks from cmds on the
3447          * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
3448          * Attribute.
3449          */
3450         if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
3451                 transport_complete_task_attr(cmd);
3452         /*
3453          * Check to schedule QUEUE_FULL work, or execute an existing
3454          * cmd->transport_qf_callback()
3455          */
3456         if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
3457                 schedule_work(&cmd->se_dev->qf_work_queue);
3458
3459         /*
3460          * Check if we need to retrieve a sense buffer from
3461          * the struct se_cmd in question.
3462          */
3463         if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
3464                 if (transport_get_sense_data(cmd) < 0)
3465                         reason = TCM_NON_EXISTENT_LUN;
3466
3467                 /*
3468                  * Only set when an struct se_task->task_scsi_status returned
3469                  * a non GOOD status.
3470                  */
3471                 if (cmd->scsi_status) {
3472                         ret = transport_send_check_condition_and_sense(
3473                                         cmd, reason, 1);
3474                         if (ret == -EAGAIN)
3475                                 goto queue_full;
3476
3477                         transport_lun_remove_cmd(cmd);
3478                         transport_cmd_check_stop_to_fabric(cmd);
3479                         return;
3480                 }
3481         }
3482         /*
3483          * Check for a callback, used by amongst other things
3484          * XDWRITE_READ_10 emulation.
3485          */
3486         if (cmd->transport_complete_callback)
3487                 cmd->transport_complete_callback(cmd);
3488
3489         switch (cmd->data_direction) {
3490         case DMA_FROM_DEVICE:
3491                 spin_lock(&cmd->se_lun->lun_sep_lock);
3492                 if (cmd->se_lun->lun_sep) {
3493                         cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3494                                         cmd->data_length;
3495                 }
3496                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3497
3498                 ret = cmd->se_tfo->queue_data_in(cmd);
3499                 if (ret == -EAGAIN)
3500                         goto queue_full;
3501                 break;
3502         case DMA_TO_DEVICE:
3503                 spin_lock(&cmd->se_lun->lun_sep_lock);
3504                 if (cmd->se_lun->lun_sep) {
3505                         cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
3506                                 cmd->data_length;
3507                 }
3508                 spin_unlock(&cmd->se_lun->lun_sep_lock);
3509                 /*
3510                  * Check if we need to send READ payload for BIDI-COMMAND
3511                  */
3512                 if (cmd->t_bidi_data_sg) {
3513                         spin_lock(&cmd->se_lun->lun_sep_lock);
3514                         if (cmd->se_lun->lun_sep) {
3515                                 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
3516                                         cmd->data_length;
3517                         }
3518                         spin_unlock(&cmd->se_lun->lun_sep_lock);
3519                         ret = cmd->se_tfo->queue_data_in(cmd);
3520                         if (ret == -EAGAIN)
3521                                 goto queue_full;
3522                         break;
3523                 }
3524                 /* Fall through for DMA_TO_DEVICE */
3525         case DMA_NONE:
3526                 ret = cmd->se_tfo->queue_status(cmd);
3527                 if (ret == -EAGAIN)
3528                         goto queue_full;
3529                 break;
3530         default:
3531                 break;
3532         }
3533
3534         transport_lun_remove_cmd(cmd);
3535         transport_cmd_check_stop_to_fabric(cmd);
3536         return;
3537
3538 queue_full:
3539         pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
3540                 " data_direction: %d\n", cmd, cmd->data_direction);
3541         cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
3542         transport_handle_queue_full(cmd, cmd->se_dev);
3543 }
3544
3545 static void transport_free_dev_tasks(struct se_cmd *cmd)
3546 {
3547         struct se_task *task, *task_tmp;
3548         unsigned long flags;
3549         LIST_HEAD(dispose_list);
3550
3551         spin_lock_irqsave(&cmd->t_state_lock, flags);
3552         list_for_each_entry_safe(task, task_tmp,
3553                                 &cmd->t_task_list, t_list) {
3554                 if (!(task->task_flags & TF_ACTIVE))
3555                         list_move_tail(&task->t_list, &dispose_list);
3556         }
3557         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3558
3559         while (!list_empty(&dispose_list)) {
3560                 task = list_first_entry(&dispose_list, struct se_task, t_list);
3561
3562                 /*
3563                  * We already cancelled all pending timers in
3564                  * transport_complete_task, but that was just a pure del_timer,
3565                  * so do a full del_timer_sync here to make sure any handler
3566                  * that was running at that point has finished execution.
3567                  */
3568                 del_timer_sync(&task->task_timer);
3569
3570                 kfree(task->task_sg_bidi);
3571                 kfree(task->task_sg);
3572
3573                 list_del(&task->t_list);
3574
3575                 cmd->se_dev->transport->free_task(task);
3576         }
3577 }
3578
3579 static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
3580 {
3581         struct scatterlist *sg;
3582         int count;
3583
3584         for_each_sg(sgl, sg, nents, count)
3585                 __free_page(sg_page(sg));
3586
3587         kfree(sgl);
3588 }
3589
3590 static inline void transport_free_pages(struct se_cmd *cmd)
3591 {
3592         if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
3593                 return;
3594
3595         transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
3596         cmd->t_data_sg = NULL;
3597         cmd->t_data_nents = 0;
3598
3599         transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
3600         cmd->t_bidi_data_sg = NULL;
3601         cmd->t_bidi_data_nents = 0;
3602 }
3603
3604 /**
3605  * transport_put_cmd - release a reference to a command
3606  * @cmd:       command to release
3607  *
3608  * This routine releases our reference to the command and frees it if possible.
3609  */
3610 static void transport_put_cmd(struct se_cmd *cmd)
3611 {
3612         unsigned long flags;
3613         int free_tasks = 0;
3614
3615         spin_lock_irqsave(&cmd->t_state_lock, flags);
3616         if (atomic_read(&cmd->t_fe_count)) {
3617                 if (!atomic_dec_and_test(&cmd->t_fe_count))
3618                         goto out_busy;
3619         }
3620
3621         if (atomic_read(&cmd->t_se_count)) {
3622                 if (!atomic_dec_and_test(&cmd->t_se_count))
3623                         goto out_busy;
3624         }
3625
3626         if (atomic_read(&cmd->transport_dev_active)) {
3627                 atomic_set(&cmd->transport_dev_active, 0);
3628                 transport_all_task_dev_remove_state(cmd);
3629                 free_tasks = 1;
3630         }
3631         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3632
3633         if (free_tasks != 0)
3634                 transport_free_dev_tasks(cmd);
3635
3636         transport_free_pages(cmd);
3637         transport_release_cmd(cmd);
3638         return;
3639 out_busy:
3640         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3641 }
3642
3643 /*
3644  * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
3645  * allocating in the core.
3646  * @cmd:  Associated se_cmd descriptor
3647  * @mem:  SGL style memory for TCM WRITE / READ
3648  * @sg_mem_num: Number of SGL elements
3649  * @mem_bidi_in: SGL style memory for TCM BIDI READ
3650  * @sg_mem_bidi_num: Number of BIDI READ SGL elements
3651  *
3652  * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
3653  * of parameters.
3654  */
3655 int transport_generic_map_mem_to_cmd(
3656         struct se_cmd *cmd,
3657         struct scatterlist *sgl,
3658         u32 sgl_count,
3659         struct scatterlist *sgl_bidi,
3660         u32 sgl_bidi_count)
3661 {
3662         if (!sgl || !sgl_count)
3663                 return 0;
3664
3665         if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
3666             (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
3667
3668                 cmd->t_data_sg = sgl;
3669                 cmd->t_data_nents = sgl_count;
3670
3671                 if (sgl_bidi && sgl_bidi_count) {
3672                         cmd->t_bidi_data_sg = sgl_bidi;
3673                         cmd->t_bidi_data_nents = sgl_bidi_count;
3674                 }
3675                 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
3676         }
3677
3678         return 0;
3679 }
3680 EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
3681
3682 static int transport_new_cmd_obj(struct se_cmd *cmd)
3683 {
3684         struct se_device *dev = cmd->se_dev;
3685         int set_counts = 1, rc, task_cdbs;
3686
3687         /*
3688          * Setup any BIDI READ tasks and memory from
3689          * cmd->t_mem_bidi_list so the READ struct se_tasks
3690          * are queued first for the non pSCSI passthrough case.
3691          */
3692         if (cmd->t_bidi_data_sg &&
3693             (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) {
3694                 rc = transport_allocate_tasks(cmd,
3695                                               cmd->t_task_lba,
3696                                               DMA_FROM_DEVICE,
3697                                               cmd->t_bidi_data_sg,
3698                                               cmd->t_bidi_data_nents);
3699                 if (rc <= 0) {
3700                         cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3701                         cmd->scsi_sense_reason =
3702                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3703                         return -EINVAL;
3704                 }
3705                 atomic_inc(&cmd->t_fe_count);
3706                 atomic_inc(&cmd->t_se_count);
3707                 set_counts = 0;
3708         }
3709         /*
3710          * Setup the tasks and memory from cmd->t_mem_list
3711          * Note for BIDI transfers this will contain the WRITE payload
3712          */
3713         task_cdbs = transport_allocate_tasks(cmd,
3714                                              cmd->t_task_lba,
3715                                              cmd->data_direction,
3716                                              cmd->t_data_sg,
3717                                              cmd->t_data_nents);
3718         if (task_cdbs <= 0) {
3719                 cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
3720                 cmd->scsi_sense_reason =
3721                         TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3722                 return -EINVAL;
3723         }
3724
3725         if (set_counts) {
3726                 atomic_inc(&cmd->t_fe_count);
3727                 atomic_inc(&cmd->t_se_count);
3728         }
3729
3730         cmd->t_task_list_num = task_cdbs;
3731
3732         atomic_set(&cmd->t_task_cdbs_left, task_cdbs);
3733         atomic_set(&cmd->t_task_cdbs_ex_left, task_cdbs);
3734         atomic_set(&cmd->t_task_cdbs_timeout_left, task_cdbs);
3735         return 0;
3736 }
3737
3738 void *transport_kmap_first_data_page(struct se_cmd *cmd)
3739 {
3740         struct scatterlist *sg = cmd->t_data_sg;
3741
3742         BUG_ON(!sg);
3743         /*
3744          * We need to take into account a possible offset here for fabrics like
3745          * tcm_loop who may be using a contig buffer from the SCSI midlayer for
3746          * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
3747          */
3748         return kmap(sg_page(sg)) + sg->offset;
3749 }
3750 EXPORT_SYMBOL(transport_kmap_first_data_page);
3751
3752 void transport_kunmap_first_data_page(struct se_cmd *cmd)
3753 {
3754         kunmap(sg_page(cmd->t_data_sg));
3755 }
3756 EXPORT_SYMBOL(transport_kunmap_first_data_page);
3757
3758 static int
3759 transport_generic_get_mem(struct se_cmd *cmd)
3760 {
3761         u32 length = cmd->data_length;
3762         unsigned int nents;
3763         struct page *page;
3764         int i = 0;
3765
3766         nents = DIV_ROUND_UP(length, PAGE_SIZE);
3767         cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
3768         if (!cmd->t_data_sg)
3769                 return -ENOMEM;
3770
3771         cmd->t_data_nents = nents;
3772         sg_init_table(cmd->t_data_sg, nents);
3773
3774         while (length) {
3775                 u32 page_len = min_t(u32, length, PAGE_SIZE);
3776                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
3777                 if (!page)
3778                         goto out;
3779
3780                 sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
3781                 length -= page_len;
3782                 i++;
3783         }
3784         return 0;
3785
3786 out:
3787         while (i >= 0) {
3788                 __free_page(sg_page(&cmd->t_data_sg[i]));
3789                 i--;
3790         }
3791         kfree(cmd->t_data_sg);
3792         cmd->t_data_sg = NULL;
3793         return -ENOMEM;
3794 }
3795
3796 /* Reduce sectors if they are too long for the device */
3797 static inline sector_t transport_limit_task_sectors(
3798         struct se_device *dev,
3799         unsigned long long lba,
3800         sector_t sectors)
3801 {
3802         sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
3803
3804         if (dev->transport->get_device_type(dev) == TYPE_DISK)
3805                 if ((lba + sectors) > transport_dev_end_lba(dev))
3806                         sectors = ((transport_dev_end_lba(dev) - lba) + 1);
3807
3808         return sectors;
3809 }
3810
3811
3812 /*
3813  * This function can be used by HW target mode drivers to create a linked
3814  * scatterlist from all contiguously allocated struct se_task->task_sg[].
3815  * This is intended to be called during the completion path by TCM Core
3816  * when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
3817  */
3818 void transport_do_task_sg_chain(struct se_cmd *cmd)
3819 {
3820         struct scatterlist *sg_first = NULL;
3821         struct scatterlist *sg_prev = NULL;
3822         int sg_prev_nents = 0;
3823         struct scatterlist *sg;
3824         struct se_task *task;
3825         u32 chained_nents = 0;
3826         int i;
3827
3828         BUG_ON(!cmd->se_tfo->task_sg_chaining);
3829
3830         /*
3831          * Walk the struct se_task list and setup scatterlist chains
3832          * for each contiguously allocated struct se_task->task_sg[].
3833          */
3834         list_for_each_entry(task, &cmd->t_task_list, t_list) {
3835                 if (!task->task_sg)
3836                         continue;
3837
3838                 if (!sg_first) {
3839                         sg_first = task->task_sg;
3840                         chained_nents = task->task_sg_nents;
3841                 } else {
3842                         sg_chain(sg_prev, sg_prev_nents, task->task_sg);
3843                         chained_nents += task->task_sg_nents;
3844                 }
3845                 /*
3846                  * For the padded tasks, use the extra SGL vector allocated
3847                  * in transport_allocate_data_tasks() for the sg_prev_nents
3848                  * offset into sg_chain() above.
3849                  *
3850                  * We do not need the padding for the last task (or a single
3851                  * task), but in that case we will never use the sg_prev_nents
3852                  * value below which would be incorrect.
3853                  */
3854                 sg_prev_nents = (task->task_sg_nents + 1);
3855                 sg_prev = task->task_sg;
3856         }
3857         /*
3858          * Setup the starting pointer and total t_tasks_sg_linked_no including
3859          * padding SGs for linking and to mark the end.
3860          */
3861         cmd->t_tasks_sg_chained = sg_first;
3862         cmd->t_tasks_sg_chained_no = chained_nents;
3863
3864         pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
3865                 " t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
3866                 cmd->t_tasks_sg_chained_no);
3867
3868         for_each_sg(cmd->t_tasks_sg_chained, sg,
3869                         cmd->t_tasks_sg_chained_no, i) {
3870
3871                 pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
3872                         i, sg, sg_page(sg), sg->length, sg->offset);
3873                 if (sg_is_chain(sg))
3874                         pr_debug("SG: %p sg_is_chain=1\n", sg);
3875                 if (sg_is_last(sg))
3876                         pr_debug("SG: %p sg_is_last=1\n", sg);
3877         }
3878 }
3879 EXPORT_SYMBOL(transport_do_task_sg_chain);
3880
3881 /*
3882  * Break up cmd into chunks transport can handle
3883  */
3884 static int transport_allocate_data_tasks(
3885         struct se_cmd *cmd,
3886         unsigned long long lba,
3887         enum dma_data_direction data_direction,
3888         struct scatterlist *sgl,
3889         unsigned int sgl_nents)
3890 {
3891         struct se_task *task;
3892         struct se_device *dev = cmd->se_dev;
3893         unsigned long flags;
3894         int task_count, i;
3895         sector_t sectors, dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
3896         u32 sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
3897         struct scatterlist *sg;
3898         struct scatterlist *cmd_sg;
3899
3900         WARN_ON(cmd->data_length % sector_size);
3901         sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
3902         task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
3903
3904         cmd_sg = sgl;
3905         for (i = 0; i < task_count; i++) {
3906                 unsigned int task_size, task_sg_nents_padded;
3907                 int count;
3908
3909                 task = transport_generic_get_task(cmd, data_direction);
3910                 if (!task)
3911                         return -ENOMEM;
3912
3913                 task->task_lba = lba;
3914                 task->task_sectors = min(sectors, dev_max_sectors);
3915                 task->task_size = task->task_sectors * sector_size;
3916
3917                 /*
3918                  * This now assumes that passed sg_ents are in PAGE_SIZE chunks
3919                  * in order to calculate the number per task SGL entries
3920                  */
3921                 task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
3922                 /*
3923                  * Check if the fabric module driver is requesting that all
3924                  * struct se_task->task_sg[] be chained together..  If so,
3925                  * then allocate an extra padding SG entry for linking and
3926                  * marking the end of the chained SGL for every task except
3927                  * the last one for (task_count > 1) operation, or skipping
3928                  * the extra padding for the (task_count == 1) case.
3929                  */
3930                 if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
3931                         task_sg_nents_padded = (task->task_sg_nents + 1);
3932                 } else
3933                         task_sg_nents_padded = task->task_sg_nents;
3934
3935                 task->task_sg = kmalloc(sizeof(struct scatterlist) *
3936                                         task_sg_nents_padded, GFP_KERNEL);
3937                 if (!task->task_sg) {
3938                         cmd->se_dev->transport->free_task(task);
3939                         return -ENOMEM;
3940                 }
3941
3942                 sg_init_table(task->task_sg, task_sg_nents_padded);
3943
3944                 task_size = task->task_size;
3945
3946                 /* Build new sgl, only up to task_size */
3947                 for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
3948                         if (cmd_sg->length > task_size)
3949                                 break;
3950
3951                         *sg = *cmd_sg;
3952                         task_size -= cmd_sg->length;
3953                         cmd_sg = sg_next(cmd_sg);
3954                 }
3955
3956                 lba += task->task_sectors;
3957                 sectors -= task->task_sectors;
3958
3959                 spin_lock_irqsave(&cmd->t_state_lock, flags);
3960                 list_add_tail(&task->t_list, &cmd->t_task_list);
3961                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3962         }
3963
3964         return task_count;
3965 }
3966
3967 static int
3968 transport_allocate_control_task(struct se_cmd *cmd)
3969 {
3970         struct se_task *task;
3971         unsigned long flags;
3972
3973         task = transport_generic_get_task(cmd, cmd->data_direction);
3974         if (!task)
3975                 return -ENOMEM;
3976
3977         task->task_sg = kmalloc(sizeof(struct scatterlist) * cmd->t_data_nents,
3978                                 GFP_KERNEL);
3979         if (!task->task_sg) {
3980                 cmd->se_dev->transport->free_task(task);
3981                 return -ENOMEM;
3982         }
3983
3984         memcpy(task->task_sg, cmd->t_data_sg,
3985                sizeof(struct scatterlist) * cmd->t_data_nents);
3986         task->task_size = cmd->data_length;
3987         task->task_sg_nents = cmd->t_data_nents;
3988
3989         spin_lock_irqsave(&cmd->t_state_lock, flags);
3990         list_add_tail(&task->t_list, &cmd->t_task_list);
3991         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3992
3993         /* Success! Return number of tasks allocated */
3994         return 1;
3995 }
3996
3997 static u32 transport_allocate_tasks(
3998         struct se_cmd *cmd,
3999         unsigned long long lba,
4000         enum dma_data_direction data_direction,
4001         struct scatterlist *sgl,
4002         unsigned int sgl_nents)
4003 {
4004         if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
4005                 if (transport_cmd_get_valid_sectors(cmd) < 0)
4006                         return -EINVAL;
4007
4008                 return transport_allocate_data_tasks(cmd, lba, data_direction,
4009                                                      sgl, sgl_nents);
4010         } else
4011                 return transport_allocate_control_task(cmd);
4012
4013 }
4014
4015
4016 /*       transport_generic_new_cmd(): Called from transport_processing_thread()
4017  *
4018  *       Allocate storage transport resources from a set of values predefined
4019  *       by transport_generic_cmd_sequencer() from the iSCSI Target RX process.
4020  *       Any non zero return here is treated as an "out of resource' op here.
4021  */
4022         /*
4023          * Generate struct se_task(s) and/or their payloads for this CDB.
4024          */
4025 int transport_generic_new_cmd(struct se_cmd *cmd)
4026 {
4027         int ret = 0;
4028
4029         /*
4030          * Determine is the TCM fabric module has already allocated physical
4031          * memory, and is directly calling transport_generic_map_mem_to_cmd()
4032          * beforehand.
4033          */
4034         if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
4035             cmd->data_length) {
4036                 ret = transport_generic_get_mem(cmd);
4037                 if (ret < 0)
4038                         return ret;
4039         }
4040         /*
4041          * Call transport_new_cmd_obj() to invoke transport_allocate_tasks() for
4042          * control or data CDB types, and perform the map to backend subsystem
4043          * code from SGL memory allocated here by transport_generic_get_mem(), or
4044          * via pre-existing SGL memory setup explictly by fabric module code with
4045          * transport_generic_map_mem_to_cmd().
4046          */
4047         ret = transport_new_cmd_obj(cmd);
4048         if (ret < 0)
4049                 return ret;
4050         /*
4051          * For WRITEs, let the fabric know its buffer is ready..
4052          * This WRITE struct se_cmd (and all of its associated struct se_task's)
4053          * will be added to the struct se_device execution queue after its WRITE
4054          * data has arrived. (ie: It gets handled by the transport processing
4055          * thread a second time)
4056          */
4057         if (cmd->data_direction == DMA_TO_DEVICE) {
4058                 transport_add_tasks_to_state_queue(cmd);
4059                 return transport_generic_write_pending(cmd);
4060         }
4061         /*
4062          * Everything else but a WRITE, add the struct se_cmd's struct se_task's
4063          * to the execution queue.
4064          */
4065         transport_execute_tasks(cmd);
4066         return 0;
4067 }
4068 EXPORT_SYMBOL(transport_generic_new_cmd);
4069
4070 /*      transport_generic_process_write():
4071  *
4072  *
4073  */
4074 void transport_generic_process_write(struct se_cmd *cmd)
4075 {
4076         transport_execute_tasks(cmd);
4077 }
4078 EXPORT_SYMBOL(transport_generic_process_write);
4079
4080 static void transport_write_pending_qf(struct se_cmd *cmd)
4081 {
4082         if (cmd->se_tfo->write_pending(cmd) == -EAGAIN) {
4083                 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
4084                          cmd);
4085                 transport_handle_queue_full(cmd, cmd->se_dev);
4086         }
4087 }
4088
4089 static int transport_generic_write_pending(struct se_cmd *cmd)
4090 {
4091         unsigned long flags;
4092         int ret;
4093
4094         spin_lock_irqsave(&cmd->t_state_lock, flags);
4095         cmd->t_state = TRANSPORT_WRITE_PENDING;
4096         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4097
4098         /*
4099          * Clear the se_cmd for WRITE_PENDING status in order to set
4100          * cmd->t_transport_active=0 so that transport_generic_handle_data
4101          * can be called from HW target mode interrupt code.  This is safe
4102          * to be called with transport_off=1 before the cmd->se_tfo->write_pending
4103          * because the se_cmd->se_lun pointer is not being cleared.
4104          */
4105         transport_cmd_check_stop(cmd, 1, 0);
4106
4107         /*
4108          * Call the fabric write_pending function here to let the
4109          * frontend know that WRITE buffers are ready.
4110          */
4111         ret = cmd->se_tfo->write_pending(cmd);
4112         if (ret == -EAGAIN)
4113                 goto queue_full;
4114         else if (ret < 0)
4115                 return ret;
4116
4117         return PYX_TRANSPORT_WRITE_PENDING;
4118
4119 queue_full:
4120         pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
4121         cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
4122         transport_handle_queue_full(cmd, cmd->se_dev);
4123         return ret;
4124 }
4125
4126 /**
4127  * transport_release_cmd - free a command
4128  * @cmd:       command to free
4129  *
4130  * This routine unconditionally frees a command, and reference counting
4131  * or list removal must be done in the caller.
4132  */
4133 void transport_release_cmd(struct se_cmd *cmd)
4134 {
4135         BUG_ON(!cmd->se_tfo);
4136
4137         if (cmd->se_tmr_req)
4138                 core_tmr_release_req(cmd->se_tmr_req);
4139         if (cmd->t_task_cdb != cmd->__t_task_cdb)
4140                 kfree(cmd->t_task_cdb);
4141         cmd->se_tfo->release_cmd(cmd);
4142 }
4143 EXPORT_SYMBOL(transport_release_cmd);
4144
4145 void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
4146 {
4147         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
4148                 if (wait_for_tasks && cmd->se_tmr_req)
4149                          transport_wait_for_tasks(cmd);
4150
4151                 transport_release_cmd(cmd);
4152         } else {
4153                 if (wait_for_tasks)
4154                         transport_wait_for_tasks(cmd);
4155
4156                 core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
4157
4158                 if (cmd->se_lun)
4159                         transport_lun_remove_cmd(cmd);
4160
4161                 transport_free_dev_tasks(cmd);
4162
4163                 transport_put_cmd(cmd);
4164         }
4165 }
4166 EXPORT_SYMBOL(transport_generic_free_cmd);
4167
4168 /*      transport_lun_wait_for_tasks():
4169  *
4170  *      Called from ConfigFS context to stop the passed struct se_cmd to allow
4171  *      an struct se_lun to be successfully shutdown.
4172  */
4173 static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
4174 {
4175         unsigned long flags;
4176         int ret;
4177         /*
4178          * If the frontend has already requested this struct se_cmd to
4179          * be stopped, we can safely ignore this struct se_cmd.
4180          */
4181         spin_lock_irqsave(&cmd->t_state_lock, flags);
4182         if (atomic_read(&cmd->t_transport_stop)) {
4183                 atomic_set(&cmd->transport_lun_stop, 0);
4184                 pr_debug("ConfigFS ITT[0x%08x] - t_transport_stop =="
4185                         " TRUE, skipping\n", cmd->se_tfo->get_task_tag(cmd));
4186                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4187                 transport_cmd_check_stop(cmd, 1, 0);
4188                 return -EPERM;
4189         }
4190         atomic_set(&cmd->transport_lun_fe_stop, 1);
4191         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4192
4193         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4194
4195         ret = transport_stop_tasks_for_cmd(cmd);
4196
4197         pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
4198                         " %d\n", cmd, cmd->t_task_list_num, ret);
4199         if (!ret) {
4200                 pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
4201                                 cmd->se_tfo->get_task_tag(cmd));
4202                 wait_for_completion(&cmd->transport_lun_stop_comp);
4203                 pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
4204                                 cmd->se_tfo->get_task_tag(cmd));
4205         }
4206         transport_remove_cmd_from_queue(cmd);
4207
4208         return 0;
4209 }
4210
4211 static void __transport_clear_lun_from_sessions(struct se_lun *lun)
4212 {
4213         struct se_cmd *cmd = NULL;
4214         unsigned long lun_flags, cmd_flags;
4215         /*
4216          * Do exception processing and return CHECK_CONDITION status to the
4217          * Initiator Port.
4218          */
4219         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4220         while (!list_empty(&lun->lun_cmd_list)) {
4221                 cmd = list_first_entry(&lun->lun_cmd_list,
4222                        struct se_cmd, se_lun_node);
4223                 list_del(&cmd->se_lun_node);
4224
4225                 atomic_set(&cmd->transport_lun_active, 0);
4226                 /*
4227                  * This will notify iscsi_target_transport.c:
4228                  * transport_cmd_check_stop() that a LUN shutdown is in
4229                  * progress for the iscsi_cmd_t.
4230                  */
4231                 spin_lock(&cmd->t_state_lock);
4232                 pr_debug("SE_LUN[%d] - Setting cmd->transport"
4233                         "_lun_stop for  ITT: 0x%08x\n",
4234                         cmd->se_lun->unpacked_lun,
4235                         cmd->se_tfo->get_task_tag(cmd));
4236                 atomic_set(&cmd->transport_lun_stop, 1);
4237                 spin_unlock(&cmd->t_state_lock);
4238
4239                 spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4240
4241                 if (!cmd->se_lun) {
4242                         pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
4243                                 cmd->se_tfo->get_task_tag(cmd),
4244                                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
4245                         BUG();
4246                 }
4247                 /*
4248                  * If the Storage engine still owns the iscsi_cmd_t, determine
4249                  * and/or stop its context.
4250                  */
4251                 pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
4252                         "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
4253                         cmd->se_tfo->get_task_tag(cmd));
4254
4255                 if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
4256                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4257                         continue;
4258                 }
4259
4260                 pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
4261                         "_wait_for_tasks(): SUCCESS\n",
4262                         cmd->se_lun->unpacked_lun,
4263                         cmd->se_tfo->get_task_tag(cmd));
4264
4265                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4266                 if (!atomic_read(&cmd->transport_dev_active)) {
4267                         spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4268                         goto check_cond;
4269                 }
4270                 atomic_set(&cmd->transport_dev_active, 0);
4271                 transport_all_task_dev_remove_state(cmd);
4272                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4273
4274                 transport_free_dev_tasks(cmd);
4275                 /*
4276                  * The Storage engine stopped this struct se_cmd before it was
4277                  * send to the fabric frontend for delivery back to the
4278                  * Initiator Node.  Return this SCSI CDB back with an
4279                  * CHECK_CONDITION status.
4280                  */
4281 check_cond:
4282                 transport_send_check_condition_and_sense(cmd,
4283                                 TCM_NON_EXISTENT_LUN, 0);
4284                 /*
4285                  *  If the fabric frontend is waiting for this iscsi_cmd_t to
4286                  * be released, notify the waiting thread now that LU has
4287                  * finished accessing it.
4288                  */
4289                 spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
4290                 if (atomic_read(&cmd->transport_lun_fe_stop)) {
4291                         pr_debug("SE_LUN[%d] - Detected FE stop for"
4292                                 " struct se_cmd: %p ITT: 0x%08x\n",
4293                                 lun->unpacked_lun,
4294                                 cmd, cmd->se_tfo->get_task_tag(cmd));
4295
4296                         spin_unlock_irqrestore(&cmd->t_state_lock,
4297                                         cmd_flags);
4298                         transport_cmd_check_stop(cmd, 1, 0);
4299                         complete(&cmd->transport_lun_fe_stop_comp);
4300                         spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4301                         continue;
4302                 }
4303                 pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
4304                         lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
4305
4306                 spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
4307                 spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
4308         }
4309         spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
4310 }
4311
4312 static int transport_clear_lun_thread(void *p)
4313 {
4314         struct se_lun *lun = (struct se_lun *)p;
4315
4316         __transport_clear_lun_from_sessions(lun);
4317         complete(&lun->lun_shutdown_comp);
4318
4319         return 0;
4320 }
4321
4322 int transport_clear_lun_from_sessions(struct se_lun *lun)
4323 {
4324         struct task_struct *kt;
4325
4326         kt = kthread_run(transport_clear_lun_thread, lun,
4327                         "tcm_cl_%u", lun->unpacked_lun);
4328         if (IS_ERR(kt)) {
4329                 pr_err("Unable to start clear_lun thread\n");
4330                 return PTR_ERR(kt);
4331         }
4332         wait_for_completion(&lun->lun_shutdown_comp);
4333
4334         return 0;
4335 }
4336
4337 /**
4338  * transport_wait_for_tasks - wait for completion to occur
4339  * @cmd:        command to wait
4340  *
4341  * Called from frontend fabric context to wait for storage engine
4342  * to pause and/or release frontend generated struct se_cmd.
4343  */
4344 void transport_wait_for_tasks(struct se_cmd *cmd)
4345 {
4346         unsigned long flags;
4347
4348         spin_lock_irqsave(&cmd->t_state_lock, flags);
4349         if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) {
4350                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4351                 return;
4352         }
4353         /*
4354          * Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
4355          * has been set in transport_set_supported_SAM_opcode().
4356          */
4357         if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) && !cmd->se_tmr_req) {
4358                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4359                 return;
4360         }
4361         /*
4362          * If we are already stopped due to an external event (ie: LUN shutdown)
4363          * sleep until the connection can have the passed struct se_cmd back.
4364          * The cmd->transport_lun_stopped_sem will be upped by
4365          * transport_clear_lun_from_sessions() once the ConfigFS context caller
4366          * has completed its operation on the struct se_cmd.
4367          */
4368         if (atomic_read(&cmd->transport_lun_stop)) {
4369
4370                 pr_debug("wait_for_tasks: Stopping"
4371                         " wait_for_completion(&cmd->t_tasktransport_lun_fe"
4372                         "_stop_comp); for ITT: 0x%08x\n",
4373                         cmd->se_tfo->get_task_tag(cmd));
4374                 /*
4375                  * There is a special case for WRITES where a FE exception +
4376                  * LUN shutdown means ConfigFS context is still sleeping on
4377                  * transport_lun_stop_comp in transport_lun_wait_for_tasks().
4378                  * We go ahead and up transport_lun_stop_comp just to be sure
4379                  * here.
4380                  */
4381                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4382                 complete(&cmd->transport_lun_stop_comp);
4383                 wait_for_completion(&cmd->transport_lun_fe_stop_comp);
4384                 spin_lock_irqsave(&cmd->t_state_lock, flags);
4385
4386                 transport_all_task_dev_remove_state(cmd);
4387                 /*
4388                  * At this point, the frontend who was the originator of this
4389                  * struct se_cmd, now owns the structure and can be released through
4390                  * normal means below.
4391                  */
4392                 pr_debug("wait_for_tasks: Stopped"
4393                         " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
4394                         "stop_comp); for ITT: 0x%08x\n",
4395                         cmd->se_tfo->get_task_tag(cmd));
4396
4397                 atomic_set(&cmd->transport_lun_stop, 0);
4398         }
4399         if (!atomic_read(&cmd->t_transport_active) ||
4400              atomic_read(&cmd->t_transport_aborted)) {
4401                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4402                 return;
4403         }
4404
4405         atomic_set(&cmd->t_transport_stop, 1);
4406
4407         pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
4408                 " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop"
4409                 " = TRUE\n", cmd, cmd->se_tfo->get_task_tag(cmd),
4410                 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
4411                 cmd->deferred_t_state);
4412
4413         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4414
4415         wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
4416
4417         wait_for_completion(&cmd->t_transport_stop_comp);
4418
4419         spin_lock_irqsave(&cmd->t_state_lock, flags);
4420         atomic_set(&cmd->t_transport_active, 0);
4421         atomic_set(&cmd->t_transport_stop, 0);
4422
4423         pr_debug("wait_for_tasks: Stopped wait_for_compltion("
4424                 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
4425                 cmd->se_tfo->get_task_tag(cmd));
4426
4427         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4428 }
4429 EXPORT_SYMBOL(transport_wait_for_tasks);
4430
4431 static int transport_get_sense_codes(
4432         struct se_cmd *cmd,
4433         u8 *asc,
4434         u8 *ascq)
4435 {
4436         *asc = cmd->scsi_asc;
4437         *ascq = cmd->scsi_ascq;
4438
4439         return 0;
4440 }
4441
4442 static int transport_set_sense_codes(
4443         struct se_cmd *cmd,
4444         u8 asc,
4445         u8 ascq)
4446 {
4447         cmd->scsi_asc = asc;
4448         cmd->scsi_ascq = ascq;
4449
4450         return 0;
4451 }
4452
4453 int transport_send_check_condition_and_sense(
4454         struct se_cmd *cmd,
4455         u8 reason,
4456         int from_transport)
4457 {
4458         unsigned char *buffer = cmd->sense_buffer;
4459         unsigned long flags;
4460         int offset;
4461         u8 asc = 0, ascq = 0;
4462
4463         spin_lock_irqsave(&cmd->t_state_lock, flags);
4464         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4465                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4466                 return 0;
4467         }
4468         cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
4469         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4470
4471         if (!reason && from_transport)
4472                 goto after_reason;
4473
4474         if (!from_transport)
4475                 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
4476         /*
4477          * Data Segment and SenseLength of the fabric response PDU.
4478          *
4479          * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
4480          * from include/scsi/scsi_cmnd.h
4481          */
4482         offset = cmd->se_tfo->set_fabric_sense_len(cmd,
4483                                 TRANSPORT_SENSE_BUFFER);
4484         /*
4485          * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
4486          * SENSE KEY values from include/scsi/scsi.h
4487          */
4488         switch (reason) {
4489         case TCM_NON_EXISTENT_LUN:
4490                 /* CURRENT ERROR */
4491                 buffer[offset] = 0x70;
4492                 /* ILLEGAL REQUEST */
4493                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4494                 /* LOGICAL UNIT NOT SUPPORTED */
4495                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
4496                 break;
4497         case TCM_UNSUPPORTED_SCSI_OPCODE:
4498         case TCM_SECTOR_COUNT_TOO_MANY:
4499                 /* CURRENT ERROR */
4500                 buffer[offset] = 0x70;
4501                 /* ILLEGAL REQUEST */
4502                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4503                 /* INVALID COMMAND OPERATION CODE */
4504                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
4505                 break;
4506         case TCM_UNKNOWN_MODE_PAGE:
4507                 /* CURRENT ERROR */
4508                 buffer[offset] = 0x70;
4509                 /* ILLEGAL REQUEST */
4510                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4511                 /* INVALID FIELD IN CDB */
4512                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4513                 break;
4514         case TCM_CHECK_CONDITION_ABORT_CMD:
4515                 /* CURRENT ERROR */
4516                 buffer[offset] = 0x70;
4517                 /* ABORTED COMMAND */
4518                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4519                 /* BUS DEVICE RESET FUNCTION OCCURRED */
4520                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
4521                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
4522                 break;
4523         case TCM_INCORRECT_AMOUNT_OF_DATA:
4524                 /* CURRENT ERROR */
4525                 buffer[offset] = 0x70;
4526                 /* ABORTED COMMAND */
4527                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4528                 /* WRITE ERROR */
4529                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4530                 /* NOT ENOUGH UNSOLICITED DATA */
4531                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
4532                 break;
4533         case TCM_INVALID_CDB_FIELD:
4534                 /* CURRENT ERROR */
4535                 buffer[offset] = 0x70;
4536                 /* ABORTED COMMAND */
4537                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4538                 /* INVALID FIELD IN CDB */
4539                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
4540                 break;
4541         case TCM_INVALID_PARAMETER_LIST:
4542                 /* CURRENT ERROR */
4543                 buffer[offset] = 0x70;
4544                 /* ABORTED COMMAND */
4545                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4546                 /* INVALID FIELD IN PARAMETER LIST */
4547                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
4548                 break;
4549         case TCM_UNEXPECTED_UNSOLICITED_DATA:
4550                 /* CURRENT ERROR */
4551                 buffer[offset] = 0x70;
4552                 /* ABORTED COMMAND */
4553                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4554                 /* WRITE ERROR */
4555                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
4556                 /* UNEXPECTED_UNSOLICITED_DATA */
4557                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
4558                 break;
4559         case TCM_SERVICE_CRC_ERROR:
4560                 /* CURRENT ERROR */
4561                 buffer[offset] = 0x70;
4562                 /* ABORTED COMMAND */
4563                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4564                 /* PROTOCOL SERVICE CRC ERROR */
4565                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
4566                 /* N/A */
4567                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
4568                 break;
4569         case TCM_SNACK_REJECTED:
4570                 /* CURRENT ERROR */
4571                 buffer[offset] = 0x70;
4572                 /* ABORTED COMMAND */
4573                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
4574                 /* READ ERROR */
4575                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
4576                 /* FAILED RETRANSMISSION REQUEST */
4577                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
4578                 break;
4579         case TCM_WRITE_PROTECTED:
4580                 /* CURRENT ERROR */
4581                 buffer[offset] = 0x70;
4582                 /* DATA PROTECT */
4583                 buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
4584                 /* WRITE PROTECTED */
4585                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
4586                 break;
4587         case TCM_CHECK_CONDITION_UNIT_ATTENTION:
4588                 /* CURRENT ERROR */
4589                 buffer[offset] = 0x70;
4590                 /* UNIT ATTENTION */
4591                 buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
4592                 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
4593                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4594                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4595                 break;
4596         case TCM_CHECK_CONDITION_NOT_READY:
4597                 /* CURRENT ERROR */
4598                 buffer[offset] = 0x70;
4599                 /* Not Ready */
4600                 buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
4601                 transport_get_sense_codes(cmd, &asc, &ascq);
4602                 buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
4603                 buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
4604                 break;
4605         case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
4606         default:
4607                 /* CURRENT ERROR */
4608                 buffer[offset] = 0x70;
4609                 /* ILLEGAL REQUEST */
4610                 buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
4611                 /* LOGICAL UNIT COMMUNICATION FAILURE */
4612                 buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
4613                 break;
4614         }
4615         /*
4616          * This code uses linux/include/scsi/scsi.h SAM status codes!
4617          */
4618         cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
4619         /*
4620          * Automatically padded, this value is encoded in the fabric's
4621          * data_length response PDU containing the SCSI defined sense data.
4622          */
4623         cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER + offset;
4624
4625 after_reason:
4626         return cmd->se_tfo->queue_status(cmd);
4627 }
4628 EXPORT_SYMBOL(transport_send_check_condition_and_sense);
4629
4630 int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
4631 {
4632         int ret = 0;
4633
4634         if (atomic_read(&cmd->t_transport_aborted) != 0) {
4635                 if (!send_status ||
4636                      (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
4637                         return 1;
4638 #if 0
4639                 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
4640                         " status for CDB: 0x%02x ITT: 0x%08x\n",
4641                         cmd->t_task_cdb[0],
4642                         cmd->se_tfo->get_task_tag(cmd));
4643 #endif
4644                 cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
4645                 cmd->se_tfo->queue_status(cmd);
4646                 ret = 1;
4647         }
4648         return ret;
4649 }
4650 EXPORT_SYMBOL(transport_check_aborted_status);
4651
4652 void transport_send_task_abort(struct se_cmd *cmd)
4653 {
4654         unsigned long flags;
4655
4656         spin_lock_irqsave(&cmd->t_state_lock, flags);
4657         if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
4658                 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4659                 return;
4660         }
4661         spin_unlock_irqrestore(&cmd->t_state_lock, flags);
4662
4663         /*
4664          * If there are still expected incoming fabric WRITEs, we wait
4665          * until until they have completed before sending a TASK_ABORTED
4666          * response.  This response with TASK_ABORTED status will be
4667          * queued back to fabric module by transport_check_aborted_status().
4668          */
4669         if (cmd->data_direction == DMA_TO_DEVICE) {
4670                 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
4671                         atomic_inc(&cmd->t_transport_aborted);
4672                         smp_mb__after_atomic_inc();
4673                         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4674                         transport_new_cmd_failure(cmd);
4675                         return;
4676                 }
4677         }
4678         cmd->scsi_status = SAM_STAT_TASK_ABORTED;
4679 #if 0
4680         pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
4681                 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
4682                 cmd->se_tfo->get_task_tag(cmd));
4683 #endif
4684         cmd->se_tfo->queue_status(cmd);
4685 }
4686
4687 /*      transport_generic_do_tmr():
4688  *
4689  *
4690  */
4691 int transport_generic_do_tmr(struct se_cmd *cmd)
4692 {
4693         struct se_device *dev = cmd->se_dev;
4694         struct se_tmr_req *tmr = cmd->se_tmr_req;
4695         int ret;
4696
4697         switch (tmr->function) {
4698         case TMR_ABORT_TASK:
4699                 tmr->response = TMR_FUNCTION_REJECTED;
4700                 break;
4701         case TMR_ABORT_TASK_SET:
4702         case TMR_CLEAR_ACA:
4703         case TMR_CLEAR_TASK_SET:
4704                 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
4705                 break;
4706         case TMR_LUN_RESET:
4707                 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
4708                 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
4709                                          TMR_FUNCTION_REJECTED;
4710                 break;
4711         case TMR_TARGET_WARM_RESET:
4712                 tmr->response = TMR_FUNCTION_REJECTED;
4713                 break;
4714         case TMR_TARGET_COLD_RESET:
4715                 tmr->response = TMR_FUNCTION_REJECTED;
4716                 break;
4717         default:
4718                 pr_err("Uknown TMR function: 0x%02x.\n",
4719                                 tmr->function);
4720                 tmr->response = TMR_FUNCTION_REJECTED;
4721                 break;
4722         }
4723
4724         cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
4725         cmd->se_tfo->queue_tm_rsp(cmd);
4726
4727         transport_cmd_check_stop_to_fabric(cmd);
4728         return 0;
4729 }
4730
4731 /*      transport_processing_thread():
4732  *
4733  *
4734  */
4735 static int transport_processing_thread(void *param)
4736 {
4737         int ret;
4738         struct se_cmd *cmd;
4739         struct se_device *dev = (struct se_device *) param;
4740
4741         set_user_nice(current, -20);
4742
4743         while (!kthread_should_stop()) {
4744                 ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
4745                                 atomic_read(&dev->dev_queue_obj.queue_cnt) ||
4746                                 kthread_should_stop());
4747                 if (ret < 0)
4748                         goto out;
4749
4750 get_cmd:
4751                 __transport_execute_tasks(dev);
4752
4753                 cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
4754                 if (!cmd)
4755                         continue;
4756
4757                 switch (cmd->t_state) {
4758                 case TRANSPORT_NEW_CMD:
4759                         BUG();
4760                         break;
4761                 case TRANSPORT_NEW_CMD_MAP:
4762                         if (!cmd->se_tfo->new_cmd_map) {
4763                                 pr_err("cmd->se_tfo->new_cmd_map is"
4764                                         " NULL for TRANSPORT_NEW_CMD_MAP\n");
4765                                 BUG();
4766                         }
4767                         ret = cmd->se_tfo->new_cmd_map(cmd);
4768                         if (ret < 0) {
4769                                 cmd->transport_error_status = ret;
4770                                 transport_generic_request_failure(cmd, NULL,
4771                                                 0, (cmd->data_direction !=
4772                                                     DMA_TO_DEVICE));
4773                                 break;
4774                         }
4775                         ret = transport_generic_new_cmd(cmd);
4776                         if (ret == -EAGAIN)
4777                                 break;
4778                         else if (ret < 0) {
4779                                 cmd->transport_error_status = ret;
4780                                 transport_generic_request_failure(cmd, NULL,
4781                                         0, (cmd->data_direction !=
4782                                          DMA_TO_DEVICE));
4783                         }
4784                         break;
4785                 case TRANSPORT_PROCESS_WRITE:
4786                         transport_generic_process_write(cmd);
4787                         break;
4788                 case TRANSPORT_COMPLETE_OK:
4789                         transport_generic_complete_ok(cmd);
4790                         break;
4791                 case TRANSPORT_REMOVE:
4792                         transport_put_cmd(cmd);
4793                         break;
4794                 case TRANSPORT_FREE_CMD_INTR:
4795                         transport_generic_free_cmd(cmd, 0);
4796                         break;
4797                 case TRANSPORT_PROCESS_TMR:
4798                         transport_generic_do_tmr(cmd);
4799                         break;
4800                 case TRANSPORT_COMPLETE_FAILURE:
4801                         transport_generic_request_failure(cmd, NULL, 1, 1);
4802                         break;
4803                 case TRANSPORT_COMPLETE_TIMEOUT:
4804                         transport_generic_request_timeout(cmd);
4805                         break;
4806                 case TRANSPORT_COMPLETE_QF_WP:
4807                         transport_write_pending_qf(cmd);
4808                         break;
4809                 case TRANSPORT_COMPLETE_QF_OK:
4810                         transport_complete_qf(cmd);
4811                         break;
4812                 default:
4813                         pr_err("Unknown t_state: %d deferred_t_state:"
4814                                 " %d for ITT: 0x%08x i_state: %d on SE LUN:"
4815                                 " %u\n", cmd->t_state, cmd->deferred_t_state,
4816                                 cmd->se_tfo->get_task_tag(cmd),
4817                                 cmd->se_tfo->get_cmd_state(cmd),
4818                                 cmd->se_lun->unpacked_lun);
4819                         BUG();
4820                 }
4821
4822                 goto get_cmd;
4823         }
4824
4825 out:
4826         WARN_ON(!list_empty(&dev->state_task_list));
4827         WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
4828         dev->process_thread = NULL;
4829         return 0;
4830 }