linux/drivers/target/target_core_transport.c
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   1/*******************************************************************************
   2 * Filename:  target_core_transport.c
   3 *
   4 * This file contains the Generic Target Engine Core.
   5 *
   6 * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
   7 * Copyright (c) 2005, 2006, 2007 SBE, Inc.
   8 * Copyright (c) 2007-2010 Rising Tide Systems
   9 * Copyright (c) 2008-2010 Linux-iSCSI.org
  10 *
  11 * Nicholas A. Bellinger <nab@kernel.org>
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 *
  18 * This program is distributed in the hope that it will be useful,
  19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 * GNU General Public License for more details.
  22 *
  23 * You should have received a copy of the GNU General Public License
  24 * along with this program; if not, write to the Free Software
  25 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26 *
  27 ******************************************************************************/
  28
  29#include <linux/net.h>
  30#include <linux/delay.h>
  31#include <linux/string.h>
  32#include <linux/timer.h>
  33#include <linux/slab.h>
  34#include <linux/blkdev.h>
  35#include <linux/spinlock.h>
  36#include <linux/kthread.h>
  37#include <linux/in.h>
  38#include <linux/cdrom.h>
  39#include <linux/module.h>
  40#include <linux/ratelimit.h>
  41#include <asm/unaligned.h>
  42#include <net/sock.h>
  43#include <net/tcp.h>
  44#include <scsi/scsi.h>
  45#include <scsi/scsi_cmnd.h>
  46#include <scsi/scsi_tcq.h>
  47
  48#include <target/target_core_base.h>
  49#include <target/target_core_backend.h>
  50#include <target/target_core_fabric.h>
  51#include <target/target_core_configfs.h>
  52
  53#include "target_core_internal.h"
  54#include "target_core_alua.h"
  55#include "target_core_pr.h"
  56#include "target_core_ua.h"
  57
  58static struct workqueue_struct *target_completion_wq;
  59static struct kmem_cache *se_sess_cache;
  60struct kmem_cache *se_ua_cache;
  61struct kmem_cache *t10_pr_reg_cache;
  62struct kmem_cache *t10_alua_lu_gp_cache;
  63struct kmem_cache *t10_alua_lu_gp_mem_cache;
  64struct kmem_cache *t10_alua_tg_pt_gp_cache;
  65struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
  66
  67static void transport_complete_task_attr(struct se_cmd *cmd);
  68static void transport_handle_queue_full(struct se_cmd *cmd,
  69                struct se_device *dev);
  70static int transport_generic_get_mem(struct se_cmd *cmd);
  71static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
  72static void transport_put_cmd(struct se_cmd *cmd);
  73static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
  74static void target_complete_ok_work(struct work_struct *work);
  75
  76int init_se_kmem_caches(void)
  77{
  78        se_sess_cache = kmem_cache_create("se_sess_cache",
  79                        sizeof(struct se_session), __alignof__(struct se_session),
  80                        0, NULL);
  81        if (!se_sess_cache) {
  82                pr_err("kmem_cache_create() for struct se_session"
  83                                " failed\n");
  84                goto out;
  85        }
  86        se_ua_cache = kmem_cache_create("se_ua_cache",
  87                        sizeof(struct se_ua), __alignof__(struct se_ua),
  88                        0, NULL);
  89        if (!se_ua_cache) {
  90                pr_err("kmem_cache_create() for struct se_ua failed\n");
  91                goto out_free_sess_cache;
  92        }
  93        t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
  94                        sizeof(struct t10_pr_registration),
  95                        __alignof__(struct t10_pr_registration), 0, NULL);
  96        if (!t10_pr_reg_cache) {
  97                pr_err("kmem_cache_create() for struct t10_pr_registration"
  98                                " failed\n");
  99                goto out_free_ua_cache;
 100        }
 101        t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
 102                        sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
 103                        0, NULL);
 104        if (!t10_alua_lu_gp_cache) {
 105                pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
 106                                " failed\n");
 107                goto out_free_pr_reg_cache;
 108        }
 109        t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
 110                        sizeof(struct t10_alua_lu_gp_member),
 111                        __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
 112        if (!t10_alua_lu_gp_mem_cache) {
 113                pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
 114                                "cache failed\n");
 115                goto out_free_lu_gp_cache;
 116        }
 117        t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
 118                        sizeof(struct t10_alua_tg_pt_gp),
 119                        __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
 120        if (!t10_alua_tg_pt_gp_cache) {
 121                pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 122                                "cache failed\n");
 123                goto out_free_lu_gp_mem_cache;
 124        }
 125        t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
 126                        "t10_alua_tg_pt_gp_mem_cache",
 127                        sizeof(struct t10_alua_tg_pt_gp_member),
 128                        __alignof__(struct t10_alua_tg_pt_gp_member),
 129                        0, NULL);
 130        if (!t10_alua_tg_pt_gp_mem_cache) {
 131                pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
 132                                "mem_t failed\n");
 133                goto out_free_tg_pt_gp_cache;
 134        }
 135
 136        target_completion_wq = alloc_workqueue("target_completion",
 137                                               WQ_MEM_RECLAIM, 0);
 138        if (!target_completion_wq)
 139                goto out_free_tg_pt_gp_mem_cache;
 140
 141        return 0;
 142
 143out_free_tg_pt_gp_mem_cache:
 144        kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 145out_free_tg_pt_gp_cache:
 146        kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 147out_free_lu_gp_mem_cache:
 148        kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 149out_free_lu_gp_cache:
 150        kmem_cache_destroy(t10_alua_lu_gp_cache);
 151out_free_pr_reg_cache:
 152        kmem_cache_destroy(t10_pr_reg_cache);
 153out_free_ua_cache:
 154        kmem_cache_destroy(se_ua_cache);
 155out_free_sess_cache:
 156        kmem_cache_destroy(se_sess_cache);
 157out:
 158        return -ENOMEM;
 159}
 160
 161void release_se_kmem_caches(void)
 162{
 163        destroy_workqueue(target_completion_wq);
 164        kmem_cache_destroy(se_sess_cache);
 165        kmem_cache_destroy(se_ua_cache);
 166        kmem_cache_destroy(t10_pr_reg_cache);
 167        kmem_cache_destroy(t10_alua_lu_gp_cache);
 168        kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
 169        kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
 170        kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
 171}
 172
 173/* This code ensures unique mib indexes are handed out. */
 174static DEFINE_SPINLOCK(scsi_mib_index_lock);
 175static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
 176
 177/*
 178 * Allocate a new row index for the entry type specified
 179 */
 180u32 scsi_get_new_index(scsi_index_t type)
 181{
 182        u32 new_index;
 183
 184        BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
 185
 186        spin_lock(&scsi_mib_index_lock);
 187        new_index = ++scsi_mib_index[type];
 188        spin_unlock(&scsi_mib_index_lock);
 189
 190        return new_index;
 191}
 192
 193void transport_subsystem_check_init(void)
 194{
 195        int ret;
 196        static int sub_api_initialized;
 197
 198        if (sub_api_initialized)
 199                return;
 200
 201        ret = request_module("target_core_iblock");
 202        if (ret != 0)
 203                pr_err("Unable to load target_core_iblock\n");
 204
 205        ret = request_module("target_core_file");
 206        if (ret != 0)
 207                pr_err("Unable to load target_core_file\n");
 208
 209        ret = request_module("target_core_pscsi");
 210        if (ret != 0)
 211                pr_err("Unable to load target_core_pscsi\n");
 212
 213        sub_api_initialized = 1;
 214}
 215
 216struct se_session *transport_init_session(void)
 217{
 218        struct se_session *se_sess;
 219
 220        se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
 221        if (!se_sess) {
 222                pr_err("Unable to allocate struct se_session from"
 223                                " se_sess_cache\n");
 224                return ERR_PTR(-ENOMEM);
 225        }
 226        INIT_LIST_HEAD(&se_sess->sess_list);
 227        INIT_LIST_HEAD(&se_sess->sess_acl_list);
 228        INIT_LIST_HEAD(&se_sess->sess_cmd_list);
 229        spin_lock_init(&se_sess->sess_cmd_lock);
 230        kref_init(&se_sess->sess_kref);
 231
 232        return se_sess;
 233}
 234EXPORT_SYMBOL(transport_init_session);
 235
 236/*
 237 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
 238 */
 239void __transport_register_session(
 240        struct se_portal_group *se_tpg,
 241        struct se_node_acl *se_nacl,
 242        struct se_session *se_sess,
 243        void *fabric_sess_ptr)
 244{
 245        unsigned char buf[PR_REG_ISID_LEN];
 246
 247        se_sess->se_tpg = se_tpg;
 248        se_sess->fabric_sess_ptr = fabric_sess_ptr;
 249        /*
 250         * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
 251         *
 252         * Only set for struct se_session's that will actually be moving I/O.
 253         * eg: *NOT* discovery sessions.
 254         */
 255        if (se_nacl) {
 256                /*
 257                 * If the fabric module supports an ISID based TransportID,
 258                 * save this value in binary from the fabric I_T Nexus now.
 259                 */
 260                if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
 261                        memset(&buf[0], 0, PR_REG_ISID_LEN);
 262                        se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
 263                                        &buf[0], PR_REG_ISID_LEN);
 264                        se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
 265                }
 266                kref_get(&se_nacl->acl_kref);
 267
 268                spin_lock_irq(&se_nacl->nacl_sess_lock);
 269                /*
 270                 * The se_nacl->nacl_sess pointer will be set to the
 271                 * last active I_T Nexus for each struct se_node_acl.
 272                 */
 273                se_nacl->nacl_sess = se_sess;
 274
 275                list_add_tail(&se_sess->sess_acl_list,
 276                              &se_nacl->acl_sess_list);
 277                spin_unlock_irq(&se_nacl->nacl_sess_lock);
 278        }
 279        list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
 280
 281        pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
 282                se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
 283}
 284EXPORT_SYMBOL(__transport_register_session);
 285
 286void transport_register_session(
 287        struct se_portal_group *se_tpg,
 288        struct se_node_acl *se_nacl,
 289        struct se_session *se_sess,
 290        void *fabric_sess_ptr)
 291{
 292        unsigned long flags;
 293
 294        spin_lock_irqsave(&se_tpg->session_lock, flags);
 295        __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
 296        spin_unlock_irqrestore(&se_tpg->session_lock, flags);
 297}
 298EXPORT_SYMBOL(transport_register_session);
 299
 300void target_release_session(struct kref *kref)
 301{
 302        struct se_session *se_sess = container_of(kref,
 303                        struct se_session, sess_kref);
 304        struct se_portal_group *se_tpg = se_sess->se_tpg;
 305
 306        se_tpg->se_tpg_tfo->close_session(se_sess);
 307}
 308
 309void target_get_session(struct se_session *se_sess)
 310{
 311        kref_get(&se_sess->sess_kref);
 312}
 313EXPORT_SYMBOL(target_get_session);
 314
 315void target_put_session(struct se_session *se_sess)
 316{
 317        struct se_portal_group *tpg = se_sess->se_tpg;
 318
 319        if (tpg->se_tpg_tfo->put_session != NULL) {
 320                tpg->se_tpg_tfo->put_session(se_sess);
 321                return;
 322        }
 323        kref_put(&se_sess->sess_kref, target_release_session);
 324}
 325EXPORT_SYMBOL(target_put_session);
 326
 327static void target_complete_nacl(struct kref *kref)
 328{
 329        struct se_node_acl *nacl = container_of(kref,
 330                                struct se_node_acl, acl_kref);
 331
 332        complete(&nacl->acl_free_comp);
 333}
 334
 335void target_put_nacl(struct se_node_acl *nacl)
 336{
 337        kref_put(&nacl->acl_kref, target_complete_nacl);
 338}
 339
 340void transport_deregister_session_configfs(struct se_session *se_sess)
 341{
 342        struct se_node_acl *se_nacl;
 343        unsigned long flags;
 344        /*
 345         * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
 346         */
 347        se_nacl = se_sess->se_node_acl;
 348        if (se_nacl) {
 349                spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
 350                if (se_nacl->acl_stop == 0)
 351                        list_del(&se_sess->sess_acl_list);
 352                /*
 353                 * If the session list is empty, then clear the pointer.
 354                 * Otherwise, set the struct se_session pointer from the tail
 355                 * element of the per struct se_node_acl active session list.
 356                 */
 357                if (list_empty(&se_nacl->acl_sess_list))
 358                        se_nacl->nacl_sess = NULL;
 359                else {
 360                        se_nacl->nacl_sess = container_of(
 361                                        se_nacl->acl_sess_list.prev,
 362                                        struct se_session, sess_acl_list);
 363                }
 364                spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
 365        }
 366}
 367EXPORT_SYMBOL(transport_deregister_session_configfs);
 368
 369void transport_free_session(struct se_session *se_sess)
 370{
 371        kmem_cache_free(se_sess_cache, se_sess);
 372}
 373EXPORT_SYMBOL(transport_free_session);
 374
 375void transport_deregister_session(struct se_session *se_sess)
 376{
 377        struct se_portal_group *se_tpg = se_sess->se_tpg;
 378        struct target_core_fabric_ops *se_tfo;
 379        struct se_node_acl *se_nacl;
 380        unsigned long flags;
 381        bool comp_nacl = true;
 382
 383        if (!se_tpg) {
 384                transport_free_session(se_sess);
 385                return;
 386        }
 387        se_tfo = se_tpg->se_tpg_tfo;
 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
 401        spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 402        if (se_nacl && se_nacl->dynamic_node_acl) {
 403                if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
 404                        list_del(&se_nacl->acl_list);
 405                        se_tpg->num_node_acls--;
 406                        spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 407                        core_tpg_wait_for_nacl_pr_ref(se_nacl);
 408                        core_free_device_list_for_node(se_nacl, se_tpg);
 409                        se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
 410
 411                        comp_nacl = false;
 412                        spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
 413                }
 414        }
 415        spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
 416
 417        pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
 418                se_tpg->se_tpg_tfo->get_fabric_name());
 419        /*
 420         * If last kref is dropping now for an explict NodeACL, awake sleeping
 421         * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
 422         * removal context.
 423         */
 424        if (se_nacl && comp_nacl == true)
 425                target_put_nacl(se_nacl);
 426
 427        transport_free_session(se_sess);
 428}
 429EXPORT_SYMBOL(transport_deregister_session);
 430
 431/*
 432 * Called with cmd->t_state_lock held.
 433 */
 434static void target_remove_from_state_list(struct se_cmd *cmd)
 435{
 436        struct se_device *dev = cmd->se_dev;
 437        unsigned long flags;
 438
 439        if (!dev)
 440                return;
 441
 442        if (cmd->transport_state & CMD_T_BUSY)
 443                return;
 444
 445        spin_lock_irqsave(&dev->execute_task_lock, flags);
 446        if (cmd->state_active) {
 447                list_del(&cmd->state_list);
 448                cmd->state_active = false;
 449        }
 450        spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 451}
 452
 453static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 454{
 455        unsigned long flags;
 456
 457        spin_lock_irqsave(&cmd->t_state_lock, flags);
 458        /*
 459         * Determine if IOCTL context caller in requesting the stopping of this
 460         * command for LUN shutdown purposes.
 461         */
 462        if (cmd->transport_state & CMD_T_LUN_STOP) {
 463                pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
 464                        __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 465
 466                cmd->transport_state &= ~CMD_T_ACTIVE;
 467                if (remove_from_lists)
 468                        target_remove_from_state_list(cmd);
 469                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 470
 471                complete(&cmd->transport_lun_stop_comp);
 472                return 1;
 473        }
 474
 475        if (remove_from_lists) {
 476                target_remove_from_state_list(cmd);
 477
 478                /*
 479                 * Clear struct se_cmd->se_lun before the handoff to FE.
 480                 */
 481                cmd->se_lun = NULL;
 482        }
 483
 484        /*
 485         * Determine if frontend context caller is requesting the stopping of
 486         * this command for frontend exceptions.
 487         */
 488        if (cmd->transport_state & CMD_T_STOP) {
 489                pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
 490                        __func__, __LINE__,
 491                        cmd->se_tfo->get_task_tag(cmd));
 492
 493                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 494
 495                complete(&cmd->t_transport_stop_comp);
 496                return 1;
 497        }
 498
 499        cmd->transport_state &= ~CMD_T_ACTIVE;
 500        if (remove_from_lists) {
 501                /*
 502                 * Some fabric modules like tcm_loop can release
 503                 * their internally allocated I/O reference now and
 504                 * struct se_cmd now.
 505                 *
 506                 * Fabric modules are expected to return '1' here if the
 507                 * se_cmd being passed is released at this point,
 508                 * or zero if not being released.
 509                 */
 510                if (cmd->se_tfo->check_stop_free != NULL) {
 511                        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 512                        return cmd->se_tfo->check_stop_free(cmd);
 513                }
 514        }
 515
 516        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 517        return 0;
 518}
 519
 520static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 521{
 522        return transport_cmd_check_stop(cmd, true);
 523}
 524
 525static void transport_lun_remove_cmd(struct se_cmd *cmd)
 526{
 527        struct se_lun *lun = cmd->se_lun;
 528        unsigned long flags;
 529
 530        if (!lun)
 531                return;
 532
 533        spin_lock_irqsave(&cmd->t_state_lock, flags);
 534        if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
 535                cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
 536                target_remove_from_state_list(cmd);
 537        }
 538        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 539
 540        spin_lock_irqsave(&lun->lun_cmd_lock, flags);
 541        if (!list_empty(&cmd->se_lun_node))
 542                list_del_init(&cmd->se_lun_node);
 543        spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
 544}
 545
 546void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 547{
 548        if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
 549                transport_lun_remove_cmd(cmd);
 550
 551        if (transport_cmd_check_stop_to_fabric(cmd))
 552                return;
 553        if (remove)
 554                transport_put_cmd(cmd);
 555}
 556
 557static void target_complete_failure_work(struct work_struct *work)
 558{
 559        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 560
 561        transport_generic_request_failure(cmd);
 562}
 563
 564/*
 565 * Used when asking transport to copy Sense Data from the underlying
 566 * Linux/SCSI struct scsi_cmnd
 567 */
 568static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 569{
 570        struct se_device *dev = cmd->se_dev;
 571
 572        WARN_ON(!cmd->se_lun);
 573
 574        if (!dev)
 575                return NULL;
 576
 577        if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 578                return NULL;
 579
 580        cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
 581
 582        pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
 583                dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 584        return cmd->sense_buffer;
 585}
 586
 587void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 588{
 589        struct se_device *dev = cmd->se_dev;
 590        int success = scsi_status == GOOD;
 591        unsigned long flags;
 592
 593        cmd->scsi_status = scsi_status;
 594
 595
 596        spin_lock_irqsave(&cmd->t_state_lock, flags);
 597        cmd->transport_state &= ~CMD_T_BUSY;
 598
 599        if (dev && dev->transport->transport_complete) {
 600                dev->transport->transport_complete(cmd,
 601                                cmd->t_data_sg,
 602                                transport_get_sense_buffer(cmd));
 603                if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
 604                        success = 1;
 605        }
 606
 607        /*
 608         * See if we are waiting to complete for an exception condition.
 609         */
 610        if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 611                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 612                complete(&cmd->task_stop_comp);
 613                return;
 614        }
 615
 616        if (!success)
 617                cmd->transport_state |= CMD_T_FAILED;
 618
 619        /*
 620         * Check for case where an explict ABORT_TASK has been received
 621         * and transport_wait_for_tasks() will be waiting for completion..
 622         */
 623        if (cmd->transport_state & CMD_T_ABORTED &&
 624            cmd->transport_state & CMD_T_STOP) {
 625                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 626                complete(&cmd->t_transport_stop_comp);
 627                return;
 628        } else if (cmd->transport_state & CMD_T_FAILED) {
 629                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 630                INIT_WORK(&cmd->work, target_complete_failure_work);
 631        } else {
 632                INIT_WORK(&cmd->work, target_complete_ok_work);
 633        }
 634
 635        cmd->t_state = TRANSPORT_COMPLETE;
 636        cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 637        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 638
 639        queue_work(target_completion_wq, &cmd->work);
 640}
 641EXPORT_SYMBOL(target_complete_cmd);
 642
 643static void target_add_to_state_list(struct se_cmd *cmd)
 644{
 645        struct se_device *dev = cmd->se_dev;
 646        unsigned long flags;
 647
 648        spin_lock_irqsave(&dev->execute_task_lock, flags);
 649        if (!cmd->state_active) {
 650                list_add_tail(&cmd->state_list, &dev->state_list);
 651                cmd->state_active = true;
 652        }
 653        spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 654}
 655
 656/*
 657 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 658 */
 659static void transport_write_pending_qf(struct se_cmd *cmd);
 660static void transport_complete_qf(struct se_cmd *cmd);
 661
 662static void target_qf_do_work(struct work_struct *work)
 663{
 664        struct se_device *dev = container_of(work, struct se_device,
 665                                        qf_work_queue);
 666        LIST_HEAD(qf_cmd_list);
 667        struct se_cmd *cmd, *cmd_tmp;
 668
 669        spin_lock_irq(&dev->qf_cmd_lock);
 670        list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 671        spin_unlock_irq(&dev->qf_cmd_lock);
 672
 673        list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 674                list_del(&cmd->se_qf_node);
 675                atomic_dec(&dev->dev_qf_count);
 676                smp_mb__after_atomic_dec();
 677
 678                pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 679                        " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 680                        (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 681                        (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 682                        : "UNKNOWN");
 683
 684                if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 685                        transport_write_pending_qf(cmd);
 686                else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 687                        transport_complete_qf(cmd);
 688        }
 689}
 690
 691unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 692{
 693        switch (cmd->data_direction) {
 694        case DMA_NONE:
 695                return "NONE";
 696        case DMA_FROM_DEVICE:
 697                return "READ";
 698        case DMA_TO_DEVICE:
 699                return "WRITE";
 700        case DMA_BIDIRECTIONAL:
 701                return "BIDI";
 702        default:
 703                break;
 704        }
 705
 706        return "UNKNOWN";
 707}
 708
 709void transport_dump_dev_state(
 710        struct se_device *dev,
 711        char *b,
 712        int *bl)
 713{
 714        *bl += sprintf(b + *bl, "Status: ");
 715        switch (dev->dev_status) {
 716        case TRANSPORT_DEVICE_ACTIVATED:
 717                *bl += sprintf(b + *bl, "ACTIVATED");
 718                break;
 719        case TRANSPORT_DEVICE_DEACTIVATED:
 720                *bl += sprintf(b + *bl, "DEACTIVATED");
 721                break;
 722        case TRANSPORT_DEVICE_SHUTDOWN:
 723                *bl += sprintf(b + *bl, "SHUTDOWN");
 724                break;
 725        case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 726        case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 727                *bl += sprintf(b + *bl, "OFFLINE");
 728                break;
 729        default:
 730                *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 731                break;
 732        }
 733
 734        *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 735        *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 736                dev->se_sub_dev->se_dev_attrib.block_size,
 737                dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 738        *bl += sprintf(b + *bl, "        ");
 739}
 740
 741void transport_dump_vpd_proto_id(
 742        struct t10_vpd *vpd,
 743        unsigned char *p_buf,
 744        int p_buf_len)
 745{
 746        unsigned char buf[VPD_TMP_BUF_SIZE];
 747        int len;
 748
 749        memset(buf, 0, VPD_TMP_BUF_SIZE);
 750        len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 751
 752        switch (vpd->protocol_identifier) {
 753        case 0x00:
 754                sprintf(buf+len, "Fibre Channel\n");
 755                break;
 756        case 0x10:
 757                sprintf(buf+len, "Parallel SCSI\n");
 758                break;
 759        case 0x20:
 760                sprintf(buf+len, "SSA\n");
 761                break;
 762        case 0x30:
 763                sprintf(buf+len, "IEEE 1394\n");
 764                break;
 765        case 0x40:
 766                sprintf(buf+len, "SCSI Remote Direct Memory Access"
 767                                " Protocol\n");
 768                break;
 769        case 0x50:
 770                sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 771                break;
 772        case 0x60:
 773                sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 774                break;
 775        case 0x70:
 776                sprintf(buf+len, "Automation/Drive Interface Transport"
 777                                " Protocol\n");
 778                break;
 779        case 0x80:
 780                sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 781                break;
 782        default:
 783                sprintf(buf+len, "Unknown 0x%02x\n",
 784                                vpd->protocol_identifier);
 785                break;
 786        }
 787
 788        if (p_buf)
 789                strncpy(p_buf, buf, p_buf_len);
 790        else
 791                pr_debug("%s", buf);
 792}
 793
 794void
 795transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 796{
 797        /*
 798         * Check if the Protocol Identifier Valid (PIV) bit is set..
 799         *
 800         * from spc3r23.pdf section 7.5.1
 801         */
 802         if (page_83[1] & 0x80) {
 803                vpd->protocol_identifier = (page_83[0] & 0xf0);
 804                vpd->protocol_identifier_set = 1;
 805                transport_dump_vpd_proto_id(vpd, NULL, 0);
 806        }
 807}
 808EXPORT_SYMBOL(transport_set_vpd_proto_id);
 809
 810int transport_dump_vpd_assoc(
 811        struct t10_vpd *vpd,
 812        unsigned char *p_buf,
 813        int p_buf_len)
 814{
 815        unsigned char buf[VPD_TMP_BUF_SIZE];
 816        int ret = 0;
 817        int len;
 818
 819        memset(buf, 0, VPD_TMP_BUF_SIZE);
 820        len = sprintf(buf, "T10 VPD Identifier Association: ");
 821
 822        switch (vpd->association) {
 823        case 0x00:
 824                sprintf(buf+len, "addressed logical unit\n");
 825                break;
 826        case 0x10:
 827                sprintf(buf+len, "target port\n");
 828                break;
 829        case 0x20:
 830                sprintf(buf+len, "SCSI target device\n");
 831                break;
 832        default:
 833                sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 834                ret = -EINVAL;
 835                break;
 836        }
 837
 838        if (p_buf)
 839                strncpy(p_buf, buf, p_buf_len);
 840        else
 841                pr_debug("%s", buf);
 842
 843        return ret;
 844}
 845
 846int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 847{
 848        /*
 849         * The VPD identification association..
 850         *
 851         * from spc3r23.pdf Section 7.6.3.1 Table 297
 852         */
 853        vpd->association = (page_83[1] & 0x30);
 854        return transport_dump_vpd_assoc(vpd, NULL, 0);
 855}
 856EXPORT_SYMBOL(transport_set_vpd_assoc);
 857
 858int transport_dump_vpd_ident_type(
 859        struct t10_vpd *vpd,
 860        unsigned char *p_buf,
 861        int p_buf_len)
 862{
 863        unsigned char buf[VPD_TMP_BUF_SIZE];
 864        int ret = 0;
 865        int len;
 866
 867        memset(buf, 0, VPD_TMP_BUF_SIZE);
 868        len = sprintf(buf, "T10 VPD Identifier Type: ");
 869
 870        switch (vpd->device_identifier_type) {
 871        case 0x00:
 872                sprintf(buf+len, "Vendor specific\n");
 873                break;
 874        case 0x01:
 875                sprintf(buf+len, "T10 Vendor ID based\n");
 876                break;
 877        case 0x02:
 878                sprintf(buf+len, "EUI-64 based\n");
 879                break;
 880        case 0x03:
 881                sprintf(buf+len, "NAA\n");
 882                break;
 883        case 0x04:
 884                sprintf(buf+len, "Relative target port identifier\n");
 885                break;
 886        case 0x08:
 887                sprintf(buf+len, "SCSI name string\n");
 888                break;
 889        default:
 890                sprintf(buf+len, "Unsupported: 0x%02x\n",
 891                                vpd->device_identifier_type);
 892                ret = -EINVAL;
 893                break;
 894        }
 895
 896        if (p_buf) {
 897                if (p_buf_len < strlen(buf)+1)
 898                        return -EINVAL;
 899                strncpy(p_buf, buf, p_buf_len);
 900        } else {
 901                pr_debug("%s", buf);
 902        }
 903
 904        return ret;
 905}
 906
 907int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 908{
 909        /*
 910         * The VPD identifier type..
 911         *
 912         * from spc3r23.pdf Section 7.6.3.1 Table 298
 913         */
 914        vpd->device_identifier_type = (page_83[1] & 0x0f);
 915        return transport_dump_vpd_ident_type(vpd, NULL, 0);
 916}
 917EXPORT_SYMBOL(transport_set_vpd_ident_type);
 918
 919int transport_dump_vpd_ident(
 920        struct t10_vpd *vpd,
 921        unsigned char *p_buf,
 922        int p_buf_len)
 923{
 924        unsigned char buf[VPD_TMP_BUF_SIZE];
 925        int ret = 0;
 926
 927        memset(buf, 0, VPD_TMP_BUF_SIZE);
 928
 929        switch (vpd->device_identifier_code_set) {
 930        case 0x01: /* Binary */
 931                sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 932                        &vpd->device_identifier[0]);
 933                break;
 934        case 0x02: /* ASCII */
 935                sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 936                        &vpd->device_identifier[0]);
 937                break;
 938        case 0x03: /* UTF-8 */
 939                sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 940                        &vpd->device_identifier[0]);
 941                break;
 942        default:
 943                sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 944                        " 0x%02x", vpd->device_identifier_code_set);
 945                ret = -EINVAL;
 946                break;
 947        }
 948
 949        if (p_buf)
 950                strncpy(p_buf, buf, p_buf_len);
 951        else
 952                pr_debug("%s", buf);
 953
 954        return ret;
 955}
 956
 957int
 958transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 959{
 960        static const char hex_str[] = "0123456789abcdef";
 961        int j = 0, i = 4; /* offset to start of the identifier */
 962
 963        /*
 964         * The VPD Code Set (encoding)
 965         *
 966         * from spc3r23.pdf Section 7.6.3.1 Table 296
 967         */
 968        vpd->device_identifier_code_set = (page_83[0] & 0x0f);
 969        switch (vpd->device_identifier_code_set) {
 970        case 0x01: /* Binary */
 971                vpd->device_identifier[j++] =
 972                                hex_str[vpd->device_identifier_type];
 973                while (i < (4 + page_83[3])) {
 974                        vpd->device_identifier[j++] =
 975                                hex_str[(page_83[i] & 0xf0) >> 4];
 976                        vpd->device_identifier[j++] =
 977                                hex_str[page_83[i] & 0x0f];
 978                        i++;
 979                }
 980                break;
 981        case 0x02: /* ASCII */
 982        case 0x03: /* UTF-8 */
 983                while (i < (4 + page_83[3]))
 984                        vpd->device_identifier[j++] = page_83[i++];
 985                break;
 986        default:
 987                break;
 988        }
 989
 990        return transport_dump_vpd_ident(vpd, NULL, 0);
 991}
 992EXPORT_SYMBOL(transport_set_vpd_ident);
 993
 994static void core_setup_task_attr_emulation(struct se_device *dev)
 995{
 996        /*
 997         * If this device is from Target_Core_Mod/pSCSI, disable the
 998         * SAM Task Attribute emulation.
 999         *
1000         * This is currently not available in upsream Linux/SCSI Target
1001         * mode code, and is assumed to be disabled while using TCM/pSCSI.
1002         */
1003        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1004                dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1005                return;
1006        }
1007
1008        dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1009        pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1010                " device\n", dev->transport->name,
1011                dev->transport->get_device_rev(dev));
1012}
1013
1014static void scsi_dump_inquiry(struct se_device *dev)
1015{
1016        struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1017        char buf[17];
1018        int i, device_type;
1019        /*
1020         * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1021         */
1022        for (i = 0; i < 8; i++)
1023                if (wwn->vendor[i] >= 0x20)
1024                        buf[i] = wwn->vendor[i];
1025                else
1026                        buf[i] = ' ';
1027        buf[i] = '\0';
1028        pr_debug("  Vendor: %s\n", buf);
1029
1030        for (i = 0; i < 16; i++)
1031                if (wwn->model[i] >= 0x20)
1032                        buf[i] = wwn->model[i];
1033                else
1034                        buf[i] = ' ';
1035        buf[i] = '\0';
1036        pr_debug("  Model: %s\n", buf);
1037
1038        for (i = 0; i < 4; i++)
1039                if (wwn->revision[i] >= 0x20)
1040                        buf[i] = wwn->revision[i];
1041                else
1042                        buf[i] = ' ';
1043        buf[i] = '\0';
1044        pr_debug("  Revision: %s\n", buf);
1045
1046        device_type = dev->transport->get_device_type(dev);
1047        pr_debug("  Type:   %s ", scsi_device_type(device_type));
1048        pr_debug("                 ANSI SCSI revision: %02x\n",
1049                                dev->transport->get_device_rev(dev));
1050}
1051
1052struct se_device *transport_add_device_to_core_hba(
1053        struct se_hba *hba,
1054        struct se_subsystem_api *transport,
1055        struct se_subsystem_dev *se_dev,
1056        u32 device_flags,
1057        void *transport_dev,
1058        struct se_dev_limits *dev_limits,
1059        const char *inquiry_prod,
1060        const char *inquiry_rev)
1061{
1062        int force_pt;
1063        struct se_device  *dev;
1064
1065        dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1066        if (!dev) {
1067                pr_err("Unable to allocate memory for se_dev_t\n");
1068                return NULL;
1069        }
1070
1071        dev->dev_flags          = device_flags;
1072        dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1073        dev->dev_ptr            = transport_dev;
1074        dev->se_hba             = hba;
1075        dev->se_sub_dev         = se_dev;
1076        dev->transport          = transport;
1077        INIT_LIST_HEAD(&dev->dev_list);
1078        INIT_LIST_HEAD(&dev->dev_sep_list);
1079        INIT_LIST_HEAD(&dev->dev_tmr_list);
1080        INIT_LIST_HEAD(&dev->delayed_cmd_list);
1081        INIT_LIST_HEAD(&dev->state_list);
1082        INIT_LIST_HEAD(&dev->qf_cmd_list);
1083        spin_lock_init(&dev->execute_task_lock);
1084        spin_lock_init(&dev->delayed_cmd_lock);
1085        spin_lock_init(&dev->dev_reservation_lock);
1086        spin_lock_init(&dev->dev_status_lock);
1087        spin_lock_init(&dev->se_port_lock);
1088        spin_lock_init(&dev->se_tmr_lock);
1089        spin_lock_init(&dev->qf_cmd_lock);
1090        atomic_set(&dev->dev_ordered_id, 0);
1091
1092        se_dev_set_default_attribs(dev, dev_limits);
1093
1094        dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1095        dev->creation_time = get_jiffies_64();
1096        spin_lock_init(&dev->stats_lock);
1097
1098        spin_lock(&hba->device_lock);
1099        list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1100        hba->dev_count++;
1101        spin_unlock(&hba->device_lock);
1102        /*
1103         * Setup the SAM Task Attribute emulation for struct se_device
1104         */
1105        core_setup_task_attr_emulation(dev);
1106        /*
1107         * Force PR and ALUA passthrough emulation with internal object use.
1108         */
1109        force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1110        /*
1111         * Setup the Reservations infrastructure for struct se_device
1112         */
1113        core_setup_reservations(dev, force_pt);
1114        /*
1115         * Setup the Asymmetric Logical Unit Assignment for struct se_device
1116         */
1117        if (core_setup_alua(dev, force_pt) < 0)
1118                goto err_dev_list;
1119
1120        /*
1121         * Startup the struct se_device processing thread
1122         */
1123        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1124                                      dev->transport->name);
1125        if (!dev->tmr_wq) {
1126                pr_err("Unable to create tmr workqueue for %s\n",
1127                        dev->transport->name);
1128                goto err_dev_list;
1129        }
1130        /*
1131         * Setup work_queue for QUEUE_FULL
1132         */
1133        INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1134        /*
1135         * Preload the initial INQUIRY const values if we are doing
1136         * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1137         * passthrough because this is being provided by the backend LLD.
1138         * This is required so that transport_get_inquiry() copies these
1139         * originals once back into DEV_T10_WWN(dev) for the virtual device
1140         * setup.
1141         */
1142        if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1143                if (!inquiry_prod || !inquiry_rev) {
1144                        pr_err("All non TCM/pSCSI plugins require"
1145                                " INQUIRY consts\n");
1146                        goto err_wq;
1147                }
1148
1149                strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1150                strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1151                strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1152        }
1153        scsi_dump_inquiry(dev);
1154
1155        return dev;
1156
1157err_wq:
1158        destroy_workqueue(dev->tmr_wq);
1159err_dev_list:
1160        spin_lock(&hba->device_lock);
1161        list_del(&dev->dev_list);
1162        hba->dev_count--;
1163        spin_unlock(&hba->device_lock);
1164
1165        se_release_vpd_for_dev(dev);
1166
1167        kfree(dev);
1168
1169        return NULL;
1170}
1171EXPORT_SYMBOL(transport_add_device_to_core_hba);
1172
1173int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1174{
1175        struct se_device *dev = cmd->se_dev;
1176
1177        if (cmd->unknown_data_length) {
1178                cmd->data_length = size;
1179        } else if (size != cmd->data_length) {
1180                pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1181                        " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1182                        " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1183                                cmd->data_length, size, cmd->t_task_cdb[0]);
1184
1185                if (cmd->data_direction == DMA_TO_DEVICE) {
1186                        pr_err("Rejecting underflow/overflow"
1187                                        " WRITE data\n");
1188                        goto out_invalid_cdb_field;
1189                }
1190                /*
1191                 * Reject READ_* or WRITE_* with overflow/underflow for
1192                 * type SCF_SCSI_DATA_CDB.
1193                 */
1194                if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1195                        pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1196                                " CDB on non 512-byte sector setup subsystem"
1197                                " plugin: %s\n", dev->transport->name);
1198                        /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1199                        goto out_invalid_cdb_field;
1200                }
1201                /*
1202                 * For the overflow case keep the existing fabric provided
1203                 * ->data_length.  Otherwise for the underflow case, reset
1204                 * ->data_length to the smaller SCSI expected data transfer
1205                 * length.
1206                 */
1207                if (size > cmd->data_length) {
1208                        cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1209                        cmd->residual_count = (size - cmd->data_length);
1210                } else {
1211                        cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1212                        cmd->residual_count = (cmd->data_length - size);
1213                        cmd->data_length = size;
1214                }
1215        }
1216
1217        return 0;
1218
1219out_invalid_cdb_field:
1220        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1221        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1222        return -EINVAL;
1223}
1224
1225/*
1226 * Used by fabric modules containing a local struct se_cmd within their
1227 * fabric dependent per I/O descriptor.
1228 */
1229void transport_init_se_cmd(
1230        struct se_cmd *cmd,
1231        struct target_core_fabric_ops *tfo,
1232        struct se_session *se_sess,
1233        u32 data_length,
1234        int data_direction,
1235        int task_attr,
1236        unsigned char *sense_buffer)
1237{
1238        INIT_LIST_HEAD(&cmd->se_lun_node);
1239        INIT_LIST_HEAD(&cmd->se_delayed_node);
1240        INIT_LIST_HEAD(&cmd->se_qf_node);
1241        INIT_LIST_HEAD(&cmd->se_cmd_list);
1242        INIT_LIST_HEAD(&cmd->state_list);
1243        init_completion(&cmd->transport_lun_fe_stop_comp);
1244        init_completion(&cmd->transport_lun_stop_comp);
1245        init_completion(&cmd->t_transport_stop_comp);
1246        init_completion(&cmd->cmd_wait_comp);
1247        init_completion(&cmd->task_stop_comp);
1248        spin_lock_init(&cmd->t_state_lock);
1249        cmd->transport_state = CMD_T_DEV_ACTIVE;
1250
1251        cmd->se_tfo = tfo;
1252        cmd->se_sess = se_sess;
1253        cmd->data_length = data_length;
1254        cmd->data_direction = data_direction;
1255        cmd->sam_task_attr = task_attr;
1256        cmd->sense_buffer = sense_buffer;
1257
1258        cmd->state_active = false;
1259}
1260EXPORT_SYMBOL(transport_init_se_cmd);
1261
1262static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1263{
1264        /*
1265         * Check if SAM Task Attribute emulation is enabled for this
1266         * struct se_device storage object
1267         */
1268        if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1269                return 0;
1270
1271        if (cmd->sam_task_attr == MSG_ACA_TAG) {
1272                pr_debug("SAM Task Attribute ACA"
1273                        " emulation is not supported\n");
1274                return -EINVAL;
1275        }
1276        /*
1277         * Used to determine when ORDERED commands should go from
1278         * Dormant to Active status.
1279         */
1280        cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1281        smp_mb__after_atomic_inc();
1282        pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1283                        cmd->se_ordered_id, cmd->sam_task_attr,
1284                        cmd->se_dev->transport->name);
1285        return 0;
1286}
1287
1288/*      target_setup_cmd_from_cdb():
1289 *
1290 *      Called from fabric RX Thread.
1291 */
1292int target_setup_cmd_from_cdb(
1293        struct se_cmd *cmd,
1294        unsigned char *cdb)
1295{
1296        struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1297        u32 pr_reg_type = 0;
1298        u8 alua_ascq = 0;
1299        unsigned long flags;
1300        int ret;
1301
1302        /*
1303         * Ensure that the received CDB is less than the max (252 + 8) bytes
1304         * for VARIABLE_LENGTH_CMD
1305         */
1306        if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1307                pr_err("Received SCSI CDB with command_size: %d that"
1308                        " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1309                        scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1310                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1311                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1312                return -EINVAL;
1313        }
1314        /*
1315         * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1316         * allocate the additional extended CDB buffer now..  Otherwise
1317         * setup the pointer from __t_task_cdb to t_task_cdb.
1318         */
1319        if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1320                cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1321                                                GFP_KERNEL);
1322                if (!cmd->t_task_cdb) {
1323                        pr_err("Unable to allocate cmd->t_task_cdb"
1324                                " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1325                                scsi_command_size(cdb),
1326                                (unsigned long)sizeof(cmd->__t_task_cdb));
1327                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1328                        cmd->scsi_sense_reason =
1329                                        TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1330                        return -ENOMEM;
1331                }
1332        } else
1333                cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1334        /*
1335         * Copy the original CDB into cmd->
1336         */
1337        memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1338
1339        /*
1340         * Check for an existing UNIT ATTENTION condition
1341         */
1342        if (core_scsi3_ua_check(cmd, cdb) < 0) {
1343                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1344                cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1345                return -EINVAL;
1346        }
1347
1348        ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1349        if (ret != 0) {
1350                /*
1351                 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1352                 * The ALUA additional sense code qualifier (ASCQ) is determined
1353                 * by the ALUA primary or secondary access state..
1354                 */
1355                if (ret > 0) {
1356                        pr_debug("[%s]: ALUA TG Port not available, "
1357                                "SenseKey: NOT_READY, ASC/ASCQ: "
1358                                "0x04/0x%02x\n",
1359                                cmd->se_tfo->get_fabric_name(), alua_ascq);
1360
1361                        transport_set_sense_codes(cmd, 0x04, alua_ascq);
1362                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1363                        cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1364                        return -EINVAL;
1365                }
1366                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1367                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1368                return -EINVAL;
1369        }
1370
1371        /*
1372         * Check status for SPC-3 Persistent Reservations
1373         */
1374        if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1375                if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1376                                        cmd, cdb, pr_reg_type) != 0) {
1377                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1378                        cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1379                        cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1380                        cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1381                        return -EBUSY;
1382                }
1383                /*
1384                 * This means the CDB is allowed for the SCSI Initiator port
1385                 * when said port is *NOT* holding the legacy SPC-2 or
1386                 * SPC-3 Persistent Reservation.
1387                 */
1388        }
1389
1390        ret = cmd->se_dev->transport->parse_cdb(cmd);
1391        if (ret < 0)
1392                return ret;
1393
1394        spin_lock_irqsave(&cmd->t_state_lock, flags);
1395        cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1396        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1397
1398        /*
1399         * Check for SAM Task Attribute Emulation
1400         */
1401        if (transport_check_alloc_task_attr(cmd) < 0) {
1402                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1403                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1404                return -EINVAL;
1405        }
1406        spin_lock(&cmd->se_lun->lun_sep_lock);
1407        if (cmd->se_lun->lun_sep)
1408                cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1409        spin_unlock(&cmd->se_lun->lun_sep_lock);
1410        return 0;
1411}
1412EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1413
1414/*
1415 * Used by fabric module frontends to queue tasks directly.
1416 * Many only be used from process context only
1417 */
1418int transport_handle_cdb_direct(
1419        struct se_cmd *cmd)
1420{
1421        int ret;
1422
1423        if (!cmd->se_lun) {
1424                dump_stack();
1425                pr_err("cmd->se_lun is NULL\n");
1426                return -EINVAL;
1427        }
1428        if (in_interrupt()) {
1429                dump_stack();
1430                pr_err("transport_generic_handle_cdb cannot be called"
1431                                " from interrupt context\n");
1432                return -EINVAL;
1433        }
1434        /*
1435         * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1436         * outstanding descriptors are handled correctly during shutdown via
1437         * transport_wait_for_tasks()
1438         *
1439         * Also, we don't take cmd->t_state_lock here as we only expect
1440         * this to be called for initial descriptor submission.
1441         */
1442        cmd->t_state = TRANSPORT_NEW_CMD;
1443        cmd->transport_state |= CMD_T_ACTIVE;
1444
1445        /*
1446         * transport_generic_new_cmd() is already handling QUEUE_FULL,
1447         * so follow TRANSPORT_NEW_CMD processing thread context usage
1448         * and call transport_generic_request_failure() if necessary..
1449         */
1450        ret = transport_generic_new_cmd(cmd);
1451        if (ret < 0)
1452                transport_generic_request_failure(cmd);
1453
1454        return 0;
1455}
1456EXPORT_SYMBOL(transport_handle_cdb_direct);
1457
1458/*
1459 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1460 *                       se_cmd + use pre-allocated SGL memory.
1461 *
1462 * @se_cmd: command descriptor to submit
1463 * @se_sess: associated se_sess for endpoint
1464 * @cdb: pointer to SCSI CDB
1465 * @sense: pointer to SCSI sense buffer
1466 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1467 * @data_length: fabric expected data transfer length
1468 * @task_addr: SAM task attribute
1469 * @data_dir: DMA data direction
1470 * @flags: flags for command submission from target_sc_flags_tables
1471 * @sgl: struct scatterlist memory for unidirectional mapping
1472 * @sgl_count: scatterlist count for unidirectional mapping
1473 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1474 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1475 *
1476 * Returns non zero to signal active I/O shutdown failure.  All other
1477 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1478 * but still return zero here.
1479 *
1480 * This may only be called from process context, and also currently
1481 * assumes internal allocation of fabric payload buffer by target-core.
1482 */
1483int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1484                unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1485                u32 data_length, int task_attr, int data_dir, int flags,
1486                struct scatterlist *sgl, u32 sgl_count,
1487                struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1488{
1489        struct se_portal_group *se_tpg;
1490        int rc;
1491
1492        se_tpg = se_sess->se_tpg;
1493        BUG_ON(!se_tpg);
1494        BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1495        BUG_ON(in_interrupt());
1496        /*
1497         * Initialize se_cmd for target operation.  From this point
1498         * exceptions are handled by sending exception status via
1499         * target_core_fabric_ops->queue_status() callback
1500         */
1501        transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1502                                data_length, data_dir, task_attr, sense);
1503        if (flags & TARGET_SCF_UNKNOWN_SIZE)
1504                se_cmd->unknown_data_length = 1;
1505        /*
1506         * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1507         * se_sess->sess_cmd_list.  A second kref_get here is necessary
1508         * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1509         * kref_put() to happen during fabric packet acknowledgement.
1510         */
1511        rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1512        if (rc)
1513                return rc;
1514        /*
1515         * Signal bidirectional data payloads to target-core
1516         */
1517        if (flags & TARGET_SCF_BIDI_OP)
1518                se_cmd->se_cmd_flags |= SCF_BIDI;
1519        /*
1520         * Locate se_lun pointer and attach it to struct se_cmd
1521         */
1522        if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1523                transport_send_check_condition_and_sense(se_cmd,
1524                                se_cmd->scsi_sense_reason, 0);
1525                target_put_sess_cmd(se_sess, se_cmd);
1526                return 0;
1527        }
1528
1529        rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1530        if (rc != 0) {
1531                transport_generic_request_failure(se_cmd);
1532                return 0;
1533        }
1534        /*
1535         * When a non zero sgl_count has been passed perform SGL passthrough
1536         * mapping for pre-allocated fabric memory instead of having target
1537         * core perform an internal SGL allocation..
1538         */
1539        if (sgl_count != 0) {
1540                BUG_ON(!sgl);
1541
1542                /*
1543                 * A work-around for tcm_loop as some userspace code via
1544                 * scsi-generic do not memset their associated read buffers,
1545                 * so go ahead and do that here for type non-data CDBs.  Also
1546                 * note that this is currently guaranteed to be a single SGL
1547                 * for this case by target core in target_setup_cmd_from_cdb()
1548                 * -> transport_generic_cmd_sequencer().
1549                 */
1550                if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1551                     se_cmd->data_direction == DMA_FROM_DEVICE) {
1552                        unsigned char *buf = NULL;
1553
1554                        if (sgl)
1555                                buf = kmap(sg_page(sgl)) + sgl->offset;
1556
1557                        if (buf) {
1558                                memset(buf, 0, sgl->length);
1559                                kunmap(sg_page(sgl));
1560                        }
1561                }
1562
1563                rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1564                                sgl_bidi, sgl_bidi_count);
1565                if (rc != 0) {
1566                        transport_generic_request_failure(se_cmd);
1567                        return 0;
1568                }
1569        }
1570        /*
1571         * Check if we need to delay processing because of ALUA
1572         * Active/NonOptimized primary access state..
1573         */
1574        core_alua_check_nonop_delay(se_cmd);
1575
1576        transport_handle_cdb_direct(se_cmd);
1577        return 0;
1578}
1579EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1580
1581/*
1582 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1583 *
1584 * @se_cmd: command descriptor to submit
1585 * @se_sess: associated se_sess for endpoint
1586 * @cdb: pointer to SCSI CDB
1587 * @sense: pointer to SCSI sense buffer
1588 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1589 * @data_length: fabric expected data transfer length
1590 * @task_addr: SAM task attribute
1591 * @data_dir: DMA data direction
1592 * @flags: flags for command submission from target_sc_flags_tables
1593 *
1594 * Returns non zero to signal active I/O shutdown failure.  All other
1595 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1596 * but still return zero here.
1597 *
1598 * This may only be called from process context, and also currently
1599 * assumes internal allocation of fabric payload buffer by target-core.
1600 *
1601 * It also assumes interal target core SGL memory allocation.
1602 */
1603int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1604                unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1605                u32 data_length, int task_attr, int data_dir, int flags)
1606{
1607        return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1608                        unpacked_lun, data_length, task_attr, data_dir,
1609                        flags, NULL, 0, NULL, 0);
1610}
1611EXPORT_SYMBOL(target_submit_cmd);
1612
1613static void target_complete_tmr_failure(struct work_struct *work)
1614{
1615        struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1616
1617        se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1618        se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1619}
1620
1621/**
1622 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1623 *                     for TMR CDBs
1624 *
1625 * @se_cmd: command descriptor to submit
1626 * @se_sess: associated se_sess for endpoint
1627 * @sense: pointer to SCSI sense buffer
1628 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1629 * @fabric_context: fabric context for TMR req
1630 * @tm_type: Type of TM request
1631 * @gfp: gfp type for caller
1632 * @tag: referenced task tag for TMR_ABORT_TASK
1633 * @flags: submit cmd flags
1634 *
1635 * Callable from all contexts.
1636 **/
1637
1638int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
1639                unsigned char *sense, u32 unpacked_lun,
1640                void *fabric_tmr_ptr, unsigned char tm_type,
1641                gfp_t gfp, unsigned int tag, int flags)
1642{
1643        struct se_portal_group *se_tpg;
1644        int ret;
1645
1646        se_tpg = se_sess->se_tpg;
1647        BUG_ON(!se_tpg);
1648
1649        transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1650                              0, DMA_NONE, MSG_SIMPLE_TAG, sense);
1651        /*
1652         * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1653         * allocation failure.
1654         */
1655        ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
1656        if (ret < 0)
1657                return -ENOMEM;
1658
1659        if (tm_type == TMR_ABORT_TASK)
1660                se_cmd->se_tmr_req->ref_task_tag = tag;
1661
1662        /* See target_submit_cmd for commentary */
1663        ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1664        if (ret) {
1665                core_tmr_release_req(se_cmd->se_tmr_req);
1666                return ret;
1667        }
1668
1669        ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1670        if (ret) {
1671                /*
1672                 * For callback during failure handling, push this work off
1673                 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1674                 */
1675                INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1676                schedule_work(&se_cmd->work);
1677                return 0;
1678        }
1679        transport_generic_handle_tmr(se_cmd);
1680        return 0;
1681}
1682EXPORT_SYMBOL(target_submit_tmr);
1683
1684/*
1685 * If the cmd is active, request it to be stopped and sleep until it
1686 * has completed.
1687 */
1688bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
1689{
1690        bool was_active = false;
1691
1692        if (cmd->transport_state & CMD_T_BUSY) {
1693                cmd->transport_state |= CMD_T_REQUEST_STOP;
1694                spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1695
1696                pr_debug("cmd %p waiting to complete\n", cmd);
1697                wait_for_completion(&cmd->task_stop_comp);
1698                pr_debug("cmd %p stopped successfully\n", cmd);
1699
1700                spin_lock_irqsave(&cmd->t_state_lock, *flags);
1701                cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1702                cmd->transport_state &= ~CMD_T_BUSY;
1703                was_active = true;
1704        }
1705
1706        return was_active;
1707}
1708
1709/*
1710 * Handle SAM-esque emulation for generic transport request failures.
1711 */
1712void transport_generic_request_failure(struct se_cmd *cmd)
1713{
1714        int ret = 0;
1715
1716        pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
1717                " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
1718                cmd->t_task_cdb[0]);
1719        pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
1720                cmd->se_tfo->get_cmd_state(cmd),
1721                cmd->t_state, cmd->scsi_sense_reason);
1722        pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
1723                (cmd->transport_state & CMD_T_ACTIVE) != 0,
1724                (cmd->transport_state & CMD_T_STOP) != 0,
1725                (cmd->transport_state & CMD_T_SENT) != 0);
1726
1727        /*
1728         * For SAM Task Attribute emulation for failed struct se_cmd
1729         */
1730        if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1731                transport_complete_task_attr(cmd);
1732
1733        switch (cmd->scsi_sense_reason) {
1734        case TCM_NON_EXISTENT_LUN:
1735        case TCM_UNSUPPORTED_SCSI_OPCODE:
1736        case TCM_INVALID_CDB_FIELD:
1737        case TCM_INVALID_PARAMETER_LIST:
1738        case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1739        case TCM_UNKNOWN_MODE_PAGE:
1740        case TCM_WRITE_PROTECTED:
1741        case TCM_ADDRESS_OUT_OF_RANGE:
1742        case TCM_CHECK_CONDITION_ABORT_CMD:
1743        case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1744        case TCM_CHECK_CONDITION_NOT_READY:
1745                break;
1746        case TCM_RESERVATION_CONFLICT:
1747                /*
1748                 * No SENSE Data payload for this case, set SCSI Status
1749                 * and queue the response to $FABRIC_MOD.
1750                 *
1751                 * Uses linux/include/scsi/scsi.h SAM status codes defs
1752                 */
1753                cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1754                /*
1755                 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1756                 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1757                 * CONFLICT STATUS.
1758                 *
1759                 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1760                 */
1761                if (cmd->se_sess &&
1762                    cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
1763                        core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
1764                                cmd->orig_fe_lun, 0x2C,
1765                                ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1766
1767                ret = cmd->se_tfo->queue_status(cmd);
1768                if (ret == -EAGAIN || ret == -ENOMEM)
1769                        goto queue_full;
1770                goto check_stop;
1771        default:
1772                pr_err("Unknown transport error for CDB 0x%02x: %d\n",
1773                        cmd->t_task_cdb[0], cmd->scsi_sense_reason);
1774                cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
1775                break;
1776        }
1777
1778        ret = transport_send_check_condition_and_sense(cmd,
1779                        cmd->scsi_sense_reason, 0);
1780        if (ret == -EAGAIN || ret == -ENOMEM)
1781                goto queue_full;
1782
1783check_stop:
1784        transport_lun_remove_cmd(cmd);
1785        if (!transport_cmd_check_stop_to_fabric(cmd))
1786                ;
1787        return;
1788
1789queue_full:
1790        cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1791        transport_handle_queue_full(cmd, cmd->se_dev);
1792}
1793EXPORT_SYMBOL(transport_generic_request_failure);
1794
1795static void __target_execute_cmd(struct se_cmd *cmd)
1796{
1797        int error = 0;
1798
1799        spin_lock_irq(&cmd->t_state_lock);
1800        cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
1801        spin_unlock_irq(&cmd->t_state_lock);
1802
1803        if (cmd->execute_cmd)
1804                error = cmd->execute_cmd(cmd);
1805
1806        if (error) {
1807                spin_lock_irq(&cmd->t_state_lock);
1808                cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1809                spin_unlock_irq(&cmd->t_state_lock);
1810
1811                transport_generic_request_failure(cmd);
1812        }
1813}
1814
1815void target_execute_cmd(struct se_cmd *cmd)
1816{
1817        struct se_device *dev = cmd->se_dev;
1818
1819        /*
1820         * If the received CDB has aleady been aborted stop processing it here.
1821         */
1822        if (transport_check_aborted_status(cmd, 1)) {
1823                complete(&cmd->t_transport_stop_comp);
1824                return;
1825        }
1826
1827        /*
1828         * Determine if IOCTL context caller in requesting the stopping of this
1829         * command for LUN shutdown purposes.
1830         */
1831        spin_lock_irq(&cmd->t_state_lock);
1832        if (cmd->transport_state & CMD_T_LUN_STOP) {
1833                pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
1834                        __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
1835
1836                cmd->transport_state &= ~CMD_T_ACTIVE;
1837                spin_unlock_irq(&cmd->t_state_lock);
1838                complete(&cmd->transport_lun_stop_comp);
1839                return;
1840        }
1841        /*
1842         * Determine if frontend context caller is requesting the stopping of
1843         * this command for frontend exceptions.
1844         */
1845        if (cmd->transport_state & CMD_T_STOP) {
1846                pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1847                        __func__, __LINE__,
1848                        cmd->se_tfo->get_task_tag(cmd));
1849
1850                spin_unlock_irq(&cmd->t_state_lock);
1851                complete(&cmd->t_transport_stop_comp);
1852                return;
1853        }
1854
1855        cmd->t_state = TRANSPORT_PROCESSING;
1856        spin_unlock_irq(&cmd->t_state_lock);
1857
1858        if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1859                goto execute;
1860
1861        /*
1862         * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1863         * to allow the passed struct se_cmd list of tasks to the front of the list.
1864         */
1865        switch (cmd->sam_task_attr) {
1866        case MSG_HEAD_TAG:
1867                pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1868                         "se_ordered_id: %u\n",
1869                         cmd->t_task_cdb[0], cmd->se_ordered_id);
1870                goto execute;
1871        case MSG_ORDERED_TAG:
1872                atomic_inc(&dev->dev_ordered_sync);
1873                smp_mb__after_atomic_inc();
1874
1875                pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1876                         " se_ordered_id: %u\n",
1877                         cmd->t_task_cdb[0], cmd->se_ordered_id);
1878
1879                /*
1880                 * Execute an ORDERED command if no other older commands
1881                 * exist that need to be completed first.
1882                 */
1883                if (!atomic_read(&dev->simple_cmds))
1884                        goto execute;
1885                break;
1886        default:
1887                /*
1888                 * For SIMPLE and UNTAGGED Task Attribute commands
1889                 */
1890                atomic_inc(&dev->simple_cmds);
1891                smp_mb__after_atomic_inc();
1892                break;
1893        }
1894
1895        if (atomic_read(&dev->dev_ordered_sync) != 0) {
1896                spin_lock(&dev->delayed_cmd_lock);
1897                list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1898                spin_unlock(&dev->delayed_cmd_lock);
1899
1900                pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1901                        " delayed CMD list, se_ordered_id: %u\n",
1902                        cmd->t_task_cdb[0], cmd->sam_task_attr,
1903                        cmd->se_ordered_id);
1904                return;
1905        }
1906
1907execute:
1908        /*
1909         * Otherwise, no ORDERED task attributes exist..
1910         */
1911        __target_execute_cmd(cmd);
1912}
1913EXPORT_SYMBOL(target_execute_cmd);
1914
1915/*
1916 * Process all commands up to the last received ORDERED task attribute which
1917 * requires another blocking boundary
1918 */
1919static void target_restart_delayed_cmds(struct se_device *dev)
1920{
1921        for (;;) {
1922                struct se_cmd *cmd;
1923
1924                spin_lock(&dev->delayed_cmd_lock);
1925                if (list_empty(&dev->delayed_cmd_list)) {
1926                        spin_unlock(&dev->delayed_cmd_lock);
1927                        break;
1928                }
1929
1930                cmd = list_entry(dev->delayed_cmd_list.next,
1931                                 struct se_cmd, se_delayed_node);
1932                list_del(&cmd->se_delayed_node);
1933                spin_unlock(&dev->delayed_cmd_lock);
1934
1935                __target_execute_cmd(cmd);
1936
1937                if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1938                        break;
1939        }
1940}
1941
1942/*
1943 * Called from I/O completion to determine which dormant/delayed
1944 * and ordered cmds need to have their tasks added to the execution queue.
1945 */
1946static void transport_complete_task_attr(struct se_cmd *cmd)
1947{
1948        struct se_device *dev = cmd->se_dev;
1949
1950        if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1951                atomic_dec(&dev->simple_cmds);
1952                smp_mb__after_atomic_dec();
1953                dev->dev_cur_ordered_id++;
1954                pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1955                        " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1956                        cmd->se_ordered_id);
1957        } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1958                dev->dev_cur_ordered_id++;
1959                pr_debug("Incremented dev_cur_ordered_id: %u for"
1960                        " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1961                        cmd->se_ordered_id);
1962        } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1963                atomic_dec(&dev->dev_ordered_sync);
1964                smp_mb__after_atomic_dec();
1965
1966                dev->dev_cur_ordered_id++;
1967                pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1968                        " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1969        }
1970
1971        target_restart_delayed_cmds(dev);
1972}
1973
1974static void transport_complete_qf(struct se_cmd *cmd)
1975{
1976        int ret = 0;
1977
1978        if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1979                transport_complete_task_attr(cmd);
1980
1981        if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1982                ret = cmd->se_tfo->queue_status(cmd);
1983                if (ret)
1984                        goto out;
1985        }
1986
1987        switch (cmd->data_direction) {
1988        case DMA_FROM_DEVICE:
1989                ret = cmd->se_tfo->queue_data_in(cmd);
1990                break;
1991        case DMA_TO_DEVICE:
1992                if (cmd->t_bidi_data_sg) {
1993                        ret = cmd->se_tfo->queue_data_in(cmd);
1994                        if (ret < 0)
1995                                break;
1996                }
1997                /* Fall through for DMA_TO_DEVICE */
1998        case DMA_NONE:
1999                ret = cmd->se_tfo->queue_status(cmd);
2000                break;
2001        default:
2002                break;
2003        }
2004
2005out:
2006        if (ret < 0) {
2007                transport_handle_queue_full(cmd, cmd->se_dev);
2008                return;
2009        }
2010        transport_lun_remove_cmd(cmd);
2011        transport_cmd_check_stop_to_fabric(cmd);
2012}
2013
2014static void transport_handle_queue_full(
2015        struct se_cmd *cmd,
2016        struct se_device *dev)
2017{
2018        spin_lock_irq(&dev->qf_cmd_lock);
2019        list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2020        atomic_inc(&dev->dev_qf_count);
2021        smp_mb__after_atomic_inc();
2022        spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2023
2024        schedule_work(&cmd->se_dev->qf_work_queue);
2025}
2026
2027static void target_complete_ok_work(struct work_struct *work)
2028{
2029        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2030        int ret;
2031
2032        /*
2033         * Check if we need to move delayed/dormant tasks from cmds on the
2034         * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2035         * Attribute.
2036         */
2037        if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2038                transport_complete_task_attr(cmd);
2039        /*
2040         * Check to schedule QUEUE_FULL work, or execute an existing
2041         * cmd->transport_qf_callback()
2042         */
2043        if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2044                schedule_work(&cmd->se_dev->qf_work_queue);
2045
2046        /*
2047         * Check if we need to send a sense buffer from
2048         * the struct se_cmd in question.
2049         */
2050        if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2051                WARN_ON(!cmd->scsi_status);
2052                ret = transport_send_check_condition_and_sense(
2053                                        cmd, 0, 1);
2054                if (ret == -EAGAIN || ret == -ENOMEM)
2055                        goto queue_full;
2056
2057                transport_lun_remove_cmd(cmd);
2058                transport_cmd_check_stop_to_fabric(cmd);
2059                return;
2060        }
2061        /*
2062         * Check for a callback, used by amongst other things
2063         * XDWRITE_READ_10 emulation.
2064         */
2065        if (cmd->transport_complete_callback)
2066                cmd->transport_complete_callback(cmd);
2067
2068        switch (cmd->data_direction) {
2069        case DMA_FROM_DEVICE:
2070                spin_lock(&cmd->se_lun->lun_sep_lock);
2071                if (cmd->se_lun->lun_sep) {
2072                        cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2073                                        cmd->data_length;
2074                }
2075                spin_unlock(&cmd->se_lun->lun_sep_lock);
2076
2077                ret = cmd->se_tfo->queue_data_in(cmd);
2078                if (ret == -EAGAIN || ret == -ENOMEM)
2079                        goto queue_full;
2080                break;
2081        case DMA_TO_DEVICE:
2082                spin_lock(&cmd->se_lun->lun_sep_lock);
2083                if (cmd->se_lun->lun_sep) {
2084                        cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2085                                cmd->data_length;
2086                }
2087                spin_unlock(&cmd->se_lun->lun_sep_lock);
2088                /*
2089                 * Check if we need to send READ payload for BIDI-COMMAND
2090                 */
2091                if (cmd->t_bidi_data_sg) {
2092                        spin_lock(&cmd->se_lun->lun_sep_lock);
2093                        if (cmd->se_lun->lun_sep) {
2094                                cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2095                                        cmd->data_length;
2096                        }
2097                        spin_unlock(&cmd->se_lun->lun_sep_lock);
2098                        ret = cmd->se_tfo->queue_data_in(cmd);
2099                        if (ret == -EAGAIN || ret == -ENOMEM)
2100                                goto queue_full;
2101                        break;
2102                }
2103                /* Fall through for DMA_TO_DEVICE */
2104        case DMA_NONE:
2105                ret = cmd->se_tfo->queue_status(cmd);
2106                if (ret == -EAGAIN || ret == -ENOMEM)
2107                        goto queue_full;
2108                break;
2109        default:
2110                break;
2111        }
2112
2113        transport_lun_remove_cmd(cmd);
2114        transport_cmd_check_stop_to_fabric(cmd);
2115        return;
2116
2117queue_full:
2118        pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2119                " data_direction: %d\n", cmd, cmd->data_direction);
2120        cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2121        transport_handle_queue_full(cmd, cmd->se_dev);
2122}
2123
2124static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2125{
2126        struct scatterlist *sg;
2127        int count;
2128
2129        for_each_sg(sgl, sg, nents, count)
2130                __free_page(sg_page(sg));
2131
2132        kfree(sgl);
2133}
2134
2135static inline void transport_free_pages(struct se_cmd *cmd)
2136{
2137        if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2138                return;
2139
2140        transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2141        cmd->t_data_sg = NULL;
2142        cmd->t_data_nents = 0;
2143
2144        transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2145        cmd->t_bidi_data_sg = NULL;
2146        cmd->t_bidi_data_nents = 0;
2147}
2148
2149/**
2150 * transport_release_cmd - free a command
2151 * @cmd:       command to free
2152 *
2153 * This routine unconditionally frees a command, and reference counting
2154 * or list removal must be done in the caller.
2155 */
2156static void transport_release_cmd(struct se_cmd *cmd)
2157{
2158        BUG_ON(!cmd->se_tfo);
2159
2160        if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2161                core_tmr_release_req(cmd->se_tmr_req);
2162        if (cmd->t_task_cdb != cmd->__t_task_cdb)
2163                kfree(cmd->t_task_cdb);
2164        /*
2165         * If this cmd has been setup with target_get_sess_cmd(), drop
2166         * the kref and call ->release_cmd() in kref callback.
2167         */
2168         if (cmd->check_release != 0) {
2169                target_put_sess_cmd(cmd->se_sess, cmd);
2170                return;
2171        }
2172        cmd->se_tfo->release_cmd(cmd);
2173}
2174
2175/**
2176 * transport_put_cmd - release a reference to a command
2177 * @cmd:       command to release
2178 *
2179 * This routine releases our reference to the command and frees it if possible.
2180 */
2181static void transport_put_cmd(struct se_cmd *cmd)
2182{
2183        unsigned long flags;
2184
2185        spin_lock_irqsave(&cmd->t_state_lock, flags);
2186        if (atomic_read(&cmd->t_fe_count)) {
2187                if (!atomic_dec_and_test(&cmd->t_fe_count))
2188                        goto out_busy;
2189        }
2190
2191        if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2192                cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2193                target_remove_from_state_list(cmd);
2194        }
2195        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2196
2197        transport_free_pages(cmd);
2198        transport_release_cmd(cmd);
2199        return;
2200out_busy:
2201        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2202}
2203
2204/*
2205 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2206 * allocating in the core.
2207 * @cmd:  Associated se_cmd descriptor
2208 * @mem:  SGL style memory for TCM WRITE / READ
2209 * @sg_mem_num: Number of SGL elements
2210 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2211 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2212 *
2213 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2214 * of parameters.
2215 */
2216int transport_generic_map_mem_to_cmd(
2217        struct se_cmd *cmd,
2218        struct scatterlist *sgl,
2219        u32 sgl_count,
2220        struct scatterlist *sgl_bidi,
2221        u32 sgl_bidi_count)
2222{
2223        if (!sgl || !sgl_count)
2224                return 0;
2225
2226        /*
2227         * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2228         * scatterlists already have been set to follow what the fabric
2229         * passes for the original expected data transfer length.
2230         */
2231        if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2232                pr_warn("Rejecting SCSI DATA overflow for fabric using"
2233                        " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2234                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2235                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2236                return -EINVAL;
2237        }
2238
2239        cmd->t_data_sg = sgl;
2240        cmd->t_data_nents = sgl_count;
2241
2242        if (sgl_bidi && sgl_bidi_count) {
2243                cmd->t_bidi_data_sg = sgl_bidi;
2244                cmd->t_bidi_data_nents = sgl_bidi_count;
2245        }
2246        cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2247        return 0;
2248}
2249EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2250
2251void *transport_kmap_data_sg(struct se_cmd *cmd)
2252{
2253        struct scatterlist *sg = cmd->t_data_sg;
2254        struct page **pages;
2255        int i;
2256
2257        /*
2258         * We need to take into account a possible offset here for fabrics like
2259         * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2260         * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2261         */
2262        if (!cmd->t_data_nents)
2263                return NULL;
2264
2265        BUG_ON(!sg);
2266        if (cmd->t_data_nents == 1)
2267                return kmap(sg_page(sg)) + sg->offset;
2268
2269        /* >1 page. use vmap */
2270        pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2271        if (!pages) {
2272                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2273                return NULL;
2274        }
2275
2276        /* convert sg[] to pages[] */
2277        for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2278                pages[i] = sg_page(sg);
2279        }
2280
2281        cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2282        kfree(pages);
2283        if (!cmd->t_data_vmap) {
2284                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2285                return NULL;
2286        }
2287
2288        return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2289}
2290EXPORT_SYMBOL(transport_kmap_data_sg);
2291
2292void transport_kunmap_data_sg(struct se_cmd *cmd)
2293{
2294        if (!cmd->t_data_nents) {
2295                return;
2296        } else if (cmd->t_data_nents == 1) {
2297                kunmap(sg_page(cmd->t_data_sg));
2298                return;
2299        }
2300
2301        vunmap(cmd->t_data_vmap);
2302        cmd->t_data_vmap = NULL;
2303}
2304EXPORT_SYMBOL(transport_kunmap_data_sg);
2305
2306static int
2307transport_generic_get_mem(struct se_cmd *cmd)
2308{
2309        u32 length = cmd->data_length;
2310        unsigned int nents;
2311        struct page *page;
2312        gfp_t zero_flag;
2313        int i = 0;
2314
2315        nents = DIV_ROUND_UP(length, PAGE_SIZE);
2316        cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2317        if (!cmd->t_data_sg)
2318                return -ENOMEM;
2319
2320        cmd->t_data_nents = nents;
2321        sg_init_table(cmd->t_data_sg, nents);
2322
2323        zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2324
2325        while (length) {
2326                u32 page_len = min_t(u32, length, PAGE_SIZE);
2327                page = alloc_page(GFP_KERNEL | zero_flag);
2328                if (!page)
2329                        goto out;
2330
2331                sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2332                length -= page_len;
2333                i++;
2334        }
2335        return 0;
2336
2337out:
2338        while (i > 0) {
2339                i--;
2340                __free_page(sg_page(&cmd->t_data_sg[i]));
2341        }
2342        kfree(cmd->t_data_sg);
2343        cmd->t_data_sg = NULL;
2344        return -ENOMEM;
2345}
2346
2347/*
2348 * Allocate any required resources to execute the command.  For writes we
2349 * might not have the payload yet, so notify the fabric via a call to
2350 * ->write_pending instead. Otherwise place it on the execution queue.
2351 */
2352int transport_generic_new_cmd(struct se_cmd *cmd)
2353{
2354        int ret = 0;
2355
2356        /*
2357         * Determine is the TCM fabric module has already allocated physical
2358         * memory, and is directly calling transport_generic_map_mem_to_cmd()
2359         * beforehand.
2360         */
2361        if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2362            cmd->data_length) {
2363                ret = transport_generic_get_mem(cmd);
2364                if (ret < 0)
2365                        goto out_fail;
2366        }
2367
2368        atomic_inc(&cmd->t_fe_count);
2369
2370        /*
2371         * If this command is not a write we can execute it right here,
2372         * for write buffers we need to notify the fabric driver first
2373         * and let it call back once the write buffers are ready.
2374         */
2375        target_add_to_state_list(cmd);
2376        if (cmd->data_direction != DMA_TO_DEVICE) {
2377                target_execute_cmd(cmd);
2378                return 0;
2379        }
2380
2381        spin_lock_irq(&cmd->t_state_lock);
2382        cmd->t_state = TRANSPORT_WRITE_PENDING;
2383        spin_unlock_irq(&cmd->t_state_lock);
2384
2385        transport_cmd_check_stop(cmd, false);
2386
2387        ret = cmd->se_tfo->write_pending(cmd);
2388        if (ret == -EAGAIN || ret == -ENOMEM)
2389                goto queue_full;
2390
2391        if (ret < 0)
2392                return ret;
2393        return 1;
2394
2395out_fail:
2396        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2397        cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2398        return -EINVAL;
2399queue_full:
2400        pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2401        cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2402        transport_handle_queue_full(cmd, cmd->se_dev);
2403        return 0;
2404}
2405EXPORT_SYMBOL(transport_generic_new_cmd);
2406
2407static void transport_write_pending_qf(struct se_cmd *cmd)
2408{
2409        int ret;
2410
2411        ret = cmd->se_tfo->write_pending(cmd);
2412        if (ret == -EAGAIN || ret == -ENOMEM) {
2413                pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2414                         cmd);
2415                transport_handle_queue_full(cmd, cmd->se_dev);
2416        }
2417}
2418
2419void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2420{
2421        if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2422                if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2423                         transport_wait_for_tasks(cmd);
2424
2425                transport_release_cmd(cmd);
2426        } else {
2427                if (wait_for_tasks)
2428                        transport_wait_for_tasks(cmd);
2429
2430                core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2431
2432                if (cmd->se_lun)
2433                        transport_lun_remove_cmd(cmd);
2434
2435                transport_put_cmd(cmd);
2436        }
2437}
2438EXPORT_SYMBOL(transport_generic_free_cmd);
2439
2440/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2441 * @se_sess:    session to reference
2442 * @se_cmd:     command descriptor to add
2443 * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2444 */
2445static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2446                               bool ack_kref)
2447{
2448        unsigned long flags;
2449        int ret = 0;
2450
2451        kref_init(&se_cmd->cmd_kref);
2452        /*
2453         * Add a second kref if the fabric caller is expecting to handle
2454         * fabric acknowledgement that requires two target_put_sess_cmd()
2455         * invocations before se_cmd descriptor release.
2456         */
2457        if (ack_kref == true) {
2458                kref_get(&se_cmd->cmd_kref);
2459                se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2460        }
2461
2462        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2463        if (se_sess->sess_tearing_down) {
2464                ret = -ESHUTDOWN;
2465                goto out;
2466        }
2467        list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2468        se_cmd->check_release = 1;
2469
2470out:
2471        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2472        return ret;
2473}
2474
2475static void target_release_cmd_kref(struct kref *kref)
2476{
2477        struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2478        struct se_session *se_sess = se_cmd->se_sess;
2479        unsigned long flags;
2480
2481        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2482        if (list_empty(&se_cmd->se_cmd_list)) {
2483                spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2484                se_cmd->se_tfo->release_cmd(se_cmd);
2485                return;
2486        }
2487        if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2488                spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2489                complete(&se_cmd->cmd_wait_comp);
2490                return;
2491        }
2492        list_del(&se_cmd->se_cmd_list);
2493        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2494
2495        se_cmd->se_tfo->release_cmd(se_cmd);
2496}
2497
2498/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2499 * @se_sess:    session to reference
2500 * @se_cmd:     command descriptor to drop
2501 */
2502int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2503{
2504        return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2505}
2506EXPORT_SYMBOL(target_put_sess_cmd);
2507
2508/* target_sess_cmd_list_set_waiting - Flag all commands in
2509 *         sess_cmd_list to complete cmd_wait_comp.  Set
2510 *         sess_tearing_down so no more commands are queued.
2511 * @se_sess:    session to flag
2512 */
2513void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2514{
2515        struct se_cmd *se_cmd;
2516        unsigned long flags;
2517
2518        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2519
2520        WARN_ON(se_sess->sess_tearing_down);
2521        se_sess->sess_tearing_down = 1;
2522
2523        list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2524                se_cmd->cmd_wait_set = 1;
2525
2526        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2527}
2528EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2529
2530/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2531 * @se_sess:    session to wait for active I/O
2532 * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2533 */
2534void target_wait_for_sess_cmds(
2535        struct se_session *se_sess,
2536        int wait_for_tasks)
2537{
2538        struct se_cmd *se_cmd, *tmp_cmd;
2539        bool rc = false;
2540
2541        list_for_each_entry_safe(se_cmd, tmp_cmd,
2542                                &se_sess->sess_cmd_list, se_cmd_list) {
2543                list_del(&se_cmd->se_cmd_list);
2544
2545                pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2546                        " %d\n", se_cmd, se_cmd->t_state,
2547                        se_cmd->se_tfo->get_cmd_state(se_cmd));
2548
2549                if (wait_for_tasks) {
2550                        pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2551                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2552                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2553
2554                        rc = transport_wait_for_tasks(se_cmd);
2555
2556                        pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2557                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2558                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2559                }
2560
2561                if (!rc) {
2562                        wait_for_completion(&se_cmd->cmd_wait_comp);
2563                        pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2564                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2565                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2566                }
2567
2568                se_cmd->se_tfo->release_cmd(se_cmd);
2569        }
2570}
2571EXPORT_SYMBOL(target_wait_for_sess_cmds);
2572
2573/*      transport_lun_wait_for_tasks():
2574 *
2575 *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2576 *      an struct se_lun to be successfully shutdown.
2577 */
2578static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2579{
2580        unsigned long flags;
2581        int ret = 0;
2582
2583        /*
2584         * If the frontend has already requested this struct se_cmd to
2585         * be stopped, we can safely ignore this struct se_cmd.
2586         */
2587        spin_lock_irqsave(&cmd->t_state_lock, flags);
2588        if (cmd->transport_state & CMD_T_STOP) {
2589                cmd->transport_state &= ~CMD_T_LUN_STOP;
2590
2591                pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2592                         cmd->se_tfo->get_task_tag(cmd));
2593                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2594                transport_cmd_check_stop(cmd, false);
2595                return -EPERM;
2596        }
2597        cmd->transport_state |= CMD_T_LUN_FE_STOP;
2598        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2599
2600        // XXX: audit task_flags checks.
2601        spin_lock_irqsave(&cmd->t_state_lock, flags);
2602        if ((cmd->transport_state & CMD_T_BUSY) &&
2603            (cmd->transport_state & CMD_T_SENT)) {
2604                if (!target_stop_cmd(cmd, &flags))
2605                        ret++;
2606        }
2607        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2608
2609        pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2610                        " %d\n", cmd, ret);
2611        if (!ret) {
2612                pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2613                                cmd->se_tfo->get_task_tag(cmd));
2614                wait_for_completion(&cmd->transport_lun_stop_comp);
2615                pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2616                                cmd->se_tfo->get_task_tag(cmd));
2617        }
2618
2619        return 0;
2620}
2621
2622static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2623{
2624        struct se_cmd *cmd = NULL;
2625        unsigned long lun_flags, cmd_flags;
2626        /*
2627         * Do exception processing and return CHECK_CONDITION status to the
2628         * Initiator Port.
2629         */
2630        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2631        while (!list_empty(&lun->lun_cmd_list)) {
2632                cmd = list_first_entry(&lun->lun_cmd_list,
2633                       struct se_cmd, se_lun_node);
2634                list_del_init(&cmd->se_lun_node);
2635
2636                spin_lock(&cmd->t_state_lock);
2637                pr_debug("SE_LUN[%d] - Setting cmd->transport"
2638                        "_lun_stop for  ITT: 0x%08x\n",
2639                        cmd->se_lun->unpacked_lun,
2640                        cmd->se_tfo->get_task_tag(cmd));
2641                cmd->transport_state |= CMD_T_LUN_STOP;
2642                spin_unlock(&cmd->t_state_lock);
2643
2644                spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2645
2646                if (!cmd->se_lun) {
2647                        pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2648                                cmd->se_tfo->get_task_tag(cmd),
2649                                cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2650                        BUG();
2651                }
2652                /*
2653                 * If the Storage engine still owns the iscsi_cmd_t, determine
2654                 * and/or stop its context.
2655                 */
2656                pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2657                        "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2658                        cmd->se_tfo->get_task_tag(cmd));
2659
2660                if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2661                        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2662                        continue;
2663                }
2664
2665                pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2666                        "_wait_for_tasks(): SUCCESS\n",
2667                        cmd->se_lun->unpacked_lun,
2668                        cmd->se_tfo->get_task_tag(cmd));
2669
2670                spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2671                if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2672                        spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2673                        goto check_cond;
2674                }
2675                cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2676                target_remove_from_state_list(cmd);
2677                spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2678
2679                /*
2680                 * The Storage engine stopped this struct se_cmd before it was
2681                 * send to the fabric frontend for delivery back to the
2682                 * Initiator Node.  Return this SCSI CDB back with an
2683                 * CHECK_CONDITION status.
2684                 */
2685check_cond:
2686                transport_send_check_condition_and_sense(cmd,
2687                                TCM_NON_EXISTENT_LUN, 0);
2688                /*
2689                 *  If the fabric frontend is waiting for this iscsi_cmd_t to
2690                 * be released, notify the waiting thread now that LU has
2691                 * finished accessing it.
2692                 */
2693                spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2694                if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2695                        pr_debug("SE_LUN[%d] - Detected FE stop for"
2696                                " struct se_cmd: %p ITT: 0x%08x\n",
2697                                lun->unpacked_lun,
2698                                cmd, cmd->se_tfo->get_task_tag(cmd));
2699
2700                        spin_unlock_irqrestore(&cmd->t_state_lock,
2701                                        cmd_flags);
2702                        transport_cmd_check_stop(cmd, false);
2703                        complete(&cmd->transport_lun_fe_stop_comp);
2704                        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2705                        continue;
2706                }
2707                pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2708                        lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2709
2710                spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2711                spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2712        }
2713        spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2714}
2715
2716static int transport_clear_lun_thread(void *p)
2717{
2718        struct se_lun *lun = p;
2719
2720        __transport_clear_lun_from_sessions(lun);
2721        complete(&lun->lun_shutdown_comp);
2722
2723        return 0;
2724}
2725
2726int transport_clear_lun_from_sessions(struct se_lun *lun)
2727{
2728        struct task_struct *kt;
2729
2730        kt = kthread_run(transport_clear_lun_thread, lun,
2731                        "tcm_cl_%u", lun->unpacked_lun);
2732        if (IS_ERR(kt)) {
2733                pr_err("Unable to start clear_lun thread\n");
2734                return PTR_ERR(kt);
2735        }
2736        wait_for_completion(&lun->lun_shutdown_comp);
2737
2738        return 0;
2739}
2740
2741/**
2742 * transport_wait_for_tasks - wait for completion to occur
2743 * @cmd:        command to wait
2744 *
2745 * Called from frontend fabric context to wait for storage engine
2746 * to pause and/or release frontend generated struct se_cmd.
2747 */
2748bool transport_wait_for_tasks(struct se_cmd *cmd)
2749{
2750        unsigned long flags;
2751
2752        spin_lock_irqsave(&cmd->t_state_lock, flags);
2753        if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2754            !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2755                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2756                return false;
2757        }
2758
2759        if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2760            !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2761                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2762                return false;
2763        }
2764        /*
2765         * If we are already stopped due to an external event (ie: LUN shutdown)
2766         * sleep until the connection can have the passed struct se_cmd back.
2767         * The cmd->transport_lun_stopped_sem will be upped by
2768         * transport_clear_lun_from_sessions() once the ConfigFS context caller
2769         * has completed its operation on the struct se_cmd.
2770         */
2771        if (cmd->transport_state & CMD_T_LUN_STOP) {
2772                pr_debug("wait_for_tasks: Stopping"
2773                        " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2774                        "_stop_comp); for ITT: 0x%08x\n",
2775                        cmd->se_tfo->get_task_tag(cmd));
2776                /*
2777                 * There is a special case for WRITES where a FE exception +
2778                 * LUN shutdown means ConfigFS context is still sleeping on
2779                 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2780                 * We go ahead and up transport_lun_stop_comp just to be sure
2781                 * here.
2782                 */
2783                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2784                complete(&cmd->transport_lun_stop_comp);
2785                wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2786                spin_lock_irqsave(&cmd->t_state_lock, flags);
2787
2788                target_remove_from_state_list(cmd);
2789                /*
2790                 * At this point, the frontend who was the originator of this
2791                 * struct se_cmd, now owns the structure and can be released through
2792                 * normal means below.
2793                 */
2794                pr_debug("wait_for_tasks: Stopped"
2795                        " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2796                        "stop_comp); for ITT: 0x%08x\n",
2797                        cmd->se_tfo->get_task_tag(cmd));
2798
2799                cmd->transport_state &= ~CMD_T_LUN_STOP;
2800        }
2801
2802        if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2803                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2804                return false;
2805        }
2806
2807        cmd->transport_state |= CMD_T_STOP;
2808
2809        pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2810                " i_state: %d, t_state: %d, CMD_T_STOP\n",
2811                cmd, cmd->se_tfo->get_task_tag(cmd),
2812                cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2813
2814        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2815
2816        wait_for_completion(&cmd->t_transport_stop_comp);
2817
2818        spin_lock_irqsave(&cmd->t_state_lock, flags);
2819        cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2820
2821        pr_debug("wait_for_tasks: Stopped wait_for_completion("
2822                "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2823                cmd->se_tfo->get_task_tag(cmd));
2824
2825        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2826
2827        return true;
2828}
2829EXPORT_SYMBOL(transport_wait_for_tasks);
2830
2831static int transport_get_sense_codes(
2832        struct se_cmd *cmd,
2833        u8 *asc,
2834        u8 *ascq)
2835{
2836        *asc = cmd->scsi_asc;
2837        *ascq = cmd->scsi_ascq;
2838
2839        return 0;
2840}
2841
2842static int transport_set_sense_codes(
2843        struct se_cmd *cmd,
2844        u8 asc,
2845        u8 ascq)
2846{
2847        cmd->scsi_asc = asc;
2848        cmd->scsi_ascq = ascq;
2849
2850        return 0;
2851}
2852
2853int transport_send_check_condition_and_sense(
2854        struct se_cmd *cmd,
2855        u8 reason,
2856        int from_transport)
2857{
2858        unsigned char *buffer = cmd->sense_buffer;
2859        unsigned long flags;
2860        u8 asc = 0, ascq = 0;
2861
2862        spin_lock_irqsave(&cmd->t_state_lock, flags);
2863        if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2864                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2865                return 0;
2866        }
2867        cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2868        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2869
2870        if (!reason && from_transport)
2871                goto after_reason;
2872
2873        if (!from_transport)
2874                cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2875
2876        /*
2877         * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2878         * SENSE KEY values from include/scsi/scsi.h
2879         */
2880        switch (reason) {
2881        case TCM_NON_EXISTENT_LUN:
2882                /* CURRENT ERROR */
2883                buffer[0] = 0x70;
2884                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2885                /* ILLEGAL REQUEST */
2886                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2887                /* LOGICAL UNIT NOT SUPPORTED */
2888                buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2889                break;
2890        case TCM_UNSUPPORTED_SCSI_OPCODE:
2891        case TCM_SECTOR_COUNT_TOO_MANY:
2892                /* CURRENT ERROR */
2893                buffer[0] = 0x70;
2894                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2895                /* ILLEGAL REQUEST */
2896                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2897                /* INVALID COMMAND OPERATION CODE */
2898                buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2899                break;
2900        case TCM_UNKNOWN_MODE_PAGE:
2901                /* CURRENT ERROR */
2902                buffer[0] = 0x70;
2903                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2904                /* ILLEGAL REQUEST */
2905                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2906                /* INVALID FIELD IN CDB */
2907                buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2908                break;
2909        case TCM_CHECK_CONDITION_ABORT_CMD:
2910                /* CURRENT ERROR */
2911                buffer[0] = 0x70;
2912                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2913                /* ABORTED COMMAND */
2914                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2915                /* BUS DEVICE RESET FUNCTION OCCURRED */
2916                buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2917                buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2918                break;
2919        case TCM_INCORRECT_AMOUNT_OF_DATA:
2920                /* CURRENT ERROR */
2921                buffer[0] = 0x70;
2922                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2923                /* ABORTED COMMAND */
2924                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2925                /* WRITE ERROR */
2926                buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2927                /* NOT ENOUGH UNSOLICITED DATA */
2928                buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2929                break;
2930        case TCM_INVALID_CDB_FIELD:
2931                /* CURRENT ERROR */
2932                buffer[0] = 0x70;
2933                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2934                /* ILLEGAL REQUEST */
2935                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2936                /* INVALID FIELD IN CDB */
2937                buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2938                break;
2939        case TCM_INVALID_PARAMETER_LIST:
2940                /* CURRENT ERROR */
2941                buffer[0] = 0x70;
2942                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2943                /* ILLEGAL REQUEST */
2944                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2945                /* INVALID FIELD IN PARAMETER LIST */
2946                buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2947                break;
2948        case TCM_UNEXPECTED_UNSOLICITED_DATA:
2949                /* CURRENT ERROR */
2950                buffer[0] = 0x70;
2951                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2952                /* ABORTED COMMAND */
2953                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2954                /* WRITE ERROR */
2955                buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2956                /* UNEXPECTED_UNSOLICITED_DATA */
2957                buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2958                break;
2959        case TCM_SERVICE_CRC_ERROR:
2960                /* CURRENT ERROR */
2961                buffer[0] = 0x70;
2962                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2963                /* ABORTED COMMAND */
2964                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2965                /* PROTOCOL SERVICE CRC ERROR */
2966                buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2967                /* N/A */
2968                buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2969                break;
2970        case TCM_SNACK_REJECTED:
2971                /* CURRENT ERROR */
2972                buffer[0] = 0x70;
2973                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2974                /* ABORTED COMMAND */
2975                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2976                /* READ ERROR */
2977                buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2978                /* FAILED RETRANSMISSION REQUEST */
2979                buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2980                break;
2981        case TCM_WRITE_PROTECTED:
2982                /* CURRENT ERROR */
2983                buffer[0] = 0x70;
2984                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2985                /* DATA PROTECT */
2986                buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2987                /* WRITE PROTECTED */
2988                buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2989                break;
2990        case TCM_ADDRESS_OUT_OF_RANGE:
2991                /* CURRENT ERROR */
2992                buffer[0] = 0x70;
2993                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2994                /* ILLEGAL REQUEST */
2995                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2996                /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2997                buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2998                break;
2999        case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3000                /* CURRENT ERROR */
3001                buffer[0] = 0x70;
3002                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3003                /* UNIT ATTENTION */
3004                buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3005                core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3006                buffer[SPC_ASC_KEY_OFFSET] = asc;
3007                buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3008                break;
3009        case TCM_CHECK_CONDITION_NOT_READY:
3010                /* CURRENT ERROR */
3011                buffer[0] = 0x70;
3012                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3013                /* Not Ready */
3014                buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
3015                transport_get_sense_codes(cmd, &asc, &ascq);
3016                buffer[SPC_ASC_KEY_OFFSET] = asc;
3017                buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3018                break;
3019        case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3020        default:
3021                /* CURRENT ERROR */
3022                buffer[0] = 0x70;
3023                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3024                /* ILLEGAL REQUEST */
3025                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3026                /* LOGICAL UNIT COMMUNICATION FAILURE */
3027                buffer[SPC_ASC_KEY_OFFSET] = 0x80;
3028                break;
3029        }
3030        /*
3031         * This code uses linux/include/scsi/scsi.h SAM status codes!
3032         */
3033        cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3034        /*
3035         * Automatically padded, this value is encoded in the fabric's
3036         * data_length response PDU containing the SCSI defined sense data.
3037         */
3038        cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER;
3039
3040after_reason:
3041        return cmd->se_tfo->queue_status(cmd);
3042}
3043EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3044
3045int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3046{
3047        int ret = 0;
3048
3049        if (cmd->transport_state & CMD_T_ABORTED) {
3050                if (!send_status ||
3051                     (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3052                        return 1;
3053
3054                pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3055                        " status for CDB: 0x%02x ITT: 0x%08x\n",
3056                        cmd->t_task_cdb[0],
3057                        cmd->se_tfo->get_task_tag(cmd));
3058
3059                cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3060                cmd->se_tfo->queue_status(cmd);
3061                ret = 1;
3062        }
3063        return ret;
3064}
3065EXPORT_SYMBOL(transport_check_aborted_status);
3066
3067void transport_send_task_abort(struct se_cmd *cmd)
3068{
3069        unsigned long flags;
3070
3071        spin_lock_irqsave(&cmd->t_state_lock, flags);
3072        if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
3073                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3074                return;
3075        }
3076        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3077
3078        /*
3079         * If there are still expected incoming fabric WRITEs, we wait
3080         * until until they have completed before sending a TASK_ABORTED
3081         * response.  This response with TASK_ABORTED status will be
3082         * queued back to fabric module by transport_check_aborted_status().
3083         */
3084        if (cmd->data_direction == DMA_TO_DEVICE) {
3085                if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3086                        cmd->transport_state |= CMD_T_ABORTED;
3087                        smp_mb__after_atomic_inc();
3088                }
3089        }
3090        cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3091
3092        pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3093                " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3094                cmd->se_tfo->get_task_tag(cmd));
3095
3096        cmd->se_tfo->queue_status(cmd);
3097}
3098
3099static void target_tmr_work(struct work_struct *work)
3100{
3101        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3102        struct se_device *dev = cmd->se_dev;
3103        struct se_tmr_req *tmr = cmd->se_tmr_req;
3104        int ret;
3105
3106        switch (tmr->function) {
3107        case TMR_ABORT_TASK:
3108                core_tmr_abort_task(dev, tmr, cmd->se_sess);
3109                break;
3110        case TMR_ABORT_TASK_SET:
3111        case TMR_CLEAR_ACA:
3112        case TMR_CLEAR_TASK_SET:
3113                tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3114                break;
3115        case TMR_LUN_RESET:
3116                ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3117                tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3118                                         TMR_FUNCTION_REJECTED;
3119                break;
3120        case TMR_TARGET_WARM_RESET:
3121                tmr->response = TMR_FUNCTION_REJECTED;
3122                break;
3123        case TMR_TARGET_COLD_RESET:
3124                tmr->response = TMR_FUNCTION_REJECTED;
3125                break;
3126        default:
3127                pr_err("Uknown TMR function: 0x%02x.\n",
3128                                tmr->function);
3129                tmr->response = TMR_FUNCTION_REJECTED;
3130                break;
3131        }
3132
3133        cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3134        cmd->se_tfo->queue_tm_rsp(cmd);
3135
3136        transport_cmd_check_stop_to_fabric(cmd);
3137}
3138
3139int transport_generic_handle_tmr(
3140        struct se_cmd *cmd)
3141{
3142        INIT_WORK(&cmd->work, target_tmr_work);
3143        queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3144        return 0;
3145}
3146EXPORT_SYMBOL(transport_generic_handle_tmr);
3147
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