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 (transport_cmd_check_stop_to_fabric(cmd))
 549                return;
 550        if (remove)
 551                transport_put_cmd(cmd);
 552}
 553
 554static void target_complete_failure_work(struct work_struct *work)
 555{
 556        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
 557
 558        transport_generic_request_failure(cmd);
 559}
 560
 561/*
 562 * Used when asking transport to copy Sense Data from the underlying
 563 * Linux/SCSI struct scsi_cmnd
 564 */
 565static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
 566{
 567        struct se_device *dev = cmd->se_dev;
 568
 569        WARN_ON(!cmd->se_lun);
 570
 571        if (!dev)
 572                return NULL;
 573
 574        if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
 575                return NULL;
 576
 577        cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
 578
 579        pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
 580                dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
 581        return cmd->sense_buffer;
 582}
 583
 584void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
 585{
 586        struct se_device *dev = cmd->se_dev;
 587        int success = scsi_status == GOOD;
 588        unsigned long flags;
 589
 590        cmd->scsi_status = scsi_status;
 591
 592
 593        spin_lock_irqsave(&cmd->t_state_lock, flags);
 594        cmd->transport_state &= ~CMD_T_BUSY;
 595
 596        if (dev && dev->transport->transport_complete) {
 597                dev->transport->transport_complete(cmd,
 598                                cmd->t_data_sg,
 599                                transport_get_sense_buffer(cmd));
 600                if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
 601                        success = 1;
 602        }
 603
 604        /*
 605         * See if we are waiting to complete for an exception condition.
 606         */
 607        if (cmd->transport_state & CMD_T_REQUEST_STOP) {
 608                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 609                complete(&cmd->task_stop_comp);
 610                return;
 611        }
 612
 613        if (!success)
 614                cmd->transport_state |= CMD_T_FAILED;
 615
 616        /*
 617         * Check for case where an explict ABORT_TASK has been received
 618         * and transport_wait_for_tasks() will be waiting for completion..
 619         */
 620        if (cmd->transport_state & CMD_T_ABORTED &&
 621            cmd->transport_state & CMD_T_STOP) {
 622                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 623                complete(&cmd->t_transport_stop_comp);
 624                return;
 625        } else if (cmd->transport_state & CMD_T_FAILED) {
 626                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 627                INIT_WORK(&cmd->work, target_complete_failure_work);
 628        } else {
 629                INIT_WORK(&cmd->work, target_complete_ok_work);
 630        }
 631
 632        cmd->t_state = TRANSPORT_COMPLETE;
 633        cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
 634        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 635
 636        queue_work(target_completion_wq, &cmd->work);
 637}
 638EXPORT_SYMBOL(target_complete_cmd);
 639
 640static void target_add_to_state_list(struct se_cmd *cmd)
 641{
 642        struct se_device *dev = cmd->se_dev;
 643        unsigned long flags;
 644
 645        spin_lock_irqsave(&dev->execute_task_lock, flags);
 646        if (!cmd->state_active) {
 647                list_add_tail(&cmd->state_list, &dev->state_list);
 648                cmd->state_active = true;
 649        }
 650        spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 651}
 652
 653/*
 654 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
 655 */
 656static void transport_write_pending_qf(struct se_cmd *cmd);
 657static void transport_complete_qf(struct se_cmd *cmd);
 658
 659static void target_qf_do_work(struct work_struct *work)
 660{
 661        struct se_device *dev = container_of(work, struct se_device,
 662                                        qf_work_queue);
 663        LIST_HEAD(qf_cmd_list);
 664        struct se_cmd *cmd, *cmd_tmp;
 665
 666        spin_lock_irq(&dev->qf_cmd_lock);
 667        list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
 668        spin_unlock_irq(&dev->qf_cmd_lock);
 669
 670        list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
 671                list_del(&cmd->se_qf_node);
 672                atomic_dec(&dev->dev_qf_count);
 673                smp_mb__after_atomic_dec();
 674
 675                pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
 676                        " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
 677                        (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
 678                        (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
 679                        : "UNKNOWN");
 680
 681                if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
 682                        transport_write_pending_qf(cmd);
 683                else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
 684                        transport_complete_qf(cmd);
 685        }
 686}
 687
 688unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
 689{
 690        switch (cmd->data_direction) {
 691        case DMA_NONE:
 692                return "NONE";
 693        case DMA_FROM_DEVICE:
 694                return "READ";
 695        case DMA_TO_DEVICE:
 696                return "WRITE";
 697        case DMA_BIDIRECTIONAL:
 698                return "BIDI";
 699        default:
 700                break;
 701        }
 702
 703        return "UNKNOWN";
 704}
 705
 706void transport_dump_dev_state(
 707        struct se_device *dev,
 708        char *b,
 709        int *bl)
 710{
 711        *bl += sprintf(b + *bl, "Status: ");
 712        switch (dev->dev_status) {
 713        case TRANSPORT_DEVICE_ACTIVATED:
 714                *bl += sprintf(b + *bl, "ACTIVATED");
 715                break;
 716        case TRANSPORT_DEVICE_DEACTIVATED:
 717                *bl += sprintf(b + *bl, "DEACTIVATED");
 718                break;
 719        case TRANSPORT_DEVICE_SHUTDOWN:
 720                *bl += sprintf(b + *bl, "SHUTDOWN");
 721                break;
 722        case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
 723        case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
 724                *bl += sprintf(b + *bl, "OFFLINE");
 725                break;
 726        default:
 727                *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
 728                break;
 729        }
 730
 731        *bl += sprintf(b + *bl, "  Max Queue Depth: %d", dev->queue_depth);
 732        *bl += sprintf(b + *bl, "  SectorSize: %u  HwMaxSectors: %u\n",
 733                dev->se_sub_dev->se_dev_attrib.block_size,
 734                dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
 735        *bl += sprintf(b + *bl, "        ");
 736}
 737
 738void transport_dump_vpd_proto_id(
 739        struct t10_vpd *vpd,
 740        unsigned char *p_buf,
 741        int p_buf_len)
 742{
 743        unsigned char buf[VPD_TMP_BUF_SIZE];
 744        int len;
 745
 746        memset(buf, 0, VPD_TMP_BUF_SIZE);
 747        len = sprintf(buf, "T10 VPD Protocol Identifier: ");
 748
 749        switch (vpd->protocol_identifier) {
 750        case 0x00:
 751                sprintf(buf+len, "Fibre Channel\n");
 752                break;
 753        case 0x10:
 754                sprintf(buf+len, "Parallel SCSI\n");
 755                break;
 756        case 0x20:
 757                sprintf(buf+len, "SSA\n");
 758                break;
 759        case 0x30:
 760                sprintf(buf+len, "IEEE 1394\n");
 761                break;
 762        case 0x40:
 763                sprintf(buf+len, "SCSI Remote Direct Memory Access"
 764                                " Protocol\n");
 765                break;
 766        case 0x50:
 767                sprintf(buf+len, "Internet SCSI (iSCSI)\n");
 768                break;
 769        case 0x60:
 770                sprintf(buf+len, "SAS Serial SCSI Protocol\n");
 771                break;
 772        case 0x70:
 773                sprintf(buf+len, "Automation/Drive Interface Transport"
 774                                " Protocol\n");
 775                break;
 776        case 0x80:
 777                sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
 778                break;
 779        default:
 780                sprintf(buf+len, "Unknown 0x%02x\n",
 781                                vpd->protocol_identifier);
 782                break;
 783        }
 784
 785        if (p_buf)
 786                strncpy(p_buf, buf, p_buf_len);
 787        else
 788                pr_debug("%s", buf);
 789}
 790
 791void
 792transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
 793{
 794        /*
 795         * Check if the Protocol Identifier Valid (PIV) bit is set..
 796         *
 797         * from spc3r23.pdf section 7.5.1
 798         */
 799         if (page_83[1] & 0x80) {
 800                vpd->protocol_identifier = (page_83[0] & 0xf0);
 801                vpd->protocol_identifier_set = 1;
 802                transport_dump_vpd_proto_id(vpd, NULL, 0);
 803        }
 804}
 805EXPORT_SYMBOL(transport_set_vpd_proto_id);
 806
 807int transport_dump_vpd_assoc(
 808        struct t10_vpd *vpd,
 809        unsigned char *p_buf,
 810        int p_buf_len)
 811{
 812        unsigned char buf[VPD_TMP_BUF_SIZE];
 813        int ret = 0;
 814        int len;
 815
 816        memset(buf, 0, VPD_TMP_BUF_SIZE);
 817        len = sprintf(buf, "T10 VPD Identifier Association: ");
 818
 819        switch (vpd->association) {
 820        case 0x00:
 821                sprintf(buf+len, "addressed logical unit\n");
 822                break;
 823        case 0x10:
 824                sprintf(buf+len, "target port\n");
 825                break;
 826        case 0x20:
 827                sprintf(buf+len, "SCSI target device\n");
 828                break;
 829        default:
 830                sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
 831                ret = -EINVAL;
 832                break;
 833        }
 834
 835        if (p_buf)
 836                strncpy(p_buf, buf, p_buf_len);
 837        else
 838                pr_debug("%s", buf);
 839
 840        return ret;
 841}
 842
 843int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
 844{
 845        /*
 846         * The VPD identification association..
 847         *
 848         * from spc3r23.pdf Section 7.6.3.1 Table 297
 849         */
 850        vpd->association = (page_83[1] & 0x30);
 851        return transport_dump_vpd_assoc(vpd, NULL, 0);
 852}
 853EXPORT_SYMBOL(transport_set_vpd_assoc);
 854
 855int transport_dump_vpd_ident_type(
 856        struct t10_vpd *vpd,
 857        unsigned char *p_buf,
 858        int p_buf_len)
 859{
 860        unsigned char buf[VPD_TMP_BUF_SIZE];
 861        int ret = 0;
 862        int len;
 863
 864        memset(buf, 0, VPD_TMP_BUF_SIZE);
 865        len = sprintf(buf, "T10 VPD Identifier Type: ");
 866
 867        switch (vpd->device_identifier_type) {
 868        case 0x00:
 869                sprintf(buf+len, "Vendor specific\n");
 870                break;
 871        case 0x01:
 872                sprintf(buf+len, "T10 Vendor ID based\n");
 873                break;
 874        case 0x02:
 875                sprintf(buf+len, "EUI-64 based\n");
 876                break;
 877        case 0x03:
 878                sprintf(buf+len, "NAA\n");
 879                break;
 880        case 0x04:
 881                sprintf(buf+len, "Relative target port identifier\n");
 882                break;
 883        case 0x08:
 884                sprintf(buf+len, "SCSI name string\n");
 885                break;
 886        default:
 887                sprintf(buf+len, "Unsupported: 0x%02x\n",
 888                                vpd->device_identifier_type);
 889                ret = -EINVAL;
 890                break;
 891        }
 892
 893        if (p_buf) {
 894                if (p_buf_len < strlen(buf)+1)
 895                        return -EINVAL;
 896                strncpy(p_buf, buf, p_buf_len);
 897        } else {
 898                pr_debug("%s", buf);
 899        }
 900
 901        return ret;
 902}
 903
 904int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
 905{
 906        /*
 907         * The VPD identifier type..
 908         *
 909         * from spc3r23.pdf Section 7.6.3.1 Table 298
 910         */
 911        vpd->device_identifier_type = (page_83[1] & 0x0f);
 912        return transport_dump_vpd_ident_type(vpd, NULL, 0);
 913}
 914EXPORT_SYMBOL(transport_set_vpd_ident_type);
 915
 916int transport_dump_vpd_ident(
 917        struct t10_vpd *vpd,
 918        unsigned char *p_buf,
 919        int p_buf_len)
 920{
 921        unsigned char buf[VPD_TMP_BUF_SIZE];
 922        int ret = 0;
 923
 924        memset(buf, 0, VPD_TMP_BUF_SIZE);
 925
 926        switch (vpd->device_identifier_code_set) {
 927        case 0x01: /* Binary */
 928                sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
 929                        &vpd->device_identifier[0]);
 930                break;
 931        case 0x02: /* ASCII */
 932                sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
 933                        &vpd->device_identifier[0]);
 934                break;
 935        case 0x03: /* UTF-8 */
 936                sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
 937                        &vpd->device_identifier[0]);
 938                break;
 939        default:
 940                sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
 941                        " 0x%02x", vpd->device_identifier_code_set);
 942                ret = -EINVAL;
 943                break;
 944        }
 945
 946        if (p_buf)
 947                strncpy(p_buf, buf, p_buf_len);
 948        else
 949                pr_debug("%s", buf);
 950
 951        return ret;
 952}
 953
 954int
 955transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
 956{
 957        static const char hex_str[] = "0123456789abcdef";
 958        int j = 0, i = 4; /* offset to start of the identifier */
 959
 960        /*
 961         * The VPD Code Set (encoding)
 962         *
 963         * from spc3r23.pdf Section 7.6.3.1 Table 296
 964         */
 965        vpd->device_identifier_code_set = (page_83[0] & 0x0f);
 966        switch (vpd->device_identifier_code_set) {
 967        case 0x01: /* Binary */
 968                vpd->device_identifier[j++] =
 969                                hex_str[vpd->device_identifier_type];
 970                while (i < (4 + page_83[3])) {
 971                        vpd->device_identifier[j++] =
 972                                hex_str[(page_83[i] & 0xf0) >> 4];
 973                        vpd->device_identifier[j++] =
 974                                hex_str[page_83[i] & 0x0f];
 975                        i++;
 976                }
 977                break;
 978        case 0x02: /* ASCII */
 979        case 0x03: /* UTF-8 */
 980                while (i < (4 + page_83[3]))
 981                        vpd->device_identifier[j++] = page_83[i++];
 982                break;
 983        default:
 984                break;
 985        }
 986
 987        return transport_dump_vpd_ident(vpd, NULL, 0);
 988}
 989EXPORT_SYMBOL(transport_set_vpd_ident);
 990
 991static void core_setup_task_attr_emulation(struct se_device *dev)
 992{
 993        /*
 994         * If this device is from Target_Core_Mod/pSCSI, disable the
 995         * SAM Task Attribute emulation.
 996         *
 997         * This is currently not available in upsream Linux/SCSI Target
 998         * mode code, and is assumed to be disabled while using TCM/pSCSI.
 999         */
1000        if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
1001                dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
1002                return;
1003        }
1004
1005        dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
1006        pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
1007                " device\n", dev->transport->name,
1008                dev->transport->get_device_rev(dev));
1009}
1010
1011static void scsi_dump_inquiry(struct se_device *dev)
1012{
1013        struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
1014        char buf[17];
1015        int i, device_type;
1016        /*
1017         * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
1018         */
1019        for (i = 0; i < 8; i++)
1020                if (wwn->vendor[i] >= 0x20)
1021                        buf[i] = wwn->vendor[i];
1022                else
1023                        buf[i] = ' ';
1024        buf[i] = '\0';
1025        pr_debug("  Vendor: %s\n", buf);
1026
1027        for (i = 0; i < 16; i++)
1028                if (wwn->model[i] >= 0x20)
1029                        buf[i] = wwn->model[i];
1030                else
1031                        buf[i] = ' ';
1032        buf[i] = '\0';
1033        pr_debug("  Model: %s\n", buf);
1034
1035        for (i = 0; i < 4; i++)
1036                if (wwn->revision[i] >= 0x20)
1037                        buf[i] = wwn->revision[i];
1038                else
1039                        buf[i] = ' ';
1040        buf[i] = '\0';
1041        pr_debug("  Revision: %s\n", buf);
1042
1043        device_type = dev->transport->get_device_type(dev);
1044        pr_debug("  Type:   %s ", scsi_device_type(device_type));
1045        pr_debug("                 ANSI SCSI revision: %02x\n",
1046                                dev->transport->get_device_rev(dev));
1047}
1048
1049struct se_device *transport_add_device_to_core_hba(
1050        struct se_hba *hba,
1051        struct se_subsystem_api *transport,
1052        struct se_subsystem_dev *se_dev,
1053        u32 device_flags,
1054        void *transport_dev,
1055        struct se_dev_limits *dev_limits,
1056        const char *inquiry_prod,
1057        const char *inquiry_rev)
1058{
1059        int force_pt;
1060        struct se_device  *dev;
1061
1062        dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
1063        if (!dev) {
1064                pr_err("Unable to allocate memory for se_dev_t\n");
1065                return NULL;
1066        }
1067
1068        dev->dev_flags          = device_flags;
1069        dev->dev_status         |= TRANSPORT_DEVICE_DEACTIVATED;
1070        dev->dev_ptr            = transport_dev;
1071        dev->se_hba             = hba;
1072        dev->se_sub_dev         = se_dev;
1073        dev->transport          = transport;
1074        dev->dev_link_magic     = SE_DEV_LINK_MAGIC;
1075        INIT_LIST_HEAD(&dev->dev_list);
1076        INIT_LIST_HEAD(&dev->dev_sep_list);
1077        INIT_LIST_HEAD(&dev->dev_tmr_list);
1078        INIT_LIST_HEAD(&dev->delayed_cmd_list);
1079        INIT_LIST_HEAD(&dev->state_list);
1080        INIT_LIST_HEAD(&dev->qf_cmd_list);
1081        spin_lock_init(&dev->execute_task_lock);
1082        spin_lock_init(&dev->delayed_cmd_lock);
1083        spin_lock_init(&dev->dev_reservation_lock);
1084        spin_lock_init(&dev->dev_status_lock);
1085        spin_lock_init(&dev->se_port_lock);
1086        spin_lock_init(&dev->se_tmr_lock);
1087        spin_lock_init(&dev->qf_cmd_lock);
1088        atomic_set(&dev->dev_ordered_id, 0);
1089
1090        se_dev_set_default_attribs(dev, dev_limits);
1091
1092        dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
1093        dev->creation_time = get_jiffies_64();
1094        spin_lock_init(&dev->stats_lock);
1095
1096        spin_lock(&hba->device_lock);
1097        list_add_tail(&dev->dev_list, &hba->hba_dev_list);
1098        hba->dev_count++;
1099        spin_unlock(&hba->device_lock);
1100        /*
1101         * Setup the SAM Task Attribute emulation for struct se_device
1102         */
1103        core_setup_task_attr_emulation(dev);
1104        /*
1105         * Force PR and ALUA passthrough emulation with internal object use.
1106         */
1107        force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
1108        /*
1109         * Setup the Reservations infrastructure for struct se_device
1110         */
1111        core_setup_reservations(dev, force_pt);
1112        /*
1113         * Setup the Asymmetric Logical Unit Assignment for struct se_device
1114         */
1115        if (core_setup_alua(dev, force_pt) < 0)
1116                goto err_dev_list;
1117
1118        /*
1119         * Startup the struct se_device processing thread
1120         */
1121        dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
1122                                      dev->transport->name);
1123        if (!dev->tmr_wq) {
1124                pr_err("Unable to create tmr workqueue for %s\n",
1125                        dev->transport->name);
1126                goto err_dev_list;
1127        }
1128        /*
1129         * Setup work_queue for QUEUE_FULL
1130         */
1131        INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
1132        /*
1133         * Preload the initial INQUIRY const values if we are doing
1134         * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
1135         * passthrough because this is being provided by the backend LLD.
1136         * This is required so that transport_get_inquiry() copies these
1137         * originals once back into DEV_T10_WWN(dev) for the virtual device
1138         * setup.
1139         */
1140        if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
1141                if (!inquiry_prod || !inquiry_rev) {
1142                        pr_err("All non TCM/pSCSI plugins require"
1143                                " INQUIRY consts\n");
1144                        goto err_wq;
1145                }
1146
1147                strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
1148                strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
1149                strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
1150        }
1151        scsi_dump_inquiry(dev);
1152
1153        return dev;
1154
1155err_wq:
1156        destroy_workqueue(dev->tmr_wq);
1157err_dev_list:
1158        spin_lock(&hba->device_lock);
1159        list_del(&dev->dev_list);
1160        hba->dev_count--;
1161        spin_unlock(&hba->device_lock);
1162
1163        se_release_vpd_for_dev(dev);
1164
1165        kfree(dev);
1166
1167        return NULL;
1168}
1169EXPORT_SYMBOL(transport_add_device_to_core_hba);
1170
1171int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
1172{
1173        struct se_device *dev = cmd->se_dev;
1174
1175        if (cmd->unknown_data_length) {
1176                cmd->data_length = size;
1177        } else if (size != cmd->data_length) {
1178                pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1179                        " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1180                        " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1181                                cmd->data_length, size, cmd->t_task_cdb[0]);
1182
1183                if (cmd->data_direction == DMA_TO_DEVICE) {
1184                        pr_err("Rejecting underflow/overflow"
1185                                        " WRITE data\n");
1186                        goto out_invalid_cdb_field;
1187                }
1188                /*
1189                 * Reject READ_* or WRITE_* with overflow/underflow for
1190                 * type SCF_SCSI_DATA_CDB.
1191                 */
1192                if (dev->se_sub_dev->se_dev_attrib.block_size != 512)  {
1193                        pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1194                                " CDB on non 512-byte sector setup subsystem"
1195                                " plugin: %s\n", dev->transport->name);
1196                        /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
1197                        goto out_invalid_cdb_field;
1198                }
1199                /*
1200                 * For the overflow case keep the existing fabric provided
1201                 * ->data_length.  Otherwise for the underflow case, reset
1202                 * ->data_length to the smaller SCSI expected data transfer
1203                 * length.
1204                 */
1205                if (size > cmd->data_length) {
1206                        cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1207                        cmd->residual_count = (size - cmd->data_length);
1208                } else {
1209                        cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1210                        cmd->residual_count = (cmd->data_length - size);
1211                        cmd->data_length = size;
1212                }
1213        }
1214
1215        return 0;
1216
1217out_invalid_cdb_field:
1218        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1219        cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1220        return -EINVAL;
1221}
1222
1223/*
1224 * Used by fabric modules containing a local struct se_cmd within their
1225 * fabric dependent per I/O descriptor.
1226 */
1227void transport_init_se_cmd(
1228        struct se_cmd *cmd,
1229        struct target_core_fabric_ops *tfo,
1230        struct se_session *se_sess,
1231        u32 data_length,
1232        int data_direction,
1233        int task_attr,
1234        unsigned char *sense_buffer)
1235{
1236        INIT_LIST_HEAD(&cmd->se_lun_node);
1237        INIT_LIST_HEAD(&cmd->se_delayed_node);
1238        INIT_LIST_HEAD(&cmd->se_qf_node);
1239        INIT_LIST_HEAD(&cmd->se_cmd_list);
1240        INIT_LIST_HEAD(&cmd->state_list);
1241        init_completion(&cmd->transport_lun_fe_stop_comp);
1242        init_completion(&cmd->transport_lun_stop_comp);
1243        init_completion(&cmd->t_transport_stop_comp);
1244        init_completion(&cmd->cmd_wait_comp);
1245        init_completion(&cmd->task_stop_comp);
1246        spin_lock_init(&cmd->t_state_lock);
1247        cmd->transport_state = CMD_T_DEV_ACTIVE;
1248
1249        cmd->se_tfo = tfo;
1250        cmd->se_sess = se_sess;
1251        cmd->data_length = data_length;
1252        cmd->data_direction = data_direction;
1253        cmd->sam_task_attr = task_attr;
1254        cmd->sense_buffer = sense_buffer;
1255
1256        cmd->state_active = false;
1257}
1258EXPORT_SYMBOL(transport_init_se_cmd);
1259
1260static int transport_check_alloc_task_attr(struct se_cmd *cmd)
1261{
1262        /*
1263         * Check if SAM Task Attribute emulation is enabled for this
1264         * struct se_device storage object
1265         */
1266        if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1267                return 0;
1268
1269        if (cmd->sam_task_attr == MSG_ACA_TAG) {
1270                pr_debug("SAM Task Attribute ACA"
1271                        " emulation is not supported\n");
1272                return -EINVAL;
1273        }
1274        /*
1275         * Used to determine when ORDERED commands should go from
1276         * Dormant to Active status.
1277         */
1278        cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
1279        smp_mb__after_atomic_inc();
1280        pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
1281                        cmd->se_ordered_id, cmd->sam_task_attr,
1282                        cmd->se_dev->transport->name);
1283        return 0;
1284}
1285
1286/*      target_setup_cmd_from_cdb():
1287 *
1288 *      Called from fabric RX Thread.
1289 */
1290int target_setup_cmd_from_cdb(
1291        struct se_cmd *cmd,
1292        unsigned char *cdb)
1293{
1294        struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
1295        u32 pr_reg_type = 0;
1296        u8 alua_ascq = 0;
1297        unsigned long flags;
1298        int ret;
1299
1300        /*
1301         * Ensure that the received CDB is less than the max (252 + 8) bytes
1302         * for VARIABLE_LENGTH_CMD
1303         */
1304        if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
1305                pr_err("Received SCSI CDB with command_size: %d that"
1306                        " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1307                        scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
1308                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1309                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1310                return -EINVAL;
1311        }
1312        /*
1313         * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1314         * allocate the additional extended CDB buffer now..  Otherwise
1315         * setup the pointer from __t_task_cdb to t_task_cdb.
1316         */
1317        if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1318                cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
1319                                                GFP_KERNEL);
1320                if (!cmd->t_task_cdb) {
1321                        pr_err("Unable to allocate cmd->t_task_cdb"
1322                                " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
1323                                scsi_command_size(cdb),
1324                                (unsigned long)sizeof(cmd->__t_task_cdb));
1325                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1326                        cmd->scsi_sense_reason =
1327                                        TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1328                        return -ENOMEM;
1329                }
1330        } else
1331                cmd->t_task_cdb = &cmd->__t_task_cdb[0];
1332        /*
1333         * Copy the original CDB into cmd->
1334         */
1335        memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
1336
1337        /*
1338         * Check for an existing UNIT ATTENTION condition
1339         */
1340        if (core_scsi3_ua_check(cmd, cdb) < 0) {
1341                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1342                cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
1343                return -EINVAL;
1344        }
1345
1346        ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
1347        if (ret != 0) {
1348                /*
1349                 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
1350                 * The ALUA additional sense code qualifier (ASCQ) is determined
1351                 * by the ALUA primary or secondary access state..
1352                 */
1353                if (ret > 0) {
1354                        pr_debug("[%s]: ALUA TG Port not available, "
1355                                "SenseKey: NOT_READY, ASC/ASCQ: "
1356                                "0x04/0x%02x\n",
1357                                cmd->se_tfo->get_fabric_name(), alua_ascq);
1358
1359                        transport_set_sense_codes(cmd, 0x04, alua_ascq);
1360                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1361                        cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
1362                        return -EINVAL;
1363                }
1364                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1365                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1366                return -EINVAL;
1367        }
1368
1369        /*
1370         * Check status for SPC-3 Persistent Reservations
1371         */
1372        if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
1373                if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
1374                                        cmd, cdb, pr_reg_type) != 0) {
1375                        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1376                        cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
1377                        cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1378                        cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
1379                        return -EBUSY;
1380                }
1381                /*
1382                 * This means the CDB is allowed for the SCSI Initiator port
1383                 * when said port is *NOT* holding the legacy SPC-2 or
1384                 * SPC-3 Persistent Reservation.
1385                 */
1386        }
1387
1388        ret = cmd->se_dev->transport->parse_cdb(cmd);
1389        if (ret < 0)
1390                return ret;
1391
1392        spin_lock_irqsave(&cmd->t_state_lock, flags);
1393        cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
1394        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
1395
1396        /*
1397         * Check for SAM Task Attribute Emulation
1398         */
1399        if (transport_check_alloc_task_attr(cmd) < 0) {
1400                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1401                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
1402                return -EINVAL;
1403        }
1404        spin_lock(&cmd->se_lun->lun_sep_lock);
1405        if (cmd->se_lun->lun_sep)
1406                cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1407        spin_unlock(&cmd->se_lun->lun_sep_lock);
1408        return 0;
1409}
1410EXPORT_SYMBOL(target_setup_cmd_from_cdb);
1411
1412/*
1413 * Used by fabric module frontends to queue tasks directly.
1414 * Many only be used from process context only
1415 */
1416int transport_handle_cdb_direct(
1417        struct se_cmd *cmd)
1418{
1419        int ret;
1420
1421        if (!cmd->se_lun) {
1422                dump_stack();
1423                pr_err("cmd->se_lun is NULL\n");
1424                return -EINVAL;
1425        }
1426        if (in_interrupt()) {
1427                dump_stack();
1428                pr_err("transport_generic_handle_cdb cannot be called"
1429                                " from interrupt context\n");
1430                return -EINVAL;
1431        }
1432        /*
1433         * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1434         * outstanding descriptors are handled correctly during shutdown via
1435         * transport_wait_for_tasks()
1436         *
1437         * Also, we don't take cmd->t_state_lock here as we only expect
1438         * this to be called for initial descriptor submission.
1439         */
1440        cmd->t_state = TRANSPORT_NEW_CMD;
1441        cmd->transport_state |= CMD_T_ACTIVE;
1442
1443        /*
1444         * transport_generic_new_cmd() is already handling QUEUE_FULL,
1445         * so follow TRANSPORT_NEW_CMD processing thread context usage
1446         * and call transport_generic_request_failure() if necessary..
1447         */
1448        ret = transport_generic_new_cmd(cmd);
1449        if (ret < 0)
1450                transport_generic_request_failure(cmd);
1451
1452        return 0;
1453}
1454EXPORT_SYMBOL(transport_handle_cdb_direct);
1455
1456/*
1457 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1458 *                       se_cmd + use pre-allocated SGL memory.
1459 *
1460 * @se_cmd: command descriptor to submit
1461 * @se_sess: associated se_sess for endpoint
1462 * @cdb: pointer to SCSI CDB
1463 * @sense: pointer to SCSI sense buffer
1464 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1465 * @data_length: fabric expected data transfer length
1466 * @task_addr: SAM task attribute
1467 * @data_dir: DMA data direction
1468 * @flags: flags for command submission from target_sc_flags_tables
1469 * @sgl: struct scatterlist memory for unidirectional mapping
1470 * @sgl_count: scatterlist count for unidirectional mapping
1471 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1472 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
1473 *
1474 * Returns non zero to signal active I/O shutdown failure.  All other
1475 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1476 * but still return zero here.
1477 *
1478 * This may only be called from process context, and also currently
1479 * assumes internal allocation of fabric payload buffer by target-core.
1480 */
1481int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
1482                unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1483                u32 data_length, int task_attr, int data_dir, int flags,
1484                struct scatterlist *sgl, u32 sgl_count,
1485                struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1486{
1487        struct se_portal_group *se_tpg;
1488        int rc;
1489
1490        se_tpg = se_sess->se_tpg;
1491        BUG_ON(!se_tpg);
1492        BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1493        BUG_ON(in_interrupt());
1494        /*
1495         * Initialize se_cmd for target operation.  From this point
1496         * exceptions are handled by sending exception status via
1497         * target_core_fabric_ops->queue_status() callback
1498         */
1499        transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1500                                data_length, data_dir, task_attr, sense);
1501        if (flags & TARGET_SCF_UNKNOWN_SIZE)
1502                se_cmd->unknown_data_length = 1;
1503        /*
1504         * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1505         * se_sess->sess_cmd_list.  A second kref_get here is necessary
1506         * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1507         * kref_put() to happen during fabric packet acknowledgement.
1508         */
1509        rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1510        if (rc)
1511                return rc;
1512        /*
1513         * Signal bidirectional data payloads to target-core
1514         */
1515        if (flags & TARGET_SCF_BIDI_OP)
1516                se_cmd->se_cmd_flags |= SCF_BIDI;
1517        /*
1518         * Locate se_lun pointer and attach it to struct se_cmd
1519         */
1520        if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
1521                transport_send_check_condition_and_sense(se_cmd,
1522                                se_cmd->scsi_sense_reason, 0);
1523                target_put_sess_cmd(se_sess, se_cmd);
1524                return 0;
1525        }
1526
1527        rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1528        if (rc != 0) {
1529                transport_generic_request_failure(se_cmd);
1530                return 0;
1531        }
1532        /*
1533         * When a non zero sgl_count has been passed perform SGL passthrough
1534         * mapping for pre-allocated fabric memory instead of having target
1535         * core perform an internal SGL allocation..
1536         */
1537        if (sgl_count != 0) {
1538                BUG_ON(!sgl);
1539
1540                /*
1541                 * A work-around for tcm_loop as some userspace code via
1542                 * scsi-generic do not memset their associated read buffers,
1543                 * so go ahead and do that here for type non-data CDBs.  Also
1544                 * note that this is currently guaranteed to be a single SGL
1545                 * for this case by target core in target_setup_cmd_from_cdb()
1546                 * -> transport_generic_cmd_sequencer().
1547                 */
1548                if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1549                     se_cmd->data_direction == DMA_FROM_DEVICE) {
1550                        unsigned char *buf = NULL;
1551
1552                        if (sgl)
1553                                buf = kmap(sg_page(sgl)) + sgl->offset;
1554
1555                        if (buf) {
1556                                memset(buf, 0, sgl->length);
1557                                kunmap(sg_page(sgl));
1558                        }
1559                }
1560
1561                rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1562                                sgl_bidi, sgl_bidi_count);
1563                if (rc != 0) {
1564                        transport_generic_request_failure(se_cmd);
1565                        return 0;
1566                }
1567        }
1568        /*
1569         * Check if we need to delay processing because of ALUA
1570         * Active/NonOptimized primary access state..
1571         */
1572        core_alua_check_nonop_delay(se_cmd);
1573
1574        transport_handle_cdb_direct(se_cmd);
1575        return 0;
1576}
1577EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1578
1579/*
1580 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1581 *
1582 * @se_cmd: command descriptor to submit
1583 * @se_sess: associated se_sess for endpoint
1584 * @cdb: pointer to SCSI CDB
1585 * @sense: pointer to SCSI sense buffer
1586 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1587 * @data_length: fabric expected data transfer length
1588 * @task_addr: SAM task attribute
1589 * @data_dir: DMA data direction
1590 * @flags: flags for command submission from target_sc_flags_tables
1591 *
1592 * Returns non zero to signal active I/O shutdown failure.  All other
1593 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1594 * but still return zero here.
1595 *
1596 * This may only be called from process context, and also currently
1597 * assumes internal allocation of fabric payload buffer by target-core.
1598 *
1599 * It also assumes interal target core SGL memory allocation.
1600 */
1601int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1602                unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1603                u32 data_length, int task_attr, int data_dir, int flags)
1604{
1605        return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1606                        unpacked_lun, data_length, task_attr, data_dir,
1607                        flags, NULL, 0, NULL, 0);
1608}
1609EXPORT_SYMBOL(target_submit_cmd);
1610
1611static void target_complete_tmr_failure(struct work_struct *work)
1612{
1613        struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1614
1615        se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1616        se_cmd->se_tfo->queue_tm_rsp(se_cmd);
1617
1618        transport_cmd_check_stop_to_fabric(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        cmd->transport_state |= CMD_T_ACTIVE;
1857        spin_unlock_irq(&cmd->t_state_lock);
1858
1859        if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
1860                goto execute;
1861
1862        /*
1863         * Check for the existence of HEAD_OF_QUEUE, and if true return 1
1864         * to allow the passed struct se_cmd list of tasks to the front of the list.
1865         */
1866        switch (cmd->sam_task_attr) {
1867        case MSG_HEAD_TAG:
1868                pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1869                         "se_ordered_id: %u\n",
1870                         cmd->t_task_cdb[0], cmd->se_ordered_id);
1871                goto execute;
1872        case MSG_ORDERED_TAG:
1873                atomic_inc(&dev->dev_ordered_sync);
1874                smp_mb__after_atomic_inc();
1875
1876                pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1877                         " se_ordered_id: %u\n",
1878                         cmd->t_task_cdb[0], cmd->se_ordered_id);
1879
1880                /*
1881                 * Execute an ORDERED command if no other older commands
1882                 * exist that need to be completed first.
1883                 */
1884                if (!atomic_read(&dev->simple_cmds))
1885                        goto execute;
1886                break;
1887        default:
1888                /*
1889                 * For SIMPLE and UNTAGGED Task Attribute commands
1890                 */
1891                atomic_inc(&dev->simple_cmds);
1892                smp_mb__after_atomic_inc();
1893                break;
1894        }
1895
1896        if (atomic_read(&dev->dev_ordered_sync) != 0) {
1897                spin_lock(&dev->delayed_cmd_lock);
1898                list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1899                spin_unlock(&dev->delayed_cmd_lock);
1900
1901                pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1902                        " delayed CMD list, se_ordered_id: %u\n",
1903                        cmd->t_task_cdb[0], cmd->sam_task_attr,
1904                        cmd->se_ordered_id);
1905                return;
1906        }
1907
1908execute:
1909        /*
1910         * Otherwise, no ORDERED task attributes exist..
1911         */
1912        __target_execute_cmd(cmd);
1913}
1914EXPORT_SYMBOL(target_execute_cmd);
1915
1916/*
1917 * Process all commands up to the last received ORDERED task attribute which
1918 * requires another blocking boundary
1919 */
1920static void target_restart_delayed_cmds(struct se_device *dev)
1921{
1922        for (;;) {
1923                struct se_cmd *cmd;
1924
1925                spin_lock(&dev->delayed_cmd_lock);
1926                if (list_empty(&dev->delayed_cmd_list)) {
1927                        spin_unlock(&dev->delayed_cmd_lock);
1928                        break;
1929                }
1930
1931                cmd = list_entry(dev->delayed_cmd_list.next,
1932                                 struct se_cmd, se_delayed_node);
1933                list_del(&cmd->se_delayed_node);
1934                spin_unlock(&dev->delayed_cmd_lock);
1935
1936                __target_execute_cmd(cmd);
1937
1938                if (cmd->sam_task_attr == MSG_ORDERED_TAG)
1939                        break;
1940        }
1941}
1942
1943/*
1944 * Called from I/O completion to determine which dormant/delayed
1945 * and ordered cmds need to have their tasks added to the execution queue.
1946 */
1947static void transport_complete_task_attr(struct se_cmd *cmd)
1948{
1949        struct se_device *dev = cmd->se_dev;
1950
1951        if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
1952                atomic_dec(&dev->simple_cmds);
1953                smp_mb__after_atomic_dec();
1954                dev->dev_cur_ordered_id++;
1955                pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
1956                        " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1957                        cmd->se_ordered_id);
1958        } else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
1959                dev->dev_cur_ordered_id++;
1960                pr_debug("Incremented dev_cur_ordered_id: %u for"
1961                        " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1962                        cmd->se_ordered_id);
1963        } else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
1964                atomic_dec(&dev->dev_ordered_sync);
1965                smp_mb__after_atomic_dec();
1966
1967                dev->dev_cur_ordered_id++;
1968                pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
1969                        " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1970        }
1971
1972        target_restart_delayed_cmds(dev);
1973}
1974
1975static void transport_complete_qf(struct se_cmd *cmd)
1976{
1977        int ret = 0;
1978
1979        if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
1980                transport_complete_task_attr(cmd);
1981
1982        if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
1983                ret = cmd->se_tfo->queue_status(cmd);
1984                if (ret)
1985                        goto out;
1986        }
1987
1988        switch (cmd->data_direction) {
1989        case DMA_FROM_DEVICE:
1990                ret = cmd->se_tfo->queue_data_in(cmd);
1991                break;
1992        case DMA_TO_DEVICE:
1993                if (cmd->t_bidi_data_sg) {
1994                        ret = cmd->se_tfo->queue_data_in(cmd);
1995                        if (ret < 0)
1996                                break;
1997                }
1998                /* Fall through for DMA_TO_DEVICE */
1999        case DMA_NONE:
2000                ret = cmd->se_tfo->queue_status(cmd);
2001                break;
2002        default:
2003                break;
2004        }
2005
2006out:
2007        if (ret < 0) {
2008                transport_handle_queue_full(cmd, cmd->se_dev);
2009                return;
2010        }
2011        transport_lun_remove_cmd(cmd);
2012        transport_cmd_check_stop_to_fabric(cmd);
2013}
2014
2015static void transport_handle_queue_full(
2016        struct se_cmd *cmd,
2017        struct se_device *dev)
2018{
2019        spin_lock_irq(&dev->qf_cmd_lock);
2020        list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
2021        atomic_inc(&dev->dev_qf_count);
2022        smp_mb__after_atomic_inc();
2023        spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
2024
2025        schedule_work(&cmd->se_dev->qf_work_queue);
2026}
2027
2028static void target_complete_ok_work(struct work_struct *work)
2029{
2030        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
2031        int ret;
2032
2033        /*
2034         * Check if we need to move delayed/dormant tasks from cmds on the
2035         * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2036         * Attribute.
2037         */
2038        if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
2039                transport_complete_task_attr(cmd);
2040        /*
2041         * Check to schedule QUEUE_FULL work, or execute an existing
2042         * cmd->transport_qf_callback()
2043         */
2044        if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2045                schedule_work(&cmd->se_dev->qf_work_queue);
2046
2047        /*
2048         * Check if we need to send a sense buffer from
2049         * the struct se_cmd in question.
2050         */
2051        if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
2052                WARN_ON(!cmd->scsi_status);
2053                ret = transport_send_check_condition_and_sense(
2054                                        cmd, 0, 1);
2055                if (ret == -EAGAIN || ret == -ENOMEM)
2056                        goto queue_full;
2057
2058                transport_lun_remove_cmd(cmd);
2059                transport_cmd_check_stop_to_fabric(cmd);
2060                return;
2061        }
2062        /*
2063         * Check for a callback, used by amongst other things
2064         * XDWRITE_READ_10 emulation.
2065         */
2066        if (cmd->transport_complete_callback)
2067                cmd->transport_complete_callback(cmd);
2068
2069        switch (cmd->data_direction) {
2070        case DMA_FROM_DEVICE:
2071                spin_lock(&cmd->se_lun->lun_sep_lock);
2072                if (cmd->se_lun->lun_sep) {
2073                        cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2074                                        cmd->data_length;
2075                }
2076                spin_unlock(&cmd->se_lun->lun_sep_lock);
2077
2078                ret = cmd->se_tfo->queue_data_in(cmd);
2079                if (ret == -EAGAIN || ret == -ENOMEM)
2080                        goto queue_full;
2081                break;
2082        case DMA_TO_DEVICE:
2083                spin_lock(&cmd->se_lun->lun_sep_lock);
2084                if (cmd->se_lun->lun_sep) {
2085                        cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
2086                                cmd->data_length;
2087                }
2088                spin_unlock(&cmd->se_lun->lun_sep_lock);
2089                /*
2090                 * Check if we need to send READ payload for BIDI-COMMAND
2091                 */
2092                if (cmd->t_bidi_data_sg) {
2093                        spin_lock(&cmd->se_lun->lun_sep_lock);
2094                        if (cmd->se_lun->lun_sep) {
2095                                cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
2096                                        cmd->data_length;
2097                        }
2098                        spin_unlock(&cmd->se_lun->lun_sep_lock);
2099                        ret = cmd->se_tfo->queue_data_in(cmd);
2100                        if (ret == -EAGAIN || ret == -ENOMEM)
2101                                goto queue_full;
2102                        break;
2103                }
2104                /* Fall through for DMA_TO_DEVICE */
2105        case DMA_NONE:
2106                ret = cmd->se_tfo->queue_status(cmd);
2107                if (ret == -EAGAIN || ret == -ENOMEM)
2108                        goto queue_full;
2109                break;
2110        default:
2111                break;
2112        }
2113
2114        transport_lun_remove_cmd(cmd);
2115        transport_cmd_check_stop_to_fabric(cmd);
2116        return;
2117
2118queue_full:
2119        pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
2120                " data_direction: %d\n", cmd, cmd->data_direction);
2121        cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2122        transport_handle_queue_full(cmd, cmd->se_dev);
2123}
2124
2125static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
2126{
2127        struct scatterlist *sg;
2128        int count;
2129
2130        for_each_sg(sgl, sg, nents, count)
2131                __free_page(sg_page(sg));
2132
2133        kfree(sgl);
2134}
2135
2136static inline void transport_free_pages(struct se_cmd *cmd)
2137{
2138        if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
2139                return;
2140
2141        transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
2142        cmd->t_data_sg = NULL;
2143        cmd->t_data_nents = 0;
2144
2145        transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
2146        cmd->t_bidi_data_sg = NULL;
2147        cmd->t_bidi_data_nents = 0;
2148}
2149
2150/**
2151 * transport_release_cmd - free a command
2152 * @cmd:       command to free
2153 *
2154 * This routine unconditionally frees a command, and reference counting
2155 * or list removal must be done in the caller.
2156 */
2157static void transport_release_cmd(struct se_cmd *cmd)
2158{
2159        BUG_ON(!cmd->se_tfo);
2160
2161        if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
2162                core_tmr_release_req(cmd->se_tmr_req);
2163        if (cmd->t_task_cdb != cmd->__t_task_cdb)
2164                kfree(cmd->t_task_cdb);
2165        /*
2166         * If this cmd has been setup with target_get_sess_cmd(), drop
2167         * the kref and call ->release_cmd() in kref callback.
2168         */
2169         if (cmd->check_release != 0) {
2170                target_put_sess_cmd(cmd->se_sess, cmd);
2171                return;
2172        }
2173        cmd->se_tfo->release_cmd(cmd);
2174}
2175
2176/**
2177 * transport_put_cmd - release a reference to a command
2178 * @cmd:       command to release
2179 *
2180 * This routine releases our reference to the command and frees it if possible.
2181 */
2182static void transport_put_cmd(struct se_cmd *cmd)
2183{
2184        unsigned long flags;
2185
2186        spin_lock_irqsave(&cmd->t_state_lock, flags);
2187        if (atomic_read(&cmd->t_fe_count)) {
2188                if (!atomic_dec_and_test(&cmd->t_fe_count))
2189                        goto out_busy;
2190        }
2191
2192        if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
2193                cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2194                target_remove_from_state_list(cmd);
2195        }
2196        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2197
2198        transport_free_pages(cmd);
2199        transport_release_cmd(cmd);
2200        return;
2201out_busy:
2202        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2203}
2204
2205/*
2206 * transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
2207 * allocating in the core.
2208 * @cmd:  Associated se_cmd descriptor
2209 * @mem:  SGL style memory for TCM WRITE / READ
2210 * @sg_mem_num: Number of SGL elements
2211 * @mem_bidi_in: SGL style memory for TCM BIDI READ
2212 * @sg_mem_bidi_num: Number of BIDI READ SGL elements
2213 *
2214 * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
2215 * of parameters.
2216 */
2217int transport_generic_map_mem_to_cmd(
2218        struct se_cmd *cmd,
2219        struct scatterlist *sgl,
2220        u32 sgl_count,
2221        struct scatterlist *sgl_bidi,
2222        u32 sgl_bidi_count)
2223{
2224        if (!sgl || !sgl_count)
2225                return 0;
2226
2227        /*
2228         * Reject SCSI data overflow with map_mem_to_cmd() as incoming
2229         * scatterlists already have been set to follow what the fabric
2230         * passes for the original expected data transfer length.
2231         */
2232        if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
2233                pr_warn("Rejecting SCSI DATA overflow for fabric using"
2234                        " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
2235                cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2236                cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
2237                return -EINVAL;
2238        }
2239
2240        cmd->t_data_sg = sgl;
2241        cmd->t_data_nents = sgl_count;
2242
2243        if (sgl_bidi && sgl_bidi_count) {
2244                cmd->t_bidi_data_sg = sgl_bidi;
2245                cmd->t_bidi_data_nents = sgl_bidi_count;
2246        }
2247        cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
2248        return 0;
2249}
2250EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
2251
2252void *transport_kmap_data_sg(struct se_cmd *cmd)
2253{
2254        struct scatterlist *sg = cmd->t_data_sg;
2255        struct page **pages;
2256        int i;
2257
2258        /*
2259         * We need to take into account a possible offset here for fabrics like
2260         * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2261         * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
2262         */
2263        if (!cmd->t_data_nents)
2264                return NULL;
2265
2266        BUG_ON(!sg);
2267        if (cmd->t_data_nents == 1)
2268                return kmap(sg_page(sg)) + sg->offset;
2269
2270        /* >1 page. use vmap */
2271        pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
2272        if (!pages) {
2273                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2274                return NULL;
2275        }
2276
2277        /* convert sg[] to pages[] */
2278        for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2279                pages[i] = sg_page(sg);
2280        }
2281
2282        cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
2283        kfree(pages);
2284        if (!cmd->t_data_vmap) {
2285                cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2286                return NULL;
2287        }
2288
2289        return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
2290}
2291EXPORT_SYMBOL(transport_kmap_data_sg);
2292
2293void transport_kunmap_data_sg(struct se_cmd *cmd)
2294{
2295        if (!cmd->t_data_nents) {
2296                return;
2297        } else if (cmd->t_data_nents == 1) {
2298                kunmap(sg_page(cmd->t_data_sg));
2299                return;
2300        }
2301
2302        vunmap(cmd->t_data_vmap);
2303        cmd->t_data_vmap = NULL;
2304}
2305EXPORT_SYMBOL(transport_kunmap_data_sg);
2306
2307static int
2308transport_generic_get_mem(struct se_cmd *cmd)
2309{
2310        u32 length = cmd->data_length;
2311        unsigned int nents;
2312        struct page *page;
2313        gfp_t zero_flag;
2314        int i = 0;
2315
2316        nents = DIV_ROUND_UP(length, PAGE_SIZE);
2317        cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
2318        if (!cmd->t_data_sg)
2319                return -ENOMEM;
2320
2321        cmd->t_data_nents = nents;
2322        sg_init_table(cmd->t_data_sg, nents);
2323
2324        zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;
2325
2326        while (length) {
2327                u32 page_len = min_t(u32, length, PAGE_SIZE);
2328                page = alloc_page(GFP_KERNEL | zero_flag);
2329                if (!page)
2330                        goto out;
2331
2332                sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
2333                length -= page_len;
2334                i++;
2335        }
2336        return 0;
2337
2338out:
2339        while (i > 0) {
2340                i--;
2341                __free_page(sg_page(&cmd->t_data_sg[i]));
2342        }
2343        kfree(cmd->t_data_sg);
2344        cmd->t_data_sg = NULL;
2345        return -ENOMEM;
2346}
2347
2348/*
2349 * Allocate any required resources to execute the command.  For writes we
2350 * might not have the payload yet, so notify the fabric via a call to
2351 * ->write_pending instead. Otherwise place it on the execution queue.
2352 */
2353int transport_generic_new_cmd(struct se_cmd *cmd)
2354{
2355        int ret = 0;
2356
2357        /*
2358         * Determine is the TCM fabric module has already allocated physical
2359         * memory, and is directly calling transport_generic_map_mem_to_cmd()
2360         * beforehand.
2361         */
2362        if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2363            cmd->data_length) {
2364                ret = transport_generic_get_mem(cmd);
2365                if (ret < 0)
2366                        goto out_fail;
2367        }
2368
2369        atomic_inc(&cmd->t_fe_count);
2370
2371        /*
2372         * If this command is not a write we can execute it right here,
2373         * for write buffers we need to notify the fabric driver first
2374         * and let it call back once the write buffers are ready.
2375         */
2376        target_add_to_state_list(cmd);
2377        if (cmd->data_direction != DMA_TO_DEVICE) {
2378                target_execute_cmd(cmd);
2379                return 0;
2380        }
2381
2382        spin_lock_irq(&cmd->t_state_lock);
2383        cmd->t_state = TRANSPORT_WRITE_PENDING;
2384        spin_unlock_irq(&cmd->t_state_lock);
2385
2386        transport_cmd_check_stop(cmd, false);
2387
2388        ret = cmd->se_tfo->write_pending(cmd);
2389        if (ret == -EAGAIN || ret == -ENOMEM)
2390                goto queue_full;
2391
2392        if (ret < 0)
2393                return ret;
2394        return 1;
2395
2396out_fail:
2397        cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
2398        cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2399        return -EINVAL;
2400queue_full:
2401        pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2402        cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2403        transport_handle_queue_full(cmd, cmd->se_dev);
2404        return 0;
2405}
2406EXPORT_SYMBOL(transport_generic_new_cmd);
2407
2408static void transport_write_pending_qf(struct se_cmd *cmd)
2409{
2410        int ret;
2411
2412        ret = cmd->se_tfo->write_pending(cmd);
2413        if (ret == -EAGAIN || ret == -ENOMEM) {
2414                pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2415                         cmd);
2416                transport_handle_queue_full(cmd, cmd->se_dev);
2417        }
2418}
2419
2420void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
2421{
2422        if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
2423                if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
2424                         transport_wait_for_tasks(cmd);
2425
2426                transport_release_cmd(cmd);
2427        } else {
2428                if (wait_for_tasks)
2429                        transport_wait_for_tasks(cmd);
2430
2431                core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
2432
2433                if (cmd->se_lun)
2434                        transport_lun_remove_cmd(cmd);
2435
2436                transport_put_cmd(cmd);
2437        }
2438}
2439EXPORT_SYMBOL(transport_generic_free_cmd);
2440
2441/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2442 * @se_sess:    session to reference
2443 * @se_cmd:     command descriptor to add
2444 * @ack_kref:   Signal that fabric will perform an ack target_put_sess_cmd()
2445 */
2446static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
2447                               bool ack_kref)
2448{
2449        unsigned long flags;
2450        int ret = 0;
2451
2452        kref_init(&se_cmd->cmd_kref);
2453        /*
2454         * Add a second kref if the fabric caller is expecting to handle
2455         * fabric acknowledgement that requires two target_put_sess_cmd()
2456         * invocations before se_cmd descriptor release.
2457         */
2458        if (ack_kref == true) {
2459                kref_get(&se_cmd->cmd_kref);
2460                se_cmd->se_cmd_flags |= SCF_ACK_KREF;
2461        }
2462
2463        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2464        if (se_sess->sess_tearing_down) {
2465                ret = -ESHUTDOWN;
2466                goto out;
2467        }
2468        list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
2469        se_cmd->check_release = 1;
2470
2471out:
2472        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2473        return ret;
2474}
2475
2476static void target_release_cmd_kref(struct kref *kref)
2477{
2478        struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2479        struct se_session *se_sess = se_cmd->se_sess;
2480        unsigned long flags;
2481
2482        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2483        if (list_empty(&se_cmd->se_cmd_list)) {
2484                spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2485                se_cmd->se_tfo->release_cmd(se_cmd);
2486                return;
2487        }
2488        if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
2489                spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2490                complete(&se_cmd->cmd_wait_comp);
2491                return;
2492        }
2493        list_del(&se_cmd->se_cmd_list);
2494        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2495
2496        se_cmd->se_tfo->release_cmd(se_cmd);
2497}
2498
2499/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2500 * @se_sess:    session to reference
2501 * @se_cmd:     command descriptor to drop
2502 */
2503int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2504{
2505        return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
2506}
2507EXPORT_SYMBOL(target_put_sess_cmd);
2508
2509/* target_sess_cmd_list_set_waiting - Flag all commands in
2510 *         sess_cmd_list to complete cmd_wait_comp.  Set
2511 *         sess_tearing_down so no more commands are queued.
2512 * @se_sess:    session to flag
2513 */
2514void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
2515{
2516        struct se_cmd *se_cmd;
2517        unsigned long flags;
2518
2519        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2520
2521        WARN_ON(se_sess->sess_tearing_down);
2522        se_sess->sess_tearing_down = 1;
2523
2524        list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
2525                se_cmd->cmd_wait_set = 1;
2526
2527        spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2528}
2529EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
2530
2531/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2532 * @se_sess:    session to wait for active I/O
2533 * @wait_for_tasks:     Make extra transport_wait_for_tasks call
2534 */
2535void target_wait_for_sess_cmds(
2536        struct se_session *se_sess,
2537        int wait_for_tasks)
2538{
2539        struct se_cmd *se_cmd, *tmp_cmd;
2540        bool rc = false;
2541
2542        list_for_each_entry_safe(se_cmd, tmp_cmd,
2543                                &se_sess->sess_cmd_list, se_cmd_list) {
2544                list_del(&se_cmd->se_cmd_list);
2545
2546                pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2547                        " %d\n", se_cmd, se_cmd->t_state,
2548                        se_cmd->se_tfo->get_cmd_state(se_cmd));
2549
2550                if (wait_for_tasks) {
2551                        pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
2552                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2553                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2554
2555                        rc = transport_wait_for_tasks(se_cmd);
2556
2557                        pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
2558                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2559                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2560                }
2561
2562                if (!rc) {
2563                        wait_for_completion(&se_cmd->cmd_wait_comp);
2564                        pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2565                                " fabric state: %d\n", se_cmd, se_cmd->t_state,
2566                                se_cmd->se_tfo->get_cmd_state(se_cmd));
2567                }
2568
2569                se_cmd->se_tfo->release_cmd(se_cmd);
2570        }
2571}
2572EXPORT_SYMBOL(target_wait_for_sess_cmds);
2573
2574/*      transport_lun_wait_for_tasks():
2575 *
2576 *      Called from ConfigFS context to stop the passed struct se_cmd to allow
2577 *      an struct se_lun to be successfully shutdown.
2578 */
2579static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
2580{
2581        unsigned long flags;
2582        int ret = 0;
2583
2584        /*
2585         * If the frontend has already requested this struct se_cmd to
2586         * be stopped, we can safely ignore this struct se_cmd.
2587         */
2588        spin_lock_irqsave(&cmd->t_state_lock, flags);
2589        if (cmd->transport_state & CMD_T_STOP) {
2590                cmd->transport_state &= ~CMD_T_LUN_STOP;
2591
2592                pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
2593                         cmd->se_tfo->get_task_tag(cmd));
2594                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2595                transport_cmd_check_stop(cmd, false);
2596                return -EPERM;
2597        }
2598        cmd->transport_state |= CMD_T_LUN_FE_STOP;
2599        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2600
2601        // XXX: audit task_flags checks.
2602        spin_lock_irqsave(&cmd->t_state_lock, flags);
2603        if ((cmd->transport_state & CMD_T_BUSY) &&
2604            (cmd->transport_state & CMD_T_SENT)) {
2605                if (!target_stop_cmd(cmd, &flags))
2606                        ret++;
2607        }
2608        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2609
2610        pr_debug("ConfigFS: cmd: %p stop tasks ret:"
2611                        " %d\n", cmd, ret);
2612        if (!ret) {
2613                pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
2614                                cmd->se_tfo->get_task_tag(cmd));
2615                wait_for_completion(&cmd->transport_lun_stop_comp);
2616                pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
2617                                cmd->se_tfo->get_task_tag(cmd));
2618        }
2619
2620        return 0;
2621}
2622
2623static void __transport_clear_lun_from_sessions(struct se_lun *lun)
2624{
2625        struct se_cmd *cmd = NULL;
2626        unsigned long lun_flags, cmd_flags;
2627        /*
2628         * Do exception processing and return CHECK_CONDITION status to the
2629         * Initiator Port.
2630         */
2631        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2632        while (!list_empty(&lun->lun_cmd_list)) {
2633                cmd = list_first_entry(&lun->lun_cmd_list,
2634                       struct se_cmd, se_lun_node);
2635                list_del_init(&cmd->se_lun_node);
2636
2637                spin_lock(&cmd->t_state_lock);
2638                pr_debug("SE_LUN[%d] - Setting cmd->transport"
2639                        "_lun_stop for  ITT: 0x%08x\n",
2640                        cmd->se_lun->unpacked_lun,
2641                        cmd->se_tfo->get_task_tag(cmd));
2642                cmd->transport_state |= CMD_T_LUN_STOP;
2643                spin_unlock(&cmd->t_state_lock);
2644
2645                spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2646
2647                if (!cmd->se_lun) {
2648                        pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
2649                                cmd->se_tfo->get_task_tag(cmd),
2650                                cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2651                        BUG();
2652                }
2653                /*
2654                 * If the Storage engine still owns the iscsi_cmd_t, determine
2655                 * and/or stop its context.
2656                 */
2657                pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
2658                        "_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
2659                        cmd->se_tfo->get_task_tag(cmd));
2660
2661                if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
2662                        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2663                        continue;
2664                }
2665
2666                pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
2667                        "_wait_for_tasks(): SUCCESS\n",
2668                        cmd->se_lun->unpacked_lun,
2669                        cmd->se_tfo->get_task_tag(cmd));
2670
2671                spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2672                if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
2673                        spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2674                        goto check_cond;
2675                }
2676                cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
2677                target_remove_from_state_list(cmd);
2678                spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2679
2680                /*
2681                 * The Storage engine stopped this struct se_cmd before it was
2682                 * send to the fabric frontend for delivery back to the
2683                 * Initiator Node.  Return this SCSI CDB back with an
2684                 * CHECK_CONDITION status.
2685                 */
2686check_cond:
2687                transport_send_check_condition_and_sense(cmd,
2688                                TCM_NON_EXISTENT_LUN, 0);
2689                /*
2690                 *  If the fabric frontend is waiting for this iscsi_cmd_t to
2691                 * be released, notify the waiting thread now that LU has
2692                 * finished accessing it.
2693                 */
2694                spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
2695                if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
2696                        pr_debug("SE_LUN[%d] - Detected FE stop for"
2697                                " struct se_cmd: %p ITT: 0x%08x\n",
2698                                lun->unpacked_lun,
2699                                cmd, cmd->se_tfo->get_task_tag(cmd));
2700
2701                        spin_unlock_irqrestore(&cmd->t_state_lock,
2702                                        cmd_flags);
2703                        transport_cmd_check_stop(cmd, false);
2704                        complete(&cmd->transport_lun_fe_stop_comp);
2705                        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2706                        continue;
2707                }
2708                pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
2709                        lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
2710
2711                spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
2712                spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
2713        }
2714        spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
2715}
2716
2717static int transport_clear_lun_thread(void *p)
2718{
2719        struct se_lun *lun = p;
2720
2721        __transport_clear_lun_from_sessions(lun);
2722        complete(&lun->lun_shutdown_comp);
2723
2724        return 0;
2725}
2726
2727int transport_clear_lun_from_sessions(struct se_lun *lun)
2728{
2729        struct task_struct *kt;
2730
2731        kt = kthread_run(transport_clear_lun_thread, lun,
2732                        "tcm_cl_%u", lun->unpacked_lun);
2733        if (IS_ERR(kt)) {
2734                pr_err("Unable to start clear_lun thread\n");
2735                return PTR_ERR(kt);
2736        }
2737        wait_for_completion(&lun->lun_shutdown_comp);
2738
2739        return 0;
2740}
2741
2742/**
2743 * transport_wait_for_tasks - wait for completion to occur
2744 * @cmd:        command to wait
2745 *
2746 * Called from frontend fabric context to wait for storage engine
2747 * to pause and/or release frontend generated struct se_cmd.
2748 */
2749bool transport_wait_for_tasks(struct se_cmd *cmd)
2750{
2751        unsigned long flags;
2752
2753        spin_lock_irqsave(&cmd->t_state_lock, flags);
2754        if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2755            !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2756                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2757                return false;
2758        }
2759
2760        if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2761            !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
2762                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2763                return false;
2764        }
2765        /*
2766         * If we are already stopped due to an external event (ie: LUN shutdown)
2767         * sleep until the connection can have the passed struct se_cmd back.
2768         * The cmd->transport_lun_stopped_sem will be upped by
2769         * transport_clear_lun_from_sessions() once the ConfigFS context caller
2770         * has completed its operation on the struct se_cmd.
2771         */
2772        if (cmd->transport_state & CMD_T_LUN_STOP) {
2773                pr_debug("wait_for_tasks: Stopping"
2774                        " wait_for_completion(&cmd->t_tasktransport_lun_fe"
2775                        "_stop_comp); for ITT: 0x%08x\n",
2776                        cmd->se_tfo->get_task_tag(cmd));
2777                /*
2778                 * There is a special case for WRITES where a FE exception +
2779                 * LUN shutdown means ConfigFS context is still sleeping on
2780                 * transport_lun_stop_comp in transport_lun_wait_for_tasks().
2781                 * We go ahead and up transport_lun_stop_comp just to be sure
2782                 * here.
2783                 */
2784                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2785                complete(&cmd->transport_lun_stop_comp);
2786                wait_for_completion(&cmd->transport_lun_fe_stop_comp);
2787                spin_lock_irqsave(&cmd->t_state_lock, flags);
2788
2789                target_remove_from_state_list(cmd);
2790                /*
2791                 * At this point, the frontend who was the originator of this
2792                 * struct se_cmd, now owns the structure and can be released through
2793                 * normal means below.
2794                 */
2795                pr_debug("wait_for_tasks: Stopped"
2796                        " wait_for_completion(&cmd->t_tasktransport_lun_fe_"
2797                        "stop_comp); for ITT: 0x%08x\n",
2798                        cmd->se_tfo->get_task_tag(cmd));
2799
2800                cmd->transport_state &= ~CMD_T_LUN_STOP;
2801        }
2802
2803        if (!(cmd->transport_state & CMD_T_ACTIVE)) {
2804                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2805                return false;
2806        }
2807
2808        cmd->transport_state |= CMD_T_STOP;
2809
2810        pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
2811                " i_state: %d, t_state: %d, CMD_T_STOP\n",
2812                cmd, cmd->se_tfo->get_task_tag(cmd),
2813                cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
2814
2815        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2816
2817        wait_for_completion(&cmd->t_transport_stop_comp);
2818
2819        spin_lock_irqsave(&cmd->t_state_lock, flags);
2820        cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
2821
2822        pr_debug("wait_for_tasks: Stopped wait_for_completion("
2823                "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
2824                cmd->se_tfo->get_task_tag(cmd));
2825
2826        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2827
2828        return true;
2829}
2830EXPORT_SYMBOL(transport_wait_for_tasks);
2831
2832static int transport_get_sense_codes(
2833        struct se_cmd *cmd,
2834        u8 *asc,
2835        u8 *ascq)
2836{
2837        *asc = cmd->scsi_asc;
2838        *ascq = cmd->scsi_ascq;
2839
2840        return 0;
2841}
2842
2843static int transport_set_sense_codes(
2844        struct se_cmd *cmd,
2845        u8 asc,
2846        u8 ascq)
2847{
2848        cmd->scsi_asc = asc;
2849        cmd->scsi_ascq = ascq;
2850
2851        return 0;
2852}
2853
2854int transport_send_check_condition_and_sense(
2855        struct se_cmd *cmd,
2856        u8 reason,
2857        int from_transport)
2858{
2859        unsigned char *buffer = cmd->sense_buffer;
2860        unsigned long flags;
2861        u8 asc = 0, ascq = 0;
2862
2863        spin_lock_irqsave(&cmd->t_state_lock, flags);
2864        if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
2865                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2866                return 0;
2867        }
2868        cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
2869        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2870
2871        if (!reason && from_transport)
2872                goto after_reason;
2873
2874        if (!from_transport)
2875                cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
2876
2877        /*
2878         * Actual SENSE DATA, see SPC-3 7.23.2  SPC_SENSE_KEY_OFFSET uses
2879         * SENSE KEY values from include/scsi/scsi.h
2880         */
2881        switch (reason) {
2882        case TCM_NON_EXISTENT_LUN:
2883                /* CURRENT ERROR */
2884                buffer[0] = 0x70;
2885                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2886                /* ILLEGAL REQUEST */
2887                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2888                /* LOGICAL UNIT NOT SUPPORTED */
2889                buffer[SPC_ASC_KEY_OFFSET] = 0x25;
2890                break;
2891        case TCM_UNSUPPORTED_SCSI_OPCODE:
2892        case TCM_SECTOR_COUNT_TOO_MANY:
2893                /* CURRENT ERROR */
2894                buffer[0] = 0x70;
2895                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2896                /* ILLEGAL REQUEST */
2897                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2898                /* INVALID COMMAND OPERATION CODE */
2899                buffer[SPC_ASC_KEY_OFFSET] = 0x20;
2900                break;
2901        case TCM_UNKNOWN_MODE_PAGE:
2902                /* CURRENT ERROR */
2903                buffer[0] = 0x70;
2904                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2905                /* ILLEGAL REQUEST */
2906                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2907                /* INVALID FIELD IN CDB */
2908                buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2909                break;
2910        case TCM_CHECK_CONDITION_ABORT_CMD:
2911                /* CURRENT ERROR */
2912                buffer[0] = 0x70;
2913                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2914                /* ABORTED COMMAND */
2915                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2916                /* BUS DEVICE RESET FUNCTION OCCURRED */
2917                buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2918                buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
2919                break;
2920        case TCM_INCORRECT_AMOUNT_OF_DATA:
2921                /* CURRENT ERROR */
2922                buffer[0] = 0x70;
2923                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2924                /* ABORTED COMMAND */
2925                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2926                /* WRITE ERROR */
2927                buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2928                /* NOT ENOUGH UNSOLICITED DATA */
2929                buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
2930                break;
2931        case TCM_INVALID_CDB_FIELD:
2932                /* CURRENT ERROR */
2933                buffer[0] = 0x70;
2934                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2935                /* ILLEGAL REQUEST */
2936                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2937                /* INVALID FIELD IN CDB */
2938                buffer[SPC_ASC_KEY_OFFSET] = 0x24;
2939                break;
2940        case TCM_INVALID_PARAMETER_LIST:
2941                /* CURRENT ERROR */
2942                buffer[0] = 0x70;
2943                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2944                /* ILLEGAL REQUEST */
2945                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2946                /* INVALID FIELD IN PARAMETER LIST */
2947                buffer[SPC_ASC_KEY_OFFSET] = 0x26;
2948                break;
2949        case TCM_UNEXPECTED_UNSOLICITED_DATA:
2950                /* CURRENT ERROR */
2951                buffer[0] = 0x70;
2952                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2953                /* ABORTED COMMAND */
2954                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2955                /* WRITE ERROR */
2956                buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
2957                /* UNEXPECTED_UNSOLICITED_DATA */
2958                buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
2959                break;
2960        case TCM_SERVICE_CRC_ERROR:
2961                /* CURRENT ERROR */
2962                buffer[0] = 0x70;
2963                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2964                /* ABORTED COMMAND */
2965                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2966                /* PROTOCOL SERVICE CRC ERROR */
2967                buffer[SPC_ASC_KEY_OFFSET] = 0x47;
2968                /* N/A */
2969                buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
2970                break;
2971        case TCM_SNACK_REJECTED:
2972                /* CURRENT ERROR */
2973                buffer[0] = 0x70;
2974                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2975                /* ABORTED COMMAND */
2976                buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
2977                /* READ ERROR */
2978                buffer[SPC_ASC_KEY_OFFSET] = 0x11;
2979                /* FAILED RETRANSMISSION REQUEST */
2980                buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
2981                break;
2982        case TCM_WRITE_PROTECTED:
2983                /* CURRENT ERROR */
2984                buffer[0] = 0x70;
2985                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2986                /* DATA PROTECT */
2987                buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
2988                /* WRITE PROTECTED */
2989                buffer[SPC_ASC_KEY_OFFSET] = 0x27;
2990                break;
2991        case TCM_ADDRESS_OUT_OF_RANGE:
2992                /* CURRENT ERROR */
2993                buffer[0] = 0x70;
2994                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2995                /* ILLEGAL REQUEST */
2996                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2997                /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
2998                buffer[SPC_ASC_KEY_OFFSET] = 0x21;
2999                break;
3000        case TCM_CHECK_CONDITION_UNIT_ATTENTION:
3001                /* CURRENT ERROR */
3002                buffer[0] = 0x70;
3003                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3004                /* UNIT ATTENTION */
3005                buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
3006                core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
3007                buffer[SPC_ASC_KEY_OFFSET] = asc;
3008                buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3009                break;
3010        case TCM_CHECK_CONDITION_NOT_READY:
3011                /* CURRENT ERROR */
3012                buffer[0] = 0x70;
3013                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3014                /* Not Ready */
3015                buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
3016                transport_get_sense_codes(cmd, &asc, &ascq);
3017                buffer[SPC_ASC_KEY_OFFSET] = asc;
3018                buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
3019                break;
3020        case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
3021        default:
3022                /* CURRENT ERROR */
3023                buffer[0] = 0x70;
3024                buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
3025                /* ILLEGAL REQUEST */
3026                buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
3027                /* LOGICAL UNIT COMMUNICATION FAILURE */
3028                buffer[SPC_ASC_KEY_OFFSET] = 0x08;
3029                break;
3030        }
3031        /*
3032         * This code uses linux/include/scsi/scsi.h SAM status codes!
3033         */
3034        cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
3035        /*
3036         * Automatically padded, this value is encoded in the fabric's
3037         * data_length response PDU containing the SCSI defined sense data.
3038         */
3039        cmd->scsi_sense_length  = TRANSPORT_SENSE_BUFFER;
3040
3041after_reason:
3042        return cmd->se_tfo->queue_status(cmd);
3043}
3044EXPORT_SYMBOL(transport_send_check_condition_and_sense);
3045
3046int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
3047{
3048        int ret = 0;
3049
3050        if (cmd->transport_state & CMD_T_ABORTED) {
3051                if (!send_status ||
3052                     (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
3053                        return 1;
3054
3055                pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
3056                        " status for CDB: 0x%02x ITT: 0x%08x\n",
3057                        cmd->t_task_cdb[0],
3058                        cmd->se_tfo->get_task_tag(cmd));
3059
3060                cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
3061                cmd->se_tfo->queue_status(cmd);
3062                ret = 1;
3063        }
3064        return ret;
3065}
3066EXPORT_SYMBOL(transport_check_aborted_status);
3067
3068void transport_send_task_abort(struct se_cmd *cmd)
3069{
3070        unsigned long flags;
3071
3072        spin_lock_irqsave(&cmd->t_state_lock, flags);
3073        if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION | SCF_SENT_DELAYED_TAS)) {
3074                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3075                return;
3076        }
3077        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3078
3079        /*
3080         * If there are still expected incoming fabric WRITEs, we wait
3081         * until until they have completed before sending a TASK_ABORTED
3082         * response.  This response with TASK_ABORTED status will be
3083         * queued back to fabric module by transport_check_aborted_status().
3084         */
3085        if (cmd->data_direction == DMA_TO_DEVICE) {
3086                if (cmd->se_tfo->write_pending_status(cmd) != 0) {
3087                        cmd->transport_state |= CMD_T_ABORTED;
3088                        smp_mb__after_atomic_inc();
3089                }
3090        }
3091        cmd->scsi_status = SAM_STAT_TASK_ABORTED;
3092
3093        transport_lun_remove_cmd(cmd);
3094
3095        pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
3096                " ITT: 0x%08x\n", cmd->t_task_cdb[0],
3097                cmd->se_tfo->get_task_tag(cmd));
3098
3099        cmd->se_tfo->queue_status(cmd);
3100}
3101
3102static void target_tmr_work(struct work_struct *work)
3103{
3104        struct se_cmd *cmd = container_of(work, struct se_cmd, work);
3105        struct se_device *dev = cmd->se_dev;
3106        struct se_tmr_req *tmr = cmd->se_tmr_req;
3107        int ret;
3108
3109        switch (tmr->function) {
3110        case TMR_ABORT_TASK:
3111                core_tmr_abort_task(dev, tmr, cmd->se_sess);
3112                break;
3113        case TMR_ABORT_TASK_SET:
3114        case TMR_CLEAR_ACA:
3115        case TMR_CLEAR_TASK_SET:
3116                tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3117                break;
3118        case TMR_LUN_RESET:
3119                ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3120                tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3121                                         TMR_FUNCTION_REJECTED;
3122                break;
3123        case TMR_TARGET_WARM_RESET:
3124                tmr->response = TMR_FUNCTION_REJECTED;
3125                break;
3126        case TMR_TARGET_COLD_RESET:
3127                tmr->response = TMR_FUNCTION_REJECTED;
3128                break;
3129        default:
3130                pr_err("Uknown TMR function: 0x%02x.\n",
3131                                tmr->function);
3132                tmr->response = TMR_FUNCTION_REJECTED;
3133                break;
3134        }
3135
3136        cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
3137        cmd->se_tfo->queue_tm_rsp(cmd);
3138
3139        transport_cmd_check_stop_to_fabric(cmd);
3140}
3141
3142int transport_generic_handle_tmr(
3143        struct se_cmd *cmd)
3144{
3145        INIT_WORK(&cmd->work, target_tmr_work);
3146        queue_work(cmd->se_dev->tmr_wq, &cmd->work);
3147        return 0;
3148}
3149EXPORT_SYMBOL(transport_generic_handle_tmr);
3150
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